1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Linux Socket Filter - Kernel level socket filtering 4 * 5 * Based on the design of the Berkeley Packet Filter. The new 6 * internal format has been designed by PLUMgrid: 7 * 8 * Copyright (c) 2011 - 2014 PLUMgrid, http://plumgrid.com 9 * 10 * Authors: 11 * 12 * Jay Schulist <jschlst@samba.org> 13 * Alexei Starovoitov <ast@plumgrid.com> 14 * Daniel Borkmann <dborkman@redhat.com> 15 * 16 * Andi Kleen - Fix a few bad bugs and races. 17 * Kris Katterjohn - Added many additional checks in bpf_check_classic() 18 */ 19 20 #include <linux/atomic.h> 21 #include <linux/bpf_verifier.h> 22 #include <linux/module.h> 23 #include <linux/types.h> 24 #include <linux/mm.h> 25 #include <linux/fcntl.h> 26 #include <linux/socket.h> 27 #include <linux/sock_diag.h> 28 #include <linux/in.h> 29 #include <linux/inet.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_packet.h> 32 #include <linux/if_arp.h> 33 #include <linux/gfp.h> 34 #include <net/inet_common.h> 35 #include <net/ip.h> 36 #include <net/protocol.h> 37 #include <net/netlink.h> 38 #include <linux/skbuff.h> 39 #include <linux/skmsg.h> 40 #include <net/sock.h> 41 #include <net/flow_dissector.h> 42 #include <linux/errno.h> 43 #include <linux/timer.h> 44 #include <linux/uaccess.h> 45 #include <asm/unaligned.h> 46 #include <linux/filter.h> 47 #include <linux/ratelimit.h> 48 #include <linux/seccomp.h> 49 #include <linux/if_vlan.h> 50 #include <linux/bpf.h> 51 #include <linux/btf.h> 52 #include <net/sch_generic.h> 53 #include <net/cls_cgroup.h> 54 #include <net/dst_metadata.h> 55 #include <net/dst.h> 56 #include <net/sock_reuseport.h> 57 #include <net/busy_poll.h> 58 #include <net/tcp.h> 59 #include <net/xfrm.h> 60 #include <net/udp.h> 61 #include <linux/bpf_trace.h> 62 #include <net/xdp_sock.h> 63 #include <linux/inetdevice.h> 64 #include <net/inet_hashtables.h> 65 #include <net/inet6_hashtables.h> 66 #include <net/ip_fib.h> 67 #include <net/nexthop.h> 68 #include <net/flow.h> 69 #include <net/arp.h> 70 #include <net/ipv6.h> 71 #include <net/net_namespace.h> 72 #include <linux/seg6_local.h> 73 #include <net/seg6.h> 74 #include <net/seg6_local.h> 75 #include <net/lwtunnel.h> 76 #include <net/ipv6_stubs.h> 77 #include <net/bpf_sk_storage.h> 78 #include <net/transp_v6.h> 79 #include <linux/btf_ids.h> 80 #include <net/tls.h> 81 #include <net/xdp.h> 82 #include <net/mptcp.h> 83 #include <net/netfilter/nf_conntrack_bpf.h> 84 #include <net/netkit.h> 85 #include <linux/un.h> 86 #include <net/xdp_sock_drv.h> 87 88 #include "dev.h" 89 90 static const struct bpf_func_proto * 91 bpf_sk_base_func_proto(enum bpf_func_id func_id); 92 93 int copy_bpf_fprog_from_user(struct sock_fprog *dst, sockptr_t src, int len) 94 { 95 if (in_compat_syscall()) { 96 struct compat_sock_fprog f32; 97 98 if (len != sizeof(f32)) 99 return -EINVAL; 100 if (copy_from_sockptr(&f32, src, sizeof(f32))) 101 return -EFAULT; 102 memset(dst, 0, sizeof(*dst)); 103 dst->len = f32.len; 104 dst->filter = compat_ptr(f32.filter); 105 } else { 106 if (len != sizeof(*dst)) 107 return -EINVAL; 108 if (copy_from_sockptr(dst, src, sizeof(*dst))) 109 return -EFAULT; 110 } 111 112 return 0; 113 } 114 EXPORT_SYMBOL_GPL(copy_bpf_fprog_from_user); 115 116 /** 117 * sk_filter_trim_cap - run a packet through a socket filter 118 * @sk: sock associated with &sk_buff 119 * @skb: buffer to filter 120 * @cap: limit on how short the eBPF program may trim the packet 121 * 122 * Run the eBPF program and then cut skb->data to correct size returned by 123 * the program. If pkt_len is 0 we toss packet. If skb->len is smaller 124 * than pkt_len we keep whole skb->data. This is the socket level 125 * wrapper to bpf_prog_run. It returns 0 if the packet should 126 * be accepted or -EPERM if the packet should be tossed. 127 * 128 */ 129 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap) 130 { 131 int err; 132 struct sk_filter *filter; 133 134 /* 135 * If the skb was allocated from pfmemalloc reserves, only 136 * allow SOCK_MEMALLOC sockets to use it as this socket is 137 * helping free memory 138 */ 139 if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) { 140 NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP); 141 return -ENOMEM; 142 } 143 err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb); 144 if (err) 145 return err; 146 147 err = security_sock_rcv_skb(sk, skb); 148 if (err) 149 return err; 150 151 rcu_read_lock(); 152 filter = rcu_dereference(sk->sk_filter); 153 if (filter) { 154 struct sock *save_sk = skb->sk; 155 unsigned int pkt_len; 156 157 skb->sk = sk; 158 pkt_len = bpf_prog_run_save_cb(filter->prog, skb); 159 skb->sk = save_sk; 160 err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM; 161 } 162 rcu_read_unlock(); 163 164 return err; 165 } 166 EXPORT_SYMBOL(sk_filter_trim_cap); 167 168 BPF_CALL_1(bpf_skb_get_pay_offset, struct sk_buff *, skb) 169 { 170 return skb_get_poff(skb); 171 } 172 173 BPF_CALL_3(bpf_skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x) 174 { 175 struct nlattr *nla; 176 177 if (skb_is_nonlinear(skb)) 178 return 0; 179 180 if (skb->len < sizeof(struct nlattr)) 181 return 0; 182 183 if (a > skb->len - sizeof(struct nlattr)) 184 return 0; 185 186 nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x); 187 if (nla) 188 return (void *) nla - (void *) skb->data; 189 190 return 0; 191 } 192 193 BPF_CALL_3(bpf_skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x) 194 { 195 struct nlattr *nla; 196 197 if (skb_is_nonlinear(skb)) 198 return 0; 199 200 if (skb->len < sizeof(struct nlattr)) 201 return 0; 202 203 if (a > skb->len - sizeof(struct nlattr)) 204 return 0; 205 206 nla = (struct nlattr *) &skb->data[a]; 207 if (!nla_ok(nla, skb->len - a)) 208 return 0; 209 210 nla = nla_find_nested(nla, x); 211 if (nla) 212 return (void *) nla - (void *) skb->data; 213 214 return 0; 215 } 216 217 BPF_CALL_4(bpf_skb_load_helper_8, const struct sk_buff *, skb, const void *, 218 data, int, headlen, int, offset) 219 { 220 u8 tmp, *ptr; 221 const int len = sizeof(tmp); 222 223 if (offset >= 0) { 224 if (headlen - offset >= len) 225 return *(u8 *)(data + offset); 226 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 227 return tmp; 228 } else { 229 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 230 if (likely(ptr)) 231 return *(u8 *)ptr; 232 } 233 234 return -EFAULT; 235 } 236 237 BPF_CALL_2(bpf_skb_load_helper_8_no_cache, const struct sk_buff *, skb, 238 int, offset) 239 { 240 return ____bpf_skb_load_helper_8(skb, skb->data, skb->len - skb->data_len, 241 offset); 242 } 243 244 BPF_CALL_4(bpf_skb_load_helper_16, const struct sk_buff *, skb, const void *, 245 data, int, headlen, int, offset) 246 { 247 __be16 tmp, *ptr; 248 const int len = sizeof(tmp); 249 250 if (offset >= 0) { 251 if (headlen - offset >= len) 252 return get_unaligned_be16(data + offset); 253 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 254 return be16_to_cpu(tmp); 255 } else { 256 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 257 if (likely(ptr)) 258 return get_unaligned_be16(ptr); 259 } 260 261 return -EFAULT; 262 } 263 264 BPF_CALL_2(bpf_skb_load_helper_16_no_cache, const struct sk_buff *, skb, 265 int, offset) 266 { 267 return ____bpf_skb_load_helper_16(skb, skb->data, skb->len - skb->data_len, 268 offset); 269 } 270 271 BPF_CALL_4(bpf_skb_load_helper_32, const struct sk_buff *, skb, const void *, 272 data, int, headlen, int, offset) 273 { 274 __be32 tmp, *ptr; 275 const int len = sizeof(tmp); 276 277 if (likely(offset >= 0)) { 278 if (headlen - offset >= len) 279 return get_unaligned_be32(data + offset); 280 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 281 return be32_to_cpu(tmp); 282 } else { 283 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 284 if (likely(ptr)) 285 return get_unaligned_be32(ptr); 286 } 287 288 return -EFAULT; 289 } 290 291 BPF_CALL_2(bpf_skb_load_helper_32_no_cache, const struct sk_buff *, skb, 292 int, offset) 293 { 294 return ____bpf_skb_load_helper_32(skb, skb->data, skb->len - skb->data_len, 295 offset); 296 } 297 298 static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg, 299 struct bpf_insn *insn_buf) 300 { 301 struct bpf_insn *insn = insn_buf; 302 303 switch (skb_field) { 304 case SKF_AD_MARK: 305 BUILD_BUG_ON(sizeof_field(struct sk_buff, mark) != 4); 306 307 *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg, 308 offsetof(struct sk_buff, mark)); 309 break; 310 311 case SKF_AD_PKTTYPE: 312 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET); 313 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX); 314 #ifdef __BIG_ENDIAN_BITFIELD 315 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5); 316 #endif 317 break; 318 319 case SKF_AD_QUEUE: 320 BUILD_BUG_ON(sizeof_field(struct sk_buff, queue_mapping) != 2); 321 322 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, 323 offsetof(struct sk_buff, queue_mapping)); 324 break; 325 326 case SKF_AD_VLAN_TAG: 327 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_tci) != 2); 328 329 /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */ 330 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, 331 offsetof(struct sk_buff, vlan_tci)); 332 break; 333 case SKF_AD_VLAN_TAG_PRESENT: 334 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_all) != 4); 335 *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg, 336 offsetof(struct sk_buff, vlan_all)); 337 *insn++ = BPF_JMP_IMM(BPF_JEQ, dst_reg, 0, 1); 338 *insn++ = BPF_ALU32_IMM(BPF_MOV, dst_reg, 1); 339 break; 340 } 341 342 return insn - insn_buf; 343 } 344 345 static bool convert_bpf_extensions(struct sock_filter *fp, 346 struct bpf_insn **insnp) 347 { 348 struct bpf_insn *insn = *insnp; 349 u32 cnt; 350 351 switch (fp->k) { 352 case SKF_AD_OFF + SKF_AD_PROTOCOL: 353 BUILD_BUG_ON(sizeof_field(struct sk_buff, protocol) != 2); 354 355 /* A = *(u16 *) (CTX + offsetof(protocol)) */ 356 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, 357 offsetof(struct sk_buff, protocol)); 358 /* A = ntohs(A) [emitting a nop or swap16] */ 359 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); 360 break; 361 362 case SKF_AD_OFF + SKF_AD_PKTTYPE: 363 cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn); 364 insn += cnt - 1; 365 break; 366 367 case SKF_AD_OFF + SKF_AD_IFINDEX: 368 case SKF_AD_OFF + SKF_AD_HATYPE: 369 BUILD_BUG_ON(sizeof_field(struct net_device, ifindex) != 4); 370 BUILD_BUG_ON(sizeof_field(struct net_device, type) != 2); 371 372 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 373 BPF_REG_TMP, BPF_REG_CTX, 374 offsetof(struct sk_buff, dev)); 375 /* if (tmp != 0) goto pc + 1 */ 376 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1); 377 *insn++ = BPF_EXIT_INSN(); 378 if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX) 379 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP, 380 offsetof(struct net_device, ifindex)); 381 else 382 *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP, 383 offsetof(struct net_device, type)); 384 break; 385 386 case SKF_AD_OFF + SKF_AD_MARK: 387 cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn); 388 insn += cnt - 1; 389 break; 390 391 case SKF_AD_OFF + SKF_AD_RXHASH: 392 BUILD_BUG_ON(sizeof_field(struct sk_buff, hash) != 4); 393 394 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, 395 offsetof(struct sk_buff, hash)); 396 break; 397 398 case SKF_AD_OFF + SKF_AD_QUEUE: 399 cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn); 400 insn += cnt - 1; 401 break; 402 403 case SKF_AD_OFF + SKF_AD_VLAN_TAG: 404 cnt = convert_skb_access(SKF_AD_VLAN_TAG, 405 BPF_REG_A, BPF_REG_CTX, insn); 406 insn += cnt - 1; 407 break; 408 409 case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT: 410 cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT, 411 BPF_REG_A, BPF_REG_CTX, insn); 412 insn += cnt - 1; 413 break; 414 415 case SKF_AD_OFF + SKF_AD_VLAN_TPID: 416 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_proto) != 2); 417 418 /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */ 419 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, 420 offsetof(struct sk_buff, vlan_proto)); 421 /* A = ntohs(A) [emitting a nop or swap16] */ 422 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); 423 break; 424 425 case SKF_AD_OFF + SKF_AD_PAY_OFFSET: 426 case SKF_AD_OFF + SKF_AD_NLATTR: 427 case SKF_AD_OFF + SKF_AD_NLATTR_NEST: 428 case SKF_AD_OFF + SKF_AD_CPU: 429 case SKF_AD_OFF + SKF_AD_RANDOM: 430 /* arg1 = CTX */ 431 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); 432 /* arg2 = A */ 433 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A); 434 /* arg3 = X */ 435 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X); 436 /* Emit call(arg1=CTX, arg2=A, arg3=X) */ 437 switch (fp->k) { 438 case SKF_AD_OFF + SKF_AD_PAY_OFFSET: 439 *insn = BPF_EMIT_CALL(bpf_skb_get_pay_offset); 440 break; 441 case SKF_AD_OFF + SKF_AD_NLATTR: 442 *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr); 443 break; 444 case SKF_AD_OFF + SKF_AD_NLATTR_NEST: 445 *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr_nest); 446 break; 447 case SKF_AD_OFF + SKF_AD_CPU: 448 *insn = BPF_EMIT_CALL(bpf_get_raw_cpu_id); 449 break; 450 case SKF_AD_OFF + SKF_AD_RANDOM: 451 *insn = BPF_EMIT_CALL(bpf_user_rnd_u32); 452 bpf_user_rnd_init_once(); 453 break; 454 } 455 break; 456 457 case SKF_AD_OFF + SKF_AD_ALU_XOR_X: 458 /* A ^= X */ 459 *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X); 460 break; 461 462 default: 463 /* This is just a dummy call to avoid letting the compiler 464 * evict __bpf_call_base() as an optimization. Placed here 465 * where no-one bothers. 466 */ 467 BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0); 468 return false; 469 } 470 471 *insnp = insn; 472 return true; 473 } 474 475 static bool convert_bpf_ld_abs(struct sock_filter *fp, struct bpf_insn **insnp) 476 { 477 const bool unaligned_ok = IS_BUILTIN(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS); 478 int size = bpf_size_to_bytes(BPF_SIZE(fp->code)); 479 bool endian = BPF_SIZE(fp->code) == BPF_H || 480 BPF_SIZE(fp->code) == BPF_W; 481 bool indirect = BPF_MODE(fp->code) == BPF_IND; 482 const int ip_align = NET_IP_ALIGN; 483 struct bpf_insn *insn = *insnp; 484 int offset = fp->k; 485 486 if (!indirect && 487 ((unaligned_ok && offset >= 0) || 488 (!unaligned_ok && offset >= 0 && 489 offset + ip_align >= 0 && 490 offset + ip_align % size == 0))) { 491 bool ldx_off_ok = offset <= S16_MAX; 492 493 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_H); 494 if (offset) 495 *insn++ = BPF_ALU64_IMM(BPF_SUB, BPF_REG_TMP, offset); 496 *insn++ = BPF_JMP_IMM(BPF_JSLT, BPF_REG_TMP, 497 size, 2 + endian + (!ldx_off_ok * 2)); 498 if (ldx_off_ok) { 499 *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, 500 BPF_REG_D, offset); 501 } else { 502 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_D); 503 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_TMP, offset); 504 *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, 505 BPF_REG_TMP, 0); 506 } 507 if (endian) 508 *insn++ = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, size * 8); 509 *insn++ = BPF_JMP_A(8); 510 } 511 512 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); 513 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_D); 514 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_H); 515 if (!indirect) { 516 *insn++ = BPF_MOV64_IMM(BPF_REG_ARG4, offset); 517 } else { 518 *insn++ = BPF_MOV64_REG(BPF_REG_ARG4, BPF_REG_X); 519 if (fp->k) 520 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_ARG4, offset); 521 } 522 523 switch (BPF_SIZE(fp->code)) { 524 case BPF_B: 525 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8); 526 break; 527 case BPF_H: 528 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16); 529 break; 530 case BPF_W: 531 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32); 532 break; 533 default: 534 return false; 535 } 536 537 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_A, 0, 2); 538 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 539 *insn = BPF_EXIT_INSN(); 540 541 *insnp = insn; 542 return true; 543 } 544 545 /** 546 * bpf_convert_filter - convert filter program 547 * @prog: the user passed filter program 548 * @len: the length of the user passed filter program 549 * @new_prog: allocated 'struct bpf_prog' or NULL 550 * @new_len: pointer to store length of converted program 551 * @seen_ld_abs: bool whether we've seen ld_abs/ind 552 * 553 * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn' 554 * style extended BPF (eBPF). 555 * Conversion workflow: 556 * 557 * 1) First pass for calculating the new program length: 558 * bpf_convert_filter(old_prog, old_len, NULL, &new_len, &seen_ld_abs) 559 * 560 * 2) 2nd pass to remap in two passes: 1st pass finds new 561 * jump offsets, 2nd pass remapping: 562 * bpf_convert_filter(old_prog, old_len, new_prog, &new_len, &seen_ld_abs) 563 */ 564 static int bpf_convert_filter(struct sock_filter *prog, int len, 565 struct bpf_prog *new_prog, int *new_len, 566 bool *seen_ld_abs) 567 { 568 int new_flen = 0, pass = 0, target, i, stack_off; 569 struct bpf_insn *new_insn, *first_insn = NULL; 570 struct sock_filter *fp; 571 int *addrs = NULL; 572 u8 bpf_src; 573 574 BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK); 575 BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG); 576 577 if (len <= 0 || len > BPF_MAXINSNS) 578 return -EINVAL; 579 580 if (new_prog) { 581 first_insn = new_prog->insnsi; 582 addrs = kcalloc(len, sizeof(*addrs), 583 GFP_KERNEL | __GFP_NOWARN); 584 if (!addrs) 585 return -ENOMEM; 586 } 587 588 do_pass: 589 new_insn = first_insn; 590 fp = prog; 591 592 /* Classic BPF related prologue emission. */ 593 if (new_prog) { 594 /* Classic BPF expects A and X to be reset first. These need 595 * to be guaranteed to be the first two instructions. 596 */ 597 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 598 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_X, BPF_REG_X); 599 600 /* All programs must keep CTX in callee saved BPF_REG_CTX. 601 * In eBPF case it's done by the compiler, here we need to 602 * do this ourself. Initial CTX is present in BPF_REG_ARG1. 603 */ 604 *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1); 605 if (*seen_ld_abs) { 606 /* For packet access in classic BPF, cache skb->data 607 * in callee-saved BPF R8 and skb->len - skb->data_len 608 * (headlen) in BPF R9. Since classic BPF is read-only 609 * on CTX, we only need to cache it once. 610 */ 611 *new_insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 612 BPF_REG_D, BPF_REG_CTX, 613 offsetof(struct sk_buff, data)); 614 *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_H, BPF_REG_CTX, 615 offsetof(struct sk_buff, len)); 616 *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_TMP, BPF_REG_CTX, 617 offsetof(struct sk_buff, data_len)); 618 *new_insn++ = BPF_ALU32_REG(BPF_SUB, BPF_REG_H, BPF_REG_TMP); 619 } 620 } else { 621 new_insn += 3; 622 } 623 624 for (i = 0; i < len; fp++, i++) { 625 struct bpf_insn tmp_insns[32] = { }; 626 struct bpf_insn *insn = tmp_insns; 627 628 if (addrs) 629 addrs[i] = new_insn - first_insn; 630 631 switch (fp->code) { 632 /* All arithmetic insns and skb loads map as-is. */ 633 case BPF_ALU | BPF_ADD | BPF_X: 634 case BPF_ALU | BPF_ADD | BPF_K: 635 case BPF_ALU | BPF_SUB | BPF_X: 636 case BPF_ALU | BPF_SUB | BPF_K: 637 case BPF_ALU | BPF_AND | BPF_X: 638 case BPF_ALU | BPF_AND | BPF_K: 639 case BPF_ALU | BPF_OR | BPF_X: 640 case BPF_ALU | BPF_OR | BPF_K: 641 case BPF_ALU | BPF_LSH | BPF_X: 642 case BPF_ALU | BPF_LSH | BPF_K: 643 case BPF_ALU | BPF_RSH | BPF_X: 644 case BPF_ALU | BPF_RSH | BPF_K: 645 case BPF_ALU | BPF_XOR | BPF_X: 646 case BPF_ALU | BPF_XOR | BPF_K: 647 case BPF_ALU | BPF_MUL | BPF_X: 648 case BPF_ALU | BPF_MUL | BPF_K: 649 case BPF_ALU | BPF_DIV | BPF_X: 650 case BPF_ALU | BPF_DIV | BPF_K: 651 case BPF_ALU | BPF_MOD | BPF_X: 652 case BPF_ALU | BPF_MOD | BPF_K: 653 case BPF_ALU | BPF_NEG: 654 case BPF_LD | BPF_ABS | BPF_W: 655 case BPF_LD | BPF_ABS | BPF_H: 656 case BPF_LD | BPF_ABS | BPF_B: 657 case BPF_LD | BPF_IND | BPF_W: 658 case BPF_LD | BPF_IND | BPF_H: 659 case BPF_LD | BPF_IND | BPF_B: 660 /* Check for overloaded BPF extension and 661 * directly convert it if found, otherwise 662 * just move on with mapping. 663 */ 664 if (BPF_CLASS(fp->code) == BPF_LD && 665 BPF_MODE(fp->code) == BPF_ABS && 666 convert_bpf_extensions(fp, &insn)) 667 break; 668 if (BPF_CLASS(fp->code) == BPF_LD && 669 convert_bpf_ld_abs(fp, &insn)) { 670 *seen_ld_abs = true; 671 break; 672 } 673 674 if (fp->code == (BPF_ALU | BPF_DIV | BPF_X) || 675 fp->code == (BPF_ALU | BPF_MOD | BPF_X)) { 676 *insn++ = BPF_MOV32_REG(BPF_REG_X, BPF_REG_X); 677 /* Error with exception code on div/mod by 0. 678 * For cBPF programs, this was always return 0. 679 */ 680 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_X, 0, 2); 681 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 682 *insn++ = BPF_EXIT_INSN(); 683 } 684 685 *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k); 686 break; 687 688 /* Jump transformation cannot use BPF block macros 689 * everywhere as offset calculation and target updates 690 * require a bit more work than the rest, i.e. jump 691 * opcodes map as-is, but offsets need adjustment. 692 */ 693 694 #define BPF_EMIT_JMP \ 695 do { \ 696 const s32 off_min = S16_MIN, off_max = S16_MAX; \ 697 s32 off; \ 698 \ 699 if (target >= len || target < 0) \ 700 goto err; \ 701 off = addrs ? addrs[target] - addrs[i] - 1 : 0; \ 702 /* Adjust pc relative offset for 2nd or 3rd insn. */ \ 703 off -= insn - tmp_insns; \ 704 /* Reject anything not fitting into insn->off. */ \ 705 if (off < off_min || off > off_max) \ 706 goto err; \ 707 insn->off = off; \ 708 } while (0) 709 710 case BPF_JMP | BPF_JA: 711 target = i + fp->k + 1; 712 insn->code = fp->code; 713 BPF_EMIT_JMP; 714 break; 715 716 case BPF_JMP | BPF_JEQ | BPF_K: 717 case BPF_JMP | BPF_JEQ | BPF_X: 718 case BPF_JMP | BPF_JSET | BPF_K: 719 case BPF_JMP | BPF_JSET | BPF_X: 720 case BPF_JMP | BPF_JGT | BPF_K: 721 case BPF_JMP | BPF_JGT | BPF_X: 722 case BPF_JMP | BPF_JGE | BPF_K: 723 case BPF_JMP | BPF_JGE | BPF_X: 724 if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) { 725 /* BPF immediates are signed, zero extend 726 * immediate into tmp register and use it 727 * in compare insn. 728 */ 729 *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k); 730 731 insn->dst_reg = BPF_REG_A; 732 insn->src_reg = BPF_REG_TMP; 733 bpf_src = BPF_X; 734 } else { 735 insn->dst_reg = BPF_REG_A; 736 insn->imm = fp->k; 737 bpf_src = BPF_SRC(fp->code); 738 insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0; 739 } 740 741 /* Common case where 'jump_false' is next insn. */ 742 if (fp->jf == 0) { 743 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; 744 target = i + fp->jt + 1; 745 BPF_EMIT_JMP; 746 break; 747 } 748 749 /* Convert some jumps when 'jump_true' is next insn. */ 750 if (fp->jt == 0) { 751 switch (BPF_OP(fp->code)) { 752 case BPF_JEQ: 753 insn->code = BPF_JMP | BPF_JNE | bpf_src; 754 break; 755 case BPF_JGT: 756 insn->code = BPF_JMP | BPF_JLE | bpf_src; 757 break; 758 case BPF_JGE: 759 insn->code = BPF_JMP | BPF_JLT | bpf_src; 760 break; 761 default: 762 goto jmp_rest; 763 } 764 765 target = i + fp->jf + 1; 766 BPF_EMIT_JMP; 767 break; 768 } 769 jmp_rest: 770 /* Other jumps are mapped into two insns: Jxx and JA. */ 771 target = i + fp->jt + 1; 772 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; 773 BPF_EMIT_JMP; 774 insn++; 775 776 insn->code = BPF_JMP | BPF_JA; 777 target = i + fp->jf + 1; 778 BPF_EMIT_JMP; 779 break; 780 781 /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */ 782 case BPF_LDX | BPF_MSH | BPF_B: { 783 struct sock_filter tmp = { 784 .code = BPF_LD | BPF_ABS | BPF_B, 785 .k = fp->k, 786 }; 787 788 *seen_ld_abs = true; 789 790 /* X = A */ 791 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 792 /* A = BPF_R0 = *(u8 *) (skb->data + K) */ 793 convert_bpf_ld_abs(&tmp, &insn); 794 insn++; 795 /* A &= 0xf */ 796 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf); 797 /* A <<= 2 */ 798 *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2); 799 /* tmp = X */ 800 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_X); 801 /* X = A */ 802 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 803 /* A = tmp */ 804 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP); 805 break; 806 } 807 /* RET_K is remaped into 2 insns. RET_A case doesn't need an 808 * extra mov as BPF_REG_0 is already mapped into BPF_REG_A. 809 */ 810 case BPF_RET | BPF_A: 811 case BPF_RET | BPF_K: 812 if (BPF_RVAL(fp->code) == BPF_K) 813 *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0, 814 0, fp->k); 815 *insn = BPF_EXIT_INSN(); 816 break; 817 818 /* Store to stack. */ 819 case BPF_ST: 820 case BPF_STX: 821 stack_off = fp->k * 4 + 4; 822 *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) == 823 BPF_ST ? BPF_REG_A : BPF_REG_X, 824 -stack_off); 825 /* check_load_and_stores() verifies that classic BPF can 826 * load from stack only after write, so tracking 827 * stack_depth for ST|STX insns is enough 828 */ 829 if (new_prog && new_prog->aux->stack_depth < stack_off) 830 new_prog->aux->stack_depth = stack_off; 831 break; 832 833 /* Load from stack. */ 834 case BPF_LD | BPF_MEM: 835 case BPF_LDX | BPF_MEM: 836 stack_off = fp->k * 4 + 4; 837 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? 838 BPF_REG_A : BPF_REG_X, BPF_REG_FP, 839 -stack_off); 840 break; 841 842 /* A = K or X = K */ 843 case BPF_LD | BPF_IMM: 844 case BPF_LDX | BPF_IMM: 845 *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ? 846 BPF_REG_A : BPF_REG_X, fp->k); 847 break; 848 849 /* X = A */ 850 case BPF_MISC | BPF_TAX: 851 *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 852 break; 853 854 /* A = X */ 855 case BPF_MISC | BPF_TXA: 856 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X); 857 break; 858 859 /* A = skb->len or X = skb->len */ 860 case BPF_LD | BPF_W | BPF_LEN: 861 case BPF_LDX | BPF_W | BPF_LEN: 862 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? 863 BPF_REG_A : BPF_REG_X, BPF_REG_CTX, 864 offsetof(struct sk_buff, len)); 865 break; 866 867 /* Access seccomp_data fields. */ 868 case BPF_LDX | BPF_ABS | BPF_W: 869 /* A = *(u32 *) (ctx + K) */ 870 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k); 871 break; 872 873 /* Unknown instruction. */ 874 default: 875 goto err; 876 } 877 878 insn++; 879 if (new_prog) 880 memcpy(new_insn, tmp_insns, 881 sizeof(*insn) * (insn - tmp_insns)); 882 new_insn += insn - tmp_insns; 883 } 884 885 if (!new_prog) { 886 /* Only calculating new length. */ 887 *new_len = new_insn - first_insn; 888 if (*seen_ld_abs) 889 *new_len += 4; /* Prologue bits. */ 890 return 0; 891 } 892 893 pass++; 894 if (new_flen != new_insn - first_insn) { 895 new_flen = new_insn - first_insn; 896 if (pass > 2) 897 goto err; 898 goto do_pass; 899 } 900 901 kfree(addrs); 902 BUG_ON(*new_len != new_flen); 903 return 0; 904 err: 905 kfree(addrs); 906 return -EINVAL; 907 } 908 909 /* Security: 910 * 911 * As we dont want to clear mem[] array for each packet going through 912 * __bpf_prog_run(), we check that filter loaded by user never try to read 913 * a cell if not previously written, and we check all branches to be sure 914 * a malicious user doesn't try to abuse us. 915 */ 916 static int check_load_and_stores(const struct sock_filter *filter, int flen) 917 { 918 u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */ 919 int pc, ret = 0; 920 921 BUILD_BUG_ON(BPF_MEMWORDS > 16); 922 923 masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL); 924 if (!masks) 925 return -ENOMEM; 926 927 memset(masks, 0xff, flen * sizeof(*masks)); 928 929 for (pc = 0; pc < flen; pc++) { 930 memvalid &= masks[pc]; 931 932 switch (filter[pc].code) { 933 case BPF_ST: 934 case BPF_STX: 935 memvalid |= (1 << filter[pc].k); 936 break; 937 case BPF_LD | BPF_MEM: 938 case BPF_LDX | BPF_MEM: 939 if (!(memvalid & (1 << filter[pc].k))) { 940 ret = -EINVAL; 941 goto error; 942 } 943 break; 944 case BPF_JMP | BPF_JA: 945 /* A jump must set masks on target */ 946 masks[pc + 1 + filter[pc].k] &= memvalid; 947 memvalid = ~0; 948 break; 949 case BPF_JMP | BPF_JEQ | BPF_K: 950 case BPF_JMP | BPF_JEQ | BPF_X: 951 case BPF_JMP | BPF_JGE | BPF_K: 952 case BPF_JMP | BPF_JGE | BPF_X: 953 case BPF_JMP | BPF_JGT | BPF_K: 954 case BPF_JMP | BPF_JGT | BPF_X: 955 case BPF_JMP | BPF_JSET | BPF_K: 956 case BPF_JMP | BPF_JSET | BPF_X: 957 /* A jump must set masks on targets */ 958 masks[pc + 1 + filter[pc].jt] &= memvalid; 959 masks[pc + 1 + filter[pc].jf] &= memvalid; 960 memvalid = ~0; 961 break; 962 } 963 } 964 error: 965 kfree(masks); 966 return ret; 967 } 968 969 static bool chk_code_allowed(u16 code_to_probe) 970 { 971 static const bool codes[] = { 972 /* 32 bit ALU operations */ 973 [BPF_ALU | BPF_ADD | BPF_K] = true, 974 [BPF_ALU | BPF_ADD | BPF_X] = true, 975 [BPF_ALU | BPF_SUB | BPF_K] = true, 976 [BPF_ALU | BPF_SUB | BPF_X] = true, 977 [BPF_ALU | BPF_MUL | BPF_K] = true, 978 [BPF_ALU | BPF_MUL | BPF_X] = true, 979 [BPF_ALU | BPF_DIV | BPF_K] = true, 980 [BPF_ALU | BPF_DIV | BPF_X] = true, 981 [BPF_ALU | BPF_MOD | BPF_K] = true, 982 [BPF_ALU | BPF_MOD | BPF_X] = true, 983 [BPF_ALU | BPF_AND | BPF_K] = true, 984 [BPF_ALU | BPF_AND | BPF_X] = true, 985 [BPF_ALU | BPF_OR | BPF_K] = true, 986 [BPF_ALU | BPF_OR | BPF_X] = true, 987 [BPF_ALU | BPF_XOR | BPF_K] = true, 988 [BPF_ALU | BPF_XOR | BPF_X] = true, 989 [BPF_ALU | BPF_LSH | BPF_K] = true, 990 [BPF_ALU | BPF_LSH | BPF_X] = true, 991 [BPF_ALU | BPF_RSH | BPF_K] = true, 992 [BPF_ALU | BPF_RSH | BPF_X] = true, 993 [BPF_ALU | BPF_NEG] = true, 994 /* Load instructions */ 995 [BPF_LD | BPF_W | BPF_ABS] = true, 996 [BPF_LD | BPF_H | BPF_ABS] = true, 997 [BPF_LD | BPF_B | BPF_ABS] = true, 998 [BPF_LD | BPF_W | BPF_LEN] = true, 999 [BPF_LD | BPF_W | BPF_IND] = true, 1000 [BPF_LD | BPF_H | BPF_IND] = true, 1001 [BPF_LD | BPF_B | BPF_IND] = true, 1002 [BPF_LD | BPF_IMM] = true, 1003 [BPF_LD | BPF_MEM] = true, 1004 [BPF_LDX | BPF_W | BPF_LEN] = true, 1005 [BPF_LDX | BPF_B | BPF_MSH] = true, 1006 [BPF_LDX | BPF_IMM] = true, 1007 [BPF_LDX | BPF_MEM] = true, 1008 /* Store instructions */ 1009 [BPF_ST] = true, 1010 [BPF_STX] = true, 1011 /* Misc instructions */ 1012 [BPF_MISC | BPF_TAX] = true, 1013 [BPF_MISC | BPF_TXA] = true, 1014 /* Return instructions */ 1015 [BPF_RET | BPF_K] = true, 1016 [BPF_RET | BPF_A] = true, 1017 /* Jump instructions */ 1018 [BPF_JMP | BPF_JA] = true, 1019 [BPF_JMP | BPF_JEQ | BPF_K] = true, 1020 [BPF_JMP | BPF_JEQ | BPF_X] = true, 1021 [BPF_JMP | BPF_JGE | BPF_K] = true, 1022 [BPF_JMP | BPF_JGE | BPF_X] = true, 1023 [BPF_JMP | BPF_JGT | BPF_K] = true, 1024 [BPF_JMP | BPF_JGT | BPF_X] = true, 1025 [BPF_JMP | BPF_JSET | BPF_K] = true, 1026 [BPF_JMP | BPF_JSET | BPF_X] = true, 1027 }; 1028 1029 if (code_to_probe >= ARRAY_SIZE(codes)) 1030 return false; 1031 1032 return codes[code_to_probe]; 1033 } 1034 1035 static bool bpf_check_basics_ok(const struct sock_filter *filter, 1036 unsigned int flen) 1037 { 1038 if (filter == NULL) 1039 return false; 1040 if (flen == 0 || flen > BPF_MAXINSNS) 1041 return false; 1042 1043 return true; 1044 } 1045 1046 /** 1047 * bpf_check_classic - verify socket filter code 1048 * @filter: filter to verify 1049 * @flen: length of filter 1050 * 1051 * Check the user's filter code. If we let some ugly 1052 * filter code slip through kaboom! The filter must contain 1053 * no references or jumps that are out of range, no illegal 1054 * instructions, and must end with a RET instruction. 1055 * 1056 * All jumps are forward as they are not signed. 1057 * 1058 * Returns 0 if the rule set is legal or -EINVAL if not. 1059 */ 1060 static int bpf_check_classic(const struct sock_filter *filter, 1061 unsigned int flen) 1062 { 1063 bool anc_found; 1064 int pc; 1065 1066 /* Check the filter code now */ 1067 for (pc = 0; pc < flen; pc++) { 1068 const struct sock_filter *ftest = &filter[pc]; 1069 1070 /* May we actually operate on this code? */ 1071 if (!chk_code_allowed(ftest->code)) 1072 return -EINVAL; 1073 1074 /* Some instructions need special checks */ 1075 switch (ftest->code) { 1076 case BPF_ALU | BPF_DIV | BPF_K: 1077 case BPF_ALU | BPF_MOD | BPF_K: 1078 /* Check for division by zero */ 1079 if (ftest->k == 0) 1080 return -EINVAL; 1081 break; 1082 case BPF_ALU | BPF_LSH | BPF_K: 1083 case BPF_ALU | BPF_RSH | BPF_K: 1084 if (ftest->k >= 32) 1085 return -EINVAL; 1086 break; 1087 case BPF_LD | BPF_MEM: 1088 case BPF_LDX | BPF_MEM: 1089 case BPF_ST: 1090 case BPF_STX: 1091 /* Check for invalid memory addresses */ 1092 if (ftest->k >= BPF_MEMWORDS) 1093 return -EINVAL; 1094 break; 1095 case BPF_JMP | BPF_JA: 1096 /* Note, the large ftest->k might cause loops. 1097 * Compare this with conditional jumps below, 1098 * where offsets are limited. --ANK (981016) 1099 */ 1100 if (ftest->k >= (unsigned int)(flen - pc - 1)) 1101 return -EINVAL; 1102 break; 1103 case BPF_JMP | BPF_JEQ | BPF_K: 1104 case BPF_JMP | BPF_JEQ | BPF_X: 1105 case BPF_JMP | BPF_JGE | BPF_K: 1106 case BPF_JMP | BPF_JGE | BPF_X: 1107 case BPF_JMP | BPF_JGT | BPF_K: 1108 case BPF_JMP | BPF_JGT | BPF_X: 1109 case BPF_JMP | BPF_JSET | BPF_K: 1110 case BPF_JMP | BPF_JSET | BPF_X: 1111 /* Both conditionals must be safe */ 1112 if (pc + ftest->jt + 1 >= flen || 1113 pc + ftest->jf + 1 >= flen) 1114 return -EINVAL; 1115 break; 1116 case BPF_LD | BPF_W | BPF_ABS: 1117 case BPF_LD | BPF_H | BPF_ABS: 1118 case BPF_LD | BPF_B | BPF_ABS: 1119 anc_found = false; 1120 if (bpf_anc_helper(ftest) & BPF_ANC) 1121 anc_found = true; 1122 /* Ancillary operation unknown or unsupported */ 1123 if (anc_found == false && ftest->k >= SKF_AD_OFF) 1124 return -EINVAL; 1125 } 1126 } 1127 1128 /* Last instruction must be a RET code */ 1129 switch (filter[flen - 1].code) { 1130 case BPF_RET | BPF_K: 1131 case BPF_RET | BPF_A: 1132 return check_load_and_stores(filter, flen); 1133 } 1134 1135 return -EINVAL; 1136 } 1137 1138 static int bpf_prog_store_orig_filter(struct bpf_prog *fp, 1139 const struct sock_fprog *fprog) 1140 { 1141 unsigned int fsize = bpf_classic_proglen(fprog); 1142 struct sock_fprog_kern *fkprog; 1143 1144 fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL); 1145 if (!fp->orig_prog) 1146 return -ENOMEM; 1147 1148 fkprog = fp->orig_prog; 1149 fkprog->len = fprog->len; 1150 1151 fkprog->filter = kmemdup(fp->insns, fsize, 1152 GFP_KERNEL | __GFP_NOWARN); 1153 if (!fkprog->filter) { 1154 kfree(fp->orig_prog); 1155 return -ENOMEM; 1156 } 1157 1158 return 0; 1159 } 1160 1161 static void bpf_release_orig_filter(struct bpf_prog *fp) 1162 { 1163 struct sock_fprog_kern *fprog = fp->orig_prog; 1164 1165 if (fprog) { 1166 kfree(fprog->filter); 1167 kfree(fprog); 1168 } 1169 } 1170 1171 static void __bpf_prog_release(struct bpf_prog *prog) 1172 { 1173 if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) { 1174 bpf_prog_put(prog); 1175 } else { 1176 bpf_release_orig_filter(prog); 1177 bpf_prog_free(prog); 1178 } 1179 } 1180 1181 static void __sk_filter_release(struct sk_filter *fp) 1182 { 1183 __bpf_prog_release(fp->prog); 1184 kfree(fp); 1185 } 1186 1187 /** 1188 * sk_filter_release_rcu - Release a socket filter by rcu_head 1189 * @rcu: rcu_head that contains the sk_filter to free 1190 */ 1191 static void sk_filter_release_rcu(struct rcu_head *rcu) 1192 { 1193 struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu); 1194 1195 __sk_filter_release(fp); 1196 } 1197 1198 /** 1199 * sk_filter_release - release a socket filter 1200 * @fp: filter to remove 1201 * 1202 * Remove a filter from a socket and release its resources. 1203 */ 1204 static void sk_filter_release(struct sk_filter *fp) 1205 { 1206 if (refcount_dec_and_test(&fp->refcnt)) 1207 call_rcu(&fp->rcu, sk_filter_release_rcu); 1208 } 1209 1210 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) 1211 { 1212 u32 filter_size = bpf_prog_size(fp->prog->len); 1213 1214 atomic_sub(filter_size, &sk->sk_omem_alloc); 1215 sk_filter_release(fp); 1216 } 1217 1218 /* try to charge the socket memory if there is space available 1219 * return true on success 1220 */ 1221 static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp) 1222 { 1223 int optmem_max = READ_ONCE(sock_net(sk)->core.sysctl_optmem_max); 1224 u32 filter_size = bpf_prog_size(fp->prog->len); 1225 1226 /* same check as in sock_kmalloc() */ 1227 if (filter_size <= optmem_max && 1228 atomic_read(&sk->sk_omem_alloc) + filter_size < optmem_max) { 1229 atomic_add(filter_size, &sk->sk_omem_alloc); 1230 return true; 1231 } 1232 return false; 1233 } 1234 1235 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp) 1236 { 1237 if (!refcount_inc_not_zero(&fp->refcnt)) 1238 return false; 1239 1240 if (!__sk_filter_charge(sk, fp)) { 1241 sk_filter_release(fp); 1242 return false; 1243 } 1244 return true; 1245 } 1246 1247 static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp) 1248 { 1249 struct sock_filter *old_prog; 1250 struct bpf_prog *old_fp; 1251 int err, new_len, old_len = fp->len; 1252 bool seen_ld_abs = false; 1253 1254 /* We are free to overwrite insns et al right here as it won't be used at 1255 * this point in time anymore internally after the migration to the eBPF 1256 * instruction representation. 1257 */ 1258 BUILD_BUG_ON(sizeof(struct sock_filter) != 1259 sizeof(struct bpf_insn)); 1260 1261 /* Conversion cannot happen on overlapping memory areas, 1262 * so we need to keep the user BPF around until the 2nd 1263 * pass. At this time, the user BPF is stored in fp->insns. 1264 */ 1265 old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter), 1266 GFP_KERNEL | __GFP_NOWARN); 1267 if (!old_prog) { 1268 err = -ENOMEM; 1269 goto out_err; 1270 } 1271 1272 /* 1st pass: calculate the new program length. */ 1273 err = bpf_convert_filter(old_prog, old_len, NULL, &new_len, 1274 &seen_ld_abs); 1275 if (err) 1276 goto out_err_free; 1277 1278 /* Expand fp for appending the new filter representation. */ 1279 old_fp = fp; 1280 fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0); 1281 if (!fp) { 1282 /* The old_fp is still around in case we couldn't 1283 * allocate new memory, so uncharge on that one. 1284 */ 1285 fp = old_fp; 1286 err = -ENOMEM; 1287 goto out_err_free; 1288 } 1289 1290 fp->len = new_len; 1291 1292 /* 2nd pass: remap sock_filter insns into bpf_insn insns. */ 1293 err = bpf_convert_filter(old_prog, old_len, fp, &new_len, 1294 &seen_ld_abs); 1295 if (err) 1296 /* 2nd bpf_convert_filter() can fail only if it fails 1297 * to allocate memory, remapping must succeed. Note, 1298 * that at this time old_fp has already been released 1299 * by krealloc(). 1300 */ 1301 goto out_err_free; 1302 1303 fp = bpf_prog_select_runtime(fp, &err); 1304 if (err) 1305 goto out_err_free; 1306 1307 kfree(old_prog); 1308 return fp; 1309 1310 out_err_free: 1311 kfree(old_prog); 1312 out_err: 1313 __bpf_prog_release(fp); 1314 return ERR_PTR(err); 1315 } 1316 1317 static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp, 1318 bpf_aux_classic_check_t trans) 1319 { 1320 int err; 1321 1322 fp->bpf_func = NULL; 1323 fp->jited = 0; 1324 1325 err = bpf_check_classic(fp->insns, fp->len); 1326 if (err) { 1327 __bpf_prog_release(fp); 1328 return ERR_PTR(err); 1329 } 1330 1331 /* There might be additional checks and transformations 1332 * needed on classic filters, f.e. in case of seccomp. 1333 */ 1334 if (trans) { 1335 err = trans(fp->insns, fp->len); 1336 if (err) { 1337 __bpf_prog_release(fp); 1338 return ERR_PTR(err); 1339 } 1340 } 1341 1342 /* Probe if we can JIT compile the filter and if so, do 1343 * the compilation of the filter. 1344 */ 1345 bpf_jit_compile(fp); 1346 1347 /* JIT compiler couldn't process this filter, so do the eBPF translation 1348 * for the optimized interpreter. 1349 */ 1350 if (!fp->jited) 1351 fp = bpf_migrate_filter(fp); 1352 1353 return fp; 1354 } 1355 1356 /** 1357 * bpf_prog_create - create an unattached filter 1358 * @pfp: the unattached filter that is created 1359 * @fprog: the filter program 1360 * 1361 * Create a filter independent of any socket. We first run some 1362 * sanity checks on it to make sure it does not explode on us later. 1363 * If an error occurs or there is insufficient memory for the filter 1364 * a negative errno code is returned. On success the return is zero. 1365 */ 1366 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog) 1367 { 1368 unsigned int fsize = bpf_classic_proglen(fprog); 1369 struct bpf_prog *fp; 1370 1371 /* Make sure new filter is there and in the right amounts. */ 1372 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1373 return -EINVAL; 1374 1375 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1376 if (!fp) 1377 return -ENOMEM; 1378 1379 memcpy(fp->insns, fprog->filter, fsize); 1380 1381 fp->len = fprog->len; 1382 /* Since unattached filters are not copied back to user 1383 * space through sk_get_filter(), we do not need to hold 1384 * a copy here, and can spare us the work. 1385 */ 1386 fp->orig_prog = NULL; 1387 1388 /* bpf_prepare_filter() already takes care of freeing 1389 * memory in case something goes wrong. 1390 */ 1391 fp = bpf_prepare_filter(fp, NULL); 1392 if (IS_ERR(fp)) 1393 return PTR_ERR(fp); 1394 1395 *pfp = fp; 1396 return 0; 1397 } 1398 EXPORT_SYMBOL_GPL(bpf_prog_create); 1399 1400 /** 1401 * bpf_prog_create_from_user - create an unattached filter from user buffer 1402 * @pfp: the unattached filter that is created 1403 * @fprog: the filter program 1404 * @trans: post-classic verifier transformation handler 1405 * @save_orig: save classic BPF program 1406 * 1407 * This function effectively does the same as bpf_prog_create(), only 1408 * that it builds up its insns buffer from user space provided buffer. 1409 * It also allows for passing a bpf_aux_classic_check_t handler. 1410 */ 1411 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, 1412 bpf_aux_classic_check_t trans, bool save_orig) 1413 { 1414 unsigned int fsize = bpf_classic_proglen(fprog); 1415 struct bpf_prog *fp; 1416 int err; 1417 1418 /* Make sure new filter is there and in the right amounts. */ 1419 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1420 return -EINVAL; 1421 1422 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1423 if (!fp) 1424 return -ENOMEM; 1425 1426 if (copy_from_user(fp->insns, fprog->filter, fsize)) { 1427 __bpf_prog_free(fp); 1428 return -EFAULT; 1429 } 1430 1431 fp->len = fprog->len; 1432 fp->orig_prog = NULL; 1433 1434 if (save_orig) { 1435 err = bpf_prog_store_orig_filter(fp, fprog); 1436 if (err) { 1437 __bpf_prog_free(fp); 1438 return -ENOMEM; 1439 } 1440 } 1441 1442 /* bpf_prepare_filter() already takes care of freeing 1443 * memory in case something goes wrong. 1444 */ 1445 fp = bpf_prepare_filter(fp, trans); 1446 if (IS_ERR(fp)) 1447 return PTR_ERR(fp); 1448 1449 *pfp = fp; 1450 return 0; 1451 } 1452 EXPORT_SYMBOL_GPL(bpf_prog_create_from_user); 1453 1454 void bpf_prog_destroy(struct bpf_prog *fp) 1455 { 1456 __bpf_prog_release(fp); 1457 } 1458 EXPORT_SYMBOL_GPL(bpf_prog_destroy); 1459 1460 static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk) 1461 { 1462 struct sk_filter *fp, *old_fp; 1463 1464 fp = kmalloc(sizeof(*fp), GFP_KERNEL); 1465 if (!fp) 1466 return -ENOMEM; 1467 1468 fp->prog = prog; 1469 1470 if (!__sk_filter_charge(sk, fp)) { 1471 kfree(fp); 1472 return -ENOMEM; 1473 } 1474 refcount_set(&fp->refcnt, 1); 1475 1476 old_fp = rcu_dereference_protected(sk->sk_filter, 1477 lockdep_sock_is_held(sk)); 1478 rcu_assign_pointer(sk->sk_filter, fp); 1479 1480 if (old_fp) 1481 sk_filter_uncharge(sk, old_fp); 1482 1483 return 0; 1484 } 1485 1486 static 1487 struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk) 1488 { 1489 unsigned int fsize = bpf_classic_proglen(fprog); 1490 struct bpf_prog *prog; 1491 int err; 1492 1493 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1494 return ERR_PTR(-EPERM); 1495 1496 /* Make sure new filter is there and in the right amounts. */ 1497 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1498 return ERR_PTR(-EINVAL); 1499 1500 prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1501 if (!prog) 1502 return ERR_PTR(-ENOMEM); 1503 1504 if (copy_from_user(prog->insns, fprog->filter, fsize)) { 1505 __bpf_prog_free(prog); 1506 return ERR_PTR(-EFAULT); 1507 } 1508 1509 prog->len = fprog->len; 1510 1511 err = bpf_prog_store_orig_filter(prog, fprog); 1512 if (err) { 1513 __bpf_prog_free(prog); 1514 return ERR_PTR(-ENOMEM); 1515 } 1516 1517 /* bpf_prepare_filter() already takes care of freeing 1518 * memory in case something goes wrong. 1519 */ 1520 return bpf_prepare_filter(prog, NULL); 1521 } 1522 1523 /** 1524 * sk_attach_filter - attach a socket filter 1525 * @fprog: the filter program 1526 * @sk: the socket to use 1527 * 1528 * Attach the user's filter code. We first run some sanity checks on 1529 * it to make sure it does not explode on us later. If an error 1530 * occurs or there is insufficient memory for the filter a negative 1531 * errno code is returned. On success the return is zero. 1532 */ 1533 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk) 1534 { 1535 struct bpf_prog *prog = __get_filter(fprog, sk); 1536 int err; 1537 1538 if (IS_ERR(prog)) 1539 return PTR_ERR(prog); 1540 1541 err = __sk_attach_prog(prog, sk); 1542 if (err < 0) { 1543 __bpf_prog_release(prog); 1544 return err; 1545 } 1546 1547 return 0; 1548 } 1549 EXPORT_SYMBOL_GPL(sk_attach_filter); 1550 1551 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk) 1552 { 1553 struct bpf_prog *prog = __get_filter(fprog, sk); 1554 int err, optmem_max; 1555 1556 if (IS_ERR(prog)) 1557 return PTR_ERR(prog); 1558 1559 optmem_max = READ_ONCE(sock_net(sk)->core.sysctl_optmem_max); 1560 if (bpf_prog_size(prog->len) > optmem_max) 1561 err = -ENOMEM; 1562 else 1563 err = reuseport_attach_prog(sk, prog); 1564 1565 if (err) 1566 __bpf_prog_release(prog); 1567 1568 return err; 1569 } 1570 1571 static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk) 1572 { 1573 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1574 return ERR_PTR(-EPERM); 1575 1576 return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); 1577 } 1578 1579 int sk_attach_bpf(u32 ufd, struct sock *sk) 1580 { 1581 struct bpf_prog *prog = __get_bpf(ufd, sk); 1582 int err; 1583 1584 if (IS_ERR(prog)) 1585 return PTR_ERR(prog); 1586 1587 err = __sk_attach_prog(prog, sk); 1588 if (err < 0) { 1589 bpf_prog_put(prog); 1590 return err; 1591 } 1592 1593 return 0; 1594 } 1595 1596 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk) 1597 { 1598 struct bpf_prog *prog; 1599 int err, optmem_max; 1600 1601 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1602 return -EPERM; 1603 1604 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); 1605 if (PTR_ERR(prog) == -EINVAL) 1606 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SK_REUSEPORT); 1607 if (IS_ERR(prog)) 1608 return PTR_ERR(prog); 1609 1610 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) { 1611 /* Like other non BPF_PROG_TYPE_SOCKET_FILTER 1612 * bpf prog (e.g. sockmap). It depends on the 1613 * limitation imposed by bpf_prog_load(). 1614 * Hence, sysctl_optmem_max is not checked. 1615 */ 1616 if ((sk->sk_type != SOCK_STREAM && 1617 sk->sk_type != SOCK_DGRAM) || 1618 (sk->sk_protocol != IPPROTO_UDP && 1619 sk->sk_protocol != IPPROTO_TCP) || 1620 (sk->sk_family != AF_INET && 1621 sk->sk_family != AF_INET6)) { 1622 err = -ENOTSUPP; 1623 goto err_prog_put; 1624 } 1625 } else { 1626 /* BPF_PROG_TYPE_SOCKET_FILTER */ 1627 optmem_max = READ_ONCE(sock_net(sk)->core.sysctl_optmem_max); 1628 if (bpf_prog_size(prog->len) > optmem_max) { 1629 err = -ENOMEM; 1630 goto err_prog_put; 1631 } 1632 } 1633 1634 err = reuseport_attach_prog(sk, prog); 1635 err_prog_put: 1636 if (err) 1637 bpf_prog_put(prog); 1638 1639 return err; 1640 } 1641 1642 void sk_reuseport_prog_free(struct bpf_prog *prog) 1643 { 1644 if (!prog) 1645 return; 1646 1647 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) 1648 bpf_prog_put(prog); 1649 else 1650 bpf_prog_destroy(prog); 1651 } 1652 1653 struct bpf_scratchpad { 1654 union { 1655 __be32 diff[MAX_BPF_STACK / sizeof(__be32)]; 1656 u8 buff[MAX_BPF_STACK]; 1657 }; 1658 }; 1659 1660 static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp); 1661 1662 static inline int __bpf_try_make_writable(struct sk_buff *skb, 1663 unsigned int write_len) 1664 { 1665 return skb_ensure_writable(skb, write_len); 1666 } 1667 1668 static inline int bpf_try_make_writable(struct sk_buff *skb, 1669 unsigned int write_len) 1670 { 1671 int err = __bpf_try_make_writable(skb, write_len); 1672 1673 bpf_compute_data_pointers(skb); 1674 return err; 1675 } 1676 1677 static int bpf_try_make_head_writable(struct sk_buff *skb) 1678 { 1679 return bpf_try_make_writable(skb, skb_headlen(skb)); 1680 } 1681 1682 static inline void bpf_push_mac_rcsum(struct sk_buff *skb) 1683 { 1684 if (skb_at_tc_ingress(skb)) 1685 skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len); 1686 } 1687 1688 static inline void bpf_pull_mac_rcsum(struct sk_buff *skb) 1689 { 1690 if (skb_at_tc_ingress(skb)) 1691 skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len); 1692 } 1693 1694 BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset, 1695 const void *, from, u32, len, u64, flags) 1696 { 1697 void *ptr; 1698 1699 if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH))) 1700 return -EINVAL; 1701 if (unlikely(offset > INT_MAX)) 1702 return -EFAULT; 1703 if (unlikely(bpf_try_make_writable(skb, offset + len))) 1704 return -EFAULT; 1705 1706 ptr = skb->data + offset; 1707 if (flags & BPF_F_RECOMPUTE_CSUM) 1708 __skb_postpull_rcsum(skb, ptr, len, offset); 1709 1710 memcpy(ptr, from, len); 1711 1712 if (flags & BPF_F_RECOMPUTE_CSUM) 1713 __skb_postpush_rcsum(skb, ptr, len, offset); 1714 if (flags & BPF_F_INVALIDATE_HASH) 1715 skb_clear_hash(skb); 1716 1717 return 0; 1718 } 1719 1720 static const struct bpf_func_proto bpf_skb_store_bytes_proto = { 1721 .func = bpf_skb_store_bytes, 1722 .gpl_only = false, 1723 .ret_type = RET_INTEGER, 1724 .arg1_type = ARG_PTR_TO_CTX, 1725 .arg2_type = ARG_ANYTHING, 1726 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 1727 .arg4_type = ARG_CONST_SIZE, 1728 .arg5_type = ARG_ANYTHING, 1729 }; 1730 1731 int __bpf_skb_store_bytes(struct sk_buff *skb, u32 offset, const void *from, 1732 u32 len, u64 flags) 1733 { 1734 return ____bpf_skb_store_bytes(skb, offset, from, len, flags); 1735 } 1736 1737 BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset, 1738 void *, to, u32, len) 1739 { 1740 void *ptr; 1741 1742 if (unlikely(offset > INT_MAX)) 1743 goto err_clear; 1744 1745 ptr = skb_header_pointer(skb, offset, len, to); 1746 if (unlikely(!ptr)) 1747 goto err_clear; 1748 if (ptr != to) 1749 memcpy(to, ptr, len); 1750 1751 return 0; 1752 err_clear: 1753 memset(to, 0, len); 1754 return -EFAULT; 1755 } 1756 1757 static const struct bpf_func_proto bpf_skb_load_bytes_proto = { 1758 .func = bpf_skb_load_bytes, 1759 .gpl_only = false, 1760 .ret_type = RET_INTEGER, 1761 .arg1_type = ARG_PTR_TO_CTX, 1762 .arg2_type = ARG_ANYTHING, 1763 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1764 .arg4_type = ARG_CONST_SIZE, 1765 }; 1766 1767 int __bpf_skb_load_bytes(const struct sk_buff *skb, u32 offset, void *to, u32 len) 1768 { 1769 return ____bpf_skb_load_bytes(skb, offset, to, len); 1770 } 1771 1772 BPF_CALL_4(bpf_flow_dissector_load_bytes, 1773 const struct bpf_flow_dissector *, ctx, u32, offset, 1774 void *, to, u32, len) 1775 { 1776 void *ptr; 1777 1778 if (unlikely(offset > 0xffff)) 1779 goto err_clear; 1780 1781 if (unlikely(!ctx->skb)) 1782 goto err_clear; 1783 1784 ptr = skb_header_pointer(ctx->skb, offset, len, to); 1785 if (unlikely(!ptr)) 1786 goto err_clear; 1787 if (ptr != to) 1788 memcpy(to, ptr, len); 1789 1790 return 0; 1791 err_clear: 1792 memset(to, 0, len); 1793 return -EFAULT; 1794 } 1795 1796 static const struct bpf_func_proto bpf_flow_dissector_load_bytes_proto = { 1797 .func = bpf_flow_dissector_load_bytes, 1798 .gpl_only = false, 1799 .ret_type = RET_INTEGER, 1800 .arg1_type = ARG_PTR_TO_CTX, 1801 .arg2_type = ARG_ANYTHING, 1802 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1803 .arg4_type = ARG_CONST_SIZE, 1804 }; 1805 1806 BPF_CALL_5(bpf_skb_load_bytes_relative, const struct sk_buff *, skb, 1807 u32, offset, void *, to, u32, len, u32, start_header) 1808 { 1809 u8 *end = skb_tail_pointer(skb); 1810 u8 *start, *ptr; 1811 1812 if (unlikely(offset > 0xffff)) 1813 goto err_clear; 1814 1815 switch (start_header) { 1816 case BPF_HDR_START_MAC: 1817 if (unlikely(!skb_mac_header_was_set(skb))) 1818 goto err_clear; 1819 start = skb_mac_header(skb); 1820 break; 1821 case BPF_HDR_START_NET: 1822 start = skb_network_header(skb); 1823 break; 1824 default: 1825 goto err_clear; 1826 } 1827 1828 ptr = start + offset; 1829 1830 if (likely(ptr + len <= end)) { 1831 memcpy(to, ptr, len); 1832 return 0; 1833 } 1834 1835 err_clear: 1836 memset(to, 0, len); 1837 return -EFAULT; 1838 } 1839 1840 static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto = { 1841 .func = bpf_skb_load_bytes_relative, 1842 .gpl_only = false, 1843 .ret_type = RET_INTEGER, 1844 .arg1_type = ARG_PTR_TO_CTX, 1845 .arg2_type = ARG_ANYTHING, 1846 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1847 .arg4_type = ARG_CONST_SIZE, 1848 .arg5_type = ARG_ANYTHING, 1849 }; 1850 1851 BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len) 1852 { 1853 /* Idea is the following: should the needed direct read/write 1854 * test fail during runtime, we can pull in more data and redo 1855 * again, since implicitly, we invalidate previous checks here. 1856 * 1857 * Or, since we know how much we need to make read/writeable, 1858 * this can be done once at the program beginning for direct 1859 * access case. By this we overcome limitations of only current 1860 * headroom being accessible. 1861 */ 1862 return bpf_try_make_writable(skb, len ? : skb_headlen(skb)); 1863 } 1864 1865 static const struct bpf_func_proto bpf_skb_pull_data_proto = { 1866 .func = bpf_skb_pull_data, 1867 .gpl_only = false, 1868 .ret_type = RET_INTEGER, 1869 .arg1_type = ARG_PTR_TO_CTX, 1870 .arg2_type = ARG_ANYTHING, 1871 }; 1872 1873 BPF_CALL_1(bpf_sk_fullsock, struct sock *, sk) 1874 { 1875 return sk_fullsock(sk) ? (unsigned long)sk : (unsigned long)NULL; 1876 } 1877 1878 static const struct bpf_func_proto bpf_sk_fullsock_proto = { 1879 .func = bpf_sk_fullsock, 1880 .gpl_only = false, 1881 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 1882 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 1883 }; 1884 1885 static inline int sk_skb_try_make_writable(struct sk_buff *skb, 1886 unsigned int write_len) 1887 { 1888 return __bpf_try_make_writable(skb, write_len); 1889 } 1890 1891 BPF_CALL_2(sk_skb_pull_data, struct sk_buff *, skb, u32, len) 1892 { 1893 /* Idea is the following: should the needed direct read/write 1894 * test fail during runtime, we can pull in more data and redo 1895 * again, since implicitly, we invalidate previous checks here. 1896 * 1897 * Or, since we know how much we need to make read/writeable, 1898 * this can be done once at the program beginning for direct 1899 * access case. By this we overcome limitations of only current 1900 * headroom being accessible. 1901 */ 1902 return sk_skb_try_make_writable(skb, len ? : skb_headlen(skb)); 1903 } 1904 1905 static const struct bpf_func_proto sk_skb_pull_data_proto = { 1906 .func = sk_skb_pull_data, 1907 .gpl_only = false, 1908 .ret_type = RET_INTEGER, 1909 .arg1_type = ARG_PTR_TO_CTX, 1910 .arg2_type = ARG_ANYTHING, 1911 }; 1912 1913 BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset, 1914 u64, from, u64, to, u64, flags) 1915 { 1916 __sum16 *ptr; 1917 1918 if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK))) 1919 return -EINVAL; 1920 if (unlikely(offset > 0xffff || offset & 1)) 1921 return -EFAULT; 1922 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) 1923 return -EFAULT; 1924 1925 ptr = (__sum16 *)(skb->data + offset); 1926 switch (flags & BPF_F_HDR_FIELD_MASK) { 1927 case 0: 1928 if (unlikely(from != 0)) 1929 return -EINVAL; 1930 1931 csum_replace_by_diff(ptr, to); 1932 break; 1933 case 2: 1934 csum_replace2(ptr, from, to); 1935 break; 1936 case 4: 1937 csum_replace4(ptr, from, to); 1938 break; 1939 default: 1940 return -EINVAL; 1941 } 1942 1943 return 0; 1944 } 1945 1946 static const struct bpf_func_proto bpf_l3_csum_replace_proto = { 1947 .func = bpf_l3_csum_replace, 1948 .gpl_only = false, 1949 .ret_type = RET_INTEGER, 1950 .arg1_type = ARG_PTR_TO_CTX, 1951 .arg2_type = ARG_ANYTHING, 1952 .arg3_type = ARG_ANYTHING, 1953 .arg4_type = ARG_ANYTHING, 1954 .arg5_type = ARG_ANYTHING, 1955 }; 1956 1957 BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset, 1958 u64, from, u64, to, u64, flags) 1959 { 1960 bool is_pseudo = flags & BPF_F_PSEUDO_HDR; 1961 bool is_mmzero = flags & BPF_F_MARK_MANGLED_0; 1962 bool do_mforce = flags & BPF_F_MARK_ENFORCE; 1963 __sum16 *ptr; 1964 1965 if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE | 1966 BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK))) 1967 return -EINVAL; 1968 if (unlikely(offset > 0xffff || offset & 1)) 1969 return -EFAULT; 1970 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) 1971 return -EFAULT; 1972 1973 ptr = (__sum16 *)(skb->data + offset); 1974 if (is_mmzero && !do_mforce && !*ptr) 1975 return 0; 1976 1977 switch (flags & BPF_F_HDR_FIELD_MASK) { 1978 case 0: 1979 if (unlikely(from != 0)) 1980 return -EINVAL; 1981 1982 inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo); 1983 break; 1984 case 2: 1985 inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo); 1986 break; 1987 case 4: 1988 inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo); 1989 break; 1990 default: 1991 return -EINVAL; 1992 } 1993 1994 if (is_mmzero && !*ptr) 1995 *ptr = CSUM_MANGLED_0; 1996 return 0; 1997 } 1998 1999 static const struct bpf_func_proto bpf_l4_csum_replace_proto = { 2000 .func = bpf_l4_csum_replace, 2001 .gpl_only = false, 2002 .ret_type = RET_INTEGER, 2003 .arg1_type = ARG_PTR_TO_CTX, 2004 .arg2_type = ARG_ANYTHING, 2005 .arg3_type = ARG_ANYTHING, 2006 .arg4_type = ARG_ANYTHING, 2007 .arg5_type = ARG_ANYTHING, 2008 }; 2009 2010 BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size, 2011 __be32 *, to, u32, to_size, __wsum, seed) 2012 { 2013 struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp); 2014 u32 diff_size = from_size + to_size; 2015 int i, j = 0; 2016 2017 /* This is quite flexible, some examples: 2018 * 2019 * from_size == 0, to_size > 0, seed := csum --> pushing data 2020 * from_size > 0, to_size == 0, seed := csum --> pulling data 2021 * from_size > 0, to_size > 0, seed := 0 --> diffing data 2022 * 2023 * Even for diffing, from_size and to_size don't need to be equal. 2024 */ 2025 if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) || 2026 diff_size > sizeof(sp->diff))) 2027 return -EINVAL; 2028 2029 for (i = 0; i < from_size / sizeof(__be32); i++, j++) 2030 sp->diff[j] = ~from[i]; 2031 for (i = 0; i < to_size / sizeof(__be32); i++, j++) 2032 sp->diff[j] = to[i]; 2033 2034 return csum_partial(sp->diff, diff_size, seed); 2035 } 2036 2037 static const struct bpf_func_proto bpf_csum_diff_proto = { 2038 .func = bpf_csum_diff, 2039 .gpl_only = false, 2040 .pkt_access = true, 2041 .ret_type = RET_INTEGER, 2042 .arg1_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY, 2043 .arg2_type = ARG_CONST_SIZE_OR_ZERO, 2044 .arg3_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY, 2045 .arg4_type = ARG_CONST_SIZE_OR_ZERO, 2046 .arg5_type = ARG_ANYTHING, 2047 }; 2048 2049 BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum) 2050 { 2051 /* The interface is to be used in combination with bpf_csum_diff() 2052 * for direct packet writes. csum rotation for alignment as well 2053 * as emulating csum_sub() can be done from the eBPF program. 2054 */ 2055 if (skb->ip_summed == CHECKSUM_COMPLETE) 2056 return (skb->csum = csum_add(skb->csum, csum)); 2057 2058 return -ENOTSUPP; 2059 } 2060 2061 static const struct bpf_func_proto bpf_csum_update_proto = { 2062 .func = bpf_csum_update, 2063 .gpl_only = false, 2064 .ret_type = RET_INTEGER, 2065 .arg1_type = ARG_PTR_TO_CTX, 2066 .arg2_type = ARG_ANYTHING, 2067 }; 2068 2069 BPF_CALL_2(bpf_csum_level, struct sk_buff *, skb, u64, level) 2070 { 2071 /* The interface is to be used in combination with bpf_skb_adjust_room() 2072 * for encap/decap of packet headers when BPF_F_ADJ_ROOM_NO_CSUM_RESET 2073 * is passed as flags, for example. 2074 */ 2075 switch (level) { 2076 case BPF_CSUM_LEVEL_INC: 2077 __skb_incr_checksum_unnecessary(skb); 2078 break; 2079 case BPF_CSUM_LEVEL_DEC: 2080 __skb_decr_checksum_unnecessary(skb); 2081 break; 2082 case BPF_CSUM_LEVEL_RESET: 2083 __skb_reset_checksum_unnecessary(skb); 2084 break; 2085 case BPF_CSUM_LEVEL_QUERY: 2086 return skb->ip_summed == CHECKSUM_UNNECESSARY ? 2087 skb->csum_level : -EACCES; 2088 default: 2089 return -EINVAL; 2090 } 2091 2092 return 0; 2093 } 2094 2095 static const struct bpf_func_proto bpf_csum_level_proto = { 2096 .func = bpf_csum_level, 2097 .gpl_only = false, 2098 .ret_type = RET_INTEGER, 2099 .arg1_type = ARG_PTR_TO_CTX, 2100 .arg2_type = ARG_ANYTHING, 2101 }; 2102 2103 static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb) 2104 { 2105 return dev_forward_skb_nomtu(dev, skb); 2106 } 2107 2108 static inline int __bpf_rx_skb_no_mac(struct net_device *dev, 2109 struct sk_buff *skb) 2110 { 2111 int ret = ____dev_forward_skb(dev, skb, false); 2112 2113 if (likely(!ret)) { 2114 skb->dev = dev; 2115 ret = netif_rx(skb); 2116 } 2117 2118 return ret; 2119 } 2120 2121 static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb) 2122 { 2123 int ret; 2124 2125 if (dev_xmit_recursion()) { 2126 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); 2127 kfree_skb(skb); 2128 return -ENETDOWN; 2129 } 2130 2131 skb->dev = dev; 2132 skb_set_redirected_noclear(skb, skb_at_tc_ingress(skb)); 2133 skb_clear_tstamp(skb); 2134 2135 dev_xmit_recursion_inc(); 2136 ret = dev_queue_xmit(skb); 2137 dev_xmit_recursion_dec(); 2138 2139 return ret; 2140 } 2141 2142 static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev, 2143 u32 flags) 2144 { 2145 unsigned int mlen = skb_network_offset(skb); 2146 2147 if (unlikely(skb->len <= mlen)) { 2148 kfree_skb(skb); 2149 return -ERANGE; 2150 } 2151 2152 if (mlen) { 2153 __skb_pull(skb, mlen); 2154 2155 /* At ingress, the mac header has already been pulled once. 2156 * At egress, skb_pospull_rcsum has to be done in case that 2157 * the skb is originated from ingress (i.e. a forwarded skb) 2158 * to ensure that rcsum starts at net header. 2159 */ 2160 if (!skb_at_tc_ingress(skb)) 2161 skb_postpull_rcsum(skb, skb_mac_header(skb), mlen); 2162 } 2163 skb_pop_mac_header(skb); 2164 skb_reset_mac_len(skb); 2165 return flags & BPF_F_INGRESS ? 2166 __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb); 2167 } 2168 2169 static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev, 2170 u32 flags) 2171 { 2172 /* Verify that a link layer header is carried */ 2173 if (unlikely(skb->mac_header >= skb->network_header || skb->len == 0)) { 2174 kfree_skb(skb); 2175 return -ERANGE; 2176 } 2177 2178 bpf_push_mac_rcsum(skb); 2179 return flags & BPF_F_INGRESS ? 2180 __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb); 2181 } 2182 2183 static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev, 2184 u32 flags) 2185 { 2186 if (dev_is_mac_header_xmit(dev)) 2187 return __bpf_redirect_common(skb, dev, flags); 2188 else 2189 return __bpf_redirect_no_mac(skb, dev, flags); 2190 } 2191 2192 #if IS_ENABLED(CONFIG_IPV6) 2193 static int bpf_out_neigh_v6(struct net *net, struct sk_buff *skb, 2194 struct net_device *dev, struct bpf_nh_params *nh) 2195 { 2196 u32 hh_len = LL_RESERVED_SPACE(dev); 2197 const struct in6_addr *nexthop; 2198 struct dst_entry *dst = NULL; 2199 struct neighbour *neigh; 2200 2201 if (dev_xmit_recursion()) { 2202 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); 2203 goto out_drop; 2204 } 2205 2206 skb->dev = dev; 2207 skb_clear_tstamp(skb); 2208 2209 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { 2210 skb = skb_expand_head(skb, hh_len); 2211 if (!skb) 2212 return -ENOMEM; 2213 } 2214 2215 rcu_read_lock(); 2216 if (!nh) { 2217 dst = skb_dst(skb); 2218 nexthop = rt6_nexthop(container_of(dst, struct rt6_info, dst), 2219 &ipv6_hdr(skb)->daddr); 2220 } else { 2221 nexthop = &nh->ipv6_nh; 2222 } 2223 neigh = ip_neigh_gw6(dev, nexthop); 2224 if (likely(!IS_ERR(neigh))) { 2225 int ret; 2226 2227 sock_confirm_neigh(skb, neigh); 2228 local_bh_disable(); 2229 dev_xmit_recursion_inc(); 2230 ret = neigh_output(neigh, skb, false); 2231 dev_xmit_recursion_dec(); 2232 local_bh_enable(); 2233 rcu_read_unlock(); 2234 return ret; 2235 } 2236 rcu_read_unlock_bh(); 2237 if (dst) 2238 IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); 2239 out_drop: 2240 kfree_skb(skb); 2241 return -ENETDOWN; 2242 } 2243 2244 static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev, 2245 struct bpf_nh_params *nh) 2246 { 2247 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 2248 struct net *net = dev_net(dev); 2249 int err, ret = NET_XMIT_DROP; 2250 2251 if (!nh) { 2252 struct dst_entry *dst; 2253 struct flowi6 fl6 = { 2254 .flowi6_flags = FLOWI_FLAG_ANYSRC, 2255 .flowi6_mark = skb->mark, 2256 .flowlabel = ip6_flowinfo(ip6h), 2257 .flowi6_oif = dev->ifindex, 2258 .flowi6_proto = ip6h->nexthdr, 2259 .daddr = ip6h->daddr, 2260 .saddr = ip6h->saddr, 2261 }; 2262 2263 dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL); 2264 if (IS_ERR(dst)) 2265 goto out_drop; 2266 2267 skb_dst_set(skb, dst); 2268 } else if (nh->nh_family != AF_INET6) { 2269 goto out_drop; 2270 } 2271 2272 err = bpf_out_neigh_v6(net, skb, dev, nh); 2273 if (unlikely(net_xmit_eval(err))) 2274 dev->stats.tx_errors++; 2275 else 2276 ret = NET_XMIT_SUCCESS; 2277 goto out_xmit; 2278 out_drop: 2279 dev->stats.tx_errors++; 2280 kfree_skb(skb); 2281 out_xmit: 2282 return ret; 2283 } 2284 #else 2285 static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev, 2286 struct bpf_nh_params *nh) 2287 { 2288 kfree_skb(skb); 2289 return NET_XMIT_DROP; 2290 } 2291 #endif /* CONFIG_IPV6 */ 2292 2293 #if IS_ENABLED(CONFIG_INET) 2294 static int bpf_out_neigh_v4(struct net *net, struct sk_buff *skb, 2295 struct net_device *dev, struct bpf_nh_params *nh) 2296 { 2297 u32 hh_len = LL_RESERVED_SPACE(dev); 2298 struct neighbour *neigh; 2299 bool is_v6gw = false; 2300 2301 if (dev_xmit_recursion()) { 2302 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); 2303 goto out_drop; 2304 } 2305 2306 skb->dev = dev; 2307 skb_clear_tstamp(skb); 2308 2309 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { 2310 skb = skb_expand_head(skb, hh_len); 2311 if (!skb) 2312 return -ENOMEM; 2313 } 2314 2315 rcu_read_lock(); 2316 if (!nh) { 2317 struct dst_entry *dst = skb_dst(skb); 2318 struct rtable *rt = container_of(dst, struct rtable, dst); 2319 2320 neigh = ip_neigh_for_gw(rt, skb, &is_v6gw); 2321 } else if (nh->nh_family == AF_INET6) { 2322 neigh = ip_neigh_gw6(dev, &nh->ipv6_nh); 2323 is_v6gw = true; 2324 } else if (nh->nh_family == AF_INET) { 2325 neigh = ip_neigh_gw4(dev, nh->ipv4_nh); 2326 } else { 2327 rcu_read_unlock(); 2328 goto out_drop; 2329 } 2330 2331 if (likely(!IS_ERR(neigh))) { 2332 int ret; 2333 2334 sock_confirm_neigh(skb, neigh); 2335 local_bh_disable(); 2336 dev_xmit_recursion_inc(); 2337 ret = neigh_output(neigh, skb, is_v6gw); 2338 dev_xmit_recursion_dec(); 2339 local_bh_enable(); 2340 rcu_read_unlock(); 2341 return ret; 2342 } 2343 rcu_read_unlock(); 2344 out_drop: 2345 kfree_skb(skb); 2346 return -ENETDOWN; 2347 } 2348 2349 static int __bpf_redirect_neigh_v4(struct sk_buff *skb, struct net_device *dev, 2350 struct bpf_nh_params *nh) 2351 { 2352 const struct iphdr *ip4h = ip_hdr(skb); 2353 struct net *net = dev_net(dev); 2354 int err, ret = NET_XMIT_DROP; 2355 2356 if (!nh) { 2357 struct flowi4 fl4 = { 2358 .flowi4_flags = FLOWI_FLAG_ANYSRC, 2359 .flowi4_mark = skb->mark, 2360 .flowi4_tos = RT_TOS(ip4h->tos), 2361 .flowi4_oif = dev->ifindex, 2362 .flowi4_proto = ip4h->protocol, 2363 .daddr = ip4h->daddr, 2364 .saddr = ip4h->saddr, 2365 }; 2366 struct rtable *rt; 2367 2368 rt = ip_route_output_flow(net, &fl4, NULL); 2369 if (IS_ERR(rt)) 2370 goto out_drop; 2371 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { 2372 ip_rt_put(rt); 2373 goto out_drop; 2374 } 2375 2376 skb_dst_set(skb, &rt->dst); 2377 } 2378 2379 err = bpf_out_neigh_v4(net, skb, dev, nh); 2380 if (unlikely(net_xmit_eval(err))) 2381 dev->stats.tx_errors++; 2382 else 2383 ret = NET_XMIT_SUCCESS; 2384 goto out_xmit; 2385 out_drop: 2386 dev->stats.tx_errors++; 2387 kfree_skb(skb); 2388 out_xmit: 2389 return ret; 2390 } 2391 #else 2392 static int __bpf_redirect_neigh_v4(struct sk_buff *skb, struct net_device *dev, 2393 struct bpf_nh_params *nh) 2394 { 2395 kfree_skb(skb); 2396 return NET_XMIT_DROP; 2397 } 2398 #endif /* CONFIG_INET */ 2399 2400 static int __bpf_redirect_neigh(struct sk_buff *skb, struct net_device *dev, 2401 struct bpf_nh_params *nh) 2402 { 2403 struct ethhdr *ethh = eth_hdr(skb); 2404 2405 if (unlikely(skb->mac_header >= skb->network_header)) 2406 goto out; 2407 bpf_push_mac_rcsum(skb); 2408 if (is_multicast_ether_addr(ethh->h_dest)) 2409 goto out; 2410 2411 skb_pull(skb, sizeof(*ethh)); 2412 skb_unset_mac_header(skb); 2413 skb_reset_network_header(skb); 2414 2415 if (skb->protocol == htons(ETH_P_IP)) 2416 return __bpf_redirect_neigh_v4(skb, dev, nh); 2417 else if (skb->protocol == htons(ETH_P_IPV6)) 2418 return __bpf_redirect_neigh_v6(skb, dev, nh); 2419 out: 2420 kfree_skb(skb); 2421 return -ENOTSUPP; 2422 } 2423 2424 /* Internal, non-exposed redirect flags. */ 2425 enum { 2426 BPF_F_NEIGH = (1ULL << 1), 2427 BPF_F_PEER = (1ULL << 2), 2428 BPF_F_NEXTHOP = (1ULL << 3), 2429 #define BPF_F_REDIRECT_INTERNAL (BPF_F_NEIGH | BPF_F_PEER | BPF_F_NEXTHOP) 2430 }; 2431 2432 BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags) 2433 { 2434 struct net_device *dev; 2435 struct sk_buff *clone; 2436 int ret; 2437 2438 if (unlikely(flags & (~(BPF_F_INGRESS) | BPF_F_REDIRECT_INTERNAL))) 2439 return -EINVAL; 2440 2441 dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex); 2442 if (unlikely(!dev)) 2443 return -EINVAL; 2444 2445 clone = skb_clone(skb, GFP_ATOMIC); 2446 if (unlikely(!clone)) 2447 return -ENOMEM; 2448 2449 /* For direct write, we need to keep the invariant that the skbs 2450 * we're dealing with need to be uncloned. Should uncloning fail 2451 * here, we need to free the just generated clone to unclone once 2452 * again. 2453 */ 2454 ret = bpf_try_make_head_writable(skb); 2455 if (unlikely(ret)) { 2456 kfree_skb(clone); 2457 return -ENOMEM; 2458 } 2459 2460 return __bpf_redirect(clone, dev, flags); 2461 } 2462 2463 static const struct bpf_func_proto bpf_clone_redirect_proto = { 2464 .func = bpf_clone_redirect, 2465 .gpl_only = false, 2466 .ret_type = RET_INTEGER, 2467 .arg1_type = ARG_PTR_TO_CTX, 2468 .arg2_type = ARG_ANYTHING, 2469 .arg3_type = ARG_ANYTHING, 2470 }; 2471 2472 DEFINE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info); 2473 EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info); 2474 2475 static struct net_device *skb_get_peer_dev(struct net_device *dev) 2476 { 2477 const struct net_device_ops *ops = dev->netdev_ops; 2478 2479 if (likely(ops->ndo_get_peer_dev)) 2480 return INDIRECT_CALL_1(ops->ndo_get_peer_dev, 2481 netkit_peer_dev, dev); 2482 return NULL; 2483 } 2484 2485 int skb_do_redirect(struct sk_buff *skb) 2486 { 2487 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2488 struct net *net = dev_net(skb->dev); 2489 struct net_device *dev; 2490 u32 flags = ri->flags; 2491 2492 dev = dev_get_by_index_rcu(net, ri->tgt_index); 2493 ri->tgt_index = 0; 2494 ri->flags = 0; 2495 if (unlikely(!dev)) 2496 goto out_drop; 2497 if (flags & BPF_F_PEER) { 2498 if (unlikely(!skb_at_tc_ingress(skb))) 2499 goto out_drop; 2500 dev = skb_get_peer_dev(dev); 2501 if (unlikely(!dev || 2502 !(dev->flags & IFF_UP) || 2503 net_eq(net, dev_net(dev)))) 2504 goto out_drop; 2505 skb->dev = dev; 2506 dev_sw_netstats_rx_add(dev, skb->len); 2507 return -EAGAIN; 2508 } 2509 return flags & BPF_F_NEIGH ? 2510 __bpf_redirect_neigh(skb, dev, flags & BPF_F_NEXTHOP ? 2511 &ri->nh : NULL) : 2512 __bpf_redirect(skb, dev, flags); 2513 out_drop: 2514 kfree_skb(skb); 2515 return -EINVAL; 2516 } 2517 2518 BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags) 2519 { 2520 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2521 2522 if (unlikely(flags & (~(BPF_F_INGRESS) | BPF_F_REDIRECT_INTERNAL))) 2523 return TC_ACT_SHOT; 2524 2525 ri->flags = flags; 2526 ri->tgt_index = ifindex; 2527 2528 return TC_ACT_REDIRECT; 2529 } 2530 2531 static const struct bpf_func_proto bpf_redirect_proto = { 2532 .func = bpf_redirect, 2533 .gpl_only = false, 2534 .ret_type = RET_INTEGER, 2535 .arg1_type = ARG_ANYTHING, 2536 .arg2_type = ARG_ANYTHING, 2537 }; 2538 2539 BPF_CALL_2(bpf_redirect_peer, u32, ifindex, u64, flags) 2540 { 2541 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2542 2543 if (unlikely(flags)) 2544 return TC_ACT_SHOT; 2545 2546 ri->flags = BPF_F_PEER; 2547 ri->tgt_index = ifindex; 2548 2549 return TC_ACT_REDIRECT; 2550 } 2551 2552 static const struct bpf_func_proto bpf_redirect_peer_proto = { 2553 .func = bpf_redirect_peer, 2554 .gpl_only = false, 2555 .ret_type = RET_INTEGER, 2556 .arg1_type = ARG_ANYTHING, 2557 .arg2_type = ARG_ANYTHING, 2558 }; 2559 2560 BPF_CALL_4(bpf_redirect_neigh, u32, ifindex, struct bpf_redir_neigh *, params, 2561 int, plen, u64, flags) 2562 { 2563 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2564 2565 if (unlikely((plen && plen < sizeof(*params)) || flags)) 2566 return TC_ACT_SHOT; 2567 2568 ri->flags = BPF_F_NEIGH | (plen ? BPF_F_NEXTHOP : 0); 2569 ri->tgt_index = ifindex; 2570 2571 BUILD_BUG_ON(sizeof(struct bpf_redir_neigh) != sizeof(struct bpf_nh_params)); 2572 if (plen) 2573 memcpy(&ri->nh, params, sizeof(ri->nh)); 2574 2575 return TC_ACT_REDIRECT; 2576 } 2577 2578 static const struct bpf_func_proto bpf_redirect_neigh_proto = { 2579 .func = bpf_redirect_neigh, 2580 .gpl_only = false, 2581 .ret_type = RET_INTEGER, 2582 .arg1_type = ARG_ANYTHING, 2583 .arg2_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY, 2584 .arg3_type = ARG_CONST_SIZE_OR_ZERO, 2585 .arg4_type = ARG_ANYTHING, 2586 }; 2587 2588 BPF_CALL_2(bpf_msg_apply_bytes, struct sk_msg *, msg, u32, bytes) 2589 { 2590 msg->apply_bytes = bytes; 2591 return 0; 2592 } 2593 2594 static const struct bpf_func_proto bpf_msg_apply_bytes_proto = { 2595 .func = bpf_msg_apply_bytes, 2596 .gpl_only = false, 2597 .ret_type = RET_INTEGER, 2598 .arg1_type = ARG_PTR_TO_CTX, 2599 .arg2_type = ARG_ANYTHING, 2600 }; 2601 2602 BPF_CALL_2(bpf_msg_cork_bytes, struct sk_msg *, msg, u32, bytes) 2603 { 2604 msg->cork_bytes = bytes; 2605 return 0; 2606 } 2607 2608 static void sk_msg_reset_curr(struct sk_msg *msg) 2609 { 2610 u32 i = msg->sg.start; 2611 u32 len = 0; 2612 2613 do { 2614 len += sk_msg_elem(msg, i)->length; 2615 sk_msg_iter_var_next(i); 2616 if (len >= msg->sg.size) 2617 break; 2618 } while (i != msg->sg.end); 2619 2620 msg->sg.curr = i; 2621 msg->sg.copybreak = 0; 2622 } 2623 2624 static const struct bpf_func_proto bpf_msg_cork_bytes_proto = { 2625 .func = bpf_msg_cork_bytes, 2626 .gpl_only = false, 2627 .ret_type = RET_INTEGER, 2628 .arg1_type = ARG_PTR_TO_CTX, 2629 .arg2_type = ARG_ANYTHING, 2630 }; 2631 2632 BPF_CALL_4(bpf_msg_pull_data, struct sk_msg *, msg, u32, start, 2633 u32, end, u64, flags) 2634 { 2635 u32 len = 0, offset = 0, copy = 0, poffset = 0, bytes = end - start; 2636 u32 first_sge, last_sge, i, shift, bytes_sg_total; 2637 struct scatterlist *sge; 2638 u8 *raw, *to, *from; 2639 struct page *page; 2640 2641 if (unlikely(flags || end <= start)) 2642 return -EINVAL; 2643 2644 /* First find the starting scatterlist element */ 2645 i = msg->sg.start; 2646 do { 2647 offset += len; 2648 len = sk_msg_elem(msg, i)->length; 2649 if (start < offset + len) 2650 break; 2651 sk_msg_iter_var_next(i); 2652 } while (i != msg->sg.end); 2653 2654 if (unlikely(start >= offset + len)) 2655 return -EINVAL; 2656 2657 first_sge = i; 2658 /* The start may point into the sg element so we need to also 2659 * account for the headroom. 2660 */ 2661 bytes_sg_total = start - offset + bytes; 2662 if (!test_bit(i, msg->sg.copy) && bytes_sg_total <= len) 2663 goto out; 2664 2665 /* At this point we need to linearize multiple scatterlist 2666 * elements or a single shared page. Either way we need to 2667 * copy into a linear buffer exclusively owned by BPF. Then 2668 * place the buffer in the scatterlist and fixup the original 2669 * entries by removing the entries now in the linear buffer 2670 * and shifting the remaining entries. For now we do not try 2671 * to copy partial entries to avoid complexity of running out 2672 * of sg_entry slots. The downside is reading a single byte 2673 * will copy the entire sg entry. 2674 */ 2675 do { 2676 copy += sk_msg_elem(msg, i)->length; 2677 sk_msg_iter_var_next(i); 2678 if (bytes_sg_total <= copy) 2679 break; 2680 } while (i != msg->sg.end); 2681 last_sge = i; 2682 2683 if (unlikely(bytes_sg_total > copy)) 2684 return -EINVAL; 2685 2686 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, 2687 get_order(copy)); 2688 if (unlikely(!page)) 2689 return -ENOMEM; 2690 2691 raw = page_address(page); 2692 i = first_sge; 2693 do { 2694 sge = sk_msg_elem(msg, i); 2695 from = sg_virt(sge); 2696 len = sge->length; 2697 to = raw + poffset; 2698 2699 memcpy(to, from, len); 2700 poffset += len; 2701 sge->length = 0; 2702 put_page(sg_page(sge)); 2703 2704 sk_msg_iter_var_next(i); 2705 } while (i != last_sge); 2706 2707 sg_set_page(&msg->sg.data[first_sge], page, copy, 0); 2708 2709 /* To repair sg ring we need to shift entries. If we only 2710 * had a single entry though we can just replace it and 2711 * be done. Otherwise walk the ring and shift the entries. 2712 */ 2713 WARN_ON_ONCE(last_sge == first_sge); 2714 shift = last_sge > first_sge ? 2715 last_sge - first_sge - 1 : 2716 NR_MSG_FRAG_IDS - first_sge + last_sge - 1; 2717 if (!shift) 2718 goto out; 2719 2720 i = first_sge; 2721 sk_msg_iter_var_next(i); 2722 do { 2723 u32 move_from; 2724 2725 if (i + shift >= NR_MSG_FRAG_IDS) 2726 move_from = i + shift - NR_MSG_FRAG_IDS; 2727 else 2728 move_from = i + shift; 2729 if (move_from == msg->sg.end) 2730 break; 2731 2732 msg->sg.data[i] = msg->sg.data[move_from]; 2733 msg->sg.data[move_from].length = 0; 2734 msg->sg.data[move_from].page_link = 0; 2735 msg->sg.data[move_from].offset = 0; 2736 sk_msg_iter_var_next(i); 2737 } while (1); 2738 2739 msg->sg.end = msg->sg.end - shift > msg->sg.end ? 2740 msg->sg.end - shift + NR_MSG_FRAG_IDS : 2741 msg->sg.end - shift; 2742 out: 2743 sk_msg_reset_curr(msg); 2744 msg->data = sg_virt(&msg->sg.data[first_sge]) + start - offset; 2745 msg->data_end = msg->data + bytes; 2746 return 0; 2747 } 2748 2749 static const struct bpf_func_proto bpf_msg_pull_data_proto = { 2750 .func = bpf_msg_pull_data, 2751 .gpl_only = false, 2752 .ret_type = RET_INTEGER, 2753 .arg1_type = ARG_PTR_TO_CTX, 2754 .arg2_type = ARG_ANYTHING, 2755 .arg3_type = ARG_ANYTHING, 2756 .arg4_type = ARG_ANYTHING, 2757 }; 2758 2759 BPF_CALL_4(bpf_msg_push_data, struct sk_msg *, msg, u32, start, 2760 u32, len, u64, flags) 2761 { 2762 struct scatterlist sge, nsge, nnsge, rsge = {0}, *psge; 2763 u32 new, i = 0, l = 0, space, copy = 0, offset = 0; 2764 u8 *raw, *to, *from; 2765 struct page *page; 2766 2767 if (unlikely(flags)) 2768 return -EINVAL; 2769 2770 if (unlikely(len == 0)) 2771 return 0; 2772 2773 /* First find the starting scatterlist element */ 2774 i = msg->sg.start; 2775 do { 2776 offset += l; 2777 l = sk_msg_elem(msg, i)->length; 2778 2779 if (start < offset + l) 2780 break; 2781 sk_msg_iter_var_next(i); 2782 } while (i != msg->sg.end); 2783 2784 if (start >= offset + l) 2785 return -EINVAL; 2786 2787 space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); 2788 2789 /* If no space available will fallback to copy, we need at 2790 * least one scatterlist elem available to push data into 2791 * when start aligns to the beginning of an element or two 2792 * when it falls inside an element. We handle the start equals 2793 * offset case because its the common case for inserting a 2794 * header. 2795 */ 2796 if (!space || (space == 1 && start != offset)) 2797 copy = msg->sg.data[i].length; 2798 2799 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, 2800 get_order(copy + len)); 2801 if (unlikely(!page)) 2802 return -ENOMEM; 2803 2804 if (copy) { 2805 int front, back; 2806 2807 raw = page_address(page); 2808 2809 psge = sk_msg_elem(msg, i); 2810 front = start - offset; 2811 back = psge->length - front; 2812 from = sg_virt(psge); 2813 2814 if (front) 2815 memcpy(raw, from, front); 2816 2817 if (back) { 2818 from += front; 2819 to = raw + front + len; 2820 2821 memcpy(to, from, back); 2822 } 2823 2824 put_page(sg_page(psge)); 2825 } else if (start - offset) { 2826 psge = sk_msg_elem(msg, i); 2827 rsge = sk_msg_elem_cpy(msg, i); 2828 2829 psge->length = start - offset; 2830 rsge.length -= psge->length; 2831 rsge.offset += start; 2832 2833 sk_msg_iter_var_next(i); 2834 sg_unmark_end(psge); 2835 sg_unmark_end(&rsge); 2836 sk_msg_iter_next(msg, end); 2837 } 2838 2839 /* Slot(s) to place newly allocated data */ 2840 new = i; 2841 2842 /* Shift one or two slots as needed */ 2843 if (!copy) { 2844 sge = sk_msg_elem_cpy(msg, i); 2845 2846 sk_msg_iter_var_next(i); 2847 sg_unmark_end(&sge); 2848 sk_msg_iter_next(msg, end); 2849 2850 nsge = sk_msg_elem_cpy(msg, i); 2851 if (rsge.length) { 2852 sk_msg_iter_var_next(i); 2853 nnsge = sk_msg_elem_cpy(msg, i); 2854 } 2855 2856 while (i != msg->sg.end) { 2857 msg->sg.data[i] = sge; 2858 sge = nsge; 2859 sk_msg_iter_var_next(i); 2860 if (rsge.length) { 2861 nsge = nnsge; 2862 nnsge = sk_msg_elem_cpy(msg, i); 2863 } else { 2864 nsge = sk_msg_elem_cpy(msg, i); 2865 } 2866 } 2867 } 2868 2869 /* Place newly allocated data buffer */ 2870 sk_mem_charge(msg->sk, len); 2871 msg->sg.size += len; 2872 __clear_bit(new, msg->sg.copy); 2873 sg_set_page(&msg->sg.data[new], page, len + copy, 0); 2874 if (rsge.length) { 2875 get_page(sg_page(&rsge)); 2876 sk_msg_iter_var_next(new); 2877 msg->sg.data[new] = rsge; 2878 } 2879 2880 sk_msg_reset_curr(msg); 2881 sk_msg_compute_data_pointers(msg); 2882 return 0; 2883 } 2884 2885 static const struct bpf_func_proto bpf_msg_push_data_proto = { 2886 .func = bpf_msg_push_data, 2887 .gpl_only = false, 2888 .ret_type = RET_INTEGER, 2889 .arg1_type = ARG_PTR_TO_CTX, 2890 .arg2_type = ARG_ANYTHING, 2891 .arg3_type = ARG_ANYTHING, 2892 .arg4_type = ARG_ANYTHING, 2893 }; 2894 2895 static void sk_msg_shift_left(struct sk_msg *msg, int i) 2896 { 2897 int prev; 2898 2899 do { 2900 prev = i; 2901 sk_msg_iter_var_next(i); 2902 msg->sg.data[prev] = msg->sg.data[i]; 2903 } while (i != msg->sg.end); 2904 2905 sk_msg_iter_prev(msg, end); 2906 } 2907 2908 static void sk_msg_shift_right(struct sk_msg *msg, int i) 2909 { 2910 struct scatterlist tmp, sge; 2911 2912 sk_msg_iter_next(msg, end); 2913 sge = sk_msg_elem_cpy(msg, i); 2914 sk_msg_iter_var_next(i); 2915 tmp = sk_msg_elem_cpy(msg, i); 2916 2917 while (i != msg->sg.end) { 2918 msg->sg.data[i] = sge; 2919 sk_msg_iter_var_next(i); 2920 sge = tmp; 2921 tmp = sk_msg_elem_cpy(msg, i); 2922 } 2923 } 2924 2925 BPF_CALL_4(bpf_msg_pop_data, struct sk_msg *, msg, u32, start, 2926 u32, len, u64, flags) 2927 { 2928 u32 i = 0, l = 0, space, offset = 0; 2929 u64 last = start + len; 2930 int pop; 2931 2932 if (unlikely(flags)) 2933 return -EINVAL; 2934 2935 /* First find the starting scatterlist element */ 2936 i = msg->sg.start; 2937 do { 2938 offset += l; 2939 l = sk_msg_elem(msg, i)->length; 2940 2941 if (start < offset + l) 2942 break; 2943 sk_msg_iter_var_next(i); 2944 } while (i != msg->sg.end); 2945 2946 /* Bounds checks: start and pop must be inside message */ 2947 if (start >= offset + l || last >= msg->sg.size) 2948 return -EINVAL; 2949 2950 space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); 2951 2952 pop = len; 2953 /* --------------| offset 2954 * -| start |-------- len -------| 2955 * 2956 * |----- a ----|-------- pop -------|----- b ----| 2957 * |______________________________________________| length 2958 * 2959 * 2960 * a: region at front of scatter element to save 2961 * b: region at back of scatter element to save when length > A + pop 2962 * pop: region to pop from element, same as input 'pop' here will be 2963 * decremented below per iteration. 2964 * 2965 * Two top-level cases to handle when start != offset, first B is non 2966 * zero and second B is zero corresponding to when a pop includes more 2967 * than one element. 2968 * 2969 * Then if B is non-zero AND there is no space allocate space and 2970 * compact A, B regions into page. If there is space shift ring to 2971 * the rigth free'ing the next element in ring to place B, leaving 2972 * A untouched except to reduce length. 2973 */ 2974 if (start != offset) { 2975 struct scatterlist *nsge, *sge = sk_msg_elem(msg, i); 2976 int a = start; 2977 int b = sge->length - pop - a; 2978 2979 sk_msg_iter_var_next(i); 2980 2981 if (pop < sge->length - a) { 2982 if (space) { 2983 sge->length = a; 2984 sk_msg_shift_right(msg, i); 2985 nsge = sk_msg_elem(msg, i); 2986 get_page(sg_page(sge)); 2987 sg_set_page(nsge, 2988 sg_page(sge), 2989 b, sge->offset + pop + a); 2990 } else { 2991 struct page *page, *orig; 2992 u8 *to, *from; 2993 2994 page = alloc_pages(__GFP_NOWARN | 2995 __GFP_COMP | GFP_ATOMIC, 2996 get_order(a + b)); 2997 if (unlikely(!page)) 2998 return -ENOMEM; 2999 3000 sge->length = a; 3001 orig = sg_page(sge); 3002 from = sg_virt(sge); 3003 to = page_address(page); 3004 memcpy(to, from, a); 3005 memcpy(to + a, from + a + pop, b); 3006 sg_set_page(sge, page, a + b, 0); 3007 put_page(orig); 3008 } 3009 pop = 0; 3010 } else if (pop >= sge->length - a) { 3011 pop -= (sge->length - a); 3012 sge->length = a; 3013 } 3014 } 3015 3016 /* From above the current layout _must_ be as follows, 3017 * 3018 * -| offset 3019 * -| start 3020 * 3021 * |---- pop ---|---------------- b ------------| 3022 * |____________________________________________| length 3023 * 3024 * Offset and start of the current msg elem are equal because in the 3025 * previous case we handled offset != start and either consumed the 3026 * entire element and advanced to the next element OR pop == 0. 3027 * 3028 * Two cases to handle here are first pop is less than the length 3029 * leaving some remainder b above. Simply adjust the element's layout 3030 * in this case. Or pop >= length of the element so that b = 0. In this 3031 * case advance to next element decrementing pop. 3032 */ 3033 while (pop) { 3034 struct scatterlist *sge = sk_msg_elem(msg, i); 3035 3036 if (pop < sge->length) { 3037 sge->length -= pop; 3038 sge->offset += pop; 3039 pop = 0; 3040 } else { 3041 pop -= sge->length; 3042 sk_msg_shift_left(msg, i); 3043 } 3044 sk_msg_iter_var_next(i); 3045 } 3046 3047 sk_mem_uncharge(msg->sk, len - pop); 3048 msg->sg.size -= (len - pop); 3049 sk_msg_reset_curr(msg); 3050 sk_msg_compute_data_pointers(msg); 3051 return 0; 3052 } 3053 3054 static const struct bpf_func_proto bpf_msg_pop_data_proto = { 3055 .func = bpf_msg_pop_data, 3056 .gpl_only = false, 3057 .ret_type = RET_INTEGER, 3058 .arg1_type = ARG_PTR_TO_CTX, 3059 .arg2_type = ARG_ANYTHING, 3060 .arg3_type = ARG_ANYTHING, 3061 .arg4_type = ARG_ANYTHING, 3062 }; 3063 3064 #ifdef CONFIG_CGROUP_NET_CLASSID 3065 BPF_CALL_0(bpf_get_cgroup_classid_curr) 3066 { 3067 return __task_get_classid(current); 3068 } 3069 3070 const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto = { 3071 .func = bpf_get_cgroup_classid_curr, 3072 .gpl_only = false, 3073 .ret_type = RET_INTEGER, 3074 }; 3075 3076 BPF_CALL_1(bpf_skb_cgroup_classid, const struct sk_buff *, skb) 3077 { 3078 struct sock *sk = skb_to_full_sk(skb); 3079 3080 if (!sk || !sk_fullsock(sk)) 3081 return 0; 3082 3083 return sock_cgroup_classid(&sk->sk_cgrp_data); 3084 } 3085 3086 static const struct bpf_func_proto bpf_skb_cgroup_classid_proto = { 3087 .func = bpf_skb_cgroup_classid, 3088 .gpl_only = false, 3089 .ret_type = RET_INTEGER, 3090 .arg1_type = ARG_PTR_TO_CTX, 3091 }; 3092 #endif 3093 3094 BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb) 3095 { 3096 return task_get_classid(skb); 3097 } 3098 3099 static const struct bpf_func_proto bpf_get_cgroup_classid_proto = { 3100 .func = bpf_get_cgroup_classid, 3101 .gpl_only = false, 3102 .ret_type = RET_INTEGER, 3103 .arg1_type = ARG_PTR_TO_CTX, 3104 }; 3105 3106 BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb) 3107 { 3108 return dst_tclassid(skb); 3109 } 3110 3111 static const struct bpf_func_proto bpf_get_route_realm_proto = { 3112 .func = bpf_get_route_realm, 3113 .gpl_only = false, 3114 .ret_type = RET_INTEGER, 3115 .arg1_type = ARG_PTR_TO_CTX, 3116 }; 3117 3118 BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb) 3119 { 3120 /* If skb_clear_hash() was called due to mangling, we can 3121 * trigger SW recalculation here. Later access to hash 3122 * can then use the inline skb->hash via context directly 3123 * instead of calling this helper again. 3124 */ 3125 return skb_get_hash(skb); 3126 } 3127 3128 static const struct bpf_func_proto bpf_get_hash_recalc_proto = { 3129 .func = bpf_get_hash_recalc, 3130 .gpl_only = false, 3131 .ret_type = RET_INTEGER, 3132 .arg1_type = ARG_PTR_TO_CTX, 3133 }; 3134 3135 BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb) 3136 { 3137 /* After all direct packet write, this can be used once for 3138 * triggering a lazy recalc on next skb_get_hash() invocation. 3139 */ 3140 skb_clear_hash(skb); 3141 return 0; 3142 } 3143 3144 static const struct bpf_func_proto bpf_set_hash_invalid_proto = { 3145 .func = bpf_set_hash_invalid, 3146 .gpl_only = false, 3147 .ret_type = RET_INTEGER, 3148 .arg1_type = ARG_PTR_TO_CTX, 3149 }; 3150 3151 BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash) 3152 { 3153 /* Set user specified hash as L4(+), so that it gets returned 3154 * on skb_get_hash() call unless BPF prog later on triggers a 3155 * skb_clear_hash(). 3156 */ 3157 __skb_set_sw_hash(skb, hash, true); 3158 return 0; 3159 } 3160 3161 static const struct bpf_func_proto bpf_set_hash_proto = { 3162 .func = bpf_set_hash, 3163 .gpl_only = false, 3164 .ret_type = RET_INTEGER, 3165 .arg1_type = ARG_PTR_TO_CTX, 3166 .arg2_type = ARG_ANYTHING, 3167 }; 3168 3169 BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto, 3170 u16, vlan_tci) 3171 { 3172 int ret; 3173 3174 if (unlikely(vlan_proto != htons(ETH_P_8021Q) && 3175 vlan_proto != htons(ETH_P_8021AD))) 3176 vlan_proto = htons(ETH_P_8021Q); 3177 3178 bpf_push_mac_rcsum(skb); 3179 ret = skb_vlan_push(skb, vlan_proto, vlan_tci); 3180 bpf_pull_mac_rcsum(skb); 3181 3182 bpf_compute_data_pointers(skb); 3183 return ret; 3184 } 3185 3186 static const struct bpf_func_proto bpf_skb_vlan_push_proto = { 3187 .func = bpf_skb_vlan_push, 3188 .gpl_only = false, 3189 .ret_type = RET_INTEGER, 3190 .arg1_type = ARG_PTR_TO_CTX, 3191 .arg2_type = ARG_ANYTHING, 3192 .arg3_type = ARG_ANYTHING, 3193 }; 3194 3195 BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb) 3196 { 3197 int ret; 3198 3199 bpf_push_mac_rcsum(skb); 3200 ret = skb_vlan_pop(skb); 3201 bpf_pull_mac_rcsum(skb); 3202 3203 bpf_compute_data_pointers(skb); 3204 return ret; 3205 } 3206 3207 static const struct bpf_func_proto bpf_skb_vlan_pop_proto = { 3208 .func = bpf_skb_vlan_pop, 3209 .gpl_only = false, 3210 .ret_type = RET_INTEGER, 3211 .arg1_type = ARG_PTR_TO_CTX, 3212 }; 3213 3214 static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len) 3215 { 3216 /* Caller already did skb_cow() with len as headroom, 3217 * so no need to do it here. 3218 */ 3219 skb_push(skb, len); 3220 memmove(skb->data, skb->data + len, off); 3221 memset(skb->data + off, 0, len); 3222 3223 /* No skb_postpush_rcsum(skb, skb->data + off, len) 3224 * needed here as it does not change the skb->csum 3225 * result for checksum complete when summing over 3226 * zeroed blocks. 3227 */ 3228 return 0; 3229 } 3230 3231 static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len) 3232 { 3233 void *old_data; 3234 3235 /* skb_ensure_writable() is not needed here, as we're 3236 * already working on an uncloned skb. 3237 */ 3238 if (unlikely(!pskb_may_pull(skb, off + len))) 3239 return -ENOMEM; 3240 3241 old_data = skb->data; 3242 __skb_pull(skb, len); 3243 skb_postpull_rcsum(skb, old_data + off, len); 3244 memmove(skb->data, old_data, off); 3245 3246 return 0; 3247 } 3248 3249 static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len) 3250 { 3251 bool trans_same = skb->transport_header == skb->network_header; 3252 int ret; 3253 3254 /* There's no need for __skb_push()/__skb_pull() pair to 3255 * get to the start of the mac header as we're guaranteed 3256 * to always start from here under eBPF. 3257 */ 3258 ret = bpf_skb_generic_push(skb, off, len); 3259 if (likely(!ret)) { 3260 skb->mac_header -= len; 3261 skb->network_header -= len; 3262 if (trans_same) 3263 skb->transport_header = skb->network_header; 3264 } 3265 3266 return ret; 3267 } 3268 3269 static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len) 3270 { 3271 bool trans_same = skb->transport_header == skb->network_header; 3272 int ret; 3273 3274 /* Same here, __skb_push()/__skb_pull() pair not needed. */ 3275 ret = bpf_skb_generic_pop(skb, off, len); 3276 if (likely(!ret)) { 3277 skb->mac_header += len; 3278 skb->network_header += len; 3279 if (trans_same) 3280 skb->transport_header = skb->network_header; 3281 } 3282 3283 return ret; 3284 } 3285 3286 static int bpf_skb_proto_4_to_6(struct sk_buff *skb) 3287 { 3288 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); 3289 u32 off = skb_mac_header_len(skb); 3290 int ret; 3291 3292 ret = skb_cow(skb, len_diff); 3293 if (unlikely(ret < 0)) 3294 return ret; 3295 3296 ret = bpf_skb_net_hdr_push(skb, off, len_diff); 3297 if (unlikely(ret < 0)) 3298 return ret; 3299 3300 if (skb_is_gso(skb)) { 3301 struct skb_shared_info *shinfo = skb_shinfo(skb); 3302 3303 /* SKB_GSO_TCPV4 needs to be changed into SKB_GSO_TCPV6. */ 3304 if (shinfo->gso_type & SKB_GSO_TCPV4) { 3305 shinfo->gso_type &= ~SKB_GSO_TCPV4; 3306 shinfo->gso_type |= SKB_GSO_TCPV6; 3307 } 3308 } 3309 3310 skb->protocol = htons(ETH_P_IPV6); 3311 skb_clear_hash(skb); 3312 3313 return 0; 3314 } 3315 3316 static int bpf_skb_proto_6_to_4(struct sk_buff *skb) 3317 { 3318 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); 3319 u32 off = skb_mac_header_len(skb); 3320 int ret; 3321 3322 ret = skb_unclone(skb, GFP_ATOMIC); 3323 if (unlikely(ret < 0)) 3324 return ret; 3325 3326 ret = bpf_skb_net_hdr_pop(skb, off, len_diff); 3327 if (unlikely(ret < 0)) 3328 return ret; 3329 3330 if (skb_is_gso(skb)) { 3331 struct skb_shared_info *shinfo = skb_shinfo(skb); 3332 3333 /* SKB_GSO_TCPV6 needs to be changed into SKB_GSO_TCPV4. */ 3334 if (shinfo->gso_type & SKB_GSO_TCPV6) { 3335 shinfo->gso_type &= ~SKB_GSO_TCPV6; 3336 shinfo->gso_type |= SKB_GSO_TCPV4; 3337 } 3338 } 3339 3340 skb->protocol = htons(ETH_P_IP); 3341 skb_clear_hash(skb); 3342 3343 return 0; 3344 } 3345 3346 static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto) 3347 { 3348 __be16 from_proto = skb->protocol; 3349 3350 if (from_proto == htons(ETH_P_IP) && 3351 to_proto == htons(ETH_P_IPV6)) 3352 return bpf_skb_proto_4_to_6(skb); 3353 3354 if (from_proto == htons(ETH_P_IPV6) && 3355 to_proto == htons(ETH_P_IP)) 3356 return bpf_skb_proto_6_to_4(skb); 3357 3358 return -ENOTSUPP; 3359 } 3360 3361 BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto, 3362 u64, flags) 3363 { 3364 int ret; 3365 3366 if (unlikely(flags)) 3367 return -EINVAL; 3368 3369 /* General idea is that this helper does the basic groundwork 3370 * needed for changing the protocol, and eBPF program fills the 3371 * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace() 3372 * and other helpers, rather than passing a raw buffer here. 3373 * 3374 * The rationale is to keep this minimal and without a need to 3375 * deal with raw packet data. F.e. even if we would pass buffers 3376 * here, the program still needs to call the bpf_lX_csum_replace() 3377 * helpers anyway. Plus, this way we keep also separation of 3378 * concerns, since f.e. bpf_skb_store_bytes() should only take 3379 * care of stores. 3380 * 3381 * Currently, additional options and extension header space are 3382 * not supported, but flags register is reserved so we can adapt 3383 * that. For offloads, we mark packet as dodgy, so that headers 3384 * need to be verified first. 3385 */ 3386 ret = bpf_skb_proto_xlat(skb, proto); 3387 bpf_compute_data_pointers(skb); 3388 return ret; 3389 } 3390 3391 static const struct bpf_func_proto bpf_skb_change_proto_proto = { 3392 .func = bpf_skb_change_proto, 3393 .gpl_only = false, 3394 .ret_type = RET_INTEGER, 3395 .arg1_type = ARG_PTR_TO_CTX, 3396 .arg2_type = ARG_ANYTHING, 3397 .arg3_type = ARG_ANYTHING, 3398 }; 3399 3400 BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type) 3401 { 3402 /* We only allow a restricted subset to be changed for now. */ 3403 if (unlikely(!skb_pkt_type_ok(skb->pkt_type) || 3404 !skb_pkt_type_ok(pkt_type))) 3405 return -EINVAL; 3406 3407 skb->pkt_type = pkt_type; 3408 return 0; 3409 } 3410 3411 static const struct bpf_func_proto bpf_skb_change_type_proto = { 3412 .func = bpf_skb_change_type, 3413 .gpl_only = false, 3414 .ret_type = RET_INTEGER, 3415 .arg1_type = ARG_PTR_TO_CTX, 3416 .arg2_type = ARG_ANYTHING, 3417 }; 3418 3419 static u32 bpf_skb_net_base_len(const struct sk_buff *skb) 3420 { 3421 switch (skb->protocol) { 3422 case htons(ETH_P_IP): 3423 return sizeof(struct iphdr); 3424 case htons(ETH_P_IPV6): 3425 return sizeof(struct ipv6hdr); 3426 default: 3427 return ~0U; 3428 } 3429 } 3430 3431 #define BPF_F_ADJ_ROOM_ENCAP_L3_MASK (BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 | \ 3432 BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3433 3434 #define BPF_F_ADJ_ROOM_DECAP_L3_MASK (BPF_F_ADJ_ROOM_DECAP_L3_IPV4 | \ 3435 BPF_F_ADJ_ROOM_DECAP_L3_IPV6) 3436 3437 #define BPF_F_ADJ_ROOM_MASK (BPF_F_ADJ_ROOM_FIXED_GSO | \ 3438 BPF_F_ADJ_ROOM_ENCAP_L3_MASK | \ 3439 BPF_F_ADJ_ROOM_ENCAP_L4_GRE | \ 3440 BPF_F_ADJ_ROOM_ENCAP_L4_UDP | \ 3441 BPF_F_ADJ_ROOM_ENCAP_L2_ETH | \ 3442 BPF_F_ADJ_ROOM_ENCAP_L2( \ 3443 BPF_ADJ_ROOM_ENCAP_L2_MASK) | \ 3444 BPF_F_ADJ_ROOM_DECAP_L3_MASK) 3445 3446 static int bpf_skb_net_grow(struct sk_buff *skb, u32 off, u32 len_diff, 3447 u64 flags) 3448 { 3449 u8 inner_mac_len = flags >> BPF_ADJ_ROOM_ENCAP_L2_SHIFT; 3450 bool encap = flags & BPF_F_ADJ_ROOM_ENCAP_L3_MASK; 3451 u16 mac_len = 0, inner_net = 0, inner_trans = 0; 3452 unsigned int gso_type = SKB_GSO_DODGY; 3453 int ret; 3454 3455 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { 3456 /* udp gso_size delineates datagrams, only allow if fixed */ 3457 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || 3458 !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3459 return -ENOTSUPP; 3460 } 3461 3462 ret = skb_cow_head(skb, len_diff); 3463 if (unlikely(ret < 0)) 3464 return ret; 3465 3466 if (encap) { 3467 if (skb->protocol != htons(ETH_P_IP) && 3468 skb->protocol != htons(ETH_P_IPV6)) 3469 return -ENOTSUPP; 3470 3471 if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 && 3472 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3473 return -EINVAL; 3474 3475 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE && 3476 flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) 3477 return -EINVAL; 3478 3479 if (flags & BPF_F_ADJ_ROOM_ENCAP_L2_ETH && 3480 inner_mac_len < ETH_HLEN) 3481 return -EINVAL; 3482 3483 if (skb->encapsulation) 3484 return -EALREADY; 3485 3486 mac_len = skb->network_header - skb->mac_header; 3487 inner_net = skb->network_header; 3488 if (inner_mac_len > len_diff) 3489 return -EINVAL; 3490 inner_trans = skb->transport_header; 3491 } 3492 3493 ret = bpf_skb_net_hdr_push(skb, off, len_diff); 3494 if (unlikely(ret < 0)) 3495 return ret; 3496 3497 if (encap) { 3498 skb->inner_mac_header = inner_net - inner_mac_len; 3499 skb->inner_network_header = inner_net; 3500 skb->inner_transport_header = inner_trans; 3501 3502 if (flags & BPF_F_ADJ_ROOM_ENCAP_L2_ETH) 3503 skb_set_inner_protocol(skb, htons(ETH_P_TEB)); 3504 else 3505 skb_set_inner_protocol(skb, skb->protocol); 3506 3507 skb->encapsulation = 1; 3508 skb_set_network_header(skb, mac_len); 3509 3510 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) 3511 gso_type |= SKB_GSO_UDP_TUNNEL; 3512 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE) 3513 gso_type |= SKB_GSO_GRE; 3514 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3515 gso_type |= SKB_GSO_IPXIP6; 3516 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) 3517 gso_type |= SKB_GSO_IPXIP4; 3518 3519 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE || 3520 flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) { 3521 int nh_len = flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6 ? 3522 sizeof(struct ipv6hdr) : 3523 sizeof(struct iphdr); 3524 3525 skb_set_transport_header(skb, mac_len + nh_len); 3526 } 3527 3528 /* Match skb->protocol to new outer l3 protocol */ 3529 if (skb->protocol == htons(ETH_P_IP) && 3530 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3531 skb->protocol = htons(ETH_P_IPV6); 3532 else if (skb->protocol == htons(ETH_P_IPV6) && 3533 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) 3534 skb->protocol = htons(ETH_P_IP); 3535 } 3536 3537 if (skb_is_gso(skb)) { 3538 struct skb_shared_info *shinfo = skb_shinfo(skb); 3539 3540 /* Due to header grow, MSS needs to be downgraded. */ 3541 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3542 skb_decrease_gso_size(shinfo, len_diff); 3543 3544 /* Header must be checked, and gso_segs recomputed. */ 3545 shinfo->gso_type |= gso_type; 3546 shinfo->gso_segs = 0; 3547 } 3548 3549 return 0; 3550 } 3551 3552 static int bpf_skb_net_shrink(struct sk_buff *skb, u32 off, u32 len_diff, 3553 u64 flags) 3554 { 3555 int ret; 3556 3557 if (unlikely(flags & ~(BPF_F_ADJ_ROOM_FIXED_GSO | 3558 BPF_F_ADJ_ROOM_DECAP_L3_MASK | 3559 BPF_F_ADJ_ROOM_NO_CSUM_RESET))) 3560 return -EINVAL; 3561 3562 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { 3563 /* udp gso_size delineates datagrams, only allow if fixed */ 3564 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || 3565 !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3566 return -ENOTSUPP; 3567 } 3568 3569 ret = skb_unclone(skb, GFP_ATOMIC); 3570 if (unlikely(ret < 0)) 3571 return ret; 3572 3573 ret = bpf_skb_net_hdr_pop(skb, off, len_diff); 3574 if (unlikely(ret < 0)) 3575 return ret; 3576 3577 /* Match skb->protocol to new outer l3 protocol */ 3578 if (skb->protocol == htons(ETH_P_IP) && 3579 flags & BPF_F_ADJ_ROOM_DECAP_L3_IPV6) 3580 skb->protocol = htons(ETH_P_IPV6); 3581 else if (skb->protocol == htons(ETH_P_IPV6) && 3582 flags & BPF_F_ADJ_ROOM_DECAP_L3_IPV4) 3583 skb->protocol = htons(ETH_P_IP); 3584 3585 if (skb_is_gso(skb)) { 3586 struct skb_shared_info *shinfo = skb_shinfo(skb); 3587 3588 /* Due to header shrink, MSS can be upgraded. */ 3589 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3590 skb_increase_gso_size(shinfo, len_diff); 3591 3592 /* Header must be checked, and gso_segs recomputed. */ 3593 shinfo->gso_type |= SKB_GSO_DODGY; 3594 shinfo->gso_segs = 0; 3595 } 3596 3597 return 0; 3598 } 3599 3600 #define BPF_SKB_MAX_LEN SKB_MAX_ALLOC 3601 3602 BPF_CALL_4(sk_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, 3603 u32, mode, u64, flags) 3604 { 3605 u32 len_diff_abs = abs(len_diff); 3606 bool shrink = len_diff < 0; 3607 int ret = 0; 3608 3609 if (unlikely(flags || mode)) 3610 return -EINVAL; 3611 if (unlikely(len_diff_abs > 0xfffU)) 3612 return -EFAULT; 3613 3614 if (!shrink) { 3615 ret = skb_cow(skb, len_diff); 3616 if (unlikely(ret < 0)) 3617 return ret; 3618 __skb_push(skb, len_diff_abs); 3619 memset(skb->data, 0, len_diff_abs); 3620 } else { 3621 if (unlikely(!pskb_may_pull(skb, len_diff_abs))) 3622 return -ENOMEM; 3623 __skb_pull(skb, len_diff_abs); 3624 } 3625 if (tls_sw_has_ctx_rx(skb->sk)) { 3626 struct strp_msg *rxm = strp_msg(skb); 3627 3628 rxm->full_len += len_diff; 3629 } 3630 return ret; 3631 } 3632 3633 static const struct bpf_func_proto sk_skb_adjust_room_proto = { 3634 .func = sk_skb_adjust_room, 3635 .gpl_only = false, 3636 .ret_type = RET_INTEGER, 3637 .arg1_type = ARG_PTR_TO_CTX, 3638 .arg2_type = ARG_ANYTHING, 3639 .arg3_type = ARG_ANYTHING, 3640 .arg4_type = ARG_ANYTHING, 3641 }; 3642 3643 BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, 3644 u32, mode, u64, flags) 3645 { 3646 u32 len_cur, len_diff_abs = abs(len_diff); 3647 u32 len_min = bpf_skb_net_base_len(skb); 3648 u32 len_max = BPF_SKB_MAX_LEN; 3649 __be16 proto = skb->protocol; 3650 bool shrink = len_diff < 0; 3651 u32 off; 3652 int ret; 3653 3654 if (unlikely(flags & ~(BPF_F_ADJ_ROOM_MASK | 3655 BPF_F_ADJ_ROOM_NO_CSUM_RESET))) 3656 return -EINVAL; 3657 if (unlikely(len_diff_abs > 0xfffU)) 3658 return -EFAULT; 3659 if (unlikely(proto != htons(ETH_P_IP) && 3660 proto != htons(ETH_P_IPV6))) 3661 return -ENOTSUPP; 3662 3663 off = skb_mac_header_len(skb); 3664 switch (mode) { 3665 case BPF_ADJ_ROOM_NET: 3666 off += bpf_skb_net_base_len(skb); 3667 break; 3668 case BPF_ADJ_ROOM_MAC: 3669 break; 3670 default: 3671 return -ENOTSUPP; 3672 } 3673 3674 if (flags & BPF_F_ADJ_ROOM_DECAP_L3_MASK) { 3675 if (!shrink) 3676 return -EINVAL; 3677 3678 switch (flags & BPF_F_ADJ_ROOM_DECAP_L3_MASK) { 3679 case BPF_F_ADJ_ROOM_DECAP_L3_IPV4: 3680 len_min = sizeof(struct iphdr); 3681 break; 3682 case BPF_F_ADJ_ROOM_DECAP_L3_IPV6: 3683 len_min = sizeof(struct ipv6hdr); 3684 break; 3685 default: 3686 return -EINVAL; 3687 } 3688 } 3689 3690 len_cur = skb->len - skb_network_offset(skb); 3691 if ((shrink && (len_diff_abs >= len_cur || 3692 len_cur - len_diff_abs < len_min)) || 3693 (!shrink && (skb->len + len_diff_abs > len_max && 3694 !skb_is_gso(skb)))) 3695 return -ENOTSUPP; 3696 3697 ret = shrink ? bpf_skb_net_shrink(skb, off, len_diff_abs, flags) : 3698 bpf_skb_net_grow(skb, off, len_diff_abs, flags); 3699 if (!ret && !(flags & BPF_F_ADJ_ROOM_NO_CSUM_RESET)) 3700 __skb_reset_checksum_unnecessary(skb); 3701 3702 bpf_compute_data_pointers(skb); 3703 return ret; 3704 } 3705 3706 static const struct bpf_func_proto bpf_skb_adjust_room_proto = { 3707 .func = bpf_skb_adjust_room, 3708 .gpl_only = false, 3709 .ret_type = RET_INTEGER, 3710 .arg1_type = ARG_PTR_TO_CTX, 3711 .arg2_type = ARG_ANYTHING, 3712 .arg3_type = ARG_ANYTHING, 3713 .arg4_type = ARG_ANYTHING, 3714 }; 3715 3716 static u32 __bpf_skb_min_len(const struct sk_buff *skb) 3717 { 3718 u32 min_len = skb_network_offset(skb); 3719 3720 if (skb_transport_header_was_set(skb)) 3721 min_len = skb_transport_offset(skb); 3722 if (skb->ip_summed == CHECKSUM_PARTIAL) 3723 min_len = skb_checksum_start_offset(skb) + 3724 skb->csum_offset + sizeof(__sum16); 3725 return min_len; 3726 } 3727 3728 static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len) 3729 { 3730 unsigned int old_len = skb->len; 3731 int ret; 3732 3733 ret = __skb_grow_rcsum(skb, new_len); 3734 if (!ret) 3735 memset(skb->data + old_len, 0, new_len - old_len); 3736 return ret; 3737 } 3738 3739 static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len) 3740 { 3741 return __skb_trim_rcsum(skb, new_len); 3742 } 3743 3744 static inline int __bpf_skb_change_tail(struct sk_buff *skb, u32 new_len, 3745 u64 flags) 3746 { 3747 u32 max_len = BPF_SKB_MAX_LEN; 3748 u32 min_len = __bpf_skb_min_len(skb); 3749 int ret; 3750 3751 if (unlikely(flags || new_len > max_len || new_len < min_len)) 3752 return -EINVAL; 3753 if (skb->encapsulation) 3754 return -ENOTSUPP; 3755 3756 /* The basic idea of this helper is that it's performing the 3757 * needed work to either grow or trim an skb, and eBPF program 3758 * rewrites the rest via helpers like bpf_skb_store_bytes(), 3759 * bpf_lX_csum_replace() and others rather than passing a raw 3760 * buffer here. This one is a slow path helper and intended 3761 * for replies with control messages. 3762 * 3763 * Like in bpf_skb_change_proto(), we want to keep this rather 3764 * minimal and without protocol specifics so that we are able 3765 * to separate concerns as in bpf_skb_store_bytes() should only 3766 * be the one responsible for writing buffers. 3767 * 3768 * It's really expected to be a slow path operation here for 3769 * control message replies, so we're implicitly linearizing, 3770 * uncloning and drop offloads from the skb by this. 3771 */ 3772 ret = __bpf_try_make_writable(skb, skb->len); 3773 if (!ret) { 3774 if (new_len > skb->len) 3775 ret = bpf_skb_grow_rcsum(skb, new_len); 3776 else if (new_len < skb->len) 3777 ret = bpf_skb_trim_rcsum(skb, new_len); 3778 if (!ret && skb_is_gso(skb)) 3779 skb_gso_reset(skb); 3780 } 3781 return ret; 3782 } 3783 3784 BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len, 3785 u64, flags) 3786 { 3787 int ret = __bpf_skb_change_tail(skb, new_len, flags); 3788 3789 bpf_compute_data_pointers(skb); 3790 return ret; 3791 } 3792 3793 static const struct bpf_func_proto bpf_skb_change_tail_proto = { 3794 .func = bpf_skb_change_tail, 3795 .gpl_only = false, 3796 .ret_type = RET_INTEGER, 3797 .arg1_type = ARG_PTR_TO_CTX, 3798 .arg2_type = ARG_ANYTHING, 3799 .arg3_type = ARG_ANYTHING, 3800 }; 3801 3802 BPF_CALL_3(sk_skb_change_tail, struct sk_buff *, skb, u32, new_len, 3803 u64, flags) 3804 { 3805 return __bpf_skb_change_tail(skb, new_len, flags); 3806 } 3807 3808 static const struct bpf_func_proto sk_skb_change_tail_proto = { 3809 .func = sk_skb_change_tail, 3810 .gpl_only = false, 3811 .ret_type = RET_INTEGER, 3812 .arg1_type = ARG_PTR_TO_CTX, 3813 .arg2_type = ARG_ANYTHING, 3814 .arg3_type = ARG_ANYTHING, 3815 }; 3816 3817 static inline int __bpf_skb_change_head(struct sk_buff *skb, u32 head_room, 3818 u64 flags) 3819 { 3820 u32 max_len = BPF_SKB_MAX_LEN; 3821 u32 new_len = skb->len + head_room; 3822 int ret; 3823 3824 if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) || 3825 new_len < skb->len)) 3826 return -EINVAL; 3827 3828 ret = skb_cow(skb, head_room); 3829 if (likely(!ret)) { 3830 /* Idea for this helper is that we currently only 3831 * allow to expand on mac header. This means that 3832 * skb->protocol network header, etc, stay as is. 3833 * Compared to bpf_skb_change_tail(), we're more 3834 * flexible due to not needing to linearize or 3835 * reset GSO. Intention for this helper is to be 3836 * used by an L3 skb that needs to push mac header 3837 * for redirection into L2 device. 3838 */ 3839 __skb_push(skb, head_room); 3840 memset(skb->data, 0, head_room); 3841 skb_reset_mac_header(skb); 3842 skb_reset_mac_len(skb); 3843 } 3844 3845 return ret; 3846 } 3847 3848 BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room, 3849 u64, flags) 3850 { 3851 int ret = __bpf_skb_change_head(skb, head_room, flags); 3852 3853 bpf_compute_data_pointers(skb); 3854 return ret; 3855 } 3856 3857 static const struct bpf_func_proto bpf_skb_change_head_proto = { 3858 .func = bpf_skb_change_head, 3859 .gpl_only = false, 3860 .ret_type = RET_INTEGER, 3861 .arg1_type = ARG_PTR_TO_CTX, 3862 .arg2_type = ARG_ANYTHING, 3863 .arg3_type = ARG_ANYTHING, 3864 }; 3865 3866 BPF_CALL_3(sk_skb_change_head, struct sk_buff *, skb, u32, head_room, 3867 u64, flags) 3868 { 3869 return __bpf_skb_change_head(skb, head_room, flags); 3870 } 3871 3872 static const struct bpf_func_proto sk_skb_change_head_proto = { 3873 .func = sk_skb_change_head, 3874 .gpl_only = false, 3875 .ret_type = RET_INTEGER, 3876 .arg1_type = ARG_PTR_TO_CTX, 3877 .arg2_type = ARG_ANYTHING, 3878 .arg3_type = ARG_ANYTHING, 3879 }; 3880 3881 BPF_CALL_1(bpf_xdp_get_buff_len, struct xdp_buff*, xdp) 3882 { 3883 return xdp_get_buff_len(xdp); 3884 } 3885 3886 static const struct bpf_func_proto bpf_xdp_get_buff_len_proto = { 3887 .func = bpf_xdp_get_buff_len, 3888 .gpl_only = false, 3889 .ret_type = RET_INTEGER, 3890 .arg1_type = ARG_PTR_TO_CTX, 3891 }; 3892 3893 BTF_ID_LIST_SINGLE(bpf_xdp_get_buff_len_bpf_ids, struct, xdp_buff) 3894 3895 const struct bpf_func_proto bpf_xdp_get_buff_len_trace_proto = { 3896 .func = bpf_xdp_get_buff_len, 3897 .gpl_only = false, 3898 .arg1_type = ARG_PTR_TO_BTF_ID, 3899 .arg1_btf_id = &bpf_xdp_get_buff_len_bpf_ids[0], 3900 }; 3901 3902 static unsigned long xdp_get_metalen(const struct xdp_buff *xdp) 3903 { 3904 return xdp_data_meta_unsupported(xdp) ? 0 : 3905 xdp->data - xdp->data_meta; 3906 } 3907 3908 BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset) 3909 { 3910 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); 3911 unsigned long metalen = xdp_get_metalen(xdp); 3912 void *data_start = xdp_frame_end + metalen; 3913 void *data = xdp->data + offset; 3914 3915 if (unlikely(data < data_start || 3916 data > xdp->data_end - ETH_HLEN)) 3917 return -EINVAL; 3918 3919 if (metalen) 3920 memmove(xdp->data_meta + offset, 3921 xdp->data_meta, metalen); 3922 xdp->data_meta += offset; 3923 xdp->data = data; 3924 3925 return 0; 3926 } 3927 3928 static const struct bpf_func_proto bpf_xdp_adjust_head_proto = { 3929 .func = bpf_xdp_adjust_head, 3930 .gpl_only = false, 3931 .ret_type = RET_INTEGER, 3932 .arg1_type = ARG_PTR_TO_CTX, 3933 .arg2_type = ARG_ANYTHING, 3934 }; 3935 3936 void bpf_xdp_copy_buf(struct xdp_buff *xdp, unsigned long off, 3937 void *buf, unsigned long len, bool flush) 3938 { 3939 unsigned long ptr_len, ptr_off = 0; 3940 skb_frag_t *next_frag, *end_frag; 3941 struct skb_shared_info *sinfo; 3942 void *src, *dst; 3943 u8 *ptr_buf; 3944 3945 if (likely(xdp->data_end - xdp->data >= off + len)) { 3946 src = flush ? buf : xdp->data + off; 3947 dst = flush ? xdp->data + off : buf; 3948 memcpy(dst, src, len); 3949 return; 3950 } 3951 3952 sinfo = xdp_get_shared_info_from_buff(xdp); 3953 end_frag = &sinfo->frags[sinfo->nr_frags]; 3954 next_frag = &sinfo->frags[0]; 3955 3956 ptr_len = xdp->data_end - xdp->data; 3957 ptr_buf = xdp->data; 3958 3959 while (true) { 3960 if (off < ptr_off + ptr_len) { 3961 unsigned long copy_off = off - ptr_off; 3962 unsigned long copy_len = min(len, ptr_len - copy_off); 3963 3964 src = flush ? buf : ptr_buf + copy_off; 3965 dst = flush ? ptr_buf + copy_off : buf; 3966 memcpy(dst, src, copy_len); 3967 3968 off += copy_len; 3969 len -= copy_len; 3970 buf += copy_len; 3971 } 3972 3973 if (!len || next_frag == end_frag) 3974 break; 3975 3976 ptr_off += ptr_len; 3977 ptr_buf = skb_frag_address(next_frag); 3978 ptr_len = skb_frag_size(next_frag); 3979 next_frag++; 3980 } 3981 } 3982 3983 void *bpf_xdp_pointer(struct xdp_buff *xdp, u32 offset, u32 len) 3984 { 3985 u32 size = xdp->data_end - xdp->data; 3986 struct skb_shared_info *sinfo; 3987 void *addr = xdp->data; 3988 int i; 3989 3990 if (unlikely(offset > 0xffff || len > 0xffff)) 3991 return ERR_PTR(-EFAULT); 3992 3993 if (unlikely(offset + len > xdp_get_buff_len(xdp))) 3994 return ERR_PTR(-EINVAL); 3995 3996 if (likely(offset < size)) /* linear area */ 3997 goto out; 3998 3999 sinfo = xdp_get_shared_info_from_buff(xdp); 4000 offset -= size; 4001 for (i = 0; i < sinfo->nr_frags; i++) { /* paged area */ 4002 u32 frag_size = skb_frag_size(&sinfo->frags[i]); 4003 4004 if (offset < frag_size) { 4005 addr = skb_frag_address(&sinfo->frags[i]); 4006 size = frag_size; 4007 break; 4008 } 4009 offset -= frag_size; 4010 } 4011 out: 4012 return offset + len <= size ? addr + offset : NULL; 4013 } 4014 4015 BPF_CALL_4(bpf_xdp_load_bytes, struct xdp_buff *, xdp, u32, offset, 4016 void *, buf, u32, len) 4017 { 4018 void *ptr; 4019 4020 ptr = bpf_xdp_pointer(xdp, offset, len); 4021 if (IS_ERR(ptr)) 4022 return PTR_ERR(ptr); 4023 4024 if (!ptr) 4025 bpf_xdp_copy_buf(xdp, offset, buf, len, false); 4026 else 4027 memcpy(buf, ptr, len); 4028 4029 return 0; 4030 } 4031 4032 static const struct bpf_func_proto bpf_xdp_load_bytes_proto = { 4033 .func = bpf_xdp_load_bytes, 4034 .gpl_only = false, 4035 .ret_type = RET_INTEGER, 4036 .arg1_type = ARG_PTR_TO_CTX, 4037 .arg2_type = ARG_ANYTHING, 4038 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 4039 .arg4_type = ARG_CONST_SIZE, 4040 }; 4041 4042 int __bpf_xdp_load_bytes(struct xdp_buff *xdp, u32 offset, void *buf, u32 len) 4043 { 4044 return ____bpf_xdp_load_bytes(xdp, offset, buf, len); 4045 } 4046 4047 BPF_CALL_4(bpf_xdp_store_bytes, struct xdp_buff *, xdp, u32, offset, 4048 void *, buf, u32, len) 4049 { 4050 void *ptr; 4051 4052 ptr = bpf_xdp_pointer(xdp, offset, len); 4053 if (IS_ERR(ptr)) 4054 return PTR_ERR(ptr); 4055 4056 if (!ptr) 4057 bpf_xdp_copy_buf(xdp, offset, buf, len, true); 4058 else 4059 memcpy(ptr, buf, len); 4060 4061 return 0; 4062 } 4063 4064 static const struct bpf_func_proto bpf_xdp_store_bytes_proto = { 4065 .func = bpf_xdp_store_bytes, 4066 .gpl_only = false, 4067 .ret_type = RET_INTEGER, 4068 .arg1_type = ARG_PTR_TO_CTX, 4069 .arg2_type = ARG_ANYTHING, 4070 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 4071 .arg4_type = ARG_CONST_SIZE, 4072 }; 4073 4074 int __bpf_xdp_store_bytes(struct xdp_buff *xdp, u32 offset, void *buf, u32 len) 4075 { 4076 return ____bpf_xdp_store_bytes(xdp, offset, buf, len); 4077 } 4078 4079 static int bpf_xdp_frags_increase_tail(struct xdp_buff *xdp, int offset) 4080 { 4081 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); 4082 skb_frag_t *frag = &sinfo->frags[sinfo->nr_frags - 1]; 4083 struct xdp_rxq_info *rxq = xdp->rxq; 4084 unsigned int tailroom; 4085 4086 if (!rxq->frag_size || rxq->frag_size > xdp->frame_sz) 4087 return -EOPNOTSUPP; 4088 4089 tailroom = rxq->frag_size - skb_frag_size(frag) - skb_frag_off(frag); 4090 if (unlikely(offset > tailroom)) 4091 return -EINVAL; 4092 4093 memset(skb_frag_address(frag) + skb_frag_size(frag), 0, offset); 4094 skb_frag_size_add(frag, offset); 4095 sinfo->xdp_frags_size += offset; 4096 if (rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL) 4097 xsk_buff_get_tail(xdp)->data_end += offset; 4098 4099 return 0; 4100 } 4101 4102 static void bpf_xdp_shrink_data_zc(struct xdp_buff *xdp, int shrink, 4103 struct xdp_mem_info *mem_info, bool release) 4104 { 4105 struct xdp_buff *zc_frag = xsk_buff_get_tail(xdp); 4106 4107 if (release) { 4108 xsk_buff_del_tail(zc_frag); 4109 __xdp_return(NULL, mem_info, false, zc_frag); 4110 } else { 4111 zc_frag->data_end -= shrink; 4112 } 4113 } 4114 4115 static bool bpf_xdp_shrink_data(struct xdp_buff *xdp, skb_frag_t *frag, 4116 int shrink) 4117 { 4118 struct xdp_mem_info *mem_info = &xdp->rxq->mem; 4119 bool release = skb_frag_size(frag) == shrink; 4120 4121 if (mem_info->type == MEM_TYPE_XSK_BUFF_POOL) { 4122 bpf_xdp_shrink_data_zc(xdp, shrink, mem_info, release); 4123 goto out; 4124 } 4125 4126 if (release) { 4127 struct page *page = skb_frag_page(frag); 4128 4129 __xdp_return(page_address(page), mem_info, false, NULL); 4130 } 4131 4132 out: 4133 return release; 4134 } 4135 4136 static int bpf_xdp_frags_shrink_tail(struct xdp_buff *xdp, int offset) 4137 { 4138 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); 4139 int i, n_frags_free = 0, len_free = 0; 4140 4141 if (unlikely(offset > (int)xdp_get_buff_len(xdp) - ETH_HLEN)) 4142 return -EINVAL; 4143 4144 for (i = sinfo->nr_frags - 1; i >= 0 && offset > 0; i--) { 4145 skb_frag_t *frag = &sinfo->frags[i]; 4146 int shrink = min_t(int, offset, skb_frag_size(frag)); 4147 4148 len_free += shrink; 4149 offset -= shrink; 4150 if (bpf_xdp_shrink_data(xdp, frag, shrink)) { 4151 n_frags_free++; 4152 } else { 4153 skb_frag_size_sub(frag, shrink); 4154 break; 4155 } 4156 } 4157 sinfo->nr_frags -= n_frags_free; 4158 sinfo->xdp_frags_size -= len_free; 4159 4160 if (unlikely(!sinfo->nr_frags)) { 4161 xdp_buff_clear_frags_flag(xdp); 4162 xdp->data_end -= offset; 4163 } 4164 4165 return 0; 4166 } 4167 4168 BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset) 4169 { 4170 void *data_hard_end = xdp_data_hard_end(xdp); /* use xdp->frame_sz */ 4171 void *data_end = xdp->data_end + offset; 4172 4173 if (unlikely(xdp_buff_has_frags(xdp))) { /* non-linear xdp buff */ 4174 if (offset < 0) 4175 return bpf_xdp_frags_shrink_tail(xdp, -offset); 4176 4177 return bpf_xdp_frags_increase_tail(xdp, offset); 4178 } 4179 4180 /* Notice that xdp_data_hard_end have reserved some tailroom */ 4181 if (unlikely(data_end > data_hard_end)) 4182 return -EINVAL; 4183 4184 if (unlikely(data_end < xdp->data + ETH_HLEN)) 4185 return -EINVAL; 4186 4187 /* Clear memory area on grow, can contain uninit kernel memory */ 4188 if (offset > 0) 4189 memset(xdp->data_end, 0, offset); 4190 4191 xdp->data_end = data_end; 4192 4193 return 0; 4194 } 4195 4196 static const struct bpf_func_proto bpf_xdp_adjust_tail_proto = { 4197 .func = bpf_xdp_adjust_tail, 4198 .gpl_only = false, 4199 .ret_type = RET_INTEGER, 4200 .arg1_type = ARG_PTR_TO_CTX, 4201 .arg2_type = ARG_ANYTHING, 4202 }; 4203 4204 BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset) 4205 { 4206 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); 4207 void *meta = xdp->data_meta + offset; 4208 unsigned long metalen = xdp->data - meta; 4209 4210 if (xdp_data_meta_unsupported(xdp)) 4211 return -ENOTSUPP; 4212 if (unlikely(meta < xdp_frame_end || 4213 meta > xdp->data)) 4214 return -EINVAL; 4215 if (unlikely(xdp_metalen_invalid(metalen))) 4216 return -EACCES; 4217 4218 xdp->data_meta = meta; 4219 4220 return 0; 4221 } 4222 4223 static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = { 4224 .func = bpf_xdp_adjust_meta, 4225 .gpl_only = false, 4226 .ret_type = RET_INTEGER, 4227 .arg1_type = ARG_PTR_TO_CTX, 4228 .arg2_type = ARG_ANYTHING, 4229 }; 4230 4231 /** 4232 * DOC: xdp redirect 4233 * 4234 * XDP_REDIRECT works by a three-step process, implemented in the functions 4235 * below: 4236 * 4237 * 1. The bpf_redirect() and bpf_redirect_map() helpers will lookup the target 4238 * of the redirect and store it (along with some other metadata) in a per-CPU 4239 * struct bpf_redirect_info. 4240 * 4241 * 2. When the program returns the XDP_REDIRECT return code, the driver will 4242 * call xdp_do_redirect() which will use the information in struct 4243 * bpf_redirect_info to actually enqueue the frame into a map type-specific 4244 * bulk queue structure. 4245 * 4246 * 3. Before exiting its NAPI poll loop, the driver will call 4247 * xdp_do_flush(), which will flush all the different bulk queues, 4248 * thus completing the redirect. Note that xdp_do_flush() must be 4249 * called before napi_complete_done() in the driver, as the 4250 * XDP_REDIRECT logic relies on being inside a single NAPI instance 4251 * through to the xdp_do_flush() call for RCU protection of all 4252 * in-kernel data structures. 4253 */ 4254 /* 4255 * Pointers to the map entries will be kept around for this whole sequence of 4256 * steps, protected by RCU. However, there is no top-level rcu_read_lock() in 4257 * the core code; instead, the RCU protection relies on everything happening 4258 * inside a single NAPI poll sequence, which means it's between a pair of calls 4259 * to local_bh_disable()/local_bh_enable(). 4260 * 4261 * The map entries are marked as __rcu and the map code makes sure to 4262 * dereference those pointers with rcu_dereference_check() in a way that works 4263 * for both sections that to hold an rcu_read_lock() and sections that are 4264 * called from NAPI without a separate rcu_read_lock(). The code below does not 4265 * use RCU annotations, but relies on those in the map code. 4266 */ 4267 void xdp_do_flush(void) 4268 { 4269 __dev_flush(); 4270 __cpu_map_flush(); 4271 __xsk_map_flush(); 4272 } 4273 EXPORT_SYMBOL_GPL(xdp_do_flush); 4274 4275 #if defined(CONFIG_DEBUG_NET) && defined(CONFIG_BPF_SYSCALL) 4276 void xdp_do_check_flushed(struct napi_struct *napi) 4277 { 4278 bool ret; 4279 4280 ret = dev_check_flush(); 4281 ret |= cpu_map_check_flush(); 4282 ret |= xsk_map_check_flush(); 4283 4284 WARN_ONCE(ret, "Missing xdp_do_flush() invocation after NAPI by %ps\n", 4285 napi->poll); 4286 } 4287 #endif 4288 4289 void bpf_clear_redirect_map(struct bpf_map *map) 4290 { 4291 struct bpf_redirect_info *ri; 4292 int cpu; 4293 4294 for_each_possible_cpu(cpu) { 4295 ri = per_cpu_ptr(&bpf_redirect_info, cpu); 4296 /* Avoid polluting remote cacheline due to writes if 4297 * not needed. Once we pass this test, we need the 4298 * cmpxchg() to make sure it hasn't been changed in 4299 * the meantime by remote CPU. 4300 */ 4301 if (unlikely(READ_ONCE(ri->map) == map)) 4302 cmpxchg(&ri->map, map, NULL); 4303 } 4304 } 4305 4306 DEFINE_STATIC_KEY_FALSE(bpf_master_redirect_enabled_key); 4307 EXPORT_SYMBOL_GPL(bpf_master_redirect_enabled_key); 4308 4309 u32 xdp_master_redirect(struct xdp_buff *xdp) 4310 { 4311 struct net_device *master, *slave; 4312 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4313 4314 master = netdev_master_upper_dev_get_rcu(xdp->rxq->dev); 4315 slave = master->netdev_ops->ndo_xdp_get_xmit_slave(master, xdp); 4316 if (slave && slave != xdp->rxq->dev) { 4317 /* The target device is different from the receiving device, so 4318 * redirect it to the new device. 4319 * Using XDP_REDIRECT gets the correct behaviour from XDP enabled 4320 * drivers to unmap the packet from their rx ring. 4321 */ 4322 ri->tgt_index = slave->ifindex; 4323 ri->map_id = INT_MAX; 4324 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4325 return XDP_REDIRECT; 4326 } 4327 return XDP_TX; 4328 } 4329 EXPORT_SYMBOL_GPL(xdp_master_redirect); 4330 4331 static inline int __xdp_do_redirect_xsk(struct bpf_redirect_info *ri, 4332 struct net_device *dev, 4333 struct xdp_buff *xdp, 4334 struct bpf_prog *xdp_prog) 4335 { 4336 enum bpf_map_type map_type = ri->map_type; 4337 void *fwd = ri->tgt_value; 4338 u32 map_id = ri->map_id; 4339 int err; 4340 4341 ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */ 4342 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4343 4344 err = __xsk_map_redirect(fwd, xdp); 4345 if (unlikely(err)) 4346 goto err; 4347 4348 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index); 4349 return 0; 4350 err: 4351 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index, err); 4352 return err; 4353 } 4354 4355 static __always_inline int __xdp_do_redirect_frame(struct bpf_redirect_info *ri, 4356 struct net_device *dev, 4357 struct xdp_frame *xdpf, 4358 struct bpf_prog *xdp_prog) 4359 { 4360 enum bpf_map_type map_type = ri->map_type; 4361 void *fwd = ri->tgt_value; 4362 u32 map_id = ri->map_id; 4363 struct bpf_map *map; 4364 int err; 4365 4366 ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */ 4367 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4368 4369 if (unlikely(!xdpf)) { 4370 err = -EOVERFLOW; 4371 goto err; 4372 } 4373 4374 switch (map_type) { 4375 case BPF_MAP_TYPE_DEVMAP: 4376 fallthrough; 4377 case BPF_MAP_TYPE_DEVMAP_HASH: 4378 map = READ_ONCE(ri->map); 4379 if (unlikely(map)) { 4380 WRITE_ONCE(ri->map, NULL); 4381 err = dev_map_enqueue_multi(xdpf, dev, map, 4382 ri->flags & BPF_F_EXCLUDE_INGRESS); 4383 } else { 4384 err = dev_map_enqueue(fwd, xdpf, dev); 4385 } 4386 break; 4387 case BPF_MAP_TYPE_CPUMAP: 4388 err = cpu_map_enqueue(fwd, xdpf, dev); 4389 break; 4390 case BPF_MAP_TYPE_UNSPEC: 4391 if (map_id == INT_MAX) { 4392 fwd = dev_get_by_index_rcu(dev_net(dev), ri->tgt_index); 4393 if (unlikely(!fwd)) { 4394 err = -EINVAL; 4395 break; 4396 } 4397 err = dev_xdp_enqueue(fwd, xdpf, dev); 4398 break; 4399 } 4400 fallthrough; 4401 default: 4402 err = -EBADRQC; 4403 } 4404 4405 if (unlikely(err)) 4406 goto err; 4407 4408 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index); 4409 return 0; 4410 err: 4411 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index, err); 4412 return err; 4413 } 4414 4415 int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp, 4416 struct bpf_prog *xdp_prog) 4417 { 4418 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4419 enum bpf_map_type map_type = ri->map_type; 4420 4421 if (map_type == BPF_MAP_TYPE_XSKMAP) 4422 return __xdp_do_redirect_xsk(ri, dev, xdp, xdp_prog); 4423 4424 return __xdp_do_redirect_frame(ri, dev, xdp_convert_buff_to_frame(xdp), 4425 xdp_prog); 4426 } 4427 EXPORT_SYMBOL_GPL(xdp_do_redirect); 4428 4429 int xdp_do_redirect_frame(struct net_device *dev, struct xdp_buff *xdp, 4430 struct xdp_frame *xdpf, struct bpf_prog *xdp_prog) 4431 { 4432 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4433 enum bpf_map_type map_type = ri->map_type; 4434 4435 if (map_type == BPF_MAP_TYPE_XSKMAP) 4436 return __xdp_do_redirect_xsk(ri, dev, xdp, xdp_prog); 4437 4438 return __xdp_do_redirect_frame(ri, dev, xdpf, xdp_prog); 4439 } 4440 EXPORT_SYMBOL_GPL(xdp_do_redirect_frame); 4441 4442 static int xdp_do_generic_redirect_map(struct net_device *dev, 4443 struct sk_buff *skb, 4444 struct xdp_buff *xdp, 4445 struct bpf_prog *xdp_prog, 4446 void *fwd, 4447 enum bpf_map_type map_type, u32 map_id) 4448 { 4449 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4450 struct bpf_map *map; 4451 int err; 4452 4453 switch (map_type) { 4454 case BPF_MAP_TYPE_DEVMAP: 4455 fallthrough; 4456 case BPF_MAP_TYPE_DEVMAP_HASH: 4457 map = READ_ONCE(ri->map); 4458 if (unlikely(map)) { 4459 WRITE_ONCE(ri->map, NULL); 4460 err = dev_map_redirect_multi(dev, skb, xdp_prog, map, 4461 ri->flags & BPF_F_EXCLUDE_INGRESS); 4462 } else { 4463 err = dev_map_generic_redirect(fwd, skb, xdp_prog); 4464 } 4465 if (unlikely(err)) 4466 goto err; 4467 break; 4468 case BPF_MAP_TYPE_XSKMAP: 4469 err = xsk_generic_rcv(fwd, xdp); 4470 if (err) 4471 goto err; 4472 consume_skb(skb); 4473 break; 4474 case BPF_MAP_TYPE_CPUMAP: 4475 err = cpu_map_generic_redirect(fwd, skb); 4476 if (unlikely(err)) 4477 goto err; 4478 break; 4479 default: 4480 err = -EBADRQC; 4481 goto err; 4482 } 4483 4484 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index); 4485 return 0; 4486 err: 4487 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index, err); 4488 return err; 4489 } 4490 4491 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb, 4492 struct xdp_buff *xdp, struct bpf_prog *xdp_prog) 4493 { 4494 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4495 enum bpf_map_type map_type = ri->map_type; 4496 void *fwd = ri->tgt_value; 4497 u32 map_id = ri->map_id; 4498 int err; 4499 4500 ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */ 4501 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4502 4503 if (map_type == BPF_MAP_TYPE_UNSPEC && map_id == INT_MAX) { 4504 fwd = dev_get_by_index_rcu(dev_net(dev), ri->tgt_index); 4505 if (unlikely(!fwd)) { 4506 err = -EINVAL; 4507 goto err; 4508 } 4509 4510 err = xdp_ok_fwd_dev(fwd, skb->len); 4511 if (unlikely(err)) 4512 goto err; 4513 4514 skb->dev = fwd; 4515 _trace_xdp_redirect(dev, xdp_prog, ri->tgt_index); 4516 generic_xdp_tx(skb, xdp_prog); 4517 return 0; 4518 } 4519 4520 return xdp_do_generic_redirect_map(dev, skb, xdp, xdp_prog, fwd, map_type, map_id); 4521 err: 4522 _trace_xdp_redirect_err(dev, xdp_prog, ri->tgt_index, err); 4523 return err; 4524 } 4525 4526 BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags) 4527 { 4528 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4529 4530 if (unlikely(flags)) 4531 return XDP_ABORTED; 4532 4533 /* NB! Map type UNSPEC and map_id == INT_MAX (never generated 4534 * by map_idr) is used for ifindex based XDP redirect. 4535 */ 4536 ri->tgt_index = ifindex; 4537 ri->map_id = INT_MAX; 4538 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4539 4540 return XDP_REDIRECT; 4541 } 4542 4543 static const struct bpf_func_proto bpf_xdp_redirect_proto = { 4544 .func = bpf_xdp_redirect, 4545 .gpl_only = false, 4546 .ret_type = RET_INTEGER, 4547 .arg1_type = ARG_ANYTHING, 4548 .arg2_type = ARG_ANYTHING, 4549 }; 4550 4551 BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u64, key, 4552 u64, flags) 4553 { 4554 return map->ops->map_redirect(map, key, flags); 4555 } 4556 4557 static const struct bpf_func_proto bpf_xdp_redirect_map_proto = { 4558 .func = bpf_xdp_redirect_map, 4559 .gpl_only = false, 4560 .ret_type = RET_INTEGER, 4561 .arg1_type = ARG_CONST_MAP_PTR, 4562 .arg2_type = ARG_ANYTHING, 4563 .arg3_type = ARG_ANYTHING, 4564 }; 4565 4566 static unsigned long bpf_skb_copy(void *dst_buff, const void *skb, 4567 unsigned long off, unsigned long len) 4568 { 4569 void *ptr = skb_header_pointer(skb, off, len, dst_buff); 4570 4571 if (unlikely(!ptr)) 4572 return len; 4573 if (ptr != dst_buff) 4574 memcpy(dst_buff, ptr, len); 4575 4576 return 0; 4577 } 4578 4579 BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map, 4580 u64, flags, void *, meta, u64, meta_size) 4581 { 4582 u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32; 4583 4584 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) 4585 return -EINVAL; 4586 if (unlikely(!skb || skb_size > skb->len)) 4587 return -EFAULT; 4588 4589 return bpf_event_output(map, flags, meta, meta_size, skb, skb_size, 4590 bpf_skb_copy); 4591 } 4592 4593 static const struct bpf_func_proto bpf_skb_event_output_proto = { 4594 .func = bpf_skb_event_output, 4595 .gpl_only = true, 4596 .ret_type = RET_INTEGER, 4597 .arg1_type = ARG_PTR_TO_CTX, 4598 .arg2_type = ARG_CONST_MAP_PTR, 4599 .arg3_type = ARG_ANYTHING, 4600 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4601 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4602 }; 4603 4604 BTF_ID_LIST_SINGLE(bpf_skb_output_btf_ids, struct, sk_buff) 4605 4606 const struct bpf_func_proto bpf_skb_output_proto = { 4607 .func = bpf_skb_event_output, 4608 .gpl_only = true, 4609 .ret_type = RET_INTEGER, 4610 .arg1_type = ARG_PTR_TO_BTF_ID, 4611 .arg1_btf_id = &bpf_skb_output_btf_ids[0], 4612 .arg2_type = ARG_CONST_MAP_PTR, 4613 .arg3_type = ARG_ANYTHING, 4614 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4615 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4616 }; 4617 4618 static unsigned short bpf_tunnel_key_af(u64 flags) 4619 { 4620 return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET; 4621 } 4622 4623 BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to, 4624 u32, size, u64, flags) 4625 { 4626 const struct ip_tunnel_info *info = skb_tunnel_info(skb); 4627 u8 compat[sizeof(struct bpf_tunnel_key)]; 4628 void *to_orig = to; 4629 int err; 4630 4631 if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6 | 4632 BPF_F_TUNINFO_FLAGS)))) { 4633 err = -EINVAL; 4634 goto err_clear; 4635 } 4636 if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) { 4637 err = -EPROTO; 4638 goto err_clear; 4639 } 4640 if (unlikely(size != sizeof(struct bpf_tunnel_key))) { 4641 err = -EINVAL; 4642 switch (size) { 4643 case offsetof(struct bpf_tunnel_key, local_ipv6[0]): 4644 case offsetof(struct bpf_tunnel_key, tunnel_label): 4645 case offsetof(struct bpf_tunnel_key, tunnel_ext): 4646 goto set_compat; 4647 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): 4648 /* Fixup deprecated structure layouts here, so we have 4649 * a common path later on. 4650 */ 4651 if (ip_tunnel_info_af(info) != AF_INET) 4652 goto err_clear; 4653 set_compat: 4654 to = (struct bpf_tunnel_key *)compat; 4655 break; 4656 default: 4657 goto err_clear; 4658 } 4659 } 4660 4661 to->tunnel_id = be64_to_cpu(info->key.tun_id); 4662 to->tunnel_tos = info->key.tos; 4663 to->tunnel_ttl = info->key.ttl; 4664 if (flags & BPF_F_TUNINFO_FLAGS) 4665 to->tunnel_flags = info->key.tun_flags; 4666 else 4667 to->tunnel_ext = 0; 4668 4669 if (flags & BPF_F_TUNINFO_IPV6) { 4670 memcpy(to->remote_ipv6, &info->key.u.ipv6.src, 4671 sizeof(to->remote_ipv6)); 4672 memcpy(to->local_ipv6, &info->key.u.ipv6.dst, 4673 sizeof(to->local_ipv6)); 4674 to->tunnel_label = be32_to_cpu(info->key.label); 4675 } else { 4676 to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src); 4677 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); 4678 to->local_ipv4 = be32_to_cpu(info->key.u.ipv4.dst); 4679 memset(&to->local_ipv6[1], 0, sizeof(__u32) * 3); 4680 to->tunnel_label = 0; 4681 } 4682 4683 if (unlikely(size != sizeof(struct bpf_tunnel_key))) 4684 memcpy(to_orig, to, size); 4685 4686 return 0; 4687 err_clear: 4688 memset(to_orig, 0, size); 4689 return err; 4690 } 4691 4692 static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = { 4693 .func = bpf_skb_get_tunnel_key, 4694 .gpl_only = false, 4695 .ret_type = RET_INTEGER, 4696 .arg1_type = ARG_PTR_TO_CTX, 4697 .arg2_type = ARG_PTR_TO_UNINIT_MEM, 4698 .arg3_type = ARG_CONST_SIZE, 4699 .arg4_type = ARG_ANYTHING, 4700 }; 4701 4702 BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size) 4703 { 4704 const struct ip_tunnel_info *info = skb_tunnel_info(skb); 4705 int err; 4706 4707 if (unlikely(!info || 4708 !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) { 4709 err = -ENOENT; 4710 goto err_clear; 4711 } 4712 if (unlikely(size < info->options_len)) { 4713 err = -ENOMEM; 4714 goto err_clear; 4715 } 4716 4717 ip_tunnel_info_opts_get(to, info); 4718 if (size > info->options_len) 4719 memset(to + info->options_len, 0, size - info->options_len); 4720 4721 return info->options_len; 4722 err_clear: 4723 memset(to, 0, size); 4724 return err; 4725 } 4726 4727 static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = { 4728 .func = bpf_skb_get_tunnel_opt, 4729 .gpl_only = false, 4730 .ret_type = RET_INTEGER, 4731 .arg1_type = ARG_PTR_TO_CTX, 4732 .arg2_type = ARG_PTR_TO_UNINIT_MEM, 4733 .arg3_type = ARG_CONST_SIZE, 4734 }; 4735 4736 static struct metadata_dst __percpu *md_dst; 4737 4738 BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb, 4739 const struct bpf_tunnel_key *, from, u32, size, u64, flags) 4740 { 4741 struct metadata_dst *md = this_cpu_ptr(md_dst); 4742 u8 compat[sizeof(struct bpf_tunnel_key)]; 4743 struct ip_tunnel_info *info; 4744 4745 if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX | 4746 BPF_F_DONT_FRAGMENT | BPF_F_SEQ_NUMBER | 4747 BPF_F_NO_TUNNEL_KEY))) 4748 return -EINVAL; 4749 if (unlikely(size != sizeof(struct bpf_tunnel_key))) { 4750 switch (size) { 4751 case offsetof(struct bpf_tunnel_key, local_ipv6[0]): 4752 case offsetof(struct bpf_tunnel_key, tunnel_label): 4753 case offsetof(struct bpf_tunnel_key, tunnel_ext): 4754 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): 4755 /* Fixup deprecated structure layouts here, so we have 4756 * a common path later on. 4757 */ 4758 memcpy(compat, from, size); 4759 memset(compat + size, 0, sizeof(compat) - size); 4760 from = (const struct bpf_tunnel_key *) compat; 4761 break; 4762 default: 4763 return -EINVAL; 4764 } 4765 } 4766 if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) || 4767 from->tunnel_ext)) 4768 return -EINVAL; 4769 4770 skb_dst_drop(skb); 4771 dst_hold((struct dst_entry *) md); 4772 skb_dst_set(skb, (struct dst_entry *) md); 4773 4774 info = &md->u.tun_info; 4775 memset(info, 0, sizeof(*info)); 4776 info->mode = IP_TUNNEL_INFO_TX; 4777 4778 info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE; 4779 if (flags & BPF_F_DONT_FRAGMENT) 4780 info->key.tun_flags |= TUNNEL_DONT_FRAGMENT; 4781 if (flags & BPF_F_ZERO_CSUM_TX) 4782 info->key.tun_flags &= ~TUNNEL_CSUM; 4783 if (flags & BPF_F_SEQ_NUMBER) 4784 info->key.tun_flags |= TUNNEL_SEQ; 4785 if (flags & BPF_F_NO_TUNNEL_KEY) 4786 info->key.tun_flags &= ~TUNNEL_KEY; 4787 4788 info->key.tun_id = cpu_to_be64(from->tunnel_id); 4789 info->key.tos = from->tunnel_tos; 4790 info->key.ttl = from->tunnel_ttl; 4791 4792 if (flags & BPF_F_TUNINFO_IPV6) { 4793 info->mode |= IP_TUNNEL_INFO_IPV6; 4794 memcpy(&info->key.u.ipv6.dst, from->remote_ipv6, 4795 sizeof(from->remote_ipv6)); 4796 memcpy(&info->key.u.ipv6.src, from->local_ipv6, 4797 sizeof(from->local_ipv6)); 4798 info->key.label = cpu_to_be32(from->tunnel_label) & 4799 IPV6_FLOWLABEL_MASK; 4800 } else { 4801 info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4); 4802 info->key.u.ipv4.src = cpu_to_be32(from->local_ipv4); 4803 info->key.flow_flags = FLOWI_FLAG_ANYSRC; 4804 } 4805 4806 return 0; 4807 } 4808 4809 static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = { 4810 .func = bpf_skb_set_tunnel_key, 4811 .gpl_only = false, 4812 .ret_type = RET_INTEGER, 4813 .arg1_type = ARG_PTR_TO_CTX, 4814 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4815 .arg3_type = ARG_CONST_SIZE, 4816 .arg4_type = ARG_ANYTHING, 4817 }; 4818 4819 BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb, 4820 const u8 *, from, u32, size) 4821 { 4822 struct ip_tunnel_info *info = skb_tunnel_info(skb); 4823 const struct metadata_dst *md = this_cpu_ptr(md_dst); 4824 4825 if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1)))) 4826 return -EINVAL; 4827 if (unlikely(size > IP_TUNNEL_OPTS_MAX)) 4828 return -ENOMEM; 4829 4830 ip_tunnel_info_opts_set(info, from, size, TUNNEL_OPTIONS_PRESENT); 4831 4832 return 0; 4833 } 4834 4835 static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = { 4836 .func = bpf_skb_set_tunnel_opt, 4837 .gpl_only = false, 4838 .ret_type = RET_INTEGER, 4839 .arg1_type = ARG_PTR_TO_CTX, 4840 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4841 .arg3_type = ARG_CONST_SIZE, 4842 }; 4843 4844 static const struct bpf_func_proto * 4845 bpf_get_skb_set_tunnel_proto(enum bpf_func_id which) 4846 { 4847 if (!md_dst) { 4848 struct metadata_dst __percpu *tmp; 4849 4850 tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX, 4851 METADATA_IP_TUNNEL, 4852 GFP_KERNEL); 4853 if (!tmp) 4854 return NULL; 4855 if (cmpxchg(&md_dst, NULL, tmp)) 4856 metadata_dst_free_percpu(tmp); 4857 } 4858 4859 switch (which) { 4860 case BPF_FUNC_skb_set_tunnel_key: 4861 return &bpf_skb_set_tunnel_key_proto; 4862 case BPF_FUNC_skb_set_tunnel_opt: 4863 return &bpf_skb_set_tunnel_opt_proto; 4864 default: 4865 return NULL; 4866 } 4867 } 4868 4869 BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map, 4870 u32, idx) 4871 { 4872 struct bpf_array *array = container_of(map, struct bpf_array, map); 4873 struct cgroup *cgrp; 4874 struct sock *sk; 4875 4876 sk = skb_to_full_sk(skb); 4877 if (!sk || !sk_fullsock(sk)) 4878 return -ENOENT; 4879 if (unlikely(idx >= array->map.max_entries)) 4880 return -E2BIG; 4881 4882 cgrp = READ_ONCE(array->ptrs[idx]); 4883 if (unlikely(!cgrp)) 4884 return -EAGAIN; 4885 4886 return sk_under_cgroup_hierarchy(sk, cgrp); 4887 } 4888 4889 static const struct bpf_func_proto bpf_skb_under_cgroup_proto = { 4890 .func = bpf_skb_under_cgroup, 4891 .gpl_only = false, 4892 .ret_type = RET_INTEGER, 4893 .arg1_type = ARG_PTR_TO_CTX, 4894 .arg2_type = ARG_CONST_MAP_PTR, 4895 .arg3_type = ARG_ANYTHING, 4896 }; 4897 4898 #ifdef CONFIG_SOCK_CGROUP_DATA 4899 static inline u64 __bpf_sk_cgroup_id(struct sock *sk) 4900 { 4901 struct cgroup *cgrp; 4902 4903 sk = sk_to_full_sk(sk); 4904 if (!sk || !sk_fullsock(sk)) 4905 return 0; 4906 4907 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); 4908 return cgroup_id(cgrp); 4909 } 4910 4911 BPF_CALL_1(bpf_skb_cgroup_id, const struct sk_buff *, skb) 4912 { 4913 return __bpf_sk_cgroup_id(skb->sk); 4914 } 4915 4916 static const struct bpf_func_proto bpf_skb_cgroup_id_proto = { 4917 .func = bpf_skb_cgroup_id, 4918 .gpl_only = false, 4919 .ret_type = RET_INTEGER, 4920 .arg1_type = ARG_PTR_TO_CTX, 4921 }; 4922 4923 static inline u64 __bpf_sk_ancestor_cgroup_id(struct sock *sk, 4924 int ancestor_level) 4925 { 4926 struct cgroup *ancestor; 4927 struct cgroup *cgrp; 4928 4929 sk = sk_to_full_sk(sk); 4930 if (!sk || !sk_fullsock(sk)) 4931 return 0; 4932 4933 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); 4934 ancestor = cgroup_ancestor(cgrp, ancestor_level); 4935 if (!ancestor) 4936 return 0; 4937 4938 return cgroup_id(ancestor); 4939 } 4940 4941 BPF_CALL_2(bpf_skb_ancestor_cgroup_id, const struct sk_buff *, skb, int, 4942 ancestor_level) 4943 { 4944 return __bpf_sk_ancestor_cgroup_id(skb->sk, ancestor_level); 4945 } 4946 4947 static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto = { 4948 .func = bpf_skb_ancestor_cgroup_id, 4949 .gpl_only = false, 4950 .ret_type = RET_INTEGER, 4951 .arg1_type = ARG_PTR_TO_CTX, 4952 .arg2_type = ARG_ANYTHING, 4953 }; 4954 4955 BPF_CALL_1(bpf_sk_cgroup_id, struct sock *, sk) 4956 { 4957 return __bpf_sk_cgroup_id(sk); 4958 } 4959 4960 static const struct bpf_func_proto bpf_sk_cgroup_id_proto = { 4961 .func = bpf_sk_cgroup_id, 4962 .gpl_only = false, 4963 .ret_type = RET_INTEGER, 4964 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 4965 }; 4966 4967 BPF_CALL_2(bpf_sk_ancestor_cgroup_id, struct sock *, sk, int, ancestor_level) 4968 { 4969 return __bpf_sk_ancestor_cgroup_id(sk, ancestor_level); 4970 } 4971 4972 static const struct bpf_func_proto bpf_sk_ancestor_cgroup_id_proto = { 4973 .func = bpf_sk_ancestor_cgroup_id, 4974 .gpl_only = false, 4975 .ret_type = RET_INTEGER, 4976 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 4977 .arg2_type = ARG_ANYTHING, 4978 }; 4979 #endif 4980 4981 static unsigned long bpf_xdp_copy(void *dst, const void *ctx, 4982 unsigned long off, unsigned long len) 4983 { 4984 struct xdp_buff *xdp = (struct xdp_buff *)ctx; 4985 4986 bpf_xdp_copy_buf(xdp, off, dst, len, false); 4987 return 0; 4988 } 4989 4990 BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map, 4991 u64, flags, void *, meta, u64, meta_size) 4992 { 4993 u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32; 4994 4995 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) 4996 return -EINVAL; 4997 4998 if (unlikely(!xdp || xdp_size > xdp_get_buff_len(xdp))) 4999 return -EFAULT; 5000 5001 return bpf_event_output(map, flags, meta, meta_size, xdp, 5002 xdp_size, bpf_xdp_copy); 5003 } 5004 5005 static const struct bpf_func_proto bpf_xdp_event_output_proto = { 5006 .func = bpf_xdp_event_output, 5007 .gpl_only = true, 5008 .ret_type = RET_INTEGER, 5009 .arg1_type = ARG_PTR_TO_CTX, 5010 .arg2_type = ARG_CONST_MAP_PTR, 5011 .arg3_type = ARG_ANYTHING, 5012 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5013 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 5014 }; 5015 5016 BTF_ID_LIST_SINGLE(bpf_xdp_output_btf_ids, struct, xdp_buff) 5017 5018 const struct bpf_func_proto bpf_xdp_output_proto = { 5019 .func = bpf_xdp_event_output, 5020 .gpl_only = true, 5021 .ret_type = RET_INTEGER, 5022 .arg1_type = ARG_PTR_TO_BTF_ID, 5023 .arg1_btf_id = &bpf_xdp_output_btf_ids[0], 5024 .arg2_type = ARG_CONST_MAP_PTR, 5025 .arg3_type = ARG_ANYTHING, 5026 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5027 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 5028 }; 5029 5030 BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb) 5031 { 5032 return skb->sk ? __sock_gen_cookie(skb->sk) : 0; 5033 } 5034 5035 static const struct bpf_func_proto bpf_get_socket_cookie_proto = { 5036 .func = bpf_get_socket_cookie, 5037 .gpl_only = false, 5038 .ret_type = RET_INTEGER, 5039 .arg1_type = ARG_PTR_TO_CTX, 5040 }; 5041 5042 BPF_CALL_1(bpf_get_socket_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx) 5043 { 5044 return __sock_gen_cookie(ctx->sk); 5045 } 5046 5047 static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto = { 5048 .func = bpf_get_socket_cookie_sock_addr, 5049 .gpl_only = false, 5050 .ret_type = RET_INTEGER, 5051 .arg1_type = ARG_PTR_TO_CTX, 5052 }; 5053 5054 BPF_CALL_1(bpf_get_socket_cookie_sock, struct sock *, ctx) 5055 { 5056 return __sock_gen_cookie(ctx); 5057 } 5058 5059 static const struct bpf_func_proto bpf_get_socket_cookie_sock_proto = { 5060 .func = bpf_get_socket_cookie_sock, 5061 .gpl_only = false, 5062 .ret_type = RET_INTEGER, 5063 .arg1_type = ARG_PTR_TO_CTX, 5064 }; 5065 5066 BPF_CALL_1(bpf_get_socket_ptr_cookie, struct sock *, sk) 5067 { 5068 return sk ? sock_gen_cookie(sk) : 0; 5069 } 5070 5071 const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto = { 5072 .func = bpf_get_socket_ptr_cookie, 5073 .gpl_only = false, 5074 .ret_type = RET_INTEGER, 5075 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON | PTR_MAYBE_NULL, 5076 }; 5077 5078 BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx) 5079 { 5080 return __sock_gen_cookie(ctx->sk); 5081 } 5082 5083 static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto = { 5084 .func = bpf_get_socket_cookie_sock_ops, 5085 .gpl_only = false, 5086 .ret_type = RET_INTEGER, 5087 .arg1_type = ARG_PTR_TO_CTX, 5088 }; 5089 5090 static u64 __bpf_get_netns_cookie(struct sock *sk) 5091 { 5092 const struct net *net = sk ? sock_net(sk) : &init_net; 5093 5094 return net->net_cookie; 5095 } 5096 5097 BPF_CALL_1(bpf_get_netns_cookie_sock, struct sock *, ctx) 5098 { 5099 return __bpf_get_netns_cookie(ctx); 5100 } 5101 5102 static const struct bpf_func_proto bpf_get_netns_cookie_sock_proto = { 5103 .func = bpf_get_netns_cookie_sock, 5104 .gpl_only = false, 5105 .ret_type = RET_INTEGER, 5106 .arg1_type = ARG_PTR_TO_CTX_OR_NULL, 5107 }; 5108 5109 BPF_CALL_1(bpf_get_netns_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx) 5110 { 5111 return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL); 5112 } 5113 5114 static const struct bpf_func_proto bpf_get_netns_cookie_sock_addr_proto = { 5115 .func = bpf_get_netns_cookie_sock_addr, 5116 .gpl_only = false, 5117 .ret_type = RET_INTEGER, 5118 .arg1_type = ARG_PTR_TO_CTX_OR_NULL, 5119 }; 5120 5121 BPF_CALL_1(bpf_get_netns_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx) 5122 { 5123 return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL); 5124 } 5125 5126 static const struct bpf_func_proto bpf_get_netns_cookie_sock_ops_proto = { 5127 .func = bpf_get_netns_cookie_sock_ops, 5128 .gpl_only = false, 5129 .ret_type = RET_INTEGER, 5130 .arg1_type = ARG_PTR_TO_CTX_OR_NULL, 5131 }; 5132 5133 BPF_CALL_1(bpf_get_netns_cookie_sk_msg, struct sk_msg *, ctx) 5134 { 5135 return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL); 5136 } 5137 5138 static const struct bpf_func_proto bpf_get_netns_cookie_sk_msg_proto = { 5139 .func = bpf_get_netns_cookie_sk_msg, 5140 .gpl_only = false, 5141 .ret_type = RET_INTEGER, 5142 .arg1_type = ARG_PTR_TO_CTX_OR_NULL, 5143 }; 5144 5145 BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb) 5146 { 5147 struct sock *sk = sk_to_full_sk(skb->sk); 5148 kuid_t kuid; 5149 5150 if (!sk || !sk_fullsock(sk)) 5151 return overflowuid; 5152 kuid = sock_net_uid(sock_net(sk), sk); 5153 return from_kuid_munged(sock_net(sk)->user_ns, kuid); 5154 } 5155 5156 static const struct bpf_func_proto bpf_get_socket_uid_proto = { 5157 .func = bpf_get_socket_uid, 5158 .gpl_only = false, 5159 .ret_type = RET_INTEGER, 5160 .arg1_type = ARG_PTR_TO_CTX, 5161 }; 5162 5163 static int sol_socket_sockopt(struct sock *sk, int optname, 5164 char *optval, int *optlen, 5165 bool getopt) 5166 { 5167 switch (optname) { 5168 case SO_REUSEADDR: 5169 case SO_SNDBUF: 5170 case SO_RCVBUF: 5171 case SO_KEEPALIVE: 5172 case SO_PRIORITY: 5173 case SO_REUSEPORT: 5174 case SO_RCVLOWAT: 5175 case SO_MARK: 5176 case SO_MAX_PACING_RATE: 5177 case SO_BINDTOIFINDEX: 5178 case SO_TXREHASH: 5179 if (*optlen != sizeof(int)) 5180 return -EINVAL; 5181 break; 5182 case SO_BINDTODEVICE: 5183 break; 5184 default: 5185 return -EINVAL; 5186 } 5187 5188 if (getopt) { 5189 if (optname == SO_BINDTODEVICE) 5190 return -EINVAL; 5191 return sk_getsockopt(sk, SOL_SOCKET, optname, 5192 KERNEL_SOCKPTR(optval), 5193 KERNEL_SOCKPTR(optlen)); 5194 } 5195 5196 return sk_setsockopt(sk, SOL_SOCKET, optname, 5197 KERNEL_SOCKPTR(optval), *optlen); 5198 } 5199 5200 static int bpf_sol_tcp_setsockopt(struct sock *sk, int optname, 5201 char *optval, int optlen) 5202 { 5203 struct tcp_sock *tp = tcp_sk(sk); 5204 unsigned long timeout; 5205 int val; 5206 5207 if (optlen != sizeof(int)) 5208 return -EINVAL; 5209 5210 val = *(int *)optval; 5211 5212 /* Only some options are supported */ 5213 switch (optname) { 5214 case TCP_BPF_IW: 5215 if (val <= 0 || tp->data_segs_out > tp->syn_data) 5216 return -EINVAL; 5217 tcp_snd_cwnd_set(tp, val); 5218 break; 5219 case TCP_BPF_SNDCWND_CLAMP: 5220 if (val <= 0) 5221 return -EINVAL; 5222 tp->snd_cwnd_clamp = val; 5223 tp->snd_ssthresh = val; 5224 break; 5225 case TCP_BPF_DELACK_MAX: 5226 timeout = usecs_to_jiffies(val); 5227 if (timeout > TCP_DELACK_MAX || 5228 timeout < TCP_TIMEOUT_MIN) 5229 return -EINVAL; 5230 inet_csk(sk)->icsk_delack_max = timeout; 5231 break; 5232 case TCP_BPF_RTO_MIN: 5233 timeout = usecs_to_jiffies(val); 5234 if (timeout > TCP_RTO_MIN || 5235 timeout < TCP_TIMEOUT_MIN) 5236 return -EINVAL; 5237 inet_csk(sk)->icsk_rto_min = timeout; 5238 break; 5239 default: 5240 return -EINVAL; 5241 } 5242 5243 return 0; 5244 } 5245 5246 static int sol_tcp_sockopt_congestion(struct sock *sk, char *optval, 5247 int *optlen, bool getopt) 5248 { 5249 struct tcp_sock *tp; 5250 int ret; 5251 5252 if (*optlen < 2) 5253 return -EINVAL; 5254 5255 if (getopt) { 5256 if (!inet_csk(sk)->icsk_ca_ops) 5257 return -EINVAL; 5258 /* BPF expects NULL-terminated tcp-cc string */ 5259 optval[--(*optlen)] = '\0'; 5260 return do_tcp_getsockopt(sk, SOL_TCP, TCP_CONGESTION, 5261 KERNEL_SOCKPTR(optval), 5262 KERNEL_SOCKPTR(optlen)); 5263 } 5264 5265 /* "cdg" is the only cc that alloc a ptr 5266 * in inet_csk_ca area. The bpf-tcp-cc may 5267 * overwrite this ptr after switching to cdg. 5268 */ 5269 if (*optlen >= sizeof("cdg") - 1 && !strncmp("cdg", optval, *optlen)) 5270 return -ENOTSUPP; 5271 5272 /* It stops this looping 5273 * 5274 * .init => bpf_setsockopt(tcp_cc) => .init => 5275 * bpf_setsockopt(tcp_cc)" => .init => .... 5276 * 5277 * The second bpf_setsockopt(tcp_cc) is not allowed 5278 * in order to break the loop when both .init 5279 * are the same bpf prog. 5280 * 5281 * This applies even the second bpf_setsockopt(tcp_cc) 5282 * does not cause a loop. This limits only the first 5283 * '.init' can call bpf_setsockopt(TCP_CONGESTION) to 5284 * pick a fallback cc (eg. peer does not support ECN) 5285 * and the second '.init' cannot fallback to 5286 * another. 5287 */ 5288 tp = tcp_sk(sk); 5289 if (tp->bpf_chg_cc_inprogress) 5290 return -EBUSY; 5291 5292 tp->bpf_chg_cc_inprogress = 1; 5293 ret = do_tcp_setsockopt(sk, SOL_TCP, TCP_CONGESTION, 5294 KERNEL_SOCKPTR(optval), *optlen); 5295 tp->bpf_chg_cc_inprogress = 0; 5296 return ret; 5297 } 5298 5299 static int sol_tcp_sockopt(struct sock *sk, int optname, 5300 char *optval, int *optlen, 5301 bool getopt) 5302 { 5303 if (sk->sk_protocol != IPPROTO_TCP) 5304 return -EINVAL; 5305 5306 switch (optname) { 5307 case TCP_NODELAY: 5308 case TCP_MAXSEG: 5309 case TCP_KEEPIDLE: 5310 case TCP_KEEPINTVL: 5311 case TCP_KEEPCNT: 5312 case TCP_SYNCNT: 5313 case TCP_WINDOW_CLAMP: 5314 case TCP_THIN_LINEAR_TIMEOUTS: 5315 case TCP_USER_TIMEOUT: 5316 case TCP_NOTSENT_LOWAT: 5317 case TCP_SAVE_SYN: 5318 if (*optlen != sizeof(int)) 5319 return -EINVAL; 5320 break; 5321 case TCP_CONGESTION: 5322 return sol_tcp_sockopt_congestion(sk, optval, optlen, getopt); 5323 case TCP_SAVED_SYN: 5324 if (*optlen < 1) 5325 return -EINVAL; 5326 break; 5327 default: 5328 if (getopt) 5329 return -EINVAL; 5330 return bpf_sol_tcp_setsockopt(sk, optname, optval, *optlen); 5331 } 5332 5333 if (getopt) { 5334 if (optname == TCP_SAVED_SYN) { 5335 struct tcp_sock *tp = tcp_sk(sk); 5336 5337 if (!tp->saved_syn || 5338 *optlen > tcp_saved_syn_len(tp->saved_syn)) 5339 return -EINVAL; 5340 memcpy(optval, tp->saved_syn->data, *optlen); 5341 /* It cannot free tp->saved_syn here because it 5342 * does not know if the user space still needs it. 5343 */ 5344 return 0; 5345 } 5346 5347 return do_tcp_getsockopt(sk, SOL_TCP, optname, 5348 KERNEL_SOCKPTR(optval), 5349 KERNEL_SOCKPTR(optlen)); 5350 } 5351 5352 return do_tcp_setsockopt(sk, SOL_TCP, optname, 5353 KERNEL_SOCKPTR(optval), *optlen); 5354 } 5355 5356 static int sol_ip_sockopt(struct sock *sk, int optname, 5357 char *optval, int *optlen, 5358 bool getopt) 5359 { 5360 if (sk->sk_family != AF_INET) 5361 return -EINVAL; 5362 5363 switch (optname) { 5364 case IP_TOS: 5365 if (*optlen != sizeof(int)) 5366 return -EINVAL; 5367 break; 5368 default: 5369 return -EINVAL; 5370 } 5371 5372 if (getopt) 5373 return do_ip_getsockopt(sk, SOL_IP, optname, 5374 KERNEL_SOCKPTR(optval), 5375 KERNEL_SOCKPTR(optlen)); 5376 5377 return do_ip_setsockopt(sk, SOL_IP, optname, 5378 KERNEL_SOCKPTR(optval), *optlen); 5379 } 5380 5381 static int sol_ipv6_sockopt(struct sock *sk, int optname, 5382 char *optval, int *optlen, 5383 bool getopt) 5384 { 5385 if (sk->sk_family != AF_INET6) 5386 return -EINVAL; 5387 5388 switch (optname) { 5389 case IPV6_TCLASS: 5390 case IPV6_AUTOFLOWLABEL: 5391 if (*optlen != sizeof(int)) 5392 return -EINVAL; 5393 break; 5394 default: 5395 return -EINVAL; 5396 } 5397 5398 if (getopt) 5399 return ipv6_bpf_stub->ipv6_getsockopt(sk, SOL_IPV6, optname, 5400 KERNEL_SOCKPTR(optval), 5401 KERNEL_SOCKPTR(optlen)); 5402 5403 return ipv6_bpf_stub->ipv6_setsockopt(sk, SOL_IPV6, optname, 5404 KERNEL_SOCKPTR(optval), *optlen); 5405 } 5406 5407 static int __bpf_setsockopt(struct sock *sk, int level, int optname, 5408 char *optval, int optlen) 5409 { 5410 if (!sk_fullsock(sk)) 5411 return -EINVAL; 5412 5413 if (level == SOL_SOCKET) 5414 return sol_socket_sockopt(sk, optname, optval, &optlen, false); 5415 else if (IS_ENABLED(CONFIG_INET) && level == SOL_IP) 5416 return sol_ip_sockopt(sk, optname, optval, &optlen, false); 5417 else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6) 5418 return sol_ipv6_sockopt(sk, optname, optval, &optlen, false); 5419 else if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP) 5420 return sol_tcp_sockopt(sk, optname, optval, &optlen, false); 5421 5422 return -EINVAL; 5423 } 5424 5425 static int _bpf_setsockopt(struct sock *sk, int level, int optname, 5426 char *optval, int optlen) 5427 { 5428 if (sk_fullsock(sk)) 5429 sock_owned_by_me(sk); 5430 return __bpf_setsockopt(sk, level, optname, optval, optlen); 5431 } 5432 5433 static int __bpf_getsockopt(struct sock *sk, int level, int optname, 5434 char *optval, int optlen) 5435 { 5436 int err, saved_optlen = optlen; 5437 5438 if (!sk_fullsock(sk)) { 5439 err = -EINVAL; 5440 goto done; 5441 } 5442 5443 if (level == SOL_SOCKET) 5444 err = sol_socket_sockopt(sk, optname, optval, &optlen, true); 5445 else if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP) 5446 err = sol_tcp_sockopt(sk, optname, optval, &optlen, true); 5447 else if (IS_ENABLED(CONFIG_INET) && level == SOL_IP) 5448 err = sol_ip_sockopt(sk, optname, optval, &optlen, true); 5449 else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6) 5450 err = sol_ipv6_sockopt(sk, optname, optval, &optlen, true); 5451 else 5452 err = -EINVAL; 5453 5454 done: 5455 if (err) 5456 optlen = 0; 5457 if (optlen < saved_optlen) 5458 memset(optval + optlen, 0, saved_optlen - optlen); 5459 return err; 5460 } 5461 5462 static int _bpf_getsockopt(struct sock *sk, int level, int optname, 5463 char *optval, int optlen) 5464 { 5465 if (sk_fullsock(sk)) 5466 sock_owned_by_me(sk); 5467 return __bpf_getsockopt(sk, level, optname, optval, optlen); 5468 } 5469 5470 BPF_CALL_5(bpf_sk_setsockopt, struct sock *, sk, int, level, 5471 int, optname, char *, optval, int, optlen) 5472 { 5473 return _bpf_setsockopt(sk, level, optname, optval, optlen); 5474 } 5475 5476 const struct bpf_func_proto bpf_sk_setsockopt_proto = { 5477 .func = bpf_sk_setsockopt, 5478 .gpl_only = false, 5479 .ret_type = RET_INTEGER, 5480 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 5481 .arg2_type = ARG_ANYTHING, 5482 .arg3_type = ARG_ANYTHING, 5483 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5484 .arg5_type = ARG_CONST_SIZE, 5485 }; 5486 5487 BPF_CALL_5(bpf_sk_getsockopt, struct sock *, sk, int, level, 5488 int, optname, char *, optval, int, optlen) 5489 { 5490 return _bpf_getsockopt(sk, level, optname, optval, optlen); 5491 } 5492 5493 const struct bpf_func_proto bpf_sk_getsockopt_proto = { 5494 .func = bpf_sk_getsockopt, 5495 .gpl_only = false, 5496 .ret_type = RET_INTEGER, 5497 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 5498 .arg2_type = ARG_ANYTHING, 5499 .arg3_type = ARG_ANYTHING, 5500 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 5501 .arg5_type = ARG_CONST_SIZE, 5502 }; 5503 5504 BPF_CALL_5(bpf_unlocked_sk_setsockopt, struct sock *, sk, int, level, 5505 int, optname, char *, optval, int, optlen) 5506 { 5507 return __bpf_setsockopt(sk, level, optname, optval, optlen); 5508 } 5509 5510 const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto = { 5511 .func = bpf_unlocked_sk_setsockopt, 5512 .gpl_only = false, 5513 .ret_type = RET_INTEGER, 5514 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 5515 .arg2_type = ARG_ANYTHING, 5516 .arg3_type = ARG_ANYTHING, 5517 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5518 .arg5_type = ARG_CONST_SIZE, 5519 }; 5520 5521 BPF_CALL_5(bpf_unlocked_sk_getsockopt, struct sock *, sk, int, level, 5522 int, optname, char *, optval, int, optlen) 5523 { 5524 return __bpf_getsockopt(sk, level, optname, optval, optlen); 5525 } 5526 5527 const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto = { 5528 .func = bpf_unlocked_sk_getsockopt, 5529 .gpl_only = false, 5530 .ret_type = RET_INTEGER, 5531 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 5532 .arg2_type = ARG_ANYTHING, 5533 .arg3_type = ARG_ANYTHING, 5534 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 5535 .arg5_type = ARG_CONST_SIZE, 5536 }; 5537 5538 BPF_CALL_5(bpf_sock_addr_setsockopt, struct bpf_sock_addr_kern *, ctx, 5539 int, level, int, optname, char *, optval, int, optlen) 5540 { 5541 return _bpf_setsockopt(ctx->sk, level, optname, optval, optlen); 5542 } 5543 5544 static const struct bpf_func_proto bpf_sock_addr_setsockopt_proto = { 5545 .func = bpf_sock_addr_setsockopt, 5546 .gpl_only = false, 5547 .ret_type = RET_INTEGER, 5548 .arg1_type = ARG_PTR_TO_CTX, 5549 .arg2_type = ARG_ANYTHING, 5550 .arg3_type = ARG_ANYTHING, 5551 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5552 .arg5_type = ARG_CONST_SIZE, 5553 }; 5554 5555 BPF_CALL_5(bpf_sock_addr_getsockopt, struct bpf_sock_addr_kern *, ctx, 5556 int, level, int, optname, char *, optval, int, optlen) 5557 { 5558 return _bpf_getsockopt(ctx->sk, level, optname, optval, optlen); 5559 } 5560 5561 static const struct bpf_func_proto bpf_sock_addr_getsockopt_proto = { 5562 .func = bpf_sock_addr_getsockopt, 5563 .gpl_only = false, 5564 .ret_type = RET_INTEGER, 5565 .arg1_type = ARG_PTR_TO_CTX, 5566 .arg2_type = ARG_ANYTHING, 5567 .arg3_type = ARG_ANYTHING, 5568 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 5569 .arg5_type = ARG_CONST_SIZE, 5570 }; 5571 5572 BPF_CALL_5(bpf_sock_ops_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, 5573 int, level, int, optname, char *, optval, int, optlen) 5574 { 5575 return _bpf_setsockopt(bpf_sock->sk, level, optname, optval, optlen); 5576 } 5577 5578 static const struct bpf_func_proto bpf_sock_ops_setsockopt_proto = { 5579 .func = bpf_sock_ops_setsockopt, 5580 .gpl_only = false, 5581 .ret_type = RET_INTEGER, 5582 .arg1_type = ARG_PTR_TO_CTX, 5583 .arg2_type = ARG_ANYTHING, 5584 .arg3_type = ARG_ANYTHING, 5585 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5586 .arg5_type = ARG_CONST_SIZE, 5587 }; 5588 5589 static int bpf_sock_ops_get_syn(struct bpf_sock_ops_kern *bpf_sock, 5590 int optname, const u8 **start) 5591 { 5592 struct sk_buff *syn_skb = bpf_sock->syn_skb; 5593 const u8 *hdr_start; 5594 int ret; 5595 5596 if (syn_skb) { 5597 /* sk is a request_sock here */ 5598 5599 if (optname == TCP_BPF_SYN) { 5600 hdr_start = syn_skb->data; 5601 ret = tcp_hdrlen(syn_skb); 5602 } else if (optname == TCP_BPF_SYN_IP) { 5603 hdr_start = skb_network_header(syn_skb); 5604 ret = skb_network_header_len(syn_skb) + 5605 tcp_hdrlen(syn_skb); 5606 } else { 5607 /* optname == TCP_BPF_SYN_MAC */ 5608 hdr_start = skb_mac_header(syn_skb); 5609 ret = skb_mac_header_len(syn_skb) + 5610 skb_network_header_len(syn_skb) + 5611 tcp_hdrlen(syn_skb); 5612 } 5613 } else { 5614 struct sock *sk = bpf_sock->sk; 5615 struct saved_syn *saved_syn; 5616 5617 if (sk->sk_state == TCP_NEW_SYN_RECV) 5618 /* synack retransmit. bpf_sock->syn_skb will 5619 * not be available. It has to resort to 5620 * saved_syn (if it is saved). 5621 */ 5622 saved_syn = inet_reqsk(sk)->saved_syn; 5623 else 5624 saved_syn = tcp_sk(sk)->saved_syn; 5625 5626 if (!saved_syn) 5627 return -ENOENT; 5628 5629 if (optname == TCP_BPF_SYN) { 5630 hdr_start = saved_syn->data + 5631 saved_syn->mac_hdrlen + 5632 saved_syn->network_hdrlen; 5633 ret = saved_syn->tcp_hdrlen; 5634 } else if (optname == TCP_BPF_SYN_IP) { 5635 hdr_start = saved_syn->data + 5636 saved_syn->mac_hdrlen; 5637 ret = saved_syn->network_hdrlen + 5638 saved_syn->tcp_hdrlen; 5639 } else { 5640 /* optname == TCP_BPF_SYN_MAC */ 5641 5642 /* TCP_SAVE_SYN may not have saved the mac hdr */ 5643 if (!saved_syn->mac_hdrlen) 5644 return -ENOENT; 5645 5646 hdr_start = saved_syn->data; 5647 ret = saved_syn->mac_hdrlen + 5648 saved_syn->network_hdrlen + 5649 saved_syn->tcp_hdrlen; 5650 } 5651 } 5652 5653 *start = hdr_start; 5654 return ret; 5655 } 5656 5657 BPF_CALL_5(bpf_sock_ops_getsockopt, struct bpf_sock_ops_kern *, bpf_sock, 5658 int, level, int, optname, char *, optval, int, optlen) 5659 { 5660 if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP && 5661 optname >= TCP_BPF_SYN && optname <= TCP_BPF_SYN_MAC) { 5662 int ret, copy_len = 0; 5663 const u8 *start; 5664 5665 ret = bpf_sock_ops_get_syn(bpf_sock, optname, &start); 5666 if (ret > 0) { 5667 copy_len = ret; 5668 if (optlen < copy_len) { 5669 copy_len = optlen; 5670 ret = -ENOSPC; 5671 } 5672 5673 memcpy(optval, start, copy_len); 5674 } 5675 5676 /* Zero out unused buffer at the end */ 5677 memset(optval + copy_len, 0, optlen - copy_len); 5678 5679 return ret; 5680 } 5681 5682 return _bpf_getsockopt(bpf_sock->sk, level, optname, optval, optlen); 5683 } 5684 5685 static const struct bpf_func_proto bpf_sock_ops_getsockopt_proto = { 5686 .func = bpf_sock_ops_getsockopt, 5687 .gpl_only = false, 5688 .ret_type = RET_INTEGER, 5689 .arg1_type = ARG_PTR_TO_CTX, 5690 .arg2_type = ARG_ANYTHING, 5691 .arg3_type = ARG_ANYTHING, 5692 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 5693 .arg5_type = ARG_CONST_SIZE, 5694 }; 5695 5696 BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock, 5697 int, argval) 5698 { 5699 struct sock *sk = bpf_sock->sk; 5700 int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS; 5701 5702 if (!IS_ENABLED(CONFIG_INET) || !sk_fullsock(sk)) 5703 return -EINVAL; 5704 5705 tcp_sk(sk)->bpf_sock_ops_cb_flags = val; 5706 5707 return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS); 5708 } 5709 5710 static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = { 5711 .func = bpf_sock_ops_cb_flags_set, 5712 .gpl_only = false, 5713 .ret_type = RET_INTEGER, 5714 .arg1_type = ARG_PTR_TO_CTX, 5715 .arg2_type = ARG_ANYTHING, 5716 }; 5717 5718 const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly; 5719 EXPORT_SYMBOL_GPL(ipv6_bpf_stub); 5720 5721 BPF_CALL_3(bpf_bind, struct bpf_sock_addr_kern *, ctx, struct sockaddr *, addr, 5722 int, addr_len) 5723 { 5724 #ifdef CONFIG_INET 5725 struct sock *sk = ctx->sk; 5726 u32 flags = BIND_FROM_BPF; 5727 int err; 5728 5729 err = -EINVAL; 5730 if (addr_len < offsetofend(struct sockaddr, sa_family)) 5731 return err; 5732 if (addr->sa_family == AF_INET) { 5733 if (addr_len < sizeof(struct sockaddr_in)) 5734 return err; 5735 if (((struct sockaddr_in *)addr)->sin_port == htons(0)) 5736 flags |= BIND_FORCE_ADDRESS_NO_PORT; 5737 return __inet_bind(sk, addr, addr_len, flags); 5738 #if IS_ENABLED(CONFIG_IPV6) 5739 } else if (addr->sa_family == AF_INET6) { 5740 if (addr_len < SIN6_LEN_RFC2133) 5741 return err; 5742 if (((struct sockaddr_in6 *)addr)->sin6_port == htons(0)) 5743 flags |= BIND_FORCE_ADDRESS_NO_PORT; 5744 /* ipv6_bpf_stub cannot be NULL, since it's called from 5745 * bpf_cgroup_inet6_connect hook and ipv6 is already loaded 5746 */ 5747 return ipv6_bpf_stub->inet6_bind(sk, addr, addr_len, flags); 5748 #endif /* CONFIG_IPV6 */ 5749 } 5750 #endif /* CONFIG_INET */ 5751 5752 return -EAFNOSUPPORT; 5753 } 5754 5755 static const struct bpf_func_proto bpf_bind_proto = { 5756 .func = bpf_bind, 5757 .gpl_only = false, 5758 .ret_type = RET_INTEGER, 5759 .arg1_type = ARG_PTR_TO_CTX, 5760 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5761 .arg3_type = ARG_CONST_SIZE, 5762 }; 5763 5764 #ifdef CONFIG_XFRM 5765 5766 #if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \ 5767 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES)) 5768 5769 struct metadata_dst __percpu *xfrm_bpf_md_dst; 5770 EXPORT_SYMBOL_GPL(xfrm_bpf_md_dst); 5771 5772 #endif 5773 5774 BPF_CALL_5(bpf_skb_get_xfrm_state, struct sk_buff *, skb, u32, index, 5775 struct bpf_xfrm_state *, to, u32, size, u64, flags) 5776 { 5777 const struct sec_path *sp = skb_sec_path(skb); 5778 const struct xfrm_state *x; 5779 5780 if (!sp || unlikely(index >= sp->len || flags)) 5781 goto err_clear; 5782 5783 x = sp->xvec[index]; 5784 5785 if (unlikely(size != sizeof(struct bpf_xfrm_state))) 5786 goto err_clear; 5787 5788 to->reqid = x->props.reqid; 5789 to->spi = x->id.spi; 5790 to->family = x->props.family; 5791 to->ext = 0; 5792 5793 if (to->family == AF_INET6) { 5794 memcpy(to->remote_ipv6, x->props.saddr.a6, 5795 sizeof(to->remote_ipv6)); 5796 } else { 5797 to->remote_ipv4 = x->props.saddr.a4; 5798 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); 5799 } 5800 5801 return 0; 5802 err_clear: 5803 memset(to, 0, size); 5804 return -EINVAL; 5805 } 5806 5807 static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto = { 5808 .func = bpf_skb_get_xfrm_state, 5809 .gpl_only = false, 5810 .ret_type = RET_INTEGER, 5811 .arg1_type = ARG_PTR_TO_CTX, 5812 .arg2_type = ARG_ANYTHING, 5813 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 5814 .arg4_type = ARG_CONST_SIZE, 5815 .arg5_type = ARG_ANYTHING, 5816 }; 5817 #endif 5818 5819 #if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6) 5820 static int bpf_fib_set_fwd_params(struct bpf_fib_lookup *params, u32 mtu) 5821 { 5822 params->h_vlan_TCI = 0; 5823 params->h_vlan_proto = 0; 5824 if (mtu) 5825 params->mtu_result = mtu; /* union with tot_len */ 5826 5827 return 0; 5828 } 5829 #endif 5830 5831 #if IS_ENABLED(CONFIG_INET) 5832 static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params, 5833 u32 flags, bool check_mtu) 5834 { 5835 struct fib_nh_common *nhc; 5836 struct in_device *in_dev; 5837 struct neighbour *neigh; 5838 struct net_device *dev; 5839 struct fib_result res; 5840 struct flowi4 fl4; 5841 u32 mtu = 0; 5842 int err; 5843 5844 dev = dev_get_by_index_rcu(net, params->ifindex); 5845 if (unlikely(!dev)) 5846 return -ENODEV; 5847 5848 /* verify forwarding is enabled on this interface */ 5849 in_dev = __in_dev_get_rcu(dev); 5850 if (unlikely(!in_dev || !IN_DEV_FORWARD(in_dev))) 5851 return BPF_FIB_LKUP_RET_FWD_DISABLED; 5852 5853 if (flags & BPF_FIB_LOOKUP_OUTPUT) { 5854 fl4.flowi4_iif = 1; 5855 fl4.flowi4_oif = params->ifindex; 5856 } else { 5857 fl4.flowi4_iif = params->ifindex; 5858 fl4.flowi4_oif = 0; 5859 } 5860 fl4.flowi4_tos = params->tos & IPTOS_RT_MASK; 5861 fl4.flowi4_scope = RT_SCOPE_UNIVERSE; 5862 fl4.flowi4_flags = 0; 5863 5864 fl4.flowi4_proto = params->l4_protocol; 5865 fl4.daddr = params->ipv4_dst; 5866 fl4.saddr = params->ipv4_src; 5867 fl4.fl4_sport = params->sport; 5868 fl4.fl4_dport = params->dport; 5869 fl4.flowi4_multipath_hash = 0; 5870 5871 if (flags & BPF_FIB_LOOKUP_DIRECT) { 5872 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; 5873 struct fib_table *tb; 5874 5875 if (flags & BPF_FIB_LOOKUP_TBID) { 5876 tbid = params->tbid; 5877 /* zero out for vlan output */ 5878 params->tbid = 0; 5879 } 5880 5881 tb = fib_get_table(net, tbid); 5882 if (unlikely(!tb)) 5883 return BPF_FIB_LKUP_RET_NOT_FWDED; 5884 5885 err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); 5886 } else { 5887 fl4.flowi4_mark = 0; 5888 fl4.flowi4_secid = 0; 5889 fl4.flowi4_tun_key.tun_id = 0; 5890 fl4.flowi4_uid = sock_net_uid(net, NULL); 5891 5892 err = fib_lookup(net, &fl4, &res, FIB_LOOKUP_NOREF); 5893 } 5894 5895 if (err) { 5896 /* map fib lookup errors to RTN_ type */ 5897 if (err == -EINVAL) 5898 return BPF_FIB_LKUP_RET_BLACKHOLE; 5899 if (err == -EHOSTUNREACH) 5900 return BPF_FIB_LKUP_RET_UNREACHABLE; 5901 if (err == -EACCES) 5902 return BPF_FIB_LKUP_RET_PROHIBIT; 5903 5904 return BPF_FIB_LKUP_RET_NOT_FWDED; 5905 } 5906 5907 if (res.type != RTN_UNICAST) 5908 return BPF_FIB_LKUP_RET_NOT_FWDED; 5909 5910 if (fib_info_num_path(res.fi) > 1) 5911 fib_select_path(net, &res, &fl4, NULL); 5912 5913 if (check_mtu) { 5914 mtu = ip_mtu_from_fib_result(&res, params->ipv4_dst); 5915 if (params->tot_len > mtu) { 5916 params->mtu_result = mtu; /* union with tot_len */ 5917 return BPF_FIB_LKUP_RET_FRAG_NEEDED; 5918 } 5919 } 5920 5921 nhc = res.nhc; 5922 5923 /* do not handle lwt encaps right now */ 5924 if (nhc->nhc_lwtstate) 5925 return BPF_FIB_LKUP_RET_UNSUPP_LWT; 5926 5927 dev = nhc->nhc_dev; 5928 5929 params->rt_metric = res.fi->fib_priority; 5930 params->ifindex = dev->ifindex; 5931 5932 if (flags & BPF_FIB_LOOKUP_SRC) 5933 params->ipv4_src = fib_result_prefsrc(net, &res); 5934 5935 /* xdp and cls_bpf programs are run in RCU-bh so 5936 * rcu_read_lock_bh is not needed here 5937 */ 5938 if (likely(nhc->nhc_gw_family != AF_INET6)) { 5939 if (nhc->nhc_gw_family) 5940 params->ipv4_dst = nhc->nhc_gw.ipv4; 5941 } else { 5942 struct in6_addr *dst = (struct in6_addr *)params->ipv6_dst; 5943 5944 params->family = AF_INET6; 5945 *dst = nhc->nhc_gw.ipv6; 5946 } 5947 5948 if (flags & BPF_FIB_LOOKUP_SKIP_NEIGH) 5949 goto set_fwd_params; 5950 5951 if (likely(nhc->nhc_gw_family != AF_INET6)) 5952 neigh = __ipv4_neigh_lookup_noref(dev, 5953 (__force u32)params->ipv4_dst); 5954 else 5955 neigh = __ipv6_neigh_lookup_noref_stub(dev, params->ipv6_dst); 5956 5957 if (!neigh || !(READ_ONCE(neigh->nud_state) & NUD_VALID)) 5958 return BPF_FIB_LKUP_RET_NO_NEIGH; 5959 memcpy(params->dmac, neigh->ha, ETH_ALEN); 5960 memcpy(params->smac, dev->dev_addr, ETH_ALEN); 5961 5962 set_fwd_params: 5963 return bpf_fib_set_fwd_params(params, mtu); 5964 } 5965 #endif 5966 5967 #if IS_ENABLED(CONFIG_IPV6) 5968 static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params, 5969 u32 flags, bool check_mtu) 5970 { 5971 struct in6_addr *src = (struct in6_addr *) params->ipv6_src; 5972 struct in6_addr *dst = (struct in6_addr *) params->ipv6_dst; 5973 struct fib6_result res = {}; 5974 struct neighbour *neigh; 5975 struct net_device *dev; 5976 struct inet6_dev *idev; 5977 struct flowi6 fl6; 5978 int strict = 0; 5979 int oif, err; 5980 u32 mtu = 0; 5981 5982 /* link local addresses are never forwarded */ 5983 if (rt6_need_strict(dst) || rt6_need_strict(src)) 5984 return BPF_FIB_LKUP_RET_NOT_FWDED; 5985 5986 dev = dev_get_by_index_rcu(net, params->ifindex); 5987 if (unlikely(!dev)) 5988 return -ENODEV; 5989 5990 idev = __in6_dev_get_safely(dev); 5991 if (unlikely(!idev || !idev->cnf.forwarding)) 5992 return BPF_FIB_LKUP_RET_FWD_DISABLED; 5993 5994 if (flags & BPF_FIB_LOOKUP_OUTPUT) { 5995 fl6.flowi6_iif = 1; 5996 oif = fl6.flowi6_oif = params->ifindex; 5997 } else { 5998 oif = fl6.flowi6_iif = params->ifindex; 5999 fl6.flowi6_oif = 0; 6000 strict = RT6_LOOKUP_F_HAS_SADDR; 6001 } 6002 fl6.flowlabel = params->flowinfo; 6003 fl6.flowi6_scope = 0; 6004 fl6.flowi6_flags = 0; 6005 fl6.mp_hash = 0; 6006 6007 fl6.flowi6_proto = params->l4_protocol; 6008 fl6.daddr = *dst; 6009 fl6.saddr = *src; 6010 fl6.fl6_sport = params->sport; 6011 fl6.fl6_dport = params->dport; 6012 6013 if (flags & BPF_FIB_LOOKUP_DIRECT) { 6014 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; 6015 struct fib6_table *tb; 6016 6017 if (flags & BPF_FIB_LOOKUP_TBID) { 6018 tbid = params->tbid; 6019 /* zero out for vlan output */ 6020 params->tbid = 0; 6021 } 6022 6023 tb = ipv6_stub->fib6_get_table(net, tbid); 6024 if (unlikely(!tb)) 6025 return BPF_FIB_LKUP_RET_NOT_FWDED; 6026 6027 err = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6, &res, 6028 strict); 6029 } else { 6030 fl6.flowi6_mark = 0; 6031 fl6.flowi6_secid = 0; 6032 fl6.flowi6_tun_key.tun_id = 0; 6033 fl6.flowi6_uid = sock_net_uid(net, NULL); 6034 6035 err = ipv6_stub->fib6_lookup(net, oif, &fl6, &res, strict); 6036 } 6037 6038 if (unlikely(err || IS_ERR_OR_NULL(res.f6i) || 6039 res.f6i == net->ipv6.fib6_null_entry)) 6040 return BPF_FIB_LKUP_RET_NOT_FWDED; 6041 6042 switch (res.fib6_type) { 6043 /* only unicast is forwarded */ 6044 case RTN_UNICAST: 6045 break; 6046 case RTN_BLACKHOLE: 6047 return BPF_FIB_LKUP_RET_BLACKHOLE; 6048 case RTN_UNREACHABLE: 6049 return BPF_FIB_LKUP_RET_UNREACHABLE; 6050 case RTN_PROHIBIT: 6051 return BPF_FIB_LKUP_RET_PROHIBIT; 6052 default: 6053 return BPF_FIB_LKUP_RET_NOT_FWDED; 6054 } 6055 6056 ipv6_stub->fib6_select_path(net, &res, &fl6, fl6.flowi6_oif, 6057 fl6.flowi6_oif != 0, NULL, strict); 6058 6059 if (check_mtu) { 6060 mtu = ipv6_stub->ip6_mtu_from_fib6(&res, dst, src); 6061 if (params->tot_len > mtu) { 6062 params->mtu_result = mtu; /* union with tot_len */ 6063 return BPF_FIB_LKUP_RET_FRAG_NEEDED; 6064 } 6065 } 6066 6067 if (res.nh->fib_nh_lws) 6068 return BPF_FIB_LKUP_RET_UNSUPP_LWT; 6069 6070 if (res.nh->fib_nh_gw_family) 6071 *dst = res.nh->fib_nh_gw6; 6072 6073 dev = res.nh->fib_nh_dev; 6074 params->rt_metric = res.f6i->fib6_metric; 6075 params->ifindex = dev->ifindex; 6076 6077 if (flags & BPF_FIB_LOOKUP_SRC) { 6078 if (res.f6i->fib6_prefsrc.plen) { 6079 *src = res.f6i->fib6_prefsrc.addr; 6080 } else { 6081 err = ipv6_bpf_stub->ipv6_dev_get_saddr(net, dev, 6082 &fl6.daddr, 0, 6083 src); 6084 if (err) 6085 return BPF_FIB_LKUP_RET_NO_SRC_ADDR; 6086 } 6087 } 6088 6089 if (flags & BPF_FIB_LOOKUP_SKIP_NEIGH) 6090 goto set_fwd_params; 6091 6092 /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is 6093 * not needed here. 6094 */ 6095 neigh = __ipv6_neigh_lookup_noref_stub(dev, dst); 6096 if (!neigh || !(READ_ONCE(neigh->nud_state) & NUD_VALID)) 6097 return BPF_FIB_LKUP_RET_NO_NEIGH; 6098 memcpy(params->dmac, neigh->ha, ETH_ALEN); 6099 memcpy(params->smac, dev->dev_addr, ETH_ALEN); 6100 6101 set_fwd_params: 6102 return bpf_fib_set_fwd_params(params, mtu); 6103 } 6104 #endif 6105 6106 #define BPF_FIB_LOOKUP_MASK (BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT | \ 6107 BPF_FIB_LOOKUP_SKIP_NEIGH | BPF_FIB_LOOKUP_TBID | \ 6108 BPF_FIB_LOOKUP_SRC) 6109 6110 BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx, 6111 struct bpf_fib_lookup *, params, int, plen, u32, flags) 6112 { 6113 if (plen < sizeof(*params)) 6114 return -EINVAL; 6115 6116 if (flags & ~BPF_FIB_LOOKUP_MASK) 6117 return -EINVAL; 6118 6119 switch (params->family) { 6120 #if IS_ENABLED(CONFIG_INET) 6121 case AF_INET: 6122 return bpf_ipv4_fib_lookup(dev_net(ctx->rxq->dev), params, 6123 flags, true); 6124 #endif 6125 #if IS_ENABLED(CONFIG_IPV6) 6126 case AF_INET6: 6127 return bpf_ipv6_fib_lookup(dev_net(ctx->rxq->dev), params, 6128 flags, true); 6129 #endif 6130 } 6131 return -EAFNOSUPPORT; 6132 } 6133 6134 static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = { 6135 .func = bpf_xdp_fib_lookup, 6136 .gpl_only = true, 6137 .ret_type = RET_INTEGER, 6138 .arg1_type = ARG_PTR_TO_CTX, 6139 .arg2_type = ARG_PTR_TO_MEM, 6140 .arg3_type = ARG_CONST_SIZE, 6141 .arg4_type = ARG_ANYTHING, 6142 }; 6143 6144 BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb, 6145 struct bpf_fib_lookup *, params, int, plen, u32, flags) 6146 { 6147 struct net *net = dev_net(skb->dev); 6148 int rc = -EAFNOSUPPORT; 6149 bool check_mtu = false; 6150 6151 if (plen < sizeof(*params)) 6152 return -EINVAL; 6153 6154 if (flags & ~BPF_FIB_LOOKUP_MASK) 6155 return -EINVAL; 6156 6157 if (params->tot_len) 6158 check_mtu = true; 6159 6160 switch (params->family) { 6161 #if IS_ENABLED(CONFIG_INET) 6162 case AF_INET: 6163 rc = bpf_ipv4_fib_lookup(net, params, flags, check_mtu); 6164 break; 6165 #endif 6166 #if IS_ENABLED(CONFIG_IPV6) 6167 case AF_INET6: 6168 rc = bpf_ipv6_fib_lookup(net, params, flags, check_mtu); 6169 break; 6170 #endif 6171 } 6172 6173 if (rc == BPF_FIB_LKUP_RET_SUCCESS && !check_mtu) { 6174 struct net_device *dev; 6175 6176 /* When tot_len isn't provided by user, check skb 6177 * against MTU of FIB lookup resulting net_device 6178 */ 6179 dev = dev_get_by_index_rcu(net, params->ifindex); 6180 if (!is_skb_forwardable(dev, skb)) 6181 rc = BPF_FIB_LKUP_RET_FRAG_NEEDED; 6182 6183 params->mtu_result = dev->mtu; /* union with tot_len */ 6184 } 6185 6186 return rc; 6187 } 6188 6189 static const struct bpf_func_proto bpf_skb_fib_lookup_proto = { 6190 .func = bpf_skb_fib_lookup, 6191 .gpl_only = true, 6192 .ret_type = RET_INTEGER, 6193 .arg1_type = ARG_PTR_TO_CTX, 6194 .arg2_type = ARG_PTR_TO_MEM, 6195 .arg3_type = ARG_CONST_SIZE, 6196 .arg4_type = ARG_ANYTHING, 6197 }; 6198 6199 static struct net_device *__dev_via_ifindex(struct net_device *dev_curr, 6200 u32 ifindex) 6201 { 6202 struct net *netns = dev_net(dev_curr); 6203 6204 /* Non-redirect use-cases can use ifindex=0 and save ifindex lookup */ 6205 if (ifindex == 0) 6206 return dev_curr; 6207 6208 return dev_get_by_index_rcu(netns, ifindex); 6209 } 6210 6211 BPF_CALL_5(bpf_skb_check_mtu, struct sk_buff *, skb, 6212 u32, ifindex, u32 *, mtu_len, s32, len_diff, u64, flags) 6213 { 6214 int ret = BPF_MTU_CHK_RET_FRAG_NEEDED; 6215 struct net_device *dev = skb->dev; 6216 int skb_len, dev_len; 6217 int mtu; 6218 6219 if (unlikely(flags & ~(BPF_MTU_CHK_SEGS))) 6220 return -EINVAL; 6221 6222 if (unlikely(flags & BPF_MTU_CHK_SEGS && (len_diff || *mtu_len))) 6223 return -EINVAL; 6224 6225 dev = __dev_via_ifindex(dev, ifindex); 6226 if (unlikely(!dev)) 6227 return -ENODEV; 6228 6229 mtu = READ_ONCE(dev->mtu); 6230 6231 dev_len = mtu + dev->hard_header_len; 6232 6233 /* If set use *mtu_len as input, L3 as iph->tot_len (like fib_lookup) */ 6234 skb_len = *mtu_len ? *mtu_len + dev->hard_header_len : skb->len; 6235 6236 skb_len += len_diff; /* minus result pass check */ 6237 if (skb_len <= dev_len) { 6238 ret = BPF_MTU_CHK_RET_SUCCESS; 6239 goto out; 6240 } 6241 /* At this point, skb->len exceed MTU, but as it include length of all 6242 * segments, it can still be below MTU. The SKB can possibly get 6243 * re-segmented in transmit path (see validate_xmit_skb). Thus, user 6244 * must choose if segs are to be MTU checked. 6245 */ 6246 if (skb_is_gso(skb)) { 6247 ret = BPF_MTU_CHK_RET_SUCCESS; 6248 6249 if (flags & BPF_MTU_CHK_SEGS && 6250 !skb_gso_validate_network_len(skb, mtu)) 6251 ret = BPF_MTU_CHK_RET_SEGS_TOOBIG; 6252 } 6253 out: 6254 /* BPF verifier guarantees valid pointer */ 6255 *mtu_len = mtu; 6256 6257 return ret; 6258 } 6259 6260 BPF_CALL_5(bpf_xdp_check_mtu, struct xdp_buff *, xdp, 6261 u32, ifindex, u32 *, mtu_len, s32, len_diff, u64, flags) 6262 { 6263 struct net_device *dev = xdp->rxq->dev; 6264 int xdp_len = xdp->data_end - xdp->data; 6265 int ret = BPF_MTU_CHK_RET_SUCCESS; 6266 int mtu, dev_len; 6267 6268 /* XDP variant doesn't support multi-buffer segment check (yet) */ 6269 if (unlikely(flags)) 6270 return -EINVAL; 6271 6272 dev = __dev_via_ifindex(dev, ifindex); 6273 if (unlikely(!dev)) 6274 return -ENODEV; 6275 6276 mtu = READ_ONCE(dev->mtu); 6277 6278 /* Add L2-header as dev MTU is L3 size */ 6279 dev_len = mtu + dev->hard_header_len; 6280 6281 /* Use *mtu_len as input, L3 as iph->tot_len (like fib_lookup) */ 6282 if (*mtu_len) 6283 xdp_len = *mtu_len + dev->hard_header_len; 6284 6285 xdp_len += len_diff; /* minus result pass check */ 6286 if (xdp_len > dev_len) 6287 ret = BPF_MTU_CHK_RET_FRAG_NEEDED; 6288 6289 /* BPF verifier guarantees valid pointer */ 6290 *mtu_len = mtu; 6291 6292 return ret; 6293 } 6294 6295 static const struct bpf_func_proto bpf_skb_check_mtu_proto = { 6296 .func = bpf_skb_check_mtu, 6297 .gpl_only = true, 6298 .ret_type = RET_INTEGER, 6299 .arg1_type = ARG_PTR_TO_CTX, 6300 .arg2_type = ARG_ANYTHING, 6301 .arg3_type = ARG_PTR_TO_INT, 6302 .arg4_type = ARG_ANYTHING, 6303 .arg5_type = ARG_ANYTHING, 6304 }; 6305 6306 static const struct bpf_func_proto bpf_xdp_check_mtu_proto = { 6307 .func = bpf_xdp_check_mtu, 6308 .gpl_only = true, 6309 .ret_type = RET_INTEGER, 6310 .arg1_type = ARG_PTR_TO_CTX, 6311 .arg2_type = ARG_ANYTHING, 6312 .arg3_type = ARG_PTR_TO_INT, 6313 .arg4_type = ARG_ANYTHING, 6314 .arg5_type = ARG_ANYTHING, 6315 }; 6316 6317 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 6318 static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len) 6319 { 6320 int err; 6321 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)hdr; 6322 6323 if (!seg6_validate_srh(srh, len, false)) 6324 return -EINVAL; 6325 6326 switch (type) { 6327 case BPF_LWT_ENCAP_SEG6_INLINE: 6328 if (skb->protocol != htons(ETH_P_IPV6)) 6329 return -EBADMSG; 6330 6331 err = seg6_do_srh_inline(skb, srh); 6332 break; 6333 case BPF_LWT_ENCAP_SEG6: 6334 skb_reset_inner_headers(skb); 6335 skb->encapsulation = 1; 6336 err = seg6_do_srh_encap(skb, srh, IPPROTO_IPV6); 6337 break; 6338 default: 6339 return -EINVAL; 6340 } 6341 6342 bpf_compute_data_pointers(skb); 6343 if (err) 6344 return err; 6345 6346 skb_set_transport_header(skb, sizeof(struct ipv6hdr)); 6347 6348 return seg6_lookup_nexthop(skb, NULL, 0); 6349 } 6350 #endif /* CONFIG_IPV6_SEG6_BPF */ 6351 6352 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 6353 static int bpf_push_ip_encap(struct sk_buff *skb, void *hdr, u32 len, 6354 bool ingress) 6355 { 6356 return bpf_lwt_push_ip_encap(skb, hdr, len, ingress); 6357 } 6358 #endif 6359 6360 BPF_CALL_4(bpf_lwt_in_push_encap, struct sk_buff *, skb, u32, type, void *, hdr, 6361 u32, len) 6362 { 6363 switch (type) { 6364 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 6365 case BPF_LWT_ENCAP_SEG6: 6366 case BPF_LWT_ENCAP_SEG6_INLINE: 6367 return bpf_push_seg6_encap(skb, type, hdr, len); 6368 #endif 6369 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 6370 case BPF_LWT_ENCAP_IP: 6371 return bpf_push_ip_encap(skb, hdr, len, true /* ingress */); 6372 #endif 6373 default: 6374 return -EINVAL; 6375 } 6376 } 6377 6378 BPF_CALL_4(bpf_lwt_xmit_push_encap, struct sk_buff *, skb, u32, type, 6379 void *, hdr, u32, len) 6380 { 6381 switch (type) { 6382 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 6383 case BPF_LWT_ENCAP_IP: 6384 return bpf_push_ip_encap(skb, hdr, len, false /* egress */); 6385 #endif 6386 default: 6387 return -EINVAL; 6388 } 6389 } 6390 6391 static const struct bpf_func_proto bpf_lwt_in_push_encap_proto = { 6392 .func = bpf_lwt_in_push_encap, 6393 .gpl_only = false, 6394 .ret_type = RET_INTEGER, 6395 .arg1_type = ARG_PTR_TO_CTX, 6396 .arg2_type = ARG_ANYTHING, 6397 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6398 .arg4_type = ARG_CONST_SIZE 6399 }; 6400 6401 static const struct bpf_func_proto bpf_lwt_xmit_push_encap_proto = { 6402 .func = bpf_lwt_xmit_push_encap, 6403 .gpl_only = false, 6404 .ret_type = RET_INTEGER, 6405 .arg1_type = ARG_PTR_TO_CTX, 6406 .arg2_type = ARG_ANYTHING, 6407 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6408 .arg4_type = ARG_CONST_SIZE 6409 }; 6410 6411 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 6412 BPF_CALL_4(bpf_lwt_seg6_store_bytes, struct sk_buff *, skb, u32, offset, 6413 const void *, from, u32, len) 6414 { 6415 struct seg6_bpf_srh_state *srh_state = 6416 this_cpu_ptr(&seg6_bpf_srh_states); 6417 struct ipv6_sr_hdr *srh = srh_state->srh; 6418 void *srh_tlvs, *srh_end, *ptr; 6419 int srhoff = 0; 6420 6421 if (srh == NULL) 6422 return -EINVAL; 6423 6424 srh_tlvs = (void *)((char *)srh + ((srh->first_segment + 1) << 4)); 6425 srh_end = (void *)((char *)srh + sizeof(*srh) + srh_state->hdrlen); 6426 6427 ptr = skb->data + offset; 6428 if (ptr >= srh_tlvs && ptr + len <= srh_end) 6429 srh_state->valid = false; 6430 else if (ptr < (void *)&srh->flags || 6431 ptr + len > (void *)&srh->segments) 6432 return -EFAULT; 6433 6434 if (unlikely(bpf_try_make_writable(skb, offset + len))) 6435 return -EFAULT; 6436 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) 6437 return -EINVAL; 6438 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 6439 6440 memcpy(skb->data + offset, from, len); 6441 return 0; 6442 } 6443 6444 static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto = { 6445 .func = bpf_lwt_seg6_store_bytes, 6446 .gpl_only = false, 6447 .ret_type = RET_INTEGER, 6448 .arg1_type = ARG_PTR_TO_CTX, 6449 .arg2_type = ARG_ANYTHING, 6450 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6451 .arg4_type = ARG_CONST_SIZE 6452 }; 6453 6454 static void bpf_update_srh_state(struct sk_buff *skb) 6455 { 6456 struct seg6_bpf_srh_state *srh_state = 6457 this_cpu_ptr(&seg6_bpf_srh_states); 6458 int srhoff = 0; 6459 6460 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) { 6461 srh_state->srh = NULL; 6462 } else { 6463 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 6464 srh_state->hdrlen = srh_state->srh->hdrlen << 3; 6465 srh_state->valid = true; 6466 } 6467 } 6468 6469 BPF_CALL_4(bpf_lwt_seg6_action, struct sk_buff *, skb, 6470 u32, action, void *, param, u32, param_len) 6471 { 6472 struct seg6_bpf_srh_state *srh_state = 6473 this_cpu_ptr(&seg6_bpf_srh_states); 6474 int hdroff = 0; 6475 int err; 6476 6477 switch (action) { 6478 case SEG6_LOCAL_ACTION_END_X: 6479 if (!seg6_bpf_has_valid_srh(skb)) 6480 return -EBADMSG; 6481 if (param_len != sizeof(struct in6_addr)) 6482 return -EINVAL; 6483 return seg6_lookup_nexthop(skb, (struct in6_addr *)param, 0); 6484 case SEG6_LOCAL_ACTION_END_T: 6485 if (!seg6_bpf_has_valid_srh(skb)) 6486 return -EBADMSG; 6487 if (param_len != sizeof(int)) 6488 return -EINVAL; 6489 return seg6_lookup_nexthop(skb, NULL, *(int *)param); 6490 case SEG6_LOCAL_ACTION_END_DT6: 6491 if (!seg6_bpf_has_valid_srh(skb)) 6492 return -EBADMSG; 6493 if (param_len != sizeof(int)) 6494 return -EINVAL; 6495 6496 if (ipv6_find_hdr(skb, &hdroff, IPPROTO_IPV6, NULL, NULL) < 0) 6497 return -EBADMSG; 6498 if (!pskb_pull(skb, hdroff)) 6499 return -EBADMSG; 6500 6501 skb_postpull_rcsum(skb, skb_network_header(skb), hdroff); 6502 skb_reset_network_header(skb); 6503 skb_reset_transport_header(skb); 6504 skb->encapsulation = 0; 6505 6506 bpf_compute_data_pointers(skb); 6507 bpf_update_srh_state(skb); 6508 return seg6_lookup_nexthop(skb, NULL, *(int *)param); 6509 case SEG6_LOCAL_ACTION_END_B6: 6510 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) 6511 return -EBADMSG; 6512 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6_INLINE, 6513 param, param_len); 6514 if (!err) 6515 bpf_update_srh_state(skb); 6516 6517 return err; 6518 case SEG6_LOCAL_ACTION_END_B6_ENCAP: 6519 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) 6520 return -EBADMSG; 6521 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6, 6522 param, param_len); 6523 if (!err) 6524 bpf_update_srh_state(skb); 6525 6526 return err; 6527 default: 6528 return -EINVAL; 6529 } 6530 } 6531 6532 static const struct bpf_func_proto bpf_lwt_seg6_action_proto = { 6533 .func = bpf_lwt_seg6_action, 6534 .gpl_only = false, 6535 .ret_type = RET_INTEGER, 6536 .arg1_type = ARG_PTR_TO_CTX, 6537 .arg2_type = ARG_ANYTHING, 6538 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6539 .arg4_type = ARG_CONST_SIZE 6540 }; 6541 6542 BPF_CALL_3(bpf_lwt_seg6_adjust_srh, struct sk_buff *, skb, u32, offset, 6543 s32, len) 6544 { 6545 struct seg6_bpf_srh_state *srh_state = 6546 this_cpu_ptr(&seg6_bpf_srh_states); 6547 struct ipv6_sr_hdr *srh = srh_state->srh; 6548 void *srh_end, *srh_tlvs, *ptr; 6549 struct ipv6hdr *hdr; 6550 int srhoff = 0; 6551 int ret; 6552 6553 if (unlikely(srh == NULL)) 6554 return -EINVAL; 6555 6556 srh_tlvs = (void *)((unsigned char *)srh + sizeof(*srh) + 6557 ((srh->first_segment + 1) << 4)); 6558 srh_end = (void *)((unsigned char *)srh + sizeof(*srh) + 6559 srh_state->hdrlen); 6560 ptr = skb->data + offset; 6561 6562 if (unlikely(ptr < srh_tlvs || ptr > srh_end)) 6563 return -EFAULT; 6564 if (unlikely(len < 0 && (void *)((char *)ptr - len) > srh_end)) 6565 return -EFAULT; 6566 6567 if (len > 0) { 6568 ret = skb_cow_head(skb, len); 6569 if (unlikely(ret < 0)) 6570 return ret; 6571 6572 ret = bpf_skb_net_hdr_push(skb, offset, len); 6573 } else { 6574 ret = bpf_skb_net_hdr_pop(skb, offset, -1 * len); 6575 } 6576 6577 bpf_compute_data_pointers(skb); 6578 if (unlikely(ret < 0)) 6579 return ret; 6580 6581 hdr = (struct ipv6hdr *)skb->data; 6582 hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); 6583 6584 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) 6585 return -EINVAL; 6586 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 6587 srh_state->hdrlen += len; 6588 srh_state->valid = false; 6589 return 0; 6590 } 6591 6592 static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = { 6593 .func = bpf_lwt_seg6_adjust_srh, 6594 .gpl_only = false, 6595 .ret_type = RET_INTEGER, 6596 .arg1_type = ARG_PTR_TO_CTX, 6597 .arg2_type = ARG_ANYTHING, 6598 .arg3_type = ARG_ANYTHING, 6599 }; 6600 #endif /* CONFIG_IPV6_SEG6_BPF */ 6601 6602 #ifdef CONFIG_INET 6603 static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple, 6604 int dif, int sdif, u8 family, u8 proto) 6605 { 6606 struct inet_hashinfo *hinfo = net->ipv4.tcp_death_row.hashinfo; 6607 bool refcounted = false; 6608 struct sock *sk = NULL; 6609 6610 if (family == AF_INET) { 6611 __be32 src4 = tuple->ipv4.saddr; 6612 __be32 dst4 = tuple->ipv4.daddr; 6613 6614 if (proto == IPPROTO_TCP) 6615 sk = __inet_lookup(net, hinfo, NULL, 0, 6616 src4, tuple->ipv4.sport, 6617 dst4, tuple->ipv4.dport, 6618 dif, sdif, &refcounted); 6619 else 6620 sk = __udp4_lib_lookup(net, src4, tuple->ipv4.sport, 6621 dst4, tuple->ipv4.dport, 6622 dif, sdif, net->ipv4.udp_table, NULL); 6623 #if IS_ENABLED(CONFIG_IPV6) 6624 } else { 6625 struct in6_addr *src6 = (struct in6_addr *)&tuple->ipv6.saddr; 6626 struct in6_addr *dst6 = (struct in6_addr *)&tuple->ipv6.daddr; 6627 6628 if (proto == IPPROTO_TCP) 6629 sk = __inet6_lookup(net, hinfo, NULL, 0, 6630 src6, tuple->ipv6.sport, 6631 dst6, ntohs(tuple->ipv6.dport), 6632 dif, sdif, &refcounted); 6633 else if (likely(ipv6_bpf_stub)) 6634 sk = ipv6_bpf_stub->udp6_lib_lookup(net, 6635 src6, tuple->ipv6.sport, 6636 dst6, tuple->ipv6.dport, 6637 dif, sdif, 6638 net->ipv4.udp_table, NULL); 6639 #endif 6640 } 6641 6642 if (unlikely(sk && !refcounted && !sock_flag(sk, SOCK_RCU_FREE))) { 6643 WARN_ONCE(1, "Found non-RCU, unreferenced socket!"); 6644 sk = NULL; 6645 } 6646 return sk; 6647 } 6648 6649 /* bpf_skc_lookup performs the core lookup for different types of sockets, 6650 * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE. 6651 */ 6652 static struct sock * 6653 __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6654 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, 6655 u64 flags, int sdif) 6656 { 6657 struct sock *sk = NULL; 6658 struct net *net; 6659 u8 family; 6660 6661 if (len == sizeof(tuple->ipv4)) 6662 family = AF_INET; 6663 else if (len == sizeof(tuple->ipv6)) 6664 family = AF_INET6; 6665 else 6666 return NULL; 6667 6668 if (unlikely(flags || !((s32)netns_id < 0 || netns_id <= S32_MAX))) 6669 goto out; 6670 6671 if (sdif < 0) { 6672 if (family == AF_INET) 6673 sdif = inet_sdif(skb); 6674 else 6675 sdif = inet6_sdif(skb); 6676 } 6677 6678 if ((s32)netns_id < 0) { 6679 net = caller_net; 6680 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); 6681 } else { 6682 net = get_net_ns_by_id(caller_net, netns_id); 6683 if (unlikely(!net)) 6684 goto out; 6685 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); 6686 put_net(net); 6687 } 6688 6689 out: 6690 return sk; 6691 } 6692 6693 static struct sock * 6694 __bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6695 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, 6696 u64 flags, int sdif) 6697 { 6698 struct sock *sk = __bpf_skc_lookup(skb, tuple, len, caller_net, 6699 ifindex, proto, netns_id, flags, 6700 sdif); 6701 6702 if (sk) { 6703 struct sock *sk2 = sk_to_full_sk(sk); 6704 6705 /* sk_to_full_sk() may return (sk)->rsk_listener, so make sure the original sk 6706 * sock refcnt is decremented to prevent a request_sock leak. 6707 */ 6708 if (!sk_fullsock(sk2)) 6709 sk2 = NULL; 6710 if (sk2 != sk) { 6711 sock_gen_put(sk); 6712 /* Ensure there is no need to bump sk2 refcnt */ 6713 if (unlikely(sk2 && !sock_flag(sk2, SOCK_RCU_FREE))) { 6714 WARN_ONCE(1, "Found non-RCU, unreferenced socket!"); 6715 return NULL; 6716 } 6717 sk = sk2; 6718 } 6719 } 6720 6721 return sk; 6722 } 6723 6724 static struct sock * 6725 bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6726 u8 proto, u64 netns_id, u64 flags) 6727 { 6728 struct net *caller_net; 6729 int ifindex; 6730 6731 if (skb->dev) { 6732 caller_net = dev_net(skb->dev); 6733 ifindex = skb->dev->ifindex; 6734 } else { 6735 caller_net = sock_net(skb->sk); 6736 ifindex = 0; 6737 } 6738 6739 return __bpf_skc_lookup(skb, tuple, len, caller_net, ifindex, proto, 6740 netns_id, flags, -1); 6741 } 6742 6743 static struct sock * 6744 bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6745 u8 proto, u64 netns_id, u64 flags) 6746 { 6747 struct sock *sk = bpf_skc_lookup(skb, tuple, len, proto, netns_id, 6748 flags); 6749 6750 if (sk) { 6751 struct sock *sk2 = sk_to_full_sk(sk); 6752 6753 /* sk_to_full_sk() may return (sk)->rsk_listener, so make sure the original sk 6754 * sock refcnt is decremented to prevent a request_sock leak. 6755 */ 6756 if (!sk_fullsock(sk2)) 6757 sk2 = NULL; 6758 if (sk2 != sk) { 6759 sock_gen_put(sk); 6760 /* Ensure there is no need to bump sk2 refcnt */ 6761 if (unlikely(sk2 && !sock_flag(sk2, SOCK_RCU_FREE))) { 6762 WARN_ONCE(1, "Found non-RCU, unreferenced socket!"); 6763 return NULL; 6764 } 6765 sk = sk2; 6766 } 6767 } 6768 6769 return sk; 6770 } 6771 6772 BPF_CALL_5(bpf_skc_lookup_tcp, struct sk_buff *, skb, 6773 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6774 { 6775 return (unsigned long)bpf_skc_lookup(skb, tuple, len, IPPROTO_TCP, 6776 netns_id, flags); 6777 } 6778 6779 static const struct bpf_func_proto bpf_skc_lookup_tcp_proto = { 6780 .func = bpf_skc_lookup_tcp, 6781 .gpl_only = false, 6782 .pkt_access = true, 6783 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 6784 .arg1_type = ARG_PTR_TO_CTX, 6785 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6786 .arg3_type = ARG_CONST_SIZE, 6787 .arg4_type = ARG_ANYTHING, 6788 .arg5_type = ARG_ANYTHING, 6789 }; 6790 6791 BPF_CALL_5(bpf_sk_lookup_tcp, struct sk_buff *, skb, 6792 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6793 { 6794 return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP, 6795 netns_id, flags); 6796 } 6797 6798 static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = { 6799 .func = bpf_sk_lookup_tcp, 6800 .gpl_only = false, 6801 .pkt_access = true, 6802 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6803 .arg1_type = ARG_PTR_TO_CTX, 6804 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6805 .arg3_type = ARG_CONST_SIZE, 6806 .arg4_type = ARG_ANYTHING, 6807 .arg5_type = ARG_ANYTHING, 6808 }; 6809 6810 BPF_CALL_5(bpf_sk_lookup_udp, struct sk_buff *, skb, 6811 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6812 { 6813 return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP, 6814 netns_id, flags); 6815 } 6816 6817 static const struct bpf_func_proto bpf_sk_lookup_udp_proto = { 6818 .func = bpf_sk_lookup_udp, 6819 .gpl_only = false, 6820 .pkt_access = true, 6821 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6822 .arg1_type = ARG_PTR_TO_CTX, 6823 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6824 .arg3_type = ARG_CONST_SIZE, 6825 .arg4_type = ARG_ANYTHING, 6826 .arg5_type = ARG_ANYTHING, 6827 }; 6828 6829 BPF_CALL_5(bpf_tc_skc_lookup_tcp, struct sk_buff *, skb, 6830 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6831 { 6832 struct net_device *dev = skb->dev; 6833 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6834 struct net *caller_net = dev_net(dev); 6835 6836 return (unsigned long)__bpf_skc_lookup(skb, tuple, len, caller_net, 6837 ifindex, IPPROTO_TCP, netns_id, 6838 flags, sdif); 6839 } 6840 6841 static const struct bpf_func_proto bpf_tc_skc_lookup_tcp_proto = { 6842 .func = bpf_tc_skc_lookup_tcp, 6843 .gpl_only = false, 6844 .pkt_access = true, 6845 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 6846 .arg1_type = ARG_PTR_TO_CTX, 6847 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6848 .arg3_type = ARG_CONST_SIZE, 6849 .arg4_type = ARG_ANYTHING, 6850 .arg5_type = ARG_ANYTHING, 6851 }; 6852 6853 BPF_CALL_5(bpf_tc_sk_lookup_tcp, struct sk_buff *, skb, 6854 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6855 { 6856 struct net_device *dev = skb->dev; 6857 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6858 struct net *caller_net = dev_net(dev); 6859 6860 return (unsigned long)__bpf_sk_lookup(skb, tuple, len, caller_net, 6861 ifindex, IPPROTO_TCP, netns_id, 6862 flags, sdif); 6863 } 6864 6865 static const struct bpf_func_proto bpf_tc_sk_lookup_tcp_proto = { 6866 .func = bpf_tc_sk_lookup_tcp, 6867 .gpl_only = false, 6868 .pkt_access = true, 6869 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6870 .arg1_type = ARG_PTR_TO_CTX, 6871 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6872 .arg3_type = ARG_CONST_SIZE, 6873 .arg4_type = ARG_ANYTHING, 6874 .arg5_type = ARG_ANYTHING, 6875 }; 6876 6877 BPF_CALL_5(bpf_tc_sk_lookup_udp, struct sk_buff *, skb, 6878 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6879 { 6880 struct net_device *dev = skb->dev; 6881 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6882 struct net *caller_net = dev_net(dev); 6883 6884 return (unsigned long)__bpf_sk_lookup(skb, tuple, len, caller_net, 6885 ifindex, IPPROTO_UDP, netns_id, 6886 flags, sdif); 6887 } 6888 6889 static const struct bpf_func_proto bpf_tc_sk_lookup_udp_proto = { 6890 .func = bpf_tc_sk_lookup_udp, 6891 .gpl_only = false, 6892 .pkt_access = true, 6893 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6894 .arg1_type = ARG_PTR_TO_CTX, 6895 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6896 .arg3_type = ARG_CONST_SIZE, 6897 .arg4_type = ARG_ANYTHING, 6898 .arg5_type = ARG_ANYTHING, 6899 }; 6900 6901 BPF_CALL_1(bpf_sk_release, struct sock *, sk) 6902 { 6903 if (sk && sk_is_refcounted(sk)) 6904 sock_gen_put(sk); 6905 return 0; 6906 } 6907 6908 static const struct bpf_func_proto bpf_sk_release_proto = { 6909 .func = bpf_sk_release, 6910 .gpl_only = false, 6911 .ret_type = RET_INTEGER, 6912 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON | OBJ_RELEASE, 6913 }; 6914 6915 BPF_CALL_5(bpf_xdp_sk_lookup_udp, struct xdp_buff *, ctx, 6916 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 6917 { 6918 struct net_device *dev = ctx->rxq->dev; 6919 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6920 struct net *caller_net = dev_net(dev); 6921 6922 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, 6923 ifindex, IPPROTO_UDP, netns_id, 6924 flags, sdif); 6925 } 6926 6927 static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = { 6928 .func = bpf_xdp_sk_lookup_udp, 6929 .gpl_only = false, 6930 .pkt_access = true, 6931 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6932 .arg1_type = ARG_PTR_TO_CTX, 6933 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6934 .arg3_type = ARG_CONST_SIZE, 6935 .arg4_type = ARG_ANYTHING, 6936 .arg5_type = ARG_ANYTHING, 6937 }; 6938 6939 BPF_CALL_5(bpf_xdp_skc_lookup_tcp, struct xdp_buff *, ctx, 6940 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 6941 { 6942 struct net_device *dev = ctx->rxq->dev; 6943 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6944 struct net *caller_net = dev_net(dev); 6945 6946 return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, caller_net, 6947 ifindex, IPPROTO_TCP, netns_id, 6948 flags, sdif); 6949 } 6950 6951 static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto = { 6952 .func = bpf_xdp_skc_lookup_tcp, 6953 .gpl_only = false, 6954 .pkt_access = true, 6955 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 6956 .arg1_type = ARG_PTR_TO_CTX, 6957 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6958 .arg3_type = ARG_CONST_SIZE, 6959 .arg4_type = ARG_ANYTHING, 6960 .arg5_type = ARG_ANYTHING, 6961 }; 6962 6963 BPF_CALL_5(bpf_xdp_sk_lookup_tcp, struct xdp_buff *, ctx, 6964 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 6965 { 6966 struct net_device *dev = ctx->rxq->dev; 6967 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6968 struct net *caller_net = dev_net(dev); 6969 6970 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, 6971 ifindex, IPPROTO_TCP, netns_id, 6972 flags, sdif); 6973 } 6974 6975 static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = { 6976 .func = bpf_xdp_sk_lookup_tcp, 6977 .gpl_only = false, 6978 .pkt_access = true, 6979 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6980 .arg1_type = ARG_PTR_TO_CTX, 6981 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6982 .arg3_type = ARG_CONST_SIZE, 6983 .arg4_type = ARG_ANYTHING, 6984 .arg5_type = ARG_ANYTHING, 6985 }; 6986 6987 BPF_CALL_5(bpf_sock_addr_skc_lookup_tcp, struct bpf_sock_addr_kern *, ctx, 6988 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6989 { 6990 return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, 6991 sock_net(ctx->sk), 0, 6992 IPPROTO_TCP, netns_id, flags, 6993 -1); 6994 } 6995 6996 static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto = { 6997 .func = bpf_sock_addr_skc_lookup_tcp, 6998 .gpl_only = false, 6999 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 7000 .arg1_type = ARG_PTR_TO_CTX, 7001 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7002 .arg3_type = ARG_CONST_SIZE, 7003 .arg4_type = ARG_ANYTHING, 7004 .arg5_type = ARG_ANYTHING, 7005 }; 7006 7007 BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp, struct bpf_sock_addr_kern *, ctx, 7008 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 7009 { 7010 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, 7011 sock_net(ctx->sk), 0, IPPROTO_TCP, 7012 netns_id, flags, -1); 7013 } 7014 7015 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = { 7016 .func = bpf_sock_addr_sk_lookup_tcp, 7017 .gpl_only = false, 7018 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 7019 .arg1_type = ARG_PTR_TO_CTX, 7020 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7021 .arg3_type = ARG_CONST_SIZE, 7022 .arg4_type = ARG_ANYTHING, 7023 .arg5_type = ARG_ANYTHING, 7024 }; 7025 7026 BPF_CALL_5(bpf_sock_addr_sk_lookup_udp, struct bpf_sock_addr_kern *, ctx, 7027 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 7028 { 7029 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, 7030 sock_net(ctx->sk), 0, IPPROTO_UDP, 7031 netns_id, flags, -1); 7032 } 7033 7034 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = { 7035 .func = bpf_sock_addr_sk_lookup_udp, 7036 .gpl_only = false, 7037 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 7038 .arg1_type = ARG_PTR_TO_CTX, 7039 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7040 .arg3_type = ARG_CONST_SIZE, 7041 .arg4_type = ARG_ANYTHING, 7042 .arg5_type = ARG_ANYTHING, 7043 }; 7044 7045 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 7046 struct bpf_insn_access_aux *info) 7047 { 7048 if (off < 0 || off >= offsetofend(struct bpf_tcp_sock, 7049 icsk_retransmits)) 7050 return false; 7051 7052 if (off % size != 0) 7053 return false; 7054 7055 switch (off) { 7056 case offsetof(struct bpf_tcp_sock, bytes_received): 7057 case offsetof(struct bpf_tcp_sock, bytes_acked): 7058 return size == sizeof(__u64); 7059 default: 7060 return size == sizeof(__u32); 7061 } 7062 } 7063 7064 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 7065 const struct bpf_insn *si, 7066 struct bpf_insn *insn_buf, 7067 struct bpf_prog *prog, u32 *target_size) 7068 { 7069 struct bpf_insn *insn = insn_buf; 7070 7071 #define BPF_TCP_SOCK_GET_COMMON(FIELD) \ 7072 do { \ 7073 BUILD_BUG_ON(sizeof_field(struct tcp_sock, FIELD) > \ 7074 sizeof_field(struct bpf_tcp_sock, FIELD)); \ 7075 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_sock, FIELD),\ 7076 si->dst_reg, si->src_reg, \ 7077 offsetof(struct tcp_sock, FIELD)); \ 7078 } while (0) 7079 7080 #define BPF_INET_SOCK_GET_COMMON(FIELD) \ 7081 do { \ 7082 BUILD_BUG_ON(sizeof_field(struct inet_connection_sock, \ 7083 FIELD) > \ 7084 sizeof_field(struct bpf_tcp_sock, FIELD)); \ 7085 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 7086 struct inet_connection_sock, \ 7087 FIELD), \ 7088 si->dst_reg, si->src_reg, \ 7089 offsetof( \ 7090 struct inet_connection_sock, \ 7091 FIELD)); \ 7092 } while (0) 7093 7094 BTF_TYPE_EMIT(struct bpf_tcp_sock); 7095 7096 switch (si->off) { 7097 case offsetof(struct bpf_tcp_sock, rtt_min): 7098 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) != 7099 sizeof(struct minmax)); 7100 BUILD_BUG_ON(sizeof(struct minmax) < 7101 sizeof(struct minmax_sample)); 7102 7103 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7104 offsetof(struct tcp_sock, rtt_min) + 7105 offsetof(struct minmax_sample, v)); 7106 break; 7107 case offsetof(struct bpf_tcp_sock, snd_cwnd): 7108 BPF_TCP_SOCK_GET_COMMON(snd_cwnd); 7109 break; 7110 case offsetof(struct bpf_tcp_sock, srtt_us): 7111 BPF_TCP_SOCK_GET_COMMON(srtt_us); 7112 break; 7113 case offsetof(struct bpf_tcp_sock, snd_ssthresh): 7114 BPF_TCP_SOCK_GET_COMMON(snd_ssthresh); 7115 break; 7116 case offsetof(struct bpf_tcp_sock, rcv_nxt): 7117 BPF_TCP_SOCK_GET_COMMON(rcv_nxt); 7118 break; 7119 case offsetof(struct bpf_tcp_sock, snd_nxt): 7120 BPF_TCP_SOCK_GET_COMMON(snd_nxt); 7121 break; 7122 case offsetof(struct bpf_tcp_sock, snd_una): 7123 BPF_TCP_SOCK_GET_COMMON(snd_una); 7124 break; 7125 case offsetof(struct bpf_tcp_sock, mss_cache): 7126 BPF_TCP_SOCK_GET_COMMON(mss_cache); 7127 break; 7128 case offsetof(struct bpf_tcp_sock, ecn_flags): 7129 BPF_TCP_SOCK_GET_COMMON(ecn_flags); 7130 break; 7131 case offsetof(struct bpf_tcp_sock, rate_delivered): 7132 BPF_TCP_SOCK_GET_COMMON(rate_delivered); 7133 break; 7134 case offsetof(struct bpf_tcp_sock, rate_interval_us): 7135 BPF_TCP_SOCK_GET_COMMON(rate_interval_us); 7136 break; 7137 case offsetof(struct bpf_tcp_sock, packets_out): 7138 BPF_TCP_SOCK_GET_COMMON(packets_out); 7139 break; 7140 case offsetof(struct bpf_tcp_sock, retrans_out): 7141 BPF_TCP_SOCK_GET_COMMON(retrans_out); 7142 break; 7143 case offsetof(struct bpf_tcp_sock, total_retrans): 7144 BPF_TCP_SOCK_GET_COMMON(total_retrans); 7145 break; 7146 case offsetof(struct bpf_tcp_sock, segs_in): 7147 BPF_TCP_SOCK_GET_COMMON(segs_in); 7148 break; 7149 case offsetof(struct bpf_tcp_sock, data_segs_in): 7150 BPF_TCP_SOCK_GET_COMMON(data_segs_in); 7151 break; 7152 case offsetof(struct bpf_tcp_sock, segs_out): 7153 BPF_TCP_SOCK_GET_COMMON(segs_out); 7154 break; 7155 case offsetof(struct bpf_tcp_sock, data_segs_out): 7156 BPF_TCP_SOCK_GET_COMMON(data_segs_out); 7157 break; 7158 case offsetof(struct bpf_tcp_sock, lost_out): 7159 BPF_TCP_SOCK_GET_COMMON(lost_out); 7160 break; 7161 case offsetof(struct bpf_tcp_sock, sacked_out): 7162 BPF_TCP_SOCK_GET_COMMON(sacked_out); 7163 break; 7164 case offsetof(struct bpf_tcp_sock, bytes_received): 7165 BPF_TCP_SOCK_GET_COMMON(bytes_received); 7166 break; 7167 case offsetof(struct bpf_tcp_sock, bytes_acked): 7168 BPF_TCP_SOCK_GET_COMMON(bytes_acked); 7169 break; 7170 case offsetof(struct bpf_tcp_sock, dsack_dups): 7171 BPF_TCP_SOCK_GET_COMMON(dsack_dups); 7172 break; 7173 case offsetof(struct bpf_tcp_sock, delivered): 7174 BPF_TCP_SOCK_GET_COMMON(delivered); 7175 break; 7176 case offsetof(struct bpf_tcp_sock, delivered_ce): 7177 BPF_TCP_SOCK_GET_COMMON(delivered_ce); 7178 break; 7179 case offsetof(struct bpf_tcp_sock, icsk_retransmits): 7180 BPF_INET_SOCK_GET_COMMON(icsk_retransmits); 7181 break; 7182 } 7183 7184 return insn - insn_buf; 7185 } 7186 7187 BPF_CALL_1(bpf_tcp_sock, struct sock *, sk) 7188 { 7189 if (sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP) 7190 return (unsigned long)sk; 7191 7192 return (unsigned long)NULL; 7193 } 7194 7195 const struct bpf_func_proto bpf_tcp_sock_proto = { 7196 .func = bpf_tcp_sock, 7197 .gpl_only = false, 7198 .ret_type = RET_PTR_TO_TCP_SOCK_OR_NULL, 7199 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 7200 }; 7201 7202 BPF_CALL_1(bpf_get_listener_sock, struct sock *, sk) 7203 { 7204 sk = sk_to_full_sk(sk); 7205 7206 if (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_RCU_FREE)) 7207 return (unsigned long)sk; 7208 7209 return (unsigned long)NULL; 7210 } 7211 7212 static const struct bpf_func_proto bpf_get_listener_sock_proto = { 7213 .func = bpf_get_listener_sock, 7214 .gpl_only = false, 7215 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 7216 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 7217 }; 7218 7219 BPF_CALL_1(bpf_skb_ecn_set_ce, struct sk_buff *, skb) 7220 { 7221 unsigned int iphdr_len; 7222 7223 switch (skb_protocol(skb, true)) { 7224 case cpu_to_be16(ETH_P_IP): 7225 iphdr_len = sizeof(struct iphdr); 7226 break; 7227 case cpu_to_be16(ETH_P_IPV6): 7228 iphdr_len = sizeof(struct ipv6hdr); 7229 break; 7230 default: 7231 return 0; 7232 } 7233 7234 if (skb_headlen(skb) < iphdr_len) 7235 return 0; 7236 7237 if (skb_cloned(skb) && !skb_clone_writable(skb, iphdr_len)) 7238 return 0; 7239 7240 return INET_ECN_set_ce(skb); 7241 } 7242 7243 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 7244 struct bpf_insn_access_aux *info) 7245 { 7246 if (off < 0 || off >= offsetofend(struct bpf_xdp_sock, queue_id)) 7247 return false; 7248 7249 if (off % size != 0) 7250 return false; 7251 7252 switch (off) { 7253 default: 7254 return size == sizeof(__u32); 7255 } 7256 } 7257 7258 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 7259 const struct bpf_insn *si, 7260 struct bpf_insn *insn_buf, 7261 struct bpf_prog *prog, u32 *target_size) 7262 { 7263 struct bpf_insn *insn = insn_buf; 7264 7265 #define BPF_XDP_SOCK_GET(FIELD) \ 7266 do { \ 7267 BUILD_BUG_ON(sizeof_field(struct xdp_sock, FIELD) > \ 7268 sizeof_field(struct bpf_xdp_sock, FIELD)); \ 7269 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_sock, FIELD),\ 7270 si->dst_reg, si->src_reg, \ 7271 offsetof(struct xdp_sock, FIELD)); \ 7272 } while (0) 7273 7274 switch (si->off) { 7275 case offsetof(struct bpf_xdp_sock, queue_id): 7276 BPF_XDP_SOCK_GET(queue_id); 7277 break; 7278 } 7279 7280 return insn - insn_buf; 7281 } 7282 7283 static const struct bpf_func_proto bpf_skb_ecn_set_ce_proto = { 7284 .func = bpf_skb_ecn_set_ce, 7285 .gpl_only = false, 7286 .ret_type = RET_INTEGER, 7287 .arg1_type = ARG_PTR_TO_CTX, 7288 }; 7289 7290 BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len, 7291 struct tcphdr *, th, u32, th_len) 7292 { 7293 #ifdef CONFIG_SYN_COOKIES 7294 int ret; 7295 7296 if (unlikely(!sk || th_len < sizeof(*th))) 7297 return -EINVAL; 7298 7299 /* sk_listener() allows TCP_NEW_SYN_RECV, which makes no sense here. */ 7300 if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN) 7301 return -EINVAL; 7302 7303 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_syncookies)) 7304 return -EINVAL; 7305 7306 if (!th->ack || th->rst || th->syn) 7307 return -ENOENT; 7308 7309 if (unlikely(iph_len < sizeof(struct iphdr))) 7310 return -EINVAL; 7311 7312 if (tcp_synq_no_recent_overflow(sk)) 7313 return -ENOENT; 7314 7315 /* Both struct iphdr and struct ipv6hdr have the version field at the 7316 * same offset so we can cast to the shorter header (struct iphdr). 7317 */ 7318 switch (((struct iphdr *)iph)->version) { 7319 case 4: 7320 if (sk->sk_family == AF_INET6 && ipv6_only_sock(sk)) 7321 return -EINVAL; 7322 7323 ret = __cookie_v4_check((struct iphdr *)iph, th); 7324 break; 7325 7326 #if IS_BUILTIN(CONFIG_IPV6) 7327 case 6: 7328 if (unlikely(iph_len < sizeof(struct ipv6hdr))) 7329 return -EINVAL; 7330 7331 if (sk->sk_family != AF_INET6) 7332 return -EINVAL; 7333 7334 ret = __cookie_v6_check((struct ipv6hdr *)iph, th); 7335 break; 7336 #endif /* CONFIG_IPV6 */ 7337 7338 default: 7339 return -EPROTONOSUPPORT; 7340 } 7341 7342 if (ret > 0) 7343 return 0; 7344 7345 return -ENOENT; 7346 #else 7347 return -ENOTSUPP; 7348 #endif 7349 } 7350 7351 static const struct bpf_func_proto bpf_tcp_check_syncookie_proto = { 7352 .func = bpf_tcp_check_syncookie, 7353 .gpl_only = true, 7354 .pkt_access = true, 7355 .ret_type = RET_INTEGER, 7356 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 7357 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7358 .arg3_type = ARG_CONST_SIZE, 7359 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7360 .arg5_type = ARG_CONST_SIZE, 7361 }; 7362 7363 BPF_CALL_5(bpf_tcp_gen_syncookie, struct sock *, sk, void *, iph, u32, iph_len, 7364 struct tcphdr *, th, u32, th_len) 7365 { 7366 #ifdef CONFIG_SYN_COOKIES 7367 u32 cookie; 7368 u16 mss; 7369 7370 if (unlikely(!sk || th_len < sizeof(*th) || th_len != th->doff * 4)) 7371 return -EINVAL; 7372 7373 if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN) 7374 return -EINVAL; 7375 7376 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_syncookies)) 7377 return -ENOENT; 7378 7379 if (!th->syn || th->ack || th->fin || th->rst) 7380 return -EINVAL; 7381 7382 if (unlikely(iph_len < sizeof(struct iphdr))) 7383 return -EINVAL; 7384 7385 /* Both struct iphdr and struct ipv6hdr have the version field at the 7386 * same offset so we can cast to the shorter header (struct iphdr). 7387 */ 7388 switch (((struct iphdr *)iph)->version) { 7389 case 4: 7390 if (sk->sk_family == AF_INET6 && ipv6_only_sock(sk)) 7391 return -EINVAL; 7392 7393 mss = tcp_v4_get_syncookie(sk, iph, th, &cookie); 7394 break; 7395 7396 #if IS_BUILTIN(CONFIG_IPV6) 7397 case 6: 7398 if (unlikely(iph_len < sizeof(struct ipv6hdr))) 7399 return -EINVAL; 7400 7401 if (sk->sk_family != AF_INET6) 7402 return -EINVAL; 7403 7404 mss = tcp_v6_get_syncookie(sk, iph, th, &cookie); 7405 break; 7406 #endif /* CONFIG_IPV6 */ 7407 7408 default: 7409 return -EPROTONOSUPPORT; 7410 } 7411 if (mss == 0) 7412 return -ENOENT; 7413 7414 return cookie | ((u64)mss << 32); 7415 #else 7416 return -EOPNOTSUPP; 7417 #endif /* CONFIG_SYN_COOKIES */ 7418 } 7419 7420 static const struct bpf_func_proto bpf_tcp_gen_syncookie_proto = { 7421 .func = bpf_tcp_gen_syncookie, 7422 .gpl_only = true, /* __cookie_v*_init_sequence() is GPL */ 7423 .pkt_access = true, 7424 .ret_type = RET_INTEGER, 7425 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 7426 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7427 .arg3_type = ARG_CONST_SIZE, 7428 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7429 .arg5_type = ARG_CONST_SIZE, 7430 }; 7431 7432 BPF_CALL_3(bpf_sk_assign, struct sk_buff *, skb, struct sock *, sk, u64, flags) 7433 { 7434 if (!sk || flags != 0) 7435 return -EINVAL; 7436 if (!skb_at_tc_ingress(skb)) 7437 return -EOPNOTSUPP; 7438 if (unlikely(dev_net(skb->dev) != sock_net(sk))) 7439 return -ENETUNREACH; 7440 if (sk_unhashed(sk)) 7441 return -EOPNOTSUPP; 7442 if (sk_is_refcounted(sk) && 7443 unlikely(!refcount_inc_not_zero(&sk->sk_refcnt))) 7444 return -ENOENT; 7445 7446 skb_orphan(skb); 7447 skb->sk = sk; 7448 skb->destructor = sock_pfree; 7449 7450 return 0; 7451 } 7452 7453 static const struct bpf_func_proto bpf_sk_assign_proto = { 7454 .func = bpf_sk_assign, 7455 .gpl_only = false, 7456 .ret_type = RET_INTEGER, 7457 .arg1_type = ARG_PTR_TO_CTX, 7458 .arg2_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 7459 .arg3_type = ARG_ANYTHING, 7460 }; 7461 7462 static const u8 *bpf_search_tcp_opt(const u8 *op, const u8 *opend, 7463 u8 search_kind, const u8 *magic, 7464 u8 magic_len, bool *eol) 7465 { 7466 u8 kind, kind_len; 7467 7468 *eol = false; 7469 7470 while (op < opend) { 7471 kind = op[0]; 7472 7473 if (kind == TCPOPT_EOL) { 7474 *eol = true; 7475 return ERR_PTR(-ENOMSG); 7476 } else if (kind == TCPOPT_NOP) { 7477 op++; 7478 continue; 7479 } 7480 7481 if (opend - op < 2 || opend - op < op[1] || op[1] < 2) 7482 /* Something is wrong in the received header. 7483 * Follow the TCP stack's tcp_parse_options() 7484 * and just bail here. 7485 */ 7486 return ERR_PTR(-EFAULT); 7487 7488 kind_len = op[1]; 7489 if (search_kind == kind) { 7490 if (!magic_len) 7491 return op; 7492 7493 if (magic_len > kind_len - 2) 7494 return ERR_PTR(-ENOMSG); 7495 7496 if (!memcmp(&op[2], magic, magic_len)) 7497 return op; 7498 } 7499 7500 op += kind_len; 7501 } 7502 7503 return ERR_PTR(-ENOMSG); 7504 } 7505 7506 BPF_CALL_4(bpf_sock_ops_load_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock, 7507 void *, search_res, u32, len, u64, flags) 7508 { 7509 bool eol, load_syn = flags & BPF_LOAD_HDR_OPT_TCP_SYN; 7510 const u8 *op, *opend, *magic, *search = search_res; 7511 u8 search_kind, search_len, copy_len, magic_len; 7512 int ret; 7513 7514 /* 2 byte is the minimal option len except TCPOPT_NOP and 7515 * TCPOPT_EOL which are useless for the bpf prog to learn 7516 * and this helper disallow loading them also. 7517 */ 7518 if (len < 2 || flags & ~BPF_LOAD_HDR_OPT_TCP_SYN) 7519 return -EINVAL; 7520 7521 search_kind = search[0]; 7522 search_len = search[1]; 7523 7524 if (search_len > len || search_kind == TCPOPT_NOP || 7525 search_kind == TCPOPT_EOL) 7526 return -EINVAL; 7527 7528 if (search_kind == TCPOPT_EXP || search_kind == 253) { 7529 /* 16 or 32 bit magic. +2 for kind and kind length */ 7530 if (search_len != 4 && search_len != 6) 7531 return -EINVAL; 7532 magic = &search[2]; 7533 magic_len = search_len - 2; 7534 } else { 7535 if (search_len) 7536 return -EINVAL; 7537 magic = NULL; 7538 magic_len = 0; 7539 } 7540 7541 if (load_syn) { 7542 ret = bpf_sock_ops_get_syn(bpf_sock, TCP_BPF_SYN, &op); 7543 if (ret < 0) 7544 return ret; 7545 7546 opend = op + ret; 7547 op += sizeof(struct tcphdr); 7548 } else { 7549 if (!bpf_sock->skb || 7550 bpf_sock->op == BPF_SOCK_OPS_HDR_OPT_LEN_CB) 7551 /* This bpf_sock->op cannot call this helper */ 7552 return -EPERM; 7553 7554 opend = bpf_sock->skb_data_end; 7555 op = bpf_sock->skb->data + sizeof(struct tcphdr); 7556 } 7557 7558 op = bpf_search_tcp_opt(op, opend, search_kind, magic, magic_len, 7559 &eol); 7560 if (IS_ERR(op)) 7561 return PTR_ERR(op); 7562 7563 copy_len = op[1]; 7564 ret = copy_len; 7565 if (copy_len > len) { 7566 ret = -ENOSPC; 7567 copy_len = len; 7568 } 7569 7570 memcpy(search_res, op, copy_len); 7571 return ret; 7572 } 7573 7574 static const struct bpf_func_proto bpf_sock_ops_load_hdr_opt_proto = { 7575 .func = bpf_sock_ops_load_hdr_opt, 7576 .gpl_only = false, 7577 .ret_type = RET_INTEGER, 7578 .arg1_type = ARG_PTR_TO_CTX, 7579 .arg2_type = ARG_PTR_TO_MEM, 7580 .arg3_type = ARG_CONST_SIZE, 7581 .arg4_type = ARG_ANYTHING, 7582 }; 7583 7584 BPF_CALL_4(bpf_sock_ops_store_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock, 7585 const void *, from, u32, len, u64, flags) 7586 { 7587 u8 new_kind, new_kind_len, magic_len = 0, *opend; 7588 const u8 *op, *new_op, *magic = NULL; 7589 struct sk_buff *skb; 7590 bool eol; 7591 7592 if (bpf_sock->op != BPF_SOCK_OPS_WRITE_HDR_OPT_CB) 7593 return -EPERM; 7594 7595 if (len < 2 || flags) 7596 return -EINVAL; 7597 7598 new_op = from; 7599 new_kind = new_op[0]; 7600 new_kind_len = new_op[1]; 7601 7602 if (new_kind_len > len || new_kind == TCPOPT_NOP || 7603 new_kind == TCPOPT_EOL) 7604 return -EINVAL; 7605 7606 if (new_kind_len > bpf_sock->remaining_opt_len) 7607 return -ENOSPC; 7608 7609 /* 253 is another experimental kind */ 7610 if (new_kind == TCPOPT_EXP || new_kind == 253) { 7611 if (new_kind_len < 4) 7612 return -EINVAL; 7613 /* Match for the 2 byte magic also. 7614 * RFC 6994: the magic could be 2 or 4 bytes. 7615 * Hence, matching by 2 byte only is on the 7616 * conservative side but it is the right 7617 * thing to do for the 'search-for-duplication' 7618 * purpose. 7619 */ 7620 magic = &new_op[2]; 7621 magic_len = 2; 7622 } 7623 7624 /* Check for duplication */ 7625 skb = bpf_sock->skb; 7626 op = skb->data + sizeof(struct tcphdr); 7627 opend = bpf_sock->skb_data_end; 7628 7629 op = bpf_search_tcp_opt(op, opend, new_kind, magic, magic_len, 7630 &eol); 7631 if (!IS_ERR(op)) 7632 return -EEXIST; 7633 7634 if (PTR_ERR(op) != -ENOMSG) 7635 return PTR_ERR(op); 7636 7637 if (eol) 7638 /* The option has been ended. Treat it as no more 7639 * header option can be written. 7640 */ 7641 return -ENOSPC; 7642 7643 /* No duplication found. Store the header option. */ 7644 memcpy(opend, from, new_kind_len); 7645 7646 bpf_sock->remaining_opt_len -= new_kind_len; 7647 bpf_sock->skb_data_end += new_kind_len; 7648 7649 return 0; 7650 } 7651 7652 static const struct bpf_func_proto bpf_sock_ops_store_hdr_opt_proto = { 7653 .func = bpf_sock_ops_store_hdr_opt, 7654 .gpl_only = false, 7655 .ret_type = RET_INTEGER, 7656 .arg1_type = ARG_PTR_TO_CTX, 7657 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7658 .arg3_type = ARG_CONST_SIZE, 7659 .arg4_type = ARG_ANYTHING, 7660 }; 7661 7662 BPF_CALL_3(bpf_sock_ops_reserve_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock, 7663 u32, len, u64, flags) 7664 { 7665 if (bpf_sock->op != BPF_SOCK_OPS_HDR_OPT_LEN_CB) 7666 return -EPERM; 7667 7668 if (flags || len < 2) 7669 return -EINVAL; 7670 7671 if (len > bpf_sock->remaining_opt_len) 7672 return -ENOSPC; 7673 7674 bpf_sock->remaining_opt_len -= len; 7675 7676 return 0; 7677 } 7678 7679 static const struct bpf_func_proto bpf_sock_ops_reserve_hdr_opt_proto = { 7680 .func = bpf_sock_ops_reserve_hdr_opt, 7681 .gpl_only = false, 7682 .ret_type = RET_INTEGER, 7683 .arg1_type = ARG_PTR_TO_CTX, 7684 .arg2_type = ARG_ANYTHING, 7685 .arg3_type = ARG_ANYTHING, 7686 }; 7687 7688 BPF_CALL_3(bpf_skb_set_tstamp, struct sk_buff *, skb, 7689 u64, tstamp, u32, tstamp_type) 7690 { 7691 /* skb_clear_delivery_time() is done for inet protocol */ 7692 if (skb->protocol != htons(ETH_P_IP) && 7693 skb->protocol != htons(ETH_P_IPV6)) 7694 return -EOPNOTSUPP; 7695 7696 switch (tstamp_type) { 7697 case BPF_SKB_TSTAMP_DELIVERY_MONO: 7698 if (!tstamp) 7699 return -EINVAL; 7700 skb->tstamp = tstamp; 7701 skb->mono_delivery_time = 1; 7702 break; 7703 case BPF_SKB_TSTAMP_UNSPEC: 7704 if (tstamp) 7705 return -EINVAL; 7706 skb->tstamp = 0; 7707 skb->mono_delivery_time = 0; 7708 break; 7709 default: 7710 return -EINVAL; 7711 } 7712 7713 return 0; 7714 } 7715 7716 static const struct bpf_func_proto bpf_skb_set_tstamp_proto = { 7717 .func = bpf_skb_set_tstamp, 7718 .gpl_only = false, 7719 .ret_type = RET_INTEGER, 7720 .arg1_type = ARG_PTR_TO_CTX, 7721 .arg2_type = ARG_ANYTHING, 7722 .arg3_type = ARG_ANYTHING, 7723 }; 7724 7725 #ifdef CONFIG_SYN_COOKIES 7726 BPF_CALL_3(bpf_tcp_raw_gen_syncookie_ipv4, struct iphdr *, iph, 7727 struct tcphdr *, th, u32, th_len) 7728 { 7729 u32 cookie; 7730 u16 mss; 7731 7732 if (unlikely(th_len < sizeof(*th) || th_len != th->doff * 4)) 7733 return -EINVAL; 7734 7735 mss = tcp_parse_mss_option(th, 0) ?: TCP_MSS_DEFAULT; 7736 cookie = __cookie_v4_init_sequence(iph, th, &mss); 7737 7738 return cookie | ((u64)mss << 32); 7739 } 7740 7741 static const struct bpf_func_proto bpf_tcp_raw_gen_syncookie_ipv4_proto = { 7742 .func = bpf_tcp_raw_gen_syncookie_ipv4, 7743 .gpl_only = true, /* __cookie_v4_init_sequence() is GPL */ 7744 .pkt_access = true, 7745 .ret_type = RET_INTEGER, 7746 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7747 .arg1_size = sizeof(struct iphdr), 7748 .arg2_type = ARG_PTR_TO_MEM, 7749 .arg3_type = ARG_CONST_SIZE_OR_ZERO, 7750 }; 7751 7752 BPF_CALL_3(bpf_tcp_raw_gen_syncookie_ipv6, struct ipv6hdr *, iph, 7753 struct tcphdr *, th, u32, th_len) 7754 { 7755 #if IS_BUILTIN(CONFIG_IPV6) 7756 const u16 mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - 7757 sizeof(struct ipv6hdr); 7758 u32 cookie; 7759 u16 mss; 7760 7761 if (unlikely(th_len < sizeof(*th) || th_len != th->doff * 4)) 7762 return -EINVAL; 7763 7764 mss = tcp_parse_mss_option(th, 0) ?: mss_clamp; 7765 cookie = __cookie_v6_init_sequence(iph, th, &mss); 7766 7767 return cookie | ((u64)mss << 32); 7768 #else 7769 return -EPROTONOSUPPORT; 7770 #endif 7771 } 7772 7773 static const struct bpf_func_proto bpf_tcp_raw_gen_syncookie_ipv6_proto = { 7774 .func = bpf_tcp_raw_gen_syncookie_ipv6, 7775 .gpl_only = true, /* __cookie_v6_init_sequence() is GPL */ 7776 .pkt_access = true, 7777 .ret_type = RET_INTEGER, 7778 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7779 .arg1_size = sizeof(struct ipv6hdr), 7780 .arg2_type = ARG_PTR_TO_MEM, 7781 .arg3_type = ARG_CONST_SIZE_OR_ZERO, 7782 }; 7783 7784 BPF_CALL_2(bpf_tcp_raw_check_syncookie_ipv4, struct iphdr *, iph, 7785 struct tcphdr *, th) 7786 { 7787 if (__cookie_v4_check(iph, th) > 0) 7788 return 0; 7789 7790 return -EACCES; 7791 } 7792 7793 static const struct bpf_func_proto bpf_tcp_raw_check_syncookie_ipv4_proto = { 7794 .func = bpf_tcp_raw_check_syncookie_ipv4, 7795 .gpl_only = true, /* __cookie_v4_check is GPL */ 7796 .pkt_access = true, 7797 .ret_type = RET_INTEGER, 7798 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7799 .arg1_size = sizeof(struct iphdr), 7800 .arg2_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7801 .arg2_size = sizeof(struct tcphdr), 7802 }; 7803 7804 BPF_CALL_2(bpf_tcp_raw_check_syncookie_ipv6, struct ipv6hdr *, iph, 7805 struct tcphdr *, th) 7806 { 7807 #if IS_BUILTIN(CONFIG_IPV6) 7808 if (__cookie_v6_check(iph, th) > 0) 7809 return 0; 7810 7811 return -EACCES; 7812 #else 7813 return -EPROTONOSUPPORT; 7814 #endif 7815 } 7816 7817 static const struct bpf_func_proto bpf_tcp_raw_check_syncookie_ipv6_proto = { 7818 .func = bpf_tcp_raw_check_syncookie_ipv6, 7819 .gpl_only = true, /* __cookie_v6_check is GPL */ 7820 .pkt_access = true, 7821 .ret_type = RET_INTEGER, 7822 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7823 .arg1_size = sizeof(struct ipv6hdr), 7824 .arg2_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7825 .arg2_size = sizeof(struct tcphdr), 7826 }; 7827 #endif /* CONFIG_SYN_COOKIES */ 7828 7829 #endif /* CONFIG_INET */ 7830 7831 bool bpf_helper_changes_pkt_data(void *func) 7832 { 7833 if (func == bpf_skb_vlan_push || 7834 func == bpf_skb_vlan_pop || 7835 func == bpf_skb_store_bytes || 7836 func == bpf_skb_change_proto || 7837 func == bpf_skb_change_head || 7838 func == sk_skb_change_head || 7839 func == bpf_skb_change_tail || 7840 func == sk_skb_change_tail || 7841 func == bpf_skb_adjust_room || 7842 func == sk_skb_adjust_room || 7843 func == bpf_skb_pull_data || 7844 func == sk_skb_pull_data || 7845 func == bpf_clone_redirect || 7846 func == bpf_l3_csum_replace || 7847 func == bpf_l4_csum_replace || 7848 func == bpf_xdp_adjust_head || 7849 func == bpf_xdp_adjust_meta || 7850 func == bpf_msg_pull_data || 7851 func == bpf_msg_push_data || 7852 func == bpf_msg_pop_data || 7853 func == bpf_xdp_adjust_tail || 7854 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 7855 func == bpf_lwt_seg6_store_bytes || 7856 func == bpf_lwt_seg6_adjust_srh || 7857 func == bpf_lwt_seg6_action || 7858 #endif 7859 #ifdef CONFIG_INET 7860 func == bpf_sock_ops_store_hdr_opt || 7861 #endif 7862 func == bpf_lwt_in_push_encap || 7863 func == bpf_lwt_xmit_push_encap) 7864 return true; 7865 7866 return false; 7867 } 7868 7869 const struct bpf_func_proto bpf_event_output_data_proto __weak; 7870 const struct bpf_func_proto bpf_sk_storage_get_cg_sock_proto __weak; 7871 7872 static const struct bpf_func_proto * 7873 sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7874 { 7875 const struct bpf_func_proto *func_proto; 7876 7877 func_proto = cgroup_common_func_proto(func_id, prog); 7878 if (func_proto) 7879 return func_proto; 7880 7881 func_proto = cgroup_current_func_proto(func_id, prog); 7882 if (func_proto) 7883 return func_proto; 7884 7885 switch (func_id) { 7886 case BPF_FUNC_get_socket_cookie: 7887 return &bpf_get_socket_cookie_sock_proto; 7888 case BPF_FUNC_get_netns_cookie: 7889 return &bpf_get_netns_cookie_sock_proto; 7890 case BPF_FUNC_perf_event_output: 7891 return &bpf_event_output_data_proto; 7892 case BPF_FUNC_sk_storage_get: 7893 return &bpf_sk_storage_get_cg_sock_proto; 7894 case BPF_FUNC_ktime_get_coarse_ns: 7895 return &bpf_ktime_get_coarse_ns_proto; 7896 default: 7897 return bpf_base_func_proto(func_id); 7898 } 7899 } 7900 7901 static const struct bpf_func_proto * 7902 sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7903 { 7904 const struct bpf_func_proto *func_proto; 7905 7906 func_proto = cgroup_common_func_proto(func_id, prog); 7907 if (func_proto) 7908 return func_proto; 7909 7910 func_proto = cgroup_current_func_proto(func_id, prog); 7911 if (func_proto) 7912 return func_proto; 7913 7914 switch (func_id) { 7915 case BPF_FUNC_bind: 7916 switch (prog->expected_attach_type) { 7917 case BPF_CGROUP_INET4_CONNECT: 7918 case BPF_CGROUP_INET6_CONNECT: 7919 return &bpf_bind_proto; 7920 default: 7921 return NULL; 7922 } 7923 case BPF_FUNC_get_socket_cookie: 7924 return &bpf_get_socket_cookie_sock_addr_proto; 7925 case BPF_FUNC_get_netns_cookie: 7926 return &bpf_get_netns_cookie_sock_addr_proto; 7927 case BPF_FUNC_perf_event_output: 7928 return &bpf_event_output_data_proto; 7929 #ifdef CONFIG_INET 7930 case BPF_FUNC_sk_lookup_tcp: 7931 return &bpf_sock_addr_sk_lookup_tcp_proto; 7932 case BPF_FUNC_sk_lookup_udp: 7933 return &bpf_sock_addr_sk_lookup_udp_proto; 7934 case BPF_FUNC_sk_release: 7935 return &bpf_sk_release_proto; 7936 case BPF_FUNC_skc_lookup_tcp: 7937 return &bpf_sock_addr_skc_lookup_tcp_proto; 7938 #endif /* CONFIG_INET */ 7939 case BPF_FUNC_sk_storage_get: 7940 return &bpf_sk_storage_get_proto; 7941 case BPF_FUNC_sk_storage_delete: 7942 return &bpf_sk_storage_delete_proto; 7943 case BPF_FUNC_setsockopt: 7944 switch (prog->expected_attach_type) { 7945 case BPF_CGROUP_INET4_BIND: 7946 case BPF_CGROUP_INET6_BIND: 7947 case BPF_CGROUP_INET4_CONNECT: 7948 case BPF_CGROUP_INET6_CONNECT: 7949 case BPF_CGROUP_UNIX_CONNECT: 7950 case BPF_CGROUP_UDP4_RECVMSG: 7951 case BPF_CGROUP_UDP6_RECVMSG: 7952 case BPF_CGROUP_UNIX_RECVMSG: 7953 case BPF_CGROUP_UDP4_SENDMSG: 7954 case BPF_CGROUP_UDP6_SENDMSG: 7955 case BPF_CGROUP_UNIX_SENDMSG: 7956 case BPF_CGROUP_INET4_GETPEERNAME: 7957 case BPF_CGROUP_INET6_GETPEERNAME: 7958 case BPF_CGROUP_UNIX_GETPEERNAME: 7959 case BPF_CGROUP_INET4_GETSOCKNAME: 7960 case BPF_CGROUP_INET6_GETSOCKNAME: 7961 case BPF_CGROUP_UNIX_GETSOCKNAME: 7962 return &bpf_sock_addr_setsockopt_proto; 7963 default: 7964 return NULL; 7965 } 7966 case BPF_FUNC_getsockopt: 7967 switch (prog->expected_attach_type) { 7968 case BPF_CGROUP_INET4_BIND: 7969 case BPF_CGROUP_INET6_BIND: 7970 case BPF_CGROUP_INET4_CONNECT: 7971 case BPF_CGROUP_INET6_CONNECT: 7972 case BPF_CGROUP_UNIX_CONNECT: 7973 case BPF_CGROUP_UDP4_RECVMSG: 7974 case BPF_CGROUP_UDP6_RECVMSG: 7975 case BPF_CGROUP_UNIX_RECVMSG: 7976 case BPF_CGROUP_UDP4_SENDMSG: 7977 case BPF_CGROUP_UDP6_SENDMSG: 7978 case BPF_CGROUP_UNIX_SENDMSG: 7979 case BPF_CGROUP_INET4_GETPEERNAME: 7980 case BPF_CGROUP_INET6_GETPEERNAME: 7981 case BPF_CGROUP_UNIX_GETPEERNAME: 7982 case BPF_CGROUP_INET4_GETSOCKNAME: 7983 case BPF_CGROUP_INET6_GETSOCKNAME: 7984 case BPF_CGROUP_UNIX_GETSOCKNAME: 7985 return &bpf_sock_addr_getsockopt_proto; 7986 default: 7987 return NULL; 7988 } 7989 default: 7990 return bpf_sk_base_func_proto(func_id); 7991 } 7992 } 7993 7994 static const struct bpf_func_proto * 7995 sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7996 { 7997 switch (func_id) { 7998 case BPF_FUNC_skb_load_bytes: 7999 return &bpf_skb_load_bytes_proto; 8000 case BPF_FUNC_skb_load_bytes_relative: 8001 return &bpf_skb_load_bytes_relative_proto; 8002 case BPF_FUNC_get_socket_cookie: 8003 return &bpf_get_socket_cookie_proto; 8004 case BPF_FUNC_get_socket_uid: 8005 return &bpf_get_socket_uid_proto; 8006 case BPF_FUNC_perf_event_output: 8007 return &bpf_skb_event_output_proto; 8008 default: 8009 return bpf_sk_base_func_proto(func_id); 8010 } 8011 } 8012 8013 const struct bpf_func_proto bpf_sk_storage_get_proto __weak; 8014 const struct bpf_func_proto bpf_sk_storage_delete_proto __weak; 8015 8016 static const struct bpf_func_proto * 8017 cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8018 { 8019 const struct bpf_func_proto *func_proto; 8020 8021 func_proto = cgroup_common_func_proto(func_id, prog); 8022 if (func_proto) 8023 return func_proto; 8024 8025 switch (func_id) { 8026 case BPF_FUNC_sk_fullsock: 8027 return &bpf_sk_fullsock_proto; 8028 case BPF_FUNC_sk_storage_get: 8029 return &bpf_sk_storage_get_proto; 8030 case BPF_FUNC_sk_storage_delete: 8031 return &bpf_sk_storage_delete_proto; 8032 case BPF_FUNC_perf_event_output: 8033 return &bpf_skb_event_output_proto; 8034 #ifdef CONFIG_SOCK_CGROUP_DATA 8035 case BPF_FUNC_skb_cgroup_id: 8036 return &bpf_skb_cgroup_id_proto; 8037 case BPF_FUNC_skb_ancestor_cgroup_id: 8038 return &bpf_skb_ancestor_cgroup_id_proto; 8039 case BPF_FUNC_sk_cgroup_id: 8040 return &bpf_sk_cgroup_id_proto; 8041 case BPF_FUNC_sk_ancestor_cgroup_id: 8042 return &bpf_sk_ancestor_cgroup_id_proto; 8043 #endif 8044 #ifdef CONFIG_INET 8045 case BPF_FUNC_sk_lookup_tcp: 8046 return &bpf_sk_lookup_tcp_proto; 8047 case BPF_FUNC_sk_lookup_udp: 8048 return &bpf_sk_lookup_udp_proto; 8049 case BPF_FUNC_sk_release: 8050 return &bpf_sk_release_proto; 8051 case BPF_FUNC_skc_lookup_tcp: 8052 return &bpf_skc_lookup_tcp_proto; 8053 case BPF_FUNC_tcp_sock: 8054 return &bpf_tcp_sock_proto; 8055 case BPF_FUNC_get_listener_sock: 8056 return &bpf_get_listener_sock_proto; 8057 case BPF_FUNC_skb_ecn_set_ce: 8058 return &bpf_skb_ecn_set_ce_proto; 8059 #endif 8060 default: 8061 return sk_filter_func_proto(func_id, prog); 8062 } 8063 } 8064 8065 static const struct bpf_func_proto * 8066 tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8067 { 8068 switch (func_id) { 8069 case BPF_FUNC_skb_store_bytes: 8070 return &bpf_skb_store_bytes_proto; 8071 case BPF_FUNC_skb_load_bytes: 8072 return &bpf_skb_load_bytes_proto; 8073 case BPF_FUNC_skb_load_bytes_relative: 8074 return &bpf_skb_load_bytes_relative_proto; 8075 case BPF_FUNC_skb_pull_data: 8076 return &bpf_skb_pull_data_proto; 8077 case BPF_FUNC_csum_diff: 8078 return &bpf_csum_diff_proto; 8079 case BPF_FUNC_csum_update: 8080 return &bpf_csum_update_proto; 8081 case BPF_FUNC_csum_level: 8082 return &bpf_csum_level_proto; 8083 case BPF_FUNC_l3_csum_replace: 8084 return &bpf_l3_csum_replace_proto; 8085 case BPF_FUNC_l4_csum_replace: 8086 return &bpf_l4_csum_replace_proto; 8087 case BPF_FUNC_clone_redirect: 8088 return &bpf_clone_redirect_proto; 8089 case BPF_FUNC_get_cgroup_classid: 8090 return &bpf_get_cgroup_classid_proto; 8091 case BPF_FUNC_skb_vlan_push: 8092 return &bpf_skb_vlan_push_proto; 8093 case BPF_FUNC_skb_vlan_pop: 8094 return &bpf_skb_vlan_pop_proto; 8095 case BPF_FUNC_skb_change_proto: 8096 return &bpf_skb_change_proto_proto; 8097 case BPF_FUNC_skb_change_type: 8098 return &bpf_skb_change_type_proto; 8099 case BPF_FUNC_skb_adjust_room: 8100 return &bpf_skb_adjust_room_proto; 8101 case BPF_FUNC_skb_change_tail: 8102 return &bpf_skb_change_tail_proto; 8103 case BPF_FUNC_skb_change_head: 8104 return &bpf_skb_change_head_proto; 8105 case BPF_FUNC_skb_get_tunnel_key: 8106 return &bpf_skb_get_tunnel_key_proto; 8107 case BPF_FUNC_skb_set_tunnel_key: 8108 return bpf_get_skb_set_tunnel_proto(func_id); 8109 case BPF_FUNC_skb_get_tunnel_opt: 8110 return &bpf_skb_get_tunnel_opt_proto; 8111 case BPF_FUNC_skb_set_tunnel_opt: 8112 return bpf_get_skb_set_tunnel_proto(func_id); 8113 case BPF_FUNC_redirect: 8114 return &bpf_redirect_proto; 8115 case BPF_FUNC_redirect_neigh: 8116 return &bpf_redirect_neigh_proto; 8117 case BPF_FUNC_redirect_peer: 8118 return &bpf_redirect_peer_proto; 8119 case BPF_FUNC_get_route_realm: 8120 return &bpf_get_route_realm_proto; 8121 case BPF_FUNC_get_hash_recalc: 8122 return &bpf_get_hash_recalc_proto; 8123 case BPF_FUNC_set_hash_invalid: 8124 return &bpf_set_hash_invalid_proto; 8125 case BPF_FUNC_set_hash: 8126 return &bpf_set_hash_proto; 8127 case BPF_FUNC_perf_event_output: 8128 return &bpf_skb_event_output_proto; 8129 case BPF_FUNC_get_smp_processor_id: 8130 return &bpf_get_smp_processor_id_proto; 8131 case BPF_FUNC_skb_under_cgroup: 8132 return &bpf_skb_under_cgroup_proto; 8133 case BPF_FUNC_get_socket_cookie: 8134 return &bpf_get_socket_cookie_proto; 8135 case BPF_FUNC_get_socket_uid: 8136 return &bpf_get_socket_uid_proto; 8137 case BPF_FUNC_fib_lookup: 8138 return &bpf_skb_fib_lookup_proto; 8139 case BPF_FUNC_check_mtu: 8140 return &bpf_skb_check_mtu_proto; 8141 case BPF_FUNC_sk_fullsock: 8142 return &bpf_sk_fullsock_proto; 8143 case BPF_FUNC_sk_storage_get: 8144 return &bpf_sk_storage_get_proto; 8145 case BPF_FUNC_sk_storage_delete: 8146 return &bpf_sk_storage_delete_proto; 8147 #ifdef CONFIG_XFRM 8148 case BPF_FUNC_skb_get_xfrm_state: 8149 return &bpf_skb_get_xfrm_state_proto; 8150 #endif 8151 #ifdef CONFIG_CGROUP_NET_CLASSID 8152 case BPF_FUNC_skb_cgroup_classid: 8153 return &bpf_skb_cgroup_classid_proto; 8154 #endif 8155 #ifdef CONFIG_SOCK_CGROUP_DATA 8156 case BPF_FUNC_skb_cgroup_id: 8157 return &bpf_skb_cgroup_id_proto; 8158 case BPF_FUNC_skb_ancestor_cgroup_id: 8159 return &bpf_skb_ancestor_cgroup_id_proto; 8160 #endif 8161 #ifdef CONFIG_INET 8162 case BPF_FUNC_sk_lookup_tcp: 8163 return &bpf_tc_sk_lookup_tcp_proto; 8164 case BPF_FUNC_sk_lookup_udp: 8165 return &bpf_tc_sk_lookup_udp_proto; 8166 case BPF_FUNC_sk_release: 8167 return &bpf_sk_release_proto; 8168 case BPF_FUNC_tcp_sock: 8169 return &bpf_tcp_sock_proto; 8170 case BPF_FUNC_get_listener_sock: 8171 return &bpf_get_listener_sock_proto; 8172 case BPF_FUNC_skc_lookup_tcp: 8173 return &bpf_tc_skc_lookup_tcp_proto; 8174 case BPF_FUNC_tcp_check_syncookie: 8175 return &bpf_tcp_check_syncookie_proto; 8176 case BPF_FUNC_skb_ecn_set_ce: 8177 return &bpf_skb_ecn_set_ce_proto; 8178 case BPF_FUNC_tcp_gen_syncookie: 8179 return &bpf_tcp_gen_syncookie_proto; 8180 case BPF_FUNC_sk_assign: 8181 return &bpf_sk_assign_proto; 8182 case BPF_FUNC_skb_set_tstamp: 8183 return &bpf_skb_set_tstamp_proto; 8184 #ifdef CONFIG_SYN_COOKIES 8185 case BPF_FUNC_tcp_raw_gen_syncookie_ipv4: 8186 return &bpf_tcp_raw_gen_syncookie_ipv4_proto; 8187 case BPF_FUNC_tcp_raw_gen_syncookie_ipv6: 8188 return &bpf_tcp_raw_gen_syncookie_ipv6_proto; 8189 case BPF_FUNC_tcp_raw_check_syncookie_ipv4: 8190 return &bpf_tcp_raw_check_syncookie_ipv4_proto; 8191 case BPF_FUNC_tcp_raw_check_syncookie_ipv6: 8192 return &bpf_tcp_raw_check_syncookie_ipv6_proto; 8193 #endif 8194 #endif 8195 default: 8196 return bpf_sk_base_func_proto(func_id); 8197 } 8198 } 8199 8200 static const struct bpf_func_proto * 8201 xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8202 { 8203 switch (func_id) { 8204 case BPF_FUNC_perf_event_output: 8205 return &bpf_xdp_event_output_proto; 8206 case BPF_FUNC_get_smp_processor_id: 8207 return &bpf_get_smp_processor_id_proto; 8208 case BPF_FUNC_csum_diff: 8209 return &bpf_csum_diff_proto; 8210 case BPF_FUNC_xdp_adjust_head: 8211 return &bpf_xdp_adjust_head_proto; 8212 case BPF_FUNC_xdp_adjust_meta: 8213 return &bpf_xdp_adjust_meta_proto; 8214 case BPF_FUNC_redirect: 8215 return &bpf_xdp_redirect_proto; 8216 case BPF_FUNC_redirect_map: 8217 return &bpf_xdp_redirect_map_proto; 8218 case BPF_FUNC_xdp_adjust_tail: 8219 return &bpf_xdp_adjust_tail_proto; 8220 case BPF_FUNC_xdp_get_buff_len: 8221 return &bpf_xdp_get_buff_len_proto; 8222 case BPF_FUNC_xdp_load_bytes: 8223 return &bpf_xdp_load_bytes_proto; 8224 case BPF_FUNC_xdp_store_bytes: 8225 return &bpf_xdp_store_bytes_proto; 8226 case BPF_FUNC_fib_lookup: 8227 return &bpf_xdp_fib_lookup_proto; 8228 case BPF_FUNC_check_mtu: 8229 return &bpf_xdp_check_mtu_proto; 8230 #ifdef CONFIG_INET 8231 case BPF_FUNC_sk_lookup_udp: 8232 return &bpf_xdp_sk_lookup_udp_proto; 8233 case BPF_FUNC_sk_lookup_tcp: 8234 return &bpf_xdp_sk_lookup_tcp_proto; 8235 case BPF_FUNC_sk_release: 8236 return &bpf_sk_release_proto; 8237 case BPF_FUNC_skc_lookup_tcp: 8238 return &bpf_xdp_skc_lookup_tcp_proto; 8239 case BPF_FUNC_tcp_check_syncookie: 8240 return &bpf_tcp_check_syncookie_proto; 8241 case BPF_FUNC_tcp_gen_syncookie: 8242 return &bpf_tcp_gen_syncookie_proto; 8243 #ifdef CONFIG_SYN_COOKIES 8244 case BPF_FUNC_tcp_raw_gen_syncookie_ipv4: 8245 return &bpf_tcp_raw_gen_syncookie_ipv4_proto; 8246 case BPF_FUNC_tcp_raw_gen_syncookie_ipv6: 8247 return &bpf_tcp_raw_gen_syncookie_ipv6_proto; 8248 case BPF_FUNC_tcp_raw_check_syncookie_ipv4: 8249 return &bpf_tcp_raw_check_syncookie_ipv4_proto; 8250 case BPF_FUNC_tcp_raw_check_syncookie_ipv6: 8251 return &bpf_tcp_raw_check_syncookie_ipv6_proto; 8252 #endif 8253 #endif 8254 default: 8255 return bpf_sk_base_func_proto(func_id); 8256 } 8257 8258 #if IS_MODULE(CONFIG_NF_CONNTRACK) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES) 8259 /* The nf_conn___init type is used in the NF_CONNTRACK kfuncs. The 8260 * kfuncs are defined in two different modules, and we want to be able 8261 * to use them interchangably with the same BTF type ID. Because modules 8262 * can't de-duplicate BTF IDs between each other, we need the type to be 8263 * referenced in the vmlinux BTF or the verifier will get confused about 8264 * the different types. So we add this dummy type reference which will 8265 * be included in vmlinux BTF, allowing both modules to refer to the 8266 * same type ID. 8267 */ 8268 BTF_TYPE_EMIT(struct nf_conn___init); 8269 #endif 8270 } 8271 8272 const struct bpf_func_proto bpf_sock_map_update_proto __weak; 8273 const struct bpf_func_proto bpf_sock_hash_update_proto __weak; 8274 8275 static const struct bpf_func_proto * 8276 sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8277 { 8278 const struct bpf_func_proto *func_proto; 8279 8280 func_proto = cgroup_common_func_proto(func_id, prog); 8281 if (func_proto) 8282 return func_proto; 8283 8284 switch (func_id) { 8285 case BPF_FUNC_setsockopt: 8286 return &bpf_sock_ops_setsockopt_proto; 8287 case BPF_FUNC_getsockopt: 8288 return &bpf_sock_ops_getsockopt_proto; 8289 case BPF_FUNC_sock_ops_cb_flags_set: 8290 return &bpf_sock_ops_cb_flags_set_proto; 8291 case BPF_FUNC_sock_map_update: 8292 return &bpf_sock_map_update_proto; 8293 case BPF_FUNC_sock_hash_update: 8294 return &bpf_sock_hash_update_proto; 8295 case BPF_FUNC_get_socket_cookie: 8296 return &bpf_get_socket_cookie_sock_ops_proto; 8297 case BPF_FUNC_perf_event_output: 8298 return &bpf_event_output_data_proto; 8299 case BPF_FUNC_sk_storage_get: 8300 return &bpf_sk_storage_get_proto; 8301 case BPF_FUNC_sk_storage_delete: 8302 return &bpf_sk_storage_delete_proto; 8303 case BPF_FUNC_get_netns_cookie: 8304 return &bpf_get_netns_cookie_sock_ops_proto; 8305 #ifdef CONFIG_INET 8306 case BPF_FUNC_load_hdr_opt: 8307 return &bpf_sock_ops_load_hdr_opt_proto; 8308 case BPF_FUNC_store_hdr_opt: 8309 return &bpf_sock_ops_store_hdr_opt_proto; 8310 case BPF_FUNC_reserve_hdr_opt: 8311 return &bpf_sock_ops_reserve_hdr_opt_proto; 8312 case BPF_FUNC_tcp_sock: 8313 return &bpf_tcp_sock_proto; 8314 #endif /* CONFIG_INET */ 8315 default: 8316 return bpf_sk_base_func_proto(func_id); 8317 } 8318 } 8319 8320 const struct bpf_func_proto bpf_msg_redirect_map_proto __weak; 8321 const struct bpf_func_proto bpf_msg_redirect_hash_proto __weak; 8322 8323 static const struct bpf_func_proto * 8324 sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8325 { 8326 switch (func_id) { 8327 case BPF_FUNC_msg_redirect_map: 8328 return &bpf_msg_redirect_map_proto; 8329 case BPF_FUNC_msg_redirect_hash: 8330 return &bpf_msg_redirect_hash_proto; 8331 case BPF_FUNC_msg_apply_bytes: 8332 return &bpf_msg_apply_bytes_proto; 8333 case BPF_FUNC_msg_cork_bytes: 8334 return &bpf_msg_cork_bytes_proto; 8335 case BPF_FUNC_msg_pull_data: 8336 return &bpf_msg_pull_data_proto; 8337 case BPF_FUNC_msg_push_data: 8338 return &bpf_msg_push_data_proto; 8339 case BPF_FUNC_msg_pop_data: 8340 return &bpf_msg_pop_data_proto; 8341 case BPF_FUNC_perf_event_output: 8342 return &bpf_event_output_data_proto; 8343 case BPF_FUNC_get_current_uid_gid: 8344 return &bpf_get_current_uid_gid_proto; 8345 case BPF_FUNC_get_current_pid_tgid: 8346 return &bpf_get_current_pid_tgid_proto; 8347 case BPF_FUNC_sk_storage_get: 8348 return &bpf_sk_storage_get_proto; 8349 case BPF_FUNC_sk_storage_delete: 8350 return &bpf_sk_storage_delete_proto; 8351 case BPF_FUNC_get_netns_cookie: 8352 return &bpf_get_netns_cookie_sk_msg_proto; 8353 #ifdef CONFIG_CGROUP_NET_CLASSID 8354 case BPF_FUNC_get_cgroup_classid: 8355 return &bpf_get_cgroup_classid_curr_proto; 8356 #endif 8357 default: 8358 return bpf_sk_base_func_proto(func_id); 8359 } 8360 } 8361 8362 const struct bpf_func_proto bpf_sk_redirect_map_proto __weak; 8363 const struct bpf_func_proto bpf_sk_redirect_hash_proto __weak; 8364 8365 static const struct bpf_func_proto * 8366 sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8367 { 8368 switch (func_id) { 8369 case BPF_FUNC_skb_store_bytes: 8370 return &bpf_skb_store_bytes_proto; 8371 case BPF_FUNC_skb_load_bytes: 8372 return &bpf_skb_load_bytes_proto; 8373 case BPF_FUNC_skb_pull_data: 8374 return &sk_skb_pull_data_proto; 8375 case BPF_FUNC_skb_change_tail: 8376 return &sk_skb_change_tail_proto; 8377 case BPF_FUNC_skb_change_head: 8378 return &sk_skb_change_head_proto; 8379 case BPF_FUNC_skb_adjust_room: 8380 return &sk_skb_adjust_room_proto; 8381 case BPF_FUNC_get_socket_cookie: 8382 return &bpf_get_socket_cookie_proto; 8383 case BPF_FUNC_get_socket_uid: 8384 return &bpf_get_socket_uid_proto; 8385 case BPF_FUNC_sk_redirect_map: 8386 return &bpf_sk_redirect_map_proto; 8387 case BPF_FUNC_sk_redirect_hash: 8388 return &bpf_sk_redirect_hash_proto; 8389 case BPF_FUNC_perf_event_output: 8390 return &bpf_skb_event_output_proto; 8391 #ifdef CONFIG_INET 8392 case BPF_FUNC_sk_lookup_tcp: 8393 return &bpf_sk_lookup_tcp_proto; 8394 case BPF_FUNC_sk_lookup_udp: 8395 return &bpf_sk_lookup_udp_proto; 8396 case BPF_FUNC_sk_release: 8397 return &bpf_sk_release_proto; 8398 case BPF_FUNC_skc_lookup_tcp: 8399 return &bpf_skc_lookup_tcp_proto; 8400 #endif 8401 default: 8402 return bpf_sk_base_func_proto(func_id); 8403 } 8404 } 8405 8406 static const struct bpf_func_proto * 8407 flow_dissector_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8408 { 8409 switch (func_id) { 8410 case BPF_FUNC_skb_load_bytes: 8411 return &bpf_flow_dissector_load_bytes_proto; 8412 default: 8413 return bpf_sk_base_func_proto(func_id); 8414 } 8415 } 8416 8417 static const struct bpf_func_proto * 8418 lwt_out_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8419 { 8420 switch (func_id) { 8421 case BPF_FUNC_skb_load_bytes: 8422 return &bpf_skb_load_bytes_proto; 8423 case BPF_FUNC_skb_pull_data: 8424 return &bpf_skb_pull_data_proto; 8425 case BPF_FUNC_csum_diff: 8426 return &bpf_csum_diff_proto; 8427 case BPF_FUNC_get_cgroup_classid: 8428 return &bpf_get_cgroup_classid_proto; 8429 case BPF_FUNC_get_route_realm: 8430 return &bpf_get_route_realm_proto; 8431 case BPF_FUNC_get_hash_recalc: 8432 return &bpf_get_hash_recalc_proto; 8433 case BPF_FUNC_perf_event_output: 8434 return &bpf_skb_event_output_proto; 8435 case BPF_FUNC_get_smp_processor_id: 8436 return &bpf_get_smp_processor_id_proto; 8437 case BPF_FUNC_skb_under_cgroup: 8438 return &bpf_skb_under_cgroup_proto; 8439 default: 8440 return bpf_sk_base_func_proto(func_id); 8441 } 8442 } 8443 8444 static const struct bpf_func_proto * 8445 lwt_in_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8446 { 8447 switch (func_id) { 8448 case BPF_FUNC_lwt_push_encap: 8449 return &bpf_lwt_in_push_encap_proto; 8450 default: 8451 return lwt_out_func_proto(func_id, prog); 8452 } 8453 } 8454 8455 static const struct bpf_func_proto * 8456 lwt_xmit_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8457 { 8458 switch (func_id) { 8459 case BPF_FUNC_skb_get_tunnel_key: 8460 return &bpf_skb_get_tunnel_key_proto; 8461 case BPF_FUNC_skb_set_tunnel_key: 8462 return bpf_get_skb_set_tunnel_proto(func_id); 8463 case BPF_FUNC_skb_get_tunnel_opt: 8464 return &bpf_skb_get_tunnel_opt_proto; 8465 case BPF_FUNC_skb_set_tunnel_opt: 8466 return bpf_get_skb_set_tunnel_proto(func_id); 8467 case BPF_FUNC_redirect: 8468 return &bpf_redirect_proto; 8469 case BPF_FUNC_clone_redirect: 8470 return &bpf_clone_redirect_proto; 8471 case BPF_FUNC_skb_change_tail: 8472 return &bpf_skb_change_tail_proto; 8473 case BPF_FUNC_skb_change_head: 8474 return &bpf_skb_change_head_proto; 8475 case BPF_FUNC_skb_store_bytes: 8476 return &bpf_skb_store_bytes_proto; 8477 case BPF_FUNC_csum_update: 8478 return &bpf_csum_update_proto; 8479 case BPF_FUNC_csum_level: 8480 return &bpf_csum_level_proto; 8481 case BPF_FUNC_l3_csum_replace: 8482 return &bpf_l3_csum_replace_proto; 8483 case BPF_FUNC_l4_csum_replace: 8484 return &bpf_l4_csum_replace_proto; 8485 case BPF_FUNC_set_hash_invalid: 8486 return &bpf_set_hash_invalid_proto; 8487 case BPF_FUNC_lwt_push_encap: 8488 return &bpf_lwt_xmit_push_encap_proto; 8489 default: 8490 return lwt_out_func_proto(func_id, prog); 8491 } 8492 } 8493 8494 static const struct bpf_func_proto * 8495 lwt_seg6local_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8496 { 8497 switch (func_id) { 8498 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 8499 case BPF_FUNC_lwt_seg6_store_bytes: 8500 return &bpf_lwt_seg6_store_bytes_proto; 8501 case BPF_FUNC_lwt_seg6_action: 8502 return &bpf_lwt_seg6_action_proto; 8503 case BPF_FUNC_lwt_seg6_adjust_srh: 8504 return &bpf_lwt_seg6_adjust_srh_proto; 8505 #endif 8506 default: 8507 return lwt_out_func_proto(func_id, prog); 8508 } 8509 } 8510 8511 static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type, 8512 const struct bpf_prog *prog, 8513 struct bpf_insn_access_aux *info) 8514 { 8515 const int size_default = sizeof(__u32); 8516 8517 if (off < 0 || off >= sizeof(struct __sk_buff)) 8518 return false; 8519 8520 /* The verifier guarantees that size > 0. */ 8521 if (off % size != 0) 8522 return false; 8523 8524 switch (off) { 8525 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8526 if (off + size > offsetofend(struct __sk_buff, cb[4])) 8527 return false; 8528 break; 8529 case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]): 8530 case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]): 8531 case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4): 8532 case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4): 8533 case bpf_ctx_range(struct __sk_buff, data): 8534 case bpf_ctx_range(struct __sk_buff, data_meta): 8535 case bpf_ctx_range(struct __sk_buff, data_end): 8536 if (size != size_default) 8537 return false; 8538 break; 8539 case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): 8540 return false; 8541 case bpf_ctx_range(struct __sk_buff, hwtstamp): 8542 if (type == BPF_WRITE || size != sizeof(__u64)) 8543 return false; 8544 break; 8545 case bpf_ctx_range(struct __sk_buff, tstamp): 8546 if (size != sizeof(__u64)) 8547 return false; 8548 break; 8549 case offsetof(struct __sk_buff, sk): 8550 if (type == BPF_WRITE || size != sizeof(__u64)) 8551 return false; 8552 info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL; 8553 break; 8554 case offsetof(struct __sk_buff, tstamp_type): 8555 return false; 8556 case offsetofend(struct __sk_buff, tstamp_type) ... offsetof(struct __sk_buff, hwtstamp) - 1: 8557 /* Explicitly prohibit access to padding in __sk_buff. */ 8558 return false; 8559 default: 8560 /* Only narrow read access allowed for now. */ 8561 if (type == BPF_WRITE) { 8562 if (size != size_default) 8563 return false; 8564 } else { 8565 bpf_ctx_record_field_size(info, size_default); 8566 if (!bpf_ctx_narrow_access_ok(off, size, size_default)) 8567 return false; 8568 } 8569 } 8570 8571 return true; 8572 } 8573 8574 static bool sk_filter_is_valid_access(int off, int size, 8575 enum bpf_access_type type, 8576 const struct bpf_prog *prog, 8577 struct bpf_insn_access_aux *info) 8578 { 8579 switch (off) { 8580 case bpf_ctx_range(struct __sk_buff, tc_classid): 8581 case bpf_ctx_range(struct __sk_buff, data): 8582 case bpf_ctx_range(struct __sk_buff, data_meta): 8583 case bpf_ctx_range(struct __sk_buff, data_end): 8584 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 8585 case bpf_ctx_range(struct __sk_buff, tstamp): 8586 case bpf_ctx_range(struct __sk_buff, wire_len): 8587 case bpf_ctx_range(struct __sk_buff, hwtstamp): 8588 return false; 8589 } 8590 8591 if (type == BPF_WRITE) { 8592 switch (off) { 8593 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8594 break; 8595 default: 8596 return false; 8597 } 8598 } 8599 8600 return bpf_skb_is_valid_access(off, size, type, prog, info); 8601 } 8602 8603 static bool cg_skb_is_valid_access(int off, int size, 8604 enum bpf_access_type type, 8605 const struct bpf_prog *prog, 8606 struct bpf_insn_access_aux *info) 8607 { 8608 switch (off) { 8609 case bpf_ctx_range(struct __sk_buff, tc_classid): 8610 case bpf_ctx_range(struct __sk_buff, data_meta): 8611 case bpf_ctx_range(struct __sk_buff, wire_len): 8612 return false; 8613 case bpf_ctx_range(struct __sk_buff, data): 8614 case bpf_ctx_range(struct __sk_buff, data_end): 8615 if (!bpf_capable()) 8616 return false; 8617 break; 8618 } 8619 8620 if (type == BPF_WRITE) { 8621 switch (off) { 8622 case bpf_ctx_range(struct __sk_buff, mark): 8623 case bpf_ctx_range(struct __sk_buff, priority): 8624 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8625 break; 8626 case bpf_ctx_range(struct __sk_buff, tstamp): 8627 if (!bpf_capable()) 8628 return false; 8629 break; 8630 default: 8631 return false; 8632 } 8633 } 8634 8635 switch (off) { 8636 case bpf_ctx_range(struct __sk_buff, data): 8637 info->reg_type = PTR_TO_PACKET; 8638 break; 8639 case bpf_ctx_range(struct __sk_buff, data_end): 8640 info->reg_type = PTR_TO_PACKET_END; 8641 break; 8642 } 8643 8644 return bpf_skb_is_valid_access(off, size, type, prog, info); 8645 } 8646 8647 static bool lwt_is_valid_access(int off, int size, 8648 enum bpf_access_type type, 8649 const struct bpf_prog *prog, 8650 struct bpf_insn_access_aux *info) 8651 { 8652 switch (off) { 8653 case bpf_ctx_range(struct __sk_buff, tc_classid): 8654 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 8655 case bpf_ctx_range(struct __sk_buff, data_meta): 8656 case bpf_ctx_range(struct __sk_buff, tstamp): 8657 case bpf_ctx_range(struct __sk_buff, wire_len): 8658 case bpf_ctx_range(struct __sk_buff, hwtstamp): 8659 return false; 8660 } 8661 8662 if (type == BPF_WRITE) { 8663 switch (off) { 8664 case bpf_ctx_range(struct __sk_buff, mark): 8665 case bpf_ctx_range(struct __sk_buff, priority): 8666 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8667 break; 8668 default: 8669 return false; 8670 } 8671 } 8672 8673 switch (off) { 8674 case bpf_ctx_range(struct __sk_buff, data): 8675 info->reg_type = PTR_TO_PACKET; 8676 break; 8677 case bpf_ctx_range(struct __sk_buff, data_end): 8678 info->reg_type = PTR_TO_PACKET_END; 8679 break; 8680 } 8681 8682 return bpf_skb_is_valid_access(off, size, type, prog, info); 8683 } 8684 8685 /* Attach type specific accesses */ 8686 static bool __sock_filter_check_attach_type(int off, 8687 enum bpf_access_type access_type, 8688 enum bpf_attach_type attach_type) 8689 { 8690 switch (off) { 8691 case offsetof(struct bpf_sock, bound_dev_if): 8692 case offsetof(struct bpf_sock, mark): 8693 case offsetof(struct bpf_sock, priority): 8694 switch (attach_type) { 8695 case BPF_CGROUP_INET_SOCK_CREATE: 8696 case BPF_CGROUP_INET_SOCK_RELEASE: 8697 goto full_access; 8698 default: 8699 return false; 8700 } 8701 case bpf_ctx_range(struct bpf_sock, src_ip4): 8702 switch (attach_type) { 8703 case BPF_CGROUP_INET4_POST_BIND: 8704 goto read_only; 8705 default: 8706 return false; 8707 } 8708 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 8709 switch (attach_type) { 8710 case BPF_CGROUP_INET6_POST_BIND: 8711 goto read_only; 8712 default: 8713 return false; 8714 } 8715 case bpf_ctx_range(struct bpf_sock, src_port): 8716 switch (attach_type) { 8717 case BPF_CGROUP_INET4_POST_BIND: 8718 case BPF_CGROUP_INET6_POST_BIND: 8719 goto read_only; 8720 default: 8721 return false; 8722 } 8723 } 8724 read_only: 8725 return access_type == BPF_READ; 8726 full_access: 8727 return true; 8728 } 8729 8730 bool bpf_sock_common_is_valid_access(int off, int size, 8731 enum bpf_access_type type, 8732 struct bpf_insn_access_aux *info) 8733 { 8734 switch (off) { 8735 case bpf_ctx_range_till(struct bpf_sock, type, priority): 8736 return false; 8737 default: 8738 return bpf_sock_is_valid_access(off, size, type, info); 8739 } 8740 } 8741 8742 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, 8743 struct bpf_insn_access_aux *info) 8744 { 8745 const int size_default = sizeof(__u32); 8746 int field_size; 8747 8748 if (off < 0 || off >= sizeof(struct bpf_sock)) 8749 return false; 8750 if (off % size != 0) 8751 return false; 8752 8753 switch (off) { 8754 case offsetof(struct bpf_sock, state): 8755 case offsetof(struct bpf_sock, family): 8756 case offsetof(struct bpf_sock, type): 8757 case offsetof(struct bpf_sock, protocol): 8758 case offsetof(struct bpf_sock, src_port): 8759 case offsetof(struct bpf_sock, rx_queue_mapping): 8760 case bpf_ctx_range(struct bpf_sock, src_ip4): 8761 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 8762 case bpf_ctx_range(struct bpf_sock, dst_ip4): 8763 case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): 8764 bpf_ctx_record_field_size(info, size_default); 8765 return bpf_ctx_narrow_access_ok(off, size, size_default); 8766 case bpf_ctx_range(struct bpf_sock, dst_port): 8767 field_size = size == size_default ? 8768 size_default : sizeof_field(struct bpf_sock, dst_port); 8769 bpf_ctx_record_field_size(info, field_size); 8770 return bpf_ctx_narrow_access_ok(off, size, field_size); 8771 case offsetofend(struct bpf_sock, dst_port) ... 8772 offsetof(struct bpf_sock, dst_ip4) - 1: 8773 return false; 8774 } 8775 8776 return size == size_default; 8777 } 8778 8779 static bool sock_filter_is_valid_access(int off, int size, 8780 enum bpf_access_type type, 8781 const struct bpf_prog *prog, 8782 struct bpf_insn_access_aux *info) 8783 { 8784 if (!bpf_sock_is_valid_access(off, size, type, info)) 8785 return false; 8786 return __sock_filter_check_attach_type(off, type, 8787 prog->expected_attach_type); 8788 } 8789 8790 static int bpf_noop_prologue(struct bpf_insn *insn_buf, bool direct_write, 8791 const struct bpf_prog *prog) 8792 { 8793 /* Neither direct read nor direct write requires any preliminary 8794 * action. 8795 */ 8796 return 0; 8797 } 8798 8799 static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write, 8800 const struct bpf_prog *prog, int drop_verdict) 8801 { 8802 struct bpf_insn *insn = insn_buf; 8803 8804 if (!direct_write) 8805 return 0; 8806 8807 /* if (!skb->cloned) 8808 * goto start; 8809 * 8810 * (Fast-path, otherwise approximation that we might be 8811 * a clone, do the rest in helper.) 8812 */ 8813 *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET); 8814 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK); 8815 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7); 8816 8817 /* ret = bpf_skb_pull_data(skb, 0); */ 8818 *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1); 8819 *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2); 8820 *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, 8821 BPF_FUNC_skb_pull_data); 8822 /* if (!ret) 8823 * goto restore; 8824 * return TC_ACT_SHOT; 8825 */ 8826 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2); 8827 *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict); 8828 *insn++ = BPF_EXIT_INSN(); 8829 8830 /* restore: */ 8831 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6); 8832 /* start: */ 8833 *insn++ = prog->insnsi[0]; 8834 8835 return insn - insn_buf; 8836 } 8837 8838 static int bpf_gen_ld_abs(const struct bpf_insn *orig, 8839 struct bpf_insn *insn_buf) 8840 { 8841 bool indirect = BPF_MODE(orig->code) == BPF_IND; 8842 struct bpf_insn *insn = insn_buf; 8843 8844 if (!indirect) { 8845 *insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm); 8846 } else { 8847 *insn++ = BPF_MOV64_REG(BPF_REG_2, orig->src_reg); 8848 if (orig->imm) 8849 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm); 8850 } 8851 /* We're guaranteed here that CTX is in R6. */ 8852 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX); 8853 8854 switch (BPF_SIZE(orig->code)) { 8855 case BPF_B: 8856 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache); 8857 break; 8858 case BPF_H: 8859 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache); 8860 break; 8861 case BPF_W: 8862 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache); 8863 break; 8864 } 8865 8866 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 2); 8867 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0); 8868 *insn++ = BPF_EXIT_INSN(); 8869 8870 return insn - insn_buf; 8871 } 8872 8873 static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write, 8874 const struct bpf_prog *prog) 8875 { 8876 return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT); 8877 } 8878 8879 static bool tc_cls_act_is_valid_access(int off, int size, 8880 enum bpf_access_type type, 8881 const struct bpf_prog *prog, 8882 struct bpf_insn_access_aux *info) 8883 { 8884 if (type == BPF_WRITE) { 8885 switch (off) { 8886 case bpf_ctx_range(struct __sk_buff, mark): 8887 case bpf_ctx_range(struct __sk_buff, tc_index): 8888 case bpf_ctx_range(struct __sk_buff, priority): 8889 case bpf_ctx_range(struct __sk_buff, tc_classid): 8890 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8891 case bpf_ctx_range(struct __sk_buff, tstamp): 8892 case bpf_ctx_range(struct __sk_buff, queue_mapping): 8893 break; 8894 default: 8895 return false; 8896 } 8897 } 8898 8899 switch (off) { 8900 case bpf_ctx_range(struct __sk_buff, data): 8901 info->reg_type = PTR_TO_PACKET; 8902 break; 8903 case bpf_ctx_range(struct __sk_buff, data_meta): 8904 info->reg_type = PTR_TO_PACKET_META; 8905 break; 8906 case bpf_ctx_range(struct __sk_buff, data_end): 8907 info->reg_type = PTR_TO_PACKET_END; 8908 break; 8909 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 8910 return false; 8911 case offsetof(struct __sk_buff, tstamp_type): 8912 /* The convert_ctx_access() on reading and writing 8913 * __sk_buff->tstamp depends on whether the bpf prog 8914 * has used __sk_buff->tstamp_type or not. 8915 * Thus, we need to set prog->tstamp_type_access 8916 * earlier during is_valid_access() here. 8917 */ 8918 ((struct bpf_prog *)prog)->tstamp_type_access = 1; 8919 return size == sizeof(__u8); 8920 } 8921 8922 return bpf_skb_is_valid_access(off, size, type, prog, info); 8923 } 8924 8925 DEFINE_MUTEX(nf_conn_btf_access_lock); 8926 EXPORT_SYMBOL_GPL(nf_conn_btf_access_lock); 8927 8928 int (*nfct_btf_struct_access)(struct bpf_verifier_log *log, 8929 const struct bpf_reg_state *reg, 8930 int off, int size); 8931 EXPORT_SYMBOL_GPL(nfct_btf_struct_access); 8932 8933 static int tc_cls_act_btf_struct_access(struct bpf_verifier_log *log, 8934 const struct bpf_reg_state *reg, 8935 int off, int size) 8936 { 8937 int ret = -EACCES; 8938 8939 mutex_lock(&nf_conn_btf_access_lock); 8940 if (nfct_btf_struct_access) 8941 ret = nfct_btf_struct_access(log, reg, off, size); 8942 mutex_unlock(&nf_conn_btf_access_lock); 8943 8944 return ret; 8945 } 8946 8947 static bool __is_valid_xdp_access(int off, int size) 8948 { 8949 if (off < 0 || off >= sizeof(struct xdp_md)) 8950 return false; 8951 if (off % size != 0) 8952 return false; 8953 if (size != sizeof(__u32)) 8954 return false; 8955 8956 return true; 8957 } 8958 8959 static bool xdp_is_valid_access(int off, int size, 8960 enum bpf_access_type type, 8961 const struct bpf_prog *prog, 8962 struct bpf_insn_access_aux *info) 8963 { 8964 if (prog->expected_attach_type != BPF_XDP_DEVMAP) { 8965 switch (off) { 8966 case offsetof(struct xdp_md, egress_ifindex): 8967 return false; 8968 } 8969 } 8970 8971 if (type == BPF_WRITE) { 8972 if (bpf_prog_is_offloaded(prog->aux)) { 8973 switch (off) { 8974 case offsetof(struct xdp_md, rx_queue_index): 8975 return __is_valid_xdp_access(off, size); 8976 } 8977 } 8978 return false; 8979 } 8980 8981 switch (off) { 8982 case offsetof(struct xdp_md, data): 8983 info->reg_type = PTR_TO_PACKET; 8984 break; 8985 case offsetof(struct xdp_md, data_meta): 8986 info->reg_type = PTR_TO_PACKET_META; 8987 break; 8988 case offsetof(struct xdp_md, data_end): 8989 info->reg_type = PTR_TO_PACKET_END; 8990 break; 8991 } 8992 8993 return __is_valid_xdp_access(off, size); 8994 } 8995 8996 void bpf_warn_invalid_xdp_action(struct net_device *dev, struct bpf_prog *prog, u32 act) 8997 { 8998 const u32 act_max = XDP_REDIRECT; 8999 9000 pr_warn_once("%s XDP return value %u on prog %s (id %d) dev %s, expect packet loss!\n", 9001 act > act_max ? "Illegal" : "Driver unsupported", 9002 act, prog->aux->name, prog->aux->id, dev ? dev->name : "N/A"); 9003 } 9004 EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action); 9005 9006 static int xdp_btf_struct_access(struct bpf_verifier_log *log, 9007 const struct bpf_reg_state *reg, 9008 int off, int size) 9009 { 9010 int ret = -EACCES; 9011 9012 mutex_lock(&nf_conn_btf_access_lock); 9013 if (nfct_btf_struct_access) 9014 ret = nfct_btf_struct_access(log, reg, off, size); 9015 mutex_unlock(&nf_conn_btf_access_lock); 9016 9017 return ret; 9018 } 9019 9020 static bool sock_addr_is_valid_access(int off, int size, 9021 enum bpf_access_type type, 9022 const struct bpf_prog *prog, 9023 struct bpf_insn_access_aux *info) 9024 { 9025 const int size_default = sizeof(__u32); 9026 9027 if (off < 0 || off >= sizeof(struct bpf_sock_addr)) 9028 return false; 9029 if (off % size != 0) 9030 return false; 9031 9032 /* Disallow access to fields not belonging to the attach type's address 9033 * family. 9034 */ 9035 switch (off) { 9036 case bpf_ctx_range(struct bpf_sock_addr, user_ip4): 9037 switch (prog->expected_attach_type) { 9038 case BPF_CGROUP_INET4_BIND: 9039 case BPF_CGROUP_INET4_CONNECT: 9040 case BPF_CGROUP_INET4_GETPEERNAME: 9041 case BPF_CGROUP_INET4_GETSOCKNAME: 9042 case BPF_CGROUP_UDP4_SENDMSG: 9043 case BPF_CGROUP_UDP4_RECVMSG: 9044 break; 9045 default: 9046 return false; 9047 } 9048 break; 9049 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 9050 switch (prog->expected_attach_type) { 9051 case BPF_CGROUP_INET6_BIND: 9052 case BPF_CGROUP_INET6_CONNECT: 9053 case BPF_CGROUP_INET6_GETPEERNAME: 9054 case BPF_CGROUP_INET6_GETSOCKNAME: 9055 case BPF_CGROUP_UDP6_SENDMSG: 9056 case BPF_CGROUP_UDP6_RECVMSG: 9057 break; 9058 default: 9059 return false; 9060 } 9061 break; 9062 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): 9063 switch (prog->expected_attach_type) { 9064 case BPF_CGROUP_UDP4_SENDMSG: 9065 break; 9066 default: 9067 return false; 9068 } 9069 break; 9070 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 9071 msg_src_ip6[3]): 9072 switch (prog->expected_attach_type) { 9073 case BPF_CGROUP_UDP6_SENDMSG: 9074 break; 9075 default: 9076 return false; 9077 } 9078 break; 9079 } 9080 9081 switch (off) { 9082 case bpf_ctx_range(struct bpf_sock_addr, user_ip4): 9083 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 9084 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): 9085 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 9086 msg_src_ip6[3]): 9087 case bpf_ctx_range(struct bpf_sock_addr, user_port): 9088 if (type == BPF_READ) { 9089 bpf_ctx_record_field_size(info, size_default); 9090 9091 if (bpf_ctx_wide_access_ok(off, size, 9092 struct bpf_sock_addr, 9093 user_ip6)) 9094 return true; 9095 9096 if (bpf_ctx_wide_access_ok(off, size, 9097 struct bpf_sock_addr, 9098 msg_src_ip6)) 9099 return true; 9100 9101 if (!bpf_ctx_narrow_access_ok(off, size, size_default)) 9102 return false; 9103 } else { 9104 if (bpf_ctx_wide_access_ok(off, size, 9105 struct bpf_sock_addr, 9106 user_ip6)) 9107 return true; 9108 9109 if (bpf_ctx_wide_access_ok(off, size, 9110 struct bpf_sock_addr, 9111 msg_src_ip6)) 9112 return true; 9113 9114 if (size != size_default) 9115 return false; 9116 } 9117 break; 9118 case offsetof(struct bpf_sock_addr, sk): 9119 if (type != BPF_READ) 9120 return false; 9121 if (size != sizeof(__u64)) 9122 return false; 9123 info->reg_type = PTR_TO_SOCKET; 9124 break; 9125 default: 9126 if (type == BPF_READ) { 9127 if (size != size_default) 9128 return false; 9129 } else { 9130 return false; 9131 } 9132 } 9133 9134 return true; 9135 } 9136 9137 static bool sock_ops_is_valid_access(int off, int size, 9138 enum bpf_access_type type, 9139 const struct bpf_prog *prog, 9140 struct bpf_insn_access_aux *info) 9141 { 9142 const int size_default = sizeof(__u32); 9143 9144 if (off < 0 || off >= sizeof(struct bpf_sock_ops)) 9145 return false; 9146 9147 /* The verifier guarantees that size > 0. */ 9148 if (off % size != 0) 9149 return false; 9150 9151 if (type == BPF_WRITE) { 9152 switch (off) { 9153 case offsetof(struct bpf_sock_ops, reply): 9154 case offsetof(struct bpf_sock_ops, sk_txhash): 9155 if (size != size_default) 9156 return false; 9157 break; 9158 default: 9159 return false; 9160 } 9161 } else { 9162 switch (off) { 9163 case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received, 9164 bytes_acked): 9165 if (size != sizeof(__u64)) 9166 return false; 9167 break; 9168 case offsetof(struct bpf_sock_ops, sk): 9169 if (size != sizeof(__u64)) 9170 return false; 9171 info->reg_type = PTR_TO_SOCKET_OR_NULL; 9172 break; 9173 case offsetof(struct bpf_sock_ops, skb_data): 9174 if (size != sizeof(__u64)) 9175 return false; 9176 info->reg_type = PTR_TO_PACKET; 9177 break; 9178 case offsetof(struct bpf_sock_ops, skb_data_end): 9179 if (size != sizeof(__u64)) 9180 return false; 9181 info->reg_type = PTR_TO_PACKET_END; 9182 break; 9183 case offsetof(struct bpf_sock_ops, skb_tcp_flags): 9184 bpf_ctx_record_field_size(info, size_default); 9185 return bpf_ctx_narrow_access_ok(off, size, 9186 size_default); 9187 case offsetof(struct bpf_sock_ops, skb_hwtstamp): 9188 if (size != sizeof(__u64)) 9189 return false; 9190 break; 9191 default: 9192 if (size != size_default) 9193 return false; 9194 break; 9195 } 9196 } 9197 9198 return true; 9199 } 9200 9201 static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write, 9202 const struct bpf_prog *prog) 9203 { 9204 return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP); 9205 } 9206 9207 static bool sk_skb_is_valid_access(int off, int size, 9208 enum bpf_access_type type, 9209 const struct bpf_prog *prog, 9210 struct bpf_insn_access_aux *info) 9211 { 9212 switch (off) { 9213 case bpf_ctx_range(struct __sk_buff, tc_classid): 9214 case bpf_ctx_range(struct __sk_buff, data_meta): 9215 case bpf_ctx_range(struct __sk_buff, tstamp): 9216 case bpf_ctx_range(struct __sk_buff, wire_len): 9217 case bpf_ctx_range(struct __sk_buff, hwtstamp): 9218 return false; 9219 } 9220 9221 if (type == BPF_WRITE) { 9222 switch (off) { 9223 case bpf_ctx_range(struct __sk_buff, tc_index): 9224 case bpf_ctx_range(struct __sk_buff, priority): 9225 break; 9226 default: 9227 return false; 9228 } 9229 } 9230 9231 switch (off) { 9232 case bpf_ctx_range(struct __sk_buff, mark): 9233 return false; 9234 case bpf_ctx_range(struct __sk_buff, data): 9235 info->reg_type = PTR_TO_PACKET; 9236 break; 9237 case bpf_ctx_range(struct __sk_buff, data_end): 9238 info->reg_type = PTR_TO_PACKET_END; 9239 break; 9240 } 9241 9242 return bpf_skb_is_valid_access(off, size, type, prog, info); 9243 } 9244 9245 static bool sk_msg_is_valid_access(int off, int size, 9246 enum bpf_access_type type, 9247 const struct bpf_prog *prog, 9248 struct bpf_insn_access_aux *info) 9249 { 9250 if (type == BPF_WRITE) 9251 return false; 9252 9253 if (off % size != 0) 9254 return false; 9255 9256 switch (off) { 9257 case offsetof(struct sk_msg_md, data): 9258 info->reg_type = PTR_TO_PACKET; 9259 if (size != sizeof(__u64)) 9260 return false; 9261 break; 9262 case offsetof(struct sk_msg_md, data_end): 9263 info->reg_type = PTR_TO_PACKET_END; 9264 if (size != sizeof(__u64)) 9265 return false; 9266 break; 9267 case offsetof(struct sk_msg_md, sk): 9268 if (size != sizeof(__u64)) 9269 return false; 9270 info->reg_type = PTR_TO_SOCKET; 9271 break; 9272 case bpf_ctx_range(struct sk_msg_md, family): 9273 case bpf_ctx_range(struct sk_msg_md, remote_ip4): 9274 case bpf_ctx_range(struct sk_msg_md, local_ip4): 9275 case bpf_ctx_range_till(struct sk_msg_md, remote_ip6[0], remote_ip6[3]): 9276 case bpf_ctx_range_till(struct sk_msg_md, local_ip6[0], local_ip6[3]): 9277 case bpf_ctx_range(struct sk_msg_md, remote_port): 9278 case bpf_ctx_range(struct sk_msg_md, local_port): 9279 case bpf_ctx_range(struct sk_msg_md, size): 9280 if (size != sizeof(__u32)) 9281 return false; 9282 break; 9283 default: 9284 return false; 9285 } 9286 return true; 9287 } 9288 9289 static bool flow_dissector_is_valid_access(int off, int size, 9290 enum bpf_access_type type, 9291 const struct bpf_prog *prog, 9292 struct bpf_insn_access_aux *info) 9293 { 9294 const int size_default = sizeof(__u32); 9295 9296 if (off < 0 || off >= sizeof(struct __sk_buff)) 9297 return false; 9298 9299 if (type == BPF_WRITE) 9300 return false; 9301 9302 switch (off) { 9303 case bpf_ctx_range(struct __sk_buff, data): 9304 if (size != size_default) 9305 return false; 9306 info->reg_type = PTR_TO_PACKET; 9307 return true; 9308 case bpf_ctx_range(struct __sk_buff, data_end): 9309 if (size != size_default) 9310 return false; 9311 info->reg_type = PTR_TO_PACKET_END; 9312 return true; 9313 case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): 9314 if (size != sizeof(__u64)) 9315 return false; 9316 info->reg_type = PTR_TO_FLOW_KEYS; 9317 return true; 9318 default: 9319 return false; 9320 } 9321 } 9322 9323 static u32 flow_dissector_convert_ctx_access(enum bpf_access_type type, 9324 const struct bpf_insn *si, 9325 struct bpf_insn *insn_buf, 9326 struct bpf_prog *prog, 9327 u32 *target_size) 9328 9329 { 9330 struct bpf_insn *insn = insn_buf; 9331 9332 switch (si->off) { 9333 case offsetof(struct __sk_buff, data): 9334 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data), 9335 si->dst_reg, si->src_reg, 9336 offsetof(struct bpf_flow_dissector, data)); 9337 break; 9338 9339 case offsetof(struct __sk_buff, data_end): 9340 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data_end), 9341 si->dst_reg, si->src_reg, 9342 offsetof(struct bpf_flow_dissector, data_end)); 9343 break; 9344 9345 case offsetof(struct __sk_buff, flow_keys): 9346 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, flow_keys), 9347 si->dst_reg, si->src_reg, 9348 offsetof(struct bpf_flow_dissector, flow_keys)); 9349 break; 9350 } 9351 9352 return insn - insn_buf; 9353 } 9354 9355 static struct bpf_insn *bpf_convert_tstamp_type_read(const struct bpf_insn *si, 9356 struct bpf_insn *insn) 9357 { 9358 __u8 value_reg = si->dst_reg; 9359 __u8 skb_reg = si->src_reg; 9360 /* AX is needed because src_reg and dst_reg could be the same */ 9361 __u8 tmp_reg = BPF_REG_AX; 9362 9363 *insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg, 9364 SKB_BF_MONO_TC_OFFSET); 9365 *insn++ = BPF_JMP32_IMM(BPF_JSET, tmp_reg, 9366 SKB_MONO_DELIVERY_TIME_MASK, 2); 9367 *insn++ = BPF_MOV32_IMM(value_reg, BPF_SKB_TSTAMP_UNSPEC); 9368 *insn++ = BPF_JMP_A(1); 9369 *insn++ = BPF_MOV32_IMM(value_reg, BPF_SKB_TSTAMP_DELIVERY_MONO); 9370 9371 return insn; 9372 } 9373 9374 static struct bpf_insn *bpf_convert_shinfo_access(__u8 dst_reg, __u8 skb_reg, 9375 struct bpf_insn *insn) 9376 { 9377 /* si->dst_reg = skb_shinfo(SKB); */ 9378 #ifdef NET_SKBUFF_DATA_USES_OFFSET 9379 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), 9380 BPF_REG_AX, skb_reg, 9381 offsetof(struct sk_buff, end)); 9382 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, head), 9383 dst_reg, skb_reg, 9384 offsetof(struct sk_buff, head)); 9385 *insn++ = BPF_ALU64_REG(BPF_ADD, dst_reg, BPF_REG_AX); 9386 #else 9387 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), 9388 dst_reg, skb_reg, 9389 offsetof(struct sk_buff, end)); 9390 #endif 9391 9392 return insn; 9393 } 9394 9395 static struct bpf_insn *bpf_convert_tstamp_read(const struct bpf_prog *prog, 9396 const struct bpf_insn *si, 9397 struct bpf_insn *insn) 9398 { 9399 __u8 value_reg = si->dst_reg; 9400 __u8 skb_reg = si->src_reg; 9401 9402 #ifdef CONFIG_NET_XGRESS 9403 /* If the tstamp_type is read, 9404 * the bpf prog is aware the tstamp could have delivery time. 9405 * Thus, read skb->tstamp as is if tstamp_type_access is true. 9406 */ 9407 if (!prog->tstamp_type_access) { 9408 /* AX is needed because src_reg and dst_reg could be the same */ 9409 __u8 tmp_reg = BPF_REG_AX; 9410 9411 *insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg, SKB_BF_MONO_TC_OFFSET); 9412 *insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg, 9413 TC_AT_INGRESS_MASK | SKB_MONO_DELIVERY_TIME_MASK); 9414 *insn++ = BPF_JMP32_IMM(BPF_JNE, tmp_reg, 9415 TC_AT_INGRESS_MASK | SKB_MONO_DELIVERY_TIME_MASK, 2); 9416 /* skb->tc_at_ingress && skb->mono_delivery_time, 9417 * read 0 as the (rcv) timestamp. 9418 */ 9419 *insn++ = BPF_MOV64_IMM(value_reg, 0); 9420 *insn++ = BPF_JMP_A(1); 9421 } 9422 #endif 9423 9424 *insn++ = BPF_LDX_MEM(BPF_DW, value_reg, skb_reg, 9425 offsetof(struct sk_buff, tstamp)); 9426 return insn; 9427 } 9428 9429 static struct bpf_insn *bpf_convert_tstamp_write(const struct bpf_prog *prog, 9430 const struct bpf_insn *si, 9431 struct bpf_insn *insn) 9432 { 9433 __u8 value_reg = si->src_reg; 9434 __u8 skb_reg = si->dst_reg; 9435 9436 #ifdef CONFIG_NET_XGRESS 9437 /* If the tstamp_type is read, 9438 * the bpf prog is aware the tstamp could have delivery time. 9439 * Thus, write skb->tstamp as is if tstamp_type_access is true. 9440 * Otherwise, writing at ingress will have to clear the 9441 * mono_delivery_time bit also. 9442 */ 9443 if (!prog->tstamp_type_access) { 9444 __u8 tmp_reg = BPF_REG_AX; 9445 9446 *insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg, SKB_BF_MONO_TC_OFFSET); 9447 /* Writing __sk_buff->tstamp as ingress, goto <clear> */ 9448 *insn++ = BPF_JMP32_IMM(BPF_JSET, tmp_reg, TC_AT_INGRESS_MASK, 1); 9449 /* goto <store> */ 9450 *insn++ = BPF_JMP_A(2); 9451 /* <clear>: mono_delivery_time */ 9452 *insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg, ~SKB_MONO_DELIVERY_TIME_MASK); 9453 *insn++ = BPF_STX_MEM(BPF_B, skb_reg, tmp_reg, SKB_BF_MONO_TC_OFFSET); 9454 } 9455 #endif 9456 9457 /* <store>: skb->tstamp = tstamp */ 9458 *insn++ = BPF_RAW_INSN(BPF_CLASS(si->code) | BPF_DW | BPF_MEM, 9459 skb_reg, value_reg, offsetof(struct sk_buff, tstamp), si->imm); 9460 return insn; 9461 } 9462 9463 #define BPF_EMIT_STORE(size, si, off) \ 9464 BPF_RAW_INSN(BPF_CLASS((si)->code) | (size) | BPF_MEM, \ 9465 (si)->dst_reg, (si)->src_reg, (off), (si)->imm) 9466 9467 static u32 bpf_convert_ctx_access(enum bpf_access_type type, 9468 const struct bpf_insn *si, 9469 struct bpf_insn *insn_buf, 9470 struct bpf_prog *prog, u32 *target_size) 9471 { 9472 struct bpf_insn *insn = insn_buf; 9473 int off; 9474 9475 switch (si->off) { 9476 case offsetof(struct __sk_buff, len): 9477 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9478 bpf_target_off(struct sk_buff, len, 4, 9479 target_size)); 9480 break; 9481 9482 case offsetof(struct __sk_buff, protocol): 9483 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9484 bpf_target_off(struct sk_buff, protocol, 2, 9485 target_size)); 9486 break; 9487 9488 case offsetof(struct __sk_buff, vlan_proto): 9489 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9490 bpf_target_off(struct sk_buff, vlan_proto, 2, 9491 target_size)); 9492 break; 9493 9494 case offsetof(struct __sk_buff, priority): 9495 if (type == BPF_WRITE) 9496 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9497 bpf_target_off(struct sk_buff, priority, 4, 9498 target_size)); 9499 else 9500 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9501 bpf_target_off(struct sk_buff, priority, 4, 9502 target_size)); 9503 break; 9504 9505 case offsetof(struct __sk_buff, ingress_ifindex): 9506 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9507 bpf_target_off(struct sk_buff, skb_iif, 4, 9508 target_size)); 9509 break; 9510 9511 case offsetof(struct __sk_buff, ifindex): 9512 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 9513 si->dst_reg, si->src_reg, 9514 offsetof(struct sk_buff, dev)); 9515 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 9516 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9517 bpf_target_off(struct net_device, ifindex, 4, 9518 target_size)); 9519 break; 9520 9521 case offsetof(struct __sk_buff, hash): 9522 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9523 bpf_target_off(struct sk_buff, hash, 4, 9524 target_size)); 9525 break; 9526 9527 case offsetof(struct __sk_buff, mark): 9528 if (type == BPF_WRITE) 9529 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9530 bpf_target_off(struct sk_buff, mark, 4, 9531 target_size)); 9532 else 9533 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9534 bpf_target_off(struct sk_buff, mark, 4, 9535 target_size)); 9536 break; 9537 9538 case offsetof(struct __sk_buff, pkt_type): 9539 *target_size = 1; 9540 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, 9541 PKT_TYPE_OFFSET); 9542 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX); 9543 #ifdef __BIG_ENDIAN_BITFIELD 9544 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5); 9545 #endif 9546 break; 9547 9548 case offsetof(struct __sk_buff, queue_mapping): 9549 if (type == BPF_WRITE) { 9550 u32 off = bpf_target_off(struct sk_buff, queue_mapping, 2, target_size); 9551 9552 if (BPF_CLASS(si->code) == BPF_ST && si->imm >= NO_QUEUE_MAPPING) { 9553 *insn++ = BPF_JMP_A(0); /* noop */ 9554 break; 9555 } 9556 9557 if (BPF_CLASS(si->code) == BPF_STX) 9558 *insn++ = BPF_JMP_IMM(BPF_JGE, si->src_reg, NO_QUEUE_MAPPING, 1); 9559 *insn++ = BPF_EMIT_STORE(BPF_H, si, off); 9560 } else { 9561 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9562 bpf_target_off(struct sk_buff, 9563 queue_mapping, 9564 2, target_size)); 9565 } 9566 break; 9567 9568 case offsetof(struct __sk_buff, vlan_present): 9569 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9570 bpf_target_off(struct sk_buff, 9571 vlan_all, 4, target_size)); 9572 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 9573 *insn++ = BPF_ALU32_IMM(BPF_MOV, si->dst_reg, 1); 9574 break; 9575 9576 case offsetof(struct __sk_buff, vlan_tci): 9577 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9578 bpf_target_off(struct sk_buff, vlan_tci, 2, 9579 target_size)); 9580 break; 9581 9582 case offsetof(struct __sk_buff, cb[0]) ... 9583 offsetofend(struct __sk_buff, cb[4]) - 1: 9584 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, data) < 20); 9585 BUILD_BUG_ON((offsetof(struct sk_buff, cb) + 9586 offsetof(struct qdisc_skb_cb, data)) % 9587 sizeof(__u64)); 9588 9589 prog->cb_access = 1; 9590 off = si->off; 9591 off -= offsetof(struct __sk_buff, cb[0]); 9592 off += offsetof(struct sk_buff, cb); 9593 off += offsetof(struct qdisc_skb_cb, data); 9594 if (type == BPF_WRITE) 9595 *insn++ = BPF_EMIT_STORE(BPF_SIZE(si->code), si, off); 9596 else 9597 *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg, 9598 si->src_reg, off); 9599 break; 9600 9601 case offsetof(struct __sk_buff, tc_classid): 9602 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, tc_classid) != 2); 9603 9604 off = si->off; 9605 off -= offsetof(struct __sk_buff, tc_classid); 9606 off += offsetof(struct sk_buff, cb); 9607 off += offsetof(struct qdisc_skb_cb, tc_classid); 9608 *target_size = 2; 9609 if (type == BPF_WRITE) 9610 *insn++ = BPF_EMIT_STORE(BPF_H, si, off); 9611 else 9612 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, 9613 si->src_reg, off); 9614 break; 9615 9616 case offsetof(struct __sk_buff, data): 9617 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 9618 si->dst_reg, si->src_reg, 9619 offsetof(struct sk_buff, data)); 9620 break; 9621 9622 case offsetof(struct __sk_buff, data_meta): 9623 off = si->off; 9624 off -= offsetof(struct __sk_buff, data_meta); 9625 off += offsetof(struct sk_buff, cb); 9626 off += offsetof(struct bpf_skb_data_end, data_meta); 9627 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, 9628 si->src_reg, off); 9629 break; 9630 9631 case offsetof(struct __sk_buff, data_end): 9632 off = si->off; 9633 off -= offsetof(struct __sk_buff, data_end); 9634 off += offsetof(struct sk_buff, cb); 9635 off += offsetof(struct bpf_skb_data_end, data_end); 9636 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, 9637 si->src_reg, off); 9638 break; 9639 9640 case offsetof(struct __sk_buff, tc_index): 9641 #ifdef CONFIG_NET_SCHED 9642 if (type == BPF_WRITE) 9643 *insn++ = BPF_EMIT_STORE(BPF_H, si, 9644 bpf_target_off(struct sk_buff, tc_index, 2, 9645 target_size)); 9646 else 9647 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9648 bpf_target_off(struct sk_buff, tc_index, 2, 9649 target_size)); 9650 #else 9651 *target_size = 2; 9652 if (type == BPF_WRITE) 9653 *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg); 9654 else 9655 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 9656 #endif 9657 break; 9658 9659 case offsetof(struct __sk_buff, napi_id): 9660 #if defined(CONFIG_NET_RX_BUSY_POLL) 9661 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9662 bpf_target_off(struct sk_buff, napi_id, 4, 9663 target_size)); 9664 *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1); 9665 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 9666 #else 9667 *target_size = 4; 9668 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 9669 #endif 9670 break; 9671 case offsetof(struct __sk_buff, family): 9672 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); 9673 9674 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9675 si->dst_reg, si->src_reg, 9676 offsetof(struct sk_buff, sk)); 9677 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 9678 bpf_target_off(struct sock_common, 9679 skc_family, 9680 2, target_size)); 9681 break; 9682 case offsetof(struct __sk_buff, remote_ip4): 9683 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); 9684 9685 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9686 si->dst_reg, si->src_reg, 9687 offsetof(struct sk_buff, sk)); 9688 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9689 bpf_target_off(struct sock_common, 9690 skc_daddr, 9691 4, target_size)); 9692 break; 9693 case offsetof(struct __sk_buff, local_ip4): 9694 BUILD_BUG_ON(sizeof_field(struct sock_common, 9695 skc_rcv_saddr) != 4); 9696 9697 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9698 si->dst_reg, si->src_reg, 9699 offsetof(struct sk_buff, sk)); 9700 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9701 bpf_target_off(struct sock_common, 9702 skc_rcv_saddr, 9703 4, target_size)); 9704 break; 9705 case offsetof(struct __sk_buff, remote_ip6[0]) ... 9706 offsetof(struct __sk_buff, remote_ip6[3]): 9707 #if IS_ENABLED(CONFIG_IPV6) 9708 BUILD_BUG_ON(sizeof_field(struct sock_common, 9709 skc_v6_daddr.s6_addr32[0]) != 4); 9710 9711 off = si->off; 9712 off -= offsetof(struct __sk_buff, remote_ip6[0]); 9713 9714 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9715 si->dst_reg, si->src_reg, 9716 offsetof(struct sk_buff, sk)); 9717 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9718 offsetof(struct sock_common, 9719 skc_v6_daddr.s6_addr32[0]) + 9720 off); 9721 #else 9722 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9723 #endif 9724 break; 9725 case offsetof(struct __sk_buff, local_ip6[0]) ... 9726 offsetof(struct __sk_buff, local_ip6[3]): 9727 #if IS_ENABLED(CONFIG_IPV6) 9728 BUILD_BUG_ON(sizeof_field(struct sock_common, 9729 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 9730 9731 off = si->off; 9732 off -= offsetof(struct __sk_buff, local_ip6[0]); 9733 9734 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9735 si->dst_reg, si->src_reg, 9736 offsetof(struct sk_buff, sk)); 9737 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9738 offsetof(struct sock_common, 9739 skc_v6_rcv_saddr.s6_addr32[0]) + 9740 off); 9741 #else 9742 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9743 #endif 9744 break; 9745 9746 case offsetof(struct __sk_buff, remote_port): 9747 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); 9748 9749 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9750 si->dst_reg, si->src_reg, 9751 offsetof(struct sk_buff, sk)); 9752 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 9753 bpf_target_off(struct sock_common, 9754 skc_dport, 9755 2, target_size)); 9756 #ifndef __BIG_ENDIAN_BITFIELD 9757 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 9758 #endif 9759 break; 9760 9761 case offsetof(struct __sk_buff, local_port): 9762 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); 9763 9764 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9765 si->dst_reg, si->src_reg, 9766 offsetof(struct sk_buff, sk)); 9767 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 9768 bpf_target_off(struct sock_common, 9769 skc_num, 2, target_size)); 9770 break; 9771 9772 case offsetof(struct __sk_buff, tstamp): 9773 BUILD_BUG_ON(sizeof_field(struct sk_buff, tstamp) != 8); 9774 9775 if (type == BPF_WRITE) 9776 insn = bpf_convert_tstamp_write(prog, si, insn); 9777 else 9778 insn = bpf_convert_tstamp_read(prog, si, insn); 9779 break; 9780 9781 case offsetof(struct __sk_buff, tstamp_type): 9782 insn = bpf_convert_tstamp_type_read(si, insn); 9783 break; 9784 9785 case offsetof(struct __sk_buff, gso_segs): 9786 insn = bpf_convert_shinfo_access(si->dst_reg, si->src_reg, insn); 9787 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_segs), 9788 si->dst_reg, si->dst_reg, 9789 bpf_target_off(struct skb_shared_info, 9790 gso_segs, 2, 9791 target_size)); 9792 break; 9793 case offsetof(struct __sk_buff, gso_size): 9794 insn = bpf_convert_shinfo_access(si->dst_reg, si->src_reg, insn); 9795 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_size), 9796 si->dst_reg, si->dst_reg, 9797 bpf_target_off(struct skb_shared_info, 9798 gso_size, 2, 9799 target_size)); 9800 break; 9801 case offsetof(struct __sk_buff, wire_len): 9802 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, pkt_len) != 4); 9803 9804 off = si->off; 9805 off -= offsetof(struct __sk_buff, wire_len); 9806 off += offsetof(struct sk_buff, cb); 9807 off += offsetof(struct qdisc_skb_cb, pkt_len); 9808 *target_size = 4; 9809 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, off); 9810 break; 9811 9812 case offsetof(struct __sk_buff, sk): 9813 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9814 si->dst_reg, si->src_reg, 9815 offsetof(struct sk_buff, sk)); 9816 break; 9817 case offsetof(struct __sk_buff, hwtstamp): 9818 BUILD_BUG_ON(sizeof_field(struct skb_shared_hwtstamps, hwtstamp) != 8); 9819 BUILD_BUG_ON(offsetof(struct skb_shared_hwtstamps, hwtstamp) != 0); 9820 9821 insn = bpf_convert_shinfo_access(si->dst_reg, si->src_reg, insn); 9822 *insn++ = BPF_LDX_MEM(BPF_DW, 9823 si->dst_reg, si->dst_reg, 9824 bpf_target_off(struct skb_shared_info, 9825 hwtstamps, 8, 9826 target_size)); 9827 break; 9828 } 9829 9830 return insn - insn_buf; 9831 } 9832 9833 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 9834 const struct bpf_insn *si, 9835 struct bpf_insn *insn_buf, 9836 struct bpf_prog *prog, u32 *target_size) 9837 { 9838 struct bpf_insn *insn = insn_buf; 9839 int off; 9840 9841 switch (si->off) { 9842 case offsetof(struct bpf_sock, bound_dev_if): 9843 BUILD_BUG_ON(sizeof_field(struct sock, sk_bound_dev_if) != 4); 9844 9845 if (type == BPF_WRITE) 9846 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9847 offsetof(struct sock, sk_bound_dev_if)); 9848 else 9849 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9850 offsetof(struct sock, sk_bound_dev_if)); 9851 break; 9852 9853 case offsetof(struct bpf_sock, mark): 9854 BUILD_BUG_ON(sizeof_field(struct sock, sk_mark) != 4); 9855 9856 if (type == BPF_WRITE) 9857 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9858 offsetof(struct sock, sk_mark)); 9859 else 9860 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9861 offsetof(struct sock, sk_mark)); 9862 break; 9863 9864 case offsetof(struct bpf_sock, priority): 9865 BUILD_BUG_ON(sizeof_field(struct sock, sk_priority) != 4); 9866 9867 if (type == BPF_WRITE) 9868 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9869 offsetof(struct sock, sk_priority)); 9870 else 9871 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9872 offsetof(struct sock, sk_priority)); 9873 break; 9874 9875 case offsetof(struct bpf_sock, family): 9876 *insn++ = BPF_LDX_MEM( 9877 BPF_FIELD_SIZEOF(struct sock_common, skc_family), 9878 si->dst_reg, si->src_reg, 9879 bpf_target_off(struct sock_common, 9880 skc_family, 9881 sizeof_field(struct sock_common, 9882 skc_family), 9883 target_size)); 9884 break; 9885 9886 case offsetof(struct bpf_sock, type): 9887 *insn++ = BPF_LDX_MEM( 9888 BPF_FIELD_SIZEOF(struct sock, sk_type), 9889 si->dst_reg, si->src_reg, 9890 bpf_target_off(struct sock, sk_type, 9891 sizeof_field(struct sock, sk_type), 9892 target_size)); 9893 break; 9894 9895 case offsetof(struct bpf_sock, protocol): 9896 *insn++ = BPF_LDX_MEM( 9897 BPF_FIELD_SIZEOF(struct sock, sk_protocol), 9898 si->dst_reg, si->src_reg, 9899 bpf_target_off(struct sock, sk_protocol, 9900 sizeof_field(struct sock, sk_protocol), 9901 target_size)); 9902 break; 9903 9904 case offsetof(struct bpf_sock, src_ip4): 9905 *insn++ = BPF_LDX_MEM( 9906 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 9907 bpf_target_off(struct sock_common, skc_rcv_saddr, 9908 sizeof_field(struct sock_common, 9909 skc_rcv_saddr), 9910 target_size)); 9911 break; 9912 9913 case offsetof(struct bpf_sock, dst_ip4): 9914 *insn++ = BPF_LDX_MEM( 9915 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 9916 bpf_target_off(struct sock_common, skc_daddr, 9917 sizeof_field(struct sock_common, 9918 skc_daddr), 9919 target_size)); 9920 break; 9921 9922 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 9923 #if IS_ENABLED(CONFIG_IPV6) 9924 off = si->off; 9925 off -= offsetof(struct bpf_sock, src_ip6[0]); 9926 *insn++ = BPF_LDX_MEM( 9927 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 9928 bpf_target_off( 9929 struct sock_common, 9930 skc_v6_rcv_saddr.s6_addr32[0], 9931 sizeof_field(struct sock_common, 9932 skc_v6_rcv_saddr.s6_addr32[0]), 9933 target_size) + off); 9934 #else 9935 (void)off; 9936 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9937 #endif 9938 break; 9939 9940 case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): 9941 #if IS_ENABLED(CONFIG_IPV6) 9942 off = si->off; 9943 off -= offsetof(struct bpf_sock, dst_ip6[0]); 9944 *insn++ = BPF_LDX_MEM( 9945 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 9946 bpf_target_off(struct sock_common, 9947 skc_v6_daddr.s6_addr32[0], 9948 sizeof_field(struct sock_common, 9949 skc_v6_daddr.s6_addr32[0]), 9950 target_size) + off); 9951 #else 9952 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9953 *target_size = 4; 9954 #endif 9955 break; 9956 9957 case offsetof(struct bpf_sock, src_port): 9958 *insn++ = BPF_LDX_MEM( 9959 BPF_FIELD_SIZEOF(struct sock_common, skc_num), 9960 si->dst_reg, si->src_reg, 9961 bpf_target_off(struct sock_common, skc_num, 9962 sizeof_field(struct sock_common, 9963 skc_num), 9964 target_size)); 9965 break; 9966 9967 case offsetof(struct bpf_sock, dst_port): 9968 *insn++ = BPF_LDX_MEM( 9969 BPF_FIELD_SIZEOF(struct sock_common, skc_dport), 9970 si->dst_reg, si->src_reg, 9971 bpf_target_off(struct sock_common, skc_dport, 9972 sizeof_field(struct sock_common, 9973 skc_dport), 9974 target_size)); 9975 break; 9976 9977 case offsetof(struct bpf_sock, state): 9978 *insn++ = BPF_LDX_MEM( 9979 BPF_FIELD_SIZEOF(struct sock_common, skc_state), 9980 si->dst_reg, si->src_reg, 9981 bpf_target_off(struct sock_common, skc_state, 9982 sizeof_field(struct sock_common, 9983 skc_state), 9984 target_size)); 9985 break; 9986 case offsetof(struct bpf_sock, rx_queue_mapping): 9987 #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING 9988 *insn++ = BPF_LDX_MEM( 9989 BPF_FIELD_SIZEOF(struct sock, sk_rx_queue_mapping), 9990 si->dst_reg, si->src_reg, 9991 bpf_target_off(struct sock, sk_rx_queue_mapping, 9992 sizeof_field(struct sock, 9993 sk_rx_queue_mapping), 9994 target_size)); 9995 *insn++ = BPF_JMP_IMM(BPF_JNE, si->dst_reg, NO_QUEUE_MAPPING, 9996 1); 9997 *insn++ = BPF_MOV64_IMM(si->dst_reg, -1); 9998 #else 9999 *insn++ = BPF_MOV64_IMM(si->dst_reg, -1); 10000 *target_size = 2; 10001 #endif 10002 break; 10003 } 10004 10005 return insn - insn_buf; 10006 } 10007 10008 static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type, 10009 const struct bpf_insn *si, 10010 struct bpf_insn *insn_buf, 10011 struct bpf_prog *prog, u32 *target_size) 10012 { 10013 struct bpf_insn *insn = insn_buf; 10014 10015 switch (si->off) { 10016 case offsetof(struct __sk_buff, ifindex): 10017 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 10018 si->dst_reg, si->src_reg, 10019 offsetof(struct sk_buff, dev)); 10020 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10021 bpf_target_off(struct net_device, ifindex, 4, 10022 target_size)); 10023 break; 10024 default: 10025 return bpf_convert_ctx_access(type, si, insn_buf, prog, 10026 target_size); 10027 } 10028 10029 return insn - insn_buf; 10030 } 10031 10032 static u32 xdp_convert_ctx_access(enum bpf_access_type type, 10033 const struct bpf_insn *si, 10034 struct bpf_insn *insn_buf, 10035 struct bpf_prog *prog, u32 *target_size) 10036 { 10037 struct bpf_insn *insn = insn_buf; 10038 10039 switch (si->off) { 10040 case offsetof(struct xdp_md, data): 10041 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data), 10042 si->dst_reg, si->src_reg, 10043 offsetof(struct xdp_buff, data)); 10044 break; 10045 case offsetof(struct xdp_md, data_meta): 10046 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta), 10047 si->dst_reg, si->src_reg, 10048 offsetof(struct xdp_buff, data_meta)); 10049 break; 10050 case offsetof(struct xdp_md, data_end): 10051 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end), 10052 si->dst_reg, si->src_reg, 10053 offsetof(struct xdp_buff, data_end)); 10054 break; 10055 case offsetof(struct xdp_md, ingress_ifindex): 10056 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), 10057 si->dst_reg, si->src_reg, 10058 offsetof(struct xdp_buff, rxq)); 10059 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev), 10060 si->dst_reg, si->dst_reg, 10061 offsetof(struct xdp_rxq_info, dev)); 10062 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10063 offsetof(struct net_device, ifindex)); 10064 break; 10065 case offsetof(struct xdp_md, rx_queue_index): 10066 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), 10067 si->dst_reg, si->src_reg, 10068 offsetof(struct xdp_buff, rxq)); 10069 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10070 offsetof(struct xdp_rxq_info, 10071 queue_index)); 10072 break; 10073 case offsetof(struct xdp_md, egress_ifindex): 10074 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, txq), 10075 si->dst_reg, si->src_reg, 10076 offsetof(struct xdp_buff, txq)); 10077 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_txq_info, dev), 10078 si->dst_reg, si->dst_reg, 10079 offsetof(struct xdp_txq_info, dev)); 10080 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10081 offsetof(struct net_device, ifindex)); 10082 break; 10083 } 10084 10085 return insn - insn_buf; 10086 } 10087 10088 /* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of 10089 * context Structure, F is Field in context structure that contains a pointer 10090 * to Nested Structure of type NS that has the field NF. 10091 * 10092 * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make 10093 * sure that SIZE is not greater than actual size of S.F.NF. 10094 * 10095 * If offset OFF is provided, the load happens from that offset relative to 10096 * offset of NF. 10097 */ 10098 #define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF) \ 10099 do { \ 10100 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg, \ 10101 si->src_reg, offsetof(S, F)); \ 10102 *insn++ = BPF_LDX_MEM( \ 10103 SIZE, si->dst_reg, si->dst_reg, \ 10104 bpf_target_off(NS, NF, sizeof_field(NS, NF), \ 10105 target_size) \ 10106 + OFF); \ 10107 } while (0) 10108 10109 #define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF) \ 10110 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, \ 10111 BPF_FIELD_SIZEOF(NS, NF), 0) 10112 10113 /* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to 10114 * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation. 10115 * 10116 * In addition it uses Temporary Field TF (member of struct S) as the 3rd 10117 * "register" since two registers available in convert_ctx_access are not 10118 * enough: we can't override neither SRC, since it contains value to store, nor 10119 * DST since it contains pointer to context that may be used by later 10120 * instructions. But we need a temporary place to save pointer to nested 10121 * structure whose field we want to store to. 10122 */ 10123 #define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, OFF, TF) \ 10124 do { \ 10125 int tmp_reg = BPF_REG_9; \ 10126 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ 10127 --tmp_reg; \ 10128 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ 10129 --tmp_reg; \ 10130 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg, \ 10131 offsetof(S, TF)); \ 10132 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg, \ 10133 si->dst_reg, offsetof(S, F)); \ 10134 *insn++ = BPF_RAW_INSN(SIZE | BPF_MEM | BPF_CLASS(si->code), \ 10135 tmp_reg, si->src_reg, \ 10136 bpf_target_off(NS, NF, sizeof_field(NS, NF), \ 10137 target_size) \ 10138 + OFF, \ 10139 si->imm); \ 10140 *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg, \ 10141 offsetof(S, TF)); \ 10142 } while (0) 10143 10144 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \ 10145 TF) \ 10146 do { \ 10147 if (type == BPF_WRITE) { \ 10148 SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, \ 10149 OFF, TF); \ 10150 } else { \ 10151 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( \ 10152 S, NS, F, NF, SIZE, OFF); \ 10153 } \ 10154 } while (0) 10155 10156 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF) \ 10157 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( \ 10158 S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF) 10159 10160 static u32 sock_addr_convert_ctx_access(enum bpf_access_type type, 10161 const struct bpf_insn *si, 10162 struct bpf_insn *insn_buf, 10163 struct bpf_prog *prog, u32 *target_size) 10164 { 10165 int off, port_size = sizeof_field(struct sockaddr_in6, sin6_port); 10166 struct bpf_insn *insn = insn_buf; 10167 10168 switch (si->off) { 10169 case offsetof(struct bpf_sock_addr, user_family): 10170 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 10171 struct sockaddr, uaddr, sa_family); 10172 break; 10173 10174 case offsetof(struct bpf_sock_addr, user_ip4): 10175 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10176 struct bpf_sock_addr_kern, struct sockaddr_in, uaddr, 10177 sin_addr, BPF_SIZE(si->code), 0, tmp_reg); 10178 break; 10179 10180 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 10181 off = si->off; 10182 off -= offsetof(struct bpf_sock_addr, user_ip6[0]); 10183 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10184 struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr, 10185 sin6_addr.s6_addr32[0], BPF_SIZE(si->code), off, 10186 tmp_reg); 10187 break; 10188 10189 case offsetof(struct bpf_sock_addr, user_port): 10190 /* To get port we need to know sa_family first and then treat 10191 * sockaddr as either sockaddr_in or sockaddr_in6. 10192 * Though we can simplify since port field has same offset and 10193 * size in both structures. 10194 * Here we check this invariant and use just one of the 10195 * structures if it's true. 10196 */ 10197 BUILD_BUG_ON(offsetof(struct sockaddr_in, sin_port) != 10198 offsetof(struct sockaddr_in6, sin6_port)); 10199 BUILD_BUG_ON(sizeof_field(struct sockaddr_in, sin_port) != 10200 sizeof_field(struct sockaddr_in6, sin6_port)); 10201 /* Account for sin6_port being smaller than user_port. */ 10202 port_size = min(port_size, BPF_LDST_BYTES(si)); 10203 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10204 struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr, 10205 sin6_port, bytes_to_bpf_size(port_size), 0, tmp_reg); 10206 break; 10207 10208 case offsetof(struct bpf_sock_addr, family): 10209 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 10210 struct sock, sk, sk_family); 10211 break; 10212 10213 case offsetof(struct bpf_sock_addr, type): 10214 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 10215 struct sock, sk, sk_type); 10216 break; 10217 10218 case offsetof(struct bpf_sock_addr, protocol): 10219 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 10220 struct sock, sk, sk_protocol); 10221 break; 10222 10223 case offsetof(struct bpf_sock_addr, msg_src_ip4): 10224 /* Treat t_ctx as struct in_addr for msg_src_ip4. */ 10225 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10226 struct bpf_sock_addr_kern, struct in_addr, t_ctx, 10227 s_addr, BPF_SIZE(si->code), 0, tmp_reg); 10228 break; 10229 10230 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 10231 msg_src_ip6[3]): 10232 off = si->off; 10233 off -= offsetof(struct bpf_sock_addr, msg_src_ip6[0]); 10234 /* Treat t_ctx as struct in6_addr for msg_src_ip6. */ 10235 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10236 struct bpf_sock_addr_kern, struct in6_addr, t_ctx, 10237 s6_addr32[0], BPF_SIZE(si->code), off, tmp_reg); 10238 break; 10239 case offsetof(struct bpf_sock_addr, sk): 10240 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_addr_kern, sk), 10241 si->dst_reg, si->src_reg, 10242 offsetof(struct bpf_sock_addr_kern, sk)); 10243 break; 10244 } 10245 10246 return insn - insn_buf; 10247 } 10248 10249 static u32 sock_ops_convert_ctx_access(enum bpf_access_type type, 10250 const struct bpf_insn *si, 10251 struct bpf_insn *insn_buf, 10252 struct bpf_prog *prog, 10253 u32 *target_size) 10254 { 10255 struct bpf_insn *insn = insn_buf; 10256 int off; 10257 10258 /* Helper macro for adding read access to tcp_sock or sock fields. */ 10259 #define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ 10260 do { \ 10261 int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 2; \ 10262 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \ 10263 sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \ 10264 if (si->dst_reg == reg || si->src_reg == reg) \ 10265 reg--; \ 10266 if (si->dst_reg == reg || si->src_reg == reg) \ 10267 reg--; \ 10268 if (si->dst_reg == si->src_reg) { \ 10269 *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, \ 10270 offsetof(struct bpf_sock_ops_kern, \ 10271 temp)); \ 10272 fullsock_reg = reg; \ 10273 jmp += 2; \ 10274 } \ 10275 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10276 struct bpf_sock_ops_kern, \ 10277 is_fullsock), \ 10278 fullsock_reg, si->src_reg, \ 10279 offsetof(struct bpf_sock_ops_kern, \ 10280 is_fullsock)); \ 10281 *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp); \ 10282 if (si->dst_reg == si->src_reg) \ 10283 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 10284 offsetof(struct bpf_sock_ops_kern, \ 10285 temp)); \ 10286 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10287 struct bpf_sock_ops_kern, sk),\ 10288 si->dst_reg, si->src_reg, \ 10289 offsetof(struct bpf_sock_ops_kern, sk));\ 10290 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ, \ 10291 OBJ_FIELD), \ 10292 si->dst_reg, si->dst_reg, \ 10293 offsetof(OBJ, OBJ_FIELD)); \ 10294 if (si->dst_reg == si->src_reg) { \ 10295 *insn++ = BPF_JMP_A(1); \ 10296 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 10297 offsetof(struct bpf_sock_ops_kern, \ 10298 temp)); \ 10299 } \ 10300 } while (0) 10301 10302 #define SOCK_OPS_GET_SK() \ 10303 do { \ 10304 int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 1; \ 10305 if (si->dst_reg == reg || si->src_reg == reg) \ 10306 reg--; \ 10307 if (si->dst_reg == reg || si->src_reg == reg) \ 10308 reg--; \ 10309 if (si->dst_reg == si->src_reg) { \ 10310 *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, \ 10311 offsetof(struct bpf_sock_ops_kern, \ 10312 temp)); \ 10313 fullsock_reg = reg; \ 10314 jmp += 2; \ 10315 } \ 10316 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10317 struct bpf_sock_ops_kern, \ 10318 is_fullsock), \ 10319 fullsock_reg, si->src_reg, \ 10320 offsetof(struct bpf_sock_ops_kern, \ 10321 is_fullsock)); \ 10322 *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp); \ 10323 if (si->dst_reg == si->src_reg) \ 10324 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 10325 offsetof(struct bpf_sock_ops_kern, \ 10326 temp)); \ 10327 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10328 struct bpf_sock_ops_kern, sk),\ 10329 si->dst_reg, si->src_reg, \ 10330 offsetof(struct bpf_sock_ops_kern, sk));\ 10331 if (si->dst_reg == si->src_reg) { \ 10332 *insn++ = BPF_JMP_A(1); \ 10333 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 10334 offsetof(struct bpf_sock_ops_kern, \ 10335 temp)); \ 10336 } \ 10337 } while (0) 10338 10339 #define SOCK_OPS_GET_TCP_SOCK_FIELD(FIELD) \ 10340 SOCK_OPS_GET_FIELD(FIELD, FIELD, struct tcp_sock) 10341 10342 /* Helper macro for adding write access to tcp_sock or sock fields. 10343 * The macro is called with two registers, dst_reg which contains a pointer 10344 * to ctx (context) and src_reg which contains the value that should be 10345 * stored. However, we need an additional register since we cannot overwrite 10346 * dst_reg because it may be used later in the program. 10347 * Instead we "borrow" one of the other register. We first save its value 10348 * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore 10349 * it at the end of the macro. 10350 */ 10351 #define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ 10352 do { \ 10353 int reg = BPF_REG_9; \ 10354 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \ 10355 sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \ 10356 if (si->dst_reg == reg || si->src_reg == reg) \ 10357 reg--; \ 10358 if (si->dst_reg == reg || si->src_reg == reg) \ 10359 reg--; \ 10360 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg, \ 10361 offsetof(struct bpf_sock_ops_kern, \ 10362 temp)); \ 10363 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10364 struct bpf_sock_ops_kern, \ 10365 is_fullsock), \ 10366 reg, si->dst_reg, \ 10367 offsetof(struct bpf_sock_ops_kern, \ 10368 is_fullsock)); \ 10369 *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2); \ 10370 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10371 struct bpf_sock_ops_kern, sk),\ 10372 reg, si->dst_reg, \ 10373 offsetof(struct bpf_sock_ops_kern, sk));\ 10374 *insn++ = BPF_RAW_INSN(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD) | \ 10375 BPF_MEM | BPF_CLASS(si->code), \ 10376 reg, si->src_reg, \ 10377 offsetof(OBJ, OBJ_FIELD), \ 10378 si->imm); \ 10379 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg, \ 10380 offsetof(struct bpf_sock_ops_kern, \ 10381 temp)); \ 10382 } while (0) 10383 10384 #define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE) \ 10385 do { \ 10386 if (TYPE == BPF_WRITE) \ 10387 SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ 10388 else \ 10389 SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ 10390 } while (0) 10391 10392 switch (si->off) { 10393 case offsetof(struct bpf_sock_ops, op): 10394 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10395 op), 10396 si->dst_reg, si->src_reg, 10397 offsetof(struct bpf_sock_ops_kern, op)); 10398 break; 10399 10400 case offsetof(struct bpf_sock_ops, replylong[0]) ... 10401 offsetof(struct bpf_sock_ops, replylong[3]): 10402 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, reply) != 10403 sizeof_field(struct bpf_sock_ops_kern, reply)); 10404 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, replylong) != 10405 sizeof_field(struct bpf_sock_ops_kern, replylong)); 10406 off = si->off; 10407 off -= offsetof(struct bpf_sock_ops, replylong[0]); 10408 off += offsetof(struct bpf_sock_ops_kern, replylong[0]); 10409 if (type == BPF_WRITE) 10410 *insn++ = BPF_EMIT_STORE(BPF_W, si, off); 10411 else 10412 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 10413 off); 10414 break; 10415 10416 case offsetof(struct bpf_sock_ops, family): 10417 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); 10418 10419 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10420 struct bpf_sock_ops_kern, sk), 10421 si->dst_reg, si->src_reg, 10422 offsetof(struct bpf_sock_ops_kern, sk)); 10423 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10424 offsetof(struct sock_common, skc_family)); 10425 break; 10426 10427 case offsetof(struct bpf_sock_ops, remote_ip4): 10428 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); 10429 10430 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10431 struct bpf_sock_ops_kern, sk), 10432 si->dst_reg, si->src_reg, 10433 offsetof(struct bpf_sock_ops_kern, sk)); 10434 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10435 offsetof(struct sock_common, skc_daddr)); 10436 break; 10437 10438 case offsetof(struct bpf_sock_ops, local_ip4): 10439 BUILD_BUG_ON(sizeof_field(struct sock_common, 10440 skc_rcv_saddr) != 4); 10441 10442 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10443 struct bpf_sock_ops_kern, sk), 10444 si->dst_reg, si->src_reg, 10445 offsetof(struct bpf_sock_ops_kern, sk)); 10446 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10447 offsetof(struct sock_common, 10448 skc_rcv_saddr)); 10449 break; 10450 10451 case offsetof(struct bpf_sock_ops, remote_ip6[0]) ... 10452 offsetof(struct bpf_sock_ops, remote_ip6[3]): 10453 #if IS_ENABLED(CONFIG_IPV6) 10454 BUILD_BUG_ON(sizeof_field(struct sock_common, 10455 skc_v6_daddr.s6_addr32[0]) != 4); 10456 10457 off = si->off; 10458 off -= offsetof(struct bpf_sock_ops, remote_ip6[0]); 10459 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10460 struct bpf_sock_ops_kern, sk), 10461 si->dst_reg, si->src_reg, 10462 offsetof(struct bpf_sock_ops_kern, sk)); 10463 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10464 offsetof(struct sock_common, 10465 skc_v6_daddr.s6_addr32[0]) + 10466 off); 10467 #else 10468 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 10469 #endif 10470 break; 10471 10472 case offsetof(struct bpf_sock_ops, local_ip6[0]) ... 10473 offsetof(struct bpf_sock_ops, local_ip6[3]): 10474 #if IS_ENABLED(CONFIG_IPV6) 10475 BUILD_BUG_ON(sizeof_field(struct sock_common, 10476 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 10477 10478 off = si->off; 10479 off -= offsetof(struct bpf_sock_ops, local_ip6[0]); 10480 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10481 struct bpf_sock_ops_kern, sk), 10482 si->dst_reg, si->src_reg, 10483 offsetof(struct bpf_sock_ops_kern, sk)); 10484 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10485 offsetof(struct sock_common, 10486 skc_v6_rcv_saddr.s6_addr32[0]) + 10487 off); 10488 #else 10489 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 10490 #endif 10491 break; 10492 10493 case offsetof(struct bpf_sock_ops, remote_port): 10494 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); 10495 10496 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10497 struct bpf_sock_ops_kern, sk), 10498 si->dst_reg, si->src_reg, 10499 offsetof(struct bpf_sock_ops_kern, sk)); 10500 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10501 offsetof(struct sock_common, skc_dport)); 10502 #ifndef __BIG_ENDIAN_BITFIELD 10503 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 10504 #endif 10505 break; 10506 10507 case offsetof(struct bpf_sock_ops, local_port): 10508 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); 10509 10510 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10511 struct bpf_sock_ops_kern, sk), 10512 si->dst_reg, si->src_reg, 10513 offsetof(struct bpf_sock_ops_kern, sk)); 10514 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10515 offsetof(struct sock_common, skc_num)); 10516 break; 10517 10518 case offsetof(struct bpf_sock_ops, is_fullsock): 10519 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10520 struct bpf_sock_ops_kern, 10521 is_fullsock), 10522 si->dst_reg, si->src_reg, 10523 offsetof(struct bpf_sock_ops_kern, 10524 is_fullsock)); 10525 break; 10526 10527 case offsetof(struct bpf_sock_ops, state): 10528 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_state) != 1); 10529 10530 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10531 struct bpf_sock_ops_kern, sk), 10532 si->dst_reg, si->src_reg, 10533 offsetof(struct bpf_sock_ops_kern, sk)); 10534 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg, 10535 offsetof(struct sock_common, skc_state)); 10536 break; 10537 10538 case offsetof(struct bpf_sock_ops, rtt_min): 10539 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) != 10540 sizeof(struct minmax)); 10541 BUILD_BUG_ON(sizeof(struct minmax) < 10542 sizeof(struct minmax_sample)); 10543 10544 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10545 struct bpf_sock_ops_kern, sk), 10546 si->dst_reg, si->src_reg, 10547 offsetof(struct bpf_sock_ops_kern, sk)); 10548 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10549 offsetof(struct tcp_sock, rtt_min) + 10550 sizeof_field(struct minmax_sample, t)); 10551 break; 10552 10553 case offsetof(struct bpf_sock_ops, bpf_sock_ops_cb_flags): 10554 SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags, 10555 struct tcp_sock); 10556 break; 10557 10558 case offsetof(struct bpf_sock_ops, sk_txhash): 10559 SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash, 10560 struct sock, type); 10561 break; 10562 case offsetof(struct bpf_sock_ops, snd_cwnd): 10563 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_cwnd); 10564 break; 10565 case offsetof(struct bpf_sock_ops, srtt_us): 10566 SOCK_OPS_GET_TCP_SOCK_FIELD(srtt_us); 10567 break; 10568 case offsetof(struct bpf_sock_ops, snd_ssthresh): 10569 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_ssthresh); 10570 break; 10571 case offsetof(struct bpf_sock_ops, rcv_nxt): 10572 SOCK_OPS_GET_TCP_SOCK_FIELD(rcv_nxt); 10573 break; 10574 case offsetof(struct bpf_sock_ops, snd_nxt): 10575 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_nxt); 10576 break; 10577 case offsetof(struct bpf_sock_ops, snd_una): 10578 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_una); 10579 break; 10580 case offsetof(struct bpf_sock_ops, mss_cache): 10581 SOCK_OPS_GET_TCP_SOCK_FIELD(mss_cache); 10582 break; 10583 case offsetof(struct bpf_sock_ops, ecn_flags): 10584 SOCK_OPS_GET_TCP_SOCK_FIELD(ecn_flags); 10585 break; 10586 case offsetof(struct bpf_sock_ops, rate_delivered): 10587 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_delivered); 10588 break; 10589 case offsetof(struct bpf_sock_ops, rate_interval_us): 10590 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_interval_us); 10591 break; 10592 case offsetof(struct bpf_sock_ops, packets_out): 10593 SOCK_OPS_GET_TCP_SOCK_FIELD(packets_out); 10594 break; 10595 case offsetof(struct bpf_sock_ops, retrans_out): 10596 SOCK_OPS_GET_TCP_SOCK_FIELD(retrans_out); 10597 break; 10598 case offsetof(struct bpf_sock_ops, total_retrans): 10599 SOCK_OPS_GET_TCP_SOCK_FIELD(total_retrans); 10600 break; 10601 case offsetof(struct bpf_sock_ops, segs_in): 10602 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_in); 10603 break; 10604 case offsetof(struct bpf_sock_ops, data_segs_in): 10605 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_in); 10606 break; 10607 case offsetof(struct bpf_sock_ops, segs_out): 10608 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_out); 10609 break; 10610 case offsetof(struct bpf_sock_ops, data_segs_out): 10611 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_out); 10612 break; 10613 case offsetof(struct bpf_sock_ops, lost_out): 10614 SOCK_OPS_GET_TCP_SOCK_FIELD(lost_out); 10615 break; 10616 case offsetof(struct bpf_sock_ops, sacked_out): 10617 SOCK_OPS_GET_TCP_SOCK_FIELD(sacked_out); 10618 break; 10619 case offsetof(struct bpf_sock_ops, bytes_received): 10620 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_received); 10621 break; 10622 case offsetof(struct bpf_sock_ops, bytes_acked): 10623 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_acked); 10624 break; 10625 case offsetof(struct bpf_sock_ops, sk): 10626 SOCK_OPS_GET_SK(); 10627 break; 10628 case offsetof(struct bpf_sock_ops, skb_data_end): 10629 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10630 skb_data_end), 10631 si->dst_reg, si->src_reg, 10632 offsetof(struct bpf_sock_ops_kern, 10633 skb_data_end)); 10634 break; 10635 case offsetof(struct bpf_sock_ops, skb_data): 10636 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10637 skb), 10638 si->dst_reg, si->src_reg, 10639 offsetof(struct bpf_sock_ops_kern, 10640 skb)); 10641 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 10642 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 10643 si->dst_reg, si->dst_reg, 10644 offsetof(struct sk_buff, data)); 10645 break; 10646 case offsetof(struct bpf_sock_ops, skb_len): 10647 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10648 skb), 10649 si->dst_reg, si->src_reg, 10650 offsetof(struct bpf_sock_ops_kern, 10651 skb)); 10652 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 10653 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, len), 10654 si->dst_reg, si->dst_reg, 10655 offsetof(struct sk_buff, len)); 10656 break; 10657 case offsetof(struct bpf_sock_ops, skb_tcp_flags): 10658 off = offsetof(struct sk_buff, cb); 10659 off += offsetof(struct tcp_skb_cb, tcp_flags); 10660 *target_size = sizeof_field(struct tcp_skb_cb, tcp_flags); 10661 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10662 skb), 10663 si->dst_reg, si->src_reg, 10664 offsetof(struct bpf_sock_ops_kern, 10665 skb)); 10666 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 10667 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_skb_cb, 10668 tcp_flags), 10669 si->dst_reg, si->dst_reg, off); 10670 break; 10671 case offsetof(struct bpf_sock_ops, skb_hwtstamp): { 10672 struct bpf_insn *jmp_on_null_skb; 10673 10674 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10675 skb), 10676 si->dst_reg, si->src_reg, 10677 offsetof(struct bpf_sock_ops_kern, 10678 skb)); 10679 /* Reserve one insn to test skb == NULL */ 10680 jmp_on_null_skb = insn++; 10681 insn = bpf_convert_shinfo_access(si->dst_reg, si->dst_reg, insn); 10682 *insn++ = BPF_LDX_MEM(BPF_DW, si->dst_reg, si->dst_reg, 10683 bpf_target_off(struct skb_shared_info, 10684 hwtstamps, 8, 10685 target_size)); 10686 *jmp_on_null_skb = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 10687 insn - jmp_on_null_skb - 1); 10688 break; 10689 } 10690 } 10691 return insn - insn_buf; 10692 } 10693 10694 /* data_end = skb->data + skb_headlen() */ 10695 static struct bpf_insn *bpf_convert_data_end_access(const struct bpf_insn *si, 10696 struct bpf_insn *insn) 10697 { 10698 int reg; 10699 int temp_reg_off = offsetof(struct sk_buff, cb) + 10700 offsetof(struct sk_skb_cb, temp_reg); 10701 10702 if (si->src_reg == si->dst_reg) { 10703 /* We need an extra register, choose and save a register. */ 10704 reg = BPF_REG_9; 10705 if (si->src_reg == reg || si->dst_reg == reg) 10706 reg--; 10707 if (si->src_reg == reg || si->dst_reg == reg) 10708 reg--; 10709 *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, temp_reg_off); 10710 } else { 10711 reg = si->dst_reg; 10712 } 10713 10714 /* reg = skb->data */ 10715 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 10716 reg, si->src_reg, 10717 offsetof(struct sk_buff, data)); 10718 /* AX = skb->len */ 10719 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, len), 10720 BPF_REG_AX, si->src_reg, 10721 offsetof(struct sk_buff, len)); 10722 /* reg = skb->data + skb->len */ 10723 *insn++ = BPF_ALU64_REG(BPF_ADD, reg, BPF_REG_AX); 10724 /* AX = skb->data_len */ 10725 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data_len), 10726 BPF_REG_AX, si->src_reg, 10727 offsetof(struct sk_buff, data_len)); 10728 10729 /* reg = skb->data + skb->len - skb->data_len */ 10730 *insn++ = BPF_ALU64_REG(BPF_SUB, reg, BPF_REG_AX); 10731 10732 if (si->src_reg == si->dst_reg) { 10733 /* Restore the saved register */ 10734 *insn++ = BPF_MOV64_REG(BPF_REG_AX, si->src_reg); 10735 *insn++ = BPF_MOV64_REG(si->dst_reg, reg); 10736 *insn++ = BPF_LDX_MEM(BPF_DW, reg, BPF_REG_AX, temp_reg_off); 10737 } 10738 10739 return insn; 10740 } 10741 10742 static u32 sk_skb_convert_ctx_access(enum bpf_access_type type, 10743 const struct bpf_insn *si, 10744 struct bpf_insn *insn_buf, 10745 struct bpf_prog *prog, u32 *target_size) 10746 { 10747 struct bpf_insn *insn = insn_buf; 10748 int off; 10749 10750 switch (si->off) { 10751 case offsetof(struct __sk_buff, data_end): 10752 insn = bpf_convert_data_end_access(si, insn); 10753 break; 10754 case offsetof(struct __sk_buff, cb[0]) ... 10755 offsetofend(struct __sk_buff, cb[4]) - 1: 10756 BUILD_BUG_ON(sizeof_field(struct sk_skb_cb, data) < 20); 10757 BUILD_BUG_ON((offsetof(struct sk_buff, cb) + 10758 offsetof(struct sk_skb_cb, data)) % 10759 sizeof(__u64)); 10760 10761 prog->cb_access = 1; 10762 off = si->off; 10763 off -= offsetof(struct __sk_buff, cb[0]); 10764 off += offsetof(struct sk_buff, cb); 10765 off += offsetof(struct sk_skb_cb, data); 10766 if (type == BPF_WRITE) 10767 *insn++ = BPF_EMIT_STORE(BPF_SIZE(si->code), si, off); 10768 else 10769 *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg, 10770 si->src_reg, off); 10771 break; 10772 10773 10774 default: 10775 return bpf_convert_ctx_access(type, si, insn_buf, prog, 10776 target_size); 10777 } 10778 10779 return insn - insn_buf; 10780 } 10781 10782 static u32 sk_msg_convert_ctx_access(enum bpf_access_type type, 10783 const struct bpf_insn *si, 10784 struct bpf_insn *insn_buf, 10785 struct bpf_prog *prog, u32 *target_size) 10786 { 10787 struct bpf_insn *insn = insn_buf; 10788 #if IS_ENABLED(CONFIG_IPV6) 10789 int off; 10790 #endif 10791 10792 /* convert ctx uses the fact sg element is first in struct */ 10793 BUILD_BUG_ON(offsetof(struct sk_msg, sg) != 0); 10794 10795 switch (si->off) { 10796 case offsetof(struct sk_msg_md, data): 10797 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data), 10798 si->dst_reg, si->src_reg, 10799 offsetof(struct sk_msg, data)); 10800 break; 10801 case offsetof(struct sk_msg_md, data_end): 10802 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data_end), 10803 si->dst_reg, si->src_reg, 10804 offsetof(struct sk_msg, data_end)); 10805 break; 10806 case offsetof(struct sk_msg_md, family): 10807 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); 10808 10809 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10810 struct sk_msg, sk), 10811 si->dst_reg, si->src_reg, 10812 offsetof(struct sk_msg, sk)); 10813 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10814 offsetof(struct sock_common, skc_family)); 10815 break; 10816 10817 case offsetof(struct sk_msg_md, remote_ip4): 10818 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); 10819 10820 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10821 struct sk_msg, sk), 10822 si->dst_reg, si->src_reg, 10823 offsetof(struct sk_msg, sk)); 10824 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10825 offsetof(struct sock_common, skc_daddr)); 10826 break; 10827 10828 case offsetof(struct sk_msg_md, local_ip4): 10829 BUILD_BUG_ON(sizeof_field(struct sock_common, 10830 skc_rcv_saddr) != 4); 10831 10832 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10833 struct sk_msg, sk), 10834 si->dst_reg, si->src_reg, 10835 offsetof(struct sk_msg, sk)); 10836 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10837 offsetof(struct sock_common, 10838 skc_rcv_saddr)); 10839 break; 10840 10841 case offsetof(struct sk_msg_md, remote_ip6[0]) ... 10842 offsetof(struct sk_msg_md, remote_ip6[3]): 10843 #if IS_ENABLED(CONFIG_IPV6) 10844 BUILD_BUG_ON(sizeof_field(struct sock_common, 10845 skc_v6_daddr.s6_addr32[0]) != 4); 10846 10847 off = si->off; 10848 off -= offsetof(struct sk_msg_md, remote_ip6[0]); 10849 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10850 struct sk_msg, sk), 10851 si->dst_reg, si->src_reg, 10852 offsetof(struct sk_msg, sk)); 10853 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10854 offsetof(struct sock_common, 10855 skc_v6_daddr.s6_addr32[0]) + 10856 off); 10857 #else 10858 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 10859 #endif 10860 break; 10861 10862 case offsetof(struct sk_msg_md, local_ip6[0]) ... 10863 offsetof(struct sk_msg_md, local_ip6[3]): 10864 #if IS_ENABLED(CONFIG_IPV6) 10865 BUILD_BUG_ON(sizeof_field(struct sock_common, 10866 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 10867 10868 off = si->off; 10869 off -= offsetof(struct sk_msg_md, local_ip6[0]); 10870 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10871 struct sk_msg, sk), 10872 si->dst_reg, si->src_reg, 10873 offsetof(struct sk_msg, sk)); 10874 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10875 offsetof(struct sock_common, 10876 skc_v6_rcv_saddr.s6_addr32[0]) + 10877 off); 10878 #else 10879 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 10880 #endif 10881 break; 10882 10883 case offsetof(struct sk_msg_md, remote_port): 10884 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); 10885 10886 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10887 struct sk_msg, sk), 10888 si->dst_reg, si->src_reg, 10889 offsetof(struct sk_msg, sk)); 10890 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10891 offsetof(struct sock_common, skc_dport)); 10892 #ifndef __BIG_ENDIAN_BITFIELD 10893 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 10894 #endif 10895 break; 10896 10897 case offsetof(struct sk_msg_md, local_port): 10898 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); 10899 10900 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10901 struct sk_msg, sk), 10902 si->dst_reg, si->src_reg, 10903 offsetof(struct sk_msg, sk)); 10904 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10905 offsetof(struct sock_common, skc_num)); 10906 break; 10907 10908 case offsetof(struct sk_msg_md, size): 10909 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_sg, size), 10910 si->dst_reg, si->src_reg, 10911 offsetof(struct sk_msg_sg, size)); 10912 break; 10913 10914 case offsetof(struct sk_msg_md, sk): 10915 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, sk), 10916 si->dst_reg, si->src_reg, 10917 offsetof(struct sk_msg, sk)); 10918 break; 10919 } 10920 10921 return insn - insn_buf; 10922 } 10923 10924 const struct bpf_verifier_ops sk_filter_verifier_ops = { 10925 .get_func_proto = sk_filter_func_proto, 10926 .is_valid_access = sk_filter_is_valid_access, 10927 .convert_ctx_access = bpf_convert_ctx_access, 10928 .gen_ld_abs = bpf_gen_ld_abs, 10929 }; 10930 10931 const struct bpf_prog_ops sk_filter_prog_ops = { 10932 .test_run = bpf_prog_test_run_skb, 10933 }; 10934 10935 const struct bpf_verifier_ops tc_cls_act_verifier_ops = { 10936 .get_func_proto = tc_cls_act_func_proto, 10937 .is_valid_access = tc_cls_act_is_valid_access, 10938 .convert_ctx_access = tc_cls_act_convert_ctx_access, 10939 .gen_prologue = tc_cls_act_prologue, 10940 .gen_ld_abs = bpf_gen_ld_abs, 10941 .btf_struct_access = tc_cls_act_btf_struct_access, 10942 }; 10943 10944 const struct bpf_prog_ops tc_cls_act_prog_ops = { 10945 .test_run = bpf_prog_test_run_skb, 10946 }; 10947 10948 const struct bpf_verifier_ops xdp_verifier_ops = { 10949 .get_func_proto = xdp_func_proto, 10950 .is_valid_access = xdp_is_valid_access, 10951 .convert_ctx_access = xdp_convert_ctx_access, 10952 .gen_prologue = bpf_noop_prologue, 10953 .btf_struct_access = xdp_btf_struct_access, 10954 }; 10955 10956 const struct bpf_prog_ops xdp_prog_ops = { 10957 .test_run = bpf_prog_test_run_xdp, 10958 }; 10959 10960 const struct bpf_verifier_ops cg_skb_verifier_ops = { 10961 .get_func_proto = cg_skb_func_proto, 10962 .is_valid_access = cg_skb_is_valid_access, 10963 .convert_ctx_access = bpf_convert_ctx_access, 10964 }; 10965 10966 const struct bpf_prog_ops cg_skb_prog_ops = { 10967 .test_run = bpf_prog_test_run_skb, 10968 }; 10969 10970 const struct bpf_verifier_ops lwt_in_verifier_ops = { 10971 .get_func_proto = lwt_in_func_proto, 10972 .is_valid_access = lwt_is_valid_access, 10973 .convert_ctx_access = bpf_convert_ctx_access, 10974 }; 10975 10976 const struct bpf_prog_ops lwt_in_prog_ops = { 10977 .test_run = bpf_prog_test_run_skb, 10978 }; 10979 10980 const struct bpf_verifier_ops lwt_out_verifier_ops = { 10981 .get_func_proto = lwt_out_func_proto, 10982 .is_valid_access = lwt_is_valid_access, 10983 .convert_ctx_access = bpf_convert_ctx_access, 10984 }; 10985 10986 const struct bpf_prog_ops lwt_out_prog_ops = { 10987 .test_run = bpf_prog_test_run_skb, 10988 }; 10989 10990 const struct bpf_verifier_ops lwt_xmit_verifier_ops = { 10991 .get_func_proto = lwt_xmit_func_proto, 10992 .is_valid_access = lwt_is_valid_access, 10993 .convert_ctx_access = bpf_convert_ctx_access, 10994 .gen_prologue = tc_cls_act_prologue, 10995 }; 10996 10997 const struct bpf_prog_ops lwt_xmit_prog_ops = { 10998 .test_run = bpf_prog_test_run_skb, 10999 }; 11000 11001 const struct bpf_verifier_ops lwt_seg6local_verifier_ops = { 11002 .get_func_proto = lwt_seg6local_func_proto, 11003 .is_valid_access = lwt_is_valid_access, 11004 .convert_ctx_access = bpf_convert_ctx_access, 11005 }; 11006 11007 const struct bpf_prog_ops lwt_seg6local_prog_ops = { 11008 .test_run = bpf_prog_test_run_skb, 11009 }; 11010 11011 const struct bpf_verifier_ops cg_sock_verifier_ops = { 11012 .get_func_proto = sock_filter_func_proto, 11013 .is_valid_access = sock_filter_is_valid_access, 11014 .convert_ctx_access = bpf_sock_convert_ctx_access, 11015 }; 11016 11017 const struct bpf_prog_ops cg_sock_prog_ops = { 11018 }; 11019 11020 const struct bpf_verifier_ops cg_sock_addr_verifier_ops = { 11021 .get_func_proto = sock_addr_func_proto, 11022 .is_valid_access = sock_addr_is_valid_access, 11023 .convert_ctx_access = sock_addr_convert_ctx_access, 11024 }; 11025 11026 const struct bpf_prog_ops cg_sock_addr_prog_ops = { 11027 }; 11028 11029 const struct bpf_verifier_ops sock_ops_verifier_ops = { 11030 .get_func_proto = sock_ops_func_proto, 11031 .is_valid_access = sock_ops_is_valid_access, 11032 .convert_ctx_access = sock_ops_convert_ctx_access, 11033 }; 11034 11035 const struct bpf_prog_ops sock_ops_prog_ops = { 11036 }; 11037 11038 const struct bpf_verifier_ops sk_skb_verifier_ops = { 11039 .get_func_proto = sk_skb_func_proto, 11040 .is_valid_access = sk_skb_is_valid_access, 11041 .convert_ctx_access = sk_skb_convert_ctx_access, 11042 .gen_prologue = sk_skb_prologue, 11043 }; 11044 11045 const struct bpf_prog_ops sk_skb_prog_ops = { 11046 }; 11047 11048 const struct bpf_verifier_ops sk_msg_verifier_ops = { 11049 .get_func_proto = sk_msg_func_proto, 11050 .is_valid_access = sk_msg_is_valid_access, 11051 .convert_ctx_access = sk_msg_convert_ctx_access, 11052 .gen_prologue = bpf_noop_prologue, 11053 }; 11054 11055 const struct bpf_prog_ops sk_msg_prog_ops = { 11056 }; 11057 11058 const struct bpf_verifier_ops flow_dissector_verifier_ops = { 11059 .get_func_proto = flow_dissector_func_proto, 11060 .is_valid_access = flow_dissector_is_valid_access, 11061 .convert_ctx_access = flow_dissector_convert_ctx_access, 11062 }; 11063 11064 const struct bpf_prog_ops flow_dissector_prog_ops = { 11065 .test_run = bpf_prog_test_run_flow_dissector, 11066 }; 11067 11068 int sk_detach_filter(struct sock *sk) 11069 { 11070 int ret = -ENOENT; 11071 struct sk_filter *filter; 11072 11073 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 11074 return -EPERM; 11075 11076 filter = rcu_dereference_protected(sk->sk_filter, 11077 lockdep_sock_is_held(sk)); 11078 if (filter) { 11079 RCU_INIT_POINTER(sk->sk_filter, NULL); 11080 sk_filter_uncharge(sk, filter); 11081 ret = 0; 11082 } 11083 11084 return ret; 11085 } 11086 EXPORT_SYMBOL_GPL(sk_detach_filter); 11087 11088 int sk_get_filter(struct sock *sk, sockptr_t optval, unsigned int len) 11089 { 11090 struct sock_fprog_kern *fprog; 11091 struct sk_filter *filter; 11092 int ret = 0; 11093 11094 sockopt_lock_sock(sk); 11095 filter = rcu_dereference_protected(sk->sk_filter, 11096 lockdep_sock_is_held(sk)); 11097 if (!filter) 11098 goto out; 11099 11100 /* We're copying the filter that has been originally attached, 11101 * so no conversion/decode needed anymore. eBPF programs that 11102 * have no original program cannot be dumped through this. 11103 */ 11104 ret = -EACCES; 11105 fprog = filter->prog->orig_prog; 11106 if (!fprog) 11107 goto out; 11108 11109 ret = fprog->len; 11110 if (!len) 11111 /* User space only enquires number of filter blocks. */ 11112 goto out; 11113 11114 ret = -EINVAL; 11115 if (len < fprog->len) 11116 goto out; 11117 11118 ret = -EFAULT; 11119 if (copy_to_sockptr(optval, fprog->filter, bpf_classic_proglen(fprog))) 11120 goto out; 11121 11122 /* Instead of bytes, the API requests to return the number 11123 * of filter blocks. 11124 */ 11125 ret = fprog->len; 11126 out: 11127 sockopt_release_sock(sk); 11128 return ret; 11129 } 11130 11131 #ifdef CONFIG_INET 11132 static void bpf_init_reuseport_kern(struct sk_reuseport_kern *reuse_kern, 11133 struct sock_reuseport *reuse, 11134 struct sock *sk, struct sk_buff *skb, 11135 struct sock *migrating_sk, 11136 u32 hash) 11137 { 11138 reuse_kern->skb = skb; 11139 reuse_kern->sk = sk; 11140 reuse_kern->selected_sk = NULL; 11141 reuse_kern->migrating_sk = migrating_sk; 11142 reuse_kern->data_end = skb->data + skb_headlen(skb); 11143 reuse_kern->hash = hash; 11144 reuse_kern->reuseport_id = reuse->reuseport_id; 11145 reuse_kern->bind_inany = reuse->bind_inany; 11146 } 11147 11148 struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk, 11149 struct bpf_prog *prog, struct sk_buff *skb, 11150 struct sock *migrating_sk, 11151 u32 hash) 11152 { 11153 struct sk_reuseport_kern reuse_kern; 11154 enum sk_action action; 11155 11156 bpf_init_reuseport_kern(&reuse_kern, reuse, sk, skb, migrating_sk, hash); 11157 action = bpf_prog_run(prog, &reuse_kern); 11158 11159 if (action == SK_PASS) 11160 return reuse_kern.selected_sk; 11161 else 11162 return ERR_PTR(-ECONNREFUSED); 11163 } 11164 11165 BPF_CALL_4(sk_select_reuseport, struct sk_reuseport_kern *, reuse_kern, 11166 struct bpf_map *, map, void *, key, u32, flags) 11167 { 11168 bool is_sockarray = map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY; 11169 struct sock_reuseport *reuse; 11170 struct sock *selected_sk; 11171 11172 selected_sk = map->ops->map_lookup_elem(map, key); 11173 if (!selected_sk) 11174 return -ENOENT; 11175 11176 reuse = rcu_dereference(selected_sk->sk_reuseport_cb); 11177 if (!reuse) { 11178 /* Lookup in sock_map can return TCP ESTABLISHED sockets. */ 11179 if (sk_is_refcounted(selected_sk)) 11180 sock_put(selected_sk); 11181 11182 /* reuseport_array has only sk with non NULL sk_reuseport_cb. 11183 * The only (!reuse) case here is - the sk has already been 11184 * unhashed (e.g. by close()), so treat it as -ENOENT. 11185 * 11186 * Other maps (e.g. sock_map) do not provide this guarantee and 11187 * the sk may never be in the reuseport group to begin with. 11188 */ 11189 return is_sockarray ? -ENOENT : -EINVAL; 11190 } 11191 11192 if (unlikely(reuse->reuseport_id != reuse_kern->reuseport_id)) { 11193 struct sock *sk = reuse_kern->sk; 11194 11195 if (sk->sk_protocol != selected_sk->sk_protocol) 11196 return -EPROTOTYPE; 11197 else if (sk->sk_family != selected_sk->sk_family) 11198 return -EAFNOSUPPORT; 11199 11200 /* Catch all. Likely bound to a different sockaddr. */ 11201 return -EBADFD; 11202 } 11203 11204 reuse_kern->selected_sk = selected_sk; 11205 11206 return 0; 11207 } 11208 11209 static const struct bpf_func_proto sk_select_reuseport_proto = { 11210 .func = sk_select_reuseport, 11211 .gpl_only = false, 11212 .ret_type = RET_INTEGER, 11213 .arg1_type = ARG_PTR_TO_CTX, 11214 .arg2_type = ARG_CONST_MAP_PTR, 11215 .arg3_type = ARG_PTR_TO_MAP_KEY, 11216 .arg4_type = ARG_ANYTHING, 11217 }; 11218 11219 BPF_CALL_4(sk_reuseport_load_bytes, 11220 const struct sk_reuseport_kern *, reuse_kern, u32, offset, 11221 void *, to, u32, len) 11222 { 11223 return ____bpf_skb_load_bytes(reuse_kern->skb, offset, to, len); 11224 } 11225 11226 static const struct bpf_func_proto sk_reuseport_load_bytes_proto = { 11227 .func = sk_reuseport_load_bytes, 11228 .gpl_only = false, 11229 .ret_type = RET_INTEGER, 11230 .arg1_type = ARG_PTR_TO_CTX, 11231 .arg2_type = ARG_ANYTHING, 11232 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 11233 .arg4_type = ARG_CONST_SIZE, 11234 }; 11235 11236 BPF_CALL_5(sk_reuseport_load_bytes_relative, 11237 const struct sk_reuseport_kern *, reuse_kern, u32, offset, 11238 void *, to, u32, len, u32, start_header) 11239 { 11240 return ____bpf_skb_load_bytes_relative(reuse_kern->skb, offset, to, 11241 len, start_header); 11242 } 11243 11244 static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto = { 11245 .func = sk_reuseport_load_bytes_relative, 11246 .gpl_only = false, 11247 .ret_type = RET_INTEGER, 11248 .arg1_type = ARG_PTR_TO_CTX, 11249 .arg2_type = ARG_ANYTHING, 11250 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 11251 .arg4_type = ARG_CONST_SIZE, 11252 .arg5_type = ARG_ANYTHING, 11253 }; 11254 11255 static const struct bpf_func_proto * 11256 sk_reuseport_func_proto(enum bpf_func_id func_id, 11257 const struct bpf_prog *prog) 11258 { 11259 switch (func_id) { 11260 case BPF_FUNC_sk_select_reuseport: 11261 return &sk_select_reuseport_proto; 11262 case BPF_FUNC_skb_load_bytes: 11263 return &sk_reuseport_load_bytes_proto; 11264 case BPF_FUNC_skb_load_bytes_relative: 11265 return &sk_reuseport_load_bytes_relative_proto; 11266 case BPF_FUNC_get_socket_cookie: 11267 return &bpf_get_socket_ptr_cookie_proto; 11268 case BPF_FUNC_ktime_get_coarse_ns: 11269 return &bpf_ktime_get_coarse_ns_proto; 11270 default: 11271 return bpf_base_func_proto(func_id); 11272 } 11273 } 11274 11275 static bool 11276 sk_reuseport_is_valid_access(int off, int size, 11277 enum bpf_access_type type, 11278 const struct bpf_prog *prog, 11279 struct bpf_insn_access_aux *info) 11280 { 11281 const u32 size_default = sizeof(__u32); 11282 11283 if (off < 0 || off >= sizeof(struct sk_reuseport_md) || 11284 off % size || type != BPF_READ) 11285 return false; 11286 11287 switch (off) { 11288 case offsetof(struct sk_reuseport_md, data): 11289 info->reg_type = PTR_TO_PACKET; 11290 return size == sizeof(__u64); 11291 11292 case offsetof(struct sk_reuseport_md, data_end): 11293 info->reg_type = PTR_TO_PACKET_END; 11294 return size == sizeof(__u64); 11295 11296 case offsetof(struct sk_reuseport_md, hash): 11297 return size == size_default; 11298 11299 case offsetof(struct sk_reuseport_md, sk): 11300 info->reg_type = PTR_TO_SOCKET; 11301 return size == sizeof(__u64); 11302 11303 case offsetof(struct sk_reuseport_md, migrating_sk): 11304 info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL; 11305 return size == sizeof(__u64); 11306 11307 /* Fields that allow narrowing */ 11308 case bpf_ctx_range(struct sk_reuseport_md, eth_protocol): 11309 if (size < sizeof_field(struct sk_buff, protocol)) 11310 return false; 11311 fallthrough; 11312 case bpf_ctx_range(struct sk_reuseport_md, ip_protocol): 11313 case bpf_ctx_range(struct sk_reuseport_md, bind_inany): 11314 case bpf_ctx_range(struct sk_reuseport_md, len): 11315 bpf_ctx_record_field_size(info, size_default); 11316 return bpf_ctx_narrow_access_ok(off, size, size_default); 11317 11318 default: 11319 return false; 11320 } 11321 } 11322 11323 #define SK_REUSEPORT_LOAD_FIELD(F) ({ \ 11324 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \ 11325 si->dst_reg, si->src_reg, \ 11326 bpf_target_off(struct sk_reuseport_kern, F, \ 11327 sizeof_field(struct sk_reuseport_kern, F), \ 11328 target_size)); \ 11329 }) 11330 11331 #define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD) \ 11332 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \ 11333 struct sk_buff, \ 11334 skb, \ 11335 SKB_FIELD) 11336 11337 #define SK_REUSEPORT_LOAD_SK_FIELD(SK_FIELD) \ 11338 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \ 11339 struct sock, \ 11340 sk, \ 11341 SK_FIELD) 11342 11343 static u32 sk_reuseport_convert_ctx_access(enum bpf_access_type type, 11344 const struct bpf_insn *si, 11345 struct bpf_insn *insn_buf, 11346 struct bpf_prog *prog, 11347 u32 *target_size) 11348 { 11349 struct bpf_insn *insn = insn_buf; 11350 11351 switch (si->off) { 11352 case offsetof(struct sk_reuseport_md, data): 11353 SK_REUSEPORT_LOAD_SKB_FIELD(data); 11354 break; 11355 11356 case offsetof(struct sk_reuseport_md, len): 11357 SK_REUSEPORT_LOAD_SKB_FIELD(len); 11358 break; 11359 11360 case offsetof(struct sk_reuseport_md, eth_protocol): 11361 SK_REUSEPORT_LOAD_SKB_FIELD(protocol); 11362 break; 11363 11364 case offsetof(struct sk_reuseport_md, ip_protocol): 11365 SK_REUSEPORT_LOAD_SK_FIELD(sk_protocol); 11366 break; 11367 11368 case offsetof(struct sk_reuseport_md, data_end): 11369 SK_REUSEPORT_LOAD_FIELD(data_end); 11370 break; 11371 11372 case offsetof(struct sk_reuseport_md, hash): 11373 SK_REUSEPORT_LOAD_FIELD(hash); 11374 break; 11375 11376 case offsetof(struct sk_reuseport_md, bind_inany): 11377 SK_REUSEPORT_LOAD_FIELD(bind_inany); 11378 break; 11379 11380 case offsetof(struct sk_reuseport_md, sk): 11381 SK_REUSEPORT_LOAD_FIELD(sk); 11382 break; 11383 11384 case offsetof(struct sk_reuseport_md, migrating_sk): 11385 SK_REUSEPORT_LOAD_FIELD(migrating_sk); 11386 break; 11387 } 11388 11389 return insn - insn_buf; 11390 } 11391 11392 const struct bpf_verifier_ops sk_reuseport_verifier_ops = { 11393 .get_func_proto = sk_reuseport_func_proto, 11394 .is_valid_access = sk_reuseport_is_valid_access, 11395 .convert_ctx_access = sk_reuseport_convert_ctx_access, 11396 }; 11397 11398 const struct bpf_prog_ops sk_reuseport_prog_ops = { 11399 }; 11400 11401 DEFINE_STATIC_KEY_FALSE(bpf_sk_lookup_enabled); 11402 EXPORT_SYMBOL(bpf_sk_lookup_enabled); 11403 11404 BPF_CALL_3(bpf_sk_lookup_assign, struct bpf_sk_lookup_kern *, ctx, 11405 struct sock *, sk, u64, flags) 11406 { 11407 if (unlikely(flags & ~(BPF_SK_LOOKUP_F_REPLACE | 11408 BPF_SK_LOOKUP_F_NO_REUSEPORT))) 11409 return -EINVAL; 11410 if (unlikely(sk && sk_is_refcounted(sk))) 11411 return -ESOCKTNOSUPPORT; /* reject non-RCU freed sockets */ 11412 if (unlikely(sk && sk_is_tcp(sk) && sk->sk_state != TCP_LISTEN)) 11413 return -ESOCKTNOSUPPORT; /* only accept TCP socket in LISTEN */ 11414 if (unlikely(sk && sk_is_udp(sk) && sk->sk_state != TCP_CLOSE)) 11415 return -ESOCKTNOSUPPORT; /* only accept UDP socket in CLOSE */ 11416 11417 /* Check if socket is suitable for packet L3/L4 protocol */ 11418 if (sk && sk->sk_protocol != ctx->protocol) 11419 return -EPROTOTYPE; 11420 if (sk && sk->sk_family != ctx->family && 11421 (sk->sk_family == AF_INET || ipv6_only_sock(sk))) 11422 return -EAFNOSUPPORT; 11423 11424 if (ctx->selected_sk && !(flags & BPF_SK_LOOKUP_F_REPLACE)) 11425 return -EEXIST; 11426 11427 /* Select socket as lookup result */ 11428 ctx->selected_sk = sk; 11429 ctx->no_reuseport = flags & BPF_SK_LOOKUP_F_NO_REUSEPORT; 11430 return 0; 11431 } 11432 11433 static const struct bpf_func_proto bpf_sk_lookup_assign_proto = { 11434 .func = bpf_sk_lookup_assign, 11435 .gpl_only = false, 11436 .ret_type = RET_INTEGER, 11437 .arg1_type = ARG_PTR_TO_CTX, 11438 .arg2_type = ARG_PTR_TO_SOCKET_OR_NULL, 11439 .arg3_type = ARG_ANYTHING, 11440 }; 11441 11442 static const struct bpf_func_proto * 11443 sk_lookup_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 11444 { 11445 switch (func_id) { 11446 case BPF_FUNC_perf_event_output: 11447 return &bpf_event_output_data_proto; 11448 case BPF_FUNC_sk_assign: 11449 return &bpf_sk_lookup_assign_proto; 11450 case BPF_FUNC_sk_release: 11451 return &bpf_sk_release_proto; 11452 default: 11453 return bpf_sk_base_func_proto(func_id); 11454 } 11455 } 11456 11457 static bool sk_lookup_is_valid_access(int off, int size, 11458 enum bpf_access_type type, 11459 const struct bpf_prog *prog, 11460 struct bpf_insn_access_aux *info) 11461 { 11462 if (off < 0 || off >= sizeof(struct bpf_sk_lookup)) 11463 return false; 11464 if (off % size != 0) 11465 return false; 11466 if (type != BPF_READ) 11467 return false; 11468 11469 switch (off) { 11470 case offsetof(struct bpf_sk_lookup, sk): 11471 info->reg_type = PTR_TO_SOCKET_OR_NULL; 11472 return size == sizeof(__u64); 11473 11474 case bpf_ctx_range(struct bpf_sk_lookup, family): 11475 case bpf_ctx_range(struct bpf_sk_lookup, protocol): 11476 case bpf_ctx_range(struct bpf_sk_lookup, remote_ip4): 11477 case bpf_ctx_range(struct bpf_sk_lookup, local_ip4): 11478 case bpf_ctx_range_till(struct bpf_sk_lookup, remote_ip6[0], remote_ip6[3]): 11479 case bpf_ctx_range_till(struct bpf_sk_lookup, local_ip6[0], local_ip6[3]): 11480 case bpf_ctx_range(struct bpf_sk_lookup, local_port): 11481 case bpf_ctx_range(struct bpf_sk_lookup, ingress_ifindex): 11482 bpf_ctx_record_field_size(info, sizeof(__u32)); 11483 return bpf_ctx_narrow_access_ok(off, size, sizeof(__u32)); 11484 11485 case bpf_ctx_range(struct bpf_sk_lookup, remote_port): 11486 /* Allow 4-byte access to 2-byte field for backward compatibility */ 11487 if (size == sizeof(__u32)) 11488 return true; 11489 bpf_ctx_record_field_size(info, sizeof(__be16)); 11490 return bpf_ctx_narrow_access_ok(off, size, sizeof(__be16)); 11491 11492 case offsetofend(struct bpf_sk_lookup, remote_port) ... 11493 offsetof(struct bpf_sk_lookup, local_ip4) - 1: 11494 /* Allow access to zero padding for backward compatibility */ 11495 bpf_ctx_record_field_size(info, sizeof(__u16)); 11496 return bpf_ctx_narrow_access_ok(off, size, sizeof(__u16)); 11497 11498 default: 11499 return false; 11500 } 11501 } 11502 11503 static u32 sk_lookup_convert_ctx_access(enum bpf_access_type type, 11504 const struct bpf_insn *si, 11505 struct bpf_insn *insn_buf, 11506 struct bpf_prog *prog, 11507 u32 *target_size) 11508 { 11509 struct bpf_insn *insn = insn_buf; 11510 11511 switch (si->off) { 11512 case offsetof(struct bpf_sk_lookup, sk): 11513 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg, 11514 offsetof(struct bpf_sk_lookup_kern, selected_sk)); 11515 break; 11516 11517 case offsetof(struct bpf_sk_lookup, family): 11518 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 11519 bpf_target_off(struct bpf_sk_lookup_kern, 11520 family, 2, target_size)); 11521 break; 11522 11523 case offsetof(struct bpf_sk_lookup, protocol): 11524 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 11525 bpf_target_off(struct bpf_sk_lookup_kern, 11526 protocol, 2, target_size)); 11527 break; 11528 11529 case offsetof(struct bpf_sk_lookup, remote_ip4): 11530 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 11531 bpf_target_off(struct bpf_sk_lookup_kern, 11532 v4.saddr, 4, target_size)); 11533 break; 11534 11535 case offsetof(struct bpf_sk_lookup, local_ip4): 11536 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 11537 bpf_target_off(struct bpf_sk_lookup_kern, 11538 v4.daddr, 4, target_size)); 11539 break; 11540 11541 case bpf_ctx_range_till(struct bpf_sk_lookup, 11542 remote_ip6[0], remote_ip6[3]): { 11543 #if IS_ENABLED(CONFIG_IPV6) 11544 int off = si->off; 11545 11546 off -= offsetof(struct bpf_sk_lookup, remote_ip6[0]); 11547 off += bpf_target_off(struct in6_addr, s6_addr32[0], 4, target_size); 11548 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg, 11549 offsetof(struct bpf_sk_lookup_kern, v6.saddr)); 11550 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 11551 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, off); 11552 #else 11553 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 11554 #endif 11555 break; 11556 } 11557 case bpf_ctx_range_till(struct bpf_sk_lookup, 11558 local_ip6[0], local_ip6[3]): { 11559 #if IS_ENABLED(CONFIG_IPV6) 11560 int off = si->off; 11561 11562 off -= offsetof(struct bpf_sk_lookup, local_ip6[0]); 11563 off += bpf_target_off(struct in6_addr, s6_addr32[0], 4, target_size); 11564 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg, 11565 offsetof(struct bpf_sk_lookup_kern, v6.daddr)); 11566 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 11567 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, off); 11568 #else 11569 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 11570 #endif 11571 break; 11572 } 11573 case offsetof(struct bpf_sk_lookup, remote_port): 11574 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 11575 bpf_target_off(struct bpf_sk_lookup_kern, 11576 sport, 2, target_size)); 11577 break; 11578 11579 case offsetofend(struct bpf_sk_lookup, remote_port): 11580 *target_size = 2; 11581 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 11582 break; 11583 11584 case offsetof(struct bpf_sk_lookup, local_port): 11585 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 11586 bpf_target_off(struct bpf_sk_lookup_kern, 11587 dport, 2, target_size)); 11588 break; 11589 11590 case offsetof(struct bpf_sk_lookup, ingress_ifindex): 11591 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 11592 bpf_target_off(struct bpf_sk_lookup_kern, 11593 ingress_ifindex, 4, target_size)); 11594 break; 11595 } 11596 11597 return insn - insn_buf; 11598 } 11599 11600 const struct bpf_prog_ops sk_lookup_prog_ops = { 11601 .test_run = bpf_prog_test_run_sk_lookup, 11602 }; 11603 11604 const struct bpf_verifier_ops sk_lookup_verifier_ops = { 11605 .get_func_proto = sk_lookup_func_proto, 11606 .is_valid_access = sk_lookup_is_valid_access, 11607 .convert_ctx_access = sk_lookup_convert_ctx_access, 11608 }; 11609 11610 #endif /* CONFIG_INET */ 11611 11612 DEFINE_BPF_DISPATCHER(xdp) 11613 11614 void bpf_prog_change_xdp(struct bpf_prog *prev_prog, struct bpf_prog *prog) 11615 { 11616 bpf_dispatcher_change_prog(BPF_DISPATCHER_PTR(xdp), prev_prog, prog); 11617 } 11618 11619 BTF_ID_LIST_GLOBAL(btf_sock_ids, MAX_BTF_SOCK_TYPE) 11620 #define BTF_SOCK_TYPE(name, type) BTF_ID(struct, type) 11621 BTF_SOCK_TYPE_xxx 11622 #undef BTF_SOCK_TYPE 11623 11624 BPF_CALL_1(bpf_skc_to_tcp6_sock, struct sock *, sk) 11625 { 11626 /* tcp6_sock type is not generated in dwarf and hence btf, 11627 * trigger an explicit type generation here. 11628 */ 11629 BTF_TYPE_EMIT(struct tcp6_sock); 11630 if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP && 11631 sk->sk_family == AF_INET6) 11632 return (unsigned long)sk; 11633 11634 return (unsigned long)NULL; 11635 } 11636 11637 const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto = { 11638 .func = bpf_skc_to_tcp6_sock, 11639 .gpl_only = false, 11640 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11641 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11642 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP6], 11643 }; 11644 11645 BPF_CALL_1(bpf_skc_to_tcp_sock, struct sock *, sk) 11646 { 11647 if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP) 11648 return (unsigned long)sk; 11649 11650 return (unsigned long)NULL; 11651 } 11652 11653 const struct bpf_func_proto bpf_skc_to_tcp_sock_proto = { 11654 .func = bpf_skc_to_tcp_sock, 11655 .gpl_only = false, 11656 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11657 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11658 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP], 11659 }; 11660 11661 BPF_CALL_1(bpf_skc_to_tcp_timewait_sock, struct sock *, sk) 11662 { 11663 /* BTF types for tcp_timewait_sock and inet_timewait_sock are not 11664 * generated if CONFIG_INET=n. Trigger an explicit generation here. 11665 */ 11666 BTF_TYPE_EMIT(struct inet_timewait_sock); 11667 BTF_TYPE_EMIT(struct tcp_timewait_sock); 11668 11669 #ifdef CONFIG_INET 11670 if (sk && sk->sk_prot == &tcp_prot && sk->sk_state == TCP_TIME_WAIT) 11671 return (unsigned long)sk; 11672 #endif 11673 11674 #if IS_BUILTIN(CONFIG_IPV6) 11675 if (sk && sk->sk_prot == &tcpv6_prot && sk->sk_state == TCP_TIME_WAIT) 11676 return (unsigned long)sk; 11677 #endif 11678 11679 return (unsigned long)NULL; 11680 } 11681 11682 const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto = { 11683 .func = bpf_skc_to_tcp_timewait_sock, 11684 .gpl_only = false, 11685 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11686 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11687 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP_TW], 11688 }; 11689 11690 BPF_CALL_1(bpf_skc_to_tcp_request_sock, struct sock *, sk) 11691 { 11692 #ifdef CONFIG_INET 11693 if (sk && sk->sk_prot == &tcp_prot && sk->sk_state == TCP_NEW_SYN_RECV) 11694 return (unsigned long)sk; 11695 #endif 11696 11697 #if IS_BUILTIN(CONFIG_IPV6) 11698 if (sk && sk->sk_prot == &tcpv6_prot && sk->sk_state == TCP_NEW_SYN_RECV) 11699 return (unsigned long)sk; 11700 #endif 11701 11702 return (unsigned long)NULL; 11703 } 11704 11705 const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto = { 11706 .func = bpf_skc_to_tcp_request_sock, 11707 .gpl_only = false, 11708 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11709 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11710 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP_REQ], 11711 }; 11712 11713 BPF_CALL_1(bpf_skc_to_udp6_sock, struct sock *, sk) 11714 { 11715 /* udp6_sock type is not generated in dwarf and hence btf, 11716 * trigger an explicit type generation here. 11717 */ 11718 BTF_TYPE_EMIT(struct udp6_sock); 11719 if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_UDP && 11720 sk->sk_type == SOCK_DGRAM && sk->sk_family == AF_INET6) 11721 return (unsigned long)sk; 11722 11723 return (unsigned long)NULL; 11724 } 11725 11726 const struct bpf_func_proto bpf_skc_to_udp6_sock_proto = { 11727 .func = bpf_skc_to_udp6_sock, 11728 .gpl_only = false, 11729 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11730 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11731 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_UDP6], 11732 }; 11733 11734 BPF_CALL_1(bpf_skc_to_unix_sock, struct sock *, sk) 11735 { 11736 /* unix_sock type is not generated in dwarf and hence btf, 11737 * trigger an explicit type generation here. 11738 */ 11739 BTF_TYPE_EMIT(struct unix_sock); 11740 if (sk && sk_fullsock(sk) && sk->sk_family == AF_UNIX) 11741 return (unsigned long)sk; 11742 11743 return (unsigned long)NULL; 11744 } 11745 11746 const struct bpf_func_proto bpf_skc_to_unix_sock_proto = { 11747 .func = bpf_skc_to_unix_sock, 11748 .gpl_only = false, 11749 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11750 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11751 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_UNIX], 11752 }; 11753 11754 BPF_CALL_1(bpf_skc_to_mptcp_sock, struct sock *, sk) 11755 { 11756 BTF_TYPE_EMIT(struct mptcp_sock); 11757 return (unsigned long)bpf_mptcp_sock_from_subflow(sk); 11758 } 11759 11760 const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto = { 11761 .func = bpf_skc_to_mptcp_sock, 11762 .gpl_only = false, 11763 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11764 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 11765 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_MPTCP], 11766 }; 11767 11768 BPF_CALL_1(bpf_sock_from_file, struct file *, file) 11769 { 11770 return (unsigned long)sock_from_file(file); 11771 } 11772 11773 BTF_ID_LIST(bpf_sock_from_file_btf_ids) 11774 BTF_ID(struct, socket) 11775 BTF_ID(struct, file) 11776 11777 const struct bpf_func_proto bpf_sock_from_file_proto = { 11778 .func = bpf_sock_from_file, 11779 .gpl_only = false, 11780 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11781 .ret_btf_id = &bpf_sock_from_file_btf_ids[0], 11782 .arg1_type = ARG_PTR_TO_BTF_ID, 11783 .arg1_btf_id = &bpf_sock_from_file_btf_ids[1], 11784 }; 11785 11786 static const struct bpf_func_proto * 11787 bpf_sk_base_func_proto(enum bpf_func_id func_id) 11788 { 11789 const struct bpf_func_proto *func; 11790 11791 switch (func_id) { 11792 case BPF_FUNC_skc_to_tcp6_sock: 11793 func = &bpf_skc_to_tcp6_sock_proto; 11794 break; 11795 case BPF_FUNC_skc_to_tcp_sock: 11796 func = &bpf_skc_to_tcp_sock_proto; 11797 break; 11798 case BPF_FUNC_skc_to_tcp_timewait_sock: 11799 func = &bpf_skc_to_tcp_timewait_sock_proto; 11800 break; 11801 case BPF_FUNC_skc_to_tcp_request_sock: 11802 func = &bpf_skc_to_tcp_request_sock_proto; 11803 break; 11804 case BPF_FUNC_skc_to_udp6_sock: 11805 func = &bpf_skc_to_udp6_sock_proto; 11806 break; 11807 case BPF_FUNC_skc_to_unix_sock: 11808 func = &bpf_skc_to_unix_sock_proto; 11809 break; 11810 case BPF_FUNC_skc_to_mptcp_sock: 11811 func = &bpf_skc_to_mptcp_sock_proto; 11812 break; 11813 case BPF_FUNC_ktime_get_coarse_ns: 11814 return &bpf_ktime_get_coarse_ns_proto; 11815 default: 11816 return bpf_base_func_proto(func_id); 11817 } 11818 11819 if (!perfmon_capable()) 11820 return NULL; 11821 11822 return func; 11823 } 11824 11825 __bpf_kfunc_start_defs(); 11826 __bpf_kfunc int bpf_dynptr_from_skb(struct sk_buff *skb, u64 flags, 11827 struct bpf_dynptr_kern *ptr__uninit) 11828 { 11829 if (flags) { 11830 bpf_dynptr_set_null(ptr__uninit); 11831 return -EINVAL; 11832 } 11833 11834 bpf_dynptr_init(ptr__uninit, skb, BPF_DYNPTR_TYPE_SKB, 0, skb->len); 11835 11836 return 0; 11837 } 11838 11839 __bpf_kfunc int bpf_dynptr_from_xdp(struct xdp_buff *xdp, u64 flags, 11840 struct bpf_dynptr_kern *ptr__uninit) 11841 { 11842 if (flags) { 11843 bpf_dynptr_set_null(ptr__uninit); 11844 return -EINVAL; 11845 } 11846 11847 bpf_dynptr_init(ptr__uninit, xdp, BPF_DYNPTR_TYPE_XDP, 0, xdp_get_buff_len(xdp)); 11848 11849 return 0; 11850 } 11851 11852 __bpf_kfunc int bpf_sock_addr_set_sun_path(struct bpf_sock_addr_kern *sa_kern, 11853 const u8 *sun_path, u32 sun_path__sz) 11854 { 11855 struct sockaddr_un *un; 11856 11857 if (sa_kern->sk->sk_family != AF_UNIX) 11858 return -EINVAL; 11859 11860 /* We do not allow changing the address to unnamed or larger than the 11861 * maximum allowed address size for a unix sockaddr. 11862 */ 11863 if (sun_path__sz == 0 || sun_path__sz > UNIX_PATH_MAX) 11864 return -EINVAL; 11865 11866 un = (struct sockaddr_un *)sa_kern->uaddr; 11867 memcpy(un->sun_path, sun_path, sun_path__sz); 11868 sa_kern->uaddrlen = offsetof(struct sockaddr_un, sun_path) + sun_path__sz; 11869 11870 return 0; 11871 } 11872 __bpf_kfunc_end_defs(); 11873 11874 int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags, 11875 struct bpf_dynptr_kern *ptr__uninit) 11876 { 11877 int err; 11878 11879 err = bpf_dynptr_from_skb(skb, flags, ptr__uninit); 11880 if (err) 11881 return err; 11882 11883 bpf_dynptr_set_rdonly(ptr__uninit); 11884 11885 return 0; 11886 } 11887 11888 BTF_SET8_START(bpf_kfunc_check_set_skb) 11889 BTF_ID_FLAGS(func, bpf_dynptr_from_skb) 11890 BTF_SET8_END(bpf_kfunc_check_set_skb) 11891 11892 BTF_SET8_START(bpf_kfunc_check_set_xdp) 11893 BTF_ID_FLAGS(func, bpf_dynptr_from_xdp) 11894 BTF_SET8_END(bpf_kfunc_check_set_xdp) 11895 11896 BTF_SET8_START(bpf_kfunc_check_set_sock_addr) 11897 BTF_ID_FLAGS(func, bpf_sock_addr_set_sun_path) 11898 BTF_SET8_END(bpf_kfunc_check_set_sock_addr) 11899 11900 static const struct btf_kfunc_id_set bpf_kfunc_set_skb = { 11901 .owner = THIS_MODULE, 11902 .set = &bpf_kfunc_check_set_skb, 11903 }; 11904 11905 static const struct btf_kfunc_id_set bpf_kfunc_set_xdp = { 11906 .owner = THIS_MODULE, 11907 .set = &bpf_kfunc_check_set_xdp, 11908 }; 11909 11910 static const struct btf_kfunc_id_set bpf_kfunc_set_sock_addr = { 11911 .owner = THIS_MODULE, 11912 .set = &bpf_kfunc_check_set_sock_addr, 11913 }; 11914 11915 static int __init bpf_kfunc_init(void) 11916 { 11917 int ret; 11918 11919 ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, &bpf_kfunc_set_skb); 11920 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_ACT, &bpf_kfunc_set_skb); 11921 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SK_SKB, &bpf_kfunc_set_skb); 11922 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SOCKET_FILTER, &bpf_kfunc_set_skb); 11923 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_CGROUP_SKB, &bpf_kfunc_set_skb); 11924 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_OUT, &bpf_kfunc_set_skb); 11925 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_IN, &bpf_kfunc_set_skb); 11926 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_XMIT, &bpf_kfunc_set_skb); 11927 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_SEG6LOCAL, &bpf_kfunc_set_skb); 11928 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_NETFILTER, &bpf_kfunc_set_skb); 11929 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP, &bpf_kfunc_set_xdp); 11930 return ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_CGROUP_SOCK_ADDR, 11931 &bpf_kfunc_set_sock_addr); 11932 } 11933 late_initcall(bpf_kfunc_init); 11934 11935 __bpf_kfunc_start_defs(); 11936 11937 /* bpf_sock_destroy: Destroy the given socket with ECONNABORTED error code. 11938 * 11939 * The function expects a non-NULL pointer to a socket, and invokes the 11940 * protocol specific socket destroy handlers. 11941 * 11942 * The helper can only be called from BPF contexts that have acquired the socket 11943 * locks. 11944 * 11945 * Parameters: 11946 * @sock: Pointer to socket to be destroyed 11947 * 11948 * Return: 11949 * On error, may return EPROTONOSUPPORT, EINVAL. 11950 * EPROTONOSUPPORT if protocol specific destroy handler is not supported. 11951 * 0 otherwise 11952 */ 11953 __bpf_kfunc int bpf_sock_destroy(struct sock_common *sock) 11954 { 11955 struct sock *sk = (struct sock *)sock; 11956 11957 /* The locking semantics that allow for synchronous execution of the 11958 * destroy handlers are only supported for TCP and UDP. 11959 * Supporting protocols will need to acquire sock lock in the BPF context 11960 * prior to invoking this kfunc. 11961 */ 11962 if (!sk->sk_prot->diag_destroy || (sk->sk_protocol != IPPROTO_TCP && 11963 sk->sk_protocol != IPPROTO_UDP)) 11964 return -EOPNOTSUPP; 11965 11966 return sk->sk_prot->diag_destroy(sk, ECONNABORTED); 11967 } 11968 11969 __bpf_kfunc_end_defs(); 11970 11971 BTF_SET8_START(bpf_sk_iter_kfunc_ids) 11972 BTF_ID_FLAGS(func, bpf_sock_destroy, KF_TRUSTED_ARGS) 11973 BTF_SET8_END(bpf_sk_iter_kfunc_ids) 11974 11975 static int tracing_iter_filter(const struct bpf_prog *prog, u32 kfunc_id) 11976 { 11977 if (btf_id_set8_contains(&bpf_sk_iter_kfunc_ids, kfunc_id) && 11978 prog->expected_attach_type != BPF_TRACE_ITER) 11979 return -EACCES; 11980 return 0; 11981 } 11982 11983 static const struct btf_kfunc_id_set bpf_sk_iter_kfunc_set = { 11984 .owner = THIS_MODULE, 11985 .set = &bpf_sk_iter_kfunc_ids, 11986 .filter = tracing_iter_filter, 11987 }; 11988 11989 static int init_subsystem(void) 11990 { 11991 return register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &bpf_sk_iter_kfunc_set); 11992 } 11993 late_initcall(init_subsystem); 11994