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 85 static const struct bpf_func_proto * 86 bpf_sk_base_func_proto(enum bpf_func_id func_id); 87 88 int copy_bpf_fprog_from_user(struct sock_fprog *dst, sockptr_t src, int len) 89 { 90 if (in_compat_syscall()) { 91 struct compat_sock_fprog f32; 92 93 if (len != sizeof(f32)) 94 return -EINVAL; 95 if (copy_from_sockptr(&f32, src, sizeof(f32))) 96 return -EFAULT; 97 memset(dst, 0, sizeof(*dst)); 98 dst->len = f32.len; 99 dst->filter = compat_ptr(f32.filter); 100 } else { 101 if (len != sizeof(*dst)) 102 return -EINVAL; 103 if (copy_from_sockptr(dst, src, sizeof(*dst))) 104 return -EFAULT; 105 } 106 107 return 0; 108 } 109 EXPORT_SYMBOL_GPL(copy_bpf_fprog_from_user); 110 111 /** 112 * sk_filter_trim_cap - run a packet through a socket filter 113 * @sk: sock associated with &sk_buff 114 * @skb: buffer to filter 115 * @cap: limit on how short the eBPF program may trim the packet 116 * 117 * Run the eBPF program and then cut skb->data to correct size returned by 118 * the program. If pkt_len is 0 we toss packet. If skb->len is smaller 119 * than pkt_len we keep whole skb->data. This is the socket level 120 * wrapper to bpf_prog_run. It returns 0 if the packet should 121 * be accepted or -EPERM if the packet should be tossed. 122 * 123 */ 124 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap) 125 { 126 int err; 127 struct sk_filter *filter; 128 129 /* 130 * If the skb was allocated from pfmemalloc reserves, only 131 * allow SOCK_MEMALLOC sockets to use it as this socket is 132 * helping free memory 133 */ 134 if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) { 135 NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP); 136 return -ENOMEM; 137 } 138 err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb); 139 if (err) 140 return err; 141 142 err = security_sock_rcv_skb(sk, skb); 143 if (err) 144 return err; 145 146 rcu_read_lock(); 147 filter = rcu_dereference(sk->sk_filter); 148 if (filter) { 149 struct sock *save_sk = skb->sk; 150 unsigned int pkt_len; 151 152 skb->sk = sk; 153 pkt_len = bpf_prog_run_save_cb(filter->prog, skb); 154 skb->sk = save_sk; 155 err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM; 156 } 157 rcu_read_unlock(); 158 159 return err; 160 } 161 EXPORT_SYMBOL(sk_filter_trim_cap); 162 163 BPF_CALL_1(bpf_skb_get_pay_offset, struct sk_buff *, skb) 164 { 165 return skb_get_poff(skb); 166 } 167 168 BPF_CALL_3(bpf_skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x) 169 { 170 struct nlattr *nla; 171 172 if (skb_is_nonlinear(skb)) 173 return 0; 174 175 if (skb->len < sizeof(struct nlattr)) 176 return 0; 177 178 if (a > skb->len - sizeof(struct nlattr)) 179 return 0; 180 181 nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x); 182 if (nla) 183 return (void *) nla - (void *) skb->data; 184 185 return 0; 186 } 187 188 BPF_CALL_3(bpf_skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x) 189 { 190 struct nlattr *nla; 191 192 if (skb_is_nonlinear(skb)) 193 return 0; 194 195 if (skb->len < sizeof(struct nlattr)) 196 return 0; 197 198 if (a > skb->len - sizeof(struct nlattr)) 199 return 0; 200 201 nla = (struct nlattr *) &skb->data[a]; 202 if (nla->nla_len > skb->len - a) 203 return 0; 204 205 nla = nla_find_nested(nla, x); 206 if (nla) 207 return (void *) nla - (void *) skb->data; 208 209 return 0; 210 } 211 212 BPF_CALL_4(bpf_skb_load_helper_8, const struct sk_buff *, skb, const void *, 213 data, int, headlen, int, offset) 214 { 215 u8 tmp, *ptr; 216 const int len = sizeof(tmp); 217 218 if (offset >= 0) { 219 if (headlen - offset >= len) 220 return *(u8 *)(data + offset); 221 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 222 return tmp; 223 } else { 224 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 225 if (likely(ptr)) 226 return *(u8 *)ptr; 227 } 228 229 return -EFAULT; 230 } 231 232 BPF_CALL_2(bpf_skb_load_helper_8_no_cache, const struct sk_buff *, skb, 233 int, offset) 234 { 235 return ____bpf_skb_load_helper_8(skb, skb->data, skb->len - skb->data_len, 236 offset); 237 } 238 239 BPF_CALL_4(bpf_skb_load_helper_16, const struct sk_buff *, skb, const void *, 240 data, int, headlen, int, offset) 241 { 242 __be16 tmp, *ptr; 243 const int len = sizeof(tmp); 244 245 if (offset >= 0) { 246 if (headlen - offset >= len) 247 return get_unaligned_be16(data + offset); 248 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 249 return be16_to_cpu(tmp); 250 } else { 251 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 252 if (likely(ptr)) 253 return get_unaligned_be16(ptr); 254 } 255 256 return -EFAULT; 257 } 258 259 BPF_CALL_2(bpf_skb_load_helper_16_no_cache, const struct sk_buff *, skb, 260 int, offset) 261 { 262 return ____bpf_skb_load_helper_16(skb, skb->data, skb->len - skb->data_len, 263 offset); 264 } 265 266 BPF_CALL_4(bpf_skb_load_helper_32, const struct sk_buff *, skb, const void *, 267 data, int, headlen, int, offset) 268 { 269 __be32 tmp, *ptr; 270 const int len = sizeof(tmp); 271 272 if (likely(offset >= 0)) { 273 if (headlen - offset >= len) 274 return get_unaligned_be32(data + offset); 275 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 276 return be32_to_cpu(tmp); 277 } else { 278 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 279 if (likely(ptr)) 280 return get_unaligned_be32(ptr); 281 } 282 283 return -EFAULT; 284 } 285 286 BPF_CALL_2(bpf_skb_load_helper_32_no_cache, const struct sk_buff *, skb, 287 int, offset) 288 { 289 return ____bpf_skb_load_helper_32(skb, skb->data, skb->len - skb->data_len, 290 offset); 291 } 292 293 static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg, 294 struct bpf_insn *insn_buf) 295 { 296 struct bpf_insn *insn = insn_buf; 297 298 switch (skb_field) { 299 case SKF_AD_MARK: 300 BUILD_BUG_ON(sizeof_field(struct sk_buff, mark) != 4); 301 302 *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg, 303 offsetof(struct sk_buff, mark)); 304 break; 305 306 case SKF_AD_PKTTYPE: 307 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET); 308 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX); 309 #ifdef __BIG_ENDIAN_BITFIELD 310 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5); 311 #endif 312 break; 313 314 case SKF_AD_QUEUE: 315 BUILD_BUG_ON(sizeof_field(struct sk_buff, queue_mapping) != 2); 316 317 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, 318 offsetof(struct sk_buff, queue_mapping)); 319 break; 320 321 case SKF_AD_VLAN_TAG: 322 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_tci) != 2); 323 324 /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */ 325 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, 326 offsetof(struct sk_buff, vlan_tci)); 327 break; 328 case SKF_AD_VLAN_TAG_PRESENT: 329 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_all) != 4); 330 *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg, 331 offsetof(struct sk_buff, vlan_all)); 332 *insn++ = BPF_JMP_IMM(BPF_JEQ, dst_reg, 0, 1); 333 *insn++ = BPF_ALU32_IMM(BPF_MOV, dst_reg, 1); 334 break; 335 } 336 337 return insn - insn_buf; 338 } 339 340 static bool convert_bpf_extensions(struct sock_filter *fp, 341 struct bpf_insn **insnp) 342 { 343 struct bpf_insn *insn = *insnp; 344 u32 cnt; 345 346 switch (fp->k) { 347 case SKF_AD_OFF + SKF_AD_PROTOCOL: 348 BUILD_BUG_ON(sizeof_field(struct sk_buff, protocol) != 2); 349 350 /* A = *(u16 *) (CTX + offsetof(protocol)) */ 351 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, 352 offsetof(struct sk_buff, protocol)); 353 /* A = ntohs(A) [emitting a nop or swap16] */ 354 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); 355 break; 356 357 case SKF_AD_OFF + SKF_AD_PKTTYPE: 358 cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn); 359 insn += cnt - 1; 360 break; 361 362 case SKF_AD_OFF + SKF_AD_IFINDEX: 363 case SKF_AD_OFF + SKF_AD_HATYPE: 364 BUILD_BUG_ON(sizeof_field(struct net_device, ifindex) != 4); 365 BUILD_BUG_ON(sizeof_field(struct net_device, type) != 2); 366 367 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 368 BPF_REG_TMP, BPF_REG_CTX, 369 offsetof(struct sk_buff, dev)); 370 /* if (tmp != 0) goto pc + 1 */ 371 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1); 372 *insn++ = BPF_EXIT_INSN(); 373 if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX) 374 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP, 375 offsetof(struct net_device, ifindex)); 376 else 377 *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP, 378 offsetof(struct net_device, type)); 379 break; 380 381 case SKF_AD_OFF + SKF_AD_MARK: 382 cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn); 383 insn += cnt - 1; 384 break; 385 386 case SKF_AD_OFF + SKF_AD_RXHASH: 387 BUILD_BUG_ON(sizeof_field(struct sk_buff, hash) != 4); 388 389 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, 390 offsetof(struct sk_buff, hash)); 391 break; 392 393 case SKF_AD_OFF + SKF_AD_QUEUE: 394 cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn); 395 insn += cnt - 1; 396 break; 397 398 case SKF_AD_OFF + SKF_AD_VLAN_TAG: 399 cnt = convert_skb_access(SKF_AD_VLAN_TAG, 400 BPF_REG_A, BPF_REG_CTX, insn); 401 insn += cnt - 1; 402 break; 403 404 case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT: 405 cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT, 406 BPF_REG_A, BPF_REG_CTX, insn); 407 insn += cnt - 1; 408 break; 409 410 case SKF_AD_OFF + SKF_AD_VLAN_TPID: 411 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_proto) != 2); 412 413 /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */ 414 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, 415 offsetof(struct sk_buff, vlan_proto)); 416 /* A = ntohs(A) [emitting a nop or swap16] */ 417 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); 418 break; 419 420 case SKF_AD_OFF + SKF_AD_PAY_OFFSET: 421 case SKF_AD_OFF + SKF_AD_NLATTR: 422 case SKF_AD_OFF + SKF_AD_NLATTR_NEST: 423 case SKF_AD_OFF + SKF_AD_CPU: 424 case SKF_AD_OFF + SKF_AD_RANDOM: 425 /* arg1 = CTX */ 426 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); 427 /* arg2 = A */ 428 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A); 429 /* arg3 = X */ 430 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X); 431 /* Emit call(arg1=CTX, arg2=A, arg3=X) */ 432 switch (fp->k) { 433 case SKF_AD_OFF + SKF_AD_PAY_OFFSET: 434 *insn = BPF_EMIT_CALL(bpf_skb_get_pay_offset); 435 break; 436 case SKF_AD_OFF + SKF_AD_NLATTR: 437 *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr); 438 break; 439 case SKF_AD_OFF + SKF_AD_NLATTR_NEST: 440 *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr_nest); 441 break; 442 case SKF_AD_OFF + SKF_AD_CPU: 443 *insn = BPF_EMIT_CALL(bpf_get_raw_cpu_id); 444 break; 445 case SKF_AD_OFF + SKF_AD_RANDOM: 446 *insn = BPF_EMIT_CALL(bpf_user_rnd_u32); 447 bpf_user_rnd_init_once(); 448 break; 449 } 450 break; 451 452 case SKF_AD_OFF + SKF_AD_ALU_XOR_X: 453 /* A ^= X */ 454 *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X); 455 break; 456 457 default: 458 /* This is just a dummy call to avoid letting the compiler 459 * evict __bpf_call_base() as an optimization. Placed here 460 * where no-one bothers. 461 */ 462 BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0); 463 return false; 464 } 465 466 *insnp = insn; 467 return true; 468 } 469 470 static bool convert_bpf_ld_abs(struct sock_filter *fp, struct bpf_insn **insnp) 471 { 472 const bool unaligned_ok = IS_BUILTIN(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS); 473 int size = bpf_size_to_bytes(BPF_SIZE(fp->code)); 474 bool endian = BPF_SIZE(fp->code) == BPF_H || 475 BPF_SIZE(fp->code) == BPF_W; 476 bool indirect = BPF_MODE(fp->code) == BPF_IND; 477 const int ip_align = NET_IP_ALIGN; 478 struct bpf_insn *insn = *insnp; 479 int offset = fp->k; 480 481 if (!indirect && 482 ((unaligned_ok && offset >= 0) || 483 (!unaligned_ok && offset >= 0 && 484 offset + ip_align >= 0 && 485 offset + ip_align % size == 0))) { 486 bool ldx_off_ok = offset <= S16_MAX; 487 488 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_H); 489 if (offset) 490 *insn++ = BPF_ALU64_IMM(BPF_SUB, BPF_REG_TMP, offset); 491 *insn++ = BPF_JMP_IMM(BPF_JSLT, BPF_REG_TMP, 492 size, 2 + endian + (!ldx_off_ok * 2)); 493 if (ldx_off_ok) { 494 *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, 495 BPF_REG_D, offset); 496 } else { 497 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_D); 498 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_TMP, offset); 499 *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, 500 BPF_REG_TMP, 0); 501 } 502 if (endian) 503 *insn++ = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, size * 8); 504 *insn++ = BPF_JMP_A(8); 505 } 506 507 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); 508 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_D); 509 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_H); 510 if (!indirect) { 511 *insn++ = BPF_MOV64_IMM(BPF_REG_ARG4, offset); 512 } else { 513 *insn++ = BPF_MOV64_REG(BPF_REG_ARG4, BPF_REG_X); 514 if (fp->k) 515 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_ARG4, offset); 516 } 517 518 switch (BPF_SIZE(fp->code)) { 519 case BPF_B: 520 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8); 521 break; 522 case BPF_H: 523 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16); 524 break; 525 case BPF_W: 526 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32); 527 break; 528 default: 529 return false; 530 } 531 532 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_A, 0, 2); 533 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 534 *insn = BPF_EXIT_INSN(); 535 536 *insnp = insn; 537 return true; 538 } 539 540 /** 541 * bpf_convert_filter - convert filter program 542 * @prog: the user passed filter program 543 * @len: the length of the user passed filter program 544 * @new_prog: allocated 'struct bpf_prog' or NULL 545 * @new_len: pointer to store length of converted program 546 * @seen_ld_abs: bool whether we've seen ld_abs/ind 547 * 548 * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn' 549 * style extended BPF (eBPF). 550 * Conversion workflow: 551 * 552 * 1) First pass for calculating the new program length: 553 * bpf_convert_filter(old_prog, old_len, NULL, &new_len, &seen_ld_abs) 554 * 555 * 2) 2nd pass to remap in two passes: 1st pass finds new 556 * jump offsets, 2nd pass remapping: 557 * bpf_convert_filter(old_prog, old_len, new_prog, &new_len, &seen_ld_abs) 558 */ 559 static int bpf_convert_filter(struct sock_filter *prog, int len, 560 struct bpf_prog *new_prog, int *new_len, 561 bool *seen_ld_abs) 562 { 563 int new_flen = 0, pass = 0, target, i, stack_off; 564 struct bpf_insn *new_insn, *first_insn = NULL; 565 struct sock_filter *fp; 566 int *addrs = NULL; 567 u8 bpf_src; 568 569 BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK); 570 BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG); 571 572 if (len <= 0 || len > BPF_MAXINSNS) 573 return -EINVAL; 574 575 if (new_prog) { 576 first_insn = new_prog->insnsi; 577 addrs = kcalloc(len, sizeof(*addrs), 578 GFP_KERNEL | __GFP_NOWARN); 579 if (!addrs) 580 return -ENOMEM; 581 } 582 583 do_pass: 584 new_insn = first_insn; 585 fp = prog; 586 587 /* Classic BPF related prologue emission. */ 588 if (new_prog) { 589 /* Classic BPF expects A and X to be reset first. These need 590 * to be guaranteed to be the first two instructions. 591 */ 592 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 593 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_X, BPF_REG_X); 594 595 /* All programs must keep CTX in callee saved BPF_REG_CTX. 596 * In eBPF case it's done by the compiler, here we need to 597 * do this ourself. Initial CTX is present in BPF_REG_ARG1. 598 */ 599 *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1); 600 if (*seen_ld_abs) { 601 /* For packet access in classic BPF, cache skb->data 602 * in callee-saved BPF R8 and skb->len - skb->data_len 603 * (headlen) in BPF R9. Since classic BPF is read-only 604 * on CTX, we only need to cache it once. 605 */ 606 *new_insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 607 BPF_REG_D, BPF_REG_CTX, 608 offsetof(struct sk_buff, data)); 609 *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_H, BPF_REG_CTX, 610 offsetof(struct sk_buff, len)); 611 *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_TMP, BPF_REG_CTX, 612 offsetof(struct sk_buff, data_len)); 613 *new_insn++ = BPF_ALU32_REG(BPF_SUB, BPF_REG_H, BPF_REG_TMP); 614 } 615 } else { 616 new_insn += 3; 617 } 618 619 for (i = 0; i < len; fp++, i++) { 620 struct bpf_insn tmp_insns[32] = { }; 621 struct bpf_insn *insn = tmp_insns; 622 623 if (addrs) 624 addrs[i] = new_insn - first_insn; 625 626 switch (fp->code) { 627 /* All arithmetic insns and skb loads map as-is. */ 628 case BPF_ALU | BPF_ADD | BPF_X: 629 case BPF_ALU | BPF_ADD | BPF_K: 630 case BPF_ALU | BPF_SUB | BPF_X: 631 case BPF_ALU | BPF_SUB | BPF_K: 632 case BPF_ALU | BPF_AND | BPF_X: 633 case BPF_ALU | BPF_AND | BPF_K: 634 case BPF_ALU | BPF_OR | BPF_X: 635 case BPF_ALU | BPF_OR | BPF_K: 636 case BPF_ALU | BPF_LSH | BPF_X: 637 case BPF_ALU | BPF_LSH | BPF_K: 638 case BPF_ALU | BPF_RSH | BPF_X: 639 case BPF_ALU | BPF_RSH | BPF_K: 640 case BPF_ALU | BPF_XOR | BPF_X: 641 case BPF_ALU | BPF_XOR | BPF_K: 642 case BPF_ALU | BPF_MUL | BPF_X: 643 case BPF_ALU | BPF_MUL | BPF_K: 644 case BPF_ALU | BPF_DIV | BPF_X: 645 case BPF_ALU | BPF_DIV | BPF_K: 646 case BPF_ALU | BPF_MOD | BPF_X: 647 case BPF_ALU | BPF_MOD | BPF_K: 648 case BPF_ALU | BPF_NEG: 649 case BPF_LD | BPF_ABS | BPF_W: 650 case BPF_LD | BPF_ABS | BPF_H: 651 case BPF_LD | BPF_ABS | BPF_B: 652 case BPF_LD | BPF_IND | BPF_W: 653 case BPF_LD | BPF_IND | BPF_H: 654 case BPF_LD | BPF_IND | BPF_B: 655 /* Check for overloaded BPF extension and 656 * directly convert it if found, otherwise 657 * just move on with mapping. 658 */ 659 if (BPF_CLASS(fp->code) == BPF_LD && 660 BPF_MODE(fp->code) == BPF_ABS && 661 convert_bpf_extensions(fp, &insn)) 662 break; 663 if (BPF_CLASS(fp->code) == BPF_LD && 664 convert_bpf_ld_abs(fp, &insn)) { 665 *seen_ld_abs = true; 666 break; 667 } 668 669 if (fp->code == (BPF_ALU | BPF_DIV | BPF_X) || 670 fp->code == (BPF_ALU | BPF_MOD | BPF_X)) { 671 *insn++ = BPF_MOV32_REG(BPF_REG_X, BPF_REG_X); 672 /* Error with exception code on div/mod by 0. 673 * For cBPF programs, this was always return 0. 674 */ 675 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_X, 0, 2); 676 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 677 *insn++ = BPF_EXIT_INSN(); 678 } 679 680 *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k); 681 break; 682 683 /* Jump transformation cannot use BPF block macros 684 * everywhere as offset calculation and target updates 685 * require a bit more work than the rest, i.e. jump 686 * opcodes map as-is, but offsets need adjustment. 687 */ 688 689 #define BPF_EMIT_JMP \ 690 do { \ 691 const s32 off_min = S16_MIN, off_max = S16_MAX; \ 692 s32 off; \ 693 \ 694 if (target >= len || target < 0) \ 695 goto err; \ 696 off = addrs ? addrs[target] - addrs[i] - 1 : 0; \ 697 /* Adjust pc relative offset for 2nd or 3rd insn. */ \ 698 off -= insn - tmp_insns; \ 699 /* Reject anything not fitting into insn->off. */ \ 700 if (off < off_min || off > off_max) \ 701 goto err; \ 702 insn->off = off; \ 703 } while (0) 704 705 case BPF_JMP | BPF_JA: 706 target = i + fp->k + 1; 707 insn->code = fp->code; 708 BPF_EMIT_JMP; 709 break; 710 711 case BPF_JMP | BPF_JEQ | BPF_K: 712 case BPF_JMP | BPF_JEQ | BPF_X: 713 case BPF_JMP | BPF_JSET | BPF_K: 714 case BPF_JMP | BPF_JSET | BPF_X: 715 case BPF_JMP | BPF_JGT | BPF_K: 716 case BPF_JMP | BPF_JGT | BPF_X: 717 case BPF_JMP | BPF_JGE | BPF_K: 718 case BPF_JMP | BPF_JGE | BPF_X: 719 if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) { 720 /* BPF immediates are signed, zero extend 721 * immediate into tmp register and use it 722 * in compare insn. 723 */ 724 *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k); 725 726 insn->dst_reg = BPF_REG_A; 727 insn->src_reg = BPF_REG_TMP; 728 bpf_src = BPF_X; 729 } else { 730 insn->dst_reg = BPF_REG_A; 731 insn->imm = fp->k; 732 bpf_src = BPF_SRC(fp->code); 733 insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0; 734 } 735 736 /* Common case where 'jump_false' is next insn. */ 737 if (fp->jf == 0) { 738 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; 739 target = i + fp->jt + 1; 740 BPF_EMIT_JMP; 741 break; 742 } 743 744 /* Convert some jumps when 'jump_true' is next insn. */ 745 if (fp->jt == 0) { 746 switch (BPF_OP(fp->code)) { 747 case BPF_JEQ: 748 insn->code = BPF_JMP | BPF_JNE | bpf_src; 749 break; 750 case BPF_JGT: 751 insn->code = BPF_JMP | BPF_JLE | bpf_src; 752 break; 753 case BPF_JGE: 754 insn->code = BPF_JMP | BPF_JLT | bpf_src; 755 break; 756 default: 757 goto jmp_rest; 758 } 759 760 target = i + fp->jf + 1; 761 BPF_EMIT_JMP; 762 break; 763 } 764 jmp_rest: 765 /* Other jumps are mapped into two insns: Jxx and JA. */ 766 target = i + fp->jt + 1; 767 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; 768 BPF_EMIT_JMP; 769 insn++; 770 771 insn->code = BPF_JMP | BPF_JA; 772 target = i + fp->jf + 1; 773 BPF_EMIT_JMP; 774 break; 775 776 /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */ 777 case BPF_LDX | BPF_MSH | BPF_B: { 778 struct sock_filter tmp = { 779 .code = BPF_LD | BPF_ABS | BPF_B, 780 .k = fp->k, 781 }; 782 783 *seen_ld_abs = true; 784 785 /* X = A */ 786 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 787 /* A = BPF_R0 = *(u8 *) (skb->data + K) */ 788 convert_bpf_ld_abs(&tmp, &insn); 789 insn++; 790 /* A &= 0xf */ 791 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf); 792 /* A <<= 2 */ 793 *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2); 794 /* tmp = X */ 795 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_X); 796 /* X = A */ 797 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 798 /* A = tmp */ 799 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP); 800 break; 801 } 802 /* RET_K is remaped into 2 insns. RET_A case doesn't need an 803 * extra mov as BPF_REG_0 is already mapped into BPF_REG_A. 804 */ 805 case BPF_RET | BPF_A: 806 case BPF_RET | BPF_K: 807 if (BPF_RVAL(fp->code) == BPF_K) 808 *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0, 809 0, fp->k); 810 *insn = BPF_EXIT_INSN(); 811 break; 812 813 /* Store to stack. */ 814 case BPF_ST: 815 case BPF_STX: 816 stack_off = fp->k * 4 + 4; 817 *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) == 818 BPF_ST ? BPF_REG_A : BPF_REG_X, 819 -stack_off); 820 /* check_load_and_stores() verifies that classic BPF can 821 * load from stack only after write, so tracking 822 * stack_depth for ST|STX insns is enough 823 */ 824 if (new_prog && new_prog->aux->stack_depth < stack_off) 825 new_prog->aux->stack_depth = stack_off; 826 break; 827 828 /* Load from stack. */ 829 case BPF_LD | BPF_MEM: 830 case BPF_LDX | BPF_MEM: 831 stack_off = fp->k * 4 + 4; 832 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? 833 BPF_REG_A : BPF_REG_X, BPF_REG_FP, 834 -stack_off); 835 break; 836 837 /* A = K or X = K */ 838 case BPF_LD | BPF_IMM: 839 case BPF_LDX | BPF_IMM: 840 *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ? 841 BPF_REG_A : BPF_REG_X, fp->k); 842 break; 843 844 /* X = A */ 845 case BPF_MISC | BPF_TAX: 846 *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 847 break; 848 849 /* A = X */ 850 case BPF_MISC | BPF_TXA: 851 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X); 852 break; 853 854 /* A = skb->len or X = skb->len */ 855 case BPF_LD | BPF_W | BPF_LEN: 856 case BPF_LDX | BPF_W | BPF_LEN: 857 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? 858 BPF_REG_A : BPF_REG_X, BPF_REG_CTX, 859 offsetof(struct sk_buff, len)); 860 break; 861 862 /* Access seccomp_data fields. */ 863 case BPF_LDX | BPF_ABS | BPF_W: 864 /* A = *(u32 *) (ctx + K) */ 865 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k); 866 break; 867 868 /* Unknown instruction. */ 869 default: 870 goto err; 871 } 872 873 insn++; 874 if (new_prog) 875 memcpy(new_insn, tmp_insns, 876 sizeof(*insn) * (insn - tmp_insns)); 877 new_insn += insn - tmp_insns; 878 } 879 880 if (!new_prog) { 881 /* Only calculating new length. */ 882 *new_len = new_insn - first_insn; 883 if (*seen_ld_abs) 884 *new_len += 4; /* Prologue bits. */ 885 return 0; 886 } 887 888 pass++; 889 if (new_flen != new_insn - first_insn) { 890 new_flen = new_insn - first_insn; 891 if (pass > 2) 892 goto err; 893 goto do_pass; 894 } 895 896 kfree(addrs); 897 BUG_ON(*new_len != new_flen); 898 return 0; 899 err: 900 kfree(addrs); 901 return -EINVAL; 902 } 903 904 /* Security: 905 * 906 * As we dont want to clear mem[] array for each packet going through 907 * __bpf_prog_run(), we check that filter loaded by user never try to read 908 * a cell if not previously written, and we check all branches to be sure 909 * a malicious user doesn't try to abuse us. 910 */ 911 static int check_load_and_stores(const struct sock_filter *filter, int flen) 912 { 913 u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */ 914 int pc, ret = 0; 915 916 BUILD_BUG_ON(BPF_MEMWORDS > 16); 917 918 masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL); 919 if (!masks) 920 return -ENOMEM; 921 922 memset(masks, 0xff, flen * sizeof(*masks)); 923 924 for (pc = 0; pc < flen; pc++) { 925 memvalid &= masks[pc]; 926 927 switch (filter[pc].code) { 928 case BPF_ST: 929 case BPF_STX: 930 memvalid |= (1 << filter[pc].k); 931 break; 932 case BPF_LD | BPF_MEM: 933 case BPF_LDX | BPF_MEM: 934 if (!(memvalid & (1 << filter[pc].k))) { 935 ret = -EINVAL; 936 goto error; 937 } 938 break; 939 case BPF_JMP | BPF_JA: 940 /* A jump must set masks on target */ 941 masks[pc + 1 + filter[pc].k] &= memvalid; 942 memvalid = ~0; 943 break; 944 case BPF_JMP | BPF_JEQ | BPF_K: 945 case BPF_JMP | BPF_JEQ | BPF_X: 946 case BPF_JMP | BPF_JGE | BPF_K: 947 case BPF_JMP | BPF_JGE | BPF_X: 948 case BPF_JMP | BPF_JGT | BPF_K: 949 case BPF_JMP | BPF_JGT | BPF_X: 950 case BPF_JMP | BPF_JSET | BPF_K: 951 case BPF_JMP | BPF_JSET | BPF_X: 952 /* A jump must set masks on targets */ 953 masks[pc + 1 + filter[pc].jt] &= memvalid; 954 masks[pc + 1 + filter[pc].jf] &= memvalid; 955 memvalid = ~0; 956 break; 957 } 958 } 959 error: 960 kfree(masks); 961 return ret; 962 } 963 964 static bool chk_code_allowed(u16 code_to_probe) 965 { 966 static const bool codes[] = { 967 /* 32 bit ALU operations */ 968 [BPF_ALU | BPF_ADD | BPF_K] = true, 969 [BPF_ALU | BPF_ADD | BPF_X] = true, 970 [BPF_ALU | BPF_SUB | BPF_K] = true, 971 [BPF_ALU | BPF_SUB | BPF_X] = true, 972 [BPF_ALU | BPF_MUL | BPF_K] = true, 973 [BPF_ALU | BPF_MUL | BPF_X] = true, 974 [BPF_ALU | BPF_DIV | BPF_K] = true, 975 [BPF_ALU | BPF_DIV | BPF_X] = true, 976 [BPF_ALU | BPF_MOD | BPF_K] = true, 977 [BPF_ALU | BPF_MOD | BPF_X] = true, 978 [BPF_ALU | BPF_AND | BPF_K] = true, 979 [BPF_ALU | BPF_AND | BPF_X] = true, 980 [BPF_ALU | BPF_OR | BPF_K] = true, 981 [BPF_ALU | BPF_OR | BPF_X] = true, 982 [BPF_ALU | BPF_XOR | BPF_K] = true, 983 [BPF_ALU | BPF_XOR | BPF_X] = true, 984 [BPF_ALU | BPF_LSH | BPF_K] = true, 985 [BPF_ALU | BPF_LSH | BPF_X] = true, 986 [BPF_ALU | BPF_RSH | BPF_K] = true, 987 [BPF_ALU | BPF_RSH | BPF_X] = true, 988 [BPF_ALU | BPF_NEG] = true, 989 /* Load instructions */ 990 [BPF_LD | BPF_W | BPF_ABS] = true, 991 [BPF_LD | BPF_H | BPF_ABS] = true, 992 [BPF_LD | BPF_B | BPF_ABS] = true, 993 [BPF_LD | BPF_W | BPF_LEN] = true, 994 [BPF_LD | BPF_W | BPF_IND] = true, 995 [BPF_LD | BPF_H | BPF_IND] = true, 996 [BPF_LD | BPF_B | BPF_IND] = true, 997 [BPF_LD | BPF_IMM] = true, 998 [BPF_LD | BPF_MEM] = true, 999 [BPF_LDX | BPF_W | BPF_LEN] = true, 1000 [BPF_LDX | BPF_B | BPF_MSH] = true, 1001 [BPF_LDX | BPF_IMM] = true, 1002 [BPF_LDX | BPF_MEM] = true, 1003 /* Store instructions */ 1004 [BPF_ST] = true, 1005 [BPF_STX] = true, 1006 /* Misc instructions */ 1007 [BPF_MISC | BPF_TAX] = true, 1008 [BPF_MISC | BPF_TXA] = true, 1009 /* Return instructions */ 1010 [BPF_RET | BPF_K] = true, 1011 [BPF_RET | BPF_A] = true, 1012 /* Jump instructions */ 1013 [BPF_JMP | BPF_JA] = true, 1014 [BPF_JMP | BPF_JEQ | BPF_K] = true, 1015 [BPF_JMP | BPF_JEQ | BPF_X] = true, 1016 [BPF_JMP | BPF_JGE | BPF_K] = true, 1017 [BPF_JMP | BPF_JGE | BPF_X] = true, 1018 [BPF_JMP | BPF_JGT | BPF_K] = true, 1019 [BPF_JMP | BPF_JGT | BPF_X] = true, 1020 [BPF_JMP | BPF_JSET | BPF_K] = true, 1021 [BPF_JMP | BPF_JSET | BPF_X] = true, 1022 }; 1023 1024 if (code_to_probe >= ARRAY_SIZE(codes)) 1025 return false; 1026 1027 return codes[code_to_probe]; 1028 } 1029 1030 static bool bpf_check_basics_ok(const struct sock_filter *filter, 1031 unsigned int flen) 1032 { 1033 if (filter == NULL) 1034 return false; 1035 if (flen == 0 || flen > BPF_MAXINSNS) 1036 return false; 1037 1038 return true; 1039 } 1040 1041 /** 1042 * bpf_check_classic - verify socket filter code 1043 * @filter: filter to verify 1044 * @flen: length of filter 1045 * 1046 * Check the user's filter code. If we let some ugly 1047 * filter code slip through kaboom! The filter must contain 1048 * no references or jumps that are out of range, no illegal 1049 * instructions, and must end with a RET instruction. 1050 * 1051 * All jumps are forward as they are not signed. 1052 * 1053 * Returns 0 if the rule set is legal or -EINVAL if not. 1054 */ 1055 static int bpf_check_classic(const struct sock_filter *filter, 1056 unsigned int flen) 1057 { 1058 bool anc_found; 1059 int pc; 1060 1061 /* Check the filter code now */ 1062 for (pc = 0; pc < flen; pc++) { 1063 const struct sock_filter *ftest = &filter[pc]; 1064 1065 /* May we actually operate on this code? */ 1066 if (!chk_code_allowed(ftest->code)) 1067 return -EINVAL; 1068 1069 /* Some instructions need special checks */ 1070 switch (ftest->code) { 1071 case BPF_ALU | BPF_DIV | BPF_K: 1072 case BPF_ALU | BPF_MOD | BPF_K: 1073 /* Check for division by zero */ 1074 if (ftest->k == 0) 1075 return -EINVAL; 1076 break; 1077 case BPF_ALU | BPF_LSH | BPF_K: 1078 case BPF_ALU | BPF_RSH | BPF_K: 1079 if (ftest->k >= 32) 1080 return -EINVAL; 1081 break; 1082 case BPF_LD | BPF_MEM: 1083 case BPF_LDX | BPF_MEM: 1084 case BPF_ST: 1085 case BPF_STX: 1086 /* Check for invalid memory addresses */ 1087 if (ftest->k >= BPF_MEMWORDS) 1088 return -EINVAL; 1089 break; 1090 case BPF_JMP | BPF_JA: 1091 /* Note, the large ftest->k might cause loops. 1092 * Compare this with conditional jumps below, 1093 * where offsets are limited. --ANK (981016) 1094 */ 1095 if (ftest->k >= (unsigned int)(flen - pc - 1)) 1096 return -EINVAL; 1097 break; 1098 case BPF_JMP | BPF_JEQ | BPF_K: 1099 case BPF_JMP | BPF_JEQ | BPF_X: 1100 case BPF_JMP | BPF_JGE | BPF_K: 1101 case BPF_JMP | BPF_JGE | BPF_X: 1102 case BPF_JMP | BPF_JGT | BPF_K: 1103 case BPF_JMP | BPF_JGT | BPF_X: 1104 case BPF_JMP | BPF_JSET | BPF_K: 1105 case BPF_JMP | BPF_JSET | BPF_X: 1106 /* Both conditionals must be safe */ 1107 if (pc + ftest->jt + 1 >= flen || 1108 pc + ftest->jf + 1 >= flen) 1109 return -EINVAL; 1110 break; 1111 case BPF_LD | BPF_W | BPF_ABS: 1112 case BPF_LD | BPF_H | BPF_ABS: 1113 case BPF_LD | BPF_B | BPF_ABS: 1114 anc_found = false; 1115 if (bpf_anc_helper(ftest) & BPF_ANC) 1116 anc_found = true; 1117 /* Ancillary operation unknown or unsupported */ 1118 if (anc_found == false && ftest->k >= SKF_AD_OFF) 1119 return -EINVAL; 1120 } 1121 } 1122 1123 /* Last instruction must be a RET code */ 1124 switch (filter[flen - 1].code) { 1125 case BPF_RET | BPF_K: 1126 case BPF_RET | BPF_A: 1127 return check_load_and_stores(filter, flen); 1128 } 1129 1130 return -EINVAL; 1131 } 1132 1133 static int bpf_prog_store_orig_filter(struct bpf_prog *fp, 1134 const struct sock_fprog *fprog) 1135 { 1136 unsigned int fsize = bpf_classic_proglen(fprog); 1137 struct sock_fprog_kern *fkprog; 1138 1139 fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL); 1140 if (!fp->orig_prog) 1141 return -ENOMEM; 1142 1143 fkprog = fp->orig_prog; 1144 fkprog->len = fprog->len; 1145 1146 fkprog->filter = kmemdup(fp->insns, fsize, 1147 GFP_KERNEL | __GFP_NOWARN); 1148 if (!fkprog->filter) { 1149 kfree(fp->orig_prog); 1150 return -ENOMEM; 1151 } 1152 1153 return 0; 1154 } 1155 1156 static void bpf_release_orig_filter(struct bpf_prog *fp) 1157 { 1158 struct sock_fprog_kern *fprog = fp->orig_prog; 1159 1160 if (fprog) { 1161 kfree(fprog->filter); 1162 kfree(fprog); 1163 } 1164 } 1165 1166 static void __bpf_prog_release(struct bpf_prog *prog) 1167 { 1168 if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) { 1169 bpf_prog_put(prog); 1170 } else { 1171 bpf_release_orig_filter(prog); 1172 bpf_prog_free(prog); 1173 } 1174 } 1175 1176 static void __sk_filter_release(struct sk_filter *fp) 1177 { 1178 __bpf_prog_release(fp->prog); 1179 kfree(fp); 1180 } 1181 1182 /** 1183 * sk_filter_release_rcu - Release a socket filter by rcu_head 1184 * @rcu: rcu_head that contains the sk_filter to free 1185 */ 1186 static void sk_filter_release_rcu(struct rcu_head *rcu) 1187 { 1188 struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu); 1189 1190 __sk_filter_release(fp); 1191 } 1192 1193 /** 1194 * sk_filter_release - release a socket filter 1195 * @fp: filter to remove 1196 * 1197 * Remove a filter from a socket and release its resources. 1198 */ 1199 static void sk_filter_release(struct sk_filter *fp) 1200 { 1201 if (refcount_dec_and_test(&fp->refcnt)) 1202 call_rcu(&fp->rcu, sk_filter_release_rcu); 1203 } 1204 1205 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) 1206 { 1207 u32 filter_size = bpf_prog_size(fp->prog->len); 1208 1209 atomic_sub(filter_size, &sk->sk_omem_alloc); 1210 sk_filter_release(fp); 1211 } 1212 1213 /* try to charge the socket memory if there is space available 1214 * return true on success 1215 */ 1216 static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp) 1217 { 1218 u32 filter_size = bpf_prog_size(fp->prog->len); 1219 int optmem_max = READ_ONCE(sysctl_optmem_max); 1220 1221 /* same check as in sock_kmalloc() */ 1222 if (filter_size <= optmem_max && 1223 atomic_read(&sk->sk_omem_alloc) + filter_size < optmem_max) { 1224 atomic_add(filter_size, &sk->sk_omem_alloc); 1225 return true; 1226 } 1227 return false; 1228 } 1229 1230 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp) 1231 { 1232 if (!refcount_inc_not_zero(&fp->refcnt)) 1233 return false; 1234 1235 if (!__sk_filter_charge(sk, fp)) { 1236 sk_filter_release(fp); 1237 return false; 1238 } 1239 return true; 1240 } 1241 1242 static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp) 1243 { 1244 struct sock_filter *old_prog; 1245 struct bpf_prog *old_fp; 1246 int err, new_len, old_len = fp->len; 1247 bool seen_ld_abs = false; 1248 1249 /* We are free to overwrite insns et al right here as it won't be used at 1250 * this point in time anymore internally after the migration to the eBPF 1251 * instruction representation. 1252 */ 1253 BUILD_BUG_ON(sizeof(struct sock_filter) != 1254 sizeof(struct bpf_insn)); 1255 1256 /* Conversion cannot happen on overlapping memory areas, 1257 * so we need to keep the user BPF around until the 2nd 1258 * pass. At this time, the user BPF is stored in fp->insns. 1259 */ 1260 old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter), 1261 GFP_KERNEL | __GFP_NOWARN); 1262 if (!old_prog) { 1263 err = -ENOMEM; 1264 goto out_err; 1265 } 1266 1267 /* 1st pass: calculate the new program length. */ 1268 err = bpf_convert_filter(old_prog, old_len, NULL, &new_len, 1269 &seen_ld_abs); 1270 if (err) 1271 goto out_err_free; 1272 1273 /* Expand fp for appending the new filter representation. */ 1274 old_fp = fp; 1275 fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0); 1276 if (!fp) { 1277 /* The old_fp is still around in case we couldn't 1278 * allocate new memory, so uncharge on that one. 1279 */ 1280 fp = old_fp; 1281 err = -ENOMEM; 1282 goto out_err_free; 1283 } 1284 1285 fp->len = new_len; 1286 1287 /* 2nd pass: remap sock_filter insns into bpf_insn insns. */ 1288 err = bpf_convert_filter(old_prog, old_len, fp, &new_len, 1289 &seen_ld_abs); 1290 if (err) 1291 /* 2nd bpf_convert_filter() can fail only if it fails 1292 * to allocate memory, remapping must succeed. Note, 1293 * that at this time old_fp has already been released 1294 * by krealloc(). 1295 */ 1296 goto out_err_free; 1297 1298 fp = bpf_prog_select_runtime(fp, &err); 1299 if (err) 1300 goto out_err_free; 1301 1302 kfree(old_prog); 1303 return fp; 1304 1305 out_err_free: 1306 kfree(old_prog); 1307 out_err: 1308 __bpf_prog_release(fp); 1309 return ERR_PTR(err); 1310 } 1311 1312 static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp, 1313 bpf_aux_classic_check_t trans) 1314 { 1315 int err; 1316 1317 fp->bpf_func = NULL; 1318 fp->jited = 0; 1319 1320 err = bpf_check_classic(fp->insns, fp->len); 1321 if (err) { 1322 __bpf_prog_release(fp); 1323 return ERR_PTR(err); 1324 } 1325 1326 /* There might be additional checks and transformations 1327 * needed on classic filters, f.e. in case of seccomp. 1328 */ 1329 if (trans) { 1330 err = trans(fp->insns, fp->len); 1331 if (err) { 1332 __bpf_prog_release(fp); 1333 return ERR_PTR(err); 1334 } 1335 } 1336 1337 /* Probe if we can JIT compile the filter and if so, do 1338 * the compilation of the filter. 1339 */ 1340 bpf_jit_compile(fp); 1341 1342 /* JIT compiler couldn't process this filter, so do the eBPF translation 1343 * for the optimized interpreter. 1344 */ 1345 if (!fp->jited) 1346 fp = bpf_migrate_filter(fp); 1347 1348 return fp; 1349 } 1350 1351 /** 1352 * bpf_prog_create - create an unattached filter 1353 * @pfp: the unattached filter that is created 1354 * @fprog: the filter program 1355 * 1356 * Create a filter independent of any socket. We first run some 1357 * sanity checks on it to make sure it does not explode on us later. 1358 * If an error occurs or there is insufficient memory for the filter 1359 * a negative errno code is returned. On success the return is zero. 1360 */ 1361 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog) 1362 { 1363 unsigned int fsize = bpf_classic_proglen(fprog); 1364 struct bpf_prog *fp; 1365 1366 /* Make sure new filter is there and in the right amounts. */ 1367 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1368 return -EINVAL; 1369 1370 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1371 if (!fp) 1372 return -ENOMEM; 1373 1374 memcpy(fp->insns, fprog->filter, fsize); 1375 1376 fp->len = fprog->len; 1377 /* Since unattached filters are not copied back to user 1378 * space through sk_get_filter(), we do not need to hold 1379 * a copy here, and can spare us the work. 1380 */ 1381 fp->orig_prog = NULL; 1382 1383 /* bpf_prepare_filter() already takes care of freeing 1384 * memory in case something goes wrong. 1385 */ 1386 fp = bpf_prepare_filter(fp, NULL); 1387 if (IS_ERR(fp)) 1388 return PTR_ERR(fp); 1389 1390 *pfp = fp; 1391 return 0; 1392 } 1393 EXPORT_SYMBOL_GPL(bpf_prog_create); 1394 1395 /** 1396 * bpf_prog_create_from_user - create an unattached filter from user buffer 1397 * @pfp: the unattached filter that is created 1398 * @fprog: the filter program 1399 * @trans: post-classic verifier transformation handler 1400 * @save_orig: save classic BPF program 1401 * 1402 * This function effectively does the same as bpf_prog_create(), only 1403 * that it builds up its insns buffer from user space provided buffer. 1404 * It also allows for passing a bpf_aux_classic_check_t handler. 1405 */ 1406 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, 1407 bpf_aux_classic_check_t trans, bool save_orig) 1408 { 1409 unsigned int fsize = bpf_classic_proglen(fprog); 1410 struct bpf_prog *fp; 1411 int err; 1412 1413 /* Make sure new filter is there and in the right amounts. */ 1414 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1415 return -EINVAL; 1416 1417 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1418 if (!fp) 1419 return -ENOMEM; 1420 1421 if (copy_from_user(fp->insns, fprog->filter, fsize)) { 1422 __bpf_prog_free(fp); 1423 return -EFAULT; 1424 } 1425 1426 fp->len = fprog->len; 1427 fp->orig_prog = NULL; 1428 1429 if (save_orig) { 1430 err = bpf_prog_store_orig_filter(fp, fprog); 1431 if (err) { 1432 __bpf_prog_free(fp); 1433 return -ENOMEM; 1434 } 1435 } 1436 1437 /* bpf_prepare_filter() already takes care of freeing 1438 * memory in case something goes wrong. 1439 */ 1440 fp = bpf_prepare_filter(fp, trans); 1441 if (IS_ERR(fp)) 1442 return PTR_ERR(fp); 1443 1444 *pfp = fp; 1445 return 0; 1446 } 1447 EXPORT_SYMBOL_GPL(bpf_prog_create_from_user); 1448 1449 void bpf_prog_destroy(struct bpf_prog *fp) 1450 { 1451 __bpf_prog_release(fp); 1452 } 1453 EXPORT_SYMBOL_GPL(bpf_prog_destroy); 1454 1455 static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk) 1456 { 1457 struct sk_filter *fp, *old_fp; 1458 1459 fp = kmalloc(sizeof(*fp), GFP_KERNEL); 1460 if (!fp) 1461 return -ENOMEM; 1462 1463 fp->prog = prog; 1464 1465 if (!__sk_filter_charge(sk, fp)) { 1466 kfree(fp); 1467 return -ENOMEM; 1468 } 1469 refcount_set(&fp->refcnt, 1); 1470 1471 old_fp = rcu_dereference_protected(sk->sk_filter, 1472 lockdep_sock_is_held(sk)); 1473 rcu_assign_pointer(sk->sk_filter, fp); 1474 1475 if (old_fp) 1476 sk_filter_uncharge(sk, old_fp); 1477 1478 return 0; 1479 } 1480 1481 static 1482 struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk) 1483 { 1484 unsigned int fsize = bpf_classic_proglen(fprog); 1485 struct bpf_prog *prog; 1486 int err; 1487 1488 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1489 return ERR_PTR(-EPERM); 1490 1491 /* Make sure new filter is there and in the right amounts. */ 1492 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1493 return ERR_PTR(-EINVAL); 1494 1495 prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1496 if (!prog) 1497 return ERR_PTR(-ENOMEM); 1498 1499 if (copy_from_user(prog->insns, fprog->filter, fsize)) { 1500 __bpf_prog_free(prog); 1501 return ERR_PTR(-EFAULT); 1502 } 1503 1504 prog->len = fprog->len; 1505 1506 err = bpf_prog_store_orig_filter(prog, fprog); 1507 if (err) { 1508 __bpf_prog_free(prog); 1509 return ERR_PTR(-ENOMEM); 1510 } 1511 1512 /* bpf_prepare_filter() already takes care of freeing 1513 * memory in case something goes wrong. 1514 */ 1515 return bpf_prepare_filter(prog, NULL); 1516 } 1517 1518 /** 1519 * sk_attach_filter - attach a socket filter 1520 * @fprog: the filter program 1521 * @sk: the socket to use 1522 * 1523 * Attach the user's filter code. We first run some sanity checks on 1524 * it to make sure it does not explode on us later. If an error 1525 * occurs or there is insufficient memory for the filter a negative 1526 * errno code is returned. On success the return is zero. 1527 */ 1528 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk) 1529 { 1530 struct bpf_prog *prog = __get_filter(fprog, sk); 1531 int err; 1532 1533 if (IS_ERR(prog)) 1534 return PTR_ERR(prog); 1535 1536 err = __sk_attach_prog(prog, sk); 1537 if (err < 0) { 1538 __bpf_prog_release(prog); 1539 return err; 1540 } 1541 1542 return 0; 1543 } 1544 EXPORT_SYMBOL_GPL(sk_attach_filter); 1545 1546 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk) 1547 { 1548 struct bpf_prog *prog = __get_filter(fprog, sk); 1549 int err; 1550 1551 if (IS_ERR(prog)) 1552 return PTR_ERR(prog); 1553 1554 if (bpf_prog_size(prog->len) > READ_ONCE(sysctl_optmem_max)) 1555 err = -ENOMEM; 1556 else 1557 err = reuseport_attach_prog(sk, prog); 1558 1559 if (err) 1560 __bpf_prog_release(prog); 1561 1562 return err; 1563 } 1564 1565 static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk) 1566 { 1567 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1568 return ERR_PTR(-EPERM); 1569 1570 return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); 1571 } 1572 1573 int sk_attach_bpf(u32 ufd, struct sock *sk) 1574 { 1575 struct bpf_prog *prog = __get_bpf(ufd, sk); 1576 int err; 1577 1578 if (IS_ERR(prog)) 1579 return PTR_ERR(prog); 1580 1581 err = __sk_attach_prog(prog, sk); 1582 if (err < 0) { 1583 bpf_prog_put(prog); 1584 return err; 1585 } 1586 1587 return 0; 1588 } 1589 1590 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk) 1591 { 1592 struct bpf_prog *prog; 1593 int err; 1594 1595 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1596 return -EPERM; 1597 1598 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); 1599 if (PTR_ERR(prog) == -EINVAL) 1600 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SK_REUSEPORT); 1601 if (IS_ERR(prog)) 1602 return PTR_ERR(prog); 1603 1604 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) { 1605 /* Like other non BPF_PROG_TYPE_SOCKET_FILTER 1606 * bpf prog (e.g. sockmap). It depends on the 1607 * limitation imposed by bpf_prog_load(). 1608 * Hence, sysctl_optmem_max is not checked. 1609 */ 1610 if ((sk->sk_type != SOCK_STREAM && 1611 sk->sk_type != SOCK_DGRAM) || 1612 (sk->sk_protocol != IPPROTO_UDP && 1613 sk->sk_protocol != IPPROTO_TCP) || 1614 (sk->sk_family != AF_INET && 1615 sk->sk_family != AF_INET6)) { 1616 err = -ENOTSUPP; 1617 goto err_prog_put; 1618 } 1619 } else { 1620 /* BPF_PROG_TYPE_SOCKET_FILTER */ 1621 if (bpf_prog_size(prog->len) > READ_ONCE(sysctl_optmem_max)) { 1622 err = -ENOMEM; 1623 goto err_prog_put; 1624 } 1625 } 1626 1627 err = reuseport_attach_prog(sk, prog); 1628 err_prog_put: 1629 if (err) 1630 bpf_prog_put(prog); 1631 1632 return err; 1633 } 1634 1635 void sk_reuseport_prog_free(struct bpf_prog *prog) 1636 { 1637 if (!prog) 1638 return; 1639 1640 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) 1641 bpf_prog_put(prog); 1642 else 1643 bpf_prog_destroy(prog); 1644 } 1645 1646 struct bpf_scratchpad { 1647 union { 1648 __be32 diff[MAX_BPF_STACK / sizeof(__be32)]; 1649 u8 buff[MAX_BPF_STACK]; 1650 }; 1651 }; 1652 1653 static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp); 1654 1655 static inline int __bpf_try_make_writable(struct sk_buff *skb, 1656 unsigned int write_len) 1657 { 1658 return skb_ensure_writable(skb, write_len); 1659 } 1660 1661 static inline int bpf_try_make_writable(struct sk_buff *skb, 1662 unsigned int write_len) 1663 { 1664 int err = __bpf_try_make_writable(skb, write_len); 1665 1666 bpf_compute_data_pointers(skb); 1667 return err; 1668 } 1669 1670 static int bpf_try_make_head_writable(struct sk_buff *skb) 1671 { 1672 return bpf_try_make_writable(skb, skb_headlen(skb)); 1673 } 1674 1675 static inline void bpf_push_mac_rcsum(struct sk_buff *skb) 1676 { 1677 if (skb_at_tc_ingress(skb)) 1678 skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len); 1679 } 1680 1681 static inline void bpf_pull_mac_rcsum(struct sk_buff *skb) 1682 { 1683 if (skb_at_tc_ingress(skb)) 1684 skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len); 1685 } 1686 1687 BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset, 1688 const void *, from, u32, len, u64, flags) 1689 { 1690 void *ptr; 1691 1692 if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH))) 1693 return -EINVAL; 1694 if (unlikely(offset > INT_MAX)) 1695 return -EFAULT; 1696 if (unlikely(bpf_try_make_writable(skb, offset + len))) 1697 return -EFAULT; 1698 1699 ptr = skb->data + offset; 1700 if (flags & BPF_F_RECOMPUTE_CSUM) 1701 __skb_postpull_rcsum(skb, ptr, len, offset); 1702 1703 memcpy(ptr, from, len); 1704 1705 if (flags & BPF_F_RECOMPUTE_CSUM) 1706 __skb_postpush_rcsum(skb, ptr, len, offset); 1707 if (flags & BPF_F_INVALIDATE_HASH) 1708 skb_clear_hash(skb); 1709 1710 return 0; 1711 } 1712 1713 static const struct bpf_func_proto bpf_skb_store_bytes_proto = { 1714 .func = bpf_skb_store_bytes, 1715 .gpl_only = false, 1716 .ret_type = RET_INTEGER, 1717 .arg1_type = ARG_PTR_TO_CTX, 1718 .arg2_type = ARG_ANYTHING, 1719 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 1720 .arg4_type = ARG_CONST_SIZE, 1721 .arg5_type = ARG_ANYTHING, 1722 }; 1723 1724 int __bpf_skb_store_bytes(struct sk_buff *skb, u32 offset, const void *from, 1725 u32 len, u64 flags) 1726 { 1727 return ____bpf_skb_store_bytes(skb, offset, from, len, flags); 1728 } 1729 1730 BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset, 1731 void *, to, u32, len) 1732 { 1733 void *ptr; 1734 1735 if (unlikely(offset > INT_MAX)) 1736 goto err_clear; 1737 1738 ptr = skb_header_pointer(skb, offset, len, to); 1739 if (unlikely(!ptr)) 1740 goto err_clear; 1741 if (ptr != to) 1742 memcpy(to, ptr, len); 1743 1744 return 0; 1745 err_clear: 1746 memset(to, 0, len); 1747 return -EFAULT; 1748 } 1749 1750 static const struct bpf_func_proto bpf_skb_load_bytes_proto = { 1751 .func = bpf_skb_load_bytes, 1752 .gpl_only = false, 1753 .ret_type = RET_INTEGER, 1754 .arg1_type = ARG_PTR_TO_CTX, 1755 .arg2_type = ARG_ANYTHING, 1756 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1757 .arg4_type = ARG_CONST_SIZE, 1758 }; 1759 1760 int __bpf_skb_load_bytes(const struct sk_buff *skb, u32 offset, void *to, u32 len) 1761 { 1762 return ____bpf_skb_load_bytes(skb, offset, to, len); 1763 } 1764 1765 BPF_CALL_4(bpf_flow_dissector_load_bytes, 1766 const struct bpf_flow_dissector *, ctx, u32, offset, 1767 void *, to, u32, len) 1768 { 1769 void *ptr; 1770 1771 if (unlikely(offset > 0xffff)) 1772 goto err_clear; 1773 1774 if (unlikely(!ctx->skb)) 1775 goto err_clear; 1776 1777 ptr = skb_header_pointer(ctx->skb, offset, len, to); 1778 if (unlikely(!ptr)) 1779 goto err_clear; 1780 if (ptr != to) 1781 memcpy(to, ptr, len); 1782 1783 return 0; 1784 err_clear: 1785 memset(to, 0, len); 1786 return -EFAULT; 1787 } 1788 1789 static const struct bpf_func_proto bpf_flow_dissector_load_bytes_proto = { 1790 .func = bpf_flow_dissector_load_bytes, 1791 .gpl_only = false, 1792 .ret_type = RET_INTEGER, 1793 .arg1_type = ARG_PTR_TO_CTX, 1794 .arg2_type = ARG_ANYTHING, 1795 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1796 .arg4_type = ARG_CONST_SIZE, 1797 }; 1798 1799 BPF_CALL_5(bpf_skb_load_bytes_relative, const struct sk_buff *, skb, 1800 u32, offset, void *, to, u32, len, u32, start_header) 1801 { 1802 u8 *end = skb_tail_pointer(skb); 1803 u8 *start, *ptr; 1804 1805 if (unlikely(offset > 0xffff)) 1806 goto err_clear; 1807 1808 switch (start_header) { 1809 case BPF_HDR_START_MAC: 1810 if (unlikely(!skb_mac_header_was_set(skb))) 1811 goto err_clear; 1812 start = skb_mac_header(skb); 1813 break; 1814 case BPF_HDR_START_NET: 1815 start = skb_network_header(skb); 1816 break; 1817 default: 1818 goto err_clear; 1819 } 1820 1821 ptr = start + offset; 1822 1823 if (likely(ptr + len <= end)) { 1824 memcpy(to, ptr, len); 1825 return 0; 1826 } 1827 1828 err_clear: 1829 memset(to, 0, len); 1830 return -EFAULT; 1831 } 1832 1833 static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto = { 1834 .func = bpf_skb_load_bytes_relative, 1835 .gpl_only = false, 1836 .ret_type = RET_INTEGER, 1837 .arg1_type = ARG_PTR_TO_CTX, 1838 .arg2_type = ARG_ANYTHING, 1839 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1840 .arg4_type = ARG_CONST_SIZE, 1841 .arg5_type = ARG_ANYTHING, 1842 }; 1843 1844 BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len) 1845 { 1846 /* Idea is the following: should the needed direct read/write 1847 * test fail during runtime, we can pull in more data and redo 1848 * again, since implicitly, we invalidate previous checks here. 1849 * 1850 * Or, since we know how much we need to make read/writeable, 1851 * this can be done once at the program beginning for direct 1852 * access case. By this we overcome limitations of only current 1853 * headroom being accessible. 1854 */ 1855 return bpf_try_make_writable(skb, len ? : skb_headlen(skb)); 1856 } 1857 1858 static const struct bpf_func_proto bpf_skb_pull_data_proto = { 1859 .func = bpf_skb_pull_data, 1860 .gpl_only = false, 1861 .ret_type = RET_INTEGER, 1862 .arg1_type = ARG_PTR_TO_CTX, 1863 .arg2_type = ARG_ANYTHING, 1864 }; 1865 1866 BPF_CALL_1(bpf_sk_fullsock, struct sock *, sk) 1867 { 1868 return sk_fullsock(sk) ? (unsigned long)sk : (unsigned long)NULL; 1869 } 1870 1871 static const struct bpf_func_proto bpf_sk_fullsock_proto = { 1872 .func = bpf_sk_fullsock, 1873 .gpl_only = false, 1874 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 1875 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 1876 }; 1877 1878 static inline int sk_skb_try_make_writable(struct sk_buff *skb, 1879 unsigned int write_len) 1880 { 1881 return __bpf_try_make_writable(skb, write_len); 1882 } 1883 1884 BPF_CALL_2(sk_skb_pull_data, struct sk_buff *, skb, u32, len) 1885 { 1886 /* Idea is the following: should the needed direct read/write 1887 * test fail during runtime, we can pull in more data and redo 1888 * again, since implicitly, we invalidate previous checks here. 1889 * 1890 * Or, since we know how much we need to make read/writeable, 1891 * this can be done once at the program beginning for direct 1892 * access case. By this we overcome limitations of only current 1893 * headroom being accessible. 1894 */ 1895 return sk_skb_try_make_writable(skb, len ? : skb_headlen(skb)); 1896 } 1897 1898 static const struct bpf_func_proto sk_skb_pull_data_proto = { 1899 .func = sk_skb_pull_data, 1900 .gpl_only = false, 1901 .ret_type = RET_INTEGER, 1902 .arg1_type = ARG_PTR_TO_CTX, 1903 .arg2_type = ARG_ANYTHING, 1904 }; 1905 1906 BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset, 1907 u64, from, u64, to, u64, flags) 1908 { 1909 __sum16 *ptr; 1910 1911 if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK))) 1912 return -EINVAL; 1913 if (unlikely(offset > 0xffff || offset & 1)) 1914 return -EFAULT; 1915 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) 1916 return -EFAULT; 1917 1918 ptr = (__sum16 *)(skb->data + offset); 1919 switch (flags & BPF_F_HDR_FIELD_MASK) { 1920 case 0: 1921 if (unlikely(from != 0)) 1922 return -EINVAL; 1923 1924 csum_replace_by_diff(ptr, to); 1925 break; 1926 case 2: 1927 csum_replace2(ptr, from, to); 1928 break; 1929 case 4: 1930 csum_replace4(ptr, from, to); 1931 break; 1932 default: 1933 return -EINVAL; 1934 } 1935 1936 return 0; 1937 } 1938 1939 static const struct bpf_func_proto bpf_l3_csum_replace_proto = { 1940 .func = bpf_l3_csum_replace, 1941 .gpl_only = false, 1942 .ret_type = RET_INTEGER, 1943 .arg1_type = ARG_PTR_TO_CTX, 1944 .arg2_type = ARG_ANYTHING, 1945 .arg3_type = ARG_ANYTHING, 1946 .arg4_type = ARG_ANYTHING, 1947 .arg5_type = ARG_ANYTHING, 1948 }; 1949 1950 BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset, 1951 u64, from, u64, to, u64, flags) 1952 { 1953 bool is_pseudo = flags & BPF_F_PSEUDO_HDR; 1954 bool is_mmzero = flags & BPF_F_MARK_MANGLED_0; 1955 bool do_mforce = flags & BPF_F_MARK_ENFORCE; 1956 __sum16 *ptr; 1957 1958 if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE | 1959 BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK))) 1960 return -EINVAL; 1961 if (unlikely(offset > 0xffff || offset & 1)) 1962 return -EFAULT; 1963 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) 1964 return -EFAULT; 1965 1966 ptr = (__sum16 *)(skb->data + offset); 1967 if (is_mmzero && !do_mforce && !*ptr) 1968 return 0; 1969 1970 switch (flags & BPF_F_HDR_FIELD_MASK) { 1971 case 0: 1972 if (unlikely(from != 0)) 1973 return -EINVAL; 1974 1975 inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo); 1976 break; 1977 case 2: 1978 inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo); 1979 break; 1980 case 4: 1981 inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo); 1982 break; 1983 default: 1984 return -EINVAL; 1985 } 1986 1987 if (is_mmzero && !*ptr) 1988 *ptr = CSUM_MANGLED_0; 1989 return 0; 1990 } 1991 1992 static const struct bpf_func_proto bpf_l4_csum_replace_proto = { 1993 .func = bpf_l4_csum_replace, 1994 .gpl_only = false, 1995 .ret_type = RET_INTEGER, 1996 .arg1_type = ARG_PTR_TO_CTX, 1997 .arg2_type = ARG_ANYTHING, 1998 .arg3_type = ARG_ANYTHING, 1999 .arg4_type = ARG_ANYTHING, 2000 .arg5_type = ARG_ANYTHING, 2001 }; 2002 2003 BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size, 2004 __be32 *, to, u32, to_size, __wsum, seed) 2005 { 2006 struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp); 2007 u32 diff_size = from_size + to_size; 2008 int i, j = 0; 2009 2010 /* This is quite flexible, some examples: 2011 * 2012 * from_size == 0, to_size > 0, seed := csum --> pushing data 2013 * from_size > 0, to_size == 0, seed := csum --> pulling data 2014 * from_size > 0, to_size > 0, seed := 0 --> diffing data 2015 * 2016 * Even for diffing, from_size and to_size don't need to be equal. 2017 */ 2018 if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) || 2019 diff_size > sizeof(sp->diff))) 2020 return -EINVAL; 2021 2022 for (i = 0; i < from_size / sizeof(__be32); i++, j++) 2023 sp->diff[j] = ~from[i]; 2024 for (i = 0; i < to_size / sizeof(__be32); i++, j++) 2025 sp->diff[j] = to[i]; 2026 2027 return csum_partial(sp->diff, diff_size, seed); 2028 } 2029 2030 static const struct bpf_func_proto bpf_csum_diff_proto = { 2031 .func = bpf_csum_diff, 2032 .gpl_only = false, 2033 .pkt_access = true, 2034 .ret_type = RET_INTEGER, 2035 .arg1_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY, 2036 .arg2_type = ARG_CONST_SIZE_OR_ZERO, 2037 .arg3_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY, 2038 .arg4_type = ARG_CONST_SIZE_OR_ZERO, 2039 .arg5_type = ARG_ANYTHING, 2040 }; 2041 2042 BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum) 2043 { 2044 /* The interface is to be used in combination with bpf_csum_diff() 2045 * for direct packet writes. csum rotation for alignment as well 2046 * as emulating csum_sub() can be done from the eBPF program. 2047 */ 2048 if (skb->ip_summed == CHECKSUM_COMPLETE) 2049 return (skb->csum = csum_add(skb->csum, csum)); 2050 2051 return -ENOTSUPP; 2052 } 2053 2054 static const struct bpf_func_proto bpf_csum_update_proto = { 2055 .func = bpf_csum_update, 2056 .gpl_only = false, 2057 .ret_type = RET_INTEGER, 2058 .arg1_type = ARG_PTR_TO_CTX, 2059 .arg2_type = ARG_ANYTHING, 2060 }; 2061 2062 BPF_CALL_2(bpf_csum_level, struct sk_buff *, skb, u64, level) 2063 { 2064 /* The interface is to be used in combination with bpf_skb_adjust_room() 2065 * for encap/decap of packet headers when BPF_F_ADJ_ROOM_NO_CSUM_RESET 2066 * is passed as flags, for example. 2067 */ 2068 switch (level) { 2069 case BPF_CSUM_LEVEL_INC: 2070 __skb_incr_checksum_unnecessary(skb); 2071 break; 2072 case BPF_CSUM_LEVEL_DEC: 2073 __skb_decr_checksum_unnecessary(skb); 2074 break; 2075 case BPF_CSUM_LEVEL_RESET: 2076 __skb_reset_checksum_unnecessary(skb); 2077 break; 2078 case BPF_CSUM_LEVEL_QUERY: 2079 return skb->ip_summed == CHECKSUM_UNNECESSARY ? 2080 skb->csum_level : -EACCES; 2081 default: 2082 return -EINVAL; 2083 } 2084 2085 return 0; 2086 } 2087 2088 static const struct bpf_func_proto bpf_csum_level_proto = { 2089 .func = bpf_csum_level, 2090 .gpl_only = false, 2091 .ret_type = RET_INTEGER, 2092 .arg1_type = ARG_PTR_TO_CTX, 2093 .arg2_type = ARG_ANYTHING, 2094 }; 2095 2096 static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb) 2097 { 2098 return dev_forward_skb_nomtu(dev, skb); 2099 } 2100 2101 static inline int __bpf_rx_skb_no_mac(struct net_device *dev, 2102 struct sk_buff *skb) 2103 { 2104 int ret = ____dev_forward_skb(dev, skb, false); 2105 2106 if (likely(!ret)) { 2107 skb->dev = dev; 2108 ret = netif_rx(skb); 2109 } 2110 2111 return ret; 2112 } 2113 2114 static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb) 2115 { 2116 int ret; 2117 2118 if (dev_xmit_recursion()) { 2119 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); 2120 kfree_skb(skb); 2121 return -ENETDOWN; 2122 } 2123 2124 skb->dev = dev; 2125 skb_set_redirected_noclear(skb, skb_at_tc_ingress(skb)); 2126 skb_clear_tstamp(skb); 2127 2128 dev_xmit_recursion_inc(); 2129 ret = dev_queue_xmit(skb); 2130 dev_xmit_recursion_dec(); 2131 2132 return ret; 2133 } 2134 2135 static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev, 2136 u32 flags) 2137 { 2138 unsigned int mlen = skb_network_offset(skb); 2139 2140 if (unlikely(skb->len <= mlen)) { 2141 kfree_skb(skb); 2142 return -ERANGE; 2143 } 2144 2145 if (mlen) { 2146 __skb_pull(skb, mlen); 2147 2148 /* At ingress, the mac header has already been pulled once. 2149 * At egress, skb_pospull_rcsum has to be done in case that 2150 * the skb is originated from ingress (i.e. a forwarded skb) 2151 * to ensure that rcsum starts at net header. 2152 */ 2153 if (!skb_at_tc_ingress(skb)) 2154 skb_postpull_rcsum(skb, skb_mac_header(skb), mlen); 2155 } 2156 skb_pop_mac_header(skb); 2157 skb_reset_mac_len(skb); 2158 return flags & BPF_F_INGRESS ? 2159 __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb); 2160 } 2161 2162 static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev, 2163 u32 flags) 2164 { 2165 /* Verify that a link layer header is carried */ 2166 if (unlikely(skb->mac_header >= skb->network_header || skb->len == 0)) { 2167 kfree_skb(skb); 2168 return -ERANGE; 2169 } 2170 2171 bpf_push_mac_rcsum(skb); 2172 return flags & BPF_F_INGRESS ? 2173 __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb); 2174 } 2175 2176 static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev, 2177 u32 flags) 2178 { 2179 if (dev_is_mac_header_xmit(dev)) 2180 return __bpf_redirect_common(skb, dev, flags); 2181 else 2182 return __bpf_redirect_no_mac(skb, dev, flags); 2183 } 2184 2185 #if IS_ENABLED(CONFIG_IPV6) 2186 static int bpf_out_neigh_v6(struct net *net, struct sk_buff *skb, 2187 struct net_device *dev, struct bpf_nh_params *nh) 2188 { 2189 u32 hh_len = LL_RESERVED_SPACE(dev); 2190 const struct in6_addr *nexthop; 2191 struct dst_entry *dst = NULL; 2192 struct neighbour *neigh; 2193 2194 if (dev_xmit_recursion()) { 2195 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); 2196 goto out_drop; 2197 } 2198 2199 skb->dev = dev; 2200 skb_clear_tstamp(skb); 2201 2202 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { 2203 skb = skb_expand_head(skb, hh_len); 2204 if (!skb) 2205 return -ENOMEM; 2206 } 2207 2208 rcu_read_lock(); 2209 if (!nh) { 2210 dst = skb_dst(skb); 2211 nexthop = rt6_nexthop(container_of(dst, struct rt6_info, dst), 2212 &ipv6_hdr(skb)->daddr); 2213 } else { 2214 nexthop = &nh->ipv6_nh; 2215 } 2216 neigh = ip_neigh_gw6(dev, nexthop); 2217 if (likely(!IS_ERR(neigh))) { 2218 int ret; 2219 2220 sock_confirm_neigh(skb, neigh); 2221 local_bh_disable(); 2222 dev_xmit_recursion_inc(); 2223 ret = neigh_output(neigh, skb, false); 2224 dev_xmit_recursion_dec(); 2225 local_bh_enable(); 2226 rcu_read_unlock(); 2227 return ret; 2228 } 2229 rcu_read_unlock_bh(); 2230 if (dst) 2231 IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); 2232 out_drop: 2233 kfree_skb(skb); 2234 return -ENETDOWN; 2235 } 2236 2237 static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev, 2238 struct bpf_nh_params *nh) 2239 { 2240 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 2241 struct net *net = dev_net(dev); 2242 int err, ret = NET_XMIT_DROP; 2243 2244 if (!nh) { 2245 struct dst_entry *dst; 2246 struct flowi6 fl6 = { 2247 .flowi6_flags = FLOWI_FLAG_ANYSRC, 2248 .flowi6_mark = skb->mark, 2249 .flowlabel = ip6_flowinfo(ip6h), 2250 .flowi6_oif = dev->ifindex, 2251 .flowi6_proto = ip6h->nexthdr, 2252 .daddr = ip6h->daddr, 2253 .saddr = ip6h->saddr, 2254 }; 2255 2256 dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL); 2257 if (IS_ERR(dst)) 2258 goto out_drop; 2259 2260 skb_dst_set(skb, dst); 2261 } else if (nh->nh_family != AF_INET6) { 2262 goto out_drop; 2263 } 2264 2265 err = bpf_out_neigh_v6(net, skb, dev, nh); 2266 if (unlikely(net_xmit_eval(err))) 2267 dev->stats.tx_errors++; 2268 else 2269 ret = NET_XMIT_SUCCESS; 2270 goto out_xmit; 2271 out_drop: 2272 dev->stats.tx_errors++; 2273 kfree_skb(skb); 2274 out_xmit: 2275 return ret; 2276 } 2277 #else 2278 static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev, 2279 struct bpf_nh_params *nh) 2280 { 2281 kfree_skb(skb); 2282 return NET_XMIT_DROP; 2283 } 2284 #endif /* CONFIG_IPV6 */ 2285 2286 #if IS_ENABLED(CONFIG_INET) 2287 static int bpf_out_neigh_v4(struct net *net, struct sk_buff *skb, 2288 struct net_device *dev, struct bpf_nh_params *nh) 2289 { 2290 u32 hh_len = LL_RESERVED_SPACE(dev); 2291 struct neighbour *neigh; 2292 bool is_v6gw = false; 2293 2294 if (dev_xmit_recursion()) { 2295 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); 2296 goto out_drop; 2297 } 2298 2299 skb->dev = dev; 2300 skb_clear_tstamp(skb); 2301 2302 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { 2303 skb = skb_expand_head(skb, hh_len); 2304 if (!skb) 2305 return -ENOMEM; 2306 } 2307 2308 rcu_read_lock(); 2309 if (!nh) { 2310 struct dst_entry *dst = skb_dst(skb); 2311 struct rtable *rt = container_of(dst, struct rtable, dst); 2312 2313 neigh = ip_neigh_for_gw(rt, skb, &is_v6gw); 2314 } else if (nh->nh_family == AF_INET6) { 2315 neigh = ip_neigh_gw6(dev, &nh->ipv6_nh); 2316 is_v6gw = true; 2317 } else if (nh->nh_family == AF_INET) { 2318 neigh = ip_neigh_gw4(dev, nh->ipv4_nh); 2319 } else { 2320 rcu_read_unlock(); 2321 goto out_drop; 2322 } 2323 2324 if (likely(!IS_ERR(neigh))) { 2325 int ret; 2326 2327 sock_confirm_neigh(skb, neigh); 2328 local_bh_disable(); 2329 dev_xmit_recursion_inc(); 2330 ret = neigh_output(neigh, skb, is_v6gw); 2331 dev_xmit_recursion_dec(); 2332 local_bh_enable(); 2333 rcu_read_unlock(); 2334 return ret; 2335 } 2336 rcu_read_unlock(); 2337 out_drop: 2338 kfree_skb(skb); 2339 return -ENETDOWN; 2340 } 2341 2342 static int __bpf_redirect_neigh_v4(struct sk_buff *skb, struct net_device *dev, 2343 struct bpf_nh_params *nh) 2344 { 2345 const struct iphdr *ip4h = ip_hdr(skb); 2346 struct net *net = dev_net(dev); 2347 int err, ret = NET_XMIT_DROP; 2348 2349 if (!nh) { 2350 struct flowi4 fl4 = { 2351 .flowi4_flags = FLOWI_FLAG_ANYSRC, 2352 .flowi4_mark = skb->mark, 2353 .flowi4_tos = RT_TOS(ip4h->tos), 2354 .flowi4_oif = dev->ifindex, 2355 .flowi4_proto = ip4h->protocol, 2356 .daddr = ip4h->daddr, 2357 .saddr = ip4h->saddr, 2358 }; 2359 struct rtable *rt; 2360 2361 rt = ip_route_output_flow(net, &fl4, NULL); 2362 if (IS_ERR(rt)) 2363 goto out_drop; 2364 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { 2365 ip_rt_put(rt); 2366 goto out_drop; 2367 } 2368 2369 skb_dst_set(skb, &rt->dst); 2370 } 2371 2372 err = bpf_out_neigh_v4(net, skb, dev, nh); 2373 if (unlikely(net_xmit_eval(err))) 2374 dev->stats.tx_errors++; 2375 else 2376 ret = NET_XMIT_SUCCESS; 2377 goto out_xmit; 2378 out_drop: 2379 dev->stats.tx_errors++; 2380 kfree_skb(skb); 2381 out_xmit: 2382 return ret; 2383 } 2384 #else 2385 static int __bpf_redirect_neigh_v4(struct sk_buff *skb, struct net_device *dev, 2386 struct bpf_nh_params *nh) 2387 { 2388 kfree_skb(skb); 2389 return NET_XMIT_DROP; 2390 } 2391 #endif /* CONFIG_INET */ 2392 2393 static int __bpf_redirect_neigh(struct sk_buff *skb, struct net_device *dev, 2394 struct bpf_nh_params *nh) 2395 { 2396 struct ethhdr *ethh = eth_hdr(skb); 2397 2398 if (unlikely(skb->mac_header >= skb->network_header)) 2399 goto out; 2400 bpf_push_mac_rcsum(skb); 2401 if (is_multicast_ether_addr(ethh->h_dest)) 2402 goto out; 2403 2404 skb_pull(skb, sizeof(*ethh)); 2405 skb_unset_mac_header(skb); 2406 skb_reset_network_header(skb); 2407 2408 if (skb->protocol == htons(ETH_P_IP)) 2409 return __bpf_redirect_neigh_v4(skb, dev, nh); 2410 else if (skb->protocol == htons(ETH_P_IPV6)) 2411 return __bpf_redirect_neigh_v6(skb, dev, nh); 2412 out: 2413 kfree_skb(skb); 2414 return -ENOTSUPP; 2415 } 2416 2417 /* Internal, non-exposed redirect flags. */ 2418 enum { 2419 BPF_F_NEIGH = (1ULL << 1), 2420 BPF_F_PEER = (1ULL << 2), 2421 BPF_F_NEXTHOP = (1ULL << 3), 2422 #define BPF_F_REDIRECT_INTERNAL (BPF_F_NEIGH | BPF_F_PEER | BPF_F_NEXTHOP) 2423 }; 2424 2425 BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags) 2426 { 2427 struct net_device *dev; 2428 struct sk_buff *clone; 2429 int ret; 2430 2431 if (unlikely(flags & (~(BPF_F_INGRESS) | BPF_F_REDIRECT_INTERNAL))) 2432 return -EINVAL; 2433 2434 dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex); 2435 if (unlikely(!dev)) 2436 return -EINVAL; 2437 2438 clone = skb_clone(skb, GFP_ATOMIC); 2439 if (unlikely(!clone)) 2440 return -ENOMEM; 2441 2442 /* For direct write, we need to keep the invariant that the skbs 2443 * we're dealing with need to be uncloned. Should uncloning fail 2444 * here, we need to free the just generated clone to unclone once 2445 * again. 2446 */ 2447 ret = bpf_try_make_head_writable(skb); 2448 if (unlikely(ret)) { 2449 kfree_skb(clone); 2450 return -ENOMEM; 2451 } 2452 2453 return __bpf_redirect(clone, dev, flags); 2454 } 2455 2456 static const struct bpf_func_proto bpf_clone_redirect_proto = { 2457 .func = bpf_clone_redirect, 2458 .gpl_only = false, 2459 .ret_type = RET_INTEGER, 2460 .arg1_type = ARG_PTR_TO_CTX, 2461 .arg2_type = ARG_ANYTHING, 2462 .arg3_type = ARG_ANYTHING, 2463 }; 2464 2465 DEFINE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info); 2466 EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info); 2467 2468 int skb_do_redirect(struct sk_buff *skb) 2469 { 2470 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2471 struct net *net = dev_net(skb->dev); 2472 struct net_device *dev; 2473 u32 flags = ri->flags; 2474 2475 dev = dev_get_by_index_rcu(net, ri->tgt_index); 2476 ri->tgt_index = 0; 2477 ri->flags = 0; 2478 if (unlikely(!dev)) 2479 goto out_drop; 2480 if (flags & BPF_F_PEER) { 2481 const struct net_device_ops *ops = dev->netdev_ops; 2482 2483 if (unlikely(!ops->ndo_get_peer_dev || 2484 !skb_at_tc_ingress(skb))) 2485 goto out_drop; 2486 dev = ops->ndo_get_peer_dev(dev); 2487 if (unlikely(!dev || 2488 !(dev->flags & IFF_UP) || 2489 net_eq(net, dev_net(dev)))) 2490 goto out_drop; 2491 skb->dev = dev; 2492 return -EAGAIN; 2493 } 2494 return flags & BPF_F_NEIGH ? 2495 __bpf_redirect_neigh(skb, dev, flags & BPF_F_NEXTHOP ? 2496 &ri->nh : NULL) : 2497 __bpf_redirect(skb, dev, flags); 2498 out_drop: 2499 kfree_skb(skb); 2500 return -EINVAL; 2501 } 2502 2503 BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags) 2504 { 2505 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2506 2507 if (unlikely(flags & (~(BPF_F_INGRESS) | BPF_F_REDIRECT_INTERNAL))) 2508 return TC_ACT_SHOT; 2509 2510 ri->flags = flags; 2511 ri->tgt_index = ifindex; 2512 2513 return TC_ACT_REDIRECT; 2514 } 2515 2516 static const struct bpf_func_proto bpf_redirect_proto = { 2517 .func = bpf_redirect, 2518 .gpl_only = false, 2519 .ret_type = RET_INTEGER, 2520 .arg1_type = ARG_ANYTHING, 2521 .arg2_type = ARG_ANYTHING, 2522 }; 2523 2524 BPF_CALL_2(bpf_redirect_peer, u32, ifindex, u64, flags) 2525 { 2526 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2527 2528 if (unlikely(flags)) 2529 return TC_ACT_SHOT; 2530 2531 ri->flags = BPF_F_PEER; 2532 ri->tgt_index = ifindex; 2533 2534 return TC_ACT_REDIRECT; 2535 } 2536 2537 static const struct bpf_func_proto bpf_redirect_peer_proto = { 2538 .func = bpf_redirect_peer, 2539 .gpl_only = false, 2540 .ret_type = RET_INTEGER, 2541 .arg1_type = ARG_ANYTHING, 2542 .arg2_type = ARG_ANYTHING, 2543 }; 2544 2545 BPF_CALL_4(bpf_redirect_neigh, u32, ifindex, struct bpf_redir_neigh *, params, 2546 int, plen, u64, flags) 2547 { 2548 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2549 2550 if (unlikely((plen && plen < sizeof(*params)) || flags)) 2551 return TC_ACT_SHOT; 2552 2553 ri->flags = BPF_F_NEIGH | (plen ? BPF_F_NEXTHOP : 0); 2554 ri->tgt_index = ifindex; 2555 2556 BUILD_BUG_ON(sizeof(struct bpf_redir_neigh) != sizeof(struct bpf_nh_params)); 2557 if (plen) 2558 memcpy(&ri->nh, params, sizeof(ri->nh)); 2559 2560 return TC_ACT_REDIRECT; 2561 } 2562 2563 static const struct bpf_func_proto bpf_redirect_neigh_proto = { 2564 .func = bpf_redirect_neigh, 2565 .gpl_only = false, 2566 .ret_type = RET_INTEGER, 2567 .arg1_type = ARG_ANYTHING, 2568 .arg2_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY, 2569 .arg3_type = ARG_CONST_SIZE_OR_ZERO, 2570 .arg4_type = ARG_ANYTHING, 2571 }; 2572 2573 BPF_CALL_2(bpf_msg_apply_bytes, struct sk_msg *, msg, u32, bytes) 2574 { 2575 msg->apply_bytes = bytes; 2576 return 0; 2577 } 2578 2579 static const struct bpf_func_proto bpf_msg_apply_bytes_proto = { 2580 .func = bpf_msg_apply_bytes, 2581 .gpl_only = false, 2582 .ret_type = RET_INTEGER, 2583 .arg1_type = ARG_PTR_TO_CTX, 2584 .arg2_type = ARG_ANYTHING, 2585 }; 2586 2587 BPF_CALL_2(bpf_msg_cork_bytes, struct sk_msg *, msg, u32, bytes) 2588 { 2589 msg->cork_bytes = bytes; 2590 return 0; 2591 } 2592 2593 static const struct bpf_func_proto bpf_msg_cork_bytes_proto = { 2594 .func = bpf_msg_cork_bytes, 2595 .gpl_only = false, 2596 .ret_type = RET_INTEGER, 2597 .arg1_type = ARG_PTR_TO_CTX, 2598 .arg2_type = ARG_ANYTHING, 2599 }; 2600 2601 BPF_CALL_4(bpf_msg_pull_data, struct sk_msg *, msg, u32, start, 2602 u32, end, u64, flags) 2603 { 2604 u32 len = 0, offset = 0, copy = 0, poffset = 0, bytes = end - start; 2605 u32 first_sge, last_sge, i, shift, bytes_sg_total; 2606 struct scatterlist *sge; 2607 u8 *raw, *to, *from; 2608 struct page *page; 2609 2610 if (unlikely(flags || end <= start)) 2611 return -EINVAL; 2612 2613 /* First find the starting scatterlist element */ 2614 i = msg->sg.start; 2615 do { 2616 offset += len; 2617 len = sk_msg_elem(msg, i)->length; 2618 if (start < offset + len) 2619 break; 2620 sk_msg_iter_var_next(i); 2621 } while (i != msg->sg.end); 2622 2623 if (unlikely(start >= offset + len)) 2624 return -EINVAL; 2625 2626 first_sge = i; 2627 /* The start may point into the sg element so we need to also 2628 * account for the headroom. 2629 */ 2630 bytes_sg_total = start - offset + bytes; 2631 if (!test_bit(i, msg->sg.copy) && bytes_sg_total <= len) 2632 goto out; 2633 2634 /* At this point we need to linearize multiple scatterlist 2635 * elements or a single shared page. Either way we need to 2636 * copy into a linear buffer exclusively owned by BPF. Then 2637 * place the buffer in the scatterlist and fixup the original 2638 * entries by removing the entries now in the linear buffer 2639 * and shifting the remaining entries. For now we do not try 2640 * to copy partial entries to avoid complexity of running out 2641 * of sg_entry slots. The downside is reading a single byte 2642 * will copy the entire sg entry. 2643 */ 2644 do { 2645 copy += sk_msg_elem(msg, i)->length; 2646 sk_msg_iter_var_next(i); 2647 if (bytes_sg_total <= copy) 2648 break; 2649 } while (i != msg->sg.end); 2650 last_sge = i; 2651 2652 if (unlikely(bytes_sg_total > copy)) 2653 return -EINVAL; 2654 2655 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, 2656 get_order(copy)); 2657 if (unlikely(!page)) 2658 return -ENOMEM; 2659 2660 raw = page_address(page); 2661 i = first_sge; 2662 do { 2663 sge = sk_msg_elem(msg, i); 2664 from = sg_virt(sge); 2665 len = sge->length; 2666 to = raw + poffset; 2667 2668 memcpy(to, from, len); 2669 poffset += len; 2670 sge->length = 0; 2671 put_page(sg_page(sge)); 2672 2673 sk_msg_iter_var_next(i); 2674 } while (i != last_sge); 2675 2676 sg_set_page(&msg->sg.data[first_sge], page, copy, 0); 2677 2678 /* To repair sg ring we need to shift entries. If we only 2679 * had a single entry though we can just replace it and 2680 * be done. Otherwise walk the ring and shift the entries. 2681 */ 2682 WARN_ON_ONCE(last_sge == first_sge); 2683 shift = last_sge > first_sge ? 2684 last_sge - first_sge - 1 : 2685 NR_MSG_FRAG_IDS - first_sge + last_sge - 1; 2686 if (!shift) 2687 goto out; 2688 2689 i = first_sge; 2690 sk_msg_iter_var_next(i); 2691 do { 2692 u32 move_from; 2693 2694 if (i + shift >= NR_MSG_FRAG_IDS) 2695 move_from = i + shift - NR_MSG_FRAG_IDS; 2696 else 2697 move_from = i + shift; 2698 if (move_from == msg->sg.end) 2699 break; 2700 2701 msg->sg.data[i] = msg->sg.data[move_from]; 2702 msg->sg.data[move_from].length = 0; 2703 msg->sg.data[move_from].page_link = 0; 2704 msg->sg.data[move_from].offset = 0; 2705 sk_msg_iter_var_next(i); 2706 } while (1); 2707 2708 msg->sg.end = msg->sg.end - shift > msg->sg.end ? 2709 msg->sg.end - shift + NR_MSG_FRAG_IDS : 2710 msg->sg.end - shift; 2711 out: 2712 msg->data = sg_virt(&msg->sg.data[first_sge]) + start - offset; 2713 msg->data_end = msg->data + bytes; 2714 return 0; 2715 } 2716 2717 static const struct bpf_func_proto bpf_msg_pull_data_proto = { 2718 .func = bpf_msg_pull_data, 2719 .gpl_only = false, 2720 .ret_type = RET_INTEGER, 2721 .arg1_type = ARG_PTR_TO_CTX, 2722 .arg2_type = ARG_ANYTHING, 2723 .arg3_type = ARG_ANYTHING, 2724 .arg4_type = ARG_ANYTHING, 2725 }; 2726 2727 BPF_CALL_4(bpf_msg_push_data, struct sk_msg *, msg, u32, start, 2728 u32, len, u64, flags) 2729 { 2730 struct scatterlist sge, nsge, nnsge, rsge = {0}, *psge; 2731 u32 new, i = 0, l = 0, space, copy = 0, offset = 0; 2732 u8 *raw, *to, *from; 2733 struct page *page; 2734 2735 if (unlikely(flags)) 2736 return -EINVAL; 2737 2738 if (unlikely(len == 0)) 2739 return 0; 2740 2741 /* First find the starting scatterlist element */ 2742 i = msg->sg.start; 2743 do { 2744 offset += l; 2745 l = sk_msg_elem(msg, i)->length; 2746 2747 if (start < offset + l) 2748 break; 2749 sk_msg_iter_var_next(i); 2750 } while (i != msg->sg.end); 2751 2752 if (start >= offset + l) 2753 return -EINVAL; 2754 2755 space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); 2756 2757 /* If no space available will fallback to copy, we need at 2758 * least one scatterlist elem available to push data into 2759 * when start aligns to the beginning of an element or two 2760 * when it falls inside an element. We handle the start equals 2761 * offset case because its the common case for inserting a 2762 * header. 2763 */ 2764 if (!space || (space == 1 && start != offset)) 2765 copy = msg->sg.data[i].length; 2766 2767 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, 2768 get_order(copy + len)); 2769 if (unlikely(!page)) 2770 return -ENOMEM; 2771 2772 if (copy) { 2773 int front, back; 2774 2775 raw = page_address(page); 2776 2777 psge = sk_msg_elem(msg, i); 2778 front = start - offset; 2779 back = psge->length - front; 2780 from = sg_virt(psge); 2781 2782 if (front) 2783 memcpy(raw, from, front); 2784 2785 if (back) { 2786 from += front; 2787 to = raw + front + len; 2788 2789 memcpy(to, from, back); 2790 } 2791 2792 put_page(sg_page(psge)); 2793 } else if (start - offset) { 2794 psge = sk_msg_elem(msg, i); 2795 rsge = sk_msg_elem_cpy(msg, i); 2796 2797 psge->length = start - offset; 2798 rsge.length -= psge->length; 2799 rsge.offset += start; 2800 2801 sk_msg_iter_var_next(i); 2802 sg_unmark_end(psge); 2803 sg_unmark_end(&rsge); 2804 sk_msg_iter_next(msg, end); 2805 } 2806 2807 /* Slot(s) to place newly allocated data */ 2808 new = i; 2809 2810 /* Shift one or two slots as needed */ 2811 if (!copy) { 2812 sge = sk_msg_elem_cpy(msg, i); 2813 2814 sk_msg_iter_var_next(i); 2815 sg_unmark_end(&sge); 2816 sk_msg_iter_next(msg, end); 2817 2818 nsge = sk_msg_elem_cpy(msg, i); 2819 if (rsge.length) { 2820 sk_msg_iter_var_next(i); 2821 nnsge = sk_msg_elem_cpy(msg, i); 2822 } 2823 2824 while (i != msg->sg.end) { 2825 msg->sg.data[i] = sge; 2826 sge = nsge; 2827 sk_msg_iter_var_next(i); 2828 if (rsge.length) { 2829 nsge = nnsge; 2830 nnsge = sk_msg_elem_cpy(msg, i); 2831 } else { 2832 nsge = sk_msg_elem_cpy(msg, i); 2833 } 2834 } 2835 } 2836 2837 /* Place newly allocated data buffer */ 2838 sk_mem_charge(msg->sk, len); 2839 msg->sg.size += len; 2840 __clear_bit(new, msg->sg.copy); 2841 sg_set_page(&msg->sg.data[new], page, len + copy, 0); 2842 if (rsge.length) { 2843 get_page(sg_page(&rsge)); 2844 sk_msg_iter_var_next(new); 2845 msg->sg.data[new] = rsge; 2846 } 2847 2848 sk_msg_compute_data_pointers(msg); 2849 return 0; 2850 } 2851 2852 static const struct bpf_func_proto bpf_msg_push_data_proto = { 2853 .func = bpf_msg_push_data, 2854 .gpl_only = false, 2855 .ret_type = RET_INTEGER, 2856 .arg1_type = ARG_PTR_TO_CTX, 2857 .arg2_type = ARG_ANYTHING, 2858 .arg3_type = ARG_ANYTHING, 2859 .arg4_type = ARG_ANYTHING, 2860 }; 2861 2862 static void sk_msg_shift_left(struct sk_msg *msg, int i) 2863 { 2864 int prev; 2865 2866 do { 2867 prev = i; 2868 sk_msg_iter_var_next(i); 2869 msg->sg.data[prev] = msg->sg.data[i]; 2870 } while (i != msg->sg.end); 2871 2872 sk_msg_iter_prev(msg, end); 2873 } 2874 2875 static void sk_msg_shift_right(struct sk_msg *msg, int i) 2876 { 2877 struct scatterlist tmp, sge; 2878 2879 sk_msg_iter_next(msg, end); 2880 sge = sk_msg_elem_cpy(msg, i); 2881 sk_msg_iter_var_next(i); 2882 tmp = sk_msg_elem_cpy(msg, i); 2883 2884 while (i != msg->sg.end) { 2885 msg->sg.data[i] = sge; 2886 sk_msg_iter_var_next(i); 2887 sge = tmp; 2888 tmp = sk_msg_elem_cpy(msg, i); 2889 } 2890 } 2891 2892 BPF_CALL_4(bpf_msg_pop_data, struct sk_msg *, msg, u32, start, 2893 u32, len, u64, flags) 2894 { 2895 u32 i = 0, l = 0, space, offset = 0; 2896 u64 last = start + len; 2897 int pop; 2898 2899 if (unlikely(flags)) 2900 return -EINVAL; 2901 2902 /* First find the starting scatterlist element */ 2903 i = msg->sg.start; 2904 do { 2905 offset += l; 2906 l = sk_msg_elem(msg, i)->length; 2907 2908 if (start < offset + l) 2909 break; 2910 sk_msg_iter_var_next(i); 2911 } while (i != msg->sg.end); 2912 2913 /* Bounds checks: start and pop must be inside message */ 2914 if (start >= offset + l || last >= msg->sg.size) 2915 return -EINVAL; 2916 2917 space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); 2918 2919 pop = len; 2920 /* --------------| offset 2921 * -| start |-------- len -------| 2922 * 2923 * |----- a ----|-------- pop -------|----- b ----| 2924 * |______________________________________________| length 2925 * 2926 * 2927 * a: region at front of scatter element to save 2928 * b: region at back of scatter element to save when length > A + pop 2929 * pop: region to pop from element, same as input 'pop' here will be 2930 * decremented below per iteration. 2931 * 2932 * Two top-level cases to handle when start != offset, first B is non 2933 * zero and second B is zero corresponding to when a pop includes more 2934 * than one element. 2935 * 2936 * Then if B is non-zero AND there is no space allocate space and 2937 * compact A, B regions into page. If there is space shift ring to 2938 * the rigth free'ing the next element in ring to place B, leaving 2939 * A untouched except to reduce length. 2940 */ 2941 if (start != offset) { 2942 struct scatterlist *nsge, *sge = sk_msg_elem(msg, i); 2943 int a = start; 2944 int b = sge->length - pop - a; 2945 2946 sk_msg_iter_var_next(i); 2947 2948 if (pop < sge->length - a) { 2949 if (space) { 2950 sge->length = a; 2951 sk_msg_shift_right(msg, i); 2952 nsge = sk_msg_elem(msg, i); 2953 get_page(sg_page(sge)); 2954 sg_set_page(nsge, 2955 sg_page(sge), 2956 b, sge->offset + pop + a); 2957 } else { 2958 struct page *page, *orig; 2959 u8 *to, *from; 2960 2961 page = alloc_pages(__GFP_NOWARN | 2962 __GFP_COMP | GFP_ATOMIC, 2963 get_order(a + b)); 2964 if (unlikely(!page)) 2965 return -ENOMEM; 2966 2967 sge->length = a; 2968 orig = sg_page(sge); 2969 from = sg_virt(sge); 2970 to = page_address(page); 2971 memcpy(to, from, a); 2972 memcpy(to + a, from + a + pop, b); 2973 sg_set_page(sge, page, a + b, 0); 2974 put_page(orig); 2975 } 2976 pop = 0; 2977 } else if (pop >= sge->length - a) { 2978 pop -= (sge->length - a); 2979 sge->length = a; 2980 } 2981 } 2982 2983 /* From above the current layout _must_ be as follows, 2984 * 2985 * -| offset 2986 * -| start 2987 * 2988 * |---- pop ---|---------------- b ------------| 2989 * |____________________________________________| length 2990 * 2991 * Offset and start of the current msg elem are equal because in the 2992 * previous case we handled offset != start and either consumed the 2993 * entire element and advanced to the next element OR pop == 0. 2994 * 2995 * Two cases to handle here are first pop is less than the length 2996 * leaving some remainder b above. Simply adjust the element's layout 2997 * in this case. Or pop >= length of the element so that b = 0. In this 2998 * case advance to next element decrementing pop. 2999 */ 3000 while (pop) { 3001 struct scatterlist *sge = sk_msg_elem(msg, i); 3002 3003 if (pop < sge->length) { 3004 sge->length -= pop; 3005 sge->offset += pop; 3006 pop = 0; 3007 } else { 3008 pop -= sge->length; 3009 sk_msg_shift_left(msg, i); 3010 } 3011 sk_msg_iter_var_next(i); 3012 } 3013 3014 sk_mem_uncharge(msg->sk, len - pop); 3015 msg->sg.size -= (len - pop); 3016 sk_msg_compute_data_pointers(msg); 3017 return 0; 3018 } 3019 3020 static const struct bpf_func_proto bpf_msg_pop_data_proto = { 3021 .func = bpf_msg_pop_data, 3022 .gpl_only = false, 3023 .ret_type = RET_INTEGER, 3024 .arg1_type = ARG_PTR_TO_CTX, 3025 .arg2_type = ARG_ANYTHING, 3026 .arg3_type = ARG_ANYTHING, 3027 .arg4_type = ARG_ANYTHING, 3028 }; 3029 3030 #ifdef CONFIG_CGROUP_NET_CLASSID 3031 BPF_CALL_0(bpf_get_cgroup_classid_curr) 3032 { 3033 return __task_get_classid(current); 3034 } 3035 3036 const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto = { 3037 .func = bpf_get_cgroup_classid_curr, 3038 .gpl_only = false, 3039 .ret_type = RET_INTEGER, 3040 }; 3041 3042 BPF_CALL_1(bpf_skb_cgroup_classid, const struct sk_buff *, skb) 3043 { 3044 struct sock *sk = skb_to_full_sk(skb); 3045 3046 if (!sk || !sk_fullsock(sk)) 3047 return 0; 3048 3049 return sock_cgroup_classid(&sk->sk_cgrp_data); 3050 } 3051 3052 static const struct bpf_func_proto bpf_skb_cgroup_classid_proto = { 3053 .func = bpf_skb_cgroup_classid, 3054 .gpl_only = false, 3055 .ret_type = RET_INTEGER, 3056 .arg1_type = ARG_PTR_TO_CTX, 3057 }; 3058 #endif 3059 3060 BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb) 3061 { 3062 return task_get_classid(skb); 3063 } 3064 3065 static const struct bpf_func_proto bpf_get_cgroup_classid_proto = { 3066 .func = bpf_get_cgroup_classid, 3067 .gpl_only = false, 3068 .ret_type = RET_INTEGER, 3069 .arg1_type = ARG_PTR_TO_CTX, 3070 }; 3071 3072 BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb) 3073 { 3074 return dst_tclassid(skb); 3075 } 3076 3077 static const struct bpf_func_proto bpf_get_route_realm_proto = { 3078 .func = bpf_get_route_realm, 3079 .gpl_only = false, 3080 .ret_type = RET_INTEGER, 3081 .arg1_type = ARG_PTR_TO_CTX, 3082 }; 3083 3084 BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb) 3085 { 3086 /* If skb_clear_hash() was called due to mangling, we can 3087 * trigger SW recalculation here. Later access to hash 3088 * can then use the inline skb->hash via context directly 3089 * instead of calling this helper again. 3090 */ 3091 return skb_get_hash(skb); 3092 } 3093 3094 static const struct bpf_func_proto bpf_get_hash_recalc_proto = { 3095 .func = bpf_get_hash_recalc, 3096 .gpl_only = false, 3097 .ret_type = RET_INTEGER, 3098 .arg1_type = ARG_PTR_TO_CTX, 3099 }; 3100 3101 BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb) 3102 { 3103 /* After all direct packet write, this can be used once for 3104 * triggering a lazy recalc on next skb_get_hash() invocation. 3105 */ 3106 skb_clear_hash(skb); 3107 return 0; 3108 } 3109 3110 static const struct bpf_func_proto bpf_set_hash_invalid_proto = { 3111 .func = bpf_set_hash_invalid, 3112 .gpl_only = false, 3113 .ret_type = RET_INTEGER, 3114 .arg1_type = ARG_PTR_TO_CTX, 3115 }; 3116 3117 BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash) 3118 { 3119 /* Set user specified hash as L4(+), so that it gets returned 3120 * on skb_get_hash() call unless BPF prog later on triggers a 3121 * skb_clear_hash(). 3122 */ 3123 __skb_set_sw_hash(skb, hash, true); 3124 return 0; 3125 } 3126 3127 static const struct bpf_func_proto bpf_set_hash_proto = { 3128 .func = bpf_set_hash, 3129 .gpl_only = false, 3130 .ret_type = RET_INTEGER, 3131 .arg1_type = ARG_PTR_TO_CTX, 3132 .arg2_type = ARG_ANYTHING, 3133 }; 3134 3135 BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto, 3136 u16, vlan_tci) 3137 { 3138 int ret; 3139 3140 if (unlikely(vlan_proto != htons(ETH_P_8021Q) && 3141 vlan_proto != htons(ETH_P_8021AD))) 3142 vlan_proto = htons(ETH_P_8021Q); 3143 3144 bpf_push_mac_rcsum(skb); 3145 ret = skb_vlan_push(skb, vlan_proto, vlan_tci); 3146 bpf_pull_mac_rcsum(skb); 3147 3148 bpf_compute_data_pointers(skb); 3149 return ret; 3150 } 3151 3152 static const struct bpf_func_proto bpf_skb_vlan_push_proto = { 3153 .func = bpf_skb_vlan_push, 3154 .gpl_only = false, 3155 .ret_type = RET_INTEGER, 3156 .arg1_type = ARG_PTR_TO_CTX, 3157 .arg2_type = ARG_ANYTHING, 3158 .arg3_type = ARG_ANYTHING, 3159 }; 3160 3161 BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb) 3162 { 3163 int ret; 3164 3165 bpf_push_mac_rcsum(skb); 3166 ret = skb_vlan_pop(skb); 3167 bpf_pull_mac_rcsum(skb); 3168 3169 bpf_compute_data_pointers(skb); 3170 return ret; 3171 } 3172 3173 static const struct bpf_func_proto bpf_skb_vlan_pop_proto = { 3174 .func = bpf_skb_vlan_pop, 3175 .gpl_only = false, 3176 .ret_type = RET_INTEGER, 3177 .arg1_type = ARG_PTR_TO_CTX, 3178 }; 3179 3180 static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len) 3181 { 3182 /* Caller already did skb_cow() with len as headroom, 3183 * so no need to do it here. 3184 */ 3185 skb_push(skb, len); 3186 memmove(skb->data, skb->data + len, off); 3187 memset(skb->data + off, 0, len); 3188 3189 /* No skb_postpush_rcsum(skb, skb->data + off, len) 3190 * needed here as it does not change the skb->csum 3191 * result for checksum complete when summing over 3192 * zeroed blocks. 3193 */ 3194 return 0; 3195 } 3196 3197 static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len) 3198 { 3199 void *old_data; 3200 3201 /* skb_ensure_writable() is not needed here, as we're 3202 * already working on an uncloned skb. 3203 */ 3204 if (unlikely(!pskb_may_pull(skb, off + len))) 3205 return -ENOMEM; 3206 3207 old_data = skb->data; 3208 __skb_pull(skb, len); 3209 skb_postpull_rcsum(skb, old_data + off, len); 3210 memmove(skb->data, old_data, off); 3211 3212 return 0; 3213 } 3214 3215 static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len) 3216 { 3217 bool trans_same = skb->transport_header == skb->network_header; 3218 int ret; 3219 3220 /* There's no need for __skb_push()/__skb_pull() pair to 3221 * get to the start of the mac header as we're guaranteed 3222 * to always start from here under eBPF. 3223 */ 3224 ret = bpf_skb_generic_push(skb, off, len); 3225 if (likely(!ret)) { 3226 skb->mac_header -= len; 3227 skb->network_header -= len; 3228 if (trans_same) 3229 skb->transport_header = skb->network_header; 3230 } 3231 3232 return ret; 3233 } 3234 3235 static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len) 3236 { 3237 bool trans_same = skb->transport_header == skb->network_header; 3238 int ret; 3239 3240 /* Same here, __skb_push()/__skb_pull() pair not needed. */ 3241 ret = bpf_skb_generic_pop(skb, off, len); 3242 if (likely(!ret)) { 3243 skb->mac_header += len; 3244 skb->network_header += len; 3245 if (trans_same) 3246 skb->transport_header = skb->network_header; 3247 } 3248 3249 return ret; 3250 } 3251 3252 static int bpf_skb_proto_4_to_6(struct sk_buff *skb) 3253 { 3254 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); 3255 u32 off = skb_mac_header_len(skb); 3256 int ret; 3257 3258 ret = skb_cow(skb, len_diff); 3259 if (unlikely(ret < 0)) 3260 return ret; 3261 3262 ret = bpf_skb_net_hdr_push(skb, off, len_diff); 3263 if (unlikely(ret < 0)) 3264 return ret; 3265 3266 if (skb_is_gso(skb)) { 3267 struct skb_shared_info *shinfo = skb_shinfo(skb); 3268 3269 /* SKB_GSO_TCPV4 needs to be changed into SKB_GSO_TCPV6. */ 3270 if (shinfo->gso_type & SKB_GSO_TCPV4) { 3271 shinfo->gso_type &= ~SKB_GSO_TCPV4; 3272 shinfo->gso_type |= SKB_GSO_TCPV6; 3273 } 3274 } 3275 3276 skb->protocol = htons(ETH_P_IPV6); 3277 skb_clear_hash(skb); 3278 3279 return 0; 3280 } 3281 3282 static int bpf_skb_proto_6_to_4(struct sk_buff *skb) 3283 { 3284 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); 3285 u32 off = skb_mac_header_len(skb); 3286 int ret; 3287 3288 ret = skb_unclone(skb, GFP_ATOMIC); 3289 if (unlikely(ret < 0)) 3290 return ret; 3291 3292 ret = bpf_skb_net_hdr_pop(skb, off, len_diff); 3293 if (unlikely(ret < 0)) 3294 return ret; 3295 3296 if (skb_is_gso(skb)) { 3297 struct skb_shared_info *shinfo = skb_shinfo(skb); 3298 3299 /* SKB_GSO_TCPV6 needs to be changed into SKB_GSO_TCPV4. */ 3300 if (shinfo->gso_type & SKB_GSO_TCPV6) { 3301 shinfo->gso_type &= ~SKB_GSO_TCPV6; 3302 shinfo->gso_type |= SKB_GSO_TCPV4; 3303 } 3304 } 3305 3306 skb->protocol = htons(ETH_P_IP); 3307 skb_clear_hash(skb); 3308 3309 return 0; 3310 } 3311 3312 static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto) 3313 { 3314 __be16 from_proto = skb->protocol; 3315 3316 if (from_proto == htons(ETH_P_IP) && 3317 to_proto == htons(ETH_P_IPV6)) 3318 return bpf_skb_proto_4_to_6(skb); 3319 3320 if (from_proto == htons(ETH_P_IPV6) && 3321 to_proto == htons(ETH_P_IP)) 3322 return bpf_skb_proto_6_to_4(skb); 3323 3324 return -ENOTSUPP; 3325 } 3326 3327 BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto, 3328 u64, flags) 3329 { 3330 int ret; 3331 3332 if (unlikely(flags)) 3333 return -EINVAL; 3334 3335 /* General idea is that this helper does the basic groundwork 3336 * needed for changing the protocol, and eBPF program fills the 3337 * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace() 3338 * and other helpers, rather than passing a raw buffer here. 3339 * 3340 * The rationale is to keep this minimal and without a need to 3341 * deal with raw packet data. F.e. even if we would pass buffers 3342 * here, the program still needs to call the bpf_lX_csum_replace() 3343 * helpers anyway. Plus, this way we keep also separation of 3344 * concerns, since f.e. bpf_skb_store_bytes() should only take 3345 * care of stores. 3346 * 3347 * Currently, additional options and extension header space are 3348 * not supported, but flags register is reserved so we can adapt 3349 * that. For offloads, we mark packet as dodgy, so that headers 3350 * need to be verified first. 3351 */ 3352 ret = bpf_skb_proto_xlat(skb, proto); 3353 bpf_compute_data_pointers(skb); 3354 return ret; 3355 } 3356 3357 static const struct bpf_func_proto bpf_skb_change_proto_proto = { 3358 .func = bpf_skb_change_proto, 3359 .gpl_only = false, 3360 .ret_type = RET_INTEGER, 3361 .arg1_type = ARG_PTR_TO_CTX, 3362 .arg2_type = ARG_ANYTHING, 3363 .arg3_type = ARG_ANYTHING, 3364 }; 3365 3366 BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type) 3367 { 3368 /* We only allow a restricted subset to be changed for now. */ 3369 if (unlikely(!skb_pkt_type_ok(skb->pkt_type) || 3370 !skb_pkt_type_ok(pkt_type))) 3371 return -EINVAL; 3372 3373 skb->pkt_type = pkt_type; 3374 return 0; 3375 } 3376 3377 static const struct bpf_func_proto bpf_skb_change_type_proto = { 3378 .func = bpf_skb_change_type, 3379 .gpl_only = false, 3380 .ret_type = RET_INTEGER, 3381 .arg1_type = ARG_PTR_TO_CTX, 3382 .arg2_type = ARG_ANYTHING, 3383 }; 3384 3385 static u32 bpf_skb_net_base_len(const struct sk_buff *skb) 3386 { 3387 switch (skb->protocol) { 3388 case htons(ETH_P_IP): 3389 return sizeof(struct iphdr); 3390 case htons(ETH_P_IPV6): 3391 return sizeof(struct ipv6hdr); 3392 default: 3393 return ~0U; 3394 } 3395 } 3396 3397 #define BPF_F_ADJ_ROOM_ENCAP_L3_MASK (BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 | \ 3398 BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3399 3400 #define BPF_F_ADJ_ROOM_DECAP_L3_MASK (BPF_F_ADJ_ROOM_DECAP_L3_IPV4 | \ 3401 BPF_F_ADJ_ROOM_DECAP_L3_IPV6) 3402 3403 #define BPF_F_ADJ_ROOM_MASK (BPF_F_ADJ_ROOM_FIXED_GSO | \ 3404 BPF_F_ADJ_ROOM_ENCAP_L3_MASK | \ 3405 BPF_F_ADJ_ROOM_ENCAP_L4_GRE | \ 3406 BPF_F_ADJ_ROOM_ENCAP_L4_UDP | \ 3407 BPF_F_ADJ_ROOM_ENCAP_L2_ETH | \ 3408 BPF_F_ADJ_ROOM_ENCAP_L2( \ 3409 BPF_ADJ_ROOM_ENCAP_L2_MASK) | \ 3410 BPF_F_ADJ_ROOM_DECAP_L3_MASK) 3411 3412 static int bpf_skb_net_grow(struct sk_buff *skb, u32 off, u32 len_diff, 3413 u64 flags) 3414 { 3415 u8 inner_mac_len = flags >> BPF_ADJ_ROOM_ENCAP_L2_SHIFT; 3416 bool encap = flags & BPF_F_ADJ_ROOM_ENCAP_L3_MASK; 3417 u16 mac_len = 0, inner_net = 0, inner_trans = 0; 3418 unsigned int gso_type = SKB_GSO_DODGY; 3419 int ret; 3420 3421 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { 3422 /* udp gso_size delineates datagrams, only allow if fixed */ 3423 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || 3424 !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3425 return -ENOTSUPP; 3426 } 3427 3428 ret = skb_cow_head(skb, len_diff); 3429 if (unlikely(ret < 0)) 3430 return ret; 3431 3432 if (encap) { 3433 if (skb->protocol != htons(ETH_P_IP) && 3434 skb->protocol != htons(ETH_P_IPV6)) 3435 return -ENOTSUPP; 3436 3437 if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 && 3438 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3439 return -EINVAL; 3440 3441 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE && 3442 flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) 3443 return -EINVAL; 3444 3445 if (flags & BPF_F_ADJ_ROOM_ENCAP_L2_ETH && 3446 inner_mac_len < ETH_HLEN) 3447 return -EINVAL; 3448 3449 if (skb->encapsulation) 3450 return -EALREADY; 3451 3452 mac_len = skb->network_header - skb->mac_header; 3453 inner_net = skb->network_header; 3454 if (inner_mac_len > len_diff) 3455 return -EINVAL; 3456 inner_trans = skb->transport_header; 3457 } 3458 3459 ret = bpf_skb_net_hdr_push(skb, off, len_diff); 3460 if (unlikely(ret < 0)) 3461 return ret; 3462 3463 if (encap) { 3464 skb->inner_mac_header = inner_net - inner_mac_len; 3465 skb->inner_network_header = inner_net; 3466 skb->inner_transport_header = inner_trans; 3467 3468 if (flags & BPF_F_ADJ_ROOM_ENCAP_L2_ETH) 3469 skb_set_inner_protocol(skb, htons(ETH_P_TEB)); 3470 else 3471 skb_set_inner_protocol(skb, skb->protocol); 3472 3473 skb->encapsulation = 1; 3474 skb_set_network_header(skb, mac_len); 3475 3476 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) 3477 gso_type |= SKB_GSO_UDP_TUNNEL; 3478 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE) 3479 gso_type |= SKB_GSO_GRE; 3480 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3481 gso_type |= SKB_GSO_IPXIP6; 3482 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) 3483 gso_type |= SKB_GSO_IPXIP4; 3484 3485 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE || 3486 flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) { 3487 int nh_len = flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6 ? 3488 sizeof(struct ipv6hdr) : 3489 sizeof(struct iphdr); 3490 3491 skb_set_transport_header(skb, mac_len + nh_len); 3492 } 3493 3494 /* Match skb->protocol to new outer l3 protocol */ 3495 if (skb->protocol == htons(ETH_P_IP) && 3496 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3497 skb->protocol = htons(ETH_P_IPV6); 3498 else if (skb->protocol == htons(ETH_P_IPV6) && 3499 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) 3500 skb->protocol = htons(ETH_P_IP); 3501 } 3502 3503 if (skb_is_gso(skb)) { 3504 struct skb_shared_info *shinfo = skb_shinfo(skb); 3505 3506 /* Due to header grow, MSS needs to be downgraded. */ 3507 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3508 skb_decrease_gso_size(shinfo, len_diff); 3509 3510 /* Header must be checked, and gso_segs recomputed. */ 3511 shinfo->gso_type |= gso_type; 3512 shinfo->gso_segs = 0; 3513 } 3514 3515 return 0; 3516 } 3517 3518 static int bpf_skb_net_shrink(struct sk_buff *skb, u32 off, u32 len_diff, 3519 u64 flags) 3520 { 3521 int ret; 3522 3523 if (unlikely(flags & ~(BPF_F_ADJ_ROOM_FIXED_GSO | 3524 BPF_F_ADJ_ROOM_DECAP_L3_MASK | 3525 BPF_F_ADJ_ROOM_NO_CSUM_RESET))) 3526 return -EINVAL; 3527 3528 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { 3529 /* udp gso_size delineates datagrams, only allow if fixed */ 3530 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || 3531 !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3532 return -ENOTSUPP; 3533 } 3534 3535 ret = skb_unclone(skb, GFP_ATOMIC); 3536 if (unlikely(ret < 0)) 3537 return ret; 3538 3539 ret = bpf_skb_net_hdr_pop(skb, off, len_diff); 3540 if (unlikely(ret < 0)) 3541 return ret; 3542 3543 /* Match skb->protocol to new outer l3 protocol */ 3544 if (skb->protocol == htons(ETH_P_IP) && 3545 flags & BPF_F_ADJ_ROOM_DECAP_L3_IPV6) 3546 skb->protocol = htons(ETH_P_IPV6); 3547 else if (skb->protocol == htons(ETH_P_IPV6) && 3548 flags & BPF_F_ADJ_ROOM_DECAP_L3_IPV4) 3549 skb->protocol = htons(ETH_P_IP); 3550 3551 if (skb_is_gso(skb)) { 3552 struct skb_shared_info *shinfo = skb_shinfo(skb); 3553 3554 /* Due to header shrink, MSS can be upgraded. */ 3555 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3556 skb_increase_gso_size(shinfo, len_diff); 3557 3558 /* Header must be checked, and gso_segs recomputed. */ 3559 shinfo->gso_type |= SKB_GSO_DODGY; 3560 shinfo->gso_segs = 0; 3561 } 3562 3563 return 0; 3564 } 3565 3566 #define BPF_SKB_MAX_LEN SKB_MAX_ALLOC 3567 3568 BPF_CALL_4(sk_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, 3569 u32, mode, u64, flags) 3570 { 3571 u32 len_diff_abs = abs(len_diff); 3572 bool shrink = len_diff < 0; 3573 int ret = 0; 3574 3575 if (unlikely(flags || mode)) 3576 return -EINVAL; 3577 if (unlikely(len_diff_abs > 0xfffU)) 3578 return -EFAULT; 3579 3580 if (!shrink) { 3581 ret = skb_cow(skb, len_diff); 3582 if (unlikely(ret < 0)) 3583 return ret; 3584 __skb_push(skb, len_diff_abs); 3585 memset(skb->data, 0, len_diff_abs); 3586 } else { 3587 if (unlikely(!pskb_may_pull(skb, len_diff_abs))) 3588 return -ENOMEM; 3589 __skb_pull(skb, len_diff_abs); 3590 } 3591 if (tls_sw_has_ctx_rx(skb->sk)) { 3592 struct strp_msg *rxm = strp_msg(skb); 3593 3594 rxm->full_len += len_diff; 3595 } 3596 return ret; 3597 } 3598 3599 static const struct bpf_func_proto sk_skb_adjust_room_proto = { 3600 .func = sk_skb_adjust_room, 3601 .gpl_only = false, 3602 .ret_type = RET_INTEGER, 3603 .arg1_type = ARG_PTR_TO_CTX, 3604 .arg2_type = ARG_ANYTHING, 3605 .arg3_type = ARG_ANYTHING, 3606 .arg4_type = ARG_ANYTHING, 3607 }; 3608 3609 BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, 3610 u32, mode, u64, flags) 3611 { 3612 u32 len_cur, len_diff_abs = abs(len_diff); 3613 u32 len_min = bpf_skb_net_base_len(skb); 3614 u32 len_max = BPF_SKB_MAX_LEN; 3615 __be16 proto = skb->protocol; 3616 bool shrink = len_diff < 0; 3617 u32 off; 3618 int ret; 3619 3620 if (unlikely(flags & ~(BPF_F_ADJ_ROOM_MASK | 3621 BPF_F_ADJ_ROOM_NO_CSUM_RESET))) 3622 return -EINVAL; 3623 if (unlikely(len_diff_abs > 0xfffU)) 3624 return -EFAULT; 3625 if (unlikely(proto != htons(ETH_P_IP) && 3626 proto != htons(ETH_P_IPV6))) 3627 return -ENOTSUPP; 3628 3629 off = skb_mac_header_len(skb); 3630 switch (mode) { 3631 case BPF_ADJ_ROOM_NET: 3632 off += bpf_skb_net_base_len(skb); 3633 break; 3634 case BPF_ADJ_ROOM_MAC: 3635 break; 3636 default: 3637 return -ENOTSUPP; 3638 } 3639 3640 if (flags & BPF_F_ADJ_ROOM_DECAP_L3_MASK) { 3641 if (!shrink) 3642 return -EINVAL; 3643 3644 switch (flags & BPF_F_ADJ_ROOM_DECAP_L3_MASK) { 3645 case BPF_F_ADJ_ROOM_DECAP_L3_IPV4: 3646 len_min = sizeof(struct iphdr); 3647 break; 3648 case BPF_F_ADJ_ROOM_DECAP_L3_IPV6: 3649 len_min = sizeof(struct ipv6hdr); 3650 break; 3651 default: 3652 return -EINVAL; 3653 } 3654 } 3655 3656 len_cur = skb->len - skb_network_offset(skb); 3657 if ((shrink && (len_diff_abs >= len_cur || 3658 len_cur - len_diff_abs < len_min)) || 3659 (!shrink && (skb->len + len_diff_abs > len_max && 3660 !skb_is_gso(skb)))) 3661 return -ENOTSUPP; 3662 3663 ret = shrink ? bpf_skb_net_shrink(skb, off, len_diff_abs, flags) : 3664 bpf_skb_net_grow(skb, off, len_diff_abs, flags); 3665 if (!ret && !(flags & BPF_F_ADJ_ROOM_NO_CSUM_RESET)) 3666 __skb_reset_checksum_unnecessary(skb); 3667 3668 bpf_compute_data_pointers(skb); 3669 return ret; 3670 } 3671 3672 static const struct bpf_func_proto bpf_skb_adjust_room_proto = { 3673 .func = bpf_skb_adjust_room, 3674 .gpl_only = false, 3675 .ret_type = RET_INTEGER, 3676 .arg1_type = ARG_PTR_TO_CTX, 3677 .arg2_type = ARG_ANYTHING, 3678 .arg3_type = ARG_ANYTHING, 3679 .arg4_type = ARG_ANYTHING, 3680 }; 3681 3682 static u32 __bpf_skb_min_len(const struct sk_buff *skb) 3683 { 3684 u32 min_len = skb_network_offset(skb); 3685 3686 if (skb_transport_header_was_set(skb)) 3687 min_len = skb_transport_offset(skb); 3688 if (skb->ip_summed == CHECKSUM_PARTIAL) 3689 min_len = skb_checksum_start_offset(skb) + 3690 skb->csum_offset + sizeof(__sum16); 3691 return min_len; 3692 } 3693 3694 static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len) 3695 { 3696 unsigned int old_len = skb->len; 3697 int ret; 3698 3699 ret = __skb_grow_rcsum(skb, new_len); 3700 if (!ret) 3701 memset(skb->data + old_len, 0, new_len - old_len); 3702 return ret; 3703 } 3704 3705 static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len) 3706 { 3707 return __skb_trim_rcsum(skb, new_len); 3708 } 3709 3710 static inline int __bpf_skb_change_tail(struct sk_buff *skb, u32 new_len, 3711 u64 flags) 3712 { 3713 u32 max_len = BPF_SKB_MAX_LEN; 3714 u32 min_len = __bpf_skb_min_len(skb); 3715 int ret; 3716 3717 if (unlikely(flags || new_len > max_len || new_len < min_len)) 3718 return -EINVAL; 3719 if (skb->encapsulation) 3720 return -ENOTSUPP; 3721 3722 /* The basic idea of this helper is that it's performing the 3723 * needed work to either grow or trim an skb, and eBPF program 3724 * rewrites the rest via helpers like bpf_skb_store_bytes(), 3725 * bpf_lX_csum_replace() and others rather than passing a raw 3726 * buffer here. This one is a slow path helper and intended 3727 * for replies with control messages. 3728 * 3729 * Like in bpf_skb_change_proto(), we want to keep this rather 3730 * minimal and without protocol specifics so that we are able 3731 * to separate concerns as in bpf_skb_store_bytes() should only 3732 * be the one responsible for writing buffers. 3733 * 3734 * It's really expected to be a slow path operation here for 3735 * control message replies, so we're implicitly linearizing, 3736 * uncloning and drop offloads from the skb by this. 3737 */ 3738 ret = __bpf_try_make_writable(skb, skb->len); 3739 if (!ret) { 3740 if (new_len > skb->len) 3741 ret = bpf_skb_grow_rcsum(skb, new_len); 3742 else if (new_len < skb->len) 3743 ret = bpf_skb_trim_rcsum(skb, new_len); 3744 if (!ret && skb_is_gso(skb)) 3745 skb_gso_reset(skb); 3746 } 3747 return ret; 3748 } 3749 3750 BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len, 3751 u64, flags) 3752 { 3753 int ret = __bpf_skb_change_tail(skb, new_len, flags); 3754 3755 bpf_compute_data_pointers(skb); 3756 return ret; 3757 } 3758 3759 static const struct bpf_func_proto bpf_skb_change_tail_proto = { 3760 .func = bpf_skb_change_tail, 3761 .gpl_only = false, 3762 .ret_type = RET_INTEGER, 3763 .arg1_type = ARG_PTR_TO_CTX, 3764 .arg2_type = ARG_ANYTHING, 3765 .arg3_type = ARG_ANYTHING, 3766 }; 3767 3768 BPF_CALL_3(sk_skb_change_tail, struct sk_buff *, skb, u32, new_len, 3769 u64, flags) 3770 { 3771 return __bpf_skb_change_tail(skb, new_len, flags); 3772 } 3773 3774 static const struct bpf_func_proto sk_skb_change_tail_proto = { 3775 .func = sk_skb_change_tail, 3776 .gpl_only = false, 3777 .ret_type = RET_INTEGER, 3778 .arg1_type = ARG_PTR_TO_CTX, 3779 .arg2_type = ARG_ANYTHING, 3780 .arg3_type = ARG_ANYTHING, 3781 }; 3782 3783 static inline int __bpf_skb_change_head(struct sk_buff *skb, u32 head_room, 3784 u64 flags) 3785 { 3786 u32 max_len = BPF_SKB_MAX_LEN; 3787 u32 new_len = skb->len + head_room; 3788 int ret; 3789 3790 if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) || 3791 new_len < skb->len)) 3792 return -EINVAL; 3793 3794 ret = skb_cow(skb, head_room); 3795 if (likely(!ret)) { 3796 /* Idea for this helper is that we currently only 3797 * allow to expand on mac header. This means that 3798 * skb->protocol network header, etc, stay as is. 3799 * Compared to bpf_skb_change_tail(), we're more 3800 * flexible due to not needing to linearize or 3801 * reset GSO. Intention for this helper is to be 3802 * used by an L3 skb that needs to push mac header 3803 * for redirection into L2 device. 3804 */ 3805 __skb_push(skb, head_room); 3806 memset(skb->data, 0, head_room); 3807 skb_reset_mac_header(skb); 3808 skb_reset_mac_len(skb); 3809 } 3810 3811 return ret; 3812 } 3813 3814 BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room, 3815 u64, flags) 3816 { 3817 int ret = __bpf_skb_change_head(skb, head_room, flags); 3818 3819 bpf_compute_data_pointers(skb); 3820 return ret; 3821 } 3822 3823 static const struct bpf_func_proto bpf_skb_change_head_proto = { 3824 .func = bpf_skb_change_head, 3825 .gpl_only = false, 3826 .ret_type = RET_INTEGER, 3827 .arg1_type = ARG_PTR_TO_CTX, 3828 .arg2_type = ARG_ANYTHING, 3829 .arg3_type = ARG_ANYTHING, 3830 }; 3831 3832 BPF_CALL_3(sk_skb_change_head, struct sk_buff *, skb, u32, head_room, 3833 u64, flags) 3834 { 3835 return __bpf_skb_change_head(skb, head_room, flags); 3836 } 3837 3838 static const struct bpf_func_proto sk_skb_change_head_proto = { 3839 .func = sk_skb_change_head, 3840 .gpl_only = false, 3841 .ret_type = RET_INTEGER, 3842 .arg1_type = ARG_PTR_TO_CTX, 3843 .arg2_type = ARG_ANYTHING, 3844 .arg3_type = ARG_ANYTHING, 3845 }; 3846 3847 BPF_CALL_1(bpf_xdp_get_buff_len, struct xdp_buff*, xdp) 3848 { 3849 return xdp_get_buff_len(xdp); 3850 } 3851 3852 static const struct bpf_func_proto bpf_xdp_get_buff_len_proto = { 3853 .func = bpf_xdp_get_buff_len, 3854 .gpl_only = false, 3855 .ret_type = RET_INTEGER, 3856 .arg1_type = ARG_PTR_TO_CTX, 3857 }; 3858 3859 BTF_ID_LIST_SINGLE(bpf_xdp_get_buff_len_bpf_ids, struct, xdp_buff) 3860 3861 const struct bpf_func_proto bpf_xdp_get_buff_len_trace_proto = { 3862 .func = bpf_xdp_get_buff_len, 3863 .gpl_only = false, 3864 .arg1_type = ARG_PTR_TO_BTF_ID, 3865 .arg1_btf_id = &bpf_xdp_get_buff_len_bpf_ids[0], 3866 }; 3867 3868 static unsigned long xdp_get_metalen(const struct xdp_buff *xdp) 3869 { 3870 return xdp_data_meta_unsupported(xdp) ? 0 : 3871 xdp->data - xdp->data_meta; 3872 } 3873 3874 BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset) 3875 { 3876 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); 3877 unsigned long metalen = xdp_get_metalen(xdp); 3878 void *data_start = xdp_frame_end + metalen; 3879 void *data = xdp->data + offset; 3880 3881 if (unlikely(data < data_start || 3882 data > xdp->data_end - ETH_HLEN)) 3883 return -EINVAL; 3884 3885 if (metalen) 3886 memmove(xdp->data_meta + offset, 3887 xdp->data_meta, metalen); 3888 xdp->data_meta += offset; 3889 xdp->data = data; 3890 3891 return 0; 3892 } 3893 3894 static const struct bpf_func_proto bpf_xdp_adjust_head_proto = { 3895 .func = bpf_xdp_adjust_head, 3896 .gpl_only = false, 3897 .ret_type = RET_INTEGER, 3898 .arg1_type = ARG_PTR_TO_CTX, 3899 .arg2_type = ARG_ANYTHING, 3900 }; 3901 3902 void bpf_xdp_copy_buf(struct xdp_buff *xdp, unsigned long off, 3903 void *buf, unsigned long len, bool flush) 3904 { 3905 unsigned long ptr_len, ptr_off = 0; 3906 skb_frag_t *next_frag, *end_frag; 3907 struct skb_shared_info *sinfo; 3908 void *src, *dst; 3909 u8 *ptr_buf; 3910 3911 if (likely(xdp->data_end - xdp->data >= off + len)) { 3912 src = flush ? buf : xdp->data + off; 3913 dst = flush ? xdp->data + off : buf; 3914 memcpy(dst, src, len); 3915 return; 3916 } 3917 3918 sinfo = xdp_get_shared_info_from_buff(xdp); 3919 end_frag = &sinfo->frags[sinfo->nr_frags]; 3920 next_frag = &sinfo->frags[0]; 3921 3922 ptr_len = xdp->data_end - xdp->data; 3923 ptr_buf = xdp->data; 3924 3925 while (true) { 3926 if (off < ptr_off + ptr_len) { 3927 unsigned long copy_off = off - ptr_off; 3928 unsigned long copy_len = min(len, ptr_len - copy_off); 3929 3930 src = flush ? buf : ptr_buf + copy_off; 3931 dst = flush ? ptr_buf + copy_off : buf; 3932 memcpy(dst, src, copy_len); 3933 3934 off += copy_len; 3935 len -= copy_len; 3936 buf += copy_len; 3937 } 3938 3939 if (!len || next_frag == end_frag) 3940 break; 3941 3942 ptr_off += ptr_len; 3943 ptr_buf = skb_frag_address(next_frag); 3944 ptr_len = skb_frag_size(next_frag); 3945 next_frag++; 3946 } 3947 } 3948 3949 void *bpf_xdp_pointer(struct xdp_buff *xdp, u32 offset, u32 len) 3950 { 3951 u32 size = xdp->data_end - xdp->data; 3952 struct skb_shared_info *sinfo; 3953 void *addr = xdp->data; 3954 int i; 3955 3956 if (unlikely(offset > 0xffff || len > 0xffff)) 3957 return ERR_PTR(-EFAULT); 3958 3959 if (unlikely(offset + len > xdp_get_buff_len(xdp))) 3960 return ERR_PTR(-EINVAL); 3961 3962 if (likely(offset < size)) /* linear area */ 3963 goto out; 3964 3965 sinfo = xdp_get_shared_info_from_buff(xdp); 3966 offset -= size; 3967 for (i = 0; i < sinfo->nr_frags; i++) { /* paged area */ 3968 u32 frag_size = skb_frag_size(&sinfo->frags[i]); 3969 3970 if (offset < frag_size) { 3971 addr = skb_frag_address(&sinfo->frags[i]); 3972 size = frag_size; 3973 break; 3974 } 3975 offset -= frag_size; 3976 } 3977 out: 3978 return offset + len <= size ? addr + offset : NULL; 3979 } 3980 3981 BPF_CALL_4(bpf_xdp_load_bytes, struct xdp_buff *, xdp, u32, offset, 3982 void *, buf, u32, len) 3983 { 3984 void *ptr; 3985 3986 ptr = bpf_xdp_pointer(xdp, offset, len); 3987 if (IS_ERR(ptr)) 3988 return PTR_ERR(ptr); 3989 3990 if (!ptr) 3991 bpf_xdp_copy_buf(xdp, offset, buf, len, false); 3992 else 3993 memcpy(buf, ptr, len); 3994 3995 return 0; 3996 } 3997 3998 static const struct bpf_func_proto bpf_xdp_load_bytes_proto = { 3999 .func = bpf_xdp_load_bytes, 4000 .gpl_only = false, 4001 .ret_type = RET_INTEGER, 4002 .arg1_type = ARG_PTR_TO_CTX, 4003 .arg2_type = ARG_ANYTHING, 4004 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 4005 .arg4_type = ARG_CONST_SIZE, 4006 }; 4007 4008 int __bpf_xdp_load_bytes(struct xdp_buff *xdp, u32 offset, void *buf, u32 len) 4009 { 4010 return ____bpf_xdp_load_bytes(xdp, offset, buf, len); 4011 } 4012 4013 BPF_CALL_4(bpf_xdp_store_bytes, struct xdp_buff *, xdp, u32, offset, 4014 void *, buf, u32, len) 4015 { 4016 void *ptr; 4017 4018 ptr = bpf_xdp_pointer(xdp, offset, len); 4019 if (IS_ERR(ptr)) 4020 return PTR_ERR(ptr); 4021 4022 if (!ptr) 4023 bpf_xdp_copy_buf(xdp, offset, buf, len, true); 4024 else 4025 memcpy(ptr, buf, len); 4026 4027 return 0; 4028 } 4029 4030 static const struct bpf_func_proto bpf_xdp_store_bytes_proto = { 4031 .func = bpf_xdp_store_bytes, 4032 .gpl_only = false, 4033 .ret_type = RET_INTEGER, 4034 .arg1_type = ARG_PTR_TO_CTX, 4035 .arg2_type = ARG_ANYTHING, 4036 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 4037 .arg4_type = ARG_CONST_SIZE, 4038 }; 4039 4040 int __bpf_xdp_store_bytes(struct xdp_buff *xdp, u32 offset, void *buf, u32 len) 4041 { 4042 return ____bpf_xdp_store_bytes(xdp, offset, buf, len); 4043 } 4044 4045 static int bpf_xdp_frags_increase_tail(struct xdp_buff *xdp, int offset) 4046 { 4047 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); 4048 skb_frag_t *frag = &sinfo->frags[sinfo->nr_frags - 1]; 4049 struct xdp_rxq_info *rxq = xdp->rxq; 4050 unsigned int tailroom; 4051 4052 if (!rxq->frag_size || rxq->frag_size > xdp->frame_sz) 4053 return -EOPNOTSUPP; 4054 4055 tailroom = rxq->frag_size - skb_frag_size(frag) - skb_frag_off(frag); 4056 if (unlikely(offset > tailroom)) 4057 return -EINVAL; 4058 4059 memset(skb_frag_address(frag) + skb_frag_size(frag), 0, offset); 4060 skb_frag_size_add(frag, offset); 4061 sinfo->xdp_frags_size += offset; 4062 4063 return 0; 4064 } 4065 4066 static int bpf_xdp_frags_shrink_tail(struct xdp_buff *xdp, int offset) 4067 { 4068 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); 4069 int i, n_frags_free = 0, len_free = 0; 4070 4071 if (unlikely(offset > (int)xdp_get_buff_len(xdp) - ETH_HLEN)) 4072 return -EINVAL; 4073 4074 for (i = sinfo->nr_frags - 1; i >= 0 && offset > 0; i--) { 4075 skb_frag_t *frag = &sinfo->frags[i]; 4076 int shrink = min_t(int, offset, skb_frag_size(frag)); 4077 4078 len_free += shrink; 4079 offset -= shrink; 4080 4081 if (skb_frag_size(frag) == shrink) { 4082 struct page *page = skb_frag_page(frag); 4083 4084 __xdp_return(page_address(page), &xdp->rxq->mem, 4085 false, NULL); 4086 n_frags_free++; 4087 } else { 4088 skb_frag_size_sub(frag, shrink); 4089 break; 4090 } 4091 } 4092 sinfo->nr_frags -= n_frags_free; 4093 sinfo->xdp_frags_size -= len_free; 4094 4095 if (unlikely(!sinfo->nr_frags)) { 4096 xdp_buff_clear_frags_flag(xdp); 4097 xdp->data_end -= offset; 4098 } 4099 4100 return 0; 4101 } 4102 4103 BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset) 4104 { 4105 void *data_hard_end = xdp_data_hard_end(xdp); /* use xdp->frame_sz */ 4106 void *data_end = xdp->data_end + offset; 4107 4108 if (unlikely(xdp_buff_has_frags(xdp))) { /* non-linear xdp buff */ 4109 if (offset < 0) 4110 return bpf_xdp_frags_shrink_tail(xdp, -offset); 4111 4112 return bpf_xdp_frags_increase_tail(xdp, offset); 4113 } 4114 4115 /* Notice that xdp_data_hard_end have reserved some tailroom */ 4116 if (unlikely(data_end > data_hard_end)) 4117 return -EINVAL; 4118 4119 if (unlikely(data_end < xdp->data + ETH_HLEN)) 4120 return -EINVAL; 4121 4122 /* Clear memory area on grow, can contain uninit kernel memory */ 4123 if (offset > 0) 4124 memset(xdp->data_end, 0, offset); 4125 4126 xdp->data_end = data_end; 4127 4128 return 0; 4129 } 4130 4131 static const struct bpf_func_proto bpf_xdp_adjust_tail_proto = { 4132 .func = bpf_xdp_adjust_tail, 4133 .gpl_only = false, 4134 .ret_type = RET_INTEGER, 4135 .arg1_type = ARG_PTR_TO_CTX, 4136 .arg2_type = ARG_ANYTHING, 4137 }; 4138 4139 BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset) 4140 { 4141 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); 4142 void *meta = xdp->data_meta + offset; 4143 unsigned long metalen = xdp->data - meta; 4144 4145 if (xdp_data_meta_unsupported(xdp)) 4146 return -ENOTSUPP; 4147 if (unlikely(meta < xdp_frame_end || 4148 meta > xdp->data)) 4149 return -EINVAL; 4150 if (unlikely(xdp_metalen_invalid(metalen))) 4151 return -EACCES; 4152 4153 xdp->data_meta = meta; 4154 4155 return 0; 4156 } 4157 4158 static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = { 4159 .func = bpf_xdp_adjust_meta, 4160 .gpl_only = false, 4161 .ret_type = RET_INTEGER, 4162 .arg1_type = ARG_PTR_TO_CTX, 4163 .arg2_type = ARG_ANYTHING, 4164 }; 4165 4166 /** 4167 * DOC: xdp redirect 4168 * 4169 * XDP_REDIRECT works by a three-step process, implemented in the functions 4170 * below: 4171 * 4172 * 1. The bpf_redirect() and bpf_redirect_map() helpers will lookup the target 4173 * of the redirect and store it (along with some other metadata) in a per-CPU 4174 * struct bpf_redirect_info. 4175 * 4176 * 2. When the program returns the XDP_REDIRECT return code, the driver will 4177 * call xdp_do_redirect() which will use the information in struct 4178 * bpf_redirect_info to actually enqueue the frame into a map type-specific 4179 * bulk queue structure. 4180 * 4181 * 3. Before exiting its NAPI poll loop, the driver will call 4182 * xdp_do_flush(), which will flush all the different bulk queues, 4183 * thus completing the redirect. Note that xdp_do_flush() must be 4184 * called before napi_complete_done() in the driver, as the 4185 * XDP_REDIRECT logic relies on being inside a single NAPI instance 4186 * through to the xdp_do_flush() call for RCU protection of all 4187 * in-kernel data structures. 4188 */ 4189 /* 4190 * Pointers to the map entries will be kept around for this whole sequence of 4191 * steps, protected by RCU. However, there is no top-level rcu_read_lock() in 4192 * the core code; instead, the RCU protection relies on everything happening 4193 * inside a single NAPI poll sequence, which means it's between a pair of calls 4194 * to local_bh_disable()/local_bh_enable(). 4195 * 4196 * The map entries are marked as __rcu and the map code makes sure to 4197 * dereference those pointers with rcu_dereference_check() in a way that works 4198 * for both sections that to hold an rcu_read_lock() and sections that are 4199 * called from NAPI without a separate rcu_read_lock(). The code below does not 4200 * use RCU annotations, but relies on those in the map code. 4201 */ 4202 void xdp_do_flush(void) 4203 { 4204 __dev_flush(); 4205 __cpu_map_flush(); 4206 __xsk_map_flush(); 4207 } 4208 EXPORT_SYMBOL_GPL(xdp_do_flush); 4209 4210 void bpf_clear_redirect_map(struct bpf_map *map) 4211 { 4212 struct bpf_redirect_info *ri; 4213 int cpu; 4214 4215 for_each_possible_cpu(cpu) { 4216 ri = per_cpu_ptr(&bpf_redirect_info, cpu); 4217 /* Avoid polluting remote cacheline due to writes if 4218 * not needed. Once we pass this test, we need the 4219 * cmpxchg() to make sure it hasn't been changed in 4220 * the meantime by remote CPU. 4221 */ 4222 if (unlikely(READ_ONCE(ri->map) == map)) 4223 cmpxchg(&ri->map, map, NULL); 4224 } 4225 } 4226 4227 DEFINE_STATIC_KEY_FALSE(bpf_master_redirect_enabled_key); 4228 EXPORT_SYMBOL_GPL(bpf_master_redirect_enabled_key); 4229 4230 u32 xdp_master_redirect(struct xdp_buff *xdp) 4231 { 4232 struct net_device *master, *slave; 4233 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4234 4235 master = netdev_master_upper_dev_get_rcu(xdp->rxq->dev); 4236 slave = master->netdev_ops->ndo_xdp_get_xmit_slave(master, xdp); 4237 if (slave && slave != xdp->rxq->dev) { 4238 /* The target device is different from the receiving device, so 4239 * redirect it to the new device. 4240 * Using XDP_REDIRECT gets the correct behaviour from XDP enabled 4241 * drivers to unmap the packet from their rx ring. 4242 */ 4243 ri->tgt_index = slave->ifindex; 4244 ri->map_id = INT_MAX; 4245 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4246 return XDP_REDIRECT; 4247 } 4248 return XDP_TX; 4249 } 4250 EXPORT_SYMBOL_GPL(xdp_master_redirect); 4251 4252 static inline int __xdp_do_redirect_xsk(struct bpf_redirect_info *ri, 4253 struct net_device *dev, 4254 struct xdp_buff *xdp, 4255 struct bpf_prog *xdp_prog) 4256 { 4257 enum bpf_map_type map_type = ri->map_type; 4258 void *fwd = ri->tgt_value; 4259 u32 map_id = ri->map_id; 4260 int err; 4261 4262 ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */ 4263 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4264 4265 err = __xsk_map_redirect(fwd, xdp); 4266 if (unlikely(err)) 4267 goto err; 4268 4269 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index); 4270 return 0; 4271 err: 4272 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index, err); 4273 return err; 4274 } 4275 4276 static __always_inline int __xdp_do_redirect_frame(struct bpf_redirect_info *ri, 4277 struct net_device *dev, 4278 struct xdp_frame *xdpf, 4279 struct bpf_prog *xdp_prog) 4280 { 4281 enum bpf_map_type map_type = ri->map_type; 4282 void *fwd = ri->tgt_value; 4283 u32 map_id = ri->map_id; 4284 struct bpf_map *map; 4285 int err; 4286 4287 ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */ 4288 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4289 4290 if (unlikely(!xdpf)) { 4291 err = -EOVERFLOW; 4292 goto err; 4293 } 4294 4295 switch (map_type) { 4296 case BPF_MAP_TYPE_DEVMAP: 4297 fallthrough; 4298 case BPF_MAP_TYPE_DEVMAP_HASH: 4299 map = READ_ONCE(ri->map); 4300 if (unlikely(map)) { 4301 WRITE_ONCE(ri->map, NULL); 4302 err = dev_map_enqueue_multi(xdpf, dev, map, 4303 ri->flags & BPF_F_EXCLUDE_INGRESS); 4304 } else { 4305 err = dev_map_enqueue(fwd, xdpf, dev); 4306 } 4307 break; 4308 case BPF_MAP_TYPE_CPUMAP: 4309 err = cpu_map_enqueue(fwd, xdpf, dev); 4310 break; 4311 case BPF_MAP_TYPE_UNSPEC: 4312 if (map_id == INT_MAX) { 4313 fwd = dev_get_by_index_rcu(dev_net(dev), ri->tgt_index); 4314 if (unlikely(!fwd)) { 4315 err = -EINVAL; 4316 break; 4317 } 4318 err = dev_xdp_enqueue(fwd, xdpf, dev); 4319 break; 4320 } 4321 fallthrough; 4322 default: 4323 err = -EBADRQC; 4324 } 4325 4326 if (unlikely(err)) 4327 goto err; 4328 4329 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index); 4330 return 0; 4331 err: 4332 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index, err); 4333 return err; 4334 } 4335 4336 int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp, 4337 struct bpf_prog *xdp_prog) 4338 { 4339 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4340 enum bpf_map_type map_type = ri->map_type; 4341 4342 if (map_type == BPF_MAP_TYPE_XSKMAP) 4343 return __xdp_do_redirect_xsk(ri, dev, xdp, xdp_prog); 4344 4345 return __xdp_do_redirect_frame(ri, dev, xdp_convert_buff_to_frame(xdp), 4346 xdp_prog); 4347 } 4348 EXPORT_SYMBOL_GPL(xdp_do_redirect); 4349 4350 int xdp_do_redirect_frame(struct net_device *dev, struct xdp_buff *xdp, 4351 struct xdp_frame *xdpf, struct bpf_prog *xdp_prog) 4352 { 4353 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4354 enum bpf_map_type map_type = ri->map_type; 4355 4356 if (map_type == BPF_MAP_TYPE_XSKMAP) 4357 return __xdp_do_redirect_xsk(ri, dev, xdp, xdp_prog); 4358 4359 return __xdp_do_redirect_frame(ri, dev, xdpf, xdp_prog); 4360 } 4361 EXPORT_SYMBOL_GPL(xdp_do_redirect_frame); 4362 4363 static int xdp_do_generic_redirect_map(struct net_device *dev, 4364 struct sk_buff *skb, 4365 struct xdp_buff *xdp, 4366 struct bpf_prog *xdp_prog, 4367 void *fwd, 4368 enum bpf_map_type map_type, u32 map_id) 4369 { 4370 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4371 struct bpf_map *map; 4372 int err; 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_redirect_multi(dev, skb, xdp_prog, map, 4382 ri->flags & BPF_F_EXCLUDE_INGRESS); 4383 } else { 4384 err = dev_map_generic_redirect(fwd, skb, xdp_prog); 4385 } 4386 if (unlikely(err)) 4387 goto err; 4388 break; 4389 case BPF_MAP_TYPE_XSKMAP: 4390 err = xsk_generic_rcv(fwd, xdp); 4391 if (err) 4392 goto err; 4393 consume_skb(skb); 4394 break; 4395 case BPF_MAP_TYPE_CPUMAP: 4396 err = cpu_map_generic_redirect(fwd, skb); 4397 if (unlikely(err)) 4398 goto err; 4399 break; 4400 default: 4401 err = -EBADRQC; 4402 goto err; 4403 } 4404 4405 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index); 4406 return 0; 4407 err: 4408 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index, err); 4409 return err; 4410 } 4411 4412 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb, 4413 struct xdp_buff *xdp, struct bpf_prog *xdp_prog) 4414 { 4415 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4416 enum bpf_map_type map_type = ri->map_type; 4417 void *fwd = ri->tgt_value; 4418 u32 map_id = ri->map_id; 4419 int err; 4420 4421 ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */ 4422 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4423 4424 if (map_type == BPF_MAP_TYPE_UNSPEC && map_id == INT_MAX) { 4425 fwd = dev_get_by_index_rcu(dev_net(dev), ri->tgt_index); 4426 if (unlikely(!fwd)) { 4427 err = -EINVAL; 4428 goto err; 4429 } 4430 4431 err = xdp_ok_fwd_dev(fwd, skb->len); 4432 if (unlikely(err)) 4433 goto err; 4434 4435 skb->dev = fwd; 4436 _trace_xdp_redirect(dev, xdp_prog, ri->tgt_index); 4437 generic_xdp_tx(skb, xdp_prog); 4438 return 0; 4439 } 4440 4441 return xdp_do_generic_redirect_map(dev, skb, xdp, xdp_prog, fwd, map_type, map_id); 4442 err: 4443 _trace_xdp_redirect_err(dev, xdp_prog, ri->tgt_index, err); 4444 return err; 4445 } 4446 4447 BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags) 4448 { 4449 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4450 4451 if (unlikely(flags)) 4452 return XDP_ABORTED; 4453 4454 /* NB! Map type UNSPEC and map_id == INT_MAX (never generated 4455 * by map_idr) is used for ifindex based XDP redirect. 4456 */ 4457 ri->tgt_index = ifindex; 4458 ri->map_id = INT_MAX; 4459 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4460 4461 return XDP_REDIRECT; 4462 } 4463 4464 static const struct bpf_func_proto bpf_xdp_redirect_proto = { 4465 .func = bpf_xdp_redirect, 4466 .gpl_only = false, 4467 .ret_type = RET_INTEGER, 4468 .arg1_type = ARG_ANYTHING, 4469 .arg2_type = ARG_ANYTHING, 4470 }; 4471 4472 BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u64, key, 4473 u64, flags) 4474 { 4475 return map->ops->map_redirect(map, key, flags); 4476 } 4477 4478 static const struct bpf_func_proto bpf_xdp_redirect_map_proto = { 4479 .func = bpf_xdp_redirect_map, 4480 .gpl_only = false, 4481 .ret_type = RET_INTEGER, 4482 .arg1_type = ARG_CONST_MAP_PTR, 4483 .arg2_type = ARG_ANYTHING, 4484 .arg3_type = ARG_ANYTHING, 4485 }; 4486 4487 static unsigned long bpf_skb_copy(void *dst_buff, const void *skb, 4488 unsigned long off, unsigned long len) 4489 { 4490 void *ptr = skb_header_pointer(skb, off, len, dst_buff); 4491 4492 if (unlikely(!ptr)) 4493 return len; 4494 if (ptr != dst_buff) 4495 memcpy(dst_buff, ptr, len); 4496 4497 return 0; 4498 } 4499 4500 BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map, 4501 u64, flags, void *, meta, u64, meta_size) 4502 { 4503 u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32; 4504 4505 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) 4506 return -EINVAL; 4507 if (unlikely(!skb || skb_size > skb->len)) 4508 return -EFAULT; 4509 4510 return bpf_event_output(map, flags, meta, meta_size, skb, skb_size, 4511 bpf_skb_copy); 4512 } 4513 4514 static const struct bpf_func_proto bpf_skb_event_output_proto = { 4515 .func = bpf_skb_event_output, 4516 .gpl_only = true, 4517 .ret_type = RET_INTEGER, 4518 .arg1_type = ARG_PTR_TO_CTX, 4519 .arg2_type = ARG_CONST_MAP_PTR, 4520 .arg3_type = ARG_ANYTHING, 4521 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4522 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4523 }; 4524 4525 BTF_ID_LIST_SINGLE(bpf_skb_output_btf_ids, struct, sk_buff) 4526 4527 const struct bpf_func_proto bpf_skb_output_proto = { 4528 .func = bpf_skb_event_output, 4529 .gpl_only = true, 4530 .ret_type = RET_INTEGER, 4531 .arg1_type = ARG_PTR_TO_BTF_ID, 4532 .arg1_btf_id = &bpf_skb_output_btf_ids[0], 4533 .arg2_type = ARG_CONST_MAP_PTR, 4534 .arg3_type = ARG_ANYTHING, 4535 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4536 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4537 }; 4538 4539 static unsigned short bpf_tunnel_key_af(u64 flags) 4540 { 4541 return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET; 4542 } 4543 4544 BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to, 4545 u32, size, u64, flags) 4546 { 4547 const struct ip_tunnel_info *info = skb_tunnel_info(skb); 4548 u8 compat[sizeof(struct bpf_tunnel_key)]; 4549 void *to_orig = to; 4550 int err; 4551 4552 if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6 | 4553 BPF_F_TUNINFO_FLAGS)))) { 4554 err = -EINVAL; 4555 goto err_clear; 4556 } 4557 if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) { 4558 err = -EPROTO; 4559 goto err_clear; 4560 } 4561 if (unlikely(size != sizeof(struct bpf_tunnel_key))) { 4562 err = -EINVAL; 4563 switch (size) { 4564 case offsetof(struct bpf_tunnel_key, local_ipv6[0]): 4565 case offsetof(struct bpf_tunnel_key, tunnel_label): 4566 case offsetof(struct bpf_tunnel_key, tunnel_ext): 4567 goto set_compat; 4568 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): 4569 /* Fixup deprecated structure layouts here, so we have 4570 * a common path later on. 4571 */ 4572 if (ip_tunnel_info_af(info) != AF_INET) 4573 goto err_clear; 4574 set_compat: 4575 to = (struct bpf_tunnel_key *)compat; 4576 break; 4577 default: 4578 goto err_clear; 4579 } 4580 } 4581 4582 to->tunnel_id = be64_to_cpu(info->key.tun_id); 4583 to->tunnel_tos = info->key.tos; 4584 to->tunnel_ttl = info->key.ttl; 4585 if (flags & BPF_F_TUNINFO_FLAGS) 4586 to->tunnel_flags = info->key.tun_flags; 4587 else 4588 to->tunnel_ext = 0; 4589 4590 if (flags & BPF_F_TUNINFO_IPV6) { 4591 memcpy(to->remote_ipv6, &info->key.u.ipv6.src, 4592 sizeof(to->remote_ipv6)); 4593 memcpy(to->local_ipv6, &info->key.u.ipv6.dst, 4594 sizeof(to->local_ipv6)); 4595 to->tunnel_label = be32_to_cpu(info->key.label); 4596 } else { 4597 to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src); 4598 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); 4599 to->local_ipv4 = be32_to_cpu(info->key.u.ipv4.dst); 4600 memset(&to->local_ipv6[1], 0, sizeof(__u32) * 3); 4601 to->tunnel_label = 0; 4602 } 4603 4604 if (unlikely(size != sizeof(struct bpf_tunnel_key))) 4605 memcpy(to_orig, to, size); 4606 4607 return 0; 4608 err_clear: 4609 memset(to_orig, 0, size); 4610 return err; 4611 } 4612 4613 static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = { 4614 .func = bpf_skb_get_tunnel_key, 4615 .gpl_only = false, 4616 .ret_type = RET_INTEGER, 4617 .arg1_type = ARG_PTR_TO_CTX, 4618 .arg2_type = ARG_PTR_TO_UNINIT_MEM, 4619 .arg3_type = ARG_CONST_SIZE, 4620 .arg4_type = ARG_ANYTHING, 4621 }; 4622 4623 BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size) 4624 { 4625 const struct ip_tunnel_info *info = skb_tunnel_info(skb); 4626 int err; 4627 4628 if (unlikely(!info || 4629 !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) { 4630 err = -ENOENT; 4631 goto err_clear; 4632 } 4633 if (unlikely(size < info->options_len)) { 4634 err = -ENOMEM; 4635 goto err_clear; 4636 } 4637 4638 ip_tunnel_info_opts_get(to, info); 4639 if (size > info->options_len) 4640 memset(to + info->options_len, 0, size - info->options_len); 4641 4642 return info->options_len; 4643 err_clear: 4644 memset(to, 0, size); 4645 return err; 4646 } 4647 4648 static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = { 4649 .func = bpf_skb_get_tunnel_opt, 4650 .gpl_only = false, 4651 .ret_type = RET_INTEGER, 4652 .arg1_type = ARG_PTR_TO_CTX, 4653 .arg2_type = ARG_PTR_TO_UNINIT_MEM, 4654 .arg3_type = ARG_CONST_SIZE, 4655 }; 4656 4657 static struct metadata_dst __percpu *md_dst; 4658 4659 BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb, 4660 const struct bpf_tunnel_key *, from, u32, size, u64, flags) 4661 { 4662 struct metadata_dst *md = this_cpu_ptr(md_dst); 4663 u8 compat[sizeof(struct bpf_tunnel_key)]; 4664 struct ip_tunnel_info *info; 4665 4666 if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX | 4667 BPF_F_DONT_FRAGMENT | BPF_F_SEQ_NUMBER | 4668 BPF_F_NO_TUNNEL_KEY))) 4669 return -EINVAL; 4670 if (unlikely(size != sizeof(struct bpf_tunnel_key))) { 4671 switch (size) { 4672 case offsetof(struct bpf_tunnel_key, local_ipv6[0]): 4673 case offsetof(struct bpf_tunnel_key, tunnel_label): 4674 case offsetof(struct bpf_tunnel_key, tunnel_ext): 4675 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): 4676 /* Fixup deprecated structure layouts here, so we have 4677 * a common path later on. 4678 */ 4679 memcpy(compat, from, size); 4680 memset(compat + size, 0, sizeof(compat) - size); 4681 from = (const struct bpf_tunnel_key *) compat; 4682 break; 4683 default: 4684 return -EINVAL; 4685 } 4686 } 4687 if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) || 4688 from->tunnel_ext)) 4689 return -EINVAL; 4690 4691 skb_dst_drop(skb); 4692 dst_hold((struct dst_entry *) md); 4693 skb_dst_set(skb, (struct dst_entry *) md); 4694 4695 info = &md->u.tun_info; 4696 memset(info, 0, sizeof(*info)); 4697 info->mode = IP_TUNNEL_INFO_TX; 4698 4699 info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE; 4700 if (flags & BPF_F_DONT_FRAGMENT) 4701 info->key.tun_flags |= TUNNEL_DONT_FRAGMENT; 4702 if (flags & BPF_F_ZERO_CSUM_TX) 4703 info->key.tun_flags &= ~TUNNEL_CSUM; 4704 if (flags & BPF_F_SEQ_NUMBER) 4705 info->key.tun_flags |= TUNNEL_SEQ; 4706 if (flags & BPF_F_NO_TUNNEL_KEY) 4707 info->key.tun_flags &= ~TUNNEL_KEY; 4708 4709 info->key.tun_id = cpu_to_be64(from->tunnel_id); 4710 info->key.tos = from->tunnel_tos; 4711 info->key.ttl = from->tunnel_ttl; 4712 4713 if (flags & BPF_F_TUNINFO_IPV6) { 4714 info->mode |= IP_TUNNEL_INFO_IPV6; 4715 memcpy(&info->key.u.ipv6.dst, from->remote_ipv6, 4716 sizeof(from->remote_ipv6)); 4717 memcpy(&info->key.u.ipv6.src, from->local_ipv6, 4718 sizeof(from->local_ipv6)); 4719 info->key.label = cpu_to_be32(from->tunnel_label) & 4720 IPV6_FLOWLABEL_MASK; 4721 } else { 4722 info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4); 4723 info->key.u.ipv4.src = cpu_to_be32(from->local_ipv4); 4724 info->key.flow_flags = FLOWI_FLAG_ANYSRC; 4725 } 4726 4727 return 0; 4728 } 4729 4730 static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = { 4731 .func = bpf_skb_set_tunnel_key, 4732 .gpl_only = false, 4733 .ret_type = RET_INTEGER, 4734 .arg1_type = ARG_PTR_TO_CTX, 4735 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4736 .arg3_type = ARG_CONST_SIZE, 4737 .arg4_type = ARG_ANYTHING, 4738 }; 4739 4740 BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb, 4741 const u8 *, from, u32, size) 4742 { 4743 struct ip_tunnel_info *info = skb_tunnel_info(skb); 4744 const struct metadata_dst *md = this_cpu_ptr(md_dst); 4745 4746 if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1)))) 4747 return -EINVAL; 4748 if (unlikely(size > IP_TUNNEL_OPTS_MAX)) 4749 return -ENOMEM; 4750 4751 ip_tunnel_info_opts_set(info, from, size, TUNNEL_OPTIONS_PRESENT); 4752 4753 return 0; 4754 } 4755 4756 static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = { 4757 .func = bpf_skb_set_tunnel_opt, 4758 .gpl_only = false, 4759 .ret_type = RET_INTEGER, 4760 .arg1_type = ARG_PTR_TO_CTX, 4761 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4762 .arg3_type = ARG_CONST_SIZE, 4763 }; 4764 4765 static const struct bpf_func_proto * 4766 bpf_get_skb_set_tunnel_proto(enum bpf_func_id which) 4767 { 4768 if (!md_dst) { 4769 struct metadata_dst __percpu *tmp; 4770 4771 tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX, 4772 METADATA_IP_TUNNEL, 4773 GFP_KERNEL); 4774 if (!tmp) 4775 return NULL; 4776 if (cmpxchg(&md_dst, NULL, tmp)) 4777 metadata_dst_free_percpu(tmp); 4778 } 4779 4780 switch (which) { 4781 case BPF_FUNC_skb_set_tunnel_key: 4782 return &bpf_skb_set_tunnel_key_proto; 4783 case BPF_FUNC_skb_set_tunnel_opt: 4784 return &bpf_skb_set_tunnel_opt_proto; 4785 default: 4786 return NULL; 4787 } 4788 } 4789 4790 BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map, 4791 u32, idx) 4792 { 4793 struct bpf_array *array = container_of(map, struct bpf_array, map); 4794 struct cgroup *cgrp; 4795 struct sock *sk; 4796 4797 sk = skb_to_full_sk(skb); 4798 if (!sk || !sk_fullsock(sk)) 4799 return -ENOENT; 4800 if (unlikely(idx >= array->map.max_entries)) 4801 return -E2BIG; 4802 4803 cgrp = READ_ONCE(array->ptrs[idx]); 4804 if (unlikely(!cgrp)) 4805 return -EAGAIN; 4806 4807 return sk_under_cgroup_hierarchy(sk, cgrp); 4808 } 4809 4810 static const struct bpf_func_proto bpf_skb_under_cgroup_proto = { 4811 .func = bpf_skb_under_cgroup, 4812 .gpl_only = false, 4813 .ret_type = RET_INTEGER, 4814 .arg1_type = ARG_PTR_TO_CTX, 4815 .arg2_type = ARG_CONST_MAP_PTR, 4816 .arg3_type = ARG_ANYTHING, 4817 }; 4818 4819 #ifdef CONFIG_SOCK_CGROUP_DATA 4820 static inline u64 __bpf_sk_cgroup_id(struct sock *sk) 4821 { 4822 struct cgroup *cgrp; 4823 4824 sk = sk_to_full_sk(sk); 4825 if (!sk || !sk_fullsock(sk)) 4826 return 0; 4827 4828 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); 4829 return cgroup_id(cgrp); 4830 } 4831 4832 BPF_CALL_1(bpf_skb_cgroup_id, const struct sk_buff *, skb) 4833 { 4834 return __bpf_sk_cgroup_id(skb->sk); 4835 } 4836 4837 static const struct bpf_func_proto bpf_skb_cgroup_id_proto = { 4838 .func = bpf_skb_cgroup_id, 4839 .gpl_only = false, 4840 .ret_type = RET_INTEGER, 4841 .arg1_type = ARG_PTR_TO_CTX, 4842 }; 4843 4844 static inline u64 __bpf_sk_ancestor_cgroup_id(struct sock *sk, 4845 int ancestor_level) 4846 { 4847 struct cgroup *ancestor; 4848 struct cgroup *cgrp; 4849 4850 sk = sk_to_full_sk(sk); 4851 if (!sk || !sk_fullsock(sk)) 4852 return 0; 4853 4854 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); 4855 ancestor = cgroup_ancestor(cgrp, ancestor_level); 4856 if (!ancestor) 4857 return 0; 4858 4859 return cgroup_id(ancestor); 4860 } 4861 4862 BPF_CALL_2(bpf_skb_ancestor_cgroup_id, const struct sk_buff *, skb, int, 4863 ancestor_level) 4864 { 4865 return __bpf_sk_ancestor_cgroup_id(skb->sk, ancestor_level); 4866 } 4867 4868 static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto = { 4869 .func = bpf_skb_ancestor_cgroup_id, 4870 .gpl_only = false, 4871 .ret_type = RET_INTEGER, 4872 .arg1_type = ARG_PTR_TO_CTX, 4873 .arg2_type = ARG_ANYTHING, 4874 }; 4875 4876 BPF_CALL_1(bpf_sk_cgroup_id, struct sock *, sk) 4877 { 4878 return __bpf_sk_cgroup_id(sk); 4879 } 4880 4881 static const struct bpf_func_proto bpf_sk_cgroup_id_proto = { 4882 .func = bpf_sk_cgroup_id, 4883 .gpl_only = false, 4884 .ret_type = RET_INTEGER, 4885 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 4886 }; 4887 4888 BPF_CALL_2(bpf_sk_ancestor_cgroup_id, struct sock *, sk, int, ancestor_level) 4889 { 4890 return __bpf_sk_ancestor_cgroup_id(sk, ancestor_level); 4891 } 4892 4893 static const struct bpf_func_proto bpf_sk_ancestor_cgroup_id_proto = { 4894 .func = bpf_sk_ancestor_cgroup_id, 4895 .gpl_only = false, 4896 .ret_type = RET_INTEGER, 4897 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 4898 .arg2_type = ARG_ANYTHING, 4899 }; 4900 #endif 4901 4902 static unsigned long bpf_xdp_copy(void *dst, const void *ctx, 4903 unsigned long off, unsigned long len) 4904 { 4905 struct xdp_buff *xdp = (struct xdp_buff *)ctx; 4906 4907 bpf_xdp_copy_buf(xdp, off, dst, len, false); 4908 return 0; 4909 } 4910 4911 BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map, 4912 u64, flags, void *, meta, u64, meta_size) 4913 { 4914 u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32; 4915 4916 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) 4917 return -EINVAL; 4918 4919 if (unlikely(!xdp || xdp_size > xdp_get_buff_len(xdp))) 4920 return -EFAULT; 4921 4922 return bpf_event_output(map, flags, meta, meta_size, xdp, 4923 xdp_size, bpf_xdp_copy); 4924 } 4925 4926 static const struct bpf_func_proto bpf_xdp_event_output_proto = { 4927 .func = bpf_xdp_event_output, 4928 .gpl_only = true, 4929 .ret_type = RET_INTEGER, 4930 .arg1_type = ARG_PTR_TO_CTX, 4931 .arg2_type = ARG_CONST_MAP_PTR, 4932 .arg3_type = ARG_ANYTHING, 4933 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4934 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4935 }; 4936 4937 BTF_ID_LIST_SINGLE(bpf_xdp_output_btf_ids, struct, xdp_buff) 4938 4939 const struct bpf_func_proto bpf_xdp_output_proto = { 4940 .func = bpf_xdp_event_output, 4941 .gpl_only = true, 4942 .ret_type = RET_INTEGER, 4943 .arg1_type = ARG_PTR_TO_BTF_ID, 4944 .arg1_btf_id = &bpf_xdp_output_btf_ids[0], 4945 .arg2_type = ARG_CONST_MAP_PTR, 4946 .arg3_type = ARG_ANYTHING, 4947 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4948 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4949 }; 4950 4951 BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb) 4952 { 4953 return skb->sk ? __sock_gen_cookie(skb->sk) : 0; 4954 } 4955 4956 static const struct bpf_func_proto bpf_get_socket_cookie_proto = { 4957 .func = bpf_get_socket_cookie, 4958 .gpl_only = false, 4959 .ret_type = RET_INTEGER, 4960 .arg1_type = ARG_PTR_TO_CTX, 4961 }; 4962 4963 BPF_CALL_1(bpf_get_socket_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx) 4964 { 4965 return __sock_gen_cookie(ctx->sk); 4966 } 4967 4968 static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto = { 4969 .func = bpf_get_socket_cookie_sock_addr, 4970 .gpl_only = false, 4971 .ret_type = RET_INTEGER, 4972 .arg1_type = ARG_PTR_TO_CTX, 4973 }; 4974 4975 BPF_CALL_1(bpf_get_socket_cookie_sock, struct sock *, ctx) 4976 { 4977 return __sock_gen_cookie(ctx); 4978 } 4979 4980 static const struct bpf_func_proto bpf_get_socket_cookie_sock_proto = { 4981 .func = bpf_get_socket_cookie_sock, 4982 .gpl_only = false, 4983 .ret_type = RET_INTEGER, 4984 .arg1_type = ARG_PTR_TO_CTX, 4985 }; 4986 4987 BPF_CALL_1(bpf_get_socket_ptr_cookie, struct sock *, sk) 4988 { 4989 return sk ? sock_gen_cookie(sk) : 0; 4990 } 4991 4992 const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto = { 4993 .func = bpf_get_socket_ptr_cookie, 4994 .gpl_only = false, 4995 .ret_type = RET_INTEGER, 4996 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON | PTR_MAYBE_NULL, 4997 }; 4998 4999 BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx) 5000 { 5001 return __sock_gen_cookie(ctx->sk); 5002 } 5003 5004 static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto = { 5005 .func = bpf_get_socket_cookie_sock_ops, 5006 .gpl_only = false, 5007 .ret_type = RET_INTEGER, 5008 .arg1_type = ARG_PTR_TO_CTX, 5009 }; 5010 5011 static u64 __bpf_get_netns_cookie(struct sock *sk) 5012 { 5013 const struct net *net = sk ? sock_net(sk) : &init_net; 5014 5015 return net->net_cookie; 5016 } 5017 5018 BPF_CALL_1(bpf_get_netns_cookie_sock, struct sock *, ctx) 5019 { 5020 return __bpf_get_netns_cookie(ctx); 5021 } 5022 5023 static const struct bpf_func_proto bpf_get_netns_cookie_sock_proto = { 5024 .func = bpf_get_netns_cookie_sock, 5025 .gpl_only = false, 5026 .ret_type = RET_INTEGER, 5027 .arg1_type = ARG_PTR_TO_CTX_OR_NULL, 5028 }; 5029 5030 BPF_CALL_1(bpf_get_netns_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx) 5031 { 5032 return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL); 5033 } 5034 5035 static const struct bpf_func_proto bpf_get_netns_cookie_sock_addr_proto = { 5036 .func = bpf_get_netns_cookie_sock_addr, 5037 .gpl_only = false, 5038 .ret_type = RET_INTEGER, 5039 .arg1_type = ARG_PTR_TO_CTX_OR_NULL, 5040 }; 5041 5042 BPF_CALL_1(bpf_get_netns_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx) 5043 { 5044 return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL); 5045 } 5046 5047 static const struct bpf_func_proto bpf_get_netns_cookie_sock_ops_proto = { 5048 .func = bpf_get_netns_cookie_sock_ops, 5049 .gpl_only = false, 5050 .ret_type = RET_INTEGER, 5051 .arg1_type = ARG_PTR_TO_CTX_OR_NULL, 5052 }; 5053 5054 BPF_CALL_1(bpf_get_netns_cookie_sk_msg, struct sk_msg *, ctx) 5055 { 5056 return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL); 5057 } 5058 5059 static const struct bpf_func_proto bpf_get_netns_cookie_sk_msg_proto = { 5060 .func = bpf_get_netns_cookie_sk_msg, 5061 .gpl_only = false, 5062 .ret_type = RET_INTEGER, 5063 .arg1_type = ARG_PTR_TO_CTX_OR_NULL, 5064 }; 5065 5066 BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb) 5067 { 5068 struct sock *sk = sk_to_full_sk(skb->sk); 5069 kuid_t kuid; 5070 5071 if (!sk || !sk_fullsock(sk)) 5072 return overflowuid; 5073 kuid = sock_net_uid(sock_net(sk), sk); 5074 return from_kuid_munged(sock_net(sk)->user_ns, kuid); 5075 } 5076 5077 static const struct bpf_func_proto bpf_get_socket_uid_proto = { 5078 .func = bpf_get_socket_uid, 5079 .gpl_only = false, 5080 .ret_type = RET_INTEGER, 5081 .arg1_type = ARG_PTR_TO_CTX, 5082 }; 5083 5084 static int sol_socket_sockopt(struct sock *sk, int optname, 5085 char *optval, int *optlen, 5086 bool getopt) 5087 { 5088 switch (optname) { 5089 case SO_REUSEADDR: 5090 case SO_SNDBUF: 5091 case SO_RCVBUF: 5092 case SO_KEEPALIVE: 5093 case SO_PRIORITY: 5094 case SO_REUSEPORT: 5095 case SO_RCVLOWAT: 5096 case SO_MARK: 5097 case SO_MAX_PACING_RATE: 5098 case SO_BINDTOIFINDEX: 5099 case SO_TXREHASH: 5100 if (*optlen != sizeof(int)) 5101 return -EINVAL; 5102 break; 5103 case SO_BINDTODEVICE: 5104 break; 5105 default: 5106 return -EINVAL; 5107 } 5108 5109 if (getopt) { 5110 if (optname == SO_BINDTODEVICE) 5111 return -EINVAL; 5112 return sk_getsockopt(sk, SOL_SOCKET, optname, 5113 KERNEL_SOCKPTR(optval), 5114 KERNEL_SOCKPTR(optlen)); 5115 } 5116 5117 return sk_setsockopt(sk, SOL_SOCKET, optname, 5118 KERNEL_SOCKPTR(optval), *optlen); 5119 } 5120 5121 static int bpf_sol_tcp_setsockopt(struct sock *sk, int optname, 5122 char *optval, int optlen) 5123 { 5124 struct tcp_sock *tp = tcp_sk(sk); 5125 unsigned long timeout; 5126 int val; 5127 5128 if (optlen != sizeof(int)) 5129 return -EINVAL; 5130 5131 val = *(int *)optval; 5132 5133 /* Only some options are supported */ 5134 switch (optname) { 5135 case TCP_BPF_IW: 5136 if (val <= 0 || tp->data_segs_out > tp->syn_data) 5137 return -EINVAL; 5138 tcp_snd_cwnd_set(tp, val); 5139 break; 5140 case TCP_BPF_SNDCWND_CLAMP: 5141 if (val <= 0) 5142 return -EINVAL; 5143 tp->snd_cwnd_clamp = val; 5144 tp->snd_ssthresh = val; 5145 break; 5146 case TCP_BPF_DELACK_MAX: 5147 timeout = usecs_to_jiffies(val); 5148 if (timeout > TCP_DELACK_MAX || 5149 timeout < TCP_TIMEOUT_MIN) 5150 return -EINVAL; 5151 inet_csk(sk)->icsk_delack_max = timeout; 5152 break; 5153 case TCP_BPF_RTO_MIN: 5154 timeout = usecs_to_jiffies(val); 5155 if (timeout > TCP_RTO_MIN || 5156 timeout < TCP_TIMEOUT_MIN) 5157 return -EINVAL; 5158 inet_csk(sk)->icsk_rto_min = timeout; 5159 break; 5160 default: 5161 return -EINVAL; 5162 } 5163 5164 return 0; 5165 } 5166 5167 static int sol_tcp_sockopt_congestion(struct sock *sk, char *optval, 5168 int *optlen, bool getopt) 5169 { 5170 struct tcp_sock *tp; 5171 int ret; 5172 5173 if (*optlen < 2) 5174 return -EINVAL; 5175 5176 if (getopt) { 5177 if (!inet_csk(sk)->icsk_ca_ops) 5178 return -EINVAL; 5179 /* BPF expects NULL-terminated tcp-cc string */ 5180 optval[--(*optlen)] = '\0'; 5181 return do_tcp_getsockopt(sk, SOL_TCP, TCP_CONGESTION, 5182 KERNEL_SOCKPTR(optval), 5183 KERNEL_SOCKPTR(optlen)); 5184 } 5185 5186 /* "cdg" is the only cc that alloc a ptr 5187 * in inet_csk_ca area. The bpf-tcp-cc may 5188 * overwrite this ptr after switching to cdg. 5189 */ 5190 if (*optlen >= sizeof("cdg") - 1 && !strncmp("cdg", optval, *optlen)) 5191 return -ENOTSUPP; 5192 5193 /* It stops this looping 5194 * 5195 * .init => bpf_setsockopt(tcp_cc) => .init => 5196 * bpf_setsockopt(tcp_cc)" => .init => .... 5197 * 5198 * The second bpf_setsockopt(tcp_cc) is not allowed 5199 * in order to break the loop when both .init 5200 * are the same bpf prog. 5201 * 5202 * This applies even the second bpf_setsockopt(tcp_cc) 5203 * does not cause a loop. This limits only the first 5204 * '.init' can call bpf_setsockopt(TCP_CONGESTION) to 5205 * pick a fallback cc (eg. peer does not support ECN) 5206 * and the second '.init' cannot fallback to 5207 * another. 5208 */ 5209 tp = tcp_sk(sk); 5210 if (tp->bpf_chg_cc_inprogress) 5211 return -EBUSY; 5212 5213 tp->bpf_chg_cc_inprogress = 1; 5214 ret = do_tcp_setsockopt(sk, SOL_TCP, TCP_CONGESTION, 5215 KERNEL_SOCKPTR(optval), *optlen); 5216 tp->bpf_chg_cc_inprogress = 0; 5217 return ret; 5218 } 5219 5220 static int sol_tcp_sockopt(struct sock *sk, int optname, 5221 char *optval, int *optlen, 5222 bool getopt) 5223 { 5224 if (sk->sk_protocol != IPPROTO_TCP) 5225 return -EINVAL; 5226 5227 switch (optname) { 5228 case TCP_NODELAY: 5229 case TCP_MAXSEG: 5230 case TCP_KEEPIDLE: 5231 case TCP_KEEPINTVL: 5232 case TCP_KEEPCNT: 5233 case TCP_SYNCNT: 5234 case TCP_WINDOW_CLAMP: 5235 case TCP_THIN_LINEAR_TIMEOUTS: 5236 case TCP_USER_TIMEOUT: 5237 case TCP_NOTSENT_LOWAT: 5238 case TCP_SAVE_SYN: 5239 if (*optlen != sizeof(int)) 5240 return -EINVAL; 5241 break; 5242 case TCP_CONGESTION: 5243 return sol_tcp_sockopt_congestion(sk, optval, optlen, getopt); 5244 case TCP_SAVED_SYN: 5245 if (*optlen < 1) 5246 return -EINVAL; 5247 break; 5248 default: 5249 if (getopt) 5250 return -EINVAL; 5251 return bpf_sol_tcp_setsockopt(sk, optname, optval, *optlen); 5252 } 5253 5254 if (getopt) { 5255 if (optname == TCP_SAVED_SYN) { 5256 struct tcp_sock *tp = tcp_sk(sk); 5257 5258 if (!tp->saved_syn || 5259 *optlen > tcp_saved_syn_len(tp->saved_syn)) 5260 return -EINVAL; 5261 memcpy(optval, tp->saved_syn->data, *optlen); 5262 /* It cannot free tp->saved_syn here because it 5263 * does not know if the user space still needs it. 5264 */ 5265 return 0; 5266 } 5267 5268 return do_tcp_getsockopt(sk, SOL_TCP, optname, 5269 KERNEL_SOCKPTR(optval), 5270 KERNEL_SOCKPTR(optlen)); 5271 } 5272 5273 return do_tcp_setsockopt(sk, SOL_TCP, optname, 5274 KERNEL_SOCKPTR(optval), *optlen); 5275 } 5276 5277 static int sol_ip_sockopt(struct sock *sk, int optname, 5278 char *optval, int *optlen, 5279 bool getopt) 5280 { 5281 if (sk->sk_family != AF_INET) 5282 return -EINVAL; 5283 5284 switch (optname) { 5285 case IP_TOS: 5286 if (*optlen != sizeof(int)) 5287 return -EINVAL; 5288 break; 5289 default: 5290 return -EINVAL; 5291 } 5292 5293 if (getopt) 5294 return do_ip_getsockopt(sk, SOL_IP, optname, 5295 KERNEL_SOCKPTR(optval), 5296 KERNEL_SOCKPTR(optlen)); 5297 5298 return do_ip_setsockopt(sk, SOL_IP, optname, 5299 KERNEL_SOCKPTR(optval), *optlen); 5300 } 5301 5302 static int sol_ipv6_sockopt(struct sock *sk, int optname, 5303 char *optval, int *optlen, 5304 bool getopt) 5305 { 5306 if (sk->sk_family != AF_INET6) 5307 return -EINVAL; 5308 5309 switch (optname) { 5310 case IPV6_TCLASS: 5311 case IPV6_AUTOFLOWLABEL: 5312 if (*optlen != sizeof(int)) 5313 return -EINVAL; 5314 break; 5315 default: 5316 return -EINVAL; 5317 } 5318 5319 if (getopt) 5320 return ipv6_bpf_stub->ipv6_getsockopt(sk, SOL_IPV6, optname, 5321 KERNEL_SOCKPTR(optval), 5322 KERNEL_SOCKPTR(optlen)); 5323 5324 return ipv6_bpf_stub->ipv6_setsockopt(sk, SOL_IPV6, optname, 5325 KERNEL_SOCKPTR(optval), *optlen); 5326 } 5327 5328 static int __bpf_setsockopt(struct sock *sk, int level, int optname, 5329 char *optval, int optlen) 5330 { 5331 if (!sk_fullsock(sk)) 5332 return -EINVAL; 5333 5334 if (level == SOL_SOCKET) 5335 return sol_socket_sockopt(sk, optname, optval, &optlen, false); 5336 else if (IS_ENABLED(CONFIG_INET) && level == SOL_IP) 5337 return sol_ip_sockopt(sk, optname, optval, &optlen, false); 5338 else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6) 5339 return sol_ipv6_sockopt(sk, optname, optval, &optlen, false); 5340 else if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP) 5341 return sol_tcp_sockopt(sk, optname, optval, &optlen, false); 5342 5343 return -EINVAL; 5344 } 5345 5346 static int _bpf_setsockopt(struct sock *sk, int level, int optname, 5347 char *optval, int optlen) 5348 { 5349 if (sk_fullsock(sk)) 5350 sock_owned_by_me(sk); 5351 return __bpf_setsockopt(sk, level, optname, optval, optlen); 5352 } 5353 5354 static int __bpf_getsockopt(struct sock *sk, int level, int optname, 5355 char *optval, int optlen) 5356 { 5357 int err, saved_optlen = optlen; 5358 5359 if (!sk_fullsock(sk)) { 5360 err = -EINVAL; 5361 goto done; 5362 } 5363 5364 if (level == SOL_SOCKET) 5365 err = sol_socket_sockopt(sk, optname, optval, &optlen, true); 5366 else if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP) 5367 err = sol_tcp_sockopt(sk, optname, optval, &optlen, true); 5368 else if (IS_ENABLED(CONFIG_INET) && level == SOL_IP) 5369 err = sol_ip_sockopt(sk, optname, optval, &optlen, true); 5370 else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6) 5371 err = sol_ipv6_sockopt(sk, optname, optval, &optlen, true); 5372 else 5373 err = -EINVAL; 5374 5375 done: 5376 if (err) 5377 optlen = 0; 5378 if (optlen < saved_optlen) 5379 memset(optval + optlen, 0, saved_optlen - optlen); 5380 return err; 5381 } 5382 5383 static int _bpf_getsockopt(struct sock *sk, int level, int optname, 5384 char *optval, int optlen) 5385 { 5386 if (sk_fullsock(sk)) 5387 sock_owned_by_me(sk); 5388 return __bpf_getsockopt(sk, level, optname, optval, optlen); 5389 } 5390 5391 BPF_CALL_5(bpf_sk_setsockopt, struct sock *, sk, int, level, 5392 int, optname, char *, optval, int, optlen) 5393 { 5394 return _bpf_setsockopt(sk, level, optname, optval, optlen); 5395 } 5396 5397 const struct bpf_func_proto bpf_sk_setsockopt_proto = { 5398 .func = bpf_sk_setsockopt, 5399 .gpl_only = false, 5400 .ret_type = RET_INTEGER, 5401 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 5402 .arg2_type = ARG_ANYTHING, 5403 .arg3_type = ARG_ANYTHING, 5404 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5405 .arg5_type = ARG_CONST_SIZE, 5406 }; 5407 5408 BPF_CALL_5(bpf_sk_getsockopt, struct sock *, sk, int, level, 5409 int, optname, char *, optval, int, optlen) 5410 { 5411 return _bpf_getsockopt(sk, level, optname, optval, optlen); 5412 } 5413 5414 const struct bpf_func_proto bpf_sk_getsockopt_proto = { 5415 .func = bpf_sk_getsockopt, 5416 .gpl_only = false, 5417 .ret_type = RET_INTEGER, 5418 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 5419 .arg2_type = ARG_ANYTHING, 5420 .arg3_type = ARG_ANYTHING, 5421 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 5422 .arg5_type = ARG_CONST_SIZE, 5423 }; 5424 5425 BPF_CALL_5(bpf_unlocked_sk_setsockopt, struct sock *, sk, int, level, 5426 int, optname, char *, optval, int, optlen) 5427 { 5428 return __bpf_setsockopt(sk, level, optname, optval, optlen); 5429 } 5430 5431 const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto = { 5432 .func = bpf_unlocked_sk_setsockopt, 5433 .gpl_only = false, 5434 .ret_type = RET_INTEGER, 5435 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 5436 .arg2_type = ARG_ANYTHING, 5437 .arg3_type = ARG_ANYTHING, 5438 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5439 .arg5_type = ARG_CONST_SIZE, 5440 }; 5441 5442 BPF_CALL_5(bpf_unlocked_sk_getsockopt, struct sock *, sk, int, level, 5443 int, optname, char *, optval, int, optlen) 5444 { 5445 return __bpf_getsockopt(sk, level, optname, optval, optlen); 5446 } 5447 5448 const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto = { 5449 .func = bpf_unlocked_sk_getsockopt, 5450 .gpl_only = false, 5451 .ret_type = RET_INTEGER, 5452 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 5453 .arg2_type = ARG_ANYTHING, 5454 .arg3_type = ARG_ANYTHING, 5455 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 5456 .arg5_type = ARG_CONST_SIZE, 5457 }; 5458 5459 BPF_CALL_5(bpf_sock_addr_setsockopt, struct bpf_sock_addr_kern *, ctx, 5460 int, level, int, optname, char *, optval, int, optlen) 5461 { 5462 return _bpf_setsockopt(ctx->sk, level, optname, optval, optlen); 5463 } 5464 5465 static const struct bpf_func_proto bpf_sock_addr_setsockopt_proto = { 5466 .func = bpf_sock_addr_setsockopt, 5467 .gpl_only = false, 5468 .ret_type = RET_INTEGER, 5469 .arg1_type = ARG_PTR_TO_CTX, 5470 .arg2_type = ARG_ANYTHING, 5471 .arg3_type = ARG_ANYTHING, 5472 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5473 .arg5_type = ARG_CONST_SIZE, 5474 }; 5475 5476 BPF_CALL_5(bpf_sock_addr_getsockopt, struct bpf_sock_addr_kern *, ctx, 5477 int, level, int, optname, char *, optval, int, optlen) 5478 { 5479 return _bpf_getsockopt(ctx->sk, level, optname, optval, optlen); 5480 } 5481 5482 static const struct bpf_func_proto bpf_sock_addr_getsockopt_proto = { 5483 .func = bpf_sock_addr_getsockopt, 5484 .gpl_only = false, 5485 .ret_type = RET_INTEGER, 5486 .arg1_type = ARG_PTR_TO_CTX, 5487 .arg2_type = ARG_ANYTHING, 5488 .arg3_type = ARG_ANYTHING, 5489 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 5490 .arg5_type = ARG_CONST_SIZE, 5491 }; 5492 5493 BPF_CALL_5(bpf_sock_ops_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, 5494 int, level, int, optname, char *, optval, int, optlen) 5495 { 5496 return _bpf_setsockopt(bpf_sock->sk, level, optname, optval, optlen); 5497 } 5498 5499 static const struct bpf_func_proto bpf_sock_ops_setsockopt_proto = { 5500 .func = bpf_sock_ops_setsockopt, 5501 .gpl_only = false, 5502 .ret_type = RET_INTEGER, 5503 .arg1_type = ARG_PTR_TO_CTX, 5504 .arg2_type = ARG_ANYTHING, 5505 .arg3_type = ARG_ANYTHING, 5506 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5507 .arg5_type = ARG_CONST_SIZE, 5508 }; 5509 5510 static int bpf_sock_ops_get_syn(struct bpf_sock_ops_kern *bpf_sock, 5511 int optname, const u8 **start) 5512 { 5513 struct sk_buff *syn_skb = bpf_sock->syn_skb; 5514 const u8 *hdr_start; 5515 int ret; 5516 5517 if (syn_skb) { 5518 /* sk is a request_sock here */ 5519 5520 if (optname == TCP_BPF_SYN) { 5521 hdr_start = syn_skb->data; 5522 ret = tcp_hdrlen(syn_skb); 5523 } else if (optname == TCP_BPF_SYN_IP) { 5524 hdr_start = skb_network_header(syn_skb); 5525 ret = skb_network_header_len(syn_skb) + 5526 tcp_hdrlen(syn_skb); 5527 } else { 5528 /* optname == TCP_BPF_SYN_MAC */ 5529 hdr_start = skb_mac_header(syn_skb); 5530 ret = skb_mac_header_len(syn_skb) + 5531 skb_network_header_len(syn_skb) + 5532 tcp_hdrlen(syn_skb); 5533 } 5534 } else { 5535 struct sock *sk = bpf_sock->sk; 5536 struct saved_syn *saved_syn; 5537 5538 if (sk->sk_state == TCP_NEW_SYN_RECV) 5539 /* synack retransmit. bpf_sock->syn_skb will 5540 * not be available. It has to resort to 5541 * saved_syn (if it is saved). 5542 */ 5543 saved_syn = inet_reqsk(sk)->saved_syn; 5544 else 5545 saved_syn = tcp_sk(sk)->saved_syn; 5546 5547 if (!saved_syn) 5548 return -ENOENT; 5549 5550 if (optname == TCP_BPF_SYN) { 5551 hdr_start = saved_syn->data + 5552 saved_syn->mac_hdrlen + 5553 saved_syn->network_hdrlen; 5554 ret = saved_syn->tcp_hdrlen; 5555 } else if (optname == TCP_BPF_SYN_IP) { 5556 hdr_start = saved_syn->data + 5557 saved_syn->mac_hdrlen; 5558 ret = saved_syn->network_hdrlen + 5559 saved_syn->tcp_hdrlen; 5560 } else { 5561 /* optname == TCP_BPF_SYN_MAC */ 5562 5563 /* TCP_SAVE_SYN may not have saved the mac hdr */ 5564 if (!saved_syn->mac_hdrlen) 5565 return -ENOENT; 5566 5567 hdr_start = saved_syn->data; 5568 ret = saved_syn->mac_hdrlen + 5569 saved_syn->network_hdrlen + 5570 saved_syn->tcp_hdrlen; 5571 } 5572 } 5573 5574 *start = hdr_start; 5575 return ret; 5576 } 5577 5578 BPF_CALL_5(bpf_sock_ops_getsockopt, struct bpf_sock_ops_kern *, bpf_sock, 5579 int, level, int, optname, char *, optval, int, optlen) 5580 { 5581 if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP && 5582 optname >= TCP_BPF_SYN && optname <= TCP_BPF_SYN_MAC) { 5583 int ret, copy_len = 0; 5584 const u8 *start; 5585 5586 ret = bpf_sock_ops_get_syn(bpf_sock, optname, &start); 5587 if (ret > 0) { 5588 copy_len = ret; 5589 if (optlen < copy_len) { 5590 copy_len = optlen; 5591 ret = -ENOSPC; 5592 } 5593 5594 memcpy(optval, start, copy_len); 5595 } 5596 5597 /* Zero out unused buffer at the end */ 5598 memset(optval + copy_len, 0, optlen - copy_len); 5599 5600 return ret; 5601 } 5602 5603 return _bpf_getsockopt(bpf_sock->sk, level, optname, optval, optlen); 5604 } 5605 5606 static const struct bpf_func_proto bpf_sock_ops_getsockopt_proto = { 5607 .func = bpf_sock_ops_getsockopt, 5608 .gpl_only = false, 5609 .ret_type = RET_INTEGER, 5610 .arg1_type = ARG_PTR_TO_CTX, 5611 .arg2_type = ARG_ANYTHING, 5612 .arg3_type = ARG_ANYTHING, 5613 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 5614 .arg5_type = ARG_CONST_SIZE, 5615 }; 5616 5617 BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock, 5618 int, argval) 5619 { 5620 struct sock *sk = bpf_sock->sk; 5621 int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS; 5622 5623 if (!IS_ENABLED(CONFIG_INET) || !sk_fullsock(sk)) 5624 return -EINVAL; 5625 5626 tcp_sk(sk)->bpf_sock_ops_cb_flags = val; 5627 5628 return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS); 5629 } 5630 5631 static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = { 5632 .func = bpf_sock_ops_cb_flags_set, 5633 .gpl_only = false, 5634 .ret_type = RET_INTEGER, 5635 .arg1_type = ARG_PTR_TO_CTX, 5636 .arg2_type = ARG_ANYTHING, 5637 }; 5638 5639 const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly; 5640 EXPORT_SYMBOL_GPL(ipv6_bpf_stub); 5641 5642 BPF_CALL_3(bpf_bind, struct bpf_sock_addr_kern *, ctx, struct sockaddr *, addr, 5643 int, addr_len) 5644 { 5645 #ifdef CONFIG_INET 5646 struct sock *sk = ctx->sk; 5647 u32 flags = BIND_FROM_BPF; 5648 int err; 5649 5650 err = -EINVAL; 5651 if (addr_len < offsetofend(struct sockaddr, sa_family)) 5652 return err; 5653 if (addr->sa_family == AF_INET) { 5654 if (addr_len < sizeof(struct sockaddr_in)) 5655 return err; 5656 if (((struct sockaddr_in *)addr)->sin_port == htons(0)) 5657 flags |= BIND_FORCE_ADDRESS_NO_PORT; 5658 return __inet_bind(sk, addr, addr_len, flags); 5659 #if IS_ENABLED(CONFIG_IPV6) 5660 } else if (addr->sa_family == AF_INET6) { 5661 if (addr_len < SIN6_LEN_RFC2133) 5662 return err; 5663 if (((struct sockaddr_in6 *)addr)->sin6_port == htons(0)) 5664 flags |= BIND_FORCE_ADDRESS_NO_PORT; 5665 /* ipv6_bpf_stub cannot be NULL, since it's called from 5666 * bpf_cgroup_inet6_connect hook and ipv6 is already loaded 5667 */ 5668 return ipv6_bpf_stub->inet6_bind(sk, addr, addr_len, flags); 5669 #endif /* CONFIG_IPV6 */ 5670 } 5671 #endif /* CONFIG_INET */ 5672 5673 return -EAFNOSUPPORT; 5674 } 5675 5676 static const struct bpf_func_proto bpf_bind_proto = { 5677 .func = bpf_bind, 5678 .gpl_only = false, 5679 .ret_type = RET_INTEGER, 5680 .arg1_type = ARG_PTR_TO_CTX, 5681 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5682 .arg3_type = ARG_CONST_SIZE, 5683 }; 5684 5685 #ifdef CONFIG_XFRM 5686 5687 #if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \ 5688 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES)) 5689 5690 struct metadata_dst __percpu *xfrm_bpf_md_dst; 5691 EXPORT_SYMBOL_GPL(xfrm_bpf_md_dst); 5692 5693 #endif 5694 5695 BPF_CALL_5(bpf_skb_get_xfrm_state, struct sk_buff *, skb, u32, index, 5696 struct bpf_xfrm_state *, to, u32, size, u64, flags) 5697 { 5698 const struct sec_path *sp = skb_sec_path(skb); 5699 const struct xfrm_state *x; 5700 5701 if (!sp || unlikely(index >= sp->len || flags)) 5702 goto err_clear; 5703 5704 x = sp->xvec[index]; 5705 5706 if (unlikely(size != sizeof(struct bpf_xfrm_state))) 5707 goto err_clear; 5708 5709 to->reqid = x->props.reqid; 5710 to->spi = x->id.spi; 5711 to->family = x->props.family; 5712 to->ext = 0; 5713 5714 if (to->family == AF_INET6) { 5715 memcpy(to->remote_ipv6, x->props.saddr.a6, 5716 sizeof(to->remote_ipv6)); 5717 } else { 5718 to->remote_ipv4 = x->props.saddr.a4; 5719 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); 5720 } 5721 5722 return 0; 5723 err_clear: 5724 memset(to, 0, size); 5725 return -EINVAL; 5726 } 5727 5728 static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto = { 5729 .func = bpf_skb_get_xfrm_state, 5730 .gpl_only = false, 5731 .ret_type = RET_INTEGER, 5732 .arg1_type = ARG_PTR_TO_CTX, 5733 .arg2_type = ARG_ANYTHING, 5734 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 5735 .arg4_type = ARG_CONST_SIZE, 5736 .arg5_type = ARG_ANYTHING, 5737 }; 5738 #endif 5739 5740 #if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6) 5741 static int bpf_fib_set_fwd_params(struct bpf_fib_lookup *params, u32 mtu) 5742 { 5743 params->h_vlan_TCI = 0; 5744 params->h_vlan_proto = 0; 5745 if (mtu) 5746 params->mtu_result = mtu; /* union with tot_len */ 5747 5748 return 0; 5749 } 5750 #endif 5751 5752 #if IS_ENABLED(CONFIG_INET) 5753 static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params, 5754 u32 flags, bool check_mtu) 5755 { 5756 struct fib_nh_common *nhc; 5757 struct in_device *in_dev; 5758 struct neighbour *neigh; 5759 struct net_device *dev; 5760 struct fib_result res; 5761 struct flowi4 fl4; 5762 u32 mtu = 0; 5763 int err; 5764 5765 dev = dev_get_by_index_rcu(net, params->ifindex); 5766 if (unlikely(!dev)) 5767 return -ENODEV; 5768 5769 /* verify forwarding is enabled on this interface */ 5770 in_dev = __in_dev_get_rcu(dev); 5771 if (unlikely(!in_dev || !IN_DEV_FORWARD(in_dev))) 5772 return BPF_FIB_LKUP_RET_FWD_DISABLED; 5773 5774 if (flags & BPF_FIB_LOOKUP_OUTPUT) { 5775 fl4.flowi4_iif = 1; 5776 fl4.flowi4_oif = params->ifindex; 5777 } else { 5778 fl4.flowi4_iif = params->ifindex; 5779 fl4.flowi4_oif = 0; 5780 } 5781 fl4.flowi4_tos = params->tos & IPTOS_RT_MASK; 5782 fl4.flowi4_scope = RT_SCOPE_UNIVERSE; 5783 fl4.flowi4_flags = 0; 5784 5785 fl4.flowi4_proto = params->l4_protocol; 5786 fl4.daddr = params->ipv4_dst; 5787 fl4.saddr = params->ipv4_src; 5788 fl4.fl4_sport = params->sport; 5789 fl4.fl4_dport = params->dport; 5790 fl4.flowi4_multipath_hash = 0; 5791 5792 if (flags & BPF_FIB_LOOKUP_DIRECT) { 5793 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; 5794 struct fib_table *tb; 5795 5796 if (flags & BPF_FIB_LOOKUP_TBID) { 5797 tbid = params->tbid; 5798 /* zero out for vlan output */ 5799 params->tbid = 0; 5800 } 5801 5802 tb = fib_get_table(net, tbid); 5803 if (unlikely(!tb)) 5804 return BPF_FIB_LKUP_RET_NOT_FWDED; 5805 5806 err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); 5807 } else { 5808 fl4.flowi4_mark = 0; 5809 fl4.flowi4_secid = 0; 5810 fl4.flowi4_tun_key.tun_id = 0; 5811 fl4.flowi4_uid = sock_net_uid(net, NULL); 5812 5813 err = fib_lookup(net, &fl4, &res, FIB_LOOKUP_NOREF); 5814 } 5815 5816 if (err) { 5817 /* map fib lookup errors to RTN_ type */ 5818 if (err == -EINVAL) 5819 return BPF_FIB_LKUP_RET_BLACKHOLE; 5820 if (err == -EHOSTUNREACH) 5821 return BPF_FIB_LKUP_RET_UNREACHABLE; 5822 if (err == -EACCES) 5823 return BPF_FIB_LKUP_RET_PROHIBIT; 5824 5825 return BPF_FIB_LKUP_RET_NOT_FWDED; 5826 } 5827 5828 if (res.type != RTN_UNICAST) 5829 return BPF_FIB_LKUP_RET_NOT_FWDED; 5830 5831 if (fib_info_num_path(res.fi) > 1) 5832 fib_select_path(net, &res, &fl4, NULL); 5833 5834 if (check_mtu) { 5835 mtu = ip_mtu_from_fib_result(&res, params->ipv4_dst); 5836 if (params->tot_len > mtu) { 5837 params->mtu_result = mtu; /* union with tot_len */ 5838 return BPF_FIB_LKUP_RET_FRAG_NEEDED; 5839 } 5840 } 5841 5842 nhc = res.nhc; 5843 5844 /* do not handle lwt encaps right now */ 5845 if (nhc->nhc_lwtstate) 5846 return BPF_FIB_LKUP_RET_UNSUPP_LWT; 5847 5848 dev = nhc->nhc_dev; 5849 5850 params->rt_metric = res.fi->fib_priority; 5851 params->ifindex = dev->ifindex; 5852 5853 /* xdp and cls_bpf programs are run in RCU-bh so 5854 * rcu_read_lock_bh is not needed here 5855 */ 5856 if (likely(nhc->nhc_gw_family != AF_INET6)) { 5857 if (nhc->nhc_gw_family) 5858 params->ipv4_dst = nhc->nhc_gw.ipv4; 5859 } else { 5860 struct in6_addr *dst = (struct in6_addr *)params->ipv6_dst; 5861 5862 params->family = AF_INET6; 5863 *dst = nhc->nhc_gw.ipv6; 5864 } 5865 5866 if (flags & BPF_FIB_LOOKUP_SKIP_NEIGH) 5867 goto set_fwd_params; 5868 5869 if (likely(nhc->nhc_gw_family != AF_INET6)) 5870 neigh = __ipv4_neigh_lookup_noref(dev, 5871 (__force u32)params->ipv4_dst); 5872 else 5873 neigh = __ipv6_neigh_lookup_noref_stub(dev, params->ipv6_dst); 5874 5875 if (!neigh || !(READ_ONCE(neigh->nud_state) & NUD_VALID)) 5876 return BPF_FIB_LKUP_RET_NO_NEIGH; 5877 memcpy(params->dmac, neigh->ha, ETH_ALEN); 5878 memcpy(params->smac, dev->dev_addr, ETH_ALEN); 5879 5880 set_fwd_params: 5881 return bpf_fib_set_fwd_params(params, mtu); 5882 } 5883 #endif 5884 5885 #if IS_ENABLED(CONFIG_IPV6) 5886 static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params, 5887 u32 flags, bool check_mtu) 5888 { 5889 struct in6_addr *src = (struct in6_addr *) params->ipv6_src; 5890 struct in6_addr *dst = (struct in6_addr *) params->ipv6_dst; 5891 struct fib6_result res = {}; 5892 struct neighbour *neigh; 5893 struct net_device *dev; 5894 struct inet6_dev *idev; 5895 struct flowi6 fl6; 5896 int strict = 0; 5897 int oif, err; 5898 u32 mtu = 0; 5899 5900 /* link local addresses are never forwarded */ 5901 if (rt6_need_strict(dst) || rt6_need_strict(src)) 5902 return BPF_FIB_LKUP_RET_NOT_FWDED; 5903 5904 dev = dev_get_by_index_rcu(net, params->ifindex); 5905 if (unlikely(!dev)) 5906 return -ENODEV; 5907 5908 idev = __in6_dev_get_safely(dev); 5909 if (unlikely(!idev || !idev->cnf.forwarding)) 5910 return BPF_FIB_LKUP_RET_FWD_DISABLED; 5911 5912 if (flags & BPF_FIB_LOOKUP_OUTPUT) { 5913 fl6.flowi6_iif = 1; 5914 oif = fl6.flowi6_oif = params->ifindex; 5915 } else { 5916 oif = fl6.flowi6_iif = params->ifindex; 5917 fl6.flowi6_oif = 0; 5918 strict = RT6_LOOKUP_F_HAS_SADDR; 5919 } 5920 fl6.flowlabel = params->flowinfo; 5921 fl6.flowi6_scope = 0; 5922 fl6.flowi6_flags = 0; 5923 fl6.mp_hash = 0; 5924 5925 fl6.flowi6_proto = params->l4_protocol; 5926 fl6.daddr = *dst; 5927 fl6.saddr = *src; 5928 fl6.fl6_sport = params->sport; 5929 fl6.fl6_dport = params->dport; 5930 5931 if (flags & BPF_FIB_LOOKUP_DIRECT) { 5932 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; 5933 struct fib6_table *tb; 5934 5935 if (flags & BPF_FIB_LOOKUP_TBID) { 5936 tbid = params->tbid; 5937 /* zero out for vlan output */ 5938 params->tbid = 0; 5939 } 5940 5941 tb = ipv6_stub->fib6_get_table(net, tbid); 5942 if (unlikely(!tb)) 5943 return BPF_FIB_LKUP_RET_NOT_FWDED; 5944 5945 err = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6, &res, 5946 strict); 5947 } else { 5948 fl6.flowi6_mark = 0; 5949 fl6.flowi6_secid = 0; 5950 fl6.flowi6_tun_key.tun_id = 0; 5951 fl6.flowi6_uid = sock_net_uid(net, NULL); 5952 5953 err = ipv6_stub->fib6_lookup(net, oif, &fl6, &res, strict); 5954 } 5955 5956 if (unlikely(err || IS_ERR_OR_NULL(res.f6i) || 5957 res.f6i == net->ipv6.fib6_null_entry)) 5958 return BPF_FIB_LKUP_RET_NOT_FWDED; 5959 5960 switch (res.fib6_type) { 5961 /* only unicast is forwarded */ 5962 case RTN_UNICAST: 5963 break; 5964 case RTN_BLACKHOLE: 5965 return BPF_FIB_LKUP_RET_BLACKHOLE; 5966 case RTN_UNREACHABLE: 5967 return BPF_FIB_LKUP_RET_UNREACHABLE; 5968 case RTN_PROHIBIT: 5969 return BPF_FIB_LKUP_RET_PROHIBIT; 5970 default: 5971 return BPF_FIB_LKUP_RET_NOT_FWDED; 5972 } 5973 5974 ipv6_stub->fib6_select_path(net, &res, &fl6, fl6.flowi6_oif, 5975 fl6.flowi6_oif != 0, NULL, strict); 5976 5977 if (check_mtu) { 5978 mtu = ipv6_stub->ip6_mtu_from_fib6(&res, dst, src); 5979 if (params->tot_len > mtu) { 5980 params->mtu_result = mtu; /* union with tot_len */ 5981 return BPF_FIB_LKUP_RET_FRAG_NEEDED; 5982 } 5983 } 5984 5985 if (res.nh->fib_nh_lws) 5986 return BPF_FIB_LKUP_RET_UNSUPP_LWT; 5987 5988 if (res.nh->fib_nh_gw_family) 5989 *dst = res.nh->fib_nh_gw6; 5990 5991 dev = res.nh->fib_nh_dev; 5992 params->rt_metric = res.f6i->fib6_metric; 5993 params->ifindex = dev->ifindex; 5994 5995 if (flags & BPF_FIB_LOOKUP_SKIP_NEIGH) 5996 goto set_fwd_params; 5997 5998 /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is 5999 * not needed here. 6000 */ 6001 neigh = __ipv6_neigh_lookup_noref_stub(dev, dst); 6002 if (!neigh || !(READ_ONCE(neigh->nud_state) & NUD_VALID)) 6003 return BPF_FIB_LKUP_RET_NO_NEIGH; 6004 memcpy(params->dmac, neigh->ha, ETH_ALEN); 6005 memcpy(params->smac, dev->dev_addr, ETH_ALEN); 6006 6007 set_fwd_params: 6008 return bpf_fib_set_fwd_params(params, mtu); 6009 } 6010 #endif 6011 6012 #define BPF_FIB_LOOKUP_MASK (BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT | \ 6013 BPF_FIB_LOOKUP_SKIP_NEIGH | BPF_FIB_LOOKUP_TBID) 6014 6015 BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx, 6016 struct bpf_fib_lookup *, params, int, plen, u32, flags) 6017 { 6018 if (plen < sizeof(*params)) 6019 return -EINVAL; 6020 6021 if (flags & ~BPF_FIB_LOOKUP_MASK) 6022 return -EINVAL; 6023 6024 switch (params->family) { 6025 #if IS_ENABLED(CONFIG_INET) 6026 case AF_INET: 6027 return bpf_ipv4_fib_lookup(dev_net(ctx->rxq->dev), params, 6028 flags, true); 6029 #endif 6030 #if IS_ENABLED(CONFIG_IPV6) 6031 case AF_INET6: 6032 return bpf_ipv6_fib_lookup(dev_net(ctx->rxq->dev), params, 6033 flags, true); 6034 #endif 6035 } 6036 return -EAFNOSUPPORT; 6037 } 6038 6039 static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = { 6040 .func = bpf_xdp_fib_lookup, 6041 .gpl_only = true, 6042 .ret_type = RET_INTEGER, 6043 .arg1_type = ARG_PTR_TO_CTX, 6044 .arg2_type = ARG_PTR_TO_MEM, 6045 .arg3_type = ARG_CONST_SIZE, 6046 .arg4_type = ARG_ANYTHING, 6047 }; 6048 6049 BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb, 6050 struct bpf_fib_lookup *, params, int, plen, u32, flags) 6051 { 6052 struct net *net = dev_net(skb->dev); 6053 int rc = -EAFNOSUPPORT; 6054 bool check_mtu = false; 6055 6056 if (plen < sizeof(*params)) 6057 return -EINVAL; 6058 6059 if (flags & ~BPF_FIB_LOOKUP_MASK) 6060 return -EINVAL; 6061 6062 if (params->tot_len) 6063 check_mtu = true; 6064 6065 switch (params->family) { 6066 #if IS_ENABLED(CONFIG_INET) 6067 case AF_INET: 6068 rc = bpf_ipv4_fib_lookup(net, params, flags, check_mtu); 6069 break; 6070 #endif 6071 #if IS_ENABLED(CONFIG_IPV6) 6072 case AF_INET6: 6073 rc = bpf_ipv6_fib_lookup(net, params, flags, check_mtu); 6074 break; 6075 #endif 6076 } 6077 6078 if (rc == BPF_FIB_LKUP_RET_SUCCESS && !check_mtu) { 6079 struct net_device *dev; 6080 6081 /* When tot_len isn't provided by user, check skb 6082 * against MTU of FIB lookup resulting net_device 6083 */ 6084 dev = dev_get_by_index_rcu(net, params->ifindex); 6085 if (!is_skb_forwardable(dev, skb)) 6086 rc = BPF_FIB_LKUP_RET_FRAG_NEEDED; 6087 6088 params->mtu_result = dev->mtu; /* union with tot_len */ 6089 } 6090 6091 return rc; 6092 } 6093 6094 static const struct bpf_func_proto bpf_skb_fib_lookup_proto = { 6095 .func = bpf_skb_fib_lookup, 6096 .gpl_only = true, 6097 .ret_type = RET_INTEGER, 6098 .arg1_type = ARG_PTR_TO_CTX, 6099 .arg2_type = ARG_PTR_TO_MEM, 6100 .arg3_type = ARG_CONST_SIZE, 6101 .arg4_type = ARG_ANYTHING, 6102 }; 6103 6104 static struct net_device *__dev_via_ifindex(struct net_device *dev_curr, 6105 u32 ifindex) 6106 { 6107 struct net *netns = dev_net(dev_curr); 6108 6109 /* Non-redirect use-cases can use ifindex=0 and save ifindex lookup */ 6110 if (ifindex == 0) 6111 return dev_curr; 6112 6113 return dev_get_by_index_rcu(netns, ifindex); 6114 } 6115 6116 BPF_CALL_5(bpf_skb_check_mtu, struct sk_buff *, skb, 6117 u32, ifindex, u32 *, mtu_len, s32, len_diff, u64, flags) 6118 { 6119 int ret = BPF_MTU_CHK_RET_FRAG_NEEDED; 6120 struct net_device *dev = skb->dev; 6121 int skb_len, dev_len; 6122 int mtu; 6123 6124 if (unlikely(flags & ~(BPF_MTU_CHK_SEGS))) 6125 return -EINVAL; 6126 6127 if (unlikely(flags & BPF_MTU_CHK_SEGS && (len_diff || *mtu_len))) 6128 return -EINVAL; 6129 6130 dev = __dev_via_ifindex(dev, ifindex); 6131 if (unlikely(!dev)) 6132 return -ENODEV; 6133 6134 mtu = READ_ONCE(dev->mtu); 6135 6136 dev_len = mtu + dev->hard_header_len; 6137 6138 /* If set use *mtu_len as input, L3 as iph->tot_len (like fib_lookup) */ 6139 skb_len = *mtu_len ? *mtu_len + dev->hard_header_len : skb->len; 6140 6141 skb_len += len_diff; /* minus result pass check */ 6142 if (skb_len <= dev_len) { 6143 ret = BPF_MTU_CHK_RET_SUCCESS; 6144 goto out; 6145 } 6146 /* At this point, skb->len exceed MTU, but as it include length of all 6147 * segments, it can still be below MTU. The SKB can possibly get 6148 * re-segmented in transmit path (see validate_xmit_skb). Thus, user 6149 * must choose if segs are to be MTU checked. 6150 */ 6151 if (skb_is_gso(skb)) { 6152 ret = BPF_MTU_CHK_RET_SUCCESS; 6153 6154 if (flags & BPF_MTU_CHK_SEGS && 6155 !skb_gso_validate_network_len(skb, mtu)) 6156 ret = BPF_MTU_CHK_RET_SEGS_TOOBIG; 6157 } 6158 out: 6159 /* BPF verifier guarantees valid pointer */ 6160 *mtu_len = mtu; 6161 6162 return ret; 6163 } 6164 6165 BPF_CALL_5(bpf_xdp_check_mtu, struct xdp_buff *, xdp, 6166 u32, ifindex, u32 *, mtu_len, s32, len_diff, u64, flags) 6167 { 6168 struct net_device *dev = xdp->rxq->dev; 6169 int xdp_len = xdp->data_end - xdp->data; 6170 int ret = BPF_MTU_CHK_RET_SUCCESS; 6171 int mtu, dev_len; 6172 6173 /* XDP variant doesn't support multi-buffer segment check (yet) */ 6174 if (unlikely(flags)) 6175 return -EINVAL; 6176 6177 dev = __dev_via_ifindex(dev, ifindex); 6178 if (unlikely(!dev)) 6179 return -ENODEV; 6180 6181 mtu = READ_ONCE(dev->mtu); 6182 6183 /* Add L2-header as dev MTU is L3 size */ 6184 dev_len = mtu + dev->hard_header_len; 6185 6186 /* Use *mtu_len as input, L3 as iph->tot_len (like fib_lookup) */ 6187 if (*mtu_len) 6188 xdp_len = *mtu_len + dev->hard_header_len; 6189 6190 xdp_len += len_diff; /* minus result pass check */ 6191 if (xdp_len > dev_len) 6192 ret = BPF_MTU_CHK_RET_FRAG_NEEDED; 6193 6194 /* BPF verifier guarantees valid pointer */ 6195 *mtu_len = mtu; 6196 6197 return ret; 6198 } 6199 6200 static const struct bpf_func_proto bpf_skb_check_mtu_proto = { 6201 .func = bpf_skb_check_mtu, 6202 .gpl_only = true, 6203 .ret_type = RET_INTEGER, 6204 .arg1_type = ARG_PTR_TO_CTX, 6205 .arg2_type = ARG_ANYTHING, 6206 .arg3_type = ARG_PTR_TO_INT, 6207 .arg4_type = ARG_ANYTHING, 6208 .arg5_type = ARG_ANYTHING, 6209 }; 6210 6211 static const struct bpf_func_proto bpf_xdp_check_mtu_proto = { 6212 .func = bpf_xdp_check_mtu, 6213 .gpl_only = true, 6214 .ret_type = RET_INTEGER, 6215 .arg1_type = ARG_PTR_TO_CTX, 6216 .arg2_type = ARG_ANYTHING, 6217 .arg3_type = ARG_PTR_TO_INT, 6218 .arg4_type = ARG_ANYTHING, 6219 .arg5_type = ARG_ANYTHING, 6220 }; 6221 6222 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 6223 static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len) 6224 { 6225 int err; 6226 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)hdr; 6227 6228 if (!seg6_validate_srh(srh, len, false)) 6229 return -EINVAL; 6230 6231 switch (type) { 6232 case BPF_LWT_ENCAP_SEG6_INLINE: 6233 if (skb->protocol != htons(ETH_P_IPV6)) 6234 return -EBADMSG; 6235 6236 err = seg6_do_srh_inline(skb, srh); 6237 break; 6238 case BPF_LWT_ENCAP_SEG6: 6239 skb_reset_inner_headers(skb); 6240 skb->encapsulation = 1; 6241 err = seg6_do_srh_encap(skb, srh, IPPROTO_IPV6); 6242 break; 6243 default: 6244 return -EINVAL; 6245 } 6246 6247 bpf_compute_data_pointers(skb); 6248 if (err) 6249 return err; 6250 6251 skb_set_transport_header(skb, sizeof(struct ipv6hdr)); 6252 6253 return seg6_lookup_nexthop(skb, NULL, 0); 6254 } 6255 #endif /* CONFIG_IPV6_SEG6_BPF */ 6256 6257 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 6258 static int bpf_push_ip_encap(struct sk_buff *skb, void *hdr, u32 len, 6259 bool ingress) 6260 { 6261 return bpf_lwt_push_ip_encap(skb, hdr, len, ingress); 6262 } 6263 #endif 6264 6265 BPF_CALL_4(bpf_lwt_in_push_encap, struct sk_buff *, skb, u32, type, void *, hdr, 6266 u32, len) 6267 { 6268 switch (type) { 6269 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 6270 case BPF_LWT_ENCAP_SEG6: 6271 case BPF_LWT_ENCAP_SEG6_INLINE: 6272 return bpf_push_seg6_encap(skb, type, hdr, len); 6273 #endif 6274 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 6275 case BPF_LWT_ENCAP_IP: 6276 return bpf_push_ip_encap(skb, hdr, len, true /* ingress */); 6277 #endif 6278 default: 6279 return -EINVAL; 6280 } 6281 } 6282 6283 BPF_CALL_4(bpf_lwt_xmit_push_encap, struct sk_buff *, skb, u32, type, 6284 void *, hdr, u32, len) 6285 { 6286 switch (type) { 6287 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 6288 case BPF_LWT_ENCAP_IP: 6289 return bpf_push_ip_encap(skb, hdr, len, false /* egress */); 6290 #endif 6291 default: 6292 return -EINVAL; 6293 } 6294 } 6295 6296 static const struct bpf_func_proto bpf_lwt_in_push_encap_proto = { 6297 .func = bpf_lwt_in_push_encap, 6298 .gpl_only = false, 6299 .ret_type = RET_INTEGER, 6300 .arg1_type = ARG_PTR_TO_CTX, 6301 .arg2_type = ARG_ANYTHING, 6302 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6303 .arg4_type = ARG_CONST_SIZE 6304 }; 6305 6306 static const struct bpf_func_proto bpf_lwt_xmit_push_encap_proto = { 6307 .func = bpf_lwt_xmit_push_encap, 6308 .gpl_only = false, 6309 .ret_type = RET_INTEGER, 6310 .arg1_type = ARG_PTR_TO_CTX, 6311 .arg2_type = ARG_ANYTHING, 6312 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6313 .arg4_type = ARG_CONST_SIZE 6314 }; 6315 6316 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 6317 BPF_CALL_4(bpf_lwt_seg6_store_bytes, struct sk_buff *, skb, u32, offset, 6318 const void *, from, u32, len) 6319 { 6320 struct seg6_bpf_srh_state *srh_state = 6321 this_cpu_ptr(&seg6_bpf_srh_states); 6322 struct ipv6_sr_hdr *srh = srh_state->srh; 6323 void *srh_tlvs, *srh_end, *ptr; 6324 int srhoff = 0; 6325 6326 if (srh == NULL) 6327 return -EINVAL; 6328 6329 srh_tlvs = (void *)((char *)srh + ((srh->first_segment + 1) << 4)); 6330 srh_end = (void *)((char *)srh + sizeof(*srh) + srh_state->hdrlen); 6331 6332 ptr = skb->data + offset; 6333 if (ptr >= srh_tlvs && ptr + len <= srh_end) 6334 srh_state->valid = false; 6335 else if (ptr < (void *)&srh->flags || 6336 ptr + len > (void *)&srh->segments) 6337 return -EFAULT; 6338 6339 if (unlikely(bpf_try_make_writable(skb, offset + len))) 6340 return -EFAULT; 6341 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) 6342 return -EINVAL; 6343 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 6344 6345 memcpy(skb->data + offset, from, len); 6346 return 0; 6347 } 6348 6349 static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto = { 6350 .func = bpf_lwt_seg6_store_bytes, 6351 .gpl_only = false, 6352 .ret_type = RET_INTEGER, 6353 .arg1_type = ARG_PTR_TO_CTX, 6354 .arg2_type = ARG_ANYTHING, 6355 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6356 .arg4_type = ARG_CONST_SIZE 6357 }; 6358 6359 static void bpf_update_srh_state(struct sk_buff *skb) 6360 { 6361 struct seg6_bpf_srh_state *srh_state = 6362 this_cpu_ptr(&seg6_bpf_srh_states); 6363 int srhoff = 0; 6364 6365 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) { 6366 srh_state->srh = NULL; 6367 } else { 6368 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 6369 srh_state->hdrlen = srh_state->srh->hdrlen << 3; 6370 srh_state->valid = true; 6371 } 6372 } 6373 6374 BPF_CALL_4(bpf_lwt_seg6_action, struct sk_buff *, skb, 6375 u32, action, void *, param, u32, param_len) 6376 { 6377 struct seg6_bpf_srh_state *srh_state = 6378 this_cpu_ptr(&seg6_bpf_srh_states); 6379 int hdroff = 0; 6380 int err; 6381 6382 switch (action) { 6383 case SEG6_LOCAL_ACTION_END_X: 6384 if (!seg6_bpf_has_valid_srh(skb)) 6385 return -EBADMSG; 6386 if (param_len != sizeof(struct in6_addr)) 6387 return -EINVAL; 6388 return seg6_lookup_nexthop(skb, (struct in6_addr *)param, 0); 6389 case SEG6_LOCAL_ACTION_END_T: 6390 if (!seg6_bpf_has_valid_srh(skb)) 6391 return -EBADMSG; 6392 if (param_len != sizeof(int)) 6393 return -EINVAL; 6394 return seg6_lookup_nexthop(skb, NULL, *(int *)param); 6395 case SEG6_LOCAL_ACTION_END_DT6: 6396 if (!seg6_bpf_has_valid_srh(skb)) 6397 return -EBADMSG; 6398 if (param_len != sizeof(int)) 6399 return -EINVAL; 6400 6401 if (ipv6_find_hdr(skb, &hdroff, IPPROTO_IPV6, NULL, NULL) < 0) 6402 return -EBADMSG; 6403 if (!pskb_pull(skb, hdroff)) 6404 return -EBADMSG; 6405 6406 skb_postpull_rcsum(skb, skb_network_header(skb), hdroff); 6407 skb_reset_network_header(skb); 6408 skb_reset_transport_header(skb); 6409 skb->encapsulation = 0; 6410 6411 bpf_compute_data_pointers(skb); 6412 bpf_update_srh_state(skb); 6413 return seg6_lookup_nexthop(skb, NULL, *(int *)param); 6414 case SEG6_LOCAL_ACTION_END_B6: 6415 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) 6416 return -EBADMSG; 6417 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6_INLINE, 6418 param, param_len); 6419 if (!err) 6420 bpf_update_srh_state(skb); 6421 6422 return err; 6423 case SEG6_LOCAL_ACTION_END_B6_ENCAP: 6424 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) 6425 return -EBADMSG; 6426 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6, 6427 param, param_len); 6428 if (!err) 6429 bpf_update_srh_state(skb); 6430 6431 return err; 6432 default: 6433 return -EINVAL; 6434 } 6435 } 6436 6437 static const struct bpf_func_proto bpf_lwt_seg6_action_proto = { 6438 .func = bpf_lwt_seg6_action, 6439 .gpl_only = false, 6440 .ret_type = RET_INTEGER, 6441 .arg1_type = ARG_PTR_TO_CTX, 6442 .arg2_type = ARG_ANYTHING, 6443 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6444 .arg4_type = ARG_CONST_SIZE 6445 }; 6446 6447 BPF_CALL_3(bpf_lwt_seg6_adjust_srh, struct sk_buff *, skb, u32, offset, 6448 s32, len) 6449 { 6450 struct seg6_bpf_srh_state *srh_state = 6451 this_cpu_ptr(&seg6_bpf_srh_states); 6452 struct ipv6_sr_hdr *srh = srh_state->srh; 6453 void *srh_end, *srh_tlvs, *ptr; 6454 struct ipv6hdr *hdr; 6455 int srhoff = 0; 6456 int ret; 6457 6458 if (unlikely(srh == NULL)) 6459 return -EINVAL; 6460 6461 srh_tlvs = (void *)((unsigned char *)srh + sizeof(*srh) + 6462 ((srh->first_segment + 1) << 4)); 6463 srh_end = (void *)((unsigned char *)srh + sizeof(*srh) + 6464 srh_state->hdrlen); 6465 ptr = skb->data + offset; 6466 6467 if (unlikely(ptr < srh_tlvs || ptr > srh_end)) 6468 return -EFAULT; 6469 if (unlikely(len < 0 && (void *)((char *)ptr - len) > srh_end)) 6470 return -EFAULT; 6471 6472 if (len > 0) { 6473 ret = skb_cow_head(skb, len); 6474 if (unlikely(ret < 0)) 6475 return ret; 6476 6477 ret = bpf_skb_net_hdr_push(skb, offset, len); 6478 } else { 6479 ret = bpf_skb_net_hdr_pop(skb, offset, -1 * len); 6480 } 6481 6482 bpf_compute_data_pointers(skb); 6483 if (unlikely(ret < 0)) 6484 return ret; 6485 6486 hdr = (struct ipv6hdr *)skb->data; 6487 hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); 6488 6489 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) 6490 return -EINVAL; 6491 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 6492 srh_state->hdrlen += len; 6493 srh_state->valid = false; 6494 return 0; 6495 } 6496 6497 static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = { 6498 .func = bpf_lwt_seg6_adjust_srh, 6499 .gpl_only = false, 6500 .ret_type = RET_INTEGER, 6501 .arg1_type = ARG_PTR_TO_CTX, 6502 .arg2_type = ARG_ANYTHING, 6503 .arg3_type = ARG_ANYTHING, 6504 }; 6505 #endif /* CONFIG_IPV6_SEG6_BPF */ 6506 6507 #ifdef CONFIG_INET 6508 static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple, 6509 int dif, int sdif, u8 family, u8 proto) 6510 { 6511 struct inet_hashinfo *hinfo = net->ipv4.tcp_death_row.hashinfo; 6512 bool refcounted = false; 6513 struct sock *sk = NULL; 6514 6515 if (family == AF_INET) { 6516 __be32 src4 = tuple->ipv4.saddr; 6517 __be32 dst4 = tuple->ipv4.daddr; 6518 6519 if (proto == IPPROTO_TCP) 6520 sk = __inet_lookup(net, hinfo, NULL, 0, 6521 src4, tuple->ipv4.sport, 6522 dst4, tuple->ipv4.dport, 6523 dif, sdif, &refcounted); 6524 else 6525 sk = __udp4_lib_lookup(net, src4, tuple->ipv4.sport, 6526 dst4, tuple->ipv4.dport, 6527 dif, sdif, net->ipv4.udp_table, NULL); 6528 #if IS_ENABLED(CONFIG_IPV6) 6529 } else { 6530 struct in6_addr *src6 = (struct in6_addr *)&tuple->ipv6.saddr; 6531 struct in6_addr *dst6 = (struct in6_addr *)&tuple->ipv6.daddr; 6532 6533 if (proto == IPPROTO_TCP) 6534 sk = __inet6_lookup(net, hinfo, NULL, 0, 6535 src6, tuple->ipv6.sport, 6536 dst6, ntohs(tuple->ipv6.dport), 6537 dif, sdif, &refcounted); 6538 else if (likely(ipv6_bpf_stub)) 6539 sk = ipv6_bpf_stub->udp6_lib_lookup(net, 6540 src6, tuple->ipv6.sport, 6541 dst6, tuple->ipv6.dport, 6542 dif, sdif, 6543 net->ipv4.udp_table, NULL); 6544 #endif 6545 } 6546 6547 if (unlikely(sk && !refcounted && !sock_flag(sk, SOCK_RCU_FREE))) { 6548 WARN_ONCE(1, "Found non-RCU, unreferenced socket!"); 6549 sk = NULL; 6550 } 6551 return sk; 6552 } 6553 6554 /* bpf_skc_lookup performs the core lookup for different types of sockets, 6555 * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE. 6556 */ 6557 static struct sock * 6558 __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6559 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, 6560 u64 flags, int sdif) 6561 { 6562 struct sock *sk = NULL; 6563 struct net *net; 6564 u8 family; 6565 6566 if (len == sizeof(tuple->ipv4)) 6567 family = AF_INET; 6568 else if (len == sizeof(tuple->ipv6)) 6569 family = AF_INET6; 6570 else 6571 return NULL; 6572 6573 if (unlikely(flags || !((s32)netns_id < 0 || netns_id <= S32_MAX))) 6574 goto out; 6575 6576 if (sdif < 0) { 6577 if (family == AF_INET) 6578 sdif = inet_sdif(skb); 6579 else 6580 sdif = inet6_sdif(skb); 6581 } 6582 6583 if ((s32)netns_id < 0) { 6584 net = caller_net; 6585 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); 6586 } else { 6587 net = get_net_ns_by_id(caller_net, netns_id); 6588 if (unlikely(!net)) 6589 goto out; 6590 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); 6591 put_net(net); 6592 } 6593 6594 out: 6595 return sk; 6596 } 6597 6598 static struct sock * 6599 __bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6600 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, 6601 u64 flags, int sdif) 6602 { 6603 struct sock *sk = __bpf_skc_lookup(skb, tuple, len, caller_net, 6604 ifindex, proto, netns_id, flags, 6605 sdif); 6606 6607 if (sk) { 6608 struct sock *sk2 = sk_to_full_sk(sk); 6609 6610 /* sk_to_full_sk() may return (sk)->rsk_listener, so make sure the original sk 6611 * sock refcnt is decremented to prevent a request_sock leak. 6612 */ 6613 if (!sk_fullsock(sk2)) 6614 sk2 = NULL; 6615 if (sk2 != sk) { 6616 sock_gen_put(sk); 6617 /* Ensure there is no need to bump sk2 refcnt */ 6618 if (unlikely(sk2 && !sock_flag(sk2, SOCK_RCU_FREE))) { 6619 WARN_ONCE(1, "Found non-RCU, unreferenced socket!"); 6620 return NULL; 6621 } 6622 sk = sk2; 6623 } 6624 } 6625 6626 return sk; 6627 } 6628 6629 static struct sock * 6630 bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6631 u8 proto, u64 netns_id, u64 flags) 6632 { 6633 struct net *caller_net; 6634 int ifindex; 6635 6636 if (skb->dev) { 6637 caller_net = dev_net(skb->dev); 6638 ifindex = skb->dev->ifindex; 6639 } else { 6640 caller_net = sock_net(skb->sk); 6641 ifindex = 0; 6642 } 6643 6644 return __bpf_skc_lookup(skb, tuple, len, caller_net, ifindex, proto, 6645 netns_id, flags, -1); 6646 } 6647 6648 static struct sock * 6649 bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6650 u8 proto, u64 netns_id, u64 flags) 6651 { 6652 struct sock *sk = bpf_skc_lookup(skb, tuple, len, proto, netns_id, 6653 flags); 6654 6655 if (sk) { 6656 struct sock *sk2 = sk_to_full_sk(sk); 6657 6658 /* sk_to_full_sk() may return (sk)->rsk_listener, so make sure the original sk 6659 * sock refcnt is decremented to prevent a request_sock leak. 6660 */ 6661 if (!sk_fullsock(sk2)) 6662 sk2 = NULL; 6663 if (sk2 != sk) { 6664 sock_gen_put(sk); 6665 /* Ensure there is no need to bump sk2 refcnt */ 6666 if (unlikely(sk2 && !sock_flag(sk2, SOCK_RCU_FREE))) { 6667 WARN_ONCE(1, "Found non-RCU, unreferenced socket!"); 6668 return NULL; 6669 } 6670 sk = sk2; 6671 } 6672 } 6673 6674 return sk; 6675 } 6676 6677 BPF_CALL_5(bpf_skc_lookup_tcp, struct sk_buff *, skb, 6678 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6679 { 6680 return (unsigned long)bpf_skc_lookup(skb, tuple, len, IPPROTO_TCP, 6681 netns_id, flags); 6682 } 6683 6684 static const struct bpf_func_proto bpf_skc_lookup_tcp_proto = { 6685 .func = bpf_skc_lookup_tcp, 6686 .gpl_only = false, 6687 .pkt_access = true, 6688 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 6689 .arg1_type = ARG_PTR_TO_CTX, 6690 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6691 .arg3_type = ARG_CONST_SIZE, 6692 .arg4_type = ARG_ANYTHING, 6693 .arg5_type = ARG_ANYTHING, 6694 }; 6695 6696 BPF_CALL_5(bpf_sk_lookup_tcp, struct sk_buff *, skb, 6697 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6698 { 6699 return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP, 6700 netns_id, flags); 6701 } 6702 6703 static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = { 6704 .func = bpf_sk_lookup_tcp, 6705 .gpl_only = false, 6706 .pkt_access = true, 6707 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6708 .arg1_type = ARG_PTR_TO_CTX, 6709 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6710 .arg3_type = ARG_CONST_SIZE, 6711 .arg4_type = ARG_ANYTHING, 6712 .arg5_type = ARG_ANYTHING, 6713 }; 6714 6715 BPF_CALL_5(bpf_sk_lookup_udp, struct sk_buff *, skb, 6716 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6717 { 6718 return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP, 6719 netns_id, flags); 6720 } 6721 6722 static const struct bpf_func_proto bpf_sk_lookup_udp_proto = { 6723 .func = bpf_sk_lookup_udp, 6724 .gpl_only = false, 6725 .pkt_access = true, 6726 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6727 .arg1_type = ARG_PTR_TO_CTX, 6728 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6729 .arg3_type = ARG_CONST_SIZE, 6730 .arg4_type = ARG_ANYTHING, 6731 .arg5_type = ARG_ANYTHING, 6732 }; 6733 6734 BPF_CALL_5(bpf_tc_skc_lookup_tcp, struct sk_buff *, skb, 6735 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6736 { 6737 struct net_device *dev = skb->dev; 6738 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6739 struct net *caller_net = dev_net(dev); 6740 6741 return (unsigned long)__bpf_skc_lookup(skb, tuple, len, caller_net, 6742 ifindex, IPPROTO_TCP, netns_id, 6743 flags, sdif); 6744 } 6745 6746 static const struct bpf_func_proto bpf_tc_skc_lookup_tcp_proto = { 6747 .func = bpf_tc_skc_lookup_tcp, 6748 .gpl_only = false, 6749 .pkt_access = true, 6750 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 6751 .arg1_type = ARG_PTR_TO_CTX, 6752 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6753 .arg3_type = ARG_CONST_SIZE, 6754 .arg4_type = ARG_ANYTHING, 6755 .arg5_type = ARG_ANYTHING, 6756 }; 6757 6758 BPF_CALL_5(bpf_tc_sk_lookup_tcp, struct sk_buff *, skb, 6759 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6760 { 6761 struct net_device *dev = skb->dev; 6762 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6763 struct net *caller_net = dev_net(dev); 6764 6765 return (unsigned long)__bpf_sk_lookup(skb, tuple, len, caller_net, 6766 ifindex, IPPROTO_TCP, netns_id, 6767 flags, sdif); 6768 } 6769 6770 static const struct bpf_func_proto bpf_tc_sk_lookup_tcp_proto = { 6771 .func = bpf_tc_sk_lookup_tcp, 6772 .gpl_only = false, 6773 .pkt_access = true, 6774 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6775 .arg1_type = ARG_PTR_TO_CTX, 6776 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6777 .arg3_type = ARG_CONST_SIZE, 6778 .arg4_type = ARG_ANYTHING, 6779 .arg5_type = ARG_ANYTHING, 6780 }; 6781 6782 BPF_CALL_5(bpf_tc_sk_lookup_udp, struct sk_buff *, skb, 6783 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6784 { 6785 struct net_device *dev = skb->dev; 6786 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6787 struct net *caller_net = dev_net(dev); 6788 6789 return (unsigned long)__bpf_sk_lookup(skb, tuple, len, caller_net, 6790 ifindex, IPPROTO_UDP, netns_id, 6791 flags, sdif); 6792 } 6793 6794 static const struct bpf_func_proto bpf_tc_sk_lookup_udp_proto = { 6795 .func = bpf_tc_sk_lookup_udp, 6796 .gpl_only = false, 6797 .pkt_access = true, 6798 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6799 .arg1_type = ARG_PTR_TO_CTX, 6800 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6801 .arg3_type = ARG_CONST_SIZE, 6802 .arg4_type = ARG_ANYTHING, 6803 .arg5_type = ARG_ANYTHING, 6804 }; 6805 6806 BPF_CALL_1(bpf_sk_release, struct sock *, sk) 6807 { 6808 if (sk && sk_is_refcounted(sk)) 6809 sock_gen_put(sk); 6810 return 0; 6811 } 6812 6813 static const struct bpf_func_proto bpf_sk_release_proto = { 6814 .func = bpf_sk_release, 6815 .gpl_only = false, 6816 .ret_type = RET_INTEGER, 6817 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON | OBJ_RELEASE, 6818 }; 6819 6820 BPF_CALL_5(bpf_xdp_sk_lookup_udp, struct xdp_buff *, ctx, 6821 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 6822 { 6823 struct net_device *dev = ctx->rxq->dev; 6824 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6825 struct net *caller_net = dev_net(dev); 6826 6827 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, 6828 ifindex, IPPROTO_UDP, netns_id, 6829 flags, sdif); 6830 } 6831 6832 static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = { 6833 .func = bpf_xdp_sk_lookup_udp, 6834 .gpl_only = false, 6835 .pkt_access = true, 6836 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6837 .arg1_type = ARG_PTR_TO_CTX, 6838 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6839 .arg3_type = ARG_CONST_SIZE, 6840 .arg4_type = ARG_ANYTHING, 6841 .arg5_type = ARG_ANYTHING, 6842 }; 6843 6844 BPF_CALL_5(bpf_xdp_skc_lookup_tcp, struct xdp_buff *, ctx, 6845 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 6846 { 6847 struct net_device *dev = ctx->rxq->dev; 6848 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6849 struct net *caller_net = dev_net(dev); 6850 6851 return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, caller_net, 6852 ifindex, IPPROTO_TCP, netns_id, 6853 flags, sdif); 6854 } 6855 6856 static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto = { 6857 .func = bpf_xdp_skc_lookup_tcp, 6858 .gpl_only = false, 6859 .pkt_access = true, 6860 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 6861 .arg1_type = ARG_PTR_TO_CTX, 6862 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6863 .arg3_type = ARG_CONST_SIZE, 6864 .arg4_type = ARG_ANYTHING, 6865 .arg5_type = ARG_ANYTHING, 6866 }; 6867 6868 BPF_CALL_5(bpf_xdp_sk_lookup_tcp, struct xdp_buff *, ctx, 6869 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 6870 { 6871 struct net_device *dev = ctx->rxq->dev; 6872 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6873 struct net *caller_net = dev_net(dev); 6874 6875 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, 6876 ifindex, IPPROTO_TCP, netns_id, 6877 flags, sdif); 6878 } 6879 6880 static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = { 6881 .func = bpf_xdp_sk_lookup_tcp, 6882 .gpl_only = false, 6883 .pkt_access = true, 6884 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6885 .arg1_type = ARG_PTR_TO_CTX, 6886 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6887 .arg3_type = ARG_CONST_SIZE, 6888 .arg4_type = ARG_ANYTHING, 6889 .arg5_type = ARG_ANYTHING, 6890 }; 6891 6892 BPF_CALL_5(bpf_sock_addr_skc_lookup_tcp, struct bpf_sock_addr_kern *, ctx, 6893 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6894 { 6895 return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, 6896 sock_net(ctx->sk), 0, 6897 IPPROTO_TCP, netns_id, flags, 6898 -1); 6899 } 6900 6901 static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto = { 6902 .func = bpf_sock_addr_skc_lookup_tcp, 6903 .gpl_only = false, 6904 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 6905 .arg1_type = ARG_PTR_TO_CTX, 6906 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6907 .arg3_type = ARG_CONST_SIZE, 6908 .arg4_type = ARG_ANYTHING, 6909 .arg5_type = ARG_ANYTHING, 6910 }; 6911 6912 BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp, struct bpf_sock_addr_kern *, ctx, 6913 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6914 { 6915 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, 6916 sock_net(ctx->sk), 0, IPPROTO_TCP, 6917 netns_id, flags, -1); 6918 } 6919 6920 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = { 6921 .func = bpf_sock_addr_sk_lookup_tcp, 6922 .gpl_only = false, 6923 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6924 .arg1_type = ARG_PTR_TO_CTX, 6925 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6926 .arg3_type = ARG_CONST_SIZE, 6927 .arg4_type = ARG_ANYTHING, 6928 .arg5_type = ARG_ANYTHING, 6929 }; 6930 6931 BPF_CALL_5(bpf_sock_addr_sk_lookup_udp, struct bpf_sock_addr_kern *, ctx, 6932 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6933 { 6934 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, 6935 sock_net(ctx->sk), 0, IPPROTO_UDP, 6936 netns_id, flags, -1); 6937 } 6938 6939 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = { 6940 .func = bpf_sock_addr_sk_lookup_udp, 6941 .gpl_only = false, 6942 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6943 .arg1_type = ARG_PTR_TO_CTX, 6944 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6945 .arg3_type = ARG_CONST_SIZE, 6946 .arg4_type = ARG_ANYTHING, 6947 .arg5_type = ARG_ANYTHING, 6948 }; 6949 6950 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 6951 struct bpf_insn_access_aux *info) 6952 { 6953 if (off < 0 || off >= offsetofend(struct bpf_tcp_sock, 6954 icsk_retransmits)) 6955 return false; 6956 6957 if (off % size != 0) 6958 return false; 6959 6960 switch (off) { 6961 case offsetof(struct bpf_tcp_sock, bytes_received): 6962 case offsetof(struct bpf_tcp_sock, bytes_acked): 6963 return size == sizeof(__u64); 6964 default: 6965 return size == sizeof(__u32); 6966 } 6967 } 6968 6969 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 6970 const struct bpf_insn *si, 6971 struct bpf_insn *insn_buf, 6972 struct bpf_prog *prog, u32 *target_size) 6973 { 6974 struct bpf_insn *insn = insn_buf; 6975 6976 #define BPF_TCP_SOCK_GET_COMMON(FIELD) \ 6977 do { \ 6978 BUILD_BUG_ON(sizeof_field(struct tcp_sock, FIELD) > \ 6979 sizeof_field(struct bpf_tcp_sock, FIELD)); \ 6980 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_sock, FIELD),\ 6981 si->dst_reg, si->src_reg, \ 6982 offsetof(struct tcp_sock, FIELD)); \ 6983 } while (0) 6984 6985 #define BPF_INET_SOCK_GET_COMMON(FIELD) \ 6986 do { \ 6987 BUILD_BUG_ON(sizeof_field(struct inet_connection_sock, \ 6988 FIELD) > \ 6989 sizeof_field(struct bpf_tcp_sock, FIELD)); \ 6990 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 6991 struct inet_connection_sock, \ 6992 FIELD), \ 6993 si->dst_reg, si->src_reg, \ 6994 offsetof( \ 6995 struct inet_connection_sock, \ 6996 FIELD)); \ 6997 } while (0) 6998 6999 BTF_TYPE_EMIT(struct bpf_tcp_sock); 7000 7001 switch (si->off) { 7002 case offsetof(struct bpf_tcp_sock, rtt_min): 7003 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) != 7004 sizeof(struct minmax)); 7005 BUILD_BUG_ON(sizeof(struct minmax) < 7006 sizeof(struct minmax_sample)); 7007 7008 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7009 offsetof(struct tcp_sock, rtt_min) + 7010 offsetof(struct minmax_sample, v)); 7011 break; 7012 case offsetof(struct bpf_tcp_sock, snd_cwnd): 7013 BPF_TCP_SOCK_GET_COMMON(snd_cwnd); 7014 break; 7015 case offsetof(struct bpf_tcp_sock, srtt_us): 7016 BPF_TCP_SOCK_GET_COMMON(srtt_us); 7017 break; 7018 case offsetof(struct bpf_tcp_sock, snd_ssthresh): 7019 BPF_TCP_SOCK_GET_COMMON(snd_ssthresh); 7020 break; 7021 case offsetof(struct bpf_tcp_sock, rcv_nxt): 7022 BPF_TCP_SOCK_GET_COMMON(rcv_nxt); 7023 break; 7024 case offsetof(struct bpf_tcp_sock, snd_nxt): 7025 BPF_TCP_SOCK_GET_COMMON(snd_nxt); 7026 break; 7027 case offsetof(struct bpf_tcp_sock, snd_una): 7028 BPF_TCP_SOCK_GET_COMMON(snd_una); 7029 break; 7030 case offsetof(struct bpf_tcp_sock, mss_cache): 7031 BPF_TCP_SOCK_GET_COMMON(mss_cache); 7032 break; 7033 case offsetof(struct bpf_tcp_sock, ecn_flags): 7034 BPF_TCP_SOCK_GET_COMMON(ecn_flags); 7035 break; 7036 case offsetof(struct bpf_tcp_sock, rate_delivered): 7037 BPF_TCP_SOCK_GET_COMMON(rate_delivered); 7038 break; 7039 case offsetof(struct bpf_tcp_sock, rate_interval_us): 7040 BPF_TCP_SOCK_GET_COMMON(rate_interval_us); 7041 break; 7042 case offsetof(struct bpf_tcp_sock, packets_out): 7043 BPF_TCP_SOCK_GET_COMMON(packets_out); 7044 break; 7045 case offsetof(struct bpf_tcp_sock, retrans_out): 7046 BPF_TCP_SOCK_GET_COMMON(retrans_out); 7047 break; 7048 case offsetof(struct bpf_tcp_sock, total_retrans): 7049 BPF_TCP_SOCK_GET_COMMON(total_retrans); 7050 break; 7051 case offsetof(struct bpf_tcp_sock, segs_in): 7052 BPF_TCP_SOCK_GET_COMMON(segs_in); 7053 break; 7054 case offsetof(struct bpf_tcp_sock, data_segs_in): 7055 BPF_TCP_SOCK_GET_COMMON(data_segs_in); 7056 break; 7057 case offsetof(struct bpf_tcp_sock, segs_out): 7058 BPF_TCP_SOCK_GET_COMMON(segs_out); 7059 break; 7060 case offsetof(struct bpf_tcp_sock, data_segs_out): 7061 BPF_TCP_SOCK_GET_COMMON(data_segs_out); 7062 break; 7063 case offsetof(struct bpf_tcp_sock, lost_out): 7064 BPF_TCP_SOCK_GET_COMMON(lost_out); 7065 break; 7066 case offsetof(struct bpf_tcp_sock, sacked_out): 7067 BPF_TCP_SOCK_GET_COMMON(sacked_out); 7068 break; 7069 case offsetof(struct bpf_tcp_sock, bytes_received): 7070 BPF_TCP_SOCK_GET_COMMON(bytes_received); 7071 break; 7072 case offsetof(struct bpf_tcp_sock, bytes_acked): 7073 BPF_TCP_SOCK_GET_COMMON(bytes_acked); 7074 break; 7075 case offsetof(struct bpf_tcp_sock, dsack_dups): 7076 BPF_TCP_SOCK_GET_COMMON(dsack_dups); 7077 break; 7078 case offsetof(struct bpf_tcp_sock, delivered): 7079 BPF_TCP_SOCK_GET_COMMON(delivered); 7080 break; 7081 case offsetof(struct bpf_tcp_sock, delivered_ce): 7082 BPF_TCP_SOCK_GET_COMMON(delivered_ce); 7083 break; 7084 case offsetof(struct bpf_tcp_sock, icsk_retransmits): 7085 BPF_INET_SOCK_GET_COMMON(icsk_retransmits); 7086 break; 7087 } 7088 7089 return insn - insn_buf; 7090 } 7091 7092 BPF_CALL_1(bpf_tcp_sock, struct sock *, sk) 7093 { 7094 if (sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP) 7095 return (unsigned long)sk; 7096 7097 return (unsigned long)NULL; 7098 } 7099 7100 const struct bpf_func_proto bpf_tcp_sock_proto = { 7101 .func = bpf_tcp_sock, 7102 .gpl_only = false, 7103 .ret_type = RET_PTR_TO_TCP_SOCK_OR_NULL, 7104 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 7105 }; 7106 7107 BPF_CALL_1(bpf_get_listener_sock, struct sock *, sk) 7108 { 7109 sk = sk_to_full_sk(sk); 7110 7111 if (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_RCU_FREE)) 7112 return (unsigned long)sk; 7113 7114 return (unsigned long)NULL; 7115 } 7116 7117 static const struct bpf_func_proto bpf_get_listener_sock_proto = { 7118 .func = bpf_get_listener_sock, 7119 .gpl_only = false, 7120 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 7121 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 7122 }; 7123 7124 BPF_CALL_1(bpf_skb_ecn_set_ce, struct sk_buff *, skb) 7125 { 7126 unsigned int iphdr_len; 7127 7128 switch (skb_protocol(skb, true)) { 7129 case cpu_to_be16(ETH_P_IP): 7130 iphdr_len = sizeof(struct iphdr); 7131 break; 7132 case cpu_to_be16(ETH_P_IPV6): 7133 iphdr_len = sizeof(struct ipv6hdr); 7134 break; 7135 default: 7136 return 0; 7137 } 7138 7139 if (skb_headlen(skb) < iphdr_len) 7140 return 0; 7141 7142 if (skb_cloned(skb) && !skb_clone_writable(skb, iphdr_len)) 7143 return 0; 7144 7145 return INET_ECN_set_ce(skb); 7146 } 7147 7148 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 7149 struct bpf_insn_access_aux *info) 7150 { 7151 if (off < 0 || off >= offsetofend(struct bpf_xdp_sock, queue_id)) 7152 return false; 7153 7154 if (off % size != 0) 7155 return false; 7156 7157 switch (off) { 7158 default: 7159 return size == sizeof(__u32); 7160 } 7161 } 7162 7163 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 7164 const struct bpf_insn *si, 7165 struct bpf_insn *insn_buf, 7166 struct bpf_prog *prog, u32 *target_size) 7167 { 7168 struct bpf_insn *insn = insn_buf; 7169 7170 #define BPF_XDP_SOCK_GET(FIELD) \ 7171 do { \ 7172 BUILD_BUG_ON(sizeof_field(struct xdp_sock, FIELD) > \ 7173 sizeof_field(struct bpf_xdp_sock, FIELD)); \ 7174 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_sock, FIELD),\ 7175 si->dst_reg, si->src_reg, \ 7176 offsetof(struct xdp_sock, FIELD)); \ 7177 } while (0) 7178 7179 switch (si->off) { 7180 case offsetof(struct bpf_xdp_sock, queue_id): 7181 BPF_XDP_SOCK_GET(queue_id); 7182 break; 7183 } 7184 7185 return insn - insn_buf; 7186 } 7187 7188 static const struct bpf_func_proto bpf_skb_ecn_set_ce_proto = { 7189 .func = bpf_skb_ecn_set_ce, 7190 .gpl_only = false, 7191 .ret_type = RET_INTEGER, 7192 .arg1_type = ARG_PTR_TO_CTX, 7193 }; 7194 7195 BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len, 7196 struct tcphdr *, th, u32, th_len) 7197 { 7198 #ifdef CONFIG_SYN_COOKIES 7199 u32 cookie; 7200 int ret; 7201 7202 if (unlikely(!sk || th_len < sizeof(*th))) 7203 return -EINVAL; 7204 7205 /* sk_listener() allows TCP_NEW_SYN_RECV, which makes no sense here. */ 7206 if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN) 7207 return -EINVAL; 7208 7209 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_syncookies)) 7210 return -EINVAL; 7211 7212 if (!th->ack || th->rst || th->syn) 7213 return -ENOENT; 7214 7215 if (unlikely(iph_len < sizeof(struct iphdr))) 7216 return -EINVAL; 7217 7218 if (tcp_synq_no_recent_overflow(sk)) 7219 return -ENOENT; 7220 7221 cookie = ntohl(th->ack_seq) - 1; 7222 7223 /* Both struct iphdr and struct ipv6hdr have the version field at the 7224 * same offset so we can cast to the shorter header (struct iphdr). 7225 */ 7226 switch (((struct iphdr *)iph)->version) { 7227 case 4: 7228 if (sk->sk_family == AF_INET6 && ipv6_only_sock(sk)) 7229 return -EINVAL; 7230 7231 ret = __cookie_v4_check((struct iphdr *)iph, th, cookie); 7232 break; 7233 7234 #if IS_BUILTIN(CONFIG_IPV6) 7235 case 6: 7236 if (unlikely(iph_len < sizeof(struct ipv6hdr))) 7237 return -EINVAL; 7238 7239 if (sk->sk_family != AF_INET6) 7240 return -EINVAL; 7241 7242 ret = __cookie_v6_check((struct ipv6hdr *)iph, th, cookie); 7243 break; 7244 #endif /* CONFIG_IPV6 */ 7245 7246 default: 7247 return -EPROTONOSUPPORT; 7248 } 7249 7250 if (ret > 0) 7251 return 0; 7252 7253 return -ENOENT; 7254 #else 7255 return -ENOTSUPP; 7256 #endif 7257 } 7258 7259 static const struct bpf_func_proto bpf_tcp_check_syncookie_proto = { 7260 .func = bpf_tcp_check_syncookie, 7261 .gpl_only = true, 7262 .pkt_access = true, 7263 .ret_type = RET_INTEGER, 7264 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 7265 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7266 .arg3_type = ARG_CONST_SIZE, 7267 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7268 .arg5_type = ARG_CONST_SIZE, 7269 }; 7270 7271 BPF_CALL_5(bpf_tcp_gen_syncookie, struct sock *, sk, void *, iph, u32, iph_len, 7272 struct tcphdr *, th, u32, th_len) 7273 { 7274 #ifdef CONFIG_SYN_COOKIES 7275 u32 cookie; 7276 u16 mss; 7277 7278 if (unlikely(!sk || th_len < sizeof(*th) || th_len != th->doff * 4)) 7279 return -EINVAL; 7280 7281 if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN) 7282 return -EINVAL; 7283 7284 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_syncookies)) 7285 return -ENOENT; 7286 7287 if (!th->syn || th->ack || th->fin || th->rst) 7288 return -EINVAL; 7289 7290 if (unlikely(iph_len < sizeof(struct iphdr))) 7291 return -EINVAL; 7292 7293 /* Both struct iphdr and struct ipv6hdr have the version field at the 7294 * same offset so we can cast to the shorter header (struct iphdr). 7295 */ 7296 switch (((struct iphdr *)iph)->version) { 7297 case 4: 7298 if (sk->sk_family == AF_INET6 && ipv6_only_sock(sk)) 7299 return -EINVAL; 7300 7301 mss = tcp_v4_get_syncookie(sk, iph, th, &cookie); 7302 break; 7303 7304 #if IS_BUILTIN(CONFIG_IPV6) 7305 case 6: 7306 if (unlikely(iph_len < sizeof(struct ipv6hdr))) 7307 return -EINVAL; 7308 7309 if (sk->sk_family != AF_INET6) 7310 return -EINVAL; 7311 7312 mss = tcp_v6_get_syncookie(sk, iph, th, &cookie); 7313 break; 7314 #endif /* CONFIG_IPV6 */ 7315 7316 default: 7317 return -EPROTONOSUPPORT; 7318 } 7319 if (mss == 0) 7320 return -ENOENT; 7321 7322 return cookie | ((u64)mss << 32); 7323 #else 7324 return -EOPNOTSUPP; 7325 #endif /* CONFIG_SYN_COOKIES */ 7326 } 7327 7328 static const struct bpf_func_proto bpf_tcp_gen_syncookie_proto = { 7329 .func = bpf_tcp_gen_syncookie, 7330 .gpl_only = true, /* __cookie_v*_init_sequence() is GPL */ 7331 .pkt_access = true, 7332 .ret_type = RET_INTEGER, 7333 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 7334 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7335 .arg3_type = ARG_CONST_SIZE, 7336 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7337 .arg5_type = ARG_CONST_SIZE, 7338 }; 7339 7340 BPF_CALL_3(bpf_sk_assign, struct sk_buff *, skb, struct sock *, sk, u64, flags) 7341 { 7342 if (!sk || flags != 0) 7343 return -EINVAL; 7344 if (!skb_at_tc_ingress(skb)) 7345 return -EOPNOTSUPP; 7346 if (unlikely(dev_net(skb->dev) != sock_net(sk))) 7347 return -ENETUNREACH; 7348 if (sk_unhashed(sk)) 7349 return -EOPNOTSUPP; 7350 if (sk_is_refcounted(sk) && 7351 unlikely(!refcount_inc_not_zero(&sk->sk_refcnt))) 7352 return -ENOENT; 7353 7354 skb_orphan(skb); 7355 skb->sk = sk; 7356 skb->destructor = sock_pfree; 7357 7358 return 0; 7359 } 7360 7361 static const struct bpf_func_proto bpf_sk_assign_proto = { 7362 .func = bpf_sk_assign, 7363 .gpl_only = false, 7364 .ret_type = RET_INTEGER, 7365 .arg1_type = ARG_PTR_TO_CTX, 7366 .arg2_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 7367 .arg3_type = ARG_ANYTHING, 7368 }; 7369 7370 static const u8 *bpf_search_tcp_opt(const u8 *op, const u8 *opend, 7371 u8 search_kind, const u8 *magic, 7372 u8 magic_len, bool *eol) 7373 { 7374 u8 kind, kind_len; 7375 7376 *eol = false; 7377 7378 while (op < opend) { 7379 kind = op[0]; 7380 7381 if (kind == TCPOPT_EOL) { 7382 *eol = true; 7383 return ERR_PTR(-ENOMSG); 7384 } else if (kind == TCPOPT_NOP) { 7385 op++; 7386 continue; 7387 } 7388 7389 if (opend - op < 2 || opend - op < op[1] || op[1] < 2) 7390 /* Something is wrong in the received header. 7391 * Follow the TCP stack's tcp_parse_options() 7392 * and just bail here. 7393 */ 7394 return ERR_PTR(-EFAULT); 7395 7396 kind_len = op[1]; 7397 if (search_kind == kind) { 7398 if (!magic_len) 7399 return op; 7400 7401 if (magic_len > kind_len - 2) 7402 return ERR_PTR(-ENOMSG); 7403 7404 if (!memcmp(&op[2], magic, magic_len)) 7405 return op; 7406 } 7407 7408 op += kind_len; 7409 } 7410 7411 return ERR_PTR(-ENOMSG); 7412 } 7413 7414 BPF_CALL_4(bpf_sock_ops_load_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock, 7415 void *, search_res, u32, len, u64, flags) 7416 { 7417 bool eol, load_syn = flags & BPF_LOAD_HDR_OPT_TCP_SYN; 7418 const u8 *op, *opend, *magic, *search = search_res; 7419 u8 search_kind, search_len, copy_len, magic_len; 7420 int ret; 7421 7422 /* 2 byte is the minimal option len except TCPOPT_NOP and 7423 * TCPOPT_EOL which are useless for the bpf prog to learn 7424 * and this helper disallow loading them also. 7425 */ 7426 if (len < 2 || flags & ~BPF_LOAD_HDR_OPT_TCP_SYN) 7427 return -EINVAL; 7428 7429 search_kind = search[0]; 7430 search_len = search[1]; 7431 7432 if (search_len > len || search_kind == TCPOPT_NOP || 7433 search_kind == TCPOPT_EOL) 7434 return -EINVAL; 7435 7436 if (search_kind == TCPOPT_EXP || search_kind == 253) { 7437 /* 16 or 32 bit magic. +2 for kind and kind length */ 7438 if (search_len != 4 && search_len != 6) 7439 return -EINVAL; 7440 magic = &search[2]; 7441 magic_len = search_len - 2; 7442 } else { 7443 if (search_len) 7444 return -EINVAL; 7445 magic = NULL; 7446 magic_len = 0; 7447 } 7448 7449 if (load_syn) { 7450 ret = bpf_sock_ops_get_syn(bpf_sock, TCP_BPF_SYN, &op); 7451 if (ret < 0) 7452 return ret; 7453 7454 opend = op + ret; 7455 op += sizeof(struct tcphdr); 7456 } else { 7457 if (!bpf_sock->skb || 7458 bpf_sock->op == BPF_SOCK_OPS_HDR_OPT_LEN_CB) 7459 /* This bpf_sock->op cannot call this helper */ 7460 return -EPERM; 7461 7462 opend = bpf_sock->skb_data_end; 7463 op = bpf_sock->skb->data + sizeof(struct tcphdr); 7464 } 7465 7466 op = bpf_search_tcp_opt(op, opend, search_kind, magic, magic_len, 7467 &eol); 7468 if (IS_ERR(op)) 7469 return PTR_ERR(op); 7470 7471 copy_len = op[1]; 7472 ret = copy_len; 7473 if (copy_len > len) { 7474 ret = -ENOSPC; 7475 copy_len = len; 7476 } 7477 7478 memcpy(search_res, op, copy_len); 7479 return ret; 7480 } 7481 7482 static const struct bpf_func_proto bpf_sock_ops_load_hdr_opt_proto = { 7483 .func = bpf_sock_ops_load_hdr_opt, 7484 .gpl_only = false, 7485 .ret_type = RET_INTEGER, 7486 .arg1_type = ARG_PTR_TO_CTX, 7487 .arg2_type = ARG_PTR_TO_MEM, 7488 .arg3_type = ARG_CONST_SIZE, 7489 .arg4_type = ARG_ANYTHING, 7490 }; 7491 7492 BPF_CALL_4(bpf_sock_ops_store_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock, 7493 const void *, from, u32, len, u64, flags) 7494 { 7495 u8 new_kind, new_kind_len, magic_len = 0, *opend; 7496 const u8 *op, *new_op, *magic = NULL; 7497 struct sk_buff *skb; 7498 bool eol; 7499 7500 if (bpf_sock->op != BPF_SOCK_OPS_WRITE_HDR_OPT_CB) 7501 return -EPERM; 7502 7503 if (len < 2 || flags) 7504 return -EINVAL; 7505 7506 new_op = from; 7507 new_kind = new_op[0]; 7508 new_kind_len = new_op[1]; 7509 7510 if (new_kind_len > len || new_kind == TCPOPT_NOP || 7511 new_kind == TCPOPT_EOL) 7512 return -EINVAL; 7513 7514 if (new_kind_len > bpf_sock->remaining_opt_len) 7515 return -ENOSPC; 7516 7517 /* 253 is another experimental kind */ 7518 if (new_kind == TCPOPT_EXP || new_kind == 253) { 7519 if (new_kind_len < 4) 7520 return -EINVAL; 7521 /* Match for the 2 byte magic also. 7522 * RFC 6994: the magic could be 2 or 4 bytes. 7523 * Hence, matching by 2 byte only is on the 7524 * conservative side but it is the right 7525 * thing to do for the 'search-for-duplication' 7526 * purpose. 7527 */ 7528 magic = &new_op[2]; 7529 magic_len = 2; 7530 } 7531 7532 /* Check for duplication */ 7533 skb = bpf_sock->skb; 7534 op = skb->data + sizeof(struct tcphdr); 7535 opend = bpf_sock->skb_data_end; 7536 7537 op = bpf_search_tcp_opt(op, opend, new_kind, magic, magic_len, 7538 &eol); 7539 if (!IS_ERR(op)) 7540 return -EEXIST; 7541 7542 if (PTR_ERR(op) != -ENOMSG) 7543 return PTR_ERR(op); 7544 7545 if (eol) 7546 /* The option has been ended. Treat it as no more 7547 * header option can be written. 7548 */ 7549 return -ENOSPC; 7550 7551 /* No duplication found. Store the header option. */ 7552 memcpy(opend, from, new_kind_len); 7553 7554 bpf_sock->remaining_opt_len -= new_kind_len; 7555 bpf_sock->skb_data_end += new_kind_len; 7556 7557 return 0; 7558 } 7559 7560 static const struct bpf_func_proto bpf_sock_ops_store_hdr_opt_proto = { 7561 .func = bpf_sock_ops_store_hdr_opt, 7562 .gpl_only = false, 7563 .ret_type = RET_INTEGER, 7564 .arg1_type = ARG_PTR_TO_CTX, 7565 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7566 .arg3_type = ARG_CONST_SIZE, 7567 .arg4_type = ARG_ANYTHING, 7568 }; 7569 7570 BPF_CALL_3(bpf_sock_ops_reserve_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock, 7571 u32, len, u64, flags) 7572 { 7573 if (bpf_sock->op != BPF_SOCK_OPS_HDR_OPT_LEN_CB) 7574 return -EPERM; 7575 7576 if (flags || len < 2) 7577 return -EINVAL; 7578 7579 if (len > bpf_sock->remaining_opt_len) 7580 return -ENOSPC; 7581 7582 bpf_sock->remaining_opt_len -= len; 7583 7584 return 0; 7585 } 7586 7587 static const struct bpf_func_proto bpf_sock_ops_reserve_hdr_opt_proto = { 7588 .func = bpf_sock_ops_reserve_hdr_opt, 7589 .gpl_only = false, 7590 .ret_type = RET_INTEGER, 7591 .arg1_type = ARG_PTR_TO_CTX, 7592 .arg2_type = ARG_ANYTHING, 7593 .arg3_type = ARG_ANYTHING, 7594 }; 7595 7596 BPF_CALL_3(bpf_skb_set_tstamp, struct sk_buff *, skb, 7597 u64, tstamp, u32, tstamp_type) 7598 { 7599 /* skb_clear_delivery_time() is done for inet protocol */ 7600 if (skb->protocol != htons(ETH_P_IP) && 7601 skb->protocol != htons(ETH_P_IPV6)) 7602 return -EOPNOTSUPP; 7603 7604 switch (tstamp_type) { 7605 case BPF_SKB_TSTAMP_DELIVERY_MONO: 7606 if (!tstamp) 7607 return -EINVAL; 7608 skb->tstamp = tstamp; 7609 skb->mono_delivery_time = 1; 7610 break; 7611 case BPF_SKB_TSTAMP_UNSPEC: 7612 if (tstamp) 7613 return -EINVAL; 7614 skb->tstamp = 0; 7615 skb->mono_delivery_time = 0; 7616 break; 7617 default: 7618 return -EINVAL; 7619 } 7620 7621 return 0; 7622 } 7623 7624 static const struct bpf_func_proto bpf_skb_set_tstamp_proto = { 7625 .func = bpf_skb_set_tstamp, 7626 .gpl_only = false, 7627 .ret_type = RET_INTEGER, 7628 .arg1_type = ARG_PTR_TO_CTX, 7629 .arg2_type = ARG_ANYTHING, 7630 .arg3_type = ARG_ANYTHING, 7631 }; 7632 7633 #ifdef CONFIG_SYN_COOKIES 7634 BPF_CALL_3(bpf_tcp_raw_gen_syncookie_ipv4, struct iphdr *, iph, 7635 struct tcphdr *, th, u32, th_len) 7636 { 7637 u32 cookie; 7638 u16 mss; 7639 7640 if (unlikely(th_len < sizeof(*th) || th_len != th->doff * 4)) 7641 return -EINVAL; 7642 7643 mss = tcp_parse_mss_option(th, 0) ?: TCP_MSS_DEFAULT; 7644 cookie = __cookie_v4_init_sequence(iph, th, &mss); 7645 7646 return cookie | ((u64)mss << 32); 7647 } 7648 7649 static const struct bpf_func_proto bpf_tcp_raw_gen_syncookie_ipv4_proto = { 7650 .func = bpf_tcp_raw_gen_syncookie_ipv4, 7651 .gpl_only = true, /* __cookie_v4_init_sequence() is GPL */ 7652 .pkt_access = true, 7653 .ret_type = RET_INTEGER, 7654 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7655 .arg1_size = sizeof(struct iphdr), 7656 .arg2_type = ARG_PTR_TO_MEM, 7657 .arg3_type = ARG_CONST_SIZE_OR_ZERO, 7658 }; 7659 7660 BPF_CALL_3(bpf_tcp_raw_gen_syncookie_ipv6, struct ipv6hdr *, iph, 7661 struct tcphdr *, th, u32, th_len) 7662 { 7663 #if IS_BUILTIN(CONFIG_IPV6) 7664 const u16 mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - 7665 sizeof(struct ipv6hdr); 7666 u32 cookie; 7667 u16 mss; 7668 7669 if (unlikely(th_len < sizeof(*th) || th_len != th->doff * 4)) 7670 return -EINVAL; 7671 7672 mss = tcp_parse_mss_option(th, 0) ?: mss_clamp; 7673 cookie = __cookie_v6_init_sequence(iph, th, &mss); 7674 7675 return cookie | ((u64)mss << 32); 7676 #else 7677 return -EPROTONOSUPPORT; 7678 #endif 7679 } 7680 7681 static const struct bpf_func_proto bpf_tcp_raw_gen_syncookie_ipv6_proto = { 7682 .func = bpf_tcp_raw_gen_syncookie_ipv6, 7683 .gpl_only = true, /* __cookie_v6_init_sequence() is GPL */ 7684 .pkt_access = true, 7685 .ret_type = RET_INTEGER, 7686 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7687 .arg1_size = sizeof(struct ipv6hdr), 7688 .arg2_type = ARG_PTR_TO_MEM, 7689 .arg3_type = ARG_CONST_SIZE_OR_ZERO, 7690 }; 7691 7692 BPF_CALL_2(bpf_tcp_raw_check_syncookie_ipv4, struct iphdr *, iph, 7693 struct tcphdr *, th) 7694 { 7695 u32 cookie = ntohl(th->ack_seq) - 1; 7696 7697 if (__cookie_v4_check(iph, th, cookie) > 0) 7698 return 0; 7699 7700 return -EACCES; 7701 } 7702 7703 static const struct bpf_func_proto bpf_tcp_raw_check_syncookie_ipv4_proto = { 7704 .func = bpf_tcp_raw_check_syncookie_ipv4, 7705 .gpl_only = true, /* __cookie_v4_check is GPL */ 7706 .pkt_access = true, 7707 .ret_type = RET_INTEGER, 7708 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7709 .arg1_size = sizeof(struct iphdr), 7710 .arg2_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7711 .arg2_size = sizeof(struct tcphdr), 7712 }; 7713 7714 BPF_CALL_2(bpf_tcp_raw_check_syncookie_ipv6, struct ipv6hdr *, iph, 7715 struct tcphdr *, th) 7716 { 7717 #if IS_BUILTIN(CONFIG_IPV6) 7718 u32 cookie = ntohl(th->ack_seq) - 1; 7719 7720 if (__cookie_v6_check(iph, th, cookie) > 0) 7721 return 0; 7722 7723 return -EACCES; 7724 #else 7725 return -EPROTONOSUPPORT; 7726 #endif 7727 } 7728 7729 static const struct bpf_func_proto bpf_tcp_raw_check_syncookie_ipv6_proto = { 7730 .func = bpf_tcp_raw_check_syncookie_ipv6, 7731 .gpl_only = true, /* __cookie_v6_check is GPL */ 7732 .pkt_access = true, 7733 .ret_type = RET_INTEGER, 7734 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7735 .arg1_size = sizeof(struct ipv6hdr), 7736 .arg2_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7737 .arg2_size = sizeof(struct tcphdr), 7738 }; 7739 #endif /* CONFIG_SYN_COOKIES */ 7740 7741 #endif /* CONFIG_INET */ 7742 7743 bool bpf_helper_changes_pkt_data(void *func) 7744 { 7745 if (func == bpf_skb_vlan_push || 7746 func == bpf_skb_vlan_pop || 7747 func == bpf_skb_store_bytes || 7748 func == bpf_skb_change_proto || 7749 func == bpf_skb_change_head || 7750 func == sk_skb_change_head || 7751 func == bpf_skb_change_tail || 7752 func == sk_skb_change_tail || 7753 func == bpf_skb_adjust_room || 7754 func == sk_skb_adjust_room || 7755 func == bpf_skb_pull_data || 7756 func == sk_skb_pull_data || 7757 func == bpf_clone_redirect || 7758 func == bpf_l3_csum_replace || 7759 func == bpf_l4_csum_replace || 7760 func == bpf_xdp_adjust_head || 7761 func == bpf_xdp_adjust_meta || 7762 func == bpf_msg_pull_data || 7763 func == bpf_msg_push_data || 7764 func == bpf_msg_pop_data || 7765 func == bpf_xdp_adjust_tail || 7766 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 7767 func == bpf_lwt_seg6_store_bytes || 7768 func == bpf_lwt_seg6_adjust_srh || 7769 func == bpf_lwt_seg6_action || 7770 #endif 7771 #ifdef CONFIG_INET 7772 func == bpf_sock_ops_store_hdr_opt || 7773 #endif 7774 func == bpf_lwt_in_push_encap || 7775 func == bpf_lwt_xmit_push_encap) 7776 return true; 7777 7778 return false; 7779 } 7780 7781 const struct bpf_func_proto bpf_event_output_data_proto __weak; 7782 const struct bpf_func_proto bpf_sk_storage_get_cg_sock_proto __weak; 7783 7784 static const struct bpf_func_proto * 7785 sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7786 { 7787 const struct bpf_func_proto *func_proto; 7788 7789 func_proto = cgroup_common_func_proto(func_id, prog); 7790 if (func_proto) 7791 return func_proto; 7792 7793 func_proto = cgroup_current_func_proto(func_id, prog); 7794 if (func_proto) 7795 return func_proto; 7796 7797 switch (func_id) { 7798 case BPF_FUNC_get_socket_cookie: 7799 return &bpf_get_socket_cookie_sock_proto; 7800 case BPF_FUNC_get_netns_cookie: 7801 return &bpf_get_netns_cookie_sock_proto; 7802 case BPF_FUNC_perf_event_output: 7803 return &bpf_event_output_data_proto; 7804 case BPF_FUNC_sk_storage_get: 7805 return &bpf_sk_storage_get_cg_sock_proto; 7806 case BPF_FUNC_ktime_get_coarse_ns: 7807 return &bpf_ktime_get_coarse_ns_proto; 7808 default: 7809 return bpf_base_func_proto(func_id); 7810 } 7811 } 7812 7813 static const struct bpf_func_proto * 7814 sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7815 { 7816 const struct bpf_func_proto *func_proto; 7817 7818 func_proto = cgroup_common_func_proto(func_id, prog); 7819 if (func_proto) 7820 return func_proto; 7821 7822 func_proto = cgroup_current_func_proto(func_id, prog); 7823 if (func_proto) 7824 return func_proto; 7825 7826 switch (func_id) { 7827 case BPF_FUNC_bind: 7828 switch (prog->expected_attach_type) { 7829 case BPF_CGROUP_INET4_CONNECT: 7830 case BPF_CGROUP_INET6_CONNECT: 7831 return &bpf_bind_proto; 7832 default: 7833 return NULL; 7834 } 7835 case BPF_FUNC_get_socket_cookie: 7836 return &bpf_get_socket_cookie_sock_addr_proto; 7837 case BPF_FUNC_get_netns_cookie: 7838 return &bpf_get_netns_cookie_sock_addr_proto; 7839 case BPF_FUNC_perf_event_output: 7840 return &bpf_event_output_data_proto; 7841 #ifdef CONFIG_INET 7842 case BPF_FUNC_sk_lookup_tcp: 7843 return &bpf_sock_addr_sk_lookup_tcp_proto; 7844 case BPF_FUNC_sk_lookup_udp: 7845 return &bpf_sock_addr_sk_lookup_udp_proto; 7846 case BPF_FUNC_sk_release: 7847 return &bpf_sk_release_proto; 7848 case BPF_FUNC_skc_lookup_tcp: 7849 return &bpf_sock_addr_skc_lookup_tcp_proto; 7850 #endif /* CONFIG_INET */ 7851 case BPF_FUNC_sk_storage_get: 7852 return &bpf_sk_storage_get_proto; 7853 case BPF_FUNC_sk_storage_delete: 7854 return &bpf_sk_storage_delete_proto; 7855 case BPF_FUNC_setsockopt: 7856 switch (prog->expected_attach_type) { 7857 case BPF_CGROUP_INET4_BIND: 7858 case BPF_CGROUP_INET6_BIND: 7859 case BPF_CGROUP_INET4_CONNECT: 7860 case BPF_CGROUP_INET6_CONNECT: 7861 case BPF_CGROUP_UDP4_RECVMSG: 7862 case BPF_CGROUP_UDP6_RECVMSG: 7863 case BPF_CGROUP_UDP4_SENDMSG: 7864 case BPF_CGROUP_UDP6_SENDMSG: 7865 case BPF_CGROUP_INET4_GETPEERNAME: 7866 case BPF_CGROUP_INET6_GETPEERNAME: 7867 case BPF_CGROUP_INET4_GETSOCKNAME: 7868 case BPF_CGROUP_INET6_GETSOCKNAME: 7869 return &bpf_sock_addr_setsockopt_proto; 7870 default: 7871 return NULL; 7872 } 7873 case BPF_FUNC_getsockopt: 7874 switch (prog->expected_attach_type) { 7875 case BPF_CGROUP_INET4_BIND: 7876 case BPF_CGROUP_INET6_BIND: 7877 case BPF_CGROUP_INET4_CONNECT: 7878 case BPF_CGROUP_INET6_CONNECT: 7879 case BPF_CGROUP_UDP4_RECVMSG: 7880 case BPF_CGROUP_UDP6_RECVMSG: 7881 case BPF_CGROUP_UDP4_SENDMSG: 7882 case BPF_CGROUP_UDP6_SENDMSG: 7883 case BPF_CGROUP_INET4_GETPEERNAME: 7884 case BPF_CGROUP_INET6_GETPEERNAME: 7885 case BPF_CGROUP_INET4_GETSOCKNAME: 7886 case BPF_CGROUP_INET6_GETSOCKNAME: 7887 return &bpf_sock_addr_getsockopt_proto; 7888 default: 7889 return NULL; 7890 } 7891 default: 7892 return bpf_sk_base_func_proto(func_id); 7893 } 7894 } 7895 7896 static const struct bpf_func_proto * 7897 sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7898 { 7899 switch (func_id) { 7900 case BPF_FUNC_skb_load_bytes: 7901 return &bpf_skb_load_bytes_proto; 7902 case BPF_FUNC_skb_load_bytes_relative: 7903 return &bpf_skb_load_bytes_relative_proto; 7904 case BPF_FUNC_get_socket_cookie: 7905 return &bpf_get_socket_cookie_proto; 7906 case BPF_FUNC_get_socket_uid: 7907 return &bpf_get_socket_uid_proto; 7908 case BPF_FUNC_perf_event_output: 7909 return &bpf_skb_event_output_proto; 7910 default: 7911 return bpf_sk_base_func_proto(func_id); 7912 } 7913 } 7914 7915 const struct bpf_func_proto bpf_sk_storage_get_proto __weak; 7916 const struct bpf_func_proto bpf_sk_storage_delete_proto __weak; 7917 7918 static const struct bpf_func_proto * 7919 cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7920 { 7921 const struct bpf_func_proto *func_proto; 7922 7923 func_proto = cgroup_common_func_proto(func_id, prog); 7924 if (func_proto) 7925 return func_proto; 7926 7927 switch (func_id) { 7928 case BPF_FUNC_sk_fullsock: 7929 return &bpf_sk_fullsock_proto; 7930 case BPF_FUNC_sk_storage_get: 7931 return &bpf_sk_storage_get_proto; 7932 case BPF_FUNC_sk_storage_delete: 7933 return &bpf_sk_storage_delete_proto; 7934 case BPF_FUNC_perf_event_output: 7935 return &bpf_skb_event_output_proto; 7936 #ifdef CONFIG_SOCK_CGROUP_DATA 7937 case BPF_FUNC_skb_cgroup_id: 7938 return &bpf_skb_cgroup_id_proto; 7939 case BPF_FUNC_skb_ancestor_cgroup_id: 7940 return &bpf_skb_ancestor_cgroup_id_proto; 7941 case BPF_FUNC_sk_cgroup_id: 7942 return &bpf_sk_cgroup_id_proto; 7943 case BPF_FUNC_sk_ancestor_cgroup_id: 7944 return &bpf_sk_ancestor_cgroup_id_proto; 7945 #endif 7946 #ifdef CONFIG_INET 7947 case BPF_FUNC_sk_lookup_tcp: 7948 return &bpf_sk_lookup_tcp_proto; 7949 case BPF_FUNC_sk_lookup_udp: 7950 return &bpf_sk_lookup_udp_proto; 7951 case BPF_FUNC_sk_release: 7952 return &bpf_sk_release_proto; 7953 case BPF_FUNC_skc_lookup_tcp: 7954 return &bpf_skc_lookup_tcp_proto; 7955 case BPF_FUNC_tcp_sock: 7956 return &bpf_tcp_sock_proto; 7957 case BPF_FUNC_get_listener_sock: 7958 return &bpf_get_listener_sock_proto; 7959 case BPF_FUNC_skb_ecn_set_ce: 7960 return &bpf_skb_ecn_set_ce_proto; 7961 #endif 7962 default: 7963 return sk_filter_func_proto(func_id, prog); 7964 } 7965 } 7966 7967 static const struct bpf_func_proto * 7968 tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7969 { 7970 switch (func_id) { 7971 case BPF_FUNC_skb_store_bytes: 7972 return &bpf_skb_store_bytes_proto; 7973 case BPF_FUNC_skb_load_bytes: 7974 return &bpf_skb_load_bytes_proto; 7975 case BPF_FUNC_skb_load_bytes_relative: 7976 return &bpf_skb_load_bytes_relative_proto; 7977 case BPF_FUNC_skb_pull_data: 7978 return &bpf_skb_pull_data_proto; 7979 case BPF_FUNC_csum_diff: 7980 return &bpf_csum_diff_proto; 7981 case BPF_FUNC_csum_update: 7982 return &bpf_csum_update_proto; 7983 case BPF_FUNC_csum_level: 7984 return &bpf_csum_level_proto; 7985 case BPF_FUNC_l3_csum_replace: 7986 return &bpf_l3_csum_replace_proto; 7987 case BPF_FUNC_l4_csum_replace: 7988 return &bpf_l4_csum_replace_proto; 7989 case BPF_FUNC_clone_redirect: 7990 return &bpf_clone_redirect_proto; 7991 case BPF_FUNC_get_cgroup_classid: 7992 return &bpf_get_cgroup_classid_proto; 7993 case BPF_FUNC_skb_vlan_push: 7994 return &bpf_skb_vlan_push_proto; 7995 case BPF_FUNC_skb_vlan_pop: 7996 return &bpf_skb_vlan_pop_proto; 7997 case BPF_FUNC_skb_change_proto: 7998 return &bpf_skb_change_proto_proto; 7999 case BPF_FUNC_skb_change_type: 8000 return &bpf_skb_change_type_proto; 8001 case BPF_FUNC_skb_adjust_room: 8002 return &bpf_skb_adjust_room_proto; 8003 case BPF_FUNC_skb_change_tail: 8004 return &bpf_skb_change_tail_proto; 8005 case BPF_FUNC_skb_change_head: 8006 return &bpf_skb_change_head_proto; 8007 case BPF_FUNC_skb_get_tunnel_key: 8008 return &bpf_skb_get_tunnel_key_proto; 8009 case BPF_FUNC_skb_set_tunnel_key: 8010 return bpf_get_skb_set_tunnel_proto(func_id); 8011 case BPF_FUNC_skb_get_tunnel_opt: 8012 return &bpf_skb_get_tunnel_opt_proto; 8013 case BPF_FUNC_skb_set_tunnel_opt: 8014 return bpf_get_skb_set_tunnel_proto(func_id); 8015 case BPF_FUNC_redirect: 8016 return &bpf_redirect_proto; 8017 case BPF_FUNC_redirect_neigh: 8018 return &bpf_redirect_neigh_proto; 8019 case BPF_FUNC_redirect_peer: 8020 return &bpf_redirect_peer_proto; 8021 case BPF_FUNC_get_route_realm: 8022 return &bpf_get_route_realm_proto; 8023 case BPF_FUNC_get_hash_recalc: 8024 return &bpf_get_hash_recalc_proto; 8025 case BPF_FUNC_set_hash_invalid: 8026 return &bpf_set_hash_invalid_proto; 8027 case BPF_FUNC_set_hash: 8028 return &bpf_set_hash_proto; 8029 case BPF_FUNC_perf_event_output: 8030 return &bpf_skb_event_output_proto; 8031 case BPF_FUNC_get_smp_processor_id: 8032 return &bpf_get_smp_processor_id_proto; 8033 case BPF_FUNC_skb_under_cgroup: 8034 return &bpf_skb_under_cgroup_proto; 8035 case BPF_FUNC_get_socket_cookie: 8036 return &bpf_get_socket_cookie_proto; 8037 case BPF_FUNC_get_socket_uid: 8038 return &bpf_get_socket_uid_proto; 8039 case BPF_FUNC_fib_lookup: 8040 return &bpf_skb_fib_lookup_proto; 8041 case BPF_FUNC_check_mtu: 8042 return &bpf_skb_check_mtu_proto; 8043 case BPF_FUNC_sk_fullsock: 8044 return &bpf_sk_fullsock_proto; 8045 case BPF_FUNC_sk_storage_get: 8046 return &bpf_sk_storage_get_proto; 8047 case BPF_FUNC_sk_storage_delete: 8048 return &bpf_sk_storage_delete_proto; 8049 #ifdef CONFIG_XFRM 8050 case BPF_FUNC_skb_get_xfrm_state: 8051 return &bpf_skb_get_xfrm_state_proto; 8052 #endif 8053 #ifdef CONFIG_CGROUP_NET_CLASSID 8054 case BPF_FUNC_skb_cgroup_classid: 8055 return &bpf_skb_cgroup_classid_proto; 8056 #endif 8057 #ifdef CONFIG_SOCK_CGROUP_DATA 8058 case BPF_FUNC_skb_cgroup_id: 8059 return &bpf_skb_cgroup_id_proto; 8060 case BPF_FUNC_skb_ancestor_cgroup_id: 8061 return &bpf_skb_ancestor_cgroup_id_proto; 8062 #endif 8063 #ifdef CONFIG_INET 8064 case BPF_FUNC_sk_lookup_tcp: 8065 return &bpf_tc_sk_lookup_tcp_proto; 8066 case BPF_FUNC_sk_lookup_udp: 8067 return &bpf_tc_sk_lookup_udp_proto; 8068 case BPF_FUNC_sk_release: 8069 return &bpf_sk_release_proto; 8070 case BPF_FUNC_tcp_sock: 8071 return &bpf_tcp_sock_proto; 8072 case BPF_FUNC_get_listener_sock: 8073 return &bpf_get_listener_sock_proto; 8074 case BPF_FUNC_skc_lookup_tcp: 8075 return &bpf_tc_skc_lookup_tcp_proto; 8076 case BPF_FUNC_tcp_check_syncookie: 8077 return &bpf_tcp_check_syncookie_proto; 8078 case BPF_FUNC_skb_ecn_set_ce: 8079 return &bpf_skb_ecn_set_ce_proto; 8080 case BPF_FUNC_tcp_gen_syncookie: 8081 return &bpf_tcp_gen_syncookie_proto; 8082 case BPF_FUNC_sk_assign: 8083 return &bpf_sk_assign_proto; 8084 case BPF_FUNC_skb_set_tstamp: 8085 return &bpf_skb_set_tstamp_proto; 8086 #ifdef CONFIG_SYN_COOKIES 8087 case BPF_FUNC_tcp_raw_gen_syncookie_ipv4: 8088 return &bpf_tcp_raw_gen_syncookie_ipv4_proto; 8089 case BPF_FUNC_tcp_raw_gen_syncookie_ipv6: 8090 return &bpf_tcp_raw_gen_syncookie_ipv6_proto; 8091 case BPF_FUNC_tcp_raw_check_syncookie_ipv4: 8092 return &bpf_tcp_raw_check_syncookie_ipv4_proto; 8093 case BPF_FUNC_tcp_raw_check_syncookie_ipv6: 8094 return &bpf_tcp_raw_check_syncookie_ipv6_proto; 8095 #endif 8096 #endif 8097 default: 8098 return bpf_sk_base_func_proto(func_id); 8099 } 8100 } 8101 8102 static const struct bpf_func_proto * 8103 xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8104 { 8105 switch (func_id) { 8106 case BPF_FUNC_perf_event_output: 8107 return &bpf_xdp_event_output_proto; 8108 case BPF_FUNC_get_smp_processor_id: 8109 return &bpf_get_smp_processor_id_proto; 8110 case BPF_FUNC_csum_diff: 8111 return &bpf_csum_diff_proto; 8112 case BPF_FUNC_xdp_adjust_head: 8113 return &bpf_xdp_adjust_head_proto; 8114 case BPF_FUNC_xdp_adjust_meta: 8115 return &bpf_xdp_adjust_meta_proto; 8116 case BPF_FUNC_redirect: 8117 return &bpf_xdp_redirect_proto; 8118 case BPF_FUNC_redirect_map: 8119 return &bpf_xdp_redirect_map_proto; 8120 case BPF_FUNC_xdp_adjust_tail: 8121 return &bpf_xdp_adjust_tail_proto; 8122 case BPF_FUNC_xdp_get_buff_len: 8123 return &bpf_xdp_get_buff_len_proto; 8124 case BPF_FUNC_xdp_load_bytes: 8125 return &bpf_xdp_load_bytes_proto; 8126 case BPF_FUNC_xdp_store_bytes: 8127 return &bpf_xdp_store_bytes_proto; 8128 case BPF_FUNC_fib_lookup: 8129 return &bpf_xdp_fib_lookup_proto; 8130 case BPF_FUNC_check_mtu: 8131 return &bpf_xdp_check_mtu_proto; 8132 #ifdef CONFIG_INET 8133 case BPF_FUNC_sk_lookup_udp: 8134 return &bpf_xdp_sk_lookup_udp_proto; 8135 case BPF_FUNC_sk_lookup_tcp: 8136 return &bpf_xdp_sk_lookup_tcp_proto; 8137 case BPF_FUNC_sk_release: 8138 return &bpf_sk_release_proto; 8139 case BPF_FUNC_skc_lookup_tcp: 8140 return &bpf_xdp_skc_lookup_tcp_proto; 8141 case BPF_FUNC_tcp_check_syncookie: 8142 return &bpf_tcp_check_syncookie_proto; 8143 case BPF_FUNC_tcp_gen_syncookie: 8144 return &bpf_tcp_gen_syncookie_proto; 8145 #ifdef CONFIG_SYN_COOKIES 8146 case BPF_FUNC_tcp_raw_gen_syncookie_ipv4: 8147 return &bpf_tcp_raw_gen_syncookie_ipv4_proto; 8148 case BPF_FUNC_tcp_raw_gen_syncookie_ipv6: 8149 return &bpf_tcp_raw_gen_syncookie_ipv6_proto; 8150 case BPF_FUNC_tcp_raw_check_syncookie_ipv4: 8151 return &bpf_tcp_raw_check_syncookie_ipv4_proto; 8152 case BPF_FUNC_tcp_raw_check_syncookie_ipv6: 8153 return &bpf_tcp_raw_check_syncookie_ipv6_proto; 8154 #endif 8155 #endif 8156 default: 8157 return bpf_sk_base_func_proto(func_id); 8158 } 8159 8160 #if IS_MODULE(CONFIG_NF_CONNTRACK) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES) 8161 /* The nf_conn___init type is used in the NF_CONNTRACK kfuncs. The 8162 * kfuncs are defined in two different modules, and we want to be able 8163 * to use them interchangably with the same BTF type ID. Because modules 8164 * can't de-duplicate BTF IDs between each other, we need the type to be 8165 * referenced in the vmlinux BTF or the verifier will get confused about 8166 * the different types. So we add this dummy type reference which will 8167 * be included in vmlinux BTF, allowing both modules to refer to the 8168 * same type ID. 8169 */ 8170 BTF_TYPE_EMIT(struct nf_conn___init); 8171 #endif 8172 } 8173 8174 const struct bpf_func_proto bpf_sock_map_update_proto __weak; 8175 const struct bpf_func_proto bpf_sock_hash_update_proto __weak; 8176 8177 static const struct bpf_func_proto * 8178 sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8179 { 8180 const struct bpf_func_proto *func_proto; 8181 8182 func_proto = cgroup_common_func_proto(func_id, prog); 8183 if (func_proto) 8184 return func_proto; 8185 8186 switch (func_id) { 8187 case BPF_FUNC_setsockopt: 8188 return &bpf_sock_ops_setsockopt_proto; 8189 case BPF_FUNC_getsockopt: 8190 return &bpf_sock_ops_getsockopt_proto; 8191 case BPF_FUNC_sock_ops_cb_flags_set: 8192 return &bpf_sock_ops_cb_flags_set_proto; 8193 case BPF_FUNC_sock_map_update: 8194 return &bpf_sock_map_update_proto; 8195 case BPF_FUNC_sock_hash_update: 8196 return &bpf_sock_hash_update_proto; 8197 case BPF_FUNC_get_socket_cookie: 8198 return &bpf_get_socket_cookie_sock_ops_proto; 8199 case BPF_FUNC_perf_event_output: 8200 return &bpf_event_output_data_proto; 8201 case BPF_FUNC_sk_storage_get: 8202 return &bpf_sk_storage_get_proto; 8203 case BPF_FUNC_sk_storage_delete: 8204 return &bpf_sk_storage_delete_proto; 8205 case BPF_FUNC_get_netns_cookie: 8206 return &bpf_get_netns_cookie_sock_ops_proto; 8207 #ifdef CONFIG_INET 8208 case BPF_FUNC_load_hdr_opt: 8209 return &bpf_sock_ops_load_hdr_opt_proto; 8210 case BPF_FUNC_store_hdr_opt: 8211 return &bpf_sock_ops_store_hdr_opt_proto; 8212 case BPF_FUNC_reserve_hdr_opt: 8213 return &bpf_sock_ops_reserve_hdr_opt_proto; 8214 case BPF_FUNC_tcp_sock: 8215 return &bpf_tcp_sock_proto; 8216 #endif /* CONFIG_INET */ 8217 default: 8218 return bpf_sk_base_func_proto(func_id); 8219 } 8220 } 8221 8222 const struct bpf_func_proto bpf_msg_redirect_map_proto __weak; 8223 const struct bpf_func_proto bpf_msg_redirect_hash_proto __weak; 8224 8225 static const struct bpf_func_proto * 8226 sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8227 { 8228 switch (func_id) { 8229 case BPF_FUNC_msg_redirect_map: 8230 return &bpf_msg_redirect_map_proto; 8231 case BPF_FUNC_msg_redirect_hash: 8232 return &bpf_msg_redirect_hash_proto; 8233 case BPF_FUNC_msg_apply_bytes: 8234 return &bpf_msg_apply_bytes_proto; 8235 case BPF_FUNC_msg_cork_bytes: 8236 return &bpf_msg_cork_bytes_proto; 8237 case BPF_FUNC_msg_pull_data: 8238 return &bpf_msg_pull_data_proto; 8239 case BPF_FUNC_msg_push_data: 8240 return &bpf_msg_push_data_proto; 8241 case BPF_FUNC_msg_pop_data: 8242 return &bpf_msg_pop_data_proto; 8243 case BPF_FUNC_perf_event_output: 8244 return &bpf_event_output_data_proto; 8245 case BPF_FUNC_get_current_uid_gid: 8246 return &bpf_get_current_uid_gid_proto; 8247 case BPF_FUNC_get_current_pid_tgid: 8248 return &bpf_get_current_pid_tgid_proto; 8249 case BPF_FUNC_sk_storage_get: 8250 return &bpf_sk_storage_get_proto; 8251 case BPF_FUNC_sk_storage_delete: 8252 return &bpf_sk_storage_delete_proto; 8253 case BPF_FUNC_get_netns_cookie: 8254 return &bpf_get_netns_cookie_sk_msg_proto; 8255 #ifdef CONFIG_CGROUP_NET_CLASSID 8256 case BPF_FUNC_get_cgroup_classid: 8257 return &bpf_get_cgroup_classid_curr_proto; 8258 #endif 8259 default: 8260 return bpf_sk_base_func_proto(func_id); 8261 } 8262 } 8263 8264 const struct bpf_func_proto bpf_sk_redirect_map_proto __weak; 8265 const struct bpf_func_proto bpf_sk_redirect_hash_proto __weak; 8266 8267 static const struct bpf_func_proto * 8268 sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8269 { 8270 switch (func_id) { 8271 case BPF_FUNC_skb_store_bytes: 8272 return &bpf_skb_store_bytes_proto; 8273 case BPF_FUNC_skb_load_bytes: 8274 return &bpf_skb_load_bytes_proto; 8275 case BPF_FUNC_skb_pull_data: 8276 return &sk_skb_pull_data_proto; 8277 case BPF_FUNC_skb_change_tail: 8278 return &sk_skb_change_tail_proto; 8279 case BPF_FUNC_skb_change_head: 8280 return &sk_skb_change_head_proto; 8281 case BPF_FUNC_skb_adjust_room: 8282 return &sk_skb_adjust_room_proto; 8283 case BPF_FUNC_get_socket_cookie: 8284 return &bpf_get_socket_cookie_proto; 8285 case BPF_FUNC_get_socket_uid: 8286 return &bpf_get_socket_uid_proto; 8287 case BPF_FUNC_sk_redirect_map: 8288 return &bpf_sk_redirect_map_proto; 8289 case BPF_FUNC_sk_redirect_hash: 8290 return &bpf_sk_redirect_hash_proto; 8291 case BPF_FUNC_perf_event_output: 8292 return &bpf_skb_event_output_proto; 8293 #ifdef CONFIG_INET 8294 case BPF_FUNC_sk_lookup_tcp: 8295 return &bpf_sk_lookup_tcp_proto; 8296 case BPF_FUNC_sk_lookup_udp: 8297 return &bpf_sk_lookup_udp_proto; 8298 case BPF_FUNC_sk_release: 8299 return &bpf_sk_release_proto; 8300 case BPF_FUNC_skc_lookup_tcp: 8301 return &bpf_skc_lookup_tcp_proto; 8302 #endif 8303 default: 8304 return bpf_sk_base_func_proto(func_id); 8305 } 8306 } 8307 8308 static const struct bpf_func_proto * 8309 flow_dissector_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8310 { 8311 switch (func_id) { 8312 case BPF_FUNC_skb_load_bytes: 8313 return &bpf_flow_dissector_load_bytes_proto; 8314 default: 8315 return bpf_sk_base_func_proto(func_id); 8316 } 8317 } 8318 8319 static const struct bpf_func_proto * 8320 lwt_out_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8321 { 8322 switch (func_id) { 8323 case BPF_FUNC_skb_load_bytes: 8324 return &bpf_skb_load_bytes_proto; 8325 case BPF_FUNC_skb_pull_data: 8326 return &bpf_skb_pull_data_proto; 8327 case BPF_FUNC_csum_diff: 8328 return &bpf_csum_diff_proto; 8329 case BPF_FUNC_get_cgroup_classid: 8330 return &bpf_get_cgroup_classid_proto; 8331 case BPF_FUNC_get_route_realm: 8332 return &bpf_get_route_realm_proto; 8333 case BPF_FUNC_get_hash_recalc: 8334 return &bpf_get_hash_recalc_proto; 8335 case BPF_FUNC_perf_event_output: 8336 return &bpf_skb_event_output_proto; 8337 case BPF_FUNC_get_smp_processor_id: 8338 return &bpf_get_smp_processor_id_proto; 8339 case BPF_FUNC_skb_under_cgroup: 8340 return &bpf_skb_under_cgroup_proto; 8341 default: 8342 return bpf_sk_base_func_proto(func_id); 8343 } 8344 } 8345 8346 static const struct bpf_func_proto * 8347 lwt_in_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8348 { 8349 switch (func_id) { 8350 case BPF_FUNC_lwt_push_encap: 8351 return &bpf_lwt_in_push_encap_proto; 8352 default: 8353 return lwt_out_func_proto(func_id, prog); 8354 } 8355 } 8356 8357 static const struct bpf_func_proto * 8358 lwt_xmit_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8359 { 8360 switch (func_id) { 8361 case BPF_FUNC_skb_get_tunnel_key: 8362 return &bpf_skb_get_tunnel_key_proto; 8363 case BPF_FUNC_skb_set_tunnel_key: 8364 return bpf_get_skb_set_tunnel_proto(func_id); 8365 case BPF_FUNC_skb_get_tunnel_opt: 8366 return &bpf_skb_get_tunnel_opt_proto; 8367 case BPF_FUNC_skb_set_tunnel_opt: 8368 return bpf_get_skb_set_tunnel_proto(func_id); 8369 case BPF_FUNC_redirect: 8370 return &bpf_redirect_proto; 8371 case BPF_FUNC_clone_redirect: 8372 return &bpf_clone_redirect_proto; 8373 case BPF_FUNC_skb_change_tail: 8374 return &bpf_skb_change_tail_proto; 8375 case BPF_FUNC_skb_change_head: 8376 return &bpf_skb_change_head_proto; 8377 case BPF_FUNC_skb_store_bytes: 8378 return &bpf_skb_store_bytes_proto; 8379 case BPF_FUNC_csum_update: 8380 return &bpf_csum_update_proto; 8381 case BPF_FUNC_csum_level: 8382 return &bpf_csum_level_proto; 8383 case BPF_FUNC_l3_csum_replace: 8384 return &bpf_l3_csum_replace_proto; 8385 case BPF_FUNC_l4_csum_replace: 8386 return &bpf_l4_csum_replace_proto; 8387 case BPF_FUNC_set_hash_invalid: 8388 return &bpf_set_hash_invalid_proto; 8389 case BPF_FUNC_lwt_push_encap: 8390 return &bpf_lwt_xmit_push_encap_proto; 8391 default: 8392 return lwt_out_func_proto(func_id, prog); 8393 } 8394 } 8395 8396 static const struct bpf_func_proto * 8397 lwt_seg6local_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8398 { 8399 switch (func_id) { 8400 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 8401 case BPF_FUNC_lwt_seg6_store_bytes: 8402 return &bpf_lwt_seg6_store_bytes_proto; 8403 case BPF_FUNC_lwt_seg6_action: 8404 return &bpf_lwt_seg6_action_proto; 8405 case BPF_FUNC_lwt_seg6_adjust_srh: 8406 return &bpf_lwt_seg6_adjust_srh_proto; 8407 #endif 8408 default: 8409 return lwt_out_func_proto(func_id, prog); 8410 } 8411 } 8412 8413 static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type, 8414 const struct bpf_prog *prog, 8415 struct bpf_insn_access_aux *info) 8416 { 8417 const int size_default = sizeof(__u32); 8418 8419 if (off < 0 || off >= sizeof(struct __sk_buff)) 8420 return false; 8421 8422 /* The verifier guarantees that size > 0. */ 8423 if (off % size != 0) 8424 return false; 8425 8426 switch (off) { 8427 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8428 if (off + size > offsetofend(struct __sk_buff, cb[4])) 8429 return false; 8430 break; 8431 case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]): 8432 case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]): 8433 case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4): 8434 case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4): 8435 case bpf_ctx_range(struct __sk_buff, data): 8436 case bpf_ctx_range(struct __sk_buff, data_meta): 8437 case bpf_ctx_range(struct __sk_buff, data_end): 8438 if (size != size_default) 8439 return false; 8440 break; 8441 case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): 8442 return false; 8443 case bpf_ctx_range(struct __sk_buff, hwtstamp): 8444 if (type == BPF_WRITE || size != sizeof(__u64)) 8445 return false; 8446 break; 8447 case bpf_ctx_range(struct __sk_buff, tstamp): 8448 if (size != sizeof(__u64)) 8449 return false; 8450 break; 8451 case offsetof(struct __sk_buff, sk): 8452 if (type == BPF_WRITE || size != sizeof(__u64)) 8453 return false; 8454 info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL; 8455 break; 8456 case offsetof(struct __sk_buff, tstamp_type): 8457 return false; 8458 case offsetofend(struct __sk_buff, tstamp_type) ... offsetof(struct __sk_buff, hwtstamp) - 1: 8459 /* Explicitly prohibit access to padding in __sk_buff. */ 8460 return false; 8461 default: 8462 /* Only narrow read access allowed for now. */ 8463 if (type == BPF_WRITE) { 8464 if (size != size_default) 8465 return false; 8466 } else { 8467 bpf_ctx_record_field_size(info, size_default); 8468 if (!bpf_ctx_narrow_access_ok(off, size, size_default)) 8469 return false; 8470 } 8471 } 8472 8473 return true; 8474 } 8475 8476 static bool sk_filter_is_valid_access(int off, int size, 8477 enum bpf_access_type type, 8478 const struct bpf_prog *prog, 8479 struct bpf_insn_access_aux *info) 8480 { 8481 switch (off) { 8482 case bpf_ctx_range(struct __sk_buff, tc_classid): 8483 case bpf_ctx_range(struct __sk_buff, data): 8484 case bpf_ctx_range(struct __sk_buff, data_meta): 8485 case bpf_ctx_range(struct __sk_buff, data_end): 8486 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 8487 case bpf_ctx_range(struct __sk_buff, tstamp): 8488 case bpf_ctx_range(struct __sk_buff, wire_len): 8489 case bpf_ctx_range(struct __sk_buff, hwtstamp): 8490 return false; 8491 } 8492 8493 if (type == BPF_WRITE) { 8494 switch (off) { 8495 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8496 break; 8497 default: 8498 return false; 8499 } 8500 } 8501 8502 return bpf_skb_is_valid_access(off, size, type, prog, info); 8503 } 8504 8505 static bool cg_skb_is_valid_access(int off, int size, 8506 enum bpf_access_type type, 8507 const struct bpf_prog *prog, 8508 struct bpf_insn_access_aux *info) 8509 { 8510 switch (off) { 8511 case bpf_ctx_range(struct __sk_buff, tc_classid): 8512 case bpf_ctx_range(struct __sk_buff, data_meta): 8513 case bpf_ctx_range(struct __sk_buff, wire_len): 8514 return false; 8515 case bpf_ctx_range(struct __sk_buff, data): 8516 case bpf_ctx_range(struct __sk_buff, data_end): 8517 if (!bpf_capable()) 8518 return false; 8519 break; 8520 } 8521 8522 if (type == BPF_WRITE) { 8523 switch (off) { 8524 case bpf_ctx_range(struct __sk_buff, mark): 8525 case bpf_ctx_range(struct __sk_buff, priority): 8526 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8527 break; 8528 case bpf_ctx_range(struct __sk_buff, tstamp): 8529 if (!bpf_capable()) 8530 return false; 8531 break; 8532 default: 8533 return false; 8534 } 8535 } 8536 8537 switch (off) { 8538 case bpf_ctx_range(struct __sk_buff, data): 8539 info->reg_type = PTR_TO_PACKET; 8540 break; 8541 case bpf_ctx_range(struct __sk_buff, data_end): 8542 info->reg_type = PTR_TO_PACKET_END; 8543 break; 8544 } 8545 8546 return bpf_skb_is_valid_access(off, size, type, prog, info); 8547 } 8548 8549 static bool lwt_is_valid_access(int off, int size, 8550 enum bpf_access_type type, 8551 const struct bpf_prog *prog, 8552 struct bpf_insn_access_aux *info) 8553 { 8554 switch (off) { 8555 case bpf_ctx_range(struct __sk_buff, tc_classid): 8556 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 8557 case bpf_ctx_range(struct __sk_buff, data_meta): 8558 case bpf_ctx_range(struct __sk_buff, tstamp): 8559 case bpf_ctx_range(struct __sk_buff, wire_len): 8560 case bpf_ctx_range(struct __sk_buff, hwtstamp): 8561 return false; 8562 } 8563 8564 if (type == BPF_WRITE) { 8565 switch (off) { 8566 case bpf_ctx_range(struct __sk_buff, mark): 8567 case bpf_ctx_range(struct __sk_buff, priority): 8568 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8569 break; 8570 default: 8571 return false; 8572 } 8573 } 8574 8575 switch (off) { 8576 case bpf_ctx_range(struct __sk_buff, data): 8577 info->reg_type = PTR_TO_PACKET; 8578 break; 8579 case bpf_ctx_range(struct __sk_buff, data_end): 8580 info->reg_type = PTR_TO_PACKET_END; 8581 break; 8582 } 8583 8584 return bpf_skb_is_valid_access(off, size, type, prog, info); 8585 } 8586 8587 /* Attach type specific accesses */ 8588 static bool __sock_filter_check_attach_type(int off, 8589 enum bpf_access_type access_type, 8590 enum bpf_attach_type attach_type) 8591 { 8592 switch (off) { 8593 case offsetof(struct bpf_sock, bound_dev_if): 8594 case offsetof(struct bpf_sock, mark): 8595 case offsetof(struct bpf_sock, priority): 8596 switch (attach_type) { 8597 case BPF_CGROUP_INET_SOCK_CREATE: 8598 case BPF_CGROUP_INET_SOCK_RELEASE: 8599 goto full_access; 8600 default: 8601 return false; 8602 } 8603 case bpf_ctx_range(struct bpf_sock, src_ip4): 8604 switch (attach_type) { 8605 case BPF_CGROUP_INET4_POST_BIND: 8606 goto read_only; 8607 default: 8608 return false; 8609 } 8610 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 8611 switch (attach_type) { 8612 case BPF_CGROUP_INET6_POST_BIND: 8613 goto read_only; 8614 default: 8615 return false; 8616 } 8617 case bpf_ctx_range(struct bpf_sock, src_port): 8618 switch (attach_type) { 8619 case BPF_CGROUP_INET4_POST_BIND: 8620 case BPF_CGROUP_INET6_POST_BIND: 8621 goto read_only; 8622 default: 8623 return false; 8624 } 8625 } 8626 read_only: 8627 return access_type == BPF_READ; 8628 full_access: 8629 return true; 8630 } 8631 8632 bool bpf_sock_common_is_valid_access(int off, int size, 8633 enum bpf_access_type type, 8634 struct bpf_insn_access_aux *info) 8635 { 8636 switch (off) { 8637 case bpf_ctx_range_till(struct bpf_sock, type, priority): 8638 return false; 8639 default: 8640 return bpf_sock_is_valid_access(off, size, type, info); 8641 } 8642 } 8643 8644 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, 8645 struct bpf_insn_access_aux *info) 8646 { 8647 const int size_default = sizeof(__u32); 8648 int field_size; 8649 8650 if (off < 0 || off >= sizeof(struct bpf_sock)) 8651 return false; 8652 if (off % size != 0) 8653 return false; 8654 8655 switch (off) { 8656 case offsetof(struct bpf_sock, state): 8657 case offsetof(struct bpf_sock, family): 8658 case offsetof(struct bpf_sock, type): 8659 case offsetof(struct bpf_sock, protocol): 8660 case offsetof(struct bpf_sock, src_port): 8661 case offsetof(struct bpf_sock, rx_queue_mapping): 8662 case bpf_ctx_range(struct bpf_sock, src_ip4): 8663 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 8664 case bpf_ctx_range(struct bpf_sock, dst_ip4): 8665 case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): 8666 bpf_ctx_record_field_size(info, size_default); 8667 return bpf_ctx_narrow_access_ok(off, size, size_default); 8668 case bpf_ctx_range(struct bpf_sock, dst_port): 8669 field_size = size == size_default ? 8670 size_default : sizeof_field(struct bpf_sock, dst_port); 8671 bpf_ctx_record_field_size(info, field_size); 8672 return bpf_ctx_narrow_access_ok(off, size, field_size); 8673 case offsetofend(struct bpf_sock, dst_port) ... 8674 offsetof(struct bpf_sock, dst_ip4) - 1: 8675 return false; 8676 } 8677 8678 return size == size_default; 8679 } 8680 8681 static bool sock_filter_is_valid_access(int off, int size, 8682 enum bpf_access_type type, 8683 const struct bpf_prog *prog, 8684 struct bpf_insn_access_aux *info) 8685 { 8686 if (!bpf_sock_is_valid_access(off, size, type, info)) 8687 return false; 8688 return __sock_filter_check_attach_type(off, type, 8689 prog->expected_attach_type); 8690 } 8691 8692 static int bpf_noop_prologue(struct bpf_insn *insn_buf, bool direct_write, 8693 const struct bpf_prog *prog) 8694 { 8695 /* Neither direct read nor direct write requires any preliminary 8696 * action. 8697 */ 8698 return 0; 8699 } 8700 8701 static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write, 8702 const struct bpf_prog *prog, int drop_verdict) 8703 { 8704 struct bpf_insn *insn = insn_buf; 8705 8706 if (!direct_write) 8707 return 0; 8708 8709 /* if (!skb->cloned) 8710 * goto start; 8711 * 8712 * (Fast-path, otherwise approximation that we might be 8713 * a clone, do the rest in helper.) 8714 */ 8715 *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET); 8716 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK); 8717 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7); 8718 8719 /* ret = bpf_skb_pull_data(skb, 0); */ 8720 *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1); 8721 *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2); 8722 *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, 8723 BPF_FUNC_skb_pull_data); 8724 /* if (!ret) 8725 * goto restore; 8726 * return TC_ACT_SHOT; 8727 */ 8728 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2); 8729 *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict); 8730 *insn++ = BPF_EXIT_INSN(); 8731 8732 /* restore: */ 8733 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6); 8734 /* start: */ 8735 *insn++ = prog->insnsi[0]; 8736 8737 return insn - insn_buf; 8738 } 8739 8740 static int bpf_gen_ld_abs(const struct bpf_insn *orig, 8741 struct bpf_insn *insn_buf) 8742 { 8743 bool indirect = BPF_MODE(orig->code) == BPF_IND; 8744 struct bpf_insn *insn = insn_buf; 8745 8746 if (!indirect) { 8747 *insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm); 8748 } else { 8749 *insn++ = BPF_MOV64_REG(BPF_REG_2, orig->src_reg); 8750 if (orig->imm) 8751 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm); 8752 } 8753 /* We're guaranteed here that CTX is in R6. */ 8754 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX); 8755 8756 switch (BPF_SIZE(orig->code)) { 8757 case BPF_B: 8758 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache); 8759 break; 8760 case BPF_H: 8761 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache); 8762 break; 8763 case BPF_W: 8764 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache); 8765 break; 8766 } 8767 8768 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 2); 8769 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0); 8770 *insn++ = BPF_EXIT_INSN(); 8771 8772 return insn - insn_buf; 8773 } 8774 8775 static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write, 8776 const struct bpf_prog *prog) 8777 { 8778 return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT); 8779 } 8780 8781 static bool tc_cls_act_is_valid_access(int off, int size, 8782 enum bpf_access_type type, 8783 const struct bpf_prog *prog, 8784 struct bpf_insn_access_aux *info) 8785 { 8786 if (type == BPF_WRITE) { 8787 switch (off) { 8788 case bpf_ctx_range(struct __sk_buff, mark): 8789 case bpf_ctx_range(struct __sk_buff, tc_index): 8790 case bpf_ctx_range(struct __sk_buff, priority): 8791 case bpf_ctx_range(struct __sk_buff, tc_classid): 8792 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8793 case bpf_ctx_range(struct __sk_buff, tstamp): 8794 case bpf_ctx_range(struct __sk_buff, queue_mapping): 8795 break; 8796 default: 8797 return false; 8798 } 8799 } 8800 8801 switch (off) { 8802 case bpf_ctx_range(struct __sk_buff, data): 8803 info->reg_type = PTR_TO_PACKET; 8804 break; 8805 case bpf_ctx_range(struct __sk_buff, data_meta): 8806 info->reg_type = PTR_TO_PACKET_META; 8807 break; 8808 case bpf_ctx_range(struct __sk_buff, data_end): 8809 info->reg_type = PTR_TO_PACKET_END; 8810 break; 8811 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 8812 return false; 8813 case offsetof(struct __sk_buff, tstamp_type): 8814 /* The convert_ctx_access() on reading and writing 8815 * __sk_buff->tstamp depends on whether the bpf prog 8816 * has used __sk_buff->tstamp_type or not. 8817 * Thus, we need to set prog->tstamp_type_access 8818 * earlier during is_valid_access() here. 8819 */ 8820 ((struct bpf_prog *)prog)->tstamp_type_access = 1; 8821 return size == sizeof(__u8); 8822 } 8823 8824 return bpf_skb_is_valid_access(off, size, type, prog, info); 8825 } 8826 8827 DEFINE_MUTEX(nf_conn_btf_access_lock); 8828 EXPORT_SYMBOL_GPL(nf_conn_btf_access_lock); 8829 8830 int (*nfct_btf_struct_access)(struct bpf_verifier_log *log, 8831 const struct bpf_reg_state *reg, 8832 int off, int size); 8833 EXPORT_SYMBOL_GPL(nfct_btf_struct_access); 8834 8835 static int tc_cls_act_btf_struct_access(struct bpf_verifier_log *log, 8836 const struct bpf_reg_state *reg, 8837 int off, int size) 8838 { 8839 int ret = -EACCES; 8840 8841 mutex_lock(&nf_conn_btf_access_lock); 8842 if (nfct_btf_struct_access) 8843 ret = nfct_btf_struct_access(log, reg, off, size); 8844 mutex_unlock(&nf_conn_btf_access_lock); 8845 8846 return ret; 8847 } 8848 8849 static bool __is_valid_xdp_access(int off, int size) 8850 { 8851 if (off < 0 || off >= sizeof(struct xdp_md)) 8852 return false; 8853 if (off % size != 0) 8854 return false; 8855 if (size != sizeof(__u32)) 8856 return false; 8857 8858 return true; 8859 } 8860 8861 static bool xdp_is_valid_access(int off, int size, 8862 enum bpf_access_type type, 8863 const struct bpf_prog *prog, 8864 struct bpf_insn_access_aux *info) 8865 { 8866 if (prog->expected_attach_type != BPF_XDP_DEVMAP) { 8867 switch (off) { 8868 case offsetof(struct xdp_md, egress_ifindex): 8869 return false; 8870 } 8871 } 8872 8873 if (type == BPF_WRITE) { 8874 if (bpf_prog_is_offloaded(prog->aux)) { 8875 switch (off) { 8876 case offsetof(struct xdp_md, rx_queue_index): 8877 return __is_valid_xdp_access(off, size); 8878 } 8879 } 8880 return false; 8881 } 8882 8883 switch (off) { 8884 case offsetof(struct xdp_md, data): 8885 info->reg_type = PTR_TO_PACKET; 8886 break; 8887 case offsetof(struct xdp_md, data_meta): 8888 info->reg_type = PTR_TO_PACKET_META; 8889 break; 8890 case offsetof(struct xdp_md, data_end): 8891 info->reg_type = PTR_TO_PACKET_END; 8892 break; 8893 } 8894 8895 return __is_valid_xdp_access(off, size); 8896 } 8897 8898 void bpf_warn_invalid_xdp_action(struct net_device *dev, struct bpf_prog *prog, u32 act) 8899 { 8900 const u32 act_max = XDP_REDIRECT; 8901 8902 pr_warn_once("%s XDP return value %u on prog %s (id %d) dev %s, expect packet loss!\n", 8903 act > act_max ? "Illegal" : "Driver unsupported", 8904 act, prog->aux->name, prog->aux->id, dev ? dev->name : "N/A"); 8905 } 8906 EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action); 8907 8908 static int xdp_btf_struct_access(struct bpf_verifier_log *log, 8909 const struct bpf_reg_state *reg, 8910 int off, int size) 8911 { 8912 int ret = -EACCES; 8913 8914 mutex_lock(&nf_conn_btf_access_lock); 8915 if (nfct_btf_struct_access) 8916 ret = nfct_btf_struct_access(log, reg, off, size); 8917 mutex_unlock(&nf_conn_btf_access_lock); 8918 8919 return ret; 8920 } 8921 8922 static bool sock_addr_is_valid_access(int off, int size, 8923 enum bpf_access_type type, 8924 const struct bpf_prog *prog, 8925 struct bpf_insn_access_aux *info) 8926 { 8927 const int size_default = sizeof(__u32); 8928 8929 if (off < 0 || off >= sizeof(struct bpf_sock_addr)) 8930 return false; 8931 if (off % size != 0) 8932 return false; 8933 8934 /* Disallow access to IPv6 fields from IPv4 contex and vise 8935 * versa. 8936 */ 8937 switch (off) { 8938 case bpf_ctx_range(struct bpf_sock_addr, user_ip4): 8939 switch (prog->expected_attach_type) { 8940 case BPF_CGROUP_INET4_BIND: 8941 case BPF_CGROUP_INET4_CONNECT: 8942 case BPF_CGROUP_INET4_GETPEERNAME: 8943 case BPF_CGROUP_INET4_GETSOCKNAME: 8944 case BPF_CGROUP_UDP4_SENDMSG: 8945 case BPF_CGROUP_UDP4_RECVMSG: 8946 break; 8947 default: 8948 return false; 8949 } 8950 break; 8951 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 8952 switch (prog->expected_attach_type) { 8953 case BPF_CGROUP_INET6_BIND: 8954 case BPF_CGROUP_INET6_CONNECT: 8955 case BPF_CGROUP_INET6_GETPEERNAME: 8956 case BPF_CGROUP_INET6_GETSOCKNAME: 8957 case BPF_CGROUP_UDP6_SENDMSG: 8958 case BPF_CGROUP_UDP6_RECVMSG: 8959 break; 8960 default: 8961 return false; 8962 } 8963 break; 8964 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): 8965 switch (prog->expected_attach_type) { 8966 case BPF_CGROUP_UDP4_SENDMSG: 8967 break; 8968 default: 8969 return false; 8970 } 8971 break; 8972 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 8973 msg_src_ip6[3]): 8974 switch (prog->expected_attach_type) { 8975 case BPF_CGROUP_UDP6_SENDMSG: 8976 break; 8977 default: 8978 return false; 8979 } 8980 break; 8981 } 8982 8983 switch (off) { 8984 case bpf_ctx_range(struct bpf_sock_addr, user_ip4): 8985 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 8986 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): 8987 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 8988 msg_src_ip6[3]): 8989 case bpf_ctx_range(struct bpf_sock_addr, user_port): 8990 if (type == BPF_READ) { 8991 bpf_ctx_record_field_size(info, size_default); 8992 8993 if (bpf_ctx_wide_access_ok(off, size, 8994 struct bpf_sock_addr, 8995 user_ip6)) 8996 return true; 8997 8998 if (bpf_ctx_wide_access_ok(off, size, 8999 struct bpf_sock_addr, 9000 msg_src_ip6)) 9001 return true; 9002 9003 if (!bpf_ctx_narrow_access_ok(off, size, size_default)) 9004 return false; 9005 } else { 9006 if (bpf_ctx_wide_access_ok(off, size, 9007 struct bpf_sock_addr, 9008 user_ip6)) 9009 return true; 9010 9011 if (bpf_ctx_wide_access_ok(off, size, 9012 struct bpf_sock_addr, 9013 msg_src_ip6)) 9014 return true; 9015 9016 if (size != size_default) 9017 return false; 9018 } 9019 break; 9020 case offsetof(struct bpf_sock_addr, sk): 9021 if (type != BPF_READ) 9022 return false; 9023 if (size != sizeof(__u64)) 9024 return false; 9025 info->reg_type = PTR_TO_SOCKET; 9026 break; 9027 default: 9028 if (type == BPF_READ) { 9029 if (size != size_default) 9030 return false; 9031 } else { 9032 return false; 9033 } 9034 } 9035 9036 return true; 9037 } 9038 9039 static bool sock_ops_is_valid_access(int off, int size, 9040 enum bpf_access_type type, 9041 const struct bpf_prog *prog, 9042 struct bpf_insn_access_aux *info) 9043 { 9044 const int size_default = sizeof(__u32); 9045 9046 if (off < 0 || off >= sizeof(struct bpf_sock_ops)) 9047 return false; 9048 9049 /* The verifier guarantees that size > 0. */ 9050 if (off % size != 0) 9051 return false; 9052 9053 if (type == BPF_WRITE) { 9054 switch (off) { 9055 case offsetof(struct bpf_sock_ops, reply): 9056 case offsetof(struct bpf_sock_ops, sk_txhash): 9057 if (size != size_default) 9058 return false; 9059 break; 9060 default: 9061 return false; 9062 } 9063 } else { 9064 switch (off) { 9065 case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received, 9066 bytes_acked): 9067 if (size != sizeof(__u64)) 9068 return false; 9069 break; 9070 case offsetof(struct bpf_sock_ops, sk): 9071 if (size != sizeof(__u64)) 9072 return false; 9073 info->reg_type = PTR_TO_SOCKET_OR_NULL; 9074 break; 9075 case offsetof(struct bpf_sock_ops, skb_data): 9076 if (size != sizeof(__u64)) 9077 return false; 9078 info->reg_type = PTR_TO_PACKET; 9079 break; 9080 case offsetof(struct bpf_sock_ops, skb_data_end): 9081 if (size != sizeof(__u64)) 9082 return false; 9083 info->reg_type = PTR_TO_PACKET_END; 9084 break; 9085 case offsetof(struct bpf_sock_ops, skb_tcp_flags): 9086 bpf_ctx_record_field_size(info, size_default); 9087 return bpf_ctx_narrow_access_ok(off, size, 9088 size_default); 9089 case offsetof(struct bpf_sock_ops, skb_hwtstamp): 9090 if (size != sizeof(__u64)) 9091 return false; 9092 break; 9093 default: 9094 if (size != size_default) 9095 return false; 9096 break; 9097 } 9098 } 9099 9100 return true; 9101 } 9102 9103 static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write, 9104 const struct bpf_prog *prog) 9105 { 9106 return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP); 9107 } 9108 9109 static bool sk_skb_is_valid_access(int off, int size, 9110 enum bpf_access_type type, 9111 const struct bpf_prog *prog, 9112 struct bpf_insn_access_aux *info) 9113 { 9114 switch (off) { 9115 case bpf_ctx_range(struct __sk_buff, tc_classid): 9116 case bpf_ctx_range(struct __sk_buff, data_meta): 9117 case bpf_ctx_range(struct __sk_buff, tstamp): 9118 case bpf_ctx_range(struct __sk_buff, wire_len): 9119 case bpf_ctx_range(struct __sk_buff, hwtstamp): 9120 return false; 9121 } 9122 9123 if (type == BPF_WRITE) { 9124 switch (off) { 9125 case bpf_ctx_range(struct __sk_buff, tc_index): 9126 case bpf_ctx_range(struct __sk_buff, priority): 9127 break; 9128 default: 9129 return false; 9130 } 9131 } 9132 9133 switch (off) { 9134 case bpf_ctx_range(struct __sk_buff, mark): 9135 return false; 9136 case bpf_ctx_range(struct __sk_buff, data): 9137 info->reg_type = PTR_TO_PACKET; 9138 break; 9139 case bpf_ctx_range(struct __sk_buff, data_end): 9140 info->reg_type = PTR_TO_PACKET_END; 9141 break; 9142 } 9143 9144 return bpf_skb_is_valid_access(off, size, type, prog, info); 9145 } 9146 9147 static bool sk_msg_is_valid_access(int off, int size, 9148 enum bpf_access_type type, 9149 const struct bpf_prog *prog, 9150 struct bpf_insn_access_aux *info) 9151 { 9152 if (type == BPF_WRITE) 9153 return false; 9154 9155 if (off % size != 0) 9156 return false; 9157 9158 switch (off) { 9159 case offsetof(struct sk_msg_md, data): 9160 info->reg_type = PTR_TO_PACKET; 9161 if (size != sizeof(__u64)) 9162 return false; 9163 break; 9164 case offsetof(struct sk_msg_md, data_end): 9165 info->reg_type = PTR_TO_PACKET_END; 9166 if (size != sizeof(__u64)) 9167 return false; 9168 break; 9169 case offsetof(struct sk_msg_md, sk): 9170 if (size != sizeof(__u64)) 9171 return false; 9172 info->reg_type = PTR_TO_SOCKET; 9173 break; 9174 case bpf_ctx_range(struct sk_msg_md, family): 9175 case bpf_ctx_range(struct sk_msg_md, remote_ip4): 9176 case bpf_ctx_range(struct sk_msg_md, local_ip4): 9177 case bpf_ctx_range_till(struct sk_msg_md, remote_ip6[0], remote_ip6[3]): 9178 case bpf_ctx_range_till(struct sk_msg_md, local_ip6[0], local_ip6[3]): 9179 case bpf_ctx_range(struct sk_msg_md, remote_port): 9180 case bpf_ctx_range(struct sk_msg_md, local_port): 9181 case bpf_ctx_range(struct sk_msg_md, size): 9182 if (size != sizeof(__u32)) 9183 return false; 9184 break; 9185 default: 9186 return false; 9187 } 9188 return true; 9189 } 9190 9191 static bool flow_dissector_is_valid_access(int off, int size, 9192 enum bpf_access_type type, 9193 const struct bpf_prog *prog, 9194 struct bpf_insn_access_aux *info) 9195 { 9196 const int size_default = sizeof(__u32); 9197 9198 if (off < 0 || off >= sizeof(struct __sk_buff)) 9199 return false; 9200 9201 if (type == BPF_WRITE) 9202 return false; 9203 9204 switch (off) { 9205 case bpf_ctx_range(struct __sk_buff, data): 9206 if (size != size_default) 9207 return false; 9208 info->reg_type = PTR_TO_PACKET; 9209 return true; 9210 case bpf_ctx_range(struct __sk_buff, data_end): 9211 if (size != size_default) 9212 return false; 9213 info->reg_type = PTR_TO_PACKET_END; 9214 return true; 9215 case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): 9216 if (size != sizeof(__u64)) 9217 return false; 9218 info->reg_type = PTR_TO_FLOW_KEYS; 9219 return true; 9220 default: 9221 return false; 9222 } 9223 } 9224 9225 static u32 flow_dissector_convert_ctx_access(enum bpf_access_type type, 9226 const struct bpf_insn *si, 9227 struct bpf_insn *insn_buf, 9228 struct bpf_prog *prog, 9229 u32 *target_size) 9230 9231 { 9232 struct bpf_insn *insn = insn_buf; 9233 9234 switch (si->off) { 9235 case offsetof(struct __sk_buff, data): 9236 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data), 9237 si->dst_reg, si->src_reg, 9238 offsetof(struct bpf_flow_dissector, data)); 9239 break; 9240 9241 case offsetof(struct __sk_buff, data_end): 9242 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data_end), 9243 si->dst_reg, si->src_reg, 9244 offsetof(struct bpf_flow_dissector, data_end)); 9245 break; 9246 9247 case offsetof(struct __sk_buff, flow_keys): 9248 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, flow_keys), 9249 si->dst_reg, si->src_reg, 9250 offsetof(struct bpf_flow_dissector, flow_keys)); 9251 break; 9252 } 9253 9254 return insn - insn_buf; 9255 } 9256 9257 static struct bpf_insn *bpf_convert_tstamp_type_read(const struct bpf_insn *si, 9258 struct bpf_insn *insn) 9259 { 9260 __u8 value_reg = si->dst_reg; 9261 __u8 skb_reg = si->src_reg; 9262 /* AX is needed because src_reg and dst_reg could be the same */ 9263 __u8 tmp_reg = BPF_REG_AX; 9264 9265 *insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg, 9266 SKB_BF_MONO_TC_OFFSET); 9267 *insn++ = BPF_JMP32_IMM(BPF_JSET, tmp_reg, 9268 SKB_MONO_DELIVERY_TIME_MASK, 2); 9269 *insn++ = BPF_MOV32_IMM(value_reg, BPF_SKB_TSTAMP_UNSPEC); 9270 *insn++ = BPF_JMP_A(1); 9271 *insn++ = BPF_MOV32_IMM(value_reg, BPF_SKB_TSTAMP_DELIVERY_MONO); 9272 9273 return insn; 9274 } 9275 9276 static struct bpf_insn *bpf_convert_shinfo_access(__u8 dst_reg, __u8 skb_reg, 9277 struct bpf_insn *insn) 9278 { 9279 /* si->dst_reg = skb_shinfo(SKB); */ 9280 #ifdef NET_SKBUFF_DATA_USES_OFFSET 9281 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), 9282 BPF_REG_AX, skb_reg, 9283 offsetof(struct sk_buff, end)); 9284 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, head), 9285 dst_reg, skb_reg, 9286 offsetof(struct sk_buff, head)); 9287 *insn++ = BPF_ALU64_REG(BPF_ADD, dst_reg, BPF_REG_AX); 9288 #else 9289 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), 9290 dst_reg, skb_reg, 9291 offsetof(struct sk_buff, end)); 9292 #endif 9293 9294 return insn; 9295 } 9296 9297 static struct bpf_insn *bpf_convert_tstamp_read(const struct bpf_prog *prog, 9298 const struct bpf_insn *si, 9299 struct bpf_insn *insn) 9300 { 9301 __u8 value_reg = si->dst_reg; 9302 __u8 skb_reg = si->src_reg; 9303 9304 #ifdef CONFIG_NET_XGRESS 9305 /* If the tstamp_type is read, 9306 * the bpf prog is aware the tstamp could have delivery time. 9307 * Thus, read skb->tstamp as is if tstamp_type_access is true. 9308 */ 9309 if (!prog->tstamp_type_access) { 9310 /* AX is needed because src_reg and dst_reg could be the same */ 9311 __u8 tmp_reg = BPF_REG_AX; 9312 9313 *insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg, SKB_BF_MONO_TC_OFFSET); 9314 *insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg, 9315 TC_AT_INGRESS_MASK | SKB_MONO_DELIVERY_TIME_MASK); 9316 *insn++ = BPF_JMP32_IMM(BPF_JNE, tmp_reg, 9317 TC_AT_INGRESS_MASK | SKB_MONO_DELIVERY_TIME_MASK, 2); 9318 /* skb->tc_at_ingress && skb->mono_delivery_time, 9319 * read 0 as the (rcv) timestamp. 9320 */ 9321 *insn++ = BPF_MOV64_IMM(value_reg, 0); 9322 *insn++ = BPF_JMP_A(1); 9323 } 9324 #endif 9325 9326 *insn++ = BPF_LDX_MEM(BPF_DW, value_reg, skb_reg, 9327 offsetof(struct sk_buff, tstamp)); 9328 return insn; 9329 } 9330 9331 static struct bpf_insn *bpf_convert_tstamp_write(const struct bpf_prog *prog, 9332 const struct bpf_insn *si, 9333 struct bpf_insn *insn) 9334 { 9335 __u8 value_reg = si->src_reg; 9336 __u8 skb_reg = si->dst_reg; 9337 9338 #ifdef CONFIG_NET_XGRESS 9339 /* If the tstamp_type is read, 9340 * the bpf prog is aware the tstamp could have delivery time. 9341 * Thus, write skb->tstamp as is if tstamp_type_access is true. 9342 * Otherwise, writing at ingress will have to clear the 9343 * mono_delivery_time bit also. 9344 */ 9345 if (!prog->tstamp_type_access) { 9346 __u8 tmp_reg = BPF_REG_AX; 9347 9348 *insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg, SKB_BF_MONO_TC_OFFSET); 9349 /* Writing __sk_buff->tstamp as ingress, goto <clear> */ 9350 *insn++ = BPF_JMP32_IMM(BPF_JSET, tmp_reg, TC_AT_INGRESS_MASK, 1); 9351 /* goto <store> */ 9352 *insn++ = BPF_JMP_A(2); 9353 /* <clear>: mono_delivery_time */ 9354 *insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg, ~SKB_MONO_DELIVERY_TIME_MASK); 9355 *insn++ = BPF_STX_MEM(BPF_B, skb_reg, tmp_reg, SKB_BF_MONO_TC_OFFSET); 9356 } 9357 #endif 9358 9359 /* <store>: skb->tstamp = tstamp */ 9360 *insn++ = BPF_RAW_INSN(BPF_CLASS(si->code) | BPF_DW | BPF_MEM, 9361 skb_reg, value_reg, offsetof(struct sk_buff, tstamp), si->imm); 9362 return insn; 9363 } 9364 9365 #define BPF_EMIT_STORE(size, si, off) \ 9366 BPF_RAW_INSN(BPF_CLASS((si)->code) | (size) | BPF_MEM, \ 9367 (si)->dst_reg, (si)->src_reg, (off), (si)->imm) 9368 9369 static u32 bpf_convert_ctx_access(enum bpf_access_type type, 9370 const struct bpf_insn *si, 9371 struct bpf_insn *insn_buf, 9372 struct bpf_prog *prog, u32 *target_size) 9373 { 9374 struct bpf_insn *insn = insn_buf; 9375 int off; 9376 9377 switch (si->off) { 9378 case offsetof(struct __sk_buff, len): 9379 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9380 bpf_target_off(struct sk_buff, len, 4, 9381 target_size)); 9382 break; 9383 9384 case offsetof(struct __sk_buff, protocol): 9385 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9386 bpf_target_off(struct sk_buff, protocol, 2, 9387 target_size)); 9388 break; 9389 9390 case offsetof(struct __sk_buff, vlan_proto): 9391 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9392 bpf_target_off(struct sk_buff, vlan_proto, 2, 9393 target_size)); 9394 break; 9395 9396 case offsetof(struct __sk_buff, priority): 9397 if (type == BPF_WRITE) 9398 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9399 bpf_target_off(struct sk_buff, priority, 4, 9400 target_size)); 9401 else 9402 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9403 bpf_target_off(struct sk_buff, priority, 4, 9404 target_size)); 9405 break; 9406 9407 case offsetof(struct __sk_buff, ingress_ifindex): 9408 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9409 bpf_target_off(struct sk_buff, skb_iif, 4, 9410 target_size)); 9411 break; 9412 9413 case offsetof(struct __sk_buff, ifindex): 9414 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 9415 si->dst_reg, si->src_reg, 9416 offsetof(struct sk_buff, dev)); 9417 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 9418 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9419 bpf_target_off(struct net_device, ifindex, 4, 9420 target_size)); 9421 break; 9422 9423 case offsetof(struct __sk_buff, hash): 9424 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9425 bpf_target_off(struct sk_buff, hash, 4, 9426 target_size)); 9427 break; 9428 9429 case offsetof(struct __sk_buff, mark): 9430 if (type == BPF_WRITE) 9431 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9432 bpf_target_off(struct sk_buff, mark, 4, 9433 target_size)); 9434 else 9435 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9436 bpf_target_off(struct sk_buff, mark, 4, 9437 target_size)); 9438 break; 9439 9440 case offsetof(struct __sk_buff, pkt_type): 9441 *target_size = 1; 9442 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, 9443 PKT_TYPE_OFFSET); 9444 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX); 9445 #ifdef __BIG_ENDIAN_BITFIELD 9446 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5); 9447 #endif 9448 break; 9449 9450 case offsetof(struct __sk_buff, queue_mapping): 9451 if (type == BPF_WRITE) { 9452 u32 off = bpf_target_off(struct sk_buff, queue_mapping, 2, target_size); 9453 9454 if (BPF_CLASS(si->code) == BPF_ST && si->imm >= NO_QUEUE_MAPPING) { 9455 *insn++ = BPF_JMP_A(0); /* noop */ 9456 break; 9457 } 9458 9459 if (BPF_CLASS(si->code) == BPF_STX) 9460 *insn++ = BPF_JMP_IMM(BPF_JGE, si->src_reg, NO_QUEUE_MAPPING, 1); 9461 *insn++ = BPF_EMIT_STORE(BPF_H, si, off); 9462 } else { 9463 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9464 bpf_target_off(struct sk_buff, 9465 queue_mapping, 9466 2, target_size)); 9467 } 9468 break; 9469 9470 case offsetof(struct __sk_buff, vlan_present): 9471 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9472 bpf_target_off(struct sk_buff, 9473 vlan_all, 4, target_size)); 9474 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 9475 *insn++ = BPF_ALU32_IMM(BPF_MOV, si->dst_reg, 1); 9476 break; 9477 9478 case offsetof(struct __sk_buff, vlan_tci): 9479 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9480 bpf_target_off(struct sk_buff, vlan_tci, 2, 9481 target_size)); 9482 break; 9483 9484 case offsetof(struct __sk_buff, cb[0]) ... 9485 offsetofend(struct __sk_buff, cb[4]) - 1: 9486 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, data) < 20); 9487 BUILD_BUG_ON((offsetof(struct sk_buff, cb) + 9488 offsetof(struct qdisc_skb_cb, data)) % 9489 sizeof(__u64)); 9490 9491 prog->cb_access = 1; 9492 off = si->off; 9493 off -= offsetof(struct __sk_buff, cb[0]); 9494 off += offsetof(struct sk_buff, cb); 9495 off += offsetof(struct qdisc_skb_cb, data); 9496 if (type == BPF_WRITE) 9497 *insn++ = BPF_EMIT_STORE(BPF_SIZE(si->code), si, off); 9498 else 9499 *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg, 9500 si->src_reg, off); 9501 break; 9502 9503 case offsetof(struct __sk_buff, tc_classid): 9504 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, tc_classid) != 2); 9505 9506 off = si->off; 9507 off -= offsetof(struct __sk_buff, tc_classid); 9508 off += offsetof(struct sk_buff, cb); 9509 off += offsetof(struct qdisc_skb_cb, tc_classid); 9510 *target_size = 2; 9511 if (type == BPF_WRITE) 9512 *insn++ = BPF_EMIT_STORE(BPF_H, si, off); 9513 else 9514 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, 9515 si->src_reg, off); 9516 break; 9517 9518 case offsetof(struct __sk_buff, data): 9519 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 9520 si->dst_reg, si->src_reg, 9521 offsetof(struct sk_buff, data)); 9522 break; 9523 9524 case offsetof(struct __sk_buff, data_meta): 9525 off = si->off; 9526 off -= offsetof(struct __sk_buff, data_meta); 9527 off += offsetof(struct sk_buff, cb); 9528 off += offsetof(struct bpf_skb_data_end, data_meta); 9529 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, 9530 si->src_reg, off); 9531 break; 9532 9533 case offsetof(struct __sk_buff, data_end): 9534 off = si->off; 9535 off -= offsetof(struct __sk_buff, data_end); 9536 off += offsetof(struct sk_buff, cb); 9537 off += offsetof(struct bpf_skb_data_end, data_end); 9538 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, 9539 si->src_reg, off); 9540 break; 9541 9542 case offsetof(struct __sk_buff, tc_index): 9543 #ifdef CONFIG_NET_SCHED 9544 if (type == BPF_WRITE) 9545 *insn++ = BPF_EMIT_STORE(BPF_H, si, 9546 bpf_target_off(struct sk_buff, tc_index, 2, 9547 target_size)); 9548 else 9549 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9550 bpf_target_off(struct sk_buff, tc_index, 2, 9551 target_size)); 9552 #else 9553 *target_size = 2; 9554 if (type == BPF_WRITE) 9555 *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg); 9556 else 9557 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 9558 #endif 9559 break; 9560 9561 case offsetof(struct __sk_buff, napi_id): 9562 #if defined(CONFIG_NET_RX_BUSY_POLL) 9563 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9564 bpf_target_off(struct sk_buff, napi_id, 4, 9565 target_size)); 9566 *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1); 9567 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 9568 #else 9569 *target_size = 4; 9570 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 9571 #endif 9572 break; 9573 case offsetof(struct __sk_buff, family): 9574 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); 9575 9576 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9577 si->dst_reg, si->src_reg, 9578 offsetof(struct sk_buff, sk)); 9579 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 9580 bpf_target_off(struct sock_common, 9581 skc_family, 9582 2, target_size)); 9583 break; 9584 case offsetof(struct __sk_buff, remote_ip4): 9585 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); 9586 9587 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9588 si->dst_reg, si->src_reg, 9589 offsetof(struct sk_buff, sk)); 9590 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9591 bpf_target_off(struct sock_common, 9592 skc_daddr, 9593 4, target_size)); 9594 break; 9595 case offsetof(struct __sk_buff, local_ip4): 9596 BUILD_BUG_ON(sizeof_field(struct sock_common, 9597 skc_rcv_saddr) != 4); 9598 9599 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9600 si->dst_reg, si->src_reg, 9601 offsetof(struct sk_buff, sk)); 9602 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9603 bpf_target_off(struct sock_common, 9604 skc_rcv_saddr, 9605 4, target_size)); 9606 break; 9607 case offsetof(struct __sk_buff, remote_ip6[0]) ... 9608 offsetof(struct __sk_buff, remote_ip6[3]): 9609 #if IS_ENABLED(CONFIG_IPV6) 9610 BUILD_BUG_ON(sizeof_field(struct sock_common, 9611 skc_v6_daddr.s6_addr32[0]) != 4); 9612 9613 off = si->off; 9614 off -= offsetof(struct __sk_buff, remote_ip6[0]); 9615 9616 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9617 si->dst_reg, si->src_reg, 9618 offsetof(struct sk_buff, sk)); 9619 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9620 offsetof(struct sock_common, 9621 skc_v6_daddr.s6_addr32[0]) + 9622 off); 9623 #else 9624 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9625 #endif 9626 break; 9627 case offsetof(struct __sk_buff, local_ip6[0]) ... 9628 offsetof(struct __sk_buff, local_ip6[3]): 9629 #if IS_ENABLED(CONFIG_IPV6) 9630 BUILD_BUG_ON(sizeof_field(struct sock_common, 9631 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 9632 9633 off = si->off; 9634 off -= offsetof(struct __sk_buff, local_ip6[0]); 9635 9636 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9637 si->dst_reg, si->src_reg, 9638 offsetof(struct sk_buff, sk)); 9639 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9640 offsetof(struct sock_common, 9641 skc_v6_rcv_saddr.s6_addr32[0]) + 9642 off); 9643 #else 9644 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9645 #endif 9646 break; 9647 9648 case offsetof(struct __sk_buff, remote_port): 9649 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); 9650 9651 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9652 si->dst_reg, si->src_reg, 9653 offsetof(struct sk_buff, sk)); 9654 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 9655 bpf_target_off(struct sock_common, 9656 skc_dport, 9657 2, target_size)); 9658 #ifndef __BIG_ENDIAN_BITFIELD 9659 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 9660 #endif 9661 break; 9662 9663 case offsetof(struct __sk_buff, local_port): 9664 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); 9665 9666 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9667 si->dst_reg, si->src_reg, 9668 offsetof(struct sk_buff, sk)); 9669 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 9670 bpf_target_off(struct sock_common, 9671 skc_num, 2, target_size)); 9672 break; 9673 9674 case offsetof(struct __sk_buff, tstamp): 9675 BUILD_BUG_ON(sizeof_field(struct sk_buff, tstamp) != 8); 9676 9677 if (type == BPF_WRITE) 9678 insn = bpf_convert_tstamp_write(prog, si, insn); 9679 else 9680 insn = bpf_convert_tstamp_read(prog, si, insn); 9681 break; 9682 9683 case offsetof(struct __sk_buff, tstamp_type): 9684 insn = bpf_convert_tstamp_type_read(si, insn); 9685 break; 9686 9687 case offsetof(struct __sk_buff, gso_segs): 9688 insn = bpf_convert_shinfo_access(si->dst_reg, si->src_reg, insn); 9689 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_segs), 9690 si->dst_reg, si->dst_reg, 9691 bpf_target_off(struct skb_shared_info, 9692 gso_segs, 2, 9693 target_size)); 9694 break; 9695 case offsetof(struct __sk_buff, gso_size): 9696 insn = bpf_convert_shinfo_access(si->dst_reg, si->src_reg, insn); 9697 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_size), 9698 si->dst_reg, si->dst_reg, 9699 bpf_target_off(struct skb_shared_info, 9700 gso_size, 2, 9701 target_size)); 9702 break; 9703 case offsetof(struct __sk_buff, wire_len): 9704 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, pkt_len) != 4); 9705 9706 off = si->off; 9707 off -= offsetof(struct __sk_buff, wire_len); 9708 off += offsetof(struct sk_buff, cb); 9709 off += offsetof(struct qdisc_skb_cb, pkt_len); 9710 *target_size = 4; 9711 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, off); 9712 break; 9713 9714 case offsetof(struct __sk_buff, sk): 9715 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9716 si->dst_reg, si->src_reg, 9717 offsetof(struct sk_buff, sk)); 9718 break; 9719 case offsetof(struct __sk_buff, hwtstamp): 9720 BUILD_BUG_ON(sizeof_field(struct skb_shared_hwtstamps, hwtstamp) != 8); 9721 BUILD_BUG_ON(offsetof(struct skb_shared_hwtstamps, hwtstamp) != 0); 9722 9723 insn = bpf_convert_shinfo_access(si->dst_reg, si->src_reg, insn); 9724 *insn++ = BPF_LDX_MEM(BPF_DW, 9725 si->dst_reg, si->dst_reg, 9726 bpf_target_off(struct skb_shared_info, 9727 hwtstamps, 8, 9728 target_size)); 9729 break; 9730 } 9731 9732 return insn - insn_buf; 9733 } 9734 9735 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 9736 const struct bpf_insn *si, 9737 struct bpf_insn *insn_buf, 9738 struct bpf_prog *prog, u32 *target_size) 9739 { 9740 struct bpf_insn *insn = insn_buf; 9741 int off; 9742 9743 switch (si->off) { 9744 case offsetof(struct bpf_sock, bound_dev_if): 9745 BUILD_BUG_ON(sizeof_field(struct sock, sk_bound_dev_if) != 4); 9746 9747 if (type == BPF_WRITE) 9748 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9749 offsetof(struct sock, sk_bound_dev_if)); 9750 else 9751 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9752 offsetof(struct sock, sk_bound_dev_if)); 9753 break; 9754 9755 case offsetof(struct bpf_sock, mark): 9756 BUILD_BUG_ON(sizeof_field(struct sock, sk_mark) != 4); 9757 9758 if (type == BPF_WRITE) 9759 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9760 offsetof(struct sock, sk_mark)); 9761 else 9762 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9763 offsetof(struct sock, sk_mark)); 9764 break; 9765 9766 case offsetof(struct bpf_sock, priority): 9767 BUILD_BUG_ON(sizeof_field(struct sock, sk_priority) != 4); 9768 9769 if (type == BPF_WRITE) 9770 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9771 offsetof(struct sock, sk_priority)); 9772 else 9773 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9774 offsetof(struct sock, sk_priority)); 9775 break; 9776 9777 case offsetof(struct bpf_sock, family): 9778 *insn++ = BPF_LDX_MEM( 9779 BPF_FIELD_SIZEOF(struct sock_common, skc_family), 9780 si->dst_reg, si->src_reg, 9781 bpf_target_off(struct sock_common, 9782 skc_family, 9783 sizeof_field(struct sock_common, 9784 skc_family), 9785 target_size)); 9786 break; 9787 9788 case offsetof(struct bpf_sock, type): 9789 *insn++ = BPF_LDX_MEM( 9790 BPF_FIELD_SIZEOF(struct sock, sk_type), 9791 si->dst_reg, si->src_reg, 9792 bpf_target_off(struct sock, sk_type, 9793 sizeof_field(struct sock, sk_type), 9794 target_size)); 9795 break; 9796 9797 case offsetof(struct bpf_sock, protocol): 9798 *insn++ = BPF_LDX_MEM( 9799 BPF_FIELD_SIZEOF(struct sock, sk_protocol), 9800 si->dst_reg, si->src_reg, 9801 bpf_target_off(struct sock, sk_protocol, 9802 sizeof_field(struct sock, sk_protocol), 9803 target_size)); 9804 break; 9805 9806 case offsetof(struct bpf_sock, src_ip4): 9807 *insn++ = BPF_LDX_MEM( 9808 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 9809 bpf_target_off(struct sock_common, skc_rcv_saddr, 9810 sizeof_field(struct sock_common, 9811 skc_rcv_saddr), 9812 target_size)); 9813 break; 9814 9815 case offsetof(struct bpf_sock, dst_ip4): 9816 *insn++ = BPF_LDX_MEM( 9817 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 9818 bpf_target_off(struct sock_common, skc_daddr, 9819 sizeof_field(struct sock_common, 9820 skc_daddr), 9821 target_size)); 9822 break; 9823 9824 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 9825 #if IS_ENABLED(CONFIG_IPV6) 9826 off = si->off; 9827 off -= offsetof(struct bpf_sock, src_ip6[0]); 9828 *insn++ = BPF_LDX_MEM( 9829 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 9830 bpf_target_off( 9831 struct sock_common, 9832 skc_v6_rcv_saddr.s6_addr32[0], 9833 sizeof_field(struct sock_common, 9834 skc_v6_rcv_saddr.s6_addr32[0]), 9835 target_size) + off); 9836 #else 9837 (void)off; 9838 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9839 #endif 9840 break; 9841 9842 case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): 9843 #if IS_ENABLED(CONFIG_IPV6) 9844 off = si->off; 9845 off -= offsetof(struct bpf_sock, dst_ip6[0]); 9846 *insn++ = BPF_LDX_MEM( 9847 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 9848 bpf_target_off(struct sock_common, 9849 skc_v6_daddr.s6_addr32[0], 9850 sizeof_field(struct sock_common, 9851 skc_v6_daddr.s6_addr32[0]), 9852 target_size) + off); 9853 #else 9854 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9855 *target_size = 4; 9856 #endif 9857 break; 9858 9859 case offsetof(struct bpf_sock, src_port): 9860 *insn++ = BPF_LDX_MEM( 9861 BPF_FIELD_SIZEOF(struct sock_common, skc_num), 9862 si->dst_reg, si->src_reg, 9863 bpf_target_off(struct sock_common, skc_num, 9864 sizeof_field(struct sock_common, 9865 skc_num), 9866 target_size)); 9867 break; 9868 9869 case offsetof(struct bpf_sock, dst_port): 9870 *insn++ = BPF_LDX_MEM( 9871 BPF_FIELD_SIZEOF(struct sock_common, skc_dport), 9872 si->dst_reg, si->src_reg, 9873 bpf_target_off(struct sock_common, skc_dport, 9874 sizeof_field(struct sock_common, 9875 skc_dport), 9876 target_size)); 9877 break; 9878 9879 case offsetof(struct bpf_sock, state): 9880 *insn++ = BPF_LDX_MEM( 9881 BPF_FIELD_SIZEOF(struct sock_common, skc_state), 9882 si->dst_reg, si->src_reg, 9883 bpf_target_off(struct sock_common, skc_state, 9884 sizeof_field(struct sock_common, 9885 skc_state), 9886 target_size)); 9887 break; 9888 case offsetof(struct bpf_sock, rx_queue_mapping): 9889 #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING 9890 *insn++ = BPF_LDX_MEM( 9891 BPF_FIELD_SIZEOF(struct sock, sk_rx_queue_mapping), 9892 si->dst_reg, si->src_reg, 9893 bpf_target_off(struct sock, sk_rx_queue_mapping, 9894 sizeof_field(struct sock, 9895 sk_rx_queue_mapping), 9896 target_size)); 9897 *insn++ = BPF_JMP_IMM(BPF_JNE, si->dst_reg, NO_QUEUE_MAPPING, 9898 1); 9899 *insn++ = BPF_MOV64_IMM(si->dst_reg, -1); 9900 #else 9901 *insn++ = BPF_MOV64_IMM(si->dst_reg, -1); 9902 *target_size = 2; 9903 #endif 9904 break; 9905 } 9906 9907 return insn - insn_buf; 9908 } 9909 9910 static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type, 9911 const struct bpf_insn *si, 9912 struct bpf_insn *insn_buf, 9913 struct bpf_prog *prog, u32 *target_size) 9914 { 9915 struct bpf_insn *insn = insn_buf; 9916 9917 switch (si->off) { 9918 case offsetof(struct __sk_buff, ifindex): 9919 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 9920 si->dst_reg, si->src_reg, 9921 offsetof(struct sk_buff, dev)); 9922 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9923 bpf_target_off(struct net_device, ifindex, 4, 9924 target_size)); 9925 break; 9926 default: 9927 return bpf_convert_ctx_access(type, si, insn_buf, prog, 9928 target_size); 9929 } 9930 9931 return insn - insn_buf; 9932 } 9933 9934 static u32 xdp_convert_ctx_access(enum bpf_access_type type, 9935 const struct bpf_insn *si, 9936 struct bpf_insn *insn_buf, 9937 struct bpf_prog *prog, u32 *target_size) 9938 { 9939 struct bpf_insn *insn = insn_buf; 9940 9941 switch (si->off) { 9942 case offsetof(struct xdp_md, data): 9943 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data), 9944 si->dst_reg, si->src_reg, 9945 offsetof(struct xdp_buff, data)); 9946 break; 9947 case offsetof(struct xdp_md, data_meta): 9948 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta), 9949 si->dst_reg, si->src_reg, 9950 offsetof(struct xdp_buff, data_meta)); 9951 break; 9952 case offsetof(struct xdp_md, data_end): 9953 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end), 9954 si->dst_reg, si->src_reg, 9955 offsetof(struct xdp_buff, data_end)); 9956 break; 9957 case offsetof(struct xdp_md, ingress_ifindex): 9958 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), 9959 si->dst_reg, si->src_reg, 9960 offsetof(struct xdp_buff, rxq)); 9961 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev), 9962 si->dst_reg, si->dst_reg, 9963 offsetof(struct xdp_rxq_info, dev)); 9964 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9965 offsetof(struct net_device, ifindex)); 9966 break; 9967 case offsetof(struct xdp_md, rx_queue_index): 9968 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), 9969 si->dst_reg, si->src_reg, 9970 offsetof(struct xdp_buff, rxq)); 9971 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9972 offsetof(struct xdp_rxq_info, 9973 queue_index)); 9974 break; 9975 case offsetof(struct xdp_md, egress_ifindex): 9976 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, txq), 9977 si->dst_reg, si->src_reg, 9978 offsetof(struct xdp_buff, txq)); 9979 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_txq_info, dev), 9980 si->dst_reg, si->dst_reg, 9981 offsetof(struct xdp_txq_info, dev)); 9982 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9983 offsetof(struct net_device, ifindex)); 9984 break; 9985 } 9986 9987 return insn - insn_buf; 9988 } 9989 9990 /* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of 9991 * context Structure, F is Field in context structure that contains a pointer 9992 * to Nested Structure of type NS that has the field NF. 9993 * 9994 * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make 9995 * sure that SIZE is not greater than actual size of S.F.NF. 9996 * 9997 * If offset OFF is provided, the load happens from that offset relative to 9998 * offset of NF. 9999 */ 10000 #define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF) \ 10001 do { \ 10002 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg, \ 10003 si->src_reg, offsetof(S, F)); \ 10004 *insn++ = BPF_LDX_MEM( \ 10005 SIZE, si->dst_reg, si->dst_reg, \ 10006 bpf_target_off(NS, NF, sizeof_field(NS, NF), \ 10007 target_size) \ 10008 + OFF); \ 10009 } while (0) 10010 10011 #define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF) \ 10012 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, \ 10013 BPF_FIELD_SIZEOF(NS, NF), 0) 10014 10015 /* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to 10016 * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation. 10017 * 10018 * In addition it uses Temporary Field TF (member of struct S) as the 3rd 10019 * "register" since two registers available in convert_ctx_access are not 10020 * enough: we can't override neither SRC, since it contains value to store, nor 10021 * DST since it contains pointer to context that may be used by later 10022 * instructions. But we need a temporary place to save pointer to nested 10023 * structure whose field we want to store to. 10024 */ 10025 #define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, OFF, TF) \ 10026 do { \ 10027 int tmp_reg = BPF_REG_9; \ 10028 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ 10029 --tmp_reg; \ 10030 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ 10031 --tmp_reg; \ 10032 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg, \ 10033 offsetof(S, TF)); \ 10034 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg, \ 10035 si->dst_reg, offsetof(S, F)); \ 10036 *insn++ = BPF_RAW_INSN(SIZE | BPF_MEM | BPF_CLASS(si->code), \ 10037 tmp_reg, si->src_reg, \ 10038 bpf_target_off(NS, NF, sizeof_field(NS, NF), \ 10039 target_size) \ 10040 + OFF, \ 10041 si->imm); \ 10042 *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg, \ 10043 offsetof(S, TF)); \ 10044 } while (0) 10045 10046 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \ 10047 TF) \ 10048 do { \ 10049 if (type == BPF_WRITE) { \ 10050 SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, \ 10051 OFF, TF); \ 10052 } else { \ 10053 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( \ 10054 S, NS, F, NF, SIZE, OFF); \ 10055 } \ 10056 } while (0) 10057 10058 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF) \ 10059 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( \ 10060 S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF) 10061 10062 static u32 sock_addr_convert_ctx_access(enum bpf_access_type type, 10063 const struct bpf_insn *si, 10064 struct bpf_insn *insn_buf, 10065 struct bpf_prog *prog, u32 *target_size) 10066 { 10067 int off, port_size = sizeof_field(struct sockaddr_in6, sin6_port); 10068 struct bpf_insn *insn = insn_buf; 10069 10070 switch (si->off) { 10071 case offsetof(struct bpf_sock_addr, user_family): 10072 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 10073 struct sockaddr, uaddr, sa_family); 10074 break; 10075 10076 case offsetof(struct bpf_sock_addr, user_ip4): 10077 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10078 struct bpf_sock_addr_kern, struct sockaddr_in, uaddr, 10079 sin_addr, BPF_SIZE(si->code), 0, tmp_reg); 10080 break; 10081 10082 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 10083 off = si->off; 10084 off -= offsetof(struct bpf_sock_addr, user_ip6[0]); 10085 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10086 struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr, 10087 sin6_addr.s6_addr32[0], BPF_SIZE(si->code), off, 10088 tmp_reg); 10089 break; 10090 10091 case offsetof(struct bpf_sock_addr, user_port): 10092 /* To get port we need to know sa_family first and then treat 10093 * sockaddr as either sockaddr_in or sockaddr_in6. 10094 * Though we can simplify since port field has same offset and 10095 * size in both structures. 10096 * Here we check this invariant and use just one of the 10097 * structures if it's true. 10098 */ 10099 BUILD_BUG_ON(offsetof(struct sockaddr_in, sin_port) != 10100 offsetof(struct sockaddr_in6, sin6_port)); 10101 BUILD_BUG_ON(sizeof_field(struct sockaddr_in, sin_port) != 10102 sizeof_field(struct sockaddr_in6, sin6_port)); 10103 /* Account for sin6_port being smaller than user_port. */ 10104 port_size = min(port_size, BPF_LDST_BYTES(si)); 10105 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10106 struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr, 10107 sin6_port, bytes_to_bpf_size(port_size), 0, tmp_reg); 10108 break; 10109 10110 case offsetof(struct bpf_sock_addr, family): 10111 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 10112 struct sock, sk, sk_family); 10113 break; 10114 10115 case offsetof(struct bpf_sock_addr, type): 10116 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 10117 struct sock, sk, sk_type); 10118 break; 10119 10120 case offsetof(struct bpf_sock_addr, protocol): 10121 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 10122 struct sock, sk, sk_protocol); 10123 break; 10124 10125 case offsetof(struct bpf_sock_addr, msg_src_ip4): 10126 /* Treat t_ctx as struct in_addr for msg_src_ip4. */ 10127 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10128 struct bpf_sock_addr_kern, struct in_addr, t_ctx, 10129 s_addr, BPF_SIZE(si->code), 0, tmp_reg); 10130 break; 10131 10132 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 10133 msg_src_ip6[3]): 10134 off = si->off; 10135 off -= offsetof(struct bpf_sock_addr, msg_src_ip6[0]); 10136 /* Treat t_ctx as struct in6_addr for msg_src_ip6. */ 10137 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10138 struct bpf_sock_addr_kern, struct in6_addr, t_ctx, 10139 s6_addr32[0], BPF_SIZE(si->code), off, tmp_reg); 10140 break; 10141 case offsetof(struct bpf_sock_addr, sk): 10142 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_addr_kern, sk), 10143 si->dst_reg, si->src_reg, 10144 offsetof(struct bpf_sock_addr_kern, sk)); 10145 break; 10146 } 10147 10148 return insn - insn_buf; 10149 } 10150 10151 static u32 sock_ops_convert_ctx_access(enum bpf_access_type type, 10152 const struct bpf_insn *si, 10153 struct bpf_insn *insn_buf, 10154 struct bpf_prog *prog, 10155 u32 *target_size) 10156 { 10157 struct bpf_insn *insn = insn_buf; 10158 int off; 10159 10160 /* Helper macro for adding read access to tcp_sock or sock fields. */ 10161 #define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ 10162 do { \ 10163 int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 2; \ 10164 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \ 10165 sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \ 10166 if (si->dst_reg == reg || si->src_reg == reg) \ 10167 reg--; \ 10168 if (si->dst_reg == reg || si->src_reg == reg) \ 10169 reg--; \ 10170 if (si->dst_reg == si->src_reg) { \ 10171 *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, \ 10172 offsetof(struct bpf_sock_ops_kern, \ 10173 temp)); \ 10174 fullsock_reg = reg; \ 10175 jmp += 2; \ 10176 } \ 10177 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10178 struct bpf_sock_ops_kern, \ 10179 is_fullsock), \ 10180 fullsock_reg, si->src_reg, \ 10181 offsetof(struct bpf_sock_ops_kern, \ 10182 is_fullsock)); \ 10183 *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp); \ 10184 if (si->dst_reg == si->src_reg) \ 10185 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 10186 offsetof(struct bpf_sock_ops_kern, \ 10187 temp)); \ 10188 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10189 struct bpf_sock_ops_kern, sk),\ 10190 si->dst_reg, si->src_reg, \ 10191 offsetof(struct bpf_sock_ops_kern, sk));\ 10192 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ, \ 10193 OBJ_FIELD), \ 10194 si->dst_reg, si->dst_reg, \ 10195 offsetof(OBJ, OBJ_FIELD)); \ 10196 if (si->dst_reg == si->src_reg) { \ 10197 *insn++ = BPF_JMP_A(1); \ 10198 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 10199 offsetof(struct bpf_sock_ops_kern, \ 10200 temp)); \ 10201 } \ 10202 } while (0) 10203 10204 #define SOCK_OPS_GET_SK() \ 10205 do { \ 10206 int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 1; \ 10207 if (si->dst_reg == reg || si->src_reg == reg) \ 10208 reg--; \ 10209 if (si->dst_reg == reg || si->src_reg == reg) \ 10210 reg--; \ 10211 if (si->dst_reg == si->src_reg) { \ 10212 *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, \ 10213 offsetof(struct bpf_sock_ops_kern, \ 10214 temp)); \ 10215 fullsock_reg = reg; \ 10216 jmp += 2; \ 10217 } \ 10218 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10219 struct bpf_sock_ops_kern, \ 10220 is_fullsock), \ 10221 fullsock_reg, si->src_reg, \ 10222 offsetof(struct bpf_sock_ops_kern, \ 10223 is_fullsock)); \ 10224 *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp); \ 10225 if (si->dst_reg == si->src_reg) \ 10226 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 10227 offsetof(struct bpf_sock_ops_kern, \ 10228 temp)); \ 10229 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10230 struct bpf_sock_ops_kern, sk),\ 10231 si->dst_reg, si->src_reg, \ 10232 offsetof(struct bpf_sock_ops_kern, sk));\ 10233 if (si->dst_reg == si->src_reg) { \ 10234 *insn++ = BPF_JMP_A(1); \ 10235 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 10236 offsetof(struct bpf_sock_ops_kern, \ 10237 temp)); \ 10238 } \ 10239 } while (0) 10240 10241 #define SOCK_OPS_GET_TCP_SOCK_FIELD(FIELD) \ 10242 SOCK_OPS_GET_FIELD(FIELD, FIELD, struct tcp_sock) 10243 10244 /* Helper macro for adding write access to tcp_sock or sock fields. 10245 * The macro is called with two registers, dst_reg which contains a pointer 10246 * to ctx (context) and src_reg which contains the value that should be 10247 * stored. However, we need an additional register since we cannot overwrite 10248 * dst_reg because it may be used later in the program. 10249 * Instead we "borrow" one of the other register. We first save its value 10250 * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore 10251 * it at the end of the macro. 10252 */ 10253 #define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ 10254 do { \ 10255 int reg = BPF_REG_9; \ 10256 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \ 10257 sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \ 10258 if (si->dst_reg == reg || si->src_reg == reg) \ 10259 reg--; \ 10260 if (si->dst_reg == reg || si->src_reg == reg) \ 10261 reg--; \ 10262 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg, \ 10263 offsetof(struct bpf_sock_ops_kern, \ 10264 temp)); \ 10265 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10266 struct bpf_sock_ops_kern, \ 10267 is_fullsock), \ 10268 reg, si->dst_reg, \ 10269 offsetof(struct bpf_sock_ops_kern, \ 10270 is_fullsock)); \ 10271 *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2); \ 10272 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10273 struct bpf_sock_ops_kern, sk),\ 10274 reg, si->dst_reg, \ 10275 offsetof(struct bpf_sock_ops_kern, sk));\ 10276 *insn++ = BPF_RAW_INSN(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD) | \ 10277 BPF_MEM | BPF_CLASS(si->code), \ 10278 reg, si->src_reg, \ 10279 offsetof(OBJ, OBJ_FIELD), \ 10280 si->imm); \ 10281 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg, \ 10282 offsetof(struct bpf_sock_ops_kern, \ 10283 temp)); \ 10284 } while (0) 10285 10286 #define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE) \ 10287 do { \ 10288 if (TYPE == BPF_WRITE) \ 10289 SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ 10290 else \ 10291 SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ 10292 } while (0) 10293 10294 switch (si->off) { 10295 case offsetof(struct bpf_sock_ops, op): 10296 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10297 op), 10298 si->dst_reg, si->src_reg, 10299 offsetof(struct bpf_sock_ops_kern, op)); 10300 break; 10301 10302 case offsetof(struct bpf_sock_ops, replylong[0]) ... 10303 offsetof(struct bpf_sock_ops, replylong[3]): 10304 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, reply) != 10305 sizeof_field(struct bpf_sock_ops_kern, reply)); 10306 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, replylong) != 10307 sizeof_field(struct bpf_sock_ops_kern, replylong)); 10308 off = si->off; 10309 off -= offsetof(struct bpf_sock_ops, replylong[0]); 10310 off += offsetof(struct bpf_sock_ops_kern, replylong[0]); 10311 if (type == BPF_WRITE) 10312 *insn++ = BPF_EMIT_STORE(BPF_W, si, off); 10313 else 10314 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 10315 off); 10316 break; 10317 10318 case offsetof(struct bpf_sock_ops, family): 10319 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); 10320 10321 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10322 struct bpf_sock_ops_kern, sk), 10323 si->dst_reg, si->src_reg, 10324 offsetof(struct bpf_sock_ops_kern, sk)); 10325 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10326 offsetof(struct sock_common, skc_family)); 10327 break; 10328 10329 case offsetof(struct bpf_sock_ops, remote_ip4): 10330 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); 10331 10332 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10333 struct bpf_sock_ops_kern, sk), 10334 si->dst_reg, si->src_reg, 10335 offsetof(struct bpf_sock_ops_kern, sk)); 10336 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10337 offsetof(struct sock_common, skc_daddr)); 10338 break; 10339 10340 case offsetof(struct bpf_sock_ops, local_ip4): 10341 BUILD_BUG_ON(sizeof_field(struct sock_common, 10342 skc_rcv_saddr) != 4); 10343 10344 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10345 struct bpf_sock_ops_kern, sk), 10346 si->dst_reg, si->src_reg, 10347 offsetof(struct bpf_sock_ops_kern, sk)); 10348 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10349 offsetof(struct sock_common, 10350 skc_rcv_saddr)); 10351 break; 10352 10353 case offsetof(struct bpf_sock_ops, remote_ip6[0]) ... 10354 offsetof(struct bpf_sock_ops, remote_ip6[3]): 10355 #if IS_ENABLED(CONFIG_IPV6) 10356 BUILD_BUG_ON(sizeof_field(struct sock_common, 10357 skc_v6_daddr.s6_addr32[0]) != 4); 10358 10359 off = si->off; 10360 off -= offsetof(struct bpf_sock_ops, remote_ip6[0]); 10361 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10362 struct bpf_sock_ops_kern, sk), 10363 si->dst_reg, si->src_reg, 10364 offsetof(struct bpf_sock_ops_kern, sk)); 10365 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10366 offsetof(struct sock_common, 10367 skc_v6_daddr.s6_addr32[0]) + 10368 off); 10369 #else 10370 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 10371 #endif 10372 break; 10373 10374 case offsetof(struct bpf_sock_ops, local_ip6[0]) ... 10375 offsetof(struct bpf_sock_ops, local_ip6[3]): 10376 #if IS_ENABLED(CONFIG_IPV6) 10377 BUILD_BUG_ON(sizeof_field(struct sock_common, 10378 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 10379 10380 off = si->off; 10381 off -= offsetof(struct bpf_sock_ops, local_ip6[0]); 10382 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10383 struct bpf_sock_ops_kern, sk), 10384 si->dst_reg, si->src_reg, 10385 offsetof(struct bpf_sock_ops_kern, sk)); 10386 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10387 offsetof(struct sock_common, 10388 skc_v6_rcv_saddr.s6_addr32[0]) + 10389 off); 10390 #else 10391 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 10392 #endif 10393 break; 10394 10395 case offsetof(struct bpf_sock_ops, remote_port): 10396 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); 10397 10398 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10399 struct bpf_sock_ops_kern, sk), 10400 si->dst_reg, si->src_reg, 10401 offsetof(struct bpf_sock_ops_kern, sk)); 10402 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10403 offsetof(struct sock_common, skc_dport)); 10404 #ifndef __BIG_ENDIAN_BITFIELD 10405 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 10406 #endif 10407 break; 10408 10409 case offsetof(struct bpf_sock_ops, local_port): 10410 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); 10411 10412 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10413 struct bpf_sock_ops_kern, sk), 10414 si->dst_reg, si->src_reg, 10415 offsetof(struct bpf_sock_ops_kern, sk)); 10416 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10417 offsetof(struct sock_common, skc_num)); 10418 break; 10419 10420 case offsetof(struct bpf_sock_ops, is_fullsock): 10421 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10422 struct bpf_sock_ops_kern, 10423 is_fullsock), 10424 si->dst_reg, si->src_reg, 10425 offsetof(struct bpf_sock_ops_kern, 10426 is_fullsock)); 10427 break; 10428 10429 case offsetof(struct bpf_sock_ops, state): 10430 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_state) != 1); 10431 10432 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10433 struct bpf_sock_ops_kern, sk), 10434 si->dst_reg, si->src_reg, 10435 offsetof(struct bpf_sock_ops_kern, sk)); 10436 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg, 10437 offsetof(struct sock_common, skc_state)); 10438 break; 10439 10440 case offsetof(struct bpf_sock_ops, rtt_min): 10441 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) != 10442 sizeof(struct minmax)); 10443 BUILD_BUG_ON(sizeof(struct minmax) < 10444 sizeof(struct minmax_sample)); 10445 10446 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10447 struct bpf_sock_ops_kern, sk), 10448 si->dst_reg, si->src_reg, 10449 offsetof(struct bpf_sock_ops_kern, sk)); 10450 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10451 offsetof(struct tcp_sock, rtt_min) + 10452 sizeof_field(struct minmax_sample, t)); 10453 break; 10454 10455 case offsetof(struct bpf_sock_ops, bpf_sock_ops_cb_flags): 10456 SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags, 10457 struct tcp_sock); 10458 break; 10459 10460 case offsetof(struct bpf_sock_ops, sk_txhash): 10461 SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash, 10462 struct sock, type); 10463 break; 10464 case offsetof(struct bpf_sock_ops, snd_cwnd): 10465 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_cwnd); 10466 break; 10467 case offsetof(struct bpf_sock_ops, srtt_us): 10468 SOCK_OPS_GET_TCP_SOCK_FIELD(srtt_us); 10469 break; 10470 case offsetof(struct bpf_sock_ops, snd_ssthresh): 10471 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_ssthresh); 10472 break; 10473 case offsetof(struct bpf_sock_ops, rcv_nxt): 10474 SOCK_OPS_GET_TCP_SOCK_FIELD(rcv_nxt); 10475 break; 10476 case offsetof(struct bpf_sock_ops, snd_nxt): 10477 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_nxt); 10478 break; 10479 case offsetof(struct bpf_sock_ops, snd_una): 10480 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_una); 10481 break; 10482 case offsetof(struct bpf_sock_ops, mss_cache): 10483 SOCK_OPS_GET_TCP_SOCK_FIELD(mss_cache); 10484 break; 10485 case offsetof(struct bpf_sock_ops, ecn_flags): 10486 SOCK_OPS_GET_TCP_SOCK_FIELD(ecn_flags); 10487 break; 10488 case offsetof(struct bpf_sock_ops, rate_delivered): 10489 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_delivered); 10490 break; 10491 case offsetof(struct bpf_sock_ops, rate_interval_us): 10492 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_interval_us); 10493 break; 10494 case offsetof(struct bpf_sock_ops, packets_out): 10495 SOCK_OPS_GET_TCP_SOCK_FIELD(packets_out); 10496 break; 10497 case offsetof(struct bpf_sock_ops, retrans_out): 10498 SOCK_OPS_GET_TCP_SOCK_FIELD(retrans_out); 10499 break; 10500 case offsetof(struct bpf_sock_ops, total_retrans): 10501 SOCK_OPS_GET_TCP_SOCK_FIELD(total_retrans); 10502 break; 10503 case offsetof(struct bpf_sock_ops, segs_in): 10504 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_in); 10505 break; 10506 case offsetof(struct bpf_sock_ops, data_segs_in): 10507 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_in); 10508 break; 10509 case offsetof(struct bpf_sock_ops, segs_out): 10510 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_out); 10511 break; 10512 case offsetof(struct bpf_sock_ops, data_segs_out): 10513 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_out); 10514 break; 10515 case offsetof(struct bpf_sock_ops, lost_out): 10516 SOCK_OPS_GET_TCP_SOCK_FIELD(lost_out); 10517 break; 10518 case offsetof(struct bpf_sock_ops, sacked_out): 10519 SOCK_OPS_GET_TCP_SOCK_FIELD(sacked_out); 10520 break; 10521 case offsetof(struct bpf_sock_ops, bytes_received): 10522 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_received); 10523 break; 10524 case offsetof(struct bpf_sock_ops, bytes_acked): 10525 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_acked); 10526 break; 10527 case offsetof(struct bpf_sock_ops, sk): 10528 SOCK_OPS_GET_SK(); 10529 break; 10530 case offsetof(struct bpf_sock_ops, skb_data_end): 10531 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10532 skb_data_end), 10533 si->dst_reg, si->src_reg, 10534 offsetof(struct bpf_sock_ops_kern, 10535 skb_data_end)); 10536 break; 10537 case offsetof(struct bpf_sock_ops, skb_data): 10538 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10539 skb), 10540 si->dst_reg, si->src_reg, 10541 offsetof(struct bpf_sock_ops_kern, 10542 skb)); 10543 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 10544 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 10545 si->dst_reg, si->dst_reg, 10546 offsetof(struct sk_buff, data)); 10547 break; 10548 case offsetof(struct bpf_sock_ops, skb_len): 10549 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10550 skb), 10551 si->dst_reg, si->src_reg, 10552 offsetof(struct bpf_sock_ops_kern, 10553 skb)); 10554 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 10555 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, len), 10556 si->dst_reg, si->dst_reg, 10557 offsetof(struct sk_buff, len)); 10558 break; 10559 case offsetof(struct bpf_sock_ops, skb_tcp_flags): 10560 off = offsetof(struct sk_buff, cb); 10561 off += offsetof(struct tcp_skb_cb, tcp_flags); 10562 *target_size = sizeof_field(struct tcp_skb_cb, tcp_flags); 10563 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10564 skb), 10565 si->dst_reg, si->src_reg, 10566 offsetof(struct bpf_sock_ops_kern, 10567 skb)); 10568 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 10569 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_skb_cb, 10570 tcp_flags), 10571 si->dst_reg, si->dst_reg, off); 10572 break; 10573 case offsetof(struct bpf_sock_ops, skb_hwtstamp): { 10574 struct bpf_insn *jmp_on_null_skb; 10575 10576 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10577 skb), 10578 si->dst_reg, si->src_reg, 10579 offsetof(struct bpf_sock_ops_kern, 10580 skb)); 10581 /* Reserve one insn to test skb == NULL */ 10582 jmp_on_null_skb = insn++; 10583 insn = bpf_convert_shinfo_access(si->dst_reg, si->dst_reg, insn); 10584 *insn++ = BPF_LDX_MEM(BPF_DW, si->dst_reg, si->dst_reg, 10585 bpf_target_off(struct skb_shared_info, 10586 hwtstamps, 8, 10587 target_size)); 10588 *jmp_on_null_skb = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 10589 insn - jmp_on_null_skb - 1); 10590 break; 10591 } 10592 } 10593 return insn - insn_buf; 10594 } 10595 10596 /* data_end = skb->data + skb_headlen() */ 10597 static struct bpf_insn *bpf_convert_data_end_access(const struct bpf_insn *si, 10598 struct bpf_insn *insn) 10599 { 10600 int reg; 10601 int temp_reg_off = offsetof(struct sk_buff, cb) + 10602 offsetof(struct sk_skb_cb, temp_reg); 10603 10604 if (si->src_reg == si->dst_reg) { 10605 /* We need an extra register, choose and save a register. */ 10606 reg = BPF_REG_9; 10607 if (si->src_reg == reg || si->dst_reg == reg) 10608 reg--; 10609 if (si->src_reg == reg || si->dst_reg == reg) 10610 reg--; 10611 *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, temp_reg_off); 10612 } else { 10613 reg = si->dst_reg; 10614 } 10615 10616 /* reg = skb->data */ 10617 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 10618 reg, si->src_reg, 10619 offsetof(struct sk_buff, data)); 10620 /* AX = skb->len */ 10621 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, len), 10622 BPF_REG_AX, si->src_reg, 10623 offsetof(struct sk_buff, len)); 10624 /* reg = skb->data + skb->len */ 10625 *insn++ = BPF_ALU64_REG(BPF_ADD, reg, BPF_REG_AX); 10626 /* AX = skb->data_len */ 10627 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data_len), 10628 BPF_REG_AX, si->src_reg, 10629 offsetof(struct sk_buff, data_len)); 10630 10631 /* reg = skb->data + skb->len - skb->data_len */ 10632 *insn++ = BPF_ALU64_REG(BPF_SUB, reg, BPF_REG_AX); 10633 10634 if (si->src_reg == si->dst_reg) { 10635 /* Restore the saved register */ 10636 *insn++ = BPF_MOV64_REG(BPF_REG_AX, si->src_reg); 10637 *insn++ = BPF_MOV64_REG(si->dst_reg, reg); 10638 *insn++ = BPF_LDX_MEM(BPF_DW, reg, BPF_REG_AX, temp_reg_off); 10639 } 10640 10641 return insn; 10642 } 10643 10644 static u32 sk_skb_convert_ctx_access(enum bpf_access_type type, 10645 const struct bpf_insn *si, 10646 struct bpf_insn *insn_buf, 10647 struct bpf_prog *prog, u32 *target_size) 10648 { 10649 struct bpf_insn *insn = insn_buf; 10650 int off; 10651 10652 switch (si->off) { 10653 case offsetof(struct __sk_buff, data_end): 10654 insn = bpf_convert_data_end_access(si, insn); 10655 break; 10656 case offsetof(struct __sk_buff, cb[0]) ... 10657 offsetofend(struct __sk_buff, cb[4]) - 1: 10658 BUILD_BUG_ON(sizeof_field(struct sk_skb_cb, data) < 20); 10659 BUILD_BUG_ON((offsetof(struct sk_buff, cb) + 10660 offsetof(struct sk_skb_cb, data)) % 10661 sizeof(__u64)); 10662 10663 prog->cb_access = 1; 10664 off = si->off; 10665 off -= offsetof(struct __sk_buff, cb[0]); 10666 off += offsetof(struct sk_buff, cb); 10667 off += offsetof(struct sk_skb_cb, data); 10668 if (type == BPF_WRITE) 10669 *insn++ = BPF_EMIT_STORE(BPF_SIZE(si->code), si, off); 10670 else 10671 *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg, 10672 si->src_reg, off); 10673 break; 10674 10675 10676 default: 10677 return bpf_convert_ctx_access(type, si, insn_buf, prog, 10678 target_size); 10679 } 10680 10681 return insn - insn_buf; 10682 } 10683 10684 static u32 sk_msg_convert_ctx_access(enum bpf_access_type type, 10685 const struct bpf_insn *si, 10686 struct bpf_insn *insn_buf, 10687 struct bpf_prog *prog, u32 *target_size) 10688 { 10689 struct bpf_insn *insn = insn_buf; 10690 #if IS_ENABLED(CONFIG_IPV6) 10691 int off; 10692 #endif 10693 10694 /* convert ctx uses the fact sg element is first in struct */ 10695 BUILD_BUG_ON(offsetof(struct sk_msg, sg) != 0); 10696 10697 switch (si->off) { 10698 case offsetof(struct sk_msg_md, data): 10699 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data), 10700 si->dst_reg, si->src_reg, 10701 offsetof(struct sk_msg, data)); 10702 break; 10703 case offsetof(struct sk_msg_md, data_end): 10704 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data_end), 10705 si->dst_reg, si->src_reg, 10706 offsetof(struct sk_msg, data_end)); 10707 break; 10708 case offsetof(struct sk_msg_md, family): 10709 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); 10710 10711 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10712 struct sk_msg, sk), 10713 si->dst_reg, si->src_reg, 10714 offsetof(struct sk_msg, sk)); 10715 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10716 offsetof(struct sock_common, skc_family)); 10717 break; 10718 10719 case offsetof(struct sk_msg_md, remote_ip4): 10720 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); 10721 10722 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10723 struct sk_msg, sk), 10724 si->dst_reg, si->src_reg, 10725 offsetof(struct sk_msg, sk)); 10726 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10727 offsetof(struct sock_common, skc_daddr)); 10728 break; 10729 10730 case offsetof(struct sk_msg_md, local_ip4): 10731 BUILD_BUG_ON(sizeof_field(struct sock_common, 10732 skc_rcv_saddr) != 4); 10733 10734 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10735 struct sk_msg, sk), 10736 si->dst_reg, si->src_reg, 10737 offsetof(struct sk_msg, sk)); 10738 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10739 offsetof(struct sock_common, 10740 skc_rcv_saddr)); 10741 break; 10742 10743 case offsetof(struct sk_msg_md, remote_ip6[0]) ... 10744 offsetof(struct sk_msg_md, remote_ip6[3]): 10745 #if IS_ENABLED(CONFIG_IPV6) 10746 BUILD_BUG_ON(sizeof_field(struct sock_common, 10747 skc_v6_daddr.s6_addr32[0]) != 4); 10748 10749 off = si->off; 10750 off -= offsetof(struct sk_msg_md, remote_ip6[0]); 10751 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10752 struct sk_msg, sk), 10753 si->dst_reg, si->src_reg, 10754 offsetof(struct sk_msg, sk)); 10755 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10756 offsetof(struct sock_common, 10757 skc_v6_daddr.s6_addr32[0]) + 10758 off); 10759 #else 10760 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 10761 #endif 10762 break; 10763 10764 case offsetof(struct sk_msg_md, local_ip6[0]) ... 10765 offsetof(struct sk_msg_md, local_ip6[3]): 10766 #if IS_ENABLED(CONFIG_IPV6) 10767 BUILD_BUG_ON(sizeof_field(struct sock_common, 10768 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 10769 10770 off = si->off; 10771 off -= offsetof(struct sk_msg_md, local_ip6[0]); 10772 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10773 struct sk_msg, sk), 10774 si->dst_reg, si->src_reg, 10775 offsetof(struct sk_msg, sk)); 10776 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10777 offsetof(struct sock_common, 10778 skc_v6_rcv_saddr.s6_addr32[0]) + 10779 off); 10780 #else 10781 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 10782 #endif 10783 break; 10784 10785 case offsetof(struct sk_msg_md, remote_port): 10786 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); 10787 10788 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10789 struct sk_msg, sk), 10790 si->dst_reg, si->src_reg, 10791 offsetof(struct sk_msg, sk)); 10792 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10793 offsetof(struct sock_common, skc_dport)); 10794 #ifndef __BIG_ENDIAN_BITFIELD 10795 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 10796 #endif 10797 break; 10798 10799 case offsetof(struct sk_msg_md, local_port): 10800 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); 10801 10802 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10803 struct sk_msg, sk), 10804 si->dst_reg, si->src_reg, 10805 offsetof(struct sk_msg, sk)); 10806 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10807 offsetof(struct sock_common, skc_num)); 10808 break; 10809 10810 case offsetof(struct sk_msg_md, size): 10811 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_sg, size), 10812 si->dst_reg, si->src_reg, 10813 offsetof(struct sk_msg_sg, size)); 10814 break; 10815 10816 case offsetof(struct sk_msg_md, sk): 10817 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, sk), 10818 si->dst_reg, si->src_reg, 10819 offsetof(struct sk_msg, sk)); 10820 break; 10821 } 10822 10823 return insn - insn_buf; 10824 } 10825 10826 const struct bpf_verifier_ops sk_filter_verifier_ops = { 10827 .get_func_proto = sk_filter_func_proto, 10828 .is_valid_access = sk_filter_is_valid_access, 10829 .convert_ctx_access = bpf_convert_ctx_access, 10830 .gen_ld_abs = bpf_gen_ld_abs, 10831 }; 10832 10833 const struct bpf_prog_ops sk_filter_prog_ops = { 10834 .test_run = bpf_prog_test_run_skb, 10835 }; 10836 10837 const struct bpf_verifier_ops tc_cls_act_verifier_ops = { 10838 .get_func_proto = tc_cls_act_func_proto, 10839 .is_valid_access = tc_cls_act_is_valid_access, 10840 .convert_ctx_access = tc_cls_act_convert_ctx_access, 10841 .gen_prologue = tc_cls_act_prologue, 10842 .gen_ld_abs = bpf_gen_ld_abs, 10843 .btf_struct_access = tc_cls_act_btf_struct_access, 10844 }; 10845 10846 const struct bpf_prog_ops tc_cls_act_prog_ops = { 10847 .test_run = bpf_prog_test_run_skb, 10848 }; 10849 10850 const struct bpf_verifier_ops xdp_verifier_ops = { 10851 .get_func_proto = xdp_func_proto, 10852 .is_valid_access = xdp_is_valid_access, 10853 .convert_ctx_access = xdp_convert_ctx_access, 10854 .gen_prologue = bpf_noop_prologue, 10855 .btf_struct_access = xdp_btf_struct_access, 10856 }; 10857 10858 const struct bpf_prog_ops xdp_prog_ops = { 10859 .test_run = bpf_prog_test_run_xdp, 10860 }; 10861 10862 const struct bpf_verifier_ops cg_skb_verifier_ops = { 10863 .get_func_proto = cg_skb_func_proto, 10864 .is_valid_access = cg_skb_is_valid_access, 10865 .convert_ctx_access = bpf_convert_ctx_access, 10866 }; 10867 10868 const struct bpf_prog_ops cg_skb_prog_ops = { 10869 .test_run = bpf_prog_test_run_skb, 10870 }; 10871 10872 const struct bpf_verifier_ops lwt_in_verifier_ops = { 10873 .get_func_proto = lwt_in_func_proto, 10874 .is_valid_access = lwt_is_valid_access, 10875 .convert_ctx_access = bpf_convert_ctx_access, 10876 }; 10877 10878 const struct bpf_prog_ops lwt_in_prog_ops = { 10879 .test_run = bpf_prog_test_run_skb, 10880 }; 10881 10882 const struct bpf_verifier_ops lwt_out_verifier_ops = { 10883 .get_func_proto = lwt_out_func_proto, 10884 .is_valid_access = lwt_is_valid_access, 10885 .convert_ctx_access = bpf_convert_ctx_access, 10886 }; 10887 10888 const struct bpf_prog_ops lwt_out_prog_ops = { 10889 .test_run = bpf_prog_test_run_skb, 10890 }; 10891 10892 const struct bpf_verifier_ops lwt_xmit_verifier_ops = { 10893 .get_func_proto = lwt_xmit_func_proto, 10894 .is_valid_access = lwt_is_valid_access, 10895 .convert_ctx_access = bpf_convert_ctx_access, 10896 .gen_prologue = tc_cls_act_prologue, 10897 }; 10898 10899 const struct bpf_prog_ops lwt_xmit_prog_ops = { 10900 .test_run = bpf_prog_test_run_skb, 10901 }; 10902 10903 const struct bpf_verifier_ops lwt_seg6local_verifier_ops = { 10904 .get_func_proto = lwt_seg6local_func_proto, 10905 .is_valid_access = lwt_is_valid_access, 10906 .convert_ctx_access = bpf_convert_ctx_access, 10907 }; 10908 10909 const struct bpf_prog_ops lwt_seg6local_prog_ops = { 10910 .test_run = bpf_prog_test_run_skb, 10911 }; 10912 10913 const struct bpf_verifier_ops cg_sock_verifier_ops = { 10914 .get_func_proto = sock_filter_func_proto, 10915 .is_valid_access = sock_filter_is_valid_access, 10916 .convert_ctx_access = bpf_sock_convert_ctx_access, 10917 }; 10918 10919 const struct bpf_prog_ops cg_sock_prog_ops = { 10920 }; 10921 10922 const struct bpf_verifier_ops cg_sock_addr_verifier_ops = { 10923 .get_func_proto = sock_addr_func_proto, 10924 .is_valid_access = sock_addr_is_valid_access, 10925 .convert_ctx_access = sock_addr_convert_ctx_access, 10926 }; 10927 10928 const struct bpf_prog_ops cg_sock_addr_prog_ops = { 10929 }; 10930 10931 const struct bpf_verifier_ops sock_ops_verifier_ops = { 10932 .get_func_proto = sock_ops_func_proto, 10933 .is_valid_access = sock_ops_is_valid_access, 10934 .convert_ctx_access = sock_ops_convert_ctx_access, 10935 }; 10936 10937 const struct bpf_prog_ops sock_ops_prog_ops = { 10938 }; 10939 10940 const struct bpf_verifier_ops sk_skb_verifier_ops = { 10941 .get_func_proto = sk_skb_func_proto, 10942 .is_valid_access = sk_skb_is_valid_access, 10943 .convert_ctx_access = sk_skb_convert_ctx_access, 10944 .gen_prologue = sk_skb_prologue, 10945 }; 10946 10947 const struct bpf_prog_ops sk_skb_prog_ops = { 10948 }; 10949 10950 const struct bpf_verifier_ops sk_msg_verifier_ops = { 10951 .get_func_proto = sk_msg_func_proto, 10952 .is_valid_access = sk_msg_is_valid_access, 10953 .convert_ctx_access = sk_msg_convert_ctx_access, 10954 .gen_prologue = bpf_noop_prologue, 10955 }; 10956 10957 const struct bpf_prog_ops sk_msg_prog_ops = { 10958 }; 10959 10960 const struct bpf_verifier_ops flow_dissector_verifier_ops = { 10961 .get_func_proto = flow_dissector_func_proto, 10962 .is_valid_access = flow_dissector_is_valid_access, 10963 .convert_ctx_access = flow_dissector_convert_ctx_access, 10964 }; 10965 10966 const struct bpf_prog_ops flow_dissector_prog_ops = { 10967 .test_run = bpf_prog_test_run_flow_dissector, 10968 }; 10969 10970 int sk_detach_filter(struct sock *sk) 10971 { 10972 int ret = -ENOENT; 10973 struct sk_filter *filter; 10974 10975 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 10976 return -EPERM; 10977 10978 filter = rcu_dereference_protected(sk->sk_filter, 10979 lockdep_sock_is_held(sk)); 10980 if (filter) { 10981 RCU_INIT_POINTER(sk->sk_filter, NULL); 10982 sk_filter_uncharge(sk, filter); 10983 ret = 0; 10984 } 10985 10986 return ret; 10987 } 10988 EXPORT_SYMBOL_GPL(sk_detach_filter); 10989 10990 int sk_get_filter(struct sock *sk, sockptr_t optval, unsigned int len) 10991 { 10992 struct sock_fprog_kern *fprog; 10993 struct sk_filter *filter; 10994 int ret = 0; 10995 10996 sockopt_lock_sock(sk); 10997 filter = rcu_dereference_protected(sk->sk_filter, 10998 lockdep_sock_is_held(sk)); 10999 if (!filter) 11000 goto out; 11001 11002 /* We're copying the filter that has been originally attached, 11003 * so no conversion/decode needed anymore. eBPF programs that 11004 * have no original program cannot be dumped through this. 11005 */ 11006 ret = -EACCES; 11007 fprog = filter->prog->orig_prog; 11008 if (!fprog) 11009 goto out; 11010 11011 ret = fprog->len; 11012 if (!len) 11013 /* User space only enquires number of filter blocks. */ 11014 goto out; 11015 11016 ret = -EINVAL; 11017 if (len < fprog->len) 11018 goto out; 11019 11020 ret = -EFAULT; 11021 if (copy_to_sockptr(optval, fprog->filter, bpf_classic_proglen(fprog))) 11022 goto out; 11023 11024 /* Instead of bytes, the API requests to return the number 11025 * of filter blocks. 11026 */ 11027 ret = fprog->len; 11028 out: 11029 sockopt_release_sock(sk); 11030 return ret; 11031 } 11032 11033 #ifdef CONFIG_INET 11034 static void bpf_init_reuseport_kern(struct sk_reuseport_kern *reuse_kern, 11035 struct sock_reuseport *reuse, 11036 struct sock *sk, struct sk_buff *skb, 11037 struct sock *migrating_sk, 11038 u32 hash) 11039 { 11040 reuse_kern->skb = skb; 11041 reuse_kern->sk = sk; 11042 reuse_kern->selected_sk = NULL; 11043 reuse_kern->migrating_sk = migrating_sk; 11044 reuse_kern->data_end = skb->data + skb_headlen(skb); 11045 reuse_kern->hash = hash; 11046 reuse_kern->reuseport_id = reuse->reuseport_id; 11047 reuse_kern->bind_inany = reuse->bind_inany; 11048 } 11049 11050 struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk, 11051 struct bpf_prog *prog, struct sk_buff *skb, 11052 struct sock *migrating_sk, 11053 u32 hash) 11054 { 11055 struct sk_reuseport_kern reuse_kern; 11056 enum sk_action action; 11057 11058 bpf_init_reuseport_kern(&reuse_kern, reuse, sk, skb, migrating_sk, hash); 11059 action = bpf_prog_run(prog, &reuse_kern); 11060 11061 if (action == SK_PASS) 11062 return reuse_kern.selected_sk; 11063 else 11064 return ERR_PTR(-ECONNREFUSED); 11065 } 11066 11067 BPF_CALL_4(sk_select_reuseport, struct sk_reuseport_kern *, reuse_kern, 11068 struct bpf_map *, map, void *, key, u32, flags) 11069 { 11070 bool is_sockarray = map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY; 11071 struct sock_reuseport *reuse; 11072 struct sock *selected_sk; 11073 11074 selected_sk = map->ops->map_lookup_elem(map, key); 11075 if (!selected_sk) 11076 return -ENOENT; 11077 11078 reuse = rcu_dereference(selected_sk->sk_reuseport_cb); 11079 if (!reuse) { 11080 /* Lookup in sock_map can return TCP ESTABLISHED sockets. */ 11081 if (sk_is_refcounted(selected_sk)) 11082 sock_put(selected_sk); 11083 11084 /* reuseport_array has only sk with non NULL sk_reuseport_cb. 11085 * The only (!reuse) case here is - the sk has already been 11086 * unhashed (e.g. by close()), so treat it as -ENOENT. 11087 * 11088 * Other maps (e.g. sock_map) do not provide this guarantee and 11089 * the sk may never be in the reuseport group to begin with. 11090 */ 11091 return is_sockarray ? -ENOENT : -EINVAL; 11092 } 11093 11094 if (unlikely(reuse->reuseport_id != reuse_kern->reuseport_id)) { 11095 struct sock *sk = reuse_kern->sk; 11096 11097 if (sk->sk_protocol != selected_sk->sk_protocol) 11098 return -EPROTOTYPE; 11099 else if (sk->sk_family != selected_sk->sk_family) 11100 return -EAFNOSUPPORT; 11101 11102 /* Catch all. Likely bound to a different sockaddr. */ 11103 return -EBADFD; 11104 } 11105 11106 reuse_kern->selected_sk = selected_sk; 11107 11108 return 0; 11109 } 11110 11111 static const struct bpf_func_proto sk_select_reuseport_proto = { 11112 .func = sk_select_reuseport, 11113 .gpl_only = false, 11114 .ret_type = RET_INTEGER, 11115 .arg1_type = ARG_PTR_TO_CTX, 11116 .arg2_type = ARG_CONST_MAP_PTR, 11117 .arg3_type = ARG_PTR_TO_MAP_KEY, 11118 .arg4_type = ARG_ANYTHING, 11119 }; 11120 11121 BPF_CALL_4(sk_reuseport_load_bytes, 11122 const struct sk_reuseport_kern *, reuse_kern, u32, offset, 11123 void *, to, u32, len) 11124 { 11125 return ____bpf_skb_load_bytes(reuse_kern->skb, offset, to, len); 11126 } 11127 11128 static const struct bpf_func_proto sk_reuseport_load_bytes_proto = { 11129 .func = sk_reuseport_load_bytes, 11130 .gpl_only = false, 11131 .ret_type = RET_INTEGER, 11132 .arg1_type = ARG_PTR_TO_CTX, 11133 .arg2_type = ARG_ANYTHING, 11134 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 11135 .arg4_type = ARG_CONST_SIZE, 11136 }; 11137 11138 BPF_CALL_5(sk_reuseport_load_bytes_relative, 11139 const struct sk_reuseport_kern *, reuse_kern, u32, offset, 11140 void *, to, u32, len, u32, start_header) 11141 { 11142 return ____bpf_skb_load_bytes_relative(reuse_kern->skb, offset, to, 11143 len, start_header); 11144 } 11145 11146 static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto = { 11147 .func = sk_reuseport_load_bytes_relative, 11148 .gpl_only = false, 11149 .ret_type = RET_INTEGER, 11150 .arg1_type = ARG_PTR_TO_CTX, 11151 .arg2_type = ARG_ANYTHING, 11152 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 11153 .arg4_type = ARG_CONST_SIZE, 11154 .arg5_type = ARG_ANYTHING, 11155 }; 11156 11157 static const struct bpf_func_proto * 11158 sk_reuseport_func_proto(enum bpf_func_id func_id, 11159 const struct bpf_prog *prog) 11160 { 11161 switch (func_id) { 11162 case BPF_FUNC_sk_select_reuseport: 11163 return &sk_select_reuseport_proto; 11164 case BPF_FUNC_skb_load_bytes: 11165 return &sk_reuseport_load_bytes_proto; 11166 case BPF_FUNC_skb_load_bytes_relative: 11167 return &sk_reuseport_load_bytes_relative_proto; 11168 case BPF_FUNC_get_socket_cookie: 11169 return &bpf_get_socket_ptr_cookie_proto; 11170 case BPF_FUNC_ktime_get_coarse_ns: 11171 return &bpf_ktime_get_coarse_ns_proto; 11172 default: 11173 return bpf_base_func_proto(func_id); 11174 } 11175 } 11176 11177 static bool 11178 sk_reuseport_is_valid_access(int off, int size, 11179 enum bpf_access_type type, 11180 const struct bpf_prog *prog, 11181 struct bpf_insn_access_aux *info) 11182 { 11183 const u32 size_default = sizeof(__u32); 11184 11185 if (off < 0 || off >= sizeof(struct sk_reuseport_md) || 11186 off % size || type != BPF_READ) 11187 return false; 11188 11189 switch (off) { 11190 case offsetof(struct sk_reuseport_md, data): 11191 info->reg_type = PTR_TO_PACKET; 11192 return size == sizeof(__u64); 11193 11194 case offsetof(struct sk_reuseport_md, data_end): 11195 info->reg_type = PTR_TO_PACKET_END; 11196 return size == sizeof(__u64); 11197 11198 case offsetof(struct sk_reuseport_md, hash): 11199 return size == size_default; 11200 11201 case offsetof(struct sk_reuseport_md, sk): 11202 info->reg_type = PTR_TO_SOCKET; 11203 return size == sizeof(__u64); 11204 11205 case offsetof(struct sk_reuseport_md, migrating_sk): 11206 info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL; 11207 return size == sizeof(__u64); 11208 11209 /* Fields that allow narrowing */ 11210 case bpf_ctx_range(struct sk_reuseport_md, eth_protocol): 11211 if (size < sizeof_field(struct sk_buff, protocol)) 11212 return false; 11213 fallthrough; 11214 case bpf_ctx_range(struct sk_reuseport_md, ip_protocol): 11215 case bpf_ctx_range(struct sk_reuseport_md, bind_inany): 11216 case bpf_ctx_range(struct sk_reuseport_md, len): 11217 bpf_ctx_record_field_size(info, size_default); 11218 return bpf_ctx_narrow_access_ok(off, size, size_default); 11219 11220 default: 11221 return false; 11222 } 11223 } 11224 11225 #define SK_REUSEPORT_LOAD_FIELD(F) ({ \ 11226 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \ 11227 si->dst_reg, si->src_reg, \ 11228 bpf_target_off(struct sk_reuseport_kern, F, \ 11229 sizeof_field(struct sk_reuseport_kern, F), \ 11230 target_size)); \ 11231 }) 11232 11233 #define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD) \ 11234 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \ 11235 struct sk_buff, \ 11236 skb, \ 11237 SKB_FIELD) 11238 11239 #define SK_REUSEPORT_LOAD_SK_FIELD(SK_FIELD) \ 11240 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \ 11241 struct sock, \ 11242 sk, \ 11243 SK_FIELD) 11244 11245 static u32 sk_reuseport_convert_ctx_access(enum bpf_access_type type, 11246 const struct bpf_insn *si, 11247 struct bpf_insn *insn_buf, 11248 struct bpf_prog *prog, 11249 u32 *target_size) 11250 { 11251 struct bpf_insn *insn = insn_buf; 11252 11253 switch (si->off) { 11254 case offsetof(struct sk_reuseport_md, data): 11255 SK_REUSEPORT_LOAD_SKB_FIELD(data); 11256 break; 11257 11258 case offsetof(struct sk_reuseport_md, len): 11259 SK_REUSEPORT_LOAD_SKB_FIELD(len); 11260 break; 11261 11262 case offsetof(struct sk_reuseport_md, eth_protocol): 11263 SK_REUSEPORT_LOAD_SKB_FIELD(protocol); 11264 break; 11265 11266 case offsetof(struct sk_reuseport_md, ip_protocol): 11267 SK_REUSEPORT_LOAD_SK_FIELD(sk_protocol); 11268 break; 11269 11270 case offsetof(struct sk_reuseport_md, data_end): 11271 SK_REUSEPORT_LOAD_FIELD(data_end); 11272 break; 11273 11274 case offsetof(struct sk_reuseport_md, hash): 11275 SK_REUSEPORT_LOAD_FIELD(hash); 11276 break; 11277 11278 case offsetof(struct sk_reuseport_md, bind_inany): 11279 SK_REUSEPORT_LOAD_FIELD(bind_inany); 11280 break; 11281 11282 case offsetof(struct sk_reuseport_md, sk): 11283 SK_REUSEPORT_LOAD_FIELD(sk); 11284 break; 11285 11286 case offsetof(struct sk_reuseport_md, migrating_sk): 11287 SK_REUSEPORT_LOAD_FIELD(migrating_sk); 11288 break; 11289 } 11290 11291 return insn - insn_buf; 11292 } 11293 11294 const struct bpf_verifier_ops sk_reuseport_verifier_ops = { 11295 .get_func_proto = sk_reuseport_func_proto, 11296 .is_valid_access = sk_reuseport_is_valid_access, 11297 .convert_ctx_access = sk_reuseport_convert_ctx_access, 11298 }; 11299 11300 const struct bpf_prog_ops sk_reuseport_prog_ops = { 11301 }; 11302 11303 DEFINE_STATIC_KEY_FALSE(bpf_sk_lookup_enabled); 11304 EXPORT_SYMBOL(bpf_sk_lookup_enabled); 11305 11306 BPF_CALL_3(bpf_sk_lookup_assign, struct bpf_sk_lookup_kern *, ctx, 11307 struct sock *, sk, u64, flags) 11308 { 11309 if (unlikely(flags & ~(BPF_SK_LOOKUP_F_REPLACE | 11310 BPF_SK_LOOKUP_F_NO_REUSEPORT))) 11311 return -EINVAL; 11312 if (unlikely(sk && sk_is_refcounted(sk))) 11313 return -ESOCKTNOSUPPORT; /* reject non-RCU freed sockets */ 11314 if (unlikely(sk && sk_is_tcp(sk) && sk->sk_state != TCP_LISTEN)) 11315 return -ESOCKTNOSUPPORT; /* only accept TCP socket in LISTEN */ 11316 if (unlikely(sk && sk_is_udp(sk) && sk->sk_state != TCP_CLOSE)) 11317 return -ESOCKTNOSUPPORT; /* only accept UDP socket in CLOSE */ 11318 11319 /* Check if socket is suitable for packet L3/L4 protocol */ 11320 if (sk && sk->sk_protocol != ctx->protocol) 11321 return -EPROTOTYPE; 11322 if (sk && sk->sk_family != ctx->family && 11323 (sk->sk_family == AF_INET || ipv6_only_sock(sk))) 11324 return -EAFNOSUPPORT; 11325 11326 if (ctx->selected_sk && !(flags & BPF_SK_LOOKUP_F_REPLACE)) 11327 return -EEXIST; 11328 11329 /* Select socket as lookup result */ 11330 ctx->selected_sk = sk; 11331 ctx->no_reuseport = flags & BPF_SK_LOOKUP_F_NO_REUSEPORT; 11332 return 0; 11333 } 11334 11335 static const struct bpf_func_proto bpf_sk_lookup_assign_proto = { 11336 .func = bpf_sk_lookup_assign, 11337 .gpl_only = false, 11338 .ret_type = RET_INTEGER, 11339 .arg1_type = ARG_PTR_TO_CTX, 11340 .arg2_type = ARG_PTR_TO_SOCKET_OR_NULL, 11341 .arg3_type = ARG_ANYTHING, 11342 }; 11343 11344 static const struct bpf_func_proto * 11345 sk_lookup_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 11346 { 11347 switch (func_id) { 11348 case BPF_FUNC_perf_event_output: 11349 return &bpf_event_output_data_proto; 11350 case BPF_FUNC_sk_assign: 11351 return &bpf_sk_lookup_assign_proto; 11352 case BPF_FUNC_sk_release: 11353 return &bpf_sk_release_proto; 11354 default: 11355 return bpf_sk_base_func_proto(func_id); 11356 } 11357 } 11358 11359 static bool sk_lookup_is_valid_access(int off, int size, 11360 enum bpf_access_type type, 11361 const struct bpf_prog *prog, 11362 struct bpf_insn_access_aux *info) 11363 { 11364 if (off < 0 || off >= sizeof(struct bpf_sk_lookup)) 11365 return false; 11366 if (off % size != 0) 11367 return false; 11368 if (type != BPF_READ) 11369 return false; 11370 11371 switch (off) { 11372 case offsetof(struct bpf_sk_lookup, sk): 11373 info->reg_type = PTR_TO_SOCKET_OR_NULL; 11374 return size == sizeof(__u64); 11375 11376 case bpf_ctx_range(struct bpf_sk_lookup, family): 11377 case bpf_ctx_range(struct bpf_sk_lookup, protocol): 11378 case bpf_ctx_range(struct bpf_sk_lookup, remote_ip4): 11379 case bpf_ctx_range(struct bpf_sk_lookup, local_ip4): 11380 case bpf_ctx_range_till(struct bpf_sk_lookup, remote_ip6[0], remote_ip6[3]): 11381 case bpf_ctx_range_till(struct bpf_sk_lookup, local_ip6[0], local_ip6[3]): 11382 case bpf_ctx_range(struct bpf_sk_lookup, local_port): 11383 case bpf_ctx_range(struct bpf_sk_lookup, ingress_ifindex): 11384 bpf_ctx_record_field_size(info, sizeof(__u32)); 11385 return bpf_ctx_narrow_access_ok(off, size, sizeof(__u32)); 11386 11387 case bpf_ctx_range(struct bpf_sk_lookup, remote_port): 11388 /* Allow 4-byte access to 2-byte field for backward compatibility */ 11389 if (size == sizeof(__u32)) 11390 return true; 11391 bpf_ctx_record_field_size(info, sizeof(__be16)); 11392 return bpf_ctx_narrow_access_ok(off, size, sizeof(__be16)); 11393 11394 case offsetofend(struct bpf_sk_lookup, remote_port) ... 11395 offsetof(struct bpf_sk_lookup, local_ip4) - 1: 11396 /* Allow access to zero padding for backward compatibility */ 11397 bpf_ctx_record_field_size(info, sizeof(__u16)); 11398 return bpf_ctx_narrow_access_ok(off, size, sizeof(__u16)); 11399 11400 default: 11401 return false; 11402 } 11403 } 11404 11405 static u32 sk_lookup_convert_ctx_access(enum bpf_access_type type, 11406 const struct bpf_insn *si, 11407 struct bpf_insn *insn_buf, 11408 struct bpf_prog *prog, 11409 u32 *target_size) 11410 { 11411 struct bpf_insn *insn = insn_buf; 11412 11413 switch (si->off) { 11414 case offsetof(struct bpf_sk_lookup, sk): 11415 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg, 11416 offsetof(struct bpf_sk_lookup_kern, selected_sk)); 11417 break; 11418 11419 case offsetof(struct bpf_sk_lookup, family): 11420 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 11421 bpf_target_off(struct bpf_sk_lookup_kern, 11422 family, 2, target_size)); 11423 break; 11424 11425 case offsetof(struct bpf_sk_lookup, protocol): 11426 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 11427 bpf_target_off(struct bpf_sk_lookup_kern, 11428 protocol, 2, target_size)); 11429 break; 11430 11431 case offsetof(struct bpf_sk_lookup, remote_ip4): 11432 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 11433 bpf_target_off(struct bpf_sk_lookup_kern, 11434 v4.saddr, 4, target_size)); 11435 break; 11436 11437 case offsetof(struct bpf_sk_lookup, local_ip4): 11438 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 11439 bpf_target_off(struct bpf_sk_lookup_kern, 11440 v4.daddr, 4, target_size)); 11441 break; 11442 11443 case bpf_ctx_range_till(struct bpf_sk_lookup, 11444 remote_ip6[0], remote_ip6[3]): { 11445 #if IS_ENABLED(CONFIG_IPV6) 11446 int off = si->off; 11447 11448 off -= offsetof(struct bpf_sk_lookup, remote_ip6[0]); 11449 off += bpf_target_off(struct in6_addr, s6_addr32[0], 4, target_size); 11450 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg, 11451 offsetof(struct bpf_sk_lookup_kern, v6.saddr)); 11452 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 11453 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, off); 11454 #else 11455 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 11456 #endif 11457 break; 11458 } 11459 case bpf_ctx_range_till(struct bpf_sk_lookup, 11460 local_ip6[0], local_ip6[3]): { 11461 #if IS_ENABLED(CONFIG_IPV6) 11462 int off = si->off; 11463 11464 off -= offsetof(struct bpf_sk_lookup, local_ip6[0]); 11465 off += bpf_target_off(struct in6_addr, s6_addr32[0], 4, target_size); 11466 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg, 11467 offsetof(struct bpf_sk_lookup_kern, v6.daddr)); 11468 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 11469 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, off); 11470 #else 11471 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 11472 #endif 11473 break; 11474 } 11475 case offsetof(struct bpf_sk_lookup, remote_port): 11476 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 11477 bpf_target_off(struct bpf_sk_lookup_kern, 11478 sport, 2, target_size)); 11479 break; 11480 11481 case offsetofend(struct bpf_sk_lookup, remote_port): 11482 *target_size = 2; 11483 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 11484 break; 11485 11486 case offsetof(struct bpf_sk_lookup, local_port): 11487 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 11488 bpf_target_off(struct bpf_sk_lookup_kern, 11489 dport, 2, target_size)); 11490 break; 11491 11492 case offsetof(struct bpf_sk_lookup, ingress_ifindex): 11493 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 11494 bpf_target_off(struct bpf_sk_lookup_kern, 11495 ingress_ifindex, 4, target_size)); 11496 break; 11497 } 11498 11499 return insn - insn_buf; 11500 } 11501 11502 const struct bpf_prog_ops sk_lookup_prog_ops = { 11503 .test_run = bpf_prog_test_run_sk_lookup, 11504 }; 11505 11506 const struct bpf_verifier_ops sk_lookup_verifier_ops = { 11507 .get_func_proto = sk_lookup_func_proto, 11508 .is_valid_access = sk_lookup_is_valid_access, 11509 .convert_ctx_access = sk_lookup_convert_ctx_access, 11510 }; 11511 11512 #endif /* CONFIG_INET */ 11513 11514 DEFINE_BPF_DISPATCHER(xdp) 11515 11516 void bpf_prog_change_xdp(struct bpf_prog *prev_prog, struct bpf_prog *prog) 11517 { 11518 bpf_dispatcher_change_prog(BPF_DISPATCHER_PTR(xdp), prev_prog, prog); 11519 } 11520 11521 BTF_ID_LIST_GLOBAL(btf_sock_ids, MAX_BTF_SOCK_TYPE) 11522 #define BTF_SOCK_TYPE(name, type) BTF_ID(struct, type) 11523 BTF_SOCK_TYPE_xxx 11524 #undef BTF_SOCK_TYPE 11525 11526 BPF_CALL_1(bpf_skc_to_tcp6_sock, struct sock *, sk) 11527 { 11528 /* tcp6_sock type is not generated in dwarf and hence btf, 11529 * trigger an explicit type generation here. 11530 */ 11531 BTF_TYPE_EMIT(struct tcp6_sock); 11532 if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP && 11533 sk->sk_family == AF_INET6) 11534 return (unsigned long)sk; 11535 11536 return (unsigned long)NULL; 11537 } 11538 11539 const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto = { 11540 .func = bpf_skc_to_tcp6_sock, 11541 .gpl_only = false, 11542 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11543 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11544 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP6], 11545 }; 11546 11547 BPF_CALL_1(bpf_skc_to_tcp_sock, struct sock *, sk) 11548 { 11549 if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP) 11550 return (unsigned long)sk; 11551 11552 return (unsigned long)NULL; 11553 } 11554 11555 const struct bpf_func_proto bpf_skc_to_tcp_sock_proto = { 11556 .func = bpf_skc_to_tcp_sock, 11557 .gpl_only = false, 11558 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11559 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11560 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP], 11561 }; 11562 11563 BPF_CALL_1(bpf_skc_to_tcp_timewait_sock, struct sock *, sk) 11564 { 11565 /* BTF types for tcp_timewait_sock and inet_timewait_sock are not 11566 * generated if CONFIG_INET=n. Trigger an explicit generation here. 11567 */ 11568 BTF_TYPE_EMIT(struct inet_timewait_sock); 11569 BTF_TYPE_EMIT(struct tcp_timewait_sock); 11570 11571 #ifdef CONFIG_INET 11572 if (sk && sk->sk_prot == &tcp_prot && sk->sk_state == TCP_TIME_WAIT) 11573 return (unsigned long)sk; 11574 #endif 11575 11576 #if IS_BUILTIN(CONFIG_IPV6) 11577 if (sk && sk->sk_prot == &tcpv6_prot && sk->sk_state == TCP_TIME_WAIT) 11578 return (unsigned long)sk; 11579 #endif 11580 11581 return (unsigned long)NULL; 11582 } 11583 11584 const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto = { 11585 .func = bpf_skc_to_tcp_timewait_sock, 11586 .gpl_only = false, 11587 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11588 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11589 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP_TW], 11590 }; 11591 11592 BPF_CALL_1(bpf_skc_to_tcp_request_sock, struct sock *, sk) 11593 { 11594 #ifdef CONFIG_INET 11595 if (sk && sk->sk_prot == &tcp_prot && sk->sk_state == TCP_NEW_SYN_RECV) 11596 return (unsigned long)sk; 11597 #endif 11598 11599 #if IS_BUILTIN(CONFIG_IPV6) 11600 if (sk && sk->sk_prot == &tcpv6_prot && sk->sk_state == TCP_NEW_SYN_RECV) 11601 return (unsigned long)sk; 11602 #endif 11603 11604 return (unsigned long)NULL; 11605 } 11606 11607 const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto = { 11608 .func = bpf_skc_to_tcp_request_sock, 11609 .gpl_only = false, 11610 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11611 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11612 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP_REQ], 11613 }; 11614 11615 BPF_CALL_1(bpf_skc_to_udp6_sock, struct sock *, sk) 11616 { 11617 /* udp6_sock type is not generated in dwarf and hence btf, 11618 * trigger an explicit type generation here. 11619 */ 11620 BTF_TYPE_EMIT(struct udp6_sock); 11621 if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_UDP && 11622 sk->sk_type == SOCK_DGRAM && sk->sk_family == AF_INET6) 11623 return (unsigned long)sk; 11624 11625 return (unsigned long)NULL; 11626 } 11627 11628 const struct bpf_func_proto bpf_skc_to_udp6_sock_proto = { 11629 .func = bpf_skc_to_udp6_sock, 11630 .gpl_only = false, 11631 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11632 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11633 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_UDP6], 11634 }; 11635 11636 BPF_CALL_1(bpf_skc_to_unix_sock, struct sock *, sk) 11637 { 11638 /* unix_sock type is not generated in dwarf and hence btf, 11639 * trigger an explicit type generation here. 11640 */ 11641 BTF_TYPE_EMIT(struct unix_sock); 11642 if (sk && sk_fullsock(sk) && sk->sk_family == AF_UNIX) 11643 return (unsigned long)sk; 11644 11645 return (unsigned long)NULL; 11646 } 11647 11648 const struct bpf_func_proto bpf_skc_to_unix_sock_proto = { 11649 .func = bpf_skc_to_unix_sock, 11650 .gpl_only = false, 11651 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11652 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11653 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_UNIX], 11654 }; 11655 11656 BPF_CALL_1(bpf_skc_to_mptcp_sock, struct sock *, sk) 11657 { 11658 BTF_TYPE_EMIT(struct mptcp_sock); 11659 return (unsigned long)bpf_mptcp_sock_from_subflow(sk); 11660 } 11661 11662 const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto = { 11663 .func = bpf_skc_to_mptcp_sock, 11664 .gpl_only = false, 11665 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11666 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 11667 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_MPTCP], 11668 }; 11669 11670 BPF_CALL_1(bpf_sock_from_file, struct file *, file) 11671 { 11672 return (unsigned long)sock_from_file(file); 11673 } 11674 11675 BTF_ID_LIST(bpf_sock_from_file_btf_ids) 11676 BTF_ID(struct, socket) 11677 BTF_ID(struct, file) 11678 11679 const struct bpf_func_proto bpf_sock_from_file_proto = { 11680 .func = bpf_sock_from_file, 11681 .gpl_only = false, 11682 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11683 .ret_btf_id = &bpf_sock_from_file_btf_ids[0], 11684 .arg1_type = ARG_PTR_TO_BTF_ID, 11685 .arg1_btf_id = &bpf_sock_from_file_btf_ids[1], 11686 }; 11687 11688 static const struct bpf_func_proto * 11689 bpf_sk_base_func_proto(enum bpf_func_id func_id) 11690 { 11691 const struct bpf_func_proto *func; 11692 11693 switch (func_id) { 11694 case BPF_FUNC_skc_to_tcp6_sock: 11695 func = &bpf_skc_to_tcp6_sock_proto; 11696 break; 11697 case BPF_FUNC_skc_to_tcp_sock: 11698 func = &bpf_skc_to_tcp_sock_proto; 11699 break; 11700 case BPF_FUNC_skc_to_tcp_timewait_sock: 11701 func = &bpf_skc_to_tcp_timewait_sock_proto; 11702 break; 11703 case BPF_FUNC_skc_to_tcp_request_sock: 11704 func = &bpf_skc_to_tcp_request_sock_proto; 11705 break; 11706 case BPF_FUNC_skc_to_udp6_sock: 11707 func = &bpf_skc_to_udp6_sock_proto; 11708 break; 11709 case BPF_FUNC_skc_to_unix_sock: 11710 func = &bpf_skc_to_unix_sock_proto; 11711 break; 11712 case BPF_FUNC_skc_to_mptcp_sock: 11713 func = &bpf_skc_to_mptcp_sock_proto; 11714 break; 11715 case BPF_FUNC_ktime_get_coarse_ns: 11716 return &bpf_ktime_get_coarse_ns_proto; 11717 default: 11718 return bpf_base_func_proto(func_id); 11719 } 11720 11721 if (!perfmon_capable()) 11722 return NULL; 11723 11724 return func; 11725 } 11726 11727 __diag_push(); 11728 __diag_ignore_all("-Wmissing-prototypes", 11729 "Global functions as their definitions will be in vmlinux BTF"); 11730 __bpf_kfunc int bpf_dynptr_from_skb(struct sk_buff *skb, u64 flags, 11731 struct bpf_dynptr_kern *ptr__uninit) 11732 { 11733 if (flags) { 11734 bpf_dynptr_set_null(ptr__uninit); 11735 return -EINVAL; 11736 } 11737 11738 bpf_dynptr_init(ptr__uninit, skb, BPF_DYNPTR_TYPE_SKB, 0, skb->len); 11739 11740 return 0; 11741 } 11742 11743 __bpf_kfunc int bpf_dynptr_from_xdp(struct xdp_buff *xdp, u64 flags, 11744 struct bpf_dynptr_kern *ptr__uninit) 11745 { 11746 if (flags) { 11747 bpf_dynptr_set_null(ptr__uninit); 11748 return -EINVAL; 11749 } 11750 11751 bpf_dynptr_init(ptr__uninit, xdp, BPF_DYNPTR_TYPE_XDP, 0, xdp_get_buff_len(xdp)); 11752 11753 return 0; 11754 } 11755 __diag_pop(); 11756 11757 int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags, 11758 struct bpf_dynptr_kern *ptr__uninit) 11759 { 11760 int err; 11761 11762 err = bpf_dynptr_from_skb(skb, flags, ptr__uninit); 11763 if (err) 11764 return err; 11765 11766 bpf_dynptr_set_rdonly(ptr__uninit); 11767 11768 return 0; 11769 } 11770 11771 BTF_SET8_START(bpf_kfunc_check_set_skb) 11772 BTF_ID_FLAGS(func, bpf_dynptr_from_skb) 11773 BTF_SET8_END(bpf_kfunc_check_set_skb) 11774 11775 BTF_SET8_START(bpf_kfunc_check_set_xdp) 11776 BTF_ID_FLAGS(func, bpf_dynptr_from_xdp) 11777 BTF_SET8_END(bpf_kfunc_check_set_xdp) 11778 11779 static const struct btf_kfunc_id_set bpf_kfunc_set_skb = { 11780 .owner = THIS_MODULE, 11781 .set = &bpf_kfunc_check_set_skb, 11782 }; 11783 11784 static const struct btf_kfunc_id_set bpf_kfunc_set_xdp = { 11785 .owner = THIS_MODULE, 11786 .set = &bpf_kfunc_check_set_xdp, 11787 }; 11788 11789 static int __init bpf_kfunc_init(void) 11790 { 11791 int ret; 11792 11793 ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, &bpf_kfunc_set_skb); 11794 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_ACT, &bpf_kfunc_set_skb); 11795 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SK_SKB, &bpf_kfunc_set_skb); 11796 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SOCKET_FILTER, &bpf_kfunc_set_skb); 11797 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_CGROUP_SKB, &bpf_kfunc_set_skb); 11798 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_OUT, &bpf_kfunc_set_skb); 11799 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_IN, &bpf_kfunc_set_skb); 11800 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_XMIT, &bpf_kfunc_set_skb); 11801 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_SEG6LOCAL, &bpf_kfunc_set_skb); 11802 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_NETFILTER, &bpf_kfunc_set_skb); 11803 return ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP, &bpf_kfunc_set_xdp); 11804 } 11805 late_initcall(bpf_kfunc_init); 11806 11807 /* Disables missing prototype warnings */ 11808 __diag_push(); 11809 __diag_ignore_all("-Wmissing-prototypes", 11810 "Global functions as their definitions will be in vmlinux BTF"); 11811 11812 /* bpf_sock_destroy: Destroy the given socket with ECONNABORTED error code. 11813 * 11814 * The function expects a non-NULL pointer to a socket, and invokes the 11815 * protocol specific socket destroy handlers. 11816 * 11817 * The helper can only be called from BPF contexts that have acquired the socket 11818 * locks. 11819 * 11820 * Parameters: 11821 * @sock: Pointer to socket to be destroyed 11822 * 11823 * Return: 11824 * On error, may return EPROTONOSUPPORT, EINVAL. 11825 * EPROTONOSUPPORT if protocol specific destroy handler is not supported. 11826 * 0 otherwise 11827 */ 11828 __bpf_kfunc int bpf_sock_destroy(struct sock_common *sock) 11829 { 11830 struct sock *sk = (struct sock *)sock; 11831 11832 /* The locking semantics that allow for synchronous execution of the 11833 * destroy handlers are only supported for TCP and UDP. 11834 * Supporting protocols will need to acquire sock lock in the BPF context 11835 * prior to invoking this kfunc. 11836 */ 11837 if (!sk->sk_prot->diag_destroy || (sk->sk_protocol != IPPROTO_TCP && 11838 sk->sk_protocol != IPPROTO_UDP)) 11839 return -EOPNOTSUPP; 11840 11841 return sk->sk_prot->diag_destroy(sk, ECONNABORTED); 11842 } 11843 11844 __diag_pop() 11845 11846 BTF_SET8_START(bpf_sk_iter_kfunc_ids) 11847 BTF_ID_FLAGS(func, bpf_sock_destroy, KF_TRUSTED_ARGS) 11848 BTF_SET8_END(bpf_sk_iter_kfunc_ids) 11849 11850 static int tracing_iter_filter(const struct bpf_prog *prog, u32 kfunc_id) 11851 { 11852 if (btf_id_set8_contains(&bpf_sk_iter_kfunc_ids, kfunc_id) && 11853 prog->expected_attach_type != BPF_TRACE_ITER) 11854 return -EACCES; 11855 return 0; 11856 } 11857 11858 static const struct btf_kfunc_id_set bpf_sk_iter_kfunc_set = { 11859 .owner = THIS_MODULE, 11860 .set = &bpf_sk_iter_kfunc_ids, 11861 .filter = tracing_iter_filter, 11862 }; 11863 11864 static int init_subsystem(void) 11865 { 11866 return register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &bpf_sk_iter_kfunc_set); 11867 } 11868 late_initcall(init_subsystem); 11869