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/module.h> 21 #include <linux/types.h> 22 #include <linux/mm.h> 23 #include <linux/fcntl.h> 24 #include <linux/socket.h> 25 #include <linux/sock_diag.h> 26 #include <linux/in.h> 27 #include <linux/inet.h> 28 #include <linux/netdevice.h> 29 #include <linux/if_packet.h> 30 #include <linux/if_arp.h> 31 #include <linux/gfp.h> 32 #include <net/inet_common.h> 33 #include <net/ip.h> 34 #include <net/protocol.h> 35 #include <net/netlink.h> 36 #include <linux/skbuff.h> 37 #include <linux/skmsg.h> 38 #include <net/sock.h> 39 #include <net/flow_dissector.h> 40 #include <linux/errno.h> 41 #include <linux/timer.h> 42 #include <linux/uaccess.h> 43 #include <asm/unaligned.h> 44 #include <asm/cmpxchg.h> 45 #include <linux/filter.h> 46 #include <linux/ratelimit.h> 47 #include <linux/seccomp.h> 48 #include <linux/if_vlan.h> 49 #include <linux/bpf.h> 50 #include <net/sch_generic.h> 51 #include <net/cls_cgroup.h> 52 #include <net/dst_metadata.h> 53 #include <net/dst.h> 54 #include <net/sock_reuseport.h> 55 #include <net/busy_poll.h> 56 #include <net/tcp.h> 57 #include <net/xfrm.h> 58 #include <net/udp.h> 59 #include <linux/bpf_trace.h> 60 #include <net/xdp_sock.h> 61 #include <linux/inetdevice.h> 62 #include <net/inet_hashtables.h> 63 #include <net/inet6_hashtables.h> 64 #include <net/ip_fib.h> 65 #include <net/nexthop.h> 66 #include <net/flow.h> 67 #include <net/arp.h> 68 #include <net/ipv6.h> 69 #include <net/net_namespace.h> 70 #include <linux/seg6_local.h> 71 #include <net/seg6.h> 72 #include <net/seg6_local.h> 73 #include <net/lwtunnel.h> 74 #include <net/ipv6_stubs.h> 75 #include <net/bpf_sk_storage.h> 76 77 /** 78 * sk_filter_trim_cap - run a packet through a socket filter 79 * @sk: sock associated with &sk_buff 80 * @skb: buffer to filter 81 * @cap: limit on how short the eBPF program may trim the packet 82 * 83 * Run the eBPF program and then cut skb->data to correct size returned by 84 * the program. If pkt_len is 0 we toss packet. If skb->len is smaller 85 * than pkt_len we keep whole skb->data. This is the socket level 86 * wrapper to BPF_PROG_RUN. It returns 0 if the packet should 87 * be accepted or -EPERM if the packet should be tossed. 88 * 89 */ 90 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap) 91 { 92 int err; 93 struct sk_filter *filter; 94 95 /* 96 * If the skb was allocated from pfmemalloc reserves, only 97 * allow SOCK_MEMALLOC sockets to use it as this socket is 98 * helping free memory 99 */ 100 if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) { 101 NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP); 102 return -ENOMEM; 103 } 104 err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb); 105 if (err) 106 return err; 107 108 err = security_sock_rcv_skb(sk, skb); 109 if (err) 110 return err; 111 112 rcu_read_lock(); 113 filter = rcu_dereference(sk->sk_filter); 114 if (filter) { 115 struct sock *save_sk = skb->sk; 116 unsigned int pkt_len; 117 118 skb->sk = sk; 119 pkt_len = bpf_prog_run_save_cb(filter->prog, skb); 120 skb->sk = save_sk; 121 err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM; 122 } 123 rcu_read_unlock(); 124 125 return err; 126 } 127 EXPORT_SYMBOL(sk_filter_trim_cap); 128 129 BPF_CALL_1(bpf_skb_get_pay_offset, struct sk_buff *, skb) 130 { 131 return skb_get_poff(skb); 132 } 133 134 BPF_CALL_3(bpf_skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x) 135 { 136 struct nlattr *nla; 137 138 if (skb_is_nonlinear(skb)) 139 return 0; 140 141 if (skb->len < sizeof(struct nlattr)) 142 return 0; 143 144 if (a > skb->len - sizeof(struct nlattr)) 145 return 0; 146 147 nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x); 148 if (nla) 149 return (void *) nla - (void *) skb->data; 150 151 return 0; 152 } 153 154 BPF_CALL_3(bpf_skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x) 155 { 156 struct nlattr *nla; 157 158 if (skb_is_nonlinear(skb)) 159 return 0; 160 161 if (skb->len < sizeof(struct nlattr)) 162 return 0; 163 164 if (a > skb->len - sizeof(struct nlattr)) 165 return 0; 166 167 nla = (struct nlattr *) &skb->data[a]; 168 if (nla->nla_len > skb->len - a) 169 return 0; 170 171 nla = nla_find_nested(nla, x); 172 if (nla) 173 return (void *) nla - (void *) skb->data; 174 175 return 0; 176 } 177 178 BPF_CALL_4(bpf_skb_load_helper_8, const struct sk_buff *, skb, const void *, 179 data, int, headlen, int, offset) 180 { 181 u8 tmp, *ptr; 182 const int len = sizeof(tmp); 183 184 if (offset >= 0) { 185 if (headlen - offset >= len) 186 return *(u8 *)(data + offset); 187 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 188 return tmp; 189 } else { 190 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 191 if (likely(ptr)) 192 return *(u8 *)ptr; 193 } 194 195 return -EFAULT; 196 } 197 198 BPF_CALL_2(bpf_skb_load_helper_8_no_cache, const struct sk_buff *, skb, 199 int, offset) 200 { 201 return ____bpf_skb_load_helper_8(skb, skb->data, skb->len - skb->data_len, 202 offset); 203 } 204 205 BPF_CALL_4(bpf_skb_load_helper_16, const struct sk_buff *, skb, const void *, 206 data, int, headlen, int, offset) 207 { 208 u16 tmp, *ptr; 209 const int len = sizeof(tmp); 210 211 if (offset >= 0) { 212 if (headlen - offset >= len) 213 return get_unaligned_be16(data + offset); 214 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 215 return be16_to_cpu(tmp); 216 } else { 217 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 218 if (likely(ptr)) 219 return get_unaligned_be16(ptr); 220 } 221 222 return -EFAULT; 223 } 224 225 BPF_CALL_2(bpf_skb_load_helper_16_no_cache, const struct sk_buff *, skb, 226 int, offset) 227 { 228 return ____bpf_skb_load_helper_16(skb, skb->data, skb->len - skb->data_len, 229 offset); 230 } 231 232 BPF_CALL_4(bpf_skb_load_helper_32, const struct sk_buff *, skb, const void *, 233 data, int, headlen, int, offset) 234 { 235 u32 tmp, *ptr; 236 const int len = sizeof(tmp); 237 238 if (likely(offset >= 0)) { 239 if (headlen - offset >= len) 240 return get_unaligned_be32(data + offset); 241 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 242 return be32_to_cpu(tmp); 243 } else { 244 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 245 if (likely(ptr)) 246 return get_unaligned_be32(ptr); 247 } 248 249 return -EFAULT; 250 } 251 252 BPF_CALL_2(bpf_skb_load_helper_32_no_cache, const struct sk_buff *, skb, 253 int, offset) 254 { 255 return ____bpf_skb_load_helper_32(skb, skb->data, skb->len - skb->data_len, 256 offset); 257 } 258 259 BPF_CALL_0(bpf_get_raw_cpu_id) 260 { 261 return raw_smp_processor_id(); 262 } 263 264 static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto = { 265 .func = bpf_get_raw_cpu_id, 266 .gpl_only = false, 267 .ret_type = RET_INTEGER, 268 }; 269 270 static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg, 271 struct bpf_insn *insn_buf) 272 { 273 struct bpf_insn *insn = insn_buf; 274 275 switch (skb_field) { 276 case SKF_AD_MARK: 277 BUILD_BUG_ON(sizeof_field(struct sk_buff, mark) != 4); 278 279 *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg, 280 offsetof(struct sk_buff, mark)); 281 break; 282 283 case SKF_AD_PKTTYPE: 284 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET()); 285 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX); 286 #ifdef __BIG_ENDIAN_BITFIELD 287 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5); 288 #endif 289 break; 290 291 case SKF_AD_QUEUE: 292 BUILD_BUG_ON(sizeof_field(struct sk_buff, queue_mapping) != 2); 293 294 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, 295 offsetof(struct sk_buff, queue_mapping)); 296 break; 297 298 case SKF_AD_VLAN_TAG: 299 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_tci) != 2); 300 301 /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */ 302 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, 303 offsetof(struct sk_buff, vlan_tci)); 304 break; 305 case SKF_AD_VLAN_TAG_PRESENT: 306 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_VLAN_PRESENT_OFFSET()); 307 if (PKT_VLAN_PRESENT_BIT) 308 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, PKT_VLAN_PRESENT_BIT); 309 if (PKT_VLAN_PRESENT_BIT < 7) 310 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, 1); 311 break; 312 } 313 314 return insn - insn_buf; 315 } 316 317 static bool convert_bpf_extensions(struct sock_filter *fp, 318 struct bpf_insn **insnp) 319 { 320 struct bpf_insn *insn = *insnp; 321 u32 cnt; 322 323 switch (fp->k) { 324 case SKF_AD_OFF + SKF_AD_PROTOCOL: 325 BUILD_BUG_ON(sizeof_field(struct sk_buff, protocol) != 2); 326 327 /* A = *(u16 *) (CTX + offsetof(protocol)) */ 328 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, 329 offsetof(struct sk_buff, protocol)); 330 /* A = ntohs(A) [emitting a nop or swap16] */ 331 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); 332 break; 333 334 case SKF_AD_OFF + SKF_AD_PKTTYPE: 335 cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn); 336 insn += cnt - 1; 337 break; 338 339 case SKF_AD_OFF + SKF_AD_IFINDEX: 340 case SKF_AD_OFF + SKF_AD_HATYPE: 341 BUILD_BUG_ON(sizeof_field(struct net_device, ifindex) != 4); 342 BUILD_BUG_ON(sizeof_field(struct net_device, type) != 2); 343 344 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 345 BPF_REG_TMP, BPF_REG_CTX, 346 offsetof(struct sk_buff, dev)); 347 /* if (tmp != 0) goto pc + 1 */ 348 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1); 349 *insn++ = BPF_EXIT_INSN(); 350 if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX) 351 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP, 352 offsetof(struct net_device, ifindex)); 353 else 354 *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP, 355 offsetof(struct net_device, type)); 356 break; 357 358 case SKF_AD_OFF + SKF_AD_MARK: 359 cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn); 360 insn += cnt - 1; 361 break; 362 363 case SKF_AD_OFF + SKF_AD_RXHASH: 364 BUILD_BUG_ON(sizeof_field(struct sk_buff, hash) != 4); 365 366 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, 367 offsetof(struct sk_buff, hash)); 368 break; 369 370 case SKF_AD_OFF + SKF_AD_QUEUE: 371 cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn); 372 insn += cnt - 1; 373 break; 374 375 case SKF_AD_OFF + SKF_AD_VLAN_TAG: 376 cnt = convert_skb_access(SKF_AD_VLAN_TAG, 377 BPF_REG_A, BPF_REG_CTX, insn); 378 insn += cnt - 1; 379 break; 380 381 case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT: 382 cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT, 383 BPF_REG_A, BPF_REG_CTX, insn); 384 insn += cnt - 1; 385 break; 386 387 case SKF_AD_OFF + SKF_AD_VLAN_TPID: 388 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_proto) != 2); 389 390 /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */ 391 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, 392 offsetof(struct sk_buff, vlan_proto)); 393 /* A = ntohs(A) [emitting a nop or swap16] */ 394 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); 395 break; 396 397 case SKF_AD_OFF + SKF_AD_PAY_OFFSET: 398 case SKF_AD_OFF + SKF_AD_NLATTR: 399 case SKF_AD_OFF + SKF_AD_NLATTR_NEST: 400 case SKF_AD_OFF + SKF_AD_CPU: 401 case SKF_AD_OFF + SKF_AD_RANDOM: 402 /* arg1 = CTX */ 403 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); 404 /* arg2 = A */ 405 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A); 406 /* arg3 = X */ 407 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X); 408 /* Emit call(arg1=CTX, arg2=A, arg3=X) */ 409 switch (fp->k) { 410 case SKF_AD_OFF + SKF_AD_PAY_OFFSET: 411 *insn = BPF_EMIT_CALL(bpf_skb_get_pay_offset); 412 break; 413 case SKF_AD_OFF + SKF_AD_NLATTR: 414 *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr); 415 break; 416 case SKF_AD_OFF + SKF_AD_NLATTR_NEST: 417 *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr_nest); 418 break; 419 case SKF_AD_OFF + SKF_AD_CPU: 420 *insn = BPF_EMIT_CALL(bpf_get_raw_cpu_id); 421 break; 422 case SKF_AD_OFF + SKF_AD_RANDOM: 423 *insn = BPF_EMIT_CALL(bpf_user_rnd_u32); 424 bpf_user_rnd_init_once(); 425 break; 426 } 427 break; 428 429 case SKF_AD_OFF + SKF_AD_ALU_XOR_X: 430 /* A ^= X */ 431 *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X); 432 break; 433 434 default: 435 /* This is just a dummy call to avoid letting the compiler 436 * evict __bpf_call_base() as an optimization. Placed here 437 * where no-one bothers. 438 */ 439 BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0); 440 return false; 441 } 442 443 *insnp = insn; 444 return true; 445 } 446 447 static bool convert_bpf_ld_abs(struct sock_filter *fp, struct bpf_insn **insnp) 448 { 449 const bool unaligned_ok = IS_BUILTIN(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS); 450 int size = bpf_size_to_bytes(BPF_SIZE(fp->code)); 451 bool endian = BPF_SIZE(fp->code) == BPF_H || 452 BPF_SIZE(fp->code) == BPF_W; 453 bool indirect = BPF_MODE(fp->code) == BPF_IND; 454 const int ip_align = NET_IP_ALIGN; 455 struct bpf_insn *insn = *insnp; 456 int offset = fp->k; 457 458 if (!indirect && 459 ((unaligned_ok && offset >= 0) || 460 (!unaligned_ok && offset >= 0 && 461 offset + ip_align >= 0 && 462 offset + ip_align % size == 0))) { 463 bool ldx_off_ok = offset <= S16_MAX; 464 465 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_H); 466 if (offset) 467 *insn++ = BPF_ALU64_IMM(BPF_SUB, BPF_REG_TMP, offset); 468 *insn++ = BPF_JMP_IMM(BPF_JSLT, BPF_REG_TMP, 469 size, 2 + endian + (!ldx_off_ok * 2)); 470 if (ldx_off_ok) { 471 *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, 472 BPF_REG_D, offset); 473 } else { 474 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_D); 475 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_TMP, offset); 476 *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, 477 BPF_REG_TMP, 0); 478 } 479 if (endian) 480 *insn++ = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, size * 8); 481 *insn++ = BPF_JMP_A(8); 482 } 483 484 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); 485 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_D); 486 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_H); 487 if (!indirect) { 488 *insn++ = BPF_MOV64_IMM(BPF_REG_ARG4, offset); 489 } else { 490 *insn++ = BPF_MOV64_REG(BPF_REG_ARG4, BPF_REG_X); 491 if (fp->k) 492 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_ARG4, offset); 493 } 494 495 switch (BPF_SIZE(fp->code)) { 496 case BPF_B: 497 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8); 498 break; 499 case BPF_H: 500 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16); 501 break; 502 case BPF_W: 503 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32); 504 break; 505 default: 506 return false; 507 } 508 509 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_A, 0, 2); 510 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 511 *insn = BPF_EXIT_INSN(); 512 513 *insnp = insn; 514 return true; 515 } 516 517 /** 518 * bpf_convert_filter - convert filter program 519 * @prog: the user passed filter program 520 * @len: the length of the user passed filter program 521 * @new_prog: allocated 'struct bpf_prog' or NULL 522 * @new_len: pointer to store length of converted program 523 * @seen_ld_abs: bool whether we've seen ld_abs/ind 524 * 525 * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn' 526 * style extended BPF (eBPF). 527 * Conversion workflow: 528 * 529 * 1) First pass for calculating the new program length: 530 * bpf_convert_filter(old_prog, old_len, NULL, &new_len, &seen_ld_abs) 531 * 532 * 2) 2nd pass to remap in two passes: 1st pass finds new 533 * jump offsets, 2nd pass remapping: 534 * bpf_convert_filter(old_prog, old_len, new_prog, &new_len, &seen_ld_abs) 535 */ 536 static int bpf_convert_filter(struct sock_filter *prog, int len, 537 struct bpf_prog *new_prog, int *new_len, 538 bool *seen_ld_abs) 539 { 540 int new_flen = 0, pass = 0, target, i, stack_off; 541 struct bpf_insn *new_insn, *first_insn = NULL; 542 struct sock_filter *fp; 543 int *addrs = NULL; 544 u8 bpf_src; 545 546 BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK); 547 BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG); 548 549 if (len <= 0 || len > BPF_MAXINSNS) 550 return -EINVAL; 551 552 if (new_prog) { 553 first_insn = new_prog->insnsi; 554 addrs = kcalloc(len, sizeof(*addrs), 555 GFP_KERNEL | __GFP_NOWARN); 556 if (!addrs) 557 return -ENOMEM; 558 } 559 560 do_pass: 561 new_insn = first_insn; 562 fp = prog; 563 564 /* Classic BPF related prologue emission. */ 565 if (new_prog) { 566 /* Classic BPF expects A and X to be reset first. These need 567 * to be guaranteed to be the first two instructions. 568 */ 569 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 570 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_X, BPF_REG_X); 571 572 /* All programs must keep CTX in callee saved BPF_REG_CTX. 573 * In eBPF case it's done by the compiler, here we need to 574 * do this ourself. Initial CTX is present in BPF_REG_ARG1. 575 */ 576 *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1); 577 if (*seen_ld_abs) { 578 /* For packet access in classic BPF, cache skb->data 579 * in callee-saved BPF R8 and skb->len - skb->data_len 580 * (headlen) in BPF R9. Since classic BPF is read-only 581 * on CTX, we only need to cache it once. 582 */ 583 *new_insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 584 BPF_REG_D, BPF_REG_CTX, 585 offsetof(struct sk_buff, data)); 586 *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_H, BPF_REG_CTX, 587 offsetof(struct sk_buff, len)); 588 *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_TMP, BPF_REG_CTX, 589 offsetof(struct sk_buff, data_len)); 590 *new_insn++ = BPF_ALU32_REG(BPF_SUB, BPF_REG_H, BPF_REG_TMP); 591 } 592 } else { 593 new_insn += 3; 594 } 595 596 for (i = 0; i < len; fp++, i++) { 597 struct bpf_insn tmp_insns[32] = { }; 598 struct bpf_insn *insn = tmp_insns; 599 600 if (addrs) 601 addrs[i] = new_insn - first_insn; 602 603 switch (fp->code) { 604 /* All arithmetic insns and skb loads map as-is. */ 605 case BPF_ALU | BPF_ADD | BPF_X: 606 case BPF_ALU | BPF_ADD | BPF_K: 607 case BPF_ALU | BPF_SUB | BPF_X: 608 case BPF_ALU | BPF_SUB | BPF_K: 609 case BPF_ALU | BPF_AND | BPF_X: 610 case BPF_ALU | BPF_AND | BPF_K: 611 case BPF_ALU | BPF_OR | BPF_X: 612 case BPF_ALU | BPF_OR | BPF_K: 613 case BPF_ALU | BPF_LSH | BPF_X: 614 case BPF_ALU | BPF_LSH | BPF_K: 615 case BPF_ALU | BPF_RSH | BPF_X: 616 case BPF_ALU | BPF_RSH | BPF_K: 617 case BPF_ALU | BPF_XOR | BPF_X: 618 case BPF_ALU | BPF_XOR | BPF_K: 619 case BPF_ALU | BPF_MUL | BPF_X: 620 case BPF_ALU | BPF_MUL | BPF_K: 621 case BPF_ALU | BPF_DIV | BPF_X: 622 case BPF_ALU | BPF_DIV | BPF_K: 623 case BPF_ALU | BPF_MOD | BPF_X: 624 case BPF_ALU | BPF_MOD | BPF_K: 625 case BPF_ALU | BPF_NEG: 626 case BPF_LD | BPF_ABS | BPF_W: 627 case BPF_LD | BPF_ABS | BPF_H: 628 case BPF_LD | BPF_ABS | BPF_B: 629 case BPF_LD | BPF_IND | BPF_W: 630 case BPF_LD | BPF_IND | BPF_H: 631 case BPF_LD | BPF_IND | BPF_B: 632 /* Check for overloaded BPF extension and 633 * directly convert it if found, otherwise 634 * just move on with mapping. 635 */ 636 if (BPF_CLASS(fp->code) == BPF_LD && 637 BPF_MODE(fp->code) == BPF_ABS && 638 convert_bpf_extensions(fp, &insn)) 639 break; 640 if (BPF_CLASS(fp->code) == BPF_LD && 641 convert_bpf_ld_abs(fp, &insn)) { 642 *seen_ld_abs = true; 643 break; 644 } 645 646 if (fp->code == (BPF_ALU | BPF_DIV | BPF_X) || 647 fp->code == (BPF_ALU | BPF_MOD | BPF_X)) { 648 *insn++ = BPF_MOV32_REG(BPF_REG_X, BPF_REG_X); 649 /* Error with exception code on div/mod by 0. 650 * For cBPF programs, this was always return 0. 651 */ 652 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_X, 0, 2); 653 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 654 *insn++ = BPF_EXIT_INSN(); 655 } 656 657 *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k); 658 break; 659 660 /* Jump transformation cannot use BPF block macros 661 * everywhere as offset calculation and target updates 662 * require a bit more work than the rest, i.e. jump 663 * opcodes map as-is, but offsets need adjustment. 664 */ 665 666 #define BPF_EMIT_JMP \ 667 do { \ 668 const s32 off_min = S16_MIN, off_max = S16_MAX; \ 669 s32 off; \ 670 \ 671 if (target >= len || target < 0) \ 672 goto err; \ 673 off = addrs ? addrs[target] - addrs[i] - 1 : 0; \ 674 /* Adjust pc relative offset for 2nd or 3rd insn. */ \ 675 off -= insn - tmp_insns; \ 676 /* Reject anything not fitting into insn->off. */ \ 677 if (off < off_min || off > off_max) \ 678 goto err; \ 679 insn->off = off; \ 680 } while (0) 681 682 case BPF_JMP | BPF_JA: 683 target = i + fp->k + 1; 684 insn->code = fp->code; 685 BPF_EMIT_JMP; 686 break; 687 688 case BPF_JMP | BPF_JEQ | BPF_K: 689 case BPF_JMP | BPF_JEQ | BPF_X: 690 case BPF_JMP | BPF_JSET | BPF_K: 691 case BPF_JMP | BPF_JSET | BPF_X: 692 case BPF_JMP | BPF_JGT | BPF_K: 693 case BPF_JMP | BPF_JGT | BPF_X: 694 case BPF_JMP | BPF_JGE | BPF_K: 695 case BPF_JMP | BPF_JGE | BPF_X: 696 if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) { 697 /* BPF immediates are signed, zero extend 698 * immediate into tmp register and use it 699 * in compare insn. 700 */ 701 *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k); 702 703 insn->dst_reg = BPF_REG_A; 704 insn->src_reg = BPF_REG_TMP; 705 bpf_src = BPF_X; 706 } else { 707 insn->dst_reg = BPF_REG_A; 708 insn->imm = fp->k; 709 bpf_src = BPF_SRC(fp->code); 710 insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0; 711 } 712 713 /* Common case where 'jump_false' is next insn. */ 714 if (fp->jf == 0) { 715 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; 716 target = i + fp->jt + 1; 717 BPF_EMIT_JMP; 718 break; 719 } 720 721 /* Convert some jumps when 'jump_true' is next insn. */ 722 if (fp->jt == 0) { 723 switch (BPF_OP(fp->code)) { 724 case BPF_JEQ: 725 insn->code = BPF_JMP | BPF_JNE | bpf_src; 726 break; 727 case BPF_JGT: 728 insn->code = BPF_JMP | BPF_JLE | bpf_src; 729 break; 730 case BPF_JGE: 731 insn->code = BPF_JMP | BPF_JLT | bpf_src; 732 break; 733 default: 734 goto jmp_rest; 735 } 736 737 target = i + fp->jf + 1; 738 BPF_EMIT_JMP; 739 break; 740 } 741 jmp_rest: 742 /* Other jumps are mapped into two insns: Jxx and JA. */ 743 target = i + fp->jt + 1; 744 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; 745 BPF_EMIT_JMP; 746 insn++; 747 748 insn->code = BPF_JMP | BPF_JA; 749 target = i + fp->jf + 1; 750 BPF_EMIT_JMP; 751 break; 752 753 /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */ 754 case BPF_LDX | BPF_MSH | BPF_B: { 755 struct sock_filter tmp = { 756 .code = BPF_LD | BPF_ABS | BPF_B, 757 .k = fp->k, 758 }; 759 760 *seen_ld_abs = true; 761 762 /* X = A */ 763 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 764 /* A = BPF_R0 = *(u8 *) (skb->data + K) */ 765 convert_bpf_ld_abs(&tmp, &insn); 766 insn++; 767 /* A &= 0xf */ 768 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf); 769 /* A <<= 2 */ 770 *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2); 771 /* tmp = X */ 772 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_X); 773 /* X = A */ 774 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 775 /* A = tmp */ 776 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP); 777 break; 778 } 779 /* RET_K is remaped into 2 insns. RET_A case doesn't need an 780 * extra mov as BPF_REG_0 is already mapped into BPF_REG_A. 781 */ 782 case BPF_RET | BPF_A: 783 case BPF_RET | BPF_K: 784 if (BPF_RVAL(fp->code) == BPF_K) 785 *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0, 786 0, fp->k); 787 *insn = BPF_EXIT_INSN(); 788 break; 789 790 /* Store to stack. */ 791 case BPF_ST: 792 case BPF_STX: 793 stack_off = fp->k * 4 + 4; 794 *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) == 795 BPF_ST ? BPF_REG_A : BPF_REG_X, 796 -stack_off); 797 /* check_load_and_stores() verifies that classic BPF can 798 * load from stack only after write, so tracking 799 * stack_depth for ST|STX insns is enough 800 */ 801 if (new_prog && new_prog->aux->stack_depth < stack_off) 802 new_prog->aux->stack_depth = stack_off; 803 break; 804 805 /* Load from stack. */ 806 case BPF_LD | BPF_MEM: 807 case BPF_LDX | BPF_MEM: 808 stack_off = fp->k * 4 + 4; 809 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? 810 BPF_REG_A : BPF_REG_X, BPF_REG_FP, 811 -stack_off); 812 break; 813 814 /* A = K or X = K */ 815 case BPF_LD | BPF_IMM: 816 case BPF_LDX | BPF_IMM: 817 *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ? 818 BPF_REG_A : BPF_REG_X, fp->k); 819 break; 820 821 /* X = A */ 822 case BPF_MISC | BPF_TAX: 823 *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 824 break; 825 826 /* A = X */ 827 case BPF_MISC | BPF_TXA: 828 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X); 829 break; 830 831 /* A = skb->len or X = skb->len */ 832 case BPF_LD | BPF_W | BPF_LEN: 833 case BPF_LDX | BPF_W | BPF_LEN: 834 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? 835 BPF_REG_A : BPF_REG_X, BPF_REG_CTX, 836 offsetof(struct sk_buff, len)); 837 break; 838 839 /* Access seccomp_data fields. */ 840 case BPF_LDX | BPF_ABS | BPF_W: 841 /* A = *(u32 *) (ctx + K) */ 842 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k); 843 break; 844 845 /* Unknown instruction. */ 846 default: 847 goto err; 848 } 849 850 insn++; 851 if (new_prog) 852 memcpy(new_insn, tmp_insns, 853 sizeof(*insn) * (insn - tmp_insns)); 854 new_insn += insn - tmp_insns; 855 } 856 857 if (!new_prog) { 858 /* Only calculating new length. */ 859 *new_len = new_insn - first_insn; 860 if (*seen_ld_abs) 861 *new_len += 4; /* Prologue bits. */ 862 return 0; 863 } 864 865 pass++; 866 if (new_flen != new_insn - first_insn) { 867 new_flen = new_insn - first_insn; 868 if (pass > 2) 869 goto err; 870 goto do_pass; 871 } 872 873 kfree(addrs); 874 BUG_ON(*new_len != new_flen); 875 return 0; 876 err: 877 kfree(addrs); 878 return -EINVAL; 879 } 880 881 /* Security: 882 * 883 * As we dont want to clear mem[] array for each packet going through 884 * __bpf_prog_run(), we check that filter loaded by user never try to read 885 * a cell if not previously written, and we check all branches to be sure 886 * a malicious user doesn't try to abuse us. 887 */ 888 static int check_load_and_stores(const struct sock_filter *filter, int flen) 889 { 890 u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */ 891 int pc, ret = 0; 892 893 BUILD_BUG_ON(BPF_MEMWORDS > 16); 894 895 masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL); 896 if (!masks) 897 return -ENOMEM; 898 899 memset(masks, 0xff, flen * sizeof(*masks)); 900 901 for (pc = 0; pc < flen; pc++) { 902 memvalid &= masks[pc]; 903 904 switch (filter[pc].code) { 905 case BPF_ST: 906 case BPF_STX: 907 memvalid |= (1 << filter[pc].k); 908 break; 909 case BPF_LD | BPF_MEM: 910 case BPF_LDX | BPF_MEM: 911 if (!(memvalid & (1 << filter[pc].k))) { 912 ret = -EINVAL; 913 goto error; 914 } 915 break; 916 case BPF_JMP | BPF_JA: 917 /* A jump must set masks on target */ 918 masks[pc + 1 + filter[pc].k] &= memvalid; 919 memvalid = ~0; 920 break; 921 case BPF_JMP | BPF_JEQ | BPF_K: 922 case BPF_JMP | BPF_JEQ | BPF_X: 923 case BPF_JMP | BPF_JGE | BPF_K: 924 case BPF_JMP | BPF_JGE | BPF_X: 925 case BPF_JMP | BPF_JGT | BPF_K: 926 case BPF_JMP | BPF_JGT | BPF_X: 927 case BPF_JMP | BPF_JSET | BPF_K: 928 case BPF_JMP | BPF_JSET | BPF_X: 929 /* A jump must set masks on targets */ 930 masks[pc + 1 + filter[pc].jt] &= memvalid; 931 masks[pc + 1 + filter[pc].jf] &= memvalid; 932 memvalid = ~0; 933 break; 934 } 935 } 936 error: 937 kfree(masks); 938 return ret; 939 } 940 941 static bool chk_code_allowed(u16 code_to_probe) 942 { 943 static const bool codes[] = { 944 /* 32 bit ALU operations */ 945 [BPF_ALU | BPF_ADD | BPF_K] = true, 946 [BPF_ALU | BPF_ADD | BPF_X] = true, 947 [BPF_ALU | BPF_SUB | BPF_K] = true, 948 [BPF_ALU | BPF_SUB | BPF_X] = true, 949 [BPF_ALU | BPF_MUL | BPF_K] = true, 950 [BPF_ALU | BPF_MUL | BPF_X] = true, 951 [BPF_ALU | BPF_DIV | BPF_K] = true, 952 [BPF_ALU | BPF_DIV | BPF_X] = true, 953 [BPF_ALU | BPF_MOD | BPF_K] = true, 954 [BPF_ALU | BPF_MOD | BPF_X] = true, 955 [BPF_ALU | BPF_AND | BPF_K] = true, 956 [BPF_ALU | BPF_AND | BPF_X] = true, 957 [BPF_ALU | BPF_OR | BPF_K] = true, 958 [BPF_ALU | BPF_OR | BPF_X] = true, 959 [BPF_ALU | BPF_XOR | BPF_K] = true, 960 [BPF_ALU | BPF_XOR | BPF_X] = true, 961 [BPF_ALU | BPF_LSH | BPF_K] = true, 962 [BPF_ALU | BPF_LSH | BPF_X] = true, 963 [BPF_ALU | BPF_RSH | BPF_K] = true, 964 [BPF_ALU | BPF_RSH | BPF_X] = true, 965 [BPF_ALU | BPF_NEG] = true, 966 /* Load instructions */ 967 [BPF_LD | BPF_W | BPF_ABS] = true, 968 [BPF_LD | BPF_H | BPF_ABS] = true, 969 [BPF_LD | BPF_B | BPF_ABS] = true, 970 [BPF_LD | BPF_W | BPF_LEN] = true, 971 [BPF_LD | BPF_W | BPF_IND] = true, 972 [BPF_LD | BPF_H | BPF_IND] = true, 973 [BPF_LD | BPF_B | BPF_IND] = true, 974 [BPF_LD | BPF_IMM] = true, 975 [BPF_LD | BPF_MEM] = true, 976 [BPF_LDX | BPF_W | BPF_LEN] = true, 977 [BPF_LDX | BPF_B | BPF_MSH] = true, 978 [BPF_LDX | BPF_IMM] = true, 979 [BPF_LDX | BPF_MEM] = true, 980 /* Store instructions */ 981 [BPF_ST] = true, 982 [BPF_STX] = true, 983 /* Misc instructions */ 984 [BPF_MISC | BPF_TAX] = true, 985 [BPF_MISC | BPF_TXA] = true, 986 /* Return instructions */ 987 [BPF_RET | BPF_K] = true, 988 [BPF_RET | BPF_A] = true, 989 /* Jump instructions */ 990 [BPF_JMP | BPF_JA] = true, 991 [BPF_JMP | BPF_JEQ | BPF_K] = true, 992 [BPF_JMP | BPF_JEQ | BPF_X] = true, 993 [BPF_JMP | BPF_JGE | BPF_K] = true, 994 [BPF_JMP | BPF_JGE | BPF_X] = true, 995 [BPF_JMP | BPF_JGT | BPF_K] = true, 996 [BPF_JMP | BPF_JGT | BPF_X] = true, 997 [BPF_JMP | BPF_JSET | BPF_K] = true, 998 [BPF_JMP | BPF_JSET | BPF_X] = true, 999 }; 1000 1001 if (code_to_probe >= ARRAY_SIZE(codes)) 1002 return false; 1003 1004 return codes[code_to_probe]; 1005 } 1006 1007 static bool bpf_check_basics_ok(const struct sock_filter *filter, 1008 unsigned int flen) 1009 { 1010 if (filter == NULL) 1011 return false; 1012 if (flen == 0 || flen > BPF_MAXINSNS) 1013 return false; 1014 1015 return true; 1016 } 1017 1018 /** 1019 * bpf_check_classic - verify socket filter code 1020 * @filter: filter to verify 1021 * @flen: length of filter 1022 * 1023 * Check the user's filter code. If we let some ugly 1024 * filter code slip through kaboom! The filter must contain 1025 * no references or jumps that are out of range, no illegal 1026 * instructions, and must end with a RET instruction. 1027 * 1028 * All jumps are forward as they are not signed. 1029 * 1030 * Returns 0 if the rule set is legal or -EINVAL if not. 1031 */ 1032 static int bpf_check_classic(const struct sock_filter *filter, 1033 unsigned int flen) 1034 { 1035 bool anc_found; 1036 int pc; 1037 1038 /* Check the filter code now */ 1039 for (pc = 0; pc < flen; pc++) { 1040 const struct sock_filter *ftest = &filter[pc]; 1041 1042 /* May we actually operate on this code? */ 1043 if (!chk_code_allowed(ftest->code)) 1044 return -EINVAL; 1045 1046 /* Some instructions need special checks */ 1047 switch (ftest->code) { 1048 case BPF_ALU | BPF_DIV | BPF_K: 1049 case BPF_ALU | BPF_MOD | BPF_K: 1050 /* Check for division by zero */ 1051 if (ftest->k == 0) 1052 return -EINVAL; 1053 break; 1054 case BPF_ALU | BPF_LSH | BPF_K: 1055 case BPF_ALU | BPF_RSH | BPF_K: 1056 if (ftest->k >= 32) 1057 return -EINVAL; 1058 break; 1059 case BPF_LD | BPF_MEM: 1060 case BPF_LDX | BPF_MEM: 1061 case BPF_ST: 1062 case BPF_STX: 1063 /* Check for invalid memory addresses */ 1064 if (ftest->k >= BPF_MEMWORDS) 1065 return -EINVAL; 1066 break; 1067 case BPF_JMP | BPF_JA: 1068 /* Note, the large ftest->k might cause loops. 1069 * Compare this with conditional jumps below, 1070 * where offsets are limited. --ANK (981016) 1071 */ 1072 if (ftest->k >= (unsigned int)(flen - pc - 1)) 1073 return -EINVAL; 1074 break; 1075 case BPF_JMP | BPF_JEQ | BPF_K: 1076 case BPF_JMP | BPF_JEQ | BPF_X: 1077 case BPF_JMP | BPF_JGE | BPF_K: 1078 case BPF_JMP | BPF_JGE | BPF_X: 1079 case BPF_JMP | BPF_JGT | BPF_K: 1080 case BPF_JMP | BPF_JGT | BPF_X: 1081 case BPF_JMP | BPF_JSET | BPF_K: 1082 case BPF_JMP | BPF_JSET | BPF_X: 1083 /* Both conditionals must be safe */ 1084 if (pc + ftest->jt + 1 >= flen || 1085 pc + ftest->jf + 1 >= flen) 1086 return -EINVAL; 1087 break; 1088 case BPF_LD | BPF_W | BPF_ABS: 1089 case BPF_LD | BPF_H | BPF_ABS: 1090 case BPF_LD | BPF_B | BPF_ABS: 1091 anc_found = false; 1092 if (bpf_anc_helper(ftest) & BPF_ANC) 1093 anc_found = true; 1094 /* Ancillary operation unknown or unsupported */ 1095 if (anc_found == false && ftest->k >= SKF_AD_OFF) 1096 return -EINVAL; 1097 } 1098 } 1099 1100 /* Last instruction must be a RET code */ 1101 switch (filter[flen - 1].code) { 1102 case BPF_RET | BPF_K: 1103 case BPF_RET | BPF_A: 1104 return check_load_and_stores(filter, flen); 1105 } 1106 1107 return -EINVAL; 1108 } 1109 1110 static int bpf_prog_store_orig_filter(struct bpf_prog *fp, 1111 const struct sock_fprog *fprog) 1112 { 1113 unsigned int fsize = bpf_classic_proglen(fprog); 1114 struct sock_fprog_kern *fkprog; 1115 1116 fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL); 1117 if (!fp->orig_prog) 1118 return -ENOMEM; 1119 1120 fkprog = fp->orig_prog; 1121 fkprog->len = fprog->len; 1122 1123 fkprog->filter = kmemdup(fp->insns, fsize, 1124 GFP_KERNEL | __GFP_NOWARN); 1125 if (!fkprog->filter) { 1126 kfree(fp->orig_prog); 1127 return -ENOMEM; 1128 } 1129 1130 return 0; 1131 } 1132 1133 static void bpf_release_orig_filter(struct bpf_prog *fp) 1134 { 1135 struct sock_fprog_kern *fprog = fp->orig_prog; 1136 1137 if (fprog) { 1138 kfree(fprog->filter); 1139 kfree(fprog); 1140 } 1141 } 1142 1143 static void __bpf_prog_release(struct bpf_prog *prog) 1144 { 1145 if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) { 1146 bpf_prog_put(prog); 1147 } else { 1148 bpf_release_orig_filter(prog); 1149 bpf_prog_free(prog); 1150 } 1151 } 1152 1153 static void __sk_filter_release(struct sk_filter *fp) 1154 { 1155 __bpf_prog_release(fp->prog); 1156 kfree(fp); 1157 } 1158 1159 /** 1160 * sk_filter_release_rcu - Release a socket filter by rcu_head 1161 * @rcu: rcu_head that contains the sk_filter to free 1162 */ 1163 static void sk_filter_release_rcu(struct rcu_head *rcu) 1164 { 1165 struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu); 1166 1167 __sk_filter_release(fp); 1168 } 1169 1170 /** 1171 * sk_filter_release - release a socket filter 1172 * @fp: filter to remove 1173 * 1174 * Remove a filter from a socket and release its resources. 1175 */ 1176 static void sk_filter_release(struct sk_filter *fp) 1177 { 1178 if (refcount_dec_and_test(&fp->refcnt)) 1179 call_rcu(&fp->rcu, sk_filter_release_rcu); 1180 } 1181 1182 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) 1183 { 1184 u32 filter_size = bpf_prog_size(fp->prog->len); 1185 1186 atomic_sub(filter_size, &sk->sk_omem_alloc); 1187 sk_filter_release(fp); 1188 } 1189 1190 /* try to charge the socket memory if there is space available 1191 * return true on success 1192 */ 1193 static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp) 1194 { 1195 u32 filter_size = bpf_prog_size(fp->prog->len); 1196 1197 /* same check as in sock_kmalloc() */ 1198 if (filter_size <= sysctl_optmem_max && 1199 atomic_read(&sk->sk_omem_alloc) + filter_size < sysctl_optmem_max) { 1200 atomic_add(filter_size, &sk->sk_omem_alloc); 1201 return true; 1202 } 1203 return false; 1204 } 1205 1206 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp) 1207 { 1208 if (!refcount_inc_not_zero(&fp->refcnt)) 1209 return false; 1210 1211 if (!__sk_filter_charge(sk, fp)) { 1212 sk_filter_release(fp); 1213 return false; 1214 } 1215 return true; 1216 } 1217 1218 static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp) 1219 { 1220 struct sock_filter *old_prog; 1221 struct bpf_prog *old_fp; 1222 int err, new_len, old_len = fp->len; 1223 bool seen_ld_abs = false; 1224 1225 /* We are free to overwrite insns et al right here as it 1226 * won't be used at this point in time anymore internally 1227 * after the migration to the internal BPF instruction 1228 * representation. 1229 */ 1230 BUILD_BUG_ON(sizeof(struct sock_filter) != 1231 sizeof(struct bpf_insn)); 1232 1233 /* Conversion cannot happen on overlapping memory areas, 1234 * so we need to keep the user BPF around until the 2nd 1235 * pass. At this time, the user BPF is stored in fp->insns. 1236 */ 1237 old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter), 1238 GFP_KERNEL | __GFP_NOWARN); 1239 if (!old_prog) { 1240 err = -ENOMEM; 1241 goto out_err; 1242 } 1243 1244 /* 1st pass: calculate the new program length. */ 1245 err = bpf_convert_filter(old_prog, old_len, NULL, &new_len, 1246 &seen_ld_abs); 1247 if (err) 1248 goto out_err_free; 1249 1250 /* Expand fp for appending the new filter representation. */ 1251 old_fp = fp; 1252 fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0); 1253 if (!fp) { 1254 /* The old_fp is still around in case we couldn't 1255 * allocate new memory, so uncharge on that one. 1256 */ 1257 fp = old_fp; 1258 err = -ENOMEM; 1259 goto out_err_free; 1260 } 1261 1262 fp->len = new_len; 1263 1264 /* 2nd pass: remap sock_filter insns into bpf_insn insns. */ 1265 err = bpf_convert_filter(old_prog, old_len, fp, &new_len, 1266 &seen_ld_abs); 1267 if (err) 1268 /* 2nd bpf_convert_filter() can fail only if it fails 1269 * to allocate memory, remapping must succeed. Note, 1270 * that at this time old_fp has already been released 1271 * by krealloc(). 1272 */ 1273 goto out_err_free; 1274 1275 fp = bpf_prog_select_runtime(fp, &err); 1276 if (err) 1277 goto out_err_free; 1278 1279 kfree(old_prog); 1280 return fp; 1281 1282 out_err_free: 1283 kfree(old_prog); 1284 out_err: 1285 __bpf_prog_release(fp); 1286 return ERR_PTR(err); 1287 } 1288 1289 static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp, 1290 bpf_aux_classic_check_t trans) 1291 { 1292 int err; 1293 1294 fp->bpf_func = NULL; 1295 fp->jited = 0; 1296 1297 err = bpf_check_classic(fp->insns, fp->len); 1298 if (err) { 1299 __bpf_prog_release(fp); 1300 return ERR_PTR(err); 1301 } 1302 1303 /* There might be additional checks and transformations 1304 * needed on classic filters, f.e. in case of seccomp. 1305 */ 1306 if (trans) { 1307 err = trans(fp->insns, fp->len); 1308 if (err) { 1309 __bpf_prog_release(fp); 1310 return ERR_PTR(err); 1311 } 1312 } 1313 1314 /* Probe if we can JIT compile the filter and if so, do 1315 * the compilation of the filter. 1316 */ 1317 bpf_jit_compile(fp); 1318 1319 /* JIT compiler couldn't process this filter, so do the 1320 * internal BPF translation for the optimized interpreter. 1321 */ 1322 if (!fp->jited) 1323 fp = bpf_migrate_filter(fp); 1324 1325 return fp; 1326 } 1327 1328 /** 1329 * bpf_prog_create - create an unattached filter 1330 * @pfp: the unattached filter that is created 1331 * @fprog: the filter program 1332 * 1333 * Create a filter independent of any socket. We first run some 1334 * sanity checks on it to make sure it does not explode on us later. 1335 * If an error occurs or there is insufficient memory for the filter 1336 * a negative errno code is returned. On success the return is zero. 1337 */ 1338 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog) 1339 { 1340 unsigned int fsize = bpf_classic_proglen(fprog); 1341 struct bpf_prog *fp; 1342 1343 /* Make sure new filter is there and in the right amounts. */ 1344 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1345 return -EINVAL; 1346 1347 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1348 if (!fp) 1349 return -ENOMEM; 1350 1351 memcpy(fp->insns, fprog->filter, fsize); 1352 1353 fp->len = fprog->len; 1354 /* Since unattached filters are not copied back to user 1355 * space through sk_get_filter(), we do not need to hold 1356 * a copy here, and can spare us the work. 1357 */ 1358 fp->orig_prog = NULL; 1359 1360 /* bpf_prepare_filter() already takes care of freeing 1361 * memory in case something goes wrong. 1362 */ 1363 fp = bpf_prepare_filter(fp, NULL); 1364 if (IS_ERR(fp)) 1365 return PTR_ERR(fp); 1366 1367 *pfp = fp; 1368 return 0; 1369 } 1370 EXPORT_SYMBOL_GPL(bpf_prog_create); 1371 1372 /** 1373 * bpf_prog_create_from_user - create an unattached filter from user buffer 1374 * @pfp: the unattached filter that is created 1375 * @fprog: the filter program 1376 * @trans: post-classic verifier transformation handler 1377 * @save_orig: save classic BPF program 1378 * 1379 * This function effectively does the same as bpf_prog_create(), only 1380 * that it builds up its insns buffer from user space provided buffer. 1381 * It also allows for passing a bpf_aux_classic_check_t handler. 1382 */ 1383 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, 1384 bpf_aux_classic_check_t trans, bool save_orig) 1385 { 1386 unsigned int fsize = bpf_classic_proglen(fprog); 1387 struct bpf_prog *fp; 1388 int err; 1389 1390 /* Make sure new filter is there and in the right amounts. */ 1391 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1392 return -EINVAL; 1393 1394 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1395 if (!fp) 1396 return -ENOMEM; 1397 1398 if (copy_from_user(fp->insns, fprog->filter, fsize)) { 1399 __bpf_prog_free(fp); 1400 return -EFAULT; 1401 } 1402 1403 fp->len = fprog->len; 1404 fp->orig_prog = NULL; 1405 1406 if (save_orig) { 1407 err = bpf_prog_store_orig_filter(fp, fprog); 1408 if (err) { 1409 __bpf_prog_free(fp); 1410 return -ENOMEM; 1411 } 1412 } 1413 1414 /* bpf_prepare_filter() already takes care of freeing 1415 * memory in case something goes wrong. 1416 */ 1417 fp = bpf_prepare_filter(fp, trans); 1418 if (IS_ERR(fp)) 1419 return PTR_ERR(fp); 1420 1421 *pfp = fp; 1422 return 0; 1423 } 1424 EXPORT_SYMBOL_GPL(bpf_prog_create_from_user); 1425 1426 void bpf_prog_destroy(struct bpf_prog *fp) 1427 { 1428 __bpf_prog_release(fp); 1429 } 1430 EXPORT_SYMBOL_GPL(bpf_prog_destroy); 1431 1432 static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk) 1433 { 1434 struct sk_filter *fp, *old_fp; 1435 1436 fp = kmalloc(sizeof(*fp), GFP_KERNEL); 1437 if (!fp) 1438 return -ENOMEM; 1439 1440 fp->prog = prog; 1441 1442 if (!__sk_filter_charge(sk, fp)) { 1443 kfree(fp); 1444 return -ENOMEM; 1445 } 1446 refcount_set(&fp->refcnt, 1); 1447 1448 old_fp = rcu_dereference_protected(sk->sk_filter, 1449 lockdep_sock_is_held(sk)); 1450 rcu_assign_pointer(sk->sk_filter, fp); 1451 1452 if (old_fp) 1453 sk_filter_uncharge(sk, old_fp); 1454 1455 return 0; 1456 } 1457 1458 static 1459 struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk) 1460 { 1461 unsigned int fsize = bpf_classic_proglen(fprog); 1462 struct bpf_prog *prog; 1463 int err; 1464 1465 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1466 return ERR_PTR(-EPERM); 1467 1468 /* Make sure new filter is there and in the right amounts. */ 1469 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1470 return ERR_PTR(-EINVAL); 1471 1472 prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1473 if (!prog) 1474 return ERR_PTR(-ENOMEM); 1475 1476 if (copy_from_user(prog->insns, fprog->filter, fsize)) { 1477 __bpf_prog_free(prog); 1478 return ERR_PTR(-EFAULT); 1479 } 1480 1481 prog->len = fprog->len; 1482 1483 err = bpf_prog_store_orig_filter(prog, fprog); 1484 if (err) { 1485 __bpf_prog_free(prog); 1486 return ERR_PTR(-ENOMEM); 1487 } 1488 1489 /* bpf_prepare_filter() already takes care of freeing 1490 * memory in case something goes wrong. 1491 */ 1492 return bpf_prepare_filter(prog, NULL); 1493 } 1494 1495 /** 1496 * sk_attach_filter - attach a socket filter 1497 * @fprog: the filter program 1498 * @sk: the socket to use 1499 * 1500 * Attach the user's filter code. We first run some sanity checks on 1501 * it to make sure it does not explode on us later. If an error 1502 * occurs or there is insufficient memory for the filter a negative 1503 * errno code is returned. On success the return is zero. 1504 */ 1505 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk) 1506 { 1507 struct bpf_prog *prog = __get_filter(fprog, sk); 1508 int err; 1509 1510 if (IS_ERR(prog)) 1511 return PTR_ERR(prog); 1512 1513 err = __sk_attach_prog(prog, sk); 1514 if (err < 0) { 1515 __bpf_prog_release(prog); 1516 return err; 1517 } 1518 1519 return 0; 1520 } 1521 EXPORT_SYMBOL_GPL(sk_attach_filter); 1522 1523 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk) 1524 { 1525 struct bpf_prog *prog = __get_filter(fprog, sk); 1526 int err; 1527 1528 if (IS_ERR(prog)) 1529 return PTR_ERR(prog); 1530 1531 if (bpf_prog_size(prog->len) > sysctl_optmem_max) 1532 err = -ENOMEM; 1533 else 1534 err = reuseport_attach_prog(sk, prog); 1535 1536 if (err) 1537 __bpf_prog_release(prog); 1538 1539 return err; 1540 } 1541 1542 static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk) 1543 { 1544 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1545 return ERR_PTR(-EPERM); 1546 1547 return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); 1548 } 1549 1550 int sk_attach_bpf(u32 ufd, struct sock *sk) 1551 { 1552 struct bpf_prog *prog = __get_bpf(ufd, sk); 1553 int err; 1554 1555 if (IS_ERR(prog)) 1556 return PTR_ERR(prog); 1557 1558 err = __sk_attach_prog(prog, sk); 1559 if (err < 0) { 1560 bpf_prog_put(prog); 1561 return err; 1562 } 1563 1564 return 0; 1565 } 1566 1567 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk) 1568 { 1569 struct bpf_prog *prog; 1570 int err; 1571 1572 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1573 return -EPERM; 1574 1575 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); 1576 if (PTR_ERR(prog) == -EINVAL) 1577 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SK_REUSEPORT); 1578 if (IS_ERR(prog)) 1579 return PTR_ERR(prog); 1580 1581 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) { 1582 /* Like other non BPF_PROG_TYPE_SOCKET_FILTER 1583 * bpf prog (e.g. sockmap). It depends on the 1584 * limitation imposed by bpf_prog_load(). 1585 * Hence, sysctl_optmem_max is not checked. 1586 */ 1587 if ((sk->sk_type != SOCK_STREAM && 1588 sk->sk_type != SOCK_DGRAM) || 1589 (sk->sk_protocol != IPPROTO_UDP && 1590 sk->sk_protocol != IPPROTO_TCP) || 1591 (sk->sk_family != AF_INET && 1592 sk->sk_family != AF_INET6)) { 1593 err = -ENOTSUPP; 1594 goto err_prog_put; 1595 } 1596 } else { 1597 /* BPF_PROG_TYPE_SOCKET_FILTER */ 1598 if (bpf_prog_size(prog->len) > sysctl_optmem_max) { 1599 err = -ENOMEM; 1600 goto err_prog_put; 1601 } 1602 } 1603 1604 err = reuseport_attach_prog(sk, prog); 1605 err_prog_put: 1606 if (err) 1607 bpf_prog_put(prog); 1608 1609 return err; 1610 } 1611 1612 void sk_reuseport_prog_free(struct bpf_prog *prog) 1613 { 1614 if (!prog) 1615 return; 1616 1617 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) 1618 bpf_prog_put(prog); 1619 else 1620 bpf_prog_destroy(prog); 1621 } 1622 1623 struct bpf_scratchpad { 1624 union { 1625 __be32 diff[MAX_BPF_STACK / sizeof(__be32)]; 1626 u8 buff[MAX_BPF_STACK]; 1627 }; 1628 }; 1629 1630 static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp); 1631 1632 static inline int __bpf_try_make_writable(struct sk_buff *skb, 1633 unsigned int write_len) 1634 { 1635 return skb_ensure_writable(skb, write_len); 1636 } 1637 1638 static inline int bpf_try_make_writable(struct sk_buff *skb, 1639 unsigned int write_len) 1640 { 1641 int err = __bpf_try_make_writable(skb, write_len); 1642 1643 bpf_compute_data_pointers(skb); 1644 return err; 1645 } 1646 1647 static int bpf_try_make_head_writable(struct sk_buff *skb) 1648 { 1649 return bpf_try_make_writable(skb, skb_headlen(skb)); 1650 } 1651 1652 static inline void bpf_push_mac_rcsum(struct sk_buff *skb) 1653 { 1654 if (skb_at_tc_ingress(skb)) 1655 skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len); 1656 } 1657 1658 static inline void bpf_pull_mac_rcsum(struct sk_buff *skb) 1659 { 1660 if (skb_at_tc_ingress(skb)) 1661 skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len); 1662 } 1663 1664 BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset, 1665 const void *, from, u32, len, u64, flags) 1666 { 1667 void *ptr; 1668 1669 if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH))) 1670 return -EINVAL; 1671 if (unlikely(offset > 0xffff)) 1672 return -EFAULT; 1673 if (unlikely(bpf_try_make_writable(skb, offset + len))) 1674 return -EFAULT; 1675 1676 ptr = skb->data + offset; 1677 if (flags & BPF_F_RECOMPUTE_CSUM) 1678 __skb_postpull_rcsum(skb, ptr, len, offset); 1679 1680 memcpy(ptr, from, len); 1681 1682 if (flags & BPF_F_RECOMPUTE_CSUM) 1683 __skb_postpush_rcsum(skb, ptr, len, offset); 1684 if (flags & BPF_F_INVALIDATE_HASH) 1685 skb_clear_hash(skb); 1686 1687 return 0; 1688 } 1689 1690 static const struct bpf_func_proto bpf_skb_store_bytes_proto = { 1691 .func = bpf_skb_store_bytes, 1692 .gpl_only = false, 1693 .ret_type = RET_INTEGER, 1694 .arg1_type = ARG_PTR_TO_CTX, 1695 .arg2_type = ARG_ANYTHING, 1696 .arg3_type = ARG_PTR_TO_MEM, 1697 .arg4_type = ARG_CONST_SIZE, 1698 .arg5_type = ARG_ANYTHING, 1699 }; 1700 1701 BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset, 1702 void *, to, u32, len) 1703 { 1704 void *ptr; 1705 1706 if (unlikely(offset > 0xffff)) 1707 goto err_clear; 1708 1709 ptr = skb_header_pointer(skb, offset, len, to); 1710 if (unlikely(!ptr)) 1711 goto err_clear; 1712 if (ptr != to) 1713 memcpy(to, ptr, len); 1714 1715 return 0; 1716 err_clear: 1717 memset(to, 0, len); 1718 return -EFAULT; 1719 } 1720 1721 static const struct bpf_func_proto bpf_skb_load_bytes_proto = { 1722 .func = bpf_skb_load_bytes, 1723 .gpl_only = false, 1724 .ret_type = RET_INTEGER, 1725 .arg1_type = ARG_PTR_TO_CTX, 1726 .arg2_type = ARG_ANYTHING, 1727 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1728 .arg4_type = ARG_CONST_SIZE, 1729 }; 1730 1731 BPF_CALL_4(bpf_flow_dissector_load_bytes, 1732 const struct bpf_flow_dissector *, ctx, u32, offset, 1733 void *, to, u32, len) 1734 { 1735 void *ptr; 1736 1737 if (unlikely(offset > 0xffff)) 1738 goto err_clear; 1739 1740 if (unlikely(!ctx->skb)) 1741 goto err_clear; 1742 1743 ptr = skb_header_pointer(ctx->skb, offset, len, to); 1744 if (unlikely(!ptr)) 1745 goto err_clear; 1746 if (ptr != to) 1747 memcpy(to, ptr, len); 1748 1749 return 0; 1750 err_clear: 1751 memset(to, 0, len); 1752 return -EFAULT; 1753 } 1754 1755 static const struct bpf_func_proto bpf_flow_dissector_load_bytes_proto = { 1756 .func = bpf_flow_dissector_load_bytes, 1757 .gpl_only = false, 1758 .ret_type = RET_INTEGER, 1759 .arg1_type = ARG_PTR_TO_CTX, 1760 .arg2_type = ARG_ANYTHING, 1761 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1762 .arg4_type = ARG_CONST_SIZE, 1763 }; 1764 1765 BPF_CALL_5(bpf_skb_load_bytes_relative, const struct sk_buff *, skb, 1766 u32, offset, void *, to, u32, len, u32, start_header) 1767 { 1768 u8 *end = skb_tail_pointer(skb); 1769 u8 *net = skb_network_header(skb); 1770 u8 *mac = skb_mac_header(skb); 1771 u8 *ptr; 1772 1773 if (unlikely(offset > 0xffff || len > (end - mac))) 1774 goto err_clear; 1775 1776 switch (start_header) { 1777 case BPF_HDR_START_MAC: 1778 ptr = mac + offset; 1779 break; 1780 case BPF_HDR_START_NET: 1781 ptr = net + offset; 1782 break; 1783 default: 1784 goto err_clear; 1785 } 1786 1787 if (likely(ptr >= mac && ptr + len <= end)) { 1788 memcpy(to, ptr, len); 1789 return 0; 1790 } 1791 1792 err_clear: 1793 memset(to, 0, len); 1794 return -EFAULT; 1795 } 1796 1797 static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto = { 1798 .func = bpf_skb_load_bytes_relative, 1799 .gpl_only = false, 1800 .ret_type = RET_INTEGER, 1801 .arg1_type = ARG_PTR_TO_CTX, 1802 .arg2_type = ARG_ANYTHING, 1803 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1804 .arg4_type = ARG_CONST_SIZE, 1805 .arg5_type = ARG_ANYTHING, 1806 }; 1807 1808 BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len) 1809 { 1810 /* Idea is the following: should the needed direct read/write 1811 * test fail during runtime, we can pull in more data and redo 1812 * again, since implicitly, we invalidate previous checks here. 1813 * 1814 * Or, since we know how much we need to make read/writeable, 1815 * this can be done once at the program beginning for direct 1816 * access case. By this we overcome limitations of only current 1817 * headroom being accessible. 1818 */ 1819 return bpf_try_make_writable(skb, len ? : skb_headlen(skb)); 1820 } 1821 1822 static const struct bpf_func_proto bpf_skb_pull_data_proto = { 1823 .func = bpf_skb_pull_data, 1824 .gpl_only = false, 1825 .ret_type = RET_INTEGER, 1826 .arg1_type = ARG_PTR_TO_CTX, 1827 .arg2_type = ARG_ANYTHING, 1828 }; 1829 1830 BPF_CALL_1(bpf_sk_fullsock, struct sock *, sk) 1831 { 1832 return sk_fullsock(sk) ? (unsigned long)sk : (unsigned long)NULL; 1833 } 1834 1835 static const struct bpf_func_proto bpf_sk_fullsock_proto = { 1836 .func = bpf_sk_fullsock, 1837 .gpl_only = false, 1838 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 1839 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 1840 }; 1841 1842 static inline int sk_skb_try_make_writable(struct sk_buff *skb, 1843 unsigned int write_len) 1844 { 1845 int err = __bpf_try_make_writable(skb, write_len); 1846 1847 bpf_compute_data_end_sk_skb(skb); 1848 return err; 1849 } 1850 1851 BPF_CALL_2(sk_skb_pull_data, struct sk_buff *, skb, u32, len) 1852 { 1853 /* Idea is the following: should the needed direct read/write 1854 * test fail during runtime, we can pull in more data and redo 1855 * again, since implicitly, we invalidate previous checks here. 1856 * 1857 * Or, since we know how much we need to make read/writeable, 1858 * this can be done once at the program beginning for direct 1859 * access case. By this we overcome limitations of only current 1860 * headroom being accessible. 1861 */ 1862 return sk_skb_try_make_writable(skb, len ? : skb_headlen(skb)); 1863 } 1864 1865 static const struct bpf_func_proto sk_skb_pull_data_proto = { 1866 .func = sk_skb_pull_data, 1867 .gpl_only = false, 1868 .ret_type = RET_INTEGER, 1869 .arg1_type = ARG_PTR_TO_CTX, 1870 .arg2_type = ARG_ANYTHING, 1871 }; 1872 1873 BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset, 1874 u64, from, u64, to, u64, flags) 1875 { 1876 __sum16 *ptr; 1877 1878 if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK))) 1879 return -EINVAL; 1880 if (unlikely(offset > 0xffff || offset & 1)) 1881 return -EFAULT; 1882 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) 1883 return -EFAULT; 1884 1885 ptr = (__sum16 *)(skb->data + offset); 1886 switch (flags & BPF_F_HDR_FIELD_MASK) { 1887 case 0: 1888 if (unlikely(from != 0)) 1889 return -EINVAL; 1890 1891 csum_replace_by_diff(ptr, to); 1892 break; 1893 case 2: 1894 csum_replace2(ptr, from, to); 1895 break; 1896 case 4: 1897 csum_replace4(ptr, from, to); 1898 break; 1899 default: 1900 return -EINVAL; 1901 } 1902 1903 return 0; 1904 } 1905 1906 static const struct bpf_func_proto bpf_l3_csum_replace_proto = { 1907 .func = bpf_l3_csum_replace, 1908 .gpl_only = false, 1909 .ret_type = RET_INTEGER, 1910 .arg1_type = ARG_PTR_TO_CTX, 1911 .arg2_type = ARG_ANYTHING, 1912 .arg3_type = ARG_ANYTHING, 1913 .arg4_type = ARG_ANYTHING, 1914 .arg5_type = ARG_ANYTHING, 1915 }; 1916 1917 BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset, 1918 u64, from, u64, to, u64, flags) 1919 { 1920 bool is_pseudo = flags & BPF_F_PSEUDO_HDR; 1921 bool is_mmzero = flags & BPF_F_MARK_MANGLED_0; 1922 bool do_mforce = flags & BPF_F_MARK_ENFORCE; 1923 __sum16 *ptr; 1924 1925 if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE | 1926 BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK))) 1927 return -EINVAL; 1928 if (unlikely(offset > 0xffff || offset & 1)) 1929 return -EFAULT; 1930 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) 1931 return -EFAULT; 1932 1933 ptr = (__sum16 *)(skb->data + offset); 1934 if (is_mmzero && !do_mforce && !*ptr) 1935 return 0; 1936 1937 switch (flags & BPF_F_HDR_FIELD_MASK) { 1938 case 0: 1939 if (unlikely(from != 0)) 1940 return -EINVAL; 1941 1942 inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo); 1943 break; 1944 case 2: 1945 inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo); 1946 break; 1947 case 4: 1948 inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo); 1949 break; 1950 default: 1951 return -EINVAL; 1952 } 1953 1954 if (is_mmzero && !*ptr) 1955 *ptr = CSUM_MANGLED_0; 1956 return 0; 1957 } 1958 1959 static const struct bpf_func_proto bpf_l4_csum_replace_proto = { 1960 .func = bpf_l4_csum_replace, 1961 .gpl_only = false, 1962 .ret_type = RET_INTEGER, 1963 .arg1_type = ARG_PTR_TO_CTX, 1964 .arg2_type = ARG_ANYTHING, 1965 .arg3_type = ARG_ANYTHING, 1966 .arg4_type = ARG_ANYTHING, 1967 .arg5_type = ARG_ANYTHING, 1968 }; 1969 1970 BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size, 1971 __be32 *, to, u32, to_size, __wsum, seed) 1972 { 1973 struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp); 1974 u32 diff_size = from_size + to_size; 1975 int i, j = 0; 1976 1977 /* This is quite flexible, some examples: 1978 * 1979 * from_size == 0, to_size > 0, seed := csum --> pushing data 1980 * from_size > 0, to_size == 0, seed := csum --> pulling data 1981 * from_size > 0, to_size > 0, seed := 0 --> diffing data 1982 * 1983 * Even for diffing, from_size and to_size don't need to be equal. 1984 */ 1985 if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) || 1986 diff_size > sizeof(sp->diff))) 1987 return -EINVAL; 1988 1989 for (i = 0; i < from_size / sizeof(__be32); i++, j++) 1990 sp->diff[j] = ~from[i]; 1991 for (i = 0; i < to_size / sizeof(__be32); i++, j++) 1992 sp->diff[j] = to[i]; 1993 1994 return csum_partial(sp->diff, diff_size, seed); 1995 } 1996 1997 static const struct bpf_func_proto bpf_csum_diff_proto = { 1998 .func = bpf_csum_diff, 1999 .gpl_only = false, 2000 .pkt_access = true, 2001 .ret_type = RET_INTEGER, 2002 .arg1_type = ARG_PTR_TO_MEM_OR_NULL, 2003 .arg2_type = ARG_CONST_SIZE_OR_ZERO, 2004 .arg3_type = ARG_PTR_TO_MEM_OR_NULL, 2005 .arg4_type = ARG_CONST_SIZE_OR_ZERO, 2006 .arg5_type = ARG_ANYTHING, 2007 }; 2008 2009 BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum) 2010 { 2011 /* The interface is to be used in combination with bpf_csum_diff() 2012 * for direct packet writes. csum rotation for alignment as well 2013 * as emulating csum_sub() can be done from the eBPF program. 2014 */ 2015 if (skb->ip_summed == CHECKSUM_COMPLETE) 2016 return (skb->csum = csum_add(skb->csum, csum)); 2017 2018 return -ENOTSUPP; 2019 } 2020 2021 static const struct bpf_func_proto bpf_csum_update_proto = { 2022 .func = bpf_csum_update, 2023 .gpl_only = false, 2024 .ret_type = RET_INTEGER, 2025 .arg1_type = ARG_PTR_TO_CTX, 2026 .arg2_type = ARG_ANYTHING, 2027 }; 2028 2029 static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb) 2030 { 2031 return dev_forward_skb(dev, skb); 2032 } 2033 2034 static inline int __bpf_rx_skb_no_mac(struct net_device *dev, 2035 struct sk_buff *skb) 2036 { 2037 int ret = ____dev_forward_skb(dev, skb); 2038 2039 if (likely(!ret)) { 2040 skb->dev = dev; 2041 ret = netif_rx(skb); 2042 } 2043 2044 return ret; 2045 } 2046 2047 static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb) 2048 { 2049 int ret; 2050 2051 if (dev_xmit_recursion()) { 2052 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); 2053 kfree_skb(skb); 2054 return -ENETDOWN; 2055 } 2056 2057 skb->dev = dev; 2058 skb->tstamp = 0; 2059 2060 dev_xmit_recursion_inc(); 2061 ret = dev_queue_xmit(skb); 2062 dev_xmit_recursion_dec(); 2063 2064 return ret; 2065 } 2066 2067 static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev, 2068 u32 flags) 2069 { 2070 unsigned int mlen = skb_network_offset(skb); 2071 2072 if (mlen) { 2073 __skb_pull(skb, mlen); 2074 2075 /* At ingress, the mac header has already been pulled once. 2076 * At egress, skb_pospull_rcsum has to be done in case that 2077 * the skb is originated from ingress (i.e. a forwarded skb) 2078 * to ensure that rcsum starts at net header. 2079 */ 2080 if (!skb_at_tc_ingress(skb)) 2081 skb_postpull_rcsum(skb, skb_mac_header(skb), mlen); 2082 } 2083 skb_pop_mac_header(skb); 2084 skb_reset_mac_len(skb); 2085 return flags & BPF_F_INGRESS ? 2086 __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb); 2087 } 2088 2089 static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev, 2090 u32 flags) 2091 { 2092 /* Verify that a link layer header is carried */ 2093 if (unlikely(skb->mac_header >= skb->network_header)) { 2094 kfree_skb(skb); 2095 return -ERANGE; 2096 } 2097 2098 bpf_push_mac_rcsum(skb); 2099 return flags & BPF_F_INGRESS ? 2100 __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb); 2101 } 2102 2103 static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev, 2104 u32 flags) 2105 { 2106 if (dev_is_mac_header_xmit(dev)) 2107 return __bpf_redirect_common(skb, dev, flags); 2108 else 2109 return __bpf_redirect_no_mac(skb, dev, flags); 2110 } 2111 2112 BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags) 2113 { 2114 struct net_device *dev; 2115 struct sk_buff *clone; 2116 int ret; 2117 2118 if (unlikely(flags & ~(BPF_F_INGRESS))) 2119 return -EINVAL; 2120 2121 dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex); 2122 if (unlikely(!dev)) 2123 return -EINVAL; 2124 2125 clone = skb_clone(skb, GFP_ATOMIC); 2126 if (unlikely(!clone)) 2127 return -ENOMEM; 2128 2129 /* For direct write, we need to keep the invariant that the skbs 2130 * we're dealing with need to be uncloned. Should uncloning fail 2131 * here, we need to free the just generated clone to unclone once 2132 * again. 2133 */ 2134 ret = bpf_try_make_head_writable(skb); 2135 if (unlikely(ret)) { 2136 kfree_skb(clone); 2137 return -ENOMEM; 2138 } 2139 2140 return __bpf_redirect(clone, dev, flags); 2141 } 2142 2143 static const struct bpf_func_proto bpf_clone_redirect_proto = { 2144 .func = bpf_clone_redirect, 2145 .gpl_only = false, 2146 .ret_type = RET_INTEGER, 2147 .arg1_type = ARG_PTR_TO_CTX, 2148 .arg2_type = ARG_ANYTHING, 2149 .arg3_type = ARG_ANYTHING, 2150 }; 2151 2152 DEFINE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info); 2153 EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info); 2154 2155 BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags) 2156 { 2157 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2158 2159 if (unlikely(flags & ~(BPF_F_INGRESS))) 2160 return TC_ACT_SHOT; 2161 2162 ri->flags = flags; 2163 ri->tgt_index = ifindex; 2164 2165 return TC_ACT_REDIRECT; 2166 } 2167 2168 int skb_do_redirect(struct sk_buff *skb) 2169 { 2170 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2171 struct net_device *dev; 2172 2173 dev = dev_get_by_index_rcu(dev_net(skb->dev), ri->tgt_index); 2174 ri->tgt_index = 0; 2175 if (unlikely(!dev)) { 2176 kfree_skb(skb); 2177 return -EINVAL; 2178 } 2179 2180 return __bpf_redirect(skb, dev, ri->flags); 2181 } 2182 2183 static const struct bpf_func_proto bpf_redirect_proto = { 2184 .func = bpf_redirect, 2185 .gpl_only = false, 2186 .ret_type = RET_INTEGER, 2187 .arg1_type = ARG_ANYTHING, 2188 .arg2_type = ARG_ANYTHING, 2189 }; 2190 2191 BPF_CALL_2(bpf_msg_apply_bytes, struct sk_msg *, msg, u32, bytes) 2192 { 2193 msg->apply_bytes = bytes; 2194 return 0; 2195 } 2196 2197 static const struct bpf_func_proto bpf_msg_apply_bytes_proto = { 2198 .func = bpf_msg_apply_bytes, 2199 .gpl_only = false, 2200 .ret_type = RET_INTEGER, 2201 .arg1_type = ARG_PTR_TO_CTX, 2202 .arg2_type = ARG_ANYTHING, 2203 }; 2204 2205 BPF_CALL_2(bpf_msg_cork_bytes, struct sk_msg *, msg, u32, bytes) 2206 { 2207 msg->cork_bytes = bytes; 2208 return 0; 2209 } 2210 2211 static const struct bpf_func_proto bpf_msg_cork_bytes_proto = { 2212 .func = bpf_msg_cork_bytes, 2213 .gpl_only = false, 2214 .ret_type = RET_INTEGER, 2215 .arg1_type = ARG_PTR_TO_CTX, 2216 .arg2_type = ARG_ANYTHING, 2217 }; 2218 2219 BPF_CALL_4(bpf_msg_pull_data, struct sk_msg *, msg, u32, start, 2220 u32, end, u64, flags) 2221 { 2222 u32 len = 0, offset = 0, copy = 0, poffset = 0, bytes = end - start; 2223 u32 first_sge, last_sge, i, shift, bytes_sg_total; 2224 struct scatterlist *sge; 2225 u8 *raw, *to, *from; 2226 struct page *page; 2227 2228 if (unlikely(flags || end <= start)) 2229 return -EINVAL; 2230 2231 /* First find the starting scatterlist element */ 2232 i = msg->sg.start; 2233 do { 2234 offset += len; 2235 len = sk_msg_elem(msg, i)->length; 2236 if (start < offset + len) 2237 break; 2238 sk_msg_iter_var_next(i); 2239 } while (i != msg->sg.end); 2240 2241 if (unlikely(start >= offset + len)) 2242 return -EINVAL; 2243 2244 first_sge = i; 2245 /* The start may point into the sg element so we need to also 2246 * account for the headroom. 2247 */ 2248 bytes_sg_total = start - offset + bytes; 2249 if (!test_bit(i, &msg->sg.copy) && bytes_sg_total <= len) 2250 goto out; 2251 2252 /* At this point we need to linearize multiple scatterlist 2253 * elements or a single shared page. Either way we need to 2254 * copy into a linear buffer exclusively owned by BPF. Then 2255 * place the buffer in the scatterlist and fixup the original 2256 * entries by removing the entries now in the linear buffer 2257 * and shifting the remaining entries. For now we do not try 2258 * to copy partial entries to avoid complexity of running out 2259 * of sg_entry slots. The downside is reading a single byte 2260 * will copy the entire sg entry. 2261 */ 2262 do { 2263 copy += sk_msg_elem(msg, i)->length; 2264 sk_msg_iter_var_next(i); 2265 if (bytes_sg_total <= copy) 2266 break; 2267 } while (i != msg->sg.end); 2268 last_sge = i; 2269 2270 if (unlikely(bytes_sg_total > copy)) 2271 return -EINVAL; 2272 2273 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, 2274 get_order(copy)); 2275 if (unlikely(!page)) 2276 return -ENOMEM; 2277 2278 raw = page_address(page); 2279 i = first_sge; 2280 do { 2281 sge = sk_msg_elem(msg, i); 2282 from = sg_virt(sge); 2283 len = sge->length; 2284 to = raw + poffset; 2285 2286 memcpy(to, from, len); 2287 poffset += len; 2288 sge->length = 0; 2289 put_page(sg_page(sge)); 2290 2291 sk_msg_iter_var_next(i); 2292 } while (i != last_sge); 2293 2294 sg_set_page(&msg->sg.data[first_sge], page, copy, 0); 2295 2296 /* To repair sg ring we need to shift entries. If we only 2297 * had a single entry though we can just replace it and 2298 * be done. Otherwise walk the ring and shift the entries. 2299 */ 2300 WARN_ON_ONCE(last_sge == first_sge); 2301 shift = last_sge > first_sge ? 2302 last_sge - first_sge - 1 : 2303 NR_MSG_FRAG_IDS - first_sge + last_sge - 1; 2304 if (!shift) 2305 goto out; 2306 2307 i = first_sge; 2308 sk_msg_iter_var_next(i); 2309 do { 2310 u32 move_from; 2311 2312 if (i + shift >= NR_MSG_FRAG_IDS) 2313 move_from = i + shift - NR_MSG_FRAG_IDS; 2314 else 2315 move_from = i + shift; 2316 if (move_from == msg->sg.end) 2317 break; 2318 2319 msg->sg.data[i] = msg->sg.data[move_from]; 2320 msg->sg.data[move_from].length = 0; 2321 msg->sg.data[move_from].page_link = 0; 2322 msg->sg.data[move_from].offset = 0; 2323 sk_msg_iter_var_next(i); 2324 } while (1); 2325 2326 msg->sg.end = msg->sg.end - shift > msg->sg.end ? 2327 msg->sg.end - shift + NR_MSG_FRAG_IDS : 2328 msg->sg.end - shift; 2329 out: 2330 msg->data = sg_virt(&msg->sg.data[first_sge]) + start - offset; 2331 msg->data_end = msg->data + bytes; 2332 return 0; 2333 } 2334 2335 static const struct bpf_func_proto bpf_msg_pull_data_proto = { 2336 .func = bpf_msg_pull_data, 2337 .gpl_only = false, 2338 .ret_type = RET_INTEGER, 2339 .arg1_type = ARG_PTR_TO_CTX, 2340 .arg2_type = ARG_ANYTHING, 2341 .arg3_type = ARG_ANYTHING, 2342 .arg4_type = ARG_ANYTHING, 2343 }; 2344 2345 BPF_CALL_4(bpf_msg_push_data, struct sk_msg *, msg, u32, start, 2346 u32, len, u64, flags) 2347 { 2348 struct scatterlist sge, nsge, nnsge, rsge = {0}, *psge; 2349 u32 new, i = 0, l = 0, space, copy = 0, offset = 0; 2350 u8 *raw, *to, *from; 2351 struct page *page; 2352 2353 if (unlikely(flags)) 2354 return -EINVAL; 2355 2356 /* First find the starting scatterlist element */ 2357 i = msg->sg.start; 2358 do { 2359 offset += l; 2360 l = sk_msg_elem(msg, i)->length; 2361 2362 if (start < offset + l) 2363 break; 2364 sk_msg_iter_var_next(i); 2365 } while (i != msg->sg.end); 2366 2367 if (start >= offset + l) 2368 return -EINVAL; 2369 2370 space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); 2371 2372 /* If no space available will fallback to copy, we need at 2373 * least one scatterlist elem available to push data into 2374 * when start aligns to the beginning of an element or two 2375 * when it falls inside an element. We handle the start equals 2376 * offset case because its the common case for inserting a 2377 * header. 2378 */ 2379 if (!space || (space == 1 && start != offset)) 2380 copy = msg->sg.data[i].length; 2381 2382 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, 2383 get_order(copy + len)); 2384 if (unlikely(!page)) 2385 return -ENOMEM; 2386 2387 if (copy) { 2388 int front, back; 2389 2390 raw = page_address(page); 2391 2392 psge = sk_msg_elem(msg, i); 2393 front = start - offset; 2394 back = psge->length - front; 2395 from = sg_virt(psge); 2396 2397 if (front) 2398 memcpy(raw, from, front); 2399 2400 if (back) { 2401 from += front; 2402 to = raw + front + len; 2403 2404 memcpy(to, from, back); 2405 } 2406 2407 put_page(sg_page(psge)); 2408 } else if (start - offset) { 2409 psge = sk_msg_elem(msg, i); 2410 rsge = sk_msg_elem_cpy(msg, i); 2411 2412 psge->length = start - offset; 2413 rsge.length -= psge->length; 2414 rsge.offset += start; 2415 2416 sk_msg_iter_var_next(i); 2417 sg_unmark_end(psge); 2418 sg_unmark_end(&rsge); 2419 sk_msg_iter_next(msg, end); 2420 } 2421 2422 /* Slot(s) to place newly allocated data */ 2423 new = i; 2424 2425 /* Shift one or two slots as needed */ 2426 if (!copy) { 2427 sge = sk_msg_elem_cpy(msg, i); 2428 2429 sk_msg_iter_var_next(i); 2430 sg_unmark_end(&sge); 2431 sk_msg_iter_next(msg, end); 2432 2433 nsge = sk_msg_elem_cpy(msg, i); 2434 if (rsge.length) { 2435 sk_msg_iter_var_next(i); 2436 nnsge = sk_msg_elem_cpy(msg, i); 2437 } 2438 2439 while (i != msg->sg.end) { 2440 msg->sg.data[i] = sge; 2441 sge = nsge; 2442 sk_msg_iter_var_next(i); 2443 if (rsge.length) { 2444 nsge = nnsge; 2445 nnsge = sk_msg_elem_cpy(msg, i); 2446 } else { 2447 nsge = sk_msg_elem_cpy(msg, i); 2448 } 2449 } 2450 } 2451 2452 /* Place newly allocated data buffer */ 2453 sk_mem_charge(msg->sk, len); 2454 msg->sg.size += len; 2455 __clear_bit(new, &msg->sg.copy); 2456 sg_set_page(&msg->sg.data[new], page, len + copy, 0); 2457 if (rsge.length) { 2458 get_page(sg_page(&rsge)); 2459 sk_msg_iter_var_next(new); 2460 msg->sg.data[new] = rsge; 2461 } 2462 2463 sk_msg_compute_data_pointers(msg); 2464 return 0; 2465 } 2466 2467 static const struct bpf_func_proto bpf_msg_push_data_proto = { 2468 .func = bpf_msg_push_data, 2469 .gpl_only = false, 2470 .ret_type = RET_INTEGER, 2471 .arg1_type = ARG_PTR_TO_CTX, 2472 .arg2_type = ARG_ANYTHING, 2473 .arg3_type = ARG_ANYTHING, 2474 .arg4_type = ARG_ANYTHING, 2475 }; 2476 2477 static void sk_msg_shift_left(struct sk_msg *msg, int i) 2478 { 2479 int prev; 2480 2481 do { 2482 prev = i; 2483 sk_msg_iter_var_next(i); 2484 msg->sg.data[prev] = msg->sg.data[i]; 2485 } while (i != msg->sg.end); 2486 2487 sk_msg_iter_prev(msg, end); 2488 } 2489 2490 static void sk_msg_shift_right(struct sk_msg *msg, int i) 2491 { 2492 struct scatterlist tmp, sge; 2493 2494 sk_msg_iter_next(msg, end); 2495 sge = sk_msg_elem_cpy(msg, i); 2496 sk_msg_iter_var_next(i); 2497 tmp = sk_msg_elem_cpy(msg, i); 2498 2499 while (i != msg->sg.end) { 2500 msg->sg.data[i] = sge; 2501 sk_msg_iter_var_next(i); 2502 sge = tmp; 2503 tmp = sk_msg_elem_cpy(msg, i); 2504 } 2505 } 2506 2507 BPF_CALL_4(bpf_msg_pop_data, struct sk_msg *, msg, u32, start, 2508 u32, len, u64, flags) 2509 { 2510 u32 i = 0, l = 0, space, offset = 0; 2511 u64 last = start + len; 2512 int pop; 2513 2514 if (unlikely(flags)) 2515 return -EINVAL; 2516 2517 /* First find the starting scatterlist element */ 2518 i = msg->sg.start; 2519 do { 2520 offset += l; 2521 l = sk_msg_elem(msg, i)->length; 2522 2523 if (start < offset + l) 2524 break; 2525 sk_msg_iter_var_next(i); 2526 } while (i != msg->sg.end); 2527 2528 /* Bounds checks: start and pop must be inside message */ 2529 if (start >= offset + l || last >= msg->sg.size) 2530 return -EINVAL; 2531 2532 space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); 2533 2534 pop = len; 2535 /* --------------| offset 2536 * -| start |-------- len -------| 2537 * 2538 * |----- a ----|-------- pop -------|----- b ----| 2539 * |______________________________________________| length 2540 * 2541 * 2542 * a: region at front of scatter element to save 2543 * b: region at back of scatter element to save when length > A + pop 2544 * pop: region to pop from element, same as input 'pop' here will be 2545 * decremented below per iteration. 2546 * 2547 * Two top-level cases to handle when start != offset, first B is non 2548 * zero and second B is zero corresponding to when a pop includes more 2549 * than one element. 2550 * 2551 * Then if B is non-zero AND there is no space allocate space and 2552 * compact A, B regions into page. If there is space shift ring to 2553 * the rigth free'ing the next element in ring to place B, leaving 2554 * A untouched except to reduce length. 2555 */ 2556 if (start != offset) { 2557 struct scatterlist *nsge, *sge = sk_msg_elem(msg, i); 2558 int a = start; 2559 int b = sge->length - pop - a; 2560 2561 sk_msg_iter_var_next(i); 2562 2563 if (pop < sge->length - a) { 2564 if (space) { 2565 sge->length = a; 2566 sk_msg_shift_right(msg, i); 2567 nsge = sk_msg_elem(msg, i); 2568 get_page(sg_page(sge)); 2569 sg_set_page(nsge, 2570 sg_page(sge), 2571 b, sge->offset + pop + a); 2572 } else { 2573 struct page *page, *orig; 2574 u8 *to, *from; 2575 2576 page = alloc_pages(__GFP_NOWARN | 2577 __GFP_COMP | GFP_ATOMIC, 2578 get_order(a + b)); 2579 if (unlikely(!page)) 2580 return -ENOMEM; 2581 2582 sge->length = a; 2583 orig = sg_page(sge); 2584 from = sg_virt(sge); 2585 to = page_address(page); 2586 memcpy(to, from, a); 2587 memcpy(to + a, from + a + pop, b); 2588 sg_set_page(sge, page, a + b, 0); 2589 put_page(orig); 2590 } 2591 pop = 0; 2592 } else if (pop >= sge->length - a) { 2593 sge->length = a; 2594 pop -= (sge->length - a); 2595 } 2596 } 2597 2598 /* From above the current layout _must_ be as follows, 2599 * 2600 * -| offset 2601 * -| start 2602 * 2603 * |---- pop ---|---------------- b ------------| 2604 * |____________________________________________| length 2605 * 2606 * Offset and start of the current msg elem are equal because in the 2607 * previous case we handled offset != start and either consumed the 2608 * entire element and advanced to the next element OR pop == 0. 2609 * 2610 * Two cases to handle here are first pop is less than the length 2611 * leaving some remainder b above. Simply adjust the element's layout 2612 * in this case. Or pop >= length of the element so that b = 0. In this 2613 * case advance to next element decrementing pop. 2614 */ 2615 while (pop) { 2616 struct scatterlist *sge = sk_msg_elem(msg, i); 2617 2618 if (pop < sge->length) { 2619 sge->length -= pop; 2620 sge->offset += pop; 2621 pop = 0; 2622 } else { 2623 pop -= sge->length; 2624 sk_msg_shift_left(msg, i); 2625 } 2626 sk_msg_iter_var_next(i); 2627 } 2628 2629 sk_mem_uncharge(msg->sk, len - pop); 2630 msg->sg.size -= (len - pop); 2631 sk_msg_compute_data_pointers(msg); 2632 return 0; 2633 } 2634 2635 static const struct bpf_func_proto bpf_msg_pop_data_proto = { 2636 .func = bpf_msg_pop_data, 2637 .gpl_only = false, 2638 .ret_type = RET_INTEGER, 2639 .arg1_type = ARG_PTR_TO_CTX, 2640 .arg2_type = ARG_ANYTHING, 2641 .arg3_type = ARG_ANYTHING, 2642 .arg4_type = ARG_ANYTHING, 2643 }; 2644 2645 BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb) 2646 { 2647 return task_get_classid(skb); 2648 } 2649 2650 static const struct bpf_func_proto bpf_get_cgroup_classid_proto = { 2651 .func = bpf_get_cgroup_classid, 2652 .gpl_only = false, 2653 .ret_type = RET_INTEGER, 2654 .arg1_type = ARG_PTR_TO_CTX, 2655 }; 2656 2657 BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb) 2658 { 2659 return dst_tclassid(skb); 2660 } 2661 2662 static const struct bpf_func_proto bpf_get_route_realm_proto = { 2663 .func = bpf_get_route_realm, 2664 .gpl_only = false, 2665 .ret_type = RET_INTEGER, 2666 .arg1_type = ARG_PTR_TO_CTX, 2667 }; 2668 2669 BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb) 2670 { 2671 /* If skb_clear_hash() was called due to mangling, we can 2672 * trigger SW recalculation here. Later access to hash 2673 * can then use the inline skb->hash via context directly 2674 * instead of calling this helper again. 2675 */ 2676 return skb_get_hash(skb); 2677 } 2678 2679 static const struct bpf_func_proto bpf_get_hash_recalc_proto = { 2680 .func = bpf_get_hash_recalc, 2681 .gpl_only = false, 2682 .ret_type = RET_INTEGER, 2683 .arg1_type = ARG_PTR_TO_CTX, 2684 }; 2685 2686 BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb) 2687 { 2688 /* After all direct packet write, this can be used once for 2689 * triggering a lazy recalc on next skb_get_hash() invocation. 2690 */ 2691 skb_clear_hash(skb); 2692 return 0; 2693 } 2694 2695 static const struct bpf_func_proto bpf_set_hash_invalid_proto = { 2696 .func = bpf_set_hash_invalid, 2697 .gpl_only = false, 2698 .ret_type = RET_INTEGER, 2699 .arg1_type = ARG_PTR_TO_CTX, 2700 }; 2701 2702 BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash) 2703 { 2704 /* Set user specified hash as L4(+), so that it gets returned 2705 * on skb_get_hash() call unless BPF prog later on triggers a 2706 * skb_clear_hash(). 2707 */ 2708 __skb_set_sw_hash(skb, hash, true); 2709 return 0; 2710 } 2711 2712 static const struct bpf_func_proto bpf_set_hash_proto = { 2713 .func = bpf_set_hash, 2714 .gpl_only = false, 2715 .ret_type = RET_INTEGER, 2716 .arg1_type = ARG_PTR_TO_CTX, 2717 .arg2_type = ARG_ANYTHING, 2718 }; 2719 2720 BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto, 2721 u16, vlan_tci) 2722 { 2723 int ret; 2724 2725 if (unlikely(vlan_proto != htons(ETH_P_8021Q) && 2726 vlan_proto != htons(ETH_P_8021AD))) 2727 vlan_proto = htons(ETH_P_8021Q); 2728 2729 bpf_push_mac_rcsum(skb); 2730 ret = skb_vlan_push(skb, vlan_proto, vlan_tci); 2731 bpf_pull_mac_rcsum(skb); 2732 2733 bpf_compute_data_pointers(skb); 2734 return ret; 2735 } 2736 2737 static const struct bpf_func_proto bpf_skb_vlan_push_proto = { 2738 .func = bpf_skb_vlan_push, 2739 .gpl_only = false, 2740 .ret_type = RET_INTEGER, 2741 .arg1_type = ARG_PTR_TO_CTX, 2742 .arg2_type = ARG_ANYTHING, 2743 .arg3_type = ARG_ANYTHING, 2744 }; 2745 2746 BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb) 2747 { 2748 int ret; 2749 2750 bpf_push_mac_rcsum(skb); 2751 ret = skb_vlan_pop(skb); 2752 bpf_pull_mac_rcsum(skb); 2753 2754 bpf_compute_data_pointers(skb); 2755 return ret; 2756 } 2757 2758 static const struct bpf_func_proto bpf_skb_vlan_pop_proto = { 2759 .func = bpf_skb_vlan_pop, 2760 .gpl_only = false, 2761 .ret_type = RET_INTEGER, 2762 .arg1_type = ARG_PTR_TO_CTX, 2763 }; 2764 2765 static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len) 2766 { 2767 /* Caller already did skb_cow() with len as headroom, 2768 * so no need to do it here. 2769 */ 2770 skb_push(skb, len); 2771 memmove(skb->data, skb->data + len, off); 2772 memset(skb->data + off, 0, len); 2773 2774 /* No skb_postpush_rcsum(skb, skb->data + off, len) 2775 * needed here as it does not change the skb->csum 2776 * result for checksum complete when summing over 2777 * zeroed blocks. 2778 */ 2779 return 0; 2780 } 2781 2782 static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len) 2783 { 2784 /* skb_ensure_writable() is not needed here, as we're 2785 * already working on an uncloned skb. 2786 */ 2787 if (unlikely(!pskb_may_pull(skb, off + len))) 2788 return -ENOMEM; 2789 2790 skb_postpull_rcsum(skb, skb->data + off, len); 2791 memmove(skb->data + len, skb->data, off); 2792 __skb_pull(skb, len); 2793 2794 return 0; 2795 } 2796 2797 static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len) 2798 { 2799 bool trans_same = skb->transport_header == skb->network_header; 2800 int ret; 2801 2802 /* There's no need for __skb_push()/__skb_pull() pair to 2803 * get to the start of the mac header as we're guaranteed 2804 * to always start from here under eBPF. 2805 */ 2806 ret = bpf_skb_generic_push(skb, off, len); 2807 if (likely(!ret)) { 2808 skb->mac_header -= len; 2809 skb->network_header -= len; 2810 if (trans_same) 2811 skb->transport_header = skb->network_header; 2812 } 2813 2814 return ret; 2815 } 2816 2817 static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len) 2818 { 2819 bool trans_same = skb->transport_header == skb->network_header; 2820 int ret; 2821 2822 /* Same here, __skb_push()/__skb_pull() pair not needed. */ 2823 ret = bpf_skb_generic_pop(skb, off, len); 2824 if (likely(!ret)) { 2825 skb->mac_header += len; 2826 skb->network_header += len; 2827 if (trans_same) 2828 skb->transport_header = skb->network_header; 2829 } 2830 2831 return ret; 2832 } 2833 2834 static int bpf_skb_proto_4_to_6(struct sk_buff *skb) 2835 { 2836 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); 2837 u32 off = skb_mac_header_len(skb); 2838 int ret; 2839 2840 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) 2841 return -ENOTSUPP; 2842 2843 ret = skb_cow(skb, len_diff); 2844 if (unlikely(ret < 0)) 2845 return ret; 2846 2847 ret = bpf_skb_net_hdr_push(skb, off, len_diff); 2848 if (unlikely(ret < 0)) 2849 return ret; 2850 2851 if (skb_is_gso(skb)) { 2852 struct skb_shared_info *shinfo = skb_shinfo(skb); 2853 2854 /* SKB_GSO_TCPV4 needs to be changed into 2855 * SKB_GSO_TCPV6. 2856 */ 2857 if (shinfo->gso_type & SKB_GSO_TCPV4) { 2858 shinfo->gso_type &= ~SKB_GSO_TCPV4; 2859 shinfo->gso_type |= SKB_GSO_TCPV6; 2860 } 2861 2862 /* Due to IPv6 header, MSS needs to be downgraded. */ 2863 skb_decrease_gso_size(shinfo, len_diff); 2864 /* Header must be checked, and gso_segs recomputed. */ 2865 shinfo->gso_type |= SKB_GSO_DODGY; 2866 shinfo->gso_segs = 0; 2867 } 2868 2869 skb->protocol = htons(ETH_P_IPV6); 2870 skb_clear_hash(skb); 2871 2872 return 0; 2873 } 2874 2875 static int bpf_skb_proto_6_to_4(struct sk_buff *skb) 2876 { 2877 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); 2878 u32 off = skb_mac_header_len(skb); 2879 int ret; 2880 2881 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) 2882 return -ENOTSUPP; 2883 2884 ret = skb_unclone(skb, GFP_ATOMIC); 2885 if (unlikely(ret < 0)) 2886 return ret; 2887 2888 ret = bpf_skb_net_hdr_pop(skb, off, len_diff); 2889 if (unlikely(ret < 0)) 2890 return ret; 2891 2892 if (skb_is_gso(skb)) { 2893 struct skb_shared_info *shinfo = skb_shinfo(skb); 2894 2895 /* SKB_GSO_TCPV6 needs to be changed into 2896 * SKB_GSO_TCPV4. 2897 */ 2898 if (shinfo->gso_type & SKB_GSO_TCPV6) { 2899 shinfo->gso_type &= ~SKB_GSO_TCPV6; 2900 shinfo->gso_type |= SKB_GSO_TCPV4; 2901 } 2902 2903 /* Due to IPv4 header, MSS can be upgraded. */ 2904 skb_increase_gso_size(shinfo, len_diff); 2905 /* Header must be checked, and gso_segs recomputed. */ 2906 shinfo->gso_type |= SKB_GSO_DODGY; 2907 shinfo->gso_segs = 0; 2908 } 2909 2910 skb->protocol = htons(ETH_P_IP); 2911 skb_clear_hash(skb); 2912 2913 return 0; 2914 } 2915 2916 static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto) 2917 { 2918 __be16 from_proto = skb->protocol; 2919 2920 if (from_proto == htons(ETH_P_IP) && 2921 to_proto == htons(ETH_P_IPV6)) 2922 return bpf_skb_proto_4_to_6(skb); 2923 2924 if (from_proto == htons(ETH_P_IPV6) && 2925 to_proto == htons(ETH_P_IP)) 2926 return bpf_skb_proto_6_to_4(skb); 2927 2928 return -ENOTSUPP; 2929 } 2930 2931 BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto, 2932 u64, flags) 2933 { 2934 int ret; 2935 2936 if (unlikely(flags)) 2937 return -EINVAL; 2938 2939 /* General idea is that this helper does the basic groundwork 2940 * needed for changing the protocol, and eBPF program fills the 2941 * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace() 2942 * and other helpers, rather than passing a raw buffer here. 2943 * 2944 * The rationale is to keep this minimal and without a need to 2945 * deal with raw packet data. F.e. even if we would pass buffers 2946 * here, the program still needs to call the bpf_lX_csum_replace() 2947 * helpers anyway. Plus, this way we keep also separation of 2948 * concerns, since f.e. bpf_skb_store_bytes() should only take 2949 * care of stores. 2950 * 2951 * Currently, additional options and extension header space are 2952 * not supported, but flags register is reserved so we can adapt 2953 * that. For offloads, we mark packet as dodgy, so that headers 2954 * need to be verified first. 2955 */ 2956 ret = bpf_skb_proto_xlat(skb, proto); 2957 bpf_compute_data_pointers(skb); 2958 return ret; 2959 } 2960 2961 static const struct bpf_func_proto bpf_skb_change_proto_proto = { 2962 .func = bpf_skb_change_proto, 2963 .gpl_only = false, 2964 .ret_type = RET_INTEGER, 2965 .arg1_type = ARG_PTR_TO_CTX, 2966 .arg2_type = ARG_ANYTHING, 2967 .arg3_type = ARG_ANYTHING, 2968 }; 2969 2970 BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type) 2971 { 2972 /* We only allow a restricted subset to be changed for now. */ 2973 if (unlikely(!skb_pkt_type_ok(skb->pkt_type) || 2974 !skb_pkt_type_ok(pkt_type))) 2975 return -EINVAL; 2976 2977 skb->pkt_type = pkt_type; 2978 return 0; 2979 } 2980 2981 static const struct bpf_func_proto bpf_skb_change_type_proto = { 2982 .func = bpf_skb_change_type, 2983 .gpl_only = false, 2984 .ret_type = RET_INTEGER, 2985 .arg1_type = ARG_PTR_TO_CTX, 2986 .arg2_type = ARG_ANYTHING, 2987 }; 2988 2989 static u32 bpf_skb_net_base_len(const struct sk_buff *skb) 2990 { 2991 switch (skb->protocol) { 2992 case htons(ETH_P_IP): 2993 return sizeof(struct iphdr); 2994 case htons(ETH_P_IPV6): 2995 return sizeof(struct ipv6hdr); 2996 default: 2997 return ~0U; 2998 } 2999 } 3000 3001 #define BPF_F_ADJ_ROOM_ENCAP_L3_MASK (BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 | \ 3002 BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3003 3004 #define BPF_F_ADJ_ROOM_MASK (BPF_F_ADJ_ROOM_FIXED_GSO | \ 3005 BPF_F_ADJ_ROOM_ENCAP_L3_MASK | \ 3006 BPF_F_ADJ_ROOM_ENCAP_L4_GRE | \ 3007 BPF_F_ADJ_ROOM_ENCAP_L4_UDP | \ 3008 BPF_F_ADJ_ROOM_ENCAP_L2( \ 3009 BPF_ADJ_ROOM_ENCAP_L2_MASK)) 3010 3011 static int bpf_skb_net_grow(struct sk_buff *skb, u32 off, u32 len_diff, 3012 u64 flags) 3013 { 3014 u8 inner_mac_len = flags >> BPF_ADJ_ROOM_ENCAP_L2_SHIFT; 3015 bool encap = flags & BPF_F_ADJ_ROOM_ENCAP_L3_MASK; 3016 u16 mac_len = 0, inner_net = 0, inner_trans = 0; 3017 unsigned int gso_type = SKB_GSO_DODGY; 3018 int ret; 3019 3020 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { 3021 /* udp gso_size delineates datagrams, only allow if fixed */ 3022 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || 3023 !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3024 return -ENOTSUPP; 3025 } 3026 3027 ret = skb_cow_head(skb, len_diff); 3028 if (unlikely(ret < 0)) 3029 return ret; 3030 3031 if (encap) { 3032 if (skb->protocol != htons(ETH_P_IP) && 3033 skb->protocol != htons(ETH_P_IPV6)) 3034 return -ENOTSUPP; 3035 3036 if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 && 3037 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3038 return -EINVAL; 3039 3040 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE && 3041 flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) 3042 return -EINVAL; 3043 3044 if (skb->encapsulation) 3045 return -EALREADY; 3046 3047 mac_len = skb->network_header - skb->mac_header; 3048 inner_net = skb->network_header; 3049 if (inner_mac_len > len_diff) 3050 return -EINVAL; 3051 inner_trans = skb->transport_header; 3052 } 3053 3054 ret = bpf_skb_net_hdr_push(skb, off, len_diff); 3055 if (unlikely(ret < 0)) 3056 return ret; 3057 3058 if (encap) { 3059 skb->inner_mac_header = inner_net - inner_mac_len; 3060 skb->inner_network_header = inner_net; 3061 skb->inner_transport_header = inner_trans; 3062 skb_set_inner_protocol(skb, skb->protocol); 3063 3064 skb->encapsulation = 1; 3065 skb_set_network_header(skb, mac_len); 3066 3067 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) 3068 gso_type |= SKB_GSO_UDP_TUNNEL; 3069 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE) 3070 gso_type |= SKB_GSO_GRE; 3071 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3072 gso_type |= SKB_GSO_IPXIP6; 3073 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) 3074 gso_type |= SKB_GSO_IPXIP4; 3075 3076 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE || 3077 flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) { 3078 int nh_len = flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6 ? 3079 sizeof(struct ipv6hdr) : 3080 sizeof(struct iphdr); 3081 3082 skb_set_transport_header(skb, mac_len + nh_len); 3083 } 3084 3085 /* Match skb->protocol to new outer l3 protocol */ 3086 if (skb->protocol == htons(ETH_P_IP) && 3087 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3088 skb->protocol = htons(ETH_P_IPV6); 3089 else if (skb->protocol == htons(ETH_P_IPV6) && 3090 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) 3091 skb->protocol = htons(ETH_P_IP); 3092 } 3093 3094 if (skb_is_gso(skb)) { 3095 struct skb_shared_info *shinfo = skb_shinfo(skb); 3096 3097 /* Due to header grow, MSS needs to be downgraded. */ 3098 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3099 skb_decrease_gso_size(shinfo, len_diff); 3100 3101 /* Header must be checked, and gso_segs recomputed. */ 3102 shinfo->gso_type |= gso_type; 3103 shinfo->gso_segs = 0; 3104 } 3105 3106 return 0; 3107 } 3108 3109 static int bpf_skb_net_shrink(struct sk_buff *skb, u32 off, u32 len_diff, 3110 u64 flags) 3111 { 3112 int ret; 3113 3114 if (flags & ~BPF_F_ADJ_ROOM_FIXED_GSO) 3115 return -EINVAL; 3116 3117 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { 3118 /* udp gso_size delineates datagrams, only allow if fixed */ 3119 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || 3120 !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3121 return -ENOTSUPP; 3122 } 3123 3124 ret = skb_unclone(skb, GFP_ATOMIC); 3125 if (unlikely(ret < 0)) 3126 return ret; 3127 3128 ret = bpf_skb_net_hdr_pop(skb, off, len_diff); 3129 if (unlikely(ret < 0)) 3130 return ret; 3131 3132 if (skb_is_gso(skb)) { 3133 struct skb_shared_info *shinfo = skb_shinfo(skb); 3134 3135 /* Due to header shrink, MSS can be upgraded. */ 3136 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3137 skb_increase_gso_size(shinfo, len_diff); 3138 3139 /* Header must be checked, and gso_segs recomputed. */ 3140 shinfo->gso_type |= SKB_GSO_DODGY; 3141 shinfo->gso_segs = 0; 3142 } 3143 3144 return 0; 3145 } 3146 3147 static u32 __bpf_skb_max_len(const struct sk_buff *skb) 3148 { 3149 return skb->dev ? skb->dev->mtu + skb->dev->hard_header_len : 3150 SKB_MAX_ALLOC; 3151 } 3152 3153 BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, 3154 u32, mode, u64, flags) 3155 { 3156 u32 len_cur, len_diff_abs = abs(len_diff); 3157 u32 len_min = bpf_skb_net_base_len(skb); 3158 u32 len_max = __bpf_skb_max_len(skb); 3159 __be16 proto = skb->protocol; 3160 bool shrink = len_diff < 0; 3161 u32 off; 3162 int ret; 3163 3164 if (unlikely(flags & ~BPF_F_ADJ_ROOM_MASK)) 3165 return -EINVAL; 3166 if (unlikely(len_diff_abs > 0xfffU)) 3167 return -EFAULT; 3168 if (unlikely(proto != htons(ETH_P_IP) && 3169 proto != htons(ETH_P_IPV6))) 3170 return -ENOTSUPP; 3171 3172 off = skb_mac_header_len(skb); 3173 switch (mode) { 3174 case BPF_ADJ_ROOM_NET: 3175 off += bpf_skb_net_base_len(skb); 3176 break; 3177 case BPF_ADJ_ROOM_MAC: 3178 break; 3179 default: 3180 return -ENOTSUPP; 3181 } 3182 3183 len_cur = skb->len - skb_network_offset(skb); 3184 if ((shrink && (len_diff_abs >= len_cur || 3185 len_cur - len_diff_abs < len_min)) || 3186 (!shrink && (skb->len + len_diff_abs > len_max && 3187 !skb_is_gso(skb)))) 3188 return -ENOTSUPP; 3189 3190 ret = shrink ? bpf_skb_net_shrink(skb, off, len_diff_abs, flags) : 3191 bpf_skb_net_grow(skb, off, len_diff_abs, flags); 3192 3193 bpf_compute_data_pointers(skb); 3194 return ret; 3195 } 3196 3197 static const struct bpf_func_proto bpf_skb_adjust_room_proto = { 3198 .func = bpf_skb_adjust_room, 3199 .gpl_only = false, 3200 .ret_type = RET_INTEGER, 3201 .arg1_type = ARG_PTR_TO_CTX, 3202 .arg2_type = ARG_ANYTHING, 3203 .arg3_type = ARG_ANYTHING, 3204 .arg4_type = ARG_ANYTHING, 3205 }; 3206 3207 static u32 __bpf_skb_min_len(const struct sk_buff *skb) 3208 { 3209 u32 min_len = skb_network_offset(skb); 3210 3211 if (skb_transport_header_was_set(skb)) 3212 min_len = skb_transport_offset(skb); 3213 if (skb->ip_summed == CHECKSUM_PARTIAL) 3214 min_len = skb_checksum_start_offset(skb) + 3215 skb->csum_offset + sizeof(__sum16); 3216 return min_len; 3217 } 3218 3219 static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len) 3220 { 3221 unsigned int old_len = skb->len; 3222 int ret; 3223 3224 ret = __skb_grow_rcsum(skb, new_len); 3225 if (!ret) 3226 memset(skb->data + old_len, 0, new_len - old_len); 3227 return ret; 3228 } 3229 3230 static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len) 3231 { 3232 return __skb_trim_rcsum(skb, new_len); 3233 } 3234 3235 static inline int __bpf_skb_change_tail(struct sk_buff *skb, u32 new_len, 3236 u64 flags) 3237 { 3238 u32 max_len = __bpf_skb_max_len(skb); 3239 u32 min_len = __bpf_skb_min_len(skb); 3240 int ret; 3241 3242 if (unlikely(flags || new_len > max_len || new_len < min_len)) 3243 return -EINVAL; 3244 if (skb->encapsulation) 3245 return -ENOTSUPP; 3246 3247 /* The basic idea of this helper is that it's performing the 3248 * needed work to either grow or trim an skb, and eBPF program 3249 * rewrites the rest via helpers like bpf_skb_store_bytes(), 3250 * bpf_lX_csum_replace() and others rather than passing a raw 3251 * buffer here. This one is a slow path helper and intended 3252 * for replies with control messages. 3253 * 3254 * Like in bpf_skb_change_proto(), we want to keep this rather 3255 * minimal and without protocol specifics so that we are able 3256 * to separate concerns as in bpf_skb_store_bytes() should only 3257 * be the one responsible for writing buffers. 3258 * 3259 * It's really expected to be a slow path operation here for 3260 * control message replies, so we're implicitly linearizing, 3261 * uncloning and drop offloads from the skb by this. 3262 */ 3263 ret = __bpf_try_make_writable(skb, skb->len); 3264 if (!ret) { 3265 if (new_len > skb->len) 3266 ret = bpf_skb_grow_rcsum(skb, new_len); 3267 else if (new_len < skb->len) 3268 ret = bpf_skb_trim_rcsum(skb, new_len); 3269 if (!ret && skb_is_gso(skb)) 3270 skb_gso_reset(skb); 3271 } 3272 return ret; 3273 } 3274 3275 BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len, 3276 u64, flags) 3277 { 3278 int ret = __bpf_skb_change_tail(skb, new_len, flags); 3279 3280 bpf_compute_data_pointers(skb); 3281 return ret; 3282 } 3283 3284 static const struct bpf_func_proto bpf_skb_change_tail_proto = { 3285 .func = bpf_skb_change_tail, 3286 .gpl_only = false, 3287 .ret_type = RET_INTEGER, 3288 .arg1_type = ARG_PTR_TO_CTX, 3289 .arg2_type = ARG_ANYTHING, 3290 .arg3_type = ARG_ANYTHING, 3291 }; 3292 3293 BPF_CALL_3(sk_skb_change_tail, struct sk_buff *, skb, u32, new_len, 3294 u64, flags) 3295 { 3296 int ret = __bpf_skb_change_tail(skb, new_len, flags); 3297 3298 bpf_compute_data_end_sk_skb(skb); 3299 return ret; 3300 } 3301 3302 static const struct bpf_func_proto sk_skb_change_tail_proto = { 3303 .func = sk_skb_change_tail, 3304 .gpl_only = false, 3305 .ret_type = RET_INTEGER, 3306 .arg1_type = ARG_PTR_TO_CTX, 3307 .arg2_type = ARG_ANYTHING, 3308 .arg3_type = ARG_ANYTHING, 3309 }; 3310 3311 static inline int __bpf_skb_change_head(struct sk_buff *skb, u32 head_room, 3312 u64 flags) 3313 { 3314 u32 max_len = __bpf_skb_max_len(skb); 3315 u32 new_len = skb->len + head_room; 3316 int ret; 3317 3318 if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) || 3319 new_len < skb->len)) 3320 return -EINVAL; 3321 3322 ret = skb_cow(skb, head_room); 3323 if (likely(!ret)) { 3324 /* Idea for this helper is that we currently only 3325 * allow to expand on mac header. This means that 3326 * skb->protocol network header, etc, stay as is. 3327 * Compared to bpf_skb_change_tail(), we're more 3328 * flexible due to not needing to linearize or 3329 * reset GSO. Intention for this helper is to be 3330 * used by an L3 skb that needs to push mac header 3331 * for redirection into L2 device. 3332 */ 3333 __skb_push(skb, head_room); 3334 memset(skb->data, 0, head_room); 3335 skb_reset_mac_header(skb); 3336 } 3337 3338 return ret; 3339 } 3340 3341 BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room, 3342 u64, flags) 3343 { 3344 int ret = __bpf_skb_change_head(skb, head_room, flags); 3345 3346 bpf_compute_data_pointers(skb); 3347 return ret; 3348 } 3349 3350 static const struct bpf_func_proto bpf_skb_change_head_proto = { 3351 .func = bpf_skb_change_head, 3352 .gpl_only = false, 3353 .ret_type = RET_INTEGER, 3354 .arg1_type = ARG_PTR_TO_CTX, 3355 .arg2_type = ARG_ANYTHING, 3356 .arg3_type = ARG_ANYTHING, 3357 }; 3358 3359 BPF_CALL_3(sk_skb_change_head, struct sk_buff *, skb, u32, head_room, 3360 u64, flags) 3361 { 3362 int ret = __bpf_skb_change_head(skb, head_room, flags); 3363 3364 bpf_compute_data_end_sk_skb(skb); 3365 return ret; 3366 } 3367 3368 static const struct bpf_func_proto sk_skb_change_head_proto = { 3369 .func = sk_skb_change_head, 3370 .gpl_only = false, 3371 .ret_type = RET_INTEGER, 3372 .arg1_type = ARG_PTR_TO_CTX, 3373 .arg2_type = ARG_ANYTHING, 3374 .arg3_type = ARG_ANYTHING, 3375 }; 3376 static unsigned long xdp_get_metalen(const struct xdp_buff *xdp) 3377 { 3378 return xdp_data_meta_unsupported(xdp) ? 0 : 3379 xdp->data - xdp->data_meta; 3380 } 3381 3382 BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset) 3383 { 3384 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); 3385 unsigned long metalen = xdp_get_metalen(xdp); 3386 void *data_start = xdp_frame_end + metalen; 3387 void *data = xdp->data + offset; 3388 3389 if (unlikely(data < data_start || 3390 data > xdp->data_end - ETH_HLEN)) 3391 return -EINVAL; 3392 3393 if (metalen) 3394 memmove(xdp->data_meta + offset, 3395 xdp->data_meta, metalen); 3396 xdp->data_meta += offset; 3397 xdp->data = data; 3398 3399 return 0; 3400 } 3401 3402 static const struct bpf_func_proto bpf_xdp_adjust_head_proto = { 3403 .func = bpf_xdp_adjust_head, 3404 .gpl_only = false, 3405 .ret_type = RET_INTEGER, 3406 .arg1_type = ARG_PTR_TO_CTX, 3407 .arg2_type = ARG_ANYTHING, 3408 }; 3409 3410 BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset) 3411 { 3412 void *data_end = xdp->data_end + offset; 3413 3414 /* only shrinking is allowed for now. */ 3415 if (unlikely(offset >= 0)) 3416 return -EINVAL; 3417 3418 if (unlikely(data_end < xdp->data + ETH_HLEN)) 3419 return -EINVAL; 3420 3421 xdp->data_end = data_end; 3422 3423 return 0; 3424 } 3425 3426 static const struct bpf_func_proto bpf_xdp_adjust_tail_proto = { 3427 .func = bpf_xdp_adjust_tail, 3428 .gpl_only = false, 3429 .ret_type = RET_INTEGER, 3430 .arg1_type = ARG_PTR_TO_CTX, 3431 .arg2_type = ARG_ANYTHING, 3432 }; 3433 3434 BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset) 3435 { 3436 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); 3437 void *meta = xdp->data_meta + offset; 3438 unsigned long metalen = xdp->data - meta; 3439 3440 if (xdp_data_meta_unsupported(xdp)) 3441 return -ENOTSUPP; 3442 if (unlikely(meta < xdp_frame_end || 3443 meta > xdp->data)) 3444 return -EINVAL; 3445 if (unlikely((metalen & (sizeof(__u32) - 1)) || 3446 (metalen > 32))) 3447 return -EACCES; 3448 3449 xdp->data_meta = meta; 3450 3451 return 0; 3452 } 3453 3454 static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = { 3455 .func = bpf_xdp_adjust_meta, 3456 .gpl_only = false, 3457 .ret_type = RET_INTEGER, 3458 .arg1_type = ARG_PTR_TO_CTX, 3459 .arg2_type = ARG_ANYTHING, 3460 }; 3461 3462 static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd, 3463 struct bpf_map *map, struct xdp_buff *xdp) 3464 { 3465 switch (map->map_type) { 3466 case BPF_MAP_TYPE_DEVMAP: 3467 case BPF_MAP_TYPE_DEVMAP_HASH: 3468 return dev_map_enqueue(fwd, xdp, dev_rx); 3469 case BPF_MAP_TYPE_CPUMAP: 3470 return cpu_map_enqueue(fwd, xdp, dev_rx); 3471 case BPF_MAP_TYPE_XSKMAP: 3472 return __xsk_map_redirect(fwd, xdp); 3473 default: 3474 return -EBADRQC; 3475 } 3476 return 0; 3477 } 3478 3479 void xdp_do_flush(void) 3480 { 3481 __dev_flush(); 3482 __cpu_map_flush(); 3483 __xsk_map_flush(); 3484 } 3485 EXPORT_SYMBOL_GPL(xdp_do_flush); 3486 3487 static inline void *__xdp_map_lookup_elem(struct bpf_map *map, u32 index) 3488 { 3489 switch (map->map_type) { 3490 case BPF_MAP_TYPE_DEVMAP: 3491 return __dev_map_lookup_elem(map, index); 3492 case BPF_MAP_TYPE_DEVMAP_HASH: 3493 return __dev_map_hash_lookup_elem(map, index); 3494 case BPF_MAP_TYPE_CPUMAP: 3495 return __cpu_map_lookup_elem(map, index); 3496 case BPF_MAP_TYPE_XSKMAP: 3497 return __xsk_map_lookup_elem(map, index); 3498 default: 3499 return NULL; 3500 } 3501 } 3502 3503 void bpf_clear_redirect_map(struct bpf_map *map) 3504 { 3505 struct bpf_redirect_info *ri; 3506 int cpu; 3507 3508 for_each_possible_cpu(cpu) { 3509 ri = per_cpu_ptr(&bpf_redirect_info, cpu); 3510 /* Avoid polluting remote cacheline due to writes if 3511 * not needed. Once we pass this test, we need the 3512 * cmpxchg() to make sure it hasn't been changed in 3513 * the meantime by remote CPU. 3514 */ 3515 if (unlikely(READ_ONCE(ri->map) == map)) 3516 cmpxchg(&ri->map, map, NULL); 3517 } 3518 } 3519 3520 int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp, 3521 struct bpf_prog *xdp_prog) 3522 { 3523 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 3524 struct bpf_map *map = READ_ONCE(ri->map); 3525 u32 index = ri->tgt_index; 3526 void *fwd = ri->tgt_value; 3527 int err; 3528 3529 ri->tgt_index = 0; 3530 ri->tgt_value = NULL; 3531 WRITE_ONCE(ri->map, NULL); 3532 3533 if (unlikely(!map)) { 3534 fwd = dev_get_by_index_rcu(dev_net(dev), index); 3535 if (unlikely(!fwd)) { 3536 err = -EINVAL; 3537 goto err; 3538 } 3539 3540 err = dev_xdp_enqueue(fwd, xdp, dev); 3541 } else { 3542 err = __bpf_tx_xdp_map(dev, fwd, map, xdp); 3543 } 3544 3545 if (unlikely(err)) 3546 goto err; 3547 3548 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index); 3549 return 0; 3550 err: 3551 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err); 3552 return err; 3553 } 3554 EXPORT_SYMBOL_GPL(xdp_do_redirect); 3555 3556 static int xdp_do_generic_redirect_map(struct net_device *dev, 3557 struct sk_buff *skb, 3558 struct xdp_buff *xdp, 3559 struct bpf_prog *xdp_prog, 3560 struct bpf_map *map) 3561 { 3562 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 3563 u32 index = ri->tgt_index; 3564 void *fwd = ri->tgt_value; 3565 int err = 0; 3566 3567 ri->tgt_index = 0; 3568 ri->tgt_value = NULL; 3569 WRITE_ONCE(ri->map, NULL); 3570 3571 if (map->map_type == BPF_MAP_TYPE_DEVMAP || 3572 map->map_type == BPF_MAP_TYPE_DEVMAP_HASH) { 3573 struct bpf_dtab_netdev *dst = fwd; 3574 3575 err = dev_map_generic_redirect(dst, skb, xdp_prog); 3576 if (unlikely(err)) 3577 goto err; 3578 } else if (map->map_type == BPF_MAP_TYPE_XSKMAP) { 3579 struct xdp_sock *xs = fwd; 3580 3581 err = xsk_generic_rcv(xs, xdp); 3582 if (err) 3583 goto err; 3584 consume_skb(skb); 3585 } else { 3586 /* TODO: Handle BPF_MAP_TYPE_CPUMAP */ 3587 err = -EBADRQC; 3588 goto err; 3589 } 3590 3591 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index); 3592 return 0; 3593 err: 3594 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err); 3595 return err; 3596 } 3597 3598 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb, 3599 struct xdp_buff *xdp, struct bpf_prog *xdp_prog) 3600 { 3601 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 3602 struct bpf_map *map = READ_ONCE(ri->map); 3603 u32 index = ri->tgt_index; 3604 struct net_device *fwd; 3605 int err = 0; 3606 3607 if (map) 3608 return xdp_do_generic_redirect_map(dev, skb, xdp, xdp_prog, 3609 map); 3610 ri->tgt_index = 0; 3611 fwd = dev_get_by_index_rcu(dev_net(dev), index); 3612 if (unlikely(!fwd)) { 3613 err = -EINVAL; 3614 goto err; 3615 } 3616 3617 err = xdp_ok_fwd_dev(fwd, skb->len); 3618 if (unlikely(err)) 3619 goto err; 3620 3621 skb->dev = fwd; 3622 _trace_xdp_redirect(dev, xdp_prog, index); 3623 generic_xdp_tx(skb, xdp_prog); 3624 return 0; 3625 err: 3626 _trace_xdp_redirect_err(dev, xdp_prog, index, err); 3627 return err; 3628 } 3629 EXPORT_SYMBOL_GPL(xdp_do_generic_redirect); 3630 3631 BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags) 3632 { 3633 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 3634 3635 if (unlikely(flags)) 3636 return XDP_ABORTED; 3637 3638 ri->flags = flags; 3639 ri->tgt_index = ifindex; 3640 ri->tgt_value = NULL; 3641 WRITE_ONCE(ri->map, NULL); 3642 3643 return XDP_REDIRECT; 3644 } 3645 3646 static const struct bpf_func_proto bpf_xdp_redirect_proto = { 3647 .func = bpf_xdp_redirect, 3648 .gpl_only = false, 3649 .ret_type = RET_INTEGER, 3650 .arg1_type = ARG_ANYTHING, 3651 .arg2_type = ARG_ANYTHING, 3652 }; 3653 3654 BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex, 3655 u64, flags) 3656 { 3657 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 3658 3659 /* Lower bits of the flags are used as return code on lookup failure */ 3660 if (unlikely(flags > XDP_TX)) 3661 return XDP_ABORTED; 3662 3663 ri->tgt_value = __xdp_map_lookup_elem(map, ifindex); 3664 if (unlikely(!ri->tgt_value)) { 3665 /* If the lookup fails we want to clear out the state in the 3666 * redirect_info struct completely, so that if an eBPF program 3667 * performs multiple lookups, the last one always takes 3668 * precedence. 3669 */ 3670 WRITE_ONCE(ri->map, NULL); 3671 return flags; 3672 } 3673 3674 ri->flags = flags; 3675 ri->tgt_index = ifindex; 3676 WRITE_ONCE(ri->map, map); 3677 3678 return XDP_REDIRECT; 3679 } 3680 3681 static const struct bpf_func_proto bpf_xdp_redirect_map_proto = { 3682 .func = bpf_xdp_redirect_map, 3683 .gpl_only = false, 3684 .ret_type = RET_INTEGER, 3685 .arg1_type = ARG_CONST_MAP_PTR, 3686 .arg2_type = ARG_ANYTHING, 3687 .arg3_type = ARG_ANYTHING, 3688 }; 3689 3690 static unsigned long bpf_skb_copy(void *dst_buff, const void *skb, 3691 unsigned long off, unsigned long len) 3692 { 3693 void *ptr = skb_header_pointer(skb, off, len, dst_buff); 3694 3695 if (unlikely(!ptr)) 3696 return len; 3697 if (ptr != dst_buff) 3698 memcpy(dst_buff, ptr, len); 3699 3700 return 0; 3701 } 3702 3703 BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map, 3704 u64, flags, void *, meta, u64, meta_size) 3705 { 3706 u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32; 3707 3708 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) 3709 return -EINVAL; 3710 if (unlikely(!skb || skb_size > skb->len)) 3711 return -EFAULT; 3712 3713 return bpf_event_output(map, flags, meta, meta_size, skb, skb_size, 3714 bpf_skb_copy); 3715 } 3716 3717 static const struct bpf_func_proto bpf_skb_event_output_proto = { 3718 .func = bpf_skb_event_output, 3719 .gpl_only = true, 3720 .ret_type = RET_INTEGER, 3721 .arg1_type = ARG_PTR_TO_CTX, 3722 .arg2_type = ARG_CONST_MAP_PTR, 3723 .arg3_type = ARG_ANYTHING, 3724 .arg4_type = ARG_PTR_TO_MEM, 3725 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 3726 }; 3727 3728 static int bpf_skb_output_btf_ids[5]; 3729 const struct bpf_func_proto bpf_skb_output_proto = { 3730 .func = bpf_skb_event_output, 3731 .gpl_only = true, 3732 .ret_type = RET_INTEGER, 3733 .arg1_type = ARG_PTR_TO_BTF_ID, 3734 .arg2_type = ARG_CONST_MAP_PTR, 3735 .arg3_type = ARG_ANYTHING, 3736 .arg4_type = ARG_PTR_TO_MEM, 3737 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 3738 .btf_id = bpf_skb_output_btf_ids, 3739 }; 3740 3741 static unsigned short bpf_tunnel_key_af(u64 flags) 3742 { 3743 return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET; 3744 } 3745 3746 BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to, 3747 u32, size, u64, flags) 3748 { 3749 const struct ip_tunnel_info *info = skb_tunnel_info(skb); 3750 u8 compat[sizeof(struct bpf_tunnel_key)]; 3751 void *to_orig = to; 3752 int err; 3753 3754 if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) { 3755 err = -EINVAL; 3756 goto err_clear; 3757 } 3758 if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) { 3759 err = -EPROTO; 3760 goto err_clear; 3761 } 3762 if (unlikely(size != sizeof(struct bpf_tunnel_key))) { 3763 err = -EINVAL; 3764 switch (size) { 3765 case offsetof(struct bpf_tunnel_key, tunnel_label): 3766 case offsetof(struct bpf_tunnel_key, tunnel_ext): 3767 goto set_compat; 3768 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): 3769 /* Fixup deprecated structure layouts here, so we have 3770 * a common path later on. 3771 */ 3772 if (ip_tunnel_info_af(info) != AF_INET) 3773 goto err_clear; 3774 set_compat: 3775 to = (struct bpf_tunnel_key *)compat; 3776 break; 3777 default: 3778 goto err_clear; 3779 } 3780 } 3781 3782 to->tunnel_id = be64_to_cpu(info->key.tun_id); 3783 to->tunnel_tos = info->key.tos; 3784 to->tunnel_ttl = info->key.ttl; 3785 to->tunnel_ext = 0; 3786 3787 if (flags & BPF_F_TUNINFO_IPV6) { 3788 memcpy(to->remote_ipv6, &info->key.u.ipv6.src, 3789 sizeof(to->remote_ipv6)); 3790 to->tunnel_label = be32_to_cpu(info->key.label); 3791 } else { 3792 to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src); 3793 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); 3794 to->tunnel_label = 0; 3795 } 3796 3797 if (unlikely(size != sizeof(struct bpf_tunnel_key))) 3798 memcpy(to_orig, to, size); 3799 3800 return 0; 3801 err_clear: 3802 memset(to_orig, 0, size); 3803 return err; 3804 } 3805 3806 static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = { 3807 .func = bpf_skb_get_tunnel_key, 3808 .gpl_only = false, 3809 .ret_type = RET_INTEGER, 3810 .arg1_type = ARG_PTR_TO_CTX, 3811 .arg2_type = ARG_PTR_TO_UNINIT_MEM, 3812 .arg3_type = ARG_CONST_SIZE, 3813 .arg4_type = ARG_ANYTHING, 3814 }; 3815 3816 BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size) 3817 { 3818 const struct ip_tunnel_info *info = skb_tunnel_info(skb); 3819 int err; 3820 3821 if (unlikely(!info || 3822 !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) { 3823 err = -ENOENT; 3824 goto err_clear; 3825 } 3826 if (unlikely(size < info->options_len)) { 3827 err = -ENOMEM; 3828 goto err_clear; 3829 } 3830 3831 ip_tunnel_info_opts_get(to, info); 3832 if (size > info->options_len) 3833 memset(to + info->options_len, 0, size - info->options_len); 3834 3835 return info->options_len; 3836 err_clear: 3837 memset(to, 0, size); 3838 return err; 3839 } 3840 3841 static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = { 3842 .func = bpf_skb_get_tunnel_opt, 3843 .gpl_only = false, 3844 .ret_type = RET_INTEGER, 3845 .arg1_type = ARG_PTR_TO_CTX, 3846 .arg2_type = ARG_PTR_TO_UNINIT_MEM, 3847 .arg3_type = ARG_CONST_SIZE, 3848 }; 3849 3850 static struct metadata_dst __percpu *md_dst; 3851 3852 BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb, 3853 const struct bpf_tunnel_key *, from, u32, size, u64, flags) 3854 { 3855 struct metadata_dst *md = this_cpu_ptr(md_dst); 3856 u8 compat[sizeof(struct bpf_tunnel_key)]; 3857 struct ip_tunnel_info *info; 3858 3859 if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX | 3860 BPF_F_DONT_FRAGMENT | BPF_F_SEQ_NUMBER))) 3861 return -EINVAL; 3862 if (unlikely(size != sizeof(struct bpf_tunnel_key))) { 3863 switch (size) { 3864 case offsetof(struct bpf_tunnel_key, tunnel_label): 3865 case offsetof(struct bpf_tunnel_key, tunnel_ext): 3866 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): 3867 /* Fixup deprecated structure layouts here, so we have 3868 * a common path later on. 3869 */ 3870 memcpy(compat, from, size); 3871 memset(compat + size, 0, sizeof(compat) - size); 3872 from = (const struct bpf_tunnel_key *) compat; 3873 break; 3874 default: 3875 return -EINVAL; 3876 } 3877 } 3878 if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) || 3879 from->tunnel_ext)) 3880 return -EINVAL; 3881 3882 skb_dst_drop(skb); 3883 dst_hold((struct dst_entry *) md); 3884 skb_dst_set(skb, (struct dst_entry *) md); 3885 3886 info = &md->u.tun_info; 3887 memset(info, 0, sizeof(*info)); 3888 info->mode = IP_TUNNEL_INFO_TX; 3889 3890 info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE; 3891 if (flags & BPF_F_DONT_FRAGMENT) 3892 info->key.tun_flags |= TUNNEL_DONT_FRAGMENT; 3893 if (flags & BPF_F_ZERO_CSUM_TX) 3894 info->key.tun_flags &= ~TUNNEL_CSUM; 3895 if (flags & BPF_F_SEQ_NUMBER) 3896 info->key.tun_flags |= TUNNEL_SEQ; 3897 3898 info->key.tun_id = cpu_to_be64(from->tunnel_id); 3899 info->key.tos = from->tunnel_tos; 3900 info->key.ttl = from->tunnel_ttl; 3901 3902 if (flags & BPF_F_TUNINFO_IPV6) { 3903 info->mode |= IP_TUNNEL_INFO_IPV6; 3904 memcpy(&info->key.u.ipv6.dst, from->remote_ipv6, 3905 sizeof(from->remote_ipv6)); 3906 info->key.label = cpu_to_be32(from->tunnel_label) & 3907 IPV6_FLOWLABEL_MASK; 3908 } else { 3909 info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4); 3910 } 3911 3912 return 0; 3913 } 3914 3915 static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = { 3916 .func = bpf_skb_set_tunnel_key, 3917 .gpl_only = false, 3918 .ret_type = RET_INTEGER, 3919 .arg1_type = ARG_PTR_TO_CTX, 3920 .arg2_type = ARG_PTR_TO_MEM, 3921 .arg3_type = ARG_CONST_SIZE, 3922 .arg4_type = ARG_ANYTHING, 3923 }; 3924 3925 BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb, 3926 const u8 *, from, u32, size) 3927 { 3928 struct ip_tunnel_info *info = skb_tunnel_info(skb); 3929 const struct metadata_dst *md = this_cpu_ptr(md_dst); 3930 3931 if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1)))) 3932 return -EINVAL; 3933 if (unlikely(size > IP_TUNNEL_OPTS_MAX)) 3934 return -ENOMEM; 3935 3936 ip_tunnel_info_opts_set(info, from, size, TUNNEL_OPTIONS_PRESENT); 3937 3938 return 0; 3939 } 3940 3941 static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = { 3942 .func = bpf_skb_set_tunnel_opt, 3943 .gpl_only = false, 3944 .ret_type = RET_INTEGER, 3945 .arg1_type = ARG_PTR_TO_CTX, 3946 .arg2_type = ARG_PTR_TO_MEM, 3947 .arg3_type = ARG_CONST_SIZE, 3948 }; 3949 3950 static const struct bpf_func_proto * 3951 bpf_get_skb_set_tunnel_proto(enum bpf_func_id which) 3952 { 3953 if (!md_dst) { 3954 struct metadata_dst __percpu *tmp; 3955 3956 tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX, 3957 METADATA_IP_TUNNEL, 3958 GFP_KERNEL); 3959 if (!tmp) 3960 return NULL; 3961 if (cmpxchg(&md_dst, NULL, tmp)) 3962 metadata_dst_free_percpu(tmp); 3963 } 3964 3965 switch (which) { 3966 case BPF_FUNC_skb_set_tunnel_key: 3967 return &bpf_skb_set_tunnel_key_proto; 3968 case BPF_FUNC_skb_set_tunnel_opt: 3969 return &bpf_skb_set_tunnel_opt_proto; 3970 default: 3971 return NULL; 3972 } 3973 } 3974 3975 BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map, 3976 u32, idx) 3977 { 3978 struct bpf_array *array = container_of(map, struct bpf_array, map); 3979 struct cgroup *cgrp; 3980 struct sock *sk; 3981 3982 sk = skb_to_full_sk(skb); 3983 if (!sk || !sk_fullsock(sk)) 3984 return -ENOENT; 3985 if (unlikely(idx >= array->map.max_entries)) 3986 return -E2BIG; 3987 3988 cgrp = READ_ONCE(array->ptrs[idx]); 3989 if (unlikely(!cgrp)) 3990 return -EAGAIN; 3991 3992 return sk_under_cgroup_hierarchy(sk, cgrp); 3993 } 3994 3995 static const struct bpf_func_proto bpf_skb_under_cgroup_proto = { 3996 .func = bpf_skb_under_cgroup, 3997 .gpl_only = false, 3998 .ret_type = RET_INTEGER, 3999 .arg1_type = ARG_PTR_TO_CTX, 4000 .arg2_type = ARG_CONST_MAP_PTR, 4001 .arg3_type = ARG_ANYTHING, 4002 }; 4003 4004 #ifdef CONFIG_SOCK_CGROUP_DATA 4005 BPF_CALL_1(bpf_skb_cgroup_id, const struct sk_buff *, skb) 4006 { 4007 struct sock *sk = skb_to_full_sk(skb); 4008 struct cgroup *cgrp; 4009 4010 if (!sk || !sk_fullsock(sk)) 4011 return 0; 4012 4013 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); 4014 return cgroup_id(cgrp); 4015 } 4016 4017 static const struct bpf_func_proto bpf_skb_cgroup_id_proto = { 4018 .func = bpf_skb_cgroup_id, 4019 .gpl_only = false, 4020 .ret_type = RET_INTEGER, 4021 .arg1_type = ARG_PTR_TO_CTX, 4022 }; 4023 4024 BPF_CALL_2(bpf_skb_ancestor_cgroup_id, const struct sk_buff *, skb, int, 4025 ancestor_level) 4026 { 4027 struct sock *sk = skb_to_full_sk(skb); 4028 struct cgroup *ancestor; 4029 struct cgroup *cgrp; 4030 4031 if (!sk || !sk_fullsock(sk)) 4032 return 0; 4033 4034 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); 4035 ancestor = cgroup_ancestor(cgrp, ancestor_level); 4036 if (!ancestor) 4037 return 0; 4038 4039 return cgroup_id(ancestor); 4040 } 4041 4042 static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto = { 4043 .func = bpf_skb_ancestor_cgroup_id, 4044 .gpl_only = false, 4045 .ret_type = RET_INTEGER, 4046 .arg1_type = ARG_PTR_TO_CTX, 4047 .arg2_type = ARG_ANYTHING, 4048 }; 4049 #endif 4050 4051 static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff, 4052 unsigned long off, unsigned long len) 4053 { 4054 memcpy(dst_buff, src_buff + off, len); 4055 return 0; 4056 } 4057 4058 BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map, 4059 u64, flags, void *, meta, u64, meta_size) 4060 { 4061 u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32; 4062 4063 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) 4064 return -EINVAL; 4065 if (unlikely(xdp_size > (unsigned long)(xdp->data_end - xdp->data))) 4066 return -EFAULT; 4067 4068 return bpf_event_output(map, flags, meta, meta_size, xdp->data, 4069 xdp_size, bpf_xdp_copy); 4070 } 4071 4072 static const struct bpf_func_proto bpf_xdp_event_output_proto = { 4073 .func = bpf_xdp_event_output, 4074 .gpl_only = true, 4075 .ret_type = RET_INTEGER, 4076 .arg1_type = ARG_PTR_TO_CTX, 4077 .arg2_type = ARG_CONST_MAP_PTR, 4078 .arg3_type = ARG_ANYTHING, 4079 .arg4_type = ARG_PTR_TO_MEM, 4080 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4081 }; 4082 4083 BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb) 4084 { 4085 return skb->sk ? sock_gen_cookie(skb->sk) : 0; 4086 } 4087 4088 static const struct bpf_func_proto bpf_get_socket_cookie_proto = { 4089 .func = bpf_get_socket_cookie, 4090 .gpl_only = false, 4091 .ret_type = RET_INTEGER, 4092 .arg1_type = ARG_PTR_TO_CTX, 4093 }; 4094 4095 BPF_CALL_1(bpf_get_socket_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx) 4096 { 4097 return sock_gen_cookie(ctx->sk); 4098 } 4099 4100 static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto = { 4101 .func = bpf_get_socket_cookie_sock_addr, 4102 .gpl_only = false, 4103 .ret_type = RET_INTEGER, 4104 .arg1_type = ARG_PTR_TO_CTX, 4105 }; 4106 4107 BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx) 4108 { 4109 return sock_gen_cookie(ctx->sk); 4110 } 4111 4112 static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto = { 4113 .func = bpf_get_socket_cookie_sock_ops, 4114 .gpl_only = false, 4115 .ret_type = RET_INTEGER, 4116 .arg1_type = ARG_PTR_TO_CTX, 4117 }; 4118 4119 BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb) 4120 { 4121 struct sock *sk = sk_to_full_sk(skb->sk); 4122 kuid_t kuid; 4123 4124 if (!sk || !sk_fullsock(sk)) 4125 return overflowuid; 4126 kuid = sock_net_uid(sock_net(sk), sk); 4127 return from_kuid_munged(sock_net(sk)->user_ns, kuid); 4128 } 4129 4130 static const struct bpf_func_proto bpf_get_socket_uid_proto = { 4131 .func = bpf_get_socket_uid, 4132 .gpl_only = false, 4133 .ret_type = RET_INTEGER, 4134 .arg1_type = ARG_PTR_TO_CTX, 4135 }; 4136 4137 BPF_CALL_5(bpf_sockopt_event_output, struct bpf_sock_ops_kern *, bpf_sock, 4138 struct bpf_map *, map, u64, flags, void *, data, u64, size) 4139 { 4140 if (unlikely(flags & ~(BPF_F_INDEX_MASK))) 4141 return -EINVAL; 4142 4143 return bpf_event_output(map, flags, data, size, NULL, 0, NULL); 4144 } 4145 4146 static const struct bpf_func_proto bpf_sockopt_event_output_proto = { 4147 .func = bpf_sockopt_event_output, 4148 .gpl_only = true, 4149 .ret_type = RET_INTEGER, 4150 .arg1_type = ARG_PTR_TO_CTX, 4151 .arg2_type = ARG_CONST_MAP_PTR, 4152 .arg3_type = ARG_ANYTHING, 4153 .arg4_type = ARG_PTR_TO_MEM, 4154 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4155 }; 4156 4157 BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, 4158 int, level, int, optname, char *, optval, int, optlen) 4159 { 4160 struct sock *sk = bpf_sock->sk; 4161 int ret = 0; 4162 int val; 4163 4164 if (!sk_fullsock(sk)) 4165 return -EINVAL; 4166 4167 if (level == SOL_SOCKET) { 4168 if (optlen != sizeof(int)) 4169 return -EINVAL; 4170 val = *((int *)optval); 4171 4172 /* Only some socketops are supported */ 4173 switch (optname) { 4174 case SO_RCVBUF: 4175 val = min_t(u32, val, sysctl_rmem_max); 4176 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 4177 WRITE_ONCE(sk->sk_rcvbuf, 4178 max_t(int, val * 2, SOCK_MIN_RCVBUF)); 4179 break; 4180 case SO_SNDBUF: 4181 val = min_t(u32, val, sysctl_wmem_max); 4182 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 4183 WRITE_ONCE(sk->sk_sndbuf, 4184 max_t(int, val * 2, SOCK_MIN_SNDBUF)); 4185 break; 4186 case SO_MAX_PACING_RATE: /* 32bit version */ 4187 if (val != ~0U) 4188 cmpxchg(&sk->sk_pacing_status, 4189 SK_PACING_NONE, 4190 SK_PACING_NEEDED); 4191 sk->sk_max_pacing_rate = (val == ~0U) ? ~0UL : val; 4192 sk->sk_pacing_rate = min(sk->sk_pacing_rate, 4193 sk->sk_max_pacing_rate); 4194 break; 4195 case SO_PRIORITY: 4196 sk->sk_priority = val; 4197 break; 4198 case SO_RCVLOWAT: 4199 if (val < 0) 4200 val = INT_MAX; 4201 WRITE_ONCE(sk->sk_rcvlowat, val ? : 1); 4202 break; 4203 case SO_MARK: 4204 if (sk->sk_mark != val) { 4205 sk->sk_mark = val; 4206 sk_dst_reset(sk); 4207 } 4208 break; 4209 default: 4210 ret = -EINVAL; 4211 } 4212 #ifdef CONFIG_INET 4213 } else if (level == SOL_IP) { 4214 if (optlen != sizeof(int) || sk->sk_family != AF_INET) 4215 return -EINVAL; 4216 4217 val = *((int *)optval); 4218 /* Only some options are supported */ 4219 switch (optname) { 4220 case IP_TOS: 4221 if (val < -1 || val > 0xff) { 4222 ret = -EINVAL; 4223 } else { 4224 struct inet_sock *inet = inet_sk(sk); 4225 4226 if (val == -1) 4227 val = 0; 4228 inet->tos = val; 4229 } 4230 break; 4231 default: 4232 ret = -EINVAL; 4233 } 4234 #if IS_ENABLED(CONFIG_IPV6) 4235 } else if (level == SOL_IPV6) { 4236 if (optlen != sizeof(int) || sk->sk_family != AF_INET6) 4237 return -EINVAL; 4238 4239 val = *((int *)optval); 4240 /* Only some options are supported */ 4241 switch (optname) { 4242 case IPV6_TCLASS: 4243 if (val < -1 || val > 0xff) { 4244 ret = -EINVAL; 4245 } else { 4246 struct ipv6_pinfo *np = inet6_sk(sk); 4247 4248 if (val == -1) 4249 val = 0; 4250 np->tclass = val; 4251 } 4252 break; 4253 default: 4254 ret = -EINVAL; 4255 } 4256 #endif 4257 } else if (level == SOL_TCP && 4258 sk->sk_prot->setsockopt == tcp_setsockopt) { 4259 if (optname == TCP_CONGESTION) { 4260 char name[TCP_CA_NAME_MAX]; 4261 bool reinit = bpf_sock->op > BPF_SOCK_OPS_NEEDS_ECN; 4262 4263 strncpy(name, optval, min_t(long, optlen, 4264 TCP_CA_NAME_MAX-1)); 4265 name[TCP_CA_NAME_MAX-1] = 0; 4266 ret = tcp_set_congestion_control(sk, name, false, 4267 reinit, true); 4268 } else { 4269 struct tcp_sock *tp = tcp_sk(sk); 4270 4271 if (optlen != sizeof(int)) 4272 return -EINVAL; 4273 4274 val = *((int *)optval); 4275 /* Only some options are supported */ 4276 switch (optname) { 4277 case TCP_BPF_IW: 4278 if (val <= 0 || tp->data_segs_out > tp->syn_data) 4279 ret = -EINVAL; 4280 else 4281 tp->snd_cwnd = val; 4282 break; 4283 case TCP_BPF_SNDCWND_CLAMP: 4284 if (val <= 0) { 4285 ret = -EINVAL; 4286 } else { 4287 tp->snd_cwnd_clamp = val; 4288 tp->snd_ssthresh = val; 4289 } 4290 break; 4291 case TCP_SAVE_SYN: 4292 if (val < 0 || val > 1) 4293 ret = -EINVAL; 4294 else 4295 tp->save_syn = val; 4296 break; 4297 default: 4298 ret = -EINVAL; 4299 } 4300 } 4301 #endif 4302 } else { 4303 ret = -EINVAL; 4304 } 4305 return ret; 4306 } 4307 4308 static const struct bpf_func_proto bpf_setsockopt_proto = { 4309 .func = bpf_setsockopt, 4310 .gpl_only = false, 4311 .ret_type = RET_INTEGER, 4312 .arg1_type = ARG_PTR_TO_CTX, 4313 .arg2_type = ARG_ANYTHING, 4314 .arg3_type = ARG_ANYTHING, 4315 .arg4_type = ARG_PTR_TO_MEM, 4316 .arg5_type = ARG_CONST_SIZE, 4317 }; 4318 4319 BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock, 4320 int, level, int, optname, char *, optval, int, optlen) 4321 { 4322 struct sock *sk = bpf_sock->sk; 4323 4324 if (!sk_fullsock(sk)) 4325 goto err_clear; 4326 #ifdef CONFIG_INET 4327 if (level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) { 4328 struct inet_connection_sock *icsk; 4329 struct tcp_sock *tp; 4330 4331 switch (optname) { 4332 case TCP_CONGESTION: 4333 icsk = inet_csk(sk); 4334 4335 if (!icsk->icsk_ca_ops || optlen <= 1) 4336 goto err_clear; 4337 strncpy(optval, icsk->icsk_ca_ops->name, optlen); 4338 optval[optlen - 1] = 0; 4339 break; 4340 case TCP_SAVED_SYN: 4341 tp = tcp_sk(sk); 4342 4343 if (optlen <= 0 || !tp->saved_syn || 4344 optlen > tp->saved_syn[0]) 4345 goto err_clear; 4346 memcpy(optval, tp->saved_syn + 1, optlen); 4347 break; 4348 default: 4349 goto err_clear; 4350 } 4351 } else if (level == SOL_IP) { 4352 struct inet_sock *inet = inet_sk(sk); 4353 4354 if (optlen != sizeof(int) || sk->sk_family != AF_INET) 4355 goto err_clear; 4356 4357 /* Only some options are supported */ 4358 switch (optname) { 4359 case IP_TOS: 4360 *((int *)optval) = (int)inet->tos; 4361 break; 4362 default: 4363 goto err_clear; 4364 } 4365 #if IS_ENABLED(CONFIG_IPV6) 4366 } else if (level == SOL_IPV6) { 4367 struct ipv6_pinfo *np = inet6_sk(sk); 4368 4369 if (optlen != sizeof(int) || sk->sk_family != AF_INET6) 4370 goto err_clear; 4371 4372 /* Only some options are supported */ 4373 switch (optname) { 4374 case IPV6_TCLASS: 4375 *((int *)optval) = (int)np->tclass; 4376 break; 4377 default: 4378 goto err_clear; 4379 } 4380 #endif 4381 } else { 4382 goto err_clear; 4383 } 4384 return 0; 4385 #endif 4386 err_clear: 4387 memset(optval, 0, optlen); 4388 return -EINVAL; 4389 } 4390 4391 static const struct bpf_func_proto bpf_getsockopt_proto = { 4392 .func = bpf_getsockopt, 4393 .gpl_only = false, 4394 .ret_type = RET_INTEGER, 4395 .arg1_type = ARG_PTR_TO_CTX, 4396 .arg2_type = ARG_ANYTHING, 4397 .arg3_type = ARG_ANYTHING, 4398 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 4399 .arg5_type = ARG_CONST_SIZE, 4400 }; 4401 4402 BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock, 4403 int, argval) 4404 { 4405 struct sock *sk = bpf_sock->sk; 4406 int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS; 4407 4408 if (!IS_ENABLED(CONFIG_INET) || !sk_fullsock(sk)) 4409 return -EINVAL; 4410 4411 tcp_sk(sk)->bpf_sock_ops_cb_flags = val; 4412 4413 return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS); 4414 } 4415 4416 static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = { 4417 .func = bpf_sock_ops_cb_flags_set, 4418 .gpl_only = false, 4419 .ret_type = RET_INTEGER, 4420 .arg1_type = ARG_PTR_TO_CTX, 4421 .arg2_type = ARG_ANYTHING, 4422 }; 4423 4424 const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly; 4425 EXPORT_SYMBOL_GPL(ipv6_bpf_stub); 4426 4427 BPF_CALL_3(bpf_bind, struct bpf_sock_addr_kern *, ctx, struct sockaddr *, addr, 4428 int, addr_len) 4429 { 4430 #ifdef CONFIG_INET 4431 struct sock *sk = ctx->sk; 4432 int err; 4433 4434 /* Binding to port can be expensive so it's prohibited in the helper. 4435 * Only binding to IP is supported. 4436 */ 4437 err = -EINVAL; 4438 if (addr_len < offsetofend(struct sockaddr, sa_family)) 4439 return err; 4440 if (addr->sa_family == AF_INET) { 4441 if (addr_len < sizeof(struct sockaddr_in)) 4442 return err; 4443 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 4444 return err; 4445 return __inet_bind(sk, addr, addr_len, true, false); 4446 #if IS_ENABLED(CONFIG_IPV6) 4447 } else if (addr->sa_family == AF_INET6) { 4448 if (addr_len < SIN6_LEN_RFC2133) 4449 return err; 4450 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 4451 return err; 4452 /* ipv6_bpf_stub cannot be NULL, since it's called from 4453 * bpf_cgroup_inet6_connect hook and ipv6 is already loaded 4454 */ 4455 return ipv6_bpf_stub->inet6_bind(sk, addr, addr_len, true, false); 4456 #endif /* CONFIG_IPV6 */ 4457 } 4458 #endif /* CONFIG_INET */ 4459 4460 return -EAFNOSUPPORT; 4461 } 4462 4463 static const struct bpf_func_proto bpf_bind_proto = { 4464 .func = bpf_bind, 4465 .gpl_only = false, 4466 .ret_type = RET_INTEGER, 4467 .arg1_type = ARG_PTR_TO_CTX, 4468 .arg2_type = ARG_PTR_TO_MEM, 4469 .arg3_type = ARG_CONST_SIZE, 4470 }; 4471 4472 #ifdef CONFIG_XFRM 4473 BPF_CALL_5(bpf_skb_get_xfrm_state, struct sk_buff *, skb, u32, index, 4474 struct bpf_xfrm_state *, to, u32, size, u64, flags) 4475 { 4476 const struct sec_path *sp = skb_sec_path(skb); 4477 const struct xfrm_state *x; 4478 4479 if (!sp || unlikely(index >= sp->len || flags)) 4480 goto err_clear; 4481 4482 x = sp->xvec[index]; 4483 4484 if (unlikely(size != sizeof(struct bpf_xfrm_state))) 4485 goto err_clear; 4486 4487 to->reqid = x->props.reqid; 4488 to->spi = x->id.spi; 4489 to->family = x->props.family; 4490 to->ext = 0; 4491 4492 if (to->family == AF_INET6) { 4493 memcpy(to->remote_ipv6, x->props.saddr.a6, 4494 sizeof(to->remote_ipv6)); 4495 } else { 4496 to->remote_ipv4 = x->props.saddr.a4; 4497 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); 4498 } 4499 4500 return 0; 4501 err_clear: 4502 memset(to, 0, size); 4503 return -EINVAL; 4504 } 4505 4506 static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto = { 4507 .func = bpf_skb_get_xfrm_state, 4508 .gpl_only = false, 4509 .ret_type = RET_INTEGER, 4510 .arg1_type = ARG_PTR_TO_CTX, 4511 .arg2_type = ARG_ANYTHING, 4512 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 4513 .arg4_type = ARG_CONST_SIZE, 4514 .arg5_type = ARG_ANYTHING, 4515 }; 4516 #endif 4517 4518 #if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6) 4519 static int bpf_fib_set_fwd_params(struct bpf_fib_lookup *params, 4520 const struct neighbour *neigh, 4521 const struct net_device *dev) 4522 { 4523 memcpy(params->dmac, neigh->ha, ETH_ALEN); 4524 memcpy(params->smac, dev->dev_addr, ETH_ALEN); 4525 params->h_vlan_TCI = 0; 4526 params->h_vlan_proto = 0; 4527 params->ifindex = dev->ifindex; 4528 4529 return 0; 4530 } 4531 #endif 4532 4533 #if IS_ENABLED(CONFIG_INET) 4534 static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params, 4535 u32 flags, bool check_mtu) 4536 { 4537 struct fib_nh_common *nhc; 4538 struct in_device *in_dev; 4539 struct neighbour *neigh; 4540 struct net_device *dev; 4541 struct fib_result res; 4542 struct flowi4 fl4; 4543 int err; 4544 u32 mtu; 4545 4546 dev = dev_get_by_index_rcu(net, params->ifindex); 4547 if (unlikely(!dev)) 4548 return -ENODEV; 4549 4550 /* verify forwarding is enabled on this interface */ 4551 in_dev = __in_dev_get_rcu(dev); 4552 if (unlikely(!in_dev || !IN_DEV_FORWARD(in_dev))) 4553 return BPF_FIB_LKUP_RET_FWD_DISABLED; 4554 4555 if (flags & BPF_FIB_LOOKUP_OUTPUT) { 4556 fl4.flowi4_iif = 1; 4557 fl4.flowi4_oif = params->ifindex; 4558 } else { 4559 fl4.flowi4_iif = params->ifindex; 4560 fl4.flowi4_oif = 0; 4561 } 4562 fl4.flowi4_tos = params->tos & IPTOS_RT_MASK; 4563 fl4.flowi4_scope = RT_SCOPE_UNIVERSE; 4564 fl4.flowi4_flags = 0; 4565 4566 fl4.flowi4_proto = params->l4_protocol; 4567 fl4.daddr = params->ipv4_dst; 4568 fl4.saddr = params->ipv4_src; 4569 fl4.fl4_sport = params->sport; 4570 fl4.fl4_dport = params->dport; 4571 4572 if (flags & BPF_FIB_LOOKUP_DIRECT) { 4573 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; 4574 struct fib_table *tb; 4575 4576 tb = fib_get_table(net, tbid); 4577 if (unlikely(!tb)) 4578 return BPF_FIB_LKUP_RET_NOT_FWDED; 4579 4580 err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); 4581 } else { 4582 fl4.flowi4_mark = 0; 4583 fl4.flowi4_secid = 0; 4584 fl4.flowi4_tun_key.tun_id = 0; 4585 fl4.flowi4_uid = sock_net_uid(net, NULL); 4586 4587 err = fib_lookup(net, &fl4, &res, FIB_LOOKUP_NOREF); 4588 } 4589 4590 if (err) { 4591 /* map fib lookup errors to RTN_ type */ 4592 if (err == -EINVAL) 4593 return BPF_FIB_LKUP_RET_BLACKHOLE; 4594 if (err == -EHOSTUNREACH) 4595 return BPF_FIB_LKUP_RET_UNREACHABLE; 4596 if (err == -EACCES) 4597 return BPF_FIB_LKUP_RET_PROHIBIT; 4598 4599 return BPF_FIB_LKUP_RET_NOT_FWDED; 4600 } 4601 4602 if (res.type != RTN_UNICAST) 4603 return BPF_FIB_LKUP_RET_NOT_FWDED; 4604 4605 if (fib_info_num_path(res.fi) > 1) 4606 fib_select_path(net, &res, &fl4, NULL); 4607 4608 if (check_mtu) { 4609 mtu = ip_mtu_from_fib_result(&res, params->ipv4_dst); 4610 if (params->tot_len > mtu) 4611 return BPF_FIB_LKUP_RET_FRAG_NEEDED; 4612 } 4613 4614 nhc = res.nhc; 4615 4616 /* do not handle lwt encaps right now */ 4617 if (nhc->nhc_lwtstate) 4618 return BPF_FIB_LKUP_RET_UNSUPP_LWT; 4619 4620 dev = nhc->nhc_dev; 4621 4622 params->rt_metric = res.fi->fib_priority; 4623 4624 /* xdp and cls_bpf programs are run in RCU-bh so 4625 * rcu_read_lock_bh is not needed here 4626 */ 4627 if (likely(nhc->nhc_gw_family != AF_INET6)) { 4628 if (nhc->nhc_gw_family) 4629 params->ipv4_dst = nhc->nhc_gw.ipv4; 4630 4631 neigh = __ipv4_neigh_lookup_noref(dev, 4632 (__force u32)params->ipv4_dst); 4633 } else { 4634 struct in6_addr *dst = (struct in6_addr *)params->ipv6_dst; 4635 4636 params->family = AF_INET6; 4637 *dst = nhc->nhc_gw.ipv6; 4638 neigh = __ipv6_neigh_lookup_noref_stub(dev, dst); 4639 } 4640 4641 if (!neigh) 4642 return BPF_FIB_LKUP_RET_NO_NEIGH; 4643 4644 return bpf_fib_set_fwd_params(params, neigh, dev); 4645 } 4646 #endif 4647 4648 #if IS_ENABLED(CONFIG_IPV6) 4649 static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params, 4650 u32 flags, bool check_mtu) 4651 { 4652 struct in6_addr *src = (struct in6_addr *) params->ipv6_src; 4653 struct in6_addr *dst = (struct in6_addr *) params->ipv6_dst; 4654 struct fib6_result res = {}; 4655 struct neighbour *neigh; 4656 struct net_device *dev; 4657 struct inet6_dev *idev; 4658 struct flowi6 fl6; 4659 int strict = 0; 4660 int oif, err; 4661 u32 mtu; 4662 4663 /* link local addresses are never forwarded */ 4664 if (rt6_need_strict(dst) || rt6_need_strict(src)) 4665 return BPF_FIB_LKUP_RET_NOT_FWDED; 4666 4667 dev = dev_get_by_index_rcu(net, params->ifindex); 4668 if (unlikely(!dev)) 4669 return -ENODEV; 4670 4671 idev = __in6_dev_get_safely(dev); 4672 if (unlikely(!idev || !idev->cnf.forwarding)) 4673 return BPF_FIB_LKUP_RET_FWD_DISABLED; 4674 4675 if (flags & BPF_FIB_LOOKUP_OUTPUT) { 4676 fl6.flowi6_iif = 1; 4677 oif = fl6.flowi6_oif = params->ifindex; 4678 } else { 4679 oif = fl6.flowi6_iif = params->ifindex; 4680 fl6.flowi6_oif = 0; 4681 strict = RT6_LOOKUP_F_HAS_SADDR; 4682 } 4683 fl6.flowlabel = params->flowinfo; 4684 fl6.flowi6_scope = 0; 4685 fl6.flowi6_flags = 0; 4686 fl6.mp_hash = 0; 4687 4688 fl6.flowi6_proto = params->l4_protocol; 4689 fl6.daddr = *dst; 4690 fl6.saddr = *src; 4691 fl6.fl6_sport = params->sport; 4692 fl6.fl6_dport = params->dport; 4693 4694 if (flags & BPF_FIB_LOOKUP_DIRECT) { 4695 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; 4696 struct fib6_table *tb; 4697 4698 tb = ipv6_stub->fib6_get_table(net, tbid); 4699 if (unlikely(!tb)) 4700 return BPF_FIB_LKUP_RET_NOT_FWDED; 4701 4702 err = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6, &res, 4703 strict); 4704 } else { 4705 fl6.flowi6_mark = 0; 4706 fl6.flowi6_secid = 0; 4707 fl6.flowi6_tun_key.tun_id = 0; 4708 fl6.flowi6_uid = sock_net_uid(net, NULL); 4709 4710 err = ipv6_stub->fib6_lookup(net, oif, &fl6, &res, strict); 4711 } 4712 4713 if (unlikely(err || IS_ERR_OR_NULL(res.f6i) || 4714 res.f6i == net->ipv6.fib6_null_entry)) 4715 return BPF_FIB_LKUP_RET_NOT_FWDED; 4716 4717 switch (res.fib6_type) { 4718 /* only unicast is forwarded */ 4719 case RTN_UNICAST: 4720 break; 4721 case RTN_BLACKHOLE: 4722 return BPF_FIB_LKUP_RET_BLACKHOLE; 4723 case RTN_UNREACHABLE: 4724 return BPF_FIB_LKUP_RET_UNREACHABLE; 4725 case RTN_PROHIBIT: 4726 return BPF_FIB_LKUP_RET_PROHIBIT; 4727 default: 4728 return BPF_FIB_LKUP_RET_NOT_FWDED; 4729 } 4730 4731 ipv6_stub->fib6_select_path(net, &res, &fl6, fl6.flowi6_oif, 4732 fl6.flowi6_oif != 0, NULL, strict); 4733 4734 if (check_mtu) { 4735 mtu = ipv6_stub->ip6_mtu_from_fib6(&res, dst, src); 4736 if (params->tot_len > mtu) 4737 return BPF_FIB_LKUP_RET_FRAG_NEEDED; 4738 } 4739 4740 if (res.nh->fib_nh_lws) 4741 return BPF_FIB_LKUP_RET_UNSUPP_LWT; 4742 4743 if (res.nh->fib_nh_gw_family) 4744 *dst = res.nh->fib_nh_gw6; 4745 4746 dev = res.nh->fib_nh_dev; 4747 params->rt_metric = res.f6i->fib6_metric; 4748 4749 /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is 4750 * not needed here. 4751 */ 4752 neigh = __ipv6_neigh_lookup_noref_stub(dev, dst); 4753 if (!neigh) 4754 return BPF_FIB_LKUP_RET_NO_NEIGH; 4755 4756 return bpf_fib_set_fwd_params(params, neigh, dev); 4757 } 4758 #endif 4759 4760 BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx, 4761 struct bpf_fib_lookup *, params, int, plen, u32, flags) 4762 { 4763 if (plen < sizeof(*params)) 4764 return -EINVAL; 4765 4766 if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT)) 4767 return -EINVAL; 4768 4769 switch (params->family) { 4770 #if IS_ENABLED(CONFIG_INET) 4771 case AF_INET: 4772 return bpf_ipv4_fib_lookup(dev_net(ctx->rxq->dev), params, 4773 flags, true); 4774 #endif 4775 #if IS_ENABLED(CONFIG_IPV6) 4776 case AF_INET6: 4777 return bpf_ipv6_fib_lookup(dev_net(ctx->rxq->dev), params, 4778 flags, true); 4779 #endif 4780 } 4781 return -EAFNOSUPPORT; 4782 } 4783 4784 static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = { 4785 .func = bpf_xdp_fib_lookup, 4786 .gpl_only = true, 4787 .ret_type = RET_INTEGER, 4788 .arg1_type = ARG_PTR_TO_CTX, 4789 .arg2_type = ARG_PTR_TO_MEM, 4790 .arg3_type = ARG_CONST_SIZE, 4791 .arg4_type = ARG_ANYTHING, 4792 }; 4793 4794 BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb, 4795 struct bpf_fib_lookup *, params, int, plen, u32, flags) 4796 { 4797 struct net *net = dev_net(skb->dev); 4798 int rc = -EAFNOSUPPORT; 4799 4800 if (plen < sizeof(*params)) 4801 return -EINVAL; 4802 4803 if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT)) 4804 return -EINVAL; 4805 4806 switch (params->family) { 4807 #if IS_ENABLED(CONFIG_INET) 4808 case AF_INET: 4809 rc = bpf_ipv4_fib_lookup(net, params, flags, false); 4810 break; 4811 #endif 4812 #if IS_ENABLED(CONFIG_IPV6) 4813 case AF_INET6: 4814 rc = bpf_ipv6_fib_lookup(net, params, flags, false); 4815 break; 4816 #endif 4817 } 4818 4819 if (!rc) { 4820 struct net_device *dev; 4821 4822 dev = dev_get_by_index_rcu(net, params->ifindex); 4823 if (!is_skb_forwardable(dev, skb)) 4824 rc = BPF_FIB_LKUP_RET_FRAG_NEEDED; 4825 } 4826 4827 return rc; 4828 } 4829 4830 static const struct bpf_func_proto bpf_skb_fib_lookup_proto = { 4831 .func = bpf_skb_fib_lookup, 4832 .gpl_only = true, 4833 .ret_type = RET_INTEGER, 4834 .arg1_type = ARG_PTR_TO_CTX, 4835 .arg2_type = ARG_PTR_TO_MEM, 4836 .arg3_type = ARG_CONST_SIZE, 4837 .arg4_type = ARG_ANYTHING, 4838 }; 4839 4840 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 4841 static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len) 4842 { 4843 int err; 4844 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)hdr; 4845 4846 if (!seg6_validate_srh(srh, len)) 4847 return -EINVAL; 4848 4849 switch (type) { 4850 case BPF_LWT_ENCAP_SEG6_INLINE: 4851 if (skb->protocol != htons(ETH_P_IPV6)) 4852 return -EBADMSG; 4853 4854 err = seg6_do_srh_inline(skb, srh); 4855 break; 4856 case BPF_LWT_ENCAP_SEG6: 4857 skb_reset_inner_headers(skb); 4858 skb->encapsulation = 1; 4859 err = seg6_do_srh_encap(skb, srh, IPPROTO_IPV6); 4860 break; 4861 default: 4862 return -EINVAL; 4863 } 4864 4865 bpf_compute_data_pointers(skb); 4866 if (err) 4867 return err; 4868 4869 ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); 4870 skb_set_transport_header(skb, sizeof(struct ipv6hdr)); 4871 4872 return seg6_lookup_nexthop(skb, NULL, 0); 4873 } 4874 #endif /* CONFIG_IPV6_SEG6_BPF */ 4875 4876 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 4877 static int bpf_push_ip_encap(struct sk_buff *skb, void *hdr, u32 len, 4878 bool ingress) 4879 { 4880 return bpf_lwt_push_ip_encap(skb, hdr, len, ingress); 4881 } 4882 #endif 4883 4884 BPF_CALL_4(bpf_lwt_in_push_encap, struct sk_buff *, skb, u32, type, void *, hdr, 4885 u32, len) 4886 { 4887 switch (type) { 4888 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 4889 case BPF_LWT_ENCAP_SEG6: 4890 case BPF_LWT_ENCAP_SEG6_INLINE: 4891 return bpf_push_seg6_encap(skb, type, hdr, len); 4892 #endif 4893 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 4894 case BPF_LWT_ENCAP_IP: 4895 return bpf_push_ip_encap(skb, hdr, len, true /* ingress */); 4896 #endif 4897 default: 4898 return -EINVAL; 4899 } 4900 } 4901 4902 BPF_CALL_4(bpf_lwt_xmit_push_encap, struct sk_buff *, skb, u32, type, 4903 void *, hdr, u32, len) 4904 { 4905 switch (type) { 4906 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 4907 case BPF_LWT_ENCAP_IP: 4908 return bpf_push_ip_encap(skb, hdr, len, false /* egress */); 4909 #endif 4910 default: 4911 return -EINVAL; 4912 } 4913 } 4914 4915 static const struct bpf_func_proto bpf_lwt_in_push_encap_proto = { 4916 .func = bpf_lwt_in_push_encap, 4917 .gpl_only = false, 4918 .ret_type = RET_INTEGER, 4919 .arg1_type = ARG_PTR_TO_CTX, 4920 .arg2_type = ARG_ANYTHING, 4921 .arg3_type = ARG_PTR_TO_MEM, 4922 .arg4_type = ARG_CONST_SIZE 4923 }; 4924 4925 static const struct bpf_func_proto bpf_lwt_xmit_push_encap_proto = { 4926 .func = bpf_lwt_xmit_push_encap, 4927 .gpl_only = false, 4928 .ret_type = RET_INTEGER, 4929 .arg1_type = ARG_PTR_TO_CTX, 4930 .arg2_type = ARG_ANYTHING, 4931 .arg3_type = ARG_PTR_TO_MEM, 4932 .arg4_type = ARG_CONST_SIZE 4933 }; 4934 4935 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 4936 BPF_CALL_4(bpf_lwt_seg6_store_bytes, struct sk_buff *, skb, u32, offset, 4937 const void *, from, u32, len) 4938 { 4939 struct seg6_bpf_srh_state *srh_state = 4940 this_cpu_ptr(&seg6_bpf_srh_states); 4941 struct ipv6_sr_hdr *srh = srh_state->srh; 4942 void *srh_tlvs, *srh_end, *ptr; 4943 int srhoff = 0; 4944 4945 if (srh == NULL) 4946 return -EINVAL; 4947 4948 srh_tlvs = (void *)((char *)srh + ((srh->first_segment + 1) << 4)); 4949 srh_end = (void *)((char *)srh + sizeof(*srh) + srh_state->hdrlen); 4950 4951 ptr = skb->data + offset; 4952 if (ptr >= srh_tlvs && ptr + len <= srh_end) 4953 srh_state->valid = false; 4954 else if (ptr < (void *)&srh->flags || 4955 ptr + len > (void *)&srh->segments) 4956 return -EFAULT; 4957 4958 if (unlikely(bpf_try_make_writable(skb, offset + len))) 4959 return -EFAULT; 4960 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) 4961 return -EINVAL; 4962 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 4963 4964 memcpy(skb->data + offset, from, len); 4965 return 0; 4966 } 4967 4968 static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto = { 4969 .func = bpf_lwt_seg6_store_bytes, 4970 .gpl_only = false, 4971 .ret_type = RET_INTEGER, 4972 .arg1_type = ARG_PTR_TO_CTX, 4973 .arg2_type = ARG_ANYTHING, 4974 .arg3_type = ARG_PTR_TO_MEM, 4975 .arg4_type = ARG_CONST_SIZE 4976 }; 4977 4978 static void bpf_update_srh_state(struct sk_buff *skb) 4979 { 4980 struct seg6_bpf_srh_state *srh_state = 4981 this_cpu_ptr(&seg6_bpf_srh_states); 4982 int srhoff = 0; 4983 4984 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) { 4985 srh_state->srh = NULL; 4986 } else { 4987 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 4988 srh_state->hdrlen = srh_state->srh->hdrlen << 3; 4989 srh_state->valid = true; 4990 } 4991 } 4992 4993 BPF_CALL_4(bpf_lwt_seg6_action, struct sk_buff *, skb, 4994 u32, action, void *, param, u32, param_len) 4995 { 4996 struct seg6_bpf_srh_state *srh_state = 4997 this_cpu_ptr(&seg6_bpf_srh_states); 4998 int hdroff = 0; 4999 int err; 5000 5001 switch (action) { 5002 case SEG6_LOCAL_ACTION_END_X: 5003 if (!seg6_bpf_has_valid_srh(skb)) 5004 return -EBADMSG; 5005 if (param_len != sizeof(struct in6_addr)) 5006 return -EINVAL; 5007 return seg6_lookup_nexthop(skb, (struct in6_addr *)param, 0); 5008 case SEG6_LOCAL_ACTION_END_T: 5009 if (!seg6_bpf_has_valid_srh(skb)) 5010 return -EBADMSG; 5011 if (param_len != sizeof(int)) 5012 return -EINVAL; 5013 return seg6_lookup_nexthop(skb, NULL, *(int *)param); 5014 case SEG6_LOCAL_ACTION_END_DT6: 5015 if (!seg6_bpf_has_valid_srh(skb)) 5016 return -EBADMSG; 5017 if (param_len != sizeof(int)) 5018 return -EINVAL; 5019 5020 if (ipv6_find_hdr(skb, &hdroff, IPPROTO_IPV6, NULL, NULL) < 0) 5021 return -EBADMSG; 5022 if (!pskb_pull(skb, hdroff)) 5023 return -EBADMSG; 5024 5025 skb_postpull_rcsum(skb, skb_network_header(skb), hdroff); 5026 skb_reset_network_header(skb); 5027 skb_reset_transport_header(skb); 5028 skb->encapsulation = 0; 5029 5030 bpf_compute_data_pointers(skb); 5031 bpf_update_srh_state(skb); 5032 return seg6_lookup_nexthop(skb, NULL, *(int *)param); 5033 case SEG6_LOCAL_ACTION_END_B6: 5034 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) 5035 return -EBADMSG; 5036 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6_INLINE, 5037 param, param_len); 5038 if (!err) 5039 bpf_update_srh_state(skb); 5040 5041 return err; 5042 case SEG6_LOCAL_ACTION_END_B6_ENCAP: 5043 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) 5044 return -EBADMSG; 5045 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6, 5046 param, param_len); 5047 if (!err) 5048 bpf_update_srh_state(skb); 5049 5050 return err; 5051 default: 5052 return -EINVAL; 5053 } 5054 } 5055 5056 static const struct bpf_func_proto bpf_lwt_seg6_action_proto = { 5057 .func = bpf_lwt_seg6_action, 5058 .gpl_only = false, 5059 .ret_type = RET_INTEGER, 5060 .arg1_type = ARG_PTR_TO_CTX, 5061 .arg2_type = ARG_ANYTHING, 5062 .arg3_type = ARG_PTR_TO_MEM, 5063 .arg4_type = ARG_CONST_SIZE 5064 }; 5065 5066 BPF_CALL_3(bpf_lwt_seg6_adjust_srh, struct sk_buff *, skb, u32, offset, 5067 s32, len) 5068 { 5069 struct seg6_bpf_srh_state *srh_state = 5070 this_cpu_ptr(&seg6_bpf_srh_states); 5071 struct ipv6_sr_hdr *srh = srh_state->srh; 5072 void *srh_end, *srh_tlvs, *ptr; 5073 struct ipv6hdr *hdr; 5074 int srhoff = 0; 5075 int ret; 5076 5077 if (unlikely(srh == NULL)) 5078 return -EINVAL; 5079 5080 srh_tlvs = (void *)((unsigned char *)srh + sizeof(*srh) + 5081 ((srh->first_segment + 1) << 4)); 5082 srh_end = (void *)((unsigned char *)srh + sizeof(*srh) + 5083 srh_state->hdrlen); 5084 ptr = skb->data + offset; 5085 5086 if (unlikely(ptr < srh_tlvs || ptr > srh_end)) 5087 return -EFAULT; 5088 if (unlikely(len < 0 && (void *)((char *)ptr - len) > srh_end)) 5089 return -EFAULT; 5090 5091 if (len > 0) { 5092 ret = skb_cow_head(skb, len); 5093 if (unlikely(ret < 0)) 5094 return ret; 5095 5096 ret = bpf_skb_net_hdr_push(skb, offset, len); 5097 } else { 5098 ret = bpf_skb_net_hdr_pop(skb, offset, -1 * len); 5099 } 5100 5101 bpf_compute_data_pointers(skb); 5102 if (unlikely(ret < 0)) 5103 return ret; 5104 5105 hdr = (struct ipv6hdr *)skb->data; 5106 hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); 5107 5108 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) 5109 return -EINVAL; 5110 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 5111 srh_state->hdrlen += len; 5112 srh_state->valid = false; 5113 return 0; 5114 } 5115 5116 static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = { 5117 .func = bpf_lwt_seg6_adjust_srh, 5118 .gpl_only = false, 5119 .ret_type = RET_INTEGER, 5120 .arg1_type = ARG_PTR_TO_CTX, 5121 .arg2_type = ARG_ANYTHING, 5122 .arg3_type = ARG_ANYTHING, 5123 }; 5124 #endif /* CONFIG_IPV6_SEG6_BPF */ 5125 5126 #ifdef CONFIG_INET 5127 static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple, 5128 int dif, int sdif, u8 family, u8 proto) 5129 { 5130 bool refcounted = false; 5131 struct sock *sk = NULL; 5132 5133 if (family == AF_INET) { 5134 __be32 src4 = tuple->ipv4.saddr; 5135 __be32 dst4 = tuple->ipv4.daddr; 5136 5137 if (proto == IPPROTO_TCP) 5138 sk = __inet_lookup(net, &tcp_hashinfo, NULL, 0, 5139 src4, tuple->ipv4.sport, 5140 dst4, tuple->ipv4.dport, 5141 dif, sdif, &refcounted); 5142 else 5143 sk = __udp4_lib_lookup(net, src4, tuple->ipv4.sport, 5144 dst4, tuple->ipv4.dport, 5145 dif, sdif, &udp_table, NULL); 5146 #if IS_ENABLED(CONFIG_IPV6) 5147 } else { 5148 struct in6_addr *src6 = (struct in6_addr *)&tuple->ipv6.saddr; 5149 struct in6_addr *dst6 = (struct in6_addr *)&tuple->ipv6.daddr; 5150 5151 if (proto == IPPROTO_TCP) 5152 sk = __inet6_lookup(net, &tcp_hashinfo, NULL, 0, 5153 src6, tuple->ipv6.sport, 5154 dst6, ntohs(tuple->ipv6.dport), 5155 dif, sdif, &refcounted); 5156 else if (likely(ipv6_bpf_stub)) 5157 sk = ipv6_bpf_stub->udp6_lib_lookup(net, 5158 src6, tuple->ipv6.sport, 5159 dst6, tuple->ipv6.dport, 5160 dif, sdif, 5161 &udp_table, NULL); 5162 #endif 5163 } 5164 5165 if (unlikely(sk && !refcounted && !sock_flag(sk, SOCK_RCU_FREE))) { 5166 WARN_ONCE(1, "Found non-RCU, unreferenced socket!"); 5167 sk = NULL; 5168 } 5169 return sk; 5170 } 5171 5172 /* bpf_skc_lookup performs the core lookup for different types of sockets, 5173 * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE. 5174 * Returns the socket as an 'unsigned long' to simplify the casting in the 5175 * callers to satisfy BPF_CALL declarations. 5176 */ 5177 static struct sock * 5178 __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 5179 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, 5180 u64 flags) 5181 { 5182 struct sock *sk = NULL; 5183 u8 family = AF_UNSPEC; 5184 struct net *net; 5185 int sdif; 5186 5187 if (len == sizeof(tuple->ipv4)) 5188 family = AF_INET; 5189 else if (len == sizeof(tuple->ipv6)) 5190 family = AF_INET6; 5191 else 5192 return NULL; 5193 5194 if (unlikely(family == AF_UNSPEC || flags || 5195 !((s32)netns_id < 0 || netns_id <= S32_MAX))) 5196 goto out; 5197 5198 if (family == AF_INET) 5199 sdif = inet_sdif(skb); 5200 else 5201 sdif = inet6_sdif(skb); 5202 5203 if ((s32)netns_id < 0) { 5204 net = caller_net; 5205 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); 5206 } else { 5207 net = get_net_ns_by_id(caller_net, netns_id); 5208 if (unlikely(!net)) 5209 goto out; 5210 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); 5211 put_net(net); 5212 } 5213 5214 out: 5215 return sk; 5216 } 5217 5218 static struct sock * 5219 __bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 5220 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, 5221 u64 flags) 5222 { 5223 struct sock *sk = __bpf_skc_lookup(skb, tuple, len, caller_net, 5224 ifindex, proto, netns_id, flags); 5225 5226 if (sk) { 5227 sk = sk_to_full_sk(sk); 5228 if (!sk_fullsock(sk)) { 5229 sock_gen_put(sk); 5230 return NULL; 5231 } 5232 } 5233 5234 return sk; 5235 } 5236 5237 static struct sock * 5238 bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 5239 u8 proto, u64 netns_id, u64 flags) 5240 { 5241 struct net *caller_net; 5242 int ifindex; 5243 5244 if (skb->dev) { 5245 caller_net = dev_net(skb->dev); 5246 ifindex = skb->dev->ifindex; 5247 } else { 5248 caller_net = sock_net(skb->sk); 5249 ifindex = 0; 5250 } 5251 5252 return __bpf_skc_lookup(skb, tuple, len, caller_net, ifindex, proto, 5253 netns_id, flags); 5254 } 5255 5256 static struct sock * 5257 bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 5258 u8 proto, u64 netns_id, u64 flags) 5259 { 5260 struct sock *sk = bpf_skc_lookup(skb, tuple, len, proto, netns_id, 5261 flags); 5262 5263 if (sk) { 5264 sk = sk_to_full_sk(sk); 5265 if (!sk_fullsock(sk)) { 5266 sock_gen_put(sk); 5267 return NULL; 5268 } 5269 } 5270 5271 return sk; 5272 } 5273 5274 BPF_CALL_5(bpf_skc_lookup_tcp, struct sk_buff *, skb, 5275 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 5276 { 5277 return (unsigned long)bpf_skc_lookup(skb, tuple, len, IPPROTO_TCP, 5278 netns_id, flags); 5279 } 5280 5281 static const struct bpf_func_proto bpf_skc_lookup_tcp_proto = { 5282 .func = bpf_skc_lookup_tcp, 5283 .gpl_only = false, 5284 .pkt_access = true, 5285 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 5286 .arg1_type = ARG_PTR_TO_CTX, 5287 .arg2_type = ARG_PTR_TO_MEM, 5288 .arg3_type = ARG_CONST_SIZE, 5289 .arg4_type = ARG_ANYTHING, 5290 .arg5_type = ARG_ANYTHING, 5291 }; 5292 5293 BPF_CALL_5(bpf_sk_lookup_tcp, struct sk_buff *, skb, 5294 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 5295 { 5296 return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP, 5297 netns_id, flags); 5298 } 5299 5300 static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = { 5301 .func = bpf_sk_lookup_tcp, 5302 .gpl_only = false, 5303 .pkt_access = true, 5304 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5305 .arg1_type = ARG_PTR_TO_CTX, 5306 .arg2_type = ARG_PTR_TO_MEM, 5307 .arg3_type = ARG_CONST_SIZE, 5308 .arg4_type = ARG_ANYTHING, 5309 .arg5_type = ARG_ANYTHING, 5310 }; 5311 5312 BPF_CALL_5(bpf_sk_lookup_udp, struct sk_buff *, skb, 5313 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 5314 { 5315 return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP, 5316 netns_id, flags); 5317 } 5318 5319 static const struct bpf_func_proto bpf_sk_lookup_udp_proto = { 5320 .func = bpf_sk_lookup_udp, 5321 .gpl_only = false, 5322 .pkt_access = true, 5323 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5324 .arg1_type = ARG_PTR_TO_CTX, 5325 .arg2_type = ARG_PTR_TO_MEM, 5326 .arg3_type = ARG_CONST_SIZE, 5327 .arg4_type = ARG_ANYTHING, 5328 .arg5_type = ARG_ANYTHING, 5329 }; 5330 5331 BPF_CALL_1(bpf_sk_release, struct sock *, sk) 5332 { 5333 /* Only full sockets have sk->sk_flags. */ 5334 if (!sk_fullsock(sk) || !sock_flag(sk, SOCK_RCU_FREE)) 5335 sock_gen_put(sk); 5336 return 0; 5337 } 5338 5339 static const struct bpf_func_proto bpf_sk_release_proto = { 5340 .func = bpf_sk_release, 5341 .gpl_only = false, 5342 .ret_type = RET_INTEGER, 5343 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 5344 }; 5345 5346 BPF_CALL_5(bpf_xdp_sk_lookup_udp, struct xdp_buff *, ctx, 5347 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 5348 { 5349 struct net *caller_net = dev_net(ctx->rxq->dev); 5350 int ifindex = ctx->rxq->dev->ifindex; 5351 5352 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, 5353 ifindex, IPPROTO_UDP, netns_id, 5354 flags); 5355 } 5356 5357 static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = { 5358 .func = bpf_xdp_sk_lookup_udp, 5359 .gpl_only = false, 5360 .pkt_access = true, 5361 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5362 .arg1_type = ARG_PTR_TO_CTX, 5363 .arg2_type = ARG_PTR_TO_MEM, 5364 .arg3_type = ARG_CONST_SIZE, 5365 .arg4_type = ARG_ANYTHING, 5366 .arg5_type = ARG_ANYTHING, 5367 }; 5368 5369 BPF_CALL_5(bpf_xdp_skc_lookup_tcp, struct xdp_buff *, ctx, 5370 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 5371 { 5372 struct net *caller_net = dev_net(ctx->rxq->dev); 5373 int ifindex = ctx->rxq->dev->ifindex; 5374 5375 return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, caller_net, 5376 ifindex, IPPROTO_TCP, netns_id, 5377 flags); 5378 } 5379 5380 static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto = { 5381 .func = bpf_xdp_skc_lookup_tcp, 5382 .gpl_only = false, 5383 .pkt_access = true, 5384 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 5385 .arg1_type = ARG_PTR_TO_CTX, 5386 .arg2_type = ARG_PTR_TO_MEM, 5387 .arg3_type = ARG_CONST_SIZE, 5388 .arg4_type = ARG_ANYTHING, 5389 .arg5_type = ARG_ANYTHING, 5390 }; 5391 5392 BPF_CALL_5(bpf_xdp_sk_lookup_tcp, struct xdp_buff *, ctx, 5393 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 5394 { 5395 struct net *caller_net = dev_net(ctx->rxq->dev); 5396 int ifindex = ctx->rxq->dev->ifindex; 5397 5398 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, 5399 ifindex, IPPROTO_TCP, netns_id, 5400 flags); 5401 } 5402 5403 static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = { 5404 .func = bpf_xdp_sk_lookup_tcp, 5405 .gpl_only = false, 5406 .pkt_access = true, 5407 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5408 .arg1_type = ARG_PTR_TO_CTX, 5409 .arg2_type = ARG_PTR_TO_MEM, 5410 .arg3_type = ARG_CONST_SIZE, 5411 .arg4_type = ARG_ANYTHING, 5412 .arg5_type = ARG_ANYTHING, 5413 }; 5414 5415 BPF_CALL_5(bpf_sock_addr_skc_lookup_tcp, struct bpf_sock_addr_kern *, ctx, 5416 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 5417 { 5418 return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, 5419 sock_net(ctx->sk), 0, 5420 IPPROTO_TCP, netns_id, flags); 5421 } 5422 5423 static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto = { 5424 .func = bpf_sock_addr_skc_lookup_tcp, 5425 .gpl_only = false, 5426 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 5427 .arg1_type = ARG_PTR_TO_CTX, 5428 .arg2_type = ARG_PTR_TO_MEM, 5429 .arg3_type = ARG_CONST_SIZE, 5430 .arg4_type = ARG_ANYTHING, 5431 .arg5_type = ARG_ANYTHING, 5432 }; 5433 5434 BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp, struct bpf_sock_addr_kern *, ctx, 5435 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 5436 { 5437 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, 5438 sock_net(ctx->sk), 0, IPPROTO_TCP, 5439 netns_id, flags); 5440 } 5441 5442 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = { 5443 .func = bpf_sock_addr_sk_lookup_tcp, 5444 .gpl_only = false, 5445 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5446 .arg1_type = ARG_PTR_TO_CTX, 5447 .arg2_type = ARG_PTR_TO_MEM, 5448 .arg3_type = ARG_CONST_SIZE, 5449 .arg4_type = ARG_ANYTHING, 5450 .arg5_type = ARG_ANYTHING, 5451 }; 5452 5453 BPF_CALL_5(bpf_sock_addr_sk_lookup_udp, struct bpf_sock_addr_kern *, ctx, 5454 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 5455 { 5456 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, 5457 sock_net(ctx->sk), 0, IPPROTO_UDP, 5458 netns_id, flags); 5459 } 5460 5461 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = { 5462 .func = bpf_sock_addr_sk_lookup_udp, 5463 .gpl_only = false, 5464 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5465 .arg1_type = ARG_PTR_TO_CTX, 5466 .arg2_type = ARG_PTR_TO_MEM, 5467 .arg3_type = ARG_CONST_SIZE, 5468 .arg4_type = ARG_ANYTHING, 5469 .arg5_type = ARG_ANYTHING, 5470 }; 5471 5472 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 5473 struct bpf_insn_access_aux *info) 5474 { 5475 if (off < 0 || off >= offsetofend(struct bpf_tcp_sock, 5476 icsk_retransmits)) 5477 return false; 5478 5479 if (off % size != 0) 5480 return false; 5481 5482 switch (off) { 5483 case offsetof(struct bpf_tcp_sock, bytes_received): 5484 case offsetof(struct bpf_tcp_sock, bytes_acked): 5485 return size == sizeof(__u64); 5486 default: 5487 return size == sizeof(__u32); 5488 } 5489 } 5490 5491 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 5492 const struct bpf_insn *si, 5493 struct bpf_insn *insn_buf, 5494 struct bpf_prog *prog, u32 *target_size) 5495 { 5496 struct bpf_insn *insn = insn_buf; 5497 5498 #define BPF_TCP_SOCK_GET_COMMON(FIELD) \ 5499 do { \ 5500 BUILD_BUG_ON(sizeof_field(struct tcp_sock, FIELD) > \ 5501 sizeof_field(struct bpf_tcp_sock, FIELD)); \ 5502 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_sock, FIELD),\ 5503 si->dst_reg, si->src_reg, \ 5504 offsetof(struct tcp_sock, FIELD)); \ 5505 } while (0) 5506 5507 #define BPF_INET_SOCK_GET_COMMON(FIELD) \ 5508 do { \ 5509 BUILD_BUG_ON(sizeof_field(struct inet_connection_sock, \ 5510 FIELD) > \ 5511 sizeof_field(struct bpf_tcp_sock, FIELD)); \ 5512 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 5513 struct inet_connection_sock, \ 5514 FIELD), \ 5515 si->dst_reg, si->src_reg, \ 5516 offsetof( \ 5517 struct inet_connection_sock, \ 5518 FIELD)); \ 5519 } while (0) 5520 5521 if (insn > insn_buf) 5522 return insn - insn_buf; 5523 5524 switch (si->off) { 5525 case offsetof(struct bpf_tcp_sock, rtt_min): 5526 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) != 5527 sizeof(struct minmax)); 5528 BUILD_BUG_ON(sizeof(struct minmax) < 5529 sizeof(struct minmax_sample)); 5530 5531 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 5532 offsetof(struct tcp_sock, rtt_min) + 5533 offsetof(struct minmax_sample, v)); 5534 break; 5535 case offsetof(struct bpf_tcp_sock, snd_cwnd): 5536 BPF_TCP_SOCK_GET_COMMON(snd_cwnd); 5537 break; 5538 case offsetof(struct bpf_tcp_sock, srtt_us): 5539 BPF_TCP_SOCK_GET_COMMON(srtt_us); 5540 break; 5541 case offsetof(struct bpf_tcp_sock, snd_ssthresh): 5542 BPF_TCP_SOCK_GET_COMMON(snd_ssthresh); 5543 break; 5544 case offsetof(struct bpf_tcp_sock, rcv_nxt): 5545 BPF_TCP_SOCK_GET_COMMON(rcv_nxt); 5546 break; 5547 case offsetof(struct bpf_tcp_sock, snd_nxt): 5548 BPF_TCP_SOCK_GET_COMMON(snd_nxt); 5549 break; 5550 case offsetof(struct bpf_tcp_sock, snd_una): 5551 BPF_TCP_SOCK_GET_COMMON(snd_una); 5552 break; 5553 case offsetof(struct bpf_tcp_sock, mss_cache): 5554 BPF_TCP_SOCK_GET_COMMON(mss_cache); 5555 break; 5556 case offsetof(struct bpf_tcp_sock, ecn_flags): 5557 BPF_TCP_SOCK_GET_COMMON(ecn_flags); 5558 break; 5559 case offsetof(struct bpf_tcp_sock, rate_delivered): 5560 BPF_TCP_SOCK_GET_COMMON(rate_delivered); 5561 break; 5562 case offsetof(struct bpf_tcp_sock, rate_interval_us): 5563 BPF_TCP_SOCK_GET_COMMON(rate_interval_us); 5564 break; 5565 case offsetof(struct bpf_tcp_sock, packets_out): 5566 BPF_TCP_SOCK_GET_COMMON(packets_out); 5567 break; 5568 case offsetof(struct bpf_tcp_sock, retrans_out): 5569 BPF_TCP_SOCK_GET_COMMON(retrans_out); 5570 break; 5571 case offsetof(struct bpf_tcp_sock, total_retrans): 5572 BPF_TCP_SOCK_GET_COMMON(total_retrans); 5573 break; 5574 case offsetof(struct bpf_tcp_sock, segs_in): 5575 BPF_TCP_SOCK_GET_COMMON(segs_in); 5576 break; 5577 case offsetof(struct bpf_tcp_sock, data_segs_in): 5578 BPF_TCP_SOCK_GET_COMMON(data_segs_in); 5579 break; 5580 case offsetof(struct bpf_tcp_sock, segs_out): 5581 BPF_TCP_SOCK_GET_COMMON(segs_out); 5582 break; 5583 case offsetof(struct bpf_tcp_sock, data_segs_out): 5584 BPF_TCP_SOCK_GET_COMMON(data_segs_out); 5585 break; 5586 case offsetof(struct bpf_tcp_sock, lost_out): 5587 BPF_TCP_SOCK_GET_COMMON(lost_out); 5588 break; 5589 case offsetof(struct bpf_tcp_sock, sacked_out): 5590 BPF_TCP_SOCK_GET_COMMON(sacked_out); 5591 break; 5592 case offsetof(struct bpf_tcp_sock, bytes_received): 5593 BPF_TCP_SOCK_GET_COMMON(bytes_received); 5594 break; 5595 case offsetof(struct bpf_tcp_sock, bytes_acked): 5596 BPF_TCP_SOCK_GET_COMMON(bytes_acked); 5597 break; 5598 case offsetof(struct bpf_tcp_sock, dsack_dups): 5599 BPF_TCP_SOCK_GET_COMMON(dsack_dups); 5600 break; 5601 case offsetof(struct bpf_tcp_sock, delivered): 5602 BPF_TCP_SOCK_GET_COMMON(delivered); 5603 break; 5604 case offsetof(struct bpf_tcp_sock, delivered_ce): 5605 BPF_TCP_SOCK_GET_COMMON(delivered_ce); 5606 break; 5607 case offsetof(struct bpf_tcp_sock, icsk_retransmits): 5608 BPF_INET_SOCK_GET_COMMON(icsk_retransmits); 5609 break; 5610 } 5611 5612 return insn - insn_buf; 5613 } 5614 5615 BPF_CALL_1(bpf_tcp_sock, struct sock *, sk) 5616 { 5617 if (sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP) 5618 return (unsigned long)sk; 5619 5620 return (unsigned long)NULL; 5621 } 5622 5623 const struct bpf_func_proto bpf_tcp_sock_proto = { 5624 .func = bpf_tcp_sock, 5625 .gpl_only = false, 5626 .ret_type = RET_PTR_TO_TCP_SOCK_OR_NULL, 5627 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 5628 }; 5629 5630 BPF_CALL_1(bpf_get_listener_sock, struct sock *, sk) 5631 { 5632 sk = sk_to_full_sk(sk); 5633 5634 if (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_RCU_FREE)) 5635 return (unsigned long)sk; 5636 5637 return (unsigned long)NULL; 5638 } 5639 5640 static const struct bpf_func_proto bpf_get_listener_sock_proto = { 5641 .func = bpf_get_listener_sock, 5642 .gpl_only = false, 5643 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5644 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 5645 }; 5646 5647 BPF_CALL_1(bpf_skb_ecn_set_ce, struct sk_buff *, skb) 5648 { 5649 unsigned int iphdr_len; 5650 5651 if (skb->protocol == cpu_to_be16(ETH_P_IP)) 5652 iphdr_len = sizeof(struct iphdr); 5653 else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) 5654 iphdr_len = sizeof(struct ipv6hdr); 5655 else 5656 return 0; 5657 5658 if (skb_headlen(skb) < iphdr_len) 5659 return 0; 5660 5661 if (skb_cloned(skb) && !skb_clone_writable(skb, iphdr_len)) 5662 return 0; 5663 5664 return INET_ECN_set_ce(skb); 5665 } 5666 5667 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 5668 struct bpf_insn_access_aux *info) 5669 { 5670 if (off < 0 || off >= offsetofend(struct bpf_xdp_sock, queue_id)) 5671 return false; 5672 5673 if (off % size != 0) 5674 return false; 5675 5676 switch (off) { 5677 default: 5678 return size == sizeof(__u32); 5679 } 5680 } 5681 5682 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 5683 const struct bpf_insn *si, 5684 struct bpf_insn *insn_buf, 5685 struct bpf_prog *prog, u32 *target_size) 5686 { 5687 struct bpf_insn *insn = insn_buf; 5688 5689 #define BPF_XDP_SOCK_GET(FIELD) \ 5690 do { \ 5691 BUILD_BUG_ON(sizeof_field(struct xdp_sock, FIELD) > \ 5692 sizeof_field(struct bpf_xdp_sock, FIELD)); \ 5693 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_sock, FIELD),\ 5694 si->dst_reg, si->src_reg, \ 5695 offsetof(struct xdp_sock, FIELD)); \ 5696 } while (0) 5697 5698 switch (si->off) { 5699 case offsetof(struct bpf_xdp_sock, queue_id): 5700 BPF_XDP_SOCK_GET(queue_id); 5701 break; 5702 } 5703 5704 return insn - insn_buf; 5705 } 5706 5707 static const struct bpf_func_proto bpf_skb_ecn_set_ce_proto = { 5708 .func = bpf_skb_ecn_set_ce, 5709 .gpl_only = false, 5710 .ret_type = RET_INTEGER, 5711 .arg1_type = ARG_PTR_TO_CTX, 5712 }; 5713 5714 BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len, 5715 struct tcphdr *, th, u32, th_len) 5716 { 5717 #ifdef CONFIG_SYN_COOKIES 5718 u32 cookie; 5719 int ret; 5720 5721 if (unlikely(th_len < sizeof(*th))) 5722 return -EINVAL; 5723 5724 /* sk_listener() allows TCP_NEW_SYN_RECV, which makes no sense here. */ 5725 if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN) 5726 return -EINVAL; 5727 5728 if (!sock_net(sk)->ipv4.sysctl_tcp_syncookies) 5729 return -EINVAL; 5730 5731 if (!th->ack || th->rst || th->syn) 5732 return -ENOENT; 5733 5734 if (tcp_synq_no_recent_overflow(sk)) 5735 return -ENOENT; 5736 5737 cookie = ntohl(th->ack_seq) - 1; 5738 5739 switch (sk->sk_family) { 5740 case AF_INET: 5741 if (unlikely(iph_len < sizeof(struct iphdr))) 5742 return -EINVAL; 5743 5744 ret = __cookie_v4_check((struct iphdr *)iph, th, cookie); 5745 break; 5746 5747 #if IS_BUILTIN(CONFIG_IPV6) 5748 case AF_INET6: 5749 if (unlikely(iph_len < sizeof(struct ipv6hdr))) 5750 return -EINVAL; 5751 5752 ret = __cookie_v6_check((struct ipv6hdr *)iph, th, cookie); 5753 break; 5754 #endif /* CONFIG_IPV6 */ 5755 5756 default: 5757 return -EPROTONOSUPPORT; 5758 } 5759 5760 if (ret > 0) 5761 return 0; 5762 5763 return -ENOENT; 5764 #else 5765 return -ENOTSUPP; 5766 #endif 5767 } 5768 5769 static const struct bpf_func_proto bpf_tcp_check_syncookie_proto = { 5770 .func = bpf_tcp_check_syncookie, 5771 .gpl_only = true, 5772 .pkt_access = true, 5773 .ret_type = RET_INTEGER, 5774 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 5775 .arg2_type = ARG_PTR_TO_MEM, 5776 .arg3_type = ARG_CONST_SIZE, 5777 .arg4_type = ARG_PTR_TO_MEM, 5778 .arg5_type = ARG_CONST_SIZE, 5779 }; 5780 5781 BPF_CALL_5(bpf_tcp_gen_syncookie, struct sock *, sk, void *, iph, u32, iph_len, 5782 struct tcphdr *, th, u32, th_len) 5783 { 5784 #ifdef CONFIG_SYN_COOKIES 5785 u32 cookie; 5786 u16 mss; 5787 5788 if (unlikely(th_len < sizeof(*th) || th_len != th->doff * 4)) 5789 return -EINVAL; 5790 5791 if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN) 5792 return -EINVAL; 5793 5794 if (!sock_net(sk)->ipv4.sysctl_tcp_syncookies) 5795 return -ENOENT; 5796 5797 if (!th->syn || th->ack || th->fin || th->rst) 5798 return -EINVAL; 5799 5800 if (unlikely(iph_len < sizeof(struct iphdr))) 5801 return -EINVAL; 5802 5803 /* Both struct iphdr and struct ipv6hdr have the version field at the 5804 * same offset so we can cast to the shorter header (struct iphdr). 5805 */ 5806 switch (((struct iphdr *)iph)->version) { 5807 case 4: 5808 if (sk->sk_family == AF_INET6 && sk->sk_ipv6only) 5809 return -EINVAL; 5810 5811 mss = tcp_v4_get_syncookie(sk, iph, th, &cookie); 5812 break; 5813 5814 #if IS_BUILTIN(CONFIG_IPV6) 5815 case 6: 5816 if (unlikely(iph_len < sizeof(struct ipv6hdr))) 5817 return -EINVAL; 5818 5819 if (sk->sk_family != AF_INET6) 5820 return -EINVAL; 5821 5822 mss = tcp_v6_get_syncookie(sk, iph, th, &cookie); 5823 break; 5824 #endif /* CONFIG_IPV6 */ 5825 5826 default: 5827 return -EPROTONOSUPPORT; 5828 } 5829 if (mss == 0) 5830 return -ENOENT; 5831 5832 return cookie | ((u64)mss << 32); 5833 #else 5834 return -EOPNOTSUPP; 5835 #endif /* CONFIG_SYN_COOKIES */ 5836 } 5837 5838 static const struct bpf_func_proto bpf_tcp_gen_syncookie_proto = { 5839 .func = bpf_tcp_gen_syncookie, 5840 .gpl_only = true, /* __cookie_v*_init_sequence() is GPL */ 5841 .pkt_access = true, 5842 .ret_type = RET_INTEGER, 5843 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 5844 .arg2_type = ARG_PTR_TO_MEM, 5845 .arg3_type = ARG_CONST_SIZE, 5846 .arg4_type = ARG_PTR_TO_MEM, 5847 .arg5_type = ARG_CONST_SIZE, 5848 }; 5849 5850 #endif /* CONFIG_INET */ 5851 5852 bool bpf_helper_changes_pkt_data(void *func) 5853 { 5854 if (func == bpf_skb_vlan_push || 5855 func == bpf_skb_vlan_pop || 5856 func == bpf_skb_store_bytes || 5857 func == bpf_skb_change_proto || 5858 func == bpf_skb_change_head || 5859 func == sk_skb_change_head || 5860 func == bpf_skb_change_tail || 5861 func == sk_skb_change_tail || 5862 func == bpf_skb_adjust_room || 5863 func == bpf_skb_pull_data || 5864 func == sk_skb_pull_data || 5865 func == bpf_clone_redirect || 5866 func == bpf_l3_csum_replace || 5867 func == bpf_l4_csum_replace || 5868 func == bpf_xdp_adjust_head || 5869 func == bpf_xdp_adjust_meta || 5870 func == bpf_msg_pull_data || 5871 func == bpf_msg_push_data || 5872 func == bpf_msg_pop_data || 5873 func == bpf_xdp_adjust_tail || 5874 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 5875 func == bpf_lwt_seg6_store_bytes || 5876 func == bpf_lwt_seg6_adjust_srh || 5877 func == bpf_lwt_seg6_action || 5878 #endif 5879 func == bpf_lwt_in_push_encap || 5880 func == bpf_lwt_xmit_push_encap) 5881 return true; 5882 5883 return false; 5884 } 5885 5886 const struct bpf_func_proto * 5887 bpf_base_func_proto(enum bpf_func_id func_id) 5888 { 5889 switch (func_id) { 5890 case BPF_FUNC_map_lookup_elem: 5891 return &bpf_map_lookup_elem_proto; 5892 case BPF_FUNC_map_update_elem: 5893 return &bpf_map_update_elem_proto; 5894 case BPF_FUNC_map_delete_elem: 5895 return &bpf_map_delete_elem_proto; 5896 case BPF_FUNC_map_push_elem: 5897 return &bpf_map_push_elem_proto; 5898 case BPF_FUNC_map_pop_elem: 5899 return &bpf_map_pop_elem_proto; 5900 case BPF_FUNC_map_peek_elem: 5901 return &bpf_map_peek_elem_proto; 5902 case BPF_FUNC_get_prandom_u32: 5903 return &bpf_get_prandom_u32_proto; 5904 case BPF_FUNC_get_smp_processor_id: 5905 return &bpf_get_raw_smp_processor_id_proto; 5906 case BPF_FUNC_get_numa_node_id: 5907 return &bpf_get_numa_node_id_proto; 5908 case BPF_FUNC_tail_call: 5909 return &bpf_tail_call_proto; 5910 case BPF_FUNC_ktime_get_ns: 5911 return &bpf_ktime_get_ns_proto; 5912 default: 5913 break; 5914 } 5915 5916 if (!capable(CAP_SYS_ADMIN)) 5917 return NULL; 5918 5919 switch (func_id) { 5920 case BPF_FUNC_spin_lock: 5921 return &bpf_spin_lock_proto; 5922 case BPF_FUNC_spin_unlock: 5923 return &bpf_spin_unlock_proto; 5924 case BPF_FUNC_trace_printk: 5925 return bpf_get_trace_printk_proto(); 5926 case BPF_FUNC_jiffies64: 5927 return &bpf_jiffies64_proto; 5928 default: 5929 return NULL; 5930 } 5931 } 5932 5933 static const struct bpf_func_proto * 5934 sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 5935 { 5936 switch (func_id) { 5937 /* inet and inet6 sockets are created in a process 5938 * context so there is always a valid uid/gid 5939 */ 5940 case BPF_FUNC_get_current_uid_gid: 5941 return &bpf_get_current_uid_gid_proto; 5942 case BPF_FUNC_get_local_storage: 5943 return &bpf_get_local_storage_proto; 5944 default: 5945 return bpf_base_func_proto(func_id); 5946 } 5947 } 5948 5949 static const struct bpf_func_proto * 5950 sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 5951 { 5952 switch (func_id) { 5953 /* inet and inet6 sockets are created in a process 5954 * context so there is always a valid uid/gid 5955 */ 5956 case BPF_FUNC_get_current_uid_gid: 5957 return &bpf_get_current_uid_gid_proto; 5958 case BPF_FUNC_bind: 5959 switch (prog->expected_attach_type) { 5960 case BPF_CGROUP_INET4_CONNECT: 5961 case BPF_CGROUP_INET6_CONNECT: 5962 return &bpf_bind_proto; 5963 default: 5964 return NULL; 5965 } 5966 case BPF_FUNC_get_socket_cookie: 5967 return &bpf_get_socket_cookie_sock_addr_proto; 5968 case BPF_FUNC_get_local_storage: 5969 return &bpf_get_local_storage_proto; 5970 #ifdef CONFIG_INET 5971 case BPF_FUNC_sk_lookup_tcp: 5972 return &bpf_sock_addr_sk_lookup_tcp_proto; 5973 case BPF_FUNC_sk_lookup_udp: 5974 return &bpf_sock_addr_sk_lookup_udp_proto; 5975 case BPF_FUNC_sk_release: 5976 return &bpf_sk_release_proto; 5977 case BPF_FUNC_skc_lookup_tcp: 5978 return &bpf_sock_addr_skc_lookup_tcp_proto; 5979 #endif /* CONFIG_INET */ 5980 case BPF_FUNC_sk_storage_get: 5981 return &bpf_sk_storage_get_proto; 5982 case BPF_FUNC_sk_storage_delete: 5983 return &bpf_sk_storage_delete_proto; 5984 default: 5985 return bpf_base_func_proto(func_id); 5986 } 5987 } 5988 5989 static const struct bpf_func_proto * 5990 sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 5991 { 5992 switch (func_id) { 5993 case BPF_FUNC_skb_load_bytes: 5994 return &bpf_skb_load_bytes_proto; 5995 case BPF_FUNC_skb_load_bytes_relative: 5996 return &bpf_skb_load_bytes_relative_proto; 5997 case BPF_FUNC_get_socket_cookie: 5998 return &bpf_get_socket_cookie_proto; 5999 case BPF_FUNC_get_socket_uid: 6000 return &bpf_get_socket_uid_proto; 6001 case BPF_FUNC_perf_event_output: 6002 return &bpf_skb_event_output_proto; 6003 default: 6004 return bpf_base_func_proto(func_id); 6005 } 6006 } 6007 6008 const struct bpf_func_proto bpf_sk_storage_get_proto __weak; 6009 const struct bpf_func_proto bpf_sk_storage_delete_proto __weak; 6010 6011 static const struct bpf_func_proto * 6012 cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6013 { 6014 switch (func_id) { 6015 case BPF_FUNC_get_local_storage: 6016 return &bpf_get_local_storage_proto; 6017 case BPF_FUNC_sk_fullsock: 6018 return &bpf_sk_fullsock_proto; 6019 case BPF_FUNC_sk_storage_get: 6020 return &bpf_sk_storage_get_proto; 6021 case BPF_FUNC_sk_storage_delete: 6022 return &bpf_sk_storage_delete_proto; 6023 case BPF_FUNC_perf_event_output: 6024 return &bpf_skb_event_output_proto; 6025 #ifdef CONFIG_SOCK_CGROUP_DATA 6026 case BPF_FUNC_skb_cgroup_id: 6027 return &bpf_skb_cgroup_id_proto; 6028 #endif 6029 #ifdef CONFIG_INET 6030 case BPF_FUNC_tcp_sock: 6031 return &bpf_tcp_sock_proto; 6032 case BPF_FUNC_get_listener_sock: 6033 return &bpf_get_listener_sock_proto; 6034 case BPF_FUNC_skb_ecn_set_ce: 6035 return &bpf_skb_ecn_set_ce_proto; 6036 #endif 6037 default: 6038 return sk_filter_func_proto(func_id, prog); 6039 } 6040 } 6041 6042 static const struct bpf_func_proto * 6043 tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6044 { 6045 switch (func_id) { 6046 case BPF_FUNC_skb_store_bytes: 6047 return &bpf_skb_store_bytes_proto; 6048 case BPF_FUNC_skb_load_bytes: 6049 return &bpf_skb_load_bytes_proto; 6050 case BPF_FUNC_skb_load_bytes_relative: 6051 return &bpf_skb_load_bytes_relative_proto; 6052 case BPF_FUNC_skb_pull_data: 6053 return &bpf_skb_pull_data_proto; 6054 case BPF_FUNC_csum_diff: 6055 return &bpf_csum_diff_proto; 6056 case BPF_FUNC_csum_update: 6057 return &bpf_csum_update_proto; 6058 case BPF_FUNC_l3_csum_replace: 6059 return &bpf_l3_csum_replace_proto; 6060 case BPF_FUNC_l4_csum_replace: 6061 return &bpf_l4_csum_replace_proto; 6062 case BPF_FUNC_clone_redirect: 6063 return &bpf_clone_redirect_proto; 6064 case BPF_FUNC_get_cgroup_classid: 6065 return &bpf_get_cgroup_classid_proto; 6066 case BPF_FUNC_skb_vlan_push: 6067 return &bpf_skb_vlan_push_proto; 6068 case BPF_FUNC_skb_vlan_pop: 6069 return &bpf_skb_vlan_pop_proto; 6070 case BPF_FUNC_skb_change_proto: 6071 return &bpf_skb_change_proto_proto; 6072 case BPF_FUNC_skb_change_type: 6073 return &bpf_skb_change_type_proto; 6074 case BPF_FUNC_skb_adjust_room: 6075 return &bpf_skb_adjust_room_proto; 6076 case BPF_FUNC_skb_change_tail: 6077 return &bpf_skb_change_tail_proto; 6078 case BPF_FUNC_skb_get_tunnel_key: 6079 return &bpf_skb_get_tunnel_key_proto; 6080 case BPF_FUNC_skb_set_tunnel_key: 6081 return bpf_get_skb_set_tunnel_proto(func_id); 6082 case BPF_FUNC_skb_get_tunnel_opt: 6083 return &bpf_skb_get_tunnel_opt_proto; 6084 case BPF_FUNC_skb_set_tunnel_opt: 6085 return bpf_get_skb_set_tunnel_proto(func_id); 6086 case BPF_FUNC_redirect: 6087 return &bpf_redirect_proto; 6088 case BPF_FUNC_get_route_realm: 6089 return &bpf_get_route_realm_proto; 6090 case BPF_FUNC_get_hash_recalc: 6091 return &bpf_get_hash_recalc_proto; 6092 case BPF_FUNC_set_hash_invalid: 6093 return &bpf_set_hash_invalid_proto; 6094 case BPF_FUNC_set_hash: 6095 return &bpf_set_hash_proto; 6096 case BPF_FUNC_perf_event_output: 6097 return &bpf_skb_event_output_proto; 6098 case BPF_FUNC_get_smp_processor_id: 6099 return &bpf_get_smp_processor_id_proto; 6100 case BPF_FUNC_skb_under_cgroup: 6101 return &bpf_skb_under_cgroup_proto; 6102 case BPF_FUNC_get_socket_cookie: 6103 return &bpf_get_socket_cookie_proto; 6104 case BPF_FUNC_get_socket_uid: 6105 return &bpf_get_socket_uid_proto; 6106 case BPF_FUNC_fib_lookup: 6107 return &bpf_skb_fib_lookup_proto; 6108 case BPF_FUNC_sk_fullsock: 6109 return &bpf_sk_fullsock_proto; 6110 case BPF_FUNC_sk_storage_get: 6111 return &bpf_sk_storage_get_proto; 6112 case BPF_FUNC_sk_storage_delete: 6113 return &bpf_sk_storage_delete_proto; 6114 #ifdef CONFIG_XFRM 6115 case BPF_FUNC_skb_get_xfrm_state: 6116 return &bpf_skb_get_xfrm_state_proto; 6117 #endif 6118 #ifdef CONFIG_SOCK_CGROUP_DATA 6119 case BPF_FUNC_skb_cgroup_id: 6120 return &bpf_skb_cgroup_id_proto; 6121 case BPF_FUNC_skb_ancestor_cgroup_id: 6122 return &bpf_skb_ancestor_cgroup_id_proto; 6123 #endif 6124 #ifdef CONFIG_INET 6125 case BPF_FUNC_sk_lookup_tcp: 6126 return &bpf_sk_lookup_tcp_proto; 6127 case BPF_FUNC_sk_lookup_udp: 6128 return &bpf_sk_lookup_udp_proto; 6129 case BPF_FUNC_sk_release: 6130 return &bpf_sk_release_proto; 6131 case BPF_FUNC_tcp_sock: 6132 return &bpf_tcp_sock_proto; 6133 case BPF_FUNC_get_listener_sock: 6134 return &bpf_get_listener_sock_proto; 6135 case BPF_FUNC_skc_lookup_tcp: 6136 return &bpf_skc_lookup_tcp_proto; 6137 case BPF_FUNC_tcp_check_syncookie: 6138 return &bpf_tcp_check_syncookie_proto; 6139 case BPF_FUNC_skb_ecn_set_ce: 6140 return &bpf_skb_ecn_set_ce_proto; 6141 case BPF_FUNC_tcp_gen_syncookie: 6142 return &bpf_tcp_gen_syncookie_proto; 6143 #endif 6144 default: 6145 return bpf_base_func_proto(func_id); 6146 } 6147 } 6148 6149 static const struct bpf_func_proto * 6150 xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6151 { 6152 switch (func_id) { 6153 case BPF_FUNC_perf_event_output: 6154 return &bpf_xdp_event_output_proto; 6155 case BPF_FUNC_get_smp_processor_id: 6156 return &bpf_get_smp_processor_id_proto; 6157 case BPF_FUNC_csum_diff: 6158 return &bpf_csum_diff_proto; 6159 case BPF_FUNC_xdp_adjust_head: 6160 return &bpf_xdp_adjust_head_proto; 6161 case BPF_FUNC_xdp_adjust_meta: 6162 return &bpf_xdp_adjust_meta_proto; 6163 case BPF_FUNC_redirect: 6164 return &bpf_xdp_redirect_proto; 6165 case BPF_FUNC_redirect_map: 6166 return &bpf_xdp_redirect_map_proto; 6167 case BPF_FUNC_xdp_adjust_tail: 6168 return &bpf_xdp_adjust_tail_proto; 6169 case BPF_FUNC_fib_lookup: 6170 return &bpf_xdp_fib_lookup_proto; 6171 #ifdef CONFIG_INET 6172 case BPF_FUNC_sk_lookup_udp: 6173 return &bpf_xdp_sk_lookup_udp_proto; 6174 case BPF_FUNC_sk_lookup_tcp: 6175 return &bpf_xdp_sk_lookup_tcp_proto; 6176 case BPF_FUNC_sk_release: 6177 return &bpf_sk_release_proto; 6178 case BPF_FUNC_skc_lookup_tcp: 6179 return &bpf_xdp_skc_lookup_tcp_proto; 6180 case BPF_FUNC_tcp_check_syncookie: 6181 return &bpf_tcp_check_syncookie_proto; 6182 case BPF_FUNC_tcp_gen_syncookie: 6183 return &bpf_tcp_gen_syncookie_proto; 6184 #endif 6185 default: 6186 return bpf_base_func_proto(func_id); 6187 } 6188 } 6189 6190 const struct bpf_func_proto bpf_sock_map_update_proto __weak; 6191 const struct bpf_func_proto bpf_sock_hash_update_proto __weak; 6192 6193 static const struct bpf_func_proto * 6194 sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6195 { 6196 switch (func_id) { 6197 case BPF_FUNC_setsockopt: 6198 return &bpf_setsockopt_proto; 6199 case BPF_FUNC_getsockopt: 6200 return &bpf_getsockopt_proto; 6201 case BPF_FUNC_sock_ops_cb_flags_set: 6202 return &bpf_sock_ops_cb_flags_set_proto; 6203 case BPF_FUNC_sock_map_update: 6204 return &bpf_sock_map_update_proto; 6205 case BPF_FUNC_sock_hash_update: 6206 return &bpf_sock_hash_update_proto; 6207 case BPF_FUNC_get_socket_cookie: 6208 return &bpf_get_socket_cookie_sock_ops_proto; 6209 case BPF_FUNC_get_local_storage: 6210 return &bpf_get_local_storage_proto; 6211 case BPF_FUNC_perf_event_output: 6212 return &bpf_sockopt_event_output_proto; 6213 case BPF_FUNC_sk_storage_get: 6214 return &bpf_sk_storage_get_proto; 6215 case BPF_FUNC_sk_storage_delete: 6216 return &bpf_sk_storage_delete_proto; 6217 #ifdef CONFIG_INET 6218 case BPF_FUNC_tcp_sock: 6219 return &bpf_tcp_sock_proto; 6220 #endif /* CONFIG_INET */ 6221 default: 6222 return bpf_base_func_proto(func_id); 6223 } 6224 } 6225 6226 const struct bpf_func_proto bpf_msg_redirect_map_proto __weak; 6227 const struct bpf_func_proto bpf_msg_redirect_hash_proto __weak; 6228 6229 static const struct bpf_func_proto * 6230 sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6231 { 6232 switch (func_id) { 6233 case BPF_FUNC_msg_redirect_map: 6234 return &bpf_msg_redirect_map_proto; 6235 case BPF_FUNC_msg_redirect_hash: 6236 return &bpf_msg_redirect_hash_proto; 6237 case BPF_FUNC_msg_apply_bytes: 6238 return &bpf_msg_apply_bytes_proto; 6239 case BPF_FUNC_msg_cork_bytes: 6240 return &bpf_msg_cork_bytes_proto; 6241 case BPF_FUNC_msg_pull_data: 6242 return &bpf_msg_pull_data_proto; 6243 case BPF_FUNC_msg_push_data: 6244 return &bpf_msg_push_data_proto; 6245 case BPF_FUNC_msg_pop_data: 6246 return &bpf_msg_pop_data_proto; 6247 default: 6248 return bpf_base_func_proto(func_id); 6249 } 6250 } 6251 6252 const struct bpf_func_proto bpf_sk_redirect_map_proto __weak; 6253 const struct bpf_func_proto bpf_sk_redirect_hash_proto __weak; 6254 6255 static const struct bpf_func_proto * 6256 sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6257 { 6258 switch (func_id) { 6259 case BPF_FUNC_skb_store_bytes: 6260 return &bpf_skb_store_bytes_proto; 6261 case BPF_FUNC_skb_load_bytes: 6262 return &bpf_skb_load_bytes_proto; 6263 case BPF_FUNC_skb_pull_data: 6264 return &sk_skb_pull_data_proto; 6265 case BPF_FUNC_skb_change_tail: 6266 return &sk_skb_change_tail_proto; 6267 case BPF_FUNC_skb_change_head: 6268 return &sk_skb_change_head_proto; 6269 case BPF_FUNC_get_socket_cookie: 6270 return &bpf_get_socket_cookie_proto; 6271 case BPF_FUNC_get_socket_uid: 6272 return &bpf_get_socket_uid_proto; 6273 case BPF_FUNC_sk_redirect_map: 6274 return &bpf_sk_redirect_map_proto; 6275 case BPF_FUNC_sk_redirect_hash: 6276 return &bpf_sk_redirect_hash_proto; 6277 case BPF_FUNC_perf_event_output: 6278 return &bpf_skb_event_output_proto; 6279 #ifdef CONFIG_INET 6280 case BPF_FUNC_sk_lookup_tcp: 6281 return &bpf_sk_lookup_tcp_proto; 6282 case BPF_FUNC_sk_lookup_udp: 6283 return &bpf_sk_lookup_udp_proto; 6284 case BPF_FUNC_sk_release: 6285 return &bpf_sk_release_proto; 6286 case BPF_FUNC_skc_lookup_tcp: 6287 return &bpf_skc_lookup_tcp_proto; 6288 #endif 6289 default: 6290 return bpf_base_func_proto(func_id); 6291 } 6292 } 6293 6294 static const struct bpf_func_proto * 6295 flow_dissector_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6296 { 6297 switch (func_id) { 6298 case BPF_FUNC_skb_load_bytes: 6299 return &bpf_flow_dissector_load_bytes_proto; 6300 default: 6301 return bpf_base_func_proto(func_id); 6302 } 6303 } 6304 6305 static const struct bpf_func_proto * 6306 lwt_out_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6307 { 6308 switch (func_id) { 6309 case BPF_FUNC_skb_load_bytes: 6310 return &bpf_skb_load_bytes_proto; 6311 case BPF_FUNC_skb_pull_data: 6312 return &bpf_skb_pull_data_proto; 6313 case BPF_FUNC_csum_diff: 6314 return &bpf_csum_diff_proto; 6315 case BPF_FUNC_get_cgroup_classid: 6316 return &bpf_get_cgroup_classid_proto; 6317 case BPF_FUNC_get_route_realm: 6318 return &bpf_get_route_realm_proto; 6319 case BPF_FUNC_get_hash_recalc: 6320 return &bpf_get_hash_recalc_proto; 6321 case BPF_FUNC_perf_event_output: 6322 return &bpf_skb_event_output_proto; 6323 case BPF_FUNC_get_smp_processor_id: 6324 return &bpf_get_smp_processor_id_proto; 6325 case BPF_FUNC_skb_under_cgroup: 6326 return &bpf_skb_under_cgroup_proto; 6327 default: 6328 return bpf_base_func_proto(func_id); 6329 } 6330 } 6331 6332 static const struct bpf_func_proto * 6333 lwt_in_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6334 { 6335 switch (func_id) { 6336 case BPF_FUNC_lwt_push_encap: 6337 return &bpf_lwt_in_push_encap_proto; 6338 default: 6339 return lwt_out_func_proto(func_id, prog); 6340 } 6341 } 6342 6343 static const struct bpf_func_proto * 6344 lwt_xmit_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6345 { 6346 switch (func_id) { 6347 case BPF_FUNC_skb_get_tunnel_key: 6348 return &bpf_skb_get_tunnel_key_proto; 6349 case BPF_FUNC_skb_set_tunnel_key: 6350 return bpf_get_skb_set_tunnel_proto(func_id); 6351 case BPF_FUNC_skb_get_tunnel_opt: 6352 return &bpf_skb_get_tunnel_opt_proto; 6353 case BPF_FUNC_skb_set_tunnel_opt: 6354 return bpf_get_skb_set_tunnel_proto(func_id); 6355 case BPF_FUNC_redirect: 6356 return &bpf_redirect_proto; 6357 case BPF_FUNC_clone_redirect: 6358 return &bpf_clone_redirect_proto; 6359 case BPF_FUNC_skb_change_tail: 6360 return &bpf_skb_change_tail_proto; 6361 case BPF_FUNC_skb_change_head: 6362 return &bpf_skb_change_head_proto; 6363 case BPF_FUNC_skb_store_bytes: 6364 return &bpf_skb_store_bytes_proto; 6365 case BPF_FUNC_csum_update: 6366 return &bpf_csum_update_proto; 6367 case BPF_FUNC_l3_csum_replace: 6368 return &bpf_l3_csum_replace_proto; 6369 case BPF_FUNC_l4_csum_replace: 6370 return &bpf_l4_csum_replace_proto; 6371 case BPF_FUNC_set_hash_invalid: 6372 return &bpf_set_hash_invalid_proto; 6373 case BPF_FUNC_lwt_push_encap: 6374 return &bpf_lwt_xmit_push_encap_proto; 6375 default: 6376 return lwt_out_func_proto(func_id, prog); 6377 } 6378 } 6379 6380 static const struct bpf_func_proto * 6381 lwt_seg6local_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6382 { 6383 switch (func_id) { 6384 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 6385 case BPF_FUNC_lwt_seg6_store_bytes: 6386 return &bpf_lwt_seg6_store_bytes_proto; 6387 case BPF_FUNC_lwt_seg6_action: 6388 return &bpf_lwt_seg6_action_proto; 6389 case BPF_FUNC_lwt_seg6_adjust_srh: 6390 return &bpf_lwt_seg6_adjust_srh_proto; 6391 #endif 6392 default: 6393 return lwt_out_func_proto(func_id, prog); 6394 } 6395 } 6396 6397 static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type, 6398 const struct bpf_prog *prog, 6399 struct bpf_insn_access_aux *info) 6400 { 6401 const int size_default = sizeof(__u32); 6402 6403 if (off < 0 || off >= sizeof(struct __sk_buff)) 6404 return false; 6405 6406 /* The verifier guarantees that size > 0. */ 6407 if (off % size != 0) 6408 return false; 6409 6410 switch (off) { 6411 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 6412 if (off + size > offsetofend(struct __sk_buff, cb[4])) 6413 return false; 6414 break; 6415 case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]): 6416 case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]): 6417 case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4): 6418 case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4): 6419 case bpf_ctx_range(struct __sk_buff, data): 6420 case bpf_ctx_range(struct __sk_buff, data_meta): 6421 case bpf_ctx_range(struct __sk_buff, data_end): 6422 if (size != size_default) 6423 return false; 6424 break; 6425 case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): 6426 return false; 6427 case bpf_ctx_range(struct __sk_buff, tstamp): 6428 if (size != sizeof(__u64)) 6429 return false; 6430 break; 6431 case offsetof(struct __sk_buff, sk): 6432 if (type == BPF_WRITE || size != sizeof(__u64)) 6433 return false; 6434 info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL; 6435 break; 6436 default: 6437 /* Only narrow read access allowed for now. */ 6438 if (type == BPF_WRITE) { 6439 if (size != size_default) 6440 return false; 6441 } else { 6442 bpf_ctx_record_field_size(info, size_default); 6443 if (!bpf_ctx_narrow_access_ok(off, size, size_default)) 6444 return false; 6445 } 6446 } 6447 6448 return true; 6449 } 6450 6451 static bool sk_filter_is_valid_access(int off, int size, 6452 enum bpf_access_type type, 6453 const struct bpf_prog *prog, 6454 struct bpf_insn_access_aux *info) 6455 { 6456 switch (off) { 6457 case bpf_ctx_range(struct __sk_buff, tc_classid): 6458 case bpf_ctx_range(struct __sk_buff, data): 6459 case bpf_ctx_range(struct __sk_buff, data_meta): 6460 case bpf_ctx_range(struct __sk_buff, data_end): 6461 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 6462 case bpf_ctx_range(struct __sk_buff, tstamp): 6463 case bpf_ctx_range(struct __sk_buff, wire_len): 6464 return false; 6465 } 6466 6467 if (type == BPF_WRITE) { 6468 switch (off) { 6469 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 6470 break; 6471 default: 6472 return false; 6473 } 6474 } 6475 6476 return bpf_skb_is_valid_access(off, size, type, prog, info); 6477 } 6478 6479 static bool cg_skb_is_valid_access(int off, int size, 6480 enum bpf_access_type type, 6481 const struct bpf_prog *prog, 6482 struct bpf_insn_access_aux *info) 6483 { 6484 switch (off) { 6485 case bpf_ctx_range(struct __sk_buff, tc_classid): 6486 case bpf_ctx_range(struct __sk_buff, data_meta): 6487 case bpf_ctx_range(struct __sk_buff, wire_len): 6488 return false; 6489 case bpf_ctx_range(struct __sk_buff, data): 6490 case bpf_ctx_range(struct __sk_buff, data_end): 6491 if (!capable(CAP_SYS_ADMIN)) 6492 return false; 6493 break; 6494 } 6495 6496 if (type == BPF_WRITE) { 6497 switch (off) { 6498 case bpf_ctx_range(struct __sk_buff, mark): 6499 case bpf_ctx_range(struct __sk_buff, priority): 6500 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 6501 break; 6502 case bpf_ctx_range(struct __sk_buff, tstamp): 6503 if (!capable(CAP_SYS_ADMIN)) 6504 return false; 6505 break; 6506 default: 6507 return false; 6508 } 6509 } 6510 6511 switch (off) { 6512 case bpf_ctx_range(struct __sk_buff, data): 6513 info->reg_type = PTR_TO_PACKET; 6514 break; 6515 case bpf_ctx_range(struct __sk_buff, data_end): 6516 info->reg_type = PTR_TO_PACKET_END; 6517 break; 6518 } 6519 6520 return bpf_skb_is_valid_access(off, size, type, prog, info); 6521 } 6522 6523 static bool lwt_is_valid_access(int off, int size, 6524 enum bpf_access_type type, 6525 const struct bpf_prog *prog, 6526 struct bpf_insn_access_aux *info) 6527 { 6528 switch (off) { 6529 case bpf_ctx_range(struct __sk_buff, tc_classid): 6530 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 6531 case bpf_ctx_range(struct __sk_buff, data_meta): 6532 case bpf_ctx_range(struct __sk_buff, tstamp): 6533 case bpf_ctx_range(struct __sk_buff, wire_len): 6534 return false; 6535 } 6536 6537 if (type == BPF_WRITE) { 6538 switch (off) { 6539 case bpf_ctx_range(struct __sk_buff, mark): 6540 case bpf_ctx_range(struct __sk_buff, priority): 6541 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 6542 break; 6543 default: 6544 return false; 6545 } 6546 } 6547 6548 switch (off) { 6549 case bpf_ctx_range(struct __sk_buff, data): 6550 info->reg_type = PTR_TO_PACKET; 6551 break; 6552 case bpf_ctx_range(struct __sk_buff, data_end): 6553 info->reg_type = PTR_TO_PACKET_END; 6554 break; 6555 } 6556 6557 return bpf_skb_is_valid_access(off, size, type, prog, info); 6558 } 6559 6560 /* Attach type specific accesses */ 6561 static bool __sock_filter_check_attach_type(int off, 6562 enum bpf_access_type access_type, 6563 enum bpf_attach_type attach_type) 6564 { 6565 switch (off) { 6566 case offsetof(struct bpf_sock, bound_dev_if): 6567 case offsetof(struct bpf_sock, mark): 6568 case offsetof(struct bpf_sock, priority): 6569 switch (attach_type) { 6570 case BPF_CGROUP_INET_SOCK_CREATE: 6571 goto full_access; 6572 default: 6573 return false; 6574 } 6575 case bpf_ctx_range(struct bpf_sock, src_ip4): 6576 switch (attach_type) { 6577 case BPF_CGROUP_INET4_POST_BIND: 6578 goto read_only; 6579 default: 6580 return false; 6581 } 6582 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 6583 switch (attach_type) { 6584 case BPF_CGROUP_INET6_POST_BIND: 6585 goto read_only; 6586 default: 6587 return false; 6588 } 6589 case bpf_ctx_range(struct bpf_sock, src_port): 6590 switch (attach_type) { 6591 case BPF_CGROUP_INET4_POST_BIND: 6592 case BPF_CGROUP_INET6_POST_BIND: 6593 goto read_only; 6594 default: 6595 return false; 6596 } 6597 } 6598 read_only: 6599 return access_type == BPF_READ; 6600 full_access: 6601 return true; 6602 } 6603 6604 bool bpf_sock_common_is_valid_access(int off, int size, 6605 enum bpf_access_type type, 6606 struct bpf_insn_access_aux *info) 6607 { 6608 switch (off) { 6609 case bpf_ctx_range_till(struct bpf_sock, type, priority): 6610 return false; 6611 default: 6612 return bpf_sock_is_valid_access(off, size, type, info); 6613 } 6614 } 6615 6616 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, 6617 struct bpf_insn_access_aux *info) 6618 { 6619 const int size_default = sizeof(__u32); 6620 6621 if (off < 0 || off >= sizeof(struct bpf_sock)) 6622 return false; 6623 if (off % size != 0) 6624 return false; 6625 6626 switch (off) { 6627 case offsetof(struct bpf_sock, state): 6628 case offsetof(struct bpf_sock, family): 6629 case offsetof(struct bpf_sock, type): 6630 case offsetof(struct bpf_sock, protocol): 6631 case offsetof(struct bpf_sock, dst_port): 6632 case offsetof(struct bpf_sock, src_port): 6633 case bpf_ctx_range(struct bpf_sock, src_ip4): 6634 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 6635 case bpf_ctx_range(struct bpf_sock, dst_ip4): 6636 case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): 6637 bpf_ctx_record_field_size(info, size_default); 6638 return bpf_ctx_narrow_access_ok(off, size, size_default); 6639 } 6640 6641 return size == size_default; 6642 } 6643 6644 static bool sock_filter_is_valid_access(int off, int size, 6645 enum bpf_access_type type, 6646 const struct bpf_prog *prog, 6647 struct bpf_insn_access_aux *info) 6648 { 6649 if (!bpf_sock_is_valid_access(off, size, type, info)) 6650 return false; 6651 return __sock_filter_check_attach_type(off, type, 6652 prog->expected_attach_type); 6653 } 6654 6655 static int bpf_noop_prologue(struct bpf_insn *insn_buf, bool direct_write, 6656 const struct bpf_prog *prog) 6657 { 6658 /* Neither direct read nor direct write requires any preliminary 6659 * action. 6660 */ 6661 return 0; 6662 } 6663 6664 static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write, 6665 const struct bpf_prog *prog, int drop_verdict) 6666 { 6667 struct bpf_insn *insn = insn_buf; 6668 6669 if (!direct_write) 6670 return 0; 6671 6672 /* if (!skb->cloned) 6673 * goto start; 6674 * 6675 * (Fast-path, otherwise approximation that we might be 6676 * a clone, do the rest in helper.) 6677 */ 6678 *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET()); 6679 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK); 6680 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7); 6681 6682 /* ret = bpf_skb_pull_data(skb, 0); */ 6683 *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1); 6684 *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2); 6685 *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, 6686 BPF_FUNC_skb_pull_data); 6687 /* if (!ret) 6688 * goto restore; 6689 * return TC_ACT_SHOT; 6690 */ 6691 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2); 6692 *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict); 6693 *insn++ = BPF_EXIT_INSN(); 6694 6695 /* restore: */ 6696 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6); 6697 /* start: */ 6698 *insn++ = prog->insnsi[0]; 6699 6700 return insn - insn_buf; 6701 } 6702 6703 static int bpf_gen_ld_abs(const struct bpf_insn *orig, 6704 struct bpf_insn *insn_buf) 6705 { 6706 bool indirect = BPF_MODE(orig->code) == BPF_IND; 6707 struct bpf_insn *insn = insn_buf; 6708 6709 /* We're guaranteed here that CTX is in R6. */ 6710 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX); 6711 if (!indirect) { 6712 *insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm); 6713 } else { 6714 *insn++ = BPF_MOV64_REG(BPF_REG_2, orig->src_reg); 6715 if (orig->imm) 6716 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm); 6717 } 6718 6719 switch (BPF_SIZE(orig->code)) { 6720 case BPF_B: 6721 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache); 6722 break; 6723 case BPF_H: 6724 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache); 6725 break; 6726 case BPF_W: 6727 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache); 6728 break; 6729 } 6730 6731 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 2); 6732 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0); 6733 *insn++ = BPF_EXIT_INSN(); 6734 6735 return insn - insn_buf; 6736 } 6737 6738 static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write, 6739 const struct bpf_prog *prog) 6740 { 6741 return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT); 6742 } 6743 6744 static bool tc_cls_act_is_valid_access(int off, int size, 6745 enum bpf_access_type type, 6746 const struct bpf_prog *prog, 6747 struct bpf_insn_access_aux *info) 6748 { 6749 if (type == BPF_WRITE) { 6750 switch (off) { 6751 case bpf_ctx_range(struct __sk_buff, mark): 6752 case bpf_ctx_range(struct __sk_buff, tc_index): 6753 case bpf_ctx_range(struct __sk_buff, priority): 6754 case bpf_ctx_range(struct __sk_buff, tc_classid): 6755 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 6756 case bpf_ctx_range(struct __sk_buff, tstamp): 6757 case bpf_ctx_range(struct __sk_buff, queue_mapping): 6758 break; 6759 default: 6760 return false; 6761 } 6762 } 6763 6764 switch (off) { 6765 case bpf_ctx_range(struct __sk_buff, data): 6766 info->reg_type = PTR_TO_PACKET; 6767 break; 6768 case bpf_ctx_range(struct __sk_buff, data_meta): 6769 info->reg_type = PTR_TO_PACKET_META; 6770 break; 6771 case bpf_ctx_range(struct __sk_buff, data_end): 6772 info->reg_type = PTR_TO_PACKET_END; 6773 break; 6774 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 6775 return false; 6776 } 6777 6778 return bpf_skb_is_valid_access(off, size, type, prog, info); 6779 } 6780 6781 static bool __is_valid_xdp_access(int off, int size) 6782 { 6783 if (off < 0 || off >= sizeof(struct xdp_md)) 6784 return false; 6785 if (off % size != 0) 6786 return false; 6787 if (size != sizeof(__u32)) 6788 return false; 6789 6790 return true; 6791 } 6792 6793 static bool xdp_is_valid_access(int off, int size, 6794 enum bpf_access_type type, 6795 const struct bpf_prog *prog, 6796 struct bpf_insn_access_aux *info) 6797 { 6798 if (type == BPF_WRITE) { 6799 if (bpf_prog_is_dev_bound(prog->aux)) { 6800 switch (off) { 6801 case offsetof(struct xdp_md, rx_queue_index): 6802 return __is_valid_xdp_access(off, size); 6803 } 6804 } 6805 return false; 6806 } 6807 6808 switch (off) { 6809 case offsetof(struct xdp_md, data): 6810 info->reg_type = PTR_TO_PACKET; 6811 break; 6812 case offsetof(struct xdp_md, data_meta): 6813 info->reg_type = PTR_TO_PACKET_META; 6814 break; 6815 case offsetof(struct xdp_md, data_end): 6816 info->reg_type = PTR_TO_PACKET_END; 6817 break; 6818 } 6819 6820 return __is_valid_xdp_access(off, size); 6821 } 6822 6823 void bpf_warn_invalid_xdp_action(u32 act) 6824 { 6825 const u32 act_max = XDP_REDIRECT; 6826 6827 WARN_ONCE(1, "%s XDP return value %u, expect packet loss!\n", 6828 act > act_max ? "Illegal" : "Driver unsupported", 6829 act); 6830 } 6831 EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action); 6832 6833 static bool sock_addr_is_valid_access(int off, int size, 6834 enum bpf_access_type type, 6835 const struct bpf_prog *prog, 6836 struct bpf_insn_access_aux *info) 6837 { 6838 const int size_default = sizeof(__u32); 6839 6840 if (off < 0 || off >= sizeof(struct bpf_sock_addr)) 6841 return false; 6842 if (off % size != 0) 6843 return false; 6844 6845 /* Disallow access to IPv6 fields from IPv4 contex and vise 6846 * versa. 6847 */ 6848 switch (off) { 6849 case bpf_ctx_range(struct bpf_sock_addr, user_ip4): 6850 switch (prog->expected_attach_type) { 6851 case BPF_CGROUP_INET4_BIND: 6852 case BPF_CGROUP_INET4_CONNECT: 6853 case BPF_CGROUP_UDP4_SENDMSG: 6854 case BPF_CGROUP_UDP4_RECVMSG: 6855 break; 6856 default: 6857 return false; 6858 } 6859 break; 6860 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 6861 switch (prog->expected_attach_type) { 6862 case BPF_CGROUP_INET6_BIND: 6863 case BPF_CGROUP_INET6_CONNECT: 6864 case BPF_CGROUP_UDP6_SENDMSG: 6865 case BPF_CGROUP_UDP6_RECVMSG: 6866 break; 6867 default: 6868 return false; 6869 } 6870 break; 6871 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): 6872 switch (prog->expected_attach_type) { 6873 case BPF_CGROUP_UDP4_SENDMSG: 6874 break; 6875 default: 6876 return false; 6877 } 6878 break; 6879 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 6880 msg_src_ip6[3]): 6881 switch (prog->expected_attach_type) { 6882 case BPF_CGROUP_UDP6_SENDMSG: 6883 break; 6884 default: 6885 return false; 6886 } 6887 break; 6888 } 6889 6890 switch (off) { 6891 case bpf_ctx_range(struct bpf_sock_addr, user_ip4): 6892 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 6893 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): 6894 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 6895 msg_src_ip6[3]): 6896 if (type == BPF_READ) { 6897 bpf_ctx_record_field_size(info, size_default); 6898 6899 if (bpf_ctx_wide_access_ok(off, size, 6900 struct bpf_sock_addr, 6901 user_ip6)) 6902 return true; 6903 6904 if (bpf_ctx_wide_access_ok(off, size, 6905 struct bpf_sock_addr, 6906 msg_src_ip6)) 6907 return true; 6908 6909 if (!bpf_ctx_narrow_access_ok(off, size, size_default)) 6910 return false; 6911 } else { 6912 if (bpf_ctx_wide_access_ok(off, size, 6913 struct bpf_sock_addr, 6914 user_ip6)) 6915 return true; 6916 6917 if (bpf_ctx_wide_access_ok(off, size, 6918 struct bpf_sock_addr, 6919 msg_src_ip6)) 6920 return true; 6921 6922 if (size != size_default) 6923 return false; 6924 } 6925 break; 6926 case bpf_ctx_range(struct bpf_sock_addr, user_port): 6927 if (size != size_default) 6928 return false; 6929 break; 6930 case offsetof(struct bpf_sock_addr, sk): 6931 if (type != BPF_READ) 6932 return false; 6933 if (size != sizeof(__u64)) 6934 return false; 6935 info->reg_type = PTR_TO_SOCKET; 6936 break; 6937 default: 6938 if (type == BPF_READ) { 6939 if (size != size_default) 6940 return false; 6941 } else { 6942 return false; 6943 } 6944 } 6945 6946 return true; 6947 } 6948 6949 static bool sock_ops_is_valid_access(int off, int size, 6950 enum bpf_access_type type, 6951 const struct bpf_prog *prog, 6952 struct bpf_insn_access_aux *info) 6953 { 6954 const int size_default = sizeof(__u32); 6955 6956 if (off < 0 || off >= sizeof(struct bpf_sock_ops)) 6957 return false; 6958 6959 /* The verifier guarantees that size > 0. */ 6960 if (off % size != 0) 6961 return false; 6962 6963 if (type == BPF_WRITE) { 6964 switch (off) { 6965 case offsetof(struct bpf_sock_ops, reply): 6966 case offsetof(struct bpf_sock_ops, sk_txhash): 6967 if (size != size_default) 6968 return false; 6969 break; 6970 default: 6971 return false; 6972 } 6973 } else { 6974 switch (off) { 6975 case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received, 6976 bytes_acked): 6977 if (size != sizeof(__u64)) 6978 return false; 6979 break; 6980 case offsetof(struct bpf_sock_ops, sk): 6981 if (size != sizeof(__u64)) 6982 return false; 6983 info->reg_type = PTR_TO_SOCKET_OR_NULL; 6984 break; 6985 default: 6986 if (size != size_default) 6987 return false; 6988 break; 6989 } 6990 } 6991 6992 return true; 6993 } 6994 6995 static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write, 6996 const struct bpf_prog *prog) 6997 { 6998 return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP); 6999 } 7000 7001 static bool sk_skb_is_valid_access(int off, int size, 7002 enum bpf_access_type type, 7003 const struct bpf_prog *prog, 7004 struct bpf_insn_access_aux *info) 7005 { 7006 switch (off) { 7007 case bpf_ctx_range(struct __sk_buff, tc_classid): 7008 case bpf_ctx_range(struct __sk_buff, data_meta): 7009 case bpf_ctx_range(struct __sk_buff, tstamp): 7010 case bpf_ctx_range(struct __sk_buff, wire_len): 7011 return false; 7012 } 7013 7014 if (type == BPF_WRITE) { 7015 switch (off) { 7016 case bpf_ctx_range(struct __sk_buff, tc_index): 7017 case bpf_ctx_range(struct __sk_buff, priority): 7018 break; 7019 default: 7020 return false; 7021 } 7022 } 7023 7024 switch (off) { 7025 case bpf_ctx_range(struct __sk_buff, mark): 7026 return false; 7027 case bpf_ctx_range(struct __sk_buff, data): 7028 info->reg_type = PTR_TO_PACKET; 7029 break; 7030 case bpf_ctx_range(struct __sk_buff, data_end): 7031 info->reg_type = PTR_TO_PACKET_END; 7032 break; 7033 } 7034 7035 return bpf_skb_is_valid_access(off, size, type, prog, info); 7036 } 7037 7038 static bool sk_msg_is_valid_access(int off, int size, 7039 enum bpf_access_type type, 7040 const struct bpf_prog *prog, 7041 struct bpf_insn_access_aux *info) 7042 { 7043 if (type == BPF_WRITE) 7044 return false; 7045 7046 if (off % size != 0) 7047 return false; 7048 7049 switch (off) { 7050 case offsetof(struct sk_msg_md, data): 7051 info->reg_type = PTR_TO_PACKET; 7052 if (size != sizeof(__u64)) 7053 return false; 7054 break; 7055 case offsetof(struct sk_msg_md, data_end): 7056 info->reg_type = PTR_TO_PACKET_END; 7057 if (size != sizeof(__u64)) 7058 return false; 7059 break; 7060 case bpf_ctx_range(struct sk_msg_md, family): 7061 case bpf_ctx_range(struct sk_msg_md, remote_ip4): 7062 case bpf_ctx_range(struct sk_msg_md, local_ip4): 7063 case bpf_ctx_range_till(struct sk_msg_md, remote_ip6[0], remote_ip6[3]): 7064 case bpf_ctx_range_till(struct sk_msg_md, local_ip6[0], local_ip6[3]): 7065 case bpf_ctx_range(struct sk_msg_md, remote_port): 7066 case bpf_ctx_range(struct sk_msg_md, local_port): 7067 case bpf_ctx_range(struct sk_msg_md, size): 7068 if (size != sizeof(__u32)) 7069 return false; 7070 break; 7071 default: 7072 return false; 7073 } 7074 return true; 7075 } 7076 7077 static bool flow_dissector_is_valid_access(int off, int size, 7078 enum bpf_access_type type, 7079 const struct bpf_prog *prog, 7080 struct bpf_insn_access_aux *info) 7081 { 7082 const int size_default = sizeof(__u32); 7083 7084 if (off < 0 || off >= sizeof(struct __sk_buff)) 7085 return false; 7086 7087 if (type == BPF_WRITE) 7088 return false; 7089 7090 switch (off) { 7091 case bpf_ctx_range(struct __sk_buff, data): 7092 if (size != size_default) 7093 return false; 7094 info->reg_type = PTR_TO_PACKET; 7095 return true; 7096 case bpf_ctx_range(struct __sk_buff, data_end): 7097 if (size != size_default) 7098 return false; 7099 info->reg_type = PTR_TO_PACKET_END; 7100 return true; 7101 case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): 7102 if (size != sizeof(__u64)) 7103 return false; 7104 info->reg_type = PTR_TO_FLOW_KEYS; 7105 return true; 7106 default: 7107 return false; 7108 } 7109 } 7110 7111 static u32 flow_dissector_convert_ctx_access(enum bpf_access_type type, 7112 const struct bpf_insn *si, 7113 struct bpf_insn *insn_buf, 7114 struct bpf_prog *prog, 7115 u32 *target_size) 7116 7117 { 7118 struct bpf_insn *insn = insn_buf; 7119 7120 switch (si->off) { 7121 case offsetof(struct __sk_buff, data): 7122 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data), 7123 si->dst_reg, si->src_reg, 7124 offsetof(struct bpf_flow_dissector, data)); 7125 break; 7126 7127 case offsetof(struct __sk_buff, data_end): 7128 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data_end), 7129 si->dst_reg, si->src_reg, 7130 offsetof(struct bpf_flow_dissector, data_end)); 7131 break; 7132 7133 case offsetof(struct __sk_buff, flow_keys): 7134 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, flow_keys), 7135 si->dst_reg, si->src_reg, 7136 offsetof(struct bpf_flow_dissector, flow_keys)); 7137 break; 7138 } 7139 7140 return insn - insn_buf; 7141 } 7142 7143 static u32 bpf_convert_ctx_access(enum bpf_access_type type, 7144 const struct bpf_insn *si, 7145 struct bpf_insn *insn_buf, 7146 struct bpf_prog *prog, u32 *target_size) 7147 { 7148 struct bpf_insn *insn = insn_buf; 7149 int off; 7150 7151 switch (si->off) { 7152 case offsetof(struct __sk_buff, len): 7153 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7154 bpf_target_off(struct sk_buff, len, 4, 7155 target_size)); 7156 break; 7157 7158 case offsetof(struct __sk_buff, protocol): 7159 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 7160 bpf_target_off(struct sk_buff, protocol, 2, 7161 target_size)); 7162 break; 7163 7164 case offsetof(struct __sk_buff, vlan_proto): 7165 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 7166 bpf_target_off(struct sk_buff, vlan_proto, 2, 7167 target_size)); 7168 break; 7169 7170 case offsetof(struct __sk_buff, priority): 7171 if (type == BPF_WRITE) 7172 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 7173 bpf_target_off(struct sk_buff, priority, 4, 7174 target_size)); 7175 else 7176 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7177 bpf_target_off(struct sk_buff, priority, 4, 7178 target_size)); 7179 break; 7180 7181 case offsetof(struct __sk_buff, ingress_ifindex): 7182 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7183 bpf_target_off(struct sk_buff, skb_iif, 4, 7184 target_size)); 7185 break; 7186 7187 case offsetof(struct __sk_buff, ifindex): 7188 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 7189 si->dst_reg, si->src_reg, 7190 offsetof(struct sk_buff, dev)); 7191 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 7192 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7193 bpf_target_off(struct net_device, ifindex, 4, 7194 target_size)); 7195 break; 7196 7197 case offsetof(struct __sk_buff, hash): 7198 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7199 bpf_target_off(struct sk_buff, hash, 4, 7200 target_size)); 7201 break; 7202 7203 case offsetof(struct __sk_buff, mark): 7204 if (type == BPF_WRITE) 7205 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 7206 bpf_target_off(struct sk_buff, mark, 4, 7207 target_size)); 7208 else 7209 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7210 bpf_target_off(struct sk_buff, mark, 4, 7211 target_size)); 7212 break; 7213 7214 case offsetof(struct __sk_buff, pkt_type): 7215 *target_size = 1; 7216 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, 7217 PKT_TYPE_OFFSET()); 7218 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX); 7219 #ifdef __BIG_ENDIAN_BITFIELD 7220 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5); 7221 #endif 7222 break; 7223 7224 case offsetof(struct __sk_buff, queue_mapping): 7225 if (type == BPF_WRITE) { 7226 *insn++ = BPF_JMP_IMM(BPF_JGE, si->src_reg, NO_QUEUE_MAPPING, 1); 7227 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg, 7228 bpf_target_off(struct sk_buff, 7229 queue_mapping, 7230 2, target_size)); 7231 } else { 7232 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 7233 bpf_target_off(struct sk_buff, 7234 queue_mapping, 7235 2, target_size)); 7236 } 7237 break; 7238 7239 case offsetof(struct __sk_buff, vlan_present): 7240 *target_size = 1; 7241 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, 7242 PKT_VLAN_PRESENT_OFFSET()); 7243 if (PKT_VLAN_PRESENT_BIT) 7244 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, PKT_VLAN_PRESENT_BIT); 7245 if (PKT_VLAN_PRESENT_BIT < 7) 7246 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1); 7247 break; 7248 7249 case offsetof(struct __sk_buff, vlan_tci): 7250 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 7251 bpf_target_off(struct sk_buff, vlan_tci, 2, 7252 target_size)); 7253 break; 7254 7255 case offsetof(struct __sk_buff, cb[0]) ... 7256 offsetofend(struct __sk_buff, cb[4]) - 1: 7257 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, data) < 20); 7258 BUILD_BUG_ON((offsetof(struct sk_buff, cb) + 7259 offsetof(struct qdisc_skb_cb, data)) % 7260 sizeof(__u64)); 7261 7262 prog->cb_access = 1; 7263 off = si->off; 7264 off -= offsetof(struct __sk_buff, cb[0]); 7265 off += offsetof(struct sk_buff, cb); 7266 off += offsetof(struct qdisc_skb_cb, data); 7267 if (type == BPF_WRITE) 7268 *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg, 7269 si->src_reg, off); 7270 else 7271 *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg, 7272 si->src_reg, off); 7273 break; 7274 7275 case offsetof(struct __sk_buff, tc_classid): 7276 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, tc_classid) != 2); 7277 7278 off = si->off; 7279 off -= offsetof(struct __sk_buff, tc_classid); 7280 off += offsetof(struct sk_buff, cb); 7281 off += offsetof(struct qdisc_skb_cb, tc_classid); 7282 *target_size = 2; 7283 if (type == BPF_WRITE) 7284 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, 7285 si->src_reg, off); 7286 else 7287 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, 7288 si->src_reg, off); 7289 break; 7290 7291 case offsetof(struct __sk_buff, data): 7292 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 7293 si->dst_reg, si->src_reg, 7294 offsetof(struct sk_buff, data)); 7295 break; 7296 7297 case offsetof(struct __sk_buff, data_meta): 7298 off = si->off; 7299 off -= offsetof(struct __sk_buff, data_meta); 7300 off += offsetof(struct sk_buff, cb); 7301 off += offsetof(struct bpf_skb_data_end, data_meta); 7302 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, 7303 si->src_reg, off); 7304 break; 7305 7306 case offsetof(struct __sk_buff, data_end): 7307 off = si->off; 7308 off -= offsetof(struct __sk_buff, data_end); 7309 off += offsetof(struct sk_buff, cb); 7310 off += offsetof(struct bpf_skb_data_end, data_end); 7311 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, 7312 si->src_reg, off); 7313 break; 7314 7315 case offsetof(struct __sk_buff, tc_index): 7316 #ifdef CONFIG_NET_SCHED 7317 if (type == BPF_WRITE) 7318 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg, 7319 bpf_target_off(struct sk_buff, tc_index, 2, 7320 target_size)); 7321 else 7322 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 7323 bpf_target_off(struct sk_buff, tc_index, 2, 7324 target_size)); 7325 #else 7326 *target_size = 2; 7327 if (type == BPF_WRITE) 7328 *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg); 7329 else 7330 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 7331 #endif 7332 break; 7333 7334 case offsetof(struct __sk_buff, napi_id): 7335 #if defined(CONFIG_NET_RX_BUSY_POLL) 7336 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7337 bpf_target_off(struct sk_buff, napi_id, 4, 7338 target_size)); 7339 *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1); 7340 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 7341 #else 7342 *target_size = 4; 7343 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 7344 #endif 7345 break; 7346 case offsetof(struct __sk_buff, family): 7347 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); 7348 7349 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7350 si->dst_reg, si->src_reg, 7351 offsetof(struct sk_buff, sk)); 7352 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 7353 bpf_target_off(struct sock_common, 7354 skc_family, 7355 2, target_size)); 7356 break; 7357 case offsetof(struct __sk_buff, remote_ip4): 7358 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); 7359 7360 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7361 si->dst_reg, si->src_reg, 7362 offsetof(struct sk_buff, sk)); 7363 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7364 bpf_target_off(struct sock_common, 7365 skc_daddr, 7366 4, target_size)); 7367 break; 7368 case offsetof(struct __sk_buff, local_ip4): 7369 BUILD_BUG_ON(sizeof_field(struct sock_common, 7370 skc_rcv_saddr) != 4); 7371 7372 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7373 si->dst_reg, si->src_reg, 7374 offsetof(struct sk_buff, sk)); 7375 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7376 bpf_target_off(struct sock_common, 7377 skc_rcv_saddr, 7378 4, target_size)); 7379 break; 7380 case offsetof(struct __sk_buff, remote_ip6[0]) ... 7381 offsetof(struct __sk_buff, remote_ip6[3]): 7382 #if IS_ENABLED(CONFIG_IPV6) 7383 BUILD_BUG_ON(sizeof_field(struct sock_common, 7384 skc_v6_daddr.s6_addr32[0]) != 4); 7385 7386 off = si->off; 7387 off -= offsetof(struct __sk_buff, remote_ip6[0]); 7388 7389 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7390 si->dst_reg, si->src_reg, 7391 offsetof(struct sk_buff, sk)); 7392 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7393 offsetof(struct sock_common, 7394 skc_v6_daddr.s6_addr32[0]) + 7395 off); 7396 #else 7397 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 7398 #endif 7399 break; 7400 case offsetof(struct __sk_buff, local_ip6[0]) ... 7401 offsetof(struct __sk_buff, local_ip6[3]): 7402 #if IS_ENABLED(CONFIG_IPV6) 7403 BUILD_BUG_ON(sizeof_field(struct sock_common, 7404 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 7405 7406 off = si->off; 7407 off -= offsetof(struct __sk_buff, local_ip6[0]); 7408 7409 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7410 si->dst_reg, si->src_reg, 7411 offsetof(struct sk_buff, sk)); 7412 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7413 offsetof(struct sock_common, 7414 skc_v6_rcv_saddr.s6_addr32[0]) + 7415 off); 7416 #else 7417 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 7418 #endif 7419 break; 7420 7421 case offsetof(struct __sk_buff, remote_port): 7422 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); 7423 7424 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7425 si->dst_reg, si->src_reg, 7426 offsetof(struct sk_buff, sk)); 7427 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 7428 bpf_target_off(struct sock_common, 7429 skc_dport, 7430 2, target_size)); 7431 #ifndef __BIG_ENDIAN_BITFIELD 7432 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 7433 #endif 7434 break; 7435 7436 case offsetof(struct __sk_buff, local_port): 7437 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); 7438 7439 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7440 si->dst_reg, si->src_reg, 7441 offsetof(struct sk_buff, sk)); 7442 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 7443 bpf_target_off(struct sock_common, 7444 skc_num, 2, target_size)); 7445 break; 7446 7447 case offsetof(struct __sk_buff, tstamp): 7448 BUILD_BUG_ON(sizeof_field(struct sk_buff, tstamp) != 8); 7449 7450 if (type == BPF_WRITE) 7451 *insn++ = BPF_STX_MEM(BPF_DW, 7452 si->dst_reg, si->src_reg, 7453 bpf_target_off(struct sk_buff, 7454 tstamp, 8, 7455 target_size)); 7456 else 7457 *insn++ = BPF_LDX_MEM(BPF_DW, 7458 si->dst_reg, si->src_reg, 7459 bpf_target_off(struct sk_buff, 7460 tstamp, 8, 7461 target_size)); 7462 break; 7463 7464 case offsetof(struct __sk_buff, gso_segs): 7465 /* si->dst_reg = skb_shinfo(SKB); */ 7466 #ifdef NET_SKBUFF_DATA_USES_OFFSET 7467 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), 7468 BPF_REG_AX, si->src_reg, 7469 offsetof(struct sk_buff, end)); 7470 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, head), 7471 si->dst_reg, si->src_reg, 7472 offsetof(struct sk_buff, head)); 7473 *insn++ = BPF_ALU64_REG(BPF_ADD, si->dst_reg, BPF_REG_AX); 7474 #else 7475 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), 7476 si->dst_reg, si->src_reg, 7477 offsetof(struct sk_buff, end)); 7478 #endif 7479 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_segs), 7480 si->dst_reg, si->dst_reg, 7481 bpf_target_off(struct skb_shared_info, 7482 gso_segs, 2, 7483 target_size)); 7484 break; 7485 case offsetof(struct __sk_buff, wire_len): 7486 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, pkt_len) != 4); 7487 7488 off = si->off; 7489 off -= offsetof(struct __sk_buff, wire_len); 7490 off += offsetof(struct sk_buff, cb); 7491 off += offsetof(struct qdisc_skb_cb, pkt_len); 7492 *target_size = 4; 7493 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, off); 7494 break; 7495 7496 case offsetof(struct __sk_buff, sk): 7497 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7498 si->dst_reg, si->src_reg, 7499 offsetof(struct sk_buff, sk)); 7500 break; 7501 } 7502 7503 return insn - insn_buf; 7504 } 7505 7506 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 7507 const struct bpf_insn *si, 7508 struct bpf_insn *insn_buf, 7509 struct bpf_prog *prog, u32 *target_size) 7510 { 7511 struct bpf_insn *insn = insn_buf; 7512 int off; 7513 7514 switch (si->off) { 7515 case offsetof(struct bpf_sock, bound_dev_if): 7516 BUILD_BUG_ON(sizeof_field(struct sock, sk_bound_dev_if) != 4); 7517 7518 if (type == BPF_WRITE) 7519 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 7520 offsetof(struct sock, sk_bound_dev_if)); 7521 else 7522 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7523 offsetof(struct sock, sk_bound_dev_if)); 7524 break; 7525 7526 case offsetof(struct bpf_sock, mark): 7527 BUILD_BUG_ON(sizeof_field(struct sock, sk_mark) != 4); 7528 7529 if (type == BPF_WRITE) 7530 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 7531 offsetof(struct sock, sk_mark)); 7532 else 7533 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7534 offsetof(struct sock, sk_mark)); 7535 break; 7536 7537 case offsetof(struct bpf_sock, priority): 7538 BUILD_BUG_ON(sizeof_field(struct sock, sk_priority) != 4); 7539 7540 if (type == BPF_WRITE) 7541 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 7542 offsetof(struct sock, sk_priority)); 7543 else 7544 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7545 offsetof(struct sock, sk_priority)); 7546 break; 7547 7548 case offsetof(struct bpf_sock, family): 7549 *insn++ = BPF_LDX_MEM( 7550 BPF_FIELD_SIZEOF(struct sock_common, skc_family), 7551 si->dst_reg, si->src_reg, 7552 bpf_target_off(struct sock_common, 7553 skc_family, 7554 sizeof_field(struct sock_common, 7555 skc_family), 7556 target_size)); 7557 break; 7558 7559 case offsetof(struct bpf_sock, type): 7560 *insn++ = BPF_LDX_MEM( 7561 BPF_FIELD_SIZEOF(struct sock, sk_type), 7562 si->dst_reg, si->src_reg, 7563 bpf_target_off(struct sock, sk_type, 7564 sizeof_field(struct sock, sk_type), 7565 target_size)); 7566 break; 7567 7568 case offsetof(struct bpf_sock, protocol): 7569 *insn++ = BPF_LDX_MEM( 7570 BPF_FIELD_SIZEOF(struct sock, sk_protocol), 7571 si->dst_reg, si->src_reg, 7572 bpf_target_off(struct sock, sk_protocol, 7573 sizeof_field(struct sock, sk_protocol), 7574 target_size)); 7575 break; 7576 7577 case offsetof(struct bpf_sock, src_ip4): 7578 *insn++ = BPF_LDX_MEM( 7579 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 7580 bpf_target_off(struct sock_common, skc_rcv_saddr, 7581 sizeof_field(struct sock_common, 7582 skc_rcv_saddr), 7583 target_size)); 7584 break; 7585 7586 case offsetof(struct bpf_sock, dst_ip4): 7587 *insn++ = BPF_LDX_MEM( 7588 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 7589 bpf_target_off(struct sock_common, skc_daddr, 7590 sizeof_field(struct sock_common, 7591 skc_daddr), 7592 target_size)); 7593 break; 7594 7595 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 7596 #if IS_ENABLED(CONFIG_IPV6) 7597 off = si->off; 7598 off -= offsetof(struct bpf_sock, src_ip6[0]); 7599 *insn++ = BPF_LDX_MEM( 7600 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 7601 bpf_target_off( 7602 struct sock_common, 7603 skc_v6_rcv_saddr.s6_addr32[0], 7604 sizeof_field(struct sock_common, 7605 skc_v6_rcv_saddr.s6_addr32[0]), 7606 target_size) + off); 7607 #else 7608 (void)off; 7609 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 7610 #endif 7611 break; 7612 7613 case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): 7614 #if IS_ENABLED(CONFIG_IPV6) 7615 off = si->off; 7616 off -= offsetof(struct bpf_sock, dst_ip6[0]); 7617 *insn++ = BPF_LDX_MEM( 7618 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 7619 bpf_target_off(struct sock_common, 7620 skc_v6_daddr.s6_addr32[0], 7621 sizeof_field(struct sock_common, 7622 skc_v6_daddr.s6_addr32[0]), 7623 target_size) + off); 7624 #else 7625 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 7626 *target_size = 4; 7627 #endif 7628 break; 7629 7630 case offsetof(struct bpf_sock, src_port): 7631 *insn++ = BPF_LDX_MEM( 7632 BPF_FIELD_SIZEOF(struct sock_common, skc_num), 7633 si->dst_reg, si->src_reg, 7634 bpf_target_off(struct sock_common, skc_num, 7635 sizeof_field(struct sock_common, 7636 skc_num), 7637 target_size)); 7638 break; 7639 7640 case offsetof(struct bpf_sock, dst_port): 7641 *insn++ = BPF_LDX_MEM( 7642 BPF_FIELD_SIZEOF(struct sock_common, skc_dport), 7643 si->dst_reg, si->src_reg, 7644 bpf_target_off(struct sock_common, skc_dport, 7645 sizeof_field(struct sock_common, 7646 skc_dport), 7647 target_size)); 7648 break; 7649 7650 case offsetof(struct bpf_sock, state): 7651 *insn++ = BPF_LDX_MEM( 7652 BPF_FIELD_SIZEOF(struct sock_common, skc_state), 7653 si->dst_reg, si->src_reg, 7654 bpf_target_off(struct sock_common, skc_state, 7655 sizeof_field(struct sock_common, 7656 skc_state), 7657 target_size)); 7658 break; 7659 } 7660 7661 return insn - insn_buf; 7662 } 7663 7664 static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type, 7665 const struct bpf_insn *si, 7666 struct bpf_insn *insn_buf, 7667 struct bpf_prog *prog, u32 *target_size) 7668 { 7669 struct bpf_insn *insn = insn_buf; 7670 7671 switch (si->off) { 7672 case offsetof(struct __sk_buff, ifindex): 7673 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 7674 si->dst_reg, si->src_reg, 7675 offsetof(struct sk_buff, dev)); 7676 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7677 bpf_target_off(struct net_device, ifindex, 4, 7678 target_size)); 7679 break; 7680 default: 7681 return bpf_convert_ctx_access(type, si, insn_buf, prog, 7682 target_size); 7683 } 7684 7685 return insn - insn_buf; 7686 } 7687 7688 static u32 xdp_convert_ctx_access(enum bpf_access_type type, 7689 const struct bpf_insn *si, 7690 struct bpf_insn *insn_buf, 7691 struct bpf_prog *prog, u32 *target_size) 7692 { 7693 struct bpf_insn *insn = insn_buf; 7694 7695 switch (si->off) { 7696 case offsetof(struct xdp_md, data): 7697 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data), 7698 si->dst_reg, si->src_reg, 7699 offsetof(struct xdp_buff, data)); 7700 break; 7701 case offsetof(struct xdp_md, data_meta): 7702 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta), 7703 si->dst_reg, si->src_reg, 7704 offsetof(struct xdp_buff, data_meta)); 7705 break; 7706 case offsetof(struct xdp_md, data_end): 7707 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end), 7708 si->dst_reg, si->src_reg, 7709 offsetof(struct xdp_buff, data_end)); 7710 break; 7711 case offsetof(struct xdp_md, ingress_ifindex): 7712 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), 7713 si->dst_reg, si->src_reg, 7714 offsetof(struct xdp_buff, rxq)); 7715 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev), 7716 si->dst_reg, si->dst_reg, 7717 offsetof(struct xdp_rxq_info, dev)); 7718 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7719 offsetof(struct net_device, ifindex)); 7720 break; 7721 case offsetof(struct xdp_md, rx_queue_index): 7722 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), 7723 si->dst_reg, si->src_reg, 7724 offsetof(struct xdp_buff, rxq)); 7725 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7726 offsetof(struct xdp_rxq_info, 7727 queue_index)); 7728 break; 7729 } 7730 7731 return insn - insn_buf; 7732 } 7733 7734 /* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of 7735 * context Structure, F is Field in context structure that contains a pointer 7736 * to Nested Structure of type NS that has the field NF. 7737 * 7738 * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make 7739 * sure that SIZE is not greater than actual size of S.F.NF. 7740 * 7741 * If offset OFF is provided, the load happens from that offset relative to 7742 * offset of NF. 7743 */ 7744 #define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF) \ 7745 do { \ 7746 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg, \ 7747 si->src_reg, offsetof(S, F)); \ 7748 *insn++ = BPF_LDX_MEM( \ 7749 SIZE, si->dst_reg, si->dst_reg, \ 7750 bpf_target_off(NS, NF, sizeof_field(NS, NF), \ 7751 target_size) \ 7752 + OFF); \ 7753 } while (0) 7754 7755 #define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF) \ 7756 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, \ 7757 BPF_FIELD_SIZEOF(NS, NF), 0) 7758 7759 /* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to 7760 * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation. 7761 * 7762 * In addition it uses Temporary Field TF (member of struct S) as the 3rd 7763 * "register" since two registers available in convert_ctx_access are not 7764 * enough: we can't override neither SRC, since it contains value to store, nor 7765 * DST since it contains pointer to context that may be used by later 7766 * instructions. But we need a temporary place to save pointer to nested 7767 * structure whose field we want to store to. 7768 */ 7769 #define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, OFF, TF) \ 7770 do { \ 7771 int tmp_reg = BPF_REG_9; \ 7772 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ 7773 --tmp_reg; \ 7774 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ 7775 --tmp_reg; \ 7776 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg, \ 7777 offsetof(S, TF)); \ 7778 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg, \ 7779 si->dst_reg, offsetof(S, F)); \ 7780 *insn++ = BPF_STX_MEM(SIZE, tmp_reg, si->src_reg, \ 7781 bpf_target_off(NS, NF, sizeof_field(NS, NF), \ 7782 target_size) \ 7783 + OFF); \ 7784 *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg, \ 7785 offsetof(S, TF)); \ 7786 } while (0) 7787 7788 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \ 7789 TF) \ 7790 do { \ 7791 if (type == BPF_WRITE) { \ 7792 SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, \ 7793 OFF, TF); \ 7794 } else { \ 7795 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( \ 7796 S, NS, F, NF, SIZE, OFF); \ 7797 } \ 7798 } while (0) 7799 7800 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF) \ 7801 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( \ 7802 S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF) 7803 7804 static u32 sock_addr_convert_ctx_access(enum bpf_access_type type, 7805 const struct bpf_insn *si, 7806 struct bpf_insn *insn_buf, 7807 struct bpf_prog *prog, u32 *target_size) 7808 { 7809 struct bpf_insn *insn = insn_buf; 7810 int off; 7811 7812 switch (si->off) { 7813 case offsetof(struct bpf_sock_addr, user_family): 7814 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 7815 struct sockaddr, uaddr, sa_family); 7816 break; 7817 7818 case offsetof(struct bpf_sock_addr, user_ip4): 7819 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 7820 struct bpf_sock_addr_kern, struct sockaddr_in, uaddr, 7821 sin_addr, BPF_SIZE(si->code), 0, tmp_reg); 7822 break; 7823 7824 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 7825 off = si->off; 7826 off -= offsetof(struct bpf_sock_addr, user_ip6[0]); 7827 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 7828 struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr, 7829 sin6_addr.s6_addr32[0], BPF_SIZE(si->code), off, 7830 tmp_reg); 7831 break; 7832 7833 case offsetof(struct bpf_sock_addr, user_port): 7834 /* To get port we need to know sa_family first and then treat 7835 * sockaddr as either sockaddr_in or sockaddr_in6. 7836 * Though we can simplify since port field has same offset and 7837 * size in both structures. 7838 * Here we check this invariant and use just one of the 7839 * structures if it's true. 7840 */ 7841 BUILD_BUG_ON(offsetof(struct sockaddr_in, sin_port) != 7842 offsetof(struct sockaddr_in6, sin6_port)); 7843 BUILD_BUG_ON(sizeof_field(struct sockaddr_in, sin_port) != 7844 sizeof_field(struct sockaddr_in6, sin6_port)); 7845 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(struct bpf_sock_addr_kern, 7846 struct sockaddr_in6, uaddr, 7847 sin6_port, tmp_reg); 7848 break; 7849 7850 case offsetof(struct bpf_sock_addr, family): 7851 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 7852 struct sock, sk, sk_family); 7853 break; 7854 7855 case offsetof(struct bpf_sock_addr, type): 7856 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 7857 struct sock, sk, sk_type); 7858 break; 7859 7860 case offsetof(struct bpf_sock_addr, protocol): 7861 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 7862 struct sock, sk, sk_protocol); 7863 break; 7864 7865 case offsetof(struct bpf_sock_addr, msg_src_ip4): 7866 /* Treat t_ctx as struct in_addr for msg_src_ip4. */ 7867 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 7868 struct bpf_sock_addr_kern, struct in_addr, t_ctx, 7869 s_addr, BPF_SIZE(si->code), 0, tmp_reg); 7870 break; 7871 7872 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 7873 msg_src_ip6[3]): 7874 off = si->off; 7875 off -= offsetof(struct bpf_sock_addr, msg_src_ip6[0]); 7876 /* Treat t_ctx as struct in6_addr for msg_src_ip6. */ 7877 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 7878 struct bpf_sock_addr_kern, struct in6_addr, t_ctx, 7879 s6_addr32[0], BPF_SIZE(si->code), off, tmp_reg); 7880 break; 7881 case offsetof(struct bpf_sock_addr, sk): 7882 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_addr_kern, sk), 7883 si->dst_reg, si->src_reg, 7884 offsetof(struct bpf_sock_addr_kern, sk)); 7885 break; 7886 } 7887 7888 return insn - insn_buf; 7889 } 7890 7891 static u32 sock_ops_convert_ctx_access(enum bpf_access_type type, 7892 const struct bpf_insn *si, 7893 struct bpf_insn *insn_buf, 7894 struct bpf_prog *prog, 7895 u32 *target_size) 7896 { 7897 struct bpf_insn *insn = insn_buf; 7898 int off; 7899 7900 /* Helper macro for adding read access to tcp_sock or sock fields. */ 7901 #define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ 7902 do { \ 7903 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \ 7904 sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \ 7905 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 7906 struct bpf_sock_ops_kern, \ 7907 is_fullsock), \ 7908 si->dst_reg, si->src_reg, \ 7909 offsetof(struct bpf_sock_ops_kern, \ 7910 is_fullsock)); \ 7911 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 2); \ 7912 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 7913 struct bpf_sock_ops_kern, sk),\ 7914 si->dst_reg, si->src_reg, \ 7915 offsetof(struct bpf_sock_ops_kern, sk));\ 7916 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ, \ 7917 OBJ_FIELD), \ 7918 si->dst_reg, si->dst_reg, \ 7919 offsetof(OBJ, OBJ_FIELD)); \ 7920 } while (0) 7921 7922 #define SOCK_OPS_GET_TCP_SOCK_FIELD(FIELD) \ 7923 SOCK_OPS_GET_FIELD(FIELD, FIELD, struct tcp_sock) 7924 7925 /* Helper macro for adding write access to tcp_sock or sock fields. 7926 * The macro is called with two registers, dst_reg which contains a pointer 7927 * to ctx (context) and src_reg which contains the value that should be 7928 * stored. However, we need an additional register since we cannot overwrite 7929 * dst_reg because it may be used later in the program. 7930 * Instead we "borrow" one of the other register. We first save its value 7931 * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore 7932 * it at the end of the macro. 7933 */ 7934 #define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ 7935 do { \ 7936 int reg = BPF_REG_9; \ 7937 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \ 7938 sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \ 7939 if (si->dst_reg == reg || si->src_reg == reg) \ 7940 reg--; \ 7941 if (si->dst_reg == reg || si->src_reg == reg) \ 7942 reg--; \ 7943 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg, \ 7944 offsetof(struct bpf_sock_ops_kern, \ 7945 temp)); \ 7946 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 7947 struct bpf_sock_ops_kern, \ 7948 is_fullsock), \ 7949 reg, si->dst_reg, \ 7950 offsetof(struct bpf_sock_ops_kern, \ 7951 is_fullsock)); \ 7952 *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2); \ 7953 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 7954 struct bpf_sock_ops_kern, sk),\ 7955 reg, si->dst_reg, \ 7956 offsetof(struct bpf_sock_ops_kern, sk));\ 7957 *insn++ = BPF_STX_MEM(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD), \ 7958 reg, si->src_reg, \ 7959 offsetof(OBJ, OBJ_FIELD)); \ 7960 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg, \ 7961 offsetof(struct bpf_sock_ops_kern, \ 7962 temp)); \ 7963 } while (0) 7964 7965 #define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE) \ 7966 do { \ 7967 if (TYPE == BPF_WRITE) \ 7968 SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ 7969 else \ 7970 SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ 7971 } while (0) 7972 7973 if (insn > insn_buf) 7974 return insn - insn_buf; 7975 7976 switch (si->off) { 7977 case offsetof(struct bpf_sock_ops, op) ... 7978 offsetof(struct bpf_sock_ops, replylong[3]): 7979 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, op) != 7980 sizeof_field(struct bpf_sock_ops_kern, op)); 7981 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, reply) != 7982 sizeof_field(struct bpf_sock_ops_kern, reply)); 7983 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, replylong) != 7984 sizeof_field(struct bpf_sock_ops_kern, replylong)); 7985 off = si->off; 7986 off -= offsetof(struct bpf_sock_ops, op); 7987 off += offsetof(struct bpf_sock_ops_kern, op); 7988 if (type == BPF_WRITE) 7989 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 7990 off); 7991 else 7992 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7993 off); 7994 break; 7995 7996 case offsetof(struct bpf_sock_ops, family): 7997 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); 7998 7999 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8000 struct bpf_sock_ops_kern, sk), 8001 si->dst_reg, si->src_reg, 8002 offsetof(struct bpf_sock_ops_kern, sk)); 8003 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8004 offsetof(struct sock_common, skc_family)); 8005 break; 8006 8007 case offsetof(struct bpf_sock_ops, remote_ip4): 8008 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); 8009 8010 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8011 struct bpf_sock_ops_kern, sk), 8012 si->dst_reg, si->src_reg, 8013 offsetof(struct bpf_sock_ops_kern, sk)); 8014 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8015 offsetof(struct sock_common, skc_daddr)); 8016 break; 8017 8018 case offsetof(struct bpf_sock_ops, local_ip4): 8019 BUILD_BUG_ON(sizeof_field(struct sock_common, 8020 skc_rcv_saddr) != 4); 8021 8022 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8023 struct bpf_sock_ops_kern, sk), 8024 si->dst_reg, si->src_reg, 8025 offsetof(struct bpf_sock_ops_kern, sk)); 8026 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8027 offsetof(struct sock_common, 8028 skc_rcv_saddr)); 8029 break; 8030 8031 case offsetof(struct bpf_sock_ops, remote_ip6[0]) ... 8032 offsetof(struct bpf_sock_ops, remote_ip6[3]): 8033 #if IS_ENABLED(CONFIG_IPV6) 8034 BUILD_BUG_ON(sizeof_field(struct sock_common, 8035 skc_v6_daddr.s6_addr32[0]) != 4); 8036 8037 off = si->off; 8038 off -= offsetof(struct bpf_sock_ops, remote_ip6[0]); 8039 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8040 struct bpf_sock_ops_kern, sk), 8041 si->dst_reg, si->src_reg, 8042 offsetof(struct bpf_sock_ops_kern, sk)); 8043 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8044 offsetof(struct sock_common, 8045 skc_v6_daddr.s6_addr32[0]) + 8046 off); 8047 #else 8048 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 8049 #endif 8050 break; 8051 8052 case offsetof(struct bpf_sock_ops, local_ip6[0]) ... 8053 offsetof(struct bpf_sock_ops, local_ip6[3]): 8054 #if IS_ENABLED(CONFIG_IPV6) 8055 BUILD_BUG_ON(sizeof_field(struct sock_common, 8056 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 8057 8058 off = si->off; 8059 off -= offsetof(struct bpf_sock_ops, local_ip6[0]); 8060 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8061 struct bpf_sock_ops_kern, sk), 8062 si->dst_reg, si->src_reg, 8063 offsetof(struct bpf_sock_ops_kern, sk)); 8064 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8065 offsetof(struct sock_common, 8066 skc_v6_rcv_saddr.s6_addr32[0]) + 8067 off); 8068 #else 8069 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 8070 #endif 8071 break; 8072 8073 case offsetof(struct bpf_sock_ops, remote_port): 8074 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); 8075 8076 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8077 struct bpf_sock_ops_kern, sk), 8078 si->dst_reg, si->src_reg, 8079 offsetof(struct bpf_sock_ops_kern, sk)); 8080 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8081 offsetof(struct sock_common, skc_dport)); 8082 #ifndef __BIG_ENDIAN_BITFIELD 8083 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 8084 #endif 8085 break; 8086 8087 case offsetof(struct bpf_sock_ops, local_port): 8088 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); 8089 8090 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8091 struct bpf_sock_ops_kern, sk), 8092 si->dst_reg, si->src_reg, 8093 offsetof(struct bpf_sock_ops_kern, sk)); 8094 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8095 offsetof(struct sock_common, skc_num)); 8096 break; 8097 8098 case offsetof(struct bpf_sock_ops, is_fullsock): 8099 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8100 struct bpf_sock_ops_kern, 8101 is_fullsock), 8102 si->dst_reg, si->src_reg, 8103 offsetof(struct bpf_sock_ops_kern, 8104 is_fullsock)); 8105 break; 8106 8107 case offsetof(struct bpf_sock_ops, state): 8108 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_state) != 1); 8109 8110 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8111 struct bpf_sock_ops_kern, sk), 8112 si->dst_reg, si->src_reg, 8113 offsetof(struct bpf_sock_ops_kern, sk)); 8114 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg, 8115 offsetof(struct sock_common, skc_state)); 8116 break; 8117 8118 case offsetof(struct bpf_sock_ops, rtt_min): 8119 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) != 8120 sizeof(struct minmax)); 8121 BUILD_BUG_ON(sizeof(struct minmax) < 8122 sizeof(struct minmax_sample)); 8123 8124 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8125 struct bpf_sock_ops_kern, sk), 8126 si->dst_reg, si->src_reg, 8127 offsetof(struct bpf_sock_ops_kern, sk)); 8128 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8129 offsetof(struct tcp_sock, rtt_min) + 8130 sizeof_field(struct minmax_sample, t)); 8131 break; 8132 8133 case offsetof(struct bpf_sock_ops, bpf_sock_ops_cb_flags): 8134 SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags, 8135 struct tcp_sock); 8136 break; 8137 8138 case offsetof(struct bpf_sock_ops, sk_txhash): 8139 SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash, 8140 struct sock, type); 8141 break; 8142 case offsetof(struct bpf_sock_ops, snd_cwnd): 8143 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_cwnd); 8144 break; 8145 case offsetof(struct bpf_sock_ops, srtt_us): 8146 SOCK_OPS_GET_TCP_SOCK_FIELD(srtt_us); 8147 break; 8148 case offsetof(struct bpf_sock_ops, snd_ssthresh): 8149 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_ssthresh); 8150 break; 8151 case offsetof(struct bpf_sock_ops, rcv_nxt): 8152 SOCK_OPS_GET_TCP_SOCK_FIELD(rcv_nxt); 8153 break; 8154 case offsetof(struct bpf_sock_ops, snd_nxt): 8155 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_nxt); 8156 break; 8157 case offsetof(struct bpf_sock_ops, snd_una): 8158 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_una); 8159 break; 8160 case offsetof(struct bpf_sock_ops, mss_cache): 8161 SOCK_OPS_GET_TCP_SOCK_FIELD(mss_cache); 8162 break; 8163 case offsetof(struct bpf_sock_ops, ecn_flags): 8164 SOCK_OPS_GET_TCP_SOCK_FIELD(ecn_flags); 8165 break; 8166 case offsetof(struct bpf_sock_ops, rate_delivered): 8167 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_delivered); 8168 break; 8169 case offsetof(struct bpf_sock_ops, rate_interval_us): 8170 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_interval_us); 8171 break; 8172 case offsetof(struct bpf_sock_ops, packets_out): 8173 SOCK_OPS_GET_TCP_SOCK_FIELD(packets_out); 8174 break; 8175 case offsetof(struct bpf_sock_ops, retrans_out): 8176 SOCK_OPS_GET_TCP_SOCK_FIELD(retrans_out); 8177 break; 8178 case offsetof(struct bpf_sock_ops, total_retrans): 8179 SOCK_OPS_GET_TCP_SOCK_FIELD(total_retrans); 8180 break; 8181 case offsetof(struct bpf_sock_ops, segs_in): 8182 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_in); 8183 break; 8184 case offsetof(struct bpf_sock_ops, data_segs_in): 8185 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_in); 8186 break; 8187 case offsetof(struct bpf_sock_ops, segs_out): 8188 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_out); 8189 break; 8190 case offsetof(struct bpf_sock_ops, data_segs_out): 8191 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_out); 8192 break; 8193 case offsetof(struct bpf_sock_ops, lost_out): 8194 SOCK_OPS_GET_TCP_SOCK_FIELD(lost_out); 8195 break; 8196 case offsetof(struct bpf_sock_ops, sacked_out): 8197 SOCK_OPS_GET_TCP_SOCK_FIELD(sacked_out); 8198 break; 8199 case offsetof(struct bpf_sock_ops, bytes_received): 8200 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_received); 8201 break; 8202 case offsetof(struct bpf_sock_ops, bytes_acked): 8203 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_acked); 8204 break; 8205 case offsetof(struct bpf_sock_ops, sk): 8206 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8207 struct bpf_sock_ops_kern, 8208 is_fullsock), 8209 si->dst_reg, si->src_reg, 8210 offsetof(struct bpf_sock_ops_kern, 8211 is_fullsock)); 8212 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 8213 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8214 struct bpf_sock_ops_kern, sk), 8215 si->dst_reg, si->src_reg, 8216 offsetof(struct bpf_sock_ops_kern, sk)); 8217 break; 8218 } 8219 return insn - insn_buf; 8220 } 8221 8222 static u32 sk_skb_convert_ctx_access(enum bpf_access_type type, 8223 const struct bpf_insn *si, 8224 struct bpf_insn *insn_buf, 8225 struct bpf_prog *prog, u32 *target_size) 8226 { 8227 struct bpf_insn *insn = insn_buf; 8228 int off; 8229 8230 switch (si->off) { 8231 case offsetof(struct __sk_buff, data_end): 8232 off = si->off; 8233 off -= offsetof(struct __sk_buff, data_end); 8234 off += offsetof(struct sk_buff, cb); 8235 off += offsetof(struct tcp_skb_cb, bpf.data_end); 8236 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, 8237 si->src_reg, off); 8238 break; 8239 default: 8240 return bpf_convert_ctx_access(type, si, insn_buf, prog, 8241 target_size); 8242 } 8243 8244 return insn - insn_buf; 8245 } 8246 8247 static u32 sk_msg_convert_ctx_access(enum bpf_access_type type, 8248 const struct bpf_insn *si, 8249 struct bpf_insn *insn_buf, 8250 struct bpf_prog *prog, u32 *target_size) 8251 { 8252 struct bpf_insn *insn = insn_buf; 8253 #if IS_ENABLED(CONFIG_IPV6) 8254 int off; 8255 #endif 8256 8257 /* convert ctx uses the fact sg element is first in struct */ 8258 BUILD_BUG_ON(offsetof(struct sk_msg, sg) != 0); 8259 8260 switch (si->off) { 8261 case offsetof(struct sk_msg_md, data): 8262 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data), 8263 si->dst_reg, si->src_reg, 8264 offsetof(struct sk_msg, data)); 8265 break; 8266 case offsetof(struct sk_msg_md, data_end): 8267 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data_end), 8268 si->dst_reg, si->src_reg, 8269 offsetof(struct sk_msg, data_end)); 8270 break; 8271 case offsetof(struct sk_msg_md, family): 8272 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); 8273 8274 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8275 struct sk_msg, sk), 8276 si->dst_reg, si->src_reg, 8277 offsetof(struct sk_msg, sk)); 8278 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8279 offsetof(struct sock_common, skc_family)); 8280 break; 8281 8282 case offsetof(struct sk_msg_md, remote_ip4): 8283 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); 8284 8285 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8286 struct sk_msg, sk), 8287 si->dst_reg, si->src_reg, 8288 offsetof(struct sk_msg, sk)); 8289 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8290 offsetof(struct sock_common, skc_daddr)); 8291 break; 8292 8293 case offsetof(struct sk_msg_md, local_ip4): 8294 BUILD_BUG_ON(sizeof_field(struct sock_common, 8295 skc_rcv_saddr) != 4); 8296 8297 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8298 struct sk_msg, sk), 8299 si->dst_reg, si->src_reg, 8300 offsetof(struct sk_msg, sk)); 8301 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8302 offsetof(struct sock_common, 8303 skc_rcv_saddr)); 8304 break; 8305 8306 case offsetof(struct sk_msg_md, remote_ip6[0]) ... 8307 offsetof(struct sk_msg_md, remote_ip6[3]): 8308 #if IS_ENABLED(CONFIG_IPV6) 8309 BUILD_BUG_ON(sizeof_field(struct sock_common, 8310 skc_v6_daddr.s6_addr32[0]) != 4); 8311 8312 off = si->off; 8313 off -= offsetof(struct sk_msg_md, remote_ip6[0]); 8314 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8315 struct sk_msg, sk), 8316 si->dst_reg, si->src_reg, 8317 offsetof(struct sk_msg, sk)); 8318 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8319 offsetof(struct sock_common, 8320 skc_v6_daddr.s6_addr32[0]) + 8321 off); 8322 #else 8323 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 8324 #endif 8325 break; 8326 8327 case offsetof(struct sk_msg_md, local_ip6[0]) ... 8328 offsetof(struct sk_msg_md, local_ip6[3]): 8329 #if IS_ENABLED(CONFIG_IPV6) 8330 BUILD_BUG_ON(sizeof_field(struct sock_common, 8331 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 8332 8333 off = si->off; 8334 off -= offsetof(struct sk_msg_md, local_ip6[0]); 8335 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8336 struct sk_msg, sk), 8337 si->dst_reg, si->src_reg, 8338 offsetof(struct sk_msg, sk)); 8339 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8340 offsetof(struct sock_common, 8341 skc_v6_rcv_saddr.s6_addr32[0]) + 8342 off); 8343 #else 8344 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 8345 #endif 8346 break; 8347 8348 case offsetof(struct sk_msg_md, remote_port): 8349 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); 8350 8351 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8352 struct sk_msg, sk), 8353 si->dst_reg, si->src_reg, 8354 offsetof(struct sk_msg, sk)); 8355 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8356 offsetof(struct sock_common, skc_dport)); 8357 #ifndef __BIG_ENDIAN_BITFIELD 8358 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 8359 #endif 8360 break; 8361 8362 case offsetof(struct sk_msg_md, local_port): 8363 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); 8364 8365 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8366 struct sk_msg, sk), 8367 si->dst_reg, si->src_reg, 8368 offsetof(struct sk_msg, sk)); 8369 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8370 offsetof(struct sock_common, skc_num)); 8371 break; 8372 8373 case offsetof(struct sk_msg_md, size): 8374 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_sg, size), 8375 si->dst_reg, si->src_reg, 8376 offsetof(struct sk_msg_sg, size)); 8377 break; 8378 } 8379 8380 return insn - insn_buf; 8381 } 8382 8383 const struct bpf_verifier_ops sk_filter_verifier_ops = { 8384 .get_func_proto = sk_filter_func_proto, 8385 .is_valid_access = sk_filter_is_valid_access, 8386 .convert_ctx_access = bpf_convert_ctx_access, 8387 .gen_ld_abs = bpf_gen_ld_abs, 8388 }; 8389 8390 const struct bpf_prog_ops sk_filter_prog_ops = { 8391 .test_run = bpf_prog_test_run_skb, 8392 }; 8393 8394 const struct bpf_verifier_ops tc_cls_act_verifier_ops = { 8395 .get_func_proto = tc_cls_act_func_proto, 8396 .is_valid_access = tc_cls_act_is_valid_access, 8397 .convert_ctx_access = tc_cls_act_convert_ctx_access, 8398 .gen_prologue = tc_cls_act_prologue, 8399 .gen_ld_abs = bpf_gen_ld_abs, 8400 }; 8401 8402 const struct bpf_prog_ops tc_cls_act_prog_ops = { 8403 .test_run = bpf_prog_test_run_skb, 8404 }; 8405 8406 const struct bpf_verifier_ops xdp_verifier_ops = { 8407 .get_func_proto = xdp_func_proto, 8408 .is_valid_access = xdp_is_valid_access, 8409 .convert_ctx_access = xdp_convert_ctx_access, 8410 .gen_prologue = bpf_noop_prologue, 8411 }; 8412 8413 const struct bpf_prog_ops xdp_prog_ops = { 8414 .test_run = bpf_prog_test_run_xdp, 8415 }; 8416 8417 const struct bpf_verifier_ops cg_skb_verifier_ops = { 8418 .get_func_proto = cg_skb_func_proto, 8419 .is_valid_access = cg_skb_is_valid_access, 8420 .convert_ctx_access = bpf_convert_ctx_access, 8421 }; 8422 8423 const struct bpf_prog_ops cg_skb_prog_ops = { 8424 .test_run = bpf_prog_test_run_skb, 8425 }; 8426 8427 const struct bpf_verifier_ops lwt_in_verifier_ops = { 8428 .get_func_proto = lwt_in_func_proto, 8429 .is_valid_access = lwt_is_valid_access, 8430 .convert_ctx_access = bpf_convert_ctx_access, 8431 }; 8432 8433 const struct bpf_prog_ops lwt_in_prog_ops = { 8434 .test_run = bpf_prog_test_run_skb, 8435 }; 8436 8437 const struct bpf_verifier_ops lwt_out_verifier_ops = { 8438 .get_func_proto = lwt_out_func_proto, 8439 .is_valid_access = lwt_is_valid_access, 8440 .convert_ctx_access = bpf_convert_ctx_access, 8441 }; 8442 8443 const struct bpf_prog_ops lwt_out_prog_ops = { 8444 .test_run = bpf_prog_test_run_skb, 8445 }; 8446 8447 const struct bpf_verifier_ops lwt_xmit_verifier_ops = { 8448 .get_func_proto = lwt_xmit_func_proto, 8449 .is_valid_access = lwt_is_valid_access, 8450 .convert_ctx_access = bpf_convert_ctx_access, 8451 .gen_prologue = tc_cls_act_prologue, 8452 }; 8453 8454 const struct bpf_prog_ops lwt_xmit_prog_ops = { 8455 .test_run = bpf_prog_test_run_skb, 8456 }; 8457 8458 const struct bpf_verifier_ops lwt_seg6local_verifier_ops = { 8459 .get_func_proto = lwt_seg6local_func_proto, 8460 .is_valid_access = lwt_is_valid_access, 8461 .convert_ctx_access = bpf_convert_ctx_access, 8462 }; 8463 8464 const struct bpf_prog_ops lwt_seg6local_prog_ops = { 8465 .test_run = bpf_prog_test_run_skb, 8466 }; 8467 8468 const struct bpf_verifier_ops cg_sock_verifier_ops = { 8469 .get_func_proto = sock_filter_func_proto, 8470 .is_valid_access = sock_filter_is_valid_access, 8471 .convert_ctx_access = bpf_sock_convert_ctx_access, 8472 }; 8473 8474 const struct bpf_prog_ops cg_sock_prog_ops = { 8475 }; 8476 8477 const struct bpf_verifier_ops cg_sock_addr_verifier_ops = { 8478 .get_func_proto = sock_addr_func_proto, 8479 .is_valid_access = sock_addr_is_valid_access, 8480 .convert_ctx_access = sock_addr_convert_ctx_access, 8481 }; 8482 8483 const struct bpf_prog_ops cg_sock_addr_prog_ops = { 8484 }; 8485 8486 const struct bpf_verifier_ops sock_ops_verifier_ops = { 8487 .get_func_proto = sock_ops_func_proto, 8488 .is_valid_access = sock_ops_is_valid_access, 8489 .convert_ctx_access = sock_ops_convert_ctx_access, 8490 }; 8491 8492 const struct bpf_prog_ops sock_ops_prog_ops = { 8493 }; 8494 8495 const struct bpf_verifier_ops sk_skb_verifier_ops = { 8496 .get_func_proto = sk_skb_func_proto, 8497 .is_valid_access = sk_skb_is_valid_access, 8498 .convert_ctx_access = sk_skb_convert_ctx_access, 8499 .gen_prologue = sk_skb_prologue, 8500 }; 8501 8502 const struct bpf_prog_ops sk_skb_prog_ops = { 8503 }; 8504 8505 const struct bpf_verifier_ops sk_msg_verifier_ops = { 8506 .get_func_proto = sk_msg_func_proto, 8507 .is_valid_access = sk_msg_is_valid_access, 8508 .convert_ctx_access = sk_msg_convert_ctx_access, 8509 .gen_prologue = bpf_noop_prologue, 8510 }; 8511 8512 const struct bpf_prog_ops sk_msg_prog_ops = { 8513 }; 8514 8515 const struct bpf_verifier_ops flow_dissector_verifier_ops = { 8516 .get_func_proto = flow_dissector_func_proto, 8517 .is_valid_access = flow_dissector_is_valid_access, 8518 .convert_ctx_access = flow_dissector_convert_ctx_access, 8519 }; 8520 8521 const struct bpf_prog_ops flow_dissector_prog_ops = { 8522 .test_run = bpf_prog_test_run_flow_dissector, 8523 }; 8524 8525 int sk_detach_filter(struct sock *sk) 8526 { 8527 int ret = -ENOENT; 8528 struct sk_filter *filter; 8529 8530 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 8531 return -EPERM; 8532 8533 filter = rcu_dereference_protected(sk->sk_filter, 8534 lockdep_sock_is_held(sk)); 8535 if (filter) { 8536 RCU_INIT_POINTER(sk->sk_filter, NULL); 8537 sk_filter_uncharge(sk, filter); 8538 ret = 0; 8539 } 8540 8541 return ret; 8542 } 8543 EXPORT_SYMBOL_GPL(sk_detach_filter); 8544 8545 int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf, 8546 unsigned int len) 8547 { 8548 struct sock_fprog_kern *fprog; 8549 struct sk_filter *filter; 8550 int ret = 0; 8551 8552 lock_sock(sk); 8553 filter = rcu_dereference_protected(sk->sk_filter, 8554 lockdep_sock_is_held(sk)); 8555 if (!filter) 8556 goto out; 8557 8558 /* We're copying the filter that has been originally attached, 8559 * so no conversion/decode needed anymore. eBPF programs that 8560 * have no original program cannot be dumped through this. 8561 */ 8562 ret = -EACCES; 8563 fprog = filter->prog->orig_prog; 8564 if (!fprog) 8565 goto out; 8566 8567 ret = fprog->len; 8568 if (!len) 8569 /* User space only enquires number of filter blocks. */ 8570 goto out; 8571 8572 ret = -EINVAL; 8573 if (len < fprog->len) 8574 goto out; 8575 8576 ret = -EFAULT; 8577 if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog))) 8578 goto out; 8579 8580 /* Instead of bytes, the API requests to return the number 8581 * of filter blocks. 8582 */ 8583 ret = fprog->len; 8584 out: 8585 release_sock(sk); 8586 return ret; 8587 } 8588 8589 #ifdef CONFIG_INET 8590 static void bpf_init_reuseport_kern(struct sk_reuseport_kern *reuse_kern, 8591 struct sock_reuseport *reuse, 8592 struct sock *sk, struct sk_buff *skb, 8593 u32 hash) 8594 { 8595 reuse_kern->skb = skb; 8596 reuse_kern->sk = sk; 8597 reuse_kern->selected_sk = NULL; 8598 reuse_kern->data_end = skb->data + skb_headlen(skb); 8599 reuse_kern->hash = hash; 8600 reuse_kern->reuseport_id = reuse->reuseport_id; 8601 reuse_kern->bind_inany = reuse->bind_inany; 8602 } 8603 8604 struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk, 8605 struct bpf_prog *prog, struct sk_buff *skb, 8606 u32 hash) 8607 { 8608 struct sk_reuseport_kern reuse_kern; 8609 enum sk_action action; 8610 8611 bpf_init_reuseport_kern(&reuse_kern, reuse, sk, skb, hash); 8612 action = BPF_PROG_RUN(prog, &reuse_kern); 8613 8614 if (action == SK_PASS) 8615 return reuse_kern.selected_sk; 8616 else 8617 return ERR_PTR(-ECONNREFUSED); 8618 } 8619 8620 BPF_CALL_4(sk_select_reuseport, struct sk_reuseport_kern *, reuse_kern, 8621 struct bpf_map *, map, void *, key, u32, flags) 8622 { 8623 struct sock_reuseport *reuse; 8624 struct sock *selected_sk; 8625 8626 selected_sk = map->ops->map_lookup_elem(map, key); 8627 if (!selected_sk) 8628 return -ENOENT; 8629 8630 reuse = rcu_dereference(selected_sk->sk_reuseport_cb); 8631 if (!reuse) 8632 /* selected_sk is unhashed (e.g. by close()) after the 8633 * above map_lookup_elem(). Treat selected_sk has already 8634 * been removed from the map. 8635 */ 8636 return -ENOENT; 8637 8638 if (unlikely(reuse->reuseport_id != reuse_kern->reuseport_id)) { 8639 struct sock *sk; 8640 8641 if (unlikely(!reuse_kern->reuseport_id)) 8642 /* There is a small race between adding the 8643 * sk to the map and setting the 8644 * reuse_kern->reuseport_id. 8645 * Treat it as the sk has not been added to 8646 * the bpf map yet. 8647 */ 8648 return -ENOENT; 8649 8650 sk = reuse_kern->sk; 8651 if (sk->sk_protocol != selected_sk->sk_protocol) 8652 return -EPROTOTYPE; 8653 else if (sk->sk_family != selected_sk->sk_family) 8654 return -EAFNOSUPPORT; 8655 8656 /* Catch all. Likely bound to a different sockaddr. */ 8657 return -EBADFD; 8658 } 8659 8660 reuse_kern->selected_sk = selected_sk; 8661 8662 return 0; 8663 } 8664 8665 static const struct bpf_func_proto sk_select_reuseport_proto = { 8666 .func = sk_select_reuseport, 8667 .gpl_only = false, 8668 .ret_type = RET_INTEGER, 8669 .arg1_type = ARG_PTR_TO_CTX, 8670 .arg2_type = ARG_CONST_MAP_PTR, 8671 .arg3_type = ARG_PTR_TO_MAP_KEY, 8672 .arg4_type = ARG_ANYTHING, 8673 }; 8674 8675 BPF_CALL_4(sk_reuseport_load_bytes, 8676 const struct sk_reuseport_kern *, reuse_kern, u32, offset, 8677 void *, to, u32, len) 8678 { 8679 return ____bpf_skb_load_bytes(reuse_kern->skb, offset, to, len); 8680 } 8681 8682 static const struct bpf_func_proto sk_reuseport_load_bytes_proto = { 8683 .func = sk_reuseport_load_bytes, 8684 .gpl_only = false, 8685 .ret_type = RET_INTEGER, 8686 .arg1_type = ARG_PTR_TO_CTX, 8687 .arg2_type = ARG_ANYTHING, 8688 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 8689 .arg4_type = ARG_CONST_SIZE, 8690 }; 8691 8692 BPF_CALL_5(sk_reuseport_load_bytes_relative, 8693 const struct sk_reuseport_kern *, reuse_kern, u32, offset, 8694 void *, to, u32, len, u32, start_header) 8695 { 8696 return ____bpf_skb_load_bytes_relative(reuse_kern->skb, offset, to, 8697 len, start_header); 8698 } 8699 8700 static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto = { 8701 .func = sk_reuseport_load_bytes_relative, 8702 .gpl_only = false, 8703 .ret_type = RET_INTEGER, 8704 .arg1_type = ARG_PTR_TO_CTX, 8705 .arg2_type = ARG_ANYTHING, 8706 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 8707 .arg4_type = ARG_CONST_SIZE, 8708 .arg5_type = ARG_ANYTHING, 8709 }; 8710 8711 static const struct bpf_func_proto * 8712 sk_reuseport_func_proto(enum bpf_func_id func_id, 8713 const struct bpf_prog *prog) 8714 { 8715 switch (func_id) { 8716 case BPF_FUNC_sk_select_reuseport: 8717 return &sk_select_reuseport_proto; 8718 case BPF_FUNC_skb_load_bytes: 8719 return &sk_reuseport_load_bytes_proto; 8720 case BPF_FUNC_skb_load_bytes_relative: 8721 return &sk_reuseport_load_bytes_relative_proto; 8722 default: 8723 return bpf_base_func_proto(func_id); 8724 } 8725 } 8726 8727 static bool 8728 sk_reuseport_is_valid_access(int off, int size, 8729 enum bpf_access_type type, 8730 const struct bpf_prog *prog, 8731 struct bpf_insn_access_aux *info) 8732 { 8733 const u32 size_default = sizeof(__u32); 8734 8735 if (off < 0 || off >= sizeof(struct sk_reuseport_md) || 8736 off % size || type != BPF_READ) 8737 return false; 8738 8739 switch (off) { 8740 case offsetof(struct sk_reuseport_md, data): 8741 info->reg_type = PTR_TO_PACKET; 8742 return size == sizeof(__u64); 8743 8744 case offsetof(struct sk_reuseport_md, data_end): 8745 info->reg_type = PTR_TO_PACKET_END; 8746 return size == sizeof(__u64); 8747 8748 case offsetof(struct sk_reuseport_md, hash): 8749 return size == size_default; 8750 8751 /* Fields that allow narrowing */ 8752 case bpf_ctx_range(struct sk_reuseport_md, eth_protocol): 8753 if (size < sizeof_field(struct sk_buff, protocol)) 8754 return false; 8755 /* fall through */ 8756 case bpf_ctx_range(struct sk_reuseport_md, ip_protocol): 8757 case bpf_ctx_range(struct sk_reuseport_md, bind_inany): 8758 case bpf_ctx_range(struct sk_reuseport_md, len): 8759 bpf_ctx_record_field_size(info, size_default); 8760 return bpf_ctx_narrow_access_ok(off, size, size_default); 8761 8762 default: 8763 return false; 8764 } 8765 } 8766 8767 #define SK_REUSEPORT_LOAD_FIELD(F) ({ \ 8768 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \ 8769 si->dst_reg, si->src_reg, \ 8770 bpf_target_off(struct sk_reuseport_kern, F, \ 8771 sizeof_field(struct sk_reuseport_kern, F), \ 8772 target_size)); \ 8773 }) 8774 8775 #define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD) \ 8776 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \ 8777 struct sk_buff, \ 8778 skb, \ 8779 SKB_FIELD) 8780 8781 #define SK_REUSEPORT_LOAD_SK_FIELD(SK_FIELD) \ 8782 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \ 8783 struct sock, \ 8784 sk, \ 8785 SK_FIELD) 8786 8787 static u32 sk_reuseport_convert_ctx_access(enum bpf_access_type type, 8788 const struct bpf_insn *si, 8789 struct bpf_insn *insn_buf, 8790 struct bpf_prog *prog, 8791 u32 *target_size) 8792 { 8793 struct bpf_insn *insn = insn_buf; 8794 8795 switch (si->off) { 8796 case offsetof(struct sk_reuseport_md, data): 8797 SK_REUSEPORT_LOAD_SKB_FIELD(data); 8798 break; 8799 8800 case offsetof(struct sk_reuseport_md, len): 8801 SK_REUSEPORT_LOAD_SKB_FIELD(len); 8802 break; 8803 8804 case offsetof(struct sk_reuseport_md, eth_protocol): 8805 SK_REUSEPORT_LOAD_SKB_FIELD(protocol); 8806 break; 8807 8808 case offsetof(struct sk_reuseport_md, ip_protocol): 8809 SK_REUSEPORT_LOAD_SK_FIELD(sk_protocol); 8810 break; 8811 8812 case offsetof(struct sk_reuseport_md, data_end): 8813 SK_REUSEPORT_LOAD_FIELD(data_end); 8814 break; 8815 8816 case offsetof(struct sk_reuseport_md, hash): 8817 SK_REUSEPORT_LOAD_FIELD(hash); 8818 break; 8819 8820 case offsetof(struct sk_reuseport_md, bind_inany): 8821 SK_REUSEPORT_LOAD_FIELD(bind_inany); 8822 break; 8823 } 8824 8825 return insn - insn_buf; 8826 } 8827 8828 const struct bpf_verifier_ops sk_reuseport_verifier_ops = { 8829 .get_func_proto = sk_reuseport_func_proto, 8830 .is_valid_access = sk_reuseport_is_valid_access, 8831 .convert_ctx_access = sk_reuseport_convert_ctx_access, 8832 }; 8833 8834 const struct bpf_prog_ops sk_reuseport_prog_ops = { 8835 }; 8836 #endif /* CONFIG_INET */ 8837 8838 DEFINE_BPF_DISPATCHER(bpf_dispatcher_xdp) 8839 8840 void bpf_prog_change_xdp(struct bpf_prog *prev_prog, struct bpf_prog *prog) 8841 { 8842 bpf_dispatcher_change_prog(BPF_DISPATCHER_PTR(bpf_dispatcher_xdp), 8843 prev_prog, prog); 8844 } 8845