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(FIELD_SIZEOF(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(FIELD_SIZEOF(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(FIELD_SIZEOF(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(FIELD_SIZEOF(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(FIELD_SIZEOF(struct net_device, ifindex) != 4); 342 BUILD_BUG_ON(FIELD_SIZEOF(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(FIELD_SIZEOF(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(FIELD_SIZEOF(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 (IS_ERR(prog) && 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 2059 dev_xmit_recursion_inc(); 2060 ret = dev_queue_xmit(skb); 2061 dev_xmit_recursion_dec(); 2062 2063 return ret; 2064 } 2065 2066 static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev, 2067 u32 flags) 2068 { 2069 unsigned int mlen = skb_network_offset(skb); 2070 2071 if (mlen) { 2072 __skb_pull(skb, mlen); 2073 2074 /* At ingress, the mac header has already been pulled once. 2075 * At egress, skb_pospull_rcsum has to be done in case that 2076 * the skb is originated from ingress (i.e. a forwarded skb) 2077 * to ensure that rcsum starts at net header. 2078 */ 2079 if (!skb_at_tc_ingress(skb)) 2080 skb_postpull_rcsum(skb, skb_mac_header(skb), mlen); 2081 } 2082 skb_pop_mac_header(skb); 2083 skb_reset_mac_len(skb); 2084 return flags & BPF_F_INGRESS ? 2085 __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb); 2086 } 2087 2088 static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev, 2089 u32 flags) 2090 { 2091 /* Verify that a link layer header is carried */ 2092 if (unlikely(skb->mac_header >= skb->network_header)) { 2093 kfree_skb(skb); 2094 return -ERANGE; 2095 } 2096 2097 bpf_push_mac_rcsum(skb); 2098 return flags & BPF_F_INGRESS ? 2099 __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb); 2100 } 2101 2102 static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev, 2103 u32 flags) 2104 { 2105 if (dev_is_mac_header_xmit(dev)) 2106 return __bpf_redirect_common(skb, dev, flags); 2107 else 2108 return __bpf_redirect_no_mac(skb, dev, flags); 2109 } 2110 2111 BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags) 2112 { 2113 struct net_device *dev; 2114 struct sk_buff *clone; 2115 int ret; 2116 2117 if (unlikely(flags & ~(BPF_F_INGRESS))) 2118 return -EINVAL; 2119 2120 dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex); 2121 if (unlikely(!dev)) 2122 return -EINVAL; 2123 2124 clone = skb_clone(skb, GFP_ATOMIC); 2125 if (unlikely(!clone)) 2126 return -ENOMEM; 2127 2128 /* For direct write, we need to keep the invariant that the skbs 2129 * we're dealing with need to be uncloned. Should uncloning fail 2130 * here, we need to free the just generated clone to unclone once 2131 * again. 2132 */ 2133 ret = bpf_try_make_head_writable(skb); 2134 if (unlikely(ret)) { 2135 kfree_skb(clone); 2136 return -ENOMEM; 2137 } 2138 2139 return __bpf_redirect(clone, dev, flags); 2140 } 2141 2142 static const struct bpf_func_proto bpf_clone_redirect_proto = { 2143 .func = bpf_clone_redirect, 2144 .gpl_only = false, 2145 .ret_type = RET_INTEGER, 2146 .arg1_type = ARG_PTR_TO_CTX, 2147 .arg2_type = ARG_ANYTHING, 2148 .arg3_type = ARG_ANYTHING, 2149 }; 2150 2151 DEFINE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info); 2152 EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info); 2153 2154 BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags) 2155 { 2156 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2157 2158 if (unlikely(flags & ~(BPF_F_INGRESS))) 2159 return TC_ACT_SHOT; 2160 2161 ri->flags = flags; 2162 ri->tgt_index = ifindex; 2163 2164 return TC_ACT_REDIRECT; 2165 } 2166 2167 int skb_do_redirect(struct sk_buff *skb) 2168 { 2169 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2170 struct net_device *dev; 2171 2172 dev = dev_get_by_index_rcu(dev_net(skb->dev), ri->tgt_index); 2173 ri->tgt_index = 0; 2174 if (unlikely(!dev)) { 2175 kfree_skb(skb); 2176 return -EINVAL; 2177 } 2178 2179 return __bpf_redirect(skb, dev, ri->flags); 2180 } 2181 2182 static const struct bpf_func_proto bpf_redirect_proto = { 2183 .func = bpf_redirect, 2184 .gpl_only = false, 2185 .ret_type = RET_INTEGER, 2186 .arg1_type = ARG_ANYTHING, 2187 .arg2_type = ARG_ANYTHING, 2188 }; 2189 2190 BPF_CALL_2(bpf_msg_apply_bytes, struct sk_msg *, msg, u32, bytes) 2191 { 2192 msg->apply_bytes = bytes; 2193 return 0; 2194 } 2195 2196 static const struct bpf_func_proto bpf_msg_apply_bytes_proto = { 2197 .func = bpf_msg_apply_bytes, 2198 .gpl_only = false, 2199 .ret_type = RET_INTEGER, 2200 .arg1_type = ARG_PTR_TO_CTX, 2201 .arg2_type = ARG_ANYTHING, 2202 }; 2203 2204 BPF_CALL_2(bpf_msg_cork_bytes, struct sk_msg *, msg, u32, bytes) 2205 { 2206 msg->cork_bytes = bytes; 2207 return 0; 2208 } 2209 2210 static const struct bpf_func_proto bpf_msg_cork_bytes_proto = { 2211 .func = bpf_msg_cork_bytes, 2212 .gpl_only = false, 2213 .ret_type = RET_INTEGER, 2214 .arg1_type = ARG_PTR_TO_CTX, 2215 .arg2_type = ARG_ANYTHING, 2216 }; 2217 2218 BPF_CALL_4(bpf_msg_pull_data, struct sk_msg *, msg, u32, start, 2219 u32, end, u64, flags) 2220 { 2221 u32 len = 0, offset = 0, copy = 0, poffset = 0, bytes = end - start; 2222 u32 first_sge, last_sge, i, shift, bytes_sg_total; 2223 struct scatterlist *sge; 2224 u8 *raw, *to, *from; 2225 struct page *page; 2226 2227 if (unlikely(flags || end <= start)) 2228 return -EINVAL; 2229 2230 /* First find the starting scatterlist element */ 2231 i = msg->sg.start; 2232 do { 2233 len = sk_msg_elem(msg, i)->length; 2234 if (start < offset + len) 2235 break; 2236 offset += len; 2237 sk_msg_iter_var_next(i); 2238 } while (i != msg->sg.end); 2239 2240 if (unlikely(start >= offset + len)) 2241 return -EINVAL; 2242 2243 first_sge = i; 2244 /* The start may point into the sg element so we need to also 2245 * account for the headroom. 2246 */ 2247 bytes_sg_total = start - offset + bytes; 2248 if (!msg->sg.copy[i] && bytes_sg_total <= len) 2249 goto out; 2250 2251 /* At this point we need to linearize multiple scatterlist 2252 * elements or a single shared page. Either way we need to 2253 * copy into a linear buffer exclusively owned by BPF. Then 2254 * place the buffer in the scatterlist and fixup the original 2255 * entries by removing the entries now in the linear buffer 2256 * and shifting the remaining entries. For now we do not try 2257 * to copy partial entries to avoid complexity of running out 2258 * of sg_entry slots. The downside is reading a single byte 2259 * will copy the entire sg entry. 2260 */ 2261 do { 2262 copy += sk_msg_elem(msg, i)->length; 2263 sk_msg_iter_var_next(i); 2264 if (bytes_sg_total <= copy) 2265 break; 2266 } while (i != msg->sg.end); 2267 last_sge = i; 2268 2269 if (unlikely(bytes_sg_total > copy)) 2270 return -EINVAL; 2271 2272 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, 2273 get_order(copy)); 2274 if (unlikely(!page)) 2275 return -ENOMEM; 2276 2277 raw = page_address(page); 2278 i = first_sge; 2279 do { 2280 sge = sk_msg_elem(msg, i); 2281 from = sg_virt(sge); 2282 len = sge->length; 2283 to = raw + poffset; 2284 2285 memcpy(to, from, len); 2286 poffset += len; 2287 sge->length = 0; 2288 put_page(sg_page(sge)); 2289 2290 sk_msg_iter_var_next(i); 2291 } while (i != last_sge); 2292 2293 sg_set_page(&msg->sg.data[first_sge], page, copy, 0); 2294 2295 /* To repair sg ring we need to shift entries. If we only 2296 * had a single entry though we can just replace it and 2297 * be done. Otherwise walk the ring and shift the entries. 2298 */ 2299 WARN_ON_ONCE(last_sge == first_sge); 2300 shift = last_sge > first_sge ? 2301 last_sge - first_sge - 1 : 2302 MAX_SKB_FRAGS - first_sge + last_sge - 1; 2303 if (!shift) 2304 goto out; 2305 2306 i = first_sge; 2307 sk_msg_iter_var_next(i); 2308 do { 2309 u32 move_from; 2310 2311 if (i + shift >= MAX_MSG_FRAGS) 2312 move_from = i + shift - MAX_MSG_FRAGS; 2313 else 2314 move_from = i + shift; 2315 if (move_from == msg->sg.end) 2316 break; 2317 2318 msg->sg.data[i] = msg->sg.data[move_from]; 2319 msg->sg.data[move_from].length = 0; 2320 msg->sg.data[move_from].page_link = 0; 2321 msg->sg.data[move_from].offset = 0; 2322 sk_msg_iter_var_next(i); 2323 } while (1); 2324 2325 msg->sg.end = msg->sg.end - shift > msg->sg.end ? 2326 msg->sg.end - shift + MAX_MSG_FRAGS : 2327 msg->sg.end - shift; 2328 out: 2329 msg->data = sg_virt(&msg->sg.data[first_sge]) + start - offset; 2330 msg->data_end = msg->data + bytes; 2331 return 0; 2332 } 2333 2334 static const struct bpf_func_proto bpf_msg_pull_data_proto = { 2335 .func = bpf_msg_pull_data, 2336 .gpl_only = false, 2337 .ret_type = RET_INTEGER, 2338 .arg1_type = ARG_PTR_TO_CTX, 2339 .arg2_type = ARG_ANYTHING, 2340 .arg3_type = ARG_ANYTHING, 2341 .arg4_type = ARG_ANYTHING, 2342 }; 2343 2344 BPF_CALL_4(bpf_msg_push_data, struct sk_msg *, msg, u32, start, 2345 u32, len, u64, flags) 2346 { 2347 struct scatterlist sge, nsge, nnsge, rsge = {0}, *psge; 2348 u32 new, i = 0, l, space, copy = 0, offset = 0; 2349 u8 *raw, *to, *from; 2350 struct page *page; 2351 2352 if (unlikely(flags)) 2353 return -EINVAL; 2354 2355 /* First find the starting scatterlist element */ 2356 i = msg->sg.start; 2357 do { 2358 l = sk_msg_elem(msg, i)->length; 2359 2360 if (start < offset + l) 2361 break; 2362 offset += l; 2363 sk_msg_iter_var_next(i); 2364 } while (i != msg->sg.end); 2365 2366 if (start >= offset + l) 2367 return -EINVAL; 2368 2369 space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); 2370 2371 /* If no space available will fallback to copy, we need at 2372 * least one scatterlist elem available to push data into 2373 * when start aligns to the beginning of an element or two 2374 * when it falls inside an element. We handle the start equals 2375 * offset case because its the common case for inserting a 2376 * header. 2377 */ 2378 if (!space || (space == 1 && start != offset)) 2379 copy = msg->sg.data[i].length; 2380 2381 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, 2382 get_order(copy + len)); 2383 if (unlikely(!page)) 2384 return -ENOMEM; 2385 2386 if (copy) { 2387 int front, back; 2388 2389 raw = page_address(page); 2390 2391 psge = sk_msg_elem(msg, i); 2392 front = start - offset; 2393 back = psge->length - front; 2394 from = sg_virt(psge); 2395 2396 if (front) 2397 memcpy(raw, from, front); 2398 2399 if (back) { 2400 from += front; 2401 to = raw + front + len; 2402 2403 memcpy(to, from, back); 2404 } 2405 2406 put_page(sg_page(psge)); 2407 } else if (start - offset) { 2408 psge = sk_msg_elem(msg, i); 2409 rsge = sk_msg_elem_cpy(msg, i); 2410 2411 psge->length = start - offset; 2412 rsge.length -= psge->length; 2413 rsge.offset += start; 2414 2415 sk_msg_iter_var_next(i); 2416 sg_unmark_end(psge); 2417 sk_msg_iter_next(msg, end); 2418 } 2419 2420 /* Slot(s) to place newly allocated data */ 2421 new = i; 2422 2423 /* Shift one or two slots as needed */ 2424 if (!copy) { 2425 sge = sk_msg_elem_cpy(msg, i); 2426 2427 sk_msg_iter_var_next(i); 2428 sg_unmark_end(&sge); 2429 sk_msg_iter_next(msg, end); 2430 2431 nsge = sk_msg_elem_cpy(msg, i); 2432 if (rsge.length) { 2433 sk_msg_iter_var_next(i); 2434 nnsge = sk_msg_elem_cpy(msg, i); 2435 } 2436 2437 while (i != msg->sg.end) { 2438 msg->sg.data[i] = sge; 2439 sge = nsge; 2440 sk_msg_iter_var_next(i); 2441 if (rsge.length) { 2442 nsge = nnsge; 2443 nnsge = sk_msg_elem_cpy(msg, i); 2444 } else { 2445 nsge = sk_msg_elem_cpy(msg, i); 2446 } 2447 } 2448 } 2449 2450 /* Place newly allocated data buffer */ 2451 sk_mem_charge(msg->sk, len); 2452 msg->sg.size += len; 2453 msg->sg.copy[new] = false; 2454 sg_set_page(&msg->sg.data[new], page, len + copy, 0); 2455 if (rsge.length) { 2456 get_page(sg_page(&rsge)); 2457 sk_msg_iter_var_next(new); 2458 msg->sg.data[new] = rsge; 2459 } 2460 2461 sk_msg_compute_data_pointers(msg); 2462 return 0; 2463 } 2464 2465 static const struct bpf_func_proto bpf_msg_push_data_proto = { 2466 .func = bpf_msg_push_data, 2467 .gpl_only = false, 2468 .ret_type = RET_INTEGER, 2469 .arg1_type = ARG_PTR_TO_CTX, 2470 .arg2_type = ARG_ANYTHING, 2471 .arg3_type = ARG_ANYTHING, 2472 .arg4_type = ARG_ANYTHING, 2473 }; 2474 2475 static void sk_msg_shift_left(struct sk_msg *msg, int i) 2476 { 2477 int prev; 2478 2479 do { 2480 prev = i; 2481 sk_msg_iter_var_next(i); 2482 msg->sg.data[prev] = msg->sg.data[i]; 2483 } while (i != msg->sg.end); 2484 2485 sk_msg_iter_prev(msg, end); 2486 } 2487 2488 static void sk_msg_shift_right(struct sk_msg *msg, int i) 2489 { 2490 struct scatterlist tmp, sge; 2491 2492 sk_msg_iter_next(msg, end); 2493 sge = sk_msg_elem_cpy(msg, i); 2494 sk_msg_iter_var_next(i); 2495 tmp = sk_msg_elem_cpy(msg, i); 2496 2497 while (i != msg->sg.end) { 2498 msg->sg.data[i] = sge; 2499 sk_msg_iter_var_next(i); 2500 sge = tmp; 2501 tmp = sk_msg_elem_cpy(msg, i); 2502 } 2503 } 2504 2505 BPF_CALL_4(bpf_msg_pop_data, struct sk_msg *, msg, u32, start, 2506 u32, len, u64, flags) 2507 { 2508 u32 i = 0, l, space, offset = 0; 2509 u64 last = start + len; 2510 int pop; 2511 2512 if (unlikely(flags)) 2513 return -EINVAL; 2514 2515 /* First find the starting scatterlist element */ 2516 i = msg->sg.start; 2517 do { 2518 l = sk_msg_elem(msg, i)->length; 2519 2520 if (start < offset + l) 2521 break; 2522 offset += l; 2523 sk_msg_iter_var_next(i); 2524 } while (i != msg->sg.end); 2525 2526 /* Bounds checks: start and pop must be inside message */ 2527 if (start >= offset + l || last >= msg->sg.size) 2528 return -EINVAL; 2529 2530 space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); 2531 2532 pop = len; 2533 /* --------------| offset 2534 * -| start |-------- len -------| 2535 * 2536 * |----- a ----|-------- pop -------|----- b ----| 2537 * |______________________________________________| length 2538 * 2539 * 2540 * a: region at front of scatter element to save 2541 * b: region at back of scatter element to save when length > A + pop 2542 * pop: region to pop from element, same as input 'pop' here will be 2543 * decremented below per iteration. 2544 * 2545 * Two top-level cases to handle when start != offset, first B is non 2546 * zero and second B is zero corresponding to when a pop includes more 2547 * than one element. 2548 * 2549 * Then if B is non-zero AND there is no space allocate space and 2550 * compact A, B regions into page. If there is space shift ring to 2551 * the rigth free'ing the next element in ring to place B, leaving 2552 * A untouched except to reduce length. 2553 */ 2554 if (start != offset) { 2555 struct scatterlist *nsge, *sge = sk_msg_elem(msg, i); 2556 int a = start; 2557 int b = sge->length - pop - a; 2558 2559 sk_msg_iter_var_next(i); 2560 2561 if (pop < sge->length - a) { 2562 if (space) { 2563 sge->length = a; 2564 sk_msg_shift_right(msg, i); 2565 nsge = sk_msg_elem(msg, i); 2566 get_page(sg_page(sge)); 2567 sg_set_page(nsge, 2568 sg_page(sge), 2569 b, sge->offset + pop + a); 2570 } else { 2571 struct page *page, *orig; 2572 u8 *to, *from; 2573 2574 page = alloc_pages(__GFP_NOWARN | 2575 __GFP_COMP | GFP_ATOMIC, 2576 get_order(a + b)); 2577 if (unlikely(!page)) 2578 return -ENOMEM; 2579 2580 sge->length = a; 2581 orig = sg_page(sge); 2582 from = sg_virt(sge); 2583 to = page_address(page); 2584 memcpy(to, from, a); 2585 memcpy(to + a, from + a + pop, b); 2586 sg_set_page(sge, page, a + b, 0); 2587 put_page(orig); 2588 } 2589 pop = 0; 2590 } else if (pop >= sge->length - a) { 2591 sge->length = a; 2592 pop -= (sge->length - a); 2593 } 2594 } 2595 2596 /* From above the current layout _must_ be as follows, 2597 * 2598 * -| offset 2599 * -| start 2600 * 2601 * |---- pop ---|---------------- b ------------| 2602 * |____________________________________________| length 2603 * 2604 * Offset and start of the current msg elem are equal because in the 2605 * previous case we handled offset != start and either consumed the 2606 * entire element and advanced to the next element OR pop == 0. 2607 * 2608 * Two cases to handle here are first pop is less than the length 2609 * leaving some remainder b above. Simply adjust the element's layout 2610 * in this case. Or pop >= length of the element so that b = 0. In this 2611 * case advance to next element decrementing pop. 2612 */ 2613 while (pop) { 2614 struct scatterlist *sge = sk_msg_elem(msg, i); 2615 2616 if (pop < sge->length) { 2617 sge->length -= pop; 2618 sge->offset += pop; 2619 pop = 0; 2620 } else { 2621 pop -= sge->length; 2622 sk_msg_shift_left(msg, i); 2623 } 2624 sk_msg_iter_var_next(i); 2625 } 2626 2627 sk_mem_uncharge(msg->sk, len - pop); 2628 msg->sg.size -= (len - pop); 2629 sk_msg_compute_data_pointers(msg); 2630 return 0; 2631 } 2632 2633 static const struct bpf_func_proto bpf_msg_pop_data_proto = { 2634 .func = bpf_msg_pop_data, 2635 .gpl_only = false, 2636 .ret_type = RET_INTEGER, 2637 .arg1_type = ARG_PTR_TO_CTX, 2638 .arg2_type = ARG_ANYTHING, 2639 .arg3_type = ARG_ANYTHING, 2640 .arg4_type = ARG_ANYTHING, 2641 }; 2642 2643 BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb) 2644 { 2645 return task_get_classid(skb); 2646 } 2647 2648 static const struct bpf_func_proto bpf_get_cgroup_classid_proto = { 2649 .func = bpf_get_cgroup_classid, 2650 .gpl_only = false, 2651 .ret_type = RET_INTEGER, 2652 .arg1_type = ARG_PTR_TO_CTX, 2653 }; 2654 2655 BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb) 2656 { 2657 return dst_tclassid(skb); 2658 } 2659 2660 static const struct bpf_func_proto bpf_get_route_realm_proto = { 2661 .func = bpf_get_route_realm, 2662 .gpl_only = false, 2663 .ret_type = RET_INTEGER, 2664 .arg1_type = ARG_PTR_TO_CTX, 2665 }; 2666 2667 BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb) 2668 { 2669 /* If skb_clear_hash() was called due to mangling, we can 2670 * trigger SW recalculation here. Later access to hash 2671 * can then use the inline skb->hash via context directly 2672 * instead of calling this helper again. 2673 */ 2674 return skb_get_hash(skb); 2675 } 2676 2677 static const struct bpf_func_proto bpf_get_hash_recalc_proto = { 2678 .func = bpf_get_hash_recalc, 2679 .gpl_only = false, 2680 .ret_type = RET_INTEGER, 2681 .arg1_type = ARG_PTR_TO_CTX, 2682 }; 2683 2684 BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb) 2685 { 2686 /* After all direct packet write, this can be used once for 2687 * triggering a lazy recalc on next skb_get_hash() invocation. 2688 */ 2689 skb_clear_hash(skb); 2690 return 0; 2691 } 2692 2693 static const struct bpf_func_proto bpf_set_hash_invalid_proto = { 2694 .func = bpf_set_hash_invalid, 2695 .gpl_only = false, 2696 .ret_type = RET_INTEGER, 2697 .arg1_type = ARG_PTR_TO_CTX, 2698 }; 2699 2700 BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash) 2701 { 2702 /* Set user specified hash as L4(+), so that it gets returned 2703 * on skb_get_hash() call unless BPF prog later on triggers a 2704 * skb_clear_hash(). 2705 */ 2706 __skb_set_sw_hash(skb, hash, true); 2707 return 0; 2708 } 2709 2710 static const struct bpf_func_proto bpf_set_hash_proto = { 2711 .func = bpf_set_hash, 2712 .gpl_only = false, 2713 .ret_type = RET_INTEGER, 2714 .arg1_type = ARG_PTR_TO_CTX, 2715 .arg2_type = ARG_ANYTHING, 2716 }; 2717 2718 BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto, 2719 u16, vlan_tci) 2720 { 2721 int ret; 2722 2723 if (unlikely(vlan_proto != htons(ETH_P_8021Q) && 2724 vlan_proto != htons(ETH_P_8021AD))) 2725 vlan_proto = htons(ETH_P_8021Q); 2726 2727 bpf_push_mac_rcsum(skb); 2728 ret = skb_vlan_push(skb, vlan_proto, vlan_tci); 2729 bpf_pull_mac_rcsum(skb); 2730 2731 bpf_compute_data_pointers(skb); 2732 return ret; 2733 } 2734 2735 static const struct bpf_func_proto bpf_skb_vlan_push_proto = { 2736 .func = bpf_skb_vlan_push, 2737 .gpl_only = false, 2738 .ret_type = RET_INTEGER, 2739 .arg1_type = ARG_PTR_TO_CTX, 2740 .arg2_type = ARG_ANYTHING, 2741 .arg3_type = ARG_ANYTHING, 2742 }; 2743 2744 BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb) 2745 { 2746 int ret; 2747 2748 bpf_push_mac_rcsum(skb); 2749 ret = skb_vlan_pop(skb); 2750 bpf_pull_mac_rcsum(skb); 2751 2752 bpf_compute_data_pointers(skb); 2753 return ret; 2754 } 2755 2756 static const struct bpf_func_proto bpf_skb_vlan_pop_proto = { 2757 .func = bpf_skb_vlan_pop, 2758 .gpl_only = false, 2759 .ret_type = RET_INTEGER, 2760 .arg1_type = ARG_PTR_TO_CTX, 2761 }; 2762 2763 static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len) 2764 { 2765 /* Caller already did skb_cow() with len as headroom, 2766 * so no need to do it here. 2767 */ 2768 skb_push(skb, len); 2769 memmove(skb->data, skb->data + len, off); 2770 memset(skb->data + off, 0, len); 2771 2772 /* No skb_postpush_rcsum(skb, skb->data + off, len) 2773 * needed here as it does not change the skb->csum 2774 * result for checksum complete when summing over 2775 * zeroed blocks. 2776 */ 2777 return 0; 2778 } 2779 2780 static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len) 2781 { 2782 /* skb_ensure_writable() is not needed here, as we're 2783 * already working on an uncloned skb. 2784 */ 2785 if (unlikely(!pskb_may_pull(skb, off + len))) 2786 return -ENOMEM; 2787 2788 skb_postpull_rcsum(skb, skb->data + off, len); 2789 memmove(skb->data + len, skb->data, off); 2790 __skb_pull(skb, len); 2791 2792 return 0; 2793 } 2794 2795 static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len) 2796 { 2797 bool trans_same = skb->transport_header == skb->network_header; 2798 int ret; 2799 2800 /* There's no need for __skb_push()/__skb_pull() pair to 2801 * get to the start of the mac header as we're guaranteed 2802 * to always start from here under eBPF. 2803 */ 2804 ret = bpf_skb_generic_push(skb, off, len); 2805 if (likely(!ret)) { 2806 skb->mac_header -= len; 2807 skb->network_header -= len; 2808 if (trans_same) 2809 skb->transport_header = skb->network_header; 2810 } 2811 2812 return ret; 2813 } 2814 2815 static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len) 2816 { 2817 bool trans_same = skb->transport_header == skb->network_header; 2818 int ret; 2819 2820 /* Same here, __skb_push()/__skb_pull() pair not needed. */ 2821 ret = bpf_skb_generic_pop(skb, off, len); 2822 if (likely(!ret)) { 2823 skb->mac_header += len; 2824 skb->network_header += len; 2825 if (trans_same) 2826 skb->transport_header = skb->network_header; 2827 } 2828 2829 return ret; 2830 } 2831 2832 static int bpf_skb_proto_4_to_6(struct sk_buff *skb) 2833 { 2834 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); 2835 u32 off = skb_mac_header_len(skb); 2836 int ret; 2837 2838 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) 2839 return -ENOTSUPP; 2840 2841 ret = skb_cow(skb, len_diff); 2842 if (unlikely(ret < 0)) 2843 return ret; 2844 2845 ret = bpf_skb_net_hdr_push(skb, off, len_diff); 2846 if (unlikely(ret < 0)) 2847 return ret; 2848 2849 if (skb_is_gso(skb)) { 2850 struct skb_shared_info *shinfo = skb_shinfo(skb); 2851 2852 /* SKB_GSO_TCPV4 needs to be changed into 2853 * SKB_GSO_TCPV6. 2854 */ 2855 if (shinfo->gso_type & SKB_GSO_TCPV4) { 2856 shinfo->gso_type &= ~SKB_GSO_TCPV4; 2857 shinfo->gso_type |= SKB_GSO_TCPV6; 2858 } 2859 2860 /* Due to IPv6 header, MSS needs to be downgraded. */ 2861 skb_decrease_gso_size(shinfo, len_diff); 2862 /* Header must be checked, and gso_segs recomputed. */ 2863 shinfo->gso_type |= SKB_GSO_DODGY; 2864 shinfo->gso_segs = 0; 2865 } 2866 2867 skb->protocol = htons(ETH_P_IPV6); 2868 skb_clear_hash(skb); 2869 2870 return 0; 2871 } 2872 2873 static int bpf_skb_proto_6_to_4(struct sk_buff *skb) 2874 { 2875 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); 2876 u32 off = skb_mac_header_len(skb); 2877 int ret; 2878 2879 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) 2880 return -ENOTSUPP; 2881 2882 ret = skb_unclone(skb, GFP_ATOMIC); 2883 if (unlikely(ret < 0)) 2884 return ret; 2885 2886 ret = bpf_skb_net_hdr_pop(skb, off, len_diff); 2887 if (unlikely(ret < 0)) 2888 return ret; 2889 2890 if (skb_is_gso(skb)) { 2891 struct skb_shared_info *shinfo = skb_shinfo(skb); 2892 2893 /* SKB_GSO_TCPV6 needs to be changed into 2894 * SKB_GSO_TCPV4. 2895 */ 2896 if (shinfo->gso_type & SKB_GSO_TCPV6) { 2897 shinfo->gso_type &= ~SKB_GSO_TCPV6; 2898 shinfo->gso_type |= SKB_GSO_TCPV4; 2899 } 2900 2901 /* Due to IPv4 header, MSS can be upgraded. */ 2902 skb_increase_gso_size(shinfo, len_diff); 2903 /* Header must be checked, and gso_segs recomputed. */ 2904 shinfo->gso_type |= SKB_GSO_DODGY; 2905 shinfo->gso_segs = 0; 2906 } 2907 2908 skb->protocol = htons(ETH_P_IP); 2909 skb_clear_hash(skb); 2910 2911 return 0; 2912 } 2913 2914 static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto) 2915 { 2916 __be16 from_proto = skb->protocol; 2917 2918 if (from_proto == htons(ETH_P_IP) && 2919 to_proto == htons(ETH_P_IPV6)) 2920 return bpf_skb_proto_4_to_6(skb); 2921 2922 if (from_proto == htons(ETH_P_IPV6) && 2923 to_proto == htons(ETH_P_IP)) 2924 return bpf_skb_proto_6_to_4(skb); 2925 2926 return -ENOTSUPP; 2927 } 2928 2929 BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto, 2930 u64, flags) 2931 { 2932 int ret; 2933 2934 if (unlikely(flags)) 2935 return -EINVAL; 2936 2937 /* General idea is that this helper does the basic groundwork 2938 * needed for changing the protocol, and eBPF program fills the 2939 * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace() 2940 * and other helpers, rather than passing a raw buffer here. 2941 * 2942 * The rationale is to keep this minimal and without a need to 2943 * deal with raw packet data. F.e. even if we would pass buffers 2944 * here, the program still needs to call the bpf_lX_csum_replace() 2945 * helpers anyway. Plus, this way we keep also separation of 2946 * concerns, since f.e. bpf_skb_store_bytes() should only take 2947 * care of stores. 2948 * 2949 * Currently, additional options and extension header space are 2950 * not supported, but flags register is reserved so we can adapt 2951 * that. For offloads, we mark packet as dodgy, so that headers 2952 * need to be verified first. 2953 */ 2954 ret = bpf_skb_proto_xlat(skb, proto); 2955 bpf_compute_data_pointers(skb); 2956 return ret; 2957 } 2958 2959 static const struct bpf_func_proto bpf_skb_change_proto_proto = { 2960 .func = bpf_skb_change_proto, 2961 .gpl_only = false, 2962 .ret_type = RET_INTEGER, 2963 .arg1_type = ARG_PTR_TO_CTX, 2964 .arg2_type = ARG_ANYTHING, 2965 .arg3_type = ARG_ANYTHING, 2966 }; 2967 2968 BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type) 2969 { 2970 /* We only allow a restricted subset to be changed for now. */ 2971 if (unlikely(!skb_pkt_type_ok(skb->pkt_type) || 2972 !skb_pkt_type_ok(pkt_type))) 2973 return -EINVAL; 2974 2975 skb->pkt_type = pkt_type; 2976 return 0; 2977 } 2978 2979 static const struct bpf_func_proto bpf_skb_change_type_proto = { 2980 .func = bpf_skb_change_type, 2981 .gpl_only = false, 2982 .ret_type = RET_INTEGER, 2983 .arg1_type = ARG_PTR_TO_CTX, 2984 .arg2_type = ARG_ANYTHING, 2985 }; 2986 2987 static u32 bpf_skb_net_base_len(const struct sk_buff *skb) 2988 { 2989 switch (skb->protocol) { 2990 case htons(ETH_P_IP): 2991 return sizeof(struct iphdr); 2992 case htons(ETH_P_IPV6): 2993 return sizeof(struct ipv6hdr); 2994 default: 2995 return ~0U; 2996 } 2997 } 2998 2999 #define BPF_F_ADJ_ROOM_ENCAP_L3_MASK (BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 | \ 3000 BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3001 3002 #define BPF_F_ADJ_ROOM_MASK (BPF_F_ADJ_ROOM_FIXED_GSO | \ 3003 BPF_F_ADJ_ROOM_ENCAP_L3_MASK | \ 3004 BPF_F_ADJ_ROOM_ENCAP_L4_GRE | \ 3005 BPF_F_ADJ_ROOM_ENCAP_L4_UDP | \ 3006 BPF_F_ADJ_ROOM_ENCAP_L2( \ 3007 BPF_ADJ_ROOM_ENCAP_L2_MASK)) 3008 3009 static int bpf_skb_net_grow(struct sk_buff *skb, u32 off, u32 len_diff, 3010 u64 flags) 3011 { 3012 u8 inner_mac_len = flags >> BPF_ADJ_ROOM_ENCAP_L2_SHIFT; 3013 bool encap = flags & BPF_F_ADJ_ROOM_ENCAP_L3_MASK; 3014 u16 mac_len = 0, inner_net = 0, inner_trans = 0; 3015 unsigned int gso_type = SKB_GSO_DODGY; 3016 int ret; 3017 3018 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { 3019 /* udp gso_size delineates datagrams, only allow if fixed */ 3020 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || 3021 !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3022 return -ENOTSUPP; 3023 } 3024 3025 ret = skb_cow_head(skb, len_diff); 3026 if (unlikely(ret < 0)) 3027 return ret; 3028 3029 if (encap) { 3030 if (skb->protocol != htons(ETH_P_IP) && 3031 skb->protocol != htons(ETH_P_IPV6)) 3032 return -ENOTSUPP; 3033 3034 if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 && 3035 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3036 return -EINVAL; 3037 3038 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE && 3039 flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) 3040 return -EINVAL; 3041 3042 if (skb->encapsulation) 3043 return -EALREADY; 3044 3045 mac_len = skb->network_header - skb->mac_header; 3046 inner_net = skb->network_header; 3047 if (inner_mac_len > len_diff) 3048 return -EINVAL; 3049 inner_trans = skb->transport_header; 3050 } 3051 3052 ret = bpf_skb_net_hdr_push(skb, off, len_diff); 3053 if (unlikely(ret < 0)) 3054 return ret; 3055 3056 if (encap) { 3057 skb->inner_mac_header = inner_net - inner_mac_len; 3058 skb->inner_network_header = inner_net; 3059 skb->inner_transport_header = inner_trans; 3060 skb_set_inner_protocol(skb, skb->protocol); 3061 3062 skb->encapsulation = 1; 3063 skb_set_network_header(skb, mac_len); 3064 3065 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) 3066 gso_type |= SKB_GSO_UDP_TUNNEL; 3067 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE) 3068 gso_type |= SKB_GSO_GRE; 3069 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3070 gso_type |= SKB_GSO_IPXIP6; 3071 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) 3072 gso_type |= SKB_GSO_IPXIP4; 3073 3074 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE || 3075 flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) { 3076 int nh_len = flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6 ? 3077 sizeof(struct ipv6hdr) : 3078 sizeof(struct iphdr); 3079 3080 skb_set_transport_header(skb, mac_len + nh_len); 3081 } 3082 3083 /* Match skb->protocol to new outer l3 protocol */ 3084 if (skb->protocol == htons(ETH_P_IP) && 3085 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3086 skb->protocol = htons(ETH_P_IPV6); 3087 else if (skb->protocol == htons(ETH_P_IPV6) && 3088 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) 3089 skb->protocol = htons(ETH_P_IP); 3090 } 3091 3092 if (skb_is_gso(skb)) { 3093 struct skb_shared_info *shinfo = skb_shinfo(skb); 3094 3095 /* Due to header grow, MSS needs to be downgraded. */ 3096 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3097 skb_decrease_gso_size(shinfo, len_diff); 3098 3099 /* Header must be checked, and gso_segs recomputed. */ 3100 shinfo->gso_type |= gso_type; 3101 shinfo->gso_segs = 0; 3102 } 3103 3104 return 0; 3105 } 3106 3107 static int bpf_skb_net_shrink(struct sk_buff *skb, u32 off, u32 len_diff, 3108 u64 flags) 3109 { 3110 int ret; 3111 3112 if (flags & ~BPF_F_ADJ_ROOM_FIXED_GSO) 3113 return -EINVAL; 3114 3115 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { 3116 /* udp gso_size delineates datagrams, only allow if fixed */ 3117 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || 3118 !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3119 return -ENOTSUPP; 3120 } 3121 3122 ret = skb_unclone(skb, GFP_ATOMIC); 3123 if (unlikely(ret < 0)) 3124 return ret; 3125 3126 ret = bpf_skb_net_hdr_pop(skb, off, len_diff); 3127 if (unlikely(ret < 0)) 3128 return ret; 3129 3130 if (skb_is_gso(skb)) { 3131 struct skb_shared_info *shinfo = skb_shinfo(skb); 3132 3133 /* Due to header shrink, MSS can be upgraded. */ 3134 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3135 skb_increase_gso_size(shinfo, len_diff); 3136 3137 /* Header must be checked, and gso_segs recomputed. */ 3138 shinfo->gso_type |= SKB_GSO_DODGY; 3139 shinfo->gso_segs = 0; 3140 } 3141 3142 return 0; 3143 } 3144 3145 static u32 __bpf_skb_max_len(const struct sk_buff *skb) 3146 { 3147 return skb->dev ? skb->dev->mtu + skb->dev->hard_header_len : 3148 SKB_MAX_ALLOC; 3149 } 3150 3151 BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, 3152 u32, mode, u64, flags) 3153 { 3154 u32 len_cur, len_diff_abs = abs(len_diff); 3155 u32 len_min = bpf_skb_net_base_len(skb); 3156 u32 len_max = __bpf_skb_max_len(skb); 3157 __be16 proto = skb->protocol; 3158 bool shrink = len_diff < 0; 3159 u32 off; 3160 int ret; 3161 3162 if (unlikely(flags & ~BPF_F_ADJ_ROOM_MASK)) 3163 return -EINVAL; 3164 if (unlikely(len_diff_abs > 0xfffU)) 3165 return -EFAULT; 3166 if (unlikely(proto != htons(ETH_P_IP) && 3167 proto != htons(ETH_P_IPV6))) 3168 return -ENOTSUPP; 3169 3170 off = skb_mac_header_len(skb); 3171 switch (mode) { 3172 case BPF_ADJ_ROOM_NET: 3173 off += bpf_skb_net_base_len(skb); 3174 break; 3175 case BPF_ADJ_ROOM_MAC: 3176 break; 3177 default: 3178 return -ENOTSUPP; 3179 } 3180 3181 len_cur = skb->len - skb_network_offset(skb); 3182 if ((shrink && (len_diff_abs >= len_cur || 3183 len_cur - len_diff_abs < len_min)) || 3184 (!shrink && (skb->len + len_diff_abs > len_max && 3185 !skb_is_gso(skb)))) 3186 return -ENOTSUPP; 3187 3188 ret = shrink ? bpf_skb_net_shrink(skb, off, len_diff_abs, flags) : 3189 bpf_skb_net_grow(skb, off, len_diff_abs, flags); 3190 3191 bpf_compute_data_pointers(skb); 3192 return ret; 3193 } 3194 3195 static const struct bpf_func_proto bpf_skb_adjust_room_proto = { 3196 .func = bpf_skb_adjust_room, 3197 .gpl_only = false, 3198 .ret_type = RET_INTEGER, 3199 .arg1_type = ARG_PTR_TO_CTX, 3200 .arg2_type = ARG_ANYTHING, 3201 .arg3_type = ARG_ANYTHING, 3202 .arg4_type = ARG_ANYTHING, 3203 }; 3204 3205 static u32 __bpf_skb_min_len(const struct sk_buff *skb) 3206 { 3207 u32 min_len = skb_network_offset(skb); 3208 3209 if (skb_transport_header_was_set(skb)) 3210 min_len = skb_transport_offset(skb); 3211 if (skb->ip_summed == CHECKSUM_PARTIAL) 3212 min_len = skb_checksum_start_offset(skb) + 3213 skb->csum_offset + sizeof(__sum16); 3214 return min_len; 3215 } 3216 3217 static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len) 3218 { 3219 unsigned int old_len = skb->len; 3220 int ret; 3221 3222 ret = __skb_grow_rcsum(skb, new_len); 3223 if (!ret) 3224 memset(skb->data + old_len, 0, new_len - old_len); 3225 return ret; 3226 } 3227 3228 static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len) 3229 { 3230 return __skb_trim_rcsum(skb, new_len); 3231 } 3232 3233 static inline int __bpf_skb_change_tail(struct sk_buff *skb, u32 new_len, 3234 u64 flags) 3235 { 3236 u32 max_len = __bpf_skb_max_len(skb); 3237 u32 min_len = __bpf_skb_min_len(skb); 3238 int ret; 3239 3240 if (unlikely(flags || new_len > max_len || new_len < min_len)) 3241 return -EINVAL; 3242 if (skb->encapsulation) 3243 return -ENOTSUPP; 3244 3245 /* The basic idea of this helper is that it's performing the 3246 * needed work to either grow or trim an skb, and eBPF program 3247 * rewrites the rest via helpers like bpf_skb_store_bytes(), 3248 * bpf_lX_csum_replace() and others rather than passing a raw 3249 * buffer here. This one is a slow path helper and intended 3250 * for replies with control messages. 3251 * 3252 * Like in bpf_skb_change_proto(), we want to keep this rather 3253 * minimal and without protocol specifics so that we are able 3254 * to separate concerns as in bpf_skb_store_bytes() should only 3255 * be the one responsible for writing buffers. 3256 * 3257 * It's really expected to be a slow path operation here for 3258 * control message replies, so we're implicitly linearizing, 3259 * uncloning and drop offloads from the skb by this. 3260 */ 3261 ret = __bpf_try_make_writable(skb, skb->len); 3262 if (!ret) { 3263 if (new_len > skb->len) 3264 ret = bpf_skb_grow_rcsum(skb, new_len); 3265 else if (new_len < skb->len) 3266 ret = bpf_skb_trim_rcsum(skb, new_len); 3267 if (!ret && skb_is_gso(skb)) 3268 skb_gso_reset(skb); 3269 } 3270 return ret; 3271 } 3272 3273 BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len, 3274 u64, flags) 3275 { 3276 int ret = __bpf_skb_change_tail(skb, new_len, flags); 3277 3278 bpf_compute_data_pointers(skb); 3279 return ret; 3280 } 3281 3282 static const struct bpf_func_proto bpf_skb_change_tail_proto = { 3283 .func = bpf_skb_change_tail, 3284 .gpl_only = false, 3285 .ret_type = RET_INTEGER, 3286 .arg1_type = ARG_PTR_TO_CTX, 3287 .arg2_type = ARG_ANYTHING, 3288 .arg3_type = ARG_ANYTHING, 3289 }; 3290 3291 BPF_CALL_3(sk_skb_change_tail, struct sk_buff *, skb, u32, new_len, 3292 u64, flags) 3293 { 3294 int ret = __bpf_skb_change_tail(skb, new_len, flags); 3295 3296 bpf_compute_data_end_sk_skb(skb); 3297 return ret; 3298 } 3299 3300 static const struct bpf_func_proto sk_skb_change_tail_proto = { 3301 .func = sk_skb_change_tail, 3302 .gpl_only = false, 3303 .ret_type = RET_INTEGER, 3304 .arg1_type = ARG_PTR_TO_CTX, 3305 .arg2_type = ARG_ANYTHING, 3306 .arg3_type = ARG_ANYTHING, 3307 }; 3308 3309 static inline int __bpf_skb_change_head(struct sk_buff *skb, u32 head_room, 3310 u64 flags) 3311 { 3312 u32 max_len = __bpf_skb_max_len(skb); 3313 u32 new_len = skb->len + head_room; 3314 int ret; 3315 3316 if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) || 3317 new_len < skb->len)) 3318 return -EINVAL; 3319 3320 ret = skb_cow(skb, head_room); 3321 if (likely(!ret)) { 3322 /* Idea for this helper is that we currently only 3323 * allow to expand on mac header. This means that 3324 * skb->protocol network header, etc, stay as is. 3325 * Compared to bpf_skb_change_tail(), we're more 3326 * flexible due to not needing to linearize or 3327 * reset GSO. Intention for this helper is to be 3328 * used by an L3 skb that needs to push mac header 3329 * for redirection into L2 device. 3330 */ 3331 __skb_push(skb, head_room); 3332 memset(skb->data, 0, head_room); 3333 skb_reset_mac_header(skb); 3334 } 3335 3336 return ret; 3337 } 3338 3339 BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room, 3340 u64, flags) 3341 { 3342 int ret = __bpf_skb_change_head(skb, head_room, flags); 3343 3344 bpf_compute_data_pointers(skb); 3345 return ret; 3346 } 3347 3348 static const struct bpf_func_proto bpf_skb_change_head_proto = { 3349 .func = bpf_skb_change_head, 3350 .gpl_only = false, 3351 .ret_type = RET_INTEGER, 3352 .arg1_type = ARG_PTR_TO_CTX, 3353 .arg2_type = ARG_ANYTHING, 3354 .arg3_type = ARG_ANYTHING, 3355 }; 3356 3357 BPF_CALL_3(sk_skb_change_head, struct sk_buff *, skb, u32, head_room, 3358 u64, flags) 3359 { 3360 int ret = __bpf_skb_change_head(skb, head_room, flags); 3361 3362 bpf_compute_data_end_sk_skb(skb); 3363 return ret; 3364 } 3365 3366 static const struct bpf_func_proto sk_skb_change_head_proto = { 3367 .func = sk_skb_change_head, 3368 .gpl_only = false, 3369 .ret_type = RET_INTEGER, 3370 .arg1_type = ARG_PTR_TO_CTX, 3371 .arg2_type = ARG_ANYTHING, 3372 .arg3_type = ARG_ANYTHING, 3373 }; 3374 static unsigned long xdp_get_metalen(const struct xdp_buff *xdp) 3375 { 3376 return xdp_data_meta_unsupported(xdp) ? 0 : 3377 xdp->data - xdp->data_meta; 3378 } 3379 3380 BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset) 3381 { 3382 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); 3383 unsigned long metalen = xdp_get_metalen(xdp); 3384 void *data_start = xdp_frame_end + metalen; 3385 void *data = xdp->data + offset; 3386 3387 if (unlikely(data < data_start || 3388 data > xdp->data_end - ETH_HLEN)) 3389 return -EINVAL; 3390 3391 if (metalen) 3392 memmove(xdp->data_meta + offset, 3393 xdp->data_meta, metalen); 3394 xdp->data_meta += offset; 3395 xdp->data = data; 3396 3397 return 0; 3398 } 3399 3400 static const struct bpf_func_proto bpf_xdp_adjust_head_proto = { 3401 .func = bpf_xdp_adjust_head, 3402 .gpl_only = false, 3403 .ret_type = RET_INTEGER, 3404 .arg1_type = ARG_PTR_TO_CTX, 3405 .arg2_type = ARG_ANYTHING, 3406 }; 3407 3408 BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset) 3409 { 3410 void *data_end = xdp->data_end + offset; 3411 3412 /* only shrinking is allowed for now. */ 3413 if (unlikely(offset >= 0)) 3414 return -EINVAL; 3415 3416 if (unlikely(data_end < xdp->data + ETH_HLEN)) 3417 return -EINVAL; 3418 3419 xdp->data_end = data_end; 3420 3421 return 0; 3422 } 3423 3424 static const struct bpf_func_proto bpf_xdp_adjust_tail_proto = { 3425 .func = bpf_xdp_adjust_tail, 3426 .gpl_only = false, 3427 .ret_type = RET_INTEGER, 3428 .arg1_type = ARG_PTR_TO_CTX, 3429 .arg2_type = ARG_ANYTHING, 3430 }; 3431 3432 BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset) 3433 { 3434 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); 3435 void *meta = xdp->data_meta + offset; 3436 unsigned long metalen = xdp->data - meta; 3437 3438 if (xdp_data_meta_unsupported(xdp)) 3439 return -ENOTSUPP; 3440 if (unlikely(meta < xdp_frame_end || 3441 meta > xdp->data)) 3442 return -EINVAL; 3443 if (unlikely((metalen & (sizeof(__u32) - 1)) || 3444 (metalen > 32))) 3445 return -EACCES; 3446 3447 xdp->data_meta = meta; 3448 3449 return 0; 3450 } 3451 3452 static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = { 3453 .func = bpf_xdp_adjust_meta, 3454 .gpl_only = false, 3455 .ret_type = RET_INTEGER, 3456 .arg1_type = ARG_PTR_TO_CTX, 3457 .arg2_type = ARG_ANYTHING, 3458 }; 3459 3460 static int __bpf_tx_xdp(struct net_device *dev, 3461 struct bpf_map *map, 3462 struct xdp_buff *xdp, 3463 u32 index) 3464 { 3465 struct xdp_frame *xdpf; 3466 int err, sent; 3467 3468 if (!dev->netdev_ops->ndo_xdp_xmit) { 3469 return -EOPNOTSUPP; 3470 } 3471 3472 err = xdp_ok_fwd_dev(dev, xdp->data_end - xdp->data); 3473 if (unlikely(err)) 3474 return err; 3475 3476 xdpf = convert_to_xdp_frame(xdp); 3477 if (unlikely(!xdpf)) 3478 return -EOVERFLOW; 3479 3480 sent = dev->netdev_ops->ndo_xdp_xmit(dev, 1, &xdpf, XDP_XMIT_FLUSH); 3481 if (sent <= 0) 3482 return sent; 3483 return 0; 3484 } 3485 3486 static noinline int 3487 xdp_do_redirect_slow(struct net_device *dev, struct xdp_buff *xdp, 3488 struct bpf_prog *xdp_prog, struct bpf_redirect_info *ri) 3489 { 3490 struct net_device *fwd; 3491 u32 index = ri->tgt_index; 3492 int err; 3493 3494 fwd = dev_get_by_index_rcu(dev_net(dev), index); 3495 ri->tgt_index = 0; 3496 if (unlikely(!fwd)) { 3497 err = -EINVAL; 3498 goto err; 3499 } 3500 3501 err = __bpf_tx_xdp(fwd, NULL, xdp, 0); 3502 if (unlikely(err)) 3503 goto err; 3504 3505 _trace_xdp_redirect(dev, xdp_prog, index); 3506 return 0; 3507 err: 3508 _trace_xdp_redirect_err(dev, xdp_prog, index, err); 3509 return err; 3510 } 3511 3512 static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd, 3513 struct bpf_map *map, 3514 struct xdp_buff *xdp, 3515 u32 index) 3516 { 3517 int err; 3518 3519 switch (map->map_type) { 3520 case BPF_MAP_TYPE_DEVMAP: { 3521 struct bpf_dtab_netdev *dst = fwd; 3522 3523 err = dev_map_enqueue(dst, xdp, dev_rx); 3524 if (unlikely(err)) 3525 return err; 3526 break; 3527 } 3528 case BPF_MAP_TYPE_CPUMAP: { 3529 struct bpf_cpu_map_entry *rcpu = fwd; 3530 3531 err = cpu_map_enqueue(rcpu, xdp, dev_rx); 3532 if (unlikely(err)) 3533 return err; 3534 break; 3535 } 3536 case BPF_MAP_TYPE_XSKMAP: { 3537 struct xdp_sock *xs = fwd; 3538 3539 err = __xsk_map_redirect(map, xdp, xs); 3540 return err; 3541 } 3542 default: 3543 break; 3544 } 3545 return 0; 3546 } 3547 3548 void xdp_do_flush_map(void) 3549 { 3550 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 3551 struct bpf_map *map = ri->map_to_flush; 3552 3553 ri->map_to_flush = NULL; 3554 if (map) { 3555 switch (map->map_type) { 3556 case BPF_MAP_TYPE_DEVMAP: 3557 __dev_map_flush(map); 3558 break; 3559 case BPF_MAP_TYPE_CPUMAP: 3560 __cpu_map_flush(map); 3561 break; 3562 case BPF_MAP_TYPE_XSKMAP: 3563 __xsk_map_flush(map); 3564 break; 3565 default: 3566 break; 3567 } 3568 } 3569 } 3570 EXPORT_SYMBOL_GPL(xdp_do_flush_map); 3571 3572 static inline void *__xdp_map_lookup_elem(struct bpf_map *map, u32 index) 3573 { 3574 switch (map->map_type) { 3575 case BPF_MAP_TYPE_DEVMAP: 3576 return __dev_map_lookup_elem(map, index); 3577 case BPF_MAP_TYPE_CPUMAP: 3578 return __cpu_map_lookup_elem(map, index); 3579 case BPF_MAP_TYPE_XSKMAP: 3580 return __xsk_map_lookup_elem(map, index); 3581 default: 3582 return NULL; 3583 } 3584 } 3585 3586 void bpf_clear_redirect_map(struct bpf_map *map) 3587 { 3588 struct bpf_redirect_info *ri; 3589 int cpu; 3590 3591 for_each_possible_cpu(cpu) { 3592 ri = per_cpu_ptr(&bpf_redirect_info, cpu); 3593 /* Avoid polluting remote cacheline due to writes if 3594 * not needed. Once we pass this test, we need the 3595 * cmpxchg() to make sure it hasn't been changed in 3596 * the meantime by remote CPU. 3597 */ 3598 if (unlikely(READ_ONCE(ri->map) == map)) 3599 cmpxchg(&ri->map, map, NULL); 3600 } 3601 } 3602 3603 static int xdp_do_redirect_map(struct net_device *dev, struct xdp_buff *xdp, 3604 struct bpf_prog *xdp_prog, struct bpf_map *map, 3605 struct bpf_redirect_info *ri) 3606 { 3607 u32 index = ri->tgt_index; 3608 void *fwd = ri->tgt_value; 3609 int err; 3610 3611 ri->tgt_index = 0; 3612 ri->tgt_value = NULL; 3613 WRITE_ONCE(ri->map, NULL); 3614 3615 if (ri->map_to_flush && unlikely(ri->map_to_flush != map)) 3616 xdp_do_flush_map(); 3617 3618 err = __bpf_tx_xdp_map(dev, fwd, map, xdp, index); 3619 if (unlikely(err)) 3620 goto err; 3621 3622 ri->map_to_flush = map; 3623 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index); 3624 return 0; 3625 err: 3626 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err); 3627 return err; 3628 } 3629 3630 int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp, 3631 struct bpf_prog *xdp_prog) 3632 { 3633 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 3634 struct bpf_map *map = READ_ONCE(ri->map); 3635 3636 if (likely(map)) 3637 return xdp_do_redirect_map(dev, xdp, xdp_prog, map, ri); 3638 3639 return xdp_do_redirect_slow(dev, xdp, xdp_prog, ri); 3640 } 3641 EXPORT_SYMBOL_GPL(xdp_do_redirect); 3642 3643 static int xdp_do_generic_redirect_map(struct net_device *dev, 3644 struct sk_buff *skb, 3645 struct xdp_buff *xdp, 3646 struct bpf_prog *xdp_prog, 3647 struct bpf_map *map) 3648 { 3649 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 3650 u32 index = ri->tgt_index; 3651 void *fwd = ri->tgt_value; 3652 int err = 0; 3653 3654 ri->tgt_index = 0; 3655 ri->tgt_value = NULL; 3656 WRITE_ONCE(ri->map, NULL); 3657 3658 if (map->map_type == BPF_MAP_TYPE_DEVMAP) { 3659 struct bpf_dtab_netdev *dst = fwd; 3660 3661 err = dev_map_generic_redirect(dst, skb, xdp_prog); 3662 if (unlikely(err)) 3663 goto err; 3664 } else if (map->map_type == BPF_MAP_TYPE_XSKMAP) { 3665 struct xdp_sock *xs = fwd; 3666 3667 err = xsk_generic_rcv(xs, xdp); 3668 if (err) 3669 goto err; 3670 consume_skb(skb); 3671 } else { 3672 /* TODO: Handle BPF_MAP_TYPE_CPUMAP */ 3673 err = -EBADRQC; 3674 goto err; 3675 } 3676 3677 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index); 3678 return 0; 3679 err: 3680 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err); 3681 return err; 3682 } 3683 3684 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb, 3685 struct xdp_buff *xdp, struct bpf_prog *xdp_prog) 3686 { 3687 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 3688 struct bpf_map *map = READ_ONCE(ri->map); 3689 u32 index = ri->tgt_index; 3690 struct net_device *fwd; 3691 int err = 0; 3692 3693 if (map) 3694 return xdp_do_generic_redirect_map(dev, skb, xdp, xdp_prog, 3695 map); 3696 ri->tgt_index = 0; 3697 fwd = dev_get_by_index_rcu(dev_net(dev), index); 3698 if (unlikely(!fwd)) { 3699 err = -EINVAL; 3700 goto err; 3701 } 3702 3703 err = xdp_ok_fwd_dev(fwd, skb->len); 3704 if (unlikely(err)) 3705 goto err; 3706 3707 skb->dev = fwd; 3708 _trace_xdp_redirect(dev, xdp_prog, index); 3709 generic_xdp_tx(skb, xdp_prog); 3710 return 0; 3711 err: 3712 _trace_xdp_redirect_err(dev, xdp_prog, index, err); 3713 return err; 3714 } 3715 EXPORT_SYMBOL_GPL(xdp_do_generic_redirect); 3716 3717 BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags) 3718 { 3719 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 3720 3721 if (unlikely(flags)) 3722 return XDP_ABORTED; 3723 3724 ri->flags = flags; 3725 ri->tgt_index = ifindex; 3726 ri->tgt_value = NULL; 3727 WRITE_ONCE(ri->map, NULL); 3728 3729 return XDP_REDIRECT; 3730 } 3731 3732 static const struct bpf_func_proto bpf_xdp_redirect_proto = { 3733 .func = bpf_xdp_redirect, 3734 .gpl_only = false, 3735 .ret_type = RET_INTEGER, 3736 .arg1_type = ARG_ANYTHING, 3737 .arg2_type = ARG_ANYTHING, 3738 }; 3739 3740 BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex, 3741 u64, flags) 3742 { 3743 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 3744 3745 /* Lower bits of the flags are used as return code on lookup failure */ 3746 if (unlikely(flags > XDP_TX)) 3747 return XDP_ABORTED; 3748 3749 ri->tgt_value = __xdp_map_lookup_elem(map, ifindex); 3750 if (unlikely(!ri->tgt_value)) { 3751 /* If the lookup fails we want to clear out the state in the 3752 * redirect_info struct completely, so that if an eBPF program 3753 * performs multiple lookups, the last one always takes 3754 * precedence. 3755 */ 3756 WRITE_ONCE(ri->map, NULL); 3757 return flags; 3758 } 3759 3760 ri->flags = flags; 3761 ri->tgt_index = ifindex; 3762 WRITE_ONCE(ri->map, map); 3763 3764 return XDP_REDIRECT; 3765 } 3766 3767 static const struct bpf_func_proto bpf_xdp_redirect_map_proto = { 3768 .func = bpf_xdp_redirect_map, 3769 .gpl_only = false, 3770 .ret_type = RET_INTEGER, 3771 .arg1_type = ARG_CONST_MAP_PTR, 3772 .arg2_type = ARG_ANYTHING, 3773 .arg3_type = ARG_ANYTHING, 3774 }; 3775 3776 static unsigned long bpf_skb_copy(void *dst_buff, const void *skb, 3777 unsigned long off, unsigned long len) 3778 { 3779 void *ptr = skb_header_pointer(skb, off, len, dst_buff); 3780 3781 if (unlikely(!ptr)) 3782 return len; 3783 if (ptr != dst_buff) 3784 memcpy(dst_buff, ptr, len); 3785 3786 return 0; 3787 } 3788 3789 BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map, 3790 u64, flags, void *, meta, u64, meta_size) 3791 { 3792 u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32; 3793 3794 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) 3795 return -EINVAL; 3796 if (unlikely(skb_size > skb->len)) 3797 return -EFAULT; 3798 3799 return bpf_event_output(map, flags, meta, meta_size, skb, skb_size, 3800 bpf_skb_copy); 3801 } 3802 3803 static const struct bpf_func_proto bpf_skb_event_output_proto = { 3804 .func = bpf_skb_event_output, 3805 .gpl_only = true, 3806 .ret_type = RET_INTEGER, 3807 .arg1_type = ARG_PTR_TO_CTX, 3808 .arg2_type = ARG_CONST_MAP_PTR, 3809 .arg3_type = ARG_ANYTHING, 3810 .arg4_type = ARG_PTR_TO_MEM, 3811 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 3812 }; 3813 3814 static unsigned short bpf_tunnel_key_af(u64 flags) 3815 { 3816 return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET; 3817 } 3818 3819 BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to, 3820 u32, size, u64, flags) 3821 { 3822 const struct ip_tunnel_info *info = skb_tunnel_info(skb); 3823 u8 compat[sizeof(struct bpf_tunnel_key)]; 3824 void *to_orig = to; 3825 int err; 3826 3827 if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) { 3828 err = -EINVAL; 3829 goto err_clear; 3830 } 3831 if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) { 3832 err = -EPROTO; 3833 goto err_clear; 3834 } 3835 if (unlikely(size != sizeof(struct bpf_tunnel_key))) { 3836 err = -EINVAL; 3837 switch (size) { 3838 case offsetof(struct bpf_tunnel_key, tunnel_label): 3839 case offsetof(struct bpf_tunnel_key, tunnel_ext): 3840 goto set_compat; 3841 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): 3842 /* Fixup deprecated structure layouts here, so we have 3843 * a common path later on. 3844 */ 3845 if (ip_tunnel_info_af(info) != AF_INET) 3846 goto err_clear; 3847 set_compat: 3848 to = (struct bpf_tunnel_key *)compat; 3849 break; 3850 default: 3851 goto err_clear; 3852 } 3853 } 3854 3855 to->tunnel_id = be64_to_cpu(info->key.tun_id); 3856 to->tunnel_tos = info->key.tos; 3857 to->tunnel_ttl = info->key.ttl; 3858 to->tunnel_ext = 0; 3859 3860 if (flags & BPF_F_TUNINFO_IPV6) { 3861 memcpy(to->remote_ipv6, &info->key.u.ipv6.src, 3862 sizeof(to->remote_ipv6)); 3863 to->tunnel_label = be32_to_cpu(info->key.label); 3864 } else { 3865 to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src); 3866 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); 3867 to->tunnel_label = 0; 3868 } 3869 3870 if (unlikely(size != sizeof(struct bpf_tunnel_key))) 3871 memcpy(to_orig, to, size); 3872 3873 return 0; 3874 err_clear: 3875 memset(to_orig, 0, size); 3876 return err; 3877 } 3878 3879 static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = { 3880 .func = bpf_skb_get_tunnel_key, 3881 .gpl_only = false, 3882 .ret_type = RET_INTEGER, 3883 .arg1_type = ARG_PTR_TO_CTX, 3884 .arg2_type = ARG_PTR_TO_UNINIT_MEM, 3885 .arg3_type = ARG_CONST_SIZE, 3886 .arg4_type = ARG_ANYTHING, 3887 }; 3888 3889 BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size) 3890 { 3891 const struct ip_tunnel_info *info = skb_tunnel_info(skb); 3892 int err; 3893 3894 if (unlikely(!info || 3895 !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) { 3896 err = -ENOENT; 3897 goto err_clear; 3898 } 3899 if (unlikely(size < info->options_len)) { 3900 err = -ENOMEM; 3901 goto err_clear; 3902 } 3903 3904 ip_tunnel_info_opts_get(to, info); 3905 if (size > info->options_len) 3906 memset(to + info->options_len, 0, size - info->options_len); 3907 3908 return info->options_len; 3909 err_clear: 3910 memset(to, 0, size); 3911 return err; 3912 } 3913 3914 static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = { 3915 .func = bpf_skb_get_tunnel_opt, 3916 .gpl_only = false, 3917 .ret_type = RET_INTEGER, 3918 .arg1_type = ARG_PTR_TO_CTX, 3919 .arg2_type = ARG_PTR_TO_UNINIT_MEM, 3920 .arg3_type = ARG_CONST_SIZE, 3921 }; 3922 3923 static struct metadata_dst __percpu *md_dst; 3924 3925 BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb, 3926 const struct bpf_tunnel_key *, from, u32, size, u64, flags) 3927 { 3928 struct metadata_dst *md = this_cpu_ptr(md_dst); 3929 u8 compat[sizeof(struct bpf_tunnel_key)]; 3930 struct ip_tunnel_info *info; 3931 3932 if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX | 3933 BPF_F_DONT_FRAGMENT | BPF_F_SEQ_NUMBER))) 3934 return -EINVAL; 3935 if (unlikely(size != sizeof(struct bpf_tunnel_key))) { 3936 switch (size) { 3937 case offsetof(struct bpf_tunnel_key, tunnel_label): 3938 case offsetof(struct bpf_tunnel_key, tunnel_ext): 3939 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): 3940 /* Fixup deprecated structure layouts here, so we have 3941 * a common path later on. 3942 */ 3943 memcpy(compat, from, size); 3944 memset(compat + size, 0, sizeof(compat) - size); 3945 from = (const struct bpf_tunnel_key *) compat; 3946 break; 3947 default: 3948 return -EINVAL; 3949 } 3950 } 3951 if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) || 3952 from->tunnel_ext)) 3953 return -EINVAL; 3954 3955 skb_dst_drop(skb); 3956 dst_hold((struct dst_entry *) md); 3957 skb_dst_set(skb, (struct dst_entry *) md); 3958 3959 info = &md->u.tun_info; 3960 memset(info, 0, sizeof(*info)); 3961 info->mode = IP_TUNNEL_INFO_TX; 3962 3963 info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE; 3964 if (flags & BPF_F_DONT_FRAGMENT) 3965 info->key.tun_flags |= TUNNEL_DONT_FRAGMENT; 3966 if (flags & BPF_F_ZERO_CSUM_TX) 3967 info->key.tun_flags &= ~TUNNEL_CSUM; 3968 if (flags & BPF_F_SEQ_NUMBER) 3969 info->key.tun_flags |= TUNNEL_SEQ; 3970 3971 info->key.tun_id = cpu_to_be64(from->tunnel_id); 3972 info->key.tos = from->tunnel_tos; 3973 info->key.ttl = from->tunnel_ttl; 3974 3975 if (flags & BPF_F_TUNINFO_IPV6) { 3976 info->mode |= IP_TUNNEL_INFO_IPV6; 3977 memcpy(&info->key.u.ipv6.dst, from->remote_ipv6, 3978 sizeof(from->remote_ipv6)); 3979 info->key.label = cpu_to_be32(from->tunnel_label) & 3980 IPV6_FLOWLABEL_MASK; 3981 } else { 3982 info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4); 3983 } 3984 3985 return 0; 3986 } 3987 3988 static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = { 3989 .func = bpf_skb_set_tunnel_key, 3990 .gpl_only = false, 3991 .ret_type = RET_INTEGER, 3992 .arg1_type = ARG_PTR_TO_CTX, 3993 .arg2_type = ARG_PTR_TO_MEM, 3994 .arg3_type = ARG_CONST_SIZE, 3995 .arg4_type = ARG_ANYTHING, 3996 }; 3997 3998 BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb, 3999 const u8 *, from, u32, size) 4000 { 4001 struct ip_tunnel_info *info = skb_tunnel_info(skb); 4002 const struct metadata_dst *md = this_cpu_ptr(md_dst); 4003 4004 if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1)))) 4005 return -EINVAL; 4006 if (unlikely(size > IP_TUNNEL_OPTS_MAX)) 4007 return -ENOMEM; 4008 4009 ip_tunnel_info_opts_set(info, from, size, TUNNEL_OPTIONS_PRESENT); 4010 4011 return 0; 4012 } 4013 4014 static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = { 4015 .func = bpf_skb_set_tunnel_opt, 4016 .gpl_only = false, 4017 .ret_type = RET_INTEGER, 4018 .arg1_type = ARG_PTR_TO_CTX, 4019 .arg2_type = ARG_PTR_TO_MEM, 4020 .arg3_type = ARG_CONST_SIZE, 4021 }; 4022 4023 static const struct bpf_func_proto * 4024 bpf_get_skb_set_tunnel_proto(enum bpf_func_id which) 4025 { 4026 if (!md_dst) { 4027 struct metadata_dst __percpu *tmp; 4028 4029 tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX, 4030 METADATA_IP_TUNNEL, 4031 GFP_KERNEL); 4032 if (!tmp) 4033 return NULL; 4034 if (cmpxchg(&md_dst, NULL, tmp)) 4035 metadata_dst_free_percpu(tmp); 4036 } 4037 4038 switch (which) { 4039 case BPF_FUNC_skb_set_tunnel_key: 4040 return &bpf_skb_set_tunnel_key_proto; 4041 case BPF_FUNC_skb_set_tunnel_opt: 4042 return &bpf_skb_set_tunnel_opt_proto; 4043 default: 4044 return NULL; 4045 } 4046 } 4047 4048 BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map, 4049 u32, idx) 4050 { 4051 struct bpf_array *array = container_of(map, struct bpf_array, map); 4052 struct cgroup *cgrp; 4053 struct sock *sk; 4054 4055 sk = skb_to_full_sk(skb); 4056 if (!sk || !sk_fullsock(sk)) 4057 return -ENOENT; 4058 if (unlikely(idx >= array->map.max_entries)) 4059 return -E2BIG; 4060 4061 cgrp = READ_ONCE(array->ptrs[idx]); 4062 if (unlikely(!cgrp)) 4063 return -EAGAIN; 4064 4065 return sk_under_cgroup_hierarchy(sk, cgrp); 4066 } 4067 4068 static const struct bpf_func_proto bpf_skb_under_cgroup_proto = { 4069 .func = bpf_skb_under_cgroup, 4070 .gpl_only = false, 4071 .ret_type = RET_INTEGER, 4072 .arg1_type = ARG_PTR_TO_CTX, 4073 .arg2_type = ARG_CONST_MAP_PTR, 4074 .arg3_type = ARG_ANYTHING, 4075 }; 4076 4077 #ifdef CONFIG_SOCK_CGROUP_DATA 4078 BPF_CALL_1(bpf_skb_cgroup_id, const struct sk_buff *, skb) 4079 { 4080 struct sock *sk = skb_to_full_sk(skb); 4081 struct cgroup *cgrp; 4082 4083 if (!sk || !sk_fullsock(sk)) 4084 return 0; 4085 4086 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); 4087 return cgrp->kn->id.id; 4088 } 4089 4090 static const struct bpf_func_proto bpf_skb_cgroup_id_proto = { 4091 .func = bpf_skb_cgroup_id, 4092 .gpl_only = false, 4093 .ret_type = RET_INTEGER, 4094 .arg1_type = ARG_PTR_TO_CTX, 4095 }; 4096 4097 BPF_CALL_2(bpf_skb_ancestor_cgroup_id, const struct sk_buff *, skb, int, 4098 ancestor_level) 4099 { 4100 struct sock *sk = skb_to_full_sk(skb); 4101 struct cgroup *ancestor; 4102 struct cgroup *cgrp; 4103 4104 if (!sk || !sk_fullsock(sk)) 4105 return 0; 4106 4107 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); 4108 ancestor = cgroup_ancestor(cgrp, ancestor_level); 4109 if (!ancestor) 4110 return 0; 4111 4112 return ancestor->kn->id.id; 4113 } 4114 4115 static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto = { 4116 .func = bpf_skb_ancestor_cgroup_id, 4117 .gpl_only = false, 4118 .ret_type = RET_INTEGER, 4119 .arg1_type = ARG_PTR_TO_CTX, 4120 .arg2_type = ARG_ANYTHING, 4121 }; 4122 #endif 4123 4124 static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff, 4125 unsigned long off, unsigned long len) 4126 { 4127 memcpy(dst_buff, src_buff + off, len); 4128 return 0; 4129 } 4130 4131 BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map, 4132 u64, flags, void *, meta, u64, meta_size) 4133 { 4134 u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32; 4135 4136 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) 4137 return -EINVAL; 4138 if (unlikely(xdp_size > (unsigned long)(xdp->data_end - xdp->data))) 4139 return -EFAULT; 4140 4141 return bpf_event_output(map, flags, meta, meta_size, xdp->data, 4142 xdp_size, bpf_xdp_copy); 4143 } 4144 4145 static const struct bpf_func_proto bpf_xdp_event_output_proto = { 4146 .func = bpf_xdp_event_output, 4147 .gpl_only = true, 4148 .ret_type = RET_INTEGER, 4149 .arg1_type = ARG_PTR_TO_CTX, 4150 .arg2_type = ARG_CONST_MAP_PTR, 4151 .arg3_type = ARG_ANYTHING, 4152 .arg4_type = ARG_PTR_TO_MEM, 4153 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4154 }; 4155 4156 BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb) 4157 { 4158 return skb->sk ? sock_gen_cookie(skb->sk) : 0; 4159 } 4160 4161 static const struct bpf_func_proto bpf_get_socket_cookie_proto = { 4162 .func = bpf_get_socket_cookie, 4163 .gpl_only = false, 4164 .ret_type = RET_INTEGER, 4165 .arg1_type = ARG_PTR_TO_CTX, 4166 }; 4167 4168 BPF_CALL_1(bpf_get_socket_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx) 4169 { 4170 return sock_gen_cookie(ctx->sk); 4171 } 4172 4173 static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto = { 4174 .func = bpf_get_socket_cookie_sock_addr, 4175 .gpl_only = false, 4176 .ret_type = RET_INTEGER, 4177 .arg1_type = ARG_PTR_TO_CTX, 4178 }; 4179 4180 BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx) 4181 { 4182 return sock_gen_cookie(ctx->sk); 4183 } 4184 4185 static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto = { 4186 .func = bpf_get_socket_cookie_sock_ops, 4187 .gpl_only = false, 4188 .ret_type = RET_INTEGER, 4189 .arg1_type = ARG_PTR_TO_CTX, 4190 }; 4191 4192 BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb) 4193 { 4194 struct sock *sk = sk_to_full_sk(skb->sk); 4195 kuid_t kuid; 4196 4197 if (!sk || !sk_fullsock(sk)) 4198 return overflowuid; 4199 kuid = sock_net_uid(sock_net(sk), sk); 4200 return from_kuid_munged(sock_net(sk)->user_ns, kuid); 4201 } 4202 4203 static const struct bpf_func_proto bpf_get_socket_uid_proto = { 4204 .func = bpf_get_socket_uid, 4205 .gpl_only = false, 4206 .ret_type = RET_INTEGER, 4207 .arg1_type = ARG_PTR_TO_CTX, 4208 }; 4209 4210 BPF_CALL_5(bpf_sockopt_event_output, struct bpf_sock_ops_kern *, bpf_sock, 4211 struct bpf_map *, map, u64, flags, void *, data, u64, size) 4212 { 4213 if (unlikely(flags & ~(BPF_F_INDEX_MASK))) 4214 return -EINVAL; 4215 4216 return bpf_event_output(map, flags, data, size, NULL, 0, NULL); 4217 } 4218 4219 static const struct bpf_func_proto bpf_sockopt_event_output_proto = { 4220 .func = bpf_sockopt_event_output, 4221 .gpl_only = true, 4222 .ret_type = RET_INTEGER, 4223 .arg1_type = ARG_PTR_TO_CTX, 4224 .arg2_type = ARG_CONST_MAP_PTR, 4225 .arg3_type = ARG_ANYTHING, 4226 .arg4_type = ARG_PTR_TO_MEM, 4227 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4228 }; 4229 4230 BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, 4231 int, level, int, optname, char *, optval, int, optlen) 4232 { 4233 struct sock *sk = bpf_sock->sk; 4234 int ret = 0; 4235 int val; 4236 4237 if (!sk_fullsock(sk)) 4238 return -EINVAL; 4239 4240 if (level == SOL_SOCKET) { 4241 if (optlen != sizeof(int)) 4242 return -EINVAL; 4243 val = *((int *)optval); 4244 4245 /* Only some socketops are supported */ 4246 switch (optname) { 4247 case SO_RCVBUF: 4248 val = min_t(u32, val, sysctl_rmem_max); 4249 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 4250 sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF); 4251 break; 4252 case SO_SNDBUF: 4253 val = min_t(u32, val, sysctl_wmem_max); 4254 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 4255 sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF); 4256 break; 4257 case SO_MAX_PACING_RATE: /* 32bit version */ 4258 if (val != ~0U) 4259 cmpxchg(&sk->sk_pacing_status, 4260 SK_PACING_NONE, 4261 SK_PACING_NEEDED); 4262 sk->sk_max_pacing_rate = (val == ~0U) ? ~0UL : val; 4263 sk->sk_pacing_rate = min(sk->sk_pacing_rate, 4264 sk->sk_max_pacing_rate); 4265 break; 4266 case SO_PRIORITY: 4267 sk->sk_priority = val; 4268 break; 4269 case SO_RCVLOWAT: 4270 if (val < 0) 4271 val = INT_MAX; 4272 sk->sk_rcvlowat = val ? : 1; 4273 break; 4274 case SO_MARK: 4275 if (sk->sk_mark != val) { 4276 sk->sk_mark = val; 4277 sk_dst_reset(sk); 4278 } 4279 break; 4280 default: 4281 ret = -EINVAL; 4282 } 4283 #ifdef CONFIG_INET 4284 } else if (level == SOL_IP) { 4285 if (optlen != sizeof(int) || sk->sk_family != AF_INET) 4286 return -EINVAL; 4287 4288 val = *((int *)optval); 4289 /* Only some options are supported */ 4290 switch (optname) { 4291 case IP_TOS: 4292 if (val < -1 || val > 0xff) { 4293 ret = -EINVAL; 4294 } else { 4295 struct inet_sock *inet = inet_sk(sk); 4296 4297 if (val == -1) 4298 val = 0; 4299 inet->tos = val; 4300 } 4301 break; 4302 default: 4303 ret = -EINVAL; 4304 } 4305 #if IS_ENABLED(CONFIG_IPV6) 4306 } else if (level == SOL_IPV6) { 4307 if (optlen != sizeof(int) || sk->sk_family != AF_INET6) 4308 return -EINVAL; 4309 4310 val = *((int *)optval); 4311 /* Only some options are supported */ 4312 switch (optname) { 4313 case IPV6_TCLASS: 4314 if (val < -1 || val > 0xff) { 4315 ret = -EINVAL; 4316 } else { 4317 struct ipv6_pinfo *np = inet6_sk(sk); 4318 4319 if (val == -1) 4320 val = 0; 4321 np->tclass = val; 4322 } 4323 break; 4324 default: 4325 ret = -EINVAL; 4326 } 4327 #endif 4328 } else if (level == SOL_TCP && 4329 sk->sk_prot->setsockopt == tcp_setsockopt) { 4330 if (optname == TCP_CONGESTION) { 4331 char name[TCP_CA_NAME_MAX]; 4332 bool reinit = bpf_sock->op > BPF_SOCK_OPS_NEEDS_ECN; 4333 4334 strncpy(name, optval, min_t(long, optlen, 4335 TCP_CA_NAME_MAX-1)); 4336 name[TCP_CA_NAME_MAX-1] = 0; 4337 ret = tcp_set_congestion_control(sk, name, false, 4338 reinit); 4339 } else { 4340 struct tcp_sock *tp = tcp_sk(sk); 4341 4342 if (optlen != sizeof(int)) 4343 return -EINVAL; 4344 4345 val = *((int *)optval); 4346 /* Only some options are supported */ 4347 switch (optname) { 4348 case TCP_BPF_IW: 4349 if (val <= 0 || tp->data_segs_out > tp->syn_data) 4350 ret = -EINVAL; 4351 else 4352 tp->snd_cwnd = val; 4353 break; 4354 case TCP_BPF_SNDCWND_CLAMP: 4355 if (val <= 0) { 4356 ret = -EINVAL; 4357 } else { 4358 tp->snd_cwnd_clamp = val; 4359 tp->snd_ssthresh = val; 4360 } 4361 break; 4362 case TCP_SAVE_SYN: 4363 if (val < 0 || val > 1) 4364 ret = -EINVAL; 4365 else 4366 tp->save_syn = val; 4367 break; 4368 default: 4369 ret = -EINVAL; 4370 } 4371 } 4372 #endif 4373 } else { 4374 ret = -EINVAL; 4375 } 4376 return ret; 4377 } 4378 4379 static const struct bpf_func_proto bpf_setsockopt_proto = { 4380 .func = bpf_setsockopt, 4381 .gpl_only = false, 4382 .ret_type = RET_INTEGER, 4383 .arg1_type = ARG_PTR_TO_CTX, 4384 .arg2_type = ARG_ANYTHING, 4385 .arg3_type = ARG_ANYTHING, 4386 .arg4_type = ARG_PTR_TO_MEM, 4387 .arg5_type = ARG_CONST_SIZE, 4388 }; 4389 4390 BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock, 4391 int, level, int, optname, char *, optval, int, optlen) 4392 { 4393 struct sock *sk = bpf_sock->sk; 4394 4395 if (!sk_fullsock(sk)) 4396 goto err_clear; 4397 #ifdef CONFIG_INET 4398 if (level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) { 4399 struct inet_connection_sock *icsk; 4400 struct tcp_sock *tp; 4401 4402 switch (optname) { 4403 case TCP_CONGESTION: 4404 icsk = inet_csk(sk); 4405 4406 if (!icsk->icsk_ca_ops || optlen <= 1) 4407 goto err_clear; 4408 strncpy(optval, icsk->icsk_ca_ops->name, optlen); 4409 optval[optlen - 1] = 0; 4410 break; 4411 case TCP_SAVED_SYN: 4412 tp = tcp_sk(sk); 4413 4414 if (optlen <= 0 || !tp->saved_syn || 4415 optlen > tp->saved_syn[0]) 4416 goto err_clear; 4417 memcpy(optval, tp->saved_syn + 1, optlen); 4418 break; 4419 default: 4420 goto err_clear; 4421 } 4422 } else if (level == SOL_IP) { 4423 struct inet_sock *inet = inet_sk(sk); 4424 4425 if (optlen != sizeof(int) || sk->sk_family != AF_INET) 4426 goto err_clear; 4427 4428 /* Only some options are supported */ 4429 switch (optname) { 4430 case IP_TOS: 4431 *((int *)optval) = (int)inet->tos; 4432 break; 4433 default: 4434 goto err_clear; 4435 } 4436 #if IS_ENABLED(CONFIG_IPV6) 4437 } else if (level == SOL_IPV6) { 4438 struct ipv6_pinfo *np = inet6_sk(sk); 4439 4440 if (optlen != sizeof(int) || sk->sk_family != AF_INET6) 4441 goto err_clear; 4442 4443 /* Only some options are supported */ 4444 switch (optname) { 4445 case IPV6_TCLASS: 4446 *((int *)optval) = (int)np->tclass; 4447 break; 4448 default: 4449 goto err_clear; 4450 } 4451 #endif 4452 } else { 4453 goto err_clear; 4454 } 4455 return 0; 4456 #endif 4457 err_clear: 4458 memset(optval, 0, optlen); 4459 return -EINVAL; 4460 } 4461 4462 static const struct bpf_func_proto bpf_getsockopt_proto = { 4463 .func = bpf_getsockopt, 4464 .gpl_only = false, 4465 .ret_type = RET_INTEGER, 4466 .arg1_type = ARG_PTR_TO_CTX, 4467 .arg2_type = ARG_ANYTHING, 4468 .arg3_type = ARG_ANYTHING, 4469 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 4470 .arg5_type = ARG_CONST_SIZE, 4471 }; 4472 4473 BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock, 4474 int, argval) 4475 { 4476 struct sock *sk = bpf_sock->sk; 4477 int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS; 4478 4479 if (!IS_ENABLED(CONFIG_INET) || !sk_fullsock(sk)) 4480 return -EINVAL; 4481 4482 tcp_sk(sk)->bpf_sock_ops_cb_flags = val; 4483 4484 return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS); 4485 } 4486 4487 static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = { 4488 .func = bpf_sock_ops_cb_flags_set, 4489 .gpl_only = false, 4490 .ret_type = RET_INTEGER, 4491 .arg1_type = ARG_PTR_TO_CTX, 4492 .arg2_type = ARG_ANYTHING, 4493 }; 4494 4495 const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly; 4496 EXPORT_SYMBOL_GPL(ipv6_bpf_stub); 4497 4498 BPF_CALL_3(bpf_bind, struct bpf_sock_addr_kern *, ctx, struct sockaddr *, addr, 4499 int, addr_len) 4500 { 4501 #ifdef CONFIG_INET 4502 struct sock *sk = ctx->sk; 4503 int err; 4504 4505 /* Binding to port can be expensive so it's prohibited in the helper. 4506 * Only binding to IP is supported. 4507 */ 4508 err = -EINVAL; 4509 if (addr_len < offsetofend(struct sockaddr, sa_family)) 4510 return err; 4511 if (addr->sa_family == AF_INET) { 4512 if (addr_len < sizeof(struct sockaddr_in)) 4513 return err; 4514 if (((struct sockaddr_in *)addr)->sin_port != htons(0)) 4515 return err; 4516 return __inet_bind(sk, addr, addr_len, true, false); 4517 #if IS_ENABLED(CONFIG_IPV6) 4518 } else if (addr->sa_family == AF_INET6) { 4519 if (addr_len < SIN6_LEN_RFC2133) 4520 return err; 4521 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) 4522 return err; 4523 /* ipv6_bpf_stub cannot be NULL, since it's called from 4524 * bpf_cgroup_inet6_connect hook and ipv6 is already loaded 4525 */ 4526 return ipv6_bpf_stub->inet6_bind(sk, addr, addr_len, true, false); 4527 #endif /* CONFIG_IPV6 */ 4528 } 4529 #endif /* CONFIG_INET */ 4530 4531 return -EAFNOSUPPORT; 4532 } 4533 4534 static const struct bpf_func_proto bpf_bind_proto = { 4535 .func = bpf_bind, 4536 .gpl_only = false, 4537 .ret_type = RET_INTEGER, 4538 .arg1_type = ARG_PTR_TO_CTX, 4539 .arg2_type = ARG_PTR_TO_MEM, 4540 .arg3_type = ARG_CONST_SIZE, 4541 }; 4542 4543 #ifdef CONFIG_XFRM 4544 BPF_CALL_5(bpf_skb_get_xfrm_state, struct sk_buff *, skb, u32, index, 4545 struct bpf_xfrm_state *, to, u32, size, u64, flags) 4546 { 4547 const struct sec_path *sp = skb_sec_path(skb); 4548 const struct xfrm_state *x; 4549 4550 if (!sp || unlikely(index >= sp->len || flags)) 4551 goto err_clear; 4552 4553 x = sp->xvec[index]; 4554 4555 if (unlikely(size != sizeof(struct bpf_xfrm_state))) 4556 goto err_clear; 4557 4558 to->reqid = x->props.reqid; 4559 to->spi = x->id.spi; 4560 to->family = x->props.family; 4561 to->ext = 0; 4562 4563 if (to->family == AF_INET6) { 4564 memcpy(to->remote_ipv6, x->props.saddr.a6, 4565 sizeof(to->remote_ipv6)); 4566 } else { 4567 to->remote_ipv4 = x->props.saddr.a4; 4568 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); 4569 } 4570 4571 return 0; 4572 err_clear: 4573 memset(to, 0, size); 4574 return -EINVAL; 4575 } 4576 4577 static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto = { 4578 .func = bpf_skb_get_xfrm_state, 4579 .gpl_only = false, 4580 .ret_type = RET_INTEGER, 4581 .arg1_type = ARG_PTR_TO_CTX, 4582 .arg2_type = ARG_ANYTHING, 4583 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 4584 .arg4_type = ARG_CONST_SIZE, 4585 .arg5_type = ARG_ANYTHING, 4586 }; 4587 #endif 4588 4589 #if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6) 4590 static int bpf_fib_set_fwd_params(struct bpf_fib_lookup *params, 4591 const struct neighbour *neigh, 4592 const struct net_device *dev) 4593 { 4594 memcpy(params->dmac, neigh->ha, ETH_ALEN); 4595 memcpy(params->smac, dev->dev_addr, ETH_ALEN); 4596 params->h_vlan_TCI = 0; 4597 params->h_vlan_proto = 0; 4598 params->ifindex = dev->ifindex; 4599 4600 return 0; 4601 } 4602 #endif 4603 4604 #if IS_ENABLED(CONFIG_INET) 4605 static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params, 4606 u32 flags, bool check_mtu) 4607 { 4608 struct fib_nh_common *nhc; 4609 struct in_device *in_dev; 4610 struct neighbour *neigh; 4611 struct net_device *dev; 4612 struct fib_result res; 4613 struct flowi4 fl4; 4614 int err; 4615 u32 mtu; 4616 4617 dev = dev_get_by_index_rcu(net, params->ifindex); 4618 if (unlikely(!dev)) 4619 return -ENODEV; 4620 4621 /* verify forwarding is enabled on this interface */ 4622 in_dev = __in_dev_get_rcu(dev); 4623 if (unlikely(!in_dev || !IN_DEV_FORWARD(in_dev))) 4624 return BPF_FIB_LKUP_RET_FWD_DISABLED; 4625 4626 if (flags & BPF_FIB_LOOKUP_OUTPUT) { 4627 fl4.flowi4_iif = 1; 4628 fl4.flowi4_oif = params->ifindex; 4629 } else { 4630 fl4.flowi4_iif = params->ifindex; 4631 fl4.flowi4_oif = 0; 4632 } 4633 fl4.flowi4_tos = params->tos & IPTOS_RT_MASK; 4634 fl4.flowi4_scope = RT_SCOPE_UNIVERSE; 4635 fl4.flowi4_flags = 0; 4636 4637 fl4.flowi4_proto = params->l4_protocol; 4638 fl4.daddr = params->ipv4_dst; 4639 fl4.saddr = params->ipv4_src; 4640 fl4.fl4_sport = params->sport; 4641 fl4.fl4_dport = params->dport; 4642 4643 if (flags & BPF_FIB_LOOKUP_DIRECT) { 4644 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; 4645 struct fib_table *tb; 4646 4647 tb = fib_get_table(net, tbid); 4648 if (unlikely(!tb)) 4649 return BPF_FIB_LKUP_RET_NOT_FWDED; 4650 4651 err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); 4652 } else { 4653 fl4.flowi4_mark = 0; 4654 fl4.flowi4_secid = 0; 4655 fl4.flowi4_tun_key.tun_id = 0; 4656 fl4.flowi4_uid = sock_net_uid(net, NULL); 4657 4658 err = fib_lookup(net, &fl4, &res, FIB_LOOKUP_NOREF); 4659 } 4660 4661 if (err) { 4662 /* map fib lookup errors to RTN_ type */ 4663 if (err == -EINVAL) 4664 return BPF_FIB_LKUP_RET_BLACKHOLE; 4665 if (err == -EHOSTUNREACH) 4666 return BPF_FIB_LKUP_RET_UNREACHABLE; 4667 if (err == -EACCES) 4668 return BPF_FIB_LKUP_RET_PROHIBIT; 4669 4670 return BPF_FIB_LKUP_RET_NOT_FWDED; 4671 } 4672 4673 if (res.type != RTN_UNICAST) 4674 return BPF_FIB_LKUP_RET_NOT_FWDED; 4675 4676 if (fib_info_num_path(res.fi) > 1) 4677 fib_select_path(net, &res, &fl4, NULL); 4678 4679 if (check_mtu) { 4680 mtu = ip_mtu_from_fib_result(&res, params->ipv4_dst); 4681 if (params->tot_len > mtu) 4682 return BPF_FIB_LKUP_RET_FRAG_NEEDED; 4683 } 4684 4685 nhc = res.nhc; 4686 4687 /* do not handle lwt encaps right now */ 4688 if (nhc->nhc_lwtstate) 4689 return BPF_FIB_LKUP_RET_UNSUPP_LWT; 4690 4691 dev = nhc->nhc_dev; 4692 4693 params->rt_metric = res.fi->fib_priority; 4694 4695 /* xdp and cls_bpf programs are run in RCU-bh so 4696 * rcu_read_lock_bh is not needed here 4697 */ 4698 if (likely(nhc->nhc_gw_family != AF_INET6)) { 4699 if (nhc->nhc_gw_family) 4700 params->ipv4_dst = nhc->nhc_gw.ipv4; 4701 4702 neigh = __ipv4_neigh_lookup_noref(dev, 4703 (__force u32)params->ipv4_dst); 4704 } else { 4705 struct in6_addr *dst = (struct in6_addr *)params->ipv6_dst; 4706 4707 params->family = AF_INET6; 4708 *dst = nhc->nhc_gw.ipv6; 4709 neigh = __ipv6_neigh_lookup_noref_stub(dev, dst); 4710 } 4711 4712 if (!neigh) 4713 return BPF_FIB_LKUP_RET_NO_NEIGH; 4714 4715 return bpf_fib_set_fwd_params(params, neigh, dev); 4716 } 4717 #endif 4718 4719 #if IS_ENABLED(CONFIG_IPV6) 4720 static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params, 4721 u32 flags, bool check_mtu) 4722 { 4723 struct in6_addr *src = (struct in6_addr *) params->ipv6_src; 4724 struct in6_addr *dst = (struct in6_addr *) params->ipv6_dst; 4725 struct fib6_result res = {}; 4726 struct neighbour *neigh; 4727 struct net_device *dev; 4728 struct inet6_dev *idev; 4729 struct flowi6 fl6; 4730 int strict = 0; 4731 int oif, err; 4732 u32 mtu; 4733 4734 /* link local addresses are never forwarded */ 4735 if (rt6_need_strict(dst) || rt6_need_strict(src)) 4736 return BPF_FIB_LKUP_RET_NOT_FWDED; 4737 4738 dev = dev_get_by_index_rcu(net, params->ifindex); 4739 if (unlikely(!dev)) 4740 return -ENODEV; 4741 4742 idev = __in6_dev_get_safely(dev); 4743 if (unlikely(!idev || !idev->cnf.forwarding)) 4744 return BPF_FIB_LKUP_RET_FWD_DISABLED; 4745 4746 if (flags & BPF_FIB_LOOKUP_OUTPUT) { 4747 fl6.flowi6_iif = 1; 4748 oif = fl6.flowi6_oif = params->ifindex; 4749 } else { 4750 oif = fl6.flowi6_iif = params->ifindex; 4751 fl6.flowi6_oif = 0; 4752 strict = RT6_LOOKUP_F_HAS_SADDR; 4753 } 4754 fl6.flowlabel = params->flowinfo; 4755 fl6.flowi6_scope = 0; 4756 fl6.flowi6_flags = 0; 4757 fl6.mp_hash = 0; 4758 4759 fl6.flowi6_proto = params->l4_protocol; 4760 fl6.daddr = *dst; 4761 fl6.saddr = *src; 4762 fl6.fl6_sport = params->sport; 4763 fl6.fl6_dport = params->dport; 4764 4765 if (flags & BPF_FIB_LOOKUP_DIRECT) { 4766 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; 4767 struct fib6_table *tb; 4768 4769 tb = ipv6_stub->fib6_get_table(net, tbid); 4770 if (unlikely(!tb)) 4771 return BPF_FIB_LKUP_RET_NOT_FWDED; 4772 4773 err = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6, &res, 4774 strict); 4775 } else { 4776 fl6.flowi6_mark = 0; 4777 fl6.flowi6_secid = 0; 4778 fl6.flowi6_tun_key.tun_id = 0; 4779 fl6.flowi6_uid = sock_net_uid(net, NULL); 4780 4781 err = ipv6_stub->fib6_lookup(net, oif, &fl6, &res, strict); 4782 } 4783 4784 if (unlikely(err || IS_ERR_OR_NULL(res.f6i) || 4785 res.f6i == net->ipv6.fib6_null_entry)) 4786 return BPF_FIB_LKUP_RET_NOT_FWDED; 4787 4788 switch (res.fib6_type) { 4789 /* only unicast is forwarded */ 4790 case RTN_UNICAST: 4791 break; 4792 case RTN_BLACKHOLE: 4793 return BPF_FIB_LKUP_RET_BLACKHOLE; 4794 case RTN_UNREACHABLE: 4795 return BPF_FIB_LKUP_RET_UNREACHABLE; 4796 case RTN_PROHIBIT: 4797 return BPF_FIB_LKUP_RET_PROHIBIT; 4798 default: 4799 return BPF_FIB_LKUP_RET_NOT_FWDED; 4800 } 4801 4802 ipv6_stub->fib6_select_path(net, &res, &fl6, fl6.flowi6_oif, 4803 fl6.flowi6_oif != 0, NULL, strict); 4804 4805 if (check_mtu) { 4806 mtu = ipv6_stub->ip6_mtu_from_fib6(&res, dst, src); 4807 if (params->tot_len > mtu) 4808 return BPF_FIB_LKUP_RET_FRAG_NEEDED; 4809 } 4810 4811 if (res.nh->fib_nh_lws) 4812 return BPF_FIB_LKUP_RET_UNSUPP_LWT; 4813 4814 if (res.nh->fib_nh_gw_family) 4815 *dst = res.nh->fib_nh_gw6; 4816 4817 dev = res.nh->fib_nh_dev; 4818 params->rt_metric = res.f6i->fib6_metric; 4819 4820 /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is 4821 * not needed here. 4822 */ 4823 neigh = __ipv6_neigh_lookup_noref_stub(dev, dst); 4824 if (!neigh) 4825 return BPF_FIB_LKUP_RET_NO_NEIGH; 4826 4827 return bpf_fib_set_fwd_params(params, neigh, dev); 4828 } 4829 #endif 4830 4831 BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx, 4832 struct bpf_fib_lookup *, params, int, plen, u32, flags) 4833 { 4834 if (plen < sizeof(*params)) 4835 return -EINVAL; 4836 4837 if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT)) 4838 return -EINVAL; 4839 4840 switch (params->family) { 4841 #if IS_ENABLED(CONFIG_INET) 4842 case AF_INET: 4843 return bpf_ipv4_fib_lookup(dev_net(ctx->rxq->dev), params, 4844 flags, true); 4845 #endif 4846 #if IS_ENABLED(CONFIG_IPV6) 4847 case AF_INET6: 4848 return bpf_ipv6_fib_lookup(dev_net(ctx->rxq->dev), params, 4849 flags, true); 4850 #endif 4851 } 4852 return -EAFNOSUPPORT; 4853 } 4854 4855 static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = { 4856 .func = bpf_xdp_fib_lookup, 4857 .gpl_only = true, 4858 .ret_type = RET_INTEGER, 4859 .arg1_type = ARG_PTR_TO_CTX, 4860 .arg2_type = ARG_PTR_TO_MEM, 4861 .arg3_type = ARG_CONST_SIZE, 4862 .arg4_type = ARG_ANYTHING, 4863 }; 4864 4865 BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb, 4866 struct bpf_fib_lookup *, params, int, plen, u32, flags) 4867 { 4868 struct net *net = dev_net(skb->dev); 4869 int rc = -EAFNOSUPPORT; 4870 4871 if (plen < sizeof(*params)) 4872 return -EINVAL; 4873 4874 if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT)) 4875 return -EINVAL; 4876 4877 switch (params->family) { 4878 #if IS_ENABLED(CONFIG_INET) 4879 case AF_INET: 4880 rc = bpf_ipv4_fib_lookup(net, params, flags, false); 4881 break; 4882 #endif 4883 #if IS_ENABLED(CONFIG_IPV6) 4884 case AF_INET6: 4885 rc = bpf_ipv6_fib_lookup(net, params, flags, false); 4886 break; 4887 #endif 4888 } 4889 4890 if (!rc) { 4891 struct net_device *dev; 4892 4893 dev = dev_get_by_index_rcu(net, params->ifindex); 4894 if (!is_skb_forwardable(dev, skb)) 4895 rc = BPF_FIB_LKUP_RET_FRAG_NEEDED; 4896 } 4897 4898 return rc; 4899 } 4900 4901 static const struct bpf_func_proto bpf_skb_fib_lookup_proto = { 4902 .func = bpf_skb_fib_lookup, 4903 .gpl_only = true, 4904 .ret_type = RET_INTEGER, 4905 .arg1_type = ARG_PTR_TO_CTX, 4906 .arg2_type = ARG_PTR_TO_MEM, 4907 .arg3_type = ARG_CONST_SIZE, 4908 .arg4_type = ARG_ANYTHING, 4909 }; 4910 4911 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 4912 static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len) 4913 { 4914 int err; 4915 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)hdr; 4916 4917 if (!seg6_validate_srh(srh, len)) 4918 return -EINVAL; 4919 4920 switch (type) { 4921 case BPF_LWT_ENCAP_SEG6_INLINE: 4922 if (skb->protocol != htons(ETH_P_IPV6)) 4923 return -EBADMSG; 4924 4925 err = seg6_do_srh_inline(skb, srh); 4926 break; 4927 case BPF_LWT_ENCAP_SEG6: 4928 skb_reset_inner_headers(skb); 4929 skb->encapsulation = 1; 4930 err = seg6_do_srh_encap(skb, srh, IPPROTO_IPV6); 4931 break; 4932 default: 4933 return -EINVAL; 4934 } 4935 4936 bpf_compute_data_pointers(skb); 4937 if (err) 4938 return err; 4939 4940 ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); 4941 skb_set_transport_header(skb, sizeof(struct ipv6hdr)); 4942 4943 return seg6_lookup_nexthop(skb, NULL, 0); 4944 } 4945 #endif /* CONFIG_IPV6_SEG6_BPF */ 4946 4947 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 4948 static int bpf_push_ip_encap(struct sk_buff *skb, void *hdr, u32 len, 4949 bool ingress) 4950 { 4951 return bpf_lwt_push_ip_encap(skb, hdr, len, ingress); 4952 } 4953 #endif 4954 4955 BPF_CALL_4(bpf_lwt_in_push_encap, struct sk_buff *, skb, u32, type, void *, hdr, 4956 u32, len) 4957 { 4958 switch (type) { 4959 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 4960 case BPF_LWT_ENCAP_SEG6: 4961 case BPF_LWT_ENCAP_SEG6_INLINE: 4962 return bpf_push_seg6_encap(skb, type, hdr, len); 4963 #endif 4964 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 4965 case BPF_LWT_ENCAP_IP: 4966 return bpf_push_ip_encap(skb, hdr, len, true /* ingress */); 4967 #endif 4968 default: 4969 return -EINVAL; 4970 } 4971 } 4972 4973 BPF_CALL_4(bpf_lwt_xmit_push_encap, struct sk_buff *, skb, u32, type, 4974 void *, hdr, u32, len) 4975 { 4976 switch (type) { 4977 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 4978 case BPF_LWT_ENCAP_IP: 4979 return bpf_push_ip_encap(skb, hdr, len, false /* egress */); 4980 #endif 4981 default: 4982 return -EINVAL; 4983 } 4984 } 4985 4986 static const struct bpf_func_proto bpf_lwt_in_push_encap_proto = { 4987 .func = bpf_lwt_in_push_encap, 4988 .gpl_only = false, 4989 .ret_type = RET_INTEGER, 4990 .arg1_type = ARG_PTR_TO_CTX, 4991 .arg2_type = ARG_ANYTHING, 4992 .arg3_type = ARG_PTR_TO_MEM, 4993 .arg4_type = ARG_CONST_SIZE 4994 }; 4995 4996 static const struct bpf_func_proto bpf_lwt_xmit_push_encap_proto = { 4997 .func = bpf_lwt_xmit_push_encap, 4998 .gpl_only = false, 4999 .ret_type = RET_INTEGER, 5000 .arg1_type = ARG_PTR_TO_CTX, 5001 .arg2_type = ARG_ANYTHING, 5002 .arg3_type = ARG_PTR_TO_MEM, 5003 .arg4_type = ARG_CONST_SIZE 5004 }; 5005 5006 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 5007 BPF_CALL_4(bpf_lwt_seg6_store_bytes, struct sk_buff *, skb, u32, offset, 5008 const void *, from, u32, len) 5009 { 5010 struct seg6_bpf_srh_state *srh_state = 5011 this_cpu_ptr(&seg6_bpf_srh_states); 5012 struct ipv6_sr_hdr *srh = srh_state->srh; 5013 void *srh_tlvs, *srh_end, *ptr; 5014 int srhoff = 0; 5015 5016 if (srh == NULL) 5017 return -EINVAL; 5018 5019 srh_tlvs = (void *)((char *)srh + ((srh->first_segment + 1) << 4)); 5020 srh_end = (void *)((char *)srh + sizeof(*srh) + srh_state->hdrlen); 5021 5022 ptr = skb->data + offset; 5023 if (ptr >= srh_tlvs && ptr + len <= srh_end) 5024 srh_state->valid = false; 5025 else if (ptr < (void *)&srh->flags || 5026 ptr + len > (void *)&srh->segments) 5027 return -EFAULT; 5028 5029 if (unlikely(bpf_try_make_writable(skb, offset + len))) 5030 return -EFAULT; 5031 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) 5032 return -EINVAL; 5033 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 5034 5035 memcpy(skb->data + offset, from, len); 5036 return 0; 5037 } 5038 5039 static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto = { 5040 .func = bpf_lwt_seg6_store_bytes, 5041 .gpl_only = false, 5042 .ret_type = RET_INTEGER, 5043 .arg1_type = ARG_PTR_TO_CTX, 5044 .arg2_type = ARG_ANYTHING, 5045 .arg3_type = ARG_PTR_TO_MEM, 5046 .arg4_type = ARG_CONST_SIZE 5047 }; 5048 5049 static void bpf_update_srh_state(struct sk_buff *skb) 5050 { 5051 struct seg6_bpf_srh_state *srh_state = 5052 this_cpu_ptr(&seg6_bpf_srh_states); 5053 int srhoff = 0; 5054 5055 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) { 5056 srh_state->srh = NULL; 5057 } else { 5058 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 5059 srh_state->hdrlen = srh_state->srh->hdrlen << 3; 5060 srh_state->valid = true; 5061 } 5062 } 5063 5064 BPF_CALL_4(bpf_lwt_seg6_action, struct sk_buff *, skb, 5065 u32, action, void *, param, u32, param_len) 5066 { 5067 struct seg6_bpf_srh_state *srh_state = 5068 this_cpu_ptr(&seg6_bpf_srh_states); 5069 int hdroff = 0; 5070 int err; 5071 5072 switch (action) { 5073 case SEG6_LOCAL_ACTION_END_X: 5074 if (!seg6_bpf_has_valid_srh(skb)) 5075 return -EBADMSG; 5076 if (param_len != sizeof(struct in6_addr)) 5077 return -EINVAL; 5078 return seg6_lookup_nexthop(skb, (struct in6_addr *)param, 0); 5079 case SEG6_LOCAL_ACTION_END_T: 5080 if (!seg6_bpf_has_valid_srh(skb)) 5081 return -EBADMSG; 5082 if (param_len != sizeof(int)) 5083 return -EINVAL; 5084 return seg6_lookup_nexthop(skb, NULL, *(int *)param); 5085 case SEG6_LOCAL_ACTION_END_DT6: 5086 if (!seg6_bpf_has_valid_srh(skb)) 5087 return -EBADMSG; 5088 if (param_len != sizeof(int)) 5089 return -EINVAL; 5090 5091 if (ipv6_find_hdr(skb, &hdroff, IPPROTO_IPV6, NULL, NULL) < 0) 5092 return -EBADMSG; 5093 if (!pskb_pull(skb, hdroff)) 5094 return -EBADMSG; 5095 5096 skb_postpull_rcsum(skb, skb_network_header(skb), hdroff); 5097 skb_reset_network_header(skb); 5098 skb_reset_transport_header(skb); 5099 skb->encapsulation = 0; 5100 5101 bpf_compute_data_pointers(skb); 5102 bpf_update_srh_state(skb); 5103 return seg6_lookup_nexthop(skb, NULL, *(int *)param); 5104 case SEG6_LOCAL_ACTION_END_B6: 5105 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) 5106 return -EBADMSG; 5107 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6_INLINE, 5108 param, param_len); 5109 if (!err) 5110 bpf_update_srh_state(skb); 5111 5112 return err; 5113 case SEG6_LOCAL_ACTION_END_B6_ENCAP: 5114 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) 5115 return -EBADMSG; 5116 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6, 5117 param, param_len); 5118 if (!err) 5119 bpf_update_srh_state(skb); 5120 5121 return err; 5122 default: 5123 return -EINVAL; 5124 } 5125 } 5126 5127 static const struct bpf_func_proto bpf_lwt_seg6_action_proto = { 5128 .func = bpf_lwt_seg6_action, 5129 .gpl_only = false, 5130 .ret_type = RET_INTEGER, 5131 .arg1_type = ARG_PTR_TO_CTX, 5132 .arg2_type = ARG_ANYTHING, 5133 .arg3_type = ARG_PTR_TO_MEM, 5134 .arg4_type = ARG_CONST_SIZE 5135 }; 5136 5137 BPF_CALL_3(bpf_lwt_seg6_adjust_srh, struct sk_buff *, skb, u32, offset, 5138 s32, len) 5139 { 5140 struct seg6_bpf_srh_state *srh_state = 5141 this_cpu_ptr(&seg6_bpf_srh_states); 5142 struct ipv6_sr_hdr *srh = srh_state->srh; 5143 void *srh_end, *srh_tlvs, *ptr; 5144 struct ipv6hdr *hdr; 5145 int srhoff = 0; 5146 int ret; 5147 5148 if (unlikely(srh == NULL)) 5149 return -EINVAL; 5150 5151 srh_tlvs = (void *)((unsigned char *)srh + sizeof(*srh) + 5152 ((srh->first_segment + 1) << 4)); 5153 srh_end = (void *)((unsigned char *)srh + sizeof(*srh) + 5154 srh_state->hdrlen); 5155 ptr = skb->data + offset; 5156 5157 if (unlikely(ptr < srh_tlvs || ptr > srh_end)) 5158 return -EFAULT; 5159 if (unlikely(len < 0 && (void *)((char *)ptr - len) > srh_end)) 5160 return -EFAULT; 5161 5162 if (len > 0) { 5163 ret = skb_cow_head(skb, len); 5164 if (unlikely(ret < 0)) 5165 return ret; 5166 5167 ret = bpf_skb_net_hdr_push(skb, offset, len); 5168 } else { 5169 ret = bpf_skb_net_hdr_pop(skb, offset, -1 * len); 5170 } 5171 5172 bpf_compute_data_pointers(skb); 5173 if (unlikely(ret < 0)) 5174 return ret; 5175 5176 hdr = (struct ipv6hdr *)skb->data; 5177 hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); 5178 5179 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) 5180 return -EINVAL; 5181 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 5182 srh_state->hdrlen += len; 5183 srh_state->valid = false; 5184 return 0; 5185 } 5186 5187 static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = { 5188 .func = bpf_lwt_seg6_adjust_srh, 5189 .gpl_only = false, 5190 .ret_type = RET_INTEGER, 5191 .arg1_type = ARG_PTR_TO_CTX, 5192 .arg2_type = ARG_ANYTHING, 5193 .arg3_type = ARG_ANYTHING, 5194 }; 5195 #endif /* CONFIG_IPV6_SEG6_BPF */ 5196 5197 #ifdef CONFIG_INET 5198 static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple, 5199 int dif, int sdif, u8 family, u8 proto) 5200 { 5201 bool refcounted = false; 5202 struct sock *sk = NULL; 5203 5204 if (family == AF_INET) { 5205 __be32 src4 = tuple->ipv4.saddr; 5206 __be32 dst4 = tuple->ipv4.daddr; 5207 5208 if (proto == IPPROTO_TCP) 5209 sk = __inet_lookup(net, &tcp_hashinfo, NULL, 0, 5210 src4, tuple->ipv4.sport, 5211 dst4, tuple->ipv4.dport, 5212 dif, sdif, &refcounted); 5213 else 5214 sk = __udp4_lib_lookup(net, src4, tuple->ipv4.sport, 5215 dst4, tuple->ipv4.dport, 5216 dif, sdif, &udp_table, NULL); 5217 #if IS_ENABLED(CONFIG_IPV6) 5218 } else { 5219 struct in6_addr *src6 = (struct in6_addr *)&tuple->ipv6.saddr; 5220 struct in6_addr *dst6 = (struct in6_addr *)&tuple->ipv6.daddr; 5221 5222 if (proto == IPPROTO_TCP) 5223 sk = __inet6_lookup(net, &tcp_hashinfo, NULL, 0, 5224 src6, tuple->ipv6.sport, 5225 dst6, ntohs(tuple->ipv6.dport), 5226 dif, sdif, &refcounted); 5227 else if (likely(ipv6_bpf_stub)) 5228 sk = ipv6_bpf_stub->udp6_lib_lookup(net, 5229 src6, tuple->ipv6.sport, 5230 dst6, tuple->ipv6.dport, 5231 dif, sdif, 5232 &udp_table, NULL); 5233 #endif 5234 } 5235 5236 if (unlikely(sk && !refcounted && !sock_flag(sk, SOCK_RCU_FREE))) { 5237 WARN_ONCE(1, "Found non-RCU, unreferenced socket!"); 5238 sk = NULL; 5239 } 5240 return sk; 5241 } 5242 5243 /* bpf_skc_lookup performs the core lookup for different types of sockets, 5244 * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE. 5245 * Returns the socket as an 'unsigned long' to simplify the casting in the 5246 * callers to satisfy BPF_CALL declarations. 5247 */ 5248 static struct sock * 5249 __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 5250 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, 5251 u64 flags) 5252 { 5253 struct sock *sk = NULL; 5254 u8 family = AF_UNSPEC; 5255 struct net *net; 5256 int sdif; 5257 5258 if (len == sizeof(tuple->ipv4)) 5259 family = AF_INET; 5260 else if (len == sizeof(tuple->ipv6)) 5261 family = AF_INET6; 5262 else 5263 return NULL; 5264 5265 if (unlikely(family == AF_UNSPEC || flags || 5266 !((s32)netns_id < 0 || netns_id <= S32_MAX))) 5267 goto out; 5268 5269 if (family == AF_INET) 5270 sdif = inet_sdif(skb); 5271 else 5272 sdif = inet6_sdif(skb); 5273 5274 if ((s32)netns_id < 0) { 5275 net = caller_net; 5276 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); 5277 } else { 5278 net = get_net_ns_by_id(caller_net, netns_id); 5279 if (unlikely(!net)) 5280 goto out; 5281 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); 5282 put_net(net); 5283 } 5284 5285 out: 5286 return sk; 5287 } 5288 5289 static struct sock * 5290 __bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 5291 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, 5292 u64 flags) 5293 { 5294 struct sock *sk = __bpf_skc_lookup(skb, tuple, len, caller_net, 5295 ifindex, proto, netns_id, flags); 5296 5297 if (sk) { 5298 sk = sk_to_full_sk(sk); 5299 if (!sk_fullsock(sk)) { 5300 if (!sock_flag(sk, SOCK_RCU_FREE)) 5301 sock_gen_put(sk); 5302 return NULL; 5303 } 5304 } 5305 5306 return sk; 5307 } 5308 5309 static struct sock * 5310 bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 5311 u8 proto, u64 netns_id, u64 flags) 5312 { 5313 struct net *caller_net; 5314 int ifindex; 5315 5316 if (skb->dev) { 5317 caller_net = dev_net(skb->dev); 5318 ifindex = skb->dev->ifindex; 5319 } else { 5320 caller_net = sock_net(skb->sk); 5321 ifindex = 0; 5322 } 5323 5324 return __bpf_skc_lookup(skb, tuple, len, caller_net, ifindex, proto, 5325 netns_id, flags); 5326 } 5327 5328 static struct sock * 5329 bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 5330 u8 proto, u64 netns_id, u64 flags) 5331 { 5332 struct sock *sk = bpf_skc_lookup(skb, tuple, len, proto, netns_id, 5333 flags); 5334 5335 if (sk) { 5336 sk = sk_to_full_sk(sk); 5337 if (!sk_fullsock(sk)) { 5338 if (!sock_flag(sk, SOCK_RCU_FREE)) 5339 sock_gen_put(sk); 5340 return NULL; 5341 } 5342 } 5343 5344 return sk; 5345 } 5346 5347 BPF_CALL_5(bpf_skc_lookup_tcp, struct sk_buff *, skb, 5348 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 5349 { 5350 return (unsigned long)bpf_skc_lookup(skb, tuple, len, IPPROTO_TCP, 5351 netns_id, flags); 5352 } 5353 5354 static const struct bpf_func_proto bpf_skc_lookup_tcp_proto = { 5355 .func = bpf_skc_lookup_tcp, 5356 .gpl_only = false, 5357 .pkt_access = true, 5358 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 5359 .arg1_type = ARG_PTR_TO_CTX, 5360 .arg2_type = ARG_PTR_TO_MEM, 5361 .arg3_type = ARG_CONST_SIZE, 5362 .arg4_type = ARG_ANYTHING, 5363 .arg5_type = ARG_ANYTHING, 5364 }; 5365 5366 BPF_CALL_5(bpf_sk_lookup_tcp, struct sk_buff *, skb, 5367 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 5368 { 5369 return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP, 5370 netns_id, flags); 5371 } 5372 5373 static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = { 5374 .func = bpf_sk_lookup_tcp, 5375 .gpl_only = false, 5376 .pkt_access = true, 5377 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5378 .arg1_type = ARG_PTR_TO_CTX, 5379 .arg2_type = ARG_PTR_TO_MEM, 5380 .arg3_type = ARG_CONST_SIZE, 5381 .arg4_type = ARG_ANYTHING, 5382 .arg5_type = ARG_ANYTHING, 5383 }; 5384 5385 BPF_CALL_5(bpf_sk_lookup_udp, struct sk_buff *, skb, 5386 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 5387 { 5388 return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP, 5389 netns_id, flags); 5390 } 5391 5392 static const struct bpf_func_proto bpf_sk_lookup_udp_proto = { 5393 .func = bpf_sk_lookup_udp, 5394 .gpl_only = false, 5395 .pkt_access = true, 5396 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5397 .arg1_type = ARG_PTR_TO_CTX, 5398 .arg2_type = ARG_PTR_TO_MEM, 5399 .arg3_type = ARG_CONST_SIZE, 5400 .arg4_type = ARG_ANYTHING, 5401 .arg5_type = ARG_ANYTHING, 5402 }; 5403 5404 BPF_CALL_1(bpf_sk_release, struct sock *, sk) 5405 { 5406 if (!sock_flag(sk, SOCK_RCU_FREE)) 5407 sock_gen_put(sk); 5408 return 0; 5409 } 5410 5411 static const struct bpf_func_proto bpf_sk_release_proto = { 5412 .func = bpf_sk_release, 5413 .gpl_only = false, 5414 .ret_type = RET_INTEGER, 5415 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 5416 }; 5417 5418 BPF_CALL_5(bpf_xdp_sk_lookup_udp, struct xdp_buff *, ctx, 5419 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 5420 { 5421 struct net *caller_net = dev_net(ctx->rxq->dev); 5422 int ifindex = ctx->rxq->dev->ifindex; 5423 5424 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, 5425 ifindex, IPPROTO_UDP, netns_id, 5426 flags); 5427 } 5428 5429 static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = { 5430 .func = bpf_xdp_sk_lookup_udp, 5431 .gpl_only = false, 5432 .pkt_access = true, 5433 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5434 .arg1_type = ARG_PTR_TO_CTX, 5435 .arg2_type = ARG_PTR_TO_MEM, 5436 .arg3_type = ARG_CONST_SIZE, 5437 .arg4_type = ARG_ANYTHING, 5438 .arg5_type = ARG_ANYTHING, 5439 }; 5440 5441 BPF_CALL_5(bpf_xdp_skc_lookup_tcp, struct xdp_buff *, ctx, 5442 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 5443 { 5444 struct net *caller_net = dev_net(ctx->rxq->dev); 5445 int ifindex = ctx->rxq->dev->ifindex; 5446 5447 return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, caller_net, 5448 ifindex, IPPROTO_TCP, netns_id, 5449 flags); 5450 } 5451 5452 static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto = { 5453 .func = bpf_xdp_skc_lookup_tcp, 5454 .gpl_only = false, 5455 .pkt_access = true, 5456 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 5457 .arg1_type = ARG_PTR_TO_CTX, 5458 .arg2_type = ARG_PTR_TO_MEM, 5459 .arg3_type = ARG_CONST_SIZE, 5460 .arg4_type = ARG_ANYTHING, 5461 .arg5_type = ARG_ANYTHING, 5462 }; 5463 5464 BPF_CALL_5(bpf_xdp_sk_lookup_tcp, struct xdp_buff *, ctx, 5465 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 5466 { 5467 struct net *caller_net = dev_net(ctx->rxq->dev); 5468 int ifindex = ctx->rxq->dev->ifindex; 5469 5470 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, 5471 ifindex, IPPROTO_TCP, netns_id, 5472 flags); 5473 } 5474 5475 static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = { 5476 .func = bpf_xdp_sk_lookup_tcp, 5477 .gpl_only = false, 5478 .pkt_access = true, 5479 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5480 .arg1_type = ARG_PTR_TO_CTX, 5481 .arg2_type = ARG_PTR_TO_MEM, 5482 .arg3_type = ARG_CONST_SIZE, 5483 .arg4_type = ARG_ANYTHING, 5484 .arg5_type = ARG_ANYTHING, 5485 }; 5486 5487 BPF_CALL_5(bpf_sock_addr_skc_lookup_tcp, struct bpf_sock_addr_kern *, ctx, 5488 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 5489 { 5490 return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, 5491 sock_net(ctx->sk), 0, 5492 IPPROTO_TCP, netns_id, flags); 5493 } 5494 5495 static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto = { 5496 .func = bpf_sock_addr_skc_lookup_tcp, 5497 .gpl_only = false, 5498 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 5499 .arg1_type = ARG_PTR_TO_CTX, 5500 .arg2_type = ARG_PTR_TO_MEM, 5501 .arg3_type = ARG_CONST_SIZE, 5502 .arg4_type = ARG_ANYTHING, 5503 .arg5_type = ARG_ANYTHING, 5504 }; 5505 5506 BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp, struct bpf_sock_addr_kern *, ctx, 5507 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 5508 { 5509 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, 5510 sock_net(ctx->sk), 0, IPPROTO_TCP, 5511 netns_id, flags); 5512 } 5513 5514 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = { 5515 .func = bpf_sock_addr_sk_lookup_tcp, 5516 .gpl_only = false, 5517 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5518 .arg1_type = ARG_PTR_TO_CTX, 5519 .arg2_type = ARG_PTR_TO_MEM, 5520 .arg3_type = ARG_CONST_SIZE, 5521 .arg4_type = ARG_ANYTHING, 5522 .arg5_type = ARG_ANYTHING, 5523 }; 5524 5525 BPF_CALL_5(bpf_sock_addr_sk_lookup_udp, struct bpf_sock_addr_kern *, ctx, 5526 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 5527 { 5528 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, 5529 sock_net(ctx->sk), 0, IPPROTO_UDP, 5530 netns_id, flags); 5531 } 5532 5533 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = { 5534 .func = bpf_sock_addr_sk_lookup_udp, 5535 .gpl_only = false, 5536 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5537 .arg1_type = ARG_PTR_TO_CTX, 5538 .arg2_type = ARG_PTR_TO_MEM, 5539 .arg3_type = ARG_CONST_SIZE, 5540 .arg4_type = ARG_ANYTHING, 5541 .arg5_type = ARG_ANYTHING, 5542 }; 5543 5544 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 5545 struct bpf_insn_access_aux *info) 5546 { 5547 if (off < 0 || off >= offsetofend(struct bpf_tcp_sock, 5548 icsk_retransmits)) 5549 return false; 5550 5551 if (off % size != 0) 5552 return false; 5553 5554 switch (off) { 5555 case offsetof(struct bpf_tcp_sock, bytes_received): 5556 case offsetof(struct bpf_tcp_sock, bytes_acked): 5557 return size == sizeof(__u64); 5558 default: 5559 return size == sizeof(__u32); 5560 } 5561 } 5562 5563 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 5564 const struct bpf_insn *si, 5565 struct bpf_insn *insn_buf, 5566 struct bpf_prog *prog, u32 *target_size) 5567 { 5568 struct bpf_insn *insn = insn_buf; 5569 5570 #define BPF_TCP_SOCK_GET_COMMON(FIELD) \ 5571 do { \ 5572 BUILD_BUG_ON(FIELD_SIZEOF(struct tcp_sock, FIELD) > \ 5573 FIELD_SIZEOF(struct bpf_tcp_sock, FIELD)); \ 5574 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_sock, FIELD),\ 5575 si->dst_reg, si->src_reg, \ 5576 offsetof(struct tcp_sock, FIELD)); \ 5577 } while (0) 5578 5579 #define BPF_INET_SOCK_GET_COMMON(FIELD) \ 5580 do { \ 5581 BUILD_BUG_ON(FIELD_SIZEOF(struct inet_connection_sock, \ 5582 FIELD) > \ 5583 FIELD_SIZEOF(struct bpf_tcp_sock, FIELD)); \ 5584 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 5585 struct inet_connection_sock, \ 5586 FIELD), \ 5587 si->dst_reg, si->src_reg, \ 5588 offsetof( \ 5589 struct inet_connection_sock, \ 5590 FIELD)); \ 5591 } while (0) 5592 5593 if (insn > insn_buf) 5594 return insn - insn_buf; 5595 5596 switch (si->off) { 5597 case offsetof(struct bpf_tcp_sock, rtt_min): 5598 BUILD_BUG_ON(FIELD_SIZEOF(struct tcp_sock, rtt_min) != 5599 sizeof(struct minmax)); 5600 BUILD_BUG_ON(sizeof(struct minmax) < 5601 sizeof(struct minmax_sample)); 5602 5603 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 5604 offsetof(struct tcp_sock, rtt_min) + 5605 offsetof(struct minmax_sample, v)); 5606 break; 5607 case offsetof(struct bpf_tcp_sock, snd_cwnd): 5608 BPF_TCP_SOCK_GET_COMMON(snd_cwnd); 5609 break; 5610 case offsetof(struct bpf_tcp_sock, srtt_us): 5611 BPF_TCP_SOCK_GET_COMMON(srtt_us); 5612 break; 5613 case offsetof(struct bpf_tcp_sock, snd_ssthresh): 5614 BPF_TCP_SOCK_GET_COMMON(snd_ssthresh); 5615 break; 5616 case offsetof(struct bpf_tcp_sock, rcv_nxt): 5617 BPF_TCP_SOCK_GET_COMMON(rcv_nxt); 5618 break; 5619 case offsetof(struct bpf_tcp_sock, snd_nxt): 5620 BPF_TCP_SOCK_GET_COMMON(snd_nxt); 5621 break; 5622 case offsetof(struct bpf_tcp_sock, snd_una): 5623 BPF_TCP_SOCK_GET_COMMON(snd_una); 5624 break; 5625 case offsetof(struct bpf_tcp_sock, mss_cache): 5626 BPF_TCP_SOCK_GET_COMMON(mss_cache); 5627 break; 5628 case offsetof(struct bpf_tcp_sock, ecn_flags): 5629 BPF_TCP_SOCK_GET_COMMON(ecn_flags); 5630 break; 5631 case offsetof(struct bpf_tcp_sock, rate_delivered): 5632 BPF_TCP_SOCK_GET_COMMON(rate_delivered); 5633 break; 5634 case offsetof(struct bpf_tcp_sock, rate_interval_us): 5635 BPF_TCP_SOCK_GET_COMMON(rate_interval_us); 5636 break; 5637 case offsetof(struct bpf_tcp_sock, packets_out): 5638 BPF_TCP_SOCK_GET_COMMON(packets_out); 5639 break; 5640 case offsetof(struct bpf_tcp_sock, retrans_out): 5641 BPF_TCP_SOCK_GET_COMMON(retrans_out); 5642 break; 5643 case offsetof(struct bpf_tcp_sock, total_retrans): 5644 BPF_TCP_SOCK_GET_COMMON(total_retrans); 5645 break; 5646 case offsetof(struct bpf_tcp_sock, segs_in): 5647 BPF_TCP_SOCK_GET_COMMON(segs_in); 5648 break; 5649 case offsetof(struct bpf_tcp_sock, data_segs_in): 5650 BPF_TCP_SOCK_GET_COMMON(data_segs_in); 5651 break; 5652 case offsetof(struct bpf_tcp_sock, segs_out): 5653 BPF_TCP_SOCK_GET_COMMON(segs_out); 5654 break; 5655 case offsetof(struct bpf_tcp_sock, data_segs_out): 5656 BPF_TCP_SOCK_GET_COMMON(data_segs_out); 5657 break; 5658 case offsetof(struct bpf_tcp_sock, lost_out): 5659 BPF_TCP_SOCK_GET_COMMON(lost_out); 5660 break; 5661 case offsetof(struct bpf_tcp_sock, sacked_out): 5662 BPF_TCP_SOCK_GET_COMMON(sacked_out); 5663 break; 5664 case offsetof(struct bpf_tcp_sock, bytes_received): 5665 BPF_TCP_SOCK_GET_COMMON(bytes_received); 5666 break; 5667 case offsetof(struct bpf_tcp_sock, bytes_acked): 5668 BPF_TCP_SOCK_GET_COMMON(bytes_acked); 5669 break; 5670 case offsetof(struct bpf_tcp_sock, dsack_dups): 5671 BPF_TCP_SOCK_GET_COMMON(dsack_dups); 5672 break; 5673 case offsetof(struct bpf_tcp_sock, delivered): 5674 BPF_TCP_SOCK_GET_COMMON(delivered); 5675 break; 5676 case offsetof(struct bpf_tcp_sock, delivered_ce): 5677 BPF_TCP_SOCK_GET_COMMON(delivered_ce); 5678 break; 5679 case offsetof(struct bpf_tcp_sock, icsk_retransmits): 5680 BPF_INET_SOCK_GET_COMMON(icsk_retransmits); 5681 break; 5682 } 5683 5684 return insn - insn_buf; 5685 } 5686 5687 BPF_CALL_1(bpf_tcp_sock, struct sock *, sk) 5688 { 5689 if (sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP) 5690 return (unsigned long)sk; 5691 5692 return (unsigned long)NULL; 5693 } 5694 5695 const struct bpf_func_proto bpf_tcp_sock_proto = { 5696 .func = bpf_tcp_sock, 5697 .gpl_only = false, 5698 .ret_type = RET_PTR_TO_TCP_SOCK_OR_NULL, 5699 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 5700 }; 5701 5702 BPF_CALL_1(bpf_get_listener_sock, struct sock *, sk) 5703 { 5704 sk = sk_to_full_sk(sk); 5705 5706 if (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_RCU_FREE)) 5707 return (unsigned long)sk; 5708 5709 return (unsigned long)NULL; 5710 } 5711 5712 static const struct bpf_func_proto bpf_get_listener_sock_proto = { 5713 .func = bpf_get_listener_sock, 5714 .gpl_only = false, 5715 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 5716 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 5717 }; 5718 5719 BPF_CALL_1(bpf_skb_ecn_set_ce, struct sk_buff *, skb) 5720 { 5721 unsigned int iphdr_len; 5722 5723 if (skb->protocol == cpu_to_be16(ETH_P_IP)) 5724 iphdr_len = sizeof(struct iphdr); 5725 else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) 5726 iphdr_len = sizeof(struct ipv6hdr); 5727 else 5728 return 0; 5729 5730 if (skb_headlen(skb) < iphdr_len) 5731 return 0; 5732 5733 if (skb_cloned(skb) && !skb_clone_writable(skb, iphdr_len)) 5734 return 0; 5735 5736 return INET_ECN_set_ce(skb); 5737 } 5738 5739 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 5740 struct bpf_insn_access_aux *info) 5741 { 5742 if (off < 0 || off >= offsetofend(struct bpf_xdp_sock, queue_id)) 5743 return false; 5744 5745 if (off % size != 0) 5746 return false; 5747 5748 switch (off) { 5749 default: 5750 return size == sizeof(__u32); 5751 } 5752 } 5753 5754 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 5755 const struct bpf_insn *si, 5756 struct bpf_insn *insn_buf, 5757 struct bpf_prog *prog, u32 *target_size) 5758 { 5759 struct bpf_insn *insn = insn_buf; 5760 5761 #define BPF_XDP_SOCK_GET(FIELD) \ 5762 do { \ 5763 BUILD_BUG_ON(FIELD_SIZEOF(struct xdp_sock, FIELD) > \ 5764 FIELD_SIZEOF(struct bpf_xdp_sock, FIELD)); \ 5765 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_sock, FIELD),\ 5766 si->dst_reg, si->src_reg, \ 5767 offsetof(struct xdp_sock, FIELD)); \ 5768 } while (0) 5769 5770 switch (si->off) { 5771 case offsetof(struct bpf_xdp_sock, queue_id): 5772 BPF_XDP_SOCK_GET(queue_id); 5773 break; 5774 } 5775 5776 return insn - insn_buf; 5777 } 5778 5779 static const struct bpf_func_proto bpf_skb_ecn_set_ce_proto = { 5780 .func = bpf_skb_ecn_set_ce, 5781 .gpl_only = false, 5782 .ret_type = RET_INTEGER, 5783 .arg1_type = ARG_PTR_TO_CTX, 5784 }; 5785 5786 BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len, 5787 struct tcphdr *, th, u32, th_len) 5788 { 5789 #ifdef CONFIG_SYN_COOKIES 5790 u32 cookie; 5791 int ret; 5792 5793 if (unlikely(th_len < sizeof(*th))) 5794 return -EINVAL; 5795 5796 /* sk_listener() allows TCP_NEW_SYN_RECV, which makes no sense here. */ 5797 if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN) 5798 return -EINVAL; 5799 5800 if (!sock_net(sk)->ipv4.sysctl_tcp_syncookies) 5801 return -EINVAL; 5802 5803 if (!th->ack || th->rst || th->syn) 5804 return -ENOENT; 5805 5806 if (tcp_synq_no_recent_overflow(sk)) 5807 return -ENOENT; 5808 5809 cookie = ntohl(th->ack_seq) - 1; 5810 5811 switch (sk->sk_family) { 5812 case AF_INET: 5813 if (unlikely(iph_len < sizeof(struct iphdr))) 5814 return -EINVAL; 5815 5816 ret = __cookie_v4_check((struct iphdr *)iph, th, cookie); 5817 break; 5818 5819 #if IS_BUILTIN(CONFIG_IPV6) 5820 case AF_INET6: 5821 if (unlikely(iph_len < sizeof(struct ipv6hdr))) 5822 return -EINVAL; 5823 5824 ret = __cookie_v6_check((struct ipv6hdr *)iph, th, cookie); 5825 break; 5826 #endif /* CONFIG_IPV6 */ 5827 5828 default: 5829 return -EPROTONOSUPPORT; 5830 } 5831 5832 if (ret > 0) 5833 return 0; 5834 5835 return -ENOENT; 5836 #else 5837 return -ENOTSUPP; 5838 #endif 5839 } 5840 5841 static const struct bpf_func_proto bpf_tcp_check_syncookie_proto = { 5842 .func = bpf_tcp_check_syncookie, 5843 .gpl_only = true, 5844 .pkt_access = true, 5845 .ret_type = RET_INTEGER, 5846 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 5847 .arg2_type = ARG_PTR_TO_MEM, 5848 .arg3_type = ARG_CONST_SIZE, 5849 .arg4_type = ARG_PTR_TO_MEM, 5850 .arg5_type = ARG_CONST_SIZE, 5851 }; 5852 5853 #endif /* CONFIG_INET */ 5854 5855 bool bpf_helper_changes_pkt_data(void *func) 5856 { 5857 if (func == bpf_skb_vlan_push || 5858 func == bpf_skb_vlan_pop || 5859 func == bpf_skb_store_bytes || 5860 func == bpf_skb_change_proto || 5861 func == bpf_skb_change_head || 5862 func == sk_skb_change_head || 5863 func == bpf_skb_change_tail || 5864 func == sk_skb_change_tail || 5865 func == bpf_skb_adjust_room || 5866 func == bpf_skb_pull_data || 5867 func == sk_skb_pull_data || 5868 func == bpf_clone_redirect || 5869 func == bpf_l3_csum_replace || 5870 func == bpf_l4_csum_replace || 5871 func == bpf_xdp_adjust_head || 5872 func == bpf_xdp_adjust_meta || 5873 func == bpf_msg_pull_data || 5874 func == bpf_msg_push_data || 5875 func == bpf_msg_pop_data || 5876 func == bpf_xdp_adjust_tail || 5877 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 5878 func == bpf_lwt_seg6_store_bytes || 5879 func == bpf_lwt_seg6_adjust_srh || 5880 func == bpf_lwt_seg6_action || 5881 #endif 5882 func == bpf_lwt_in_push_encap || 5883 func == bpf_lwt_xmit_push_encap) 5884 return true; 5885 5886 return false; 5887 } 5888 5889 static const struct bpf_func_proto * 5890 bpf_base_func_proto(enum bpf_func_id func_id) 5891 { 5892 switch (func_id) { 5893 case BPF_FUNC_map_lookup_elem: 5894 return &bpf_map_lookup_elem_proto; 5895 case BPF_FUNC_map_update_elem: 5896 return &bpf_map_update_elem_proto; 5897 case BPF_FUNC_map_delete_elem: 5898 return &bpf_map_delete_elem_proto; 5899 case BPF_FUNC_map_push_elem: 5900 return &bpf_map_push_elem_proto; 5901 case BPF_FUNC_map_pop_elem: 5902 return &bpf_map_pop_elem_proto; 5903 case BPF_FUNC_map_peek_elem: 5904 return &bpf_map_peek_elem_proto; 5905 case BPF_FUNC_get_prandom_u32: 5906 return &bpf_get_prandom_u32_proto; 5907 case BPF_FUNC_get_smp_processor_id: 5908 return &bpf_get_raw_smp_processor_id_proto; 5909 case BPF_FUNC_get_numa_node_id: 5910 return &bpf_get_numa_node_id_proto; 5911 case BPF_FUNC_tail_call: 5912 return &bpf_tail_call_proto; 5913 case BPF_FUNC_ktime_get_ns: 5914 return &bpf_ktime_get_ns_proto; 5915 default: 5916 break; 5917 } 5918 5919 if (!capable(CAP_SYS_ADMIN)) 5920 return NULL; 5921 5922 switch (func_id) { 5923 case BPF_FUNC_spin_lock: 5924 return &bpf_spin_lock_proto; 5925 case BPF_FUNC_spin_unlock: 5926 return &bpf_spin_unlock_proto; 5927 case BPF_FUNC_trace_printk: 5928 return bpf_get_trace_printk_proto(); 5929 default: 5930 return NULL; 5931 } 5932 } 5933 5934 static const struct bpf_func_proto * 5935 sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 5936 { 5937 switch (func_id) { 5938 /* inet and inet6 sockets are created in a process 5939 * context so there is always a valid uid/gid 5940 */ 5941 case BPF_FUNC_get_current_uid_gid: 5942 return &bpf_get_current_uid_gid_proto; 5943 case BPF_FUNC_get_local_storage: 5944 return &bpf_get_local_storage_proto; 5945 default: 5946 return bpf_base_func_proto(func_id); 5947 } 5948 } 5949 5950 static const struct bpf_func_proto * 5951 sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 5952 { 5953 switch (func_id) { 5954 /* inet and inet6 sockets are created in a process 5955 * context so there is always a valid uid/gid 5956 */ 5957 case BPF_FUNC_get_current_uid_gid: 5958 return &bpf_get_current_uid_gid_proto; 5959 case BPF_FUNC_bind: 5960 switch (prog->expected_attach_type) { 5961 case BPF_CGROUP_INET4_CONNECT: 5962 case BPF_CGROUP_INET6_CONNECT: 5963 return &bpf_bind_proto; 5964 default: 5965 return NULL; 5966 } 5967 case BPF_FUNC_get_socket_cookie: 5968 return &bpf_get_socket_cookie_sock_addr_proto; 5969 case BPF_FUNC_get_local_storage: 5970 return &bpf_get_local_storage_proto; 5971 #ifdef CONFIG_INET 5972 case BPF_FUNC_sk_lookup_tcp: 5973 return &bpf_sock_addr_sk_lookup_tcp_proto; 5974 case BPF_FUNC_sk_lookup_udp: 5975 return &bpf_sock_addr_sk_lookup_udp_proto; 5976 case BPF_FUNC_sk_release: 5977 return &bpf_sk_release_proto; 5978 case BPF_FUNC_skc_lookup_tcp: 5979 return &bpf_sock_addr_skc_lookup_tcp_proto; 5980 #endif /* CONFIG_INET */ 5981 case BPF_FUNC_sk_storage_get: 5982 return &bpf_sk_storage_get_proto; 5983 case BPF_FUNC_sk_storage_delete: 5984 return &bpf_sk_storage_delete_proto; 5985 default: 5986 return bpf_base_func_proto(func_id); 5987 } 5988 } 5989 5990 static const struct bpf_func_proto * 5991 sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 5992 { 5993 switch (func_id) { 5994 case BPF_FUNC_skb_load_bytes: 5995 return &bpf_skb_load_bytes_proto; 5996 case BPF_FUNC_skb_load_bytes_relative: 5997 return &bpf_skb_load_bytes_relative_proto; 5998 case BPF_FUNC_get_socket_cookie: 5999 return &bpf_get_socket_cookie_proto; 6000 case BPF_FUNC_get_socket_uid: 6001 return &bpf_get_socket_uid_proto; 6002 default: 6003 return bpf_base_func_proto(func_id); 6004 } 6005 } 6006 6007 const struct bpf_func_proto bpf_sk_storage_get_proto __weak; 6008 const struct bpf_func_proto bpf_sk_storage_delete_proto __weak; 6009 6010 static const struct bpf_func_proto * 6011 cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6012 { 6013 switch (func_id) { 6014 case BPF_FUNC_get_local_storage: 6015 return &bpf_get_local_storage_proto; 6016 case BPF_FUNC_sk_fullsock: 6017 return &bpf_sk_fullsock_proto; 6018 case BPF_FUNC_sk_storage_get: 6019 return &bpf_sk_storage_get_proto; 6020 case BPF_FUNC_sk_storage_delete: 6021 return &bpf_sk_storage_delete_proto; 6022 #ifdef CONFIG_SOCK_CGROUP_DATA 6023 case BPF_FUNC_skb_cgroup_id: 6024 return &bpf_skb_cgroup_id_proto; 6025 #endif 6026 #ifdef CONFIG_INET 6027 case BPF_FUNC_tcp_sock: 6028 return &bpf_tcp_sock_proto; 6029 case BPF_FUNC_get_listener_sock: 6030 return &bpf_get_listener_sock_proto; 6031 case BPF_FUNC_skb_ecn_set_ce: 6032 return &bpf_skb_ecn_set_ce_proto; 6033 #endif 6034 default: 6035 return sk_filter_func_proto(func_id, prog); 6036 } 6037 } 6038 6039 static const struct bpf_func_proto * 6040 tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6041 { 6042 switch (func_id) { 6043 case BPF_FUNC_skb_store_bytes: 6044 return &bpf_skb_store_bytes_proto; 6045 case BPF_FUNC_skb_load_bytes: 6046 return &bpf_skb_load_bytes_proto; 6047 case BPF_FUNC_skb_load_bytes_relative: 6048 return &bpf_skb_load_bytes_relative_proto; 6049 case BPF_FUNC_skb_pull_data: 6050 return &bpf_skb_pull_data_proto; 6051 case BPF_FUNC_csum_diff: 6052 return &bpf_csum_diff_proto; 6053 case BPF_FUNC_csum_update: 6054 return &bpf_csum_update_proto; 6055 case BPF_FUNC_l3_csum_replace: 6056 return &bpf_l3_csum_replace_proto; 6057 case BPF_FUNC_l4_csum_replace: 6058 return &bpf_l4_csum_replace_proto; 6059 case BPF_FUNC_clone_redirect: 6060 return &bpf_clone_redirect_proto; 6061 case BPF_FUNC_get_cgroup_classid: 6062 return &bpf_get_cgroup_classid_proto; 6063 case BPF_FUNC_skb_vlan_push: 6064 return &bpf_skb_vlan_push_proto; 6065 case BPF_FUNC_skb_vlan_pop: 6066 return &bpf_skb_vlan_pop_proto; 6067 case BPF_FUNC_skb_change_proto: 6068 return &bpf_skb_change_proto_proto; 6069 case BPF_FUNC_skb_change_type: 6070 return &bpf_skb_change_type_proto; 6071 case BPF_FUNC_skb_adjust_room: 6072 return &bpf_skb_adjust_room_proto; 6073 case BPF_FUNC_skb_change_tail: 6074 return &bpf_skb_change_tail_proto; 6075 case BPF_FUNC_skb_get_tunnel_key: 6076 return &bpf_skb_get_tunnel_key_proto; 6077 case BPF_FUNC_skb_set_tunnel_key: 6078 return bpf_get_skb_set_tunnel_proto(func_id); 6079 case BPF_FUNC_skb_get_tunnel_opt: 6080 return &bpf_skb_get_tunnel_opt_proto; 6081 case BPF_FUNC_skb_set_tunnel_opt: 6082 return bpf_get_skb_set_tunnel_proto(func_id); 6083 case BPF_FUNC_redirect: 6084 return &bpf_redirect_proto; 6085 case BPF_FUNC_get_route_realm: 6086 return &bpf_get_route_realm_proto; 6087 case BPF_FUNC_get_hash_recalc: 6088 return &bpf_get_hash_recalc_proto; 6089 case BPF_FUNC_set_hash_invalid: 6090 return &bpf_set_hash_invalid_proto; 6091 case BPF_FUNC_set_hash: 6092 return &bpf_set_hash_proto; 6093 case BPF_FUNC_perf_event_output: 6094 return &bpf_skb_event_output_proto; 6095 case BPF_FUNC_get_smp_processor_id: 6096 return &bpf_get_smp_processor_id_proto; 6097 case BPF_FUNC_skb_under_cgroup: 6098 return &bpf_skb_under_cgroup_proto; 6099 case BPF_FUNC_get_socket_cookie: 6100 return &bpf_get_socket_cookie_proto; 6101 case BPF_FUNC_get_socket_uid: 6102 return &bpf_get_socket_uid_proto; 6103 case BPF_FUNC_fib_lookup: 6104 return &bpf_skb_fib_lookup_proto; 6105 case BPF_FUNC_sk_fullsock: 6106 return &bpf_sk_fullsock_proto; 6107 case BPF_FUNC_sk_storage_get: 6108 return &bpf_sk_storage_get_proto; 6109 case BPF_FUNC_sk_storage_delete: 6110 return &bpf_sk_storage_delete_proto; 6111 #ifdef CONFIG_XFRM 6112 case BPF_FUNC_skb_get_xfrm_state: 6113 return &bpf_skb_get_xfrm_state_proto; 6114 #endif 6115 #ifdef CONFIG_SOCK_CGROUP_DATA 6116 case BPF_FUNC_skb_cgroup_id: 6117 return &bpf_skb_cgroup_id_proto; 6118 case BPF_FUNC_skb_ancestor_cgroup_id: 6119 return &bpf_skb_ancestor_cgroup_id_proto; 6120 #endif 6121 #ifdef CONFIG_INET 6122 case BPF_FUNC_sk_lookup_tcp: 6123 return &bpf_sk_lookup_tcp_proto; 6124 case BPF_FUNC_sk_lookup_udp: 6125 return &bpf_sk_lookup_udp_proto; 6126 case BPF_FUNC_sk_release: 6127 return &bpf_sk_release_proto; 6128 case BPF_FUNC_tcp_sock: 6129 return &bpf_tcp_sock_proto; 6130 case BPF_FUNC_get_listener_sock: 6131 return &bpf_get_listener_sock_proto; 6132 case BPF_FUNC_skc_lookup_tcp: 6133 return &bpf_skc_lookup_tcp_proto; 6134 case BPF_FUNC_tcp_check_syncookie: 6135 return &bpf_tcp_check_syncookie_proto; 6136 case BPF_FUNC_skb_ecn_set_ce: 6137 return &bpf_skb_ecn_set_ce_proto; 6138 #endif 6139 default: 6140 return bpf_base_func_proto(func_id); 6141 } 6142 } 6143 6144 static const struct bpf_func_proto * 6145 xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6146 { 6147 switch (func_id) { 6148 case BPF_FUNC_perf_event_output: 6149 return &bpf_xdp_event_output_proto; 6150 case BPF_FUNC_get_smp_processor_id: 6151 return &bpf_get_smp_processor_id_proto; 6152 case BPF_FUNC_csum_diff: 6153 return &bpf_csum_diff_proto; 6154 case BPF_FUNC_xdp_adjust_head: 6155 return &bpf_xdp_adjust_head_proto; 6156 case BPF_FUNC_xdp_adjust_meta: 6157 return &bpf_xdp_adjust_meta_proto; 6158 case BPF_FUNC_redirect: 6159 return &bpf_xdp_redirect_proto; 6160 case BPF_FUNC_redirect_map: 6161 return &bpf_xdp_redirect_map_proto; 6162 case BPF_FUNC_xdp_adjust_tail: 6163 return &bpf_xdp_adjust_tail_proto; 6164 case BPF_FUNC_fib_lookup: 6165 return &bpf_xdp_fib_lookup_proto; 6166 #ifdef CONFIG_INET 6167 case BPF_FUNC_sk_lookup_udp: 6168 return &bpf_xdp_sk_lookup_udp_proto; 6169 case BPF_FUNC_sk_lookup_tcp: 6170 return &bpf_xdp_sk_lookup_tcp_proto; 6171 case BPF_FUNC_sk_release: 6172 return &bpf_sk_release_proto; 6173 case BPF_FUNC_skc_lookup_tcp: 6174 return &bpf_xdp_skc_lookup_tcp_proto; 6175 case BPF_FUNC_tcp_check_syncookie: 6176 return &bpf_tcp_check_syncookie_proto; 6177 #endif 6178 default: 6179 return bpf_base_func_proto(func_id); 6180 } 6181 } 6182 6183 const struct bpf_func_proto bpf_sock_map_update_proto __weak; 6184 const struct bpf_func_proto bpf_sock_hash_update_proto __weak; 6185 6186 static const struct bpf_func_proto * 6187 sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6188 { 6189 switch (func_id) { 6190 case BPF_FUNC_setsockopt: 6191 return &bpf_setsockopt_proto; 6192 case BPF_FUNC_getsockopt: 6193 return &bpf_getsockopt_proto; 6194 case BPF_FUNC_sock_ops_cb_flags_set: 6195 return &bpf_sock_ops_cb_flags_set_proto; 6196 case BPF_FUNC_sock_map_update: 6197 return &bpf_sock_map_update_proto; 6198 case BPF_FUNC_sock_hash_update: 6199 return &bpf_sock_hash_update_proto; 6200 case BPF_FUNC_get_socket_cookie: 6201 return &bpf_get_socket_cookie_sock_ops_proto; 6202 case BPF_FUNC_get_local_storage: 6203 return &bpf_get_local_storage_proto; 6204 case BPF_FUNC_perf_event_output: 6205 return &bpf_sockopt_event_output_proto; 6206 case BPF_FUNC_sk_storage_get: 6207 return &bpf_sk_storage_get_proto; 6208 case BPF_FUNC_sk_storage_delete: 6209 return &bpf_sk_storage_delete_proto; 6210 #ifdef CONFIG_INET 6211 case BPF_FUNC_tcp_sock: 6212 return &bpf_tcp_sock_proto; 6213 #endif /* CONFIG_INET */ 6214 default: 6215 return bpf_base_func_proto(func_id); 6216 } 6217 } 6218 6219 const struct bpf_func_proto bpf_msg_redirect_map_proto __weak; 6220 const struct bpf_func_proto bpf_msg_redirect_hash_proto __weak; 6221 6222 static const struct bpf_func_proto * 6223 sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6224 { 6225 switch (func_id) { 6226 case BPF_FUNC_msg_redirect_map: 6227 return &bpf_msg_redirect_map_proto; 6228 case BPF_FUNC_msg_redirect_hash: 6229 return &bpf_msg_redirect_hash_proto; 6230 case BPF_FUNC_msg_apply_bytes: 6231 return &bpf_msg_apply_bytes_proto; 6232 case BPF_FUNC_msg_cork_bytes: 6233 return &bpf_msg_cork_bytes_proto; 6234 case BPF_FUNC_msg_pull_data: 6235 return &bpf_msg_pull_data_proto; 6236 case BPF_FUNC_msg_push_data: 6237 return &bpf_msg_push_data_proto; 6238 case BPF_FUNC_msg_pop_data: 6239 return &bpf_msg_pop_data_proto; 6240 default: 6241 return bpf_base_func_proto(func_id); 6242 } 6243 } 6244 6245 const struct bpf_func_proto bpf_sk_redirect_map_proto __weak; 6246 const struct bpf_func_proto bpf_sk_redirect_hash_proto __weak; 6247 6248 static const struct bpf_func_proto * 6249 sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6250 { 6251 switch (func_id) { 6252 case BPF_FUNC_skb_store_bytes: 6253 return &bpf_skb_store_bytes_proto; 6254 case BPF_FUNC_skb_load_bytes: 6255 return &bpf_skb_load_bytes_proto; 6256 case BPF_FUNC_skb_pull_data: 6257 return &sk_skb_pull_data_proto; 6258 case BPF_FUNC_skb_change_tail: 6259 return &sk_skb_change_tail_proto; 6260 case BPF_FUNC_skb_change_head: 6261 return &sk_skb_change_head_proto; 6262 case BPF_FUNC_get_socket_cookie: 6263 return &bpf_get_socket_cookie_proto; 6264 case BPF_FUNC_get_socket_uid: 6265 return &bpf_get_socket_uid_proto; 6266 case BPF_FUNC_sk_redirect_map: 6267 return &bpf_sk_redirect_map_proto; 6268 case BPF_FUNC_sk_redirect_hash: 6269 return &bpf_sk_redirect_hash_proto; 6270 #ifdef CONFIG_INET 6271 case BPF_FUNC_sk_lookup_tcp: 6272 return &bpf_sk_lookup_tcp_proto; 6273 case BPF_FUNC_sk_lookup_udp: 6274 return &bpf_sk_lookup_udp_proto; 6275 case BPF_FUNC_sk_release: 6276 return &bpf_sk_release_proto; 6277 case BPF_FUNC_skc_lookup_tcp: 6278 return &bpf_skc_lookup_tcp_proto; 6279 #endif 6280 default: 6281 return bpf_base_func_proto(func_id); 6282 } 6283 } 6284 6285 static const struct bpf_func_proto * 6286 flow_dissector_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6287 { 6288 switch (func_id) { 6289 case BPF_FUNC_skb_load_bytes: 6290 return &bpf_flow_dissector_load_bytes_proto; 6291 default: 6292 return bpf_base_func_proto(func_id); 6293 } 6294 } 6295 6296 static const struct bpf_func_proto * 6297 lwt_out_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6298 { 6299 switch (func_id) { 6300 case BPF_FUNC_skb_load_bytes: 6301 return &bpf_skb_load_bytes_proto; 6302 case BPF_FUNC_skb_pull_data: 6303 return &bpf_skb_pull_data_proto; 6304 case BPF_FUNC_csum_diff: 6305 return &bpf_csum_diff_proto; 6306 case BPF_FUNC_get_cgroup_classid: 6307 return &bpf_get_cgroup_classid_proto; 6308 case BPF_FUNC_get_route_realm: 6309 return &bpf_get_route_realm_proto; 6310 case BPF_FUNC_get_hash_recalc: 6311 return &bpf_get_hash_recalc_proto; 6312 case BPF_FUNC_perf_event_output: 6313 return &bpf_skb_event_output_proto; 6314 case BPF_FUNC_get_smp_processor_id: 6315 return &bpf_get_smp_processor_id_proto; 6316 case BPF_FUNC_skb_under_cgroup: 6317 return &bpf_skb_under_cgroup_proto; 6318 default: 6319 return bpf_base_func_proto(func_id); 6320 } 6321 } 6322 6323 static const struct bpf_func_proto * 6324 lwt_in_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6325 { 6326 switch (func_id) { 6327 case BPF_FUNC_lwt_push_encap: 6328 return &bpf_lwt_in_push_encap_proto; 6329 default: 6330 return lwt_out_func_proto(func_id, prog); 6331 } 6332 } 6333 6334 static const struct bpf_func_proto * 6335 lwt_xmit_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6336 { 6337 switch (func_id) { 6338 case BPF_FUNC_skb_get_tunnel_key: 6339 return &bpf_skb_get_tunnel_key_proto; 6340 case BPF_FUNC_skb_set_tunnel_key: 6341 return bpf_get_skb_set_tunnel_proto(func_id); 6342 case BPF_FUNC_skb_get_tunnel_opt: 6343 return &bpf_skb_get_tunnel_opt_proto; 6344 case BPF_FUNC_skb_set_tunnel_opt: 6345 return bpf_get_skb_set_tunnel_proto(func_id); 6346 case BPF_FUNC_redirect: 6347 return &bpf_redirect_proto; 6348 case BPF_FUNC_clone_redirect: 6349 return &bpf_clone_redirect_proto; 6350 case BPF_FUNC_skb_change_tail: 6351 return &bpf_skb_change_tail_proto; 6352 case BPF_FUNC_skb_change_head: 6353 return &bpf_skb_change_head_proto; 6354 case BPF_FUNC_skb_store_bytes: 6355 return &bpf_skb_store_bytes_proto; 6356 case BPF_FUNC_csum_update: 6357 return &bpf_csum_update_proto; 6358 case BPF_FUNC_l3_csum_replace: 6359 return &bpf_l3_csum_replace_proto; 6360 case BPF_FUNC_l4_csum_replace: 6361 return &bpf_l4_csum_replace_proto; 6362 case BPF_FUNC_set_hash_invalid: 6363 return &bpf_set_hash_invalid_proto; 6364 case BPF_FUNC_lwt_push_encap: 6365 return &bpf_lwt_xmit_push_encap_proto; 6366 default: 6367 return lwt_out_func_proto(func_id, prog); 6368 } 6369 } 6370 6371 static const struct bpf_func_proto * 6372 lwt_seg6local_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 6373 { 6374 switch (func_id) { 6375 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 6376 case BPF_FUNC_lwt_seg6_store_bytes: 6377 return &bpf_lwt_seg6_store_bytes_proto; 6378 case BPF_FUNC_lwt_seg6_action: 6379 return &bpf_lwt_seg6_action_proto; 6380 case BPF_FUNC_lwt_seg6_adjust_srh: 6381 return &bpf_lwt_seg6_adjust_srh_proto; 6382 #endif 6383 default: 6384 return lwt_out_func_proto(func_id, prog); 6385 } 6386 } 6387 6388 static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type, 6389 const struct bpf_prog *prog, 6390 struct bpf_insn_access_aux *info) 6391 { 6392 const int size_default = sizeof(__u32); 6393 6394 if (off < 0 || off >= sizeof(struct __sk_buff)) 6395 return false; 6396 6397 /* The verifier guarantees that size > 0. */ 6398 if (off % size != 0) 6399 return false; 6400 6401 switch (off) { 6402 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 6403 if (off + size > offsetofend(struct __sk_buff, cb[4])) 6404 return false; 6405 break; 6406 case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]): 6407 case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]): 6408 case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4): 6409 case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4): 6410 case bpf_ctx_range(struct __sk_buff, data): 6411 case bpf_ctx_range(struct __sk_buff, data_meta): 6412 case bpf_ctx_range(struct __sk_buff, data_end): 6413 if (size != size_default) 6414 return false; 6415 break; 6416 case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): 6417 return false; 6418 case bpf_ctx_range(struct __sk_buff, tstamp): 6419 if (size != sizeof(__u64)) 6420 return false; 6421 break; 6422 case offsetof(struct __sk_buff, sk): 6423 if (type == BPF_WRITE || size != sizeof(__u64)) 6424 return false; 6425 info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL; 6426 break; 6427 default: 6428 /* Only narrow read access allowed for now. */ 6429 if (type == BPF_WRITE) { 6430 if (size != size_default) 6431 return false; 6432 } else { 6433 bpf_ctx_record_field_size(info, size_default); 6434 if (!bpf_ctx_narrow_access_ok(off, size, size_default)) 6435 return false; 6436 } 6437 } 6438 6439 return true; 6440 } 6441 6442 static bool sk_filter_is_valid_access(int off, int size, 6443 enum bpf_access_type type, 6444 const struct bpf_prog *prog, 6445 struct bpf_insn_access_aux *info) 6446 { 6447 switch (off) { 6448 case bpf_ctx_range(struct __sk_buff, tc_classid): 6449 case bpf_ctx_range(struct __sk_buff, data): 6450 case bpf_ctx_range(struct __sk_buff, data_meta): 6451 case bpf_ctx_range(struct __sk_buff, data_end): 6452 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 6453 case bpf_ctx_range(struct __sk_buff, tstamp): 6454 case bpf_ctx_range(struct __sk_buff, wire_len): 6455 return false; 6456 } 6457 6458 if (type == BPF_WRITE) { 6459 switch (off) { 6460 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 6461 break; 6462 default: 6463 return false; 6464 } 6465 } 6466 6467 return bpf_skb_is_valid_access(off, size, type, prog, info); 6468 } 6469 6470 static bool cg_skb_is_valid_access(int off, int size, 6471 enum bpf_access_type type, 6472 const struct bpf_prog *prog, 6473 struct bpf_insn_access_aux *info) 6474 { 6475 switch (off) { 6476 case bpf_ctx_range(struct __sk_buff, tc_classid): 6477 case bpf_ctx_range(struct __sk_buff, data_meta): 6478 case bpf_ctx_range(struct __sk_buff, wire_len): 6479 return false; 6480 case bpf_ctx_range(struct __sk_buff, data): 6481 case bpf_ctx_range(struct __sk_buff, data_end): 6482 if (!capable(CAP_SYS_ADMIN)) 6483 return false; 6484 break; 6485 } 6486 6487 if (type == BPF_WRITE) { 6488 switch (off) { 6489 case bpf_ctx_range(struct __sk_buff, mark): 6490 case bpf_ctx_range(struct __sk_buff, priority): 6491 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 6492 break; 6493 case bpf_ctx_range(struct __sk_buff, tstamp): 6494 if (!capable(CAP_SYS_ADMIN)) 6495 return false; 6496 break; 6497 default: 6498 return false; 6499 } 6500 } 6501 6502 switch (off) { 6503 case bpf_ctx_range(struct __sk_buff, data): 6504 info->reg_type = PTR_TO_PACKET; 6505 break; 6506 case bpf_ctx_range(struct __sk_buff, data_end): 6507 info->reg_type = PTR_TO_PACKET_END; 6508 break; 6509 } 6510 6511 return bpf_skb_is_valid_access(off, size, type, prog, info); 6512 } 6513 6514 static bool lwt_is_valid_access(int off, int size, 6515 enum bpf_access_type type, 6516 const struct bpf_prog *prog, 6517 struct bpf_insn_access_aux *info) 6518 { 6519 switch (off) { 6520 case bpf_ctx_range(struct __sk_buff, tc_classid): 6521 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 6522 case bpf_ctx_range(struct __sk_buff, data_meta): 6523 case bpf_ctx_range(struct __sk_buff, tstamp): 6524 case bpf_ctx_range(struct __sk_buff, wire_len): 6525 return false; 6526 } 6527 6528 if (type == BPF_WRITE) { 6529 switch (off) { 6530 case bpf_ctx_range(struct __sk_buff, mark): 6531 case bpf_ctx_range(struct __sk_buff, priority): 6532 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 6533 break; 6534 default: 6535 return false; 6536 } 6537 } 6538 6539 switch (off) { 6540 case bpf_ctx_range(struct __sk_buff, data): 6541 info->reg_type = PTR_TO_PACKET; 6542 break; 6543 case bpf_ctx_range(struct __sk_buff, data_end): 6544 info->reg_type = PTR_TO_PACKET_END; 6545 break; 6546 } 6547 6548 return bpf_skb_is_valid_access(off, size, type, prog, info); 6549 } 6550 6551 /* Attach type specific accesses */ 6552 static bool __sock_filter_check_attach_type(int off, 6553 enum bpf_access_type access_type, 6554 enum bpf_attach_type attach_type) 6555 { 6556 switch (off) { 6557 case offsetof(struct bpf_sock, bound_dev_if): 6558 case offsetof(struct bpf_sock, mark): 6559 case offsetof(struct bpf_sock, priority): 6560 switch (attach_type) { 6561 case BPF_CGROUP_INET_SOCK_CREATE: 6562 goto full_access; 6563 default: 6564 return false; 6565 } 6566 case bpf_ctx_range(struct bpf_sock, src_ip4): 6567 switch (attach_type) { 6568 case BPF_CGROUP_INET4_POST_BIND: 6569 goto read_only; 6570 default: 6571 return false; 6572 } 6573 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 6574 switch (attach_type) { 6575 case BPF_CGROUP_INET6_POST_BIND: 6576 goto read_only; 6577 default: 6578 return false; 6579 } 6580 case bpf_ctx_range(struct bpf_sock, src_port): 6581 switch (attach_type) { 6582 case BPF_CGROUP_INET4_POST_BIND: 6583 case BPF_CGROUP_INET6_POST_BIND: 6584 goto read_only; 6585 default: 6586 return false; 6587 } 6588 } 6589 read_only: 6590 return access_type == BPF_READ; 6591 full_access: 6592 return true; 6593 } 6594 6595 bool bpf_sock_common_is_valid_access(int off, int size, 6596 enum bpf_access_type type, 6597 struct bpf_insn_access_aux *info) 6598 { 6599 switch (off) { 6600 case bpf_ctx_range_till(struct bpf_sock, type, priority): 6601 return false; 6602 default: 6603 return bpf_sock_is_valid_access(off, size, type, info); 6604 } 6605 } 6606 6607 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, 6608 struct bpf_insn_access_aux *info) 6609 { 6610 const int size_default = sizeof(__u32); 6611 6612 if (off < 0 || off >= sizeof(struct bpf_sock)) 6613 return false; 6614 if (off % size != 0) 6615 return false; 6616 6617 switch (off) { 6618 case offsetof(struct bpf_sock, state): 6619 case offsetof(struct bpf_sock, family): 6620 case offsetof(struct bpf_sock, type): 6621 case offsetof(struct bpf_sock, protocol): 6622 case offsetof(struct bpf_sock, dst_port): 6623 case offsetof(struct bpf_sock, src_port): 6624 case bpf_ctx_range(struct bpf_sock, src_ip4): 6625 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 6626 case bpf_ctx_range(struct bpf_sock, dst_ip4): 6627 case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): 6628 bpf_ctx_record_field_size(info, size_default); 6629 return bpf_ctx_narrow_access_ok(off, size, size_default); 6630 } 6631 6632 return size == size_default; 6633 } 6634 6635 static bool sock_filter_is_valid_access(int off, int size, 6636 enum bpf_access_type type, 6637 const struct bpf_prog *prog, 6638 struct bpf_insn_access_aux *info) 6639 { 6640 if (!bpf_sock_is_valid_access(off, size, type, info)) 6641 return false; 6642 return __sock_filter_check_attach_type(off, type, 6643 prog->expected_attach_type); 6644 } 6645 6646 static int bpf_noop_prologue(struct bpf_insn *insn_buf, bool direct_write, 6647 const struct bpf_prog *prog) 6648 { 6649 /* Neither direct read nor direct write requires any preliminary 6650 * action. 6651 */ 6652 return 0; 6653 } 6654 6655 static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write, 6656 const struct bpf_prog *prog, int drop_verdict) 6657 { 6658 struct bpf_insn *insn = insn_buf; 6659 6660 if (!direct_write) 6661 return 0; 6662 6663 /* if (!skb->cloned) 6664 * goto start; 6665 * 6666 * (Fast-path, otherwise approximation that we might be 6667 * a clone, do the rest in helper.) 6668 */ 6669 *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET()); 6670 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK); 6671 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7); 6672 6673 /* ret = bpf_skb_pull_data(skb, 0); */ 6674 *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1); 6675 *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2); 6676 *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, 6677 BPF_FUNC_skb_pull_data); 6678 /* if (!ret) 6679 * goto restore; 6680 * return TC_ACT_SHOT; 6681 */ 6682 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2); 6683 *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict); 6684 *insn++ = BPF_EXIT_INSN(); 6685 6686 /* restore: */ 6687 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6); 6688 /* start: */ 6689 *insn++ = prog->insnsi[0]; 6690 6691 return insn - insn_buf; 6692 } 6693 6694 static int bpf_gen_ld_abs(const struct bpf_insn *orig, 6695 struct bpf_insn *insn_buf) 6696 { 6697 bool indirect = BPF_MODE(orig->code) == BPF_IND; 6698 struct bpf_insn *insn = insn_buf; 6699 6700 /* We're guaranteed here that CTX is in R6. */ 6701 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX); 6702 if (!indirect) { 6703 *insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm); 6704 } else { 6705 *insn++ = BPF_MOV64_REG(BPF_REG_2, orig->src_reg); 6706 if (orig->imm) 6707 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm); 6708 } 6709 6710 switch (BPF_SIZE(orig->code)) { 6711 case BPF_B: 6712 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache); 6713 break; 6714 case BPF_H: 6715 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache); 6716 break; 6717 case BPF_W: 6718 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache); 6719 break; 6720 } 6721 6722 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 2); 6723 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0); 6724 *insn++ = BPF_EXIT_INSN(); 6725 6726 return insn - insn_buf; 6727 } 6728 6729 static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write, 6730 const struct bpf_prog *prog) 6731 { 6732 return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT); 6733 } 6734 6735 static bool tc_cls_act_is_valid_access(int off, int size, 6736 enum bpf_access_type type, 6737 const struct bpf_prog *prog, 6738 struct bpf_insn_access_aux *info) 6739 { 6740 if (type == BPF_WRITE) { 6741 switch (off) { 6742 case bpf_ctx_range(struct __sk_buff, mark): 6743 case bpf_ctx_range(struct __sk_buff, tc_index): 6744 case bpf_ctx_range(struct __sk_buff, priority): 6745 case bpf_ctx_range(struct __sk_buff, tc_classid): 6746 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 6747 case bpf_ctx_range(struct __sk_buff, tstamp): 6748 case bpf_ctx_range(struct __sk_buff, queue_mapping): 6749 break; 6750 default: 6751 return false; 6752 } 6753 } 6754 6755 switch (off) { 6756 case bpf_ctx_range(struct __sk_buff, data): 6757 info->reg_type = PTR_TO_PACKET; 6758 break; 6759 case bpf_ctx_range(struct __sk_buff, data_meta): 6760 info->reg_type = PTR_TO_PACKET_META; 6761 break; 6762 case bpf_ctx_range(struct __sk_buff, data_end): 6763 info->reg_type = PTR_TO_PACKET_END; 6764 break; 6765 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 6766 return false; 6767 } 6768 6769 return bpf_skb_is_valid_access(off, size, type, prog, info); 6770 } 6771 6772 static bool __is_valid_xdp_access(int off, int size) 6773 { 6774 if (off < 0 || off >= sizeof(struct xdp_md)) 6775 return false; 6776 if (off % size != 0) 6777 return false; 6778 if (size != sizeof(__u32)) 6779 return false; 6780 6781 return true; 6782 } 6783 6784 static bool xdp_is_valid_access(int off, int size, 6785 enum bpf_access_type type, 6786 const struct bpf_prog *prog, 6787 struct bpf_insn_access_aux *info) 6788 { 6789 if (type == BPF_WRITE) { 6790 if (bpf_prog_is_dev_bound(prog->aux)) { 6791 switch (off) { 6792 case offsetof(struct xdp_md, rx_queue_index): 6793 return __is_valid_xdp_access(off, size); 6794 } 6795 } 6796 return false; 6797 } 6798 6799 switch (off) { 6800 case offsetof(struct xdp_md, data): 6801 info->reg_type = PTR_TO_PACKET; 6802 break; 6803 case offsetof(struct xdp_md, data_meta): 6804 info->reg_type = PTR_TO_PACKET_META; 6805 break; 6806 case offsetof(struct xdp_md, data_end): 6807 info->reg_type = PTR_TO_PACKET_END; 6808 break; 6809 } 6810 6811 return __is_valid_xdp_access(off, size); 6812 } 6813 6814 void bpf_warn_invalid_xdp_action(u32 act) 6815 { 6816 const u32 act_max = XDP_REDIRECT; 6817 6818 WARN_ONCE(1, "%s XDP return value %u, expect packet loss!\n", 6819 act > act_max ? "Illegal" : "Driver unsupported", 6820 act); 6821 } 6822 EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action); 6823 6824 static bool sock_addr_is_valid_access(int off, int size, 6825 enum bpf_access_type type, 6826 const struct bpf_prog *prog, 6827 struct bpf_insn_access_aux *info) 6828 { 6829 const int size_default = sizeof(__u32); 6830 6831 if (off < 0 || off >= sizeof(struct bpf_sock_addr)) 6832 return false; 6833 if (off % size != 0) 6834 return false; 6835 6836 /* Disallow access to IPv6 fields from IPv4 contex and vise 6837 * versa. 6838 */ 6839 switch (off) { 6840 case bpf_ctx_range(struct bpf_sock_addr, user_ip4): 6841 switch (prog->expected_attach_type) { 6842 case BPF_CGROUP_INET4_BIND: 6843 case BPF_CGROUP_INET4_CONNECT: 6844 case BPF_CGROUP_UDP4_SENDMSG: 6845 case BPF_CGROUP_UDP4_RECVMSG: 6846 break; 6847 default: 6848 return false; 6849 } 6850 break; 6851 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 6852 switch (prog->expected_attach_type) { 6853 case BPF_CGROUP_INET6_BIND: 6854 case BPF_CGROUP_INET6_CONNECT: 6855 case BPF_CGROUP_UDP6_SENDMSG: 6856 case BPF_CGROUP_UDP6_RECVMSG: 6857 break; 6858 default: 6859 return false; 6860 } 6861 break; 6862 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): 6863 switch (prog->expected_attach_type) { 6864 case BPF_CGROUP_UDP4_SENDMSG: 6865 break; 6866 default: 6867 return false; 6868 } 6869 break; 6870 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 6871 msg_src_ip6[3]): 6872 switch (prog->expected_attach_type) { 6873 case BPF_CGROUP_UDP6_SENDMSG: 6874 break; 6875 default: 6876 return false; 6877 } 6878 break; 6879 } 6880 6881 switch (off) { 6882 case bpf_ctx_range(struct bpf_sock_addr, user_ip4): 6883 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 6884 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): 6885 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 6886 msg_src_ip6[3]): 6887 /* Only narrow read access allowed for now. */ 6888 if (type == BPF_READ) { 6889 bpf_ctx_record_field_size(info, size_default); 6890 if (!bpf_ctx_narrow_access_ok(off, size, size_default)) 6891 return false; 6892 } else { 6893 if (bpf_ctx_wide_store_ok(off, size, 6894 struct bpf_sock_addr, 6895 user_ip6)) 6896 return true; 6897 6898 if (bpf_ctx_wide_store_ok(off, size, 6899 struct bpf_sock_addr, 6900 msg_src_ip6)) 6901 return true; 6902 6903 if (size != size_default) 6904 return false; 6905 } 6906 break; 6907 case bpf_ctx_range(struct bpf_sock_addr, user_port): 6908 if (size != size_default) 6909 return false; 6910 break; 6911 case offsetof(struct bpf_sock_addr, sk): 6912 if (type != BPF_READ) 6913 return false; 6914 if (size != sizeof(__u64)) 6915 return false; 6916 info->reg_type = PTR_TO_SOCKET; 6917 break; 6918 default: 6919 if (type == BPF_READ) { 6920 if (size != size_default) 6921 return false; 6922 } else { 6923 return false; 6924 } 6925 } 6926 6927 return true; 6928 } 6929 6930 static bool sock_ops_is_valid_access(int off, int size, 6931 enum bpf_access_type type, 6932 const struct bpf_prog *prog, 6933 struct bpf_insn_access_aux *info) 6934 { 6935 const int size_default = sizeof(__u32); 6936 6937 if (off < 0 || off >= sizeof(struct bpf_sock_ops)) 6938 return false; 6939 6940 /* The verifier guarantees that size > 0. */ 6941 if (off % size != 0) 6942 return false; 6943 6944 if (type == BPF_WRITE) { 6945 switch (off) { 6946 case offsetof(struct bpf_sock_ops, reply): 6947 case offsetof(struct bpf_sock_ops, sk_txhash): 6948 if (size != size_default) 6949 return false; 6950 break; 6951 default: 6952 return false; 6953 } 6954 } else { 6955 switch (off) { 6956 case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received, 6957 bytes_acked): 6958 if (size != sizeof(__u64)) 6959 return false; 6960 break; 6961 case offsetof(struct bpf_sock_ops, sk): 6962 if (size != sizeof(__u64)) 6963 return false; 6964 info->reg_type = PTR_TO_SOCKET_OR_NULL; 6965 break; 6966 default: 6967 if (size != size_default) 6968 return false; 6969 break; 6970 } 6971 } 6972 6973 return true; 6974 } 6975 6976 static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write, 6977 const struct bpf_prog *prog) 6978 { 6979 return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP); 6980 } 6981 6982 static bool sk_skb_is_valid_access(int off, int size, 6983 enum bpf_access_type type, 6984 const struct bpf_prog *prog, 6985 struct bpf_insn_access_aux *info) 6986 { 6987 switch (off) { 6988 case bpf_ctx_range(struct __sk_buff, tc_classid): 6989 case bpf_ctx_range(struct __sk_buff, data_meta): 6990 case bpf_ctx_range(struct __sk_buff, tstamp): 6991 case bpf_ctx_range(struct __sk_buff, wire_len): 6992 return false; 6993 } 6994 6995 if (type == BPF_WRITE) { 6996 switch (off) { 6997 case bpf_ctx_range(struct __sk_buff, tc_index): 6998 case bpf_ctx_range(struct __sk_buff, priority): 6999 break; 7000 default: 7001 return false; 7002 } 7003 } 7004 7005 switch (off) { 7006 case bpf_ctx_range(struct __sk_buff, mark): 7007 return false; 7008 case bpf_ctx_range(struct __sk_buff, data): 7009 info->reg_type = PTR_TO_PACKET; 7010 break; 7011 case bpf_ctx_range(struct __sk_buff, data_end): 7012 info->reg_type = PTR_TO_PACKET_END; 7013 break; 7014 } 7015 7016 return bpf_skb_is_valid_access(off, size, type, prog, info); 7017 } 7018 7019 static bool sk_msg_is_valid_access(int off, int size, 7020 enum bpf_access_type type, 7021 const struct bpf_prog *prog, 7022 struct bpf_insn_access_aux *info) 7023 { 7024 if (type == BPF_WRITE) 7025 return false; 7026 7027 if (off % size != 0) 7028 return false; 7029 7030 switch (off) { 7031 case offsetof(struct sk_msg_md, data): 7032 info->reg_type = PTR_TO_PACKET; 7033 if (size != sizeof(__u64)) 7034 return false; 7035 break; 7036 case offsetof(struct sk_msg_md, data_end): 7037 info->reg_type = PTR_TO_PACKET_END; 7038 if (size != sizeof(__u64)) 7039 return false; 7040 break; 7041 case bpf_ctx_range(struct sk_msg_md, family): 7042 case bpf_ctx_range(struct sk_msg_md, remote_ip4): 7043 case bpf_ctx_range(struct sk_msg_md, local_ip4): 7044 case bpf_ctx_range_till(struct sk_msg_md, remote_ip6[0], remote_ip6[3]): 7045 case bpf_ctx_range_till(struct sk_msg_md, local_ip6[0], local_ip6[3]): 7046 case bpf_ctx_range(struct sk_msg_md, remote_port): 7047 case bpf_ctx_range(struct sk_msg_md, local_port): 7048 case bpf_ctx_range(struct sk_msg_md, size): 7049 if (size != sizeof(__u32)) 7050 return false; 7051 break; 7052 default: 7053 return false; 7054 } 7055 return true; 7056 } 7057 7058 static bool flow_dissector_is_valid_access(int off, int size, 7059 enum bpf_access_type type, 7060 const struct bpf_prog *prog, 7061 struct bpf_insn_access_aux *info) 7062 { 7063 const int size_default = sizeof(__u32); 7064 7065 if (off < 0 || off >= sizeof(struct __sk_buff)) 7066 return false; 7067 7068 if (type == BPF_WRITE) 7069 return false; 7070 7071 switch (off) { 7072 case bpf_ctx_range(struct __sk_buff, data): 7073 if (size != size_default) 7074 return false; 7075 info->reg_type = PTR_TO_PACKET; 7076 return true; 7077 case bpf_ctx_range(struct __sk_buff, data_end): 7078 if (size != size_default) 7079 return false; 7080 info->reg_type = PTR_TO_PACKET_END; 7081 return true; 7082 case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): 7083 if (size != sizeof(__u64)) 7084 return false; 7085 info->reg_type = PTR_TO_FLOW_KEYS; 7086 return true; 7087 default: 7088 return false; 7089 } 7090 } 7091 7092 static u32 flow_dissector_convert_ctx_access(enum bpf_access_type type, 7093 const struct bpf_insn *si, 7094 struct bpf_insn *insn_buf, 7095 struct bpf_prog *prog, 7096 u32 *target_size) 7097 7098 { 7099 struct bpf_insn *insn = insn_buf; 7100 7101 switch (si->off) { 7102 case offsetof(struct __sk_buff, data): 7103 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data), 7104 si->dst_reg, si->src_reg, 7105 offsetof(struct bpf_flow_dissector, data)); 7106 break; 7107 7108 case offsetof(struct __sk_buff, data_end): 7109 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data_end), 7110 si->dst_reg, si->src_reg, 7111 offsetof(struct bpf_flow_dissector, data_end)); 7112 break; 7113 7114 case offsetof(struct __sk_buff, flow_keys): 7115 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, flow_keys), 7116 si->dst_reg, si->src_reg, 7117 offsetof(struct bpf_flow_dissector, flow_keys)); 7118 break; 7119 } 7120 7121 return insn - insn_buf; 7122 } 7123 7124 static u32 bpf_convert_ctx_access(enum bpf_access_type type, 7125 const struct bpf_insn *si, 7126 struct bpf_insn *insn_buf, 7127 struct bpf_prog *prog, u32 *target_size) 7128 { 7129 struct bpf_insn *insn = insn_buf; 7130 int off; 7131 7132 switch (si->off) { 7133 case offsetof(struct __sk_buff, len): 7134 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7135 bpf_target_off(struct sk_buff, len, 4, 7136 target_size)); 7137 break; 7138 7139 case offsetof(struct __sk_buff, protocol): 7140 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 7141 bpf_target_off(struct sk_buff, protocol, 2, 7142 target_size)); 7143 break; 7144 7145 case offsetof(struct __sk_buff, vlan_proto): 7146 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 7147 bpf_target_off(struct sk_buff, vlan_proto, 2, 7148 target_size)); 7149 break; 7150 7151 case offsetof(struct __sk_buff, priority): 7152 if (type == BPF_WRITE) 7153 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 7154 bpf_target_off(struct sk_buff, priority, 4, 7155 target_size)); 7156 else 7157 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7158 bpf_target_off(struct sk_buff, priority, 4, 7159 target_size)); 7160 break; 7161 7162 case offsetof(struct __sk_buff, ingress_ifindex): 7163 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7164 bpf_target_off(struct sk_buff, skb_iif, 4, 7165 target_size)); 7166 break; 7167 7168 case offsetof(struct __sk_buff, ifindex): 7169 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 7170 si->dst_reg, si->src_reg, 7171 offsetof(struct sk_buff, dev)); 7172 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 7173 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7174 bpf_target_off(struct net_device, ifindex, 4, 7175 target_size)); 7176 break; 7177 7178 case offsetof(struct __sk_buff, hash): 7179 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7180 bpf_target_off(struct sk_buff, hash, 4, 7181 target_size)); 7182 break; 7183 7184 case offsetof(struct __sk_buff, mark): 7185 if (type == BPF_WRITE) 7186 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 7187 bpf_target_off(struct sk_buff, mark, 4, 7188 target_size)); 7189 else 7190 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7191 bpf_target_off(struct sk_buff, mark, 4, 7192 target_size)); 7193 break; 7194 7195 case offsetof(struct __sk_buff, pkt_type): 7196 *target_size = 1; 7197 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, 7198 PKT_TYPE_OFFSET()); 7199 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX); 7200 #ifdef __BIG_ENDIAN_BITFIELD 7201 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5); 7202 #endif 7203 break; 7204 7205 case offsetof(struct __sk_buff, queue_mapping): 7206 if (type == BPF_WRITE) { 7207 *insn++ = BPF_JMP_IMM(BPF_JGE, si->src_reg, NO_QUEUE_MAPPING, 1); 7208 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg, 7209 bpf_target_off(struct sk_buff, 7210 queue_mapping, 7211 2, target_size)); 7212 } else { 7213 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 7214 bpf_target_off(struct sk_buff, 7215 queue_mapping, 7216 2, target_size)); 7217 } 7218 break; 7219 7220 case offsetof(struct __sk_buff, vlan_present): 7221 *target_size = 1; 7222 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, 7223 PKT_VLAN_PRESENT_OFFSET()); 7224 if (PKT_VLAN_PRESENT_BIT) 7225 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, PKT_VLAN_PRESENT_BIT); 7226 if (PKT_VLAN_PRESENT_BIT < 7) 7227 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1); 7228 break; 7229 7230 case offsetof(struct __sk_buff, vlan_tci): 7231 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 7232 bpf_target_off(struct sk_buff, vlan_tci, 2, 7233 target_size)); 7234 break; 7235 7236 case offsetof(struct __sk_buff, cb[0]) ... 7237 offsetofend(struct __sk_buff, cb[4]) - 1: 7238 BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, data) < 20); 7239 BUILD_BUG_ON((offsetof(struct sk_buff, cb) + 7240 offsetof(struct qdisc_skb_cb, data)) % 7241 sizeof(__u64)); 7242 7243 prog->cb_access = 1; 7244 off = si->off; 7245 off -= offsetof(struct __sk_buff, cb[0]); 7246 off += offsetof(struct sk_buff, cb); 7247 off += offsetof(struct qdisc_skb_cb, data); 7248 if (type == BPF_WRITE) 7249 *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg, 7250 si->src_reg, off); 7251 else 7252 *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg, 7253 si->src_reg, off); 7254 break; 7255 7256 case offsetof(struct __sk_buff, tc_classid): 7257 BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, tc_classid) != 2); 7258 7259 off = si->off; 7260 off -= offsetof(struct __sk_buff, tc_classid); 7261 off += offsetof(struct sk_buff, cb); 7262 off += offsetof(struct qdisc_skb_cb, tc_classid); 7263 *target_size = 2; 7264 if (type == BPF_WRITE) 7265 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, 7266 si->src_reg, off); 7267 else 7268 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, 7269 si->src_reg, off); 7270 break; 7271 7272 case offsetof(struct __sk_buff, data): 7273 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 7274 si->dst_reg, si->src_reg, 7275 offsetof(struct sk_buff, data)); 7276 break; 7277 7278 case offsetof(struct __sk_buff, data_meta): 7279 off = si->off; 7280 off -= offsetof(struct __sk_buff, data_meta); 7281 off += offsetof(struct sk_buff, cb); 7282 off += offsetof(struct bpf_skb_data_end, data_meta); 7283 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, 7284 si->src_reg, off); 7285 break; 7286 7287 case offsetof(struct __sk_buff, data_end): 7288 off = si->off; 7289 off -= offsetof(struct __sk_buff, data_end); 7290 off += offsetof(struct sk_buff, cb); 7291 off += offsetof(struct bpf_skb_data_end, data_end); 7292 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, 7293 si->src_reg, off); 7294 break; 7295 7296 case offsetof(struct __sk_buff, tc_index): 7297 #ifdef CONFIG_NET_SCHED 7298 if (type == BPF_WRITE) 7299 *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg, 7300 bpf_target_off(struct sk_buff, tc_index, 2, 7301 target_size)); 7302 else 7303 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 7304 bpf_target_off(struct sk_buff, tc_index, 2, 7305 target_size)); 7306 #else 7307 *target_size = 2; 7308 if (type == BPF_WRITE) 7309 *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg); 7310 else 7311 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 7312 #endif 7313 break; 7314 7315 case offsetof(struct __sk_buff, napi_id): 7316 #if defined(CONFIG_NET_RX_BUSY_POLL) 7317 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7318 bpf_target_off(struct sk_buff, napi_id, 4, 7319 target_size)); 7320 *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1); 7321 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 7322 #else 7323 *target_size = 4; 7324 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 7325 #endif 7326 break; 7327 case offsetof(struct __sk_buff, family): 7328 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2); 7329 7330 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7331 si->dst_reg, si->src_reg, 7332 offsetof(struct sk_buff, sk)); 7333 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 7334 bpf_target_off(struct sock_common, 7335 skc_family, 7336 2, target_size)); 7337 break; 7338 case offsetof(struct __sk_buff, remote_ip4): 7339 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4); 7340 7341 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7342 si->dst_reg, si->src_reg, 7343 offsetof(struct sk_buff, sk)); 7344 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7345 bpf_target_off(struct sock_common, 7346 skc_daddr, 7347 4, target_size)); 7348 break; 7349 case offsetof(struct __sk_buff, local_ip4): 7350 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, 7351 skc_rcv_saddr) != 4); 7352 7353 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7354 si->dst_reg, si->src_reg, 7355 offsetof(struct sk_buff, sk)); 7356 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7357 bpf_target_off(struct sock_common, 7358 skc_rcv_saddr, 7359 4, target_size)); 7360 break; 7361 case offsetof(struct __sk_buff, remote_ip6[0]) ... 7362 offsetof(struct __sk_buff, remote_ip6[3]): 7363 #if IS_ENABLED(CONFIG_IPV6) 7364 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, 7365 skc_v6_daddr.s6_addr32[0]) != 4); 7366 7367 off = si->off; 7368 off -= offsetof(struct __sk_buff, remote_ip6[0]); 7369 7370 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7371 si->dst_reg, si->src_reg, 7372 offsetof(struct sk_buff, sk)); 7373 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7374 offsetof(struct sock_common, 7375 skc_v6_daddr.s6_addr32[0]) + 7376 off); 7377 #else 7378 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 7379 #endif 7380 break; 7381 case offsetof(struct __sk_buff, local_ip6[0]) ... 7382 offsetof(struct __sk_buff, local_ip6[3]): 7383 #if IS_ENABLED(CONFIG_IPV6) 7384 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, 7385 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 7386 7387 off = si->off; 7388 off -= offsetof(struct __sk_buff, local_ip6[0]); 7389 7390 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7391 si->dst_reg, si->src_reg, 7392 offsetof(struct sk_buff, sk)); 7393 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7394 offsetof(struct sock_common, 7395 skc_v6_rcv_saddr.s6_addr32[0]) + 7396 off); 7397 #else 7398 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 7399 #endif 7400 break; 7401 7402 case offsetof(struct __sk_buff, remote_port): 7403 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2); 7404 7405 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7406 si->dst_reg, si->src_reg, 7407 offsetof(struct sk_buff, sk)); 7408 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 7409 bpf_target_off(struct sock_common, 7410 skc_dport, 7411 2, target_size)); 7412 #ifndef __BIG_ENDIAN_BITFIELD 7413 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 7414 #endif 7415 break; 7416 7417 case offsetof(struct __sk_buff, local_port): 7418 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2); 7419 7420 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7421 si->dst_reg, si->src_reg, 7422 offsetof(struct sk_buff, sk)); 7423 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 7424 bpf_target_off(struct sock_common, 7425 skc_num, 2, target_size)); 7426 break; 7427 7428 case offsetof(struct __sk_buff, tstamp): 7429 BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, tstamp) != 8); 7430 7431 if (type == BPF_WRITE) 7432 *insn++ = BPF_STX_MEM(BPF_DW, 7433 si->dst_reg, si->src_reg, 7434 bpf_target_off(struct sk_buff, 7435 tstamp, 8, 7436 target_size)); 7437 else 7438 *insn++ = BPF_LDX_MEM(BPF_DW, 7439 si->dst_reg, si->src_reg, 7440 bpf_target_off(struct sk_buff, 7441 tstamp, 8, 7442 target_size)); 7443 break; 7444 7445 case offsetof(struct __sk_buff, gso_segs): 7446 /* si->dst_reg = skb_shinfo(SKB); */ 7447 #ifdef NET_SKBUFF_DATA_USES_OFFSET 7448 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, head), 7449 si->dst_reg, si->src_reg, 7450 offsetof(struct sk_buff, head)); 7451 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), 7452 BPF_REG_AX, si->src_reg, 7453 offsetof(struct sk_buff, end)); 7454 *insn++ = BPF_ALU64_REG(BPF_ADD, si->dst_reg, BPF_REG_AX); 7455 #else 7456 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), 7457 si->dst_reg, si->src_reg, 7458 offsetof(struct sk_buff, end)); 7459 #endif 7460 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_segs), 7461 si->dst_reg, si->dst_reg, 7462 bpf_target_off(struct skb_shared_info, 7463 gso_segs, 2, 7464 target_size)); 7465 break; 7466 case offsetof(struct __sk_buff, wire_len): 7467 BUILD_BUG_ON(FIELD_SIZEOF(struct qdisc_skb_cb, pkt_len) != 4); 7468 7469 off = si->off; 7470 off -= offsetof(struct __sk_buff, wire_len); 7471 off += offsetof(struct sk_buff, cb); 7472 off += offsetof(struct qdisc_skb_cb, pkt_len); 7473 *target_size = 4; 7474 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, off); 7475 break; 7476 7477 case offsetof(struct __sk_buff, sk): 7478 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 7479 si->dst_reg, si->src_reg, 7480 offsetof(struct sk_buff, sk)); 7481 break; 7482 } 7483 7484 return insn - insn_buf; 7485 } 7486 7487 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 7488 const struct bpf_insn *si, 7489 struct bpf_insn *insn_buf, 7490 struct bpf_prog *prog, u32 *target_size) 7491 { 7492 struct bpf_insn *insn = insn_buf; 7493 int off; 7494 7495 switch (si->off) { 7496 case offsetof(struct bpf_sock, bound_dev_if): 7497 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_bound_dev_if) != 4); 7498 7499 if (type == BPF_WRITE) 7500 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 7501 offsetof(struct sock, sk_bound_dev_if)); 7502 else 7503 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7504 offsetof(struct sock, sk_bound_dev_if)); 7505 break; 7506 7507 case offsetof(struct bpf_sock, mark): 7508 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_mark) != 4); 7509 7510 if (type == BPF_WRITE) 7511 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 7512 offsetof(struct sock, sk_mark)); 7513 else 7514 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7515 offsetof(struct sock, sk_mark)); 7516 break; 7517 7518 case offsetof(struct bpf_sock, priority): 7519 BUILD_BUG_ON(FIELD_SIZEOF(struct sock, sk_priority) != 4); 7520 7521 if (type == BPF_WRITE) 7522 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 7523 offsetof(struct sock, sk_priority)); 7524 else 7525 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7526 offsetof(struct sock, sk_priority)); 7527 break; 7528 7529 case offsetof(struct bpf_sock, family): 7530 *insn++ = BPF_LDX_MEM( 7531 BPF_FIELD_SIZEOF(struct sock_common, skc_family), 7532 si->dst_reg, si->src_reg, 7533 bpf_target_off(struct sock_common, 7534 skc_family, 7535 FIELD_SIZEOF(struct sock_common, 7536 skc_family), 7537 target_size)); 7538 break; 7539 7540 case offsetof(struct bpf_sock, type): 7541 BUILD_BUG_ON(HWEIGHT32(SK_FL_TYPE_MASK) != BITS_PER_BYTE * 2); 7542 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7543 offsetof(struct sock, __sk_flags_offset)); 7544 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_TYPE_MASK); 7545 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_TYPE_SHIFT); 7546 *target_size = 2; 7547 break; 7548 7549 case offsetof(struct bpf_sock, protocol): 7550 BUILD_BUG_ON(HWEIGHT32(SK_FL_PROTO_MASK) != BITS_PER_BYTE); 7551 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7552 offsetof(struct sock, __sk_flags_offset)); 7553 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK); 7554 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_PROTO_SHIFT); 7555 *target_size = 1; 7556 break; 7557 7558 case offsetof(struct bpf_sock, src_ip4): 7559 *insn++ = BPF_LDX_MEM( 7560 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 7561 bpf_target_off(struct sock_common, skc_rcv_saddr, 7562 FIELD_SIZEOF(struct sock_common, 7563 skc_rcv_saddr), 7564 target_size)); 7565 break; 7566 7567 case offsetof(struct bpf_sock, dst_ip4): 7568 *insn++ = BPF_LDX_MEM( 7569 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 7570 bpf_target_off(struct sock_common, skc_daddr, 7571 FIELD_SIZEOF(struct sock_common, 7572 skc_daddr), 7573 target_size)); 7574 break; 7575 7576 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 7577 #if IS_ENABLED(CONFIG_IPV6) 7578 off = si->off; 7579 off -= offsetof(struct bpf_sock, src_ip6[0]); 7580 *insn++ = BPF_LDX_MEM( 7581 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 7582 bpf_target_off( 7583 struct sock_common, 7584 skc_v6_rcv_saddr.s6_addr32[0], 7585 FIELD_SIZEOF(struct sock_common, 7586 skc_v6_rcv_saddr.s6_addr32[0]), 7587 target_size) + off); 7588 #else 7589 (void)off; 7590 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 7591 #endif 7592 break; 7593 7594 case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): 7595 #if IS_ENABLED(CONFIG_IPV6) 7596 off = si->off; 7597 off -= offsetof(struct bpf_sock, dst_ip6[0]); 7598 *insn++ = BPF_LDX_MEM( 7599 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 7600 bpf_target_off(struct sock_common, 7601 skc_v6_daddr.s6_addr32[0], 7602 FIELD_SIZEOF(struct sock_common, 7603 skc_v6_daddr.s6_addr32[0]), 7604 target_size) + off); 7605 #else 7606 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 7607 *target_size = 4; 7608 #endif 7609 break; 7610 7611 case offsetof(struct bpf_sock, src_port): 7612 *insn++ = BPF_LDX_MEM( 7613 BPF_FIELD_SIZEOF(struct sock_common, skc_num), 7614 si->dst_reg, si->src_reg, 7615 bpf_target_off(struct sock_common, skc_num, 7616 FIELD_SIZEOF(struct sock_common, 7617 skc_num), 7618 target_size)); 7619 break; 7620 7621 case offsetof(struct bpf_sock, dst_port): 7622 *insn++ = BPF_LDX_MEM( 7623 BPF_FIELD_SIZEOF(struct sock_common, skc_dport), 7624 si->dst_reg, si->src_reg, 7625 bpf_target_off(struct sock_common, skc_dport, 7626 FIELD_SIZEOF(struct sock_common, 7627 skc_dport), 7628 target_size)); 7629 break; 7630 7631 case offsetof(struct bpf_sock, state): 7632 *insn++ = BPF_LDX_MEM( 7633 BPF_FIELD_SIZEOF(struct sock_common, skc_state), 7634 si->dst_reg, si->src_reg, 7635 bpf_target_off(struct sock_common, skc_state, 7636 FIELD_SIZEOF(struct sock_common, 7637 skc_state), 7638 target_size)); 7639 break; 7640 } 7641 7642 return insn - insn_buf; 7643 } 7644 7645 static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type, 7646 const struct bpf_insn *si, 7647 struct bpf_insn *insn_buf, 7648 struct bpf_prog *prog, u32 *target_size) 7649 { 7650 struct bpf_insn *insn = insn_buf; 7651 7652 switch (si->off) { 7653 case offsetof(struct __sk_buff, ifindex): 7654 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 7655 si->dst_reg, si->src_reg, 7656 offsetof(struct sk_buff, dev)); 7657 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7658 bpf_target_off(struct net_device, ifindex, 4, 7659 target_size)); 7660 break; 7661 default: 7662 return bpf_convert_ctx_access(type, si, insn_buf, prog, 7663 target_size); 7664 } 7665 7666 return insn - insn_buf; 7667 } 7668 7669 static u32 xdp_convert_ctx_access(enum bpf_access_type type, 7670 const struct bpf_insn *si, 7671 struct bpf_insn *insn_buf, 7672 struct bpf_prog *prog, u32 *target_size) 7673 { 7674 struct bpf_insn *insn = insn_buf; 7675 7676 switch (si->off) { 7677 case offsetof(struct xdp_md, data): 7678 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data), 7679 si->dst_reg, si->src_reg, 7680 offsetof(struct xdp_buff, data)); 7681 break; 7682 case offsetof(struct xdp_md, data_meta): 7683 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta), 7684 si->dst_reg, si->src_reg, 7685 offsetof(struct xdp_buff, data_meta)); 7686 break; 7687 case offsetof(struct xdp_md, data_end): 7688 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end), 7689 si->dst_reg, si->src_reg, 7690 offsetof(struct xdp_buff, data_end)); 7691 break; 7692 case offsetof(struct xdp_md, ingress_ifindex): 7693 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), 7694 si->dst_reg, si->src_reg, 7695 offsetof(struct xdp_buff, rxq)); 7696 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev), 7697 si->dst_reg, si->dst_reg, 7698 offsetof(struct xdp_rxq_info, dev)); 7699 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7700 offsetof(struct net_device, ifindex)); 7701 break; 7702 case offsetof(struct xdp_md, rx_queue_index): 7703 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), 7704 si->dst_reg, si->src_reg, 7705 offsetof(struct xdp_buff, rxq)); 7706 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 7707 offsetof(struct xdp_rxq_info, 7708 queue_index)); 7709 break; 7710 } 7711 7712 return insn - insn_buf; 7713 } 7714 7715 /* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of 7716 * context Structure, F is Field in context structure that contains a pointer 7717 * to Nested Structure of type NS that has the field NF. 7718 * 7719 * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make 7720 * sure that SIZE is not greater than actual size of S.F.NF. 7721 * 7722 * If offset OFF is provided, the load happens from that offset relative to 7723 * offset of NF. 7724 */ 7725 #define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF) \ 7726 do { \ 7727 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg, \ 7728 si->src_reg, offsetof(S, F)); \ 7729 *insn++ = BPF_LDX_MEM( \ 7730 SIZE, si->dst_reg, si->dst_reg, \ 7731 bpf_target_off(NS, NF, FIELD_SIZEOF(NS, NF), \ 7732 target_size) \ 7733 + OFF); \ 7734 } while (0) 7735 7736 #define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF) \ 7737 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, \ 7738 BPF_FIELD_SIZEOF(NS, NF), 0) 7739 7740 /* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to 7741 * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation. 7742 * 7743 * In addition it uses Temporary Field TF (member of struct S) as the 3rd 7744 * "register" since two registers available in convert_ctx_access are not 7745 * enough: we can't override neither SRC, since it contains value to store, nor 7746 * DST since it contains pointer to context that may be used by later 7747 * instructions. But we need a temporary place to save pointer to nested 7748 * structure whose field we want to store to. 7749 */ 7750 #define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, OFF, TF) \ 7751 do { \ 7752 int tmp_reg = BPF_REG_9; \ 7753 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ 7754 --tmp_reg; \ 7755 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ 7756 --tmp_reg; \ 7757 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg, \ 7758 offsetof(S, TF)); \ 7759 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg, \ 7760 si->dst_reg, offsetof(S, F)); \ 7761 *insn++ = BPF_STX_MEM(SIZE, tmp_reg, si->src_reg, \ 7762 bpf_target_off(NS, NF, FIELD_SIZEOF(NS, NF), \ 7763 target_size) \ 7764 + OFF); \ 7765 *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg, \ 7766 offsetof(S, TF)); \ 7767 } while (0) 7768 7769 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \ 7770 TF) \ 7771 do { \ 7772 if (type == BPF_WRITE) { \ 7773 SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, \ 7774 OFF, TF); \ 7775 } else { \ 7776 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( \ 7777 S, NS, F, NF, SIZE, OFF); \ 7778 } \ 7779 } while (0) 7780 7781 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF) \ 7782 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( \ 7783 S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF) 7784 7785 static u32 sock_addr_convert_ctx_access(enum bpf_access_type type, 7786 const struct bpf_insn *si, 7787 struct bpf_insn *insn_buf, 7788 struct bpf_prog *prog, u32 *target_size) 7789 { 7790 struct bpf_insn *insn = insn_buf; 7791 int off; 7792 7793 switch (si->off) { 7794 case offsetof(struct bpf_sock_addr, user_family): 7795 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 7796 struct sockaddr, uaddr, sa_family); 7797 break; 7798 7799 case offsetof(struct bpf_sock_addr, user_ip4): 7800 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 7801 struct bpf_sock_addr_kern, struct sockaddr_in, uaddr, 7802 sin_addr, BPF_SIZE(si->code), 0, tmp_reg); 7803 break; 7804 7805 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 7806 off = si->off; 7807 off -= offsetof(struct bpf_sock_addr, user_ip6[0]); 7808 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 7809 struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr, 7810 sin6_addr.s6_addr32[0], BPF_SIZE(si->code), off, 7811 tmp_reg); 7812 break; 7813 7814 case offsetof(struct bpf_sock_addr, user_port): 7815 /* To get port we need to know sa_family first and then treat 7816 * sockaddr as either sockaddr_in or sockaddr_in6. 7817 * Though we can simplify since port field has same offset and 7818 * size in both structures. 7819 * Here we check this invariant and use just one of the 7820 * structures if it's true. 7821 */ 7822 BUILD_BUG_ON(offsetof(struct sockaddr_in, sin_port) != 7823 offsetof(struct sockaddr_in6, sin6_port)); 7824 BUILD_BUG_ON(FIELD_SIZEOF(struct sockaddr_in, sin_port) != 7825 FIELD_SIZEOF(struct sockaddr_in6, sin6_port)); 7826 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(struct bpf_sock_addr_kern, 7827 struct sockaddr_in6, uaddr, 7828 sin6_port, tmp_reg); 7829 break; 7830 7831 case offsetof(struct bpf_sock_addr, family): 7832 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 7833 struct sock, sk, sk_family); 7834 break; 7835 7836 case offsetof(struct bpf_sock_addr, type): 7837 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( 7838 struct bpf_sock_addr_kern, struct sock, sk, 7839 __sk_flags_offset, BPF_W, 0); 7840 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_TYPE_MASK); 7841 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, SK_FL_TYPE_SHIFT); 7842 break; 7843 7844 case offsetof(struct bpf_sock_addr, protocol): 7845 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( 7846 struct bpf_sock_addr_kern, struct sock, sk, 7847 __sk_flags_offset, BPF_W, 0); 7848 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK); 7849 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 7850 SK_FL_PROTO_SHIFT); 7851 break; 7852 7853 case offsetof(struct bpf_sock_addr, msg_src_ip4): 7854 /* Treat t_ctx as struct in_addr for msg_src_ip4. */ 7855 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 7856 struct bpf_sock_addr_kern, struct in_addr, t_ctx, 7857 s_addr, BPF_SIZE(si->code), 0, tmp_reg); 7858 break; 7859 7860 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 7861 msg_src_ip6[3]): 7862 off = si->off; 7863 off -= offsetof(struct bpf_sock_addr, msg_src_ip6[0]); 7864 /* Treat t_ctx as struct in6_addr for msg_src_ip6. */ 7865 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 7866 struct bpf_sock_addr_kern, struct in6_addr, t_ctx, 7867 s6_addr32[0], BPF_SIZE(si->code), off, tmp_reg); 7868 break; 7869 case offsetof(struct bpf_sock_addr, sk): 7870 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_addr_kern, sk), 7871 si->dst_reg, si->src_reg, 7872 offsetof(struct bpf_sock_addr_kern, sk)); 7873 break; 7874 } 7875 7876 return insn - insn_buf; 7877 } 7878 7879 static u32 sock_ops_convert_ctx_access(enum bpf_access_type type, 7880 const struct bpf_insn *si, 7881 struct bpf_insn *insn_buf, 7882 struct bpf_prog *prog, 7883 u32 *target_size) 7884 { 7885 struct bpf_insn *insn = insn_buf; 7886 int off; 7887 7888 /* Helper macro for adding read access to tcp_sock or sock fields. */ 7889 #define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ 7890 do { \ 7891 BUILD_BUG_ON(FIELD_SIZEOF(OBJ, OBJ_FIELD) > \ 7892 FIELD_SIZEOF(struct bpf_sock_ops, BPF_FIELD)); \ 7893 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 7894 struct bpf_sock_ops_kern, \ 7895 is_fullsock), \ 7896 si->dst_reg, si->src_reg, \ 7897 offsetof(struct bpf_sock_ops_kern, \ 7898 is_fullsock)); \ 7899 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 2); \ 7900 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 7901 struct bpf_sock_ops_kern, sk),\ 7902 si->dst_reg, si->src_reg, \ 7903 offsetof(struct bpf_sock_ops_kern, sk));\ 7904 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ, \ 7905 OBJ_FIELD), \ 7906 si->dst_reg, si->dst_reg, \ 7907 offsetof(OBJ, OBJ_FIELD)); \ 7908 } while (0) 7909 7910 #define SOCK_OPS_GET_TCP_SOCK_FIELD(FIELD) \ 7911 SOCK_OPS_GET_FIELD(FIELD, FIELD, struct tcp_sock) 7912 7913 /* Helper macro for adding write access to tcp_sock or sock fields. 7914 * The macro is called with two registers, dst_reg which contains a pointer 7915 * to ctx (context) and src_reg which contains the value that should be 7916 * stored. However, we need an additional register since we cannot overwrite 7917 * dst_reg because it may be used later in the program. 7918 * Instead we "borrow" one of the other register. We first save its value 7919 * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore 7920 * it at the end of the macro. 7921 */ 7922 #define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ 7923 do { \ 7924 int reg = BPF_REG_9; \ 7925 BUILD_BUG_ON(FIELD_SIZEOF(OBJ, OBJ_FIELD) > \ 7926 FIELD_SIZEOF(struct bpf_sock_ops, BPF_FIELD)); \ 7927 if (si->dst_reg == reg || si->src_reg == reg) \ 7928 reg--; \ 7929 if (si->dst_reg == reg || si->src_reg == reg) \ 7930 reg--; \ 7931 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg, \ 7932 offsetof(struct bpf_sock_ops_kern, \ 7933 temp)); \ 7934 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 7935 struct bpf_sock_ops_kern, \ 7936 is_fullsock), \ 7937 reg, si->dst_reg, \ 7938 offsetof(struct bpf_sock_ops_kern, \ 7939 is_fullsock)); \ 7940 *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2); \ 7941 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 7942 struct bpf_sock_ops_kern, sk),\ 7943 reg, si->dst_reg, \ 7944 offsetof(struct bpf_sock_ops_kern, sk));\ 7945 *insn++ = BPF_STX_MEM(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD), \ 7946 reg, si->src_reg, \ 7947 offsetof(OBJ, OBJ_FIELD)); \ 7948 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg, \ 7949 offsetof(struct bpf_sock_ops_kern, \ 7950 temp)); \ 7951 } while (0) 7952 7953 #define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE) \ 7954 do { \ 7955 if (TYPE == BPF_WRITE) \ 7956 SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ 7957 else \ 7958 SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ 7959 } while (0) 7960 7961 if (insn > insn_buf) 7962 return insn - insn_buf; 7963 7964 switch (si->off) { 7965 case offsetof(struct bpf_sock_ops, op) ... 7966 offsetof(struct bpf_sock_ops, replylong[3]): 7967 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, op) != 7968 FIELD_SIZEOF(struct bpf_sock_ops_kern, op)); 7969 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, reply) != 7970 FIELD_SIZEOF(struct bpf_sock_ops_kern, reply)); 7971 BUILD_BUG_ON(FIELD_SIZEOF(struct bpf_sock_ops, replylong) != 7972 FIELD_SIZEOF(struct bpf_sock_ops_kern, replylong)); 7973 off = si->off; 7974 off -= offsetof(struct bpf_sock_ops, op); 7975 off += offsetof(struct bpf_sock_ops_kern, op); 7976 if (type == BPF_WRITE) 7977 *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, 7978 off); 7979 else 7980 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7981 off); 7982 break; 7983 7984 case offsetof(struct bpf_sock_ops, family): 7985 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2); 7986 7987 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 7988 struct bpf_sock_ops_kern, sk), 7989 si->dst_reg, si->src_reg, 7990 offsetof(struct bpf_sock_ops_kern, sk)); 7991 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 7992 offsetof(struct sock_common, skc_family)); 7993 break; 7994 7995 case offsetof(struct bpf_sock_ops, remote_ip4): 7996 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4); 7997 7998 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 7999 struct bpf_sock_ops_kern, sk), 8000 si->dst_reg, si->src_reg, 8001 offsetof(struct bpf_sock_ops_kern, sk)); 8002 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8003 offsetof(struct sock_common, skc_daddr)); 8004 break; 8005 8006 case offsetof(struct bpf_sock_ops, local_ip4): 8007 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, 8008 skc_rcv_saddr) != 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, 8016 skc_rcv_saddr)); 8017 break; 8018 8019 case offsetof(struct bpf_sock_ops, remote_ip6[0]) ... 8020 offsetof(struct bpf_sock_ops, remote_ip6[3]): 8021 #if IS_ENABLED(CONFIG_IPV6) 8022 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, 8023 skc_v6_daddr.s6_addr32[0]) != 4); 8024 8025 off = si->off; 8026 off -= offsetof(struct bpf_sock_ops, remote_ip6[0]); 8027 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8028 struct bpf_sock_ops_kern, sk), 8029 si->dst_reg, si->src_reg, 8030 offsetof(struct bpf_sock_ops_kern, sk)); 8031 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8032 offsetof(struct sock_common, 8033 skc_v6_daddr.s6_addr32[0]) + 8034 off); 8035 #else 8036 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 8037 #endif 8038 break; 8039 8040 case offsetof(struct bpf_sock_ops, local_ip6[0]) ... 8041 offsetof(struct bpf_sock_ops, local_ip6[3]): 8042 #if IS_ENABLED(CONFIG_IPV6) 8043 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, 8044 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 8045 8046 off = si->off; 8047 off -= offsetof(struct bpf_sock_ops, local_ip6[0]); 8048 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8049 struct bpf_sock_ops_kern, sk), 8050 si->dst_reg, si->src_reg, 8051 offsetof(struct bpf_sock_ops_kern, sk)); 8052 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8053 offsetof(struct sock_common, 8054 skc_v6_rcv_saddr.s6_addr32[0]) + 8055 off); 8056 #else 8057 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 8058 #endif 8059 break; 8060 8061 case offsetof(struct bpf_sock_ops, remote_port): 8062 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2); 8063 8064 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8065 struct bpf_sock_ops_kern, sk), 8066 si->dst_reg, si->src_reg, 8067 offsetof(struct bpf_sock_ops_kern, sk)); 8068 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8069 offsetof(struct sock_common, skc_dport)); 8070 #ifndef __BIG_ENDIAN_BITFIELD 8071 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 8072 #endif 8073 break; 8074 8075 case offsetof(struct bpf_sock_ops, local_port): 8076 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2); 8077 8078 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8079 struct bpf_sock_ops_kern, sk), 8080 si->dst_reg, si->src_reg, 8081 offsetof(struct bpf_sock_ops_kern, sk)); 8082 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8083 offsetof(struct sock_common, skc_num)); 8084 break; 8085 8086 case offsetof(struct bpf_sock_ops, is_fullsock): 8087 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8088 struct bpf_sock_ops_kern, 8089 is_fullsock), 8090 si->dst_reg, si->src_reg, 8091 offsetof(struct bpf_sock_ops_kern, 8092 is_fullsock)); 8093 break; 8094 8095 case offsetof(struct bpf_sock_ops, state): 8096 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_state) != 1); 8097 8098 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8099 struct bpf_sock_ops_kern, sk), 8100 si->dst_reg, si->src_reg, 8101 offsetof(struct bpf_sock_ops_kern, sk)); 8102 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg, 8103 offsetof(struct sock_common, skc_state)); 8104 break; 8105 8106 case offsetof(struct bpf_sock_ops, rtt_min): 8107 BUILD_BUG_ON(FIELD_SIZEOF(struct tcp_sock, rtt_min) != 8108 sizeof(struct minmax)); 8109 BUILD_BUG_ON(sizeof(struct minmax) < 8110 sizeof(struct minmax_sample)); 8111 8112 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8113 struct bpf_sock_ops_kern, sk), 8114 si->dst_reg, si->src_reg, 8115 offsetof(struct bpf_sock_ops_kern, sk)); 8116 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8117 offsetof(struct tcp_sock, rtt_min) + 8118 FIELD_SIZEOF(struct minmax_sample, t)); 8119 break; 8120 8121 case offsetof(struct bpf_sock_ops, bpf_sock_ops_cb_flags): 8122 SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags, 8123 struct tcp_sock); 8124 break; 8125 8126 case offsetof(struct bpf_sock_ops, sk_txhash): 8127 SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash, 8128 struct sock, type); 8129 break; 8130 case offsetof(struct bpf_sock_ops, snd_cwnd): 8131 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_cwnd); 8132 break; 8133 case offsetof(struct bpf_sock_ops, srtt_us): 8134 SOCK_OPS_GET_TCP_SOCK_FIELD(srtt_us); 8135 break; 8136 case offsetof(struct bpf_sock_ops, snd_ssthresh): 8137 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_ssthresh); 8138 break; 8139 case offsetof(struct bpf_sock_ops, rcv_nxt): 8140 SOCK_OPS_GET_TCP_SOCK_FIELD(rcv_nxt); 8141 break; 8142 case offsetof(struct bpf_sock_ops, snd_nxt): 8143 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_nxt); 8144 break; 8145 case offsetof(struct bpf_sock_ops, snd_una): 8146 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_una); 8147 break; 8148 case offsetof(struct bpf_sock_ops, mss_cache): 8149 SOCK_OPS_GET_TCP_SOCK_FIELD(mss_cache); 8150 break; 8151 case offsetof(struct bpf_sock_ops, ecn_flags): 8152 SOCK_OPS_GET_TCP_SOCK_FIELD(ecn_flags); 8153 break; 8154 case offsetof(struct bpf_sock_ops, rate_delivered): 8155 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_delivered); 8156 break; 8157 case offsetof(struct bpf_sock_ops, rate_interval_us): 8158 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_interval_us); 8159 break; 8160 case offsetof(struct bpf_sock_ops, packets_out): 8161 SOCK_OPS_GET_TCP_SOCK_FIELD(packets_out); 8162 break; 8163 case offsetof(struct bpf_sock_ops, retrans_out): 8164 SOCK_OPS_GET_TCP_SOCK_FIELD(retrans_out); 8165 break; 8166 case offsetof(struct bpf_sock_ops, total_retrans): 8167 SOCK_OPS_GET_TCP_SOCK_FIELD(total_retrans); 8168 break; 8169 case offsetof(struct bpf_sock_ops, segs_in): 8170 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_in); 8171 break; 8172 case offsetof(struct bpf_sock_ops, data_segs_in): 8173 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_in); 8174 break; 8175 case offsetof(struct bpf_sock_ops, segs_out): 8176 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_out); 8177 break; 8178 case offsetof(struct bpf_sock_ops, data_segs_out): 8179 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_out); 8180 break; 8181 case offsetof(struct bpf_sock_ops, lost_out): 8182 SOCK_OPS_GET_TCP_SOCK_FIELD(lost_out); 8183 break; 8184 case offsetof(struct bpf_sock_ops, sacked_out): 8185 SOCK_OPS_GET_TCP_SOCK_FIELD(sacked_out); 8186 break; 8187 case offsetof(struct bpf_sock_ops, bytes_received): 8188 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_received); 8189 break; 8190 case offsetof(struct bpf_sock_ops, bytes_acked): 8191 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_acked); 8192 break; 8193 case offsetof(struct bpf_sock_ops, sk): 8194 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8195 struct bpf_sock_ops_kern, 8196 is_fullsock), 8197 si->dst_reg, si->src_reg, 8198 offsetof(struct bpf_sock_ops_kern, 8199 is_fullsock)); 8200 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 8201 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8202 struct bpf_sock_ops_kern, sk), 8203 si->dst_reg, si->src_reg, 8204 offsetof(struct bpf_sock_ops_kern, sk)); 8205 break; 8206 } 8207 return insn - insn_buf; 8208 } 8209 8210 static u32 sk_skb_convert_ctx_access(enum bpf_access_type type, 8211 const struct bpf_insn *si, 8212 struct bpf_insn *insn_buf, 8213 struct bpf_prog *prog, u32 *target_size) 8214 { 8215 struct bpf_insn *insn = insn_buf; 8216 int off; 8217 8218 switch (si->off) { 8219 case offsetof(struct __sk_buff, data_end): 8220 off = si->off; 8221 off -= offsetof(struct __sk_buff, data_end); 8222 off += offsetof(struct sk_buff, cb); 8223 off += offsetof(struct tcp_skb_cb, bpf.data_end); 8224 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, 8225 si->src_reg, off); 8226 break; 8227 default: 8228 return bpf_convert_ctx_access(type, si, insn_buf, prog, 8229 target_size); 8230 } 8231 8232 return insn - insn_buf; 8233 } 8234 8235 static u32 sk_msg_convert_ctx_access(enum bpf_access_type type, 8236 const struct bpf_insn *si, 8237 struct bpf_insn *insn_buf, 8238 struct bpf_prog *prog, u32 *target_size) 8239 { 8240 struct bpf_insn *insn = insn_buf; 8241 #if IS_ENABLED(CONFIG_IPV6) 8242 int off; 8243 #endif 8244 8245 /* convert ctx uses the fact sg element is first in struct */ 8246 BUILD_BUG_ON(offsetof(struct sk_msg, sg) != 0); 8247 8248 switch (si->off) { 8249 case offsetof(struct sk_msg_md, data): 8250 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data), 8251 si->dst_reg, si->src_reg, 8252 offsetof(struct sk_msg, data)); 8253 break; 8254 case offsetof(struct sk_msg_md, data_end): 8255 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data_end), 8256 si->dst_reg, si->src_reg, 8257 offsetof(struct sk_msg, data_end)); 8258 break; 8259 case offsetof(struct sk_msg_md, family): 8260 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_family) != 2); 8261 8262 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8263 struct sk_msg, sk), 8264 si->dst_reg, si->src_reg, 8265 offsetof(struct sk_msg, sk)); 8266 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8267 offsetof(struct sock_common, skc_family)); 8268 break; 8269 8270 case offsetof(struct sk_msg_md, remote_ip4): 8271 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_daddr) != 4); 8272 8273 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8274 struct sk_msg, sk), 8275 si->dst_reg, si->src_reg, 8276 offsetof(struct sk_msg, sk)); 8277 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8278 offsetof(struct sock_common, skc_daddr)); 8279 break; 8280 8281 case offsetof(struct sk_msg_md, local_ip4): 8282 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, 8283 skc_rcv_saddr) != 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, 8291 skc_rcv_saddr)); 8292 break; 8293 8294 case offsetof(struct sk_msg_md, remote_ip6[0]) ... 8295 offsetof(struct sk_msg_md, remote_ip6[3]): 8296 #if IS_ENABLED(CONFIG_IPV6) 8297 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, 8298 skc_v6_daddr.s6_addr32[0]) != 4); 8299 8300 off = si->off; 8301 off -= offsetof(struct sk_msg_md, remote_ip6[0]); 8302 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8303 struct sk_msg, sk), 8304 si->dst_reg, si->src_reg, 8305 offsetof(struct sk_msg, sk)); 8306 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8307 offsetof(struct sock_common, 8308 skc_v6_daddr.s6_addr32[0]) + 8309 off); 8310 #else 8311 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 8312 #endif 8313 break; 8314 8315 case offsetof(struct sk_msg_md, local_ip6[0]) ... 8316 offsetof(struct sk_msg_md, local_ip6[3]): 8317 #if IS_ENABLED(CONFIG_IPV6) 8318 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, 8319 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 8320 8321 off = si->off; 8322 off -= offsetof(struct sk_msg_md, local_ip6[0]); 8323 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8324 struct sk_msg, sk), 8325 si->dst_reg, si->src_reg, 8326 offsetof(struct sk_msg, sk)); 8327 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 8328 offsetof(struct sock_common, 8329 skc_v6_rcv_saddr.s6_addr32[0]) + 8330 off); 8331 #else 8332 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 8333 #endif 8334 break; 8335 8336 case offsetof(struct sk_msg_md, remote_port): 8337 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_dport) != 2); 8338 8339 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8340 struct sk_msg, sk), 8341 si->dst_reg, si->src_reg, 8342 offsetof(struct sk_msg, sk)); 8343 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8344 offsetof(struct sock_common, skc_dport)); 8345 #ifndef __BIG_ENDIAN_BITFIELD 8346 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 8347 #endif 8348 break; 8349 8350 case offsetof(struct sk_msg_md, local_port): 8351 BUILD_BUG_ON(FIELD_SIZEOF(struct sock_common, skc_num) != 2); 8352 8353 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 8354 struct sk_msg, sk), 8355 si->dst_reg, si->src_reg, 8356 offsetof(struct sk_msg, sk)); 8357 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 8358 offsetof(struct sock_common, skc_num)); 8359 break; 8360 8361 case offsetof(struct sk_msg_md, size): 8362 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_sg, size), 8363 si->dst_reg, si->src_reg, 8364 offsetof(struct sk_msg_sg, size)); 8365 break; 8366 } 8367 8368 return insn - insn_buf; 8369 } 8370 8371 const struct bpf_verifier_ops sk_filter_verifier_ops = { 8372 .get_func_proto = sk_filter_func_proto, 8373 .is_valid_access = sk_filter_is_valid_access, 8374 .convert_ctx_access = bpf_convert_ctx_access, 8375 .gen_ld_abs = bpf_gen_ld_abs, 8376 }; 8377 8378 const struct bpf_prog_ops sk_filter_prog_ops = { 8379 .test_run = bpf_prog_test_run_skb, 8380 }; 8381 8382 const struct bpf_verifier_ops tc_cls_act_verifier_ops = { 8383 .get_func_proto = tc_cls_act_func_proto, 8384 .is_valid_access = tc_cls_act_is_valid_access, 8385 .convert_ctx_access = tc_cls_act_convert_ctx_access, 8386 .gen_prologue = tc_cls_act_prologue, 8387 .gen_ld_abs = bpf_gen_ld_abs, 8388 }; 8389 8390 const struct bpf_prog_ops tc_cls_act_prog_ops = { 8391 .test_run = bpf_prog_test_run_skb, 8392 }; 8393 8394 const struct bpf_verifier_ops xdp_verifier_ops = { 8395 .get_func_proto = xdp_func_proto, 8396 .is_valid_access = xdp_is_valid_access, 8397 .convert_ctx_access = xdp_convert_ctx_access, 8398 .gen_prologue = bpf_noop_prologue, 8399 }; 8400 8401 const struct bpf_prog_ops xdp_prog_ops = { 8402 .test_run = bpf_prog_test_run_xdp, 8403 }; 8404 8405 const struct bpf_verifier_ops cg_skb_verifier_ops = { 8406 .get_func_proto = cg_skb_func_proto, 8407 .is_valid_access = cg_skb_is_valid_access, 8408 .convert_ctx_access = bpf_convert_ctx_access, 8409 }; 8410 8411 const struct bpf_prog_ops cg_skb_prog_ops = { 8412 .test_run = bpf_prog_test_run_skb, 8413 }; 8414 8415 const struct bpf_verifier_ops lwt_in_verifier_ops = { 8416 .get_func_proto = lwt_in_func_proto, 8417 .is_valid_access = lwt_is_valid_access, 8418 .convert_ctx_access = bpf_convert_ctx_access, 8419 }; 8420 8421 const struct bpf_prog_ops lwt_in_prog_ops = { 8422 .test_run = bpf_prog_test_run_skb, 8423 }; 8424 8425 const struct bpf_verifier_ops lwt_out_verifier_ops = { 8426 .get_func_proto = lwt_out_func_proto, 8427 .is_valid_access = lwt_is_valid_access, 8428 .convert_ctx_access = bpf_convert_ctx_access, 8429 }; 8430 8431 const struct bpf_prog_ops lwt_out_prog_ops = { 8432 .test_run = bpf_prog_test_run_skb, 8433 }; 8434 8435 const struct bpf_verifier_ops lwt_xmit_verifier_ops = { 8436 .get_func_proto = lwt_xmit_func_proto, 8437 .is_valid_access = lwt_is_valid_access, 8438 .convert_ctx_access = bpf_convert_ctx_access, 8439 .gen_prologue = tc_cls_act_prologue, 8440 }; 8441 8442 const struct bpf_prog_ops lwt_xmit_prog_ops = { 8443 .test_run = bpf_prog_test_run_skb, 8444 }; 8445 8446 const struct bpf_verifier_ops lwt_seg6local_verifier_ops = { 8447 .get_func_proto = lwt_seg6local_func_proto, 8448 .is_valid_access = lwt_is_valid_access, 8449 .convert_ctx_access = bpf_convert_ctx_access, 8450 }; 8451 8452 const struct bpf_prog_ops lwt_seg6local_prog_ops = { 8453 .test_run = bpf_prog_test_run_skb, 8454 }; 8455 8456 const struct bpf_verifier_ops cg_sock_verifier_ops = { 8457 .get_func_proto = sock_filter_func_proto, 8458 .is_valid_access = sock_filter_is_valid_access, 8459 .convert_ctx_access = bpf_sock_convert_ctx_access, 8460 }; 8461 8462 const struct bpf_prog_ops cg_sock_prog_ops = { 8463 }; 8464 8465 const struct bpf_verifier_ops cg_sock_addr_verifier_ops = { 8466 .get_func_proto = sock_addr_func_proto, 8467 .is_valid_access = sock_addr_is_valid_access, 8468 .convert_ctx_access = sock_addr_convert_ctx_access, 8469 }; 8470 8471 const struct bpf_prog_ops cg_sock_addr_prog_ops = { 8472 }; 8473 8474 const struct bpf_verifier_ops sock_ops_verifier_ops = { 8475 .get_func_proto = sock_ops_func_proto, 8476 .is_valid_access = sock_ops_is_valid_access, 8477 .convert_ctx_access = sock_ops_convert_ctx_access, 8478 }; 8479 8480 const struct bpf_prog_ops sock_ops_prog_ops = { 8481 }; 8482 8483 const struct bpf_verifier_ops sk_skb_verifier_ops = { 8484 .get_func_proto = sk_skb_func_proto, 8485 .is_valid_access = sk_skb_is_valid_access, 8486 .convert_ctx_access = sk_skb_convert_ctx_access, 8487 .gen_prologue = sk_skb_prologue, 8488 }; 8489 8490 const struct bpf_prog_ops sk_skb_prog_ops = { 8491 }; 8492 8493 const struct bpf_verifier_ops sk_msg_verifier_ops = { 8494 .get_func_proto = sk_msg_func_proto, 8495 .is_valid_access = sk_msg_is_valid_access, 8496 .convert_ctx_access = sk_msg_convert_ctx_access, 8497 .gen_prologue = bpf_noop_prologue, 8498 }; 8499 8500 const struct bpf_prog_ops sk_msg_prog_ops = { 8501 }; 8502 8503 const struct bpf_verifier_ops flow_dissector_verifier_ops = { 8504 .get_func_proto = flow_dissector_func_proto, 8505 .is_valid_access = flow_dissector_is_valid_access, 8506 .convert_ctx_access = flow_dissector_convert_ctx_access, 8507 }; 8508 8509 const struct bpf_prog_ops flow_dissector_prog_ops = { 8510 .test_run = bpf_prog_test_run_flow_dissector, 8511 }; 8512 8513 int sk_detach_filter(struct sock *sk) 8514 { 8515 int ret = -ENOENT; 8516 struct sk_filter *filter; 8517 8518 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 8519 return -EPERM; 8520 8521 filter = rcu_dereference_protected(sk->sk_filter, 8522 lockdep_sock_is_held(sk)); 8523 if (filter) { 8524 RCU_INIT_POINTER(sk->sk_filter, NULL); 8525 sk_filter_uncharge(sk, filter); 8526 ret = 0; 8527 } 8528 8529 return ret; 8530 } 8531 EXPORT_SYMBOL_GPL(sk_detach_filter); 8532 8533 int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf, 8534 unsigned int len) 8535 { 8536 struct sock_fprog_kern *fprog; 8537 struct sk_filter *filter; 8538 int ret = 0; 8539 8540 lock_sock(sk); 8541 filter = rcu_dereference_protected(sk->sk_filter, 8542 lockdep_sock_is_held(sk)); 8543 if (!filter) 8544 goto out; 8545 8546 /* We're copying the filter that has been originally attached, 8547 * so no conversion/decode needed anymore. eBPF programs that 8548 * have no original program cannot be dumped through this. 8549 */ 8550 ret = -EACCES; 8551 fprog = filter->prog->orig_prog; 8552 if (!fprog) 8553 goto out; 8554 8555 ret = fprog->len; 8556 if (!len) 8557 /* User space only enquires number of filter blocks. */ 8558 goto out; 8559 8560 ret = -EINVAL; 8561 if (len < fprog->len) 8562 goto out; 8563 8564 ret = -EFAULT; 8565 if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog))) 8566 goto out; 8567 8568 /* Instead of bytes, the API requests to return the number 8569 * of filter blocks. 8570 */ 8571 ret = fprog->len; 8572 out: 8573 release_sock(sk); 8574 return ret; 8575 } 8576 8577 #ifdef CONFIG_INET 8578 struct sk_reuseport_kern { 8579 struct sk_buff *skb; 8580 struct sock *sk; 8581 struct sock *selected_sk; 8582 void *data_end; 8583 u32 hash; 8584 u32 reuseport_id; 8585 bool bind_inany; 8586 }; 8587 8588 static void bpf_init_reuseport_kern(struct sk_reuseport_kern *reuse_kern, 8589 struct sock_reuseport *reuse, 8590 struct sock *sk, struct sk_buff *skb, 8591 u32 hash) 8592 { 8593 reuse_kern->skb = skb; 8594 reuse_kern->sk = sk; 8595 reuse_kern->selected_sk = NULL; 8596 reuse_kern->data_end = skb->data + skb_headlen(skb); 8597 reuse_kern->hash = hash; 8598 reuse_kern->reuseport_id = reuse->reuseport_id; 8599 reuse_kern->bind_inany = reuse->bind_inany; 8600 } 8601 8602 struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk, 8603 struct bpf_prog *prog, struct sk_buff *skb, 8604 u32 hash) 8605 { 8606 struct sk_reuseport_kern reuse_kern; 8607 enum sk_action action; 8608 8609 bpf_init_reuseport_kern(&reuse_kern, reuse, sk, skb, hash); 8610 action = BPF_PROG_RUN(prog, &reuse_kern); 8611 8612 if (action == SK_PASS) 8613 return reuse_kern.selected_sk; 8614 else 8615 return ERR_PTR(-ECONNREFUSED); 8616 } 8617 8618 BPF_CALL_4(sk_select_reuseport, struct sk_reuseport_kern *, reuse_kern, 8619 struct bpf_map *, map, void *, key, u32, flags) 8620 { 8621 struct sock_reuseport *reuse; 8622 struct sock *selected_sk; 8623 8624 selected_sk = map->ops->map_lookup_elem(map, key); 8625 if (!selected_sk) 8626 return -ENOENT; 8627 8628 reuse = rcu_dereference(selected_sk->sk_reuseport_cb); 8629 if (!reuse) 8630 /* selected_sk is unhashed (e.g. by close()) after the 8631 * above map_lookup_elem(). Treat selected_sk has already 8632 * been removed from the map. 8633 */ 8634 return -ENOENT; 8635 8636 if (unlikely(reuse->reuseport_id != reuse_kern->reuseport_id)) { 8637 struct sock *sk; 8638 8639 if (unlikely(!reuse_kern->reuseport_id)) 8640 /* There is a small race between adding the 8641 * sk to the map and setting the 8642 * reuse_kern->reuseport_id. 8643 * Treat it as the sk has not been added to 8644 * the bpf map yet. 8645 */ 8646 return -ENOENT; 8647 8648 sk = reuse_kern->sk; 8649 if (sk->sk_protocol != selected_sk->sk_protocol) 8650 return -EPROTOTYPE; 8651 else if (sk->sk_family != selected_sk->sk_family) 8652 return -EAFNOSUPPORT; 8653 8654 /* Catch all. Likely bound to a different sockaddr. */ 8655 return -EBADFD; 8656 } 8657 8658 reuse_kern->selected_sk = selected_sk; 8659 8660 return 0; 8661 } 8662 8663 static const struct bpf_func_proto sk_select_reuseport_proto = { 8664 .func = sk_select_reuseport, 8665 .gpl_only = false, 8666 .ret_type = RET_INTEGER, 8667 .arg1_type = ARG_PTR_TO_CTX, 8668 .arg2_type = ARG_CONST_MAP_PTR, 8669 .arg3_type = ARG_PTR_TO_MAP_KEY, 8670 .arg4_type = ARG_ANYTHING, 8671 }; 8672 8673 BPF_CALL_4(sk_reuseport_load_bytes, 8674 const struct sk_reuseport_kern *, reuse_kern, u32, offset, 8675 void *, to, u32, len) 8676 { 8677 return ____bpf_skb_load_bytes(reuse_kern->skb, offset, to, len); 8678 } 8679 8680 static const struct bpf_func_proto sk_reuseport_load_bytes_proto = { 8681 .func = sk_reuseport_load_bytes, 8682 .gpl_only = false, 8683 .ret_type = RET_INTEGER, 8684 .arg1_type = ARG_PTR_TO_CTX, 8685 .arg2_type = ARG_ANYTHING, 8686 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 8687 .arg4_type = ARG_CONST_SIZE, 8688 }; 8689 8690 BPF_CALL_5(sk_reuseport_load_bytes_relative, 8691 const struct sk_reuseport_kern *, reuse_kern, u32, offset, 8692 void *, to, u32, len, u32, start_header) 8693 { 8694 return ____bpf_skb_load_bytes_relative(reuse_kern->skb, offset, to, 8695 len, start_header); 8696 } 8697 8698 static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto = { 8699 .func = sk_reuseport_load_bytes_relative, 8700 .gpl_only = false, 8701 .ret_type = RET_INTEGER, 8702 .arg1_type = ARG_PTR_TO_CTX, 8703 .arg2_type = ARG_ANYTHING, 8704 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 8705 .arg4_type = ARG_CONST_SIZE, 8706 .arg5_type = ARG_ANYTHING, 8707 }; 8708 8709 static const struct bpf_func_proto * 8710 sk_reuseport_func_proto(enum bpf_func_id func_id, 8711 const struct bpf_prog *prog) 8712 { 8713 switch (func_id) { 8714 case BPF_FUNC_sk_select_reuseport: 8715 return &sk_select_reuseport_proto; 8716 case BPF_FUNC_skb_load_bytes: 8717 return &sk_reuseport_load_bytes_proto; 8718 case BPF_FUNC_skb_load_bytes_relative: 8719 return &sk_reuseport_load_bytes_relative_proto; 8720 default: 8721 return bpf_base_func_proto(func_id); 8722 } 8723 } 8724 8725 static bool 8726 sk_reuseport_is_valid_access(int off, int size, 8727 enum bpf_access_type type, 8728 const struct bpf_prog *prog, 8729 struct bpf_insn_access_aux *info) 8730 { 8731 const u32 size_default = sizeof(__u32); 8732 8733 if (off < 0 || off >= sizeof(struct sk_reuseport_md) || 8734 off % size || type != BPF_READ) 8735 return false; 8736 8737 switch (off) { 8738 case offsetof(struct sk_reuseport_md, data): 8739 info->reg_type = PTR_TO_PACKET; 8740 return size == sizeof(__u64); 8741 8742 case offsetof(struct sk_reuseport_md, data_end): 8743 info->reg_type = PTR_TO_PACKET_END; 8744 return size == sizeof(__u64); 8745 8746 case offsetof(struct sk_reuseport_md, hash): 8747 return size == size_default; 8748 8749 /* Fields that allow narrowing */ 8750 case offsetof(struct sk_reuseport_md, eth_protocol): 8751 if (size < FIELD_SIZEOF(struct sk_buff, protocol)) 8752 return false; 8753 /* fall through */ 8754 case offsetof(struct sk_reuseport_md, ip_protocol): 8755 case offsetof(struct sk_reuseport_md, bind_inany): 8756 case offsetof(struct sk_reuseport_md, len): 8757 bpf_ctx_record_field_size(info, size_default); 8758 return bpf_ctx_narrow_access_ok(off, size, size_default); 8759 8760 default: 8761 return false; 8762 } 8763 } 8764 8765 #define SK_REUSEPORT_LOAD_FIELD(F) ({ \ 8766 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \ 8767 si->dst_reg, si->src_reg, \ 8768 bpf_target_off(struct sk_reuseport_kern, F, \ 8769 FIELD_SIZEOF(struct sk_reuseport_kern, F), \ 8770 target_size)); \ 8771 }) 8772 8773 #define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD) \ 8774 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \ 8775 struct sk_buff, \ 8776 skb, \ 8777 SKB_FIELD) 8778 8779 #define SK_REUSEPORT_LOAD_SK_FIELD_SIZE_OFF(SK_FIELD, BPF_SIZE, EXTRA_OFF) \ 8780 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(struct sk_reuseport_kern, \ 8781 struct sock, \ 8782 sk, \ 8783 SK_FIELD, BPF_SIZE, EXTRA_OFF) 8784 8785 static u32 sk_reuseport_convert_ctx_access(enum bpf_access_type type, 8786 const struct bpf_insn *si, 8787 struct bpf_insn *insn_buf, 8788 struct bpf_prog *prog, 8789 u32 *target_size) 8790 { 8791 struct bpf_insn *insn = insn_buf; 8792 8793 switch (si->off) { 8794 case offsetof(struct sk_reuseport_md, data): 8795 SK_REUSEPORT_LOAD_SKB_FIELD(data); 8796 break; 8797 8798 case offsetof(struct sk_reuseport_md, len): 8799 SK_REUSEPORT_LOAD_SKB_FIELD(len); 8800 break; 8801 8802 case offsetof(struct sk_reuseport_md, eth_protocol): 8803 SK_REUSEPORT_LOAD_SKB_FIELD(protocol); 8804 break; 8805 8806 case offsetof(struct sk_reuseport_md, ip_protocol): 8807 BUILD_BUG_ON(HWEIGHT32(SK_FL_PROTO_MASK) != BITS_PER_BYTE); 8808 SK_REUSEPORT_LOAD_SK_FIELD_SIZE_OFF(__sk_flags_offset, 8809 BPF_W, 0); 8810 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK); 8811 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 8812 SK_FL_PROTO_SHIFT); 8813 /* SK_FL_PROTO_MASK and SK_FL_PROTO_SHIFT are endian 8814 * aware. No further narrowing or masking is needed. 8815 */ 8816 *target_size = 1; 8817 break; 8818 8819 case offsetof(struct sk_reuseport_md, data_end): 8820 SK_REUSEPORT_LOAD_FIELD(data_end); 8821 break; 8822 8823 case offsetof(struct sk_reuseport_md, hash): 8824 SK_REUSEPORT_LOAD_FIELD(hash); 8825 break; 8826 8827 case offsetof(struct sk_reuseport_md, bind_inany): 8828 SK_REUSEPORT_LOAD_FIELD(bind_inany); 8829 break; 8830 } 8831 8832 return insn - insn_buf; 8833 } 8834 8835 const struct bpf_verifier_ops sk_reuseport_verifier_ops = { 8836 .get_func_proto = sk_reuseport_func_proto, 8837 .is_valid_access = sk_reuseport_is_valid_access, 8838 .convert_ctx_access = sk_reuseport_convert_ctx_access, 8839 }; 8840 8841 const struct bpf_prog_ops sk_reuseport_prog_ops = { 8842 }; 8843 #endif /* CONFIG_INET */ 8844