1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Linux Socket Filter - Kernel level socket filtering 4 * 5 * Based on the design of the Berkeley Packet Filter. The new 6 * internal format has been designed by PLUMgrid: 7 * 8 * Copyright (c) 2011 - 2014 PLUMgrid, http://plumgrid.com 9 * 10 * Authors: 11 * 12 * Jay Schulist <jschlst@samba.org> 13 * Alexei Starovoitov <ast@plumgrid.com> 14 * Daniel Borkmann <dborkman@redhat.com> 15 * 16 * Andi Kleen - Fix a few bad bugs and races. 17 * Kris Katterjohn - Added many additional checks in bpf_check_classic() 18 */ 19 20 #include <linux/atomic.h> 21 #include <linux/bpf_verifier.h> 22 #include <linux/module.h> 23 #include <linux/types.h> 24 #include <linux/mm.h> 25 #include <linux/fcntl.h> 26 #include <linux/socket.h> 27 #include <linux/sock_diag.h> 28 #include <linux/in.h> 29 #include <linux/inet.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_packet.h> 32 #include <linux/if_arp.h> 33 #include <linux/gfp.h> 34 #include <net/inet_common.h> 35 #include <net/ip.h> 36 #include <net/protocol.h> 37 #include <net/netlink.h> 38 #include <linux/skbuff.h> 39 #include <linux/skmsg.h> 40 #include <net/sock.h> 41 #include <net/flow_dissector.h> 42 #include <linux/errno.h> 43 #include <linux/timer.h> 44 #include <linux/uaccess.h> 45 #include <asm/unaligned.h> 46 #include <linux/filter.h> 47 #include <linux/ratelimit.h> 48 #include <linux/seccomp.h> 49 #include <linux/if_vlan.h> 50 #include <linux/bpf.h> 51 #include <linux/btf.h> 52 #include <net/sch_generic.h> 53 #include <net/cls_cgroup.h> 54 #include <net/dst_metadata.h> 55 #include <net/dst.h> 56 #include <net/sock_reuseport.h> 57 #include <net/busy_poll.h> 58 #include <net/tcp.h> 59 #include <net/xfrm.h> 60 #include <net/udp.h> 61 #include <linux/bpf_trace.h> 62 #include <net/xdp_sock.h> 63 #include <linux/inetdevice.h> 64 #include <net/inet_hashtables.h> 65 #include <net/inet6_hashtables.h> 66 #include <net/ip_fib.h> 67 #include <net/nexthop.h> 68 #include <net/flow.h> 69 #include <net/arp.h> 70 #include <net/ipv6.h> 71 #include <net/net_namespace.h> 72 #include <linux/seg6_local.h> 73 #include <net/seg6.h> 74 #include <net/seg6_local.h> 75 #include <net/lwtunnel.h> 76 #include <net/ipv6_stubs.h> 77 #include <net/bpf_sk_storage.h> 78 #include <net/transp_v6.h> 79 #include <linux/btf_ids.h> 80 #include <net/tls.h> 81 #include <net/xdp.h> 82 #include <net/mptcp.h> 83 #include <net/netfilter/nf_conntrack_bpf.h> 84 85 static const struct bpf_func_proto * 86 bpf_sk_base_func_proto(enum bpf_func_id func_id); 87 88 int copy_bpf_fprog_from_user(struct sock_fprog *dst, sockptr_t src, int len) 89 { 90 if (in_compat_syscall()) { 91 struct compat_sock_fprog f32; 92 93 if (len != sizeof(f32)) 94 return -EINVAL; 95 if (copy_from_sockptr(&f32, src, sizeof(f32))) 96 return -EFAULT; 97 memset(dst, 0, sizeof(*dst)); 98 dst->len = f32.len; 99 dst->filter = compat_ptr(f32.filter); 100 } else { 101 if (len != sizeof(*dst)) 102 return -EINVAL; 103 if (copy_from_sockptr(dst, src, sizeof(*dst))) 104 return -EFAULT; 105 } 106 107 return 0; 108 } 109 EXPORT_SYMBOL_GPL(copy_bpf_fprog_from_user); 110 111 /** 112 * sk_filter_trim_cap - run a packet through a socket filter 113 * @sk: sock associated with &sk_buff 114 * @skb: buffer to filter 115 * @cap: limit on how short the eBPF program may trim the packet 116 * 117 * Run the eBPF program and then cut skb->data to correct size returned by 118 * the program. If pkt_len is 0 we toss packet. If skb->len is smaller 119 * than pkt_len we keep whole skb->data. This is the socket level 120 * wrapper to bpf_prog_run. It returns 0 if the packet should 121 * be accepted or -EPERM if the packet should be tossed. 122 * 123 */ 124 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap) 125 { 126 int err; 127 struct sk_filter *filter; 128 129 /* 130 * If the skb was allocated from pfmemalloc reserves, only 131 * allow SOCK_MEMALLOC sockets to use it as this socket is 132 * helping free memory 133 */ 134 if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) { 135 NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP); 136 return -ENOMEM; 137 } 138 err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb); 139 if (err) 140 return err; 141 142 err = security_sock_rcv_skb(sk, skb); 143 if (err) 144 return err; 145 146 rcu_read_lock(); 147 filter = rcu_dereference(sk->sk_filter); 148 if (filter) { 149 struct sock *save_sk = skb->sk; 150 unsigned int pkt_len; 151 152 skb->sk = sk; 153 pkt_len = bpf_prog_run_save_cb(filter->prog, skb); 154 skb->sk = save_sk; 155 err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM; 156 } 157 rcu_read_unlock(); 158 159 return err; 160 } 161 EXPORT_SYMBOL(sk_filter_trim_cap); 162 163 BPF_CALL_1(bpf_skb_get_pay_offset, struct sk_buff *, skb) 164 { 165 return skb_get_poff(skb); 166 } 167 168 BPF_CALL_3(bpf_skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x) 169 { 170 struct nlattr *nla; 171 172 if (skb_is_nonlinear(skb)) 173 return 0; 174 175 if (skb->len < sizeof(struct nlattr)) 176 return 0; 177 178 if (a > skb->len - sizeof(struct nlattr)) 179 return 0; 180 181 nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x); 182 if (nla) 183 return (void *) nla - (void *) skb->data; 184 185 return 0; 186 } 187 188 BPF_CALL_3(bpf_skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x) 189 { 190 struct nlattr *nla; 191 192 if (skb_is_nonlinear(skb)) 193 return 0; 194 195 if (skb->len < sizeof(struct nlattr)) 196 return 0; 197 198 if (a > skb->len - sizeof(struct nlattr)) 199 return 0; 200 201 nla = (struct nlattr *) &skb->data[a]; 202 if (nla->nla_len > skb->len - a) 203 return 0; 204 205 nla = nla_find_nested(nla, x); 206 if (nla) 207 return (void *) nla - (void *) skb->data; 208 209 return 0; 210 } 211 212 BPF_CALL_4(bpf_skb_load_helper_8, const struct sk_buff *, skb, const void *, 213 data, int, headlen, int, offset) 214 { 215 u8 tmp, *ptr; 216 const int len = sizeof(tmp); 217 218 if (offset >= 0) { 219 if (headlen - offset >= len) 220 return *(u8 *)(data + offset); 221 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 222 return tmp; 223 } else { 224 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 225 if (likely(ptr)) 226 return *(u8 *)ptr; 227 } 228 229 return -EFAULT; 230 } 231 232 BPF_CALL_2(bpf_skb_load_helper_8_no_cache, const struct sk_buff *, skb, 233 int, offset) 234 { 235 return ____bpf_skb_load_helper_8(skb, skb->data, skb->len - skb->data_len, 236 offset); 237 } 238 239 BPF_CALL_4(bpf_skb_load_helper_16, const struct sk_buff *, skb, const void *, 240 data, int, headlen, int, offset) 241 { 242 __be16 tmp, *ptr; 243 const int len = sizeof(tmp); 244 245 if (offset >= 0) { 246 if (headlen - offset >= len) 247 return get_unaligned_be16(data + offset); 248 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 249 return be16_to_cpu(tmp); 250 } else { 251 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 252 if (likely(ptr)) 253 return get_unaligned_be16(ptr); 254 } 255 256 return -EFAULT; 257 } 258 259 BPF_CALL_2(bpf_skb_load_helper_16_no_cache, const struct sk_buff *, skb, 260 int, offset) 261 { 262 return ____bpf_skb_load_helper_16(skb, skb->data, skb->len - skb->data_len, 263 offset); 264 } 265 266 BPF_CALL_4(bpf_skb_load_helper_32, const struct sk_buff *, skb, const void *, 267 data, int, headlen, int, offset) 268 { 269 __be32 tmp, *ptr; 270 const int len = sizeof(tmp); 271 272 if (likely(offset >= 0)) { 273 if (headlen - offset >= len) 274 return get_unaligned_be32(data + offset); 275 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 276 return be32_to_cpu(tmp); 277 } else { 278 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 279 if (likely(ptr)) 280 return get_unaligned_be32(ptr); 281 } 282 283 return -EFAULT; 284 } 285 286 BPF_CALL_2(bpf_skb_load_helper_32_no_cache, const struct sk_buff *, skb, 287 int, offset) 288 { 289 return ____bpf_skb_load_helper_32(skb, skb->data, skb->len - skb->data_len, 290 offset); 291 } 292 293 static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg, 294 struct bpf_insn *insn_buf) 295 { 296 struct bpf_insn *insn = insn_buf; 297 298 switch (skb_field) { 299 case SKF_AD_MARK: 300 BUILD_BUG_ON(sizeof_field(struct sk_buff, mark) != 4); 301 302 *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg, 303 offsetof(struct sk_buff, mark)); 304 break; 305 306 case SKF_AD_PKTTYPE: 307 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET); 308 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX); 309 #ifdef __BIG_ENDIAN_BITFIELD 310 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5); 311 #endif 312 break; 313 314 case SKF_AD_QUEUE: 315 BUILD_BUG_ON(sizeof_field(struct sk_buff, queue_mapping) != 2); 316 317 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, 318 offsetof(struct sk_buff, queue_mapping)); 319 break; 320 321 case SKF_AD_VLAN_TAG: 322 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_tci) != 2); 323 324 /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */ 325 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, 326 offsetof(struct sk_buff, vlan_tci)); 327 break; 328 case SKF_AD_VLAN_TAG_PRESENT: 329 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_all) != 4); 330 *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg, 331 offsetof(struct sk_buff, vlan_all)); 332 *insn++ = BPF_JMP_IMM(BPF_JEQ, dst_reg, 0, 1); 333 *insn++ = BPF_ALU32_IMM(BPF_MOV, dst_reg, 1); 334 break; 335 } 336 337 return insn - insn_buf; 338 } 339 340 static bool convert_bpf_extensions(struct sock_filter *fp, 341 struct bpf_insn **insnp) 342 { 343 struct bpf_insn *insn = *insnp; 344 u32 cnt; 345 346 switch (fp->k) { 347 case SKF_AD_OFF + SKF_AD_PROTOCOL: 348 BUILD_BUG_ON(sizeof_field(struct sk_buff, protocol) != 2); 349 350 /* A = *(u16 *) (CTX + offsetof(protocol)) */ 351 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, 352 offsetof(struct sk_buff, protocol)); 353 /* A = ntohs(A) [emitting a nop or swap16] */ 354 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); 355 break; 356 357 case SKF_AD_OFF + SKF_AD_PKTTYPE: 358 cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn); 359 insn += cnt - 1; 360 break; 361 362 case SKF_AD_OFF + SKF_AD_IFINDEX: 363 case SKF_AD_OFF + SKF_AD_HATYPE: 364 BUILD_BUG_ON(sizeof_field(struct net_device, ifindex) != 4); 365 BUILD_BUG_ON(sizeof_field(struct net_device, type) != 2); 366 367 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 368 BPF_REG_TMP, BPF_REG_CTX, 369 offsetof(struct sk_buff, dev)); 370 /* if (tmp != 0) goto pc + 1 */ 371 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1); 372 *insn++ = BPF_EXIT_INSN(); 373 if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX) 374 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP, 375 offsetof(struct net_device, ifindex)); 376 else 377 *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP, 378 offsetof(struct net_device, type)); 379 break; 380 381 case SKF_AD_OFF + SKF_AD_MARK: 382 cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn); 383 insn += cnt - 1; 384 break; 385 386 case SKF_AD_OFF + SKF_AD_RXHASH: 387 BUILD_BUG_ON(sizeof_field(struct sk_buff, hash) != 4); 388 389 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, 390 offsetof(struct sk_buff, hash)); 391 break; 392 393 case SKF_AD_OFF + SKF_AD_QUEUE: 394 cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn); 395 insn += cnt - 1; 396 break; 397 398 case SKF_AD_OFF + SKF_AD_VLAN_TAG: 399 cnt = convert_skb_access(SKF_AD_VLAN_TAG, 400 BPF_REG_A, BPF_REG_CTX, insn); 401 insn += cnt - 1; 402 break; 403 404 case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT: 405 cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT, 406 BPF_REG_A, BPF_REG_CTX, insn); 407 insn += cnt - 1; 408 break; 409 410 case SKF_AD_OFF + SKF_AD_VLAN_TPID: 411 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_proto) != 2); 412 413 /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */ 414 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, 415 offsetof(struct sk_buff, vlan_proto)); 416 /* A = ntohs(A) [emitting a nop or swap16] */ 417 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); 418 break; 419 420 case SKF_AD_OFF + SKF_AD_PAY_OFFSET: 421 case SKF_AD_OFF + SKF_AD_NLATTR: 422 case SKF_AD_OFF + SKF_AD_NLATTR_NEST: 423 case SKF_AD_OFF + SKF_AD_CPU: 424 case SKF_AD_OFF + SKF_AD_RANDOM: 425 /* arg1 = CTX */ 426 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); 427 /* arg2 = A */ 428 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A); 429 /* arg3 = X */ 430 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X); 431 /* Emit call(arg1=CTX, arg2=A, arg3=X) */ 432 switch (fp->k) { 433 case SKF_AD_OFF + SKF_AD_PAY_OFFSET: 434 *insn = BPF_EMIT_CALL(bpf_skb_get_pay_offset); 435 break; 436 case SKF_AD_OFF + SKF_AD_NLATTR: 437 *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr); 438 break; 439 case SKF_AD_OFF + SKF_AD_NLATTR_NEST: 440 *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr_nest); 441 break; 442 case SKF_AD_OFF + SKF_AD_CPU: 443 *insn = BPF_EMIT_CALL(bpf_get_raw_cpu_id); 444 break; 445 case SKF_AD_OFF + SKF_AD_RANDOM: 446 *insn = BPF_EMIT_CALL(bpf_user_rnd_u32); 447 bpf_user_rnd_init_once(); 448 break; 449 } 450 break; 451 452 case SKF_AD_OFF + SKF_AD_ALU_XOR_X: 453 /* A ^= X */ 454 *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X); 455 break; 456 457 default: 458 /* This is just a dummy call to avoid letting the compiler 459 * evict __bpf_call_base() as an optimization. Placed here 460 * where no-one bothers. 461 */ 462 BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0); 463 return false; 464 } 465 466 *insnp = insn; 467 return true; 468 } 469 470 static bool convert_bpf_ld_abs(struct sock_filter *fp, struct bpf_insn **insnp) 471 { 472 const bool unaligned_ok = IS_BUILTIN(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS); 473 int size = bpf_size_to_bytes(BPF_SIZE(fp->code)); 474 bool endian = BPF_SIZE(fp->code) == BPF_H || 475 BPF_SIZE(fp->code) == BPF_W; 476 bool indirect = BPF_MODE(fp->code) == BPF_IND; 477 const int ip_align = NET_IP_ALIGN; 478 struct bpf_insn *insn = *insnp; 479 int offset = fp->k; 480 481 if (!indirect && 482 ((unaligned_ok && offset >= 0) || 483 (!unaligned_ok && offset >= 0 && 484 offset + ip_align >= 0 && 485 offset + ip_align % size == 0))) { 486 bool ldx_off_ok = offset <= S16_MAX; 487 488 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_H); 489 if (offset) 490 *insn++ = BPF_ALU64_IMM(BPF_SUB, BPF_REG_TMP, offset); 491 *insn++ = BPF_JMP_IMM(BPF_JSLT, BPF_REG_TMP, 492 size, 2 + endian + (!ldx_off_ok * 2)); 493 if (ldx_off_ok) { 494 *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, 495 BPF_REG_D, offset); 496 } else { 497 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_D); 498 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_TMP, offset); 499 *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, 500 BPF_REG_TMP, 0); 501 } 502 if (endian) 503 *insn++ = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, size * 8); 504 *insn++ = BPF_JMP_A(8); 505 } 506 507 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); 508 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_D); 509 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_H); 510 if (!indirect) { 511 *insn++ = BPF_MOV64_IMM(BPF_REG_ARG4, offset); 512 } else { 513 *insn++ = BPF_MOV64_REG(BPF_REG_ARG4, BPF_REG_X); 514 if (fp->k) 515 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_ARG4, offset); 516 } 517 518 switch (BPF_SIZE(fp->code)) { 519 case BPF_B: 520 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8); 521 break; 522 case BPF_H: 523 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16); 524 break; 525 case BPF_W: 526 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32); 527 break; 528 default: 529 return false; 530 } 531 532 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_A, 0, 2); 533 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 534 *insn = BPF_EXIT_INSN(); 535 536 *insnp = insn; 537 return true; 538 } 539 540 /** 541 * bpf_convert_filter - convert filter program 542 * @prog: the user passed filter program 543 * @len: the length of the user passed filter program 544 * @new_prog: allocated 'struct bpf_prog' or NULL 545 * @new_len: pointer to store length of converted program 546 * @seen_ld_abs: bool whether we've seen ld_abs/ind 547 * 548 * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn' 549 * style extended BPF (eBPF). 550 * Conversion workflow: 551 * 552 * 1) First pass for calculating the new program length: 553 * bpf_convert_filter(old_prog, old_len, NULL, &new_len, &seen_ld_abs) 554 * 555 * 2) 2nd pass to remap in two passes: 1st pass finds new 556 * jump offsets, 2nd pass remapping: 557 * bpf_convert_filter(old_prog, old_len, new_prog, &new_len, &seen_ld_abs) 558 */ 559 static int bpf_convert_filter(struct sock_filter *prog, int len, 560 struct bpf_prog *new_prog, int *new_len, 561 bool *seen_ld_abs) 562 { 563 int new_flen = 0, pass = 0, target, i, stack_off; 564 struct bpf_insn *new_insn, *first_insn = NULL; 565 struct sock_filter *fp; 566 int *addrs = NULL; 567 u8 bpf_src; 568 569 BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK); 570 BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG); 571 572 if (len <= 0 || len > BPF_MAXINSNS) 573 return -EINVAL; 574 575 if (new_prog) { 576 first_insn = new_prog->insnsi; 577 addrs = kcalloc(len, sizeof(*addrs), 578 GFP_KERNEL | __GFP_NOWARN); 579 if (!addrs) 580 return -ENOMEM; 581 } 582 583 do_pass: 584 new_insn = first_insn; 585 fp = prog; 586 587 /* Classic BPF related prologue emission. */ 588 if (new_prog) { 589 /* Classic BPF expects A and X to be reset first. These need 590 * to be guaranteed to be the first two instructions. 591 */ 592 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 593 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_X, BPF_REG_X); 594 595 /* All programs must keep CTX in callee saved BPF_REG_CTX. 596 * In eBPF case it's done by the compiler, here we need to 597 * do this ourself. Initial CTX is present in BPF_REG_ARG1. 598 */ 599 *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1); 600 if (*seen_ld_abs) { 601 /* For packet access in classic BPF, cache skb->data 602 * in callee-saved BPF R8 and skb->len - skb->data_len 603 * (headlen) in BPF R9. Since classic BPF is read-only 604 * on CTX, we only need to cache it once. 605 */ 606 *new_insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 607 BPF_REG_D, BPF_REG_CTX, 608 offsetof(struct sk_buff, data)); 609 *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_H, BPF_REG_CTX, 610 offsetof(struct sk_buff, len)); 611 *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_TMP, BPF_REG_CTX, 612 offsetof(struct sk_buff, data_len)); 613 *new_insn++ = BPF_ALU32_REG(BPF_SUB, BPF_REG_H, BPF_REG_TMP); 614 } 615 } else { 616 new_insn += 3; 617 } 618 619 for (i = 0; i < len; fp++, i++) { 620 struct bpf_insn tmp_insns[32] = { }; 621 struct bpf_insn *insn = tmp_insns; 622 623 if (addrs) 624 addrs[i] = new_insn - first_insn; 625 626 switch (fp->code) { 627 /* All arithmetic insns and skb loads map as-is. */ 628 case BPF_ALU | BPF_ADD | BPF_X: 629 case BPF_ALU | BPF_ADD | BPF_K: 630 case BPF_ALU | BPF_SUB | BPF_X: 631 case BPF_ALU | BPF_SUB | BPF_K: 632 case BPF_ALU | BPF_AND | BPF_X: 633 case BPF_ALU | BPF_AND | BPF_K: 634 case BPF_ALU | BPF_OR | BPF_X: 635 case BPF_ALU | BPF_OR | BPF_K: 636 case BPF_ALU | BPF_LSH | BPF_X: 637 case BPF_ALU | BPF_LSH | BPF_K: 638 case BPF_ALU | BPF_RSH | BPF_X: 639 case BPF_ALU | BPF_RSH | BPF_K: 640 case BPF_ALU | BPF_XOR | BPF_X: 641 case BPF_ALU | BPF_XOR | BPF_K: 642 case BPF_ALU | BPF_MUL | BPF_X: 643 case BPF_ALU | BPF_MUL | BPF_K: 644 case BPF_ALU | BPF_DIV | BPF_X: 645 case BPF_ALU | BPF_DIV | BPF_K: 646 case BPF_ALU | BPF_MOD | BPF_X: 647 case BPF_ALU | BPF_MOD | BPF_K: 648 case BPF_ALU | BPF_NEG: 649 case BPF_LD | BPF_ABS | BPF_W: 650 case BPF_LD | BPF_ABS | BPF_H: 651 case BPF_LD | BPF_ABS | BPF_B: 652 case BPF_LD | BPF_IND | BPF_W: 653 case BPF_LD | BPF_IND | BPF_H: 654 case BPF_LD | BPF_IND | BPF_B: 655 /* Check for overloaded BPF extension and 656 * directly convert it if found, otherwise 657 * just move on with mapping. 658 */ 659 if (BPF_CLASS(fp->code) == BPF_LD && 660 BPF_MODE(fp->code) == BPF_ABS && 661 convert_bpf_extensions(fp, &insn)) 662 break; 663 if (BPF_CLASS(fp->code) == BPF_LD && 664 convert_bpf_ld_abs(fp, &insn)) { 665 *seen_ld_abs = true; 666 break; 667 } 668 669 if (fp->code == (BPF_ALU | BPF_DIV | BPF_X) || 670 fp->code == (BPF_ALU | BPF_MOD | BPF_X)) { 671 *insn++ = BPF_MOV32_REG(BPF_REG_X, BPF_REG_X); 672 /* Error with exception code on div/mod by 0. 673 * For cBPF programs, this was always return 0. 674 */ 675 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_X, 0, 2); 676 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 677 *insn++ = BPF_EXIT_INSN(); 678 } 679 680 *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k); 681 break; 682 683 /* Jump transformation cannot use BPF block macros 684 * everywhere as offset calculation and target updates 685 * require a bit more work than the rest, i.e. jump 686 * opcodes map as-is, but offsets need adjustment. 687 */ 688 689 #define BPF_EMIT_JMP \ 690 do { \ 691 const s32 off_min = S16_MIN, off_max = S16_MAX; \ 692 s32 off; \ 693 \ 694 if (target >= len || target < 0) \ 695 goto err; \ 696 off = addrs ? addrs[target] - addrs[i] - 1 : 0; \ 697 /* Adjust pc relative offset for 2nd or 3rd insn. */ \ 698 off -= insn - tmp_insns; \ 699 /* Reject anything not fitting into insn->off. */ \ 700 if (off < off_min || off > off_max) \ 701 goto err; \ 702 insn->off = off; \ 703 } while (0) 704 705 case BPF_JMP | BPF_JA: 706 target = i + fp->k + 1; 707 insn->code = fp->code; 708 BPF_EMIT_JMP; 709 break; 710 711 case BPF_JMP | BPF_JEQ | BPF_K: 712 case BPF_JMP | BPF_JEQ | BPF_X: 713 case BPF_JMP | BPF_JSET | BPF_K: 714 case BPF_JMP | BPF_JSET | BPF_X: 715 case BPF_JMP | BPF_JGT | BPF_K: 716 case BPF_JMP | BPF_JGT | BPF_X: 717 case BPF_JMP | BPF_JGE | BPF_K: 718 case BPF_JMP | BPF_JGE | BPF_X: 719 if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) { 720 /* BPF immediates are signed, zero extend 721 * immediate into tmp register and use it 722 * in compare insn. 723 */ 724 *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k); 725 726 insn->dst_reg = BPF_REG_A; 727 insn->src_reg = BPF_REG_TMP; 728 bpf_src = BPF_X; 729 } else { 730 insn->dst_reg = BPF_REG_A; 731 insn->imm = fp->k; 732 bpf_src = BPF_SRC(fp->code); 733 insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0; 734 } 735 736 /* Common case where 'jump_false' is next insn. */ 737 if (fp->jf == 0) { 738 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; 739 target = i + fp->jt + 1; 740 BPF_EMIT_JMP; 741 break; 742 } 743 744 /* Convert some jumps when 'jump_true' is next insn. */ 745 if (fp->jt == 0) { 746 switch (BPF_OP(fp->code)) { 747 case BPF_JEQ: 748 insn->code = BPF_JMP | BPF_JNE | bpf_src; 749 break; 750 case BPF_JGT: 751 insn->code = BPF_JMP | BPF_JLE | bpf_src; 752 break; 753 case BPF_JGE: 754 insn->code = BPF_JMP | BPF_JLT | bpf_src; 755 break; 756 default: 757 goto jmp_rest; 758 } 759 760 target = i + fp->jf + 1; 761 BPF_EMIT_JMP; 762 break; 763 } 764 jmp_rest: 765 /* Other jumps are mapped into two insns: Jxx and JA. */ 766 target = i + fp->jt + 1; 767 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; 768 BPF_EMIT_JMP; 769 insn++; 770 771 insn->code = BPF_JMP | BPF_JA; 772 target = i + fp->jf + 1; 773 BPF_EMIT_JMP; 774 break; 775 776 /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */ 777 case BPF_LDX | BPF_MSH | BPF_B: { 778 struct sock_filter tmp = { 779 .code = BPF_LD | BPF_ABS | BPF_B, 780 .k = fp->k, 781 }; 782 783 *seen_ld_abs = true; 784 785 /* X = A */ 786 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 787 /* A = BPF_R0 = *(u8 *) (skb->data + K) */ 788 convert_bpf_ld_abs(&tmp, &insn); 789 insn++; 790 /* A &= 0xf */ 791 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf); 792 /* A <<= 2 */ 793 *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2); 794 /* tmp = X */ 795 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_X); 796 /* X = A */ 797 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 798 /* A = tmp */ 799 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP); 800 break; 801 } 802 /* RET_K is remaped into 2 insns. RET_A case doesn't need an 803 * extra mov as BPF_REG_0 is already mapped into BPF_REG_A. 804 */ 805 case BPF_RET | BPF_A: 806 case BPF_RET | BPF_K: 807 if (BPF_RVAL(fp->code) == BPF_K) 808 *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0, 809 0, fp->k); 810 *insn = BPF_EXIT_INSN(); 811 break; 812 813 /* Store to stack. */ 814 case BPF_ST: 815 case BPF_STX: 816 stack_off = fp->k * 4 + 4; 817 *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) == 818 BPF_ST ? BPF_REG_A : BPF_REG_X, 819 -stack_off); 820 /* check_load_and_stores() verifies that classic BPF can 821 * load from stack only after write, so tracking 822 * stack_depth for ST|STX insns is enough 823 */ 824 if (new_prog && new_prog->aux->stack_depth < stack_off) 825 new_prog->aux->stack_depth = stack_off; 826 break; 827 828 /* Load from stack. */ 829 case BPF_LD | BPF_MEM: 830 case BPF_LDX | BPF_MEM: 831 stack_off = fp->k * 4 + 4; 832 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? 833 BPF_REG_A : BPF_REG_X, BPF_REG_FP, 834 -stack_off); 835 break; 836 837 /* A = K or X = K */ 838 case BPF_LD | BPF_IMM: 839 case BPF_LDX | BPF_IMM: 840 *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ? 841 BPF_REG_A : BPF_REG_X, fp->k); 842 break; 843 844 /* X = A */ 845 case BPF_MISC | BPF_TAX: 846 *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 847 break; 848 849 /* A = X */ 850 case BPF_MISC | BPF_TXA: 851 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X); 852 break; 853 854 /* A = skb->len or X = skb->len */ 855 case BPF_LD | BPF_W | BPF_LEN: 856 case BPF_LDX | BPF_W | BPF_LEN: 857 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? 858 BPF_REG_A : BPF_REG_X, BPF_REG_CTX, 859 offsetof(struct sk_buff, len)); 860 break; 861 862 /* Access seccomp_data fields. */ 863 case BPF_LDX | BPF_ABS | BPF_W: 864 /* A = *(u32 *) (ctx + K) */ 865 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k); 866 break; 867 868 /* Unknown instruction. */ 869 default: 870 goto err; 871 } 872 873 insn++; 874 if (new_prog) 875 memcpy(new_insn, tmp_insns, 876 sizeof(*insn) * (insn - tmp_insns)); 877 new_insn += insn - tmp_insns; 878 } 879 880 if (!new_prog) { 881 /* Only calculating new length. */ 882 *new_len = new_insn - first_insn; 883 if (*seen_ld_abs) 884 *new_len += 4; /* Prologue bits. */ 885 return 0; 886 } 887 888 pass++; 889 if (new_flen != new_insn - first_insn) { 890 new_flen = new_insn - first_insn; 891 if (pass > 2) 892 goto err; 893 goto do_pass; 894 } 895 896 kfree(addrs); 897 BUG_ON(*new_len != new_flen); 898 return 0; 899 err: 900 kfree(addrs); 901 return -EINVAL; 902 } 903 904 /* Security: 905 * 906 * As we dont want to clear mem[] array for each packet going through 907 * __bpf_prog_run(), we check that filter loaded by user never try to read 908 * a cell if not previously written, and we check all branches to be sure 909 * a malicious user doesn't try to abuse us. 910 */ 911 static int check_load_and_stores(const struct sock_filter *filter, int flen) 912 { 913 u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */ 914 int pc, ret = 0; 915 916 BUILD_BUG_ON(BPF_MEMWORDS > 16); 917 918 masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL); 919 if (!masks) 920 return -ENOMEM; 921 922 memset(masks, 0xff, flen * sizeof(*masks)); 923 924 for (pc = 0; pc < flen; pc++) { 925 memvalid &= masks[pc]; 926 927 switch (filter[pc].code) { 928 case BPF_ST: 929 case BPF_STX: 930 memvalid |= (1 << filter[pc].k); 931 break; 932 case BPF_LD | BPF_MEM: 933 case BPF_LDX | BPF_MEM: 934 if (!(memvalid & (1 << filter[pc].k))) { 935 ret = -EINVAL; 936 goto error; 937 } 938 break; 939 case BPF_JMP | BPF_JA: 940 /* A jump must set masks on target */ 941 masks[pc + 1 + filter[pc].k] &= memvalid; 942 memvalid = ~0; 943 break; 944 case BPF_JMP | BPF_JEQ | BPF_K: 945 case BPF_JMP | BPF_JEQ | BPF_X: 946 case BPF_JMP | BPF_JGE | BPF_K: 947 case BPF_JMP | BPF_JGE | BPF_X: 948 case BPF_JMP | BPF_JGT | BPF_K: 949 case BPF_JMP | BPF_JGT | BPF_X: 950 case BPF_JMP | BPF_JSET | BPF_K: 951 case BPF_JMP | BPF_JSET | BPF_X: 952 /* A jump must set masks on targets */ 953 masks[pc + 1 + filter[pc].jt] &= memvalid; 954 masks[pc + 1 + filter[pc].jf] &= memvalid; 955 memvalid = ~0; 956 break; 957 } 958 } 959 error: 960 kfree(masks); 961 return ret; 962 } 963 964 static bool chk_code_allowed(u16 code_to_probe) 965 { 966 static const bool codes[] = { 967 /* 32 bit ALU operations */ 968 [BPF_ALU | BPF_ADD | BPF_K] = true, 969 [BPF_ALU | BPF_ADD | BPF_X] = true, 970 [BPF_ALU | BPF_SUB | BPF_K] = true, 971 [BPF_ALU | BPF_SUB | BPF_X] = true, 972 [BPF_ALU | BPF_MUL | BPF_K] = true, 973 [BPF_ALU | BPF_MUL | BPF_X] = true, 974 [BPF_ALU | BPF_DIV | BPF_K] = true, 975 [BPF_ALU | BPF_DIV | BPF_X] = true, 976 [BPF_ALU | BPF_MOD | BPF_K] = true, 977 [BPF_ALU | BPF_MOD | BPF_X] = true, 978 [BPF_ALU | BPF_AND | BPF_K] = true, 979 [BPF_ALU | BPF_AND | BPF_X] = true, 980 [BPF_ALU | BPF_OR | BPF_K] = true, 981 [BPF_ALU | BPF_OR | BPF_X] = true, 982 [BPF_ALU | BPF_XOR | BPF_K] = true, 983 [BPF_ALU | BPF_XOR | BPF_X] = true, 984 [BPF_ALU | BPF_LSH | BPF_K] = true, 985 [BPF_ALU | BPF_LSH | BPF_X] = true, 986 [BPF_ALU | BPF_RSH | BPF_K] = true, 987 [BPF_ALU | BPF_RSH | BPF_X] = true, 988 [BPF_ALU | BPF_NEG] = true, 989 /* Load instructions */ 990 [BPF_LD | BPF_W | BPF_ABS] = true, 991 [BPF_LD | BPF_H | BPF_ABS] = true, 992 [BPF_LD | BPF_B | BPF_ABS] = true, 993 [BPF_LD | BPF_W | BPF_LEN] = true, 994 [BPF_LD | BPF_W | BPF_IND] = true, 995 [BPF_LD | BPF_H | BPF_IND] = true, 996 [BPF_LD | BPF_B | BPF_IND] = true, 997 [BPF_LD | BPF_IMM] = true, 998 [BPF_LD | BPF_MEM] = true, 999 [BPF_LDX | BPF_W | BPF_LEN] = true, 1000 [BPF_LDX | BPF_B | BPF_MSH] = true, 1001 [BPF_LDX | BPF_IMM] = true, 1002 [BPF_LDX | BPF_MEM] = true, 1003 /* Store instructions */ 1004 [BPF_ST] = true, 1005 [BPF_STX] = true, 1006 /* Misc instructions */ 1007 [BPF_MISC | BPF_TAX] = true, 1008 [BPF_MISC | BPF_TXA] = true, 1009 /* Return instructions */ 1010 [BPF_RET | BPF_K] = true, 1011 [BPF_RET | BPF_A] = true, 1012 /* Jump instructions */ 1013 [BPF_JMP | BPF_JA] = true, 1014 [BPF_JMP | BPF_JEQ | BPF_K] = true, 1015 [BPF_JMP | BPF_JEQ | BPF_X] = true, 1016 [BPF_JMP | BPF_JGE | BPF_K] = true, 1017 [BPF_JMP | BPF_JGE | BPF_X] = true, 1018 [BPF_JMP | BPF_JGT | BPF_K] = true, 1019 [BPF_JMP | BPF_JGT | BPF_X] = true, 1020 [BPF_JMP | BPF_JSET | BPF_K] = true, 1021 [BPF_JMP | BPF_JSET | BPF_X] = true, 1022 }; 1023 1024 if (code_to_probe >= ARRAY_SIZE(codes)) 1025 return false; 1026 1027 return codes[code_to_probe]; 1028 } 1029 1030 static bool bpf_check_basics_ok(const struct sock_filter *filter, 1031 unsigned int flen) 1032 { 1033 if (filter == NULL) 1034 return false; 1035 if (flen == 0 || flen > BPF_MAXINSNS) 1036 return false; 1037 1038 return true; 1039 } 1040 1041 /** 1042 * bpf_check_classic - verify socket filter code 1043 * @filter: filter to verify 1044 * @flen: length of filter 1045 * 1046 * Check the user's filter code. If we let some ugly 1047 * filter code slip through kaboom! The filter must contain 1048 * no references or jumps that are out of range, no illegal 1049 * instructions, and must end with a RET instruction. 1050 * 1051 * All jumps are forward as they are not signed. 1052 * 1053 * Returns 0 if the rule set is legal or -EINVAL if not. 1054 */ 1055 static int bpf_check_classic(const struct sock_filter *filter, 1056 unsigned int flen) 1057 { 1058 bool anc_found; 1059 int pc; 1060 1061 /* Check the filter code now */ 1062 for (pc = 0; pc < flen; pc++) { 1063 const struct sock_filter *ftest = &filter[pc]; 1064 1065 /* May we actually operate on this code? */ 1066 if (!chk_code_allowed(ftest->code)) 1067 return -EINVAL; 1068 1069 /* Some instructions need special checks */ 1070 switch (ftest->code) { 1071 case BPF_ALU | BPF_DIV | BPF_K: 1072 case BPF_ALU | BPF_MOD | BPF_K: 1073 /* Check for division by zero */ 1074 if (ftest->k == 0) 1075 return -EINVAL; 1076 break; 1077 case BPF_ALU | BPF_LSH | BPF_K: 1078 case BPF_ALU | BPF_RSH | BPF_K: 1079 if (ftest->k >= 32) 1080 return -EINVAL; 1081 break; 1082 case BPF_LD | BPF_MEM: 1083 case BPF_LDX | BPF_MEM: 1084 case BPF_ST: 1085 case BPF_STX: 1086 /* Check for invalid memory addresses */ 1087 if (ftest->k >= BPF_MEMWORDS) 1088 return -EINVAL; 1089 break; 1090 case BPF_JMP | BPF_JA: 1091 /* Note, the large ftest->k might cause loops. 1092 * Compare this with conditional jumps below, 1093 * where offsets are limited. --ANK (981016) 1094 */ 1095 if (ftest->k >= (unsigned int)(flen - pc - 1)) 1096 return -EINVAL; 1097 break; 1098 case BPF_JMP | BPF_JEQ | BPF_K: 1099 case BPF_JMP | BPF_JEQ | BPF_X: 1100 case BPF_JMP | BPF_JGE | BPF_K: 1101 case BPF_JMP | BPF_JGE | BPF_X: 1102 case BPF_JMP | BPF_JGT | BPF_K: 1103 case BPF_JMP | BPF_JGT | BPF_X: 1104 case BPF_JMP | BPF_JSET | BPF_K: 1105 case BPF_JMP | BPF_JSET | BPF_X: 1106 /* Both conditionals must be safe */ 1107 if (pc + ftest->jt + 1 >= flen || 1108 pc + ftest->jf + 1 >= flen) 1109 return -EINVAL; 1110 break; 1111 case BPF_LD | BPF_W | BPF_ABS: 1112 case BPF_LD | BPF_H | BPF_ABS: 1113 case BPF_LD | BPF_B | BPF_ABS: 1114 anc_found = false; 1115 if (bpf_anc_helper(ftest) & BPF_ANC) 1116 anc_found = true; 1117 /* Ancillary operation unknown or unsupported */ 1118 if (anc_found == false && ftest->k >= SKF_AD_OFF) 1119 return -EINVAL; 1120 } 1121 } 1122 1123 /* Last instruction must be a RET code */ 1124 switch (filter[flen - 1].code) { 1125 case BPF_RET | BPF_K: 1126 case BPF_RET | BPF_A: 1127 return check_load_and_stores(filter, flen); 1128 } 1129 1130 return -EINVAL; 1131 } 1132 1133 static int bpf_prog_store_orig_filter(struct bpf_prog *fp, 1134 const struct sock_fprog *fprog) 1135 { 1136 unsigned int fsize = bpf_classic_proglen(fprog); 1137 struct sock_fprog_kern *fkprog; 1138 1139 fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL); 1140 if (!fp->orig_prog) 1141 return -ENOMEM; 1142 1143 fkprog = fp->orig_prog; 1144 fkprog->len = fprog->len; 1145 1146 fkprog->filter = kmemdup(fp->insns, fsize, 1147 GFP_KERNEL | __GFP_NOWARN); 1148 if (!fkprog->filter) { 1149 kfree(fp->orig_prog); 1150 return -ENOMEM; 1151 } 1152 1153 return 0; 1154 } 1155 1156 static void bpf_release_orig_filter(struct bpf_prog *fp) 1157 { 1158 struct sock_fprog_kern *fprog = fp->orig_prog; 1159 1160 if (fprog) { 1161 kfree(fprog->filter); 1162 kfree(fprog); 1163 } 1164 } 1165 1166 static void __bpf_prog_release(struct bpf_prog *prog) 1167 { 1168 if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) { 1169 bpf_prog_put(prog); 1170 } else { 1171 bpf_release_orig_filter(prog); 1172 bpf_prog_free(prog); 1173 } 1174 } 1175 1176 static void __sk_filter_release(struct sk_filter *fp) 1177 { 1178 __bpf_prog_release(fp->prog); 1179 kfree(fp); 1180 } 1181 1182 /** 1183 * sk_filter_release_rcu - Release a socket filter by rcu_head 1184 * @rcu: rcu_head that contains the sk_filter to free 1185 */ 1186 static void sk_filter_release_rcu(struct rcu_head *rcu) 1187 { 1188 struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu); 1189 1190 __sk_filter_release(fp); 1191 } 1192 1193 /** 1194 * sk_filter_release - release a socket filter 1195 * @fp: filter to remove 1196 * 1197 * Remove a filter from a socket and release its resources. 1198 */ 1199 static void sk_filter_release(struct sk_filter *fp) 1200 { 1201 if (refcount_dec_and_test(&fp->refcnt)) 1202 call_rcu(&fp->rcu, sk_filter_release_rcu); 1203 } 1204 1205 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) 1206 { 1207 u32 filter_size = bpf_prog_size(fp->prog->len); 1208 1209 atomic_sub(filter_size, &sk->sk_omem_alloc); 1210 sk_filter_release(fp); 1211 } 1212 1213 /* try to charge the socket memory if there is space available 1214 * return true on success 1215 */ 1216 static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp) 1217 { 1218 u32 filter_size = bpf_prog_size(fp->prog->len); 1219 int optmem_max = READ_ONCE(sysctl_optmem_max); 1220 1221 /* same check as in sock_kmalloc() */ 1222 if (filter_size <= optmem_max && 1223 atomic_read(&sk->sk_omem_alloc) + filter_size < optmem_max) { 1224 atomic_add(filter_size, &sk->sk_omem_alloc); 1225 return true; 1226 } 1227 return false; 1228 } 1229 1230 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp) 1231 { 1232 if (!refcount_inc_not_zero(&fp->refcnt)) 1233 return false; 1234 1235 if (!__sk_filter_charge(sk, fp)) { 1236 sk_filter_release(fp); 1237 return false; 1238 } 1239 return true; 1240 } 1241 1242 static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp) 1243 { 1244 struct sock_filter *old_prog; 1245 struct bpf_prog *old_fp; 1246 int err, new_len, old_len = fp->len; 1247 bool seen_ld_abs = false; 1248 1249 /* We are free to overwrite insns et al right here as it won't be used at 1250 * this point in time anymore internally after the migration to the eBPF 1251 * instruction representation. 1252 */ 1253 BUILD_BUG_ON(sizeof(struct sock_filter) != 1254 sizeof(struct bpf_insn)); 1255 1256 /* Conversion cannot happen on overlapping memory areas, 1257 * so we need to keep the user BPF around until the 2nd 1258 * pass. At this time, the user BPF is stored in fp->insns. 1259 */ 1260 old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter), 1261 GFP_KERNEL | __GFP_NOWARN); 1262 if (!old_prog) { 1263 err = -ENOMEM; 1264 goto out_err; 1265 } 1266 1267 /* 1st pass: calculate the new program length. */ 1268 err = bpf_convert_filter(old_prog, old_len, NULL, &new_len, 1269 &seen_ld_abs); 1270 if (err) 1271 goto out_err_free; 1272 1273 /* Expand fp for appending the new filter representation. */ 1274 old_fp = fp; 1275 fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0); 1276 if (!fp) { 1277 /* The old_fp is still around in case we couldn't 1278 * allocate new memory, so uncharge on that one. 1279 */ 1280 fp = old_fp; 1281 err = -ENOMEM; 1282 goto out_err_free; 1283 } 1284 1285 fp->len = new_len; 1286 1287 /* 2nd pass: remap sock_filter insns into bpf_insn insns. */ 1288 err = bpf_convert_filter(old_prog, old_len, fp, &new_len, 1289 &seen_ld_abs); 1290 if (err) 1291 /* 2nd bpf_convert_filter() can fail only if it fails 1292 * to allocate memory, remapping must succeed. Note, 1293 * that at this time old_fp has already been released 1294 * by krealloc(). 1295 */ 1296 goto out_err_free; 1297 1298 fp = bpf_prog_select_runtime(fp, &err); 1299 if (err) 1300 goto out_err_free; 1301 1302 kfree(old_prog); 1303 return fp; 1304 1305 out_err_free: 1306 kfree(old_prog); 1307 out_err: 1308 __bpf_prog_release(fp); 1309 return ERR_PTR(err); 1310 } 1311 1312 static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp, 1313 bpf_aux_classic_check_t trans) 1314 { 1315 int err; 1316 1317 fp->bpf_func = NULL; 1318 fp->jited = 0; 1319 1320 err = bpf_check_classic(fp->insns, fp->len); 1321 if (err) { 1322 __bpf_prog_release(fp); 1323 return ERR_PTR(err); 1324 } 1325 1326 /* There might be additional checks and transformations 1327 * needed on classic filters, f.e. in case of seccomp. 1328 */ 1329 if (trans) { 1330 err = trans(fp->insns, fp->len); 1331 if (err) { 1332 __bpf_prog_release(fp); 1333 return ERR_PTR(err); 1334 } 1335 } 1336 1337 /* Probe if we can JIT compile the filter and if so, do 1338 * the compilation of the filter. 1339 */ 1340 bpf_jit_compile(fp); 1341 1342 /* JIT compiler couldn't process this filter, so do the eBPF translation 1343 * for the optimized interpreter. 1344 */ 1345 if (!fp->jited) 1346 fp = bpf_migrate_filter(fp); 1347 1348 return fp; 1349 } 1350 1351 /** 1352 * bpf_prog_create - create an unattached filter 1353 * @pfp: the unattached filter that is created 1354 * @fprog: the filter program 1355 * 1356 * Create a filter independent of any socket. We first run some 1357 * sanity checks on it to make sure it does not explode on us later. 1358 * If an error occurs or there is insufficient memory for the filter 1359 * a negative errno code is returned. On success the return is zero. 1360 */ 1361 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog) 1362 { 1363 unsigned int fsize = bpf_classic_proglen(fprog); 1364 struct bpf_prog *fp; 1365 1366 /* Make sure new filter is there and in the right amounts. */ 1367 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1368 return -EINVAL; 1369 1370 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1371 if (!fp) 1372 return -ENOMEM; 1373 1374 memcpy(fp->insns, fprog->filter, fsize); 1375 1376 fp->len = fprog->len; 1377 /* Since unattached filters are not copied back to user 1378 * space through sk_get_filter(), we do not need to hold 1379 * a copy here, and can spare us the work. 1380 */ 1381 fp->orig_prog = NULL; 1382 1383 /* bpf_prepare_filter() already takes care of freeing 1384 * memory in case something goes wrong. 1385 */ 1386 fp = bpf_prepare_filter(fp, NULL); 1387 if (IS_ERR(fp)) 1388 return PTR_ERR(fp); 1389 1390 *pfp = fp; 1391 return 0; 1392 } 1393 EXPORT_SYMBOL_GPL(bpf_prog_create); 1394 1395 /** 1396 * bpf_prog_create_from_user - create an unattached filter from user buffer 1397 * @pfp: the unattached filter that is created 1398 * @fprog: the filter program 1399 * @trans: post-classic verifier transformation handler 1400 * @save_orig: save classic BPF program 1401 * 1402 * This function effectively does the same as bpf_prog_create(), only 1403 * that it builds up its insns buffer from user space provided buffer. 1404 * It also allows for passing a bpf_aux_classic_check_t handler. 1405 */ 1406 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, 1407 bpf_aux_classic_check_t trans, bool save_orig) 1408 { 1409 unsigned int fsize = bpf_classic_proglen(fprog); 1410 struct bpf_prog *fp; 1411 int err; 1412 1413 /* Make sure new filter is there and in the right amounts. */ 1414 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1415 return -EINVAL; 1416 1417 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1418 if (!fp) 1419 return -ENOMEM; 1420 1421 if (copy_from_user(fp->insns, fprog->filter, fsize)) { 1422 __bpf_prog_free(fp); 1423 return -EFAULT; 1424 } 1425 1426 fp->len = fprog->len; 1427 fp->orig_prog = NULL; 1428 1429 if (save_orig) { 1430 err = bpf_prog_store_orig_filter(fp, fprog); 1431 if (err) { 1432 __bpf_prog_free(fp); 1433 return -ENOMEM; 1434 } 1435 } 1436 1437 /* bpf_prepare_filter() already takes care of freeing 1438 * memory in case something goes wrong. 1439 */ 1440 fp = bpf_prepare_filter(fp, trans); 1441 if (IS_ERR(fp)) 1442 return PTR_ERR(fp); 1443 1444 *pfp = fp; 1445 return 0; 1446 } 1447 EXPORT_SYMBOL_GPL(bpf_prog_create_from_user); 1448 1449 void bpf_prog_destroy(struct bpf_prog *fp) 1450 { 1451 __bpf_prog_release(fp); 1452 } 1453 EXPORT_SYMBOL_GPL(bpf_prog_destroy); 1454 1455 static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk) 1456 { 1457 struct sk_filter *fp, *old_fp; 1458 1459 fp = kmalloc(sizeof(*fp), GFP_KERNEL); 1460 if (!fp) 1461 return -ENOMEM; 1462 1463 fp->prog = prog; 1464 1465 if (!__sk_filter_charge(sk, fp)) { 1466 kfree(fp); 1467 return -ENOMEM; 1468 } 1469 refcount_set(&fp->refcnt, 1); 1470 1471 old_fp = rcu_dereference_protected(sk->sk_filter, 1472 lockdep_sock_is_held(sk)); 1473 rcu_assign_pointer(sk->sk_filter, fp); 1474 1475 if (old_fp) 1476 sk_filter_uncharge(sk, old_fp); 1477 1478 return 0; 1479 } 1480 1481 static 1482 struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk) 1483 { 1484 unsigned int fsize = bpf_classic_proglen(fprog); 1485 struct bpf_prog *prog; 1486 int err; 1487 1488 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1489 return ERR_PTR(-EPERM); 1490 1491 /* Make sure new filter is there and in the right amounts. */ 1492 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1493 return ERR_PTR(-EINVAL); 1494 1495 prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1496 if (!prog) 1497 return ERR_PTR(-ENOMEM); 1498 1499 if (copy_from_user(prog->insns, fprog->filter, fsize)) { 1500 __bpf_prog_free(prog); 1501 return ERR_PTR(-EFAULT); 1502 } 1503 1504 prog->len = fprog->len; 1505 1506 err = bpf_prog_store_orig_filter(prog, fprog); 1507 if (err) { 1508 __bpf_prog_free(prog); 1509 return ERR_PTR(-ENOMEM); 1510 } 1511 1512 /* bpf_prepare_filter() already takes care of freeing 1513 * memory in case something goes wrong. 1514 */ 1515 return bpf_prepare_filter(prog, NULL); 1516 } 1517 1518 /** 1519 * sk_attach_filter - attach a socket filter 1520 * @fprog: the filter program 1521 * @sk: the socket to use 1522 * 1523 * Attach the user's filter code. We first run some sanity checks on 1524 * it to make sure it does not explode on us later. If an error 1525 * occurs or there is insufficient memory for the filter a negative 1526 * errno code is returned. On success the return is zero. 1527 */ 1528 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk) 1529 { 1530 struct bpf_prog *prog = __get_filter(fprog, sk); 1531 int err; 1532 1533 if (IS_ERR(prog)) 1534 return PTR_ERR(prog); 1535 1536 err = __sk_attach_prog(prog, sk); 1537 if (err < 0) { 1538 __bpf_prog_release(prog); 1539 return err; 1540 } 1541 1542 return 0; 1543 } 1544 EXPORT_SYMBOL_GPL(sk_attach_filter); 1545 1546 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk) 1547 { 1548 struct bpf_prog *prog = __get_filter(fprog, sk); 1549 int err; 1550 1551 if (IS_ERR(prog)) 1552 return PTR_ERR(prog); 1553 1554 if (bpf_prog_size(prog->len) > READ_ONCE(sysctl_optmem_max)) 1555 err = -ENOMEM; 1556 else 1557 err = reuseport_attach_prog(sk, prog); 1558 1559 if (err) 1560 __bpf_prog_release(prog); 1561 1562 return err; 1563 } 1564 1565 static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk) 1566 { 1567 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1568 return ERR_PTR(-EPERM); 1569 1570 return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); 1571 } 1572 1573 int sk_attach_bpf(u32 ufd, struct sock *sk) 1574 { 1575 struct bpf_prog *prog = __get_bpf(ufd, sk); 1576 int err; 1577 1578 if (IS_ERR(prog)) 1579 return PTR_ERR(prog); 1580 1581 err = __sk_attach_prog(prog, sk); 1582 if (err < 0) { 1583 bpf_prog_put(prog); 1584 return err; 1585 } 1586 1587 return 0; 1588 } 1589 1590 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk) 1591 { 1592 struct bpf_prog *prog; 1593 int err; 1594 1595 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1596 return -EPERM; 1597 1598 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); 1599 if (PTR_ERR(prog) == -EINVAL) 1600 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SK_REUSEPORT); 1601 if (IS_ERR(prog)) 1602 return PTR_ERR(prog); 1603 1604 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) { 1605 /* Like other non BPF_PROG_TYPE_SOCKET_FILTER 1606 * bpf prog (e.g. sockmap). It depends on the 1607 * limitation imposed by bpf_prog_load(). 1608 * Hence, sysctl_optmem_max is not checked. 1609 */ 1610 if ((sk->sk_type != SOCK_STREAM && 1611 sk->sk_type != SOCK_DGRAM) || 1612 (sk->sk_protocol != IPPROTO_UDP && 1613 sk->sk_protocol != IPPROTO_TCP) || 1614 (sk->sk_family != AF_INET && 1615 sk->sk_family != AF_INET6)) { 1616 err = -ENOTSUPP; 1617 goto err_prog_put; 1618 } 1619 } else { 1620 /* BPF_PROG_TYPE_SOCKET_FILTER */ 1621 if (bpf_prog_size(prog->len) > READ_ONCE(sysctl_optmem_max)) { 1622 err = -ENOMEM; 1623 goto err_prog_put; 1624 } 1625 } 1626 1627 err = reuseport_attach_prog(sk, prog); 1628 err_prog_put: 1629 if (err) 1630 bpf_prog_put(prog); 1631 1632 return err; 1633 } 1634 1635 void sk_reuseport_prog_free(struct bpf_prog *prog) 1636 { 1637 if (!prog) 1638 return; 1639 1640 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) 1641 bpf_prog_put(prog); 1642 else 1643 bpf_prog_destroy(prog); 1644 } 1645 1646 struct bpf_scratchpad { 1647 union { 1648 __be32 diff[MAX_BPF_STACK / sizeof(__be32)]; 1649 u8 buff[MAX_BPF_STACK]; 1650 }; 1651 }; 1652 1653 static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp); 1654 1655 static inline int __bpf_try_make_writable(struct sk_buff *skb, 1656 unsigned int write_len) 1657 { 1658 return skb_ensure_writable(skb, write_len); 1659 } 1660 1661 static inline int bpf_try_make_writable(struct sk_buff *skb, 1662 unsigned int write_len) 1663 { 1664 int err = __bpf_try_make_writable(skb, write_len); 1665 1666 bpf_compute_data_pointers(skb); 1667 return err; 1668 } 1669 1670 static int bpf_try_make_head_writable(struct sk_buff *skb) 1671 { 1672 return bpf_try_make_writable(skb, skb_headlen(skb)); 1673 } 1674 1675 static inline void bpf_push_mac_rcsum(struct sk_buff *skb) 1676 { 1677 if (skb_at_tc_ingress(skb)) 1678 skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len); 1679 } 1680 1681 static inline void bpf_pull_mac_rcsum(struct sk_buff *skb) 1682 { 1683 if (skb_at_tc_ingress(skb)) 1684 skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len); 1685 } 1686 1687 BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset, 1688 const void *, from, u32, len, u64, flags) 1689 { 1690 void *ptr; 1691 1692 if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH))) 1693 return -EINVAL; 1694 if (unlikely(offset > INT_MAX)) 1695 return -EFAULT; 1696 if (unlikely(bpf_try_make_writable(skb, offset + len))) 1697 return -EFAULT; 1698 1699 ptr = skb->data + offset; 1700 if (flags & BPF_F_RECOMPUTE_CSUM) 1701 __skb_postpull_rcsum(skb, ptr, len, offset); 1702 1703 memcpy(ptr, from, len); 1704 1705 if (flags & BPF_F_RECOMPUTE_CSUM) 1706 __skb_postpush_rcsum(skb, ptr, len, offset); 1707 if (flags & BPF_F_INVALIDATE_HASH) 1708 skb_clear_hash(skb); 1709 1710 return 0; 1711 } 1712 1713 static const struct bpf_func_proto bpf_skb_store_bytes_proto = { 1714 .func = bpf_skb_store_bytes, 1715 .gpl_only = false, 1716 .ret_type = RET_INTEGER, 1717 .arg1_type = ARG_PTR_TO_CTX, 1718 .arg2_type = ARG_ANYTHING, 1719 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 1720 .arg4_type = ARG_CONST_SIZE, 1721 .arg5_type = ARG_ANYTHING, 1722 }; 1723 1724 int __bpf_skb_store_bytes(struct sk_buff *skb, u32 offset, const void *from, 1725 u32 len, u64 flags) 1726 { 1727 return ____bpf_skb_store_bytes(skb, offset, from, len, flags); 1728 } 1729 1730 BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset, 1731 void *, to, u32, len) 1732 { 1733 void *ptr; 1734 1735 if (unlikely(offset > INT_MAX)) 1736 goto err_clear; 1737 1738 ptr = skb_header_pointer(skb, offset, len, to); 1739 if (unlikely(!ptr)) 1740 goto err_clear; 1741 if (ptr != to) 1742 memcpy(to, ptr, len); 1743 1744 return 0; 1745 err_clear: 1746 memset(to, 0, len); 1747 return -EFAULT; 1748 } 1749 1750 static const struct bpf_func_proto bpf_skb_load_bytes_proto = { 1751 .func = bpf_skb_load_bytes, 1752 .gpl_only = false, 1753 .ret_type = RET_INTEGER, 1754 .arg1_type = ARG_PTR_TO_CTX, 1755 .arg2_type = ARG_ANYTHING, 1756 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1757 .arg4_type = ARG_CONST_SIZE, 1758 }; 1759 1760 int __bpf_skb_load_bytes(const struct sk_buff *skb, u32 offset, void *to, u32 len) 1761 { 1762 return ____bpf_skb_load_bytes(skb, offset, to, len); 1763 } 1764 1765 BPF_CALL_4(bpf_flow_dissector_load_bytes, 1766 const struct bpf_flow_dissector *, ctx, u32, offset, 1767 void *, to, u32, len) 1768 { 1769 void *ptr; 1770 1771 if (unlikely(offset > 0xffff)) 1772 goto err_clear; 1773 1774 if (unlikely(!ctx->skb)) 1775 goto err_clear; 1776 1777 ptr = skb_header_pointer(ctx->skb, offset, len, to); 1778 if (unlikely(!ptr)) 1779 goto err_clear; 1780 if (ptr != to) 1781 memcpy(to, ptr, len); 1782 1783 return 0; 1784 err_clear: 1785 memset(to, 0, len); 1786 return -EFAULT; 1787 } 1788 1789 static const struct bpf_func_proto bpf_flow_dissector_load_bytes_proto = { 1790 .func = bpf_flow_dissector_load_bytes, 1791 .gpl_only = false, 1792 .ret_type = RET_INTEGER, 1793 .arg1_type = ARG_PTR_TO_CTX, 1794 .arg2_type = ARG_ANYTHING, 1795 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1796 .arg4_type = ARG_CONST_SIZE, 1797 }; 1798 1799 BPF_CALL_5(bpf_skb_load_bytes_relative, const struct sk_buff *, skb, 1800 u32, offset, void *, to, u32, len, u32, start_header) 1801 { 1802 u8 *end = skb_tail_pointer(skb); 1803 u8 *start, *ptr; 1804 1805 if (unlikely(offset > 0xffff)) 1806 goto err_clear; 1807 1808 switch (start_header) { 1809 case BPF_HDR_START_MAC: 1810 if (unlikely(!skb_mac_header_was_set(skb))) 1811 goto err_clear; 1812 start = skb_mac_header(skb); 1813 break; 1814 case BPF_HDR_START_NET: 1815 start = skb_network_header(skb); 1816 break; 1817 default: 1818 goto err_clear; 1819 } 1820 1821 ptr = start + offset; 1822 1823 if (likely(ptr + len <= end)) { 1824 memcpy(to, ptr, len); 1825 return 0; 1826 } 1827 1828 err_clear: 1829 memset(to, 0, len); 1830 return -EFAULT; 1831 } 1832 1833 static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto = { 1834 .func = bpf_skb_load_bytes_relative, 1835 .gpl_only = false, 1836 .ret_type = RET_INTEGER, 1837 .arg1_type = ARG_PTR_TO_CTX, 1838 .arg2_type = ARG_ANYTHING, 1839 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1840 .arg4_type = ARG_CONST_SIZE, 1841 .arg5_type = ARG_ANYTHING, 1842 }; 1843 1844 BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len) 1845 { 1846 /* Idea is the following: should the needed direct read/write 1847 * test fail during runtime, we can pull in more data and redo 1848 * again, since implicitly, we invalidate previous checks here. 1849 * 1850 * Or, since we know how much we need to make read/writeable, 1851 * this can be done once at the program beginning for direct 1852 * access case. By this we overcome limitations of only current 1853 * headroom being accessible. 1854 */ 1855 return bpf_try_make_writable(skb, len ? : skb_headlen(skb)); 1856 } 1857 1858 static const struct bpf_func_proto bpf_skb_pull_data_proto = { 1859 .func = bpf_skb_pull_data, 1860 .gpl_only = false, 1861 .ret_type = RET_INTEGER, 1862 .arg1_type = ARG_PTR_TO_CTX, 1863 .arg2_type = ARG_ANYTHING, 1864 }; 1865 1866 BPF_CALL_1(bpf_sk_fullsock, struct sock *, sk) 1867 { 1868 return sk_fullsock(sk) ? (unsigned long)sk : (unsigned long)NULL; 1869 } 1870 1871 static const struct bpf_func_proto bpf_sk_fullsock_proto = { 1872 .func = bpf_sk_fullsock, 1873 .gpl_only = false, 1874 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 1875 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 1876 }; 1877 1878 static inline int sk_skb_try_make_writable(struct sk_buff *skb, 1879 unsigned int write_len) 1880 { 1881 return __bpf_try_make_writable(skb, write_len); 1882 } 1883 1884 BPF_CALL_2(sk_skb_pull_data, struct sk_buff *, skb, u32, len) 1885 { 1886 /* Idea is the following: should the needed direct read/write 1887 * test fail during runtime, we can pull in more data and redo 1888 * again, since implicitly, we invalidate previous checks here. 1889 * 1890 * Or, since we know how much we need to make read/writeable, 1891 * this can be done once at the program beginning for direct 1892 * access case. By this we overcome limitations of only current 1893 * headroom being accessible. 1894 */ 1895 return sk_skb_try_make_writable(skb, len ? : skb_headlen(skb)); 1896 } 1897 1898 static const struct bpf_func_proto sk_skb_pull_data_proto = { 1899 .func = sk_skb_pull_data, 1900 .gpl_only = false, 1901 .ret_type = RET_INTEGER, 1902 .arg1_type = ARG_PTR_TO_CTX, 1903 .arg2_type = ARG_ANYTHING, 1904 }; 1905 1906 BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset, 1907 u64, from, u64, to, u64, flags) 1908 { 1909 __sum16 *ptr; 1910 1911 if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK))) 1912 return -EINVAL; 1913 if (unlikely(offset > 0xffff || offset & 1)) 1914 return -EFAULT; 1915 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) 1916 return -EFAULT; 1917 1918 ptr = (__sum16 *)(skb->data + offset); 1919 switch (flags & BPF_F_HDR_FIELD_MASK) { 1920 case 0: 1921 if (unlikely(from != 0)) 1922 return -EINVAL; 1923 1924 csum_replace_by_diff(ptr, to); 1925 break; 1926 case 2: 1927 csum_replace2(ptr, from, to); 1928 break; 1929 case 4: 1930 csum_replace4(ptr, from, to); 1931 break; 1932 default: 1933 return -EINVAL; 1934 } 1935 1936 return 0; 1937 } 1938 1939 static const struct bpf_func_proto bpf_l3_csum_replace_proto = { 1940 .func = bpf_l3_csum_replace, 1941 .gpl_only = false, 1942 .ret_type = RET_INTEGER, 1943 .arg1_type = ARG_PTR_TO_CTX, 1944 .arg2_type = ARG_ANYTHING, 1945 .arg3_type = ARG_ANYTHING, 1946 .arg4_type = ARG_ANYTHING, 1947 .arg5_type = ARG_ANYTHING, 1948 }; 1949 1950 BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset, 1951 u64, from, u64, to, u64, flags) 1952 { 1953 bool is_pseudo = flags & BPF_F_PSEUDO_HDR; 1954 bool is_mmzero = flags & BPF_F_MARK_MANGLED_0; 1955 bool do_mforce = flags & BPF_F_MARK_ENFORCE; 1956 __sum16 *ptr; 1957 1958 if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE | 1959 BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK))) 1960 return -EINVAL; 1961 if (unlikely(offset > 0xffff || offset & 1)) 1962 return -EFAULT; 1963 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) 1964 return -EFAULT; 1965 1966 ptr = (__sum16 *)(skb->data + offset); 1967 if (is_mmzero && !do_mforce && !*ptr) 1968 return 0; 1969 1970 switch (flags & BPF_F_HDR_FIELD_MASK) { 1971 case 0: 1972 if (unlikely(from != 0)) 1973 return -EINVAL; 1974 1975 inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo); 1976 break; 1977 case 2: 1978 inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo); 1979 break; 1980 case 4: 1981 inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo); 1982 break; 1983 default: 1984 return -EINVAL; 1985 } 1986 1987 if (is_mmzero && !*ptr) 1988 *ptr = CSUM_MANGLED_0; 1989 return 0; 1990 } 1991 1992 static const struct bpf_func_proto bpf_l4_csum_replace_proto = { 1993 .func = bpf_l4_csum_replace, 1994 .gpl_only = false, 1995 .ret_type = RET_INTEGER, 1996 .arg1_type = ARG_PTR_TO_CTX, 1997 .arg2_type = ARG_ANYTHING, 1998 .arg3_type = ARG_ANYTHING, 1999 .arg4_type = ARG_ANYTHING, 2000 .arg5_type = ARG_ANYTHING, 2001 }; 2002 2003 BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size, 2004 __be32 *, to, u32, to_size, __wsum, seed) 2005 { 2006 struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp); 2007 u32 diff_size = from_size + to_size; 2008 int i, j = 0; 2009 2010 /* This is quite flexible, some examples: 2011 * 2012 * from_size == 0, to_size > 0, seed := csum --> pushing data 2013 * from_size > 0, to_size == 0, seed := csum --> pulling data 2014 * from_size > 0, to_size > 0, seed := 0 --> diffing data 2015 * 2016 * Even for diffing, from_size and to_size don't need to be equal. 2017 */ 2018 if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) || 2019 diff_size > sizeof(sp->diff))) 2020 return -EINVAL; 2021 2022 for (i = 0; i < from_size / sizeof(__be32); i++, j++) 2023 sp->diff[j] = ~from[i]; 2024 for (i = 0; i < to_size / sizeof(__be32); i++, j++) 2025 sp->diff[j] = to[i]; 2026 2027 return csum_partial(sp->diff, diff_size, seed); 2028 } 2029 2030 static const struct bpf_func_proto bpf_csum_diff_proto = { 2031 .func = bpf_csum_diff, 2032 .gpl_only = false, 2033 .pkt_access = true, 2034 .ret_type = RET_INTEGER, 2035 .arg1_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY, 2036 .arg2_type = ARG_CONST_SIZE_OR_ZERO, 2037 .arg3_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY, 2038 .arg4_type = ARG_CONST_SIZE_OR_ZERO, 2039 .arg5_type = ARG_ANYTHING, 2040 }; 2041 2042 BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum) 2043 { 2044 /* The interface is to be used in combination with bpf_csum_diff() 2045 * for direct packet writes. csum rotation for alignment as well 2046 * as emulating csum_sub() can be done from the eBPF program. 2047 */ 2048 if (skb->ip_summed == CHECKSUM_COMPLETE) 2049 return (skb->csum = csum_add(skb->csum, csum)); 2050 2051 return -ENOTSUPP; 2052 } 2053 2054 static const struct bpf_func_proto bpf_csum_update_proto = { 2055 .func = bpf_csum_update, 2056 .gpl_only = false, 2057 .ret_type = RET_INTEGER, 2058 .arg1_type = ARG_PTR_TO_CTX, 2059 .arg2_type = ARG_ANYTHING, 2060 }; 2061 2062 BPF_CALL_2(bpf_csum_level, struct sk_buff *, skb, u64, level) 2063 { 2064 /* The interface is to be used in combination with bpf_skb_adjust_room() 2065 * for encap/decap of packet headers when BPF_F_ADJ_ROOM_NO_CSUM_RESET 2066 * is passed as flags, for example. 2067 */ 2068 switch (level) { 2069 case BPF_CSUM_LEVEL_INC: 2070 __skb_incr_checksum_unnecessary(skb); 2071 break; 2072 case BPF_CSUM_LEVEL_DEC: 2073 __skb_decr_checksum_unnecessary(skb); 2074 break; 2075 case BPF_CSUM_LEVEL_RESET: 2076 __skb_reset_checksum_unnecessary(skb); 2077 break; 2078 case BPF_CSUM_LEVEL_QUERY: 2079 return skb->ip_summed == CHECKSUM_UNNECESSARY ? 2080 skb->csum_level : -EACCES; 2081 default: 2082 return -EINVAL; 2083 } 2084 2085 return 0; 2086 } 2087 2088 static const struct bpf_func_proto bpf_csum_level_proto = { 2089 .func = bpf_csum_level, 2090 .gpl_only = false, 2091 .ret_type = RET_INTEGER, 2092 .arg1_type = ARG_PTR_TO_CTX, 2093 .arg2_type = ARG_ANYTHING, 2094 }; 2095 2096 static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb) 2097 { 2098 return dev_forward_skb_nomtu(dev, skb); 2099 } 2100 2101 static inline int __bpf_rx_skb_no_mac(struct net_device *dev, 2102 struct sk_buff *skb) 2103 { 2104 int ret = ____dev_forward_skb(dev, skb, false); 2105 2106 if (likely(!ret)) { 2107 skb->dev = dev; 2108 ret = netif_rx(skb); 2109 } 2110 2111 return ret; 2112 } 2113 2114 static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb) 2115 { 2116 int ret; 2117 2118 if (dev_xmit_recursion()) { 2119 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); 2120 kfree_skb(skb); 2121 return -ENETDOWN; 2122 } 2123 2124 skb->dev = dev; 2125 skb_set_redirected_noclear(skb, skb_at_tc_ingress(skb)); 2126 skb_clear_tstamp(skb); 2127 2128 dev_xmit_recursion_inc(); 2129 ret = dev_queue_xmit(skb); 2130 dev_xmit_recursion_dec(); 2131 2132 return ret; 2133 } 2134 2135 static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev, 2136 u32 flags) 2137 { 2138 unsigned int mlen = skb_network_offset(skb); 2139 2140 if (unlikely(skb->len <= mlen)) { 2141 kfree_skb(skb); 2142 return -ERANGE; 2143 } 2144 2145 if (mlen) { 2146 __skb_pull(skb, mlen); 2147 2148 /* At ingress, the mac header has already been pulled once. 2149 * At egress, skb_pospull_rcsum has to be done in case that 2150 * the skb is originated from ingress (i.e. a forwarded skb) 2151 * to ensure that rcsum starts at net header. 2152 */ 2153 if (!skb_at_tc_ingress(skb)) 2154 skb_postpull_rcsum(skb, skb_mac_header(skb), mlen); 2155 } 2156 skb_pop_mac_header(skb); 2157 skb_reset_mac_len(skb); 2158 return flags & BPF_F_INGRESS ? 2159 __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb); 2160 } 2161 2162 static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev, 2163 u32 flags) 2164 { 2165 /* Verify that a link layer header is carried */ 2166 if (unlikely(skb->mac_header >= skb->network_header || skb->len == 0)) { 2167 kfree_skb(skb); 2168 return -ERANGE; 2169 } 2170 2171 bpf_push_mac_rcsum(skb); 2172 return flags & BPF_F_INGRESS ? 2173 __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb); 2174 } 2175 2176 static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev, 2177 u32 flags) 2178 { 2179 if (dev_is_mac_header_xmit(dev)) 2180 return __bpf_redirect_common(skb, dev, flags); 2181 else 2182 return __bpf_redirect_no_mac(skb, dev, flags); 2183 } 2184 2185 #if IS_ENABLED(CONFIG_IPV6) 2186 static int bpf_out_neigh_v6(struct net *net, struct sk_buff *skb, 2187 struct net_device *dev, struct bpf_nh_params *nh) 2188 { 2189 u32 hh_len = LL_RESERVED_SPACE(dev); 2190 const struct in6_addr *nexthop; 2191 struct dst_entry *dst = NULL; 2192 struct neighbour *neigh; 2193 2194 if (dev_xmit_recursion()) { 2195 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); 2196 goto out_drop; 2197 } 2198 2199 skb->dev = dev; 2200 skb_clear_tstamp(skb); 2201 2202 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { 2203 skb = skb_expand_head(skb, hh_len); 2204 if (!skb) 2205 return -ENOMEM; 2206 } 2207 2208 rcu_read_lock(); 2209 if (!nh) { 2210 dst = skb_dst(skb); 2211 nexthop = rt6_nexthop(container_of(dst, struct rt6_info, dst), 2212 &ipv6_hdr(skb)->daddr); 2213 } else { 2214 nexthop = &nh->ipv6_nh; 2215 } 2216 neigh = ip_neigh_gw6(dev, nexthop); 2217 if (likely(!IS_ERR(neigh))) { 2218 int ret; 2219 2220 sock_confirm_neigh(skb, neigh); 2221 local_bh_disable(); 2222 dev_xmit_recursion_inc(); 2223 ret = neigh_output(neigh, skb, false); 2224 dev_xmit_recursion_dec(); 2225 local_bh_enable(); 2226 rcu_read_unlock(); 2227 return ret; 2228 } 2229 rcu_read_unlock_bh(); 2230 if (dst) 2231 IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); 2232 out_drop: 2233 kfree_skb(skb); 2234 return -ENETDOWN; 2235 } 2236 2237 static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev, 2238 struct bpf_nh_params *nh) 2239 { 2240 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 2241 struct net *net = dev_net(dev); 2242 int err, ret = NET_XMIT_DROP; 2243 2244 if (!nh) { 2245 struct dst_entry *dst; 2246 struct flowi6 fl6 = { 2247 .flowi6_flags = FLOWI_FLAG_ANYSRC, 2248 .flowi6_mark = skb->mark, 2249 .flowlabel = ip6_flowinfo(ip6h), 2250 .flowi6_oif = dev->ifindex, 2251 .flowi6_proto = ip6h->nexthdr, 2252 .daddr = ip6h->daddr, 2253 .saddr = ip6h->saddr, 2254 }; 2255 2256 dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL); 2257 if (IS_ERR(dst)) 2258 goto out_drop; 2259 2260 skb_dst_set(skb, dst); 2261 } else if (nh->nh_family != AF_INET6) { 2262 goto out_drop; 2263 } 2264 2265 err = bpf_out_neigh_v6(net, skb, dev, nh); 2266 if (unlikely(net_xmit_eval(err))) 2267 dev->stats.tx_errors++; 2268 else 2269 ret = NET_XMIT_SUCCESS; 2270 goto out_xmit; 2271 out_drop: 2272 dev->stats.tx_errors++; 2273 kfree_skb(skb); 2274 out_xmit: 2275 return ret; 2276 } 2277 #else 2278 static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev, 2279 struct bpf_nh_params *nh) 2280 { 2281 kfree_skb(skb); 2282 return NET_XMIT_DROP; 2283 } 2284 #endif /* CONFIG_IPV6 */ 2285 2286 #if IS_ENABLED(CONFIG_INET) 2287 static int bpf_out_neigh_v4(struct net *net, struct sk_buff *skb, 2288 struct net_device *dev, struct bpf_nh_params *nh) 2289 { 2290 u32 hh_len = LL_RESERVED_SPACE(dev); 2291 struct neighbour *neigh; 2292 bool is_v6gw = false; 2293 2294 if (dev_xmit_recursion()) { 2295 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); 2296 goto out_drop; 2297 } 2298 2299 skb->dev = dev; 2300 skb_clear_tstamp(skb); 2301 2302 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { 2303 skb = skb_expand_head(skb, hh_len); 2304 if (!skb) 2305 return -ENOMEM; 2306 } 2307 2308 rcu_read_lock(); 2309 if (!nh) { 2310 struct dst_entry *dst = skb_dst(skb); 2311 struct rtable *rt = container_of(dst, struct rtable, dst); 2312 2313 neigh = ip_neigh_for_gw(rt, skb, &is_v6gw); 2314 } else if (nh->nh_family == AF_INET6) { 2315 neigh = ip_neigh_gw6(dev, &nh->ipv6_nh); 2316 is_v6gw = true; 2317 } else if (nh->nh_family == AF_INET) { 2318 neigh = ip_neigh_gw4(dev, nh->ipv4_nh); 2319 } else { 2320 rcu_read_unlock(); 2321 goto out_drop; 2322 } 2323 2324 if (likely(!IS_ERR(neigh))) { 2325 int ret; 2326 2327 sock_confirm_neigh(skb, neigh); 2328 local_bh_disable(); 2329 dev_xmit_recursion_inc(); 2330 ret = neigh_output(neigh, skb, is_v6gw); 2331 dev_xmit_recursion_dec(); 2332 local_bh_enable(); 2333 rcu_read_unlock(); 2334 return ret; 2335 } 2336 rcu_read_unlock(); 2337 out_drop: 2338 kfree_skb(skb); 2339 return -ENETDOWN; 2340 } 2341 2342 static int __bpf_redirect_neigh_v4(struct sk_buff *skb, struct net_device *dev, 2343 struct bpf_nh_params *nh) 2344 { 2345 const struct iphdr *ip4h = ip_hdr(skb); 2346 struct net *net = dev_net(dev); 2347 int err, ret = NET_XMIT_DROP; 2348 2349 if (!nh) { 2350 struct flowi4 fl4 = { 2351 .flowi4_flags = FLOWI_FLAG_ANYSRC, 2352 .flowi4_mark = skb->mark, 2353 .flowi4_tos = RT_TOS(ip4h->tos), 2354 .flowi4_oif = dev->ifindex, 2355 .flowi4_proto = ip4h->protocol, 2356 .daddr = ip4h->daddr, 2357 .saddr = ip4h->saddr, 2358 }; 2359 struct rtable *rt; 2360 2361 rt = ip_route_output_flow(net, &fl4, NULL); 2362 if (IS_ERR(rt)) 2363 goto out_drop; 2364 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { 2365 ip_rt_put(rt); 2366 goto out_drop; 2367 } 2368 2369 skb_dst_set(skb, &rt->dst); 2370 } 2371 2372 err = bpf_out_neigh_v4(net, skb, dev, nh); 2373 if (unlikely(net_xmit_eval(err))) 2374 dev->stats.tx_errors++; 2375 else 2376 ret = NET_XMIT_SUCCESS; 2377 goto out_xmit; 2378 out_drop: 2379 dev->stats.tx_errors++; 2380 kfree_skb(skb); 2381 out_xmit: 2382 return ret; 2383 } 2384 #else 2385 static int __bpf_redirect_neigh_v4(struct sk_buff *skb, struct net_device *dev, 2386 struct bpf_nh_params *nh) 2387 { 2388 kfree_skb(skb); 2389 return NET_XMIT_DROP; 2390 } 2391 #endif /* CONFIG_INET */ 2392 2393 static int __bpf_redirect_neigh(struct sk_buff *skb, struct net_device *dev, 2394 struct bpf_nh_params *nh) 2395 { 2396 struct ethhdr *ethh = eth_hdr(skb); 2397 2398 if (unlikely(skb->mac_header >= skb->network_header)) 2399 goto out; 2400 bpf_push_mac_rcsum(skb); 2401 if (is_multicast_ether_addr(ethh->h_dest)) 2402 goto out; 2403 2404 skb_pull(skb, sizeof(*ethh)); 2405 skb_unset_mac_header(skb); 2406 skb_reset_network_header(skb); 2407 2408 if (skb->protocol == htons(ETH_P_IP)) 2409 return __bpf_redirect_neigh_v4(skb, dev, nh); 2410 else if (skb->protocol == htons(ETH_P_IPV6)) 2411 return __bpf_redirect_neigh_v6(skb, dev, nh); 2412 out: 2413 kfree_skb(skb); 2414 return -ENOTSUPP; 2415 } 2416 2417 /* Internal, non-exposed redirect flags. */ 2418 enum { 2419 BPF_F_NEIGH = (1ULL << 1), 2420 BPF_F_PEER = (1ULL << 2), 2421 BPF_F_NEXTHOP = (1ULL << 3), 2422 #define BPF_F_REDIRECT_INTERNAL (BPF_F_NEIGH | BPF_F_PEER | BPF_F_NEXTHOP) 2423 }; 2424 2425 BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags) 2426 { 2427 struct net_device *dev; 2428 struct sk_buff *clone; 2429 int ret; 2430 2431 if (unlikely(flags & (~(BPF_F_INGRESS) | BPF_F_REDIRECT_INTERNAL))) 2432 return -EINVAL; 2433 2434 dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex); 2435 if (unlikely(!dev)) 2436 return -EINVAL; 2437 2438 clone = skb_clone(skb, GFP_ATOMIC); 2439 if (unlikely(!clone)) 2440 return -ENOMEM; 2441 2442 /* For direct write, we need to keep the invariant that the skbs 2443 * we're dealing with need to be uncloned. Should uncloning fail 2444 * here, we need to free the just generated clone to unclone once 2445 * again. 2446 */ 2447 ret = bpf_try_make_head_writable(skb); 2448 if (unlikely(ret)) { 2449 kfree_skb(clone); 2450 return -ENOMEM; 2451 } 2452 2453 return __bpf_redirect(clone, dev, flags); 2454 } 2455 2456 static const struct bpf_func_proto bpf_clone_redirect_proto = { 2457 .func = bpf_clone_redirect, 2458 .gpl_only = false, 2459 .ret_type = RET_INTEGER, 2460 .arg1_type = ARG_PTR_TO_CTX, 2461 .arg2_type = ARG_ANYTHING, 2462 .arg3_type = ARG_ANYTHING, 2463 }; 2464 2465 DEFINE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info); 2466 EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info); 2467 2468 int skb_do_redirect(struct sk_buff *skb) 2469 { 2470 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2471 struct net *net = dev_net(skb->dev); 2472 struct net_device *dev; 2473 u32 flags = ri->flags; 2474 2475 dev = dev_get_by_index_rcu(net, ri->tgt_index); 2476 ri->tgt_index = 0; 2477 ri->flags = 0; 2478 if (unlikely(!dev)) 2479 goto out_drop; 2480 if (flags & BPF_F_PEER) { 2481 const struct net_device_ops *ops = dev->netdev_ops; 2482 2483 if (unlikely(!ops->ndo_get_peer_dev || 2484 !skb_at_tc_ingress(skb))) 2485 goto out_drop; 2486 dev = ops->ndo_get_peer_dev(dev); 2487 if (unlikely(!dev || 2488 !(dev->flags & IFF_UP) || 2489 net_eq(net, dev_net(dev)))) 2490 goto out_drop; 2491 skb->dev = dev; 2492 return -EAGAIN; 2493 } 2494 return flags & BPF_F_NEIGH ? 2495 __bpf_redirect_neigh(skb, dev, flags & BPF_F_NEXTHOP ? 2496 &ri->nh : NULL) : 2497 __bpf_redirect(skb, dev, flags); 2498 out_drop: 2499 kfree_skb(skb); 2500 return -EINVAL; 2501 } 2502 2503 BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags) 2504 { 2505 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2506 2507 if (unlikely(flags & (~(BPF_F_INGRESS) | BPF_F_REDIRECT_INTERNAL))) 2508 return TC_ACT_SHOT; 2509 2510 ri->flags = flags; 2511 ri->tgt_index = ifindex; 2512 2513 return TC_ACT_REDIRECT; 2514 } 2515 2516 static const struct bpf_func_proto bpf_redirect_proto = { 2517 .func = bpf_redirect, 2518 .gpl_only = false, 2519 .ret_type = RET_INTEGER, 2520 .arg1_type = ARG_ANYTHING, 2521 .arg2_type = ARG_ANYTHING, 2522 }; 2523 2524 BPF_CALL_2(bpf_redirect_peer, u32, ifindex, u64, flags) 2525 { 2526 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2527 2528 if (unlikely(flags)) 2529 return TC_ACT_SHOT; 2530 2531 ri->flags = BPF_F_PEER; 2532 ri->tgt_index = ifindex; 2533 2534 return TC_ACT_REDIRECT; 2535 } 2536 2537 static const struct bpf_func_proto bpf_redirect_peer_proto = { 2538 .func = bpf_redirect_peer, 2539 .gpl_only = false, 2540 .ret_type = RET_INTEGER, 2541 .arg1_type = ARG_ANYTHING, 2542 .arg2_type = ARG_ANYTHING, 2543 }; 2544 2545 BPF_CALL_4(bpf_redirect_neigh, u32, ifindex, struct bpf_redir_neigh *, params, 2546 int, plen, u64, flags) 2547 { 2548 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2549 2550 if (unlikely((plen && plen < sizeof(*params)) || flags)) 2551 return TC_ACT_SHOT; 2552 2553 ri->flags = BPF_F_NEIGH | (plen ? BPF_F_NEXTHOP : 0); 2554 ri->tgt_index = ifindex; 2555 2556 BUILD_BUG_ON(sizeof(struct bpf_redir_neigh) != sizeof(struct bpf_nh_params)); 2557 if (plen) 2558 memcpy(&ri->nh, params, sizeof(ri->nh)); 2559 2560 return TC_ACT_REDIRECT; 2561 } 2562 2563 static const struct bpf_func_proto bpf_redirect_neigh_proto = { 2564 .func = bpf_redirect_neigh, 2565 .gpl_only = false, 2566 .ret_type = RET_INTEGER, 2567 .arg1_type = ARG_ANYTHING, 2568 .arg2_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY, 2569 .arg3_type = ARG_CONST_SIZE_OR_ZERO, 2570 .arg4_type = ARG_ANYTHING, 2571 }; 2572 2573 BPF_CALL_2(bpf_msg_apply_bytes, struct sk_msg *, msg, u32, bytes) 2574 { 2575 msg->apply_bytes = bytes; 2576 return 0; 2577 } 2578 2579 static const struct bpf_func_proto bpf_msg_apply_bytes_proto = { 2580 .func = bpf_msg_apply_bytes, 2581 .gpl_only = false, 2582 .ret_type = RET_INTEGER, 2583 .arg1_type = ARG_PTR_TO_CTX, 2584 .arg2_type = ARG_ANYTHING, 2585 }; 2586 2587 BPF_CALL_2(bpf_msg_cork_bytes, struct sk_msg *, msg, u32, bytes) 2588 { 2589 msg->cork_bytes = bytes; 2590 return 0; 2591 } 2592 2593 static const struct bpf_func_proto bpf_msg_cork_bytes_proto = { 2594 .func = bpf_msg_cork_bytes, 2595 .gpl_only = false, 2596 .ret_type = RET_INTEGER, 2597 .arg1_type = ARG_PTR_TO_CTX, 2598 .arg2_type = ARG_ANYTHING, 2599 }; 2600 2601 BPF_CALL_4(bpf_msg_pull_data, struct sk_msg *, msg, u32, start, 2602 u32, end, u64, flags) 2603 { 2604 u32 len = 0, offset = 0, copy = 0, poffset = 0, bytes = end - start; 2605 u32 first_sge, last_sge, i, shift, bytes_sg_total; 2606 struct scatterlist *sge; 2607 u8 *raw, *to, *from; 2608 struct page *page; 2609 2610 if (unlikely(flags || end <= start)) 2611 return -EINVAL; 2612 2613 /* First find the starting scatterlist element */ 2614 i = msg->sg.start; 2615 do { 2616 offset += len; 2617 len = sk_msg_elem(msg, i)->length; 2618 if (start < offset + len) 2619 break; 2620 sk_msg_iter_var_next(i); 2621 } while (i != msg->sg.end); 2622 2623 if (unlikely(start >= offset + len)) 2624 return -EINVAL; 2625 2626 first_sge = i; 2627 /* The start may point into the sg element so we need to also 2628 * account for the headroom. 2629 */ 2630 bytes_sg_total = start - offset + bytes; 2631 if (!test_bit(i, msg->sg.copy) && bytes_sg_total <= len) 2632 goto out; 2633 2634 /* At this point we need to linearize multiple scatterlist 2635 * elements or a single shared page. Either way we need to 2636 * copy into a linear buffer exclusively owned by BPF. Then 2637 * place the buffer in the scatterlist and fixup the original 2638 * entries by removing the entries now in the linear buffer 2639 * and shifting the remaining entries. For now we do not try 2640 * to copy partial entries to avoid complexity of running out 2641 * of sg_entry slots. The downside is reading a single byte 2642 * will copy the entire sg entry. 2643 */ 2644 do { 2645 copy += sk_msg_elem(msg, i)->length; 2646 sk_msg_iter_var_next(i); 2647 if (bytes_sg_total <= copy) 2648 break; 2649 } while (i != msg->sg.end); 2650 last_sge = i; 2651 2652 if (unlikely(bytes_sg_total > copy)) 2653 return -EINVAL; 2654 2655 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, 2656 get_order(copy)); 2657 if (unlikely(!page)) 2658 return -ENOMEM; 2659 2660 raw = page_address(page); 2661 i = first_sge; 2662 do { 2663 sge = sk_msg_elem(msg, i); 2664 from = sg_virt(sge); 2665 len = sge->length; 2666 to = raw + poffset; 2667 2668 memcpy(to, from, len); 2669 poffset += len; 2670 sge->length = 0; 2671 put_page(sg_page(sge)); 2672 2673 sk_msg_iter_var_next(i); 2674 } while (i != last_sge); 2675 2676 sg_set_page(&msg->sg.data[first_sge], page, copy, 0); 2677 2678 /* To repair sg ring we need to shift entries. If we only 2679 * had a single entry though we can just replace it and 2680 * be done. Otherwise walk the ring and shift the entries. 2681 */ 2682 WARN_ON_ONCE(last_sge == first_sge); 2683 shift = last_sge > first_sge ? 2684 last_sge - first_sge - 1 : 2685 NR_MSG_FRAG_IDS - first_sge + last_sge - 1; 2686 if (!shift) 2687 goto out; 2688 2689 i = first_sge; 2690 sk_msg_iter_var_next(i); 2691 do { 2692 u32 move_from; 2693 2694 if (i + shift >= NR_MSG_FRAG_IDS) 2695 move_from = i + shift - NR_MSG_FRAG_IDS; 2696 else 2697 move_from = i + shift; 2698 if (move_from == msg->sg.end) 2699 break; 2700 2701 msg->sg.data[i] = msg->sg.data[move_from]; 2702 msg->sg.data[move_from].length = 0; 2703 msg->sg.data[move_from].page_link = 0; 2704 msg->sg.data[move_from].offset = 0; 2705 sk_msg_iter_var_next(i); 2706 } while (1); 2707 2708 msg->sg.end = msg->sg.end - shift > msg->sg.end ? 2709 msg->sg.end - shift + NR_MSG_FRAG_IDS : 2710 msg->sg.end - shift; 2711 out: 2712 msg->data = sg_virt(&msg->sg.data[first_sge]) + start - offset; 2713 msg->data_end = msg->data + bytes; 2714 return 0; 2715 } 2716 2717 static const struct bpf_func_proto bpf_msg_pull_data_proto = { 2718 .func = bpf_msg_pull_data, 2719 .gpl_only = false, 2720 .ret_type = RET_INTEGER, 2721 .arg1_type = ARG_PTR_TO_CTX, 2722 .arg2_type = ARG_ANYTHING, 2723 .arg3_type = ARG_ANYTHING, 2724 .arg4_type = ARG_ANYTHING, 2725 }; 2726 2727 BPF_CALL_4(bpf_msg_push_data, struct sk_msg *, msg, u32, start, 2728 u32, len, u64, flags) 2729 { 2730 struct scatterlist sge, nsge, nnsge, rsge = {0}, *psge; 2731 u32 new, i = 0, l = 0, space, copy = 0, offset = 0; 2732 u8 *raw, *to, *from; 2733 struct page *page; 2734 2735 if (unlikely(flags)) 2736 return -EINVAL; 2737 2738 if (unlikely(len == 0)) 2739 return 0; 2740 2741 /* First find the starting scatterlist element */ 2742 i = msg->sg.start; 2743 do { 2744 offset += l; 2745 l = sk_msg_elem(msg, i)->length; 2746 2747 if (start < offset + l) 2748 break; 2749 sk_msg_iter_var_next(i); 2750 } while (i != msg->sg.end); 2751 2752 if (start >= offset + l) 2753 return -EINVAL; 2754 2755 space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); 2756 2757 /* If no space available will fallback to copy, we need at 2758 * least one scatterlist elem available to push data into 2759 * when start aligns to the beginning of an element or two 2760 * when it falls inside an element. We handle the start equals 2761 * offset case because its the common case for inserting a 2762 * header. 2763 */ 2764 if (!space || (space == 1 && start != offset)) 2765 copy = msg->sg.data[i].length; 2766 2767 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, 2768 get_order(copy + len)); 2769 if (unlikely(!page)) 2770 return -ENOMEM; 2771 2772 if (copy) { 2773 int front, back; 2774 2775 raw = page_address(page); 2776 2777 psge = sk_msg_elem(msg, i); 2778 front = start - offset; 2779 back = psge->length - front; 2780 from = sg_virt(psge); 2781 2782 if (front) 2783 memcpy(raw, from, front); 2784 2785 if (back) { 2786 from += front; 2787 to = raw + front + len; 2788 2789 memcpy(to, from, back); 2790 } 2791 2792 put_page(sg_page(psge)); 2793 } else if (start - offset) { 2794 psge = sk_msg_elem(msg, i); 2795 rsge = sk_msg_elem_cpy(msg, i); 2796 2797 psge->length = start - offset; 2798 rsge.length -= psge->length; 2799 rsge.offset += start; 2800 2801 sk_msg_iter_var_next(i); 2802 sg_unmark_end(psge); 2803 sg_unmark_end(&rsge); 2804 sk_msg_iter_next(msg, end); 2805 } 2806 2807 /* Slot(s) to place newly allocated data */ 2808 new = i; 2809 2810 /* Shift one or two slots as needed */ 2811 if (!copy) { 2812 sge = sk_msg_elem_cpy(msg, i); 2813 2814 sk_msg_iter_var_next(i); 2815 sg_unmark_end(&sge); 2816 sk_msg_iter_next(msg, end); 2817 2818 nsge = sk_msg_elem_cpy(msg, i); 2819 if (rsge.length) { 2820 sk_msg_iter_var_next(i); 2821 nnsge = sk_msg_elem_cpy(msg, i); 2822 } 2823 2824 while (i != msg->sg.end) { 2825 msg->sg.data[i] = sge; 2826 sge = nsge; 2827 sk_msg_iter_var_next(i); 2828 if (rsge.length) { 2829 nsge = nnsge; 2830 nnsge = sk_msg_elem_cpy(msg, i); 2831 } else { 2832 nsge = sk_msg_elem_cpy(msg, i); 2833 } 2834 } 2835 } 2836 2837 /* Place newly allocated data buffer */ 2838 sk_mem_charge(msg->sk, len); 2839 msg->sg.size += len; 2840 __clear_bit(new, msg->sg.copy); 2841 sg_set_page(&msg->sg.data[new], page, len + copy, 0); 2842 if (rsge.length) { 2843 get_page(sg_page(&rsge)); 2844 sk_msg_iter_var_next(new); 2845 msg->sg.data[new] = rsge; 2846 } 2847 2848 sk_msg_compute_data_pointers(msg); 2849 return 0; 2850 } 2851 2852 static const struct bpf_func_proto bpf_msg_push_data_proto = { 2853 .func = bpf_msg_push_data, 2854 .gpl_only = false, 2855 .ret_type = RET_INTEGER, 2856 .arg1_type = ARG_PTR_TO_CTX, 2857 .arg2_type = ARG_ANYTHING, 2858 .arg3_type = ARG_ANYTHING, 2859 .arg4_type = ARG_ANYTHING, 2860 }; 2861 2862 static void sk_msg_shift_left(struct sk_msg *msg, int i) 2863 { 2864 int prev; 2865 2866 do { 2867 prev = i; 2868 sk_msg_iter_var_next(i); 2869 msg->sg.data[prev] = msg->sg.data[i]; 2870 } while (i != msg->sg.end); 2871 2872 sk_msg_iter_prev(msg, end); 2873 } 2874 2875 static void sk_msg_shift_right(struct sk_msg *msg, int i) 2876 { 2877 struct scatterlist tmp, sge; 2878 2879 sk_msg_iter_next(msg, end); 2880 sge = sk_msg_elem_cpy(msg, i); 2881 sk_msg_iter_var_next(i); 2882 tmp = sk_msg_elem_cpy(msg, i); 2883 2884 while (i != msg->sg.end) { 2885 msg->sg.data[i] = sge; 2886 sk_msg_iter_var_next(i); 2887 sge = tmp; 2888 tmp = sk_msg_elem_cpy(msg, i); 2889 } 2890 } 2891 2892 BPF_CALL_4(bpf_msg_pop_data, struct sk_msg *, msg, u32, start, 2893 u32, len, u64, flags) 2894 { 2895 u32 i = 0, l = 0, space, offset = 0; 2896 u64 last = start + len; 2897 int pop; 2898 2899 if (unlikely(flags)) 2900 return -EINVAL; 2901 2902 /* First find the starting scatterlist element */ 2903 i = msg->sg.start; 2904 do { 2905 offset += l; 2906 l = sk_msg_elem(msg, i)->length; 2907 2908 if (start < offset + l) 2909 break; 2910 sk_msg_iter_var_next(i); 2911 } while (i != msg->sg.end); 2912 2913 /* Bounds checks: start and pop must be inside message */ 2914 if (start >= offset + l || last >= msg->sg.size) 2915 return -EINVAL; 2916 2917 space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); 2918 2919 pop = len; 2920 /* --------------| offset 2921 * -| start |-------- len -------| 2922 * 2923 * |----- a ----|-------- pop -------|----- b ----| 2924 * |______________________________________________| length 2925 * 2926 * 2927 * a: region at front of scatter element to save 2928 * b: region at back of scatter element to save when length > A + pop 2929 * pop: region to pop from element, same as input 'pop' here will be 2930 * decremented below per iteration. 2931 * 2932 * Two top-level cases to handle when start != offset, first B is non 2933 * zero and second B is zero corresponding to when a pop includes more 2934 * than one element. 2935 * 2936 * Then if B is non-zero AND there is no space allocate space and 2937 * compact A, B regions into page. If there is space shift ring to 2938 * the rigth free'ing the next element in ring to place B, leaving 2939 * A untouched except to reduce length. 2940 */ 2941 if (start != offset) { 2942 struct scatterlist *nsge, *sge = sk_msg_elem(msg, i); 2943 int a = start; 2944 int b = sge->length - pop - a; 2945 2946 sk_msg_iter_var_next(i); 2947 2948 if (pop < sge->length - a) { 2949 if (space) { 2950 sge->length = a; 2951 sk_msg_shift_right(msg, i); 2952 nsge = sk_msg_elem(msg, i); 2953 get_page(sg_page(sge)); 2954 sg_set_page(nsge, 2955 sg_page(sge), 2956 b, sge->offset + pop + a); 2957 } else { 2958 struct page *page, *orig; 2959 u8 *to, *from; 2960 2961 page = alloc_pages(__GFP_NOWARN | 2962 __GFP_COMP | GFP_ATOMIC, 2963 get_order(a + b)); 2964 if (unlikely(!page)) 2965 return -ENOMEM; 2966 2967 sge->length = a; 2968 orig = sg_page(sge); 2969 from = sg_virt(sge); 2970 to = page_address(page); 2971 memcpy(to, from, a); 2972 memcpy(to + a, from + a + pop, b); 2973 sg_set_page(sge, page, a + b, 0); 2974 put_page(orig); 2975 } 2976 pop = 0; 2977 } else if (pop >= sge->length - a) { 2978 pop -= (sge->length - a); 2979 sge->length = a; 2980 } 2981 } 2982 2983 /* From above the current layout _must_ be as follows, 2984 * 2985 * -| offset 2986 * -| start 2987 * 2988 * |---- pop ---|---------------- b ------------| 2989 * |____________________________________________| length 2990 * 2991 * Offset and start of the current msg elem are equal because in the 2992 * previous case we handled offset != start and either consumed the 2993 * entire element and advanced to the next element OR pop == 0. 2994 * 2995 * Two cases to handle here are first pop is less than the length 2996 * leaving some remainder b above. Simply adjust the element's layout 2997 * in this case. Or pop >= length of the element so that b = 0. In this 2998 * case advance to next element decrementing pop. 2999 */ 3000 while (pop) { 3001 struct scatterlist *sge = sk_msg_elem(msg, i); 3002 3003 if (pop < sge->length) { 3004 sge->length -= pop; 3005 sge->offset += pop; 3006 pop = 0; 3007 } else { 3008 pop -= sge->length; 3009 sk_msg_shift_left(msg, i); 3010 } 3011 sk_msg_iter_var_next(i); 3012 } 3013 3014 sk_mem_uncharge(msg->sk, len - pop); 3015 msg->sg.size -= (len - pop); 3016 sk_msg_compute_data_pointers(msg); 3017 return 0; 3018 } 3019 3020 static const struct bpf_func_proto bpf_msg_pop_data_proto = { 3021 .func = bpf_msg_pop_data, 3022 .gpl_only = false, 3023 .ret_type = RET_INTEGER, 3024 .arg1_type = ARG_PTR_TO_CTX, 3025 .arg2_type = ARG_ANYTHING, 3026 .arg3_type = ARG_ANYTHING, 3027 .arg4_type = ARG_ANYTHING, 3028 }; 3029 3030 #ifdef CONFIG_CGROUP_NET_CLASSID 3031 BPF_CALL_0(bpf_get_cgroup_classid_curr) 3032 { 3033 return __task_get_classid(current); 3034 } 3035 3036 const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto = { 3037 .func = bpf_get_cgroup_classid_curr, 3038 .gpl_only = false, 3039 .ret_type = RET_INTEGER, 3040 }; 3041 3042 BPF_CALL_1(bpf_skb_cgroup_classid, const struct sk_buff *, skb) 3043 { 3044 struct sock *sk = skb_to_full_sk(skb); 3045 3046 if (!sk || !sk_fullsock(sk)) 3047 return 0; 3048 3049 return sock_cgroup_classid(&sk->sk_cgrp_data); 3050 } 3051 3052 static const struct bpf_func_proto bpf_skb_cgroup_classid_proto = { 3053 .func = bpf_skb_cgroup_classid, 3054 .gpl_only = false, 3055 .ret_type = RET_INTEGER, 3056 .arg1_type = ARG_PTR_TO_CTX, 3057 }; 3058 #endif 3059 3060 BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb) 3061 { 3062 return task_get_classid(skb); 3063 } 3064 3065 static const struct bpf_func_proto bpf_get_cgroup_classid_proto = { 3066 .func = bpf_get_cgroup_classid, 3067 .gpl_only = false, 3068 .ret_type = RET_INTEGER, 3069 .arg1_type = ARG_PTR_TO_CTX, 3070 }; 3071 3072 BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb) 3073 { 3074 return dst_tclassid(skb); 3075 } 3076 3077 static const struct bpf_func_proto bpf_get_route_realm_proto = { 3078 .func = bpf_get_route_realm, 3079 .gpl_only = false, 3080 .ret_type = RET_INTEGER, 3081 .arg1_type = ARG_PTR_TO_CTX, 3082 }; 3083 3084 BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb) 3085 { 3086 /* If skb_clear_hash() was called due to mangling, we can 3087 * trigger SW recalculation here. Later access to hash 3088 * can then use the inline skb->hash via context directly 3089 * instead of calling this helper again. 3090 */ 3091 return skb_get_hash(skb); 3092 } 3093 3094 static const struct bpf_func_proto bpf_get_hash_recalc_proto = { 3095 .func = bpf_get_hash_recalc, 3096 .gpl_only = false, 3097 .ret_type = RET_INTEGER, 3098 .arg1_type = ARG_PTR_TO_CTX, 3099 }; 3100 3101 BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb) 3102 { 3103 /* After all direct packet write, this can be used once for 3104 * triggering a lazy recalc on next skb_get_hash() invocation. 3105 */ 3106 skb_clear_hash(skb); 3107 return 0; 3108 } 3109 3110 static const struct bpf_func_proto bpf_set_hash_invalid_proto = { 3111 .func = bpf_set_hash_invalid, 3112 .gpl_only = false, 3113 .ret_type = RET_INTEGER, 3114 .arg1_type = ARG_PTR_TO_CTX, 3115 }; 3116 3117 BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash) 3118 { 3119 /* Set user specified hash as L4(+), so that it gets returned 3120 * on skb_get_hash() call unless BPF prog later on triggers a 3121 * skb_clear_hash(). 3122 */ 3123 __skb_set_sw_hash(skb, hash, true); 3124 return 0; 3125 } 3126 3127 static const struct bpf_func_proto bpf_set_hash_proto = { 3128 .func = bpf_set_hash, 3129 .gpl_only = false, 3130 .ret_type = RET_INTEGER, 3131 .arg1_type = ARG_PTR_TO_CTX, 3132 .arg2_type = ARG_ANYTHING, 3133 }; 3134 3135 BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto, 3136 u16, vlan_tci) 3137 { 3138 int ret; 3139 3140 if (unlikely(vlan_proto != htons(ETH_P_8021Q) && 3141 vlan_proto != htons(ETH_P_8021AD))) 3142 vlan_proto = htons(ETH_P_8021Q); 3143 3144 bpf_push_mac_rcsum(skb); 3145 ret = skb_vlan_push(skb, vlan_proto, vlan_tci); 3146 bpf_pull_mac_rcsum(skb); 3147 3148 bpf_compute_data_pointers(skb); 3149 return ret; 3150 } 3151 3152 static const struct bpf_func_proto bpf_skb_vlan_push_proto = { 3153 .func = bpf_skb_vlan_push, 3154 .gpl_only = false, 3155 .ret_type = RET_INTEGER, 3156 .arg1_type = ARG_PTR_TO_CTX, 3157 .arg2_type = ARG_ANYTHING, 3158 .arg3_type = ARG_ANYTHING, 3159 }; 3160 3161 BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb) 3162 { 3163 int ret; 3164 3165 bpf_push_mac_rcsum(skb); 3166 ret = skb_vlan_pop(skb); 3167 bpf_pull_mac_rcsum(skb); 3168 3169 bpf_compute_data_pointers(skb); 3170 return ret; 3171 } 3172 3173 static const struct bpf_func_proto bpf_skb_vlan_pop_proto = { 3174 .func = bpf_skb_vlan_pop, 3175 .gpl_only = false, 3176 .ret_type = RET_INTEGER, 3177 .arg1_type = ARG_PTR_TO_CTX, 3178 }; 3179 3180 static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len) 3181 { 3182 /* Caller already did skb_cow() with len as headroom, 3183 * so no need to do it here. 3184 */ 3185 skb_push(skb, len); 3186 memmove(skb->data, skb->data + len, off); 3187 memset(skb->data + off, 0, len); 3188 3189 /* No skb_postpush_rcsum(skb, skb->data + off, len) 3190 * needed here as it does not change the skb->csum 3191 * result for checksum complete when summing over 3192 * zeroed blocks. 3193 */ 3194 return 0; 3195 } 3196 3197 static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len) 3198 { 3199 void *old_data; 3200 3201 /* skb_ensure_writable() is not needed here, as we're 3202 * already working on an uncloned skb. 3203 */ 3204 if (unlikely(!pskb_may_pull(skb, off + len))) 3205 return -ENOMEM; 3206 3207 old_data = skb->data; 3208 __skb_pull(skb, len); 3209 skb_postpull_rcsum(skb, old_data + off, len); 3210 memmove(skb->data, old_data, off); 3211 3212 return 0; 3213 } 3214 3215 static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len) 3216 { 3217 bool trans_same = skb->transport_header == skb->network_header; 3218 int ret; 3219 3220 /* There's no need for __skb_push()/__skb_pull() pair to 3221 * get to the start of the mac header as we're guaranteed 3222 * to always start from here under eBPF. 3223 */ 3224 ret = bpf_skb_generic_push(skb, off, len); 3225 if (likely(!ret)) { 3226 skb->mac_header -= len; 3227 skb->network_header -= len; 3228 if (trans_same) 3229 skb->transport_header = skb->network_header; 3230 } 3231 3232 return ret; 3233 } 3234 3235 static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len) 3236 { 3237 bool trans_same = skb->transport_header == skb->network_header; 3238 int ret; 3239 3240 /* Same here, __skb_push()/__skb_pull() pair not needed. */ 3241 ret = bpf_skb_generic_pop(skb, off, len); 3242 if (likely(!ret)) { 3243 skb->mac_header += len; 3244 skb->network_header += len; 3245 if (trans_same) 3246 skb->transport_header = skb->network_header; 3247 } 3248 3249 return ret; 3250 } 3251 3252 static int bpf_skb_proto_4_to_6(struct sk_buff *skb) 3253 { 3254 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); 3255 u32 off = skb_mac_header_len(skb); 3256 int ret; 3257 3258 ret = skb_cow(skb, len_diff); 3259 if (unlikely(ret < 0)) 3260 return ret; 3261 3262 ret = bpf_skb_net_hdr_push(skb, off, len_diff); 3263 if (unlikely(ret < 0)) 3264 return ret; 3265 3266 if (skb_is_gso(skb)) { 3267 struct skb_shared_info *shinfo = skb_shinfo(skb); 3268 3269 /* SKB_GSO_TCPV4 needs to be changed into SKB_GSO_TCPV6. */ 3270 if (shinfo->gso_type & SKB_GSO_TCPV4) { 3271 shinfo->gso_type &= ~SKB_GSO_TCPV4; 3272 shinfo->gso_type |= SKB_GSO_TCPV6; 3273 } 3274 } 3275 3276 skb->protocol = htons(ETH_P_IPV6); 3277 skb_clear_hash(skb); 3278 3279 return 0; 3280 } 3281 3282 static int bpf_skb_proto_6_to_4(struct sk_buff *skb) 3283 { 3284 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); 3285 u32 off = skb_mac_header_len(skb); 3286 int ret; 3287 3288 ret = skb_unclone(skb, GFP_ATOMIC); 3289 if (unlikely(ret < 0)) 3290 return ret; 3291 3292 ret = bpf_skb_net_hdr_pop(skb, off, len_diff); 3293 if (unlikely(ret < 0)) 3294 return ret; 3295 3296 if (skb_is_gso(skb)) { 3297 struct skb_shared_info *shinfo = skb_shinfo(skb); 3298 3299 /* SKB_GSO_TCPV6 needs to be changed into SKB_GSO_TCPV4. */ 3300 if (shinfo->gso_type & SKB_GSO_TCPV6) { 3301 shinfo->gso_type &= ~SKB_GSO_TCPV6; 3302 shinfo->gso_type |= SKB_GSO_TCPV4; 3303 } 3304 } 3305 3306 skb->protocol = htons(ETH_P_IP); 3307 skb_clear_hash(skb); 3308 3309 return 0; 3310 } 3311 3312 static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto) 3313 { 3314 __be16 from_proto = skb->protocol; 3315 3316 if (from_proto == htons(ETH_P_IP) && 3317 to_proto == htons(ETH_P_IPV6)) 3318 return bpf_skb_proto_4_to_6(skb); 3319 3320 if (from_proto == htons(ETH_P_IPV6) && 3321 to_proto == htons(ETH_P_IP)) 3322 return bpf_skb_proto_6_to_4(skb); 3323 3324 return -ENOTSUPP; 3325 } 3326 3327 BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto, 3328 u64, flags) 3329 { 3330 int ret; 3331 3332 if (unlikely(flags)) 3333 return -EINVAL; 3334 3335 /* General idea is that this helper does the basic groundwork 3336 * needed for changing the protocol, and eBPF program fills the 3337 * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace() 3338 * and other helpers, rather than passing a raw buffer here. 3339 * 3340 * The rationale is to keep this minimal and without a need to 3341 * deal with raw packet data. F.e. even if we would pass buffers 3342 * here, the program still needs to call the bpf_lX_csum_replace() 3343 * helpers anyway. Plus, this way we keep also separation of 3344 * concerns, since f.e. bpf_skb_store_bytes() should only take 3345 * care of stores. 3346 * 3347 * Currently, additional options and extension header space are 3348 * not supported, but flags register is reserved so we can adapt 3349 * that. For offloads, we mark packet as dodgy, so that headers 3350 * need to be verified first. 3351 */ 3352 ret = bpf_skb_proto_xlat(skb, proto); 3353 bpf_compute_data_pointers(skb); 3354 return ret; 3355 } 3356 3357 static const struct bpf_func_proto bpf_skb_change_proto_proto = { 3358 .func = bpf_skb_change_proto, 3359 .gpl_only = false, 3360 .ret_type = RET_INTEGER, 3361 .arg1_type = ARG_PTR_TO_CTX, 3362 .arg2_type = ARG_ANYTHING, 3363 .arg3_type = ARG_ANYTHING, 3364 }; 3365 3366 BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type) 3367 { 3368 /* We only allow a restricted subset to be changed for now. */ 3369 if (unlikely(!skb_pkt_type_ok(skb->pkt_type) || 3370 !skb_pkt_type_ok(pkt_type))) 3371 return -EINVAL; 3372 3373 skb->pkt_type = pkt_type; 3374 return 0; 3375 } 3376 3377 static const struct bpf_func_proto bpf_skb_change_type_proto = { 3378 .func = bpf_skb_change_type, 3379 .gpl_only = false, 3380 .ret_type = RET_INTEGER, 3381 .arg1_type = ARG_PTR_TO_CTX, 3382 .arg2_type = ARG_ANYTHING, 3383 }; 3384 3385 static u32 bpf_skb_net_base_len(const struct sk_buff *skb) 3386 { 3387 switch (skb->protocol) { 3388 case htons(ETH_P_IP): 3389 return sizeof(struct iphdr); 3390 case htons(ETH_P_IPV6): 3391 return sizeof(struct ipv6hdr); 3392 default: 3393 return ~0U; 3394 } 3395 } 3396 3397 #define BPF_F_ADJ_ROOM_ENCAP_L3_MASK (BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 | \ 3398 BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3399 3400 #define BPF_F_ADJ_ROOM_DECAP_L3_MASK (BPF_F_ADJ_ROOM_DECAP_L3_IPV4 | \ 3401 BPF_F_ADJ_ROOM_DECAP_L3_IPV6) 3402 3403 #define BPF_F_ADJ_ROOM_MASK (BPF_F_ADJ_ROOM_FIXED_GSO | \ 3404 BPF_F_ADJ_ROOM_ENCAP_L3_MASK | \ 3405 BPF_F_ADJ_ROOM_ENCAP_L4_GRE | \ 3406 BPF_F_ADJ_ROOM_ENCAP_L4_UDP | \ 3407 BPF_F_ADJ_ROOM_ENCAP_L2_ETH | \ 3408 BPF_F_ADJ_ROOM_ENCAP_L2( \ 3409 BPF_ADJ_ROOM_ENCAP_L2_MASK) | \ 3410 BPF_F_ADJ_ROOM_DECAP_L3_MASK) 3411 3412 static int bpf_skb_net_grow(struct sk_buff *skb, u32 off, u32 len_diff, 3413 u64 flags) 3414 { 3415 u8 inner_mac_len = flags >> BPF_ADJ_ROOM_ENCAP_L2_SHIFT; 3416 bool encap = flags & BPF_F_ADJ_ROOM_ENCAP_L3_MASK; 3417 u16 mac_len = 0, inner_net = 0, inner_trans = 0; 3418 unsigned int gso_type = SKB_GSO_DODGY; 3419 int ret; 3420 3421 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { 3422 /* udp gso_size delineates datagrams, only allow if fixed */ 3423 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || 3424 !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3425 return -ENOTSUPP; 3426 } 3427 3428 ret = skb_cow_head(skb, len_diff); 3429 if (unlikely(ret < 0)) 3430 return ret; 3431 3432 if (encap) { 3433 if (skb->protocol != htons(ETH_P_IP) && 3434 skb->protocol != htons(ETH_P_IPV6)) 3435 return -ENOTSUPP; 3436 3437 if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 && 3438 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3439 return -EINVAL; 3440 3441 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE && 3442 flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) 3443 return -EINVAL; 3444 3445 if (flags & BPF_F_ADJ_ROOM_ENCAP_L2_ETH && 3446 inner_mac_len < ETH_HLEN) 3447 return -EINVAL; 3448 3449 if (skb->encapsulation) 3450 return -EALREADY; 3451 3452 mac_len = skb->network_header - skb->mac_header; 3453 inner_net = skb->network_header; 3454 if (inner_mac_len > len_diff) 3455 return -EINVAL; 3456 inner_trans = skb->transport_header; 3457 } 3458 3459 ret = bpf_skb_net_hdr_push(skb, off, len_diff); 3460 if (unlikely(ret < 0)) 3461 return ret; 3462 3463 if (encap) { 3464 skb->inner_mac_header = inner_net - inner_mac_len; 3465 skb->inner_network_header = inner_net; 3466 skb->inner_transport_header = inner_trans; 3467 3468 if (flags & BPF_F_ADJ_ROOM_ENCAP_L2_ETH) 3469 skb_set_inner_protocol(skb, htons(ETH_P_TEB)); 3470 else 3471 skb_set_inner_protocol(skb, skb->protocol); 3472 3473 skb->encapsulation = 1; 3474 skb_set_network_header(skb, mac_len); 3475 3476 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) 3477 gso_type |= SKB_GSO_UDP_TUNNEL; 3478 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE) 3479 gso_type |= SKB_GSO_GRE; 3480 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3481 gso_type |= SKB_GSO_IPXIP6; 3482 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) 3483 gso_type |= SKB_GSO_IPXIP4; 3484 3485 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE || 3486 flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) { 3487 int nh_len = flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6 ? 3488 sizeof(struct ipv6hdr) : 3489 sizeof(struct iphdr); 3490 3491 skb_set_transport_header(skb, mac_len + nh_len); 3492 } 3493 3494 /* Match skb->protocol to new outer l3 protocol */ 3495 if (skb->protocol == htons(ETH_P_IP) && 3496 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3497 skb->protocol = htons(ETH_P_IPV6); 3498 else if (skb->protocol == htons(ETH_P_IPV6) && 3499 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) 3500 skb->protocol = htons(ETH_P_IP); 3501 } 3502 3503 if (skb_is_gso(skb)) { 3504 struct skb_shared_info *shinfo = skb_shinfo(skb); 3505 3506 /* Due to header grow, MSS needs to be downgraded. */ 3507 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3508 skb_decrease_gso_size(shinfo, len_diff); 3509 3510 /* Header must be checked, and gso_segs recomputed. */ 3511 shinfo->gso_type |= gso_type; 3512 shinfo->gso_segs = 0; 3513 } 3514 3515 return 0; 3516 } 3517 3518 static int bpf_skb_net_shrink(struct sk_buff *skb, u32 off, u32 len_diff, 3519 u64 flags) 3520 { 3521 int ret; 3522 3523 if (unlikely(flags & ~(BPF_F_ADJ_ROOM_FIXED_GSO | 3524 BPF_F_ADJ_ROOM_DECAP_L3_MASK | 3525 BPF_F_ADJ_ROOM_NO_CSUM_RESET))) 3526 return -EINVAL; 3527 3528 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { 3529 /* udp gso_size delineates datagrams, only allow if fixed */ 3530 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || 3531 !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3532 return -ENOTSUPP; 3533 } 3534 3535 ret = skb_unclone(skb, GFP_ATOMIC); 3536 if (unlikely(ret < 0)) 3537 return ret; 3538 3539 ret = bpf_skb_net_hdr_pop(skb, off, len_diff); 3540 if (unlikely(ret < 0)) 3541 return ret; 3542 3543 /* Match skb->protocol to new outer l3 protocol */ 3544 if (skb->protocol == htons(ETH_P_IP) && 3545 flags & BPF_F_ADJ_ROOM_DECAP_L3_IPV6) 3546 skb->protocol = htons(ETH_P_IPV6); 3547 else if (skb->protocol == htons(ETH_P_IPV6) && 3548 flags & BPF_F_ADJ_ROOM_DECAP_L3_IPV4) 3549 skb->protocol = htons(ETH_P_IP); 3550 3551 if (skb_is_gso(skb)) { 3552 struct skb_shared_info *shinfo = skb_shinfo(skb); 3553 3554 /* Due to header shrink, MSS can be upgraded. */ 3555 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3556 skb_increase_gso_size(shinfo, len_diff); 3557 3558 /* Header must be checked, and gso_segs recomputed. */ 3559 shinfo->gso_type |= SKB_GSO_DODGY; 3560 shinfo->gso_segs = 0; 3561 } 3562 3563 return 0; 3564 } 3565 3566 #define BPF_SKB_MAX_LEN SKB_MAX_ALLOC 3567 3568 BPF_CALL_4(sk_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, 3569 u32, mode, u64, flags) 3570 { 3571 u32 len_diff_abs = abs(len_diff); 3572 bool shrink = len_diff < 0; 3573 int ret = 0; 3574 3575 if (unlikely(flags || mode)) 3576 return -EINVAL; 3577 if (unlikely(len_diff_abs > 0xfffU)) 3578 return -EFAULT; 3579 3580 if (!shrink) { 3581 ret = skb_cow(skb, len_diff); 3582 if (unlikely(ret < 0)) 3583 return ret; 3584 __skb_push(skb, len_diff_abs); 3585 memset(skb->data, 0, len_diff_abs); 3586 } else { 3587 if (unlikely(!pskb_may_pull(skb, len_diff_abs))) 3588 return -ENOMEM; 3589 __skb_pull(skb, len_diff_abs); 3590 } 3591 if (tls_sw_has_ctx_rx(skb->sk)) { 3592 struct strp_msg *rxm = strp_msg(skb); 3593 3594 rxm->full_len += len_diff; 3595 } 3596 return ret; 3597 } 3598 3599 static const struct bpf_func_proto sk_skb_adjust_room_proto = { 3600 .func = sk_skb_adjust_room, 3601 .gpl_only = false, 3602 .ret_type = RET_INTEGER, 3603 .arg1_type = ARG_PTR_TO_CTX, 3604 .arg2_type = ARG_ANYTHING, 3605 .arg3_type = ARG_ANYTHING, 3606 .arg4_type = ARG_ANYTHING, 3607 }; 3608 3609 BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, 3610 u32, mode, u64, flags) 3611 { 3612 u32 len_cur, len_diff_abs = abs(len_diff); 3613 u32 len_min = bpf_skb_net_base_len(skb); 3614 u32 len_max = BPF_SKB_MAX_LEN; 3615 __be16 proto = skb->protocol; 3616 bool shrink = len_diff < 0; 3617 u32 off; 3618 int ret; 3619 3620 if (unlikely(flags & ~(BPF_F_ADJ_ROOM_MASK | 3621 BPF_F_ADJ_ROOM_NO_CSUM_RESET))) 3622 return -EINVAL; 3623 if (unlikely(len_diff_abs > 0xfffU)) 3624 return -EFAULT; 3625 if (unlikely(proto != htons(ETH_P_IP) && 3626 proto != htons(ETH_P_IPV6))) 3627 return -ENOTSUPP; 3628 3629 off = skb_mac_header_len(skb); 3630 switch (mode) { 3631 case BPF_ADJ_ROOM_NET: 3632 off += bpf_skb_net_base_len(skb); 3633 break; 3634 case BPF_ADJ_ROOM_MAC: 3635 break; 3636 default: 3637 return -ENOTSUPP; 3638 } 3639 3640 if (flags & BPF_F_ADJ_ROOM_DECAP_L3_MASK) { 3641 if (!shrink) 3642 return -EINVAL; 3643 3644 switch (flags & BPF_F_ADJ_ROOM_DECAP_L3_MASK) { 3645 case BPF_F_ADJ_ROOM_DECAP_L3_IPV4: 3646 len_min = sizeof(struct iphdr); 3647 break; 3648 case BPF_F_ADJ_ROOM_DECAP_L3_IPV6: 3649 len_min = sizeof(struct ipv6hdr); 3650 break; 3651 default: 3652 return -EINVAL; 3653 } 3654 } 3655 3656 len_cur = skb->len - skb_network_offset(skb); 3657 if ((shrink && (len_diff_abs >= len_cur || 3658 len_cur - len_diff_abs < len_min)) || 3659 (!shrink && (skb->len + len_diff_abs > len_max && 3660 !skb_is_gso(skb)))) 3661 return -ENOTSUPP; 3662 3663 ret = shrink ? bpf_skb_net_shrink(skb, off, len_diff_abs, flags) : 3664 bpf_skb_net_grow(skb, off, len_diff_abs, flags); 3665 if (!ret && !(flags & BPF_F_ADJ_ROOM_NO_CSUM_RESET)) 3666 __skb_reset_checksum_unnecessary(skb); 3667 3668 bpf_compute_data_pointers(skb); 3669 return ret; 3670 } 3671 3672 static const struct bpf_func_proto bpf_skb_adjust_room_proto = { 3673 .func = bpf_skb_adjust_room, 3674 .gpl_only = false, 3675 .ret_type = RET_INTEGER, 3676 .arg1_type = ARG_PTR_TO_CTX, 3677 .arg2_type = ARG_ANYTHING, 3678 .arg3_type = ARG_ANYTHING, 3679 .arg4_type = ARG_ANYTHING, 3680 }; 3681 3682 static u32 __bpf_skb_min_len(const struct sk_buff *skb) 3683 { 3684 u32 min_len = skb_network_offset(skb); 3685 3686 if (skb_transport_header_was_set(skb)) 3687 min_len = skb_transport_offset(skb); 3688 if (skb->ip_summed == CHECKSUM_PARTIAL) 3689 min_len = skb_checksum_start_offset(skb) + 3690 skb->csum_offset + sizeof(__sum16); 3691 return min_len; 3692 } 3693 3694 static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len) 3695 { 3696 unsigned int old_len = skb->len; 3697 int ret; 3698 3699 ret = __skb_grow_rcsum(skb, new_len); 3700 if (!ret) 3701 memset(skb->data + old_len, 0, new_len - old_len); 3702 return ret; 3703 } 3704 3705 static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len) 3706 { 3707 return __skb_trim_rcsum(skb, new_len); 3708 } 3709 3710 static inline int __bpf_skb_change_tail(struct sk_buff *skb, u32 new_len, 3711 u64 flags) 3712 { 3713 u32 max_len = BPF_SKB_MAX_LEN; 3714 u32 min_len = __bpf_skb_min_len(skb); 3715 int ret; 3716 3717 if (unlikely(flags || new_len > max_len || new_len < min_len)) 3718 return -EINVAL; 3719 if (skb->encapsulation) 3720 return -ENOTSUPP; 3721 3722 /* The basic idea of this helper is that it's performing the 3723 * needed work to either grow or trim an skb, and eBPF program 3724 * rewrites the rest via helpers like bpf_skb_store_bytes(), 3725 * bpf_lX_csum_replace() and others rather than passing a raw 3726 * buffer here. This one is a slow path helper and intended 3727 * for replies with control messages. 3728 * 3729 * Like in bpf_skb_change_proto(), we want to keep this rather 3730 * minimal and without protocol specifics so that we are able 3731 * to separate concerns as in bpf_skb_store_bytes() should only 3732 * be the one responsible for writing buffers. 3733 * 3734 * It's really expected to be a slow path operation here for 3735 * control message replies, so we're implicitly linearizing, 3736 * uncloning and drop offloads from the skb by this. 3737 */ 3738 ret = __bpf_try_make_writable(skb, skb->len); 3739 if (!ret) { 3740 if (new_len > skb->len) 3741 ret = bpf_skb_grow_rcsum(skb, new_len); 3742 else if (new_len < skb->len) 3743 ret = bpf_skb_trim_rcsum(skb, new_len); 3744 if (!ret && skb_is_gso(skb)) 3745 skb_gso_reset(skb); 3746 } 3747 return ret; 3748 } 3749 3750 BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len, 3751 u64, flags) 3752 { 3753 int ret = __bpf_skb_change_tail(skb, new_len, flags); 3754 3755 bpf_compute_data_pointers(skb); 3756 return ret; 3757 } 3758 3759 static const struct bpf_func_proto bpf_skb_change_tail_proto = { 3760 .func = bpf_skb_change_tail, 3761 .gpl_only = false, 3762 .ret_type = RET_INTEGER, 3763 .arg1_type = ARG_PTR_TO_CTX, 3764 .arg2_type = ARG_ANYTHING, 3765 .arg3_type = ARG_ANYTHING, 3766 }; 3767 3768 BPF_CALL_3(sk_skb_change_tail, struct sk_buff *, skb, u32, new_len, 3769 u64, flags) 3770 { 3771 return __bpf_skb_change_tail(skb, new_len, flags); 3772 } 3773 3774 static const struct bpf_func_proto sk_skb_change_tail_proto = { 3775 .func = sk_skb_change_tail, 3776 .gpl_only = false, 3777 .ret_type = RET_INTEGER, 3778 .arg1_type = ARG_PTR_TO_CTX, 3779 .arg2_type = ARG_ANYTHING, 3780 .arg3_type = ARG_ANYTHING, 3781 }; 3782 3783 static inline int __bpf_skb_change_head(struct sk_buff *skb, u32 head_room, 3784 u64 flags) 3785 { 3786 u32 max_len = BPF_SKB_MAX_LEN; 3787 u32 new_len = skb->len + head_room; 3788 int ret; 3789 3790 if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) || 3791 new_len < skb->len)) 3792 return -EINVAL; 3793 3794 ret = skb_cow(skb, head_room); 3795 if (likely(!ret)) { 3796 /* Idea for this helper is that we currently only 3797 * allow to expand on mac header. This means that 3798 * skb->protocol network header, etc, stay as is. 3799 * Compared to bpf_skb_change_tail(), we're more 3800 * flexible due to not needing to linearize or 3801 * reset GSO. Intention for this helper is to be 3802 * used by an L3 skb that needs to push mac header 3803 * for redirection into L2 device. 3804 */ 3805 __skb_push(skb, head_room); 3806 memset(skb->data, 0, head_room); 3807 skb_reset_mac_header(skb); 3808 skb_reset_mac_len(skb); 3809 } 3810 3811 return ret; 3812 } 3813 3814 BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room, 3815 u64, flags) 3816 { 3817 int ret = __bpf_skb_change_head(skb, head_room, flags); 3818 3819 bpf_compute_data_pointers(skb); 3820 return ret; 3821 } 3822 3823 static const struct bpf_func_proto bpf_skb_change_head_proto = { 3824 .func = bpf_skb_change_head, 3825 .gpl_only = false, 3826 .ret_type = RET_INTEGER, 3827 .arg1_type = ARG_PTR_TO_CTX, 3828 .arg2_type = ARG_ANYTHING, 3829 .arg3_type = ARG_ANYTHING, 3830 }; 3831 3832 BPF_CALL_3(sk_skb_change_head, struct sk_buff *, skb, u32, head_room, 3833 u64, flags) 3834 { 3835 return __bpf_skb_change_head(skb, head_room, flags); 3836 } 3837 3838 static const struct bpf_func_proto sk_skb_change_head_proto = { 3839 .func = sk_skb_change_head, 3840 .gpl_only = false, 3841 .ret_type = RET_INTEGER, 3842 .arg1_type = ARG_PTR_TO_CTX, 3843 .arg2_type = ARG_ANYTHING, 3844 .arg3_type = ARG_ANYTHING, 3845 }; 3846 3847 BPF_CALL_1(bpf_xdp_get_buff_len, struct xdp_buff*, xdp) 3848 { 3849 return xdp_get_buff_len(xdp); 3850 } 3851 3852 static const struct bpf_func_proto bpf_xdp_get_buff_len_proto = { 3853 .func = bpf_xdp_get_buff_len, 3854 .gpl_only = false, 3855 .ret_type = RET_INTEGER, 3856 .arg1_type = ARG_PTR_TO_CTX, 3857 }; 3858 3859 BTF_ID_LIST_SINGLE(bpf_xdp_get_buff_len_bpf_ids, struct, xdp_buff) 3860 3861 const struct bpf_func_proto bpf_xdp_get_buff_len_trace_proto = { 3862 .func = bpf_xdp_get_buff_len, 3863 .gpl_only = false, 3864 .arg1_type = ARG_PTR_TO_BTF_ID, 3865 .arg1_btf_id = &bpf_xdp_get_buff_len_bpf_ids[0], 3866 }; 3867 3868 static unsigned long xdp_get_metalen(const struct xdp_buff *xdp) 3869 { 3870 return xdp_data_meta_unsupported(xdp) ? 0 : 3871 xdp->data - xdp->data_meta; 3872 } 3873 3874 BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset) 3875 { 3876 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); 3877 unsigned long metalen = xdp_get_metalen(xdp); 3878 void *data_start = xdp_frame_end + metalen; 3879 void *data = xdp->data + offset; 3880 3881 if (unlikely(data < data_start || 3882 data > xdp->data_end - ETH_HLEN)) 3883 return -EINVAL; 3884 3885 if (metalen) 3886 memmove(xdp->data_meta + offset, 3887 xdp->data_meta, metalen); 3888 xdp->data_meta += offset; 3889 xdp->data = data; 3890 3891 return 0; 3892 } 3893 3894 static const struct bpf_func_proto bpf_xdp_adjust_head_proto = { 3895 .func = bpf_xdp_adjust_head, 3896 .gpl_only = false, 3897 .ret_type = RET_INTEGER, 3898 .arg1_type = ARG_PTR_TO_CTX, 3899 .arg2_type = ARG_ANYTHING, 3900 }; 3901 3902 void bpf_xdp_copy_buf(struct xdp_buff *xdp, unsigned long off, 3903 void *buf, unsigned long len, bool flush) 3904 { 3905 unsigned long ptr_len, ptr_off = 0; 3906 skb_frag_t *next_frag, *end_frag; 3907 struct skb_shared_info *sinfo; 3908 void *src, *dst; 3909 u8 *ptr_buf; 3910 3911 if (likely(xdp->data_end - xdp->data >= off + len)) { 3912 src = flush ? buf : xdp->data + off; 3913 dst = flush ? xdp->data + off : buf; 3914 memcpy(dst, src, len); 3915 return; 3916 } 3917 3918 sinfo = xdp_get_shared_info_from_buff(xdp); 3919 end_frag = &sinfo->frags[sinfo->nr_frags]; 3920 next_frag = &sinfo->frags[0]; 3921 3922 ptr_len = xdp->data_end - xdp->data; 3923 ptr_buf = xdp->data; 3924 3925 while (true) { 3926 if (off < ptr_off + ptr_len) { 3927 unsigned long copy_off = off - ptr_off; 3928 unsigned long copy_len = min(len, ptr_len - copy_off); 3929 3930 src = flush ? buf : ptr_buf + copy_off; 3931 dst = flush ? ptr_buf + copy_off : buf; 3932 memcpy(dst, src, copy_len); 3933 3934 off += copy_len; 3935 len -= copy_len; 3936 buf += copy_len; 3937 } 3938 3939 if (!len || next_frag == end_frag) 3940 break; 3941 3942 ptr_off += ptr_len; 3943 ptr_buf = skb_frag_address(next_frag); 3944 ptr_len = skb_frag_size(next_frag); 3945 next_frag++; 3946 } 3947 } 3948 3949 void *bpf_xdp_pointer(struct xdp_buff *xdp, u32 offset, u32 len) 3950 { 3951 u32 size = xdp->data_end - xdp->data; 3952 struct skb_shared_info *sinfo; 3953 void *addr = xdp->data; 3954 int i; 3955 3956 if (unlikely(offset > 0xffff || len > 0xffff)) 3957 return ERR_PTR(-EFAULT); 3958 3959 if (unlikely(offset + len > xdp_get_buff_len(xdp))) 3960 return ERR_PTR(-EINVAL); 3961 3962 if (likely(offset < size)) /* linear area */ 3963 goto out; 3964 3965 sinfo = xdp_get_shared_info_from_buff(xdp); 3966 offset -= size; 3967 for (i = 0; i < sinfo->nr_frags; i++) { /* paged area */ 3968 u32 frag_size = skb_frag_size(&sinfo->frags[i]); 3969 3970 if (offset < frag_size) { 3971 addr = skb_frag_address(&sinfo->frags[i]); 3972 size = frag_size; 3973 break; 3974 } 3975 offset -= frag_size; 3976 } 3977 out: 3978 return offset + len <= size ? addr + offset : NULL; 3979 } 3980 3981 BPF_CALL_4(bpf_xdp_load_bytes, struct xdp_buff *, xdp, u32, offset, 3982 void *, buf, u32, len) 3983 { 3984 void *ptr; 3985 3986 ptr = bpf_xdp_pointer(xdp, offset, len); 3987 if (IS_ERR(ptr)) 3988 return PTR_ERR(ptr); 3989 3990 if (!ptr) 3991 bpf_xdp_copy_buf(xdp, offset, buf, len, false); 3992 else 3993 memcpy(buf, ptr, len); 3994 3995 return 0; 3996 } 3997 3998 static const struct bpf_func_proto bpf_xdp_load_bytes_proto = { 3999 .func = bpf_xdp_load_bytes, 4000 .gpl_only = false, 4001 .ret_type = RET_INTEGER, 4002 .arg1_type = ARG_PTR_TO_CTX, 4003 .arg2_type = ARG_ANYTHING, 4004 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 4005 .arg4_type = ARG_CONST_SIZE, 4006 }; 4007 4008 int __bpf_xdp_load_bytes(struct xdp_buff *xdp, u32 offset, void *buf, u32 len) 4009 { 4010 return ____bpf_xdp_load_bytes(xdp, offset, buf, len); 4011 } 4012 4013 BPF_CALL_4(bpf_xdp_store_bytes, struct xdp_buff *, xdp, u32, offset, 4014 void *, buf, u32, len) 4015 { 4016 void *ptr; 4017 4018 ptr = bpf_xdp_pointer(xdp, offset, len); 4019 if (IS_ERR(ptr)) 4020 return PTR_ERR(ptr); 4021 4022 if (!ptr) 4023 bpf_xdp_copy_buf(xdp, offset, buf, len, true); 4024 else 4025 memcpy(ptr, buf, len); 4026 4027 return 0; 4028 } 4029 4030 static const struct bpf_func_proto bpf_xdp_store_bytes_proto = { 4031 .func = bpf_xdp_store_bytes, 4032 .gpl_only = false, 4033 .ret_type = RET_INTEGER, 4034 .arg1_type = ARG_PTR_TO_CTX, 4035 .arg2_type = ARG_ANYTHING, 4036 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 4037 .arg4_type = ARG_CONST_SIZE, 4038 }; 4039 4040 int __bpf_xdp_store_bytes(struct xdp_buff *xdp, u32 offset, void *buf, u32 len) 4041 { 4042 return ____bpf_xdp_store_bytes(xdp, offset, buf, len); 4043 } 4044 4045 static int bpf_xdp_frags_increase_tail(struct xdp_buff *xdp, int offset) 4046 { 4047 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); 4048 skb_frag_t *frag = &sinfo->frags[sinfo->nr_frags - 1]; 4049 struct xdp_rxq_info *rxq = xdp->rxq; 4050 unsigned int tailroom; 4051 4052 if (!rxq->frag_size || rxq->frag_size > xdp->frame_sz) 4053 return -EOPNOTSUPP; 4054 4055 tailroom = rxq->frag_size - skb_frag_size(frag) - skb_frag_off(frag); 4056 if (unlikely(offset > tailroom)) 4057 return -EINVAL; 4058 4059 memset(skb_frag_address(frag) + skb_frag_size(frag), 0, offset); 4060 skb_frag_size_add(frag, offset); 4061 sinfo->xdp_frags_size += offset; 4062 4063 return 0; 4064 } 4065 4066 static int bpf_xdp_frags_shrink_tail(struct xdp_buff *xdp, int offset) 4067 { 4068 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); 4069 int i, n_frags_free = 0, len_free = 0; 4070 4071 if (unlikely(offset > (int)xdp_get_buff_len(xdp) - ETH_HLEN)) 4072 return -EINVAL; 4073 4074 for (i = sinfo->nr_frags - 1; i >= 0 && offset > 0; i--) { 4075 skb_frag_t *frag = &sinfo->frags[i]; 4076 int shrink = min_t(int, offset, skb_frag_size(frag)); 4077 4078 len_free += shrink; 4079 offset -= shrink; 4080 4081 if (skb_frag_size(frag) == shrink) { 4082 struct page *page = skb_frag_page(frag); 4083 4084 __xdp_return(page_address(page), &xdp->rxq->mem, 4085 false, NULL); 4086 n_frags_free++; 4087 } else { 4088 skb_frag_size_sub(frag, shrink); 4089 break; 4090 } 4091 } 4092 sinfo->nr_frags -= n_frags_free; 4093 sinfo->xdp_frags_size -= len_free; 4094 4095 if (unlikely(!sinfo->nr_frags)) { 4096 xdp_buff_clear_frags_flag(xdp); 4097 xdp->data_end -= offset; 4098 } 4099 4100 return 0; 4101 } 4102 4103 BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset) 4104 { 4105 void *data_hard_end = xdp_data_hard_end(xdp); /* use xdp->frame_sz */ 4106 void *data_end = xdp->data_end + offset; 4107 4108 if (unlikely(xdp_buff_has_frags(xdp))) { /* non-linear xdp buff */ 4109 if (offset < 0) 4110 return bpf_xdp_frags_shrink_tail(xdp, -offset); 4111 4112 return bpf_xdp_frags_increase_tail(xdp, offset); 4113 } 4114 4115 /* Notice that xdp_data_hard_end have reserved some tailroom */ 4116 if (unlikely(data_end > data_hard_end)) 4117 return -EINVAL; 4118 4119 /* ALL drivers MUST init xdp->frame_sz, chicken check below */ 4120 if (unlikely(xdp->frame_sz > PAGE_SIZE)) { 4121 WARN_ONCE(1, "Too BIG xdp->frame_sz = %d\n", xdp->frame_sz); 4122 return -EINVAL; 4123 } 4124 4125 if (unlikely(data_end < xdp->data + ETH_HLEN)) 4126 return -EINVAL; 4127 4128 /* Clear memory area on grow, can contain uninit kernel memory */ 4129 if (offset > 0) 4130 memset(xdp->data_end, 0, offset); 4131 4132 xdp->data_end = data_end; 4133 4134 return 0; 4135 } 4136 4137 static const struct bpf_func_proto bpf_xdp_adjust_tail_proto = { 4138 .func = bpf_xdp_adjust_tail, 4139 .gpl_only = false, 4140 .ret_type = RET_INTEGER, 4141 .arg1_type = ARG_PTR_TO_CTX, 4142 .arg2_type = ARG_ANYTHING, 4143 }; 4144 4145 BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset) 4146 { 4147 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); 4148 void *meta = xdp->data_meta + offset; 4149 unsigned long metalen = xdp->data - meta; 4150 4151 if (xdp_data_meta_unsupported(xdp)) 4152 return -ENOTSUPP; 4153 if (unlikely(meta < xdp_frame_end || 4154 meta > xdp->data)) 4155 return -EINVAL; 4156 if (unlikely(xdp_metalen_invalid(metalen))) 4157 return -EACCES; 4158 4159 xdp->data_meta = meta; 4160 4161 return 0; 4162 } 4163 4164 static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = { 4165 .func = bpf_xdp_adjust_meta, 4166 .gpl_only = false, 4167 .ret_type = RET_INTEGER, 4168 .arg1_type = ARG_PTR_TO_CTX, 4169 .arg2_type = ARG_ANYTHING, 4170 }; 4171 4172 /** 4173 * DOC: xdp redirect 4174 * 4175 * XDP_REDIRECT works by a three-step process, implemented in the functions 4176 * below: 4177 * 4178 * 1. The bpf_redirect() and bpf_redirect_map() helpers will lookup the target 4179 * of the redirect and store it (along with some other metadata) in a per-CPU 4180 * struct bpf_redirect_info. 4181 * 4182 * 2. When the program returns the XDP_REDIRECT return code, the driver will 4183 * call xdp_do_redirect() which will use the information in struct 4184 * bpf_redirect_info to actually enqueue the frame into a map type-specific 4185 * bulk queue structure. 4186 * 4187 * 3. Before exiting its NAPI poll loop, the driver will call 4188 * xdp_do_flush(), which will flush all the different bulk queues, 4189 * thus completing the redirect. Note that xdp_do_flush() must be 4190 * called before napi_complete_done() in the driver, as the 4191 * XDP_REDIRECT logic relies on being inside a single NAPI instance 4192 * through to the xdp_do_flush() call for RCU protection of all 4193 * in-kernel data structures. 4194 */ 4195 /* 4196 * Pointers to the map entries will be kept around for this whole sequence of 4197 * steps, protected by RCU. However, there is no top-level rcu_read_lock() in 4198 * the core code; instead, the RCU protection relies on everything happening 4199 * inside a single NAPI poll sequence, which means it's between a pair of calls 4200 * to local_bh_disable()/local_bh_enable(). 4201 * 4202 * The map entries are marked as __rcu and the map code makes sure to 4203 * dereference those pointers with rcu_dereference_check() in a way that works 4204 * for both sections that to hold an rcu_read_lock() and sections that are 4205 * called from NAPI without a separate rcu_read_lock(). The code below does not 4206 * use RCU annotations, but relies on those in the map code. 4207 */ 4208 void xdp_do_flush(void) 4209 { 4210 __dev_flush(); 4211 __cpu_map_flush(); 4212 __xsk_map_flush(); 4213 } 4214 EXPORT_SYMBOL_GPL(xdp_do_flush); 4215 4216 void bpf_clear_redirect_map(struct bpf_map *map) 4217 { 4218 struct bpf_redirect_info *ri; 4219 int cpu; 4220 4221 for_each_possible_cpu(cpu) { 4222 ri = per_cpu_ptr(&bpf_redirect_info, cpu); 4223 /* Avoid polluting remote cacheline due to writes if 4224 * not needed. Once we pass this test, we need the 4225 * cmpxchg() to make sure it hasn't been changed in 4226 * the meantime by remote CPU. 4227 */ 4228 if (unlikely(READ_ONCE(ri->map) == map)) 4229 cmpxchg(&ri->map, map, NULL); 4230 } 4231 } 4232 4233 DEFINE_STATIC_KEY_FALSE(bpf_master_redirect_enabled_key); 4234 EXPORT_SYMBOL_GPL(bpf_master_redirect_enabled_key); 4235 4236 u32 xdp_master_redirect(struct xdp_buff *xdp) 4237 { 4238 struct net_device *master, *slave; 4239 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4240 4241 master = netdev_master_upper_dev_get_rcu(xdp->rxq->dev); 4242 slave = master->netdev_ops->ndo_xdp_get_xmit_slave(master, xdp); 4243 if (slave && slave != xdp->rxq->dev) { 4244 /* The target device is different from the receiving device, so 4245 * redirect it to the new device. 4246 * Using XDP_REDIRECT gets the correct behaviour from XDP enabled 4247 * drivers to unmap the packet from their rx ring. 4248 */ 4249 ri->tgt_index = slave->ifindex; 4250 ri->map_id = INT_MAX; 4251 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4252 return XDP_REDIRECT; 4253 } 4254 return XDP_TX; 4255 } 4256 EXPORT_SYMBOL_GPL(xdp_master_redirect); 4257 4258 static inline int __xdp_do_redirect_xsk(struct bpf_redirect_info *ri, 4259 struct net_device *dev, 4260 struct xdp_buff *xdp, 4261 struct bpf_prog *xdp_prog) 4262 { 4263 enum bpf_map_type map_type = ri->map_type; 4264 void *fwd = ri->tgt_value; 4265 u32 map_id = ri->map_id; 4266 int err; 4267 4268 ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */ 4269 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4270 4271 err = __xsk_map_redirect(fwd, xdp); 4272 if (unlikely(err)) 4273 goto err; 4274 4275 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index); 4276 return 0; 4277 err: 4278 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index, err); 4279 return err; 4280 } 4281 4282 static __always_inline int __xdp_do_redirect_frame(struct bpf_redirect_info *ri, 4283 struct net_device *dev, 4284 struct xdp_frame *xdpf, 4285 struct bpf_prog *xdp_prog) 4286 { 4287 enum bpf_map_type map_type = ri->map_type; 4288 void *fwd = ri->tgt_value; 4289 u32 map_id = ri->map_id; 4290 struct bpf_map *map; 4291 int err; 4292 4293 ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */ 4294 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4295 4296 if (unlikely(!xdpf)) { 4297 err = -EOVERFLOW; 4298 goto err; 4299 } 4300 4301 switch (map_type) { 4302 case BPF_MAP_TYPE_DEVMAP: 4303 fallthrough; 4304 case BPF_MAP_TYPE_DEVMAP_HASH: 4305 map = READ_ONCE(ri->map); 4306 if (unlikely(map)) { 4307 WRITE_ONCE(ri->map, NULL); 4308 err = dev_map_enqueue_multi(xdpf, dev, map, 4309 ri->flags & BPF_F_EXCLUDE_INGRESS); 4310 } else { 4311 err = dev_map_enqueue(fwd, xdpf, dev); 4312 } 4313 break; 4314 case BPF_MAP_TYPE_CPUMAP: 4315 err = cpu_map_enqueue(fwd, xdpf, dev); 4316 break; 4317 case BPF_MAP_TYPE_UNSPEC: 4318 if (map_id == INT_MAX) { 4319 fwd = dev_get_by_index_rcu(dev_net(dev), ri->tgt_index); 4320 if (unlikely(!fwd)) { 4321 err = -EINVAL; 4322 break; 4323 } 4324 err = dev_xdp_enqueue(fwd, xdpf, dev); 4325 break; 4326 } 4327 fallthrough; 4328 default: 4329 err = -EBADRQC; 4330 } 4331 4332 if (unlikely(err)) 4333 goto err; 4334 4335 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index); 4336 return 0; 4337 err: 4338 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index, err); 4339 return err; 4340 } 4341 4342 int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp, 4343 struct bpf_prog *xdp_prog) 4344 { 4345 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4346 enum bpf_map_type map_type = ri->map_type; 4347 4348 if (map_type == BPF_MAP_TYPE_XSKMAP) { 4349 /* XDP_REDIRECT is not supported AF_XDP yet. */ 4350 if (unlikely(xdp_buff_has_frags(xdp))) 4351 return -EOPNOTSUPP; 4352 4353 return __xdp_do_redirect_xsk(ri, dev, xdp, xdp_prog); 4354 } 4355 4356 return __xdp_do_redirect_frame(ri, dev, xdp_convert_buff_to_frame(xdp), 4357 xdp_prog); 4358 } 4359 EXPORT_SYMBOL_GPL(xdp_do_redirect); 4360 4361 int xdp_do_redirect_frame(struct net_device *dev, struct xdp_buff *xdp, 4362 struct xdp_frame *xdpf, struct bpf_prog *xdp_prog) 4363 { 4364 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4365 enum bpf_map_type map_type = ri->map_type; 4366 4367 if (map_type == BPF_MAP_TYPE_XSKMAP) 4368 return __xdp_do_redirect_xsk(ri, dev, xdp, xdp_prog); 4369 4370 return __xdp_do_redirect_frame(ri, dev, xdpf, xdp_prog); 4371 } 4372 EXPORT_SYMBOL_GPL(xdp_do_redirect_frame); 4373 4374 static int xdp_do_generic_redirect_map(struct net_device *dev, 4375 struct sk_buff *skb, 4376 struct xdp_buff *xdp, 4377 struct bpf_prog *xdp_prog, 4378 void *fwd, 4379 enum bpf_map_type map_type, u32 map_id) 4380 { 4381 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4382 struct bpf_map *map; 4383 int err; 4384 4385 switch (map_type) { 4386 case BPF_MAP_TYPE_DEVMAP: 4387 fallthrough; 4388 case BPF_MAP_TYPE_DEVMAP_HASH: 4389 map = READ_ONCE(ri->map); 4390 if (unlikely(map)) { 4391 WRITE_ONCE(ri->map, NULL); 4392 err = dev_map_redirect_multi(dev, skb, xdp_prog, map, 4393 ri->flags & BPF_F_EXCLUDE_INGRESS); 4394 } else { 4395 err = dev_map_generic_redirect(fwd, skb, xdp_prog); 4396 } 4397 if (unlikely(err)) 4398 goto err; 4399 break; 4400 case BPF_MAP_TYPE_XSKMAP: 4401 err = xsk_generic_rcv(fwd, xdp); 4402 if (err) 4403 goto err; 4404 consume_skb(skb); 4405 break; 4406 case BPF_MAP_TYPE_CPUMAP: 4407 err = cpu_map_generic_redirect(fwd, skb); 4408 if (unlikely(err)) 4409 goto err; 4410 break; 4411 default: 4412 err = -EBADRQC; 4413 goto err; 4414 } 4415 4416 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index); 4417 return 0; 4418 err: 4419 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index, err); 4420 return err; 4421 } 4422 4423 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb, 4424 struct xdp_buff *xdp, struct bpf_prog *xdp_prog) 4425 { 4426 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4427 enum bpf_map_type map_type = ri->map_type; 4428 void *fwd = ri->tgt_value; 4429 u32 map_id = ri->map_id; 4430 int err; 4431 4432 ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */ 4433 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4434 4435 if (map_type == BPF_MAP_TYPE_UNSPEC && map_id == INT_MAX) { 4436 fwd = dev_get_by_index_rcu(dev_net(dev), ri->tgt_index); 4437 if (unlikely(!fwd)) { 4438 err = -EINVAL; 4439 goto err; 4440 } 4441 4442 err = xdp_ok_fwd_dev(fwd, skb->len); 4443 if (unlikely(err)) 4444 goto err; 4445 4446 skb->dev = fwd; 4447 _trace_xdp_redirect(dev, xdp_prog, ri->tgt_index); 4448 generic_xdp_tx(skb, xdp_prog); 4449 return 0; 4450 } 4451 4452 return xdp_do_generic_redirect_map(dev, skb, xdp, xdp_prog, fwd, map_type, map_id); 4453 err: 4454 _trace_xdp_redirect_err(dev, xdp_prog, ri->tgt_index, err); 4455 return err; 4456 } 4457 4458 BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags) 4459 { 4460 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4461 4462 if (unlikely(flags)) 4463 return XDP_ABORTED; 4464 4465 /* NB! Map type UNSPEC and map_id == INT_MAX (never generated 4466 * by map_idr) is used for ifindex based XDP redirect. 4467 */ 4468 ri->tgt_index = ifindex; 4469 ri->map_id = INT_MAX; 4470 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4471 4472 return XDP_REDIRECT; 4473 } 4474 4475 static const struct bpf_func_proto bpf_xdp_redirect_proto = { 4476 .func = bpf_xdp_redirect, 4477 .gpl_only = false, 4478 .ret_type = RET_INTEGER, 4479 .arg1_type = ARG_ANYTHING, 4480 .arg2_type = ARG_ANYTHING, 4481 }; 4482 4483 BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u64, key, 4484 u64, flags) 4485 { 4486 return map->ops->map_redirect(map, key, flags); 4487 } 4488 4489 static const struct bpf_func_proto bpf_xdp_redirect_map_proto = { 4490 .func = bpf_xdp_redirect_map, 4491 .gpl_only = false, 4492 .ret_type = RET_INTEGER, 4493 .arg1_type = ARG_CONST_MAP_PTR, 4494 .arg2_type = ARG_ANYTHING, 4495 .arg3_type = ARG_ANYTHING, 4496 }; 4497 4498 static unsigned long bpf_skb_copy(void *dst_buff, const void *skb, 4499 unsigned long off, unsigned long len) 4500 { 4501 void *ptr = skb_header_pointer(skb, off, len, dst_buff); 4502 4503 if (unlikely(!ptr)) 4504 return len; 4505 if (ptr != dst_buff) 4506 memcpy(dst_buff, ptr, len); 4507 4508 return 0; 4509 } 4510 4511 BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map, 4512 u64, flags, void *, meta, u64, meta_size) 4513 { 4514 u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32; 4515 4516 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) 4517 return -EINVAL; 4518 if (unlikely(!skb || skb_size > skb->len)) 4519 return -EFAULT; 4520 4521 return bpf_event_output(map, flags, meta, meta_size, skb, skb_size, 4522 bpf_skb_copy); 4523 } 4524 4525 static const struct bpf_func_proto bpf_skb_event_output_proto = { 4526 .func = bpf_skb_event_output, 4527 .gpl_only = true, 4528 .ret_type = RET_INTEGER, 4529 .arg1_type = ARG_PTR_TO_CTX, 4530 .arg2_type = ARG_CONST_MAP_PTR, 4531 .arg3_type = ARG_ANYTHING, 4532 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4533 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4534 }; 4535 4536 BTF_ID_LIST_SINGLE(bpf_skb_output_btf_ids, struct, sk_buff) 4537 4538 const struct bpf_func_proto bpf_skb_output_proto = { 4539 .func = bpf_skb_event_output, 4540 .gpl_only = true, 4541 .ret_type = RET_INTEGER, 4542 .arg1_type = ARG_PTR_TO_BTF_ID, 4543 .arg1_btf_id = &bpf_skb_output_btf_ids[0], 4544 .arg2_type = ARG_CONST_MAP_PTR, 4545 .arg3_type = ARG_ANYTHING, 4546 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4547 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4548 }; 4549 4550 static unsigned short bpf_tunnel_key_af(u64 flags) 4551 { 4552 return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET; 4553 } 4554 4555 BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to, 4556 u32, size, u64, flags) 4557 { 4558 const struct ip_tunnel_info *info = skb_tunnel_info(skb); 4559 u8 compat[sizeof(struct bpf_tunnel_key)]; 4560 void *to_orig = to; 4561 int err; 4562 4563 if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6 | 4564 BPF_F_TUNINFO_FLAGS)))) { 4565 err = -EINVAL; 4566 goto err_clear; 4567 } 4568 if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) { 4569 err = -EPROTO; 4570 goto err_clear; 4571 } 4572 if (unlikely(size != sizeof(struct bpf_tunnel_key))) { 4573 err = -EINVAL; 4574 switch (size) { 4575 case offsetof(struct bpf_tunnel_key, local_ipv6[0]): 4576 case offsetof(struct bpf_tunnel_key, tunnel_label): 4577 case offsetof(struct bpf_tunnel_key, tunnel_ext): 4578 goto set_compat; 4579 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): 4580 /* Fixup deprecated structure layouts here, so we have 4581 * a common path later on. 4582 */ 4583 if (ip_tunnel_info_af(info) != AF_INET) 4584 goto err_clear; 4585 set_compat: 4586 to = (struct bpf_tunnel_key *)compat; 4587 break; 4588 default: 4589 goto err_clear; 4590 } 4591 } 4592 4593 to->tunnel_id = be64_to_cpu(info->key.tun_id); 4594 to->tunnel_tos = info->key.tos; 4595 to->tunnel_ttl = info->key.ttl; 4596 if (flags & BPF_F_TUNINFO_FLAGS) 4597 to->tunnel_flags = info->key.tun_flags; 4598 else 4599 to->tunnel_ext = 0; 4600 4601 if (flags & BPF_F_TUNINFO_IPV6) { 4602 memcpy(to->remote_ipv6, &info->key.u.ipv6.src, 4603 sizeof(to->remote_ipv6)); 4604 memcpy(to->local_ipv6, &info->key.u.ipv6.dst, 4605 sizeof(to->local_ipv6)); 4606 to->tunnel_label = be32_to_cpu(info->key.label); 4607 } else { 4608 to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src); 4609 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); 4610 to->local_ipv4 = be32_to_cpu(info->key.u.ipv4.dst); 4611 memset(&to->local_ipv6[1], 0, sizeof(__u32) * 3); 4612 to->tunnel_label = 0; 4613 } 4614 4615 if (unlikely(size != sizeof(struct bpf_tunnel_key))) 4616 memcpy(to_orig, to, size); 4617 4618 return 0; 4619 err_clear: 4620 memset(to_orig, 0, size); 4621 return err; 4622 } 4623 4624 static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = { 4625 .func = bpf_skb_get_tunnel_key, 4626 .gpl_only = false, 4627 .ret_type = RET_INTEGER, 4628 .arg1_type = ARG_PTR_TO_CTX, 4629 .arg2_type = ARG_PTR_TO_UNINIT_MEM, 4630 .arg3_type = ARG_CONST_SIZE, 4631 .arg4_type = ARG_ANYTHING, 4632 }; 4633 4634 BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size) 4635 { 4636 const struct ip_tunnel_info *info = skb_tunnel_info(skb); 4637 int err; 4638 4639 if (unlikely(!info || 4640 !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) { 4641 err = -ENOENT; 4642 goto err_clear; 4643 } 4644 if (unlikely(size < info->options_len)) { 4645 err = -ENOMEM; 4646 goto err_clear; 4647 } 4648 4649 ip_tunnel_info_opts_get(to, info); 4650 if (size > info->options_len) 4651 memset(to + info->options_len, 0, size - info->options_len); 4652 4653 return info->options_len; 4654 err_clear: 4655 memset(to, 0, size); 4656 return err; 4657 } 4658 4659 static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = { 4660 .func = bpf_skb_get_tunnel_opt, 4661 .gpl_only = false, 4662 .ret_type = RET_INTEGER, 4663 .arg1_type = ARG_PTR_TO_CTX, 4664 .arg2_type = ARG_PTR_TO_UNINIT_MEM, 4665 .arg3_type = ARG_CONST_SIZE, 4666 }; 4667 4668 static struct metadata_dst __percpu *md_dst; 4669 4670 BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb, 4671 const struct bpf_tunnel_key *, from, u32, size, u64, flags) 4672 { 4673 struct metadata_dst *md = this_cpu_ptr(md_dst); 4674 u8 compat[sizeof(struct bpf_tunnel_key)]; 4675 struct ip_tunnel_info *info; 4676 4677 if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX | 4678 BPF_F_DONT_FRAGMENT | BPF_F_SEQ_NUMBER | 4679 BPF_F_NO_TUNNEL_KEY))) 4680 return -EINVAL; 4681 if (unlikely(size != sizeof(struct bpf_tunnel_key))) { 4682 switch (size) { 4683 case offsetof(struct bpf_tunnel_key, local_ipv6[0]): 4684 case offsetof(struct bpf_tunnel_key, tunnel_label): 4685 case offsetof(struct bpf_tunnel_key, tunnel_ext): 4686 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): 4687 /* Fixup deprecated structure layouts here, so we have 4688 * a common path later on. 4689 */ 4690 memcpy(compat, from, size); 4691 memset(compat + size, 0, sizeof(compat) - size); 4692 from = (const struct bpf_tunnel_key *) compat; 4693 break; 4694 default: 4695 return -EINVAL; 4696 } 4697 } 4698 if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) || 4699 from->tunnel_ext)) 4700 return -EINVAL; 4701 4702 skb_dst_drop(skb); 4703 dst_hold((struct dst_entry *) md); 4704 skb_dst_set(skb, (struct dst_entry *) md); 4705 4706 info = &md->u.tun_info; 4707 memset(info, 0, sizeof(*info)); 4708 info->mode = IP_TUNNEL_INFO_TX; 4709 4710 info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE; 4711 if (flags & BPF_F_DONT_FRAGMENT) 4712 info->key.tun_flags |= TUNNEL_DONT_FRAGMENT; 4713 if (flags & BPF_F_ZERO_CSUM_TX) 4714 info->key.tun_flags &= ~TUNNEL_CSUM; 4715 if (flags & BPF_F_SEQ_NUMBER) 4716 info->key.tun_flags |= TUNNEL_SEQ; 4717 if (flags & BPF_F_NO_TUNNEL_KEY) 4718 info->key.tun_flags &= ~TUNNEL_KEY; 4719 4720 info->key.tun_id = cpu_to_be64(from->tunnel_id); 4721 info->key.tos = from->tunnel_tos; 4722 info->key.ttl = from->tunnel_ttl; 4723 4724 if (flags & BPF_F_TUNINFO_IPV6) { 4725 info->mode |= IP_TUNNEL_INFO_IPV6; 4726 memcpy(&info->key.u.ipv6.dst, from->remote_ipv6, 4727 sizeof(from->remote_ipv6)); 4728 memcpy(&info->key.u.ipv6.src, from->local_ipv6, 4729 sizeof(from->local_ipv6)); 4730 info->key.label = cpu_to_be32(from->tunnel_label) & 4731 IPV6_FLOWLABEL_MASK; 4732 } else { 4733 info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4); 4734 info->key.u.ipv4.src = cpu_to_be32(from->local_ipv4); 4735 info->key.flow_flags = FLOWI_FLAG_ANYSRC; 4736 } 4737 4738 return 0; 4739 } 4740 4741 static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = { 4742 .func = bpf_skb_set_tunnel_key, 4743 .gpl_only = false, 4744 .ret_type = RET_INTEGER, 4745 .arg1_type = ARG_PTR_TO_CTX, 4746 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4747 .arg3_type = ARG_CONST_SIZE, 4748 .arg4_type = ARG_ANYTHING, 4749 }; 4750 4751 BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb, 4752 const u8 *, from, u32, size) 4753 { 4754 struct ip_tunnel_info *info = skb_tunnel_info(skb); 4755 const struct metadata_dst *md = this_cpu_ptr(md_dst); 4756 4757 if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1)))) 4758 return -EINVAL; 4759 if (unlikely(size > IP_TUNNEL_OPTS_MAX)) 4760 return -ENOMEM; 4761 4762 ip_tunnel_info_opts_set(info, from, size, TUNNEL_OPTIONS_PRESENT); 4763 4764 return 0; 4765 } 4766 4767 static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = { 4768 .func = bpf_skb_set_tunnel_opt, 4769 .gpl_only = false, 4770 .ret_type = RET_INTEGER, 4771 .arg1_type = ARG_PTR_TO_CTX, 4772 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4773 .arg3_type = ARG_CONST_SIZE, 4774 }; 4775 4776 static const struct bpf_func_proto * 4777 bpf_get_skb_set_tunnel_proto(enum bpf_func_id which) 4778 { 4779 if (!md_dst) { 4780 struct metadata_dst __percpu *tmp; 4781 4782 tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX, 4783 METADATA_IP_TUNNEL, 4784 GFP_KERNEL); 4785 if (!tmp) 4786 return NULL; 4787 if (cmpxchg(&md_dst, NULL, tmp)) 4788 metadata_dst_free_percpu(tmp); 4789 } 4790 4791 switch (which) { 4792 case BPF_FUNC_skb_set_tunnel_key: 4793 return &bpf_skb_set_tunnel_key_proto; 4794 case BPF_FUNC_skb_set_tunnel_opt: 4795 return &bpf_skb_set_tunnel_opt_proto; 4796 default: 4797 return NULL; 4798 } 4799 } 4800 4801 BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map, 4802 u32, idx) 4803 { 4804 struct bpf_array *array = container_of(map, struct bpf_array, map); 4805 struct cgroup *cgrp; 4806 struct sock *sk; 4807 4808 sk = skb_to_full_sk(skb); 4809 if (!sk || !sk_fullsock(sk)) 4810 return -ENOENT; 4811 if (unlikely(idx >= array->map.max_entries)) 4812 return -E2BIG; 4813 4814 cgrp = READ_ONCE(array->ptrs[idx]); 4815 if (unlikely(!cgrp)) 4816 return -EAGAIN; 4817 4818 return sk_under_cgroup_hierarchy(sk, cgrp); 4819 } 4820 4821 static const struct bpf_func_proto bpf_skb_under_cgroup_proto = { 4822 .func = bpf_skb_under_cgroup, 4823 .gpl_only = false, 4824 .ret_type = RET_INTEGER, 4825 .arg1_type = ARG_PTR_TO_CTX, 4826 .arg2_type = ARG_CONST_MAP_PTR, 4827 .arg3_type = ARG_ANYTHING, 4828 }; 4829 4830 #ifdef CONFIG_SOCK_CGROUP_DATA 4831 static inline u64 __bpf_sk_cgroup_id(struct sock *sk) 4832 { 4833 struct cgroup *cgrp; 4834 4835 sk = sk_to_full_sk(sk); 4836 if (!sk || !sk_fullsock(sk)) 4837 return 0; 4838 4839 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); 4840 return cgroup_id(cgrp); 4841 } 4842 4843 BPF_CALL_1(bpf_skb_cgroup_id, const struct sk_buff *, skb) 4844 { 4845 return __bpf_sk_cgroup_id(skb->sk); 4846 } 4847 4848 static const struct bpf_func_proto bpf_skb_cgroup_id_proto = { 4849 .func = bpf_skb_cgroup_id, 4850 .gpl_only = false, 4851 .ret_type = RET_INTEGER, 4852 .arg1_type = ARG_PTR_TO_CTX, 4853 }; 4854 4855 static inline u64 __bpf_sk_ancestor_cgroup_id(struct sock *sk, 4856 int ancestor_level) 4857 { 4858 struct cgroup *ancestor; 4859 struct cgroup *cgrp; 4860 4861 sk = sk_to_full_sk(sk); 4862 if (!sk || !sk_fullsock(sk)) 4863 return 0; 4864 4865 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); 4866 ancestor = cgroup_ancestor(cgrp, ancestor_level); 4867 if (!ancestor) 4868 return 0; 4869 4870 return cgroup_id(ancestor); 4871 } 4872 4873 BPF_CALL_2(bpf_skb_ancestor_cgroup_id, const struct sk_buff *, skb, int, 4874 ancestor_level) 4875 { 4876 return __bpf_sk_ancestor_cgroup_id(skb->sk, ancestor_level); 4877 } 4878 4879 static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto = { 4880 .func = bpf_skb_ancestor_cgroup_id, 4881 .gpl_only = false, 4882 .ret_type = RET_INTEGER, 4883 .arg1_type = ARG_PTR_TO_CTX, 4884 .arg2_type = ARG_ANYTHING, 4885 }; 4886 4887 BPF_CALL_1(bpf_sk_cgroup_id, struct sock *, sk) 4888 { 4889 return __bpf_sk_cgroup_id(sk); 4890 } 4891 4892 static const struct bpf_func_proto bpf_sk_cgroup_id_proto = { 4893 .func = bpf_sk_cgroup_id, 4894 .gpl_only = false, 4895 .ret_type = RET_INTEGER, 4896 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 4897 }; 4898 4899 BPF_CALL_2(bpf_sk_ancestor_cgroup_id, struct sock *, sk, int, ancestor_level) 4900 { 4901 return __bpf_sk_ancestor_cgroup_id(sk, ancestor_level); 4902 } 4903 4904 static const struct bpf_func_proto bpf_sk_ancestor_cgroup_id_proto = { 4905 .func = bpf_sk_ancestor_cgroup_id, 4906 .gpl_only = false, 4907 .ret_type = RET_INTEGER, 4908 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 4909 .arg2_type = ARG_ANYTHING, 4910 }; 4911 #endif 4912 4913 static unsigned long bpf_xdp_copy(void *dst, const void *ctx, 4914 unsigned long off, unsigned long len) 4915 { 4916 struct xdp_buff *xdp = (struct xdp_buff *)ctx; 4917 4918 bpf_xdp_copy_buf(xdp, off, dst, len, false); 4919 return 0; 4920 } 4921 4922 BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map, 4923 u64, flags, void *, meta, u64, meta_size) 4924 { 4925 u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32; 4926 4927 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) 4928 return -EINVAL; 4929 4930 if (unlikely(!xdp || xdp_size > xdp_get_buff_len(xdp))) 4931 return -EFAULT; 4932 4933 return bpf_event_output(map, flags, meta, meta_size, xdp, 4934 xdp_size, bpf_xdp_copy); 4935 } 4936 4937 static const struct bpf_func_proto bpf_xdp_event_output_proto = { 4938 .func = bpf_xdp_event_output, 4939 .gpl_only = true, 4940 .ret_type = RET_INTEGER, 4941 .arg1_type = ARG_PTR_TO_CTX, 4942 .arg2_type = ARG_CONST_MAP_PTR, 4943 .arg3_type = ARG_ANYTHING, 4944 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4945 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4946 }; 4947 4948 BTF_ID_LIST_SINGLE(bpf_xdp_output_btf_ids, struct, xdp_buff) 4949 4950 const struct bpf_func_proto bpf_xdp_output_proto = { 4951 .func = bpf_xdp_event_output, 4952 .gpl_only = true, 4953 .ret_type = RET_INTEGER, 4954 .arg1_type = ARG_PTR_TO_BTF_ID, 4955 .arg1_btf_id = &bpf_xdp_output_btf_ids[0], 4956 .arg2_type = ARG_CONST_MAP_PTR, 4957 .arg3_type = ARG_ANYTHING, 4958 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4959 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4960 }; 4961 4962 BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb) 4963 { 4964 return skb->sk ? __sock_gen_cookie(skb->sk) : 0; 4965 } 4966 4967 static const struct bpf_func_proto bpf_get_socket_cookie_proto = { 4968 .func = bpf_get_socket_cookie, 4969 .gpl_only = false, 4970 .ret_type = RET_INTEGER, 4971 .arg1_type = ARG_PTR_TO_CTX, 4972 }; 4973 4974 BPF_CALL_1(bpf_get_socket_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx) 4975 { 4976 return __sock_gen_cookie(ctx->sk); 4977 } 4978 4979 static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto = { 4980 .func = bpf_get_socket_cookie_sock_addr, 4981 .gpl_only = false, 4982 .ret_type = RET_INTEGER, 4983 .arg1_type = ARG_PTR_TO_CTX, 4984 }; 4985 4986 BPF_CALL_1(bpf_get_socket_cookie_sock, struct sock *, ctx) 4987 { 4988 return __sock_gen_cookie(ctx); 4989 } 4990 4991 static const struct bpf_func_proto bpf_get_socket_cookie_sock_proto = { 4992 .func = bpf_get_socket_cookie_sock, 4993 .gpl_only = false, 4994 .ret_type = RET_INTEGER, 4995 .arg1_type = ARG_PTR_TO_CTX, 4996 }; 4997 4998 BPF_CALL_1(bpf_get_socket_ptr_cookie, struct sock *, sk) 4999 { 5000 return sk ? sock_gen_cookie(sk) : 0; 5001 } 5002 5003 const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto = { 5004 .func = bpf_get_socket_ptr_cookie, 5005 .gpl_only = false, 5006 .ret_type = RET_INTEGER, 5007 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON | PTR_MAYBE_NULL, 5008 }; 5009 5010 BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx) 5011 { 5012 return __sock_gen_cookie(ctx->sk); 5013 } 5014 5015 static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto = { 5016 .func = bpf_get_socket_cookie_sock_ops, 5017 .gpl_only = false, 5018 .ret_type = RET_INTEGER, 5019 .arg1_type = ARG_PTR_TO_CTX, 5020 }; 5021 5022 static u64 __bpf_get_netns_cookie(struct sock *sk) 5023 { 5024 const struct net *net = sk ? sock_net(sk) : &init_net; 5025 5026 return net->net_cookie; 5027 } 5028 5029 BPF_CALL_1(bpf_get_netns_cookie_sock, struct sock *, ctx) 5030 { 5031 return __bpf_get_netns_cookie(ctx); 5032 } 5033 5034 static const struct bpf_func_proto bpf_get_netns_cookie_sock_proto = { 5035 .func = bpf_get_netns_cookie_sock, 5036 .gpl_only = false, 5037 .ret_type = RET_INTEGER, 5038 .arg1_type = ARG_PTR_TO_CTX_OR_NULL, 5039 }; 5040 5041 BPF_CALL_1(bpf_get_netns_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx) 5042 { 5043 return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL); 5044 } 5045 5046 static const struct bpf_func_proto bpf_get_netns_cookie_sock_addr_proto = { 5047 .func = bpf_get_netns_cookie_sock_addr, 5048 .gpl_only = false, 5049 .ret_type = RET_INTEGER, 5050 .arg1_type = ARG_PTR_TO_CTX_OR_NULL, 5051 }; 5052 5053 BPF_CALL_1(bpf_get_netns_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx) 5054 { 5055 return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL); 5056 } 5057 5058 static const struct bpf_func_proto bpf_get_netns_cookie_sock_ops_proto = { 5059 .func = bpf_get_netns_cookie_sock_ops, 5060 .gpl_only = false, 5061 .ret_type = RET_INTEGER, 5062 .arg1_type = ARG_PTR_TO_CTX_OR_NULL, 5063 }; 5064 5065 BPF_CALL_1(bpf_get_netns_cookie_sk_msg, struct sk_msg *, ctx) 5066 { 5067 return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL); 5068 } 5069 5070 static const struct bpf_func_proto bpf_get_netns_cookie_sk_msg_proto = { 5071 .func = bpf_get_netns_cookie_sk_msg, 5072 .gpl_only = false, 5073 .ret_type = RET_INTEGER, 5074 .arg1_type = ARG_PTR_TO_CTX_OR_NULL, 5075 }; 5076 5077 BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb) 5078 { 5079 struct sock *sk = sk_to_full_sk(skb->sk); 5080 kuid_t kuid; 5081 5082 if (!sk || !sk_fullsock(sk)) 5083 return overflowuid; 5084 kuid = sock_net_uid(sock_net(sk), sk); 5085 return from_kuid_munged(sock_net(sk)->user_ns, kuid); 5086 } 5087 5088 static const struct bpf_func_proto bpf_get_socket_uid_proto = { 5089 .func = bpf_get_socket_uid, 5090 .gpl_only = false, 5091 .ret_type = RET_INTEGER, 5092 .arg1_type = ARG_PTR_TO_CTX, 5093 }; 5094 5095 static int sol_socket_sockopt(struct sock *sk, int optname, 5096 char *optval, int *optlen, 5097 bool getopt) 5098 { 5099 switch (optname) { 5100 case SO_REUSEADDR: 5101 case SO_SNDBUF: 5102 case SO_RCVBUF: 5103 case SO_KEEPALIVE: 5104 case SO_PRIORITY: 5105 case SO_REUSEPORT: 5106 case SO_RCVLOWAT: 5107 case SO_MARK: 5108 case SO_MAX_PACING_RATE: 5109 case SO_BINDTOIFINDEX: 5110 case SO_TXREHASH: 5111 if (*optlen != sizeof(int)) 5112 return -EINVAL; 5113 break; 5114 case SO_BINDTODEVICE: 5115 break; 5116 default: 5117 return -EINVAL; 5118 } 5119 5120 if (getopt) { 5121 if (optname == SO_BINDTODEVICE) 5122 return -EINVAL; 5123 return sk_getsockopt(sk, SOL_SOCKET, optname, 5124 KERNEL_SOCKPTR(optval), 5125 KERNEL_SOCKPTR(optlen)); 5126 } 5127 5128 return sk_setsockopt(sk, SOL_SOCKET, optname, 5129 KERNEL_SOCKPTR(optval), *optlen); 5130 } 5131 5132 static int bpf_sol_tcp_setsockopt(struct sock *sk, int optname, 5133 char *optval, int optlen) 5134 { 5135 struct tcp_sock *tp = tcp_sk(sk); 5136 unsigned long timeout; 5137 int val; 5138 5139 if (optlen != sizeof(int)) 5140 return -EINVAL; 5141 5142 val = *(int *)optval; 5143 5144 /* Only some options are supported */ 5145 switch (optname) { 5146 case TCP_BPF_IW: 5147 if (val <= 0 || tp->data_segs_out > tp->syn_data) 5148 return -EINVAL; 5149 tcp_snd_cwnd_set(tp, val); 5150 break; 5151 case TCP_BPF_SNDCWND_CLAMP: 5152 if (val <= 0) 5153 return -EINVAL; 5154 tp->snd_cwnd_clamp = val; 5155 tp->snd_ssthresh = val; 5156 break; 5157 case TCP_BPF_DELACK_MAX: 5158 timeout = usecs_to_jiffies(val); 5159 if (timeout > TCP_DELACK_MAX || 5160 timeout < TCP_TIMEOUT_MIN) 5161 return -EINVAL; 5162 inet_csk(sk)->icsk_delack_max = timeout; 5163 break; 5164 case TCP_BPF_RTO_MIN: 5165 timeout = usecs_to_jiffies(val); 5166 if (timeout > TCP_RTO_MIN || 5167 timeout < TCP_TIMEOUT_MIN) 5168 return -EINVAL; 5169 inet_csk(sk)->icsk_rto_min = timeout; 5170 break; 5171 default: 5172 return -EINVAL; 5173 } 5174 5175 return 0; 5176 } 5177 5178 static int sol_tcp_sockopt_congestion(struct sock *sk, char *optval, 5179 int *optlen, bool getopt) 5180 { 5181 struct tcp_sock *tp; 5182 int ret; 5183 5184 if (*optlen < 2) 5185 return -EINVAL; 5186 5187 if (getopt) { 5188 if (!inet_csk(sk)->icsk_ca_ops) 5189 return -EINVAL; 5190 /* BPF expects NULL-terminated tcp-cc string */ 5191 optval[--(*optlen)] = '\0'; 5192 return do_tcp_getsockopt(sk, SOL_TCP, TCP_CONGESTION, 5193 KERNEL_SOCKPTR(optval), 5194 KERNEL_SOCKPTR(optlen)); 5195 } 5196 5197 /* "cdg" is the only cc that alloc a ptr 5198 * in inet_csk_ca area. The bpf-tcp-cc may 5199 * overwrite this ptr after switching to cdg. 5200 */ 5201 if (*optlen >= sizeof("cdg") - 1 && !strncmp("cdg", optval, *optlen)) 5202 return -ENOTSUPP; 5203 5204 /* It stops this looping 5205 * 5206 * .init => bpf_setsockopt(tcp_cc) => .init => 5207 * bpf_setsockopt(tcp_cc)" => .init => .... 5208 * 5209 * The second bpf_setsockopt(tcp_cc) is not allowed 5210 * in order to break the loop when both .init 5211 * are the same bpf prog. 5212 * 5213 * This applies even the second bpf_setsockopt(tcp_cc) 5214 * does not cause a loop. This limits only the first 5215 * '.init' can call bpf_setsockopt(TCP_CONGESTION) to 5216 * pick a fallback cc (eg. peer does not support ECN) 5217 * and the second '.init' cannot fallback to 5218 * another. 5219 */ 5220 tp = tcp_sk(sk); 5221 if (tp->bpf_chg_cc_inprogress) 5222 return -EBUSY; 5223 5224 tp->bpf_chg_cc_inprogress = 1; 5225 ret = do_tcp_setsockopt(sk, SOL_TCP, TCP_CONGESTION, 5226 KERNEL_SOCKPTR(optval), *optlen); 5227 tp->bpf_chg_cc_inprogress = 0; 5228 return ret; 5229 } 5230 5231 static int sol_tcp_sockopt(struct sock *sk, int optname, 5232 char *optval, int *optlen, 5233 bool getopt) 5234 { 5235 if (sk->sk_protocol != IPPROTO_TCP) 5236 return -EINVAL; 5237 5238 switch (optname) { 5239 case TCP_NODELAY: 5240 case TCP_MAXSEG: 5241 case TCP_KEEPIDLE: 5242 case TCP_KEEPINTVL: 5243 case TCP_KEEPCNT: 5244 case TCP_SYNCNT: 5245 case TCP_WINDOW_CLAMP: 5246 case TCP_THIN_LINEAR_TIMEOUTS: 5247 case TCP_USER_TIMEOUT: 5248 case TCP_NOTSENT_LOWAT: 5249 case TCP_SAVE_SYN: 5250 if (*optlen != sizeof(int)) 5251 return -EINVAL; 5252 break; 5253 case TCP_CONGESTION: 5254 return sol_tcp_sockopt_congestion(sk, optval, optlen, getopt); 5255 case TCP_SAVED_SYN: 5256 if (*optlen < 1) 5257 return -EINVAL; 5258 break; 5259 default: 5260 if (getopt) 5261 return -EINVAL; 5262 return bpf_sol_tcp_setsockopt(sk, optname, optval, *optlen); 5263 } 5264 5265 if (getopt) { 5266 if (optname == TCP_SAVED_SYN) { 5267 struct tcp_sock *tp = tcp_sk(sk); 5268 5269 if (!tp->saved_syn || 5270 *optlen > tcp_saved_syn_len(tp->saved_syn)) 5271 return -EINVAL; 5272 memcpy(optval, tp->saved_syn->data, *optlen); 5273 /* It cannot free tp->saved_syn here because it 5274 * does not know if the user space still needs it. 5275 */ 5276 return 0; 5277 } 5278 5279 return do_tcp_getsockopt(sk, SOL_TCP, optname, 5280 KERNEL_SOCKPTR(optval), 5281 KERNEL_SOCKPTR(optlen)); 5282 } 5283 5284 return do_tcp_setsockopt(sk, SOL_TCP, optname, 5285 KERNEL_SOCKPTR(optval), *optlen); 5286 } 5287 5288 static int sol_ip_sockopt(struct sock *sk, int optname, 5289 char *optval, int *optlen, 5290 bool getopt) 5291 { 5292 if (sk->sk_family != AF_INET) 5293 return -EINVAL; 5294 5295 switch (optname) { 5296 case IP_TOS: 5297 if (*optlen != sizeof(int)) 5298 return -EINVAL; 5299 break; 5300 default: 5301 return -EINVAL; 5302 } 5303 5304 if (getopt) 5305 return do_ip_getsockopt(sk, SOL_IP, optname, 5306 KERNEL_SOCKPTR(optval), 5307 KERNEL_SOCKPTR(optlen)); 5308 5309 return do_ip_setsockopt(sk, SOL_IP, optname, 5310 KERNEL_SOCKPTR(optval), *optlen); 5311 } 5312 5313 static int sol_ipv6_sockopt(struct sock *sk, int optname, 5314 char *optval, int *optlen, 5315 bool getopt) 5316 { 5317 if (sk->sk_family != AF_INET6) 5318 return -EINVAL; 5319 5320 switch (optname) { 5321 case IPV6_TCLASS: 5322 case IPV6_AUTOFLOWLABEL: 5323 if (*optlen != sizeof(int)) 5324 return -EINVAL; 5325 break; 5326 default: 5327 return -EINVAL; 5328 } 5329 5330 if (getopt) 5331 return ipv6_bpf_stub->ipv6_getsockopt(sk, SOL_IPV6, optname, 5332 KERNEL_SOCKPTR(optval), 5333 KERNEL_SOCKPTR(optlen)); 5334 5335 return ipv6_bpf_stub->ipv6_setsockopt(sk, SOL_IPV6, optname, 5336 KERNEL_SOCKPTR(optval), *optlen); 5337 } 5338 5339 static int __bpf_setsockopt(struct sock *sk, int level, int optname, 5340 char *optval, int optlen) 5341 { 5342 if (!sk_fullsock(sk)) 5343 return -EINVAL; 5344 5345 if (level == SOL_SOCKET) 5346 return sol_socket_sockopt(sk, optname, optval, &optlen, false); 5347 else if (IS_ENABLED(CONFIG_INET) && level == SOL_IP) 5348 return sol_ip_sockopt(sk, optname, optval, &optlen, false); 5349 else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6) 5350 return sol_ipv6_sockopt(sk, optname, optval, &optlen, false); 5351 else if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP) 5352 return sol_tcp_sockopt(sk, optname, optval, &optlen, false); 5353 5354 return -EINVAL; 5355 } 5356 5357 static int _bpf_setsockopt(struct sock *sk, int level, int optname, 5358 char *optval, int optlen) 5359 { 5360 if (sk_fullsock(sk)) 5361 sock_owned_by_me(sk); 5362 return __bpf_setsockopt(sk, level, optname, optval, optlen); 5363 } 5364 5365 static int __bpf_getsockopt(struct sock *sk, int level, int optname, 5366 char *optval, int optlen) 5367 { 5368 int err, saved_optlen = optlen; 5369 5370 if (!sk_fullsock(sk)) { 5371 err = -EINVAL; 5372 goto done; 5373 } 5374 5375 if (level == SOL_SOCKET) 5376 err = sol_socket_sockopt(sk, optname, optval, &optlen, true); 5377 else if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP) 5378 err = sol_tcp_sockopt(sk, optname, optval, &optlen, true); 5379 else if (IS_ENABLED(CONFIG_INET) && level == SOL_IP) 5380 err = sol_ip_sockopt(sk, optname, optval, &optlen, true); 5381 else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6) 5382 err = sol_ipv6_sockopt(sk, optname, optval, &optlen, true); 5383 else 5384 err = -EINVAL; 5385 5386 done: 5387 if (err) 5388 optlen = 0; 5389 if (optlen < saved_optlen) 5390 memset(optval + optlen, 0, saved_optlen - optlen); 5391 return err; 5392 } 5393 5394 static int _bpf_getsockopt(struct sock *sk, int level, int optname, 5395 char *optval, int optlen) 5396 { 5397 if (sk_fullsock(sk)) 5398 sock_owned_by_me(sk); 5399 return __bpf_getsockopt(sk, level, optname, optval, optlen); 5400 } 5401 5402 BPF_CALL_5(bpf_sk_setsockopt, struct sock *, sk, int, level, 5403 int, optname, char *, optval, int, optlen) 5404 { 5405 return _bpf_setsockopt(sk, level, optname, optval, optlen); 5406 } 5407 5408 const struct bpf_func_proto bpf_sk_setsockopt_proto = { 5409 .func = bpf_sk_setsockopt, 5410 .gpl_only = false, 5411 .ret_type = RET_INTEGER, 5412 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 5413 .arg2_type = ARG_ANYTHING, 5414 .arg3_type = ARG_ANYTHING, 5415 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5416 .arg5_type = ARG_CONST_SIZE, 5417 }; 5418 5419 BPF_CALL_5(bpf_sk_getsockopt, struct sock *, sk, int, level, 5420 int, optname, char *, optval, int, optlen) 5421 { 5422 return _bpf_getsockopt(sk, level, optname, optval, optlen); 5423 } 5424 5425 const struct bpf_func_proto bpf_sk_getsockopt_proto = { 5426 .func = bpf_sk_getsockopt, 5427 .gpl_only = false, 5428 .ret_type = RET_INTEGER, 5429 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 5430 .arg2_type = ARG_ANYTHING, 5431 .arg3_type = ARG_ANYTHING, 5432 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 5433 .arg5_type = ARG_CONST_SIZE, 5434 }; 5435 5436 BPF_CALL_5(bpf_unlocked_sk_setsockopt, struct sock *, sk, int, level, 5437 int, optname, char *, optval, int, optlen) 5438 { 5439 return __bpf_setsockopt(sk, level, optname, optval, optlen); 5440 } 5441 5442 const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto = { 5443 .func = bpf_unlocked_sk_setsockopt, 5444 .gpl_only = false, 5445 .ret_type = RET_INTEGER, 5446 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 5447 .arg2_type = ARG_ANYTHING, 5448 .arg3_type = ARG_ANYTHING, 5449 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5450 .arg5_type = ARG_CONST_SIZE, 5451 }; 5452 5453 BPF_CALL_5(bpf_unlocked_sk_getsockopt, struct sock *, sk, int, level, 5454 int, optname, char *, optval, int, optlen) 5455 { 5456 return __bpf_getsockopt(sk, level, optname, optval, optlen); 5457 } 5458 5459 const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto = { 5460 .func = bpf_unlocked_sk_getsockopt, 5461 .gpl_only = false, 5462 .ret_type = RET_INTEGER, 5463 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 5464 .arg2_type = ARG_ANYTHING, 5465 .arg3_type = ARG_ANYTHING, 5466 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 5467 .arg5_type = ARG_CONST_SIZE, 5468 }; 5469 5470 BPF_CALL_5(bpf_sock_addr_setsockopt, struct bpf_sock_addr_kern *, ctx, 5471 int, level, int, optname, char *, optval, int, optlen) 5472 { 5473 return _bpf_setsockopt(ctx->sk, level, optname, optval, optlen); 5474 } 5475 5476 static const struct bpf_func_proto bpf_sock_addr_setsockopt_proto = { 5477 .func = bpf_sock_addr_setsockopt, 5478 .gpl_only = false, 5479 .ret_type = RET_INTEGER, 5480 .arg1_type = ARG_PTR_TO_CTX, 5481 .arg2_type = ARG_ANYTHING, 5482 .arg3_type = ARG_ANYTHING, 5483 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5484 .arg5_type = ARG_CONST_SIZE, 5485 }; 5486 5487 BPF_CALL_5(bpf_sock_addr_getsockopt, struct bpf_sock_addr_kern *, ctx, 5488 int, level, int, optname, char *, optval, int, optlen) 5489 { 5490 return _bpf_getsockopt(ctx->sk, level, optname, optval, optlen); 5491 } 5492 5493 static const struct bpf_func_proto bpf_sock_addr_getsockopt_proto = { 5494 .func = bpf_sock_addr_getsockopt, 5495 .gpl_only = false, 5496 .ret_type = RET_INTEGER, 5497 .arg1_type = ARG_PTR_TO_CTX, 5498 .arg2_type = ARG_ANYTHING, 5499 .arg3_type = ARG_ANYTHING, 5500 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 5501 .arg5_type = ARG_CONST_SIZE, 5502 }; 5503 5504 BPF_CALL_5(bpf_sock_ops_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, 5505 int, level, int, optname, char *, optval, int, optlen) 5506 { 5507 return _bpf_setsockopt(bpf_sock->sk, level, optname, optval, optlen); 5508 } 5509 5510 static const struct bpf_func_proto bpf_sock_ops_setsockopt_proto = { 5511 .func = bpf_sock_ops_setsockopt, 5512 .gpl_only = false, 5513 .ret_type = RET_INTEGER, 5514 .arg1_type = ARG_PTR_TO_CTX, 5515 .arg2_type = ARG_ANYTHING, 5516 .arg3_type = ARG_ANYTHING, 5517 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5518 .arg5_type = ARG_CONST_SIZE, 5519 }; 5520 5521 static int bpf_sock_ops_get_syn(struct bpf_sock_ops_kern *bpf_sock, 5522 int optname, const u8 **start) 5523 { 5524 struct sk_buff *syn_skb = bpf_sock->syn_skb; 5525 const u8 *hdr_start; 5526 int ret; 5527 5528 if (syn_skb) { 5529 /* sk is a request_sock here */ 5530 5531 if (optname == TCP_BPF_SYN) { 5532 hdr_start = syn_skb->data; 5533 ret = tcp_hdrlen(syn_skb); 5534 } else if (optname == TCP_BPF_SYN_IP) { 5535 hdr_start = skb_network_header(syn_skb); 5536 ret = skb_network_header_len(syn_skb) + 5537 tcp_hdrlen(syn_skb); 5538 } else { 5539 /* optname == TCP_BPF_SYN_MAC */ 5540 hdr_start = skb_mac_header(syn_skb); 5541 ret = skb_mac_header_len(syn_skb) + 5542 skb_network_header_len(syn_skb) + 5543 tcp_hdrlen(syn_skb); 5544 } 5545 } else { 5546 struct sock *sk = bpf_sock->sk; 5547 struct saved_syn *saved_syn; 5548 5549 if (sk->sk_state == TCP_NEW_SYN_RECV) 5550 /* synack retransmit. bpf_sock->syn_skb will 5551 * not be available. It has to resort to 5552 * saved_syn (if it is saved). 5553 */ 5554 saved_syn = inet_reqsk(sk)->saved_syn; 5555 else 5556 saved_syn = tcp_sk(sk)->saved_syn; 5557 5558 if (!saved_syn) 5559 return -ENOENT; 5560 5561 if (optname == TCP_BPF_SYN) { 5562 hdr_start = saved_syn->data + 5563 saved_syn->mac_hdrlen + 5564 saved_syn->network_hdrlen; 5565 ret = saved_syn->tcp_hdrlen; 5566 } else if (optname == TCP_BPF_SYN_IP) { 5567 hdr_start = saved_syn->data + 5568 saved_syn->mac_hdrlen; 5569 ret = saved_syn->network_hdrlen + 5570 saved_syn->tcp_hdrlen; 5571 } else { 5572 /* optname == TCP_BPF_SYN_MAC */ 5573 5574 /* TCP_SAVE_SYN may not have saved the mac hdr */ 5575 if (!saved_syn->mac_hdrlen) 5576 return -ENOENT; 5577 5578 hdr_start = saved_syn->data; 5579 ret = saved_syn->mac_hdrlen + 5580 saved_syn->network_hdrlen + 5581 saved_syn->tcp_hdrlen; 5582 } 5583 } 5584 5585 *start = hdr_start; 5586 return ret; 5587 } 5588 5589 BPF_CALL_5(bpf_sock_ops_getsockopt, struct bpf_sock_ops_kern *, bpf_sock, 5590 int, level, int, optname, char *, optval, int, optlen) 5591 { 5592 if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP && 5593 optname >= TCP_BPF_SYN && optname <= TCP_BPF_SYN_MAC) { 5594 int ret, copy_len = 0; 5595 const u8 *start; 5596 5597 ret = bpf_sock_ops_get_syn(bpf_sock, optname, &start); 5598 if (ret > 0) { 5599 copy_len = ret; 5600 if (optlen < copy_len) { 5601 copy_len = optlen; 5602 ret = -ENOSPC; 5603 } 5604 5605 memcpy(optval, start, copy_len); 5606 } 5607 5608 /* Zero out unused buffer at the end */ 5609 memset(optval + copy_len, 0, optlen - copy_len); 5610 5611 return ret; 5612 } 5613 5614 return _bpf_getsockopt(bpf_sock->sk, level, optname, optval, optlen); 5615 } 5616 5617 static const struct bpf_func_proto bpf_sock_ops_getsockopt_proto = { 5618 .func = bpf_sock_ops_getsockopt, 5619 .gpl_only = false, 5620 .ret_type = RET_INTEGER, 5621 .arg1_type = ARG_PTR_TO_CTX, 5622 .arg2_type = ARG_ANYTHING, 5623 .arg3_type = ARG_ANYTHING, 5624 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 5625 .arg5_type = ARG_CONST_SIZE, 5626 }; 5627 5628 BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock, 5629 int, argval) 5630 { 5631 struct sock *sk = bpf_sock->sk; 5632 int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS; 5633 5634 if (!IS_ENABLED(CONFIG_INET) || !sk_fullsock(sk)) 5635 return -EINVAL; 5636 5637 tcp_sk(sk)->bpf_sock_ops_cb_flags = val; 5638 5639 return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS); 5640 } 5641 5642 static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = { 5643 .func = bpf_sock_ops_cb_flags_set, 5644 .gpl_only = false, 5645 .ret_type = RET_INTEGER, 5646 .arg1_type = ARG_PTR_TO_CTX, 5647 .arg2_type = ARG_ANYTHING, 5648 }; 5649 5650 const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly; 5651 EXPORT_SYMBOL_GPL(ipv6_bpf_stub); 5652 5653 BPF_CALL_3(bpf_bind, struct bpf_sock_addr_kern *, ctx, struct sockaddr *, addr, 5654 int, addr_len) 5655 { 5656 #ifdef CONFIG_INET 5657 struct sock *sk = ctx->sk; 5658 u32 flags = BIND_FROM_BPF; 5659 int err; 5660 5661 err = -EINVAL; 5662 if (addr_len < offsetofend(struct sockaddr, sa_family)) 5663 return err; 5664 if (addr->sa_family == AF_INET) { 5665 if (addr_len < sizeof(struct sockaddr_in)) 5666 return err; 5667 if (((struct sockaddr_in *)addr)->sin_port == htons(0)) 5668 flags |= BIND_FORCE_ADDRESS_NO_PORT; 5669 return __inet_bind(sk, addr, addr_len, flags); 5670 #if IS_ENABLED(CONFIG_IPV6) 5671 } else if (addr->sa_family == AF_INET6) { 5672 if (addr_len < SIN6_LEN_RFC2133) 5673 return err; 5674 if (((struct sockaddr_in6 *)addr)->sin6_port == htons(0)) 5675 flags |= BIND_FORCE_ADDRESS_NO_PORT; 5676 /* ipv6_bpf_stub cannot be NULL, since it's called from 5677 * bpf_cgroup_inet6_connect hook and ipv6 is already loaded 5678 */ 5679 return ipv6_bpf_stub->inet6_bind(sk, addr, addr_len, flags); 5680 #endif /* CONFIG_IPV6 */ 5681 } 5682 #endif /* CONFIG_INET */ 5683 5684 return -EAFNOSUPPORT; 5685 } 5686 5687 static const struct bpf_func_proto bpf_bind_proto = { 5688 .func = bpf_bind, 5689 .gpl_only = false, 5690 .ret_type = RET_INTEGER, 5691 .arg1_type = ARG_PTR_TO_CTX, 5692 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5693 .arg3_type = ARG_CONST_SIZE, 5694 }; 5695 5696 #ifdef CONFIG_XFRM 5697 5698 #if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \ 5699 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES)) 5700 5701 struct metadata_dst __percpu *xfrm_bpf_md_dst; 5702 EXPORT_SYMBOL_GPL(xfrm_bpf_md_dst); 5703 5704 #endif 5705 5706 BPF_CALL_5(bpf_skb_get_xfrm_state, struct sk_buff *, skb, u32, index, 5707 struct bpf_xfrm_state *, to, u32, size, u64, flags) 5708 { 5709 const struct sec_path *sp = skb_sec_path(skb); 5710 const struct xfrm_state *x; 5711 5712 if (!sp || unlikely(index >= sp->len || flags)) 5713 goto err_clear; 5714 5715 x = sp->xvec[index]; 5716 5717 if (unlikely(size != sizeof(struct bpf_xfrm_state))) 5718 goto err_clear; 5719 5720 to->reqid = x->props.reqid; 5721 to->spi = x->id.spi; 5722 to->family = x->props.family; 5723 to->ext = 0; 5724 5725 if (to->family == AF_INET6) { 5726 memcpy(to->remote_ipv6, x->props.saddr.a6, 5727 sizeof(to->remote_ipv6)); 5728 } else { 5729 to->remote_ipv4 = x->props.saddr.a4; 5730 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); 5731 } 5732 5733 return 0; 5734 err_clear: 5735 memset(to, 0, size); 5736 return -EINVAL; 5737 } 5738 5739 static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto = { 5740 .func = bpf_skb_get_xfrm_state, 5741 .gpl_only = false, 5742 .ret_type = RET_INTEGER, 5743 .arg1_type = ARG_PTR_TO_CTX, 5744 .arg2_type = ARG_ANYTHING, 5745 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 5746 .arg4_type = ARG_CONST_SIZE, 5747 .arg5_type = ARG_ANYTHING, 5748 }; 5749 #endif 5750 5751 #if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6) 5752 static int bpf_fib_set_fwd_params(struct bpf_fib_lookup *params, u32 mtu) 5753 { 5754 params->h_vlan_TCI = 0; 5755 params->h_vlan_proto = 0; 5756 if (mtu) 5757 params->mtu_result = mtu; /* union with tot_len */ 5758 5759 return 0; 5760 } 5761 #endif 5762 5763 #if IS_ENABLED(CONFIG_INET) 5764 static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params, 5765 u32 flags, bool check_mtu) 5766 { 5767 struct fib_nh_common *nhc; 5768 struct in_device *in_dev; 5769 struct neighbour *neigh; 5770 struct net_device *dev; 5771 struct fib_result res; 5772 struct flowi4 fl4; 5773 u32 mtu = 0; 5774 int err; 5775 5776 dev = dev_get_by_index_rcu(net, params->ifindex); 5777 if (unlikely(!dev)) 5778 return -ENODEV; 5779 5780 /* verify forwarding is enabled on this interface */ 5781 in_dev = __in_dev_get_rcu(dev); 5782 if (unlikely(!in_dev || !IN_DEV_FORWARD(in_dev))) 5783 return BPF_FIB_LKUP_RET_FWD_DISABLED; 5784 5785 if (flags & BPF_FIB_LOOKUP_OUTPUT) { 5786 fl4.flowi4_iif = 1; 5787 fl4.flowi4_oif = params->ifindex; 5788 } else { 5789 fl4.flowi4_iif = params->ifindex; 5790 fl4.flowi4_oif = 0; 5791 } 5792 fl4.flowi4_tos = params->tos & IPTOS_RT_MASK; 5793 fl4.flowi4_scope = RT_SCOPE_UNIVERSE; 5794 fl4.flowi4_flags = 0; 5795 5796 fl4.flowi4_proto = params->l4_protocol; 5797 fl4.daddr = params->ipv4_dst; 5798 fl4.saddr = params->ipv4_src; 5799 fl4.fl4_sport = params->sport; 5800 fl4.fl4_dport = params->dport; 5801 fl4.flowi4_multipath_hash = 0; 5802 5803 if (flags & BPF_FIB_LOOKUP_DIRECT) { 5804 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; 5805 struct fib_table *tb; 5806 5807 if (flags & BPF_FIB_LOOKUP_TBID) { 5808 tbid = params->tbid; 5809 /* zero out for vlan output */ 5810 params->tbid = 0; 5811 } 5812 5813 tb = fib_get_table(net, tbid); 5814 if (unlikely(!tb)) 5815 return BPF_FIB_LKUP_RET_NOT_FWDED; 5816 5817 err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); 5818 } else { 5819 fl4.flowi4_mark = 0; 5820 fl4.flowi4_secid = 0; 5821 fl4.flowi4_tun_key.tun_id = 0; 5822 fl4.flowi4_uid = sock_net_uid(net, NULL); 5823 5824 err = fib_lookup(net, &fl4, &res, FIB_LOOKUP_NOREF); 5825 } 5826 5827 if (err) { 5828 /* map fib lookup errors to RTN_ type */ 5829 if (err == -EINVAL) 5830 return BPF_FIB_LKUP_RET_BLACKHOLE; 5831 if (err == -EHOSTUNREACH) 5832 return BPF_FIB_LKUP_RET_UNREACHABLE; 5833 if (err == -EACCES) 5834 return BPF_FIB_LKUP_RET_PROHIBIT; 5835 5836 return BPF_FIB_LKUP_RET_NOT_FWDED; 5837 } 5838 5839 if (res.type != RTN_UNICAST) 5840 return BPF_FIB_LKUP_RET_NOT_FWDED; 5841 5842 if (fib_info_num_path(res.fi) > 1) 5843 fib_select_path(net, &res, &fl4, NULL); 5844 5845 if (check_mtu) { 5846 mtu = ip_mtu_from_fib_result(&res, params->ipv4_dst); 5847 if (params->tot_len > mtu) { 5848 params->mtu_result = mtu; /* union with tot_len */ 5849 return BPF_FIB_LKUP_RET_FRAG_NEEDED; 5850 } 5851 } 5852 5853 nhc = res.nhc; 5854 5855 /* do not handle lwt encaps right now */ 5856 if (nhc->nhc_lwtstate) 5857 return BPF_FIB_LKUP_RET_UNSUPP_LWT; 5858 5859 dev = nhc->nhc_dev; 5860 5861 params->rt_metric = res.fi->fib_priority; 5862 params->ifindex = dev->ifindex; 5863 5864 /* xdp and cls_bpf programs are run in RCU-bh so 5865 * rcu_read_lock_bh is not needed here 5866 */ 5867 if (likely(nhc->nhc_gw_family != AF_INET6)) { 5868 if (nhc->nhc_gw_family) 5869 params->ipv4_dst = nhc->nhc_gw.ipv4; 5870 } else { 5871 struct in6_addr *dst = (struct in6_addr *)params->ipv6_dst; 5872 5873 params->family = AF_INET6; 5874 *dst = nhc->nhc_gw.ipv6; 5875 } 5876 5877 if (flags & BPF_FIB_LOOKUP_SKIP_NEIGH) 5878 goto set_fwd_params; 5879 5880 if (likely(nhc->nhc_gw_family != AF_INET6)) 5881 neigh = __ipv4_neigh_lookup_noref(dev, 5882 (__force u32)params->ipv4_dst); 5883 else 5884 neigh = __ipv6_neigh_lookup_noref_stub(dev, params->ipv6_dst); 5885 5886 if (!neigh || !(READ_ONCE(neigh->nud_state) & NUD_VALID)) 5887 return BPF_FIB_LKUP_RET_NO_NEIGH; 5888 memcpy(params->dmac, neigh->ha, ETH_ALEN); 5889 memcpy(params->smac, dev->dev_addr, ETH_ALEN); 5890 5891 set_fwd_params: 5892 return bpf_fib_set_fwd_params(params, mtu); 5893 } 5894 #endif 5895 5896 #if IS_ENABLED(CONFIG_IPV6) 5897 static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params, 5898 u32 flags, bool check_mtu) 5899 { 5900 struct in6_addr *src = (struct in6_addr *) params->ipv6_src; 5901 struct in6_addr *dst = (struct in6_addr *) params->ipv6_dst; 5902 struct fib6_result res = {}; 5903 struct neighbour *neigh; 5904 struct net_device *dev; 5905 struct inet6_dev *idev; 5906 struct flowi6 fl6; 5907 int strict = 0; 5908 int oif, err; 5909 u32 mtu = 0; 5910 5911 /* link local addresses are never forwarded */ 5912 if (rt6_need_strict(dst) || rt6_need_strict(src)) 5913 return BPF_FIB_LKUP_RET_NOT_FWDED; 5914 5915 dev = dev_get_by_index_rcu(net, params->ifindex); 5916 if (unlikely(!dev)) 5917 return -ENODEV; 5918 5919 idev = __in6_dev_get_safely(dev); 5920 if (unlikely(!idev || !idev->cnf.forwarding)) 5921 return BPF_FIB_LKUP_RET_FWD_DISABLED; 5922 5923 if (flags & BPF_FIB_LOOKUP_OUTPUT) { 5924 fl6.flowi6_iif = 1; 5925 oif = fl6.flowi6_oif = params->ifindex; 5926 } else { 5927 oif = fl6.flowi6_iif = params->ifindex; 5928 fl6.flowi6_oif = 0; 5929 strict = RT6_LOOKUP_F_HAS_SADDR; 5930 } 5931 fl6.flowlabel = params->flowinfo; 5932 fl6.flowi6_scope = 0; 5933 fl6.flowi6_flags = 0; 5934 fl6.mp_hash = 0; 5935 5936 fl6.flowi6_proto = params->l4_protocol; 5937 fl6.daddr = *dst; 5938 fl6.saddr = *src; 5939 fl6.fl6_sport = params->sport; 5940 fl6.fl6_dport = params->dport; 5941 5942 if (flags & BPF_FIB_LOOKUP_DIRECT) { 5943 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; 5944 struct fib6_table *tb; 5945 5946 if (flags & BPF_FIB_LOOKUP_TBID) { 5947 tbid = params->tbid; 5948 /* zero out for vlan output */ 5949 params->tbid = 0; 5950 } 5951 5952 tb = ipv6_stub->fib6_get_table(net, tbid); 5953 if (unlikely(!tb)) 5954 return BPF_FIB_LKUP_RET_NOT_FWDED; 5955 5956 err = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6, &res, 5957 strict); 5958 } else { 5959 fl6.flowi6_mark = 0; 5960 fl6.flowi6_secid = 0; 5961 fl6.flowi6_tun_key.tun_id = 0; 5962 fl6.flowi6_uid = sock_net_uid(net, NULL); 5963 5964 err = ipv6_stub->fib6_lookup(net, oif, &fl6, &res, strict); 5965 } 5966 5967 if (unlikely(err || IS_ERR_OR_NULL(res.f6i) || 5968 res.f6i == net->ipv6.fib6_null_entry)) 5969 return BPF_FIB_LKUP_RET_NOT_FWDED; 5970 5971 switch (res.fib6_type) { 5972 /* only unicast is forwarded */ 5973 case RTN_UNICAST: 5974 break; 5975 case RTN_BLACKHOLE: 5976 return BPF_FIB_LKUP_RET_BLACKHOLE; 5977 case RTN_UNREACHABLE: 5978 return BPF_FIB_LKUP_RET_UNREACHABLE; 5979 case RTN_PROHIBIT: 5980 return BPF_FIB_LKUP_RET_PROHIBIT; 5981 default: 5982 return BPF_FIB_LKUP_RET_NOT_FWDED; 5983 } 5984 5985 ipv6_stub->fib6_select_path(net, &res, &fl6, fl6.flowi6_oif, 5986 fl6.flowi6_oif != 0, NULL, strict); 5987 5988 if (check_mtu) { 5989 mtu = ipv6_stub->ip6_mtu_from_fib6(&res, dst, src); 5990 if (params->tot_len > mtu) { 5991 params->mtu_result = mtu; /* union with tot_len */ 5992 return BPF_FIB_LKUP_RET_FRAG_NEEDED; 5993 } 5994 } 5995 5996 if (res.nh->fib_nh_lws) 5997 return BPF_FIB_LKUP_RET_UNSUPP_LWT; 5998 5999 if (res.nh->fib_nh_gw_family) 6000 *dst = res.nh->fib_nh_gw6; 6001 6002 dev = res.nh->fib_nh_dev; 6003 params->rt_metric = res.f6i->fib6_metric; 6004 params->ifindex = dev->ifindex; 6005 6006 if (flags & BPF_FIB_LOOKUP_SKIP_NEIGH) 6007 goto set_fwd_params; 6008 6009 /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is 6010 * not needed here. 6011 */ 6012 neigh = __ipv6_neigh_lookup_noref_stub(dev, dst); 6013 if (!neigh || !(READ_ONCE(neigh->nud_state) & NUD_VALID)) 6014 return BPF_FIB_LKUP_RET_NO_NEIGH; 6015 memcpy(params->dmac, neigh->ha, ETH_ALEN); 6016 memcpy(params->smac, dev->dev_addr, ETH_ALEN); 6017 6018 set_fwd_params: 6019 return bpf_fib_set_fwd_params(params, mtu); 6020 } 6021 #endif 6022 6023 #define BPF_FIB_LOOKUP_MASK (BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT | \ 6024 BPF_FIB_LOOKUP_SKIP_NEIGH | BPF_FIB_LOOKUP_TBID) 6025 6026 BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx, 6027 struct bpf_fib_lookup *, params, int, plen, u32, flags) 6028 { 6029 if (plen < sizeof(*params)) 6030 return -EINVAL; 6031 6032 if (flags & ~BPF_FIB_LOOKUP_MASK) 6033 return -EINVAL; 6034 6035 switch (params->family) { 6036 #if IS_ENABLED(CONFIG_INET) 6037 case AF_INET: 6038 return bpf_ipv4_fib_lookup(dev_net(ctx->rxq->dev), params, 6039 flags, true); 6040 #endif 6041 #if IS_ENABLED(CONFIG_IPV6) 6042 case AF_INET6: 6043 return bpf_ipv6_fib_lookup(dev_net(ctx->rxq->dev), params, 6044 flags, true); 6045 #endif 6046 } 6047 return -EAFNOSUPPORT; 6048 } 6049 6050 static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = { 6051 .func = bpf_xdp_fib_lookup, 6052 .gpl_only = true, 6053 .ret_type = RET_INTEGER, 6054 .arg1_type = ARG_PTR_TO_CTX, 6055 .arg2_type = ARG_PTR_TO_MEM, 6056 .arg3_type = ARG_CONST_SIZE, 6057 .arg4_type = ARG_ANYTHING, 6058 }; 6059 6060 BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb, 6061 struct bpf_fib_lookup *, params, int, plen, u32, flags) 6062 { 6063 struct net *net = dev_net(skb->dev); 6064 int rc = -EAFNOSUPPORT; 6065 bool check_mtu = false; 6066 6067 if (plen < sizeof(*params)) 6068 return -EINVAL; 6069 6070 if (flags & ~BPF_FIB_LOOKUP_MASK) 6071 return -EINVAL; 6072 6073 if (params->tot_len) 6074 check_mtu = true; 6075 6076 switch (params->family) { 6077 #if IS_ENABLED(CONFIG_INET) 6078 case AF_INET: 6079 rc = bpf_ipv4_fib_lookup(net, params, flags, check_mtu); 6080 break; 6081 #endif 6082 #if IS_ENABLED(CONFIG_IPV6) 6083 case AF_INET6: 6084 rc = bpf_ipv6_fib_lookup(net, params, flags, check_mtu); 6085 break; 6086 #endif 6087 } 6088 6089 if (rc == BPF_FIB_LKUP_RET_SUCCESS && !check_mtu) { 6090 struct net_device *dev; 6091 6092 /* When tot_len isn't provided by user, check skb 6093 * against MTU of FIB lookup resulting net_device 6094 */ 6095 dev = dev_get_by_index_rcu(net, params->ifindex); 6096 if (!is_skb_forwardable(dev, skb)) 6097 rc = BPF_FIB_LKUP_RET_FRAG_NEEDED; 6098 6099 params->mtu_result = dev->mtu; /* union with tot_len */ 6100 } 6101 6102 return rc; 6103 } 6104 6105 static const struct bpf_func_proto bpf_skb_fib_lookup_proto = { 6106 .func = bpf_skb_fib_lookup, 6107 .gpl_only = true, 6108 .ret_type = RET_INTEGER, 6109 .arg1_type = ARG_PTR_TO_CTX, 6110 .arg2_type = ARG_PTR_TO_MEM, 6111 .arg3_type = ARG_CONST_SIZE, 6112 .arg4_type = ARG_ANYTHING, 6113 }; 6114 6115 static struct net_device *__dev_via_ifindex(struct net_device *dev_curr, 6116 u32 ifindex) 6117 { 6118 struct net *netns = dev_net(dev_curr); 6119 6120 /* Non-redirect use-cases can use ifindex=0 and save ifindex lookup */ 6121 if (ifindex == 0) 6122 return dev_curr; 6123 6124 return dev_get_by_index_rcu(netns, ifindex); 6125 } 6126 6127 BPF_CALL_5(bpf_skb_check_mtu, struct sk_buff *, skb, 6128 u32, ifindex, u32 *, mtu_len, s32, len_diff, u64, flags) 6129 { 6130 int ret = BPF_MTU_CHK_RET_FRAG_NEEDED; 6131 struct net_device *dev = skb->dev; 6132 int skb_len, dev_len; 6133 int mtu; 6134 6135 if (unlikely(flags & ~(BPF_MTU_CHK_SEGS))) 6136 return -EINVAL; 6137 6138 if (unlikely(flags & BPF_MTU_CHK_SEGS && (len_diff || *mtu_len))) 6139 return -EINVAL; 6140 6141 dev = __dev_via_ifindex(dev, ifindex); 6142 if (unlikely(!dev)) 6143 return -ENODEV; 6144 6145 mtu = READ_ONCE(dev->mtu); 6146 6147 dev_len = mtu + dev->hard_header_len; 6148 6149 /* If set use *mtu_len as input, L3 as iph->tot_len (like fib_lookup) */ 6150 skb_len = *mtu_len ? *mtu_len + dev->hard_header_len : skb->len; 6151 6152 skb_len += len_diff; /* minus result pass check */ 6153 if (skb_len <= dev_len) { 6154 ret = BPF_MTU_CHK_RET_SUCCESS; 6155 goto out; 6156 } 6157 /* At this point, skb->len exceed MTU, but as it include length of all 6158 * segments, it can still be below MTU. The SKB can possibly get 6159 * re-segmented in transmit path (see validate_xmit_skb). Thus, user 6160 * must choose if segs are to be MTU checked. 6161 */ 6162 if (skb_is_gso(skb)) { 6163 ret = BPF_MTU_CHK_RET_SUCCESS; 6164 6165 if (flags & BPF_MTU_CHK_SEGS && 6166 !skb_gso_validate_network_len(skb, mtu)) 6167 ret = BPF_MTU_CHK_RET_SEGS_TOOBIG; 6168 } 6169 out: 6170 /* BPF verifier guarantees valid pointer */ 6171 *mtu_len = mtu; 6172 6173 return ret; 6174 } 6175 6176 BPF_CALL_5(bpf_xdp_check_mtu, struct xdp_buff *, xdp, 6177 u32, ifindex, u32 *, mtu_len, s32, len_diff, u64, flags) 6178 { 6179 struct net_device *dev = xdp->rxq->dev; 6180 int xdp_len = xdp->data_end - xdp->data; 6181 int ret = BPF_MTU_CHK_RET_SUCCESS; 6182 int mtu, dev_len; 6183 6184 /* XDP variant doesn't support multi-buffer segment check (yet) */ 6185 if (unlikely(flags)) 6186 return -EINVAL; 6187 6188 dev = __dev_via_ifindex(dev, ifindex); 6189 if (unlikely(!dev)) 6190 return -ENODEV; 6191 6192 mtu = READ_ONCE(dev->mtu); 6193 6194 /* Add L2-header as dev MTU is L3 size */ 6195 dev_len = mtu + dev->hard_header_len; 6196 6197 /* Use *mtu_len as input, L3 as iph->tot_len (like fib_lookup) */ 6198 if (*mtu_len) 6199 xdp_len = *mtu_len + dev->hard_header_len; 6200 6201 xdp_len += len_diff; /* minus result pass check */ 6202 if (xdp_len > dev_len) 6203 ret = BPF_MTU_CHK_RET_FRAG_NEEDED; 6204 6205 /* BPF verifier guarantees valid pointer */ 6206 *mtu_len = mtu; 6207 6208 return ret; 6209 } 6210 6211 static const struct bpf_func_proto bpf_skb_check_mtu_proto = { 6212 .func = bpf_skb_check_mtu, 6213 .gpl_only = true, 6214 .ret_type = RET_INTEGER, 6215 .arg1_type = ARG_PTR_TO_CTX, 6216 .arg2_type = ARG_ANYTHING, 6217 .arg3_type = ARG_PTR_TO_INT, 6218 .arg4_type = ARG_ANYTHING, 6219 .arg5_type = ARG_ANYTHING, 6220 }; 6221 6222 static const struct bpf_func_proto bpf_xdp_check_mtu_proto = { 6223 .func = bpf_xdp_check_mtu, 6224 .gpl_only = true, 6225 .ret_type = RET_INTEGER, 6226 .arg1_type = ARG_PTR_TO_CTX, 6227 .arg2_type = ARG_ANYTHING, 6228 .arg3_type = ARG_PTR_TO_INT, 6229 .arg4_type = ARG_ANYTHING, 6230 .arg5_type = ARG_ANYTHING, 6231 }; 6232 6233 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 6234 static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len) 6235 { 6236 int err; 6237 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)hdr; 6238 6239 if (!seg6_validate_srh(srh, len, false)) 6240 return -EINVAL; 6241 6242 switch (type) { 6243 case BPF_LWT_ENCAP_SEG6_INLINE: 6244 if (skb->protocol != htons(ETH_P_IPV6)) 6245 return -EBADMSG; 6246 6247 err = seg6_do_srh_inline(skb, srh); 6248 break; 6249 case BPF_LWT_ENCAP_SEG6: 6250 skb_reset_inner_headers(skb); 6251 skb->encapsulation = 1; 6252 err = seg6_do_srh_encap(skb, srh, IPPROTO_IPV6); 6253 break; 6254 default: 6255 return -EINVAL; 6256 } 6257 6258 bpf_compute_data_pointers(skb); 6259 if (err) 6260 return err; 6261 6262 skb_set_transport_header(skb, sizeof(struct ipv6hdr)); 6263 6264 return seg6_lookup_nexthop(skb, NULL, 0); 6265 } 6266 #endif /* CONFIG_IPV6_SEG6_BPF */ 6267 6268 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 6269 static int bpf_push_ip_encap(struct sk_buff *skb, void *hdr, u32 len, 6270 bool ingress) 6271 { 6272 return bpf_lwt_push_ip_encap(skb, hdr, len, ingress); 6273 } 6274 #endif 6275 6276 BPF_CALL_4(bpf_lwt_in_push_encap, struct sk_buff *, skb, u32, type, void *, hdr, 6277 u32, len) 6278 { 6279 switch (type) { 6280 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 6281 case BPF_LWT_ENCAP_SEG6: 6282 case BPF_LWT_ENCAP_SEG6_INLINE: 6283 return bpf_push_seg6_encap(skb, type, hdr, len); 6284 #endif 6285 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 6286 case BPF_LWT_ENCAP_IP: 6287 return bpf_push_ip_encap(skb, hdr, len, true /* ingress */); 6288 #endif 6289 default: 6290 return -EINVAL; 6291 } 6292 } 6293 6294 BPF_CALL_4(bpf_lwt_xmit_push_encap, struct sk_buff *, skb, u32, type, 6295 void *, hdr, u32, len) 6296 { 6297 switch (type) { 6298 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 6299 case BPF_LWT_ENCAP_IP: 6300 return bpf_push_ip_encap(skb, hdr, len, false /* egress */); 6301 #endif 6302 default: 6303 return -EINVAL; 6304 } 6305 } 6306 6307 static const struct bpf_func_proto bpf_lwt_in_push_encap_proto = { 6308 .func = bpf_lwt_in_push_encap, 6309 .gpl_only = false, 6310 .ret_type = RET_INTEGER, 6311 .arg1_type = ARG_PTR_TO_CTX, 6312 .arg2_type = ARG_ANYTHING, 6313 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6314 .arg4_type = ARG_CONST_SIZE 6315 }; 6316 6317 static const struct bpf_func_proto bpf_lwt_xmit_push_encap_proto = { 6318 .func = bpf_lwt_xmit_push_encap, 6319 .gpl_only = false, 6320 .ret_type = RET_INTEGER, 6321 .arg1_type = ARG_PTR_TO_CTX, 6322 .arg2_type = ARG_ANYTHING, 6323 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6324 .arg4_type = ARG_CONST_SIZE 6325 }; 6326 6327 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 6328 BPF_CALL_4(bpf_lwt_seg6_store_bytes, struct sk_buff *, skb, u32, offset, 6329 const void *, from, u32, len) 6330 { 6331 struct seg6_bpf_srh_state *srh_state = 6332 this_cpu_ptr(&seg6_bpf_srh_states); 6333 struct ipv6_sr_hdr *srh = srh_state->srh; 6334 void *srh_tlvs, *srh_end, *ptr; 6335 int srhoff = 0; 6336 6337 if (srh == NULL) 6338 return -EINVAL; 6339 6340 srh_tlvs = (void *)((char *)srh + ((srh->first_segment + 1) << 4)); 6341 srh_end = (void *)((char *)srh + sizeof(*srh) + srh_state->hdrlen); 6342 6343 ptr = skb->data + offset; 6344 if (ptr >= srh_tlvs && ptr + len <= srh_end) 6345 srh_state->valid = false; 6346 else if (ptr < (void *)&srh->flags || 6347 ptr + len > (void *)&srh->segments) 6348 return -EFAULT; 6349 6350 if (unlikely(bpf_try_make_writable(skb, offset + len))) 6351 return -EFAULT; 6352 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) 6353 return -EINVAL; 6354 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 6355 6356 memcpy(skb->data + offset, from, len); 6357 return 0; 6358 } 6359 6360 static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto = { 6361 .func = bpf_lwt_seg6_store_bytes, 6362 .gpl_only = false, 6363 .ret_type = RET_INTEGER, 6364 .arg1_type = ARG_PTR_TO_CTX, 6365 .arg2_type = ARG_ANYTHING, 6366 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6367 .arg4_type = ARG_CONST_SIZE 6368 }; 6369 6370 static void bpf_update_srh_state(struct sk_buff *skb) 6371 { 6372 struct seg6_bpf_srh_state *srh_state = 6373 this_cpu_ptr(&seg6_bpf_srh_states); 6374 int srhoff = 0; 6375 6376 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) { 6377 srh_state->srh = NULL; 6378 } else { 6379 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 6380 srh_state->hdrlen = srh_state->srh->hdrlen << 3; 6381 srh_state->valid = true; 6382 } 6383 } 6384 6385 BPF_CALL_4(bpf_lwt_seg6_action, struct sk_buff *, skb, 6386 u32, action, void *, param, u32, param_len) 6387 { 6388 struct seg6_bpf_srh_state *srh_state = 6389 this_cpu_ptr(&seg6_bpf_srh_states); 6390 int hdroff = 0; 6391 int err; 6392 6393 switch (action) { 6394 case SEG6_LOCAL_ACTION_END_X: 6395 if (!seg6_bpf_has_valid_srh(skb)) 6396 return -EBADMSG; 6397 if (param_len != sizeof(struct in6_addr)) 6398 return -EINVAL; 6399 return seg6_lookup_nexthop(skb, (struct in6_addr *)param, 0); 6400 case SEG6_LOCAL_ACTION_END_T: 6401 if (!seg6_bpf_has_valid_srh(skb)) 6402 return -EBADMSG; 6403 if (param_len != sizeof(int)) 6404 return -EINVAL; 6405 return seg6_lookup_nexthop(skb, NULL, *(int *)param); 6406 case SEG6_LOCAL_ACTION_END_DT6: 6407 if (!seg6_bpf_has_valid_srh(skb)) 6408 return -EBADMSG; 6409 if (param_len != sizeof(int)) 6410 return -EINVAL; 6411 6412 if (ipv6_find_hdr(skb, &hdroff, IPPROTO_IPV6, NULL, NULL) < 0) 6413 return -EBADMSG; 6414 if (!pskb_pull(skb, hdroff)) 6415 return -EBADMSG; 6416 6417 skb_postpull_rcsum(skb, skb_network_header(skb), hdroff); 6418 skb_reset_network_header(skb); 6419 skb_reset_transport_header(skb); 6420 skb->encapsulation = 0; 6421 6422 bpf_compute_data_pointers(skb); 6423 bpf_update_srh_state(skb); 6424 return seg6_lookup_nexthop(skb, NULL, *(int *)param); 6425 case SEG6_LOCAL_ACTION_END_B6: 6426 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) 6427 return -EBADMSG; 6428 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6_INLINE, 6429 param, param_len); 6430 if (!err) 6431 bpf_update_srh_state(skb); 6432 6433 return err; 6434 case SEG6_LOCAL_ACTION_END_B6_ENCAP: 6435 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) 6436 return -EBADMSG; 6437 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6, 6438 param, param_len); 6439 if (!err) 6440 bpf_update_srh_state(skb); 6441 6442 return err; 6443 default: 6444 return -EINVAL; 6445 } 6446 } 6447 6448 static const struct bpf_func_proto bpf_lwt_seg6_action_proto = { 6449 .func = bpf_lwt_seg6_action, 6450 .gpl_only = false, 6451 .ret_type = RET_INTEGER, 6452 .arg1_type = ARG_PTR_TO_CTX, 6453 .arg2_type = ARG_ANYTHING, 6454 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6455 .arg4_type = ARG_CONST_SIZE 6456 }; 6457 6458 BPF_CALL_3(bpf_lwt_seg6_adjust_srh, struct sk_buff *, skb, u32, offset, 6459 s32, len) 6460 { 6461 struct seg6_bpf_srh_state *srh_state = 6462 this_cpu_ptr(&seg6_bpf_srh_states); 6463 struct ipv6_sr_hdr *srh = srh_state->srh; 6464 void *srh_end, *srh_tlvs, *ptr; 6465 struct ipv6hdr *hdr; 6466 int srhoff = 0; 6467 int ret; 6468 6469 if (unlikely(srh == NULL)) 6470 return -EINVAL; 6471 6472 srh_tlvs = (void *)((unsigned char *)srh + sizeof(*srh) + 6473 ((srh->first_segment + 1) << 4)); 6474 srh_end = (void *)((unsigned char *)srh + sizeof(*srh) + 6475 srh_state->hdrlen); 6476 ptr = skb->data + offset; 6477 6478 if (unlikely(ptr < srh_tlvs || ptr > srh_end)) 6479 return -EFAULT; 6480 if (unlikely(len < 0 && (void *)((char *)ptr - len) > srh_end)) 6481 return -EFAULT; 6482 6483 if (len > 0) { 6484 ret = skb_cow_head(skb, len); 6485 if (unlikely(ret < 0)) 6486 return ret; 6487 6488 ret = bpf_skb_net_hdr_push(skb, offset, len); 6489 } else { 6490 ret = bpf_skb_net_hdr_pop(skb, offset, -1 * len); 6491 } 6492 6493 bpf_compute_data_pointers(skb); 6494 if (unlikely(ret < 0)) 6495 return ret; 6496 6497 hdr = (struct ipv6hdr *)skb->data; 6498 hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); 6499 6500 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) 6501 return -EINVAL; 6502 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 6503 srh_state->hdrlen += len; 6504 srh_state->valid = false; 6505 return 0; 6506 } 6507 6508 static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = { 6509 .func = bpf_lwt_seg6_adjust_srh, 6510 .gpl_only = false, 6511 .ret_type = RET_INTEGER, 6512 .arg1_type = ARG_PTR_TO_CTX, 6513 .arg2_type = ARG_ANYTHING, 6514 .arg3_type = ARG_ANYTHING, 6515 }; 6516 #endif /* CONFIG_IPV6_SEG6_BPF */ 6517 6518 #ifdef CONFIG_INET 6519 static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple, 6520 int dif, int sdif, u8 family, u8 proto) 6521 { 6522 struct inet_hashinfo *hinfo = net->ipv4.tcp_death_row.hashinfo; 6523 bool refcounted = false; 6524 struct sock *sk = NULL; 6525 6526 if (family == AF_INET) { 6527 __be32 src4 = tuple->ipv4.saddr; 6528 __be32 dst4 = tuple->ipv4.daddr; 6529 6530 if (proto == IPPROTO_TCP) 6531 sk = __inet_lookup(net, hinfo, NULL, 0, 6532 src4, tuple->ipv4.sport, 6533 dst4, tuple->ipv4.dport, 6534 dif, sdif, &refcounted); 6535 else 6536 sk = __udp4_lib_lookup(net, src4, tuple->ipv4.sport, 6537 dst4, tuple->ipv4.dport, 6538 dif, sdif, net->ipv4.udp_table, NULL); 6539 #if IS_ENABLED(CONFIG_IPV6) 6540 } else { 6541 struct in6_addr *src6 = (struct in6_addr *)&tuple->ipv6.saddr; 6542 struct in6_addr *dst6 = (struct in6_addr *)&tuple->ipv6.daddr; 6543 6544 if (proto == IPPROTO_TCP) 6545 sk = __inet6_lookup(net, hinfo, NULL, 0, 6546 src6, tuple->ipv6.sport, 6547 dst6, ntohs(tuple->ipv6.dport), 6548 dif, sdif, &refcounted); 6549 else if (likely(ipv6_bpf_stub)) 6550 sk = ipv6_bpf_stub->udp6_lib_lookup(net, 6551 src6, tuple->ipv6.sport, 6552 dst6, tuple->ipv6.dport, 6553 dif, sdif, 6554 net->ipv4.udp_table, NULL); 6555 #endif 6556 } 6557 6558 if (unlikely(sk && !refcounted && !sock_flag(sk, SOCK_RCU_FREE))) { 6559 WARN_ONCE(1, "Found non-RCU, unreferenced socket!"); 6560 sk = NULL; 6561 } 6562 return sk; 6563 } 6564 6565 /* bpf_skc_lookup performs the core lookup for different types of sockets, 6566 * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE. 6567 */ 6568 static struct sock * 6569 __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6570 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, 6571 u64 flags, int sdif) 6572 { 6573 struct sock *sk = NULL; 6574 struct net *net; 6575 u8 family; 6576 6577 if (len == sizeof(tuple->ipv4)) 6578 family = AF_INET; 6579 else if (len == sizeof(tuple->ipv6)) 6580 family = AF_INET6; 6581 else 6582 return NULL; 6583 6584 if (unlikely(flags || !((s32)netns_id < 0 || netns_id <= S32_MAX))) 6585 goto out; 6586 6587 if (sdif < 0) { 6588 if (family == AF_INET) 6589 sdif = inet_sdif(skb); 6590 else 6591 sdif = inet6_sdif(skb); 6592 } 6593 6594 if ((s32)netns_id < 0) { 6595 net = caller_net; 6596 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); 6597 } else { 6598 net = get_net_ns_by_id(caller_net, netns_id); 6599 if (unlikely(!net)) 6600 goto out; 6601 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); 6602 put_net(net); 6603 } 6604 6605 out: 6606 return sk; 6607 } 6608 6609 static struct sock * 6610 __bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6611 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, 6612 u64 flags, int sdif) 6613 { 6614 struct sock *sk = __bpf_skc_lookup(skb, tuple, len, caller_net, 6615 ifindex, proto, netns_id, flags, 6616 sdif); 6617 6618 if (sk) { 6619 struct sock *sk2 = sk_to_full_sk(sk); 6620 6621 /* sk_to_full_sk() may return (sk)->rsk_listener, so make sure the original sk 6622 * sock refcnt is decremented to prevent a request_sock leak. 6623 */ 6624 if (!sk_fullsock(sk2)) 6625 sk2 = NULL; 6626 if (sk2 != sk) { 6627 sock_gen_put(sk); 6628 /* Ensure there is no need to bump sk2 refcnt */ 6629 if (unlikely(sk2 && !sock_flag(sk2, SOCK_RCU_FREE))) { 6630 WARN_ONCE(1, "Found non-RCU, unreferenced socket!"); 6631 return NULL; 6632 } 6633 sk = sk2; 6634 } 6635 } 6636 6637 return sk; 6638 } 6639 6640 static struct sock * 6641 bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6642 u8 proto, u64 netns_id, u64 flags) 6643 { 6644 struct net *caller_net; 6645 int ifindex; 6646 6647 if (skb->dev) { 6648 caller_net = dev_net(skb->dev); 6649 ifindex = skb->dev->ifindex; 6650 } else { 6651 caller_net = sock_net(skb->sk); 6652 ifindex = 0; 6653 } 6654 6655 return __bpf_skc_lookup(skb, tuple, len, caller_net, ifindex, proto, 6656 netns_id, flags, -1); 6657 } 6658 6659 static struct sock * 6660 bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6661 u8 proto, u64 netns_id, u64 flags) 6662 { 6663 struct sock *sk = bpf_skc_lookup(skb, tuple, len, proto, netns_id, 6664 flags); 6665 6666 if (sk) { 6667 struct sock *sk2 = sk_to_full_sk(sk); 6668 6669 /* sk_to_full_sk() may return (sk)->rsk_listener, so make sure the original sk 6670 * sock refcnt is decremented to prevent a request_sock leak. 6671 */ 6672 if (!sk_fullsock(sk2)) 6673 sk2 = NULL; 6674 if (sk2 != sk) { 6675 sock_gen_put(sk); 6676 /* Ensure there is no need to bump sk2 refcnt */ 6677 if (unlikely(sk2 && !sock_flag(sk2, SOCK_RCU_FREE))) { 6678 WARN_ONCE(1, "Found non-RCU, unreferenced socket!"); 6679 return NULL; 6680 } 6681 sk = sk2; 6682 } 6683 } 6684 6685 return sk; 6686 } 6687 6688 BPF_CALL_5(bpf_skc_lookup_tcp, struct sk_buff *, skb, 6689 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6690 { 6691 return (unsigned long)bpf_skc_lookup(skb, tuple, len, IPPROTO_TCP, 6692 netns_id, flags); 6693 } 6694 6695 static const struct bpf_func_proto bpf_skc_lookup_tcp_proto = { 6696 .func = bpf_skc_lookup_tcp, 6697 .gpl_only = false, 6698 .pkt_access = true, 6699 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 6700 .arg1_type = ARG_PTR_TO_CTX, 6701 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6702 .arg3_type = ARG_CONST_SIZE, 6703 .arg4_type = ARG_ANYTHING, 6704 .arg5_type = ARG_ANYTHING, 6705 }; 6706 6707 BPF_CALL_5(bpf_sk_lookup_tcp, struct sk_buff *, skb, 6708 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6709 { 6710 return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP, 6711 netns_id, flags); 6712 } 6713 6714 static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = { 6715 .func = bpf_sk_lookup_tcp, 6716 .gpl_only = false, 6717 .pkt_access = true, 6718 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6719 .arg1_type = ARG_PTR_TO_CTX, 6720 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6721 .arg3_type = ARG_CONST_SIZE, 6722 .arg4_type = ARG_ANYTHING, 6723 .arg5_type = ARG_ANYTHING, 6724 }; 6725 6726 BPF_CALL_5(bpf_sk_lookup_udp, struct sk_buff *, skb, 6727 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6728 { 6729 return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP, 6730 netns_id, flags); 6731 } 6732 6733 static const struct bpf_func_proto bpf_sk_lookup_udp_proto = { 6734 .func = bpf_sk_lookup_udp, 6735 .gpl_only = false, 6736 .pkt_access = true, 6737 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6738 .arg1_type = ARG_PTR_TO_CTX, 6739 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6740 .arg3_type = ARG_CONST_SIZE, 6741 .arg4_type = ARG_ANYTHING, 6742 .arg5_type = ARG_ANYTHING, 6743 }; 6744 6745 BPF_CALL_5(bpf_tc_skc_lookup_tcp, struct sk_buff *, skb, 6746 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6747 { 6748 struct net_device *dev = skb->dev; 6749 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6750 struct net *caller_net = dev_net(dev); 6751 6752 return (unsigned long)__bpf_skc_lookup(skb, tuple, len, caller_net, 6753 ifindex, IPPROTO_TCP, netns_id, 6754 flags, sdif); 6755 } 6756 6757 static const struct bpf_func_proto bpf_tc_skc_lookup_tcp_proto = { 6758 .func = bpf_tc_skc_lookup_tcp, 6759 .gpl_only = false, 6760 .pkt_access = true, 6761 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 6762 .arg1_type = ARG_PTR_TO_CTX, 6763 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6764 .arg3_type = ARG_CONST_SIZE, 6765 .arg4_type = ARG_ANYTHING, 6766 .arg5_type = ARG_ANYTHING, 6767 }; 6768 6769 BPF_CALL_5(bpf_tc_sk_lookup_tcp, struct sk_buff *, skb, 6770 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6771 { 6772 struct net_device *dev = skb->dev; 6773 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6774 struct net *caller_net = dev_net(dev); 6775 6776 return (unsigned long)__bpf_sk_lookup(skb, tuple, len, caller_net, 6777 ifindex, IPPROTO_TCP, netns_id, 6778 flags, sdif); 6779 } 6780 6781 static const struct bpf_func_proto bpf_tc_sk_lookup_tcp_proto = { 6782 .func = bpf_tc_sk_lookup_tcp, 6783 .gpl_only = false, 6784 .pkt_access = true, 6785 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6786 .arg1_type = ARG_PTR_TO_CTX, 6787 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6788 .arg3_type = ARG_CONST_SIZE, 6789 .arg4_type = ARG_ANYTHING, 6790 .arg5_type = ARG_ANYTHING, 6791 }; 6792 6793 BPF_CALL_5(bpf_tc_sk_lookup_udp, struct sk_buff *, skb, 6794 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6795 { 6796 struct net_device *dev = skb->dev; 6797 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6798 struct net *caller_net = dev_net(dev); 6799 6800 return (unsigned long)__bpf_sk_lookup(skb, tuple, len, caller_net, 6801 ifindex, IPPROTO_UDP, netns_id, 6802 flags, sdif); 6803 } 6804 6805 static const struct bpf_func_proto bpf_tc_sk_lookup_udp_proto = { 6806 .func = bpf_tc_sk_lookup_udp, 6807 .gpl_only = false, 6808 .pkt_access = true, 6809 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6810 .arg1_type = ARG_PTR_TO_CTX, 6811 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6812 .arg3_type = ARG_CONST_SIZE, 6813 .arg4_type = ARG_ANYTHING, 6814 .arg5_type = ARG_ANYTHING, 6815 }; 6816 6817 BPF_CALL_1(bpf_sk_release, struct sock *, sk) 6818 { 6819 if (sk && sk_is_refcounted(sk)) 6820 sock_gen_put(sk); 6821 return 0; 6822 } 6823 6824 static const struct bpf_func_proto bpf_sk_release_proto = { 6825 .func = bpf_sk_release, 6826 .gpl_only = false, 6827 .ret_type = RET_INTEGER, 6828 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON | OBJ_RELEASE, 6829 }; 6830 6831 BPF_CALL_5(bpf_xdp_sk_lookup_udp, struct xdp_buff *, ctx, 6832 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 6833 { 6834 struct net_device *dev = ctx->rxq->dev; 6835 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6836 struct net *caller_net = dev_net(dev); 6837 6838 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, 6839 ifindex, IPPROTO_UDP, netns_id, 6840 flags, sdif); 6841 } 6842 6843 static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = { 6844 .func = bpf_xdp_sk_lookup_udp, 6845 .gpl_only = false, 6846 .pkt_access = true, 6847 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6848 .arg1_type = ARG_PTR_TO_CTX, 6849 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6850 .arg3_type = ARG_CONST_SIZE, 6851 .arg4_type = ARG_ANYTHING, 6852 .arg5_type = ARG_ANYTHING, 6853 }; 6854 6855 BPF_CALL_5(bpf_xdp_skc_lookup_tcp, struct xdp_buff *, ctx, 6856 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 6857 { 6858 struct net_device *dev = ctx->rxq->dev; 6859 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6860 struct net *caller_net = dev_net(dev); 6861 6862 return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, caller_net, 6863 ifindex, IPPROTO_TCP, netns_id, 6864 flags, sdif); 6865 } 6866 6867 static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto = { 6868 .func = bpf_xdp_skc_lookup_tcp, 6869 .gpl_only = false, 6870 .pkt_access = true, 6871 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 6872 .arg1_type = ARG_PTR_TO_CTX, 6873 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6874 .arg3_type = ARG_CONST_SIZE, 6875 .arg4_type = ARG_ANYTHING, 6876 .arg5_type = ARG_ANYTHING, 6877 }; 6878 6879 BPF_CALL_5(bpf_xdp_sk_lookup_tcp, struct xdp_buff *, ctx, 6880 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 6881 { 6882 struct net_device *dev = ctx->rxq->dev; 6883 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6884 struct net *caller_net = dev_net(dev); 6885 6886 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, 6887 ifindex, IPPROTO_TCP, netns_id, 6888 flags, sdif); 6889 } 6890 6891 static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = { 6892 .func = bpf_xdp_sk_lookup_tcp, 6893 .gpl_only = false, 6894 .pkt_access = true, 6895 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6896 .arg1_type = ARG_PTR_TO_CTX, 6897 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6898 .arg3_type = ARG_CONST_SIZE, 6899 .arg4_type = ARG_ANYTHING, 6900 .arg5_type = ARG_ANYTHING, 6901 }; 6902 6903 BPF_CALL_5(bpf_sock_addr_skc_lookup_tcp, struct bpf_sock_addr_kern *, ctx, 6904 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6905 { 6906 return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, 6907 sock_net(ctx->sk), 0, 6908 IPPROTO_TCP, netns_id, flags, 6909 -1); 6910 } 6911 6912 static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto = { 6913 .func = bpf_sock_addr_skc_lookup_tcp, 6914 .gpl_only = false, 6915 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 6916 .arg1_type = ARG_PTR_TO_CTX, 6917 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6918 .arg3_type = ARG_CONST_SIZE, 6919 .arg4_type = ARG_ANYTHING, 6920 .arg5_type = ARG_ANYTHING, 6921 }; 6922 6923 BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp, struct bpf_sock_addr_kern *, ctx, 6924 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6925 { 6926 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, 6927 sock_net(ctx->sk), 0, IPPROTO_TCP, 6928 netns_id, flags, -1); 6929 } 6930 6931 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = { 6932 .func = bpf_sock_addr_sk_lookup_tcp, 6933 .gpl_only = false, 6934 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6935 .arg1_type = ARG_PTR_TO_CTX, 6936 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6937 .arg3_type = ARG_CONST_SIZE, 6938 .arg4_type = ARG_ANYTHING, 6939 .arg5_type = ARG_ANYTHING, 6940 }; 6941 6942 BPF_CALL_5(bpf_sock_addr_sk_lookup_udp, struct bpf_sock_addr_kern *, ctx, 6943 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6944 { 6945 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, 6946 sock_net(ctx->sk), 0, IPPROTO_UDP, 6947 netns_id, flags, -1); 6948 } 6949 6950 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = { 6951 .func = bpf_sock_addr_sk_lookup_udp, 6952 .gpl_only = false, 6953 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6954 .arg1_type = ARG_PTR_TO_CTX, 6955 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6956 .arg3_type = ARG_CONST_SIZE, 6957 .arg4_type = ARG_ANYTHING, 6958 .arg5_type = ARG_ANYTHING, 6959 }; 6960 6961 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 6962 struct bpf_insn_access_aux *info) 6963 { 6964 if (off < 0 || off >= offsetofend(struct bpf_tcp_sock, 6965 icsk_retransmits)) 6966 return false; 6967 6968 if (off % size != 0) 6969 return false; 6970 6971 switch (off) { 6972 case offsetof(struct bpf_tcp_sock, bytes_received): 6973 case offsetof(struct bpf_tcp_sock, bytes_acked): 6974 return size == sizeof(__u64); 6975 default: 6976 return size == sizeof(__u32); 6977 } 6978 } 6979 6980 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 6981 const struct bpf_insn *si, 6982 struct bpf_insn *insn_buf, 6983 struct bpf_prog *prog, u32 *target_size) 6984 { 6985 struct bpf_insn *insn = insn_buf; 6986 6987 #define BPF_TCP_SOCK_GET_COMMON(FIELD) \ 6988 do { \ 6989 BUILD_BUG_ON(sizeof_field(struct tcp_sock, FIELD) > \ 6990 sizeof_field(struct bpf_tcp_sock, FIELD)); \ 6991 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_sock, FIELD),\ 6992 si->dst_reg, si->src_reg, \ 6993 offsetof(struct tcp_sock, FIELD)); \ 6994 } while (0) 6995 6996 #define BPF_INET_SOCK_GET_COMMON(FIELD) \ 6997 do { \ 6998 BUILD_BUG_ON(sizeof_field(struct inet_connection_sock, \ 6999 FIELD) > \ 7000 sizeof_field(struct bpf_tcp_sock, FIELD)); \ 7001 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 7002 struct inet_connection_sock, \ 7003 FIELD), \ 7004 si->dst_reg, si->src_reg, \ 7005 offsetof( \ 7006 struct inet_connection_sock, \ 7007 FIELD)); \ 7008 } while (0) 7009 7010 BTF_TYPE_EMIT(struct bpf_tcp_sock); 7011 7012 switch (si->off) { 7013 case offsetof(struct bpf_tcp_sock, rtt_min): 7014 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) != 7015 sizeof(struct minmax)); 7016 BUILD_BUG_ON(sizeof(struct minmax) < 7017 sizeof(struct minmax_sample)); 7018 7019 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7020 offsetof(struct tcp_sock, rtt_min) + 7021 offsetof(struct minmax_sample, v)); 7022 break; 7023 case offsetof(struct bpf_tcp_sock, snd_cwnd): 7024 BPF_TCP_SOCK_GET_COMMON(snd_cwnd); 7025 break; 7026 case offsetof(struct bpf_tcp_sock, srtt_us): 7027 BPF_TCP_SOCK_GET_COMMON(srtt_us); 7028 break; 7029 case offsetof(struct bpf_tcp_sock, snd_ssthresh): 7030 BPF_TCP_SOCK_GET_COMMON(snd_ssthresh); 7031 break; 7032 case offsetof(struct bpf_tcp_sock, rcv_nxt): 7033 BPF_TCP_SOCK_GET_COMMON(rcv_nxt); 7034 break; 7035 case offsetof(struct bpf_tcp_sock, snd_nxt): 7036 BPF_TCP_SOCK_GET_COMMON(snd_nxt); 7037 break; 7038 case offsetof(struct bpf_tcp_sock, snd_una): 7039 BPF_TCP_SOCK_GET_COMMON(snd_una); 7040 break; 7041 case offsetof(struct bpf_tcp_sock, mss_cache): 7042 BPF_TCP_SOCK_GET_COMMON(mss_cache); 7043 break; 7044 case offsetof(struct bpf_tcp_sock, ecn_flags): 7045 BPF_TCP_SOCK_GET_COMMON(ecn_flags); 7046 break; 7047 case offsetof(struct bpf_tcp_sock, rate_delivered): 7048 BPF_TCP_SOCK_GET_COMMON(rate_delivered); 7049 break; 7050 case offsetof(struct bpf_tcp_sock, rate_interval_us): 7051 BPF_TCP_SOCK_GET_COMMON(rate_interval_us); 7052 break; 7053 case offsetof(struct bpf_tcp_sock, packets_out): 7054 BPF_TCP_SOCK_GET_COMMON(packets_out); 7055 break; 7056 case offsetof(struct bpf_tcp_sock, retrans_out): 7057 BPF_TCP_SOCK_GET_COMMON(retrans_out); 7058 break; 7059 case offsetof(struct bpf_tcp_sock, total_retrans): 7060 BPF_TCP_SOCK_GET_COMMON(total_retrans); 7061 break; 7062 case offsetof(struct bpf_tcp_sock, segs_in): 7063 BPF_TCP_SOCK_GET_COMMON(segs_in); 7064 break; 7065 case offsetof(struct bpf_tcp_sock, data_segs_in): 7066 BPF_TCP_SOCK_GET_COMMON(data_segs_in); 7067 break; 7068 case offsetof(struct bpf_tcp_sock, segs_out): 7069 BPF_TCP_SOCK_GET_COMMON(segs_out); 7070 break; 7071 case offsetof(struct bpf_tcp_sock, data_segs_out): 7072 BPF_TCP_SOCK_GET_COMMON(data_segs_out); 7073 break; 7074 case offsetof(struct bpf_tcp_sock, lost_out): 7075 BPF_TCP_SOCK_GET_COMMON(lost_out); 7076 break; 7077 case offsetof(struct bpf_tcp_sock, sacked_out): 7078 BPF_TCP_SOCK_GET_COMMON(sacked_out); 7079 break; 7080 case offsetof(struct bpf_tcp_sock, bytes_received): 7081 BPF_TCP_SOCK_GET_COMMON(bytes_received); 7082 break; 7083 case offsetof(struct bpf_tcp_sock, bytes_acked): 7084 BPF_TCP_SOCK_GET_COMMON(bytes_acked); 7085 break; 7086 case offsetof(struct bpf_tcp_sock, dsack_dups): 7087 BPF_TCP_SOCK_GET_COMMON(dsack_dups); 7088 break; 7089 case offsetof(struct bpf_tcp_sock, delivered): 7090 BPF_TCP_SOCK_GET_COMMON(delivered); 7091 break; 7092 case offsetof(struct bpf_tcp_sock, delivered_ce): 7093 BPF_TCP_SOCK_GET_COMMON(delivered_ce); 7094 break; 7095 case offsetof(struct bpf_tcp_sock, icsk_retransmits): 7096 BPF_INET_SOCK_GET_COMMON(icsk_retransmits); 7097 break; 7098 } 7099 7100 return insn - insn_buf; 7101 } 7102 7103 BPF_CALL_1(bpf_tcp_sock, struct sock *, sk) 7104 { 7105 if (sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP) 7106 return (unsigned long)sk; 7107 7108 return (unsigned long)NULL; 7109 } 7110 7111 const struct bpf_func_proto bpf_tcp_sock_proto = { 7112 .func = bpf_tcp_sock, 7113 .gpl_only = false, 7114 .ret_type = RET_PTR_TO_TCP_SOCK_OR_NULL, 7115 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 7116 }; 7117 7118 BPF_CALL_1(bpf_get_listener_sock, struct sock *, sk) 7119 { 7120 sk = sk_to_full_sk(sk); 7121 7122 if (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_RCU_FREE)) 7123 return (unsigned long)sk; 7124 7125 return (unsigned long)NULL; 7126 } 7127 7128 static const struct bpf_func_proto bpf_get_listener_sock_proto = { 7129 .func = bpf_get_listener_sock, 7130 .gpl_only = false, 7131 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 7132 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 7133 }; 7134 7135 BPF_CALL_1(bpf_skb_ecn_set_ce, struct sk_buff *, skb) 7136 { 7137 unsigned int iphdr_len; 7138 7139 switch (skb_protocol(skb, true)) { 7140 case cpu_to_be16(ETH_P_IP): 7141 iphdr_len = sizeof(struct iphdr); 7142 break; 7143 case cpu_to_be16(ETH_P_IPV6): 7144 iphdr_len = sizeof(struct ipv6hdr); 7145 break; 7146 default: 7147 return 0; 7148 } 7149 7150 if (skb_headlen(skb) < iphdr_len) 7151 return 0; 7152 7153 if (skb_cloned(skb) && !skb_clone_writable(skb, iphdr_len)) 7154 return 0; 7155 7156 return INET_ECN_set_ce(skb); 7157 } 7158 7159 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 7160 struct bpf_insn_access_aux *info) 7161 { 7162 if (off < 0 || off >= offsetofend(struct bpf_xdp_sock, queue_id)) 7163 return false; 7164 7165 if (off % size != 0) 7166 return false; 7167 7168 switch (off) { 7169 default: 7170 return size == sizeof(__u32); 7171 } 7172 } 7173 7174 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 7175 const struct bpf_insn *si, 7176 struct bpf_insn *insn_buf, 7177 struct bpf_prog *prog, u32 *target_size) 7178 { 7179 struct bpf_insn *insn = insn_buf; 7180 7181 #define BPF_XDP_SOCK_GET(FIELD) \ 7182 do { \ 7183 BUILD_BUG_ON(sizeof_field(struct xdp_sock, FIELD) > \ 7184 sizeof_field(struct bpf_xdp_sock, FIELD)); \ 7185 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_sock, FIELD),\ 7186 si->dst_reg, si->src_reg, \ 7187 offsetof(struct xdp_sock, FIELD)); \ 7188 } while (0) 7189 7190 switch (si->off) { 7191 case offsetof(struct bpf_xdp_sock, queue_id): 7192 BPF_XDP_SOCK_GET(queue_id); 7193 break; 7194 } 7195 7196 return insn - insn_buf; 7197 } 7198 7199 static const struct bpf_func_proto bpf_skb_ecn_set_ce_proto = { 7200 .func = bpf_skb_ecn_set_ce, 7201 .gpl_only = false, 7202 .ret_type = RET_INTEGER, 7203 .arg1_type = ARG_PTR_TO_CTX, 7204 }; 7205 7206 BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len, 7207 struct tcphdr *, th, u32, th_len) 7208 { 7209 #ifdef CONFIG_SYN_COOKIES 7210 u32 cookie; 7211 int ret; 7212 7213 if (unlikely(!sk || th_len < sizeof(*th))) 7214 return -EINVAL; 7215 7216 /* sk_listener() allows TCP_NEW_SYN_RECV, which makes no sense here. */ 7217 if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN) 7218 return -EINVAL; 7219 7220 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_syncookies)) 7221 return -EINVAL; 7222 7223 if (!th->ack || th->rst || th->syn) 7224 return -ENOENT; 7225 7226 if (unlikely(iph_len < sizeof(struct iphdr))) 7227 return -EINVAL; 7228 7229 if (tcp_synq_no_recent_overflow(sk)) 7230 return -ENOENT; 7231 7232 cookie = ntohl(th->ack_seq) - 1; 7233 7234 /* Both struct iphdr and struct ipv6hdr have the version field at the 7235 * same offset so we can cast to the shorter header (struct iphdr). 7236 */ 7237 switch (((struct iphdr *)iph)->version) { 7238 case 4: 7239 if (sk->sk_family == AF_INET6 && ipv6_only_sock(sk)) 7240 return -EINVAL; 7241 7242 ret = __cookie_v4_check((struct iphdr *)iph, th, cookie); 7243 break; 7244 7245 #if IS_BUILTIN(CONFIG_IPV6) 7246 case 6: 7247 if (unlikely(iph_len < sizeof(struct ipv6hdr))) 7248 return -EINVAL; 7249 7250 if (sk->sk_family != AF_INET6) 7251 return -EINVAL; 7252 7253 ret = __cookie_v6_check((struct ipv6hdr *)iph, th, cookie); 7254 break; 7255 #endif /* CONFIG_IPV6 */ 7256 7257 default: 7258 return -EPROTONOSUPPORT; 7259 } 7260 7261 if (ret > 0) 7262 return 0; 7263 7264 return -ENOENT; 7265 #else 7266 return -ENOTSUPP; 7267 #endif 7268 } 7269 7270 static const struct bpf_func_proto bpf_tcp_check_syncookie_proto = { 7271 .func = bpf_tcp_check_syncookie, 7272 .gpl_only = true, 7273 .pkt_access = true, 7274 .ret_type = RET_INTEGER, 7275 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 7276 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7277 .arg3_type = ARG_CONST_SIZE, 7278 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7279 .arg5_type = ARG_CONST_SIZE, 7280 }; 7281 7282 BPF_CALL_5(bpf_tcp_gen_syncookie, struct sock *, sk, void *, iph, u32, iph_len, 7283 struct tcphdr *, th, u32, th_len) 7284 { 7285 #ifdef CONFIG_SYN_COOKIES 7286 u32 cookie; 7287 u16 mss; 7288 7289 if (unlikely(!sk || th_len < sizeof(*th) || th_len != th->doff * 4)) 7290 return -EINVAL; 7291 7292 if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN) 7293 return -EINVAL; 7294 7295 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_syncookies)) 7296 return -ENOENT; 7297 7298 if (!th->syn || th->ack || th->fin || th->rst) 7299 return -EINVAL; 7300 7301 if (unlikely(iph_len < sizeof(struct iphdr))) 7302 return -EINVAL; 7303 7304 /* Both struct iphdr and struct ipv6hdr have the version field at the 7305 * same offset so we can cast to the shorter header (struct iphdr). 7306 */ 7307 switch (((struct iphdr *)iph)->version) { 7308 case 4: 7309 if (sk->sk_family == AF_INET6 && ipv6_only_sock(sk)) 7310 return -EINVAL; 7311 7312 mss = tcp_v4_get_syncookie(sk, iph, th, &cookie); 7313 break; 7314 7315 #if IS_BUILTIN(CONFIG_IPV6) 7316 case 6: 7317 if (unlikely(iph_len < sizeof(struct ipv6hdr))) 7318 return -EINVAL; 7319 7320 if (sk->sk_family != AF_INET6) 7321 return -EINVAL; 7322 7323 mss = tcp_v6_get_syncookie(sk, iph, th, &cookie); 7324 break; 7325 #endif /* CONFIG_IPV6 */ 7326 7327 default: 7328 return -EPROTONOSUPPORT; 7329 } 7330 if (mss == 0) 7331 return -ENOENT; 7332 7333 return cookie | ((u64)mss << 32); 7334 #else 7335 return -EOPNOTSUPP; 7336 #endif /* CONFIG_SYN_COOKIES */ 7337 } 7338 7339 static const struct bpf_func_proto bpf_tcp_gen_syncookie_proto = { 7340 .func = bpf_tcp_gen_syncookie, 7341 .gpl_only = true, /* __cookie_v*_init_sequence() is GPL */ 7342 .pkt_access = true, 7343 .ret_type = RET_INTEGER, 7344 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 7345 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7346 .arg3_type = ARG_CONST_SIZE, 7347 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7348 .arg5_type = ARG_CONST_SIZE, 7349 }; 7350 7351 BPF_CALL_3(bpf_sk_assign, struct sk_buff *, skb, struct sock *, sk, u64, flags) 7352 { 7353 if (!sk || flags != 0) 7354 return -EINVAL; 7355 if (!skb_at_tc_ingress(skb)) 7356 return -EOPNOTSUPP; 7357 if (unlikely(dev_net(skb->dev) != sock_net(sk))) 7358 return -ENETUNREACH; 7359 if (unlikely(sk_fullsock(sk) && sk->sk_reuseport)) 7360 return -ESOCKTNOSUPPORT; 7361 if (sk_is_refcounted(sk) && 7362 unlikely(!refcount_inc_not_zero(&sk->sk_refcnt))) 7363 return -ENOENT; 7364 7365 skb_orphan(skb); 7366 skb->sk = sk; 7367 skb->destructor = sock_pfree; 7368 7369 return 0; 7370 } 7371 7372 static const struct bpf_func_proto bpf_sk_assign_proto = { 7373 .func = bpf_sk_assign, 7374 .gpl_only = false, 7375 .ret_type = RET_INTEGER, 7376 .arg1_type = ARG_PTR_TO_CTX, 7377 .arg2_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 7378 .arg3_type = ARG_ANYTHING, 7379 }; 7380 7381 static const u8 *bpf_search_tcp_opt(const u8 *op, const u8 *opend, 7382 u8 search_kind, const u8 *magic, 7383 u8 magic_len, bool *eol) 7384 { 7385 u8 kind, kind_len; 7386 7387 *eol = false; 7388 7389 while (op < opend) { 7390 kind = op[0]; 7391 7392 if (kind == TCPOPT_EOL) { 7393 *eol = true; 7394 return ERR_PTR(-ENOMSG); 7395 } else if (kind == TCPOPT_NOP) { 7396 op++; 7397 continue; 7398 } 7399 7400 if (opend - op < 2 || opend - op < op[1] || op[1] < 2) 7401 /* Something is wrong in the received header. 7402 * Follow the TCP stack's tcp_parse_options() 7403 * and just bail here. 7404 */ 7405 return ERR_PTR(-EFAULT); 7406 7407 kind_len = op[1]; 7408 if (search_kind == kind) { 7409 if (!magic_len) 7410 return op; 7411 7412 if (magic_len > kind_len - 2) 7413 return ERR_PTR(-ENOMSG); 7414 7415 if (!memcmp(&op[2], magic, magic_len)) 7416 return op; 7417 } 7418 7419 op += kind_len; 7420 } 7421 7422 return ERR_PTR(-ENOMSG); 7423 } 7424 7425 BPF_CALL_4(bpf_sock_ops_load_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock, 7426 void *, search_res, u32, len, u64, flags) 7427 { 7428 bool eol, load_syn = flags & BPF_LOAD_HDR_OPT_TCP_SYN; 7429 const u8 *op, *opend, *magic, *search = search_res; 7430 u8 search_kind, search_len, copy_len, magic_len; 7431 int ret; 7432 7433 /* 2 byte is the minimal option len except TCPOPT_NOP and 7434 * TCPOPT_EOL which are useless for the bpf prog to learn 7435 * and this helper disallow loading them also. 7436 */ 7437 if (len < 2 || flags & ~BPF_LOAD_HDR_OPT_TCP_SYN) 7438 return -EINVAL; 7439 7440 search_kind = search[0]; 7441 search_len = search[1]; 7442 7443 if (search_len > len || search_kind == TCPOPT_NOP || 7444 search_kind == TCPOPT_EOL) 7445 return -EINVAL; 7446 7447 if (search_kind == TCPOPT_EXP || search_kind == 253) { 7448 /* 16 or 32 bit magic. +2 for kind and kind length */ 7449 if (search_len != 4 && search_len != 6) 7450 return -EINVAL; 7451 magic = &search[2]; 7452 magic_len = search_len - 2; 7453 } else { 7454 if (search_len) 7455 return -EINVAL; 7456 magic = NULL; 7457 magic_len = 0; 7458 } 7459 7460 if (load_syn) { 7461 ret = bpf_sock_ops_get_syn(bpf_sock, TCP_BPF_SYN, &op); 7462 if (ret < 0) 7463 return ret; 7464 7465 opend = op + ret; 7466 op += sizeof(struct tcphdr); 7467 } else { 7468 if (!bpf_sock->skb || 7469 bpf_sock->op == BPF_SOCK_OPS_HDR_OPT_LEN_CB) 7470 /* This bpf_sock->op cannot call this helper */ 7471 return -EPERM; 7472 7473 opend = bpf_sock->skb_data_end; 7474 op = bpf_sock->skb->data + sizeof(struct tcphdr); 7475 } 7476 7477 op = bpf_search_tcp_opt(op, opend, search_kind, magic, magic_len, 7478 &eol); 7479 if (IS_ERR(op)) 7480 return PTR_ERR(op); 7481 7482 copy_len = op[1]; 7483 ret = copy_len; 7484 if (copy_len > len) { 7485 ret = -ENOSPC; 7486 copy_len = len; 7487 } 7488 7489 memcpy(search_res, op, copy_len); 7490 return ret; 7491 } 7492 7493 static const struct bpf_func_proto bpf_sock_ops_load_hdr_opt_proto = { 7494 .func = bpf_sock_ops_load_hdr_opt, 7495 .gpl_only = false, 7496 .ret_type = RET_INTEGER, 7497 .arg1_type = ARG_PTR_TO_CTX, 7498 .arg2_type = ARG_PTR_TO_MEM, 7499 .arg3_type = ARG_CONST_SIZE, 7500 .arg4_type = ARG_ANYTHING, 7501 }; 7502 7503 BPF_CALL_4(bpf_sock_ops_store_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock, 7504 const void *, from, u32, len, u64, flags) 7505 { 7506 u8 new_kind, new_kind_len, magic_len = 0, *opend; 7507 const u8 *op, *new_op, *magic = NULL; 7508 struct sk_buff *skb; 7509 bool eol; 7510 7511 if (bpf_sock->op != BPF_SOCK_OPS_WRITE_HDR_OPT_CB) 7512 return -EPERM; 7513 7514 if (len < 2 || flags) 7515 return -EINVAL; 7516 7517 new_op = from; 7518 new_kind = new_op[0]; 7519 new_kind_len = new_op[1]; 7520 7521 if (new_kind_len > len || new_kind == TCPOPT_NOP || 7522 new_kind == TCPOPT_EOL) 7523 return -EINVAL; 7524 7525 if (new_kind_len > bpf_sock->remaining_opt_len) 7526 return -ENOSPC; 7527 7528 /* 253 is another experimental kind */ 7529 if (new_kind == TCPOPT_EXP || new_kind == 253) { 7530 if (new_kind_len < 4) 7531 return -EINVAL; 7532 /* Match for the 2 byte magic also. 7533 * RFC 6994: the magic could be 2 or 4 bytes. 7534 * Hence, matching by 2 byte only is on the 7535 * conservative side but it is the right 7536 * thing to do for the 'search-for-duplication' 7537 * purpose. 7538 */ 7539 magic = &new_op[2]; 7540 magic_len = 2; 7541 } 7542 7543 /* Check for duplication */ 7544 skb = bpf_sock->skb; 7545 op = skb->data + sizeof(struct tcphdr); 7546 opend = bpf_sock->skb_data_end; 7547 7548 op = bpf_search_tcp_opt(op, opend, new_kind, magic, magic_len, 7549 &eol); 7550 if (!IS_ERR(op)) 7551 return -EEXIST; 7552 7553 if (PTR_ERR(op) != -ENOMSG) 7554 return PTR_ERR(op); 7555 7556 if (eol) 7557 /* The option has been ended. Treat it as no more 7558 * header option can be written. 7559 */ 7560 return -ENOSPC; 7561 7562 /* No duplication found. Store the header option. */ 7563 memcpy(opend, from, new_kind_len); 7564 7565 bpf_sock->remaining_opt_len -= new_kind_len; 7566 bpf_sock->skb_data_end += new_kind_len; 7567 7568 return 0; 7569 } 7570 7571 static const struct bpf_func_proto bpf_sock_ops_store_hdr_opt_proto = { 7572 .func = bpf_sock_ops_store_hdr_opt, 7573 .gpl_only = false, 7574 .ret_type = RET_INTEGER, 7575 .arg1_type = ARG_PTR_TO_CTX, 7576 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7577 .arg3_type = ARG_CONST_SIZE, 7578 .arg4_type = ARG_ANYTHING, 7579 }; 7580 7581 BPF_CALL_3(bpf_sock_ops_reserve_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock, 7582 u32, len, u64, flags) 7583 { 7584 if (bpf_sock->op != BPF_SOCK_OPS_HDR_OPT_LEN_CB) 7585 return -EPERM; 7586 7587 if (flags || len < 2) 7588 return -EINVAL; 7589 7590 if (len > bpf_sock->remaining_opt_len) 7591 return -ENOSPC; 7592 7593 bpf_sock->remaining_opt_len -= len; 7594 7595 return 0; 7596 } 7597 7598 static const struct bpf_func_proto bpf_sock_ops_reserve_hdr_opt_proto = { 7599 .func = bpf_sock_ops_reserve_hdr_opt, 7600 .gpl_only = false, 7601 .ret_type = RET_INTEGER, 7602 .arg1_type = ARG_PTR_TO_CTX, 7603 .arg2_type = ARG_ANYTHING, 7604 .arg3_type = ARG_ANYTHING, 7605 }; 7606 7607 BPF_CALL_3(bpf_skb_set_tstamp, struct sk_buff *, skb, 7608 u64, tstamp, u32, tstamp_type) 7609 { 7610 /* skb_clear_delivery_time() is done for inet protocol */ 7611 if (skb->protocol != htons(ETH_P_IP) && 7612 skb->protocol != htons(ETH_P_IPV6)) 7613 return -EOPNOTSUPP; 7614 7615 switch (tstamp_type) { 7616 case BPF_SKB_TSTAMP_DELIVERY_MONO: 7617 if (!tstamp) 7618 return -EINVAL; 7619 skb->tstamp = tstamp; 7620 skb->mono_delivery_time = 1; 7621 break; 7622 case BPF_SKB_TSTAMP_UNSPEC: 7623 if (tstamp) 7624 return -EINVAL; 7625 skb->tstamp = 0; 7626 skb->mono_delivery_time = 0; 7627 break; 7628 default: 7629 return -EINVAL; 7630 } 7631 7632 return 0; 7633 } 7634 7635 static const struct bpf_func_proto bpf_skb_set_tstamp_proto = { 7636 .func = bpf_skb_set_tstamp, 7637 .gpl_only = false, 7638 .ret_type = RET_INTEGER, 7639 .arg1_type = ARG_PTR_TO_CTX, 7640 .arg2_type = ARG_ANYTHING, 7641 .arg3_type = ARG_ANYTHING, 7642 }; 7643 7644 #ifdef CONFIG_SYN_COOKIES 7645 BPF_CALL_3(bpf_tcp_raw_gen_syncookie_ipv4, struct iphdr *, iph, 7646 struct tcphdr *, th, u32, th_len) 7647 { 7648 u32 cookie; 7649 u16 mss; 7650 7651 if (unlikely(th_len < sizeof(*th) || th_len != th->doff * 4)) 7652 return -EINVAL; 7653 7654 mss = tcp_parse_mss_option(th, 0) ?: TCP_MSS_DEFAULT; 7655 cookie = __cookie_v4_init_sequence(iph, th, &mss); 7656 7657 return cookie | ((u64)mss << 32); 7658 } 7659 7660 static const struct bpf_func_proto bpf_tcp_raw_gen_syncookie_ipv4_proto = { 7661 .func = bpf_tcp_raw_gen_syncookie_ipv4, 7662 .gpl_only = true, /* __cookie_v4_init_sequence() is GPL */ 7663 .pkt_access = true, 7664 .ret_type = RET_INTEGER, 7665 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7666 .arg1_size = sizeof(struct iphdr), 7667 .arg2_type = ARG_PTR_TO_MEM, 7668 .arg3_type = ARG_CONST_SIZE_OR_ZERO, 7669 }; 7670 7671 BPF_CALL_3(bpf_tcp_raw_gen_syncookie_ipv6, struct ipv6hdr *, iph, 7672 struct tcphdr *, th, u32, th_len) 7673 { 7674 #if IS_BUILTIN(CONFIG_IPV6) 7675 const u16 mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - 7676 sizeof(struct ipv6hdr); 7677 u32 cookie; 7678 u16 mss; 7679 7680 if (unlikely(th_len < sizeof(*th) || th_len != th->doff * 4)) 7681 return -EINVAL; 7682 7683 mss = tcp_parse_mss_option(th, 0) ?: mss_clamp; 7684 cookie = __cookie_v6_init_sequence(iph, th, &mss); 7685 7686 return cookie | ((u64)mss << 32); 7687 #else 7688 return -EPROTONOSUPPORT; 7689 #endif 7690 } 7691 7692 static const struct bpf_func_proto bpf_tcp_raw_gen_syncookie_ipv6_proto = { 7693 .func = bpf_tcp_raw_gen_syncookie_ipv6, 7694 .gpl_only = true, /* __cookie_v6_init_sequence() is GPL */ 7695 .pkt_access = true, 7696 .ret_type = RET_INTEGER, 7697 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7698 .arg1_size = sizeof(struct ipv6hdr), 7699 .arg2_type = ARG_PTR_TO_MEM, 7700 .arg3_type = ARG_CONST_SIZE_OR_ZERO, 7701 }; 7702 7703 BPF_CALL_2(bpf_tcp_raw_check_syncookie_ipv4, struct iphdr *, iph, 7704 struct tcphdr *, th) 7705 { 7706 u32 cookie = ntohl(th->ack_seq) - 1; 7707 7708 if (__cookie_v4_check(iph, th, cookie) > 0) 7709 return 0; 7710 7711 return -EACCES; 7712 } 7713 7714 static const struct bpf_func_proto bpf_tcp_raw_check_syncookie_ipv4_proto = { 7715 .func = bpf_tcp_raw_check_syncookie_ipv4, 7716 .gpl_only = true, /* __cookie_v4_check is GPL */ 7717 .pkt_access = true, 7718 .ret_type = RET_INTEGER, 7719 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7720 .arg1_size = sizeof(struct iphdr), 7721 .arg2_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7722 .arg2_size = sizeof(struct tcphdr), 7723 }; 7724 7725 BPF_CALL_2(bpf_tcp_raw_check_syncookie_ipv6, struct ipv6hdr *, iph, 7726 struct tcphdr *, th) 7727 { 7728 #if IS_BUILTIN(CONFIG_IPV6) 7729 u32 cookie = ntohl(th->ack_seq) - 1; 7730 7731 if (__cookie_v6_check(iph, th, cookie) > 0) 7732 return 0; 7733 7734 return -EACCES; 7735 #else 7736 return -EPROTONOSUPPORT; 7737 #endif 7738 } 7739 7740 static const struct bpf_func_proto bpf_tcp_raw_check_syncookie_ipv6_proto = { 7741 .func = bpf_tcp_raw_check_syncookie_ipv6, 7742 .gpl_only = true, /* __cookie_v6_check is GPL */ 7743 .pkt_access = true, 7744 .ret_type = RET_INTEGER, 7745 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7746 .arg1_size = sizeof(struct ipv6hdr), 7747 .arg2_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7748 .arg2_size = sizeof(struct tcphdr), 7749 }; 7750 #endif /* CONFIG_SYN_COOKIES */ 7751 7752 #endif /* CONFIG_INET */ 7753 7754 bool bpf_helper_changes_pkt_data(void *func) 7755 { 7756 if (func == bpf_skb_vlan_push || 7757 func == bpf_skb_vlan_pop || 7758 func == bpf_skb_store_bytes || 7759 func == bpf_skb_change_proto || 7760 func == bpf_skb_change_head || 7761 func == sk_skb_change_head || 7762 func == bpf_skb_change_tail || 7763 func == sk_skb_change_tail || 7764 func == bpf_skb_adjust_room || 7765 func == sk_skb_adjust_room || 7766 func == bpf_skb_pull_data || 7767 func == sk_skb_pull_data || 7768 func == bpf_clone_redirect || 7769 func == bpf_l3_csum_replace || 7770 func == bpf_l4_csum_replace || 7771 func == bpf_xdp_adjust_head || 7772 func == bpf_xdp_adjust_meta || 7773 func == bpf_msg_pull_data || 7774 func == bpf_msg_push_data || 7775 func == bpf_msg_pop_data || 7776 func == bpf_xdp_adjust_tail || 7777 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 7778 func == bpf_lwt_seg6_store_bytes || 7779 func == bpf_lwt_seg6_adjust_srh || 7780 func == bpf_lwt_seg6_action || 7781 #endif 7782 #ifdef CONFIG_INET 7783 func == bpf_sock_ops_store_hdr_opt || 7784 #endif 7785 func == bpf_lwt_in_push_encap || 7786 func == bpf_lwt_xmit_push_encap) 7787 return true; 7788 7789 return false; 7790 } 7791 7792 const struct bpf_func_proto bpf_event_output_data_proto __weak; 7793 const struct bpf_func_proto bpf_sk_storage_get_cg_sock_proto __weak; 7794 7795 static const struct bpf_func_proto * 7796 sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7797 { 7798 const struct bpf_func_proto *func_proto; 7799 7800 func_proto = cgroup_common_func_proto(func_id, prog); 7801 if (func_proto) 7802 return func_proto; 7803 7804 func_proto = cgroup_current_func_proto(func_id, prog); 7805 if (func_proto) 7806 return func_proto; 7807 7808 switch (func_id) { 7809 case BPF_FUNC_get_socket_cookie: 7810 return &bpf_get_socket_cookie_sock_proto; 7811 case BPF_FUNC_get_netns_cookie: 7812 return &bpf_get_netns_cookie_sock_proto; 7813 case BPF_FUNC_perf_event_output: 7814 return &bpf_event_output_data_proto; 7815 case BPF_FUNC_sk_storage_get: 7816 return &bpf_sk_storage_get_cg_sock_proto; 7817 case BPF_FUNC_ktime_get_coarse_ns: 7818 return &bpf_ktime_get_coarse_ns_proto; 7819 default: 7820 return bpf_base_func_proto(func_id); 7821 } 7822 } 7823 7824 static const struct bpf_func_proto * 7825 sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7826 { 7827 const struct bpf_func_proto *func_proto; 7828 7829 func_proto = cgroup_common_func_proto(func_id, prog); 7830 if (func_proto) 7831 return func_proto; 7832 7833 func_proto = cgroup_current_func_proto(func_id, prog); 7834 if (func_proto) 7835 return func_proto; 7836 7837 switch (func_id) { 7838 case BPF_FUNC_bind: 7839 switch (prog->expected_attach_type) { 7840 case BPF_CGROUP_INET4_CONNECT: 7841 case BPF_CGROUP_INET6_CONNECT: 7842 return &bpf_bind_proto; 7843 default: 7844 return NULL; 7845 } 7846 case BPF_FUNC_get_socket_cookie: 7847 return &bpf_get_socket_cookie_sock_addr_proto; 7848 case BPF_FUNC_get_netns_cookie: 7849 return &bpf_get_netns_cookie_sock_addr_proto; 7850 case BPF_FUNC_perf_event_output: 7851 return &bpf_event_output_data_proto; 7852 #ifdef CONFIG_INET 7853 case BPF_FUNC_sk_lookup_tcp: 7854 return &bpf_sock_addr_sk_lookup_tcp_proto; 7855 case BPF_FUNC_sk_lookup_udp: 7856 return &bpf_sock_addr_sk_lookup_udp_proto; 7857 case BPF_FUNC_sk_release: 7858 return &bpf_sk_release_proto; 7859 case BPF_FUNC_skc_lookup_tcp: 7860 return &bpf_sock_addr_skc_lookup_tcp_proto; 7861 #endif /* CONFIG_INET */ 7862 case BPF_FUNC_sk_storage_get: 7863 return &bpf_sk_storage_get_proto; 7864 case BPF_FUNC_sk_storage_delete: 7865 return &bpf_sk_storage_delete_proto; 7866 case BPF_FUNC_setsockopt: 7867 switch (prog->expected_attach_type) { 7868 case BPF_CGROUP_INET4_BIND: 7869 case BPF_CGROUP_INET6_BIND: 7870 case BPF_CGROUP_INET4_CONNECT: 7871 case BPF_CGROUP_INET6_CONNECT: 7872 case BPF_CGROUP_UDP4_RECVMSG: 7873 case BPF_CGROUP_UDP6_RECVMSG: 7874 case BPF_CGROUP_UDP4_SENDMSG: 7875 case BPF_CGROUP_UDP6_SENDMSG: 7876 case BPF_CGROUP_INET4_GETPEERNAME: 7877 case BPF_CGROUP_INET6_GETPEERNAME: 7878 case BPF_CGROUP_INET4_GETSOCKNAME: 7879 case BPF_CGROUP_INET6_GETSOCKNAME: 7880 return &bpf_sock_addr_setsockopt_proto; 7881 default: 7882 return NULL; 7883 } 7884 case BPF_FUNC_getsockopt: 7885 switch (prog->expected_attach_type) { 7886 case BPF_CGROUP_INET4_BIND: 7887 case BPF_CGROUP_INET6_BIND: 7888 case BPF_CGROUP_INET4_CONNECT: 7889 case BPF_CGROUP_INET6_CONNECT: 7890 case BPF_CGROUP_UDP4_RECVMSG: 7891 case BPF_CGROUP_UDP6_RECVMSG: 7892 case BPF_CGROUP_UDP4_SENDMSG: 7893 case BPF_CGROUP_UDP6_SENDMSG: 7894 case BPF_CGROUP_INET4_GETPEERNAME: 7895 case BPF_CGROUP_INET6_GETPEERNAME: 7896 case BPF_CGROUP_INET4_GETSOCKNAME: 7897 case BPF_CGROUP_INET6_GETSOCKNAME: 7898 return &bpf_sock_addr_getsockopt_proto; 7899 default: 7900 return NULL; 7901 } 7902 default: 7903 return bpf_sk_base_func_proto(func_id); 7904 } 7905 } 7906 7907 static const struct bpf_func_proto * 7908 sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7909 { 7910 switch (func_id) { 7911 case BPF_FUNC_skb_load_bytes: 7912 return &bpf_skb_load_bytes_proto; 7913 case BPF_FUNC_skb_load_bytes_relative: 7914 return &bpf_skb_load_bytes_relative_proto; 7915 case BPF_FUNC_get_socket_cookie: 7916 return &bpf_get_socket_cookie_proto; 7917 case BPF_FUNC_get_socket_uid: 7918 return &bpf_get_socket_uid_proto; 7919 case BPF_FUNC_perf_event_output: 7920 return &bpf_skb_event_output_proto; 7921 default: 7922 return bpf_sk_base_func_proto(func_id); 7923 } 7924 } 7925 7926 const struct bpf_func_proto bpf_sk_storage_get_proto __weak; 7927 const struct bpf_func_proto bpf_sk_storage_delete_proto __weak; 7928 7929 static const struct bpf_func_proto * 7930 cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7931 { 7932 const struct bpf_func_proto *func_proto; 7933 7934 func_proto = cgroup_common_func_proto(func_id, prog); 7935 if (func_proto) 7936 return func_proto; 7937 7938 switch (func_id) { 7939 case BPF_FUNC_sk_fullsock: 7940 return &bpf_sk_fullsock_proto; 7941 case BPF_FUNC_sk_storage_get: 7942 return &bpf_sk_storage_get_proto; 7943 case BPF_FUNC_sk_storage_delete: 7944 return &bpf_sk_storage_delete_proto; 7945 case BPF_FUNC_perf_event_output: 7946 return &bpf_skb_event_output_proto; 7947 #ifdef CONFIG_SOCK_CGROUP_DATA 7948 case BPF_FUNC_skb_cgroup_id: 7949 return &bpf_skb_cgroup_id_proto; 7950 case BPF_FUNC_skb_ancestor_cgroup_id: 7951 return &bpf_skb_ancestor_cgroup_id_proto; 7952 case BPF_FUNC_sk_cgroup_id: 7953 return &bpf_sk_cgroup_id_proto; 7954 case BPF_FUNC_sk_ancestor_cgroup_id: 7955 return &bpf_sk_ancestor_cgroup_id_proto; 7956 #endif 7957 #ifdef CONFIG_INET 7958 case BPF_FUNC_sk_lookup_tcp: 7959 return &bpf_sk_lookup_tcp_proto; 7960 case BPF_FUNC_sk_lookup_udp: 7961 return &bpf_sk_lookup_udp_proto; 7962 case BPF_FUNC_sk_release: 7963 return &bpf_sk_release_proto; 7964 case BPF_FUNC_skc_lookup_tcp: 7965 return &bpf_skc_lookup_tcp_proto; 7966 case BPF_FUNC_tcp_sock: 7967 return &bpf_tcp_sock_proto; 7968 case BPF_FUNC_get_listener_sock: 7969 return &bpf_get_listener_sock_proto; 7970 case BPF_FUNC_skb_ecn_set_ce: 7971 return &bpf_skb_ecn_set_ce_proto; 7972 #endif 7973 default: 7974 return sk_filter_func_proto(func_id, prog); 7975 } 7976 } 7977 7978 static const struct bpf_func_proto * 7979 tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7980 { 7981 switch (func_id) { 7982 case BPF_FUNC_skb_store_bytes: 7983 return &bpf_skb_store_bytes_proto; 7984 case BPF_FUNC_skb_load_bytes: 7985 return &bpf_skb_load_bytes_proto; 7986 case BPF_FUNC_skb_load_bytes_relative: 7987 return &bpf_skb_load_bytes_relative_proto; 7988 case BPF_FUNC_skb_pull_data: 7989 return &bpf_skb_pull_data_proto; 7990 case BPF_FUNC_csum_diff: 7991 return &bpf_csum_diff_proto; 7992 case BPF_FUNC_csum_update: 7993 return &bpf_csum_update_proto; 7994 case BPF_FUNC_csum_level: 7995 return &bpf_csum_level_proto; 7996 case BPF_FUNC_l3_csum_replace: 7997 return &bpf_l3_csum_replace_proto; 7998 case BPF_FUNC_l4_csum_replace: 7999 return &bpf_l4_csum_replace_proto; 8000 case BPF_FUNC_clone_redirect: 8001 return &bpf_clone_redirect_proto; 8002 case BPF_FUNC_get_cgroup_classid: 8003 return &bpf_get_cgroup_classid_proto; 8004 case BPF_FUNC_skb_vlan_push: 8005 return &bpf_skb_vlan_push_proto; 8006 case BPF_FUNC_skb_vlan_pop: 8007 return &bpf_skb_vlan_pop_proto; 8008 case BPF_FUNC_skb_change_proto: 8009 return &bpf_skb_change_proto_proto; 8010 case BPF_FUNC_skb_change_type: 8011 return &bpf_skb_change_type_proto; 8012 case BPF_FUNC_skb_adjust_room: 8013 return &bpf_skb_adjust_room_proto; 8014 case BPF_FUNC_skb_change_tail: 8015 return &bpf_skb_change_tail_proto; 8016 case BPF_FUNC_skb_change_head: 8017 return &bpf_skb_change_head_proto; 8018 case BPF_FUNC_skb_get_tunnel_key: 8019 return &bpf_skb_get_tunnel_key_proto; 8020 case BPF_FUNC_skb_set_tunnel_key: 8021 return bpf_get_skb_set_tunnel_proto(func_id); 8022 case BPF_FUNC_skb_get_tunnel_opt: 8023 return &bpf_skb_get_tunnel_opt_proto; 8024 case BPF_FUNC_skb_set_tunnel_opt: 8025 return bpf_get_skb_set_tunnel_proto(func_id); 8026 case BPF_FUNC_redirect: 8027 return &bpf_redirect_proto; 8028 case BPF_FUNC_redirect_neigh: 8029 return &bpf_redirect_neigh_proto; 8030 case BPF_FUNC_redirect_peer: 8031 return &bpf_redirect_peer_proto; 8032 case BPF_FUNC_get_route_realm: 8033 return &bpf_get_route_realm_proto; 8034 case BPF_FUNC_get_hash_recalc: 8035 return &bpf_get_hash_recalc_proto; 8036 case BPF_FUNC_set_hash_invalid: 8037 return &bpf_set_hash_invalid_proto; 8038 case BPF_FUNC_set_hash: 8039 return &bpf_set_hash_proto; 8040 case BPF_FUNC_perf_event_output: 8041 return &bpf_skb_event_output_proto; 8042 case BPF_FUNC_get_smp_processor_id: 8043 return &bpf_get_smp_processor_id_proto; 8044 case BPF_FUNC_skb_under_cgroup: 8045 return &bpf_skb_under_cgroup_proto; 8046 case BPF_FUNC_get_socket_cookie: 8047 return &bpf_get_socket_cookie_proto; 8048 case BPF_FUNC_get_socket_uid: 8049 return &bpf_get_socket_uid_proto; 8050 case BPF_FUNC_fib_lookup: 8051 return &bpf_skb_fib_lookup_proto; 8052 case BPF_FUNC_check_mtu: 8053 return &bpf_skb_check_mtu_proto; 8054 case BPF_FUNC_sk_fullsock: 8055 return &bpf_sk_fullsock_proto; 8056 case BPF_FUNC_sk_storage_get: 8057 return &bpf_sk_storage_get_proto; 8058 case BPF_FUNC_sk_storage_delete: 8059 return &bpf_sk_storage_delete_proto; 8060 #ifdef CONFIG_XFRM 8061 case BPF_FUNC_skb_get_xfrm_state: 8062 return &bpf_skb_get_xfrm_state_proto; 8063 #endif 8064 #ifdef CONFIG_CGROUP_NET_CLASSID 8065 case BPF_FUNC_skb_cgroup_classid: 8066 return &bpf_skb_cgroup_classid_proto; 8067 #endif 8068 #ifdef CONFIG_SOCK_CGROUP_DATA 8069 case BPF_FUNC_skb_cgroup_id: 8070 return &bpf_skb_cgroup_id_proto; 8071 case BPF_FUNC_skb_ancestor_cgroup_id: 8072 return &bpf_skb_ancestor_cgroup_id_proto; 8073 #endif 8074 #ifdef CONFIG_INET 8075 case BPF_FUNC_sk_lookup_tcp: 8076 return &bpf_tc_sk_lookup_tcp_proto; 8077 case BPF_FUNC_sk_lookup_udp: 8078 return &bpf_tc_sk_lookup_udp_proto; 8079 case BPF_FUNC_sk_release: 8080 return &bpf_sk_release_proto; 8081 case BPF_FUNC_tcp_sock: 8082 return &bpf_tcp_sock_proto; 8083 case BPF_FUNC_get_listener_sock: 8084 return &bpf_get_listener_sock_proto; 8085 case BPF_FUNC_skc_lookup_tcp: 8086 return &bpf_tc_skc_lookup_tcp_proto; 8087 case BPF_FUNC_tcp_check_syncookie: 8088 return &bpf_tcp_check_syncookie_proto; 8089 case BPF_FUNC_skb_ecn_set_ce: 8090 return &bpf_skb_ecn_set_ce_proto; 8091 case BPF_FUNC_tcp_gen_syncookie: 8092 return &bpf_tcp_gen_syncookie_proto; 8093 case BPF_FUNC_sk_assign: 8094 return &bpf_sk_assign_proto; 8095 case BPF_FUNC_skb_set_tstamp: 8096 return &bpf_skb_set_tstamp_proto; 8097 #ifdef CONFIG_SYN_COOKIES 8098 case BPF_FUNC_tcp_raw_gen_syncookie_ipv4: 8099 return &bpf_tcp_raw_gen_syncookie_ipv4_proto; 8100 case BPF_FUNC_tcp_raw_gen_syncookie_ipv6: 8101 return &bpf_tcp_raw_gen_syncookie_ipv6_proto; 8102 case BPF_FUNC_tcp_raw_check_syncookie_ipv4: 8103 return &bpf_tcp_raw_check_syncookie_ipv4_proto; 8104 case BPF_FUNC_tcp_raw_check_syncookie_ipv6: 8105 return &bpf_tcp_raw_check_syncookie_ipv6_proto; 8106 #endif 8107 #endif 8108 default: 8109 return bpf_sk_base_func_proto(func_id); 8110 } 8111 } 8112 8113 static const struct bpf_func_proto * 8114 xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8115 { 8116 switch (func_id) { 8117 case BPF_FUNC_perf_event_output: 8118 return &bpf_xdp_event_output_proto; 8119 case BPF_FUNC_get_smp_processor_id: 8120 return &bpf_get_smp_processor_id_proto; 8121 case BPF_FUNC_csum_diff: 8122 return &bpf_csum_diff_proto; 8123 case BPF_FUNC_xdp_adjust_head: 8124 return &bpf_xdp_adjust_head_proto; 8125 case BPF_FUNC_xdp_adjust_meta: 8126 return &bpf_xdp_adjust_meta_proto; 8127 case BPF_FUNC_redirect: 8128 return &bpf_xdp_redirect_proto; 8129 case BPF_FUNC_redirect_map: 8130 return &bpf_xdp_redirect_map_proto; 8131 case BPF_FUNC_xdp_adjust_tail: 8132 return &bpf_xdp_adjust_tail_proto; 8133 case BPF_FUNC_xdp_get_buff_len: 8134 return &bpf_xdp_get_buff_len_proto; 8135 case BPF_FUNC_xdp_load_bytes: 8136 return &bpf_xdp_load_bytes_proto; 8137 case BPF_FUNC_xdp_store_bytes: 8138 return &bpf_xdp_store_bytes_proto; 8139 case BPF_FUNC_fib_lookup: 8140 return &bpf_xdp_fib_lookup_proto; 8141 case BPF_FUNC_check_mtu: 8142 return &bpf_xdp_check_mtu_proto; 8143 #ifdef CONFIG_INET 8144 case BPF_FUNC_sk_lookup_udp: 8145 return &bpf_xdp_sk_lookup_udp_proto; 8146 case BPF_FUNC_sk_lookup_tcp: 8147 return &bpf_xdp_sk_lookup_tcp_proto; 8148 case BPF_FUNC_sk_release: 8149 return &bpf_sk_release_proto; 8150 case BPF_FUNC_skc_lookup_tcp: 8151 return &bpf_xdp_skc_lookup_tcp_proto; 8152 case BPF_FUNC_tcp_check_syncookie: 8153 return &bpf_tcp_check_syncookie_proto; 8154 case BPF_FUNC_tcp_gen_syncookie: 8155 return &bpf_tcp_gen_syncookie_proto; 8156 #ifdef CONFIG_SYN_COOKIES 8157 case BPF_FUNC_tcp_raw_gen_syncookie_ipv4: 8158 return &bpf_tcp_raw_gen_syncookie_ipv4_proto; 8159 case BPF_FUNC_tcp_raw_gen_syncookie_ipv6: 8160 return &bpf_tcp_raw_gen_syncookie_ipv6_proto; 8161 case BPF_FUNC_tcp_raw_check_syncookie_ipv4: 8162 return &bpf_tcp_raw_check_syncookie_ipv4_proto; 8163 case BPF_FUNC_tcp_raw_check_syncookie_ipv6: 8164 return &bpf_tcp_raw_check_syncookie_ipv6_proto; 8165 #endif 8166 #endif 8167 default: 8168 return bpf_sk_base_func_proto(func_id); 8169 } 8170 8171 #if IS_MODULE(CONFIG_NF_CONNTRACK) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES) 8172 /* The nf_conn___init type is used in the NF_CONNTRACK kfuncs. The 8173 * kfuncs are defined in two different modules, and we want to be able 8174 * to use them interchangably with the same BTF type ID. Because modules 8175 * can't de-duplicate BTF IDs between each other, we need the type to be 8176 * referenced in the vmlinux BTF or the verifier will get confused about 8177 * the different types. So we add this dummy type reference which will 8178 * be included in vmlinux BTF, allowing both modules to refer to the 8179 * same type ID. 8180 */ 8181 BTF_TYPE_EMIT(struct nf_conn___init); 8182 #endif 8183 } 8184 8185 const struct bpf_func_proto bpf_sock_map_update_proto __weak; 8186 const struct bpf_func_proto bpf_sock_hash_update_proto __weak; 8187 8188 static const struct bpf_func_proto * 8189 sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8190 { 8191 const struct bpf_func_proto *func_proto; 8192 8193 func_proto = cgroup_common_func_proto(func_id, prog); 8194 if (func_proto) 8195 return func_proto; 8196 8197 switch (func_id) { 8198 case BPF_FUNC_setsockopt: 8199 return &bpf_sock_ops_setsockopt_proto; 8200 case BPF_FUNC_getsockopt: 8201 return &bpf_sock_ops_getsockopt_proto; 8202 case BPF_FUNC_sock_ops_cb_flags_set: 8203 return &bpf_sock_ops_cb_flags_set_proto; 8204 case BPF_FUNC_sock_map_update: 8205 return &bpf_sock_map_update_proto; 8206 case BPF_FUNC_sock_hash_update: 8207 return &bpf_sock_hash_update_proto; 8208 case BPF_FUNC_get_socket_cookie: 8209 return &bpf_get_socket_cookie_sock_ops_proto; 8210 case BPF_FUNC_perf_event_output: 8211 return &bpf_event_output_data_proto; 8212 case BPF_FUNC_sk_storage_get: 8213 return &bpf_sk_storage_get_proto; 8214 case BPF_FUNC_sk_storage_delete: 8215 return &bpf_sk_storage_delete_proto; 8216 case BPF_FUNC_get_netns_cookie: 8217 return &bpf_get_netns_cookie_sock_ops_proto; 8218 #ifdef CONFIG_INET 8219 case BPF_FUNC_load_hdr_opt: 8220 return &bpf_sock_ops_load_hdr_opt_proto; 8221 case BPF_FUNC_store_hdr_opt: 8222 return &bpf_sock_ops_store_hdr_opt_proto; 8223 case BPF_FUNC_reserve_hdr_opt: 8224 return &bpf_sock_ops_reserve_hdr_opt_proto; 8225 case BPF_FUNC_tcp_sock: 8226 return &bpf_tcp_sock_proto; 8227 #endif /* CONFIG_INET */ 8228 default: 8229 return bpf_sk_base_func_proto(func_id); 8230 } 8231 } 8232 8233 const struct bpf_func_proto bpf_msg_redirect_map_proto __weak; 8234 const struct bpf_func_proto bpf_msg_redirect_hash_proto __weak; 8235 8236 static const struct bpf_func_proto * 8237 sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8238 { 8239 switch (func_id) { 8240 case BPF_FUNC_msg_redirect_map: 8241 return &bpf_msg_redirect_map_proto; 8242 case BPF_FUNC_msg_redirect_hash: 8243 return &bpf_msg_redirect_hash_proto; 8244 case BPF_FUNC_msg_apply_bytes: 8245 return &bpf_msg_apply_bytes_proto; 8246 case BPF_FUNC_msg_cork_bytes: 8247 return &bpf_msg_cork_bytes_proto; 8248 case BPF_FUNC_msg_pull_data: 8249 return &bpf_msg_pull_data_proto; 8250 case BPF_FUNC_msg_push_data: 8251 return &bpf_msg_push_data_proto; 8252 case BPF_FUNC_msg_pop_data: 8253 return &bpf_msg_pop_data_proto; 8254 case BPF_FUNC_perf_event_output: 8255 return &bpf_event_output_data_proto; 8256 case BPF_FUNC_get_current_uid_gid: 8257 return &bpf_get_current_uid_gid_proto; 8258 case BPF_FUNC_get_current_pid_tgid: 8259 return &bpf_get_current_pid_tgid_proto; 8260 case BPF_FUNC_sk_storage_get: 8261 return &bpf_sk_storage_get_proto; 8262 case BPF_FUNC_sk_storage_delete: 8263 return &bpf_sk_storage_delete_proto; 8264 case BPF_FUNC_get_netns_cookie: 8265 return &bpf_get_netns_cookie_sk_msg_proto; 8266 #ifdef CONFIG_CGROUP_NET_CLASSID 8267 case BPF_FUNC_get_cgroup_classid: 8268 return &bpf_get_cgroup_classid_curr_proto; 8269 #endif 8270 default: 8271 return bpf_sk_base_func_proto(func_id); 8272 } 8273 } 8274 8275 const struct bpf_func_proto bpf_sk_redirect_map_proto __weak; 8276 const struct bpf_func_proto bpf_sk_redirect_hash_proto __weak; 8277 8278 static const struct bpf_func_proto * 8279 sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8280 { 8281 switch (func_id) { 8282 case BPF_FUNC_skb_store_bytes: 8283 return &bpf_skb_store_bytes_proto; 8284 case BPF_FUNC_skb_load_bytes: 8285 return &bpf_skb_load_bytes_proto; 8286 case BPF_FUNC_skb_pull_data: 8287 return &sk_skb_pull_data_proto; 8288 case BPF_FUNC_skb_change_tail: 8289 return &sk_skb_change_tail_proto; 8290 case BPF_FUNC_skb_change_head: 8291 return &sk_skb_change_head_proto; 8292 case BPF_FUNC_skb_adjust_room: 8293 return &sk_skb_adjust_room_proto; 8294 case BPF_FUNC_get_socket_cookie: 8295 return &bpf_get_socket_cookie_proto; 8296 case BPF_FUNC_get_socket_uid: 8297 return &bpf_get_socket_uid_proto; 8298 case BPF_FUNC_sk_redirect_map: 8299 return &bpf_sk_redirect_map_proto; 8300 case BPF_FUNC_sk_redirect_hash: 8301 return &bpf_sk_redirect_hash_proto; 8302 case BPF_FUNC_perf_event_output: 8303 return &bpf_skb_event_output_proto; 8304 #ifdef CONFIG_INET 8305 case BPF_FUNC_sk_lookup_tcp: 8306 return &bpf_sk_lookup_tcp_proto; 8307 case BPF_FUNC_sk_lookup_udp: 8308 return &bpf_sk_lookup_udp_proto; 8309 case BPF_FUNC_sk_release: 8310 return &bpf_sk_release_proto; 8311 case BPF_FUNC_skc_lookup_tcp: 8312 return &bpf_skc_lookup_tcp_proto; 8313 #endif 8314 default: 8315 return bpf_sk_base_func_proto(func_id); 8316 } 8317 } 8318 8319 static const struct bpf_func_proto * 8320 flow_dissector_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8321 { 8322 switch (func_id) { 8323 case BPF_FUNC_skb_load_bytes: 8324 return &bpf_flow_dissector_load_bytes_proto; 8325 default: 8326 return bpf_sk_base_func_proto(func_id); 8327 } 8328 } 8329 8330 static const struct bpf_func_proto * 8331 lwt_out_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8332 { 8333 switch (func_id) { 8334 case BPF_FUNC_skb_load_bytes: 8335 return &bpf_skb_load_bytes_proto; 8336 case BPF_FUNC_skb_pull_data: 8337 return &bpf_skb_pull_data_proto; 8338 case BPF_FUNC_csum_diff: 8339 return &bpf_csum_diff_proto; 8340 case BPF_FUNC_get_cgroup_classid: 8341 return &bpf_get_cgroup_classid_proto; 8342 case BPF_FUNC_get_route_realm: 8343 return &bpf_get_route_realm_proto; 8344 case BPF_FUNC_get_hash_recalc: 8345 return &bpf_get_hash_recalc_proto; 8346 case BPF_FUNC_perf_event_output: 8347 return &bpf_skb_event_output_proto; 8348 case BPF_FUNC_get_smp_processor_id: 8349 return &bpf_get_smp_processor_id_proto; 8350 case BPF_FUNC_skb_under_cgroup: 8351 return &bpf_skb_under_cgroup_proto; 8352 default: 8353 return bpf_sk_base_func_proto(func_id); 8354 } 8355 } 8356 8357 static const struct bpf_func_proto * 8358 lwt_in_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8359 { 8360 switch (func_id) { 8361 case BPF_FUNC_lwt_push_encap: 8362 return &bpf_lwt_in_push_encap_proto; 8363 default: 8364 return lwt_out_func_proto(func_id, prog); 8365 } 8366 } 8367 8368 static const struct bpf_func_proto * 8369 lwt_xmit_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8370 { 8371 switch (func_id) { 8372 case BPF_FUNC_skb_get_tunnel_key: 8373 return &bpf_skb_get_tunnel_key_proto; 8374 case BPF_FUNC_skb_set_tunnel_key: 8375 return bpf_get_skb_set_tunnel_proto(func_id); 8376 case BPF_FUNC_skb_get_tunnel_opt: 8377 return &bpf_skb_get_tunnel_opt_proto; 8378 case BPF_FUNC_skb_set_tunnel_opt: 8379 return bpf_get_skb_set_tunnel_proto(func_id); 8380 case BPF_FUNC_redirect: 8381 return &bpf_redirect_proto; 8382 case BPF_FUNC_clone_redirect: 8383 return &bpf_clone_redirect_proto; 8384 case BPF_FUNC_skb_change_tail: 8385 return &bpf_skb_change_tail_proto; 8386 case BPF_FUNC_skb_change_head: 8387 return &bpf_skb_change_head_proto; 8388 case BPF_FUNC_skb_store_bytes: 8389 return &bpf_skb_store_bytes_proto; 8390 case BPF_FUNC_csum_update: 8391 return &bpf_csum_update_proto; 8392 case BPF_FUNC_csum_level: 8393 return &bpf_csum_level_proto; 8394 case BPF_FUNC_l3_csum_replace: 8395 return &bpf_l3_csum_replace_proto; 8396 case BPF_FUNC_l4_csum_replace: 8397 return &bpf_l4_csum_replace_proto; 8398 case BPF_FUNC_set_hash_invalid: 8399 return &bpf_set_hash_invalid_proto; 8400 case BPF_FUNC_lwt_push_encap: 8401 return &bpf_lwt_xmit_push_encap_proto; 8402 default: 8403 return lwt_out_func_proto(func_id, prog); 8404 } 8405 } 8406 8407 static const struct bpf_func_proto * 8408 lwt_seg6local_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8409 { 8410 switch (func_id) { 8411 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 8412 case BPF_FUNC_lwt_seg6_store_bytes: 8413 return &bpf_lwt_seg6_store_bytes_proto; 8414 case BPF_FUNC_lwt_seg6_action: 8415 return &bpf_lwt_seg6_action_proto; 8416 case BPF_FUNC_lwt_seg6_adjust_srh: 8417 return &bpf_lwt_seg6_adjust_srh_proto; 8418 #endif 8419 default: 8420 return lwt_out_func_proto(func_id, prog); 8421 } 8422 } 8423 8424 static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type, 8425 const struct bpf_prog *prog, 8426 struct bpf_insn_access_aux *info) 8427 { 8428 const int size_default = sizeof(__u32); 8429 8430 if (off < 0 || off >= sizeof(struct __sk_buff)) 8431 return false; 8432 8433 /* The verifier guarantees that size > 0. */ 8434 if (off % size != 0) 8435 return false; 8436 8437 switch (off) { 8438 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8439 if (off + size > offsetofend(struct __sk_buff, cb[4])) 8440 return false; 8441 break; 8442 case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]): 8443 case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]): 8444 case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4): 8445 case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4): 8446 case bpf_ctx_range(struct __sk_buff, data): 8447 case bpf_ctx_range(struct __sk_buff, data_meta): 8448 case bpf_ctx_range(struct __sk_buff, data_end): 8449 if (size != size_default) 8450 return false; 8451 break; 8452 case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): 8453 return false; 8454 case bpf_ctx_range(struct __sk_buff, hwtstamp): 8455 if (type == BPF_WRITE || size != sizeof(__u64)) 8456 return false; 8457 break; 8458 case bpf_ctx_range(struct __sk_buff, tstamp): 8459 if (size != sizeof(__u64)) 8460 return false; 8461 break; 8462 case offsetof(struct __sk_buff, sk): 8463 if (type == BPF_WRITE || size != sizeof(__u64)) 8464 return false; 8465 info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL; 8466 break; 8467 case offsetof(struct __sk_buff, tstamp_type): 8468 return false; 8469 case offsetofend(struct __sk_buff, tstamp_type) ... offsetof(struct __sk_buff, hwtstamp) - 1: 8470 /* Explicitly prohibit access to padding in __sk_buff. */ 8471 return false; 8472 default: 8473 /* Only narrow read access allowed for now. */ 8474 if (type == BPF_WRITE) { 8475 if (size != size_default) 8476 return false; 8477 } else { 8478 bpf_ctx_record_field_size(info, size_default); 8479 if (!bpf_ctx_narrow_access_ok(off, size, size_default)) 8480 return false; 8481 } 8482 } 8483 8484 return true; 8485 } 8486 8487 static bool sk_filter_is_valid_access(int off, int size, 8488 enum bpf_access_type type, 8489 const struct bpf_prog *prog, 8490 struct bpf_insn_access_aux *info) 8491 { 8492 switch (off) { 8493 case bpf_ctx_range(struct __sk_buff, tc_classid): 8494 case bpf_ctx_range(struct __sk_buff, data): 8495 case bpf_ctx_range(struct __sk_buff, data_meta): 8496 case bpf_ctx_range(struct __sk_buff, data_end): 8497 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 8498 case bpf_ctx_range(struct __sk_buff, tstamp): 8499 case bpf_ctx_range(struct __sk_buff, wire_len): 8500 case bpf_ctx_range(struct __sk_buff, hwtstamp): 8501 return false; 8502 } 8503 8504 if (type == BPF_WRITE) { 8505 switch (off) { 8506 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8507 break; 8508 default: 8509 return false; 8510 } 8511 } 8512 8513 return bpf_skb_is_valid_access(off, size, type, prog, info); 8514 } 8515 8516 static bool cg_skb_is_valid_access(int off, int size, 8517 enum bpf_access_type type, 8518 const struct bpf_prog *prog, 8519 struct bpf_insn_access_aux *info) 8520 { 8521 switch (off) { 8522 case bpf_ctx_range(struct __sk_buff, tc_classid): 8523 case bpf_ctx_range(struct __sk_buff, data_meta): 8524 case bpf_ctx_range(struct __sk_buff, wire_len): 8525 return false; 8526 case bpf_ctx_range(struct __sk_buff, data): 8527 case bpf_ctx_range(struct __sk_buff, data_end): 8528 if (!bpf_capable()) 8529 return false; 8530 break; 8531 } 8532 8533 if (type == BPF_WRITE) { 8534 switch (off) { 8535 case bpf_ctx_range(struct __sk_buff, mark): 8536 case bpf_ctx_range(struct __sk_buff, priority): 8537 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8538 break; 8539 case bpf_ctx_range(struct __sk_buff, tstamp): 8540 if (!bpf_capable()) 8541 return false; 8542 break; 8543 default: 8544 return false; 8545 } 8546 } 8547 8548 switch (off) { 8549 case bpf_ctx_range(struct __sk_buff, data): 8550 info->reg_type = PTR_TO_PACKET; 8551 break; 8552 case bpf_ctx_range(struct __sk_buff, data_end): 8553 info->reg_type = PTR_TO_PACKET_END; 8554 break; 8555 } 8556 8557 return bpf_skb_is_valid_access(off, size, type, prog, info); 8558 } 8559 8560 static bool lwt_is_valid_access(int off, int size, 8561 enum bpf_access_type type, 8562 const struct bpf_prog *prog, 8563 struct bpf_insn_access_aux *info) 8564 { 8565 switch (off) { 8566 case bpf_ctx_range(struct __sk_buff, tc_classid): 8567 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 8568 case bpf_ctx_range(struct __sk_buff, data_meta): 8569 case bpf_ctx_range(struct __sk_buff, tstamp): 8570 case bpf_ctx_range(struct __sk_buff, wire_len): 8571 case bpf_ctx_range(struct __sk_buff, hwtstamp): 8572 return false; 8573 } 8574 8575 if (type == BPF_WRITE) { 8576 switch (off) { 8577 case bpf_ctx_range(struct __sk_buff, mark): 8578 case bpf_ctx_range(struct __sk_buff, priority): 8579 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8580 break; 8581 default: 8582 return false; 8583 } 8584 } 8585 8586 switch (off) { 8587 case bpf_ctx_range(struct __sk_buff, data): 8588 info->reg_type = PTR_TO_PACKET; 8589 break; 8590 case bpf_ctx_range(struct __sk_buff, data_end): 8591 info->reg_type = PTR_TO_PACKET_END; 8592 break; 8593 } 8594 8595 return bpf_skb_is_valid_access(off, size, type, prog, info); 8596 } 8597 8598 /* Attach type specific accesses */ 8599 static bool __sock_filter_check_attach_type(int off, 8600 enum bpf_access_type access_type, 8601 enum bpf_attach_type attach_type) 8602 { 8603 switch (off) { 8604 case offsetof(struct bpf_sock, bound_dev_if): 8605 case offsetof(struct bpf_sock, mark): 8606 case offsetof(struct bpf_sock, priority): 8607 switch (attach_type) { 8608 case BPF_CGROUP_INET_SOCK_CREATE: 8609 case BPF_CGROUP_INET_SOCK_RELEASE: 8610 goto full_access; 8611 default: 8612 return false; 8613 } 8614 case bpf_ctx_range(struct bpf_sock, src_ip4): 8615 switch (attach_type) { 8616 case BPF_CGROUP_INET4_POST_BIND: 8617 goto read_only; 8618 default: 8619 return false; 8620 } 8621 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 8622 switch (attach_type) { 8623 case BPF_CGROUP_INET6_POST_BIND: 8624 goto read_only; 8625 default: 8626 return false; 8627 } 8628 case bpf_ctx_range(struct bpf_sock, src_port): 8629 switch (attach_type) { 8630 case BPF_CGROUP_INET4_POST_BIND: 8631 case BPF_CGROUP_INET6_POST_BIND: 8632 goto read_only; 8633 default: 8634 return false; 8635 } 8636 } 8637 read_only: 8638 return access_type == BPF_READ; 8639 full_access: 8640 return true; 8641 } 8642 8643 bool bpf_sock_common_is_valid_access(int off, int size, 8644 enum bpf_access_type type, 8645 struct bpf_insn_access_aux *info) 8646 { 8647 switch (off) { 8648 case bpf_ctx_range_till(struct bpf_sock, type, priority): 8649 return false; 8650 default: 8651 return bpf_sock_is_valid_access(off, size, type, info); 8652 } 8653 } 8654 8655 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, 8656 struct bpf_insn_access_aux *info) 8657 { 8658 const int size_default = sizeof(__u32); 8659 int field_size; 8660 8661 if (off < 0 || off >= sizeof(struct bpf_sock)) 8662 return false; 8663 if (off % size != 0) 8664 return false; 8665 8666 switch (off) { 8667 case offsetof(struct bpf_sock, state): 8668 case offsetof(struct bpf_sock, family): 8669 case offsetof(struct bpf_sock, type): 8670 case offsetof(struct bpf_sock, protocol): 8671 case offsetof(struct bpf_sock, src_port): 8672 case offsetof(struct bpf_sock, rx_queue_mapping): 8673 case bpf_ctx_range(struct bpf_sock, src_ip4): 8674 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 8675 case bpf_ctx_range(struct bpf_sock, dst_ip4): 8676 case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): 8677 bpf_ctx_record_field_size(info, size_default); 8678 return bpf_ctx_narrow_access_ok(off, size, size_default); 8679 case bpf_ctx_range(struct bpf_sock, dst_port): 8680 field_size = size == size_default ? 8681 size_default : sizeof_field(struct bpf_sock, dst_port); 8682 bpf_ctx_record_field_size(info, field_size); 8683 return bpf_ctx_narrow_access_ok(off, size, field_size); 8684 case offsetofend(struct bpf_sock, dst_port) ... 8685 offsetof(struct bpf_sock, dst_ip4) - 1: 8686 return false; 8687 } 8688 8689 return size == size_default; 8690 } 8691 8692 static bool sock_filter_is_valid_access(int off, int size, 8693 enum bpf_access_type type, 8694 const struct bpf_prog *prog, 8695 struct bpf_insn_access_aux *info) 8696 { 8697 if (!bpf_sock_is_valid_access(off, size, type, info)) 8698 return false; 8699 return __sock_filter_check_attach_type(off, type, 8700 prog->expected_attach_type); 8701 } 8702 8703 static int bpf_noop_prologue(struct bpf_insn *insn_buf, bool direct_write, 8704 const struct bpf_prog *prog) 8705 { 8706 /* Neither direct read nor direct write requires any preliminary 8707 * action. 8708 */ 8709 return 0; 8710 } 8711 8712 static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write, 8713 const struct bpf_prog *prog, int drop_verdict) 8714 { 8715 struct bpf_insn *insn = insn_buf; 8716 8717 if (!direct_write) 8718 return 0; 8719 8720 /* if (!skb->cloned) 8721 * goto start; 8722 * 8723 * (Fast-path, otherwise approximation that we might be 8724 * a clone, do the rest in helper.) 8725 */ 8726 *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET); 8727 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK); 8728 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7); 8729 8730 /* ret = bpf_skb_pull_data(skb, 0); */ 8731 *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1); 8732 *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2); 8733 *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, 8734 BPF_FUNC_skb_pull_data); 8735 /* if (!ret) 8736 * goto restore; 8737 * return TC_ACT_SHOT; 8738 */ 8739 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2); 8740 *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict); 8741 *insn++ = BPF_EXIT_INSN(); 8742 8743 /* restore: */ 8744 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6); 8745 /* start: */ 8746 *insn++ = prog->insnsi[0]; 8747 8748 return insn - insn_buf; 8749 } 8750 8751 static int bpf_gen_ld_abs(const struct bpf_insn *orig, 8752 struct bpf_insn *insn_buf) 8753 { 8754 bool indirect = BPF_MODE(orig->code) == BPF_IND; 8755 struct bpf_insn *insn = insn_buf; 8756 8757 if (!indirect) { 8758 *insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm); 8759 } else { 8760 *insn++ = BPF_MOV64_REG(BPF_REG_2, orig->src_reg); 8761 if (orig->imm) 8762 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm); 8763 } 8764 /* We're guaranteed here that CTX is in R6. */ 8765 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX); 8766 8767 switch (BPF_SIZE(orig->code)) { 8768 case BPF_B: 8769 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache); 8770 break; 8771 case BPF_H: 8772 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache); 8773 break; 8774 case BPF_W: 8775 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache); 8776 break; 8777 } 8778 8779 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 2); 8780 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0); 8781 *insn++ = BPF_EXIT_INSN(); 8782 8783 return insn - insn_buf; 8784 } 8785 8786 static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write, 8787 const struct bpf_prog *prog) 8788 { 8789 return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT); 8790 } 8791 8792 static bool tc_cls_act_is_valid_access(int off, int size, 8793 enum bpf_access_type type, 8794 const struct bpf_prog *prog, 8795 struct bpf_insn_access_aux *info) 8796 { 8797 if (type == BPF_WRITE) { 8798 switch (off) { 8799 case bpf_ctx_range(struct __sk_buff, mark): 8800 case bpf_ctx_range(struct __sk_buff, tc_index): 8801 case bpf_ctx_range(struct __sk_buff, priority): 8802 case bpf_ctx_range(struct __sk_buff, tc_classid): 8803 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8804 case bpf_ctx_range(struct __sk_buff, tstamp): 8805 case bpf_ctx_range(struct __sk_buff, queue_mapping): 8806 break; 8807 default: 8808 return false; 8809 } 8810 } 8811 8812 switch (off) { 8813 case bpf_ctx_range(struct __sk_buff, data): 8814 info->reg_type = PTR_TO_PACKET; 8815 break; 8816 case bpf_ctx_range(struct __sk_buff, data_meta): 8817 info->reg_type = PTR_TO_PACKET_META; 8818 break; 8819 case bpf_ctx_range(struct __sk_buff, data_end): 8820 info->reg_type = PTR_TO_PACKET_END; 8821 break; 8822 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 8823 return false; 8824 case offsetof(struct __sk_buff, tstamp_type): 8825 /* The convert_ctx_access() on reading and writing 8826 * __sk_buff->tstamp depends on whether the bpf prog 8827 * has used __sk_buff->tstamp_type or not. 8828 * Thus, we need to set prog->tstamp_type_access 8829 * earlier during is_valid_access() here. 8830 */ 8831 ((struct bpf_prog *)prog)->tstamp_type_access = 1; 8832 return size == sizeof(__u8); 8833 } 8834 8835 return bpf_skb_is_valid_access(off, size, type, prog, info); 8836 } 8837 8838 DEFINE_MUTEX(nf_conn_btf_access_lock); 8839 EXPORT_SYMBOL_GPL(nf_conn_btf_access_lock); 8840 8841 int (*nfct_btf_struct_access)(struct bpf_verifier_log *log, 8842 const struct bpf_reg_state *reg, 8843 int off, int size); 8844 EXPORT_SYMBOL_GPL(nfct_btf_struct_access); 8845 8846 static int tc_cls_act_btf_struct_access(struct bpf_verifier_log *log, 8847 const struct bpf_reg_state *reg, 8848 int off, int size) 8849 { 8850 int ret = -EACCES; 8851 8852 mutex_lock(&nf_conn_btf_access_lock); 8853 if (nfct_btf_struct_access) 8854 ret = nfct_btf_struct_access(log, reg, off, size); 8855 mutex_unlock(&nf_conn_btf_access_lock); 8856 8857 return ret; 8858 } 8859 8860 static bool __is_valid_xdp_access(int off, int size) 8861 { 8862 if (off < 0 || off >= sizeof(struct xdp_md)) 8863 return false; 8864 if (off % size != 0) 8865 return false; 8866 if (size != sizeof(__u32)) 8867 return false; 8868 8869 return true; 8870 } 8871 8872 static bool xdp_is_valid_access(int off, int size, 8873 enum bpf_access_type type, 8874 const struct bpf_prog *prog, 8875 struct bpf_insn_access_aux *info) 8876 { 8877 if (prog->expected_attach_type != BPF_XDP_DEVMAP) { 8878 switch (off) { 8879 case offsetof(struct xdp_md, egress_ifindex): 8880 return false; 8881 } 8882 } 8883 8884 if (type == BPF_WRITE) { 8885 if (bpf_prog_is_offloaded(prog->aux)) { 8886 switch (off) { 8887 case offsetof(struct xdp_md, rx_queue_index): 8888 return __is_valid_xdp_access(off, size); 8889 } 8890 } 8891 return false; 8892 } 8893 8894 switch (off) { 8895 case offsetof(struct xdp_md, data): 8896 info->reg_type = PTR_TO_PACKET; 8897 break; 8898 case offsetof(struct xdp_md, data_meta): 8899 info->reg_type = PTR_TO_PACKET_META; 8900 break; 8901 case offsetof(struct xdp_md, data_end): 8902 info->reg_type = PTR_TO_PACKET_END; 8903 break; 8904 } 8905 8906 return __is_valid_xdp_access(off, size); 8907 } 8908 8909 void bpf_warn_invalid_xdp_action(struct net_device *dev, struct bpf_prog *prog, u32 act) 8910 { 8911 const u32 act_max = XDP_REDIRECT; 8912 8913 pr_warn_once("%s XDP return value %u on prog %s (id %d) dev %s, expect packet loss!\n", 8914 act > act_max ? "Illegal" : "Driver unsupported", 8915 act, prog->aux->name, prog->aux->id, dev ? dev->name : "N/A"); 8916 } 8917 EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action); 8918 8919 static int xdp_btf_struct_access(struct bpf_verifier_log *log, 8920 const struct bpf_reg_state *reg, 8921 int off, int size) 8922 { 8923 int ret = -EACCES; 8924 8925 mutex_lock(&nf_conn_btf_access_lock); 8926 if (nfct_btf_struct_access) 8927 ret = nfct_btf_struct_access(log, reg, off, size); 8928 mutex_unlock(&nf_conn_btf_access_lock); 8929 8930 return ret; 8931 } 8932 8933 static bool sock_addr_is_valid_access(int off, int size, 8934 enum bpf_access_type type, 8935 const struct bpf_prog *prog, 8936 struct bpf_insn_access_aux *info) 8937 { 8938 const int size_default = sizeof(__u32); 8939 8940 if (off < 0 || off >= sizeof(struct bpf_sock_addr)) 8941 return false; 8942 if (off % size != 0) 8943 return false; 8944 8945 /* Disallow access to IPv6 fields from IPv4 contex and vise 8946 * versa. 8947 */ 8948 switch (off) { 8949 case bpf_ctx_range(struct bpf_sock_addr, user_ip4): 8950 switch (prog->expected_attach_type) { 8951 case BPF_CGROUP_INET4_BIND: 8952 case BPF_CGROUP_INET4_CONNECT: 8953 case BPF_CGROUP_INET4_GETPEERNAME: 8954 case BPF_CGROUP_INET4_GETSOCKNAME: 8955 case BPF_CGROUP_UDP4_SENDMSG: 8956 case BPF_CGROUP_UDP4_RECVMSG: 8957 break; 8958 default: 8959 return false; 8960 } 8961 break; 8962 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 8963 switch (prog->expected_attach_type) { 8964 case BPF_CGROUP_INET6_BIND: 8965 case BPF_CGROUP_INET6_CONNECT: 8966 case BPF_CGROUP_INET6_GETPEERNAME: 8967 case BPF_CGROUP_INET6_GETSOCKNAME: 8968 case BPF_CGROUP_UDP6_SENDMSG: 8969 case BPF_CGROUP_UDP6_RECVMSG: 8970 break; 8971 default: 8972 return false; 8973 } 8974 break; 8975 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): 8976 switch (prog->expected_attach_type) { 8977 case BPF_CGROUP_UDP4_SENDMSG: 8978 break; 8979 default: 8980 return false; 8981 } 8982 break; 8983 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 8984 msg_src_ip6[3]): 8985 switch (prog->expected_attach_type) { 8986 case BPF_CGROUP_UDP6_SENDMSG: 8987 break; 8988 default: 8989 return false; 8990 } 8991 break; 8992 } 8993 8994 switch (off) { 8995 case bpf_ctx_range(struct bpf_sock_addr, user_ip4): 8996 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 8997 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): 8998 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 8999 msg_src_ip6[3]): 9000 case bpf_ctx_range(struct bpf_sock_addr, user_port): 9001 if (type == BPF_READ) { 9002 bpf_ctx_record_field_size(info, size_default); 9003 9004 if (bpf_ctx_wide_access_ok(off, size, 9005 struct bpf_sock_addr, 9006 user_ip6)) 9007 return true; 9008 9009 if (bpf_ctx_wide_access_ok(off, size, 9010 struct bpf_sock_addr, 9011 msg_src_ip6)) 9012 return true; 9013 9014 if (!bpf_ctx_narrow_access_ok(off, size, size_default)) 9015 return false; 9016 } else { 9017 if (bpf_ctx_wide_access_ok(off, size, 9018 struct bpf_sock_addr, 9019 user_ip6)) 9020 return true; 9021 9022 if (bpf_ctx_wide_access_ok(off, size, 9023 struct bpf_sock_addr, 9024 msg_src_ip6)) 9025 return true; 9026 9027 if (size != size_default) 9028 return false; 9029 } 9030 break; 9031 case offsetof(struct bpf_sock_addr, sk): 9032 if (type != BPF_READ) 9033 return false; 9034 if (size != sizeof(__u64)) 9035 return false; 9036 info->reg_type = PTR_TO_SOCKET; 9037 break; 9038 default: 9039 if (type == BPF_READ) { 9040 if (size != size_default) 9041 return false; 9042 } else { 9043 return false; 9044 } 9045 } 9046 9047 return true; 9048 } 9049 9050 static bool sock_ops_is_valid_access(int off, int size, 9051 enum bpf_access_type type, 9052 const struct bpf_prog *prog, 9053 struct bpf_insn_access_aux *info) 9054 { 9055 const int size_default = sizeof(__u32); 9056 9057 if (off < 0 || off >= sizeof(struct bpf_sock_ops)) 9058 return false; 9059 9060 /* The verifier guarantees that size > 0. */ 9061 if (off % size != 0) 9062 return false; 9063 9064 if (type == BPF_WRITE) { 9065 switch (off) { 9066 case offsetof(struct bpf_sock_ops, reply): 9067 case offsetof(struct bpf_sock_ops, sk_txhash): 9068 if (size != size_default) 9069 return false; 9070 break; 9071 default: 9072 return false; 9073 } 9074 } else { 9075 switch (off) { 9076 case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received, 9077 bytes_acked): 9078 if (size != sizeof(__u64)) 9079 return false; 9080 break; 9081 case offsetof(struct bpf_sock_ops, sk): 9082 if (size != sizeof(__u64)) 9083 return false; 9084 info->reg_type = PTR_TO_SOCKET_OR_NULL; 9085 break; 9086 case offsetof(struct bpf_sock_ops, skb_data): 9087 if (size != sizeof(__u64)) 9088 return false; 9089 info->reg_type = PTR_TO_PACKET; 9090 break; 9091 case offsetof(struct bpf_sock_ops, skb_data_end): 9092 if (size != sizeof(__u64)) 9093 return false; 9094 info->reg_type = PTR_TO_PACKET_END; 9095 break; 9096 case offsetof(struct bpf_sock_ops, skb_tcp_flags): 9097 bpf_ctx_record_field_size(info, size_default); 9098 return bpf_ctx_narrow_access_ok(off, size, 9099 size_default); 9100 case offsetof(struct bpf_sock_ops, skb_hwtstamp): 9101 if (size != sizeof(__u64)) 9102 return false; 9103 break; 9104 default: 9105 if (size != size_default) 9106 return false; 9107 break; 9108 } 9109 } 9110 9111 return true; 9112 } 9113 9114 static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write, 9115 const struct bpf_prog *prog) 9116 { 9117 return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP); 9118 } 9119 9120 static bool sk_skb_is_valid_access(int off, int size, 9121 enum bpf_access_type type, 9122 const struct bpf_prog *prog, 9123 struct bpf_insn_access_aux *info) 9124 { 9125 switch (off) { 9126 case bpf_ctx_range(struct __sk_buff, tc_classid): 9127 case bpf_ctx_range(struct __sk_buff, data_meta): 9128 case bpf_ctx_range(struct __sk_buff, tstamp): 9129 case bpf_ctx_range(struct __sk_buff, wire_len): 9130 case bpf_ctx_range(struct __sk_buff, hwtstamp): 9131 return false; 9132 } 9133 9134 if (type == BPF_WRITE) { 9135 switch (off) { 9136 case bpf_ctx_range(struct __sk_buff, tc_index): 9137 case bpf_ctx_range(struct __sk_buff, priority): 9138 break; 9139 default: 9140 return false; 9141 } 9142 } 9143 9144 switch (off) { 9145 case bpf_ctx_range(struct __sk_buff, mark): 9146 return false; 9147 case bpf_ctx_range(struct __sk_buff, data): 9148 info->reg_type = PTR_TO_PACKET; 9149 break; 9150 case bpf_ctx_range(struct __sk_buff, data_end): 9151 info->reg_type = PTR_TO_PACKET_END; 9152 break; 9153 } 9154 9155 return bpf_skb_is_valid_access(off, size, type, prog, info); 9156 } 9157 9158 static bool sk_msg_is_valid_access(int off, int size, 9159 enum bpf_access_type type, 9160 const struct bpf_prog *prog, 9161 struct bpf_insn_access_aux *info) 9162 { 9163 if (type == BPF_WRITE) 9164 return false; 9165 9166 if (off % size != 0) 9167 return false; 9168 9169 switch (off) { 9170 case offsetof(struct sk_msg_md, data): 9171 info->reg_type = PTR_TO_PACKET; 9172 if (size != sizeof(__u64)) 9173 return false; 9174 break; 9175 case offsetof(struct sk_msg_md, data_end): 9176 info->reg_type = PTR_TO_PACKET_END; 9177 if (size != sizeof(__u64)) 9178 return false; 9179 break; 9180 case offsetof(struct sk_msg_md, sk): 9181 if (size != sizeof(__u64)) 9182 return false; 9183 info->reg_type = PTR_TO_SOCKET; 9184 break; 9185 case bpf_ctx_range(struct sk_msg_md, family): 9186 case bpf_ctx_range(struct sk_msg_md, remote_ip4): 9187 case bpf_ctx_range(struct sk_msg_md, local_ip4): 9188 case bpf_ctx_range_till(struct sk_msg_md, remote_ip6[0], remote_ip6[3]): 9189 case bpf_ctx_range_till(struct sk_msg_md, local_ip6[0], local_ip6[3]): 9190 case bpf_ctx_range(struct sk_msg_md, remote_port): 9191 case bpf_ctx_range(struct sk_msg_md, local_port): 9192 case bpf_ctx_range(struct sk_msg_md, size): 9193 if (size != sizeof(__u32)) 9194 return false; 9195 break; 9196 default: 9197 return false; 9198 } 9199 return true; 9200 } 9201 9202 static bool flow_dissector_is_valid_access(int off, int size, 9203 enum bpf_access_type type, 9204 const struct bpf_prog *prog, 9205 struct bpf_insn_access_aux *info) 9206 { 9207 const int size_default = sizeof(__u32); 9208 9209 if (off < 0 || off >= sizeof(struct __sk_buff)) 9210 return false; 9211 9212 if (type == BPF_WRITE) 9213 return false; 9214 9215 switch (off) { 9216 case bpf_ctx_range(struct __sk_buff, data): 9217 if (size != size_default) 9218 return false; 9219 info->reg_type = PTR_TO_PACKET; 9220 return true; 9221 case bpf_ctx_range(struct __sk_buff, data_end): 9222 if (size != size_default) 9223 return false; 9224 info->reg_type = PTR_TO_PACKET_END; 9225 return true; 9226 case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): 9227 if (size != sizeof(__u64)) 9228 return false; 9229 info->reg_type = PTR_TO_FLOW_KEYS; 9230 return true; 9231 default: 9232 return false; 9233 } 9234 } 9235 9236 static u32 flow_dissector_convert_ctx_access(enum bpf_access_type type, 9237 const struct bpf_insn *si, 9238 struct bpf_insn *insn_buf, 9239 struct bpf_prog *prog, 9240 u32 *target_size) 9241 9242 { 9243 struct bpf_insn *insn = insn_buf; 9244 9245 switch (si->off) { 9246 case offsetof(struct __sk_buff, data): 9247 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data), 9248 si->dst_reg, si->src_reg, 9249 offsetof(struct bpf_flow_dissector, data)); 9250 break; 9251 9252 case offsetof(struct __sk_buff, data_end): 9253 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data_end), 9254 si->dst_reg, si->src_reg, 9255 offsetof(struct bpf_flow_dissector, data_end)); 9256 break; 9257 9258 case offsetof(struct __sk_buff, flow_keys): 9259 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, flow_keys), 9260 si->dst_reg, si->src_reg, 9261 offsetof(struct bpf_flow_dissector, flow_keys)); 9262 break; 9263 } 9264 9265 return insn - insn_buf; 9266 } 9267 9268 static struct bpf_insn *bpf_convert_tstamp_type_read(const struct bpf_insn *si, 9269 struct bpf_insn *insn) 9270 { 9271 __u8 value_reg = si->dst_reg; 9272 __u8 skb_reg = si->src_reg; 9273 /* AX is needed because src_reg and dst_reg could be the same */ 9274 __u8 tmp_reg = BPF_REG_AX; 9275 9276 *insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg, 9277 SKB_BF_MONO_TC_OFFSET); 9278 *insn++ = BPF_JMP32_IMM(BPF_JSET, tmp_reg, 9279 SKB_MONO_DELIVERY_TIME_MASK, 2); 9280 *insn++ = BPF_MOV32_IMM(value_reg, BPF_SKB_TSTAMP_UNSPEC); 9281 *insn++ = BPF_JMP_A(1); 9282 *insn++ = BPF_MOV32_IMM(value_reg, BPF_SKB_TSTAMP_DELIVERY_MONO); 9283 9284 return insn; 9285 } 9286 9287 static struct bpf_insn *bpf_convert_shinfo_access(__u8 dst_reg, __u8 skb_reg, 9288 struct bpf_insn *insn) 9289 { 9290 /* si->dst_reg = skb_shinfo(SKB); */ 9291 #ifdef NET_SKBUFF_DATA_USES_OFFSET 9292 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), 9293 BPF_REG_AX, skb_reg, 9294 offsetof(struct sk_buff, end)); 9295 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, head), 9296 dst_reg, skb_reg, 9297 offsetof(struct sk_buff, head)); 9298 *insn++ = BPF_ALU64_REG(BPF_ADD, dst_reg, BPF_REG_AX); 9299 #else 9300 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), 9301 dst_reg, skb_reg, 9302 offsetof(struct sk_buff, end)); 9303 #endif 9304 9305 return insn; 9306 } 9307 9308 static struct bpf_insn *bpf_convert_tstamp_read(const struct bpf_prog *prog, 9309 const struct bpf_insn *si, 9310 struct bpf_insn *insn) 9311 { 9312 __u8 value_reg = si->dst_reg; 9313 __u8 skb_reg = si->src_reg; 9314 9315 #ifdef CONFIG_NET_CLS_ACT 9316 /* If the tstamp_type is read, 9317 * the bpf prog is aware the tstamp could have delivery time. 9318 * Thus, read skb->tstamp as is if tstamp_type_access is true. 9319 */ 9320 if (!prog->tstamp_type_access) { 9321 /* AX is needed because src_reg and dst_reg could be the same */ 9322 __u8 tmp_reg = BPF_REG_AX; 9323 9324 *insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg, SKB_BF_MONO_TC_OFFSET); 9325 *insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg, 9326 TC_AT_INGRESS_MASK | SKB_MONO_DELIVERY_TIME_MASK); 9327 *insn++ = BPF_JMP32_IMM(BPF_JNE, tmp_reg, 9328 TC_AT_INGRESS_MASK | SKB_MONO_DELIVERY_TIME_MASK, 2); 9329 /* skb->tc_at_ingress && skb->mono_delivery_time, 9330 * read 0 as the (rcv) timestamp. 9331 */ 9332 *insn++ = BPF_MOV64_IMM(value_reg, 0); 9333 *insn++ = BPF_JMP_A(1); 9334 } 9335 #endif 9336 9337 *insn++ = BPF_LDX_MEM(BPF_DW, value_reg, skb_reg, 9338 offsetof(struct sk_buff, tstamp)); 9339 return insn; 9340 } 9341 9342 static struct bpf_insn *bpf_convert_tstamp_write(const struct bpf_prog *prog, 9343 const struct bpf_insn *si, 9344 struct bpf_insn *insn) 9345 { 9346 __u8 value_reg = si->src_reg; 9347 __u8 skb_reg = si->dst_reg; 9348 9349 #ifdef CONFIG_NET_CLS_ACT 9350 /* If the tstamp_type is read, 9351 * the bpf prog is aware the tstamp could have delivery time. 9352 * Thus, write skb->tstamp as is if tstamp_type_access is true. 9353 * Otherwise, writing at ingress will have to clear the 9354 * mono_delivery_time bit also. 9355 */ 9356 if (!prog->tstamp_type_access) { 9357 __u8 tmp_reg = BPF_REG_AX; 9358 9359 *insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg, SKB_BF_MONO_TC_OFFSET); 9360 /* Writing __sk_buff->tstamp as ingress, goto <clear> */ 9361 *insn++ = BPF_JMP32_IMM(BPF_JSET, tmp_reg, TC_AT_INGRESS_MASK, 1); 9362 /* goto <store> */ 9363 *insn++ = BPF_JMP_A(2); 9364 /* <clear>: mono_delivery_time */ 9365 *insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg, ~SKB_MONO_DELIVERY_TIME_MASK); 9366 *insn++ = BPF_STX_MEM(BPF_B, skb_reg, tmp_reg, SKB_BF_MONO_TC_OFFSET); 9367 } 9368 #endif 9369 9370 /* <store>: skb->tstamp = tstamp */ 9371 *insn++ = BPF_RAW_INSN(BPF_CLASS(si->code) | BPF_DW | BPF_MEM, 9372 skb_reg, value_reg, offsetof(struct sk_buff, tstamp), si->imm); 9373 return insn; 9374 } 9375 9376 #define BPF_EMIT_STORE(size, si, off) \ 9377 BPF_RAW_INSN(BPF_CLASS((si)->code) | (size) | BPF_MEM, \ 9378 (si)->dst_reg, (si)->src_reg, (off), (si)->imm) 9379 9380 static u32 bpf_convert_ctx_access(enum bpf_access_type type, 9381 const struct bpf_insn *si, 9382 struct bpf_insn *insn_buf, 9383 struct bpf_prog *prog, u32 *target_size) 9384 { 9385 struct bpf_insn *insn = insn_buf; 9386 int off; 9387 9388 switch (si->off) { 9389 case offsetof(struct __sk_buff, len): 9390 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9391 bpf_target_off(struct sk_buff, len, 4, 9392 target_size)); 9393 break; 9394 9395 case offsetof(struct __sk_buff, protocol): 9396 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9397 bpf_target_off(struct sk_buff, protocol, 2, 9398 target_size)); 9399 break; 9400 9401 case offsetof(struct __sk_buff, vlan_proto): 9402 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9403 bpf_target_off(struct sk_buff, vlan_proto, 2, 9404 target_size)); 9405 break; 9406 9407 case offsetof(struct __sk_buff, priority): 9408 if (type == BPF_WRITE) 9409 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9410 bpf_target_off(struct sk_buff, priority, 4, 9411 target_size)); 9412 else 9413 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9414 bpf_target_off(struct sk_buff, priority, 4, 9415 target_size)); 9416 break; 9417 9418 case offsetof(struct __sk_buff, ingress_ifindex): 9419 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9420 bpf_target_off(struct sk_buff, skb_iif, 4, 9421 target_size)); 9422 break; 9423 9424 case offsetof(struct __sk_buff, ifindex): 9425 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 9426 si->dst_reg, si->src_reg, 9427 offsetof(struct sk_buff, dev)); 9428 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 9429 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9430 bpf_target_off(struct net_device, ifindex, 4, 9431 target_size)); 9432 break; 9433 9434 case offsetof(struct __sk_buff, hash): 9435 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9436 bpf_target_off(struct sk_buff, hash, 4, 9437 target_size)); 9438 break; 9439 9440 case offsetof(struct __sk_buff, mark): 9441 if (type == BPF_WRITE) 9442 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9443 bpf_target_off(struct sk_buff, mark, 4, 9444 target_size)); 9445 else 9446 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9447 bpf_target_off(struct sk_buff, mark, 4, 9448 target_size)); 9449 break; 9450 9451 case offsetof(struct __sk_buff, pkt_type): 9452 *target_size = 1; 9453 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, 9454 PKT_TYPE_OFFSET); 9455 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX); 9456 #ifdef __BIG_ENDIAN_BITFIELD 9457 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5); 9458 #endif 9459 break; 9460 9461 case offsetof(struct __sk_buff, queue_mapping): 9462 if (type == BPF_WRITE) { 9463 u32 off = bpf_target_off(struct sk_buff, queue_mapping, 2, target_size); 9464 9465 if (BPF_CLASS(si->code) == BPF_ST && si->imm >= NO_QUEUE_MAPPING) { 9466 *insn++ = BPF_JMP_A(0); /* noop */ 9467 break; 9468 } 9469 9470 if (BPF_CLASS(si->code) == BPF_STX) 9471 *insn++ = BPF_JMP_IMM(BPF_JGE, si->src_reg, NO_QUEUE_MAPPING, 1); 9472 *insn++ = BPF_EMIT_STORE(BPF_H, si, off); 9473 } else { 9474 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9475 bpf_target_off(struct sk_buff, 9476 queue_mapping, 9477 2, target_size)); 9478 } 9479 break; 9480 9481 case offsetof(struct __sk_buff, vlan_present): 9482 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9483 bpf_target_off(struct sk_buff, 9484 vlan_all, 4, target_size)); 9485 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 9486 *insn++ = BPF_ALU32_IMM(BPF_MOV, si->dst_reg, 1); 9487 break; 9488 9489 case offsetof(struct __sk_buff, vlan_tci): 9490 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9491 bpf_target_off(struct sk_buff, vlan_tci, 2, 9492 target_size)); 9493 break; 9494 9495 case offsetof(struct __sk_buff, cb[0]) ... 9496 offsetofend(struct __sk_buff, cb[4]) - 1: 9497 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, data) < 20); 9498 BUILD_BUG_ON((offsetof(struct sk_buff, cb) + 9499 offsetof(struct qdisc_skb_cb, data)) % 9500 sizeof(__u64)); 9501 9502 prog->cb_access = 1; 9503 off = si->off; 9504 off -= offsetof(struct __sk_buff, cb[0]); 9505 off += offsetof(struct sk_buff, cb); 9506 off += offsetof(struct qdisc_skb_cb, data); 9507 if (type == BPF_WRITE) 9508 *insn++ = BPF_EMIT_STORE(BPF_SIZE(si->code), si, off); 9509 else 9510 *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg, 9511 si->src_reg, off); 9512 break; 9513 9514 case offsetof(struct __sk_buff, tc_classid): 9515 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, tc_classid) != 2); 9516 9517 off = si->off; 9518 off -= offsetof(struct __sk_buff, tc_classid); 9519 off += offsetof(struct sk_buff, cb); 9520 off += offsetof(struct qdisc_skb_cb, tc_classid); 9521 *target_size = 2; 9522 if (type == BPF_WRITE) 9523 *insn++ = BPF_EMIT_STORE(BPF_H, si, off); 9524 else 9525 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, 9526 si->src_reg, off); 9527 break; 9528 9529 case offsetof(struct __sk_buff, data): 9530 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 9531 si->dst_reg, si->src_reg, 9532 offsetof(struct sk_buff, data)); 9533 break; 9534 9535 case offsetof(struct __sk_buff, data_meta): 9536 off = si->off; 9537 off -= offsetof(struct __sk_buff, data_meta); 9538 off += offsetof(struct sk_buff, cb); 9539 off += offsetof(struct bpf_skb_data_end, data_meta); 9540 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, 9541 si->src_reg, off); 9542 break; 9543 9544 case offsetof(struct __sk_buff, data_end): 9545 off = si->off; 9546 off -= offsetof(struct __sk_buff, data_end); 9547 off += offsetof(struct sk_buff, cb); 9548 off += offsetof(struct bpf_skb_data_end, data_end); 9549 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, 9550 si->src_reg, off); 9551 break; 9552 9553 case offsetof(struct __sk_buff, tc_index): 9554 #ifdef CONFIG_NET_SCHED 9555 if (type == BPF_WRITE) 9556 *insn++ = BPF_EMIT_STORE(BPF_H, si, 9557 bpf_target_off(struct sk_buff, tc_index, 2, 9558 target_size)); 9559 else 9560 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9561 bpf_target_off(struct sk_buff, tc_index, 2, 9562 target_size)); 9563 #else 9564 *target_size = 2; 9565 if (type == BPF_WRITE) 9566 *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg); 9567 else 9568 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 9569 #endif 9570 break; 9571 9572 case offsetof(struct __sk_buff, napi_id): 9573 #if defined(CONFIG_NET_RX_BUSY_POLL) 9574 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9575 bpf_target_off(struct sk_buff, napi_id, 4, 9576 target_size)); 9577 *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1); 9578 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 9579 #else 9580 *target_size = 4; 9581 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 9582 #endif 9583 break; 9584 case offsetof(struct __sk_buff, family): 9585 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); 9586 9587 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9588 si->dst_reg, si->src_reg, 9589 offsetof(struct sk_buff, sk)); 9590 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 9591 bpf_target_off(struct sock_common, 9592 skc_family, 9593 2, target_size)); 9594 break; 9595 case offsetof(struct __sk_buff, remote_ip4): 9596 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); 9597 9598 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9599 si->dst_reg, si->src_reg, 9600 offsetof(struct sk_buff, sk)); 9601 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9602 bpf_target_off(struct sock_common, 9603 skc_daddr, 9604 4, target_size)); 9605 break; 9606 case offsetof(struct __sk_buff, local_ip4): 9607 BUILD_BUG_ON(sizeof_field(struct sock_common, 9608 skc_rcv_saddr) != 4); 9609 9610 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9611 si->dst_reg, si->src_reg, 9612 offsetof(struct sk_buff, sk)); 9613 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9614 bpf_target_off(struct sock_common, 9615 skc_rcv_saddr, 9616 4, target_size)); 9617 break; 9618 case offsetof(struct __sk_buff, remote_ip6[0]) ... 9619 offsetof(struct __sk_buff, remote_ip6[3]): 9620 #if IS_ENABLED(CONFIG_IPV6) 9621 BUILD_BUG_ON(sizeof_field(struct sock_common, 9622 skc_v6_daddr.s6_addr32[0]) != 4); 9623 9624 off = si->off; 9625 off -= offsetof(struct __sk_buff, remote_ip6[0]); 9626 9627 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9628 si->dst_reg, si->src_reg, 9629 offsetof(struct sk_buff, sk)); 9630 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9631 offsetof(struct sock_common, 9632 skc_v6_daddr.s6_addr32[0]) + 9633 off); 9634 #else 9635 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9636 #endif 9637 break; 9638 case offsetof(struct __sk_buff, local_ip6[0]) ... 9639 offsetof(struct __sk_buff, local_ip6[3]): 9640 #if IS_ENABLED(CONFIG_IPV6) 9641 BUILD_BUG_ON(sizeof_field(struct sock_common, 9642 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 9643 9644 off = si->off; 9645 off -= offsetof(struct __sk_buff, local_ip6[0]); 9646 9647 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9648 si->dst_reg, si->src_reg, 9649 offsetof(struct sk_buff, sk)); 9650 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9651 offsetof(struct sock_common, 9652 skc_v6_rcv_saddr.s6_addr32[0]) + 9653 off); 9654 #else 9655 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9656 #endif 9657 break; 9658 9659 case offsetof(struct __sk_buff, remote_port): 9660 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); 9661 9662 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9663 si->dst_reg, si->src_reg, 9664 offsetof(struct sk_buff, sk)); 9665 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 9666 bpf_target_off(struct sock_common, 9667 skc_dport, 9668 2, target_size)); 9669 #ifndef __BIG_ENDIAN_BITFIELD 9670 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 9671 #endif 9672 break; 9673 9674 case offsetof(struct __sk_buff, local_port): 9675 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); 9676 9677 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9678 si->dst_reg, si->src_reg, 9679 offsetof(struct sk_buff, sk)); 9680 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 9681 bpf_target_off(struct sock_common, 9682 skc_num, 2, target_size)); 9683 break; 9684 9685 case offsetof(struct __sk_buff, tstamp): 9686 BUILD_BUG_ON(sizeof_field(struct sk_buff, tstamp) != 8); 9687 9688 if (type == BPF_WRITE) 9689 insn = bpf_convert_tstamp_write(prog, si, insn); 9690 else 9691 insn = bpf_convert_tstamp_read(prog, si, insn); 9692 break; 9693 9694 case offsetof(struct __sk_buff, tstamp_type): 9695 insn = bpf_convert_tstamp_type_read(si, insn); 9696 break; 9697 9698 case offsetof(struct __sk_buff, gso_segs): 9699 insn = bpf_convert_shinfo_access(si->dst_reg, si->src_reg, insn); 9700 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_segs), 9701 si->dst_reg, si->dst_reg, 9702 bpf_target_off(struct skb_shared_info, 9703 gso_segs, 2, 9704 target_size)); 9705 break; 9706 case offsetof(struct __sk_buff, gso_size): 9707 insn = bpf_convert_shinfo_access(si->dst_reg, si->src_reg, insn); 9708 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_size), 9709 si->dst_reg, si->dst_reg, 9710 bpf_target_off(struct skb_shared_info, 9711 gso_size, 2, 9712 target_size)); 9713 break; 9714 case offsetof(struct __sk_buff, wire_len): 9715 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, pkt_len) != 4); 9716 9717 off = si->off; 9718 off -= offsetof(struct __sk_buff, wire_len); 9719 off += offsetof(struct sk_buff, cb); 9720 off += offsetof(struct qdisc_skb_cb, pkt_len); 9721 *target_size = 4; 9722 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, off); 9723 break; 9724 9725 case offsetof(struct __sk_buff, sk): 9726 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9727 si->dst_reg, si->src_reg, 9728 offsetof(struct sk_buff, sk)); 9729 break; 9730 case offsetof(struct __sk_buff, hwtstamp): 9731 BUILD_BUG_ON(sizeof_field(struct skb_shared_hwtstamps, hwtstamp) != 8); 9732 BUILD_BUG_ON(offsetof(struct skb_shared_hwtstamps, hwtstamp) != 0); 9733 9734 insn = bpf_convert_shinfo_access(si->dst_reg, si->src_reg, insn); 9735 *insn++ = BPF_LDX_MEM(BPF_DW, 9736 si->dst_reg, si->dst_reg, 9737 bpf_target_off(struct skb_shared_info, 9738 hwtstamps, 8, 9739 target_size)); 9740 break; 9741 } 9742 9743 return insn - insn_buf; 9744 } 9745 9746 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 9747 const struct bpf_insn *si, 9748 struct bpf_insn *insn_buf, 9749 struct bpf_prog *prog, u32 *target_size) 9750 { 9751 struct bpf_insn *insn = insn_buf; 9752 int off; 9753 9754 switch (si->off) { 9755 case offsetof(struct bpf_sock, bound_dev_if): 9756 BUILD_BUG_ON(sizeof_field(struct sock, sk_bound_dev_if) != 4); 9757 9758 if (type == BPF_WRITE) 9759 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9760 offsetof(struct sock, sk_bound_dev_if)); 9761 else 9762 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9763 offsetof(struct sock, sk_bound_dev_if)); 9764 break; 9765 9766 case offsetof(struct bpf_sock, mark): 9767 BUILD_BUG_ON(sizeof_field(struct sock, sk_mark) != 4); 9768 9769 if (type == BPF_WRITE) 9770 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9771 offsetof(struct sock, sk_mark)); 9772 else 9773 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9774 offsetof(struct sock, sk_mark)); 9775 break; 9776 9777 case offsetof(struct bpf_sock, priority): 9778 BUILD_BUG_ON(sizeof_field(struct sock, sk_priority) != 4); 9779 9780 if (type == BPF_WRITE) 9781 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9782 offsetof(struct sock, sk_priority)); 9783 else 9784 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9785 offsetof(struct sock, sk_priority)); 9786 break; 9787 9788 case offsetof(struct bpf_sock, family): 9789 *insn++ = BPF_LDX_MEM( 9790 BPF_FIELD_SIZEOF(struct sock_common, skc_family), 9791 si->dst_reg, si->src_reg, 9792 bpf_target_off(struct sock_common, 9793 skc_family, 9794 sizeof_field(struct sock_common, 9795 skc_family), 9796 target_size)); 9797 break; 9798 9799 case offsetof(struct bpf_sock, type): 9800 *insn++ = BPF_LDX_MEM( 9801 BPF_FIELD_SIZEOF(struct sock, sk_type), 9802 si->dst_reg, si->src_reg, 9803 bpf_target_off(struct sock, sk_type, 9804 sizeof_field(struct sock, sk_type), 9805 target_size)); 9806 break; 9807 9808 case offsetof(struct bpf_sock, protocol): 9809 *insn++ = BPF_LDX_MEM( 9810 BPF_FIELD_SIZEOF(struct sock, sk_protocol), 9811 si->dst_reg, si->src_reg, 9812 bpf_target_off(struct sock, sk_protocol, 9813 sizeof_field(struct sock, sk_protocol), 9814 target_size)); 9815 break; 9816 9817 case offsetof(struct bpf_sock, src_ip4): 9818 *insn++ = BPF_LDX_MEM( 9819 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 9820 bpf_target_off(struct sock_common, skc_rcv_saddr, 9821 sizeof_field(struct sock_common, 9822 skc_rcv_saddr), 9823 target_size)); 9824 break; 9825 9826 case offsetof(struct bpf_sock, dst_ip4): 9827 *insn++ = BPF_LDX_MEM( 9828 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 9829 bpf_target_off(struct sock_common, skc_daddr, 9830 sizeof_field(struct sock_common, 9831 skc_daddr), 9832 target_size)); 9833 break; 9834 9835 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 9836 #if IS_ENABLED(CONFIG_IPV6) 9837 off = si->off; 9838 off -= offsetof(struct bpf_sock, src_ip6[0]); 9839 *insn++ = BPF_LDX_MEM( 9840 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 9841 bpf_target_off( 9842 struct sock_common, 9843 skc_v6_rcv_saddr.s6_addr32[0], 9844 sizeof_field(struct sock_common, 9845 skc_v6_rcv_saddr.s6_addr32[0]), 9846 target_size) + off); 9847 #else 9848 (void)off; 9849 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9850 #endif 9851 break; 9852 9853 case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): 9854 #if IS_ENABLED(CONFIG_IPV6) 9855 off = si->off; 9856 off -= offsetof(struct bpf_sock, dst_ip6[0]); 9857 *insn++ = BPF_LDX_MEM( 9858 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 9859 bpf_target_off(struct sock_common, 9860 skc_v6_daddr.s6_addr32[0], 9861 sizeof_field(struct sock_common, 9862 skc_v6_daddr.s6_addr32[0]), 9863 target_size) + off); 9864 #else 9865 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9866 *target_size = 4; 9867 #endif 9868 break; 9869 9870 case offsetof(struct bpf_sock, src_port): 9871 *insn++ = BPF_LDX_MEM( 9872 BPF_FIELD_SIZEOF(struct sock_common, skc_num), 9873 si->dst_reg, si->src_reg, 9874 bpf_target_off(struct sock_common, skc_num, 9875 sizeof_field(struct sock_common, 9876 skc_num), 9877 target_size)); 9878 break; 9879 9880 case offsetof(struct bpf_sock, dst_port): 9881 *insn++ = BPF_LDX_MEM( 9882 BPF_FIELD_SIZEOF(struct sock_common, skc_dport), 9883 si->dst_reg, si->src_reg, 9884 bpf_target_off(struct sock_common, skc_dport, 9885 sizeof_field(struct sock_common, 9886 skc_dport), 9887 target_size)); 9888 break; 9889 9890 case offsetof(struct bpf_sock, state): 9891 *insn++ = BPF_LDX_MEM( 9892 BPF_FIELD_SIZEOF(struct sock_common, skc_state), 9893 si->dst_reg, si->src_reg, 9894 bpf_target_off(struct sock_common, skc_state, 9895 sizeof_field(struct sock_common, 9896 skc_state), 9897 target_size)); 9898 break; 9899 case offsetof(struct bpf_sock, rx_queue_mapping): 9900 #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING 9901 *insn++ = BPF_LDX_MEM( 9902 BPF_FIELD_SIZEOF(struct sock, sk_rx_queue_mapping), 9903 si->dst_reg, si->src_reg, 9904 bpf_target_off(struct sock, sk_rx_queue_mapping, 9905 sizeof_field(struct sock, 9906 sk_rx_queue_mapping), 9907 target_size)); 9908 *insn++ = BPF_JMP_IMM(BPF_JNE, si->dst_reg, NO_QUEUE_MAPPING, 9909 1); 9910 *insn++ = BPF_MOV64_IMM(si->dst_reg, -1); 9911 #else 9912 *insn++ = BPF_MOV64_IMM(si->dst_reg, -1); 9913 *target_size = 2; 9914 #endif 9915 break; 9916 } 9917 9918 return insn - insn_buf; 9919 } 9920 9921 static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type, 9922 const struct bpf_insn *si, 9923 struct bpf_insn *insn_buf, 9924 struct bpf_prog *prog, u32 *target_size) 9925 { 9926 struct bpf_insn *insn = insn_buf; 9927 9928 switch (si->off) { 9929 case offsetof(struct __sk_buff, ifindex): 9930 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 9931 si->dst_reg, si->src_reg, 9932 offsetof(struct sk_buff, dev)); 9933 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9934 bpf_target_off(struct net_device, ifindex, 4, 9935 target_size)); 9936 break; 9937 default: 9938 return bpf_convert_ctx_access(type, si, insn_buf, prog, 9939 target_size); 9940 } 9941 9942 return insn - insn_buf; 9943 } 9944 9945 static u32 xdp_convert_ctx_access(enum bpf_access_type type, 9946 const struct bpf_insn *si, 9947 struct bpf_insn *insn_buf, 9948 struct bpf_prog *prog, u32 *target_size) 9949 { 9950 struct bpf_insn *insn = insn_buf; 9951 9952 switch (si->off) { 9953 case offsetof(struct xdp_md, data): 9954 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data), 9955 si->dst_reg, si->src_reg, 9956 offsetof(struct xdp_buff, data)); 9957 break; 9958 case offsetof(struct xdp_md, data_meta): 9959 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta), 9960 si->dst_reg, si->src_reg, 9961 offsetof(struct xdp_buff, data_meta)); 9962 break; 9963 case offsetof(struct xdp_md, data_end): 9964 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end), 9965 si->dst_reg, si->src_reg, 9966 offsetof(struct xdp_buff, data_end)); 9967 break; 9968 case offsetof(struct xdp_md, ingress_ifindex): 9969 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), 9970 si->dst_reg, si->src_reg, 9971 offsetof(struct xdp_buff, rxq)); 9972 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev), 9973 si->dst_reg, si->dst_reg, 9974 offsetof(struct xdp_rxq_info, dev)); 9975 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9976 offsetof(struct net_device, ifindex)); 9977 break; 9978 case offsetof(struct xdp_md, rx_queue_index): 9979 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), 9980 si->dst_reg, si->src_reg, 9981 offsetof(struct xdp_buff, rxq)); 9982 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9983 offsetof(struct xdp_rxq_info, 9984 queue_index)); 9985 break; 9986 case offsetof(struct xdp_md, egress_ifindex): 9987 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, txq), 9988 si->dst_reg, si->src_reg, 9989 offsetof(struct xdp_buff, txq)); 9990 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_txq_info, dev), 9991 si->dst_reg, si->dst_reg, 9992 offsetof(struct xdp_txq_info, dev)); 9993 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9994 offsetof(struct net_device, ifindex)); 9995 break; 9996 } 9997 9998 return insn - insn_buf; 9999 } 10000 10001 /* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of 10002 * context Structure, F is Field in context structure that contains a pointer 10003 * to Nested Structure of type NS that has the field NF. 10004 * 10005 * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make 10006 * sure that SIZE is not greater than actual size of S.F.NF. 10007 * 10008 * If offset OFF is provided, the load happens from that offset relative to 10009 * offset of NF. 10010 */ 10011 #define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF) \ 10012 do { \ 10013 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg, \ 10014 si->src_reg, offsetof(S, F)); \ 10015 *insn++ = BPF_LDX_MEM( \ 10016 SIZE, si->dst_reg, si->dst_reg, \ 10017 bpf_target_off(NS, NF, sizeof_field(NS, NF), \ 10018 target_size) \ 10019 + OFF); \ 10020 } while (0) 10021 10022 #define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF) \ 10023 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, \ 10024 BPF_FIELD_SIZEOF(NS, NF), 0) 10025 10026 /* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to 10027 * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation. 10028 * 10029 * In addition it uses Temporary Field TF (member of struct S) as the 3rd 10030 * "register" since two registers available in convert_ctx_access are not 10031 * enough: we can't override neither SRC, since it contains value to store, nor 10032 * DST since it contains pointer to context that may be used by later 10033 * instructions. But we need a temporary place to save pointer to nested 10034 * structure whose field we want to store to. 10035 */ 10036 #define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, OFF, TF) \ 10037 do { \ 10038 int tmp_reg = BPF_REG_9; \ 10039 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ 10040 --tmp_reg; \ 10041 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ 10042 --tmp_reg; \ 10043 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg, \ 10044 offsetof(S, TF)); \ 10045 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg, \ 10046 si->dst_reg, offsetof(S, F)); \ 10047 *insn++ = BPF_RAW_INSN(SIZE | BPF_MEM | BPF_CLASS(si->code), \ 10048 tmp_reg, si->src_reg, \ 10049 bpf_target_off(NS, NF, sizeof_field(NS, NF), \ 10050 target_size) \ 10051 + OFF, \ 10052 si->imm); \ 10053 *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg, \ 10054 offsetof(S, TF)); \ 10055 } while (0) 10056 10057 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \ 10058 TF) \ 10059 do { \ 10060 if (type == BPF_WRITE) { \ 10061 SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, \ 10062 OFF, TF); \ 10063 } else { \ 10064 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( \ 10065 S, NS, F, NF, SIZE, OFF); \ 10066 } \ 10067 } while (0) 10068 10069 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF) \ 10070 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( \ 10071 S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF) 10072 10073 static u32 sock_addr_convert_ctx_access(enum bpf_access_type type, 10074 const struct bpf_insn *si, 10075 struct bpf_insn *insn_buf, 10076 struct bpf_prog *prog, u32 *target_size) 10077 { 10078 int off, port_size = sizeof_field(struct sockaddr_in6, sin6_port); 10079 struct bpf_insn *insn = insn_buf; 10080 10081 switch (si->off) { 10082 case offsetof(struct bpf_sock_addr, user_family): 10083 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 10084 struct sockaddr, uaddr, sa_family); 10085 break; 10086 10087 case offsetof(struct bpf_sock_addr, user_ip4): 10088 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10089 struct bpf_sock_addr_kern, struct sockaddr_in, uaddr, 10090 sin_addr, BPF_SIZE(si->code), 0, tmp_reg); 10091 break; 10092 10093 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 10094 off = si->off; 10095 off -= offsetof(struct bpf_sock_addr, user_ip6[0]); 10096 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10097 struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr, 10098 sin6_addr.s6_addr32[0], BPF_SIZE(si->code), off, 10099 tmp_reg); 10100 break; 10101 10102 case offsetof(struct bpf_sock_addr, user_port): 10103 /* To get port we need to know sa_family first and then treat 10104 * sockaddr as either sockaddr_in or sockaddr_in6. 10105 * Though we can simplify since port field has same offset and 10106 * size in both structures. 10107 * Here we check this invariant and use just one of the 10108 * structures if it's true. 10109 */ 10110 BUILD_BUG_ON(offsetof(struct sockaddr_in, sin_port) != 10111 offsetof(struct sockaddr_in6, sin6_port)); 10112 BUILD_BUG_ON(sizeof_field(struct sockaddr_in, sin_port) != 10113 sizeof_field(struct sockaddr_in6, sin6_port)); 10114 /* Account for sin6_port being smaller than user_port. */ 10115 port_size = min(port_size, BPF_LDST_BYTES(si)); 10116 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10117 struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr, 10118 sin6_port, bytes_to_bpf_size(port_size), 0, tmp_reg); 10119 break; 10120 10121 case offsetof(struct bpf_sock_addr, family): 10122 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 10123 struct sock, sk, sk_family); 10124 break; 10125 10126 case offsetof(struct bpf_sock_addr, type): 10127 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 10128 struct sock, sk, sk_type); 10129 break; 10130 10131 case offsetof(struct bpf_sock_addr, protocol): 10132 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 10133 struct sock, sk, sk_protocol); 10134 break; 10135 10136 case offsetof(struct bpf_sock_addr, msg_src_ip4): 10137 /* Treat t_ctx as struct in_addr for msg_src_ip4. */ 10138 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10139 struct bpf_sock_addr_kern, struct in_addr, t_ctx, 10140 s_addr, BPF_SIZE(si->code), 0, tmp_reg); 10141 break; 10142 10143 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 10144 msg_src_ip6[3]): 10145 off = si->off; 10146 off -= offsetof(struct bpf_sock_addr, msg_src_ip6[0]); 10147 /* Treat t_ctx as struct in6_addr for msg_src_ip6. */ 10148 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10149 struct bpf_sock_addr_kern, struct in6_addr, t_ctx, 10150 s6_addr32[0], BPF_SIZE(si->code), off, tmp_reg); 10151 break; 10152 case offsetof(struct bpf_sock_addr, sk): 10153 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_addr_kern, sk), 10154 si->dst_reg, si->src_reg, 10155 offsetof(struct bpf_sock_addr_kern, sk)); 10156 break; 10157 } 10158 10159 return insn - insn_buf; 10160 } 10161 10162 static u32 sock_ops_convert_ctx_access(enum bpf_access_type type, 10163 const struct bpf_insn *si, 10164 struct bpf_insn *insn_buf, 10165 struct bpf_prog *prog, 10166 u32 *target_size) 10167 { 10168 struct bpf_insn *insn = insn_buf; 10169 int off; 10170 10171 /* Helper macro for adding read access to tcp_sock or sock fields. */ 10172 #define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ 10173 do { \ 10174 int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 2; \ 10175 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \ 10176 sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \ 10177 if (si->dst_reg == reg || si->src_reg == reg) \ 10178 reg--; \ 10179 if (si->dst_reg == reg || si->src_reg == reg) \ 10180 reg--; \ 10181 if (si->dst_reg == si->src_reg) { \ 10182 *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, \ 10183 offsetof(struct bpf_sock_ops_kern, \ 10184 temp)); \ 10185 fullsock_reg = reg; \ 10186 jmp += 2; \ 10187 } \ 10188 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10189 struct bpf_sock_ops_kern, \ 10190 is_fullsock), \ 10191 fullsock_reg, si->src_reg, \ 10192 offsetof(struct bpf_sock_ops_kern, \ 10193 is_fullsock)); \ 10194 *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp); \ 10195 if (si->dst_reg == si->src_reg) \ 10196 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 10197 offsetof(struct bpf_sock_ops_kern, \ 10198 temp)); \ 10199 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10200 struct bpf_sock_ops_kern, sk),\ 10201 si->dst_reg, si->src_reg, \ 10202 offsetof(struct bpf_sock_ops_kern, sk));\ 10203 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ, \ 10204 OBJ_FIELD), \ 10205 si->dst_reg, si->dst_reg, \ 10206 offsetof(OBJ, OBJ_FIELD)); \ 10207 if (si->dst_reg == si->src_reg) { \ 10208 *insn++ = BPF_JMP_A(1); \ 10209 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 10210 offsetof(struct bpf_sock_ops_kern, \ 10211 temp)); \ 10212 } \ 10213 } while (0) 10214 10215 #define SOCK_OPS_GET_SK() \ 10216 do { \ 10217 int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 1; \ 10218 if (si->dst_reg == reg || si->src_reg == reg) \ 10219 reg--; \ 10220 if (si->dst_reg == reg || si->src_reg == reg) \ 10221 reg--; \ 10222 if (si->dst_reg == si->src_reg) { \ 10223 *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, \ 10224 offsetof(struct bpf_sock_ops_kern, \ 10225 temp)); \ 10226 fullsock_reg = reg; \ 10227 jmp += 2; \ 10228 } \ 10229 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10230 struct bpf_sock_ops_kern, \ 10231 is_fullsock), \ 10232 fullsock_reg, si->src_reg, \ 10233 offsetof(struct bpf_sock_ops_kern, \ 10234 is_fullsock)); \ 10235 *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp); \ 10236 if (si->dst_reg == si->src_reg) \ 10237 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 10238 offsetof(struct bpf_sock_ops_kern, \ 10239 temp)); \ 10240 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10241 struct bpf_sock_ops_kern, sk),\ 10242 si->dst_reg, si->src_reg, \ 10243 offsetof(struct bpf_sock_ops_kern, sk));\ 10244 if (si->dst_reg == si->src_reg) { \ 10245 *insn++ = BPF_JMP_A(1); \ 10246 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 10247 offsetof(struct bpf_sock_ops_kern, \ 10248 temp)); \ 10249 } \ 10250 } while (0) 10251 10252 #define SOCK_OPS_GET_TCP_SOCK_FIELD(FIELD) \ 10253 SOCK_OPS_GET_FIELD(FIELD, FIELD, struct tcp_sock) 10254 10255 /* Helper macro for adding write access to tcp_sock or sock fields. 10256 * The macro is called with two registers, dst_reg which contains a pointer 10257 * to ctx (context) and src_reg which contains the value that should be 10258 * stored. However, we need an additional register since we cannot overwrite 10259 * dst_reg because it may be used later in the program. 10260 * Instead we "borrow" one of the other register. We first save its value 10261 * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore 10262 * it at the end of the macro. 10263 */ 10264 #define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ 10265 do { \ 10266 int reg = BPF_REG_9; \ 10267 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \ 10268 sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \ 10269 if (si->dst_reg == reg || si->src_reg == reg) \ 10270 reg--; \ 10271 if (si->dst_reg == reg || si->src_reg == reg) \ 10272 reg--; \ 10273 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg, \ 10274 offsetof(struct bpf_sock_ops_kern, \ 10275 temp)); \ 10276 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10277 struct bpf_sock_ops_kern, \ 10278 is_fullsock), \ 10279 reg, si->dst_reg, \ 10280 offsetof(struct bpf_sock_ops_kern, \ 10281 is_fullsock)); \ 10282 *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2); \ 10283 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10284 struct bpf_sock_ops_kern, sk),\ 10285 reg, si->dst_reg, \ 10286 offsetof(struct bpf_sock_ops_kern, sk));\ 10287 *insn++ = BPF_RAW_INSN(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD) | \ 10288 BPF_MEM | BPF_CLASS(si->code), \ 10289 reg, si->src_reg, \ 10290 offsetof(OBJ, OBJ_FIELD), \ 10291 si->imm); \ 10292 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg, \ 10293 offsetof(struct bpf_sock_ops_kern, \ 10294 temp)); \ 10295 } while (0) 10296 10297 #define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE) \ 10298 do { \ 10299 if (TYPE == BPF_WRITE) \ 10300 SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ 10301 else \ 10302 SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ 10303 } while (0) 10304 10305 switch (si->off) { 10306 case offsetof(struct bpf_sock_ops, op): 10307 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10308 op), 10309 si->dst_reg, si->src_reg, 10310 offsetof(struct bpf_sock_ops_kern, op)); 10311 break; 10312 10313 case offsetof(struct bpf_sock_ops, replylong[0]) ... 10314 offsetof(struct bpf_sock_ops, replylong[3]): 10315 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, reply) != 10316 sizeof_field(struct bpf_sock_ops_kern, reply)); 10317 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, replylong) != 10318 sizeof_field(struct bpf_sock_ops_kern, replylong)); 10319 off = si->off; 10320 off -= offsetof(struct bpf_sock_ops, replylong[0]); 10321 off += offsetof(struct bpf_sock_ops_kern, replylong[0]); 10322 if (type == BPF_WRITE) 10323 *insn++ = BPF_EMIT_STORE(BPF_W, si, off); 10324 else 10325 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 10326 off); 10327 break; 10328 10329 case offsetof(struct bpf_sock_ops, family): 10330 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); 10331 10332 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10333 struct bpf_sock_ops_kern, sk), 10334 si->dst_reg, si->src_reg, 10335 offsetof(struct bpf_sock_ops_kern, sk)); 10336 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10337 offsetof(struct sock_common, skc_family)); 10338 break; 10339 10340 case offsetof(struct bpf_sock_ops, remote_ip4): 10341 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); 10342 10343 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10344 struct bpf_sock_ops_kern, sk), 10345 si->dst_reg, si->src_reg, 10346 offsetof(struct bpf_sock_ops_kern, sk)); 10347 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10348 offsetof(struct sock_common, skc_daddr)); 10349 break; 10350 10351 case offsetof(struct bpf_sock_ops, local_ip4): 10352 BUILD_BUG_ON(sizeof_field(struct sock_common, 10353 skc_rcv_saddr) != 4); 10354 10355 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10356 struct bpf_sock_ops_kern, sk), 10357 si->dst_reg, si->src_reg, 10358 offsetof(struct bpf_sock_ops_kern, sk)); 10359 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10360 offsetof(struct sock_common, 10361 skc_rcv_saddr)); 10362 break; 10363 10364 case offsetof(struct bpf_sock_ops, remote_ip6[0]) ... 10365 offsetof(struct bpf_sock_ops, remote_ip6[3]): 10366 #if IS_ENABLED(CONFIG_IPV6) 10367 BUILD_BUG_ON(sizeof_field(struct sock_common, 10368 skc_v6_daddr.s6_addr32[0]) != 4); 10369 10370 off = si->off; 10371 off -= offsetof(struct bpf_sock_ops, remote_ip6[0]); 10372 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10373 struct bpf_sock_ops_kern, sk), 10374 si->dst_reg, si->src_reg, 10375 offsetof(struct bpf_sock_ops_kern, sk)); 10376 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10377 offsetof(struct sock_common, 10378 skc_v6_daddr.s6_addr32[0]) + 10379 off); 10380 #else 10381 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 10382 #endif 10383 break; 10384 10385 case offsetof(struct bpf_sock_ops, local_ip6[0]) ... 10386 offsetof(struct bpf_sock_ops, local_ip6[3]): 10387 #if IS_ENABLED(CONFIG_IPV6) 10388 BUILD_BUG_ON(sizeof_field(struct sock_common, 10389 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 10390 10391 off = si->off; 10392 off -= offsetof(struct bpf_sock_ops, local_ip6[0]); 10393 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10394 struct bpf_sock_ops_kern, sk), 10395 si->dst_reg, si->src_reg, 10396 offsetof(struct bpf_sock_ops_kern, sk)); 10397 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10398 offsetof(struct sock_common, 10399 skc_v6_rcv_saddr.s6_addr32[0]) + 10400 off); 10401 #else 10402 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 10403 #endif 10404 break; 10405 10406 case offsetof(struct bpf_sock_ops, remote_port): 10407 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); 10408 10409 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10410 struct bpf_sock_ops_kern, sk), 10411 si->dst_reg, si->src_reg, 10412 offsetof(struct bpf_sock_ops_kern, sk)); 10413 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10414 offsetof(struct sock_common, skc_dport)); 10415 #ifndef __BIG_ENDIAN_BITFIELD 10416 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 10417 #endif 10418 break; 10419 10420 case offsetof(struct bpf_sock_ops, local_port): 10421 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); 10422 10423 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10424 struct bpf_sock_ops_kern, sk), 10425 si->dst_reg, si->src_reg, 10426 offsetof(struct bpf_sock_ops_kern, sk)); 10427 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10428 offsetof(struct sock_common, skc_num)); 10429 break; 10430 10431 case offsetof(struct bpf_sock_ops, is_fullsock): 10432 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10433 struct bpf_sock_ops_kern, 10434 is_fullsock), 10435 si->dst_reg, si->src_reg, 10436 offsetof(struct bpf_sock_ops_kern, 10437 is_fullsock)); 10438 break; 10439 10440 case offsetof(struct bpf_sock_ops, state): 10441 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_state) != 1); 10442 10443 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10444 struct bpf_sock_ops_kern, sk), 10445 si->dst_reg, si->src_reg, 10446 offsetof(struct bpf_sock_ops_kern, sk)); 10447 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg, 10448 offsetof(struct sock_common, skc_state)); 10449 break; 10450 10451 case offsetof(struct bpf_sock_ops, rtt_min): 10452 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) != 10453 sizeof(struct minmax)); 10454 BUILD_BUG_ON(sizeof(struct minmax) < 10455 sizeof(struct minmax_sample)); 10456 10457 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10458 struct bpf_sock_ops_kern, sk), 10459 si->dst_reg, si->src_reg, 10460 offsetof(struct bpf_sock_ops_kern, sk)); 10461 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10462 offsetof(struct tcp_sock, rtt_min) + 10463 sizeof_field(struct minmax_sample, t)); 10464 break; 10465 10466 case offsetof(struct bpf_sock_ops, bpf_sock_ops_cb_flags): 10467 SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags, 10468 struct tcp_sock); 10469 break; 10470 10471 case offsetof(struct bpf_sock_ops, sk_txhash): 10472 SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash, 10473 struct sock, type); 10474 break; 10475 case offsetof(struct bpf_sock_ops, snd_cwnd): 10476 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_cwnd); 10477 break; 10478 case offsetof(struct bpf_sock_ops, srtt_us): 10479 SOCK_OPS_GET_TCP_SOCK_FIELD(srtt_us); 10480 break; 10481 case offsetof(struct bpf_sock_ops, snd_ssthresh): 10482 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_ssthresh); 10483 break; 10484 case offsetof(struct bpf_sock_ops, rcv_nxt): 10485 SOCK_OPS_GET_TCP_SOCK_FIELD(rcv_nxt); 10486 break; 10487 case offsetof(struct bpf_sock_ops, snd_nxt): 10488 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_nxt); 10489 break; 10490 case offsetof(struct bpf_sock_ops, snd_una): 10491 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_una); 10492 break; 10493 case offsetof(struct bpf_sock_ops, mss_cache): 10494 SOCK_OPS_GET_TCP_SOCK_FIELD(mss_cache); 10495 break; 10496 case offsetof(struct bpf_sock_ops, ecn_flags): 10497 SOCK_OPS_GET_TCP_SOCK_FIELD(ecn_flags); 10498 break; 10499 case offsetof(struct bpf_sock_ops, rate_delivered): 10500 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_delivered); 10501 break; 10502 case offsetof(struct bpf_sock_ops, rate_interval_us): 10503 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_interval_us); 10504 break; 10505 case offsetof(struct bpf_sock_ops, packets_out): 10506 SOCK_OPS_GET_TCP_SOCK_FIELD(packets_out); 10507 break; 10508 case offsetof(struct bpf_sock_ops, retrans_out): 10509 SOCK_OPS_GET_TCP_SOCK_FIELD(retrans_out); 10510 break; 10511 case offsetof(struct bpf_sock_ops, total_retrans): 10512 SOCK_OPS_GET_TCP_SOCK_FIELD(total_retrans); 10513 break; 10514 case offsetof(struct bpf_sock_ops, segs_in): 10515 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_in); 10516 break; 10517 case offsetof(struct bpf_sock_ops, data_segs_in): 10518 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_in); 10519 break; 10520 case offsetof(struct bpf_sock_ops, segs_out): 10521 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_out); 10522 break; 10523 case offsetof(struct bpf_sock_ops, data_segs_out): 10524 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_out); 10525 break; 10526 case offsetof(struct bpf_sock_ops, lost_out): 10527 SOCK_OPS_GET_TCP_SOCK_FIELD(lost_out); 10528 break; 10529 case offsetof(struct bpf_sock_ops, sacked_out): 10530 SOCK_OPS_GET_TCP_SOCK_FIELD(sacked_out); 10531 break; 10532 case offsetof(struct bpf_sock_ops, bytes_received): 10533 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_received); 10534 break; 10535 case offsetof(struct bpf_sock_ops, bytes_acked): 10536 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_acked); 10537 break; 10538 case offsetof(struct bpf_sock_ops, sk): 10539 SOCK_OPS_GET_SK(); 10540 break; 10541 case offsetof(struct bpf_sock_ops, skb_data_end): 10542 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10543 skb_data_end), 10544 si->dst_reg, si->src_reg, 10545 offsetof(struct bpf_sock_ops_kern, 10546 skb_data_end)); 10547 break; 10548 case offsetof(struct bpf_sock_ops, skb_data): 10549 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10550 skb), 10551 si->dst_reg, si->src_reg, 10552 offsetof(struct bpf_sock_ops_kern, 10553 skb)); 10554 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 10555 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 10556 si->dst_reg, si->dst_reg, 10557 offsetof(struct sk_buff, data)); 10558 break; 10559 case offsetof(struct bpf_sock_ops, skb_len): 10560 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10561 skb), 10562 si->dst_reg, si->src_reg, 10563 offsetof(struct bpf_sock_ops_kern, 10564 skb)); 10565 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 10566 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, len), 10567 si->dst_reg, si->dst_reg, 10568 offsetof(struct sk_buff, len)); 10569 break; 10570 case offsetof(struct bpf_sock_ops, skb_tcp_flags): 10571 off = offsetof(struct sk_buff, cb); 10572 off += offsetof(struct tcp_skb_cb, tcp_flags); 10573 *target_size = sizeof_field(struct tcp_skb_cb, tcp_flags); 10574 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10575 skb), 10576 si->dst_reg, si->src_reg, 10577 offsetof(struct bpf_sock_ops_kern, 10578 skb)); 10579 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 10580 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_skb_cb, 10581 tcp_flags), 10582 si->dst_reg, si->dst_reg, off); 10583 break; 10584 case offsetof(struct bpf_sock_ops, skb_hwtstamp): { 10585 struct bpf_insn *jmp_on_null_skb; 10586 10587 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10588 skb), 10589 si->dst_reg, si->src_reg, 10590 offsetof(struct bpf_sock_ops_kern, 10591 skb)); 10592 /* Reserve one insn to test skb == NULL */ 10593 jmp_on_null_skb = insn++; 10594 insn = bpf_convert_shinfo_access(si->dst_reg, si->dst_reg, insn); 10595 *insn++ = BPF_LDX_MEM(BPF_DW, si->dst_reg, si->dst_reg, 10596 bpf_target_off(struct skb_shared_info, 10597 hwtstamps, 8, 10598 target_size)); 10599 *jmp_on_null_skb = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 10600 insn - jmp_on_null_skb - 1); 10601 break; 10602 } 10603 } 10604 return insn - insn_buf; 10605 } 10606 10607 /* data_end = skb->data + skb_headlen() */ 10608 static struct bpf_insn *bpf_convert_data_end_access(const struct bpf_insn *si, 10609 struct bpf_insn *insn) 10610 { 10611 int reg; 10612 int temp_reg_off = offsetof(struct sk_buff, cb) + 10613 offsetof(struct sk_skb_cb, temp_reg); 10614 10615 if (si->src_reg == si->dst_reg) { 10616 /* We need an extra register, choose and save a register. */ 10617 reg = BPF_REG_9; 10618 if (si->src_reg == reg || si->dst_reg == reg) 10619 reg--; 10620 if (si->src_reg == reg || si->dst_reg == reg) 10621 reg--; 10622 *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, temp_reg_off); 10623 } else { 10624 reg = si->dst_reg; 10625 } 10626 10627 /* reg = skb->data */ 10628 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 10629 reg, si->src_reg, 10630 offsetof(struct sk_buff, data)); 10631 /* AX = skb->len */ 10632 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, len), 10633 BPF_REG_AX, si->src_reg, 10634 offsetof(struct sk_buff, len)); 10635 /* reg = skb->data + skb->len */ 10636 *insn++ = BPF_ALU64_REG(BPF_ADD, reg, BPF_REG_AX); 10637 /* AX = skb->data_len */ 10638 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data_len), 10639 BPF_REG_AX, si->src_reg, 10640 offsetof(struct sk_buff, data_len)); 10641 10642 /* reg = skb->data + skb->len - skb->data_len */ 10643 *insn++ = BPF_ALU64_REG(BPF_SUB, reg, BPF_REG_AX); 10644 10645 if (si->src_reg == si->dst_reg) { 10646 /* Restore the saved register */ 10647 *insn++ = BPF_MOV64_REG(BPF_REG_AX, si->src_reg); 10648 *insn++ = BPF_MOV64_REG(si->dst_reg, reg); 10649 *insn++ = BPF_LDX_MEM(BPF_DW, reg, BPF_REG_AX, temp_reg_off); 10650 } 10651 10652 return insn; 10653 } 10654 10655 static u32 sk_skb_convert_ctx_access(enum bpf_access_type type, 10656 const struct bpf_insn *si, 10657 struct bpf_insn *insn_buf, 10658 struct bpf_prog *prog, u32 *target_size) 10659 { 10660 struct bpf_insn *insn = insn_buf; 10661 int off; 10662 10663 switch (si->off) { 10664 case offsetof(struct __sk_buff, data_end): 10665 insn = bpf_convert_data_end_access(si, insn); 10666 break; 10667 case offsetof(struct __sk_buff, cb[0]) ... 10668 offsetofend(struct __sk_buff, cb[4]) - 1: 10669 BUILD_BUG_ON(sizeof_field(struct sk_skb_cb, data) < 20); 10670 BUILD_BUG_ON((offsetof(struct sk_buff, cb) + 10671 offsetof(struct sk_skb_cb, data)) % 10672 sizeof(__u64)); 10673 10674 prog->cb_access = 1; 10675 off = si->off; 10676 off -= offsetof(struct __sk_buff, cb[0]); 10677 off += offsetof(struct sk_buff, cb); 10678 off += offsetof(struct sk_skb_cb, data); 10679 if (type == BPF_WRITE) 10680 *insn++ = BPF_EMIT_STORE(BPF_SIZE(si->code), si, off); 10681 else 10682 *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg, 10683 si->src_reg, off); 10684 break; 10685 10686 10687 default: 10688 return bpf_convert_ctx_access(type, si, insn_buf, prog, 10689 target_size); 10690 } 10691 10692 return insn - insn_buf; 10693 } 10694 10695 static u32 sk_msg_convert_ctx_access(enum bpf_access_type type, 10696 const struct bpf_insn *si, 10697 struct bpf_insn *insn_buf, 10698 struct bpf_prog *prog, u32 *target_size) 10699 { 10700 struct bpf_insn *insn = insn_buf; 10701 #if IS_ENABLED(CONFIG_IPV6) 10702 int off; 10703 #endif 10704 10705 /* convert ctx uses the fact sg element is first in struct */ 10706 BUILD_BUG_ON(offsetof(struct sk_msg, sg) != 0); 10707 10708 switch (si->off) { 10709 case offsetof(struct sk_msg_md, data): 10710 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data), 10711 si->dst_reg, si->src_reg, 10712 offsetof(struct sk_msg, data)); 10713 break; 10714 case offsetof(struct sk_msg_md, data_end): 10715 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data_end), 10716 si->dst_reg, si->src_reg, 10717 offsetof(struct sk_msg, data_end)); 10718 break; 10719 case offsetof(struct sk_msg_md, family): 10720 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); 10721 10722 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10723 struct sk_msg, sk), 10724 si->dst_reg, si->src_reg, 10725 offsetof(struct sk_msg, sk)); 10726 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10727 offsetof(struct sock_common, skc_family)); 10728 break; 10729 10730 case offsetof(struct sk_msg_md, remote_ip4): 10731 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); 10732 10733 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10734 struct sk_msg, sk), 10735 si->dst_reg, si->src_reg, 10736 offsetof(struct sk_msg, sk)); 10737 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10738 offsetof(struct sock_common, skc_daddr)); 10739 break; 10740 10741 case offsetof(struct sk_msg_md, local_ip4): 10742 BUILD_BUG_ON(sizeof_field(struct sock_common, 10743 skc_rcv_saddr) != 4); 10744 10745 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10746 struct sk_msg, sk), 10747 si->dst_reg, si->src_reg, 10748 offsetof(struct sk_msg, sk)); 10749 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10750 offsetof(struct sock_common, 10751 skc_rcv_saddr)); 10752 break; 10753 10754 case offsetof(struct sk_msg_md, remote_ip6[0]) ... 10755 offsetof(struct sk_msg_md, remote_ip6[3]): 10756 #if IS_ENABLED(CONFIG_IPV6) 10757 BUILD_BUG_ON(sizeof_field(struct sock_common, 10758 skc_v6_daddr.s6_addr32[0]) != 4); 10759 10760 off = si->off; 10761 off -= offsetof(struct sk_msg_md, remote_ip6[0]); 10762 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10763 struct sk_msg, sk), 10764 si->dst_reg, si->src_reg, 10765 offsetof(struct sk_msg, sk)); 10766 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10767 offsetof(struct sock_common, 10768 skc_v6_daddr.s6_addr32[0]) + 10769 off); 10770 #else 10771 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 10772 #endif 10773 break; 10774 10775 case offsetof(struct sk_msg_md, local_ip6[0]) ... 10776 offsetof(struct sk_msg_md, local_ip6[3]): 10777 #if IS_ENABLED(CONFIG_IPV6) 10778 BUILD_BUG_ON(sizeof_field(struct sock_common, 10779 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 10780 10781 off = si->off; 10782 off -= offsetof(struct sk_msg_md, local_ip6[0]); 10783 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10784 struct sk_msg, sk), 10785 si->dst_reg, si->src_reg, 10786 offsetof(struct sk_msg, sk)); 10787 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10788 offsetof(struct sock_common, 10789 skc_v6_rcv_saddr.s6_addr32[0]) + 10790 off); 10791 #else 10792 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 10793 #endif 10794 break; 10795 10796 case offsetof(struct sk_msg_md, remote_port): 10797 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); 10798 10799 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10800 struct sk_msg, sk), 10801 si->dst_reg, si->src_reg, 10802 offsetof(struct sk_msg, sk)); 10803 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10804 offsetof(struct sock_common, skc_dport)); 10805 #ifndef __BIG_ENDIAN_BITFIELD 10806 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 10807 #endif 10808 break; 10809 10810 case offsetof(struct sk_msg_md, local_port): 10811 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); 10812 10813 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10814 struct sk_msg, sk), 10815 si->dst_reg, si->src_reg, 10816 offsetof(struct sk_msg, sk)); 10817 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10818 offsetof(struct sock_common, skc_num)); 10819 break; 10820 10821 case offsetof(struct sk_msg_md, size): 10822 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_sg, size), 10823 si->dst_reg, si->src_reg, 10824 offsetof(struct sk_msg_sg, size)); 10825 break; 10826 10827 case offsetof(struct sk_msg_md, sk): 10828 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, sk), 10829 si->dst_reg, si->src_reg, 10830 offsetof(struct sk_msg, sk)); 10831 break; 10832 } 10833 10834 return insn - insn_buf; 10835 } 10836 10837 const struct bpf_verifier_ops sk_filter_verifier_ops = { 10838 .get_func_proto = sk_filter_func_proto, 10839 .is_valid_access = sk_filter_is_valid_access, 10840 .convert_ctx_access = bpf_convert_ctx_access, 10841 .gen_ld_abs = bpf_gen_ld_abs, 10842 }; 10843 10844 const struct bpf_prog_ops sk_filter_prog_ops = { 10845 .test_run = bpf_prog_test_run_skb, 10846 }; 10847 10848 const struct bpf_verifier_ops tc_cls_act_verifier_ops = { 10849 .get_func_proto = tc_cls_act_func_proto, 10850 .is_valid_access = tc_cls_act_is_valid_access, 10851 .convert_ctx_access = tc_cls_act_convert_ctx_access, 10852 .gen_prologue = tc_cls_act_prologue, 10853 .gen_ld_abs = bpf_gen_ld_abs, 10854 .btf_struct_access = tc_cls_act_btf_struct_access, 10855 }; 10856 10857 const struct bpf_prog_ops tc_cls_act_prog_ops = { 10858 .test_run = bpf_prog_test_run_skb, 10859 }; 10860 10861 const struct bpf_verifier_ops xdp_verifier_ops = { 10862 .get_func_proto = xdp_func_proto, 10863 .is_valid_access = xdp_is_valid_access, 10864 .convert_ctx_access = xdp_convert_ctx_access, 10865 .gen_prologue = bpf_noop_prologue, 10866 .btf_struct_access = xdp_btf_struct_access, 10867 }; 10868 10869 const struct bpf_prog_ops xdp_prog_ops = { 10870 .test_run = bpf_prog_test_run_xdp, 10871 }; 10872 10873 const struct bpf_verifier_ops cg_skb_verifier_ops = { 10874 .get_func_proto = cg_skb_func_proto, 10875 .is_valid_access = cg_skb_is_valid_access, 10876 .convert_ctx_access = bpf_convert_ctx_access, 10877 }; 10878 10879 const struct bpf_prog_ops cg_skb_prog_ops = { 10880 .test_run = bpf_prog_test_run_skb, 10881 }; 10882 10883 const struct bpf_verifier_ops lwt_in_verifier_ops = { 10884 .get_func_proto = lwt_in_func_proto, 10885 .is_valid_access = lwt_is_valid_access, 10886 .convert_ctx_access = bpf_convert_ctx_access, 10887 }; 10888 10889 const struct bpf_prog_ops lwt_in_prog_ops = { 10890 .test_run = bpf_prog_test_run_skb, 10891 }; 10892 10893 const struct bpf_verifier_ops lwt_out_verifier_ops = { 10894 .get_func_proto = lwt_out_func_proto, 10895 .is_valid_access = lwt_is_valid_access, 10896 .convert_ctx_access = bpf_convert_ctx_access, 10897 }; 10898 10899 const struct bpf_prog_ops lwt_out_prog_ops = { 10900 .test_run = bpf_prog_test_run_skb, 10901 }; 10902 10903 const struct bpf_verifier_ops lwt_xmit_verifier_ops = { 10904 .get_func_proto = lwt_xmit_func_proto, 10905 .is_valid_access = lwt_is_valid_access, 10906 .convert_ctx_access = bpf_convert_ctx_access, 10907 .gen_prologue = tc_cls_act_prologue, 10908 }; 10909 10910 const struct bpf_prog_ops lwt_xmit_prog_ops = { 10911 .test_run = bpf_prog_test_run_skb, 10912 }; 10913 10914 const struct bpf_verifier_ops lwt_seg6local_verifier_ops = { 10915 .get_func_proto = lwt_seg6local_func_proto, 10916 .is_valid_access = lwt_is_valid_access, 10917 .convert_ctx_access = bpf_convert_ctx_access, 10918 }; 10919 10920 const struct bpf_prog_ops lwt_seg6local_prog_ops = { 10921 .test_run = bpf_prog_test_run_skb, 10922 }; 10923 10924 const struct bpf_verifier_ops cg_sock_verifier_ops = { 10925 .get_func_proto = sock_filter_func_proto, 10926 .is_valid_access = sock_filter_is_valid_access, 10927 .convert_ctx_access = bpf_sock_convert_ctx_access, 10928 }; 10929 10930 const struct bpf_prog_ops cg_sock_prog_ops = { 10931 }; 10932 10933 const struct bpf_verifier_ops cg_sock_addr_verifier_ops = { 10934 .get_func_proto = sock_addr_func_proto, 10935 .is_valid_access = sock_addr_is_valid_access, 10936 .convert_ctx_access = sock_addr_convert_ctx_access, 10937 }; 10938 10939 const struct bpf_prog_ops cg_sock_addr_prog_ops = { 10940 }; 10941 10942 const struct bpf_verifier_ops sock_ops_verifier_ops = { 10943 .get_func_proto = sock_ops_func_proto, 10944 .is_valid_access = sock_ops_is_valid_access, 10945 .convert_ctx_access = sock_ops_convert_ctx_access, 10946 }; 10947 10948 const struct bpf_prog_ops sock_ops_prog_ops = { 10949 }; 10950 10951 const struct bpf_verifier_ops sk_skb_verifier_ops = { 10952 .get_func_proto = sk_skb_func_proto, 10953 .is_valid_access = sk_skb_is_valid_access, 10954 .convert_ctx_access = sk_skb_convert_ctx_access, 10955 .gen_prologue = sk_skb_prologue, 10956 }; 10957 10958 const struct bpf_prog_ops sk_skb_prog_ops = { 10959 }; 10960 10961 const struct bpf_verifier_ops sk_msg_verifier_ops = { 10962 .get_func_proto = sk_msg_func_proto, 10963 .is_valid_access = sk_msg_is_valid_access, 10964 .convert_ctx_access = sk_msg_convert_ctx_access, 10965 .gen_prologue = bpf_noop_prologue, 10966 }; 10967 10968 const struct bpf_prog_ops sk_msg_prog_ops = { 10969 }; 10970 10971 const struct bpf_verifier_ops flow_dissector_verifier_ops = { 10972 .get_func_proto = flow_dissector_func_proto, 10973 .is_valid_access = flow_dissector_is_valid_access, 10974 .convert_ctx_access = flow_dissector_convert_ctx_access, 10975 }; 10976 10977 const struct bpf_prog_ops flow_dissector_prog_ops = { 10978 .test_run = bpf_prog_test_run_flow_dissector, 10979 }; 10980 10981 int sk_detach_filter(struct sock *sk) 10982 { 10983 int ret = -ENOENT; 10984 struct sk_filter *filter; 10985 10986 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 10987 return -EPERM; 10988 10989 filter = rcu_dereference_protected(sk->sk_filter, 10990 lockdep_sock_is_held(sk)); 10991 if (filter) { 10992 RCU_INIT_POINTER(sk->sk_filter, NULL); 10993 sk_filter_uncharge(sk, filter); 10994 ret = 0; 10995 } 10996 10997 return ret; 10998 } 10999 EXPORT_SYMBOL_GPL(sk_detach_filter); 11000 11001 int sk_get_filter(struct sock *sk, sockptr_t optval, unsigned int len) 11002 { 11003 struct sock_fprog_kern *fprog; 11004 struct sk_filter *filter; 11005 int ret = 0; 11006 11007 sockopt_lock_sock(sk); 11008 filter = rcu_dereference_protected(sk->sk_filter, 11009 lockdep_sock_is_held(sk)); 11010 if (!filter) 11011 goto out; 11012 11013 /* We're copying the filter that has been originally attached, 11014 * so no conversion/decode needed anymore. eBPF programs that 11015 * have no original program cannot be dumped through this. 11016 */ 11017 ret = -EACCES; 11018 fprog = filter->prog->orig_prog; 11019 if (!fprog) 11020 goto out; 11021 11022 ret = fprog->len; 11023 if (!len) 11024 /* User space only enquires number of filter blocks. */ 11025 goto out; 11026 11027 ret = -EINVAL; 11028 if (len < fprog->len) 11029 goto out; 11030 11031 ret = -EFAULT; 11032 if (copy_to_sockptr(optval, fprog->filter, bpf_classic_proglen(fprog))) 11033 goto out; 11034 11035 /* Instead of bytes, the API requests to return the number 11036 * of filter blocks. 11037 */ 11038 ret = fprog->len; 11039 out: 11040 sockopt_release_sock(sk); 11041 return ret; 11042 } 11043 11044 #ifdef CONFIG_INET 11045 static void bpf_init_reuseport_kern(struct sk_reuseport_kern *reuse_kern, 11046 struct sock_reuseport *reuse, 11047 struct sock *sk, struct sk_buff *skb, 11048 struct sock *migrating_sk, 11049 u32 hash) 11050 { 11051 reuse_kern->skb = skb; 11052 reuse_kern->sk = sk; 11053 reuse_kern->selected_sk = NULL; 11054 reuse_kern->migrating_sk = migrating_sk; 11055 reuse_kern->data_end = skb->data + skb_headlen(skb); 11056 reuse_kern->hash = hash; 11057 reuse_kern->reuseport_id = reuse->reuseport_id; 11058 reuse_kern->bind_inany = reuse->bind_inany; 11059 } 11060 11061 struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk, 11062 struct bpf_prog *prog, struct sk_buff *skb, 11063 struct sock *migrating_sk, 11064 u32 hash) 11065 { 11066 struct sk_reuseport_kern reuse_kern; 11067 enum sk_action action; 11068 11069 bpf_init_reuseport_kern(&reuse_kern, reuse, sk, skb, migrating_sk, hash); 11070 action = bpf_prog_run(prog, &reuse_kern); 11071 11072 if (action == SK_PASS) 11073 return reuse_kern.selected_sk; 11074 else 11075 return ERR_PTR(-ECONNREFUSED); 11076 } 11077 11078 BPF_CALL_4(sk_select_reuseport, struct sk_reuseport_kern *, reuse_kern, 11079 struct bpf_map *, map, void *, key, u32, flags) 11080 { 11081 bool is_sockarray = map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY; 11082 struct sock_reuseport *reuse; 11083 struct sock *selected_sk; 11084 11085 selected_sk = map->ops->map_lookup_elem(map, key); 11086 if (!selected_sk) 11087 return -ENOENT; 11088 11089 reuse = rcu_dereference(selected_sk->sk_reuseport_cb); 11090 if (!reuse) { 11091 /* Lookup in sock_map can return TCP ESTABLISHED sockets. */ 11092 if (sk_is_refcounted(selected_sk)) 11093 sock_put(selected_sk); 11094 11095 /* reuseport_array has only sk with non NULL sk_reuseport_cb. 11096 * The only (!reuse) case here is - the sk has already been 11097 * unhashed (e.g. by close()), so treat it as -ENOENT. 11098 * 11099 * Other maps (e.g. sock_map) do not provide this guarantee and 11100 * the sk may never be in the reuseport group to begin with. 11101 */ 11102 return is_sockarray ? -ENOENT : -EINVAL; 11103 } 11104 11105 if (unlikely(reuse->reuseport_id != reuse_kern->reuseport_id)) { 11106 struct sock *sk = reuse_kern->sk; 11107 11108 if (sk->sk_protocol != selected_sk->sk_protocol) 11109 return -EPROTOTYPE; 11110 else if (sk->sk_family != selected_sk->sk_family) 11111 return -EAFNOSUPPORT; 11112 11113 /* Catch all. Likely bound to a different sockaddr. */ 11114 return -EBADFD; 11115 } 11116 11117 reuse_kern->selected_sk = selected_sk; 11118 11119 return 0; 11120 } 11121 11122 static const struct bpf_func_proto sk_select_reuseport_proto = { 11123 .func = sk_select_reuseport, 11124 .gpl_only = false, 11125 .ret_type = RET_INTEGER, 11126 .arg1_type = ARG_PTR_TO_CTX, 11127 .arg2_type = ARG_CONST_MAP_PTR, 11128 .arg3_type = ARG_PTR_TO_MAP_KEY, 11129 .arg4_type = ARG_ANYTHING, 11130 }; 11131 11132 BPF_CALL_4(sk_reuseport_load_bytes, 11133 const struct sk_reuseport_kern *, reuse_kern, u32, offset, 11134 void *, to, u32, len) 11135 { 11136 return ____bpf_skb_load_bytes(reuse_kern->skb, offset, to, len); 11137 } 11138 11139 static const struct bpf_func_proto sk_reuseport_load_bytes_proto = { 11140 .func = sk_reuseport_load_bytes, 11141 .gpl_only = false, 11142 .ret_type = RET_INTEGER, 11143 .arg1_type = ARG_PTR_TO_CTX, 11144 .arg2_type = ARG_ANYTHING, 11145 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 11146 .arg4_type = ARG_CONST_SIZE, 11147 }; 11148 11149 BPF_CALL_5(sk_reuseport_load_bytes_relative, 11150 const struct sk_reuseport_kern *, reuse_kern, u32, offset, 11151 void *, to, u32, len, u32, start_header) 11152 { 11153 return ____bpf_skb_load_bytes_relative(reuse_kern->skb, offset, to, 11154 len, start_header); 11155 } 11156 11157 static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto = { 11158 .func = sk_reuseport_load_bytes_relative, 11159 .gpl_only = false, 11160 .ret_type = RET_INTEGER, 11161 .arg1_type = ARG_PTR_TO_CTX, 11162 .arg2_type = ARG_ANYTHING, 11163 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 11164 .arg4_type = ARG_CONST_SIZE, 11165 .arg5_type = ARG_ANYTHING, 11166 }; 11167 11168 static const struct bpf_func_proto * 11169 sk_reuseport_func_proto(enum bpf_func_id func_id, 11170 const struct bpf_prog *prog) 11171 { 11172 switch (func_id) { 11173 case BPF_FUNC_sk_select_reuseport: 11174 return &sk_select_reuseport_proto; 11175 case BPF_FUNC_skb_load_bytes: 11176 return &sk_reuseport_load_bytes_proto; 11177 case BPF_FUNC_skb_load_bytes_relative: 11178 return &sk_reuseport_load_bytes_relative_proto; 11179 case BPF_FUNC_get_socket_cookie: 11180 return &bpf_get_socket_ptr_cookie_proto; 11181 case BPF_FUNC_ktime_get_coarse_ns: 11182 return &bpf_ktime_get_coarse_ns_proto; 11183 default: 11184 return bpf_base_func_proto(func_id); 11185 } 11186 } 11187 11188 static bool 11189 sk_reuseport_is_valid_access(int off, int size, 11190 enum bpf_access_type type, 11191 const struct bpf_prog *prog, 11192 struct bpf_insn_access_aux *info) 11193 { 11194 const u32 size_default = sizeof(__u32); 11195 11196 if (off < 0 || off >= sizeof(struct sk_reuseport_md) || 11197 off % size || type != BPF_READ) 11198 return false; 11199 11200 switch (off) { 11201 case offsetof(struct sk_reuseport_md, data): 11202 info->reg_type = PTR_TO_PACKET; 11203 return size == sizeof(__u64); 11204 11205 case offsetof(struct sk_reuseport_md, data_end): 11206 info->reg_type = PTR_TO_PACKET_END; 11207 return size == sizeof(__u64); 11208 11209 case offsetof(struct sk_reuseport_md, hash): 11210 return size == size_default; 11211 11212 case offsetof(struct sk_reuseport_md, sk): 11213 info->reg_type = PTR_TO_SOCKET; 11214 return size == sizeof(__u64); 11215 11216 case offsetof(struct sk_reuseport_md, migrating_sk): 11217 info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL; 11218 return size == sizeof(__u64); 11219 11220 /* Fields that allow narrowing */ 11221 case bpf_ctx_range(struct sk_reuseport_md, eth_protocol): 11222 if (size < sizeof_field(struct sk_buff, protocol)) 11223 return false; 11224 fallthrough; 11225 case bpf_ctx_range(struct sk_reuseport_md, ip_protocol): 11226 case bpf_ctx_range(struct sk_reuseport_md, bind_inany): 11227 case bpf_ctx_range(struct sk_reuseport_md, len): 11228 bpf_ctx_record_field_size(info, size_default); 11229 return bpf_ctx_narrow_access_ok(off, size, size_default); 11230 11231 default: 11232 return false; 11233 } 11234 } 11235 11236 #define SK_REUSEPORT_LOAD_FIELD(F) ({ \ 11237 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \ 11238 si->dst_reg, si->src_reg, \ 11239 bpf_target_off(struct sk_reuseport_kern, F, \ 11240 sizeof_field(struct sk_reuseport_kern, F), \ 11241 target_size)); \ 11242 }) 11243 11244 #define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD) \ 11245 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \ 11246 struct sk_buff, \ 11247 skb, \ 11248 SKB_FIELD) 11249 11250 #define SK_REUSEPORT_LOAD_SK_FIELD(SK_FIELD) \ 11251 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \ 11252 struct sock, \ 11253 sk, \ 11254 SK_FIELD) 11255 11256 static u32 sk_reuseport_convert_ctx_access(enum bpf_access_type type, 11257 const struct bpf_insn *si, 11258 struct bpf_insn *insn_buf, 11259 struct bpf_prog *prog, 11260 u32 *target_size) 11261 { 11262 struct bpf_insn *insn = insn_buf; 11263 11264 switch (si->off) { 11265 case offsetof(struct sk_reuseport_md, data): 11266 SK_REUSEPORT_LOAD_SKB_FIELD(data); 11267 break; 11268 11269 case offsetof(struct sk_reuseport_md, len): 11270 SK_REUSEPORT_LOAD_SKB_FIELD(len); 11271 break; 11272 11273 case offsetof(struct sk_reuseport_md, eth_protocol): 11274 SK_REUSEPORT_LOAD_SKB_FIELD(protocol); 11275 break; 11276 11277 case offsetof(struct sk_reuseport_md, ip_protocol): 11278 SK_REUSEPORT_LOAD_SK_FIELD(sk_protocol); 11279 break; 11280 11281 case offsetof(struct sk_reuseport_md, data_end): 11282 SK_REUSEPORT_LOAD_FIELD(data_end); 11283 break; 11284 11285 case offsetof(struct sk_reuseport_md, hash): 11286 SK_REUSEPORT_LOAD_FIELD(hash); 11287 break; 11288 11289 case offsetof(struct sk_reuseport_md, bind_inany): 11290 SK_REUSEPORT_LOAD_FIELD(bind_inany); 11291 break; 11292 11293 case offsetof(struct sk_reuseport_md, sk): 11294 SK_REUSEPORT_LOAD_FIELD(sk); 11295 break; 11296 11297 case offsetof(struct sk_reuseport_md, migrating_sk): 11298 SK_REUSEPORT_LOAD_FIELD(migrating_sk); 11299 break; 11300 } 11301 11302 return insn - insn_buf; 11303 } 11304 11305 const struct bpf_verifier_ops sk_reuseport_verifier_ops = { 11306 .get_func_proto = sk_reuseport_func_proto, 11307 .is_valid_access = sk_reuseport_is_valid_access, 11308 .convert_ctx_access = sk_reuseport_convert_ctx_access, 11309 }; 11310 11311 const struct bpf_prog_ops sk_reuseport_prog_ops = { 11312 }; 11313 11314 DEFINE_STATIC_KEY_FALSE(bpf_sk_lookup_enabled); 11315 EXPORT_SYMBOL(bpf_sk_lookup_enabled); 11316 11317 BPF_CALL_3(bpf_sk_lookup_assign, struct bpf_sk_lookup_kern *, ctx, 11318 struct sock *, sk, u64, flags) 11319 { 11320 if (unlikely(flags & ~(BPF_SK_LOOKUP_F_REPLACE | 11321 BPF_SK_LOOKUP_F_NO_REUSEPORT))) 11322 return -EINVAL; 11323 if (unlikely(sk && sk_is_refcounted(sk))) 11324 return -ESOCKTNOSUPPORT; /* reject non-RCU freed sockets */ 11325 if (unlikely(sk && sk_is_tcp(sk) && sk->sk_state != TCP_LISTEN)) 11326 return -ESOCKTNOSUPPORT; /* only accept TCP socket in LISTEN */ 11327 if (unlikely(sk && sk_is_udp(sk) && sk->sk_state != TCP_CLOSE)) 11328 return -ESOCKTNOSUPPORT; /* only accept UDP socket in CLOSE */ 11329 11330 /* Check if socket is suitable for packet L3/L4 protocol */ 11331 if (sk && sk->sk_protocol != ctx->protocol) 11332 return -EPROTOTYPE; 11333 if (sk && sk->sk_family != ctx->family && 11334 (sk->sk_family == AF_INET || ipv6_only_sock(sk))) 11335 return -EAFNOSUPPORT; 11336 11337 if (ctx->selected_sk && !(flags & BPF_SK_LOOKUP_F_REPLACE)) 11338 return -EEXIST; 11339 11340 /* Select socket as lookup result */ 11341 ctx->selected_sk = sk; 11342 ctx->no_reuseport = flags & BPF_SK_LOOKUP_F_NO_REUSEPORT; 11343 return 0; 11344 } 11345 11346 static const struct bpf_func_proto bpf_sk_lookup_assign_proto = { 11347 .func = bpf_sk_lookup_assign, 11348 .gpl_only = false, 11349 .ret_type = RET_INTEGER, 11350 .arg1_type = ARG_PTR_TO_CTX, 11351 .arg2_type = ARG_PTR_TO_SOCKET_OR_NULL, 11352 .arg3_type = ARG_ANYTHING, 11353 }; 11354 11355 static const struct bpf_func_proto * 11356 sk_lookup_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 11357 { 11358 switch (func_id) { 11359 case BPF_FUNC_perf_event_output: 11360 return &bpf_event_output_data_proto; 11361 case BPF_FUNC_sk_assign: 11362 return &bpf_sk_lookup_assign_proto; 11363 case BPF_FUNC_sk_release: 11364 return &bpf_sk_release_proto; 11365 default: 11366 return bpf_sk_base_func_proto(func_id); 11367 } 11368 } 11369 11370 static bool sk_lookup_is_valid_access(int off, int size, 11371 enum bpf_access_type type, 11372 const struct bpf_prog *prog, 11373 struct bpf_insn_access_aux *info) 11374 { 11375 if (off < 0 || off >= sizeof(struct bpf_sk_lookup)) 11376 return false; 11377 if (off % size != 0) 11378 return false; 11379 if (type != BPF_READ) 11380 return false; 11381 11382 switch (off) { 11383 case offsetof(struct bpf_sk_lookup, sk): 11384 info->reg_type = PTR_TO_SOCKET_OR_NULL; 11385 return size == sizeof(__u64); 11386 11387 case bpf_ctx_range(struct bpf_sk_lookup, family): 11388 case bpf_ctx_range(struct bpf_sk_lookup, protocol): 11389 case bpf_ctx_range(struct bpf_sk_lookup, remote_ip4): 11390 case bpf_ctx_range(struct bpf_sk_lookup, local_ip4): 11391 case bpf_ctx_range_till(struct bpf_sk_lookup, remote_ip6[0], remote_ip6[3]): 11392 case bpf_ctx_range_till(struct bpf_sk_lookup, local_ip6[0], local_ip6[3]): 11393 case bpf_ctx_range(struct bpf_sk_lookup, local_port): 11394 case bpf_ctx_range(struct bpf_sk_lookup, ingress_ifindex): 11395 bpf_ctx_record_field_size(info, sizeof(__u32)); 11396 return bpf_ctx_narrow_access_ok(off, size, sizeof(__u32)); 11397 11398 case bpf_ctx_range(struct bpf_sk_lookup, remote_port): 11399 /* Allow 4-byte access to 2-byte field for backward compatibility */ 11400 if (size == sizeof(__u32)) 11401 return true; 11402 bpf_ctx_record_field_size(info, sizeof(__be16)); 11403 return bpf_ctx_narrow_access_ok(off, size, sizeof(__be16)); 11404 11405 case offsetofend(struct bpf_sk_lookup, remote_port) ... 11406 offsetof(struct bpf_sk_lookup, local_ip4) - 1: 11407 /* Allow access to zero padding for backward compatibility */ 11408 bpf_ctx_record_field_size(info, sizeof(__u16)); 11409 return bpf_ctx_narrow_access_ok(off, size, sizeof(__u16)); 11410 11411 default: 11412 return false; 11413 } 11414 } 11415 11416 static u32 sk_lookup_convert_ctx_access(enum bpf_access_type type, 11417 const struct bpf_insn *si, 11418 struct bpf_insn *insn_buf, 11419 struct bpf_prog *prog, 11420 u32 *target_size) 11421 { 11422 struct bpf_insn *insn = insn_buf; 11423 11424 switch (si->off) { 11425 case offsetof(struct bpf_sk_lookup, sk): 11426 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg, 11427 offsetof(struct bpf_sk_lookup_kern, selected_sk)); 11428 break; 11429 11430 case offsetof(struct bpf_sk_lookup, family): 11431 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 11432 bpf_target_off(struct bpf_sk_lookup_kern, 11433 family, 2, target_size)); 11434 break; 11435 11436 case offsetof(struct bpf_sk_lookup, protocol): 11437 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 11438 bpf_target_off(struct bpf_sk_lookup_kern, 11439 protocol, 2, target_size)); 11440 break; 11441 11442 case offsetof(struct bpf_sk_lookup, remote_ip4): 11443 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 11444 bpf_target_off(struct bpf_sk_lookup_kern, 11445 v4.saddr, 4, target_size)); 11446 break; 11447 11448 case offsetof(struct bpf_sk_lookup, local_ip4): 11449 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 11450 bpf_target_off(struct bpf_sk_lookup_kern, 11451 v4.daddr, 4, target_size)); 11452 break; 11453 11454 case bpf_ctx_range_till(struct bpf_sk_lookup, 11455 remote_ip6[0], remote_ip6[3]): { 11456 #if IS_ENABLED(CONFIG_IPV6) 11457 int off = si->off; 11458 11459 off -= offsetof(struct bpf_sk_lookup, remote_ip6[0]); 11460 off += bpf_target_off(struct in6_addr, s6_addr32[0], 4, target_size); 11461 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg, 11462 offsetof(struct bpf_sk_lookup_kern, v6.saddr)); 11463 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 11464 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, off); 11465 #else 11466 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 11467 #endif 11468 break; 11469 } 11470 case bpf_ctx_range_till(struct bpf_sk_lookup, 11471 local_ip6[0], local_ip6[3]): { 11472 #if IS_ENABLED(CONFIG_IPV6) 11473 int off = si->off; 11474 11475 off -= offsetof(struct bpf_sk_lookup, local_ip6[0]); 11476 off += bpf_target_off(struct in6_addr, s6_addr32[0], 4, target_size); 11477 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg, 11478 offsetof(struct bpf_sk_lookup_kern, v6.daddr)); 11479 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 11480 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, off); 11481 #else 11482 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 11483 #endif 11484 break; 11485 } 11486 case offsetof(struct bpf_sk_lookup, remote_port): 11487 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 11488 bpf_target_off(struct bpf_sk_lookup_kern, 11489 sport, 2, target_size)); 11490 break; 11491 11492 case offsetofend(struct bpf_sk_lookup, remote_port): 11493 *target_size = 2; 11494 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 11495 break; 11496 11497 case offsetof(struct bpf_sk_lookup, local_port): 11498 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 11499 bpf_target_off(struct bpf_sk_lookup_kern, 11500 dport, 2, target_size)); 11501 break; 11502 11503 case offsetof(struct bpf_sk_lookup, ingress_ifindex): 11504 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 11505 bpf_target_off(struct bpf_sk_lookup_kern, 11506 ingress_ifindex, 4, target_size)); 11507 break; 11508 } 11509 11510 return insn - insn_buf; 11511 } 11512 11513 const struct bpf_prog_ops sk_lookup_prog_ops = { 11514 .test_run = bpf_prog_test_run_sk_lookup, 11515 }; 11516 11517 const struct bpf_verifier_ops sk_lookup_verifier_ops = { 11518 .get_func_proto = sk_lookup_func_proto, 11519 .is_valid_access = sk_lookup_is_valid_access, 11520 .convert_ctx_access = sk_lookup_convert_ctx_access, 11521 }; 11522 11523 #endif /* CONFIG_INET */ 11524 11525 DEFINE_BPF_DISPATCHER(xdp) 11526 11527 void bpf_prog_change_xdp(struct bpf_prog *prev_prog, struct bpf_prog *prog) 11528 { 11529 bpf_dispatcher_change_prog(BPF_DISPATCHER_PTR(xdp), prev_prog, prog); 11530 } 11531 11532 BTF_ID_LIST_GLOBAL(btf_sock_ids, MAX_BTF_SOCK_TYPE) 11533 #define BTF_SOCK_TYPE(name, type) BTF_ID(struct, type) 11534 BTF_SOCK_TYPE_xxx 11535 #undef BTF_SOCK_TYPE 11536 11537 BPF_CALL_1(bpf_skc_to_tcp6_sock, struct sock *, sk) 11538 { 11539 /* tcp6_sock type is not generated in dwarf and hence btf, 11540 * trigger an explicit type generation here. 11541 */ 11542 BTF_TYPE_EMIT(struct tcp6_sock); 11543 if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP && 11544 sk->sk_family == AF_INET6) 11545 return (unsigned long)sk; 11546 11547 return (unsigned long)NULL; 11548 } 11549 11550 const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto = { 11551 .func = bpf_skc_to_tcp6_sock, 11552 .gpl_only = false, 11553 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11554 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11555 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP6], 11556 }; 11557 11558 BPF_CALL_1(bpf_skc_to_tcp_sock, struct sock *, sk) 11559 { 11560 if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP) 11561 return (unsigned long)sk; 11562 11563 return (unsigned long)NULL; 11564 } 11565 11566 const struct bpf_func_proto bpf_skc_to_tcp_sock_proto = { 11567 .func = bpf_skc_to_tcp_sock, 11568 .gpl_only = false, 11569 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11570 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11571 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP], 11572 }; 11573 11574 BPF_CALL_1(bpf_skc_to_tcp_timewait_sock, struct sock *, sk) 11575 { 11576 /* BTF types for tcp_timewait_sock and inet_timewait_sock are not 11577 * generated if CONFIG_INET=n. Trigger an explicit generation here. 11578 */ 11579 BTF_TYPE_EMIT(struct inet_timewait_sock); 11580 BTF_TYPE_EMIT(struct tcp_timewait_sock); 11581 11582 #ifdef CONFIG_INET 11583 if (sk && sk->sk_prot == &tcp_prot && sk->sk_state == TCP_TIME_WAIT) 11584 return (unsigned long)sk; 11585 #endif 11586 11587 #if IS_BUILTIN(CONFIG_IPV6) 11588 if (sk && sk->sk_prot == &tcpv6_prot && sk->sk_state == TCP_TIME_WAIT) 11589 return (unsigned long)sk; 11590 #endif 11591 11592 return (unsigned long)NULL; 11593 } 11594 11595 const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto = { 11596 .func = bpf_skc_to_tcp_timewait_sock, 11597 .gpl_only = false, 11598 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11599 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11600 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP_TW], 11601 }; 11602 11603 BPF_CALL_1(bpf_skc_to_tcp_request_sock, struct sock *, sk) 11604 { 11605 #ifdef CONFIG_INET 11606 if (sk && sk->sk_prot == &tcp_prot && sk->sk_state == TCP_NEW_SYN_RECV) 11607 return (unsigned long)sk; 11608 #endif 11609 11610 #if IS_BUILTIN(CONFIG_IPV6) 11611 if (sk && sk->sk_prot == &tcpv6_prot && sk->sk_state == TCP_NEW_SYN_RECV) 11612 return (unsigned long)sk; 11613 #endif 11614 11615 return (unsigned long)NULL; 11616 } 11617 11618 const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto = { 11619 .func = bpf_skc_to_tcp_request_sock, 11620 .gpl_only = false, 11621 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11622 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11623 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP_REQ], 11624 }; 11625 11626 BPF_CALL_1(bpf_skc_to_udp6_sock, struct sock *, sk) 11627 { 11628 /* udp6_sock type is not generated in dwarf and hence btf, 11629 * trigger an explicit type generation here. 11630 */ 11631 BTF_TYPE_EMIT(struct udp6_sock); 11632 if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_UDP && 11633 sk->sk_type == SOCK_DGRAM && sk->sk_family == AF_INET6) 11634 return (unsigned long)sk; 11635 11636 return (unsigned long)NULL; 11637 } 11638 11639 const struct bpf_func_proto bpf_skc_to_udp6_sock_proto = { 11640 .func = bpf_skc_to_udp6_sock, 11641 .gpl_only = false, 11642 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11643 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11644 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_UDP6], 11645 }; 11646 11647 BPF_CALL_1(bpf_skc_to_unix_sock, struct sock *, sk) 11648 { 11649 /* unix_sock type is not generated in dwarf and hence btf, 11650 * trigger an explicit type generation here. 11651 */ 11652 BTF_TYPE_EMIT(struct unix_sock); 11653 if (sk && sk_fullsock(sk) && sk->sk_family == AF_UNIX) 11654 return (unsigned long)sk; 11655 11656 return (unsigned long)NULL; 11657 } 11658 11659 const struct bpf_func_proto bpf_skc_to_unix_sock_proto = { 11660 .func = bpf_skc_to_unix_sock, 11661 .gpl_only = false, 11662 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11663 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11664 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_UNIX], 11665 }; 11666 11667 BPF_CALL_1(bpf_skc_to_mptcp_sock, struct sock *, sk) 11668 { 11669 BTF_TYPE_EMIT(struct mptcp_sock); 11670 return (unsigned long)bpf_mptcp_sock_from_subflow(sk); 11671 } 11672 11673 const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto = { 11674 .func = bpf_skc_to_mptcp_sock, 11675 .gpl_only = false, 11676 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11677 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 11678 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_MPTCP], 11679 }; 11680 11681 BPF_CALL_1(bpf_sock_from_file, struct file *, file) 11682 { 11683 return (unsigned long)sock_from_file(file); 11684 } 11685 11686 BTF_ID_LIST(bpf_sock_from_file_btf_ids) 11687 BTF_ID(struct, socket) 11688 BTF_ID(struct, file) 11689 11690 const struct bpf_func_proto bpf_sock_from_file_proto = { 11691 .func = bpf_sock_from_file, 11692 .gpl_only = false, 11693 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11694 .ret_btf_id = &bpf_sock_from_file_btf_ids[0], 11695 .arg1_type = ARG_PTR_TO_BTF_ID, 11696 .arg1_btf_id = &bpf_sock_from_file_btf_ids[1], 11697 }; 11698 11699 static const struct bpf_func_proto * 11700 bpf_sk_base_func_proto(enum bpf_func_id func_id) 11701 { 11702 const struct bpf_func_proto *func; 11703 11704 switch (func_id) { 11705 case BPF_FUNC_skc_to_tcp6_sock: 11706 func = &bpf_skc_to_tcp6_sock_proto; 11707 break; 11708 case BPF_FUNC_skc_to_tcp_sock: 11709 func = &bpf_skc_to_tcp_sock_proto; 11710 break; 11711 case BPF_FUNC_skc_to_tcp_timewait_sock: 11712 func = &bpf_skc_to_tcp_timewait_sock_proto; 11713 break; 11714 case BPF_FUNC_skc_to_tcp_request_sock: 11715 func = &bpf_skc_to_tcp_request_sock_proto; 11716 break; 11717 case BPF_FUNC_skc_to_udp6_sock: 11718 func = &bpf_skc_to_udp6_sock_proto; 11719 break; 11720 case BPF_FUNC_skc_to_unix_sock: 11721 func = &bpf_skc_to_unix_sock_proto; 11722 break; 11723 case BPF_FUNC_skc_to_mptcp_sock: 11724 func = &bpf_skc_to_mptcp_sock_proto; 11725 break; 11726 case BPF_FUNC_ktime_get_coarse_ns: 11727 return &bpf_ktime_get_coarse_ns_proto; 11728 default: 11729 return bpf_base_func_proto(func_id); 11730 } 11731 11732 if (!perfmon_capable()) 11733 return NULL; 11734 11735 return func; 11736 } 11737 11738 __diag_push(); 11739 __diag_ignore_all("-Wmissing-prototypes", 11740 "Global functions as their definitions will be in vmlinux BTF"); 11741 __bpf_kfunc int bpf_dynptr_from_skb(struct sk_buff *skb, u64 flags, 11742 struct bpf_dynptr_kern *ptr__uninit) 11743 { 11744 if (flags) { 11745 bpf_dynptr_set_null(ptr__uninit); 11746 return -EINVAL; 11747 } 11748 11749 bpf_dynptr_init(ptr__uninit, skb, BPF_DYNPTR_TYPE_SKB, 0, skb->len); 11750 11751 return 0; 11752 } 11753 11754 __bpf_kfunc int bpf_dynptr_from_xdp(struct xdp_buff *xdp, u64 flags, 11755 struct bpf_dynptr_kern *ptr__uninit) 11756 { 11757 if (flags) { 11758 bpf_dynptr_set_null(ptr__uninit); 11759 return -EINVAL; 11760 } 11761 11762 bpf_dynptr_init(ptr__uninit, xdp, BPF_DYNPTR_TYPE_XDP, 0, xdp_get_buff_len(xdp)); 11763 11764 return 0; 11765 } 11766 __diag_pop(); 11767 11768 int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags, 11769 struct bpf_dynptr_kern *ptr__uninit) 11770 { 11771 int err; 11772 11773 err = bpf_dynptr_from_skb(skb, flags, ptr__uninit); 11774 if (err) 11775 return err; 11776 11777 bpf_dynptr_set_rdonly(ptr__uninit); 11778 11779 return 0; 11780 } 11781 11782 BTF_SET8_START(bpf_kfunc_check_set_skb) 11783 BTF_ID_FLAGS(func, bpf_dynptr_from_skb) 11784 BTF_SET8_END(bpf_kfunc_check_set_skb) 11785 11786 BTF_SET8_START(bpf_kfunc_check_set_xdp) 11787 BTF_ID_FLAGS(func, bpf_dynptr_from_xdp) 11788 BTF_SET8_END(bpf_kfunc_check_set_xdp) 11789 11790 static const struct btf_kfunc_id_set bpf_kfunc_set_skb = { 11791 .owner = THIS_MODULE, 11792 .set = &bpf_kfunc_check_set_skb, 11793 }; 11794 11795 static const struct btf_kfunc_id_set bpf_kfunc_set_xdp = { 11796 .owner = THIS_MODULE, 11797 .set = &bpf_kfunc_check_set_xdp, 11798 }; 11799 11800 static int __init bpf_kfunc_init(void) 11801 { 11802 int ret; 11803 11804 ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, &bpf_kfunc_set_skb); 11805 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_ACT, &bpf_kfunc_set_skb); 11806 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SK_SKB, &bpf_kfunc_set_skb); 11807 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SOCKET_FILTER, &bpf_kfunc_set_skb); 11808 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_CGROUP_SKB, &bpf_kfunc_set_skb); 11809 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_OUT, &bpf_kfunc_set_skb); 11810 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_IN, &bpf_kfunc_set_skb); 11811 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_XMIT, &bpf_kfunc_set_skb); 11812 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_SEG6LOCAL, &bpf_kfunc_set_skb); 11813 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_NETFILTER, &bpf_kfunc_set_skb); 11814 return ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP, &bpf_kfunc_set_xdp); 11815 } 11816 late_initcall(bpf_kfunc_init); 11817 11818 /* Disables missing prototype warnings */ 11819 __diag_push(); 11820 __diag_ignore_all("-Wmissing-prototypes", 11821 "Global functions as their definitions will be in vmlinux BTF"); 11822 11823 /* bpf_sock_destroy: Destroy the given socket with ECONNABORTED error code. 11824 * 11825 * The function expects a non-NULL pointer to a socket, and invokes the 11826 * protocol specific socket destroy handlers. 11827 * 11828 * The helper can only be called from BPF contexts that have acquired the socket 11829 * locks. 11830 * 11831 * Parameters: 11832 * @sock: Pointer to socket to be destroyed 11833 * 11834 * Return: 11835 * On error, may return EPROTONOSUPPORT, EINVAL. 11836 * EPROTONOSUPPORT if protocol specific destroy handler is not supported. 11837 * 0 otherwise 11838 */ 11839 __bpf_kfunc int bpf_sock_destroy(struct sock_common *sock) 11840 { 11841 struct sock *sk = (struct sock *)sock; 11842 11843 /* The locking semantics that allow for synchronous execution of the 11844 * destroy handlers are only supported for TCP and UDP. 11845 * Supporting protocols will need to acquire sock lock in the BPF context 11846 * prior to invoking this kfunc. 11847 */ 11848 if (!sk->sk_prot->diag_destroy || (sk->sk_protocol != IPPROTO_TCP && 11849 sk->sk_protocol != IPPROTO_UDP)) 11850 return -EOPNOTSUPP; 11851 11852 return sk->sk_prot->diag_destroy(sk, ECONNABORTED); 11853 } 11854 11855 __diag_pop() 11856 11857 BTF_SET8_START(bpf_sk_iter_kfunc_ids) 11858 BTF_ID_FLAGS(func, bpf_sock_destroy, KF_TRUSTED_ARGS) 11859 BTF_SET8_END(bpf_sk_iter_kfunc_ids) 11860 11861 static int tracing_iter_filter(const struct bpf_prog *prog, u32 kfunc_id) 11862 { 11863 if (btf_id_set8_contains(&bpf_sk_iter_kfunc_ids, kfunc_id) && 11864 prog->expected_attach_type != BPF_TRACE_ITER) 11865 return -EACCES; 11866 return 0; 11867 } 11868 11869 static const struct btf_kfunc_id_set bpf_sk_iter_kfunc_set = { 11870 .owner = THIS_MODULE, 11871 .set = &bpf_sk_iter_kfunc_ids, 11872 .filter = tracing_iter_filter, 11873 }; 11874 11875 static int init_subsystem(void) 11876 { 11877 return register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &bpf_sk_iter_kfunc_set); 11878 } 11879 late_initcall(init_subsystem); 11880