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