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 #include <linux/un.h> 85 #include <net/xdp_sock_drv.h> 86 87 static const struct bpf_func_proto * 88 bpf_sk_base_func_proto(enum bpf_func_id func_id); 89 90 int copy_bpf_fprog_from_user(struct sock_fprog *dst, sockptr_t src, int len) 91 { 92 if (in_compat_syscall()) { 93 struct compat_sock_fprog f32; 94 95 if (len != sizeof(f32)) 96 return -EINVAL; 97 if (copy_from_sockptr(&f32, src, sizeof(f32))) 98 return -EFAULT; 99 memset(dst, 0, sizeof(*dst)); 100 dst->len = f32.len; 101 dst->filter = compat_ptr(f32.filter); 102 } else { 103 if (len != sizeof(*dst)) 104 return -EINVAL; 105 if (copy_from_sockptr(dst, src, sizeof(*dst))) 106 return -EFAULT; 107 } 108 109 return 0; 110 } 111 EXPORT_SYMBOL_GPL(copy_bpf_fprog_from_user); 112 113 /** 114 * sk_filter_trim_cap - run a packet through a socket filter 115 * @sk: sock associated with &sk_buff 116 * @skb: buffer to filter 117 * @cap: limit on how short the eBPF program may trim the packet 118 * 119 * Run the eBPF program and then cut skb->data to correct size returned by 120 * the program. If pkt_len is 0 we toss packet. If skb->len is smaller 121 * than pkt_len we keep whole skb->data. This is the socket level 122 * wrapper to bpf_prog_run. It returns 0 if the packet should 123 * be accepted or -EPERM if the packet should be tossed. 124 * 125 */ 126 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap) 127 { 128 int err; 129 struct sk_filter *filter; 130 131 /* 132 * If the skb was allocated from pfmemalloc reserves, only 133 * allow SOCK_MEMALLOC sockets to use it as this socket is 134 * helping free memory 135 */ 136 if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) { 137 NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP); 138 return -ENOMEM; 139 } 140 err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb); 141 if (err) 142 return err; 143 144 err = security_sock_rcv_skb(sk, skb); 145 if (err) 146 return err; 147 148 rcu_read_lock(); 149 filter = rcu_dereference(sk->sk_filter); 150 if (filter) { 151 struct sock *save_sk = skb->sk; 152 unsigned int pkt_len; 153 154 skb->sk = sk; 155 pkt_len = bpf_prog_run_save_cb(filter->prog, skb); 156 skb->sk = save_sk; 157 err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM; 158 } 159 rcu_read_unlock(); 160 161 return err; 162 } 163 EXPORT_SYMBOL(sk_filter_trim_cap); 164 165 BPF_CALL_1(bpf_skb_get_pay_offset, struct sk_buff *, skb) 166 { 167 return skb_get_poff(skb); 168 } 169 170 BPF_CALL_3(bpf_skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x) 171 { 172 struct nlattr *nla; 173 174 if (skb_is_nonlinear(skb)) 175 return 0; 176 177 if (skb->len < sizeof(struct nlattr)) 178 return 0; 179 180 if (a > skb->len - sizeof(struct nlattr)) 181 return 0; 182 183 nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x); 184 if (nla) 185 return (void *) nla - (void *) skb->data; 186 187 return 0; 188 } 189 190 BPF_CALL_3(bpf_skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x) 191 { 192 struct nlattr *nla; 193 194 if (skb_is_nonlinear(skb)) 195 return 0; 196 197 if (skb->len < sizeof(struct nlattr)) 198 return 0; 199 200 if (a > skb->len - sizeof(struct nlattr)) 201 return 0; 202 203 nla = (struct nlattr *) &skb->data[a]; 204 if (nla->nla_len > skb->len - a) 205 return 0; 206 207 nla = nla_find_nested(nla, x); 208 if (nla) 209 return (void *) nla - (void *) skb->data; 210 211 return 0; 212 } 213 214 BPF_CALL_4(bpf_skb_load_helper_8, const struct sk_buff *, skb, const void *, 215 data, int, headlen, int, offset) 216 { 217 u8 tmp, *ptr; 218 const int len = sizeof(tmp); 219 220 if (offset >= 0) { 221 if (headlen - offset >= len) 222 return *(u8 *)(data + offset); 223 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 224 return tmp; 225 } else { 226 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 227 if (likely(ptr)) 228 return *(u8 *)ptr; 229 } 230 231 return -EFAULT; 232 } 233 234 BPF_CALL_2(bpf_skb_load_helper_8_no_cache, const struct sk_buff *, skb, 235 int, offset) 236 { 237 return ____bpf_skb_load_helper_8(skb, skb->data, skb->len - skb->data_len, 238 offset); 239 } 240 241 BPF_CALL_4(bpf_skb_load_helper_16, const struct sk_buff *, skb, const void *, 242 data, int, headlen, int, offset) 243 { 244 __be16 tmp, *ptr; 245 const int len = sizeof(tmp); 246 247 if (offset >= 0) { 248 if (headlen - offset >= len) 249 return get_unaligned_be16(data + offset); 250 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 251 return be16_to_cpu(tmp); 252 } else { 253 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 254 if (likely(ptr)) 255 return get_unaligned_be16(ptr); 256 } 257 258 return -EFAULT; 259 } 260 261 BPF_CALL_2(bpf_skb_load_helper_16_no_cache, const struct sk_buff *, skb, 262 int, offset) 263 { 264 return ____bpf_skb_load_helper_16(skb, skb->data, skb->len - skb->data_len, 265 offset); 266 } 267 268 BPF_CALL_4(bpf_skb_load_helper_32, const struct sk_buff *, skb, const void *, 269 data, int, headlen, int, offset) 270 { 271 __be32 tmp, *ptr; 272 const int len = sizeof(tmp); 273 274 if (likely(offset >= 0)) { 275 if (headlen - offset >= len) 276 return get_unaligned_be32(data + offset); 277 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) 278 return be32_to_cpu(tmp); 279 } else { 280 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); 281 if (likely(ptr)) 282 return get_unaligned_be32(ptr); 283 } 284 285 return -EFAULT; 286 } 287 288 BPF_CALL_2(bpf_skb_load_helper_32_no_cache, const struct sk_buff *, skb, 289 int, offset) 290 { 291 return ____bpf_skb_load_helper_32(skb, skb->data, skb->len - skb->data_len, 292 offset); 293 } 294 295 static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg, 296 struct bpf_insn *insn_buf) 297 { 298 struct bpf_insn *insn = insn_buf; 299 300 switch (skb_field) { 301 case SKF_AD_MARK: 302 BUILD_BUG_ON(sizeof_field(struct sk_buff, mark) != 4); 303 304 *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg, 305 offsetof(struct sk_buff, mark)); 306 break; 307 308 case SKF_AD_PKTTYPE: 309 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET); 310 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX); 311 #ifdef __BIG_ENDIAN_BITFIELD 312 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5); 313 #endif 314 break; 315 316 case SKF_AD_QUEUE: 317 BUILD_BUG_ON(sizeof_field(struct sk_buff, queue_mapping) != 2); 318 319 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, 320 offsetof(struct sk_buff, queue_mapping)); 321 break; 322 323 case SKF_AD_VLAN_TAG: 324 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_tci) != 2); 325 326 /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */ 327 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, 328 offsetof(struct sk_buff, vlan_tci)); 329 break; 330 case SKF_AD_VLAN_TAG_PRESENT: 331 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_all) != 4); 332 *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg, 333 offsetof(struct sk_buff, vlan_all)); 334 *insn++ = BPF_JMP_IMM(BPF_JEQ, dst_reg, 0, 1); 335 *insn++ = BPF_ALU32_IMM(BPF_MOV, dst_reg, 1); 336 break; 337 } 338 339 return insn - insn_buf; 340 } 341 342 static bool convert_bpf_extensions(struct sock_filter *fp, 343 struct bpf_insn **insnp) 344 { 345 struct bpf_insn *insn = *insnp; 346 u32 cnt; 347 348 switch (fp->k) { 349 case SKF_AD_OFF + SKF_AD_PROTOCOL: 350 BUILD_BUG_ON(sizeof_field(struct sk_buff, protocol) != 2); 351 352 /* A = *(u16 *) (CTX + offsetof(protocol)) */ 353 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, 354 offsetof(struct sk_buff, protocol)); 355 /* A = ntohs(A) [emitting a nop or swap16] */ 356 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); 357 break; 358 359 case SKF_AD_OFF + SKF_AD_PKTTYPE: 360 cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn); 361 insn += cnt - 1; 362 break; 363 364 case SKF_AD_OFF + SKF_AD_IFINDEX: 365 case SKF_AD_OFF + SKF_AD_HATYPE: 366 BUILD_BUG_ON(sizeof_field(struct net_device, ifindex) != 4); 367 BUILD_BUG_ON(sizeof_field(struct net_device, type) != 2); 368 369 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 370 BPF_REG_TMP, BPF_REG_CTX, 371 offsetof(struct sk_buff, dev)); 372 /* if (tmp != 0) goto pc + 1 */ 373 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1); 374 *insn++ = BPF_EXIT_INSN(); 375 if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX) 376 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP, 377 offsetof(struct net_device, ifindex)); 378 else 379 *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP, 380 offsetof(struct net_device, type)); 381 break; 382 383 case SKF_AD_OFF + SKF_AD_MARK: 384 cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn); 385 insn += cnt - 1; 386 break; 387 388 case SKF_AD_OFF + SKF_AD_RXHASH: 389 BUILD_BUG_ON(sizeof_field(struct sk_buff, hash) != 4); 390 391 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, 392 offsetof(struct sk_buff, hash)); 393 break; 394 395 case SKF_AD_OFF + SKF_AD_QUEUE: 396 cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn); 397 insn += cnt - 1; 398 break; 399 400 case SKF_AD_OFF + SKF_AD_VLAN_TAG: 401 cnt = convert_skb_access(SKF_AD_VLAN_TAG, 402 BPF_REG_A, BPF_REG_CTX, insn); 403 insn += cnt - 1; 404 break; 405 406 case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT: 407 cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT, 408 BPF_REG_A, BPF_REG_CTX, insn); 409 insn += cnt - 1; 410 break; 411 412 case SKF_AD_OFF + SKF_AD_VLAN_TPID: 413 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_proto) != 2); 414 415 /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */ 416 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, 417 offsetof(struct sk_buff, vlan_proto)); 418 /* A = ntohs(A) [emitting a nop or swap16] */ 419 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); 420 break; 421 422 case SKF_AD_OFF + SKF_AD_PAY_OFFSET: 423 case SKF_AD_OFF + SKF_AD_NLATTR: 424 case SKF_AD_OFF + SKF_AD_NLATTR_NEST: 425 case SKF_AD_OFF + SKF_AD_CPU: 426 case SKF_AD_OFF + SKF_AD_RANDOM: 427 /* arg1 = CTX */ 428 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); 429 /* arg2 = A */ 430 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A); 431 /* arg3 = X */ 432 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X); 433 /* Emit call(arg1=CTX, arg2=A, arg3=X) */ 434 switch (fp->k) { 435 case SKF_AD_OFF + SKF_AD_PAY_OFFSET: 436 *insn = BPF_EMIT_CALL(bpf_skb_get_pay_offset); 437 break; 438 case SKF_AD_OFF + SKF_AD_NLATTR: 439 *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr); 440 break; 441 case SKF_AD_OFF + SKF_AD_NLATTR_NEST: 442 *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr_nest); 443 break; 444 case SKF_AD_OFF + SKF_AD_CPU: 445 *insn = BPF_EMIT_CALL(bpf_get_raw_cpu_id); 446 break; 447 case SKF_AD_OFF + SKF_AD_RANDOM: 448 *insn = BPF_EMIT_CALL(bpf_user_rnd_u32); 449 bpf_user_rnd_init_once(); 450 break; 451 } 452 break; 453 454 case SKF_AD_OFF + SKF_AD_ALU_XOR_X: 455 /* A ^= X */ 456 *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X); 457 break; 458 459 default: 460 /* This is just a dummy call to avoid letting the compiler 461 * evict __bpf_call_base() as an optimization. Placed here 462 * where no-one bothers. 463 */ 464 BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0); 465 return false; 466 } 467 468 *insnp = insn; 469 return true; 470 } 471 472 static bool convert_bpf_ld_abs(struct sock_filter *fp, struct bpf_insn **insnp) 473 { 474 const bool unaligned_ok = IS_BUILTIN(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS); 475 int size = bpf_size_to_bytes(BPF_SIZE(fp->code)); 476 bool endian = BPF_SIZE(fp->code) == BPF_H || 477 BPF_SIZE(fp->code) == BPF_W; 478 bool indirect = BPF_MODE(fp->code) == BPF_IND; 479 const int ip_align = NET_IP_ALIGN; 480 struct bpf_insn *insn = *insnp; 481 int offset = fp->k; 482 483 if (!indirect && 484 ((unaligned_ok && offset >= 0) || 485 (!unaligned_ok && offset >= 0 && 486 offset + ip_align >= 0 && 487 offset + ip_align % size == 0))) { 488 bool ldx_off_ok = offset <= S16_MAX; 489 490 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_H); 491 if (offset) 492 *insn++ = BPF_ALU64_IMM(BPF_SUB, BPF_REG_TMP, offset); 493 *insn++ = BPF_JMP_IMM(BPF_JSLT, BPF_REG_TMP, 494 size, 2 + endian + (!ldx_off_ok * 2)); 495 if (ldx_off_ok) { 496 *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, 497 BPF_REG_D, offset); 498 } else { 499 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_D); 500 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_TMP, offset); 501 *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, 502 BPF_REG_TMP, 0); 503 } 504 if (endian) 505 *insn++ = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, size * 8); 506 *insn++ = BPF_JMP_A(8); 507 } 508 509 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); 510 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_D); 511 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_H); 512 if (!indirect) { 513 *insn++ = BPF_MOV64_IMM(BPF_REG_ARG4, offset); 514 } else { 515 *insn++ = BPF_MOV64_REG(BPF_REG_ARG4, BPF_REG_X); 516 if (fp->k) 517 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_ARG4, offset); 518 } 519 520 switch (BPF_SIZE(fp->code)) { 521 case BPF_B: 522 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8); 523 break; 524 case BPF_H: 525 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16); 526 break; 527 case BPF_W: 528 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32); 529 break; 530 default: 531 return false; 532 } 533 534 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_A, 0, 2); 535 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 536 *insn = BPF_EXIT_INSN(); 537 538 *insnp = insn; 539 return true; 540 } 541 542 /** 543 * bpf_convert_filter - convert filter program 544 * @prog: the user passed filter program 545 * @len: the length of the user passed filter program 546 * @new_prog: allocated 'struct bpf_prog' or NULL 547 * @new_len: pointer to store length of converted program 548 * @seen_ld_abs: bool whether we've seen ld_abs/ind 549 * 550 * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn' 551 * style extended BPF (eBPF). 552 * Conversion workflow: 553 * 554 * 1) First pass for calculating the new program length: 555 * bpf_convert_filter(old_prog, old_len, NULL, &new_len, &seen_ld_abs) 556 * 557 * 2) 2nd pass to remap in two passes: 1st pass finds new 558 * jump offsets, 2nd pass remapping: 559 * bpf_convert_filter(old_prog, old_len, new_prog, &new_len, &seen_ld_abs) 560 */ 561 static int bpf_convert_filter(struct sock_filter *prog, int len, 562 struct bpf_prog *new_prog, int *new_len, 563 bool *seen_ld_abs) 564 { 565 int new_flen = 0, pass = 0, target, i, stack_off; 566 struct bpf_insn *new_insn, *first_insn = NULL; 567 struct sock_filter *fp; 568 int *addrs = NULL; 569 u8 bpf_src; 570 571 BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK); 572 BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG); 573 574 if (len <= 0 || len > BPF_MAXINSNS) 575 return -EINVAL; 576 577 if (new_prog) { 578 first_insn = new_prog->insnsi; 579 addrs = kcalloc(len, sizeof(*addrs), 580 GFP_KERNEL | __GFP_NOWARN); 581 if (!addrs) 582 return -ENOMEM; 583 } 584 585 do_pass: 586 new_insn = first_insn; 587 fp = prog; 588 589 /* Classic BPF related prologue emission. */ 590 if (new_prog) { 591 /* Classic BPF expects A and X to be reset first. These need 592 * to be guaranteed to be the first two instructions. 593 */ 594 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 595 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_X, BPF_REG_X); 596 597 /* All programs must keep CTX in callee saved BPF_REG_CTX. 598 * In eBPF case it's done by the compiler, here we need to 599 * do this ourself. Initial CTX is present in BPF_REG_ARG1. 600 */ 601 *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1); 602 if (*seen_ld_abs) { 603 /* For packet access in classic BPF, cache skb->data 604 * in callee-saved BPF R8 and skb->len - skb->data_len 605 * (headlen) in BPF R9. Since classic BPF is read-only 606 * on CTX, we only need to cache it once. 607 */ 608 *new_insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 609 BPF_REG_D, BPF_REG_CTX, 610 offsetof(struct sk_buff, data)); 611 *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_H, BPF_REG_CTX, 612 offsetof(struct sk_buff, len)); 613 *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_TMP, BPF_REG_CTX, 614 offsetof(struct sk_buff, data_len)); 615 *new_insn++ = BPF_ALU32_REG(BPF_SUB, BPF_REG_H, BPF_REG_TMP); 616 } 617 } else { 618 new_insn += 3; 619 } 620 621 for (i = 0; i < len; fp++, i++) { 622 struct bpf_insn tmp_insns[32] = { }; 623 struct bpf_insn *insn = tmp_insns; 624 625 if (addrs) 626 addrs[i] = new_insn - first_insn; 627 628 switch (fp->code) { 629 /* All arithmetic insns and skb loads map as-is. */ 630 case BPF_ALU | BPF_ADD | BPF_X: 631 case BPF_ALU | BPF_ADD | BPF_K: 632 case BPF_ALU | BPF_SUB | BPF_X: 633 case BPF_ALU | BPF_SUB | BPF_K: 634 case BPF_ALU | BPF_AND | BPF_X: 635 case BPF_ALU | BPF_AND | BPF_K: 636 case BPF_ALU | BPF_OR | BPF_X: 637 case BPF_ALU | BPF_OR | BPF_K: 638 case BPF_ALU | BPF_LSH | BPF_X: 639 case BPF_ALU | BPF_LSH | BPF_K: 640 case BPF_ALU | BPF_RSH | BPF_X: 641 case BPF_ALU | BPF_RSH | BPF_K: 642 case BPF_ALU | BPF_XOR | BPF_X: 643 case BPF_ALU | BPF_XOR | BPF_K: 644 case BPF_ALU | BPF_MUL | BPF_X: 645 case BPF_ALU | BPF_MUL | BPF_K: 646 case BPF_ALU | BPF_DIV | BPF_X: 647 case BPF_ALU | BPF_DIV | BPF_K: 648 case BPF_ALU | BPF_MOD | BPF_X: 649 case BPF_ALU | BPF_MOD | BPF_K: 650 case BPF_ALU | BPF_NEG: 651 case BPF_LD | BPF_ABS | BPF_W: 652 case BPF_LD | BPF_ABS | BPF_H: 653 case BPF_LD | BPF_ABS | BPF_B: 654 case BPF_LD | BPF_IND | BPF_W: 655 case BPF_LD | BPF_IND | BPF_H: 656 case BPF_LD | BPF_IND | BPF_B: 657 /* Check for overloaded BPF extension and 658 * directly convert it if found, otherwise 659 * just move on with mapping. 660 */ 661 if (BPF_CLASS(fp->code) == BPF_LD && 662 BPF_MODE(fp->code) == BPF_ABS && 663 convert_bpf_extensions(fp, &insn)) 664 break; 665 if (BPF_CLASS(fp->code) == BPF_LD && 666 convert_bpf_ld_abs(fp, &insn)) { 667 *seen_ld_abs = true; 668 break; 669 } 670 671 if (fp->code == (BPF_ALU | BPF_DIV | BPF_X) || 672 fp->code == (BPF_ALU | BPF_MOD | BPF_X)) { 673 *insn++ = BPF_MOV32_REG(BPF_REG_X, BPF_REG_X); 674 /* Error with exception code on div/mod by 0. 675 * For cBPF programs, this was always return 0. 676 */ 677 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_X, 0, 2); 678 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); 679 *insn++ = BPF_EXIT_INSN(); 680 } 681 682 *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k); 683 break; 684 685 /* Jump transformation cannot use BPF block macros 686 * everywhere as offset calculation and target updates 687 * require a bit more work than the rest, i.e. jump 688 * opcodes map as-is, but offsets need adjustment. 689 */ 690 691 #define BPF_EMIT_JMP \ 692 do { \ 693 const s32 off_min = S16_MIN, off_max = S16_MAX; \ 694 s32 off; \ 695 \ 696 if (target >= len || target < 0) \ 697 goto err; \ 698 off = addrs ? addrs[target] - addrs[i] - 1 : 0; \ 699 /* Adjust pc relative offset for 2nd or 3rd insn. */ \ 700 off -= insn - tmp_insns; \ 701 /* Reject anything not fitting into insn->off. */ \ 702 if (off < off_min || off > off_max) \ 703 goto err; \ 704 insn->off = off; \ 705 } while (0) 706 707 case BPF_JMP | BPF_JA: 708 target = i + fp->k + 1; 709 insn->code = fp->code; 710 BPF_EMIT_JMP; 711 break; 712 713 case BPF_JMP | BPF_JEQ | BPF_K: 714 case BPF_JMP | BPF_JEQ | BPF_X: 715 case BPF_JMP | BPF_JSET | BPF_K: 716 case BPF_JMP | BPF_JSET | BPF_X: 717 case BPF_JMP | BPF_JGT | BPF_K: 718 case BPF_JMP | BPF_JGT | BPF_X: 719 case BPF_JMP | BPF_JGE | BPF_K: 720 case BPF_JMP | BPF_JGE | BPF_X: 721 if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) { 722 /* BPF immediates are signed, zero extend 723 * immediate into tmp register and use it 724 * in compare insn. 725 */ 726 *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k); 727 728 insn->dst_reg = BPF_REG_A; 729 insn->src_reg = BPF_REG_TMP; 730 bpf_src = BPF_X; 731 } else { 732 insn->dst_reg = BPF_REG_A; 733 insn->imm = fp->k; 734 bpf_src = BPF_SRC(fp->code); 735 insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0; 736 } 737 738 /* Common case where 'jump_false' is next insn. */ 739 if (fp->jf == 0) { 740 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; 741 target = i + fp->jt + 1; 742 BPF_EMIT_JMP; 743 break; 744 } 745 746 /* Convert some jumps when 'jump_true' is next insn. */ 747 if (fp->jt == 0) { 748 switch (BPF_OP(fp->code)) { 749 case BPF_JEQ: 750 insn->code = BPF_JMP | BPF_JNE | bpf_src; 751 break; 752 case BPF_JGT: 753 insn->code = BPF_JMP | BPF_JLE | bpf_src; 754 break; 755 case BPF_JGE: 756 insn->code = BPF_JMP | BPF_JLT | bpf_src; 757 break; 758 default: 759 goto jmp_rest; 760 } 761 762 target = i + fp->jf + 1; 763 BPF_EMIT_JMP; 764 break; 765 } 766 jmp_rest: 767 /* Other jumps are mapped into two insns: Jxx and JA. */ 768 target = i + fp->jt + 1; 769 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; 770 BPF_EMIT_JMP; 771 insn++; 772 773 insn->code = BPF_JMP | BPF_JA; 774 target = i + fp->jf + 1; 775 BPF_EMIT_JMP; 776 break; 777 778 /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */ 779 case BPF_LDX | BPF_MSH | BPF_B: { 780 struct sock_filter tmp = { 781 .code = BPF_LD | BPF_ABS | BPF_B, 782 .k = fp->k, 783 }; 784 785 *seen_ld_abs = true; 786 787 /* X = A */ 788 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 789 /* A = BPF_R0 = *(u8 *) (skb->data + K) */ 790 convert_bpf_ld_abs(&tmp, &insn); 791 insn++; 792 /* A &= 0xf */ 793 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf); 794 /* A <<= 2 */ 795 *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2); 796 /* tmp = X */ 797 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_X); 798 /* X = A */ 799 *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 800 /* A = tmp */ 801 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP); 802 break; 803 } 804 /* RET_K is remaped into 2 insns. RET_A case doesn't need an 805 * extra mov as BPF_REG_0 is already mapped into BPF_REG_A. 806 */ 807 case BPF_RET | BPF_A: 808 case BPF_RET | BPF_K: 809 if (BPF_RVAL(fp->code) == BPF_K) 810 *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0, 811 0, fp->k); 812 *insn = BPF_EXIT_INSN(); 813 break; 814 815 /* Store to stack. */ 816 case BPF_ST: 817 case BPF_STX: 818 stack_off = fp->k * 4 + 4; 819 *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) == 820 BPF_ST ? BPF_REG_A : BPF_REG_X, 821 -stack_off); 822 /* check_load_and_stores() verifies that classic BPF can 823 * load from stack only after write, so tracking 824 * stack_depth for ST|STX insns is enough 825 */ 826 if (new_prog && new_prog->aux->stack_depth < stack_off) 827 new_prog->aux->stack_depth = stack_off; 828 break; 829 830 /* Load from stack. */ 831 case BPF_LD | BPF_MEM: 832 case BPF_LDX | BPF_MEM: 833 stack_off = fp->k * 4 + 4; 834 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? 835 BPF_REG_A : BPF_REG_X, BPF_REG_FP, 836 -stack_off); 837 break; 838 839 /* A = K or X = K */ 840 case BPF_LD | BPF_IMM: 841 case BPF_LDX | BPF_IMM: 842 *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ? 843 BPF_REG_A : BPF_REG_X, fp->k); 844 break; 845 846 /* X = A */ 847 case BPF_MISC | BPF_TAX: 848 *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); 849 break; 850 851 /* A = X */ 852 case BPF_MISC | BPF_TXA: 853 *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X); 854 break; 855 856 /* A = skb->len or X = skb->len */ 857 case BPF_LD | BPF_W | BPF_LEN: 858 case BPF_LDX | BPF_W | BPF_LEN: 859 *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? 860 BPF_REG_A : BPF_REG_X, BPF_REG_CTX, 861 offsetof(struct sk_buff, len)); 862 break; 863 864 /* Access seccomp_data fields. */ 865 case BPF_LDX | BPF_ABS | BPF_W: 866 /* A = *(u32 *) (ctx + K) */ 867 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k); 868 break; 869 870 /* Unknown instruction. */ 871 default: 872 goto err; 873 } 874 875 insn++; 876 if (new_prog) 877 memcpy(new_insn, tmp_insns, 878 sizeof(*insn) * (insn - tmp_insns)); 879 new_insn += insn - tmp_insns; 880 } 881 882 if (!new_prog) { 883 /* Only calculating new length. */ 884 *new_len = new_insn - first_insn; 885 if (*seen_ld_abs) 886 *new_len += 4; /* Prologue bits. */ 887 return 0; 888 } 889 890 pass++; 891 if (new_flen != new_insn - first_insn) { 892 new_flen = new_insn - first_insn; 893 if (pass > 2) 894 goto err; 895 goto do_pass; 896 } 897 898 kfree(addrs); 899 BUG_ON(*new_len != new_flen); 900 return 0; 901 err: 902 kfree(addrs); 903 return -EINVAL; 904 } 905 906 /* Security: 907 * 908 * As we dont want to clear mem[] array for each packet going through 909 * __bpf_prog_run(), we check that filter loaded by user never try to read 910 * a cell if not previously written, and we check all branches to be sure 911 * a malicious user doesn't try to abuse us. 912 */ 913 static int check_load_and_stores(const struct sock_filter *filter, int flen) 914 { 915 u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */ 916 int pc, ret = 0; 917 918 BUILD_BUG_ON(BPF_MEMWORDS > 16); 919 920 masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL); 921 if (!masks) 922 return -ENOMEM; 923 924 memset(masks, 0xff, flen * sizeof(*masks)); 925 926 for (pc = 0; pc < flen; pc++) { 927 memvalid &= masks[pc]; 928 929 switch (filter[pc].code) { 930 case BPF_ST: 931 case BPF_STX: 932 memvalid |= (1 << filter[pc].k); 933 break; 934 case BPF_LD | BPF_MEM: 935 case BPF_LDX | BPF_MEM: 936 if (!(memvalid & (1 << filter[pc].k))) { 937 ret = -EINVAL; 938 goto error; 939 } 940 break; 941 case BPF_JMP | BPF_JA: 942 /* A jump must set masks on target */ 943 masks[pc + 1 + filter[pc].k] &= memvalid; 944 memvalid = ~0; 945 break; 946 case BPF_JMP | BPF_JEQ | BPF_K: 947 case BPF_JMP | BPF_JEQ | BPF_X: 948 case BPF_JMP | BPF_JGE | BPF_K: 949 case BPF_JMP | BPF_JGE | BPF_X: 950 case BPF_JMP | BPF_JGT | BPF_K: 951 case BPF_JMP | BPF_JGT | BPF_X: 952 case BPF_JMP | BPF_JSET | BPF_K: 953 case BPF_JMP | BPF_JSET | BPF_X: 954 /* A jump must set masks on targets */ 955 masks[pc + 1 + filter[pc].jt] &= memvalid; 956 masks[pc + 1 + filter[pc].jf] &= memvalid; 957 memvalid = ~0; 958 break; 959 } 960 } 961 error: 962 kfree(masks); 963 return ret; 964 } 965 966 static bool chk_code_allowed(u16 code_to_probe) 967 { 968 static const bool codes[] = { 969 /* 32 bit ALU operations */ 970 [BPF_ALU | BPF_ADD | BPF_K] = true, 971 [BPF_ALU | BPF_ADD | BPF_X] = true, 972 [BPF_ALU | BPF_SUB | BPF_K] = true, 973 [BPF_ALU | BPF_SUB | BPF_X] = true, 974 [BPF_ALU | BPF_MUL | BPF_K] = true, 975 [BPF_ALU | BPF_MUL | BPF_X] = true, 976 [BPF_ALU | BPF_DIV | BPF_K] = true, 977 [BPF_ALU | BPF_DIV | BPF_X] = true, 978 [BPF_ALU | BPF_MOD | BPF_K] = true, 979 [BPF_ALU | BPF_MOD | BPF_X] = true, 980 [BPF_ALU | BPF_AND | BPF_K] = true, 981 [BPF_ALU | BPF_AND | BPF_X] = true, 982 [BPF_ALU | BPF_OR | BPF_K] = true, 983 [BPF_ALU | BPF_OR | BPF_X] = true, 984 [BPF_ALU | BPF_XOR | BPF_K] = true, 985 [BPF_ALU | BPF_XOR | BPF_X] = true, 986 [BPF_ALU | BPF_LSH | BPF_K] = true, 987 [BPF_ALU | BPF_LSH | BPF_X] = true, 988 [BPF_ALU | BPF_RSH | BPF_K] = true, 989 [BPF_ALU | BPF_RSH | BPF_X] = true, 990 [BPF_ALU | BPF_NEG] = true, 991 /* Load instructions */ 992 [BPF_LD | BPF_W | BPF_ABS] = true, 993 [BPF_LD | BPF_H | BPF_ABS] = true, 994 [BPF_LD | BPF_B | BPF_ABS] = true, 995 [BPF_LD | BPF_W | BPF_LEN] = true, 996 [BPF_LD | BPF_W | BPF_IND] = true, 997 [BPF_LD | BPF_H | BPF_IND] = true, 998 [BPF_LD | BPF_B | BPF_IND] = true, 999 [BPF_LD | BPF_IMM] = true, 1000 [BPF_LD | BPF_MEM] = true, 1001 [BPF_LDX | BPF_W | BPF_LEN] = true, 1002 [BPF_LDX | BPF_B | BPF_MSH] = true, 1003 [BPF_LDX | BPF_IMM] = true, 1004 [BPF_LDX | BPF_MEM] = true, 1005 /* Store instructions */ 1006 [BPF_ST] = true, 1007 [BPF_STX] = true, 1008 /* Misc instructions */ 1009 [BPF_MISC | BPF_TAX] = true, 1010 [BPF_MISC | BPF_TXA] = true, 1011 /* Return instructions */ 1012 [BPF_RET | BPF_K] = true, 1013 [BPF_RET | BPF_A] = true, 1014 /* Jump instructions */ 1015 [BPF_JMP | BPF_JA] = true, 1016 [BPF_JMP | BPF_JEQ | BPF_K] = true, 1017 [BPF_JMP | BPF_JEQ | BPF_X] = true, 1018 [BPF_JMP | BPF_JGE | BPF_K] = true, 1019 [BPF_JMP | BPF_JGE | BPF_X] = true, 1020 [BPF_JMP | BPF_JGT | BPF_K] = true, 1021 [BPF_JMP | BPF_JGT | BPF_X] = true, 1022 [BPF_JMP | BPF_JSET | BPF_K] = true, 1023 [BPF_JMP | BPF_JSET | BPF_X] = true, 1024 }; 1025 1026 if (code_to_probe >= ARRAY_SIZE(codes)) 1027 return false; 1028 1029 return codes[code_to_probe]; 1030 } 1031 1032 static bool bpf_check_basics_ok(const struct sock_filter *filter, 1033 unsigned int flen) 1034 { 1035 if (filter == NULL) 1036 return false; 1037 if (flen == 0 || flen > BPF_MAXINSNS) 1038 return false; 1039 1040 return true; 1041 } 1042 1043 /** 1044 * bpf_check_classic - verify socket filter code 1045 * @filter: filter to verify 1046 * @flen: length of filter 1047 * 1048 * Check the user's filter code. If we let some ugly 1049 * filter code slip through kaboom! The filter must contain 1050 * no references or jumps that are out of range, no illegal 1051 * instructions, and must end with a RET instruction. 1052 * 1053 * All jumps are forward as they are not signed. 1054 * 1055 * Returns 0 if the rule set is legal or -EINVAL if not. 1056 */ 1057 static int bpf_check_classic(const struct sock_filter *filter, 1058 unsigned int flen) 1059 { 1060 bool anc_found; 1061 int pc; 1062 1063 /* Check the filter code now */ 1064 for (pc = 0; pc < flen; pc++) { 1065 const struct sock_filter *ftest = &filter[pc]; 1066 1067 /* May we actually operate on this code? */ 1068 if (!chk_code_allowed(ftest->code)) 1069 return -EINVAL; 1070 1071 /* Some instructions need special checks */ 1072 switch (ftest->code) { 1073 case BPF_ALU | BPF_DIV | BPF_K: 1074 case BPF_ALU | BPF_MOD | BPF_K: 1075 /* Check for division by zero */ 1076 if (ftest->k == 0) 1077 return -EINVAL; 1078 break; 1079 case BPF_ALU | BPF_LSH | BPF_K: 1080 case BPF_ALU | BPF_RSH | BPF_K: 1081 if (ftest->k >= 32) 1082 return -EINVAL; 1083 break; 1084 case BPF_LD | BPF_MEM: 1085 case BPF_LDX | BPF_MEM: 1086 case BPF_ST: 1087 case BPF_STX: 1088 /* Check for invalid memory addresses */ 1089 if (ftest->k >= BPF_MEMWORDS) 1090 return -EINVAL; 1091 break; 1092 case BPF_JMP | BPF_JA: 1093 /* Note, the large ftest->k might cause loops. 1094 * Compare this with conditional jumps below, 1095 * where offsets are limited. --ANK (981016) 1096 */ 1097 if (ftest->k >= (unsigned int)(flen - pc - 1)) 1098 return -EINVAL; 1099 break; 1100 case BPF_JMP | BPF_JEQ | BPF_K: 1101 case BPF_JMP | BPF_JEQ | BPF_X: 1102 case BPF_JMP | BPF_JGE | BPF_K: 1103 case BPF_JMP | BPF_JGE | BPF_X: 1104 case BPF_JMP | BPF_JGT | BPF_K: 1105 case BPF_JMP | BPF_JGT | BPF_X: 1106 case BPF_JMP | BPF_JSET | BPF_K: 1107 case BPF_JMP | BPF_JSET | BPF_X: 1108 /* Both conditionals must be safe */ 1109 if (pc + ftest->jt + 1 >= flen || 1110 pc + ftest->jf + 1 >= flen) 1111 return -EINVAL; 1112 break; 1113 case BPF_LD | BPF_W | BPF_ABS: 1114 case BPF_LD | BPF_H | BPF_ABS: 1115 case BPF_LD | BPF_B | BPF_ABS: 1116 anc_found = false; 1117 if (bpf_anc_helper(ftest) & BPF_ANC) 1118 anc_found = true; 1119 /* Ancillary operation unknown or unsupported */ 1120 if (anc_found == false && ftest->k >= SKF_AD_OFF) 1121 return -EINVAL; 1122 } 1123 } 1124 1125 /* Last instruction must be a RET code */ 1126 switch (filter[flen - 1].code) { 1127 case BPF_RET | BPF_K: 1128 case BPF_RET | BPF_A: 1129 return check_load_and_stores(filter, flen); 1130 } 1131 1132 return -EINVAL; 1133 } 1134 1135 static int bpf_prog_store_orig_filter(struct bpf_prog *fp, 1136 const struct sock_fprog *fprog) 1137 { 1138 unsigned int fsize = bpf_classic_proglen(fprog); 1139 struct sock_fprog_kern *fkprog; 1140 1141 fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL); 1142 if (!fp->orig_prog) 1143 return -ENOMEM; 1144 1145 fkprog = fp->orig_prog; 1146 fkprog->len = fprog->len; 1147 1148 fkprog->filter = kmemdup(fp->insns, fsize, 1149 GFP_KERNEL | __GFP_NOWARN); 1150 if (!fkprog->filter) { 1151 kfree(fp->orig_prog); 1152 return -ENOMEM; 1153 } 1154 1155 return 0; 1156 } 1157 1158 static void bpf_release_orig_filter(struct bpf_prog *fp) 1159 { 1160 struct sock_fprog_kern *fprog = fp->orig_prog; 1161 1162 if (fprog) { 1163 kfree(fprog->filter); 1164 kfree(fprog); 1165 } 1166 } 1167 1168 static void __bpf_prog_release(struct bpf_prog *prog) 1169 { 1170 if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) { 1171 bpf_prog_put(prog); 1172 } else { 1173 bpf_release_orig_filter(prog); 1174 bpf_prog_free(prog); 1175 } 1176 } 1177 1178 static void __sk_filter_release(struct sk_filter *fp) 1179 { 1180 __bpf_prog_release(fp->prog); 1181 kfree(fp); 1182 } 1183 1184 /** 1185 * sk_filter_release_rcu - Release a socket filter by rcu_head 1186 * @rcu: rcu_head that contains the sk_filter to free 1187 */ 1188 static void sk_filter_release_rcu(struct rcu_head *rcu) 1189 { 1190 struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu); 1191 1192 __sk_filter_release(fp); 1193 } 1194 1195 /** 1196 * sk_filter_release - release a socket filter 1197 * @fp: filter to remove 1198 * 1199 * Remove a filter from a socket and release its resources. 1200 */ 1201 static void sk_filter_release(struct sk_filter *fp) 1202 { 1203 if (refcount_dec_and_test(&fp->refcnt)) 1204 call_rcu(&fp->rcu, sk_filter_release_rcu); 1205 } 1206 1207 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) 1208 { 1209 u32 filter_size = bpf_prog_size(fp->prog->len); 1210 1211 atomic_sub(filter_size, &sk->sk_omem_alloc); 1212 sk_filter_release(fp); 1213 } 1214 1215 /* try to charge the socket memory if there is space available 1216 * return true on success 1217 */ 1218 static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp) 1219 { 1220 u32 filter_size = bpf_prog_size(fp->prog->len); 1221 int optmem_max = READ_ONCE(sysctl_optmem_max); 1222 1223 /* same check as in sock_kmalloc() */ 1224 if (filter_size <= optmem_max && 1225 atomic_read(&sk->sk_omem_alloc) + filter_size < optmem_max) { 1226 atomic_add(filter_size, &sk->sk_omem_alloc); 1227 return true; 1228 } 1229 return false; 1230 } 1231 1232 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp) 1233 { 1234 if (!refcount_inc_not_zero(&fp->refcnt)) 1235 return false; 1236 1237 if (!__sk_filter_charge(sk, fp)) { 1238 sk_filter_release(fp); 1239 return false; 1240 } 1241 return true; 1242 } 1243 1244 static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp) 1245 { 1246 struct sock_filter *old_prog; 1247 struct bpf_prog *old_fp; 1248 int err, new_len, old_len = fp->len; 1249 bool seen_ld_abs = false; 1250 1251 /* We are free to overwrite insns et al right here as it won't be used at 1252 * this point in time anymore internally after the migration to the eBPF 1253 * instruction representation. 1254 */ 1255 BUILD_BUG_ON(sizeof(struct sock_filter) != 1256 sizeof(struct bpf_insn)); 1257 1258 /* Conversion cannot happen on overlapping memory areas, 1259 * so we need to keep the user BPF around until the 2nd 1260 * pass. At this time, the user BPF is stored in fp->insns. 1261 */ 1262 old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter), 1263 GFP_KERNEL | __GFP_NOWARN); 1264 if (!old_prog) { 1265 err = -ENOMEM; 1266 goto out_err; 1267 } 1268 1269 /* 1st pass: calculate the new program length. */ 1270 err = bpf_convert_filter(old_prog, old_len, NULL, &new_len, 1271 &seen_ld_abs); 1272 if (err) 1273 goto out_err_free; 1274 1275 /* Expand fp for appending the new filter representation. */ 1276 old_fp = fp; 1277 fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0); 1278 if (!fp) { 1279 /* The old_fp is still around in case we couldn't 1280 * allocate new memory, so uncharge on that one. 1281 */ 1282 fp = old_fp; 1283 err = -ENOMEM; 1284 goto out_err_free; 1285 } 1286 1287 fp->len = new_len; 1288 1289 /* 2nd pass: remap sock_filter insns into bpf_insn insns. */ 1290 err = bpf_convert_filter(old_prog, old_len, fp, &new_len, 1291 &seen_ld_abs); 1292 if (err) 1293 /* 2nd bpf_convert_filter() can fail only if it fails 1294 * to allocate memory, remapping must succeed. Note, 1295 * that at this time old_fp has already been released 1296 * by krealloc(). 1297 */ 1298 goto out_err_free; 1299 1300 fp = bpf_prog_select_runtime(fp, &err); 1301 if (err) 1302 goto out_err_free; 1303 1304 kfree(old_prog); 1305 return fp; 1306 1307 out_err_free: 1308 kfree(old_prog); 1309 out_err: 1310 __bpf_prog_release(fp); 1311 return ERR_PTR(err); 1312 } 1313 1314 static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp, 1315 bpf_aux_classic_check_t trans) 1316 { 1317 int err; 1318 1319 fp->bpf_func = NULL; 1320 fp->jited = 0; 1321 1322 err = bpf_check_classic(fp->insns, fp->len); 1323 if (err) { 1324 __bpf_prog_release(fp); 1325 return ERR_PTR(err); 1326 } 1327 1328 /* There might be additional checks and transformations 1329 * needed on classic filters, f.e. in case of seccomp. 1330 */ 1331 if (trans) { 1332 err = trans(fp->insns, fp->len); 1333 if (err) { 1334 __bpf_prog_release(fp); 1335 return ERR_PTR(err); 1336 } 1337 } 1338 1339 /* Probe if we can JIT compile the filter and if so, do 1340 * the compilation of the filter. 1341 */ 1342 bpf_jit_compile(fp); 1343 1344 /* JIT compiler couldn't process this filter, so do the eBPF translation 1345 * for the optimized interpreter. 1346 */ 1347 if (!fp->jited) 1348 fp = bpf_migrate_filter(fp); 1349 1350 return fp; 1351 } 1352 1353 /** 1354 * bpf_prog_create - create an unattached filter 1355 * @pfp: the unattached filter that is created 1356 * @fprog: the filter program 1357 * 1358 * Create a filter independent of any socket. We first run some 1359 * sanity checks on it to make sure it does not explode on us later. 1360 * If an error occurs or there is insufficient memory for the filter 1361 * a negative errno code is returned. On success the return is zero. 1362 */ 1363 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog) 1364 { 1365 unsigned int fsize = bpf_classic_proglen(fprog); 1366 struct bpf_prog *fp; 1367 1368 /* Make sure new filter is there and in the right amounts. */ 1369 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1370 return -EINVAL; 1371 1372 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1373 if (!fp) 1374 return -ENOMEM; 1375 1376 memcpy(fp->insns, fprog->filter, fsize); 1377 1378 fp->len = fprog->len; 1379 /* Since unattached filters are not copied back to user 1380 * space through sk_get_filter(), we do not need to hold 1381 * a copy here, and can spare us the work. 1382 */ 1383 fp->orig_prog = NULL; 1384 1385 /* bpf_prepare_filter() already takes care of freeing 1386 * memory in case something goes wrong. 1387 */ 1388 fp = bpf_prepare_filter(fp, NULL); 1389 if (IS_ERR(fp)) 1390 return PTR_ERR(fp); 1391 1392 *pfp = fp; 1393 return 0; 1394 } 1395 EXPORT_SYMBOL_GPL(bpf_prog_create); 1396 1397 /** 1398 * bpf_prog_create_from_user - create an unattached filter from user buffer 1399 * @pfp: the unattached filter that is created 1400 * @fprog: the filter program 1401 * @trans: post-classic verifier transformation handler 1402 * @save_orig: save classic BPF program 1403 * 1404 * This function effectively does the same as bpf_prog_create(), only 1405 * that it builds up its insns buffer from user space provided buffer. 1406 * It also allows for passing a bpf_aux_classic_check_t handler. 1407 */ 1408 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, 1409 bpf_aux_classic_check_t trans, bool save_orig) 1410 { 1411 unsigned int fsize = bpf_classic_proglen(fprog); 1412 struct bpf_prog *fp; 1413 int err; 1414 1415 /* Make sure new filter is there and in the right amounts. */ 1416 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1417 return -EINVAL; 1418 1419 fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1420 if (!fp) 1421 return -ENOMEM; 1422 1423 if (copy_from_user(fp->insns, fprog->filter, fsize)) { 1424 __bpf_prog_free(fp); 1425 return -EFAULT; 1426 } 1427 1428 fp->len = fprog->len; 1429 fp->orig_prog = NULL; 1430 1431 if (save_orig) { 1432 err = bpf_prog_store_orig_filter(fp, fprog); 1433 if (err) { 1434 __bpf_prog_free(fp); 1435 return -ENOMEM; 1436 } 1437 } 1438 1439 /* bpf_prepare_filter() already takes care of freeing 1440 * memory in case something goes wrong. 1441 */ 1442 fp = bpf_prepare_filter(fp, trans); 1443 if (IS_ERR(fp)) 1444 return PTR_ERR(fp); 1445 1446 *pfp = fp; 1447 return 0; 1448 } 1449 EXPORT_SYMBOL_GPL(bpf_prog_create_from_user); 1450 1451 void bpf_prog_destroy(struct bpf_prog *fp) 1452 { 1453 __bpf_prog_release(fp); 1454 } 1455 EXPORT_SYMBOL_GPL(bpf_prog_destroy); 1456 1457 static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk) 1458 { 1459 struct sk_filter *fp, *old_fp; 1460 1461 fp = kmalloc(sizeof(*fp), GFP_KERNEL); 1462 if (!fp) 1463 return -ENOMEM; 1464 1465 fp->prog = prog; 1466 1467 if (!__sk_filter_charge(sk, fp)) { 1468 kfree(fp); 1469 return -ENOMEM; 1470 } 1471 refcount_set(&fp->refcnt, 1); 1472 1473 old_fp = rcu_dereference_protected(sk->sk_filter, 1474 lockdep_sock_is_held(sk)); 1475 rcu_assign_pointer(sk->sk_filter, fp); 1476 1477 if (old_fp) 1478 sk_filter_uncharge(sk, old_fp); 1479 1480 return 0; 1481 } 1482 1483 static 1484 struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk) 1485 { 1486 unsigned int fsize = bpf_classic_proglen(fprog); 1487 struct bpf_prog *prog; 1488 int err; 1489 1490 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1491 return ERR_PTR(-EPERM); 1492 1493 /* Make sure new filter is there and in the right amounts. */ 1494 if (!bpf_check_basics_ok(fprog->filter, fprog->len)) 1495 return ERR_PTR(-EINVAL); 1496 1497 prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); 1498 if (!prog) 1499 return ERR_PTR(-ENOMEM); 1500 1501 if (copy_from_user(prog->insns, fprog->filter, fsize)) { 1502 __bpf_prog_free(prog); 1503 return ERR_PTR(-EFAULT); 1504 } 1505 1506 prog->len = fprog->len; 1507 1508 err = bpf_prog_store_orig_filter(prog, fprog); 1509 if (err) { 1510 __bpf_prog_free(prog); 1511 return ERR_PTR(-ENOMEM); 1512 } 1513 1514 /* bpf_prepare_filter() already takes care of freeing 1515 * memory in case something goes wrong. 1516 */ 1517 return bpf_prepare_filter(prog, NULL); 1518 } 1519 1520 /** 1521 * sk_attach_filter - attach a socket filter 1522 * @fprog: the filter program 1523 * @sk: the socket to use 1524 * 1525 * Attach the user's filter code. We first run some sanity checks on 1526 * it to make sure it does not explode on us later. If an error 1527 * occurs or there is insufficient memory for the filter a negative 1528 * errno code is returned. On success the return is zero. 1529 */ 1530 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk) 1531 { 1532 struct bpf_prog *prog = __get_filter(fprog, sk); 1533 int err; 1534 1535 if (IS_ERR(prog)) 1536 return PTR_ERR(prog); 1537 1538 err = __sk_attach_prog(prog, sk); 1539 if (err < 0) { 1540 __bpf_prog_release(prog); 1541 return err; 1542 } 1543 1544 return 0; 1545 } 1546 EXPORT_SYMBOL_GPL(sk_attach_filter); 1547 1548 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk) 1549 { 1550 struct bpf_prog *prog = __get_filter(fprog, sk); 1551 int err; 1552 1553 if (IS_ERR(prog)) 1554 return PTR_ERR(prog); 1555 1556 if (bpf_prog_size(prog->len) > READ_ONCE(sysctl_optmem_max)) 1557 err = -ENOMEM; 1558 else 1559 err = reuseport_attach_prog(sk, prog); 1560 1561 if (err) 1562 __bpf_prog_release(prog); 1563 1564 return err; 1565 } 1566 1567 static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk) 1568 { 1569 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1570 return ERR_PTR(-EPERM); 1571 1572 return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); 1573 } 1574 1575 int sk_attach_bpf(u32 ufd, struct sock *sk) 1576 { 1577 struct bpf_prog *prog = __get_bpf(ufd, sk); 1578 int err; 1579 1580 if (IS_ERR(prog)) 1581 return PTR_ERR(prog); 1582 1583 err = __sk_attach_prog(prog, sk); 1584 if (err < 0) { 1585 bpf_prog_put(prog); 1586 return err; 1587 } 1588 1589 return 0; 1590 } 1591 1592 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk) 1593 { 1594 struct bpf_prog *prog; 1595 int err; 1596 1597 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 1598 return -EPERM; 1599 1600 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); 1601 if (PTR_ERR(prog) == -EINVAL) 1602 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SK_REUSEPORT); 1603 if (IS_ERR(prog)) 1604 return PTR_ERR(prog); 1605 1606 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) { 1607 /* Like other non BPF_PROG_TYPE_SOCKET_FILTER 1608 * bpf prog (e.g. sockmap). It depends on the 1609 * limitation imposed by bpf_prog_load(). 1610 * Hence, sysctl_optmem_max is not checked. 1611 */ 1612 if ((sk->sk_type != SOCK_STREAM && 1613 sk->sk_type != SOCK_DGRAM) || 1614 (sk->sk_protocol != IPPROTO_UDP && 1615 sk->sk_protocol != IPPROTO_TCP) || 1616 (sk->sk_family != AF_INET && 1617 sk->sk_family != AF_INET6)) { 1618 err = -ENOTSUPP; 1619 goto err_prog_put; 1620 } 1621 } else { 1622 /* BPF_PROG_TYPE_SOCKET_FILTER */ 1623 if (bpf_prog_size(prog->len) > READ_ONCE(sysctl_optmem_max)) { 1624 err = -ENOMEM; 1625 goto err_prog_put; 1626 } 1627 } 1628 1629 err = reuseport_attach_prog(sk, prog); 1630 err_prog_put: 1631 if (err) 1632 bpf_prog_put(prog); 1633 1634 return err; 1635 } 1636 1637 void sk_reuseport_prog_free(struct bpf_prog *prog) 1638 { 1639 if (!prog) 1640 return; 1641 1642 if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) 1643 bpf_prog_put(prog); 1644 else 1645 bpf_prog_destroy(prog); 1646 } 1647 1648 struct bpf_scratchpad { 1649 union { 1650 __be32 diff[MAX_BPF_STACK / sizeof(__be32)]; 1651 u8 buff[MAX_BPF_STACK]; 1652 }; 1653 }; 1654 1655 static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp); 1656 1657 static inline int __bpf_try_make_writable(struct sk_buff *skb, 1658 unsigned int write_len) 1659 { 1660 #ifdef CONFIG_DEBUG_NET 1661 /* Avoid a splat in pskb_may_pull_reason() */ 1662 if (write_len > INT_MAX) 1663 return -EINVAL; 1664 #endif 1665 return skb_ensure_writable(skb, write_len); 1666 } 1667 1668 static inline int bpf_try_make_writable(struct sk_buff *skb, 1669 unsigned int write_len) 1670 { 1671 int err = __bpf_try_make_writable(skb, write_len); 1672 1673 bpf_compute_data_pointers(skb); 1674 return err; 1675 } 1676 1677 static int bpf_try_make_head_writable(struct sk_buff *skb) 1678 { 1679 return bpf_try_make_writable(skb, skb_headlen(skb)); 1680 } 1681 1682 static inline void bpf_push_mac_rcsum(struct sk_buff *skb) 1683 { 1684 if (skb_at_tc_ingress(skb)) 1685 skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len); 1686 } 1687 1688 static inline void bpf_pull_mac_rcsum(struct sk_buff *skb) 1689 { 1690 if (skb_at_tc_ingress(skb)) 1691 skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len); 1692 } 1693 1694 BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset, 1695 const void *, from, u32, len, u64, flags) 1696 { 1697 void *ptr; 1698 1699 if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH))) 1700 return -EINVAL; 1701 if (unlikely(offset > INT_MAX)) 1702 return -EFAULT; 1703 if (unlikely(bpf_try_make_writable(skb, offset + len))) 1704 return -EFAULT; 1705 1706 ptr = skb->data + offset; 1707 if (flags & BPF_F_RECOMPUTE_CSUM) 1708 __skb_postpull_rcsum(skb, ptr, len, offset); 1709 1710 memcpy(ptr, from, len); 1711 1712 if (flags & BPF_F_RECOMPUTE_CSUM) 1713 __skb_postpush_rcsum(skb, ptr, len, offset); 1714 if (flags & BPF_F_INVALIDATE_HASH) 1715 skb_clear_hash(skb); 1716 1717 return 0; 1718 } 1719 1720 static const struct bpf_func_proto bpf_skb_store_bytes_proto = { 1721 .func = bpf_skb_store_bytes, 1722 .gpl_only = false, 1723 .ret_type = RET_INTEGER, 1724 .arg1_type = ARG_PTR_TO_CTX, 1725 .arg2_type = ARG_ANYTHING, 1726 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 1727 .arg4_type = ARG_CONST_SIZE, 1728 .arg5_type = ARG_ANYTHING, 1729 }; 1730 1731 int __bpf_skb_store_bytes(struct sk_buff *skb, u32 offset, const void *from, 1732 u32 len, u64 flags) 1733 { 1734 return ____bpf_skb_store_bytes(skb, offset, from, len, flags); 1735 } 1736 1737 BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset, 1738 void *, to, u32, len) 1739 { 1740 void *ptr; 1741 1742 if (unlikely(offset > INT_MAX)) 1743 goto err_clear; 1744 1745 ptr = skb_header_pointer(skb, offset, len, to); 1746 if (unlikely(!ptr)) 1747 goto err_clear; 1748 if (ptr != to) 1749 memcpy(to, ptr, len); 1750 1751 return 0; 1752 err_clear: 1753 memset(to, 0, len); 1754 return -EFAULT; 1755 } 1756 1757 static const struct bpf_func_proto bpf_skb_load_bytes_proto = { 1758 .func = bpf_skb_load_bytes, 1759 .gpl_only = false, 1760 .ret_type = RET_INTEGER, 1761 .arg1_type = ARG_PTR_TO_CTX, 1762 .arg2_type = ARG_ANYTHING, 1763 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1764 .arg4_type = ARG_CONST_SIZE, 1765 }; 1766 1767 int __bpf_skb_load_bytes(const struct sk_buff *skb, u32 offset, void *to, u32 len) 1768 { 1769 return ____bpf_skb_load_bytes(skb, offset, to, len); 1770 } 1771 1772 BPF_CALL_4(bpf_flow_dissector_load_bytes, 1773 const struct bpf_flow_dissector *, ctx, u32, offset, 1774 void *, to, u32, len) 1775 { 1776 void *ptr; 1777 1778 if (unlikely(offset > 0xffff)) 1779 goto err_clear; 1780 1781 if (unlikely(!ctx->skb)) 1782 goto err_clear; 1783 1784 ptr = skb_header_pointer(ctx->skb, offset, len, to); 1785 if (unlikely(!ptr)) 1786 goto err_clear; 1787 if (ptr != to) 1788 memcpy(to, ptr, len); 1789 1790 return 0; 1791 err_clear: 1792 memset(to, 0, len); 1793 return -EFAULT; 1794 } 1795 1796 static const struct bpf_func_proto bpf_flow_dissector_load_bytes_proto = { 1797 .func = bpf_flow_dissector_load_bytes, 1798 .gpl_only = false, 1799 .ret_type = RET_INTEGER, 1800 .arg1_type = ARG_PTR_TO_CTX, 1801 .arg2_type = ARG_ANYTHING, 1802 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1803 .arg4_type = ARG_CONST_SIZE, 1804 }; 1805 1806 BPF_CALL_5(bpf_skb_load_bytes_relative, const struct sk_buff *, skb, 1807 u32, offset, void *, to, u32, len, u32, start_header) 1808 { 1809 u8 *end = skb_tail_pointer(skb); 1810 u8 *start, *ptr; 1811 1812 if (unlikely(offset > 0xffff)) 1813 goto err_clear; 1814 1815 switch (start_header) { 1816 case BPF_HDR_START_MAC: 1817 if (unlikely(!skb_mac_header_was_set(skb))) 1818 goto err_clear; 1819 start = skb_mac_header(skb); 1820 break; 1821 case BPF_HDR_START_NET: 1822 start = skb_network_header(skb); 1823 break; 1824 default: 1825 goto err_clear; 1826 } 1827 1828 ptr = start + offset; 1829 1830 if (likely(ptr + len <= end)) { 1831 memcpy(to, ptr, len); 1832 return 0; 1833 } 1834 1835 err_clear: 1836 memset(to, 0, len); 1837 return -EFAULT; 1838 } 1839 1840 static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto = { 1841 .func = bpf_skb_load_bytes_relative, 1842 .gpl_only = false, 1843 .ret_type = RET_INTEGER, 1844 .arg1_type = ARG_PTR_TO_CTX, 1845 .arg2_type = ARG_ANYTHING, 1846 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 1847 .arg4_type = ARG_CONST_SIZE, 1848 .arg5_type = ARG_ANYTHING, 1849 }; 1850 1851 BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len) 1852 { 1853 /* Idea is the following: should the needed direct read/write 1854 * test fail during runtime, we can pull in more data and redo 1855 * again, since implicitly, we invalidate previous checks here. 1856 * 1857 * Or, since we know how much we need to make read/writeable, 1858 * this can be done once at the program beginning for direct 1859 * access case. By this we overcome limitations of only current 1860 * headroom being accessible. 1861 */ 1862 return bpf_try_make_writable(skb, len ? : skb_headlen(skb)); 1863 } 1864 1865 static const struct bpf_func_proto bpf_skb_pull_data_proto = { 1866 .func = bpf_skb_pull_data, 1867 .gpl_only = false, 1868 .ret_type = RET_INTEGER, 1869 .arg1_type = ARG_PTR_TO_CTX, 1870 .arg2_type = ARG_ANYTHING, 1871 }; 1872 1873 BPF_CALL_1(bpf_sk_fullsock, struct sock *, sk) 1874 { 1875 return sk_fullsock(sk) ? (unsigned long)sk : (unsigned long)NULL; 1876 } 1877 1878 static const struct bpf_func_proto bpf_sk_fullsock_proto = { 1879 .func = bpf_sk_fullsock, 1880 .gpl_only = false, 1881 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 1882 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 1883 }; 1884 1885 static inline int sk_skb_try_make_writable(struct sk_buff *skb, 1886 unsigned int write_len) 1887 { 1888 return __bpf_try_make_writable(skb, write_len); 1889 } 1890 1891 BPF_CALL_2(sk_skb_pull_data, struct sk_buff *, skb, u32, len) 1892 { 1893 /* Idea is the following: should the needed direct read/write 1894 * test fail during runtime, we can pull in more data and redo 1895 * again, since implicitly, we invalidate previous checks here. 1896 * 1897 * Or, since we know how much we need to make read/writeable, 1898 * this can be done once at the program beginning for direct 1899 * access case. By this we overcome limitations of only current 1900 * headroom being accessible. 1901 */ 1902 return sk_skb_try_make_writable(skb, len ? : skb_headlen(skb)); 1903 } 1904 1905 static const struct bpf_func_proto sk_skb_pull_data_proto = { 1906 .func = sk_skb_pull_data, 1907 .gpl_only = false, 1908 .ret_type = RET_INTEGER, 1909 .arg1_type = ARG_PTR_TO_CTX, 1910 .arg2_type = ARG_ANYTHING, 1911 }; 1912 1913 BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset, 1914 u64, from, u64, to, u64, flags) 1915 { 1916 __sum16 *ptr; 1917 1918 if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK))) 1919 return -EINVAL; 1920 if (unlikely(offset > 0xffff || offset & 1)) 1921 return -EFAULT; 1922 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) 1923 return -EFAULT; 1924 1925 ptr = (__sum16 *)(skb->data + offset); 1926 switch (flags & BPF_F_HDR_FIELD_MASK) { 1927 case 0: 1928 if (unlikely(from != 0)) 1929 return -EINVAL; 1930 1931 csum_replace_by_diff(ptr, to); 1932 break; 1933 case 2: 1934 csum_replace2(ptr, from, to); 1935 break; 1936 case 4: 1937 csum_replace4(ptr, from, to); 1938 break; 1939 default: 1940 return -EINVAL; 1941 } 1942 1943 return 0; 1944 } 1945 1946 static const struct bpf_func_proto bpf_l3_csum_replace_proto = { 1947 .func = bpf_l3_csum_replace, 1948 .gpl_only = false, 1949 .ret_type = RET_INTEGER, 1950 .arg1_type = ARG_PTR_TO_CTX, 1951 .arg2_type = ARG_ANYTHING, 1952 .arg3_type = ARG_ANYTHING, 1953 .arg4_type = ARG_ANYTHING, 1954 .arg5_type = ARG_ANYTHING, 1955 }; 1956 1957 BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset, 1958 u64, from, u64, to, u64, flags) 1959 { 1960 bool is_pseudo = flags & BPF_F_PSEUDO_HDR; 1961 bool is_mmzero = flags & BPF_F_MARK_MANGLED_0; 1962 bool do_mforce = flags & BPF_F_MARK_ENFORCE; 1963 __sum16 *ptr; 1964 1965 if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE | 1966 BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK))) 1967 return -EINVAL; 1968 if (unlikely(offset > 0xffff || offset & 1)) 1969 return -EFAULT; 1970 if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) 1971 return -EFAULT; 1972 1973 ptr = (__sum16 *)(skb->data + offset); 1974 if (is_mmzero && !do_mforce && !*ptr) 1975 return 0; 1976 1977 switch (flags & BPF_F_HDR_FIELD_MASK) { 1978 case 0: 1979 if (unlikely(from != 0)) 1980 return -EINVAL; 1981 1982 inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo); 1983 break; 1984 case 2: 1985 inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo); 1986 break; 1987 case 4: 1988 inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo); 1989 break; 1990 default: 1991 return -EINVAL; 1992 } 1993 1994 if (is_mmzero && !*ptr) 1995 *ptr = CSUM_MANGLED_0; 1996 return 0; 1997 } 1998 1999 static const struct bpf_func_proto bpf_l4_csum_replace_proto = { 2000 .func = bpf_l4_csum_replace, 2001 .gpl_only = false, 2002 .ret_type = RET_INTEGER, 2003 .arg1_type = ARG_PTR_TO_CTX, 2004 .arg2_type = ARG_ANYTHING, 2005 .arg3_type = ARG_ANYTHING, 2006 .arg4_type = ARG_ANYTHING, 2007 .arg5_type = ARG_ANYTHING, 2008 }; 2009 2010 BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size, 2011 __be32 *, to, u32, to_size, __wsum, seed) 2012 { 2013 struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp); 2014 u32 diff_size = from_size + to_size; 2015 int i, j = 0; 2016 2017 /* This is quite flexible, some examples: 2018 * 2019 * from_size == 0, to_size > 0, seed := csum --> pushing data 2020 * from_size > 0, to_size == 0, seed := csum --> pulling data 2021 * from_size > 0, to_size > 0, seed := 0 --> diffing data 2022 * 2023 * Even for diffing, from_size and to_size don't need to be equal. 2024 */ 2025 if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) || 2026 diff_size > sizeof(sp->diff))) 2027 return -EINVAL; 2028 2029 for (i = 0; i < from_size / sizeof(__be32); i++, j++) 2030 sp->diff[j] = ~from[i]; 2031 for (i = 0; i < to_size / sizeof(__be32); i++, j++) 2032 sp->diff[j] = to[i]; 2033 2034 return csum_partial(sp->diff, diff_size, seed); 2035 } 2036 2037 static const struct bpf_func_proto bpf_csum_diff_proto = { 2038 .func = bpf_csum_diff, 2039 .gpl_only = false, 2040 .pkt_access = true, 2041 .ret_type = RET_INTEGER, 2042 .arg1_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY, 2043 .arg2_type = ARG_CONST_SIZE_OR_ZERO, 2044 .arg3_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY, 2045 .arg4_type = ARG_CONST_SIZE_OR_ZERO, 2046 .arg5_type = ARG_ANYTHING, 2047 }; 2048 2049 BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum) 2050 { 2051 /* The interface is to be used in combination with bpf_csum_diff() 2052 * for direct packet writes. csum rotation for alignment as well 2053 * as emulating csum_sub() can be done from the eBPF program. 2054 */ 2055 if (skb->ip_summed == CHECKSUM_COMPLETE) 2056 return (skb->csum = csum_add(skb->csum, csum)); 2057 2058 return -ENOTSUPP; 2059 } 2060 2061 static const struct bpf_func_proto bpf_csum_update_proto = { 2062 .func = bpf_csum_update, 2063 .gpl_only = false, 2064 .ret_type = RET_INTEGER, 2065 .arg1_type = ARG_PTR_TO_CTX, 2066 .arg2_type = ARG_ANYTHING, 2067 }; 2068 2069 BPF_CALL_2(bpf_csum_level, struct sk_buff *, skb, u64, level) 2070 { 2071 /* The interface is to be used in combination with bpf_skb_adjust_room() 2072 * for encap/decap of packet headers when BPF_F_ADJ_ROOM_NO_CSUM_RESET 2073 * is passed as flags, for example. 2074 */ 2075 switch (level) { 2076 case BPF_CSUM_LEVEL_INC: 2077 __skb_incr_checksum_unnecessary(skb); 2078 break; 2079 case BPF_CSUM_LEVEL_DEC: 2080 __skb_decr_checksum_unnecessary(skb); 2081 break; 2082 case BPF_CSUM_LEVEL_RESET: 2083 __skb_reset_checksum_unnecessary(skb); 2084 break; 2085 case BPF_CSUM_LEVEL_QUERY: 2086 return skb->ip_summed == CHECKSUM_UNNECESSARY ? 2087 skb->csum_level : -EACCES; 2088 default: 2089 return -EINVAL; 2090 } 2091 2092 return 0; 2093 } 2094 2095 static const struct bpf_func_proto bpf_csum_level_proto = { 2096 .func = bpf_csum_level, 2097 .gpl_only = false, 2098 .ret_type = RET_INTEGER, 2099 .arg1_type = ARG_PTR_TO_CTX, 2100 .arg2_type = ARG_ANYTHING, 2101 }; 2102 2103 static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb) 2104 { 2105 return dev_forward_skb_nomtu(dev, skb); 2106 } 2107 2108 static inline int __bpf_rx_skb_no_mac(struct net_device *dev, 2109 struct sk_buff *skb) 2110 { 2111 int ret = ____dev_forward_skb(dev, skb, false); 2112 2113 if (likely(!ret)) { 2114 skb->dev = dev; 2115 ret = netif_rx(skb); 2116 } 2117 2118 return ret; 2119 } 2120 2121 static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb) 2122 { 2123 int ret; 2124 2125 if (dev_xmit_recursion()) { 2126 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); 2127 kfree_skb(skb); 2128 return -ENETDOWN; 2129 } 2130 2131 skb->dev = dev; 2132 skb_set_redirected_noclear(skb, skb_at_tc_ingress(skb)); 2133 skb_clear_tstamp(skb); 2134 2135 dev_xmit_recursion_inc(); 2136 ret = dev_queue_xmit(skb); 2137 dev_xmit_recursion_dec(); 2138 2139 return ret; 2140 } 2141 2142 static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev, 2143 u32 flags) 2144 { 2145 unsigned int mlen = skb_network_offset(skb); 2146 2147 if (unlikely(skb->len <= mlen)) { 2148 kfree_skb(skb); 2149 return -ERANGE; 2150 } 2151 2152 if (mlen) { 2153 __skb_pull(skb, mlen); 2154 2155 /* At ingress, the mac header has already been pulled once. 2156 * At egress, skb_pospull_rcsum has to be done in case that 2157 * the skb is originated from ingress (i.e. a forwarded skb) 2158 * to ensure that rcsum starts at net header. 2159 */ 2160 if (!skb_at_tc_ingress(skb)) 2161 skb_postpull_rcsum(skb, skb_mac_header(skb), mlen); 2162 } 2163 skb_pop_mac_header(skb); 2164 skb_reset_mac_len(skb); 2165 return flags & BPF_F_INGRESS ? 2166 __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb); 2167 } 2168 2169 static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev, 2170 u32 flags) 2171 { 2172 /* Verify that a link layer header is carried */ 2173 if (unlikely(skb->mac_header >= skb->network_header || skb->len == 0)) { 2174 kfree_skb(skb); 2175 return -ERANGE; 2176 } 2177 2178 bpf_push_mac_rcsum(skb); 2179 return flags & BPF_F_INGRESS ? 2180 __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb); 2181 } 2182 2183 static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev, 2184 u32 flags) 2185 { 2186 if (dev_is_mac_header_xmit(dev)) 2187 return __bpf_redirect_common(skb, dev, flags); 2188 else 2189 return __bpf_redirect_no_mac(skb, dev, flags); 2190 } 2191 2192 #if IS_ENABLED(CONFIG_IPV6) 2193 static int bpf_out_neigh_v6(struct net *net, struct sk_buff *skb, 2194 struct net_device *dev, struct bpf_nh_params *nh) 2195 { 2196 u32 hh_len = LL_RESERVED_SPACE(dev); 2197 const struct in6_addr *nexthop; 2198 struct dst_entry *dst = NULL; 2199 struct neighbour *neigh; 2200 2201 if (dev_xmit_recursion()) { 2202 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); 2203 goto out_drop; 2204 } 2205 2206 skb->dev = dev; 2207 skb_clear_tstamp(skb); 2208 2209 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { 2210 skb = skb_expand_head(skb, hh_len); 2211 if (!skb) 2212 return -ENOMEM; 2213 } 2214 2215 rcu_read_lock(); 2216 if (!nh) { 2217 dst = skb_dst(skb); 2218 nexthop = rt6_nexthop(container_of(dst, struct rt6_info, dst), 2219 &ipv6_hdr(skb)->daddr); 2220 } else { 2221 nexthop = &nh->ipv6_nh; 2222 } 2223 neigh = ip_neigh_gw6(dev, nexthop); 2224 if (likely(!IS_ERR(neigh))) { 2225 int ret; 2226 2227 sock_confirm_neigh(skb, neigh); 2228 local_bh_disable(); 2229 dev_xmit_recursion_inc(); 2230 ret = neigh_output(neigh, skb, false); 2231 dev_xmit_recursion_dec(); 2232 local_bh_enable(); 2233 rcu_read_unlock(); 2234 return ret; 2235 } 2236 rcu_read_unlock_bh(); 2237 if (dst) 2238 IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); 2239 out_drop: 2240 kfree_skb(skb); 2241 return -ENETDOWN; 2242 } 2243 2244 static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev, 2245 struct bpf_nh_params *nh) 2246 { 2247 const struct ipv6hdr *ip6h = ipv6_hdr(skb); 2248 struct net *net = dev_net(dev); 2249 int err, ret = NET_XMIT_DROP; 2250 2251 if (!nh) { 2252 struct dst_entry *dst; 2253 struct flowi6 fl6 = { 2254 .flowi6_flags = FLOWI_FLAG_ANYSRC, 2255 .flowi6_mark = skb->mark, 2256 .flowlabel = ip6_flowinfo(ip6h), 2257 .flowi6_oif = dev->ifindex, 2258 .flowi6_proto = ip6h->nexthdr, 2259 .daddr = ip6h->daddr, 2260 .saddr = ip6h->saddr, 2261 }; 2262 2263 dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL); 2264 if (IS_ERR(dst)) 2265 goto out_drop; 2266 2267 skb_dst_set(skb, dst); 2268 } else if (nh->nh_family != AF_INET6) { 2269 goto out_drop; 2270 } 2271 2272 err = bpf_out_neigh_v6(net, skb, dev, nh); 2273 if (unlikely(net_xmit_eval(err))) 2274 dev->stats.tx_errors++; 2275 else 2276 ret = NET_XMIT_SUCCESS; 2277 goto out_xmit; 2278 out_drop: 2279 dev->stats.tx_errors++; 2280 kfree_skb(skb); 2281 out_xmit: 2282 return ret; 2283 } 2284 #else 2285 static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev, 2286 struct bpf_nh_params *nh) 2287 { 2288 kfree_skb(skb); 2289 return NET_XMIT_DROP; 2290 } 2291 #endif /* CONFIG_IPV6 */ 2292 2293 #if IS_ENABLED(CONFIG_INET) 2294 static int bpf_out_neigh_v4(struct net *net, struct sk_buff *skb, 2295 struct net_device *dev, struct bpf_nh_params *nh) 2296 { 2297 u32 hh_len = LL_RESERVED_SPACE(dev); 2298 struct neighbour *neigh; 2299 bool is_v6gw = false; 2300 2301 if (dev_xmit_recursion()) { 2302 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); 2303 goto out_drop; 2304 } 2305 2306 skb->dev = dev; 2307 skb_clear_tstamp(skb); 2308 2309 if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { 2310 skb = skb_expand_head(skb, hh_len); 2311 if (!skb) 2312 return -ENOMEM; 2313 } 2314 2315 rcu_read_lock(); 2316 if (!nh) { 2317 struct dst_entry *dst = skb_dst(skb); 2318 struct rtable *rt = container_of(dst, struct rtable, dst); 2319 2320 neigh = ip_neigh_for_gw(rt, skb, &is_v6gw); 2321 } else if (nh->nh_family == AF_INET6) { 2322 neigh = ip_neigh_gw6(dev, &nh->ipv6_nh); 2323 is_v6gw = true; 2324 } else if (nh->nh_family == AF_INET) { 2325 neigh = ip_neigh_gw4(dev, nh->ipv4_nh); 2326 } else { 2327 rcu_read_unlock(); 2328 goto out_drop; 2329 } 2330 2331 if (likely(!IS_ERR(neigh))) { 2332 int ret; 2333 2334 sock_confirm_neigh(skb, neigh); 2335 local_bh_disable(); 2336 dev_xmit_recursion_inc(); 2337 ret = neigh_output(neigh, skb, is_v6gw); 2338 dev_xmit_recursion_dec(); 2339 local_bh_enable(); 2340 rcu_read_unlock(); 2341 return ret; 2342 } 2343 rcu_read_unlock(); 2344 out_drop: 2345 kfree_skb(skb); 2346 return -ENETDOWN; 2347 } 2348 2349 static int __bpf_redirect_neigh_v4(struct sk_buff *skb, struct net_device *dev, 2350 struct bpf_nh_params *nh) 2351 { 2352 const struct iphdr *ip4h = ip_hdr(skb); 2353 struct net *net = dev_net(dev); 2354 int err, ret = NET_XMIT_DROP; 2355 2356 if (!nh) { 2357 struct flowi4 fl4 = { 2358 .flowi4_flags = FLOWI_FLAG_ANYSRC, 2359 .flowi4_mark = skb->mark, 2360 .flowi4_tos = RT_TOS(ip4h->tos), 2361 .flowi4_oif = dev->ifindex, 2362 .flowi4_proto = ip4h->protocol, 2363 .daddr = ip4h->daddr, 2364 .saddr = ip4h->saddr, 2365 }; 2366 struct rtable *rt; 2367 2368 rt = ip_route_output_flow(net, &fl4, NULL); 2369 if (IS_ERR(rt)) 2370 goto out_drop; 2371 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { 2372 ip_rt_put(rt); 2373 goto out_drop; 2374 } 2375 2376 skb_dst_set(skb, &rt->dst); 2377 } 2378 2379 err = bpf_out_neigh_v4(net, skb, dev, nh); 2380 if (unlikely(net_xmit_eval(err))) 2381 dev->stats.tx_errors++; 2382 else 2383 ret = NET_XMIT_SUCCESS; 2384 goto out_xmit; 2385 out_drop: 2386 dev->stats.tx_errors++; 2387 kfree_skb(skb); 2388 out_xmit: 2389 return ret; 2390 } 2391 #else 2392 static int __bpf_redirect_neigh_v4(struct sk_buff *skb, struct net_device *dev, 2393 struct bpf_nh_params *nh) 2394 { 2395 kfree_skb(skb); 2396 return NET_XMIT_DROP; 2397 } 2398 #endif /* CONFIG_INET */ 2399 2400 static int __bpf_redirect_neigh(struct sk_buff *skb, struct net_device *dev, 2401 struct bpf_nh_params *nh) 2402 { 2403 struct ethhdr *ethh = eth_hdr(skb); 2404 2405 if (unlikely(skb->mac_header >= skb->network_header)) 2406 goto out; 2407 bpf_push_mac_rcsum(skb); 2408 if (is_multicast_ether_addr(ethh->h_dest)) 2409 goto out; 2410 2411 skb_pull(skb, sizeof(*ethh)); 2412 skb_unset_mac_header(skb); 2413 skb_reset_network_header(skb); 2414 2415 if (skb->protocol == htons(ETH_P_IP)) 2416 return __bpf_redirect_neigh_v4(skb, dev, nh); 2417 else if (skb->protocol == htons(ETH_P_IPV6)) 2418 return __bpf_redirect_neigh_v6(skb, dev, nh); 2419 out: 2420 kfree_skb(skb); 2421 return -ENOTSUPP; 2422 } 2423 2424 /* Internal, non-exposed redirect flags. */ 2425 enum { 2426 BPF_F_NEIGH = (1ULL << 1), 2427 BPF_F_PEER = (1ULL << 2), 2428 BPF_F_NEXTHOP = (1ULL << 3), 2429 #define BPF_F_REDIRECT_INTERNAL (BPF_F_NEIGH | BPF_F_PEER | BPF_F_NEXTHOP) 2430 }; 2431 2432 BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags) 2433 { 2434 struct net_device *dev; 2435 struct sk_buff *clone; 2436 int ret; 2437 2438 if (unlikely(flags & (~(BPF_F_INGRESS) | BPF_F_REDIRECT_INTERNAL))) 2439 return -EINVAL; 2440 2441 dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex); 2442 if (unlikely(!dev)) 2443 return -EINVAL; 2444 2445 clone = skb_clone(skb, GFP_ATOMIC); 2446 if (unlikely(!clone)) 2447 return -ENOMEM; 2448 2449 /* For direct write, we need to keep the invariant that the skbs 2450 * we're dealing with need to be uncloned. Should uncloning fail 2451 * here, we need to free the just generated clone to unclone once 2452 * again. 2453 */ 2454 ret = bpf_try_make_head_writable(skb); 2455 if (unlikely(ret)) { 2456 kfree_skb(clone); 2457 return -ENOMEM; 2458 } 2459 2460 return __bpf_redirect(clone, dev, flags); 2461 } 2462 2463 static const struct bpf_func_proto bpf_clone_redirect_proto = { 2464 .func = bpf_clone_redirect, 2465 .gpl_only = false, 2466 .ret_type = RET_INTEGER, 2467 .arg1_type = ARG_PTR_TO_CTX, 2468 .arg2_type = ARG_ANYTHING, 2469 .arg3_type = ARG_ANYTHING, 2470 }; 2471 2472 DEFINE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info); 2473 EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info); 2474 2475 int skb_do_redirect(struct sk_buff *skb) 2476 { 2477 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2478 struct net *net = dev_net(skb->dev); 2479 struct net_device *dev; 2480 u32 flags = ri->flags; 2481 2482 dev = dev_get_by_index_rcu(net, ri->tgt_index); 2483 ri->tgt_index = 0; 2484 ri->flags = 0; 2485 if (unlikely(!dev)) 2486 goto out_drop; 2487 if (flags & BPF_F_PEER) { 2488 const struct net_device_ops *ops = dev->netdev_ops; 2489 2490 if (unlikely(!ops->ndo_get_peer_dev || 2491 !skb_at_tc_ingress(skb))) 2492 goto out_drop; 2493 dev = ops->ndo_get_peer_dev(dev); 2494 if (unlikely(!dev || 2495 !(dev->flags & IFF_UP) || 2496 net_eq(net, dev_net(dev)))) 2497 goto out_drop; 2498 skb->dev = dev; 2499 dev_sw_netstats_rx_add(dev, skb->len); 2500 return -EAGAIN; 2501 } 2502 return flags & BPF_F_NEIGH ? 2503 __bpf_redirect_neigh(skb, dev, flags & BPF_F_NEXTHOP ? 2504 &ri->nh : NULL) : 2505 __bpf_redirect(skb, dev, flags); 2506 out_drop: 2507 kfree_skb(skb); 2508 return -EINVAL; 2509 } 2510 2511 BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags) 2512 { 2513 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2514 2515 if (unlikely(flags & (~(BPF_F_INGRESS) | BPF_F_REDIRECT_INTERNAL))) 2516 return TC_ACT_SHOT; 2517 2518 ri->flags = flags; 2519 ri->tgt_index = ifindex; 2520 2521 return TC_ACT_REDIRECT; 2522 } 2523 2524 static const struct bpf_func_proto bpf_redirect_proto = { 2525 .func = bpf_redirect, 2526 .gpl_only = false, 2527 .ret_type = RET_INTEGER, 2528 .arg1_type = ARG_ANYTHING, 2529 .arg2_type = ARG_ANYTHING, 2530 }; 2531 2532 BPF_CALL_2(bpf_redirect_peer, u32, ifindex, u64, flags) 2533 { 2534 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2535 2536 if (unlikely(flags)) 2537 return TC_ACT_SHOT; 2538 2539 ri->flags = BPF_F_PEER; 2540 ri->tgt_index = ifindex; 2541 2542 return TC_ACT_REDIRECT; 2543 } 2544 2545 static const struct bpf_func_proto bpf_redirect_peer_proto = { 2546 .func = bpf_redirect_peer, 2547 .gpl_only = false, 2548 .ret_type = RET_INTEGER, 2549 .arg1_type = ARG_ANYTHING, 2550 .arg2_type = ARG_ANYTHING, 2551 }; 2552 2553 BPF_CALL_4(bpf_redirect_neigh, u32, ifindex, struct bpf_redir_neigh *, params, 2554 int, plen, u64, flags) 2555 { 2556 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 2557 2558 if (unlikely((plen && plen < sizeof(*params)) || flags)) 2559 return TC_ACT_SHOT; 2560 2561 ri->flags = BPF_F_NEIGH | (plen ? BPF_F_NEXTHOP : 0); 2562 ri->tgt_index = ifindex; 2563 2564 BUILD_BUG_ON(sizeof(struct bpf_redir_neigh) != sizeof(struct bpf_nh_params)); 2565 if (plen) 2566 memcpy(&ri->nh, params, sizeof(ri->nh)); 2567 2568 return TC_ACT_REDIRECT; 2569 } 2570 2571 static const struct bpf_func_proto bpf_redirect_neigh_proto = { 2572 .func = bpf_redirect_neigh, 2573 .gpl_only = false, 2574 .ret_type = RET_INTEGER, 2575 .arg1_type = ARG_ANYTHING, 2576 .arg2_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY, 2577 .arg3_type = ARG_CONST_SIZE_OR_ZERO, 2578 .arg4_type = ARG_ANYTHING, 2579 }; 2580 2581 BPF_CALL_2(bpf_msg_apply_bytes, struct sk_msg *, msg, u32, bytes) 2582 { 2583 msg->apply_bytes = bytes; 2584 return 0; 2585 } 2586 2587 static const struct bpf_func_proto bpf_msg_apply_bytes_proto = { 2588 .func = bpf_msg_apply_bytes, 2589 .gpl_only = false, 2590 .ret_type = RET_INTEGER, 2591 .arg1_type = ARG_PTR_TO_CTX, 2592 .arg2_type = ARG_ANYTHING, 2593 }; 2594 2595 BPF_CALL_2(bpf_msg_cork_bytes, struct sk_msg *, msg, u32, bytes) 2596 { 2597 msg->cork_bytes = bytes; 2598 return 0; 2599 } 2600 2601 static void sk_msg_reset_curr(struct sk_msg *msg) 2602 { 2603 u32 i = msg->sg.start; 2604 u32 len = 0; 2605 2606 do { 2607 len += sk_msg_elem(msg, i)->length; 2608 sk_msg_iter_var_next(i); 2609 if (len >= msg->sg.size) 2610 break; 2611 } while (i != msg->sg.end); 2612 2613 msg->sg.curr = i; 2614 msg->sg.copybreak = 0; 2615 } 2616 2617 static const struct bpf_func_proto bpf_msg_cork_bytes_proto = { 2618 .func = bpf_msg_cork_bytes, 2619 .gpl_only = false, 2620 .ret_type = RET_INTEGER, 2621 .arg1_type = ARG_PTR_TO_CTX, 2622 .arg2_type = ARG_ANYTHING, 2623 }; 2624 2625 BPF_CALL_4(bpf_msg_pull_data, struct sk_msg *, msg, u32, start, 2626 u32, end, u64, flags) 2627 { 2628 u32 len = 0, offset = 0, copy = 0, poffset = 0, bytes = end - start; 2629 u32 first_sge, last_sge, i, shift, bytes_sg_total; 2630 struct scatterlist *sge; 2631 u8 *raw, *to, *from; 2632 struct page *page; 2633 2634 if (unlikely(flags || end <= start)) 2635 return -EINVAL; 2636 2637 /* First find the starting scatterlist element */ 2638 i = msg->sg.start; 2639 do { 2640 offset += len; 2641 len = sk_msg_elem(msg, i)->length; 2642 if (start < offset + len) 2643 break; 2644 sk_msg_iter_var_next(i); 2645 } while (i != msg->sg.end); 2646 2647 if (unlikely(start >= offset + len)) 2648 return -EINVAL; 2649 2650 first_sge = i; 2651 /* The start may point into the sg element so we need to also 2652 * account for the headroom. 2653 */ 2654 bytes_sg_total = start - offset + bytes; 2655 if (!test_bit(i, msg->sg.copy) && bytes_sg_total <= len) 2656 goto out; 2657 2658 /* At this point we need to linearize multiple scatterlist 2659 * elements or a single shared page. Either way we need to 2660 * copy into a linear buffer exclusively owned by BPF. Then 2661 * place the buffer in the scatterlist and fixup the original 2662 * entries by removing the entries now in the linear buffer 2663 * and shifting the remaining entries. For now we do not try 2664 * to copy partial entries to avoid complexity of running out 2665 * of sg_entry slots. The downside is reading a single byte 2666 * will copy the entire sg entry. 2667 */ 2668 do { 2669 copy += sk_msg_elem(msg, i)->length; 2670 sk_msg_iter_var_next(i); 2671 if (bytes_sg_total <= copy) 2672 break; 2673 } while (i != msg->sg.end); 2674 last_sge = i; 2675 2676 if (unlikely(bytes_sg_total > copy)) 2677 return -EINVAL; 2678 2679 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, 2680 get_order(copy)); 2681 if (unlikely(!page)) 2682 return -ENOMEM; 2683 2684 raw = page_address(page); 2685 i = first_sge; 2686 do { 2687 sge = sk_msg_elem(msg, i); 2688 from = sg_virt(sge); 2689 len = sge->length; 2690 to = raw + poffset; 2691 2692 memcpy(to, from, len); 2693 poffset += len; 2694 sge->length = 0; 2695 put_page(sg_page(sge)); 2696 2697 sk_msg_iter_var_next(i); 2698 } while (i != last_sge); 2699 2700 sg_set_page(&msg->sg.data[first_sge], page, copy, 0); 2701 2702 /* To repair sg ring we need to shift entries. If we only 2703 * had a single entry though we can just replace it and 2704 * be done. Otherwise walk the ring and shift the entries. 2705 */ 2706 WARN_ON_ONCE(last_sge == first_sge); 2707 shift = last_sge > first_sge ? 2708 last_sge - first_sge - 1 : 2709 NR_MSG_FRAG_IDS - first_sge + last_sge - 1; 2710 if (!shift) 2711 goto out; 2712 2713 i = first_sge; 2714 sk_msg_iter_var_next(i); 2715 do { 2716 u32 move_from; 2717 2718 if (i + shift >= NR_MSG_FRAG_IDS) 2719 move_from = i + shift - NR_MSG_FRAG_IDS; 2720 else 2721 move_from = i + shift; 2722 if (move_from == msg->sg.end) 2723 break; 2724 2725 msg->sg.data[i] = msg->sg.data[move_from]; 2726 msg->sg.data[move_from].length = 0; 2727 msg->sg.data[move_from].page_link = 0; 2728 msg->sg.data[move_from].offset = 0; 2729 sk_msg_iter_var_next(i); 2730 } while (1); 2731 2732 msg->sg.end = msg->sg.end - shift > msg->sg.end ? 2733 msg->sg.end - shift + NR_MSG_FRAG_IDS : 2734 msg->sg.end - shift; 2735 out: 2736 sk_msg_reset_curr(msg); 2737 msg->data = sg_virt(&msg->sg.data[first_sge]) + start - offset; 2738 msg->data_end = msg->data + bytes; 2739 return 0; 2740 } 2741 2742 static const struct bpf_func_proto bpf_msg_pull_data_proto = { 2743 .func = bpf_msg_pull_data, 2744 .gpl_only = false, 2745 .ret_type = RET_INTEGER, 2746 .arg1_type = ARG_PTR_TO_CTX, 2747 .arg2_type = ARG_ANYTHING, 2748 .arg3_type = ARG_ANYTHING, 2749 .arg4_type = ARG_ANYTHING, 2750 }; 2751 2752 BPF_CALL_4(bpf_msg_push_data, struct sk_msg *, msg, u32, start, 2753 u32, len, u64, flags) 2754 { 2755 struct scatterlist sge, nsge, nnsge, rsge = {0}, *psge; 2756 u32 new, i = 0, l = 0, space, copy = 0, offset = 0; 2757 u8 *raw, *to, *from; 2758 struct page *page; 2759 2760 if (unlikely(flags)) 2761 return -EINVAL; 2762 2763 if (unlikely(len == 0)) 2764 return 0; 2765 2766 /* First find the starting scatterlist element */ 2767 i = msg->sg.start; 2768 do { 2769 offset += l; 2770 l = sk_msg_elem(msg, i)->length; 2771 2772 if (start < offset + l) 2773 break; 2774 sk_msg_iter_var_next(i); 2775 } while (i != msg->sg.end); 2776 2777 if (start >= offset + l) 2778 return -EINVAL; 2779 2780 space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); 2781 2782 /* If no space available will fallback to copy, we need at 2783 * least one scatterlist elem available to push data into 2784 * when start aligns to the beginning of an element or two 2785 * when it falls inside an element. We handle the start equals 2786 * offset case because its the common case for inserting a 2787 * header. 2788 */ 2789 if (!space || (space == 1 && start != offset)) 2790 copy = msg->sg.data[i].length; 2791 2792 page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, 2793 get_order(copy + len)); 2794 if (unlikely(!page)) 2795 return -ENOMEM; 2796 2797 if (copy) { 2798 int front, back; 2799 2800 raw = page_address(page); 2801 2802 psge = sk_msg_elem(msg, i); 2803 front = start - offset; 2804 back = psge->length - front; 2805 from = sg_virt(psge); 2806 2807 if (front) 2808 memcpy(raw, from, front); 2809 2810 if (back) { 2811 from += front; 2812 to = raw + front + len; 2813 2814 memcpy(to, from, back); 2815 } 2816 2817 put_page(sg_page(psge)); 2818 } else if (start - offset) { 2819 psge = sk_msg_elem(msg, i); 2820 rsge = sk_msg_elem_cpy(msg, i); 2821 2822 psge->length = start - offset; 2823 rsge.length -= psge->length; 2824 rsge.offset += start; 2825 2826 sk_msg_iter_var_next(i); 2827 sg_unmark_end(psge); 2828 sg_unmark_end(&rsge); 2829 sk_msg_iter_next(msg, end); 2830 } 2831 2832 /* Slot(s) to place newly allocated data */ 2833 new = i; 2834 2835 /* Shift one or two slots as needed */ 2836 if (!copy) { 2837 sge = sk_msg_elem_cpy(msg, i); 2838 2839 sk_msg_iter_var_next(i); 2840 sg_unmark_end(&sge); 2841 sk_msg_iter_next(msg, end); 2842 2843 nsge = sk_msg_elem_cpy(msg, i); 2844 if (rsge.length) { 2845 sk_msg_iter_var_next(i); 2846 nnsge = sk_msg_elem_cpy(msg, i); 2847 } 2848 2849 while (i != msg->sg.end) { 2850 msg->sg.data[i] = sge; 2851 sge = nsge; 2852 sk_msg_iter_var_next(i); 2853 if (rsge.length) { 2854 nsge = nnsge; 2855 nnsge = sk_msg_elem_cpy(msg, i); 2856 } else { 2857 nsge = sk_msg_elem_cpy(msg, i); 2858 } 2859 } 2860 } 2861 2862 /* Place newly allocated data buffer */ 2863 sk_mem_charge(msg->sk, len); 2864 msg->sg.size += len; 2865 __clear_bit(new, msg->sg.copy); 2866 sg_set_page(&msg->sg.data[new], page, len + copy, 0); 2867 if (rsge.length) { 2868 get_page(sg_page(&rsge)); 2869 sk_msg_iter_var_next(new); 2870 msg->sg.data[new] = rsge; 2871 } 2872 2873 sk_msg_reset_curr(msg); 2874 sk_msg_compute_data_pointers(msg); 2875 return 0; 2876 } 2877 2878 static const struct bpf_func_proto bpf_msg_push_data_proto = { 2879 .func = bpf_msg_push_data, 2880 .gpl_only = false, 2881 .ret_type = RET_INTEGER, 2882 .arg1_type = ARG_PTR_TO_CTX, 2883 .arg2_type = ARG_ANYTHING, 2884 .arg3_type = ARG_ANYTHING, 2885 .arg4_type = ARG_ANYTHING, 2886 }; 2887 2888 static void sk_msg_shift_left(struct sk_msg *msg, int i) 2889 { 2890 int prev; 2891 2892 do { 2893 prev = i; 2894 sk_msg_iter_var_next(i); 2895 msg->sg.data[prev] = msg->sg.data[i]; 2896 } while (i != msg->sg.end); 2897 2898 sk_msg_iter_prev(msg, end); 2899 } 2900 2901 static void sk_msg_shift_right(struct sk_msg *msg, int i) 2902 { 2903 struct scatterlist tmp, sge; 2904 2905 sk_msg_iter_next(msg, end); 2906 sge = sk_msg_elem_cpy(msg, i); 2907 sk_msg_iter_var_next(i); 2908 tmp = sk_msg_elem_cpy(msg, i); 2909 2910 while (i != msg->sg.end) { 2911 msg->sg.data[i] = sge; 2912 sk_msg_iter_var_next(i); 2913 sge = tmp; 2914 tmp = sk_msg_elem_cpy(msg, i); 2915 } 2916 } 2917 2918 BPF_CALL_4(bpf_msg_pop_data, struct sk_msg *, msg, u32, start, 2919 u32, len, u64, flags) 2920 { 2921 u32 i = 0, l = 0, space, offset = 0; 2922 u64 last = start + len; 2923 int pop; 2924 2925 if (unlikely(flags)) 2926 return -EINVAL; 2927 2928 /* First find the starting scatterlist element */ 2929 i = msg->sg.start; 2930 do { 2931 offset += l; 2932 l = sk_msg_elem(msg, i)->length; 2933 2934 if (start < offset + l) 2935 break; 2936 sk_msg_iter_var_next(i); 2937 } while (i != msg->sg.end); 2938 2939 /* Bounds checks: start and pop must be inside message */ 2940 if (start >= offset + l || last >= msg->sg.size) 2941 return -EINVAL; 2942 2943 space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); 2944 2945 pop = len; 2946 /* --------------| offset 2947 * -| start |-------- len -------| 2948 * 2949 * |----- a ----|-------- pop -------|----- b ----| 2950 * |______________________________________________| length 2951 * 2952 * 2953 * a: region at front of scatter element to save 2954 * b: region at back of scatter element to save when length > A + pop 2955 * pop: region to pop from element, same as input 'pop' here will be 2956 * decremented below per iteration. 2957 * 2958 * Two top-level cases to handle when start != offset, first B is non 2959 * zero and second B is zero corresponding to when a pop includes more 2960 * than one element. 2961 * 2962 * Then if B is non-zero AND there is no space allocate space and 2963 * compact A, B regions into page. If there is space shift ring to 2964 * the rigth free'ing the next element in ring to place B, leaving 2965 * A untouched except to reduce length. 2966 */ 2967 if (start != offset) { 2968 struct scatterlist *nsge, *sge = sk_msg_elem(msg, i); 2969 int a = start; 2970 int b = sge->length - pop - a; 2971 2972 sk_msg_iter_var_next(i); 2973 2974 if (pop < sge->length - a) { 2975 if (space) { 2976 sge->length = a; 2977 sk_msg_shift_right(msg, i); 2978 nsge = sk_msg_elem(msg, i); 2979 get_page(sg_page(sge)); 2980 sg_set_page(nsge, 2981 sg_page(sge), 2982 b, sge->offset + pop + a); 2983 } else { 2984 struct page *page, *orig; 2985 u8 *to, *from; 2986 2987 page = alloc_pages(__GFP_NOWARN | 2988 __GFP_COMP | GFP_ATOMIC, 2989 get_order(a + b)); 2990 if (unlikely(!page)) 2991 return -ENOMEM; 2992 2993 sge->length = a; 2994 orig = sg_page(sge); 2995 from = sg_virt(sge); 2996 to = page_address(page); 2997 memcpy(to, from, a); 2998 memcpy(to + a, from + a + pop, b); 2999 sg_set_page(sge, page, a + b, 0); 3000 put_page(orig); 3001 } 3002 pop = 0; 3003 } else if (pop >= sge->length - a) { 3004 pop -= (sge->length - a); 3005 sge->length = a; 3006 } 3007 } 3008 3009 /* From above the current layout _must_ be as follows, 3010 * 3011 * -| offset 3012 * -| start 3013 * 3014 * |---- pop ---|---------------- b ------------| 3015 * |____________________________________________| length 3016 * 3017 * Offset and start of the current msg elem are equal because in the 3018 * previous case we handled offset != start and either consumed the 3019 * entire element and advanced to the next element OR pop == 0. 3020 * 3021 * Two cases to handle here are first pop is less than the length 3022 * leaving some remainder b above. Simply adjust the element's layout 3023 * in this case. Or pop >= length of the element so that b = 0. In this 3024 * case advance to next element decrementing pop. 3025 */ 3026 while (pop) { 3027 struct scatterlist *sge = sk_msg_elem(msg, i); 3028 3029 if (pop < sge->length) { 3030 sge->length -= pop; 3031 sge->offset += pop; 3032 pop = 0; 3033 } else { 3034 pop -= sge->length; 3035 sk_msg_shift_left(msg, i); 3036 } 3037 sk_msg_iter_var_next(i); 3038 } 3039 3040 sk_mem_uncharge(msg->sk, len - pop); 3041 msg->sg.size -= (len - pop); 3042 sk_msg_reset_curr(msg); 3043 sk_msg_compute_data_pointers(msg); 3044 return 0; 3045 } 3046 3047 static const struct bpf_func_proto bpf_msg_pop_data_proto = { 3048 .func = bpf_msg_pop_data, 3049 .gpl_only = false, 3050 .ret_type = RET_INTEGER, 3051 .arg1_type = ARG_PTR_TO_CTX, 3052 .arg2_type = ARG_ANYTHING, 3053 .arg3_type = ARG_ANYTHING, 3054 .arg4_type = ARG_ANYTHING, 3055 }; 3056 3057 #ifdef CONFIG_CGROUP_NET_CLASSID 3058 BPF_CALL_0(bpf_get_cgroup_classid_curr) 3059 { 3060 return __task_get_classid(current); 3061 } 3062 3063 const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto = { 3064 .func = bpf_get_cgroup_classid_curr, 3065 .gpl_only = false, 3066 .ret_type = RET_INTEGER, 3067 }; 3068 3069 BPF_CALL_1(bpf_skb_cgroup_classid, const struct sk_buff *, skb) 3070 { 3071 struct sock *sk = skb_to_full_sk(skb); 3072 3073 if (!sk || !sk_fullsock(sk)) 3074 return 0; 3075 3076 return sock_cgroup_classid(&sk->sk_cgrp_data); 3077 } 3078 3079 static const struct bpf_func_proto bpf_skb_cgroup_classid_proto = { 3080 .func = bpf_skb_cgroup_classid, 3081 .gpl_only = false, 3082 .ret_type = RET_INTEGER, 3083 .arg1_type = ARG_PTR_TO_CTX, 3084 }; 3085 #endif 3086 3087 BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb) 3088 { 3089 return task_get_classid(skb); 3090 } 3091 3092 static const struct bpf_func_proto bpf_get_cgroup_classid_proto = { 3093 .func = bpf_get_cgroup_classid, 3094 .gpl_only = false, 3095 .ret_type = RET_INTEGER, 3096 .arg1_type = ARG_PTR_TO_CTX, 3097 }; 3098 3099 BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb) 3100 { 3101 return dst_tclassid(skb); 3102 } 3103 3104 static const struct bpf_func_proto bpf_get_route_realm_proto = { 3105 .func = bpf_get_route_realm, 3106 .gpl_only = false, 3107 .ret_type = RET_INTEGER, 3108 .arg1_type = ARG_PTR_TO_CTX, 3109 }; 3110 3111 BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb) 3112 { 3113 /* If skb_clear_hash() was called due to mangling, we can 3114 * trigger SW recalculation here. Later access to hash 3115 * can then use the inline skb->hash via context directly 3116 * instead of calling this helper again. 3117 */ 3118 return skb_get_hash(skb); 3119 } 3120 3121 static const struct bpf_func_proto bpf_get_hash_recalc_proto = { 3122 .func = bpf_get_hash_recalc, 3123 .gpl_only = false, 3124 .ret_type = RET_INTEGER, 3125 .arg1_type = ARG_PTR_TO_CTX, 3126 }; 3127 3128 BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb) 3129 { 3130 /* After all direct packet write, this can be used once for 3131 * triggering a lazy recalc on next skb_get_hash() invocation. 3132 */ 3133 skb_clear_hash(skb); 3134 return 0; 3135 } 3136 3137 static const struct bpf_func_proto bpf_set_hash_invalid_proto = { 3138 .func = bpf_set_hash_invalid, 3139 .gpl_only = false, 3140 .ret_type = RET_INTEGER, 3141 .arg1_type = ARG_PTR_TO_CTX, 3142 }; 3143 3144 BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash) 3145 { 3146 /* Set user specified hash as L4(+), so that it gets returned 3147 * on skb_get_hash() call unless BPF prog later on triggers a 3148 * skb_clear_hash(). 3149 */ 3150 __skb_set_sw_hash(skb, hash, true); 3151 return 0; 3152 } 3153 3154 static const struct bpf_func_proto bpf_set_hash_proto = { 3155 .func = bpf_set_hash, 3156 .gpl_only = false, 3157 .ret_type = RET_INTEGER, 3158 .arg1_type = ARG_PTR_TO_CTX, 3159 .arg2_type = ARG_ANYTHING, 3160 }; 3161 3162 BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto, 3163 u16, vlan_tci) 3164 { 3165 int ret; 3166 3167 if (unlikely(vlan_proto != htons(ETH_P_8021Q) && 3168 vlan_proto != htons(ETH_P_8021AD))) 3169 vlan_proto = htons(ETH_P_8021Q); 3170 3171 bpf_push_mac_rcsum(skb); 3172 ret = skb_vlan_push(skb, vlan_proto, vlan_tci); 3173 bpf_pull_mac_rcsum(skb); 3174 3175 bpf_compute_data_pointers(skb); 3176 return ret; 3177 } 3178 3179 static const struct bpf_func_proto bpf_skb_vlan_push_proto = { 3180 .func = bpf_skb_vlan_push, 3181 .gpl_only = false, 3182 .ret_type = RET_INTEGER, 3183 .arg1_type = ARG_PTR_TO_CTX, 3184 .arg2_type = ARG_ANYTHING, 3185 .arg3_type = ARG_ANYTHING, 3186 }; 3187 3188 BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb) 3189 { 3190 int ret; 3191 3192 bpf_push_mac_rcsum(skb); 3193 ret = skb_vlan_pop(skb); 3194 bpf_pull_mac_rcsum(skb); 3195 3196 bpf_compute_data_pointers(skb); 3197 return ret; 3198 } 3199 3200 static const struct bpf_func_proto bpf_skb_vlan_pop_proto = { 3201 .func = bpf_skb_vlan_pop, 3202 .gpl_only = false, 3203 .ret_type = RET_INTEGER, 3204 .arg1_type = ARG_PTR_TO_CTX, 3205 }; 3206 3207 static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len) 3208 { 3209 /* Caller already did skb_cow() with len as headroom, 3210 * so no need to do it here. 3211 */ 3212 skb_push(skb, len); 3213 memmove(skb->data, skb->data + len, off); 3214 memset(skb->data + off, 0, len); 3215 3216 /* No skb_postpush_rcsum(skb, skb->data + off, len) 3217 * needed here as it does not change the skb->csum 3218 * result for checksum complete when summing over 3219 * zeroed blocks. 3220 */ 3221 return 0; 3222 } 3223 3224 static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len) 3225 { 3226 void *old_data; 3227 3228 /* skb_ensure_writable() is not needed here, as we're 3229 * already working on an uncloned skb. 3230 */ 3231 if (unlikely(!pskb_may_pull(skb, off + len))) 3232 return -ENOMEM; 3233 3234 old_data = skb->data; 3235 __skb_pull(skb, len); 3236 skb_postpull_rcsum(skb, old_data + off, len); 3237 memmove(skb->data, old_data, off); 3238 3239 return 0; 3240 } 3241 3242 static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len) 3243 { 3244 bool trans_same = skb->transport_header == skb->network_header; 3245 int ret; 3246 3247 /* There's no need for __skb_push()/__skb_pull() pair to 3248 * get to the start of the mac header as we're guaranteed 3249 * to always start from here under eBPF. 3250 */ 3251 ret = bpf_skb_generic_push(skb, off, len); 3252 if (likely(!ret)) { 3253 skb->mac_header -= len; 3254 skb->network_header -= len; 3255 if (trans_same) 3256 skb->transport_header = skb->network_header; 3257 } 3258 3259 return ret; 3260 } 3261 3262 static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len) 3263 { 3264 bool trans_same = skb->transport_header == skb->network_header; 3265 int ret; 3266 3267 /* Same here, __skb_push()/__skb_pull() pair not needed. */ 3268 ret = bpf_skb_generic_pop(skb, off, len); 3269 if (likely(!ret)) { 3270 skb->mac_header += len; 3271 skb->network_header += len; 3272 if (trans_same) 3273 skb->transport_header = skb->network_header; 3274 } 3275 3276 return ret; 3277 } 3278 3279 static int bpf_skb_proto_4_to_6(struct sk_buff *skb) 3280 { 3281 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); 3282 u32 off = skb_mac_header_len(skb); 3283 int ret; 3284 3285 ret = skb_cow(skb, len_diff); 3286 if (unlikely(ret < 0)) 3287 return ret; 3288 3289 ret = bpf_skb_net_hdr_push(skb, off, len_diff); 3290 if (unlikely(ret < 0)) 3291 return ret; 3292 3293 if (skb_is_gso(skb)) { 3294 struct skb_shared_info *shinfo = skb_shinfo(skb); 3295 3296 /* SKB_GSO_TCPV4 needs to be changed into SKB_GSO_TCPV6. */ 3297 if (shinfo->gso_type & SKB_GSO_TCPV4) { 3298 shinfo->gso_type &= ~SKB_GSO_TCPV4; 3299 shinfo->gso_type |= SKB_GSO_TCPV6; 3300 } 3301 } 3302 3303 skb->protocol = htons(ETH_P_IPV6); 3304 skb_clear_hash(skb); 3305 3306 return 0; 3307 } 3308 3309 static int bpf_skb_proto_6_to_4(struct sk_buff *skb) 3310 { 3311 const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); 3312 u32 off = skb_mac_header_len(skb); 3313 int ret; 3314 3315 ret = skb_unclone(skb, GFP_ATOMIC); 3316 if (unlikely(ret < 0)) 3317 return ret; 3318 3319 ret = bpf_skb_net_hdr_pop(skb, off, len_diff); 3320 if (unlikely(ret < 0)) 3321 return ret; 3322 3323 if (skb_is_gso(skb)) { 3324 struct skb_shared_info *shinfo = skb_shinfo(skb); 3325 3326 /* SKB_GSO_TCPV6 needs to be changed into SKB_GSO_TCPV4. */ 3327 if (shinfo->gso_type & SKB_GSO_TCPV6) { 3328 shinfo->gso_type &= ~SKB_GSO_TCPV6; 3329 shinfo->gso_type |= SKB_GSO_TCPV4; 3330 } 3331 } 3332 3333 skb->protocol = htons(ETH_P_IP); 3334 skb_clear_hash(skb); 3335 3336 return 0; 3337 } 3338 3339 static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto) 3340 { 3341 __be16 from_proto = skb->protocol; 3342 3343 if (from_proto == htons(ETH_P_IP) && 3344 to_proto == htons(ETH_P_IPV6)) 3345 return bpf_skb_proto_4_to_6(skb); 3346 3347 if (from_proto == htons(ETH_P_IPV6) && 3348 to_proto == htons(ETH_P_IP)) 3349 return bpf_skb_proto_6_to_4(skb); 3350 3351 return -ENOTSUPP; 3352 } 3353 3354 BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto, 3355 u64, flags) 3356 { 3357 int ret; 3358 3359 if (unlikely(flags)) 3360 return -EINVAL; 3361 3362 /* General idea is that this helper does the basic groundwork 3363 * needed for changing the protocol, and eBPF program fills the 3364 * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace() 3365 * and other helpers, rather than passing a raw buffer here. 3366 * 3367 * The rationale is to keep this minimal and without a need to 3368 * deal with raw packet data. F.e. even if we would pass buffers 3369 * here, the program still needs to call the bpf_lX_csum_replace() 3370 * helpers anyway. Plus, this way we keep also separation of 3371 * concerns, since f.e. bpf_skb_store_bytes() should only take 3372 * care of stores. 3373 * 3374 * Currently, additional options and extension header space are 3375 * not supported, but flags register is reserved so we can adapt 3376 * that. For offloads, we mark packet as dodgy, so that headers 3377 * need to be verified first. 3378 */ 3379 ret = bpf_skb_proto_xlat(skb, proto); 3380 bpf_compute_data_pointers(skb); 3381 return ret; 3382 } 3383 3384 static const struct bpf_func_proto bpf_skb_change_proto_proto = { 3385 .func = bpf_skb_change_proto, 3386 .gpl_only = false, 3387 .ret_type = RET_INTEGER, 3388 .arg1_type = ARG_PTR_TO_CTX, 3389 .arg2_type = ARG_ANYTHING, 3390 .arg3_type = ARG_ANYTHING, 3391 }; 3392 3393 BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type) 3394 { 3395 /* We only allow a restricted subset to be changed for now. */ 3396 if (unlikely(!skb_pkt_type_ok(skb->pkt_type) || 3397 !skb_pkt_type_ok(pkt_type))) 3398 return -EINVAL; 3399 3400 skb->pkt_type = pkt_type; 3401 return 0; 3402 } 3403 3404 static const struct bpf_func_proto bpf_skb_change_type_proto = { 3405 .func = bpf_skb_change_type, 3406 .gpl_only = false, 3407 .ret_type = RET_INTEGER, 3408 .arg1_type = ARG_PTR_TO_CTX, 3409 .arg2_type = ARG_ANYTHING, 3410 }; 3411 3412 static u32 bpf_skb_net_base_len(const struct sk_buff *skb) 3413 { 3414 switch (skb->protocol) { 3415 case htons(ETH_P_IP): 3416 return sizeof(struct iphdr); 3417 case htons(ETH_P_IPV6): 3418 return sizeof(struct ipv6hdr); 3419 default: 3420 return ~0U; 3421 } 3422 } 3423 3424 #define BPF_F_ADJ_ROOM_ENCAP_L3_MASK (BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 | \ 3425 BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3426 3427 #define BPF_F_ADJ_ROOM_DECAP_L3_MASK (BPF_F_ADJ_ROOM_DECAP_L3_IPV4 | \ 3428 BPF_F_ADJ_ROOM_DECAP_L3_IPV6) 3429 3430 #define BPF_F_ADJ_ROOM_MASK (BPF_F_ADJ_ROOM_FIXED_GSO | \ 3431 BPF_F_ADJ_ROOM_ENCAP_L3_MASK | \ 3432 BPF_F_ADJ_ROOM_ENCAP_L4_GRE | \ 3433 BPF_F_ADJ_ROOM_ENCAP_L4_UDP | \ 3434 BPF_F_ADJ_ROOM_ENCAP_L2_ETH | \ 3435 BPF_F_ADJ_ROOM_ENCAP_L2( \ 3436 BPF_ADJ_ROOM_ENCAP_L2_MASK) | \ 3437 BPF_F_ADJ_ROOM_DECAP_L3_MASK) 3438 3439 static int bpf_skb_net_grow(struct sk_buff *skb, u32 off, u32 len_diff, 3440 u64 flags) 3441 { 3442 u8 inner_mac_len = flags >> BPF_ADJ_ROOM_ENCAP_L2_SHIFT; 3443 bool encap = flags & BPF_F_ADJ_ROOM_ENCAP_L3_MASK; 3444 u16 mac_len = 0, inner_net = 0, inner_trans = 0; 3445 unsigned int gso_type = SKB_GSO_DODGY; 3446 int ret; 3447 3448 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { 3449 /* udp gso_size delineates datagrams, only allow if fixed */ 3450 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || 3451 !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3452 return -ENOTSUPP; 3453 } 3454 3455 ret = skb_cow_head(skb, len_diff); 3456 if (unlikely(ret < 0)) 3457 return ret; 3458 3459 if (encap) { 3460 if (skb->protocol != htons(ETH_P_IP) && 3461 skb->protocol != htons(ETH_P_IPV6)) 3462 return -ENOTSUPP; 3463 3464 if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 && 3465 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3466 return -EINVAL; 3467 3468 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE && 3469 flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) 3470 return -EINVAL; 3471 3472 if (flags & BPF_F_ADJ_ROOM_ENCAP_L2_ETH && 3473 inner_mac_len < ETH_HLEN) 3474 return -EINVAL; 3475 3476 if (skb->encapsulation) 3477 return -EALREADY; 3478 3479 mac_len = skb->network_header - skb->mac_header; 3480 inner_net = skb->network_header; 3481 if (inner_mac_len > len_diff) 3482 return -EINVAL; 3483 inner_trans = skb->transport_header; 3484 } 3485 3486 ret = bpf_skb_net_hdr_push(skb, off, len_diff); 3487 if (unlikely(ret < 0)) 3488 return ret; 3489 3490 if (encap) { 3491 skb->inner_mac_header = inner_net - inner_mac_len; 3492 skb->inner_network_header = inner_net; 3493 skb->inner_transport_header = inner_trans; 3494 3495 if (flags & BPF_F_ADJ_ROOM_ENCAP_L2_ETH) 3496 skb_set_inner_protocol(skb, htons(ETH_P_TEB)); 3497 else 3498 skb_set_inner_protocol(skb, skb->protocol); 3499 3500 skb->encapsulation = 1; 3501 skb_set_network_header(skb, mac_len); 3502 3503 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) 3504 gso_type |= SKB_GSO_UDP_TUNNEL; 3505 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE) 3506 gso_type |= SKB_GSO_GRE; 3507 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3508 gso_type |= SKB_GSO_IPXIP6; 3509 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) 3510 gso_type |= SKB_GSO_IPXIP4; 3511 3512 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE || 3513 flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) { 3514 int nh_len = flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6 ? 3515 sizeof(struct ipv6hdr) : 3516 sizeof(struct iphdr); 3517 3518 skb_set_transport_header(skb, mac_len + nh_len); 3519 } 3520 3521 /* Match skb->protocol to new outer l3 protocol */ 3522 if (skb->protocol == htons(ETH_P_IP) && 3523 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) 3524 skb->protocol = htons(ETH_P_IPV6); 3525 else if (skb->protocol == htons(ETH_P_IPV6) && 3526 flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) 3527 skb->protocol = htons(ETH_P_IP); 3528 } 3529 3530 if (skb_is_gso(skb)) { 3531 struct skb_shared_info *shinfo = skb_shinfo(skb); 3532 3533 /* Due to header grow, MSS needs to be downgraded. */ 3534 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3535 skb_decrease_gso_size(shinfo, len_diff); 3536 3537 /* Header must be checked, and gso_segs recomputed. */ 3538 shinfo->gso_type |= gso_type; 3539 shinfo->gso_segs = 0; 3540 } 3541 3542 return 0; 3543 } 3544 3545 static int bpf_skb_net_shrink(struct sk_buff *skb, u32 off, u32 len_diff, 3546 u64 flags) 3547 { 3548 int ret; 3549 3550 if (unlikely(flags & ~(BPF_F_ADJ_ROOM_FIXED_GSO | 3551 BPF_F_ADJ_ROOM_DECAP_L3_MASK | 3552 BPF_F_ADJ_ROOM_NO_CSUM_RESET))) 3553 return -EINVAL; 3554 3555 if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { 3556 /* udp gso_size delineates datagrams, only allow if fixed */ 3557 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || 3558 !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3559 return -ENOTSUPP; 3560 } 3561 3562 ret = skb_unclone(skb, GFP_ATOMIC); 3563 if (unlikely(ret < 0)) 3564 return ret; 3565 3566 ret = bpf_skb_net_hdr_pop(skb, off, len_diff); 3567 if (unlikely(ret < 0)) 3568 return ret; 3569 3570 /* Match skb->protocol to new outer l3 protocol */ 3571 if (skb->protocol == htons(ETH_P_IP) && 3572 flags & BPF_F_ADJ_ROOM_DECAP_L3_IPV6) 3573 skb->protocol = htons(ETH_P_IPV6); 3574 else if (skb->protocol == htons(ETH_P_IPV6) && 3575 flags & BPF_F_ADJ_ROOM_DECAP_L3_IPV4) 3576 skb->protocol = htons(ETH_P_IP); 3577 3578 if (skb_is_gso(skb)) { 3579 struct skb_shared_info *shinfo = skb_shinfo(skb); 3580 3581 /* Due to header shrink, MSS can be upgraded. */ 3582 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) 3583 skb_increase_gso_size(shinfo, len_diff); 3584 3585 /* Header must be checked, and gso_segs recomputed. */ 3586 shinfo->gso_type |= SKB_GSO_DODGY; 3587 shinfo->gso_segs = 0; 3588 } 3589 3590 return 0; 3591 } 3592 3593 #define BPF_SKB_MAX_LEN SKB_MAX_ALLOC 3594 3595 BPF_CALL_4(sk_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, 3596 u32, mode, u64, flags) 3597 { 3598 u32 len_diff_abs = abs(len_diff); 3599 bool shrink = len_diff < 0; 3600 int ret = 0; 3601 3602 if (unlikely(flags || mode)) 3603 return -EINVAL; 3604 if (unlikely(len_diff_abs > 0xfffU)) 3605 return -EFAULT; 3606 3607 if (!shrink) { 3608 ret = skb_cow(skb, len_diff); 3609 if (unlikely(ret < 0)) 3610 return ret; 3611 __skb_push(skb, len_diff_abs); 3612 memset(skb->data, 0, len_diff_abs); 3613 } else { 3614 if (unlikely(!pskb_may_pull(skb, len_diff_abs))) 3615 return -ENOMEM; 3616 __skb_pull(skb, len_diff_abs); 3617 } 3618 if (tls_sw_has_ctx_rx(skb->sk)) { 3619 struct strp_msg *rxm = strp_msg(skb); 3620 3621 rxm->full_len += len_diff; 3622 } 3623 return ret; 3624 } 3625 3626 static const struct bpf_func_proto sk_skb_adjust_room_proto = { 3627 .func = sk_skb_adjust_room, 3628 .gpl_only = false, 3629 .ret_type = RET_INTEGER, 3630 .arg1_type = ARG_PTR_TO_CTX, 3631 .arg2_type = ARG_ANYTHING, 3632 .arg3_type = ARG_ANYTHING, 3633 .arg4_type = ARG_ANYTHING, 3634 }; 3635 3636 BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, 3637 u32, mode, u64, flags) 3638 { 3639 u32 len_cur, len_diff_abs = abs(len_diff); 3640 u32 len_min = bpf_skb_net_base_len(skb); 3641 u32 len_max = BPF_SKB_MAX_LEN; 3642 __be16 proto = skb->protocol; 3643 bool shrink = len_diff < 0; 3644 u32 off; 3645 int ret; 3646 3647 if (unlikely(flags & ~(BPF_F_ADJ_ROOM_MASK | 3648 BPF_F_ADJ_ROOM_NO_CSUM_RESET))) 3649 return -EINVAL; 3650 if (unlikely(len_diff_abs > 0xfffU)) 3651 return -EFAULT; 3652 if (unlikely(proto != htons(ETH_P_IP) && 3653 proto != htons(ETH_P_IPV6))) 3654 return -ENOTSUPP; 3655 3656 off = skb_mac_header_len(skb); 3657 switch (mode) { 3658 case BPF_ADJ_ROOM_NET: 3659 off += bpf_skb_net_base_len(skb); 3660 break; 3661 case BPF_ADJ_ROOM_MAC: 3662 break; 3663 default: 3664 return -ENOTSUPP; 3665 } 3666 3667 if (flags & BPF_F_ADJ_ROOM_DECAP_L3_MASK) { 3668 if (!shrink) 3669 return -EINVAL; 3670 3671 switch (flags & BPF_F_ADJ_ROOM_DECAP_L3_MASK) { 3672 case BPF_F_ADJ_ROOM_DECAP_L3_IPV4: 3673 len_min = sizeof(struct iphdr); 3674 break; 3675 case BPF_F_ADJ_ROOM_DECAP_L3_IPV6: 3676 len_min = sizeof(struct ipv6hdr); 3677 break; 3678 default: 3679 return -EINVAL; 3680 } 3681 } 3682 3683 len_cur = skb->len - skb_network_offset(skb); 3684 if ((shrink && (len_diff_abs >= len_cur || 3685 len_cur - len_diff_abs < len_min)) || 3686 (!shrink && (skb->len + len_diff_abs > len_max && 3687 !skb_is_gso(skb)))) 3688 return -ENOTSUPP; 3689 3690 ret = shrink ? bpf_skb_net_shrink(skb, off, len_diff_abs, flags) : 3691 bpf_skb_net_grow(skb, off, len_diff_abs, flags); 3692 if (!ret && !(flags & BPF_F_ADJ_ROOM_NO_CSUM_RESET)) 3693 __skb_reset_checksum_unnecessary(skb); 3694 3695 bpf_compute_data_pointers(skb); 3696 return ret; 3697 } 3698 3699 static const struct bpf_func_proto bpf_skb_adjust_room_proto = { 3700 .func = bpf_skb_adjust_room, 3701 .gpl_only = false, 3702 .ret_type = RET_INTEGER, 3703 .arg1_type = ARG_PTR_TO_CTX, 3704 .arg2_type = ARG_ANYTHING, 3705 .arg3_type = ARG_ANYTHING, 3706 .arg4_type = ARG_ANYTHING, 3707 }; 3708 3709 static u32 __bpf_skb_min_len(const struct sk_buff *skb) 3710 { 3711 u32 min_len = skb_network_offset(skb); 3712 3713 if (skb_transport_header_was_set(skb)) 3714 min_len = skb_transport_offset(skb); 3715 if (skb->ip_summed == CHECKSUM_PARTIAL) 3716 min_len = skb_checksum_start_offset(skb) + 3717 skb->csum_offset + sizeof(__sum16); 3718 return min_len; 3719 } 3720 3721 static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len) 3722 { 3723 unsigned int old_len = skb->len; 3724 int ret; 3725 3726 ret = __skb_grow_rcsum(skb, new_len); 3727 if (!ret) 3728 memset(skb->data + old_len, 0, new_len - old_len); 3729 return ret; 3730 } 3731 3732 static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len) 3733 { 3734 return __skb_trim_rcsum(skb, new_len); 3735 } 3736 3737 static inline int __bpf_skb_change_tail(struct sk_buff *skb, u32 new_len, 3738 u64 flags) 3739 { 3740 u32 max_len = BPF_SKB_MAX_LEN; 3741 u32 min_len = __bpf_skb_min_len(skb); 3742 int ret; 3743 3744 if (unlikely(flags || new_len > max_len || new_len < min_len)) 3745 return -EINVAL; 3746 if (skb->encapsulation) 3747 return -ENOTSUPP; 3748 3749 /* The basic idea of this helper is that it's performing the 3750 * needed work to either grow or trim an skb, and eBPF program 3751 * rewrites the rest via helpers like bpf_skb_store_bytes(), 3752 * bpf_lX_csum_replace() and others rather than passing a raw 3753 * buffer here. This one is a slow path helper and intended 3754 * for replies with control messages. 3755 * 3756 * Like in bpf_skb_change_proto(), we want to keep this rather 3757 * minimal and without protocol specifics so that we are able 3758 * to separate concerns as in bpf_skb_store_bytes() should only 3759 * be the one responsible for writing buffers. 3760 * 3761 * It's really expected to be a slow path operation here for 3762 * control message replies, so we're implicitly linearizing, 3763 * uncloning and drop offloads from the skb by this. 3764 */ 3765 ret = __bpf_try_make_writable(skb, skb->len); 3766 if (!ret) { 3767 if (new_len > skb->len) 3768 ret = bpf_skb_grow_rcsum(skb, new_len); 3769 else if (new_len < skb->len) 3770 ret = bpf_skb_trim_rcsum(skb, new_len); 3771 if (!ret && skb_is_gso(skb)) 3772 skb_gso_reset(skb); 3773 } 3774 return ret; 3775 } 3776 3777 BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len, 3778 u64, flags) 3779 { 3780 int ret = __bpf_skb_change_tail(skb, new_len, flags); 3781 3782 bpf_compute_data_pointers(skb); 3783 return ret; 3784 } 3785 3786 static const struct bpf_func_proto bpf_skb_change_tail_proto = { 3787 .func = bpf_skb_change_tail, 3788 .gpl_only = false, 3789 .ret_type = RET_INTEGER, 3790 .arg1_type = ARG_PTR_TO_CTX, 3791 .arg2_type = ARG_ANYTHING, 3792 .arg3_type = ARG_ANYTHING, 3793 }; 3794 3795 BPF_CALL_3(sk_skb_change_tail, struct sk_buff *, skb, u32, new_len, 3796 u64, flags) 3797 { 3798 return __bpf_skb_change_tail(skb, new_len, flags); 3799 } 3800 3801 static const struct bpf_func_proto sk_skb_change_tail_proto = { 3802 .func = sk_skb_change_tail, 3803 .gpl_only = false, 3804 .ret_type = RET_INTEGER, 3805 .arg1_type = ARG_PTR_TO_CTX, 3806 .arg2_type = ARG_ANYTHING, 3807 .arg3_type = ARG_ANYTHING, 3808 }; 3809 3810 static inline int __bpf_skb_change_head(struct sk_buff *skb, u32 head_room, 3811 u64 flags) 3812 { 3813 u32 max_len = BPF_SKB_MAX_LEN; 3814 u32 new_len = skb->len + head_room; 3815 int ret; 3816 3817 if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) || 3818 new_len < skb->len)) 3819 return -EINVAL; 3820 3821 ret = skb_cow(skb, head_room); 3822 if (likely(!ret)) { 3823 /* Idea for this helper is that we currently only 3824 * allow to expand on mac header. This means that 3825 * skb->protocol network header, etc, stay as is. 3826 * Compared to bpf_skb_change_tail(), we're more 3827 * flexible due to not needing to linearize or 3828 * reset GSO. Intention for this helper is to be 3829 * used by an L3 skb that needs to push mac header 3830 * for redirection into L2 device. 3831 */ 3832 __skb_push(skb, head_room); 3833 memset(skb->data, 0, head_room); 3834 skb_reset_mac_header(skb); 3835 skb_reset_mac_len(skb); 3836 } 3837 3838 return ret; 3839 } 3840 3841 BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room, 3842 u64, flags) 3843 { 3844 int ret = __bpf_skb_change_head(skb, head_room, flags); 3845 3846 bpf_compute_data_pointers(skb); 3847 return ret; 3848 } 3849 3850 static const struct bpf_func_proto bpf_skb_change_head_proto = { 3851 .func = bpf_skb_change_head, 3852 .gpl_only = false, 3853 .ret_type = RET_INTEGER, 3854 .arg1_type = ARG_PTR_TO_CTX, 3855 .arg2_type = ARG_ANYTHING, 3856 .arg3_type = ARG_ANYTHING, 3857 }; 3858 3859 BPF_CALL_3(sk_skb_change_head, struct sk_buff *, skb, u32, head_room, 3860 u64, flags) 3861 { 3862 return __bpf_skb_change_head(skb, head_room, flags); 3863 } 3864 3865 static const struct bpf_func_proto sk_skb_change_head_proto = { 3866 .func = sk_skb_change_head, 3867 .gpl_only = false, 3868 .ret_type = RET_INTEGER, 3869 .arg1_type = ARG_PTR_TO_CTX, 3870 .arg2_type = ARG_ANYTHING, 3871 .arg3_type = ARG_ANYTHING, 3872 }; 3873 3874 BPF_CALL_1(bpf_xdp_get_buff_len, struct xdp_buff*, xdp) 3875 { 3876 return xdp_get_buff_len(xdp); 3877 } 3878 3879 static const struct bpf_func_proto bpf_xdp_get_buff_len_proto = { 3880 .func = bpf_xdp_get_buff_len, 3881 .gpl_only = false, 3882 .ret_type = RET_INTEGER, 3883 .arg1_type = ARG_PTR_TO_CTX, 3884 }; 3885 3886 BTF_ID_LIST_SINGLE(bpf_xdp_get_buff_len_bpf_ids, struct, xdp_buff) 3887 3888 const struct bpf_func_proto bpf_xdp_get_buff_len_trace_proto = { 3889 .func = bpf_xdp_get_buff_len, 3890 .gpl_only = false, 3891 .arg1_type = ARG_PTR_TO_BTF_ID, 3892 .arg1_btf_id = &bpf_xdp_get_buff_len_bpf_ids[0], 3893 }; 3894 3895 static unsigned long xdp_get_metalen(const struct xdp_buff *xdp) 3896 { 3897 return xdp_data_meta_unsupported(xdp) ? 0 : 3898 xdp->data - xdp->data_meta; 3899 } 3900 3901 BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset) 3902 { 3903 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); 3904 unsigned long metalen = xdp_get_metalen(xdp); 3905 void *data_start = xdp_frame_end + metalen; 3906 void *data = xdp->data + offset; 3907 3908 if (unlikely(data < data_start || 3909 data > xdp->data_end - ETH_HLEN)) 3910 return -EINVAL; 3911 3912 if (metalen) 3913 memmove(xdp->data_meta + offset, 3914 xdp->data_meta, metalen); 3915 xdp->data_meta += offset; 3916 xdp->data = data; 3917 3918 return 0; 3919 } 3920 3921 static const struct bpf_func_proto bpf_xdp_adjust_head_proto = { 3922 .func = bpf_xdp_adjust_head, 3923 .gpl_only = false, 3924 .ret_type = RET_INTEGER, 3925 .arg1_type = ARG_PTR_TO_CTX, 3926 .arg2_type = ARG_ANYTHING, 3927 }; 3928 3929 void bpf_xdp_copy_buf(struct xdp_buff *xdp, unsigned long off, 3930 void *buf, unsigned long len, bool flush) 3931 { 3932 unsigned long ptr_len, ptr_off = 0; 3933 skb_frag_t *next_frag, *end_frag; 3934 struct skb_shared_info *sinfo; 3935 void *src, *dst; 3936 u8 *ptr_buf; 3937 3938 if (likely(xdp->data_end - xdp->data >= off + len)) { 3939 src = flush ? buf : xdp->data + off; 3940 dst = flush ? xdp->data + off : buf; 3941 memcpy(dst, src, len); 3942 return; 3943 } 3944 3945 sinfo = xdp_get_shared_info_from_buff(xdp); 3946 end_frag = &sinfo->frags[sinfo->nr_frags]; 3947 next_frag = &sinfo->frags[0]; 3948 3949 ptr_len = xdp->data_end - xdp->data; 3950 ptr_buf = xdp->data; 3951 3952 while (true) { 3953 if (off < ptr_off + ptr_len) { 3954 unsigned long copy_off = off - ptr_off; 3955 unsigned long copy_len = min(len, ptr_len - copy_off); 3956 3957 src = flush ? buf : ptr_buf + copy_off; 3958 dst = flush ? ptr_buf + copy_off : buf; 3959 memcpy(dst, src, copy_len); 3960 3961 off += copy_len; 3962 len -= copy_len; 3963 buf += copy_len; 3964 } 3965 3966 if (!len || next_frag == end_frag) 3967 break; 3968 3969 ptr_off += ptr_len; 3970 ptr_buf = skb_frag_address(next_frag); 3971 ptr_len = skb_frag_size(next_frag); 3972 next_frag++; 3973 } 3974 } 3975 3976 void *bpf_xdp_pointer(struct xdp_buff *xdp, u32 offset, u32 len) 3977 { 3978 u32 size = xdp->data_end - xdp->data; 3979 struct skb_shared_info *sinfo; 3980 void *addr = xdp->data; 3981 int i; 3982 3983 if (unlikely(offset > 0xffff || len > 0xffff)) 3984 return ERR_PTR(-EFAULT); 3985 3986 if (unlikely(offset + len > xdp_get_buff_len(xdp))) 3987 return ERR_PTR(-EINVAL); 3988 3989 if (likely(offset < size)) /* linear area */ 3990 goto out; 3991 3992 sinfo = xdp_get_shared_info_from_buff(xdp); 3993 offset -= size; 3994 for (i = 0; i < sinfo->nr_frags; i++) { /* paged area */ 3995 u32 frag_size = skb_frag_size(&sinfo->frags[i]); 3996 3997 if (offset < frag_size) { 3998 addr = skb_frag_address(&sinfo->frags[i]); 3999 size = frag_size; 4000 break; 4001 } 4002 offset -= frag_size; 4003 } 4004 out: 4005 return offset + len <= size ? addr + offset : NULL; 4006 } 4007 4008 BPF_CALL_4(bpf_xdp_load_bytes, struct xdp_buff *, xdp, u32, offset, 4009 void *, buf, u32, len) 4010 { 4011 void *ptr; 4012 4013 ptr = bpf_xdp_pointer(xdp, offset, len); 4014 if (IS_ERR(ptr)) 4015 return PTR_ERR(ptr); 4016 4017 if (!ptr) 4018 bpf_xdp_copy_buf(xdp, offset, buf, len, false); 4019 else 4020 memcpy(buf, ptr, len); 4021 4022 return 0; 4023 } 4024 4025 static const struct bpf_func_proto bpf_xdp_load_bytes_proto = { 4026 .func = bpf_xdp_load_bytes, 4027 .gpl_only = false, 4028 .ret_type = RET_INTEGER, 4029 .arg1_type = ARG_PTR_TO_CTX, 4030 .arg2_type = ARG_ANYTHING, 4031 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 4032 .arg4_type = ARG_CONST_SIZE, 4033 }; 4034 4035 int __bpf_xdp_load_bytes(struct xdp_buff *xdp, u32 offset, void *buf, u32 len) 4036 { 4037 return ____bpf_xdp_load_bytes(xdp, offset, buf, len); 4038 } 4039 4040 BPF_CALL_4(bpf_xdp_store_bytes, struct xdp_buff *, xdp, u32, offset, 4041 void *, buf, u32, len) 4042 { 4043 void *ptr; 4044 4045 ptr = bpf_xdp_pointer(xdp, offset, len); 4046 if (IS_ERR(ptr)) 4047 return PTR_ERR(ptr); 4048 4049 if (!ptr) 4050 bpf_xdp_copy_buf(xdp, offset, buf, len, true); 4051 else 4052 memcpy(ptr, buf, len); 4053 4054 return 0; 4055 } 4056 4057 static const struct bpf_func_proto bpf_xdp_store_bytes_proto = { 4058 .func = bpf_xdp_store_bytes, 4059 .gpl_only = false, 4060 .ret_type = RET_INTEGER, 4061 .arg1_type = ARG_PTR_TO_CTX, 4062 .arg2_type = ARG_ANYTHING, 4063 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 4064 .arg4_type = ARG_CONST_SIZE, 4065 }; 4066 4067 int __bpf_xdp_store_bytes(struct xdp_buff *xdp, u32 offset, void *buf, u32 len) 4068 { 4069 return ____bpf_xdp_store_bytes(xdp, offset, buf, len); 4070 } 4071 4072 static int bpf_xdp_frags_increase_tail(struct xdp_buff *xdp, int offset) 4073 { 4074 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); 4075 skb_frag_t *frag = &sinfo->frags[sinfo->nr_frags - 1]; 4076 struct xdp_rxq_info *rxq = xdp->rxq; 4077 unsigned int tailroom; 4078 4079 if (!rxq->frag_size || rxq->frag_size > xdp->frame_sz) 4080 return -EOPNOTSUPP; 4081 4082 tailroom = rxq->frag_size - skb_frag_size(frag) - skb_frag_off(frag); 4083 if (unlikely(offset > tailroom)) 4084 return -EINVAL; 4085 4086 memset(skb_frag_address(frag) + skb_frag_size(frag), 0, offset); 4087 skb_frag_size_add(frag, offset); 4088 sinfo->xdp_frags_size += offset; 4089 if (rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL) 4090 xsk_buff_get_tail(xdp)->data_end += offset; 4091 4092 return 0; 4093 } 4094 4095 static void bpf_xdp_shrink_data_zc(struct xdp_buff *xdp, int shrink, 4096 struct xdp_mem_info *mem_info, bool release) 4097 { 4098 struct xdp_buff *zc_frag = xsk_buff_get_tail(xdp); 4099 4100 if (release) { 4101 xsk_buff_del_tail(zc_frag); 4102 __xdp_return(NULL, mem_info, false, zc_frag); 4103 } else { 4104 zc_frag->data_end -= shrink; 4105 } 4106 } 4107 4108 static bool bpf_xdp_shrink_data(struct xdp_buff *xdp, skb_frag_t *frag, 4109 int shrink) 4110 { 4111 struct xdp_mem_info *mem_info = &xdp->rxq->mem; 4112 bool release = skb_frag_size(frag) == shrink; 4113 4114 if (mem_info->type == MEM_TYPE_XSK_BUFF_POOL) { 4115 bpf_xdp_shrink_data_zc(xdp, shrink, mem_info, release); 4116 goto out; 4117 } 4118 4119 if (release) { 4120 struct page *page = skb_frag_page(frag); 4121 4122 __xdp_return(page_address(page), mem_info, false, NULL); 4123 } 4124 4125 out: 4126 return release; 4127 } 4128 4129 static int bpf_xdp_frags_shrink_tail(struct xdp_buff *xdp, int offset) 4130 { 4131 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); 4132 int i, n_frags_free = 0, len_free = 0; 4133 4134 if (unlikely(offset > (int)xdp_get_buff_len(xdp) - ETH_HLEN)) 4135 return -EINVAL; 4136 4137 for (i = sinfo->nr_frags - 1; i >= 0 && offset > 0; i--) { 4138 skb_frag_t *frag = &sinfo->frags[i]; 4139 int shrink = min_t(int, offset, skb_frag_size(frag)); 4140 4141 len_free += shrink; 4142 offset -= shrink; 4143 if (bpf_xdp_shrink_data(xdp, frag, shrink)) { 4144 n_frags_free++; 4145 } else { 4146 skb_frag_size_sub(frag, shrink); 4147 break; 4148 } 4149 } 4150 sinfo->nr_frags -= n_frags_free; 4151 sinfo->xdp_frags_size -= len_free; 4152 4153 if (unlikely(!sinfo->nr_frags)) { 4154 xdp_buff_clear_frags_flag(xdp); 4155 xdp->data_end -= offset; 4156 } 4157 4158 return 0; 4159 } 4160 4161 BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset) 4162 { 4163 void *data_hard_end = xdp_data_hard_end(xdp); /* use xdp->frame_sz */ 4164 void *data_end = xdp->data_end + offset; 4165 4166 if (unlikely(xdp_buff_has_frags(xdp))) { /* non-linear xdp buff */ 4167 if (offset < 0) 4168 return bpf_xdp_frags_shrink_tail(xdp, -offset); 4169 4170 return bpf_xdp_frags_increase_tail(xdp, offset); 4171 } 4172 4173 /* Notice that xdp_data_hard_end have reserved some tailroom */ 4174 if (unlikely(data_end > data_hard_end)) 4175 return -EINVAL; 4176 4177 if (unlikely(data_end < xdp->data + ETH_HLEN)) 4178 return -EINVAL; 4179 4180 /* Clear memory area on grow, can contain uninit kernel memory */ 4181 if (offset > 0) 4182 memset(xdp->data_end, 0, offset); 4183 4184 xdp->data_end = data_end; 4185 4186 return 0; 4187 } 4188 4189 static const struct bpf_func_proto bpf_xdp_adjust_tail_proto = { 4190 .func = bpf_xdp_adjust_tail, 4191 .gpl_only = false, 4192 .ret_type = RET_INTEGER, 4193 .arg1_type = ARG_PTR_TO_CTX, 4194 .arg2_type = ARG_ANYTHING, 4195 }; 4196 4197 BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset) 4198 { 4199 void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); 4200 void *meta = xdp->data_meta + offset; 4201 unsigned long metalen = xdp->data - meta; 4202 4203 if (xdp_data_meta_unsupported(xdp)) 4204 return -ENOTSUPP; 4205 if (unlikely(meta < xdp_frame_end || 4206 meta > xdp->data)) 4207 return -EINVAL; 4208 if (unlikely(xdp_metalen_invalid(metalen))) 4209 return -EACCES; 4210 4211 xdp->data_meta = meta; 4212 4213 return 0; 4214 } 4215 4216 static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = { 4217 .func = bpf_xdp_adjust_meta, 4218 .gpl_only = false, 4219 .ret_type = RET_INTEGER, 4220 .arg1_type = ARG_PTR_TO_CTX, 4221 .arg2_type = ARG_ANYTHING, 4222 }; 4223 4224 /** 4225 * DOC: xdp redirect 4226 * 4227 * XDP_REDIRECT works by a three-step process, implemented in the functions 4228 * below: 4229 * 4230 * 1. The bpf_redirect() and bpf_redirect_map() helpers will lookup the target 4231 * of the redirect and store it (along with some other metadata) in a per-CPU 4232 * struct bpf_redirect_info. 4233 * 4234 * 2. When the program returns the XDP_REDIRECT return code, the driver will 4235 * call xdp_do_redirect() which will use the information in struct 4236 * bpf_redirect_info to actually enqueue the frame into a map type-specific 4237 * bulk queue structure. 4238 * 4239 * 3. Before exiting its NAPI poll loop, the driver will call 4240 * xdp_do_flush(), which will flush all the different bulk queues, 4241 * thus completing the redirect. Note that xdp_do_flush() must be 4242 * called before napi_complete_done() in the driver, as the 4243 * XDP_REDIRECT logic relies on being inside a single NAPI instance 4244 * through to the xdp_do_flush() call for RCU protection of all 4245 * in-kernel data structures. 4246 */ 4247 /* 4248 * Pointers to the map entries will be kept around for this whole sequence of 4249 * steps, protected by RCU. However, there is no top-level rcu_read_lock() in 4250 * the core code; instead, the RCU protection relies on everything happening 4251 * inside a single NAPI poll sequence, which means it's between a pair of calls 4252 * to local_bh_disable()/local_bh_enable(). 4253 * 4254 * The map entries are marked as __rcu and the map code makes sure to 4255 * dereference those pointers with rcu_dereference_check() in a way that works 4256 * for both sections that to hold an rcu_read_lock() and sections that are 4257 * called from NAPI without a separate rcu_read_lock(). The code below does not 4258 * use RCU annotations, but relies on those in the map code. 4259 */ 4260 void xdp_do_flush(void) 4261 { 4262 __dev_flush(); 4263 __cpu_map_flush(); 4264 __xsk_map_flush(); 4265 } 4266 EXPORT_SYMBOL_GPL(xdp_do_flush); 4267 4268 void bpf_clear_redirect_map(struct bpf_map *map) 4269 { 4270 struct bpf_redirect_info *ri; 4271 int cpu; 4272 4273 for_each_possible_cpu(cpu) { 4274 ri = per_cpu_ptr(&bpf_redirect_info, cpu); 4275 /* Avoid polluting remote cacheline due to writes if 4276 * not needed. Once we pass this test, we need the 4277 * cmpxchg() to make sure it hasn't been changed in 4278 * the meantime by remote CPU. 4279 */ 4280 if (unlikely(READ_ONCE(ri->map) == map)) 4281 cmpxchg(&ri->map, map, NULL); 4282 } 4283 } 4284 4285 DEFINE_STATIC_KEY_FALSE(bpf_master_redirect_enabled_key); 4286 EXPORT_SYMBOL_GPL(bpf_master_redirect_enabled_key); 4287 4288 u32 xdp_master_redirect(struct xdp_buff *xdp) 4289 { 4290 struct net_device *master, *slave; 4291 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4292 4293 master = netdev_master_upper_dev_get_rcu(xdp->rxq->dev); 4294 slave = master->netdev_ops->ndo_xdp_get_xmit_slave(master, xdp); 4295 if (slave && slave != xdp->rxq->dev) { 4296 /* The target device is different from the receiving device, so 4297 * redirect it to the new device. 4298 * Using XDP_REDIRECT gets the correct behaviour from XDP enabled 4299 * drivers to unmap the packet from their rx ring. 4300 */ 4301 ri->tgt_index = slave->ifindex; 4302 ri->map_id = INT_MAX; 4303 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4304 return XDP_REDIRECT; 4305 } 4306 return XDP_TX; 4307 } 4308 EXPORT_SYMBOL_GPL(xdp_master_redirect); 4309 4310 static inline int __xdp_do_redirect_xsk(struct bpf_redirect_info *ri, 4311 struct net_device *dev, 4312 struct xdp_buff *xdp, 4313 struct bpf_prog *xdp_prog) 4314 { 4315 enum bpf_map_type map_type = ri->map_type; 4316 void *fwd = ri->tgt_value; 4317 u32 map_id = ri->map_id; 4318 int err; 4319 4320 ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */ 4321 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4322 4323 err = __xsk_map_redirect(fwd, xdp); 4324 if (unlikely(err)) 4325 goto err; 4326 4327 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index); 4328 return 0; 4329 err: 4330 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index, err); 4331 return err; 4332 } 4333 4334 static __always_inline int __xdp_do_redirect_frame(struct bpf_redirect_info *ri, 4335 struct net_device *dev, 4336 struct xdp_frame *xdpf, 4337 struct bpf_prog *xdp_prog) 4338 { 4339 enum bpf_map_type map_type = ri->map_type; 4340 void *fwd = ri->tgt_value; 4341 u32 map_id = ri->map_id; 4342 u32 flags = ri->flags; 4343 struct bpf_map *map; 4344 int err; 4345 4346 ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */ 4347 ri->flags = 0; 4348 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4349 4350 if (unlikely(!xdpf)) { 4351 err = -EOVERFLOW; 4352 goto err; 4353 } 4354 4355 switch (map_type) { 4356 case BPF_MAP_TYPE_DEVMAP: 4357 fallthrough; 4358 case BPF_MAP_TYPE_DEVMAP_HASH: 4359 if (unlikely(flags & BPF_F_BROADCAST)) { 4360 map = READ_ONCE(ri->map); 4361 4362 /* The map pointer is cleared when the map is being torn 4363 * down by bpf_clear_redirect_map() 4364 */ 4365 if (unlikely(!map)) { 4366 err = -ENOENT; 4367 break; 4368 } 4369 4370 WRITE_ONCE(ri->map, NULL); 4371 err = dev_map_enqueue_multi(xdpf, dev, map, 4372 flags & BPF_F_EXCLUDE_INGRESS); 4373 } else { 4374 err = dev_map_enqueue(fwd, xdpf, dev); 4375 } 4376 break; 4377 case BPF_MAP_TYPE_CPUMAP: 4378 err = cpu_map_enqueue(fwd, xdpf, dev); 4379 break; 4380 case BPF_MAP_TYPE_UNSPEC: 4381 if (map_id == INT_MAX) { 4382 fwd = dev_get_by_index_rcu(dev_net(dev), ri->tgt_index); 4383 if (unlikely(!fwd)) { 4384 err = -EINVAL; 4385 break; 4386 } 4387 err = dev_xdp_enqueue(fwd, xdpf, dev); 4388 break; 4389 } 4390 fallthrough; 4391 default: 4392 err = -EBADRQC; 4393 } 4394 4395 if (unlikely(err)) 4396 goto err; 4397 4398 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index); 4399 return 0; 4400 err: 4401 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index, err); 4402 return err; 4403 } 4404 4405 int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp, 4406 struct bpf_prog *xdp_prog) 4407 { 4408 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4409 enum bpf_map_type map_type = ri->map_type; 4410 4411 if (map_type == BPF_MAP_TYPE_XSKMAP) 4412 return __xdp_do_redirect_xsk(ri, dev, xdp, xdp_prog); 4413 4414 return __xdp_do_redirect_frame(ri, dev, xdp_convert_buff_to_frame(xdp), 4415 xdp_prog); 4416 } 4417 EXPORT_SYMBOL_GPL(xdp_do_redirect); 4418 4419 int xdp_do_redirect_frame(struct net_device *dev, struct xdp_buff *xdp, 4420 struct xdp_frame *xdpf, struct bpf_prog *xdp_prog) 4421 { 4422 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4423 enum bpf_map_type map_type = ri->map_type; 4424 4425 if (map_type == BPF_MAP_TYPE_XSKMAP) 4426 return __xdp_do_redirect_xsk(ri, dev, xdp, xdp_prog); 4427 4428 return __xdp_do_redirect_frame(ri, dev, xdpf, xdp_prog); 4429 } 4430 EXPORT_SYMBOL_GPL(xdp_do_redirect_frame); 4431 4432 static int xdp_do_generic_redirect_map(struct net_device *dev, 4433 struct sk_buff *skb, 4434 struct xdp_buff *xdp, 4435 struct bpf_prog *xdp_prog, void *fwd, 4436 enum bpf_map_type map_type, u32 map_id, 4437 u32 flags) 4438 { 4439 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4440 struct bpf_map *map; 4441 int err; 4442 4443 switch (map_type) { 4444 case BPF_MAP_TYPE_DEVMAP: 4445 fallthrough; 4446 case BPF_MAP_TYPE_DEVMAP_HASH: 4447 if (unlikely(flags & BPF_F_BROADCAST)) { 4448 map = READ_ONCE(ri->map); 4449 4450 /* The map pointer is cleared when the map is being torn 4451 * down by bpf_clear_redirect_map() 4452 */ 4453 if (unlikely(!map)) { 4454 err = -ENOENT; 4455 break; 4456 } 4457 4458 WRITE_ONCE(ri->map, NULL); 4459 err = dev_map_redirect_multi(dev, skb, xdp_prog, map, 4460 flags & BPF_F_EXCLUDE_INGRESS); 4461 } else { 4462 err = dev_map_generic_redirect(fwd, skb, xdp_prog); 4463 } 4464 if (unlikely(err)) 4465 goto err; 4466 break; 4467 case BPF_MAP_TYPE_XSKMAP: 4468 err = xsk_generic_rcv(fwd, xdp); 4469 if (err) 4470 goto err; 4471 consume_skb(skb); 4472 break; 4473 case BPF_MAP_TYPE_CPUMAP: 4474 err = cpu_map_generic_redirect(fwd, skb); 4475 if (unlikely(err)) 4476 goto err; 4477 break; 4478 default: 4479 err = -EBADRQC; 4480 goto err; 4481 } 4482 4483 _trace_xdp_redirect_map(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index); 4484 return 0; 4485 err: 4486 _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index, err); 4487 return err; 4488 } 4489 4490 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb, 4491 struct xdp_buff *xdp, struct bpf_prog *xdp_prog) 4492 { 4493 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4494 enum bpf_map_type map_type = ri->map_type; 4495 void *fwd = ri->tgt_value; 4496 u32 map_id = ri->map_id; 4497 u32 flags = ri->flags; 4498 int err; 4499 4500 ri->map_id = 0; /* Valid map id idr range: [1,INT_MAX[ */ 4501 ri->flags = 0; 4502 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4503 4504 if (map_type == BPF_MAP_TYPE_UNSPEC && map_id == INT_MAX) { 4505 fwd = dev_get_by_index_rcu(dev_net(dev), ri->tgt_index); 4506 if (unlikely(!fwd)) { 4507 err = -EINVAL; 4508 goto err; 4509 } 4510 4511 err = xdp_ok_fwd_dev(fwd, skb->len); 4512 if (unlikely(err)) 4513 goto err; 4514 4515 skb->dev = fwd; 4516 _trace_xdp_redirect(dev, xdp_prog, ri->tgt_index); 4517 generic_xdp_tx(skb, xdp_prog); 4518 return 0; 4519 } 4520 4521 return xdp_do_generic_redirect_map(dev, skb, xdp, xdp_prog, fwd, map_type, map_id, flags); 4522 err: 4523 _trace_xdp_redirect_err(dev, xdp_prog, ri->tgt_index, err); 4524 return err; 4525 } 4526 4527 BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags) 4528 { 4529 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 4530 4531 if (unlikely(flags)) 4532 return XDP_ABORTED; 4533 4534 /* NB! Map type UNSPEC and map_id == INT_MAX (never generated 4535 * by map_idr) is used for ifindex based XDP redirect. 4536 */ 4537 ri->tgt_index = ifindex; 4538 ri->map_id = INT_MAX; 4539 ri->map_type = BPF_MAP_TYPE_UNSPEC; 4540 4541 return XDP_REDIRECT; 4542 } 4543 4544 static const struct bpf_func_proto bpf_xdp_redirect_proto = { 4545 .func = bpf_xdp_redirect, 4546 .gpl_only = false, 4547 .ret_type = RET_INTEGER, 4548 .arg1_type = ARG_ANYTHING, 4549 .arg2_type = ARG_ANYTHING, 4550 }; 4551 4552 BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u64, key, 4553 u64, flags) 4554 { 4555 return map->ops->map_redirect(map, key, flags); 4556 } 4557 4558 static const struct bpf_func_proto bpf_xdp_redirect_map_proto = { 4559 .func = bpf_xdp_redirect_map, 4560 .gpl_only = false, 4561 .ret_type = RET_INTEGER, 4562 .arg1_type = ARG_CONST_MAP_PTR, 4563 .arg2_type = ARG_ANYTHING, 4564 .arg3_type = ARG_ANYTHING, 4565 }; 4566 4567 static unsigned long bpf_skb_copy(void *dst_buff, const void *skb, 4568 unsigned long off, unsigned long len) 4569 { 4570 void *ptr = skb_header_pointer(skb, off, len, dst_buff); 4571 4572 if (unlikely(!ptr)) 4573 return len; 4574 if (ptr != dst_buff) 4575 memcpy(dst_buff, ptr, len); 4576 4577 return 0; 4578 } 4579 4580 BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map, 4581 u64, flags, void *, meta, u64, meta_size) 4582 { 4583 u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32; 4584 4585 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) 4586 return -EINVAL; 4587 if (unlikely(!skb || skb_size > skb->len)) 4588 return -EFAULT; 4589 4590 return bpf_event_output(map, flags, meta, meta_size, skb, skb_size, 4591 bpf_skb_copy); 4592 } 4593 4594 static const struct bpf_func_proto bpf_skb_event_output_proto = { 4595 .func = bpf_skb_event_output, 4596 .gpl_only = true, 4597 .ret_type = RET_INTEGER, 4598 .arg1_type = ARG_PTR_TO_CTX, 4599 .arg2_type = ARG_CONST_MAP_PTR, 4600 .arg3_type = ARG_ANYTHING, 4601 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4602 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4603 }; 4604 4605 BTF_ID_LIST_SINGLE(bpf_skb_output_btf_ids, struct, sk_buff) 4606 4607 const struct bpf_func_proto bpf_skb_output_proto = { 4608 .func = bpf_skb_event_output, 4609 .gpl_only = true, 4610 .ret_type = RET_INTEGER, 4611 .arg1_type = ARG_PTR_TO_BTF_ID, 4612 .arg1_btf_id = &bpf_skb_output_btf_ids[0], 4613 .arg2_type = ARG_CONST_MAP_PTR, 4614 .arg3_type = ARG_ANYTHING, 4615 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4616 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 4617 }; 4618 4619 static unsigned short bpf_tunnel_key_af(u64 flags) 4620 { 4621 return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET; 4622 } 4623 4624 BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to, 4625 u32, size, u64, flags) 4626 { 4627 const struct ip_tunnel_info *info = skb_tunnel_info(skb); 4628 u8 compat[sizeof(struct bpf_tunnel_key)]; 4629 void *to_orig = to; 4630 int err; 4631 4632 if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6 | 4633 BPF_F_TUNINFO_FLAGS)))) { 4634 err = -EINVAL; 4635 goto err_clear; 4636 } 4637 if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) { 4638 err = -EPROTO; 4639 goto err_clear; 4640 } 4641 if (unlikely(size != sizeof(struct bpf_tunnel_key))) { 4642 err = -EINVAL; 4643 switch (size) { 4644 case offsetof(struct bpf_tunnel_key, local_ipv6[0]): 4645 case offsetof(struct bpf_tunnel_key, tunnel_label): 4646 case offsetof(struct bpf_tunnel_key, tunnel_ext): 4647 goto set_compat; 4648 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): 4649 /* Fixup deprecated structure layouts here, so we have 4650 * a common path later on. 4651 */ 4652 if (ip_tunnel_info_af(info) != AF_INET) 4653 goto err_clear; 4654 set_compat: 4655 to = (struct bpf_tunnel_key *)compat; 4656 break; 4657 default: 4658 goto err_clear; 4659 } 4660 } 4661 4662 to->tunnel_id = be64_to_cpu(info->key.tun_id); 4663 to->tunnel_tos = info->key.tos; 4664 to->tunnel_ttl = info->key.ttl; 4665 if (flags & BPF_F_TUNINFO_FLAGS) 4666 to->tunnel_flags = info->key.tun_flags; 4667 else 4668 to->tunnel_ext = 0; 4669 4670 if (flags & BPF_F_TUNINFO_IPV6) { 4671 memcpy(to->remote_ipv6, &info->key.u.ipv6.src, 4672 sizeof(to->remote_ipv6)); 4673 memcpy(to->local_ipv6, &info->key.u.ipv6.dst, 4674 sizeof(to->local_ipv6)); 4675 to->tunnel_label = be32_to_cpu(info->key.label); 4676 } else { 4677 to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src); 4678 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); 4679 to->local_ipv4 = be32_to_cpu(info->key.u.ipv4.dst); 4680 memset(&to->local_ipv6[1], 0, sizeof(__u32) * 3); 4681 to->tunnel_label = 0; 4682 } 4683 4684 if (unlikely(size != sizeof(struct bpf_tunnel_key))) 4685 memcpy(to_orig, to, size); 4686 4687 return 0; 4688 err_clear: 4689 memset(to_orig, 0, size); 4690 return err; 4691 } 4692 4693 static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = { 4694 .func = bpf_skb_get_tunnel_key, 4695 .gpl_only = false, 4696 .ret_type = RET_INTEGER, 4697 .arg1_type = ARG_PTR_TO_CTX, 4698 .arg2_type = ARG_PTR_TO_UNINIT_MEM, 4699 .arg3_type = ARG_CONST_SIZE, 4700 .arg4_type = ARG_ANYTHING, 4701 }; 4702 4703 BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size) 4704 { 4705 const struct ip_tunnel_info *info = skb_tunnel_info(skb); 4706 int err; 4707 4708 if (unlikely(!info || 4709 !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) { 4710 err = -ENOENT; 4711 goto err_clear; 4712 } 4713 if (unlikely(size < info->options_len)) { 4714 err = -ENOMEM; 4715 goto err_clear; 4716 } 4717 4718 ip_tunnel_info_opts_get(to, info); 4719 if (size > info->options_len) 4720 memset(to + info->options_len, 0, size - info->options_len); 4721 4722 return info->options_len; 4723 err_clear: 4724 memset(to, 0, size); 4725 return err; 4726 } 4727 4728 static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = { 4729 .func = bpf_skb_get_tunnel_opt, 4730 .gpl_only = false, 4731 .ret_type = RET_INTEGER, 4732 .arg1_type = ARG_PTR_TO_CTX, 4733 .arg2_type = ARG_PTR_TO_UNINIT_MEM, 4734 .arg3_type = ARG_CONST_SIZE, 4735 }; 4736 4737 static struct metadata_dst __percpu *md_dst; 4738 4739 BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb, 4740 const struct bpf_tunnel_key *, from, u32, size, u64, flags) 4741 { 4742 struct metadata_dst *md = this_cpu_ptr(md_dst); 4743 u8 compat[sizeof(struct bpf_tunnel_key)]; 4744 struct ip_tunnel_info *info; 4745 4746 if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX | 4747 BPF_F_DONT_FRAGMENT | BPF_F_SEQ_NUMBER | 4748 BPF_F_NO_TUNNEL_KEY))) 4749 return -EINVAL; 4750 if (unlikely(size != sizeof(struct bpf_tunnel_key))) { 4751 switch (size) { 4752 case offsetof(struct bpf_tunnel_key, local_ipv6[0]): 4753 case offsetof(struct bpf_tunnel_key, tunnel_label): 4754 case offsetof(struct bpf_tunnel_key, tunnel_ext): 4755 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): 4756 /* Fixup deprecated structure layouts here, so we have 4757 * a common path later on. 4758 */ 4759 memcpy(compat, from, size); 4760 memset(compat + size, 0, sizeof(compat) - size); 4761 from = (const struct bpf_tunnel_key *) compat; 4762 break; 4763 default: 4764 return -EINVAL; 4765 } 4766 } 4767 if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) || 4768 from->tunnel_ext)) 4769 return -EINVAL; 4770 4771 skb_dst_drop(skb); 4772 dst_hold((struct dst_entry *) md); 4773 skb_dst_set(skb, (struct dst_entry *) md); 4774 4775 info = &md->u.tun_info; 4776 memset(info, 0, sizeof(*info)); 4777 info->mode = IP_TUNNEL_INFO_TX; 4778 4779 info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE; 4780 if (flags & BPF_F_DONT_FRAGMENT) 4781 info->key.tun_flags |= TUNNEL_DONT_FRAGMENT; 4782 if (flags & BPF_F_ZERO_CSUM_TX) 4783 info->key.tun_flags &= ~TUNNEL_CSUM; 4784 if (flags & BPF_F_SEQ_NUMBER) 4785 info->key.tun_flags |= TUNNEL_SEQ; 4786 if (flags & BPF_F_NO_TUNNEL_KEY) 4787 info->key.tun_flags &= ~TUNNEL_KEY; 4788 4789 info->key.tun_id = cpu_to_be64(from->tunnel_id); 4790 info->key.tos = from->tunnel_tos; 4791 info->key.ttl = from->tunnel_ttl; 4792 4793 if (flags & BPF_F_TUNINFO_IPV6) { 4794 info->mode |= IP_TUNNEL_INFO_IPV6; 4795 memcpy(&info->key.u.ipv6.dst, from->remote_ipv6, 4796 sizeof(from->remote_ipv6)); 4797 memcpy(&info->key.u.ipv6.src, from->local_ipv6, 4798 sizeof(from->local_ipv6)); 4799 info->key.label = cpu_to_be32(from->tunnel_label) & 4800 IPV6_FLOWLABEL_MASK; 4801 } else { 4802 info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4); 4803 info->key.u.ipv4.src = cpu_to_be32(from->local_ipv4); 4804 info->key.flow_flags = FLOWI_FLAG_ANYSRC; 4805 } 4806 4807 return 0; 4808 } 4809 4810 static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = { 4811 .func = bpf_skb_set_tunnel_key, 4812 .gpl_only = false, 4813 .ret_type = RET_INTEGER, 4814 .arg1_type = ARG_PTR_TO_CTX, 4815 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4816 .arg3_type = ARG_CONST_SIZE, 4817 .arg4_type = ARG_ANYTHING, 4818 }; 4819 4820 BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb, 4821 const u8 *, from, u32, size) 4822 { 4823 struct ip_tunnel_info *info = skb_tunnel_info(skb); 4824 const struct metadata_dst *md = this_cpu_ptr(md_dst); 4825 4826 if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1)))) 4827 return -EINVAL; 4828 if (unlikely(size > IP_TUNNEL_OPTS_MAX)) 4829 return -ENOMEM; 4830 4831 ip_tunnel_info_opts_set(info, from, size, TUNNEL_OPTIONS_PRESENT); 4832 4833 return 0; 4834 } 4835 4836 static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = { 4837 .func = bpf_skb_set_tunnel_opt, 4838 .gpl_only = false, 4839 .ret_type = RET_INTEGER, 4840 .arg1_type = ARG_PTR_TO_CTX, 4841 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 4842 .arg3_type = ARG_CONST_SIZE, 4843 }; 4844 4845 static const struct bpf_func_proto * 4846 bpf_get_skb_set_tunnel_proto(enum bpf_func_id which) 4847 { 4848 if (!md_dst) { 4849 struct metadata_dst __percpu *tmp; 4850 4851 tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX, 4852 METADATA_IP_TUNNEL, 4853 GFP_KERNEL); 4854 if (!tmp) 4855 return NULL; 4856 if (cmpxchg(&md_dst, NULL, tmp)) 4857 metadata_dst_free_percpu(tmp); 4858 } 4859 4860 switch (which) { 4861 case BPF_FUNC_skb_set_tunnel_key: 4862 return &bpf_skb_set_tunnel_key_proto; 4863 case BPF_FUNC_skb_set_tunnel_opt: 4864 return &bpf_skb_set_tunnel_opt_proto; 4865 default: 4866 return NULL; 4867 } 4868 } 4869 4870 BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map, 4871 u32, idx) 4872 { 4873 struct bpf_array *array = container_of(map, struct bpf_array, map); 4874 struct cgroup *cgrp; 4875 struct sock *sk; 4876 4877 sk = skb_to_full_sk(skb); 4878 if (!sk || !sk_fullsock(sk)) 4879 return -ENOENT; 4880 if (unlikely(idx >= array->map.max_entries)) 4881 return -E2BIG; 4882 4883 cgrp = READ_ONCE(array->ptrs[idx]); 4884 if (unlikely(!cgrp)) 4885 return -EAGAIN; 4886 4887 return sk_under_cgroup_hierarchy(sk, cgrp); 4888 } 4889 4890 static const struct bpf_func_proto bpf_skb_under_cgroup_proto = { 4891 .func = bpf_skb_under_cgroup, 4892 .gpl_only = false, 4893 .ret_type = RET_INTEGER, 4894 .arg1_type = ARG_PTR_TO_CTX, 4895 .arg2_type = ARG_CONST_MAP_PTR, 4896 .arg3_type = ARG_ANYTHING, 4897 }; 4898 4899 #ifdef CONFIG_SOCK_CGROUP_DATA 4900 static inline u64 __bpf_sk_cgroup_id(struct sock *sk) 4901 { 4902 struct cgroup *cgrp; 4903 4904 sk = sk_to_full_sk(sk); 4905 if (!sk || !sk_fullsock(sk)) 4906 return 0; 4907 4908 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); 4909 return cgroup_id(cgrp); 4910 } 4911 4912 BPF_CALL_1(bpf_skb_cgroup_id, const struct sk_buff *, skb) 4913 { 4914 return __bpf_sk_cgroup_id(skb->sk); 4915 } 4916 4917 static const struct bpf_func_proto bpf_skb_cgroup_id_proto = { 4918 .func = bpf_skb_cgroup_id, 4919 .gpl_only = false, 4920 .ret_type = RET_INTEGER, 4921 .arg1_type = ARG_PTR_TO_CTX, 4922 }; 4923 4924 static inline u64 __bpf_sk_ancestor_cgroup_id(struct sock *sk, 4925 int ancestor_level) 4926 { 4927 struct cgroup *ancestor; 4928 struct cgroup *cgrp; 4929 4930 sk = sk_to_full_sk(sk); 4931 if (!sk || !sk_fullsock(sk)) 4932 return 0; 4933 4934 cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); 4935 ancestor = cgroup_ancestor(cgrp, ancestor_level); 4936 if (!ancestor) 4937 return 0; 4938 4939 return cgroup_id(ancestor); 4940 } 4941 4942 BPF_CALL_2(bpf_skb_ancestor_cgroup_id, const struct sk_buff *, skb, int, 4943 ancestor_level) 4944 { 4945 return __bpf_sk_ancestor_cgroup_id(skb->sk, ancestor_level); 4946 } 4947 4948 static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto = { 4949 .func = bpf_skb_ancestor_cgroup_id, 4950 .gpl_only = false, 4951 .ret_type = RET_INTEGER, 4952 .arg1_type = ARG_PTR_TO_CTX, 4953 .arg2_type = ARG_ANYTHING, 4954 }; 4955 4956 BPF_CALL_1(bpf_sk_cgroup_id, struct sock *, sk) 4957 { 4958 return __bpf_sk_cgroup_id(sk); 4959 } 4960 4961 static const struct bpf_func_proto bpf_sk_cgroup_id_proto = { 4962 .func = bpf_sk_cgroup_id, 4963 .gpl_only = false, 4964 .ret_type = RET_INTEGER, 4965 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 4966 }; 4967 4968 BPF_CALL_2(bpf_sk_ancestor_cgroup_id, struct sock *, sk, int, ancestor_level) 4969 { 4970 return __bpf_sk_ancestor_cgroup_id(sk, ancestor_level); 4971 } 4972 4973 static const struct bpf_func_proto bpf_sk_ancestor_cgroup_id_proto = { 4974 .func = bpf_sk_ancestor_cgroup_id, 4975 .gpl_only = false, 4976 .ret_type = RET_INTEGER, 4977 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 4978 .arg2_type = ARG_ANYTHING, 4979 }; 4980 #endif 4981 4982 static unsigned long bpf_xdp_copy(void *dst, const void *ctx, 4983 unsigned long off, unsigned long len) 4984 { 4985 struct xdp_buff *xdp = (struct xdp_buff *)ctx; 4986 4987 bpf_xdp_copy_buf(xdp, off, dst, len, false); 4988 return 0; 4989 } 4990 4991 BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map, 4992 u64, flags, void *, meta, u64, meta_size) 4993 { 4994 u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32; 4995 4996 if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) 4997 return -EINVAL; 4998 4999 if (unlikely(!xdp || xdp_size > xdp_get_buff_len(xdp))) 5000 return -EFAULT; 5001 5002 return bpf_event_output(map, flags, meta, meta_size, xdp, 5003 xdp_size, bpf_xdp_copy); 5004 } 5005 5006 static const struct bpf_func_proto bpf_xdp_event_output_proto = { 5007 .func = bpf_xdp_event_output, 5008 .gpl_only = true, 5009 .ret_type = RET_INTEGER, 5010 .arg1_type = ARG_PTR_TO_CTX, 5011 .arg2_type = ARG_CONST_MAP_PTR, 5012 .arg3_type = ARG_ANYTHING, 5013 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5014 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 5015 }; 5016 5017 BTF_ID_LIST_SINGLE(bpf_xdp_output_btf_ids, struct, xdp_buff) 5018 5019 const struct bpf_func_proto bpf_xdp_output_proto = { 5020 .func = bpf_xdp_event_output, 5021 .gpl_only = true, 5022 .ret_type = RET_INTEGER, 5023 .arg1_type = ARG_PTR_TO_BTF_ID, 5024 .arg1_btf_id = &bpf_xdp_output_btf_ids[0], 5025 .arg2_type = ARG_CONST_MAP_PTR, 5026 .arg3_type = ARG_ANYTHING, 5027 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5028 .arg5_type = ARG_CONST_SIZE_OR_ZERO, 5029 }; 5030 5031 BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb) 5032 { 5033 return skb->sk ? __sock_gen_cookie(skb->sk) : 0; 5034 } 5035 5036 static const struct bpf_func_proto bpf_get_socket_cookie_proto = { 5037 .func = bpf_get_socket_cookie, 5038 .gpl_only = false, 5039 .ret_type = RET_INTEGER, 5040 .arg1_type = ARG_PTR_TO_CTX, 5041 }; 5042 5043 BPF_CALL_1(bpf_get_socket_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx) 5044 { 5045 return __sock_gen_cookie(ctx->sk); 5046 } 5047 5048 static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto = { 5049 .func = bpf_get_socket_cookie_sock_addr, 5050 .gpl_only = false, 5051 .ret_type = RET_INTEGER, 5052 .arg1_type = ARG_PTR_TO_CTX, 5053 }; 5054 5055 BPF_CALL_1(bpf_get_socket_cookie_sock, struct sock *, ctx) 5056 { 5057 return __sock_gen_cookie(ctx); 5058 } 5059 5060 static const struct bpf_func_proto bpf_get_socket_cookie_sock_proto = { 5061 .func = bpf_get_socket_cookie_sock, 5062 .gpl_only = false, 5063 .ret_type = RET_INTEGER, 5064 .arg1_type = ARG_PTR_TO_CTX, 5065 }; 5066 5067 BPF_CALL_1(bpf_get_socket_ptr_cookie, struct sock *, sk) 5068 { 5069 return sk ? sock_gen_cookie(sk) : 0; 5070 } 5071 5072 const struct bpf_func_proto bpf_get_socket_ptr_cookie_proto = { 5073 .func = bpf_get_socket_ptr_cookie, 5074 .gpl_only = false, 5075 .ret_type = RET_INTEGER, 5076 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON | PTR_MAYBE_NULL, 5077 }; 5078 5079 BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx) 5080 { 5081 return __sock_gen_cookie(ctx->sk); 5082 } 5083 5084 static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto = { 5085 .func = bpf_get_socket_cookie_sock_ops, 5086 .gpl_only = false, 5087 .ret_type = RET_INTEGER, 5088 .arg1_type = ARG_PTR_TO_CTX, 5089 }; 5090 5091 static u64 __bpf_get_netns_cookie(struct sock *sk) 5092 { 5093 const struct net *net = sk ? sock_net(sk) : &init_net; 5094 5095 return net->net_cookie; 5096 } 5097 5098 BPF_CALL_1(bpf_get_netns_cookie_sock, struct sock *, ctx) 5099 { 5100 return __bpf_get_netns_cookie(ctx); 5101 } 5102 5103 static const struct bpf_func_proto bpf_get_netns_cookie_sock_proto = { 5104 .func = bpf_get_netns_cookie_sock, 5105 .gpl_only = false, 5106 .ret_type = RET_INTEGER, 5107 .arg1_type = ARG_PTR_TO_CTX_OR_NULL, 5108 }; 5109 5110 BPF_CALL_1(bpf_get_netns_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx) 5111 { 5112 return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL); 5113 } 5114 5115 static const struct bpf_func_proto bpf_get_netns_cookie_sock_addr_proto = { 5116 .func = bpf_get_netns_cookie_sock_addr, 5117 .gpl_only = false, 5118 .ret_type = RET_INTEGER, 5119 .arg1_type = ARG_PTR_TO_CTX_OR_NULL, 5120 }; 5121 5122 BPF_CALL_1(bpf_get_netns_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx) 5123 { 5124 return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL); 5125 } 5126 5127 static const struct bpf_func_proto bpf_get_netns_cookie_sock_ops_proto = { 5128 .func = bpf_get_netns_cookie_sock_ops, 5129 .gpl_only = false, 5130 .ret_type = RET_INTEGER, 5131 .arg1_type = ARG_PTR_TO_CTX_OR_NULL, 5132 }; 5133 5134 BPF_CALL_1(bpf_get_netns_cookie_sk_msg, struct sk_msg *, ctx) 5135 { 5136 return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL); 5137 } 5138 5139 static const struct bpf_func_proto bpf_get_netns_cookie_sk_msg_proto = { 5140 .func = bpf_get_netns_cookie_sk_msg, 5141 .gpl_only = false, 5142 .ret_type = RET_INTEGER, 5143 .arg1_type = ARG_PTR_TO_CTX_OR_NULL, 5144 }; 5145 5146 BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb) 5147 { 5148 struct sock *sk = sk_to_full_sk(skb->sk); 5149 kuid_t kuid; 5150 5151 if (!sk || !sk_fullsock(sk)) 5152 return overflowuid; 5153 kuid = sock_net_uid(sock_net(sk), sk); 5154 return from_kuid_munged(sock_net(sk)->user_ns, kuid); 5155 } 5156 5157 static const struct bpf_func_proto bpf_get_socket_uid_proto = { 5158 .func = bpf_get_socket_uid, 5159 .gpl_only = false, 5160 .ret_type = RET_INTEGER, 5161 .arg1_type = ARG_PTR_TO_CTX, 5162 }; 5163 5164 static int sol_socket_sockopt(struct sock *sk, int optname, 5165 char *optval, int *optlen, 5166 bool getopt) 5167 { 5168 switch (optname) { 5169 case SO_REUSEADDR: 5170 case SO_SNDBUF: 5171 case SO_RCVBUF: 5172 case SO_KEEPALIVE: 5173 case SO_PRIORITY: 5174 case SO_REUSEPORT: 5175 case SO_RCVLOWAT: 5176 case SO_MARK: 5177 case SO_MAX_PACING_RATE: 5178 case SO_BINDTOIFINDEX: 5179 case SO_TXREHASH: 5180 if (*optlen != sizeof(int)) 5181 return -EINVAL; 5182 break; 5183 case SO_BINDTODEVICE: 5184 break; 5185 default: 5186 return -EINVAL; 5187 } 5188 5189 if (getopt) { 5190 if (optname == SO_BINDTODEVICE) 5191 return -EINVAL; 5192 return sk_getsockopt(sk, SOL_SOCKET, optname, 5193 KERNEL_SOCKPTR(optval), 5194 KERNEL_SOCKPTR(optlen)); 5195 } 5196 5197 return sk_setsockopt(sk, SOL_SOCKET, optname, 5198 KERNEL_SOCKPTR(optval), *optlen); 5199 } 5200 5201 static int bpf_sol_tcp_setsockopt(struct sock *sk, int optname, 5202 char *optval, int optlen) 5203 { 5204 struct tcp_sock *tp = tcp_sk(sk); 5205 unsigned long timeout; 5206 int val; 5207 5208 if (optlen != sizeof(int)) 5209 return -EINVAL; 5210 5211 val = *(int *)optval; 5212 5213 /* Only some options are supported */ 5214 switch (optname) { 5215 case TCP_BPF_IW: 5216 if (val <= 0 || tp->data_segs_out > tp->syn_data) 5217 return -EINVAL; 5218 tcp_snd_cwnd_set(tp, val); 5219 break; 5220 case TCP_BPF_SNDCWND_CLAMP: 5221 if (val <= 0) 5222 return -EINVAL; 5223 tp->snd_cwnd_clamp = val; 5224 tp->snd_ssthresh = val; 5225 break; 5226 case TCP_BPF_DELACK_MAX: 5227 timeout = usecs_to_jiffies(val); 5228 if (timeout > TCP_DELACK_MAX || 5229 timeout < TCP_TIMEOUT_MIN) 5230 return -EINVAL; 5231 inet_csk(sk)->icsk_delack_max = timeout; 5232 break; 5233 case TCP_BPF_RTO_MIN: 5234 timeout = usecs_to_jiffies(val); 5235 if (timeout > TCP_RTO_MIN || 5236 timeout < TCP_TIMEOUT_MIN) 5237 return -EINVAL; 5238 inet_csk(sk)->icsk_rto_min = timeout; 5239 break; 5240 default: 5241 return -EINVAL; 5242 } 5243 5244 return 0; 5245 } 5246 5247 static int sol_tcp_sockopt_congestion(struct sock *sk, char *optval, 5248 int *optlen, bool getopt) 5249 { 5250 struct tcp_sock *tp; 5251 int ret; 5252 5253 if (*optlen < 2) 5254 return -EINVAL; 5255 5256 if (getopt) { 5257 if (!inet_csk(sk)->icsk_ca_ops) 5258 return -EINVAL; 5259 /* BPF expects NULL-terminated tcp-cc string */ 5260 optval[--(*optlen)] = '\0'; 5261 return do_tcp_getsockopt(sk, SOL_TCP, TCP_CONGESTION, 5262 KERNEL_SOCKPTR(optval), 5263 KERNEL_SOCKPTR(optlen)); 5264 } 5265 5266 /* "cdg" is the only cc that alloc a ptr 5267 * in inet_csk_ca area. The bpf-tcp-cc may 5268 * overwrite this ptr after switching to cdg. 5269 */ 5270 if (*optlen >= sizeof("cdg") - 1 && !strncmp("cdg", optval, *optlen)) 5271 return -ENOTSUPP; 5272 5273 /* It stops this looping 5274 * 5275 * .init => bpf_setsockopt(tcp_cc) => .init => 5276 * bpf_setsockopt(tcp_cc)" => .init => .... 5277 * 5278 * The second bpf_setsockopt(tcp_cc) is not allowed 5279 * in order to break the loop when both .init 5280 * are the same bpf prog. 5281 * 5282 * This applies even the second bpf_setsockopt(tcp_cc) 5283 * does not cause a loop. This limits only the first 5284 * '.init' can call bpf_setsockopt(TCP_CONGESTION) to 5285 * pick a fallback cc (eg. peer does not support ECN) 5286 * and the second '.init' cannot fallback to 5287 * another. 5288 */ 5289 tp = tcp_sk(sk); 5290 if (tp->bpf_chg_cc_inprogress) 5291 return -EBUSY; 5292 5293 tp->bpf_chg_cc_inprogress = 1; 5294 ret = do_tcp_setsockopt(sk, SOL_TCP, TCP_CONGESTION, 5295 KERNEL_SOCKPTR(optval), *optlen); 5296 tp->bpf_chg_cc_inprogress = 0; 5297 return ret; 5298 } 5299 5300 static int sol_tcp_sockopt(struct sock *sk, int optname, 5301 char *optval, int *optlen, 5302 bool getopt) 5303 { 5304 if (sk->sk_protocol != IPPROTO_TCP) 5305 return -EINVAL; 5306 5307 switch (optname) { 5308 case TCP_NODELAY: 5309 case TCP_MAXSEG: 5310 case TCP_KEEPIDLE: 5311 case TCP_KEEPINTVL: 5312 case TCP_KEEPCNT: 5313 case TCP_SYNCNT: 5314 case TCP_WINDOW_CLAMP: 5315 case TCP_THIN_LINEAR_TIMEOUTS: 5316 case TCP_USER_TIMEOUT: 5317 case TCP_NOTSENT_LOWAT: 5318 case TCP_SAVE_SYN: 5319 if (*optlen != sizeof(int)) 5320 return -EINVAL; 5321 break; 5322 case TCP_CONGESTION: 5323 return sol_tcp_sockopt_congestion(sk, optval, optlen, getopt); 5324 case TCP_SAVED_SYN: 5325 if (*optlen < 1) 5326 return -EINVAL; 5327 break; 5328 default: 5329 if (getopt) 5330 return -EINVAL; 5331 return bpf_sol_tcp_setsockopt(sk, optname, optval, *optlen); 5332 } 5333 5334 if (getopt) { 5335 if (optname == TCP_SAVED_SYN) { 5336 struct tcp_sock *tp = tcp_sk(sk); 5337 5338 if (!tp->saved_syn || 5339 *optlen > tcp_saved_syn_len(tp->saved_syn)) 5340 return -EINVAL; 5341 memcpy(optval, tp->saved_syn->data, *optlen); 5342 /* It cannot free tp->saved_syn here because it 5343 * does not know if the user space still needs it. 5344 */ 5345 return 0; 5346 } 5347 5348 return do_tcp_getsockopt(sk, SOL_TCP, optname, 5349 KERNEL_SOCKPTR(optval), 5350 KERNEL_SOCKPTR(optlen)); 5351 } 5352 5353 return do_tcp_setsockopt(sk, SOL_TCP, optname, 5354 KERNEL_SOCKPTR(optval), *optlen); 5355 } 5356 5357 static int sol_ip_sockopt(struct sock *sk, int optname, 5358 char *optval, int *optlen, 5359 bool getopt) 5360 { 5361 if (sk->sk_family != AF_INET) 5362 return -EINVAL; 5363 5364 switch (optname) { 5365 case IP_TOS: 5366 if (*optlen != sizeof(int)) 5367 return -EINVAL; 5368 break; 5369 default: 5370 return -EINVAL; 5371 } 5372 5373 if (getopt) 5374 return do_ip_getsockopt(sk, SOL_IP, optname, 5375 KERNEL_SOCKPTR(optval), 5376 KERNEL_SOCKPTR(optlen)); 5377 5378 return do_ip_setsockopt(sk, SOL_IP, optname, 5379 KERNEL_SOCKPTR(optval), *optlen); 5380 } 5381 5382 static int sol_ipv6_sockopt(struct sock *sk, int optname, 5383 char *optval, int *optlen, 5384 bool getopt) 5385 { 5386 if (sk->sk_family != AF_INET6) 5387 return -EINVAL; 5388 5389 switch (optname) { 5390 case IPV6_TCLASS: 5391 case IPV6_AUTOFLOWLABEL: 5392 if (*optlen != sizeof(int)) 5393 return -EINVAL; 5394 break; 5395 default: 5396 return -EINVAL; 5397 } 5398 5399 if (getopt) 5400 return ipv6_bpf_stub->ipv6_getsockopt(sk, SOL_IPV6, optname, 5401 KERNEL_SOCKPTR(optval), 5402 KERNEL_SOCKPTR(optlen)); 5403 5404 return ipv6_bpf_stub->ipv6_setsockopt(sk, SOL_IPV6, optname, 5405 KERNEL_SOCKPTR(optval), *optlen); 5406 } 5407 5408 static int __bpf_setsockopt(struct sock *sk, int level, int optname, 5409 char *optval, int optlen) 5410 { 5411 if (!sk_fullsock(sk)) 5412 return -EINVAL; 5413 5414 if (level == SOL_SOCKET) 5415 return sol_socket_sockopt(sk, optname, optval, &optlen, false); 5416 else if (IS_ENABLED(CONFIG_INET) && level == SOL_IP) 5417 return sol_ip_sockopt(sk, optname, optval, &optlen, false); 5418 else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6) 5419 return sol_ipv6_sockopt(sk, optname, optval, &optlen, false); 5420 else if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP) 5421 return sol_tcp_sockopt(sk, optname, optval, &optlen, false); 5422 5423 return -EINVAL; 5424 } 5425 5426 static int _bpf_setsockopt(struct sock *sk, int level, int optname, 5427 char *optval, int optlen) 5428 { 5429 if (sk_fullsock(sk)) 5430 sock_owned_by_me(sk); 5431 return __bpf_setsockopt(sk, level, optname, optval, optlen); 5432 } 5433 5434 static int __bpf_getsockopt(struct sock *sk, int level, int optname, 5435 char *optval, int optlen) 5436 { 5437 int err, saved_optlen = optlen; 5438 5439 if (!sk_fullsock(sk)) { 5440 err = -EINVAL; 5441 goto done; 5442 } 5443 5444 if (level == SOL_SOCKET) 5445 err = sol_socket_sockopt(sk, optname, optval, &optlen, true); 5446 else if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP) 5447 err = sol_tcp_sockopt(sk, optname, optval, &optlen, true); 5448 else if (IS_ENABLED(CONFIG_INET) && level == SOL_IP) 5449 err = sol_ip_sockopt(sk, optname, optval, &optlen, true); 5450 else if (IS_ENABLED(CONFIG_IPV6) && level == SOL_IPV6) 5451 err = sol_ipv6_sockopt(sk, optname, optval, &optlen, true); 5452 else 5453 err = -EINVAL; 5454 5455 done: 5456 if (err) 5457 optlen = 0; 5458 if (optlen < saved_optlen) 5459 memset(optval + optlen, 0, saved_optlen - optlen); 5460 return err; 5461 } 5462 5463 static int _bpf_getsockopt(struct sock *sk, int level, int optname, 5464 char *optval, int optlen) 5465 { 5466 if (sk_fullsock(sk)) 5467 sock_owned_by_me(sk); 5468 return __bpf_getsockopt(sk, level, optname, optval, optlen); 5469 } 5470 5471 BPF_CALL_5(bpf_sk_setsockopt, struct sock *, sk, int, level, 5472 int, optname, char *, optval, int, optlen) 5473 { 5474 return _bpf_setsockopt(sk, level, optname, optval, optlen); 5475 } 5476 5477 const struct bpf_func_proto bpf_sk_setsockopt_proto = { 5478 .func = bpf_sk_setsockopt, 5479 .gpl_only = false, 5480 .ret_type = RET_INTEGER, 5481 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 5482 .arg2_type = ARG_ANYTHING, 5483 .arg3_type = ARG_ANYTHING, 5484 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5485 .arg5_type = ARG_CONST_SIZE, 5486 }; 5487 5488 BPF_CALL_5(bpf_sk_getsockopt, struct sock *, sk, int, level, 5489 int, optname, char *, optval, int, optlen) 5490 { 5491 return _bpf_getsockopt(sk, level, optname, optval, optlen); 5492 } 5493 5494 const struct bpf_func_proto bpf_sk_getsockopt_proto = { 5495 .func = bpf_sk_getsockopt, 5496 .gpl_only = false, 5497 .ret_type = RET_INTEGER, 5498 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 5499 .arg2_type = ARG_ANYTHING, 5500 .arg3_type = ARG_ANYTHING, 5501 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 5502 .arg5_type = ARG_CONST_SIZE, 5503 }; 5504 5505 BPF_CALL_5(bpf_unlocked_sk_setsockopt, struct sock *, sk, int, level, 5506 int, optname, char *, optval, int, optlen) 5507 { 5508 return __bpf_setsockopt(sk, level, optname, optval, optlen); 5509 } 5510 5511 const struct bpf_func_proto bpf_unlocked_sk_setsockopt_proto = { 5512 .func = bpf_unlocked_sk_setsockopt, 5513 .gpl_only = false, 5514 .ret_type = RET_INTEGER, 5515 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 5516 .arg2_type = ARG_ANYTHING, 5517 .arg3_type = ARG_ANYTHING, 5518 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5519 .arg5_type = ARG_CONST_SIZE, 5520 }; 5521 5522 BPF_CALL_5(bpf_unlocked_sk_getsockopt, struct sock *, sk, int, level, 5523 int, optname, char *, optval, int, optlen) 5524 { 5525 return __bpf_getsockopt(sk, level, optname, optval, optlen); 5526 } 5527 5528 const struct bpf_func_proto bpf_unlocked_sk_getsockopt_proto = { 5529 .func = bpf_unlocked_sk_getsockopt, 5530 .gpl_only = false, 5531 .ret_type = RET_INTEGER, 5532 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 5533 .arg2_type = ARG_ANYTHING, 5534 .arg3_type = ARG_ANYTHING, 5535 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 5536 .arg5_type = ARG_CONST_SIZE, 5537 }; 5538 5539 BPF_CALL_5(bpf_sock_addr_setsockopt, struct bpf_sock_addr_kern *, ctx, 5540 int, level, int, optname, char *, optval, int, optlen) 5541 { 5542 return _bpf_setsockopt(ctx->sk, level, optname, optval, optlen); 5543 } 5544 5545 static const struct bpf_func_proto bpf_sock_addr_setsockopt_proto = { 5546 .func = bpf_sock_addr_setsockopt, 5547 .gpl_only = false, 5548 .ret_type = RET_INTEGER, 5549 .arg1_type = ARG_PTR_TO_CTX, 5550 .arg2_type = ARG_ANYTHING, 5551 .arg3_type = ARG_ANYTHING, 5552 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5553 .arg5_type = ARG_CONST_SIZE, 5554 }; 5555 5556 BPF_CALL_5(bpf_sock_addr_getsockopt, struct bpf_sock_addr_kern *, ctx, 5557 int, level, int, optname, char *, optval, int, optlen) 5558 { 5559 return _bpf_getsockopt(ctx->sk, level, optname, optval, optlen); 5560 } 5561 5562 static const struct bpf_func_proto bpf_sock_addr_getsockopt_proto = { 5563 .func = bpf_sock_addr_getsockopt, 5564 .gpl_only = false, 5565 .ret_type = RET_INTEGER, 5566 .arg1_type = ARG_PTR_TO_CTX, 5567 .arg2_type = ARG_ANYTHING, 5568 .arg3_type = ARG_ANYTHING, 5569 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 5570 .arg5_type = ARG_CONST_SIZE, 5571 }; 5572 5573 BPF_CALL_5(bpf_sock_ops_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, 5574 int, level, int, optname, char *, optval, int, optlen) 5575 { 5576 return _bpf_setsockopt(bpf_sock->sk, level, optname, optval, optlen); 5577 } 5578 5579 static const struct bpf_func_proto bpf_sock_ops_setsockopt_proto = { 5580 .func = bpf_sock_ops_setsockopt, 5581 .gpl_only = false, 5582 .ret_type = RET_INTEGER, 5583 .arg1_type = ARG_PTR_TO_CTX, 5584 .arg2_type = ARG_ANYTHING, 5585 .arg3_type = ARG_ANYTHING, 5586 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5587 .arg5_type = ARG_CONST_SIZE, 5588 }; 5589 5590 static int bpf_sock_ops_get_syn(struct bpf_sock_ops_kern *bpf_sock, 5591 int optname, const u8 **start) 5592 { 5593 struct sk_buff *syn_skb = bpf_sock->syn_skb; 5594 const u8 *hdr_start; 5595 int ret; 5596 5597 if (syn_skb) { 5598 /* sk is a request_sock here */ 5599 5600 if (optname == TCP_BPF_SYN) { 5601 hdr_start = syn_skb->data; 5602 ret = tcp_hdrlen(syn_skb); 5603 } else if (optname == TCP_BPF_SYN_IP) { 5604 hdr_start = skb_network_header(syn_skb); 5605 ret = skb_network_header_len(syn_skb) + 5606 tcp_hdrlen(syn_skb); 5607 } else { 5608 /* optname == TCP_BPF_SYN_MAC */ 5609 hdr_start = skb_mac_header(syn_skb); 5610 ret = skb_mac_header_len(syn_skb) + 5611 skb_network_header_len(syn_skb) + 5612 tcp_hdrlen(syn_skb); 5613 } 5614 } else { 5615 struct sock *sk = bpf_sock->sk; 5616 struct saved_syn *saved_syn; 5617 5618 if (sk->sk_state == TCP_NEW_SYN_RECV) 5619 /* synack retransmit. bpf_sock->syn_skb will 5620 * not be available. It has to resort to 5621 * saved_syn (if it is saved). 5622 */ 5623 saved_syn = inet_reqsk(sk)->saved_syn; 5624 else 5625 saved_syn = tcp_sk(sk)->saved_syn; 5626 5627 if (!saved_syn) 5628 return -ENOENT; 5629 5630 if (optname == TCP_BPF_SYN) { 5631 hdr_start = saved_syn->data + 5632 saved_syn->mac_hdrlen + 5633 saved_syn->network_hdrlen; 5634 ret = saved_syn->tcp_hdrlen; 5635 } else if (optname == TCP_BPF_SYN_IP) { 5636 hdr_start = saved_syn->data + 5637 saved_syn->mac_hdrlen; 5638 ret = saved_syn->network_hdrlen + 5639 saved_syn->tcp_hdrlen; 5640 } else { 5641 /* optname == TCP_BPF_SYN_MAC */ 5642 5643 /* TCP_SAVE_SYN may not have saved the mac hdr */ 5644 if (!saved_syn->mac_hdrlen) 5645 return -ENOENT; 5646 5647 hdr_start = saved_syn->data; 5648 ret = saved_syn->mac_hdrlen + 5649 saved_syn->network_hdrlen + 5650 saved_syn->tcp_hdrlen; 5651 } 5652 } 5653 5654 *start = hdr_start; 5655 return ret; 5656 } 5657 5658 BPF_CALL_5(bpf_sock_ops_getsockopt, struct bpf_sock_ops_kern *, bpf_sock, 5659 int, level, int, optname, char *, optval, int, optlen) 5660 { 5661 if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP && 5662 optname >= TCP_BPF_SYN && optname <= TCP_BPF_SYN_MAC) { 5663 int ret, copy_len = 0; 5664 const u8 *start; 5665 5666 ret = bpf_sock_ops_get_syn(bpf_sock, optname, &start); 5667 if (ret > 0) { 5668 copy_len = ret; 5669 if (optlen < copy_len) { 5670 copy_len = optlen; 5671 ret = -ENOSPC; 5672 } 5673 5674 memcpy(optval, start, copy_len); 5675 } 5676 5677 /* Zero out unused buffer at the end */ 5678 memset(optval + copy_len, 0, optlen - copy_len); 5679 5680 return ret; 5681 } 5682 5683 return _bpf_getsockopt(bpf_sock->sk, level, optname, optval, optlen); 5684 } 5685 5686 static const struct bpf_func_proto bpf_sock_ops_getsockopt_proto = { 5687 .func = bpf_sock_ops_getsockopt, 5688 .gpl_only = false, 5689 .ret_type = RET_INTEGER, 5690 .arg1_type = ARG_PTR_TO_CTX, 5691 .arg2_type = ARG_ANYTHING, 5692 .arg3_type = ARG_ANYTHING, 5693 .arg4_type = ARG_PTR_TO_UNINIT_MEM, 5694 .arg5_type = ARG_CONST_SIZE, 5695 }; 5696 5697 BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock, 5698 int, argval) 5699 { 5700 struct sock *sk = bpf_sock->sk; 5701 int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS; 5702 5703 if (!IS_ENABLED(CONFIG_INET) || !sk_fullsock(sk)) 5704 return -EINVAL; 5705 5706 tcp_sk(sk)->bpf_sock_ops_cb_flags = val; 5707 5708 return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS); 5709 } 5710 5711 static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = { 5712 .func = bpf_sock_ops_cb_flags_set, 5713 .gpl_only = false, 5714 .ret_type = RET_INTEGER, 5715 .arg1_type = ARG_PTR_TO_CTX, 5716 .arg2_type = ARG_ANYTHING, 5717 }; 5718 5719 const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly; 5720 EXPORT_SYMBOL_GPL(ipv6_bpf_stub); 5721 5722 BPF_CALL_3(bpf_bind, struct bpf_sock_addr_kern *, ctx, struct sockaddr *, addr, 5723 int, addr_len) 5724 { 5725 #ifdef CONFIG_INET 5726 struct sock *sk = ctx->sk; 5727 u32 flags = BIND_FROM_BPF; 5728 int err; 5729 5730 err = -EINVAL; 5731 if (addr_len < offsetofend(struct sockaddr, sa_family)) 5732 return err; 5733 if (addr->sa_family == AF_INET) { 5734 if (addr_len < sizeof(struct sockaddr_in)) 5735 return err; 5736 if (((struct sockaddr_in *)addr)->sin_port == htons(0)) 5737 flags |= BIND_FORCE_ADDRESS_NO_PORT; 5738 return __inet_bind(sk, addr, addr_len, flags); 5739 #if IS_ENABLED(CONFIG_IPV6) 5740 } else if (addr->sa_family == AF_INET6) { 5741 if (addr_len < SIN6_LEN_RFC2133) 5742 return err; 5743 if (((struct sockaddr_in6 *)addr)->sin6_port == htons(0)) 5744 flags |= BIND_FORCE_ADDRESS_NO_PORT; 5745 /* ipv6_bpf_stub cannot be NULL, since it's called from 5746 * bpf_cgroup_inet6_connect hook and ipv6 is already loaded 5747 */ 5748 return ipv6_bpf_stub->inet6_bind(sk, addr, addr_len, flags); 5749 #endif /* CONFIG_IPV6 */ 5750 } 5751 #endif /* CONFIG_INET */ 5752 5753 return -EAFNOSUPPORT; 5754 } 5755 5756 static const struct bpf_func_proto bpf_bind_proto = { 5757 .func = bpf_bind, 5758 .gpl_only = false, 5759 .ret_type = RET_INTEGER, 5760 .arg1_type = ARG_PTR_TO_CTX, 5761 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 5762 .arg3_type = ARG_CONST_SIZE, 5763 }; 5764 5765 #ifdef CONFIG_XFRM 5766 5767 #if (IS_BUILTIN(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \ 5768 (IS_MODULE(CONFIG_XFRM_INTERFACE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES)) 5769 5770 struct metadata_dst __percpu *xfrm_bpf_md_dst; 5771 EXPORT_SYMBOL_GPL(xfrm_bpf_md_dst); 5772 5773 #endif 5774 5775 BPF_CALL_5(bpf_skb_get_xfrm_state, struct sk_buff *, skb, u32, index, 5776 struct bpf_xfrm_state *, to, u32, size, u64, flags) 5777 { 5778 const struct sec_path *sp = skb_sec_path(skb); 5779 const struct xfrm_state *x; 5780 5781 if (!sp || unlikely(index >= sp->len || flags)) 5782 goto err_clear; 5783 5784 x = sp->xvec[index]; 5785 5786 if (unlikely(size != sizeof(struct bpf_xfrm_state))) 5787 goto err_clear; 5788 5789 to->reqid = x->props.reqid; 5790 to->spi = x->id.spi; 5791 to->family = x->props.family; 5792 to->ext = 0; 5793 5794 if (to->family == AF_INET6) { 5795 memcpy(to->remote_ipv6, x->props.saddr.a6, 5796 sizeof(to->remote_ipv6)); 5797 } else { 5798 to->remote_ipv4 = x->props.saddr.a4; 5799 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); 5800 } 5801 5802 return 0; 5803 err_clear: 5804 memset(to, 0, size); 5805 return -EINVAL; 5806 } 5807 5808 static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto = { 5809 .func = bpf_skb_get_xfrm_state, 5810 .gpl_only = false, 5811 .ret_type = RET_INTEGER, 5812 .arg1_type = ARG_PTR_TO_CTX, 5813 .arg2_type = ARG_ANYTHING, 5814 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 5815 .arg4_type = ARG_CONST_SIZE, 5816 .arg5_type = ARG_ANYTHING, 5817 }; 5818 #endif 5819 5820 #if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6) 5821 static int bpf_fib_set_fwd_params(struct bpf_fib_lookup *params, u32 mtu) 5822 { 5823 params->h_vlan_TCI = 0; 5824 params->h_vlan_proto = 0; 5825 if (mtu) 5826 params->mtu_result = mtu; /* union with tot_len */ 5827 5828 return 0; 5829 } 5830 #endif 5831 5832 #if IS_ENABLED(CONFIG_INET) 5833 static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params, 5834 u32 flags, bool check_mtu) 5835 { 5836 struct fib_nh_common *nhc; 5837 struct in_device *in_dev; 5838 struct neighbour *neigh; 5839 struct net_device *dev; 5840 struct fib_result res; 5841 struct flowi4 fl4; 5842 u32 mtu = 0; 5843 int err; 5844 5845 dev = dev_get_by_index_rcu(net, params->ifindex); 5846 if (unlikely(!dev)) 5847 return -ENODEV; 5848 5849 /* verify forwarding is enabled on this interface */ 5850 in_dev = __in_dev_get_rcu(dev); 5851 if (unlikely(!in_dev || !IN_DEV_FORWARD(in_dev))) 5852 return BPF_FIB_LKUP_RET_FWD_DISABLED; 5853 5854 if (flags & BPF_FIB_LOOKUP_OUTPUT) { 5855 fl4.flowi4_iif = 1; 5856 fl4.flowi4_oif = params->ifindex; 5857 } else { 5858 fl4.flowi4_iif = params->ifindex; 5859 fl4.flowi4_oif = 0; 5860 } 5861 fl4.flowi4_tos = params->tos & IPTOS_RT_MASK; 5862 fl4.flowi4_scope = RT_SCOPE_UNIVERSE; 5863 fl4.flowi4_flags = 0; 5864 5865 fl4.flowi4_proto = params->l4_protocol; 5866 fl4.daddr = params->ipv4_dst; 5867 fl4.saddr = params->ipv4_src; 5868 fl4.fl4_sport = params->sport; 5869 fl4.fl4_dport = params->dport; 5870 fl4.flowi4_multipath_hash = 0; 5871 5872 if (flags & BPF_FIB_LOOKUP_DIRECT) { 5873 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; 5874 struct fib_table *tb; 5875 5876 if (flags & BPF_FIB_LOOKUP_TBID) { 5877 tbid = params->tbid; 5878 /* zero out for vlan output */ 5879 params->tbid = 0; 5880 } 5881 5882 tb = fib_get_table(net, tbid); 5883 if (unlikely(!tb)) 5884 return BPF_FIB_LKUP_RET_NOT_FWDED; 5885 5886 err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); 5887 } else { 5888 fl4.flowi4_mark = 0; 5889 fl4.flowi4_secid = 0; 5890 fl4.flowi4_tun_key.tun_id = 0; 5891 fl4.flowi4_uid = sock_net_uid(net, NULL); 5892 5893 err = fib_lookup(net, &fl4, &res, FIB_LOOKUP_NOREF); 5894 } 5895 5896 if (err) { 5897 /* map fib lookup errors to RTN_ type */ 5898 if (err == -EINVAL) 5899 return BPF_FIB_LKUP_RET_BLACKHOLE; 5900 if (err == -EHOSTUNREACH) 5901 return BPF_FIB_LKUP_RET_UNREACHABLE; 5902 if (err == -EACCES) 5903 return BPF_FIB_LKUP_RET_PROHIBIT; 5904 5905 return BPF_FIB_LKUP_RET_NOT_FWDED; 5906 } 5907 5908 if (res.type != RTN_UNICAST) 5909 return BPF_FIB_LKUP_RET_NOT_FWDED; 5910 5911 if (fib_info_num_path(res.fi) > 1) 5912 fib_select_path(net, &res, &fl4, NULL); 5913 5914 if (check_mtu) { 5915 mtu = ip_mtu_from_fib_result(&res, params->ipv4_dst); 5916 if (params->tot_len > mtu) { 5917 params->mtu_result = mtu; /* union with tot_len */ 5918 return BPF_FIB_LKUP_RET_FRAG_NEEDED; 5919 } 5920 } 5921 5922 nhc = res.nhc; 5923 5924 /* do not handle lwt encaps right now */ 5925 if (nhc->nhc_lwtstate) 5926 return BPF_FIB_LKUP_RET_UNSUPP_LWT; 5927 5928 dev = nhc->nhc_dev; 5929 5930 params->rt_metric = res.fi->fib_priority; 5931 params->ifindex = dev->ifindex; 5932 5933 if (flags & BPF_FIB_LOOKUP_SRC) 5934 params->ipv4_src = fib_result_prefsrc(net, &res); 5935 5936 /* xdp and cls_bpf programs are run in RCU-bh so 5937 * rcu_read_lock_bh is not needed here 5938 */ 5939 if (likely(nhc->nhc_gw_family != AF_INET6)) { 5940 if (nhc->nhc_gw_family) 5941 params->ipv4_dst = nhc->nhc_gw.ipv4; 5942 } else { 5943 struct in6_addr *dst = (struct in6_addr *)params->ipv6_dst; 5944 5945 params->family = AF_INET6; 5946 *dst = nhc->nhc_gw.ipv6; 5947 } 5948 5949 if (flags & BPF_FIB_LOOKUP_SKIP_NEIGH) 5950 goto set_fwd_params; 5951 5952 if (likely(nhc->nhc_gw_family != AF_INET6)) 5953 neigh = __ipv4_neigh_lookup_noref(dev, 5954 (__force u32)params->ipv4_dst); 5955 else 5956 neigh = __ipv6_neigh_lookup_noref_stub(dev, params->ipv6_dst); 5957 5958 if (!neigh || !(READ_ONCE(neigh->nud_state) & NUD_VALID)) 5959 return BPF_FIB_LKUP_RET_NO_NEIGH; 5960 memcpy(params->dmac, neigh->ha, ETH_ALEN); 5961 memcpy(params->smac, dev->dev_addr, ETH_ALEN); 5962 5963 set_fwd_params: 5964 return bpf_fib_set_fwd_params(params, mtu); 5965 } 5966 #endif 5967 5968 #if IS_ENABLED(CONFIG_IPV6) 5969 static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params, 5970 u32 flags, bool check_mtu) 5971 { 5972 struct in6_addr *src = (struct in6_addr *) params->ipv6_src; 5973 struct in6_addr *dst = (struct in6_addr *) params->ipv6_dst; 5974 struct fib6_result res = {}; 5975 struct neighbour *neigh; 5976 struct net_device *dev; 5977 struct inet6_dev *idev; 5978 struct flowi6 fl6; 5979 int strict = 0; 5980 int oif, err; 5981 u32 mtu = 0; 5982 5983 /* link local addresses are never forwarded */ 5984 if (rt6_need_strict(dst) || rt6_need_strict(src)) 5985 return BPF_FIB_LKUP_RET_NOT_FWDED; 5986 5987 dev = dev_get_by_index_rcu(net, params->ifindex); 5988 if (unlikely(!dev)) 5989 return -ENODEV; 5990 5991 idev = __in6_dev_get_safely(dev); 5992 if (unlikely(!idev || !idev->cnf.forwarding)) 5993 return BPF_FIB_LKUP_RET_FWD_DISABLED; 5994 5995 if (flags & BPF_FIB_LOOKUP_OUTPUT) { 5996 fl6.flowi6_iif = 1; 5997 oif = fl6.flowi6_oif = params->ifindex; 5998 } else { 5999 oif = fl6.flowi6_iif = params->ifindex; 6000 fl6.flowi6_oif = 0; 6001 strict = RT6_LOOKUP_F_HAS_SADDR; 6002 } 6003 fl6.flowlabel = params->flowinfo; 6004 fl6.flowi6_scope = 0; 6005 fl6.flowi6_flags = 0; 6006 fl6.mp_hash = 0; 6007 6008 fl6.flowi6_proto = params->l4_protocol; 6009 fl6.daddr = *dst; 6010 fl6.saddr = *src; 6011 fl6.fl6_sport = params->sport; 6012 fl6.fl6_dport = params->dport; 6013 6014 if (flags & BPF_FIB_LOOKUP_DIRECT) { 6015 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; 6016 struct fib6_table *tb; 6017 6018 if (flags & BPF_FIB_LOOKUP_TBID) { 6019 tbid = params->tbid; 6020 /* zero out for vlan output */ 6021 params->tbid = 0; 6022 } 6023 6024 tb = ipv6_stub->fib6_get_table(net, tbid); 6025 if (unlikely(!tb)) 6026 return BPF_FIB_LKUP_RET_NOT_FWDED; 6027 6028 err = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6, &res, 6029 strict); 6030 } else { 6031 fl6.flowi6_mark = 0; 6032 fl6.flowi6_secid = 0; 6033 fl6.flowi6_tun_key.tun_id = 0; 6034 fl6.flowi6_uid = sock_net_uid(net, NULL); 6035 6036 err = ipv6_stub->fib6_lookup(net, oif, &fl6, &res, strict); 6037 } 6038 6039 if (unlikely(err || IS_ERR_OR_NULL(res.f6i) || 6040 res.f6i == net->ipv6.fib6_null_entry)) 6041 return BPF_FIB_LKUP_RET_NOT_FWDED; 6042 6043 switch (res.fib6_type) { 6044 /* only unicast is forwarded */ 6045 case RTN_UNICAST: 6046 break; 6047 case RTN_BLACKHOLE: 6048 return BPF_FIB_LKUP_RET_BLACKHOLE; 6049 case RTN_UNREACHABLE: 6050 return BPF_FIB_LKUP_RET_UNREACHABLE; 6051 case RTN_PROHIBIT: 6052 return BPF_FIB_LKUP_RET_PROHIBIT; 6053 default: 6054 return BPF_FIB_LKUP_RET_NOT_FWDED; 6055 } 6056 6057 ipv6_stub->fib6_select_path(net, &res, &fl6, fl6.flowi6_oif, 6058 fl6.flowi6_oif != 0, NULL, strict); 6059 6060 if (check_mtu) { 6061 mtu = ipv6_stub->ip6_mtu_from_fib6(&res, dst, src); 6062 if (params->tot_len > mtu) { 6063 params->mtu_result = mtu; /* union with tot_len */ 6064 return BPF_FIB_LKUP_RET_FRAG_NEEDED; 6065 } 6066 } 6067 6068 if (res.nh->fib_nh_lws) 6069 return BPF_FIB_LKUP_RET_UNSUPP_LWT; 6070 6071 if (res.nh->fib_nh_gw_family) 6072 *dst = res.nh->fib_nh_gw6; 6073 6074 dev = res.nh->fib_nh_dev; 6075 params->rt_metric = res.f6i->fib6_metric; 6076 params->ifindex = dev->ifindex; 6077 6078 if (flags & BPF_FIB_LOOKUP_SRC) { 6079 if (res.f6i->fib6_prefsrc.plen) { 6080 *src = res.f6i->fib6_prefsrc.addr; 6081 } else { 6082 err = ipv6_bpf_stub->ipv6_dev_get_saddr(net, dev, 6083 &fl6.daddr, 0, 6084 src); 6085 if (err) 6086 return BPF_FIB_LKUP_RET_NO_SRC_ADDR; 6087 } 6088 } 6089 6090 if (flags & BPF_FIB_LOOKUP_SKIP_NEIGH) 6091 goto set_fwd_params; 6092 6093 /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is 6094 * not needed here. 6095 */ 6096 neigh = __ipv6_neigh_lookup_noref_stub(dev, dst); 6097 if (!neigh || !(READ_ONCE(neigh->nud_state) & NUD_VALID)) 6098 return BPF_FIB_LKUP_RET_NO_NEIGH; 6099 memcpy(params->dmac, neigh->ha, ETH_ALEN); 6100 memcpy(params->smac, dev->dev_addr, ETH_ALEN); 6101 6102 set_fwd_params: 6103 return bpf_fib_set_fwd_params(params, mtu); 6104 } 6105 #endif 6106 6107 #define BPF_FIB_LOOKUP_MASK (BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT | \ 6108 BPF_FIB_LOOKUP_SKIP_NEIGH | BPF_FIB_LOOKUP_TBID | \ 6109 BPF_FIB_LOOKUP_SRC) 6110 6111 BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx, 6112 struct bpf_fib_lookup *, params, int, plen, u32, flags) 6113 { 6114 if (plen < sizeof(*params)) 6115 return -EINVAL; 6116 6117 if (flags & ~BPF_FIB_LOOKUP_MASK) 6118 return -EINVAL; 6119 6120 switch (params->family) { 6121 #if IS_ENABLED(CONFIG_INET) 6122 case AF_INET: 6123 return bpf_ipv4_fib_lookup(dev_net(ctx->rxq->dev), params, 6124 flags, true); 6125 #endif 6126 #if IS_ENABLED(CONFIG_IPV6) 6127 case AF_INET6: 6128 return bpf_ipv6_fib_lookup(dev_net(ctx->rxq->dev), params, 6129 flags, true); 6130 #endif 6131 } 6132 return -EAFNOSUPPORT; 6133 } 6134 6135 static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = { 6136 .func = bpf_xdp_fib_lookup, 6137 .gpl_only = true, 6138 .ret_type = RET_INTEGER, 6139 .arg1_type = ARG_PTR_TO_CTX, 6140 .arg2_type = ARG_PTR_TO_MEM, 6141 .arg3_type = ARG_CONST_SIZE, 6142 .arg4_type = ARG_ANYTHING, 6143 }; 6144 6145 BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb, 6146 struct bpf_fib_lookup *, params, int, plen, u32, flags) 6147 { 6148 struct net *net = dev_net(skb->dev); 6149 int rc = -EAFNOSUPPORT; 6150 bool check_mtu = false; 6151 6152 if (plen < sizeof(*params)) 6153 return -EINVAL; 6154 6155 if (flags & ~BPF_FIB_LOOKUP_MASK) 6156 return -EINVAL; 6157 6158 if (params->tot_len) 6159 check_mtu = true; 6160 6161 switch (params->family) { 6162 #if IS_ENABLED(CONFIG_INET) 6163 case AF_INET: 6164 rc = bpf_ipv4_fib_lookup(net, params, flags, check_mtu); 6165 break; 6166 #endif 6167 #if IS_ENABLED(CONFIG_IPV6) 6168 case AF_INET6: 6169 rc = bpf_ipv6_fib_lookup(net, params, flags, check_mtu); 6170 break; 6171 #endif 6172 } 6173 6174 if (rc == BPF_FIB_LKUP_RET_SUCCESS && !check_mtu) { 6175 struct net_device *dev; 6176 6177 /* When tot_len isn't provided by user, check skb 6178 * against MTU of FIB lookup resulting net_device 6179 */ 6180 dev = dev_get_by_index_rcu(net, params->ifindex); 6181 if (!is_skb_forwardable(dev, skb)) 6182 rc = BPF_FIB_LKUP_RET_FRAG_NEEDED; 6183 6184 params->mtu_result = dev->mtu; /* union with tot_len */ 6185 } 6186 6187 return rc; 6188 } 6189 6190 static const struct bpf_func_proto bpf_skb_fib_lookup_proto = { 6191 .func = bpf_skb_fib_lookup, 6192 .gpl_only = true, 6193 .ret_type = RET_INTEGER, 6194 .arg1_type = ARG_PTR_TO_CTX, 6195 .arg2_type = ARG_PTR_TO_MEM, 6196 .arg3_type = ARG_CONST_SIZE, 6197 .arg4_type = ARG_ANYTHING, 6198 }; 6199 6200 static struct net_device *__dev_via_ifindex(struct net_device *dev_curr, 6201 u32 ifindex) 6202 { 6203 struct net *netns = dev_net(dev_curr); 6204 6205 /* Non-redirect use-cases can use ifindex=0 and save ifindex lookup */ 6206 if (ifindex == 0) 6207 return dev_curr; 6208 6209 return dev_get_by_index_rcu(netns, ifindex); 6210 } 6211 6212 BPF_CALL_5(bpf_skb_check_mtu, struct sk_buff *, skb, 6213 u32, ifindex, u32 *, mtu_len, s32, len_diff, u64, flags) 6214 { 6215 int ret = BPF_MTU_CHK_RET_FRAG_NEEDED; 6216 struct net_device *dev = skb->dev; 6217 int skb_len, dev_len; 6218 int mtu; 6219 6220 if (unlikely(flags & ~(BPF_MTU_CHK_SEGS))) 6221 return -EINVAL; 6222 6223 if (unlikely(flags & BPF_MTU_CHK_SEGS && (len_diff || *mtu_len))) 6224 return -EINVAL; 6225 6226 dev = __dev_via_ifindex(dev, ifindex); 6227 if (unlikely(!dev)) 6228 return -ENODEV; 6229 6230 mtu = READ_ONCE(dev->mtu); 6231 6232 dev_len = mtu + dev->hard_header_len; 6233 6234 /* If set use *mtu_len as input, L3 as iph->tot_len (like fib_lookup) */ 6235 skb_len = *mtu_len ? *mtu_len + dev->hard_header_len : skb->len; 6236 6237 skb_len += len_diff; /* minus result pass check */ 6238 if (skb_len <= dev_len) { 6239 ret = BPF_MTU_CHK_RET_SUCCESS; 6240 goto out; 6241 } 6242 /* At this point, skb->len exceed MTU, but as it include length of all 6243 * segments, it can still be below MTU. The SKB can possibly get 6244 * re-segmented in transmit path (see validate_xmit_skb). Thus, user 6245 * must choose if segs are to be MTU checked. 6246 */ 6247 if (skb_is_gso(skb)) { 6248 ret = BPF_MTU_CHK_RET_SUCCESS; 6249 6250 if (flags & BPF_MTU_CHK_SEGS && 6251 !skb_gso_validate_network_len(skb, mtu)) 6252 ret = BPF_MTU_CHK_RET_SEGS_TOOBIG; 6253 } 6254 out: 6255 /* BPF verifier guarantees valid pointer */ 6256 *mtu_len = mtu; 6257 6258 return ret; 6259 } 6260 6261 BPF_CALL_5(bpf_xdp_check_mtu, struct xdp_buff *, xdp, 6262 u32, ifindex, u32 *, mtu_len, s32, len_diff, u64, flags) 6263 { 6264 struct net_device *dev = xdp->rxq->dev; 6265 int xdp_len = xdp->data_end - xdp->data; 6266 int ret = BPF_MTU_CHK_RET_SUCCESS; 6267 int mtu, dev_len; 6268 6269 /* XDP variant doesn't support multi-buffer segment check (yet) */ 6270 if (unlikely(flags)) 6271 return -EINVAL; 6272 6273 dev = __dev_via_ifindex(dev, ifindex); 6274 if (unlikely(!dev)) 6275 return -ENODEV; 6276 6277 mtu = READ_ONCE(dev->mtu); 6278 6279 /* Add L2-header as dev MTU is L3 size */ 6280 dev_len = mtu + dev->hard_header_len; 6281 6282 /* Use *mtu_len as input, L3 as iph->tot_len (like fib_lookup) */ 6283 if (*mtu_len) 6284 xdp_len = *mtu_len + dev->hard_header_len; 6285 6286 xdp_len += len_diff; /* minus result pass check */ 6287 if (xdp_len > dev_len) 6288 ret = BPF_MTU_CHK_RET_FRAG_NEEDED; 6289 6290 /* BPF verifier guarantees valid pointer */ 6291 *mtu_len = mtu; 6292 6293 return ret; 6294 } 6295 6296 static const struct bpf_func_proto bpf_skb_check_mtu_proto = { 6297 .func = bpf_skb_check_mtu, 6298 .gpl_only = true, 6299 .ret_type = RET_INTEGER, 6300 .arg1_type = ARG_PTR_TO_CTX, 6301 .arg2_type = ARG_ANYTHING, 6302 .arg3_type = ARG_PTR_TO_INT, 6303 .arg4_type = ARG_ANYTHING, 6304 .arg5_type = ARG_ANYTHING, 6305 }; 6306 6307 static const struct bpf_func_proto bpf_xdp_check_mtu_proto = { 6308 .func = bpf_xdp_check_mtu, 6309 .gpl_only = true, 6310 .ret_type = RET_INTEGER, 6311 .arg1_type = ARG_PTR_TO_CTX, 6312 .arg2_type = ARG_ANYTHING, 6313 .arg3_type = ARG_PTR_TO_INT, 6314 .arg4_type = ARG_ANYTHING, 6315 .arg5_type = ARG_ANYTHING, 6316 }; 6317 6318 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 6319 static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len) 6320 { 6321 int err; 6322 struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)hdr; 6323 6324 if (!seg6_validate_srh(srh, len, false)) 6325 return -EINVAL; 6326 6327 switch (type) { 6328 case BPF_LWT_ENCAP_SEG6_INLINE: 6329 if (skb->protocol != htons(ETH_P_IPV6)) 6330 return -EBADMSG; 6331 6332 err = seg6_do_srh_inline(skb, srh); 6333 break; 6334 case BPF_LWT_ENCAP_SEG6: 6335 skb_reset_inner_headers(skb); 6336 skb->encapsulation = 1; 6337 err = seg6_do_srh_encap(skb, srh, IPPROTO_IPV6); 6338 break; 6339 default: 6340 return -EINVAL; 6341 } 6342 6343 bpf_compute_data_pointers(skb); 6344 if (err) 6345 return err; 6346 6347 skb_set_transport_header(skb, sizeof(struct ipv6hdr)); 6348 6349 return seg6_lookup_nexthop(skb, NULL, 0); 6350 } 6351 #endif /* CONFIG_IPV6_SEG6_BPF */ 6352 6353 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 6354 static int bpf_push_ip_encap(struct sk_buff *skb, void *hdr, u32 len, 6355 bool ingress) 6356 { 6357 return bpf_lwt_push_ip_encap(skb, hdr, len, ingress); 6358 } 6359 #endif 6360 6361 BPF_CALL_4(bpf_lwt_in_push_encap, struct sk_buff *, skb, u32, type, void *, hdr, 6362 u32, len) 6363 { 6364 switch (type) { 6365 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 6366 case BPF_LWT_ENCAP_SEG6: 6367 case BPF_LWT_ENCAP_SEG6_INLINE: 6368 return bpf_push_seg6_encap(skb, type, hdr, len); 6369 #endif 6370 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 6371 case BPF_LWT_ENCAP_IP: 6372 return bpf_push_ip_encap(skb, hdr, len, true /* ingress */); 6373 #endif 6374 default: 6375 return -EINVAL; 6376 } 6377 } 6378 6379 BPF_CALL_4(bpf_lwt_xmit_push_encap, struct sk_buff *, skb, u32, type, 6380 void *, hdr, u32, len) 6381 { 6382 switch (type) { 6383 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) 6384 case BPF_LWT_ENCAP_IP: 6385 return bpf_push_ip_encap(skb, hdr, len, false /* egress */); 6386 #endif 6387 default: 6388 return -EINVAL; 6389 } 6390 } 6391 6392 static const struct bpf_func_proto bpf_lwt_in_push_encap_proto = { 6393 .func = bpf_lwt_in_push_encap, 6394 .gpl_only = false, 6395 .ret_type = RET_INTEGER, 6396 .arg1_type = ARG_PTR_TO_CTX, 6397 .arg2_type = ARG_ANYTHING, 6398 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6399 .arg4_type = ARG_CONST_SIZE 6400 }; 6401 6402 static const struct bpf_func_proto bpf_lwt_xmit_push_encap_proto = { 6403 .func = bpf_lwt_xmit_push_encap, 6404 .gpl_only = false, 6405 .ret_type = RET_INTEGER, 6406 .arg1_type = ARG_PTR_TO_CTX, 6407 .arg2_type = ARG_ANYTHING, 6408 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6409 .arg4_type = ARG_CONST_SIZE 6410 }; 6411 6412 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 6413 BPF_CALL_4(bpf_lwt_seg6_store_bytes, struct sk_buff *, skb, u32, offset, 6414 const void *, from, u32, len) 6415 { 6416 struct seg6_bpf_srh_state *srh_state = 6417 this_cpu_ptr(&seg6_bpf_srh_states); 6418 struct ipv6_sr_hdr *srh = srh_state->srh; 6419 void *srh_tlvs, *srh_end, *ptr; 6420 int srhoff = 0; 6421 6422 if (srh == NULL) 6423 return -EINVAL; 6424 6425 srh_tlvs = (void *)((char *)srh + ((srh->first_segment + 1) << 4)); 6426 srh_end = (void *)((char *)srh + sizeof(*srh) + srh_state->hdrlen); 6427 6428 ptr = skb->data + offset; 6429 if (ptr >= srh_tlvs && ptr + len <= srh_end) 6430 srh_state->valid = false; 6431 else if (ptr < (void *)&srh->flags || 6432 ptr + len > (void *)&srh->segments) 6433 return -EFAULT; 6434 6435 if (unlikely(bpf_try_make_writable(skb, offset + len))) 6436 return -EFAULT; 6437 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) 6438 return -EINVAL; 6439 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 6440 6441 memcpy(skb->data + offset, from, len); 6442 return 0; 6443 } 6444 6445 static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto = { 6446 .func = bpf_lwt_seg6_store_bytes, 6447 .gpl_only = false, 6448 .ret_type = RET_INTEGER, 6449 .arg1_type = ARG_PTR_TO_CTX, 6450 .arg2_type = ARG_ANYTHING, 6451 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6452 .arg4_type = ARG_CONST_SIZE 6453 }; 6454 6455 static void bpf_update_srh_state(struct sk_buff *skb) 6456 { 6457 struct seg6_bpf_srh_state *srh_state = 6458 this_cpu_ptr(&seg6_bpf_srh_states); 6459 int srhoff = 0; 6460 6461 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) { 6462 srh_state->srh = NULL; 6463 } else { 6464 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 6465 srh_state->hdrlen = srh_state->srh->hdrlen << 3; 6466 srh_state->valid = true; 6467 } 6468 } 6469 6470 BPF_CALL_4(bpf_lwt_seg6_action, struct sk_buff *, skb, 6471 u32, action, void *, param, u32, param_len) 6472 { 6473 struct seg6_bpf_srh_state *srh_state = 6474 this_cpu_ptr(&seg6_bpf_srh_states); 6475 int hdroff = 0; 6476 int err; 6477 6478 switch (action) { 6479 case SEG6_LOCAL_ACTION_END_X: 6480 if (!seg6_bpf_has_valid_srh(skb)) 6481 return -EBADMSG; 6482 if (param_len != sizeof(struct in6_addr)) 6483 return -EINVAL; 6484 return seg6_lookup_nexthop(skb, (struct in6_addr *)param, 0); 6485 case SEG6_LOCAL_ACTION_END_T: 6486 if (!seg6_bpf_has_valid_srh(skb)) 6487 return -EBADMSG; 6488 if (param_len != sizeof(int)) 6489 return -EINVAL; 6490 return seg6_lookup_nexthop(skb, NULL, *(int *)param); 6491 case SEG6_LOCAL_ACTION_END_DT6: 6492 if (!seg6_bpf_has_valid_srh(skb)) 6493 return -EBADMSG; 6494 if (param_len != sizeof(int)) 6495 return -EINVAL; 6496 6497 if (ipv6_find_hdr(skb, &hdroff, IPPROTO_IPV6, NULL, NULL) < 0) 6498 return -EBADMSG; 6499 if (!pskb_pull(skb, hdroff)) 6500 return -EBADMSG; 6501 6502 skb_postpull_rcsum(skb, skb_network_header(skb), hdroff); 6503 skb_reset_network_header(skb); 6504 skb_reset_transport_header(skb); 6505 skb->encapsulation = 0; 6506 6507 bpf_compute_data_pointers(skb); 6508 bpf_update_srh_state(skb); 6509 return seg6_lookup_nexthop(skb, NULL, *(int *)param); 6510 case SEG6_LOCAL_ACTION_END_B6: 6511 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) 6512 return -EBADMSG; 6513 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6_INLINE, 6514 param, param_len); 6515 if (!err) 6516 bpf_update_srh_state(skb); 6517 6518 return err; 6519 case SEG6_LOCAL_ACTION_END_B6_ENCAP: 6520 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) 6521 return -EBADMSG; 6522 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6, 6523 param, param_len); 6524 if (!err) 6525 bpf_update_srh_state(skb); 6526 6527 return err; 6528 default: 6529 return -EINVAL; 6530 } 6531 } 6532 6533 static const struct bpf_func_proto bpf_lwt_seg6_action_proto = { 6534 .func = bpf_lwt_seg6_action, 6535 .gpl_only = false, 6536 .ret_type = RET_INTEGER, 6537 .arg1_type = ARG_PTR_TO_CTX, 6538 .arg2_type = ARG_ANYTHING, 6539 .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6540 .arg4_type = ARG_CONST_SIZE 6541 }; 6542 6543 BPF_CALL_3(bpf_lwt_seg6_adjust_srh, struct sk_buff *, skb, u32, offset, 6544 s32, len) 6545 { 6546 struct seg6_bpf_srh_state *srh_state = 6547 this_cpu_ptr(&seg6_bpf_srh_states); 6548 struct ipv6_sr_hdr *srh = srh_state->srh; 6549 void *srh_end, *srh_tlvs, *ptr; 6550 struct ipv6hdr *hdr; 6551 int srhoff = 0; 6552 int ret; 6553 6554 if (unlikely(srh == NULL)) 6555 return -EINVAL; 6556 6557 srh_tlvs = (void *)((unsigned char *)srh + sizeof(*srh) + 6558 ((srh->first_segment + 1) << 4)); 6559 srh_end = (void *)((unsigned char *)srh + sizeof(*srh) + 6560 srh_state->hdrlen); 6561 ptr = skb->data + offset; 6562 6563 if (unlikely(ptr < srh_tlvs || ptr > srh_end)) 6564 return -EFAULT; 6565 if (unlikely(len < 0 && (void *)((char *)ptr - len) > srh_end)) 6566 return -EFAULT; 6567 6568 if (len > 0) { 6569 ret = skb_cow_head(skb, len); 6570 if (unlikely(ret < 0)) 6571 return ret; 6572 6573 ret = bpf_skb_net_hdr_push(skb, offset, len); 6574 } else { 6575 ret = bpf_skb_net_hdr_pop(skb, offset, -1 * len); 6576 } 6577 6578 bpf_compute_data_pointers(skb); 6579 if (unlikely(ret < 0)) 6580 return ret; 6581 6582 hdr = (struct ipv6hdr *)skb->data; 6583 hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); 6584 6585 if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) 6586 return -EINVAL; 6587 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); 6588 srh_state->hdrlen += len; 6589 srh_state->valid = false; 6590 return 0; 6591 } 6592 6593 static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = { 6594 .func = bpf_lwt_seg6_adjust_srh, 6595 .gpl_only = false, 6596 .ret_type = RET_INTEGER, 6597 .arg1_type = ARG_PTR_TO_CTX, 6598 .arg2_type = ARG_ANYTHING, 6599 .arg3_type = ARG_ANYTHING, 6600 }; 6601 #endif /* CONFIG_IPV6_SEG6_BPF */ 6602 6603 #ifdef CONFIG_INET 6604 static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple, 6605 int dif, int sdif, u8 family, u8 proto) 6606 { 6607 struct inet_hashinfo *hinfo = net->ipv4.tcp_death_row.hashinfo; 6608 bool refcounted = false; 6609 struct sock *sk = NULL; 6610 6611 if (family == AF_INET) { 6612 __be32 src4 = tuple->ipv4.saddr; 6613 __be32 dst4 = tuple->ipv4.daddr; 6614 6615 if (proto == IPPROTO_TCP) 6616 sk = __inet_lookup(net, hinfo, NULL, 0, 6617 src4, tuple->ipv4.sport, 6618 dst4, tuple->ipv4.dport, 6619 dif, sdif, &refcounted); 6620 else 6621 sk = __udp4_lib_lookup(net, src4, tuple->ipv4.sport, 6622 dst4, tuple->ipv4.dport, 6623 dif, sdif, net->ipv4.udp_table, NULL); 6624 #if IS_ENABLED(CONFIG_IPV6) 6625 } else { 6626 struct in6_addr *src6 = (struct in6_addr *)&tuple->ipv6.saddr; 6627 struct in6_addr *dst6 = (struct in6_addr *)&tuple->ipv6.daddr; 6628 6629 if (proto == IPPROTO_TCP) 6630 sk = __inet6_lookup(net, hinfo, NULL, 0, 6631 src6, tuple->ipv6.sport, 6632 dst6, ntohs(tuple->ipv6.dport), 6633 dif, sdif, &refcounted); 6634 else if (likely(ipv6_bpf_stub)) 6635 sk = ipv6_bpf_stub->udp6_lib_lookup(net, 6636 src6, tuple->ipv6.sport, 6637 dst6, tuple->ipv6.dport, 6638 dif, sdif, 6639 net->ipv4.udp_table, NULL); 6640 #endif 6641 } 6642 6643 if (unlikely(sk && !refcounted && !sock_flag(sk, SOCK_RCU_FREE))) { 6644 WARN_ONCE(1, "Found non-RCU, unreferenced socket!"); 6645 sk = NULL; 6646 } 6647 return sk; 6648 } 6649 6650 /* bpf_skc_lookup performs the core lookup for different types of sockets, 6651 * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE. 6652 */ 6653 static struct sock * 6654 __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6655 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, 6656 u64 flags, int sdif) 6657 { 6658 struct sock *sk = NULL; 6659 struct net *net; 6660 u8 family; 6661 6662 if (len == sizeof(tuple->ipv4)) 6663 family = AF_INET; 6664 else if (len == sizeof(tuple->ipv6)) 6665 family = AF_INET6; 6666 else 6667 return NULL; 6668 6669 if (unlikely(flags || !((s32)netns_id < 0 || netns_id <= S32_MAX))) 6670 goto out; 6671 6672 if (sdif < 0) { 6673 if (family == AF_INET) 6674 sdif = inet_sdif(skb); 6675 else 6676 sdif = inet6_sdif(skb); 6677 } 6678 6679 if ((s32)netns_id < 0) { 6680 net = caller_net; 6681 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); 6682 } else { 6683 net = get_net_ns_by_id(caller_net, netns_id); 6684 if (unlikely(!net)) 6685 goto out; 6686 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); 6687 put_net(net); 6688 } 6689 6690 out: 6691 return sk; 6692 } 6693 6694 static struct sock * 6695 __bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6696 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, 6697 u64 flags, int sdif) 6698 { 6699 struct sock *sk = __bpf_skc_lookup(skb, tuple, len, caller_net, 6700 ifindex, proto, netns_id, flags, 6701 sdif); 6702 6703 if (sk) { 6704 struct sock *sk2 = sk_to_full_sk(sk); 6705 6706 /* sk_to_full_sk() may return (sk)->rsk_listener, so make sure the original sk 6707 * sock refcnt is decremented to prevent a request_sock leak. 6708 */ 6709 if (!sk_fullsock(sk2)) 6710 sk2 = NULL; 6711 if (sk2 != sk) { 6712 sock_gen_put(sk); 6713 /* Ensure there is no need to bump sk2 refcnt */ 6714 if (unlikely(sk2 && !sock_flag(sk2, SOCK_RCU_FREE))) { 6715 WARN_ONCE(1, "Found non-RCU, unreferenced socket!"); 6716 return NULL; 6717 } 6718 sk = sk2; 6719 } 6720 } 6721 6722 return sk; 6723 } 6724 6725 static struct sock * 6726 bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6727 u8 proto, u64 netns_id, u64 flags) 6728 { 6729 struct net *caller_net; 6730 int ifindex; 6731 6732 if (skb->dev) { 6733 caller_net = dev_net(skb->dev); 6734 ifindex = skb->dev->ifindex; 6735 } else { 6736 caller_net = sock_net(skb->sk); 6737 ifindex = 0; 6738 } 6739 6740 return __bpf_skc_lookup(skb, tuple, len, caller_net, ifindex, proto, 6741 netns_id, flags, -1); 6742 } 6743 6744 static struct sock * 6745 bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, 6746 u8 proto, u64 netns_id, u64 flags) 6747 { 6748 struct sock *sk = bpf_skc_lookup(skb, tuple, len, proto, netns_id, 6749 flags); 6750 6751 if (sk) { 6752 struct sock *sk2 = sk_to_full_sk(sk); 6753 6754 /* sk_to_full_sk() may return (sk)->rsk_listener, so make sure the original sk 6755 * sock refcnt is decremented to prevent a request_sock leak. 6756 */ 6757 if (!sk_fullsock(sk2)) 6758 sk2 = NULL; 6759 if (sk2 != sk) { 6760 sock_gen_put(sk); 6761 /* Ensure there is no need to bump sk2 refcnt */ 6762 if (unlikely(sk2 && !sock_flag(sk2, SOCK_RCU_FREE))) { 6763 WARN_ONCE(1, "Found non-RCU, unreferenced socket!"); 6764 return NULL; 6765 } 6766 sk = sk2; 6767 } 6768 } 6769 6770 return sk; 6771 } 6772 6773 BPF_CALL_5(bpf_skc_lookup_tcp, struct sk_buff *, skb, 6774 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6775 { 6776 return (unsigned long)bpf_skc_lookup(skb, tuple, len, IPPROTO_TCP, 6777 netns_id, flags); 6778 } 6779 6780 static const struct bpf_func_proto bpf_skc_lookup_tcp_proto = { 6781 .func = bpf_skc_lookup_tcp, 6782 .gpl_only = false, 6783 .pkt_access = true, 6784 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 6785 .arg1_type = ARG_PTR_TO_CTX, 6786 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6787 .arg3_type = ARG_CONST_SIZE, 6788 .arg4_type = ARG_ANYTHING, 6789 .arg5_type = ARG_ANYTHING, 6790 }; 6791 6792 BPF_CALL_5(bpf_sk_lookup_tcp, struct sk_buff *, skb, 6793 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6794 { 6795 return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP, 6796 netns_id, flags); 6797 } 6798 6799 static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = { 6800 .func = bpf_sk_lookup_tcp, 6801 .gpl_only = false, 6802 .pkt_access = true, 6803 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6804 .arg1_type = ARG_PTR_TO_CTX, 6805 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6806 .arg3_type = ARG_CONST_SIZE, 6807 .arg4_type = ARG_ANYTHING, 6808 .arg5_type = ARG_ANYTHING, 6809 }; 6810 6811 BPF_CALL_5(bpf_sk_lookup_udp, struct sk_buff *, skb, 6812 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6813 { 6814 return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP, 6815 netns_id, flags); 6816 } 6817 6818 static const struct bpf_func_proto bpf_sk_lookup_udp_proto = { 6819 .func = bpf_sk_lookup_udp, 6820 .gpl_only = false, 6821 .pkt_access = true, 6822 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6823 .arg1_type = ARG_PTR_TO_CTX, 6824 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6825 .arg3_type = ARG_CONST_SIZE, 6826 .arg4_type = ARG_ANYTHING, 6827 .arg5_type = ARG_ANYTHING, 6828 }; 6829 6830 BPF_CALL_5(bpf_tc_skc_lookup_tcp, struct sk_buff *, skb, 6831 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6832 { 6833 struct net_device *dev = skb->dev; 6834 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6835 struct net *caller_net = dev_net(dev); 6836 6837 return (unsigned long)__bpf_skc_lookup(skb, tuple, len, caller_net, 6838 ifindex, IPPROTO_TCP, netns_id, 6839 flags, sdif); 6840 } 6841 6842 static const struct bpf_func_proto bpf_tc_skc_lookup_tcp_proto = { 6843 .func = bpf_tc_skc_lookup_tcp, 6844 .gpl_only = false, 6845 .pkt_access = true, 6846 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 6847 .arg1_type = ARG_PTR_TO_CTX, 6848 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6849 .arg3_type = ARG_CONST_SIZE, 6850 .arg4_type = ARG_ANYTHING, 6851 .arg5_type = ARG_ANYTHING, 6852 }; 6853 6854 BPF_CALL_5(bpf_tc_sk_lookup_tcp, struct sk_buff *, skb, 6855 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6856 { 6857 struct net_device *dev = skb->dev; 6858 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6859 struct net *caller_net = dev_net(dev); 6860 6861 return (unsigned long)__bpf_sk_lookup(skb, tuple, len, caller_net, 6862 ifindex, IPPROTO_TCP, netns_id, 6863 flags, sdif); 6864 } 6865 6866 static const struct bpf_func_proto bpf_tc_sk_lookup_tcp_proto = { 6867 .func = bpf_tc_sk_lookup_tcp, 6868 .gpl_only = false, 6869 .pkt_access = true, 6870 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6871 .arg1_type = ARG_PTR_TO_CTX, 6872 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6873 .arg3_type = ARG_CONST_SIZE, 6874 .arg4_type = ARG_ANYTHING, 6875 .arg5_type = ARG_ANYTHING, 6876 }; 6877 6878 BPF_CALL_5(bpf_tc_sk_lookup_udp, struct sk_buff *, skb, 6879 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6880 { 6881 struct net_device *dev = skb->dev; 6882 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6883 struct net *caller_net = dev_net(dev); 6884 6885 return (unsigned long)__bpf_sk_lookup(skb, tuple, len, caller_net, 6886 ifindex, IPPROTO_UDP, netns_id, 6887 flags, sdif); 6888 } 6889 6890 static const struct bpf_func_proto bpf_tc_sk_lookup_udp_proto = { 6891 .func = bpf_tc_sk_lookup_udp, 6892 .gpl_only = false, 6893 .pkt_access = true, 6894 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6895 .arg1_type = ARG_PTR_TO_CTX, 6896 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6897 .arg3_type = ARG_CONST_SIZE, 6898 .arg4_type = ARG_ANYTHING, 6899 .arg5_type = ARG_ANYTHING, 6900 }; 6901 6902 BPF_CALL_1(bpf_sk_release, struct sock *, sk) 6903 { 6904 if (sk && sk_is_refcounted(sk)) 6905 sock_gen_put(sk); 6906 return 0; 6907 } 6908 6909 static const struct bpf_func_proto bpf_sk_release_proto = { 6910 .func = bpf_sk_release, 6911 .gpl_only = false, 6912 .ret_type = RET_INTEGER, 6913 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON | OBJ_RELEASE, 6914 }; 6915 6916 BPF_CALL_5(bpf_xdp_sk_lookup_udp, struct xdp_buff *, ctx, 6917 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 6918 { 6919 struct net_device *dev = ctx->rxq->dev; 6920 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6921 struct net *caller_net = dev_net(dev); 6922 6923 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, 6924 ifindex, IPPROTO_UDP, netns_id, 6925 flags, sdif); 6926 } 6927 6928 static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = { 6929 .func = bpf_xdp_sk_lookup_udp, 6930 .gpl_only = false, 6931 .pkt_access = true, 6932 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6933 .arg1_type = ARG_PTR_TO_CTX, 6934 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6935 .arg3_type = ARG_CONST_SIZE, 6936 .arg4_type = ARG_ANYTHING, 6937 .arg5_type = ARG_ANYTHING, 6938 }; 6939 6940 BPF_CALL_5(bpf_xdp_skc_lookup_tcp, struct xdp_buff *, ctx, 6941 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 6942 { 6943 struct net_device *dev = ctx->rxq->dev; 6944 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6945 struct net *caller_net = dev_net(dev); 6946 6947 return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, caller_net, 6948 ifindex, IPPROTO_TCP, netns_id, 6949 flags, sdif); 6950 } 6951 6952 static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto = { 6953 .func = bpf_xdp_skc_lookup_tcp, 6954 .gpl_only = false, 6955 .pkt_access = true, 6956 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 6957 .arg1_type = ARG_PTR_TO_CTX, 6958 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6959 .arg3_type = ARG_CONST_SIZE, 6960 .arg4_type = ARG_ANYTHING, 6961 .arg5_type = ARG_ANYTHING, 6962 }; 6963 6964 BPF_CALL_5(bpf_xdp_sk_lookup_tcp, struct xdp_buff *, ctx, 6965 struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) 6966 { 6967 struct net_device *dev = ctx->rxq->dev; 6968 int ifindex = dev->ifindex, sdif = dev_sdif(dev); 6969 struct net *caller_net = dev_net(dev); 6970 6971 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, 6972 ifindex, IPPROTO_TCP, netns_id, 6973 flags, sdif); 6974 } 6975 6976 static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = { 6977 .func = bpf_xdp_sk_lookup_tcp, 6978 .gpl_only = false, 6979 .pkt_access = true, 6980 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 6981 .arg1_type = ARG_PTR_TO_CTX, 6982 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 6983 .arg3_type = ARG_CONST_SIZE, 6984 .arg4_type = ARG_ANYTHING, 6985 .arg5_type = ARG_ANYTHING, 6986 }; 6987 6988 BPF_CALL_5(bpf_sock_addr_skc_lookup_tcp, struct bpf_sock_addr_kern *, ctx, 6989 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 6990 { 6991 return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, 6992 sock_net(ctx->sk), 0, 6993 IPPROTO_TCP, netns_id, flags, 6994 -1); 6995 } 6996 6997 static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto = { 6998 .func = bpf_sock_addr_skc_lookup_tcp, 6999 .gpl_only = false, 7000 .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, 7001 .arg1_type = ARG_PTR_TO_CTX, 7002 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7003 .arg3_type = ARG_CONST_SIZE, 7004 .arg4_type = ARG_ANYTHING, 7005 .arg5_type = ARG_ANYTHING, 7006 }; 7007 7008 BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp, struct bpf_sock_addr_kern *, ctx, 7009 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 7010 { 7011 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, 7012 sock_net(ctx->sk), 0, IPPROTO_TCP, 7013 netns_id, flags, -1); 7014 } 7015 7016 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = { 7017 .func = bpf_sock_addr_sk_lookup_tcp, 7018 .gpl_only = false, 7019 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 7020 .arg1_type = ARG_PTR_TO_CTX, 7021 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7022 .arg3_type = ARG_CONST_SIZE, 7023 .arg4_type = ARG_ANYTHING, 7024 .arg5_type = ARG_ANYTHING, 7025 }; 7026 7027 BPF_CALL_5(bpf_sock_addr_sk_lookup_udp, struct bpf_sock_addr_kern *, ctx, 7028 struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) 7029 { 7030 return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, 7031 sock_net(ctx->sk), 0, IPPROTO_UDP, 7032 netns_id, flags, -1); 7033 } 7034 7035 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = { 7036 .func = bpf_sock_addr_sk_lookup_udp, 7037 .gpl_only = false, 7038 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 7039 .arg1_type = ARG_PTR_TO_CTX, 7040 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7041 .arg3_type = ARG_CONST_SIZE, 7042 .arg4_type = ARG_ANYTHING, 7043 .arg5_type = ARG_ANYTHING, 7044 }; 7045 7046 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 7047 struct bpf_insn_access_aux *info) 7048 { 7049 if (off < 0 || off >= offsetofend(struct bpf_tcp_sock, 7050 icsk_retransmits)) 7051 return false; 7052 7053 if (off % size != 0) 7054 return false; 7055 7056 switch (off) { 7057 case offsetof(struct bpf_tcp_sock, bytes_received): 7058 case offsetof(struct bpf_tcp_sock, bytes_acked): 7059 return size == sizeof(__u64); 7060 default: 7061 return size == sizeof(__u32); 7062 } 7063 } 7064 7065 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, 7066 const struct bpf_insn *si, 7067 struct bpf_insn *insn_buf, 7068 struct bpf_prog *prog, u32 *target_size) 7069 { 7070 struct bpf_insn *insn = insn_buf; 7071 7072 #define BPF_TCP_SOCK_GET_COMMON(FIELD) \ 7073 do { \ 7074 BUILD_BUG_ON(sizeof_field(struct tcp_sock, FIELD) > \ 7075 sizeof_field(struct bpf_tcp_sock, FIELD)); \ 7076 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_sock, FIELD),\ 7077 si->dst_reg, si->src_reg, \ 7078 offsetof(struct tcp_sock, FIELD)); \ 7079 } while (0) 7080 7081 #define BPF_INET_SOCK_GET_COMMON(FIELD) \ 7082 do { \ 7083 BUILD_BUG_ON(sizeof_field(struct inet_connection_sock, \ 7084 FIELD) > \ 7085 sizeof_field(struct bpf_tcp_sock, FIELD)); \ 7086 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 7087 struct inet_connection_sock, \ 7088 FIELD), \ 7089 si->dst_reg, si->src_reg, \ 7090 offsetof( \ 7091 struct inet_connection_sock, \ 7092 FIELD)); \ 7093 } while (0) 7094 7095 BTF_TYPE_EMIT(struct bpf_tcp_sock); 7096 7097 switch (si->off) { 7098 case offsetof(struct bpf_tcp_sock, rtt_min): 7099 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) != 7100 sizeof(struct minmax)); 7101 BUILD_BUG_ON(sizeof(struct minmax) < 7102 sizeof(struct minmax_sample)); 7103 7104 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 7105 offsetof(struct tcp_sock, rtt_min) + 7106 offsetof(struct minmax_sample, v)); 7107 break; 7108 case offsetof(struct bpf_tcp_sock, snd_cwnd): 7109 BPF_TCP_SOCK_GET_COMMON(snd_cwnd); 7110 break; 7111 case offsetof(struct bpf_tcp_sock, srtt_us): 7112 BPF_TCP_SOCK_GET_COMMON(srtt_us); 7113 break; 7114 case offsetof(struct bpf_tcp_sock, snd_ssthresh): 7115 BPF_TCP_SOCK_GET_COMMON(snd_ssthresh); 7116 break; 7117 case offsetof(struct bpf_tcp_sock, rcv_nxt): 7118 BPF_TCP_SOCK_GET_COMMON(rcv_nxt); 7119 break; 7120 case offsetof(struct bpf_tcp_sock, snd_nxt): 7121 BPF_TCP_SOCK_GET_COMMON(snd_nxt); 7122 break; 7123 case offsetof(struct bpf_tcp_sock, snd_una): 7124 BPF_TCP_SOCK_GET_COMMON(snd_una); 7125 break; 7126 case offsetof(struct bpf_tcp_sock, mss_cache): 7127 BPF_TCP_SOCK_GET_COMMON(mss_cache); 7128 break; 7129 case offsetof(struct bpf_tcp_sock, ecn_flags): 7130 BPF_TCP_SOCK_GET_COMMON(ecn_flags); 7131 break; 7132 case offsetof(struct bpf_tcp_sock, rate_delivered): 7133 BPF_TCP_SOCK_GET_COMMON(rate_delivered); 7134 break; 7135 case offsetof(struct bpf_tcp_sock, rate_interval_us): 7136 BPF_TCP_SOCK_GET_COMMON(rate_interval_us); 7137 break; 7138 case offsetof(struct bpf_tcp_sock, packets_out): 7139 BPF_TCP_SOCK_GET_COMMON(packets_out); 7140 break; 7141 case offsetof(struct bpf_tcp_sock, retrans_out): 7142 BPF_TCP_SOCK_GET_COMMON(retrans_out); 7143 break; 7144 case offsetof(struct bpf_tcp_sock, total_retrans): 7145 BPF_TCP_SOCK_GET_COMMON(total_retrans); 7146 break; 7147 case offsetof(struct bpf_tcp_sock, segs_in): 7148 BPF_TCP_SOCK_GET_COMMON(segs_in); 7149 break; 7150 case offsetof(struct bpf_tcp_sock, data_segs_in): 7151 BPF_TCP_SOCK_GET_COMMON(data_segs_in); 7152 break; 7153 case offsetof(struct bpf_tcp_sock, segs_out): 7154 BPF_TCP_SOCK_GET_COMMON(segs_out); 7155 break; 7156 case offsetof(struct bpf_tcp_sock, data_segs_out): 7157 BPF_TCP_SOCK_GET_COMMON(data_segs_out); 7158 break; 7159 case offsetof(struct bpf_tcp_sock, lost_out): 7160 BPF_TCP_SOCK_GET_COMMON(lost_out); 7161 break; 7162 case offsetof(struct bpf_tcp_sock, sacked_out): 7163 BPF_TCP_SOCK_GET_COMMON(sacked_out); 7164 break; 7165 case offsetof(struct bpf_tcp_sock, bytes_received): 7166 BPF_TCP_SOCK_GET_COMMON(bytes_received); 7167 break; 7168 case offsetof(struct bpf_tcp_sock, bytes_acked): 7169 BPF_TCP_SOCK_GET_COMMON(bytes_acked); 7170 break; 7171 case offsetof(struct bpf_tcp_sock, dsack_dups): 7172 BPF_TCP_SOCK_GET_COMMON(dsack_dups); 7173 break; 7174 case offsetof(struct bpf_tcp_sock, delivered): 7175 BPF_TCP_SOCK_GET_COMMON(delivered); 7176 break; 7177 case offsetof(struct bpf_tcp_sock, delivered_ce): 7178 BPF_TCP_SOCK_GET_COMMON(delivered_ce); 7179 break; 7180 case offsetof(struct bpf_tcp_sock, icsk_retransmits): 7181 BPF_INET_SOCK_GET_COMMON(icsk_retransmits); 7182 break; 7183 } 7184 7185 return insn - insn_buf; 7186 } 7187 7188 BPF_CALL_1(bpf_tcp_sock, struct sock *, sk) 7189 { 7190 if (sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP) 7191 return (unsigned long)sk; 7192 7193 return (unsigned long)NULL; 7194 } 7195 7196 const struct bpf_func_proto bpf_tcp_sock_proto = { 7197 .func = bpf_tcp_sock, 7198 .gpl_only = false, 7199 .ret_type = RET_PTR_TO_TCP_SOCK_OR_NULL, 7200 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 7201 }; 7202 7203 BPF_CALL_1(bpf_get_listener_sock, struct sock *, sk) 7204 { 7205 sk = sk_to_full_sk(sk); 7206 7207 if (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_RCU_FREE)) 7208 return (unsigned long)sk; 7209 7210 return (unsigned long)NULL; 7211 } 7212 7213 static const struct bpf_func_proto bpf_get_listener_sock_proto = { 7214 .func = bpf_get_listener_sock, 7215 .gpl_only = false, 7216 .ret_type = RET_PTR_TO_SOCKET_OR_NULL, 7217 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 7218 }; 7219 7220 BPF_CALL_1(bpf_skb_ecn_set_ce, struct sk_buff *, skb) 7221 { 7222 unsigned int iphdr_len; 7223 7224 switch (skb_protocol(skb, true)) { 7225 case cpu_to_be16(ETH_P_IP): 7226 iphdr_len = sizeof(struct iphdr); 7227 break; 7228 case cpu_to_be16(ETH_P_IPV6): 7229 iphdr_len = sizeof(struct ipv6hdr); 7230 break; 7231 default: 7232 return 0; 7233 } 7234 7235 if (skb_headlen(skb) < iphdr_len) 7236 return 0; 7237 7238 if (skb_cloned(skb) && !skb_clone_writable(skb, iphdr_len)) 7239 return 0; 7240 7241 return INET_ECN_set_ce(skb); 7242 } 7243 7244 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type, 7245 struct bpf_insn_access_aux *info) 7246 { 7247 if (off < 0 || off >= offsetofend(struct bpf_xdp_sock, queue_id)) 7248 return false; 7249 7250 if (off % size != 0) 7251 return false; 7252 7253 switch (off) { 7254 default: 7255 return size == sizeof(__u32); 7256 } 7257 } 7258 7259 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, 7260 const struct bpf_insn *si, 7261 struct bpf_insn *insn_buf, 7262 struct bpf_prog *prog, u32 *target_size) 7263 { 7264 struct bpf_insn *insn = insn_buf; 7265 7266 #define BPF_XDP_SOCK_GET(FIELD) \ 7267 do { \ 7268 BUILD_BUG_ON(sizeof_field(struct xdp_sock, FIELD) > \ 7269 sizeof_field(struct bpf_xdp_sock, FIELD)); \ 7270 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_sock, FIELD),\ 7271 si->dst_reg, si->src_reg, \ 7272 offsetof(struct xdp_sock, FIELD)); \ 7273 } while (0) 7274 7275 switch (si->off) { 7276 case offsetof(struct bpf_xdp_sock, queue_id): 7277 BPF_XDP_SOCK_GET(queue_id); 7278 break; 7279 } 7280 7281 return insn - insn_buf; 7282 } 7283 7284 static const struct bpf_func_proto bpf_skb_ecn_set_ce_proto = { 7285 .func = bpf_skb_ecn_set_ce, 7286 .gpl_only = false, 7287 .ret_type = RET_INTEGER, 7288 .arg1_type = ARG_PTR_TO_CTX, 7289 }; 7290 7291 BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len, 7292 struct tcphdr *, th, u32, th_len) 7293 { 7294 #ifdef CONFIG_SYN_COOKIES 7295 u32 cookie; 7296 int ret; 7297 7298 if (unlikely(!sk || th_len < sizeof(*th))) 7299 return -EINVAL; 7300 7301 /* sk_listener() allows TCP_NEW_SYN_RECV, which makes no sense here. */ 7302 if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN) 7303 return -EINVAL; 7304 7305 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_syncookies)) 7306 return -EINVAL; 7307 7308 if (!th->ack || th->rst || th->syn) 7309 return -ENOENT; 7310 7311 if (unlikely(iph_len < sizeof(struct iphdr))) 7312 return -EINVAL; 7313 7314 if (tcp_synq_no_recent_overflow(sk)) 7315 return -ENOENT; 7316 7317 cookie = ntohl(th->ack_seq) - 1; 7318 7319 /* Both struct iphdr and struct ipv6hdr have the version field at the 7320 * same offset so we can cast to the shorter header (struct iphdr). 7321 */ 7322 switch (((struct iphdr *)iph)->version) { 7323 case 4: 7324 if (sk->sk_family == AF_INET6 && ipv6_only_sock(sk)) 7325 return -EINVAL; 7326 7327 ret = __cookie_v4_check((struct iphdr *)iph, th, cookie); 7328 break; 7329 7330 #if IS_BUILTIN(CONFIG_IPV6) 7331 case 6: 7332 if (unlikely(iph_len < sizeof(struct ipv6hdr))) 7333 return -EINVAL; 7334 7335 if (sk->sk_family != AF_INET6) 7336 return -EINVAL; 7337 7338 ret = __cookie_v6_check((struct ipv6hdr *)iph, th, cookie); 7339 break; 7340 #endif /* CONFIG_IPV6 */ 7341 7342 default: 7343 return -EPROTONOSUPPORT; 7344 } 7345 7346 if (ret > 0) 7347 return 0; 7348 7349 return -ENOENT; 7350 #else 7351 return -ENOTSUPP; 7352 #endif 7353 } 7354 7355 static const struct bpf_func_proto bpf_tcp_check_syncookie_proto = { 7356 .func = bpf_tcp_check_syncookie, 7357 .gpl_only = true, 7358 .pkt_access = true, 7359 .ret_type = RET_INTEGER, 7360 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 7361 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7362 .arg3_type = ARG_CONST_SIZE, 7363 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7364 .arg5_type = ARG_CONST_SIZE, 7365 }; 7366 7367 BPF_CALL_5(bpf_tcp_gen_syncookie, struct sock *, sk, void *, iph, u32, iph_len, 7368 struct tcphdr *, th, u32, th_len) 7369 { 7370 #ifdef CONFIG_SYN_COOKIES 7371 u32 cookie; 7372 u16 mss; 7373 7374 if (unlikely(!sk || th_len < sizeof(*th) || th_len != th->doff * 4)) 7375 return -EINVAL; 7376 7377 if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN) 7378 return -EINVAL; 7379 7380 if (!READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_syncookies)) 7381 return -ENOENT; 7382 7383 if (!th->syn || th->ack || th->fin || th->rst) 7384 return -EINVAL; 7385 7386 if (unlikely(iph_len < sizeof(struct iphdr))) 7387 return -EINVAL; 7388 7389 /* Both struct iphdr and struct ipv6hdr have the version field at the 7390 * same offset so we can cast to the shorter header (struct iphdr). 7391 */ 7392 switch (((struct iphdr *)iph)->version) { 7393 case 4: 7394 if (sk->sk_family == AF_INET6 && ipv6_only_sock(sk)) 7395 return -EINVAL; 7396 7397 mss = tcp_v4_get_syncookie(sk, iph, th, &cookie); 7398 break; 7399 7400 #if IS_BUILTIN(CONFIG_IPV6) 7401 case 6: 7402 if (unlikely(iph_len < sizeof(struct ipv6hdr))) 7403 return -EINVAL; 7404 7405 if (sk->sk_family != AF_INET6) 7406 return -EINVAL; 7407 7408 mss = tcp_v6_get_syncookie(sk, iph, th, &cookie); 7409 break; 7410 #endif /* CONFIG_IPV6 */ 7411 7412 default: 7413 return -EPROTONOSUPPORT; 7414 } 7415 if (mss == 0) 7416 return -ENOENT; 7417 7418 return cookie | ((u64)mss << 32); 7419 #else 7420 return -EOPNOTSUPP; 7421 #endif /* CONFIG_SYN_COOKIES */ 7422 } 7423 7424 static const struct bpf_func_proto bpf_tcp_gen_syncookie_proto = { 7425 .func = bpf_tcp_gen_syncookie, 7426 .gpl_only = true, /* __cookie_v*_init_sequence() is GPL */ 7427 .pkt_access = true, 7428 .ret_type = RET_INTEGER, 7429 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 7430 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7431 .arg3_type = ARG_CONST_SIZE, 7432 .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7433 .arg5_type = ARG_CONST_SIZE, 7434 }; 7435 7436 BPF_CALL_3(bpf_sk_assign, struct sk_buff *, skb, struct sock *, sk, u64, flags) 7437 { 7438 if (!sk || flags != 0) 7439 return -EINVAL; 7440 if (!skb_at_tc_ingress(skb)) 7441 return -EOPNOTSUPP; 7442 if (unlikely(dev_net(skb->dev) != sock_net(sk))) 7443 return -ENETUNREACH; 7444 if (sk_unhashed(sk)) 7445 return -EOPNOTSUPP; 7446 if (sk_is_refcounted(sk) && 7447 unlikely(!refcount_inc_not_zero(&sk->sk_refcnt))) 7448 return -ENOENT; 7449 7450 skb_orphan(skb); 7451 skb->sk = sk; 7452 skb->destructor = sock_pfree; 7453 7454 return 0; 7455 } 7456 7457 static const struct bpf_func_proto bpf_sk_assign_proto = { 7458 .func = bpf_sk_assign, 7459 .gpl_only = false, 7460 .ret_type = RET_INTEGER, 7461 .arg1_type = ARG_PTR_TO_CTX, 7462 .arg2_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 7463 .arg3_type = ARG_ANYTHING, 7464 }; 7465 7466 static const u8 *bpf_search_tcp_opt(const u8 *op, const u8 *opend, 7467 u8 search_kind, const u8 *magic, 7468 u8 magic_len, bool *eol) 7469 { 7470 u8 kind, kind_len; 7471 7472 *eol = false; 7473 7474 while (op < opend) { 7475 kind = op[0]; 7476 7477 if (kind == TCPOPT_EOL) { 7478 *eol = true; 7479 return ERR_PTR(-ENOMSG); 7480 } else if (kind == TCPOPT_NOP) { 7481 op++; 7482 continue; 7483 } 7484 7485 if (opend - op < 2 || opend - op < op[1] || op[1] < 2) 7486 /* Something is wrong in the received header. 7487 * Follow the TCP stack's tcp_parse_options() 7488 * and just bail here. 7489 */ 7490 return ERR_PTR(-EFAULT); 7491 7492 kind_len = op[1]; 7493 if (search_kind == kind) { 7494 if (!magic_len) 7495 return op; 7496 7497 if (magic_len > kind_len - 2) 7498 return ERR_PTR(-ENOMSG); 7499 7500 if (!memcmp(&op[2], magic, magic_len)) 7501 return op; 7502 } 7503 7504 op += kind_len; 7505 } 7506 7507 return ERR_PTR(-ENOMSG); 7508 } 7509 7510 BPF_CALL_4(bpf_sock_ops_load_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock, 7511 void *, search_res, u32, len, u64, flags) 7512 { 7513 bool eol, load_syn = flags & BPF_LOAD_HDR_OPT_TCP_SYN; 7514 const u8 *op, *opend, *magic, *search = search_res; 7515 u8 search_kind, search_len, copy_len, magic_len; 7516 int ret; 7517 7518 /* 2 byte is the minimal option len except TCPOPT_NOP and 7519 * TCPOPT_EOL which are useless for the bpf prog to learn 7520 * and this helper disallow loading them also. 7521 */ 7522 if (len < 2 || flags & ~BPF_LOAD_HDR_OPT_TCP_SYN) 7523 return -EINVAL; 7524 7525 search_kind = search[0]; 7526 search_len = search[1]; 7527 7528 if (search_len > len || search_kind == TCPOPT_NOP || 7529 search_kind == TCPOPT_EOL) 7530 return -EINVAL; 7531 7532 if (search_kind == TCPOPT_EXP || search_kind == 253) { 7533 /* 16 or 32 bit magic. +2 for kind and kind length */ 7534 if (search_len != 4 && search_len != 6) 7535 return -EINVAL; 7536 magic = &search[2]; 7537 magic_len = search_len - 2; 7538 } else { 7539 if (search_len) 7540 return -EINVAL; 7541 magic = NULL; 7542 magic_len = 0; 7543 } 7544 7545 if (load_syn) { 7546 ret = bpf_sock_ops_get_syn(bpf_sock, TCP_BPF_SYN, &op); 7547 if (ret < 0) 7548 return ret; 7549 7550 opend = op + ret; 7551 op += sizeof(struct tcphdr); 7552 } else { 7553 if (!bpf_sock->skb || 7554 bpf_sock->op == BPF_SOCK_OPS_HDR_OPT_LEN_CB) 7555 /* This bpf_sock->op cannot call this helper */ 7556 return -EPERM; 7557 7558 opend = bpf_sock->skb_data_end; 7559 op = bpf_sock->skb->data + sizeof(struct tcphdr); 7560 } 7561 7562 op = bpf_search_tcp_opt(op, opend, search_kind, magic, magic_len, 7563 &eol); 7564 if (IS_ERR(op)) 7565 return PTR_ERR(op); 7566 7567 copy_len = op[1]; 7568 ret = copy_len; 7569 if (copy_len > len) { 7570 ret = -ENOSPC; 7571 copy_len = len; 7572 } 7573 7574 memcpy(search_res, op, copy_len); 7575 return ret; 7576 } 7577 7578 static const struct bpf_func_proto bpf_sock_ops_load_hdr_opt_proto = { 7579 .func = bpf_sock_ops_load_hdr_opt, 7580 .gpl_only = false, 7581 .ret_type = RET_INTEGER, 7582 .arg1_type = ARG_PTR_TO_CTX, 7583 .arg2_type = ARG_PTR_TO_MEM, 7584 .arg3_type = ARG_CONST_SIZE, 7585 .arg4_type = ARG_ANYTHING, 7586 }; 7587 7588 BPF_CALL_4(bpf_sock_ops_store_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock, 7589 const void *, from, u32, len, u64, flags) 7590 { 7591 u8 new_kind, new_kind_len, magic_len = 0, *opend; 7592 const u8 *op, *new_op, *magic = NULL; 7593 struct sk_buff *skb; 7594 bool eol; 7595 7596 if (bpf_sock->op != BPF_SOCK_OPS_WRITE_HDR_OPT_CB) 7597 return -EPERM; 7598 7599 if (len < 2 || flags) 7600 return -EINVAL; 7601 7602 new_op = from; 7603 new_kind = new_op[0]; 7604 new_kind_len = new_op[1]; 7605 7606 if (new_kind_len > len || new_kind == TCPOPT_NOP || 7607 new_kind == TCPOPT_EOL) 7608 return -EINVAL; 7609 7610 if (new_kind_len > bpf_sock->remaining_opt_len) 7611 return -ENOSPC; 7612 7613 /* 253 is another experimental kind */ 7614 if (new_kind == TCPOPT_EXP || new_kind == 253) { 7615 if (new_kind_len < 4) 7616 return -EINVAL; 7617 /* Match for the 2 byte magic also. 7618 * RFC 6994: the magic could be 2 or 4 bytes. 7619 * Hence, matching by 2 byte only is on the 7620 * conservative side but it is the right 7621 * thing to do for the 'search-for-duplication' 7622 * purpose. 7623 */ 7624 magic = &new_op[2]; 7625 magic_len = 2; 7626 } 7627 7628 /* Check for duplication */ 7629 skb = bpf_sock->skb; 7630 op = skb->data + sizeof(struct tcphdr); 7631 opend = bpf_sock->skb_data_end; 7632 7633 op = bpf_search_tcp_opt(op, opend, new_kind, magic, magic_len, 7634 &eol); 7635 if (!IS_ERR(op)) 7636 return -EEXIST; 7637 7638 if (PTR_ERR(op) != -ENOMSG) 7639 return PTR_ERR(op); 7640 7641 if (eol) 7642 /* The option has been ended. Treat it as no more 7643 * header option can be written. 7644 */ 7645 return -ENOSPC; 7646 7647 /* No duplication found. Store the header option. */ 7648 memcpy(opend, from, new_kind_len); 7649 7650 bpf_sock->remaining_opt_len -= new_kind_len; 7651 bpf_sock->skb_data_end += new_kind_len; 7652 7653 return 0; 7654 } 7655 7656 static const struct bpf_func_proto bpf_sock_ops_store_hdr_opt_proto = { 7657 .func = bpf_sock_ops_store_hdr_opt, 7658 .gpl_only = false, 7659 .ret_type = RET_INTEGER, 7660 .arg1_type = ARG_PTR_TO_CTX, 7661 .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 7662 .arg3_type = ARG_CONST_SIZE, 7663 .arg4_type = ARG_ANYTHING, 7664 }; 7665 7666 BPF_CALL_3(bpf_sock_ops_reserve_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock, 7667 u32, len, u64, flags) 7668 { 7669 if (bpf_sock->op != BPF_SOCK_OPS_HDR_OPT_LEN_CB) 7670 return -EPERM; 7671 7672 if (flags || len < 2) 7673 return -EINVAL; 7674 7675 if (len > bpf_sock->remaining_opt_len) 7676 return -ENOSPC; 7677 7678 bpf_sock->remaining_opt_len -= len; 7679 7680 return 0; 7681 } 7682 7683 static const struct bpf_func_proto bpf_sock_ops_reserve_hdr_opt_proto = { 7684 .func = bpf_sock_ops_reserve_hdr_opt, 7685 .gpl_only = false, 7686 .ret_type = RET_INTEGER, 7687 .arg1_type = ARG_PTR_TO_CTX, 7688 .arg2_type = ARG_ANYTHING, 7689 .arg3_type = ARG_ANYTHING, 7690 }; 7691 7692 BPF_CALL_3(bpf_skb_set_tstamp, struct sk_buff *, skb, 7693 u64, tstamp, u32, tstamp_type) 7694 { 7695 /* skb_clear_delivery_time() is done for inet protocol */ 7696 if (skb->protocol != htons(ETH_P_IP) && 7697 skb->protocol != htons(ETH_P_IPV6)) 7698 return -EOPNOTSUPP; 7699 7700 switch (tstamp_type) { 7701 case BPF_SKB_TSTAMP_DELIVERY_MONO: 7702 if (!tstamp) 7703 return -EINVAL; 7704 skb->tstamp = tstamp; 7705 skb->mono_delivery_time = 1; 7706 break; 7707 case BPF_SKB_TSTAMP_UNSPEC: 7708 if (tstamp) 7709 return -EINVAL; 7710 skb->tstamp = 0; 7711 skb->mono_delivery_time = 0; 7712 break; 7713 default: 7714 return -EINVAL; 7715 } 7716 7717 return 0; 7718 } 7719 7720 static const struct bpf_func_proto bpf_skb_set_tstamp_proto = { 7721 .func = bpf_skb_set_tstamp, 7722 .gpl_only = false, 7723 .ret_type = RET_INTEGER, 7724 .arg1_type = ARG_PTR_TO_CTX, 7725 .arg2_type = ARG_ANYTHING, 7726 .arg3_type = ARG_ANYTHING, 7727 }; 7728 7729 #ifdef CONFIG_SYN_COOKIES 7730 BPF_CALL_3(bpf_tcp_raw_gen_syncookie_ipv4, struct iphdr *, iph, 7731 struct tcphdr *, th, u32, th_len) 7732 { 7733 u32 cookie; 7734 u16 mss; 7735 7736 if (unlikely(th_len < sizeof(*th) || th_len != th->doff * 4)) 7737 return -EINVAL; 7738 7739 mss = tcp_parse_mss_option(th, 0) ?: TCP_MSS_DEFAULT; 7740 cookie = __cookie_v4_init_sequence(iph, th, &mss); 7741 7742 return cookie | ((u64)mss << 32); 7743 } 7744 7745 static const struct bpf_func_proto bpf_tcp_raw_gen_syncookie_ipv4_proto = { 7746 .func = bpf_tcp_raw_gen_syncookie_ipv4, 7747 .gpl_only = true, /* __cookie_v4_init_sequence() is GPL */ 7748 .pkt_access = true, 7749 .ret_type = RET_INTEGER, 7750 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7751 .arg1_size = sizeof(struct iphdr), 7752 .arg2_type = ARG_PTR_TO_MEM, 7753 .arg3_type = ARG_CONST_SIZE_OR_ZERO, 7754 }; 7755 7756 BPF_CALL_3(bpf_tcp_raw_gen_syncookie_ipv6, struct ipv6hdr *, iph, 7757 struct tcphdr *, th, u32, th_len) 7758 { 7759 #if IS_BUILTIN(CONFIG_IPV6) 7760 const u16 mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - 7761 sizeof(struct ipv6hdr); 7762 u32 cookie; 7763 u16 mss; 7764 7765 if (unlikely(th_len < sizeof(*th) || th_len != th->doff * 4)) 7766 return -EINVAL; 7767 7768 mss = tcp_parse_mss_option(th, 0) ?: mss_clamp; 7769 cookie = __cookie_v6_init_sequence(iph, th, &mss); 7770 7771 return cookie | ((u64)mss << 32); 7772 #else 7773 return -EPROTONOSUPPORT; 7774 #endif 7775 } 7776 7777 static const struct bpf_func_proto bpf_tcp_raw_gen_syncookie_ipv6_proto = { 7778 .func = bpf_tcp_raw_gen_syncookie_ipv6, 7779 .gpl_only = true, /* __cookie_v6_init_sequence() is GPL */ 7780 .pkt_access = true, 7781 .ret_type = RET_INTEGER, 7782 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7783 .arg1_size = sizeof(struct ipv6hdr), 7784 .arg2_type = ARG_PTR_TO_MEM, 7785 .arg3_type = ARG_CONST_SIZE_OR_ZERO, 7786 }; 7787 7788 BPF_CALL_2(bpf_tcp_raw_check_syncookie_ipv4, struct iphdr *, iph, 7789 struct tcphdr *, th) 7790 { 7791 u32 cookie = ntohl(th->ack_seq) - 1; 7792 7793 if (__cookie_v4_check(iph, th, cookie) > 0) 7794 return 0; 7795 7796 return -EACCES; 7797 } 7798 7799 static const struct bpf_func_proto bpf_tcp_raw_check_syncookie_ipv4_proto = { 7800 .func = bpf_tcp_raw_check_syncookie_ipv4, 7801 .gpl_only = true, /* __cookie_v4_check is GPL */ 7802 .pkt_access = true, 7803 .ret_type = RET_INTEGER, 7804 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7805 .arg1_size = sizeof(struct iphdr), 7806 .arg2_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7807 .arg2_size = sizeof(struct tcphdr), 7808 }; 7809 7810 BPF_CALL_2(bpf_tcp_raw_check_syncookie_ipv6, struct ipv6hdr *, iph, 7811 struct tcphdr *, th) 7812 { 7813 #if IS_BUILTIN(CONFIG_IPV6) 7814 u32 cookie = ntohl(th->ack_seq) - 1; 7815 7816 if (__cookie_v6_check(iph, th, cookie) > 0) 7817 return 0; 7818 7819 return -EACCES; 7820 #else 7821 return -EPROTONOSUPPORT; 7822 #endif 7823 } 7824 7825 static const struct bpf_func_proto bpf_tcp_raw_check_syncookie_ipv6_proto = { 7826 .func = bpf_tcp_raw_check_syncookie_ipv6, 7827 .gpl_only = true, /* __cookie_v6_check is GPL */ 7828 .pkt_access = true, 7829 .ret_type = RET_INTEGER, 7830 .arg1_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7831 .arg1_size = sizeof(struct ipv6hdr), 7832 .arg2_type = ARG_PTR_TO_FIXED_SIZE_MEM, 7833 .arg2_size = sizeof(struct tcphdr), 7834 }; 7835 #endif /* CONFIG_SYN_COOKIES */ 7836 7837 #endif /* CONFIG_INET */ 7838 7839 bool bpf_helper_changes_pkt_data(void *func) 7840 { 7841 if (func == bpf_skb_vlan_push || 7842 func == bpf_skb_vlan_pop || 7843 func == bpf_skb_store_bytes || 7844 func == bpf_skb_change_proto || 7845 func == bpf_skb_change_head || 7846 func == sk_skb_change_head || 7847 func == bpf_skb_change_tail || 7848 func == sk_skb_change_tail || 7849 func == bpf_skb_adjust_room || 7850 func == sk_skb_adjust_room || 7851 func == bpf_skb_pull_data || 7852 func == sk_skb_pull_data || 7853 func == bpf_clone_redirect || 7854 func == bpf_l3_csum_replace || 7855 func == bpf_l4_csum_replace || 7856 func == bpf_xdp_adjust_head || 7857 func == bpf_xdp_adjust_meta || 7858 func == bpf_msg_pull_data || 7859 func == bpf_msg_push_data || 7860 func == bpf_msg_pop_data || 7861 func == bpf_xdp_adjust_tail || 7862 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 7863 func == bpf_lwt_seg6_store_bytes || 7864 func == bpf_lwt_seg6_adjust_srh || 7865 func == bpf_lwt_seg6_action || 7866 #endif 7867 #ifdef CONFIG_INET 7868 func == bpf_sock_ops_store_hdr_opt || 7869 #endif 7870 func == bpf_lwt_in_push_encap || 7871 func == bpf_lwt_xmit_push_encap) 7872 return true; 7873 7874 return false; 7875 } 7876 7877 const struct bpf_func_proto bpf_event_output_data_proto __weak; 7878 const struct bpf_func_proto bpf_sk_storage_get_cg_sock_proto __weak; 7879 7880 static const struct bpf_func_proto * 7881 sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7882 { 7883 const struct bpf_func_proto *func_proto; 7884 7885 func_proto = cgroup_common_func_proto(func_id, prog); 7886 if (func_proto) 7887 return func_proto; 7888 7889 func_proto = cgroup_current_func_proto(func_id, prog); 7890 if (func_proto) 7891 return func_proto; 7892 7893 switch (func_id) { 7894 case BPF_FUNC_get_socket_cookie: 7895 return &bpf_get_socket_cookie_sock_proto; 7896 case BPF_FUNC_get_netns_cookie: 7897 return &bpf_get_netns_cookie_sock_proto; 7898 case BPF_FUNC_perf_event_output: 7899 return &bpf_event_output_data_proto; 7900 case BPF_FUNC_sk_storage_get: 7901 return &bpf_sk_storage_get_cg_sock_proto; 7902 case BPF_FUNC_ktime_get_coarse_ns: 7903 return &bpf_ktime_get_coarse_ns_proto; 7904 default: 7905 return bpf_base_func_proto(func_id); 7906 } 7907 } 7908 7909 static const struct bpf_func_proto * 7910 sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7911 { 7912 const struct bpf_func_proto *func_proto; 7913 7914 func_proto = cgroup_common_func_proto(func_id, prog); 7915 if (func_proto) 7916 return func_proto; 7917 7918 func_proto = cgroup_current_func_proto(func_id, prog); 7919 if (func_proto) 7920 return func_proto; 7921 7922 switch (func_id) { 7923 case BPF_FUNC_bind: 7924 switch (prog->expected_attach_type) { 7925 case BPF_CGROUP_INET4_CONNECT: 7926 case BPF_CGROUP_INET6_CONNECT: 7927 return &bpf_bind_proto; 7928 default: 7929 return NULL; 7930 } 7931 case BPF_FUNC_get_socket_cookie: 7932 return &bpf_get_socket_cookie_sock_addr_proto; 7933 case BPF_FUNC_get_netns_cookie: 7934 return &bpf_get_netns_cookie_sock_addr_proto; 7935 case BPF_FUNC_perf_event_output: 7936 return &bpf_event_output_data_proto; 7937 #ifdef CONFIG_INET 7938 case BPF_FUNC_sk_lookup_tcp: 7939 return &bpf_sock_addr_sk_lookup_tcp_proto; 7940 case BPF_FUNC_sk_lookup_udp: 7941 return &bpf_sock_addr_sk_lookup_udp_proto; 7942 case BPF_FUNC_sk_release: 7943 return &bpf_sk_release_proto; 7944 case BPF_FUNC_skc_lookup_tcp: 7945 return &bpf_sock_addr_skc_lookup_tcp_proto; 7946 #endif /* CONFIG_INET */ 7947 case BPF_FUNC_sk_storage_get: 7948 return &bpf_sk_storage_get_proto; 7949 case BPF_FUNC_sk_storage_delete: 7950 return &bpf_sk_storage_delete_proto; 7951 case BPF_FUNC_setsockopt: 7952 switch (prog->expected_attach_type) { 7953 case BPF_CGROUP_INET4_BIND: 7954 case BPF_CGROUP_INET6_BIND: 7955 case BPF_CGROUP_INET4_CONNECT: 7956 case BPF_CGROUP_INET6_CONNECT: 7957 case BPF_CGROUP_UDP4_RECVMSG: 7958 case BPF_CGROUP_UDP6_RECVMSG: 7959 case BPF_CGROUP_UDP4_SENDMSG: 7960 case BPF_CGROUP_UDP6_SENDMSG: 7961 case BPF_CGROUP_INET4_GETPEERNAME: 7962 case BPF_CGROUP_INET6_GETPEERNAME: 7963 case BPF_CGROUP_INET4_GETSOCKNAME: 7964 case BPF_CGROUP_INET6_GETSOCKNAME: 7965 return &bpf_sock_addr_setsockopt_proto; 7966 default: 7967 return NULL; 7968 } 7969 case BPF_FUNC_getsockopt: 7970 switch (prog->expected_attach_type) { 7971 case BPF_CGROUP_INET4_BIND: 7972 case BPF_CGROUP_INET6_BIND: 7973 case BPF_CGROUP_INET4_CONNECT: 7974 case BPF_CGROUP_INET6_CONNECT: 7975 case BPF_CGROUP_UDP4_RECVMSG: 7976 case BPF_CGROUP_UDP6_RECVMSG: 7977 case BPF_CGROUP_UDP4_SENDMSG: 7978 case BPF_CGROUP_UDP6_SENDMSG: 7979 case BPF_CGROUP_INET4_GETPEERNAME: 7980 case BPF_CGROUP_INET6_GETPEERNAME: 7981 case BPF_CGROUP_INET4_GETSOCKNAME: 7982 case BPF_CGROUP_INET6_GETSOCKNAME: 7983 return &bpf_sock_addr_getsockopt_proto; 7984 default: 7985 return NULL; 7986 } 7987 default: 7988 return bpf_sk_base_func_proto(func_id); 7989 } 7990 } 7991 7992 static const struct bpf_func_proto * 7993 sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 7994 { 7995 switch (func_id) { 7996 case BPF_FUNC_skb_load_bytes: 7997 return &bpf_skb_load_bytes_proto; 7998 case BPF_FUNC_skb_load_bytes_relative: 7999 return &bpf_skb_load_bytes_relative_proto; 8000 case BPF_FUNC_get_socket_cookie: 8001 return &bpf_get_socket_cookie_proto; 8002 case BPF_FUNC_get_socket_uid: 8003 return &bpf_get_socket_uid_proto; 8004 case BPF_FUNC_perf_event_output: 8005 return &bpf_skb_event_output_proto; 8006 default: 8007 return bpf_sk_base_func_proto(func_id); 8008 } 8009 } 8010 8011 const struct bpf_func_proto bpf_sk_storage_get_proto __weak; 8012 const struct bpf_func_proto bpf_sk_storage_delete_proto __weak; 8013 8014 static const struct bpf_func_proto * 8015 cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8016 { 8017 const struct bpf_func_proto *func_proto; 8018 8019 func_proto = cgroup_common_func_proto(func_id, prog); 8020 if (func_proto) 8021 return func_proto; 8022 8023 switch (func_id) { 8024 case BPF_FUNC_sk_fullsock: 8025 return &bpf_sk_fullsock_proto; 8026 case BPF_FUNC_sk_storage_get: 8027 return &bpf_sk_storage_get_proto; 8028 case BPF_FUNC_sk_storage_delete: 8029 return &bpf_sk_storage_delete_proto; 8030 case BPF_FUNC_perf_event_output: 8031 return &bpf_skb_event_output_proto; 8032 #ifdef CONFIG_SOCK_CGROUP_DATA 8033 case BPF_FUNC_skb_cgroup_id: 8034 return &bpf_skb_cgroup_id_proto; 8035 case BPF_FUNC_skb_ancestor_cgroup_id: 8036 return &bpf_skb_ancestor_cgroup_id_proto; 8037 case BPF_FUNC_sk_cgroup_id: 8038 return &bpf_sk_cgroup_id_proto; 8039 case BPF_FUNC_sk_ancestor_cgroup_id: 8040 return &bpf_sk_ancestor_cgroup_id_proto; 8041 #endif 8042 #ifdef CONFIG_INET 8043 case BPF_FUNC_sk_lookup_tcp: 8044 return &bpf_sk_lookup_tcp_proto; 8045 case BPF_FUNC_sk_lookup_udp: 8046 return &bpf_sk_lookup_udp_proto; 8047 case BPF_FUNC_sk_release: 8048 return &bpf_sk_release_proto; 8049 case BPF_FUNC_skc_lookup_tcp: 8050 return &bpf_skc_lookup_tcp_proto; 8051 case BPF_FUNC_tcp_sock: 8052 return &bpf_tcp_sock_proto; 8053 case BPF_FUNC_get_listener_sock: 8054 return &bpf_get_listener_sock_proto; 8055 case BPF_FUNC_skb_ecn_set_ce: 8056 return &bpf_skb_ecn_set_ce_proto; 8057 #endif 8058 default: 8059 return sk_filter_func_proto(func_id, prog); 8060 } 8061 } 8062 8063 static const struct bpf_func_proto * 8064 tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8065 { 8066 switch (func_id) { 8067 case BPF_FUNC_skb_store_bytes: 8068 return &bpf_skb_store_bytes_proto; 8069 case BPF_FUNC_skb_load_bytes: 8070 return &bpf_skb_load_bytes_proto; 8071 case BPF_FUNC_skb_load_bytes_relative: 8072 return &bpf_skb_load_bytes_relative_proto; 8073 case BPF_FUNC_skb_pull_data: 8074 return &bpf_skb_pull_data_proto; 8075 case BPF_FUNC_csum_diff: 8076 return &bpf_csum_diff_proto; 8077 case BPF_FUNC_csum_update: 8078 return &bpf_csum_update_proto; 8079 case BPF_FUNC_csum_level: 8080 return &bpf_csum_level_proto; 8081 case BPF_FUNC_l3_csum_replace: 8082 return &bpf_l3_csum_replace_proto; 8083 case BPF_FUNC_l4_csum_replace: 8084 return &bpf_l4_csum_replace_proto; 8085 case BPF_FUNC_clone_redirect: 8086 return &bpf_clone_redirect_proto; 8087 case BPF_FUNC_get_cgroup_classid: 8088 return &bpf_get_cgroup_classid_proto; 8089 case BPF_FUNC_skb_vlan_push: 8090 return &bpf_skb_vlan_push_proto; 8091 case BPF_FUNC_skb_vlan_pop: 8092 return &bpf_skb_vlan_pop_proto; 8093 case BPF_FUNC_skb_change_proto: 8094 return &bpf_skb_change_proto_proto; 8095 case BPF_FUNC_skb_change_type: 8096 return &bpf_skb_change_type_proto; 8097 case BPF_FUNC_skb_adjust_room: 8098 return &bpf_skb_adjust_room_proto; 8099 case BPF_FUNC_skb_change_tail: 8100 return &bpf_skb_change_tail_proto; 8101 case BPF_FUNC_skb_change_head: 8102 return &bpf_skb_change_head_proto; 8103 case BPF_FUNC_skb_get_tunnel_key: 8104 return &bpf_skb_get_tunnel_key_proto; 8105 case BPF_FUNC_skb_set_tunnel_key: 8106 return bpf_get_skb_set_tunnel_proto(func_id); 8107 case BPF_FUNC_skb_get_tunnel_opt: 8108 return &bpf_skb_get_tunnel_opt_proto; 8109 case BPF_FUNC_skb_set_tunnel_opt: 8110 return bpf_get_skb_set_tunnel_proto(func_id); 8111 case BPF_FUNC_redirect: 8112 return &bpf_redirect_proto; 8113 case BPF_FUNC_redirect_neigh: 8114 return &bpf_redirect_neigh_proto; 8115 case BPF_FUNC_redirect_peer: 8116 return &bpf_redirect_peer_proto; 8117 case BPF_FUNC_get_route_realm: 8118 return &bpf_get_route_realm_proto; 8119 case BPF_FUNC_get_hash_recalc: 8120 return &bpf_get_hash_recalc_proto; 8121 case BPF_FUNC_set_hash_invalid: 8122 return &bpf_set_hash_invalid_proto; 8123 case BPF_FUNC_set_hash: 8124 return &bpf_set_hash_proto; 8125 case BPF_FUNC_perf_event_output: 8126 return &bpf_skb_event_output_proto; 8127 case BPF_FUNC_get_smp_processor_id: 8128 return &bpf_get_smp_processor_id_proto; 8129 case BPF_FUNC_skb_under_cgroup: 8130 return &bpf_skb_under_cgroup_proto; 8131 case BPF_FUNC_get_socket_cookie: 8132 return &bpf_get_socket_cookie_proto; 8133 case BPF_FUNC_get_socket_uid: 8134 return &bpf_get_socket_uid_proto; 8135 case BPF_FUNC_fib_lookup: 8136 return &bpf_skb_fib_lookup_proto; 8137 case BPF_FUNC_check_mtu: 8138 return &bpf_skb_check_mtu_proto; 8139 case BPF_FUNC_sk_fullsock: 8140 return &bpf_sk_fullsock_proto; 8141 case BPF_FUNC_sk_storage_get: 8142 return &bpf_sk_storage_get_proto; 8143 case BPF_FUNC_sk_storage_delete: 8144 return &bpf_sk_storage_delete_proto; 8145 #ifdef CONFIG_XFRM 8146 case BPF_FUNC_skb_get_xfrm_state: 8147 return &bpf_skb_get_xfrm_state_proto; 8148 #endif 8149 #ifdef CONFIG_CGROUP_NET_CLASSID 8150 case BPF_FUNC_skb_cgroup_classid: 8151 return &bpf_skb_cgroup_classid_proto; 8152 #endif 8153 #ifdef CONFIG_SOCK_CGROUP_DATA 8154 case BPF_FUNC_skb_cgroup_id: 8155 return &bpf_skb_cgroup_id_proto; 8156 case BPF_FUNC_skb_ancestor_cgroup_id: 8157 return &bpf_skb_ancestor_cgroup_id_proto; 8158 #endif 8159 #ifdef CONFIG_INET 8160 case BPF_FUNC_sk_lookup_tcp: 8161 return &bpf_tc_sk_lookup_tcp_proto; 8162 case BPF_FUNC_sk_lookup_udp: 8163 return &bpf_tc_sk_lookup_udp_proto; 8164 case BPF_FUNC_sk_release: 8165 return &bpf_sk_release_proto; 8166 case BPF_FUNC_tcp_sock: 8167 return &bpf_tcp_sock_proto; 8168 case BPF_FUNC_get_listener_sock: 8169 return &bpf_get_listener_sock_proto; 8170 case BPF_FUNC_skc_lookup_tcp: 8171 return &bpf_tc_skc_lookup_tcp_proto; 8172 case BPF_FUNC_tcp_check_syncookie: 8173 return &bpf_tcp_check_syncookie_proto; 8174 case BPF_FUNC_skb_ecn_set_ce: 8175 return &bpf_skb_ecn_set_ce_proto; 8176 case BPF_FUNC_tcp_gen_syncookie: 8177 return &bpf_tcp_gen_syncookie_proto; 8178 case BPF_FUNC_sk_assign: 8179 return &bpf_sk_assign_proto; 8180 case BPF_FUNC_skb_set_tstamp: 8181 return &bpf_skb_set_tstamp_proto; 8182 #ifdef CONFIG_SYN_COOKIES 8183 case BPF_FUNC_tcp_raw_gen_syncookie_ipv4: 8184 return &bpf_tcp_raw_gen_syncookie_ipv4_proto; 8185 case BPF_FUNC_tcp_raw_gen_syncookie_ipv6: 8186 return &bpf_tcp_raw_gen_syncookie_ipv6_proto; 8187 case BPF_FUNC_tcp_raw_check_syncookie_ipv4: 8188 return &bpf_tcp_raw_check_syncookie_ipv4_proto; 8189 case BPF_FUNC_tcp_raw_check_syncookie_ipv6: 8190 return &bpf_tcp_raw_check_syncookie_ipv6_proto; 8191 #endif 8192 #endif 8193 default: 8194 return bpf_sk_base_func_proto(func_id); 8195 } 8196 } 8197 8198 static const struct bpf_func_proto * 8199 xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8200 { 8201 switch (func_id) { 8202 case BPF_FUNC_perf_event_output: 8203 return &bpf_xdp_event_output_proto; 8204 case BPF_FUNC_get_smp_processor_id: 8205 return &bpf_get_smp_processor_id_proto; 8206 case BPF_FUNC_csum_diff: 8207 return &bpf_csum_diff_proto; 8208 case BPF_FUNC_xdp_adjust_head: 8209 return &bpf_xdp_adjust_head_proto; 8210 case BPF_FUNC_xdp_adjust_meta: 8211 return &bpf_xdp_adjust_meta_proto; 8212 case BPF_FUNC_redirect: 8213 return &bpf_xdp_redirect_proto; 8214 case BPF_FUNC_redirect_map: 8215 return &bpf_xdp_redirect_map_proto; 8216 case BPF_FUNC_xdp_adjust_tail: 8217 return &bpf_xdp_adjust_tail_proto; 8218 case BPF_FUNC_xdp_get_buff_len: 8219 return &bpf_xdp_get_buff_len_proto; 8220 case BPF_FUNC_xdp_load_bytes: 8221 return &bpf_xdp_load_bytes_proto; 8222 case BPF_FUNC_xdp_store_bytes: 8223 return &bpf_xdp_store_bytes_proto; 8224 case BPF_FUNC_fib_lookup: 8225 return &bpf_xdp_fib_lookup_proto; 8226 case BPF_FUNC_check_mtu: 8227 return &bpf_xdp_check_mtu_proto; 8228 #ifdef CONFIG_INET 8229 case BPF_FUNC_sk_lookup_udp: 8230 return &bpf_xdp_sk_lookup_udp_proto; 8231 case BPF_FUNC_sk_lookup_tcp: 8232 return &bpf_xdp_sk_lookup_tcp_proto; 8233 case BPF_FUNC_sk_release: 8234 return &bpf_sk_release_proto; 8235 case BPF_FUNC_skc_lookup_tcp: 8236 return &bpf_xdp_skc_lookup_tcp_proto; 8237 case BPF_FUNC_tcp_check_syncookie: 8238 return &bpf_tcp_check_syncookie_proto; 8239 case BPF_FUNC_tcp_gen_syncookie: 8240 return &bpf_tcp_gen_syncookie_proto; 8241 #ifdef CONFIG_SYN_COOKIES 8242 case BPF_FUNC_tcp_raw_gen_syncookie_ipv4: 8243 return &bpf_tcp_raw_gen_syncookie_ipv4_proto; 8244 case BPF_FUNC_tcp_raw_gen_syncookie_ipv6: 8245 return &bpf_tcp_raw_gen_syncookie_ipv6_proto; 8246 case BPF_FUNC_tcp_raw_check_syncookie_ipv4: 8247 return &bpf_tcp_raw_check_syncookie_ipv4_proto; 8248 case BPF_FUNC_tcp_raw_check_syncookie_ipv6: 8249 return &bpf_tcp_raw_check_syncookie_ipv6_proto; 8250 #endif 8251 #endif 8252 default: 8253 return bpf_sk_base_func_proto(func_id); 8254 } 8255 8256 #if IS_MODULE(CONFIG_NF_CONNTRACK) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES) 8257 /* The nf_conn___init type is used in the NF_CONNTRACK kfuncs. The 8258 * kfuncs are defined in two different modules, and we want to be able 8259 * to use them interchangably with the same BTF type ID. Because modules 8260 * can't de-duplicate BTF IDs between each other, we need the type to be 8261 * referenced in the vmlinux BTF or the verifier will get confused about 8262 * the different types. So we add this dummy type reference which will 8263 * be included in vmlinux BTF, allowing both modules to refer to the 8264 * same type ID. 8265 */ 8266 BTF_TYPE_EMIT(struct nf_conn___init); 8267 #endif 8268 } 8269 8270 const struct bpf_func_proto bpf_sock_map_update_proto __weak; 8271 const struct bpf_func_proto bpf_sock_hash_update_proto __weak; 8272 8273 static const struct bpf_func_proto * 8274 sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8275 { 8276 const struct bpf_func_proto *func_proto; 8277 8278 func_proto = cgroup_common_func_proto(func_id, prog); 8279 if (func_proto) 8280 return func_proto; 8281 8282 switch (func_id) { 8283 case BPF_FUNC_setsockopt: 8284 return &bpf_sock_ops_setsockopt_proto; 8285 case BPF_FUNC_getsockopt: 8286 return &bpf_sock_ops_getsockopt_proto; 8287 case BPF_FUNC_sock_ops_cb_flags_set: 8288 return &bpf_sock_ops_cb_flags_set_proto; 8289 case BPF_FUNC_sock_map_update: 8290 return &bpf_sock_map_update_proto; 8291 case BPF_FUNC_sock_hash_update: 8292 return &bpf_sock_hash_update_proto; 8293 case BPF_FUNC_get_socket_cookie: 8294 return &bpf_get_socket_cookie_sock_ops_proto; 8295 case BPF_FUNC_perf_event_output: 8296 return &bpf_event_output_data_proto; 8297 case BPF_FUNC_sk_storage_get: 8298 return &bpf_sk_storage_get_proto; 8299 case BPF_FUNC_sk_storage_delete: 8300 return &bpf_sk_storage_delete_proto; 8301 case BPF_FUNC_get_netns_cookie: 8302 return &bpf_get_netns_cookie_sock_ops_proto; 8303 #ifdef CONFIG_INET 8304 case BPF_FUNC_load_hdr_opt: 8305 return &bpf_sock_ops_load_hdr_opt_proto; 8306 case BPF_FUNC_store_hdr_opt: 8307 return &bpf_sock_ops_store_hdr_opt_proto; 8308 case BPF_FUNC_reserve_hdr_opt: 8309 return &bpf_sock_ops_reserve_hdr_opt_proto; 8310 case BPF_FUNC_tcp_sock: 8311 return &bpf_tcp_sock_proto; 8312 #endif /* CONFIG_INET */ 8313 default: 8314 return bpf_sk_base_func_proto(func_id); 8315 } 8316 } 8317 8318 const struct bpf_func_proto bpf_msg_redirect_map_proto __weak; 8319 const struct bpf_func_proto bpf_msg_redirect_hash_proto __weak; 8320 8321 static const struct bpf_func_proto * 8322 sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8323 { 8324 switch (func_id) { 8325 case BPF_FUNC_msg_redirect_map: 8326 return &bpf_msg_redirect_map_proto; 8327 case BPF_FUNC_msg_redirect_hash: 8328 return &bpf_msg_redirect_hash_proto; 8329 case BPF_FUNC_msg_apply_bytes: 8330 return &bpf_msg_apply_bytes_proto; 8331 case BPF_FUNC_msg_cork_bytes: 8332 return &bpf_msg_cork_bytes_proto; 8333 case BPF_FUNC_msg_pull_data: 8334 return &bpf_msg_pull_data_proto; 8335 case BPF_FUNC_msg_push_data: 8336 return &bpf_msg_push_data_proto; 8337 case BPF_FUNC_msg_pop_data: 8338 return &bpf_msg_pop_data_proto; 8339 case BPF_FUNC_perf_event_output: 8340 return &bpf_event_output_data_proto; 8341 case BPF_FUNC_get_current_uid_gid: 8342 return &bpf_get_current_uid_gid_proto; 8343 case BPF_FUNC_get_current_pid_tgid: 8344 return &bpf_get_current_pid_tgid_proto; 8345 case BPF_FUNC_sk_storage_get: 8346 return &bpf_sk_storage_get_proto; 8347 case BPF_FUNC_sk_storage_delete: 8348 return &bpf_sk_storage_delete_proto; 8349 case BPF_FUNC_get_netns_cookie: 8350 return &bpf_get_netns_cookie_sk_msg_proto; 8351 #ifdef CONFIG_CGROUP_NET_CLASSID 8352 case BPF_FUNC_get_cgroup_classid: 8353 return &bpf_get_cgroup_classid_curr_proto; 8354 #endif 8355 default: 8356 return bpf_sk_base_func_proto(func_id); 8357 } 8358 } 8359 8360 const struct bpf_func_proto bpf_sk_redirect_map_proto __weak; 8361 const struct bpf_func_proto bpf_sk_redirect_hash_proto __weak; 8362 8363 static const struct bpf_func_proto * 8364 sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8365 { 8366 switch (func_id) { 8367 case BPF_FUNC_skb_store_bytes: 8368 return &bpf_skb_store_bytes_proto; 8369 case BPF_FUNC_skb_load_bytes: 8370 return &bpf_skb_load_bytes_proto; 8371 case BPF_FUNC_skb_pull_data: 8372 return &sk_skb_pull_data_proto; 8373 case BPF_FUNC_skb_change_tail: 8374 return &sk_skb_change_tail_proto; 8375 case BPF_FUNC_skb_change_head: 8376 return &sk_skb_change_head_proto; 8377 case BPF_FUNC_skb_adjust_room: 8378 return &sk_skb_adjust_room_proto; 8379 case BPF_FUNC_get_socket_cookie: 8380 return &bpf_get_socket_cookie_proto; 8381 case BPF_FUNC_get_socket_uid: 8382 return &bpf_get_socket_uid_proto; 8383 case BPF_FUNC_sk_redirect_map: 8384 return &bpf_sk_redirect_map_proto; 8385 case BPF_FUNC_sk_redirect_hash: 8386 return &bpf_sk_redirect_hash_proto; 8387 case BPF_FUNC_perf_event_output: 8388 return &bpf_skb_event_output_proto; 8389 #ifdef CONFIG_INET 8390 case BPF_FUNC_sk_lookup_tcp: 8391 return &bpf_sk_lookup_tcp_proto; 8392 case BPF_FUNC_sk_lookup_udp: 8393 return &bpf_sk_lookup_udp_proto; 8394 case BPF_FUNC_sk_release: 8395 return &bpf_sk_release_proto; 8396 case BPF_FUNC_skc_lookup_tcp: 8397 return &bpf_skc_lookup_tcp_proto; 8398 #endif 8399 default: 8400 return bpf_sk_base_func_proto(func_id); 8401 } 8402 } 8403 8404 static const struct bpf_func_proto * 8405 flow_dissector_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8406 { 8407 switch (func_id) { 8408 case BPF_FUNC_skb_load_bytes: 8409 return &bpf_flow_dissector_load_bytes_proto; 8410 default: 8411 return bpf_sk_base_func_proto(func_id); 8412 } 8413 } 8414 8415 static const struct bpf_func_proto * 8416 lwt_out_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8417 { 8418 switch (func_id) { 8419 case BPF_FUNC_skb_load_bytes: 8420 return &bpf_skb_load_bytes_proto; 8421 case BPF_FUNC_skb_pull_data: 8422 return &bpf_skb_pull_data_proto; 8423 case BPF_FUNC_csum_diff: 8424 return &bpf_csum_diff_proto; 8425 case BPF_FUNC_get_cgroup_classid: 8426 return &bpf_get_cgroup_classid_proto; 8427 case BPF_FUNC_get_route_realm: 8428 return &bpf_get_route_realm_proto; 8429 case BPF_FUNC_get_hash_recalc: 8430 return &bpf_get_hash_recalc_proto; 8431 case BPF_FUNC_perf_event_output: 8432 return &bpf_skb_event_output_proto; 8433 case BPF_FUNC_get_smp_processor_id: 8434 return &bpf_get_smp_processor_id_proto; 8435 case BPF_FUNC_skb_under_cgroup: 8436 return &bpf_skb_under_cgroup_proto; 8437 default: 8438 return bpf_sk_base_func_proto(func_id); 8439 } 8440 } 8441 8442 static const struct bpf_func_proto * 8443 lwt_in_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8444 { 8445 switch (func_id) { 8446 case BPF_FUNC_lwt_push_encap: 8447 return &bpf_lwt_in_push_encap_proto; 8448 default: 8449 return lwt_out_func_proto(func_id, prog); 8450 } 8451 } 8452 8453 static const struct bpf_func_proto * 8454 lwt_xmit_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8455 { 8456 switch (func_id) { 8457 case BPF_FUNC_skb_get_tunnel_key: 8458 return &bpf_skb_get_tunnel_key_proto; 8459 case BPF_FUNC_skb_set_tunnel_key: 8460 return bpf_get_skb_set_tunnel_proto(func_id); 8461 case BPF_FUNC_skb_get_tunnel_opt: 8462 return &bpf_skb_get_tunnel_opt_proto; 8463 case BPF_FUNC_skb_set_tunnel_opt: 8464 return bpf_get_skb_set_tunnel_proto(func_id); 8465 case BPF_FUNC_redirect: 8466 return &bpf_redirect_proto; 8467 case BPF_FUNC_clone_redirect: 8468 return &bpf_clone_redirect_proto; 8469 case BPF_FUNC_skb_change_tail: 8470 return &bpf_skb_change_tail_proto; 8471 case BPF_FUNC_skb_change_head: 8472 return &bpf_skb_change_head_proto; 8473 case BPF_FUNC_skb_store_bytes: 8474 return &bpf_skb_store_bytes_proto; 8475 case BPF_FUNC_csum_update: 8476 return &bpf_csum_update_proto; 8477 case BPF_FUNC_csum_level: 8478 return &bpf_csum_level_proto; 8479 case BPF_FUNC_l3_csum_replace: 8480 return &bpf_l3_csum_replace_proto; 8481 case BPF_FUNC_l4_csum_replace: 8482 return &bpf_l4_csum_replace_proto; 8483 case BPF_FUNC_set_hash_invalid: 8484 return &bpf_set_hash_invalid_proto; 8485 case BPF_FUNC_lwt_push_encap: 8486 return &bpf_lwt_xmit_push_encap_proto; 8487 default: 8488 return lwt_out_func_proto(func_id, prog); 8489 } 8490 } 8491 8492 static const struct bpf_func_proto * 8493 lwt_seg6local_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 8494 { 8495 switch (func_id) { 8496 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) 8497 case BPF_FUNC_lwt_seg6_store_bytes: 8498 return &bpf_lwt_seg6_store_bytes_proto; 8499 case BPF_FUNC_lwt_seg6_action: 8500 return &bpf_lwt_seg6_action_proto; 8501 case BPF_FUNC_lwt_seg6_adjust_srh: 8502 return &bpf_lwt_seg6_adjust_srh_proto; 8503 #endif 8504 default: 8505 return lwt_out_func_proto(func_id, prog); 8506 } 8507 } 8508 8509 static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type, 8510 const struct bpf_prog *prog, 8511 struct bpf_insn_access_aux *info) 8512 { 8513 const int size_default = sizeof(__u32); 8514 8515 if (off < 0 || off >= sizeof(struct __sk_buff)) 8516 return false; 8517 8518 /* The verifier guarantees that size > 0. */ 8519 if (off % size != 0) 8520 return false; 8521 8522 switch (off) { 8523 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8524 if (off + size > offsetofend(struct __sk_buff, cb[4])) 8525 return false; 8526 break; 8527 case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]): 8528 case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]): 8529 case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4): 8530 case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4): 8531 case bpf_ctx_range(struct __sk_buff, data): 8532 case bpf_ctx_range(struct __sk_buff, data_meta): 8533 case bpf_ctx_range(struct __sk_buff, data_end): 8534 if (size != size_default) 8535 return false; 8536 break; 8537 case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): 8538 return false; 8539 case bpf_ctx_range(struct __sk_buff, hwtstamp): 8540 if (type == BPF_WRITE || size != sizeof(__u64)) 8541 return false; 8542 break; 8543 case bpf_ctx_range(struct __sk_buff, tstamp): 8544 if (size != sizeof(__u64)) 8545 return false; 8546 break; 8547 case offsetof(struct __sk_buff, sk): 8548 if (type == BPF_WRITE || size != sizeof(__u64)) 8549 return false; 8550 info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL; 8551 break; 8552 case offsetof(struct __sk_buff, tstamp_type): 8553 return false; 8554 case offsetofend(struct __sk_buff, tstamp_type) ... offsetof(struct __sk_buff, hwtstamp) - 1: 8555 /* Explicitly prohibit access to padding in __sk_buff. */ 8556 return false; 8557 default: 8558 /* Only narrow read access allowed for now. */ 8559 if (type == BPF_WRITE) { 8560 if (size != size_default) 8561 return false; 8562 } else { 8563 bpf_ctx_record_field_size(info, size_default); 8564 if (!bpf_ctx_narrow_access_ok(off, size, size_default)) 8565 return false; 8566 } 8567 } 8568 8569 return true; 8570 } 8571 8572 static bool sk_filter_is_valid_access(int off, int size, 8573 enum bpf_access_type type, 8574 const struct bpf_prog *prog, 8575 struct bpf_insn_access_aux *info) 8576 { 8577 switch (off) { 8578 case bpf_ctx_range(struct __sk_buff, tc_classid): 8579 case bpf_ctx_range(struct __sk_buff, data): 8580 case bpf_ctx_range(struct __sk_buff, data_meta): 8581 case bpf_ctx_range(struct __sk_buff, data_end): 8582 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 8583 case bpf_ctx_range(struct __sk_buff, tstamp): 8584 case bpf_ctx_range(struct __sk_buff, wire_len): 8585 case bpf_ctx_range(struct __sk_buff, hwtstamp): 8586 return false; 8587 } 8588 8589 if (type == BPF_WRITE) { 8590 switch (off) { 8591 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8592 break; 8593 default: 8594 return false; 8595 } 8596 } 8597 8598 return bpf_skb_is_valid_access(off, size, type, prog, info); 8599 } 8600 8601 static bool cg_skb_is_valid_access(int off, int size, 8602 enum bpf_access_type type, 8603 const struct bpf_prog *prog, 8604 struct bpf_insn_access_aux *info) 8605 { 8606 switch (off) { 8607 case bpf_ctx_range(struct __sk_buff, tc_classid): 8608 case bpf_ctx_range(struct __sk_buff, data_meta): 8609 case bpf_ctx_range(struct __sk_buff, wire_len): 8610 return false; 8611 case bpf_ctx_range(struct __sk_buff, data): 8612 case bpf_ctx_range(struct __sk_buff, data_end): 8613 if (!bpf_capable()) 8614 return false; 8615 break; 8616 } 8617 8618 if (type == BPF_WRITE) { 8619 switch (off) { 8620 case bpf_ctx_range(struct __sk_buff, mark): 8621 case bpf_ctx_range(struct __sk_buff, priority): 8622 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8623 break; 8624 case bpf_ctx_range(struct __sk_buff, tstamp): 8625 if (!bpf_capable()) 8626 return false; 8627 break; 8628 default: 8629 return false; 8630 } 8631 } 8632 8633 switch (off) { 8634 case bpf_ctx_range(struct __sk_buff, data): 8635 info->reg_type = PTR_TO_PACKET; 8636 break; 8637 case bpf_ctx_range(struct __sk_buff, data_end): 8638 info->reg_type = PTR_TO_PACKET_END; 8639 break; 8640 } 8641 8642 return bpf_skb_is_valid_access(off, size, type, prog, info); 8643 } 8644 8645 static bool lwt_is_valid_access(int off, int size, 8646 enum bpf_access_type type, 8647 const struct bpf_prog *prog, 8648 struct bpf_insn_access_aux *info) 8649 { 8650 switch (off) { 8651 case bpf_ctx_range(struct __sk_buff, tc_classid): 8652 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 8653 case bpf_ctx_range(struct __sk_buff, data_meta): 8654 case bpf_ctx_range(struct __sk_buff, tstamp): 8655 case bpf_ctx_range(struct __sk_buff, wire_len): 8656 case bpf_ctx_range(struct __sk_buff, hwtstamp): 8657 return false; 8658 } 8659 8660 if (type == BPF_WRITE) { 8661 switch (off) { 8662 case bpf_ctx_range(struct __sk_buff, mark): 8663 case bpf_ctx_range(struct __sk_buff, priority): 8664 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8665 break; 8666 default: 8667 return false; 8668 } 8669 } 8670 8671 switch (off) { 8672 case bpf_ctx_range(struct __sk_buff, data): 8673 info->reg_type = PTR_TO_PACKET; 8674 break; 8675 case bpf_ctx_range(struct __sk_buff, data_end): 8676 info->reg_type = PTR_TO_PACKET_END; 8677 break; 8678 } 8679 8680 return bpf_skb_is_valid_access(off, size, type, prog, info); 8681 } 8682 8683 /* Attach type specific accesses */ 8684 static bool __sock_filter_check_attach_type(int off, 8685 enum bpf_access_type access_type, 8686 enum bpf_attach_type attach_type) 8687 { 8688 switch (off) { 8689 case offsetof(struct bpf_sock, bound_dev_if): 8690 case offsetof(struct bpf_sock, mark): 8691 case offsetof(struct bpf_sock, priority): 8692 switch (attach_type) { 8693 case BPF_CGROUP_INET_SOCK_CREATE: 8694 case BPF_CGROUP_INET_SOCK_RELEASE: 8695 goto full_access; 8696 default: 8697 return false; 8698 } 8699 case bpf_ctx_range(struct bpf_sock, src_ip4): 8700 switch (attach_type) { 8701 case BPF_CGROUP_INET4_POST_BIND: 8702 goto read_only; 8703 default: 8704 return false; 8705 } 8706 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 8707 switch (attach_type) { 8708 case BPF_CGROUP_INET6_POST_BIND: 8709 goto read_only; 8710 default: 8711 return false; 8712 } 8713 case bpf_ctx_range(struct bpf_sock, src_port): 8714 switch (attach_type) { 8715 case BPF_CGROUP_INET4_POST_BIND: 8716 case BPF_CGROUP_INET6_POST_BIND: 8717 goto read_only; 8718 default: 8719 return false; 8720 } 8721 } 8722 read_only: 8723 return access_type == BPF_READ; 8724 full_access: 8725 return true; 8726 } 8727 8728 bool bpf_sock_common_is_valid_access(int off, int size, 8729 enum bpf_access_type type, 8730 struct bpf_insn_access_aux *info) 8731 { 8732 switch (off) { 8733 case bpf_ctx_range_till(struct bpf_sock, type, priority): 8734 return false; 8735 default: 8736 return bpf_sock_is_valid_access(off, size, type, info); 8737 } 8738 } 8739 8740 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, 8741 struct bpf_insn_access_aux *info) 8742 { 8743 const int size_default = sizeof(__u32); 8744 int field_size; 8745 8746 if (off < 0 || off >= sizeof(struct bpf_sock)) 8747 return false; 8748 if (off % size != 0) 8749 return false; 8750 8751 switch (off) { 8752 case offsetof(struct bpf_sock, state): 8753 case offsetof(struct bpf_sock, family): 8754 case offsetof(struct bpf_sock, type): 8755 case offsetof(struct bpf_sock, protocol): 8756 case offsetof(struct bpf_sock, src_port): 8757 case offsetof(struct bpf_sock, rx_queue_mapping): 8758 case bpf_ctx_range(struct bpf_sock, src_ip4): 8759 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 8760 case bpf_ctx_range(struct bpf_sock, dst_ip4): 8761 case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): 8762 bpf_ctx_record_field_size(info, size_default); 8763 return bpf_ctx_narrow_access_ok(off, size, size_default); 8764 case bpf_ctx_range(struct bpf_sock, dst_port): 8765 field_size = size == size_default ? 8766 size_default : sizeof_field(struct bpf_sock, dst_port); 8767 bpf_ctx_record_field_size(info, field_size); 8768 return bpf_ctx_narrow_access_ok(off, size, field_size); 8769 case offsetofend(struct bpf_sock, dst_port) ... 8770 offsetof(struct bpf_sock, dst_ip4) - 1: 8771 return false; 8772 } 8773 8774 return size == size_default; 8775 } 8776 8777 static bool sock_filter_is_valid_access(int off, int size, 8778 enum bpf_access_type type, 8779 const struct bpf_prog *prog, 8780 struct bpf_insn_access_aux *info) 8781 { 8782 if (!bpf_sock_is_valid_access(off, size, type, info)) 8783 return false; 8784 return __sock_filter_check_attach_type(off, type, 8785 prog->expected_attach_type); 8786 } 8787 8788 static int bpf_noop_prologue(struct bpf_insn *insn_buf, bool direct_write, 8789 const struct bpf_prog *prog) 8790 { 8791 /* Neither direct read nor direct write requires any preliminary 8792 * action. 8793 */ 8794 return 0; 8795 } 8796 8797 static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write, 8798 const struct bpf_prog *prog, int drop_verdict) 8799 { 8800 struct bpf_insn *insn = insn_buf; 8801 8802 if (!direct_write) 8803 return 0; 8804 8805 /* if (!skb->cloned) 8806 * goto start; 8807 * 8808 * (Fast-path, otherwise approximation that we might be 8809 * a clone, do the rest in helper.) 8810 */ 8811 *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET); 8812 *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK); 8813 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7); 8814 8815 /* ret = bpf_skb_pull_data(skb, 0); */ 8816 *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1); 8817 *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2); 8818 *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, 8819 BPF_FUNC_skb_pull_data); 8820 /* if (!ret) 8821 * goto restore; 8822 * return TC_ACT_SHOT; 8823 */ 8824 *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2); 8825 *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict); 8826 *insn++ = BPF_EXIT_INSN(); 8827 8828 /* restore: */ 8829 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6); 8830 /* start: */ 8831 *insn++ = prog->insnsi[0]; 8832 8833 return insn - insn_buf; 8834 } 8835 8836 static int bpf_gen_ld_abs(const struct bpf_insn *orig, 8837 struct bpf_insn *insn_buf) 8838 { 8839 bool indirect = BPF_MODE(orig->code) == BPF_IND; 8840 struct bpf_insn *insn = insn_buf; 8841 8842 if (!indirect) { 8843 *insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm); 8844 } else { 8845 *insn++ = BPF_MOV64_REG(BPF_REG_2, orig->src_reg); 8846 if (orig->imm) 8847 *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm); 8848 } 8849 /* We're guaranteed here that CTX is in R6. */ 8850 *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX); 8851 8852 switch (BPF_SIZE(orig->code)) { 8853 case BPF_B: 8854 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache); 8855 break; 8856 case BPF_H: 8857 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache); 8858 break; 8859 case BPF_W: 8860 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache); 8861 break; 8862 } 8863 8864 *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 2); 8865 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0); 8866 *insn++ = BPF_EXIT_INSN(); 8867 8868 return insn - insn_buf; 8869 } 8870 8871 static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write, 8872 const struct bpf_prog *prog) 8873 { 8874 return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT); 8875 } 8876 8877 static bool tc_cls_act_is_valid_access(int off, int size, 8878 enum bpf_access_type type, 8879 const struct bpf_prog *prog, 8880 struct bpf_insn_access_aux *info) 8881 { 8882 if (type == BPF_WRITE) { 8883 switch (off) { 8884 case bpf_ctx_range(struct __sk_buff, mark): 8885 case bpf_ctx_range(struct __sk_buff, tc_index): 8886 case bpf_ctx_range(struct __sk_buff, priority): 8887 case bpf_ctx_range(struct __sk_buff, tc_classid): 8888 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): 8889 case bpf_ctx_range(struct __sk_buff, tstamp): 8890 case bpf_ctx_range(struct __sk_buff, queue_mapping): 8891 break; 8892 default: 8893 return false; 8894 } 8895 } 8896 8897 switch (off) { 8898 case bpf_ctx_range(struct __sk_buff, data): 8899 info->reg_type = PTR_TO_PACKET; 8900 break; 8901 case bpf_ctx_range(struct __sk_buff, data_meta): 8902 info->reg_type = PTR_TO_PACKET_META; 8903 break; 8904 case bpf_ctx_range(struct __sk_buff, data_end): 8905 info->reg_type = PTR_TO_PACKET_END; 8906 break; 8907 case bpf_ctx_range_till(struct __sk_buff, family, local_port): 8908 return false; 8909 case offsetof(struct __sk_buff, tstamp_type): 8910 /* The convert_ctx_access() on reading and writing 8911 * __sk_buff->tstamp depends on whether the bpf prog 8912 * has used __sk_buff->tstamp_type or not. 8913 * Thus, we need to set prog->tstamp_type_access 8914 * earlier during is_valid_access() here. 8915 */ 8916 ((struct bpf_prog *)prog)->tstamp_type_access = 1; 8917 return size == sizeof(__u8); 8918 } 8919 8920 return bpf_skb_is_valid_access(off, size, type, prog, info); 8921 } 8922 8923 DEFINE_MUTEX(nf_conn_btf_access_lock); 8924 EXPORT_SYMBOL_GPL(nf_conn_btf_access_lock); 8925 8926 int (*nfct_btf_struct_access)(struct bpf_verifier_log *log, 8927 const struct bpf_reg_state *reg, 8928 int off, int size); 8929 EXPORT_SYMBOL_GPL(nfct_btf_struct_access); 8930 8931 static int tc_cls_act_btf_struct_access(struct bpf_verifier_log *log, 8932 const struct bpf_reg_state *reg, 8933 int off, int size) 8934 { 8935 int ret = -EACCES; 8936 8937 mutex_lock(&nf_conn_btf_access_lock); 8938 if (nfct_btf_struct_access) 8939 ret = nfct_btf_struct_access(log, reg, off, size); 8940 mutex_unlock(&nf_conn_btf_access_lock); 8941 8942 return ret; 8943 } 8944 8945 static bool __is_valid_xdp_access(int off, int size) 8946 { 8947 if (off < 0 || off >= sizeof(struct xdp_md)) 8948 return false; 8949 if (off % size != 0) 8950 return false; 8951 if (size != sizeof(__u32)) 8952 return false; 8953 8954 return true; 8955 } 8956 8957 static bool xdp_is_valid_access(int off, int size, 8958 enum bpf_access_type type, 8959 const struct bpf_prog *prog, 8960 struct bpf_insn_access_aux *info) 8961 { 8962 if (prog->expected_attach_type != BPF_XDP_DEVMAP) { 8963 switch (off) { 8964 case offsetof(struct xdp_md, egress_ifindex): 8965 return false; 8966 } 8967 } 8968 8969 if (type == BPF_WRITE) { 8970 if (bpf_prog_is_offloaded(prog->aux)) { 8971 switch (off) { 8972 case offsetof(struct xdp_md, rx_queue_index): 8973 return __is_valid_xdp_access(off, size); 8974 } 8975 } 8976 return false; 8977 } 8978 8979 switch (off) { 8980 case offsetof(struct xdp_md, data): 8981 info->reg_type = PTR_TO_PACKET; 8982 break; 8983 case offsetof(struct xdp_md, data_meta): 8984 info->reg_type = PTR_TO_PACKET_META; 8985 break; 8986 case offsetof(struct xdp_md, data_end): 8987 info->reg_type = PTR_TO_PACKET_END; 8988 break; 8989 } 8990 8991 return __is_valid_xdp_access(off, size); 8992 } 8993 8994 void bpf_warn_invalid_xdp_action(struct net_device *dev, struct bpf_prog *prog, u32 act) 8995 { 8996 const u32 act_max = XDP_REDIRECT; 8997 8998 pr_warn_once("%s XDP return value %u on prog %s (id %d) dev %s, expect packet loss!\n", 8999 act > act_max ? "Illegal" : "Driver unsupported", 9000 act, prog->aux->name, prog->aux->id, dev ? dev->name : "N/A"); 9001 } 9002 EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action); 9003 9004 static int xdp_btf_struct_access(struct bpf_verifier_log *log, 9005 const struct bpf_reg_state *reg, 9006 int off, int size) 9007 { 9008 int ret = -EACCES; 9009 9010 mutex_lock(&nf_conn_btf_access_lock); 9011 if (nfct_btf_struct_access) 9012 ret = nfct_btf_struct_access(log, reg, off, size); 9013 mutex_unlock(&nf_conn_btf_access_lock); 9014 9015 return ret; 9016 } 9017 9018 static bool sock_addr_is_valid_access(int off, int size, 9019 enum bpf_access_type type, 9020 const struct bpf_prog *prog, 9021 struct bpf_insn_access_aux *info) 9022 { 9023 const int size_default = sizeof(__u32); 9024 9025 if (off < 0 || off >= sizeof(struct bpf_sock_addr)) 9026 return false; 9027 if (off % size != 0) 9028 return false; 9029 9030 /* Disallow access to IPv6 fields from IPv4 contex and vise 9031 * versa. 9032 */ 9033 switch (off) { 9034 case bpf_ctx_range(struct bpf_sock_addr, user_ip4): 9035 switch (prog->expected_attach_type) { 9036 case BPF_CGROUP_INET4_BIND: 9037 case BPF_CGROUP_INET4_CONNECT: 9038 case BPF_CGROUP_INET4_GETPEERNAME: 9039 case BPF_CGROUP_INET4_GETSOCKNAME: 9040 case BPF_CGROUP_UDP4_SENDMSG: 9041 case BPF_CGROUP_UDP4_RECVMSG: 9042 break; 9043 default: 9044 return false; 9045 } 9046 break; 9047 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 9048 switch (prog->expected_attach_type) { 9049 case BPF_CGROUP_INET6_BIND: 9050 case BPF_CGROUP_INET6_CONNECT: 9051 case BPF_CGROUP_INET6_GETPEERNAME: 9052 case BPF_CGROUP_INET6_GETSOCKNAME: 9053 case BPF_CGROUP_UDP6_SENDMSG: 9054 case BPF_CGROUP_UDP6_RECVMSG: 9055 break; 9056 default: 9057 return false; 9058 } 9059 break; 9060 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): 9061 switch (prog->expected_attach_type) { 9062 case BPF_CGROUP_UDP4_SENDMSG: 9063 break; 9064 default: 9065 return false; 9066 } 9067 break; 9068 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 9069 msg_src_ip6[3]): 9070 switch (prog->expected_attach_type) { 9071 case BPF_CGROUP_UDP6_SENDMSG: 9072 break; 9073 default: 9074 return false; 9075 } 9076 break; 9077 } 9078 9079 switch (off) { 9080 case bpf_ctx_range(struct bpf_sock_addr, user_ip4): 9081 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 9082 case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): 9083 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 9084 msg_src_ip6[3]): 9085 case bpf_ctx_range(struct bpf_sock_addr, user_port): 9086 if (type == BPF_READ) { 9087 bpf_ctx_record_field_size(info, size_default); 9088 9089 if (bpf_ctx_wide_access_ok(off, size, 9090 struct bpf_sock_addr, 9091 user_ip6)) 9092 return true; 9093 9094 if (bpf_ctx_wide_access_ok(off, size, 9095 struct bpf_sock_addr, 9096 msg_src_ip6)) 9097 return true; 9098 9099 if (!bpf_ctx_narrow_access_ok(off, size, size_default)) 9100 return false; 9101 } else { 9102 if (bpf_ctx_wide_access_ok(off, size, 9103 struct bpf_sock_addr, 9104 user_ip6)) 9105 return true; 9106 9107 if (bpf_ctx_wide_access_ok(off, size, 9108 struct bpf_sock_addr, 9109 msg_src_ip6)) 9110 return true; 9111 9112 if (size != size_default) 9113 return false; 9114 } 9115 break; 9116 case offsetof(struct bpf_sock_addr, sk): 9117 if (type != BPF_READ) 9118 return false; 9119 if (size != sizeof(__u64)) 9120 return false; 9121 info->reg_type = PTR_TO_SOCKET; 9122 break; 9123 default: 9124 if (type == BPF_READ) { 9125 if (size != size_default) 9126 return false; 9127 } else { 9128 return false; 9129 } 9130 } 9131 9132 return true; 9133 } 9134 9135 static bool sock_ops_is_valid_access(int off, int size, 9136 enum bpf_access_type type, 9137 const struct bpf_prog *prog, 9138 struct bpf_insn_access_aux *info) 9139 { 9140 const int size_default = sizeof(__u32); 9141 9142 if (off < 0 || off >= sizeof(struct bpf_sock_ops)) 9143 return false; 9144 9145 /* The verifier guarantees that size > 0. */ 9146 if (off % size != 0) 9147 return false; 9148 9149 if (type == BPF_WRITE) { 9150 switch (off) { 9151 case offsetof(struct bpf_sock_ops, reply): 9152 case offsetof(struct bpf_sock_ops, sk_txhash): 9153 if (size != size_default) 9154 return false; 9155 break; 9156 default: 9157 return false; 9158 } 9159 } else { 9160 switch (off) { 9161 case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received, 9162 bytes_acked): 9163 if (size != sizeof(__u64)) 9164 return false; 9165 break; 9166 case offsetof(struct bpf_sock_ops, sk): 9167 if (size != sizeof(__u64)) 9168 return false; 9169 info->reg_type = PTR_TO_SOCKET_OR_NULL; 9170 break; 9171 case offsetof(struct bpf_sock_ops, skb_data): 9172 if (size != sizeof(__u64)) 9173 return false; 9174 info->reg_type = PTR_TO_PACKET; 9175 break; 9176 case offsetof(struct bpf_sock_ops, skb_data_end): 9177 if (size != sizeof(__u64)) 9178 return false; 9179 info->reg_type = PTR_TO_PACKET_END; 9180 break; 9181 case offsetof(struct bpf_sock_ops, skb_tcp_flags): 9182 bpf_ctx_record_field_size(info, size_default); 9183 return bpf_ctx_narrow_access_ok(off, size, 9184 size_default); 9185 case offsetof(struct bpf_sock_ops, skb_hwtstamp): 9186 if (size != sizeof(__u64)) 9187 return false; 9188 break; 9189 default: 9190 if (size != size_default) 9191 return false; 9192 break; 9193 } 9194 } 9195 9196 return true; 9197 } 9198 9199 static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write, 9200 const struct bpf_prog *prog) 9201 { 9202 return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP); 9203 } 9204 9205 static bool sk_skb_is_valid_access(int off, int size, 9206 enum bpf_access_type type, 9207 const struct bpf_prog *prog, 9208 struct bpf_insn_access_aux *info) 9209 { 9210 switch (off) { 9211 case bpf_ctx_range(struct __sk_buff, tc_classid): 9212 case bpf_ctx_range(struct __sk_buff, data_meta): 9213 case bpf_ctx_range(struct __sk_buff, tstamp): 9214 case bpf_ctx_range(struct __sk_buff, wire_len): 9215 case bpf_ctx_range(struct __sk_buff, hwtstamp): 9216 return false; 9217 } 9218 9219 if (type == BPF_WRITE) { 9220 switch (off) { 9221 case bpf_ctx_range(struct __sk_buff, tc_index): 9222 case bpf_ctx_range(struct __sk_buff, priority): 9223 break; 9224 default: 9225 return false; 9226 } 9227 } 9228 9229 switch (off) { 9230 case bpf_ctx_range(struct __sk_buff, mark): 9231 return false; 9232 case bpf_ctx_range(struct __sk_buff, data): 9233 info->reg_type = PTR_TO_PACKET; 9234 break; 9235 case bpf_ctx_range(struct __sk_buff, data_end): 9236 info->reg_type = PTR_TO_PACKET_END; 9237 break; 9238 } 9239 9240 return bpf_skb_is_valid_access(off, size, type, prog, info); 9241 } 9242 9243 static bool sk_msg_is_valid_access(int off, int size, 9244 enum bpf_access_type type, 9245 const struct bpf_prog *prog, 9246 struct bpf_insn_access_aux *info) 9247 { 9248 if (type == BPF_WRITE) 9249 return false; 9250 9251 if (off % size != 0) 9252 return false; 9253 9254 switch (off) { 9255 case offsetof(struct sk_msg_md, data): 9256 info->reg_type = PTR_TO_PACKET; 9257 if (size != sizeof(__u64)) 9258 return false; 9259 break; 9260 case offsetof(struct sk_msg_md, data_end): 9261 info->reg_type = PTR_TO_PACKET_END; 9262 if (size != sizeof(__u64)) 9263 return false; 9264 break; 9265 case offsetof(struct sk_msg_md, sk): 9266 if (size != sizeof(__u64)) 9267 return false; 9268 info->reg_type = PTR_TO_SOCKET; 9269 break; 9270 case bpf_ctx_range(struct sk_msg_md, family): 9271 case bpf_ctx_range(struct sk_msg_md, remote_ip4): 9272 case bpf_ctx_range(struct sk_msg_md, local_ip4): 9273 case bpf_ctx_range_till(struct sk_msg_md, remote_ip6[0], remote_ip6[3]): 9274 case bpf_ctx_range_till(struct sk_msg_md, local_ip6[0], local_ip6[3]): 9275 case bpf_ctx_range(struct sk_msg_md, remote_port): 9276 case bpf_ctx_range(struct sk_msg_md, local_port): 9277 case bpf_ctx_range(struct sk_msg_md, size): 9278 if (size != sizeof(__u32)) 9279 return false; 9280 break; 9281 default: 9282 return false; 9283 } 9284 return true; 9285 } 9286 9287 static bool flow_dissector_is_valid_access(int off, int size, 9288 enum bpf_access_type type, 9289 const struct bpf_prog *prog, 9290 struct bpf_insn_access_aux *info) 9291 { 9292 const int size_default = sizeof(__u32); 9293 9294 if (off < 0 || off >= sizeof(struct __sk_buff)) 9295 return false; 9296 9297 if (type == BPF_WRITE) 9298 return false; 9299 9300 switch (off) { 9301 case bpf_ctx_range(struct __sk_buff, data): 9302 if (size != size_default) 9303 return false; 9304 info->reg_type = PTR_TO_PACKET; 9305 return true; 9306 case bpf_ctx_range(struct __sk_buff, data_end): 9307 if (size != size_default) 9308 return false; 9309 info->reg_type = PTR_TO_PACKET_END; 9310 return true; 9311 case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): 9312 if (size != sizeof(__u64)) 9313 return false; 9314 info->reg_type = PTR_TO_FLOW_KEYS; 9315 return true; 9316 default: 9317 return false; 9318 } 9319 } 9320 9321 static u32 flow_dissector_convert_ctx_access(enum bpf_access_type type, 9322 const struct bpf_insn *si, 9323 struct bpf_insn *insn_buf, 9324 struct bpf_prog *prog, 9325 u32 *target_size) 9326 9327 { 9328 struct bpf_insn *insn = insn_buf; 9329 9330 switch (si->off) { 9331 case offsetof(struct __sk_buff, data): 9332 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data), 9333 si->dst_reg, si->src_reg, 9334 offsetof(struct bpf_flow_dissector, data)); 9335 break; 9336 9337 case offsetof(struct __sk_buff, data_end): 9338 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data_end), 9339 si->dst_reg, si->src_reg, 9340 offsetof(struct bpf_flow_dissector, data_end)); 9341 break; 9342 9343 case offsetof(struct __sk_buff, flow_keys): 9344 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, flow_keys), 9345 si->dst_reg, si->src_reg, 9346 offsetof(struct bpf_flow_dissector, flow_keys)); 9347 break; 9348 } 9349 9350 return insn - insn_buf; 9351 } 9352 9353 static struct bpf_insn *bpf_convert_tstamp_type_read(const struct bpf_insn *si, 9354 struct bpf_insn *insn) 9355 { 9356 __u8 value_reg = si->dst_reg; 9357 __u8 skb_reg = si->src_reg; 9358 /* AX is needed because src_reg and dst_reg could be the same */ 9359 __u8 tmp_reg = BPF_REG_AX; 9360 9361 *insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg, 9362 SKB_BF_MONO_TC_OFFSET); 9363 *insn++ = BPF_JMP32_IMM(BPF_JSET, tmp_reg, 9364 SKB_MONO_DELIVERY_TIME_MASK, 2); 9365 *insn++ = BPF_MOV32_IMM(value_reg, BPF_SKB_TSTAMP_UNSPEC); 9366 *insn++ = BPF_JMP_A(1); 9367 *insn++ = BPF_MOV32_IMM(value_reg, BPF_SKB_TSTAMP_DELIVERY_MONO); 9368 9369 return insn; 9370 } 9371 9372 static struct bpf_insn *bpf_convert_shinfo_access(__u8 dst_reg, __u8 skb_reg, 9373 struct bpf_insn *insn) 9374 { 9375 /* si->dst_reg = skb_shinfo(SKB); */ 9376 #ifdef NET_SKBUFF_DATA_USES_OFFSET 9377 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), 9378 BPF_REG_AX, skb_reg, 9379 offsetof(struct sk_buff, end)); 9380 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, head), 9381 dst_reg, skb_reg, 9382 offsetof(struct sk_buff, head)); 9383 *insn++ = BPF_ALU64_REG(BPF_ADD, dst_reg, BPF_REG_AX); 9384 #else 9385 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), 9386 dst_reg, skb_reg, 9387 offsetof(struct sk_buff, end)); 9388 #endif 9389 9390 return insn; 9391 } 9392 9393 static struct bpf_insn *bpf_convert_tstamp_read(const struct bpf_prog *prog, 9394 const struct bpf_insn *si, 9395 struct bpf_insn *insn) 9396 { 9397 __u8 value_reg = si->dst_reg; 9398 __u8 skb_reg = si->src_reg; 9399 9400 #ifdef CONFIG_NET_XGRESS 9401 /* If the tstamp_type is read, 9402 * the bpf prog is aware the tstamp could have delivery time. 9403 * Thus, read skb->tstamp as is if tstamp_type_access is true. 9404 */ 9405 if (!prog->tstamp_type_access) { 9406 /* AX is needed because src_reg and dst_reg could be the same */ 9407 __u8 tmp_reg = BPF_REG_AX; 9408 9409 *insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg, SKB_BF_MONO_TC_OFFSET); 9410 *insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg, 9411 TC_AT_INGRESS_MASK | SKB_MONO_DELIVERY_TIME_MASK); 9412 *insn++ = BPF_JMP32_IMM(BPF_JNE, tmp_reg, 9413 TC_AT_INGRESS_MASK | SKB_MONO_DELIVERY_TIME_MASK, 2); 9414 /* skb->tc_at_ingress && skb->mono_delivery_time, 9415 * read 0 as the (rcv) timestamp. 9416 */ 9417 *insn++ = BPF_MOV64_IMM(value_reg, 0); 9418 *insn++ = BPF_JMP_A(1); 9419 } 9420 #endif 9421 9422 *insn++ = BPF_LDX_MEM(BPF_DW, value_reg, skb_reg, 9423 offsetof(struct sk_buff, tstamp)); 9424 return insn; 9425 } 9426 9427 static struct bpf_insn *bpf_convert_tstamp_write(const struct bpf_prog *prog, 9428 const struct bpf_insn *si, 9429 struct bpf_insn *insn) 9430 { 9431 __u8 value_reg = si->src_reg; 9432 __u8 skb_reg = si->dst_reg; 9433 9434 #ifdef CONFIG_NET_XGRESS 9435 /* If the tstamp_type is read, 9436 * the bpf prog is aware the tstamp could have delivery time. 9437 * Thus, write skb->tstamp as is if tstamp_type_access is true. 9438 * Otherwise, writing at ingress will have to clear the 9439 * mono_delivery_time bit also. 9440 */ 9441 if (!prog->tstamp_type_access) { 9442 __u8 tmp_reg = BPF_REG_AX; 9443 9444 *insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg, SKB_BF_MONO_TC_OFFSET); 9445 /* Writing __sk_buff->tstamp as ingress, goto <clear> */ 9446 *insn++ = BPF_JMP32_IMM(BPF_JSET, tmp_reg, TC_AT_INGRESS_MASK, 1); 9447 /* goto <store> */ 9448 *insn++ = BPF_JMP_A(2); 9449 /* <clear>: mono_delivery_time */ 9450 *insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg, ~SKB_MONO_DELIVERY_TIME_MASK); 9451 *insn++ = BPF_STX_MEM(BPF_B, skb_reg, tmp_reg, SKB_BF_MONO_TC_OFFSET); 9452 } 9453 #endif 9454 9455 /* <store>: skb->tstamp = tstamp */ 9456 *insn++ = BPF_RAW_INSN(BPF_CLASS(si->code) | BPF_DW | BPF_MEM, 9457 skb_reg, value_reg, offsetof(struct sk_buff, tstamp), si->imm); 9458 return insn; 9459 } 9460 9461 #define BPF_EMIT_STORE(size, si, off) \ 9462 BPF_RAW_INSN(BPF_CLASS((si)->code) | (size) | BPF_MEM, \ 9463 (si)->dst_reg, (si)->src_reg, (off), (si)->imm) 9464 9465 static u32 bpf_convert_ctx_access(enum bpf_access_type type, 9466 const struct bpf_insn *si, 9467 struct bpf_insn *insn_buf, 9468 struct bpf_prog *prog, u32 *target_size) 9469 { 9470 struct bpf_insn *insn = insn_buf; 9471 int off; 9472 9473 switch (si->off) { 9474 case offsetof(struct __sk_buff, len): 9475 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9476 bpf_target_off(struct sk_buff, len, 4, 9477 target_size)); 9478 break; 9479 9480 case offsetof(struct __sk_buff, protocol): 9481 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9482 bpf_target_off(struct sk_buff, protocol, 2, 9483 target_size)); 9484 break; 9485 9486 case offsetof(struct __sk_buff, vlan_proto): 9487 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9488 bpf_target_off(struct sk_buff, vlan_proto, 2, 9489 target_size)); 9490 break; 9491 9492 case offsetof(struct __sk_buff, priority): 9493 if (type == BPF_WRITE) 9494 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9495 bpf_target_off(struct sk_buff, priority, 4, 9496 target_size)); 9497 else 9498 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9499 bpf_target_off(struct sk_buff, priority, 4, 9500 target_size)); 9501 break; 9502 9503 case offsetof(struct __sk_buff, ingress_ifindex): 9504 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9505 bpf_target_off(struct sk_buff, skb_iif, 4, 9506 target_size)); 9507 break; 9508 9509 case offsetof(struct __sk_buff, ifindex): 9510 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 9511 si->dst_reg, si->src_reg, 9512 offsetof(struct sk_buff, dev)); 9513 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 9514 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9515 bpf_target_off(struct net_device, ifindex, 4, 9516 target_size)); 9517 break; 9518 9519 case offsetof(struct __sk_buff, hash): 9520 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9521 bpf_target_off(struct sk_buff, hash, 4, 9522 target_size)); 9523 break; 9524 9525 case offsetof(struct __sk_buff, mark): 9526 if (type == BPF_WRITE) 9527 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9528 bpf_target_off(struct sk_buff, mark, 4, 9529 target_size)); 9530 else 9531 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9532 bpf_target_off(struct sk_buff, mark, 4, 9533 target_size)); 9534 break; 9535 9536 case offsetof(struct __sk_buff, pkt_type): 9537 *target_size = 1; 9538 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, 9539 PKT_TYPE_OFFSET); 9540 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX); 9541 #ifdef __BIG_ENDIAN_BITFIELD 9542 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5); 9543 #endif 9544 break; 9545 9546 case offsetof(struct __sk_buff, queue_mapping): 9547 if (type == BPF_WRITE) { 9548 u32 off = bpf_target_off(struct sk_buff, queue_mapping, 2, target_size); 9549 9550 if (BPF_CLASS(si->code) == BPF_ST && si->imm >= NO_QUEUE_MAPPING) { 9551 *insn++ = BPF_JMP_A(0); /* noop */ 9552 break; 9553 } 9554 9555 if (BPF_CLASS(si->code) == BPF_STX) 9556 *insn++ = BPF_JMP_IMM(BPF_JGE, si->src_reg, NO_QUEUE_MAPPING, 1); 9557 *insn++ = BPF_EMIT_STORE(BPF_H, si, off); 9558 } else { 9559 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9560 bpf_target_off(struct sk_buff, 9561 queue_mapping, 9562 2, target_size)); 9563 } 9564 break; 9565 9566 case offsetof(struct __sk_buff, vlan_present): 9567 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9568 bpf_target_off(struct sk_buff, 9569 vlan_all, 4, target_size)); 9570 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 9571 *insn++ = BPF_ALU32_IMM(BPF_MOV, si->dst_reg, 1); 9572 break; 9573 9574 case offsetof(struct __sk_buff, vlan_tci): 9575 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9576 bpf_target_off(struct sk_buff, vlan_tci, 2, 9577 target_size)); 9578 break; 9579 9580 case offsetof(struct __sk_buff, cb[0]) ... 9581 offsetofend(struct __sk_buff, cb[4]) - 1: 9582 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, data) < 20); 9583 BUILD_BUG_ON((offsetof(struct sk_buff, cb) + 9584 offsetof(struct qdisc_skb_cb, data)) % 9585 sizeof(__u64)); 9586 9587 prog->cb_access = 1; 9588 off = si->off; 9589 off -= offsetof(struct __sk_buff, cb[0]); 9590 off += offsetof(struct sk_buff, cb); 9591 off += offsetof(struct qdisc_skb_cb, data); 9592 if (type == BPF_WRITE) 9593 *insn++ = BPF_EMIT_STORE(BPF_SIZE(si->code), si, off); 9594 else 9595 *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg, 9596 si->src_reg, off); 9597 break; 9598 9599 case offsetof(struct __sk_buff, tc_classid): 9600 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, tc_classid) != 2); 9601 9602 off = si->off; 9603 off -= offsetof(struct __sk_buff, tc_classid); 9604 off += offsetof(struct sk_buff, cb); 9605 off += offsetof(struct qdisc_skb_cb, tc_classid); 9606 *target_size = 2; 9607 if (type == BPF_WRITE) 9608 *insn++ = BPF_EMIT_STORE(BPF_H, si, off); 9609 else 9610 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, 9611 si->src_reg, off); 9612 break; 9613 9614 case offsetof(struct __sk_buff, data): 9615 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 9616 si->dst_reg, si->src_reg, 9617 offsetof(struct sk_buff, data)); 9618 break; 9619 9620 case offsetof(struct __sk_buff, data_meta): 9621 off = si->off; 9622 off -= offsetof(struct __sk_buff, data_meta); 9623 off += offsetof(struct sk_buff, cb); 9624 off += offsetof(struct bpf_skb_data_end, data_meta); 9625 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, 9626 si->src_reg, off); 9627 break; 9628 9629 case offsetof(struct __sk_buff, data_end): 9630 off = si->off; 9631 off -= offsetof(struct __sk_buff, data_end); 9632 off += offsetof(struct sk_buff, cb); 9633 off += offsetof(struct bpf_skb_data_end, data_end); 9634 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, 9635 si->src_reg, off); 9636 break; 9637 9638 case offsetof(struct __sk_buff, tc_index): 9639 #ifdef CONFIG_NET_SCHED 9640 if (type == BPF_WRITE) 9641 *insn++ = BPF_EMIT_STORE(BPF_H, si, 9642 bpf_target_off(struct sk_buff, tc_index, 2, 9643 target_size)); 9644 else 9645 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 9646 bpf_target_off(struct sk_buff, tc_index, 2, 9647 target_size)); 9648 #else 9649 *target_size = 2; 9650 if (type == BPF_WRITE) 9651 *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg); 9652 else 9653 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 9654 #endif 9655 break; 9656 9657 case offsetof(struct __sk_buff, napi_id): 9658 #if defined(CONFIG_NET_RX_BUSY_POLL) 9659 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9660 bpf_target_off(struct sk_buff, napi_id, 4, 9661 target_size)); 9662 *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1); 9663 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 9664 #else 9665 *target_size = 4; 9666 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); 9667 #endif 9668 break; 9669 case offsetof(struct __sk_buff, family): 9670 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); 9671 9672 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9673 si->dst_reg, si->src_reg, 9674 offsetof(struct sk_buff, sk)); 9675 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 9676 bpf_target_off(struct sock_common, 9677 skc_family, 9678 2, target_size)); 9679 break; 9680 case offsetof(struct __sk_buff, remote_ip4): 9681 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); 9682 9683 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9684 si->dst_reg, si->src_reg, 9685 offsetof(struct sk_buff, sk)); 9686 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9687 bpf_target_off(struct sock_common, 9688 skc_daddr, 9689 4, target_size)); 9690 break; 9691 case offsetof(struct __sk_buff, local_ip4): 9692 BUILD_BUG_ON(sizeof_field(struct sock_common, 9693 skc_rcv_saddr) != 4); 9694 9695 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9696 si->dst_reg, si->src_reg, 9697 offsetof(struct sk_buff, sk)); 9698 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9699 bpf_target_off(struct sock_common, 9700 skc_rcv_saddr, 9701 4, target_size)); 9702 break; 9703 case offsetof(struct __sk_buff, remote_ip6[0]) ... 9704 offsetof(struct __sk_buff, remote_ip6[3]): 9705 #if IS_ENABLED(CONFIG_IPV6) 9706 BUILD_BUG_ON(sizeof_field(struct sock_common, 9707 skc_v6_daddr.s6_addr32[0]) != 4); 9708 9709 off = si->off; 9710 off -= offsetof(struct __sk_buff, remote_ip6[0]); 9711 9712 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9713 si->dst_reg, si->src_reg, 9714 offsetof(struct sk_buff, sk)); 9715 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9716 offsetof(struct sock_common, 9717 skc_v6_daddr.s6_addr32[0]) + 9718 off); 9719 #else 9720 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9721 #endif 9722 break; 9723 case offsetof(struct __sk_buff, local_ip6[0]) ... 9724 offsetof(struct __sk_buff, local_ip6[3]): 9725 #if IS_ENABLED(CONFIG_IPV6) 9726 BUILD_BUG_ON(sizeof_field(struct sock_common, 9727 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 9728 9729 off = si->off; 9730 off -= offsetof(struct __sk_buff, local_ip6[0]); 9731 9732 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9733 si->dst_reg, si->src_reg, 9734 offsetof(struct sk_buff, sk)); 9735 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 9736 offsetof(struct sock_common, 9737 skc_v6_rcv_saddr.s6_addr32[0]) + 9738 off); 9739 #else 9740 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9741 #endif 9742 break; 9743 9744 case offsetof(struct __sk_buff, remote_port): 9745 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); 9746 9747 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9748 si->dst_reg, si->src_reg, 9749 offsetof(struct sk_buff, sk)); 9750 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 9751 bpf_target_off(struct sock_common, 9752 skc_dport, 9753 2, target_size)); 9754 #ifndef __BIG_ENDIAN_BITFIELD 9755 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 9756 #endif 9757 break; 9758 9759 case offsetof(struct __sk_buff, local_port): 9760 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); 9761 9762 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9763 si->dst_reg, si->src_reg, 9764 offsetof(struct sk_buff, sk)); 9765 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 9766 bpf_target_off(struct sock_common, 9767 skc_num, 2, target_size)); 9768 break; 9769 9770 case offsetof(struct __sk_buff, tstamp): 9771 BUILD_BUG_ON(sizeof_field(struct sk_buff, tstamp) != 8); 9772 9773 if (type == BPF_WRITE) 9774 insn = bpf_convert_tstamp_write(prog, si, insn); 9775 else 9776 insn = bpf_convert_tstamp_read(prog, si, insn); 9777 break; 9778 9779 case offsetof(struct __sk_buff, tstamp_type): 9780 insn = bpf_convert_tstamp_type_read(si, insn); 9781 break; 9782 9783 case offsetof(struct __sk_buff, gso_segs): 9784 insn = bpf_convert_shinfo_access(si->dst_reg, si->src_reg, insn); 9785 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_segs), 9786 si->dst_reg, si->dst_reg, 9787 bpf_target_off(struct skb_shared_info, 9788 gso_segs, 2, 9789 target_size)); 9790 break; 9791 case offsetof(struct __sk_buff, gso_size): 9792 insn = bpf_convert_shinfo_access(si->dst_reg, si->src_reg, insn); 9793 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_size), 9794 si->dst_reg, si->dst_reg, 9795 bpf_target_off(struct skb_shared_info, 9796 gso_size, 2, 9797 target_size)); 9798 break; 9799 case offsetof(struct __sk_buff, wire_len): 9800 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, pkt_len) != 4); 9801 9802 off = si->off; 9803 off -= offsetof(struct __sk_buff, wire_len); 9804 off += offsetof(struct sk_buff, cb); 9805 off += offsetof(struct qdisc_skb_cb, pkt_len); 9806 *target_size = 4; 9807 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, off); 9808 break; 9809 9810 case offsetof(struct __sk_buff, sk): 9811 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), 9812 si->dst_reg, si->src_reg, 9813 offsetof(struct sk_buff, sk)); 9814 break; 9815 case offsetof(struct __sk_buff, hwtstamp): 9816 BUILD_BUG_ON(sizeof_field(struct skb_shared_hwtstamps, hwtstamp) != 8); 9817 BUILD_BUG_ON(offsetof(struct skb_shared_hwtstamps, hwtstamp) != 0); 9818 9819 insn = bpf_convert_shinfo_access(si->dst_reg, si->src_reg, insn); 9820 *insn++ = BPF_LDX_MEM(BPF_DW, 9821 si->dst_reg, si->dst_reg, 9822 bpf_target_off(struct skb_shared_info, 9823 hwtstamps, 8, 9824 target_size)); 9825 break; 9826 } 9827 9828 return insn - insn_buf; 9829 } 9830 9831 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, 9832 const struct bpf_insn *si, 9833 struct bpf_insn *insn_buf, 9834 struct bpf_prog *prog, u32 *target_size) 9835 { 9836 struct bpf_insn *insn = insn_buf; 9837 int off; 9838 9839 switch (si->off) { 9840 case offsetof(struct bpf_sock, bound_dev_if): 9841 BUILD_BUG_ON(sizeof_field(struct sock, sk_bound_dev_if) != 4); 9842 9843 if (type == BPF_WRITE) 9844 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9845 offsetof(struct sock, sk_bound_dev_if)); 9846 else 9847 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9848 offsetof(struct sock, sk_bound_dev_if)); 9849 break; 9850 9851 case offsetof(struct bpf_sock, mark): 9852 BUILD_BUG_ON(sizeof_field(struct sock, sk_mark) != 4); 9853 9854 if (type == BPF_WRITE) 9855 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9856 offsetof(struct sock, sk_mark)); 9857 else 9858 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9859 offsetof(struct sock, sk_mark)); 9860 break; 9861 9862 case offsetof(struct bpf_sock, priority): 9863 BUILD_BUG_ON(sizeof_field(struct sock, sk_priority) != 4); 9864 9865 if (type == BPF_WRITE) 9866 *insn++ = BPF_EMIT_STORE(BPF_W, si, 9867 offsetof(struct sock, sk_priority)); 9868 else 9869 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 9870 offsetof(struct sock, sk_priority)); 9871 break; 9872 9873 case offsetof(struct bpf_sock, family): 9874 *insn++ = BPF_LDX_MEM( 9875 BPF_FIELD_SIZEOF(struct sock_common, skc_family), 9876 si->dst_reg, si->src_reg, 9877 bpf_target_off(struct sock_common, 9878 skc_family, 9879 sizeof_field(struct sock_common, 9880 skc_family), 9881 target_size)); 9882 break; 9883 9884 case offsetof(struct bpf_sock, type): 9885 *insn++ = BPF_LDX_MEM( 9886 BPF_FIELD_SIZEOF(struct sock, sk_type), 9887 si->dst_reg, si->src_reg, 9888 bpf_target_off(struct sock, sk_type, 9889 sizeof_field(struct sock, sk_type), 9890 target_size)); 9891 break; 9892 9893 case offsetof(struct bpf_sock, protocol): 9894 *insn++ = BPF_LDX_MEM( 9895 BPF_FIELD_SIZEOF(struct sock, sk_protocol), 9896 si->dst_reg, si->src_reg, 9897 bpf_target_off(struct sock, sk_protocol, 9898 sizeof_field(struct sock, sk_protocol), 9899 target_size)); 9900 break; 9901 9902 case offsetof(struct bpf_sock, src_ip4): 9903 *insn++ = BPF_LDX_MEM( 9904 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 9905 bpf_target_off(struct sock_common, skc_rcv_saddr, 9906 sizeof_field(struct sock_common, 9907 skc_rcv_saddr), 9908 target_size)); 9909 break; 9910 9911 case offsetof(struct bpf_sock, dst_ip4): 9912 *insn++ = BPF_LDX_MEM( 9913 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 9914 bpf_target_off(struct sock_common, skc_daddr, 9915 sizeof_field(struct sock_common, 9916 skc_daddr), 9917 target_size)); 9918 break; 9919 9920 case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): 9921 #if IS_ENABLED(CONFIG_IPV6) 9922 off = si->off; 9923 off -= offsetof(struct bpf_sock, src_ip6[0]); 9924 *insn++ = BPF_LDX_MEM( 9925 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 9926 bpf_target_off( 9927 struct sock_common, 9928 skc_v6_rcv_saddr.s6_addr32[0], 9929 sizeof_field(struct sock_common, 9930 skc_v6_rcv_saddr.s6_addr32[0]), 9931 target_size) + off); 9932 #else 9933 (void)off; 9934 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9935 #endif 9936 break; 9937 9938 case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): 9939 #if IS_ENABLED(CONFIG_IPV6) 9940 off = si->off; 9941 off -= offsetof(struct bpf_sock, dst_ip6[0]); 9942 *insn++ = BPF_LDX_MEM( 9943 BPF_SIZE(si->code), si->dst_reg, si->src_reg, 9944 bpf_target_off(struct sock_common, 9945 skc_v6_daddr.s6_addr32[0], 9946 sizeof_field(struct sock_common, 9947 skc_v6_daddr.s6_addr32[0]), 9948 target_size) + off); 9949 #else 9950 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 9951 *target_size = 4; 9952 #endif 9953 break; 9954 9955 case offsetof(struct bpf_sock, src_port): 9956 *insn++ = BPF_LDX_MEM( 9957 BPF_FIELD_SIZEOF(struct sock_common, skc_num), 9958 si->dst_reg, si->src_reg, 9959 bpf_target_off(struct sock_common, skc_num, 9960 sizeof_field(struct sock_common, 9961 skc_num), 9962 target_size)); 9963 break; 9964 9965 case offsetof(struct bpf_sock, dst_port): 9966 *insn++ = BPF_LDX_MEM( 9967 BPF_FIELD_SIZEOF(struct sock_common, skc_dport), 9968 si->dst_reg, si->src_reg, 9969 bpf_target_off(struct sock_common, skc_dport, 9970 sizeof_field(struct sock_common, 9971 skc_dport), 9972 target_size)); 9973 break; 9974 9975 case offsetof(struct bpf_sock, state): 9976 *insn++ = BPF_LDX_MEM( 9977 BPF_FIELD_SIZEOF(struct sock_common, skc_state), 9978 si->dst_reg, si->src_reg, 9979 bpf_target_off(struct sock_common, skc_state, 9980 sizeof_field(struct sock_common, 9981 skc_state), 9982 target_size)); 9983 break; 9984 case offsetof(struct bpf_sock, rx_queue_mapping): 9985 #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING 9986 *insn++ = BPF_LDX_MEM( 9987 BPF_FIELD_SIZEOF(struct sock, sk_rx_queue_mapping), 9988 si->dst_reg, si->src_reg, 9989 bpf_target_off(struct sock, sk_rx_queue_mapping, 9990 sizeof_field(struct sock, 9991 sk_rx_queue_mapping), 9992 target_size)); 9993 *insn++ = BPF_JMP_IMM(BPF_JNE, si->dst_reg, NO_QUEUE_MAPPING, 9994 1); 9995 *insn++ = BPF_MOV64_IMM(si->dst_reg, -1); 9996 #else 9997 *insn++ = BPF_MOV64_IMM(si->dst_reg, -1); 9998 *target_size = 2; 9999 #endif 10000 break; 10001 } 10002 10003 return insn - insn_buf; 10004 } 10005 10006 static u32 tc_cls_act_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, u32 *target_size) 10010 { 10011 struct bpf_insn *insn = insn_buf; 10012 10013 switch (si->off) { 10014 case offsetof(struct __sk_buff, ifindex): 10015 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), 10016 si->dst_reg, si->src_reg, 10017 offsetof(struct sk_buff, dev)); 10018 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10019 bpf_target_off(struct net_device, ifindex, 4, 10020 target_size)); 10021 break; 10022 default: 10023 return bpf_convert_ctx_access(type, si, insn_buf, prog, 10024 target_size); 10025 } 10026 10027 return insn - insn_buf; 10028 } 10029 10030 static u32 xdp_convert_ctx_access(enum bpf_access_type type, 10031 const struct bpf_insn *si, 10032 struct bpf_insn *insn_buf, 10033 struct bpf_prog *prog, u32 *target_size) 10034 { 10035 struct bpf_insn *insn = insn_buf; 10036 10037 switch (si->off) { 10038 case offsetof(struct xdp_md, data): 10039 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data), 10040 si->dst_reg, si->src_reg, 10041 offsetof(struct xdp_buff, data)); 10042 break; 10043 case offsetof(struct xdp_md, data_meta): 10044 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta), 10045 si->dst_reg, si->src_reg, 10046 offsetof(struct xdp_buff, data_meta)); 10047 break; 10048 case offsetof(struct xdp_md, data_end): 10049 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end), 10050 si->dst_reg, si->src_reg, 10051 offsetof(struct xdp_buff, data_end)); 10052 break; 10053 case offsetof(struct xdp_md, ingress_ifindex): 10054 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), 10055 si->dst_reg, si->src_reg, 10056 offsetof(struct xdp_buff, rxq)); 10057 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev), 10058 si->dst_reg, si->dst_reg, 10059 offsetof(struct xdp_rxq_info, dev)); 10060 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10061 offsetof(struct net_device, ifindex)); 10062 break; 10063 case offsetof(struct xdp_md, rx_queue_index): 10064 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), 10065 si->dst_reg, si->src_reg, 10066 offsetof(struct xdp_buff, rxq)); 10067 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10068 offsetof(struct xdp_rxq_info, 10069 queue_index)); 10070 break; 10071 case offsetof(struct xdp_md, egress_ifindex): 10072 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, txq), 10073 si->dst_reg, si->src_reg, 10074 offsetof(struct xdp_buff, txq)); 10075 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_txq_info, dev), 10076 si->dst_reg, si->dst_reg, 10077 offsetof(struct xdp_txq_info, dev)); 10078 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10079 offsetof(struct net_device, ifindex)); 10080 break; 10081 } 10082 10083 return insn - insn_buf; 10084 } 10085 10086 /* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of 10087 * context Structure, F is Field in context structure that contains a pointer 10088 * to Nested Structure of type NS that has the field NF. 10089 * 10090 * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make 10091 * sure that SIZE is not greater than actual size of S.F.NF. 10092 * 10093 * If offset OFF is provided, the load happens from that offset relative to 10094 * offset of NF. 10095 */ 10096 #define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF) \ 10097 do { \ 10098 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg, \ 10099 si->src_reg, offsetof(S, F)); \ 10100 *insn++ = BPF_LDX_MEM( \ 10101 SIZE, si->dst_reg, si->dst_reg, \ 10102 bpf_target_off(NS, NF, sizeof_field(NS, NF), \ 10103 target_size) \ 10104 + OFF); \ 10105 } while (0) 10106 10107 #define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF) \ 10108 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, \ 10109 BPF_FIELD_SIZEOF(NS, NF), 0) 10110 10111 /* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to 10112 * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation. 10113 * 10114 * In addition it uses Temporary Field TF (member of struct S) as the 3rd 10115 * "register" since two registers available in convert_ctx_access are not 10116 * enough: we can't override neither SRC, since it contains value to store, nor 10117 * DST since it contains pointer to context that may be used by later 10118 * instructions. But we need a temporary place to save pointer to nested 10119 * structure whose field we want to store to. 10120 */ 10121 #define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, OFF, TF) \ 10122 do { \ 10123 int tmp_reg = BPF_REG_9; \ 10124 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ 10125 --tmp_reg; \ 10126 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ 10127 --tmp_reg; \ 10128 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg, \ 10129 offsetof(S, TF)); \ 10130 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg, \ 10131 si->dst_reg, offsetof(S, F)); \ 10132 *insn++ = BPF_RAW_INSN(SIZE | BPF_MEM | BPF_CLASS(si->code), \ 10133 tmp_reg, si->src_reg, \ 10134 bpf_target_off(NS, NF, sizeof_field(NS, NF), \ 10135 target_size) \ 10136 + OFF, \ 10137 si->imm); \ 10138 *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg, \ 10139 offsetof(S, TF)); \ 10140 } while (0) 10141 10142 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \ 10143 TF) \ 10144 do { \ 10145 if (type == BPF_WRITE) { \ 10146 SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, \ 10147 OFF, TF); \ 10148 } else { \ 10149 SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( \ 10150 S, NS, F, NF, SIZE, OFF); \ 10151 } \ 10152 } while (0) 10153 10154 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF) \ 10155 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( \ 10156 S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF) 10157 10158 static u32 sock_addr_convert_ctx_access(enum bpf_access_type type, 10159 const struct bpf_insn *si, 10160 struct bpf_insn *insn_buf, 10161 struct bpf_prog *prog, u32 *target_size) 10162 { 10163 int off, port_size = sizeof_field(struct sockaddr_in6, sin6_port); 10164 struct bpf_insn *insn = insn_buf; 10165 10166 switch (si->off) { 10167 case offsetof(struct bpf_sock_addr, user_family): 10168 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 10169 struct sockaddr, uaddr, sa_family); 10170 break; 10171 10172 case offsetof(struct bpf_sock_addr, user_ip4): 10173 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10174 struct bpf_sock_addr_kern, struct sockaddr_in, uaddr, 10175 sin_addr, BPF_SIZE(si->code), 0, tmp_reg); 10176 break; 10177 10178 case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): 10179 off = si->off; 10180 off -= offsetof(struct bpf_sock_addr, user_ip6[0]); 10181 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10182 struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr, 10183 sin6_addr.s6_addr32[0], BPF_SIZE(si->code), off, 10184 tmp_reg); 10185 break; 10186 10187 case offsetof(struct bpf_sock_addr, user_port): 10188 /* To get port we need to know sa_family first and then treat 10189 * sockaddr as either sockaddr_in or sockaddr_in6. 10190 * Though we can simplify since port field has same offset and 10191 * size in both structures. 10192 * Here we check this invariant and use just one of the 10193 * structures if it's true. 10194 */ 10195 BUILD_BUG_ON(offsetof(struct sockaddr_in, sin_port) != 10196 offsetof(struct sockaddr_in6, sin6_port)); 10197 BUILD_BUG_ON(sizeof_field(struct sockaddr_in, sin_port) != 10198 sizeof_field(struct sockaddr_in6, sin6_port)); 10199 /* Account for sin6_port being smaller than user_port. */ 10200 port_size = min(port_size, BPF_LDST_BYTES(si)); 10201 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10202 struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr, 10203 sin6_port, bytes_to_bpf_size(port_size), 0, tmp_reg); 10204 break; 10205 10206 case offsetof(struct bpf_sock_addr, family): 10207 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 10208 struct sock, sk, sk_family); 10209 break; 10210 10211 case offsetof(struct bpf_sock_addr, type): 10212 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 10213 struct sock, sk, sk_type); 10214 break; 10215 10216 case offsetof(struct bpf_sock_addr, protocol): 10217 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, 10218 struct sock, sk, sk_protocol); 10219 break; 10220 10221 case offsetof(struct bpf_sock_addr, msg_src_ip4): 10222 /* Treat t_ctx as struct in_addr for msg_src_ip4. */ 10223 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10224 struct bpf_sock_addr_kern, struct in_addr, t_ctx, 10225 s_addr, BPF_SIZE(si->code), 0, tmp_reg); 10226 break; 10227 10228 case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], 10229 msg_src_ip6[3]): 10230 off = si->off; 10231 off -= offsetof(struct bpf_sock_addr, msg_src_ip6[0]); 10232 /* Treat t_ctx as struct in6_addr for msg_src_ip6. */ 10233 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( 10234 struct bpf_sock_addr_kern, struct in6_addr, t_ctx, 10235 s6_addr32[0], BPF_SIZE(si->code), off, tmp_reg); 10236 break; 10237 case offsetof(struct bpf_sock_addr, sk): 10238 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_addr_kern, sk), 10239 si->dst_reg, si->src_reg, 10240 offsetof(struct bpf_sock_addr_kern, sk)); 10241 break; 10242 } 10243 10244 return insn - insn_buf; 10245 } 10246 10247 static u32 sock_ops_convert_ctx_access(enum bpf_access_type type, 10248 const struct bpf_insn *si, 10249 struct bpf_insn *insn_buf, 10250 struct bpf_prog *prog, 10251 u32 *target_size) 10252 { 10253 struct bpf_insn *insn = insn_buf; 10254 int off; 10255 10256 /* Helper macro for adding read access to tcp_sock or sock fields. */ 10257 #define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ 10258 do { \ 10259 int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 2; \ 10260 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \ 10261 sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \ 10262 if (si->dst_reg == reg || si->src_reg == reg) \ 10263 reg--; \ 10264 if (si->dst_reg == reg || si->src_reg == reg) \ 10265 reg--; \ 10266 if (si->dst_reg == si->src_reg) { \ 10267 *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, \ 10268 offsetof(struct bpf_sock_ops_kern, \ 10269 temp)); \ 10270 fullsock_reg = reg; \ 10271 jmp += 2; \ 10272 } \ 10273 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10274 struct bpf_sock_ops_kern, \ 10275 is_fullsock), \ 10276 fullsock_reg, si->src_reg, \ 10277 offsetof(struct bpf_sock_ops_kern, \ 10278 is_fullsock)); \ 10279 *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp); \ 10280 if (si->dst_reg == si->src_reg) \ 10281 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 10282 offsetof(struct bpf_sock_ops_kern, \ 10283 temp)); \ 10284 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10285 struct bpf_sock_ops_kern, sk),\ 10286 si->dst_reg, si->src_reg, \ 10287 offsetof(struct bpf_sock_ops_kern, sk));\ 10288 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ, \ 10289 OBJ_FIELD), \ 10290 si->dst_reg, si->dst_reg, \ 10291 offsetof(OBJ, OBJ_FIELD)); \ 10292 if (si->dst_reg == si->src_reg) { \ 10293 *insn++ = BPF_JMP_A(1); \ 10294 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 10295 offsetof(struct bpf_sock_ops_kern, \ 10296 temp)); \ 10297 } \ 10298 } while (0) 10299 10300 #define SOCK_OPS_GET_SK() \ 10301 do { \ 10302 int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 1; \ 10303 if (si->dst_reg == reg || si->src_reg == reg) \ 10304 reg--; \ 10305 if (si->dst_reg == reg || si->src_reg == reg) \ 10306 reg--; \ 10307 if (si->dst_reg == si->src_reg) { \ 10308 *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, \ 10309 offsetof(struct bpf_sock_ops_kern, \ 10310 temp)); \ 10311 fullsock_reg = reg; \ 10312 jmp += 2; \ 10313 } \ 10314 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10315 struct bpf_sock_ops_kern, \ 10316 is_fullsock), \ 10317 fullsock_reg, si->src_reg, \ 10318 offsetof(struct bpf_sock_ops_kern, \ 10319 is_fullsock)); \ 10320 *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp); \ 10321 if (si->dst_reg == si->src_reg) \ 10322 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 10323 offsetof(struct bpf_sock_ops_kern, \ 10324 temp)); \ 10325 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10326 struct bpf_sock_ops_kern, sk),\ 10327 si->dst_reg, si->src_reg, \ 10328 offsetof(struct bpf_sock_ops_kern, sk));\ 10329 if (si->dst_reg == si->src_reg) { \ 10330 *insn++ = BPF_JMP_A(1); \ 10331 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ 10332 offsetof(struct bpf_sock_ops_kern, \ 10333 temp)); \ 10334 } \ 10335 } while (0) 10336 10337 #define SOCK_OPS_GET_TCP_SOCK_FIELD(FIELD) \ 10338 SOCK_OPS_GET_FIELD(FIELD, FIELD, struct tcp_sock) 10339 10340 /* Helper macro for adding write access to tcp_sock or sock fields. 10341 * The macro is called with two registers, dst_reg which contains a pointer 10342 * to ctx (context) and src_reg which contains the value that should be 10343 * stored. However, we need an additional register since we cannot overwrite 10344 * dst_reg because it may be used later in the program. 10345 * Instead we "borrow" one of the other register. We first save its value 10346 * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore 10347 * it at the end of the macro. 10348 */ 10349 #define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ 10350 do { \ 10351 int reg = BPF_REG_9; \ 10352 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \ 10353 sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \ 10354 if (si->dst_reg == reg || si->src_reg == reg) \ 10355 reg--; \ 10356 if (si->dst_reg == reg || si->src_reg == reg) \ 10357 reg--; \ 10358 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg, \ 10359 offsetof(struct bpf_sock_ops_kern, \ 10360 temp)); \ 10361 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10362 struct bpf_sock_ops_kern, \ 10363 is_fullsock), \ 10364 reg, si->dst_reg, \ 10365 offsetof(struct bpf_sock_ops_kern, \ 10366 is_fullsock)); \ 10367 *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2); \ 10368 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ 10369 struct bpf_sock_ops_kern, sk),\ 10370 reg, si->dst_reg, \ 10371 offsetof(struct bpf_sock_ops_kern, sk));\ 10372 *insn++ = BPF_RAW_INSN(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD) | \ 10373 BPF_MEM | BPF_CLASS(si->code), \ 10374 reg, si->src_reg, \ 10375 offsetof(OBJ, OBJ_FIELD), \ 10376 si->imm); \ 10377 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg, \ 10378 offsetof(struct bpf_sock_ops_kern, \ 10379 temp)); \ 10380 } while (0) 10381 10382 #define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE) \ 10383 do { \ 10384 if (TYPE == BPF_WRITE) \ 10385 SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ 10386 else \ 10387 SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ 10388 } while (0) 10389 10390 switch (si->off) { 10391 case offsetof(struct bpf_sock_ops, op): 10392 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10393 op), 10394 si->dst_reg, si->src_reg, 10395 offsetof(struct bpf_sock_ops_kern, op)); 10396 break; 10397 10398 case offsetof(struct bpf_sock_ops, replylong[0]) ... 10399 offsetof(struct bpf_sock_ops, replylong[3]): 10400 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, reply) != 10401 sizeof_field(struct bpf_sock_ops_kern, reply)); 10402 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, replylong) != 10403 sizeof_field(struct bpf_sock_ops_kern, replylong)); 10404 off = si->off; 10405 off -= offsetof(struct bpf_sock_ops, replylong[0]); 10406 off += offsetof(struct bpf_sock_ops_kern, replylong[0]); 10407 if (type == BPF_WRITE) 10408 *insn++ = BPF_EMIT_STORE(BPF_W, si, off); 10409 else 10410 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 10411 off); 10412 break; 10413 10414 case offsetof(struct bpf_sock_ops, family): 10415 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); 10416 10417 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10418 struct bpf_sock_ops_kern, sk), 10419 si->dst_reg, si->src_reg, 10420 offsetof(struct bpf_sock_ops_kern, sk)); 10421 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10422 offsetof(struct sock_common, skc_family)); 10423 break; 10424 10425 case offsetof(struct bpf_sock_ops, remote_ip4): 10426 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); 10427 10428 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10429 struct bpf_sock_ops_kern, sk), 10430 si->dst_reg, si->src_reg, 10431 offsetof(struct bpf_sock_ops_kern, sk)); 10432 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10433 offsetof(struct sock_common, skc_daddr)); 10434 break; 10435 10436 case offsetof(struct bpf_sock_ops, local_ip4): 10437 BUILD_BUG_ON(sizeof_field(struct sock_common, 10438 skc_rcv_saddr) != 4); 10439 10440 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10441 struct bpf_sock_ops_kern, sk), 10442 si->dst_reg, si->src_reg, 10443 offsetof(struct bpf_sock_ops_kern, sk)); 10444 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10445 offsetof(struct sock_common, 10446 skc_rcv_saddr)); 10447 break; 10448 10449 case offsetof(struct bpf_sock_ops, remote_ip6[0]) ... 10450 offsetof(struct bpf_sock_ops, remote_ip6[3]): 10451 #if IS_ENABLED(CONFIG_IPV6) 10452 BUILD_BUG_ON(sizeof_field(struct sock_common, 10453 skc_v6_daddr.s6_addr32[0]) != 4); 10454 10455 off = si->off; 10456 off -= offsetof(struct bpf_sock_ops, remote_ip6[0]); 10457 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10458 struct bpf_sock_ops_kern, sk), 10459 si->dst_reg, si->src_reg, 10460 offsetof(struct bpf_sock_ops_kern, sk)); 10461 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10462 offsetof(struct sock_common, 10463 skc_v6_daddr.s6_addr32[0]) + 10464 off); 10465 #else 10466 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 10467 #endif 10468 break; 10469 10470 case offsetof(struct bpf_sock_ops, local_ip6[0]) ... 10471 offsetof(struct bpf_sock_ops, local_ip6[3]): 10472 #if IS_ENABLED(CONFIG_IPV6) 10473 BUILD_BUG_ON(sizeof_field(struct sock_common, 10474 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 10475 10476 off = si->off; 10477 off -= offsetof(struct bpf_sock_ops, local_ip6[0]); 10478 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10479 struct bpf_sock_ops_kern, sk), 10480 si->dst_reg, si->src_reg, 10481 offsetof(struct bpf_sock_ops_kern, sk)); 10482 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10483 offsetof(struct sock_common, 10484 skc_v6_rcv_saddr.s6_addr32[0]) + 10485 off); 10486 #else 10487 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 10488 #endif 10489 break; 10490 10491 case offsetof(struct bpf_sock_ops, remote_port): 10492 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); 10493 10494 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10495 struct bpf_sock_ops_kern, sk), 10496 si->dst_reg, si->src_reg, 10497 offsetof(struct bpf_sock_ops_kern, sk)); 10498 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10499 offsetof(struct sock_common, skc_dport)); 10500 #ifndef __BIG_ENDIAN_BITFIELD 10501 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 10502 #endif 10503 break; 10504 10505 case offsetof(struct bpf_sock_ops, local_port): 10506 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); 10507 10508 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10509 struct bpf_sock_ops_kern, sk), 10510 si->dst_reg, si->src_reg, 10511 offsetof(struct bpf_sock_ops_kern, sk)); 10512 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10513 offsetof(struct sock_common, skc_num)); 10514 break; 10515 10516 case offsetof(struct bpf_sock_ops, is_fullsock): 10517 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10518 struct bpf_sock_ops_kern, 10519 is_fullsock), 10520 si->dst_reg, si->src_reg, 10521 offsetof(struct bpf_sock_ops_kern, 10522 is_fullsock)); 10523 break; 10524 10525 case offsetof(struct bpf_sock_ops, state): 10526 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_state) != 1); 10527 10528 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10529 struct bpf_sock_ops_kern, sk), 10530 si->dst_reg, si->src_reg, 10531 offsetof(struct bpf_sock_ops_kern, sk)); 10532 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg, 10533 offsetof(struct sock_common, skc_state)); 10534 break; 10535 10536 case offsetof(struct bpf_sock_ops, rtt_min): 10537 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) != 10538 sizeof(struct minmax)); 10539 BUILD_BUG_ON(sizeof(struct minmax) < 10540 sizeof(struct minmax_sample)); 10541 10542 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10543 struct bpf_sock_ops_kern, sk), 10544 si->dst_reg, si->src_reg, 10545 offsetof(struct bpf_sock_ops_kern, sk)); 10546 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10547 offsetof(struct tcp_sock, rtt_min) + 10548 sizeof_field(struct minmax_sample, t)); 10549 break; 10550 10551 case offsetof(struct bpf_sock_ops, bpf_sock_ops_cb_flags): 10552 SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags, 10553 struct tcp_sock); 10554 break; 10555 10556 case offsetof(struct bpf_sock_ops, sk_txhash): 10557 SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash, 10558 struct sock, type); 10559 break; 10560 case offsetof(struct bpf_sock_ops, snd_cwnd): 10561 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_cwnd); 10562 break; 10563 case offsetof(struct bpf_sock_ops, srtt_us): 10564 SOCK_OPS_GET_TCP_SOCK_FIELD(srtt_us); 10565 break; 10566 case offsetof(struct bpf_sock_ops, snd_ssthresh): 10567 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_ssthresh); 10568 break; 10569 case offsetof(struct bpf_sock_ops, rcv_nxt): 10570 SOCK_OPS_GET_TCP_SOCK_FIELD(rcv_nxt); 10571 break; 10572 case offsetof(struct bpf_sock_ops, snd_nxt): 10573 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_nxt); 10574 break; 10575 case offsetof(struct bpf_sock_ops, snd_una): 10576 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_una); 10577 break; 10578 case offsetof(struct bpf_sock_ops, mss_cache): 10579 SOCK_OPS_GET_TCP_SOCK_FIELD(mss_cache); 10580 break; 10581 case offsetof(struct bpf_sock_ops, ecn_flags): 10582 SOCK_OPS_GET_TCP_SOCK_FIELD(ecn_flags); 10583 break; 10584 case offsetof(struct bpf_sock_ops, rate_delivered): 10585 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_delivered); 10586 break; 10587 case offsetof(struct bpf_sock_ops, rate_interval_us): 10588 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_interval_us); 10589 break; 10590 case offsetof(struct bpf_sock_ops, packets_out): 10591 SOCK_OPS_GET_TCP_SOCK_FIELD(packets_out); 10592 break; 10593 case offsetof(struct bpf_sock_ops, retrans_out): 10594 SOCK_OPS_GET_TCP_SOCK_FIELD(retrans_out); 10595 break; 10596 case offsetof(struct bpf_sock_ops, total_retrans): 10597 SOCK_OPS_GET_TCP_SOCK_FIELD(total_retrans); 10598 break; 10599 case offsetof(struct bpf_sock_ops, segs_in): 10600 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_in); 10601 break; 10602 case offsetof(struct bpf_sock_ops, data_segs_in): 10603 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_in); 10604 break; 10605 case offsetof(struct bpf_sock_ops, segs_out): 10606 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_out); 10607 break; 10608 case offsetof(struct bpf_sock_ops, data_segs_out): 10609 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_out); 10610 break; 10611 case offsetof(struct bpf_sock_ops, lost_out): 10612 SOCK_OPS_GET_TCP_SOCK_FIELD(lost_out); 10613 break; 10614 case offsetof(struct bpf_sock_ops, sacked_out): 10615 SOCK_OPS_GET_TCP_SOCK_FIELD(sacked_out); 10616 break; 10617 case offsetof(struct bpf_sock_ops, bytes_received): 10618 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_received); 10619 break; 10620 case offsetof(struct bpf_sock_ops, bytes_acked): 10621 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_acked); 10622 break; 10623 case offsetof(struct bpf_sock_ops, sk): 10624 SOCK_OPS_GET_SK(); 10625 break; 10626 case offsetof(struct bpf_sock_ops, skb_data_end): 10627 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10628 skb_data_end), 10629 si->dst_reg, si->src_reg, 10630 offsetof(struct bpf_sock_ops_kern, 10631 skb_data_end)); 10632 break; 10633 case offsetof(struct bpf_sock_ops, skb_data): 10634 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10635 skb), 10636 si->dst_reg, si->src_reg, 10637 offsetof(struct bpf_sock_ops_kern, 10638 skb)); 10639 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 10640 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 10641 si->dst_reg, si->dst_reg, 10642 offsetof(struct sk_buff, data)); 10643 break; 10644 case offsetof(struct bpf_sock_ops, skb_len): 10645 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10646 skb), 10647 si->dst_reg, si->src_reg, 10648 offsetof(struct bpf_sock_ops_kern, 10649 skb)); 10650 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 10651 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, len), 10652 si->dst_reg, si->dst_reg, 10653 offsetof(struct sk_buff, len)); 10654 break; 10655 case offsetof(struct bpf_sock_ops, skb_tcp_flags): 10656 off = offsetof(struct sk_buff, cb); 10657 off += offsetof(struct tcp_skb_cb, tcp_flags); 10658 *target_size = sizeof_field(struct tcp_skb_cb, tcp_flags); 10659 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10660 skb), 10661 si->dst_reg, si->src_reg, 10662 offsetof(struct bpf_sock_ops_kern, 10663 skb)); 10664 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 10665 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_skb_cb, 10666 tcp_flags), 10667 si->dst_reg, si->dst_reg, off); 10668 break; 10669 case offsetof(struct bpf_sock_ops, skb_hwtstamp): { 10670 struct bpf_insn *jmp_on_null_skb; 10671 10672 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern, 10673 skb), 10674 si->dst_reg, si->src_reg, 10675 offsetof(struct bpf_sock_ops_kern, 10676 skb)); 10677 /* Reserve one insn to test skb == NULL */ 10678 jmp_on_null_skb = insn++; 10679 insn = bpf_convert_shinfo_access(si->dst_reg, si->dst_reg, insn); 10680 *insn++ = BPF_LDX_MEM(BPF_DW, si->dst_reg, si->dst_reg, 10681 bpf_target_off(struct skb_shared_info, 10682 hwtstamps, 8, 10683 target_size)); 10684 *jmp_on_null_skb = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 10685 insn - jmp_on_null_skb - 1); 10686 break; 10687 } 10688 } 10689 return insn - insn_buf; 10690 } 10691 10692 /* data_end = skb->data + skb_headlen() */ 10693 static struct bpf_insn *bpf_convert_data_end_access(const struct bpf_insn *si, 10694 struct bpf_insn *insn) 10695 { 10696 int reg; 10697 int temp_reg_off = offsetof(struct sk_buff, cb) + 10698 offsetof(struct sk_skb_cb, temp_reg); 10699 10700 if (si->src_reg == si->dst_reg) { 10701 /* We need an extra register, choose and save a register. */ 10702 reg = BPF_REG_9; 10703 if (si->src_reg == reg || si->dst_reg == reg) 10704 reg--; 10705 if (si->src_reg == reg || si->dst_reg == reg) 10706 reg--; 10707 *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, temp_reg_off); 10708 } else { 10709 reg = si->dst_reg; 10710 } 10711 10712 /* reg = skb->data */ 10713 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), 10714 reg, si->src_reg, 10715 offsetof(struct sk_buff, data)); 10716 /* AX = skb->len */ 10717 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, len), 10718 BPF_REG_AX, si->src_reg, 10719 offsetof(struct sk_buff, len)); 10720 /* reg = skb->data + skb->len */ 10721 *insn++ = BPF_ALU64_REG(BPF_ADD, reg, BPF_REG_AX); 10722 /* AX = skb->data_len */ 10723 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data_len), 10724 BPF_REG_AX, si->src_reg, 10725 offsetof(struct sk_buff, data_len)); 10726 10727 /* reg = skb->data + skb->len - skb->data_len */ 10728 *insn++ = BPF_ALU64_REG(BPF_SUB, reg, BPF_REG_AX); 10729 10730 if (si->src_reg == si->dst_reg) { 10731 /* Restore the saved register */ 10732 *insn++ = BPF_MOV64_REG(BPF_REG_AX, si->src_reg); 10733 *insn++ = BPF_MOV64_REG(si->dst_reg, reg); 10734 *insn++ = BPF_LDX_MEM(BPF_DW, reg, BPF_REG_AX, temp_reg_off); 10735 } 10736 10737 return insn; 10738 } 10739 10740 static u32 sk_skb_convert_ctx_access(enum bpf_access_type type, 10741 const struct bpf_insn *si, 10742 struct bpf_insn *insn_buf, 10743 struct bpf_prog *prog, u32 *target_size) 10744 { 10745 struct bpf_insn *insn = insn_buf; 10746 int off; 10747 10748 switch (si->off) { 10749 case offsetof(struct __sk_buff, data_end): 10750 insn = bpf_convert_data_end_access(si, insn); 10751 break; 10752 case offsetof(struct __sk_buff, cb[0]) ... 10753 offsetofend(struct __sk_buff, cb[4]) - 1: 10754 BUILD_BUG_ON(sizeof_field(struct sk_skb_cb, data) < 20); 10755 BUILD_BUG_ON((offsetof(struct sk_buff, cb) + 10756 offsetof(struct sk_skb_cb, data)) % 10757 sizeof(__u64)); 10758 10759 prog->cb_access = 1; 10760 off = si->off; 10761 off -= offsetof(struct __sk_buff, cb[0]); 10762 off += offsetof(struct sk_buff, cb); 10763 off += offsetof(struct sk_skb_cb, data); 10764 if (type == BPF_WRITE) 10765 *insn++ = BPF_EMIT_STORE(BPF_SIZE(si->code), si, off); 10766 else 10767 *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg, 10768 si->src_reg, off); 10769 break; 10770 10771 10772 default: 10773 return bpf_convert_ctx_access(type, si, insn_buf, prog, 10774 target_size); 10775 } 10776 10777 return insn - insn_buf; 10778 } 10779 10780 static u32 sk_msg_convert_ctx_access(enum bpf_access_type type, 10781 const struct bpf_insn *si, 10782 struct bpf_insn *insn_buf, 10783 struct bpf_prog *prog, u32 *target_size) 10784 { 10785 struct bpf_insn *insn = insn_buf; 10786 #if IS_ENABLED(CONFIG_IPV6) 10787 int off; 10788 #endif 10789 10790 /* convert ctx uses the fact sg element is first in struct */ 10791 BUILD_BUG_ON(offsetof(struct sk_msg, sg) != 0); 10792 10793 switch (si->off) { 10794 case offsetof(struct sk_msg_md, data): 10795 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data), 10796 si->dst_reg, si->src_reg, 10797 offsetof(struct sk_msg, data)); 10798 break; 10799 case offsetof(struct sk_msg_md, data_end): 10800 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data_end), 10801 si->dst_reg, si->src_reg, 10802 offsetof(struct sk_msg, data_end)); 10803 break; 10804 case offsetof(struct sk_msg_md, family): 10805 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); 10806 10807 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10808 struct sk_msg, sk), 10809 si->dst_reg, si->src_reg, 10810 offsetof(struct sk_msg, sk)); 10811 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10812 offsetof(struct sock_common, skc_family)); 10813 break; 10814 10815 case offsetof(struct sk_msg_md, remote_ip4): 10816 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); 10817 10818 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10819 struct sk_msg, sk), 10820 si->dst_reg, si->src_reg, 10821 offsetof(struct sk_msg, sk)); 10822 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10823 offsetof(struct sock_common, skc_daddr)); 10824 break; 10825 10826 case offsetof(struct sk_msg_md, local_ip4): 10827 BUILD_BUG_ON(sizeof_field(struct sock_common, 10828 skc_rcv_saddr) != 4); 10829 10830 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10831 struct sk_msg, sk), 10832 si->dst_reg, si->src_reg, 10833 offsetof(struct sk_msg, sk)); 10834 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10835 offsetof(struct sock_common, 10836 skc_rcv_saddr)); 10837 break; 10838 10839 case offsetof(struct sk_msg_md, remote_ip6[0]) ... 10840 offsetof(struct sk_msg_md, remote_ip6[3]): 10841 #if IS_ENABLED(CONFIG_IPV6) 10842 BUILD_BUG_ON(sizeof_field(struct sock_common, 10843 skc_v6_daddr.s6_addr32[0]) != 4); 10844 10845 off = si->off; 10846 off -= offsetof(struct sk_msg_md, remote_ip6[0]); 10847 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10848 struct sk_msg, sk), 10849 si->dst_reg, si->src_reg, 10850 offsetof(struct sk_msg, sk)); 10851 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10852 offsetof(struct sock_common, 10853 skc_v6_daddr.s6_addr32[0]) + 10854 off); 10855 #else 10856 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 10857 #endif 10858 break; 10859 10860 case offsetof(struct sk_msg_md, local_ip6[0]) ... 10861 offsetof(struct sk_msg_md, local_ip6[3]): 10862 #if IS_ENABLED(CONFIG_IPV6) 10863 BUILD_BUG_ON(sizeof_field(struct sock_common, 10864 skc_v6_rcv_saddr.s6_addr32[0]) != 4); 10865 10866 off = si->off; 10867 off -= offsetof(struct sk_msg_md, local_ip6[0]); 10868 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10869 struct sk_msg, sk), 10870 si->dst_reg, si->src_reg, 10871 offsetof(struct sk_msg, sk)); 10872 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, 10873 offsetof(struct sock_common, 10874 skc_v6_rcv_saddr.s6_addr32[0]) + 10875 off); 10876 #else 10877 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 10878 #endif 10879 break; 10880 10881 case offsetof(struct sk_msg_md, remote_port): 10882 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); 10883 10884 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10885 struct sk_msg, sk), 10886 si->dst_reg, si->src_reg, 10887 offsetof(struct sk_msg, sk)); 10888 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10889 offsetof(struct sock_common, skc_dport)); 10890 #ifndef __BIG_ENDIAN_BITFIELD 10891 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); 10892 #endif 10893 break; 10894 10895 case offsetof(struct sk_msg_md, local_port): 10896 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); 10897 10898 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( 10899 struct sk_msg, sk), 10900 si->dst_reg, si->src_reg, 10901 offsetof(struct sk_msg, sk)); 10902 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, 10903 offsetof(struct sock_common, skc_num)); 10904 break; 10905 10906 case offsetof(struct sk_msg_md, size): 10907 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_sg, size), 10908 si->dst_reg, si->src_reg, 10909 offsetof(struct sk_msg_sg, size)); 10910 break; 10911 10912 case offsetof(struct sk_msg_md, sk): 10913 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, sk), 10914 si->dst_reg, si->src_reg, 10915 offsetof(struct sk_msg, sk)); 10916 break; 10917 } 10918 10919 return insn - insn_buf; 10920 } 10921 10922 const struct bpf_verifier_ops sk_filter_verifier_ops = { 10923 .get_func_proto = sk_filter_func_proto, 10924 .is_valid_access = sk_filter_is_valid_access, 10925 .convert_ctx_access = bpf_convert_ctx_access, 10926 .gen_ld_abs = bpf_gen_ld_abs, 10927 }; 10928 10929 const struct bpf_prog_ops sk_filter_prog_ops = { 10930 .test_run = bpf_prog_test_run_skb, 10931 }; 10932 10933 const struct bpf_verifier_ops tc_cls_act_verifier_ops = { 10934 .get_func_proto = tc_cls_act_func_proto, 10935 .is_valid_access = tc_cls_act_is_valid_access, 10936 .convert_ctx_access = tc_cls_act_convert_ctx_access, 10937 .gen_prologue = tc_cls_act_prologue, 10938 .gen_ld_abs = bpf_gen_ld_abs, 10939 .btf_struct_access = tc_cls_act_btf_struct_access, 10940 }; 10941 10942 const struct bpf_prog_ops tc_cls_act_prog_ops = { 10943 .test_run = bpf_prog_test_run_skb, 10944 }; 10945 10946 const struct bpf_verifier_ops xdp_verifier_ops = { 10947 .get_func_proto = xdp_func_proto, 10948 .is_valid_access = xdp_is_valid_access, 10949 .convert_ctx_access = xdp_convert_ctx_access, 10950 .gen_prologue = bpf_noop_prologue, 10951 .btf_struct_access = xdp_btf_struct_access, 10952 }; 10953 10954 const struct bpf_prog_ops xdp_prog_ops = { 10955 .test_run = bpf_prog_test_run_xdp, 10956 }; 10957 10958 const struct bpf_verifier_ops cg_skb_verifier_ops = { 10959 .get_func_proto = cg_skb_func_proto, 10960 .is_valid_access = cg_skb_is_valid_access, 10961 .convert_ctx_access = bpf_convert_ctx_access, 10962 }; 10963 10964 const struct bpf_prog_ops cg_skb_prog_ops = { 10965 .test_run = bpf_prog_test_run_skb, 10966 }; 10967 10968 const struct bpf_verifier_ops lwt_in_verifier_ops = { 10969 .get_func_proto = lwt_in_func_proto, 10970 .is_valid_access = lwt_is_valid_access, 10971 .convert_ctx_access = bpf_convert_ctx_access, 10972 }; 10973 10974 const struct bpf_prog_ops lwt_in_prog_ops = { 10975 .test_run = bpf_prog_test_run_skb, 10976 }; 10977 10978 const struct bpf_verifier_ops lwt_out_verifier_ops = { 10979 .get_func_proto = lwt_out_func_proto, 10980 .is_valid_access = lwt_is_valid_access, 10981 .convert_ctx_access = bpf_convert_ctx_access, 10982 }; 10983 10984 const struct bpf_prog_ops lwt_out_prog_ops = { 10985 .test_run = bpf_prog_test_run_skb, 10986 }; 10987 10988 const struct bpf_verifier_ops lwt_xmit_verifier_ops = { 10989 .get_func_proto = lwt_xmit_func_proto, 10990 .is_valid_access = lwt_is_valid_access, 10991 .convert_ctx_access = bpf_convert_ctx_access, 10992 .gen_prologue = tc_cls_act_prologue, 10993 }; 10994 10995 const struct bpf_prog_ops lwt_xmit_prog_ops = { 10996 .test_run = bpf_prog_test_run_skb, 10997 }; 10998 10999 const struct bpf_verifier_ops lwt_seg6local_verifier_ops = { 11000 .get_func_proto = lwt_seg6local_func_proto, 11001 .is_valid_access = lwt_is_valid_access, 11002 .convert_ctx_access = bpf_convert_ctx_access, 11003 }; 11004 11005 const struct bpf_prog_ops lwt_seg6local_prog_ops = { 11006 .test_run = bpf_prog_test_run_skb, 11007 }; 11008 11009 const struct bpf_verifier_ops cg_sock_verifier_ops = { 11010 .get_func_proto = sock_filter_func_proto, 11011 .is_valid_access = sock_filter_is_valid_access, 11012 .convert_ctx_access = bpf_sock_convert_ctx_access, 11013 }; 11014 11015 const struct bpf_prog_ops cg_sock_prog_ops = { 11016 }; 11017 11018 const struct bpf_verifier_ops cg_sock_addr_verifier_ops = { 11019 .get_func_proto = sock_addr_func_proto, 11020 .is_valid_access = sock_addr_is_valid_access, 11021 .convert_ctx_access = sock_addr_convert_ctx_access, 11022 }; 11023 11024 const struct bpf_prog_ops cg_sock_addr_prog_ops = { 11025 }; 11026 11027 const struct bpf_verifier_ops sock_ops_verifier_ops = { 11028 .get_func_proto = sock_ops_func_proto, 11029 .is_valid_access = sock_ops_is_valid_access, 11030 .convert_ctx_access = sock_ops_convert_ctx_access, 11031 }; 11032 11033 const struct bpf_prog_ops sock_ops_prog_ops = { 11034 }; 11035 11036 const struct bpf_verifier_ops sk_skb_verifier_ops = { 11037 .get_func_proto = sk_skb_func_proto, 11038 .is_valid_access = sk_skb_is_valid_access, 11039 .convert_ctx_access = sk_skb_convert_ctx_access, 11040 .gen_prologue = sk_skb_prologue, 11041 }; 11042 11043 const struct bpf_prog_ops sk_skb_prog_ops = { 11044 }; 11045 11046 const struct bpf_verifier_ops sk_msg_verifier_ops = { 11047 .get_func_proto = sk_msg_func_proto, 11048 .is_valid_access = sk_msg_is_valid_access, 11049 .convert_ctx_access = sk_msg_convert_ctx_access, 11050 .gen_prologue = bpf_noop_prologue, 11051 }; 11052 11053 const struct bpf_prog_ops sk_msg_prog_ops = { 11054 }; 11055 11056 const struct bpf_verifier_ops flow_dissector_verifier_ops = { 11057 .get_func_proto = flow_dissector_func_proto, 11058 .is_valid_access = flow_dissector_is_valid_access, 11059 .convert_ctx_access = flow_dissector_convert_ctx_access, 11060 }; 11061 11062 const struct bpf_prog_ops flow_dissector_prog_ops = { 11063 .test_run = bpf_prog_test_run_flow_dissector, 11064 }; 11065 11066 int sk_detach_filter(struct sock *sk) 11067 { 11068 int ret = -ENOENT; 11069 struct sk_filter *filter; 11070 11071 if (sock_flag(sk, SOCK_FILTER_LOCKED)) 11072 return -EPERM; 11073 11074 filter = rcu_dereference_protected(sk->sk_filter, 11075 lockdep_sock_is_held(sk)); 11076 if (filter) { 11077 RCU_INIT_POINTER(sk->sk_filter, NULL); 11078 sk_filter_uncharge(sk, filter); 11079 ret = 0; 11080 } 11081 11082 return ret; 11083 } 11084 EXPORT_SYMBOL_GPL(sk_detach_filter); 11085 11086 int sk_get_filter(struct sock *sk, sockptr_t optval, unsigned int len) 11087 { 11088 struct sock_fprog_kern *fprog; 11089 struct sk_filter *filter; 11090 int ret = 0; 11091 11092 sockopt_lock_sock(sk); 11093 filter = rcu_dereference_protected(sk->sk_filter, 11094 lockdep_sock_is_held(sk)); 11095 if (!filter) 11096 goto out; 11097 11098 /* We're copying the filter that has been originally attached, 11099 * so no conversion/decode needed anymore. eBPF programs that 11100 * have no original program cannot be dumped through this. 11101 */ 11102 ret = -EACCES; 11103 fprog = filter->prog->orig_prog; 11104 if (!fprog) 11105 goto out; 11106 11107 ret = fprog->len; 11108 if (!len) 11109 /* User space only enquires number of filter blocks. */ 11110 goto out; 11111 11112 ret = -EINVAL; 11113 if (len < fprog->len) 11114 goto out; 11115 11116 ret = -EFAULT; 11117 if (copy_to_sockptr(optval, fprog->filter, bpf_classic_proglen(fprog))) 11118 goto out; 11119 11120 /* Instead of bytes, the API requests to return the number 11121 * of filter blocks. 11122 */ 11123 ret = fprog->len; 11124 out: 11125 sockopt_release_sock(sk); 11126 return ret; 11127 } 11128 11129 #ifdef CONFIG_INET 11130 static void bpf_init_reuseport_kern(struct sk_reuseport_kern *reuse_kern, 11131 struct sock_reuseport *reuse, 11132 struct sock *sk, struct sk_buff *skb, 11133 struct sock *migrating_sk, 11134 u32 hash) 11135 { 11136 reuse_kern->skb = skb; 11137 reuse_kern->sk = sk; 11138 reuse_kern->selected_sk = NULL; 11139 reuse_kern->migrating_sk = migrating_sk; 11140 reuse_kern->data_end = skb->data + skb_headlen(skb); 11141 reuse_kern->hash = hash; 11142 reuse_kern->reuseport_id = reuse->reuseport_id; 11143 reuse_kern->bind_inany = reuse->bind_inany; 11144 } 11145 11146 struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk, 11147 struct bpf_prog *prog, struct sk_buff *skb, 11148 struct sock *migrating_sk, 11149 u32 hash) 11150 { 11151 struct sk_reuseport_kern reuse_kern; 11152 enum sk_action action; 11153 11154 bpf_init_reuseport_kern(&reuse_kern, reuse, sk, skb, migrating_sk, hash); 11155 action = bpf_prog_run(prog, &reuse_kern); 11156 11157 if (action == SK_PASS) 11158 return reuse_kern.selected_sk; 11159 else 11160 return ERR_PTR(-ECONNREFUSED); 11161 } 11162 11163 BPF_CALL_4(sk_select_reuseport, struct sk_reuseport_kern *, reuse_kern, 11164 struct bpf_map *, map, void *, key, u32, flags) 11165 { 11166 bool is_sockarray = map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY; 11167 struct sock_reuseport *reuse; 11168 struct sock *selected_sk; 11169 11170 selected_sk = map->ops->map_lookup_elem(map, key); 11171 if (!selected_sk) 11172 return -ENOENT; 11173 11174 reuse = rcu_dereference(selected_sk->sk_reuseport_cb); 11175 if (!reuse) { 11176 /* Lookup in sock_map can return TCP ESTABLISHED sockets. */ 11177 if (sk_is_refcounted(selected_sk)) 11178 sock_put(selected_sk); 11179 11180 /* reuseport_array has only sk with non NULL sk_reuseport_cb. 11181 * The only (!reuse) case here is - the sk has already been 11182 * unhashed (e.g. by close()), so treat it as -ENOENT. 11183 * 11184 * Other maps (e.g. sock_map) do not provide this guarantee and 11185 * the sk may never be in the reuseport group to begin with. 11186 */ 11187 return is_sockarray ? -ENOENT : -EINVAL; 11188 } 11189 11190 if (unlikely(reuse->reuseport_id != reuse_kern->reuseport_id)) { 11191 struct sock *sk = reuse_kern->sk; 11192 11193 if (sk->sk_protocol != selected_sk->sk_protocol) 11194 return -EPROTOTYPE; 11195 else if (sk->sk_family != selected_sk->sk_family) 11196 return -EAFNOSUPPORT; 11197 11198 /* Catch all. Likely bound to a different sockaddr. */ 11199 return -EBADFD; 11200 } 11201 11202 reuse_kern->selected_sk = selected_sk; 11203 11204 return 0; 11205 } 11206 11207 static const struct bpf_func_proto sk_select_reuseport_proto = { 11208 .func = sk_select_reuseport, 11209 .gpl_only = false, 11210 .ret_type = RET_INTEGER, 11211 .arg1_type = ARG_PTR_TO_CTX, 11212 .arg2_type = ARG_CONST_MAP_PTR, 11213 .arg3_type = ARG_PTR_TO_MAP_KEY, 11214 .arg4_type = ARG_ANYTHING, 11215 }; 11216 11217 BPF_CALL_4(sk_reuseport_load_bytes, 11218 const struct sk_reuseport_kern *, reuse_kern, u32, offset, 11219 void *, to, u32, len) 11220 { 11221 return ____bpf_skb_load_bytes(reuse_kern->skb, offset, to, len); 11222 } 11223 11224 static const struct bpf_func_proto sk_reuseport_load_bytes_proto = { 11225 .func = sk_reuseport_load_bytes, 11226 .gpl_only = false, 11227 .ret_type = RET_INTEGER, 11228 .arg1_type = ARG_PTR_TO_CTX, 11229 .arg2_type = ARG_ANYTHING, 11230 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 11231 .arg4_type = ARG_CONST_SIZE, 11232 }; 11233 11234 BPF_CALL_5(sk_reuseport_load_bytes_relative, 11235 const struct sk_reuseport_kern *, reuse_kern, u32, offset, 11236 void *, to, u32, len, u32, start_header) 11237 { 11238 return ____bpf_skb_load_bytes_relative(reuse_kern->skb, offset, to, 11239 len, start_header); 11240 } 11241 11242 static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto = { 11243 .func = sk_reuseport_load_bytes_relative, 11244 .gpl_only = false, 11245 .ret_type = RET_INTEGER, 11246 .arg1_type = ARG_PTR_TO_CTX, 11247 .arg2_type = ARG_ANYTHING, 11248 .arg3_type = ARG_PTR_TO_UNINIT_MEM, 11249 .arg4_type = ARG_CONST_SIZE, 11250 .arg5_type = ARG_ANYTHING, 11251 }; 11252 11253 static const struct bpf_func_proto * 11254 sk_reuseport_func_proto(enum bpf_func_id func_id, 11255 const struct bpf_prog *prog) 11256 { 11257 switch (func_id) { 11258 case BPF_FUNC_sk_select_reuseport: 11259 return &sk_select_reuseport_proto; 11260 case BPF_FUNC_skb_load_bytes: 11261 return &sk_reuseport_load_bytes_proto; 11262 case BPF_FUNC_skb_load_bytes_relative: 11263 return &sk_reuseport_load_bytes_relative_proto; 11264 case BPF_FUNC_get_socket_cookie: 11265 return &bpf_get_socket_ptr_cookie_proto; 11266 case BPF_FUNC_ktime_get_coarse_ns: 11267 return &bpf_ktime_get_coarse_ns_proto; 11268 default: 11269 return bpf_base_func_proto(func_id); 11270 } 11271 } 11272 11273 static bool 11274 sk_reuseport_is_valid_access(int off, int size, 11275 enum bpf_access_type type, 11276 const struct bpf_prog *prog, 11277 struct bpf_insn_access_aux *info) 11278 { 11279 const u32 size_default = sizeof(__u32); 11280 11281 if (off < 0 || off >= sizeof(struct sk_reuseport_md) || 11282 off % size || type != BPF_READ) 11283 return false; 11284 11285 switch (off) { 11286 case offsetof(struct sk_reuseport_md, data): 11287 info->reg_type = PTR_TO_PACKET; 11288 return size == sizeof(__u64); 11289 11290 case offsetof(struct sk_reuseport_md, data_end): 11291 info->reg_type = PTR_TO_PACKET_END; 11292 return size == sizeof(__u64); 11293 11294 case offsetof(struct sk_reuseport_md, hash): 11295 return size == size_default; 11296 11297 case offsetof(struct sk_reuseport_md, sk): 11298 info->reg_type = PTR_TO_SOCKET; 11299 return size == sizeof(__u64); 11300 11301 case offsetof(struct sk_reuseport_md, migrating_sk): 11302 info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL; 11303 return size == sizeof(__u64); 11304 11305 /* Fields that allow narrowing */ 11306 case bpf_ctx_range(struct sk_reuseport_md, eth_protocol): 11307 if (size < sizeof_field(struct sk_buff, protocol)) 11308 return false; 11309 fallthrough; 11310 case bpf_ctx_range(struct sk_reuseport_md, ip_protocol): 11311 case bpf_ctx_range(struct sk_reuseport_md, bind_inany): 11312 case bpf_ctx_range(struct sk_reuseport_md, len): 11313 bpf_ctx_record_field_size(info, size_default); 11314 return bpf_ctx_narrow_access_ok(off, size, size_default); 11315 11316 default: 11317 return false; 11318 } 11319 } 11320 11321 #define SK_REUSEPORT_LOAD_FIELD(F) ({ \ 11322 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \ 11323 si->dst_reg, si->src_reg, \ 11324 bpf_target_off(struct sk_reuseport_kern, F, \ 11325 sizeof_field(struct sk_reuseport_kern, F), \ 11326 target_size)); \ 11327 }) 11328 11329 #define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD) \ 11330 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \ 11331 struct sk_buff, \ 11332 skb, \ 11333 SKB_FIELD) 11334 11335 #define SK_REUSEPORT_LOAD_SK_FIELD(SK_FIELD) \ 11336 SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \ 11337 struct sock, \ 11338 sk, \ 11339 SK_FIELD) 11340 11341 static u32 sk_reuseport_convert_ctx_access(enum bpf_access_type type, 11342 const struct bpf_insn *si, 11343 struct bpf_insn *insn_buf, 11344 struct bpf_prog *prog, 11345 u32 *target_size) 11346 { 11347 struct bpf_insn *insn = insn_buf; 11348 11349 switch (si->off) { 11350 case offsetof(struct sk_reuseport_md, data): 11351 SK_REUSEPORT_LOAD_SKB_FIELD(data); 11352 break; 11353 11354 case offsetof(struct sk_reuseport_md, len): 11355 SK_REUSEPORT_LOAD_SKB_FIELD(len); 11356 break; 11357 11358 case offsetof(struct sk_reuseport_md, eth_protocol): 11359 SK_REUSEPORT_LOAD_SKB_FIELD(protocol); 11360 break; 11361 11362 case offsetof(struct sk_reuseport_md, ip_protocol): 11363 SK_REUSEPORT_LOAD_SK_FIELD(sk_protocol); 11364 break; 11365 11366 case offsetof(struct sk_reuseport_md, data_end): 11367 SK_REUSEPORT_LOAD_FIELD(data_end); 11368 break; 11369 11370 case offsetof(struct sk_reuseport_md, hash): 11371 SK_REUSEPORT_LOAD_FIELD(hash); 11372 break; 11373 11374 case offsetof(struct sk_reuseport_md, bind_inany): 11375 SK_REUSEPORT_LOAD_FIELD(bind_inany); 11376 break; 11377 11378 case offsetof(struct sk_reuseport_md, sk): 11379 SK_REUSEPORT_LOAD_FIELD(sk); 11380 break; 11381 11382 case offsetof(struct sk_reuseport_md, migrating_sk): 11383 SK_REUSEPORT_LOAD_FIELD(migrating_sk); 11384 break; 11385 } 11386 11387 return insn - insn_buf; 11388 } 11389 11390 const struct bpf_verifier_ops sk_reuseport_verifier_ops = { 11391 .get_func_proto = sk_reuseport_func_proto, 11392 .is_valid_access = sk_reuseport_is_valid_access, 11393 .convert_ctx_access = sk_reuseport_convert_ctx_access, 11394 }; 11395 11396 const struct bpf_prog_ops sk_reuseport_prog_ops = { 11397 }; 11398 11399 DEFINE_STATIC_KEY_FALSE(bpf_sk_lookup_enabled); 11400 EXPORT_SYMBOL(bpf_sk_lookup_enabled); 11401 11402 BPF_CALL_3(bpf_sk_lookup_assign, struct bpf_sk_lookup_kern *, ctx, 11403 struct sock *, sk, u64, flags) 11404 { 11405 if (unlikely(flags & ~(BPF_SK_LOOKUP_F_REPLACE | 11406 BPF_SK_LOOKUP_F_NO_REUSEPORT))) 11407 return -EINVAL; 11408 if (unlikely(sk && sk_is_refcounted(sk))) 11409 return -ESOCKTNOSUPPORT; /* reject non-RCU freed sockets */ 11410 if (unlikely(sk && sk_is_tcp(sk) && sk->sk_state != TCP_LISTEN)) 11411 return -ESOCKTNOSUPPORT; /* only accept TCP socket in LISTEN */ 11412 if (unlikely(sk && sk_is_udp(sk) && sk->sk_state != TCP_CLOSE)) 11413 return -ESOCKTNOSUPPORT; /* only accept UDP socket in CLOSE */ 11414 11415 /* Check if socket is suitable for packet L3/L4 protocol */ 11416 if (sk && sk->sk_protocol != ctx->protocol) 11417 return -EPROTOTYPE; 11418 if (sk && sk->sk_family != ctx->family && 11419 (sk->sk_family == AF_INET || ipv6_only_sock(sk))) 11420 return -EAFNOSUPPORT; 11421 11422 if (ctx->selected_sk && !(flags & BPF_SK_LOOKUP_F_REPLACE)) 11423 return -EEXIST; 11424 11425 /* Select socket as lookup result */ 11426 ctx->selected_sk = sk; 11427 ctx->no_reuseport = flags & BPF_SK_LOOKUP_F_NO_REUSEPORT; 11428 return 0; 11429 } 11430 11431 static const struct bpf_func_proto bpf_sk_lookup_assign_proto = { 11432 .func = bpf_sk_lookup_assign, 11433 .gpl_only = false, 11434 .ret_type = RET_INTEGER, 11435 .arg1_type = ARG_PTR_TO_CTX, 11436 .arg2_type = ARG_PTR_TO_SOCKET_OR_NULL, 11437 .arg3_type = ARG_ANYTHING, 11438 }; 11439 11440 static const struct bpf_func_proto * 11441 sk_lookup_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 11442 { 11443 switch (func_id) { 11444 case BPF_FUNC_perf_event_output: 11445 return &bpf_event_output_data_proto; 11446 case BPF_FUNC_sk_assign: 11447 return &bpf_sk_lookup_assign_proto; 11448 case BPF_FUNC_sk_release: 11449 return &bpf_sk_release_proto; 11450 default: 11451 return bpf_sk_base_func_proto(func_id); 11452 } 11453 } 11454 11455 static bool sk_lookup_is_valid_access(int off, int size, 11456 enum bpf_access_type type, 11457 const struct bpf_prog *prog, 11458 struct bpf_insn_access_aux *info) 11459 { 11460 if (off < 0 || off >= sizeof(struct bpf_sk_lookup)) 11461 return false; 11462 if (off % size != 0) 11463 return false; 11464 if (type != BPF_READ) 11465 return false; 11466 11467 switch (off) { 11468 case offsetof(struct bpf_sk_lookup, sk): 11469 info->reg_type = PTR_TO_SOCKET_OR_NULL; 11470 return size == sizeof(__u64); 11471 11472 case bpf_ctx_range(struct bpf_sk_lookup, family): 11473 case bpf_ctx_range(struct bpf_sk_lookup, protocol): 11474 case bpf_ctx_range(struct bpf_sk_lookup, remote_ip4): 11475 case bpf_ctx_range(struct bpf_sk_lookup, local_ip4): 11476 case bpf_ctx_range_till(struct bpf_sk_lookup, remote_ip6[0], remote_ip6[3]): 11477 case bpf_ctx_range_till(struct bpf_sk_lookup, local_ip6[0], local_ip6[3]): 11478 case bpf_ctx_range(struct bpf_sk_lookup, local_port): 11479 case bpf_ctx_range(struct bpf_sk_lookup, ingress_ifindex): 11480 bpf_ctx_record_field_size(info, sizeof(__u32)); 11481 return bpf_ctx_narrow_access_ok(off, size, sizeof(__u32)); 11482 11483 case bpf_ctx_range(struct bpf_sk_lookup, remote_port): 11484 /* Allow 4-byte access to 2-byte field for backward compatibility */ 11485 if (size == sizeof(__u32)) 11486 return true; 11487 bpf_ctx_record_field_size(info, sizeof(__be16)); 11488 return bpf_ctx_narrow_access_ok(off, size, sizeof(__be16)); 11489 11490 case offsetofend(struct bpf_sk_lookup, remote_port) ... 11491 offsetof(struct bpf_sk_lookup, local_ip4) - 1: 11492 /* Allow access to zero padding for backward compatibility */ 11493 bpf_ctx_record_field_size(info, sizeof(__u16)); 11494 return bpf_ctx_narrow_access_ok(off, size, sizeof(__u16)); 11495 11496 default: 11497 return false; 11498 } 11499 } 11500 11501 static u32 sk_lookup_convert_ctx_access(enum bpf_access_type type, 11502 const struct bpf_insn *si, 11503 struct bpf_insn *insn_buf, 11504 struct bpf_prog *prog, 11505 u32 *target_size) 11506 { 11507 struct bpf_insn *insn = insn_buf; 11508 11509 switch (si->off) { 11510 case offsetof(struct bpf_sk_lookup, sk): 11511 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg, 11512 offsetof(struct bpf_sk_lookup_kern, selected_sk)); 11513 break; 11514 11515 case offsetof(struct bpf_sk_lookup, family): 11516 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 11517 bpf_target_off(struct bpf_sk_lookup_kern, 11518 family, 2, target_size)); 11519 break; 11520 11521 case offsetof(struct bpf_sk_lookup, protocol): 11522 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 11523 bpf_target_off(struct bpf_sk_lookup_kern, 11524 protocol, 2, target_size)); 11525 break; 11526 11527 case offsetof(struct bpf_sk_lookup, remote_ip4): 11528 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 11529 bpf_target_off(struct bpf_sk_lookup_kern, 11530 v4.saddr, 4, target_size)); 11531 break; 11532 11533 case offsetof(struct bpf_sk_lookup, local_ip4): 11534 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 11535 bpf_target_off(struct bpf_sk_lookup_kern, 11536 v4.daddr, 4, target_size)); 11537 break; 11538 11539 case bpf_ctx_range_till(struct bpf_sk_lookup, 11540 remote_ip6[0], remote_ip6[3]): { 11541 #if IS_ENABLED(CONFIG_IPV6) 11542 int off = si->off; 11543 11544 off -= offsetof(struct bpf_sk_lookup, remote_ip6[0]); 11545 off += bpf_target_off(struct in6_addr, s6_addr32[0], 4, target_size); 11546 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg, 11547 offsetof(struct bpf_sk_lookup_kern, v6.saddr)); 11548 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 11549 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, off); 11550 #else 11551 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 11552 #endif 11553 break; 11554 } 11555 case bpf_ctx_range_till(struct bpf_sk_lookup, 11556 local_ip6[0], local_ip6[3]): { 11557 #if IS_ENABLED(CONFIG_IPV6) 11558 int off = si->off; 11559 11560 off -= offsetof(struct bpf_sk_lookup, local_ip6[0]); 11561 off += bpf_target_off(struct in6_addr, s6_addr32[0], 4, target_size); 11562 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg, 11563 offsetof(struct bpf_sk_lookup_kern, v6.daddr)); 11564 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); 11565 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, off); 11566 #else 11567 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 11568 #endif 11569 break; 11570 } 11571 case offsetof(struct bpf_sk_lookup, remote_port): 11572 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 11573 bpf_target_off(struct bpf_sk_lookup_kern, 11574 sport, 2, target_size)); 11575 break; 11576 11577 case offsetofend(struct bpf_sk_lookup, remote_port): 11578 *target_size = 2; 11579 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); 11580 break; 11581 11582 case offsetof(struct bpf_sk_lookup, local_port): 11583 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, 11584 bpf_target_off(struct bpf_sk_lookup_kern, 11585 dport, 2, target_size)); 11586 break; 11587 11588 case offsetof(struct bpf_sk_lookup, ingress_ifindex): 11589 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, 11590 bpf_target_off(struct bpf_sk_lookup_kern, 11591 ingress_ifindex, 4, target_size)); 11592 break; 11593 } 11594 11595 return insn - insn_buf; 11596 } 11597 11598 const struct bpf_prog_ops sk_lookup_prog_ops = { 11599 .test_run = bpf_prog_test_run_sk_lookup, 11600 }; 11601 11602 const struct bpf_verifier_ops sk_lookup_verifier_ops = { 11603 .get_func_proto = sk_lookup_func_proto, 11604 .is_valid_access = sk_lookup_is_valid_access, 11605 .convert_ctx_access = sk_lookup_convert_ctx_access, 11606 }; 11607 11608 #endif /* CONFIG_INET */ 11609 11610 DEFINE_BPF_DISPATCHER(xdp) 11611 11612 void bpf_prog_change_xdp(struct bpf_prog *prev_prog, struct bpf_prog *prog) 11613 { 11614 bpf_dispatcher_change_prog(BPF_DISPATCHER_PTR(xdp), prev_prog, prog); 11615 } 11616 11617 BTF_ID_LIST_GLOBAL(btf_sock_ids, MAX_BTF_SOCK_TYPE) 11618 #define BTF_SOCK_TYPE(name, type) BTF_ID(struct, type) 11619 BTF_SOCK_TYPE_xxx 11620 #undef BTF_SOCK_TYPE 11621 11622 BPF_CALL_1(bpf_skc_to_tcp6_sock, struct sock *, sk) 11623 { 11624 /* tcp6_sock type is not generated in dwarf and hence btf, 11625 * trigger an explicit type generation here. 11626 */ 11627 BTF_TYPE_EMIT(struct tcp6_sock); 11628 if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP && 11629 sk->sk_family == AF_INET6) 11630 return (unsigned long)sk; 11631 11632 return (unsigned long)NULL; 11633 } 11634 11635 const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto = { 11636 .func = bpf_skc_to_tcp6_sock, 11637 .gpl_only = false, 11638 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11639 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11640 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP6], 11641 }; 11642 11643 BPF_CALL_1(bpf_skc_to_tcp_sock, struct sock *, sk) 11644 { 11645 if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP) 11646 return (unsigned long)sk; 11647 11648 return (unsigned long)NULL; 11649 } 11650 11651 const struct bpf_func_proto bpf_skc_to_tcp_sock_proto = { 11652 .func = bpf_skc_to_tcp_sock, 11653 .gpl_only = false, 11654 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11655 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11656 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP], 11657 }; 11658 11659 BPF_CALL_1(bpf_skc_to_tcp_timewait_sock, struct sock *, sk) 11660 { 11661 /* BTF types for tcp_timewait_sock and inet_timewait_sock are not 11662 * generated if CONFIG_INET=n. Trigger an explicit generation here. 11663 */ 11664 BTF_TYPE_EMIT(struct inet_timewait_sock); 11665 BTF_TYPE_EMIT(struct tcp_timewait_sock); 11666 11667 #ifdef CONFIG_INET 11668 if (sk && sk->sk_prot == &tcp_prot && sk->sk_state == TCP_TIME_WAIT) 11669 return (unsigned long)sk; 11670 #endif 11671 11672 #if IS_BUILTIN(CONFIG_IPV6) 11673 if (sk && sk->sk_prot == &tcpv6_prot && sk->sk_state == TCP_TIME_WAIT) 11674 return (unsigned long)sk; 11675 #endif 11676 11677 return (unsigned long)NULL; 11678 } 11679 11680 const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto = { 11681 .func = bpf_skc_to_tcp_timewait_sock, 11682 .gpl_only = false, 11683 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11684 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11685 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP_TW], 11686 }; 11687 11688 BPF_CALL_1(bpf_skc_to_tcp_request_sock, struct sock *, sk) 11689 { 11690 #ifdef CONFIG_INET 11691 if (sk && sk->sk_prot == &tcp_prot && sk->sk_state == TCP_NEW_SYN_RECV) 11692 return (unsigned long)sk; 11693 #endif 11694 11695 #if IS_BUILTIN(CONFIG_IPV6) 11696 if (sk && sk->sk_prot == &tcpv6_prot && sk->sk_state == TCP_NEW_SYN_RECV) 11697 return (unsigned long)sk; 11698 #endif 11699 11700 return (unsigned long)NULL; 11701 } 11702 11703 const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto = { 11704 .func = bpf_skc_to_tcp_request_sock, 11705 .gpl_only = false, 11706 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11707 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11708 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP_REQ], 11709 }; 11710 11711 BPF_CALL_1(bpf_skc_to_udp6_sock, struct sock *, sk) 11712 { 11713 /* udp6_sock type is not generated in dwarf and hence btf, 11714 * trigger an explicit type generation here. 11715 */ 11716 BTF_TYPE_EMIT(struct udp6_sock); 11717 if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_UDP && 11718 sk->sk_type == SOCK_DGRAM && sk->sk_family == AF_INET6) 11719 return (unsigned long)sk; 11720 11721 return (unsigned long)NULL; 11722 } 11723 11724 const struct bpf_func_proto bpf_skc_to_udp6_sock_proto = { 11725 .func = bpf_skc_to_udp6_sock, 11726 .gpl_only = false, 11727 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11728 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11729 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_UDP6], 11730 }; 11731 11732 BPF_CALL_1(bpf_skc_to_unix_sock, struct sock *, sk) 11733 { 11734 /* unix_sock type is not generated in dwarf and hence btf, 11735 * trigger an explicit type generation here. 11736 */ 11737 BTF_TYPE_EMIT(struct unix_sock); 11738 if (sk && sk_fullsock(sk) && sk->sk_family == AF_UNIX) 11739 return (unsigned long)sk; 11740 11741 return (unsigned long)NULL; 11742 } 11743 11744 const struct bpf_func_proto bpf_skc_to_unix_sock_proto = { 11745 .func = bpf_skc_to_unix_sock, 11746 .gpl_only = false, 11747 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11748 .arg1_type = ARG_PTR_TO_BTF_ID_SOCK_COMMON, 11749 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_UNIX], 11750 }; 11751 11752 BPF_CALL_1(bpf_skc_to_mptcp_sock, struct sock *, sk) 11753 { 11754 BTF_TYPE_EMIT(struct mptcp_sock); 11755 return (unsigned long)bpf_mptcp_sock_from_subflow(sk); 11756 } 11757 11758 const struct bpf_func_proto bpf_skc_to_mptcp_sock_proto = { 11759 .func = bpf_skc_to_mptcp_sock, 11760 .gpl_only = false, 11761 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11762 .arg1_type = ARG_PTR_TO_SOCK_COMMON, 11763 .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_MPTCP], 11764 }; 11765 11766 BPF_CALL_1(bpf_sock_from_file, struct file *, file) 11767 { 11768 return (unsigned long)sock_from_file(file); 11769 } 11770 11771 BTF_ID_LIST(bpf_sock_from_file_btf_ids) 11772 BTF_ID(struct, socket) 11773 BTF_ID(struct, file) 11774 11775 const struct bpf_func_proto bpf_sock_from_file_proto = { 11776 .func = bpf_sock_from_file, 11777 .gpl_only = false, 11778 .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, 11779 .ret_btf_id = &bpf_sock_from_file_btf_ids[0], 11780 .arg1_type = ARG_PTR_TO_BTF_ID, 11781 .arg1_btf_id = &bpf_sock_from_file_btf_ids[1], 11782 }; 11783 11784 static const struct bpf_func_proto * 11785 bpf_sk_base_func_proto(enum bpf_func_id func_id) 11786 { 11787 const struct bpf_func_proto *func; 11788 11789 switch (func_id) { 11790 case BPF_FUNC_skc_to_tcp6_sock: 11791 func = &bpf_skc_to_tcp6_sock_proto; 11792 break; 11793 case BPF_FUNC_skc_to_tcp_sock: 11794 func = &bpf_skc_to_tcp_sock_proto; 11795 break; 11796 case BPF_FUNC_skc_to_tcp_timewait_sock: 11797 func = &bpf_skc_to_tcp_timewait_sock_proto; 11798 break; 11799 case BPF_FUNC_skc_to_tcp_request_sock: 11800 func = &bpf_skc_to_tcp_request_sock_proto; 11801 break; 11802 case BPF_FUNC_skc_to_udp6_sock: 11803 func = &bpf_skc_to_udp6_sock_proto; 11804 break; 11805 case BPF_FUNC_skc_to_unix_sock: 11806 func = &bpf_skc_to_unix_sock_proto; 11807 break; 11808 case BPF_FUNC_skc_to_mptcp_sock: 11809 func = &bpf_skc_to_mptcp_sock_proto; 11810 break; 11811 case BPF_FUNC_ktime_get_coarse_ns: 11812 return &bpf_ktime_get_coarse_ns_proto; 11813 default: 11814 return bpf_base_func_proto(func_id); 11815 } 11816 11817 if (!perfmon_capable()) 11818 return NULL; 11819 11820 return func; 11821 } 11822 11823 __diag_push(); 11824 __diag_ignore_all("-Wmissing-prototypes", 11825 "Global functions as their definitions will be in vmlinux BTF"); 11826 __bpf_kfunc int bpf_dynptr_from_skb(struct sk_buff *skb, u64 flags, 11827 struct bpf_dynptr_kern *ptr__uninit) 11828 { 11829 if (flags) { 11830 bpf_dynptr_set_null(ptr__uninit); 11831 return -EINVAL; 11832 } 11833 11834 bpf_dynptr_init(ptr__uninit, skb, BPF_DYNPTR_TYPE_SKB, 0, skb->len); 11835 11836 return 0; 11837 } 11838 11839 __bpf_kfunc int bpf_dynptr_from_xdp(struct xdp_buff *xdp, u64 flags, 11840 struct bpf_dynptr_kern *ptr__uninit) 11841 { 11842 if (flags) { 11843 bpf_dynptr_set_null(ptr__uninit); 11844 return -EINVAL; 11845 } 11846 11847 bpf_dynptr_init(ptr__uninit, xdp, BPF_DYNPTR_TYPE_XDP, 0, xdp_get_buff_len(xdp)); 11848 11849 return 0; 11850 } 11851 11852 __bpf_kfunc int bpf_sock_addr_set_sun_path(struct bpf_sock_addr_kern *sa_kern, 11853 const u8 *sun_path, u32 sun_path__sz) 11854 { 11855 struct sockaddr_un *un; 11856 11857 if (sa_kern->sk->sk_family != AF_UNIX) 11858 return -EINVAL; 11859 11860 /* We do not allow changing the address to unnamed or larger than the 11861 * maximum allowed address size for a unix sockaddr. 11862 */ 11863 if (sun_path__sz == 0 || sun_path__sz > UNIX_PATH_MAX) 11864 return -EINVAL; 11865 11866 un = (struct sockaddr_un *)sa_kern->uaddr; 11867 memcpy(un->sun_path, sun_path, sun_path__sz); 11868 sa_kern->uaddrlen = offsetof(struct sockaddr_un, sun_path) + sun_path__sz; 11869 11870 return 0; 11871 } 11872 __diag_pop(); 11873 11874 int bpf_dynptr_from_skb_rdonly(struct sk_buff *skb, u64 flags, 11875 struct bpf_dynptr_kern *ptr__uninit) 11876 { 11877 int err; 11878 11879 err = bpf_dynptr_from_skb(skb, flags, ptr__uninit); 11880 if (err) 11881 return err; 11882 11883 bpf_dynptr_set_rdonly(ptr__uninit); 11884 11885 return 0; 11886 } 11887 11888 BTF_SET8_START(bpf_kfunc_check_set_skb) 11889 BTF_ID_FLAGS(func, bpf_dynptr_from_skb) 11890 BTF_SET8_END(bpf_kfunc_check_set_skb) 11891 11892 BTF_SET8_START(bpf_kfunc_check_set_xdp) 11893 BTF_ID_FLAGS(func, bpf_dynptr_from_xdp) 11894 BTF_SET8_END(bpf_kfunc_check_set_xdp) 11895 11896 BTF_SET8_START(bpf_kfunc_check_set_sock_addr) 11897 BTF_ID_FLAGS(func, bpf_sock_addr_set_sun_path) 11898 BTF_SET8_END(bpf_kfunc_check_set_sock_addr) 11899 11900 static const struct btf_kfunc_id_set bpf_kfunc_set_skb = { 11901 .owner = THIS_MODULE, 11902 .set = &bpf_kfunc_check_set_skb, 11903 }; 11904 11905 static const struct btf_kfunc_id_set bpf_kfunc_set_xdp = { 11906 .owner = THIS_MODULE, 11907 .set = &bpf_kfunc_check_set_xdp, 11908 }; 11909 11910 static const struct btf_kfunc_id_set bpf_kfunc_set_sock_addr = { 11911 .owner = THIS_MODULE, 11912 .set = &bpf_kfunc_check_set_sock_addr, 11913 }; 11914 11915 static int __init bpf_kfunc_init(void) 11916 { 11917 int ret; 11918 11919 ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, &bpf_kfunc_set_skb); 11920 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_ACT, &bpf_kfunc_set_skb); 11921 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SK_SKB, &bpf_kfunc_set_skb); 11922 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SOCKET_FILTER, &bpf_kfunc_set_skb); 11923 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_CGROUP_SKB, &bpf_kfunc_set_skb); 11924 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_OUT, &bpf_kfunc_set_skb); 11925 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_IN, &bpf_kfunc_set_skb); 11926 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_XMIT, &bpf_kfunc_set_skb); 11927 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_LWT_SEG6LOCAL, &bpf_kfunc_set_skb); 11928 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_NETFILTER, &bpf_kfunc_set_skb); 11929 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP, &bpf_kfunc_set_xdp); 11930 return ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_CGROUP_SOCK_ADDR, 11931 &bpf_kfunc_set_sock_addr); 11932 } 11933 late_initcall(bpf_kfunc_init); 11934 11935 /* Disables missing prototype warnings */ 11936 __diag_push(); 11937 __diag_ignore_all("-Wmissing-prototypes", 11938 "Global functions as their definitions will be in vmlinux BTF"); 11939 11940 /* bpf_sock_destroy: Destroy the given socket with ECONNABORTED error code. 11941 * 11942 * The function expects a non-NULL pointer to a socket, and invokes the 11943 * protocol specific socket destroy handlers. 11944 * 11945 * The helper can only be called from BPF contexts that have acquired the socket 11946 * locks. 11947 * 11948 * Parameters: 11949 * @sock: Pointer to socket to be destroyed 11950 * 11951 * Return: 11952 * On error, may return EPROTONOSUPPORT, EINVAL. 11953 * EPROTONOSUPPORT if protocol specific destroy handler is not supported. 11954 * 0 otherwise 11955 */ 11956 __bpf_kfunc int bpf_sock_destroy(struct sock_common *sock) 11957 { 11958 struct sock *sk = (struct sock *)sock; 11959 11960 /* The locking semantics that allow for synchronous execution of the 11961 * destroy handlers are only supported for TCP and UDP. 11962 * Supporting protocols will need to acquire sock lock in the BPF context 11963 * prior to invoking this kfunc. 11964 */ 11965 if (!sk->sk_prot->diag_destroy || (sk->sk_protocol != IPPROTO_TCP && 11966 sk->sk_protocol != IPPROTO_UDP)) 11967 return -EOPNOTSUPP; 11968 11969 return sk->sk_prot->diag_destroy(sk, ECONNABORTED); 11970 } 11971 11972 __diag_pop() 11973 11974 BTF_SET8_START(bpf_sk_iter_kfunc_ids) 11975 BTF_ID_FLAGS(func, bpf_sock_destroy, KF_TRUSTED_ARGS) 11976 BTF_SET8_END(bpf_sk_iter_kfunc_ids) 11977 11978 static int tracing_iter_filter(const struct bpf_prog *prog, u32 kfunc_id) 11979 { 11980 if (btf_id_set8_contains(&bpf_sk_iter_kfunc_ids, kfunc_id) && 11981 prog->expected_attach_type != BPF_TRACE_ITER) 11982 return -EACCES; 11983 return 0; 11984 } 11985 11986 static const struct btf_kfunc_id_set bpf_sk_iter_kfunc_set = { 11987 .owner = THIS_MODULE, 11988 .set = &bpf_sk_iter_kfunc_ids, 11989 .filter = tracing_iter_filter, 11990 }; 11991 11992 static int init_subsystem(void) 11993 { 11994 return register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &bpf_sk_iter_kfunc_set); 11995 } 11996 late_initcall(init_subsystem); 11997