1 /* $OpenBSD: ipsec_input.c,v 1.63 2003/02/20 18:35:43 deraadt Exp $ */ 2 /*- 3 * The authors of this code are John Ioannidis (ji@tla.org), 4 * Angelos D. Keromytis (kermit@csd.uch.gr) and 5 * Niels Provos (provos@physnet.uni-hamburg.de). 6 * 7 * This code was written by John Ioannidis for BSD/OS in Athens, Greece, 8 * in November 1995. 9 * 10 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996, 11 * by Angelos D. Keromytis. 12 * 13 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis 14 * and Niels Provos. 15 * 16 * Additional features in 1999 by Angelos D. Keromytis. 17 * 18 * Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis, 19 * Angelos D. Keromytis and Niels Provos. 20 * Copyright (c) 2001, Angelos D. Keromytis. 21 * Copyright (c) 2016 Andrey V. Elsukov <ae@FreeBSD.org> 22 * 23 * Permission to use, copy, and modify this software with or without fee 24 * is hereby granted, provided that this entire notice is included in 25 * all copies of any software which is or includes a copy or 26 * modification of this software. 27 * You may use this code under the GNU public license if you so wish. Please 28 * contribute changes back to the authors under this freer than GPL license 29 * so that we may further the use of strong encryption without limitations to 30 * all. 31 * 32 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR 33 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY 34 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE 35 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR 36 * PURPOSE. 37 */ 38 39 /* 40 * IPsec input processing. 41 */ 42 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 #include "opt_inet.h" 47 #include "opt_inet6.h" 48 #include "opt_ipsec.h" 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/malloc.h> 53 #include <sys/mbuf.h> 54 #include <sys/domain.h> 55 #include <sys/protosw.h> 56 #include <sys/socket.h> 57 #include <sys/errno.h> 58 #include <sys/hhook.h> 59 #include <sys/syslog.h> 60 61 #include <net/if.h> 62 #include <net/if_var.h> 63 #include <net/if_enc.h> 64 #include <net/netisr.h> 65 #include <net/vnet.h> 66 67 #include <netinet/in.h> 68 #include <netinet/in_systm.h> 69 #include <netinet/ip.h> 70 #include <netinet/ip_var.h> 71 #include <netinet/ip_icmp.h> 72 #include <netinet/in_var.h> 73 #include <netinet/tcp_var.h> 74 75 #include <netinet/ip6.h> 76 #ifdef INET6 77 #include <netinet6/ip6_var.h> 78 #endif 79 #include <netinet/in_pcb.h> 80 #ifdef INET6 81 #include <netinet/icmp6.h> 82 #endif 83 84 #include <netipsec/ipsec.h> 85 #ifdef INET6 86 #include <netipsec/ipsec6.h> 87 #endif 88 #include <netipsec/ah_var.h> 89 #include <netipsec/esp.h> 90 #include <netipsec/esp_var.h> 91 #include <netipsec/ipcomp_var.h> 92 93 #include <netipsec/key.h> 94 #include <netipsec/keydb.h> 95 #include <netipsec/key_debug.h> 96 97 #include <netipsec/xform.h> 98 #include <netinet6/ip6protosw.h> 99 100 #include <machine/in_cksum.h> 101 #include <machine/stdarg.h> 102 103 #define IPSEC_ISTAT(proto, name) do { \ 104 if ((proto) == IPPROTO_ESP) \ 105 ESPSTAT_INC(esps_##name); \ 106 else if ((proto) == IPPROTO_AH) \ 107 AHSTAT_INC(ahs_##name); \ 108 else \ 109 IPCOMPSTAT_INC(ipcomps_##name); \ 110 } while (0) 111 112 /* 113 * ipsec_common_input gets called when an IPsec-protected packet 114 * is received by IPv4 or IPv6. Its job is to find the right SA 115 * and call the appropriate transform. The transform callback 116 * takes care of further processing (like ingress filtering). 117 */ 118 static int 119 ipsec_common_input(struct mbuf *m, int skip, int protoff, int af, int sproto) 120 { 121 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 122 union sockaddr_union dst_address; 123 struct secasvar *sav; 124 uint32_t spi; 125 int error; 126 127 IPSEC_ISTAT(sproto, input); 128 129 IPSEC_ASSERT(m != NULL, ("null packet")); 130 131 IPSEC_ASSERT(sproto == IPPROTO_ESP || sproto == IPPROTO_AH || 132 sproto == IPPROTO_IPCOMP, 133 ("unexpected security protocol %u", sproto)); 134 135 if ((sproto == IPPROTO_ESP && !V_esp_enable) || 136 (sproto == IPPROTO_AH && !V_ah_enable) || 137 (sproto == IPPROTO_IPCOMP && !V_ipcomp_enable)) { 138 m_freem(m); 139 IPSEC_ISTAT(sproto, pdrops); 140 return EOPNOTSUPP; 141 } 142 143 if (m->m_pkthdr.len - skip < 2 * sizeof (u_int32_t)) { 144 m_freem(m); 145 IPSEC_ISTAT(sproto, hdrops); 146 DPRINTF(("%s: packet too small\n", __func__)); 147 return EINVAL; 148 } 149 150 /* Retrieve the SPI from the relevant IPsec header */ 151 if (sproto == IPPROTO_ESP) 152 m_copydata(m, skip, sizeof(u_int32_t), (caddr_t) &spi); 153 else if (sproto == IPPROTO_AH) 154 m_copydata(m, skip + sizeof(u_int32_t), sizeof(u_int32_t), 155 (caddr_t) &spi); 156 else if (sproto == IPPROTO_IPCOMP) { 157 u_int16_t cpi; 158 m_copydata(m, skip + sizeof(u_int16_t), sizeof(u_int16_t), 159 (caddr_t) &cpi); 160 spi = ntohl(htons(cpi)); 161 } 162 163 /* 164 * Find the SA and (indirectly) call the appropriate 165 * kernel crypto routine. The resulting mbuf chain is a valid 166 * IP packet ready to go through input processing. 167 */ 168 bzero(&dst_address, sizeof (dst_address)); 169 dst_address.sa.sa_family = af; 170 switch (af) { 171 #ifdef INET 172 case AF_INET: 173 dst_address.sin.sin_len = sizeof(struct sockaddr_in); 174 m_copydata(m, offsetof(struct ip, ip_dst), 175 sizeof(struct in_addr), 176 (caddr_t) &dst_address.sin.sin_addr); 177 break; 178 #endif /* INET */ 179 #ifdef INET6 180 case AF_INET6: 181 dst_address.sin6.sin6_len = sizeof(struct sockaddr_in6); 182 m_copydata(m, offsetof(struct ip6_hdr, ip6_dst), 183 sizeof(struct in6_addr), 184 (caddr_t) &dst_address.sin6.sin6_addr); 185 /* We keep addresses in SADB without embedded scope id */ 186 if (IN6_IS_SCOPE_LINKLOCAL(&dst_address.sin6.sin6_addr)) { 187 /* XXX: sa6_recoverscope() */ 188 dst_address.sin6.sin6_scope_id = 189 ntohs(dst_address.sin6.sin6_addr.s6_addr16[1]); 190 dst_address.sin6.sin6_addr.s6_addr16[1] = 0; 191 } 192 break; 193 #endif /* INET6 */ 194 default: 195 DPRINTF(("%s: unsupported protocol family %u\n", __func__, af)); 196 m_freem(m); 197 IPSEC_ISTAT(sproto, nopf); 198 return EPFNOSUPPORT; 199 } 200 201 /* NB: only pass dst since key_allocsa follows RFC2401 */ 202 sav = key_allocsa(&dst_address, sproto, spi); 203 if (sav == NULL) { 204 DPRINTF(("%s: no key association found for SA %s/%08lx/%u\n", 205 __func__, ipsec_address(&dst_address, buf, sizeof(buf)), 206 (u_long) ntohl(spi), sproto)); 207 IPSEC_ISTAT(sproto, notdb); 208 m_freem(m); 209 return ENOENT; 210 } 211 212 if (sav->tdb_xform == NULL) { 213 DPRINTF(("%s: attempted to use uninitialized SA %s/%08lx/%u\n", 214 __func__, ipsec_address(&dst_address, buf, sizeof(buf)), 215 (u_long) ntohl(spi), sproto)); 216 IPSEC_ISTAT(sproto, noxform); 217 key_freesav(&sav); 218 m_freem(m); 219 return ENXIO; 220 } 221 222 /* 223 * Call appropriate transform and return -- callback takes care of 224 * everything else. 225 */ 226 error = (*sav->tdb_xform->xf_input)(m, sav, skip, protoff); 227 return (error); 228 } 229 230 #ifdef INET 231 extern struct protosw inetsw[]; 232 233 /* 234 * IPSEC_INPUT() method implementation for IPv4. 235 * 0 - Permitted by inbound security policy for further processing. 236 * EACCES - Forbidden by inbound security policy. 237 * EINPROGRESS - consumed by IPsec. 238 */ 239 int 240 ipsec4_input(struct mbuf *m, int offset, int proto) 241 { 242 243 switch (proto) { 244 case IPPROTO_AH: 245 case IPPROTO_ESP: 246 case IPPROTO_IPCOMP: 247 /* Do inbound IPsec processing for AH/ESP/IPCOMP */ 248 ipsec_common_input(m, offset, 249 offsetof(struct ip, ip_p), AF_INET, proto); 250 return (EINPROGRESS); /* mbuf consumed by IPsec */ 251 default: 252 /* 253 * Protocols with further headers get their IPsec treatment 254 * within the protocol specific processing. 255 */ 256 if ((inetsw[ip_protox[proto]].pr_flags & PR_LASTHDR) == 0) 257 return (0); 258 /* FALLTHROUGH */ 259 }; 260 /* 261 * Enforce IPsec policy checking if we are seeing last header. 262 */ 263 if (ipsec4_in_reject(m, NULL) != 0) { 264 /* Forbidden by inbound security policy */ 265 m_freem(m); 266 return (EACCES); 267 } 268 return (0); 269 } 270 271 int 272 ipsec4_ctlinput(int code, struct sockaddr *sa, void *v) 273 { 274 struct in_conninfo inc; 275 struct secasvar *sav; 276 struct icmp *icp; 277 struct ip *ip = v; 278 uint32_t pmtu, spi; 279 280 if (code != PRC_MSGSIZE || ip == NULL) 281 return (EINVAL); 282 if (sa->sa_family != AF_INET || 283 sa->sa_len != sizeof(struct sockaddr_in)) 284 return (EAFNOSUPPORT); 285 286 icp = __containerof(ip, struct icmp, icmp_ip); 287 pmtu = ntohs(icp->icmp_nextmtu); 288 289 if (pmtu < V_ip4_ipsec_min_pmtu) 290 return (EINVAL); 291 292 memcpy(&spi, (caddr_t)ip + (ip->ip_hl << 2), sizeof(spi)); 293 sav = key_allocsa((union sockaddr_union *)sa, ip->ip_p, spi); 294 if (sav == NULL) 295 return (ENOENT); 296 297 key_freesav(&sav); 298 299 memset(&inc, 0, sizeof(inc)); 300 inc.inc_faddr = satosin(sa)->sin_addr; 301 tcp_hc_updatemtu(&inc, pmtu); 302 return (0); 303 } 304 305 /* 306 * IPsec input callback for INET protocols. 307 * This routine is called as the transform callback. 308 * Takes care of filtering and other sanity checks on 309 * the processed packet. 310 */ 311 int 312 ipsec4_common_input_cb(struct mbuf *m, struct secasvar *sav, int skip, 313 int protoff) 314 { 315 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 316 struct epoch_tracker et; 317 struct ipsec_ctx_data ctx; 318 struct xform_history *xh; 319 struct secasindex *saidx; 320 struct m_tag *mtag; 321 struct ip *ip; 322 int error, prot, af, sproto, isr_prot; 323 324 IPSEC_ASSERT(sav != NULL, ("null SA")); 325 IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 326 saidx = &sav->sah->saidx; 327 af = saidx->dst.sa.sa_family; 328 IPSEC_ASSERT(af == AF_INET, ("unexpected af %u", af)); 329 sproto = saidx->proto; 330 IPSEC_ASSERT(sproto == IPPROTO_ESP || sproto == IPPROTO_AH || 331 sproto == IPPROTO_IPCOMP, 332 ("unexpected security protocol %u", sproto)); 333 334 if (skip != 0) { 335 /* 336 * Fix IPv4 header 337 */ 338 if (m->m_len < skip && (m = m_pullup(m, skip)) == NULL) { 339 DPRINTF(("%s: processing failed for SA %s/%08lx\n", 340 __func__, ipsec_address(&sav->sah->saidx.dst, 341 buf, sizeof(buf)), (u_long) ntohl(sav->spi))); 342 IPSEC_ISTAT(sproto, hdrops); 343 error = ENOBUFS; 344 goto bad; 345 } 346 347 ip = mtod(m, struct ip *); 348 ip->ip_len = htons(m->m_pkthdr.len); 349 ip->ip_sum = 0; 350 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 351 } else { 352 ip = mtod(m, struct ip *); 353 } 354 prot = ip->ip_p; 355 /* 356 * Check that we have NAT-T enabled and apply transport mode 357 * decapsulation NAT procedure (RFC3948). 358 * Do this before invoking into the PFIL. 359 */ 360 if (sav->natt != NULL && 361 (prot == IPPROTO_UDP || prot == IPPROTO_TCP)) 362 udp_ipsec_adjust_cksum(m, sav, prot, skip); 363 364 IPSEC_INIT_CTX(&ctx, &m, NULL, sav, AF_INET, IPSEC_ENC_BEFORE); 365 if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_IN)) != 0) 366 goto bad; 367 ip = mtod(m, struct ip *); /* update pointer */ 368 369 /* IP-in-IP encapsulation */ 370 if (prot == IPPROTO_IPIP && 371 saidx->mode != IPSEC_MODE_TRANSPORT) { 372 if (m->m_pkthdr.len - skip < sizeof(struct ip)) { 373 IPSEC_ISTAT(sproto, hdrops); 374 error = EINVAL; 375 goto bad; 376 } 377 /* enc0: strip outer IPv4 header */ 378 m_striphdr(m, 0, ip->ip_hl << 2); 379 } 380 #ifdef INET6 381 /* IPv6-in-IP encapsulation. */ 382 else if (prot == IPPROTO_IPV6 && 383 saidx->mode != IPSEC_MODE_TRANSPORT) { 384 if (m->m_pkthdr.len - skip < sizeof(struct ip6_hdr)) { 385 IPSEC_ISTAT(sproto, hdrops); 386 error = EINVAL; 387 goto bad; 388 } 389 /* enc0: strip IPv4 header, keep IPv6 header only */ 390 m_striphdr(m, 0, ip->ip_hl << 2); 391 } 392 #endif /* INET6 */ 393 else if (prot != IPPROTO_IPV6 && saidx->mode == IPSEC_MODE_ANY) { 394 /* 395 * When mode is wildcard, inner protocol is IPv6 and 396 * we have no INET6 support - drop this packet a bit later. 397 * In other cases we assume transport mode. Set prot to 398 * correctly choose netisr. 399 */ 400 prot = IPPROTO_IPIP; 401 } 402 403 /* 404 * Record what we've done to the packet (under what SA it was 405 * processed). 406 */ 407 if (sproto != IPPROTO_IPCOMP) { 408 mtag = m_tag_get(PACKET_TAG_IPSEC_IN_DONE, 409 sizeof(struct xform_history), M_NOWAIT); 410 if (mtag == NULL) { 411 DPRINTF(("%s: failed to get tag\n", __func__)); 412 IPSEC_ISTAT(sproto, hdrops); 413 error = ENOMEM; 414 goto bad; 415 } 416 417 xh = (struct xform_history *)(mtag + 1); 418 bcopy(&saidx->dst, &xh->dst, saidx->dst.sa.sa_len); 419 xh->spi = sav->spi; 420 xh->proto = sproto; 421 xh->mode = saidx->mode; 422 m_tag_prepend(m, mtag); 423 } 424 425 key_sa_recordxfer(sav, m); /* record data transfer */ 426 427 /* 428 * In transport mode requeue decrypted mbuf back to IPv4 protocol 429 * handler. This is necessary to correctly expose rcvif. 430 */ 431 if (saidx->mode == IPSEC_MODE_TRANSPORT) 432 prot = IPPROTO_IPIP; 433 /* 434 * Re-dispatch via software interrupt. 435 */ 436 switch (prot) { 437 case IPPROTO_IPIP: 438 isr_prot = NETISR_IP; 439 af = AF_INET; 440 break; 441 #ifdef INET6 442 case IPPROTO_IPV6: 443 isr_prot = NETISR_IPV6; 444 af = AF_INET6; 445 break; 446 #endif 447 default: 448 DPRINTF(("%s: cannot handle inner ip proto %d\n", 449 __func__, prot)); 450 IPSEC_ISTAT(sproto, nopf); 451 error = EPFNOSUPPORT; 452 goto bad; 453 } 454 455 IPSEC_INIT_CTX(&ctx, &m, NULL, sav, af, IPSEC_ENC_AFTER); 456 if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_IN)) != 0) 457 goto bad; 458 459 /* Handle virtual tunneling interfaces */ 460 if (saidx->mode == IPSEC_MODE_TUNNEL) 461 error = ipsec_if_input(m, sav, af); 462 if (error == 0) { 463 NET_EPOCH_ENTER(et); 464 error = netisr_queue_src(isr_prot, (uintptr_t)sav->spi, m); 465 NET_EPOCH_EXIT(et); 466 if (error) { 467 IPSEC_ISTAT(sproto, qfull); 468 DPRINTF(("%s: queue full; proto %u packet dropped\n", 469 __func__, sproto)); 470 } 471 } 472 key_freesav(&sav); 473 return (error); 474 bad: 475 key_freesav(&sav); 476 if (m != NULL) 477 m_freem(m); 478 return (error); 479 } 480 #endif /* INET */ 481 482 #ifdef INET6 483 /* 484 * IPSEC_INPUT() method implementation for IPv6. 485 * 0 - Permitted by inbound security policy for further processing. 486 * EACCES - Forbidden by inbound security policy. 487 * EINPROGRESS - consumed by IPsec. 488 */ 489 int 490 ipsec6_input(struct mbuf *m, int offset, int proto) 491 { 492 493 switch (proto) { 494 case IPPROTO_AH: 495 case IPPROTO_ESP: 496 case IPPROTO_IPCOMP: 497 /* Do inbound IPsec processing for AH/ESP/IPCOMP */ 498 ipsec_common_input(m, offset, 499 offsetof(struct ip6_hdr, ip6_nxt), AF_INET6, proto); 500 return (EINPROGRESS); /* mbuf consumed by IPsec */ 501 default: 502 /* 503 * Protocols with further headers get their IPsec treatment 504 * within the protocol specific processing. 505 */ 506 if ((inet6sw[ip6_protox[proto]].pr_flags & PR_LASTHDR) == 0) 507 return (0); 508 /* FALLTHROUGH */ 509 }; 510 /* 511 * Enforce IPsec policy checking if we are seeing last header. 512 */ 513 if (ipsec6_in_reject(m, NULL) != 0) { 514 /* Forbidden by inbound security policy */ 515 m_freem(m); 516 return (EACCES); 517 } 518 return (0); 519 } 520 521 int 522 ipsec6_ctlinput(int code, struct sockaddr *sa, void *v) 523 { 524 return (0); 525 } 526 527 /* 528 * IPsec input callback, called by the transform callback. Takes care of 529 * filtering and other sanity checks on the processed packet. 530 */ 531 int 532 ipsec6_common_input_cb(struct mbuf *m, struct secasvar *sav, int skip, 533 int protoff) 534 { 535 IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]); 536 struct epoch_tracker et; 537 struct ipsec_ctx_data ctx; 538 struct xform_history *xh; 539 struct secasindex *saidx; 540 struct ip6_hdr *ip6; 541 struct m_tag *mtag; 542 int prot, af, sproto; 543 int nxt, isr_prot; 544 int error, nest; 545 uint8_t nxt8; 546 547 IPSEC_ASSERT(sav != NULL, ("null SA")); 548 IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 549 saidx = &sav->sah->saidx; 550 af = saidx->dst.sa.sa_family; 551 IPSEC_ASSERT(af == AF_INET6, ("unexpected af %u", af)); 552 sproto = saidx->proto; 553 IPSEC_ASSERT(sproto == IPPROTO_ESP || sproto == IPPROTO_AH || 554 sproto == IPPROTO_IPCOMP, 555 ("unexpected security protocol %u", sproto)); 556 557 /* Fix IPv6 header */ 558 if (m->m_len < sizeof(struct ip6_hdr) && 559 (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 560 DPRINTF(("%s: processing failed for SA %s/%08lx\n", 561 __func__, ipsec_address(&sav->sah->saidx.dst, buf, 562 sizeof(buf)), (u_long) ntohl(sav->spi))); 563 564 IPSEC_ISTAT(sproto, hdrops); 565 error = EACCES; 566 goto bad; 567 } 568 569 IPSEC_INIT_CTX(&ctx, &m, NULL, sav, af, IPSEC_ENC_BEFORE); 570 if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_IN)) != 0) 571 goto bad; 572 573 ip6 = mtod(m, struct ip6_hdr *); 574 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 575 576 /* Save protocol */ 577 m_copydata(m, protoff, 1, &nxt8); 578 prot = nxt8; 579 580 /* IPv6-in-IP encapsulation */ 581 if (prot == IPPROTO_IPV6 && 582 saidx->mode != IPSEC_MODE_TRANSPORT) { 583 if (m->m_pkthdr.len - skip < sizeof(struct ip6_hdr)) { 584 IPSEC_ISTAT(sproto, hdrops); 585 error = EINVAL; 586 goto bad; 587 } 588 /* ip6n will now contain the inner IPv6 header. */ 589 m_striphdr(m, 0, skip); 590 skip = 0; 591 } 592 #ifdef INET 593 /* IP-in-IP encapsulation */ 594 else if (prot == IPPROTO_IPIP && 595 saidx->mode != IPSEC_MODE_TRANSPORT) { 596 if (m->m_pkthdr.len - skip < sizeof(struct ip)) { 597 IPSEC_ISTAT(sproto, hdrops); 598 error = EINVAL; 599 goto bad; 600 } 601 /* ipn will now contain the inner IPv4 header */ 602 m_striphdr(m, 0, skip); 603 skip = 0; 604 } 605 #endif /* INET */ 606 else { 607 prot = IPPROTO_IPV6; /* for correct BPF processing */ 608 } 609 610 /* 611 * Record what we've done to the packet (under what SA it was 612 * processed). 613 */ 614 if (sproto != IPPROTO_IPCOMP) { 615 mtag = m_tag_get(PACKET_TAG_IPSEC_IN_DONE, 616 sizeof(struct xform_history), M_NOWAIT); 617 if (mtag == NULL) { 618 DPRINTF(("%s: failed to get tag\n", __func__)); 619 IPSEC_ISTAT(sproto, hdrops); 620 error = ENOMEM; 621 goto bad; 622 } 623 624 xh = (struct xform_history *)(mtag + 1); 625 bcopy(&saidx->dst, &xh->dst, saidx->dst.sa.sa_len); 626 xh->spi = sav->spi; 627 xh->proto = sproto; 628 xh->mode = saidx->mode; 629 m_tag_prepend(m, mtag); 630 } 631 632 key_sa_recordxfer(sav, m); 633 634 #ifdef INET 635 if (prot == IPPROTO_IPIP) 636 af = AF_INET; 637 else 638 #endif 639 af = AF_INET6; 640 IPSEC_INIT_CTX(&ctx, &m, NULL, sav, af, IPSEC_ENC_AFTER); 641 if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_IN)) != 0) 642 goto bad; 643 if (skip == 0) { 644 /* 645 * We stripped outer IPv6 header. 646 * Now we should requeue decrypted packet via netisr. 647 */ 648 switch (prot) { 649 #ifdef INET 650 case IPPROTO_IPIP: 651 isr_prot = NETISR_IP; 652 break; 653 #endif 654 case IPPROTO_IPV6: 655 isr_prot = NETISR_IPV6; 656 break; 657 default: 658 DPRINTF(("%s: cannot handle inner ip proto %d\n", 659 __func__, prot)); 660 IPSEC_ISTAT(sproto, nopf); 661 error = EPFNOSUPPORT; 662 goto bad; 663 } 664 /* Handle virtual tunneling interfaces */ 665 if (saidx->mode == IPSEC_MODE_TUNNEL) 666 error = ipsec_if_input(m, sav, af); 667 if (error == 0) { 668 NET_EPOCH_ENTER(et); 669 error = netisr_queue_src(isr_prot, 670 (uintptr_t)sav->spi, m); 671 NET_EPOCH_EXIT(et); 672 if (error) { 673 IPSEC_ISTAT(sproto, qfull); 674 DPRINTF(("%s: queue full; proto %u packet" 675 " dropped\n", __func__, sproto)); 676 } 677 } 678 key_freesav(&sav); 679 return (error); 680 } 681 /* 682 * See the end of ip6_input for this logic. 683 * IPPROTO_IPV[46] case will be processed just like other ones 684 */ 685 nest = 0; 686 nxt = nxt8; 687 NET_EPOCH_ENTER(et); 688 while (nxt != IPPROTO_DONE) { 689 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 690 IP6STAT_INC(ip6s_toomanyhdr); 691 error = EINVAL; 692 goto bad_epoch; 693 } 694 695 /* 696 * Protection against faulty packet - there should be 697 * more sanity checks in header chain processing. 698 */ 699 if (m->m_pkthdr.len < skip) { 700 IP6STAT_INC(ip6s_tooshort); 701 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 702 error = EINVAL; 703 goto bad_epoch; 704 } 705 /* 706 * Enforce IPsec policy checking if we are seeing last header. 707 * note that we do not visit this with protocols with pcb layer 708 * code - like udp/tcp/raw ip. 709 */ 710 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 && 711 ipsec6_in_reject(m, NULL)) { 712 error = EINVAL; 713 goto bad_epoch; 714 } 715 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &skip, nxt); 716 } 717 NET_EPOCH_EXIT(et); 718 key_freesav(&sav); 719 return (0); 720 bad_epoch: 721 NET_EPOCH_EXIT(et); 722 bad: 723 key_freesav(&sav); 724 if (m) 725 m_freem(m); 726 return (error); 727 } 728 #endif /* INET6 */ 729