1 /*- 2 * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 /* 30 * IPsec output processing. 31 */ 32 #include "opt_inet.h" 33 #include "opt_inet6.h" 34 #include "opt_ipsec.h" 35 #include "opt_enc.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/mbuf.h> 40 #include <sys/domain.h> 41 #include <sys/protosw.h> 42 #include <sys/socket.h> 43 #include <sys/errno.h> 44 #include <sys/syslog.h> 45 46 #include <net/if.h> 47 #include <net/if_var.h> 48 #include <net/pfil.h> 49 #include <net/vnet.h> 50 51 #include <netinet/in.h> 52 #include <netinet/in_systm.h> 53 #include <netinet/ip.h> 54 #include <netinet/ip_var.h> 55 #include <netinet/in_var.h> 56 #include <netinet/ip_ecn.h> 57 #ifdef INET6 58 #include <netinet6/ip6_ecn.h> 59 #endif 60 61 #include <netinet/ip6.h> 62 #ifdef INET6 63 #include <netinet6/ip6_var.h> 64 #include <netinet6/scope6_var.h> 65 #endif 66 #include <netinet/in_pcb.h> 67 #ifdef INET6 68 #include <netinet/icmp6.h> 69 #endif 70 71 #include <netipsec/ipsec.h> 72 #ifdef INET6 73 #include <netipsec/ipsec6.h> 74 #endif 75 #include <netipsec/ah_var.h> 76 #include <netipsec/esp_var.h> 77 #include <netipsec/ipcomp_var.h> 78 79 #include <netipsec/xform.h> 80 81 #include <netipsec/key.h> 82 #include <netipsec/keydb.h> 83 #include <netipsec/key_debug.h> 84 85 #include <machine/in_cksum.h> 86 87 #ifdef IPSEC_NAT_T 88 #include <netinet/udp.h> 89 #endif 90 91 #ifdef DEV_ENC 92 #include <net/if_enc.h> 93 #endif 94 95 96 int 97 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 98 { 99 struct tdb_ident *tdbi; 100 struct m_tag *mtag; 101 struct secasvar *sav; 102 struct secasindex *saidx; 103 int error; 104 105 IPSEC_ASSERT(m != NULL, ("null mbuf")); 106 IPSEC_ASSERT(isr != NULL, ("null ISR")); 107 IPSEC_ASSERT(isr->sp != NULL, ("NULL isr->sp")); 108 sav = isr->sav; 109 IPSEC_ASSERT(sav != NULL, ("null SA")); 110 IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 111 112 saidx = &sav->sah->saidx; 113 switch (saidx->dst.sa.sa_family) { 114 #ifdef INET 115 case AF_INET: 116 /* Fix the header length, for AH processing. */ 117 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 118 break; 119 #endif /* INET */ 120 #ifdef INET6 121 case AF_INET6: 122 /* Fix the header length, for AH processing. */ 123 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 124 error = ENXIO; 125 goto bad; 126 } 127 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 128 /* No jumbogram support. */ 129 error = ENXIO; /*?*/ 130 goto bad; 131 } 132 mtod(m, struct ip6_hdr *)->ip6_plen = 133 htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 134 break; 135 #endif /* INET6 */ 136 default: 137 DPRINTF(("%s: unknown protocol family %u\n", __func__, 138 saidx->dst.sa.sa_family)); 139 error = ENXIO; 140 goto bad; 141 } 142 143 /* 144 * Add a record of what we've done or what needs to be done to the 145 * packet. 146 */ 147 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 148 sizeof(struct tdb_ident), M_NOWAIT); 149 if (mtag == NULL) { 150 DPRINTF(("%s: could not get packet tag\n", __func__)); 151 error = ENOMEM; 152 goto bad; 153 } 154 155 tdbi = (struct tdb_ident *)(mtag + 1); 156 tdbi->dst = saidx->dst; 157 tdbi->proto = saidx->proto; 158 tdbi->spi = sav->spi; 159 m_tag_prepend(m, mtag); 160 161 /* 162 * If there's another (bundled) SA to apply, do so. 163 * Note that this puts a burden on the kernel stack size. 164 * If this is a problem we'll need to introduce a queue 165 * to set the packet on so we can unwind the stack before 166 * doing further processing. 167 * 168 * If ipsec[46]_process_packet() will successfully queue 169 * the request, we need to take additional reference to SP, 170 * because xform callback will release reference. 171 */ 172 if (isr->next) { 173 /* XXX-BZ currently only support same AF bundles. */ 174 switch (saidx->dst.sa.sa_family) { 175 #ifdef INET 176 case AF_INET: 177 IPSECSTAT_INC(ips_out_bundlesa); 178 key_addref(isr->sp); 179 error = ipsec4_process_packet(m, isr->next); 180 if (error != 0) 181 KEY_FREESP(&isr->sp); 182 return (error); 183 /* NOTREACHED */ 184 #endif 185 #ifdef notyet 186 #ifdef INET6 187 case AF_INET6: 188 /* XXX */ 189 IPSEC6STAT_INC(ips_out_bundlesa); 190 key_addref(isr->sp); 191 error = ipsec6_process_packet(m, isr->next); 192 if (error != 0) 193 KEY_FREESP(&isr->sp); 194 return (error); 195 /* NOTREACHED */ 196 #endif /* INET6 */ 197 #endif 198 default: 199 DPRINTF(("%s: unknown protocol family %u\n", __func__, 200 saidx->dst.sa.sa_family)); 201 error = ENXIO; 202 goto bad; 203 } 204 } 205 key_sa_recordxfer(sav, m); /* record data transfer */ 206 207 /* 208 * We're done with IPsec processing, transmit the packet using the 209 * appropriate network protocol (IP or IPv6). 210 */ 211 switch (saidx->dst.sa.sa_family) { 212 #ifdef INET 213 case AF_INET: 214 #ifdef IPSEC_NAT_T 215 /* 216 * If NAT-T is enabled, now that all IPsec processing is done 217 * insert UDP encapsulation header after IP header. 218 */ 219 if (sav->natt_type) { 220 struct ip *ip = mtod(m, struct ip *); 221 const int hlen = (ip->ip_hl << 2); 222 int size, off; 223 struct mbuf *mi; 224 struct udphdr *udp; 225 226 size = sizeof(struct udphdr); 227 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) { 228 /* 229 * draft-ietf-ipsec-nat-t-ike-0[01].txt and 230 * draft-ietf-ipsec-udp-encaps-(00/)01.txt, 231 * ignoring possible AH mode 232 * non-IKE marker + non-ESP marker 233 * from draft-ietf-ipsec-udp-encaps-00.txt. 234 */ 235 size += sizeof(u_int64_t); 236 } 237 mi = m_makespace(m, hlen, size, &off); 238 if (mi == NULL) { 239 DPRINTF(("%s: m_makespace for udphdr failed\n", 240 __func__)); 241 error = ENOBUFS; 242 goto bad; 243 } 244 245 udp = (struct udphdr *)(mtod(mi, caddr_t) + off); 246 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 247 udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT); 248 else 249 udp->uh_sport = 250 KEY_PORTFROMSADDR(&sav->sah->saidx.src); 251 udp->uh_dport = KEY_PORTFROMSADDR(&sav->sah->saidx.dst); 252 udp->uh_sum = 0; 253 udp->uh_ulen = htons(m->m_pkthdr.len - hlen); 254 ip->ip_len = htons(m->m_pkthdr.len); 255 ip->ip_p = IPPROTO_UDP; 256 257 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 258 *(u_int64_t *)(udp + 1) = 0; 259 } 260 #endif /* IPSEC_NAT_T */ 261 262 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL); 263 #endif /* INET */ 264 #ifdef INET6 265 case AF_INET6: 266 /* 267 * We don't need massage, IPv6 header fields are always in 268 * net endian. 269 */ 270 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 271 #endif /* INET6 */ 272 } 273 panic("ipsec_process_done"); 274 bad: 275 m_freem(m); 276 return (error); 277 } 278 279 static struct ipsecrequest * 280 ipsec_nextisr( 281 struct mbuf *m, 282 struct ipsecrequest *isr, 283 int af, 284 struct secasindex *saidx, 285 int *error 286 ) 287 { 288 #define IPSEC_OSTAT(name) do { \ 289 if (isr->saidx.proto == IPPROTO_ESP) \ 290 ESPSTAT_INC(esps_##name); \ 291 else if (isr->saidx.proto == IPPROTO_AH)\ 292 AHSTAT_INC(ahs_##name); \ 293 else \ 294 IPCOMPSTAT_INC(ipcomps_##name); \ 295 } while (0) 296 struct secasvar *sav; 297 298 IPSECREQUEST_LOCK_ASSERT(isr); 299 300 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 301 ("invalid address family %u", af)); 302 again: 303 /* 304 * Craft SA index to search for proper SA. Note that 305 * we only fillin unspecified SA peers for transport 306 * mode; for tunnel mode they must already be filled in. 307 */ 308 *saidx = isr->saidx; 309 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 310 /* Fillin unspecified SA peers only for transport mode */ 311 if (af == AF_INET) { 312 struct sockaddr_in *sin; 313 struct ip *ip = mtod(m, struct ip *); 314 315 if (saidx->src.sa.sa_len == 0) { 316 sin = &saidx->src.sin; 317 sin->sin_len = sizeof(*sin); 318 sin->sin_family = AF_INET; 319 sin->sin_port = IPSEC_PORT_ANY; 320 sin->sin_addr = ip->ip_src; 321 } 322 if (saidx->dst.sa.sa_len == 0) { 323 sin = &saidx->dst.sin; 324 sin->sin_len = sizeof(*sin); 325 sin->sin_family = AF_INET; 326 sin->sin_port = IPSEC_PORT_ANY; 327 sin->sin_addr = ip->ip_dst; 328 } 329 } else { 330 struct sockaddr_in6 *sin6; 331 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 332 333 if (saidx->src.sin6.sin6_len == 0) { 334 sin6 = (struct sockaddr_in6 *)&saidx->src; 335 sin6->sin6_len = sizeof(*sin6); 336 sin6->sin6_family = AF_INET6; 337 sin6->sin6_port = IPSEC_PORT_ANY; 338 sin6->sin6_addr = ip6->ip6_src; 339 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 340 /* fix scope id for comparing SPD */ 341 sin6->sin6_addr.s6_addr16[1] = 0; 342 sin6->sin6_scope_id = 343 ntohs(ip6->ip6_src.s6_addr16[1]); 344 } 345 } 346 if (saidx->dst.sin6.sin6_len == 0) { 347 sin6 = (struct sockaddr_in6 *)&saidx->dst; 348 sin6->sin6_len = sizeof(*sin6); 349 sin6->sin6_family = AF_INET6; 350 sin6->sin6_port = IPSEC_PORT_ANY; 351 sin6->sin6_addr = ip6->ip6_dst; 352 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 353 /* fix scope id for comparing SPD */ 354 sin6->sin6_addr.s6_addr16[1] = 0; 355 sin6->sin6_scope_id = 356 ntohs(ip6->ip6_dst.s6_addr16[1]); 357 } 358 } 359 } 360 } 361 362 /* 363 * Lookup SA and validate it. 364 */ 365 *error = key_checkrequest(isr, saidx); 366 if (*error != 0) { 367 /* 368 * IPsec processing is required, but no SA found. 369 * I assume that key_acquire() had been called 370 * to get/establish the SA. Here I discard 371 * this packet because it is responsibility for 372 * upper layer to retransmit the packet. 373 */ 374 switch(af) { 375 case AF_INET: 376 IPSECSTAT_INC(ips_out_nosa); 377 break; 378 #ifdef INET6 379 case AF_INET6: 380 IPSEC6STAT_INC(ips_out_nosa); 381 break; 382 #endif 383 } 384 goto bad; 385 } 386 sav = isr->sav; 387 if (sav == NULL) { 388 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 389 ("no SA found, but required; level %u", 390 ipsec_get_reqlevel(isr))); 391 IPSECREQUEST_UNLOCK(isr); 392 isr = isr->next; 393 /* 394 * If isr is NULL, we found a 'use' policy w/o SA. 395 * Return w/o error and w/o isr so we can drop out 396 * and continue w/o IPsec processing. 397 */ 398 if (isr == NULL) 399 return isr; 400 IPSECREQUEST_LOCK(isr); 401 goto again; 402 } 403 404 /* 405 * Check system global policy controls. 406 */ 407 if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) || 408 (isr->saidx.proto == IPPROTO_AH && !V_ah_enable) || 409 (isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) { 410 DPRINTF(("%s: IPsec outbound packet dropped due" 411 " to policy (check your sysctls)\n", __func__)); 412 IPSEC_OSTAT(pdrops); 413 *error = EHOSTUNREACH; 414 goto bad; 415 } 416 417 /* 418 * Sanity check the SA contents for the caller 419 * before they invoke the xform output method. 420 */ 421 if (sav->tdb_xform == NULL) { 422 DPRINTF(("%s: no transform for SA\n", __func__)); 423 IPSEC_OSTAT(noxform); 424 *error = EHOSTUNREACH; 425 goto bad; 426 } 427 return isr; 428 bad: 429 IPSEC_ASSERT(*error != 0, ("error return w/ no error code")); 430 IPSECREQUEST_UNLOCK(isr); 431 return NULL; 432 #undef IPSEC_OSTAT 433 } 434 435 static int 436 ipsec_encap(struct mbuf **mp, struct secasindex *saidx) 437 { 438 #ifdef INET6 439 struct ip6_hdr *ip6; 440 #endif 441 struct ip *ip; 442 int setdf; 443 uint8_t itos, proto; 444 445 ip = mtod(*mp, struct ip *); 446 switch (ip->ip_v) { 447 #ifdef INET 448 case IPVERSION: 449 proto = IPPROTO_IPIP; 450 /* 451 * Collect IP_DF state from the inner header 452 * and honor system-wide control of how to handle it. 453 */ 454 switch (V_ip4_ipsec_dfbit) { 455 case 0: /* clear in outer header */ 456 case 1: /* set in outer header */ 457 setdf = V_ip4_ipsec_dfbit; 458 break; 459 default:/* propagate to outer header */ 460 setdf = (ip->ip_off & ntohs(IP_DF)) != 0; 461 } 462 itos = ip->ip_tos; 463 break; 464 #endif 465 #ifdef INET6 466 case (IPV6_VERSION >> 4): 467 proto = IPPROTO_IPV6; 468 ip6 = mtod(*mp, struct ip6_hdr *); 469 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 470 setdf = V_ip4_ipsec_dfbit ? 1: 0; 471 /* scoped address handling */ 472 in6_clearscope(&ip6->ip6_src); 473 in6_clearscope(&ip6->ip6_dst); 474 break; 475 #endif 476 default: 477 return (EAFNOSUPPORT); 478 } 479 switch (saidx->dst.sa.sa_family) { 480 #ifdef INET 481 case AF_INET: 482 if (saidx->src.sa.sa_family != AF_INET || 483 saidx->src.sin.sin_addr.s_addr == INADDR_ANY || 484 saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) 485 return (EINVAL); 486 M_PREPEND(*mp, sizeof(struct ip), M_NOWAIT); 487 if (*mp == NULL) 488 return (ENOBUFS); 489 ip = mtod(*mp, struct ip *); 490 ip->ip_v = IPVERSION; 491 ip->ip_hl = sizeof(struct ip) >> 2; 492 ip->ip_p = proto; 493 ip->ip_len = htons((*mp)->m_pkthdr.len); 494 ip->ip_ttl = V_ip_defttl; 495 ip->ip_sum = 0; 496 ip->ip_off = setdf ? htons(IP_DF): 0; 497 ip->ip_src = saidx->src.sin.sin_addr; 498 ip->ip_dst = saidx->dst.sin.sin_addr; 499 ip_ecn_ingress(V_ip4_ipsec_ecn, &ip->ip_tos, &itos); 500 ip_fillid(ip); 501 break; 502 #endif /* INET */ 503 #ifdef INET6 504 case AF_INET6: 505 if (saidx->src.sa.sa_family != AF_INET6 || 506 IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr) || 507 IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr)) 508 return (EINVAL); 509 M_PREPEND(*mp, sizeof(struct ip6_hdr), M_NOWAIT); 510 if (*mp == NULL) 511 return (ENOBUFS); 512 ip6 = mtod(*mp, struct ip6_hdr *); 513 ip6->ip6_flow = 0; 514 ip6->ip6_vfc = IPV6_VERSION; 515 ip6->ip6_hlim = V_ip6_defhlim; 516 ip6->ip6_nxt = proto; 517 ip6->ip6_dst = saidx->dst.sin6.sin6_addr; 518 /* For link-local address embed scope zone id */ 519 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) 520 ip6->ip6_dst.s6_addr16[1] = 521 htons(saidx->dst.sin6.sin6_scope_id & 0xffff); 522 ip6->ip6_src = saidx->src.sin6.sin6_addr; 523 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) 524 ip6->ip6_src.s6_addr16[1] = 525 htons(saidx->src.sin6.sin6_scope_id & 0xffff); 526 ip6->ip6_plen = htons((*mp)->m_pkthdr.len - sizeof(*ip6)); 527 ip_ecn_ingress(V_ip6_ipsec_ecn, &proto, &itos); 528 ip6->ip6_flow |= htonl((uint32_t)proto << 20); 529 break; 530 #endif /* INET6 */ 531 default: 532 return (EAFNOSUPPORT); 533 } 534 return (0); 535 } 536 537 #ifdef INET 538 /* 539 * IPsec output logic for IPv4. 540 */ 541 int 542 ipsec4_process_packet(struct mbuf *m, struct ipsecrequest *isr) 543 { 544 char sbuf[INET6_ADDRSTRLEN], dbuf[INET6_ADDRSTRLEN]; 545 union sockaddr_union *dst; 546 struct secasindex saidx; 547 struct secasvar *sav; 548 struct ip *ip; 549 int error, i, off; 550 551 IPSEC_ASSERT(m != NULL, ("null mbuf")); 552 IPSEC_ASSERT(isr != NULL, ("null isr")); 553 554 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 555 556 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 557 if (isr == NULL) { 558 if (error != 0) 559 goto bad; 560 return EJUSTRETURN; 561 } 562 563 sav = isr->sav; 564 if (m->m_len < sizeof(struct ip) && 565 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 566 error = ENOBUFS; 567 goto bad; 568 } 569 ip = mtod(m, struct ip *); 570 dst = &sav->sah->saidx.dst; 571 #ifdef DEV_ENC 572 if_inc_counter(encif, IFCOUNTER_OPACKETS, 1); 573 if_inc_counter(encif, IFCOUNTER_OBYTES, m->m_pkthdr.len); 574 575 /* pass the mbuf to enc0 for bpf processing */ 576 ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE); 577 /* pass the mbuf to enc0 for packet filtering */ 578 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 579 goto bad; 580 ip = mtod(m, struct ip *); 581 #endif 582 /* Do the appropriate encapsulation, if necessary */ 583 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 584 dst->sa.sa_family != AF_INET || /* PF mismatch */ 585 (dst->sa.sa_family == AF_INET && /* Proxy */ 586 dst->sin.sin_addr.s_addr != INADDR_ANY && 587 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 588 /* Fix IPv4 header checksum and length */ 589 ip->ip_len = htons(m->m_pkthdr.len); 590 ip->ip_sum = 0; 591 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 592 error = ipsec_encap(&m, &sav->sah->saidx); 593 if (error != 0) { 594 DPRINTF(("%s: encapsulation for SA %s->%s " 595 "SPI 0x%08x failed with error %d\n", __func__, 596 ipsec_address(&sav->sah->saidx.src, sbuf, 597 sizeof(sbuf)), 598 ipsec_address(&sav->sah->saidx.dst, dbuf, 599 sizeof(dbuf)), ntohl(sav->spi), error)); 600 goto bad; 601 } 602 } 603 #ifdef DEV_ENC 604 /* pass the mbuf to enc0 for bpf processing */ 605 ipsec_bpf(m, sav, sav->sah->saidx.dst.sa.sa_family, ENC_OUT|ENC_AFTER); 606 /* pass the mbuf to enc0 for packet filtering */ 607 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 608 goto bad; 609 #endif 610 611 /* 612 * Dispatch to the appropriate IPsec transform logic. The 613 * packet will be returned for transmission after crypto 614 * processing, etc. are completed. 615 * 616 * NB: m & sav are ``passed to caller'' who's reponsible for 617 * for reclaiming their resources. 618 */ 619 switch(dst->sa.sa_family) { 620 case AF_INET: 621 ip = mtod(m, struct ip *); 622 i = ip->ip_hl << 2; 623 off = offsetof(struct ip, ip_p); 624 break; 625 #ifdef INET6 626 case AF_INET6: 627 i = sizeof(struct ip6_hdr); 628 off = offsetof(struct ip6_hdr, ip6_nxt); 629 break; 630 #endif /* INET6 */ 631 default: 632 DPRINTF(("%s: unsupported protocol family %u\n", 633 __func__, dst->sa.sa_family)); 634 error = EPFNOSUPPORT; 635 IPSECSTAT_INC(ips_out_inval); 636 goto bad; 637 } 638 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 639 IPSECREQUEST_UNLOCK(isr); 640 return (error); 641 bad: 642 if (isr) 643 IPSECREQUEST_UNLOCK(isr); 644 if (m) 645 m_freem(m); 646 return error; 647 } 648 #endif 649 650 651 #ifdef INET6 652 static int 653 in6_sa_equal_addrwithscope(const struct sockaddr_in6 *sa, const struct in6_addr *ia) 654 { 655 struct in6_addr ia2; 656 657 memcpy(&ia2, &sa->sin6_addr, sizeof(ia2)); 658 if (IN6_IS_SCOPE_LINKLOCAL(&sa->sin6_addr)) 659 ia2.s6_addr16[1] = htons(sa->sin6_scope_id); 660 661 return IN6_ARE_ADDR_EQUAL(ia, &ia2); 662 } 663 664 /* 665 * IPsec output logic for IPv6. 666 */ 667 int 668 ipsec6_process_packet(struct mbuf *m, struct ipsecrequest *isr) 669 { 670 char sbuf[INET6_ADDRSTRLEN], dbuf[INET6_ADDRSTRLEN]; 671 struct secasindex saidx; 672 struct secasvar *sav; 673 struct ip6_hdr *ip6; 674 int error, i, off; 675 union sockaddr_union *dst; 676 677 IPSEC_ASSERT(m != NULL, ("ipsec6_process_packet: null mbuf")); 678 IPSEC_ASSERT(isr != NULL, ("ipsec6_process_packet: null isr")); 679 680 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 681 682 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 683 if (isr == NULL) { 684 if (error != 0) 685 goto bad; 686 return EJUSTRETURN; 687 } 688 sav = isr->sav; 689 dst = &sav->sah->saidx.dst; 690 691 ip6 = mtod(m, struct ip6_hdr *); 692 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6)); 693 #ifdef DEV_ENC 694 if_inc_counter(encif, IFCOUNTER_OPACKETS, 1); 695 if_inc_counter(encif, IFCOUNTER_OBYTES, m->m_pkthdr.len); 696 697 /* pass the mbuf to enc0 for bpf processing */ 698 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE); 699 /* pass the mbuf to enc0 for packet filtering */ 700 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 701 goto bad; 702 ip6 = mtod(m, struct ip6_hdr *); 703 #endif /* DEV_ENC */ 704 705 /* Do the appropriate encapsulation, if necessary */ 706 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 707 dst->sa.sa_family != AF_INET6 || /* PF mismatch */ 708 ((dst->sa.sa_family == AF_INET6) && 709 (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) && 710 (!in6_sa_equal_addrwithscope(&dst->sin6, 711 &ip6->ip6_dst)))) { 712 if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) { 713 /* No jumbogram support. */ 714 error = ENXIO; /*XXX*/ 715 goto bad; 716 } 717 error = ipsec_encap(&m, &sav->sah->saidx); 718 if (error != 0) { 719 DPRINTF(("%s: encapsulation for SA %s->%s " 720 "SPI 0x%08x failed with error %d\n", __func__, 721 ipsec_address(&sav->sah->saidx.src, sbuf, 722 sizeof(sbuf)), 723 ipsec_address(&sav->sah->saidx.dst, dbuf, 724 sizeof(dbuf)), ntohl(sav->spi), error)); 725 goto bad; 726 } 727 } 728 729 #ifdef DEV_ENC 730 ipsec_bpf(m, isr->sav, dst->sa.sa_family, ENC_OUT|ENC_AFTER); 731 /* pass the mbuf to enc0 for packet filtering */ 732 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 733 goto bad; 734 #endif /* DEV_ENC */ 735 736 switch(dst->sa.sa_family) { 737 #ifdef INET 738 case AF_INET: 739 { 740 struct ip *ip; 741 ip = mtod(m, struct ip *); 742 i = ip->ip_hl << 2; 743 off = offsetof(struct ip, ip_p); 744 } 745 break; 746 #endif /* AF_INET */ 747 case AF_INET6: 748 i = sizeof(struct ip6_hdr); 749 off = offsetof(struct ip6_hdr, ip6_nxt); 750 break; 751 default: 752 DPRINTF(("%s: unsupported protocol family %u\n", 753 __func__, dst->sa.sa_family)); 754 error = EPFNOSUPPORT; 755 IPSEC6STAT_INC(ips_out_inval); 756 goto bad; 757 } 758 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 759 IPSECREQUEST_UNLOCK(isr); 760 return error; 761 bad: 762 763 if (isr) 764 IPSECREQUEST_UNLOCK(isr); 765 if (m) 766 m_freem(m); 767 return error; 768 } 769 #endif /*INET6*/ 770