ipsec_output.c revision 275708
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: head/sys/netipsec/ipsec_output.c 275708 2014-12-11 17:34:49Z ae $ 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#endif 65#include <netinet/in_pcb.h> 66#ifdef INET6 67#include <netinet/icmp6.h> 68#endif 69 70#include <netipsec/ipsec.h> 71#ifdef INET6 72#include <netipsec/ipsec6.h> 73#endif 74#include <netipsec/ah_var.h> 75#include <netipsec/esp_var.h> 76#include <netipsec/ipcomp_var.h> 77 78#include <netipsec/xform.h> 79 80#include <netipsec/key.h> 81#include <netipsec/keydb.h> 82#include <netipsec/key_debug.h> 83 84#include <machine/in_cksum.h> 85 86#ifdef IPSEC_NAT_T 87#include <netinet/udp.h> 88#endif 89 90#ifdef DEV_ENC 91#include <net/if_enc.h> 92#endif 93 94 95int 96ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 97{ 98 struct tdb_ident *tdbi; 99 struct m_tag *mtag; 100 struct secasvar *sav; 101 struct secasindex *saidx; 102 int error; 103 104 IPSEC_ASSERT(m != NULL, ("null mbuf")); 105 IPSEC_ASSERT(isr != NULL, ("null ISR")); 106 sav = isr->sav; 107 IPSEC_ASSERT(sav != NULL, ("null SA")); 108 IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 109 110 saidx = &sav->sah->saidx; 111 switch (saidx->dst.sa.sa_family) { 112#ifdef INET 113 case AF_INET: 114 /* Fix the header length, for AH processing. */ 115 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 116 break; 117#endif /* INET */ 118#ifdef INET6 119 case AF_INET6: 120 /* Fix the header length, for AH processing. */ 121 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 122 error = ENXIO; 123 goto bad; 124 } 125 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 126 /* No jumbogram support. */ 127 error = ENXIO; /*?*/ 128 goto bad; 129 } 130 mtod(m, struct ip6_hdr *)->ip6_plen = 131 htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 132 break; 133#endif /* INET6 */ 134 default: 135 DPRINTF(("%s: unknown protocol family %u\n", __func__, 136 saidx->dst.sa.sa_family)); 137 error = ENXIO; 138 goto bad; 139 } 140 141 /* 142 * Add a record of what we've done or what needs to be done to the 143 * packet. 144 */ 145 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 146 sizeof(struct tdb_ident), M_NOWAIT); 147 if (mtag == NULL) { 148 DPRINTF(("%s: could not get packet tag\n", __func__)); 149 error = ENOMEM; 150 goto bad; 151 } 152 153 tdbi = (struct tdb_ident *)(mtag + 1); 154 tdbi->dst = saidx->dst; 155 tdbi->proto = saidx->proto; 156 tdbi->spi = sav->spi; 157 m_tag_prepend(m, mtag); 158 159 /* 160 * If there's another (bundled) SA to apply, do so. 161 * Note that this puts a burden on the kernel stack size. 162 * If this is a problem we'll need to introduce a queue 163 * to set the packet on so we can unwind the stack before 164 * doing further processing. 165 */ 166 if (isr->next) { 167 /* XXX-BZ currently only support same AF bundles. */ 168 switch (saidx->dst.sa.sa_family) { 169#ifdef INET 170 case AF_INET: 171 IPSECSTAT_INC(ips_out_bundlesa); 172 return ipsec4_process_packet(m, isr->next); 173 /* NOTREACHED */ 174#endif 175#ifdef notyet 176#ifdef INET6 177 case AF_INET6: 178 /* XXX */ 179 IPSEC6STAT_INC(ips_out_bundlesa); 180 return ipsec6_process_packet(m, isr->next); 181 /* NOTREACHED */ 182#endif /* INET6 */ 183#endif 184 default: 185 DPRINTF(("%s: unknown protocol family %u\n", __func__, 186 saidx->dst.sa.sa_family)); 187 error = ENXIO; 188 goto bad; 189 } 190 } 191 key_sa_recordxfer(sav, m); /* record data transfer */ 192 193 /* 194 * We're done with IPsec processing, transmit the packet using the 195 * appropriate network protocol (IP or IPv6). SPD lookup will be 196 * performed again there. 197 */ 198 switch (saidx->dst.sa.sa_family) { 199#ifdef INET 200 case AF_INET: 201#ifdef IPSEC_NAT_T 202 /* 203 * If NAT-T is enabled, now that all IPsec processing is done 204 * insert UDP encapsulation header after IP header. 205 */ 206 if (sav->natt_type) { 207 struct ip *ip = mtod(m, struct ip *); 208 const int hlen = (ip->ip_hl << 2); 209 int size, off; 210 struct mbuf *mi; 211 struct udphdr *udp; 212 213 size = sizeof(struct udphdr); 214 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) { 215 /* 216 * draft-ietf-ipsec-nat-t-ike-0[01].txt and 217 * draft-ietf-ipsec-udp-encaps-(00/)01.txt, 218 * ignoring possible AH mode 219 * non-IKE marker + non-ESP marker 220 * from draft-ietf-ipsec-udp-encaps-00.txt. 221 */ 222 size += sizeof(u_int64_t); 223 } 224 mi = m_makespace(m, hlen, size, &off); 225 if (mi == NULL) { 226 DPRINTF(("%s: m_makespace for udphdr failed\n", 227 __func__)); 228 error = ENOBUFS; 229 goto bad; 230 } 231 232 udp = (struct udphdr *)(mtod(mi, caddr_t) + off); 233 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 234 udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT); 235 else 236 udp->uh_sport = 237 KEY_PORTFROMSADDR(&sav->sah->saidx.src); 238 udp->uh_dport = KEY_PORTFROMSADDR(&sav->sah->saidx.dst); 239 udp->uh_sum = 0; 240 udp->uh_ulen = htons(m->m_pkthdr.len - hlen); 241 ip->ip_len = htons(m->m_pkthdr.len); 242 ip->ip_p = IPPROTO_UDP; 243 244 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 245 *(u_int64_t *)(udp + 1) = 0; 246 } 247#endif /* IPSEC_NAT_T */ 248 249 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL); 250#endif /* INET */ 251#ifdef INET6 252 case AF_INET6: 253 /* 254 * We don't need massage, IPv6 header fields are always in 255 * net endian. 256 */ 257 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 258#endif /* INET6 */ 259 } 260 panic("ipsec_process_done"); 261bad: 262 m_freem(m); 263 return (error); 264} 265 266static struct ipsecrequest * 267ipsec_nextisr( 268 struct mbuf *m, 269 struct ipsecrequest *isr, 270 int af, 271 struct secasindex *saidx, 272 int *error 273) 274{ 275#define IPSEC_OSTAT(name) do { \ 276 if (isr->saidx.proto == IPPROTO_ESP) \ 277 ESPSTAT_INC(esps_##name); \ 278 else if (isr->saidx.proto == IPPROTO_AH)\ 279 AHSTAT_INC(ahs_##name); \ 280 else \ 281 IPCOMPSTAT_INC(ipcomps_##name); \ 282} while (0) 283 struct secasvar *sav; 284 285 IPSECREQUEST_LOCK_ASSERT(isr); 286 287 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 288 ("invalid address family %u", af)); 289again: 290 /* 291 * Craft SA index to search for proper SA. Note that 292 * we only fillin unspecified SA peers for transport 293 * mode; for tunnel mode they must already be filled in. 294 */ 295 *saidx = isr->saidx; 296 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 297 /* Fillin unspecified SA peers only for transport mode */ 298 if (af == AF_INET) { 299 struct sockaddr_in *sin; 300 struct ip *ip = mtod(m, struct ip *); 301 302 if (saidx->src.sa.sa_len == 0) { 303 sin = &saidx->src.sin; 304 sin->sin_len = sizeof(*sin); 305 sin->sin_family = AF_INET; 306 sin->sin_port = IPSEC_PORT_ANY; 307 sin->sin_addr = ip->ip_src; 308 } 309 if (saidx->dst.sa.sa_len == 0) { 310 sin = &saidx->dst.sin; 311 sin->sin_len = sizeof(*sin); 312 sin->sin_family = AF_INET; 313 sin->sin_port = IPSEC_PORT_ANY; 314 sin->sin_addr = ip->ip_dst; 315 } 316 } else { 317 struct sockaddr_in6 *sin6; 318 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 319 320 if (saidx->src.sin6.sin6_len == 0) { 321 sin6 = (struct sockaddr_in6 *)&saidx->src; 322 sin6->sin6_len = sizeof(*sin6); 323 sin6->sin6_family = AF_INET6; 324 sin6->sin6_port = IPSEC_PORT_ANY; 325 sin6->sin6_addr = ip6->ip6_src; 326 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 327 /* fix scope id for comparing SPD */ 328 sin6->sin6_addr.s6_addr16[1] = 0; 329 sin6->sin6_scope_id = 330 ntohs(ip6->ip6_src.s6_addr16[1]); 331 } 332 } 333 if (saidx->dst.sin6.sin6_len == 0) { 334 sin6 = (struct sockaddr_in6 *)&saidx->dst; 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_dst; 339 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 340 /* fix scope id for comparing SPD */ 341 sin6->sin6_addr.s6_addr16[1] = 0; 342 sin6->sin6_scope_id = 343 ntohs(ip6->ip6_dst.s6_addr16[1]); 344 } 345 } 346 } 347 } 348 349 /* 350 * Lookup SA and validate it. 351 */ 352 *error = key_checkrequest(isr, saidx); 353 if (*error != 0) { 354 /* 355 * IPsec processing is required, but no SA found. 356 * I assume that key_acquire() had been called 357 * to get/establish the SA. Here I discard 358 * this packet because it is responsibility for 359 * upper layer to retransmit the packet. 360 */ 361 switch(af) { 362 case AF_INET: 363 IPSECSTAT_INC(ips_out_nosa); 364 break; 365#ifdef INET6 366 case AF_INET6: 367 IPSEC6STAT_INC(ips_out_nosa); 368 break; 369#endif 370 } 371 goto bad; 372 } 373 sav = isr->sav; 374 if (sav == NULL) { 375 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 376 ("no SA found, but required; level %u", 377 ipsec_get_reqlevel(isr))); 378 IPSECREQUEST_UNLOCK(isr); 379 isr = isr->next; 380 /* 381 * If isr is NULL, we found a 'use' policy w/o SA. 382 * Return w/o error and w/o isr so we can drop out 383 * and continue w/o IPsec processing. 384 */ 385 if (isr == NULL) 386 return isr; 387 IPSECREQUEST_LOCK(isr); 388 goto again; 389 } 390 391 /* 392 * Check system global policy controls. 393 */ 394 if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) || 395 (isr->saidx.proto == IPPROTO_AH && !V_ah_enable) || 396 (isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) { 397 DPRINTF(("%s: IPsec outbound packet dropped due" 398 " to policy (check your sysctls)\n", __func__)); 399 IPSEC_OSTAT(pdrops); 400 *error = EHOSTUNREACH; 401 goto bad; 402 } 403 404 /* 405 * Sanity check the SA contents for the caller 406 * before they invoke the xform output method. 407 */ 408 if (sav->tdb_xform == NULL) { 409 DPRINTF(("%s: no transform for SA\n", __func__)); 410 IPSEC_OSTAT(noxform); 411 *error = EHOSTUNREACH; 412 goto bad; 413 } 414 return isr; 415bad: 416 IPSEC_ASSERT(*error != 0, ("error return w/ no error code")); 417 IPSECREQUEST_UNLOCK(isr); 418 return NULL; 419#undef IPSEC_OSTAT 420} 421 422#ifdef INET 423/* 424 * IPsec output logic for IPv4. 425 */ 426int 427ipsec4_process_packet(struct mbuf *m, struct ipsecrequest *isr) 428{ 429 union sockaddr_union *dst; 430 struct secasindex saidx; 431 struct secasvar *sav; 432 struct ip *ip; 433 int error, i, off, setdf; 434 435 IPSEC_ASSERT(m != NULL, ("null mbuf")); 436 IPSEC_ASSERT(isr != NULL, ("null isr")); 437 438 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 439 440 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 441 if (isr == NULL) { 442 if (error != 0) 443 goto bad; 444 return EJUSTRETURN; 445 } 446 447 sav = isr->sav; 448 if (m->m_len < sizeof(struct ip) && 449 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 450 error = ENOBUFS; 451 goto bad; 452 } 453 ip = mtod(m, struct ip *); 454 dst = &sav->sah->saidx.dst; 455#ifdef DEV_ENC 456 if_inc_counter(encif, IFCOUNTER_OPACKETS, 1); 457 if_inc_counter(encif, IFCOUNTER_OBYTES, m->m_pkthdr.len); 458 459 /* pass the mbuf to enc0 for bpf processing */ 460 ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE); 461 /* pass the mbuf to enc0 for packet filtering */ 462 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 463 goto bad; 464#endif 465 /* Do the appropriate encapsulation, if necessary */ 466 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 467 dst->sa.sa_family != AF_INET || /* PF mismatch */ 468#if 0 469 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 470 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 471#endif 472 (dst->sa.sa_family == AF_INET && /* Proxy */ 473 dst->sin.sin_addr.s_addr != INADDR_ANY && 474 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 475 struct mbuf *mp; 476 477 /* Fix IPv4 header checksum and length */ 478 ip->ip_len = htons(m->m_pkthdr.len); 479 ip->ip_sum = 0; 480 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 481 /* 482 * Collect IP_DF state from the outer header 483 * and honor system-wide control of how to handle it. 484 */ 485 switch (V_ip4_ipsec_dfbit) { 486 case 0: /* clear in outer header */ 487 case 1: /* set in outer header */ 488 setdf = V_ip4_ipsec_dfbit; 489 break; 490 default: /* propagate to outer header */ 491 setdf = ntohs(ip->ip_off & IP_DF); 492 } 493 /* Encapsulate the packet */ 494 error = ipip_output(m, isr, &mp, 0, 0); 495 if (error != 0) { 496 m = NULL; /* ipip_output() already freed it */ 497 goto bad; 498 } 499 m = mp; 500 /* 501 * ipip_output clears IP_DF in the new header. If 502 * we need to propagate IP_DF from the outer header, 503 * then we have to do it here. 504 * 505 * XXX shouldn't assume what ipip_output does. 506 */ 507 if (dst->sa.sa_family == AF_INET && setdf) { 508 ip = mtod(m, struct ip *); 509 ip->ip_off = ntohs(ip->ip_off); 510 ip->ip_off |= IP_DF; 511 ip->ip_off = htons(ip->ip_off); 512 } 513 } 514 515#ifdef DEV_ENC 516 /* pass the mbuf to enc0 for bpf processing */ 517 ipsec_bpf(m, sav, sav->sah->saidx.dst.sa.sa_family, ENC_OUT|ENC_AFTER); 518 /* pass the mbuf to enc0 for packet filtering */ 519 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 520 goto bad; 521#endif 522 523 /* 524 * Dispatch to the appropriate IPsec transform logic. The 525 * packet will be returned for transmission after crypto 526 * processing, etc. are completed. For encapsulation we 527 * bypass this call because of the explicit call done above 528 * (necessary to deal with IP_DF handling for IPv4). 529 * 530 * NB: m & sav are ``passed to caller'' who's reponsible for 531 * for reclaiming their resources. 532 */ 533 if (sav->tdb_xform->xf_type != XF_IP4) { 534 union sockaddr_union *dst = &sav->sah->saidx.dst; 535 switch(dst->sa.sa_family) { 536 case AF_INET: 537 ip = mtod(m, struct ip *); 538 i = ip->ip_hl << 2; 539 off = offsetof(struct ip, ip_p); 540 break; 541#ifdef INET6 542 case AF_INET6: 543 i = sizeof(struct ip6_hdr); 544 off = offsetof(struct ip6_hdr, ip6_nxt); 545 break; 546#endif /* INET6 */ 547 default: 548 DPRINTF(("%s: unsupported protocol family %u\n", 549 __func__, dst->sa.sa_family)); 550 error = EPFNOSUPPORT; 551 IPSECSTAT_INC(ips_out_inval); 552 goto bad; 553 } 554 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 555 } else { 556 error = ipsec_process_done(m, isr); 557 } 558 IPSECREQUEST_UNLOCK(isr); 559 return error; 560bad: 561 if (isr) 562 IPSECREQUEST_UNLOCK(isr); 563 if (m) 564 m_freem(m); 565 return error; 566} 567#endif 568 569 570#ifdef INET6 571static int 572in6_sa_equal_addrwithscope(const struct sockaddr_in6 *sa, const struct in6_addr *ia) 573{ 574 struct in6_addr ia2; 575 576 memcpy(&ia2, &sa->sin6_addr, sizeof(ia2)); 577 if (IN6_IS_SCOPE_LINKLOCAL(&sa->sin6_addr)) 578 ia2.s6_addr16[1] = htons(sa->sin6_scope_id); 579 580 return IN6_ARE_ADDR_EQUAL(ia, &ia2); 581} 582 583/* 584 * IPsec output logic for IPv6. 585 */ 586int 587ipsec6_process_packet( 588 struct mbuf *m, 589 struct ipsecrequest *isr 590 ) 591{ 592 struct secasindex saidx; 593 struct secasvar *sav; 594 struct ip6_hdr *ip6; 595 int error, i, off; 596 union sockaddr_union *dst; 597 598 IPSEC_ASSERT(m != NULL, ("ipsec6_process_packet: null mbuf")); 599 IPSEC_ASSERT(isr != NULL, ("ipsec6_process_packet: null isr")); 600 601 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 602 603 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 604 if (isr == NULL) { 605 if (error != 0) 606 goto bad; 607 return EJUSTRETURN; 608 } 609 610 sav = isr->sav; 611 dst = &sav->sah->saidx.dst; 612 613 ip6 = mtod(m, struct ip6_hdr *); 614 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6)); 615#ifdef DEV_ENC 616 if_inc_counter(encif, IFCOUNTER_OPACKETS, 1); 617 if_inc_counter(encif, IFCOUNTER_OBYTES, m->m_pkthdr.len); 618 619 /* pass the mbuf to enc0 for bpf processing */ 620 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE); 621 /* pass the mbuf to enc0 for packet filtering */ 622 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 623 goto bad; 624#endif /* DEV_ENC */ 625 626 /* Do the appropriate encapsulation, if necessary */ 627 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 628 dst->sa.sa_family != AF_INET6 || /* PF mismatch */ 629 ((dst->sa.sa_family == AF_INET6) && 630 (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) && 631 (!in6_sa_equal_addrwithscope(&dst->sin6, 632 &ip6->ip6_dst)))) { 633 struct mbuf *mp; 634 635 /* Fix IPv6 header payload length. */ 636 if (m->m_len < sizeof(struct ip6_hdr)) 637 if ((m = m_pullup(m,sizeof(struct ip6_hdr))) == NULL) { 638 error = ENOBUFS; 639 goto bad; 640 } 641 642 if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) { 643 /* No jumbogram support. */ 644 error = ENXIO; /*XXX*/ 645 goto bad; 646 } 647 648 /* Encapsulate the packet */ 649 error = ipip_output(m, isr, &mp, 0, 0); 650 if (mp == NULL && !error) { 651 /* Should never happen. */ 652 DPRINTF(("ipsec6_process_packet: ipip_output " 653 "returns no mbuf and no error!")); 654 error = EFAULT; 655 goto bad; 656 } 657 658 if (error) { 659 if (mp) { 660 /* XXX: Should never happen! */ 661 m_freem(mp); 662 } 663 m = NULL; /* ipip_output() already freed it */ 664 goto bad; 665 } 666 667 m = mp; 668 mp = NULL; 669 } 670 671#ifdef DEV_ENC 672 ipsec_bpf(m, isr->sav, dst->sa.sa_family, ENC_OUT|ENC_AFTER); 673 /* pass the mbuf to enc0 for packet filtering */ 674 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 675 goto bad; 676#endif /* DEV_ENC */ 677 678 switch(dst->sa.sa_family) { 679#ifdef INET 680 case AF_INET: 681 { 682 struct ip *ip; 683 ip = mtod(m, struct ip *); 684 i = ip->ip_hl << 2; 685 off = offsetof(struct ip, ip_p); 686 } 687 break; 688#endif /* AF_INET */ 689 case AF_INET6: 690 i = sizeof(struct ip6_hdr); 691 off = offsetof(struct ip6_hdr, ip6_nxt); 692 break; 693 default: 694 DPRINTF(("%s: unsupported protocol family %u\n", 695 __func__, dst->sa.sa_family)); 696 error = EPFNOSUPPORT; 697 IPSEC6STAT_INC(ips_out_inval); 698 goto bad; 699 } 700 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 701 IPSECREQUEST_UNLOCK(isr); 702 return error; 703bad: 704 705 if (isr) 706 IPSECREQUEST_UNLOCK(isr); 707 if (m) 708 m_freem(m); 709 return error; 710} 711#endif /*INET6*/ 712