ipsec_output.c revision 274132
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: stable/10/sys/netipsec/ipsec_output.c 274132 2014-11-05 09:23:29Z 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/pfil.h> 48#include <net/route.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 IPSECSTAT_INC(ips_out_bundlesa); 168 /* XXX-BZ currently only support same AF bundles. */ 169 switch (saidx->dst.sa.sa_family) { 170#ifdef INET 171 case AF_INET: 172 return ipsec4_process_packet(m, isr->next, 0, 0); 173 /* NOTREACHED */ 174#endif 175#ifdef notyet 176#ifdef INET6 177 case AF_INET6: 178 /* XXX */ 179 return ipsec6_process_packet(m, isr->next); 180 /* NOTREACHED */ 181#endif /* INET6 */ 182#endif 183 default: 184 DPRINTF(("%s: unknown protocol family %u\n", __func__, 185 saidx->dst.sa.sa_family)); 186 error = ENXIO; 187 goto bad; 188 } 189 } 190 key_sa_recordxfer(sav, m); /* record data transfer */ 191 192 /* 193 * We're done with IPsec processing, transmit the packet using the 194 * appropriate network protocol (IP or IPv6). SPD lookup will be 195 * performed again there. 196 */ 197 switch (saidx->dst.sa.sa_family) { 198#ifdef INET 199 case AF_INET: 200#ifdef IPSEC_NAT_T 201 /* 202 * If NAT-T is enabled, now that all IPsec processing is done 203 * insert UDP encapsulation header after IP header. 204 */ 205 if (sav->natt_type) { 206 struct ip *ip = mtod(m, struct ip *); 207 const int hlen = (ip->ip_hl << 2); 208 int size, off; 209 struct mbuf *mi; 210 struct udphdr *udp; 211 212 size = sizeof(struct udphdr); 213 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) { 214 /* 215 * draft-ietf-ipsec-nat-t-ike-0[01].txt and 216 * draft-ietf-ipsec-udp-encaps-(00/)01.txt, 217 * ignoring possible AH mode 218 * non-IKE marker + non-ESP marker 219 * from draft-ietf-ipsec-udp-encaps-00.txt. 220 */ 221 size += sizeof(u_int64_t); 222 } 223 mi = m_makespace(m, hlen, size, &off); 224 if (mi == NULL) { 225 DPRINTF(("%s: m_makespace for udphdr failed\n", 226 __func__)); 227 error = ENOBUFS; 228 goto bad; 229 } 230 231 udp = (struct udphdr *)(mtod(mi, caddr_t) + off); 232 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 233 udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT); 234 else 235 udp->uh_sport = 236 KEY_PORTFROMSADDR(&sav->sah->saidx.src); 237 udp->uh_dport = KEY_PORTFROMSADDR(&sav->sah->saidx.dst); 238 udp->uh_sum = 0; 239 udp->uh_ulen = htons(m->m_pkthdr.len - hlen); 240 ip->ip_len = htons(m->m_pkthdr.len); 241 ip->ip_p = IPPROTO_UDP; 242 243 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 244 *(u_int64_t *)(udp + 1) = 0; 245 } 246#endif /* IPSEC_NAT_T */ 247 248 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL); 249#endif /* INET */ 250#ifdef INET6 251 case AF_INET6: 252 /* 253 * We don't need massage, IPv6 header fields are always in 254 * net endian. 255 */ 256 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 257#endif /* INET6 */ 258 } 259 panic("ipsec_process_done"); 260bad: 261 m_freem(m); 262 return (error); 263} 264 265static struct ipsecrequest * 266ipsec_nextisr( 267 struct mbuf *m, 268 struct ipsecrequest *isr, 269 int af, 270 struct secasindex *saidx, 271 int *error 272) 273{ 274#define IPSEC_OSTAT(name) do { \ 275 if (isr->saidx.proto == IPPROTO_ESP) \ 276 ESPSTAT_INC(esps_##name); \ 277 else if (isr->saidx.proto == IPPROTO_AH)\ 278 AHSTAT_INC(ahs_##name); \ 279 else \ 280 IPCOMPSTAT_INC(ipcomps_##name); \ 281} while (0) 282 struct secasvar *sav; 283 284 IPSECREQUEST_LOCK_ASSERT(isr); 285 286 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 287 ("invalid address family %u", af)); 288again: 289 /* 290 * Craft SA index to search for proper SA. Note that 291 * we only fillin unspecified SA peers for transport 292 * mode; for tunnel mode they must already be filled in. 293 */ 294 *saidx = isr->saidx; 295 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 296 /* Fillin unspecified SA peers only for transport mode */ 297 if (af == AF_INET) { 298 struct sockaddr_in *sin; 299 struct ip *ip = mtod(m, struct ip *); 300 301 if (saidx->src.sa.sa_len == 0) { 302 sin = &saidx->src.sin; 303 sin->sin_len = sizeof(*sin); 304 sin->sin_family = AF_INET; 305 sin->sin_port = IPSEC_PORT_ANY; 306 sin->sin_addr = ip->ip_src; 307 } 308 if (saidx->dst.sa.sa_len == 0) { 309 sin = &saidx->dst.sin; 310 sin->sin_len = sizeof(*sin); 311 sin->sin_family = AF_INET; 312 sin->sin_port = IPSEC_PORT_ANY; 313 sin->sin_addr = ip->ip_dst; 314 } 315 } else { 316 struct sockaddr_in6 *sin6; 317 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 318 319 if (saidx->src.sin6.sin6_len == 0) { 320 sin6 = (struct sockaddr_in6 *)&saidx->src; 321 sin6->sin6_len = sizeof(*sin6); 322 sin6->sin6_family = AF_INET6; 323 sin6->sin6_port = IPSEC_PORT_ANY; 324 sin6->sin6_addr = ip6->ip6_src; 325 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 326 /* fix scope id for comparing SPD */ 327 sin6->sin6_addr.s6_addr16[1] = 0; 328 sin6->sin6_scope_id = 329 ntohs(ip6->ip6_src.s6_addr16[1]); 330 } 331 } 332 if (saidx->dst.sin6.sin6_len == 0) { 333 sin6 = (struct sockaddr_in6 *)&saidx->dst; 334 sin6->sin6_len = sizeof(*sin6); 335 sin6->sin6_family = AF_INET6; 336 sin6->sin6_port = IPSEC_PORT_ANY; 337 sin6->sin6_addr = ip6->ip6_dst; 338 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 339 /* fix scope id for comparing SPD */ 340 sin6->sin6_addr.s6_addr16[1] = 0; 341 sin6->sin6_scope_id = 342 ntohs(ip6->ip6_dst.s6_addr16[1]); 343 } 344 } 345 } 346 } 347 348 /* 349 * Lookup SA and validate it. 350 */ 351 *error = key_checkrequest(isr, saidx); 352 if (*error != 0) { 353 /* 354 * IPsec processing is required, but no SA found. 355 * I assume that key_acquire() had been called 356 * to get/establish the SA. Here I discard 357 * this packet because it is responsibility for 358 * upper layer to retransmit the packet. 359 */ 360 IPSECSTAT_INC(ips_out_nosa); 361 goto bad; 362 } 363 sav = isr->sav; 364 if (sav == NULL) { 365 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 366 ("no SA found, but required; level %u", 367 ipsec_get_reqlevel(isr))); 368 IPSECREQUEST_UNLOCK(isr); 369 isr = isr->next; 370 /* 371 * If isr is NULL, we found a 'use' policy w/o SA. 372 * Return w/o error and w/o isr so we can drop out 373 * and continue w/o IPsec processing. 374 */ 375 if (isr == NULL) 376 return isr; 377 IPSECREQUEST_LOCK(isr); 378 goto again; 379 } 380 381 /* 382 * Check system global policy controls. 383 */ 384 if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) || 385 (isr->saidx.proto == IPPROTO_AH && !V_ah_enable) || 386 (isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) { 387 DPRINTF(("%s: IPsec outbound packet dropped due" 388 " to policy (check your sysctls)\n", __func__)); 389 IPSEC_OSTAT(pdrops); 390 *error = EHOSTUNREACH; 391 goto bad; 392 } 393 394 /* 395 * Sanity check the SA contents for the caller 396 * before they invoke the xform output method. 397 */ 398 if (sav->tdb_xform == NULL) { 399 DPRINTF(("%s: no transform for SA\n", __func__)); 400 IPSEC_OSTAT(noxform); 401 *error = EHOSTUNREACH; 402 goto bad; 403 } 404 return isr; 405bad: 406 IPSEC_ASSERT(*error != 0, ("error return w/ no error code")); 407 IPSECREQUEST_UNLOCK(isr); 408 return NULL; 409#undef IPSEC_OSTAT 410} 411 412#ifdef INET 413/* 414 * IPsec output logic for IPv4. 415 */ 416int 417ipsec4_process_packet( 418 struct mbuf *m, 419 struct ipsecrequest *isr, 420 int flags, 421 int tunalready) 422{ 423 struct secasindex saidx; 424 struct secasvar *sav; 425 struct ip *ip; 426 int error, i, off; 427 428 IPSEC_ASSERT(m != NULL, ("null mbuf")); 429 IPSEC_ASSERT(isr != NULL, ("null isr")); 430 431 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 432 433 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 434 if (isr == NULL) { 435 if (error != 0) 436 goto bad; 437 return EJUSTRETURN; 438 } 439 440 sav = isr->sav; 441 442#ifdef DEV_ENC 443 encif->if_opackets++; 444 encif->if_obytes += m->m_pkthdr.len; 445 446 /* pass the mbuf to enc0 for bpf processing */ 447 ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE); 448 /* pass the mbuf to enc0 for packet filtering */ 449 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 450 goto bad; 451#endif 452 453 if (!tunalready) { 454 union sockaddr_union *dst = &sav->sah->saidx.dst; 455 int setdf; 456 457 /* 458 * Collect IP_DF state from the outer header. 459 */ 460 if (dst->sa.sa_family == AF_INET) { 461 if (m->m_len < sizeof (struct ip) && 462 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 463 error = ENOBUFS; 464 goto bad; 465 } 466 ip = mtod(m, struct ip *); 467 /* Honor system-wide control of how to handle IP_DF */ 468 switch (V_ip4_ipsec_dfbit) { 469 case 0: /* clear in outer header */ 470 case 1: /* set in outer header */ 471 setdf = V_ip4_ipsec_dfbit; 472 break; 473 default: /* propagate to outer header */ 474 setdf = ntohs(ip->ip_off & IP_DF); 475 break; 476 } 477 } else { 478 ip = NULL; /* keep compiler happy */ 479 setdf = 0; 480 } 481 /* Do the appropriate encapsulation, if necessary */ 482 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 483 dst->sa.sa_family != AF_INET || /* PF mismatch */ 484#if 0 485 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 486 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 487#endif 488 (dst->sa.sa_family == AF_INET && /* Proxy */ 489 dst->sin.sin_addr.s_addr != INADDR_ANY && 490 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 491 struct mbuf *mp; 492 493 /* Fix IPv4 header checksum and length */ 494 if (m->m_len < sizeof (struct ip) && 495 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 496 error = ENOBUFS; 497 goto bad; 498 } 499 ip = mtod(m, struct ip *); 500 if (ip->ip_v == IPVERSION) { 501 ip->ip_len = htons(m->m_pkthdr.len); 502 ip->ip_sum = 0; 503 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 504 } 505 506 /* Encapsulate the packet */ 507 error = ipip_output(m, isr, &mp, 0, 0); 508 if (mp == NULL && !error) { 509 /* Should never happen. */ 510 DPRINTF(("%s: ipip_output returns no mbuf and " 511 "no error!", __func__)); 512 error = EFAULT; 513 } 514 if (error) { 515 if (mp) { 516 /* XXX: Should never happen! */ 517 m_freem(mp); 518 } 519 m = NULL; /* ipip_output() already freed it */ 520 goto bad; 521 } 522 m = mp, mp = NULL; 523 /* 524 * ipip_output clears IP_DF in the new header. If 525 * we need to propagate IP_DF from the outer header, 526 * then we have to do it here. 527 * 528 * XXX shouldn't assume what ipip_output does. 529 */ 530 if (dst->sa.sa_family == AF_INET && setdf) { 531 if (m->m_len < sizeof (struct ip) && 532 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 533 error = ENOBUFS; 534 goto bad; 535 } 536 ip = mtod(m, struct ip *); 537 ip->ip_off = ntohs(ip->ip_off); 538 ip->ip_off |= IP_DF; 539 ip->ip_off = htons(ip->ip_off); 540 } 541 } 542 } 543 544#ifdef DEV_ENC 545 /* pass the mbuf to enc0 for bpf processing */ 546 ipsec_bpf(m, sav, sav->sah->saidx.dst.sa.sa_family, ENC_OUT|ENC_AFTER); 547 /* pass the mbuf to enc0 for packet filtering */ 548 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 549 goto bad; 550#endif 551 552 /* 553 * Dispatch to the appropriate IPsec transform logic. The 554 * packet will be returned for transmission after crypto 555 * processing, etc. are completed. For encapsulation we 556 * bypass this call because of the explicit call done above 557 * (necessary to deal with IP_DF handling for IPv4). 558 * 559 * NB: m & sav are ``passed to caller'' who's reponsible for 560 * for reclaiming their resources. 561 */ 562 if (sav->tdb_xform->xf_type != XF_IP4) { 563 union sockaddr_union *dst = &sav->sah->saidx.dst; 564 switch(dst->sa.sa_family) { 565 case AF_INET: 566 ip = mtod(m, struct ip *); 567 i = ip->ip_hl << 2; 568 off = offsetof(struct ip, ip_p); 569 break; 570#ifdef INET6 571 case AF_INET6: 572 i = sizeof(struct ip6_hdr); 573 off = offsetof(struct ip6_hdr, ip6_nxt); 574 break; 575#endif /* INET6 */ 576 default: 577 DPRINTF(("%s: unsupported protocol family %u\n", 578 __func__, dst->sa.sa_family)); 579 error = EPFNOSUPPORT; 580 IPSECSTAT_INC(ips_out_inval); 581 goto bad; 582 } 583 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 584 } else { 585 error = ipsec_process_done(m, isr); 586 } 587 IPSECREQUEST_UNLOCK(isr); 588 return error; 589bad: 590 if (isr) 591 IPSECREQUEST_UNLOCK(isr); 592 if (m) 593 m_freem(m); 594 return error; 595} 596#endif 597 598 599#ifdef INET6 600static int 601in6_sa_equal_addrwithscope(const struct sockaddr_in6 *sa, const struct in6_addr *ia) 602{ 603 struct in6_addr ia2; 604 605 memcpy(&ia2, &sa->sin6_addr, sizeof(ia2)); 606 if (IN6_IS_SCOPE_LINKLOCAL(&sa->sin6_addr)) 607 ia2.s6_addr16[1] = htons(sa->sin6_scope_id); 608 609 return IN6_ARE_ADDR_EQUAL(ia, &ia2); 610} 611 612/* 613 * IPsec output logic for IPv6. 614 */ 615int 616ipsec6_process_packet( 617 struct mbuf *m, 618 struct ipsecrequest *isr 619 ) 620{ 621 struct secasindex saidx; 622 struct secasvar *sav; 623 struct ip6_hdr *ip6; 624 int error, i, off; 625 union sockaddr_union *dst; 626 627 IPSEC_ASSERT(m != NULL, ("ipsec6_process_packet: null mbuf")); 628 IPSEC_ASSERT(isr != NULL, ("ipsec6_process_packet: null isr")); 629 630 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 631 632 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 633 if (isr == NULL) { 634 if (error != 0) 635 goto bad; 636 return EJUSTRETURN; 637 } 638 639 sav = isr->sav; 640 dst = &sav->sah->saidx.dst; 641 642#ifdef DEV_ENC 643 encif->if_opackets++; 644 encif->if_obytes += m->m_pkthdr.len; 645 646 /* pass the mbuf to enc0 for bpf processing */ 647 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE); 648 /* pass the mbuf to enc0 for packet filtering */ 649 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 650 goto bad; 651#endif /* DEV_ENC */ 652 653 ip6 = mtod(m, struct ip6_hdr *); /* XXX */ 654 655 /* Do the appropriate encapsulation, if necessary */ 656 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 657 dst->sa.sa_family != AF_INET6 || /* PF mismatch */ 658 ((dst->sa.sa_family == AF_INET6) && 659 (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) && 660 (!in6_sa_equal_addrwithscope(&dst->sin6, 661 &ip6->ip6_dst)))) { 662 struct mbuf *mp; 663 664 /* Fix IPv6 header payload length. */ 665 if (m->m_len < sizeof(struct ip6_hdr)) 666 if ((m = m_pullup(m,sizeof(struct ip6_hdr))) == NULL) { 667 error = ENOBUFS; 668 goto bad; 669 } 670 671 if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) { 672 /* No jumbogram support. */ 673 error = ENXIO; /*XXX*/ 674 goto bad; 675 } 676 677 ip6 = mtod(m, struct ip6_hdr *); 678 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6)); 679 680 /* Encapsulate the packet */ 681 error = ipip_output(m, isr, &mp, 0, 0); 682 if (mp == NULL && !error) { 683 /* Should never happen. */ 684 DPRINTF(("ipsec6_process_packet: ipip_output " 685 "returns no mbuf and no error!")); 686 error = EFAULT; 687 goto bad; 688 } 689 690 if (error) { 691 if (mp) { 692 /* XXX: Should never happen! */ 693 m_freem(mp); 694 } 695 m = NULL; /* ipip_output() already freed it */ 696 goto bad; 697 } 698 699 m = mp; 700 mp = NULL; 701 } 702 703#ifdef DEV_ENC 704 ipsec_bpf(m, isr->sav, dst->sa.sa_family, ENC_OUT|ENC_AFTER); 705 /* pass the mbuf to enc0 for packet filtering */ 706 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 707 goto bad; 708#endif /* DEV_ENC */ 709 710 switch(dst->sa.sa_family) { 711#ifdef INET 712 case AF_INET: 713 { 714 struct ip *ip; 715 ip = mtod(m, struct ip *); 716 i = ip->ip_hl << 2; 717 off = offsetof(struct ip, ip_p); 718 } 719 break; 720#endif /* AF_INET */ 721 case AF_INET6: 722 i = sizeof(struct ip6_hdr); 723 off = offsetof(struct ip6_hdr, ip6_nxt); 724 break; 725 default: 726 DPRINTF(("%s: unsupported protocol family %u\n", 727 __func__, dst->sa.sa_family)); 728 error = EPFNOSUPPORT; 729 IPSEC6STAT_INC(ips_out_inval); 730 goto bad; 731 } 732 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 733 IPSECREQUEST_UNLOCK(isr); 734 return error; 735bad: 736 737 if (isr) 738 IPSECREQUEST_UNLOCK(isr); 739 if (m) 740 m_freem(m); 741 return error; 742} 743#endif /*INET6*/ 744