Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netipsec/ipsec_output.c
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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/pfil.h> 48 #include <net/vnet.h> 49 50 #include <netinet/in.h> 51 #include <netinet/in_systm.h> 52 #include <netinet/ip.h> 53 #include <netinet/ip_var.h> 54 #include <netinet/in_var.h> 55 #include <netinet/ip_ecn.h> 56 #ifdef INET6 57 #include <netinet6/ip6_ecn.h> 58 #endif 59 60 #include <netinet/ip6.h> 61 #ifdef INET6 62 #include <netinet6/ip6_var.h> 63 #endif 64 #include <netinet/in_pcb.h> 65 #ifdef INET6 66 #include <netinet/icmp6.h> 67 #endif 68 69 #include <netipsec/ipsec.h> 70 #ifdef INET6 71 #include <netipsec/ipsec6.h> 72 #endif 73 #include <netipsec/ah_var.h> 74 #include <netipsec/esp_var.h> 75 #include <netipsec/ipcomp_var.h> 76 77 #include <netipsec/xform.h> 78 79 #include <netipsec/key.h> 80 #include <netipsec/keydb.h> 81 #include <netipsec/key_debug.h> 82 83 #include <machine/in_cksum.h> 84 85 #ifdef IPSEC_NAT_T 86 #include <netinet/udp.h> 87 #endif 88 89 #ifdef DEV_ENC 90 #include <net/if_enc.h> 91 #endif 92 93 94 int 95 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 96 { 97 struct tdb_ident *tdbi; 98 struct m_tag *mtag; 99 struct secasvar *sav; 100 struct secasindex *saidx; 101 int error; 102 103 IPSEC_ASSERT(m != NULL, ("null mbuf")); 104 IPSEC_ASSERT(isr != NULL, ("null ISR")); 105 sav = isr->sav; 106 IPSEC_ASSERT(sav != NULL, ("null SA")); 107 IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 108 109 saidx = &sav->sah->saidx; 110 switch (saidx->dst.sa.sa_family) { 111 #ifdef INET 112 case AF_INET: 113 /* Fix the header length, for AH processing. */ 114 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 115 break; 116 #endif /* INET */ 117 #ifdef INET6 118 case AF_INET6: 119 /* Fix the header length, for AH processing. */ 120 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 121 error = ENXIO; 122 goto bad; 123 } 124 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 125 /* No jumbogram support. */ 126 error = ENXIO; /*?*/ 127 goto bad; 128 } 129 mtod(m, struct ip6_hdr *)->ip6_plen = 130 htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 131 break; 132 #endif /* INET6 */ 133 default: 134 DPRINTF(("%s: unknown protocol family %u\n", __func__, 135 saidx->dst.sa.sa_family)); 136 error = ENXIO; 137 goto bad; 138 } 139 140 /* 141 * Add a record of what we've done or what needs to be done to the 142 * packet. 143 */ 144 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 145 sizeof(struct tdb_ident), M_NOWAIT); 146 if (mtag == NULL) { 147 DPRINTF(("%s: could not get packet tag\n", __func__)); 148 error = ENOMEM; 149 goto bad; 150 } 151 152 tdbi = (struct tdb_ident *)(mtag + 1); 153 tdbi->dst = saidx->dst; 154 tdbi->proto = saidx->proto; 155 tdbi->spi = sav->spi; 156 m_tag_prepend(m, mtag); 157 158 /* 159 * If there's another (bundled) SA to apply, do so. 160 * Note that this puts a burden on the kernel stack size. 161 * If this is a problem we'll need to introduce a queue 162 * to set the packet on so we can unwind the stack before 163 * doing further processing. 164 */ 165 if (isr->next) { 166 /* XXX-BZ currently only support same AF bundles. */ 167 switch (saidx->dst.sa.sa_family) { 168 #ifdef INET 169 case AF_INET: 170 IPSECSTAT_INC(ips_out_bundlesa); 171 return ipsec4_process_packet(m, isr->next, 0, 0); 172 /* NOTREACHED */ 173 #endif 174 #ifdef notyet 175 #ifdef INET6 176 case AF_INET6: 177 /* XXX */ 178 IPSEC6STAT_INC(ips_out_bundlesa); 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"); 260 bad: 261 m_freem(m); 262 return (error); 263 } 264 265 static struct ipsecrequest * 266 ipsec_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)); 288 again: 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 switch(af) { 361 case AF_INET: 362 IPSECSTAT_INC(ips_out_nosa); 363 break; 364 #ifdef INET6 365 case AF_INET6: 366 IPSEC6STAT_INC(ips_out_nosa); 367 break; 368 #endif 369 } 370 goto bad; 371 } 372 sav = isr->sav; 373 if (sav == NULL) { 374 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 375 ("no SA found, but required; level %u", 376 ipsec_get_reqlevel(isr))); 377 IPSECREQUEST_UNLOCK(isr); 378 isr = isr->next; 379 /* 380 * If isr is NULL, we found a 'use' policy w/o SA. 381 * Return w/o error and w/o isr so we can drop out 382 * and continue w/o IPsec processing. 383 */ 384 if (isr == NULL) 385 return isr; 386 IPSECREQUEST_LOCK(isr); 387 goto again; 388 } 389 390 /* 391 * Check system global policy controls. 392 */ 393 if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) || 394 (isr->saidx.proto == IPPROTO_AH && !V_ah_enable) || 395 (isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) { 396 DPRINTF(("%s: IPsec outbound packet dropped due" 397 " to policy (check your sysctls)\n", __func__)); 398 IPSEC_OSTAT(pdrops); 399 *error = EHOSTUNREACH; 400 goto bad; 401 } 402 403 /* 404 * Sanity check the SA contents for the caller 405 * before they invoke the xform output method. 406 */ 407 if (sav->tdb_xform == NULL) { 408 DPRINTF(("%s: no transform for SA\n", __func__)); 409 IPSEC_OSTAT(noxform); 410 *error = EHOSTUNREACH; 411 goto bad; 412 } 413 return isr; 414 bad: 415 IPSEC_ASSERT(*error != 0, ("error return w/ no error code")); 416 IPSECREQUEST_UNLOCK(isr); 417 return NULL; 418 #undef IPSEC_OSTAT 419 } 420 421 #ifdef INET 422 /* 423 * IPsec output logic for IPv4. 424 */ 425 int 426 ipsec4_process_packet( 427 struct mbuf *m, 428 struct ipsecrequest *isr, 429 int flags, 430 int tunalready) 431 { 432 struct secasindex saidx; 433 struct secasvar *sav; 434 struct ip *ip; 435 int error, i, off; 436 437 IPSEC_ASSERT(m != NULL, ("null mbuf")); 438 IPSEC_ASSERT(isr != NULL, ("null isr")); 439 440 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 441 442 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 443 if (isr == NULL) { 444 if (error != 0) 445 goto bad; 446 return EJUSTRETURN; 447 } 448 449 sav = isr->sav; 450 451 #ifdef DEV_ENC 452 encif->if_opackets++; 453 encif->if_obytes += m->m_pkthdr.len; 454 455 /* pass the mbuf to enc0 for bpf processing */ 456 ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE); 457 /* pass the mbuf to enc0 for packet filtering */ 458 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 459 goto bad; 460 #endif 461 462 if (!tunalready) { 463 union sockaddr_union *dst = &sav->sah->saidx.dst; 464 int setdf; 465 466 /* 467 * Collect IP_DF state from the outer header. 468 */ 469 if (dst->sa.sa_family == AF_INET) { 470 if (m->m_len < sizeof (struct ip) && 471 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 472 error = ENOBUFS; 473 goto bad; 474 } 475 ip = mtod(m, struct ip *); 476 /* Honor system-wide control of how to handle IP_DF */ 477 switch (V_ip4_ipsec_dfbit) { 478 case 0: /* clear in outer header */ 479 case 1: /* set in outer header */ 480 setdf = V_ip4_ipsec_dfbit; 481 break; 482 default: /* propagate to outer header */ 483 setdf = ntohs(ip->ip_off & IP_DF); 484 break; 485 } 486 } else { 487 ip = NULL; /* keep compiler happy */ 488 setdf = 0; 489 } 490 /* Do the appropriate encapsulation, if necessary */ 491 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 492 dst->sa.sa_family != AF_INET || /* PF mismatch */ 493 #if 0 494 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 495 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 496 #endif 497 (dst->sa.sa_family == AF_INET && /* Proxy */ 498 dst->sin.sin_addr.s_addr != INADDR_ANY && 499 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 500 struct mbuf *mp; 501 502 /* Fix IPv4 header checksum and length */ 503 if (m->m_len < sizeof (struct ip) && 504 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 505 error = ENOBUFS; 506 goto bad; 507 } 508 ip = mtod(m, struct ip *); 509 if (ip->ip_v == IPVERSION) { 510 ip->ip_len = htons(m->m_pkthdr.len); 511 ip->ip_sum = 0; 512 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 513 } 514 515 /* Encapsulate the packet */ 516 error = ipip_output(m, isr, &mp, 0, 0); 517 if (mp == NULL && !error) { 518 /* Should never happen. */ 519 DPRINTF(("%s: ipip_output returns no mbuf and " 520 "no error!", __func__)); 521 error = EFAULT; 522 } 523 if (error) { 524 if (mp) { 525 /* XXX: Should never happen! */ 526 m_freem(mp); 527 } 528 m = NULL; /* ipip_output() already freed it */ 529 goto bad; 530 } 531 m = mp, mp = NULL; 532 /* 533 * ipip_output clears IP_DF in the new header. If 534 * we need to propagate IP_DF from the outer header, 535 * then we have to do it here. 536 * 537 * XXX shouldn't assume what ipip_output does. 538 */ 539 if (dst->sa.sa_family == AF_INET && setdf) { 540 if (m->m_len < sizeof (struct ip) && 541 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 542 error = ENOBUFS; 543 goto bad; 544 } 545 ip = mtod(m, struct ip *); 546 ip->ip_off = ntohs(ip->ip_off); 547 ip->ip_off |= IP_DF; 548 ip->ip_off = htons(ip->ip_off); 549 } 550 } 551 } 552 553 #ifdef DEV_ENC 554 /* pass the mbuf to enc0 for bpf processing */ 555 ipsec_bpf(m, sav, sav->sah->saidx.dst.sa.sa_family, ENC_OUT|ENC_AFTER); 556 /* pass the mbuf to enc0 for packet filtering */ 557 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 558 goto bad; 559 #endif 560 561 /* 562 * Dispatch to the appropriate IPsec transform logic. The 563 * packet will be returned for transmission after crypto 564 * processing, etc. are completed. For encapsulation we 565 * bypass this call because of the explicit call done above 566 * (necessary to deal with IP_DF handling for IPv4). 567 * 568 * NB: m & sav are ``passed to caller'' who's reponsible for 569 * for reclaiming their resources. 570 */ 571 if (sav->tdb_xform->xf_type != XF_IP4) { 572 union sockaddr_union *dst = &sav->sah->saidx.dst; 573 switch(dst->sa.sa_family) { 574 case AF_INET: 575 ip = mtod(m, struct ip *); 576 i = ip->ip_hl << 2; 577 off = offsetof(struct ip, ip_p); 578 break; 579 #ifdef INET6 580 case AF_INET6: 581 i = sizeof(struct ip6_hdr); 582 off = offsetof(struct ip6_hdr, ip6_nxt); 583 break; 584 #endif /* INET6 */ 585 default: 586 DPRINTF(("%s: unsupported protocol family %u\n", 587 __func__, dst->sa.sa_family)); 588 error = EPFNOSUPPORT; 589 IPSECSTAT_INC(ips_out_inval); 590 goto bad; 591 } 592 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 593 } else { 594 error = ipsec_process_done(m, isr); 595 } 596 IPSECREQUEST_UNLOCK(isr); 597 return error; 598 bad: 599 if (isr) 600 IPSECREQUEST_UNLOCK(isr); 601 if (m) 602 m_freem(m); 603 return error; 604 } 605 #endif 606 607 608 #ifdef INET6 609 static int 610 in6_sa_equal_addrwithscope(const struct sockaddr_in6 *sa, const struct in6_addr *ia) 611 { 612 struct in6_addr ia2; 613 614 memcpy(&ia2, &sa->sin6_addr, sizeof(ia2)); 615 if (IN6_IS_SCOPE_LINKLOCAL(&sa->sin6_addr)) 616 ia2.s6_addr16[1] = htons(sa->sin6_scope_id); 617 618 return IN6_ARE_ADDR_EQUAL(ia, &ia2); 619 } 620 621 /* 622 * IPsec output logic for IPv6. 623 */ 624 int 625 ipsec6_process_packet( 626 struct mbuf *m, 627 struct ipsecrequest *isr 628 ) 629 { 630 struct secasindex saidx; 631 struct secasvar *sav; 632 struct ip6_hdr *ip6; 633 int error, i, off; 634 union sockaddr_union *dst; 635 636 IPSEC_ASSERT(m != NULL, ("ipsec6_process_packet: null mbuf")); 637 IPSEC_ASSERT(isr != NULL, ("ipsec6_process_packet: null isr")); 638 639 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 640 641 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 642 if (isr == NULL) { 643 if (error != 0) 644 goto bad; 645 return EJUSTRETURN; 646 } 647 648 sav = isr->sav; 649 dst = &sav->sah->saidx.dst; 650 651 ip6 = mtod(m, struct ip6_hdr *); 652 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6)); 653 #ifdef DEV_ENC 654 encif->if_opackets++; 655 encif->if_obytes += m->m_pkthdr.len; 656 657 /* pass the mbuf to enc0 for bpf processing */ 658 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE); 659 /* pass the mbuf to enc0 for packet filtering */ 660 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 661 goto bad; 662 #endif /* DEV_ENC */ 663 664 /* Do the appropriate encapsulation, if necessary */ 665 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 666 dst->sa.sa_family != AF_INET6 || /* PF mismatch */ 667 ((dst->sa.sa_family == AF_INET6) && 668 (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) && 669 (!in6_sa_equal_addrwithscope(&dst->sin6, 670 &ip6->ip6_dst)))) { 671 struct mbuf *mp; 672 673 /* Fix IPv6 header payload length. */ 674 if (m->m_len < sizeof(struct ip6_hdr)) 675 if ((m = m_pullup(m,sizeof(struct ip6_hdr))) == NULL) { 676 error = ENOBUFS; 677 goto bad; 678 } 679 680 if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) { 681 /* No jumbogram support. */ 682 error = ENXIO; /*XXX*/ 683 goto bad; 684 } 685 686 /* Encapsulate the packet */ 687 error = ipip_output(m, isr, &mp, 0, 0); 688 if (mp == NULL && !error) { 689 /* Should never happen. */ 690 DPRINTF(("ipsec6_process_packet: ipip_output " 691 "returns no mbuf and no error!")); 692 error = EFAULT; 693 goto bad; 694 } 695 696 if (error) { 697 if (mp) { 698 /* XXX: Should never happen! */ 699 m_freem(mp); 700 } 701 m = NULL; /* ipip_output() already freed it */ 702 goto bad; 703 } 704 705 m = mp; 706 mp = NULL; 707 } 708 709 #ifdef DEV_ENC 710 ipsec_bpf(m, isr->sav, dst->sa.sa_family, ENC_OUT|ENC_AFTER); 711 /* pass the mbuf to enc0 for packet filtering */ 712 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 713 goto bad; 714 #endif /* DEV_ENC */ 715 716 switch(dst->sa.sa_family) { 717 #ifdef INET 718 case AF_INET: 719 { 720 struct ip *ip; 721 ip = mtod(m, struct ip *); 722 i = ip->ip_hl << 2; 723 off = offsetof(struct ip, ip_p); 724 } 725 break; 726 #endif /* AF_INET */ 727 case AF_INET6: 728 i = sizeof(struct ip6_hdr); 729 off = offsetof(struct ip6_hdr, ip6_nxt); 730 break; 731 default: 732 DPRINTF(("%s: unsupported protocol family %u\n", 733 __func__, dst->sa.sa_family)); 734 error = EPFNOSUPPORT; 735 IPSEC6STAT_INC(ips_out_inval); 736 goto bad; 737 } 738 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 739 IPSECREQUEST_UNLOCK(isr); 740 return error; 741 bad: 742 743 if (isr) 744 IPSECREQUEST_UNLOCK(isr); 745 if (m) 746 m_freem(m); 747 return error; 748 } 749 #endif /*INET6*/
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