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/route.h> 50 #include <net/vnet.h> 51 52 #include <netinet/in.h> 53 #include <netinet/in_systm.h> 54 #include <netinet/ip.h> 55 #include <netinet/ip_var.h> 56 #include <netinet/in_var.h> 57 #include <netinet/ip_ecn.h> 58 #ifdef INET6 59 #include <netinet6/ip6_ecn.h> 60 #endif 61 62 #include <netinet/ip6.h> 63 #ifdef INET6 64 #include <netinet6/ip6_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 sav = isr->sav; 108 IPSEC_ASSERT(sav != NULL, ("null SA")); 109 IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 110 111 saidx = &sav->sah->saidx; 112 switch (saidx->dst.sa.sa_family) { 113 #ifdef INET 114 case AF_INET: 115 /* Fix the header length, for AH processing. */ 116 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 117 break; 118 #endif /* INET */ 119 #ifdef INET6 120 case AF_INET6: 121 /* Fix the header length, for AH processing. */ 122 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 123 error = ENXIO; 124 goto bad; 125 } 126 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 127 /* No jumbogram support. */ 128 error = ENXIO; /*?*/ 129 goto bad; 130 } 131 mtod(m, struct ip6_hdr *)->ip6_plen = 132 htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 133 break; 134 #endif /* INET6 */ 135 default: 136 DPRINTF(("%s: unknown protocol family %u\n", __func__, 137 saidx->dst.sa.sa_family)); 138 error = ENXIO; 139 goto bad; 140 } 141 142 /* 143 * Add a record of what we've done or what needs to be done to the 144 * packet. 145 */ 146 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 147 sizeof(struct tdb_ident), M_NOWAIT); 148 if (mtag == NULL) { 149 DPRINTF(("%s: could not get packet tag\n", __func__)); 150 error = ENOMEM; 151 goto bad; 152 } 153 154 tdbi = (struct tdb_ident *)(mtag + 1); 155 tdbi->dst = saidx->dst; 156 tdbi->proto = saidx->proto; 157 tdbi->spi = sav->spi; 158 m_tag_prepend(m, mtag); 159 160 /* 161 * If there's another (bundled) SA to apply, do so. 162 * Note that this puts a burden on the kernel stack size. 163 * If this is a problem we'll need to introduce a queue 164 * to set the packet on so we can unwind the stack before 165 * doing further processing. 166 */ 167 if (isr->next) { 168 IPSECSTAT_INC(ips_out_bundlesa); 169 /* XXX-BZ currently only support same AF bundles. */ 170 switch (saidx->dst.sa.sa_family) { 171 #ifdef INET 172 case AF_INET: 173 return ipsec4_process_packet(m, isr->next, 0, 0); 174 /* NOTREACHED */ 175 #endif 176 #ifdef notyet 177 #ifdef INET6 178 case AF_INET6: 179 /* XXX */ 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"); 261 bad: 262 m_freem(m); 263 return (error); 264 } 265 266 static struct ipsecrequest * 267 ipsec_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)); 289 again: 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 IPSECSTAT_INC(ips_out_nosa); 362 goto bad; 363 } 364 sav = isr->sav; 365 if (sav == NULL) { 366 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 367 ("no SA found, but required; level %u", 368 ipsec_get_reqlevel(isr))); 369 IPSECREQUEST_UNLOCK(isr); 370 isr = isr->next; 371 /* 372 * If isr is NULL, we found a 'use' policy w/o SA. 373 * Return w/o error and w/o isr so we can drop out 374 * and continue w/o IPsec processing. 375 */ 376 if (isr == NULL) 377 return isr; 378 IPSECREQUEST_LOCK(isr); 379 goto again; 380 } 381 382 /* 383 * Check system global policy controls. 384 */ 385 if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) || 386 (isr->saidx.proto == IPPROTO_AH && !V_ah_enable) || 387 (isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) { 388 DPRINTF(("%s: IPsec outbound packet dropped due" 389 " to policy (check your sysctls)\n", __func__)); 390 IPSEC_OSTAT(pdrops); 391 *error = EHOSTUNREACH; 392 goto bad; 393 } 394 395 /* 396 * Sanity check the SA contents for the caller 397 * before they invoke the xform output method. 398 */ 399 if (sav->tdb_xform == NULL) { 400 DPRINTF(("%s: no transform for SA\n", __func__)); 401 IPSEC_OSTAT(noxform); 402 *error = EHOSTUNREACH; 403 goto bad; 404 } 405 return isr; 406 bad: 407 IPSEC_ASSERT(*error != 0, ("error return w/ no error code")); 408 IPSECREQUEST_UNLOCK(isr); 409 return NULL; 410 #undef IPSEC_OSTAT 411 } 412 413 #ifdef INET 414 /* 415 * IPsec output logic for IPv4. 416 */ 417 int 418 ipsec4_process_packet( 419 struct mbuf *m, 420 struct ipsecrequest *isr, 421 int flags, 422 int tunalready) 423 { 424 struct secasindex saidx; 425 struct secasvar *sav; 426 struct ip *ip; 427 int error, i, off; 428 429 IPSEC_ASSERT(m != NULL, ("null mbuf")); 430 IPSEC_ASSERT(isr != NULL, ("null isr")); 431 432 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 433 434 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 435 if (isr == NULL) { 436 if (error != 0) 437 goto bad; 438 return EJUSTRETURN; 439 } 440 441 sav = isr->sav; 442 443 #ifdef DEV_ENC 444 if_inc_counter(encif, IFCOUNTER_OPACKETS, 1); 445 if_inc_counter(encif, IFCOUNTER_OBYTES, m->m_pkthdr.len); 446 447 /* pass the mbuf to enc0 for bpf processing */ 448 ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE); 449 /* pass the mbuf to enc0 for packet filtering */ 450 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 451 goto bad; 452 #endif 453 454 if (!tunalready) { 455 union sockaddr_union *dst = &sav->sah->saidx.dst; 456 int setdf; 457 458 /* 459 * Collect IP_DF state from the outer header. 460 */ 461 if (dst->sa.sa_family == AF_INET) { 462 if (m->m_len < sizeof (struct ip) && 463 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 464 error = ENOBUFS; 465 goto bad; 466 } 467 ip = mtod(m, struct ip *); 468 /* Honor system-wide control of how to handle IP_DF */ 469 switch (V_ip4_ipsec_dfbit) { 470 case 0: /* clear in outer header */ 471 case 1: /* set in outer header */ 472 setdf = V_ip4_ipsec_dfbit; 473 break; 474 default: /* propagate to outer header */ 475 setdf = ntohs(ip->ip_off & IP_DF); 476 break; 477 } 478 } else { 479 ip = NULL; /* keep compiler happy */ 480 setdf = 0; 481 } 482 /* Do the appropriate encapsulation, if necessary */ 483 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 484 dst->sa.sa_family != AF_INET || /* PF mismatch */ 485 #if 0 486 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 487 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 488 #endif 489 (dst->sa.sa_family == AF_INET && /* Proxy */ 490 dst->sin.sin_addr.s_addr != INADDR_ANY && 491 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 492 struct mbuf *mp; 493 494 /* Fix IPv4 header checksum and length */ 495 if (m->m_len < sizeof (struct ip) && 496 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 497 error = ENOBUFS; 498 goto bad; 499 } 500 ip = mtod(m, struct ip *); 501 if (ip->ip_v == IPVERSION) { 502 ip->ip_len = htons(m->m_pkthdr.len); 503 ip->ip_sum = 0; 504 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 505 } 506 507 /* Encapsulate the packet */ 508 error = ipip_output(m, isr, &mp, 0, 0); 509 if (mp == NULL && !error) { 510 /* Should never happen. */ 511 DPRINTF(("%s: ipip_output returns no mbuf and " 512 "no error!", __func__)); 513 error = EFAULT; 514 } 515 if (error) { 516 if (mp) { 517 /* XXX: Should never happen! */ 518 m_freem(mp); 519 } 520 m = NULL; /* ipip_output() already freed it */ 521 goto bad; 522 } 523 m = mp, mp = NULL; 524 /* 525 * ipip_output clears IP_DF in the new header. If 526 * we need to propagate IP_DF from the outer header, 527 * then we have to do it here. 528 * 529 * XXX shouldn't assume what ipip_output does. 530 */ 531 if (dst->sa.sa_family == AF_INET && setdf) { 532 if (m->m_len < sizeof (struct ip) && 533 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 534 error = ENOBUFS; 535 goto bad; 536 } 537 ip = mtod(m, struct ip *); 538 ip->ip_off = ntohs(ip->ip_off); 539 ip->ip_off |= IP_DF; 540 ip->ip_off = htons(ip->ip_off); 541 } 542 } 543 } 544 545 #ifdef DEV_ENC 546 /* pass the mbuf to enc0 for bpf processing */ 547 ipsec_bpf(m, sav, sav->sah->saidx.dst.sa.sa_family, ENC_OUT|ENC_AFTER); 548 /* pass the mbuf to enc0 for packet filtering */ 549 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 550 goto bad; 551 #endif 552 553 /* 554 * Dispatch to the appropriate IPsec transform logic. The 555 * packet will be returned for transmission after crypto 556 * processing, etc. are completed. For encapsulation we 557 * bypass this call because of the explicit call done above 558 * (necessary to deal with IP_DF handling for IPv4). 559 * 560 * NB: m & sav are ``passed to caller'' who's reponsible for 561 * for reclaiming their resources. 562 */ 563 if (sav->tdb_xform->xf_type != XF_IP4) { 564 union sockaddr_union *dst = &sav->sah->saidx.dst; 565 switch(dst->sa.sa_family) { 566 case AF_INET: 567 ip = mtod(m, struct ip *); 568 i = ip->ip_hl << 2; 569 off = offsetof(struct ip, ip_p); 570 break; 571 #ifdef INET6 572 case AF_INET6: 573 i = sizeof(struct ip6_hdr); 574 off = offsetof(struct ip6_hdr, ip6_nxt); 575 break; 576 #endif /* INET6 */ 577 default: 578 DPRINTF(("%s: unsupported protocol family %u\n", 579 __func__, dst->sa.sa_family)); 580 error = EPFNOSUPPORT; 581 IPSECSTAT_INC(ips_out_inval); 582 goto bad; 583 } 584 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 585 } else { 586 error = ipsec_process_done(m, isr); 587 } 588 IPSECREQUEST_UNLOCK(isr); 589 return error; 590 bad: 591 if (isr) 592 IPSECREQUEST_UNLOCK(isr); 593 if (m) 594 m_freem(m); 595 return error; 596 } 597 #endif 598 599 600 #ifdef INET6 601 static int 602 in6_sa_equal_addrwithscope(const struct sockaddr_in6 *sa, const struct in6_addr *ia) 603 { 604 struct in6_addr ia2; 605 606 memcpy(&ia2, &sa->sin6_addr, sizeof(ia2)); 607 if (IN6_IS_SCOPE_LINKLOCAL(&sa->sin6_addr)) 608 ia2.s6_addr16[1] = htons(sa->sin6_scope_id); 609 610 return IN6_ARE_ADDR_EQUAL(ia, &ia2); 611 } 612 613 /* 614 * IPsec output logic for IPv6. 615 */ 616 int 617 ipsec6_process_packet( 618 struct mbuf *m, 619 struct ipsecrequest *isr 620 ) 621 { 622 struct secasindex saidx; 623 struct secasvar *sav; 624 struct ip6_hdr *ip6; 625 int error, i, off; 626 union sockaddr_union *dst; 627 628 IPSEC_ASSERT(m != NULL, ("ipsec6_process_packet: null mbuf")); 629 IPSEC_ASSERT(isr != NULL, ("ipsec6_process_packet: null isr")); 630 631 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 632 633 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 634 if (isr == NULL) { 635 if (error != 0) 636 goto bad; 637 return EJUSTRETURN; 638 } 639 640 sav = isr->sav; 641 dst = &sav->sah->saidx.dst; 642 643 #ifdef DEV_ENC 644 if_inc_counter(encif, IFCOUNTER_OPACKETS, 1); 645 if_inc_counter(encif, IFCOUNTER_OBYTES, m->m_pkthdr.len); 646 647 /* pass the mbuf to enc0 for bpf processing */ 648 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE); 649 /* pass the mbuf to enc0 for packet filtering */ 650 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 651 goto bad; 652 #endif /* DEV_ENC */ 653 654 ip6 = mtod(m, struct ip6_hdr *); /* XXX */ 655 656 /* Do the appropriate encapsulation, if necessary */ 657 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 658 dst->sa.sa_family != AF_INET6 || /* PF mismatch */ 659 ((dst->sa.sa_family == AF_INET6) && 660 (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) && 661 (!in6_sa_equal_addrwithscope(&dst->sin6, 662 &ip6->ip6_dst)))) { 663 struct mbuf *mp; 664 665 /* Fix IPv6 header payload length. */ 666 if (m->m_len < sizeof(struct ip6_hdr)) 667 if ((m = m_pullup(m,sizeof(struct ip6_hdr))) == NULL) { 668 error = ENOBUFS; 669 goto bad; 670 } 671 672 if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) { 673 /* No jumbogram support. */ 674 error = ENXIO; /*XXX*/ 675 goto bad; 676 } 677 678 ip6 = mtod(m, struct ip6_hdr *); 679 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6)); 680 681 /* Encapsulate the packet */ 682 error = ipip_output(m, isr, &mp, 0, 0); 683 if (mp == NULL && !error) { 684 /* Should never happen. */ 685 DPRINTF(("ipsec6_process_packet: ipip_output " 686 "returns no mbuf and no error!")); 687 error = EFAULT; 688 goto bad; 689 } 690 691 if (error) { 692 if (mp) { 693 /* XXX: Should never happen! */ 694 m_freem(mp); 695 } 696 m = NULL; /* ipip_output() already freed it */ 697 goto bad; 698 } 699 700 m = mp; 701 mp = NULL; 702 } 703 704 #ifdef DEV_ENC 705 ipsec_bpf(m, isr->sav, dst->sa.sa_family, ENC_OUT|ENC_AFTER); 706 /* pass the mbuf to enc0 for packet filtering */ 707 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 708 goto bad; 709 #endif /* DEV_ENC */ 710 711 switch(dst->sa.sa_family) { 712 #ifdef INET 713 case AF_INET: 714 { 715 struct ip *ip; 716 ip = mtod(m, struct ip *); 717 i = ip->ip_hl << 2; 718 off = offsetof(struct ip, ip_p); 719 } 720 break; 721 #endif /* AF_INET */ 722 case AF_INET6: 723 i = sizeof(struct ip6_hdr); 724 off = offsetof(struct ip6_hdr, ip6_nxt); 725 break; 726 default: 727 DPRINTF(("%s: unsupported protocol family %u\n", 728 __func__, dst->sa.sa_family)); 729 error = EPFNOSUPPORT; 730 IPSEC6STAT_INC(ips_out_inval); 731 goto bad; 732 } 733 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 734 IPSECREQUEST_UNLOCK(isr); 735 return error; 736 bad: 737 738 if (isr) 739 IPSECREQUEST_UNLOCK(isr); 740 if (m) 741 m_freem(m); 742 return error; 743 } 744 #endif /*INET6*/ 745