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 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/mbuf.h> 39 #include <sys/domain.h> 40 #include <sys/protosw.h> 41 #include <sys/socket.h> 42 #include <sys/errno.h> 43 #include <sys/syslog.h> 44 45 #include <net/if.h> 46 #include <net/route.h> 47 48 #include <netinet/in.h> 49 #include <netinet/in_systm.h> 50 #include <netinet/ip.h> 51 #include <netinet/ip_var.h> 52 #include <netinet/in_var.h> 53 #include <netinet/ip_ecn.h> 54 #ifdef INET6 55 #include <netinet6/ip6_ecn.h> 56 #endif 57 58 #include <netinet/ip6.h> 59 #ifdef INET6 60 #include <netinet6/ip6_var.h> 61 #endif 62 #include <netinet/in_pcb.h> 63 #ifdef INET6 64 #include <netinet/icmp6.h> 65 #endif 66 67 #include <netipsec/ipsec.h> 68 #ifdef INET6 69 #include <netipsec/ipsec6.h> 70 #endif 71 #include <netipsec/ah_var.h> 72 #include <netipsec/esp_var.h> 73 #include <netipsec/ipcomp_var.h> 74 75 #include <netipsec/xform.h> 76 77 #include <netipsec/key.h> 78 #include <netipsec/keydb.h> 79 #include <netipsec/key_debug.h> 80 81 #include <machine/in_cksum.h> 82 83 int 84 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 85 { 86 struct tdb_ident *tdbi; 87 struct m_tag *mtag; 88 struct secasvar *sav; 89 struct secasindex *saidx; 90 int error; 91 92 IPSEC_SPLASSERT_SOFTNET(__func__); 93 94 IPSEC_ASSERT(m != NULL, ("null mbuf")); 95 IPSEC_ASSERT(isr != NULL, ("null ISR")); 96 sav = isr->sav; 97 IPSEC_ASSERT(sav != NULL, ("null SA")); 98 IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 99 100 saidx = &sav->sah->saidx; 101 switch (saidx->dst.sa.sa_family) { 102 #ifdef INET 103 case AF_INET: 104 /* Fix the header length, for AH processing. */ 105 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 106 break; 107 #endif /* INET */ 108 #ifdef INET6 109 case AF_INET6: 110 /* Fix the header length, for AH processing. */ 111 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 112 error = ENXIO; 113 goto bad; 114 } 115 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 116 /* No jumbogram support. */ 117 error = ENXIO; /*?*/ 118 goto bad; 119 } 120 mtod(m, struct ip6_hdr *)->ip6_plen = 121 htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 122 break; 123 #endif /* INET6 */ 124 default: 125 DPRINTF(("%s: unknown protocol family %u\n", __func__, 126 saidx->dst.sa.sa_family)); 127 error = ENXIO; 128 goto bad; 129 } 130 131 /* 132 * Add a record of what we've done or what needs to be done to the 133 * packet. 134 */ 135 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 136 sizeof(struct tdb_ident), M_NOWAIT); 137 if (mtag == NULL) { 138 DPRINTF(("%s: could not get packet tag\n", __func__)); 139 error = ENOMEM; 140 goto bad; 141 } 142 143 tdbi = (struct tdb_ident *)(mtag + 1); 144 tdbi->dst = saidx->dst; 145 tdbi->proto = saidx->proto; 146 tdbi->spi = sav->spi; 147 m_tag_prepend(m, mtag); 148 149 /* 150 * If there's another (bundled) SA to apply, do so. 151 * Note that this puts a burden on the kernel stack size. 152 * If this is a problem we'll need to introduce a queue 153 * to set the packet on so we can unwind the stack before 154 * doing further processing. 155 */ 156 if (isr->next) { 157 newipsecstat.ips_out_bundlesa++; 158 return ipsec4_process_packet(m, isr->next, 0, 0); 159 } 160 key_sa_recordxfer(sav, m); /* record data transfer */ 161 162 /* 163 * We're done with IPsec processing, transmit the packet using the 164 * appropriate network protocol (IP or IPv6). SPD lookup will be 165 * performed again there. 166 */ 167 switch (saidx->dst.sa.sa_family) { 168 #ifdef INET 169 struct ip *ip; 170 case AF_INET: 171 ip = mtod(m, struct ip *); 172 ip->ip_len = ntohs(ip->ip_len); 173 ip->ip_off = ntohs(ip->ip_off); 174 175 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL); 176 #endif /* INET */ 177 #ifdef INET6 178 case AF_INET6: 179 /* 180 * We don't need massage, IPv6 header fields are always in 181 * net endian. 182 */ 183 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 184 #endif /* INET6 */ 185 } 186 panic("ipsec_process_done"); 187 bad: 188 m_freem(m); 189 KEY_FREESAV(&sav); 190 return (error); 191 } 192 193 static struct ipsecrequest * 194 ipsec_nextisr( 195 struct mbuf *m, 196 struct ipsecrequest *isr, 197 int af, 198 struct secasindex *saidx, 199 int *error 200 ) 201 { 202 #define IPSEC_OSTAT(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \ 203 isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++) 204 struct secasvar *sav; 205 206 IPSEC_SPLASSERT_SOFTNET(__func__); 207 IPSECREQUEST_LOCK_ASSERT(isr); 208 209 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 210 ("invalid address family %u", af)); 211 again: 212 /* 213 * Craft SA index to search for proper SA. Note that 214 * we only fillin unspecified SA peers for transport 215 * mode; for tunnel mode they must already be filled in. 216 */ 217 *saidx = isr->saidx; 218 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 219 /* Fillin unspecified SA peers only for transport mode */ 220 if (af == AF_INET) { 221 struct sockaddr_in *sin; 222 struct ip *ip = mtod(m, struct ip *); 223 224 if (saidx->src.sa.sa_len == 0) { 225 sin = &saidx->src.sin; 226 sin->sin_len = sizeof(*sin); 227 sin->sin_family = AF_INET; 228 sin->sin_port = IPSEC_PORT_ANY; 229 sin->sin_addr = ip->ip_src; 230 } 231 if (saidx->dst.sa.sa_len == 0) { 232 sin = &saidx->dst.sin; 233 sin->sin_len = sizeof(*sin); 234 sin->sin_family = AF_INET; 235 sin->sin_port = IPSEC_PORT_ANY; 236 sin->sin_addr = ip->ip_dst; 237 } 238 } else { 239 struct sockaddr_in6 *sin6; 240 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 241 242 if (saidx->src.sin6.sin6_len == 0) { 243 sin6 = (struct sockaddr_in6 *)&saidx->src; 244 sin6->sin6_len = sizeof(*sin6); 245 sin6->sin6_family = AF_INET6; 246 sin6->sin6_port = IPSEC_PORT_ANY; 247 sin6->sin6_addr = ip6->ip6_src; 248 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 249 /* fix scope id for comparing SPD */ 250 sin6->sin6_addr.s6_addr16[1] = 0; 251 sin6->sin6_scope_id = 252 ntohs(ip6->ip6_src.s6_addr16[1]); 253 } 254 } 255 if (saidx->dst.sin6.sin6_len == 0) { 256 sin6 = (struct sockaddr_in6 *)&saidx->dst; 257 sin6->sin6_len = sizeof(*sin6); 258 sin6->sin6_family = AF_INET6; 259 sin6->sin6_port = IPSEC_PORT_ANY; 260 sin6->sin6_addr = ip6->ip6_dst; 261 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 262 /* fix scope id for comparing SPD */ 263 sin6->sin6_addr.s6_addr16[1] = 0; 264 sin6->sin6_scope_id = 265 ntohs(ip6->ip6_dst.s6_addr16[1]); 266 } 267 } 268 } 269 } 270 271 /* 272 * Lookup SA and validate it. 273 */ 274 *error = key_checkrequest(isr, saidx); 275 if (*error != 0) { 276 /* 277 * IPsec processing is required, but no SA found. 278 * I assume that key_acquire() had been called 279 * to get/establish the SA. Here I discard 280 * this packet because it is responsibility for 281 * upper layer to retransmit the packet. 282 */ 283 newipsecstat.ips_out_nosa++; 284 goto bad; 285 } 286 sav = isr->sav; 287 if (sav == NULL) { /* XXX valid return */ 288 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 289 ("no SA found, but required; level %u", 290 ipsec_get_reqlevel(isr))); 291 IPSECREQUEST_UNLOCK(isr); 292 isr = isr->next; 293 if (isr == NULL) { 294 /*XXXstatistic??*/ 295 *error = EINVAL; /*XXX*/ 296 return isr; 297 } 298 IPSECREQUEST_LOCK(isr); 299 goto again; 300 } 301 302 /* 303 * Check system global policy controls. 304 */ 305 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) || 306 (isr->saidx.proto == IPPROTO_AH && !ah_enable) || 307 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) { 308 DPRINTF(("%s: IPsec outbound packet dropped due" 309 " to policy (check your sysctls)\n", __func__)); 310 IPSEC_OSTAT(espstat.esps_pdrops, ahstat.ahs_pdrops, 311 ipcompstat.ipcomps_pdrops); 312 *error = EHOSTUNREACH; 313 goto bad; 314 } 315 316 /* 317 * Sanity check the SA contents for the caller 318 * before they invoke the xform output method. 319 */ 320 if (sav->tdb_xform == NULL) { 321 DPRINTF(("%s: no transform for SA\n", __func__)); 322 IPSEC_OSTAT(espstat.esps_noxform, ahstat.ahs_noxform, 323 ipcompstat.ipcomps_noxform); 324 *error = EHOSTUNREACH; 325 goto bad; 326 } 327 return isr; 328 bad: 329 IPSEC_ASSERT(*error != 0, ("error return w/ no error code")); 330 IPSECREQUEST_UNLOCK(isr); 331 return NULL; 332 #undef IPSEC_OSTAT 333 } 334 335 #ifdef INET 336 /* 337 * IPsec output logic for IPv4. 338 */ 339 int 340 ipsec4_process_packet( 341 struct mbuf *m, 342 struct ipsecrequest *isr, 343 int flags, 344 int tunalready) 345 { 346 struct secasindex saidx; 347 struct secasvar *sav; 348 struct ip *ip; 349 int error, i, off; 350 351 IPSEC_ASSERT(m != NULL, ("null mbuf")); 352 IPSEC_ASSERT(isr != NULL, ("null isr")); 353 354 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 355 356 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 357 if (isr == NULL) 358 goto bad; 359 360 sav = isr->sav; 361 if (!tunalready) { 362 union sockaddr_union *dst = &sav->sah->saidx.dst; 363 int setdf; 364 365 /* 366 * Collect IP_DF state from the outer header. 367 */ 368 if (dst->sa.sa_family == AF_INET) { 369 if (m->m_len < sizeof (struct ip) && 370 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 371 error = ENOBUFS; 372 goto bad; 373 } 374 ip = mtod(m, struct ip *); 375 /* Honor system-wide control of how to handle IP_DF */ 376 switch (ip4_ipsec_dfbit) { 377 case 0: /* clear in outer header */ 378 case 1: /* set in outer header */ 379 setdf = ip4_ipsec_dfbit; 380 break; 381 default: /* propagate to outer header */ 382 setdf = ntohs(ip->ip_off & IP_DF); 383 break; 384 } 385 } else { 386 ip = NULL; /* keep compiler happy */ 387 setdf = 0; 388 } 389 /* Do the appropriate encapsulation, if necessary */ 390 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 391 dst->sa.sa_family != AF_INET || /* PF mismatch */ 392 #if 0 393 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 394 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 395 #endif 396 (dst->sa.sa_family == AF_INET && /* Proxy */ 397 dst->sin.sin_addr.s_addr != INADDR_ANY && 398 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 399 struct mbuf *mp; 400 401 /* Fix IPv4 header checksum and length */ 402 if (m->m_len < sizeof (struct ip) && 403 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 404 error = ENOBUFS; 405 goto bad; 406 } 407 ip = mtod(m, struct ip *); 408 ip->ip_len = htons(m->m_pkthdr.len); 409 ip->ip_sum = 0; 410 #ifdef _IP_VHL 411 if (ip->ip_vhl == IP_VHL_BORING) 412 ip->ip_sum = in_cksum_hdr(ip); 413 else 414 ip->ip_sum = in_cksum(m, 415 _IP_VHL_HL(ip->ip_vhl) << 2); 416 #else 417 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 418 #endif 419 420 /* Encapsulate the packet */ 421 error = ipip_output(m, isr, &mp, 0, 0); 422 if (mp == NULL && !error) { 423 /* Should never happen. */ 424 DPRINTF(("%s: ipip_output returns no mbuf and " 425 "no error!", __func__)); 426 error = EFAULT; 427 } 428 if (error) { 429 if (mp) { 430 /* XXX: Should never happen! */ 431 m_freem(mp); 432 } 433 m = NULL; /* ipip_output() already freed it */ 434 goto bad; 435 } 436 m = mp, mp = NULL; 437 /* 438 * ipip_output clears IP_DF in the new header. If 439 * we need to propagate IP_DF from the outer header, 440 * then we have to do it here. 441 * 442 * XXX shouldn't assume what ipip_output does. 443 */ 444 if (dst->sa.sa_family == AF_INET && setdf) { 445 if (m->m_len < sizeof (struct ip) && 446 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 447 error = ENOBUFS; 448 goto bad; 449 } 450 ip = mtod(m, struct ip *); 451 ip->ip_off = ntohs(ip->ip_off); 452 ip->ip_off |= IP_DF; 453 ip->ip_off = htons(ip->ip_off); 454 } 455 } 456 } 457 458 /* 459 * Dispatch to the appropriate IPsec transform logic. The 460 * packet will be returned for transmission after crypto 461 * processing, etc. are completed. For encapsulation we 462 * bypass this call because of the explicit call done above 463 * (necessary to deal with IP_DF handling for IPv4). 464 * 465 * NB: m & sav are ``passed to caller'' who's reponsible for 466 * for reclaiming their resources. 467 */ 468 if (sav->tdb_xform->xf_type != XF_IP4) { 469 ip = mtod(m, struct ip *); 470 i = ip->ip_hl << 2; 471 off = offsetof(struct ip, ip_p); 472 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 473 } else { 474 error = ipsec_process_done(m, isr); 475 } 476 IPSECREQUEST_UNLOCK(isr); 477 return error; 478 bad: 479 if (isr) 480 IPSECREQUEST_UNLOCK(isr); 481 if (m) 482 m_freem(m); 483 return error; 484 } 485 #endif 486 487 #ifdef INET6 488 /* 489 * Chop IP6 header from the payload. 490 */ 491 static struct mbuf * 492 ipsec6_splithdr(struct mbuf *m) 493 { 494 struct mbuf *mh; 495 struct ip6_hdr *ip6; 496 int hlen; 497 498 IPSEC_ASSERT(m->m_len >= sizeof (struct ip6_hdr), 499 ("first mbuf too short, len %u", m->m_len)); 500 ip6 = mtod(m, struct ip6_hdr *); 501 hlen = sizeof(struct ip6_hdr); 502 if (m->m_len > hlen) { 503 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 504 if (!mh) { 505 m_freem(m); 506 return NULL; 507 } 508 M_MOVE_PKTHDR(mh, m); 509 MH_ALIGN(mh, hlen); 510 m->m_len -= hlen; 511 m->m_data += hlen; 512 mh->m_next = m; 513 m = mh; 514 m->m_len = hlen; 515 bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen); 516 } else if (m->m_len < hlen) { 517 m = m_pullup(m, hlen); 518 if (!m) 519 return NULL; 520 } 521 return m; 522 } 523 524 /* 525 * IPsec output logic for IPv6, transport mode. 526 */ 527 int 528 ipsec6_output_trans( 529 struct ipsec_output_state *state, 530 u_char *nexthdrp, 531 struct mbuf *mprev, 532 struct secpolicy *sp, 533 int flags, 534 int *tun) 535 { 536 struct ipsecrequest *isr; 537 struct secasindex saidx; 538 int error = 0; 539 struct mbuf *m; 540 541 IPSEC_ASSERT(state != NULL, ("null state")); 542 IPSEC_ASSERT(state->m != NULL, ("null m")); 543 IPSEC_ASSERT(nexthdrp != NULL, ("null nexthdrp")); 544 IPSEC_ASSERT(mprev != NULL, ("null mprev")); 545 IPSEC_ASSERT(sp != NULL, ("null sp")); 546 IPSEC_ASSERT(tun != NULL, ("null tun")); 547 548 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 549 printf("%s: applyed SP\n", __func__); 550 kdebug_secpolicy(sp)); 551 552 isr = sp->req; 553 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 554 /* the rest will be handled by ipsec6_output_tunnel() */ 555 *tun = 1; /* need tunnel-mode processing */ 556 return 0; 557 } 558 559 *tun = 0; 560 m = state->m; 561 562 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 563 if (isr == NULL) { 564 #ifdef notdef 565 /* XXX should notification be done for all errors ? */ 566 /* 567 * Notify the fact that the packet is discarded 568 * to ourselves. I believe this is better than 569 * just silently discarding. (jinmei@kame.net) 570 * XXX: should we restrict the error to TCP packets? 571 * XXX: should we directly notify sockets via 572 * pfctlinputs? 573 */ 574 icmp6_error(m, ICMP6_DST_UNREACH, 575 ICMP6_DST_UNREACH_ADMIN, 0); 576 m = NULL; /* NB: icmp6_error frees mbuf */ 577 #endif 578 goto bad; 579 } 580 581 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 582 sizeof (struct ip6_hdr), 583 offsetof(struct ip6_hdr, ip6_nxt)); 584 bad: 585 if (m) 586 m_freem(m); 587 state->m = NULL; 588 return error; 589 } 590 591 static int 592 ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav) 593 { 594 struct ip6_hdr *oip6; 595 struct ip6_hdr *ip6; 596 size_t plen; 597 598 /* can't tunnel between different AFs */ 599 if (sav->sah->saidx.src.sa.sa_family != AF_INET6 || 600 sav->sah->saidx.dst.sa.sa_family != AF_INET6) { 601 m_freem(m); 602 return EINVAL; 603 } 604 IPSEC_ASSERT(m->m_len != sizeof (struct ip6_hdr), 605 ("mbuf wrong size; len %u", m->m_len)); 606 607 608 /* 609 * grow the mbuf to accomodate the new IPv6 header. 610 */ 611 plen = m->m_pkthdr.len; 612 if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) { 613 struct mbuf *n; 614 MGET(n, M_DONTWAIT, MT_DATA); 615 if (!n) { 616 m_freem(m); 617 return ENOBUFS; 618 } 619 n->m_len = sizeof(struct ip6_hdr); 620 n->m_next = m->m_next; 621 m->m_next = n; 622 m->m_pkthdr.len += sizeof(struct ip6_hdr); 623 oip6 = mtod(n, struct ip6_hdr *); 624 } else { 625 m->m_next->m_len += sizeof(struct ip6_hdr); 626 m->m_next->m_data -= sizeof(struct ip6_hdr); 627 m->m_pkthdr.len += sizeof(struct ip6_hdr); 628 oip6 = mtod(m->m_next, struct ip6_hdr *); 629 } 630 ip6 = mtod(m, struct ip6_hdr *); 631 bcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr)); 632 633 /* Fake link-local scope-class addresses */ 634 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 635 oip6->ip6_src.s6_addr16[1] = 0; 636 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 637 oip6->ip6_dst.s6_addr16[1] = 0; 638 639 /* construct new IPv6 header. see RFC 2401 5.1.2.2 */ 640 /* ECN consideration. */ 641 ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow); 642 if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr)) 643 ip6->ip6_plen = htons(plen); 644 else { 645 /* ip6->ip6_plen will be updated in ip6_output() */ 646 } 647 ip6->ip6_nxt = IPPROTO_IPV6; 648 sav->sah->saidx.src.sin6.sin6_addr = ip6->ip6_src; 649 sav->sah->saidx.dst.sin6.sin6_addr = ip6->ip6_dst; 650 ip6->ip6_hlim = IPV6_DEFHLIM; 651 652 /* XXX Should ip6_src be updated later ? */ 653 654 return 0; 655 } 656 657 /* 658 * IPsec output logic for IPv6, tunnel mode. 659 */ 660 int 661 ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags) 662 { 663 struct ip6_hdr *ip6; 664 struct ipsecrequest *isr; 665 struct secasindex saidx; 666 int error; 667 struct sockaddr_in6* dst6; 668 struct mbuf *m; 669 670 IPSEC_ASSERT(state != NULL, ("null state")); 671 IPSEC_ASSERT(state->m != NULL, ("null m")); 672 IPSEC_ASSERT(sp != NULL, ("null sp")); 673 674 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 675 printf("%s: applyed SP\n", __func__); 676 kdebug_secpolicy(sp)); 677 678 m = state->m; 679 /* 680 * transport mode ipsec (before the 1st tunnel mode) is already 681 * processed by ipsec6_output_trans(). 682 */ 683 for (isr = sp->req; isr; isr = isr->next) { 684 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 685 break; 686 } 687 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 688 if (isr == NULL) 689 goto bad; 690 691 /* 692 * There may be the case that SA status will be changed when 693 * we are refering to one. So calling splsoftnet(). 694 */ 695 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 696 /* 697 * build IPsec tunnel. 698 */ 699 /* XXX should be processed with other familiy */ 700 if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) { 701 ipseclog((LOG_ERR, "%s: family mismatched between " 702 "inner and outer, spi=%u\n", __func__, 703 ntohl(isr->sav->spi))); 704 newipsecstat.ips_out_inval++; 705 error = EAFNOSUPPORT; 706 goto bad; 707 } 708 709 m = ipsec6_splithdr(m); 710 if (!m) { 711 newipsecstat.ips_out_nomem++; 712 error = ENOMEM; 713 goto bad; 714 } 715 error = ipsec6_encapsulate(m, isr->sav); 716 if (error) { 717 m = NULL; 718 goto bad; 719 } 720 ip6 = mtod(m, struct ip6_hdr *); 721 722 state->ro = &isr->sav->sah->sa_route; 723 state->dst = (struct sockaddr *)&state->ro->ro_dst; 724 dst6 = (struct sockaddr_in6 *)state->dst; 725 if (state->ro->ro_rt 726 && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0 727 || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) { 728 RTFREE(state->ro->ro_rt); 729 state->ro->ro_rt = NULL; 730 } 731 if (state->ro->ro_rt == 0) { 732 bzero(dst6, sizeof(*dst6)); 733 dst6->sin6_family = AF_INET6; 734 dst6->sin6_len = sizeof(*dst6); 735 dst6->sin6_addr = ip6->ip6_dst; 736 rtalloc(state->ro); 737 } 738 if (state->ro->ro_rt == 0) { 739 ip6stat.ip6s_noroute++; 740 newipsecstat.ips_out_noroute++; 741 error = EHOSTUNREACH; 742 goto bad; 743 } 744 745 /* adjust state->dst if tunnel endpoint is offlink */ 746 if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) { 747 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway; 748 dst6 = (struct sockaddr_in6 *)state->dst; 749 } 750 } 751 752 m = ipsec6_splithdr(m); 753 if (!m) { 754 newipsecstat.ips_out_nomem++; 755 error = ENOMEM; 756 goto bad; 757 } 758 ip6 = mtod(m, struct ip6_hdr *); 759 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 760 sizeof (struct ip6_hdr), 761 offsetof(struct ip6_hdr, ip6_nxt)); 762 bad: 763 if (m) 764 m_freem(m); 765 state->m = NULL; 766 return error; 767 } 768 #endif /*INET6*/ 769