Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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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: releng/5.1/sys/netipsec/ipsec_output.c 113076 2003-04-04 12:56:20Z des $ 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 #if 0 93 SPLASSERT(net, "ipsec_process_done"); 94 #endif 95 96 KASSERT(m != NULL, ("ipsec_process_done: null mbuf")); 97 KASSERT(isr != NULL, ("ipsec_process_done: null ISR")); 98 sav = isr->sav; 99 KASSERT(sav != NULL, ("ipsec_process_done: null SA")); 100 KASSERT(sav->sah != NULL, ("ipsec_process_done: null SAH")); 101 102 saidx = &sav->sah->saidx; 103 switch (saidx->dst.sa.sa_family) { 104 #ifdef INET 105 case AF_INET: 106 /* Fix the header length, for AH processing. */ 107 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 108 break; 109 #endif /* INET */ 110 #ifdef INET6 111 case AF_INET6: 112 /* Fix the header length, for AH processing. */ 113 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 114 error = ENXIO; 115 goto bad; 116 } 117 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 118 /* No jumbogram support. */ 119 error = ENXIO; /*?*/ 120 goto bad; 121 } 122 mtod(m, struct ip6_hdr *)->ip6_plen = 123 htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 124 break; 125 #endif /* INET6 */ 126 default: 127 DPRINTF(("ipsec_process_done: unknown protocol family %u\n", 128 saidx->dst.sa.sa_family)); 129 error = ENXIO; 130 goto bad; 131 } 132 133 /* 134 * Add a record of what we've done or what needs to be done to the 135 * packet. 136 */ 137 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 138 sizeof(struct tdb_ident), M_NOWAIT); 139 if (mtag == NULL) { 140 DPRINTF(("ipsec_process_done: could not get packet tag\n")); 141 error = ENOMEM; 142 goto bad; 143 } 144 145 tdbi = (struct tdb_ident *)(mtag + 1); 146 tdbi->dst = saidx->dst; 147 tdbi->proto = saidx->proto; 148 tdbi->spi = sav->spi; 149 m_tag_prepend(m, mtag); 150 151 /* 152 * If there's another (bundled) SA to apply, do so. 153 * Note that this puts a burden on the kernel stack size. 154 * If this is a problem we'll need to introduce a queue 155 * to set the packet on so we can unwind the stack before 156 * doing further processing. 157 */ 158 if (isr->next) { 159 newipsecstat.ips_out_bundlesa++; 160 return ipsec4_process_packet(m, isr->next, 0, 0); 161 } 162 163 /* 164 * We're done with IPsec processing, transmit the packet using the 165 * appropriate network protocol (IP or IPv6). SPD lookup will be 166 * performed again there. 167 */ 168 switch (saidx->dst.sa.sa_family) { 169 #ifdef INET 170 struct ip *ip; 171 case AF_INET: 172 ip = mtod(m, struct ip *); 173 ip->ip_len = ntohs(ip->ip_len); 174 ip->ip_off = ntohs(ip->ip_off); 175 176 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL); 177 #endif /* INET */ 178 #ifdef INET6 179 case AF_INET6: 180 /* 181 * We don't need massage, IPv6 header fields are always in 182 * net endian. 183 */ 184 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 185 #endif /* INET6 */ 186 } 187 panic("ipsec_process_done"); 188 bad: 189 m_freem(m); 190 KEY_FREESAV(&sav); 191 return (error); 192 } 193 194 static struct ipsecrequest * 195 ipsec_nextisr( 196 struct mbuf *m, 197 struct ipsecrequest *isr, 198 int af, 199 struct secasindex *saidx, 200 int *error 201 ) 202 { 203 #define IPSEC_OSTAT(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \ 204 isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++) 205 struct secasvar *sav; 206 207 #if 0 208 SPLASSERT(net, "ipsec_nextisr"); 209 #endif 210 KASSERT(af == AF_INET || af == AF_INET6, 211 ("ipsec_nextisr: invalid address family %u", af)); 212 again: 213 /* 214 * Craft SA index to search for proper SA. Note that 215 * we only fillin unspecified SA peers for transport 216 * mode; for tunnel mode they must already be filled in. 217 */ 218 *saidx = isr->saidx; 219 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 220 /* Fillin unspecified SA peers only for transport mode */ 221 if (af == AF_INET) { 222 struct sockaddr_in *sin; 223 struct ip *ip = mtod(m, struct ip *); 224 225 if (saidx->src.sa.sa_len == 0) { 226 sin = &saidx->src.sin; 227 sin->sin_len = sizeof(*sin); 228 sin->sin_family = AF_INET; 229 sin->sin_port = IPSEC_PORT_ANY; 230 sin->sin_addr = ip->ip_src; 231 } 232 if (saidx->dst.sa.sa_len == 0) { 233 sin = &saidx->dst.sin; 234 sin->sin_len = sizeof(*sin); 235 sin->sin_family = AF_INET; 236 sin->sin_port = IPSEC_PORT_ANY; 237 sin->sin_addr = ip->ip_dst; 238 } 239 } else { 240 struct sockaddr_in6 *sin6; 241 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 242 243 if (saidx->src.sin6.sin6_len == 0) { 244 sin6 = (struct sockaddr_in6 *)&saidx->src; 245 sin6->sin6_len = sizeof(*sin6); 246 sin6->sin6_family = AF_INET6; 247 sin6->sin6_port = IPSEC_PORT_ANY; 248 sin6->sin6_addr = ip6->ip6_src; 249 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 250 /* fix scope id for comparing SPD */ 251 sin6->sin6_addr.s6_addr16[1] = 0; 252 sin6->sin6_scope_id = 253 ntohs(ip6->ip6_src.s6_addr16[1]); 254 } 255 } 256 if (saidx->dst.sin6.sin6_len == 0) { 257 sin6 = (struct sockaddr_in6 *)&saidx->dst; 258 sin6->sin6_len = sizeof(*sin6); 259 sin6->sin6_family = AF_INET6; 260 sin6->sin6_port = IPSEC_PORT_ANY; 261 sin6->sin6_addr = ip6->ip6_dst; 262 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 263 /* fix scope id for comparing SPD */ 264 sin6->sin6_addr.s6_addr16[1] = 0; 265 sin6->sin6_scope_id = 266 ntohs(ip6->ip6_dst.s6_addr16[1]); 267 } 268 } 269 } 270 } 271 272 /* 273 * Lookup SA and validate it. 274 */ 275 *error = key_checkrequest(isr, saidx); 276 if (*error != 0) { 277 /* 278 * IPsec processing is required, but no SA found. 279 * I assume that key_acquire() had been called 280 * to get/establish the SA. Here I discard 281 * this packet because it is responsibility for 282 * upper layer to retransmit the packet. 283 */ 284 newipsecstat.ips_out_nosa++; 285 goto bad; 286 } 287 sav = isr->sav; 288 if (sav == NULL) { /* XXX valid return */ 289 KASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 290 ("ipsec_nextisr: no SA found, but required; level %u", 291 ipsec_get_reqlevel(isr))); 292 isr = isr->next; 293 if (isr == NULL) { 294 /*XXXstatistic??*/ 295 *error = EINVAL; /*XXX*/ 296 return isr; 297 } 298 goto again; 299 } 300 301 /* 302 * Check system global policy controls. 303 */ 304 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) || 305 (isr->saidx.proto == IPPROTO_AH && !ah_enable) || 306 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) { 307 DPRINTF(("ipsec_nextisr: IPsec outbound packet dropped due" 308 " to policy (check your sysctls)\n")); 309 IPSEC_OSTAT(espstat.esps_pdrops, ahstat.ahs_pdrops, 310 ipcompstat.ipcomps_pdrops); 311 *error = EHOSTUNREACH; 312 goto bad; 313 } 314 315 /* 316 * Sanity check the SA contents for the caller 317 * before they invoke the xform output method. 318 */ 319 if (sav->tdb_xform == NULL) { 320 DPRINTF(("ipsec_nextisr: no transform for SA\n")); 321 IPSEC_OSTAT(espstat.esps_noxform, ahstat.ahs_noxform, 322 ipcompstat.ipcomps_noxform); 323 *error = EHOSTUNREACH; 324 goto bad; 325 } 326 return isr; 327 bad: 328 KASSERT(*error != 0, ("ipsec_nextisr: error return w/ no error code")); 329 return NULL; 330 #undef IPSEC_OSTAT 331 } 332 333 #ifdef INET 334 /* 335 * IPsec output logic for IPv4. 336 */ 337 int 338 ipsec4_process_packet( 339 struct mbuf *m, 340 struct ipsecrequest *isr, 341 int flags, 342 int tunalready) 343 { 344 struct secasindex saidx; 345 struct secasvar *sav; 346 struct ip *ip; 347 int s, error, i, off; 348 349 KASSERT(m != NULL, ("ipsec4_process_packet: null mbuf")); 350 KASSERT(isr != NULL, ("ipsec4_process_packet: null isr")); 351 352 s = splnet(); /* insure SA contents don't change */ 353 354 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 355 if (isr == NULL) 356 goto bad; 357 358 sav = isr->sav; 359 if (!tunalready) { 360 union sockaddr_union *dst = &sav->sah->saidx.dst; 361 int setdf; 362 363 /* 364 * Collect IP_DF state from the outer header. 365 */ 366 if (dst->sa.sa_family == AF_INET) { 367 if (m->m_len < sizeof (struct ip) && 368 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 369 error = ENOBUFS; 370 goto bad; 371 } 372 ip = mtod(m, struct ip *); 373 /* Honor system-wide control of how to handle IP_DF */ 374 switch (ip4_ipsec_dfbit) { 375 case 0: /* clear in outer header */ 376 case 1: /* set in outer header */ 377 setdf = ip4_ipsec_dfbit; 378 break; 379 default: /* propagate to outer header */ 380 setdf = ntohs(ip->ip_off & IP_DF); 381 break; 382 } 383 } else { 384 ip = NULL; /* keep compiler happy */ 385 setdf = 0; 386 } 387 /* Do the appropriate encapsulation, if necessary */ 388 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 389 dst->sa.sa_family != AF_INET || /* PF mismatch */ 390 #if 0 391 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 392 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 393 #endif 394 (dst->sa.sa_family == AF_INET && /* Proxy */ 395 dst->sin.sin_addr.s_addr != INADDR_ANY && 396 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 397 struct mbuf *mp; 398 399 /* Fix IPv4 header checksum and length */ 400 if (m->m_len < sizeof (struct ip) && 401 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 402 error = ENOBUFS; 403 goto bad; 404 } 405 ip = mtod(m, struct ip *); 406 ip->ip_len = htons(m->m_pkthdr.len); 407 ip->ip_sum = 0; 408 #ifdef _IP_VHL 409 if (ip->ip_vhl == IP_VHL_BORING) 410 ip->ip_sum = in_cksum_hdr(ip); 411 else 412 ip->ip_sum = in_cksum(m, 413 _IP_VHL_HL(ip->ip_vhl) << 2); 414 #else 415 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 416 #endif 417 418 /* Encapsulate the packet */ 419 error = ipip_output(m, isr, &mp, 0, 0); 420 if (mp == NULL && !error) { 421 /* Should never happen. */ 422 DPRINTF(("ipsec4_process_packet: ipip_output " 423 "returns no mbuf and no error!")); 424 error = EFAULT; 425 } 426 if (error) { 427 if (mp) 428 m_freem(mp); 429 goto bad; 430 } 431 m = mp, mp = NULL; 432 /* 433 * ipip_output clears IP_DF in the new header. If 434 * we need to propagate IP_DF from the outer header, 435 * then we have to do it here. 436 * 437 * XXX shouldn't assume what ipip_output does. 438 */ 439 if (dst->sa.sa_family == AF_INET && setdf) { 440 if (m->m_len < sizeof (struct ip) && 441 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 442 error = ENOBUFS; 443 goto bad; 444 } 445 ip = mtod(m, struct ip *); 446 ip->ip_off = ntohs(ip->ip_off); 447 ip->ip_off |= IP_DF; 448 ip->ip_off = htons(ip->ip_off); 449 } 450 } 451 } 452 453 /* 454 * Dispatch to the appropriate IPsec transform logic. The 455 * packet will be returned for transmission after crypto 456 * processing, etc. are completed. For encapsulation we 457 * bypass this call because of the explicit call done above 458 * (necessary to deal with IP_DF handling for IPv4). 459 * 460 * NB: m & sav are ``passed to caller'' who's reponsible for 461 * for reclaiming their resources. 462 */ 463 if (sav->tdb_xform->xf_type != XF_IP4) { 464 ip = mtod(m, struct ip *); 465 i = ip->ip_hl << 2; 466 off = offsetof(struct ip, ip_p); 467 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 468 } else { 469 error = ipsec_process_done(m, isr); 470 } 471 splx(s); 472 return error; 473 bad: 474 splx(s); 475 if (m) 476 m_freem(m); 477 return error; 478 } 479 #endif 480 481 #ifdef INET6 482 /* 483 * Chop IP6 header from the payload. 484 */ 485 static struct mbuf * 486 ipsec6_splithdr(struct mbuf *m) 487 { 488 struct mbuf *mh; 489 struct ip6_hdr *ip6; 490 int hlen; 491 492 KASSERT(m->m_len >= sizeof (struct ip6_hdr), 493 ("ipsec6_splithdr: first mbuf too short, len %u", m->m_len)); 494 ip6 = mtod(m, struct ip6_hdr *); 495 hlen = sizeof(struct ip6_hdr); 496 if (m->m_len > hlen) { 497 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 498 if (!mh) { 499 m_freem(m); 500 return NULL; 501 } 502 M_MOVE_PKTHDR(mh, m); 503 MH_ALIGN(mh, hlen); 504 m->m_len -= hlen; 505 m->m_data += hlen; 506 mh->m_next = m; 507 m = mh; 508 m->m_len = hlen; 509 bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen); 510 } else if (m->m_len < hlen) { 511 m = m_pullup(m, hlen); 512 if (!m) 513 return NULL; 514 } 515 return m; 516 } 517 518 /* 519 * IPsec output logic for IPv6, transport mode. 520 */ 521 int 522 ipsec6_output_trans( 523 struct ipsec_output_state *state, 524 u_char *nexthdrp, 525 struct mbuf *mprev, 526 struct secpolicy *sp, 527 int flags, 528 int *tun) 529 { 530 struct ipsecrequest *isr; 531 struct secasindex saidx; 532 int error = 0; 533 struct mbuf *m; 534 535 KASSERT(state != NULL, ("ipsec6_output: null state")); 536 KASSERT(state->m != NULL, ("ipsec6_output: null m")); 537 KASSERT(nexthdrp != NULL, ("ipsec6_output: null nexthdrp")); 538 KASSERT(mprev != NULL, ("ipsec6_output: null mprev")); 539 KASSERT(sp != NULL, ("ipsec6_output: null sp")); 540 KASSERT(tun != NULL, ("ipsec6_output: null tun")); 541 542 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 543 printf("ipsec6_output_trans: applyed SP\n"); 544 kdebug_secpolicy(sp)); 545 546 isr = sp->req; 547 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 548 /* the rest will be handled by ipsec6_output_tunnel() */ 549 *tun = 1; /* need tunnel-mode processing */ 550 return 0; 551 } 552 553 *tun = 0; 554 m = state->m; 555 556 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 557 if (isr == NULL) { 558 #ifdef notdef 559 /* XXX should notification be done for all errors ? */ 560 /* 561 * Notify the fact that the packet is discarded 562 * to ourselves. I believe this is better than 563 * just silently discarding. (jinmei@kame.net) 564 * XXX: should we restrict the error to TCP packets? 565 * XXX: should we directly notify sockets via 566 * pfctlinputs? 567 */ 568 icmp6_error(m, ICMP6_DST_UNREACH, 569 ICMP6_DST_UNREACH_ADMIN, 0); 570 m = NULL; /* NB: icmp6_error frees mbuf */ 571 #endif 572 goto bad; 573 } 574 575 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 576 sizeof (struct ip6_hdr), 577 offsetof(struct ip6_hdr, ip6_nxt)); 578 bad: 579 if (m) 580 m_freem(m); 581 state->m = NULL; 582 return error; 583 } 584 585 static int 586 ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav) 587 { 588 struct ip6_hdr *oip6; 589 struct ip6_hdr *ip6; 590 size_t plen; 591 592 /* can't tunnel between different AFs */ 593 if (sav->sah->saidx.src.sa.sa_family != AF_INET6 || 594 sav->sah->saidx.dst.sa.sa_family != AF_INET6) { 595 m_freem(m); 596 return EINVAL; 597 } 598 KASSERT(m->m_len != sizeof (struct ip6_hdr), 599 ("ipsec6_encapsulate: mbuf wrong size; len %u", m->m_len)); 600 601 602 /* 603 * grow the mbuf to accomodate the new IPv6 header. 604 */ 605 plen = m->m_pkthdr.len; 606 if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) { 607 struct mbuf *n; 608 MGET(n, M_DONTWAIT, MT_DATA); 609 if (!n) { 610 m_freem(m); 611 return ENOBUFS; 612 } 613 n->m_len = sizeof(struct ip6_hdr); 614 n->m_next = m->m_next; 615 m->m_next = n; 616 m->m_pkthdr.len += sizeof(struct ip6_hdr); 617 oip6 = mtod(n, struct ip6_hdr *); 618 } else { 619 m->m_next->m_len += sizeof(struct ip6_hdr); 620 m->m_next->m_data -= sizeof(struct ip6_hdr); 621 m->m_pkthdr.len += sizeof(struct ip6_hdr); 622 oip6 = mtod(m->m_next, struct ip6_hdr *); 623 } 624 ip6 = mtod(m, struct ip6_hdr *); 625 bcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr)); 626 627 /* Fake link-local scope-class addresses */ 628 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 629 oip6->ip6_src.s6_addr16[1] = 0; 630 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 631 oip6->ip6_dst.s6_addr16[1] = 0; 632 633 /* construct new IPv6 header. see RFC 2401 5.1.2.2 */ 634 /* ECN consideration. */ 635 ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow); 636 if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr)) 637 ip6->ip6_plen = htons(plen); 638 else { 639 /* ip6->ip6_plen will be updated in ip6_output() */ 640 } 641 ip6->ip6_nxt = IPPROTO_IPV6; 642 sav->sah->saidx.src.sin6.sin6_addr = ip6->ip6_src; 643 sav->sah->saidx.dst.sin6.sin6_addr = ip6->ip6_dst; 644 ip6->ip6_hlim = IPV6_DEFHLIM; 645 646 /* XXX Should ip6_src be updated later ? */ 647 648 return 0; 649 } 650 651 /* 652 * IPsec output logic for IPv6, tunnel mode. 653 */ 654 int 655 ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags) 656 { 657 struct ip6_hdr *ip6; 658 struct ipsecrequest *isr; 659 struct secasindex saidx; 660 int error; 661 struct sockaddr_in6* dst6; 662 struct mbuf *m; 663 664 KASSERT(state != NULL, ("ipsec6_output: null state")); 665 KASSERT(state->m != NULL, ("ipsec6_output: null m")); 666 KASSERT(sp != NULL, ("ipsec6_output: null sp")); 667 668 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 669 printf("ipsec6_output_tunnel: applyed SP\n"); 670 kdebug_secpolicy(sp)); 671 672 m = state->m; 673 /* 674 * transport mode ipsec (before the 1st tunnel mode) is already 675 * processed by ipsec6_output_trans(). 676 */ 677 for (isr = sp->req; isr; isr = isr->next) { 678 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 679 break; 680 } 681 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 682 if (isr == NULL) 683 goto bad; 684 685 /* 686 * There may be the case that SA status will be changed when 687 * we are refering to one. So calling splsoftnet(). 688 */ 689 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 690 /* 691 * build IPsec tunnel. 692 */ 693 /* XXX should be processed with other familiy */ 694 if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) { 695 ipseclog((LOG_ERR, "ipsec6_output_tunnel: " 696 "family mismatched between inner and outer, spi=%u\n", 697 ntohl(isr->sav->spi))); 698 newipsecstat.ips_out_inval++; 699 error = EAFNOSUPPORT; 700 goto bad; 701 } 702 703 m = ipsec6_splithdr(m); 704 if (!m) { 705 newipsecstat.ips_out_nomem++; 706 error = ENOMEM; 707 goto bad; 708 } 709 error = ipsec6_encapsulate(m, isr->sav); 710 if (error) { 711 m = NULL; 712 goto bad; 713 } 714 ip6 = mtod(m, struct ip6_hdr *); 715 716 state->ro = &isr->sav->sah->sa_route; 717 state->dst = (struct sockaddr *)&state->ro->ro_dst; 718 dst6 = (struct sockaddr_in6 *)state->dst; 719 if (state->ro->ro_rt 720 && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0 721 || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) { 722 RTFREE(state->ro->ro_rt); 723 state->ro->ro_rt = NULL; 724 } 725 if (state->ro->ro_rt == 0) { 726 bzero(dst6, sizeof(*dst6)); 727 dst6->sin6_family = AF_INET6; 728 dst6->sin6_len = sizeof(*dst6); 729 dst6->sin6_addr = ip6->ip6_dst; 730 rtalloc(state->ro); 731 } 732 if (state->ro->ro_rt == 0) { 733 ip6stat.ip6s_noroute++; 734 newipsecstat.ips_out_noroute++; 735 error = EHOSTUNREACH; 736 goto bad; 737 } 738 739 /* adjust state->dst if tunnel endpoint is offlink */ 740 if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) { 741 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway; 742 dst6 = (struct sockaddr_in6 *)state->dst; 743 } 744 } 745 746 m = ipsec6_splithdr(m); 747 if (!m) { 748 newipsecstat.ips_out_nomem++; 749 error = ENOMEM; 750 goto bad; 751 } 752 ip6 = mtod(m, struct ip6_hdr *); 753 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 754 sizeof (struct ip6_hdr), 755 offsetof(struct ip6_hdr, ip6_nxt)); 756 bad: 757 if (m) 758 m_freem(m); 759 state->m = NULL; 760 return error; 761 } 762 #endif /*INET6*/
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