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 /* $FreeBSD: releng/5.0/sys/netipsec/ipsec_output.c 105197 2002-10-16 02:10:08Z sam $ */ 2 /* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */ 3 4 /* 5 * IPsec output processing. 6 */ 7 #include "opt_inet.h" 8 #include "opt_inet6.h" 9 #include "opt_ipsec.h" 10 11 #include <sys/param.h> 12 #include <sys/systm.h> 13 #include <sys/mbuf.h> 14 #include <sys/domain.h> 15 #include <sys/protosw.h> 16 #include <sys/socket.h> 17 #include <sys/errno.h> 18 #include <sys/syslog.h> 19 20 #include <net/if.h> 21 #include <net/route.h> 22 23 #include <netinet/in.h> 24 #include <netinet/in_systm.h> 25 #include <netinet/ip.h> 26 #include <netinet/ip_var.h> 27 #include <netinet/in_var.h> 28 #include <netinet/ip_ecn.h> 29 #ifdef INET6 30 #include <netinet6/ip6_ecn.h> 31 #endif 32 33 #include <netinet/ip6.h> 34 #ifdef INET6 35 #include <netinet6/ip6_var.h> 36 #endif 37 #include <netinet/in_pcb.h> 38 #ifdef INET6 39 #include <netinet/icmp6.h> 40 #endif 41 42 #include <netipsec/ipsec.h> 43 #ifdef INET6 44 #include <netipsec/ipsec6.h> 45 #endif 46 #include <netipsec/ah_var.h> 47 #include <netipsec/esp_var.h> 48 #include <netipsec/ipcomp_var.h> 49 50 #include <netipsec/xform.h> 51 52 #include <netipsec/key.h> 53 #include <netipsec/keydb.h> 54 #include <netipsec/key_debug.h> 55 56 #include <machine/in_cksum.h> 57 58 int 59 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 60 { 61 struct tdb_ident *tdbi; 62 struct m_tag *mtag; 63 struct secasvar *sav; 64 struct secasindex *saidx; 65 int error; 66 67 #if 0 68 SPLASSERT(net, "ipsec_process_done"); 69 #endif 70 71 KASSERT(m != NULL, ("ipsec_process_done: null mbuf")); 72 KASSERT(isr != NULL, ("ipsec_process_done: null ISR")); 73 sav = isr->sav; 74 KASSERT(sav != NULL, ("ipsec_process_done: null SA")); 75 KASSERT(sav->sah != NULL, ("ipsec_process_done: null SAH")); 76 77 saidx = &sav->sah->saidx; 78 switch (saidx->dst.sa.sa_family) { 79 #ifdef INET 80 case AF_INET: 81 /* Fix the header length, for AH processing. */ 82 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 83 break; 84 #endif /* INET */ 85 #ifdef INET6 86 case AF_INET6: 87 /* Fix the header length, for AH processing. */ 88 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 89 error = ENXIO; 90 goto bad; 91 } 92 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 93 /* No jumbogram support. */ 94 error = ENXIO; /*?*/ 95 goto bad; 96 } 97 mtod(m, struct ip6_hdr *)->ip6_plen = 98 htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 99 break; 100 #endif /* INET6 */ 101 default: 102 DPRINTF(("ipsec_process_done: unknown protocol family %u\n", 103 saidx->dst.sa.sa_family)); 104 error = ENXIO; 105 goto bad; 106 } 107 108 /* 109 * Add a record of what we've done or what needs to be done to the 110 * packet. 111 */ 112 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 113 sizeof(struct tdb_ident), M_NOWAIT); 114 if (mtag == NULL) { 115 DPRINTF(("ipsec_process_done: could not get packet tag\n")); 116 error = ENOMEM; 117 goto bad; 118 } 119 120 tdbi = (struct tdb_ident *)(mtag + 1); 121 tdbi->dst = saidx->dst; 122 tdbi->proto = saidx->proto; 123 tdbi->spi = sav->spi; 124 m_tag_prepend(m, mtag); 125 126 /* 127 * If there's another (bundled) SA to apply, do so. 128 * Note that this puts a burden on the kernel stack size. 129 * If this is a problem we'll need to introduce a queue 130 * to set the packet on so we can unwind the stack before 131 * doing further processing. 132 */ 133 if (isr->next) { 134 newipsecstat.ips_out_bundlesa++; 135 return ipsec4_process_packet(m, isr->next, 0, 0); 136 } 137 138 /* 139 * We're done with IPsec processing, transmit the packet using the 140 * appropriate network protocol (IP or IPv6). SPD lookup will be 141 * performed again there. 142 */ 143 switch (saidx->dst.sa.sa_family) { 144 #ifdef INET 145 struct ip *ip; 146 case AF_INET: 147 ip = mtod(m, struct ip *); 148 ip->ip_len = ntohs(ip->ip_len); 149 ip->ip_off = ntohs(ip->ip_off); 150 151 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL); 152 #endif /* INET */ 153 #ifdef INET6 154 case AF_INET6: 155 /* 156 * We don't need massage, IPv6 header fields are always in 157 * net endian. 158 */ 159 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 160 #endif /* INET6 */ 161 } 162 panic("ipsec_process_done"); 163 bad: 164 m_freem(m); 165 KEY_FREESAV(&sav); 166 return (error); 167 } 168 169 static struct ipsecrequest * 170 ipsec_nextisr( 171 struct mbuf *m, 172 struct ipsecrequest *isr, 173 int af, 174 struct secasindex *saidx, 175 int *error 176 ) 177 { 178 #define IPSEC_OSTAT(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \ 179 isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++) 180 struct secasvar *sav; 181 182 #if 0 183 SPLASSERT(net, "ipsec_nextisr"); 184 #endif 185 KASSERT(af == AF_INET || af == AF_INET6, 186 ("ipsec_nextisr: invalid address family %u", af)); 187 again: 188 /* 189 * Craft SA index to search for proper SA. Note that 190 * we only fillin unspecified SA peers for transport 191 * mode; for tunnel mode they must already be filled in. 192 */ 193 *saidx = isr->saidx; 194 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 195 /* Fillin unspecified SA peers only for transport mode */ 196 if (af == AF_INET) { 197 struct sockaddr_in *sin; 198 struct ip *ip = mtod(m, struct ip *); 199 200 if (saidx->src.sa.sa_len == 0) { 201 sin = &saidx->src.sin; 202 sin->sin_len = sizeof(*sin); 203 sin->sin_family = AF_INET; 204 sin->sin_port = IPSEC_PORT_ANY; 205 sin->sin_addr = ip->ip_src; 206 } 207 if (saidx->dst.sa.sa_len == 0) { 208 sin = &saidx->dst.sin; 209 sin->sin_len = sizeof(*sin); 210 sin->sin_family = AF_INET; 211 sin->sin_port = IPSEC_PORT_ANY; 212 sin->sin_addr = ip->ip_dst; 213 } 214 } else { 215 struct sockaddr_in6 *sin6; 216 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 217 218 if (saidx->src.sin6.sin6_len == 0) { 219 sin6 = (struct sockaddr_in6 *)&saidx->src; 220 sin6->sin6_len = sizeof(*sin6); 221 sin6->sin6_family = AF_INET6; 222 sin6->sin6_port = IPSEC_PORT_ANY; 223 sin6->sin6_addr = ip6->ip6_src; 224 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 225 /* fix scope id for comparing SPD */ 226 sin6->sin6_addr.s6_addr16[1] = 0; 227 sin6->sin6_scope_id = 228 ntohs(ip6->ip6_src.s6_addr16[1]); 229 } 230 } 231 if (saidx->dst.sin6.sin6_len == 0) { 232 sin6 = (struct sockaddr_in6 *)&saidx->dst; 233 sin6->sin6_len = sizeof(*sin6); 234 sin6->sin6_family = AF_INET6; 235 sin6->sin6_port = IPSEC_PORT_ANY; 236 sin6->sin6_addr = ip6->ip6_dst; 237 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 238 /* fix scope id for comparing SPD */ 239 sin6->sin6_addr.s6_addr16[1] = 0; 240 sin6->sin6_scope_id = 241 ntohs(ip6->ip6_dst.s6_addr16[1]); 242 } 243 } 244 } 245 } 246 247 /* 248 * Lookup SA and validate it. 249 */ 250 *error = key_checkrequest(isr, saidx); 251 if (*error != 0) { 252 /* 253 * IPsec processing is required, but no SA found. 254 * I assume that key_acquire() had been called 255 * to get/establish the SA. Here I discard 256 * this packet because it is responsibility for 257 * upper layer to retransmit the packet. 258 */ 259 newipsecstat.ips_out_nosa++; 260 goto bad; 261 } 262 sav = isr->sav; 263 if (sav == NULL) { /* XXX valid return */ 264 KASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 265 ("ipsec_nextisr: no SA found, but required; level %u", 266 ipsec_get_reqlevel(isr))); 267 isr = isr->next; 268 if (isr == NULL) { 269 /*XXXstatistic??*/ 270 *error = EINVAL; /*XXX*/ 271 return isr; 272 } 273 goto again; 274 } 275 276 /* 277 * Check system global policy controls. 278 */ 279 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) || 280 (isr->saidx.proto == IPPROTO_AH && !ah_enable) || 281 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) { 282 DPRINTF(("ipsec_nextisr: IPsec outbound packet dropped due" 283 " to policy (check your sysctls)\n")); 284 IPSEC_OSTAT(espstat.esps_pdrops, ahstat.ahs_pdrops, 285 ipcompstat.ipcomps_pdrops); 286 *error = EHOSTUNREACH; 287 goto bad; 288 } 289 290 /* 291 * Sanity check the SA contents for the caller 292 * before they invoke the xform output method. 293 */ 294 if (sav->tdb_xform == NULL) { 295 DPRINTF(("ipsec_nextisr: no transform for SA\n")); 296 IPSEC_OSTAT(espstat.esps_noxform, ahstat.ahs_noxform, 297 ipcompstat.ipcomps_noxform); 298 *error = EHOSTUNREACH; 299 goto bad; 300 } 301 return isr; 302 bad: 303 KASSERT(*error != 0, ("ipsec_nextisr: error return w/ no error code")); 304 return NULL; 305 #undef IPSEC_OSTAT 306 } 307 308 #ifdef INET 309 /* 310 * IPsec output logic for IPv4. 311 */ 312 int 313 ipsec4_process_packet( 314 struct mbuf *m, 315 struct ipsecrequest *isr, 316 int flags, 317 int tunalready) 318 { 319 struct secasindex saidx; 320 struct secasvar *sav; 321 struct ip *ip; 322 int s, error, i, off; 323 324 KASSERT(m != NULL, ("ipsec4_process_packet: null mbuf")); 325 KASSERT(isr != NULL, ("ipsec4_process_packet: null isr")); 326 327 s = splnet(); /* insure SA contents don't change */ 328 329 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 330 if (isr == NULL) 331 goto bad; 332 333 sav = isr->sav; 334 if (!tunalready) { 335 union sockaddr_union *dst = &sav->sah->saidx.dst; 336 int setdf; 337 338 /* 339 * Collect IP_DF state from the outer header. 340 */ 341 if (dst->sa.sa_family == AF_INET) { 342 if (m->m_len < sizeof (struct ip) && 343 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 344 error = ENOBUFS; 345 goto bad; 346 } 347 ip = mtod(m, struct ip *); 348 /* Honor system-wide control of how to handle IP_DF */ 349 switch (ip4_ipsec_dfbit) { 350 case 0: /* clear in outer header */ 351 case 1: /* set in outer header */ 352 setdf = ip4_ipsec_dfbit; 353 break; 354 default: /* propagate to outer header */ 355 setdf = ntohs(ip->ip_off & IP_DF); 356 break; 357 } 358 } else { 359 ip = NULL; /* keep compiler happy */ 360 setdf = 0; 361 } 362 /* Do the appropriate encapsulation, if necessary */ 363 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 364 dst->sa.sa_family != AF_INET || /* PF mismatch */ 365 #if 0 366 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 367 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 368 #endif 369 (dst->sa.sa_family == AF_INET && /* Proxy */ 370 dst->sin.sin_addr.s_addr != INADDR_ANY && 371 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 372 struct mbuf *mp; 373 374 /* Fix IPv4 header checksum and length */ 375 if (m->m_len < sizeof (struct ip) && 376 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 377 error = ENOBUFS; 378 goto bad; 379 } 380 ip = mtod(m, struct ip *); 381 ip->ip_len = htons(m->m_pkthdr.len); 382 ip->ip_sum = 0; 383 #ifdef _IP_VHL 384 if (ip->ip_vhl == IP_VHL_BORING) 385 ip->ip_sum = in_cksum_hdr(ip); 386 else 387 ip->ip_sum = in_cksum(m, 388 _IP_VHL_HL(ip->ip_vhl) << 2); 389 #else 390 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 391 #endif 392 393 /* Encapsulate the packet */ 394 error = ipip_output(m, isr, &mp, 0, 0); 395 if (mp == NULL && !error) { 396 /* Should never happen. */ 397 DPRINTF(("ipsec4_process_packet: ipip_output " 398 "returns no mbuf and no error!")); 399 error = EFAULT; 400 } 401 if (error) { 402 if (mp) 403 m_freem(mp); 404 goto bad; 405 } 406 m = mp, mp = NULL; 407 /* 408 * ipip_output clears IP_DF in the new header. If 409 * we need to propagate IP_DF from the outer header, 410 * then we have to do it here. 411 * 412 * XXX shouldn't assume what ipip_output does. 413 */ 414 if (dst->sa.sa_family == AF_INET && setdf) { 415 if (m->m_len < sizeof (struct ip) && 416 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 417 error = ENOBUFS; 418 goto bad; 419 } 420 ip = mtod(m, struct ip *); 421 ip->ip_off = ntohs(ip->ip_off); 422 ip->ip_off |= IP_DF; 423 ip->ip_off = htons(ip->ip_off); 424 } 425 } 426 } 427 428 /* 429 * Dispatch to the appropriate IPsec transform logic. The 430 * packet will be returned for transmission after crypto 431 * processing, etc. are completed. For encapsulation we 432 * bypass this call because of the explicit call done above 433 * (necessary to deal with IP_DF handling for IPv4). 434 * 435 * NB: m & sav are ``passed to caller'' who's reponsible for 436 * for reclaiming their resources. 437 */ 438 if (sav->tdb_xform->xf_type != XF_IP4) { 439 ip = mtod(m, struct ip *); 440 i = ip->ip_hl << 2; 441 off = offsetof(struct ip, ip_p); 442 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 443 } else { 444 error = ipsec_process_done(m, isr); 445 } 446 splx(s); 447 return error; 448 bad: 449 splx(s); 450 if (m) 451 m_freem(m); 452 return error; 453 } 454 #endif 455 456 #ifdef INET6 457 /* 458 * Chop IP6 header from the payload. 459 */ 460 static struct mbuf * 461 ipsec6_splithdr(struct mbuf *m) 462 { 463 struct mbuf *mh; 464 struct ip6_hdr *ip6; 465 int hlen; 466 467 KASSERT(m->m_len >= sizeof (struct ip6_hdr), 468 ("ipsec6_splithdr: first mbuf too short, len %u", m->m_len)); 469 ip6 = mtod(m, struct ip6_hdr *); 470 hlen = sizeof(struct ip6_hdr); 471 if (m->m_len > hlen) { 472 MGETHDR(mh, M_DONTWAIT, MT_HEADER); 473 if (!mh) { 474 m_freem(m); 475 return NULL; 476 } 477 M_COPY_PKTHDR(mh, m); 478 MH_ALIGN(mh, hlen); 479 m->m_len -= hlen; 480 m->m_data += hlen; 481 mh->m_next = m; 482 m = mh; 483 m->m_len = hlen; 484 bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen); 485 } else if (m->m_len < hlen) { 486 m = m_pullup(m, hlen); 487 if (!m) 488 return NULL; 489 } 490 return m; 491 } 492 493 /* 494 * IPsec output logic for IPv6, transport mode. 495 */ 496 int 497 ipsec6_output_trans( 498 struct ipsec_output_state *state, 499 u_char *nexthdrp, 500 struct mbuf *mprev, 501 struct secpolicy *sp, 502 int flags, 503 int *tun) 504 { 505 struct ipsecrequest *isr; 506 struct secasindex saidx; 507 int error = 0; 508 struct mbuf *m; 509 510 KASSERT(state != NULL, ("ipsec6_output: null state")); 511 KASSERT(state->m != NULL, ("ipsec6_output: null m")); 512 KASSERT(nexthdrp != NULL, ("ipsec6_output: null nexthdrp")); 513 KASSERT(mprev != NULL, ("ipsec6_output: null mprev")); 514 KASSERT(sp != NULL, ("ipsec6_output: null sp")); 515 KASSERT(tun != NULL, ("ipsec6_output: null tun")); 516 517 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 518 printf("ipsec6_output_trans: applyed SP\n"); 519 kdebug_secpolicy(sp)); 520 521 isr = sp->req; 522 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 523 /* the rest will be handled by ipsec6_output_tunnel() */ 524 *tun = 1; /* need tunnel-mode processing */ 525 return 0; 526 } 527 528 *tun = 0; 529 m = state->m; 530 531 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 532 if (isr == NULL) { 533 #ifdef notdef 534 /* XXX should notification be done for all errors ? */ 535 /* 536 * Notify the fact that the packet is discarded 537 * to ourselves. I believe this is better than 538 * just silently discarding. (jinmei@kame.net) 539 * XXX: should we restrict the error to TCP packets? 540 * XXX: should we directly notify sockets via 541 * pfctlinputs? 542 */ 543 icmp6_error(m, ICMP6_DST_UNREACH, 544 ICMP6_DST_UNREACH_ADMIN, 0); 545 m = NULL; /* NB: icmp6_error frees mbuf */ 546 #endif 547 goto bad; 548 } 549 550 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 551 sizeof (struct ip6_hdr), 552 offsetof(struct ip6_hdr, ip6_nxt)); 553 bad: 554 if (m) 555 m_freem(m); 556 state->m = NULL; 557 return error; 558 } 559 560 static int 561 ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav) 562 { 563 struct ip6_hdr *oip6; 564 struct ip6_hdr *ip6; 565 size_t plen; 566 567 /* can't tunnel between different AFs */ 568 if (sav->sah->saidx.src.sa.sa_family != AF_INET6 || 569 sav->sah->saidx.dst.sa.sa_family != AF_INET6) { 570 m_freem(m); 571 return EINVAL; 572 } 573 KASSERT(m->m_len != sizeof (struct ip6_hdr), 574 ("ipsec6_encapsulate: mbuf wrong size; len %u", m->m_len)); 575 576 577 /* 578 * grow the mbuf to accomodate the new IPv6 header. 579 */ 580 plen = m->m_pkthdr.len; 581 if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) { 582 struct mbuf *n; 583 MGET(n, M_DONTWAIT, MT_DATA); 584 if (!n) { 585 m_freem(m); 586 return ENOBUFS; 587 } 588 n->m_len = sizeof(struct ip6_hdr); 589 n->m_next = m->m_next; 590 m->m_next = n; 591 m->m_pkthdr.len += sizeof(struct ip6_hdr); 592 oip6 = mtod(n, struct ip6_hdr *); 593 } else { 594 m->m_next->m_len += sizeof(struct ip6_hdr); 595 m->m_next->m_data -= sizeof(struct ip6_hdr); 596 m->m_pkthdr.len += sizeof(struct ip6_hdr); 597 oip6 = mtod(m->m_next, struct ip6_hdr *); 598 } 599 ip6 = mtod(m, struct ip6_hdr *); 600 ovbcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr)); 601 602 /* Fake link-local scope-class addresses */ 603 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 604 oip6->ip6_src.s6_addr16[1] = 0; 605 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 606 oip6->ip6_dst.s6_addr16[1] = 0; 607 608 /* construct new IPv6 header. see RFC 2401 5.1.2.2 */ 609 /* ECN consideration. */ 610 ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow); 611 if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr)) 612 ip6->ip6_plen = htons(plen); 613 else { 614 /* ip6->ip6_plen will be updated in ip6_output() */ 615 } 616 ip6->ip6_nxt = IPPROTO_IPV6; 617 sav->sah->saidx.src.sin6.sin6_addr = ip6->ip6_src; 618 sav->sah->saidx.dst.sin6.sin6_addr = ip6->ip6_dst; 619 ip6->ip6_hlim = IPV6_DEFHLIM; 620 621 /* XXX Should ip6_src be updated later ? */ 622 623 return 0; 624 } 625 626 /* 627 * IPsec output logic for IPv6, tunnel mode. 628 */ 629 int 630 ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags) 631 { 632 struct ip6_hdr *ip6; 633 struct ipsecrequest *isr; 634 struct secasindex saidx; 635 int error; 636 struct sockaddr_in6* dst6; 637 struct mbuf *m; 638 639 KASSERT(state != NULL, ("ipsec6_output: null state")); 640 KASSERT(state->m != NULL, ("ipsec6_output: null m")); 641 KASSERT(sp != NULL, ("ipsec6_output: null sp")); 642 643 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 644 printf("ipsec6_output_tunnel: applyed SP\n"); 645 kdebug_secpolicy(sp)); 646 647 m = state->m; 648 /* 649 * transport mode ipsec (before the 1st tunnel mode) is already 650 * processed by ipsec6_output_trans(). 651 */ 652 for (isr = sp->req; isr; isr = isr->next) { 653 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 654 break; 655 } 656 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 657 if (isr == NULL) 658 goto bad; 659 660 /* 661 * There may be the case that SA status will be changed when 662 * we are refering to one. So calling splsoftnet(). 663 */ 664 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 665 /* 666 * build IPsec tunnel. 667 */ 668 /* XXX should be processed with other familiy */ 669 if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) { 670 ipseclog((LOG_ERR, "ipsec6_output_tunnel: " 671 "family mismatched between inner and outer, spi=%u\n", 672 ntohl(isr->sav->spi))); 673 newipsecstat.ips_out_inval++; 674 error = EAFNOSUPPORT; 675 goto bad; 676 } 677 678 m = ipsec6_splithdr(m); 679 if (!m) { 680 newipsecstat.ips_out_nomem++; 681 error = ENOMEM; 682 goto bad; 683 } 684 error = ipsec6_encapsulate(m, isr->sav); 685 if (error) { 686 m = NULL; 687 goto bad; 688 } 689 ip6 = mtod(m, struct ip6_hdr *); 690 691 state->ro = &isr->sav->sah->sa_route; 692 state->dst = (struct sockaddr *)&state->ro->ro_dst; 693 dst6 = (struct sockaddr_in6 *)state->dst; 694 if (state->ro->ro_rt 695 && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0 696 || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) { 697 RTFREE(state->ro->ro_rt); 698 state->ro->ro_rt = NULL; 699 } 700 if (state->ro->ro_rt == 0) { 701 bzero(dst6, sizeof(*dst6)); 702 dst6->sin6_family = AF_INET6; 703 dst6->sin6_len = sizeof(*dst6); 704 dst6->sin6_addr = ip6->ip6_dst; 705 rtalloc(state->ro); 706 } 707 if (state->ro->ro_rt == 0) { 708 ip6stat.ip6s_noroute++; 709 newipsecstat.ips_out_noroute++; 710 error = EHOSTUNREACH; 711 goto bad; 712 } 713 714 /* adjust state->dst if tunnel endpoint is offlink */ 715 if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) { 716 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway; 717 dst6 = (struct sockaddr_in6 *)state->dst; 718 } 719 } 720 721 m = ipsec6_splithdr(m); 722 if (!m) { 723 newipsecstat.ips_out_nomem++; 724 error = ENOMEM; 725 goto bad; 726 } 727 ip6 = mtod(m, struct ip6_hdr *); 728 return (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 729 sizeof (struct ip6_hdr), 730 offsetof(struct ip6_hdr, ip6_nxt)); 731 bad: 732 if (m) 733 m_freem(m); 734 state->m = NULL; 735 return error; 736 } 737 #endif /*INET6*/
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