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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/10.1/sys/netipsec/ipsec_output.c 264814 2014-04-23 11:22:54Z ae $ 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/route.h> 49 #include <net/vnet.h> 50 51 #include <netinet/in.h> 52 #include <netinet/in_systm.h> 53 #include <netinet/ip.h> 54 #include <netinet/ip_var.h> 55 #include <netinet/in_var.h> 56 #include <netinet/ip_ecn.h> 57 #ifdef INET6 58 #include <netinet6/ip6_ecn.h> 59 #endif 60 61 #include <netinet/ip6.h> 62 #ifdef INET6 63 #include <netinet6/ip6_var.h> 64 #endif 65 #include <netinet/in_pcb.h> 66 #ifdef INET6 67 #include <netinet/icmp6.h> 68 #endif 69 70 #include <netipsec/ipsec.h> 71 #ifdef INET6 72 #include <netipsec/ipsec6.h> 73 #endif 74 #include <netipsec/ah_var.h> 75 #include <netipsec/esp_var.h> 76 #include <netipsec/ipcomp_var.h> 77 78 #include <netipsec/xform.h> 79 80 #include <netipsec/key.h> 81 #include <netipsec/keydb.h> 82 #include <netipsec/key_debug.h> 83 84 #include <machine/in_cksum.h> 85 86 #ifdef IPSEC_NAT_T 87 #include <netinet/udp.h> 88 #endif 89 90 #ifdef DEV_ENC 91 #include <net/if_enc.h> 92 #endif 93 94 95 int 96 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 97 { 98 struct tdb_ident *tdbi; 99 struct m_tag *mtag; 100 struct secasvar *sav; 101 struct secasindex *saidx; 102 int error; 103 104 IPSEC_ASSERT(m != NULL, ("null mbuf")); 105 IPSEC_ASSERT(isr != NULL, ("null ISR")); 106 sav = isr->sav; 107 IPSEC_ASSERT(sav != NULL, ("null SA")); 108 IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 109 110 saidx = &sav->sah->saidx; 111 switch (saidx->dst.sa.sa_family) { 112 #ifdef INET 113 case AF_INET: 114 /* Fix the header length, for AH processing. */ 115 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 116 break; 117 #endif /* INET */ 118 #ifdef INET6 119 case AF_INET6: 120 /* Fix the header length, for AH processing. */ 121 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 122 error = ENXIO; 123 goto bad; 124 } 125 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 126 /* No jumbogram support. */ 127 error = ENXIO; /*?*/ 128 goto bad; 129 } 130 mtod(m, struct ip6_hdr *)->ip6_plen = 131 htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 132 break; 133 #endif /* INET6 */ 134 default: 135 DPRINTF(("%s: unknown protocol family %u\n", __func__, 136 saidx->dst.sa.sa_family)); 137 error = ENXIO; 138 goto bad; 139 } 140 141 /* 142 * Add a record of what we've done or what needs to be done to the 143 * packet. 144 */ 145 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 146 sizeof(struct tdb_ident), M_NOWAIT); 147 if (mtag == NULL) { 148 DPRINTF(("%s: could not get packet tag\n", __func__)); 149 error = ENOMEM; 150 goto bad; 151 } 152 153 tdbi = (struct tdb_ident *)(mtag + 1); 154 tdbi->dst = saidx->dst; 155 tdbi->proto = saidx->proto; 156 tdbi->spi = sav->spi; 157 m_tag_prepend(m, mtag); 158 159 /* 160 * If there's another (bundled) SA to apply, do so. 161 * Note that this puts a burden on the kernel stack size. 162 * If this is a problem we'll need to introduce a queue 163 * to set the packet on so we can unwind the stack before 164 * doing further processing. 165 */ 166 if (isr->next) { 167 IPSECSTAT_INC(ips_out_bundlesa); 168 /* XXX-BZ currently only support same AF bundles. */ 169 switch (saidx->dst.sa.sa_family) { 170 #ifdef INET 171 case AF_INET: 172 return ipsec4_process_packet(m, isr->next, 0, 0); 173 /* NOTREACHED */ 174 #endif 175 #ifdef notyet 176 #ifdef INET6 177 case AF_INET6: 178 /* XXX */ 179 ipsec6_output_trans() 180 ipsec6_output_tunnel() 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 encif->if_opackets++; 445 encif->if_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 ip->ip_len = htons(m->m_pkthdr.len); 502 ip->ip_sum = 0; 503 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 504 505 /* Encapsulate the packet */ 506 error = ipip_output(m, isr, &mp, 0, 0); 507 if (mp == NULL && !error) { 508 /* Should never happen. */ 509 DPRINTF(("%s: ipip_output returns no mbuf and " 510 "no error!", __func__)); 511 error = EFAULT; 512 } 513 if (error) { 514 if (mp) { 515 /* XXX: Should never happen! */ 516 m_freem(mp); 517 } 518 m = NULL; /* ipip_output() already freed it */ 519 goto bad; 520 } 521 m = mp, mp = NULL; 522 /* 523 * ipip_output clears IP_DF in the new header. If 524 * we need to propagate IP_DF from the outer header, 525 * then we have to do it here. 526 * 527 * XXX shouldn't assume what ipip_output does. 528 */ 529 if (dst->sa.sa_family == AF_INET && setdf) { 530 if (m->m_len < sizeof (struct ip) && 531 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 532 error = ENOBUFS; 533 goto bad; 534 } 535 ip = mtod(m, struct ip *); 536 ip->ip_off = ntohs(ip->ip_off); 537 ip->ip_off |= IP_DF; 538 ip->ip_off = htons(ip->ip_off); 539 } 540 } 541 } 542 543 #ifdef DEV_ENC 544 /* pass the mbuf to enc0 for bpf processing */ 545 ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_AFTER); 546 /* pass the mbuf to enc0 for packet filtering */ 547 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 548 goto bad; 549 #endif 550 551 /* 552 * Dispatch to the appropriate IPsec transform logic. The 553 * packet will be returned for transmission after crypto 554 * processing, etc. are completed. For encapsulation we 555 * bypass this call because of the explicit call done above 556 * (necessary to deal with IP_DF handling for IPv4). 557 * 558 * NB: m & sav are ``passed to caller'' who's reponsible for 559 * for reclaiming their resources. 560 */ 561 if (sav->tdb_xform->xf_type != XF_IP4) { 562 ip = mtod(m, struct ip *); 563 i = ip->ip_hl << 2; 564 off = offsetof(struct ip, ip_p); 565 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 566 } else { 567 error = ipsec_process_done(m, isr); 568 } 569 IPSECREQUEST_UNLOCK(isr); 570 return error; 571 bad: 572 if (isr) 573 IPSECREQUEST_UNLOCK(isr); 574 if (m) 575 m_freem(m); 576 return error; 577 } 578 #endif 579 580 #ifdef INET6 581 /* 582 * Chop IP6 header from the payload. 583 */ 584 static struct mbuf * 585 ipsec6_splithdr(struct mbuf *m) 586 { 587 struct mbuf *mh; 588 struct ip6_hdr *ip6; 589 int hlen; 590 591 IPSEC_ASSERT(m->m_len >= sizeof (struct ip6_hdr), 592 ("first mbuf too short, len %u", m->m_len)); 593 ip6 = mtod(m, struct ip6_hdr *); 594 hlen = sizeof(struct ip6_hdr); 595 if (m->m_len > hlen) { 596 MGETHDR(mh, M_NOWAIT, MT_DATA); 597 if (!mh) { 598 m_freem(m); 599 return NULL; 600 } 601 M_MOVE_PKTHDR(mh, m); 602 MH_ALIGN(mh, hlen); 603 m->m_len -= hlen; 604 m->m_data += hlen; 605 mh->m_next = m; 606 m = mh; 607 m->m_len = hlen; 608 bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen); 609 } else if (m->m_len < hlen) { 610 m = m_pullup(m, hlen); 611 if (!m) 612 return NULL; 613 } 614 return m; 615 } 616 617 /* 618 * IPsec output logic for IPv6, transport mode. 619 */ 620 int 621 ipsec6_output_trans( 622 struct ipsec_output_state *state, 623 u_char *nexthdrp, 624 struct mbuf *mprev, 625 struct secpolicy *sp, 626 int flags, 627 int *tun) 628 { 629 struct ipsecrequest *isr; 630 struct secasindex saidx; 631 int error = 0; 632 struct mbuf *m; 633 634 IPSEC_ASSERT(state != NULL, ("null state")); 635 IPSEC_ASSERT(state->m != NULL, ("null m")); 636 IPSEC_ASSERT(nexthdrp != NULL, ("null nexthdrp")); 637 IPSEC_ASSERT(mprev != NULL, ("null mprev")); 638 IPSEC_ASSERT(sp != NULL, ("null sp")); 639 IPSEC_ASSERT(tun != NULL, ("null tun")); 640 641 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 642 printf("%s: applied SP\n", __func__); 643 kdebug_secpolicy(sp)); 644 645 isr = sp->req; 646 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 647 /* the rest will be handled by ipsec6_output_tunnel() */ 648 *tun = 1; /* need tunnel-mode processing */ 649 return 0; 650 } 651 652 *tun = 0; 653 m = state->m; 654 655 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 656 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 657 if (isr == NULL) { 658 if (error != 0) { 659 #ifdef notdef 660 /* XXX should notification be done for all errors ? */ 661 /* 662 * Notify the fact that the packet is discarded 663 * to ourselves. I believe this is better than 664 * just silently discarding. (jinmei@kame.net) 665 * XXX: should we restrict the error to TCP packets? 666 * XXX: should we directly notify sockets via 667 * pfctlinputs? 668 */ 669 icmp6_error(m, ICMP6_DST_UNREACH, 670 ICMP6_DST_UNREACH_ADMIN, 0); 671 m = NULL; /* NB: icmp6_error frees mbuf */ 672 #endif 673 goto bad; 674 } 675 return EJUSTRETURN; 676 } 677 678 error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 679 sizeof (struct ip6_hdr), 680 offsetof(struct ip6_hdr, 681 ip6_nxt)); 682 IPSECREQUEST_UNLOCK(isr); 683 return error; 684 bad: 685 if (isr) 686 IPSECREQUEST_UNLOCK(isr); 687 if (m) 688 m_freem(m); 689 state->m = NULL; 690 return error; 691 } 692 693 static int 694 ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav) 695 { 696 struct ip6_hdr *oip6; 697 struct ip6_hdr *ip6; 698 size_t plen; 699 700 /* can't tunnel between different AFs */ 701 if (sav->sah->saidx.src.sa.sa_family != AF_INET6 || 702 sav->sah->saidx.dst.sa.sa_family != AF_INET6) { 703 m_freem(m); 704 return EINVAL; 705 } 706 IPSEC_ASSERT(m->m_len == sizeof (struct ip6_hdr), 707 ("mbuf wrong size; len %u", m->m_len)); 708 709 710 /* 711 * grow the mbuf to accomodate the new IPv6 header. 712 */ 713 plen = m->m_pkthdr.len; 714 if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) { 715 struct mbuf *n; 716 MGET(n, M_NOWAIT, MT_DATA); 717 if (!n) { 718 m_freem(m); 719 return ENOBUFS; 720 } 721 n->m_len = sizeof(struct ip6_hdr); 722 n->m_next = m->m_next; 723 m->m_next = n; 724 m->m_pkthdr.len += sizeof(struct ip6_hdr); 725 oip6 = mtod(n, struct ip6_hdr *); 726 } else { 727 m->m_next->m_len += sizeof(struct ip6_hdr); 728 m->m_next->m_data -= sizeof(struct ip6_hdr); 729 m->m_pkthdr.len += sizeof(struct ip6_hdr); 730 oip6 = mtod(m->m_next, struct ip6_hdr *); 731 } 732 ip6 = mtod(m, struct ip6_hdr *); 733 bcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr)); 734 735 /* Fake link-local scope-class addresses */ 736 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 737 oip6->ip6_src.s6_addr16[1] = 0; 738 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 739 oip6->ip6_dst.s6_addr16[1] = 0; 740 741 /* construct new IPv6 header. see RFC 2401 5.1.2.2 */ 742 /* ECN consideration. */ 743 ip6_ecn_ingress(V_ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow); 744 if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr)) 745 ip6->ip6_plen = htons(plen); 746 else { 747 /* ip6->ip6_plen will be updated in ip6_output() */ 748 } 749 ip6->ip6_nxt = IPPROTO_IPV6; 750 ip6->ip6_src = sav->sah->saidx.src.sin6.sin6_addr; 751 ip6->ip6_dst = sav->sah->saidx.dst.sin6.sin6_addr; 752 ip6->ip6_hlim = IPV6_DEFHLIM; 753 754 /* XXX Should ip6_src be updated later ? */ 755 756 return 0; 757 } 758 759 /* 760 * IPsec output logic for IPv6, tunnel mode. 761 */ 762 int 763 ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags) 764 { 765 struct ip6_hdr *ip6; 766 struct ipsecrequest *isr; 767 struct secasindex saidx; 768 int error; 769 struct sockaddr_in6 *dst6; 770 struct mbuf *m; 771 772 IPSEC_ASSERT(state != NULL, ("null state")); 773 IPSEC_ASSERT(state->m != NULL, ("null m")); 774 IPSEC_ASSERT(sp != NULL, ("null sp")); 775 776 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 777 printf("%s: applied SP\n", __func__); 778 kdebug_secpolicy(sp)); 779 780 m = state->m; 781 /* 782 * transport mode ipsec (before the 1st tunnel mode) is already 783 * processed by ipsec6_output_trans(). 784 */ 785 for (isr = sp->req; isr; isr = isr->next) { 786 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 787 break; 788 } 789 790 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 791 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 792 if (isr == NULL) { 793 if (error != 0) 794 goto bad; 795 return EJUSTRETURN; 796 } 797 798 #ifdef DEV_ENC 799 encif->if_opackets++; 800 encif->if_obytes += m->m_pkthdr.len; 801 802 /* pass the mbuf to enc0 for bpf processing */ 803 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE); 804 /* pass the mbuf to enc0 for packet filtering */ 805 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 806 goto bad; 807 #endif 808 809 /* 810 * There may be the case that SA status will be changed when 811 * we are refering to one. So calling splsoftnet(). 812 */ 813 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 814 /* 815 * build IPsec tunnel. 816 */ 817 /* XXX should be processed with other familiy */ 818 if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) { 819 ipseclog((LOG_ERR, "%s: family mismatched between " 820 "inner and outer, spi=%u\n", __func__, 821 ntohl(isr->sav->spi))); 822 IPSEC6STAT_INC(ips_out_inval); 823 error = EAFNOSUPPORT; 824 goto bad; 825 } 826 827 m = ipsec6_splithdr(m); 828 if (!m) { 829 IPSEC6STAT_INC(ips_out_nomem); 830 error = ENOMEM; 831 goto bad; 832 } 833 error = ipsec6_encapsulate(m, isr->sav); 834 if (error) { 835 m = NULL; 836 goto bad; 837 } 838 ip6 = mtod(m, struct ip6_hdr *); 839 840 state->ro = 841 (struct route *)&isr->sav->sah->route_cache.sin6_route; 842 state->dst = (struct sockaddr *)&state->ro->ro_dst; 843 dst6 = (struct sockaddr_in6 *)state->dst; 844 if (state->ro->ro_rt 845 && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0 846 || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) { 847 RTFREE(state->ro->ro_rt); 848 state->ro->ro_rt = NULL; 849 } 850 if (state->ro->ro_rt == NULL) { 851 bzero(dst6, sizeof(*dst6)); 852 dst6->sin6_family = AF_INET6; 853 dst6->sin6_len = sizeof(*dst6); 854 dst6->sin6_addr = ip6->ip6_dst; 855 rtalloc_ign_fib(state->ro, 0UL, M_GETFIB(m)); 856 } 857 if (state->ro->ro_rt == NULL) { 858 IP6STAT_INC(ip6s_noroute); 859 IPSEC6STAT_INC(ips_out_noroute); 860 error = EHOSTUNREACH; 861 goto bad; 862 } 863 864 /* adjust state->dst if tunnel endpoint is offlink */ 865 if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) 866 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway; 867 } 868 869 m = ipsec6_splithdr(m); 870 if (!m) { 871 IPSEC6STAT_INC(ips_out_nomem); 872 error = ENOMEM; 873 goto bad; 874 } 875 ip6 = mtod(m, struct ip6_hdr *); 876 877 #ifdef DEV_ENC 878 /* pass the mbuf to enc0 for bpf processing */ 879 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_AFTER); 880 /* pass the mbuf to enc0 for packet filtering */ 881 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 882 goto bad; 883 #endif 884 885 error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 886 sizeof (struct ip6_hdr), 887 offsetof(struct ip6_hdr, ip6_nxt)); 888 IPSECREQUEST_UNLOCK(isr); 889 return error; 890 bad: 891 if (isr) 892 IPSECREQUEST_UNLOCK(isr); 893 if (m) 894 m_freem(m); 895 state->m = NULL; 896 return error; 897 } 898 #endif /*INET6*/
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