Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/netipsec/ipsec_output.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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/pfil.h> 48 #include <net/route.h> 49 50 #include <netinet/in.h> 51 #include <netinet/in_systm.h> 52 #include <netinet/ip.h> 53 #include <netinet/ip_var.h> 54 #include <netinet/in_var.h> 55 #include <netinet/ip_ecn.h> 56 #ifdef INET6 57 #include <netinet6/ip6_ecn.h> 58 #endif 59 60 #include <netinet/ip6.h> 61 #ifdef INET6 62 #include <netinet6/ip6_var.h> 63 #endif 64 #include <netinet/in_pcb.h> 65 #ifdef INET6 66 #include <netinet/icmp6.h> 67 #endif 68 69 #include <netipsec/ipsec.h> 70 #ifdef INET6 71 #include <netipsec/ipsec6.h> 72 #endif 73 #include <netipsec/ah_var.h> 74 #include <netipsec/esp_var.h> 75 #include <netipsec/ipcomp_var.h> 76 77 #include <netipsec/xform.h> 78 79 #include <netipsec/key.h> 80 #include <netipsec/keydb.h> 81 #include <netipsec/key_debug.h> 82 83 #include <machine/in_cksum.h> 84 85 #ifdef DEV_ENC 86 #include <net/if_enc.h> 87 #endif 88 89 90 int 91 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 92 { 93 struct tdb_ident *tdbi; 94 struct m_tag *mtag; 95 struct secasvar *sav; 96 struct secasindex *saidx; 97 int error; 98 99 IPSEC_SPLASSERT_SOFTNET(__func__); 100 101 IPSEC_ASSERT(m != NULL, ("null mbuf")); 102 IPSEC_ASSERT(isr != NULL, ("null ISR")); 103 sav = isr->sav; 104 IPSEC_ASSERT(sav != NULL, ("null SA")); 105 IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 106 107 saidx = &sav->sah->saidx; 108 switch (saidx->dst.sa.sa_family) { 109 #ifdef INET 110 case AF_INET: 111 /* Fix the header length, for AH processing. */ 112 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 113 break; 114 #endif /* INET */ 115 #ifdef INET6 116 case AF_INET6: 117 /* Fix the header length, for AH processing. */ 118 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 119 error = ENXIO; 120 goto bad; 121 } 122 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 123 /* No jumbogram support. */ 124 error = ENXIO; /*?*/ 125 goto bad; 126 } 127 mtod(m, struct ip6_hdr *)->ip6_plen = 128 htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 129 break; 130 #endif /* INET6 */ 131 default: 132 DPRINTF(("%s: unknown protocol family %u\n", __func__, 133 saidx->dst.sa.sa_family)); 134 error = ENXIO; 135 goto bad; 136 } 137 138 /* 139 * Add a record of what we've done or what needs to be done to the 140 * packet. 141 */ 142 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 143 sizeof(struct tdb_ident), M_NOWAIT); 144 if (mtag == NULL) { 145 DPRINTF(("%s: could not get packet tag\n", __func__)); 146 error = ENOMEM; 147 goto bad; 148 } 149 150 tdbi = (struct tdb_ident *)(mtag + 1); 151 tdbi->dst = saidx->dst; 152 tdbi->proto = saidx->proto; 153 tdbi->spi = sav->spi; 154 m_tag_prepend(m, mtag); 155 156 /* 157 * If there's another (bundled) SA to apply, do so. 158 * Note that this puts a burden on the kernel stack size. 159 * If this is a problem we'll need to introduce a queue 160 * to set the packet on so we can unwind the stack before 161 * doing further processing. 162 */ 163 if (isr->next) { 164 ipsec4stat.ips_out_bundlesa++; 165 return ipsec4_process_packet(m, isr->next, 0, 0); 166 } 167 key_sa_recordxfer(sav, m); /* record data transfer */ 168 169 /* 170 * We're done with IPsec processing, transmit the packet using the 171 * appropriate network protocol (IP or IPv6). SPD lookup will be 172 * performed again there. 173 */ 174 switch (saidx->dst.sa.sa_family) { 175 #ifdef INET 176 struct ip *ip; 177 case AF_INET: 178 ip = mtod(m, struct ip *); 179 ip->ip_len = ntohs(ip->ip_len); 180 ip->ip_off = ntohs(ip->ip_off); 181 182 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL); 183 #endif /* INET */ 184 #ifdef INET6 185 case AF_INET6: 186 /* 187 * We don't need massage, IPv6 header fields are always in 188 * net endian. 189 */ 190 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 191 #endif /* INET6 */ 192 } 193 panic("ipsec_process_done"); 194 bad: 195 m_freem(m); 196 KEY_FREESAV(&sav); 197 return (error); 198 } 199 200 static struct ipsecrequest * 201 ipsec_nextisr( 202 struct mbuf *m, 203 struct ipsecrequest *isr, 204 int af, 205 struct secasindex *saidx, 206 int *error 207 ) 208 { 209 #define IPSEC_OSTAT(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \ 210 isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++) 211 struct secasvar *sav; 212 213 IPSEC_SPLASSERT_SOFTNET(__func__); 214 IPSECREQUEST_LOCK_ASSERT(isr); 215 216 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 217 ("invalid address family %u", af)); 218 again: 219 /* 220 * Craft SA index to search for proper SA. Note that 221 * we only fillin unspecified SA peers for transport 222 * mode; for tunnel mode they must already be filled in. 223 */ 224 *saidx = isr->saidx; 225 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 226 /* Fillin unspecified SA peers only for transport mode */ 227 if (af == AF_INET) { 228 struct sockaddr_in *sin; 229 struct ip *ip = mtod(m, struct ip *); 230 231 if (saidx->src.sa.sa_len == 0) { 232 sin = &saidx->src.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_src; 237 } 238 if (saidx->dst.sa.sa_len == 0) { 239 sin = &saidx->dst.sin; 240 sin->sin_len = sizeof(*sin); 241 sin->sin_family = AF_INET; 242 sin->sin_port = IPSEC_PORT_ANY; 243 sin->sin_addr = ip->ip_dst; 244 } 245 } else { 246 struct sockaddr_in6 *sin6; 247 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 248 249 if (saidx->src.sin6.sin6_len == 0) { 250 sin6 = (struct sockaddr_in6 *)&saidx->src; 251 sin6->sin6_len = sizeof(*sin6); 252 sin6->sin6_family = AF_INET6; 253 sin6->sin6_port = IPSEC_PORT_ANY; 254 sin6->sin6_addr = ip6->ip6_src; 255 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 256 /* fix scope id for comparing SPD */ 257 sin6->sin6_addr.s6_addr16[1] = 0; 258 sin6->sin6_scope_id = 259 ntohs(ip6->ip6_src.s6_addr16[1]); 260 } 261 } 262 if (saidx->dst.sin6.sin6_len == 0) { 263 sin6 = (struct sockaddr_in6 *)&saidx->dst; 264 sin6->sin6_len = sizeof(*sin6); 265 sin6->sin6_family = AF_INET6; 266 sin6->sin6_port = IPSEC_PORT_ANY; 267 sin6->sin6_addr = ip6->ip6_dst; 268 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 269 /* fix scope id for comparing SPD */ 270 sin6->sin6_addr.s6_addr16[1] = 0; 271 sin6->sin6_scope_id = 272 ntohs(ip6->ip6_dst.s6_addr16[1]); 273 } 274 } 275 } 276 } 277 278 /* 279 * Lookup SA and validate it. 280 */ 281 *error = key_checkrequest(isr, saidx); 282 if (*error != 0) { 283 /* 284 * IPsec processing is required, but no SA found. 285 * I assume that key_acquire() had been called 286 * to get/establish the SA. Here I discard 287 * this packet because it is responsibility for 288 * upper layer to retransmit the packet. 289 */ 290 ipsec4stat.ips_out_nosa++; 291 goto bad; 292 } 293 sav = isr->sav; 294 if (sav == NULL) { 295 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 296 ("no SA found, but required; level %u", 297 ipsec_get_reqlevel(isr))); 298 IPSECREQUEST_UNLOCK(isr); 299 isr = isr->next; 300 /* 301 * If isr is NULL, we found a 'use' policy w/o SA. 302 * Return w/o error and w/o isr so we can drop out 303 * and continue w/o IPsec processing. 304 */ 305 if (isr == NULL) 306 return isr; 307 IPSECREQUEST_LOCK(isr); 308 goto again; 309 } 310 311 /* 312 * Check system global policy controls. 313 */ 314 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) || 315 (isr->saidx.proto == IPPROTO_AH && !ah_enable) || 316 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) { 317 DPRINTF(("%s: IPsec outbound packet dropped due" 318 " to policy (check your sysctls)\n", __func__)); 319 IPSEC_OSTAT(espstat.esps_pdrops, ahstat.ahs_pdrops, 320 ipcompstat.ipcomps_pdrops); 321 *error = EHOSTUNREACH; 322 goto bad; 323 } 324 325 /* 326 * Sanity check the SA contents for the caller 327 * before they invoke the xform output method. 328 */ 329 if (sav->tdb_xform == NULL) { 330 DPRINTF(("%s: no transform for SA\n", __func__)); 331 IPSEC_OSTAT(espstat.esps_noxform, ahstat.ahs_noxform, 332 ipcompstat.ipcomps_noxform); 333 *error = EHOSTUNREACH; 334 goto bad; 335 } 336 return isr; 337 bad: 338 IPSEC_ASSERT(*error != 0, ("error return w/ no error code")); 339 IPSECREQUEST_UNLOCK(isr); 340 return NULL; 341 #undef IPSEC_OSTAT 342 } 343 344 #ifdef INET 345 /* 346 * IPsec output logic for IPv4. 347 */ 348 int 349 ipsec4_process_packet( 350 struct mbuf *m, 351 struct ipsecrequest *isr, 352 int flags, 353 int tunalready) 354 { 355 struct secasindex saidx; 356 struct secasvar *sav; 357 struct ip *ip; 358 int error, i, off; 359 360 IPSEC_ASSERT(m != NULL, ("null mbuf")); 361 IPSEC_ASSERT(isr != NULL, ("null isr")); 362 363 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 364 365 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 366 if (isr == NULL) { 367 if (error != 0) 368 goto bad; 369 return EJUSTRETURN; 370 } 371 372 sav = isr->sav; 373 374 #ifdef DEV_ENC 375 encif->if_opackets++; 376 encif->if_obytes += m->m_pkthdr.len; 377 378 /* pass the mbuf to enc0 for bpf processing */ 379 ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE); 380 /* pass the mbuf to enc0 for packet filtering */ 381 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 382 goto bad; 383 #endif 384 385 if (!tunalready) { 386 union sockaddr_union *dst = &sav->sah->saidx.dst; 387 int setdf; 388 389 /* 390 * Collect IP_DF state from the outer header. 391 */ 392 if (dst->sa.sa_family == AF_INET) { 393 if (m->m_len < sizeof (struct ip) && 394 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 395 error = ENOBUFS; 396 goto bad; 397 } 398 ip = mtod(m, struct ip *); 399 /* Honor system-wide control of how to handle IP_DF */ 400 switch (ip4_ipsec_dfbit) { 401 case 0: /* clear in outer header */ 402 case 1: /* set in outer header */ 403 setdf = ip4_ipsec_dfbit; 404 break; 405 default: /* propagate to outer header */ 406 setdf = ntohs(ip->ip_off & IP_DF); 407 break; 408 } 409 } else { 410 ip = NULL; /* keep compiler happy */ 411 setdf = 0; 412 } 413 /* Do the appropriate encapsulation, if necessary */ 414 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 415 dst->sa.sa_family != AF_INET || /* PF mismatch */ 416 #if 0 417 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 418 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 419 #endif 420 (dst->sa.sa_family == AF_INET && /* Proxy */ 421 dst->sin.sin_addr.s_addr != INADDR_ANY && 422 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 423 struct mbuf *mp; 424 425 /* Fix IPv4 header checksum and length */ 426 if (m->m_len < sizeof (struct ip) && 427 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 428 error = ENOBUFS; 429 goto bad; 430 } 431 ip = mtod(m, struct ip *); 432 ip->ip_len = htons(m->m_pkthdr.len); 433 ip->ip_sum = 0; 434 #ifdef _IP_VHL 435 if (ip->ip_vhl == IP_VHL_BORING) 436 ip->ip_sum = in_cksum_hdr(ip); 437 else 438 ip->ip_sum = in_cksum(m, 439 _IP_VHL_HL(ip->ip_vhl) << 2); 440 #else 441 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 442 #endif 443 444 /* Encapsulate the packet */ 445 error = ipip_output(m, isr, &mp, 0, 0); 446 if (mp == NULL && !error) { 447 /* Should never happen. */ 448 DPRINTF(("%s: ipip_output returns no mbuf and " 449 "no error!", __func__)); 450 error = EFAULT; 451 } 452 if (error) { 453 if (mp) { 454 /* XXX: Should never happen! */ 455 m_freem(mp); 456 } 457 m = NULL; /* ipip_output() already freed it */ 458 goto bad; 459 } 460 m = mp, mp = NULL; 461 /* 462 * ipip_output clears IP_DF in the new header. If 463 * we need to propagate IP_DF from the outer header, 464 * then we have to do it here. 465 * 466 * XXX shouldn't assume what ipip_output does. 467 */ 468 if (dst->sa.sa_family == AF_INET && setdf) { 469 if (m->m_len < sizeof (struct ip) && 470 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 471 error = ENOBUFS; 472 goto bad; 473 } 474 ip = mtod(m, struct ip *); 475 ip->ip_off = ntohs(ip->ip_off); 476 ip->ip_off |= IP_DF; 477 ip->ip_off = htons(ip->ip_off); 478 } 479 } 480 } 481 482 #ifdef DEV_ENC 483 /* pass the mbuf to enc0 for bpf processing */ 484 ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_AFTER); 485 /* pass the mbuf to enc0 for packet filtering */ 486 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 487 goto bad; 488 #endif 489 490 /* 491 * Dispatch to the appropriate IPsec transform logic. The 492 * packet will be returned for transmission after crypto 493 * processing, etc. are completed. For encapsulation we 494 * bypass this call because of the explicit call done above 495 * (necessary to deal with IP_DF handling for IPv4). 496 * 497 * NB: m & sav are ``passed to caller'' who's reponsible for 498 * for reclaiming their resources. 499 */ 500 if (sav->tdb_xform->xf_type != XF_IP4) { 501 ip = mtod(m, struct ip *); 502 i = ip->ip_hl << 2; 503 off = offsetof(struct ip, ip_p); 504 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 505 } else { 506 error = ipsec_process_done(m, isr); 507 } 508 IPSECREQUEST_UNLOCK(isr); 509 return error; 510 bad: 511 if (isr) 512 IPSECREQUEST_UNLOCK(isr); 513 if (m) 514 m_freem(m); 515 return error; 516 } 517 #endif 518 519 #ifdef INET6 520 /* 521 * Chop IP6 header from the payload. 522 */ 523 static struct mbuf * 524 ipsec6_splithdr(struct mbuf *m) 525 { 526 struct mbuf *mh; 527 struct ip6_hdr *ip6; 528 int hlen; 529 530 IPSEC_ASSERT(m->m_len >= sizeof (struct ip6_hdr), 531 ("first mbuf too short, len %u", m->m_len)); 532 ip6 = mtod(m, struct ip6_hdr *); 533 hlen = sizeof(struct ip6_hdr); 534 if (m->m_len > hlen) { 535 MGETHDR(mh, M_DONTWAIT, MT_DATA); 536 if (!mh) { 537 m_freem(m); 538 return NULL; 539 } 540 M_MOVE_PKTHDR(mh, m); 541 MH_ALIGN(mh, hlen); 542 m->m_len -= hlen; 543 m->m_data += hlen; 544 mh->m_next = m; 545 m = mh; 546 m->m_len = hlen; 547 bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen); 548 } else if (m->m_len < hlen) { 549 m = m_pullup(m, hlen); 550 if (!m) 551 return NULL; 552 } 553 return m; 554 } 555 556 /* 557 * IPsec output logic for IPv6, transport mode. 558 */ 559 int 560 ipsec6_output_trans( 561 struct ipsec_output_state *state, 562 u_char *nexthdrp, 563 struct mbuf *mprev, 564 struct secpolicy *sp, 565 int flags, 566 int *tun) 567 { 568 struct ipsecrequest *isr; 569 struct secasindex saidx; 570 int error = 0; 571 struct mbuf *m; 572 573 IPSEC_ASSERT(state != NULL, ("null state")); 574 IPSEC_ASSERT(state->m != NULL, ("null m")); 575 IPSEC_ASSERT(nexthdrp != NULL, ("null nexthdrp")); 576 IPSEC_ASSERT(mprev != NULL, ("null mprev")); 577 IPSEC_ASSERT(sp != NULL, ("null sp")); 578 IPSEC_ASSERT(tun != NULL, ("null tun")); 579 580 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 581 printf("%s: applied SP\n", __func__); 582 kdebug_secpolicy(sp)); 583 584 isr = sp->req; 585 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 586 /* the rest will be handled by ipsec6_output_tunnel() */ 587 *tun = 1; /* need tunnel-mode processing */ 588 return 0; 589 } 590 591 *tun = 0; 592 m = state->m; 593 594 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 595 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 596 if (isr == NULL) { 597 if (error != 0) { 598 #ifdef notdef 599 /* XXX should notification be done for all errors ? */ 600 /* 601 * Notify the fact that the packet is discarded 602 * to ourselves. I believe this is better than 603 * just silently discarding. (jinmei@kame.net) 604 * XXX: should we restrict the error to TCP packets? 605 * XXX: should we directly notify sockets via 606 * pfctlinputs? 607 */ 608 icmp6_error(m, ICMP6_DST_UNREACH, 609 ICMP6_DST_UNREACH_ADMIN, 0); 610 m = NULL; /* NB: icmp6_error frees mbuf */ 611 #endif 612 goto bad; 613 } 614 return EJUSTRETURN; 615 } 616 617 error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 618 sizeof (struct ip6_hdr), 619 offsetof(struct ip6_hdr, 620 ip6_nxt)); 621 IPSECREQUEST_UNLOCK(isr); 622 return error; 623 bad: 624 if (isr) 625 IPSECREQUEST_UNLOCK(isr); 626 if (m) 627 m_freem(m); 628 state->m = NULL; 629 return error; 630 } 631 632 static int 633 ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav) 634 { 635 struct ip6_hdr *oip6; 636 struct ip6_hdr *ip6; 637 size_t plen; 638 639 /* can't tunnel between different AFs */ 640 if (sav->sah->saidx.src.sa.sa_family != AF_INET6 || 641 sav->sah->saidx.dst.sa.sa_family != AF_INET6) { 642 m_freem(m); 643 return EINVAL; 644 } 645 IPSEC_ASSERT(m->m_len == sizeof (struct ip6_hdr), 646 ("mbuf wrong size; len %u", m->m_len)); 647 648 649 /* 650 * grow the mbuf to accomodate the new IPv6 header. 651 */ 652 plen = m->m_pkthdr.len; 653 if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) { 654 struct mbuf *n; 655 MGET(n, M_DONTWAIT, MT_DATA); 656 if (!n) { 657 m_freem(m); 658 return ENOBUFS; 659 } 660 n->m_len = sizeof(struct ip6_hdr); 661 n->m_next = m->m_next; 662 m->m_next = n; 663 m->m_pkthdr.len += sizeof(struct ip6_hdr); 664 oip6 = mtod(n, struct ip6_hdr *); 665 } else { 666 m->m_next->m_len += sizeof(struct ip6_hdr); 667 m->m_next->m_data -= sizeof(struct ip6_hdr); 668 m->m_pkthdr.len += sizeof(struct ip6_hdr); 669 oip6 = mtod(m->m_next, struct ip6_hdr *); 670 } 671 ip6 = mtod(m, struct ip6_hdr *); 672 bcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr)); 673 674 /* Fake link-local scope-class addresses */ 675 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 676 oip6->ip6_src.s6_addr16[1] = 0; 677 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 678 oip6->ip6_dst.s6_addr16[1] = 0; 679 680 /* construct new IPv6 header. see RFC 2401 5.1.2.2 */ 681 /* ECN consideration. */ 682 ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow); 683 if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr)) 684 ip6->ip6_plen = htons(plen); 685 else { 686 /* ip6->ip6_plen will be updated in ip6_output() */ 687 } 688 ip6->ip6_nxt = IPPROTO_IPV6; 689 ip6->ip6_src = sav->sah->saidx.src.sin6.sin6_addr; 690 ip6->ip6_dst = sav->sah->saidx.dst.sin6.sin6_addr; 691 ip6->ip6_hlim = IPV6_DEFHLIM; 692 693 /* XXX Should ip6_src be updated later ? */ 694 695 return 0; 696 } 697 698 /* 699 * IPsec output logic for IPv6, tunnel mode. 700 */ 701 int 702 ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags) 703 { 704 struct ip6_hdr *ip6; 705 struct ipsecrequest *isr; 706 struct secasindex saidx; 707 int error; 708 struct sockaddr_in6 *dst6; 709 struct mbuf *m; 710 711 IPSEC_ASSERT(state != NULL, ("null state")); 712 IPSEC_ASSERT(state->m != NULL, ("null m")); 713 IPSEC_ASSERT(sp != NULL, ("null sp")); 714 715 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 716 printf("%s: applied SP\n", __func__); 717 kdebug_secpolicy(sp)); 718 719 m = state->m; 720 /* 721 * transport mode ipsec (before the 1st tunnel mode) is already 722 * processed by ipsec6_output_trans(). 723 */ 724 for (isr = sp->req; isr; isr = isr->next) { 725 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 726 break; 727 } 728 729 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 730 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 731 if (isr == NULL) { 732 if (error != 0) 733 goto bad; 734 return EJUSTRETURN; 735 } 736 737 #ifdef DEV_ENC 738 /* pass the mbuf to enc0 for bpf processing */ 739 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE); 740 /* pass the mbuf to enc0 for packet filtering */ 741 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 742 goto bad; 743 #endif 744 745 /* 746 * There may be the case that SA status will be changed when 747 * we are refering to one. So calling splsoftnet(). 748 */ 749 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 750 /* 751 * build IPsec tunnel. 752 */ 753 /* XXX should be processed with other familiy */ 754 if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) { 755 ipseclog((LOG_ERR, "%s: family mismatched between " 756 "inner and outer, spi=%u\n", __func__, 757 ntohl(isr->sav->spi))); 758 ipsec6stat.ips_out_inval++; 759 error = EAFNOSUPPORT; 760 goto bad; 761 } 762 763 m = ipsec6_splithdr(m); 764 if (!m) { 765 ipsec6stat.ips_out_nomem++; 766 error = ENOMEM; 767 goto bad; 768 } 769 error = ipsec6_encapsulate(m, isr->sav); 770 if (error) { 771 m = NULL; 772 goto bad; 773 } 774 ip6 = mtod(m, struct ip6_hdr *); 775 776 state->ro = 777 (struct route *)&isr->sav->sah->route_cache.sin6_route; 778 state->dst = (struct sockaddr *)&state->ro->ro_dst; 779 dst6 = (struct sockaddr_in6 *)state->dst; 780 if (state->ro->ro_rt 781 && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0 782 || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) { 783 RTFREE(state->ro->ro_rt); 784 state->ro->ro_rt = NULL; 785 } 786 if (state->ro->ro_rt == NULL) { 787 bzero(dst6, sizeof(*dst6)); 788 dst6->sin6_family = AF_INET6; 789 dst6->sin6_len = sizeof(*dst6); 790 dst6->sin6_addr = ip6->ip6_dst; 791 rtalloc(state->ro); 792 } 793 if (state->ro->ro_rt == NULL) { 794 ip6stat.ip6s_noroute++; 795 ipsec6stat.ips_out_noroute++; 796 error = EHOSTUNREACH; 797 goto bad; 798 } 799 800 /* adjust state->dst if tunnel endpoint is offlink */ 801 if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) 802 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway; 803 } 804 805 m = ipsec6_splithdr(m); 806 if (!m) { 807 ipsec6stat.ips_out_nomem++; 808 error = ENOMEM; 809 goto bad; 810 } 811 ip6 = mtod(m, struct ip6_hdr *); 812 813 #ifdef DEV_ENC 814 /* pass the mbuf to enc0 for bpf processing */ 815 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_AFTER); 816 /* pass the mbuf to enc0 for packet filtering */ 817 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 818 goto bad; 819 #endif 820 821 error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 822 sizeof (struct ip6_hdr), 823 offsetof(struct ip6_hdr, ip6_nxt)); 824 IPSECREQUEST_UNLOCK(isr); 825 return error; 826 bad: 827 if (isr) 828 IPSECREQUEST_UNLOCK(isr); 829 if (m) 830 m_freem(m); 831 state->m = NULL; 832 return error; 833 } 834 #endif /*INET6*/
Cache object: 882ea0efe4afcf619c93245b7d96f517
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]