ipsec_output.c revision 1.23
1 /* $NetBSD: ipsec_output.c,v 1.23 2007/10/28 15:48:23 adrianp Exp $ */ 2 3 /*- 4 * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD: /repoman/r/ncvs/src/sys/netipsec/ipsec_output.c,v 1.3.2.2 2003/03/28 20:32:53 sam Exp $ 29 */ 30 31 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: ipsec_output.c,v 1.23 2007/10/28 15:48:23 adrianp Exp $"); 33 34 /* 35 * IPsec output processing. 36 */ 37 #include "opt_inet.h" 38 #ifdef __FreeBSD__ 39 #include "opt_inet6.h" 40 #endif 41 #include "opt_ipsec.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/mbuf.h> 46 #include <sys/domain.h> 47 #include <sys/protosw.h> 48 #include <sys/socket.h> 49 #include <sys/errno.h> 50 #include <sys/syslog.h> 51 52 #include <net/if.h> 53 #include <net/route.h> 54 55 #include <netinet/in.h> 56 #include <netinet/in_systm.h> 57 #include <netinet/ip.h> 58 #include <netinet/ip_var.h> 59 #include <netinet/in_var.h> 60 #include <netinet/ip_ecn.h> 61 #ifdef INET6 62 # ifdef __FreeBSD__ 63 # include <netinet6/ip6_ecn.h> 64 # endif 65 #endif 66 67 #include <netinet/ip6.h> 68 #ifdef INET6 69 #include <netinet6/ip6_var.h> 70 #endif 71 #include <netinet/in_pcb.h> 72 #ifdef INET6 73 #include <netinet/icmp6.h> 74 #endif 75 #ifdef IPSEC_NAT_T 76 #include <netinet/udp.h> 77 #endif 78 79 #include <netipsec/ipsec.h> 80 #include <netipsec/ipsec_var.h> 81 #ifdef INET6 82 #include <netipsec/ipsec6.h> 83 #endif 84 #include <netipsec/ah_var.h> 85 #include <netipsec/esp_var.h> 86 #include <netipsec/ipcomp_var.h> 87 88 #include <netipsec/xform.h> 89 90 #include <netipsec/key.h> 91 #include <netipsec/keydb.h> 92 #include <netipsec/key_debug.h> 93 #include <netipsec/ipsec_osdep.h> 94 95 #include <net/net_osdep.h> /* ovbcopy() in ipsec6_encapsulate() */ 96 97 int 98 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 99 { 100 struct tdb_ident *tdbi; 101 struct m_tag *mtag; 102 struct secasvar *sav; 103 struct secasindex *saidx; 104 int error; 105 #ifdef INET 106 struct ip * ip; 107 #endif /* INET */ 108 #ifdef INET6 109 struct ip6_hdr * ip6; 110 #endif /* INET6 */ 111 #ifdef IPSEC_NAT_T 112 struct mbuf * mo; 113 struct udphdr *udp = NULL; 114 uint64_t * data = NULL; 115 int hlen, roff; 116 #endif /* IPSEC_NAT_T */ 117 118 IPSEC_SPLASSERT_SOFTNET("ipsec_process_done"); 119 120 IPSEC_ASSERT(m != NULL, ("ipsec_process_done: null mbuf")); 121 IPSEC_ASSERT(isr != NULL, ("ipsec_process_done: null ISR")); 122 sav = isr->sav; 123 IPSEC_ASSERT(sav != NULL, ("ipsec_process_done: null SA")); 124 IPSEC_ASSERT(sav->sah != NULL, ("ipsec_process_done: null SAH")); 125 126 saidx = &sav->sah->saidx; 127 128 #ifdef IPSEC_NAT_T 129 if(sav->natt_type != 0) { 130 ip = mtod(m, struct ip *); 131 132 hlen = sizeof(struct udphdr); 133 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 134 hlen += sizeof(uint64_t); 135 136 mo = m_makespace(m, sizeof(struct ip), hlen, &roff); 137 if (mo == NULL) { 138 DPRINTF(("ipsec_process_done : failed to inject" 139 "%u byte UDP for SA %s/%08lx\n", 140 hlen, ipsec_address(&saidx->dst), 141 (u_long) ntohl(sav->spi))); 142 error = ENOBUFS; 143 goto bad; 144 } 145 146 udp = (struct udphdr*) (mtod(mo, char*) + roff); 147 data = (uint64_t*) (udp + 1); 148 149 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 150 *data = 0; /* NON-IKE Marker */ 151 152 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 153 udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT); 154 else 155 udp->uh_sport = key_portfromsaddr(&saidx->src); 156 157 udp->uh_dport = key_portfromsaddr(&saidx->dst); 158 udp->uh_sum = 0; 159 #ifdef _IP_VHL 160 udp->uh_ulen = htons(m->m_pkthdr.len - 161 (IP_VHL_HL(ip->ip_vhl) << 2)); 162 #else 163 udp->uh_ulen = htons(m->m_pkthdr.len - (ip->ip_hl << 2)); 164 #endif 165 } 166 #endif /* IPSEC_NAT_T */ 167 168 switch (saidx->dst.sa.sa_family) { 169 #ifdef INET 170 case AF_INET: 171 /* Fix the header length, for AH processing. */ 172 ip = mtod(m, struct ip *); 173 ip->ip_len = htons(m->m_pkthdr.len); 174 #ifdef IPSEC_NAT_T 175 if (sav->natt_type != 0) 176 ip->ip_p = IPPROTO_UDP; 177 #endif /* IPSEC_NAT_T */ 178 break; 179 #endif /* INET */ 180 #ifdef INET6 181 case AF_INET6: 182 /* Fix the header length, for AH processing. */ 183 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 184 error = ENXIO; 185 goto bad; 186 } 187 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 188 /* No jumbogram support. */ 189 error = ENXIO; /*?*/ 190 goto bad; 191 } 192 ip6 = mtod(m, struct ip6_hdr *); 193 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 194 #ifdef IPSEC_NAT_T 195 if (sav->natt_type != 0) 196 ip6->ip6_nxt = IPPROTO_UDP; 197 #endif /* IPSEC_NAT_T */ 198 break; 199 #endif /* INET6 */ 200 default: 201 DPRINTF(("ipsec_process_done: unknown protocol family %u\n", 202 saidx->dst.sa.sa_family)); 203 error = ENXIO; 204 goto bad; 205 } 206 207 /* 208 * Add a record of what we've done or what needs to be done to the 209 * packet. 210 */ 211 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 212 sizeof(struct tdb_ident), M_NOWAIT); 213 if (mtag == NULL) { 214 DPRINTF(("ipsec_process_done: could not get packet tag\n")); 215 error = ENOMEM; 216 goto bad; 217 } 218 219 tdbi = (struct tdb_ident *)(mtag + 1); 220 tdbi->dst = saidx->dst; 221 tdbi->proto = saidx->proto; 222 tdbi->spi = sav->spi; 223 m_tag_prepend(m, mtag); 224 225 /* 226 * If there's another (bundled) SA to apply, do so. 227 * Note that this puts a burden on the kernel stack size. 228 * If this is a problem we'll need to introduce a queue 229 * to set the packet on so we can unwind the stack before 230 * doing further processing. 231 */ 232 if (isr->next) { 233 newipsecstat.ips_out_bundlesa++; 234 switch ( saidx->dst.sa.sa_family ) { 235 #ifdef INET 236 case AF_INET: 237 return ipsec4_process_packet(m, isr->next, 0,0); 238 #endif /* INET */ 239 #ifdef INET6 240 case AF_INET6: 241 return ipsec6_process_packet(m,isr->next); 242 #endif /* INET6 */ 243 default : 244 DPRINTF(("ipsec_process_done: unknown protocol family %u\n", 245 saidx->dst.sa.sa_family)); 246 error = ENXIO; 247 goto bad; 248 } 249 } 250 251 /* 252 * We're done with IPsec processing, transmit the packet using the 253 * appropriate network protocol (IP or IPv6). SPD lookup will be 254 * performed again there. 255 */ 256 switch (saidx->dst.sa.sa_family) { 257 #ifdef INET 258 case AF_INET: 259 ip = mtod(m, struct ip *); 260 #ifdef __FreeBSD__ 261 /* FreeBSD ip_output() expects ip_len, ip_off in host endian */ 262 ip->ip_len = ntohs(ip->ip_len); 263 ip->ip_off = ntohs(ip->ip_off); 264 #endif /* __FreeBSD_ */ 265 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, 266 (struct ip_moptions *)NULL, (struct socket *)NULL); 267 268 #endif /* INET */ 269 #ifdef INET6 270 case AF_INET6: 271 /* 272 * We don't need massage, IPv6 header fields are always in 273 * net endian. 274 */ 275 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 276 #endif /* INET6 */ 277 } 278 panic("ipsec_process_done"); 279 bad: 280 m_freem(m); 281 KEY_FREESAV(&sav); 282 return (error); 283 } 284 285 static struct ipsecrequest * 286 ipsec_nextisr( 287 struct mbuf *m, 288 struct ipsecrequest *isr, 289 int af, 290 struct secasindex *saidx, 291 int *error 292 ) 293 { 294 #define IPSEC_OSTAT(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \ 295 isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++) 296 struct secasvar *sav; 297 298 IPSEC_SPLASSERT_SOFTNET("ipsec_nextisr"); 299 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 300 ("ipsec_nextisr: invalid address family %u", af)); 301 again: 302 /* 303 * Craft SA index to search for proper SA. Note that 304 * we only fillin unspecified SA peers for transport 305 * mode; for tunnel mode they must already be filled in. 306 */ 307 *saidx = isr->saidx; 308 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 309 /* Fillin unspecified SA peers only for transport mode */ 310 if (af == AF_INET) { 311 struct sockaddr_in *sin; 312 struct ip *ip = mtod(m, struct ip *); 313 314 if (saidx->src.sa.sa_len == 0) { 315 sin = &saidx->src.sin; 316 sin->sin_len = sizeof(*sin); 317 sin->sin_family = AF_INET; 318 sin->sin_port = IPSEC_PORT_ANY; 319 sin->sin_addr = ip->ip_src; 320 } 321 if (saidx->dst.sa.sa_len == 0) { 322 sin = &saidx->dst.sin; 323 sin->sin_len = sizeof(*sin); 324 sin->sin_family = AF_INET; 325 sin->sin_port = IPSEC_PORT_ANY; 326 sin->sin_addr = ip->ip_dst; 327 } 328 } else { 329 struct sockaddr_in6 *sin6; 330 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 331 332 if (saidx->src.sin6.sin6_len == 0) { 333 sin6 = (struct sockaddr_in6 *)&saidx->src; 334 sin6->sin6_len = sizeof(*sin6); 335 sin6->sin6_family = AF_INET6; 336 sin6->sin6_port = IPSEC_PORT_ANY; 337 sin6->sin6_addr = ip6->ip6_src; 338 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 339 /* fix scope id for comparing SPD */ 340 sin6->sin6_addr.s6_addr16[1] = 0; 341 sin6->sin6_scope_id = 342 ntohs(ip6->ip6_src.s6_addr16[1]); 343 } 344 } 345 if (saidx->dst.sin6.sin6_len == 0) { 346 sin6 = (struct sockaddr_in6 *)&saidx->dst; 347 sin6->sin6_len = sizeof(*sin6); 348 sin6->sin6_family = AF_INET6; 349 sin6->sin6_port = IPSEC_PORT_ANY; 350 sin6->sin6_addr = ip6->ip6_dst; 351 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 352 /* fix scope id for comparing SPD */ 353 sin6->sin6_addr.s6_addr16[1] = 0; 354 sin6->sin6_scope_id = 355 ntohs(ip6->ip6_dst.s6_addr16[1]); 356 } 357 } 358 } 359 } 360 361 /* 362 * Lookup SA and validate it. 363 */ 364 *error = key_checkrequest(isr, saidx); 365 if (*error != 0) { 366 /* 367 * IPsec processing is required, but no SA found. 368 * I assume that key_acquire() had been called 369 * to get/establish the SA. Here I discard 370 * this packet because it is responsibility for 371 * upper layer to retransmit the packet. 372 */ 373 newipsecstat.ips_out_nosa++; 374 goto bad; 375 } 376 sav = isr->sav; 377 if (sav == NULL) { /* XXX valid return */ 378 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 379 ("ipsec_nextisr: no SA found, but required; level %u", 380 ipsec_get_reqlevel(isr))); 381 isr = isr->next; 382 if (isr == NULL) { 383 /*XXXstatistic??*/ 384 *error = EINVAL; /*XXX*/ 385 return isr; 386 } 387 goto again; 388 } 389 390 /* 391 * Check system global policy controls. 392 */ 393 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) || 394 (isr->saidx.proto == IPPROTO_AH && !ah_enable) || 395 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) { 396 DPRINTF(("ipsec_nextisr: IPsec outbound packet dropped due" 397 " to policy (check your sysctls)\n")); 398 IPSEC_OSTAT(espstat.esps_pdrops, ahstat.ahs_pdrops, 399 ipcompstat.ipcomps_pdrops); 400 *error = EHOSTUNREACH; 401 goto bad; 402 } 403 404 /* 405 * Sanity check the SA contents for the caller 406 * before they invoke the xform output method. 407 */ 408 if (sav->tdb_xform == NULL) { 409 DPRINTF(("ipsec_nextisr: no transform for SA\n")); 410 IPSEC_OSTAT(espstat.esps_noxform, ahstat.ahs_noxform, 411 ipcompstat.ipcomps_noxform); 412 *error = EHOSTUNREACH; 413 goto bad; 414 } 415 return isr; 416 bad: 417 IPSEC_ASSERT(*error != 0, ("ipsec_nextisr: error return w/ no error code")); 418 return NULL; 419 #undef IPSEC_OSTAT 420 } 421 422 #ifdef INET 423 /* 424 * IPsec output logic for IPv4. 425 */ 426 int 427 ipsec4_process_packet( 428 struct mbuf *m, 429 struct ipsecrequest *isr, 430 int flags, 431 int tunalready 432 ) 433 { 434 struct secasindex saidx; 435 struct secasvar *sav; 436 struct ip *ip; 437 int s, error, i, off; 438 439 IPSEC_ASSERT(m != NULL, ("ipsec4_process_packet: null mbuf")); 440 IPSEC_ASSERT(isr != NULL, ("ipsec4_process_packet: null isr")); 441 442 s = splsoftnet(); /* insure SA contents don't change */ 443 444 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 445 if (isr == NULL) 446 goto bad; 447 448 sav = isr->sav; 449 if (!tunalready) { 450 union sockaddr_union *dst = &sav->sah->saidx.dst; 451 int setdf; 452 453 /* 454 * Collect IP_DF state from the outer header. 455 */ 456 if (dst->sa.sa_family == AF_INET) { 457 if (m->m_len < sizeof (struct ip) && 458 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 459 error = ENOBUFS; 460 goto bad; 461 } 462 ip = mtod(m, struct ip *); 463 /* Honor system-wide control of how to handle IP_DF */ 464 switch (ip4_ipsec_dfbit) { 465 case 0: /* clear in outer header */ 466 case 1: /* set in outer header */ 467 setdf = ip4_ipsec_dfbit; 468 break; 469 default: /* propagate to outer header */ 470 setdf = ip->ip_off; 471 #ifndef __FreeBSD__ 472 /* On FreeBSD, ip_off and ip_len assumed in host endian. */ 473 setdf = ntohs(setdf); 474 #endif 475 setdf = htons(setdf & 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 #ifdef _IP_VHL 504 if (ip->ip_vhl == IP_VHL_BORING) 505 ip->ip_sum = in_cksum_hdr(ip); 506 else 507 ip->ip_sum = in_cksum(m, 508 _IP_VHL_HL(ip->ip_vhl) << 2); 509 #else 510 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 511 #endif 512 513 /* Encapsulate the packet */ 514 error = ipip_output(m, isr, &mp, 0, 0); 515 if (mp == NULL && !error) { 516 /* Should never happen. */ 517 DPRINTF(("ipsec4_process_packet: ipip_output " 518 "returns no mbuf and no error!")); 519 error = EFAULT; 520 } 521 if (error) { 522 if (mp) { 523 /* XXX: Should never happen! */ 524 m_freem(mp); 525 } 526 m = NULL; /* ipip_output() already freed it */ 527 goto bad; 528 } 529 m = mp, mp = NULL; 530 /* 531 * ipip_output clears IP_DF in the new header. If 532 * we need to propagate IP_DF from the outer header, 533 * then we have to do it here. 534 * 535 * XXX shouldn't assume what ipip_output does. 536 */ 537 if (dst->sa.sa_family == AF_INET && setdf) { 538 if (m->m_len < sizeof (struct ip) && 539 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 540 error = ENOBUFS; 541 goto bad; 542 } 543 ip = mtod(m, struct ip *); 544 ip->ip_off |= IP_OFF_CONVERT(IP_DF); 545 } 546 } 547 } 548 549 /* 550 * Dispatch to the appropriate IPsec transform logic. The 551 * packet will be returned for transmission after crypto 552 * processing, etc. are completed. For encapsulation we 553 * bypass this call because of the explicit call done above 554 * (necessary to deal with IP_DF handling for IPv4). 555 * 556 * NB: m & sav are ``passed to caller'' who's reponsible for 557 * for reclaiming their resources. 558 */ 559 if (sav->tdb_xform->xf_type != XF_IP4) { 560 ip = mtod(m, struct ip *); 561 i = ip->ip_hl << 2; 562 off = offsetof(struct ip, ip_p); 563 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 564 } else { 565 error = ipsec_process_done(m, isr); 566 } 567 splx(s); 568 return error; 569 bad: 570 splx(s); 571 if (m) 572 m_freem(m); 573 return error; 574 } 575 #endif 576 577 #ifdef INET6 578 int 579 ipsec6_process_packet( 580 struct mbuf *m, 581 struct ipsecrequest *isr 582 ) 583 { 584 struct secasindex saidx; 585 struct secasvar *sav; 586 struct ip6_hdr *ip6; 587 int s, error, i, off; 588 589 IPSEC_ASSERT(m != NULL, ("ipsec6_process_packet: null mbuf")); 590 IPSEC_ASSERT(isr != NULL, ("ipsec6_process_packet: null isr")); 591 592 s = splsoftnet(); /* insure SA contents don't change */ 593 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 594 if (isr == NULL) { 595 // XXX Should we send a notification ? 596 goto bad; 597 } 598 599 sav = isr->sav; 600 if (sav->tdb_xform->xf_type != XF_IP4) { 601 i = sizeof(struct ip6_hdr); 602 off = offsetof(struct ip6_hdr, ip6_nxt); 603 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 604 } else { 605 union sockaddr_union *dst = &sav->sah->saidx.dst; 606 607 ip6 = mtod(m, struct ip6_hdr *); 608 609 /* Do the appropriate encapsulation, if necessary */ 610 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 611 dst->sa.sa_family != AF_INET6 || /* PF mismatch */ 612 ((dst->sa.sa_family == AF_INET6) && 613 (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) && 614 (!IN6_ARE_ADDR_EQUAL(&dst->sin6.sin6_addr, 615 &ip6->ip6_dst))) 616 ) 617 { 618 struct mbuf *mp; 619 /* Fix IPv6 header payload length. */ 620 if (m->m_len < sizeof(struct ip6_hdr)) 621 if ((m = m_pullup(m,sizeof(struct ip6_hdr))) == NULL) 622 return ENOBUFS; 623 624 if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) { 625 /* No jumbogram support. */ 626 m_freem(m); 627 return ENXIO; /*XXX*/ 628 } 629 ip6 = mtod(m, struct ip6_hdr *); 630 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6)); 631 632 /* Encapsulate the packet */ 633 error = ipip_output(m, isr, &mp, 0, 0); 634 if (mp == NULL && !error) { 635 /* Should never happen. */ 636 DPRINTF(("ipsec6_process_packet: ipip_output " 637 "returns no mbuf and no error!")); 638 error = EFAULT; 639 } 640 641 if (error) { 642 if (mp) { 643 /* XXX: Should never happen! */ 644 m_freem(mp); 645 } 646 m = NULL; /* ipip_output() already freed it */ 647 goto bad; 648 } 649 650 m = mp; 651 mp = NULL; 652 } 653 654 error = ipsec_process_done(m,isr); 655 } 656 splx(s); 657 return error; 658 bad: 659 splx(s); 660 if (m) 661 m_freem(m); 662 return error; 663 } 664 #endif /*INET6*/ 665
Indexes created Sun Sep 21 20:09:37 GMT 2025