1 /* $NetBSD: ipsec_output.c,v 1.24 2007/12/09 18:27:39 degroote 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 1.24 2007/12/09 18:27:39 degroote 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 udp->uh_ulen = htons(m->m_pkthdr.len - (ip->ip_hl << 2)); 160 } 161 #endif /* IPSEC_NAT_T */ 162 163 switch (saidx->dst.sa.sa_family) { 164 #ifdef INET 165 case AF_INET: 166 /* Fix the header length, for AH processing. */ 167 ip = mtod(m, struct ip *); 168 ip->ip_len = htons(m->m_pkthdr.len); 169 #ifdef IPSEC_NAT_T 170 if (sav->natt_type != 0) 171 ip->ip_p = IPPROTO_UDP; 172 #endif /* IPSEC_NAT_T */ 173 break; 174 #endif /* INET */ 175 #ifdef INET6 176 case AF_INET6: 177 /* Fix the header length, for AH processing. */ 178 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 179 error = ENXIO; 180 goto bad; 181 } 182 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 183 /* No jumbogram support. */ 184 error = ENXIO; /*?*/ 185 goto bad; 186 } 187 ip6 = mtod(m, struct ip6_hdr *); 188 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 189 #ifdef IPSEC_NAT_T 190 if (sav->natt_type != 0) 191 ip6->ip6_nxt = IPPROTO_UDP; 192 #endif /* IPSEC_NAT_T */ 193 break; 194 #endif /* INET6 */ 195 default: 196 DPRINTF(("ipsec_process_done: unknown protocol family %u\n", 197 saidx->dst.sa.sa_family)); 198 error = ENXIO; 199 goto bad; 200 } 201 202 /* 203 * Add a record of what we've done or what needs to be done to the 204 * packet. 205 */ 206 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 207 sizeof(struct tdb_ident), M_NOWAIT); 208 if (mtag == NULL) { 209 DPRINTF(("ipsec_process_done: could not get packet tag\n")); 210 error = ENOMEM; 211 goto bad; 212 } 213 214 tdbi = (struct tdb_ident *)(mtag + 1); 215 tdbi->dst = saidx->dst; 216 tdbi->proto = saidx->proto; 217 tdbi->spi = sav->spi; 218 m_tag_prepend(m, mtag); 219 220 /* 221 * If there's another (bundled) SA to apply, do so. 222 * Note that this puts a burden on the kernel stack size. 223 * If this is a problem we'll need to introduce a queue 224 * to set the packet on so we can unwind the stack before 225 * doing further processing. 226 */ 227 if (isr->next) { 228 newipsecstat.ips_out_bundlesa++; 229 switch ( saidx->dst.sa.sa_family ) { 230 #ifdef INET 231 case AF_INET: 232 return ipsec4_process_packet(m, isr->next, 0,0); 233 #endif /* INET */ 234 #ifdef INET6 235 case AF_INET6: 236 return ipsec6_process_packet(m,isr->next); 237 #endif /* INET6 */ 238 default : 239 DPRINTF(("ipsec_process_done: unknown protocol family %u\n", 240 saidx->dst.sa.sa_family)); 241 error = ENXIO; 242 goto bad; 243 } 244 } 245 246 /* 247 * We're done with IPsec processing, transmit the packet using the 248 * appropriate network protocol (IP or IPv6). SPD lookup will be 249 * performed again there. 250 */ 251 switch (saidx->dst.sa.sa_family) { 252 #ifdef INET 253 case AF_INET: 254 ip = mtod(m, struct ip *); 255 #ifdef __FreeBSD__ 256 /* FreeBSD ip_output() expects ip_len, ip_off in host endian */ 257 ip->ip_len = ntohs(ip->ip_len); 258 ip->ip_off = ntohs(ip->ip_off); 259 #endif /* __FreeBSD_ */ 260 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, 261 (struct ip_moptions *)NULL, (struct socket *)NULL); 262 263 #endif /* INET */ 264 #ifdef INET6 265 case AF_INET6: 266 /* 267 * We don't need massage, IPv6 header fields are always in 268 * net endian. 269 */ 270 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 271 #endif /* INET6 */ 272 } 273 panic("ipsec_process_done"); 274 bad: 275 m_freem(m); 276 KEY_FREESAV(&sav); 277 return (error); 278 } 279 280 static struct ipsecrequest * 281 ipsec_nextisr( 282 struct mbuf *m, 283 struct ipsecrequest *isr, 284 int af, 285 struct secasindex *saidx, 286 int *error 287 ) 288 { 289 #define IPSEC_OSTAT(x,y,z) (isr->saidx.proto == IPPROTO_ESP ? (x)++ : \ 290 isr->saidx.proto == IPPROTO_AH ? (y)++ : (z)++) 291 struct secasvar *sav; 292 293 IPSEC_SPLASSERT_SOFTNET("ipsec_nextisr"); 294 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 295 ("ipsec_nextisr: invalid address family %u", af)); 296 again: 297 /* 298 * Craft SA index to search for proper SA. Note that 299 * we only fillin unspecified SA peers for transport 300 * mode; for tunnel mode they must already be filled in. 301 */ 302 *saidx = isr->saidx; 303 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 304 /* Fillin unspecified SA peers only for transport mode */ 305 if (af == AF_INET) { 306 struct sockaddr_in *sin; 307 struct ip *ip = mtod(m, struct ip *); 308 309 if (saidx->src.sa.sa_len == 0) { 310 sin = &saidx->src.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_src; 315 } 316 if (saidx->dst.sa.sa_len == 0) { 317 sin = &saidx->dst.sin; 318 sin->sin_len = sizeof(*sin); 319 sin->sin_family = AF_INET; 320 sin->sin_port = IPSEC_PORT_ANY; 321 sin->sin_addr = ip->ip_dst; 322 } 323 } else { 324 struct sockaddr_in6 *sin6; 325 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 326 327 if (saidx->src.sin6.sin6_len == 0) { 328 sin6 = (struct sockaddr_in6 *)&saidx->src; 329 sin6->sin6_len = sizeof(*sin6); 330 sin6->sin6_family = AF_INET6; 331 sin6->sin6_port = IPSEC_PORT_ANY; 332 sin6->sin6_addr = ip6->ip6_src; 333 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 334 /* fix scope id for comparing SPD */ 335 sin6->sin6_addr.s6_addr16[1] = 0; 336 sin6->sin6_scope_id = 337 ntohs(ip6->ip6_src.s6_addr16[1]); 338 } 339 } 340 if (saidx->dst.sin6.sin6_len == 0) { 341 sin6 = (struct sockaddr_in6 *)&saidx->dst; 342 sin6->sin6_len = sizeof(*sin6); 343 sin6->sin6_family = AF_INET6; 344 sin6->sin6_port = IPSEC_PORT_ANY; 345 sin6->sin6_addr = ip6->ip6_dst; 346 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 347 /* fix scope id for comparing SPD */ 348 sin6->sin6_addr.s6_addr16[1] = 0; 349 sin6->sin6_scope_id = 350 ntohs(ip6->ip6_dst.s6_addr16[1]); 351 } 352 } 353 } 354 } 355 356 /* 357 * Lookup SA and validate it. 358 */ 359 *error = key_checkrequest(isr, saidx); 360 if (*error != 0) { 361 /* 362 * IPsec processing is required, but no SA found. 363 * I assume that key_acquire() had been called 364 * to get/establish the SA. Here I discard 365 * this packet because it is responsibility for 366 * upper layer to retransmit the packet. 367 */ 368 newipsecstat.ips_out_nosa++; 369 goto bad; 370 } 371 sav = isr->sav; 372 if (sav == NULL) { /* XXX valid return */ 373 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 374 ("ipsec_nextisr: no SA found, but required; level %u", 375 ipsec_get_reqlevel(isr))); 376 isr = isr->next; 377 if (isr == NULL) { 378 /*XXXstatistic??*/ 379 *error = EINVAL; /*XXX*/ 380 return isr; 381 } 382 goto again; 383 } 384 385 /* 386 * Check system global policy controls. 387 */ 388 if ((isr->saidx.proto == IPPROTO_ESP && !esp_enable) || 389 (isr->saidx.proto == IPPROTO_AH && !ah_enable) || 390 (isr->saidx.proto == IPPROTO_IPCOMP && !ipcomp_enable)) { 391 DPRINTF(("ipsec_nextisr: IPsec outbound packet dropped due" 392 " to policy (check your sysctls)\n")); 393 IPSEC_OSTAT(espstat.esps_pdrops, ahstat.ahs_pdrops, 394 ipcompstat.ipcomps_pdrops); 395 *error = EHOSTUNREACH; 396 goto bad; 397 } 398 399 /* 400 * Sanity check the SA contents for the caller 401 * before they invoke the xform output method. 402 */ 403 if (sav->tdb_xform == NULL) { 404 DPRINTF(("ipsec_nextisr: no transform for SA\n")); 405 IPSEC_OSTAT(espstat.esps_noxform, ahstat.ahs_noxform, 406 ipcompstat.ipcomps_noxform); 407 *error = EHOSTUNREACH; 408 goto bad; 409 } 410 return isr; 411 bad: 412 IPSEC_ASSERT(*error != 0, ("ipsec_nextisr: error return w/ no error code")); 413 return NULL; 414 #undef IPSEC_OSTAT 415 } 416 417 #ifdef INET 418 /* 419 * IPsec output logic for IPv4. 420 */ 421 int 422 ipsec4_process_packet( 423 struct mbuf *m, 424 struct ipsecrequest *isr, 425 int flags, 426 int tunalready 427 ) 428 { 429 struct secasindex saidx; 430 struct secasvar *sav; 431 struct ip *ip; 432 int s, error, i, off; 433 434 IPSEC_ASSERT(m != NULL, ("ipsec4_process_packet: null mbuf")); 435 IPSEC_ASSERT(isr != NULL, ("ipsec4_process_packet: null isr")); 436 437 s = splsoftnet(); /* insure SA contents don't change */ 438 439 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 440 if (isr == NULL) 441 goto bad; 442 443 sav = isr->sav; 444 if (!tunalready) { 445 union sockaddr_union *dst = &sav->sah->saidx.dst; 446 int setdf; 447 448 /* 449 * Collect IP_DF state from the outer header. 450 */ 451 if (dst->sa.sa_family == AF_INET) { 452 if (m->m_len < sizeof (struct ip) && 453 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 454 error = ENOBUFS; 455 goto bad; 456 } 457 ip = mtod(m, struct ip *); 458 /* Honor system-wide control of how to handle IP_DF */ 459 switch (ip4_ipsec_dfbit) { 460 case 0: /* clear in outer header */ 461 case 1: /* set in outer header */ 462 setdf = ip4_ipsec_dfbit; 463 break; 464 default: /* propagate to outer header */ 465 setdf = ip->ip_off; 466 #ifndef __FreeBSD__ 467 /* On FreeBSD, ip_off and ip_len assumed in host endian. */ 468 setdf = ntohs(setdf); 469 #endif 470 setdf = htons(setdf & IP_DF); 471 break; 472 } 473 } else { 474 ip = NULL; /* keep compiler happy */ 475 setdf = 0; 476 } 477 /* Do the appropriate encapsulation, if necessary */ 478 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 479 dst->sa.sa_family != AF_INET || /* PF mismatch */ 480 #if 0 481 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 482 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 483 #endif 484 (dst->sa.sa_family == AF_INET && /* Proxy */ 485 dst->sin.sin_addr.s_addr != INADDR_ANY && 486 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 487 struct mbuf *mp; 488 489 /* Fix IPv4 header checksum and length */ 490 if (m->m_len < sizeof (struct ip) && 491 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 492 error = ENOBUFS; 493 goto bad; 494 } 495 ip = mtod(m, struct ip *); 496 ip->ip_len = htons(m->m_pkthdr.len); 497 ip->ip_sum = 0; 498 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 499 500 /* Encapsulate the packet */ 501 error = ipip_output(m, isr, &mp, 0, 0); 502 if (mp == NULL && !error) { 503 /* Should never happen. */ 504 DPRINTF(("ipsec4_process_packet: ipip_output " 505 "returns no mbuf and no error!")); 506 error = EFAULT; 507 } 508 if (error) { 509 if (mp) { 510 /* XXX: Should never happen! */ 511 m_freem(mp); 512 } 513 m = NULL; /* ipip_output() already freed it */ 514 goto bad; 515 } 516 m = mp, mp = NULL; 517 /* 518 * ipip_output clears IP_DF in the new header. If 519 * we need to propagate IP_DF from the outer header, 520 * then we have to do it here. 521 * 522 * XXX shouldn't assume what ipip_output does. 523 */ 524 if (dst->sa.sa_family == AF_INET && setdf) { 525 if (m->m_len < sizeof (struct ip) && 526 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 527 error = ENOBUFS; 528 goto bad; 529 } 530 ip = mtod(m, struct ip *); 531 ip->ip_off |= IP_OFF_CONVERT(IP_DF); 532 } 533 } 534 } 535 536 /* 537 * Dispatch to the appropriate IPsec transform logic. The 538 * packet will be returned for transmission after crypto 539 * processing, etc. are completed. For encapsulation we 540 * bypass this call because of the explicit call done above 541 * (necessary to deal with IP_DF handling for IPv4). 542 * 543 * NB: m & sav are ``passed to caller'' who's reponsible for 544 * for reclaiming their resources. 545 */ 546 if (sav->tdb_xform->xf_type != XF_IP4) { 547 ip = mtod(m, struct ip *); 548 i = ip->ip_hl << 2; 549 off = offsetof(struct ip, ip_p); 550 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 551 } else { 552 error = ipsec_process_done(m, isr); 553 } 554 splx(s); 555 return error; 556 bad: 557 splx(s); 558 if (m) 559 m_freem(m); 560 return error; 561 } 562 #endif 563 564 #ifdef INET6 565 int 566 ipsec6_process_packet( 567 struct mbuf *m, 568 struct ipsecrequest *isr 569 ) 570 { 571 struct secasindex saidx; 572 struct secasvar *sav; 573 struct ip6_hdr *ip6; 574 int s, error, i, off; 575 576 IPSEC_ASSERT(m != NULL, ("ipsec6_process_packet: null mbuf")); 577 IPSEC_ASSERT(isr != NULL, ("ipsec6_process_packet: null isr")); 578 579 s = splsoftnet(); /* insure SA contents don't change */ 580 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 581 if (isr == NULL) { 582 // XXX Should we send a notification ? 583 goto bad; 584 } 585 586 sav = isr->sav; 587 if (sav->tdb_xform->xf_type != XF_IP4) { 588 i = sizeof(struct ip6_hdr); 589 off = offsetof(struct ip6_hdr, ip6_nxt); 590 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 591 } else { 592 union sockaddr_union *dst = &sav->sah->saidx.dst; 593 594 ip6 = mtod(m, struct ip6_hdr *); 595 596 /* Do the appropriate encapsulation, if necessary */ 597 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 598 dst->sa.sa_family != AF_INET6 || /* PF mismatch */ 599 ((dst->sa.sa_family == AF_INET6) && 600 (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) && 601 (!IN6_ARE_ADDR_EQUAL(&dst->sin6.sin6_addr, 602 &ip6->ip6_dst))) 603 ) 604 { 605 struct mbuf *mp; 606 /* Fix IPv6 header payload length. */ 607 if (m->m_len < sizeof(struct ip6_hdr)) 608 if ((m = m_pullup(m,sizeof(struct ip6_hdr))) == NULL) 609 return ENOBUFS; 610 611 if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) { 612 /* No jumbogram support. */ 613 m_freem(m); 614 return ENXIO; /*XXX*/ 615 } 616 ip6 = mtod(m, struct ip6_hdr *); 617 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6)); 618 619 /* Encapsulate the packet */ 620 error = ipip_output(m, isr, &mp, 0, 0); 621 if (mp == NULL && !error) { 622 /* Should never happen. */ 623 DPRINTF(("ipsec6_process_packet: ipip_output " 624 "returns no mbuf and no error!")); 625 error = EFAULT; 626 } 627 628 if (error) { 629 if (mp) { 630 /* XXX: Should never happen! */ 631 m_freem(mp); 632 } 633 m = NULL; /* ipip_output() already freed it */ 634 goto bad; 635 } 636 637 m = mp; 638 mp = NULL; 639 } 640 641 error = ipsec_process_done(m,isr); 642 } 643 splx(s); 644 return error; 645 bad: 646 splx(s); 647 if (m) 648 m_freem(m); 649 return error; 650 } 651 #endif /*INET6*/ 652