sys/netipsec/ipsec_output.c

   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/if_var.h>
  48 #include <net/pfil.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 #include <netinet6/scope6_var.h>
  65 #endif
  66 #include <netinet/in_pcb.h>
  67 #ifdef INET6
  68 #include <netinet/icmp6.h>
  69 #endif
  70
  71 #include <netipsec/ipsec.h>
  72 #ifdef INET6
  73 #include <netipsec/ipsec6.h>
  74 #endif
  75 #include <netipsec/ah_var.h>
  76 #include <netipsec/esp_var.h>
  77 #include <netipsec/ipcomp_var.h>
  78
  79 #include <netipsec/xform.h>
  80
  81 #include <netipsec/key.h>
  82 #include <netipsec/keydb.h>
  83 #include <netipsec/key_debug.h>
  84
  85 #include <machine/in_cksum.h>
  86
  87 #ifdef IPSEC_NAT_T
  88 #include <netinet/udp.h>
  89 #endif
  90
  91 #ifdef DEV_ENC
  92 #include <net/if_enc.h>
  93 #endif
  94
  95
  96 int
  97 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr)
  98 {
  99         struct tdb_ident *tdbi;
 100         struct m_tag *mtag;
 101         struct secasvar *sav;
 102         struct secasindex *saidx;
 103         int error;
 104
 105         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 106         IPSEC_ASSERT(isr != NULL, ("null ISR"));
 107         IPSEC_ASSERT(isr->sp != NULL, ("NULL isr->sp"));
 108         sav = isr->sav;
 109         IPSEC_ASSERT(sav != NULL, ("null SA"));
 110         IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
 111
 112         saidx = &sav->sah->saidx;
 113         switch (saidx->dst.sa.sa_family) {
 114 #ifdef INET
 115         case AF_INET:
 116                 /* Fix the header length, for AH processing. */
 117                 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
 118                 break;
 119 #endif /* INET */
 120 #ifdef INET6
 121         case AF_INET6:
 122                 /* Fix the header length, for AH processing. */
 123                 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) {
 124                         error = ENXIO;
 125                         goto bad;
 126                 }
 127                 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) {
 128                         /* No jumbogram support. */
 129                         error = ENXIO;  /*?*/
 130                         goto bad;
 131                 }
 132                 mtod(m, struct ip6_hdr *)->ip6_plen =
 133                         htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
 134                 break;
 135 #endif /* INET6 */
 136         default:
 137                 DPRINTF(("%s: unknown protocol family %u\n", __func__,
 138                     saidx->dst.sa.sa_family));
 139                 error = ENXIO;
 140                 goto bad;
 141         }
 142
 143         /*
 144          * Add a record of what we've done or what needs to be done to the
 145          * packet.
 146          */
 147         mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE,
 148                         sizeof(struct tdb_ident), M_NOWAIT);
 149         if (mtag == NULL) {
 150                 DPRINTF(("%s: could not get packet tag\n", __func__));
 151                 error = ENOMEM;
 152                 goto bad;
 153         }
 154
 155         tdbi = (struct tdb_ident *)(mtag + 1);
 156         tdbi->dst = saidx->dst;
 157         tdbi->proto = saidx->proto;
 158         tdbi->spi = sav->spi;
 159         m_tag_prepend(m, mtag);
 160
 161         /*
 162          * If there's another (bundled) SA to apply, do so.
 163          * Note that this puts a burden on the kernel stack size.
 164          * If this is a problem we'll need to introduce a queue
 165          * to set the packet on so we can unwind the stack before
 166          * doing further processing.
 167          *
 168          * If ipsec[46]_process_packet() will successfully queue
 169          * the request, we need to take additional reference to SP,
 170          * because xform callback will release reference.
 171          */
 172         if (isr->next) {
 173                 /* XXX-BZ currently only support same AF bundles. */
 174                 switch (saidx->dst.sa.sa_family) {
 175 #ifdef INET
 176                 case AF_INET:
 177                         IPSECSTAT_INC(ips_out_bundlesa);
 178                         key_addref(isr->sp);
 179                         error = ipsec4_process_packet(m, isr->next);
 180                         if (error != 0)
 181                                 KEY_FREESP(&isr->sp);
 182                         return (error);
 183                         /* NOTREACHED */
 184 #endif
 185 #ifdef notyet
 186 #ifdef INET6
 187                 case AF_INET6:
 188                         /* XXX */
 189                         IPSEC6STAT_INC(ips_out_bundlesa);
 190                         key_addref(isr->sp);
 191                         error = ipsec6_process_packet(m, isr->next);
 192                         if (error != 0)
 193                                 KEY_FREESP(&isr->sp);
 194                         return (error);
 195                         /* NOTREACHED */
 196 #endif /* INET6 */
 197 #endif
 198                 default:
 199                         DPRINTF(("%s: unknown protocol family %u\n", __func__,
 200                             saidx->dst.sa.sa_family));
 201                         error = ENXIO;
 202                         goto bad;
 203                 }
 204         }
 205         key_sa_recordxfer(sav, m);              /* record data transfer */
 206
 207         /*
 208          * We're done with IPsec processing, transmit the packet using the
 209          * appropriate network protocol (IP or IPv6).
 210          */
 211         switch (saidx->dst.sa.sa_family) {
 212 #ifdef INET
 213         case AF_INET:
 214 #ifdef IPSEC_NAT_T
 215                 /*
 216                  * If NAT-T is enabled, now that all IPsec processing is done
 217                  * insert UDP encapsulation header after IP header.
 218                  */
 219                 if (sav->natt_type) {
 220                         struct ip *ip = mtod(m, struct ip *);
 221                         const int hlen = (ip->ip_hl << 2);
 222                         int size, off;
 223                         struct mbuf *mi;
 224                         struct udphdr *udp;
 225
 226                         size = sizeof(struct udphdr);
 227                         if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) {
 228                                 /*
 229                                  * draft-ietf-ipsec-nat-t-ike-0[01].txt and
 230                                  * draft-ietf-ipsec-udp-encaps-(00/)01.txt,
 231                                  * ignoring possible AH mode
 232                                  * non-IKE marker + non-ESP marker
 233                                  * from draft-ietf-ipsec-udp-encaps-00.txt.
 234                                  */
 235                                 size += sizeof(u_int64_t);
 236                         }
 237                         mi = m_makespace(m, hlen, size, &off);
 238                         if (mi == NULL) {
 239                                 DPRINTF(("%s: m_makespace for udphdr failed\n",
 240                                     __func__));
 241                                 error = ENOBUFS;
 242                                 goto bad;
 243                         }
 244
 245                         udp = (struct udphdr *)(mtod(mi, caddr_t) + off);
 246                         if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE)
 247                                 udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT);
 248                         else
 249                                 udp->uh_sport =
 250                                         KEY_PORTFROMSADDR(&sav->sah->saidx.src);
 251                         udp->uh_dport = KEY_PORTFROMSADDR(&sav->sah->saidx.dst);
 252                         udp->uh_sum = 0;
 253                         udp->uh_ulen = htons(m->m_pkthdr.len - hlen);
 254                         ip->ip_len = htons(m->m_pkthdr.len);
 255                         ip->ip_p = IPPROTO_UDP;
 256
 257                         if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE)
 258                                 *(u_int64_t *)(udp + 1) = 0;
 259                 }
 260 #endif /* IPSEC_NAT_T */
 261
 262                 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL);
 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         return (error);
 277 }
 278
 279 static struct ipsecrequest *
 280 ipsec_nextisr(
 281         struct mbuf *m,
 282         struct ipsecrequest *isr,
 283         int af,
 284         struct secasindex *saidx,
 285         int *error
 286 )
 287 {
 288 #define IPSEC_OSTAT(name)       do {            \
 289         if (isr->saidx.proto == IPPROTO_ESP)    \
 290                 ESPSTAT_INC(esps_##name);       \
 291         else if (isr->saidx.proto == IPPROTO_AH)\
 292                 AHSTAT_INC(ahs_##name);         \
 293         else                                    \
 294                 IPCOMPSTAT_INC(ipcomps_##name); \
 295 } while (0)
 296         struct secasvar *sav;
 297
 298         IPSECREQUEST_LOCK_ASSERT(isr);
 299
 300         IPSEC_ASSERT(af == AF_INET || af == AF_INET6,
 301                 ("invalid address family %u", af));
 302 again:
 303         /*
 304          * Craft SA index to search for proper SA.  Note that
 305          * we only fillin unspecified SA peers for transport
 306          * mode; for tunnel mode they must already be filled in.
 307          */
 308         *saidx = isr->saidx;
 309         if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) {
 310                 /* Fillin unspecified SA peers only for transport mode */
 311                 if (af == AF_INET) {
 312                         struct sockaddr_in *sin;
 313                         struct ip *ip = mtod(m, struct ip *);
 314
 315                         if (saidx->src.sa.sa_len == 0) {
 316                                 sin = &saidx->src.sin;
 317                                 sin->sin_len = sizeof(*sin);
 318                                 sin->sin_family = AF_INET;
 319                                 sin->sin_port = IPSEC_PORT_ANY;
 320                                 sin->sin_addr = ip->ip_src;
 321                         }
 322                         if (saidx->dst.sa.sa_len == 0) {
 323                                 sin = &saidx->dst.sin;
 324                                 sin->sin_len = sizeof(*sin);
 325                                 sin->sin_family = AF_INET;
 326                                 sin->sin_port = IPSEC_PORT_ANY;
 327                                 sin->sin_addr = ip->ip_dst;
 328                         }
 329                 } else {
 330                         struct sockaddr_in6 *sin6;
 331                         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 332
 333                         if (saidx->src.sin6.sin6_len == 0) {
 334                                 sin6 = (struct sockaddr_in6 *)&saidx->src;
 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_src;
 339                                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
 340                                         /* fix scope id for comparing SPD */
 341                                         sin6->sin6_addr.s6_addr16[1] = 0;
 342                                         sin6->sin6_scope_id =
 343                                             ntohs(ip6->ip6_src.s6_addr16[1]);
 344                                 }
 345                         }
 346                         if (saidx->dst.sin6.sin6_len == 0) {
 347                                 sin6 = (struct sockaddr_in6 *)&saidx->dst;
 348                                 sin6->sin6_len = sizeof(*sin6);
 349                                 sin6->sin6_family = AF_INET6;
 350                                 sin6->sin6_port = IPSEC_PORT_ANY;
 351                                 sin6->sin6_addr = ip6->ip6_dst;
 352                                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
 353                                         /* fix scope id for comparing SPD */
 354                                         sin6->sin6_addr.s6_addr16[1] = 0;
 355                                         sin6->sin6_scope_id =
 356                                             ntohs(ip6->ip6_dst.s6_addr16[1]);
 357                                 }
 358                         }
 359                 }
 360         }
 361
 362         /*
 363          * Lookup SA and validate it.
 364          */
 365         *error = key_checkrequest(isr, saidx);
 366         if (*error != 0) {
 367                 /*
 368                  * IPsec processing is required, but no SA found.
 369                  * I assume that key_acquire() had been called
 370                  * to get/establish the SA. Here I discard
 371                  * this packet because it is responsibility for
 372                  * upper layer to retransmit the packet.
 373                  */
 374                 switch(af) {
 375                 case AF_INET:
 376                         IPSECSTAT_INC(ips_out_nosa);
 377                         break;
 378 #ifdef INET6
 379                 case AF_INET6:
 380                         IPSEC6STAT_INC(ips_out_nosa);
 381                         break;
 382 #endif
 383                 }
 384                 goto bad;
 385         }
 386         sav = isr->sav;
 387         if (sav == NULL) {
 388                 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE,
 389                         ("no SA found, but required; level %u",
 390                         ipsec_get_reqlevel(isr)));
 391                 IPSECREQUEST_UNLOCK(isr);
 392                 isr = isr->next;
 393                 /*
 394                  * If isr is NULL, we found a 'use' policy w/o SA.
 395                  * Return w/o error and w/o isr so we can drop out
 396                  * and continue w/o IPsec processing.
 397                  */
 398                 if (isr == NULL)
 399                         return isr;
 400                 IPSECREQUEST_LOCK(isr);
 401                 goto again;
 402         }
 403
 404         /*
 405          * Check system global policy controls.
 406          */
 407         if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) ||
 408             (isr->saidx.proto == IPPROTO_AH && !V_ah_enable) ||
 409             (isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) {
 410                 DPRINTF(("%s: IPsec outbound packet dropped due"
 411                         " to policy (check your sysctls)\n", __func__));
 412                 IPSEC_OSTAT(pdrops);
 413                 *error = EHOSTUNREACH;
 414                 goto bad;
 415         }
 416
 417         /*
 418          * Sanity check the SA contents for the caller
 419          * before they invoke the xform output method.
 420          */
 421         if (sav->tdb_xform == NULL) {
 422                 DPRINTF(("%s: no transform for SA\n", __func__));
 423                 IPSEC_OSTAT(noxform);
 424                 *error = EHOSTUNREACH;
 425                 goto bad;
 426         }
 427         return isr;
 428 bad:
 429         IPSEC_ASSERT(*error != 0, ("error return w/ no error code"));
 430         IPSECREQUEST_UNLOCK(isr);
 431         return NULL;
 432 #undef IPSEC_OSTAT
 433 }
 434
 435 static int
 436 ipsec_encap(struct mbuf **mp, struct secasindex *saidx)
 437 {
 438 #ifdef INET6
 439         struct ip6_hdr *ip6;
 440 #endif
 441         struct ip *ip;
 442         int setdf;
 443         uint8_t itos, proto;
 444
 445         ip = mtod(*mp, struct ip *);
 446         switch (ip->ip_v) {
 447 #ifdef INET
 448         case IPVERSION:
 449                 proto = IPPROTO_IPIP;
 450                 /*
 451                  * Collect IP_DF state from the inner header
 452                  * and honor system-wide control of how to handle it.
 453                  */
 454                 switch (V_ip4_ipsec_dfbit) {
 455                 case 0: /* clear in outer header */
 456                 case 1: /* set in outer header */
 457                         setdf = V_ip4_ipsec_dfbit;
 458                         break;
 459                 default:/* propagate to outer header */
 460                         setdf = (ip->ip_off & ntohs(IP_DF)) != 0;
 461                 }
 462                 itos = ip->ip_tos;
 463                 break;
 464 #endif
 465 #ifdef INET6
 466         case (IPV6_VERSION >> 4):
 467                 proto = IPPROTO_IPV6;
 468                 ip6 = mtod(*mp, struct ip6_hdr *);
 469                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
 470                 setdf = V_ip4_ipsec_dfbit ? 1: 0;
 471                 /* scoped address handling */
 472                 in6_clearscope(&ip6->ip6_src);
 473                 in6_clearscope(&ip6->ip6_dst);
 474                 break;
 475 #endif
 476         default:
 477                 return (EAFNOSUPPORT);
 478         }
 479         switch (saidx->dst.sa.sa_family) {
 480 #ifdef INET
 481         case AF_INET:
 482                 if (saidx->src.sa.sa_family != AF_INET ||
 483                     saidx->src.sin.sin_addr.s_addr == INADDR_ANY ||
 484                     saidx->dst.sin.sin_addr.s_addr == INADDR_ANY)
 485                         return (EINVAL);
 486                 M_PREPEND(*mp, sizeof(struct ip), M_NOWAIT);
 487                 if (*mp == NULL)
 488                         return (ENOBUFS);
 489                 ip = mtod(*mp, struct ip *);
 490                 ip->ip_v = IPVERSION;
 491                 ip->ip_hl = sizeof(struct ip) >> 2;
 492                 ip->ip_p = proto;
 493                 ip->ip_len = htons((*mp)->m_pkthdr.len);
 494                 ip->ip_ttl = V_ip_defttl;
 495                 ip->ip_sum = 0;
 496                 ip->ip_off = setdf ? htons(IP_DF): 0;
 497                 ip->ip_src = saidx->src.sin.sin_addr;
 498                 ip->ip_dst = saidx->dst.sin.sin_addr;
 499                 ip_ecn_ingress(V_ip4_ipsec_ecn, &ip->ip_tos, &itos);
 500                 ip_fillid(ip);
 501                 break;
 502 #endif /* INET */
 503 #ifdef INET6
 504         case AF_INET6:
 505                 if (saidx->src.sa.sa_family != AF_INET6 ||
 506                     IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr) ||
 507                     IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr))
 508                         return (EINVAL);
 509                 M_PREPEND(*mp, sizeof(struct ip6_hdr), M_NOWAIT);
 510                 if (*mp == NULL)
 511                         return (ENOBUFS);
 512                 ip6 = mtod(*mp, struct ip6_hdr *);
 513                 ip6->ip6_flow = 0;
 514                 ip6->ip6_vfc = IPV6_VERSION;
 515                 ip6->ip6_hlim = V_ip6_defhlim;
 516                 ip6->ip6_nxt = proto;
 517                 ip6->ip6_dst = saidx->dst.sin6.sin6_addr;
 518                 /* For link-local address embed scope zone id */
 519                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
 520                         ip6->ip6_dst.s6_addr16[1] =
 521                             htons(saidx->dst.sin6.sin6_scope_id & 0xffff);
 522                 ip6->ip6_src = saidx->src.sin6.sin6_addr;
 523                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
 524                         ip6->ip6_src.s6_addr16[1] =
 525                             htons(saidx->src.sin6.sin6_scope_id & 0xffff);
 526                 ip6->ip6_plen = htons((*mp)->m_pkthdr.len - sizeof(*ip6));
 527                 ip_ecn_ingress(V_ip6_ipsec_ecn, &proto, &itos);
 528                 ip6->ip6_flow |= htonl((uint32_t)proto << 20);
 529                 break;
 530 #endif /* INET6 */
 531         default:
 532                 return (EAFNOSUPPORT);
 533         }
 534         return (0);
 535 }
 536
 537 #ifdef INET
 538 /*
 539  * IPsec output logic for IPv4.
 540  */
 541 int
 542 ipsec4_process_packet(struct mbuf *m, struct ipsecrequest *isr)
 543 {
 544         char sbuf[INET6_ADDRSTRLEN], dbuf[INET6_ADDRSTRLEN];
 545         union sockaddr_union *dst;
 546         struct secasindex saidx;
 547         struct secasvar *sav;
 548         struct ip *ip;
 549         int error, i, off;
 550
 551         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 552         IPSEC_ASSERT(isr != NULL, ("null isr"));
 553
 554         IPSECREQUEST_LOCK(isr);         /* insure SA contents don't change */
 555
 556         isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error);
 557         if (isr == NULL) {
 558                 if (error != 0)
 559                         goto bad;
 560                 return EJUSTRETURN;
 561         }
 562
 563         sav = isr->sav;
 564         if (m->m_len < sizeof(struct ip) &&
 565             (m = m_pullup(m, sizeof (struct ip))) == NULL) {
 566                 error = ENOBUFS;
 567                 goto bad;
 568         }
 569         ip = mtod(m, struct ip *);
 570         dst = &sav->sah->saidx.dst;
 571 #ifdef DEV_ENC
 572         if_inc_counter(encif, IFCOUNTER_OPACKETS, 1);
 573         if_inc_counter(encif, IFCOUNTER_OBYTES, m->m_pkthdr.len);
 574
 575         /* pass the mbuf to enc0 for bpf processing */
 576         ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE);
 577         /* pass the mbuf to enc0 for packet filtering */
 578         if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
 579                 goto bad;
 580         ip = mtod(m, struct ip *);
 581 #endif
 582         /* Do the appropriate encapsulation, if necessary */
 583         if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
 584             dst->sa.sa_family != AF_INET ||         /* PF mismatch */
 585             (dst->sa.sa_family == AF_INET &&        /* Proxy */
 586              dst->sin.sin_addr.s_addr != INADDR_ANY &&
 587              dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) {
 588                 /* Fix IPv4 header checksum and length */
 589                 ip->ip_len = htons(m->m_pkthdr.len);
 590                 ip->ip_sum = 0;
 591                 ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
 592                 error = ipsec_encap(&m, &sav->sah->saidx);
 593                 if (error != 0) {
 594                         DPRINTF(("%s: encapsulation for SA %s->%s "
 595                             "SPI 0x%08x failed with error %d\n", __func__,
 596                             ipsec_address(&sav->sah->saidx.src, sbuf,
 597                                 sizeof(sbuf)),
 598                             ipsec_address(&sav->sah->saidx.dst, dbuf,
 599                                 sizeof(dbuf)), ntohl(sav->spi), error));
 600                         goto bad;
 601                 }
 602         }
 603 #ifdef DEV_ENC
 604         /* pass the mbuf to enc0 for bpf processing */
 605         ipsec_bpf(m, sav, sav->sah->saidx.dst.sa.sa_family, ENC_OUT|ENC_AFTER);
 606         /* pass the mbuf to enc0 for packet filtering */
 607         if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
 608                 goto bad;
 609 #endif
 610
 611         /*
 612          * Dispatch to the appropriate IPsec transform logic.  The
 613          * packet will be returned for transmission after crypto
 614          * processing, etc. are completed.
 615          *
 616          * NB: m & sav are ``passed to caller'' who's reponsible for
 617          *     for reclaiming their resources.
 618          */
 619         switch(dst->sa.sa_family) {
 620         case AF_INET:
 621                 ip = mtod(m, struct ip *);
 622                 i = ip->ip_hl << 2;
 623                 off = offsetof(struct ip, ip_p);
 624                 break;
 625 #ifdef INET6
 626         case AF_INET6:
 627                 i = sizeof(struct ip6_hdr);
 628                 off = offsetof(struct ip6_hdr, ip6_nxt);
 629                 break;
 630 #endif /* INET6 */
 631         default:
 632                 DPRINTF(("%s: unsupported protocol family %u\n",
 633                     __func__, dst->sa.sa_family));
 634                 error = EPFNOSUPPORT;
 635                 IPSECSTAT_INC(ips_out_inval);
 636                 goto bad;
 637         }
 638         error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
 639         IPSECREQUEST_UNLOCK(isr);
 640         return (error);
 641 bad:
 642         if (isr)
 643                 IPSECREQUEST_UNLOCK(isr);
 644         if (m)
 645                 m_freem(m);
 646         return error;
 647 }
 648 #endif
 649
 650
 651 #ifdef INET6
 652 static int
 653 in6_sa_equal_addrwithscope(const struct sockaddr_in6 *sa, const struct in6_addr *ia)
 654 {
 655         struct in6_addr ia2;
 656
 657         memcpy(&ia2, &sa->sin6_addr, sizeof(ia2));
 658         if (IN6_IS_SCOPE_LINKLOCAL(&sa->sin6_addr))
 659                 ia2.s6_addr16[1] = htons(sa->sin6_scope_id);
 660
 661         return IN6_ARE_ADDR_EQUAL(ia, &ia2);
 662 }
 663
 664 /*
 665  * IPsec output logic for IPv6.
 666  */
 667 int
 668 ipsec6_process_packet(struct mbuf *m, struct ipsecrequest *isr)
 669 {
 670         char sbuf[INET6_ADDRSTRLEN], dbuf[INET6_ADDRSTRLEN];
 671         struct secasindex saidx;
 672         struct secasvar *sav;
 673         struct ip6_hdr *ip6;
 674         int error, i, off;
 675         union sockaddr_union *dst;
 676
 677         IPSEC_ASSERT(m != NULL, ("ipsec6_process_packet: null mbuf"));
 678         IPSEC_ASSERT(isr != NULL, ("ipsec6_process_packet: null isr"));
 679
 680         IPSECREQUEST_LOCK(isr);         /* insure SA contents don't change */
 681
 682         isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
 683         if (isr == NULL) {
 684                 if (error != 0)
 685                         goto bad;
 686                 return EJUSTRETURN;
 687         }
 688         sav = isr->sav;
 689         dst = &sav->sah->saidx.dst;
 690
 691         ip6 = mtod(m, struct ip6_hdr *);
 692         ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6));
 693 #ifdef DEV_ENC
 694         if_inc_counter(encif, IFCOUNTER_OPACKETS, 1);
 695         if_inc_counter(encif, IFCOUNTER_OBYTES, m->m_pkthdr.len);
 696
 697         /* pass the mbuf to enc0 for bpf processing */
 698         ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE);
 699         /* pass the mbuf to enc0 for packet filtering */
 700         if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
 701                 goto bad;
 702         ip6 = mtod(m, struct ip6_hdr *);
 703 #endif /* DEV_ENC */
 704
 705         /* Do the appropriate encapsulation, if necessary */
 706         if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
 707             dst->sa.sa_family != AF_INET6 ||        /* PF mismatch */
 708             ((dst->sa.sa_family == AF_INET6) &&
 709              (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) &&
 710              (!in6_sa_equal_addrwithscope(&dst->sin6,
 711                                   &ip6->ip6_dst)))) {
 712                 if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) {
 713                         /* No jumbogram support. */
 714                         error = ENXIO;   /*XXX*/
 715                         goto bad;
 716                 }
 717                 error = ipsec_encap(&m, &sav->sah->saidx);
 718                 if (error != 0) {
 719                         DPRINTF(("%s: encapsulation for SA %s->%s "
 720                             "SPI 0x%08x failed with error %d\n", __func__,
 721                             ipsec_address(&sav->sah->saidx.src, sbuf,
 722                                 sizeof(sbuf)),
 723                             ipsec_address(&sav->sah->saidx.dst, dbuf,
 724                                 sizeof(dbuf)), ntohl(sav->spi), error));
 725                         goto bad;
 726                 }
 727         }
 728
 729 #ifdef DEV_ENC
 730         ipsec_bpf(m, isr->sav, dst->sa.sa_family, ENC_OUT|ENC_AFTER);
 731         /* pass the mbuf to enc0 for packet filtering */
 732         if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
 733                 goto bad;
 734 #endif /* DEV_ENC */
 735
 736         switch(dst->sa.sa_family) {
 737 #ifdef INET
 738         case AF_INET:
 739                 {
 740                 struct ip *ip;
 741                 ip = mtod(m, struct ip *);
 742                 i = ip->ip_hl << 2;
 743                 off = offsetof(struct ip, ip_p);
 744                 }
 745                 break;
 746 #endif /* AF_INET */
 747         case AF_INET6:
 748                 i = sizeof(struct ip6_hdr);
 749                 off = offsetof(struct ip6_hdr, ip6_nxt);
 750                 break;
 751         default:
 752                 DPRINTF(("%s: unsupported protocol family %u\n",
 753                                  __func__, dst->sa.sa_family));
 754                 error = EPFNOSUPPORT;
 755                 IPSEC6STAT_INC(ips_out_inval);
 756                 goto bad;
 757         }
 758         error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
 759         IPSECREQUEST_UNLOCK(isr);
 760         return error;
 761 bad:
 762
 763         if (isr)
 764                 IPSECREQUEST_UNLOCK(isr);
 765         if (m)
 766                 m_freem(m);
 767         return error;
 768 }
 769 #endif /*INET6*/