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/pfil.h>
  48 #include <net/vnet.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 IPSEC_NAT_T
  86 #include <netinet/udp.h>
  87 #endif
  88
  89 #ifdef DEV_ENC
  90 #include <net/if_enc.h>
  91 #endif
  92
  93
  94 int
  95 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr)
  96 {
  97         struct tdb_ident *tdbi;
  98         struct m_tag *mtag;
  99         struct secasvar *sav;
 100         struct secasindex *saidx;
 101         int error;
 102
 103         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 104         IPSEC_ASSERT(isr != NULL, ("null ISR"));
 105         sav = isr->sav;
 106         IPSEC_ASSERT(sav != NULL, ("null SA"));
 107         IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
 108
 109         saidx = &sav->sah->saidx;
 110         switch (saidx->dst.sa.sa_family) {
 111 #ifdef INET
 112         case AF_INET:
 113                 /* Fix the header length, for AH processing. */
 114                 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
 115                 break;
 116 #endif /* INET */
 117 #ifdef INET6
 118         case AF_INET6:
 119                 /* Fix the header length, for AH processing. */
 120                 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) {
 121                         error = ENXIO;
 122                         goto bad;
 123                 }
 124                 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) {
 125                         /* No jumbogram support. */
 126                         error = ENXIO;  /*?*/
 127                         goto bad;
 128                 }
 129                 mtod(m, struct ip6_hdr *)->ip6_plen =
 130                         htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
 131                 break;
 132 #endif /* INET6 */
 133         default:
 134                 DPRINTF(("%s: unknown protocol family %u\n", __func__,
 135                     saidx->dst.sa.sa_family));
 136                 error = ENXIO;
 137                 goto bad;
 138         }
 139
 140         /*
 141          * Add a record of what we've done or what needs to be done to the
 142          * packet.
 143          */
 144         mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE,
 145                         sizeof(struct tdb_ident), M_NOWAIT);
 146         if (mtag == NULL) {
 147                 DPRINTF(("%s: could not get packet tag\n", __func__));
 148                 error = ENOMEM;
 149                 goto bad;
 150         }
 151
 152         tdbi = (struct tdb_ident *)(mtag + 1);
 153         tdbi->dst = saidx->dst;
 154         tdbi->proto = saidx->proto;
 155         tdbi->spi = sav->spi;
 156         m_tag_prepend(m, mtag);
 157
 158         /*
 159          * If there's another (bundled) SA to apply, do so.
 160          * Note that this puts a burden on the kernel stack size.
 161          * If this is a problem we'll need to introduce a queue
 162          * to set the packet on so we can unwind the stack before
 163          * doing further processing.
 164          */
 165         if (isr->next) {
 166                 /* XXX-BZ currently only support same AF bundles. */
 167                 switch (saidx->dst.sa.sa_family) {
 168 #ifdef INET
 169                 case AF_INET:
 170                         IPSECSTAT_INC(ips_out_bundlesa);
 171                         return ipsec4_process_packet(m, isr->next, 0, 0);
 172                         /* NOTREACHED */
 173 #endif
 174 #ifdef notyet
 175 #ifdef INET6
 176                 case AF_INET6:
 177                         /* XXX */
 178                         IPSEC6STAT_INC(ips_out_bundlesa);
 179                         return ipsec6_process_packet(m, isr->next);
 180                         /* NOTREACHED */
 181 #endif /* INET6 */
 182 #endif
 183                 default:
 184                         DPRINTF(("%s: unknown protocol family %u\n", __func__,
 185                             saidx->dst.sa.sa_family));
 186                         error = ENXIO;
 187                         goto bad;
 188                 }
 189         }
 190         key_sa_recordxfer(sav, m);              /* record data transfer */
 191
 192         /*
 193          * We're done with IPsec processing, transmit the packet using the
 194          * appropriate network protocol (IP or IPv6). SPD lookup will be
 195          * performed again there.
 196          */
 197         switch (saidx->dst.sa.sa_family) {
 198 #ifdef INET
 199         case AF_INET:
 200 #ifdef IPSEC_NAT_T
 201                 /*
 202                  * If NAT-T is enabled, now that all IPsec processing is done
 203                  * insert UDP encapsulation header after IP header.
 204                  */
 205                 if (sav->natt_type) {
 206                         struct ip *ip = mtod(m, struct ip *);
 207                         const int hlen = (ip->ip_hl << 2);
 208                         int size, off;
 209                         struct mbuf *mi;
 210                         struct udphdr *udp;
 211
 212                         size = sizeof(struct udphdr);
 213                         if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) {
 214                                 /*
 215                                  * draft-ietf-ipsec-nat-t-ike-0[01].txt and
 216                                  * draft-ietf-ipsec-udp-encaps-(00/)01.txt,
 217                                  * ignoring possible AH mode
 218                                  * non-IKE marker + non-ESP marker
 219                                  * from draft-ietf-ipsec-udp-encaps-00.txt.
 220                                  */
 221                                 size += sizeof(u_int64_t);
 222                         }
 223                         mi = m_makespace(m, hlen, size, &off);
 224                         if (mi == NULL) {
 225                                 DPRINTF(("%s: m_makespace for udphdr failed\n",
 226                                     __func__));
 227                                 error = ENOBUFS;
 228                                 goto bad;
 229                         }
 230
 231                         udp = (struct udphdr *)(mtod(mi, caddr_t) + off);
 232                         if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE)
 233                                 udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT);
 234                         else
 235                                 udp->uh_sport =
 236                                         KEY_PORTFROMSADDR(&sav->sah->saidx.src);
 237                         udp->uh_dport = KEY_PORTFROMSADDR(&sav->sah->saidx.dst);
 238                         udp->uh_sum = 0;
 239                         udp->uh_ulen = htons(m->m_pkthdr.len - hlen);
 240                         ip->ip_len = htons(m->m_pkthdr.len);
 241                         ip->ip_p = IPPROTO_UDP;
 242
 243                         if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE)
 244                                 *(u_int64_t *)(udp + 1) = 0;
 245                 }
 246 #endif /* IPSEC_NAT_T */
 247
 248                 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL);
 249 #endif /* INET */
 250 #ifdef INET6
 251         case AF_INET6:
 252                 /*
 253                  * We don't need massage, IPv6 header fields are always in
 254                  * net endian.
 255                  */
 256                 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
 257 #endif /* INET6 */
 258         }
 259         panic("ipsec_process_done");
 260 bad:
 261         m_freem(m);
 262         return (error);
 263 }
 264
 265 static struct ipsecrequest *
 266 ipsec_nextisr(
 267         struct mbuf *m,
 268         struct ipsecrequest *isr,
 269         int af,
 270         struct secasindex *saidx,
 271         int *error
 272 )
 273 {
 274 #define IPSEC_OSTAT(name)       do {            \
 275         if (isr->saidx.proto == IPPROTO_ESP)    \
 276                 ESPSTAT_INC(esps_##name);       \
 277         else if (isr->saidx.proto == IPPROTO_AH)\
 278                 AHSTAT_INC(ahs_##name);         \
 279         else                                    \
 280                 IPCOMPSTAT_INC(ipcomps_##name); \
 281 } while (0)
 282         struct secasvar *sav;
 283
 284         IPSECREQUEST_LOCK_ASSERT(isr);
 285
 286         IPSEC_ASSERT(af == AF_INET || af == AF_INET6,
 287                 ("invalid address family %u", af));
 288 again:
 289         /*
 290          * Craft SA index to search for proper SA.  Note that
 291          * we only fillin unspecified SA peers for transport
 292          * mode; for tunnel mode they must already be filled in.
 293          */
 294         *saidx = isr->saidx;
 295         if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) {
 296                 /* Fillin unspecified SA peers only for transport mode */
 297                 if (af == AF_INET) {
 298                         struct sockaddr_in *sin;
 299                         struct ip *ip = mtod(m, struct ip *);
 300
 301                         if (saidx->src.sa.sa_len == 0) {
 302                                 sin = &saidx->src.sin;
 303                                 sin->sin_len = sizeof(*sin);
 304                                 sin->sin_family = AF_INET;
 305                                 sin->sin_port = IPSEC_PORT_ANY;
 306                                 sin->sin_addr = ip->ip_src;
 307                         }
 308                         if (saidx->dst.sa.sa_len == 0) {
 309                                 sin = &saidx->dst.sin;
 310                                 sin->sin_len = sizeof(*sin);
 311                                 sin->sin_family = AF_INET;
 312                                 sin->sin_port = IPSEC_PORT_ANY;
 313                                 sin->sin_addr = ip->ip_dst;
 314                         }
 315                 } else {
 316                         struct sockaddr_in6 *sin6;
 317                         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 318
 319                         if (saidx->src.sin6.sin6_len == 0) {
 320                                 sin6 = (struct sockaddr_in6 *)&saidx->src;
 321                                 sin6->sin6_len = sizeof(*sin6);
 322                                 sin6->sin6_family = AF_INET6;
 323                                 sin6->sin6_port = IPSEC_PORT_ANY;
 324                                 sin6->sin6_addr = ip6->ip6_src;
 325                                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
 326                                         /* fix scope id for comparing SPD */
 327                                         sin6->sin6_addr.s6_addr16[1] = 0;
 328                                         sin6->sin6_scope_id =
 329                                             ntohs(ip6->ip6_src.s6_addr16[1]);
 330                                 }
 331                         }
 332                         if (saidx->dst.sin6.sin6_len == 0) {
 333                                 sin6 = (struct sockaddr_in6 *)&saidx->dst;
 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_dst;
 338                                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
 339                                         /* fix scope id for comparing SPD */
 340                                         sin6->sin6_addr.s6_addr16[1] = 0;
 341                                         sin6->sin6_scope_id =
 342                                             ntohs(ip6->ip6_dst.s6_addr16[1]);
 343                                 }
 344                         }
 345                 }
 346         }
 347
 348         /*
 349          * Lookup SA and validate it.
 350          */
 351         *error = key_checkrequest(isr, saidx);
 352         if (*error != 0) {
 353                 /*
 354                  * IPsec processing is required, but no SA found.
 355                  * I assume that key_acquire() had been called
 356                  * to get/establish the SA. Here I discard
 357                  * this packet because it is responsibility for
 358                  * upper layer to retransmit the packet.
 359                  */
 360                 switch(af) {
 361                 case AF_INET:
 362                         IPSECSTAT_INC(ips_out_nosa);
 363                         break;
 364 #ifdef INET6
 365                 case AF_INET6:
 366                         IPSEC6STAT_INC(ips_out_nosa);
 367                         break;
 368 #endif
 369                 }
 370                 goto bad;
 371         }
 372         sav = isr->sav;
 373         if (sav == NULL) {
 374                 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE,
 375                         ("no SA found, but required; level %u",
 376                         ipsec_get_reqlevel(isr)));
 377                 IPSECREQUEST_UNLOCK(isr);
 378                 isr = isr->next;
 379                 /*
 380                  * If isr is NULL, we found a 'use' policy w/o SA.
 381                  * Return w/o error and w/o isr so we can drop out
 382                  * and continue w/o IPsec processing.
 383                  */
 384                 if (isr == NULL)
 385                         return isr;
 386                 IPSECREQUEST_LOCK(isr);
 387                 goto again;
 388         }
 389
 390         /*
 391          * Check system global policy controls.
 392          */
 393         if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) ||
 394             (isr->saidx.proto == IPPROTO_AH && !V_ah_enable) ||
 395             (isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) {
 396                 DPRINTF(("%s: IPsec outbound packet dropped due"
 397                         " to policy (check your sysctls)\n", __func__));
 398                 IPSEC_OSTAT(pdrops);
 399                 *error = EHOSTUNREACH;
 400                 goto bad;
 401         }
 402
 403         /*
 404          * Sanity check the SA contents for the caller
 405          * before they invoke the xform output method.
 406          */
 407         if (sav->tdb_xform == NULL) {
 408                 DPRINTF(("%s: no transform for SA\n", __func__));
 409                 IPSEC_OSTAT(noxform);
 410                 *error = EHOSTUNREACH;
 411                 goto bad;
 412         }
 413         return isr;
 414 bad:
 415         IPSEC_ASSERT(*error != 0, ("error return w/ no error code"));
 416         IPSECREQUEST_UNLOCK(isr);
 417         return NULL;
 418 #undef IPSEC_OSTAT
 419 }
 420
 421 #ifdef INET
 422 /*
 423  * IPsec output logic for IPv4.
 424  */
 425 int
 426 ipsec4_process_packet(
 427         struct mbuf *m,
 428         struct ipsecrequest *isr,
 429         int flags,
 430         int tunalready)
 431 {
 432         struct secasindex saidx;
 433         struct secasvar *sav;
 434         struct ip *ip;
 435         int error, i, off;
 436
 437         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 438         IPSEC_ASSERT(isr != NULL, ("null isr"));
 439
 440         IPSECREQUEST_LOCK(isr);         /* insure SA contents don't change */
 441
 442         isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error);
 443         if (isr == NULL) {
 444                 if (error != 0)
 445                         goto bad;
 446                 return EJUSTRETURN;
 447         }
 448
 449         sav = isr->sav;
 450
 451 #ifdef DEV_ENC
 452         encif->if_opackets++;
 453         encif->if_obytes += m->m_pkthdr.len;
 454
 455         /* pass the mbuf to enc0 for bpf processing */
 456         ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE);
 457         /* pass the mbuf to enc0 for packet filtering */
 458         if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
 459                 goto bad;
 460 #endif
 461
 462         if (!tunalready) {
 463                 union sockaddr_union *dst = &sav->sah->saidx.dst;
 464                 int setdf;
 465
 466                 /*
 467                  * Collect IP_DF state from the outer header.
 468                  */
 469                 if (dst->sa.sa_family == AF_INET) {
 470                         if (m->m_len < sizeof (struct ip) &&
 471                             (m = m_pullup(m, sizeof (struct ip))) == NULL) {
 472                                 error = ENOBUFS;
 473                                 goto bad;
 474                         }
 475                         ip = mtod(m, struct ip *);
 476                         /* Honor system-wide control of how to handle IP_DF */
 477                         switch (V_ip4_ipsec_dfbit) {
 478                         case 0:                 /* clear in outer header */
 479                         case 1:                 /* set in outer header */
 480                                 setdf = V_ip4_ipsec_dfbit;
 481                                 break;
 482                         default:                /* propagate to outer header */
 483                                 setdf = ntohs(ip->ip_off & IP_DF);
 484                                 break;
 485                         }
 486                 } else {
 487                         ip = NULL;              /* keep compiler happy */
 488                         setdf = 0;
 489                 }
 490                 /* Do the appropriate encapsulation, if necessary */
 491                 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
 492                     dst->sa.sa_family != AF_INET ||         /* PF mismatch */
 493 #if 0
 494                     (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */
 495                     sav->tdb_xform->xf_type == XF_IP4 ||    /* ditto */
 496 #endif
 497                     (dst->sa.sa_family == AF_INET &&        /* Proxy */
 498                      dst->sin.sin_addr.s_addr != INADDR_ANY &&
 499                      dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) {
 500                         struct mbuf *mp;
 501
 502                         /* Fix IPv4 header checksum and length */
 503                         if (m->m_len < sizeof (struct ip) &&
 504                             (m = m_pullup(m, sizeof (struct ip))) == NULL) {
 505                                 error = ENOBUFS;
 506                                 goto bad;
 507                         }
 508                         ip = mtod(m, struct ip *);
 509                         if (ip->ip_v == IPVERSION) {
 510                                 ip->ip_len = htons(m->m_pkthdr.len);
 511                                 ip->ip_sum = 0;
 512                                 ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
 513                         }
 514
 515                         /* Encapsulate the packet */
 516                         error = ipip_output(m, isr, &mp, 0, 0);
 517                         if (mp == NULL && !error) {
 518                                 /* Should never happen. */
 519                                 DPRINTF(("%s: ipip_output returns no mbuf and "
 520                                         "no error!", __func__));
 521                                 error = EFAULT;
 522                         }
 523                         if (error) {
 524                                 if (mp) {
 525                                         /* XXX: Should never happen! */
 526                                         m_freem(mp);
 527                                 }
 528                                 m = NULL; /* ipip_output() already freed it */
 529                                 goto bad;
 530                         }
 531                         m = mp, mp = NULL;
 532                         /*
 533                          * ipip_output clears IP_DF in the new header.  If
 534                          * we need to propagate IP_DF from the outer header,
 535                          * then we have to do it here.
 536                          *
 537                          * XXX shouldn't assume what ipip_output does.
 538                          */
 539                         if (dst->sa.sa_family == AF_INET && setdf) {
 540                                 if (m->m_len < sizeof (struct ip) &&
 541                                     (m = m_pullup(m, sizeof (struct ip))) == NULL) {
 542                                         error = ENOBUFS;
 543                                         goto bad;
 544                                 }
 545                                 ip = mtod(m, struct ip *);
 546                                 ip->ip_off = ntohs(ip->ip_off);
 547                                 ip->ip_off |= IP_DF;
 548                                 ip->ip_off = htons(ip->ip_off);
 549                         }
 550                 }
 551         }
 552
 553 #ifdef DEV_ENC
 554         /* pass the mbuf to enc0 for bpf processing */
 555         ipsec_bpf(m, sav, sav->sah->saidx.dst.sa.sa_family, ENC_OUT|ENC_AFTER);
 556         /* pass the mbuf to enc0 for packet filtering */
 557         if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
 558                 goto bad;
 559 #endif
 560
 561         /*
 562          * Dispatch to the appropriate IPsec transform logic.  The
 563          * packet will be returned for transmission after crypto
 564          * processing, etc. are completed.  For encapsulation we
 565          * bypass this call because of the explicit call done above
 566          * (necessary to deal with IP_DF handling for IPv4).
 567          *
 568          * NB: m & sav are ``passed to caller'' who's reponsible for
 569          *     for reclaiming their resources.
 570          */
 571         if (sav->tdb_xform->xf_type != XF_IP4) {
 572                 union sockaddr_union *dst = &sav->sah->saidx.dst;
 573                 switch(dst->sa.sa_family) {
 574                 case AF_INET:
 575                         ip = mtod(m, struct ip *);
 576                         i = ip->ip_hl << 2;
 577                         off = offsetof(struct ip, ip_p);
 578                         break;
 579 #ifdef INET6
 580                 case AF_INET6:
 581                         i = sizeof(struct ip6_hdr);
 582                         off = offsetof(struct ip6_hdr, ip6_nxt);
 583                         break;
 584 #endif /* INET6 */
 585                 default:
 586                 DPRINTF(("%s: unsupported protocol family %u\n",
 587                                  __func__, dst->sa.sa_family));
 588                         error = EPFNOSUPPORT;
 589                         IPSECSTAT_INC(ips_out_inval);
 590                         goto bad;
 591                 }
 592                 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
 593         } else {
 594                 error = ipsec_process_done(m, isr);
 595         }
 596         IPSECREQUEST_UNLOCK(isr);
 597         return error;
 598 bad:
 599         if (isr)
 600                 IPSECREQUEST_UNLOCK(isr);
 601         if (m)
 602                 m_freem(m);
 603         return error;
 604 }
 605 #endif
 606
 607
 608 #ifdef INET6
 609 static int
 610 in6_sa_equal_addrwithscope(const struct sockaddr_in6 *sa, const struct in6_addr *ia)
 611 {
 612         struct in6_addr ia2;
 613
 614         memcpy(&ia2, &sa->sin6_addr, sizeof(ia2));
 615         if (IN6_IS_SCOPE_LINKLOCAL(&sa->sin6_addr))
 616                 ia2.s6_addr16[1] = htons(sa->sin6_scope_id);
 617
 618         return IN6_ARE_ADDR_EQUAL(ia, &ia2);
 619 }
 620
 621 /*
 622  * IPsec output logic for IPv6.
 623  */
 624 int
 625 ipsec6_process_packet(
 626         struct mbuf *m,
 627         struct ipsecrequest *isr
 628     )
 629 {
 630         struct secasindex saidx;
 631         struct secasvar *sav;
 632         struct ip6_hdr *ip6;
 633         int error, i, off;
 634         union sockaddr_union *dst;
 635
 636         IPSEC_ASSERT(m != NULL, ("ipsec6_process_packet: null mbuf"));
 637         IPSEC_ASSERT(isr != NULL, ("ipsec6_process_packet: null isr"));
 638
 639         IPSECREQUEST_LOCK(isr);         /* insure SA contents don't change */
 640
 641         isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
 642         if (isr == NULL) {
 643                 if (error != 0)
 644                         goto bad;
 645                 return EJUSTRETURN;
 646         }
 647
 648         sav = isr->sav;
 649         dst = &sav->sah->saidx.dst;
 650
 651         ip6 = mtod(m, struct ip6_hdr *);
 652         ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6));
 653 #ifdef DEV_ENC
 654         encif->if_opackets++;
 655         encif->if_obytes += m->m_pkthdr.len;
 656
 657         /* pass the mbuf to enc0 for bpf processing */
 658         ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE);
 659         /* pass the mbuf to enc0 for packet filtering */
 660         if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
 661                 goto bad;
 662 #endif /* DEV_ENC */
 663
 664         /* Do the appropriate encapsulation, if necessary */
 665         if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
 666             dst->sa.sa_family != AF_INET6 ||        /* PF mismatch */
 667             ((dst->sa.sa_family == AF_INET6) &&
 668              (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) &&
 669              (!in6_sa_equal_addrwithscope(&dst->sin6,
 670                                   &ip6->ip6_dst)))) {
 671                 struct mbuf *mp;
 672
 673                 /* Fix IPv6 header payload length. */
 674                 if (m->m_len < sizeof(struct ip6_hdr))
 675                         if ((m = m_pullup(m,sizeof(struct ip6_hdr))) == NULL) {
 676                                 error = ENOBUFS;
 677                                 goto bad;
 678                         }
 679
 680                 if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) {
 681                         /* No jumbogram support. */
 682                         error = ENXIO;   /*XXX*/
 683                         goto bad;
 684                 }
 685
 686                 /* Encapsulate the packet */
 687                 error = ipip_output(m, isr, &mp, 0, 0);
 688                 if (mp == NULL && !error) {
 689                         /* Should never happen. */
 690                         DPRINTF(("ipsec6_process_packet: ipip_output "
 691                                  "returns no mbuf and no error!"));
 692                         error = EFAULT;
 693                         goto bad;
 694                 }
 695
 696                 if (error) {
 697                         if (mp) {
 698                                 /* XXX: Should never happen! */
 699                                 m_freem(mp);
 700                         }
 701                         m = NULL; /* ipip_output() already freed it */
 702                         goto bad;
 703                 }
 704
 705                 m = mp;
 706                 mp = NULL;
 707         }
 708
 709 #ifdef DEV_ENC
 710         ipsec_bpf(m, isr->sav, dst->sa.sa_family, ENC_OUT|ENC_AFTER);
 711         /* pass the mbuf to enc0 for packet filtering */
 712         if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
 713                 goto bad;
 714 #endif /* DEV_ENC */
 715
 716         switch(dst->sa.sa_family) {
 717 #ifdef INET
 718         case AF_INET:
 719                 {
 720                 struct ip *ip;
 721                 ip = mtod(m, struct ip *);
 722                 i = ip->ip_hl << 2;
 723                 off = offsetof(struct ip, ip_p);
 724                 }
 725                 break;
 726 #endif /* AF_INET */
 727         case AF_INET6:
 728                 i = sizeof(struct ip6_hdr);
 729                 off = offsetof(struct ip6_hdr, ip6_nxt);
 730                 break;
 731         default:
 732                 DPRINTF(("%s: unsupported protocol family %u\n",
 733                                  __func__, dst->sa.sa_family));
 734                 error = EPFNOSUPPORT;
 735                 IPSEC6STAT_INC(ips_out_inval);
 736                 goto bad;
 737         }
 738         error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
 739         IPSECREQUEST_UNLOCK(isr);
 740         return error;
 741 bad:
 742
 743         if (isr)
 744                 IPSECREQUEST_UNLOCK(isr);
 745         if (m)
 746                 m_freem(m);
 747         return error;
 748 }
 749 #endif /*INET6*/