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         key_sa_recordxfer(sav, m);              /* record data transfer */
 162
 163         /*
 164          * If there's another (bundled) SA to apply, do so.
 165          * Note that this puts a burden on the kernel stack size.
 166          * If this is a problem we'll need to introduce a queue
 167          * to set the packet on so we can unwind the stack before
 168          * doing further processing.
 169          *
 170          * If ipsec[46]_process_packet() will successfully queue
 171          * the request, we need to take additional reference to SP,
 172          * because xform callback will release reference.
 173          */
 174         if (isr->next) {
 175                 /* XXX-BZ currently only support same AF bundles. */
 176                 switch (saidx->dst.sa.sa_family) {
 177 #ifdef INET
 178                 case AF_INET:
 179                         IPSECSTAT_INC(ips_out_bundlesa);
 180                         key_addref(isr->sp);
 181                         error = ipsec4_process_packet(m, isr->next);
 182                         if (error != 0)
 183                                 KEY_FREESP(&isr->sp);
 184                         return (error);
 185                         /* NOTREACHED */
 186 #endif
 187 #ifdef notyet
 188 #ifdef INET6
 189                 case AF_INET6:
 190                         /* XXX */
 191                         IPSEC6STAT_INC(ips_out_bundlesa);
 192                         key_addref(isr->sp);
 193                         error = ipsec6_process_packet(m, isr->next);
 194                         if (error != 0)
 195                                 KEY_FREESP(&isr->sp);
 196                         return (error);
 197                         /* NOTREACHED */
 198 #endif /* INET6 */
 199 #endif
 200                 default:
 201                         DPRINTF(("%s: unknown protocol family %u\n", __func__,
 202                             saidx->dst.sa.sa_family));
 203                         error = ENXIO;
 204                         goto bad;
 205                 }
 206         }
 207
 208         /*
 209          * We're done with IPsec processing, transmit the packet using the
 210          * appropriate network protocol (IP or IPv6).
 211          */
 212         switch (saidx->dst.sa.sa_family) {
 213 #ifdef INET
 214         case AF_INET:
 215 #ifdef IPSEC_NAT_T
 216                 /*
 217                  * If NAT-T is enabled, now that all IPsec processing is done
 218                  * insert UDP encapsulation header after IP header.
 219                  */
 220                 if (sav->natt_type) {
 221                         struct ip *ip = mtod(m, struct ip *);
 222                         const int hlen = (ip->ip_hl << 2);
 223                         int size, off;
 224                         struct mbuf *mi;
 225                         struct udphdr *udp;
 226
 227                         size = sizeof(struct udphdr);
 228                         if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) {
 229                                 /*
 230                                  * draft-ietf-ipsec-nat-t-ike-0[01].txt and
 231                                  * draft-ietf-ipsec-udp-encaps-(00/)01.txt,
 232                                  * ignoring possible AH mode
 233                                  * non-IKE marker + non-ESP marker
 234                                  * from draft-ietf-ipsec-udp-encaps-00.txt.
 235                                  */
 236                                 size += sizeof(u_int64_t);
 237                         }
 238                         mi = m_makespace(m, hlen, size, &off);
 239                         if (mi == NULL) {
 240                                 DPRINTF(("%s: m_makespace for udphdr failed\n",
 241                                     __func__));
 242                                 error = ENOBUFS;
 243                                 goto bad;
 244                         }
 245
 246                         udp = (struct udphdr *)(mtod(mi, caddr_t) + off);
 247                         if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE)
 248                                 udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT);
 249                         else
 250                                 udp->uh_sport =
 251                                         KEY_PORTFROMSADDR(&sav->sah->saidx.src);
 252                         udp->uh_dport = KEY_PORTFROMSADDR(&sav->sah->saidx.dst);
 253                         udp->uh_sum = 0;
 254                         udp->uh_ulen = htons(m->m_pkthdr.len - hlen);
 255                         ip->ip_len = htons(m->m_pkthdr.len);
 256                         ip->ip_p = IPPROTO_UDP;
 257
 258                         if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE)
 259                                 *(u_int64_t *)(udp + 1) = 0;
 260                 }
 261 #endif /* IPSEC_NAT_T */
 262
 263                 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL);
 264 #endif /* INET */
 265 #ifdef INET6
 266         case AF_INET6:
 267                 /*
 268                  * We don't need massage, IPv6 header fields are always in
 269                  * net endian.
 270                  */
 271                 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
 272 #endif /* INET6 */
 273         }
 274         panic("ipsec_process_done");
 275 bad:
 276         m_freem(m);
 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(name)       do {            \
 290         if (isr->saidx.proto == IPPROTO_ESP)    \
 291                 ESPSTAT_INC(esps_##name);       \
 292         else if (isr->saidx.proto == IPPROTO_AH)\
 293                 AHSTAT_INC(ahs_##name);         \
 294         else                                    \
 295                 IPCOMPSTAT_INC(ipcomps_##name); \
 296 } while (0)
 297         struct secasvar *sav;
 298
 299         IPSECREQUEST_LOCK_ASSERT(isr);
 300
 301         IPSEC_ASSERT(af == AF_INET || af == AF_INET6,
 302                 ("invalid address family %u", af));
 303 again:
 304         /*
 305          * Craft SA index to search for proper SA.  Note that
 306          * we only fillin unspecified SA peers for transport
 307          * mode; for tunnel mode they must already be filled in.
 308          */
 309         *saidx = isr->saidx;
 310         if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) {
 311                 /* Fillin unspecified SA peers only for transport mode */
 312                 if (af == AF_INET) {
 313                         struct sockaddr_in *sin;
 314                         struct ip *ip = mtod(m, struct ip *);
 315
 316                         if (saidx->src.sa.sa_len == 0) {
 317                                 sin = &saidx->src.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_src;
 322                         }
 323                         if (saidx->dst.sa.sa_len == 0) {
 324                                 sin = &saidx->dst.sin;
 325                                 sin->sin_len = sizeof(*sin);
 326                                 sin->sin_family = AF_INET;
 327                                 sin->sin_port = IPSEC_PORT_ANY;
 328                                 sin->sin_addr = ip->ip_dst;
 329                         }
 330                 } else {
 331                         struct sockaddr_in6 *sin6;
 332                         struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
 333
 334                         if (saidx->src.sin6.sin6_len == 0) {
 335                                 sin6 = (struct sockaddr_in6 *)&saidx->src;
 336                                 sin6->sin6_len = sizeof(*sin6);
 337                                 sin6->sin6_family = AF_INET6;
 338                                 sin6->sin6_port = IPSEC_PORT_ANY;
 339                                 sin6->sin6_addr = ip6->ip6_src;
 340                                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
 341                                         /* fix scope id for comparing SPD */
 342                                         sin6->sin6_addr.s6_addr16[1] = 0;
 343                                         sin6->sin6_scope_id =
 344                                             ntohs(ip6->ip6_src.s6_addr16[1]);
 345                                 }
 346                         }
 347                         if (saidx->dst.sin6.sin6_len == 0) {
 348                                 sin6 = (struct sockaddr_in6 *)&saidx->dst;
 349                                 sin6->sin6_len = sizeof(*sin6);
 350                                 sin6->sin6_family = AF_INET6;
 351                                 sin6->sin6_port = IPSEC_PORT_ANY;
 352                                 sin6->sin6_addr = ip6->ip6_dst;
 353                                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
 354                                         /* fix scope id for comparing SPD */
 355                                         sin6->sin6_addr.s6_addr16[1] = 0;
 356                                         sin6->sin6_scope_id =
 357                                             ntohs(ip6->ip6_dst.s6_addr16[1]);
 358                                 }
 359                         }
 360                 }
 361         }
 362
 363         /*
 364          * Lookup SA and validate it.
 365          */
 366         *error = key_checkrequest(isr, saidx);
 367         if (*error != 0) {
 368                 /*
 369                  * IPsec processing is required, but no SA found.
 370                  * I assume that key_acquire() had been called
 371                  * to get/establish the SA. Here I discard
 372                  * this packet because it is responsibility for
 373                  * upper layer to retransmit the packet.
 374                  */
 375                 switch(af) {
 376                 case AF_INET:
 377                         IPSECSTAT_INC(ips_out_nosa);
 378                         break;
 379 #ifdef INET6
 380                 case AF_INET6:
 381                         IPSEC6STAT_INC(ips_out_nosa);
 382                         break;
 383 #endif
 384                 }
 385                 goto bad;
 386         }
 387         sav = isr->sav;
 388         if (sav == NULL) {
 389                 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE,
 390                         ("no SA found, but required; level %u",
 391                         ipsec_get_reqlevel(isr)));
 392                 IPSECREQUEST_UNLOCK(isr);
 393                 isr = isr->next;
 394                 /*
 395                  * If isr is NULL, we found a 'use' policy w/o SA.
 396                  * Return w/o error and w/o isr so we can drop out
 397                  * and continue w/o IPsec processing.
 398                  */
 399                 if (isr == NULL)
 400                         return isr;
 401                 IPSECREQUEST_LOCK(isr);
 402                 goto again;
 403         }
 404
 405         /*
 406          * Check system global policy controls.
 407          */
 408         if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) ||
 409             (isr->saidx.proto == IPPROTO_AH && !V_ah_enable) ||
 410             (isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) {
 411                 DPRINTF(("%s: IPsec outbound packet dropped due"
 412                         " to policy (check your sysctls)\n", __func__));
 413                 IPSEC_OSTAT(pdrops);
 414                 *error = EHOSTUNREACH;
 415                 goto bad;
 416         }
 417
 418         /*
 419          * Sanity check the SA contents for the caller
 420          * before they invoke the xform output method.
 421          */
 422         if (sav->tdb_xform == NULL) {
 423                 DPRINTF(("%s: no transform for SA\n", __func__));
 424                 IPSEC_OSTAT(noxform);
 425                 *error = EHOSTUNREACH;
 426                 goto bad;
 427         }
 428         return isr;
 429 bad:
 430         IPSEC_ASSERT(*error != 0, ("error return w/ no error code"));
 431         IPSECREQUEST_UNLOCK(isr);
 432         return NULL;
 433 #undef IPSEC_OSTAT
 434 }
 435
 436 static int
 437 ipsec_encap(struct mbuf **mp, struct secasindex *saidx)
 438 {
 439 #ifdef INET6
 440         struct ip6_hdr *ip6;
 441 #endif
 442         struct ip *ip;
 443         int setdf;
 444         uint8_t itos, proto;
 445
 446         ip = mtod(*mp, struct ip *);
 447         switch (ip->ip_v) {
 448 #ifdef INET
 449         case IPVERSION:
 450                 proto = IPPROTO_IPIP;
 451                 /*
 452                  * Collect IP_DF state from the inner header
 453                  * and honor system-wide control of how to handle it.
 454                  */
 455                 switch (V_ip4_ipsec_dfbit) {
 456                 case 0: /* clear in outer header */
 457                 case 1: /* set in outer header */
 458                         setdf = V_ip4_ipsec_dfbit;
 459                         break;
 460                 default:/* propagate to outer header */
 461                         setdf = (ip->ip_off & ntohs(IP_DF)) != 0;
 462                 }
 463                 itos = ip->ip_tos;
 464                 break;
 465 #endif
 466 #ifdef INET6
 467         case (IPV6_VERSION >> 4):
 468                 proto = IPPROTO_IPV6;
 469                 ip6 = mtod(*mp, struct ip6_hdr *);
 470                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
 471                 setdf = V_ip4_ipsec_dfbit ? 1: 0;
 472                 /* scoped address handling */
 473                 in6_clearscope(&ip6->ip6_src);
 474                 in6_clearscope(&ip6->ip6_dst);
 475                 break;
 476 #endif
 477         default:
 478                 return (EAFNOSUPPORT);
 479         }
 480         switch (saidx->dst.sa.sa_family) {
 481 #ifdef INET
 482         case AF_INET:
 483                 if (saidx->src.sa.sa_family != AF_INET ||
 484                     saidx->src.sin.sin_addr.s_addr == INADDR_ANY ||
 485                     saidx->dst.sin.sin_addr.s_addr == INADDR_ANY)
 486                         return (EINVAL);
 487                 M_PREPEND(*mp, sizeof(struct ip), M_NOWAIT);
 488                 if (*mp == NULL)
 489                         return (ENOBUFS);
 490                 ip = mtod(*mp, struct ip *);
 491                 ip->ip_v = IPVERSION;
 492                 ip->ip_hl = sizeof(struct ip) >> 2;
 493                 ip->ip_p = proto;
 494                 ip->ip_len = htons((*mp)->m_pkthdr.len);
 495                 ip->ip_ttl = V_ip_defttl;
 496                 ip->ip_sum = 0;
 497                 ip->ip_off = setdf ? htons(IP_DF): 0;
 498                 ip->ip_src = saidx->src.sin.sin_addr;
 499                 ip->ip_dst = saidx->dst.sin.sin_addr;
 500                 ip_ecn_ingress(V_ip4_ipsec_ecn, &ip->ip_tos, &itos);
 501                 ip_fillid(ip);
 502                 break;
 503 #endif /* INET */
 504 #ifdef INET6
 505         case AF_INET6:
 506                 if (saidx->src.sa.sa_family != AF_INET6 ||
 507                     IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr) ||
 508                     IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr))
 509                         return (EINVAL);
 510                 M_PREPEND(*mp, sizeof(struct ip6_hdr), M_NOWAIT);
 511                 if (*mp == NULL)
 512                         return (ENOBUFS);
 513                 ip6 = mtod(*mp, struct ip6_hdr *);
 514                 ip6->ip6_flow = 0;
 515                 ip6->ip6_vfc = IPV6_VERSION;
 516                 ip6->ip6_hlim = V_ip6_defhlim;
 517                 ip6->ip6_nxt = proto;
 518                 ip6->ip6_dst = saidx->dst.sin6.sin6_addr;
 519                 /* For link-local address embed scope zone id */
 520                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
 521                         ip6->ip6_dst.s6_addr16[1] =
 522                             htons(saidx->dst.sin6.sin6_scope_id & 0xffff);
 523                 ip6->ip6_src = saidx->src.sin6.sin6_addr;
 524                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
 525                         ip6->ip6_src.s6_addr16[1] =
 526                             htons(saidx->src.sin6.sin6_scope_id & 0xffff);
 527                 ip6->ip6_plen = htons((*mp)->m_pkthdr.len - sizeof(*ip6));
 528                 ip_ecn_ingress(V_ip6_ipsec_ecn, &proto, &itos);
 529                 ip6->ip6_flow |= htonl((uint32_t)proto << 20);
 530                 break;
 531 #endif /* INET6 */
 532         default:
 533                 return (EAFNOSUPPORT);
 534         }
 535         return (0);
 536 }
 537
 538 #ifdef INET
 539 /*
 540  * IPsec output logic for IPv4.
 541  */
 542 int
 543 ipsec4_process_packet(struct mbuf *m, struct ipsecrequest *isr)
 544 {
 545         char sbuf[INET6_ADDRSTRLEN], dbuf[INET6_ADDRSTRLEN];
 546         union sockaddr_union *dst;
 547         struct secasindex saidx;
 548         struct secasvar *sav;
 549         struct ip *ip;
 550         int error, i, off;
 551
 552         IPSEC_ASSERT(m != NULL, ("null mbuf"));
 553         IPSEC_ASSERT(isr != NULL, ("null isr"));
 554
 555         IPSECREQUEST_LOCK(isr);         /* insure SA contents don't change */
 556
 557         isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error);
 558         if (isr == NULL) {
 559                 if (error != 0)
 560                         goto bad;
 561                 return EJUSTRETURN;
 562         }
 563
 564         sav = isr->sav;
 565         if (m->m_len < sizeof(struct ip) &&
 566             (m = m_pullup(m, sizeof (struct ip))) == NULL) {
 567                 error = ENOBUFS;
 568                 goto bad;
 569         }
 570         ip = mtod(m, struct ip *);
 571         dst = &sav->sah->saidx.dst;
 572 #ifdef DEV_ENC
 573         if_inc_counter(encif, IFCOUNTER_OPACKETS, 1);
 574         if_inc_counter(encif, IFCOUNTER_OBYTES, m->m_pkthdr.len);
 575
 576         /* pass the mbuf to enc0 for bpf processing */
 577         ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE);
 578         /* pass the mbuf to enc0 for packet filtering */
 579         if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
 580                 goto bad;
 581         ip = mtod(m, struct ip *);
 582 #endif
 583         /* Do the appropriate encapsulation, if necessary */
 584         if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
 585             dst->sa.sa_family != AF_INET ||         /* PF mismatch */
 586             (dst->sa.sa_family == AF_INET &&        /* Proxy */
 587              dst->sin.sin_addr.s_addr != INADDR_ANY &&
 588              dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) {
 589                 /* Fix IPv4 header checksum and length */
 590                 ip->ip_len = htons(m->m_pkthdr.len);
 591                 ip->ip_sum = 0;
 592                 ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
 593                 error = ipsec_encap(&m, &sav->sah->saidx);
 594                 if (error != 0) {
 595                         DPRINTF(("%s: encapsulation for SA %s->%s "
 596                             "SPI 0x%08x failed with error %d\n", __func__,
 597                             ipsec_address(&sav->sah->saidx.src, sbuf,
 598                                 sizeof(sbuf)),
 599                             ipsec_address(&sav->sah->saidx.dst, dbuf,
 600                                 sizeof(dbuf)), ntohl(sav->spi), error));
 601                         goto bad;
 602                 }
 603         }
 604 #ifdef DEV_ENC
 605         /* pass the mbuf to enc0 for bpf processing */
 606         ipsec_bpf(m, sav, sav->sah->saidx.dst.sa.sa_family, ENC_OUT|ENC_AFTER);
 607         /* pass the mbuf to enc0 for packet filtering */
 608         if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
 609                 goto bad;
 610 #endif
 611
 612         /*
 613          * Dispatch to the appropriate IPsec transform logic.  The
 614          * packet will be returned for transmission after crypto
 615          * processing, etc. are completed.
 616          *
 617          * NB: m & sav are ``passed to caller'' who's reponsible for
 618          *     for reclaiming their resources.
 619          */
 620         switch(dst->sa.sa_family) {
 621         case AF_INET:
 622                 ip = mtod(m, struct ip *);
 623                 i = ip->ip_hl << 2;
 624                 off = offsetof(struct ip, ip_p);
 625                 break;
 626 #ifdef INET6
 627         case AF_INET6:
 628                 i = sizeof(struct ip6_hdr);
 629                 off = offsetof(struct ip6_hdr, ip6_nxt);
 630                 break;
 631 #endif /* INET6 */
 632         default:
 633                 DPRINTF(("%s: unsupported protocol family %u\n",
 634                     __func__, dst->sa.sa_family));
 635                 error = EPFNOSUPPORT;
 636                 IPSECSTAT_INC(ips_out_inval);
 637                 goto bad;
 638         }
 639         error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
 640         IPSECREQUEST_UNLOCK(isr);
 641         return (error);
 642 bad:
 643         if (isr)
 644                 IPSECREQUEST_UNLOCK(isr);
 645         if (m)
 646                 m_freem(m);
 647         return error;
 648 }
 649 #endif
 650
 651
 652 #ifdef INET6
 653 static int
 654 in6_sa_equal_addrwithscope(const struct sockaddr_in6 *sa, const struct in6_addr *ia)
 655 {
 656         struct in6_addr ia2;
 657
 658         memcpy(&ia2, &sa->sin6_addr, sizeof(ia2));
 659         if (IN6_IS_SCOPE_LINKLOCAL(&sa->sin6_addr))
 660                 ia2.s6_addr16[1] = htons(sa->sin6_scope_id);
 661
 662         return IN6_ARE_ADDR_EQUAL(ia, &ia2);
 663 }
 664
 665 /*
 666  * IPsec output logic for IPv6.
 667  */
 668 int
 669 ipsec6_process_packet(struct mbuf *m, struct ipsecrequest *isr)
 670 {
 671         char sbuf[INET6_ADDRSTRLEN], dbuf[INET6_ADDRSTRLEN];
 672         struct secasindex saidx;
 673         struct secasvar *sav;
 674         struct ip6_hdr *ip6;
 675         int error, i, off;
 676         union sockaddr_union *dst;
 677
 678         IPSEC_ASSERT(m != NULL, ("ipsec6_process_packet: null mbuf"));
 679         IPSEC_ASSERT(isr != NULL, ("ipsec6_process_packet: null isr"));
 680
 681         IPSECREQUEST_LOCK(isr);         /* insure SA contents don't change */
 682
 683         isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error);
 684         if (isr == NULL) {
 685                 if (error != 0)
 686                         goto bad;
 687                 return EJUSTRETURN;
 688         }
 689         sav = isr->sav;
 690         dst = &sav->sah->saidx.dst;
 691
 692         ip6 = mtod(m, struct ip6_hdr *);
 693         ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6));
 694 #ifdef DEV_ENC
 695         if_inc_counter(encif, IFCOUNTER_OPACKETS, 1);
 696         if_inc_counter(encif, IFCOUNTER_OBYTES, m->m_pkthdr.len);
 697
 698         /* pass the mbuf to enc0 for bpf processing */
 699         ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE);
 700         /* pass the mbuf to enc0 for packet filtering */
 701         if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0)
 702                 goto bad;
 703         ip6 = mtod(m, struct ip6_hdr *);
 704 #endif /* DEV_ENC */
 705
 706         /* Do the appropriate encapsulation, if necessary */
 707         if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
 708             dst->sa.sa_family != AF_INET6 ||        /* PF mismatch */
 709             ((dst->sa.sa_family == AF_INET6) &&
 710              (!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) &&
 711              (!in6_sa_equal_addrwithscope(&dst->sin6,
 712                                   &ip6->ip6_dst)))) {
 713                 if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) {
 714                         /* No jumbogram support. */
 715                         error = ENXIO;   /*XXX*/
 716                         goto bad;
 717                 }
 718                 error = ipsec_encap(&m, &sav->sah->saidx);
 719                 if (error != 0) {
 720                         DPRINTF(("%s: encapsulation for SA %s->%s "
 721                             "SPI 0x%08x failed with error %d\n", __func__,
 722                             ipsec_address(&sav->sah->saidx.src, sbuf,
 723                                 sizeof(sbuf)),
 724                             ipsec_address(&sav->sah->saidx.dst, dbuf,
 725                                 sizeof(dbuf)), ntohl(sav->spi), error));
 726                         goto bad;
 727                 }
 728         }
 729
 730 #ifdef DEV_ENC
 731         ipsec_bpf(m, isr->sav, dst->sa.sa_family, ENC_OUT|ENC_AFTER);
 732         /* pass the mbuf to enc0 for packet filtering */
 733         if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0)
 734                 goto bad;
 735 #endif /* DEV_ENC */
 736
 737         switch(dst->sa.sa_family) {
 738 #ifdef INET
 739         case AF_INET:
 740                 {
 741                 struct ip *ip;
 742                 ip = mtod(m, struct ip *);
 743                 i = ip->ip_hl << 2;
 744                 off = offsetof(struct ip, ip_p);
 745                 }
 746                 break;
 747 #endif /* AF_INET */
 748         case AF_INET6:
 749                 i = sizeof(struct ip6_hdr);
 750                 off = offsetof(struct ip6_hdr, ip6_nxt);
 751                 break;
 752         default:
 753                 DPRINTF(("%s: unsupported protocol family %u\n",
 754                                  __func__, dst->sa.sa_family));
 755                 error = EPFNOSUPPORT;
 756                 IPSEC6STAT_INC(ips_out_inval);
 757                 goto bad;
 758         }
 759         error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off);
 760         IPSECREQUEST_UNLOCK(isr);
 761         return error;
 762 bad:
 763
 764         if (isr)
 765                 IPSECREQUEST_UNLOCK(isr);
 766         if (m)
 767                 m_freem(m);
 768         return error;
 769 }
 770 #endif /*INET6*/