The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netipsec/ipsec_output.c

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    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: releng/10.2/sys/netipsec/ipsec_output.c 283901 2015-06-02 03:14:42Z ae $
   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*/

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