The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netipsec/xform_ipip.c

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    1 /*      $FreeBSD: releng/6.0/sys/netipsec/xform_ipip.c 139823 2005-01-07 01:45:51Z imp $        */
    2 /*      $OpenBSD: ip_ipip.c,v 1.25 2002/06/10 18:04:55 itojun Exp $ */
    3 /*-
    4  * The authors of this code are John Ioannidis (ji@tla.org),
    5  * Angelos D. Keromytis (kermit@csd.uch.gr) and
    6  * Niels Provos (provos@physnet.uni-hamburg.de).
    7  *
    8  * The original version of this code was written by John Ioannidis
    9  * for BSD/OS in Athens, Greece, in November 1995.
   10  *
   11  * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
   12  * by Angelos D. Keromytis.
   13  *
   14  * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
   15  * and Niels Provos.
   16  *
   17  * Additional features in 1999 by Angelos D. Keromytis.
   18  *
   19  * Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
   20  * Angelos D. Keromytis and Niels Provos.
   21  * Copyright (c) 2001, Angelos D. Keromytis.
   22  *
   23  * Permission to use, copy, and modify this software with or without fee
   24  * is hereby granted, provided that this entire notice is included in
   25  * all copies of any software which is or includes a copy or
   26  * modification of this software.
   27  * You may use this code under the GNU public license if you so wish. Please
   28  * contribute changes back to the authors under this freer than GPL license
   29  * so that we may further the use of strong encryption without limitations to
   30  * all.
   31  *
   32  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
   33  * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
   34  * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
   35  * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
   36  * PURPOSE.
   37  */
   38 
   39 /*
   40  * IP-inside-IP processing
   41  */
   42 #include "opt_inet.h"
   43 #include "opt_inet6.h"
   44 
   45 #include <sys/param.h>
   46 #include <sys/systm.h>
   47 #include <sys/mbuf.h>
   48 #include <sys/socket.h>
   49 #include <sys/kernel.h>
   50 #include <sys/protosw.h>
   51 #include <sys/sysctl.h>
   52 
   53 #include <net/if.h>
   54 #include <net/route.h>
   55 #include <net/netisr.h>
   56 
   57 #include <netinet/in.h>
   58 #include <netinet/in_systm.h>
   59 #include <netinet/in_var.h>
   60 #include <netinet/ip.h>
   61 #include <netinet/ip_ecn.h>
   62 #include <netinet/ip_var.h>
   63 #include <netinet/ip_encap.h>
   64 #include <netinet/ipprotosw.h>
   65 
   66 #include <netipsec/ipsec.h>
   67 #include <netipsec/xform.h>
   68 
   69 #include <netipsec/ipip_var.h>
   70 
   71 #ifdef MROUTING
   72 #include <netinet/ip_mroute.h>
   73 #endif
   74 
   75 #ifdef INET6
   76 #include <netinet/ip6.h>
   77 #include <netipsec/ipsec6.h>
   78 #include <netinet6/ip6_ecn.h>
   79 #include <netinet6/in6_var.h>
   80 #include <netinet6/ip6protosw.h>
   81 #endif
   82 
   83 #include <netipsec/key.h>
   84 #include <netipsec/key_debug.h>
   85 
   86 #include <machine/stdarg.h>
   87 
   88 /*
   89  * We can control the acceptance of IP4 packets by altering the sysctl
   90  * net.inet.ipip.allow value.  Zero means drop them, all else is acceptance.
   91  */
   92 int     ipip_allow = 0;
   93 struct  ipipstat ipipstat;
   94 
   95 SYSCTL_DECL(_net_inet_ipip);
   96 SYSCTL_INT(_net_inet_ipip, OID_AUTO,
   97         ipip_allow,     CTLFLAG_RW,     &ipip_allow,    0, "");
   98 SYSCTL_STRUCT(_net_inet_ipip, IPSECCTL_STATS,
   99         stats,          CTLFLAG_RD,     &ipipstat,      ipipstat, "");
  100 
  101 /* XXX IPCOMP */
  102 #define M_IPSEC (M_AUTHIPHDR|M_AUTHIPDGM|M_DECRYPTED)
  103 
  104 static void _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp);
  105 
  106 #ifdef INET6
  107 /*
  108  * Really only a wrapper for ipip_input(), for use with IPv6.
  109  */
  110 int
  111 ip4_input6(struct mbuf **m, int *offp, int proto)
  112 {
  113 #if 0
  114         /* If we do not accept IP-in-IP explicitly, drop.  */
  115         if (!ipip_allow && ((*m)->m_flags & M_IPSEC) == 0) {
  116                 DPRINTF(("%s: dropped due to policy\n", __func__));
  117                 ipipstat.ipips_pdrops++;
  118                 m_freem(*m);
  119                 return IPPROTO_DONE;
  120         }
  121 #endif
  122         _ipip_input(*m, *offp, NULL);
  123         return IPPROTO_DONE;
  124 }
  125 #endif /* INET6 */
  126 
  127 #ifdef INET
  128 /*
  129  * Really only a wrapper for ipip_input(), for use with IPv4.
  130  */
  131 void
  132 ip4_input(struct mbuf *m, ...)
  133 {
  134         va_list ap;
  135         int iphlen;
  136 
  137 #if 0
  138         /* If we do not accept IP-in-IP explicitly, drop.  */
  139         if (!ipip_allow && (m->m_flags & M_IPSEC) == 0) {
  140                 DPRINTF(("%s: dropped due to policy\n", __func__));
  141                 ipipstat.ipips_pdrops++;
  142                 m_freem(m);
  143                 return;
  144         }
  145 #endif
  146         va_start(ap, m);
  147         iphlen = va_arg(ap, int);
  148         va_end(ap);
  149 
  150         _ipip_input(m, iphlen, NULL);
  151 }
  152 #endif /* INET */
  153 
  154 /*
  155  * ipip_input gets called when we receive an IP{46} encapsulated packet,
  156  * either because we got it at a real interface, or because AH or ESP
  157  * were being used in tunnel mode (in which case the rcvif element will
  158  * contain the address of the encX interface associated with the tunnel.
  159  */
  160 
  161 static void
  162 _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp)
  163 {
  164         register struct sockaddr_in *sin;
  165         register struct ifnet *ifp;
  166         register struct ifaddr *ifa;
  167         struct ip *ipo;
  168 #ifdef INET6
  169         register struct sockaddr_in6 *sin6;
  170         struct ip6_hdr *ip6 = NULL;
  171         u_int8_t itos;
  172 #endif
  173         u_int8_t nxt;
  174         int isr;
  175         u_int8_t otos;
  176         u_int8_t v;
  177         int hlen;
  178 
  179         ipipstat.ipips_ipackets++;
  180 
  181         m_copydata(m, 0, 1, &v);
  182 
  183         switch (v >> 4) {
  184 #ifdef INET
  185         case 4:
  186                 hlen = sizeof(struct ip);
  187                 break;
  188 #endif /* INET */
  189 #ifdef INET6
  190         case 6:
  191                 hlen = sizeof(struct ip6_hdr);
  192                 break;
  193 #endif
  194         default:
  195                 ipipstat.ipips_family++;
  196                 m_freem(m);
  197                 return /* EAFNOSUPPORT */;
  198         }
  199 
  200         /* Bring the IP header in the first mbuf, if not there already */
  201         if (m->m_len < hlen) {
  202                 if ((m = m_pullup(m, hlen)) == NULL) {
  203                         DPRINTF(("%s: m_pullup (1) failed\n", __func__));
  204                         ipipstat.ipips_hdrops++;
  205                         return;
  206                 }
  207         }
  208 
  209         ipo = mtod(m, struct ip *);
  210 
  211 #ifdef MROUTING
  212         if (ipo->ip_v == IPVERSION && ipo->ip_p == IPPROTO_IPV4) {
  213                 if (IN_MULTICAST(((struct ip *)((char *) ipo + iphlen))->ip_dst.s_addr)) {
  214                         ipip_mroute_input (m, iphlen);
  215                         return;
  216                 }
  217         }
  218 #endif /* MROUTING */
  219 
  220         /* Keep outer ecn field. */
  221         switch (v >> 4) {
  222 #ifdef INET
  223         case 4:
  224                 otos = ipo->ip_tos;
  225                 break;
  226 #endif /* INET */
  227 #ifdef INET6
  228         case 6:
  229                 otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff;
  230                 break;
  231 #endif
  232         default:
  233                 panic("ipip_input: unknown ip version %u (outer)", v>>4);
  234         }
  235 
  236         /* Remove outer IP header */
  237         m_adj(m, iphlen);
  238 
  239         /* Sanity check */
  240         if (m->m_pkthdr.len < sizeof(struct ip))  {
  241                 ipipstat.ipips_hdrops++;
  242                 m_freem(m);
  243                 return;
  244         }
  245 
  246         m_copydata(m, 0, 1, &v);
  247 
  248         switch (v >> 4) {
  249 #ifdef INET
  250         case 4:
  251                 hlen = sizeof(struct ip);
  252                 break;
  253 #endif /* INET */
  254 
  255 #ifdef INET6
  256         case 6:
  257                 hlen = sizeof(struct ip6_hdr);
  258                 break;
  259 #endif
  260         default:
  261                 ipipstat.ipips_family++;
  262                 m_freem(m);
  263                 return; /* EAFNOSUPPORT */
  264         }
  265 
  266         /*
  267          * Bring the inner IP header in the first mbuf, if not there already.
  268          */
  269         if (m->m_len < hlen) {
  270                 if ((m = m_pullup(m, hlen)) == NULL) {
  271                         DPRINTF(("%s: m_pullup (2) failed\n", __func__));
  272                         ipipstat.ipips_hdrops++;
  273                         return;
  274                 }
  275         }
  276 
  277         /*
  278          * RFC 1853 specifies that the inner TTL should not be touched on
  279          * decapsulation. There's no reason this comment should be here, but
  280          * this is as good as any a position.
  281          */
  282 
  283         /* Some sanity checks in the inner IP header */
  284         switch (v >> 4) {
  285 #ifdef INET
  286         case 4:
  287                 ipo = mtod(m, struct ip *);
  288                 nxt = ipo->ip_p;
  289                 ip_ecn_egress(ip4_ipsec_ecn, &otos, &ipo->ip_tos);
  290                 break;
  291 #endif /* INET */
  292 #ifdef INET6
  293         case 6:
  294                 ip6 = (struct ip6_hdr *) ipo;
  295                 nxt = ip6->ip6_nxt;
  296                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  297                 ip_ecn_egress(ip6_ipsec_ecn, &otos, &itos);
  298                 ip6->ip6_flow &= ~htonl(0xff << 20);
  299                 ip6->ip6_flow |= htonl((u_int32_t) itos << 20);
  300                 break;
  301 #endif
  302         default:
  303                 panic("ipip_input: unknown ip version %u (inner)", v>>4);
  304         }
  305 
  306         /* Check for local address spoofing. */
  307         if ((m->m_pkthdr.rcvif == NULL ||
  308             !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) &&
  309             ipip_allow != 2) {
  310                 IFNET_RLOCK();
  311                 TAILQ_FOREACH(ifp, &ifnet, if_link) {
  312                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  313 #ifdef INET
  314                                 if (ipo) {
  315                                         if (ifa->ifa_addr->sa_family !=
  316                                             AF_INET)
  317                                                 continue;
  318 
  319                                         sin = (struct sockaddr_in *) ifa->ifa_addr;
  320 
  321                                         if (sin->sin_addr.s_addr ==
  322                                             ipo->ip_src.s_addr) {
  323                                                 ipipstat.ipips_spoof++;
  324                                                 m_freem(m);
  325                                                 IFNET_RUNLOCK();
  326                                                 return;
  327                                         }
  328                                 }
  329 #endif /* INET */
  330 
  331 #ifdef INET6
  332                                 if (ip6) {
  333                                         if (ifa->ifa_addr->sa_family !=
  334                                             AF_INET6)
  335                                                 continue;
  336 
  337                                         sin6 = (struct sockaddr_in6 *) ifa->ifa_addr;
  338 
  339                                         if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_src)) {
  340                                                 ipipstat.ipips_spoof++;
  341                                                 m_freem(m);
  342                                                 IFNET_RUNLOCK();
  343                                                 return;
  344                                         }
  345 
  346                                 }
  347 #endif /* INET6 */
  348                         }
  349                 }
  350                 IFNET_RUNLOCK();
  351         }
  352 
  353         /* Statistics */
  354         ipipstat.ipips_ibytes += m->m_pkthdr.len - iphlen;
  355 
  356         /*
  357          * Interface pointer stays the same; if no IPsec processing has
  358          * been done (or will be done), this will point to a normal
  359          * interface. Otherwise, it'll point to an enc interface, which
  360          * will allow a packet filter to distinguish between secure and
  361          * untrusted packets.
  362          */
  363 
  364         switch (v >> 4) {
  365 #ifdef INET
  366         case 4:
  367                 isr = NETISR_IP;
  368                 break;
  369 #endif
  370 #ifdef INET6
  371         case 6:
  372                 isr = NETISR_IPV6;
  373                 break;
  374 #endif
  375         default:
  376                 panic("%s: bogus ip version %u", __func__, v>>4);
  377         }
  378 
  379         if (netisr_queue(isr, m)) {     /* (0) on success. */
  380                 ipipstat.ipips_qfull++;
  381                 DPRINTF(("%s: packet dropped because of full queue\n",
  382                         __func__));
  383         }
  384 }
  385 
  386 int
  387 ipip_output(
  388         struct mbuf *m,
  389         struct ipsecrequest *isr,
  390         struct mbuf **mp,
  391         int skip,
  392         int protoff
  393 )
  394 {
  395         struct secasvar *sav;
  396         u_int8_t tp, otos;
  397         struct secasindex *saidx;
  398         int error;
  399 #ifdef INET
  400         u_int8_t itos;
  401         struct ip *ipo;
  402 #endif /* INET */
  403 #ifdef INET6
  404         struct ip6_hdr *ip6, *ip6o;
  405 #endif /* INET6 */
  406 
  407         IPSEC_SPLASSERT_SOFTNET(__func__);
  408 
  409         sav = isr->sav;
  410         IPSEC_ASSERT(sav != NULL, ("null SA"));
  411         IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
  412 
  413         /* XXX Deal with empty TDB source/destination addresses. */
  414 
  415         m_copydata(m, 0, 1, &tp);
  416         tp = (tp >> 4) & 0xff;  /* Get the IP version number. */
  417 
  418         saidx = &sav->sah->saidx;
  419         switch (saidx->dst.sa.sa_family) {
  420 #ifdef INET
  421         case AF_INET:
  422                 if (saidx->src.sa.sa_family != AF_INET ||
  423                     saidx->src.sin.sin_addr.s_addr == INADDR_ANY ||
  424                     saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) {
  425                         DPRINTF(("%s: unspecified tunnel endpoint "
  426                             "address in SA %s/%08lx\n", __func__,
  427                             ipsec_address(&saidx->dst),
  428                             (u_long) ntohl(sav->spi)));
  429                         ipipstat.ipips_unspec++;
  430                         error = EINVAL;
  431                         goto bad;
  432                 }
  433 
  434                 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
  435                 if (m == 0) {
  436                         DPRINTF(("%s: M_PREPEND failed\n", __func__));
  437                         ipipstat.ipips_hdrops++;
  438                         error = ENOBUFS;
  439                         goto bad;
  440                 }
  441 
  442                 ipo = mtod(m, struct ip *);
  443 
  444                 ipo->ip_v = IPVERSION;
  445                 ipo->ip_hl = 5;
  446                 ipo->ip_len = htons(m->m_pkthdr.len);
  447                 ipo->ip_ttl = ip_defttl;
  448                 ipo->ip_sum = 0;
  449                 ipo->ip_src = saidx->src.sin.sin_addr;
  450                 ipo->ip_dst = saidx->dst.sin.sin_addr;
  451 
  452                 ipo->ip_id = ip_newid();
  453 
  454                 /* If the inner protocol is IP... */
  455                 if (tp == IPVERSION) {
  456                         /* Save ECN notification */
  457                         m_copydata(m, sizeof(struct ip) +
  458                             offsetof(struct ip, ip_tos),
  459                             sizeof(u_int8_t), (caddr_t) &itos);
  460 
  461                         ipo->ip_p = IPPROTO_IPIP;
  462 
  463                         /*
  464                          * We should be keeping tunnel soft-state and
  465                          * send back ICMPs if needed.
  466                          */
  467                         m_copydata(m, sizeof(struct ip) +
  468                             offsetof(struct ip, ip_off),
  469                             sizeof(u_int16_t), (caddr_t) &ipo->ip_off);
  470                         ipo->ip_off = ntohs(ipo->ip_off);
  471                         ipo->ip_off &= ~(IP_DF | IP_MF | IP_OFFMASK);
  472                         ipo->ip_off = htons(ipo->ip_off);
  473                 }
  474 #ifdef INET6
  475                 else if (tp == (IPV6_VERSION >> 4)) {
  476                         u_int32_t itos32;
  477 
  478                         /* Save ECN notification. */
  479                         m_copydata(m, sizeof(struct ip) +
  480                             offsetof(struct ip6_hdr, ip6_flow),
  481                             sizeof(u_int32_t), (caddr_t) &itos32);
  482                         itos = ntohl(itos32) >> 20;
  483                         ipo->ip_p = IPPROTO_IPV6;
  484                         ipo->ip_off = 0;
  485                 }
  486 #endif /* INET6 */
  487                 else {
  488                         goto nofamily;
  489                 }
  490 
  491                 otos = 0;
  492                 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
  493                 ipo->ip_tos = otos;
  494                 break;
  495 #endif /* INET */
  496 
  497 #ifdef INET6
  498         case AF_INET6:
  499                 if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) ||
  500                     saidx->src.sa.sa_family != AF_INET6 ||
  501                     IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) {
  502                         DPRINTF(("%s: unspecified tunnel endpoint "
  503                             "address in SA %s/%08lx\n", __func__,
  504                             ipsec_address(&saidx->dst),
  505                             (u_long) ntohl(sav->spi)));
  506                         ipipstat.ipips_unspec++;
  507                         error = ENOBUFS;
  508                         goto bad;
  509                 }
  510 
  511                 /* scoped address handling */
  512                 ip6 = mtod(m, struct ip6_hdr *);
  513                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
  514                         ip6->ip6_src.s6_addr16[1] = 0;
  515                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
  516                         ip6->ip6_dst.s6_addr16[1] = 0;
  517 
  518                 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
  519                 if (m == 0) {
  520                         DPRINTF(("%s: M_PREPEND failed\n", __func__));
  521                         ipipstat.ipips_hdrops++;
  522                         error = ENOBUFS;
  523                         goto bad;
  524                 }
  525 
  526                 /* Initialize IPv6 header */
  527                 ip6o = mtod(m, struct ip6_hdr *);
  528                 ip6o->ip6_flow = 0;
  529                 ip6o->ip6_vfc &= ~IPV6_VERSION_MASK;
  530                 ip6o->ip6_vfc |= IPV6_VERSION;
  531                 ip6o->ip6_plen = htons(m->m_pkthdr.len);
  532                 ip6o->ip6_hlim = ip_defttl;
  533                 ip6o->ip6_dst = saidx->dst.sin6.sin6_addr;
  534                 ip6o->ip6_src = saidx->src.sin6.sin6_addr;
  535 
  536 #ifdef INET
  537                 if (tp == IPVERSION) {
  538                         /* Save ECN notification */
  539                         m_copydata(m, sizeof(struct ip6_hdr) +
  540                             offsetof(struct ip, ip_tos), sizeof(u_int8_t),
  541                             (caddr_t) &itos);
  542 
  543                         /* This is really IPVERSION. */
  544                         ip6o->ip6_nxt = IPPROTO_IPIP;
  545                 } else
  546 #endif /* INET */
  547                         if (tp == (IPV6_VERSION >> 4)) {
  548                                 u_int32_t itos32;
  549 
  550                                 /* Save ECN notification. */
  551                                 m_copydata(m, sizeof(struct ip6_hdr) +
  552                                     offsetof(struct ip6_hdr, ip6_flow),
  553                                     sizeof(u_int32_t), (caddr_t) &itos32);
  554                                 itos = ntohl(itos32) >> 20;
  555 
  556                                 ip6o->ip6_nxt = IPPROTO_IPV6;
  557                         } else {
  558                                 goto nofamily;
  559                         }
  560 
  561                 otos = 0;
  562                 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
  563                 ip6o->ip6_flow |= htonl((u_int32_t) otos << 20);
  564                 break;
  565 #endif /* INET6 */
  566 
  567         default:
  568 nofamily:
  569                 DPRINTF(("%s: unsupported protocol family %u\n", __func__,
  570                     saidx->dst.sa.sa_family));
  571                 ipipstat.ipips_family++;
  572                 error = EAFNOSUPPORT;           /* XXX diffs from openbsd */
  573                 goto bad;
  574         }
  575 
  576         ipipstat.ipips_opackets++;
  577         *mp = m;
  578 
  579 #ifdef INET
  580         if (saidx->dst.sa.sa_family == AF_INET) {
  581 #if 0
  582                 if (sav->tdb_xform->xf_type == XF_IP4)
  583                         tdb->tdb_cur_bytes +=
  584                             m->m_pkthdr.len - sizeof(struct ip);
  585 #endif
  586                 ipipstat.ipips_obytes += m->m_pkthdr.len - sizeof(struct ip);
  587         }
  588 #endif /* INET */
  589 
  590 #ifdef INET6
  591         if (saidx->dst.sa.sa_family == AF_INET6) {
  592 #if 0
  593                 if (sav->tdb_xform->xf_type == XF_IP4)
  594                         tdb->tdb_cur_bytes +=
  595                             m->m_pkthdr.len - sizeof(struct ip6_hdr);
  596 #endif
  597                 ipipstat.ipips_obytes +=
  598                     m->m_pkthdr.len - sizeof(struct ip6_hdr);
  599         }
  600 #endif /* INET6 */
  601 
  602         return 0;
  603 bad:
  604         if (m)
  605                 m_freem(m);
  606         *mp = NULL;
  607         return (error);
  608 }
  609 
  610 #ifdef FAST_IPSEC
  611 static int
  612 ipe4_init(struct secasvar *sav, struct xformsw *xsp)
  613 {
  614         sav->tdb_xform = xsp;
  615         return 0;
  616 }
  617 
  618 static int
  619 ipe4_zeroize(struct secasvar *sav)
  620 {
  621         sav->tdb_xform = NULL;
  622         return 0;
  623 }
  624 
  625 static int
  626 ipe4_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  627 {
  628         /* This is a rather serious mistake, so no conditional printing. */
  629         printf("%s: should never be called\n", __func__);
  630         if (m)
  631                 m_freem(m);
  632         return EOPNOTSUPP;
  633 }
  634 
  635 static struct xformsw ipe4_xformsw = {
  636         XF_IP4,         0,              "IPv4 Simple Encapsulation",
  637         ipe4_init,      ipe4_zeroize,   ipe4_input,     ipip_output,
  638 };
  639 
  640 extern struct domain inetdomain;
  641 static struct ipprotosw ipe4_protosw[] = {
  642 { SOCK_RAW,     &inetdomain,    IPPROTO_IPV4,   PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  643   (pr_in_input_t*) ip4_input,
  644                 0,              0,              rip_ctloutput,
  645   0,
  646   0,            0,              0,              0,
  647   &rip_usrreqs
  648 },
  649 #ifdef INET6
  650 { SOCK_RAW,     &inetdomain,    IPPROTO_IPV6,   PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  651   (pr_in_input_t*) ip4_input,
  652                 0,              0,              rip_ctloutput,
  653   0,
  654   0,            0,              0,              0,
  655   &rip_usrreqs
  656 }
  657 #endif
  658 };
  659 
  660 /*
  661  * Check the encapsulated packet to see if we want it
  662  */
  663 static int
  664 ipe4_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
  665 {
  666         /*
  667          * Only take packets coming from IPSEC tunnels; the rest
  668          * must be handled by the gif tunnel code.  Note that we
  669          * also return a minimum priority when we want the packet
  670          * so any explicit gif tunnels take precedence.
  671          */
  672         return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0);
  673 }
  674 
  675 static void
  676 ipe4_attach(void)
  677 {
  678         xform_register(&ipe4_xformsw);
  679         /* attach to encapsulation framework */
  680         /* XXX save return cookie for detach on module remove */
  681         (void) encap_attach_func(AF_INET, -1,
  682                 ipe4_encapcheck, (struct protosw*) &ipe4_protosw[0], NULL);
  683 #ifdef INET6
  684         (void) encap_attach_func(AF_INET6, -1,
  685                 ipe4_encapcheck, (struct protosw*) &ipe4_protosw[1], NULL);
  686 #endif
  687 }
  688 SYSINIT(ipe4_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipe4_attach, NULL);
  689 #endif  /* FAST_IPSEC */

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