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

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    1 /*      $FreeBSD: src/sys/netipsec/xform_ipip.c,v 1.11.2.2 2006/07/24 23:20:59 thompsa Exp $    */
    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 #include "opt_enc.h"
   45 
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/mbuf.h>
   49 #include <sys/socket.h>
   50 #include <sys/kernel.h>
   51 #include <sys/protosw.h>
   52 #include <sys/sysctl.h>
   53 
   54 #include <net/if.h>
   55 #include <net/route.h>
   56 #include <net/netisr.h>
   57 
   58 #include <netinet/in.h>
   59 #include <netinet/in_systm.h>
   60 #include <netinet/in_var.h>
   61 #include <netinet/ip.h>
   62 #include <netinet/ip_ecn.h>
   63 #include <netinet/ip_var.h>
   64 #include <netinet/ip_encap.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, int off)
  133 {
  134 #if 0
  135         /* If we do not accept IP-in-IP explicitly, drop.  */
  136         if (!ipip_allow && (m->m_flags & M_IPSEC) == 0) {
  137                 DPRINTF(("%s: dropped due to policy\n", __func__));
  138                 ipipstat.ipips_pdrops++;
  139                 m_freem(m);
  140                 return;
  141         }
  142 #endif
  143         _ipip_input(m, off, NULL);
  144 }
  145 #endif /* INET */
  146 
  147 /*
  148  * ipip_input gets called when we receive an IP{46} encapsulated packet,
  149  * either because we got it at a real interface, or because AH or ESP
  150  * were being used in tunnel mode (in which case the rcvif element will
  151  * contain the address of the encX interface associated with the tunnel.
  152  */
  153 
  154 static void
  155 _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp)
  156 {
  157         register struct sockaddr_in *sin;
  158         register struct ifnet *ifp;
  159         register struct ifaddr *ifa;
  160         struct ip *ipo;
  161 #ifdef INET6
  162         register struct sockaddr_in6 *sin6;
  163         struct ip6_hdr *ip6 = NULL;
  164         u_int8_t itos;
  165 #endif
  166         u_int8_t nxt;
  167         int isr;
  168         u_int8_t otos;
  169         u_int8_t v;
  170         int hlen;
  171 
  172         ipipstat.ipips_ipackets++;
  173 
  174         m_copydata(m, 0, 1, &v);
  175 
  176         switch (v >> 4) {
  177 #ifdef INET
  178         case 4:
  179                 hlen = sizeof(struct ip);
  180                 break;
  181 #endif /* INET */
  182 #ifdef INET6
  183         case 6:
  184                 hlen = sizeof(struct ip6_hdr);
  185                 break;
  186 #endif
  187         default:
  188                 ipipstat.ipips_family++;
  189                 m_freem(m);
  190                 return /* EAFNOSUPPORT */;
  191         }
  192 
  193         /* Bring the IP header in the first mbuf, if not there already */
  194         if (m->m_len < hlen) {
  195                 if ((m = m_pullup(m, hlen)) == NULL) {
  196                         DPRINTF(("%s: m_pullup (1) failed\n", __func__));
  197                         ipipstat.ipips_hdrops++;
  198                         return;
  199                 }
  200         }
  201 
  202         ipo = mtod(m, struct ip *);
  203 
  204 #ifdef MROUTING
  205         if (ipo->ip_v == IPVERSION && ipo->ip_p == IPPROTO_IPV4) {
  206                 if (IN_MULTICAST(((struct ip *)((char *) ipo + iphlen))->ip_dst.s_addr)) {
  207                         ipip_mroute_input (m, iphlen);
  208                         return;
  209                 }
  210         }
  211 #endif /* MROUTING */
  212 
  213         /* Keep outer ecn field. */
  214         switch (v >> 4) {
  215 #ifdef INET
  216         case 4:
  217                 otos = ipo->ip_tos;
  218                 break;
  219 #endif /* INET */
  220 #ifdef INET6
  221         case 6:
  222                 otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff;
  223                 break;
  224 #endif
  225         default:
  226                 panic("ipip_input: unknown ip version %u (outer)", v>>4);
  227         }
  228 
  229         /* Remove outer IP header */
  230         m_adj(m, iphlen);
  231 
  232         /* Sanity check */
  233         if (m->m_pkthdr.len < sizeof(struct ip))  {
  234                 ipipstat.ipips_hdrops++;
  235                 m_freem(m);
  236                 return;
  237         }
  238 
  239         m_copydata(m, 0, 1, &v);
  240 
  241         switch (v >> 4) {
  242 #ifdef INET
  243         case 4:
  244                 hlen = sizeof(struct ip);
  245                 break;
  246 #endif /* INET */
  247 
  248 #ifdef INET6
  249         case 6:
  250                 hlen = sizeof(struct ip6_hdr);
  251                 break;
  252 #endif
  253         default:
  254                 ipipstat.ipips_family++;
  255                 m_freem(m);
  256                 return; /* EAFNOSUPPORT */
  257         }
  258 
  259         /*
  260          * Bring the inner IP header in the first mbuf, if not there already.
  261          */
  262         if (m->m_len < hlen) {
  263                 if ((m = m_pullup(m, hlen)) == NULL) {
  264                         DPRINTF(("%s: m_pullup (2) failed\n", __func__));
  265                         ipipstat.ipips_hdrops++;
  266                         return;
  267                 }
  268         }
  269 
  270         /*
  271          * RFC 1853 specifies that the inner TTL should not be touched on
  272          * decapsulation. There's no reason this comment should be here, but
  273          * this is as good as any a position.
  274          */
  275 
  276         /* Some sanity checks in the inner IP header */
  277         switch (v >> 4) {
  278 #ifdef INET
  279         case 4:
  280                 ipo = mtod(m, struct ip *);
  281                 nxt = ipo->ip_p;
  282                 ip_ecn_egress(ip4_ipsec_ecn, &otos, &ipo->ip_tos);
  283                 break;
  284 #endif /* INET */
  285 #ifdef INET6
  286         case 6:
  287                 ip6 = (struct ip6_hdr *) ipo;
  288                 nxt = ip6->ip6_nxt;
  289                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  290                 ip_ecn_egress(ip6_ipsec_ecn, &otos, &itos);
  291                 ip6->ip6_flow &= ~htonl(0xff << 20);
  292                 ip6->ip6_flow |= htonl((u_int32_t) itos << 20);
  293                 break;
  294 #endif
  295         default:
  296                 panic("ipip_input: unknown ip version %u (inner)", v>>4);
  297         }
  298 
  299         /* Check for local address spoofing. */
  300         if ((m->m_pkthdr.rcvif == NULL ||
  301             !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) &&
  302             ipip_allow != 2) {
  303                 IFNET_RLOCK();
  304                 TAILQ_FOREACH(ifp, &ifnet, if_link) {
  305                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  306 #ifdef INET
  307                                 if (ipo) {
  308                                         if (ifa->ifa_addr->sa_family !=
  309                                             AF_INET)
  310                                                 continue;
  311 
  312                                         sin = (struct sockaddr_in *) ifa->ifa_addr;
  313 
  314                                         if (sin->sin_addr.s_addr ==
  315                                             ipo->ip_src.s_addr) {
  316                                                 ipipstat.ipips_spoof++;
  317                                                 m_freem(m);
  318                                                 IFNET_RUNLOCK();
  319                                                 return;
  320                                         }
  321                                 }
  322 #endif /* INET */
  323 
  324 #ifdef INET6
  325                                 if (ip6) {
  326                                         if (ifa->ifa_addr->sa_family !=
  327                                             AF_INET6)
  328                                                 continue;
  329 
  330                                         sin6 = (struct sockaddr_in6 *) ifa->ifa_addr;
  331 
  332                                         if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_src)) {
  333                                                 ipipstat.ipips_spoof++;
  334                                                 m_freem(m);
  335                                                 IFNET_RUNLOCK();
  336                                                 return;
  337                                         }
  338 
  339                                 }
  340 #endif /* INET6 */
  341                         }
  342                 }
  343                 IFNET_RUNLOCK();
  344         }
  345 
  346         /* Statistics */
  347         ipipstat.ipips_ibytes += m->m_pkthdr.len - iphlen;
  348 
  349 #ifdef DEV_ENC
  350         /* pass the mbuf to enc0 for packet filtering */
  351         if (ipsec_filter(&m, 1) != 0)
  352                 return;
  353 #endif
  354 
  355         /*
  356          * Interface pointer stays the same; if no IPsec processing has
  357          * been done (or will be done), this will point to a normal
  358          * interface. Otherwise, it'll point to an enc interface, which
  359          * will allow a packet filter to distinguish between secure and
  360          * untrusted packets.
  361          */
  362 
  363         switch (v >> 4) {
  364 #ifdef INET
  365         case 4:
  366                 isr = NETISR_IP;
  367                 break;
  368 #endif
  369 #ifdef INET6
  370         case 6:
  371                 isr = NETISR_IPV6;
  372                 break;
  373 #endif
  374         default:
  375                 panic("%s: bogus ip version %u", __func__, v>>4);
  376         }
  377 
  378         if (netisr_queue(isr, m)) {     /* (0) on success. */
  379                 ipipstat.ipips_qfull++;
  380                 DPRINTF(("%s: packet dropped because of full queue\n",
  381                         __func__));
  382         }
  383 }
  384 
  385 int
  386 ipip_output(
  387         struct mbuf *m,
  388         struct ipsecrequest *isr,
  389         struct mbuf **mp,
  390         int skip,
  391         int protoff
  392 )
  393 {
  394         struct secasvar *sav;
  395         u_int8_t tp, otos;
  396         struct secasindex *saidx;
  397         int error;
  398 #ifdef INET
  399         u_int8_t itos;
  400         struct ip *ipo;
  401 #endif /* INET */
  402 #ifdef INET6
  403         struct ip6_hdr *ip6, *ip6o;
  404 #endif /* INET6 */
  405 
  406         IPSEC_SPLASSERT_SOFTNET(__func__);
  407 
  408         sav = isr->sav;
  409         IPSEC_ASSERT(sav != NULL, ("null SA"));
  410         IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
  411 
  412         /* XXX Deal with empty TDB source/destination addresses. */
  413 
  414         m_copydata(m, 0, 1, &tp);
  415         tp = (tp >> 4) & 0xff;  /* Get the IP version number. */
  416 
  417         saidx = &sav->sah->saidx;
  418         switch (saidx->dst.sa.sa_family) {
  419 #ifdef INET
  420         case AF_INET:
  421                 if (saidx->src.sa.sa_family != AF_INET ||
  422                     saidx->src.sin.sin_addr.s_addr == INADDR_ANY ||
  423                     saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) {
  424                         DPRINTF(("%s: unspecified tunnel endpoint "
  425                             "address in SA %s/%08lx\n", __func__,
  426                             ipsec_address(&saidx->dst),
  427                             (u_long) ntohl(sav->spi)));
  428                         ipipstat.ipips_unspec++;
  429                         error = EINVAL;
  430                         goto bad;
  431                 }
  432 
  433                 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
  434                 if (m == 0) {
  435                         DPRINTF(("%s: M_PREPEND failed\n", __func__));
  436                         ipipstat.ipips_hdrops++;
  437                         error = ENOBUFS;
  438                         goto bad;
  439                 }
  440 
  441                 ipo = mtod(m, struct ip *);
  442 
  443                 ipo->ip_v = IPVERSION;
  444                 ipo->ip_hl = 5;
  445                 ipo->ip_len = htons(m->m_pkthdr.len);
  446                 ipo->ip_ttl = ip_defttl;
  447                 ipo->ip_sum = 0;
  448                 ipo->ip_src = saidx->src.sin.sin_addr;
  449                 ipo->ip_dst = saidx->dst.sin.sin_addr;
  450 
  451                 ipo->ip_id = ip_newid();
  452 
  453                 /* If the inner protocol is IP... */
  454                 if (tp == IPVERSION) {
  455                         /* Save ECN notification */
  456                         m_copydata(m, sizeof(struct ip) +
  457                             offsetof(struct ip, ip_tos),
  458                             sizeof(u_int8_t), (caddr_t) &itos);
  459 
  460                         ipo->ip_p = IPPROTO_IPIP;
  461 
  462                         /*
  463                          * We should be keeping tunnel soft-state and
  464                          * send back ICMPs if needed.
  465                          */
  466                         m_copydata(m, sizeof(struct ip) +
  467                             offsetof(struct ip, ip_off),
  468                             sizeof(u_int16_t), (caddr_t) &ipo->ip_off);
  469                         ipo->ip_off = ntohs(ipo->ip_off);
  470                         ipo->ip_off &= ~(IP_DF | IP_MF | IP_OFFMASK);
  471                         ipo->ip_off = htons(ipo->ip_off);
  472                 }
  473 #ifdef INET6
  474                 else if (tp == (IPV6_VERSION >> 4)) {
  475                         u_int32_t itos32;
  476 
  477                         /* Save ECN notification. */
  478                         m_copydata(m, sizeof(struct ip) +
  479                             offsetof(struct ip6_hdr, ip6_flow),
  480                             sizeof(u_int32_t), (caddr_t) &itos32);
  481                         itos = ntohl(itos32) >> 20;
  482                         ipo->ip_p = IPPROTO_IPV6;
  483                         ipo->ip_off = 0;
  484                 }
  485 #endif /* INET6 */
  486                 else {
  487                         goto nofamily;
  488                 }
  489 
  490                 otos = 0;
  491                 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
  492                 ipo->ip_tos = otos;
  493                 break;
  494 #endif /* INET */
  495 
  496 #ifdef INET6
  497         case AF_INET6:
  498                 if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) ||
  499                     saidx->src.sa.sa_family != AF_INET6 ||
  500                     IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) {
  501                         DPRINTF(("%s: unspecified tunnel endpoint "
  502                             "address in SA %s/%08lx\n", __func__,
  503                             ipsec_address(&saidx->dst),
  504                             (u_long) ntohl(sav->spi)));
  505                         ipipstat.ipips_unspec++;
  506                         error = ENOBUFS;
  507                         goto bad;
  508                 }
  509 
  510                 /* scoped address handling */
  511                 ip6 = mtod(m, struct ip6_hdr *);
  512                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
  513                         ip6->ip6_src.s6_addr16[1] = 0;
  514                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
  515                         ip6->ip6_dst.s6_addr16[1] = 0;
  516 
  517                 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
  518                 if (m == 0) {
  519                         DPRINTF(("%s: M_PREPEND failed\n", __func__));
  520                         ipipstat.ipips_hdrops++;
  521                         error = ENOBUFS;
  522                         goto bad;
  523                 }
  524 
  525                 /* Initialize IPv6 header */
  526                 ip6o = mtod(m, struct ip6_hdr *);
  527                 ip6o->ip6_flow = 0;
  528                 ip6o->ip6_vfc &= ~IPV6_VERSION_MASK;
  529                 ip6o->ip6_vfc |= IPV6_VERSION;
  530                 ip6o->ip6_plen = htons(m->m_pkthdr.len);
  531                 ip6o->ip6_hlim = ip_defttl;
  532                 ip6o->ip6_dst = saidx->dst.sin6.sin6_addr;
  533                 ip6o->ip6_src = saidx->src.sin6.sin6_addr;
  534 
  535 #ifdef INET
  536                 if (tp == IPVERSION) {
  537                         /* Save ECN notification */
  538                         m_copydata(m, sizeof(struct ip6_hdr) +
  539                             offsetof(struct ip, ip_tos), sizeof(u_int8_t),
  540                             (caddr_t) &itos);
  541 
  542                         /* This is really IPVERSION. */
  543                         ip6o->ip6_nxt = IPPROTO_IPIP;
  544                 } else
  545 #endif /* INET */
  546                         if (tp == (IPV6_VERSION >> 4)) {
  547                                 u_int32_t itos32;
  548 
  549                                 /* Save ECN notification. */
  550                                 m_copydata(m, sizeof(struct ip6_hdr) +
  551                                     offsetof(struct ip6_hdr, ip6_flow),
  552                                     sizeof(u_int32_t), (caddr_t) &itos32);
  553                                 itos = ntohl(itos32) >> 20;
  554 
  555                                 ip6o->ip6_nxt = IPPROTO_IPV6;
  556                         } else {
  557                                 goto nofamily;
  558                         }
  559 
  560                 otos = 0;
  561                 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
  562                 ip6o->ip6_flow |= htonl((u_int32_t) otos << 20);
  563                 break;
  564 #endif /* INET6 */
  565 
  566         default:
  567 nofamily:
  568                 DPRINTF(("%s: unsupported protocol family %u\n", __func__,
  569                     saidx->dst.sa.sa_family));
  570                 ipipstat.ipips_family++;
  571                 error = EAFNOSUPPORT;           /* XXX diffs from openbsd */
  572                 goto bad;
  573         }
  574 
  575         ipipstat.ipips_opackets++;
  576         *mp = m;
  577 
  578 #ifdef INET
  579         if (saidx->dst.sa.sa_family == AF_INET) {
  580 #if 0
  581                 if (sav->tdb_xform->xf_type == XF_IP4)
  582                         tdb->tdb_cur_bytes +=
  583                             m->m_pkthdr.len - sizeof(struct ip);
  584 #endif
  585                 ipipstat.ipips_obytes += m->m_pkthdr.len - sizeof(struct ip);
  586         }
  587 #endif /* INET */
  588 
  589 #ifdef INET6
  590         if (saidx->dst.sa.sa_family == AF_INET6) {
  591 #if 0
  592                 if (sav->tdb_xform->xf_type == XF_IP4)
  593                         tdb->tdb_cur_bytes +=
  594                             m->m_pkthdr.len - sizeof(struct ip6_hdr);
  595 #endif
  596                 ipipstat.ipips_obytes +=
  597                     m->m_pkthdr.len - sizeof(struct ip6_hdr);
  598         }
  599 #endif /* INET6 */
  600 
  601         return 0;
  602 bad:
  603         if (m)
  604                 m_freem(m);
  605         *mp = NULL;
  606         return (error);
  607 }
  608 
  609 #ifdef FAST_IPSEC
  610 static int
  611 ipe4_init(struct secasvar *sav, struct xformsw *xsp)
  612 {
  613         sav->tdb_xform = xsp;
  614         return 0;
  615 }
  616 
  617 static int
  618 ipe4_zeroize(struct secasvar *sav)
  619 {
  620         sav->tdb_xform = NULL;
  621         return 0;
  622 }
  623 
  624 static int
  625 ipe4_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  626 {
  627         /* This is a rather serious mistake, so no conditional printing. */
  628         printf("%s: should never be called\n", __func__);
  629         if (m)
  630                 m_freem(m);
  631         return EOPNOTSUPP;
  632 }
  633 
  634 static struct xformsw ipe4_xformsw = {
  635         XF_IP4,         0,              "IPv4 Simple Encapsulation",
  636         ipe4_init,      ipe4_zeroize,   ipe4_input,     ipip_output,
  637 };
  638 
  639 extern struct domain inetdomain;
  640 static struct protosw ipe4_protosw =
  641 { SOCK_RAW,     &inetdomain,    IPPROTO_IPV4,   PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  642   ip4_input,
  643                 0,              0,              rip_ctloutput,
  644   0,
  645   0,            0,              0,              0,
  646   &rip_usrreqs
  647 };
  648 #ifdef INET6
  649 static struct ip6protosw ipe6_protosw =
  650 { SOCK_RAW,     &inetdomain,    IPPROTO_IPV6,   PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  651   ip4_input6,
  652                 0,              0,              rip_ctloutput,
  653   0,
  654   0,            0,              0,              0,
  655   &rip_usrreqs
  656 };
  657 #endif
  658 
  659 /*
  660  * Check the encapsulated packet to see if we want it
  661  */
  662 static int
  663 ipe4_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
  664 {
  665         /*
  666          * Only take packets coming from IPSEC tunnels; the rest
  667          * must be handled by the gif tunnel code.  Note that we
  668          * also return a minimum priority when we want the packet
  669          * so any explicit gif tunnels take precedence.
  670          */
  671         return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0);
  672 }
  673 
  674 static void
  675 ipe4_attach(void)
  676 {
  677         xform_register(&ipe4_xformsw);
  678         /* attach to encapsulation framework */
  679         /* XXX save return cookie for detach on module remove */
  680         (void) encap_attach_func(AF_INET, -1,
  681                 ipe4_encapcheck, &ipe4_protosw, NULL);
  682 #ifdef INET6
  683         (void) encap_attach_func(AF_INET6, -1,
  684                 ipe4_encapcheck, (struct protosw *)&ipe6_protosw, NULL);
  685 #endif
  686 }
  687 SYSINIT(ipe4_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipe4_attach, NULL);
  688 #endif  /* FAST_IPSEC */

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