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

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    1 /*      $FreeBSD: releng/5.2/sys/netipsec/xform_ipip.c 120585 2003-09-29 22:57:43Z sam $        */
    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_random_ip_id.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 #include <netinet/ipprotosw.h>
   66 
   67 #include <netipsec/ipsec.h>
   68 #include <netipsec/xform.h>
   69 
   70 #include <netipsec/ipip_var.h>
   71 
   72 #ifdef MROUTING
   73 #include <netinet/ip_mroute.h>
   74 #endif
   75 
   76 #ifdef INET6
   77 #include <netinet/ip6.h>
   78 #include <netipsec/ipsec6.h>
   79 #include <netinet6/ip6_ecn.h>
   80 #include <netinet6/in6_var.h>
   81 #include <netinet6/ip6protosw.h>
   82 #endif
   83 
   84 #include <netipsec/key.h>
   85 #include <netipsec/key_debug.h>
   86 
   87 #include <machine/stdarg.h>
   88 
   89 /*
   90  * We can control the acceptance of IP4 packets by altering the sysctl
   91  * net.inet.ipip.allow value.  Zero means drop them, all else is acceptance.
   92  */
   93 int     ipip_allow = 0;
   94 struct  ipipstat ipipstat;
   95 
   96 SYSCTL_DECL(_net_inet_ipip);
   97 SYSCTL_INT(_net_inet_ipip, OID_AUTO,
   98         ipip_allow,     CTLFLAG_RW,     &ipip_allow,    0, "");
   99 SYSCTL_STRUCT(_net_inet_ipip, IPSECCTL_STATS,
  100         stats,          CTLFLAG_RD,     &ipipstat,      ipipstat, "");
  101 
  102 /* XXX IPCOMP */
  103 #define M_IPSEC (M_AUTHIPHDR|M_AUTHIPDGM|M_DECRYPTED)
  104 
  105 static void _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp);
  106 
  107 #ifdef INET6
  108 /*
  109  * Really only a wrapper for ipip_input(), for use with IPv6.
  110  */
  111 int
  112 ip4_input6(struct mbuf **m, int *offp, int proto)
  113 {
  114 #if 0
  115         /* If we do not accept IP-in-IP explicitly, drop.  */
  116         if (!ipip_allow && ((*m)->m_flags & M_IPSEC) == 0) {
  117                 DPRINTF(("%s: dropped due to policy\n", __func__));
  118                 ipipstat.ipips_pdrops++;
  119                 m_freem(*m);
  120                 return IPPROTO_DONE;
  121         }
  122 #endif
  123         _ipip_input(*m, *offp, NULL);
  124         return IPPROTO_DONE;
  125 }
  126 #endif /* INET6 */
  127 
  128 #ifdef INET
  129 /*
  130  * Really only a wrapper for ipip_input(), for use with IPv4.
  131  */
  132 void
  133 ip4_input(struct mbuf *m, ...)
  134 {
  135         va_list ap;
  136         int iphlen;
  137 
  138 #if 0
  139         /* If we do not accept IP-in-IP explicitly, drop.  */
  140         if (!ipip_allow && (m->m_flags & M_IPSEC) == 0) {
  141                 DPRINTF(("%s: dropped due to policy\n", __func__));
  142                 ipipstat.ipips_pdrops++;
  143                 m_freem(m);
  144                 return;
  145         }
  146 #endif
  147         va_start(ap, m);
  148         iphlen = va_arg(ap, int);
  149         va_end(ap);
  150 
  151         _ipip_input(m, iphlen, NULL);
  152 }
  153 #endif /* INET */
  154 
  155 /*
  156  * ipip_input gets called when we receive an IP{46} encapsulated packet,
  157  * either because we got it at a real interface, or because AH or ESP
  158  * were being used in tunnel mode (in which case the rcvif element will
  159  * contain the address of the encX interface associated with the tunnel.
  160  */
  161 
  162 static void
  163 _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp)
  164 {
  165         register struct sockaddr_in *sin;
  166         register struct ifnet *ifp;
  167         register struct ifaddr *ifa;
  168         struct ip *ipo;
  169 #ifdef INET6
  170         register struct sockaddr_in6 *sin6;
  171         struct ip6_hdr *ip6 = NULL;
  172         u_int8_t itos;
  173 #endif
  174         u_int8_t nxt;
  175         int isr;
  176         u_int8_t otos;
  177         u_int8_t v;
  178         int hlen;
  179 
  180         ipipstat.ipips_ipackets++;
  181 
  182         m_copydata(m, 0, 1, &v);
  183 
  184         switch (v >> 4) {
  185 #ifdef INET
  186         case 4:
  187                 hlen = sizeof(struct ip);
  188                 break;
  189 #endif /* INET */
  190 #ifdef INET6
  191         case 6:
  192                 hlen = sizeof(struct ip6_hdr);
  193                 break;
  194 #endif
  195         default:
  196                 ipipstat.ipips_family++;
  197                 m_freem(m);
  198                 return /* EAFNOSUPPORT */;
  199         }
  200 
  201         /* Bring the IP header in the first mbuf, if not there already */
  202         if (m->m_len < hlen) {
  203                 if ((m = m_pullup(m, hlen)) == NULL) {
  204                         DPRINTF(("%s: m_pullup (1) failed\n", __func__));
  205                         ipipstat.ipips_hdrops++;
  206                         return;
  207                 }
  208         }
  209 
  210         ipo = mtod(m, struct ip *);
  211 
  212 #ifdef MROUTING
  213         if (ipo->ip_v == IPVERSION && ipo->ip_p == IPPROTO_IPV4) {
  214                 if (IN_MULTICAST(((struct ip *)((char *) ipo + iphlen))->ip_dst.s_addr)) {
  215                         ipip_mroute_input (m, iphlen);
  216                         return;
  217                 }
  218         }
  219 #endif /* MROUTING */
  220 
  221         /* Keep outer ecn field. */
  222         switch (v >> 4) {
  223 #ifdef INET
  224         case 4:
  225                 otos = ipo->ip_tos;
  226                 break;
  227 #endif /* INET */
  228 #ifdef INET6
  229         case 6:
  230                 otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff;
  231                 break;
  232 #endif
  233         default:
  234                 panic("ipip_input: unknown ip version %u (outer)", v>>4);
  235         }
  236 
  237         /* Remove outer IP header */
  238         m_adj(m, iphlen);
  239 
  240         /* Sanity check */
  241         if (m->m_pkthdr.len < sizeof(struct ip))  {
  242                 ipipstat.ipips_hdrops++;
  243                 m_freem(m);
  244                 return;
  245         }
  246 
  247         m_copydata(m, 0, 1, &v);
  248 
  249         switch (v >> 4) {
  250 #ifdef INET
  251         case 4:
  252                 hlen = sizeof(struct ip);
  253                 break;
  254 #endif /* INET */
  255 
  256 #ifdef INET6
  257         case 6:
  258                 hlen = sizeof(struct ip6_hdr);
  259                 break;
  260 #endif
  261         default:
  262                 ipipstat.ipips_family++;
  263                 m_freem(m);
  264                 return; /* EAFNOSUPPORT */
  265         }
  266 
  267         /*
  268          * Bring the inner IP header in the first mbuf, if not there already.
  269          */
  270         if (m->m_len < hlen) {
  271                 if ((m = m_pullup(m, hlen)) == NULL) {
  272                         DPRINTF(("%s: m_pullup (2) failed\n", __func__));
  273                         ipipstat.ipips_hdrops++;
  274                         return;
  275                 }
  276         }
  277 
  278         /*
  279          * RFC 1853 specifies that the inner TTL should not be touched on
  280          * decapsulation. There's no reason this comment should be here, but
  281          * this is as good as any a position.
  282          */
  283 
  284         /* Some sanity checks in the inner IP header */
  285         switch (v >> 4) {
  286 #ifdef INET
  287         case 4:
  288                 ipo = mtod(m, struct ip *);
  289                 nxt = ipo->ip_p;
  290                 ip_ecn_egress(ip4_ipsec_ecn, &otos, &ipo->ip_tos);
  291                 break;
  292 #endif /* INET */
  293 #ifdef INET6
  294         case 6:
  295                 ip6 = (struct ip6_hdr *) ipo;
  296                 nxt = ip6->ip6_nxt;
  297                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  298                 ip_ecn_egress(ip6_ipsec_ecn, &otos, &itos);
  299                 ip6->ip6_flow &= ~htonl(0xff << 20);
  300                 ip6->ip6_flow |= htonl((u_int32_t) itos << 20);
  301                 break;
  302 #endif
  303         default:
  304                 panic("ipip_input: unknown ip version %u (inner)", v>>4);
  305         }
  306 
  307         /* Check for local address spoofing. */
  308         if ((m->m_pkthdr.rcvif == NULL ||
  309             !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) &&
  310             ipip_allow != 2) {
  311                 IFNET_RLOCK();
  312                 for (ifp = ifnet.tqh_first; ifp != 0;
  313                      ifp = ifp->if_list.tqe_next) {
  314                         for (ifa = ifp->if_addrlist.tqh_first; ifa != 0;
  315                              ifa = ifa->ifa_list.tqe_next) {
  316 #ifdef INET
  317                                 if (ipo) {
  318                                         if (ifa->ifa_addr->sa_family !=
  319                                             AF_INET)
  320                                                 continue;
  321 
  322                                         sin = (struct sockaddr_in *) ifa->ifa_addr;
  323 
  324                                         if (sin->sin_addr.s_addr ==
  325                                             ipo->ip_src.s_addr) {
  326                                                 ipipstat.ipips_spoof++;
  327                                                 m_freem(m);
  328                                                 IFNET_RUNLOCK();
  329                                                 return;
  330                                         }
  331                                 }
  332 #endif /* INET */
  333 
  334 #ifdef INET6
  335                                 if (ip6) {
  336                                         if (ifa->ifa_addr->sa_family !=
  337                                             AF_INET6)
  338                                                 continue;
  339 
  340                                         sin6 = (struct sockaddr_in6 *) ifa->ifa_addr;
  341 
  342                                         if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_src)) {
  343                                                 ipipstat.ipips_spoof++;
  344                                                 m_freem(m);
  345                                                 IFNET_RUNLOCK();
  346                                                 return;
  347                                         }
  348 
  349                                 }
  350 #endif /* INET6 */
  351                         }
  352                 }
  353                 IFNET_RUNLOCK();
  354         }
  355 
  356         /* Statistics */
  357         ipipstat.ipips_ibytes += m->m_pkthdr.len - iphlen;
  358 
  359         /*
  360          * Interface pointer stays the same; if no IPsec processing has
  361          * been done (or will be done), this will point to a normal
  362          * interface. Otherwise, it'll point to an enc interface, which
  363          * will allow a packet filter to distinguish between secure and
  364          * untrusted packets.
  365          */
  366 
  367         switch (v >> 4) {
  368 #ifdef INET
  369         case 4:
  370                 isr = NETISR_IP;
  371                 break;
  372 #endif
  373 #ifdef INET6
  374         case 6:
  375                 isr = NETISR_IPV6;
  376                 break;
  377 #endif
  378         default:
  379                 panic("%s: bogus ip version %u", __func__, v>>4);
  380         }
  381 
  382         if (!netisr_queue(isr, m)) {
  383                 ipipstat.ipips_qfull++;
  384                 DPRINTF(("%s: packet dropped because of full queue\n",
  385                         __func__));
  386         }
  387 }
  388 
  389 int
  390 ipip_output(
  391         struct mbuf *m,
  392         struct ipsecrequest *isr,
  393         struct mbuf **mp,
  394         int skip,
  395         int protoff
  396 )
  397 {
  398         struct secasvar *sav;
  399         u_int8_t tp, otos;
  400         struct secasindex *saidx;
  401         int error;
  402 #ifdef INET
  403         u_int8_t itos;
  404         struct ip *ipo;
  405 #endif /* INET */
  406 #ifdef INET6
  407         struct ip6_hdr *ip6, *ip6o;
  408 #endif /* INET6 */
  409 
  410         IPSEC_SPLASSERT_SOFTNET(__func__);
  411 
  412         sav = isr->sav;
  413         IPSEC_ASSERT(sav != NULL, ("null SA"));
  414         IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
  415 
  416         /* XXX Deal with empty TDB source/destination addresses. */
  417 
  418         m_copydata(m, 0, 1, &tp);
  419         tp = (tp >> 4) & 0xff;  /* Get the IP version number. */
  420 
  421         saidx = &sav->sah->saidx;
  422         switch (saidx->dst.sa.sa_family) {
  423 #ifdef INET
  424         case AF_INET:
  425                 if (saidx->src.sa.sa_family != AF_INET ||
  426                     saidx->src.sin.sin_addr.s_addr == INADDR_ANY ||
  427                     saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) {
  428                         DPRINTF(("%s: unspecified tunnel endpoint "
  429                             "address in SA %s/%08lx\n", __func__,
  430                             ipsec_address(&saidx->dst),
  431                             (u_long) ntohl(sav->spi)));
  432                         ipipstat.ipips_unspec++;
  433                         error = EINVAL;
  434                         goto bad;
  435                 }
  436 
  437                 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
  438                 if (m == 0) {
  439                         DPRINTF(("%s: M_PREPEND failed\n", __func__));
  440                         ipipstat.ipips_hdrops++;
  441                         error = ENOBUFS;
  442                         goto bad;
  443                 }
  444 
  445                 ipo = mtod(m, struct ip *);
  446 
  447                 ipo->ip_v = IPVERSION;
  448                 ipo->ip_hl = 5;
  449                 ipo->ip_len = htons(m->m_pkthdr.len);
  450                 ipo->ip_ttl = ip_defttl;
  451                 ipo->ip_sum = 0;
  452                 ipo->ip_src = saidx->src.sin.sin_addr;
  453                 ipo->ip_dst = saidx->dst.sin.sin_addr;
  454 
  455 #ifdef RANDOM_IP_ID
  456                 ipo->ip_id = ip_randomid();
  457 #else
  458                 ipo->ip_id = htons(ip_id++);
  459 #endif
  460 
  461                 /* If the inner protocol is IP... */
  462                 if (tp == IPVERSION) {
  463                         /* Save ECN notification */
  464                         m_copydata(m, sizeof(struct ip) +
  465                             offsetof(struct ip, ip_tos),
  466                             sizeof(u_int8_t), (caddr_t) &itos);
  467 
  468                         ipo->ip_p = IPPROTO_IPIP;
  469 
  470                         /*
  471                          * We should be keeping tunnel soft-state and
  472                          * send back ICMPs if needed.
  473                          */
  474                         m_copydata(m, sizeof(struct ip) +
  475                             offsetof(struct ip, ip_off),
  476                             sizeof(u_int16_t), (caddr_t) &ipo->ip_off);
  477                         ipo->ip_off = ntohs(ipo->ip_off);
  478                         ipo->ip_off &= ~(IP_DF | IP_MF | IP_OFFMASK);
  479                         ipo->ip_off = htons(ipo->ip_off);
  480                 }
  481 #ifdef INET6
  482                 else if (tp == (IPV6_VERSION >> 4)) {
  483                         u_int32_t itos32;
  484 
  485                         /* Save ECN notification. */
  486                         m_copydata(m, sizeof(struct ip) +
  487                             offsetof(struct ip6_hdr, ip6_flow),
  488                             sizeof(u_int32_t), (caddr_t) &itos32);
  489                         itos = ntohl(itos32) >> 20;
  490                         ipo->ip_p = IPPROTO_IPV6;
  491                         ipo->ip_off = 0;
  492                 }
  493 #endif /* INET6 */
  494                 else {
  495                         goto nofamily;
  496                 }
  497 
  498                 otos = 0;
  499                 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
  500                 ipo->ip_tos = otos;
  501                 break;
  502 #endif /* INET */
  503 
  504 #ifdef INET6
  505         case AF_INET6:
  506                 if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) ||
  507                     saidx->src.sa.sa_family != AF_INET6 ||
  508                     IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) {
  509                         DPRINTF(("%s: unspecified tunnel endpoint "
  510                             "address in SA %s/%08lx\n", __func__,
  511                             ipsec_address(&saidx->dst),
  512                             (u_long) ntohl(sav->spi)));
  513                         ipipstat.ipips_unspec++;
  514                         error = ENOBUFS;
  515                         goto bad;
  516                 }
  517 
  518                 /* scoped address handling */
  519                 ip6 = mtod(m, struct ip6_hdr *);
  520                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
  521                         ip6->ip6_src.s6_addr16[1] = 0;
  522                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
  523                         ip6->ip6_dst.s6_addr16[1] = 0;
  524 
  525                 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
  526                 if (m == 0) {
  527                         DPRINTF(("%s: M_PREPEND failed\n", __func__));
  528                         ipipstat.ipips_hdrops++;
  529                         *mp = NULL;
  530                         error = ENOBUFS;
  531                         goto bad;
  532                 }
  533 
  534                 /* Initialize IPv6 header */
  535                 ip6o = mtod(m, struct ip6_hdr *);
  536                 ip6o->ip6_flow = 0;
  537                 ip6o->ip6_vfc &= ~IPV6_VERSION_MASK;
  538                 ip6o->ip6_vfc |= IPV6_VERSION;
  539                 ip6o->ip6_plen = htons(m->m_pkthdr.len);
  540                 ip6o->ip6_hlim = ip_defttl;
  541                 ip6o->ip6_dst = saidx->dst.sin6.sin6_addr;
  542                 ip6o->ip6_src = saidx->src.sin6.sin6_addr;
  543 
  544 #ifdef INET
  545                 if (tp == IPVERSION) {
  546                         /* Save ECN notification */
  547                         m_copydata(m, sizeof(struct ip6_hdr) +
  548                             offsetof(struct ip, ip_tos), sizeof(u_int8_t),
  549                             (caddr_t) &itos);
  550 
  551                         /* This is really IPVERSION. */
  552                         ip6o->ip6_nxt = IPPROTO_IPIP;
  553                 } else
  554 #endif /* INET */
  555                         if (tp == (IPV6_VERSION >> 4)) {
  556                                 u_int32_t itos32;
  557 
  558                                 /* Save ECN notification. */
  559                                 m_copydata(m, sizeof(struct ip6_hdr) +
  560                                     offsetof(struct ip6_hdr, ip6_flow),
  561                                     sizeof(u_int32_t), (caddr_t) &itos32);
  562                                 itos = ntohl(itos32) >> 20;
  563 
  564                                 ip6o->ip6_nxt = IPPROTO_IPV6;
  565                         } else {
  566                                 goto nofamily;
  567                         }
  568 
  569                 otos = 0;
  570                 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
  571                 ip6o->ip6_flow |= htonl((u_int32_t) otos << 20);
  572                 break;
  573 #endif /* INET6 */
  574 
  575         default:
  576 nofamily:
  577                 DPRINTF(("%s: unsupported protocol family %u\n", __func__,
  578                     saidx->dst.sa.sa_family));
  579                 ipipstat.ipips_family++;
  580                 error = EAFNOSUPPORT;           /* XXX diffs from openbsd */
  581                 goto bad;
  582         }
  583 
  584         ipipstat.ipips_opackets++;
  585         *mp = m;
  586 
  587 #ifdef INET
  588         if (saidx->dst.sa.sa_family == AF_INET) {
  589 #if 0
  590                 if (sav->tdb_xform->xf_type == XF_IP4)
  591                         tdb->tdb_cur_bytes +=
  592                             m->m_pkthdr.len - sizeof(struct ip);
  593 #endif
  594                 ipipstat.ipips_obytes += m->m_pkthdr.len - sizeof(struct ip);
  595         }
  596 #endif /* INET */
  597 
  598 #ifdef INET6
  599         if (saidx->dst.sa.sa_family == AF_INET6) {
  600 #if 0
  601                 if (sav->tdb_xform->xf_type == XF_IP4)
  602                         tdb->tdb_cur_bytes +=
  603                             m->m_pkthdr.len - sizeof(struct ip6_hdr);
  604 #endif
  605                 ipipstat.ipips_obytes +=
  606                     m->m_pkthdr.len - sizeof(struct ip6_hdr);
  607         }
  608 #endif /* INET6 */
  609 
  610         return 0;
  611 bad:
  612         if (m)
  613                 m_freem(m), *mp = NULL;
  614         return (error);
  615 }
  616 
  617 #ifdef FAST_IPSEC
  618 static int
  619 ipe4_init(struct secasvar *sav, struct xformsw *xsp)
  620 {
  621         sav->tdb_xform = xsp;
  622         return 0;
  623 }
  624 
  625 static int
  626 ipe4_zeroize(struct secasvar *sav)
  627 {
  628         sav->tdb_xform = NULL;
  629         return 0;
  630 }
  631 
  632 static int
  633 ipe4_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  634 {
  635         /* This is a rather serious mistake, so no conditional printing. */
  636         printf("%s: should never be called\n", __func__);
  637         if (m)
  638                 m_freem(m);
  639         return EOPNOTSUPP;
  640 }
  641 
  642 static struct xformsw ipe4_xformsw = {
  643         XF_IP4,         0,              "IPv4 Simple Encapsulation",
  644         ipe4_init,      ipe4_zeroize,   ipe4_input,     ipip_output,
  645 };
  646 
  647 extern struct domain inetdomain;
  648 static struct ipprotosw ipe4_protosw[] = {
  649 { SOCK_RAW,     &inetdomain,    IPPROTO_IPV4,   PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  650   (pr_in_input_t*) ip4_input,
  651                 0,              0,              rip_ctloutput,
  652   0,
  653   0,            0,              0,              0,
  654   &rip_usrreqs
  655 },
  656 #ifdef INET6
  657 { SOCK_RAW,     &inetdomain,    IPPROTO_IPV6,   PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  658   (pr_in_input_t*) ip4_input,
  659                 0,              0,              rip_ctloutput,
  660   0,
  661   0,            0,              0,              0,
  662   &rip_usrreqs
  663 }
  664 #endif
  665 };
  666 
  667 /*
  668  * Check the encapsulated packet to see if we want it
  669  */
  670 static int
  671 ipe4_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
  672 {
  673         /*
  674          * Only take packets coming from IPSEC tunnels; the rest
  675          * must be handled by the gif tunnel code.  Note that we
  676          * also return a minimum priority when we want the packet
  677          * so any explicit gif tunnels take precedence.
  678          */
  679         return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0);
  680 }
  681 
  682 static void
  683 ipe4_attach(void)
  684 {
  685         xform_register(&ipe4_xformsw);
  686         /* attach to encapsulation framework */
  687         /* XXX save return cookie for detach on module remove */
  688         (void) encap_attach_func(AF_INET, -1,
  689                 ipe4_encapcheck, (struct protosw*) &ipe4_protosw[0], NULL);
  690 #ifdef INET6
  691         (void) encap_attach_func(AF_INET6, -1,
  692                 ipe4_encapcheck, (struct protosw*) &ipe4_protosw[1], NULL);
  693 #endif
  694 }
  695 SYSINIT(ipe4_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipe4_attach, NULL);
  696 #endif  /* FAST_IPSEC */

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