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: stable/4/sys/netipsec/xform_ipip.c 109792 2003-01-24 05:11:36Z 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 typedef void    pr_in_input_t (struct mbuf *, int, int); /* XXX FIX THIS */
   90 
   91 /*
   92  * We can control the acceptance of IP4 packets by altering the sysctl
   93  * net.inet.ipip.allow value.  Zero means drop them, all else is acceptance.
   94  */
   95 int     ipip_allow = 0;
   96 struct  ipipstat ipipstat;
   97 
   98 SYSCTL_DECL(_net_inet_ipip);
   99 SYSCTL_INT(_net_inet_ipip, OID_AUTO,
  100         ipip_allow,     CTLFLAG_RW,     &ipip_allow,    0, "");
  101 SYSCTL_STRUCT(_net_inet_ipip, IPSECCTL_STATS,
  102         stats,          CTLFLAG_RD,     &ipipstat,      ipipstat, "");
  103 
  104 /* XXX IPCOMP */
  105 #define M_IPSEC (M_AUTHIPHDR|M_AUTHIPDGM|M_DECRYPTED)
  106 
  107 static void _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp);
  108 
  109 #ifdef INET6
  110 /*
  111  * Really only a wrapper for ipip_input(), for use with IPv6.
  112  */
  113 int
  114 ip4_input6(struct mbuf **m, int *offp, int proto)
  115 {
  116 #if 0
  117         /* If we do not accept IP-in-IP explicitly, drop.  */
  118         if (!ipip_allow && ((*m)->m_flags & M_IPSEC) == 0) {
  119                 DPRINTF(("ip4_input6: dropped due to policy\n"));
  120                 ipipstat.ipips_pdrops++;
  121                 m_freem(*m);
  122                 return IPPROTO_DONE;
  123         }
  124 #endif
  125         _ipip_input(*m, *offp, NULL);
  126         return IPPROTO_DONE;
  127 }
  128 #endif /* INET6 */
  129 
  130 #ifdef INET
  131 /*
  132  * Really only a wrapper for ipip_input(), for use with IPv4.
  133  */
  134 void
  135 ip4_input(struct mbuf *m, ...)
  136 {
  137         va_list ap;
  138         int iphlen;
  139 
  140 #if 0
  141         /* If we do not accept IP-in-IP explicitly, drop.  */
  142         if (!ipip_allow && (m->m_flags & M_IPSEC) == 0) {
  143                 DPRINTF(("ip4_input: dropped due to policy\n"));
  144                 ipipstat.ipips_pdrops++;
  145                 m_freem(m);
  146                 return;
  147         }
  148 #endif
  149         va_start(ap, m);
  150         iphlen = va_arg(ap, int);
  151         va_end(ap);
  152 
  153         _ipip_input(m, iphlen, NULL);
  154 }
  155 #endif /* INET */
  156 
  157 /*
  158  * ipip_input gets called when we receive an IP{46} encapsulated packet,
  159  * either because we got it at a real interface, or because AH or ESP
  160  * were being used in tunnel mode (in which case the rcvif element will
  161  * contain the address of the encX interface associated with the tunnel.
  162  */
  163 
  164 static void
  165 _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp)
  166 {
  167         register struct sockaddr_in *sin;
  168         register struct ifnet *ifp;
  169         register struct ifaddr *ifa;
  170         struct ifqueue *ifq = NULL;
  171         struct ip *ipo;
  172 #ifdef INET6
  173         register struct sockaddr_in6 *sin6;
  174         struct ip6_hdr *ip6 = NULL;
  175         u_int8_t itos;
  176 #endif
  177         u_int8_t nxt;
  178         int isr;
  179         u_int8_t otos;
  180         u_int8_t v;
  181         int hlen;
  182 
  183         ipipstat.ipips_ipackets++;
  184 
  185         m_copydata(m, 0, 1, &v);
  186 
  187         switch (v >> 4) {
  188 #ifdef INET
  189         case 4:
  190                 hlen = sizeof(struct ip);
  191                 break;
  192 #endif /* INET */
  193 #ifdef INET6
  194         case 6:
  195                 hlen = sizeof(struct ip6_hdr);
  196                 break;
  197 #endif
  198         default:
  199                 DPRINTF(("_ipip_input: bad protocol version 0x%x (%u) "
  200                         "for outer header\n", v, v>>4));
  201                 ipipstat.ipips_family++;
  202                 m_freem(m);
  203                 return /* EAFNOSUPPORT */;
  204         }
  205 
  206         /* Bring the IP header in the first mbuf, if not there already */
  207         if (m->m_len < hlen) {
  208                 if ((m = m_pullup(m, hlen)) == NULL) {
  209                         DPRINTF(("ipip_input: m_pullup (1) failed\n"));
  210                         ipipstat.ipips_hdrops++;
  211                         return;
  212                 }
  213         }
  214 
  215         ipo = mtod(m, struct ip *);
  216 
  217 #ifdef MROUTING
  218         if (ipo->ip_v == IPVERSION && ipo->ip_p == IPPROTO_IPV4) {
  219                 if (IN_MULTICAST(((struct ip *)((char *) ipo + iphlen))->ip_dst.s_addr)) {
  220                         ipip_mroute_input (m, iphlen);
  221                         return;
  222                 }
  223         }
  224 #endif /* MROUTING */
  225 
  226         /* Keep outer ecn field. */
  227         switch (v >> 4) {
  228 #ifdef INET
  229         case 4:
  230                 otos = ipo->ip_tos;
  231                 break;
  232 #endif /* INET */
  233 #ifdef INET6
  234         case 6:
  235                 otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff;
  236                 break;
  237 #endif
  238         default:
  239                 panic("ipip_input: unknown ip version %u (outer)", v>>4);
  240         }
  241 
  242         /* Remove outer IP header */
  243         m_adj(m, iphlen);
  244 
  245         /* Sanity check */
  246         if (m->m_pkthdr.len < sizeof(struct ip))  {
  247                 ipipstat.ipips_hdrops++;
  248                 m_freem(m);
  249                 return;
  250         }
  251 
  252         m_copydata(m, 0, 1, &v);
  253 
  254         switch (v >> 4) {
  255 #ifdef INET
  256         case 4:
  257                 hlen = sizeof(struct ip);
  258                 break;
  259 #endif /* INET */
  260 
  261 #ifdef INET6
  262         case 6:
  263                 hlen = sizeof(struct ip6_hdr);
  264                 break;
  265 #endif
  266         default:
  267                 DPRINTF(("_ipip_input: bad protocol version 0x%x (%u) "
  268                         "for inner header\n", v, v>>4));
  269                 ipipstat.ipips_family++;
  270                 m_freem(m);
  271                 return; /* EAFNOSUPPORT */
  272         }
  273 
  274         /*
  275          * Bring the inner IP header in the first mbuf, if not there already.
  276          */
  277         if (m->m_len < hlen) {
  278                 if ((m = m_pullup(m, hlen)) == NULL) {
  279                         DPRINTF(("ipip_input: m_pullup (2) failed\n"));
  280                         ipipstat.ipips_hdrops++;
  281                         return;
  282                 }
  283         }
  284 
  285         /*
  286          * RFC 1853 specifies that the inner TTL should not be touched on
  287          * decapsulation. There's no reason this comment should be here, but
  288          * this is as good as any a position.
  289          */
  290 
  291         /* Some sanity checks in the inner IP header */
  292         switch (v >> 4) {
  293 #ifdef INET
  294         case 4:
  295                 ipo = mtod(m, struct ip *);
  296                 nxt = ipo->ip_p;
  297                 ip_ecn_egress(ip4_ipsec_ecn, &otos, &ipo->ip_tos);
  298                 break;
  299 #endif /* INET */
  300 #ifdef INET6
  301         case 6:
  302                 ip6 = (struct ip6_hdr *) ipo;
  303                 nxt = ip6->ip6_nxt;
  304                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  305                 ip_ecn_egress(ip6_ipsec_ecn, &otos, &itos);
  306                 ip6->ip6_flow &= ~htonl(0xff << 20);
  307                 ip6->ip6_flow |= htonl((u_int32_t) itos << 20);
  308                 break;
  309 #endif
  310         default:
  311                 panic("ipip_input: unknown ip version %u (inner)", v>>4);
  312         }
  313 
  314         /* Check for local address spoofing. */
  315         if ((m->m_pkthdr.rcvif == NULL ||
  316             !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) &&
  317             ipip_allow != 2) {
  318                 for (ifp = ifnet.tqh_first; ifp != 0;
  319                      ifp = ifp->if_list.tqe_next) {
  320                         for (ifa = ifp->if_addrlist.tqh_first; ifa != 0;
  321                              ifa = ifa->ifa_list.tqe_next) {
  322 #ifdef INET
  323                                 if (ipo) {
  324                                         if (ifa->ifa_addr->sa_family !=
  325                                             AF_INET)
  326                                                 continue;
  327 
  328                                         sin = (struct sockaddr_in *) ifa->ifa_addr;
  329 
  330                                         if (sin->sin_addr.s_addr ==
  331                                             ipo->ip_src.s_addr) {
  332                                                 ipipstat.ipips_spoof++;
  333                                                 m_freem(m);
  334                                                 return;
  335                                         }
  336                                 }
  337 #endif /* INET */
  338 
  339 #ifdef INET6
  340                                 if (ip6) {
  341                                         if (ifa->ifa_addr->sa_family !=
  342                                             AF_INET6)
  343                                                 continue;
  344 
  345                                         sin6 = (struct sockaddr_in6 *) ifa->ifa_addr;
  346 
  347                                         if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_src)) {
  348                                                 ipipstat.ipips_spoof++;
  349                                                 m_freem(m);
  350                                                 return;
  351                                         }
  352 
  353                                 }
  354 #endif /* INET6 */
  355                         }
  356                 }
  357         }
  358 
  359         /* Statistics */
  360         ipipstat.ipips_ibytes += m->m_pkthdr.len - iphlen;
  361 
  362         /*
  363          * Interface pointer stays the same; if no IPsec processing has
  364          * been done (or will be done), this will point to a normal
  365          * interface. Otherwise, it'll point to an enc interface, which
  366          * will allow a packet filter to distinguish between secure and
  367          * untrusted packets.
  368          */
  369 
  370         switch (v >> 4) {
  371 #ifdef INET
  372         case 4:
  373                 ifq = &ipintrq;
  374                 isr = NETISR_IP;
  375                 break;
  376 #endif
  377 #ifdef INET6
  378         case 6:
  379                 ifq = &ip6intrq;
  380                 isr = NETISR_IPV6;
  381                 break;
  382 #endif
  383         default:
  384                 panic("ipip_input: should never reach here");
  385         }
  386 
  387         if (!IF_HANDOFF(ifq, m, NULL)) {
  388                 ipipstat.ipips_qfull++;
  389 
  390                 DPRINTF(("ipip_input: packet dropped because of full queue\n"));
  391         } else {
  392                 schednetisr(isr);
  393         }
  394 }
  395 
  396 int
  397 ipip_output(
  398         struct mbuf *m,
  399         struct ipsecrequest *isr,
  400         struct mbuf **mp,
  401         int skip,
  402         int protoff
  403 )
  404 {
  405         struct secasvar *sav;
  406         u_int8_t tp, otos;
  407         struct secasindex *saidx;
  408         int error;
  409 #ifdef INET
  410         u_int8_t itos;
  411         struct ip *ipo;
  412 #endif /* INET */
  413 #ifdef INET6
  414         struct ip6_hdr *ip6, *ip6o;
  415 #endif /* INET6 */
  416 
  417         SPLASSERT(net, "ipip_output");
  418 
  419         sav = isr->sav;
  420         KASSERT(sav != NULL, ("ipip_output: null SA"));
  421         KASSERT(sav->sah != NULL, ("ipip_output: null SAH"));
  422 
  423         /* XXX Deal with empty TDB source/destination addresses. */
  424 
  425         m_copydata(m, 0, 1, &tp);
  426         tp = (tp >> 4) & 0xff;  /* Get the IP version number. */
  427 
  428         saidx = &sav->sah->saidx;
  429         switch (saidx->dst.sa.sa_family) {
  430 #ifdef INET
  431         case AF_INET:
  432                 if (saidx->src.sa.sa_family != AF_INET ||
  433                     saidx->src.sin.sin_addr.s_addr == INADDR_ANY ||
  434                     saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) {
  435                         DPRINTF(("ipip_output: unspecified tunnel endpoint "
  436                             "address in SA %s/%08lx\n",
  437                             ipsec_address(&saidx->dst),
  438                             (u_long) ntohl(sav->spi)));
  439                         ipipstat.ipips_unspec++;
  440                         error = EINVAL;
  441                         goto bad;
  442                 }
  443 
  444                 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
  445                 if (m == 0) {
  446                         DPRINTF(("ipip_output: M_PREPEND failed\n"));
  447                         ipipstat.ipips_hdrops++;
  448                         error = ENOBUFS;
  449                         goto bad;
  450                 }
  451 
  452                 ipo = mtod(m, struct ip *);
  453 
  454                 ipo->ip_v = IPVERSION;
  455                 ipo->ip_hl = 5;
  456                 ipo->ip_len = htons(m->m_pkthdr.len);
  457                 ipo->ip_ttl = ip_defttl;
  458                 ipo->ip_sum = 0;
  459                 ipo->ip_src = saidx->src.sin.sin_addr;
  460                 ipo->ip_dst = saidx->dst.sin.sin_addr;
  461 
  462 #ifdef RANDOM_IP_ID
  463                 ipo->ip_id = ip_randomid();
  464 #else
  465                 ipo->ip_id = htons(ip_id++);
  466 #endif
  467 
  468                 /* If the inner protocol is IP... */
  469                 if (tp == IPVERSION) {
  470                         /* Save ECN notification */
  471                         m_copydata(m, sizeof(struct ip) +
  472                             offsetof(struct ip, ip_tos),
  473                             sizeof(u_int8_t), (caddr_t) &itos);
  474 
  475                         ipo->ip_p = IPPROTO_IPIP;
  476 
  477                         /*
  478                          * We should be keeping tunnel soft-state and
  479                          * send back ICMPs if needed.
  480                          */
  481                         m_copydata(m, sizeof(struct ip) +
  482                             offsetof(struct ip, ip_off),
  483                             sizeof(u_int16_t), (caddr_t) &ipo->ip_off);
  484                         ipo->ip_off = ntohs(ipo->ip_off);
  485                         ipo->ip_off &= ~(IP_DF | IP_MF | IP_OFFMASK);
  486                         ipo->ip_off = htons(ipo->ip_off);
  487                 }
  488 #ifdef INET6
  489                 else if (tp == (IPV6_VERSION >> 4)) {
  490                         u_int32_t itos32;
  491 
  492                         /* Save ECN notification. */
  493                         m_copydata(m, sizeof(struct ip) +
  494                             offsetof(struct ip6_hdr, ip6_flow),
  495                             sizeof(u_int32_t), (caddr_t) &itos32);
  496                         itos = ntohl(itos32) >> 20;
  497                         ipo->ip_p = IPPROTO_IPV6;
  498                         ipo->ip_off = 0;
  499                 }
  500 #endif /* INET6 */
  501                 else {
  502                         goto nofamily;
  503                 }
  504 
  505                 otos = 0;
  506                 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
  507                 ipo->ip_tos = otos;
  508                 break;
  509 #endif /* INET */
  510 
  511 #ifdef INET6
  512         case AF_INET6:
  513                 if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) ||
  514                     saidx->src.sa.sa_family != AF_INET6 ||
  515                     IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) {
  516                         DPRINTF(("ipip_output: unspecified tunnel endpoint "
  517                             "address in SA %s/%08lx\n",
  518                             ipsec_address(&saidx->dst),
  519                             (u_long) ntohl(sav->spi)));
  520                         ipipstat.ipips_unspec++;
  521                         error = ENOBUFS;
  522                         goto bad;
  523                 }
  524 
  525                 /* scoped address handling */
  526                 ip6 = mtod(m, struct ip6_hdr *);
  527                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
  528                         ip6->ip6_src.s6_addr16[1] = 0;
  529                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
  530                         ip6->ip6_dst.s6_addr16[1] = 0;
  531 
  532                 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
  533                 if (m == 0) {
  534                         DPRINTF(("ipip_output: M_PREPEND failed\n"));
  535                         ipipstat.ipips_hdrops++;
  536                         *mp = NULL;
  537                         error = ENOBUFS;
  538                         goto bad;
  539                 }
  540 
  541                 /* Initialize IPv6 header */
  542                 ip6o = mtod(m, struct ip6_hdr *);
  543                 ip6o->ip6_flow = 0;
  544                 ip6o->ip6_vfc &= ~IPV6_VERSION_MASK;
  545                 ip6o->ip6_vfc |= IPV6_VERSION;
  546                 ip6o->ip6_plen = htons(m->m_pkthdr.len);
  547                 ip6o->ip6_hlim = ip_defttl;
  548                 ip6o->ip6_dst = saidx->dst.sin6.sin6_addr;
  549                 ip6o->ip6_src = saidx->src.sin6.sin6_addr;
  550 
  551 #ifdef INET
  552                 if (tp == IPVERSION) {
  553                         /* Save ECN notification */
  554                         m_copydata(m, sizeof(struct ip6_hdr) +
  555                             offsetof(struct ip, ip_tos), sizeof(u_int8_t),
  556                             (caddr_t) &itos);
  557 
  558                         /* This is really IPVERSION. */
  559                         ip6o->ip6_nxt = IPPROTO_IPIP;
  560                 } else
  561 #endif /* INET */
  562                         if (tp == (IPV6_VERSION >> 4)) {
  563                                 u_int32_t itos32;
  564 
  565                                 /* Save ECN notification. */
  566                                 m_copydata(m, sizeof(struct ip6_hdr) +
  567                                     offsetof(struct ip6_hdr, ip6_flow),
  568                                     sizeof(u_int32_t), (caddr_t) &itos32);
  569                                 itos = ntohl(itos32) >> 20;
  570 
  571                                 ip6o->ip6_nxt = IPPROTO_IPV6;
  572                         } else {
  573                                 goto nofamily;
  574                         }
  575 
  576                 otos = 0;
  577                 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
  578                 ip6o->ip6_flow |= htonl((u_int32_t) otos << 20);
  579                 break;
  580 #endif /* INET6 */
  581 
  582         default:
  583 nofamily:
  584                 DPRINTF(("ipip_output: unsupported protocol family %u\n",
  585                     saidx->dst.sa.sa_family));
  586                 ipipstat.ipips_family++;
  587                 error = EAFNOSUPPORT;           /* XXX diffs from openbsd */
  588                 goto bad;
  589         }
  590 
  591         ipipstat.ipips_opackets++;
  592         *mp = m;
  593 
  594 #ifdef INET
  595         if (saidx->dst.sa.sa_family == AF_INET) {
  596 #if 0
  597                 if (sav->tdb_xform->xf_type == XF_IP4)
  598                         tdb->tdb_cur_bytes +=
  599                             m->m_pkthdr.len - sizeof(struct ip);
  600 #endif
  601                 ipipstat.ipips_obytes += m->m_pkthdr.len - sizeof(struct ip);
  602         }
  603 #endif /* INET */
  604 
  605 #ifdef INET6
  606         if (saidx->dst.sa.sa_family == AF_INET6) {
  607 #if 0
  608                 if (sav->tdb_xform->xf_type == XF_IP4)
  609                         tdb->tdb_cur_bytes +=
  610                             m->m_pkthdr.len - sizeof(struct ip6_hdr);
  611 #endif
  612                 ipipstat.ipips_obytes +=
  613                     m->m_pkthdr.len - sizeof(struct ip6_hdr);
  614         }
  615 #endif /* INET6 */
  616 
  617         return 0;
  618 bad:
  619         if (m)
  620                 m_freem(m), *mp = NULL;
  621         return (error);
  622 }
  623 
  624 #ifdef FAST_IPSEC
  625 static int
  626 ipe4_init(struct secasvar *sav, struct xformsw *xsp)
  627 {
  628         sav->tdb_xform = xsp;
  629         return 0;
  630 }
  631 
  632 static int
  633 ipe4_zeroize(struct secasvar *sav)
  634 {
  635         sav->tdb_xform = NULL;
  636         return 0;
  637 }
  638 
  639 static int
  640 ipe4_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  641 {
  642         /* This is a rather serious mistake, so no conditional printing. */
  643         printf("ipe4_input: should never be called\n");
  644         if (m)
  645                 m_freem(m);
  646         return EOPNOTSUPP;
  647 }
  648 
  649 static struct xformsw ipe4_xformsw = {
  650         XF_IP4,         0,              "IPv4 Simple Encapsulation",
  651         ipe4_init,      ipe4_zeroize,   ipe4_input,     ipip_output,
  652 };
  653 
  654 extern struct domain inetdomain;
  655 static struct ipprotosw ipe4_protosw[] = {
  656 { SOCK_RAW,     &inetdomain,    IPPROTO_IPV4,   PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  657   (pr_in_input_t*) ip4_input,
  658                 0,              0,              rip_ctloutput,
  659   0,
  660   0,            0,              0,              0,
  661   &rip_usrreqs
  662 },
  663 #ifdef INET6
  664 { SOCK_RAW,     &inetdomain,    IPPROTO_IPV6,   PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  665   (pr_in_input_t*) ip4_input,
  666                 0,              0,              rip_ctloutput,
  667   0,
  668   0,            0,              0,              0,
  669   &rip_usrreqs
  670 }
  671 #endif
  672 };
  673 
  674 /*
  675  * Check the encapsulated packet to see if we want it
  676  */
  677 static int
  678 ipe4_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
  679 {
  680         /*
  681          * Only take packets coming from IPSEC tunnels; the rest
  682          * must be handled by the gif tunnel code.  Note that we
  683          * also return a minimum priority when we want the packet
  684          * so any explicit gif tunnels take precedence.
  685          */
  686         return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0);
  687 }
  688 
  689 static void
  690 ipe4_attach(void)
  691 {
  692         xform_register(&ipe4_xformsw);
  693         /* attach to encapsulation framework */
  694         /* XXX save return cookie for detach on module remove */
  695         (void) encap_attach_func(AF_INET, -1,
  696                 ipe4_encapcheck, (struct protosw*) &ipe4_protosw[0], NULL);
  697 #ifdef INET6
  698         (void) encap_attach_func(AF_INET6, -1,
  699                 ipe4_encapcheck, (struct protosw*) &ipe4_protosw[1], NULL);
  700 #endif
  701 }
  702 SYSINIT(ipe4_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipe4_attach, NULL);
  703 #endif  /* FAST_IPSEC */

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