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/9/sys/netipsec/xform_ipip.c 264815 2014-04-23 12:05:53Z ae $   */
    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/pfil.h>
   56 #include <net/route.h>
   57 #include <net/netisr.h>
   58 #include <net/vnet.h>
   59 
   60 #include <netinet/in.h>
   61 #include <netinet/in_systm.h>
   62 #include <netinet/in_var.h>
   63 #include <netinet/ip.h>
   64 #include <netinet/ip_ecn.h>
   65 #include <netinet/ip_var.h>
   66 #include <netinet/ip_encap.h>
   67 
   68 #include <netipsec/ipsec.h>
   69 #include <netipsec/xform.h>
   70 
   71 #include <netipsec/ipip_var.h>
   72 
   73 #ifdef INET6
   74 #include <netinet/ip6.h>
   75 #include <netipsec/ipsec6.h>
   76 #include <netinet6/ip6_ecn.h>
   77 #include <netinet6/in6_var.h>
   78 #include <netinet6/ip6protosw.h>
   79 #endif
   80 
   81 #include <netipsec/key.h>
   82 #include <netipsec/key_debug.h>
   83 
   84 #include <machine/stdarg.h>
   85 
   86 /*
   87  * We can control the acceptance of IP4 packets by altering the sysctl
   88  * net.inet.ipip.allow value.  Zero means drop them, all else is acceptance.
   89  */
   90 VNET_DEFINE(int, ipip_allow) = 0;
   91 VNET_DEFINE(struct ipipstat, ipipstat);
   92 
   93 SYSCTL_DECL(_net_inet_ipip);
   94 SYSCTL_VNET_INT(_net_inet_ipip, OID_AUTO,
   95         ipip_allow,     CTLFLAG_RW,     &VNET_NAME(ipip_allow), 0, "");
   96 SYSCTL_VNET_STRUCT(_net_inet_ipip, IPSECCTL_STATS,
   97         stats,          CTLFLAG_RD,     &VNET_NAME(ipipstat),   ipipstat, "");
   98 
   99 /* XXX IPCOMP */
  100 #define M_IPSEC (M_AUTHIPHDR|M_AUTHIPDGM|M_DECRYPTED)
  101 
  102 static void _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp);
  103 
  104 #ifdef INET6
  105 /*
  106  * Really only a wrapper for ipip_input(), for use with IPv6.
  107  */
  108 int
  109 ip4_input6(struct mbuf **m, int *offp, int proto)
  110 {
  111 #if 0
  112         /* If we do not accept IP-in-IP explicitly, drop.  */
  113         if (!V_ipip_allow && ((*m)->m_flags & M_IPSEC) == 0) {
  114                 DPRINTF(("%s: dropped due to policy\n", __func__));
  115                 IPIPSTAT_INC(ipips_pdrops);
  116                 m_freem(*m);
  117                 return IPPROTO_DONE;
  118         }
  119 #endif
  120         _ipip_input(*m, *offp, NULL);
  121         return IPPROTO_DONE;
  122 }
  123 #endif /* INET6 */
  124 
  125 #ifdef INET
  126 /*
  127  * Really only a wrapper for ipip_input(), for use with IPv4.
  128  */
  129 void
  130 ip4_input(struct mbuf *m, int off)
  131 {
  132 #if 0
  133         /* If we do not accept IP-in-IP explicitly, drop.  */
  134         if (!V_ipip_allow && (m->m_flags & M_IPSEC) == 0) {
  135                 DPRINTF(("%s: dropped due to policy\n", __func__));
  136                 IPIPSTAT_INC(ipips_pdrops);
  137                 m_freem(m);
  138                 return;
  139         }
  140 #endif
  141         _ipip_input(m, off, NULL);
  142 }
  143 #endif /* INET */
  144 
  145 /*
  146  * ipip_input gets called when we receive an IP{46} encapsulated packet,
  147  * either because we got it at a real interface, or because AH or ESP
  148  * were being used in tunnel mode (in which case the rcvif element will
  149  * contain the address of the encX interface associated with the tunnel.
  150  */
  151 
  152 static void
  153 _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp)
  154 {
  155         struct ip *ipo;
  156 #ifdef INET6
  157         struct ip6_hdr *ip6 = NULL;
  158         u_int8_t itos;
  159 #endif
  160         int isr;
  161         u_int8_t otos;
  162         u_int8_t v;
  163         int hlen;
  164 
  165         IPIPSTAT_INC(ipips_ipackets);
  166 
  167         m_copydata(m, 0, 1, &v);
  168 
  169         switch (v >> 4) {
  170 #ifdef INET
  171         case 4:
  172                 hlen = sizeof(struct ip);
  173                 break;
  174 #endif /* INET */
  175 #ifdef INET6
  176         case 6:
  177                 hlen = sizeof(struct ip6_hdr);
  178                 break;
  179 #endif
  180         default:
  181                 IPIPSTAT_INC(ipips_family);
  182                 m_freem(m);
  183                 return /* EAFNOSUPPORT */;
  184         }
  185 
  186         /* Bring the IP header in the first mbuf, if not there already */
  187         if (m->m_len < hlen) {
  188                 if ((m = m_pullup(m, hlen)) == NULL) {
  189                         DPRINTF(("%s: m_pullup (1) failed\n", __func__));
  190                         IPIPSTAT_INC(ipips_hdrops);
  191                         return;
  192                 }
  193         }
  194         ipo = mtod(m, struct ip *);
  195 
  196         /* Keep outer ecn field. */
  197         switch (v >> 4) {
  198 #ifdef INET
  199         case 4:
  200                 otos = ipo->ip_tos;
  201                 break;
  202 #endif /* INET */
  203 #ifdef INET6
  204         case 6:
  205                 otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff;
  206                 break;
  207 #endif
  208         default:
  209                 panic("ipip_input: unknown ip version %u (outer)", v>>4);
  210         }
  211 
  212         /* Remove outer IP header */
  213         m_adj(m, iphlen);
  214 
  215         /* Sanity check */
  216         if (m->m_pkthdr.len < sizeof(struct ip))  {
  217                 IPIPSTAT_INC(ipips_hdrops);
  218                 m_freem(m);
  219                 return;
  220         }
  221 
  222         m_copydata(m, 0, 1, &v);
  223 
  224         switch (v >> 4) {
  225 #ifdef INET
  226         case 4:
  227                 hlen = sizeof(struct ip);
  228                 break;
  229 #endif /* INET */
  230 
  231 #ifdef INET6
  232         case 6:
  233                 hlen = sizeof(struct ip6_hdr);
  234                 break;
  235 #endif
  236         default:
  237                 IPIPSTAT_INC(ipips_family);
  238                 m_freem(m);
  239                 return; /* EAFNOSUPPORT */
  240         }
  241 
  242         /*
  243          * Bring the inner IP header in the first mbuf, if not there already.
  244          */
  245         if (m->m_len < hlen) {
  246                 if ((m = m_pullup(m, hlen)) == NULL) {
  247                         DPRINTF(("%s: m_pullup (2) failed\n", __func__));
  248                         IPIPSTAT_INC(ipips_hdrops);
  249                         return;
  250                 }
  251         }
  252 
  253         /*
  254          * RFC 1853 specifies that the inner TTL should not be touched on
  255          * decapsulation. There's no reason this comment should be here, but
  256          * this is as good as any a position.
  257          */
  258 
  259         /* Some sanity checks in the inner IP header */
  260         switch (v >> 4) {
  261 #ifdef INET
  262         case 4:
  263                 ipo = mtod(m, struct ip *);
  264                 ip_ecn_egress(V_ip4_ipsec_ecn, &otos, &ipo->ip_tos);
  265                 break;
  266 #endif /* INET */
  267 #ifdef INET6
  268         case 6:
  269                 ip6 = (struct ip6_hdr *) ipo;
  270                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  271                 ip_ecn_egress(V_ip6_ipsec_ecn, &otos, &itos);
  272                 ip6->ip6_flow &= ~htonl(0xff << 20);
  273                 ip6->ip6_flow |= htonl((u_int32_t) itos << 20);
  274                 break;
  275 #endif
  276         default:
  277                 panic("ipip_input: unknown ip version %u (inner)", v>>4);
  278         }
  279 
  280         /* Check for local address spoofing. */
  281         if ((m->m_pkthdr.rcvif == NULL ||
  282             !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) &&
  283             V_ipip_allow != 2) {
  284 #ifdef INET
  285                 if ((v >> 4) == IPVERSION &&
  286                     in_localip(ipo->ip_src) != 0) {
  287                         IPIPSTAT_INC(ipips_spoof);
  288                         m_freem(m);
  289                         return;
  290                 }
  291 #endif
  292 #ifdef INET6
  293                 if ((v & IPV6_VERSION_MASK) == IPV6_VERSION &&
  294                     in6_localip(&ip6->ip6_src) != 0) {
  295                         IPIPSTAT_INC(ipips_spoof);
  296                         m_freem(m);
  297                         return;
  298                 }
  299 #endif
  300         }
  301 
  302         /* Statistics */
  303         IPIPSTAT_ADD(ipips_ibytes, m->m_pkthdr.len - iphlen);
  304 
  305 #ifdef DEV_ENC
  306         switch (v >> 4) {
  307 #ifdef INET
  308         case 4:
  309                 ipsec_bpf(m, NULL, AF_INET, ENC_IN|ENC_AFTER);
  310                 break;
  311 #endif
  312 #ifdef INET6
  313         case 6:
  314                 ipsec_bpf(m, NULL, AF_INET6, ENC_IN|ENC_AFTER);
  315                 break;
  316 #endif
  317         default:
  318                 panic("%s: bogus ip version %u", __func__, v>>4);
  319         }
  320         /* pass the mbuf to enc0 for packet filtering */
  321         if (ipsec_filter(&m, PFIL_IN, ENC_IN|ENC_AFTER) != 0)
  322                 return;
  323 #endif
  324 
  325         /*
  326          * Interface pointer stays the same; if no IPsec processing has
  327          * been done (or will be done), this will point to a normal
  328          * interface. Otherwise, it'll point to an enc interface, which
  329          * will allow a packet filter to distinguish between secure and
  330          * untrusted packets.
  331          */
  332 
  333         switch (v >> 4) {
  334 #ifdef INET
  335         case 4:
  336                 isr = NETISR_IP;
  337                 break;
  338 #endif
  339 #ifdef INET6
  340         case 6:
  341                 isr = NETISR_IPV6;
  342                 break;
  343 #endif
  344         default:
  345                 panic("%s: bogus ip version %u", __func__, v>>4);
  346         }
  347 
  348         m_addr_changed(m);
  349 
  350         if (netisr_queue(isr, m)) {     /* (0) on success. */
  351                 IPIPSTAT_INC(ipips_qfull);
  352                 DPRINTF(("%s: packet dropped because of full queue\n",
  353                         __func__));
  354         }
  355 }
  356 
  357 int
  358 ipip_output(
  359         struct mbuf *m,
  360         struct ipsecrequest *isr,
  361         struct mbuf **mp,
  362         int skip,
  363         int protoff
  364 )
  365 {
  366         struct secasvar *sav;
  367         u_int8_t tp, otos;
  368         struct secasindex *saidx;
  369         int error;
  370 #if defined(INET) || defined(INET6)
  371         u_int8_t itos;
  372 #endif
  373 #ifdef INET
  374         struct ip *ipo;
  375 #endif /* INET */
  376 #ifdef INET6
  377         struct ip6_hdr *ip6, *ip6o;
  378 #endif /* INET6 */
  379 
  380         sav = isr->sav;
  381         IPSEC_ASSERT(sav != NULL, ("null SA"));
  382         IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
  383 
  384         /* XXX Deal with empty TDB source/destination addresses. */
  385 
  386         m_copydata(m, 0, 1, &tp);
  387         tp = (tp >> 4) & 0xff;  /* Get the IP version number. */
  388 
  389         saidx = &sav->sah->saidx;
  390         switch (saidx->dst.sa.sa_family) {
  391 #ifdef INET
  392         case AF_INET:
  393                 if (saidx->src.sa.sa_family != AF_INET ||
  394                     saidx->src.sin.sin_addr.s_addr == INADDR_ANY ||
  395                     saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) {
  396                         DPRINTF(("%s: unspecified tunnel endpoint "
  397                             "address in SA %s/%08lx\n", __func__,
  398                             ipsec_address(&saidx->dst),
  399                             (u_long) ntohl(sav->spi)));
  400                         IPIPSTAT_INC(ipips_unspec);
  401                         error = EINVAL;
  402                         goto bad;
  403                 }
  404 
  405                 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
  406                 if (m == 0) {
  407                         DPRINTF(("%s: M_PREPEND failed\n", __func__));
  408                         IPIPSTAT_INC(ipips_hdrops);
  409                         error = ENOBUFS;
  410                         goto bad;
  411                 }
  412 
  413                 ipo = mtod(m, struct ip *);
  414 
  415                 ipo->ip_v = IPVERSION;
  416                 ipo->ip_hl = 5;
  417                 ipo->ip_len = htons(m->m_pkthdr.len);
  418                 ipo->ip_ttl = V_ip_defttl;
  419                 ipo->ip_sum = 0;
  420                 ipo->ip_src = saidx->src.sin.sin_addr;
  421                 ipo->ip_dst = saidx->dst.sin.sin_addr;
  422 
  423                 ipo->ip_id = ip_newid();
  424 
  425                 /* If the inner protocol is IP... */
  426                 switch (tp) {
  427                 case IPVERSION:
  428                         /* Save ECN notification */
  429                         m_copydata(m, sizeof(struct ip) +
  430                             offsetof(struct ip, ip_tos),
  431                             sizeof(u_int8_t), (caddr_t) &itos);
  432 
  433                         ipo->ip_p = IPPROTO_IPIP;
  434 
  435                         /*
  436                          * We should be keeping tunnel soft-state and
  437                          * send back ICMPs if needed.
  438                          */
  439                         m_copydata(m, sizeof(struct ip) +
  440                             offsetof(struct ip, ip_off),
  441                             sizeof(u_int16_t), (caddr_t) &ipo->ip_off);
  442                         ipo->ip_off = ntohs(ipo->ip_off);
  443                         ipo->ip_off &= ~(IP_DF | IP_MF | IP_OFFMASK);
  444                         ipo->ip_off = htons(ipo->ip_off);
  445                         break;
  446 #ifdef INET6
  447                 case (IPV6_VERSION >> 4):
  448                 {
  449                         u_int32_t itos32;
  450 
  451                         /* Save ECN notification. */
  452                         m_copydata(m, sizeof(struct ip) +
  453                             offsetof(struct ip6_hdr, ip6_flow),
  454                             sizeof(u_int32_t), (caddr_t) &itos32);
  455                         itos = ntohl(itos32) >> 20;
  456                         ipo->ip_p = IPPROTO_IPV6;
  457                         ipo->ip_off = 0;
  458                         break;
  459                 }
  460 #endif /* INET6 */
  461                 default:
  462                         goto nofamily;
  463                 }
  464 
  465                 otos = 0;
  466                 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
  467                 ipo->ip_tos = otos;
  468                 break;
  469 #endif /* INET */
  470 
  471 #ifdef INET6
  472         case AF_INET6:
  473                 if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) ||
  474                     saidx->src.sa.sa_family != AF_INET6 ||
  475                     IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) {
  476                         DPRINTF(("%s: unspecified tunnel endpoint "
  477                             "address in SA %s/%08lx\n", __func__,
  478                             ipsec_address(&saidx->dst),
  479                             (u_long) ntohl(sav->spi)));
  480                         IPIPSTAT_INC(ipips_unspec);
  481                         error = ENOBUFS;
  482                         goto bad;
  483                 }
  484 
  485                 /* scoped address handling */
  486                 ip6 = mtod(m, struct ip6_hdr *);
  487                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
  488                         ip6->ip6_src.s6_addr16[1] = 0;
  489                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
  490                         ip6->ip6_dst.s6_addr16[1] = 0;
  491 
  492                 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
  493                 if (m == 0) {
  494                         DPRINTF(("%s: M_PREPEND failed\n", __func__));
  495                         IPIPSTAT_INC(ipips_hdrops);
  496                         error = ENOBUFS;
  497                         goto bad;
  498                 }
  499 
  500                 /* Initialize IPv6 header */
  501                 ip6o = mtod(m, struct ip6_hdr *);
  502                 ip6o->ip6_flow = 0;
  503                 ip6o->ip6_vfc &= ~IPV6_VERSION_MASK;
  504                 ip6o->ip6_vfc |= IPV6_VERSION;
  505                 ip6o->ip6_plen = htons(m->m_pkthdr.len);
  506                 ip6o->ip6_hlim = V_ip_defttl;
  507                 ip6o->ip6_dst = saidx->dst.sin6.sin6_addr;
  508                 ip6o->ip6_src = saidx->src.sin6.sin6_addr;
  509 
  510                 switch (tp) {
  511 #ifdef INET
  512                 case IPVERSION:
  513                         /* Save ECN notification */
  514                         m_copydata(m, sizeof(struct ip6_hdr) +
  515                             offsetof(struct ip, ip_tos), sizeof(u_int8_t),
  516                             (caddr_t) &itos);
  517 
  518                         /* This is really IPVERSION. */
  519                         ip6o->ip6_nxt = IPPROTO_IPIP;
  520                         break;
  521 #endif /* INET */
  522                 case (IPV6_VERSION >> 4):
  523                 {
  524                         u_int32_t itos32;
  525 
  526                         /* Save ECN notification. */
  527                         m_copydata(m, sizeof(struct ip6_hdr) +
  528                             offsetof(struct ip6_hdr, ip6_flow),
  529                             sizeof(u_int32_t), (caddr_t) &itos32);
  530                         itos = ntohl(itos32) >> 20;
  531 
  532                         ip6o->ip6_nxt = IPPROTO_IPV6;
  533                         break;
  534                 }
  535                 default:
  536                         goto nofamily;
  537                 }
  538 
  539                 otos = 0;
  540                 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
  541                 ip6o->ip6_flow |= htonl((u_int32_t) otos << 20);
  542                 break;
  543 #endif /* INET6 */
  544 
  545         default:
  546 nofamily:
  547                 DPRINTF(("%s: unsupported protocol family %u\n", __func__,
  548                     saidx->dst.sa.sa_family));
  549                 IPIPSTAT_INC(ipips_family);
  550                 error = EAFNOSUPPORT;           /* XXX diffs from openbsd */
  551                 goto bad;
  552         }
  553 
  554         IPIPSTAT_INC(ipips_opackets);
  555         *mp = m;
  556 
  557 #ifdef INET
  558         if (saidx->dst.sa.sa_family == AF_INET) {
  559 #if 0
  560                 if (sav->tdb_xform->xf_type == XF_IP4)
  561                         tdb->tdb_cur_bytes +=
  562                             m->m_pkthdr.len - sizeof(struct ip);
  563 #endif
  564                 IPIPSTAT_ADD(ipips_obytes,
  565                     m->m_pkthdr.len - sizeof(struct ip));
  566         }
  567 #endif /* INET */
  568 
  569 #ifdef INET6
  570         if (saidx->dst.sa.sa_family == AF_INET6) {
  571 #if 0
  572                 if (sav->tdb_xform->xf_type == XF_IP4)
  573                         tdb->tdb_cur_bytes +=
  574                             m->m_pkthdr.len - sizeof(struct ip6_hdr);
  575 #endif
  576                 IPIPSTAT_ADD(ipips_obytes,
  577                     m->m_pkthdr.len - sizeof(struct ip6_hdr));
  578         }
  579 #endif /* INET6 */
  580 
  581         return 0;
  582 bad:
  583         if (m)
  584                 m_freem(m);
  585         *mp = NULL;
  586         return (error);
  587 }
  588 
  589 #ifdef IPSEC
  590 #if defined(INET) || defined(INET6)
  591 static int
  592 ipe4_init(struct secasvar *sav, struct xformsw *xsp)
  593 {
  594         sav->tdb_xform = xsp;
  595         return 0;
  596 }
  597 
  598 static int
  599 ipe4_zeroize(struct secasvar *sav)
  600 {
  601         sav->tdb_xform = NULL;
  602         return 0;
  603 }
  604 
  605 static int
  606 ipe4_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  607 {
  608         /* This is a rather serious mistake, so no conditional printing. */
  609         printf("%s: should never be called\n", __func__);
  610         if (m)
  611                 m_freem(m);
  612         return EOPNOTSUPP;
  613 }
  614 
  615 static struct xformsw ipe4_xformsw = {
  616         XF_IP4,         0,              "IPv4 Simple Encapsulation",
  617         ipe4_init,      ipe4_zeroize,   ipe4_input,     ipip_output,
  618 };
  619 
  620 extern struct domain inetdomain;
  621 #endif /* INET || INET6 */
  622 #ifdef INET
  623 static struct protosw ipe4_protosw = {
  624         .pr_type =      SOCK_RAW,
  625         .pr_domain =    &inetdomain,
  626         .pr_protocol =  IPPROTO_IPV4,
  627         .pr_flags =     PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  628         .pr_input =     ip4_input,
  629         .pr_ctloutput = rip_ctloutput,
  630         .pr_usrreqs =   &rip_usrreqs
  631 };
  632 #endif /* INET */
  633 #if defined(INET6) && defined(INET)
  634 static struct ip6protosw ipe6_protosw = {
  635         .pr_type =      SOCK_RAW,
  636         .pr_domain =    &inetdomain,
  637         .pr_protocol =  IPPROTO_IPV6,
  638         .pr_flags =     PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  639         .pr_input =     ip4_input6,
  640         .pr_ctloutput = rip_ctloutput,
  641         .pr_usrreqs =   &rip_usrreqs
  642 };
  643 #endif /* INET6 && INET */
  644 
  645 #if defined(INET)
  646 /*
  647  * Check the encapsulated packet to see if we want it
  648  */
  649 static int
  650 ipe4_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
  651 {
  652         /*
  653          * Only take packets coming from IPSEC tunnels; the rest
  654          * must be handled by the gif tunnel code.  Note that we
  655          * also return a minimum priority when we want the packet
  656          * so any explicit gif tunnels take precedence.
  657          */
  658         return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0);
  659 }
  660 #endif /* INET */
  661 
  662 static void
  663 ipe4_attach(void)
  664 {
  665 
  666         xform_register(&ipe4_xformsw);
  667         /* attach to encapsulation framework */
  668         /* XXX save return cookie for detach on module remove */
  669 #ifdef INET
  670         (void) encap_attach_func(AF_INET, -1,
  671                 ipe4_encapcheck, &ipe4_protosw, NULL);
  672 #endif
  673 #if defined(INET6) && defined(INET)
  674         (void) encap_attach_func(AF_INET6, -1,
  675                 ipe4_encapcheck, (struct protosw *)&ipe6_protosw, NULL);
  676 #endif
  677 }
  678 SYSINIT(ipe4_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipe4_attach, NULL);
  679 #endif  /* IPSEC */

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