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

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    1 /*      $FreeBSD: releng/10.1/sys/netipsec/xform_ipip.c 264814 2014-04-23 11:22:54Z 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_PCPUSTAT_DEFINE(struct ipipstat, ipipstat);
   92 VNET_PCPUSTAT_SYSINIT(ipipstat);
   93 
   94 #ifdef VIMAGE
   95 VNET_PCPUSTAT_SYSUNINIT(ipipstat);
   96 #endif /* VIMAGE */
   97 
   98 SYSCTL_DECL(_net_inet_ipip);
   99 SYSCTL_VNET_INT(_net_inet_ipip, OID_AUTO,
  100         ipip_allow,     CTLFLAG_RW,     &VNET_NAME(ipip_allow), 0, "");
  101 SYSCTL_VNET_PCPUSTAT(_net_inet_ipip, IPSECCTL_STATS, stats,
  102     struct ipipstat, ipipstat,
  103     "IPIP statistics (struct ipipstat, netipsec/ipip_var.h)");
  104 
  105 /* XXX IPCOMP */
  106 #define M_IPSEC (M_AUTHIPHDR|M_AUTHIPDGM|M_DECRYPTED)
  107 
  108 static void _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp);
  109 
  110 #ifdef INET6
  111 /*
  112  * Really only a wrapper for ipip_input(), for use with IPv6.
  113  */
  114 int
  115 ip4_input6(struct mbuf **m, int *offp, int proto)
  116 {
  117 #if 0
  118         /* If we do not accept IP-in-IP explicitly, drop.  */
  119         if (!V_ipip_allow && ((*m)->m_flags & M_IPSEC) == 0) {
  120                 DPRINTF(("%s: dropped due to policy\n", __func__));
  121                 IPIPSTAT_INC(ipips_pdrops);
  122                 m_freem(*m);
  123                 return IPPROTO_DONE;
  124         }
  125 #endif
  126         _ipip_input(*m, *offp, NULL);
  127         return IPPROTO_DONE;
  128 }
  129 #endif /* INET6 */
  130 
  131 #ifdef INET
  132 /*
  133  * Really only a wrapper for ipip_input(), for use with IPv4.
  134  */
  135 void
  136 ip4_input(struct mbuf *m, int off)
  137 {
  138 #if 0
  139         /* If we do not accept IP-in-IP explicitly, drop.  */
  140         if (!V_ipip_allow && (m->m_flags & M_IPSEC) == 0) {
  141                 DPRINTF(("%s: dropped due to policy\n", __func__));
  142                 IPIPSTAT_INC(ipips_pdrops);
  143                 m_freem(m);
  144                 return;
  145         }
  146 #endif
  147         _ipip_input(m, off, NULL);
  148 }
  149 #endif /* INET */
  150 
  151 /*
  152  * ipip_input gets called when we receive an IP{46} encapsulated packet,
  153  * either because we got it at a real interface, or because AH or ESP
  154  * were being used in tunnel mode (in which case the rcvif element will
  155  * contain the address of the encX interface associated with the tunnel.
  156  */
  157 
  158 static void
  159 _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp)
  160 {
  161         struct ip *ipo;
  162 #ifdef INET6
  163         struct ip6_hdr *ip6 = NULL;
  164         u_int8_t itos;
  165 #endif
  166         int isr;
  167         u_int8_t otos;
  168         u_int8_t v;
  169         int hlen;
  170 
  171         IPIPSTAT_INC(ipips_ipackets);
  172 
  173         m_copydata(m, 0, 1, &v);
  174 
  175         switch (v >> 4) {
  176 #ifdef INET
  177         case 4:
  178                 hlen = sizeof(struct ip);
  179                 break;
  180 #endif /* INET */
  181 #ifdef INET6
  182         case 6:
  183                 hlen = sizeof(struct ip6_hdr);
  184                 break;
  185 #endif
  186         default:
  187                 IPIPSTAT_INC(ipips_family);
  188                 m_freem(m);
  189                 return /* EAFNOSUPPORT */;
  190         }
  191 
  192         /* Bring the IP header in the first mbuf, if not there already */
  193         if (m->m_len < hlen) {
  194                 if ((m = m_pullup(m, hlen)) == NULL) {
  195                         DPRINTF(("%s: m_pullup (1) failed\n", __func__));
  196                         IPIPSTAT_INC(ipips_hdrops);
  197                         return;
  198                 }
  199         }
  200         ipo = mtod(m, struct ip *);
  201 
  202         /* Keep outer ecn field. */
  203         switch (v >> 4) {
  204 #ifdef INET
  205         case 4:
  206                 otos = ipo->ip_tos;
  207                 break;
  208 #endif /* INET */
  209 #ifdef INET6
  210         case 6:
  211                 otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff;
  212                 break;
  213 #endif
  214         default:
  215                 panic("ipip_input: unknown ip version %u (outer)", v>>4);
  216         }
  217 
  218         /* Remove outer IP header */
  219         m_adj(m, iphlen);
  220 
  221         /* Sanity check */
  222         if (m->m_pkthdr.len < sizeof(struct ip))  {
  223                 IPIPSTAT_INC(ipips_hdrops);
  224                 m_freem(m);
  225                 return;
  226         }
  227 
  228         m_copydata(m, 0, 1, &v);
  229 
  230         switch (v >> 4) {
  231 #ifdef INET
  232         case 4:
  233                 hlen = sizeof(struct ip);
  234                 break;
  235 #endif /* INET */
  236 
  237 #ifdef INET6
  238         case 6:
  239                 hlen = sizeof(struct ip6_hdr);
  240                 break;
  241 #endif
  242         default:
  243                 IPIPSTAT_INC(ipips_family);
  244                 m_freem(m);
  245                 return; /* EAFNOSUPPORT */
  246         }
  247 
  248         /*
  249          * Bring the inner IP header in the first mbuf, if not there already.
  250          */
  251         if (m->m_len < hlen) {
  252                 if ((m = m_pullup(m, hlen)) == NULL) {
  253                         DPRINTF(("%s: m_pullup (2) failed\n", __func__));
  254                         IPIPSTAT_INC(ipips_hdrops);
  255                         return;
  256                 }
  257         }
  258 
  259         /*
  260          * RFC 1853 specifies that the inner TTL should not be touched on
  261          * decapsulation. There's no reason this comment should be here, but
  262          * this is as good as any a position.
  263          */
  264 
  265         /* Some sanity checks in the inner IP header */
  266         switch (v >> 4) {
  267 #ifdef INET
  268         case 4:
  269                 ipo = mtod(m, struct ip *);
  270                 ip_ecn_egress(V_ip4_ipsec_ecn, &otos, &ipo->ip_tos);
  271                 break;
  272 #endif /* INET */
  273 #ifdef INET6
  274         case 6:
  275                 ip6 = (struct ip6_hdr *) ipo;
  276                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  277                 ip_ecn_egress(V_ip6_ipsec_ecn, &otos, &itos);
  278                 ip6->ip6_flow &= ~htonl(0xff << 20);
  279                 ip6->ip6_flow |= htonl((u_int32_t) itos << 20);
  280                 break;
  281 #endif
  282         default:
  283                 panic("ipip_input: unknown ip version %u (inner)", v>>4);
  284         }
  285 
  286         /* Check for local address spoofing. */
  287         if ((m->m_pkthdr.rcvif == NULL ||
  288             !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) &&
  289             V_ipip_allow != 2) {
  290 #ifdef INET
  291                 if ((v >> 4) == IPVERSION &&
  292                     in_localip(ipo->ip_src) != 0) {
  293                         IPIPSTAT_INC(ipips_spoof);
  294                         m_freem(m);
  295                         return;
  296                 }
  297 #endif
  298 #ifdef INET6
  299                 if ((v & IPV6_VERSION_MASK) == IPV6_VERSION &&
  300                     in6_localip(&ip6->ip6_src) != 0) {
  301                         IPIPSTAT_INC(ipips_spoof);
  302                         m_freem(m);
  303                         return;
  304                 }
  305 #endif
  306         }
  307 
  308         /* Statistics */
  309         IPIPSTAT_ADD(ipips_ibytes, m->m_pkthdr.len - iphlen);
  310 
  311 #ifdef DEV_ENC
  312         switch (v >> 4) {
  313 #ifdef INET
  314         case 4:
  315                 ipsec_bpf(m, NULL, AF_INET, ENC_IN|ENC_AFTER);
  316                 break;
  317 #endif
  318 #ifdef INET6
  319         case 6:
  320                 ipsec_bpf(m, NULL, AF_INET6, ENC_IN|ENC_AFTER);
  321                 break;
  322 #endif
  323         default:
  324                 panic("%s: bogus ip version %u", __func__, v>>4);
  325         }
  326         /* pass the mbuf to enc0 for packet filtering */
  327         if (ipsec_filter(&m, PFIL_IN, ENC_IN|ENC_AFTER) != 0)
  328                 return;
  329 #endif
  330 
  331         /*
  332          * Interface pointer stays the same; if no IPsec processing has
  333          * been done (or will be done), this will point to a normal
  334          * interface. Otherwise, it'll point to an enc interface, which
  335          * will allow a packet filter to distinguish between secure and
  336          * untrusted packets.
  337          */
  338 
  339         switch (v >> 4) {
  340 #ifdef INET
  341         case 4:
  342                 isr = NETISR_IP;
  343                 break;
  344 #endif
  345 #ifdef INET6
  346         case 6:
  347                 isr = NETISR_IPV6;
  348                 break;
  349 #endif
  350         default:
  351                 panic("%s: bogus ip version %u", __func__, v>>4);
  352         }
  353 
  354         if (netisr_queue(isr, m)) {     /* (0) on success. */
  355                 IPIPSTAT_INC(ipips_qfull);
  356                 DPRINTF(("%s: packet dropped because of full queue\n",
  357                         __func__));
  358         }
  359 }
  360 
  361 int
  362 ipip_output(
  363         struct mbuf *m,
  364         struct ipsecrequest *isr,
  365         struct mbuf **mp,
  366         int skip,
  367         int protoff
  368 )
  369 {
  370         struct secasvar *sav;
  371         u_int8_t tp, otos;
  372         struct secasindex *saidx;
  373         int error;
  374 #if defined(INET) || defined(INET6)
  375         u_int8_t itos;
  376 #endif
  377 #ifdef INET
  378         struct ip *ipo;
  379 #endif /* INET */
  380 #ifdef INET6
  381         struct ip6_hdr *ip6, *ip6o;
  382 #endif /* INET6 */
  383 
  384         sav = isr->sav;
  385         IPSEC_ASSERT(sav != NULL, ("null SA"));
  386         IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
  387 
  388         /* XXX Deal with empty TDB source/destination addresses. */
  389 
  390         m_copydata(m, 0, 1, &tp);
  391         tp = (tp >> 4) & 0xff;  /* Get the IP version number. */
  392 
  393         saidx = &sav->sah->saidx;
  394         switch (saidx->dst.sa.sa_family) {
  395 #ifdef INET
  396         case AF_INET:
  397                 if (saidx->src.sa.sa_family != AF_INET ||
  398                     saidx->src.sin.sin_addr.s_addr == INADDR_ANY ||
  399                     saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) {
  400                         DPRINTF(("%s: unspecified tunnel endpoint "
  401                             "address in SA %s/%08lx\n", __func__,
  402                             ipsec_address(&saidx->dst),
  403                             (u_long) ntohl(sav->spi)));
  404                         IPIPSTAT_INC(ipips_unspec);
  405                         error = EINVAL;
  406                         goto bad;
  407                 }
  408 
  409                 M_PREPEND(m, sizeof(struct ip), M_NOWAIT);
  410                 if (m == 0) {
  411                         DPRINTF(("%s: M_PREPEND failed\n", __func__));
  412                         IPIPSTAT_INC(ipips_hdrops);
  413                         error = ENOBUFS;
  414                         goto bad;
  415                 }
  416 
  417                 ipo = mtod(m, struct ip *);
  418 
  419                 ipo->ip_v = IPVERSION;
  420                 ipo->ip_hl = 5;
  421                 ipo->ip_len = htons(m->m_pkthdr.len);
  422                 ipo->ip_ttl = V_ip_defttl;
  423                 ipo->ip_sum = 0;
  424                 ipo->ip_src = saidx->src.sin.sin_addr;
  425                 ipo->ip_dst = saidx->dst.sin.sin_addr;
  426 
  427                 ipo->ip_id = ip_newid();
  428 
  429                 /* If the inner protocol is IP... */
  430                 switch (tp) {
  431                 case IPVERSION:
  432                         /* Save ECN notification */
  433                         m_copydata(m, sizeof(struct ip) +
  434                             offsetof(struct ip, ip_tos),
  435                             sizeof(u_int8_t), (caddr_t) &itos);
  436 
  437                         ipo->ip_p = IPPROTO_IPIP;
  438 
  439                         /*
  440                          * We should be keeping tunnel soft-state and
  441                          * send back ICMPs if needed.
  442                          */
  443                         m_copydata(m, sizeof(struct ip) +
  444                             offsetof(struct ip, ip_off),
  445                             sizeof(u_int16_t), (caddr_t) &ipo->ip_off);
  446                         ipo->ip_off = ntohs(ipo->ip_off);
  447                         ipo->ip_off &= ~(IP_DF | IP_MF | IP_OFFMASK);
  448                         ipo->ip_off = htons(ipo->ip_off);
  449                         break;
  450 #ifdef INET6
  451                 case (IPV6_VERSION >> 4):
  452                 {
  453                         u_int32_t itos32;
  454 
  455                         /* Save ECN notification. */
  456                         m_copydata(m, sizeof(struct ip) +
  457                             offsetof(struct ip6_hdr, ip6_flow),
  458                             sizeof(u_int32_t), (caddr_t) &itos32);
  459                         itos = ntohl(itos32) >> 20;
  460                         ipo->ip_p = IPPROTO_IPV6;
  461                         ipo->ip_off = 0;
  462                         break;
  463                 }
  464 #endif /* INET6 */
  465                 default:
  466                         goto nofamily;
  467                 }
  468 
  469                 otos = 0;
  470                 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
  471                 ipo->ip_tos = otos;
  472                 break;
  473 #endif /* INET */
  474 
  475 #ifdef INET6
  476         case AF_INET6:
  477                 if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) ||
  478                     saidx->src.sa.sa_family != AF_INET6 ||
  479                     IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) {
  480                         DPRINTF(("%s: unspecified tunnel endpoint "
  481                             "address in SA %s/%08lx\n", __func__,
  482                             ipsec_address(&saidx->dst),
  483                             (u_long) ntohl(sav->spi)));
  484                         IPIPSTAT_INC(ipips_unspec);
  485                         error = ENOBUFS;
  486                         goto bad;
  487                 }
  488 
  489                 /* scoped address handling */
  490                 ip6 = mtod(m, struct ip6_hdr *);
  491                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
  492                         ip6->ip6_src.s6_addr16[1] = 0;
  493                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
  494                         ip6->ip6_dst.s6_addr16[1] = 0;
  495 
  496                 M_PREPEND(m, sizeof(struct ip6_hdr), M_NOWAIT);
  497                 if (m == 0) {
  498                         DPRINTF(("%s: M_PREPEND failed\n", __func__));
  499                         IPIPSTAT_INC(ipips_hdrops);
  500                         error = ENOBUFS;
  501                         goto bad;
  502                 }
  503 
  504                 /* Initialize IPv6 header */
  505                 ip6o = mtod(m, struct ip6_hdr *);
  506                 ip6o->ip6_flow = 0;
  507                 ip6o->ip6_vfc &= ~IPV6_VERSION_MASK;
  508                 ip6o->ip6_vfc |= IPV6_VERSION;
  509                 ip6o->ip6_plen = htons(m->m_pkthdr.len);
  510                 ip6o->ip6_hlim = V_ip_defttl;
  511                 ip6o->ip6_dst = saidx->dst.sin6.sin6_addr;
  512                 ip6o->ip6_src = saidx->src.sin6.sin6_addr;
  513 
  514                 switch (tp) {
  515 #ifdef INET
  516                 case IPVERSION:
  517                         /* Save ECN notification */
  518                         m_copydata(m, sizeof(struct ip6_hdr) +
  519                             offsetof(struct ip, ip_tos), sizeof(u_int8_t),
  520                             (caddr_t) &itos);
  521 
  522                         /* This is really IPVERSION. */
  523                         ip6o->ip6_nxt = IPPROTO_IPIP;
  524                         break;
  525 #endif /* INET */
  526                 case (IPV6_VERSION >> 4):
  527                 {
  528                         u_int32_t itos32;
  529 
  530                         /* Save ECN notification. */
  531                         m_copydata(m, sizeof(struct ip6_hdr) +
  532                             offsetof(struct ip6_hdr, ip6_flow),
  533                             sizeof(u_int32_t), (caddr_t) &itos32);
  534                         itos = ntohl(itos32) >> 20;
  535 
  536                         ip6o->ip6_nxt = IPPROTO_IPV6;
  537                         break;
  538                 }
  539                 default:
  540                         goto nofamily;
  541                 }
  542 
  543                 otos = 0;
  544                 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
  545                 ip6o->ip6_flow |= htonl((u_int32_t) otos << 20);
  546                 break;
  547 #endif /* INET6 */
  548 
  549         default:
  550 nofamily:
  551                 DPRINTF(("%s: unsupported protocol family %u\n", __func__,
  552                     saidx->dst.sa.sa_family));
  553                 IPIPSTAT_INC(ipips_family);
  554                 error = EAFNOSUPPORT;           /* XXX diffs from openbsd */
  555                 goto bad;
  556         }
  557 
  558         IPIPSTAT_INC(ipips_opackets);
  559         *mp = m;
  560 
  561 #ifdef INET
  562         if (saidx->dst.sa.sa_family == AF_INET) {
  563 #if 0
  564                 if (sav->tdb_xform->xf_type == XF_IP4)
  565                         tdb->tdb_cur_bytes +=
  566                             m->m_pkthdr.len - sizeof(struct ip);
  567 #endif
  568                 IPIPSTAT_ADD(ipips_obytes,
  569                     m->m_pkthdr.len - sizeof(struct ip));
  570         }
  571 #endif /* INET */
  572 
  573 #ifdef INET6
  574         if (saidx->dst.sa.sa_family == AF_INET6) {
  575 #if 0
  576                 if (sav->tdb_xform->xf_type == XF_IP4)
  577                         tdb->tdb_cur_bytes +=
  578                             m->m_pkthdr.len - sizeof(struct ip6_hdr);
  579 #endif
  580                 IPIPSTAT_ADD(ipips_obytes,
  581                     m->m_pkthdr.len - sizeof(struct ip6_hdr));
  582         }
  583 #endif /* INET6 */
  584 
  585         return 0;
  586 bad:
  587         if (m)
  588                 m_freem(m);
  589         *mp = NULL;
  590         return (error);
  591 }
  592 
  593 #ifdef IPSEC
  594 #if defined(INET) || defined(INET6)
  595 static int
  596 ipe4_init(struct secasvar *sav, struct xformsw *xsp)
  597 {
  598         sav->tdb_xform = xsp;
  599         return 0;
  600 }
  601 
  602 static int
  603 ipe4_zeroize(struct secasvar *sav)
  604 {
  605         sav->tdb_xform = NULL;
  606         return 0;
  607 }
  608 
  609 static int
  610 ipe4_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  611 {
  612         /* This is a rather serious mistake, so no conditional printing. */
  613         printf("%s: should never be called\n", __func__);
  614         if (m)
  615                 m_freem(m);
  616         return EOPNOTSUPP;
  617 }
  618 
  619 static struct xformsw ipe4_xformsw = {
  620         XF_IP4,         0,              "IPv4 Simple Encapsulation",
  621         ipe4_init,      ipe4_zeroize,   ipe4_input,     ipip_output,
  622 };
  623 
  624 extern struct domain inetdomain;
  625 #endif /* INET || INET6 */
  626 #ifdef INET
  627 static struct protosw ipe4_protosw = {
  628         .pr_type =      SOCK_RAW,
  629         .pr_domain =    &inetdomain,
  630         .pr_protocol =  IPPROTO_IPV4,
  631         .pr_flags =     PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  632         .pr_input =     ip4_input,
  633         .pr_ctloutput = rip_ctloutput,
  634         .pr_usrreqs =   &rip_usrreqs
  635 };
  636 #endif /* INET */
  637 #if defined(INET6) && defined(INET)
  638 static struct ip6protosw ipe6_protosw = {
  639         .pr_type =      SOCK_RAW,
  640         .pr_domain =    &inetdomain,
  641         .pr_protocol =  IPPROTO_IPV6,
  642         .pr_flags =     PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  643         .pr_input =     ip4_input6,
  644         .pr_ctloutput = rip_ctloutput,
  645         .pr_usrreqs =   &rip_usrreqs
  646 };
  647 #endif /* INET6 && INET */
  648 
  649 #ifdef INET
  650 /*
  651  * Check the encapsulated packet to see if we want it
  652  */
  653 static int
  654 ipe4_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
  655 {
  656         /*
  657          * Only take packets coming from IPSEC tunnels; the rest
  658          * must be handled by the gif tunnel code.  Note that we
  659          * also return a minimum priority when we want the packet
  660          * so any explicit gif tunnels take precedence.
  661          */
  662         return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0);
  663 }
  664 #endif /* INET */
  665 
  666 static void
  667 ipe4_attach(void)
  668 {
  669 
  670         xform_register(&ipe4_xformsw);
  671         /* attach to encapsulation framework */
  672         /* XXX save return cookie for detach on module remove */
  673 #ifdef INET
  674         (void) encap_attach_func(AF_INET, -1,
  675                 ipe4_encapcheck, &ipe4_protosw, NULL);
  676 #endif
  677 #if defined(INET6) && defined(INET)
  678         (void) encap_attach_func(AF_INET6, -1,
  679                 ipe4_encapcheck, (struct protosw *)&ipe6_protosw, NULL);
  680 #endif
  681 }
  682 SYSINIT(ipe4_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipe4_attach, NULL);
  683 #endif  /* IPSEC */

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