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 /*      $FreeBSD$       */
    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 
   45 #include <sys/param.h>
   46 #include <sys/systm.h>
   47 #include <sys/mbuf.h>
   48 #include <sys/socket.h>
   49 #include <sys/kernel.h>
   50 #include <sys/protosw.h>
   51 #include <sys/sysctl.h>
   52 
   53 #include <net/if.h>
   54 #include <net/route.h>
   55 #include <net/netisr.h>
   56 
   57 #include <netinet/in.h>
   58 #include <netinet/in_systm.h>
   59 #include <netinet/in_var.h>
   60 #include <netinet/ip.h>
   61 #include <netinet/ip_ecn.h>
   62 #include <netinet/ip_var.h>
   63 #include <netinet/ip_encap.h>
   64 
   65 #include <netipsec/ipsec.h>
   66 #include <netipsec/xform.h>
   67 
   68 #include <netipsec/ipip_var.h>
   69 
   70 #ifdef MROUTING
   71 #include <netinet/ip_mroute.h>
   72 #endif
   73 
   74 #ifdef INET6
   75 #include <netinet/ip6.h>
   76 #include <netipsec/ipsec6.h>
   77 #include <netinet6/ip6_ecn.h>
   78 #include <netinet6/in6_var.h>
   79 #include <netinet6/ip6protosw.h>
   80 #endif
   81 
   82 #include <netipsec/key.h>
   83 #include <netipsec/key_debug.h>
   84 
   85 #include <machine/stdarg.h>
   86 
   87 /*
   88  * We can control the acceptance of IP4 packets by altering the sysctl
   89  * net.inet.ipip.allow value.  Zero means drop them, all else is acceptance.
   90  */
   91 int     ipip_allow = 0;
   92 struct  ipipstat ipipstat;
   93 
   94 SYSCTL_DECL(_net_inet_ipip);
   95 SYSCTL_INT(_net_inet_ipip, OID_AUTO,
   96         ipip_allow,     CTLFLAG_RW,     &ipip_allow,    0, "");
   97 SYSCTL_STRUCT(_net_inet_ipip, IPSECCTL_STATS,
   98         stats,          CTLFLAG_RD,     &ipipstat,      ipipstat, "");
   99 
  100 /* XXX IPCOMP */
  101 #define M_IPSEC (M_AUTHIPHDR|M_AUTHIPDGM|M_DECRYPTED)
  102 
  103 static void _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp);
  104 
  105 #ifdef INET6
  106 /*
  107  * Really only a wrapper for ipip_input(), for use with IPv6.
  108  */
  109 int
  110 ip4_input6(struct mbuf **m, int *offp, int proto)
  111 {
  112 #if 0
  113         /* If we do not accept IP-in-IP explicitly, drop.  */
  114         if (!ipip_allow && ((*m)->m_flags & M_IPSEC) == 0) {
  115                 DPRINTF(("%s: dropped due to policy\n", __func__));
  116                 ipipstat.ipips_pdrops++;
  117                 m_freem(*m);
  118                 return IPPROTO_DONE;
  119         }
  120 #endif
  121         _ipip_input(*m, *offp, NULL);
  122         return IPPROTO_DONE;
  123 }
  124 #endif /* INET6 */
  125 
  126 #ifdef INET
  127 /*
  128  * Really only a wrapper for ipip_input(), for use with IPv4.
  129  */
  130 void
  131 ip4_input(struct mbuf *m, int off)
  132 {
  133 #if 0
  134         /* If we do not accept IP-in-IP explicitly, drop.  */
  135         if (!ipip_allow && (m->m_flags & M_IPSEC) == 0) {
  136                 DPRINTF(("%s: dropped due to policy\n", __func__));
  137                 ipipstat.ipips_pdrops++;
  138                 m_freem(m);
  139                 return;
  140         }
  141 #endif
  142         _ipip_input(m, off, NULL);
  143 }
  144 #endif /* INET */
  145 
  146 /*
  147  * ipip_input gets called when we receive an IP{46} encapsulated packet,
  148  * either because we got it at a real interface, or because AH or ESP
  149  * were being used in tunnel mode (in which case the rcvif element will
  150  * contain the address of the encX interface associated with the tunnel.
  151  */
  152 
  153 static void
  154 _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp)
  155 {
  156         register struct sockaddr_in *sin;
  157         register struct ifnet *ifp;
  158         register struct ifaddr *ifa;
  159         struct ip *ipo;
  160 #ifdef INET6
  161         register struct sockaddr_in6 *sin6;
  162         struct ip6_hdr *ip6 = NULL;
  163         u_int8_t itos;
  164 #endif
  165         u_int8_t nxt;
  166         int isr;
  167         u_int8_t otos;
  168         u_int8_t v;
  169         int hlen;
  170 
  171         ipipstat.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.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.ipips_hdrops++;
  197                         return;
  198                 }
  199         }
  200 
  201         ipo = mtod(m, struct ip *);
  202 
  203 #ifdef MROUTING
  204         if (ipo->ip_v == IPVERSION && ipo->ip_p == IPPROTO_IPV4) {
  205                 if (IN_MULTICAST(((struct ip *)((char *) ipo + iphlen))->ip_dst.s_addr)) {
  206                         ipip_mroute_input (m, iphlen);
  207                         return;
  208                 }
  209         }
  210 #endif /* MROUTING */
  211 
  212         /* Keep outer ecn field. */
  213         switch (v >> 4) {
  214 #ifdef INET
  215         case 4:
  216                 otos = ipo->ip_tos;
  217                 break;
  218 #endif /* INET */
  219 #ifdef INET6
  220         case 6:
  221                 otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff;
  222                 break;
  223 #endif
  224         default:
  225                 panic("ipip_input: unknown ip version %u (outer)", v>>4);
  226         }
  227 
  228         /* Remove outer IP header */
  229         m_adj(m, iphlen);
  230 
  231         /* Sanity check */
  232         if (m->m_pkthdr.len < sizeof(struct ip))  {
  233                 ipipstat.ipips_hdrops++;
  234                 m_freem(m);
  235                 return;
  236         }
  237 
  238         m_copydata(m, 0, 1, &v);
  239 
  240         switch (v >> 4) {
  241 #ifdef INET
  242         case 4:
  243                 hlen = sizeof(struct ip);
  244                 break;
  245 #endif /* INET */
  246 
  247 #ifdef INET6
  248         case 6:
  249                 hlen = sizeof(struct ip6_hdr);
  250                 break;
  251 #endif
  252         default:
  253                 ipipstat.ipips_family++;
  254                 m_freem(m);
  255                 return; /* EAFNOSUPPORT */
  256         }
  257 
  258         /*
  259          * Bring the inner IP header in the first mbuf, if not there already.
  260          */
  261         if (m->m_len < hlen) {
  262                 if ((m = m_pullup(m, hlen)) == NULL) {
  263                         DPRINTF(("%s: m_pullup (2) failed\n", __func__));
  264                         ipipstat.ipips_hdrops++;
  265                         return;
  266                 }
  267         }
  268 
  269         /*
  270          * RFC 1853 specifies that the inner TTL should not be touched on
  271          * decapsulation. There's no reason this comment should be here, but
  272          * this is as good as any a position.
  273          */
  274 
  275         /* Some sanity checks in the inner IP header */
  276         switch (v >> 4) {
  277 #ifdef INET
  278         case 4:
  279                 ipo = mtod(m, struct ip *);
  280                 nxt = ipo->ip_p;
  281                 ip_ecn_egress(ip4_ipsec_ecn, &otos, &ipo->ip_tos);
  282                 break;
  283 #endif /* INET */
  284 #ifdef INET6
  285         case 6:
  286                 ip6 = (struct ip6_hdr *) ipo;
  287                 nxt = ip6->ip6_nxt;
  288                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  289                 ip_ecn_egress(ip6_ipsec_ecn, &otos, &itos);
  290                 ip6->ip6_flow &= ~htonl(0xff << 20);
  291                 ip6->ip6_flow |= htonl((u_int32_t) itos << 20);
  292                 break;
  293 #endif
  294         default:
  295                 panic("ipip_input: unknown ip version %u (inner)", v>>4);
  296         }
  297 
  298         /* Check for local address spoofing. */
  299         if ((m->m_pkthdr.rcvif == NULL ||
  300             !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) &&
  301             ipip_allow != 2) {
  302                 IFNET_RLOCK();
  303                 TAILQ_FOREACH(ifp, &ifnet, if_link) {
  304                         TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
  305 #ifdef INET
  306                                 if (ipo) {
  307                                         if (ifa->ifa_addr->sa_family !=
  308                                             AF_INET)
  309                                                 continue;
  310 
  311                                         sin = (struct sockaddr_in *) ifa->ifa_addr;
  312 
  313                                         if (sin->sin_addr.s_addr ==
  314                                             ipo->ip_src.s_addr) {
  315                                                 ipipstat.ipips_spoof++;
  316                                                 m_freem(m);
  317                                                 IFNET_RUNLOCK();
  318                                                 return;
  319                                         }
  320                                 }
  321 #endif /* INET */
  322 
  323 #ifdef INET6
  324                                 if (ip6) {
  325                                         if (ifa->ifa_addr->sa_family !=
  326                                             AF_INET6)
  327                                                 continue;
  328 
  329                                         sin6 = (struct sockaddr_in6 *) ifa->ifa_addr;
  330 
  331                                         if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_src)) {
  332                                                 ipipstat.ipips_spoof++;
  333                                                 m_freem(m);
  334                                                 IFNET_RUNLOCK();
  335                                                 return;
  336                                         }
  337 
  338                                 }
  339 #endif /* INET6 */
  340                         }
  341                 }
  342                 IFNET_RUNLOCK();
  343         }
  344 
  345         /* Statistics */
  346         ipipstat.ipips_ibytes += m->m_pkthdr.len - iphlen;
  347 
  348         /*
  349          * Interface pointer stays the same; if no IPsec processing has
  350          * been done (or will be done), this will point to a normal
  351          * interface. Otherwise, it'll point to an enc interface, which
  352          * will allow a packet filter to distinguish between secure and
  353          * untrusted packets.
  354          */
  355 
  356         switch (v >> 4) {
  357 #ifdef INET
  358         case 4:
  359                 isr = NETISR_IP;
  360                 break;
  361 #endif
  362 #ifdef INET6
  363         case 6:
  364                 isr = NETISR_IPV6;
  365                 break;
  366 #endif
  367         default:
  368                 panic("%s: bogus ip version %u", __func__, v>>4);
  369         }
  370 
  371         if (netisr_queue(isr, m)) {     /* (0) on success. */
  372                 ipipstat.ipips_qfull++;
  373                 DPRINTF(("%s: packet dropped because of full queue\n",
  374                         __func__));
  375         }
  376 }
  377 
  378 int
  379 ipip_output(
  380         struct mbuf *m,
  381         struct ipsecrequest *isr,
  382         struct mbuf **mp,
  383         int skip,
  384         int protoff
  385 )
  386 {
  387         struct secasvar *sav;
  388         u_int8_t tp, otos;
  389         struct secasindex *saidx;
  390         int error;
  391 #ifdef INET
  392         u_int8_t itos;
  393         struct ip *ipo;
  394 #endif /* INET */
  395 #ifdef INET6
  396         struct ip6_hdr *ip6, *ip6o;
  397 #endif /* INET6 */
  398 
  399         IPSEC_SPLASSERT_SOFTNET(__func__);
  400 
  401         sav = isr->sav;
  402         IPSEC_ASSERT(sav != NULL, ("null SA"));
  403         IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
  404 
  405         /* XXX Deal with empty TDB source/destination addresses. */
  406 
  407         m_copydata(m, 0, 1, &tp);
  408         tp = (tp >> 4) & 0xff;  /* Get the IP version number. */
  409 
  410         saidx = &sav->sah->saidx;
  411         switch (saidx->dst.sa.sa_family) {
  412 #ifdef INET
  413         case AF_INET:
  414                 if (saidx->src.sa.sa_family != AF_INET ||
  415                     saidx->src.sin.sin_addr.s_addr == INADDR_ANY ||
  416                     saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) {
  417                         DPRINTF(("%s: unspecified tunnel endpoint "
  418                             "address in SA %s/%08lx\n", __func__,
  419                             ipsec_address(&saidx->dst),
  420                             (u_long) ntohl(sav->spi)));
  421                         ipipstat.ipips_unspec++;
  422                         error = EINVAL;
  423                         goto bad;
  424                 }
  425 
  426                 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
  427                 if (m == 0) {
  428                         DPRINTF(("%s: M_PREPEND failed\n", __func__));
  429                         ipipstat.ipips_hdrops++;
  430                         error = ENOBUFS;
  431                         goto bad;
  432                 }
  433 
  434                 ipo = mtod(m, struct ip *);
  435 
  436                 ipo->ip_v = IPVERSION;
  437                 ipo->ip_hl = 5;
  438                 ipo->ip_len = htons(m->m_pkthdr.len);
  439                 ipo->ip_ttl = ip_defttl;
  440                 ipo->ip_sum = 0;
  441                 ipo->ip_src = saidx->src.sin.sin_addr;
  442                 ipo->ip_dst = saidx->dst.sin.sin_addr;
  443 
  444                 ipo->ip_id = ip_newid();
  445 
  446                 /* If the inner protocol is IP... */
  447                 if (tp == IPVERSION) {
  448                         /* Save ECN notification */
  449                         m_copydata(m, sizeof(struct ip) +
  450                             offsetof(struct ip, ip_tos),
  451                             sizeof(u_int8_t), (caddr_t) &itos);
  452 
  453                         ipo->ip_p = IPPROTO_IPIP;
  454 
  455                         /*
  456                          * We should be keeping tunnel soft-state and
  457                          * send back ICMPs if needed.
  458                          */
  459                         m_copydata(m, sizeof(struct ip) +
  460                             offsetof(struct ip, ip_off),
  461                             sizeof(u_int16_t), (caddr_t) &ipo->ip_off);
  462                         ipo->ip_off = ntohs(ipo->ip_off);
  463                         ipo->ip_off &= ~(IP_DF | IP_MF | IP_OFFMASK);
  464                         ipo->ip_off = htons(ipo->ip_off);
  465                 }
  466 #ifdef INET6
  467                 else if (tp == (IPV6_VERSION >> 4)) {
  468                         u_int32_t itos32;
  469 
  470                         /* Save ECN notification. */
  471                         m_copydata(m, sizeof(struct ip) +
  472                             offsetof(struct ip6_hdr, ip6_flow),
  473                             sizeof(u_int32_t), (caddr_t) &itos32);
  474                         itos = ntohl(itos32) >> 20;
  475                         ipo->ip_p = IPPROTO_IPV6;
  476                         ipo->ip_off = 0;
  477                 }
  478 #endif /* INET6 */
  479                 else {
  480                         goto nofamily;
  481                 }
  482 
  483                 otos = 0;
  484                 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
  485                 ipo->ip_tos = otos;
  486                 break;
  487 #endif /* INET */
  488 
  489 #ifdef INET6
  490         case AF_INET6:
  491                 if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) ||
  492                     saidx->src.sa.sa_family != AF_INET6 ||
  493                     IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) {
  494                         DPRINTF(("%s: unspecified tunnel endpoint "
  495                             "address in SA %s/%08lx\n", __func__,
  496                             ipsec_address(&saidx->dst),
  497                             (u_long) ntohl(sav->spi)));
  498                         ipipstat.ipips_unspec++;
  499                         error = ENOBUFS;
  500                         goto bad;
  501                 }
  502 
  503                 /* scoped address handling */
  504                 ip6 = mtod(m, struct ip6_hdr *);
  505                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
  506                         ip6->ip6_src.s6_addr16[1] = 0;
  507                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
  508                         ip6->ip6_dst.s6_addr16[1] = 0;
  509 
  510                 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
  511                 if (m == 0) {
  512                         DPRINTF(("%s: M_PREPEND failed\n", __func__));
  513                         ipipstat.ipips_hdrops++;
  514                         error = ENOBUFS;
  515                         goto bad;
  516                 }
  517 
  518                 /* Initialize IPv6 header */
  519                 ip6o = mtod(m, struct ip6_hdr *);
  520                 ip6o->ip6_flow = 0;
  521                 ip6o->ip6_vfc &= ~IPV6_VERSION_MASK;
  522                 ip6o->ip6_vfc |= IPV6_VERSION;
  523                 ip6o->ip6_plen = htons(m->m_pkthdr.len);
  524                 ip6o->ip6_hlim = ip_defttl;
  525                 ip6o->ip6_dst = saidx->dst.sin6.sin6_addr;
  526                 ip6o->ip6_src = saidx->src.sin6.sin6_addr;
  527 
  528 #ifdef INET
  529                 if (tp == IPVERSION) {
  530                         /* Save ECN notification */
  531                         m_copydata(m, sizeof(struct ip6_hdr) +
  532                             offsetof(struct ip, ip_tos), sizeof(u_int8_t),
  533                             (caddr_t) &itos);
  534 
  535                         /* This is really IPVERSION. */
  536                         ip6o->ip6_nxt = IPPROTO_IPIP;
  537                 } else
  538 #endif /* INET */
  539                         if (tp == (IPV6_VERSION >> 4)) {
  540                                 u_int32_t itos32;
  541 
  542                                 /* Save ECN notification. */
  543                                 m_copydata(m, sizeof(struct ip6_hdr) +
  544                                     offsetof(struct ip6_hdr, ip6_flow),
  545                                     sizeof(u_int32_t), (caddr_t) &itos32);
  546                                 itos = ntohl(itos32) >> 20;
  547 
  548                                 ip6o->ip6_nxt = IPPROTO_IPV6;
  549                         } else {
  550                                 goto nofamily;
  551                         }
  552 
  553                 otos = 0;
  554                 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
  555                 ip6o->ip6_flow |= htonl((u_int32_t) otos << 20);
  556                 break;
  557 #endif /* INET6 */
  558 
  559         default:
  560 nofamily:
  561                 DPRINTF(("%s: unsupported protocol family %u\n", __func__,
  562                     saidx->dst.sa.sa_family));
  563                 ipipstat.ipips_family++;
  564                 error = EAFNOSUPPORT;           /* XXX diffs from openbsd */
  565                 goto bad;
  566         }
  567 
  568         ipipstat.ipips_opackets++;
  569         *mp = m;
  570 
  571 #ifdef INET
  572         if (saidx->dst.sa.sa_family == AF_INET) {
  573 #if 0
  574                 if (sav->tdb_xform->xf_type == XF_IP4)
  575                         tdb->tdb_cur_bytes +=
  576                             m->m_pkthdr.len - sizeof(struct ip);
  577 #endif
  578                 ipipstat.ipips_obytes += m->m_pkthdr.len - sizeof(struct ip);
  579         }
  580 #endif /* INET */
  581 
  582 #ifdef INET6
  583         if (saidx->dst.sa.sa_family == AF_INET6) {
  584 #if 0
  585                 if (sav->tdb_xform->xf_type == XF_IP4)
  586                         tdb->tdb_cur_bytes +=
  587                             m->m_pkthdr.len - sizeof(struct ip6_hdr);
  588 #endif
  589                 ipipstat.ipips_obytes +=
  590                     m->m_pkthdr.len - sizeof(struct ip6_hdr);
  591         }
  592 #endif /* INET6 */
  593 
  594         return 0;
  595 bad:
  596         if (m)
  597                 m_freem(m);
  598         *mp = NULL;
  599         return (error);
  600 }
  601 
  602 #ifdef FAST_IPSEC
  603 static int
  604 ipe4_init(struct secasvar *sav, struct xformsw *xsp)
  605 {
  606         sav->tdb_xform = xsp;
  607         return 0;
  608 }
  609 
  610 static int
  611 ipe4_zeroize(struct secasvar *sav)
  612 {
  613         sav->tdb_xform = NULL;
  614         return 0;
  615 }
  616 
  617 static int
  618 ipe4_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  619 {
  620         /* This is a rather serious mistake, so no conditional printing. */
  621         printf("%s: should never be called\n", __func__);
  622         if (m)
  623                 m_freem(m);
  624         return EOPNOTSUPP;
  625 }
  626 
  627 static struct xformsw ipe4_xformsw = {
  628         XF_IP4,         0,              "IPv4 Simple Encapsulation",
  629         ipe4_init,      ipe4_zeroize,   ipe4_input,     ipip_output,
  630 };
  631 
  632 extern struct domain inetdomain;
  633 static struct protosw ipe4_protosw =
  634 { SOCK_RAW,     &inetdomain,    IPPROTO_IPV4,   PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  635   ip4_input,
  636                 0,              0,              rip_ctloutput,
  637   0,
  638   0,            0,              0,              0,
  639   &rip_usrreqs
  640 };
  641 #ifdef INET6
  642 static struct ip6protosw ipe6_protosw =
  643 { SOCK_RAW,     &inetdomain,    IPPROTO_IPV6,   PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  644   ip4_input6,
  645                 0,              0,              rip_ctloutput,
  646   0,
  647   0,            0,              0,              0,
  648   &rip_usrreqs
  649 };
  650 #endif
  651 
  652 /*
  653  * Check the encapsulated packet to see if we want it
  654  */
  655 static int
  656 ipe4_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
  657 {
  658         /*
  659          * Only take packets coming from IPSEC tunnels; the rest
  660          * must be handled by the gif tunnel code.  Note that we
  661          * also return a minimum priority when we want the packet
  662          * so any explicit gif tunnels take precedence.
  663          */
  664         return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0);
  665 }
  666 
  667 static void
  668 ipe4_attach(void)
  669 {
  670         xform_register(&ipe4_xformsw);
  671         /* attach to encapsulation framework */
  672         /* XXX save return cookie for detach on module remove */
  673         (void) encap_attach_func(AF_INET, -1,
  674                 ipe4_encapcheck, &ipe4_protosw, NULL);
  675 #ifdef INET6
  676         (void) encap_attach_func(AF_INET6, -1,
  677                 ipe4_encapcheck, (struct protosw *)&ipe6_protosw, NULL);
  678 #endif
  679 }
  680 SYSINIT(ipe4_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipe4_attach, NULL);
  681 #endif  /* FAST_IPSEC */

Cache object: 50bba6a2db6152a413f3d095d04fe44e


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