The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/netipsec/xform_ipip.c

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 /*      $FreeBSD: releng/10.3/sys/netipsec/xform_ipip.c 283901 2015-06-02 03:14:42Z 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/netisr.h>
   57 #include <net/vnet.h>
   58 
   59 #include <netinet/in.h>
   60 #include <netinet/in_systm.h>
   61 #include <netinet/in_var.h>
   62 #include <netinet/ip.h>
   63 #include <netinet/ip_ecn.h>
   64 #include <netinet/ip_var.h>
   65 #include <netinet/ip_encap.h>
   66 
   67 #include <netipsec/ipsec.h>
   68 #include <netipsec/xform.h>
   69 
   70 #include <netipsec/ipip_var.h>
   71 
   72 #ifdef INET6
   73 #include <netinet/ip6.h>
   74 #include <netipsec/ipsec6.h>
   75 #include <netinet6/ip6_ecn.h>
   76 #include <netinet6/in6_var.h>
   77 #include <netinet6/ip6protosw.h>
   78 #endif
   79 
   80 #include <netipsec/key.h>
   81 #include <netipsec/key_debug.h>
   82 
   83 #include <machine/stdarg.h>
   84 
   85 /*
   86  * We can control the acceptance of IP4 packets by altering the sysctl
   87  * net.inet.ipip.allow value.  Zero means drop them, all else is acceptance.
   88  */
   89 VNET_DEFINE(int, ipip_allow) = 0;
   90 VNET_PCPUSTAT_DEFINE(struct ipipstat, ipipstat);
   91 VNET_PCPUSTAT_SYSINIT(ipipstat);
   92 
   93 #ifdef VIMAGE
   94 VNET_PCPUSTAT_SYSUNINIT(ipipstat);
   95 #endif /* VIMAGE */
   96 
   97 SYSCTL_DECL(_net_inet_ipip);
   98 SYSCTL_VNET_INT(_net_inet_ipip, OID_AUTO,
   99         ipip_allow,     CTLFLAG_RW,     &VNET_NAME(ipip_allow), 0, "");
  100 SYSCTL_VNET_PCPUSTAT(_net_inet_ipip, IPSECCTL_STATS, stats,
  101     struct ipipstat, ipipstat,
  102     "IPIP statistics (struct ipipstat, netipsec/ipip_var.h)");
  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 (!V_ipip_allow && ((*m)->m_flags & M_IPSEC) == 0) {
  119                 DPRINTF(("%s: dropped due to policy\n", __func__));
  120                 IPIPSTAT_INC(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, int off)
  136 {
  137 #if 0
  138         /* If we do not accept IP-in-IP explicitly, drop.  */
  139         if (!V_ipip_allow && (m->m_flags & M_IPSEC) == 0) {
  140                 DPRINTF(("%s: dropped due to policy\n", __func__));
  141                 IPIPSTAT_INC(ipips_pdrops);
  142                 m_freem(m);
  143                 return;
  144         }
  145 #endif
  146         _ipip_input(m, off, NULL);
  147 }
  148 #endif /* INET */
  149 
  150 /*
  151  * ipip_input gets called when we receive an IP{46} encapsulated packet,
  152  * either because we got it at a real interface, or because AH or ESP
  153  * were being used in tunnel mode (in which case the rcvif element will
  154  * contain the address of the encX interface associated with the tunnel.
  155  */
  156 
  157 static void
  158 _ipip_input(struct mbuf *m, int iphlen, struct ifnet *gifp)
  159 {
  160         struct ip *ipo;
  161 #ifdef INET6
  162         struct ip6_hdr *ip6 = NULL;
  163         u_int8_t itos;
  164 #endif
  165         int isr;
  166         u_int8_t otos;
  167         u_int8_t v;
  168         int hlen;
  169 
  170         IPIPSTAT_INC(ipips_ipackets);
  171 
  172         m_copydata(m, 0, 1, &v);
  173 
  174         switch (v >> 4) {
  175 #ifdef INET
  176         case 4:
  177                 hlen = sizeof(struct ip);
  178                 break;
  179 #endif /* INET */
  180 #ifdef INET6
  181         case 6:
  182                 hlen = sizeof(struct ip6_hdr);
  183                 break;
  184 #endif
  185         default:
  186                 IPIPSTAT_INC(ipips_family);
  187                 m_freem(m);
  188                 return /* EAFNOSUPPORT */;
  189         }
  190 
  191         /* Bring the IP header in the first mbuf, if not there already */
  192         if (m->m_len < hlen) {
  193                 if ((m = m_pullup(m, hlen)) == NULL) {
  194                         DPRINTF(("%s: m_pullup (1) failed\n", __func__));
  195                         IPIPSTAT_INC(ipips_hdrops);
  196                         return;
  197                 }
  198         }
  199         ipo = mtod(m, struct ip *);
  200 
  201         /* Keep outer ecn field. */
  202         switch (v >> 4) {
  203 #ifdef INET
  204         case 4:
  205                 otos = ipo->ip_tos;
  206                 break;
  207 #endif /* INET */
  208 #ifdef INET6
  209         case 6:
  210                 otos = (ntohl(mtod(m, struct ip6_hdr *)->ip6_flow) >> 20) & 0xff;
  211                 break;
  212 #endif
  213         default:
  214                 panic("ipip_input: unknown ip version %u (outer)", v>>4);
  215         }
  216 
  217         /* Remove outer IP header */
  218         m_adj(m, iphlen);
  219 
  220         /* Sanity check */
  221         if (m->m_pkthdr.len < sizeof(struct ip))  {
  222                 IPIPSTAT_INC(ipips_hdrops);
  223                 m_freem(m);
  224                 return;
  225         }
  226 
  227         m_copydata(m, 0, 1, &v);
  228 
  229         switch (v >> 4) {
  230 #ifdef INET
  231         case 4:
  232                 hlen = sizeof(struct ip);
  233                 break;
  234 #endif /* INET */
  235 
  236 #ifdef INET6
  237         case 6:
  238                 hlen = sizeof(struct ip6_hdr);
  239                 break;
  240 #endif
  241         default:
  242                 IPIPSTAT_INC(ipips_family);
  243                 m_freem(m);
  244                 return; /* EAFNOSUPPORT */
  245         }
  246 
  247         /*
  248          * Bring the inner IP header in the first mbuf, if not there already.
  249          */
  250         if (m->m_len < hlen) {
  251                 if ((m = m_pullup(m, hlen)) == NULL) {
  252                         DPRINTF(("%s: m_pullup (2) failed\n", __func__));
  253                         IPIPSTAT_INC(ipips_hdrops);
  254                         return;
  255                 }
  256         }
  257 
  258         /*
  259          * RFC 1853 specifies that the inner TTL should not be touched on
  260          * decapsulation. There's no reason this comment should be here, but
  261          * this is as good as any a position.
  262          */
  263 
  264         /* Some sanity checks in the inner IP header */
  265         switch (v >> 4) {
  266 #ifdef INET
  267         case 4:
  268                 ipo = mtod(m, struct ip *);
  269                 ip_ecn_egress(V_ip4_ipsec_ecn, &otos, &ipo->ip_tos);
  270                 break;
  271 #endif /* INET */
  272 #ifdef INET6
  273         case 6:
  274                 ip6 = (struct ip6_hdr *) ipo;
  275                 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
  276                 ip_ecn_egress(V_ip6_ipsec_ecn, &otos, &itos);
  277                 ip6->ip6_flow &= ~htonl(0xff << 20);
  278                 ip6->ip6_flow |= htonl((u_int32_t) itos << 20);
  279                 break;
  280 #endif
  281         default:
  282                 panic("ipip_input: unknown ip version %u (inner)", v>>4);
  283         }
  284 
  285         /* Check for local address spoofing. */
  286         if ((m->m_pkthdr.rcvif == NULL ||
  287             !(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK)) &&
  288             V_ipip_allow != 2) {
  289 #ifdef INET
  290                 if ((v >> 4) == IPVERSION &&
  291                     in_localip(ipo->ip_src) != 0) {
  292                         IPIPSTAT_INC(ipips_spoof);
  293                         m_freem(m);
  294                         return;
  295                 }
  296 #endif
  297 #ifdef INET6
  298                 if ((v & IPV6_VERSION_MASK) == IPV6_VERSION &&
  299                     in6_localip(&ip6->ip6_src) != 0) {
  300                         IPIPSTAT_INC(ipips_spoof);
  301                         m_freem(m);
  302                         return;
  303                 }
  304 #endif
  305         }
  306 
  307         /* Statistics */
  308         IPIPSTAT_ADD(ipips_ibytes, m->m_pkthdr.len - iphlen);
  309 
  310         /*
  311          * Interface pointer stays the same; if no IPsec processing has
  312          * been done (or will be done), this will point to a normal
  313          * interface. Otherwise, it'll point to an enc interface, which
  314          * will allow a packet filter to distinguish between secure and
  315          * untrusted packets.
  316          */
  317 
  318         switch (v >> 4) {
  319 #ifdef INET
  320         case 4:
  321                 isr = NETISR_IP;
  322                 break;
  323 #endif
  324 #ifdef INET6
  325         case 6:
  326                 isr = NETISR_IPV6;
  327                 break;
  328 #endif
  329         default:
  330                 panic("%s: bogus ip version %u", __func__, v>>4);
  331         }
  332 
  333         if (netisr_queue(isr, m)) {     /* (0) on success. */
  334                 IPIPSTAT_INC(ipips_qfull);
  335                 DPRINTF(("%s: packet dropped because of full queue\n",
  336                         __func__));
  337         }
  338 }
  339 
  340 int
  341 ipip_output(
  342         struct mbuf *m,
  343         struct ipsecrequest *isr,
  344         struct mbuf **mp,
  345         int skip,
  346         int protoff
  347 )
  348 {
  349         struct secasvar *sav;
  350         u_int8_t tp, otos;
  351         struct secasindex *saidx;
  352         int error;
  353 #if defined(INET) || defined(INET6)
  354         u_int8_t itos;
  355 #endif
  356 #ifdef INET
  357         struct ip *ipo;
  358 #endif /* INET */
  359 #ifdef INET6
  360         struct ip6_hdr *ip6, *ip6o;
  361 #endif /* INET6 */
  362 
  363         sav = isr->sav;
  364         IPSEC_ASSERT(sav != NULL, ("null SA"));
  365         IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
  366 
  367         /* XXX Deal with empty TDB source/destination addresses. */
  368 
  369         m_copydata(m, 0, 1, &tp);
  370         tp = (tp >> 4) & 0xff;  /* Get the IP version number. */
  371 
  372         saidx = &sav->sah->saidx;
  373         switch (saidx->dst.sa.sa_family) {
  374 #ifdef INET
  375         case AF_INET:
  376                 if (saidx->src.sa.sa_family != AF_INET ||
  377                     saidx->src.sin.sin_addr.s_addr == INADDR_ANY ||
  378                     saidx->dst.sin.sin_addr.s_addr == INADDR_ANY) {
  379                         DPRINTF(("%s: unspecified tunnel endpoint "
  380                             "address in SA %s/%08lx\n", __func__,
  381                             ipsec_address(&saidx->dst),
  382                             (u_long) ntohl(sav->spi)));
  383                         IPIPSTAT_INC(ipips_unspec);
  384                         error = EINVAL;
  385                         goto bad;
  386                 }
  387 
  388                 M_PREPEND(m, sizeof(struct ip), M_NOWAIT);
  389                 if (m == 0) {
  390                         DPRINTF(("%s: M_PREPEND failed\n", __func__));
  391                         IPIPSTAT_INC(ipips_hdrops);
  392                         error = ENOBUFS;
  393                         goto bad;
  394                 }
  395 
  396                 ipo = mtod(m, struct ip *);
  397 
  398                 ipo->ip_v = IPVERSION;
  399                 ipo->ip_hl = 5;
  400                 ipo->ip_len = htons(m->m_pkthdr.len);
  401                 ipo->ip_ttl = V_ip_defttl;
  402                 ipo->ip_sum = 0;
  403                 ipo->ip_src = saidx->src.sin.sin_addr;
  404                 ipo->ip_dst = saidx->dst.sin.sin_addr;
  405 
  406                 ipo->ip_id = ip_newid();
  407 
  408                 /* If the inner protocol is IP... */
  409                 switch (tp) {
  410                 case IPVERSION:
  411                         /* Save ECN notification */
  412                         m_copydata(m, sizeof(struct ip) +
  413                             offsetof(struct ip, ip_tos),
  414                             sizeof(u_int8_t), (caddr_t) &itos);
  415 
  416                         ipo->ip_p = IPPROTO_IPIP;
  417 
  418                         /*
  419                          * We should be keeping tunnel soft-state and
  420                          * send back ICMPs if needed.
  421                          */
  422                         m_copydata(m, sizeof(struct ip) +
  423                             offsetof(struct ip, ip_off),
  424                             sizeof(u_int16_t), (caddr_t) &ipo->ip_off);
  425                         ipo->ip_off = ntohs(ipo->ip_off);
  426                         ipo->ip_off &= ~(IP_DF | IP_MF | IP_OFFMASK);
  427                         ipo->ip_off = htons(ipo->ip_off);
  428                         break;
  429 #ifdef INET6
  430                 case (IPV6_VERSION >> 4):
  431                 {
  432                         u_int32_t itos32;
  433 
  434                         /* Save ECN notification. */
  435                         m_copydata(m, sizeof(struct ip) +
  436                             offsetof(struct ip6_hdr, ip6_flow),
  437                             sizeof(u_int32_t), (caddr_t) &itos32);
  438                         itos = ntohl(itos32) >> 20;
  439                         ipo->ip_p = IPPROTO_IPV6;
  440                         ipo->ip_off = 0;
  441                         break;
  442                 }
  443 #endif /* INET6 */
  444                 default:
  445                         goto nofamily;
  446                 }
  447 
  448                 otos = 0;
  449                 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
  450                 ipo->ip_tos = otos;
  451                 break;
  452 #endif /* INET */
  453 
  454 #ifdef INET6
  455         case AF_INET6:
  456                 if (IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr) ||
  457                     saidx->src.sa.sa_family != AF_INET6 ||
  458                     IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr)) {
  459                         DPRINTF(("%s: unspecified tunnel endpoint "
  460                             "address in SA %s/%08lx\n", __func__,
  461                             ipsec_address(&saidx->dst),
  462                             (u_long) ntohl(sav->spi)));
  463                         IPIPSTAT_INC(ipips_unspec);
  464                         error = ENOBUFS;
  465                         goto bad;
  466                 }
  467 
  468                 /* scoped address handling */
  469                 ip6 = mtod(m, struct ip6_hdr *);
  470                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
  471                         ip6->ip6_src.s6_addr16[1] = 0;
  472                 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
  473                         ip6->ip6_dst.s6_addr16[1] = 0;
  474 
  475                 M_PREPEND(m, sizeof(struct ip6_hdr), M_NOWAIT);
  476                 if (m == 0) {
  477                         DPRINTF(("%s: M_PREPEND failed\n", __func__));
  478                         IPIPSTAT_INC(ipips_hdrops);
  479                         error = ENOBUFS;
  480                         goto bad;
  481                 }
  482 
  483                 /* Initialize IPv6 header */
  484                 ip6o = mtod(m, struct ip6_hdr *);
  485                 ip6o->ip6_flow = 0;
  486                 ip6o->ip6_vfc &= ~IPV6_VERSION_MASK;
  487                 ip6o->ip6_vfc |= IPV6_VERSION;
  488                 ip6o->ip6_hlim = IPV6_DEFHLIM;
  489                 ip6o->ip6_dst = saidx->dst.sin6.sin6_addr;
  490                 ip6o->ip6_src = saidx->src.sin6.sin6_addr;
  491                 ip6o->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6));
  492 
  493                 switch (tp) {
  494 #ifdef INET
  495                 case IPVERSION:
  496                         /* Save ECN notification */
  497                         m_copydata(m, sizeof(struct ip6_hdr) +
  498                             offsetof(struct ip, ip_tos), sizeof(u_int8_t),
  499                             (caddr_t) &itos);
  500 
  501                         /* This is really IPVERSION. */
  502                         ip6o->ip6_nxt = IPPROTO_IPIP;
  503                         break;
  504 #endif /* INET */
  505                 case (IPV6_VERSION >> 4):
  506                 {
  507                         u_int32_t itos32;
  508 
  509                         /* Save ECN notification. */
  510                         m_copydata(m, sizeof(struct ip6_hdr) +
  511                             offsetof(struct ip6_hdr, ip6_flow),
  512                             sizeof(u_int32_t), (caddr_t) &itos32);
  513                         itos = ntohl(itos32) >> 20;
  514 
  515                         ip6o->ip6_nxt = IPPROTO_IPV6;
  516                         break;
  517                 }
  518                 default:
  519                         goto nofamily;
  520                 }
  521 
  522                 otos = 0;
  523                 ip_ecn_ingress(V_ip6_ipsec_ecn, &otos, &itos);
  524                 ip6o->ip6_flow |= htonl((u_int32_t) otos << 20);
  525                 break;
  526 #endif /* INET6 */
  527 
  528         default:
  529 nofamily:
  530                 DPRINTF(("%s: unsupported protocol family %u\n", __func__,
  531                     saidx->dst.sa.sa_family));
  532                 IPIPSTAT_INC(ipips_family);
  533                 error = EAFNOSUPPORT;           /* XXX diffs from openbsd */
  534                 goto bad;
  535         }
  536 
  537         IPIPSTAT_INC(ipips_opackets);
  538         *mp = m;
  539 
  540 #ifdef INET
  541         if (saidx->dst.sa.sa_family == AF_INET) {
  542 #if 0
  543                 if (sav->tdb_xform->xf_type == XF_IP4)
  544                         tdb->tdb_cur_bytes +=
  545                             m->m_pkthdr.len - sizeof(struct ip);
  546 #endif
  547                 IPIPSTAT_ADD(ipips_obytes,
  548                     m->m_pkthdr.len - sizeof(struct ip));
  549         }
  550 #endif /* INET */
  551 
  552 #ifdef INET6
  553         if (saidx->dst.sa.sa_family == AF_INET6) {
  554 #if 0
  555                 if (sav->tdb_xform->xf_type == XF_IP4)
  556                         tdb->tdb_cur_bytes +=
  557                             m->m_pkthdr.len - sizeof(struct ip6_hdr);
  558 #endif
  559                 IPIPSTAT_ADD(ipips_obytes,
  560                     m->m_pkthdr.len - sizeof(struct ip6_hdr));
  561         }
  562 #endif /* INET6 */
  563 
  564         return 0;
  565 bad:
  566         if (m)
  567                 m_freem(m);
  568         *mp = NULL;
  569         return (error);
  570 }
  571 
  572 #ifdef IPSEC
  573 #if defined(INET) || defined(INET6)
  574 static int
  575 ipe4_init(struct secasvar *sav, struct xformsw *xsp)
  576 {
  577         sav->tdb_xform = xsp;
  578         return 0;
  579 }
  580 
  581 static int
  582 ipe4_zeroize(struct secasvar *sav)
  583 {
  584         sav->tdb_xform = NULL;
  585         return 0;
  586 }
  587 
  588 static int
  589 ipe4_input(struct mbuf *m, struct secasvar *sav, int skip, int protoff)
  590 {
  591         /* This is a rather serious mistake, so no conditional printing. */
  592         printf("%s: should never be called\n", __func__);
  593         if (m)
  594                 m_freem(m);
  595         return EOPNOTSUPP;
  596 }
  597 
  598 static struct xformsw ipe4_xformsw = {
  599         XF_IP4,         0,              "IPv4 Simple Encapsulation",
  600         ipe4_init,      ipe4_zeroize,   ipe4_input,     ipip_output,
  601 };
  602 
  603 extern struct domain inetdomain;
  604 #endif /* INET || INET6 */
  605 #ifdef INET
  606 static struct protosw ipe4_protosw = {
  607         .pr_type =      SOCK_RAW,
  608         .pr_domain =    &inetdomain,
  609         .pr_protocol =  IPPROTO_IPV4,
  610         .pr_flags =     PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  611         .pr_input =     ip4_input,
  612         .pr_ctloutput = rip_ctloutput,
  613         .pr_usrreqs =   &rip_usrreqs
  614 };
  615 #endif /* INET */
  616 #if defined(INET6) && defined(INET)
  617 static struct ip6protosw ipe6_protosw = {
  618         .pr_type =      SOCK_RAW,
  619         .pr_domain =    &inetdomain,
  620         .pr_protocol =  IPPROTO_IPV6,
  621         .pr_flags =     PR_ATOMIC|PR_ADDR|PR_LASTHDR,
  622         .pr_input =     ip4_input6,
  623         .pr_ctloutput = rip_ctloutput,
  624         .pr_usrreqs =   &rip_usrreqs
  625 };
  626 #endif /* INET6 && INET */
  627 
  628 #ifdef INET
  629 /*
  630  * Check the encapsulated packet to see if we want it
  631  */
  632 static int
  633 ipe4_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
  634 {
  635         /*
  636          * Only take packets coming from IPSEC tunnels; the rest
  637          * must be handled by the gif tunnel code.  Note that we
  638          * also return a minimum priority when we want the packet
  639          * so any explicit gif tunnels take precedence.
  640          */
  641         return ((m->m_flags & M_IPSEC) != 0 ? 1 : 0);
  642 }
  643 #endif /* INET */
  644 
  645 static void
  646 ipe4_attach(void)
  647 {
  648 
  649         xform_register(&ipe4_xformsw);
  650         /* attach to encapsulation framework */
  651         /* XXX save return cookie for detach on module remove */
  652 #ifdef INET
  653         (void) encap_attach_func(AF_INET, -1,
  654                 ipe4_encapcheck, &ipe4_protosw, NULL);
  655 #endif
  656 #if defined(INET6) && defined(INET)
  657         (void) encap_attach_func(AF_INET6, -1,
  658                 ipe4_encapcheck, (struct protosw *)&ipe6_protosw, NULL);
  659 #endif
  660 }
  661 SYSINIT(ipe4_xform_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ipe4_attach, NULL);
  662 #endif  /* IPSEC */

Cache object: 547bc5416099b58285a1682920517815


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.