route6.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    1 /*-
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $KAME: route6.c,v 1.24 2001/03/14 03:07:05 itojun Exp $
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD$");
   34 
   35 #include "opt_inet.h"
   36 #include "opt_inet6.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/mbuf.h>
   40 #include <sys/socket.h>
   41 #include <sys/systm.h>
   42 #include <sys/queue.h>
   43 
   44 #include <net/if.h>
   45 
   46 #include <netinet/in.h>
   47 #include <netinet6/in6_var.h>
   48 #include <netinet/ip6.h>
   49 #include <netinet6/ip6_var.h>
   50 #include <netinet6/scope6_var.h>
   51 
   52 #include <netinet/icmp6.h>
   53 
   54 extern int ip6_rthdr0_allowed;
   55 
   56 static int ip6_rthdr0 __P((struct mbuf *, struct ip6_hdr *,
   57     struct ip6_rthdr0 *));
   58 
   59 int
   60 route6_input(mp, offp, proto)
   61         struct mbuf **mp;
   62         int *offp, proto;       /* proto is unused */
   63 {
   64         struct ip6_hdr *ip6;
   65         struct mbuf *m = *mp;
   66         struct ip6_rthdr *rh;
   67         int off = *offp, rhlen;
   68         struct ip6aux *ip6a;
   69 
   70         ip6a = ip6_findaux(m);
   71         if (ip6a) {
   72                 /* XXX reject home-address option before rthdr */
   73                 if (ip6a->ip6a_flags & IP6A_SWAP) {
   74                         ip6stat.ip6s_badoptions++;
   75                         m_freem(m);
   76                         return IPPROTO_DONE;
   77                 }
   78         }
   79 
   80 #ifndef PULLDOWN_TEST
   81         IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
   82         ip6 = mtod(m, struct ip6_hdr *);
   83         rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
   84 #else
   85         ip6 = mtod(m, struct ip6_hdr *);
   86         IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
   87         if (rh == NULL) {
   88                 ip6stat.ip6s_tooshort++;
   89                 return IPPROTO_DONE;
   90         }
   91 #endif
   92 
   93         switch (rh->ip6r_type) {
   94         case IPV6_RTHDR_TYPE_0:
   95                 if (!ip6_rthdr0_allowed)
   96                         return (IPPROTO_DONE);
   97                 rhlen = (rh->ip6r_len + 1) << 3;
   98 #ifndef PULLDOWN_TEST
   99                 /*
  100                  * note on option length:
  101                  * due to IP6_EXTHDR_CHECK assumption, we cannot handle
  102                  * very big routing header (max rhlen == 2048).
  103                  */
  104                 IP6_EXTHDR_CHECK(m, off, rhlen, IPPROTO_DONE);
  105 #else
  106                 /*
  107                  * note on option length:
  108                  * maximum rhlen: 2048
  109                  * max mbuf m_pulldown can handle: MCLBYTES == usually 2048
  110                  * so, here we are assuming that m_pulldown can handle
  111                  * rhlen == 2048 case.  this may not be a good thing to
  112                  * assume - we may want to avoid pulling it up altogether.
  113                  */
  114                 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen);
  115                 if (rh == NULL) {
  116                         ip6stat.ip6s_tooshort++;
  117                         return IPPROTO_DONE;
  118                 }
  119 #endif
  120                 if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh))
  121                         return (IPPROTO_DONE);
  122                 break;
  123         default:
  124                 /* unknown routing type */
  125                 if (rh->ip6r_segleft == 0) {
  126                         rhlen = (rh->ip6r_len + 1) << 3;
  127                         break;  /* Final dst. Just ignore the header. */
  128                 }
  129                 ip6stat.ip6s_badoptions++;
  130                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
  131                             (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
  132                 return (IPPROTO_DONE);
  133         }
  134 
  135         *offp += rhlen;
  136         return (rh->ip6r_nxt);
  137 }
  138 
  139 /*
  140  * Type0 routing header processing
  141  *
  142  * RFC2292 backward compatibility warning: no support for strict/loose bitmap,
  143  * as it was dropped between RFC1883 and RFC2460.
  144  */
  145 static int
  146 ip6_rthdr0(m, ip6, rh0)
  147         struct mbuf *m;
  148         struct ip6_hdr *ip6;
  149         struct ip6_rthdr0 *rh0;
  150 {
  151         int addrs, index;
  152         struct in6_addr *nextaddr, tmpaddr;
  153         struct in6_ifaddr *ifa;
  154 
  155         if (rh0->ip6r0_segleft == 0)
  156                 return (0);
  157 
  158         if (rh0->ip6r0_len % 2
  159 #ifdef COMPAT_RFC1883
  160             || rh0->ip6r0_len > 46
  161 #endif
  162                 ) {
  163                 /*
  164                  * Type 0 routing header can't contain more than 23 addresses.
  165                  * RFC 2462: this limitation was removed since strict/loose
  166                  * bitmap field was deleted.
  167                  */
  168                 ip6stat.ip6s_badoptions++;
  169                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
  170                             (caddr_t)&rh0->ip6r0_len - (caddr_t)ip6);
  171                 return (-1);
  172         }
  173 
  174         if ((addrs = rh0->ip6r0_len / 2) < rh0->ip6r0_segleft) {
  175                 ip6stat.ip6s_badoptions++;
  176                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
  177                             (caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6);
  178                 return (-1);
  179         }
  180 
  181         index = addrs - rh0->ip6r0_segleft;
  182         rh0->ip6r0_segleft--;
  183         nextaddr = ((struct in6_addr *)(rh0 + 1)) + index;
  184 
  185         /*
  186          * reject invalid addresses.  be proactive about malicious use of
  187          * IPv4 mapped/compat address.
  188          * XXX need more checks?
  189          */
  190         if (IN6_IS_ADDR_MULTICAST(nextaddr) ||
  191             IN6_IS_ADDR_UNSPECIFIED(nextaddr) ||
  192             IN6_IS_ADDR_V4MAPPED(nextaddr) ||
  193             IN6_IS_ADDR_V4COMPAT(nextaddr)) {
  194                 ip6stat.ip6s_badoptions++;
  195                 m_freem(m);
  196                 return (-1);
  197         }
  198         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
  199             IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) ||
  200             IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) ||
  201             IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
  202                 ip6stat.ip6s_badoptions++;
  203                 m_freem(m);
  204                 return (-1);
  205         }
  206 
  207         /*
  208          * Determine the scope zone of the next hop, based on the interface
  209          * of the current hop. [RFC4007, Section 9]
  210          * Then disambiguate the scope zone for the next hop (if necessary).
  211          */
  212         if ((ifa = ip6_getdstifaddr(m)) == NULL)
  213                 goto bad;
  214         if (in6_setscope(nextaddr, ifa->ia_ifp, NULL) != 0) {
  215                 ip6stat.ip6s_badscope++;
  216                 goto bad;
  217         }
  218 
  219         /*
  220          * Swap the IPv6 destination address and nextaddr. Forward the packet.
  221          */
  222         tmpaddr = *nextaddr;
  223         *nextaddr = ip6->ip6_dst;
  224         in6_clearscope(nextaddr); /* XXX */
  225         ip6->ip6_dst = tmpaddr;
  226 
  227 #ifdef COMPAT_RFC1883
  228         if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8))))
  229                 ip6_forward(m, IPV6_SRCRT_NEIGHBOR);
  230         else
  231                 ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR);
  232 #else
  233         ip6_forward(m, 1);
  234 #endif
  235 
  236         return (-1);                    /* m would be freed in ip6_forward() */
  237 
  238   bad:
  239         m_freem(m);
  240         return (-1);
  241 }

Cache object: a080a9b8e059cdc85e14df3c0b6bfb15

[ 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.

FreeBSD/Linux Kernel Cross Reference sys/netinet6/route6.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet6/route6.c