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

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    1 /*      $FreeBSD: src/sys/netinet6/route6.c,v 1.11.2.1.2.1 2007/04/26 23:41:59 cperciva Exp $   */
    2 /*      $KAME: route6.c,v 1.24 2001/03/14 03:07:05 itojun Exp $ */
    3 
    4 /*-
    5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 #include "opt_inet.h"
   34 #include "opt_inet6.h"
   35 
   36 #include <sys/param.h>
   37 #include <sys/mbuf.h>
   38 #include <sys/socket.h>
   39 #include <sys/systm.h>
   40 #include <sys/queue.h>
   41 
   42 #include <net/if.h>
   43 
   44 #include <netinet/in.h>
   45 #include <netinet6/in6_var.h>
   46 #include <netinet/ip6.h>
   47 #include <netinet6/ip6_var.h>
   48 #include <netinet6/scope6_var.h>
   49 
   50 #include <netinet/icmp6.h>
   51 
   52 extern int ip6_rthdr0_allowed;
   53 
   54 static int ip6_rthdr0 __P((struct mbuf *, struct ip6_hdr *,
   55     struct ip6_rthdr0 *));
   56 
   57 int
   58 route6_input(mp, offp, proto)
   59         struct mbuf **mp;
   60         int *offp, proto;       /* proto is unused */
   61 {
   62         struct ip6_hdr *ip6;
   63         struct mbuf *m = *mp;
   64         struct ip6_rthdr *rh;
   65         int off = *offp, rhlen;
   66         struct ip6aux *ip6a;
   67 
   68         ip6a = ip6_findaux(m);
   69         if (ip6a) {
   70                 /* XXX reject home-address option before rthdr */
   71                 if (ip6a->ip6a_flags & IP6A_SWAP) {
   72                         ip6stat.ip6s_badoptions++;
   73                         m_freem(m);
   74                         return IPPROTO_DONE;
   75                 }
   76         }
   77 
   78 #ifndef PULLDOWN_TEST
   79         IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
   80         ip6 = mtod(m, struct ip6_hdr *);
   81         rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
   82 #else
   83         ip6 = mtod(m, struct ip6_hdr *);
   84         IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
   85         if (rh == NULL) {
   86                 ip6stat.ip6s_tooshort++;
   87                 return IPPROTO_DONE;
   88         }
   89 #endif
   90 
   91         switch (rh->ip6r_type) {
   92         case IPV6_RTHDR_TYPE_0:
   93                 if (!ip6_rthdr0_allowed)
   94                         return (IPPROTO_DONE);
   95                 rhlen = (rh->ip6r_len + 1) << 3;
   96 #ifndef PULLDOWN_TEST
   97                 /*
   98                  * note on option length:
   99                  * due to IP6_EXTHDR_CHECK assumption, we cannot handle
  100                  * very big routing header (max rhlen == 2048).
  101                  */
  102                 IP6_EXTHDR_CHECK(m, off, rhlen, IPPROTO_DONE);
  103 #else
  104                 /*
  105                  * note on option length:
  106                  * maximum rhlen: 2048
  107                  * max mbuf m_pulldown can handle: MCLBYTES == usually 2048
  108                  * so, here we are assuming that m_pulldown can handle
  109                  * rhlen == 2048 case.  this may not be a good thing to
  110                  * assume - we may want to avoid pulling it up altogether.
  111                  */
  112                 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen);
  113                 if (rh == NULL) {
  114                         ip6stat.ip6s_tooshort++;
  115                         return IPPROTO_DONE;
  116                 }
  117 #endif
  118                 if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh))
  119                         return (IPPROTO_DONE);
  120                 break;
  121         default:
  122                 /* unknown routing type */
  123                 if (rh->ip6r_segleft == 0) {
  124                         rhlen = (rh->ip6r_len + 1) << 3;
  125                         break;  /* Final dst. Just ignore the header. */
  126                 }
  127                 ip6stat.ip6s_badoptions++;
  128                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
  129                             (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
  130                 return (IPPROTO_DONE);
  131         }
  132 
  133         *offp += rhlen;
  134         return (rh->ip6r_nxt);
  135 }
  136 
  137 /*
  138  * Type0 routing header processing
  139  *
  140  * RFC2292 backward compatibility warning: no support for strict/loose bitmap,
  141  * as it was dropped between RFC1883 and RFC2460.
  142  */
  143 static int
  144 ip6_rthdr0(m, ip6, rh0)
  145         struct mbuf *m;
  146         struct ip6_hdr *ip6;
  147         struct ip6_rthdr0 *rh0;
  148 {
  149         int addrs, index;
  150         struct in6_addr *nextaddr, tmpaddr;
  151         struct in6_ifaddr *ifa;
  152 
  153         if (rh0->ip6r0_segleft == 0)
  154                 return (0);
  155 
  156         if (rh0->ip6r0_len % 2
  157 #ifdef COMPAT_RFC1883
  158             || rh0->ip6r0_len > 46
  159 #endif
  160                 ) {
  161                 /*
  162                  * Type 0 routing header can't contain more than 23 addresses.
  163                  * RFC 2462: this limitation was removed since strict/loose
  164                  * bitmap field was deleted.
  165                  */
  166                 ip6stat.ip6s_badoptions++;
  167                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
  168                             (caddr_t)&rh0->ip6r0_len - (caddr_t)ip6);
  169                 return (-1);
  170         }
  171 
  172         if ((addrs = rh0->ip6r0_len / 2) < rh0->ip6r0_segleft) {
  173                 ip6stat.ip6s_badoptions++;
  174                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
  175                             (caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6);
  176                 return (-1);
  177         }
  178 
  179         index = addrs - rh0->ip6r0_segleft;
  180         rh0->ip6r0_segleft--;
  181         nextaddr = ((struct in6_addr *)(rh0 + 1)) + index;
  182 
  183         /*
  184          * reject invalid addresses.  be proactive about malicious use of
  185          * IPv4 mapped/compat address.
  186          * XXX need more checks?
  187          */
  188         if (IN6_IS_ADDR_MULTICAST(nextaddr) ||
  189             IN6_IS_ADDR_UNSPECIFIED(nextaddr) ||
  190             IN6_IS_ADDR_V4MAPPED(nextaddr) ||
  191             IN6_IS_ADDR_V4COMPAT(nextaddr)) {
  192                 ip6stat.ip6s_badoptions++;
  193                 m_freem(m);
  194                 return (-1);
  195         }
  196         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
  197             IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) ||
  198             IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) ||
  199             IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
  200                 ip6stat.ip6s_badoptions++;
  201                 m_freem(m);
  202                 return (-1);
  203         }
  204 
  205         /*
  206          * Determine the scope zone of the next hop, based on the interface
  207          * of the current hop. [RFC4007, Section 9]
  208          * Then disambiguate the scope zone for the next hop (if necessary).
  209          */
  210         if ((ifa = ip6_getdstifaddr(m)) == NULL)
  211                 goto bad;
  212         if (in6_setscope(nextaddr, ifa->ia_ifp, NULL) != 0) {
  213                 ip6stat.ip6s_badscope++;
  214                 goto bad;
  215         }
  216 
  217         /*
  218          * Swap the IPv6 destination address and nextaddr. Forward the packet.
  219          */
  220         tmpaddr = *nextaddr;
  221         *nextaddr = ip6->ip6_dst;
  222         in6_clearscope(nextaddr); /* XXX */
  223         ip6->ip6_dst = tmpaddr;
  224 
  225 #ifdef COMPAT_RFC1883
  226         if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8))))
  227                 ip6_forward(m, IPV6_SRCRT_NEIGHBOR);
  228         else
  229                 ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR);
  230 #else
  231         ip6_forward(m, 1);
  232 #endif
  233 
  234         return (-1);                    /* m would be freed in ip6_forward() */
  235 
  236   bad:
  237         m_freem(m);
  238         return (-1);
  239 }

Cache object: f81529739888b5e4c31308279945d834


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