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


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

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    1 /*      $FreeBSD: releng/5.3/sys/netinet6/route6.c 136588 2004-10-16 08:43:07Z cvs2svn $        */
    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 
   49 #include <netinet/icmp6.h>
   50 
   51 static int ip6_rthdr0 __P((struct mbuf *, struct ip6_hdr *,
   52     struct ip6_rthdr0 *));
   53 
   54 int
   55 route6_input(mp, offp, proto)
   56         struct mbuf **mp;
   57         int *offp, proto;       /* proto is unused */
   58 {
   59         struct ip6_hdr *ip6;
   60         struct mbuf *m = *mp;
   61         struct ip6_rthdr *rh;
   62         int off = *offp, rhlen;
   63         struct ip6aux *ip6a;
   64 
   65         ip6a = ip6_findaux(m);
   66         if (ip6a) {
   67                 /* XXX reject home-address option before rthdr */
   68                 if (ip6a->ip6a_flags & IP6A_SWAP) {
   69                         ip6stat.ip6s_badoptions++;
   70                         m_freem(m);
   71                         return IPPROTO_DONE;
   72                 }
   73         }
   74 
   75 #ifndef PULLDOWN_TEST
   76         IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
   77         ip6 = mtod(m, struct ip6_hdr *);
   78         rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
   79 #else
   80         ip6 = mtod(m, struct ip6_hdr *);
   81         IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
   82         if (rh == NULL) {
   83                 ip6stat.ip6s_tooshort++;
   84                 return IPPROTO_DONE;
   85         }
   86 #endif
   87 
   88         switch (rh->ip6r_type) {
   89         case IPV6_RTHDR_TYPE_0:
   90                 rhlen = (rh->ip6r_len + 1) << 3;
   91 #ifndef PULLDOWN_TEST
   92                 /*
   93                  * note on option length:
   94                  * due to IP6_EXTHDR_CHECK assumption, we cannot handle
   95                  * very big routing header (max rhlen == 2048).
   96                  */
   97                 IP6_EXTHDR_CHECK(m, off, rhlen, IPPROTO_DONE);
   98 #else
   99                 /*
  100                  * note on option length:
  101                  * maximum rhlen: 2048
  102                  * max mbuf m_pulldown can handle: MCLBYTES == usually 2048
  103                  * so, here we are assuming that m_pulldown can handle
  104                  * rhlen == 2048 case.  this may not be a good thing to
  105                  * assume - we may want to avoid pulling it up altogether.
  106                  */
  107                 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen);
  108                 if (rh == NULL) {
  109                         ip6stat.ip6s_tooshort++;
  110                         return IPPROTO_DONE;
  111                 }
  112 #endif
  113                 if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh))
  114                         return (IPPROTO_DONE);
  115                 break;
  116         default:
  117                 /* unknown routing type */
  118                 if (rh->ip6r_segleft == 0) {
  119                         rhlen = (rh->ip6r_len + 1) << 3;
  120                         break;  /* Final dst. Just ignore the header. */
  121                 }
  122                 ip6stat.ip6s_badoptions++;
  123                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
  124                             (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
  125                 return (IPPROTO_DONE);
  126         }
  127 
  128         *offp += rhlen;
  129         return (rh->ip6r_nxt);
  130 }
  131 
  132 /*
  133  * Type0 routing header processing
  134  *
  135  * RFC2292 backward compatibility warning: no support for strict/loose bitmap,
  136  * as it was dropped between RFC1883 and RFC2460.
  137  */
  138 static int
  139 ip6_rthdr0(m, ip6, rh0)
  140         struct mbuf *m;
  141         struct ip6_hdr *ip6;
  142         struct ip6_rthdr0 *rh0;
  143 {
  144         int addrs, index;
  145         struct in6_addr *nextaddr, tmpaddr;
  146 
  147         if (rh0->ip6r0_segleft == 0)
  148                 return (0);
  149 
  150         if (rh0->ip6r0_len % 2
  151 #ifdef COMPAT_RFC1883
  152             || rh0->ip6r0_len > 46
  153 #endif
  154                 ) {
  155                 /*
  156                  * Type 0 routing header can't contain more than 23 addresses.
  157                  * RFC 2462: this limitation was removed since strict/loose
  158                  * bitmap field was deleted.
  159                  */
  160                 ip6stat.ip6s_badoptions++;
  161                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
  162                             (caddr_t)&rh0->ip6r0_len - (caddr_t)ip6);
  163                 return (-1);
  164         }
  165 
  166         if ((addrs = rh0->ip6r0_len / 2) < rh0->ip6r0_segleft) {
  167                 ip6stat.ip6s_badoptions++;
  168                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
  169                             (caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6);
  170                 return (-1);
  171         }
  172 
  173         index = addrs - rh0->ip6r0_segleft;
  174         rh0->ip6r0_segleft--;
  175         nextaddr = ((struct in6_addr *)(rh0 + 1)) + index;
  176 
  177         /*
  178          * reject invalid addresses.  be proactive about malicious use of
  179          * IPv4 mapped/compat address.
  180          * XXX need more checks?
  181          */
  182         if (IN6_IS_ADDR_MULTICAST(nextaddr) ||
  183             IN6_IS_ADDR_UNSPECIFIED(nextaddr) ||
  184             IN6_IS_ADDR_V4MAPPED(nextaddr) ||
  185             IN6_IS_ADDR_V4COMPAT(nextaddr)) {
  186                 ip6stat.ip6s_badoptions++;
  187                 m_freem(m);
  188                 return (-1);
  189         }
  190         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
  191             IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) ||
  192             IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) ||
  193             IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
  194                 ip6stat.ip6s_badoptions++;
  195                 m_freem(m);
  196                 return (-1);
  197         }
  198 
  199         /*
  200          * Swap the IPv6 destination address and nextaddr. Forward the packet.
  201          */
  202         tmpaddr = *nextaddr;
  203         *nextaddr = ip6->ip6_dst;
  204         if (IN6_IS_ADDR_LINKLOCAL(nextaddr))
  205                 nextaddr->s6_addr16[1] = 0;
  206         ip6->ip6_dst = tmpaddr;
  207         if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst))
  208                 ip6->ip6_dst.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index);
  209 
  210 #ifdef COMPAT_RFC1883
  211         if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8))))
  212                 ip6_forward(m, IPV6_SRCRT_NEIGHBOR);
  213         else
  214                 ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR);
  215 #else
  216         ip6_forward(m, 1);
  217 #endif
  218 
  219         return (-1);                    /* m would be freed in ip6_forward() */
  220 }

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