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 /*-
    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 #if 0
   55 static int ip6_rthdr0 __P((struct mbuf *, struct ip6_hdr *,
   56     struct ip6_rthdr0 *));
   57 
   58 #endif /* Disable route header processing. */
   59 
   60 /*
   61  * proto - is unused
   62  */
   63 
   64 int
   65 route6_input(struct mbuf **mp, int *offp, int proto)
   66 {
   67         struct ip6_hdr *ip6;
   68         struct mbuf *m = *mp;
   69         struct ip6_rthdr *rh;
   70         int off = *offp, rhlen;
   71         struct ip6aux *ip6a;
   72 
   73         ip6a = ip6_findaux(m);
   74         if (ip6a) {
   75                 /* XXX reject home-address option before rthdr */
   76                 if (ip6a->ip6a_flags & IP6A_SWAP) {
   77                         ip6stat.ip6s_badoptions++;
   78                         m_freem(m);
   79                         return IPPROTO_DONE;
   80                 }
   81         }
   82 
   83 #ifndef PULLDOWN_TEST
   84         IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
   85         ip6 = mtod(m, struct ip6_hdr *);
   86         rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
   87 #else
   88         ip6 = mtod(m, struct ip6_hdr *);
   89         IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
   90         if (rh == NULL) {
   91                 ip6stat.ip6s_tooshort++;
   92                 return IPPROTO_DONE;
   93         }
   94 #endif
   95 
   96         switch (rh->ip6r_type) {
   97 #if 0
   98         case IPV6_RTHDR_TYPE_0:
   99                 rhlen = (rh->ip6r_len + 1) << 3;
  100 #ifndef PULLDOWN_TEST
  101                 /*
  102                  * note on option length:
  103                  * due to IP6_EXTHDR_CHECK assumption, we cannot handle
  104                  * very big routing header (max rhlen == 2048).
  105                  */
  106                 IP6_EXTHDR_CHECK(m, off, rhlen, IPPROTO_DONE);
  107 #else
  108                 /*
  109                  * note on option length:
  110                  * maximum rhlen: 2048
  111                  * max mbuf m_pulldown can handle: MCLBYTES == usually 2048
  112                  * so, here we are assuming that m_pulldown can handle
  113                  * rhlen == 2048 case.  this may not be a good thing to
  114                  * assume - we may want to avoid pulling it up altogether.
  115                  */
  116                 IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen);
  117                 if (rh == NULL) {
  118                         ip6stat.ip6s_tooshort++;
  119                         return IPPROTO_DONE;
  120                 }
  121 #endif
  122                 if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh))
  123                         return (IPPROTO_DONE);
  124                 break;
  125 #endif /* Disable route header 0 */
  126         default:
  127                 /* unknown routing type */
  128                 if (rh->ip6r_segleft == 0) {
  129                         rhlen = (rh->ip6r_len + 1) << 3;
  130                         break;  /* Final dst. Just ignore the header. */
  131                 }
  132                 ip6stat.ip6s_badoptions++;
  133                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
  134                             (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
  135                 return (IPPROTO_DONE);
  136         }
  137 
  138         *offp += rhlen;
  139         return (rh->ip6r_nxt);
  140 }
  141 
  142 /*
  143  * Type0 routing header processing
  144  *
  145  * RFC2292 backward compatibility warning: no support for strict/loose bitmap,
  146  * as it was dropped between RFC1883 and RFC2460.
  147  */
  148 #if 0
  149 static int
  150 ip6_rthdr0(struct mbuf *m, struct ip6_hdr *ip6, struct ip6_rthdr0 *rh0)
  151 {
  152         int addrs, index;
  153         struct in6_addr *nextaddr, tmpaddr;
  154         struct in6_ifaddr *ifa;
  155 
  156         if (rh0->ip6r0_segleft == 0)
  157                 return (0);
  158 
  159         if (rh0->ip6r0_len % 2
  160 #ifdef COMPAT_RFC1883
  161             || rh0->ip6r0_len > 46
  162 #endif
  163                 ) {
  164                 /*
  165                  * Type 0 routing header can't contain more than 23 addresses.
  166                  * RFC 2462: this limitation was removed since strict/loose
  167                  * bitmap field was deleted.
  168                  */
  169                 ip6stat.ip6s_badoptions++;
  170                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
  171                             (caddr_t)&rh0->ip6r0_len - (caddr_t)ip6);
  172                 return (-1);
  173         }
  174 
  175         if ((addrs = rh0->ip6r0_len / 2) < rh0->ip6r0_segleft) {
  176                 ip6stat.ip6s_badoptions++;
  177                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
  178                             (caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6);
  179                 return (-1);
  180         }
  181 
  182         index = addrs - rh0->ip6r0_segleft;
  183         rh0->ip6r0_segleft--;
  184         nextaddr = ((struct in6_addr *)(rh0 + 1)) + index;
  185 
  186         /*
  187          * reject invalid addresses.  be proactive about malicious use of
  188          * IPv4 mapped/compat address.
  189          * XXX need more checks?
  190          */
  191         if (IN6_IS_ADDR_MULTICAST(nextaddr) ||
  192             IN6_IS_ADDR_UNSPECIFIED(nextaddr) ||
  193             IN6_IS_ADDR_V4MAPPED(nextaddr) ||
  194             IN6_IS_ADDR_V4COMPAT(nextaddr)) {
  195                 ip6stat.ip6s_badoptions++;
  196                 m_freem(m);
  197                 return (-1);
  198         }
  199         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
  200             IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) ||
  201             IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) ||
  202             IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
  203                 ip6stat.ip6s_badoptions++;
  204                 m_freem(m);
  205                 return (-1);
  206         }
  207 
  208         /*
  209          * Determine the scope zone of the next hop, based on the interface
  210          * of the current hop. [RFC4007, Section 9]
  211          * Then disambiguate the scope zone for the next hop (if necessary).
  212          */
  213         if ((ifa = ip6_getdstifaddr(m)) == NULL)
  214                 goto bad;
  215         if (in6_setscope(nextaddr, ifa->ia_ifp, NULL) != 0) {
  216                 ip6stat.ip6s_badscope++;
  217                 goto bad;
  218         }
  219 
  220         /*
  221          * Swap the IPv6 destination address and nextaddr. Forward the packet.
  222          */
  223         tmpaddr = *nextaddr;
  224         *nextaddr = ip6->ip6_dst;
  225         in6_clearscope(nextaddr); /* XXX */
  226         ip6->ip6_dst = tmpaddr;
  227 
  228 #ifdef COMPAT_RFC1883
  229         if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8))))
  230                 ip6_forward(m, IPV6_SRCRT_NEIGHBOR);
  231         else
  232                 ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR);
  233 #else
  234         ip6_forward(m, 1);
  235 #endif
  236 
  237         return (-1);                    /* m would be freed in ip6_forward() */
  238 
  239   bad:
  240         m_freem(m);
  241         return (-1);
  242 }
  243 #endif

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