route6.c

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

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

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