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 /*      $NetBSD: route6.c,v 1.16.2.1 2007/04/28 18:30:13 bouyer Exp $   */
    2 /*      $KAME: route6.c,v 1.22 2000/12/03 00:54:00 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 <sys/cdefs.h>
   34 __KERNEL_RCSID(0, "$NetBSD: route6.c,v 1.16.2.1 2007/04/28 18:30:13 bouyer Exp $");
   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 int ip6_rht0 = -1;      /* disabled by default */
   53 
   54 static int ip6_rthdr0(struct mbuf *, struct ip6_hdr *, struct ip6_rthdr0 *);
   55 
   56 int
   57 route6_input(struct mbuf **mp, int *offp, int proto)
   58 {
   59         struct ip6_hdr *ip6;
   60         struct mbuf *m = *mp;
   61         struct ip6_rthdr *rh;
   62         int off = *offp, rhlen;
   63 
   64         ip6 = mtod(m, struct ip6_hdr *);
   65         IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
   66         if (rh == NULL) {
   67                 ip6stat.ip6s_tooshort++;
   68                 return IPPROTO_DONE;
   69         }
   70 
   71         switch (rh->ip6r_type) {
   72         case IPV6_RTHDR_TYPE_0:
   73                 if ((ip6_forwarding && ip6_rht0 == 0) || ip6_rht0 > 0) {
   74                         rhlen = (rh->ip6r_len + 1) << 3;
   75                         /*
   76                          * note on option length:
   77                          * maximum rhlen: 2048
   78                          * max mbuf m_pulldown can handle: MCLBYTES == usually
   79                          * 2048 so, here we are assuming that m_pulldown can
   80                          * handle hlen == 2048 case. This may not be a good
   81                          * thing to assume - we may want to avoid pulling it
   82                          * up altogether.
   83                          */
   84                         IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen);
   85                         if (rh == NULL) {
   86                                 ip6stat.ip6s_tooshort++;
   87                                 return IPPROTO_DONE;
   88                         }
   89                         if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh))
   90                                 return IPPROTO_DONE;
   91                         break;
   92                 }
   93                 /*FALLTHROUGH*/
   94         default:
   95                 /* unknown routing type */
   96                 if (rh->ip6r_segleft == 0) {
   97                         rhlen = (rh->ip6r_len + 1) << 3;
   98                         break;  /* Final dst. Just ignore the header. */
   99                 }
  100                 ip6stat.ip6s_badoptions++;
  101                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
  102                             (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
  103                 return (IPPROTO_DONE);
  104         }
  105 
  106         *offp += rhlen;
  107         return (rh->ip6r_nxt);
  108 }
  109 
  110 /*
  111  * Type0 routing header processing
  112  *
  113  * RFC2292 backward compatibility warning: no support for strict/loose bitmap,
  114  * as it was dropped between RFC1883 and RFC2460.
  115  */
  116 static int
  117 ip6_rthdr0(m, ip6, rh0)
  118         struct mbuf *m;
  119         struct ip6_hdr *ip6;
  120         struct ip6_rthdr0 *rh0;
  121 {
  122         int addrs, index;
  123         struct in6_addr *nextaddr, tmpaddr;
  124         struct in6_ifaddr *ifa;
  125 
  126         if (rh0->ip6r0_segleft == 0)
  127                 return (0);
  128 
  129         if (rh0->ip6r0_len % 2
  130 #ifdef COMPAT_RFC1883
  131             || rh0->ip6r0_len > 46
  132 #endif
  133                 ) {
  134                 /*
  135                  * Type 0 routing header can't contain more than 23 addresses.
  136                  * RFC 2462: this limitation was removed since strict/loose
  137                  * bitmap field was deleted.
  138                  */
  139                 ip6stat.ip6s_badoptions++;
  140                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
  141                             (caddr_t)&rh0->ip6r0_len - (caddr_t)ip6);
  142                 return (-1);
  143         }
  144 
  145         if ((addrs = rh0->ip6r0_len / 2) < rh0->ip6r0_segleft) {
  146                 ip6stat.ip6s_badoptions++;
  147                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
  148                             (caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6);
  149                 return (-1);
  150         }
  151 
  152         index = addrs - rh0->ip6r0_segleft;
  153         rh0->ip6r0_segleft--;
  154         nextaddr = ((struct in6_addr *)(rh0 + 1)) + index;
  155 
  156         /*
  157          * reject invalid addresses.  be proactive about malicious use of
  158          * IPv4 mapped/compat address.
  159          * XXX need more checks?
  160          */
  161         if (IN6_IS_ADDR_MULTICAST(nextaddr) ||
  162             IN6_IS_ADDR_UNSPECIFIED(nextaddr) ||
  163             IN6_IS_ADDR_V4MAPPED(nextaddr) ||
  164             IN6_IS_ADDR_V4COMPAT(nextaddr)) {
  165                 ip6stat.ip6s_badoptions++;
  166                 goto bad;
  167         }
  168         if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
  169             IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) ||
  170             IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) ||
  171             IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
  172                 ip6stat.ip6s_badoptions++;
  173                 goto bad;
  174         }
  175 
  176         /*
  177          * Determine the scope zone of the next hop, based on the interface
  178          * of the current hop. [RFC4007, Section 9]
  179          * Then disambiguate the scope zone for the next hop (if necessary). 
  180          */
  181         if ((ifa = ip6_getdstifaddr(m)) == NULL)
  182                 goto bad;
  183         if (in6_setscope(nextaddr, ifa->ia_ifp, NULL) != 0) {
  184                 ip6stat.ip6s_badscope++;
  185                 goto bad;
  186         }
  187 
  188         /*
  189          * Swap the IPv6 destination address and nextaddr. Forward the packet.
  190          */
  191         tmpaddr = *nextaddr;
  192         *nextaddr = ip6->ip6_dst;
  193         in6_clearscope(nextaddr); /* XXX */
  194         ip6->ip6_dst = tmpaddr;
  195 
  196 #ifdef COMPAT_RFC1883
  197         if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8))))
  198                 ip6_forward(m, IPV6_SRCRT_NEIGHBOR);
  199         else
  200                 ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR);
  201 #else
  202         ip6_forward(m, 1);
  203 #endif
  204 
  205         return (-1);                    /* m would be freed in ip6_forward() */
  206 
  207   bad:
  208         m_freem(m);
  209         return (-1);
  210 }

Cache object: 55ee7755159cbd75eeaba6ad7b4910ca


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