Line data    Source code

       1             : /*      $OpenBSD: route6.c,v 1.21 2017/04/14 20:46:31 bluhm 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/param.h>
      34             : #include <sys/mbuf.h>
      35             : #include <sys/socket.h>
      36             : #include <sys/systm.h>
      37             : 
      38             : #include <net/if.h>
      39             : #include <net/if_var.h>
      40             : 
      41             : #include <netinet/in.h>
      42             : #include <netinet6/in6_var.h>
      43             : #include <netinet/ip6.h>
      44             : #include <netinet6/ip6_var.h>
      45             : 
      46             : #include <netinet/icmp6.h>
      47             : 
      48             : /*
      49             :  * proto is unused
      50             :  */
      51             : 
      52             : int
      53           0 : route6_input(struct mbuf **mp, int *offp, int proto, int af)
      54             : {
      55             :         struct ip6_hdr *ip6;
      56           0 :         struct mbuf *m = *mp;
      57             :         struct ip6_rthdr *rh;
      58           0 :         int off = *offp, rhlen;
      59             : 
      60           0 :         ip6 = mtod(m, struct ip6_hdr *);
      61           0 :         IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
      62           0 :         if (rh == NULL) {
      63           0 :                 ip6stat_inc(ip6s_tooshort);
      64           0 :                 return IPPROTO_DONE;
      65             :         }
      66             : 
      67           0 :         switch (rh->ip6r_type) {
      68             :         case IPV6_RTHDR_TYPE_0:
      69             :                 /*
      70             :                  * RFC 5095 specifies to handle routing header type 0
      71             :                  * the same way as an unrecognised routing type.
      72             :                  */
      73             :                 /* FALLTHROUGH */
      74             :         default:
      75             :                 /* unknown routing type */
      76           0 :                 if (rh->ip6r_segleft == 0) {
      77           0 :                         rhlen = (rh->ip6r_len + 1) << 3;
      78             :                         break;  /* Final dst. Just ignore the header. */
      79             :                 }
      80           0 :                 ip6stat_inc(ip6s_badoptions);
      81           0 :                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
      82           0 :                             (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
      83           0 :                 return (IPPROTO_DONE);
      84             :         }
      85             : 
      86           0 :         *offp += rhlen;
      87           0 :         return (rh->ip6r_nxt);
      88           0 : }