sys/netinet6/route6.c

   1 /*      $FreeBSD: src/sys/netinet6/route6.c,v 1.1.2.5 2003/01/23 21:06:47 sam Exp $     */
   2 /*      $DragonFly: src/sys/netinet6/route6.c,v 1.10 2008/09/04 09:08:22 hasso Exp $    */
   3 /*      $KAME: route6.c,v 1.24 2001/03/14 03:07:05 itojun Exp $ */
   4
   5 /*
   6  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the project nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "opt_inet.h"
  35 #include "opt_inet6.h"
  36
  37 #include <sys/param.h>
  38 #include <sys/mbuf.h>
  39 #include <sys/socket.h>
  40 #include <sys/systm.h>
  41 #include <sys/queue.h>
  42
  43 #include <net/if.h>
  44
  45 #include <netinet/in.h>
  46 #include <netinet6/in6_var.h>
  47 #include <netinet/ip6.h>
  48 #include <netinet6/ip6_var.h>
  49
  50 #include <netinet/icmp6.h>
  51
  52 int
  53 route6_input(struct mbuf **mp, int *offp, int proto) /* proto is unused */
  54 {
  55         struct ip6_hdr *ip6;
  56         struct mbuf *m = *mp;
  57         struct ip6_rthdr *rh;
  58         int off = *offp, rhlen;
  59
  60 #ifndef PULLDOWN_TEST
  61         IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
  62         ip6 = mtod(m, struct ip6_hdr *);
  63         rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
  64 #else
  65         ip6 = mtod(m, struct ip6_hdr *);
  66         IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
  67         if (rh == NULL) {
  68                 ip6stat.ip6s_tooshort++;
  69                 return IPPROTO_DONE;
  70         }
  71 #endif
  72
  73         switch (rh->ip6r_type) {
  74         default:
  75                 /* unknown routing type */
  76                 if (rh->ip6r_segleft == 0) {
  77                         rhlen = (rh->ip6r_len + 1) << 3;
  78                         break;  /* Final dst. Just ignore the header. */
  79                 }
  80                 ip6stat.ip6s_badoptions++;
  81                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
  82                             (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
  83                 return (IPPROTO_DONE);
  84         }
  85
  86         *offp += rhlen;
  87         return (rh->ip6r_nxt);
  88 }