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: releng/10.0/sys/netinet6/route6.c 249294 2013-04-09 07:11:22Z ae $");
   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 /*
   55  * proto - is unused
   56  */
   57 
   58 int
   59 route6_input(struct mbuf **mp, int *offp, int proto)
   60 {
   61         struct ip6_hdr *ip6;
   62         struct mbuf *m = *mp;
   63         struct ip6_rthdr *rh;
   64         int off = *offp, rhlen;
   65 #ifdef __notyet__
   66         struct ip6aux *ip6a;
   67 
   68         ip6a = ip6_findaux(m);
   69         if (ip6a) {
   70                 /* XXX reject home-address option before rthdr */
   71                 if (ip6a->ip6a_flags & IP6A_SWAP) {
   72                         IP6STAT_INC(ip6s_badoptions);
   73                         m_freem(m);
   74                         return IPPROTO_DONE;
   75                 }
   76         }
   77 #endif
   78 
   79 #ifndef PULLDOWN_TEST
   80         IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
   81         ip6 = mtod(m, struct ip6_hdr *);
   82         rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
   83 #else
   84         ip6 = mtod(m, struct ip6_hdr *);
   85         IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
   86         if (rh == NULL) {
   87                 IP6STAT_INC(ip6s_tooshort);
   88                 return IPPROTO_DONE;
   89         }
   90 #endif
   91 
   92         /*
   93          * While this switch may look gratuitous, leave it in
   94          * in favour of RH2 implementations, etc.
   95          */
   96         switch (rh->ip6r_type) {
   97         default:
   98                 /* Unknown routing header type. */
   99                 if (rh->ip6r_segleft == 0) {
  100                         rhlen = (rh->ip6r_len + 1) << 3;
  101                         break;  /* Final dst. Just ignore the header. */
  102                 }
  103                 IP6STAT_INC(ip6s_badoptions);
  104                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
  105                             (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
  106                 return (IPPROTO_DONE);
  107         }
  108 
  109         *offp += rhlen;
  110         return (rh->ip6r_nxt);
  111 }

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