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/11.2/sys/netinet6/route6.c 331722 2018-03-29 02:50:57Z eadler $");
   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 #include <net/if_var.h>
   46 
   47 #include <netinet/in.h>
   48 #include <netinet6/in6_var.h>
   49 #include <netinet/ip6.h>
   50 #include <netinet6/ip6_var.h>
   51 #include <netinet6/scope6_var.h>
   52 
   53 #include <netinet/icmp6.h>
   54 
   55 /*
   56  * proto - is unused
   57  */
   58 
   59 int
   60 route6_input(struct mbuf **mp, int *offp, int proto)
   61 {
   62         struct ip6_hdr *ip6;
   63         struct mbuf *m = *mp;
   64         struct ip6_rthdr *rh;
   65         int off = *offp, rhlen;
   66 #ifdef __notyet__
   67         struct ip6aux *ip6a;
   68 
   69         ip6a = ip6_findaux(m);
   70         if (ip6a) {
   71                 /* XXX reject home-address option before rthdr */
   72                 if (ip6a->ip6a_flags & IP6A_SWAP) {
   73                         IP6STAT_INC(ip6s_badoptions);
   74                         m_freem(m);
   75                         return IPPROTO_DONE;
   76                 }
   77         }
   78 #endif
   79 
   80 #ifndef PULLDOWN_TEST
   81         IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
   82         ip6 = mtod(m, struct ip6_hdr *);
   83         rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
   84 #else
   85         ip6 = mtod(m, struct ip6_hdr *);
   86         IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
   87         if (rh == NULL) {
   88                 IP6STAT_INC(ip6s_tooshort);
   89                 return IPPROTO_DONE;
   90         }
   91 #endif
   92 
   93         /*
   94          * While this switch may look gratuitous, leave it in
   95          * in favour of RH2 implementations, etc.
   96          */
   97         switch (rh->ip6r_type) {
   98         default:
   99                 /* Unknown routing header type. */
  100                 if (rh->ip6r_segleft == 0) {
  101                         rhlen = (rh->ip6r_len + 1) << 3;
  102                         break;  /* Final dst. Just ignore the header. */
  103                 }
  104                 IP6STAT_INC(ip6s_badoptions);
  105                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
  106                             (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
  107                 return (IPPROTO_DONE);
  108         }
  109 
  110         *offp += rhlen;
  111         return (rh->ip6r_nxt);
  112 }

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