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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the project nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      $KAME: route6.c,v 1.24 2001/03/14 03:07:05 itojun Exp $
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: releng/12.0/sys/netinet6/route6.c 326023 2017-11-20 19:43:44Z pfg $");
   36 
   37 #include "opt_inet.h"
   38 #include "opt_inet6.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/mbuf.h>
   42 #include <sys/socket.h>
   43 #include <sys/systm.h>
   44 #include <sys/queue.h>
   45 
   46 #include <net/if.h>
   47 #include <net/if_var.h>
   48 
   49 #include <netinet/in.h>
   50 #include <netinet6/in6_var.h>
   51 #include <netinet/ip6.h>
   52 #include <netinet6/ip6_var.h>
   53 #include <netinet6/scope6_var.h>
   54 
   55 #include <netinet/icmp6.h>
   56 
   57 /*
   58  * proto - is unused
   59  */
   60 
   61 int
   62 route6_input(struct mbuf **mp, int *offp, int proto)
   63 {
   64         struct ip6_hdr *ip6;
   65         struct mbuf *m = *mp;
   66         struct ip6_rthdr *rh;
   67         int off = *offp, rhlen;
   68 #ifdef __notyet__
   69         struct ip6aux *ip6a;
   70 
   71         ip6a = ip6_findaux(m);
   72         if (ip6a) {
   73                 /* XXX reject home-address option before rthdr */
   74                 if (ip6a->ip6a_flags & IP6A_SWAP) {
   75                         IP6STAT_INC(ip6s_badoptions);
   76                         m_freem(m);
   77                         return IPPROTO_DONE;
   78                 }
   79         }
   80 #endif
   81 
   82 #ifndef PULLDOWN_TEST
   83         IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE);
   84         ip6 = mtod(m, struct ip6_hdr *);
   85         rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
   86 #else
   87         ip6 = mtod(m, struct ip6_hdr *);
   88         IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
   89         if (rh == NULL) {
   90                 IP6STAT_INC(ip6s_tooshort);
   91                 return IPPROTO_DONE;
   92         }
   93 #endif
   94 
   95         /*
   96          * While this switch may look gratuitous, leave it in
   97          * in favour of RH2 implementations, etc.
   98          */
   99         switch (rh->ip6r_type) {
  100         default:
  101                 /* Unknown routing header type. */
  102                 if (rh->ip6r_segleft == 0) {
  103                         rhlen = (rh->ip6r_len + 1) << 3;
  104                         break;  /* Final dst. Just ignore the header. */
  105                 }
  106                 IP6STAT_INC(ip6s_badoptions);
  107                 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
  108                             (caddr_t)&rh->ip6r_type - (caddr_t)ip6);
  109                 return (IPPROTO_DONE);
  110         }
  111 
  112         *offp += rhlen;
  113         return (rh->ip6r_nxt);
  114 }

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