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 /*      $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 }

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