route6.c

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    1 /*      $OpenBSD: route6.c,v 1.21 2017/04/14 20:46:31 bluhm Exp $       */
    2 /*      $KAME: route6.c,v 1.22 2000/12/03 00:54:00 itojun Exp $ */
    3 
    4 /*
    5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/param.h>
   34 #include <sys/mbuf.h>
   35 #include <sys/socket.h>
   36 #include <sys/systm.h>
   37 
   38 #include <net/if.h>
   39 #include <net/if_var.h>
   40 
   41 #include <netinet/in.h>
   42 #include <netinet6/in6_var.h>
   43 #include <netinet/ip6.h>
   44 #include <netinet6/ip6_var.h>
   45 
   46 #include <netinet/icmp6.h>
   47 
   48 /*
   49  * proto is unused
   50  */
   51 
   52 int
   53 route6_input(struct mbuf **mp, int *offp, int proto, int af)
   54 {
   55         struct ip6_hdr *ip6;
   56         struct mbuf *m = *mp;
   57         struct ip6_rthdr *rh;
   58         int off = *offp, rhlen;
   59 
   60         ip6 = mtod(m, struct ip6_hdr *);
   61         IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
   62         if (rh == NULL) {
   63                 ip6stat_inc(ip6s_tooshort);
   64                 return IPPROTO_DONE;
   65         }
   66 
   67         switch (rh->ip6r_type) {
   68         case IPV6_RTHDR_TYPE_0:
   69                 /*
   70                  * RFC 5095 specifies to handle routing header type 0
   71                  * the same way as an unrecognised routing type.
   72                  */
   73                 /* FALLTHROUGH */
   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_inc(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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FreeBSD/Linux Kernel Cross Reference sys/netinet6/route6.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet6/route6.c