dest6.c

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    1 /*      $NetBSD: dest6.c,v 1.17 2008/04/15 03:57:04 thorpej Exp $       */
    2 /*      $KAME: dest6.c,v 1.25 2001/02/22 01:39:16 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/cdefs.h>
   34 __KERNEL_RCSID(0, "$NetBSD: dest6.c,v 1.17 2008/04/15 03:57:04 thorpej Exp $");
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/malloc.h>
   39 #include <sys/mbuf.h>
   40 #include <sys/domain.h>
   41 #include <sys/protosw.h>
   42 #include <sys/socket.h>
   43 #include <sys/errno.h>
   44 #include <sys/time.h>
   45 #include <sys/kernel.h>
   46 
   47 #include <net/if.h>
   48 #include <net/route.h>
   49 
   50 #include <netinet/in.h>
   51 #include <netinet/in_var.h>
   52 #include <netinet/ip6.h>
   53 #include <netinet6/ip6_var.h>
   54 #include <netinet6/ip6_private.h>
   55 #include <netinet/icmp6.h>
   56 
   57 /*
   58  * Destination options header processing.
   59  */
   60 int
   61 dest6_input(struct mbuf **mp, int *offp, int proto)
   62 {
   63         struct mbuf *m = *mp;
   64         int off = *offp, dstoptlen, optlen;
   65         struct ip6_dest *dstopts;
   66         u_int8_t *opt;
   67 
   68         /* validation of the length of the header */
   69         IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
   70         if (dstopts == NULL)
   71                 return IPPROTO_DONE;
   72         dstoptlen = (dstopts->ip6d_len + 1) << 3;
   73 
   74         IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
   75         if (dstopts == NULL)
   76                 return IPPROTO_DONE;
   77         off += dstoptlen;
   78         dstoptlen -= sizeof(struct ip6_dest);
   79         opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
   80 
   81         /* search header for all options. */
   82         for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
   83                 if (*opt != IP6OPT_PAD1 &&
   84                     (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
   85                         IP6_STATINC(IP6_STAT_TOOSMALL);
   86                         goto bad;
   87                 }
   88 
   89                 switch (*opt) {
   90                 case IP6OPT_PAD1:
   91                         optlen = 1;
   92                         break;
   93                 case IP6OPT_PADN:
   94                         optlen = *(opt + 1) + 2;
   95                         break;
   96                 default:                /* unknown option */
   97                         optlen = ip6_unknown_opt(opt, m,
   98                             opt - mtod(m, u_int8_t *));
   99                         if (optlen == -1)
  100                                 return (IPPROTO_DONE);
  101                         optlen += 2;
  102                         break;
  103                 }
  104         }
  105 
  106         *offp = off;
  107         return (dstopts->ip6d_nxt);
  108 
  109   bad:
  110         m_freem(m);
  111         return (IPPROTO_DONE);
  112 }

Cache object: 20362ff631b004fc4b2b32cdc5d8c176

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FreeBSD/Linux Kernel Cross Reference sys/netinet6/dest6.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet6/dest6.c