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/dest6.c

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    1 /*      $FreeBSD: stable/4/sys/netinet6/dest6.c 95609 2002-04-28 05:40:29Z suz $        */
    2 /*      $KAME: dest6.c,v 1.34 2002/01/08 02:40:55 k-sugyou 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 "opt_inet.h"
   34 #include "opt_inet6.h"
   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 <netinet/icmp6.h>
   55 
   56 /*
   57  * Destination options header processing.
   58  */
   59 int
   60 dest6_input(mp, offp, proto)
   61         struct mbuf **mp;
   62         int *offp, proto;
   63 {
   64         struct mbuf *m = *mp;
   65         int off = *offp, dstoptlen, optlen;
   66         struct ip6_dest *dstopts;
   67         u_int8_t *opt;
   68         struct ip6_hdr *ip6;
   69 
   70         ip6 = mtod(m, struct ip6_hdr *);
   71 
   72         /* validation of the length of the header */
   73 #ifndef PULLDOWN_TEST
   74         IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE);
   75         dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
   76 #else
   77         IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
   78         if (dstopts == NULL)
   79                 return IPPROTO_DONE;
   80 #endif
   81         dstoptlen = (dstopts->ip6d_len + 1) << 3;
   82 
   83 #ifndef PULLDOWN_TEST
   84         IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE);
   85         dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
   86 #else
   87         IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
   88         if (dstopts == NULL)
   89                 return IPPROTO_DONE;
   90 #endif
   91         off += dstoptlen;
   92         dstoptlen -= sizeof(struct ip6_dest);
   93         opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
   94 
   95         /* search header for all options. */
   96         for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
   97                 if (*opt != IP6OPT_PAD1 &&
   98                     (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
   99                         ip6stat.ip6s_toosmall++;
  100                         goto bad;
  101                 }
  102 
  103                 switch (*opt) {
  104                 case IP6OPT_PAD1:
  105                         optlen = 1;
  106                         break;
  107                 case IP6OPT_PADN:
  108                         optlen = *(opt + 1) + 2;
  109                         break;
  110 
  111                 default:                /* unknown option */
  112                         optlen = ip6_unknown_opt(opt, m,
  113                             opt - mtod(m, u_int8_t *));
  114                         if (optlen == -1)
  115                                 return (IPPROTO_DONE);
  116                         optlen += 2;
  117                         break;
  118                 }
  119         }
  120 
  121         *offp = off;
  122         return (dstopts->ip6d_nxt);
  123 
  124   bad:
  125         m_freem(m);
  126         return (IPPROTO_DONE);
  127 }

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