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 /*-
    2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $KAME: dest6.c,v 1.59 2003/07/11 13:21:16 t-momose Exp $
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/8.3/sys/netinet6/dest6.c 196019 2009-08-01 19:26:27Z rwatson $");
   34 
   35 #include "opt_inet.h"
   36 #include "opt_inet6.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/malloc.h>
   41 #include <sys/mbuf.h>
   42 #include <sys/domain.h>
   43 #include <sys/protosw.h>
   44 #include <sys/socket.h>
   45 #include <sys/errno.h>
   46 #include <sys/time.h>
   47 #include <sys/kernel.h>
   48 
   49 #include <net/if.h>
   50 #include <net/route.h>
   51 
   52 #include <netinet/in.h>
   53 #include <netinet/in_var.h>
   54 #include <netinet/ip6.h>
   55 #include <netinet6/ip6_var.h>
   56 #include <netinet/icmp6.h>
   57 
   58 /*
   59  * Destination options header processing.
   60  */
   61 int
   62 dest6_input(struct mbuf **mp, int *offp, int proto)
   63 {
   64         struct mbuf *m = *mp;
   65         int off = *offp, dstoptlen, optlen;
   66         struct ip6_dest *dstopts;
   67         u_int8_t *opt;
   68 
   69         /* validation of the length of the header */
   70 #ifndef PULLDOWN_TEST
   71         IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE);
   72         dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
   73 #else
   74         IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
   75         if (dstopts == NULL)
   76                 return IPPROTO_DONE;
   77 #endif
   78         dstoptlen = (dstopts->ip6d_len + 1) << 3;
   79 
   80 #ifndef PULLDOWN_TEST
   81         IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE);
   82         dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
   83 #else
   84         IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
   85         if (dstopts == NULL)
   86                 return IPPROTO_DONE;
   87 #endif
   88         off += dstoptlen;
   89         dstoptlen -= sizeof(struct ip6_dest);
   90         opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
   91 
   92         /* search header for all options. */
   93         for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
   94                 if (*opt != IP6OPT_PAD1 &&
   95                     (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
   96                         V_ip6stat.ip6s_toosmall++;
   97                         goto bad;
   98                 }
   99 
  100                 switch (*opt) {
  101                 case IP6OPT_PAD1:
  102                         optlen = 1;
  103                         break;
  104                 case IP6OPT_PADN:
  105                         optlen = *(opt + 1) + 2;
  106                         break;
  107                 default:                /* unknown option */
  108                         optlen = ip6_unknown_opt(opt, m,
  109                             opt - mtod(m, u_int8_t *));
  110                         if (optlen == -1)
  111                                 return (IPPROTO_DONE);
  112                         optlen += 2;
  113                         break;
  114                 }
  115         }
  116 
  117         *offp = off;
  118         return (dstopts->ip6d_nxt);
  119 
  120   bad:
  121         m_freem(m);
  122         return (IPPROTO_DONE);
  123 }

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