dest6.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the project nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      $KAME: dest6.c,v 1.59 2003/07/11 13:21:16 t-momose Exp $
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD$");
   36 
   37 #include "opt_inet.h"
   38 #include "opt_inet6.h"
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/malloc.h>
   43 #include <sys/mbuf.h>
   44 #include <sys/domain.h>
   45 #include <sys/protosw.h>
   46 #include <sys/socket.h>
   47 #include <sys/errno.h>
   48 #include <sys/time.h>
   49 #include <sys/kernel.h>
   50 
   51 #include <net/if.h>
   52 #include <net/if_var.h>
   53 #include <net/route.h>
   54 
   55 #include <netinet/in.h>
   56 #include <netinet/in_var.h>
   57 #include <netinet/ip6.h>
   58 #include <netinet6/ip6_var.h>
   59 #include <netinet/icmp6.h>
   60 
   61 /*
   62  * Destination options header processing.
   63  */
   64 int
   65 dest6_input(struct mbuf **mp, int *offp, int proto)
   66 {
   67         struct mbuf *m;
   68         int off, dstoptlen, optlen;
   69         struct ip6_dest *dstopts;
   70         u_int8_t *opt;
   71 
   72         m = *mp;
   73         off = *offp;
   74 
   75         /* Validation of the length of the header. */
   76         if (m->m_len < off + sizeof(*dstopts)) {
   77                 m = m_pullup(m, off + sizeof(*dstopts));
   78                 if (m == NULL) {
   79                         IP6STAT_INC(ip6s_exthdrtoolong);
   80                         *mp = m;
   81                         return (IPPROTO_DONE);
   82                 }
   83         }
   84         dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
   85         dstoptlen = (dstopts->ip6d_len + 1) << 3;
   86 
   87         if (m->m_len < off + dstoptlen) {
   88                 m = m_pullup(m, off + dstoptlen);
   89                 if (m == NULL) {
   90                         IP6STAT_INC(ip6s_exthdrtoolong);
   91                         *mp = m;
   92                         return (IPPROTO_DONE);
   93                 }
   94         }
   95         dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
   96         off += dstoptlen;
   97         dstoptlen -= sizeof(struct ip6_dest);
   98         opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
   99 
  100         /* search header for all options. */
  101         for (; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
  102                 if (*opt != IP6OPT_PAD1 &&
  103                     (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
  104                         IP6STAT_INC(ip6s_toosmall);
  105                         goto bad;
  106                 }
  107 
  108                 switch (*opt) {
  109                 case IP6OPT_PAD1:
  110                         optlen = 1;
  111                         break;
  112                 case IP6OPT_PADN:
  113                         optlen = *(opt + 1) + 2;
  114                         break;
  115                 default:                /* unknown option */
  116                         optlen = ip6_unknown_opt(opt, m,
  117                             opt - mtod(m, u_int8_t *));
  118                         if (optlen == -1) {
  119                                 *mp = NULL;
  120                                 return (IPPROTO_DONE);
  121                         }
  122                         optlen += 2;
  123                         break;
  124                 }
  125         }
  126 
  127         *offp = off;
  128         *mp = m;
  129         return (dstopts->ip6d_nxt);
  130 
  131   bad:
  132         m_freem(m);
  133         *mp = NULL;
  134         return (IPPROTO_DONE);
  135 }

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

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