dest6.c

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    1 /*      $OpenBSD: dest6.c,v 1.19 2022/06/29 22:45:24 bluhm 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/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/mbuf.h>
   36 #include <sys/socket.h>
   37 #include <sys/errno.h>
   38 #include <sys/time.h>
   39 #include <sys/kernel.h>
   40 
   41 #include <netinet/in.h>
   42 #include <netinet/ip6.h>
   43 #include <netinet6/ip6_var.h>
   44 #include <netinet/icmp6.h>
   45 
   46 /*
   47  * Destination options header processing.
   48  */
   49 int
   50 dest6_input(struct mbuf **mp, int *offp, int proto, int af)
   51 {
   52         int off = *offp, dstoptlen, optlen;
   53         struct ip6_dest *dstopts;
   54         u_int8_t *opt;
   55 
   56         /* validation of the length of the header */
   57         IP6_EXTHDR_GET(dstopts, struct ip6_dest *, *mp, off, sizeof(*dstopts));
   58         if (dstopts == NULL)
   59                 return IPPROTO_DONE;
   60         dstoptlen = (dstopts->ip6d_len + 1) << 3;
   61 
   62         IP6_EXTHDR_GET(dstopts, struct ip6_dest *, *mp, off, dstoptlen);
   63         if (dstopts == NULL)
   64                 return IPPROTO_DONE;
   65         off += dstoptlen;
   66         dstoptlen -= sizeof(struct ip6_dest);
   67         opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
   68 
   69         /* search header for all options. */
   70         for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
   71                 if (*opt != IP6OPT_PAD1 &&
   72                     (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
   73                         ip6stat_inc(ip6s_toosmall);
   74                         goto bad;
   75                 }
   76 
   77                 switch (*opt) {
   78                 case IP6OPT_PAD1:
   79                         optlen = 1;
   80                         break;
   81                 case IP6OPT_PADN:
   82                         optlen = *(opt + 1) + 2;
   83                         break;
   84                 default:                /* unknown option */
   85                         optlen = ip6_unknown_opt(mp, opt,
   86                             opt - mtod(*mp, u_int8_t *));
   87                         if (optlen == -1)
   88                                 return (IPPROTO_DONE);
   89                         optlen += 2;
   90                         break;
   91                 }
   92         }
   93 
   94         *offp = off;
   95         return (dstopts->ip6d_nxt);
   96 
   97   bad:
   98         m_freemp(mp);
   99         return (IPPROTO_DONE);
  100 }

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

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