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/11.2/sys/netinet6/dest6.c 332820 2018-04-20 14:34:04Z jtl $");
   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/if_var.h>
   51 #include <net/route.h>
   52 
   53 #include <netinet/in.h>
   54 #include <netinet/in_var.h>
   55 #include <netinet/ip6.h>
   56 #include <netinet6/ip6_var.h>
   57 #include <netinet/icmp6.h>
   58 
   59 /*
   60  * Destination options header processing.
   61  */
   62 int
   63 dest6_input(struct mbuf **mp, int *offp, int proto)
   64 {
   65         struct mbuf *m = *mp;
   66         int off = *offp, dstoptlen, optlen;
   67         struct ip6_dest *dstopts;
   68         u_int8_t *opt;
   69 
   70         /* validation of the length of the header */
   71 #ifndef PULLDOWN_TEST
   72         IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE);
   73         dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
   74 #else
   75         IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
   76         if (dstopts == NULL)
   77                 return IPPROTO_DONE;
   78 #endif
   79         dstoptlen = (dstopts->ip6d_len + 1) << 3;
   80 
   81 #ifndef PULLDOWN_TEST
   82         IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE);
   83         dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
   84 #else
   85         IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
   86         if (dstopts == NULL)
   87                 return IPPROTO_DONE;
   88 #endif
   89         off += dstoptlen;
   90         dstoptlen -= sizeof(struct ip6_dest);
   91         opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
   92 
   93         /* search header for all options. */
   94         for (; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
   95                 if (*opt != IP6OPT_PAD1 &&
   96                     (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
   97                         IP6STAT_INC(ip6s_toosmall);
   98                         goto bad;
   99                 }
  100 
  101                 switch (*opt) {
  102                 case IP6OPT_PAD1:
  103                         optlen = 1;
  104                         break;
  105                 case IP6OPT_PADN:
  106                         optlen = *(opt + 1) + 2;
  107                         break;
  108                 default:                /* unknown option */
  109                         optlen = ip6_unknown_opt(opt, m,
  110                             opt - mtod(m, u_int8_t *));
  111                         if (optlen == -1)
  112                                 return (IPPROTO_DONE);
  113                         optlen += 2;
  114                         break;
  115                 }
  116         }
  117 
  118         *offp = off;
  119         return (dstopts->ip6d_nxt);
  120 
  121   bad:
  122         m_freem(m);
  123         return (IPPROTO_DONE);
  124 }

Cache object: 127e9756ba061b2cb5002b49bae81743

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

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