bsd/netinet6/dest6.c

   1 /*      $KAME: dest6.c,v 1.10 2000/02/28 16:18:11 itojun Exp $  */
   2
   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
  32 #include <sys/param.h>
  33 #include <sys/systm.h>
  34 #include <sys/malloc.h>
  35 #include <sys/mbuf.h>
  36 #include <sys/domain.h>
  37 #include <sys/protosw.h>
  38 #include <sys/socket.h>
  39 #include <sys/errno.h>
  40 #include <sys/time.h>
  41 #include <sys/kernel.h>
  42
  43 #include <net/if.h>
  44 #include <net/route.h>
  45
  46 #include <netinet/in.h>
  47 #include <netinet/in_var.h>
  48 #include <netinet/ip6.h>
  49 #include <netinet6/ip6_var.h>
  50 #if !(defined(__APPLE__))
  51 #include <netinet6/in6_pcb.h>
  52 #endif
  53 #include <netinet/icmp6.h>
  54
  55 #if MIP6
  56 int (*mip6_store_dstopt_pre_hook)(struct mbuf *m, u_int8_t *opt,
  57                                   u_int8_t off, u_int8_t dstlen) = NULL;
  58 int (*mip6_rec_ctrl_sig_hook)(struct mbuf *m, int off) = NULL;
  59 #endif /* MIP6 */
  60
  61 /*
  62  * Destination options header processing.
  63  */
  64 int
  65 dest6_input(mp, offp, proto)
  66         struct mbuf **mp;
  67         int *offp, proto;
  68 {
  69         register struct mbuf *m = *mp;
  70         int off = *offp, dstoptlen, optlen;
  71         struct ip6_dest *dstopts;
  72         u_int8_t *opt;
  73
  74         /* validation of the length of the header */
  75 #ifndef PULLDOWN_TEST
  76         IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE);
  77         dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
  78 #else
  79         IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
  80         if (dstopts == NULL)
  81                 return IPPROTO_DONE;
  82 #endif
  83         dstoptlen = (dstopts->ip6d_len + 1) << 3;
  84
  85 #ifndef PULLDOWN_TEST
  86         IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE);
  87         dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
  88 #else
  89         IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
  90         if (dstopts == NULL)
  91                 return IPPROTO_DONE;
  92 #endif
  93         off += dstoptlen;
  94         dstoptlen -= sizeof(struct ip6_dest);
  95         opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
  96
  97         /* search header for all options. */
  98         for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
  99                 switch(*opt) {
 100                  case IP6OPT_PAD1:
 101                          optlen = 1;
 102                          break;
 103                  case IP6OPT_PADN:
 104                          if (dstoptlen < IP6OPT_MINLEN) {
 105                                  ip6stat.ip6s_toosmall++;
 106                                  goto bad;
 107                          }
 108                          optlen = *(opt + 1) + 2;
 109                          break;
 110
 111 #if MIP6
 112                  case IP6OPT_BINDING_UPDATE:
 113                  case IP6OPT_BINDING_ACK:
 114                  case IP6OPT_BINDING_REQ:
 115                  case IP6OPT_HOME_ADDRESS:
 116                         if (mip6_store_dstopt_pre_hook) {
 117                                 if ((*mip6_store_dstopt_pre_hook)(m, opt, off, dstoptlen) != 0)
 118                                         goto bad;
 119                         }
 120                         optlen = *(opt + 1) + 2;
 121                         break;
 122 #endif /* MIP6 */
 123
 124                  default:               /* unknown option */
 125                          if (dstoptlen < IP6OPT_MINLEN) {
 126                                  ip6stat.ip6s_toosmall++;
 127                                  goto bad;
 128                          }
 129                          if ((optlen = ip6_unknown_opt(opt, m,
 130                                                        opt-mtod(m, u_int8_t *))) == -1)
 131                                  return(IPPROTO_DONE);
 132                          optlen += 2;
 133                          break;
 134                 }
 135         }
 136
 137 #if MIP6
 138         if (mip6_rec_ctrl_sig_hook) {
 139                 /*
 140                  * All Destinations options have been processed. Call MIPv6 to
 141                  * process stored options.
 142                  */
 143                 if ((*mip6_rec_ctrl_sig_hook)(m, *offp) != 0)
 144                         return(IPPROTO_DONE);
 145         }
 146 #endif /* MIP6 */
 147
 148         *offp = off;
 149         return(dstopts->ip6d_nxt);
 150
 151   bad:
 152         m_freem(m);
 153         return(IPPROTO_DONE);
 154 }