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dest6.c revision 1.5 
      1 /*	$NetBSD: dest6.c,v 1.5 1999/12/13 15:17:21 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 <netinet6/ip6.h>
     49 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined(__OpenBSD__)
     50 #include <netinet6/in6_pcb.h>
     51 #endif
     52 #include <netinet6/ip6_var.h>
     53 #include <netinet6/icmp6.h>
     54 
     55 /*
     56  * Destination options header processing.
     57  */
     58 int
     59 dest6_input(mp, offp, proto)
     60 	struct mbuf **mp;
     61 	int *offp, proto;
     62 {
     63 	register struct mbuf *m = *mp;
     64 	int off = *offp, dstoptlen, optlen;
     65 	struct ip6_dest *dstopts;
     66 	u_int8_t *opt;
     67 
     68 	/* validation of the length of the header */
     69 #ifndef PULLDOWN_TEST
     70 	IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE);
     71 	dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
     72 #else
     73 	IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
     74 	if (dstopts == NULL)
     75 		return IPPROTO_DONE;
     76 #endif
     77 	dstoptlen = (dstopts->ip6d_len + 1) << 3;
     78 
     79 #ifndef PULLDOWN_TEST
     80 	IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE);
     81 	dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
     82 #else
     83 	IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
     84 	if (dstopts == NULL)
     85 		return IPPROTO_DONE;
     86 #endif
     87 	off += dstoptlen;
     88 	dstoptlen -= sizeof(struct ip6_dest);
     89 	opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
     90 
     91 	/* search header for all options. */
     92 	for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
     93 		switch(*opt) {
     94 		 case IP6OPT_PAD1:
     95 			 optlen = 1;
     96 			 break;
     97 		 case IP6OPT_PADN:
     98 			 if (dstoptlen < IP6OPT_MINLEN) {
     99 				 ip6stat.ip6s_toosmall++;
    100 				 goto bad;
    101 			 }
    102 			 optlen = *(opt + 1) + 2;
    103 			 break;
    104 		 default:		/* unknown option */
    105 			 if (dstoptlen < IP6OPT_MINLEN) {
    106 				 ip6stat.ip6s_toosmall++;
    107 				 goto bad;
    108 			 }
    109 			 if ((optlen = ip6_unknown_opt(opt, m,
    110 						       opt-mtod(m, u_int8_t *))) == -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 }
    124