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dest6.c revision 1.3 
      1 /*	$NetBSD: dest6.c,v 1.3 1999/07/03 21:30:17 thorpej 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/in6_systm.h>
     49 #include <netinet6/ip6.h>
     50 #if !defined(__FreeBSD__) || __FreeBSD__ < 3
     51 #include <netinet6/in6_pcb.h>
     52 #endif
     53 #include <netinet6/ip6_var.h>
     54 #include <netinet6/icmp6.h>
     55 
     56 /*
     57  * Destination options header processing.
     58  */
     59 int
     60 dest6_input(mp, offp, proto)
     61 	struct mbuf **mp;
     62 	int *offp, proto;
     63 {
     64 	register struct mbuf *m = *mp;
     65 	int off = *offp, dstoptlen, optlen;
     66 	struct ip6_dest *dstopts;
     67 	u_int8_t *opt;
     68 
     69 	/* validation of the length of the header */
     70 	IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE);
     71 	dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
     72 	dstoptlen = (dstopts->ip6d_len + 1) << 3;
     73 
     74 	IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE);
     75 	dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
     76 	off += dstoptlen;
     77 	dstoptlen -= sizeof(struct ip6_dest);
     78 	opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
     79 
     80 	/* search header for all options. */
     81 	for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
     82 		switch(*opt) {
     83 		 case IP6OPT_PAD1:
     84 			 optlen = 1;
     85 			 break;
     86 		 case IP6OPT_PADN:
     87 			 if (dstoptlen < IP6OPT_MINLEN) {
     88 				 ip6stat.ip6s_toosmall++;
     89 				 goto bad;
     90 			 }
     91 			 optlen = *(opt + 1) + 2;
     92 			 break;
     93 		 default:		/* unknown option */
     94 			 if (dstoptlen < IP6OPT_MINLEN) {
     95 				 ip6stat.ip6s_toosmall++;
     96 				 goto bad;
     97 			 }
     98 			 if ((optlen = ip6_unknown_opt(opt, m,
     99 						       opt-mtod(m, u_int8_t *))) == -1)
    100 				 return(IPPROTO_DONE);
    101 			 optlen += 2;
    102 			 break;
    103 		}
    104 	}
    105 
    106 	*offp = off;
    107 	return(dstopts->ip6d_nxt);
    108 
    109   bad:
    110 	m_freem(m);
    111 	return(IPPROTO_DONE);
    112 }
    113