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dest6.c revision 1.18.2.1 
      1  1.18.2.1     skrll /*	$NetBSD: dest6.c,v 1.18.2.1 2016/05/29 08:44:39 skrll Exp $	*/
      2      1.10    itojun /*	$KAME: dest6.c,v 1.25 2001/02/22 01:39:16 itojun Exp $	*/
      3       1.3   thorpej 
      4       1.2    itojun /*
      5       1.2    itojun  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
      6       1.2    itojun  * All rights reserved.
      7       1.8    itojun  *
      8       1.2    itojun  * Redistribution and use in source and binary forms, with or without
      9       1.2    itojun  * modification, are permitted provided that the following conditions
     10       1.2    itojun  * are met:
     11       1.2    itojun  * 1. Redistributions of source code must retain the above copyright
     12       1.2    itojun  *    notice, this list of conditions and the following disclaimer.
     13       1.2    itojun  * 2. Redistributions in binary form must reproduce the above copyright
     14       1.2    itojun  *    notice, this list of conditions and the following disclaimer in the
     15       1.2    itojun  *    documentation and/or other materials provided with the distribution.
     16       1.2    itojun  * 3. Neither the name of the project nor the names of its contributors
     17       1.2    itojun  *    may be used to endorse or promote products derived from this software
     18       1.2    itojun  *    without specific prior written permission.
     19       1.8    itojun  *
     20       1.2    itojun  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     21       1.2    itojun  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22       1.2    itojun  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     23       1.2    itojun  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     24       1.2    itojun  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     25       1.2    itojun  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     26       1.2    itojun  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     27       1.2    itojun  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     28       1.2    itojun  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     29       1.2    itojun  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     30       1.2    itojun  * SUCH DAMAGE.
     31       1.2    itojun  */
     32      1.11     lukem 
     33      1.11     lukem #include <sys/cdefs.h>
     34  1.18.2.1     skrll __KERNEL_RCSID(0, "$NetBSD: dest6.c,v 1.18.2.1 2016/05/29 08:44:39 skrll Exp $");
     35       1.2    itojun 
     36       1.2    itojun #include <sys/param.h>
     37       1.2    itojun #include <sys/systm.h>
     38       1.2    itojun #include <sys/mbuf.h>
     39       1.2    itojun #include <sys/domain.h>
     40       1.2    itojun #include <sys/protosw.h>
     41       1.2    itojun #include <sys/socket.h>
     42       1.2    itojun #include <sys/errno.h>
     43       1.2    itojun #include <sys/time.h>
     44       1.2    itojun #include <sys/kernel.h>
     45       1.2    itojun 
     46       1.2    itojun #include <net/if.h>
     47       1.2    itojun 
     48       1.2    itojun #include <netinet/in.h>
     49       1.2    itojun #include <netinet/in_var.h>
     50       1.7    itojun #include <netinet/ip6.h>
     51       1.2    itojun #include <netinet6/ip6_var.h>
     52      1.17   thorpej #include <netinet6/ip6_private.h>
     53       1.7    itojun #include <netinet/icmp6.h>
     54       1.2    itojun 
     55       1.2    itojun /*
     56       1.2    itojun  * Destination options header processing.
     57       1.2    itojun  */
     58       1.2    itojun int
     59      1.15  christos dest6_input(struct mbuf **mp, int *offp, int proto)
     60       1.2    itojun {
     61       1.8    itojun 	struct mbuf *m = *mp;
     62       1.2    itojun 	int off = *offp, dstoptlen, optlen;
     63       1.2    itojun 	struct ip6_dest *dstopts;
     64       1.2    itojun 	u_int8_t *opt;
     65       1.2    itojun 
     66       1.2    itojun 	/* validation of the length of the header */
     67       1.5    itojun 	IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
     68       1.5    itojun 	if (dstopts == NULL)
     69       1.5    itojun 		return IPPROTO_DONE;
     70       1.2    itojun 	dstoptlen = (dstopts->ip6d_len + 1) << 3;
     71       1.2    itojun 
     72       1.5    itojun 	IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
     73       1.5    itojun 	if (dstopts == NULL)
     74       1.5    itojun 		return IPPROTO_DONE;
     75       1.2    itojun 	off += dstoptlen;
     76       1.2    itojun 	dstoptlen -= sizeof(struct ip6_dest);
     77       1.2    itojun 	opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
     78       1.2    itojun 
     79       1.2    itojun 	/* search header for all options. */
     80       1.2    itojun 	for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
     81      1.10    itojun 		if (*opt != IP6OPT_PAD1 &&
     82      1.10    itojun 		    (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
     83      1.17   thorpej 			IP6_STATINC(IP6_STAT_TOOSMALL);
     84       1.9    itojun 			goto bad;
     85       1.9    itojun 		}
     86       1.9    itojun 
     87       1.8    itojun 		switch (*opt) {
     88       1.8    itojun 		case IP6OPT_PAD1:
     89       1.8    itojun 			optlen = 1;
     90       1.8    itojun 			break;
     91       1.8    itojun 		case IP6OPT_PADN:
     92       1.8    itojun 			optlen = *(opt + 1) + 2;
     93       1.8    itojun 			break;
     94       1.8    itojun 		default:		/* unknown option */
     95       1.8    itojun 			optlen = ip6_unknown_opt(opt, m,
     96       1.8    itojun 			    opt - mtod(m, u_int8_t *));
     97       1.8    itojun 			if (optlen == -1)
     98       1.8    itojun 				return (IPPROTO_DONE);
     99       1.8    itojun 			optlen += 2;
    100       1.8    itojun 			break;
    101       1.2    itojun 		}
    102       1.2    itojun 	}
    103       1.2    itojun 
    104       1.2    itojun 	*offp = off;
    105       1.8    itojun 	return (dstopts->ip6d_nxt);
    106       1.2    itojun 
    107       1.2    itojun   bad:
    108       1.2    itojun 	m_freem(m);
    109       1.8    itojun 	return (IPPROTO_DONE);
    110       1.2    itojun }
    111