Home | History | Annotate | Line # | Download | only in netinet6
dest6.c revision 1.17.66.1 
      1  1.17.66.1    martin /*	$NetBSD: dest6.c,v 1.17.66.1 2015/01/17 12:10:54 martin 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  1.17.66.1    martin __KERNEL_RCSID(0, "$NetBSD: dest6.c,v 1.17.66.1 2015/01/17 12:10:54 martin 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 #include <net/route.h>
     48        1.2    itojun 
     49        1.2    itojun #include <netinet/in.h>
     50        1.2    itojun #include <netinet/in_var.h>
     51        1.7    itojun #include <netinet/ip6.h>
     52        1.2    itojun #include <netinet6/ip6_var.h>
     53       1.17   thorpej #include <netinet6/ip6_private.h>
     54        1.7    itojun #include <netinet/icmp6.h>
     55        1.2    itojun 
     56        1.2    itojun /*
     57        1.2    itojun  * Destination options header processing.
     58        1.2    itojun  */
     59        1.2    itojun int
     60       1.15  christos dest6_input(struct mbuf **mp, int *offp, int proto)
     61        1.2    itojun {
     62        1.8    itojun 	struct mbuf *m = *mp;
     63        1.2    itojun 	int off = *offp, dstoptlen, optlen;
     64        1.2    itojun 	struct ip6_dest *dstopts;
     65        1.2    itojun 	u_int8_t *opt;
     66        1.2    itojun 
     67        1.2    itojun 	/* validation of the length of the header */
     68        1.5    itojun 	IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
     69        1.5    itojun 	if (dstopts == NULL)
     70        1.5    itojun 		return IPPROTO_DONE;
     71        1.2    itojun 	dstoptlen = (dstopts->ip6d_len + 1) << 3;
     72        1.2    itojun 
     73        1.5    itojun 	IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
     74        1.5    itojun 	if (dstopts == NULL)
     75        1.5    itojun 		return IPPROTO_DONE;
     76        1.2    itojun 	off += dstoptlen;
     77        1.2    itojun 	dstoptlen -= sizeof(struct ip6_dest);
     78        1.2    itojun 	opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
     79        1.2    itojun 
     80        1.2    itojun 	/* search header for all options. */
     81        1.2    itojun 	for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
     82       1.10    itojun 		if (*opt != IP6OPT_PAD1 &&
     83       1.10    itojun 		    (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
     84       1.17   thorpej 			IP6_STATINC(IP6_STAT_TOOSMALL);
     85        1.9    itojun 			goto bad;
     86        1.9    itojun 		}
     87        1.9    itojun 
     88        1.8    itojun 		switch (*opt) {
     89        1.8    itojun 		case IP6OPT_PAD1:
     90        1.8    itojun 			optlen = 1;
     91        1.8    itojun 			break;
     92        1.8    itojun 		case IP6OPT_PADN:
     93        1.8    itojun 			optlen = *(opt + 1) + 2;
     94        1.8    itojun 			break;
     95        1.8    itojun 		default:		/* unknown option */
     96        1.8    itojun 			optlen = ip6_unknown_opt(opt, m,
     97        1.8    itojun 			    opt - mtod(m, u_int8_t *));
     98        1.8    itojun 			if (optlen == -1)
     99        1.8    itojun 				return (IPPROTO_DONE);
    100        1.8    itojun 			optlen += 2;
    101        1.8    itojun 			break;
    102        1.2    itojun 		}
    103        1.2    itojun 	}
    104        1.2    itojun 
    105        1.2    itojun 	*offp = off;
    106        1.8    itojun 	return (dstopts->ip6d_nxt);
    107        1.2    itojun 
    108        1.2    itojun   bad:
    109        1.2    itojun 	m_freem(m);
    110        1.8    itojun 	return (IPPROTO_DONE);
    111        1.2    itojun }
    112