[apple/xnu.git] / bsd / netinet6 / dest6.c

/*	$FreeBSD: src/sys/netinet6/dest6.c,v 1.1.2.3 2001/07/03 11:01:49 ume Exp $	*/
/*	$KAME: dest6.c,v 1.27 2001/03/29 05:34:30 itojun Exp $	*/

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/kernel.h>

#include <net/if.h>
#include <net/route.h>

#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet/icmp6.h>

/*
 * Destination options header processing.
 */
int
dest6_input(struct mbuf **mp, int *offp, int proto)
{
#pragma unused(proto)
	struct mbuf *m = *mp;
	int off = *offp, dstoptlen, optlen;
	struct ip6_dest *dstopts;
	u_int8_t *opt;

	/* validation of the length of the header */
	IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), return IPPROTO_DONE);
	dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
	dstoptlen = (dstopts->ip6d_len + 1) << 3;

	IP6_EXTHDR_CHECK(m, off, dstoptlen, return IPPROTO_DONE);
	dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
	off += dstoptlen;
	dstoptlen -= sizeof(struct ip6_dest);
	opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);

	/* search header for all options. */
	for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
		if (*opt != IP6OPT_PAD1 &&
		    (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
			ip6stat.ip6s_toosmall++;
			goto bad;
		}

		switch (*opt) {
		case IP6OPT_PAD1:
			optlen = 1;
			break;
		case IP6OPT_PADN:
			optlen = *(opt + 1) + 2;
			break;

		default:		/* unknown option */
			optlen = ip6_unknown_opt(opt, m,
			    opt - mtod(m, u_int8_t *));
			if (optlen == -1)
				return (IPPROTO_DONE);
			optlen += 2;
			break;
		}
	}

	*offp = off;
	return (dstopts->ip6d_nxt);

  bad:
	m_freem(m);
	return (IPPROTO_DONE);
}
Commit	Line	Data
9bccf70c A	1	/* $FreeBSD: src/sys/netinet6/dest6.c,v 1.1.2.3 2001/07/03 11:01:49 ume Exp $ */
9bccf70c A	2	/* $KAME: dest6.c,v 1.27 2001/03/29 05:34:30 itojun Exp $ */
1c79356b A	3
	4	/*
	5	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
	6	* All rights reserved.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. Neither the name of the project nor the names of its contributors
	17	* may be used to endorse or promote products derived from this software
	18	* without specific prior written permission.
	19	*
	20	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	21	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	22	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	23	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	24	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	25	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	26	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	27	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	28	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	29	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	30	* SUCH DAMAGE.
	31	*/
	32
	33	#include <sys/param.h>
	34	#include <sys/systm.h>
	35	#include <sys/malloc.h>
	36	#include <sys/mbuf.h>
	37	#include <sys/domain.h>
	38	#include <sys/protosw.h>
	39	#include <sys/socket.h>
	40	#include <sys/errno.h>
	41	#include <sys/time.h>
	42	#include <sys/kernel.h>
	43
	44	#include <net/if.h>
	45	#include <net/route.h>
	46
	47	#include <netinet/in.h>
	48	#include <netinet/in_var.h>
	49	#include <netinet/ip6.h>
	50	#include <netinet6/ip6_var.h>
1c79356b A	51	#include <netinet/icmp6.h>
1c79356b A	52
1c79356b A	53	/*
	54	* Destination options header processing.
	55	*/
	56	int
6d2010ae	57	dest6_input(struct mbuf *mp, int offp, int proto)
1c79356b	58	{
6d2010ae	59	#pragma unused(proto)
9bccf70c	60	struct mbuf m = mp;
1c79356b A	61	int off = *offp, dstoptlen, optlen;
	62	struct ip6_dest *dstopts;
	63	u_int8_t *opt;
	64
	65	/* validation of the length of the header */
91447636	66	IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), return IPPROTO_DONE);
1c79356b	67	dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
1c79356b A	68	dstoptlen = (dstopts->ip6d_len + 1) << 3;
1c79356b A	69
91447636	70	IP6_EXTHDR_CHECK(m, off, dstoptlen, return IPPROTO_DONE);
1c79356b	71	dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
1c79356b A	72	off += dstoptlen;
	73	dstoptlen -= sizeof(struct ip6_dest);
	74	opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
	75
	76	/* search header for all options. */
	77	for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
9bccf70c A	78	if (*opt != IP6OPT_PAD1 &&
	79	(dstoptlen < IP6OPT_MINLEN \|\| *(opt + 1) + 2 > dstoptlen)) {
	80	ip6stat.ip6s_toosmall++;
	81	goto bad;
	82	}
1c79356b	83
9bccf70c A	84	switch (*opt) {
	85	case IP6OPT_PAD1:
	86	optlen = 1;
	87	break;
	88	case IP6OPT_PADN:
1c79356b A	89	optlen = *(opt + 1) + 2;
1c79356b A	90	break;
1c79356b	91
9bccf70c A	92	default: /* unknown option */
9bccf70c A	93	optlen = ip6_unknown_opt(opt, m,
6d2010ae	94	opt - mtod(m, u_int8_t *));
9bccf70c A	95	if (optlen == -1)
	96	return (IPPROTO_DONE);
	97	optlen += 2;
	98	break;
1c79356b A	99	}
	100	}
	101
1c79356b	102	*offp = off;
9bccf70c	103	return (dstopts->ip6d_nxt);
1c79356b A	104
	105	bad:
	106	m_freem(m);
9bccf70c	107	return (IPPROTO_DONE);
1c79356b	108	}