[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(mp, offp)
	struct mbuf **mp;
	int *offp;
{
	struct mbuf *m = *mp;
	int off = *offp, dstoptlen, optlen;
	struct ip6_dest *dstopts;
	u_int8_t *opt;
	struct ip6_hdr *ip6;

	ip6 = mtod(m, struct ip6_hdr *);

	/* validation of the length of the header */
#ifndef PULLDOWN_TEST
	IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE);
	dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
#else
	IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
	if (dstopts == NULL)
		return IPPROTO_DONE;
#endif
	dstoptlen = (dstopts->ip6d_len + 1) << 3;

#ifndef PULLDOWN_TEST
	IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE);
	dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
#else
	IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
	if (dstopts == NULL)
		return IPPROTO_DONE;
#endif
	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
55e303ae	57	dest6_input(mp, offp)
1c79356b	58	struct mbuf **mp;
55e303ae	59	int *offp;
1c79356b	60	{
9bccf70c	61	struct mbuf m = mp;
1c79356b A	62	int off = *offp, dstoptlen, optlen;
	63	struct ip6_dest *dstopts;
	64	u_int8_t *opt;
9bccf70c A	65	struct ip6_hdr *ip6;
	66
	67	ip6 = mtod(m, struct ip6_hdr *);
1c79356b A	68
	69	/* validation of the length of the header */
	70	#ifndef PULLDOWN_TEST
	71	IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE);
	72	dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
	73	#else
	74	IP6_EXTHDR_GET(dstopts, struct ip6_dest , m, off, sizeof(dstopts));
	75	if (dstopts == NULL)
	76	return IPPROTO_DONE;
	77	#endif
	78	dstoptlen = (dstopts->ip6d_len + 1) << 3;
	79
	80	#ifndef PULLDOWN_TEST
	81	IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE);
	82	dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
	83	#else
	84	IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
	85	if (dstopts == NULL)
	86	return IPPROTO_DONE;
	87	#endif
	88	off += dstoptlen;
	89	dstoptlen -= sizeof(struct ip6_dest);
	90	opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
	91
	92	/* search header for all options. */
	93	for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
9bccf70c A	94	if (*opt != IP6OPT_PAD1 &&
	95	(dstoptlen < IP6OPT_MINLEN \|\| *(opt + 1) + 2 > dstoptlen)) {
	96	ip6stat.ip6s_toosmall++;
	97	goto bad;
	98	}
1c79356b	99
9bccf70c A	100	switch (*opt) {
	101	case IP6OPT_PAD1:
	102	optlen = 1;
	103	break;
	104	case IP6OPT_PADN:
1c79356b A	105	optlen = *(opt + 1) + 2;
1c79356b A	106	break;
1c79356b	107
9bccf70c A	108	default: /* unknown option */
	109	optlen = ip6_unknown_opt(opt, m,
	110	opt - mtod(m, u_int8_t *));
	111	if (optlen == -1)
	112	return (IPPROTO_DONE);
	113	optlen += 2;
	114	break;
1c79356b A	115	}
	116	}
	117
1c79356b	118	*offp = off;
9bccf70c	119	return (dstopts->ip6d_nxt);
1c79356b A	120
	121	bad:
	122	m_freem(m);
9bccf70c	123	return (IPPROTO_DONE);
1c79356b	124	}