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

/*
 * Copyright (c) 2020 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*	$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 = 0, optlen = 0;
	struct ip6_dest *dstopts = NULL;
	u_int8_t *opt = NULL;

	/* 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;
		}
	}
	*mp = m;
	*offp = off;
	return dstopts->ip6d_nxt;

bad:
	*mp = NULL;
	m_freem(m);
	return IPPROTO_DONE;
}
Commit	Line	Data
eb6b6ca3 A	1	/*
	2	* Copyright (c) 2020 Apple Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
9bccf70c A	28	/* $FreeBSD: src/sys/netinet6/dest6.c,v 1.1.2.3 2001/07/03 11:01:49 ume Exp $ */
9bccf70c A	29	/* $KAME: dest6.c,v 1.27 2001/03/29 05:34:30 itojun Exp $ */
1c79356b A	30
	31	/*
	32	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
	33	* All rights reserved.
	34	*
	35	* Redistribution and use in source and binary forms, with or without
	36	* modification, are permitted provided that the following conditions
	37	* are met:
	38	* 1. Redistributions of source code must retain the above copyright
	39	* notice, this list of conditions and the following disclaimer.
	40	* 2. Redistributions in binary form must reproduce the above copyright
	41	* notice, this list of conditions and the following disclaimer in the
	42	* documentation and/or other materials provided with the distribution.
	43	* 3. Neither the name of the project nor the names of its contributors
	44	* may be used to endorse or promote products derived from this software
	45	* without specific prior written permission.
	46	*
	47	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	48	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	49	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	50	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	51	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	52	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	53	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	54	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	55	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	56	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	57	* SUCH DAMAGE.
	58	*/
	59
	60	#include <sys/param.h>
	61	#include <sys/systm.h>
	62	#include <sys/malloc.h>
	63	#include <sys/mbuf.h>
	64	#include <sys/domain.h>
	65	#include <sys/protosw.h>
	66	#include <sys/socket.h>
	67	#include <sys/errno.h>
	68	#include <sys/time.h>
	69	#include <sys/kernel.h>
	70
	71	#include <net/if.h>
	72	#include <net/route.h>
	73
	74	#include <netinet/in.h>
	75	#include <netinet/in_var.h>
	76	#include <netinet/ip6.h>
	77	#include <netinet6/ip6_var.h>
1c79356b A	78	#include <netinet/icmp6.h>
1c79356b A	79
1c79356b A	80	/*
	81	* Destination options header processing.
	82	*/
	83	int
6d2010ae	84	dest6_input(struct mbuf *mp, int offp, int proto)
1c79356b	85	{
6d2010ae	86	#pragma unused(proto)
9bccf70c	87	struct mbuf m = mp;
eb6b6ca3 A	88	int off = *offp, dstoptlen = 0, optlen = 0;
	89	struct ip6_dest *dstopts = NULL;
	90	u_int8_t *opt = NULL;
1c79356b A	91
1c79356b A	92	/* validation of the length of the header */
91447636	93	IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), return IPPROTO_DONE);
1c79356b	94	dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
1c79356b A	95	dstoptlen = (dstopts->ip6d_len + 1) << 3;
1c79356b A	96
91447636	97	IP6_EXTHDR_CHECK(m, off, dstoptlen, return IPPROTO_DONE);
1c79356b	98	dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
1c79356b A	99	off += dstoptlen;
	100	dstoptlen -= sizeof(struct ip6_dest);
	101	opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
	102
	103	/* search header for all options. */
	104	for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
9bccf70c A	105	if (*opt != IP6OPT_PAD1 &&
	106	(dstoptlen < IP6OPT_MINLEN \|\| *(opt + 1) + 2 > dstoptlen)) {
	107	ip6stat.ip6s_toosmall++;
	108	goto bad;
	109	}
1c79356b	110
9bccf70c A	111	switch (*opt) {
	112	case IP6OPT_PAD1:
	113	optlen = 1;
	114	break;
	115	case IP6OPT_PADN:
1c79356b A	116	optlen = *(opt + 1) + 2;
1c79356b A	117	break;
1c79356b	118
0a7de745	119	default: /* unknown option */
9bccf70c	120	optlen = ip6_unknown_opt(opt, m,
6d2010ae	121	opt - mtod(m, u_int8_t *));
0a7de745 A	122	if (optlen == -1) {
	123	return IPPROTO_DONE;
	124	}
9bccf70c A	125	optlen += 2;
9bccf70c A	126	break;
1c79356b A	127	}
1c79356b A	128	}
eb6b6ca3	129	*mp = m;
1c79356b	130	*offp = off;
0a7de745	131	return dstopts->ip6d_nxt;
1c79356b	132
0a7de745	133	bad:
eb6b6ca3	134	*mp = NULL;
1c79356b	135	m_freem(m);
0a7de745	136	return IPPROTO_DONE;
1c79356b	137	}