[apple/xnu.git] / bsd / netinet6 / route6.c

/*
 * Copyright (c) 2000-2020 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@
 */

/*
 * 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/mcache.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/queue.h>
#include <kern/debug.h>
#include <string.h>

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

#include <netinet/in.h>
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>

#include <netinet/icmp6.h>

int
route6_input(struct mbuf **mp, int *offp, int proto)
{
#pragma unused(proto)
	struct ip6_hdr *ip6 = NULL;
	struct mbuf *m = *mp;
	struct ip6_rthdr *rh = NULL;
	int off = *offp, rhlen = 0;
#ifdef notyet
	struct ip6aux *ip6a = NULL;

	ip6a = ip6_findaux(m);
	if (ip6a) {
		/* XXX reject home-address option before rthdr */
		if (ip6a->ip6a_flags & IP6A_SWAP) {
			ip6stat.ip6s_badoptions++;
			*mp = NULL;
			m_freem(m);
			return IPPROTO_DONE;
		}
	}
	ip6a = NULL;
#endif /* notyet */

	IP6_EXTHDR_CHECK(m, off, sizeof(*rh), return IPPROTO_DONE);

	/* Expect 32-bit aligned data pointer on strict-align platforms */
	MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);

	ip6 = mtod(m, struct ip6_hdr *);
	rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);

	switch (rh->ip6r_type) {
	default:
		/* unknown routing type */
		if (rh->ip6r_segleft == 0) {
			rhlen = (rh->ip6r_len + 1) << 3;
			break;  /* Final dst. Just ignore the header. */
		}
		ip6stat.ip6s_badoptions++;
		icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
		    (int)((caddr_t)&rh->ip6r_type - (caddr_t)ip6));
		return IPPROTO_DONE;
	}

	*mp = m;
	*offp += rhlen;
	return rh->ip6r_nxt;
}
Commit	Line	Data
6d2010ae	1	/*
eb6b6ca3	2	* Copyright (c) 2000-2020 Apple Inc. All rights reserved.
6d2010ae A	3	*
6d2010ae A	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
39236c6e	5	*
6d2010ae A	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.
39236c6e	14	*
6d2010ae A	15	* Please obtain a copy of the License at
6d2010ae A	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
39236c6e	17	*
6d2010ae A	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.
39236c6e	25	*
6d2010ae A	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28
1c79356b A	29	/*
	30	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
	31	* All rights reserved.
	32	*
	33	* Redistribution and use in source and binary forms, with or without
	34	* modification, are permitted provided that the following conditions
	35	* are met:
	36	* 1. Redistributions of source code must retain the above copyright
	37	* notice, this list of conditions and the following disclaimer.
	38	* 2. Redistributions in binary form must reproduce the above copyright
	39	* notice, this list of conditions and the following disclaimer in the
	40	* documentation and/or other materials provided with the distribution.
	41	* 3. Neither the name of the project nor the names of its contributors
	42	* may be used to endorse or promote products derived from this software
	43	* without specific prior written permission.
	44	*
	45	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	46	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	47	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	48	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	49	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	50	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	51	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	52	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	53	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	54	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	55	* SUCH DAMAGE.
	56	*/
	57
	58	#include <sys/param.h>
316670eb	59	#include <sys/mcache.h>
1c79356b A	60	#include <sys/mbuf.h>
1c79356b A	61	#include <sys/socket.h>
9bccf70c	62	#include <sys/queue.h>
316670eb	63	#include <kern/debug.h>
2d21ac55	64	#include <string.h>
1c79356b A	65
1c79356b A	66	#include <net/if.h>
2d21ac55	67	#include <net/route.h>
1c79356b A	68
	69	#include <netinet/in.h>
	70	#include <netinet6/in6_var.h>
	71	#include <netinet/ip6.h>
	72	#include <netinet6/ip6_var.h>
	73
	74	#include <netinet/icmp6.h>
	75
1c79356b	76	int
6d2010ae	77	route6_input(struct mbuf *mp, int offp, int proto)
1c79356b	78	{
6d2010ae	79	#pragma unused(proto)
eb6b6ca3	80	struct ip6_hdr *ip6 = NULL;
9bccf70c	81	struct mbuf m = mp;
eb6b6ca3 A	82	struct ip6_rthdr *rh = NULL;
eb6b6ca3 A	83	int off = *offp, rhlen = 0;
39236c6e	84	#ifdef notyet
eb6b6ca3	85	struct ip6aux *ip6a = NULL;
9bccf70c	86
2d21ac55 A	87	ip6a = ip6_findaux(m);
2d21ac55 A	88	if (ip6a) {
9bccf70c A	89	/* XXX reject home-address option before rthdr */
	90	if (ip6a->ip6a_flags & IP6A_SWAP) {
	91	ip6stat.ip6s_badoptions++;
eb6b6ca3	92	*mp = NULL;
9bccf70c A	93	m_freem(m);
	94	return IPPROTO_DONE;
	95	}
	96	}
eb6b6ca3	97	ip6a = NULL;
39236c6e	98	#endif /* notyet */
1c79356b	99
91447636	100	IP6_EXTHDR_CHECK(m, off, sizeof(*rh), return IPPROTO_DONE);
316670eb A	101
	102	/* Expect 32-bit aligned data pointer on strict-align platforms */
	103	MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
	104
1c79356b A	105	ip6 = mtod(m, struct ip6_hdr *);
1c79356b A	106	rh = (struct ip6_rthdr *)((caddr_t)ip6 + off);
1c79356b	107
9bccf70c	108	switch (rh->ip6r_type) {
9bccf70c A	109	default:
	110	/* unknown routing type */
	111	if (rh->ip6r_segleft == 0) {
	112	rhlen = (rh->ip6r_len + 1) << 3;
0a7de745	113	break; /* Final dst. Just ignore the header. */
9bccf70c A	114	}
	115	ip6stat.ip6s_badoptions++;
	116	icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
f427ee49	117	(int)((caddr_t)&rh->ip6r_type - (caddr_t)ip6));
0a7de745	118	return IPPROTO_DONE;
9bccf70c A	119	}
9bccf70c A	120
eb6b6ca3	121	*mp = m;
1c79356b	122	*offp += rhlen;
0a7de745	123	return rh->ip6r_nxt;
1c79356b	124	}