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	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	*/
	28	/* $FreeBSD: src/sys/netinet6/dest6.c,v 1.1.2.3 2001/07/03 11:01:49 ume Exp $ */
	29	/* $KAME: dest6.c,v 1.27 2001/03/29 05:34:30 itojun Exp $ */
	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>
	78	#include <netinet/icmp6.h>
	79
	80	/*
	81	* Destination options header processing.
	82	*/
	83	int
	84	dest6_input(struct mbuf *mp, int offp, int proto)
	85	{
	86	#pragma unused(proto)
	87	struct mbuf m = mp;
	88	int off = *offp, dstoptlen = 0, optlen = 0;
	89	struct ip6_dest *dstopts = NULL;
	90	u_int8_t *opt = NULL;
	91
	92	/* validation of the length of the header */
	93	IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), return IPPROTO_DONE);
	94	dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
	95	dstoptlen = (dstopts->ip6d_len + 1) << 3;
	96
	97	IP6_EXTHDR_CHECK(m, off, dstoptlen, return IPPROTO_DONE);
	98	dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off);
	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) {
	105	if (*opt != IP6OPT_PAD1 &&
	106	(dstoptlen < IP6OPT_MINLEN \|\| *(opt + 1) + 2 > dstoptlen)) {
	107	ip6stat.ip6s_toosmall++;
	108	goto bad;
	109	}
	110
	111	switch (*opt) {
	112	case IP6OPT_PAD1:
	113	optlen = 1;
	114	break;
	115	case IP6OPT_PADN:
	116	optlen = *(opt + 1) + 2;
	117	break;
	118
	119	default: /* unknown option */
	120	optlen = ip6_unknown_opt(opt, m,
	121	opt - mtod(m, u_int8_t *));
	122	if (optlen == -1) {
	123	return IPPROTO_DONE;
	124	}
	125	optlen += 2;
	126	break;
	127	}
	128	}
	129	*mp = m;
	130	*offp = off;
	131	return dstopts->ip6d_nxt;
	132
	133	bad:
	134	*mp = NULL;
	135	m_freem(m);
	136	return IPPROTO_DONE;
	137	}