[apple/xnu.git] / bsd / netinet / in_gif.c

/*
 * Copyright (c) 2000 Apple Computer, 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@
 */
/*	$KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 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/socket.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>

#include <sys/malloc.h>

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

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/in_gif.h>
#include <netinet/in_var.h>
#include <netinet/ip_encap.h>
#include <netinet/ip_ecn.h>

#if INET6
#include <netinet/ip6.h>
#endif

#if MROUTING
#include <netinet/ip_mroute.h>
#endif /* MROUTING */

#include <net/if_gif.h>	

#include <net/net_osdep.h>

int ip_gif_ttl = GIF_TTL;
SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
	&ip_gif_ttl,	0, "");

int
in_gif_output(
	struct ifnet	*ifp,
	int		family,
	struct mbuf	*m,
	struct rtentry *rt)
{
	struct gif_softc *sc = (struct gif_softc*)ifp;
	struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
	struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
	struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
	struct ip iphdr;	/* capsule IP header, host byte ordered */
	int proto, error;
	u_int8_t tos;

	if (sin_src == NULL || sin_dst == NULL ||
	    sin_src->sin_family != AF_INET ||
	    sin_dst->sin_family != AF_INET) {
		m_freem(m);
		return EAFNOSUPPORT;
	}

	switch (family) {
#if INET
	case AF_INET:
	    {
		struct ip *ip;

		proto = IPPROTO_IPV4;
		if (m->m_len < sizeof(*ip)) {
			m = m_pullup(m, sizeof(*ip));
			if (!m)
				return ENOBUFS;
		}
		ip = mtod(m, struct ip *);
		tos = ip->ip_tos;
		break;
	    }
#endif /*INET*/
#if INET6
	case AF_INET6:
	    {
		struct ip6_hdr *ip6;
		proto = IPPROTO_IPV6;
		if (m->m_len < sizeof(*ip6)) {
			m = m_pullup(m, sizeof(*ip6));
			if (!m)
				return ENOBUFS;
		}
		ip6 = mtod(m, struct ip6_hdr *);
		tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
		break;
	    }
#endif /*INET6*/
	default:
#if DEBUG
		printf("in_gif_output: warning: unknown family %d passed\n",
			family);
#endif
		m_freem(m);
		return EAFNOSUPPORT;
	}

	bzero(&iphdr, sizeof(iphdr));
	iphdr.ip_src = sin_src->sin_addr;
	/* bidirectional configured tunnel mode */
	if (sin_dst->sin_addr.s_addr != INADDR_ANY)
		iphdr.ip_dst = sin_dst->sin_addr;
	else {
		m_freem(m);
		return ENETUNREACH;
	}
	iphdr.ip_p = proto;
	/* version will be set in ip_output() */
	iphdr.ip_ttl = ip_gif_ttl;
	iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
	if (ifp->if_flags & IFF_LINK1)
		ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
	else
		ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);

	/* prepend new IP header */
	M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
	if (m && m->m_len < sizeof(struct ip))
		m = m_pullup(m, sizeof(struct ip));
	if (m == NULL) {
		printf("ENOBUFS in in_gif_output %d\n", __LINE__);
		return ENOBUFS;
	}
	bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));

	if (dst->sin_family != sin_dst->sin_family ||
	    dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
		/* cache route doesn't match */
		dst->sin_family = sin_dst->sin_family;
		dst->sin_len = sizeof(struct sockaddr_in);
		dst->sin_addr = sin_dst->sin_addr;
		if (sc->gif_ro.ro_rt) {
			rtfree(sc->gif_ro.ro_rt);
			sc->gif_ro.ro_rt = NULL;
		}
#if 0
		sc->gif_if.if_mtu = GIF_MTU;
#endif
	}

	if (sc->gif_ro.ro_rt == NULL) {
		rtalloc(&sc->gif_ro);
		if (sc->gif_ro.ro_rt == NULL) {
			m_freem(m);
			return ENETUNREACH;
		}

		/* if it constitutes infinite encapsulation, punt. */
		if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
			m_freem(m);
			return ENETUNREACH;	/*XXX*/
		}
#if 0
		ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
			- sizeof(struct ip);
#endif
	}

	error = ip_output(m, NULL, &sc->gif_ro, 0, NULL);
	return(error);
}

void
in_gif_input(m, off)
	struct mbuf *m;
	int off;
{
	struct ifnet *gifp = NULL;
	struct ip *ip;
	int i, af, proto;
	u_int8_t otos;

	ip = mtod(m, struct ip *);
	proto = ip->ip_p;


	gifp = (struct ifnet *)encap_getarg(m);

	if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
		m_freem(m);
		ipstat.ips_nogif++;
		return;
	}

	otos = ip->ip_tos;
	m_adj(m, off);

	switch (proto) {
#if INET
	case IPPROTO_IPV4:
	    {
		struct ip *ip;
		af = AF_INET;
		if (m->m_len < sizeof(*ip)) {
			m = m_pullup(m, sizeof(*ip));
			if (!m)
				return;
		}
		ip = mtod(m, struct ip *);
		if (gifp->if_flags & IFF_LINK1)
			ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
		else
			ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
		break;
	    }
#endif
#if INET6
	case IPPROTO_IPV6:
	    {
		struct ip6_hdr *ip6;
		u_int8_t itos;
		af = AF_INET6;
		if (m->m_len < sizeof(*ip6)) {
			m = m_pullup(m, sizeof(*ip6));
			if (!m)
				return;
		}
		ip6 = mtod(m, struct ip6_hdr *);
		itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
		if (gifp->if_flags & IFF_LINK1)
			ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
		else
			ip_ecn_egress(ECN_NOCARE, &otos, &itos);
		ip6->ip6_flow &= ~htonl(0xff << 20);
		ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
		break;
	    }
#endif /* INET6 */
	default:
		ipstat.ips_nogif++;
		m_freem(m);
		return;
	}
#ifdef __APPLE__
	/* Should we free m if dlil_input returns an error? */
	if (m->m_pkthdr.rcvif)	/* replace the rcvif by gifp for dlil to route it correctly */
		m->m_pkthdr.rcvif = gifp;
	dlil_input_packet(gifp, m, NULL);
#else
	gif_input(m, af, gifp);
#endif
	return;
}

/*
 * we know that we are in IFF_UP, outer address available, and outer family
 * matched the physical addr family.  see gif_encapcheck().
 */
int
gif_encapcheck4(m, off, proto, arg)
	const struct mbuf *m;
	int off;
	int proto;
	void *arg;
{
	struct ip ip;
	struct gif_softc *sc;
	struct sockaddr_in *src, *dst;
	int addrmatch;
	struct in_ifaddr *ia4;

	/* sanity check done in caller */
	sc = (struct gif_softc *)arg;
	src = (struct sockaddr_in *)sc->gif_psrc;
	dst = (struct sockaddr_in *)sc->gif_pdst;

	/* LINTED const cast */
	m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip);

	/* check for address match */
	addrmatch = 0;
	if (src->sin_addr.s_addr == ip.ip_dst.s_addr)
		addrmatch |= 1;
	if (dst->sin_addr.s_addr == ip.ip_src.s_addr)
		addrmatch |= 2;
	if (addrmatch != 3)
		return 0;

	/* martian filters on outer source - NOT done in ip_input! */
	if (IN_MULTICAST(ntohl(ip.ip_src.s_addr)))
		return 0;
	switch ((ntohl(ip.ip_src.s_addr) & 0xff000000) >> 24) {
	case 0: case 127: case 255:
		return 0;
	}
	/* reject packets with broadcast on source */
	lck_mtx_lock(rt_mtx);
	for (ia4 = TAILQ_FIRST(&in_ifaddrhead); ia4;
	     ia4 = TAILQ_NEXT(ia4, ia_link))
	{
		if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
			continue;
		if (ip.ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr) {
			lck_mtx_unlock(rt_mtx);
			return 0;
		}
	}
	lck_mtx_unlock(rt_mtx);

	/* ingress filters on outer source */
	if ((sc->gif_if.if_flags & IFF_LINK2) == 0 &&
	    (m->m_flags & M_PKTHDR) != 0 && m->m_pkthdr.rcvif) {
		struct sockaddr_in sin;
		struct rtentry *rt;

		bzero(&sin, sizeof(sin));
		sin.sin_family = AF_INET;
		sin.sin_len = sizeof(struct sockaddr_in);
		sin.sin_addr = ip.ip_src;
		rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
		if (!rt || rt->rt_ifp != m->m_pkthdr.rcvif) {
#if 0
			log(LOG_WARNING, "%s: packet from 0x%x dropped "
			    "due to ingress filter\n", if_name(&sc->gif_if),
			    (u_int32_t)ntohl(sin.sin_addr.s_addr));
#endif
			if (rt)
				rtfree(rt);
			return 0;
		}
		rtfree(rt);
	}

	return 32 * 2;
}
Commit	Line	Data
1c79356b	1	/*
5d5c5d0d A	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
5d5c5d0d A	3	*
8f6c56a5	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
8f6c56a5 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.
	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
8ad349bb	24	* limitations under the License.
8f6c56a5 A	25	*
8f6c56a5 A	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b	27	*/
9bccf70c	28	/* $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $ */
1c79356b A	29
	30	/*
	31	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
	32	* All rights reserved.
	33	*
	34	* Redistribution and use in source and binary forms, with or without
	35	* modification, are permitted provided that the following conditions
	36	* are met:
	37	* 1. Redistributions of source code must retain the above copyright
	38	* notice, this list of conditions and the following disclaimer.
	39	* 2. Redistributions in binary form must reproduce the above copyright
	40	* notice, this list of conditions and the following disclaimer in the
	41	* documentation and/or other materials provided with the distribution.
	42	* 3. Neither the name of the project nor the names of its contributors
	43	* may be used to endorse or promote products derived from this software
	44	* without specific prior written permission.
	45	*
	46	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	47	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	48	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	49	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	50	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	51	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	52	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	53	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	54	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	55	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	56	* SUCH DAMAGE.
	57	*/
	58
1c79356b A	59
	60	#include <sys/param.h>
	61	#include <sys/systm.h>
	62	#include <sys/socket.h>
	63	#include <sys/sockio.h>
1c79356b A	64	#include <sys/mbuf.h>
1c79356b A	65	#include <sys/errno.h>
1c79356b A	66	#include <sys/kernel.h>
1c79356b A	67	#include <sys/sysctl.h>
1c79356b	68
1c79356b	69	#include <sys/malloc.h>
1c79356b A	70
	71	#include <net/if.h>
	72	#include <net/route.h>
1c79356b A	73
	74	#include <netinet/in.h>
	75	#include <netinet/in_systm.h>
	76	#include <netinet/ip.h>
	77	#include <netinet/ip_var.h>
	78	#include <netinet/in_gif.h>
	79	#include <netinet/in_var.h>
	80	#include <netinet/ip_encap.h>
	81	#include <netinet/ip_ecn.h>
	82
	83	#if INET6
	84	#include <netinet/ip6.h>
	85	#endif
	86
	87	#if MROUTING
	88	#include <netinet/ip_mroute.h>
	89	#endif /* MROUTING */
	90
	91	#include <net/if_gif.h>
	92
1c79356b A	93	#include <net/net_osdep.h>
1c79356b A	94
9bccf70c A	95	int ip_gif_ttl = GIF_TTL;
	96	SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
	97	&ip_gif_ttl, 0, "");
1c79356b A	98
1c79356b A	99	int
91447636 A	100	in_gif_output(
	101	struct ifnet *ifp,
	102	int family,
	103	struct mbuf *m,
	104	struct rtentry *rt)
1c79356b	105	{
9bccf70c	106	struct gif_softc sc = (struct gif_softc)ifp;
1c79356b A	107	struct sockaddr_in dst = (struct sockaddr_in )&sc->gif_ro.ro_dst;
	108	struct sockaddr_in sin_src = (struct sockaddr_in )sc->gif_psrc;
	109	struct sockaddr_in sin_dst = (struct sockaddr_in )sc->gif_pdst;
	110	struct ip iphdr; /* capsule IP header, host byte ordered */
	111	int proto, error;
	112	u_int8_t tos;
	113
	114	if (sin_src == NULL \|\| sin_dst == NULL \|\|
	115	sin_src->sin_family != AF_INET \|\|
	116	sin_dst->sin_family != AF_INET) {
1c79356b A	117	m_freem(m);
	118	return EAFNOSUPPORT;
	119	}
	120
	121	switch (family) {
	122	#if INET
	123	case AF_INET:
	124	{
	125	struct ip *ip;
	126
	127	proto = IPPROTO_IPV4;
	128	if (m->m_len < sizeof(*ip)) {
	129	m = m_pullup(m, sizeof(*ip));
	130	if (!m)
	131	return ENOBUFS;
	132	}
	133	ip = mtod(m, struct ip *);
	134	tos = ip->ip_tos;
	135	break;
	136	}
	137	#endif /INET/
	138	#if INET6
	139	case AF_INET6:
	140	{
	141	struct ip6_hdr *ip6;
	142	proto = IPPROTO_IPV6;
	143	if (m->m_len < sizeof(*ip6)) {
	144	m = m_pullup(m, sizeof(*ip6));
	145	if (!m)
	146	return ENOBUFS;
	147	}
	148	ip6 = mtod(m, struct ip6_hdr *);
	149	tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
	150	break;
	151	}
	152	#endif /INET6/
	153	default:
	154	#if DEBUG
	155	printf("in_gif_output: warning: unknown family %d passed\n",
	156	family);
	157	#endif
	158	m_freem(m);
	159	return EAFNOSUPPORT;
	160	}
	161
	162	bzero(&iphdr, sizeof(iphdr));
	163	iphdr.ip_src = sin_src->sin_addr;
9bccf70c A	164	/* bidirectional configured tunnel mode */
	165	if (sin_dst->sin_addr.s_addr != INADDR_ANY)
	166	iphdr.ip_dst = sin_dst->sin_addr;
	167	else {
	168	m_freem(m);
	169	return ENETUNREACH;
1c79356b A	170	}
	171	iphdr.ip_p = proto;
	172	/* version will be set in ip_output() */
	173	iphdr.ip_ttl = ip_gif_ttl;
	174	iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
	175	if (ifp->if_flags & IFF_LINK1)
	176	ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
9bccf70c A	177	else
9bccf70c A	178	ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
1c79356b A	179
	180	/* prepend new IP header */
	181	M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
	182	if (m && m->m_len < sizeof(struct ip))
	183	m = m_pullup(m, sizeof(struct ip));
	184	if (m == NULL) {
	185	printf("ENOBUFS in in_gif_output %d\n", __LINE__);
	186	return ENOBUFS;
	187	}
9bccf70c	188	bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
1c79356b A	189
	190	if (dst->sin_family != sin_dst->sin_family \|\|
	191	dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
	192	/* cache route doesn't match */
	193	dst->sin_family = sin_dst->sin_family;
	194	dst->sin_len = sizeof(struct sockaddr_in);
	195	dst->sin_addr = sin_dst->sin_addr;
	196	if (sc->gif_ro.ro_rt) {
9bccf70c	197	rtfree(sc->gif_ro.ro_rt);
1c79356b A	198	sc->gif_ro.ro_rt = NULL;
	199	}
	200	#if 0
	201	sc->gif_if.if_mtu = GIF_MTU;
	202	#endif
	203	}
	204
	205	if (sc->gif_ro.ro_rt == NULL) {
	206	rtalloc(&sc->gif_ro);
	207	if (sc->gif_ro.ro_rt == NULL) {
	208	m_freem(m);
	209	return ENETUNREACH;
	210	}
9bccf70c A	211
	212	/* if it constitutes infinite encapsulation, punt. */
	213	if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
	214	m_freem(m);
	215	return ENETUNREACH; /XXX/
	216	}
1c79356b A	217	#if 0
	218	ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
	219	- sizeof(struct ip);
	220	#endif
	221	}
	222
1c79356b	223	error = ip_output(m, NULL, &sc->gif_ro, 0, NULL);
1c79356b A	224	return(error);
	225	}
	226
	227	void
	228	in_gif_input(m, off)
	229	struct mbuf *m;
	230	int off;
	231	{
1c79356b A	232	struct ifnet *gifp = NULL;
	233	struct ip *ip;
	234	int i, af, proto;
	235	u_int8_t otos;
	236
1c79356b	237	ip = mtod(m, struct ip *);
9bccf70c	238	proto = ip->ip_p;
1c79356b	239
1c79356b	240
1c79356b	241	gifp = (struct ifnet *)encap_getarg(m);
1c79356b	242
9bccf70c	243	if (gifp == NULL \|\| (gifp->if_flags & IFF_UP) == 0) {
1c79356b A	244	m_freem(m);
	245	ipstat.ips_nogif++;
	246	return;
	247	}
	248
	249	otos = ip->ip_tos;
	250	m_adj(m, off);
	251
	252	switch (proto) {
	253	#if INET
	254	case IPPROTO_IPV4:
	255	{
	256	struct ip *ip;
	257	af = AF_INET;
	258	if (m->m_len < sizeof(*ip)) {
	259	m = m_pullup(m, sizeof(*ip));
	260	if (!m)
	261	return;
	262	}
	263	ip = mtod(m, struct ip *);
	264	if (gifp->if_flags & IFF_LINK1)
	265	ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
9bccf70c A	266	else
9bccf70c A	267	ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
1c79356b A	268	break;
	269	}
	270	#endif
	271	#if INET6
	272	case IPPROTO_IPV6:
	273	{
	274	struct ip6_hdr *ip6;
	275	u_int8_t itos;
	276	af = AF_INET6;
	277	if (m->m_len < sizeof(*ip6)) {
	278	m = m_pullup(m, sizeof(*ip6));
	279	if (!m)
	280	return;
	281	}
	282	ip6 = mtod(m, struct ip6_hdr *);
	283	itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
	284	if (gifp->if_flags & IFF_LINK1)
	285	ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
9bccf70c A	286	else
9bccf70c A	287	ip_ecn_egress(ECN_NOCARE, &otos, &itos);
1c79356b A	288	ip6->ip6_flow &= ~htonl(0xff << 20);
	289	ip6->ip6_flow \|= htonl((u_int32_t)itos << 20);
	290	break;
	291	}
	292	#endif /* INET6 */
	293	default:
	294	ipstat.ips_nogif++;
	295	m_freem(m);
	296	return;
	297	}
9bccf70c A	298	#ifdef __APPLE__
	299	/* Should we free m if dlil_input returns an error? */
	300	if (m->m_pkthdr.rcvif) /* replace the rcvif by gifp for dlil to route it correctly */
	301	m->m_pkthdr.rcvif = gifp;
	302	dlil_input_packet(gifp, m, NULL);
	303	#else
1c79356b	304	gif_input(m, af, gifp);
9bccf70c	305	#endif
1c79356b A	306	return;
	307	}
	308
9bccf70c A	309	/*
	310	* we know that we are in IFF_UP, outer address available, and outer family
	311	* matched the physical addr family. see gif_encapcheck().
	312	*/
1c79356b	313	int
9bccf70c A	314	gif_encapcheck4(m, off, proto, arg)
	315	const struct mbuf *m;
	316	int off;
	317	int proto;
	318	void *arg;
1c79356b	319	{
9bccf70c A	320	struct ip ip;
	321	struct gif_softc *sc;
	322	struct sockaddr_in src, dst;
	323	int addrmatch;
	324	struct in_ifaddr *ia4;
	325
	326	/* sanity check done in caller */
	327	sc = (struct gif_softc *)arg;
	328	src = (struct sockaddr_in *)sc->gif_psrc;
	329	dst = (struct sockaddr_in *)sc->gif_pdst;
	330
	331	/* LINTED const cast */
	332	m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip);
	333
	334	/* check for address match */
	335	addrmatch = 0;
	336	if (src->sin_addr.s_addr == ip.ip_dst.s_addr)
	337	addrmatch \|= 1;
	338	if (dst->sin_addr.s_addr == ip.ip_src.s_addr)
	339	addrmatch \|= 2;
	340	if (addrmatch != 3)
	341	return 0;
	342
	343	/* martian filters on outer source - NOT done in ip_input! */
	344	if (IN_MULTICAST(ntohl(ip.ip_src.s_addr)))
	345	return 0;
	346	switch ((ntohl(ip.ip_src.s_addr) & 0xff000000) >> 24) {
	347	case 0: case 127: case 255:
	348	return 0;
	349	}
	350	/* reject packets with broadcast on source */
91447636	351	lck_mtx_lock(rt_mtx);
9bccf70c A	352	for (ia4 = TAILQ_FIRST(&in_ifaddrhead); ia4;
	353	ia4 = TAILQ_NEXT(ia4, ia_link))
	354	{
	355	if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
	356	continue;
91447636 A	357	if (ip.ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr) {
91447636 A	358	lck_mtx_unlock(rt_mtx);
9bccf70c	359	return 0;
91447636	360	}
9bccf70c	361	}
91447636	362	lck_mtx_unlock(rt_mtx);
1c79356b	363
9bccf70c A	364	/* ingress filters on outer source */
	365	if ((sc->gif_if.if_flags & IFF_LINK2) == 0 &&
	366	(m->m_flags & M_PKTHDR) != 0 && m->m_pkthdr.rcvif) {
	367	struct sockaddr_in sin;
	368	struct rtentry *rt;
	369
	370	bzero(&sin, sizeof(sin));
	371	sin.sin_family = AF_INET;
	372	sin.sin_len = sizeof(struct sockaddr_in);
	373	sin.sin_addr = ip.ip_src;
	374	rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
	375	if (!rt \|\| rt->rt_ifp != m->m_pkthdr.rcvif) {
	376	#if 0
	377	log(LOG_WARNING, "%s: packet from 0x%x dropped "
	378	"due to ingress filter\n", if_name(&sc->gif_if),
	379	(u_int32_t)ntohl(sin.sin_addr.s_addr));
	380	#endif
	381	if (rt)
	382	rtfree(rt);
	383	return 0;
1c79356b	384	}
9bccf70c	385	rtfree(rt);
1c79356b A	386	}
1c79356b A	387
9bccf70c	388	return 32 * 2;
1c79356b	389	}