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

/*
 * Copyright (c) 2000-2007 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@
 */
/*	$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 <libkern/OSAtomic.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>

extern u_long  route_generation;

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,
	__unused struct rtentry *rt)
{
	struct gif_softc *sc = ifnet_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 (mbuf_len(m) < 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 (mbuf_len(m) < 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 && mbuf_len(m) < 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 ||
	    (sc->gif_ro.ro_rt != NULL &&
	    (sc->gif_ro.ro_rt->generation_id != route_generation ||
	    sc->gif_ro.ro_rt->rt_ifp == ifp))) {
		/* 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, NULL);
	return(error);
}

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

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


	gifp = ((struct gif_softc*)encap_getarg(m))->gif_if;

	if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
		m_freem(m);
		OSAddAtomic(1, (SInt32*)&ipstat.ips_nogif);
		return;
	}

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

	switch (proto) {
#if INET
	case IPPROTO_IPV4:
	    {
		af = AF_INET;
		if (mbuf_len(m) < 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 (mbuf_len(m) < 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:
		OSAddAtomic(1, (SInt32*)&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;
	ifnet_input(gifp, m, NULL);
#else
	gif_input(m, af, gifp);
#endif
	return;
}

static __inline__ void*
_cast_non_const(const void * ptr) {
	union {
		const void*		cval;
		void*			val;
	} ret;
	
	ret.cval = ptr;
	return (ret.val);
}

/*
 * 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(
	const struct mbuf *m,
	__unused int off,
	__unused 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;

	mbuf_copydata(m, 0, sizeof(ip), &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 ((ifnet_flags(ia4->ia_ifa.ifa_ifp) & 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 ((ifnet_flags(sc->gif_if) & 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	/*
2d21ac55	2	* Copyright (c) 2000-2007 Apple Inc. All rights reserved.
5d5c5d0d	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
2d21ac55 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.
8f6c56a5	14	*
2d21ac55 A	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
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	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.
8f6c56a5	25	*
2d21ac55	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>
2d21ac55	70	#include <libkern/OSAtomic.h>
1c79356b A	71
	72	#include <net/if.h>
	73	#include <net/route.h>
1c79356b A	74
	75	#include <netinet/in.h>
	76	#include <netinet/in_systm.h>
	77	#include <netinet/ip.h>
	78	#include <netinet/ip_var.h>
	79	#include <netinet/in_gif.h>
	80	#include <netinet/in_var.h>
	81	#include <netinet/ip_encap.h>
	82	#include <netinet/ip_ecn.h>
	83
	84	#if INET6
	85	#include <netinet/ip6.h>
	86	#endif
	87
	88	#if MROUTING
	89	#include <netinet/ip_mroute.h>
	90	#endif /* MROUTING */
	91
	92	#include <net/if_gif.h>
	93
1c79356b A	94	#include <net/net_osdep.h>
1c79356b A	95
935ed37a A	96	extern u_long route_generation;
935ed37a A	97
9bccf70c A	98	int ip_gif_ttl = GIF_TTL;
	99	SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
	100	&ip_gif_ttl, 0, "");
1c79356b A	101
1c79356b A	102	int
91447636 A	103	in_gif_output(
	104	struct ifnet *ifp,
	105	int family,
	106	struct mbuf *m,
2d21ac55	107	__unused struct rtentry *rt)
1c79356b	108	{
2d21ac55	109	struct gif_softc *sc = ifnet_softc(ifp);
1c79356b A	110	struct sockaddr_in dst = (struct sockaddr_in )&sc->gif_ro.ro_dst;
	111	struct sockaddr_in sin_src = (struct sockaddr_in )sc->gif_psrc;
	112	struct sockaddr_in sin_dst = (struct sockaddr_in )sc->gif_pdst;
	113	struct ip iphdr; /* capsule IP header, host byte ordered */
	114	int proto, error;
	115	u_int8_t tos;
	116
	117	if (sin_src == NULL \|\| sin_dst == NULL \|\|
	118	sin_src->sin_family != AF_INET \|\|
	119	sin_dst->sin_family != AF_INET) {
1c79356b A	120	m_freem(m);
	121	return EAFNOSUPPORT;
	122	}
	123
	124	switch (family) {
	125	#if INET
	126	case AF_INET:
	127	{
	128	struct ip *ip;
	129
	130	proto = IPPROTO_IPV4;
2d21ac55	131	if (mbuf_len(m) < sizeof(*ip)) {
1c79356b A	132	m = m_pullup(m, sizeof(*ip));
	133	if (!m)
	134	return ENOBUFS;
	135	}
	136	ip = mtod(m, struct ip *);
	137	tos = ip->ip_tos;
	138	break;
	139	}
	140	#endif /INET/
	141	#if INET6
	142	case AF_INET6:
	143	{
	144	struct ip6_hdr *ip6;
	145	proto = IPPROTO_IPV6;
2d21ac55	146	if (mbuf_len(m) < sizeof(*ip6)) {
1c79356b A	147	m = m_pullup(m, sizeof(*ip6));
	148	if (!m)
	149	return ENOBUFS;
	150	}
	151	ip6 = mtod(m, struct ip6_hdr *);
	152	tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
	153	break;
	154	}
	155	#endif /INET6/
	156	default:
	157	#if DEBUG
	158	printf("in_gif_output: warning: unknown family %d passed\n",
	159	family);
	160	#endif
	161	m_freem(m);
	162	return EAFNOSUPPORT;
	163	}
	164
	165	bzero(&iphdr, sizeof(iphdr));
	166	iphdr.ip_src = sin_src->sin_addr;
9bccf70c A	167	/* bidirectional configured tunnel mode */
	168	if (sin_dst->sin_addr.s_addr != INADDR_ANY)
	169	iphdr.ip_dst = sin_dst->sin_addr;
	170	else {
	171	m_freem(m);
	172	return ENETUNREACH;
1c79356b A	173	}
	174	iphdr.ip_p = proto;
	175	/* version will be set in ip_output() */
	176	iphdr.ip_ttl = ip_gif_ttl;
	177	iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
	178	if (ifp->if_flags & IFF_LINK1)
	179	ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
9bccf70c A	180	else
9bccf70c A	181	ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
1c79356b A	182
	183	/* prepend new IP header */
	184	M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
2d21ac55	185	if (m && mbuf_len(m) < sizeof(struct ip))
1c79356b A	186	m = m_pullup(m, sizeof(struct ip));
	187	if (m == NULL) {
	188	printf("ENOBUFS in in_gif_output %d\n", __LINE__);
	189	return ENOBUFS;
	190	}
9bccf70c	191	bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
1c79356b A	192
1c79356b A	193	if (dst->sin_family != sin_dst->sin_family \|\|
935ed37a A	194	dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr \|\|
	195	(sc->gif_ro.ro_rt != NULL &&
	196	(sc->gif_ro.ro_rt->generation_id != route_generation \|\|
	197	sc->gif_ro.ro_rt->rt_ifp == ifp))) {
1c79356b A	198	/* cache route doesn't match */
	199	dst->sin_family = sin_dst->sin_family;
	200	dst->sin_len = sizeof(struct sockaddr_in);
	201	dst->sin_addr = sin_dst->sin_addr;
	202	if (sc->gif_ro.ro_rt) {
9bccf70c	203	rtfree(sc->gif_ro.ro_rt);
1c79356b A	204	sc->gif_ro.ro_rt = NULL;
	205	}
	206	#if 0
	207	sc->gif_if.if_mtu = GIF_MTU;
	208	#endif
	209	}
	210
	211	if (sc->gif_ro.ro_rt == NULL) {
	212	rtalloc(&sc->gif_ro);
	213	if (sc->gif_ro.ro_rt == NULL) {
	214	m_freem(m);
	215	return ENETUNREACH;
	216	}
9bccf70c A	217
	218	/* if it constitutes infinite encapsulation, punt. */
	219	if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
	220	m_freem(m);
	221	return ENETUNREACH; /XXX/
	222	}
1c79356b A	223	#if 0
	224	ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
	225	- sizeof(struct ip);
	226	#endif
	227	}
	228
2d21ac55	229	error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
1c79356b A	230	return(error);
	231	}
	232
	233	void
	234	in_gif_input(m, off)
	235	struct mbuf *m;
	236	int off;
	237	{
1c79356b A	238	struct ifnet *gifp = NULL;
1c79356b A	239	struct ip *ip;
2d21ac55	240	int af, proto;
1c79356b A	241	u_int8_t otos;
1c79356b A	242
1c79356b	243	ip = mtod(m, struct ip *);
9bccf70c	244	proto = ip->ip_p;
1c79356b	245
1c79356b	246
2d21ac55	247	gifp = ((struct gif_softc*)encap_getarg(m))->gif_if;
1c79356b	248
9bccf70c	249	if (gifp == NULL \|\| (gifp->if_flags & IFF_UP) == 0) {
1c79356b	250	m_freem(m);
2d21ac55	251	OSAddAtomic(1, (SInt32*)&ipstat.ips_nogif);
1c79356b A	252	return;
	253	}
	254
	255	otos = ip->ip_tos;
	256	m_adj(m, off);
	257
	258	switch (proto) {
	259	#if INET
	260	case IPPROTO_IPV4:
	261	{
1c79356b	262	af = AF_INET;
2d21ac55	263	if (mbuf_len(m) < sizeof(*ip)) {
1c79356b A	264	m = m_pullup(m, sizeof(*ip));
	265	if (!m)
	266	return;
	267	}
	268	ip = mtod(m, struct ip *);
	269	if (gifp->if_flags & IFF_LINK1)
	270	ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
9bccf70c A	271	else
9bccf70c A	272	ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
1c79356b A	273	break;
	274	}
	275	#endif
	276	#if INET6
	277	case IPPROTO_IPV6:
	278	{
	279	struct ip6_hdr *ip6;
	280	u_int8_t itos;
	281	af = AF_INET6;
2d21ac55	282	if (mbuf_len(m) < sizeof(*ip6)) {
1c79356b A	283	m = m_pullup(m, sizeof(*ip6));
	284	if (!m)
	285	return;
	286	}
	287	ip6 = mtod(m, struct ip6_hdr *);
	288	itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
	289	if (gifp->if_flags & IFF_LINK1)
	290	ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
9bccf70c A	291	else
9bccf70c A	292	ip_ecn_egress(ECN_NOCARE, &otos, &itos);
1c79356b A	293	ip6->ip6_flow &= ~htonl(0xff << 20);
	294	ip6->ip6_flow \|= htonl((u_int32_t)itos << 20);
	295	break;
	296	}
	297	#endif /* INET6 */
	298	default:
2d21ac55	299	OSAddAtomic(1, (SInt32*)&ipstat.ips_nogif);
1c79356b A	300	m_freem(m);
	301	return;
	302	}
9bccf70c A	303	#ifdef __APPLE__
	304	/* Should we free m if dlil_input returns an error? */
	305	if (m->m_pkthdr.rcvif) /* replace the rcvif by gifp for dlil to route it correctly */
	306	m->m_pkthdr.rcvif = gifp;
2d21ac55	307	ifnet_input(gifp, m, NULL);
9bccf70c	308	#else
1c79356b	309	gif_input(m, af, gifp);
9bccf70c	310	#endif
1c79356b A	311	return;
	312	}
	313
2d21ac55 A	314	static __inline__ void*
	315	_cast_non_const(const void * ptr) {
	316	union {
	317	const void* cval;
	318	void* val;
	319	} ret;
	320
	321	ret.cval = ptr;
	322	return (ret.val);
	323	}
	324
9bccf70c A	325	/*
	326	* we know that we are in IFF_UP, outer address available, and outer family
	327	* matched the physical addr family. see gif_encapcheck().
	328	*/
1c79356b	329	int
2d21ac55 A	330	gif_encapcheck4(
	331	const struct mbuf *m,
	332	__unused int off,
	333	__unused int proto,
	334	void *arg)
1c79356b	335	{
9bccf70c A	336	struct ip ip;
	337	struct gif_softc *sc;
	338	struct sockaddr_in src, dst;
	339	int addrmatch;
	340	struct in_ifaddr *ia4;
	341
	342	/* sanity check done in caller */
	343	sc = (struct gif_softc *)arg;
	344	src = (struct sockaddr_in *)sc->gif_psrc;
	345	dst = (struct sockaddr_in *)sc->gif_pdst;
	346
2d21ac55	347	mbuf_copydata(m, 0, sizeof(ip), &ip);
9bccf70c A	348
	349	/* check for address match */
	350	addrmatch = 0;
	351	if (src->sin_addr.s_addr == ip.ip_dst.s_addr)
	352	addrmatch \|= 1;
	353	if (dst->sin_addr.s_addr == ip.ip_src.s_addr)
	354	addrmatch \|= 2;
	355	if (addrmatch != 3)
	356	return 0;
	357
	358	/* martian filters on outer source - NOT done in ip_input! */
	359	if (IN_MULTICAST(ntohl(ip.ip_src.s_addr)))
	360	return 0;
	361	switch ((ntohl(ip.ip_src.s_addr) & 0xff000000) >> 24) {
	362	case 0: case 127: case 255:
	363	return 0;
	364	}
	365	/* reject packets with broadcast on source */
91447636	366	lck_mtx_lock(rt_mtx);
9bccf70c A	367	for (ia4 = TAILQ_FIRST(&in_ifaddrhead); ia4;
	368	ia4 = TAILQ_NEXT(ia4, ia_link))
	369	{
2d21ac55	370	if ((ifnet_flags(ia4->ia_ifa.ifa_ifp) & IFF_BROADCAST) == 0)
9bccf70c	371	continue;
91447636 A	372	if (ip.ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr) {
91447636 A	373	lck_mtx_unlock(rt_mtx);
9bccf70c	374	return 0;
91447636	375	}
9bccf70c	376	}
91447636	377	lck_mtx_unlock(rt_mtx);
1c79356b	378
9bccf70c	379	/* ingress filters on outer source */
2d21ac55	380	if ((ifnet_flags(sc->gif_if) & IFF_LINK2) == 0 &&
9bccf70c A	381	(m->m_flags & M_PKTHDR) != 0 && m->m_pkthdr.rcvif) {
	382	struct sockaddr_in sin;
	383	struct rtentry *rt;
	384
	385	bzero(&sin, sizeof(sin));
	386	sin.sin_family = AF_INET;
	387	sin.sin_len = sizeof(struct sockaddr_in);
	388	sin.sin_addr = ip.ip_src;
	389	rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
	390	if (!rt \|\| rt->rt_ifp != m->m_pkthdr.rcvif) {
	391	#if 0
	392	log(LOG_WARNING, "%s: packet from 0x%x dropped "
	393	"due to ingress filter\n", if_name(&sc->gif_if),
	394	(u_int32_t)ntohl(sin.sin_addr.s_addr));
	395	#endif
	396	if (rt)
	397	rtfree(rt);
	398	return 0;
1c79356b	399	}
9bccf70c	400	rtfree(rt);
1c79356b A	401	}
1c79356b A	402
9bccf70c	403	return 32 * 2;
1c79356b	404	}