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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_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 A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
37839358 A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
1c79356b	11	*
37839358 A	12	* This Original Code and all software distributed under the License are
37839358 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
37839358 A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
9bccf70c	22	/* $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $ */
1c79356b A	23
	24	/*
	25	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
	26	* All rights reserved.
	27	*
	28	* Redistribution and use in source and binary forms, with or without
	29	* modification, are permitted provided that the following conditions
	30	* are met:
	31	* 1. Redistributions of source code must retain the above copyright
	32	* notice, this list of conditions and the following disclaimer.
	33	* 2. Redistributions in binary form must reproduce the above copyright
	34	* notice, this list of conditions and the following disclaimer in the
	35	* documentation and/or other materials provided with the distribution.
	36	* 3. Neither the name of the project nor the names of its contributors
	37	* may be used to endorse or promote products derived from this software
	38	* without specific prior written permission.
	39	*
	40	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	41	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	42	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	43	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	44	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	45	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	46	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	47	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	48	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	49	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	50	* SUCH DAMAGE.
	51	*/
	52
1c79356b A	53
	54	#include <sys/param.h>
	55	#include <sys/systm.h>
	56	#include <sys/socket.h>
	57	#include <sys/sockio.h>
1c79356b A	58	#include <sys/mbuf.h>
1c79356b A	59	#include <sys/errno.h>
1c79356b A	60	#include <sys/kernel.h>
1c79356b A	61	#include <sys/sysctl.h>
1c79356b	62
1c79356b	63	#include <sys/malloc.h>
1c79356b A	64
	65	#include <net/if.h>
	66	#include <net/route.h>
1c79356b A	67
	68	#include <netinet/in.h>
	69	#include <netinet/in_systm.h>
	70	#include <netinet/ip.h>
	71	#include <netinet/ip_var.h>
	72	#include <netinet/in_gif.h>
	73	#include <netinet/in_var.h>
	74	#include <netinet/ip_encap.h>
	75	#include <netinet/ip_ecn.h>
	76
	77	#if INET6
	78	#include <netinet/ip6.h>
	79	#endif
	80
	81	#if MROUTING
	82	#include <netinet/ip_mroute.h>
	83	#endif /* MROUTING */
	84
	85	#include <net/if_gif.h>
	86
1c79356b A	87	#include <net/net_osdep.h>
1c79356b A	88
9bccf70c A	89	int ip_gif_ttl = GIF_TTL;
	90	SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
	91	&ip_gif_ttl, 0, "");
1c79356b A	92
1c79356b A	93	int
91447636 A	94	in_gif_output(
	95	struct ifnet *ifp,
	96	int family,
	97	struct mbuf *m,
	98	struct rtentry *rt)
1c79356b	99	{
9bccf70c	100	struct gif_softc sc = (struct gif_softc)ifp;
1c79356b A	101	struct sockaddr_in dst = (struct sockaddr_in )&sc->gif_ro.ro_dst;
	102	struct sockaddr_in sin_src = (struct sockaddr_in )sc->gif_psrc;
	103	struct sockaddr_in sin_dst = (struct sockaddr_in )sc->gif_pdst;
	104	struct ip iphdr; /* capsule IP header, host byte ordered */
	105	int proto, error;
	106	u_int8_t tos;
	107
	108	if (sin_src == NULL \|\| sin_dst == NULL \|\|
	109	sin_src->sin_family != AF_INET \|\|
	110	sin_dst->sin_family != AF_INET) {
1c79356b A	111	m_freem(m);
	112	return EAFNOSUPPORT;
	113	}
	114
	115	switch (family) {
	116	#if INET
	117	case AF_INET:
	118	{
	119	struct ip *ip;
	120
	121	proto = IPPROTO_IPV4;
	122	if (m->m_len < sizeof(*ip)) {
	123	m = m_pullup(m, sizeof(*ip));
	124	if (!m)
	125	return ENOBUFS;
	126	}
	127	ip = mtod(m, struct ip *);
	128	tos = ip->ip_tos;
	129	break;
	130	}
	131	#endif /INET/
	132	#if INET6
	133	case AF_INET6:
	134	{
	135	struct ip6_hdr *ip6;
	136	proto = IPPROTO_IPV6;
	137	if (m->m_len < sizeof(*ip6)) {
	138	m = m_pullup(m, sizeof(*ip6));
	139	if (!m)
	140	return ENOBUFS;
	141	}
	142	ip6 = mtod(m, struct ip6_hdr *);
	143	tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
	144	break;
	145	}
	146	#endif /INET6/
	147	default:
	148	#if DEBUG
	149	printf("in_gif_output: warning: unknown family %d passed\n",
	150	family);
	151	#endif
	152	m_freem(m);
	153	return EAFNOSUPPORT;
	154	}
	155
	156	bzero(&iphdr, sizeof(iphdr));
	157	iphdr.ip_src = sin_src->sin_addr;
9bccf70c A	158	/* bidirectional configured tunnel mode */
	159	if (sin_dst->sin_addr.s_addr != INADDR_ANY)
	160	iphdr.ip_dst = sin_dst->sin_addr;
	161	else {
	162	m_freem(m);
	163	return ENETUNREACH;
1c79356b A	164	}
	165	iphdr.ip_p = proto;
	166	/* version will be set in ip_output() */
	167	iphdr.ip_ttl = ip_gif_ttl;
	168	iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
	169	if (ifp->if_flags & IFF_LINK1)
	170	ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
9bccf70c A	171	else
9bccf70c A	172	ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
1c79356b A	173
	174	/* prepend new IP header */
	175	M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
	176	if (m && m->m_len < sizeof(struct ip))
	177	m = m_pullup(m, sizeof(struct ip));
	178	if (m == NULL) {
	179	printf("ENOBUFS in in_gif_output %d\n", __LINE__);
	180	return ENOBUFS;
	181	}
9bccf70c	182	bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
1c79356b A	183
	184	if (dst->sin_family != sin_dst->sin_family \|\|
	185	dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
	186	/* cache route doesn't match */
	187	dst->sin_family = sin_dst->sin_family;
	188	dst->sin_len = sizeof(struct sockaddr_in);
	189	dst->sin_addr = sin_dst->sin_addr;
	190	if (sc->gif_ro.ro_rt) {
9bccf70c	191	rtfree(sc->gif_ro.ro_rt);
1c79356b A	192	sc->gif_ro.ro_rt = NULL;
	193	}
	194	#if 0
	195	sc->gif_if.if_mtu = GIF_MTU;
	196	#endif
	197	}
	198
	199	if (sc->gif_ro.ro_rt == NULL) {
	200	rtalloc(&sc->gif_ro);
	201	if (sc->gif_ro.ro_rt == NULL) {
	202	m_freem(m);
	203	return ENETUNREACH;
	204	}
9bccf70c A	205
	206	/* if it constitutes infinite encapsulation, punt. */
	207	if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
	208	m_freem(m);
	209	return ENETUNREACH; /XXX/
	210	}
1c79356b A	211	#if 0
	212	ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
	213	- sizeof(struct ip);
	214	#endif
	215	}
	216
1c79356b	217	error = ip_output(m, NULL, &sc->gif_ro, 0, NULL);
1c79356b A	218	return(error);
	219	}
	220
	221	void
	222	in_gif_input(m, off)
	223	struct mbuf *m;
	224	int off;
	225	{
1c79356b A	226	struct ifnet *gifp = NULL;
	227	struct ip *ip;
	228	int i, af, proto;
	229	u_int8_t otos;
	230
1c79356b	231	ip = mtod(m, struct ip *);
9bccf70c	232	proto = ip->ip_p;
1c79356b	233
1c79356b	234
1c79356b	235	gifp = (struct ifnet *)encap_getarg(m);
1c79356b	236
9bccf70c	237	if (gifp == NULL \|\| (gifp->if_flags & IFF_UP) == 0) {
1c79356b A	238	m_freem(m);
	239	ipstat.ips_nogif++;
	240	return;
	241	}
	242
	243	otos = ip->ip_tos;
	244	m_adj(m, off);
	245
	246	switch (proto) {
	247	#if INET
	248	case IPPROTO_IPV4:
	249	{
	250	struct ip *ip;
	251	af = AF_INET;
	252	if (m->m_len < sizeof(*ip)) {
	253	m = m_pullup(m, sizeof(*ip));
	254	if (!m)
	255	return;
	256	}
	257	ip = mtod(m, struct ip *);
	258	if (gifp->if_flags & IFF_LINK1)
	259	ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
9bccf70c A	260	else
9bccf70c A	261	ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
1c79356b A	262	break;
	263	}
	264	#endif
	265	#if INET6
	266	case IPPROTO_IPV6:
	267	{
	268	struct ip6_hdr *ip6;
	269	u_int8_t itos;
	270	af = AF_INET6;
	271	if (m->m_len < sizeof(*ip6)) {
	272	m = m_pullup(m, sizeof(*ip6));
	273	if (!m)
	274	return;
	275	}
	276	ip6 = mtod(m, struct ip6_hdr *);
	277	itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
	278	if (gifp->if_flags & IFF_LINK1)
	279	ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
9bccf70c A	280	else
9bccf70c A	281	ip_ecn_egress(ECN_NOCARE, &otos, &itos);
1c79356b A	282	ip6->ip6_flow &= ~htonl(0xff << 20);
	283	ip6->ip6_flow \|= htonl((u_int32_t)itos << 20);
	284	break;
	285	}
	286	#endif /* INET6 */
	287	default:
	288	ipstat.ips_nogif++;
	289	m_freem(m);
	290	return;
	291	}
9bccf70c A	292	#ifdef __APPLE__
	293	/* Should we free m if dlil_input returns an error? */
	294	if (m->m_pkthdr.rcvif) /* replace the rcvif by gifp for dlil to route it correctly */
	295	m->m_pkthdr.rcvif = gifp;
	296	dlil_input_packet(gifp, m, NULL);
	297	#else
1c79356b	298	gif_input(m, af, gifp);
9bccf70c	299	#endif
1c79356b A	300	return;
	301	}
	302
9bccf70c A	303	/*
	304	* we know that we are in IFF_UP, outer address available, and outer family
	305	* matched the physical addr family. see gif_encapcheck().
	306	*/
1c79356b	307	int
9bccf70c A	308	gif_encapcheck4(m, off, proto, arg)
	309	const struct mbuf *m;
	310	int off;
	311	int proto;
	312	void *arg;
1c79356b	313	{
9bccf70c A	314	struct ip ip;
	315	struct gif_softc *sc;
	316	struct sockaddr_in src, dst;
	317	int addrmatch;
	318	struct in_ifaddr *ia4;
	319
	320	/* sanity check done in caller */
	321	sc = (struct gif_softc *)arg;
	322	src = (struct sockaddr_in *)sc->gif_psrc;
	323	dst = (struct sockaddr_in *)sc->gif_pdst;
	324
	325	/* LINTED const cast */
	326	m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip);
	327
	328	/* check for address match */
	329	addrmatch = 0;
	330	if (src->sin_addr.s_addr == ip.ip_dst.s_addr)
	331	addrmatch \|= 1;
	332	if (dst->sin_addr.s_addr == ip.ip_src.s_addr)
	333	addrmatch \|= 2;
	334	if (addrmatch != 3)
	335	return 0;
	336
	337	/* martian filters on outer source - NOT done in ip_input! */
	338	if (IN_MULTICAST(ntohl(ip.ip_src.s_addr)))
	339	return 0;
	340	switch ((ntohl(ip.ip_src.s_addr) & 0xff000000) >> 24) {
	341	case 0: case 127: case 255:
	342	return 0;
	343	}
	344	/* reject packets with broadcast on source */
91447636	345	lck_mtx_lock(rt_mtx);
9bccf70c A	346	for (ia4 = TAILQ_FIRST(&in_ifaddrhead); ia4;
	347	ia4 = TAILQ_NEXT(ia4, ia_link))
	348	{
	349	if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
	350	continue;
91447636 A	351	if (ip.ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr) {
91447636 A	352	lck_mtx_unlock(rt_mtx);
9bccf70c	353	return 0;
91447636	354	}
9bccf70c	355	}
91447636	356	lck_mtx_unlock(rt_mtx);
1c79356b	357
9bccf70c A	358	/* ingress filters on outer source */
	359	if ((sc->gif_if.if_flags & IFF_LINK2) == 0 &&
	360	(m->m_flags & M_PKTHDR) != 0 && m->m_pkthdr.rcvif) {
	361	struct sockaddr_in sin;
	362	struct rtentry *rt;
	363
	364	bzero(&sin, sizeof(sin));
	365	sin.sin_family = AF_INET;
	366	sin.sin_len = sizeof(struct sockaddr_in);
	367	sin.sin_addr = ip.ip_src;
	368	rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
	369	if (!rt \|\| rt->rt_ifp != m->m_pkthdr.rcvif) {
	370	#if 0
	371	log(LOG_WARNING, "%s: packet from 0x%x dropped "
	372	"due to ingress filter\n", if_name(&sc->gif_if),
	373	(u_int32_t)ntohl(sin.sin_addr.s_addr));
	374	#endif
	375	if (rt)
	376	rtfree(rt);
	377	return 0;
1c79356b	378	}
9bccf70c	379	rtfree(rt);
1c79356b A	380	}
1c79356b A	381
9bccf70c	382	return 32 * 2;
1c79356b	383	}