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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_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. 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_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	*
ff6e181a 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. Please obtain a copy of the License at
	10	* http://www.opensource.apple.com/apsl/ and read it before using this
	11	* file.
1c79356b	12	*
ff6e181a A	13	* The Original Code and all software distributed under the License are
ff6e181a A	14	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	15	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	16	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
ff6e181a A	17	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	18	* Please see the License for the specific language governing rights and
	19	* limitations under the License.
1c79356b A	20	*
	21	* @APPLE_LICENSE_HEADER_END@
	22	*/
9bccf70c	23	/* $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $ */
1c79356b A	24
	25	/*
	26	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
	27	* All rights reserved.
	28	*
	29	* Redistribution and use in source and binary forms, with or without
	30	* modification, are permitted provided that the following conditions
	31	* are met:
	32	* 1. Redistributions of source code must retain the above copyright
	33	* notice, this list of conditions and the following disclaimer.
	34	* 2. Redistributions in binary form must reproduce the above copyright
	35	* notice, this list of conditions and the following disclaimer in the
	36	* documentation and/or other materials provided with the distribution.
	37	* 3. Neither the name of the project nor the names of its contributors
	38	* may be used to endorse or promote products derived from this software
	39	* without specific prior written permission.
	40	*
	41	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	42	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	43	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	44	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	45	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	46	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	47	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	48	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	49	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	50	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	51	* SUCH DAMAGE.
	52	*/
	53
1c79356b A	54
	55	#include <sys/param.h>
	56	#include <sys/systm.h>
	57	#include <sys/socket.h>
	58	#include <sys/sockio.h>
1c79356b A	59	#include <sys/mbuf.h>
1c79356b A	60	#include <sys/errno.h>
1c79356b A	61	#include <sys/kernel.h>
1c79356b A	62	#include <sys/sysctl.h>
1c79356b	63
1c79356b	64	#include <sys/malloc.h>
1c79356b A	65
	66	#include <net/if.h>
	67	#include <net/route.h>
1c79356b A	68
	69	#include <netinet/in.h>
	70	#include <netinet/in_systm.h>
	71	#include <netinet/ip.h>
	72	#include <netinet/ip_var.h>
	73	#include <netinet/in_gif.h>
	74	#include <netinet/in_var.h>
	75	#include <netinet/ip_encap.h>
	76	#include <netinet/ip_ecn.h>
	77
	78	#if INET6
	79	#include <netinet/ip6.h>
	80	#endif
	81
	82	#if MROUTING
	83	#include <netinet/ip_mroute.h>
	84	#endif /* MROUTING */
	85
	86	#include <net/if_gif.h>
	87
1c79356b A	88	#include <net/net_osdep.h>
1c79356b A	89
9bccf70c A	90	int ip_gif_ttl = GIF_TTL;
	91	SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
	92	&ip_gif_ttl, 0, "");
1c79356b A	93
1c79356b A	94	int
91447636 A	95	in_gif_output(
	96	struct ifnet *ifp,
	97	int family,
	98	struct mbuf *m,
	99	struct rtentry *rt)
1c79356b	100	{
9bccf70c	101	struct gif_softc sc = (struct gif_softc)ifp;
1c79356b A	102	struct sockaddr_in dst = (struct sockaddr_in )&sc->gif_ro.ro_dst;
	103	struct sockaddr_in sin_src = (struct sockaddr_in )sc->gif_psrc;
	104	struct sockaddr_in sin_dst = (struct sockaddr_in )sc->gif_pdst;
	105	struct ip iphdr; /* capsule IP header, host byte ordered */
	106	int proto, error;
	107	u_int8_t tos;
	108
	109	if (sin_src == NULL \|\| sin_dst == NULL \|\|
	110	sin_src->sin_family != AF_INET \|\|
	111	sin_dst->sin_family != AF_INET) {
1c79356b A	112	m_freem(m);
	113	return EAFNOSUPPORT;
	114	}
	115
	116	switch (family) {
	117	#if INET
	118	case AF_INET:
	119	{
	120	struct ip *ip;
	121
	122	proto = IPPROTO_IPV4;
	123	if (m->m_len < sizeof(*ip)) {
	124	m = m_pullup(m, sizeof(*ip));
	125	if (!m)
	126	return ENOBUFS;
	127	}
	128	ip = mtod(m, struct ip *);
	129	tos = ip->ip_tos;
	130	break;
	131	}
	132	#endif /INET/
	133	#if INET6
	134	case AF_INET6:
	135	{
	136	struct ip6_hdr *ip6;
	137	proto = IPPROTO_IPV6;
	138	if (m->m_len < sizeof(*ip6)) {
	139	m = m_pullup(m, sizeof(*ip6));
	140	if (!m)
	141	return ENOBUFS;
	142	}
	143	ip6 = mtod(m, struct ip6_hdr *);
	144	tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
	145	break;
	146	}
	147	#endif /INET6/
	148	default:
	149	#if DEBUG
	150	printf("in_gif_output: warning: unknown family %d passed\n",
	151	family);
	152	#endif
	153	m_freem(m);
	154	return EAFNOSUPPORT;
	155	}
	156
	157	bzero(&iphdr, sizeof(iphdr));
	158	iphdr.ip_src = sin_src->sin_addr;
9bccf70c A	159	/* bidirectional configured tunnel mode */
	160	if (sin_dst->sin_addr.s_addr != INADDR_ANY)
	161	iphdr.ip_dst = sin_dst->sin_addr;
	162	else {
	163	m_freem(m);
	164	return ENETUNREACH;
1c79356b A	165	}
	166	iphdr.ip_p = proto;
	167	/* version will be set in ip_output() */
	168	iphdr.ip_ttl = ip_gif_ttl;
	169	iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
	170	if (ifp->if_flags & IFF_LINK1)
	171	ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
9bccf70c A	172	else
9bccf70c A	173	ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
1c79356b A	174
	175	/* prepend new IP header */
	176	M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
	177	if (m && m->m_len < sizeof(struct ip))
	178	m = m_pullup(m, sizeof(struct ip));
	179	if (m == NULL) {
	180	printf("ENOBUFS in in_gif_output %d\n", __LINE__);
	181	return ENOBUFS;
	182	}
9bccf70c	183	bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
1c79356b A	184
	185	if (dst->sin_family != sin_dst->sin_family \|\|
	186	dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
	187	/* cache route doesn't match */
	188	dst->sin_family = sin_dst->sin_family;
	189	dst->sin_len = sizeof(struct sockaddr_in);
	190	dst->sin_addr = sin_dst->sin_addr;
	191	if (sc->gif_ro.ro_rt) {
9bccf70c	192	rtfree(sc->gif_ro.ro_rt);
1c79356b A	193	sc->gif_ro.ro_rt = NULL;
	194	}
	195	#if 0
	196	sc->gif_if.if_mtu = GIF_MTU;
	197	#endif
	198	}
	199
	200	if (sc->gif_ro.ro_rt == NULL) {
	201	rtalloc(&sc->gif_ro);
	202	if (sc->gif_ro.ro_rt == NULL) {
	203	m_freem(m);
	204	return ENETUNREACH;
	205	}
9bccf70c A	206
	207	/* if it constitutes infinite encapsulation, punt. */
	208	if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
	209	m_freem(m);
	210	return ENETUNREACH; /XXX/
	211	}
1c79356b A	212	#if 0
	213	ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
	214	- sizeof(struct ip);
	215	#endif
	216	}
	217
1c79356b	218	error = ip_output(m, NULL, &sc->gif_ro, 0, NULL);
1c79356b A	219	return(error);
	220	}
	221
	222	void
	223	in_gif_input(m, off)
	224	struct mbuf *m;
	225	int off;
	226	{
1c79356b A	227	struct ifnet *gifp = NULL;
	228	struct ip *ip;
	229	int i, af, proto;
	230	u_int8_t otos;
	231
1c79356b	232	ip = mtod(m, struct ip *);
9bccf70c	233	proto = ip->ip_p;
1c79356b	234
1c79356b	235
1c79356b	236	gifp = (struct ifnet *)encap_getarg(m);
1c79356b	237
9bccf70c	238	if (gifp == NULL \|\| (gifp->if_flags & IFF_UP) == 0) {
1c79356b A	239	m_freem(m);
	240	ipstat.ips_nogif++;
	241	return;
	242	}
	243
	244	otos = ip->ip_tos;
	245	m_adj(m, off);
	246
	247	switch (proto) {
	248	#if INET
	249	case IPPROTO_IPV4:
	250	{
	251	struct ip *ip;
	252	af = AF_INET;
	253	if (m->m_len < sizeof(*ip)) {
	254	m = m_pullup(m, sizeof(*ip));
	255	if (!m)
	256	return;
	257	}
	258	ip = mtod(m, struct ip *);
	259	if (gifp->if_flags & IFF_LINK1)
	260	ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
9bccf70c A	261	else
9bccf70c A	262	ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
1c79356b A	263	break;
	264	}
	265	#endif
	266	#if INET6
	267	case IPPROTO_IPV6:
	268	{
	269	struct ip6_hdr *ip6;
	270	u_int8_t itos;
	271	af = AF_INET6;
	272	if (m->m_len < sizeof(*ip6)) {
	273	m = m_pullup(m, sizeof(*ip6));
	274	if (!m)
	275	return;
	276	}
	277	ip6 = mtod(m, struct ip6_hdr *);
	278	itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
	279	if (gifp->if_flags & IFF_LINK1)
	280	ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
9bccf70c A	281	else
9bccf70c A	282	ip_ecn_egress(ECN_NOCARE, &otos, &itos);
1c79356b A	283	ip6->ip6_flow &= ~htonl(0xff << 20);
	284	ip6->ip6_flow \|= htonl((u_int32_t)itos << 20);
	285	break;
	286	}
	287	#endif /* INET6 */
	288	default:
	289	ipstat.ips_nogif++;
	290	m_freem(m);
	291	return;
	292	}
9bccf70c A	293	#ifdef __APPLE__
	294	/* Should we free m if dlil_input returns an error? */
	295	if (m->m_pkthdr.rcvif) /* replace the rcvif by gifp for dlil to route it correctly */
	296	m->m_pkthdr.rcvif = gifp;
	297	dlil_input_packet(gifp, m, NULL);
	298	#else
1c79356b	299	gif_input(m, af, gifp);
9bccf70c	300	#endif
1c79356b A	301	return;
	302	}
	303
9bccf70c A	304	/*
	305	* we know that we are in IFF_UP, outer address available, and outer family
	306	* matched the physical addr family. see gif_encapcheck().
	307	*/
1c79356b	308	int
9bccf70c A	309	gif_encapcheck4(m, off, proto, arg)
	310	const struct mbuf *m;
	311	int off;
	312	int proto;
	313	void *arg;
1c79356b	314	{
9bccf70c A	315	struct ip ip;
	316	struct gif_softc *sc;
	317	struct sockaddr_in src, dst;
	318	int addrmatch;
	319	struct in_ifaddr *ia4;
	320
	321	/* sanity check done in caller */
	322	sc = (struct gif_softc *)arg;
	323	src = (struct sockaddr_in *)sc->gif_psrc;
	324	dst = (struct sockaddr_in *)sc->gif_pdst;
	325
	326	/* LINTED const cast */
	327	m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip);
	328
	329	/* check for address match */
	330	addrmatch = 0;
	331	if (src->sin_addr.s_addr == ip.ip_dst.s_addr)
	332	addrmatch \|= 1;
	333	if (dst->sin_addr.s_addr == ip.ip_src.s_addr)
	334	addrmatch \|= 2;
	335	if (addrmatch != 3)
	336	return 0;
	337
	338	/* martian filters on outer source - NOT done in ip_input! */
	339	if (IN_MULTICAST(ntohl(ip.ip_src.s_addr)))
	340	return 0;
	341	switch ((ntohl(ip.ip_src.s_addr) & 0xff000000) >> 24) {
	342	case 0: case 127: case 255:
	343	return 0;
	344	}
	345	/* reject packets with broadcast on source */
91447636	346	lck_mtx_lock(rt_mtx);
9bccf70c A	347	for (ia4 = TAILQ_FIRST(&in_ifaddrhead); ia4;
	348	ia4 = TAILQ_NEXT(ia4, ia_link))
	349	{
	350	if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
	351	continue;
91447636 A	352	if (ip.ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr) {
91447636 A	353	lck_mtx_unlock(rt_mtx);
9bccf70c	354	return 0;
91447636	355	}
9bccf70c	356	}
91447636	357	lck_mtx_unlock(rt_mtx);
1c79356b	358
9bccf70c A	359	/* ingress filters on outer source */
	360	if ((sc->gif_if.if_flags & IFF_LINK2) == 0 &&
	361	(m->m_flags & M_PKTHDR) != 0 && m->m_pkthdr.rcvif) {
	362	struct sockaddr_in sin;
	363	struct rtentry *rt;
	364
	365	bzero(&sin, sizeof(sin));
	366	sin.sin_family = AF_INET;
	367	sin.sin_len = sizeof(struct sockaddr_in);
	368	sin.sin_addr = ip.ip_src;
	369	rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
	370	if (!rt \|\| rt->rt_ifp != m->m_pkthdr.rcvif) {
	371	#if 0
	372	log(LOG_WARNING, "%s: packet from 0x%x dropped "
	373	"due to ingress filter\n", if_name(&sc->gif_if),
	374	(u_int32_t)ntohl(sin.sin_addr.s_addr));
	375	#endif
	376	if (rt)
	377	rtfree(rt);
	378	return 0;
1c79356b	379	}
9bccf70c	380	rtfree(rt);
1c79356b A	381	}
1c79356b A	382
9bccf70c	383	return 32 * 2;
1c79356b	384	}