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

/*
 * Copyright (c) 2000-2016 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

#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 | CTLFLAG_LOCKED,
	&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 *)
	    (void *)&sc->gif_ro.ro_dst;
	struct sockaddr_in *sin_src = (struct sockaddr_in *)
	    (void *)sc->gif_psrc;
	struct sockaddr_in *sin_dst = (struct sockaddr_in *)
	    (void *)sc->gif_pdst;
	struct ip iphdr;	/* capsule IP header, host byte ordered */
	int proto, error;
	u_int8_t tos;
	struct ip_out_args ipoa =
	    { IFSCOPE_NONE, { 0 }, IPOAF_SELECT_SRCIF, 0, SO_TC_UNSPEC,
	    _NET_SERVICE_TYPE_UNSPEC };

	GIF_LOCK_ASSERT(sc);

	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_NORMAL, &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, 0);
	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 (ROUTE_UNUSABLE(&sc->gif_ro) ||
	    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->rt_ifp == ifp)) {
		/* cache route doesn't match or recursive route */
		dst->sin_family = sin_dst->sin_family;
		dst->sin_len = sizeof (struct sockaddr_in);
		dst->sin_addr = sin_dst->sin_addr;
		ROUTE_RELEASE(&sc->gif_ro);
#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. */
		RT_LOCK(sc->gif_ro.ro_rt);
		if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
			RT_UNLOCK(sc->gif_ro.ro_rt);
			m_freem(m);
			return (ENETUNREACH); /* XXX */
		}
#if 0
		ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
		    - sizeof (struct ip);
#endif
		RT_UNLOCK(sc->gif_ro.ro_rt);
	}

	error = ip_output(m, NULL, &sc->gif_ro, IP_OUTARGS, NULL, &ipoa);

	return (error);
}

void
in_gif_input(struct mbuf *m, int off)
{
	struct ifnet *gifp = NULL;
	struct ip *ip;
	int af, proto;
	u_int8_t otos, old_tos;
	int egress_success = 0;
	int sum;

	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, &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) {
			old_tos = ip->ip_tos;
			egress_success = ip_ecn_egress(ECN_NORMAL, &otos, &ip->ip_tos);
			if (old_tos != ip->ip_tos) {
			    sum = ~ntohs(ip->ip_sum) & 0xffff;
			    sum += (~otos & 0xffff) + ip->ip_tos;
			    sum = (sum >> 16) + (sum & 0xffff);
			    sum += (sum >> 16);  /* add carry */
			    ip->ip_sum = htons(~sum & 0xffff);
			}
		} else
			egress_success = 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)
			egress_success = ip_ecn_egress(ECN_NORMAL, &otos, &itos);
		else
			egress_success = 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, &ipstat.ips_nogif);
		m_freem(m);
		return;
	}

	if (egress_success == 0) {
		OSAddAtomic(1, &ipstat.ips_nogif);
		m_freem(m);
		return;
	}

#ifdef __APPLE__
	/* Replace the rcvif by gifp for dlil to route it correctly */
	if (m->m_pkthdr.rcvif)
		m->m_pkthdr.rcvif = gifp;
	ifnet_input(gifp, m, NULL);
#else
	gif_input(m, af, gifp);
#endif
}

/*
 * 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 *)(void *)sc->gif_psrc;
	dst = (struct sockaddr_in *)(void *)sc->gif_pdst;

	GIF_LOCK_ASSERT(sc);

	mbuf_copydata((struct mbuf *)(size_t)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_rw_lock_shared(in_ifaddr_rwlock);
	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;
		IFA_LOCK(&ia4->ia_ifa);
		if (ip.ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr) {
			IFA_UNLOCK(&ia4->ia_ifa);
			lck_rw_done(in_ifaddr_rwlock);
			return (0);
		}
		IFA_UNLOCK(&ia4->ia_ifa);
	}
	lck_rw_done(in_ifaddr_rwlock);

	/* 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_scoped((struct sockaddr *)&sin, 0, 0,
		    m->m_pkthdr.rcvif->if_index);
		if (rt != NULL)
			RT_LOCK(rt);
		if (rt == NULL || rt->rt_ifp != m->m_pkthdr.rcvif) {
			if (rt != NULL) {
				RT_UNLOCK(rt);
				rtfree(rt);
			}
			return (0);
		}
		RT_UNLOCK(rt);
		rtfree(rt);
	}

	return (32 * 2);
}
Commit	Line	Data
1c79356b	1	/*
39037602	2	* Copyright (c) 2000-2016 Apple Inc. All rights reserved.
5d5c5d0d	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
39236c6e	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.
39236c6e	14	*
2d21ac55 A	15	* Please obtain a copy of the License at
2d21ac55 A	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
39236c6e	17	*
2d21ac55 A	18	* The Original Code and all software distributed under the License are
2d21ac55 A	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.
39236c6e	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b	27	*/
39236c6e	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
39236c6e	88	#include <net/if_gif.h>
1c79356b	89
1c79356b A	90	#include <net/net_osdep.h>
1c79356b A	91
9bccf70c	92	int ip_gif_ttl = GIF_TTL;
6d2010ae	93	SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW \| CTLFLAG_LOCKED,
9bccf70c	94	&ip_gif_ttl, 0, "");
1c79356b A	95
1c79356b A	96	int
91447636 A	97	in_gif_output(
	98	struct ifnet *ifp,
	99	int family,
	100	struct mbuf *m,
2d21ac55	101	__unused struct rtentry *rt)
1c79356b	102	{
2d21ac55	103	struct gif_softc *sc = ifnet_softc(ifp);
39236c6e A	104	struct sockaddr_in dst = (struct sockaddr_in )
	105	(void *)&sc->gif_ro.ro_dst;
	106	struct sockaddr_in sin_src = (struct sockaddr_in )
	107	(void *)sc->gif_psrc;
	108	struct sockaddr_in sin_dst = (struct sockaddr_in )
	109	(void *)sc->gif_pdst;
1c79356b A	110	struct ip iphdr; /* capsule IP header, host byte ordered */
	111	int proto, error;
	112	u_int8_t tos;
39236c6e	113	struct ip_out_args ipoa =
39037602 A	114	{ IFSCOPE_NONE, { 0 }, IPOAF_SELECT_SRCIF, 0, SO_TC_UNSPEC,
39037602 A	115	_NET_SERVICE_TYPE_UNSPEC };
39236c6e A	116
39236c6e A	117	GIF_LOCK_ASSERT(sc);
1c79356b A	118
	119	if (sin_src == NULL \|\| sin_dst == NULL \|\|
	120	sin_src->sin_family != AF_INET \|\|
	121	sin_dst->sin_family != AF_INET) {
1c79356b	122	m_freem(m);
39236c6e	123	return (EAFNOSUPPORT);
1c79356b A	124	}
	125
	126	switch (family) {
	127	#if INET
	128	case AF_INET:
	129	{
	130	struct ip *ip;
	131
	132	proto = IPPROTO_IPV4;
39236c6e A	133	if (mbuf_len(m) < sizeof (*ip)) {
39236c6e A	134	m = m_pullup(m, sizeof (*ip));
1c79356b	135	if (!m)
39236c6e	136	return (ENOBUFS);
1c79356b A	137	}
	138	ip = mtod(m, struct ip *);
	139	tos = ip->ip_tos;
	140	break;
	141	}
39236c6e	142	#endif /* INET */
1c79356b A	143	#if INET6
	144	case AF_INET6:
	145	{
	146	struct ip6_hdr *ip6;
	147	proto = IPPROTO_IPV6;
39236c6e A	148	if (mbuf_len(m) < sizeof (*ip6)) {
39236c6e A	149	m = m_pullup(m, sizeof (*ip6));
1c79356b	150	if (!m)
39236c6e	151	return (ENOBUFS);
1c79356b A	152	}
	153	ip6 = mtod(m, struct ip6_hdr *);
	154	tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
	155	break;
	156	}
39236c6e	157	#endif /* INET6 */
1c79356b A	158	default:
	159	#if DEBUG
	160	printf("in_gif_output: warning: unknown family %d passed\n",
	161	family);
	162	#endif
	163	m_freem(m);
39236c6e	164	return (EAFNOSUPPORT);
1c79356b A	165	}
1c79356b A	166
39236c6e	167	bzero(&iphdr, sizeof (iphdr));
1c79356b	168	iphdr.ip_src = sin_src->sin_addr;
9bccf70c A	169	/* bidirectional configured tunnel mode */
	170	if (sin_dst->sin_addr.s_addr != INADDR_ANY)
	171	iphdr.ip_dst = sin_dst->sin_addr;
	172	else {
	173	m_freem(m);
39236c6e	174	return (ENETUNREACH);
1c79356b A	175	}
	176	iphdr.ip_p = proto;
	177	/* version will be set in ip_output() */
	178	iphdr.ip_ttl = ip_gif_ttl;
39236c6e	179	iphdr.ip_len = m->m_pkthdr.len + sizeof (struct ip);
1c79356b	180	if (ifp->if_flags & IFF_LINK1)
3e170ce0	181	ip_ecn_ingress(ECN_NORMAL, &iphdr.ip_tos, &tos);
9bccf70c A	182	else
9bccf70c A	183	ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
1c79356b A	184
1c79356b A	185	/* prepend new IP header */
3e170ce0	186	M_PREPEND(m, sizeof (struct ip), M_DONTWAIT, 0);
39236c6e A	187	if (m && mbuf_len(m) < sizeof (struct ip))
39236c6e A	188	m = m_pullup(m, sizeof (struct ip));
1c79356b A	189	if (m == NULL) {
1c79356b A	190	printf("ENOBUFS in in_gif_output %d\n", __LINE__);
39236c6e	191	return (ENOBUFS);
1c79356b	192	}
39236c6e	193	bcopy(&iphdr, mtod(m, struct ip *), sizeof (struct ip));
1c79356b	194
39236c6e A	195	if (ROUTE_UNUSABLE(&sc->gif_ro) \|\|
39236c6e A	196	dst->sin_family != sin_dst->sin_family \|\|
935ed37a	197	dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr \|\|
39236c6e	198	(sc->gif_ro.ro_rt != NULL && sc->gif_ro.ro_rt->rt_ifp == ifp)) {
b0d623f7	199	/* cache route doesn't match or recursive route */
1c79356b	200	dst->sin_family = sin_dst->sin_family;
39236c6e	201	dst->sin_len = sizeof (struct sockaddr_in);
1c79356b	202	dst->sin_addr = sin_dst->sin_addr;
39236c6e	203	ROUTE_RELEASE(&sc->gif_ro);
1c79356b A	204	#if 0
	205	sc->gif_if.if_mtu = GIF_MTU;
	206	#endif
	207	}
	208
	209	if (sc->gif_ro.ro_rt == NULL) {
	210	rtalloc(&sc->gif_ro);
	211	if (sc->gif_ro.ro_rt == NULL) {
	212	m_freem(m);
39236c6e	213	return (ENETUNREACH);
1c79356b	214	}
9bccf70c A	215
9bccf70c A	216	/* if it constitutes infinite encapsulation, punt. */
b0d623f7	217	RT_LOCK(sc->gif_ro.ro_rt);
9bccf70c	218	if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
b0d623f7	219	RT_UNLOCK(sc->gif_ro.ro_rt);
9bccf70c	220	m_freem(m);
39236c6e	221	return (ENETUNREACH); /* XXX */
9bccf70c	222	}
1c79356b A	223	#if 0
1c79356b A	224	ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
39236c6e	225	- sizeof (struct ip);
1c79356b	226	#endif
b0d623f7	227	RT_UNLOCK(sc->gif_ro.ro_rt);
1c79356b A	228	}
1c79356b A	229
c910b4d9	230	error = ip_output(m, NULL, &sc->gif_ro, IP_OUTARGS, NULL, &ipoa);
39236c6e A	231
39236c6e A	232	return (error);
1c79356b A	233	}
	234
	235	void
39037602	236	in_gif_input(struct mbuf *m, int off)
1c79356b	237	{
1c79356b A	238	struct ifnet *gifp = NULL;
1c79356b A	239	struct ip *ip;
2d21ac55	240	int af, proto;
4bd07ac2	241	u_int8_t otos, old_tos;
3e170ce0	242	int egress_success = 0;
4bd07ac2	243	int sum;
1c79356b	244
1c79356b	245	ip = mtod(m, struct ip *);
9bccf70c	246	proto = ip->ip_p;
1c79356b	247
1c79356b	248
39236c6e	249	gifp = ((struct gif_softc *)encap_getarg(m))->gif_if;
1c79356b	250
9bccf70c	251	if (gifp == NULL \|\| (gifp->if_flags & IFF_UP) == 0) {
1c79356b	252	m_freem(m);
b0d623f7	253	OSAddAtomic(1, &ipstat.ips_nogif);
1c79356b A	254	return;
	255	}
	256
	257	otos = ip->ip_tos;
	258	m_adj(m, off);
	259
	260	switch (proto) {
	261	#if INET
	262	case IPPROTO_IPV4:
	263	{
1c79356b	264	af = AF_INET;
39236c6e A	265	if (mbuf_len(m) < sizeof (*ip)) {
39236c6e A	266	m = m_pullup(m, sizeof (*ip));
1c79356b A	267	if (!m)
	268	return;
	269	}
	270	ip = mtod(m, struct ip *);
4bd07ac2 A	271	if (gifp->if_flags & IFF_LINK1) {
4bd07ac2 A	272	old_tos = ip->ip_tos;
3e170ce0	273	egress_success = ip_ecn_egress(ECN_NORMAL, &otos, &ip->ip_tos);
4bd07ac2 A	274	if (old_tos != ip->ip_tos) {
	275	sum = ~ntohs(ip->ip_sum) & 0xffff;
	276	sum += (~otos & 0xffff) + ip->ip_tos;
	277	sum = (sum >> 16) + (sum & 0xffff);
	278	sum += (sum >> 16); /* add carry */
	279	ip->ip_sum = htons(~sum & 0xffff);
	280	}
	281	} else
3e170ce0	282	egress_success = ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
1c79356b A	283	break;
	284	}
	285	#endif
	286	#if INET6
	287	case IPPROTO_IPV6:
	288	{
	289	struct ip6_hdr *ip6;
	290	u_int8_t itos;
	291	af = AF_INET6;
39236c6e A	292	if (mbuf_len(m) < sizeof (*ip6)) {
39236c6e A	293	m = m_pullup(m, sizeof (*ip6));
1c79356b A	294	if (!m)
	295	return;
	296	}
	297	ip6 = mtod(m, struct ip6_hdr *);
	298	itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
	299	if (gifp->if_flags & IFF_LINK1)
3e170ce0	300	egress_success = ip_ecn_egress(ECN_NORMAL, &otos, &itos);
9bccf70c	301	else
3e170ce0	302	egress_success = ip_ecn_egress(ECN_NOCARE, &otos, &itos);
1c79356b A	303	ip6->ip6_flow &= ~htonl(0xff << 20);
	304	ip6->ip6_flow \|= htonl((u_int32_t)itos << 20);
	305	break;
	306	}
	307	#endif /* INET6 */
	308	default:
b0d623f7	309	OSAddAtomic(1, &ipstat.ips_nogif);
1c79356b A	310	m_freem(m);
	311	return;
	312	}
3e170ce0 A	313
	314	if (egress_success == 0) {
	315	OSAddAtomic(1, &ipstat.ips_nogif);
	316	m_freem(m);
	317	return;
	318	}
	319
9bccf70c	320	#ifdef __APPLE__
39236c6e A	321	/* Replace the rcvif by gifp for dlil to route it correctly */
39236c6e A	322	if (m->m_pkthdr.rcvif)
9bccf70c	323	m->m_pkthdr.rcvif = gifp;
2d21ac55	324	ifnet_input(gifp, m, NULL);
9bccf70c	325	#else
1c79356b	326	gif_input(m, af, gifp);
9bccf70c	327	#endif
2d21ac55 A	328	}
2d21ac55 A	329
9bccf70c	330	/*
39236c6e	331	* We know that we are in IFF_UP, outer address available, and outer family
9bccf70c A	332	* matched the physical addr family. see gif_encapcheck().
9bccf70c A	333	*/
1c79356b	334	int
2d21ac55 A	335	gif_encapcheck4(
	336	const struct mbuf *m,
	337	__unused int off,
	338	__unused int proto,
	339	void *arg)
1c79356b	340	{
9bccf70c A	341	struct ip ip;
	342	struct gif_softc *sc;
	343	struct sockaddr_in src, dst;
	344	int addrmatch;
	345	struct in_ifaddr *ia4;
	346
	347	/* sanity check done in caller */
	348	sc = (struct gif_softc *)arg;
316670eb A	349	src = (struct sockaddr_in )(void )sc->gif_psrc;
316670eb A	350	dst = (struct sockaddr_in )(void )sc->gif_pdst;
9bccf70c	351
39236c6e A	352	GIF_LOCK_ASSERT(sc);
	353
	354	mbuf_copydata((struct mbuf *)(size_t)m, 0, sizeof (ip), &ip);
9bccf70c A	355
	356	/* check for address match */
	357	addrmatch = 0;
	358	if (src->sin_addr.s_addr == ip.ip_dst.s_addr)
	359	addrmatch \|= 1;
	360	if (dst->sin_addr.s_addr == ip.ip_src.s_addr)
	361	addrmatch \|= 2;
	362	if (addrmatch != 3)
39236c6e	363	return (0);
9bccf70c A	364
	365	/* martian filters on outer source - NOT done in ip_input! */
	366	if (IN_MULTICAST(ntohl(ip.ip_src.s_addr)))
39236c6e	367	return (0);
9bccf70c A	368	switch ((ntohl(ip.ip_src.s_addr) & 0xff000000) >> 24) {
9bccf70c A	369	case 0: case 127: case 255:
39236c6e	370	return (0);
9bccf70c A	371	}
9bccf70c A	372	/* reject packets with broadcast on source */
b0d623f7	373	lck_rw_lock_shared(in_ifaddr_rwlock);
9bccf70c	374	for (ia4 = TAILQ_FIRST(&in_ifaddrhead); ia4;
39236c6e	375	ia4 = TAILQ_NEXT(ia4, ia_link)) {
2d21ac55	376	if ((ifnet_flags(ia4->ia_ifa.ifa_ifp) & IFF_BROADCAST) == 0)
9bccf70c	377	continue;
6d2010ae	378	IFA_LOCK(&ia4->ia_ifa);
91447636	379	if (ip.ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr) {
6d2010ae	380	IFA_UNLOCK(&ia4->ia_ifa);
b0d623f7	381	lck_rw_done(in_ifaddr_rwlock);
39236c6e	382	return (0);
91447636	383	}
6d2010ae	384	IFA_UNLOCK(&ia4->ia_ifa);
9bccf70c	385	}
b0d623f7	386	lck_rw_done(in_ifaddr_rwlock);
1c79356b	387
9bccf70c	388	/* ingress filters on outer source */
2d21ac55	389	if ((ifnet_flags(sc->gif_if) & IFF_LINK2) == 0 &&
9bccf70c A	390	(m->m_flags & M_PKTHDR) != 0 && m->m_pkthdr.rcvif) {
	391	struct sockaddr_in sin;
	392	struct rtentry *rt;
	393
39236c6e	394	bzero(&sin, sizeof (sin));
9bccf70c	395	sin.sin_family = AF_INET;
39236c6e	396	sin.sin_len = sizeof (struct sockaddr_in);
9bccf70c	397	sin.sin_addr = ip.ip_src;
b0d623f7	398	rt = rtalloc1_scoped((struct sockaddr *)&sin, 0, 0,
c910b4d9	399	m->m_pkthdr.rcvif->if_index);
b0d623f7 A	400	if (rt != NULL)
	401	RT_LOCK(rt);
	402	if (rt == NULL \|\| rt->rt_ifp != m->m_pkthdr.rcvif) {
b0d623f7 A	403	if (rt != NULL) {
b0d623f7 A	404	RT_UNLOCK(rt);
9bccf70c	405	rtfree(rt);
b0d623f7	406	}
39236c6e	407	return (0);
1c79356b	408	}
b0d623f7	409	RT_UNLOCK(rt);
9bccf70c	410	rtfree(rt);
1c79356b A	411	}
1c79356b A	412
39236c6e	413	return (32 * 2);
1c79356b	414	}