[apple/xnu.git] / bsd / netinet6 / in6_gif.c

/*
 * Copyright (c) 2009-2012 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@
 */

/*	$FreeBSD: src/sys/netinet6/in6_gif.c,v 1.2.2.3 2001/07/03 11:01:52 ume Exp $	*/
/*	$KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 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/queue.h>
#include <sys/syslog.h>

#include <sys/malloc.h>
#include <sys/protosw.h>

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

#include <netinet/in.h>
#include <netinet/in_systm.h>
#if INET
#include <netinet/ip.h>
#endif
#include <netinet/ip_encap.h>
#if INET6
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_gif.h>
#include <netinet6/in6_var.h>
#endif
#include <netinet/ip_ecn.h>
#if INET6
#include <netinet6/ip6_ecn.h>
#endif

#include <net/if_gif.h>

#include <net/net_osdep.h>

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

int
in6_gif_output(
	struct ifnet *ifp,
	int family, /* family of the packet to be encapsulate. */
	struct mbuf *m,
	__unused struct rtentry *rt)
{
	struct gif_softc *sc = ifnet_softc(ifp);
	struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
	struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)(void *)sc->gif_psrc;
	struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)(void *)sc->gif_pdst;
	struct ip6_hdr *ip6;
	int proto;
	u_int8_t itos, otos;

	if (sin6_src == NULL || sin6_dst == NULL ||
	    sin6_src->sin6_family != AF_INET6 ||
	    sin6_dst->sin6_family != AF_INET6) {
		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 *);
		itos = ip->ip_tos;
		break;
	    }
#endif
#if INET6
	case AF_INET6:
	    {
		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 *);
		itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
		break;
	    }
#endif
	default:
#if DEBUG
		printf("in6_gif_output: warning: unknown family %d passed\n",
			family);
#endif
		m_freem(m);
		return EAFNOSUPPORT;
	}
	
	/* prepend new IP header */
	M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
	if (m && mbuf_len(m) < sizeof(struct ip6_hdr))
		m = m_pullup(m, sizeof(struct ip6_hdr));
	if (m == NULL) {
		printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
		return ENOBUFS;
	}

	ip6 = mtod(m, struct ip6_hdr *);
	ip6->ip6_flow	= 0;
	ip6->ip6_vfc	&= ~IPV6_VERSION_MASK;
	ip6->ip6_vfc	|= IPV6_VERSION;
	ip6->ip6_plen	= htons((u_short)m->m_pkthdr.len);
	ip6->ip6_nxt	= proto;
	ip6->ip6_hlim	= ip6_gif_hlim;
	ip6->ip6_src	= sin6_src->sin6_addr;
	/* bidirectional configured tunnel mode */
	if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
		ip6->ip6_dst = sin6_dst->sin6_addr;
	else  {
		m_freem(m);
		return ENETUNREACH;
	}
	ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE,
		       &otos, &itos);
	ip6->ip6_flow &= ~htonl(0xff << 20);
	ip6->ip6_flow |= htonl((u_int32_t)otos << 20);

	if (dst->sin6_family != sin6_dst->sin6_family ||
	    !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr) ||
	    (sc->gif_ro6.ro_rt != NULL &&
	    (sc->gif_ro6.ro_rt->generation_id != route_generation ||
	    sc->gif_ro6.ro_rt->rt_ifp == ifp))) {
		/* cache route doesn't match or recursive route */
		bzero(dst, sizeof(*dst));
		dst->sin6_family = sin6_dst->sin6_family;
		dst->sin6_len = sizeof(struct sockaddr_in6);
		dst->sin6_addr = sin6_dst->sin6_addr;
		if (sc->gif_ro6.ro_rt) {
			rtfree(sc->gif_ro6.ro_rt);
			sc->gif_ro6.ro_rt = NULL;
		}
#if 0
		sc->gif_if.if_mtu = GIF_MTU;
#endif
	}

	if (sc->gif_ro6.ro_rt == NULL) {
		rtalloc((struct route *)&sc->gif_ro6);
		if (sc->gif_ro6.ro_rt == NULL) {
			m_freem(m);
			return ENETUNREACH;
		}
		RT_LOCK(sc->gif_ro6.ro_rt);
		/* if it constitutes infinite encapsulation, punt. */
		if (sc->gif_ro6.ro_rt->rt_ifp == ifp) {
			RT_UNLOCK(sc->gif_ro6.ro_rt);
			m_freem(m);
			return ENETUNREACH;	/*XXX*/
		}
#if 0
		ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
			- sizeof(struct ip6_hdr);
#endif
		RT_UNLOCK(sc->gif_ro6.ro_rt);
	}
	
#if IPV6_MINMTU
	/*
	 * force fragmentation to minimum MTU, to avoid path MTU discovery.
	 * it is too painful to ask for resend of inner packet, to achieve
	 * path MTU discovery for encapsulated packets.
	 */
	return(ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL));
#else
	return(ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL));
#endif
}

int in6_gif_input(struct mbuf **mp, int *offp, int proto)
{
	struct mbuf *m = *mp;
	struct ifnet *gifp = NULL;
	struct ip6_hdr *ip6;
	int af = 0;
	u_int32_t otos;

	ip6 = mtod(m, struct ip6_hdr *);

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

	if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
		m_freem(m);
		ip6stat.ip6s_nogif++;
		return IPPROTO_DONE;
	}

	otos = ip6->ip6_flow;
	m_adj(m, *offp);

	switch (proto) {
#if INET
	case IPPROTO_IPV4:
	    {
		struct ip *ip;
		u_int8_t otos8;
		af = AF_INET;
		otos8 = (ntohl(otos) >> 20) & 0xff;
		if (mbuf_len(m) < sizeof(*ip)) {
			m = m_pullup(m, sizeof(*ip));
			if (!m)
				return IPPROTO_DONE;
		}
		ip = mtod(m, struct ip *);
		if (gifp->if_flags & IFF_LINK1)
			ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos);
		else
			ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos);
		break;
	    }
#endif /* INET */
#if INET6
	case IPPROTO_IPV6:
	    {
		af = AF_INET6;
		if (mbuf_len(m) < sizeof(*ip6)) {
			m = m_pullup(m, sizeof(*ip6));
			if (!m)
				return IPPROTO_DONE;
		}
		ip6 = mtod(m, struct ip6_hdr *);
		if (gifp->if_flags & IFF_LINK1)
			ip6_ecn_egress(ECN_ALLOWED, &otos, &ip6->ip6_flow);
		else
			ip6_ecn_egress(ECN_NOCARE, &otos, &ip6->ip6_flow);
		break;
	    }
#endif
	default:
		ip6stat.ip6s_nogif++;
		m_freem(m);
		return IPPROTO_DONE;
	}

	if (m->m_pkthdr.rcvif)  /* replace the rcvif by gifp for ifnet_input to route it correctly */
		m->m_pkthdr.rcvif = gifp;

	ifnet_input(gifp, m, NULL);
	return IPPROTO_DONE;
}

/*
 * validate outer address.
 */
static int
gif_validate6(
	const struct ip6_hdr *ip6,
	struct gif_softc *sc,
	struct ifnet *ifp)
{
	struct sockaddr_in6 *src, *dst;

	src = (struct sockaddr_in6 *)(void *)sc->gif_psrc;
	dst = (struct sockaddr_in6 *)(void *)sc->gif_pdst;

	/*
	 * Check for address match.  Note that the check is for an incoming
	 * packet.  We should compare the *source* address in our configuration
	 * and the *destination* address of the packet, and vice versa.
	 */
	if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) ||
	    !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
		return 0;

	/* martian filters on outer source - done in ip6_input */

	/* ingress filters on outer source */
	if ((ifnet_flags(sc->gif_if) & IFF_LINK2) == 0 && ifp) {
		struct sockaddr_in6 sin6;
		struct rtentry *rt;

		bzero(&sin6, sizeof(sin6));
		sin6.sin6_family = AF_INET6;
		sin6.sin6_len = sizeof(struct sockaddr_in6);
		sin6.sin6_addr = ip6->ip6_src;

		rt = rtalloc1((struct sockaddr *)&sin6, 0, 0);
		if (rt != NULL)
			RT_LOCK(rt);
		if (!rt || rt->rt_ifp != ifp) {
#if 0
			log(LOG_WARNING, "%s: packet from %s dropped "
			    "due to ingress filter\n", if_name(&sc->gif_if),
			    ip6_sprintf(&sin6.sin6_addr));
#endif
			if (rt != NULL) {
				RT_UNLOCK(rt);
				rtfree(rt);
			}
			return 0;
		}
		RT_UNLOCK(rt);
		rtfree(rt);
	}

	return 128 * 2;
}

/*
 * we know that we are in IFF_UP, outer address available, and outer family
 * matched the physical addr family.  see gif_encapcheck().
 * sanity check for arg should have been done in the caller.
 */
int
gif_encapcheck6(
	const struct mbuf *m,
	__unused int off,
	__unused int proto,
	void *arg)
{
	struct ip6_hdr ip6;
	struct gif_softc *sc;
	struct ifnet *ifp;

	/* sanity check done in caller */
	sc = (struct gif_softc *)arg;

	mbuf_copydata((struct mbuf *)(size_t)m, 0, sizeof(ip6), &ip6);
	ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;

	return gif_validate6(&ip6, sc, ifp);
}
Commit	Line	Data
b0d623f7	1	/*
316670eb	2	* Copyright (c) 2009-2012 Apple Inc. All rights reserved.
b0d623f7 A	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28
9bccf70c A	29	/* $FreeBSD: src/sys/netinet6/in6_gif.c,v 1.2.2.3 2001/07/03 11:01:52 ume Exp $ */
9bccf70c A	30	/* $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $ */
1c79356b A	31
	32	/*
	33	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
	34	* All rights reserved.
	35	*
	36	* Redistribution and use in source and binary forms, with or without
	37	* modification, are permitted provided that the following conditions
	38	* are met:
	39	* 1. Redistributions of source code must retain the above copyright
	40	* notice, this list of conditions and the following disclaimer.
	41	* 2. Redistributions in binary form must reproduce the above copyright
	42	* notice, this list of conditions and the following disclaimer in the
	43	* documentation and/or other materials provided with the distribution.
	44	* 3. Neither the name of the project nor the names of its contributors
	45	* may be used to endorse or promote products derived from this software
	46	* without specific prior written permission.
	47	*
	48	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	49	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	50	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	51	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	52	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	53	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	54	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	55	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	56	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	57	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	58	* SUCH DAMAGE.
	59	*/
	60
1c79356b A	61
	62	#include <sys/param.h>
	63	#include <sys/systm.h>
	64	#include <sys/socket.h>
	65	#include <sys/sockio.h>
	66	#include <sys/mbuf.h>
	67	#include <sys/errno.h>
9bccf70c A	68	#include <sys/queue.h>
	69	#include <sys/syslog.h>
	70
1c79356b A	71	#include <sys/malloc.h>
	72	#include <sys/protosw.h>
	73
	74	#include <net/if.h>
	75	#include <net/route.h>
	76
	77	#include <netinet/in.h>
	78	#include <netinet/in_systm.h>
	79	#if INET
	80	#include <netinet/ip.h>
	81	#endif
	82	#include <netinet/ip_encap.h>
	83	#if INET6
	84	#include <netinet/ip6.h>
	85	#include <netinet6/ip6_var.h>
	86	#include <netinet6/in6_gif.h>
	87	#include <netinet6/in6_var.h>
1c79356b A	88	#endif
1c79356b A	89	#include <netinet/ip_ecn.h>
9bccf70c A	90	#if INET6
	91	#include <netinet6/ip6_ecn.h>
	92	#endif
1c79356b A	93
	94	#include <net/if_gif.h>
	95
	96	#include <net/net_osdep.h>
	97
2d21ac55 A	98	static __inline__ void*
	99	_cast_non_const(const void * ptr) {
	100	union {
	101	const void* cval;
	102	void* val;
	103	} ret;
	104
	105	ret.cval = ptr;
	106	return (ret.val);
	107	}
	108
1c79356b	109	int
91447636 A	110	in6_gif_output(
	111	struct ifnet *ifp,
	112	int family, /* family of the packet to be encapsulate. */
	113	struct mbuf *m,
2d21ac55	114	__unused struct rtentry *rt)
1c79356b	115	{
2d21ac55	116	struct gif_softc *sc = ifnet_softc(ifp);
1c79356b	117	struct sockaddr_in6 dst = (struct sockaddr_in6 )&sc->gif_ro6.ro_dst;
316670eb A	118	struct sockaddr_in6 sin6_src = (struct sockaddr_in6 )(void *)sc->gif_psrc;
316670eb A	119	struct sockaddr_in6 sin6_dst = (struct sockaddr_in6 )(void *)sc->gif_pdst;
1c79356b A	120	struct ip6_hdr *ip6;
	121	int proto;
	122	u_int8_t itos, otos;
	123
	124	if (sin6_src == NULL \|\| sin6_dst == NULL \|\|
	125	sin6_src->sin6_family != AF_INET6 \|\|
	126	sin6_dst->sin6_family != AF_INET6) {
	127	m_freem(m);
	128	return EAFNOSUPPORT;
	129	}
	130
	131	switch (family) {
	132	#if INET
	133	case AF_INET:
	134	{
	135	struct ip *ip;
	136
	137	proto = IPPROTO_IPV4;
2d21ac55	138	if (mbuf_len(m) < sizeof(*ip)) {
1c79356b A	139	m = m_pullup(m, sizeof(*ip));
	140	if (!m)
	141	return ENOBUFS;
	142	}
	143	ip = mtod(m, struct ip *);
	144	itos = ip->ip_tos;
	145	break;
	146	}
	147	#endif
	148	#if INET6
	149	case AF_INET6:
	150	{
1c79356b	151	proto = IPPROTO_IPV6;
2d21ac55	152	if (mbuf_len(m) < sizeof(*ip6)) {
1c79356b A	153	m = m_pullup(m, sizeof(*ip6));
	154	if (!m)
	155	return ENOBUFS;
	156	}
	157	ip6 = mtod(m, struct ip6_hdr *);
	158	itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
	159	break;
	160	}
	161	#endif
	162	default:
	163	#if DEBUG
	164	printf("in6_gif_output: warning: unknown family %d passed\n",
	165	family);
	166	#endif
	167	m_freem(m);
	168	return EAFNOSUPPORT;
	169	}
	170
	171	/* prepend new IP header */
	172	M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
2d21ac55	173	if (m && mbuf_len(m) < sizeof(struct ip6_hdr))
1c79356b A	174	m = m_pullup(m, sizeof(struct ip6_hdr));
	175	if (m == NULL) {
	176	printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
	177	return ENOBUFS;
	178	}
	179
	180	ip6 = mtod(m, struct ip6_hdr *);
	181	ip6->ip6_flow = 0;
	182	ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
	183	ip6->ip6_vfc \|= IPV6_VERSION;
	184	ip6->ip6_plen = htons((u_short)m->m_pkthdr.len);
	185	ip6->ip6_nxt = proto;
	186	ip6->ip6_hlim = ip6_gif_hlim;
	187	ip6->ip6_src = sin6_src->sin6_addr;
9bccf70c A	188	/* bidirectional configured tunnel mode */
	189	if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
	190	ip6->ip6_dst = sin6_dst->sin6_addr;
	191	else {
	192	m_freem(m);
	193	return ENETUNREACH;
1c79356b	194	}
6d2010ae A	195	ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE,
	196	&otos, &itos);
	197	ip6->ip6_flow &= ~htonl(0xff << 20);
9bccf70c	198	ip6->ip6_flow \|= htonl((u_int32_t)otos << 20);
1c79356b A	199
1c79356b A	200	if (dst->sin6_family != sin6_dst->sin6_family \|\|
935ed37a A	201	!IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr) \|\|
	202	(sc->gif_ro6.ro_rt != NULL &&
	203	(sc->gif_ro6.ro_rt->generation_id != route_generation \|\|
	204	sc->gif_ro6.ro_rt->rt_ifp == ifp))) {
b0d623f7	205	/* cache route doesn't match or recursive route */
1c79356b A	206	bzero(dst, sizeof(*dst));
	207	dst->sin6_family = sin6_dst->sin6_family;
	208	dst->sin6_len = sizeof(struct sockaddr_in6);
	209	dst->sin6_addr = sin6_dst->sin6_addr;
	210	if (sc->gif_ro6.ro_rt) {
9bccf70c	211	rtfree(sc->gif_ro6.ro_rt);
1c79356b A	212	sc->gif_ro6.ro_rt = NULL;
	213	}
	214	#if 0
	215	sc->gif_if.if_mtu = GIF_MTU;
	216	#endif
	217	}
	218
	219	if (sc->gif_ro6.ro_rt == NULL) {
	220	rtalloc((struct route *)&sc->gif_ro6);
	221	if (sc->gif_ro6.ro_rt == NULL) {
	222	m_freem(m);
	223	return ENETUNREACH;
	224	}
b0d623f7	225	RT_LOCK(sc->gif_ro6.ro_rt);
9bccf70c	226	/* if it constitutes infinite encapsulation, punt. */
935ed37a	227	if (sc->gif_ro6.ro_rt->rt_ifp == ifp) {
b0d623f7	228	RT_UNLOCK(sc->gif_ro6.ro_rt);
9bccf70c A	229	m_freem(m);
	230	return ENETUNREACH; /XXX/
	231	}
1c79356b A	232	#if 0
	233	ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
	234	- sizeof(struct ip6_hdr);
	235	#endif
b0d623f7	236	RT_UNLOCK(sc->gif_ro6.ro_rt);
1c79356b A	237	}
1c79356b A	238
9bccf70c A	239	#if IPV6_MINMTU
	240	/*
	241	* force fragmentation to minimum MTU, to avoid path MTU discovery.
	242	* it is too painful to ask for resend of inner packet, to achieve
	243	* path MTU discovery for encapsulated packets.
	244	*/
6d2010ae	245	return(ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL));
9bccf70c	246	#else
6d2010ae	247	return(ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL));
9bccf70c	248	#endif
1c79356b A	249	}
1c79356b A	250
6d2010ae	251	int in6_gif_input(struct mbuf *mp, int offp, int proto)
1c79356b A	252	{
1c79356b A	253	struct mbuf m = mp;
1c79356b A	254	struct ifnet *gifp = NULL;
1c79356b A	255	struct ip6_hdr *ip6;
1c79356b A	256	int af = 0;
	257	u_int32_t otos;
	258
	259	ip6 = mtod(m, struct ip6_hdr *);
	260
2d21ac55	261	gifp = ((struct gif_softc*)encap_getarg(m))->gif_if;
1c79356b	262
9bccf70c	263	if (gifp == NULL \|\| (gifp->if_flags & IFF_UP) == 0) {
1c79356b A	264	m_freem(m);
	265	ip6stat.ip6s_nogif++;
	266	return IPPROTO_DONE;
	267	}
	268
	269	otos = ip6->ip6_flow;
	270	m_adj(m, *offp);
	271
	272	switch (proto) {
	273	#if INET
	274	case IPPROTO_IPV4:
	275	{
	276	struct ip *ip;
	277	u_int8_t otos8;
	278	af = AF_INET;
	279	otos8 = (ntohl(otos) >> 20) & 0xff;
2d21ac55	280	if (mbuf_len(m) < sizeof(*ip)) {
1c79356b A	281	m = m_pullup(m, sizeof(*ip));
	282	if (!m)
	283	return IPPROTO_DONE;
	284	}
	285	ip = mtod(m, struct ip *);
	286	if (gifp->if_flags & IFF_LINK1)
	287	ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos);
9bccf70c A	288	else
9bccf70c A	289	ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos);
1c79356b A	290	break;
	291	}
	292	#endif /* INET */
	293	#if INET6
	294	case IPPROTO_IPV6:
	295	{
1c79356b	296	af = AF_INET6;
2d21ac55	297	if (mbuf_len(m) < sizeof(*ip6)) {
1c79356b A	298	m = m_pullup(m, sizeof(*ip6));
	299	if (!m)
	300	return IPPROTO_DONE;
	301	}
	302	ip6 = mtod(m, struct ip6_hdr *);
	303	if (gifp->if_flags & IFF_LINK1)
	304	ip6_ecn_egress(ECN_ALLOWED, &otos, &ip6->ip6_flow);
9bccf70c A	305	else
9bccf70c A	306	ip6_ecn_egress(ECN_NOCARE, &otos, &ip6->ip6_flow);
1c79356b A	307	break;
	308	}
	309	#endif
	310	default:
	311	ip6stat.ip6s_nogif++;
	312	m_freem(m);
	313	return IPPROTO_DONE;
	314	}
2d21ac55 A	315
	316	if (m->m_pkthdr.rcvif) /* replace the rcvif by gifp for ifnet_input to route it correctly */
	317	m->m_pkthdr.rcvif = gifp;
	318
	319	ifnet_input(gifp, m, NULL);
1c79356b A	320	return IPPROTO_DONE;
	321	}
	322
9bccf70c	323	/*
55e303ae	324	* validate outer address.
9bccf70c	325	*/
55e303ae	326	static int
2d21ac55 A	327	gif_validate6(
	328	const struct ip6_hdr *ip6,
	329	struct gif_softc *sc,
	330	struct ifnet *ifp)
55e303ae	331	{
9bccf70c	332	struct sockaddr_in6 src, dst;
9bccf70c	333
316670eb A	334	src = (struct sockaddr_in6 )(void )sc->gif_psrc;
316670eb A	335	dst = (struct sockaddr_in6 )(void )sc->gif_pdst;
9bccf70c	336
55e303ae A	337	/*
	338	* Check for address match. Note that the check is for an incoming
	339	* packet. We should compare the source address in our configuration
	340	* and the destination address of the packet, and vice versa.
	341	*/
	342	if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) \|\|
	343	!IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
9bccf70c A	344	return 0;
	345
	346	/* martian filters on outer source - done in ip6_input */
	347
	348	/* ingress filters on outer source */
2d21ac55	349	if ((ifnet_flags(sc->gif_if) & IFF_LINK2) == 0 && ifp) {
9bccf70c A	350	struct sockaddr_in6 sin6;
	351	struct rtentry *rt;
	352
	353	bzero(&sin6, sizeof(sin6));
	354	sin6.sin6_family = AF_INET6;
	355	sin6.sin6_len = sizeof(struct sockaddr_in6);
55e303ae	356	sin6.sin6_addr = ip6->ip6_src;
55e303ae	357
b0d623f7 A	358	rt = rtalloc1((struct sockaddr *)&sin6, 0, 0);
	359	if (rt != NULL)
	360	RT_LOCK(rt);
55e303ae	361	if (!rt \|\| rt->rt_ifp != ifp) {
9bccf70c A	362	#if 0
	363	log(LOG_WARNING, "%s: packet from %s dropped "
	364	"due to ingress filter\n", if_name(&sc->gif_if),
	365	ip6_sprintf(&sin6.sin6_addr));
1c79356b	366	#endif
b0d623f7 A	367	if (rt != NULL) {
b0d623f7 A	368	RT_UNLOCK(rt);
9bccf70c	369	rtfree(rt);
b0d623f7	370	}
9bccf70c	371	return 0;
1c79356b	372	}
b0d623f7	373	RT_UNLOCK(rt);
9bccf70c	374	rtfree(rt);
1c79356b A	375	}
1c79356b A	376
9bccf70c	377	return 128 * 2;
1c79356b	378	}
55e303ae A	379
	380	/*
	381	* we know that we are in IFF_UP, outer address available, and outer family
	382	* matched the physical addr family. see gif_encapcheck().
	383	* sanity check for arg should have been done in the caller.
	384	*/
	385	int
2d21ac55 A	386	gif_encapcheck6(
	387	const struct mbuf *m,
	388	__unused int off,
	389	__unused int proto,
	390	void *arg)
55e303ae A	391	{
	392	struct ip6_hdr ip6;
	393	struct gif_softc *sc;
	394	struct ifnet *ifp;
	395
	396	/* sanity check done in caller */
	397	sc = (struct gif_softc *)arg;
	398
b0d623f7	399	mbuf_copydata((struct mbuf *)(size_t)m, 0, sizeof(ip6), &ip6);
55e303ae A	400	ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
	401
	402	return gif_validate6(&ip6, sc, ifp);
	403	}