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

/*
 * Copyright (c) 2009-2016 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@
 */

/* $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>

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;

	GIF_LOCK_ASSERT(sc);

	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, 1);
	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_NORMAL : ECN_NOCARE,
	    &otos, &itos);
	ip6->ip6_flow &= ~htonl(0xff << 20);
	ip6->ip6_flow |= htonl((u_int32_t)otos << 20);

	if (ROUTE_UNUSABLE(&sc->gif_ro6) ||
	    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->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;
		ROUTE_RELEASE(&sc->gif_ro6);
#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;
	int egress_success = 0;

	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, old_tos;
		int sum;

		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) {
			old_tos = ip->ip_tos;
			egress_success = ip_ecn_egress(ECN_NORMAL, &otos8, &ip->ip_tos);
			if (old_tos != ip->ip_tos) {
			    sum = ~ntohs(ip->ip_sum) & 0xffff;
			    sum += (~old_tos & 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, &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)
			egress_success = ip6_ecn_egress(ECN_NORMAL, &otos, &ip6->ip6_flow);
		else
			egress_success = ip6_ecn_egress(ECN_NOCARE, &otos, &ip6->ip6_flow);
		break;
	    }
#endif
	default:
		ip6stat.ip6s_nogif++;
		m_freem(m);
		return (IPPROTO_DONE);
	}

	if (egress_success == 0) {
		ip6stat.ip6s_nogif++;
		m_freem(m);
		return (IPPROTO_DONE);
	}

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

	GIF_LOCK_ASSERT(sc);

	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	/*
39037602	2	* Copyright (c) 2009-2016 Apple Inc. All rights reserved.
b0d623f7 A	3	*
b0d623f7 A	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
39236c6e	5	*
b0d623f7 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	*
b0d623f7 A	15	* Please obtain a copy of the License at
b0d623f7 A	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
39236c6e	17	*
b0d623f7 A	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.
39236c6e	25	*
b0d623f7 A	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28
39236c6e A	29	/* $FreeBSD: src/sys/netinet6/in6_gif.c,v 1.2.2.3 2001/07/03 11:01:52 ume Exp $ */
39236c6e 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
1c79356b	98	int
91447636 A	99	in6_gif_output(
	100	struct ifnet *ifp,
	101	int family, /* family of the packet to be encapsulate. */
	102	struct mbuf *m,
2d21ac55	103	__unused struct rtentry *rt)
1c79356b	104	{
2d21ac55	105	struct gif_softc *sc = ifnet_softc(ifp);
1c79356b	106	struct sockaddr_in6 dst = (struct sockaddr_in6 )&sc->gif_ro6.ro_dst;
39236c6e A	107	struct sockaddr_in6 sin6_src = (struct sockaddr_in6 )
	108	(void *)sc->gif_psrc;
	109	struct sockaddr_in6 sin6_dst = (struct sockaddr_in6 )
	110	(void *)sc->gif_pdst;
1c79356b A	111	struct ip6_hdr *ip6;
	112	int proto;
	113	u_int8_t itos, otos;
	114
39236c6e A	115	GIF_LOCK_ASSERT(sc);
39236c6e A	116
1c79356b A	117	if (sin6_src == NULL \|\| sin6_dst == NULL \|\|
	118	sin6_src->sin6_family != AF_INET6 \|\|
	119	sin6_dst->sin6_family != AF_INET6) {
	120	m_freem(m);
39236c6e	121	return (EAFNOSUPPORT);
1c79356b A	122	}
	123
	124	switch (family) {
	125	#if INET
	126	case AF_INET:
	127	{
	128	struct ip *ip;
	129
	130	proto = IPPROTO_IPV4;
39236c6e A	131	if (mbuf_len(m) < sizeof (*ip)) {
39236c6e A	132	m = m_pullup(m, sizeof (*ip));
1c79356b	133	if (!m)
39236c6e	134	return (ENOBUFS);
1c79356b A	135	}
	136	ip = mtod(m, struct ip *);
	137	itos = ip->ip_tos;
	138	break;
	139	}
	140	#endif
	141	#if INET6
	142	case AF_INET6:
	143	{
1c79356b	144	proto = IPPROTO_IPV6;
39236c6e A	145	if (mbuf_len(m) < sizeof (*ip6)) {
39236c6e A	146	m = m_pullup(m, sizeof (*ip6));
1c79356b	147	if (!m)
39236c6e	148	return (ENOBUFS);
1c79356b A	149	}
	150	ip6 = mtod(m, struct ip6_hdr *);
	151	itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
	152	break;
	153	}
	154	#endif
	155	default:
	156	#if DEBUG
	157	printf("in6_gif_output: warning: unknown family %d passed\n",
	158	family);
	159	#endif
	160	m_freem(m);
39236c6e	161	return (EAFNOSUPPORT);
1c79356b	162	}
39236c6e	163
1c79356b	164	/* prepend new IP header */
3e170ce0	165	M_PREPEND(m, sizeof (struct ip6_hdr), M_DONTWAIT, 1);
39236c6e A	166	if (m && mbuf_len(m) < sizeof (struct ip6_hdr))
39236c6e A	167	m = m_pullup(m, sizeof (struct ip6_hdr));
1c79356b A	168	if (m == NULL) {
1c79356b A	169	printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
39236c6e	170	return (ENOBUFS);
1c79356b A	171	}
	172
	173	ip6 = mtod(m, struct ip6_hdr *);
	174	ip6->ip6_flow = 0;
	175	ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
	176	ip6->ip6_vfc \|= IPV6_VERSION;
	177	ip6->ip6_plen = htons((u_short)m->m_pkthdr.len);
	178	ip6->ip6_nxt = proto;
	179	ip6->ip6_hlim = ip6_gif_hlim;
	180	ip6->ip6_src = sin6_src->sin6_addr;
9bccf70c A	181	/* bidirectional configured tunnel mode */
	182	if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
	183	ip6->ip6_dst = sin6_dst->sin6_addr;
	184	else {
	185	m_freem(m);
39236c6e	186	return (ENETUNREACH);
1c79356b	187	}
3e170ce0	188	ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_NORMAL : ECN_NOCARE,
39236c6e	189	&otos, &itos);
6d2010ae	190	ip6->ip6_flow &= ~htonl(0xff << 20);
9bccf70c	191	ip6->ip6_flow \|= htonl((u_int32_t)otos << 20);
1c79356b	192
39236c6e A	193	if (ROUTE_UNUSABLE(&sc->gif_ro6) \|\|
39236c6e A	194	dst->sin6_family != sin6_dst->sin6_family \|\|
935ed37a	195	!IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr) \|\|
39236c6e	196	(sc->gif_ro6.ro_rt != NULL && sc->gif_ro6.ro_rt->rt_ifp == ifp)) {
b0d623f7	197	/* cache route doesn't match or recursive route */
39236c6e	198	bzero(dst, sizeof (*dst));
1c79356b	199	dst->sin6_family = sin6_dst->sin6_family;
39236c6e	200	dst->sin6_len = sizeof (struct sockaddr_in6);
1c79356b	201	dst->sin6_addr = sin6_dst->sin6_addr;
39236c6e	202	ROUTE_RELEASE(&sc->gif_ro6);
1c79356b A	203	#if 0
	204	sc->gif_if.if_mtu = GIF_MTU;
	205	#endif
	206	}
	207
	208	if (sc->gif_ro6.ro_rt == NULL) {
	209	rtalloc((struct route *)&sc->gif_ro6);
	210	if (sc->gif_ro6.ro_rt == NULL) {
	211	m_freem(m);
39236c6e	212	return (ENETUNREACH);
1c79356b	213	}
b0d623f7	214	RT_LOCK(sc->gif_ro6.ro_rt);
9bccf70c	215	/* if it constitutes infinite encapsulation, punt. */
935ed37a	216	if (sc->gif_ro6.ro_rt->rt_ifp == ifp) {
b0d623f7	217	RT_UNLOCK(sc->gif_ro6.ro_rt);
9bccf70c	218	m_freem(m);
39236c6e	219	return (ENETUNREACH); /* XXX */
9bccf70c	220	}
1c79356b A	221	#if 0
1c79356b A	222	ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
39236c6e	223	- sizeof (struct ip6_hdr);
1c79356b	224	#endif
b0d623f7	225	RT_UNLOCK(sc->gif_ro6.ro_rt);
1c79356b	226	}
39236c6e	227
9bccf70c A	228	#if IPV6_MINMTU
	229	/*
	230	* force fragmentation to minimum MTU, to avoid path MTU discovery.
	231	* it is too painful to ask for resend of inner packet, to achieve
	232	* path MTU discovery for encapsulated packets.
	233	*/
39236c6e	234	return (ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL));
9bccf70c	235	#else
39236c6e	236	return (ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, NULL));
9bccf70c	237	#endif
1c79356b A	238	}
1c79356b A	239
39236c6e A	240	int
39236c6e A	241	in6_gif_input(struct mbuf *mp, int offp, int proto)
1c79356b A	242	{
1c79356b A	243	struct mbuf m = mp;
1c79356b A	244	struct ifnet *gifp = NULL;
1c79356b A	245	struct ip6_hdr *ip6;
1c79356b A	246	int af = 0;
1c79356b A	247	u_int32_t otos;
3e170ce0	248	int egress_success = 0;
1c79356b A	249
	250	ip6 = mtod(m, struct ip6_hdr *);
	251
39236c6e	252	gifp = ((struct gif_softc *)encap_getarg(m))->gif_if;
1c79356b	253
9bccf70c	254	if (gifp == NULL \|\| (gifp->if_flags & IFF_UP) == 0) {
1c79356b A	255	m_freem(m);
1c79356b A	256	ip6stat.ip6s_nogif++;
39236c6e	257	return (IPPROTO_DONE);
1c79356b A	258	}
	259
	260	otos = ip6->ip6_flow;
	261	m_adj(m, *offp);
	262
	263	switch (proto) {
	264	#if INET
	265	case IPPROTO_IPV4:
	266	{
	267	struct ip *ip;
4bd07ac2 A	268	u_int8_t otos8, old_tos;
	269	int sum;
	270
1c79356b A	271	af = AF_INET;
1c79356b A	272	otos8 = (ntohl(otos) >> 20) & 0xff;
39236c6e A	273	if (mbuf_len(m) < sizeof (*ip)) {
39236c6e A	274	m = m_pullup(m, sizeof (*ip));
1c79356b	275	if (!m)
39236c6e	276	return (IPPROTO_DONE);
1c79356b A	277	}
1c79356b A	278	ip = mtod(m, struct ip *);
4bd07ac2 A	279	if (gifp->if_flags & IFF_LINK1) {
4bd07ac2 A	280	old_tos = ip->ip_tos;
3e170ce0	281	egress_success = ip_ecn_egress(ECN_NORMAL, &otos8, &ip->ip_tos);
4bd07ac2 A	282	if (old_tos != ip->ip_tos) {
	283	sum = ~ntohs(ip->ip_sum) & 0xffff;
	284	sum += (~old_tos & 0xffff) + ip->ip_tos;
	285	sum = (sum >> 16) + (sum & 0xffff);
	286	sum += (sum >> 16); /* add carry */
	287	ip->ip_sum = htons(~sum & 0xffff);
	288	}
	289	} else
3e170ce0	290	egress_success = ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos);
1c79356b A	291	break;
	292	}
	293	#endif /* INET */
	294	#if INET6
	295	case IPPROTO_IPV6:
	296	{
1c79356b	297	af = AF_INET6;
39236c6e A	298	if (mbuf_len(m) < sizeof (*ip6)) {
39236c6e A	299	m = m_pullup(m, sizeof (*ip6));
1c79356b	300	if (!m)
39236c6e	301	return (IPPROTO_DONE);
1c79356b A	302	}
	303	ip6 = mtod(m, struct ip6_hdr *);
	304	if (gifp->if_flags & IFF_LINK1)
3e170ce0	305	egress_success = ip6_ecn_egress(ECN_NORMAL, &otos, &ip6->ip6_flow);
9bccf70c	306	else
3e170ce0	307	egress_success = ip6_ecn_egress(ECN_NOCARE, &otos, &ip6->ip6_flow);
1c79356b A	308	break;
	309	}
	310	#endif
	311	default:
	312	ip6stat.ip6s_nogif++;
	313	m_freem(m);
39236c6e	314	return (IPPROTO_DONE);
1c79356b	315	}
2d21ac55	316
3e170ce0 A	317	if (egress_success == 0) {
	318	ip6stat.ip6s_nogif++;
	319	m_freem(m);
	320	return (IPPROTO_DONE);
	321	}
	322
39236c6e A	323	/* Replace the rcvif by gifp for ifnet_input to route it correctly */
39236c6e A	324	if (m->m_pkthdr.rcvif)
2d21ac55 A	325	m->m_pkthdr.rcvif = gifp;
	326
	327	ifnet_input(gifp, m, NULL);
39236c6e	328	return (IPPROTO_DONE);
1c79356b A	329	}
1c79356b A	330
9bccf70c	331	/*
55e303ae	332	* validate outer address.
9bccf70c	333	*/
55e303ae	334	static int
2d21ac55 A	335	gif_validate6(
	336	const struct ip6_hdr *ip6,
	337	struct gif_softc *sc,
	338	struct ifnet *ifp)
55e303ae	339	{
9bccf70c	340	struct sockaddr_in6 src, dst;
9bccf70c	341
316670eb A	342	src = (struct sockaddr_in6 )(void )sc->gif_psrc;
316670eb A	343	dst = (struct sockaddr_in6 )(void )sc->gif_pdst;
9bccf70c	344
55e303ae A	345	/*
	346	* Check for address match. Note that the check is for an incoming
	347	* packet. We should compare the source address in our configuration
	348	* and the destination address of the packet, and vice versa.
	349	*/
	350	if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) \|\|
	351	!IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
39236c6e	352	return (0);
9bccf70c A	353
	354	/* martian filters on outer source - done in ip6_input */
	355
	356	/* ingress filters on outer source */
2d21ac55	357	if ((ifnet_flags(sc->gif_if) & IFF_LINK2) == 0 && ifp) {
9bccf70c A	358	struct sockaddr_in6 sin6;
	359	struct rtentry *rt;
	360
39236c6e	361	bzero(&sin6, sizeof (sin6));
9bccf70c	362	sin6.sin6_family = AF_INET6;
39236c6e	363	sin6.sin6_len = sizeof (struct sockaddr_in6);
55e303ae	364	sin6.sin6_addr = ip6->ip6_src;
55e303ae	365
b0d623f7 A	366	rt = rtalloc1((struct sockaddr *)&sin6, 0, 0);
	367	if (rt != NULL)
	368	RT_LOCK(rt);
55e303ae	369	if (!rt \|\| rt->rt_ifp != ifp) {
9bccf70c A	370	#if 0
	371	log(LOG_WARNING, "%s: packet from %s dropped "
	372	"due to ingress filter\n", if_name(&sc->gif_if),
	373	ip6_sprintf(&sin6.sin6_addr));
1c79356b	374	#endif
b0d623f7 A	375	if (rt != NULL) {
b0d623f7 A	376	RT_UNLOCK(rt);
9bccf70c	377	rtfree(rt);
b0d623f7	378	}
39236c6e	379	return (0);
1c79356b	380	}
b0d623f7	381	RT_UNLOCK(rt);
9bccf70c	382	rtfree(rt);
1c79356b A	383	}
1c79356b A	384
39236c6e	385	return (128 * 2);
1c79356b	386	}
55e303ae A	387
	388	/*
	389	* we know that we are in IFF_UP, outer address available, and outer family
	390	* matched the physical addr family. see gif_encapcheck().
	391	* sanity check for arg should have been done in the caller.
	392	*/
	393	int
2d21ac55 A	394	gif_encapcheck6(
	395	const struct mbuf *m,
	396	__unused int off,
	397	__unused int proto,
	398	void *arg)
55e303ae A	399	{
	400	struct ip6_hdr ip6;
	401	struct gif_softc *sc;
	402	struct ifnet *ifp;
	403
	404	/* sanity check done in caller */
	405	sc = (struct gif_softc *)arg;
	406
39236c6e A	407	GIF_LOCK_ASSERT(sc);
	408
	409	mbuf_copydata((struct mbuf *)(size_t)m, 0, sizeof (ip6), &ip6);
55e303ae A	410	ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
55e303ae A	411
39236c6e	412	return (gif_validate6(&ip6, sc, ifp));
55e303ae	413	}