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

/*	$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 *)sc->gif_psrc;
	struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)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;
	}
	if (ifp->if_flags & IFF_LINK1)
		ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
	else
		ip_ecn_ingress(ECN_NOCARE, &otos, &itos);
	ip6->ip6_flow &= ~ntohl(0xff00000);
	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)) {
		/* cache route doesn't match */
		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;
		}

		/* 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_ro6.ro_rt->rt_ifp->if_mtu
			- sizeof(struct ip6_hdr);
#endif
	}
	
#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, 0));
#else
	return(ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, 0));
#endif
}

int in6_gif_input(mp, offp)
	struct mbuf **mp;
	int *offp;
{
	struct mbuf *m = *mp;
	struct ifnet *gifp = NULL;
	struct ip6_hdr *ip6;
	int af = 0;
	u_int32_t otos;
	u_int8_t proto;

	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;
	}

	proto = ip6->ip6_nxt;
	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 *)sc->gif_psrc;
	dst = (struct sockaddr_in6 *)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;
#ifndef SCOPEDROUTING
		sin6.sin6_scope_id = 0; /* XXX */
#endif

		rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
		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)
				rtfree(rt);
			return 0;
		}
		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(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
9bccf70c A	1	/* $FreeBSD: src/sys/netinet6/in6_gif.c,v 1.2.2.3 2001/07/03 11:01:52 ume Exp $ */
9bccf70c A	2	/* $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $ */
1c79356b A	3
	4	/*
	5	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
	6	* All rights reserved.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. Neither the name of the project nor the names of its contributors
	17	* may be used to endorse or promote products derived from this software
	18	* without specific prior written permission.
	19	*
	20	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	21	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	22	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	23	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	24	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	25	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	26	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	27	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	28	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	29	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	30	* SUCH DAMAGE.
	31	*/
	32
1c79356b A	33
	34	#include <sys/param.h>
	35	#include <sys/systm.h>
	36	#include <sys/socket.h>
	37	#include <sys/sockio.h>
	38	#include <sys/mbuf.h>
	39	#include <sys/errno.h>
9bccf70c A	40	#include <sys/queue.h>
	41	#include <sys/syslog.h>
	42
1c79356b A	43	#include <sys/malloc.h>
	44	#include <sys/protosw.h>
	45
	46	#include <net/if.h>
	47	#include <net/route.h>
	48
	49	#include <netinet/in.h>
	50	#include <netinet/in_systm.h>
	51	#if INET
	52	#include <netinet/ip.h>
	53	#endif
	54	#include <netinet/ip_encap.h>
	55	#if INET6
	56	#include <netinet/ip6.h>
	57	#include <netinet6/ip6_var.h>
	58	#include <netinet6/in6_gif.h>
	59	#include <netinet6/in6_var.h>
1c79356b A	60	#endif
1c79356b A	61	#include <netinet/ip_ecn.h>
9bccf70c A	62	#if INET6
	63	#include <netinet6/ip6_ecn.h>
	64	#endif
1c79356b A	65
	66	#include <net/if_gif.h>
	67
	68	#include <net/net_osdep.h>
	69
2d21ac55 A	70	static __inline__ void*
	71	_cast_non_const(const void * ptr) {
	72	union {
	73	const void* cval;
	74	void* val;
	75	} ret;
	76
	77	ret.cval = ptr;
	78	return (ret.val);
	79	}
	80
1c79356b	81	int
91447636 A	82	in6_gif_output(
	83	struct ifnet *ifp,
	84	int family, /* family of the packet to be encapsulate. */
	85	struct mbuf *m,
2d21ac55	86	__unused struct rtentry *rt)
1c79356b	87	{
2d21ac55	88	struct gif_softc *sc = ifnet_softc(ifp);
1c79356b A	89	struct sockaddr_in6 dst = (struct sockaddr_in6 )&sc->gif_ro6.ro_dst;
	90	struct sockaddr_in6 sin6_src = (struct sockaddr_in6 )sc->gif_psrc;
	91	struct sockaddr_in6 sin6_dst = (struct sockaddr_in6 )sc->gif_pdst;
	92	struct ip6_hdr *ip6;
	93	int proto;
	94	u_int8_t itos, otos;
	95
	96	if (sin6_src == NULL \|\| sin6_dst == NULL \|\|
	97	sin6_src->sin6_family != AF_INET6 \|\|
	98	sin6_dst->sin6_family != AF_INET6) {
	99	m_freem(m);
	100	return EAFNOSUPPORT;
	101	}
	102
	103	switch (family) {
	104	#if INET
	105	case AF_INET:
	106	{
	107	struct ip *ip;
	108
	109	proto = IPPROTO_IPV4;
2d21ac55	110	if (mbuf_len(m) < sizeof(*ip)) {
1c79356b A	111	m = m_pullup(m, sizeof(*ip));
	112	if (!m)
	113	return ENOBUFS;
	114	}
	115	ip = mtod(m, struct ip *);
	116	itos = ip->ip_tos;
	117	break;
	118	}
	119	#endif
	120	#if INET6
	121	case AF_INET6:
	122	{
1c79356b	123	proto = IPPROTO_IPV6;
2d21ac55	124	if (mbuf_len(m) < sizeof(*ip6)) {
1c79356b A	125	m = m_pullup(m, sizeof(*ip6));
	126	if (!m)
	127	return ENOBUFS;
	128	}
	129	ip6 = mtod(m, struct ip6_hdr *);
	130	itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
	131	break;
	132	}
	133	#endif
	134	default:
	135	#if DEBUG
	136	printf("in6_gif_output: warning: unknown family %d passed\n",
	137	family);
	138	#endif
	139	m_freem(m);
	140	return EAFNOSUPPORT;
	141	}
	142
	143	/* prepend new IP header */
	144	M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT);
2d21ac55	145	if (m && mbuf_len(m) < sizeof(struct ip6_hdr))
1c79356b A	146	m = m_pullup(m, sizeof(struct ip6_hdr));
	147	if (m == NULL) {
	148	printf("ENOBUFS in in6_gif_output %d\n", __LINE__);
	149	return ENOBUFS;
	150	}
	151
	152	ip6 = mtod(m, struct ip6_hdr *);
	153	ip6->ip6_flow = 0;
	154	ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
	155	ip6->ip6_vfc \|= IPV6_VERSION;
	156	ip6->ip6_plen = htons((u_short)m->m_pkthdr.len);
	157	ip6->ip6_nxt = proto;
	158	ip6->ip6_hlim = ip6_gif_hlim;
	159	ip6->ip6_src = sin6_src->sin6_addr;
9bccf70c A	160	/* bidirectional configured tunnel mode */
	161	if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr))
	162	ip6->ip6_dst = sin6_dst->sin6_addr;
	163	else {
	164	m_freem(m);
	165	return ENETUNREACH;
1c79356b	166	}
9bccf70c	167	if (ifp->if_flags & IFF_LINK1)
1c79356b	168	ip_ecn_ingress(ECN_ALLOWED, &otos, &itos);
9bccf70c A	169	else
	170	ip_ecn_ingress(ECN_NOCARE, &otos, &itos);
	171	ip6->ip6_flow &= ~ntohl(0xff00000);
	172	ip6->ip6_flow \|= htonl((u_int32_t)otos << 20);
1c79356b A	173
	174	if (dst->sin6_family != sin6_dst->sin6_family \|\|
	175	!IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
	176	/* cache route doesn't match */
	177	bzero(dst, sizeof(*dst));
	178	dst->sin6_family = sin6_dst->sin6_family;
	179	dst->sin6_len = sizeof(struct sockaddr_in6);
	180	dst->sin6_addr = sin6_dst->sin6_addr;
	181	if (sc->gif_ro6.ro_rt) {
9bccf70c	182	rtfree(sc->gif_ro6.ro_rt);
1c79356b A	183	sc->gif_ro6.ro_rt = NULL;
	184	}
	185	#if 0
	186	sc->gif_if.if_mtu = GIF_MTU;
	187	#endif
	188	}
	189
	190	if (sc->gif_ro6.ro_rt == NULL) {
	191	rtalloc((struct route *)&sc->gif_ro6);
	192	if (sc->gif_ro6.ro_rt == NULL) {
	193	m_freem(m);
	194	return ENETUNREACH;
	195	}
9bccf70c A	196
	197	/* if it constitutes infinite encapsulation, punt. */
	198	if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
	199	m_freem(m);
	200	return ENETUNREACH; /XXX/
	201	}
1c79356b A	202	#if 0
	203	ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu
	204	- sizeof(struct ip6_hdr);
	205	#endif
	206	}
	207
9bccf70c A	208	#if IPV6_MINMTU
	209	/*
	210	* force fragmentation to minimum MTU, to avoid path MTU discovery.
	211	* it is too painful to ask for resend of inner packet, to achieve
	212	* path MTU discovery for encapsulated packets.
	213	*/
91447636	214	return(ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, 0));
9bccf70c	215	#else
91447636	216	return(ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL, 0));
9bccf70c	217	#endif
1c79356b A	218	}
1c79356b A	219
9bccf70c	220	int in6_gif_input(mp, offp)
1c79356b	221	struct mbuf **mp;
9bccf70c	222	int *offp;
1c79356b A	223	{
1c79356b A	224	struct mbuf m = mp;
1c79356b A	225	struct ifnet *gifp = NULL;
1c79356b A	226	struct ip6_hdr *ip6;
1c79356b A	227	int af = 0;
1c79356b A	228	u_int32_t otos;
9bccf70c	229	u_int8_t proto;
1c79356b A	230
	231	ip6 = mtod(m, struct ip6_hdr *);
	232
2d21ac55	233	gifp = ((struct gif_softc*)encap_getarg(m))->gif_if;
1c79356b	234
9bccf70c	235	if (gifp == NULL \|\| (gifp->if_flags & IFF_UP) == 0) {
1c79356b A	236	m_freem(m);
	237	ip6stat.ip6s_nogif++;
	238	return IPPROTO_DONE;
	239	}
	240
9bccf70c	241	proto = ip6->ip6_nxt;
1c79356b A	242	otos = ip6->ip6_flow;
	243	m_adj(m, *offp);
	244
	245	switch (proto) {
	246	#if INET
	247	case IPPROTO_IPV4:
	248	{
	249	struct ip *ip;
	250	u_int8_t otos8;
	251	af = AF_INET;
	252	otos8 = (ntohl(otos) >> 20) & 0xff;
2d21ac55	253	if (mbuf_len(m) < sizeof(*ip)) {
1c79356b A	254	m = m_pullup(m, sizeof(*ip));
	255	if (!m)
	256	return IPPROTO_DONE;
	257	}
	258	ip = mtod(m, struct ip *);
	259	if (gifp->if_flags & IFF_LINK1)
	260	ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos);
9bccf70c A	261	else
9bccf70c A	262	ip_ecn_egress(ECN_NOCARE, &otos8, &ip->ip_tos);
1c79356b A	263	break;
	264	}
	265	#endif /* INET */
	266	#if INET6
	267	case IPPROTO_IPV6:
	268	{
1c79356b	269	af = AF_INET6;
2d21ac55	270	if (mbuf_len(m) < sizeof(*ip6)) {
1c79356b A	271	m = m_pullup(m, sizeof(*ip6));
	272	if (!m)
	273	return IPPROTO_DONE;
	274	}
	275	ip6 = mtod(m, struct ip6_hdr *);
	276	if (gifp->if_flags & IFF_LINK1)
	277	ip6_ecn_egress(ECN_ALLOWED, &otos, &ip6->ip6_flow);
9bccf70c A	278	else
9bccf70c A	279	ip6_ecn_egress(ECN_NOCARE, &otos, &ip6->ip6_flow);
1c79356b A	280	break;
	281	}
	282	#endif
	283	default:
	284	ip6stat.ip6s_nogif++;
	285	m_freem(m);
	286	return IPPROTO_DONE;
	287	}
2d21ac55 A	288
	289	if (m->m_pkthdr.rcvif) /* replace the rcvif by gifp for ifnet_input to route it correctly */
	290	m->m_pkthdr.rcvif = gifp;
	291
	292	ifnet_input(gifp, m, NULL);
1c79356b A	293	return IPPROTO_DONE;
	294	}
	295
9bccf70c	296	/*
55e303ae	297	* validate outer address.
9bccf70c	298	*/
55e303ae	299	static int
2d21ac55 A	300	gif_validate6(
	301	const struct ip6_hdr *ip6,
	302	struct gif_softc *sc,
	303	struct ifnet *ifp)
55e303ae	304	{
9bccf70c	305	struct sockaddr_in6 src, dst;
9bccf70c	306
9bccf70c A	307	src = (struct sockaddr_in6 *)sc->gif_psrc;
	308	dst = (struct sockaddr_in6 *)sc->gif_pdst;
	309
55e303ae A	310	/*
	311	* Check for address match. Note that the check is for an incoming
	312	* packet. We should compare the source address in our configuration
	313	* and the destination address of the packet, and vice versa.
	314	*/
	315	if (!IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6->ip6_dst) \|\|
	316	!IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_src))
9bccf70c A	317	return 0;
	318
	319	/* martian filters on outer source - done in ip6_input */
	320
	321	/* ingress filters on outer source */
2d21ac55	322	if ((ifnet_flags(sc->gif_if) & IFF_LINK2) == 0 && ifp) {
9bccf70c A	323	struct sockaddr_in6 sin6;
	324	struct rtentry *rt;
	325
	326	bzero(&sin6, sizeof(sin6));
	327	sin6.sin6_family = AF_INET6;
	328	sin6.sin6_len = sizeof(struct sockaddr_in6);
55e303ae A	329	sin6.sin6_addr = ip6->ip6_src;
	330	#ifndef SCOPEDROUTING
	331	sin6.sin6_scope_id = 0; /* XXX */
	332	#endif
	333
9bccf70c	334	rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
55e303ae	335	if (!rt \|\| rt->rt_ifp != ifp) {
9bccf70c A	336	#if 0
	337	log(LOG_WARNING, "%s: packet from %s dropped "
	338	"due to ingress filter\n", if_name(&sc->gif_if),
	339	ip6_sprintf(&sin6.sin6_addr));
1c79356b	340	#endif
9bccf70c A	341	if (rt)
	342	rtfree(rt);
	343	return 0;
1c79356b	344	}
9bccf70c	345	rtfree(rt);
1c79356b A	346	}
1c79356b A	347
9bccf70c	348	return 128 * 2;
1c79356b	349	}
55e303ae A	350
	351	/*
	352	* we know that we are in IFF_UP, outer address available, and outer family
	353	* matched the physical addr family. see gif_encapcheck().
	354	* sanity check for arg should have been done in the caller.
	355	*/
	356	int
2d21ac55 A	357	gif_encapcheck6(
	358	const struct mbuf *m,
	359	__unused int off,
	360	__unused int proto,
	361	void *arg)
55e303ae A	362	{
	363	struct ip6_hdr ip6;
	364	struct gif_softc *sc;
	365	struct ifnet *ifp;
	366
	367	/* sanity check done in caller */
	368	sc = (struct gif_softc *)arg;
	369
2d21ac55	370	mbuf_copydata(m, 0, sizeof(ip6), &ip6);
55e303ae A	371	ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
	372
	373	return gif_validate6(&ip6, sc, ifp);
	374	}