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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*	$KAME: in_gif.c,v 1.27 2000/03/30 01:29:05 jinmei 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.
 */

/*
 * in_gif.c
 */
#if BSD310
#include "opt_mrouting.h"
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
#include "opt_inet.h"
#endif
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/mbuf.h>
#include <sys/errno.h>
#ifdef __FreeBSD__
#include <sys/kernel.h>
#include <sys/sysctl.h>
#endif
#if !defined(__FreeBSD__) || __FreeBSD__ < 3
#include <sys/ioctl.h>
#endif
#include <sys/protosw.h>

#if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__)
#include <sys/malloc.h>
#endif

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

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/in_gif.h>
#include <netinet/in_var.h>
#include <netinet/ip_encap.h>
#include <netinet/ip_ecn.h>

#if INET6
#include <netinet/ip6.h>
#endif

#if MROUTING
#include <netinet/ip_mroute.h>
#endif /* MROUTING */

#include <net/if_gif.h>	

#include "gif.h"

#include <net/net_osdep.h>

#if NGIF > 0
int	ip_gif_ttl = GIF_TTL;
#else
int	ip_gif_ttl = 0;
#endif

extern struct protosw in_gif_protosw;

SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl,
	 CTLFLAG_RW, &ip_gif_ttl , 0, "");

int
in_gif_output(ifp, family, m, rt)
	struct ifnet	*ifp;
	int		family;
	struct mbuf	*m;
	struct rtentry *rt;
{
	register struct gif_softc *sc = (struct gif_softc*)ifp;
	struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
	struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
	struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
	struct ip iphdr;	/* capsule IP header, host byte ordered */
	int proto, error;
	u_int8_t tos;

	if (sin_src == NULL || sin_dst == NULL ||
	    sin_src->sin_family != AF_INET ||
	    sin_dst->sin_family != AF_INET) {
		printf("in_gif_output: unknown family src=%x dst=%x\n", sin_src->sin_family, sin_dst->sin_family);
		m_freem(m);
		return EAFNOSUPPORT;
	}

	switch (family) {
#if INET
	case AF_INET:
	    {
		struct ip *ip;

		proto = IPPROTO_IPV4;
		if (m->m_len < sizeof(*ip)) {
			m = m_pullup(m, sizeof(*ip));
			if (!m)
				return ENOBUFS;
		}
		ip = mtod(m, struct ip *);
		tos = ip->ip_tos;
		break;
	    }
#endif /*INET*/
#if INET6
	case AF_INET6:
	    {
		struct ip6_hdr *ip6;
		proto = IPPROTO_IPV6;
		if (m->m_len < sizeof(*ip6)) {
			m = m_pullup(m, sizeof(*ip6));
			if (!m)
				return ENOBUFS;
		}
		ip6 = mtod(m, struct ip6_hdr *);
		tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
		break;
	    }
#endif /*INET6*/
	default:
#if DEBUG
		printf("in_gif_output: warning: unknown family %d passed\n",
			family);
#endif
		m_freem(m);
		return EAFNOSUPPORT;
	}

	bzero(&iphdr, sizeof(iphdr));
	iphdr.ip_src = sin_src->sin_addr;
	if (ifp->if_flags & IFF_LINK0) {
		/* multi-destination mode */
		if (sin_dst->sin_addr.s_addr != INADDR_ANY)
			iphdr.ip_dst = sin_dst->sin_addr;
		else if (rt) {
			if (family != AF_INET) {
				m_freem(m);
				return EINVAL;	/*XXX*/
			}
			iphdr.ip_dst = ((struct sockaddr_in *)
					(rt->rt_gateway))->sin_addr;
		} else {
			m_freem(m);
			return ENETUNREACH;
		}
	} else {
		/* bidirectional configured tunnel mode */
		if (sin_dst->sin_addr.s_addr != INADDR_ANY)
			iphdr.ip_dst = sin_dst->sin_addr;
		else {
			m_freem(m);
			return ENETUNREACH;
		}
	}
	iphdr.ip_p = proto;
	/* version will be set in ip_output() */
	iphdr.ip_ttl = ip_gif_ttl;
	iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
	if (ifp->if_flags & IFF_LINK1)
		ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);

	/* prepend new IP header */
	M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
	if (m && m->m_len < sizeof(struct ip))
		m = m_pullup(m, sizeof(struct ip));
	if (m == NULL) {
		printf("ENOBUFS in in_gif_output %d\n", __LINE__);
		return ENOBUFS;
	}

	*(mtod(m, struct ip *)) = iphdr;

	if (dst->sin_family != sin_dst->sin_family ||
	    dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
		/* cache route doesn't match */
		dst->sin_family = sin_dst->sin_family;
		dst->sin_len = sizeof(struct sockaddr_in);
		dst->sin_addr = sin_dst->sin_addr;
		if (sc->gif_ro.ro_rt) {
			RTFREE(sc->gif_ro.ro_rt);
			sc->gif_ro.ro_rt = NULL;
		}
#if 0
		sc->gif_if.if_mtu = GIF_MTU;
#endif
	}

	if (sc->gif_ro.ro_rt == NULL) {
		rtalloc(&sc->gif_ro);
		if (sc->gif_ro.ro_rt == NULL) {
			m_freem(m);
			return ENETUNREACH;
		}
#if 0
		ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
			- sizeof(struct ip);
#endif
	}

#ifndef __OpenBSD__
	error = ip_output(m, NULL, &sc->gif_ro, 0, NULL);
#else
	error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
#endif
	return(error);
}

void
in_gif_input(m, off)
	struct mbuf *m;
	int off;
{
	struct gif_softc *sc;
	struct ifnet *gifp = NULL;
	struct ip *ip;
	int i, af, proto;
	u_int8_t otos;

	if (gif == NULL) {
		m_freem(m);
		return; 
	}

	ip = mtod(m, struct ip *);
        proto = ip->ip_p;

#if 0
	/* this code will be soon improved. */
#define	satosin(sa)	((struct sockaddr_in *)(sa))	
	for (i = 0, sc = gif; i < ngif; i++, sc++) {
		if (sc->gif_psrc == NULL
		 || sc->gif_pdst == NULL
		 || sc->gif_psrc->sa_family != AF_INET
		 || sc->gif_pdst->sa_family != AF_INET) {
			continue;
		}

		if ((sc->gif_if.if_flags & IFF_UP) == 0)
			continue;

		if ((sc->gif_if.if_flags & IFF_LINK0)
		 && satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr
		 && satosin(sc->gif_pdst)->sin_addr.s_addr == INADDR_ANY) {
			gifp = &sc->gif_if;
			continue;
		}

		if (satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr
		 && satosin(sc->gif_pdst)->sin_addr.s_addr == ip->ip_src.s_addr)
		{
			gifp = &sc->gif_if;
			break;
		}
	}
#else
	gifp = (struct ifnet *)encap_getarg(m);
#endif

	if (gifp == NULL) {
		/* for backward compatibility */
		if (proto == IPPROTO_IPV4) {
#ifdef __OpenBSD__
#if defined(MROUTING) || defined(IPSEC)
			ip4_input(m, off, proto);
			return;
#endif
#else
#if MROUTING
			ipip_input(m, off);
			return;
#endif /*MROUTING*/
#endif
		}
		m_freem(m);
		ipstat.ips_nogif++;
		return;
	}

	if ((gifp->if_flags & IFF_UP) == 0) {
		m_freem(m);
		ipstat.ips_nogif++;
		return;
	}

	otos = ip->ip_tos;
	m_adj(m, off);

	switch (proto) {
#if INET
	case IPPROTO_IPV4:
	    {
		struct ip *ip;
		af = AF_INET;
		if (m->m_len < sizeof(*ip)) {
			m = m_pullup(m, sizeof(*ip));
			if (!m)
				return;
		}
		ip = mtod(m, struct ip *);
		if (gifp->if_flags & IFF_LINK1)
			ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
		break;
	    }
#endif
#if INET6
	case IPPROTO_IPV6:
	    {
		struct ip6_hdr *ip6;
		u_int8_t itos;
		af = AF_INET6;
		if (m->m_len < sizeof(*ip6)) {
			m = m_pullup(m, sizeof(*ip6));
			if (!m)
				return;
		}
		ip6 = mtod(m, struct ip6_hdr *);
		itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
		if (gifp->if_flags & IFF_LINK1)
			ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
		ip6->ip6_flow &= ~htonl(0xff << 20);
		ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
		break;
	    }
#endif /* INET6 */
	default:
		ipstat.ips_nogif++;
		m_freem(m);
		return;
	}
	gif_input(m, af, gifp);
	return;
}

int
in_gif_ioctl(ifp, cmd, data)
	struct ifnet *ifp;
#if defined(__FreeBSD__) && __FreeBSD__ < 3
	int cmd;
#else
	u_long cmd;
#endif
	caddr_t data;
{
	struct gif_softc *sc  = (struct gif_softc*)ifp;
	struct ifreq     *ifr = (struct ifreq*)data;
	int error = 0, size;
	struct sockaddr *sa, *dst, *src;
	const struct encaptab *p;
	struct sockaddr_in smask4, dmask4;
		
	switch (cmd) {
	case SIOCSIFFLAGS:
		/*
		 * whenever we change our idea about multi-destination mode
		 * we need to update encap attachment.
		 */
		if (((ifp->if_flags ^ sc->gif_oflags) & IFF_LINK0) == 0)
			break;
		if (sc->gif_psrc == NULL || sc->gif_pdst == NULL ||
		    sc->gif_psrc->sa_family != sc->gif_pdst->sa_family)
			break;
		bzero(&smask4, sizeof(smask4));
		smask4.sin_addr.s_addr = ~0;
		dmask4 = smask4;
		if ((ifp->if_flags & IFF_LINK0) != 0 &&
		    ((struct sockaddr_in *)dst)->sin_addr.s_addr ==
				INADDR_ANY) {
			bzero(&dmask4, sizeof(dmask4));
		}
		p = encap_attach(sc->gif_psrc->sa_family, -1, sc->gif_psrc,
			(struct sockaddr *)&smask4, sc->gif_pdst,
			(struct sockaddr *)&dmask4,
			(struct protosw *)&in_gif_protosw, &sc->gif_if);
		if (p == NULL) {
			error = EINVAL;
			goto bad;
		}
		if (sc->encap_cookie != NULL)
			(void)encap_detach(sc->encap_cookie);
		sc->encap_cookie = p;
		sc->gif_oflags = ifp->if_flags;

		break;

	case SIOCSIFPHYADDR:
		switch (ifr->ifr_addr.sa_family) {
		case AF_INET:
			src = (struct sockaddr *)
				&(((struct in_aliasreq *)data)->ifra_addr);
			dst = (struct sockaddr *)
				&(((struct in_aliasreq *)data)->ifra_dstaddr);

			bzero(&smask4, sizeof(smask4));
			smask4.sin_addr.s_addr = ~0;
			dmask4 = smask4;
			if ((ifp->if_flags & IFF_LINK0) != 0 &&
			    ((struct sockaddr_in *)dst)->sin_addr.s_addr ==
					INADDR_ANY) {
				bzero(&dmask4, sizeof(dmask4));
			}
			size = sizeof(struct sockaddr_in);
			break;
		default:
			error = EAFNOSUPPORT;
			goto bad;
		}

		if (sc->encap_cookie)
			(void)encap_detach(sc->encap_cookie);
		if (sc->gif_psrc != NULL) {
			_FREE((caddr_t)sc->gif_psrc, M_IFADDR);
			sc->gif_psrc = NULL;
		}
		if (sc->gif_pdst != NULL) {
			_FREE((caddr_t)sc->gif_pdst, M_IFADDR);
			sc->gif_pdst = NULL;
		}

		p = encap_attach(ifr->ifr_addr.sa_family, -1, src,
			(struct sockaddr *)&smask4, dst,
			(struct sockaddr *)&dmask4,
			(struct protosw *)&in_gif_protosw, &sc->gif_if);
		if (p == NULL) {
			error = EINVAL;
			goto bad;
		}
		sc->encap_cookie = p;
		sc->gif_oflags = ifp->if_flags;

		sa = (struct sockaddr *)_MALLOC(size, M_IFADDR, M_WAITOK);
		if (sa == NULL)
			return (ENOMEM);
		bcopy((caddr_t)src, (caddr_t)sa, size);
		sc->gif_psrc = sa;
		
		sa = (struct sockaddr *)_MALLOC(size, M_IFADDR, M_WAITOK);
		if (sa == NULL)
			return (ENOMEM);
		bcopy((caddr_t)dst, (caddr_t)sa, size);
		sc->gif_pdst = sa;
		
		ifp->if_flags |= IFF_UP;
		if_up(ifp);		/* send up RTM_IFINFO */

		error = 0;
		break;
	default:
		error = EINVAL;
		goto bad;
	}

 bad:
	return error;
}
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/* $KAME: in_gif.c,v 1.27 2000/03/30 01:29:05 jinmei Exp $ */
	23
	24	/*
	25	* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
	26	* All rights reserved.
	27	*
	28	* Redistribution and use in source and binary forms, with or without
	29	* modification, are permitted provided that the following conditions
	30	* are met:
	31	* 1. Redistributions of source code must retain the above copyright
	32	* notice, this list of conditions and the following disclaimer.
	33	* 2. Redistributions in binary form must reproduce the above copyright
	34	* notice, this list of conditions and the following disclaimer in the
	35	* documentation and/or other materials provided with the distribution.
	36	* 3. Neither the name of the project nor the names of its contributors
	37	* may be used to endorse or promote products derived from this software
	38	* without specific prior written permission.
	39	*
	40	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	41	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	42	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	43	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	44	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	45	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	46	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	47	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	48	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	49	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	50	* SUCH DAMAGE.
	51	*/
	52
	53	/*
	54	* in_gif.c
	55	*/
	56	#if BSD310
	57	#include "opt_mrouting.h"
	58	#if defined(__FreeBSD__) && __FreeBSD__ >= 3
	59	#include "opt_inet.h"
	60	#endif
	61	#endif
	62
	63	#include <sys/param.h>
	64	#include <sys/systm.h>
65	#include <sys/socket.h>
66	#include <sys/sockio.h>
67	#include <sys/sysctl.h>
68	#include <sys/mbuf.h>
69	#include <sys/errno.h>
70	#ifdef __FreeBSD__
71	#include <sys/kernel.h>
72	#include <sys/sysctl.h>
73	#endif
74	#if !defined(__FreeBSD__) \|\| __FreeBSD__ < 3
75	#include <sys/ioctl.h>
76	#endif
77	#include <sys/protosw.h>
78
79	#if defined(__FreeBSD__) && __FreeBSD__ >= 3 \|\| defined (__APPLE__)
80	#include <sys/malloc.h>
81	#endif
82
83	#include <net/if.h>
84	#include <net/route.h>
85	#include <net/if_gif.h>
86
87	#include <netinet/in.h>
88	#include <netinet/in_systm.h>
89	#include <netinet/ip.h>
90	#include <netinet/ip_var.h>
91	#include <netinet/in_gif.h>
92	#include <netinet/in_var.h>
93	#include <netinet/ip_encap.h>
94	#include <netinet/ip_ecn.h>
95
96	#if INET6
97	#include <netinet/ip6.h>
98	#endif
99
100	#if MROUTING
101	#include <netinet/ip_mroute.h>
102	#endif /* MROUTING */
103
104	#include <net/if_gif.h>
105
106	#include "gif.h"
107
108	#include <net/net_osdep.h>
109
110	#if NGIF > 0
111	int ip_gif_ttl = GIF_TTL;
112	#else
113	int ip_gif_ttl = 0;
114	#endif
115
116	extern struct protosw in_gif_protosw;
117
118	SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl,
119	CTLFLAG_RW, &ip_gif_ttl , 0, "");
120
121	int
122	in_gif_output(ifp, family, m, rt)
123	struct ifnet *ifp;
124	int family;
125	struct mbuf *m;
126	struct rtentry *rt;
127	{
128	register struct gif_softc sc = (struct gif_softc)ifp;
129	struct sockaddr_in dst = (struct sockaddr_in )&sc->gif_ro.ro_dst;
130	struct sockaddr_in sin_src = (struct sockaddr_in )sc->gif_psrc;
131	struct sockaddr_in sin_dst = (struct sockaddr_in )sc->gif_pdst;
132	struct ip iphdr; /* capsule IP header, host byte ordered */
133	int proto, error;
134	u_int8_t tos;
135
136	if (sin_src == NULL \|\| sin_dst == NULL \|\|
137	sin_src->sin_family != AF_INET \|\|
138	sin_dst->sin_family != AF_INET) {
139	printf("in_gif_output: unknown family src=%x dst=%x\n", sin_src->sin_family, sin_dst->sin_family);
140	m_freem(m);
141	return EAFNOSUPPORT;
142	}
143
144	switch (family) {
145	#if INET
146	case AF_INET:
147	{
148	struct ip *ip;
149
150	proto = IPPROTO_IPV4;
151	if (m->m_len < sizeof(*ip)) {
152	m = m_pullup(m, sizeof(*ip));
153	if (!m)
154	return ENOBUFS;
155	}
156	ip = mtod(m, struct ip *);
157	tos = ip->ip_tos;
158	break;
159	}
160	#endif /INET/
161	#if INET6
162	case AF_INET6:
163	{
164	struct ip6_hdr *ip6;
165	proto = IPPROTO_IPV6;
166	if (m->m_len < sizeof(*ip6)) {
167	m = m_pullup(m, sizeof(*ip6));
168	if (!m)
169	return ENOBUFS;
170	}
171	ip6 = mtod(m, struct ip6_hdr *);
172	tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
173	break;
174	}
175	#endif /INET6/
176	default:
177	#if DEBUG
178	printf("in_gif_output: warning: unknown family %d passed\n",
179	family);
180	#endif
181	m_freem(m);
182	return EAFNOSUPPORT;
183	}
184
185	bzero(&iphdr, sizeof(iphdr));
186	iphdr.ip_src = sin_src->sin_addr;
187	if (ifp->if_flags & IFF_LINK0) {
188	/* multi-destination mode */
189	if (sin_dst->sin_addr.s_addr != INADDR_ANY)
190	iphdr.ip_dst = sin_dst->sin_addr;
191	else if (rt) {
192	if (family != AF_INET) {
193	m_freem(m);
194	return EINVAL; /XXX/
195	}
196	iphdr.ip_dst = ((struct sockaddr_in *)
197	(rt->rt_gateway))->sin_addr;
198	} else {
199	m_freem(m);
200	return ENETUNREACH;
201	}
202	} else {
203	/* bidirectional configured tunnel mode */
204	if (sin_dst->sin_addr.s_addr != INADDR_ANY)
205	iphdr.ip_dst = sin_dst->sin_addr;
206	else {
207	m_freem(m);
208	return ENETUNREACH;
209	}
210	}
211	iphdr.ip_p = proto;
212	/* version will be set in ip_output() */
213	iphdr.ip_ttl = ip_gif_ttl;
214	iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
215	if (ifp->if_flags & IFF_LINK1)
216	ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
217
218	/* prepend new IP header */
219	M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
220	if (m && m->m_len < sizeof(struct ip))
221	m = m_pullup(m, sizeof(struct ip));
222	if (m == NULL) {
223	printf("ENOBUFS in in_gif_output %d\n", __LINE__);
224	return ENOBUFS;
225	}
226
227	(mtod(m, struct ip )) = iphdr;
228
229	if (dst->sin_family != sin_dst->sin_family \|\|
230	dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
231	/* cache route doesn't match */
232	dst->sin_family = sin_dst->sin_family;
233	dst->sin_len = sizeof(struct sockaddr_in);
234	dst->sin_addr = sin_dst->sin_addr;
235	if (sc->gif_ro.ro_rt) {
236	RTFREE(sc->gif_ro.ro_rt);
237	sc->gif_ro.ro_rt = NULL;
238	}
239	#if 0
240	sc->gif_if.if_mtu = GIF_MTU;
241	#endif
242	}
243
244	if (sc->gif_ro.ro_rt == NULL) {
245	rtalloc(&sc->gif_ro);
246	if (sc->gif_ro.ro_rt == NULL) {
247	m_freem(m);
248	return ENETUNREACH;
249	}
250	#if 0
251	ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
252	- sizeof(struct ip);
253	#endif
254	}
255
256	#ifndef __OpenBSD__
257	error = ip_output(m, NULL, &sc->gif_ro, 0, NULL);
258	#else
259	error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL);
260	#endif
261	return(error);
262	}
263
264	void
265	in_gif_input(m, off)
266	struct mbuf *m;
267	int off;
268	{
269	struct gif_softc *sc;
270	struct ifnet *gifp = NULL;
271	struct ip *ip;
272	int i, af, proto;
273	u_int8_t otos;
274
275	if (gif == NULL) {
276	m_freem(m);
277	return;
278	}
279
280	ip = mtod(m, struct ip *);
281	proto = ip->ip_p;
282
283	#if 0
284	/* this code will be soon improved. */
285	#define satosin(sa) ((struct sockaddr_in *)(sa))
286	for (i = 0, sc = gif; i < ngif; i++, sc++) {
287	if (sc->gif_psrc == NULL
288	\|\| sc->gif_pdst == NULL
289	\|\| sc->gif_psrc->sa_family != AF_INET
290	\|\| sc->gif_pdst->sa_family != AF_INET) {
291	continue;
292	}
293
294	if ((sc->gif_if.if_flags & IFF_UP) == 0)
295	continue;
296
297	if ((sc->gif_if.if_flags & IFF_LINK0)
298	&& satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr
299	&& satosin(sc->gif_pdst)->sin_addr.s_addr == INADDR_ANY) {
300	gifp = &sc->gif_if;
301	continue;
302	}
303
304	if (satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr
305	&& satosin(sc->gif_pdst)->sin_addr.s_addr == ip->ip_src.s_addr)
306	{
307	gifp = &sc->gif_if;
308	break;
309	}
310	}
311	#else
312	gifp = (struct ifnet *)encap_getarg(m);
313	#endif
314
315	if (gifp == NULL) {
316	/* for backward compatibility */
317	if (proto == IPPROTO_IPV4) {
318	#ifdef __OpenBSD__
319	#if defined(MROUTING) \|\| defined(IPSEC)
320	ip4_input(m, off, proto);
321	return;
322	#endif
323	#else
324	#if MROUTING
325	ipip_input(m, off);
326	return;
327	#endif /MROUTING/
328	#endif
329	}
330	m_freem(m);
331	ipstat.ips_nogif++;
332	return;
333	}
334
335	if ((gifp->if_flags & IFF_UP) == 0) {
336	m_freem(m);
337	ipstat.ips_nogif++;
338	return;
339	}
340
341	otos = ip->ip_tos;
342	m_adj(m, off);
343
344	switch (proto) {
345	#if INET
346	case IPPROTO_IPV4:
347	{
348	struct ip *ip;
349	af = AF_INET;
350	if (m->m_len < sizeof(*ip)) {
351	m = m_pullup(m, sizeof(*ip));
352	if (!m)
353	return;
354	}
355	ip = mtod(m, struct ip *);
356	if (gifp->if_flags & IFF_LINK1)
357	ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
358	break;
359	}
360	#endif
361	#if INET6
362	case IPPROTO_IPV6:
363	{
364	struct ip6_hdr *ip6;
365	u_int8_t itos;
366	af = AF_INET6;
367	if (m->m_len < sizeof(*ip6)) {
368	m = m_pullup(m, sizeof(*ip6));
369	if (!m)
370	return;
371	}
372	ip6 = mtod(m, struct ip6_hdr *);
373	itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
374	if (gifp->if_flags & IFF_LINK1)
375	ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
376	ip6->ip6_flow &= ~htonl(0xff << 20);
377	ip6->ip6_flow \|= htonl((u_int32_t)itos << 20);
378	break;
379	}
380	#endif /* INET6 */
381	default:
382	ipstat.ips_nogif++;
383	m_freem(m);
384	return;
385	}
386	gif_input(m, af, gifp);
387	return;
388	}
389
390	int
391	in_gif_ioctl(ifp, cmd, data)
392	struct ifnet *ifp;
393	#if defined(__FreeBSD__) && __FreeBSD__ < 3
394	int cmd;
395	#else
396	u_long cmd;
397	#endif
398	caddr_t data;
399	{
400	struct gif_softc sc = (struct gif_softc)ifp;
401	struct ifreq ifr = (struct ifreq)data;
402	int error = 0, size;
403	struct sockaddr sa, dst, *src;
404	const struct encaptab *p;
405	struct sockaddr_in smask4, dmask4;
406
407	switch (cmd) {
408	case SIOCSIFFLAGS:
409	/*
410	* whenever we change our idea about multi-destination mode
411	* we need to update encap attachment.
412	*/
413	if (((ifp->if_flags ^ sc->gif_oflags) & IFF_LINK0) == 0)
414	break;
415	if (sc->gif_psrc == NULL \|\| sc->gif_pdst == NULL \|\|
416	sc->gif_psrc->sa_family != sc->gif_pdst->sa_family)
417	break;
418	bzero(&smask4, sizeof(smask4));
419	smask4.sin_addr.s_addr = ~0;
420	dmask4 = smask4;
421	if ((ifp->if_flags & IFF_LINK0) != 0 &&
422	((struct sockaddr_in *)dst)->sin_addr.s_addr ==
423	INADDR_ANY) {
424	bzero(&dmask4, sizeof(dmask4));
425	}
426	p = encap_attach(sc->gif_psrc->sa_family, -1, sc->gif_psrc,
427	(struct sockaddr *)&smask4, sc->gif_pdst,
428	(struct sockaddr *)&dmask4,
429	(struct protosw *)&in_gif_protosw, &sc->gif_if);
430	if (p == NULL) {
431	error = EINVAL;
432	goto bad;
433	}
434	if (sc->encap_cookie != NULL)
435	(void)encap_detach(sc->encap_cookie);
436	sc->encap_cookie = p;
437	sc->gif_oflags = ifp->if_flags;
438
439	break;
440
441	case SIOCSIFPHYADDR:
442	switch (ifr->ifr_addr.sa_family) {
443	case AF_INET:
444	src = (struct sockaddr *)
445	&(((struct in_aliasreq *)data)->ifra_addr);
446	dst = (struct sockaddr *)
447	&(((struct in_aliasreq *)data)->ifra_dstaddr);
448
449	bzero(&smask4, sizeof(smask4));
450	smask4.sin_addr.s_addr = ~0;
451	dmask4 = smask4;
452	if ((ifp->if_flags & IFF_LINK0) != 0 &&
453	((struct sockaddr_in *)dst)->sin_addr.s_addr ==
454	INADDR_ANY) {
455	bzero(&dmask4, sizeof(dmask4));
456	}
457	size = sizeof(struct sockaddr_in);
458	break;
459	default:
460	error = EAFNOSUPPORT;
461	goto bad;
462	}
463
464	if (sc->encap_cookie)
465	(void)encap_detach(sc->encap_cookie);
466	if (sc->gif_psrc != NULL) {
467	_FREE((caddr_t)sc->gif_psrc, M_IFADDR);
468	sc->gif_psrc = NULL;
469	}
470	if (sc->gif_pdst != NULL) {
471	_FREE((caddr_t)sc->gif_pdst, M_IFADDR);
472	sc->gif_pdst = NULL;
473	}
474
475	p = encap_attach(ifr->ifr_addr.sa_family, -1, src,
476	(struct sockaddr *)&smask4, dst,
477	(struct sockaddr *)&dmask4,
478	(struct protosw *)&in_gif_protosw, &sc->gif_if);
479	if (p == NULL) {
480	error = EINVAL;
481	goto bad;
482	}
483	sc->encap_cookie = p;
484	sc->gif_oflags = ifp->if_flags;
485
486	sa = (struct sockaddr *)_MALLOC(size, M_IFADDR, M_WAITOK);
0b4e3aa0 A	487	if (sa == NULL)
0b4e3aa0 A	488	return (ENOMEM);
1c79356b A	489	bcopy((caddr_t)src, (caddr_t)sa, size);
	490	sc->gif_psrc = sa;
	491
	492	sa = (struct sockaddr *)_MALLOC(size, M_IFADDR, M_WAITOK);
0b4e3aa0 A	493	if (sa == NULL)
0b4e3aa0 A	494	return (ENOMEM);
1c79356b A	495	bcopy((caddr_t)dst, (caddr_t)sa, size);
	496	sc->gif_pdst = sa;
	497
	498	ifp->if_flags \|= IFF_UP;
	499	if_up(ifp); /* send up RTM_IFINFO */
	500
	501	error = 0;
	502	break;
	503	default:
	504	error = EINVAL;
	505	goto bad;
	506	}
	507
	508	bad:
	509	return error;
	510	}