[apple/xnu.git] / bsd / net / if_faith.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: if_faith.c,v 1.11 2000/02/22 14:01:46 itojun Exp $	*/

/*
 * Copyright (c) 1982, 1986, 1993
 *	The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 */
/*
 * derived from
 *	@(#)if_loop.c	8.1 (Berkeley) 6/10/93
 * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
 */

/*
 * Loopback interface driver for protocol testing and timing.
 */
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
#include "opt_inet.h"
#endif

#include "faith.h"
#if NFAITH > 0

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/errno.h>
#if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined(__APPLE__)
#include <sys/sockio.h>
#else
#include <sys/ioctl.h>
#endif
#include <sys/time.h>
#if defined(__bsdi__) || defined(__NetBSD__)
#include <machine/cpu.h>
#endif

#include <net/if.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/bpf.h>

#if	INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#endif

#if INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#endif

#include <net/dlil.h>
#include "faith.h"
#include "bpfilter.h"

#include <net/net_osdep.h>

#if defined(__FreeBSD__) && __FreeBSD__ < 3
static int faithioctl __P((struct ifnet *, int, caddr_t));
#else
static int faithioctl __P((struct ifnet *, u_long, caddr_t));
#endif
int faith_pre_output __P((struct ifnet *, register struct mbuf **, struct sockaddr *,
	register struct rtentry *, char *, char *, u_long));
static void faithrtrequest __P((int, struct rtentry *, struct sockaddr *));

#if defined(__FreeBSD__) || defined (__APPLE__)
void faithattach __P((void *));
#else
void faithattach __P((int));
#endif

#define HAVE_OLD_BPF 1

static struct ifnet faithif[NFAITH];
static struct if_proto *faith_array[NFAITH];
static int faith_count = 0;

#define	FAITHMTU	1500

static
int  faith_add_if(struct ifnet *ifp)
{
    ifp->if_demux  = 0;
    ifp->if_framer = 0;
    return 0;
}

static 
int  faith_del_if(struct ifnet *ifp)
{
    return 0;
}

static
int  faith_add_proto(struct ddesc_head_str *desc_head, struct if_proto *proto, u_long dl_tag)
{       
    int i;
    
    for (i=0; i < faith_count; i++)
        if (faith_array[i] == 0) {
            faith_array[faith_count] = proto;
            return 0;
        }
    
    if ((i == faith_count) && (faith_count == NFAITH))
       panic("faith_add_proto -- Too many attachments\n");

    faith_array[faith_count++] = proto;

    return (0);
}

static
int  faith_del_proto(struct if_proto *proto, u_long dl_tag)
{   
    int i;


    for (i=0; i < faith_count; i++)
        if (faith_array[i] == proto) {
            faith_array[i] = 0;
            return 0;
        }

    return ENOENT;
}

int faith_shutdown()
{
    return 0;
}

void faith_reg_if_mods()
{   
     struct dlil_ifmod_reg_str  faith_ifmod;

     faith_ifmod.add_if = faith_add_if;
     faith_ifmod.del_if = faith_del_if;
     faith_ifmod.add_proto = faith_add_proto;
     faith_ifmod.del_proto = faith_del_proto;
     faith_ifmod.ifmod_ioctl = 0;
     faith_ifmod.shutdown    = faith_shutdown;

    
    if (dlil_reg_if_modules(APPLE_IF_FAM_FAITH, &faith_ifmod))
        panic("Couldn't register faith modules\n");
    
}   
    
u_long  faith_attach_inet(struct ifnet *ifp)
{       
    struct dlil_proto_reg_str   reg;
    struct dlil_demux_desc      desc;
    u_long                      dl_tag=0;
    short native=0;
    int   stat;
    int i;

    for (i=0; i < faith_count; i++) {
        if (faith_array[i] && (faith_array[i]->ifp == ifp) &&
            (faith_array[i]->protocol_family == PF_INET)) {
#if 0
	        kprintf("faith_array for %s%d found dl_tag=%d\n",
                       ifp->if_name, ifp->if_unit, faith_array[i]->dl_tag);
#endif
                return faith_array[i]->dl_tag;
       
        }
    }

    TAILQ_INIT(&reg.demux_desc_head); 
    desc.type = DLIL_DESC_RAW;
    desc.variants.bitmask.proto_id_length = 0;
    desc.variants.bitmask.proto_id = 0;
    desc.variants.bitmask.proto_id_mask = 0;
    desc.native_type = (char *) &native;
    TAILQ_INSERT_TAIL(&reg.demux_desc_head, &desc, next);
    reg.interface_family = ifp->if_family;
    reg.unit_number      = ifp->if_unit;
    reg.input            = 0;
    reg.pre_output       = faith_pre_output;
    reg.event            = 0;
    reg.offer            = 0;
    reg.ioctl            = faithioctl;
    reg.default_proto    = 0;
    reg.protocol_family  = PF_INET;

    stat = dlil_attach_protocol(&reg, &dl_tag);
    if (stat) {
        panic("faith_attach_inet can't attach interface\n");
    }

    return dl_tag;
}

void
faithattach(faith)
	void *faith;
{
	struct ifnet *ifp;
	int i;

	faith_reg_if_mods(); /* DLIL modules */

	for (i = 0; i < NFAITH; i++) {
		ifp = &faithif[i];
		bzero(ifp, sizeof(faithif[i]));
		ifp->if_name = "faith";
		ifp->if_unit = i;
		ifp->if_family = APPLE_IF_FAM_FAITH;
		ifp->if_mtu = FAITHMTU;
		/* Change to BROADCAST experimentaly to announce its prefix. */
		ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
		ifp->if_ioctl = faithioctl;
		ifp->if_output = NULL;
		ifp->if_type = IFT_FAITH;
		ifp->if_hdrlen = 0;
		ifp->if_addrlen = 0;
		dlil_if_attach(ifp);
#if NBPFILTER > 0
#ifdef HAVE_OLD_BPF
		bpfattach(ifp, DLT_NULL, sizeof(u_int));
#else
		bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int));
#endif
#endif
	}
}

int
faith_pre_output(ifp, m0, dst, rt, frame_type, dst_addr, dl_tag)
	struct ifnet *ifp;
	register struct mbuf **m0;
	struct sockaddr *dst;
	register struct rtentry *rt;
	char		     *frame_type;
	char		     *dst_addr;
	u_long		     dl_tag;
{
	int s, isr;
	register struct ifqueue *ifq = 0;
	register struct mbuf *m = *m0;

	if ((m->m_flags & M_PKTHDR) == 0)
		panic("faithoutput no HDR");
#if NBPFILTER > 0
	/* BPF write needs to be handled specially */
	if (dst && dst->sa_family == AF_UNSPEC) {
		dst->sa_family = *(mtod(m, int *));
		m->m_len -= sizeof(int);
		m->m_pkthdr.len -= sizeof(int);
		m->m_data += sizeof(int);
	}

	if (ifp->if_bpf) {
		/*
		 * We need to prepend the address family as
		 * a four byte field.  Cons up a faith header
		 * to pacify bpf.  This is safe because bpf
		 * will only read from the mbuf (i.e., it won't
		 * try to free it or keep a pointer a to it).
		 */
		struct mbuf m0;
		u_int af = dst->sa_family;

		m0.m_next = m;
		m0.m_len = 4;
		m0.m_data = (char *)&af;

#if HAVE_OLD_BPF
		bpf_mtap(ifp, &m0);
#else
		bpf_mtap(ifp->if_bpf, &m0);
#endif
	}
#endif

	if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
		m_freem(m);
		return (EJUSTRETURN);
//		return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
//		        rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
	}
	ifp->if_opackets++;
	ifp->if_obytes += m->m_pkthdr.len;
	switch (dst->sa_family) {
#if INET
	case AF_INET:
		ifq = &ipintrq;
		isr = NETISR_IP;
		break;
#endif
#if INET6
	case AF_INET6:
		ifq = &ip6intrq;
		isr = NETISR_IPV6;
		break;
#endif
	default:
		kprintf("faith_pre_output: m=%x family is unknown...(0x%x\n", m, dst->sa_family);
		m_freem(m);
		return EAFNOSUPPORT;
	}

	/* XXX do we need more sanity checks? */

	m->m_pkthdr.rcvif = ifp;
	s = splimp();
	if (IF_QFULL(ifq)) {
		IF_DROP(ifq);
		m_freem(m);
		splx(s);
		return (EJUSTRETURN);
	}
	IF_ENQUEUE(ifq, m);
	schednetisr(isr);
	ifp->if_ipackets++;
	ifp->if_ibytes += m->m_pkthdr.len;
	splx(s);
	return (EJUSTRETURN);
}

/* ARGSUSED */
static void
faithrtrequest(cmd, rt, sa)
	int cmd;
	struct rtentry *rt;
	struct sockaddr *sa;
{
	if (rt) {
		rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
		/*
		 * For optimal performance, the send and receive buffers
		 * should be at least twice the MTU plus a little more for
		 * overhead.
		 */
		rt->rt_rmx.rmx_recvpipe =
			rt->rt_rmx.rmx_sendpipe = 3 * FAITHMTU;
	}
}

/*
 * Process an ioctl request.
 */
/* ARGSUSED */
static int
faithioctl(ifp, cmd, data)
	register struct ifnet *ifp;
#if defined(__FreeBSD__) && __FreeBSD__ < 3
	int cmd;
#else
	u_long cmd;
#endif
	caddr_t data;
{
	register struct ifaddr *ifa;
	register struct ifreq *ifr = (struct ifreq *)data;
	register int error = 0;

	switch (cmd) {

	case SIOCSIFADDR:
		ifp->if_flags |= IFF_UP | IFF_RUNNING;
		ifa = (struct ifaddr *)data;
		ifa->ifa_rtrequest = faithrtrequest;
		/*
		 * Everything else is done at a higher level.
		 */
		break;

	case SIOCADDMULTI:
	case SIOCDELMULTI:
		if (ifr == 0) {
			error = EAFNOSUPPORT;		/* XXX */
			break;
		}
		switch (ifr->ifr_addr.sa_family) {
#if INET
		case AF_INET:
			break;
#endif
#if INET6
		case AF_INET6:
			break;
#endif

		default:
			error = EAFNOSUPPORT;
			break;
		}
		break;

#ifdef SIOCSIFMTU
#ifndef __OpenBSD__
	case SIOCSIFMTU:
		ifp->if_mtu = ifr->ifr_mtu;
		break;
#endif
#endif

	case SIOCSIFFLAGS:
		break;

	default:
		error = EINVAL;
	}
	return (error);
}
#endif /* NFAITH > 0 */
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: if_faith.c,v 1.11 2000/02/22 14:01:46 itojun Exp $ */
	23
	24	/*
	25	* Copyright (c) 1982, 1986, 1993
	26	* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
	37	* must display the following acknowledgement:
	38	* This product includes software developed by the University of
	39	* California, Berkeley and its contributors.
	40	* 4. Neither the name of the University nor the names of its contributors
	41	* may be used to endorse or promote products derived from this software
	42	* without specific prior written permission.
	43	*
	44	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	45	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	46	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	47	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	48	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	49	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	50	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	51	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	52	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	53	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	54	* SUCH DAMAGE.
	55	*/
	56	/*
	57	* derived from
	58	* @(#)if_loop.c 8.1 (Berkeley) 6/10/93
	59	* Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
	60	*/
	61
	62	/*
	63	* Loopback interface driver for protocol testing and timing.
	64	*/
65	#if defined(__FreeBSD__) && __FreeBSD__ >= 3
66	#include "opt_inet.h"
67	#endif
68
69	#include "faith.h"
70	#if NFAITH > 0
71
72	#include <sys/param.h>
73	#include <sys/systm.h>
74	#include <sys/kernel.h>
75	#include <sys/mbuf.h>
76	#include <sys/socket.h>
77	#include <sys/errno.h>
78	#if defined(__FreeBSD__) && __FreeBSD__ >= 3 \|\| defined(__APPLE__)
79	#include <sys/sockio.h>
80	#else
81	#include <sys/ioctl.h>
82	#endif
83	#include <sys/time.h>
84	#if defined(__bsdi__) \|\| defined(__NetBSD__)
85	#include <machine/cpu.h>
86	#endif
87
88	#include <net/if.h>
89	#include <net/if_types.h>
90	#include <net/netisr.h>
91	#include <net/route.h>
92	#include <net/bpf.h>
93
94	#if INET
95	#include <netinet/in.h>
96	#include <netinet/in_systm.h>
97	#include <netinet/in_var.h>
98	#include <netinet/ip.h>
99	#endif
100
101	#if INET6
102	#ifndef INET
103	#include <netinet/in.h>
104	#endif
105	#include <netinet6/in6_var.h>
106	#include <netinet/ip6.h>
107	#endif
108
109	#include <net/dlil.h>
110	#include "faith.h"
111	#include "bpfilter.h"
112
113	#include <net/net_osdep.h>
114
115	#if defined(__FreeBSD__) && __FreeBSD__ < 3
116	static int faithioctl __P((struct ifnet *, int, caddr_t));
117	#else
118	static int faithioctl __P((struct ifnet *, u_long, caddr_t));
119	#endif
120	int faith_pre_output __P((struct ifnet , register struct mbuf , struct sockaddr ,
121	register struct rtentry , char , char *, u_long));
122	static void faithrtrequest __P((int, struct rtentry , struct sockaddr ));
123
124	#if defined(__FreeBSD__) \|\| defined (__APPLE__)
125	void faithattach __P((void *));
126	#else
127	void faithattach __P((int));
128	#endif
129
130	#define HAVE_OLD_BPF 1
131
132	static struct ifnet faithif[NFAITH];
133	static struct if_proto *faith_array[NFAITH];
134	static int faith_count = 0;
135
136	#define FAITHMTU 1500
137
138	static
139	int faith_add_if(struct ifnet *ifp)
140	{
141	ifp->if_demux = 0;
142	ifp->if_framer = 0;
143	return 0;
144	}
145
146	static
147	int faith_del_if(struct ifnet *ifp)
148	{
149	return 0;
150	}
151
152	static
153	int faith_add_proto(struct ddesc_head_str desc_head, struct if_proto proto, u_long dl_tag)
154	{
155	int i;
156
157	for (i=0; i < faith_count; i++)
158	if (faith_array[i] == 0) {
159	faith_array[faith_count] = proto;
160	return 0;
161	}
162
163	if ((i == faith_count) && (faith_count == NFAITH))
164	panic("faith_add_proto -- Too many attachments\n");
165
166	faith_array[faith_count++] = proto;
167
168	return (0);
169	}
170
171	static
172	int faith_del_proto(struct if_proto *proto, u_long dl_tag)
173	{
174	int i;
175
176
177	for (i=0; i < faith_count; i++)
178	if (faith_array[i] == proto) {
179	faith_array[i] = 0;
180	return 0;
181	}
182
183	return ENOENT;
184	}
185
186	int faith_shutdown()
187	{
188	return 0;
189	}
190
191	void faith_reg_if_mods()
192	{
193	struct dlil_ifmod_reg_str faith_ifmod;
194
195	faith_ifmod.add_if = faith_add_if;
196	faith_ifmod.del_if = faith_del_if;
197	faith_ifmod.add_proto = faith_add_proto;
198	faith_ifmod.del_proto = faith_del_proto;
199	faith_ifmod.ifmod_ioctl = 0;
200	faith_ifmod.shutdown = faith_shutdown;
201
202
203	if (dlil_reg_if_modules(APPLE_IF_FAM_FAITH, &faith_ifmod))
204	panic("Couldn't register faith modules\n");
205
206	}
207
208	u_long faith_attach_inet(struct ifnet *ifp)
209	{
210	struct dlil_proto_reg_str reg;
211	struct dlil_demux_desc desc;
212	u_long dl_tag=0;
213	short native=0;
214	int stat;
215	int i;
216
217	for (i=0; i < faith_count; i++) {
218	if (faith_array[i] && (faith_array[i]->ifp == ifp) &&
219	(faith_array[i]->protocol_family == PF_INET)) {
220	#if 0
221	kprintf("faith_array for %s%d found dl_tag=%d\n",
222	ifp->if_name, ifp->if_unit, faith_array[i]->dl_tag);
223	#endif
224	return faith_array[i]->dl_tag;
225
226	}
227	}
228
229	TAILQ_INIT(&reg.demux_desc_head);
230	desc.type = DLIL_DESC_RAW;
231	desc.variants.bitmask.proto_id_length = 0;
232	desc.variants.bitmask.proto_id = 0;
233	desc.variants.bitmask.proto_id_mask = 0;
234	desc.native_type = (char *) &native;
235	TAILQ_INSERT_TAIL(&reg.demux_desc_head, &desc, next);
236	reg.interface_family = ifp->if_family;
237	reg.unit_number = ifp->if_unit;
238	reg.input = 0;
239	reg.pre_output = faith_pre_output;
240	reg.event = 0;
241	reg.offer = 0;
242	reg.ioctl = faithioctl;
243	reg.default_proto = 0;
244	reg.protocol_family = PF_INET;
245
246	stat = dlil_attach_protocol(&reg, &dl_tag);
247	if (stat) {
248	panic("faith_attach_inet can't attach interface\n");
249	}
250
251	return dl_tag;
252	}
253
254	void
255	faithattach(faith)
256	void *faith;
257	{
258	struct ifnet *ifp;
259	int i;
260
261	faith_reg_if_mods(); /* DLIL modules */
262
263	for (i = 0; i < NFAITH; i++) {
264	ifp = &faithif[i];
265	bzero(ifp, sizeof(faithif[i]));
266	ifp->if_name = "faith";
267	ifp->if_unit = i;
268	ifp->if_family = APPLE_IF_FAM_FAITH;
269	ifp->if_mtu = FAITHMTU;
270	/* Change to BROADCAST experimentaly to announce its prefix. */
271	ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST \| IFF_MULTICAST;
272	ifp->if_ioctl = faithioctl;
273	ifp->if_output = NULL;
274	ifp->if_type = IFT_FAITH;
275	ifp->if_hdrlen = 0;
276	ifp->if_addrlen = 0;
277	dlil_if_attach(ifp);
278	#if NBPFILTER > 0
279	#ifdef HAVE_OLD_BPF
280	bpfattach(ifp, DLT_NULL, sizeof(u_int));
281	#else
282	bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int));
283	#endif
284	#endif
285	}
286	}
287
288	int
289	faith_pre_output(ifp, m0, dst, rt, frame_type, dst_addr, dl_tag)
290	struct ifnet *ifp;
291	register struct mbuf **m0;
292	struct sockaddr *dst;
293	register struct rtentry *rt;
294	char *frame_type;
295	char *dst_addr;
296	u_long dl_tag;
297	{
298	int s, isr;
299	register struct ifqueue *ifq = 0;
300	register struct mbuf m = m0;
301
302	if ((m->m_flags & M_PKTHDR) == 0)
303	panic("faithoutput no HDR");
304	#if NBPFILTER > 0
305	/* BPF write needs to be handled specially */
306	if (dst && dst->sa_family == AF_UNSPEC) {
307	dst->sa_family = (mtod(m, int ));
308	m->m_len -= sizeof(int);
309	m->m_pkthdr.len -= sizeof(int);
310	m->m_data += sizeof(int);
311	}
312
313	if (ifp->if_bpf) {
314	/*
315	* We need to prepend the address family as
316	* a four byte field. Cons up a faith header
317	* to pacify bpf. This is safe because bpf
318	* will only read from the mbuf (i.e., it won't
319	* try to free it or keep a pointer a to it).
320	*/
321	struct mbuf m0;
322	u_int af = dst->sa_family;
323
324	m0.m_next = m;
325	m0.m_len = 4;
326	m0.m_data = (char *)⁡
327
328	#if HAVE_OLD_BPF
329	bpf_mtap(ifp, &m0);
330	#else
331	bpf_mtap(ifp->if_bpf, &m0);
332	#endif
333	}
334	#endif
335
336	if (rt && rt->rt_flags & (RTF_REJECT\|RTF_BLACKHOLE)) {
337	m_freem(m);
338	return (EJUSTRETURN);
339	// return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
340	// rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
341	}
342	ifp->if_opackets++;
343	ifp->if_obytes += m->m_pkthdr.len;
344	switch (dst->sa_family) {
345	#if INET
346	case AF_INET:
347	ifq = &ipintrq;
348	isr = NETISR_IP;
349	break;
350	#endif
351	#if INET6
352	case AF_INET6:
353	ifq = &ip6intrq;
354	isr = NETISR_IPV6;
355	break;
356	#endif
357	default:
358	kprintf("faith_pre_output: m=%x family is unknown...(0x%x\n", m, dst->sa_family);
359	m_freem(m);
360	return EAFNOSUPPORT;
361	}
362
363	/* XXX do we need more sanity checks? */
364
365	m->m_pkthdr.rcvif = ifp;
366	s = splimp();
367	if (IF_QFULL(ifq)) {
368	IF_DROP(ifq);
369	m_freem(m);
370	splx(s);
371	return (EJUSTRETURN);
372	}
373	IF_ENQUEUE(ifq, m);
374	schednetisr(isr);
375	ifp->if_ipackets++;
376	ifp->if_ibytes += m->m_pkthdr.len;
377	splx(s);
378	return (EJUSTRETURN);
379	}
380
381	/* ARGSUSED */
382	static void
383	faithrtrequest(cmd, rt, sa)
384	int cmd;
385	struct rtentry *rt;
386	struct sockaddr *sa;
387	{
388	if (rt) {
389	rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; /* for ISO */
390	/*
391	* For optimal performance, the send and receive buffers
392	* should be at least twice the MTU plus a little more for
393	* overhead.
394	*/
395	rt->rt_rmx.rmx_recvpipe =
396	rt->rt_rmx.rmx_sendpipe = 3 * FAITHMTU;
397	}
398	}
399
400	/*
401	* Process an ioctl request.
402	*/
403	/* ARGSUSED */
404	static int
405	faithioctl(ifp, cmd, data)
406	register struct ifnet *ifp;
407	#if defined(__FreeBSD__) && __FreeBSD__ < 3
408	int cmd;
409	#else
410	u_long cmd;
411	#endif
412	caddr_t data;
413	{
414	register struct ifaddr *ifa;
415	register struct ifreq ifr = (struct ifreq )data;
416	register int error = 0;
417
418	switch (cmd) {
419
420	case SIOCSIFADDR:
421	ifp->if_flags \|= IFF_UP \| IFF_RUNNING;
422	ifa = (struct ifaddr *)data;
423	ifa->ifa_rtrequest = faithrtrequest;
424	/*
425	* Everything else is done at a higher level.
426	*/
427	break;
428
429	case SIOCADDMULTI:
430	case SIOCDELMULTI:
431	if (ifr == 0) {
432	error = EAFNOSUPPORT; /* XXX */
433	break;
434	}
435	switch (ifr->ifr_addr.sa_family) {
436	#if INET
437	case AF_INET:
438	break;
439	#endif
440	#if INET6
441	case AF_INET6:
442	break;
443	#endif
444
445	default:
446	error = EAFNOSUPPORT;
447	break;
448	}
449	break;
450
451	#ifdef SIOCSIFMTU
452	#ifndef __OpenBSD__
453	case SIOCSIFMTU:
454	ifp->if_mtu = ifr->ifr_mtu;
455	break;
456	#endif
457	#endif
458
459	case SIOCSIFFLAGS:
460	break;
461
462	default:
463	error = EINVAL;
464	}
465	return (error);
466	}
467	#endif /* NFAITH > 0 */