[apple/xnu.git] / bsd / net / if_disc.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * 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. 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_LICENSE_HEADER_END@
 */
/*
 * 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.
 *
 *	From: @(#)if_loop.c	8.1 (Berkeley) 6/10/93
 * $FreeBSD: src/sys/net/if_disc.c,v 1.26.2.1 2001/03/06 00:32:09 obrien Exp $
 */

/*
 * Discard interface driver for protocol testing and timing.
 * (Based on the loopback.)
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>

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

#ifdef TINY_DSMTU
#define	DSMTU	(1024+512)
#else
#define DSMTU	65532
#endif

static void discattach __P((void));

static struct	ifnet discif;
static int discoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
		    struct rtentry *);
static void discrtrequest(int cmd, struct rtentry *rt, struct sockaddr *sa);
static int discioctl(struct ifnet *, u_long, caddr_t);

/* ARGSUSED */
static void
discattach()
{
	register struct ifnet *ifp = &discif;

	ifp->if_name = "ds";
	ifp->if_family = APPLE_IF_FAM_DISC;
	ifp->if_mtu = DSMTU;
	ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
	ifp->if_ioctl = discioctl;
	ifp->if_output = discoutput;
	ifp->if_type = IFT_LOOP;
	ifp->if_hdrlen = 0;
	ifp->if_addrlen = 0;
	if_attach(ifp);
	bpfattach(ifp, DLT_NULL, sizeof(u_int));
}

#ifndef __APPLE__
static int
disc_modevent(module_t mod, int type, void *data) 
{ 
	switch (type) { 
	case MOD_LOAD: 
		discattach();
		break; 
	case MOD_UNLOAD: 
		printf("if_disc module unload - not possible for this module type\n"); 
		return EINVAL; 
	} 
	return 0; 
} 

static moduledata_t disc_mod = { 
	"if_disc", 
	disc_modevent, 
	NULL
}; 

DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
#endif

static int
discoutput(ifp, m, dst, rt)
	struct ifnet *ifp;
	register struct mbuf *m;
	struct sockaddr *dst;
	register struct rtentry *rt;
{
	if ((m->m_flags & M_PKTHDR) == 0)
		panic("discoutput no HDR");
	/* BPF write needs to be handled specially */
	if (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 (discif.if_bpf) {
		/*
		 * We need to prepend the address family as
		 * a four byte field.  Cons up a dummy 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;

		bpf_mtap(&discif, &m0);
	}
	m->m_pkthdr.rcvif = ifp;

	ifp->if_opackets++;
	ifp->if_obytes += m->m_pkthdr.len;

	m_freem(m);
	return 0;
}

/* ARGSUSED */
static void
discrtrequest(cmd, rt, sa)
	int cmd;
	struct rtentry *rt;
	struct sockaddr *sa;
{
	if (rt)
		rt->rt_rmx.rmx_mtu = DSMTU;
}

/*
 * Process an ioctl request.
 */
/* ARGSUSED */
static int
discioctl(ifp, cmd, data)
	register struct ifnet *ifp;
	u_long cmd;
	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;
		ifa = (struct ifaddr *)data;
		if (ifa != 0)
			ifa->ifa_rtrequest = discrtrequest;
		/*
		 * 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;

	case SIOCSIFMTU:
		ifp->if_mtu = ifr->ifr_mtu;
		break;

	default:
		error = EINVAL;
	}
	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	*
43866e37	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
43866e37 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
43866e37 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/*
	26	* Copyright (c) 1982, 1986, 1993
	27	* The Regents of the University of California. All rights reserved.
	28	*
	29	* Redistribution and use in source and binary forms, with or without
	30	* modification, are permitted provided that the following conditions
	31	* are met:
	32	* 1. Redistributions of source code must retain the above copyright
	33	* notice, this list of conditions and the following disclaimer.
	34	* 2. Redistributions in binary form must reproduce the above copyright
	35	* notice, this list of conditions and the following disclaimer in the
	36	* documentation and/or other materials provided with the distribution.
	37	* 3. All advertising materials mentioning features or use of this software
	38	* must display the following acknowledgement:
	39	* This product includes software developed by the University of
	40	* California, Berkeley and its contributors.
	41	* 4. Neither the name of the University nor the names of its contributors
	42	* may be used to endorse or promote products derived from this software
	43	* without specific prior written permission.
	44	*
	45	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	46	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	47	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	48	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	49	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	50	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	51	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	52	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	53	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	54	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	55	* SUCH DAMAGE.
	56	*
	57	* From: @(#)if_loop.c 8.1 (Berkeley) 6/10/93
9bccf70c	58	* $FreeBSD: src/sys/net/if_disc.c,v 1.26.2.1 2001/03/06 00:32:09 obrien Exp $
1c79356b A	59	*/
	60
	61	/*
	62	* Discard interface driver for protocol testing and timing.
	63	* (Based on the loopback.)
	64	*/
	65
	66	#include <sys/param.h>
	67	#include <sys/systm.h>
	68	#include <sys/kernel.h>
	69	#include <sys/mbuf.h>
	70	#include <sys/socket.h>
	71	#include <sys/sockio.h>
	72
	73	#include <net/if.h>
	74	#include <net/if_types.h>
	75	#include <net/route.h>
	76	#include <net/bpf.h>
	77
9bccf70c	78	#ifdef TINY_DSMTU
1c79356b A	79	#define DSMTU (1024+512)
	80	#else
	81	#define DSMTU 65532
	82	#endif
	83
9bccf70c	84	static void discattach __P((void));
1c79356b A	85
	86	static struct ifnet discif;
	87	static int discoutput(struct ifnet , struct mbuf , struct sockaddr *,
	88	struct rtentry *);
	89	static void discrtrequest(int cmd, struct rtentry rt, struct sockaddr sa);
	90	static int discioctl(struct ifnet *, u_long, caddr_t);
	91
	92	/* ARGSUSED */
	93	static void
9bccf70c	94	discattach()
1c79356b A	95	{
	96	register struct ifnet *ifp = &discif;
	97
	98	ifp->if_name = "ds";
	99	ifp->if_family = APPLE_IF_FAM_DISC;
	100	ifp->if_mtu = DSMTU;
	101	ifp->if_flags = IFF_LOOPBACK \| IFF_MULTICAST;
	102	ifp->if_ioctl = discioctl;
	103	ifp->if_output = discoutput;
	104	ifp->if_type = IFT_LOOP;
	105	ifp->if_hdrlen = 0;
	106	ifp->if_addrlen = 0;
	107	if_attach(ifp);
1c79356b	108	bpfattach(ifp, DLT_NULL, sizeof(u_int));
1c79356b A	109	}
1c79356b A	110
9bccf70c A	111	#ifndef __APPLE__
	112	static int
	113	disc_modevent(module_t mod, int type, void *data)
	114	{
	115	switch (type) {
	116	case MOD_LOAD:
	117	discattach();
	118	break;
	119	case MOD_UNLOAD:
	120	printf("if_disc module unload - not possible for this module type\n");
	121	return EINVAL;
	122	}
	123	return 0;
	124	}
	125
	126	static moduledata_t disc_mod = {
	127	"if_disc",
	128	disc_modevent,
	129	NULL
	130	};
	131
	132	DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
	133	#endif
	134
1c79356b A	135	static int
	136	discoutput(ifp, m, dst, rt)
	137	struct ifnet *ifp;
	138	register struct mbuf *m;
	139	struct sockaddr *dst;
	140	register struct rtentry *rt;
	141	{
	142	if ((m->m_flags & M_PKTHDR) == 0)
	143	panic("discoutput no HDR");
1c79356b A	144	/* BPF write needs to be handled specially */
	145	if (dst->sa_family == AF_UNSPEC) {
	146	dst->sa_family = (mtod(m, int ));
	147	m->m_len -= sizeof(int);
	148	m->m_pkthdr.len -= sizeof(int);
	149	m->m_data += sizeof(int);
	150	}
	151
	152	if (discif.if_bpf) {
	153	/*
	154	* We need to prepend the address family as
	155	* a four byte field. Cons up a dummy header
	156	* to pacify bpf. This is safe because bpf
	157	* will only read from the mbuf (i.e., it won't
	158	* try to free it or keep a pointer a to it).
	159	*/
	160	struct mbuf m0;
	161	u_int af = dst->sa_family;
	162
	163	m0.m_next = m;
	164	m0.m_len = 4;
	165	m0.m_data = (char *)⁡
	166
	167	bpf_mtap(&discif, &m0);
	168	}
1c79356b A	169	m->m_pkthdr.rcvif = ifp;
	170
	171	ifp->if_opackets++;
	172	ifp->if_obytes += m->m_pkthdr.len;
	173
	174	m_freem(m);
	175	return 0;
	176	}
	177
	178	/* ARGSUSED */
	179	static void
	180	discrtrequest(cmd, rt, sa)
	181	int cmd;
	182	struct rtentry *rt;
	183	struct sockaddr *sa;
	184	{
	185	if (rt)
	186	rt->rt_rmx.rmx_mtu = DSMTU;
	187	}
	188
	189	/*
	190	* Process an ioctl request.
	191	*/
	192	/* ARGSUSED */
	193	static int
	194	discioctl(ifp, cmd, data)
	195	register struct ifnet *ifp;
	196	u_long cmd;
	197	caddr_t data;
	198	{
	199	register struct ifaddr *ifa;
	200	register struct ifreq ifr = (struct ifreq )data;
	201	register int error = 0;
	202
	203	switch (cmd) {
	204
	205	case SIOCSIFADDR:
	206	ifp->if_flags \|= IFF_UP;
	207	ifa = (struct ifaddr *)data;
	208	if (ifa != 0)
	209	ifa->ifa_rtrequest = discrtrequest;
	210	/*
	211	* Everything else is done at a higher level.
	212	*/
	213	break;
	214
	215	case SIOCADDMULTI:
	216	case SIOCDELMULTI:
	217	if (ifr == 0) {
	218	error = EAFNOSUPPORT; /* XXX */
	219	break;
	220	}
	221	switch (ifr->ifr_addr.sa_family) {
	222
	223	#if INET
	224	case AF_INET:
	225	break;
	226	#endif
9bccf70c A	227	#if INET6
	228	case AF_INET6:
	229	break;
	230	#endif
1c79356b A	231
	232	default:
	233	error = EAFNOSUPPORT;
	234	break;
	235	}
	236	break;
	237
	238	case SIOCSIFMTU:
	239	ifp->if_mtu = ifr->ifr_mtu;
	240	break;
	241
	242	default:
	243	error = EINVAL;
	244	}
	245	return (error);
	246	}