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

/*
 * Copyright (c) 2000 Apple Computer, 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@
 */
/*
 * 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(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. */
		u_int af = dst->sa_family;

		bpf_tap_out(ifp, 0, m, &af, sizeof(af));
	}
	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:
		ifnet_set_flags(ifp, IFF_UP, 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	1	/*
5d5c5d0d A	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
5d5c5d0d A	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
2d21ac55 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.
8f6c56a5	14	*
2d21ac55 A	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	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
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	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.
8f6c56a5	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/*
	29	* Copyright (c) 1982, 1986, 1993
	30	* The Regents of the University of California. All rights reserved.
	31	*
	32	* Redistribution and use in source and binary forms, with or without
	33	* modification, are permitted provided that the following conditions
	34	* are met:
	35	* 1. Redistributions of source code must retain the above copyright
	36	* notice, this list of conditions and the following disclaimer.
	37	* 2. Redistributions in binary form must reproduce the above copyright
	38	* notice, this list of conditions and the following disclaimer in the
	39	* documentation and/or other materials provided with the distribution.
	40	* 3. All advertising materials mentioning features or use of this software
	41	* must display the following acknowledgement:
	42	* This product includes software developed by the University of
	43	* California, Berkeley and its contributors.
	44	* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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	* From: @(#)if_loop.c 8.1 (Berkeley) 6/10/93
9bccf70c	61	* $FreeBSD: src/sys/net/if_disc.c,v 1.26.2.1 2001/03/06 00:32:09 obrien Exp $
1c79356b A	62	*/
	63
	64	/*
	65	* Discard interface driver for protocol testing and timing.
	66	* (Based on the loopback.)
	67	*/
	68
	69	#include <sys/param.h>
	70	#include <sys/systm.h>
	71	#include <sys/kernel.h>
	72	#include <sys/mbuf.h>
	73	#include <sys/socket.h>
	74	#include <sys/sockio.h>
	75
	76	#include <net/if.h>
	77	#include <net/if_types.h>
	78	#include <net/route.h>
	79	#include <net/bpf.h>
	80
9bccf70c	81	#ifdef TINY_DSMTU
1c79356b A	82	#define DSMTU (1024+512)
	83	#else
	84	#define DSMTU 65532
	85	#endif
	86
91447636	87	static void discattach(void);
1c79356b A	88
	89	static struct ifnet discif;
	90	static int discoutput(struct ifnet , struct mbuf , struct sockaddr *,
	91	struct rtentry *);
	92	static void discrtrequest(int cmd, struct rtentry rt, struct sockaddr sa);
	93	static int discioctl(struct ifnet *, u_long, caddr_t);
	94
	95	/* ARGSUSED */
	96	static void
9bccf70c	97	discattach()
1c79356b A	98	{
	99	register struct ifnet *ifp = &discif;
	100
	101	ifp->if_name = "ds";
	102	ifp->if_family = APPLE_IF_FAM_DISC;
	103	ifp->if_mtu = DSMTU;
	104	ifp->if_flags = IFF_LOOPBACK \| IFF_MULTICAST;
	105	ifp->if_ioctl = discioctl;
	106	ifp->if_output = discoutput;
	107	ifp->if_type = IFT_LOOP;
	108	ifp->if_hdrlen = 0;
	109	ifp->if_addrlen = 0;
	110	if_attach(ifp);
1c79356b	111	bpfattach(ifp, DLT_NULL, sizeof(u_int));
1c79356b A	112	}
1c79356b A	113
9bccf70c A	114	#ifndef __APPLE__
	115	static int
	116	disc_modevent(module_t mod, int type, void *data)
	117	{
	118	switch (type) {
	119	case MOD_LOAD:
	120	discattach();
	121	break;
	122	case MOD_UNLOAD:
	123	printf("if_disc module unload - not possible for this module type\n");
	124	return EINVAL;
	125	}
	126	return 0;
	127	}
	128
	129	static moduledata_t disc_mod = {
	130	"if_disc",
	131	disc_modevent,
	132	NULL
	133	};
	134
	135	DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
	136	#endif
	137
1c79356b A	138	static int
	139	discoutput(ifp, m, dst, rt)
	140	struct ifnet *ifp;
	141	register struct mbuf *m;
	142	struct sockaddr *dst;
	143	register struct rtentry *rt;
	144	{
	145	if ((m->m_flags & M_PKTHDR) == 0)
	146	panic("discoutput no HDR");
1c79356b A	147	/* BPF write needs to be handled specially */
	148	if (dst->sa_family == AF_UNSPEC) {
	149	dst->sa_family = (mtod(m, int ));
	150	m->m_len -= sizeof(int);
	151	m->m_pkthdr.len -= sizeof(int);
	152	m->m_data += sizeof(int);
	153	}
	154
	155	if (discif.if_bpf) {
2d21ac55	156	/* We need to prepend the address family as a four byte field. */
1c79356b A	157	u_int af = dst->sa_family;
1c79356b A	158
2d21ac55	159	bpf_tap_out(ifp, 0, m, &af, sizeof(af));
1c79356b	160	}
1c79356b A	161	m->m_pkthdr.rcvif = ifp;
	162
	163	ifp->if_opackets++;
	164	ifp->if_obytes += m->m_pkthdr.len;
	165
	166	m_freem(m);
	167	return 0;
	168	}
	169
	170	/* ARGSUSED */
	171	static void
	172	discrtrequest(cmd, rt, sa)
	173	int cmd;
	174	struct rtentry *rt;
	175	struct sockaddr *sa;
	176	{
	177	if (rt)
	178	rt->rt_rmx.rmx_mtu = DSMTU;
	179	}
	180
	181	/*
	182	* Process an ioctl request.
	183	*/
	184	/* ARGSUSED */
	185	static int
	186	discioctl(ifp, cmd, data)
	187	register struct ifnet *ifp;
	188	u_long cmd;
	189	caddr_t data;
	190	{
	191	register struct ifaddr *ifa;
	192	register struct ifreq ifr = (struct ifreq )data;
	193	register int error = 0;
	194
	195	switch (cmd) {
	196
	197	case SIOCSIFADDR:
91447636	198	ifnet_set_flags(ifp, IFF_UP, IFF_UP);
1c79356b A	199	ifa = (struct ifaddr *)data;
	200	if (ifa != 0)
	201	ifa->ifa_rtrequest = discrtrequest;
	202	/*
	203	* Everything else is done at a higher level.
	204	*/
	205	break;
	206
	207	case SIOCADDMULTI:
	208	case SIOCDELMULTI:
	209	if (ifr == 0) {
	210	error = EAFNOSUPPORT; /* XXX */
	211	break;
	212	}
	213	switch (ifr->ifr_addr.sa_family) {
	214
	215	#if INET
	216	case AF_INET:
	217	break;
	218	#endif
9bccf70c A	219	#if INET6
	220	case AF_INET6:
	221	break;
	222	#endif
1c79356b A	223
	224	default:
	225	error = EAFNOSUPPORT;
	226	break;
	227	}
	228	break;
	229
	230	case SIOCSIFMTU:
	231	ifp->if_mtu = ifr->ifr_mtu;
	232	break;
	233
	234	default:
	235	error = EINVAL;
	236	}
	237	return (error);
	238	}