[apple/xnu.git] / bsd / net / if_disc.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@
 */
/*
 * 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	*
de355530 A	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.
1c79356b	11	*
de355530 A	12	* This Original Code and all software distributed under the License are
de355530 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
de355530 A	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.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* Copyright (c) 1982, 1986, 1993
	24	* The Regents of the University of California. All rights reserved.
	25	*
	26	* Redistribution and use in source and binary forms, with or without
	27	* modification, are permitted provided that the following conditions
	28	* are met:
	29	* 1. Redistributions of source code must retain the above copyright
	30	* notice, this list of conditions and the following disclaimer.
	31	* 2. Redistributions in binary form must reproduce the above copyright
	32	* notice, this list of conditions and the following disclaimer in the
	33	* documentation and/or other materials provided with the distribution.
	34	* 3. All advertising materials mentioning features or use of this software
	35	* must display the following acknowledgement:
	36	* This product includes software developed by the University of
	37	* California, Berkeley and its contributors.
	38	* 4. Neither the name of the University nor the names of its contributors
	39	* may be used to endorse or promote products derived from this software
	40	* without specific prior written permission.
	41	*
	42	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	43	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	44	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	45	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	46	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	47	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	48	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	49	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	50	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	51	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	52	* SUCH DAMAGE.
	53	*
	54	* From: @(#)if_loop.c 8.1 (Berkeley) 6/10/93
9bccf70c	55	* $FreeBSD: src/sys/net/if_disc.c,v 1.26.2.1 2001/03/06 00:32:09 obrien Exp $
1c79356b A	56	*/
	57
	58	/*
	59	* Discard interface driver for protocol testing and timing.
	60	* (Based on the loopback.)
	61	*/
	62
	63	#include <sys/param.h>
	64	#include <sys/systm.h>
	65	#include <sys/kernel.h>
	66	#include <sys/mbuf.h>
	67	#include <sys/socket.h>
	68	#include <sys/sockio.h>
	69
	70	#include <net/if.h>
	71	#include <net/if_types.h>
	72	#include <net/route.h>
	73	#include <net/bpf.h>
	74
9bccf70c	75	#ifdef TINY_DSMTU
1c79356b A	76	#define DSMTU (1024+512)
	77	#else
	78	#define DSMTU 65532
	79	#endif
	80
9bccf70c	81	static void discattach __P((void));
1c79356b A	82
	83	static struct ifnet discif;
	84	static int discoutput(struct ifnet , struct mbuf , struct sockaddr *,
	85	struct rtentry *);
	86	static void discrtrequest(int cmd, struct rtentry rt, struct sockaddr sa);
	87	static int discioctl(struct ifnet *, u_long, caddr_t);
	88
	89	/* ARGSUSED */
	90	static void
9bccf70c	91	discattach()
1c79356b A	92	{
	93	register struct ifnet *ifp = &discif;
	94
	95	ifp->if_name = "ds";
	96	ifp->if_family = APPLE_IF_FAM_DISC;
	97	ifp->if_mtu = DSMTU;
	98	ifp->if_flags = IFF_LOOPBACK \| IFF_MULTICAST;
	99	ifp->if_ioctl = discioctl;
	100	ifp->if_output = discoutput;
	101	ifp->if_type = IFT_LOOP;
	102	ifp->if_hdrlen = 0;
	103	ifp->if_addrlen = 0;
	104	if_attach(ifp);
1c79356b	105	bpfattach(ifp, DLT_NULL, sizeof(u_int));
1c79356b A	106	}
1c79356b A	107
9bccf70c A	108	#ifndef __APPLE__
	109	static int
	110	disc_modevent(module_t mod, int type, void *data)
	111	{
	112	switch (type) {
	113	case MOD_LOAD:
	114	discattach();
	115	break;
	116	case MOD_UNLOAD:
	117	printf("if_disc module unload - not possible for this module type\n");
	118	return EINVAL;
	119	}
	120	return 0;
	121	}
	122
	123	static moduledata_t disc_mod = {
	124	"if_disc",
	125	disc_modevent,
	126	NULL
	127	};
	128
	129	DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
	130	#endif
	131
1c79356b A	132	static int
	133	discoutput(ifp, m, dst, rt)
	134	struct ifnet *ifp;
	135	register struct mbuf *m;
	136	struct sockaddr *dst;
	137	register struct rtentry *rt;
	138	{
	139	if ((m->m_flags & M_PKTHDR) == 0)
	140	panic("discoutput no HDR");
1c79356b A	141	/* BPF write needs to be handled specially */
	142	if (dst->sa_family == AF_UNSPEC) {
	143	dst->sa_family = (mtod(m, int ));
	144	m->m_len -= sizeof(int);
	145	m->m_pkthdr.len -= sizeof(int);
	146	m->m_data += sizeof(int);
	147	}
	148
	149	if (discif.if_bpf) {
	150	/*
	151	* We need to prepend the address family as
	152	* a four byte field. Cons up a dummy header
	153	* to pacify bpf. This is safe because bpf
	154	* will only read from the mbuf (i.e., it won't
	155	* try to free it or keep a pointer a to it).
	156	*/
	157	struct mbuf m0;
	158	u_int af = dst->sa_family;
	159
	160	m0.m_next = m;
	161	m0.m_len = 4;
	162	m0.m_data = (char *)⁡
	163
	164	bpf_mtap(&discif, &m0);
	165	}
1c79356b A	166	m->m_pkthdr.rcvif = ifp;
	167
	168	ifp->if_opackets++;
	169	ifp->if_obytes += m->m_pkthdr.len;
	170
	171	m_freem(m);
	172	return 0;
	173	}
	174
	175	/* ARGSUSED */
	176	static void
	177	discrtrequest(cmd, rt, sa)
	178	int cmd;
	179	struct rtentry *rt;
	180	struct sockaddr *sa;
	181	{
	182	if (rt)
	183	rt->rt_rmx.rmx_mtu = DSMTU;
	184	}
	185
	186	/*
	187	* Process an ioctl request.
	188	*/
	189	/* ARGSUSED */
	190	static int
	191	discioctl(ifp, cmd, data)
	192	register struct ifnet *ifp;
	193	u_long cmd;
	194	caddr_t data;
	195	{
	196	register struct ifaddr *ifa;
	197	register struct ifreq ifr = (struct ifreq )data;
	198	register int error = 0;
	199
	200	switch (cmd) {
	201
	202	case SIOCSIFADDR:
	203	ifp->if_flags \|= IFF_UP;
	204	ifa = (struct ifaddr *)data;
	205	if (ifa != 0)
	206	ifa->ifa_rtrequest = discrtrequest;
	207	/*
	208	* Everything else is done at a higher level.
	209	*/
	210	break;
	211
	212	case SIOCADDMULTI:
	213	case SIOCDELMULTI:
	214	if (ifr == 0) {
	215	error = EAFNOSUPPORT; /* XXX */
	216	break;
	217	}
	218	switch (ifr->ifr_addr.sa_family) {
	219
	220	#if INET
	221	case AF_INET:
	222	break;
	223	#endif
9bccf70c A	224	#if INET6
	225	case AF_INET6:
	226	break;
	227	#endif
1c79356b A	228
	229	default:
	230	error = EAFNOSUPPORT;
	231	break;
	232	}
	233	break;
	234
	235	case SIOCSIFMTU:
	236	ifp->if_mtu = ifr->ifr_mtu;
	237	break;
	238
	239	default:
	240	error = EINVAL;
	241	}
	242	return (error);
	243	}