[deliverable/linux.git] / net / tipc / eth_media.c

/*
 * net/tipc/eth_media.c: Ethernet bearer support for TIPC
 *
 * Copyright (c) 2001-2006, Ericsson AB
 * Copyright (c) 2005-2006, Wind River Systems
 * 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 names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
 */

#include <net/tipc/tipc.h>
#include <net/tipc/tipc_bearer.h>
#include <net/tipc/tipc_msg.h>
#include <linux/netdevice.h>

#define MAX_ETH_BEARERS		2
#define ETH_LINK_PRIORITY	TIPC_DEF_LINK_PRI
#define ETH_LINK_TOLERANCE	TIPC_DEF_LINK_TOL
#define ETH_LINK_WINDOW		TIPC_DEF_LINK_WIN

/**
 * struct eth_bearer - Ethernet bearer data structure
 * @bearer: ptr to associated "generic" bearer structure
 * @dev: ptr to associated Ethernet network device
 * @tipc_packet_type: used in binding TIPC to Ethernet driver
 */

struct eth_bearer {
	struct tipc_bearer *bearer;
	struct net_device *dev;
	struct packet_type tipc_packet_type;
};

static struct eth_bearer eth_bearers[MAX_ETH_BEARERS];
static int eth_started = 0;
static struct notifier_block notifier;

/**
 * send_msg - send a TIPC message out over an Ethernet interface
 */

static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr,
		    struct tipc_media_addr *dest)
{
	struct sk_buff *clone;
	struct net_device *dev;

	clone = skb_clone(buf, GFP_ATOMIC);
	if (clone) {
		clone->nh.raw = clone->data;
		dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
		clone->dev = dev;
		dev->hard_header(clone, dev, ETH_P_TIPC,
				 &dest->dev_addr.eth_addr,
				 dev->dev_addr, clone->len);
		dev_queue_xmit(clone);
	}
	return TIPC_OK;
}

/**
 * recv_msg - handle incoming TIPC message from an Ethernet interface
 *
 * Routine truncates any Ethernet padding/CRC appended to the message,
 * and ensures message size matches actual length
 */

static int recv_msg(struct sk_buff *buf, struct net_device *dev,
		    struct packet_type *pt, struct net_device *orig_dev)
{
	struct eth_bearer *eb_ptr = (struct eth_bearer *)pt->af_packet_priv;
	u32 size;

	if (likely(eb_ptr->bearer)) {
	       if (likely(!dev->promiscuity) ||
		   !memcmp(buf->mac.raw,dev->dev_addr,ETH_ALEN) ||
		   !memcmp(buf->mac.raw,dev->broadcast,ETH_ALEN)) {
			size = msg_size((struct tipc_msg *)buf->data);
			skb_trim(buf, size);
			if (likely(buf->len == size)) {
				buf->next = NULL;
				tipc_recv_msg(buf, eb_ptr->bearer);
				return TIPC_OK;
			}
		}
	}
	kfree_skb(buf);
	return TIPC_OK;
}

/**
 * enable_bearer - attach TIPC bearer to an Ethernet interface
 */

static int enable_bearer(struct tipc_bearer *tb_ptr)
{
	struct net_device *dev = dev_base;
	struct eth_bearer *eb_ptr = &eth_bearers[0];
	struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];
	char *driver_name = strchr((const char *)tb_ptr->name, ':') + 1;

	/* Find device with specified name */

	while (dev && dev->name && strncmp(dev->name, driver_name, IFNAMSIZ)) {
		dev = dev->next;
	}
	if (!dev)
		return -ENODEV;

	/* Find Ethernet bearer for device (or create one) */

	for (;(eb_ptr != stop) && eb_ptr->dev && (eb_ptr->dev != dev); eb_ptr++);
	if (eb_ptr == stop)
		return -EDQUOT;
	if (!eb_ptr->dev) {
		eb_ptr->dev = dev;
		eb_ptr->tipc_packet_type.type = __constant_htons(ETH_P_TIPC);
		eb_ptr->tipc_packet_type.dev = dev;
		eb_ptr->tipc_packet_type.func = recv_msg;
		eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr;
		INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list));
		dev_hold(dev);
		dev_add_pack(&eb_ptr->tipc_packet_type);
	}

	/* Associate TIPC bearer with Ethernet bearer */

	eb_ptr->bearer = tb_ptr;
	tb_ptr->usr_handle = (void *)eb_ptr;
	tb_ptr->mtu = dev->mtu;
	tb_ptr->blocked = 0;
	tb_ptr->addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
	memcpy(&tb_ptr->addr.dev_addr, &dev->dev_addr, ETH_ALEN);
	return 0;
}

/**
 * disable_bearer - detach TIPC bearer from an Ethernet interface
 *
 * We really should do dev_remove_pack() here, but this function can not be
 * called at tasklet level. => Use eth_bearer->bearer as a flag to throw away
 * incoming buffers, & postpone dev_remove_pack() to eth_media_stop() on exit.
 */

static void disable_bearer(struct tipc_bearer *tb_ptr)
{
	((struct eth_bearer *)tb_ptr->usr_handle)->bearer = NULL;
}

/**
 * recv_notification - handle device updates from OS
 *
 * Change the state of the Ethernet bearer (if any) associated with the
 * specified device.
 */

static int recv_notification(struct notifier_block *nb, unsigned long evt,
			     void *dv)
{
	struct net_device *dev = (struct net_device *)dv;
	struct eth_bearer *eb_ptr = &eth_bearers[0];
	struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];

	while ((eb_ptr->dev != dev)) {
		if (++eb_ptr == stop)
			return NOTIFY_DONE;	/* couldn't find device */
	}
	if (!eb_ptr->bearer)
		return NOTIFY_DONE;		/* bearer had been disabled */

	eb_ptr->bearer->mtu = dev->mtu;

	switch (evt) {
	case NETDEV_CHANGE:
		if (netif_carrier_ok(dev))
			tipc_continue(eb_ptr->bearer);
		else
			tipc_block_bearer(eb_ptr->bearer->name);
		break;
	case NETDEV_UP:
		tipc_continue(eb_ptr->bearer);
		break;
	case NETDEV_DOWN:
		tipc_block_bearer(eb_ptr->bearer->name);
		break;
	case NETDEV_CHANGEMTU:
	case NETDEV_CHANGEADDR:
		tipc_block_bearer(eb_ptr->bearer->name);
		tipc_continue(eb_ptr->bearer);
		break;
	case NETDEV_UNREGISTER:
	case NETDEV_CHANGENAME:
		tipc_disable_bearer(eb_ptr->bearer->name);
		break;
	}
	return NOTIFY_OK;
}

/**
 * eth_addr2str - convert Ethernet address to string
 */

static char *eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size)
{
	unchar *addr = (unchar *)&a->dev_addr;

	if (str_size < 18)
		*str_buf = '\0';
	else
		sprintf(str_buf, "%02x:%02x:%02x:%02x:%02x:%02x",
			addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
	return str_buf;
}

/**
 * tipc_eth_media_start - activate Ethernet bearer support
 *
 * Register Ethernet media type with TIPC bearer code.  Also register
 * with OS for notifications about device state changes.
 */

int tipc_eth_media_start(void)
{
	struct tipc_media_addr bcast_addr;
	int res;

	if (eth_started)
		return -EINVAL;

	bcast_addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
	memset(&bcast_addr.dev_addr, 0xff, ETH_ALEN);

	memset(eth_bearers, 0, sizeof(eth_bearers));

	res = tipc_register_media(TIPC_MEDIA_TYPE_ETH, "eth",
				  enable_bearer, disable_bearer, send_msg,
				  eth_addr2str, &bcast_addr, ETH_LINK_PRIORITY,
				  ETH_LINK_TOLERANCE, ETH_LINK_WINDOW);
	if (res)
		return res;

	notifier.notifier_call = &recv_notification;
	notifier.priority = 0;
	res = register_netdevice_notifier(&notifier);
	if (!res)
		eth_started = 1;
	return res;
}

/**
 * tipc_eth_media_stop - deactivate Ethernet bearer support
 */

void tipc_eth_media_stop(void)
{
	int i;

	if (!eth_started)
		return;

	unregister_netdevice_notifier(&notifier);
	for (i = 0; i < MAX_ETH_BEARERS ; i++) {
		if (eth_bearers[i].bearer) {
			eth_bearers[i].bearer->blocked = 1;
			eth_bearers[i].bearer = NULL;
		}
		if (eth_bearers[i].dev) {
			dev_remove_pack(&eth_bearers[i].tipc_packet_type);
			dev_put(eth_bearers[i].dev);
		}
	}
	memset(&eth_bearers, 0, sizeof(eth_bearers));
	eth_started = 0;
}
Commit	Line	Data
b97bf3fd PL	1	/*
b97bf3fd PL	2	* net/tipc/eth_media.c: Ethernet bearer support for TIPC
c4307285	3	*
593a5f22	4	* Copyright (c) 2001-2006, Ericsson AB
687a25f1	5	* Copyright (c) 2005-2006, Wind River Systems
b97bf3fd PL	6	* All rights reserved.
b97bf3fd PL	7	*
9ea1fd3c	8	* Redistribution and use in source and binary forms, with or without
b97bf3fd PL	9	* modification, are permitted provided that the following conditions are met:
b97bf3fd PL	10	*
9ea1fd3c PL	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. Neither the names of the copyright holders nor the names of its
	17	* contributors may be used to endorse or promote products derived from
	18	* this software without specific prior written permission.
b97bf3fd	19	*
9ea1fd3c PL	20	* Alternatively, this software may be distributed under the terms of the
	21	* GNU General Public License ("GPL") version 2 as published by the Free
	22	* Software Foundation.
	23	*
	24	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	25	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	28	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	29	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	30	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	31	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	32	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	33	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
b97bf3fd PL	34	* POSSIBILITY OF SUCH DAMAGE.
	35	*/
	36
	37	#include <net/tipc/tipc.h>
	38	#include <net/tipc/tipc_bearer.h>
	39	#include <net/tipc/tipc_msg.h>
	40	#include <linux/netdevice.h>
b97bf3fd PL	41
b97bf3fd PL	42	#define MAX_ETH_BEARERS 2
16cb4b33	43	#define ETH_LINK_PRIORITY TIPC_DEF_LINK_PRI
b97bf3fd	44	#define ETH_LINK_TOLERANCE TIPC_DEF_LINK_TOL
16cb4b33	45	#define ETH_LINK_WINDOW TIPC_DEF_LINK_WIN
b97bf3fd PL	46
	47	/**
	48	* struct eth_bearer - Ethernet bearer data structure
	49	* @bearer: ptr to associated "generic" bearer structure
	50	* @dev: ptr to associated Ethernet network device
	51	* @tipc_packet_type: used in binding TIPC to Ethernet driver
	52	*/
c4307285	53
b97bf3fd PL	54	struct eth_bearer {
	55	struct tipc_bearer *bearer;
	56	struct net_device *dev;
	57	struct packet_type tipc_packet_type;
	58	};
	59
	60	static struct eth_bearer eth_bearers[MAX_ETH_BEARERS];
	61	static int eth_started = 0;
	62	static struct notifier_block notifier;
	63
	64	/**
c4307285	65	* send_msg - send a TIPC message out over an Ethernet interface
b97bf3fd PL	66	*/
b97bf3fd PL	67
c4307285	68	static int send_msg(struct sk_buff buf, struct tipc_bearer tb_ptr,
b97bf3fd PL	69	struct tipc_media_addr *dest)
	70	{
	71	struct sk_buff *clone;
	72	struct net_device *dev;
	73
	74	clone = skb_clone(buf, GFP_ATOMIC);
	75	if (clone) {
	76	clone->nh.raw = clone->data;
	77	dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
	78	clone->dev = dev;
c4307285	79	dev->hard_header(clone, dev, ETH_P_TIPC,
b97bf3fd PL	80	&dest->dev_addr.eth_addr,
	81	dev->dev_addr, clone->len);
	82	dev_queue_xmit(clone);
	83	}
	84	return TIPC_OK;
	85	}
	86
	87	/**
	88	* recv_msg - handle incoming TIPC message from an Ethernet interface
c4307285	89	*
b97bf3fd PL	90	* Routine truncates any Ethernet padding/CRC appended to the message,
	91	* and ensures message size matches actual length
	92	*/
	93
c4307285	94	static int recv_msg(struct sk_buff buf, struct net_device dev,
b97bf3fd PL	95	struct packet_type pt, struct net_device orig_dev)
	96	{
	97	struct eth_bearer eb_ptr = (struct eth_bearer )pt->af_packet_priv;
	98	u32 size;
	99
	100	if (likely(eb_ptr->bearer)) {
5e3c8854	101	if (likely(!dev->promiscuity) \|\|
c4307285 YH	102	!memcmp(buf->mac.raw,dev->dev_addr,ETH_ALEN) \|\|
	103	!memcmp(buf->mac.raw,dev->broadcast,ETH_ALEN)) {
	104	size = msg_size((struct tipc_msg *)buf->data);
	105	skb_trim(buf, size);
	106	if (likely(buf->len == size)) {
	107	buf->next = NULL;
	108	tipc_recv_msg(buf, eb_ptr->bearer);
	109	return TIPC_OK;
5e3c8854	110	}
b97bf3fd	111	}
b97bf3fd	112	}
5e3c8854	113	kfree_skb(buf);
b97bf3fd PL	114	return TIPC_OK;
	115	}
	116
	117	/**
c4307285	118	* enable_bearer - attach TIPC bearer to an Ethernet interface
b97bf3fd PL	119	*/
	120
	121	static int enable_bearer(struct tipc_bearer *tb_ptr)
	122	{
	123	struct net_device *dev = dev_base;
	124	struct eth_bearer *eb_ptr = &eth_bearers[0];
	125	struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];
	126	char driver_name = strchr((const char )tb_ptr->name, ':') + 1;
	127
	128	/* Find device with specified name */
	129
c4307285	130	while (dev && dev->name && strncmp(dev->name, driver_name, IFNAMSIZ)) {
b97bf3fd PL	131	dev = dev->next;
	132	}
	133	if (!dev)
	134	return -ENODEV;
	135
	136	/* Find Ethernet bearer for device (or create one) */
	137
	138	for (;(eb_ptr != stop) && eb_ptr->dev && (eb_ptr->dev != dev); eb_ptr++);
	139	if (eb_ptr == stop)
	140	return -EDQUOT;
	141	if (!eb_ptr->dev) {
	142	eb_ptr->dev = dev;
33a9c4da	143	eb_ptr->tipc_packet_type.type = __constant_htons(ETH_P_TIPC);
b97bf3fd PL	144	eb_ptr->tipc_packet_type.dev = dev;
	145	eb_ptr->tipc_packet_type.func = recv_msg;
	146	eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr;
	147	INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list));
	148	dev_hold(dev);
	149	dev_add_pack(&eb_ptr->tipc_packet_type);
	150	}
	151
	152	/* Associate TIPC bearer with Ethernet bearer */
	153
	154	eb_ptr->bearer = tb_ptr;
	155	tb_ptr->usr_handle = (void *)eb_ptr;
	156	tb_ptr->mtu = dev->mtu;
c4307285	157	tb_ptr->blocked = 0;
b97bf3fd PL	158	tb_ptr->addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
	159	memcpy(&tb_ptr->addr.dev_addr, &dev->dev_addr, ETH_ALEN);
	160	return 0;
	161	}
	162
	163	/**
c4307285	164	* disable_bearer - detach TIPC bearer from an Ethernet interface
b97bf3fd PL	165	*
	166	* We really should do dev_remove_pack() here, but this function can not be
	167	* called at tasklet level. => Use eth_bearer->bearer as a flag to throw away
	168	* incoming buffers, & postpone dev_remove_pack() to eth_media_stop() on exit.
	169	*/
	170
	171	static void disable_bearer(struct tipc_bearer *tb_ptr)
	172	{
1fc54d8f	173	((struct eth_bearer *)tb_ptr->usr_handle)->bearer = NULL;
b97bf3fd PL	174	}
	175
	176	/**
	177	* recv_notification - handle device updates from OS
	178	*
c4307285	179	* Change the state of the Ethernet bearer (if any) associated with the
b97bf3fd PL	180	* specified device.
	181	*/
	182
c4307285	183	static int recv_notification(struct notifier_block *nb, unsigned long evt,
b97bf3fd PL	184	void *dv)
	185	{
	186	struct net_device dev = (struct net_device )dv;
	187	struct eth_bearer *eb_ptr = &eth_bearers[0];
	188	struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];
	189
	190	while ((eb_ptr->dev != dev)) {
	191	if (++eb_ptr == stop)
	192	return NOTIFY_DONE; /* couldn't find device */
	193	}
	194	if (!eb_ptr->bearer)
	195	return NOTIFY_DONE; /* bearer had been disabled */
	196
c4307285	197	eb_ptr->bearer->mtu = dev->mtu;
b97bf3fd PL	198
	199	switch (evt) {
	200	case NETDEV_CHANGE:
	201	if (netif_carrier_ok(dev))
	202	tipc_continue(eb_ptr->bearer);
	203	else
	204	tipc_block_bearer(eb_ptr->bearer->name);
	205	break;
	206	case NETDEV_UP:
	207	tipc_continue(eb_ptr->bearer);
	208	break;
	209	case NETDEV_DOWN:
	210	tipc_block_bearer(eb_ptr->bearer->name);
	211	break;
	212	case NETDEV_CHANGEMTU:
c4307285	213	case NETDEV_CHANGEADDR:
b97bf3fd	214	tipc_block_bearer(eb_ptr->bearer->name);
c4307285	215	tipc_continue(eb_ptr->bearer);
b97bf3fd PL	216	break;
b97bf3fd PL	217	case NETDEV_UNREGISTER:
c4307285	218	case NETDEV_CHANGENAME:
b97bf3fd PL	219	tipc_disable_bearer(eb_ptr->bearer->name);
	220	break;
	221	}
	222	return NOTIFY_OK;
	223	}
	224
	225	/**
	226	* eth_addr2str - convert Ethernet address to string
	227	*/
	228
	229	static char eth_addr2str(struct tipc_media_addr a, char *str_buf, int str_size)
c4307285	230	{
b97bf3fd PL	231	unchar addr = (unchar )&a->dev_addr;
	232
	233	if (str_size < 18)
	234	*str_buf = '\0';
	235	else
	236	sprintf(str_buf, "%02x:%02x:%02x:%02x:%02x:%02x",
	237	addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
	238	return str_buf;
	239	}
	240
	241	/**
4323add6	242	* tipc_eth_media_start - activate Ethernet bearer support
b97bf3fd PL	243	*
	244	* Register Ethernet media type with TIPC bearer code. Also register
	245	* with OS for notifications about device state changes.
	246	*/
	247
4323add6	248	int tipc_eth_media_start(void)
c4307285	249	{
b97bf3fd PL	250	struct tipc_media_addr bcast_addr;
	251	int res;
	252
	253	if (eth_started)
	254	return -EINVAL;
	255
49384507 AS	256	bcast_addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
	257	memset(&bcast_addr.dev_addr, 0xff, ETH_ALEN);
	258
b97bf3fd PL	259	memset(eth_bearers, 0, sizeof(eth_bearers));
	260
	261	res = tipc_register_media(TIPC_MEDIA_TYPE_ETH, "eth",
c4307285 YH	262	enable_bearer, disable_bearer, send_msg,
c4307285 YH	263	eth_addr2str, &bcast_addr, ETH_LINK_PRIORITY,
16cb4b33	264	ETH_LINK_TOLERANCE, ETH_LINK_WINDOW);
b97bf3fd PL	265	if (res)
	266	return res;
	267
	268	notifier.notifier_call = &recv_notification;
	269	notifier.priority = 0;
	270	res = register_netdevice_notifier(&notifier);
	271	if (!res)
	272	eth_started = 1;
	273	return res;
	274	}
	275
	276	/**
4323add6	277	* tipc_eth_media_stop - deactivate Ethernet bearer support
b97bf3fd PL	278	*/
b97bf3fd PL	279
4323add6	280	void tipc_eth_media_stop(void)
b97bf3fd PL	281	{
	282	int i;
	283
	284	if (!eth_started)
	285	return;
	286
	287	unregister_netdevice_notifier(&notifier);
	288	for (i = 0; i < MAX_ETH_BEARERS ; i++) {
	289	if (eth_bearers[i].bearer) {
	290	eth_bearers[i].bearer->blocked = 1;
1fc54d8f	291	eth_bearers[i].bearer = NULL;
b97bf3fd PL	292	}
	293	if (eth_bearers[i].dev) {
	294	dev_remove_pack(&eth_bearers[i].tipc_packet_type);
	295	dev_put(eth_bearers[i].dev);
	296	}
	297	}
	298	memset(&eth_bearers, 0, sizeof(eth_bearers));
	299	eth_started = 0;
	300	}