[linux-block.git] / net / tipc / eth_media.c

/*
 * net/tipc/eth_media.c: Ethernet bearer support for TIPC
 *
 * Copyright (c) 2001-2007, Ericsson AB
 * Copyright (c) 2005-2008, 2011, 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 "core.h"
#include "bearer.h"

#define MAX_ETH_BEARERS		MAX_BEARERS

/**
 * 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;
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;
	int delta;

	clone = skb_clone(buf, GFP_ATOMIC);
	if (!clone)
		return 0;

	dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
	delta = dev->hard_header_len - skb_headroom(buf);

	if ((delta > 0) &&
	    pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
		kfree_skb(clone);
		return 0;
	}

	skb_reset_network_header(clone);
	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 0;
}

/**
 * recv_msg - handle incoming TIPC message from an Ethernet interface
 *
 * Accept only packets explicitly sent to this node, or broadcast packets;
 * ignores packets sent using Ethernet multicast, and traffic sent to other
 * nodes (which can happen if interface is running in promiscuous mode).
 */

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;

	if (!net_eq(dev_net(dev), &init_net)) {
		kfree_skb(buf);
		return 0;
	}

	if (likely(eb_ptr->bearer)) {
		if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
			buf->next = NULL;
			tipc_recv_msg(buf, eb_ptr->bearer);
			return 0;
		}
	}
	kfree_skb(buf);
	return 0;
}

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

static int enable_bearer(struct tipc_bearer *tb_ptr)
{
	struct net_device *dev = NULL;
	struct net_device *pdev = NULL;
	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;
	int pending_dev = 0;

	/* Find unused Ethernet bearer structure */

	while (eb_ptr->dev) {
		if (!eb_ptr->bearer)
			pending_dev++;
		if (++eb_ptr == stop)
			return pending_dev ? -EAGAIN : -EDQUOT;
	}

	/* Find device with specified name */

	read_lock(&dev_base_lock);
	for_each_netdev(&init_net, pdev) {
		if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) {
			dev = pdev;
			dev_hold(dev);
			break;
		}
	}
	read_unlock(&dev_base_lock);
	if (!dev)
		return -ENODEV;

	/* Create Ethernet bearer for device */

	eb_ptr->dev = dev;
	eb_ptr->tipc_packet_type.type = 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_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];

	if (!net_eq(dev_net(dev), &init_net))
		return NOTIFY_DONE;

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

	if (str_size < 18)	/* 18 = strlen("aa:bb:cc:dd:ee:ff\0") */
		return 1;

	sprintf(str_buf, "%pM", addr);
	return 0;
}

/*
 * Ethernet media registration info
 */

static struct media eth_media_info = {
	.send_msg	= send_msg,
	.enable_bearer	= enable_bearer,
	.disable_bearer	= disable_bearer,
	.addr2str	= eth_addr2str,
	.bcast_addr	= { htonl(TIPC_MEDIA_TYPE_ETH),
			    { {0xff, 0xff, 0xff, 0xff, 0xff, 0xff} } },
	.priority	= TIPC_DEF_LINK_PRI,
	.tolerance	= TIPC_DEF_LINK_TOL,
	.window		= TIPC_DEF_LINK_WIN,
	.type_id	= TIPC_MEDIA_TYPE_ETH,
	.name		= "eth"
};

/**
 * 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)
{
	int res;

	if (eth_started)
		return -EINVAL;

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

	res = tipc_register_media(&eth_media_info);
	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	*
f3ec75f6	4	* Copyright (c) 2001-2007, Ericsson AB
bcd326e8	5	* Copyright (c) 2005-2008, 2011, 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
d265fef6 AS	37	#include "core.h"
	38	#include "bearer.h"
	39
909234cd	40	#define MAX_ETH_BEARERS MAX_BEARERS
b97bf3fd PL	41
	42	/**
	43	* struct eth_bearer - Ethernet bearer data structure
	44	* @bearer: ptr to associated "generic" bearer structure
	45	* @dev: ptr to associated Ethernet network device
	46	* @tipc_packet_type: used in binding TIPC to Ethernet driver
	47	*/
c4307285	48
b97bf3fd PL	49	struct eth_bearer {
	50	struct tipc_bearer *bearer;
	51	struct net_device *dev;
	52	struct packet_type tipc_packet_type;
	53	};
	54
	55	static struct eth_bearer eth_bearers[MAX_ETH_BEARERS];
e3ec9c7d	56	static int eth_started;
b97bf3fd PL	57	static struct notifier_block notifier;
	58
	59	/**
c4307285	60	* send_msg - send a TIPC message out over an Ethernet interface
b97bf3fd PL	61	*/
b97bf3fd PL	62
c4307285	63	static int send_msg(struct sk_buff buf, struct tipc_bearer tb_ptr,
b97bf3fd PL	64	struct tipc_media_addr *dest)
	65	{
	66	struct sk_buff *clone;
	67	struct net_device *dev;
9fbfca01	68	int delta;
b97bf3fd PL	69
b97bf3fd PL	70	clone = skb_clone(buf, GFP_ATOMIC);
9fbfca01 AS	71	if (!clone)
	72	return 0;
	73
	74	dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
	75	delta = dev->hard_header_len - skb_headroom(buf);
	76
	77	if ((delta > 0) &&
	78	pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
	79	kfree_skb(clone);
	80	return 0;
b97bf3fd	81	}
9fbfca01 AS	82
	83	skb_reset_network_header(clone);
	84	clone->dev = dev;
	85	dev_hard_header(clone, dev, ETH_P_TIPC, &dest->dev_addr.eth_addr,
	86	dev->dev_addr, clone->len);
	87	dev_queue_xmit(clone);
0e35fd5e	88	return 0;
b97bf3fd PL	89	}
	90
	91	/**
	92	* recv_msg - handle incoming TIPC message from an Ethernet interface
c4307285	93	*
f3ec75f6 AS	94	* Accept only packets explicitly sent to this node, or broadcast packets;
	95	* ignores packets sent using Ethernet multicast, and traffic sent to other
	96	* nodes (which can happen if interface is running in promiscuous mode).
b97bf3fd PL	97	*/
b97bf3fd PL	98
c4307285	99	static int recv_msg(struct sk_buff buf, struct net_device dev,
b97bf3fd PL	100	struct packet_type pt, struct net_device orig_dev)
	101	{
	102	struct eth_bearer eb_ptr = (struct eth_bearer )pt->af_packet_priv;
b97bf3fd	103
721499e8	104	if (!net_eq(dev_net(dev), &init_net)) {
e730c155 EB	105	kfree_skb(buf);
	106	return 0;
	107	}
	108
b97bf3fd	109	if (likely(eb_ptr->bearer)) {
f3ec75f6	110	if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
b2abd4c0 PG	111	buf->next = NULL;
	112	tipc_recv_msg(buf, eb_ptr->bearer);
	113	return 0;
b97bf3fd	114	}
b97bf3fd	115	}
5e3c8854	116	kfree_skb(buf);
0e35fd5e	117	return 0;
b97bf3fd PL	118	}
	119
	120	/**
c4307285	121	* enable_bearer - attach TIPC bearer to an Ethernet interface
b97bf3fd PL	122	*/
	123
	124	static int enable_bearer(struct tipc_bearer *tb_ptr)
	125	{
cb283ead JPM	126	struct net_device *dev = NULL;
cb283ead JPM	127	struct net_device *pdev = NULL;
b97bf3fd PL	128	struct eth_bearer *eb_ptr = &eth_bearers[0];
	129	struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];
	130	char driver_name = strchr((const char )tb_ptr->name, ':') + 1;
d1fb6279 AS	131	int pending_dev = 0;
	132
	133	/* Find unused Ethernet bearer structure */
	134
	135	while (eb_ptr->dev) {
	136	if (!eb_ptr->bearer)
	137	pending_dev++;
	138	if (++eb_ptr == stop)
	139	return pending_dev ? -EAGAIN : -EDQUOT;
	140	}
b97bf3fd PL	141
b97bf3fd PL	142	/* Find device with specified name */
cb283ead	143
bcd326e8	144	read_lock(&dev_base_lock);
0e65967e	145	for_each_netdev(&init_net, pdev) {
cb283ead	146	if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) {
7562f876	147	dev = pdev;
bcd326e8	148	dev_hold(dev);
7562f876 PE	149	break;
7562f876 PE	150	}
cb283ead	151	}
bcd326e8	152	read_unlock(&dev_base_lock);
b97bf3fd PL	153	if (!dev)
	154	return -ENODEV;
	155
18abf0fb AS	156	/* Create Ethernet bearer for device */
	157
	158	eb_ptr->dev = dev;
	159	eb_ptr->tipc_packet_type.type = htons(ETH_P_TIPC);
	160	eb_ptr->tipc_packet_type.dev = dev;
	161	eb_ptr->tipc_packet_type.func = recv_msg;
	162	eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr;
	163	INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list));
	164	dev_add_pack(&eb_ptr->tipc_packet_type);
b97bf3fd PL	165
	166	/* Associate TIPC bearer with Ethernet bearer */
	167
	168	eb_ptr->bearer = tb_ptr;
	169	tb_ptr->usr_handle = (void *)eb_ptr;
	170	tb_ptr->mtu = dev->mtu;
c4307285	171	tb_ptr->blocked = 0;
b97bf3fd	172	tb_ptr->addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
3a6d54c5	173	memcpy(&tb_ptr->addr.dev_addr, dev->dev_addr, ETH_ALEN);
b97bf3fd PL	174	return 0;
	175	}
	176
	177	/**
c4307285	178	* disable_bearer - detach TIPC bearer from an Ethernet interface
b97bf3fd PL	179	*
	180	* We really should do dev_remove_pack() here, but this function can not be
	181	* called at tasklet level. => Use eth_bearer->bearer as a flag to throw away
	182	* incoming buffers, & postpone dev_remove_pack() to eth_media_stop() on exit.
	183	*/
	184
	185	static void disable_bearer(struct tipc_bearer *tb_ptr)
	186	{
1fc54d8f	187	((struct eth_bearer *)tb_ptr->usr_handle)->bearer = NULL;
b97bf3fd PL	188	}
	189
	190	/**
	191	* recv_notification - handle device updates from OS
	192	*
c4307285	193	* Change the state of the Ethernet bearer (if any) associated with the
b97bf3fd PL	194	* specified device.
	195	*/
	196
c4307285	197	static int recv_notification(struct notifier_block *nb, unsigned long evt,
b97bf3fd PL	198	void *dv)
	199	{
	200	struct net_device dev = (struct net_device )dv;
	201	struct eth_bearer *eb_ptr = &eth_bearers[0];
	202	struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];
	203
721499e8	204	if (!net_eq(dev_net(dev), &init_net))
e9dc8653 EB	205	return NOTIFY_DONE;
e9dc8653 EB	206
b97bf3fd PL	207	while ((eb_ptr->dev != dev)) {
	208	if (++eb_ptr == stop)
	209	return NOTIFY_DONE; /* couldn't find device */
	210	}
	211	if (!eb_ptr->bearer)
	212	return NOTIFY_DONE; /* bearer had been disabled */
	213
c4307285	214	eb_ptr->bearer->mtu = dev->mtu;
b97bf3fd PL	215
	216	switch (evt) {
	217	case NETDEV_CHANGE:
	218	if (netif_carrier_ok(dev))
	219	tipc_continue(eb_ptr->bearer);
	220	else
	221	tipc_block_bearer(eb_ptr->bearer->name);
	222	break;
	223	case NETDEV_UP:
	224	tipc_continue(eb_ptr->bearer);
	225	break;
	226	case NETDEV_DOWN:
	227	tipc_block_bearer(eb_ptr->bearer->name);
	228	break;
	229	case NETDEV_CHANGEMTU:
c4307285	230	case NETDEV_CHANGEADDR:
b97bf3fd	231	tipc_block_bearer(eb_ptr->bearer->name);
c4307285	232	tipc_continue(eb_ptr->bearer);
b97bf3fd PL	233	break;
b97bf3fd PL	234	case NETDEV_UNREGISTER:
c4307285	235	case NETDEV_CHANGENAME:
b97bf3fd PL	236	tipc_disable_bearer(eb_ptr->bearer->name);
	237	break;
	238	}
	239	return NOTIFY_OK;
	240	}
	241
	242	/**
	243	* eth_addr2str - convert Ethernet address to string
	244	*/
	245
c61b666e	246	static int eth_addr2str(struct tipc_media_addr a, char str_buf, int str_size)
c4307285	247	{
b97bf3fd PL	248	unchar addr = (unchar )&a->dev_addr;
b97bf3fd PL	249
c61b666e AS	250	if (str_size < 18) /* 18 = strlen("aa:bb:cc:dd:ee:ff\0") */
	251	return 1;
	252
	253	sprintf(str_buf, "%pM", addr);
	254	return 0;
b97bf3fd PL	255	}
b97bf3fd PL	256
706767da AS	257	/*
	258	* Ethernet media registration info
	259	*/
	260
	261	static struct media eth_media_info = {
	262	.send_msg = send_msg,
	263	.enable_bearer = enable_bearer,
	264	.disable_bearer = disable_bearer,
	265	.addr2str = eth_addr2str,
	266	.bcast_addr = { htonl(TIPC_MEDIA_TYPE_ETH),
	267	{ {0xff, 0xff, 0xff, 0xff, 0xff, 0xff} } },
	268	.priority = TIPC_DEF_LINK_PRI,
	269	.tolerance = TIPC_DEF_LINK_TOL,
	270	.window = TIPC_DEF_LINK_WIN,
	271	.type_id = TIPC_MEDIA_TYPE_ETH,
	272	.name = "eth"
	273	};
	274
b97bf3fd	275	/**
4323add6	276	* tipc_eth_media_start - activate Ethernet bearer support
b97bf3fd PL	277	*
	278	* Register Ethernet media type with TIPC bearer code. Also register
	279	* with OS for notifications about device state changes.
	280	*/
	281
4323add6	282	int tipc_eth_media_start(void)
c4307285	283	{
b97bf3fd PL	284	int res;
	285
	286	if (eth_started)
	287	return -EINVAL;
	288
b97bf3fd PL	289	memset(eth_bearers, 0, sizeof(eth_bearers));
b97bf3fd PL	290
706767da	291	res = tipc_register_media(&eth_media_info);
b97bf3fd PL	292	if (res)
	293	return res;
	294
	295	notifier.notifier_call = &recv_notification;
	296	notifier.priority = 0;
	297	res = register_netdevice_notifier(&notifier);
	298	if (!res)
	299	eth_started = 1;
	300	return res;
	301	}
	302
	303	/**
4323add6	304	* tipc_eth_media_stop - deactivate Ethernet bearer support
b97bf3fd PL	305	*/
b97bf3fd PL	306
4323add6	307	void tipc_eth_media_stop(void)
b97bf3fd PL	308	{
	309	int i;
	310
	311	if (!eth_started)
	312	return;
	313
	314	unregister_netdevice_notifier(&notifier);
	315	for (i = 0; i < MAX_ETH_BEARERS ; i++) {
	316	if (eth_bearers[i].bearer) {
	317	eth_bearers[i].bearer->blocked = 1;
1fc54d8f	318	eth_bearers[i].bearer = NULL;
b97bf3fd PL	319	}
	320	if (eth_bearers[i].dev) {
	321	dev_remove_pack(&eth_bearers[i].tipc_packet_type);
	322	dev_put(eth_bearers[i].dev);
	323	}
	324	}
	325	memset(&eth_bearers, 0, sizeof(eth_bearers));
	326	eth_started = 0;
	327	}