[linux-2.6-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) 2005-2007, 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>
#include <linux/slab.h>
#include <net/net_namespace.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;
	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).
 * 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 (!net_eq(dev_net(dev), &init_net)) {
		kfree_skb(buf);
		return 0;
	}

	if (likely(eb_ptr->bearer)) {
		if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
			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 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 */

	for_each_netdev(&init_net, pdev){
		if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) {
			dev = pdev;
			break;
		}
	}
	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 = 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];

	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 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, "%pM", addr);
	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	*
f3ec75f6 AS	4	* Copyright (c) 2001-2007, Ericsson AB
f3ec75f6 AS	5	* Copyright (c) 2005-2007, 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>
5a0e3ad6	41	#include <linux/slab.h>
e730c155	42	#include <net/net_namespace.h>
b97bf3fd PL	43
b97bf3fd PL	44	#define MAX_ETH_BEARERS 2
16cb4b33	45	#define ETH_LINK_PRIORITY TIPC_DEF_LINK_PRI
b97bf3fd	46	#define ETH_LINK_TOLERANCE TIPC_DEF_LINK_TOL
16cb4b33	47	#define ETH_LINK_WINDOW TIPC_DEF_LINK_WIN
b97bf3fd PL	48
	49	/**
	50	* struct eth_bearer - Ethernet bearer data structure
	51	* @bearer: ptr to associated "generic" bearer structure
	52	* @dev: ptr to associated Ethernet network device
	53	* @tipc_packet_type: used in binding TIPC to Ethernet driver
	54	*/
c4307285	55
b97bf3fd PL	56	struct eth_bearer {
	57	struct tipc_bearer *bearer;
	58	struct net_device *dev;
	59	struct packet_type tipc_packet_type;
	60	};
	61
	62	static struct eth_bearer eth_bearers[MAX_ETH_BEARERS];
	63	static int eth_started = 0;
	64	static struct notifier_block notifier;
	65
	66	/**
c4307285	67	* send_msg - send a TIPC message out over an Ethernet interface
b97bf3fd PL	68	*/
b97bf3fd PL	69
c4307285	70	static int send_msg(struct sk_buff buf, struct tipc_bearer tb_ptr,
b97bf3fd PL	71	struct tipc_media_addr *dest)
	72	{
	73	struct sk_buff *clone;
	74	struct net_device *dev;
9fbfca01	75	int delta;
b97bf3fd PL	76
b97bf3fd PL	77	clone = skb_clone(buf, GFP_ATOMIC);
9fbfca01 AS	78	if (!clone)
	79	return 0;
	80
	81	dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
	82	delta = dev->hard_header_len - skb_headroom(buf);
	83
	84	if ((delta > 0) &&
	85	pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
	86	kfree_skb(clone);
	87	return 0;
b97bf3fd	88	}
9fbfca01 AS	89
	90	skb_reset_network_header(clone);
	91	clone->dev = dev;
	92	dev_hard_header(clone, dev, ETH_P_TIPC, &dest->dev_addr.eth_addr,
	93	dev->dev_addr, clone->len);
	94	dev_queue_xmit(clone);
0e35fd5e	95	return 0;
b97bf3fd PL	96	}
	97
	98	/**
	99	* recv_msg - handle incoming TIPC message from an Ethernet interface
c4307285	100	*
f3ec75f6 AS	101	* Accept only packets explicitly sent to this node, or broadcast packets;
	102	* ignores packets sent using Ethernet multicast, and traffic sent to other
	103	* nodes (which can happen if interface is running in promiscuous mode).
b97bf3fd PL	104	* Routine truncates any Ethernet padding/CRC appended to the message,
	105	* and ensures message size matches actual length
	106	*/
	107
c4307285	108	static int recv_msg(struct sk_buff buf, struct net_device dev,
b97bf3fd PL	109	struct packet_type pt, struct net_device orig_dev)
	110	{
	111	struct eth_bearer eb_ptr = (struct eth_bearer )pt->af_packet_priv;
	112	u32 size;
	113
721499e8	114	if (!net_eq(dev_net(dev), &init_net)) {
e730c155 EB	115	kfree_skb(buf);
	116	return 0;
	117	}
	118
b97bf3fd	119	if (likely(eb_ptr->bearer)) {
f3ec75f6	120	if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
c4307285 YH	121	size = msg_size((struct tipc_msg *)buf->data);
	122	skb_trim(buf, size);
	123	if (likely(buf->len == size)) {
	124	buf->next = NULL;
	125	tipc_recv_msg(buf, eb_ptr->bearer);
0e35fd5e	126	return 0;
5e3c8854	127	}
b97bf3fd	128	}
b97bf3fd	129	}
5e3c8854	130	kfree_skb(buf);
0e35fd5e	131	return 0;
b97bf3fd PL	132	}
	133
	134	/**
c4307285	135	* enable_bearer - attach TIPC bearer to an Ethernet interface
b97bf3fd PL	136	*/
	137
	138	static int enable_bearer(struct tipc_bearer *tb_ptr)
	139	{
cb283ead JPM	140	struct net_device *dev = NULL;
cb283ead JPM	141	struct net_device *pdev = NULL;
b97bf3fd PL	142	struct eth_bearer *eb_ptr = &eth_bearers[0];
	143	struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];
	144	char driver_name = strchr((const char )tb_ptr->name, ':') + 1;
d1fb6279 AS	145	int pending_dev = 0;
	146
	147	/* Find unused Ethernet bearer structure */
	148
	149	while (eb_ptr->dev) {
	150	if (!eb_ptr->bearer)
	151	pending_dev++;
	152	if (++eb_ptr == stop)
	153	return pending_dev ? -EAGAIN : -EDQUOT;
	154	}
b97bf3fd PL	155
b97bf3fd PL	156	/* Find device with specified name */
cb283ead	157
881d966b	158	for_each_netdev(&init_net, pdev){
cb283ead	159	if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) {
7562f876 PE	160	dev = pdev;
	161	break;
	162	}
cb283ead	163	}
b97bf3fd PL	164	if (!dev)
	165	return -ENODEV;
	166
	167	/* Find Ethernet bearer for device (or create one) */
	168
	169	for (;(eb_ptr != stop) && eb_ptr->dev && (eb_ptr->dev != dev); eb_ptr++);
	170	if (eb_ptr == stop)
	171	return -EDQUOT;
	172	if (!eb_ptr->dev) {
	173	eb_ptr->dev = dev;
02ea4923	174	eb_ptr->tipc_packet_type.type = htons(ETH_P_TIPC);
b97bf3fd PL	175	eb_ptr->tipc_packet_type.dev = dev;
	176	eb_ptr->tipc_packet_type.func = recv_msg;
	177	eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr;
	178	INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list));
	179	dev_hold(dev);
	180	dev_add_pack(&eb_ptr->tipc_packet_type);
	181	}
	182
	183	/* Associate TIPC bearer with Ethernet bearer */
	184
	185	eb_ptr->bearer = tb_ptr;
	186	tb_ptr->usr_handle = (void *)eb_ptr;
	187	tb_ptr->mtu = dev->mtu;
c4307285	188	tb_ptr->blocked = 0;
b97bf3fd	189	tb_ptr->addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
3a6d54c5	190	memcpy(&tb_ptr->addr.dev_addr, dev->dev_addr, ETH_ALEN);
b97bf3fd PL	191	return 0;
	192	}
	193
	194	/**
c4307285	195	* disable_bearer - detach TIPC bearer from an Ethernet interface
b97bf3fd PL	196	*
	197	* We really should do dev_remove_pack() here, but this function can not be
	198	* called at tasklet level. => Use eth_bearer->bearer as a flag to throw away
	199	* incoming buffers, & postpone dev_remove_pack() to eth_media_stop() on exit.
	200	*/
	201
	202	static void disable_bearer(struct tipc_bearer *tb_ptr)
	203	{
1fc54d8f	204	((struct eth_bearer *)tb_ptr->usr_handle)->bearer = NULL;
b97bf3fd PL	205	}
	206
	207	/**
	208	* recv_notification - handle device updates from OS
	209	*
c4307285	210	* Change the state of the Ethernet bearer (if any) associated with the
b97bf3fd PL	211	* specified device.
	212	*/
	213
c4307285	214	static int recv_notification(struct notifier_block *nb, unsigned long evt,
b97bf3fd PL	215	void *dv)
	216	{
	217	struct net_device dev = (struct net_device )dv;
	218	struct eth_bearer *eb_ptr = &eth_bearers[0];
	219	struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];
	220
721499e8	221	if (!net_eq(dev_net(dev), &init_net))
e9dc8653 EB	222	return NOTIFY_DONE;
e9dc8653 EB	223
b97bf3fd PL	224	while ((eb_ptr->dev != dev)) {
	225	if (++eb_ptr == stop)
	226	return NOTIFY_DONE; /* couldn't find device */
	227	}
	228	if (!eb_ptr->bearer)
	229	return NOTIFY_DONE; /* bearer had been disabled */
	230
c4307285	231	eb_ptr->bearer->mtu = dev->mtu;
b97bf3fd PL	232
	233	switch (evt) {
	234	case NETDEV_CHANGE:
	235	if (netif_carrier_ok(dev))
	236	tipc_continue(eb_ptr->bearer);
	237	else
	238	tipc_block_bearer(eb_ptr->bearer->name);
	239	break;
	240	case NETDEV_UP:
	241	tipc_continue(eb_ptr->bearer);
	242	break;
	243	case NETDEV_DOWN:
	244	tipc_block_bearer(eb_ptr->bearer->name);
	245	break;
	246	case NETDEV_CHANGEMTU:
c4307285	247	case NETDEV_CHANGEADDR:
b97bf3fd	248	tipc_block_bearer(eb_ptr->bearer->name);
c4307285	249	tipc_continue(eb_ptr->bearer);
b97bf3fd PL	250	break;
b97bf3fd PL	251	case NETDEV_UNREGISTER:
c4307285	252	case NETDEV_CHANGENAME:
b97bf3fd PL	253	tipc_disable_bearer(eb_ptr->bearer->name);
	254	break;
	255	}
	256	return NOTIFY_OK;
	257	}
	258
	259	/**
	260	* eth_addr2str - convert Ethernet address to string
	261	*/
	262
	263	static char eth_addr2str(struct tipc_media_addr a, char *str_buf, int str_size)
c4307285	264	{
b97bf3fd PL	265	unchar addr = (unchar )&a->dev_addr;
	266
	267	if (str_size < 18)
	268	*str_buf = '\0';
	269	else
e174961c	270	sprintf(str_buf, "%pM", addr);
b97bf3fd PL	271	return str_buf;
	272	}
	273
	274	/**
4323add6	275	* tipc_eth_media_start - activate Ethernet bearer support
b97bf3fd PL	276	*
	277	* Register Ethernet media type with TIPC bearer code. Also register
	278	* with OS for notifications about device state changes.
	279	*/
	280
4323add6	281	int tipc_eth_media_start(void)
c4307285	282	{
b97bf3fd PL	283	struct tipc_media_addr bcast_addr;
	284	int res;
	285
	286	if (eth_started)
	287	return -EINVAL;
	288
49384507 AS	289	bcast_addr.type = htonl(TIPC_MEDIA_TYPE_ETH);
	290	memset(&bcast_addr.dev_addr, 0xff, ETH_ALEN);
	291
b97bf3fd PL	292	memset(eth_bearers, 0, sizeof(eth_bearers));
	293
	294	res = tipc_register_media(TIPC_MEDIA_TYPE_ETH, "eth",
c4307285 YH	295	enable_bearer, disable_bearer, send_msg,
c4307285 YH	296	eth_addr2str, &bcast_addr, ETH_LINK_PRIORITY,
16cb4b33	297	ETH_LINK_TOLERANCE, ETH_LINK_WINDOW);
b97bf3fd PL	298	if (res)
	299	return res;
	300
	301	notifier.notifier_call = &recv_notification;
	302	notifier.priority = 0;
	303	res = register_netdevice_notifier(&notifier);
	304	if (!res)
	305	eth_started = 1;
	306	return res;
	307	}
	308
	309	/**
4323add6	310	* tipc_eth_media_stop - deactivate Ethernet bearer support
b97bf3fd PL	311	*/
b97bf3fd PL	312
4323add6	313	void tipc_eth_media_stop(void)
b97bf3fd PL	314	{
	315	int i;
	316
	317	if (!eth_started)
	318	return;
	319
	320	unregister_netdevice_notifier(&notifier);
	321	for (i = 0; i < MAX_ETH_BEARERS ; i++) {
	322	if (eth_bearers[i].bearer) {
	323	eth_bearers[i].bearer->blocked = 1;
1fc54d8f	324	eth_bearers[i].bearer = NULL;
b97bf3fd PL	325	}
	326	if (eth_bearers[i].dev) {
	327	dev_remove_pack(&eth_bearers[i].tipc_packet_type);
	328	dev_put(eth_bearers[i].dev);
	329	}
	330	}
	331	memset(&eth_bearers, 0, sizeof(eth_bearers));
	332	eth_started = 0;
	333	}