[deliverable/linux.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

#define ETH_ADDR_OFFSET	4	/* message header offset of MAC address */

/**
 * 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
 * @setup: work item used when enabling bearer
 * @cleanup: work item used when disabling bearer
 */
struct eth_bearer {
	struct tipc_bearer *bearer;
	struct net_device *dev;
	struct packet_type tipc_packet_type;
	struct work_struct setup;
	struct work_struct cleanup;
};

static struct tipc_media eth_media_info;
static struct eth_bearer eth_bearers[MAX_ETH_BEARERS];
static int eth_started;

static int recv_notification(struct notifier_block *nb, unsigned long evt,
			      void *dv);
/*
 * Network device notifier info
 */
static struct notifier_block notifier = {
	.notifier_call	= recv_notification,
	.priority	= 0
};

/**
 * eth_media_addr_set - initialize Ethernet media address structure
 *
 * Media-dependent "value" field stores MAC address in first 6 bytes
 * and zeroes out the remaining bytes.
 */
static void eth_media_addr_set(struct tipc_media_addr *a, char *mac)
{
	memcpy(a->value, mac, ETH_ALEN);
	memset(a->value + ETH_ALEN, 0, sizeof(a->value) - ETH_ALEN);
	a->media_id = TIPC_MEDIA_TYPE_ETH;
	a->broadcast = !memcmp(mac, eth_media_info.bcast_addr.value, ETH_ALEN);
}

/**
 * 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->value,
			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;
}

/**
 * setup_bearer - setup association between Ethernet bearer and interface
 */
static void setup_bearer(struct work_struct *work)
{
	struct eth_bearer *eb_ptr =
		container_of(work, struct eth_bearer, setup);

	dev_add_pack(&eb_ptr->tipc_packet_type);
}

/**
 * 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));
	INIT_WORK(&eb_ptr->setup, setup_bearer);
	schedule_work(&eb_ptr->setup);

	/* 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;
	eth_media_addr_set(&tb_ptr->addr, (char *)dev->dev_addr);
	return 0;
}

/**
 * cleanup_bearer - break association between Ethernet bearer and interface
 *
 * This routine must be invoked from a work queue because it can sleep.
 */
static void cleanup_bearer(struct work_struct *work)
{
	struct eth_bearer *eb_ptr =
		container_of(work, struct eth_bearer, cleanup);

	dev_remove_pack(&eb_ptr->tipc_packet_type);
	dev_put(eb_ptr->dev);
	eb_ptr->dev = NULL;
}

/**
 * disable_bearer - detach TIPC bearer from an Ethernet interface
 *
 * Mark Ethernet bearer as inactive so that incoming buffers are thrown away,
 * then get worker thread to complete bearer cleanup.  (Can't do cleanup
 * here because cleanup code needs to sleep and caller holds spinlocks.)
 */
static void disable_bearer(struct tipc_bearer *tb_ptr)
{
	struct eth_bearer *eb_ptr = (struct eth_bearer *)tb_ptr->usr_handle;

	eb_ptr->bearer = NULL;
	INIT_WORK(&eb_ptr->cleanup, cleanup_bearer);
	schedule_work(&eb_ptr->cleanup);
}

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

	sprintf(str_buf, "%pM", a->value);
	return 0;
}

/**
 * eth_str2addr - convert string to Ethernet address
 */
static int eth_str2addr(struct tipc_media_addr *a, char *str_buf)
{
	char mac[ETH_ALEN];
	int r;

	r = sscanf(str_buf, "%02x:%02x:%02x:%02x:%02x:%02x",
		       (u32 *)&mac[0], (u32 *)&mac[1], (u32 *)&mac[2],
		       (u32 *)&mac[3], (u32 *)&mac[4], (u32 *)&mac[5]);

	if (r != ETH_ALEN)
		return 1;

	eth_media_addr_set(a, mac);
	return 0;
}

/**
 * eth_str2addr - convert Ethernet address format to message header format
 */
static int eth_addr2msg(struct tipc_media_addr *a, char *msg_area)
{
	memset(msg_area, 0, TIPC_MEDIA_ADDR_SIZE);
	msg_area[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_ETH;
	memcpy(msg_area + ETH_ADDR_OFFSET, a->value, ETH_ALEN);
	return 0;
}

/**
 * eth_str2addr - convert message header address format to Ethernet format
 */
static int eth_msg2addr(struct tipc_media_addr *a, char *msg_area)
{
	if (msg_area[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_ETH)
		return 1;

	eth_media_addr_set(a, msg_area + ETH_ADDR_OFFSET);
	return 0;
}

/*
 * Ethernet media registration info
 */
static struct tipc_media eth_media_info = {
	.send_msg	= send_msg,
	.enable_bearer	= enable_bearer,
	.disable_bearer	= disable_bearer,
	.addr2str	= eth_addr2str,
	.str2addr	= eth_str2addr,
	.addr2msg	= eth_addr2msg,
	.msg2addr	= eth_msg2addr,
	.bcast_addr	= { { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff },
			    TIPC_MEDIA_TYPE_ETH, 1 },
	.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;

	res = tipc_register_media(&eth_media_info);
	if (res)
		return res;

	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)
{
	if (!eth_started)
		return;

	flush_scheduled_work();
	unregister_netdevice_notifier(&notifier);
	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	41
4d163a32 AS	42	#define ETH_ADDR_OFFSET 4 /* message header offset of MAC address */
4d163a32 AS	43
b97bf3fd PL	44	/**
	45	* struct eth_bearer - Ethernet bearer data structure
	46	* @bearer: ptr to associated "generic" bearer structure
	47	* @dev: ptr to associated Ethernet network device
	48	* @tipc_packet_type: used in binding TIPC to Ethernet driver
4225a398	49	* @setup: work item used when enabling bearer
64b32f7e	50	* @cleanup: work item used when disabling bearer
b97bf3fd	51	*/
b97bf3fd PL	52	struct eth_bearer {
	53	struct tipc_bearer *bearer;
	54	struct net_device *dev;
	55	struct packet_type tipc_packet_type;
4225a398	56	struct work_struct setup;
64b32f7e	57	struct work_struct cleanup;
b97bf3fd PL	58	};
b97bf3fd PL	59
358a0d1c	60	static struct tipc_media eth_media_info;
b97bf3fd	61	static struct eth_bearer eth_bearers[MAX_ETH_BEARERS];
e3ec9c7d	62	static int eth_started;
fa7f86f1 YX	63
	64	static int recv_notification(struct notifier_block *nb, unsigned long evt,
	65	void *dv);
	66	/*
	67	* Network device notifier info
	68	*/
	69	static struct notifier_block notifier = {
	70	.notifier_call = recv_notification,
	71	.priority = 0
	72	};
b97bf3fd	73
4d163a32 AS	74	/**
4d163a32 AS	75	* eth_media_addr_set - initialize Ethernet media address structure
3d749a6a AS	76	*
	77	* Media-dependent "value" field stores MAC address in first 6 bytes
	78	* and zeroes out the remaining bytes.
4d163a32	79	*/
4d163a32 AS	80	static void eth_media_addr_set(struct tipc_media_addr a, char mac)
4d163a32 AS	81	{
3d749a6a AS	82	memcpy(a->value, mac, ETH_ALEN);
	83	memset(a->value + ETH_ALEN, 0, sizeof(a->value) - ETH_ALEN);
	84	a->media_id = TIPC_MEDIA_TYPE_ETH;
	85	a->broadcast = !memcmp(mac, eth_media_info.bcast_addr.value, ETH_ALEN);
4d163a32 AS	86	}
4d163a32 AS	87
b97bf3fd	88	/**
c4307285	89	* send_msg - send a TIPC message out over an Ethernet interface
b97bf3fd	90	*/
c4307285	91	static int send_msg(struct sk_buff buf, struct tipc_bearer tb_ptr,
b97bf3fd PL	92	struct tipc_media_addr *dest)
	93	{
	94	struct sk_buff *clone;
	95	struct net_device *dev;
9fbfca01	96	int delta;
b97bf3fd PL	97
b97bf3fd PL	98	clone = skb_clone(buf, GFP_ATOMIC);
9fbfca01 AS	99	if (!clone)
	100	return 0;
	101
	102	dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
	103	delta = dev->hard_header_len - skb_headroom(buf);
	104
	105	if ((delta > 0) &&
	106	pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
	107	kfree_skb(clone);
	108	return 0;
b97bf3fd	109	}
9fbfca01 AS	110
	111	skb_reset_network_header(clone);
	112	clone->dev = dev;
3d749a6a	113	dev_hard_header(clone, dev, ETH_P_TIPC, dest->value,
9fbfca01 AS	114	dev->dev_addr, clone->len);
9fbfca01 AS	115	dev_queue_xmit(clone);
0e35fd5e	116	return 0;
b97bf3fd PL	117	}
	118
	119	/**
	120	* recv_msg - handle incoming TIPC message from an Ethernet interface
c4307285	121	*
f3ec75f6 AS	122	* Accept only packets explicitly sent to this node, or broadcast packets;
	123	* ignores packets sent using Ethernet multicast, and traffic sent to other
	124	* nodes (which can happen if interface is running in promiscuous mode).
b97bf3fd	125	*/
c4307285	126	static int recv_msg(struct sk_buff buf, struct net_device dev,
b97bf3fd PL	127	struct packet_type pt, struct net_device orig_dev)
	128	{
	129	struct eth_bearer eb_ptr = (struct eth_bearer )pt->af_packet_priv;
b97bf3fd	130
721499e8	131	if (!net_eq(dev_net(dev), &init_net)) {
e730c155 EB	132	kfree_skb(buf);
	133	return 0;
	134	}
	135
b97bf3fd	136	if (likely(eb_ptr->bearer)) {
f3ec75f6	137	if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
b2abd4c0 PG	138	buf->next = NULL;
	139	tipc_recv_msg(buf, eb_ptr->bearer);
	140	return 0;
b97bf3fd	141	}
b97bf3fd	142	}
5e3c8854	143	kfree_skb(buf);
0e35fd5e	144	return 0;
b97bf3fd PL	145	}
b97bf3fd PL	146
4225a398 YX	147	/**
	148	* setup_bearer - setup association between Ethernet bearer and interface
	149	*/
	150	static void setup_bearer(struct work_struct *work)
	151	{
	152	struct eth_bearer *eb_ptr =
	153	container_of(work, struct eth_bearer, setup);
	154
	155	dev_add_pack(&eb_ptr->tipc_packet_type);
	156	}
	157
b97bf3fd	158	/**
c4307285	159	* enable_bearer - attach TIPC bearer to an Ethernet interface
b97bf3fd	160	*/
b97bf3fd PL	161	static int enable_bearer(struct tipc_bearer *tb_ptr)
b97bf3fd PL	162	{
cb283ead JPM	163	struct net_device *dev = NULL;
cb283ead JPM	164	struct net_device *pdev = NULL;
b97bf3fd PL	165	struct eth_bearer *eb_ptr = &eth_bearers[0];
	166	struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];
	167	char driver_name = strchr((const char )tb_ptr->name, ':') + 1;
d1fb6279 AS	168	int pending_dev = 0;
	169
	170	/* Find unused Ethernet bearer structure */
d1fb6279 AS	171	while (eb_ptr->dev) {
	172	if (!eb_ptr->bearer)
	173	pending_dev++;
	174	if (++eb_ptr == stop)
	175	return pending_dev ? -EAGAIN : -EDQUOT;
	176	}
b97bf3fd PL	177
b97bf3fd PL	178	/* Find device with specified name */
bcd326e8	179	read_lock(&dev_base_lock);
0e65967e	180	for_each_netdev(&init_net, pdev) {
cb283ead	181	if (!strncmp(pdev->name, driver_name, IFNAMSIZ)) {
7562f876	182	dev = pdev;
bcd326e8	183	dev_hold(dev);
7562f876 PE	184	break;
7562f876 PE	185	}
cb283ead	186	}
bcd326e8	187	read_unlock(&dev_base_lock);
b97bf3fd PL	188	if (!dev)
	189	return -ENODEV;
	190
18abf0fb	191	/* Create Ethernet bearer for device */
18abf0fb AS	192	eb_ptr->dev = dev;
	193	eb_ptr->tipc_packet_type.type = htons(ETH_P_TIPC);
	194	eb_ptr->tipc_packet_type.dev = dev;
	195	eb_ptr->tipc_packet_type.func = recv_msg;
	196	eb_ptr->tipc_packet_type.af_packet_priv = eb_ptr;
	197	INIT_LIST_HEAD(&(eb_ptr->tipc_packet_type.list));
4225a398 YX	198	INIT_WORK(&eb_ptr->setup, setup_bearer);
4225a398 YX	199	schedule_work(&eb_ptr->setup);
b97bf3fd PL	200
b97bf3fd PL	201	/* Associate TIPC bearer with Ethernet bearer */
b97bf3fd PL	202	eb_ptr->bearer = tb_ptr;
	203	tb_ptr->usr_handle = (void *)eb_ptr;
	204	tb_ptr->mtu = dev->mtu;
c4307285	205	tb_ptr->blocked = 0;
4d163a32	206	eth_media_addr_set(&tb_ptr->addr, (char *)dev->dev_addr);
b97bf3fd PL	207	return 0;
	208	}
	209
64b32f7e AS	210	/**
	211	* cleanup_bearer - break association between Ethernet bearer and interface
	212	*
	213	* This routine must be invoked from a work queue because it can sleep.
	214	*/
64b32f7e AS	215	static void cleanup_bearer(struct work_struct *work)
	216	{
	217	struct eth_bearer *eb_ptr =
	218	container_of(work, struct eth_bearer, cleanup);
	219
	220	dev_remove_pack(&eb_ptr->tipc_packet_type);
	221	dev_put(eb_ptr->dev);
	222	eb_ptr->dev = NULL;
	223	}
	224
b97bf3fd	225	/**
c4307285	226	* disable_bearer - detach TIPC bearer from an Ethernet interface
b97bf3fd	227	*
64b32f7e AS	228	* Mark Ethernet bearer as inactive so that incoming buffers are thrown away,
	229	* then get worker thread to complete bearer cleanup. (Can't do cleanup
	230	* here because cleanup code needs to sleep and caller holds spinlocks.)
b97bf3fd	231	*/
b97bf3fd PL	232	static void disable_bearer(struct tipc_bearer *tb_ptr)
b97bf3fd PL	233	{
64b32f7e AS	234	struct eth_bearer eb_ptr = (struct eth_bearer )tb_ptr->usr_handle;
	235
	236	eb_ptr->bearer = NULL;
	237	INIT_WORK(&eb_ptr->cleanup, cleanup_bearer);
	238	schedule_work(&eb_ptr->cleanup);
b97bf3fd PL	239	}
	240
	241	/**
	242	* recv_notification - handle device updates from OS
	243	*
c4307285	244	* Change the state of the Ethernet bearer (if any) associated with the
b97bf3fd PL	245	* specified device.
b97bf3fd PL	246	*/
c4307285	247	static int recv_notification(struct notifier_block *nb, unsigned long evt,
b97bf3fd PL	248	void *dv)
	249	{
	250	struct net_device dev = (struct net_device )dv;
	251	struct eth_bearer *eb_ptr = &eth_bearers[0];
	252	struct eth_bearer *stop = &eth_bearers[MAX_ETH_BEARERS];
	253
721499e8	254	if (!net_eq(dev_net(dev), &init_net))
e9dc8653 EB	255	return NOTIFY_DONE;
e9dc8653 EB	256
b97bf3fd PL	257	while ((eb_ptr->dev != dev)) {
	258	if (++eb_ptr == stop)
	259	return NOTIFY_DONE; /* couldn't find device */
	260	}
	261	if (!eb_ptr->bearer)
	262	return NOTIFY_DONE; /* bearer had been disabled */
	263
c4307285	264	eb_ptr->bearer->mtu = dev->mtu;
b97bf3fd PL	265
	266	switch (evt) {
	267	case NETDEV_CHANGE:
	268	if (netif_carrier_ok(dev))
	269	tipc_continue(eb_ptr->bearer);
	270	else
	271	tipc_block_bearer(eb_ptr->bearer->name);
	272	break;
	273	case NETDEV_UP:
	274	tipc_continue(eb_ptr->bearer);
	275	break;
	276	case NETDEV_DOWN:
	277	tipc_block_bearer(eb_ptr->bearer->name);
	278	break;
	279	case NETDEV_CHANGEMTU:
c4307285	280	case NETDEV_CHANGEADDR:
b97bf3fd	281	tipc_block_bearer(eb_ptr->bearer->name);
c4307285	282	tipc_continue(eb_ptr->bearer);
b97bf3fd PL	283	break;
b97bf3fd PL	284	case NETDEV_UNREGISTER:
c4307285	285	case NETDEV_CHANGENAME:
b97bf3fd PL	286	tipc_disable_bearer(eb_ptr->bearer->name);
	287	break;
	288	}
	289	return NOTIFY_OK;
	290	}
	291
	292	/**
	293	* eth_addr2str - convert Ethernet address to string
	294	*/
c61b666e	295	static int eth_addr2str(struct tipc_media_addr a, char str_buf, int str_size)
c4307285	296	{
c61b666e AS	297	if (str_size < 18) /* 18 = strlen("aa:bb:cc:dd:ee:ff\0") */
	298	return 1;
	299
3d749a6a	300	sprintf(str_buf, "%pM", a->value);
c61b666e	301	return 0;
b97bf3fd PL	302	}
b97bf3fd PL	303
4d163a32 AS	304	/**
	305	* eth_str2addr - convert string to Ethernet address
	306	*/
4d163a32 AS	307	static int eth_str2addr(struct tipc_media_addr a, char str_buf)
	308	{
	309	char mac[ETH_ALEN];
	310	int r;
	311
	312	r = sscanf(str_buf, "%02x:%02x:%02x:%02x:%02x:%02x",
	313	(u32 )&mac[0], (u32 )&mac[1], (u32 *)&mac[2],
	314	(u32 )&mac[3], (u32 )&mac[4], (u32 *)&mac[5]);
	315
	316	if (r != ETH_ALEN)
	317	return 1;
	318
	319	eth_media_addr_set(a, mac);
	320	return 0;
	321	}
	322
	323	/**
	324	* eth_str2addr - convert Ethernet address format to message header format
	325	*/
4d163a32 AS	326	static int eth_addr2msg(struct tipc_media_addr a, char msg_area)
	327	{
	328	memset(msg_area, 0, TIPC_MEDIA_ADDR_SIZE);
	329	msg_area[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_ETH;
3d749a6a	330	memcpy(msg_area + ETH_ADDR_OFFSET, a->value, ETH_ALEN);
4d163a32 AS	331	return 0;
	332	}
	333
	334	/**
	335	* eth_str2addr - convert message header address format to Ethernet format
	336	*/
4d163a32 AS	337	static int eth_msg2addr(struct tipc_media_addr a, char msg_area)
	338	{
	339	if (msg_area[TIPC_MEDIA_TYPE_OFFSET] != TIPC_MEDIA_TYPE_ETH)
	340	return 1;
	341
	342	eth_media_addr_set(a, msg_area + ETH_ADDR_OFFSET);
	343	return 0;
	344	}
	345
706767da AS	346	/*
	347	* Ethernet media registration info
	348	*/
358a0d1c	349	static struct tipc_media eth_media_info = {
706767da AS	350	.send_msg = send_msg,
	351	.enable_bearer = enable_bearer,
	352	.disable_bearer = disable_bearer,
	353	.addr2str = eth_addr2str,
4d163a32 AS	354	.str2addr = eth_str2addr,
	355	.addr2msg = eth_addr2msg,
	356	.msg2addr = eth_msg2addr,
3d749a6a AS	357	.bcast_addr = { { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff },
3d749a6a AS	358	TIPC_MEDIA_TYPE_ETH, 1 },
706767da AS	359	.priority = TIPC_DEF_LINK_PRI,
	360	.tolerance = TIPC_DEF_LINK_TOL,
	361	.window = TIPC_DEF_LINK_WIN,
	362	.type_id = TIPC_MEDIA_TYPE_ETH,
	363	.name = "eth"
	364	};
	365
b97bf3fd	366	/**
4323add6	367	* tipc_eth_media_start - activate Ethernet bearer support
b97bf3fd PL	368	*
	369	* Register Ethernet media type with TIPC bearer code. Also register
	370	* with OS for notifications about device state changes.
	371	*/
4323add6	372	int tipc_eth_media_start(void)
c4307285	373	{
b97bf3fd PL	374	int res;
	375
	376	if (eth_started)
	377	return -EINVAL;
	378
706767da	379	res = tipc_register_media(&eth_media_info);
b97bf3fd PL	380	if (res)
	381	return res;
	382
b97bf3fd PL	383	res = register_netdevice_notifier(&notifier);
	384	if (!res)
	385	eth_started = 1;
	386	return res;
	387	}
	388
	389	/**
4323add6	390	* tipc_eth_media_stop - deactivate Ethernet bearer support
b97bf3fd	391	*/
4323add6	392	void tipc_eth_media_stop(void)
b97bf3fd	393	{
b97bf3fd PL	394	if (!eth_started)
	395	return;
	396
64b32f7e	397	flush_scheduled_work();
b97bf3fd	398	unregister_netdevice_notifier(&notifier);
b97bf3fd PL	399	eth_started = 0;
b97bf3fd PL	400	}