[mirror_ubuntu-zesty-kernel.git] / net / bridge / br_if.c

/*
 *	Userspace interface
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<buytenh@gnu.org>
 *
 *	$Id: br_if.c,v 1.7 2001/12/24 00:59:55 davem Exp $
 *
 *	This program is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU General Public License
 *	as published by the Free Software Foundation; either version
 *	2 of the License, or (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/if_arp.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/rtnetlink.h>
#include <linux/if_ether.h>
#include <net/sock.h>

#include "br_private.h"

/*
 * Determine initial path cost based on speed.
 * using recommendations from 802.1d standard
 *
 * Since driver might sleep need to not be holding any locks.
 */
static int port_cost(struct net_device *dev)
{
	if (dev->ethtool_ops && dev->ethtool_ops->get_settings) {
		struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET, };

		if (!dev->ethtool_ops->get_settings(dev, &ecmd)) {
			switch(ecmd.speed) {
			case SPEED_10000:
				return 2;
			case SPEED_1000:
				return 4;
			case SPEED_100:
				return 19;
			case SPEED_10:
				return 100;
			}
		}
	}

	/* Old silly heuristics based on name */
	if (!strncmp(dev->name, "lec", 3))
		return 7;

	if (!strncmp(dev->name, "plip", 4))
		return 2500;

	return 100;	/* assume old 10Mbps */
}


/*
 * Check for port carrier transistions.
 * Called from work queue to allow for calling functions that
 * might sleep (such as speed check), and to debounce.
 */
void br_port_carrier_check(struct net_bridge_port *p)
{
	struct net_device *dev = p->dev;
	struct net_bridge *br = p->br;

	if (netif_carrier_ok(dev))
		p->path_cost = port_cost(dev);

	if (netif_running(br->dev)) {
		spin_lock_bh(&br->lock);
		if (netif_carrier_ok(dev)) {
			if (p->state == BR_STATE_DISABLED)
				br_stp_enable_port(p);
		} else {
			if (p->state != BR_STATE_DISABLED)
				br_stp_disable_port(p);
		}
		spin_unlock_bh(&br->lock);
	}
}

static void release_nbp(struct kobject *kobj)
{
	struct net_bridge_port *p
		= container_of(kobj, struct net_bridge_port, kobj);
	kfree(p);
}

static struct kobj_type brport_ktype = {
#ifdef CONFIG_SYSFS
	.sysfs_ops = &brport_sysfs_ops,
#endif
	.release = release_nbp,
};

static void destroy_nbp(struct net_bridge_port *p)
{
	struct net_device *dev = p->dev;

	p->br = NULL;
	p->dev = NULL;
	dev_put(dev);

	kobject_put(&p->kobj);
}

static void destroy_nbp_rcu(struct rcu_head *head)
{
	struct net_bridge_port *p =
			container_of(head, struct net_bridge_port, rcu);
	destroy_nbp(p);
}

/* Delete port(interface) from bridge is done in two steps.
 * via RCU. First step, marks device as down. That deletes
 * all the timers and stops new packets from flowing through.
 *
 * Final cleanup doesn't occur until after all CPU's finished
 * processing packets.
 *
 * Protected from multiple admin operations by RTNL mutex
 */
static void del_nbp(struct net_bridge_port *p)
{
	struct net_bridge *br = p->br;
	struct net_device *dev = p->dev;

	sysfs_remove_link(br->ifobj, dev->name);

	dev_set_promiscuity(dev, -1);

	spin_lock_bh(&br->lock);
	br_stp_disable_port(p);
	spin_unlock_bh(&br->lock);

	br_ifinfo_notify(RTM_DELLINK, p);

	br_fdb_delete_by_port(br, p, 1);

	list_del_rcu(&p->list);

	rcu_assign_pointer(dev->br_port, NULL);

	kobject_uevent(&p->kobj, KOBJ_REMOVE);
	kobject_del(&p->kobj);

	call_rcu(&p->rcu, destroy_nbp_rcu);
}

/* called with RTNL */
static void del_br(struct net_bridge *br)
{
	struct net_bridge_port *p, *n;

	list_for_each_entry_safe(p, n, &br->port_list, list) {
		del_nbp(p);
	}

	del_timer_sync(&br->gc_timer);

	br_sysfs_delbr(br->dev);
	unregister_netdevice(br->dev);
}

static struct net_device *new_bridge_dev(const char *name)
{
	struct net_bridge *br;
	struct net_device *dev;

	dev = alloc_netdev(sizeof(struct net_bridge), name,
			   br_dev_setup);

	if (!dev)
		return NULL;

	br = netdev_priv(dev);
	br->dev = dev;

	spin_lock_init(&br->lock);
	INIT_LIST_HEAD(&br->port_list);
	spin_lock_init(&br->hash_lock);

	br->bridge_id.prio[0] = 0x80;
	br->bridge_id.prio[1] = 0x00;

	memcpy(br->group_addr, br_group_address, ETH_ALEN);

	br->feature_mask = dev->features;
	br->stp_enabled = BR_NO_STP;
	br->designated_root = br->bridge_id;
	br->root_path_cost = 0;
	br->root_port = 0;
	br->bridge_max_age = br->max_age = 20 * HZ;
	br->bridge_hello_time = br->hello_time = 2 * HZ;
	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
	br->topology_change = 0;
	br->topology_change_detected = 0;
	br->ageing_time = 300 * HZ;
	INIT_LIST_HEAD(&br->age_list);

	br_stp_timer_init(br);

	return dev;
}

/* find an available port number */
static int find_portno(struct net_bridge *br)
{
	int index;
	struct net_bridge_port *p;
	unsigned long *inuse;

	inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
			GFP_KERNEL);
	if (!inuse)
		return -ENOMEM;

	set_bit(0, inuse);	/* zero is reserved */
	list_for_each_entry(p, &br->port_list, list) {
		set_bit(p->port_no, inuse);
	}
	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	kfree(inuse);

	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
}

/* called with RTNL but without bridge lock */
static struct net_bridge_port *new_nbp(struct net_bridge *br,
				       struct net_device *dev)
{
	int index;
	struct net_bridge_port *p;

	index = find_portno(br);
	if (index < 0)
		return ERR_PTR(index);

	p = kzalloc(sizeof(*p), GFP_KERNEL);
	if (p == NULL)
		return ERR_PTR(-ENOMEM);

	p->br = br;
	dev_hold(dev);
	p->dev = dev;
	p->path_cost = port_cost(dev);
	p->priority = 0x8000 >> BR_PORT_BITS;
	p->port_no = index;
	br_init_port(p);
	p->state = BR_STATE_DISABLED;
	br_stp_port_timer_init(p);

	return p;
}

int br_add_bridge(const char *name)
{
	struct net_device *dev;
	int ret;

	dev = new_bridge_dev(name);
	if (!dev)
		return -ENOMEM;

	rtnl_lock();
	if (strchr(dev->name, '%')) {
		ret = dev_alloc_name(dev, dev->name);
		if (ret < 0) {
			free_netdev(dev);
			goto out;
		}
	}

	ret = register_netdevice(dev);
	if (ret)
		goto out;

	ret = br_sysfs_addbr(dev);
	if (ret)
		unregister_netdevice(dev);
 out:
	rtnl_unlock();
	return ret;
}

int br_del_bridge(const char *name)
{
	struct net_device *dev;
	int ret = 0;

	rtnl_lock();
	dev = __dev_get_by_name(&init_net, name);
	if (dev == NULL)
		ret =  -ENXIO; 	/* Could not find device */

	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
		/* Attempt to delete non bridge device! */
		ret = -EPERM;
	}

	else if (dev->flags & IFF_UP) {
		/* Not shutdown yet. */
		ret = -EBUSY;
	}

	else
		del_br(netdev_priv(dev));

	rtnl_unlock();
	return ret;
}

/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
int br_min_mtu(const struct net_bridge *br)
{
	const struct net_bridge_port *p;
	int mtu = 0;

	ASSERT_RTNL();

	if (list_empty(&br->port_list))
		mtu = ETH_DATA_LEN;
	else {
		list_for_each_entry(p, &br->port_list, list) {
			if (!mtu  || p->dev->mtu < mtu)
				mtu = p->dev->mtu;
		}
	}
	return mtu;
}

/*
 * Recomputes features using slave's features
 */
void br_features_recompute(struct net_bridge *br)
{
	struct net_bridge_port *p;
	unsigned long features;

	features = br->feature_mask;

	list_for_each_entry(p, &br->port_list, list) {
		features = netdev_compute_features(features, p->dev->features);
	}

	br->dev->features = features;
}

/* called with RTNL */
int br_add_if(struct net_bridge *br, struct net_device *dev)
{
	struct net_bridge_port *p;
	int err = 0;

	if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER)
		return -EINVAL;

	if (dev->hard_start_xmit == br_dev_xmit)
		return -ELOOP;

	if (dev->br_port != NULL)
		return -EBUSY;

	p = new_nbp(br, dev);
	if (IS_ERR(p))
		return PTR_ERR(p);

	err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
				   SYSFS_BRIDGE_PORT_ATTR);
	if (err)
		goto err0;

	err = br_fdb_insert(br, p, dev->dev_addr);
	if (err)
		goto err1;

	err = br_sysfs_addif(p);
	if (err)
		goto err2;

	rcu_assign_pointer(dev->br_port, p);
	dev_set_promiscuity(dev, 1);

	list_add_rcu(&p->list, &br->port_list);

	spin_lock_bh(&br->lock);
	br_stp_recalculate_bridge_id(br);
	br_features_recompute(br);

	if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
	    (br->dev->flags & IFF_UP))
		br_stp_enable_port(p);
	spin_unlock_bh(&br->lock);

	br_ifinfo_notify(RTM_NEWLINK, p);

	dev_set_mtu(br->dev, br_min_mtu(br));

	kobject_uevent(&p->kobj, KOBJ_ADD);

	return 0;
err2:
	br_fdb_delete_by_port(br, p, 1);
err1:
	kobject_del(&p->kobj);
	return err;
err0:
	kobject_put(&p->kobj);
	return err;
}

/* called with RTNL */
int br_del_if(struct net_bridge *br, struct net_device *dev)
{
	struct net_bridge_port *p = dev->br_port;

	if (!p || p->br != br)
		return -EINVAL;

	del_nbp(p);

	spin_lock_bh(&br->lock);
	br_stp_recalculate_bridge_id(br);
	br_features_recompute(br);
	spin_unlock_bh(&br->lock);

	return 0;
}

void __exit br_cleanup_bridges(void)
{
	struct net_device *dev, *nxt;

	rtnl_lock();
	for_each_netdev_safe(&init_net, dev, nxt)
		if (dev->priv_flags & IFF_EBRIDGE)
			del_br(dev->priv);
	rtnl_unlock();

}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Userspace interface
	3	* Linux ethernet bridge
	4	*
	5	* Authors:
	6	* Lennert Buytenhek <buytenh@gnu.org>
	7	*
	8	* $Id: br_if.c,v 1.7 2001/12/24 00:59:55 davem Exp $
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version
	13	* 2 of the License, or (at your option) any later version.
	14	*/
	15
	16	#include <linux/kernel.h>
	17	#include <linux/netdevice.h>
	18	#include <linux/ethtool.h>
	19	#include <linux/if_arp.h>
	20	#include <linux/module.h>
	21	#include <linux/init.h>
	22	#include <linux/rtnetlink.h>
46f25dff	23	#include <linux/if_ether.h>
1da177e4 LT	24	#include <net/sock.h>
	25
	26	#include "br_private.h"
	27
	28	/*
	29	* Determine initial path cost based on speed.
	30	* using recommendations from 802.1d standard
	31	*
61a44b9c	32	* Since driver might sleep need to not be holding any locks.
1da177e4	33	*/
4433f420	34	static int port_cost(struct net_device *dev)
1da177e4	35	{
b4a488d1 SH	36	if (dev->ethtool_ops && dev->ethtool_ops->get_settings) {
	37	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET, };
	38
	39	if (!dev->ethtool_ops->get_settings(dev, &ecmd)) {
61a44b9c	40	switch(ecmd.speed) {
61a44b9c MW	41	case SPEED_10000:
61a44b9c MW	42	return 2;
b4a488d1 SH	43	case SPEED_1000:
	44	return 4;
	45	case SPEED_100:
	46	return 19;
61a44b9c MW	47	case SPEED_10:
	48	return 100;
	49	}
1da177e4 LT	50	}
	51	}
	52
	53	/* Old silly heuristics based on name */
	54	if (!strncmp(dev->name, "lec", 3))
	55	return 7;
	56
	57	if (!strncmp(dev->name, "plip", 4))
	58	return 2500;
	59
	60	return 100; /* assume old 10Mbps */
	61	}
	62
4433f420 SH	63
	64	/*
	65	* Check for port carrier transistions.
	66	* Called from work queue to allow for calling functions that
	67	* might sleep (such as speed check), and to debounce.
	68	*/
269def7c	69	void br_port_carrier_check(struct net_bridge_port *p)
4433f420	70	{
269def7c SH	71	struct net_device *dev = p->dev;
269def7c SH	72	struct net_bridge *br = p->br;
6e86b890 SH	73
	74	if (netif_carrier_ok(dev))
	75	p->path_cost = port_cost(dev);
	76
269def7c	77	if (netif_running(br->dev)) {
6e86b890 SH	78	spin_lock_bh(&br->lock);
	79	if (netif_carrier_ok(dev)) {
	80	if (p->state == BR_STATE_DISABLED)
	81	br_stp_enable_port(p);
	82	} else {
	83	if (p->state != BR_STATE_DISABLED)
	84	br_stp_disable_port(p);
4433f420	85	}
6e86b890	86	spin_unlock_bh(&br->lock);
4433f420	87	}
4433f420 SH	88	}
4433f420 SH	89
bab1deea SH	90	static void release_nbp(struct kobject *kobj)
	91	{
	92	struct net_bridge_port *p
	93	= container_of(kobj, struct net_bridge_port, kobj);
	94	kfree(p);
	95	}
	96
	97	static struct kobj_type brport_ktype = {
	98	#ifdef CONFIG_SYSFS
	99	.sysfs_ops = &brport_sysfs_ops,
	100	#endif
	101	.release = release_nbp,
	102	};
	103
1da177e4 LT	104	static void destroy_nbp(struct net_bridge_port *p)
	105	{
	106	struct net_device *dev = p->dev;
	107
1da177e4 LT	108	p->br = NULL;
	109	p->dev = NULL;
	110	dev_put(dev);
	111
bab1deea	112	kobject_put(&p->kobj);
1da177e4 LT	113	}
	114
	115	static void destroy_nbp_rcu(struct rcu_head *head)
	116	{
	117	struct net_bridge_port *p =
	118	container_of(head, struct net_bridge_port, rcu);
	119	destroy_nbp(p);
	120	}
	121
3f4cfc2d SH	122	/* Delete port(interface) from bridge is done in two steps.
	123	* via RCU. First step, marks device as down. That deletes
	124	* all the timers and stops new packets from flowing through.
	125	*
	126	* Final cleanup doesn't occur until after all CPU's finished
	127	* processing packets.
	128	*
	129	* Protected from multiple admin operations by RTNL mutex
	130	*/
1da177e4 LT	131	static void del_nbp(struct net_bridge_port *p)
	132	{
	133	struct net_bridge *br = p->br;
	134	struct net_device *dev = p->dev;
	135
43b98c4a	136	sysfs_remove_link(br->ifobj, dev->name);
bab1deea	137
1da177e4 LT	138	dev_set_promiscuity(dev, -1);
	139
	140	spin_lock_bh(&br->lock);
	141	br_stp_disable_port(p);
	142	spin_unlock_bh(&br->lock);
	143
b86c4503 SH	144	br_ifinfo_notify(RTM_DELLINK, p);
b86c4503 SH	145
1a620698	146	br_fdb_delete_by_port(br, p, 1);
1da177e4 LT	147
	148	list_del_rcu(&p->list);
	149
b3f1be4b SH	150	rcu_assign_pointer(dev->br_port, NULL);
b3f1be4b SH	151
125a12cc	152	kobject_uevent(&p->kobj, KOBJ_REMOVE);
bab1deea SH	153	kobject_del(&p->kobj);
bab1deea SH	154
1da177e4 LT	155	call_rcu(&p->rcu, destroy_nbp_rcu);
	156	}
	157
	158	/* called with RTNL */
	159	static void del_br(struct net_bridge *br)
	160	{
	161	struct net_bridge_port p, n;
	162
	163	list_for_each_entry_safe(p, n, &br->port_list, list) {
1da177e4 LT	164	del_nbp(p);
	165	}
	166
	167	del_timer_sync(&br->gc_timer);
	168
	169	br_sysfs_delbr(br->dev);
9d6f229f	170	unregister_netdevice(br->dev);
1da177e4 LT	171	}
	172
	173	static struct net_device new_bridge_dev(const char name)
	174	{
	175	struct net_bridge *br;
	176	struct net_device *dev;
	177
	178	dev = alloc_netdev(sizeof(struct net_bridge), name,
	179	br_dev_setup);
9d6f229f	180
1da177e4 LT	181	if (!dev)
	182	return NULL;
	183
	184	br = netdev_priv(dev);
	185	br->dev = dev;
	186
	187	spin_lock_init(&br->lock);
	188	INIT_LIST_HEAD(&br->port_list);
	189	spin_lock_init(&br->hash_lock);
	190
	191	br->bridge_id.prio[0] = 0x80;
	192	br->bridge_id.prio[1] = 0x00;
cee48541 SH	193
cee48541 SH	194	memcpy(br->group_addr, br_group_address, ETH_ALEN);
1da177e4	195
edb5e46f	196	br->feature_mask = dev->features;
9cde0708	197	br->stp_enabled = BR_NO_STP;
1da177e4 LT	198	br->designated_root = br->bridge_id;
	199	br->root_path_cost = 0;
	200	br->root_port = 0;
	201	br->bridge_max_age = br->max_age = 20 * HZ;
	202	br->bridge_hello_time = br->hello_time = 2 * HZ;
	203	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
	204	br->topology_change = 0;
	205	br->topology_change_detected = 0;
	206	br->ageing_time = 300 * HZ;
	207	INIT_LIST_HEAD(&br->age_list);
	208
	209	br_stp_timer_init(br);
	210
	211	return dev;
	212	}
	213
	214	/* find an available port number */
	215	static int find_portno(struct net_bridge *br)
	216	{
	217	int index;
	218	struct net_bridge_port *p;
	219	unsigned long *inuse;
	220
3b781fa1	221	inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
1da177e4 LT	222	GFP_KERNEL);
	223	if (!inuse)
	224	return -ENOMEM;
	225
1da177e4 LT	226	set_bit(0, inuse); /* zero is reserved */
	227	list_for_each_entry(p, &br->port_list, list) {
	228	set_bit(p->port_no, inuse);
	229	}
	230	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	231	kfree(inuse);
	232
	233	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
	234	}
	235
4433f420	236	/* called with RTNL but without bridge lock */
9d6f229f	237	static struct net_bridge_port new_nbp(struct net_bridge br,
4433f420	238	struct net_device *dev)
1da177e4 LT	239	{
	240	int index;
	241	struct net_bridge_port *p;
9d6f229f	242
1da177e4 LT	243	index = find_portno(br);
	244	if (index < 0)
	245	return ERR_PTR(index);
	246
cee48541	247	p = kzalloc(sizeof(*p), GFP_KERNEL);
1da177e4 LT	248	if (p == NULL)
	249	return ERR_PTR(-ENOMEM);
	250
1da177e4 LT	251	p->br = br;
	252	dev_hold(dev);
	253	p->dev = dev;
4433f420	254	p->path_cost = port_cost(dev);
9d6f229f	255	p->priority = 0x8000 >> BR_PORT_BITS;
1da177e4 LT	256	p->port_no = index;
	257	br_init_port(p);
	258	p->state = BR_STATE_DISABLED;
d32439c0	259	br_stp_port_timer_init(p);
1da177e4 LT	260
	261	return p;
	262	}
	263
	264	int br_add_bridge(const char *name)
	265	{
	266	struct net_device *dev;
	267	int ret;
	268
	269	dev = new_bridge_dev(name);
9d6f229f	270	if (!dev)
1da177e4 LT	271	return -ENOMEM;
	272
	273	rtnl_lock();
	274	if (strchr(dev->name, '%')) {
	275	ret = dev_alloc_name(dev, dev->name);
36485707 JB	276	if (ret < 0) {
	277	free_netdev(dev);
	278	goto out;
	279	}
1da177e4 LT	280	}
	281
	282	ret = register_netdevice(dev);
	283	if (ret)
36485707	284	goto out;
1da177e4	285
1da177e4	286	ret = br_sysfs_addbr(dev);
ac05202e	287	if (ret)
36485707 JB	288	unregister_netdevice(dev);
36485707 JB	289	out:
1da177e4	290	rtnl_unlock();
ac05202e	291	return ret;
1da177e4 LT	292	}
	293
	294	int br_del_bridge(const char *name)
	295	{
	296	struct net_device *dev;
	297	int ret = 0;
	298
	299	rtnl_lock();
881d966b	300	dev = __dev_get_by_name(&init_net, name);
9d6f229f	301	if (dev == NULL)
1da177e4 LT	302	ret = -ENXIO; /* Could not find device */
	303
	304	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
	305	/* Attempt to delete non bridge device! */
	306	ret = -EPERM;
	307	}
	308
	309	else if (dev->flags & IFF_UP) {
	310	/* Not shutdown yet. */
	311	ret = -EBUSY;
9d6f229f	312	}
1da177e4	313
9d6f229f	314	else
1da177e4 LT	315	del_br(netdev_priv(dev));
	316
	317	rtnl_unlock();
	318	return ret;
	319	}
	320
46f25dff	321	/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1da177e4 LT	322	int br_min_mtu(const struct net_bridge *br)
	323	{
	324	const struct net_bridge_port *p;
	325	int mtu = 0;
	326
	327	ASSERT_RTNL();
	328
	329	if (list_empty(&br->port_list))
46f25dff	330	mtu = ETH_DATA_LEN;
1da177e4 LT	331	else {
	332	list_for_each_entry(p, &br->port_list, list) {
	333	if (!mtu \|\| p->dev->mtu < mtu)
	334	mtu = p->dev->mtu;
	335	}
	336	}
	337	return mtu;
	338	}
	339
81d35307 SH	340	/*
	341	* Recomputes features using slave's features
	342	*/
	343	void br_features_recompute(struct net_bridge *br)
	344	{
	345	struct net_bridge_port *p;
7f353bf2	346	unsigned long features;
81d35307	347
7f353bf2	348	features = br->feature_mask;
81d35307 SH	349
81d35307 SH	350	list_for_each_entry(p, &br->port_list, list) {
7f353bf2	351	features = netdev_compute_features(features, p->dev->features);
81d35307 SH	352	}
81d35307 SH	353
7f353bf2	354	br->dev->features = features;
81d35307 SH	355	}
81d35307 SH	356
1da177e4 LT	357	/* called with RTNL */
	358	int br_add_if(struct net_bridge br, struct net_device dev)
	359	{
	360	struct net_bridge_port *p;
	361	int err = 0;
	362
	363	if (dev->flags & IFF_LOOPBACK \|\| dev->type != ARPHRD_ETHER)
	364	return -EINVAL;
	365
	366	if (dev->hard_start_xmit == br_dev_xmit)
	367	return -ELOOP;
	368
	369	if (dev->br_port != NULL)
	370	return -EBUSY;
	371
bab1deea SH	372	p = new_nbp(br, dev);
bab1deea SH	373	if (IS_ERR(p))
1da177e4 LT	374	return PTR_ERR(p);
1da177e4 LT	375
e32cc736 GKH	376	err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
e32cc736 GKH	377	SYSFS_BRIDGE_PORT_ATTR);
bab1deea SH	378	if (err)
bab1deea SH	379	goto err0;
1da177e4	380
9d6f229f	381	err = br_fdb_insert(br, p, dev->dev_addr);
bab1deea SH	382	if (err)
bab1deea SH	383	goto err1;
1da177e4	384
bab1deea SH	385	err = br_sysfs_addif(p);
	386	if (err)
	387	goto err2;
1da177e4	388
bab1deea SH	389	rcu_assign_pointer(dev->br_port, p);
	390	dev_set_promiscuity(dev, 1);
	391
	392	list_add_rcu(&p->list, &br->port_list);
	393
	394	spin_lock_bh(&br->lock);
	395	br_stp_recalculate_bridge_id(br);
	396	br_features_recompute(br);
de79059e AS	397
	398	if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
	399	(br->dev->flags & IFF_UP))
	400	br_stp_enable_port(p);
bab1deea SH	401	spin_unlock_bh(&br->lock);
bab1deea SH	402
b86c4503 SH	403	br_ifinfo_notify(RTM_NEWLINK, p);
b86c4503 SH	404
bab1deea	405	dev_set_mtu(br->dev, br_min_mtu(br));
269def7c	406
bab1deea	407	kobject_uevent(&p->kobj, KOBJ_ADD);
1da177e4	408
bab1deea SH	409	return 0;
bab1deea SH	410	err2:
1a620698	411	br_fdb_delete_by_port(br, p, 1);
bab1deea SH	412	err1:
bab1deea SH	413	kobject_del(&p->kobj);
e32cc736	414	return err;
bab1deea SH	415	err0:
bab1deea SH	416	kobject_put(&p->kobj);
1da177e4 LT	417	return err;
	418	}
	419
	420	/* called with RTNL */
	421	int br_del_if(struct net_bridge br, struct net_device dev)
	422	{
	423	struct net_bridge_port *p = dev->br_port;
9d6f229f YH	424
9d6f229f YH	425	if (!p \|\| p->br != br)
1da177e4 LT	426	return -EINVAL;
1da177e4 LT	427
1da177e4 LT	428	del_nbp(p);
	429
	430	spin_lock_bh(&br->lock);
	431	br_stp_recalculate_bridge_id(br);
81d35307	432	br_features_recompute(br);
1da177e4 LT	433	spin_unlock_bh(&br->lock);
	434
	435	return 0;
	436	}
	437
	438	void __exit br_cleanup_bridges(void)
	439	{
	440	struct net_device dev, nxt;
	441
	442	rtnl_lock();
881d966b	443	for_each_netdev_safe(&init_net, dev, nxt)
1da177e4 LT	444	if (dev->priv_flags & IFF_EBRIDGE)
1da177e4 LT	445	del_br(dev->priv);
1da177e4 LT	446	rtnl_unlock();
	447
	448	}