[mirror_ubuntu-bionic-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
 *
 * Need to simulate user ioctl because not all device's that support
 * ethtool, use ethtool_ops.  Also, since driver might sleep need to
 * not be holding any locks.
 */
static int port_cost(struct net_device *dev)
{
	struct ethtool_cmd ecmd = { ETHTOOL_GSET };
	struct ifreq ifr;
	mm_segment_t old_fs;
	int err;

	strncpy(ifr.ifr_name, dev->name, IFNAMSIZ);
	ifr.ifr_data = (void __user *) &ecmd;

	old_fs = get_fs();
	set_fs(KERNEL_DS);
	err = dev_ethtool(&ifr);
	set_fs(old_fs);
	
	if (!err) {
		switch(ecmd.speed) {
		case SPEED_100:
			return 19;
		case SPEED_1000:
			return 4;
		case SPEED_10000:
			return 2;
		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.
 */
static void port_carrier_check(void *arg)
{
	struct net_bridge_port *p = arg;

	rtnl_lock();
	if (netif_carrier_ok(p->dev)) {
		u32 cost = port_cost(p->dev);

		spin_lock_bh(&p->br->lock);
		if (p->state == BR_STATE_DISABLED) {
			p->path_cost = cost;
			br_stp_enable_port(p);
		}
		spin_unlock_bh(&p->br->lock);
	} else {
		spin_lock_bh(&p->br->lock);
		if (p->state != BR_STATE_DISABLED)
			br_stp_disable_port(p);
		spin_unlock_bh(&p->br->lock);
	}
	rtnl_unlock();
}

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

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

	br_sysfs_freeif(p);
}

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);
}

/* called with RTNL */
static void del_nbp(struct net_bridge_port *p)
{
	struct net_bridge *br = p->br;
	struct net_device *dev = p->dev;

	dev->br_port = NULL;
	dev_set_promiscuity(dev, -1);

	cancel_delayed_work(&p->carrier_check);
	flush_scheduled_work();

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

	br_fdb_delete_by_port(br, p);

	list_del_rcu(&p->list);

	del_timer_sync(&p->message_age_timer);
	del_timer_sync(&p->forward_delay_timer);
	del_timer_sync(&p->hold_timer);
	
	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) {
		br_sysfs_removeif(p);
		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;
	memset(br->bridge_id.addr, 0, ETH_ALEN);

	br->feature_mask = dev->features;
	br->stp_enabled = 0;
	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 = kmalloc(BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long),
			GFP_KERNEL);
	if (!inuse)
		return -ENOMEM;

	memset(inuse, 0, BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long));
	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 = kmalloc(sizeof(*p), GFP_KERNEL);
	if (p == NULL)
		return ERR_PTR(-ENOMEM);

	memset(p, 0, sizeof(*p));
	p->br = br;
	dev_hold(dev);
	p->dev = dev;
	p->path_cost = port_cost(dev);
 	p->priority = 0x8000 >> BR_PORT_BITS;
	dev->br_port = p;
	p->port_no = index;
	br_init_port(p);
	p->state = BR_STATE_DISABLED;
	INIT_WORK(&p->carrier_check, port_carrier_check, p);
	kobject_init(&p->kobj);

	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)
			goto err1;
	}

	ret = register_netdevice(dev);
	if (ret)
		goto err2;

	/* network device kobject is not setup until
	 * after rtnl_unlock does it's hotplug magic.
	 * so hold reference to avoid race.
	 */
	dev_hold(dev);
	rtnl_unlock();

	ret = br_sysfs_addbr(dev);
	dev_put(dev);

	if (ret) 
		unregister_netdev(dev);
 out:
	return ret;

 err2:
	free_netdev(dev);
 err1:
	rtnl_unlock();
	goto out;
}

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

	rtnl_lock();
	dev = __dev_get_by_name(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, checksum;

	features = br->feature_mask &~ NETIF_F_IP_CSUM;
	checksum = br->feature_mask & NETIF_F_IP_CSUM;

	list_for_each_entry(p, &br->port_list, list) {
		if (!(p->dev->features 
		      & (NETIF_F_IP_CSUM|NETIF_F_NO_CSUM|NETIF_F_HW_CSUM)))
			checksum = 0;
		features &= p->dev->features;
	}

	br->dev->features = features | checksum | NETIF_F_LLTX;
}

/* 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;

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

 	if ((err = br_fdb_insert(br, p, dev->dev_addr)))
		destroy_nbp(p);
 
	else if ((err = br_sysfs_addif(p)))
		del_nbp(p);
	else {
		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 ((br->dev->flags & IFF_UP) 
		    && (dev->flags & IFF_UP) && netif_carrier_ok(dev))
			br_stp_enable_port(p);
		spin_unlock_bh(&br->lock);

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

	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;

	br_sysfs_removeif(p);
	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 (dev = dev_base; dev; dev = nxt) {
		nxt = dev->next;
		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	*
	32	* Need to simulate user ioctl because not all device's that support
	33	* ethtool, use ethtool_ops. Also, since driver might sleep need to
	34	* not be holding any locks.
	35	*/
4433f420	36	static int port_cost(struct net_device *dev)
1da177e4	37	{
1da177e4 LT	38	struct ethtool_cmd ecmd = { ETHTOOL_GSET };
	39	struct ifreq ifr;
	40	mm_segment_t old_fs;
	41	int err;
	42
	43	strncpy(ifr.ifr_name, dev->name, IFNAMSIZ);
	44	ifr.ifr_data = (void __user *) &ecmd;
	45
	46	old_fs = get_fs();
	47	set_fs(KERNEL_DS);
	48	err = dev_ethtool(&ifr);
	49	set_fs(old_fs);
	50
	51	if (!err) {
	52	switch(ecmd.speed) {
	53	case SPEED_100:
	54	return 19;
	55	case SPEED_1000:
	56	return 4;
	57	case SPEED_10000:
	58	return 2;
	59	case SPEED_10:
	60	return 100;
1da177e4 LT	61	}
	62	}
	63
	64	/* Old silly heuristics based on name */
	65	if (!strncmp(dev->name, "lec", 3))
	66	return 7;
	67
	68	if (!strncmp(dev->name, "plip", 4))
	69	return 2500;
	70
	71	return 100; /* assume old 10Mbps */
	72	}
	73
4433f420 SH	74
	75	/*
	76	* Check for port carrier transistions.
	77	* Called from work queue to allow for calling functions that
	78	* might sleep (such as speed check), and to debounce.
	79	*/
	80	static void port_carrier_check(void *arg)
	81	{
	82	struct net_bridge_port *p = arg;
	83
	84	rtnl_lock();
	85	if (netif_carrier_ok(p->dev)) {
	86	u32 cost = port_cost(p->dev);
	87
	88	spin_lock_bh(&p->br->lock);
	89	if (p->state == BR_STATE_DISABLED) {
	90	p->path_cost = cost;
	91	br_stp_enable_port(p);
	92	}
	93	spin_unlock_bh(&p->br->lock);
	94	} else {
	95	spin_lock_bh(&p->br->lock);
	96	if (p->state != BR_STATE_DISABLED)
	97	br_stp_disable_port(p);
	98	spin_unlock_bh(&p->br->lock);
	99	}
	100	rtnl_unlock();
	101	}
	102
1da177e4 LT	103	static void destroy_nbp(struct net_bridge_port *p)
	104	{
	105	struct net_device *dev = p->dev;
	106
1da177e4 LT	107	p->br = NULL;
	108	p->dev = NULL;
	109	dev_put(dev);
	110
	111	br_sysfs_freeif(p);
	112	}
	113
	114	static void destroy_nbp_rcu(struct rcu_head *head)
	115	{
	116	struct net_bridge_port *p =
	117	container_of(head, struct net_bridge_port, rcu);
	118	destroy_nbp(p);
	119	}
	120
	121	/* called with RTNL */
	122	static void del_nbp(struct net_bridge_port *p)
	123	{
	124	struct net_bridge *br = p->br;
	125	struct net_device *dev = p->dev;
	126
ab4060e8	127	dev->br_port = NULL;
1da177e4 LT	128	dev_set_promiscuity(dev, -1);
1da177e4 LT	129
4433f420 SH	130	cancel_delayed_work(&p->carrier_check);
	131	flush_scheduled_work();
	132
1da177e4 LT	133	spin_lock_bh(&br->lock);
	134	br_stp_disable_port(p);
	135	spin_unlock_bh(&br->lock);
	136
	137	br_fdb_delete_by_port(br, p);
	138
	139	list_del_rcu(&p->list);
	140
	141	del_timer_sync(&p->message_age_timer);
	142	del_timer_sync(&p->forward_delay_timer);
	143	del_timer_sync(&p->hold_timer);
	144
	145	call_rcu(&p->rcu, destroy_nbp_rcu);
	146	}
	147
	148	/* called with RTNL */
	149	static void del_br(struct net_bridge *br)
	150	{
	151	struct net_bridge_port p, n;
	152
	153	list_for_each_entry_safe(p, n, &br->port_list, list) {
	154	br_sysfs_removeif(p);
	155	del_nbp(p);
	156	}
	157
	158	del_timer_sync(&br->gc_timer);
	159
	160	br_sysfs_delbr(br->dev);
	161	unregister_netdevice(br->dev);
	162	}
	163
	164	static struct net_device new_bridge_dev(const char name)
	165	{
	166	struct net_bridge *br;
	167	struct net_device *dev;
	168
	169	dev = alloc_netdev(sizeof(struct net_bridge), name,
	170	br_dev_setup);
	171
	172	if (!dev)
	173	return NULL;
	174
	175	br = netdev_priv(dev);
	176	br->dev = dev;
	177
	178	spin_lock_init(&br->lock);
	179	INIT_LIST_HEAD(&br->port_list);
	180	spin_lock_init(&br->hash_lock);
	181
	182	br->bridge_id.prio[0] = 0x80;
	183	br->bridge_id.prio[1] = 0x00;
	184	memset(br->bridge_id.addr, 0, ETH_ALEN);
	185
edb5e46f	186	br->feature_mask = dev->features;
1da177e4 LT	187	br->stp_enabled = 0;
	188	br->designated_root = br->bridge_id;
	189	br->root_path_cost = 0;
	190	br->root_port = 0;
	191	br->bridge_max_age = br->max_age = 20 * HZ;
	192	br->bridge_hello_time = br->hello_time = 2 * HZ;
	193	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
	194	br->topology_change = 0;
	195	br->topology_change_detected = 0;
	196	br->ageing_time = 300 * HZ;
	197	INIT_LIST_HEAD(&br->age_list);
	198
	199	br_stp_timer_init(br);
	200
	201	return dev;
	202	}
	203
	204	/* find an available port number */
	205	static int find_portno(struct net_bridge *br)
	206	{
	207	int index;
	208	struct net_bridge_port *p;
	209	unsigned long *inuse;
	210
	211	inuse = kmalloc(BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long),
	212	GFP_KERNEL);
	213	if (!inuse)
	214	return -ENOMEM;
	215
	216	memset(inuse, 0, BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long));
	217	set_bit(0, inuse); /* zero is reserved */
	218	list_for_each_entry(p, &br->port_list, list) {
	219	set_bit(p->port_no, inuse);
	220	}
	221	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	222	kfree(inuse);
	223
	224	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
	225	}
	226
4433f420	227	/* called with RTNL but without bridge lock */
1da177e4	228	static struct net_bridge_port new_nbp(struct net_bridge br,
4433f420	229	struct net_device *dev)
1da177e4 LT	230	{
	231	int index;
	232	struct net_bridge_port *p;
	233
	234	index = find_portno(br);
	235	if (index < 0)
	236	return ERR_PTR(index);
	237
	238	p = kmalloc(sizeof(*p), GFP_KERNEL);
	239	if (p == NULL)
	240	return ERR_PTR(-ENOMEM);
	241
	242	memset(p, 0, sizeof(*p));
	243	p->br = br;
	244	dev_hold(dev);
	245	p->dev = dev;
4433f420	246	p->path_cost = port_cost(dev);
1da177e4 LT	247	p->priority = 0x8000 >> BR_PORT_BITS;
	248	dev->br_port = p;
	249	p->port_no = index;
	250	br_init_port(p);
	251	p->state = BR_STATE_DISABLED;
4433f420	252	INIT_WORK(&p->carrier_check, port_carrier_check, p);
1da177e4 LT	253	kobject_init(&p->kobj);
	254
	255	return p;
	256	}
	257
	258	int br_add_bridge(const char *name)
	259	{
	260	struct net_device *dev;
	261	int ret;
	262
	263	dev = new_bridge_dev(name);
	264	if (!dev)
	265	return -ENOMEM;
	266
	267	rtnl_lock();
	268	if (strchr(dev->name, '%')) {
	269	ret = dev_alloc_name(dev, dev->name);
	270	if (ret < 0)
	271	goto err1;
	272	}
	273
	274	ret = register_netdevice(dev);
	275	if (ret)
	276	goto err2;
	277
	278	/* network device kobject is not setup until
	279	* after rtnl_unlock does it's hotplug magic.
	280	* so hold reference to avoid race.
	281	*/
	282	dev_hold(dev);
	283	rtnl_unlock();
	284
	285	ret = br_sysfs_addbr(dev);
	286	dev_put(dev);
	287
	288	if (ret)
	289	unregister_netdev(dev);
	290	out:
	291	return ret;
	292
	293	err2:
	294	free_netdev(dev);
	295	err1:
	296	rtnl_unlock();
	297	goto out;
	298	}
	299
	300	int br_del_bridge(const char *name)
	301	{
	302	struct net_device *dev;
	303	int ret = 0;
	304
	305	rtnl_lock();
	306	dev = __dev_get_by_name(name);
	307	if (dev == NULL)
	308	ret = -ENXIO; /* Could not find device */
	309
	310	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
	311	/* Attempt to delete non bridge device! */
	312	ret = -EPERM;
	313	}
	314
	315	else if (dev->flags & IFF_UP) {
	316	/* Not shutdown yet. */
317	ret = -EBUSY;
318	}
319
320	else
321	del_br(netdev_priv(dev));
322
323	rtnl_unlock();
324	return ret;
325	}
326
46f25dff	327	/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1da177e4 LT	328	int br_min_mtu(const struct net_bridge *br)
	329	{
	330	const struct net_bridge_port *p;
	331	int mtu = 0;
	332
	333	ASSERT_RTNL();
	334
	335	if (list_empty(&br->port_list))
46f25dff	336	mtu = ETH_DATA_LEN;
1da177e4 LT	337	else {
	338	list_for_each_entry(p, &br->port_list, list) {
	339	if (!mtu \|\| p->dev->mtu < mtu)
	340	mtu = p->dev->mtu;
	341	}
	342	}
	343	return mtu;
	344	}
	345
81d35307 SH	346	/*
	347	* Recomputes features using slave's features
	348	*/
	349	void br_features_recompute(struct net_bridge *br)
	350	{
	351	struct net_bridge_port *p;
	352	unsigned long features, checksum;
	353
edb5e46f SH	354	features = br->feature_mask &~ NETIF_F_IP_CSUM;
edb5e46f SH	355	checksum = br->feature_mask & NETIF_F_IP_CSUM;
81d35307 SH	356
	357	list_for_each_entry(p, &br->port_list, list) {
	358	if (!(p->dev->features
	359	& (NETIF_F_IP_CSUM\|NETIF_F_NO_CSUM\|NETIF_F_HW_CSUM)))
	360	checksum = 0;
	361	features &= p->dev->features;
	362	}
	363
	364	br->dev->features = features \| checksum \| NETIF_F_LLTX;
	365	}
	366
1da177e4 LT	367	/* called with RTNL */
	368	int br_add_if(struct net_bridge br, struct net_device dev)
	369	{
	370	struct net_bridge_port *p;
	371	int err = 0;
	372
	373	if (dev->flags & IFF_LOOPBACK \|\| dev->type != ARPHRD_ETHER)
	374	return -EINVAL;
	375
	376	if (dev->hard_start_xmit == br_dev_xmit)
	377	return -ELOOP;
	378
	379	if (dev->br_port != NULL)
	380	return -EBUSY;
	381
4433f420	382	if (IS_ERR(p = new_nbp(br, dev)))
1da177e4 LT	383	return PTR_ERR(p);
	384
	385	if ((err = br_fdb_insert(br, p, dev->dev_addr)))
	386	destroy_nbp(p);
	387
	388	else if ((err = br_sysfs_addif(p)))
	389	del_nbp(p);
	390	else {
	391	dev_set_promiscuity(dev, 1);
	392
	393	list_add_rcu(&p->list, &br->port_list);
	394
	395	spin_lock_bh(&br->lock);
	396	br_stp_recalculate_bridge_id(br);
133747e8	397	br_features_recompute(br);
1da177e4 LT	398	if ((br->dev->flags & IFF_UP)
	399	&& (dev->flags & IFF_UP) && netif_carrier_ok(dev))
	400	br_stp_enable_port(p);
	401	spin_unlock_bh(&br->lock);
	402
	403	dev_set_mtu(br->dev, br_min_mtu(br));
	404	}
	405
	406	return err;
	407	}
	408
	409	/* called with RTNL */
	410	int br_del_if(struct net_bridge br, struct net_device dev)
	411	{
	412	struct net_bridge_port *p = dev->br_port;
	413
	414	if (!p \|\| p->br != br)
	415	return -EINVAL;
	416
	417	br_sysfs_removeif(p);
	418	del_nbp(p);
	419
	420	spin_lock_bh(&br->lock);
	421	br_stp_recalculate_bridge_id(br);
81d35307	422	br_features_recompute(br);
1da177e4 LT	423	spin_unlock_bh(&br->lock);
	424
	425	return 0;
	426	}
	427
	428	void __exit br_cleanup_bridges(void)
	429	{
	430	struct net_device dev, nxt;
	431
	432	rtnl_lock();
	433	for (dev = dev_base; dev; dev = nxt) {
	434	nxt = dev->next;
	435	if (dev->priv_flags & IFF_EBRIDGE)
	436	del_br(dev->priv);
	437	}
	438	rtnl_unlock();
	439
	440	}