[net-next-2.6.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_device *dev = arg;
	struct net_bridge_port *p;

	rtnl_lock();
	p = dev->br_port;
	if (!p)
		goto done;

	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);
	}
done:
	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);
}

/* 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;

	dev_set_promiscuity(dev, -1);

	cancel_delayed_work(&p->carrier_check);

	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);

	rcu_assign_pointer(dev->br_port, NULL);

	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;
	p->port_no = index;
	br_init_port(p);
	p->state = BR_STATE_DISABLED;
	INIT_WORK(&p->carrier_check, port_carrier_check, dev);
	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 {
		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 ((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	{
b3f1be4b SH	82	struct net_device *dev = arg;
b3f1be4b SH	83	struct net_bridge_port *p;
4433f420 SH	84
4433f420 SH	85	rtnl_lock();
b3f1be4b SH	86	p = dev->br_port;
	87	if (!p)
	88	goto done;
	89
4433f420 SH	90	if (netif_carrier_ok(p->dev)) {
	91	u32 cost = port_cost(p->dev);
	92
	93	spin_lock_bh(&p->br->lock);
	94	if (p->state == BR_STATE_DISABLED) {
	95	p->path_cost = cost;
	96	br_stp_enable_port(p);
	97	}
	98	spin_unlock_bh(&p->br->lock);
	99	} else {
	100	spin_lock_bh(&p->br->lock);
	101	if (p->state != BR_STATE_DISABLED)
	102	br_stp_disable_port(p);
	103	spin_unlock_bh(&p->br->lock);
	104	}
b3f1be4b	105	done:
4433f420 SH	106	rtnl_unlock();
	107	}
	108
1da177e4 LT	109	static void destroy_nbp(struct net_bridge_port *p)
	110	{
	111	struct net_device *dev = p->dev;
	112
1da177e4 LT	113	p->br = NULL;
	114	p->dev = NULL;
	115	dev_put(dev);
	116
	117	br_sysfs_freeif(p);
	118	}
	119
	120	static void destroy_nbp_rcu(struct rcu_head *head)
	121	{
	122	struct net_bridge_port *p =
	123	container_of(head, struct net_bridge_port, rcu);
	124	destroy_nbp(p);
	125	}
	126
3f4cfc2d SH	127	/* Delete port(interface) from bridge is done in two steps.
	128	* via RCU. First step, marks device as down. That deletes
	129	* all the timers and stops new packets from flowing through.
	130	*
	131	* Final cleanup doesn't occur until after all CPU's finished
	132	* processing packets.
	133	*
	134	* Protected from multiple admin operations by RTNL mutex
	135	*/
1da177e4 LT	136	static void del_nbp(struct net_bridge_port *p)
	137	{
	138	struct net_bridge *br = p->br;
	139	struct net_device *dev = p->dev;
	140
	141	dev_set_promiscuity(dev, -1);
	142
4433f420	143	cancel_delayed_work(&p->carrier_check);
4433f420	144
1da177e4 LT	145	spin_lock_bh(&br->lock);
	146	br_stp_disable_port(p);
	147	spin_unlock_bh(&br->lock);
	148
	149	br_fdb_delete_by_port(br, p);
	150
	151	list_del_rcu(&p->list);
	152
b3f1be4b SH	153	rcu_assign_pointer(dev->br_port, NULL);
b3f1be4b 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) {
	164	br_sysfs_removeif(p);
	165	del_nbp(p);
	166	}
	167
	168	del_timer_sync(&br->gc_timer);
	169
	170	br_sysfs_delbr(br->dev);
	171	unregister_netdevice(br->dev);
	172	}
	173
	174	static struct net_device new_bridge_dev(const char name)
	175	{
	176	struct net_bridge *br;
	177	struct net_device *dev;
	178
	179	dev = alloc_netdev(sizeof(struct net_bridge), name,
	180	br_dev_setup);
	181
	182	if (!dev)
	183	return NULL;
	184
	185	br = netdev_priv(dev);
	186	br->dev = dev;
	187
	188	spin_lock_init(&br->lock);
	189	INIT_LIST_HEAD(&br->port_list);
	190	spin_lock_init(&br->hash_lock);
	191
	192	br->bridge_id.prio[0] = 0x80;
	193	br->bridge_id.prio[1] = 0x00;
	194	memset(br->bridge_id.addr, 0, ETH_ALEN);
	195
edb5e46f	196	br->feature_mask = dev->features;
1da177e4 LT	197	br->stp_enabled = 0;
	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
	221	inuse = kmalloc(BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long),
	222	GFP_KERNEL);
	223	if (!inuse)
	224	return -ENOMEM;
	225
	226	memset(inuse, 0, BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long));
	227	set_bit(0, inuse); /* zero is reserved */
	228	list_for_each_entry(p, &br->port_list, list) {
	229	set_bit(p->port_no, inuse);
	230	}
	231	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	232	kfree(inuse);
	233
	234	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
	235	}
	236
4433f420	237	/* called with RTNL but without bridge lock */
1da177e4	238	static struct net_bridge_port new_nbp(struct net_bridge br,
4433f420	239	struct net_device *dev)
1da177e4 LT	240	{
	241	int index;
	242	struct net_bridge_port *p;
	243
	244	index = find_portno(br);
	245	if (index < 0)
	246	return ERR_PTR(index);
	247
	248	p = kmalloc(sizeof(*p), GFP_KERNEL);
	249	if (p == NULL)
	250	return ERR_PTR(-ENOMEM);
	251
	252	memset(p, 0, sizeof(*p));
	253	p->br = br;
	254	dev_hold(dev);
	255	p->dev = dev;
4433f420	256	p->path_cost = port_cost(dev);
1da177e4	257	p->priority = 0x8000 >> BR_PORT_BITS;
1da177e4 LT	258	p->port_no = index;
	259	br_init_port(p);
	260	p->state = BR_STATE_DISABLED;
b3f1be4b	261	INIT_WORK(&p->carrier_check, port_carrier_check, dev);
1da177e4 LT	262	kobject_init(&p->kobj);
	263
	264	return p;
	265	}
	266
	267	int br_add_bridge(const char *name)
	268	{
	269	struct net_device *dev;
	270	int ret;
	271
	272	dev = new_bridge_dev(name);
	273	if (!dev)
	274	return -ENOMEM;
	275
	276	rtnl_lock();
	277	if (strchr(dev->name, '%')) {
	278	ret = dev_alloc_name(dev, dev->name);
	279	if (ret < 0)
	280	goto err1;
	281	}
	282
	283	ret = register_netdevice(dev);
	284	if (ret)
	285	goto err2;
	286
	287	/* network device kobject is not setup until
	288	* after rtnl_unlock does it's hotplug magic.
	289	* so hold reference to avoid race.
	290	*/
	291	dev_hold(dev);
	292	rtnl_unlock();
	293
	294	ret = br_sysfs_addbr(dev);
	295	dev_put(dev);
	296
	297	if (ret)
	298	unregister_netdev(dev);
	299	out:
	300	return ret;
	301
	302	err2:
	303	free_netdev(dev);
	304	err1:
	305	rtnl_unlock();
	306	goto out;
	307	}
	308
	309	int br_del_bridge(const char *name)
	310	{
	311	struct net_device *dev;
	312	int ret = 0;
	313
	314	rtnl_lock();
	315	dev = __dev_get_by_name(name);
	316	if (dev == NULL)
	317	ret = -ENXIO; /* Could not find device */
	318
	319	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
	320	/* Attempt to delete non bridge device! */
	321	ret = -EPERM;
	322	}
	323
	324	else if (dev->flags & IFF_UP) {
	325	/* Not shutdown yet. */
326	ret = -EBUSY;
327	}
328
329	else
330	del_br(netdev_priv(dev));
331
332	rtnl_unlock();
333	return ret;
334	}
335
46f25dff	336	/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1da177e4 LT	337	int br_min_mtu(const struct net_bridge *br)
	338	{
	339	const struct net_bridge_port *p;
	340	int mtu = 0;
	341
	342	ASSERT_RTNL();
	343
	344	if (list_empty(&br->port_list))
46f25dff	345	mtu = ETH_DATA_LEN;
1da177e4 LT	346	else {
	347	list_for_each_entry(p, &br->port_list, list) {
	348	if (!mtu \|\| p->dev->mtu < mtu)
	349	mtu = p->dev->mtu;
	350	}
	351	}
	352	return mtu;
	353	}
	354
81d35307 SH	355	/*
	356	* Recomputes features using slave's features
	357	*/
	358	void br_features_recompute(struct net_bridge *br)
	359	{
	360	struct net_bridge_port *p;
	361	unsigned long features, checksum;
	362
edb5e46f SH	363	features = br->feature_mask &~ NETIF_F_IP_CSUM;
edb5e46f SH	364	checksum = br->feature_mask & NETIF_F_IP_CSUM;
81d35307 SH	365
	366	list_for_each_entry(p, &br->port_list, list) {
	367	if (!(p->dev->features
	368	& (NETIF_F_IP_CSUM\|NETIF_F_NO_CSUM\|NETIF_F_HW_CSUM)))
	369	checksum = 0;
	370	features &= p->dev->features;
	371	}
	372
	373	br->dev->features = features \| checksum \| NETIF_F_LLTX;
	374	}
	375
1da177e4 LT	376	/* called with RTNL */
	377	int br_add_if(struct net_bridge br, struct net_device dev)
	378	{
	379	struct net_bridge_port *p;
	380	int err = 0;
	381
	382	if (dev->flags & IFF_LOOPBACK \|\| dev->type != ARPHRD_ETHER)
	383	return -EINVAL;
	384
	385	if (dev->hard_start_xmit == br_dev_xmit)
	386	return -ELOOP;
	387
	388	if (dev->br_port != NULL)
	389	return -EBUSY;
	390
4433f420	391	if (IS_ERR(p = new_nbp(br, dev)))
1da177e4 LT	392	return PTR_ERR(p);
	393
	394	if ((err = br_fdb_insert(br, p, dev->dev_addr)))
	395	destroy_nbp(p);
	396
	397	else if ((err = br_sysfs_addif(p)))
	398	del_nbp(p);
	399	else {
b3f1be4b	400	rcu_assign_pointer(dev->br_port, p);
1da177e4 LT	401	dev_set_promiscuity(dev, 1);
	402
	403	list_add_rcu(&p->list, &br->port_list);
	404
	405	spin_lock_bh(&br->lock);
	406	br_stp_recalculate_bridge_id(br);
133747e8	407	br_features_recompute(br);
1da177e4 LT	408	if ((br->dev->flags & IFF_UP)
	409	&& (dev->flags & IFF_UP) && netif_carrier_ok(dev))
	410	br_stp_enable_port(p);
	411	spin_unlock_bh(&br->lock);
	412
	413	dev_set_mtu(br->dev, br_min_mtu(br));
	414	}
	415
	416	return err;
	417	}
	418
	419	/* called with RTNL */
	420	int br_del_if(struct net_bridge br, struct net_device dev)
	421	{
	422	struct net_bridge_port *p = dev->br_port;
	423
	424	if (!p \|\| p->br != br)
	425	return -EINVAL;
	426
	427	br_sysfs_removeif(p);
	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();
	443	for (dev = dev_base; dev; dev = nxt) {
	444	nxt = dev->next;
	445	if (dev->priv_flags & IFF_EBRIDGE)
	446	del_br(dev->priv);
	447	}
	448	rtnl_unlock();
	449
	450	}