[net-next-2.6.git] / net / bridge / br_if.c

/*
 *	Userspace interface
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<buytenh@gnu.org>
 *
 *	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(struct net *net, 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;
	dev_net_set(dev, net);

	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;

	br_netfilter_rtable_init(br);

	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;
	p->flags = 0;
	br_init_port(p);
	p->state = BR_STATE_DISABLED;
	br_stp_port_timer_init(p);

	return p;
}

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

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

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

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

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

out_free:
	free_netdev(dev);
	goto out;
}

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

	rtnl_lock();
	dev = __dev_get_by_name(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, mask;

	features = mask = br->feature_mask;
	if (list_empty(&br->port_list))
		goto done;

	features &= ~NETIF_F_ONE_FOR_ALL;

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

done:
	br->dev->features = netdev_fix_features(features, NULL);
}

/* 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->netdev_ops->ndo_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 = dev_set_promiscuity(dev, 1);
	if (err)
		goto put_back;

	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_disable_lro(dev);

	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_put(&p->kobj);
err0:
	dev_set_promiscuity(dev, -1);
put_back:
	dev_put(dev);
	kfree(p);
	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 br_net_exit(struct net *net)
{
	struct net_device *dev;

	rtnl_lock();
restart:
	for_each_netdev(net, dev) {
		if (dev->priv_flags & IFF_EBRIDGE) {
			del_br(netdev_priv(dev));
			goto restart;
		}
	}
	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	*
1da177e4 LT	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* as published by the Free Software Foundation; either version
	11	* 2 of the License, or (at your option) any later version.
	12	*/
	13
	14	#include <linux/kernel.h>
	15	#include <linux/netdevice.h>
	16	#include <linux/ethtool.h>
	17	#include <linux/if_arp.h>
	18	#include <linux/module.h>
	19	#include <linux/init.h>
	20	#include <linux/rtnetlink.h>
46f25dff	21	#include <linux/if_ether.h>
1da177e4 LT	22	#include <net/sock.h>
	23
	24	#include "br_private.h"
	25
	26	/*
	27	* Determine initial path cost based on speed.
	28	* using recommendations from 802.1d standard
	29	*
61a44b9c	30	* Since driver might sleep need to not be holding any locks.
1da177e4	31	*/
4433f420	32	static int port_cost(struct net_device *dev)
1da177e4	33	{
b4a488d1 SH	34	if (dev->ethtool_ops && dev->ethtool_ops->get_settings) {
	35	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET, };
	36
	37	if (!dev->ethtool_ops->get_settings(dev, &ecmd)) {
61a44b9c	38	switch(ecmd.speed) {
61a44b9c MW	39	case SPEED_10000:
61a44b9c MW	40	return 2;
b4a488d1 SH	41	case SPEED_1000:
	42	return 4;
	43	case SPEED_100:
	44	return 19;
61a44b9c MW	45	case SPEED_10:
	46	return 100;
	47	}
1da177e4 LT	48	}
	49	}
	50
	51	/* Old silly heuristics based on name */
	52	if (!strncmp(dev->name, "lec", 3))
	53	return 7;
	54
	55	if (!strncmp(dev->name, "plip", 4))
	56	return 2500;
	57
	58	return 100; /* assume old 10Mbps */
	59	}
	60
4433f420 SH	61
	62	/*
	63	* Check for port carrier transistions.
	64	* Called from work queue to allow for calling functions that
	65	* might sleep (such as speed check), and to debounce.
	66	*/
269def7c	67	void br_port_carrier_check(struct net_bridge_port *p)
4433f420	68	{
269def7c SH	69	struct net_device *dev = p->dev;
269def7c SH	70	struct net_bridge *br = p->br;
6e86b890 SH	71
	72	if (netif_carrier_ok(dev))
	73	p->path_cost = port_cost(dev);
	74
269def7c	75	if (netif_running(br->dev)) {
6e86b890 SH	76	spin_lock_bh(&br->lock);
	77	if (netif_carrier_ok(dev)) {
	78	if (p->state == BR_STATE_DISABLED)
	79	br_stp_enable_port(p);
	80	} else {
	81	if (p->state != BR_STATE_DISABLED)
	82	br_stp_disable_port(p);
4433f420	83	}
6e86b890	84	spin_unlock_bh(&br->lock);
4433f420	85	}
4433f420 SH	86	}
4433f420 SH	87
bab1deea SH	88	static void release_nbp(struct kobject *kobj)
	89	{
	90	struct net_bridge_port *p
	91	= container_of(kobj, struct net_bridge_port, kobj);
	92	kfree(p);
	93	}
	94
	95	static struct kobj_type brport_ktype = {
	96	#ifdef CONFIG_SYSFS
	97	.sysfs_ops = &brport_sysfs_ops,
	98	#endif
	99	.release = release_nbp,
	100	};
	101
1da177e4 LT	102	static void destroy_nbp(struct net_bridge_port *p)
	103	{
	104	struct net_device *dev = p->dev;
	105
1da177e4 LT	106	p->br = NULL;
	107	p->dev = NULL;
	108	dev_put(dev);
	109
bab1deea	110	kobject_put(&p->kobj);
1da177e4 LT	111	}
	112
	113	static void destroy_nbp_rcu(struct rcu_head *head)
	114	{
	115	struct net_bridge_port *p =
	116	container_of(head, struct net_bridge_port, rcu);
	117	destroy_nbp(p);
	118	}
	119
3f4cfc2d SH	120	/* Delete port(interface) from bridge is done in two steps.
	121	* via RCU. First step, marks device as down. That deletes
	122	* all the timers and stops new packets from flowing through.
	123	*
	124	* Final cleanup doesn't occur until after all CPU's finished
	125	* processing packets.
	126	*
	127	* Protected from multiple admin operations by RTNL mutex
	128	*/
1da177e4 LT	129	static void del_nbp(struct net_bridge_port *p)
	130	{
	131	struct net_bridge *br = p->br;
	132	struct net_device *dev = p->dev;
	133
43b98c4a	134	sysfs_remove_link(br->ifobj, dev->name);
bab1deea	135
1da177e4 LT	136	dev_set_promiscuity(dev, -1);
	137
	138	spin_lock_bh(&br->lock);
	139	br_stp_disable_port(p);
	140	spin_unlock_bh(&br->lock);
	141
b86c4503 SH	142	br_ifinfo_notify(RTM_DELLINK, p);
b86c4503 SH	143
1a620698	144	br_fdb_delete_by_port(br, p, 1);
1da177e4 LT	145
	146	list_del_rcu(&p->list);
	147
b3f1be4b SH	148	rcu_assign_pointer(dev->br_port, NULL);
b3f1be4b SH	149
125a12cc	150	kobject_uevent(&p->kobj, KOBJ_REMOVE);
bab1deea SH	151	kobject_del(&p->kobj);
bab1deea SH	152
1da177e4 LT	153	call_rcu(&p->rcu, destroy_nbp_rcu);
	154	}
	155
	156	/* called with RTNL */
	157	static void del_br(struct net_bridge *br)
	158	{
	159	struct net_bridge_port p, n;
	160
	161	list_for_each_entry_safe(p, n, &br->port_list, list) {
1da177e4 LT	162	del_nbp(p);
	163	}
	164
	165	del_timer_sync(&br->gc_timer);
	166
	167	br_sysfs_delbr(br->dev);
9d6f229f	168	unregister_netdevice(br->dev);
1da177e4 LT	169	}
1da177e4 LT	170
4aa678ba	171	static struct net_device new_bridge_dev(struct net net, const char *name)
1da177e4 LT	172	{
	173	struct net_bridge *br;
	174	struct net_device *dev;
	175
	176	dev = alloc_netdev(sizeof(struct net_bridge), name,
	177	br_dev_setup);
9d6f229f	178
1da177e4 LT	179	if (!dev)
1da177e4 LT	180	return NULL;
4aa678ba	181	dev_net_set(dev, net);
1da177e4 LT	182
	183	br = netdev_priv(dev);
	184	br->dev = dev;
	185
	186	spin_lock_init(&br->lock);
	187	INIT_LIST_HEAD(&br->port_list);
	188	spin_lock_init(&br->hash_lock);
	189
	190	br->bridge_id.prio[0] = 0x80;
	191	br->bridge_id.prio[1] = 0x00;
cee48541 SH	192
cee48541 SH	193	memcpy(br->group_addr, br_group_address, ETH_ALEN);
1da177e4	194
edb5e46f	195	br->feature_mask = dev->features;
9cde0708	196	br->stp_enabled = BR_NO_STP;
1da177e4 LT	197	br->designated_root = br->bridge_id;
	198	br->root_path_cost = 0;
	199	br->root_port = 0;
	200	br->bridge_max_age = br->max_age = 20 * HZ;
	201	br->bridge_hello_time = br->hello_time = 2 * HZ;
	202	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
	203	br->topology_change = 0;
	204	br->topology_change_detected = 0;
	205	br->ageing_time = 300 * HZ;
4adf0af6 SW	206
	207	br_netfilter_rtable_init(br);
	208
1da177e4 LT	209	INIT_LIST_HEAD(&br->age_list);
	210
	211	br_stp_timer_init(br);
	212
	213	return dev;
	214	}
	215
	216	/* find an available port number */
	217	static int find_portno(struct net_bridge *br)
	218	{
	219	int index;
	220	struct net_bridge_port *p;
	221	unsigned long *inuse;
	222
3b781fa1	223	inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
1da177e4 LT	224	GFP_KERNEL);
	225	if (!inuse)
	226	return -ENOMEM;
	227
1da177e4 LT	228	set_bit(0, inuse); /* zero is reserved */
	229	list_for_each_entry(p, &br->port_list, list) {
	230	set_bit(p->port_no, inuse);
	231	}
	232	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	233	kfree(inuse);
	234
	235	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
	236	}
	237
4433f420	238	/* called with RTNL but without bridge lock */
9d6f229f	239	static struct net_bridge_port new_nbp(struct net_bridge br,
4433f420	240	struct net_device *dev)
1da177e4 LT	241	{
	242	int index;
	243	struct net_bridge_port *p;
9d6f229f	244
1da177e4 LT	245	index = find_portno(br);
	246	if (index < 0)
	247	return ERR_PTR(index);
	248
cee48541	249	p = kzalloc(sizeof(*p), GFP_KERNEL);
1da177e4 LT	250	if (p == NULL)
	251	return ERR_PTR(-ENOMEM);
	252
1da177e4 LT	253	p->br = br;
	254	dev_hold(dev);
	255	p->dev = dev;
4433f420	256	p->path_cost = port_cost(dev);
9d6f229f	257	p->priority = 0x8000 >> BR_PORT_BITS;
1da177e4	258	p->port_no = index;
3982d3d2	259	p->flags = 0;
1da177e4 LT	260	br_init_port(p);
1da177e4 LT	261	p->state = BR_STATE_DISABLED;
d32439c0	262	br_stp_port_timer_init(p);
1da177e4 LT	263
	264	return p;
	265	}
	266
4aa678ba	267	int br_add_bridge(struct net net, const char name)
1da177e4 LT	268	{
	269	struct net_device *dev;
	270	int ret;
	271
4aa678ba	272	dev = new_bridge_dev(net, name);
9d6f229f	273	if (!dev)
1da177e4 LT	274	return -ENOMEM;
	275
	276	rtnl_lock();
	277	if (strchr(dev->name, '%')) {
	278	ret = dev_alloc_name(dev, dev->name);
e340a90e PE	279	if (ret < 0)
e340a90e PE	280	goto out_free;
1da177e4 LT	281	}
	282
	283	ret = register_netdevice(dev);
e340a90e PE	284	if (ret)
e340a90e PE	285	goto out_free;
1da177e4	286
1da177e4	287	ret = br_sysfs_addbr(dev);
ac05202e	288	if (ret)
36485707 JB	289	unregister_netdevice(dev);
36485707 JB	290	out:
1da177e4	291	rtnl_unlock();
ac05202e	292	return ret;
e340a90e PE	293
	294	out_free:
	295	free_netdev(dev);
	296	goto out;
1da177e4 LT	297	}
1da177e4 LT	298
4aa678ba	299	int br_del_bridge(struct net net, const char name)
1da177e4 LT	300	{
	301	struct net_device *dev;
	302	int ret = 0;
	303
	304	rtnl_lock();
4aa678ba	305	dev = __dev_get_by_name(net, name);
9d6f229f	306	if (dev == NULL)
1da177e4 LT	307	ret = -ENXIO; /* Could not find device */
	308
	309	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
	310	/* Attempt to delete non bridge device! */
	311	ret = -EPERM;
	312	}
	313
	314	else if (dev->flags & IFF_UP) {
	315	/* Not shutdown yet. */
	316	ret = -EBUSY;
9d6f229f	317	}
1da177e4	318
9d6f229f	319	else
1da177e4 LT	320	del_br(netdev_priv(dev));
	321
	322	rtnl_unlock();
	323	return ret;
	324	}
	325
46f25dff	326	/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1da177e4 LT	327	int br_min_mtu(const struct net_bridge *br)
	328	{
	329	const struct net_bridge_port *p;
	330	int mtu = 0;
	331
	332	ASSERT_RTNL();
	333
	334	if (list_empty(&br->port_list))
46f25dff	335	mtu = ETH_DATA_LEN;
1da177e4 LT	336	else {
	337	list_for_each_entry(p, &br->port_list, list) {
	338	if (!mtu \|\| p->dev->mtu < mtu)
	339	mtu = p->dev->mtu;
	340	}
	341	}
	342	return mtu;
	343	}
	344
81d35307 SH	345	/*
	346	* Recomputes features using slave's features
	347	*/
	348	void br_features_recompute(struct net_bridge *br)
	349	{
	350	struct net_bridge_port *p;
b63365a2	351	unsigned long features, mask;
81d35307	352
b63365a2 HX	353	features = mask = br->feature_mask;
	354	if (list_empty(&br->port_list))
	355	goto done;
	356
	357	features &= ~NETIF_F_ONE_FOR_ALL;
81d35307 SH	358
81d35307 SH	359	list_for_each_entry(p, &br->port_list, list) {
b63365a2 HX	360	features = netdev_increment_features(features,
b63365a2 HX	361	p->dev->features, mask);
81d35307 SH	362	}
81d35307 SH	363
b63365a2 HX	364	done:
b63365a2 HX	365	br->dev->features = netdev_fix_features(features, NULL);
81d35307 SH	366	}
81d35307 SH	367
1da177e4 LT	368	/* called with RTNL */
	369	int br_add_if(struct net_bridge br, struct net_device dev)
	370	{
	371	struct net_bridge_port *p;
	372	int err = 0;
	373
	374	if (dev->flags & IFF_LOOPBACK \|\| dev->type != ARPHRD_ETHER)
	375	return -EINVAL;
	376
00829823	377	if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
1da177e4 LT	378	return -ELOOP;
	379
	380	if (dev->br_port != NULL)
	381	return -EBUSY;
	382
bab1deea SH	383	p = new_nbp(br, dev);
bab1deea SH	384	if (IS_ERR(p))
1da177e4 LT	385	return PTR_ERR(p);
1da177e4 LT	386
bc3f9076 WC	387	err = dev_set_promiscuity(dev, 1);
	388	if (err)
	389	goto put_back;
	390
e32cc736 GKH	391	err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
e32cc736 GKH	392	SYSFS_BRIDGE_PORT_ATTR);
bab1deea SH	393	if (err)
bab1deea SH	394	goto err0;
1da177e4	395
9d6f229f	396	err = br_fdb_insert(br, p, dev->dev_addr);
bab1deea SH	397	if (err)
bab1deea SH	398	goto err1;
1da177e4	399
bab1deea SH	400	err = br_sysfs_addif(p);
	401	if (err)
	402	goto err2;
1da177e4	403
bab1deea	404	rcu_assign_pointer(dev->br_port, p);
0187bdfb	405	dev_disable_lro(dev);
bab1deea SH	406
	407	list_add_rcu(&p->list, &br->port_list);
	408
	409	spin_lock_bh(&br->lock);
	410	br_stp_recalculate_bridge_id(br);
	411	br_features_recompute(br);
de79059e AS	412
	413	if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
	414	(br->dev->flags & IFF_UP))
	415	br_stp_enable_port(p);
bab1deea SH	416	spin_unlock_bh(&br->lock);
bab1deea SH	417
b86c4503 SH	418	br_ifinfo_notify(RTM_NEWLINK, p);
b86c4503 SH	419
bab1deea	420	dev_set_mtu(br->dev, br_min_mtu(br));
269def7c	421
bab1deea	422	kobject_uevent(&p->kobj, KOBJ_ADD);
1da177e4	423
bab1deea SH	424	return 0;
bab1deea SH	425	err2:
1a620698	426	br_fdb_delete_by_port(br, p, 1);
bab1deea	427	err1:
c587aea9	428	kobject_put(&p->kobj);
bab1deea	429	err0:
bc3f9076	430	dev_set_promiscuity(dev, -1);
43af8532 VL	431	put_back:
43af8532 VL	432	dev_put(dev);
bc3f9076	433	kfree(p);
1da177e4 LT	434	return err;
	435	}
	436
	437	/* called with RTNL */
	438	int br_del_if(struct net_bridge br, struct net_device dev)
	439	{
	440	struct net_bridge_port *p = dev->br_port;
9d6f229f YH	441
9d6f229f YH	442	if (!p \|\| p->br != br)
1da177e4 LT	443	return -EINVAL;
1da177e4 LT	444
1da177e4 LT	445	del_nbp(p);
	446
	447	spin_lock_bh(&br->lock);
	448	br_stp_recalculate_bridge_id(br);
81d35307	449	br_features_recompute(br);
1da177e4 LT	450	spin_unlock_bh(&br->lock);
	451
	452	return 0;
	453	}
	454
712d6954	455	void br_net_exit(struct net *net)
1da177e4	456	{
ab1b2046	457	struct net_device *dev;
1da177e4 LT	458
1da177e4 LT	459	rtnl_lock();
ab1b2046	460	restart:
712d6954	461	for_each_netdev(net, dev) {
ab1b2046	462	if (dev->priv_flags & IFF_EBRIDGE) {
524ad0a7	463	del_br(netdev_priv(dev));
ab1b2046 PM	464	goto restart;
	465	}
	466	}
1da177e4 LT	467	rtnl_unlock();
	468
	469	}