[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);

	br_multicast_del_port(p);

	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 list_head *head)
{
	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_queue(br->dev, head);
}

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);

	br_stp_timer_init(br);
	br_multicast_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);
	br_multicast_add_port(p);

	return p;
}

static struct device_type br_type = {
	.name	= "bridge",
};

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;
	}

	SET_NETDEV_DEVTYPE(dev, &br_type);

	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), NULL);

	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;

	/* Don't allow bridging non-ethernet like devices */
	if ((dev->flags & IFF_LOOPBACK) ||
	    dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN)
		return -EINVAL;

	/* No bridging of bridges */
	if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
		return -ELOOP;

	/* Device is already being bridged */
	if (dev->br_port != NULL)
		return -EBUSY;

	/* No bridging devices that dislike that (e.g. wireless) */
	if (dev->priv_flags & IFF_DONT_BRIDGE)
		return -EOPNOTSUPP;

	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);
	p = NULL; /* kobject_put frees */
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 __net_exit br_net_exit(struct net *net)
{
	struct net_device *dev;
	LIST_HEAD(list);

	rtnl_lock();
	for_each_netdev(net, dev)
		if (dev->priv_flags & IFF_EBRIDGE)
			del_br(netdev_priv(dev), &list);

	unregister_netdevice_many(&list);
	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
3fe2d7c7 HX	150	br_multicast_del_port(p);
3fe2d7c7 HX	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 */
8c56ba05	159	static void del_br(struct net_bridge br, struct list_head head)
1da177e4 LT	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);
8c56ba05	170	unregister_netdevice_queue(br->dev, head);
1da177e4 LT	171	}
1da177e4 LT	172
4aa678ba	173	static struct net_device new_bridge_dev(struct net net, const char *name)
1da177e4 LT	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)
1da177e4 LT	182	return NULL;
4aa678ba	183	dev_net_set(dev, net);
1da177e4 LT	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;
cee48541 SH	194
cee48541 SH	195	memcpy(br->group_addr, br_group_address, ETH_ALEN);
1da177e4	196
edb5e46f	197	br->feature_mask = dev->features;
9cde0708	198	br->stp_enabled = BR_NO_STP;
1da177e4 LT	199	br->designated_root = br->bridge_id;
	200	br->root_path_cost = 0;
	201	br->root_port = 0;
	202	br->bridge_max_age = br->max_age = 20 * HZ;
	203	br->bridge_hello_time = br->hello_time = 2 * HZ;
	204	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
	205	br->topology_change = 0;
	206	br->topology_change_detected = 0;
	207	br->ageing_time = 300 * HZ;
4adf0af6 SW	208
	209	br_netfilter_rtable_init(br);
	210
1da177e4	211	br_stp_timer_init(br);
3fe2d7c7	212	br_multicast_init(br);
1da177e4 LT	213
	214	return dev;
	215	}
	216
	217	/* find an available port number */
	218	static int find_portno(struct net_bridge *br)
	219	{
	220	int index;
	221	struct net_bridge_port *p;
	222	unsigned long *inuse;
	223
3b781fa1	224	inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
1da177e4 LT	225	GFP_KERNEL);
	226	if (!inuse)
	227	return -ENOMEM;
	228
1da177e4 LT	229	set_bit(0, inuse); /* zero is reserved */
	230	list_for_each_entry(p, &br->port_list, list) {
	231	set_bit(p->port_no, inuse);
	232	}
	233	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	234	kfree(inuse);
	235
	236	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
	237	}
	238
4433f420	239	/* called with RTNL but without bridge lock */
9d6f229f	240	static struct net_bridge_port new_nbp(struct net_bridge br,
4433f420	241	struct net_device *dev)
1da177e4 LT	242	{
	243	int index;
	244	struct net_bridge_port *p;
9d6f229f	245
1da177e4 LT	246	index = find_portno(br);
	247	if (index < 0)
	248	return ERR_PTR(index);
	249
cee48541	250	p = kzalloc(sizeof(*p), GFP_KERNEL);
1da177e4 LT	251	if (p == NULL)
	252	return ERR_PTR(-ENOMEM);
	253
1da177e4 LT	254	p->br = br;
	255	dev_hold(dev);
	256	p->dev = dev;
4433f420	257	p->path_cost = port_cost(dev);
9d6f229f	258	p->priority = 0x8000 >> BR_PORT_BITS;
1da177e4	259	p->port_no = index;
3982d3d2	260	p->flags = 0;
1da177e4 LT	261	br_init_port(p);
1da177e4 LT	262	p->state = BR_STATE_DISABLED;
d32439c0	263	br_stp_port_timer_init(p);
3fe2d7c7	264	br_multicast_add_port(p);
1da177e4 LT	265
	266	return p;
	267	}
	268
384912ed MH	269	static struct device_type br_type = {
	270	.name = "bridge",
	271	};
	272
4aa678ba	273	int br_add_bridge(struct net net, const char name)
1da177e4 LT	274	{
	275	struct net_device *dev;
	276	int ret;
	277
4aa678ba	278	dev = new_bridge_dev(net, name);
9d6f229f	279	if (!dev)
1da177e4 LT	280	return -ENOMEM;
	281
	282	rtnl_lock();
	283	if (strchr(dev->name, '%')) {
	284	ret = dev_alloc_name(dev, dev->name);
e340a90e PE	285	if (ret < 0)
e340a90e PE	286	goto out_free;
1da177e4 LT	287	}
1da177e4 LT	288
384912ed MH	289	SET_NETDEV_DEVTYPE(dev, &br_type);
384912ed MH	290
1da177e4	291	ret = register_netdevice(dev);
e340a90e PE	292	if (ret)
e340a90e PE	293	goto out_free;
1da177e4	294
1da177e4	295	ret = br_sysfs_addbr(dev);
ac05202e	296	if (ret)
36485707 JB	297	unregister_netdevice(dev);
36485707 JB	298	out:
1da177e4	299	rtnl_unlock();
ac05202e	300	return ret;
e340a90e PE	301
	302	out_free:
	303	free_netdev(dev);
	304	goto out;
1da177e4 LT	305	}
1da177e4 LT	306
4aa678ba	307	int br_del_bridge(struct net net, const char name)
1da177e4 LT	308	{
	309	struct net_device *dev;
	310	int ret = 0;
	311
	312	rtnl_lock();
4aa678ba	313	dev = __dev_get_by_name(net, name);
9d6f229f	314	if (dev == NULL)
1da177e4 LT	315	ret = -ENXIO; /* Could not find device */
	316
	317	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
	318	/* Attempt to delete non bridge device! */
	319	ret = -EPERM;
	320	}
	321
	322	else if (dev->flags & IFF_UP) {
	323	/* Not shutdown yet. */
	324	ret = -EBUSY;
9d6f229f	325	}
1da177e4	326
9d6f229f	327	else
8c56ba05	328	del_br(netdev_priv(dev), NULL);
1da177e4 LT	329
	330	rtnl_unlock();
	331	return ret;
	332	}
	333
46f25dff	334	/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1da177e4 LT	335	int br_min_mtu(const struct net_bridge *br)
	336	{
	337	const struct net_bridge_port *p;
	338	int mtu = 0;
	339
	340	ASSERT_RTNL();
	341
	342	if (list_empty(&br->port_list))
46f25dff	343	mtu = ETH_DATA_LEN;
1da177e4 LT	344	else {
	345	list_for_each_entry(p, &br->port_list, list) {
	346	if (!mtu \|\| p->dev->mtu < mtu)
	347	mtu = p->dev->mtu;
	348	}
	349	}
	350	return mtu;
	351	}
	352
81d35307 SH	353	/*
	354	* Recomputes features using slave's features
	355	*/
	356	void br_features_recompute(struct net_bridge *br)
	357	{
	358	struct net_bridge_port *p;
b63365a2	359	unsigned long features, mask;
81d35307	360
b63365a2 HX	361	features = mask = br->feature_mask;
	362	if (list_empty(&br->port_list))
	363	goto done;
	364
	365	features &= ~NETIF_F_ONE_FOR_ALL;
81d35307 SH	366
81d35307 SH	367	list_for_each_entry(p, &br->port_list, list) {
b63365a2 HX	368	features = netdev_increment_features(features,
b63365a2 HX	369	p->dev->features, mask);
81d35307 SH	370	}
81d35307 SH	371
b63365a2 HX	372	done:
b63365a2 HX	373	br->dev->features = netdev_fix_features(features, NULL);
81d35307 SH	374	}
81d35307 SH	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
1056bd51 SH	382	/* Don't allow bridging non-ethernet like devices */
	383	if ((dev->flags & IFF_LOOPBACK) \|\|
	384	dev->type != ARPHRD_ETHER \|\| dev->addr_len != ETH_ALEN)
1da177e4 LT	385	return -EINVAL;
1da177e4 LT	386
1056bd51	387	/* No bridging of bridges */
00829823	388	if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
1da177e4 LT	389	return -ELOOP;
1da177e4 LT	390
1056bd51	391	/* Device is already being bridged */
1da177e4 LT	392	if (dev->br_port != NULL)
	393	return -EBUSY;
	394
ad4bb6f8 JB	395	/* No bridging devices that dislike that (e.g. wireless) */
	396	if (dev->priv_flags & IFF_DONT_BRIDGE)
	397	return -EOPNOTSUPP;
	398
bab1deea SH	399	p = new_nbp(br, dev);
bab1deea SH	400	if (IS_ERR(p))
1da177e4 LT	401	return PTR_ERR(p);
1da177e4 LT	402
bc3f9076 WC	403	err = dev_set_promiscuity(dev, 1);
	404	if (err)
	405	goto put_back;
	406
e32cc736 GKH	407	err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
e32cc736 GKH	408	SYSFS_BRIDGE_PORT_ATTR);
bab1deea SH	409	if (err)
bab1deea SH	410	goto err0;
1da177e4	411
9d6f229f	412	err = br_fdb_insert(br, p, dev->dev_addr);
bab1deea SH	413	if (err)
bab1deea SH	414	goto err1;
1da177e4	415
bab1deea SH	416	err = br_sysfs_addif(p);
	417	if (err)
	418	goto err2;
1da177e4	419
bab1deea	420	rcu_assign_pointer(dev->br_port, p);
0187bdfb	421	dev_disable_lro(dev);
bab1deea SH	422
	423	list_add_rcu(&p->list, &br->port_list);
	424
	425	spin_lock_bh(&br->lock);
	426	br_stp_recalculate_bridge_id(br);
	427	br_features_recompute(br);
de79059e AS	428
	429	if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
	430	(br->dev->flags & IFF_UP))
	431	br_stp_enable_port(p);
bab1deea SH	432	spin_unlock_bh(&br->lock);
bab1deea SH	433
b86c4503 SH	434	br_ifinfo_notify(RTM_NEWLINK, p);
b86c4503 SH	435
bab1deea	436	dev_set_mtu(br->dev, br_min_mtu(br));
269def7c	437
bab1deea	438	kobject_uevent(&p->kobj, KOBJ_ADD);
1da177e4	439
bab1deea SH	440	return 0;
bab1deea SH	441	err2:
1a620698	442	br_fdb_delete_by_port(br, p, 1);
bab1deea	443	err1:
c587aea9	444	kobject_put(&p->kobj);
30df94f8	445	p = NULL; /* kobject_put frees */
bab1deea	446	err0:
bc3f9076	447	dev_set_promiscuity(dev, -1);
43af8532 VL	448	put_back:
43af8532 VL	449	dev_put(dev);
bc3f9076	450	kfree(p);
1da177e4 LT	451	return err;
	452	}
	453
	454	/* called with RTNL */
	455	int br_del_if(struct net_bridge br, struct net_device dev)
	456	{
	457	struct net_bridge_port *p = dev->br_port;
9d6f229f YH	458
9d6f229f YH	459	if (!p \|\| p->br != br)
1da177e4 LT	460	return -EINVAL;
1da177e4 LT	461
1da177e4 LT	462	del_nbp(p);
	463
	464	spin_lock_bh(&br->lock);
	465	br_stp_recalculate_bridge_id(br);
81d35307	466	br_features_recompute(br);
1da177e4 LT	467	spin_unlock_bh(&br->lock);
	468
	469	return 0;
	470	}
	471
2c8c1e72	472	void __net_exit br_net_exit(struct net *net)
1da177e4	473	{
ab1b2046	474	struct net_device *dev;
8c56ba05	475	LIST_HEAD(list);
1da177e4 LT	476
1da177e4 LT	477	rtnl_lock();
8c56ba05 ED	478	for_each_netdev(net, dev)
	479	if (dev->priv_flags & IFF_EBRIDGE)
	480	del_br(netdev_priv(dev), &list);
	481
	482	unregister_netdevice_many(&list);
1da177e4 LT	483	rtnl_unlock();
	484
	485	}