[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/netpoll.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 <linux/slab.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, p->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);

	br_netpoll_disable(br, dev);
	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);
	}

	br_netpoll_cleanup(br->dev);

	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;

	br->stats = alloc_percpu(struct br_cpu_netstats);
	if (!br->stats) {
		free_netdev(dev);
		return NULL;
	}

	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);

	br_netpoll_enable(br, dev);

	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>
c06ee961	16	#include <linux/netpoll.h>
1da177e4 LT	17	#include <linux/ethtool.h>
	18	#include <linux/if_arp.h>
	19	#include <linux/module.h>
	20	#include <linux/init.h>
	21	#include <linux/rtnetlink.h>
46f25dff	22	#include <linux/if_ether.h>
5a0e3ad6	23	#include <linux/slab.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
b3bcb72e	136	sysfs_remove_link(br->ifobj, p->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
3fe2d7c7 HX	152	br_multicast_del_port(p);
3fe2d7c7 HX	153
125a12cc	154	kobject_uevent(&p->kobj, KOBJ_REMOVE);
bab1deea SH	155	kobject_del(&p->kobj);
bab1deea SH	156
cfb478da	157	br_netpoll_disable(br, dev);
1da177e4 LT	158	call_rcu(&p->rcu, destroy_nbp_rcu);
	159	}
	160
	161	/* called with RTNL */
8c56ba05	162	static void del_br(struct net_bridge br, struct list_head head)
1da177e4 LT	163	{
	164	struct net_bridge_port p, n;
	165
	166	list_for_each_entry_safe(p, n, &br->port_list, list) {
1da177e4 LT	167	del_nbp(p);
	168	}
	169
c06ee961 WC	170	br_netpoll_cleanup(br->dev);
c06ee961 WC	171
1da177e4 LT	172	del_timer_sync(&br->gc_timer);
	173
	174	br_sysfs_delbr(br->dev);
8c56ba05	175	unregister_netdevice_queue(br->dev, head);
1da177e4 LT	176	}
1da177e4 LT	177
4aa678ba	178	static struct net_device new_bridge_dev(struct net net, const char *name)
1da177e4 LT	179	{
	180	struct net_bridge *br;
	181	struct net_device *dev;
	182
	183	dev = alloc_netdev(sizeof(struct net_bridge), name,
	184	br_dev_setup);
9d6f229f	185
1da177e4 LT	186	if (!dev)
1da177e4 LT	187	return NULL;
4aa678ba	188	dev_net_set(dev, net);
1da177e4 LT	189
	190	br = netdev_priv(dev);
	191	br->dev = dev;
	192
14bb4789	193	br->stats = alloc_percpu(struct br_cpu_netstats);
	194	if (!br->stats) {
	195	free_netdev(dev);
	196	return NULL;
	197	}
	198
1da177e4 LT	199	spin_lock_init(&br->lock);
	200	INIT_LIST_HEAD(&br->port_list);
	201	spin_lock_init(&br->hash_lock);
	202
	203	br->bridge_id.prio[0] = 0x80;
	204	br->bridge_id.prio[1] = 0x00;
cee48541 SH	205
cee48541 SH	206	memcpy(br->group_addr, br_group_address, ETH_ALEN);
1da177e4	207
edb5e46f	208	br->feature_mask = dev->features;
9cde0708	209	br->stp_enabled = BR_NO_STP;
1da177e4 LT	210	br->designated_root = br->bridge_id;
	211	br->root_path_cost = 0;
	212	br->root_port = 0;
	213	br->bridge_max_age = br->max_age = 20 * HZ;
	214	br->bridge_hello_time = br->hello_time = 2 * HZ;
	215	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
	216	br->topology_change = 0;
	217	br->topology_change_detected = 0;
	218	br->ageing_time = 300 * HZ;
4adf0af6 SW	219
	220	br_netfilter_rtable_init(br);
	221
1da177e4	222	br_stp_timer_init(br);
3fe2d7c7	223	br_multicast_init(br);
1da177e4 LT	224
	225	return dev;
	226	}
	227
	228	/* find an available port number */
	229	static int find_portno(struct net_bridge *br)
	230	{
	231	int index;
	232	struct net_bridge_port *p;
	233	unsigned long *inuse;
	234
3b781fa1	235	inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
1da177e4 LT	236	GFP_KERNEL);
	237	if (!inuse)
	238	return -ENOMEM;
	239
1da177e4 LT	240	set_bit(0, inuse); /* zero is reserved */
	241	list_for_each_entry(p, &br->port_list, list) {
	242	set_bit(p->port_no, inuse);
	243	}
	244	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	245	kfree(inuse);
	246
	247	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
	248	}
	249
4433f420	250	/* called with RTNL but without bridge lock */
9d6f229f	251	static struct net_bridge_port new_nbp(struct net_bridge br,
4433f420	252	struct net_device *dev)
1da177e4 LT	253	{
	254	int index;
	255	struct net_bridge_port *p;
9d6f229f	256
1da177e4 LT	257	index = find_portno(br);
	258	if (index < 0)
	259	return ERR_PTR(index);
	260
cee48541	261	p = kzalloc(sizeof(*p), GFP_KERNEL);
1da177e4 LT	262	if (p == NULL)
	263	return ERR_PTR(-ENOMEM);
	264
1da177e4 LT	265	p->br = br;
	266	dev_hold(dev);
	267	p->dev = dev;
4433f420	268	p->path_cost = port_cost(dev);
9d6f229f	269	p->priority = 0x8000 >> BR_PORT_BITS;
1da177e4	270	p->port_no = index;
3982d3d2	271	p->flags = 0;
1da177e4 LT	272	br_init_port(p);
1da177e4 LT	273	p->state = BR_STATE_DISABLED;
d32439c0	274	br_stp_port_timer_init(p);
3fe2d7c7	275	br_multicast_add_port(p);
1da177e4 LT	276
	277	return p;
	278	}
	279
384912ed MH	280	static struct device_type br_type = {
	281	.name = "bridge",
	282	};
	283
4aa678ba	284	int br_add_bridge(struct net net, const char name)
1da177e4 LT	285	{
	286	struct net_device *dev;
	287	int ret;
	288
4aa678ba	289	dev = new_bridge_dev(net, name);
9d6f229f	290	if (!dev)
1da177e4 LT	291	return -ENOMEM;
	292
	293	rtnl_lock();
	294	if (strchr(dev->name, '%')) {
	295	ret = dev_alloc_name(dev, dev->name);
e340a90e PE	296	if (ret < 0)
e340a90e PE	297	goto out_free;
1da177e4 LT	298	}
1da177e4 LT	299
384912ed MH	300	SET_NETDEV_DEVTYPE(dev, &br_type);
384912ed MH	301
1da177e4	302	ret = register_netdevice(dev);
e340a90e PE	303	if (ret)
e340a90e PE	304	goto out_free;
1da177e4	305
1da177e4	306	ret = br_sysfs_addbr(dev);
ac05202e	307	if (ret)
36485707 JB	308	unregister_netdevice(dev);
36485707 JB	309	out:
1da177e4	310	rtnl_unlock();
ac05202e	311	return ret;
e340a90e PE	312
	313	out_free:
	314	free_netdev(dev);
	315	goto out;
1da177e4 LT	316	}
1da177e4 LT	317
4aa678ba	318	int br_del_bridge(struct net net, const char name)
1da177e4 LT	319	{
	320	struct net_device *dev;
	321	int ret = 0;
	322
	323	rtnl_lock();
4aa678ba	324	dev = __dev_get_by_name(net, name);
9d6f229f	325	if (dev == NULL)
1da177e4 LT	326	ret = -ENXIO; /* Could not find device */
	327
	328	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
	329	/* Attempt to delete non bridge device! */
	330	ret = -EPERM;
	331	}
	332
	333	else if (dev->flags & IFF_UP) {
	334	/* Not shutdown yet. */
	335	ret = -EBUSY;
9d6f229f	336	}
1da177e4	337
9d6f229f	338	else
8c56ba05	339	del_br(netdev_priv(dev), NULL);
1da177e4 LT	340
	341	rtnl_unlock();
	342	return ret;
	343	}
	344
46f25dff	345	/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1da177e4 LT	346	int br_min_mtu(const struct net_bridge *br)
	347	{
	348	const struct net_bridge_port *p;
	349	int mtu = 0;
	350
	351	ASSERT_RTNL();
	352
	353	if (list_empty(&br->port_list))
46f25dff	354	mtu = ETH_DATA_LEN;
1da177e4 LT	355	else {
	356	list_for_each_entry(p, &br->port_list, list) {
	357	if (!mtu \|\| p->dev->mtu < mtu)
	358	mtu = p->dev->mtu;
	359	}
	360	}
	361	return mtu;
	362	}
	363
81d35307 SH	364	/*
	365	* Recomputes features using slave's features
	366	*/
	367	void br_features_recompute(struct net_bridge *br)
	368	{
	369	struct net_bridge_port *p;
b63365a2	370	unsigned long features, mask;
81d35307	371
b63365a2 HX	372	features = mask = br->feature_mask;
	373	if (list_empty(&br->port_list))
	374	goto done;
	375
	376	features &= ~NETIF_F_ONE_FOR_ALL;
81d35307 SH	377
81d35307 SH	378	list_for_each_entry(p, &br->port_list, list) {
b63365a2 HX	379	features = netdev_increment_features(features,
b63365a2 HX	380	p->dev->features, mask);
81d35307 SH	381	}
81d35307 SH	382
b63365a2 HX	383	done:
b63365a2 HX	384	br->dev->features = netdev_fix_features(features, NULL);
81d35307 SH	385	}
81d35307 SH	386
1da177e4 LT	387	/* called with RTNL */
	388	int br_add_if(struct net_bridge br, struct net_device dev)
	389	{
	390	struct net_bridge_port *p;
	391	int err = 0;
	392
1056bd51 SH	393	/* Don't allow bridging non-ethernet like devices */
	394	if ((dev->flags & IFF_LOOPBACK) \|\|
	395	dev->type != ARPHRD_ETHER \|\| dev->addr_len != ETH_ALEN)
1da177e4 LT	396	return -EINVAL;
1da177e4 LT	397
1056bd51	398	/* No bridging of bridges */
00829823	399	if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
1da177e4 LT	400	return -ELOOP;
1da177e4 LT	401
1056bd51	402	/* Device is already being bridged */
1da177e4 LT	403	if (dev->br_port != NULL)
	404	return -EBUSY;
	405
ad4bb6f8 JB	406	/* No bridging devices that dislike that (e.g. wireless) */
	407	if (dev->priv_flags & IFF_DONT_BRIDGE)
	408	return -EOPNOTSUPP;
	409
bab1deea SH	410	p = new_nbp(br, dev);
bab1deea SH	411	if (IS_ERR(p))
1da177e4 LT	412	return PTR_ERR(p);
1da177e4 LT	413
bc3f9076 WC	414	err = dev_set_promiscuity(dev, 1);
	415	if (err)
	416	goto put_back;
	417
e32cc736 GKH	418	err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
e32cc736 GKH	419	SYSFS_BRIDGE_PORT_ATTR);
bab1deea SH	420	if (err)
bab1deea SH	421	goto err0;
1da177e4	422
9d6f229f	423	err = br_fdb_insert(br, p, dev->dev_addr);
bab1deea SH	424	if (err)
bab1deea SH	425	goto err1;
1da177e4	426
bab1deea SH	427	err = br_sysfs_addif(p);
	428	if (err)
	429	goto err2;
1da177e4	430
bab1deea	431	rcu_assign_pointer(dev->br_port, p);
0187bdfb	432	dev_disable_lro(dev);
bab1deea SH	433
	434	list_add_rcu(&p->list, &br->port_list);
	435
	436	spin_lock_bh(&br->lock);
	437	br_stp_recalculate_bridge_id(br);
	438	br_features_recompute(br);
de79059e AS	439
	440	if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
	441	(br->dev->flags & IFF_UP))
	442	br_stp_enable_port(p);
bab1deea SH	443	spin_unlock_bh(&br->lock);
bab1deea SH	444
b86c4503 SH	445	br_ifinfo_notify(RTM_NEWLINK, p);
b86c4503 SH	446
bab1deea	447	dev_set_mtu(br->dev, br_min_mtu(br));
269def7c	448
bab1deea	449	kobject_uevent(&p->kobj, KOBJ_ADD);
1da177e4	450
cfb478da	451	br_netpoll_enable(br, dev);
c06ee961	452
bab1deea SH	453	return 0;
bab1deea SH	454	err2:
1a620698	455	br_fdb_delete_by_port(br, p, 1);
bab1deea	456	err1:
c587aea9	457	kobject_put(&p->kobj);
30df94f8	458	p = NULL; /* kobject_put frees */
bab1deea	459	err0:
bc3f9076	460	dev_set_promiscuity(dev, -1);
43af8532 VL	461	put_back:
43af8532 VL	462	dev_put(dev);
bc3f9076	463	kfree(p);
1da177e4 LT	464	return err;
	465	}
	466
	467	/* called with RTNL */
	468	int br_del_if(struct net_bridge br, struct net_device dev)
	469	{
	470	struct net_bridge_port *p = dev->br_port;
9d6f229f YH	471
9d6f229f YH	472	if (!p \|\| p->br != br)
1da177e4 LT	473	return -EINVAL;
1da177e4 LT	474
1da177e4 LT	475	del_nbp(p);
	476
	477	spin_lock_bh(&br->lock);
	478	br_stp_recalculate_bridge_id(br);
81d35307	479	br_features_recompute(br);
1da177e4 LT	480	spin_unlock_bh(&br->lock);
	481
	482	return 0;
	483	}
	484
2c8c1e72	485	void __net_exit br_net_exit(struct net *net)
1da177e4	486	{
ab1b2046	487	struct net_device *dev;
8c56ba05	488	LIST_HEAD(list);
1da177e4 LT	489
1da177e4 LT	490	rtnl_lock();
8c56ba05 ED	491	for_each_netdev(net, dev)
	492	if (dev->priv_flags & IFF_EBRIDGE)
	493	del_br(netdev_priv(dev), &list);
	494
	495	unregister_netdevice_many(&list);
1da177e4 LT	496	rtnl_unlock();
	497
	498	}