[linux-block.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/etherdevice.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)
{
	struct ethtool_cmd ecmd;

	if (!__ethtool_get_settings(dev, &ecmd)) {
		switch (ethtool_cmd_speed(&ecmd)) {
		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. */
void br_port_carrier_check(struct net_bridge_port *p)
{
	struct net_device *dev = p->dev;
	struct net_bridge *br = p->br;

	if (netif_running(dev) && netif_carrier_ok(dev))
		p->path_cost = port_cost(dev);

	if (!netif_running(br->dev))
		return;

	spin_lock_bh(&br->lock);
	if (netif_running(dev) && 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);

	dev->priv_flags &= ~IFF_BRIDGE_PORT;

	netdev_rx_handler_unregister(dev);
	synchronize_net();

	netdev_set_master(dev, NULL);

	br_multicast_del_port(p);

	kobject_uevent(&p->kobj, KOBJ_REMOVE);
	kobject_del(&p->kobj);

	br_netpoll_disable(p);

	call_rcu(&p->rcu, destroy_nbp_rcu);
}

/* Delete bridge device */
void br_dev_delete(struct net_device *dev, struct list_head *head)
{
	struct net_bridge *br = netdev_priv(dev);
	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);
}

/* 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;
}

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

	dev = alloc_netdev(sizeof(struct net_bridge), name,
			   br_dev_setup);

	if (!dev)
		return -ENOMEM;

	dev_net_set(dev, net);

	res = register_netdev(dev);
	if (res)
		free_netdev(dev);
	return res;
}

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
		br_dev_delete(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
 */
u32 br_features_recompute(struct net_bridge *br, u32 features)
{
	struct net_bridge_port *p;
	u32 mask;

	if (list_empty(&br->port_list))
		return features;

	mask = features;
	features &= ~NETIF_F_ONE_FOR_ALL;

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

	return features;
}

/* called with RTNL */
int br_add_if(struct net_bridge *br, struct net_device *dev)
{
	struct net_bridge_port *p;
	int err = 0;
	bool changed_addr;

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

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

	/* Device is already being bridged */
	if (br_port_exists(dev))
		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);

	call_netdevice_notifiers(NETDEV_JOIN, dev);

	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 err1;

	err = br_sysfs_addif(p);
	if (err)
		goto err2;

	if (br_netpoll_info(br) && ((err = br_netpoll_enable(p))))
		goto err3;

	err = netdev_set_master(dev, br->dev);
	if (err)
		goto err3;

	err = netdev_rx_handler_register(dev, br_handle_frame, p);
	if (err)
		goto err4;

	dev->priv_flags |= IFF_BRIDGE_PORT;

	dev_disable_lro(dev);

	list_add_rcu(&p->list, &br->port_list);

	netdev_update_features(br->dev);

	spin_lock_bh(&br->lock);
	changed_addr = br_stp_recalculate_bridge_id(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);

	if (changed_addr)
		call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);

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

	if (br_fdb_insert(br, p, dev->dev_addr))
		netdev_err(dev, "failed insert local address bridge forwarding table\n");

	kobject_uevent(&p->kobj, KOBJ_ADD);

	return 0;

err4:
	netdev_set_master(dev, NULL);
err3:
	sysfs_remove_link(br->ifobj, p->dev->name);
err2:
	kobject_put(&p->kobj);
	p = NULL; /* kobject_put frees */
err1:
	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;
	bool changed_addr;

	p = br_port_get_rtnl(dev);
	if (!p || p->br != br)
		return -EINVAL;

	del_nbp(p);

	spin_lock_bh(&br->lock);
	changed_addr = br_stp_recalculate_bridge_id(br);
	spin_unlock_bh(&br->lock);

	if (changed_addr)
		call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);

	netdev_update_features(br->dev);

	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)
			br_dev_delete(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>
77f98598	16	#include <linux/etherdevice.h>
c06ee961	17	#include <linux/netpoll.h>
1da177e4 LT	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>
5a0e3ad6	24	#include <linux/slab.h>
1da177e4 LT	25	#include <net/sock.h>
	26
	27	#include "br_private.h"
	28
	29	/*
	30	* Determine initial path cost based on speed.
	31	* using recommendations from 802.1d standard
	32	*
61a44b9c	33	* Since driver might sleep need to not be holding any locks.
1da177e4	34	*/
4433f420	35	static int port_cost(struct net_device *dev)
1da177e4	36	{
fa3df928	37	struct ethtool_cmd ecmd;
b4a488d1	38
4bc71cb9	39	if (!__ethtool_get_settings(dev, &ecmd)) {
fa3df928 JP	40	switch (ethtool_cmd_speed(&ecmd)) {
	41	case SPEED_10000:
	42	return 2;
	43	case SPEED_1000:
	44	return 4;
	45	case SPEED_100:
	46	return 19;
	47	case SPEED_10:
	48	return 100;
1da177e4 LT	49	}
	50	}
	51
	52	/* Old silly heuristics based on name */
	53	if (!strncmp(dev->name, "lec", 3))
	54	return 7;
	55
	56	if (!strncmp(dev->name, "plip", 4))
	57	return 2500;
	58
	59	return 100; /* assume old 10Mbps */
	60	}
	61
4433f420	62
944c794d	63	/* Check for port carrier transistions. */
269def7c	64	void br_port_carrier_check(struct net_bridge_port *p)
4433f420	65	{
269def7c SH	66	struct net_device *dev = p->dev;
269def7c SH	67	struct net_bridge *br = p->br;
6e86b890	68
aa7c6e5f	69	if (netif_running(dev) && netif_carrier_ok(dev))
6e86b890 SH	70	p->path_cost = port_cost(dev);
6e86b890 SH	71
aa7c6e5f	72	if (!netif_running(br->dev))
	73	return;
	74
	75	spin_lock_bh(&br->lock);
	76	if (netif_running(dev) && netif_carrier_ok(dev)) {
	77	if (p->state == BR_STATE_DISABLED)
	78	br_stp_enable_port(p);
	79	} else {
	80	if (p->state != BR_STATE_DISABLED)
	81	br_stp_disable_port(p);
4433f420	82	}
aa7c6e5f	83	spin_unlock_bh(&br->lock);
4433f420 SH	84	}
4433f420 SH	85
bab1deea SH	86	static void release_nbp(struct kobject *kobj)
	87	{
	88	struct net_bridge_port *p
	89	= container_of(kobj, struct net_bridge_port, kobj);
	90	kfree(p);
	91	}
	92
	93	static struct kobj_type brport_ktype = {
	94	#ifdef CONFIG_SYSFS
	95	.sysfs_ops = &brport_sysfs_ops,
	96	#endif
	97	.release = release_nbp,
	98	};
	99
1da177e4 LT	100	static void destroy_nbp(struct net_bridge_port *p)
	101	{
	102	struct net_device *dev = p->dev;
	103
1da177e4 LT	104	p->br = NULL;
	105	p->dev = NULL;
	106	dev_put(dev);
	107
bab1deea	108	kobject_put(&p->kobj);
1da177e4 LT	109	}
	110
	111	static void destroy_nbp_rcu(struct rcu_head *head)
	112	{
	113	struct net_bridge_port *p =
	114	container_of(head, struct net_bridge_port, rcu);
	115	destroy_nbp(p);
	116	}
	117
3f4cfc2d SH	118	/* Delete port(interface) from bridge is done in two steps.
	119	* via RCU. First step, marks device as down. That deletes
	120	* all the timers and stops new packets from flowing through.
	121	*
	122	* Final cleanup doesn't occur until after all CPU's finished
	123	* processing packets.
	124	*
	125	* Protected from multiple admin operations by RTNL mutex
	126	*/
1da177e4 LT	127	static void del_nbp(struct net_bridge_port *p)
	128	{
	129	struct net_bridge *br = p->br;
	130	struct net_device *dev = p->dev;
	131
b3bcb72e	132	sysfs_remove_link(br->ifobj, p->dev->name);
bab1deea	133
1da177e4 LT	134	dev_set_promiscuity(dev, -1);
	135
	136	spin_lock_bh(&br->lock);
	137	br_stp_disable_port(p);
	138	spin_unlock_bh(&br->lock);
	139
b86c4503 SH	140	br_ifinfo_notify(RTM_DELLINK, p);
b86c4503 SH	141
1a620698	142	br_fdb_delete_by_port(br, p, 1);
1da177e4 LT	143
	144	list_del_rcu(&p->list);
	145
f350a0a8 JP	146	dev->priv_flags &= ~IFF_BRIDGE_PORT;
f350a0a8 JP	147
ab95bfe0	148	netdev_rx_handler_unregister(dev);
6df427fe	149	synchronize_net();
b3f1be4b	150
afc6151a JP	151	netdev_set_master(dev, NULL);
afc6151a JP	152
3fe2d7c7 HX	153	br_multicast_del_port(p);
3fe2d7c7 HX	154
125a12cc	155	kobject_uevent(&p->kobj, KOBJ_REMOVE);
bab1deea SH	156	kobject_del(&p->kobj);
bab1deea SH	157
91d2c34a HX	158	br_netpoll_disable(p);
91d2c34a HX	159
1da177e4 LT	160	call_rcu(&p->rcu, destroy_nbp_rcu);
	161	}
	162
1ce5cce8	163	/* Delete bridge device */
1ce5cce8	164	void br_dev_delete(struct net_device dev, struct list_head head)
1da177e4	165	{
1ce5cce8	166	struct net_bridge *br = netdev_priv(dev);
1da177e4 LT	167	struct net_bridge_port p, n;
	168
	169	list_for_each_entry_safe(p, n, &br->port_list, list) {
1da177e4 LT	170	del_nbp(p);
	171	}
	172
	173	del_timer_sync(&br->gc_timer);
	174
	175	br_sysfs_delbr(br->dev);
8c56ba05	176	unregister_netdevice_queue(br->dev, head);
1da177e4 LT	177	}
1da177e4 LT	178
1da177e4 LT	179	/* find an available port number */
	180	static int find_portno(struct net_bridge *br)
	181	{
	182	int index;
	183	struct net_bridge_port *p;
	184	unsigned long *inuse;
	185
3b781fa1	186	inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
1da177e4 LT	187	GFP_KERNEL);
	188	if (!inuse)
	189	return -ENOMEM;
	190
1da177e4 LT	191	set_bit(0, inuse); /* zero is reserved */
	192	list_for_each_entry(p, &br->port_list, list) {
	193	set_bit(p->port_no, inuse);
	194	}
	195	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	196	kfree(inuse);
	197
	198	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
	199	}
	200
4433f420	201	/* called with RTNL but without bridge lock */
9d6f229f	202	static struct net_bridge_port new_nbp(struct net_bridge br,
4433f420	203	struct net_device *dev)
1da177e4 LT	204	{
	205	int index;
	206	struct net_bridge_port *p;
9d6f229f	207
1da177e4 LT	208	index = find_portno(br);
	209	if (index < 0)
	210	return ERR_PTR(index);
	211
cee48541	212	p = kzalloc(sizeof(*p), GFP_KERNEL);
1da177e4 LT	213	if (p == NULL)
	214	return ERR_PTR(-ENOMEM);
	215
1da177e4 LT	216	p->br = br;
	217	dev_hold(dev);
	218	p->dev = dev;
4433f420	219	p->path_cost = port_cost(dev);
9d6f229f	220	p->priority = 0x8000 >> BR_PORT_BITS;
1da177e4	221	p->port_no = index;
3982d3d2	222	p->flags = 0;
1da177e4 LT	223	br_init_port(p);
1da177e4 LT	224	p->state = BR_STATE_DISABLED;
d32439c0	225	br_stp_port_timer_init(p);
3fe2d7c7	226	br_multicast_add_port(p);
1da177e4 LT	227
	228	return p;
	229	}
	230
4aa678ba	231	int br_add_bridge(struct net net, const char name)
1da177e4 LT	232	{
1da177e4 LT	233	struct net_device *dev;
11f3a6bd	234	int res;
1da177e4	235
bb900b27	236	dev = alloc_netdev(sizeof(struct net_bridge), name,
	237	br_dev_setup);
	238
9d6f229f	239	if (!dev)
1da177e4 LT	240	return -ENOMEM;
1da177e4 LT	241
bb900b27	242	dev_net_set(dev, net);
e340a90e	243
11f3a6bd ED	244	res = register_netdev(dev);
	245	if (res)
	246	free_netdev(dev);
	247	return res;
1da177e4 LT	248	}
1da177e4 LT	249
4aa678ba	250	int br_del_bridge(struct net net, const char name)
1da177e4 LT	251	{
	252	struct net_device *dev;
	253	int ret = 0;
	254
	255	rtnl_lock();
4aa678ba	256	dev = __dev_get_by_name(net, name);
9d6f229f	257	if (dev == NULL)
1da177e4 LT	258	ret = -ENXIO; /* Could not find device */
	259
	260	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
	261	/* Attempt to delete non bridge device! */
	262	ret = -EPERM;
	263	}
	264
	265	else if (dev->flags & IFF_UP) {
	266	/* Not shutdown yet. */
	267	ret = -EBUSY;
9d6f229f	268	}
1da177e4	269
9d6f229f	270	else
1ce5cce8	271	br_dev_delete(dev, NULL);
1da177e4 LT	272
	273	rtnl_unlock();
	274	return ret;
	275	}
	276
46f25dff	277	/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1da177e4 LT	278	int br_min_mtu(const struct net_bridge *br)
	279	{
	280	const struct net_bridge_port *p;
	281	int mtu = 0;
	282
	283	ASSERT_RTNL();
	284
	285	if (list_empty(&br->port_list))
46f25dff	286	mtu = ETH_DATA_LEN;
1da177e4 LT	287	else {
	288	list_for_each_entry(p, &br->port_list, list) {
	289	if (!mtu \|\| p->dev->mtu < mtu)
	290	mtu = p->dev->mtu;
	291	}
	292	}
	293	return mtu;
	294	}
	295
81d35307 SH	296	/*
	297	* Recomputes features using slave's features
	298	*/
c4d27ef9	299	u32 br_features_recompute(struct net_bridge *br, u32 features)
81d35307 SH	300	{
81d35307 SH	301	struct net_bridge_port *p;
c4d27ef9	302	u32 mask;
81d35307	303
b63365a2	304	if (list_empty(&br->port_list))
c4d27ef9	305	return features;
b63365a2	306
c4d27ef9	307	mask = features;
b63365a2	308	features &= ~NETIF_F_ONE_FOR_ALL;
81d35307 SH	309
81d35307 SH	310	list_for_each_entry(p, &br->port_list, list) {
b63365a2 HX	311	features = netdev_increment_features(features,
b63365a2 HX	312	p->dev->features, mask);
81d35307 SH	313	}
81d35307 SH	314
c4d27ef9	315	return features;
81d35307 SH	316	}
81d35307 SH	317
1da177e4 LT	318	/* called with RTNL */
	319	int br_add_if(struct net_bridge br, struct net_device dev)
	320	{
	321	struct net_bridge_port *p;
	322	int err = 0;
edf947f1	323	bool changed_addr;
1da177e4	324
1056bd51 SH	325	/* Don't allow bridging non-ethernet like devices */
1056bd51 SH	326	if ((dev->flags & IFF_LOOPBACK) \|\|
77f98598	327	dev->type != ARPHRD_ETHER \|\| dev->addr_len != ETH_ALEN \|\|
77f98598	328	!is_valid_ether_addr(dev->dev_addr))
1da177e4 LT	329	return -EINVAL;
1da177e4 LT	330
1056bd51	331	/* No bridging of bridges */
00829823	332	if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
1da177e4 LT	333	return -ELOOP;
1da177e4 LT	334
1056bd51	335	/* Device is already being bridged */
f350a0a8	336	if (br_port_exists(dev))
1da177e4 LT	337	return -EBUSY;
1da177e4 LT	338
ad4bb6f8 JB	339	/* No bridging devices that dislike that (e.g. wireless) */
	340	if (dev->priv_flags & IFF_DONT_BRIDGE)
	341	return -EOPNOTSUPP;
	342
bab1deea SH	343	p = new_nbp(br, dev);
bab1deea SH	344	if (IS_ERR(p))
1da177e4 LT	345	return PTR_ERR(p);
1da177e4 LT	346
bb8ed630 AW	347	call_netdevice_notifiers(NETDEV_JOIN, dev);
bb8ed630 AW	348
bc3f9076 WC	349	err = dev_set_promiscuity(dev, 1);
	350	if (err)
	351	goto put_back;
	352
e32cc736 GKH	353	err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
e32cc736 GKH	354	SYSFS_BRIDGE_PORT_ATTR);
bab1deea SH	355	if (err)
bab1deea SH	356	goto err1;
1da177e4	357
bab1deea SH	358	err = br_sysfs_addif(p);
	359	if (err)
	360	goto err2;
1da177e4	361
91d2c34a HX	362	if (br_netpoll_info(br) && ((err = br_netpoll_enable(p))))
	363	goto err3;
	364
afc6151a	365	err = netdev_set_master(dev, br->dev);
ab95bfe0	366	if (err)
f350a0a8 JP	367	goto err3;
f350a0a8 JP	368
afc6151a JP	369	err = netdev_rx_handler_register(dev, br_handle_frame, p);
	370	if (err)
	371	goto err4;
	372
f350a0a8	373	dev->priv_flags \|= IFF_BRIDGE_PORT;
ab95bfe0	374
0187bdfb	375	dev_disable_lro(dev);
bab1deea SH	376
	377	list_add_rcu(&p->list, &br->port_list);
	378
c4d27ef9 MM	379	netdev_update_features(br->dev);
c4d27ef9 MM	380
bab1deea	381	spin_lock_bh(&br->lock);
edf947f1	382	changed_addr = br_stp_recalculate_bridge_id(br);
de79059e AS	383
	384	if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
	385	(br->dev->flags & IFF_UP))
	386	br_stp_enable_port(p);
bab1deea SH	387	spin_unlock_bh(&br->lock);
bab1deea SH	388
b86c4503 SH	389	br_ifinfo_notify(RTM_NEWLINK, p);
b86c4503 SH	390
edf947f1	391	if (changed_addr)
56139fc5	392	call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
edf947f1	393
bab1deea	394	dev_set_mtu(br->dev, br_min_mtu(br));
269def7c	395
77f98598	396	if (br_fdb_insert(br, p, dev->dev_addr))
	397	netdev_err(dev, "failed insert local address bridge forwarding table\n");
	398
bab1deea	399	kobject_uevent(&p->kobj, KOBJ_ADD);
1da177e4	400
bab1deea	401	return 0;
afc6151a JP	402
	403	err4:
	404	netdev_set_master(dev, NULL);
91d2c34a HX	405	err3:
91d2c34a HX	406	sysfs_remove_link(br->ifobj, p->dev->name);
bab1deea	407	err2:
c587aea9	408	kobject_put(&p->kobj);
30df94f8	409	p = NULL; /* kobject_put frees */
77f98598	410	err1:
bc3f9076	411	dev_set_promiscuity(dev, -1);
43af8532 VL	412	put_back:
43af8532 VL	413	dev_put(dev);
bc3f9076	414	kfree(p);
1da177e4 LT	415	return err;
	416	}
	417
	418	/* called with RTNL */
	419	int br_del_if(struct net_bridge br, struct net_device dev)
	420	{
f350a0a8	421	struct net_bridge_port *p;
9be6dd65	422	bool changed_addr;
f350a0a8	423
ec1e5610	424	p = br_port_get_rtnl(dev);
b5ed54e9	425	if (!p \|\| p->br != br)
1da177e4 LT	426	return -EINVAL;
1da177e4 LT	427
1da177e4 LT	428	del_nbp(p);
	429
	430	spin_lock_bh(&br->lock);
9be6dd65	431	changed_addr = br_stp_recalculate_bridge_id(br);
1da177e4 LT	432	spin_unlock_bh(&br->lock);
1da177e4 LT	433
9be6dd65 AW	434	if (changed_addr)
	435	call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
	436
c4d27ef9 MM	437	netdev_update_features(br->dev);
c4d27ef9 MM	438
1da177e4 LT	439	return 0;
	440	}
	441
2c8c1e72	442	void __net_exit br_net_exit(struct net *net)
1da177e4	443	{
ab1b2046	444	struct net_device *dev;
8c56ba05	445	LIST_HEAD(list);
1da177e4 LT	446
1da177e4 LT	447	rtnl_lock();
8c56ba05 ED	448	for_each_netdev(net, dev)
8c56ba05 ED	449	if (dev->priv_flags & IFF_EBRIDGE)
1ce5cce8	450	br_dev_delete(dev, &list);
8c56ba05 ED	451
8c56ba05 ED	452	unregister_netdevice_many(&list);
1da177e4 LT	453	rtnl_unlock();
	454
	455	}