[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/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);
}

/* 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);
}

/* 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
		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
 */
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)
		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 err0;

	err = br_fdb_insert(br, p, dev->dev_addr);
	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));

	kobject_uevent(&p->kobj, KOBJ_ADD);

	return 0;

err4:
	netdev_set_master(dev, NULL);
err3:
	sysfs_remove_link(br->ifobj, p->dev->name);
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;
	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)
			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	{
fa3df928	36	struct ethtool_cmd ecmd;
b4a488d1	37
4bc71cb9	38	if (!__ethtool_get_settings(dev, &ecmd)) {
fa3df928 JP	39	switch (ethtool_cmd_speed(&ecmd)) {
	40	case SPEED_10000:
	41	return 2;
	42	case SPEED_1000:
	43	return 4;
	44	case SPEED_100:
	45	return 19;
	46	case SPEED_10:
	47	return 100;
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	61
944c794d	62	/* Check for port carrier transistions. */
269def7c	63	void br_port_carrier_check(struct net_bridge_port *p)
4433f420	64	{
269def7c SH	65	struct net_device *dev = p->dev;
269def7c SH	66	struct net_bridge *br = p->br;
6e86b890	67
aa7c6e5f	68	if (netif_running(dev) && netif_carrier_ok(dev))
6e86b890 SH	69	p->path_cost = port_cost(dev);
6e86b890 SH	70
aa7c6e5f	71	if (!netif_running(br->dev))
	72	return;
	73
	74	spin_lock_bh(&br->lock);
	75	if (netif_running(dev) && netif_carrier_ok(dev)) {
	76	if (p->state == BR_STATE_DISABLED)
	77	br_stp_enable_port(p);
	78	} else {
	79	if (p->state != BR_STATE_DISABLED)
	80	br_stp_disable_port(p);
4433f420	81	}
aa7c6e5f	82	spin_unlock_bh(&br->lock);
4433f420 SH	83	}
4433f420 SH	84
bab1deea SH	85	static void release_nbp(struct kobject *kobj)
	86	{
	87	struct net_bridge_port *p
	88	= container_of(kobj, struct net_bridge_port, kobj);
	89	kfree(p);
	90	}
	91
	92	static struct kobj_type brport_ktype = {
	93	#ifdef CONFIG_SYSFS
	94	.sysfs_ops = &brport_sysfs_ops,
	95	#endif
	96	.release = release_nbp,
	97	};
	98
1da177e4 LT	99	static void destroy_nbp(struct net_bridge_port *p)
	100	{
	101	struct net_device *dev = p->dev;
	102
1da177e4 LT	103	p->br = NULL;
	104	p->dev = NULL;
	105	dev_put(dev);
	106
bab1deea	107	kobject_put(&p->kobj);
1da177e4 LT	108	}
	109
	110	static void destroy_nbp_rcu(struct rcu_head *head)
	111	{
	112	struct net_bridge_port *p =
	113	container_of(head, struct net_bridge_port, rcu);
	114	destroy_nbp(p);
	115	}
	116
3f4cfc2d SH	117	/* Delete port(interface) from bridge is done in two steps.
	118	* via RCU. First step, marks device as down. That deletes
	119	* all the timers and stops new packets from flowing through.
	120	*
	121	* Final cleanup doesn't occur until after all CPU's finished
	122	* processing packets.
	123	*
	124	* Protected from multiple admin operations by RTNL mutex
	125	*/
1da177e4 LT	126	static void del_nbp(struct net_bridge_port *p)
	127	{
	128	struct net_bridge *br = p->br;
	129	struct net_device *dev = p->dev;
	130
b3bcb72e	131	sysfs_remove_link(br->ifobj, p->dev->name);
bab1deea	132
1da177e4 LT	133	dev_set_promiscuity(dev, -1);
	134
	135	spin_lock_bh(&br->lock);
	136	br_stp_disable_port(p);
	137	spin_unlock_bh(&br->lock);
	138
b86c4503 SH	139	br_ifinfo_notify(RTM_DELLINK, p);
b86c4503 SH	140
1a620698	141	br_fdb_delete_by_port(br, p, 1);
1da177e4 LT	142
	143	list_del_rcu(&p->list);
	144
f350a0a8 JP	145	dev->priv_flags &= ~IFF_BRIDGE_PORT;
f350a0a8 JP	146
ab95bfe0	147	netdev_rx_handler_unregister(dev);
6df427fe	148	synchronize_net();
b3f1be4b	149
afc6151a JP	150	netdev_set_master(dev, NULL);
afc6151a JP	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
91d2c34a HX	157	br_netpoll_disable(p);
91d2c34a HX	158
1da177e4 LT	159	call_rcu(&p->rcu, destroy_nbp_rcu);
	160	}
	161
	162	/* called with RTNL */
8c56ba05	163	static void del_br(struct net_bridge br, struct list_head head)
1da177e4 LT	164	{
	165	struct net_bridge_port p, n;
	166
	167	list_for_each_entry_safe(p, n, &br->port_list, list) {
1da177e4 LT	168	del_nbp(p);
	169	}
	170
	171	del_timer_sync(&br->gc_timer);
	172
	173	br_sysfs_delbr(br->dev);
8c56ba05	174	unregister_netdevice_queue(br->dev, head);
1da177e4 LT	175	}
1da177e4 LT	176
1da177e4 LT	177	/* find an available port number */
	178	static int find_portno(struct net_bridge *br)
	179	{
	180	int index;
	181	struct net_bridge_port *p;
	182	unsigned long *inuse;
	183
3b781fa1	184	inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
1da177e4 LT	185	GFP_KERNEL);
	186	if (!inuse)
	187	return -ENOMEM;
	188
1da177e4 LT	189	set_bit(0, inuse); /* zero is reserved */
	190	list_for_each_entry(p, &br->port_list, list) {
	191	set_bit(p->port_no, inuse);
	192	}
	193	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	194	kfree(inuse);
	195
	196	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
	197	}
	198
4433f420	199	/* called with RTNL but without bridge lock */
9d6f229f	200	static struct net_bridge_port new_nbp(struct net_bridge br,
4433f420	201	struct net_device *dev)
1da177e4 LT	202	{
	203	int index;
	204	struct net_bridge_port *p;
9d6f229f	205
1da177e4 LT	206	index = find_portno(br);
	207	if (index < 0)
	208	return ERR_PTR(index);
	209
cee48541	210	p = kzalloc(sizeof(*p), GFP_KERNEL);
1da177e4 LT	211	if (p == NULL)
	212	return ERR_PTR(-ENOMEM);
	213
1da177e4 LT	214	p->br = br;
	215	dev_hold(dev);
	216	p->dev = dev;
4433f420	217	p->path_cost = port_cost(dev);
9d6f229f	218	p->priority = 0x8000 >> BR_PORT_BITS;
1da177e4	219	p->port_no = index;
3982d3d2	220	p->flags = 0;
1da177e4 LT	221	br_init_port(p);
1da177e4 LT	222	p->state = BR_STATE_DISABLED;
d32439c0	223	br_stp_port_timer_init(p);
3fe2d7c7	224	br_multicast_add_port(p);
1da177e4 LT	225
	226	return p;
	227	}
	228
4aa678ba	229	int br_add_bridge(struct net net, const char name)
1da177e4 LT	230	{
1da177e4 LT	231	struct net_device *dev;
11f3a6bd	232	int res;
1da177e4	233
bb900b27	234	dev = alloc_netdev(sizeof(struct net_bridge), name,
	235	br_dev_setup);
	236
9d6f229f	237	if (!dev)
1da177e4 LT	238	return -ENOMEM;
1da177e4 LT	239
bb900b27	240	dev_net_set(dev, net);
e340a90e	241
11f3a6bd ED	242	res = register_netdev(dev);
	243	if (res)
	244	free_netdev(dev);
	245	return res;
1da177e4 LT	246	}
1da177e4 LT	247
4aa678ba	248	int br_del_bridge(struct net net, const char name)
1da177e4 LT	249	{
	250	struct net_device *dev;
	251	int ret = 0;
	252
	253	rtnl_lock();
4aa678ba	254	dev = __dev_get_by_name(net, name);
9d6f229f	255	if (dev == NULL)
1da177e4 LT	256	ret = -ENXIO; /* Could not find device */
	257
	258	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
	259	/* Attempt to delete non bridge device! */
	260	ret = -EPERM;
	261	}
	262
	263	else if (dev->flags & IFF_UP) {
	264	/* Not shutdown yet. */
	265	ret = -EBUSY;
9d6f229f	266	}
1da177e4	267
9d6f229f	268	else
8c56ba05	269	del_br(netdev_priv(dev), NULL);
1da177e4 LT	270
	271	rtnl_unlock();
	272	return ret;
	273	}
	274
46f25dff	275	/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1da177e4 LT	276	int br_min_mtu(const struct net_bridge *br)
	277	{
	278	const struct net_bridge_port *p;
	279	int mtu = 0;
	280
	281	ASSERT_RTNL();
	282
	283	if (list_empty(&br->port_list))
46f25dff	284	mtu = ETH_DATA_LEN;
1da177e4 LT	285	else {
	286	list_for_each_entry(p, &br->port_list, list) {
	287	if (!mtu \|\| p->dev->mtu < mtu)
	288	mtu = p->dev->mtu;
	289	}
	290	}
	291	return mtu;
	292	}
	293
81d35307 SH	294	/*
	295	* Recomputes features using slave's features
	296	*/
c4d27ef9	297	u32 br_features_recompute(struct net_bridge *br, u32 features)
81d35307 SH	298	{
81d35307 SH	299	struct net_bridge_port *p;
c4d27ef9	300	u32 mask;
81d35307	301
b63365a2	302	if (list_empty(&br->port_list))
c4d27ef9	303	return features;
b63365a2	304
c4d27ef9	305	mask = features;
b63365a2	306	features &= ~NETIF_F_ONE_FOR_ALL;
81d35307 SH	307
81d35307 SH	308	list_for_each_entry(p, &br->port_list, list) {
b63365a2 HX	309	features = netdev_increment_features(features,
b63365a2 HX	310	p->dev->features, mask);
81d35307 SH	311	}
81d35307 SH	312
c4d27ef9	313	return features;
81d35307 SH	314	}
81d35307 SH	315
1da177e4 LT	316	/* called with RTNL */
	317	int br_add_if(struct net_bridge br, struct net_device dev)
	318	{
	319	struct net_bridge_port *p;
	320	int err = 0;
edf947f1	321	bool changed_addr;
1da177e4	322
1056bd51 SH	323	/* Don't allow bridging non-ethernet like devices */
	324	if ((dev->flags & IFF_LOOPBACK) \|\|
	325	dev->type != ARPHRD_ETHER \|\| dev->addr_len != ETH_ALEN)
1da177e4 LT	326	return -EINVAL;
1da177e4 LT	327
1056bd51	328	/* No bridging of bridges */
00829823	329	if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
1da177e4 LT	330	return -ELOOP;
1da177e4 LT	331
1056bd51	332	/* Device is already being bridged */
f350a0a8	333	if (br_port_exists(dev))
1da177e4 LT	334	return -EBUSY;
1da177e4 LT	335
ad4bb6f8 JB	336	/* No bridging devices that dislike that (e.g. wireless) */
	337	if (dev->priv_flags & IFF_DONT_BRIDGE)
	338	return -EOPNOTSUPP;
	339
bab1deea SH	340	p = new_nbp(br, dev);
bab1deea SH	341	if (IS_ERR(p))
1da177e4 LT	342	return PTR_ERR(p);
1da177e4 LT	343
bb8ed630 AW	344	call_netdevice_notifiers(NETDEV_JOIN, dev);
bb8ed630 AW	345
bc3f9076 WC	346	err = dev_set_promiscuity(dev, 1);
	347	if (err)
	348	goto put_back;
	349
e32cc736 GKH	350	err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
e32cc736 GKH	351	SYSFS_BRIDGE_PORT_ATTR);
bab1deea SH	352	if (err)
bab1deea SH	353	goto err0;
1da177e4	354
9d6f229f	355	err = br_fdb_insert(br, p, dev->dev_addr);
bab1deea SH	356	if (err)
bab1deea SH	357	goto err1;
1da177e4	358
bab1deea SH	359	err = br_sysfs_addif(p);
	360	if (err)
	361	goto err2;
1da177e4	362
91d2c34a HX	363	if (br_netpoll_info(br) && ((err = br_netpoll_enable(p))))
	364	goto err3;
	365
afc6151a	366	err = netdev_set_master(dev, br->dev);
ab95bfe0	367	if (err)
f350a0a8 JP	368	goto err3;
f350a0a8 JP	369
afc6151a JP	370	err = netdev_rx_handler_register(dev, br_handle_frame, p);
	371	if (err)
	372	goto err4;
	373
f350a0a8	374	dev->priv_flags \|= IFF_BRIDGE_PORT;
ab95bfe0	375
0187bdfb	376	dev_disable_lro(dev);
bab1deea SH	377
	378	list_add_rcu(&p->list, &br->port_list);
	379
c4d27ef9 MM	380	netdev_update_features(br->dev);
c4d27ef9 MM	381
bab1deea	382	spin_lock_bh(&br->lock);
edf947f1	383	changed_addr = br_stp_recalculate_bridge_id(br);
de79059e AS	384
	385	if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
	386	(br->dev->flags & IFF_UP))
	387	br_stp_enable_port(p);
bab1deea SH	388	spin_unlock_bh(&br->lock);
bab1deea SH	389
b86c4503 SH	390	br_ifinfo_notify(RTM_NEWLINK, p);
b86c4503 SH	391
edf947f1	392	if (changed_addr)
56139fc5	393	call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
edf947f1	394
bab1deea	395	dev_set_mtu(br->dev, br_min_mtu(br));
269def7c	396
bab1deea	397	kobject_uevent(&p->kobj, KOBJ_ADD);
1da177e4	398
bab1deea	399	return 0;
afc6151a JP	400
	401	err4:
	402	netdev_set_master(dev, NULL);
91d2c34a HX	403	err3:
91d2c34a HX	404	sysfs_remove_link(br->ifobj, p->dev->name);
bab1deea	405	err2:
1a620698	406	br_fdb_delete_by_port(br, p, 1);
bab1deea	407	err1:
c587aea9	408	kobject_put(&p->kobj);
30df94f8	409	p = NULL; /* kobject_put frees */
bab1deea	410	err0:
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)
	449	if (dev->priv_flags & IFF_EBRIDGE)
	450	del_br(netdev_priv(dev), &list);
	451
	452	unregister_netdevice_many(&list);
1da177e4 LT	453	rtnl_unlock();
	454
	455	}