[mirror_ubuntu-zesty-kernel.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_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);

	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;

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

	if (!dev)
		return -ENOMEM;

	dev_net_set(dev, net);

	return register_netdev(dev);
}

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);

	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, 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;

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

	del_nbp(p);

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

	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	{
b4a488d1 SH	36	if (dev->ethtool_ops && dev->ethtool_ops->get_settings) {
	37	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET, };
	38
25db0338 DD	39	if (!dev_ethtool_get_settings(dev, &ecmd)) {
25db0338 DD	40	switch (ethtool_cmd_speed(&ecmd)) {
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	63
944c794d	64	/* Check for port carrier transistions. */
269def7c	65	void br_port_carrier_check(struct net_bridge_port *p)
4433f420	66	{
269def7c SH	67	struct net_device *dev = p->dev;
269def7c SH	68	struct net_bridge *br = p->br;
6e86b890	69
aa7c6e5f	70	if (netif_running(dev) && netif_carrier_ok(dev))
6e86b890 SH	71	p->path_cost = port_cost(dev);
6e86b890 SH	72
aa7c6e5f	73	if (!netif_running(br->dev))
	74	return;
	75
	76	spin_lock_bh(&br->lock);
	77	if (netif_running(dev) && 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	}
aa7c6e5f	84	spin_unlock_bh(&br->lock);
4433f420 SH	85	}
4433f420 SH	86
bab1deea SH	87	static void release_nbp(struct kobject *kobj)
	88	{
	89	struct net_bridge_port *p
	90	= container_of(kobj, struct net_bridge_port, kobj);
	91	kfree(p);
	92	}
	93
	94	static struct kobj_type brport_ktype = {
	95	#ifdef CONFIG_SYSFS
	96	.sysfs_ops = &brport_sysfs_ops,
	97	#endif
	98	.release = release_nbp,
	99	};
	100
1da177e4 LT	101	static void destroy_nbp(struct net_bridge_port *p)
	102	{
	103	struct net_device *dev = p->dev;
	104
1da177e4 LT	105	p->br = NULL;
	106	p->dev = NULL;
	107	dev_put(dev);
	108
bab1deea	109	kobject_put(&p->kobj);
1da177e4 LT	110	}
	111
	112	static void destroy_nbp_rcu(struct rcu_head *head)
	113	{
	114	struct net_bridge_port *p =
	115	container_of(head, struct net_bridge_port, rcu);
	116	destroy_nbp(p);
	117	}
	118
3f4cfc2d SH	119	/* Delete port(interface) from bridge is done in two steps.
	120	* via RCU. First step, marks device as down. That deletes
	121	* all the timers and stops new packets from flowing through.
	122	*
	123	* Final cleanup doesn't occur until after all CPU's finished
	124	* processing packets.
	125	*
	126	* Protected from multiple admin operations by RTNL mutex
	127	*/
1da177e4 LT	128	static void del_nbp(struct net_bridge_port *p)
	129	{
	130	struct net_bridge *br = p->br;
	131	struct net_device *dev = p->dev;
	132
b3bcb72e	133	sysfs_remove_link(br->ifobj, p->dev->name);
bab1deea	134
1da177e4 LT	135	dev_set_promiscuity(dev, -1);
	136
	137	spin_lock_bh(&br->lock);
	138	br_stp_disable_port(p);
	139	spin_unlock_bh(&br->lock);
	140
b86c4503 SH	141	br_ifinfo_notify(RTM_DELLINK, p);
b86c4503 SH	142
1a620698	143	br_fdb_delete_by_port(br, p, 1);
1da177e4 LT	144
	145	list_del_rcu(&p->list);
	146
f350a0a8 JP	147	dev->priv_flags &= ~IFF_BRIDGE_PORT;
f350a0a8 JP	148
ab95bfe0	149	netdev_rx_handler_unregister(dev);
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
	163	/* called with RTNL */
8c56ba05	164	static void del_br(struct net_bridge br, struct list_head head)
1da177e4 LT	165	{
	166	struct net_bridge_port p, n;
	167
	168	list_for_each_entry_safe(p, n, &br->port_list, list) {
1da177e4 LT	169	del_nbp(p);
	170	}
	171
	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
1da177e4 LT	178	/* find an available port number */
	179	static int find_portno(struct net_bridge *br)
	180	{
	181	int index;
	182	struct net_bridge_port *p;
	183	unsigned long *inuse;
	184
3b781fa1	185	inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
1da177e4 LT	186	GFP_KERNEL);
	187	if (!inuse)
	188	return -ENOMEM;
	189
1da177e4 LT	190	set_bit(0, inuse); /* zero is reserved */
	191	list_for_each_entry(p, &br->port_list, list) {
	192	set_bit(p->port_no, inuse);
	193	}
	194	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	195	kfree(inuse);
	196
	197	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
	198	}
	199
4433f420	200	/* called with RTNL but without bridge lock */
9d6f229f	201	static struct net_bridge_port new_nbp(struct net_bridge br,
4433f420	202	struct net_device *dev)
1da177e4 LT	203	{
	204	int index;
	205	struct net_bridge_port *p;
9d6f229f	206
1da177e4 LT	207	index = find_portno(br);
	208	if (index < 0)
	209	return ERR_PTR(index);
	210
cee48541	211	p = kzalloc(sizeof(*p), GFP_KERNEL);
1da177e4 LT	212	if (p == NULL)
	213	return ERR_PTR(-ENOMEM);
	214
1da177e4 LT	215	p->br = br;
	216	dev_hold(dev);
	217	p->dev = dev;
4433f420	218	p->path_cost = port_cost(dev);
9d6f229f	219	p->priority = 0x8000 >> BR_PORT_BITS;
1da177e4	220	p->port_no = index;
3982d3d2	221	p->flags = 0;
1da177e4 LT	222	br_init_port(p);
1da177e4 LT	223	p->state = BR_STATE_DISABLED;
d32439c0	224	br_stp_port_timer_init(p);
3fe2d7c7	225	br_multicast_add_port(p);
1da177e4 LT	226
	227	return p;
	228	}
	229
4aa678ba	230	int br_add_bridge(struct net net, const char name)
1da177e4 LT	231	{
1da177e4 LT	232	struct net_device *dev;
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
bb900b27	242	return register_netdev(dev);
1da177e4 LT	243	}
1da177e4 LT	244
4aa678ba	245	int br_del_bridge(struct net net, const char name)
1da177e4 LT	246	{
	247	struct net_device *dev;
	248	int ret = 0;
	249
	250	rtnl_lock();
4aa678ba	251	dev = __dev_get_by_name(net, name);
9d6f229f	252	if (dev == NULL)
1da177e4 LT	253	ret = -ENXIO; /* Could not find device */
	254
	255	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
	256	/* Attempt to delete non bridge device! */
	257	ret = -EPERM;
	258	}
	259
	260	else if (dev->flags & IFF_UP) {
	261	/* Not shutdown yet. */
	262	ret = -EBUSY;
9d6f229f	263	}
1da177e4	264
9d6f229f	265	else
8c56ba05	266	del_br(netdev_priv(dev), NULL);
1da177e4 LT	267
	268	rtnl_unlock();
	269	return ret;
	270	}
	271
46f25dff	272	/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1da177e4 LT	273	int br_min_mtu(const struct net_bridge *br)
	274	{
	275	const struct net_bridge_port *p;
	276	int mtu = 0;
	277
	278	ASSERT_RTNL();
	279
	280	if (list_empty(&br->port_list))
46f25dff	281	mtu = ETH_DATA_LEN;
1da177e4 LT	282	else {
	283	list_for_each_entry(p, &br->port_list, list) {
	284	if (!mtu \|\| p->dev->mtu < mtu)
	285	mtu = p->dev->mtu;
	286	}
	287	}
	288	return mtu;
	289	}
	290
81d35307 SH	291	/*
	292	* Recomputes features using slave's features
	293	*/
c4d27ef9	294	u32 br_features_recompute(struct net_bridge *br, u32 features)
81d35307 SH	295	{
81d35307 SH	296	struct net_bridge_port *p;
c4d27ef9	297	u32 mask;
81d35307	298
b63365a2	299	if (list_empty(&br->port_list))
c4d27ef9	300	return features;
b63365a2	301
c4d27ef9	302	mask = features;
b63365a2	303	features &= ~NETIF_F_ONE_FOR_ALL;
81d35307 SH	304
81d35307 SH	305	list_for_each_entry(p, &br->port_list, list) {
b63365a2 HX	306	features = netdev_increment_features(features,
b63365a2 HX	307	p->dev->features, mask);
81d35307 SH	308	}
81d35307 SH	309
c4d27ef9	310	return features;
81d35307 SH	311	}
81d35307 SH	312
1da177e4 LT	313	/* called with RTNL */
	314	int br_add_if(struct net_bridge br, struct net_device dev)
	315	{
	316	struct net_bridge_port *p;
	317	int err = 0;
edf947f1	318	bool changed_addr;
1da177e4	319
1056bd51 SH	320	/* Don't allow bridging non-ethernet like devices */
	321	if ((dev->flags & IFF_LOOPBACK) \|\|
	322	dev->type != ARPHRD_ETHER \|\| dev->addr_len != ETH_ALEN)
1da177e4 LT	323	return -EINVAL;
1da177e4 LT	324
1056bd51	325	/* No bridging of bridges */
00829823	326	if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
1da177e4 LT	327	return -ELOOP;
1da177e4 LT	328
1056bd51	329	/* Device is already being bridged */
f350a0a8	330	if (br_port_exists(dev))
1da177e4 LT	331	return -EBUSY;
1da177e4 LT	332
ad4bb6f8 JB	333	/* No bridging devices that dislike that (e.g. wireless) */
	334	if (dev->priv_flags & IFF_DONT_BRIDGE)
	335	return -EOPNOTSUPP;
	336
bab1deea SH	337	p = new_nbp(br, dev);
bab1deea SH	338	if (IS_ERR(p))
1da177e4 LT	339	return PTR_ERR(p);
1da177e4 LT	340
bc3f9076 WC	341	err = dev_set_promiscuity(dev, 1);
	342	if (err)
	343	goto put_back;
	344
e32cc736 GKH	345	err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
e32cc736 GKH	346	SYSFS_BRIDGE_PORT_ATTR);
bab1deea SH	347	if (err)
bab1deea SH	348	goto err0;
1da177e4	349
9d6f229f	350	err = br_fdb_insert(br, p, dev->dev_addr);
bab1deea SH	351	if (err)
bab1deea SH	352	goto err1;
1da177e4	353
bab1deea SH	354	err = br_sysfs_addif(p);
	355	if (err)
	356	goto err2;
1da177e4	357
91d2c34a HX	358	if (br_netpoll_info(br) && ((err = br_netpoll_enable(p))))
	359	goto err3;
	360
afc6151a	361	err = netdev_set_master(dev, br->dev);
ab95bfe0	362	if (err)
f350a0a8 JP	363	goto err3;
f350a0a8 JP	364
afc6151a JP	365	err = netdev_rx_handler_register(dev, br_handle_frame, p);
	366	if (err)
	367	goto err4;
	368
f350a0a8	369	dev->priv_flags \|= IFF_BRIDGE_PORT;
ab95bfe0	370
0187bdfb	371	dev_disable_lro(dev);
bab1deea SH	372
	373	list_add_rcu(&p->list, &br->port_list);
	374
c4d27ef9 MM	375	netdev_update_features(br->dev);
c4d27ef9 MM	376
bab1deea	377	spin_lock_bh(&br->lock);
edf947f1	378	changed_addr = br_stp_recalculate_bridge_id(br);
de79059e AS	379
	380	if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
	381	(br->dev->flags & IFF_UP))
	382	br_stp_enable_port(p);
bab1deea SH	383	spin_unlock_bh(&br->lock);
bab1deea SH	384
b86c4503 SH	385	br_ifinfo_notify(RTM_NEWLINK, p);
b86c4503 SH	386
edf947f1	387	if (changed_addr)
	388	call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
	389
bab1deea	390	dev_set_mtu(br->dev, br_min_mtu(br));
269def7c	391
bab1deea	392	kobject_uevent(&p->kobj, KOBJ_ADD);
1da177e4	393
bab1deea	394	return 0;
afc6151a JP	395
	396	err4:
	397	netdev_set_master(dev, NULL);
91d2c34a HX	398	err3:
91d2c34a HX	399	sysfs_remove_link(br->ifobj, p->dev->name);
bab1deea	400	err2:
1a620698	401	br_fdb_delete_by_port(br, p, 1);
bab1deea	402	err1:
c587aea9	403	kobject_put(&p->kobj);
30df94f8	404	p = NULL; /* kobject_put frees */
bab1deea	405	err0:
bc3f9076	406	dev_set_promiscuity(dev, -1);
43af8532 VL	407	put_back:
43af8532 VL	408	dev_put(dev);
bc3f9076	409	kfree(p);
1da177e4 LT	410	return err;
	411	}
	412
	413	/* called with RTNL */
	414	int br_del_if(struct net_bridge br, struct net_device dev)
	415	{
f350a0a8 JP	416	struct net_bridge_port *p;
f350a0a8 JP	417
ec1e5610	418	p = br_port_get_rtnl(dev);
b5ed54e9	419	if (!p \|\| p->br != br)
1da177e4 LT	420	return -EINVAL;
1da177e4 LT	421
1da177e4 LT	422	del_nbp(p);
	423
	424	spin_lock_bh(&br->lock);
	425	br_stp_recalculate_bridge_id(br);
	426	spin_unlock_bh(&br->lock);
	427
c4d27ef9 MM	428	netdev_update_features(br->dev);
c4d27ef9 MM	429
1da177e4 LT	430	return 0;
	431	}
	432
2c8c1e72	433	void __net_exit br_net_exit(struct net *net)
1da177e4	434	{
ab1b2046	435	struct net_device *dev;
8c56ba05	436	LIST_HEAD(list);
1da177e4 LT	437
1da177e4 LT	438	rtnl_lock();
8c56ba05 ED	439	for_each_netdev(net, dev)
	440	if (dev->priv_flags & IFF_EBRIDGE)
	441	del_br(netdev_priv(dev), &list);
	442
	443	unregister_netdevice_many(&list);
1da177e4 LT	444	rtnl_unlock();
	445
	446	}