[GitHub/mt8127/android_kernel_alcatel_ttab.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_oper_up(dev))
		p->path_cost = port_cost(dev);

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

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

	nbp_vlan_flush(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_upper_dev_unlink(dev, br->dev);

	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);
	dev->rtnl_link_ops = &br_link_ops;

	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
 */
netdev_features_t br_features_recompute(struct net_bridge *br,
	netdev_features_t features)
{
	struct net_bridge_port *p;
	netdev_features_t 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, GFP_KERNEL))))
		goto err3;

	err = netdev_master_upper_dev_link(dev, br->dev);
	if (err)
		goto err4;

	err = netdev_rx_handler_register(dev, br_handle_frame, p);
	if (err)
		goto err5;

	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 (netif_running(dev) && netif_oper_up(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;

err5:
	netdev_upper_dev_unlink(dev, br->dev);
err4:
	br_netpoll_disable(p);
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;

	/* Since more than one interface can be attached to a bridge,
	 * there still maybe an alternate path for netconsole to use;
	 * therefore there is no reason for a NETDEV_RELEASE event.
	 */
	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
576eb625	69	if (netif_running(dev) && netif_oper_up(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);
576eb625	76	if (netif_running(dev) && netif_oper_up(dev)) {
aa7c6e5f	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
243a2e63	142	nbp_vlan_flush(p);
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);
6df427fe	150	synchronize_net();
b3f1be4b	151
74fdd93f	152	netdev_upper_dev_unlink(dev, br->dev);
afc6151a	153
3fe2d7c7 HX	154	br_multicast_del_port(p);
3fe2d7c7 HX	155
125a12cc	156	kobject_uevent(&p->kobj, KOBJ_REMOVE);
bab1deea SH	157	kobject_del(&p->kobj);
bab1deea SH	158
91d2c34a HX	159	br_netpoll_disable(p);
91d2c34a HX	160
1da177e4 LT	161	call_rcu(&p->rcu, destroy_nbp_rcu);
	162	}
	163
1ce5cce8	164	/* Delete bridge device */
1ce5cce8	165	void br_dev_delete(struct net_device dev, struct list_head head)
1da177e4	166	{
1ce5cce8	167	struct net_bridge *br = netdev_priv(dev);
1da177e4 LT	168	struct net_bridge_port p, n;
	169
	170	list_for_each_entry_safe(p, n, &br->port_list, list) {
1da177e4 LT	171	del_nbp(p);
	172	}
	173
	174	del_timer_sync(&br->gc_timer);
	175
	176	br_sysfs_delbr(br->dev);
8c56ba05	177	unregister_netdevice_queue(br->dev, head);
1da177e4 LT	178	}
1da177e4 LT	179
1da177e4 LT	180	/* find an available port number */
	181	static int find_portno(struct net_bridge *br)
	182	{
	183	int index;
	184	struct net_bridge_port *p;
	185	unsigned long *inuse;
	186
3b781fa1	187	inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
1da177e4 LT	188	GFP_KERNEL);
	189	if (!inuse)
	190	return -ENOMEM;
	191
1da177e4 LT	192	set_bit(0, inuse); /* zero is reserved */
	193	list_for_each_entry(p, &br->port_list, list) {
	194	set_bit(p->port_no, inuse);
	195	}
	196	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	197	kfree(inuse);
	198
	199	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
	200	}
	201
4433f420	202	/* called with RTNL but without bridge lock */
9d6f229f	203	static struct net_bridge_port new_nbp(struct net_bridge br,
4433f420	204	struct net_device *dev)
1da177e4 LT	205	{
	206	int index;
	207	struct net_bridge_port *p;
9d6f229f	208
1da177e4 LT	209	index = find_portno(br);
	210	if (index < 0)
	211	return ERR_PTR(index);
	212
cee48541	213	p = kzalloc(sizeof(*p), GFP_KERNEL);
1da177e4 LT	214	if (p == NULL)
	215	return ERR_PTR(-ENOMEM);
	216
1da177e4 LT	217	p->br = br;
	218	dev_hold(dev);
	219	p->dev = dev;
4433f420	220	p->path_cost = port_cost(dev);
9d6f229f	221	p->priority = 0x8000 >> BR_PORT_BITS;
1da177e4	222	p->port_no = index;
3982d3d2	223	p->flags = 0;
1da177e4 LT	224	br_init_port(p);
1da177e4 LT	225	p->state = BR_STATE_DISABLED;
d32439c0	226	br_stp_port_timer_init(p);
3fe2d7c7	227	br_multicast_add_port(p);
1da177e4 LT	228
	229	return p;
	230	}
	231
4aa678ba	232	int br_add_bridge(struct net net, const char name)
1da177e4 LT	233	{
1da177e4 LT	234	struct net_device *dev;
11f3a6bd	235	int res;
1da177e4	236
bb900b27	237	dev = alloc_netdev(sizeof(struct net_bridge), name,
	238	br_dev_setup);
	239
9d6f229f	240	if (!dev)
1da177e4 LT	241	return -ENOMEM;
1da177e4 LT	242
bb900b27	243	dev_net_set(dev, net);
149ddd83	244	dev->rtnl_link_ops = &br_link_ops;
e340a90e	245
11f3a6bd ED	246	res = register_netdev(dev);
	247	if (res)
	248	free_netdev(dev);
	249	return res;
1da177e4 LT	250	}
1da177e4 LT	251
4aa678ba	252	int br_del_bridge(struct net net, const char name)
1da177e4 LT	253	{
	254	struct net_device *dev;
	255	int ret = 0;
	256
	257	rtnl_lock();
4aa678ba	258	dev = __dev_get_by_name(net, name);
9d6f229f	259	if (dev == NULL)
1da177e4 LT	260	ret = -ENXIO; /* Could not find device */
	261
	262	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
	263	/* Attempt to delete non bridge device! */
	264	ret = -EPERM;
	265	}
	266
	267	else if (dev->flags & IFF_UP) {
	268	/* Not shutdown yet. */
	269	ret = -EBUSY;
9d6f229f	270	}
1da177e4	271
9d6f229f	272	else
1ce5cce8	273	br_dev_delete(dev, NULL);
1da177e4 LT	274
	275	rtnl_unlock();
	276	return ret;
	277	}
	278
46f25dff	279	/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1da177e4 LT	280	int br_min_mtu(const struct net_bridge *br)
	281	{
	282	const struct net_bridge_port *p;
	283	int mtu = 0;
	284
	285	ASSERT_RTNL();
	286
	287	if (list_empty(&br->port_list))
46f25dff	288	mtu = ETH_DATA_LEN;
1da177e4 LT	289	else {
	290	list_for_each_entry(p, &br->port_list, list) {
	291	if (!mtu \|\| p->dev->mtu < mtu)
	292	mtu = p->dev->mtu;
	293	}
	294	}
	295	return mtu;
	296	}
	297
81d35307 SH	298	/*
	299	* Recomputes features using slave's features
	300	*/
c8f44aff MM	301	netdev_features_t br_features_recompute(struct net_bridge *br,
c8f44aff MM	302	netdev_features_t features)
81d35307 SH	303	{
81d35307 SH	304	struct net_bridge_port *p;
c8f44aff	305	netdev_features_t mask;
81d35307	306
b63365a2	307	if (list_empty(&br->port_list))
c4d27ef9	308	return features;
b63365a2	309
c4d27ef9	310	mask = features;
b63365a2	311	features &= ~NETIF_F_ONE_FOR_ALL;
81d35307 SH	312
81d35307 SH	313	list_for_each_entry(p, &br->port_list, list) {
b63365a2 HX	314	features = netdev_increment_features(features,
b63365a2 HX	315	p->dev->features, mask);
81d35307 SH	316	}
81d35307 SH	317
c4d27ef9	318	return features;
81d35307 SH	319	}
81d35307 SH	320
1da177e4 LT	321	/* called with RTNL */
	322	int br_add_if(struct net_bridge br, struct net_device dev)
	323	{
	324	struct net_bridge_port *p;
	325	int err = 0;
edf947f1	326	bool changed_addr;
1da177e4	327
1056bd51 SH	328	/* Don't allow bridging non-ethernet like devices */
1056bd51 SH	329	if ((dev->flags & IFF_LOOPBACK) \|\|
77f98598	330	dev->type != ARPHRD_ETHER \|\| dev->addr_len != ETH_ALEN \|\|
77f98598	331	!is_valid_ether_addr(dev->dev_addr))
1da177e4 LT	332	return -EINVAL;
1da177e4 LT	333
1056bd51	334	/* No bridging of bridges */
00829823	335	if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
1da177e4 LT	336	return -ELOOP;
1da177e4 LT	337
1056bd51	338	/* Device is already being bridged */
f350a0a8	339	if (br_port_exists(dev))
1da177e4 LT	340	return -EBUSY;
1da177e4 LT	341
ad4bb6f8 JB	342	/* No bridging devices that dislike that (e.g. wireless) */
	343	if (dev->priv_flags & IFF_DONT_BRIDGE)
	344	return -EOPNOTSUPP;
	345
bab1deea SH	346	p = new_nbp(br, dev);
bab1deea SH	347	if (IS_ERR(p))
1da177e4 LT	348	return PTR_ERR(p);
1da177e4 LT	349
bb8ed630 AW	350	call_netdevice_notifiers(NETDEV_JOIN, dev);
bb8ed630 AW	351
bc3f9076 WC	352	err = dev_set_promiscuity(dev, 1);
	353	if (err)
	354	goto put_back;
	355
e32cc736 GKH	356	err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
e32cc736 GKH	357	SYSFS_BRIDGE_PORT_ATTR);
bab1deea SH	358	if (err)
bab1deea SH	359	goto err1;
1da177e4	360
bab1deea SH	361	err = br_sysfs_addif(p);
	362	if (err)
	363	goto err2;
1da177e4	364
47be03a2	365	if (br_netpoll_info(br) && ((err = br_netpoll_enable(p, GFP_KERNEL))))
91d2c34a HX	366	goto err3;
91d2c34a HX	367
74fdd93f	368	err = netdev_master_upper_dev_link(dev, br->dev);
ab95bfe0	369	if (err)
9b1536c4	370	goto err4;
f350a0a8	371
afc6151a JP	372	err = netdev_rx_handler_register(dev, br_handle_frame, p);
afc6151a JP	373	if (err)
9b1536c4	374	goto err5;
afc6151a	375
f350a0a8	376	dev->priv_flags \|= IFF_BRIDGE_PORT;
ab95bfe0	377
0187bdfb	378	dev_disable_lro(dev);
bab1deea SH	379
	380	list_add_rcu(&p->list, &br->port_list);
	381
c4d27ef9 MM	382	netdev_update_features(br->dev);
c4d27ef9 MM	383
bab1deea	384	spin_lock_bh(&br->lock);
edf947f1	385	changed_addr = br_stp_recalculate_bridge_id(br);
de79059e	386
576eb625	387	if (netif_running(dev) && netif_oper_up(dev) &&
de79059e AS	388	(br->dev->flags & IFF_UP))
de79059e AS	389	br_stp_enable_port(p);
bab1deea SH	390	spin_unlock_bh(&br->lock);
bab1deea SH	391
b86c4503 SH	392	br_ifinfo_notify(RTM_NEWLINK, p);
b86c4503 SH	393
edf947f1	394	if (changed_addr)
56139fc5	395	call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
edf947f1	396
bab1deea	397	dev_set_mtu(br->dev, br_min_mtu(br));
269def7c	398
77f98598	399	if (br_fdb_insert(br, p, dev->dev_addr))
	400	netdev_err(dev, "failed insert local address bridge forwarding table\n");
	401
bab1deea	402	kobject_uevent(&p->kobj, KOBJ_ADD);
1da177e4	403
bab1deea	404	return 0;
afc6151a	405
9b1536c4	406	err5:
74fdd93f	407	netdev_upper_dev_unlink(dev, br->dev);
9b1536c4 G	408	err4:
9b1536c4 G	409	br_netpoll_disable(p);
91d2c34a HX	410	err3:
91d2c34a HX	411	sysfs_remove_link(br->ifobj, p->dev->name);
bab1deea	412	err2:
c587aea9	413	kobject_put(&p->kobj);
30df94f8	414	p = NULL; /* kobject_put frees */
77f98598	415	err1:
bc3f9076	416	dev_set_promiscuity(dev, -1);
43af8532 VL	417	put_back:
43af8532 VL	418	dev_put(dev);
bc3f9076	419	kfree(p);
1da177e4 LT	420	return err;
	421	}
	422
	423	/* called with RTNL */
	424	int br_del_if(struct net_bridge br, struct net_device dev)
	425	{
f350a0a8	426	struct net_bridge_port *p;
9be6dd65	427	bool changed_addr;
f350a0a8	428
ec1e5610	429	p = br_port_get_rtnl(dev);
b5ed54e9	430	if (!p \|\| p->br != br)
1da177e4 LT	431	return -EINVAL;
1da177e4 LT	432
d30362c0 AW	433	/* Since more than one interface can be attached to a bridge,
	434	* there still maybe an alternate path for netconsole to use;
	435	* therefore there is no reason for a NETDEV_RELEASE event.
	436	*/
1da177e4 LT	437	del_nbp(p);
	438
	439	spin_lock_bh(&br->lock);
9be6dd65	440	changed_addr = br_stp_recalculate_bridge_id(br);
1da177e4 LT	441	spin_unlock_bh(&br->lock);
1da177e4 LT	442
9be6dd65 AW	443	if (changed_addr)
	444	call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
	445
c4d27ef9 MM	446	netdev_update_features(br->dev);
c4d27ef9 MM	447
1da177e4 LT	448	return 0;
	449	}
	450
2c8c1e72	451	void __net_exit br_net_exit(struct net *net)
1da177e4	452	{
ab1b2046	453	struct net_device *dev;
8c56ba05	454	LIST_HEAD(list);
1da177e4 LT	455
1da177e4 LT	456	rtnl_lock();
8c56ba05 ED	457	for_each_netdev(net, dev)
8c56ba05 ED	458	if (dev->priv_flags & IFF_EBRIDGE)
1ce5cce8	459	br_dev_delete(dev, &list);
8c56ba05 ED	460
8c56ba05 ED	461	unregister_netdevice_many(&list);
1da177e4 LT	462	rtnl_unlock();
	463
	464	}