[linux.git] / net / bridge / br_if.c

/*
 *	Userspace interface
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<[email protected]>
 *
 *	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 <linux/if_vlan.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 (!(p->flags & BR_ADMIN_COST) &&
	    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);

	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 = BR_LEARNING | BR_FLOOD;
	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, 0))
		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 <[email protected]>
	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	25	#include <net/sock.h>
407af329	26	#include <linux/if_vlan.h>
1da177e4 LT	27
	28	#include "br_private.h"
	29
	30	/*
	31	* Determine initial path cost based on speed.
	32	* using recommendations from 802.1d standard
	33	*
61a44b9c	34	* Since driver might sleep need to not be holding any locks.
1da177e4	35	*/
4433f420	36	static int port_cost(struct net_device *dev)
1da177e4	37	{
fa3df928	38	struct ethtool_cmd ecmd;
b4a488d1	39
4bc71cb9	40	if (!__ethtool_get_settings(dev, &ecmd)) {
fa3df928 JP	41	switch (ethtool_cmd_speed(&ecmd)) {
	42	case SPEED_10000:
	43	return 2;
	44	case SPEED_1000:
	45	return 4;
	46	case SPEED_100:
	47	return 19;
	48	case SPEED_10:
	49	return 100;
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
8f3359bd	70	if (!(p->flags & BR_ADMIN_COST) &&
8f3359bd	71	netif_running(dev) && netif_oper_up(dev))
6e86b890 SH	72	p->path_cost = port_cost(dev);
6e86b890 SH	73
aa7c6e5f	74	if (!netif_running(br->dev))
	75	return;
	76
	77	spin_lock_bh(&br->lock);
576eb625	78	if (netif_running(dev) && netif_oper_up(dev)) {
aa7c6e5f	79	if (p->state == BR_STATE_DISABLED)
	80	br_stp_enable_port(p);
	81	} else {
	82	if (p->state != BR_STATE_DISABLED)
	83	br_stp_disable_port(p);
4433f420	84	}
aa7c6e5f	85	spin_unlock_bh(&br->lock);
4433f420 SH	86	}
4433f420 SH	87
bab1deea SH	88	static void release_nbp(struct kobject *kobj)
	89	{
	90	struct net_bridge_port *p
	91	= container_of(kobj, struct net_bridge_port, kobj);
	92	kfree(p);
	93	}
	94
	95	static struct kobj_type brport_ktype = {
	96	#ifdef CONFIG_SYSFS
	97	.sysfs_ops = &brport_sysfs_ops,
	98	#endif
	99	.release = release_nbp,
	100	};
	101
1da177e4 LT	102	static void destroy_nbp(struct net_bridge_port *p)
	103	{
	104	struct net_device *dev = p->dev;
	105
1da177e4 LT	106	p->br = NULL;
	107	p->dev = NULL;
	108	dev_put(dev);
	109
bab1deea	110	kobject_put(&p->kobj);
1da177e4 LT	111	}
	112
	113	static void destroy_nbp_rcu(struct rcu_head *head)
	114	{
	115	struct net_bridge_port *p =
	116	container_of(head, struct net_bridge_port, rcu);
	117	destroy_nbp(p);
	118	}
	119
3f4cfc2d SH	120	/* Delete port(interface) from bridge is done in two steps.
	121	* via RCU. First step, marks device as down. That deletes
	122	* all the timers and stops new packets from flowing through.
	123	*
	124	* Final cleanup doesn't occur until after all CPU's finished
	125	* processing packets.
	126	*
	127	* Protected from multiple admin operations by RTNL mutex
	128	*/
1da177e4 LT	129	static void del_nbp(struct net_bridge_port *p)
	130	{
	131	struct net_bridge *br = p->br;
	132	struct net_device *dev = p->dev;
	133
b3bcb72e	134	sysfs_remove_link(br->ifobj, p->dev->name);
bab1deea	135
1da177e4 LT	136	dev_set_promiscuity(dev, -1);
	137
	138	spin_lock_bh(&br->lock);
	139	br_stp_disable_port(p);
	140	spin_unlock_bh(&br->lock);
	141
b86c4503 SH	142	br_ifinfo_notify(RTM_DELLINK, p);
b86c4503 SH	143
243a2e63	144	nbp_vlan_flush(p);
1a620698	145	br_fdb_delete_by_port(br, p, 1);
1da177e4 LT	146
	147	list_del_rcu(&p->list);
	148
f350a0a8 JP	149	dev->priv_flags &= ~IFF_BRIDGE_PORT;
f350a0a8 JP	150
ab95bfe0	151	netdev_rx_handler_unregister(dev);
b3f1be4b	152
74fdd93f	153	netdev_upper_dev_unlink(dev, br->dev);
afc6151a	154
3fe2d7c7 HX	155	br_multicast_del_port(p);
3fe2d7c7 HX	156
125a12cc	157	kobject_uevent(&p->kobj, KOBJ_REMOVE);
bab1deea SH	158	kobject_del(&p->kobj);
bab1deea SH	159
91d2c34a HX	160	br_netpoll_disable(p);
91d2c34a HX	161
1da177e4 LT	162	call_rcu(&p->rcu, destroy_nbp_rcu);
	163	}
	164
1ce5cce8	165	/* Delete bridge device */
1ce5cce8	166	void br_dev_delete(struct net_device dev, struct list_head head)
1da177e4	167	{
1ce5cce8	168	struct net_bridge *br = netdev_priv(dev);
1da177e4 LT	169	struct net_bridge_port p, n;
	170
	171	list_for_each_entry_safe(p, n, &br->port_list, list) {
1da177e4 LT	172	del_nbp(p);
	173	}
	174
	175	del_timer_sync(&br->gc_timer);
	176
	177	br_sysfs_delbr(br->dev);
8c56ba05	178	unregister_netdevice_queue(br->dev, head);
1da177e4 LT	179	}
1da177e4 LT	180
1da177e4 LT	181	/* find an available port number */
	182	static int find_portno(struct net_bridge *br)
	183	{
	184	int index;
	185	struct net_bridge_port *p;
	186	unsigned long *inuse;
	187
3b781fa1	188	inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
1da177e4 LT	189	GFP_KERNEL);
	190	if (!inuse)
	191	return -ENOMEM;
	192
1da177e4 LT	193	set_bit(0, inuse); /* zero is reserved */
	194	list_for_each_entry(p, &br->port_list, list) {
	195	set_bit(p->port_no, inuse);
	196	}
	197	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	198	kfree(inuse);
	199
	200	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
	201	}
	202
4433f420	203	/* called with RTNL but without bridge lock */
9d6f229f	204	static struct net_bridge_port new_nbp(struct net_bridge br,
4433f420	205	struct net_device *dev)
1da177e4 LT	206	{
	207	int index;
	208	struct net_bridge_port *p;
9d6f229f	209
1da177e4 LT	210	index = find_portno(br);
	211	if (index < 0)
	212	return ERR_PTR(index);
	213
cee48541	214	p = kzalloc(sizeof(*p), GFP_KERNEL);
1da177e4 LT	215	if (p == NULL)
	216	return ERR_PTR(-ENOMEM);
	217
1da177e4 LT	218	p->br = br;
	219	dev_hold(dev);
	220	p->dev = dev;
4433f420	221	p->path_cost = port_cost(dev);
9d6f229f	222	p->priority = 0x8000 >> BR_PORT_BITS;
1da177e4	223	p->port_no = index;
867a5943	224	p->flags = BR_LEARNING \| BR_FLOOD;
1da177e4 LT	225	br_init_port(p);
1da177e4 LT	226	p->state = BR_STATE_DISABLED;
d32439c0	227	br_stp_port_timer_init(p);
3fe2d7c7	228	br_multicast_add_port(p);
1da177e4 LT	229
	230	return p;
	231	}
	232
4aa678ba	233	int br_add_bridge(struct net net, const char name)
1da177e4 LT	234	{
1da177e4 LT	235	struct net_device *dev;
11f3a6bd	236	int res;
1da177e4	237
bb900b27	238	dev = alloc_netdev(sizeof(struct net_bridge), name,
	239	br_dev_setup);
	240
9d6f229f	241	if (!dev)
1da177e4 LT	242	return -ENOMEM;
1da177e4 LT	243
bb900b27	244	dev_net_set(dev, net);
149ddd83	245	dev->rtnl_link_ops = &br_link_ops;
e340a90e	246
11f3a6bd ED	247	res = register_netdev(dev);
	248	if (res)
	249	free_netdev(dev);
	250	return res;
1da177e4 LT	251	}
1da177e4 LT	252
4aa678ba	253	int br_del_bridge(struct net net, const char name)
1da177e4 LT	254	{
	255	struct net_device *dev;
	256	int ret = 0;
	257
	258	rtnl_lock();
4aa678ba	259	dev = __dev_get_by_name(net, name);
9d6f229f	260	if (dev == NULL)
1da177e4 LT	261	ret = -ENXIO; /* Could not find device */
	262
	263	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
	264	/* Attempt to delete non bridge device! */
	265	ret = -EPERM;
	266	}
	267
	268	else if (dev->flags & IFF_UP) {
	269	/* Not shutdown yet. */
	270	ret = -EBUSY;
9d6f229f	271	}
1da177e4	272
9d6f229f	273	else
1ce5cce8	274	br_dev_delete(dev, NULL);
1da177e4 LT	275
	276	rtnl_unlock();
	277	return ret;
	278	}
	279
46f25dff	280	/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1da177e4 LT	281	int br_min_mtu(const struct net_bridge *br)
	282	{
	283	const struct net_bridge_port *p;
	284	int mtu = 0;
	285
	286	ASSERT_RTNL();
	287
	288	if (list_empty(&br->port_list))
46f25dff	289	mtu = ETH_DATA_LEN;
1da177e4 LT	290	else {
	291	list_for_each_entry(p, &br->port_list, list) {
	292	if (!mtu \|\| p->dev->mtu < mtu)
	293	mtu = p->dev->mtu;
	294	}
	295	}
	296	return mtu;
	297	}
	298
81d35307 SH	299	/*
	300	* Recomputes features using slave's features
	301	*/
c8f44aff MM	302	netdev_features_t br_features_recompute(struct net_bridge *br,
c8f44aff MM	303	netdev_features_t features)
81d35307 SH	304	{
81d35307 SH	305	struct net_bridge_port *p;
c8f44aff	306	netdev_features_t mask;
81d35307	307
b63365a2	308	if (list_empty(&br->port_list))
c4d27ef9	309	return features;
b63365a2	310
c4d27ef9	311	mask = features;
b63365a2	312	features &= ~NETIF_F_ONE_FOR_ALL;
81d35307 SH	313
81d35307 SH	314	list_for_each_entry(p, &br->port_list, list) {
b63365a2 HX	315	features = netdev_increment_features(features,
b63365a2 HX	316	p->dev->features, mask);
81d35307 SH	317	}
81d35307 SH	318
c4d27ef9	319	return features;
81d35307 SH	320	}
81d35307 SH	321
1da177e4 LT	322	/* called with RTNL */
	323	int br_add_if(struct net_bridge br, struct net_device dev)
	324	{
	325	struct net_bridge_port *p;
	326	int err = 0;
edf947f1	327	bool changed_addr;
1da177e4	328
1056bd51 SH	329	/* Don't allow bridging non-ethernet like devices */
1056bd51 SH	330	if ((dev->flags & IFF_LOOPBACK) \|\|
77f98598	331	dev->type != ARPHRD_ETHER \|\| dev->addr_len != ETH_ALEN \|\|
77f98598	332	!is_valid_ether_addr(dev->dev_addr))
1da177e4 LT	333	return -EINVAL;
1da177e4 LT	334
1056bd51	335	/* No bridging of bridges */
00829823	336	if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
1da177e4 LT	337	return -ELOOP;
1da177e4 LT	338
1056bd51	339	/* Device is already being bridged */
f350a0a8	340	if (br_port_exists(dev))
1da177e4 LT	341	return -EBUSY;
1da177e4 LT	342
ad4bb6f8 JB	343	/* No bridging devices that dislike that (e.g. wireless) */
	344	if (dev->priv_flags & IFF_DONT_BRIDGE)
	345	return -EOPNOTSUPP;
	346
bab1deea SH	347	p = new_nbp(br, dev);
bab1deea SH	348	if (IS_ERR(p))
1da177e4 LT	349	return PTR_ERR(p);
1da177e4 LT	350
bb8ed630 AW	351	call_netdevice_notifiers(NETDEV_JOIN, dev);
bb8ed630 AW	352
bc3f9076 WC	353	err = dev_set_promiscuity(dev, 1);
	354	if (err)
	355	goto put_back;
	356
e32cc736 GKH	357	err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
e32cc736 GKH	358	SYSFS_BRIDGE_PORT_ATTR);
bab1deea SH	359	if (err)
bab1deea SH	360	goto err1;
1da177e4	361
bab1deea SH	362	err = br_sysfs_addif(p);
	363	if (err)
	364	goto err2;
1da177e4	365
47be03a2	366	if (br_netpoll_info(br) && ((err = br_netpoll_enable(p, GFP_KERNEL))))
91d2c34a HX	367	goto err3;
91d2c34a HX	368
74fdd93f	369	err = netdev_master_upper_dev_link(dev, br->dev);
ab95bfe0	370	if (err)
9b1536c4	371	goto err4;
f350a0a8	372
afc6151a JP	373	err = netdev_rx_handler_register(dev, br_handle_frame, p);
afc6151a JP	374	if (err)
9b1536c4	375	goto err5;
afc6151a	376
f350a0a8	377	dev->priv_flags \|= IFF_BRIDGE_PORT;
ab95bfe0	378
0187bdfb	379	dev_disable_lro(dev);
bab1deea SH	380
	381	list_add_rcu(&p->list, &br->port_list);
	382
c4d27ef9 MM	383	netdev_update_features(br->dev);
c4d27ef9 MM	384
bab1deea	385	spin_lock_bh(&br->lock);
edf947f1	386	changed_addr = br_stp_recalculate_bridge_id(br);
de79059e	387
576eb625	388	if (netif_running(dev) && netif_oper_up(dev) &&
de79059e AS	389	(br->dev->flags & IFF_UP))
de79059e AS	390	br_stp_enable_port(p);
bab1deea SH	391	spin_unlock_bh(&br->lock);
bab1deea SH	392
b86c4503 SH	393	br_ifinfo_notify(RTM_NEWLINK, p);
b86c4503 SH	394
edf947f1	395	if (changed_addr)
56139fc5	396	call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
edf947f1	397
bab1deea	398	dev_set_mtu(br->dev, br_min_mtu(br));
269def7c	399
bc9a25d2	400	if (br_fdb_insert(br, p, dev->dev_addr, 0))
77f98598	401	netdev_err(dev, "failed insert local address bridge forwarding table\n");
77f98598	402
bab1deea	403	kobject_uevent(&p->kobj, KOBJ_ADD);
1da177e4	404
bab1deea	405	return 0;
afc6151a	406
9b1536c4	407	err5:
74fdd93f	408	netdev_upper_dev_unlink(dev, br->dev);
9b1536c4 G	409	err4:
9b1536c4 G	410	br_netpoll_disable(p);
91d2c34a HX	411	err3:
91d2c34a HX	412	sysfs_remove_link(br->ifobj, p->dev->name);
bab1deea	413	err2:
c587aea9	414	kobject_put(&p->kobj);
30df94f8	415	p = NULL; /* kobject_put frees */
77f98598	416	err1:
bc3f9076	417	dev_set_promiscuity(dev, -1);
43af8532 VL	418	put_back:
43af8532 VL	419	dev_put(dev);
bc3f9076	420	kfree(p);
1da177e4 LT	421	return err;
	422	}
	423
	424	/* called with RTNL */
	425	int br_del_if(struct net_bridge br, struct net_device dev)
	426	{
f350a0a8	427	struct net_bridge_port *p;
9be6dd65	428	bool changed_addr;
f350a0a8	429
ec1e5610	430	p = br_port_get_rtnl(dev);
b5ed54e9	431	if (!p \|\| p->br != br)
1da177e4 LT	432	return -EINVAL;
1da177e4 LT	433
d30362c0 AW	434	/* Since more than one interface can be attached to a bridge,
	435	* there still maybe an alternate path for netconsole to use;
	436	* therefore there is no reason for a NETDEV_RELEASE event.
	437	*/
1da177e4 LT	438	del_nbp(p);
	439
	440	spin_lock_bh(&br->lock);
9be6dd65	441	changed_addr = br_stp_recalculate_bridge_id(br);
1da177e4 LT	442	spin_unlock_bh(&br->lock);
1da177e4 LT	443
9be6dd65 AW	444	if (changed_addr)
	445	call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
	446
c4d27ef9 MM	447	netdev_update_features(br->dev);
c4d27ef9 MM	448
1da177e4 LT	449	return 0;
	450	}
	451
2c8c1e72	452	void __net_exit br_net_exit(struct net *net)
1da177e4	453	{
ab1b2046	454	struct net_device *dev;
8c56ba05	455	LIST_HEAD(list);
1da177e4 LT	456
1da177e4 LT	457	rtnl_lock();
8c56ba05 ED	458	for_each_netdev(net, dev)
8c56ba05 ED	459	if (dev->priv_flags & IFF_EBRIDGE)
1ce5cce8	460	br_dev_delete(dev, &list);
8c56ba05 ED	461
8c56ba05 ED	462	unregister_netdevice_many(&list);
1da177e4 LT	463	rtnl_unlock();
	464
	465	}