[deliverable/linux.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_ops->get_settings(dev, &ecmd)) {
			switch(ecmd.speed) {
			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.
 * Called from work queue to allow for calling functions that
 * might sleep (such as speed check), and to debounce.
 */
void br_port_carrier_check(struct net_bridge_port *p)
{
	struct net_device *dev = p->dev;
	struct net_bridge *br = p->br;

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

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

	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);
}

static struct net_device *new_bridge_dev(struct net *net, const char *name)
{
	struct net_bridge *br;
	struct net_device *dev;

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

	if (!dev)
		return NULL;
	dev_net_set(dev, net);

	br = netdev_priv(dev);
	br->dev = dev;

	br->stats = alloc_percpu(struct br_cpu_netstats);
	if (!br->stats) {
		free_netdev(dev);
		return NULL;
	}

	spin_lock_init(&br->lock);
	INIT_LIST_HEAD(&br->port_list);
	spin_lock_init(&br->hash_lock);

	br->bridge_id.prio[0] = 0x80;
	br->bridge_id.prio[1] = 0x00;

	memcpy(br->group_addr, br_group_address, ETH_ALEN);

	br->feature_mask = dev->features;
	br->stp_enabled = BR_NO_STP;
	br->designated_root = br->bridge_id;
	br->root_path_cost = 0;
	br->root_port = 0;
	br->bridge_max_age = br->max_age = 20 * HZ;
	br->bridge_hello_time = br->hello_time = 2 * HZ;
	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
	br->topology_change = 0;
	br->topology_change_detected = 0;
	br->ageing_time = 300 * HZ;

	br_netfilter_rtable_init(br);

	br_stp_timer_init(br);
	br_multicast_init(br);

	return dev;
}

/* 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;
}

static struct device_type br_type = {
	.name	= "bridge",
};

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

	dev = new_bridge_dev(net, name);
	if (!dev)
		return -ENOMEM;

	rtnl_lock();
	if (strchr(dev->name, '%')) {
		ret = dev_alloc_name(dev, dev->name);
		if (ret < 0)
			goto out_free;
	}

	SET_NETDEV_DEVTYPE(dev, &br_type);

	ret = register_netdevice(dev);
	if (ret)
		goto out_free;

	ret = br_sysfs_addbr(dev);
	if (ret)
		unregister_netdevice(dev);
 out:
	rtnl_unlock();
	return ret;

out_free:
	free_netdev(dev);
	goto out;
}

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
 */
void br_features_recompute(struct net_bridge *br)
{
	struct net_bridge_port *p;
	unsigned long features, mask;

	features = mask = br->feature_mask;
	if (list_empty(&br->port_list))
		goto done;

	features &= ~NETIF_F_ONE_FOR_ALL;

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

done:
	br->dev->features = netdev_fix_features(features, NULL);
}

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

	/* 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_rx_handler_register(dev, br_handle_frame, p);
	if (err)
		goto err3;

	dev->priv_flags |= IFF_BRIDGE_PORT;

	dev_disable_lro(dev);

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

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

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

	kobject_uevent(&p->kobj, KOBJ_ADD);

	return 0;
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;

	if (!br_port_exists(dev))
		return -EINVAL;

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

	del_nbp(p);

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

	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
	39	if (!dev->ethtool_ops->get_settings(dev, &ecmd)) {
61a44b9c	40	switch(ecmd.speed) {
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 SH	63
	64	/*
	65	* Check for port carrier transistions.
	66	* Called from work queue to allow for calling functions that
	67	* might sleep (such as speed check), and to debounce.
	68	*/
269def7c	69	void br_port_carrier_check(struct net_bridge_port *p)
4433f420	70	{
269def7c SH	71	struct net_device *dev = p->dev;
269def7c SH	72	struct net_bridge *br = p->br;
6e86b890 SH	73
	74	if (netif_carrier_ok(dev))
	75	p->path_cost = port_cost(dev);
	76
269def7c	77	if (netif_running(br->dev)) {
6e86b890 SH	78	spin_lock_bh(&br->lock);
	79	if (netif_carrier_ok(dev)) {
	80	if (p->state == BR_STATE_DISABLED)
	81	br_stp_enable_port(p);
	82	} else {
	83	if (p->state != BR_STATE_DISABLED)
	84	br_stp_disable_port(p);
4433f420	85	}
6e86b890	86	spin_unlock_bh(&br->lock);
4433f420	87	}
4433f420 SH	88	}
4433f420 SH	89
bab1deea SH	90	static void release_nbp(struct kobject *kobj)
	91	{
	92	struct net_bridge_port *p
	93	= container_of(kobj, struct net_bridge_port, kobj);
	94	kfree(p);
	95	}
	96
	97	static struct kobj_type brport_ktype = {
	98	#ifdef CONFIG_SYSFS
	99	.sysfs_ops = &brport_sysfs_ops,
	100	#endif
	101	.release = release_nbp,
	102	};
	103
1da177e4 LT	104	static void destroy_nbp(struct net_bridge_port *p)
	105	{
	106	struct net_device *dev = p->dev;
	107
1da177e4 LT	108	p->br = NULL;
	109	p->dev = NULL;
	110	dev_put(dev);
	111
bab1deea	112	kobject_put(&p->kobj);
1da177e4 LT	113	}
	114
	115	static void destroy_nbp_rcu(struct rcu_head *head)
	116	{
	117	struct net_bridge_port *p =
	118	container_of(head, struct net_bridge_port, rcu);
	119	destroy_nbp(p);
	120	}
	121
3f4cfc2d SH	122	/* Delete port(interface) from bridge is done in two steps.
	123	* via RCU. First step, marks device as down. That deletes
	124	* all the timers and stops new packets from flowing through.
	125	*
	126	* Final cleanup doesn't occur until after all CPU's finished
	127	* processing packets.
	128	*
	129	* Protected from multiple admin operations by RTNL mutex
	130	*/
1da177e4 LT	131	static void del_nbp(struct net_bridge_port *p)
	132	{
	133	struct net_bridge *br = p->br;
	134	struct net_device *dev = p->dev;
	135
b3bcb72e	136	sysfs_remove_link(br->ifobj, p->dev->name);
bab1deea	137
1da177e4 LT	138	dev_set_promiscuity(dev, -1);
	139
	140	spin_lock_bh(&br->lock);
	141	br_stp_disable_port(p);
	142	spin_unlock_bh(&br->lock);
	143
b86c4503 SH	144	br_ifinfo_notify(RTM_DELLINK, p);
b86c4503 SH	145
1a620698	146	br_fdb_delete_by_port(br, p, 1);
1da177e4 LT	147
	148	list_del_rcu(&p->list);
	149
f350a0a8 JP	150	dev->priv_flags &= ~IFF_BRIDGE_PORT;
f350a0a8 JP	151
ab95bfe0	152	netdev_rx_handler_unregister(dev);
b3f1be4b	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
	164	/* called with RTNL */
8c56ba05	165	static void del_br(struct net_bridge br, struct list_head head)
1da177e4 LT	166	{
	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
4aa678ba	179	static struct net_device new_bridge_dev(struct net net, const char *name)
1da177e4 LT	180	{
	181	struct net_bridge *br;
	182	struct net_device *dev;
	183
	184	dev = alloc_netdev(sizeof(struct net_bridge), name,
	185	br_dev_setup);
9d6f229f	186
1da177e4 LT	187	if (!dev)
1da177e4 LT	188	return NULL;
4aa678ba	189	dev_net_set(dev, net);
1da177e4 LT	190
	191	br = netdev_priv(dev);
	192	br->dev = dev;
	193
14bb4789	194	br->stats = alloc_percpu(struct br_cpu_netstats);
	195	if (!br->stats) {
	196	free_netdev(dev);
	197	return NULL;
	198	}
	199
1da177e4 LT	200	spin_lock_init(&br->lock);
	201	INIT_LIST_HEAD(&br->port_list);
	202	spin_lock_init(&br->hash_lock);
	203
	204	br->bridge_id.prio[0] = 0x80;
	205	br->bridge_id.prio[1] = 0x00;
cee48541 SH	206
cee48541 SH	207	memcpy(br->group_addr, br_group_address, ETH_ALEN);
1da177e4	208
edb5e46f	209	br->feature_mask = dev->features;
9cde0708	210	br->stp_enabled = BR_NO_STP;
1da177e4 LT	211	br->designated_root = br->bridge_id;
	212	br->root_path_cost = 0;
	213	br->root_port = 0;
	214	br->bridge_max_age = br->max_age = 20 * HZ;
	215	br->bridge_hello_time = br->hello_time = 2 * HZ;
	216	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
	217	br->topology_change = 0;
	218	br->topology_change_detected = 0;
	219	br->ageing_time = 300 * HZ;
4adf0af6 SW	220
	221	br_netfilter_rtable_init(br);
	222
1da177e4	223	br_stp_timer_init(br);
3fe2d7c7	224	br_multicast_init(br);
1da177e4 LT	225
	226	return dev;
	227	}
	228
	229	/* find an available port number */
	230	static int find_portno(struct net_bridge *br)
	231	{
	232	int index;
	233	struct net_bridge_port *p;
	234	unsigned long *inuse;
	235
3b781fa1	236	inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
1da177e4 LT	237	GFP_KERNEL);
	238	if (!inuse)
	239	return -ENOMEM;
	240
1da177e4 LT	241	set_bit(0, inuse); /* zero is reserved */
	242	list_for_each_entry(p, &br->port_list, list) {
	243	set_bit(p->port_no, inuse);
	244	}
	245	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	246	kfree(inuse);
	247
	248	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
	249	}
	250
4433f420	251	/* called with RTNL but without bridge lock */
9d6f229f	252	static struct net_bridge_port new_nbp(struct net_bridge br,
4433f420	253	struct net_device *dev)
1da177e4 LT	254	{
	255	int index;
	256	struct net_bridge_port *p;
9d6f229f	257
1da177e4 LT	258	index = find_portno(br);
	259	if (index < 0)
	260	return ERR_PTR(index);
	261
cee48541	262	p = kzalloc(sizeof(*p), GFP_KERNEL);
1da177e4 LT	263	if (p == NULL)
	264	return ERR_PTR(-ENOMEM);
	265
1da177e4 LT	266	p->br = br;
	267	dev_hold(dev);
	268	p->dev = dev;
4433f420	269	p->path_cost = port_cost(dev);
9d6f229f	270	p->priority = 0x8000 >> BR_PORT_BITS;
1da177e4	271	p->port_no = index;
3982d3d2	272	p->flags = 0;
1da177e4 LT	273	br_init_port(p);
1da177e4 LT	274	p->state = BR_STATE_DISABLED;
d32439c0	275	br_stp_port_timer_init(p);
3fe2d7c7	276	br_multicast_add_port(p);
1da177e4 LT	277
	278	return p;
	279	}
	280
384912ed MH	281	static struct device_type br_type = {
	282	.name = "bridge",
	283	};
	284
4aa678ba	285	int br_add_bridge(struct net net, const char name)
1da177e4 LT	286	{
	287	struct net_device *dev;
	288	int ret;
	289
4aa678ba	290	dev = new_bridge_dev(net, name);
9d6f229f	291	if (!dev)
1da177e4 LT	292	return -ENOMEM;
	293
	294	rtnl_lock();
	295	if (strchr(dev->name, '%')) {
	296	ret = dev_alloc_name(dev, dev->name);
e340a90e PE	297	if (ret < 0)
e340a90e PE	298	goto out_free;
1da177e4 LT	299	}
1da177e4 LT	300
384912ed MH	301	SET_NETDEV_DEVTYPE(dev, &br_type);
384912ed MH	302
1da177e4	303	ret = register_netdevice(dev);
e340a90e PE	304	if (ret)
e340a90e PE	305	goto out_free;
1da177e4	306
1da177e4	307	ret = br_sysfs_addbr(dev);
ac05202e	308	if (ret)
36485707 JB	309	unregister_netdevice(dev);
36485707 JB	310	out:
1da177e4	311	rtnl_unlock();
ac05202e	312	return ret;
e340a90e PE	313
	314	out_free:
	315	free_netdev(dev);
	316	goto out;
1da177e4 LT	317	}
1da177e4 LT	318
4aa678ba	319	int br_del_bridge(struct net net, const char name)
1da177e4 LT	320	{
	321	struct net_device *dev;
	322	int ret = 0;
	323
	324	rtnl_lock();
4aa678ba	325	dev = __dev_get_by_name(net, name);
9d6f229f	326	if (dev == NULL)
1da177e4 LT	327	ret = -ENXIO; /* Could not find device */
	328
	329	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
	330	/* Attempt to delete non bridge device! */
	331	ret = -EPERM;
	332	}
	333
	334	else if (dev->flags & IFF_UP) {
	335	/* Not shutdown yet. */
	336	ret = -EBUSY;
9d6f229f	337	}
1da177e4	338
9d6f229f	339	else
8c56ba05	340	del_br(netdev_priv(dev), NULL);
1da177e4 LT	341
	342	rtnl_unlock();
	343	return ret;
	344	}
	345
46f25dff	346	/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1da177e4 LT	347	int br_min_mtu(const struct net_bridge *br)
	348	{
	349	const struct net_bridge_port *p;
	350	int mtu = 0;
	351
	352	ASSERT_RTNL();
	353
	354	if (list_empty(&br->port_list))
46f25dff	355	mtu = ETH_DATA_LEN;
1da177e4 LT	356	else {
	357	list_for_each_entry(p, &br->port_list, list) {
	358	if (!mtu \|\| p->dev->mtu < mtu)
	359	mtu = p->dev->mtu;
	360	}
	361	}
	362	return mtu;
	363	}
	364
81d35307 SH	365	/*
	366	* Recomputes features using slave's features
	367	*/
	368	void br_features_recompute(struct net_bridge *br)
	369	{
	370	struct net_bridge_port *p;
b63365a2	371	unsigned long features, mask;
81d35307	372
b63365a2 HX	373	features = mask = br->feature_mask;
	374	if (list_empty(&br->port_list))
	375	goto done;
	376
	377	features &= ~NETIF_F_ONE_FOR_ALL;
81d35307 SH	378
81d35307 SH	379	list_for_each_entry(p, &br->port_list, list) {
b63365a2 HX	380	features = netdev_increment_features(features,
b63365a2 HX	381	p->dev->features, mask);
81d35307 SH	382	}
81d35307 SH	383
b63365a2 HX	384	done:
b63365a2 HX	385	br->dev->features = netdev_fix_features(features, NULL);
81d35307 SH	386	}
81d35307 SH	387
1da177e4 LT	388	/* called with RTNL */
	389	int br_add_if(struct net_bridge br, struct net_device dev)
	390	{
	391	struct net_bridge_port *p;
	392	int err = 0;
	393
1056bd51 SH	394	/* Don't allow bridging non-ethernet like devices */
	395	if ((dev->flags & IFF_LOOPBACK) \|\|
	396	dev->type != ARPHRD_ETHER \|\| dev->addr_len != ETH_ALEN)
1da177e4 LT	397	return -EINVAL;
1da177e4 LT	398
1056bd51	399	/* No bridging of bridges */
00829823	400	if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
1da177e4 LT	401	return -ELOOP;
1da177e4 LT	402
1056bd51	403	/* Device is already being bridged */
f350a0a8	404	if (br_port_exists(dev))
1da177e4 LT	405	return -EBUSY;
1da177e4 LT	406
ad4bb6f8 JB	407	/* No bridging devices that dislike that (e.g. wireless) */
	408	if (dev->priv_flags & IFF_DONT_BRIDGE)
	409	return -EOPNOTSUPP;
	410
bab1deea SH	411	p = new_nbp(br, dev);
bab1deea SH	412	if (IS_ERR(p))
1da177e4 LT	413	return PTR_ERR(p);
1da177e4 LT	414
bc3f9076 WC	415	err = dev_set_promiscuity(dev, 1);
	416	if (err)
	417	goto put_back;
	418
e32cc736 GKH	419	err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
e32cc736 GKH	420	SYSFS_BRIDGE_PORT_ATTR);
bab1deea SH	421	if (err)
bab1deea SH	422	goto err0;
1da177e4	423
9d6f229f	424	err = br_fdb_insert(br, p, dev->dev_addr);
bab1deea SH	425	if (err)
bab1deea SH	426	goto err1;
1da177e4	427
bab1deea SH	428	err = br_sysfs_addif(p);
	429	if (err)
	430	goto err2;
1da177e4	431
91d2c34a HX	432	if (br_netpoll_info(br) && ((err = br_netpoll_enable(p))))
	433	goto err3;
	434
f350a0a8	435	err = netdev_rx_handler_register(dev, br_handle_frame, p);
ab95bfe0	436	if (err)
f350a0a8 JP	437	goto err3;
	438
	439	dev->priv_flags \|= IFF_BRIDGE_PORT;
ab95bfe0	440
0187bdfb	441	dev_disable_lro(dev);
bab1deea SH	442
	443	list_add_rcu(&p->list, &br->port_list);
	444
	445	spin_lock_bh(&br->lock);
	446	br_stp_recalculate_bridge_id(br);
	447	br_features_recompute(br);
de79059e AS	448
	449	if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
	450	(br->dev->flags & IFF_UP))
	451	br_stp_enable_port(p);
bab1deea SH	452	spin_unlock_bh(&br->lock);
bab1deea SH	453
b86c4503 SH	454	br_ifinfo_notify(RTM_NEWLINK, p);
b86c4503 SH	455
bab1deea	456	dev_set_mtu(br->dev, br_min_mtu(br));
269def7c	457
bab1deea	458	kobject_uevent(&p->kobj, KOBJ_ADD);
1da177e4	459
bab1deea	460	return 0;
91d2c34a HX	461	err3:
91d2c34a HX	462	sysfs_remove_link(br->ifobj, p->dev->name);
bab1deea	463	err2:
1a620698	464	br_fdb_delete_by_port(br, p, 1);
bab1deea	465	err1:
c587aea9	466	kobject_put(&p->kobj);
30df94f8	467	p = NULL; /* kobject_put frees */
bab1deea	468	err0:
bc3f9076	469	dev_set_promiscuity(dev, -1);
43af8532 VL	470	put_back:
43af8532 VL	471	dev_put(dev);
bc3f9076	472	kfree(p);
1da177e4 LT	473	return err;
	474	}
	475
	476	/* called with RTNL */
	477	int br_del_if(struct net_bridge br, struct net_device dev)
	478	{
f350a0a8 JP	479	struct net_bridge_port *p;
	480
	481	if (!br_port_exists(dev))
	482	return -EINVAL;
9d6f229f	483
f350a0a8 JP	484	p = br_port_get(dev);
f350a0a8 JP	485	if (p->br != br)
1da177e4 LT	486	return -EINVAL;
1da177e4 LT	487
1da177e4 LT	488	del_nbp(p);
	489
	490	spin_lock_bh(&br->lock);
	491	br_stp_recalculate_bridge_id(br);
81d35307	492	br_features_recompute(br);
1da177e4 LT	493	spin_unlock_bh(&br->lock);
	494
	495	return 0;
	496	}
	497
2c8c1e72	498	void __net_exit br_net_exit(struct net *net)
1da177e4	499	{
ab1b2046	500	struct net_device *dev;
8c56ba05	501	LIST_HEAD(list);
1da177e4 LT	502
1da177e4 LT	503	rtnl_lock();
8c56ba05 ED	504	for_each_netdev(net, dev)
	505	if (dev->priv_flags & IFF_EBRIDGE)
	506	del_br(netdev_priv(dev), &list);
	507
	508	unregister_netdevice_many(&list);
1da177e4 LT	509	rtnl_unlock();
	510
	511	}