[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/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, 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);

	rcu_assign_pointer(dev->br_port, NULL);

	br_multicast_del_port(p);

	kobject_uevent(&p->kobj, KOBJ_REMOVE);
	kobject_del(&p->kobj);

	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;

	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 (dev->br_port != NULL)
		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;

	rcu_assign_pointer(dev->br_port, p);
	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;
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 = dev->br_port;

	if (!p || 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>
	16	#include <linux/ethtool.h>
	17	#include <linux/if_arp.h>
	18	#include <linux/module.h>
	19	#include <linux/init.h>
	20	#include <linux/rtnetlink.h>
46f25dff	21	#include <linux/if_ether.h>
5a0e3ad6	22	#include <linux/slab.h>
1da177e4 LT	23	#include <net/sock.h>
	24
	25	#include "br_private.h"
	26
	27	/*
	28	* Determine initial path cost based on speed.
	29	* using recommendations from 802.1d standard
	30	*
61a44b9c	31	* Since driver might sleep need to not be holding any locks.
1da177e4	32	*/
4433f420	33	static int port_cost(struct net_device *dev)
1da177e4	34	{
b4a488d1 SH	35	if (dev->ethtool_ops && dev->ethtool_ops->get_settings) {
	36	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET, };
	37
	38	if (!dev->ethtool_ops->get_settings(dev, &ecmd)) {
61a44b9c	39	switch(ecmd.speed) {
61a44b9c MW	40	case SPEED_10000:
61a44b9c MW	41	return 2;
b4a488d1 SH	42	case SPEED_1000:
	43	return 4;
	44	case SPEED_100:
	45	return 19;
61a44b9c MW	46	case SPEED_10:
	47	return 100;
	48	}
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 SH	62
	63	/*
	64	* Check for port carrier transistions.
	65	* Called from work queue to allow for calling functions that
	66	* might sleep (such as speed check), and to debounce.
	67	*/
269def7c	68	void br_port_carrier_check(struct net_bridge_port *p)
4433f420	69	{
269def7c SH	70	struct net_device *dev = p->dev;
269def7c SH	71	struct net_bridge *br = p->br;
6e86b890 SH	72
	73	if (netif_carrier_ok(dev))
	74	p->path_cost = port_cost(dev);
	75
269def7c	76	if (netif_running(br->dev)) {
6e86b890 SH	77	spin_lock_bh(&br->lock);
	78	if (netif_carrier_ok(dev)) {
	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	}
6e86b890	85	spin_unlock_bh(&br->lock);
4433f420	86	}
4433f420 SH	87	}
4433f420 SH	88
bab1deea SH	89	static void release_nbp(struct kobject *kobj)
	90	{
	91	struct net_bridge_port *p
	92	= container_of(kobj, struct net_bridge_port, kobj);
	93	kfree(p);
	94	}
	95
	96	static struct kobj_type brport_ktype = {
	97	#ifdef CONFIG_SYSFS
	98	.sysfs_ops = &brport_sysfs_ops,
	99	#endif
	100	.release = release_nbp,
	101	};
	102
1da177e4 LT	103	static void destroy_nbp(struct net_bridge_port *p)
	104	{
	105	struct net_device *dev = p->dev;
	106
1da177e4 LT	107	p->br = NULL;
	108	p->dev = NULL;
	109	dev_put(dev);
	110
bab1deea	111	kobject_put(&p->kobj);
1da177e4 LT	112	}
	113
	114	static void destroy_nbp_rcu(struct rcu_head *head)
	115	{
	116	struct net_bridge_port *p =
	117	container_of(head, struct net_bridge_port, rcu);
	118	destroy_nbp(p);
	119	}
	120
3f4cfc2d SH	121	/* Delete port(interface) from bridge is done in two steps.
	122	* via RCU. First step, marks device as down. That deletes
	123	* all the timers and stops new packets from flowing through.
	124	*
	125	* Final cleanup doesn't occur until after all CPU's finished
	126	* processing packets.
	127	*
	128	* Protected from multiple admin operations by RTNL mutex
	129	*/
1da177e4 LT	130	static void del_nbp(struct net_bridge_port *p)
	131	{
	132	struct net_bridge *br = p->br;
	133	struct net_device *dev = p->dev;
	134
43b98c4a	135	sysfs_remove_link(br->ifobj, dev->name);
bab1deea	136
1da177e4 LT	137	dev_set_promiscuity(dev, -1);
	138
	139	spin_lock_bh(&br->lock);
	140	br_stp_disable_port(p);
	141	spin_unlock_bh(&br->lock);
	142
b86c4503 SH	143	br_ifinfo_notify(RTM_DELLINK, p);
b86c4503 SH	144
1a620698	145	br_fdb_delete_by_port(br, p, 1);
1da177e4 LT	146
	147	list_del_rcu(&p->list);
	148
b3f1be4b SH	149	rcu_assign_pointer(dev->br_port, NULL);
b3f1be4b SH	150
3fe2d7c7 HX	151	br_multicast_del_port(p);
3fe2d7c7 HX	152
125a12cc	153	kobject_uevent(&p->kobj, KOBJ_REMOVE);
bab1deea SH	154	kobject_del(&p->kobj);
bab1deea SH	155
1da177e4 LT	156	call_rcu(&p->rcu, destroy_nbp_rcu);
	157	}
	158
	159	/* called with RTNL */
8c56ba05	160	static void del_br(struct net_bridge br, struct list_head head)
1da177e4 LT	161	{
	162	struct net_bridge_port p, n;
	163
	164	list_for_each_entry_safe(p, n, &br->port_list, list) {
1da177e4 LT	165	del_nbp(p);
	166	}
	167
	168	del_timer_sync(&br->gc_timer);
	169
	170	br_sysfs_delbr(br->dev);
8c56ba05	171	unregister_netdevice_queue(br->dev, head);
1da177e4 LT	172	}
1da177e4 LT	173
4aa678ba	174	static struct net_device new_bridge_dev(struct net net, const char *name)
1da177e4 LT	175	{
	176	struct net_bridge *br;
	177	struct net_device *dev;
	178
	179	dev = alloc_netdev(sizeof(struct net_bridge), name,
	180	br_dev_setup);
9d6f229f	181
1da177e4 LT	182	if (!dev)
1da177e4 LT	183	return NULL;
4aa678ba	184	dev_net_set(dev, net);
1da177e4 LT	185
	186	br = netdev_priv(dev);
	187	br->dev = dev;
	188
	189	spin_lock_init(&br->lock);
	190	INIT_LIST_HEAD(&br->port_list);
	191	spin_lock_init(&br->hash_lock);
	192
	193	br->bridge_id.prio[0] = 0x80;
	194	br->bridge_id.prio[1] = 0x00;
cee48541 SH	195
cee48541 SH	196	memcpy(br->group_addr, br_group_address, ETH_ALEN);
1da177e4	197
edb5e46f	198	br->feature_mask = dev->features;
9cde0708	199	br->stp_enabled = BR_NO_STP;
1da177e4 LT	200	br->designated_root = br->bridge_id;
	201	br->root_path_cost = 0;
	202	br->root_port = 0;
	203	br->bridge_max_age = br->max_age = 20 * HZ;
	204	br->bridge_hello_time = br->hello_time = 2 * HZ;
	205	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
	206	br->topology_change = 0;
	207	br->topology_change_detected = 0;
	208	br->ageing_time = 300 * HZ;
4adf0af6 SW	209
	210	br_netfilter_rtable_init(br);
	211
1da177e4	212	br_stp_timer_init(br);
3fe2d7c7	213	br_multicast_init(br);
1da177e4 LT	214
	215	return dev;
	216	}
	217
	218	/* find an available port number */
	219	static int find_portno(struct net_bridge *br)
	220	{
	221	int index;
	222	struct net_bridge_port *p;
	223	unsigned long *inuse;
	224
3b781fa1	225	inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
1da177e4 LT	226	GFP_KERNEL);
	227	if (!inuse)
	228	return -ENOMEM;
	229
1da177e4 LT	230	set_bit(0, inuse); /* zero is reserved */
	231	list_for_each_entry(p, &br->port_list, list) {
	232	set_bit(p->port_no, inuse);
	233	}
	234	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	235	kfree(inuse);
	236
	237	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
	238	}
	239
4433f420	240	/* called with RTNL but without bridge lock */
9d6f229f	241	static struct net_bridge_port new_nbp(struct net_bridge br,
4433f420	242	struct net_device *dev)
1da177e4 LT	243	{
	244	int index;
	245	struct net_bridge_port *p;
9d6f229f	246
1da177e4 LT	247	index = find_portno(br);
	248	if (index < 0)
	249	return ERR_PTR(index);
	250
cee48541	251	p = kzalloc(sizeof(*p), GFP_KERNEL);
1da177e4 LT	252	if (p == NULL)
	253	return ERR_PTR(-ENOMEM);
	254
1da177e4 LT	255	p->br = br;
	256	dev_hold(dev);
	257	p->dev = dev;
4433f420	258	p->path_cost = port_cost(dev);
9d6f229f	259	p->priority = 0x8000 >> BR_PORT_BITS;
1da177e4	260	p->port_no = index;
3982d3d2	261	p->flags = 0;
1da177e4 LT	262	br_init_port(p);
1da177e4 LT	263	p->state = BR_STATE_DISABLED;
d32439c0	264	br_stp_port_timer_init(p);
3fe2d7c7	265	br_multicast_add_port(p);
1da177e4 LT	266
	267	return p;
	268	}
	269
384912ed MH	270	static struct device_type br_type = {
	271	.name = "bridge",
	272	};
	273
4aa678ba	274	int br_add_bridge(struct net net, const char name)
1da177e4 LT	275	{
	276	struct net_device *dev;
	277	int ret;
	278
4aa678ba	279	dev = new_bridge_dev(net, name);
9d6f229f	280	if (!dev)
1da177e4 LT	281	return -ENOMEM;
	282
	283	rtnl_lock();
	284	if (strchr(dev->name, '%')) {
	285	ret = dev_alloc_name(dev, dev->name);
e340a90e PE	286	if (ret < 0)
e340a90e PE	287	goto out_free;
1da177e4 LT	288	}
1da177e4 LT	289
384912ed MH	290	SET_NETDEV_DEVTYPE(dev, &br_type);
384912ed MH	291
1da177e4	292	ret = register_netdevice(dev);
e340a90e PE	293	if (ret)
e340a90e PE	294	goto out_free;
1da177e4	295
1da177e4	296	ret = br_sysfs_addbr(dev);
ac05202e	297	if (ret)
36485707 JB	298	unregister_netdevice(dev);
36485707 JB	299	out:
1da177e4	300	rtnl_unlock();
ac05202e	301	return ret;
e340a90e PE	302
	303	out_free:
	304	free_netdev(dev);
	305	goto out;
1da177e4 LT	306	}
1da177e4 LT	307
4aa678ba	308	int br_del_bridge(struct net net, const char name)
1da177e4 LT	309	{
	310	struct net_device *dev;
	311	int ret = 0;
	312
	313	rtnl_lock();
4aa678ba	314	dev = __dev_get_by_name(net, name);
9d6f229f	315	if (dev == NULL)
1da177e4 LT	316	ret = -ENXIO; /* Could not find device */
	317
	318	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
	319	/* Attempt to delete non bridge device! */
	320	ret = -EPERM;
	321	}
	322
	323	else if (dev->flags & IFF_UP) {
	324	/* Not shutdown yet. */
	325	ret = -EBUSY;
9d6f229f	326	}
1da177e4	327
9d6f229f	328	else
8c56ba05	329	del_br(netdev_priv(dev), NULL);
1da177e4 LT	330
	331	rtnl_unlock();
	332	return ret;
	333	}
	334
46f25dff	335	/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1da177e4 LT	336	int br_min_mtu(const struct net_bridge *br)
	337	{
	338	const struct net_bridge_port *p;
	339	int mtu = 0;
	340
	341	ASSERT_RTNL();
	342
	343	if (list_empty(&br->port_list))
46f25dff	344	mtu = ETH_DATA_LEN;
1da177e4 LT	345	else {
	346	list_for_each_entry(p, &br->port_list, list) {
	347	if (!mtu \|\| p->dev->mtu < mtu)
	348	mtu = p->dev->mtu;
	349	}
	350	}
	351	return mtu;
	352	}
	353
81d35307 SH	354	/*
	355	* Recomputes features using slave's features
	356	*/
	357	void br_features_recompute(struct net_bridge *br)
	358	{
	359	struct net_bridge_port *p;
b63365a2	360	unsigned long features, mask;
81d35307	361
b63365a2 HX	362	features = mask = br->feature_mask;
	363	if (list_empty(&br->port_list))
	364	goto done;
	365
	366	features &= ~NETIF_F_ONE_FOR_ALL;
81d35307 SH	367
81d35307 SH	368	list_for_each_entry(p, &br->port_list, list) {
b63365a2 HX	369	features = netdev_increment_features(features,
b63365a2 HX	370	p->dev->features, mask);
81d35307 SH	371	}
81d35307 SH	372
b63365a2 HX	373	done:
b63365a2 HX	374	br->dev->features = netdev_fix_features(features, NULL);
81d35307 SH	375	}
81d35307 SH	376
1da177e4 LT	377	/* called with RTNL */
	378	int br_add_if(struct net_bridge br, struct net_device dev)
	379	{
	380	struct net_bridge_port *p;
	381	int err = 0;
	382
1056bd51 SH	383	/* Don't allow bridging non-ethernet like devices */
	384	if ((dev->flags & IFF_LOOPBACK) \|\|
	385	dev->type != ARPHRD_ETHER \|\| dev->addr_len != ETH_ALEN)
1da177e4 LT	386	return -EINVAL;
1da177e4 LT	387
1056bd51	388	/* No bridging of bridges */
00829823	389	if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
1da177e4 LT	390	return -ELOOP;
1da177e4 LT	391
1056bd51	392	/* Device is already being bridged */
1da177e4 LT	393	if (dev->br_port != NULL)
	394	return -EBUSY;
	395
ad4bb6f8 JB	396	/* No bridging devices that dislike that (e.g. wireless) */
	397	if (dev->priv_flags & IFF_DONT_BRIDGE)
	398	return -EOPNOTSUPP;
	399
bab1deea SH	400	p = new_nbp(br, dev);
bab1deea SH	401	if (IS_ERR(p))
1da177e4 LT	402	return PTR_ERR(p);
1da177e4 LT	403
bc3f9076 WC	404	err = dev_set_promiscuity(dev, 1);
	405	if (err)
	406	goto put_back;
	407
e32cc736 GKH	408	err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
e32cc736 GKH	409	SYSFS_BRIDGE_PORT_ATTR);
bab1deea SH	410	if (err)
bab1deea SH	411	goto err0;
1da177e4	412
9d6f229f	413	err = br_fdb_insert(br, p, dev->dev_addr);
bab1deea SH	414	if (err)
bab1deea SH	415	goto err1;
1da177e4	416
bab1deea SH	417	err = br_sysfs_addif(p);
	418	if (err)
	419	goto err2;
1da177e4	420
bab1deea	421	rcu_assign_pointer(dev->br_port, p);
0187bdfb	422	dev_disable_lro(dev);
bab1deea SH	423
	424	list_add_rcu(&p->list, &br->port_list);
	425
	426	spin_lock_bh(&br->lock);
	427	br_stp_recalculate_bridge_id(br);
	428	br_features_recompute(br);
de79059e AS	429
	430	if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
	431	(br->dev->flags & IFF_UP))
	432	br_stp_enable_port(p);
bab1deea SH	433	spin_unlock_bh(&br->lock);
bab1deea SH	434
b86c4503 SH	435	br_ifinfo_notify(RTM_NEWLINK, p);
b86c4503 SH	436
bab1deea	437	dev_set_mtu(br->dev, br_min_mtu(br));
269def7c	438
bab1deea	439	kobject_uevent(&p->kobj, KOBJ_ADD);
1da177e4	440
bab1deea SH	441	return 0;
bab1deea SH	442	err2:
1a620698	443	br_fdb_delete_by_port(br, p, 1);
bab1deea	444	err1:
c587aea9	445	kobject_put(&p->kobj);
30df94f8	446	p = NULL; /* kobject_put frees */
bab1deea	447	err0:
bc3f9076	448	dev_set_promiscuity(dev, -1);
43af8532 VL	449	put_back:
43af8532 VL	450	dev_put(dev);
bc3f9076	451	kfree(p);
1da177e4 LT	452	return err;
	453	}
	454
	455	/* called with RTNL */
	456	int br_del_if(struct net_bridge br, struct net_device dev)
	457	{
	458	struct net_bridge_port *p = dev->br_port;
9d6f229f YH	459
9d6f229f YH	460	if (!p \|\| p->br != br)
1da177e4 LT	461	return -EINVAL;
1da177e4 LT	462
1da177e4 LT	463	del_nbp(p);
	464
	465	spin_lock_bh(&br->lock);
	466	br_stp_recalculate_bridge_id(br);
81d35307	467	br_features_recompute(br);
1da177e4 LT	468	spin_unlock_bh(&br->lock);
	469
	470	return 0;
	471	}
	472
2c8c1e72	473	void __net_exit br_net_exit(struct net *net)
1da177e4	474	{
ab1b2046	475	struct net_device *dev;
8c56ba05	476	LIST_HEAD(list);
1da177e4 LT	477
1da177e4 LT	478	rtnl_lock();
8c56ba05 ED	479	for_each_netdev(net, dev)
	480	if (dev->priv_flags & IFF_EBRIDGE)
	481	del_br(netdev_priv(dev), &list);
	482
	483	unregister_netdevice_many(&list);
1da177e4 LT	484	rtnl_unlock();
	485
	486	}