[linux-block.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 <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);
	}

	br_vlan_flush(br);
	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;

	err = br_netpoll_enable(p, GFP_KERNEL);
	if (err)
		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);

	if (br->dev->needed_headroom < dev->needed_headroom)
		br->dev->needed_headroom = dev->needed_headroom;

	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 <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	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
b4e09b29	175	br_vlan_flush(br);
1da177e4 LT	176	del_timer_sync(&br->gc_timer);
	177
	178	br_sysfs_delbr(br->dev);
8c56ba05	179	unregister_netdevice_queue(br->dev, head);
1da177e4 LT	180	}
1da177e4 LT	181
1da177e4 LT	182	/* find an available port number */
	183	static int find_portno(struct net_bridge *br)
	184	{
	185	int index;
	186	struct net_bridge_port *p;
	187	unsigned long *inuse;
	188
3b781fa1	189	inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
1da177e4 LT	190	GFP_KERNEL);
	191	if (!inuse)
	192	return -ENOMEM;
	193
1da177e4 LT	194	set_bit(0, inuse); /* zero is reserved */
	195	list_for_each_entry(p, &br->port_list, list) {
	196	set_bit(p->port_no, inuse);
	197	}
	198	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	199	kfree(inuse);
	200
	201	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
	202	}
	203
4433f420	204	/* called with RTNL but without bridge lock */
9d6f229f	205	static struct net_bridge_port new_nbp(struct net_bridge br,
4433f420	206	struct net_device *dev)
1da177e4 LT	207	{
	208	int index;
	209	struct net_bridge_port *p;
9d6f229f	210
1da177e4 LT	211	index = find_portno(br);
	212	if (index < 0)
	213	return ERR_PTR(index);
	214
cee48541	215	p = kzalloc(sizeof(*p), GFP_KERNEL);
1da177e4 LT	216	if (p == NULL)
	217	return ERR_PTR(-ENOMEM);
	218
1da177e4 LT	219	p->br = br;
	220	dev_hold(dev);
	221	p->dev = dev;
4433f420	222	p->path_cost = port_cost(dev);
9d6f229f	223	p->priority = 0x8000 >> BR_PORT_BITS;
1da177e4	224	p->port_no = index;
867a5943	225	p->flags = BR_LEARNING \| BR_FLOOD;
1da177e4 LT	226	br_init_port(p);
1da177e4 LT	227	p->state = BR_STATE_DISABLED;
d32439c0	228	br_stp_port_timer_init(p);
3fe2d7c7	229	br_multicast_add_port(p);
1da177e4 LT	230
	231	return p;
	232	}
	233
4aa678ba	234	int br_add_bridge(struct net net, const char name)
1da177e4 LT	235	{
1da177e4 LT	236	struct net_device *dev;
11f3a6bd	237	int res;
1da177e4	238
bb900b27	239	dev = alloc_netdev(sizeof(struct net_bridge), name,
	240	br_dev_setup);
	241
9d6f229f	242	if (!dev)
1da177e4 LT	243	return -ENOMEM;
1da177e4 LT	244
bb900b27	245	dev_net_set(dev, net);
149ddd83	246	dev->rtnl_link_ops = &br_link_ops;
e340a90e	247
11f3a6bd ED	248	res = register_netdev(dev);
	249	if (res)
	250	free_netdev(dev);
	251	return res;
1da177e4 LT	252	}
1da177e4 LT	253
4aa678ba	254	int br_del_bridge(struct net net, const char name)
1da177e4 LT	255	{
	256	struct net_device *dev;
	257	int ret = 0;
	258
	259	rtnl_lock();
4aa678ba	260	dev = __dev_get_by_name(net, name);
9d6f229f	261	if (dev == NULL)
1da177e4 LT	262	ret = -ENXIO; /* Could not find device */
	263
	264	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
	265	/* Attempt to delete non bridge device! */
	266	ret = -EPERM;
	267	}
	268
	269	else if (dev->flags & IFF_UP) {
	270	/* Not shutdown yet. */
	271	ret = -EBUSY;
9d6f229f	272	}
1da177e4	273
9d6f229f	274	else
1ce5cce8	275	br_dev_delete(dev, NULL);
1da177e4 LT	276
	277	rtnl_unlock();
	278	return ret;
	279	}
	280
46f25dff	281	/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1da177e4 LT	282	int br_min_mtu(const struct net_bridge *br)
	283	{
	284	const struct net_bridge_port *p;
	285	int mtu = 0;
	286
	287	ASSERT_RTNL();
	288
	289	if (list_empty(&br->port_list))
46f25dff	290	mtu = ETH_DATA_LEN;
1da177e4 LT	291	else {
	292	list_for_each_entry(p, &br->port_list, list) {
	293	if (!mtu \|\| p->dev->mtu < mtu)
	294	mtu = p->dev->mtu;
	295	}
	296	}
	297	return mtu;
	298	}
	299
81d35307 SH	300	/*
	301	* Recomputes features using slave's features
	302	*/
c8f44aff MM	303	netdev_features_t br_features_recompute(struct net_bridge *br,
c8f44aff MM	304	netdev_features_t features)
81d35307 SH	305	{
81d35307 SH	306	struct net_bridge_port *p;
c8f44aff	307	netdev_features_t mask;
81d35307	308
b63365a2	309	if (list_empty(&br->port_list))
c4d27ef9	310	return features;
b63365a2	311
c4d27ef9	312	mask = features;
b63365a2	313	features &= ~NETIF_F_ONE_FOR_ALL;
81d35307 SH	314
81d35307 SH	315	list_for_each_entry(p, &br->port_list, list) {
b63365a2 HX	316	features = netdev_increment_features(features,
b63365a2 HX	317	p->dev->features, mask);
81d35307 SH	318	}
81d35307 SH	319
c4d27ef9	320	return features;
81d35307 SH	321	}
81d35307 SH	322
1da177e4 LT	323	/* called with RTNL */
	324	int br_add_if(struct net_bridge br, struct net_device dev)
	325	{
	326	struct net_bridge_port *p;
	327	int err = 0;
edf947f1	328	bool changed_addr;
1da177e4	329
1056bd51 SH	330	/* Don't allow bridging non-ethernet like devices */
1056bd51 SH	331	if ((dev->flags & IFF_LOOPBACK) \|\|
77f98598	332	dev->type != ARPHRD_ETHER \|\| dev->addr_len != ETH_ALEN \|\|
77f98598	333	!is_valid_ether_addr(dev->dev_addr))
1da177e4 LT	334	return -EINVAL;
1da177e4 LT	335
1056bd51	336	/* No bridging of bridges */
00829823	337	if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
1da177e4 LT	338	return -ELOOP;
1da177e4 LT	339
1056bd51	340	/* Device is already being bridged */
f350a0a8	341	if (br_port_exists(dev))
1da177e4 LT	342	return -EBUSY;
1da177e4 LT	343
ad4bb6f8 JB	344	/* No bridging devices that dislike that (e.g. wireless) */
	345	if (dev->priv_flags & IFF_DONT_BRIDGE)
	346	return -EOPNOTSUPP;
	347
bab1deea SH	348	p = new_nbp(br, dev);
bab1deea SH	349	if (IS_ERR(p))
1da177e4 LT	350	return PTR_ERR(p);
1da177e4 LT	351
bb8ed630 AW	352	call_netdevice_notifiers(NETDEV_JOIN, dev);
bb8ed630 AW	353
bc3f9076 WC	354	err = dev_set_promiscuity(dev, 1);
	355	if (err)
	356	goto put_back;
	357
e32cc736 GKH	358	err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
e32cc736 GKH	359	SYSFS_BRIDGE_PORT_ATTR);
bab1deea SH	360	if (err)
bab1deea SH	361	goto err1;
1da177e4	362
bab1deea SH	363	err = br_sysfs_addif(p);
	364	if (err)
	365	goto err2;
1da177e4	366
93d8bf9f	367	err = br_netpoll_enable(p, GFP_KERNEL);
93d8bf9f	368	if (err)
91d2c34a HX	369	goto err3;
91d2c34a HX	370
74fdd93f	371	err = netdev_master_upper_dev_link(dev, br->dev);
ab95bfe0	372	if (err)
9b1536c4	373	goto err4;
f350a0a8	374
afc6151a JP	375	err = netdev_rx_handler_register(dev, br_handle_frame, p);
afc6151a JP	376	if (err)
9b1536c4	377	goto err5;
afc6151a	378
f350a0a8	379	dev->priv_flags \|= IFF_BRIDGE_PORT;
ab95bfe0	380
0187bdfb	381	dev_disable_lro(dev);
bab1deea SH	382
	383	list_add_rcu(&p->list, &br->port_list);
	384
c4d27ef9 MM	385	netdev_update_features(br->dev);
c4d27ef9 MM	386
fd094808 FF	387	if (br->dev->needed_headroom < dev->needed_headroom)
	388	br->dev->needed_headroom = dev->needed_headroom;
	389
bab1deea	390	spin_lock_bh(&br->lock);
edf947f1	391	changed_addr = br_stp_recalculate_bridge_id(br);
de79059e	392
576eb625	393	if (netif_running(dev) && netif_oper_up(dev) &&
de79059e AS	394	(br->dev->flags & IFF_UP))
de79059e AS	395	br_stp_enable_port(p);
bab1deea SH	396	spin_unlock_bh(&br->lock);
bab1deea SH	397
b86c4503 SH	398	br_ifinfo_notify(RTM_NEWLINK, p);
b86c4503 SH	399
edf947f1	400	if (changed_addr)
56139fc5	401	call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
edf947f1	402
bab1deea	403	dev_set_mtu(br->dev, br_min_mtu(br));
269def7c	404
bc9a25d2	405	if (br_fdb_insert(br, p, dev->dev_addr, 0))
77f98598	406	netdev_err(dev, "failed insert local address bridge forwarding table\n");
77f98598	407
bab1deea	408	kobject_uevent(&p->kobj, KOBJ_ADD);
1da177e4	409
bab1deea	410	return 0;
afc6151a	411
9b1536c4	412	err5:
74fdd93f	413	netdev_upper_dev_unlink(dev, br->dev);
9b1536c4 G	414	err4:
9b1536c4 G	415	br_netpoll_disable(p);
91d2c34a HX	416	err3:
91d2c34a HX	417	sysfs_remove_link(br->ifobj, p->dev->name);
bab1deea	418	err2:
c587aea9	419	kobject_put(&p->kobj);
30df94f8	420	p = NULL; /* kobject_put frees */
77f98598	421	err1:
bc3f9076	422	dev_set_promiscuity(dev, -1);
43af8532 VL	423	put_back:
43af8532 VL	424	dev_put(dev);
bc3f9076	425	kfree(p);
1da177e4 LT	426	return err;
	427	}
	428
	429	/* called with RTNL */
	430	int br_del_if(struct net_bridge br, struct net_device dev)
	431	{
f350a0a8	432	struct net_bridge_port *p;
9be6dd65	433	bool changed_addr;
f350a0a8	434
ec1e5610	435	p = br_port_get_rtnl(dev);
b5ed54e9	436	if (!p \|\| p->br != br)
1da177e4 LT	437	return -EINVAL;
1da177e4 LT	438
d30362c0 AW	439	/* Since more than one interface can be attached to a bridge,
	440	* there still maybe an alternate path for netconsole to use;
	441	* therefore there is no reason for a NETDEV_RELEASE event.
	442	*/
1da177e4 LT	443	del_nbp(p);
	444
	445	spin_lock_bh(&br->lock);
9be6dd65	446	changed_addr = br_stp_recalculate_bridge_id(br);
1da177e4 LT	447	spin_unlock_bh(&br->lock);
1da177e4 LT	448
9be6dd65 AW	449	if (changed_addr)
	450	call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
	451
c4d27ef9 MM	452	netdev_update_features(br->dev);
c4d27ef9 MM	453
1da177e4 LT	454	return 0;
	455	}
	456
2c8c1e72	457	void __net_exit br_net_exit(struct net *net)
1da177e4	458	{
ab1b2046	459	struct net_device *dev;
8c56ba05	460	LIST_HEAD(list);
1da177e4 LT	461
1da177e4 LT	462	rtnl_lock();
8c56ba05 ED	463	for_each_netdev(net, dev)
8c56ba05 ED	464	if (dev->priv_flags & IFF_EBRIDGE)
1ce5cce8	465	br_dev_delete(dev, &list);
8c56ba05 ED	466
8c56ba05 ED	467	unregister_netdevice_many(&list);
1da177e4 LT	468	rtnl_unlock();
	469
	470	}