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

/*
 *	Userspace interface
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<buytenh@gnu.org>
 *
 *	$Id: br_if.c,v 1.7 2001/12/24 00:59:55 davem Exp $
 *
 *	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 <net/sock.h>

#include "br_private.h"

/*
 * Determine initial path cost based on speed.
 * using recommendations from 802.1d standard
 *
 * Need to simulate user ioctl because not all device's that support
 * ethtool, use ethtool_ops.  Also, since driver might sleep need to
 * not be holding any locks.
 */
static int port_cost(struct net_device *dev)
{
	struct ethtool_cmd ecmd = { ETHTOOL_GSET };
	struct ifreq ifr;
	mm_segment_t old_fs;
	int err;

	strncpy(ifr.ifr_name, dev->name, IFNAMSIZ);
	ifr.ifr_data = (void __user *) &ecmd;

	old_fs = get_fs();
	set_fs(KERNEL_DS);
	err = dev_ethtool(&ifr);
	set_fs(old_fs);

	if (!err) {
		switch(ecmd.speed) {
		case SPEED_100:
			return 19;
		case SPEED_1000:
			return 4;
		case SPEED_10000:
			return 2;
		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.
 */
static void port_carrier_check(struct work_struct *work)
{
	struct net_bridge_port *p;
	struct net_device *dev;
	struct net_bridge *br;

	dev = container_of(work, struct net_bridge_port,
			   carrier_check.work)->dev;
	work_release(work);

	rtnl_lock();
	p = dev->br_port;
	if (!p)
		goto done;
	br = p->br;

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

	if (br->dev->flags & IFF_UP) {
		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);
	}
done:
	dev_put(dev);
	rtnl_unlock();
}

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);

	if (cancel_delayed_work(&p->carrier_check))
		dev_put(dev);

	spin_lock_bh(&br->lock);
	br_stp_disable_port(p);
	spin_unlock_bh(&br->lock);

	br_fdb_delete_by_port(br, p, 1);

	list_del_rcu(&p->list);

	rcu_assign_pointer(dev->br_port, NULL);

	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 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(br->dev);
}

static struct net_device *new_bridge_dev(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;

	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 = 0;
	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;
	INIT_LIST_HEAD(&br->age_list);

	br_stp_timer_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;
	br_init_port(p);
	p->state = BR_STATE_DISABLED;
	INIT_DELAYED_WORK_NAR(&p->carrier_check, port_carrier_check);
	br_stp_port_timer_init(p);

	kobject_init(&p->kobj);
	kobject_set_name(&p->kobj, SYSFS_BRIDGE_PORT_ATTR);
	p->kobj.ktype = &brport_ktype;
	p->kobj.parent = &(dev->dev.kobj);
	p->kobj.kset = NULL;

	return p;
}

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

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

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

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

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

int br_del_bridge(const char *name)
{
	struct net_device *dev;
	int ret = 0;

	rtnl_lock();
	dev = __dev_get_by_name(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));

	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, checksum;

	checksum = br->feature_mask & NETIF_F_ALL_CSUM ? NETIF_F_NO_CSUM : 0;
	features = br->feature_mask & ~NETIF_F_ALL_CSUM;

	list_for_each_entry(p, &br->port_list, list) {
		unsigned long feature = p->dev->features;

		if (checksum & NETIF_F_NO_CSUM && !(feature & NETIF_F_NO_CSUM))
			checksum ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM;
		if (checksum & NETIF_F_HW_CSUM && !(feature & NETIF_F_HW_CSUM))
			checksum ^= NETIF_F_HW_CSUM | NETIF_F_IP_CSUM;
		if (!(feature & NETIF_F_IP_CSUM))
			checksum = 0;

		if (feature & NETIF_F_GSO)
			feature |= NETIF_F_GSO_SOFTWARE;
		feature |= NETIF_F_GSO;

		features &= feature;
	}

	if (!(checksum & NETIF_F_ALL_CSUM))
		features &= ~NETIF_F_SG;
	if (!(features & NETIF_F_SG))
		features &= ~NETIF_F_GSO_MASK;

	br->dev->features = features | checksum | NETIF_F_LLTX |
			    NETIF_F_GSO_ROBUST;
}

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

	if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER)
		return -EINVAL;

	if (dev->hard_start_xmit == br_dev_xmit)
		return -ELOOP;

	if (dev->br_port != NULL)
		return -EBUSY;

	p = new_nbp(br, dev);
	if (IS_ERR(p))
		return PTR_ERR(p);

	err = kobject_add(&p->kobj);
	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_set_promiscuity(dev, 1);

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

	spin_lock_bh(&br->lock);
	br_stp_recalculate_bridge_id(br);
	br_features_recompute(br);
	if (schedule_delayed_work(&p->carrier_check, BR_PORT_DEBOUNCE))
		dev_hold(dev);

	spin_unlock_bh(&br->lock);

	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_del(&p->kobj);
err0:
	kobject_put(&p->kobj);
	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 __exit br_cleanup_bridges(void)
{
	struct net_device *dev, *nxt;

	rtnl_lock();
	for (dev = dev_base; dev; dev = nxt) {
		nxt = dev->next;
		if (dev->priv_flags & IFF_EBRIDGE)
			del_br(dev->priv);
	}
	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	*
	8	* $Id: br_if.c,v 1.7 2001/12/24 00:59:55 davem Exp $
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version
	13	* 2 of the License, or (at your option) any later version.
	14	*/
	15
	16	#include <linux/kernel.h>
	17	#include <linux/netdevice.h>
	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>
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	*
	32	* Need to simulate user ioctl because not all device's that support
	33	* ethtool, use ethtool_ops. Also, since driver might sleep need to
	34	* not be holding any locks.
	35	*/
4433f420	36	static int port_cost(struct net_device *dev)
1da177e4	37	{
1da177e4 LT	38	struct ethtool_cmd ecmd = { ETHTOOL_GSET };
	39	struct ifreq ifr;
	40	mm_segment_t old_fs;
	41	int err;
	42
	43	strncpy(ifr.ifr_name, dev->name, IFNAMSIZ);
	44	ifr.ifr_data = (void __user *) &ecmd;
	45
	46	old_fs = get_fs();
	47	set_fs(KERNEL_DS);
	48	err = dev_ethtool(&ifr);
	49	set_fs(old_fs);
9d6f229f	50
1da177e4 LT	51	if (!err) {
	52	switch(ecmd.speed) {
	53	case SPEED_100:
	54	return 19;
	55	case SPEED_1000:
	56	return 4;
	57	case SPEED_10000:
	58	return 2;
	59	case SPEED_10:
	60	return 100;
1da177e4 LT	61	}
	62	}
	63
	64	/* Old silly heuristics based on name */
	65	if (!strncmp(dev->name, "lec", 3))
	66	return 7;
	67
	68	if (!strncmp(dev->name, "plip", 4))
	69	return 2500;
	70
	71	return 100; /* assume old 10Mbps */
	72	}
	73
4433f420 SH	74
	75	/*
	76	* Check for port carrier transistions.
	77	* Called from work queue to allow for calling functions that
	78	* might sleep (such as speed check), and to debounce.
	79	*/
c4028958	80	static void port_carrier_check(struct work_struct *work)
4433f420	81	{
b3f1be4b	82	struct net_bridge_port *p;
c4028958	83	struct net_device *dev;
6e86b890	84	struct net_bridge *br;
4433f420	85
c4028958 DH	86	dev = container_of(work, struct net_bridge_port,
	87	carrier_check.work)->dev;
	88	work_release(work);
	89
4433f420	90	rtnl_lock();
b3f1be4b SH	91	p = dev->br_port;
	92	if (!p)
	93	goto done;
6e86b890 SH	94	br = p->br;
	95
	96	if (netif_carrier_ok(dev))
	97	p->path_cost = port_cost(dev);
	98
	99	if (br->dev->flags & IFF_UP) {
	100	spin_lock_bh(&br->lock);
	101	if (netif_carrier_ok(dev)) {
	102	if (p->state == BR_STATE_DISABLED)
	103	br_stp_enable_port(p);
	104	} else {
	105	if (p->state != BR_STATE_DISABLED)
	106	br_stp_disable_port(p);
4433f420	107	}
6e86b890	108	spin_unlock_bh(&br->lock);
4433f420	109	}
b3f1be4b	110	done:
a10d567c	111	dev_put(dev);
4433f420 SH	112	rtnl_unlock();
	113	}
	114
bab1deea SH	115	static void release_nbp(struct kobject *kobj)
	116	{
	117	struct net_bridge_port *p
	118	= container_of(kobj, struct net_bridge_port, kobj);
	119	kfree(p);
	120	}
	121
	122	static struct kobj_type brport_ktype = {
	123	#ifdef CONFIG_SYSFS
	124	.sysfs_ops = &brport_sysfs_ops,
	125	#endif
	126	.release = release_nbp,
	127	};
	128
1da177e4 LT	129	static void destroy_nbp(struct net_bridge_port *p)
	130	{
	131	struct net_device *dev = p->dev;
	132
1da177e4 LT	133	p->br = NULL;
	134	p->dev = NULL;
	135	dev_put(dev);
	136
bab1deea	137	kobject_put(&p->kobj);
1da177e4 LT	138	}
	139
	140	static void destroy_nbp_rcu(struct rcu_head *head)
	141	{
	142	struct net_bridge_port *p =
	143	container_of(head, struct net_bridge_port, rcu);
	144	destroy_nbp(p);
	145	}
	146
3f4cfc2d SH	147	/* Delete port(interface) from bridge is done in two steps.
	148	* via RCU. First step, marks device as down. That deletes
	149	* all the timers and stops new packets from flowing through.
	150	*
	151	* Final cleanup doesn't occur until after all CPU's finished
	152	* processing packets.
	153	*
	154	* Protected from multiple admin operations by RTNL mutex
	155	*/
1da177e4 LT	156	static void del_nbp(struct net_bridge_port *p)
	157	{
	158	struct net_bridge *br = p->br;
	159	struct net_device *dev = p->dev;
	160
bab1deea SH	161	sysfs_remove_link(&br->ifobj, dev->name);
bab1deea SH	162
1da177e4 LT	163	dev_set_promiscuity(dev, -1);
1da177e4 LT	164
a10d567c JP	165	if (cancel_delayed_work(&p->carrier_check))
a10d567c JP	166	dev_put(dev);
4433f420	167
1da177e4 LT	168	spin_lock_bh(&br->lock);
	169	br_stp_disable_port(p);
	170	spin_unlock_bh(&br->lock);
	171
1a620698	172	br_fdb_delete_by_port(br, p, 1);
1da177e4 LT	173
	174	list_del_rcu(&p->list);
	175
b3f1be4b SH	176	rcu_assign_pointer(dev->br_port, NULL);
b3f1be4b SH	177
125a12cc	178	kobject_uevent(&p->kobj, KOBJ_REMOVE);
bab1deea SH	179	kobject_del(&p->kobj);
bab1deea SH	180
1da177e4 LT	181	call_rcu(&p->rcu, destroy_nbp_rcu);
	182	}
	183
	184	/* called with RTNL */
	185	static void del_br(struct net_bridge *br)
	186	{
	187	struct net_bridge_port p, n;
	188
	189	list_for_each_entry_safe(p, n, &br->port_list, list) {
1da177e4 LT	190	del_nbp(p);
	191	}
	192
	193	del_timer_sync(&br->gc_timer);
	194
	195	br_sysfs_delbr(br->dev);
9d6f229f	196	unregister_netdevice(br->dev);
1da177e4 LT	197	}
	198
	199	static struct net_device new_bridge_dev(const char name)
	200	{
	201	struct net_bridge *br;
	202	struct net_device *dev;
	203
	204	dev = alloc_netdev(sizeof(struct net_bridge), name,
	205	br_dev_setup);
9d6f229f	206
1da177e4 LT	207	if (!dev)
	208	return NULL;
	209
	210	br = netdev_priv(dev);
	211	br->dev = dev;
	212
	213	spin_lock_init(&br->lock);
	214	INIT_LIST_HEAD(&br->port_list);
	215	spin_lock_init(&br->hash_lock);
	216
	217	br->bridge_id.prio[0] = 0x80;
	218	br->bridge_id.prio[1] = 0x00;
cee48541 SH	219
cee48541 SH	220	memcpy(br->group_addr, br_group_address, ETH_ALEN);
1da177e4	221
edb5e46f	222	br->feature_mask = dev->features;
1da177e4 LT	223	br->stp_enabled = 0;
	224	br->designated_root = br->bridge_id;
	225	br->root_path_cost = 0;
	226	br->root_port = 0;
	227	br->bridge_max_age = br->max_age = 20 * HZ;
	228	br->bridge_hello_time = br->hello_time = 2 * HZ;
	229	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
	230	br->topology_change = 0;
	231	br->topology_change_detected = 0;
	232	br->ageing_time = 300 * HZ;
	233	INIT_LIST_HEAD(&br->age_list);
	234
	235	br_stp_timer_init(br);
	236
	237	return dev;
	238	}
	239
	240	/* find an available port number */
	241	static int find_portno(struct net_bridge *br)
	242	{
	243	int index;
	244	struct net_bridge_port *p;
	245	unsigned long *inuse;
	246
3b781fa1	247	inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
1da177e4 LT	248	GFP_KERNEL);
	249	if (!inuse)
	250	return -ENOMEM;
	251
1da177e4 LT	252	set_bit(0, inuse); /* zero is reserved */
	253	list_for_each_entry(p, &br->port_list, list) {
	254	set_bit(p->port_no, inuse);
	255	}
	256	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	257	kfree(inuse);
	258
	259	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
	260	}
	261
4433f420	262	/* called with RTNL but without bridge lock */
9d6f229f	263	static struct net_bridge_port new_nbp(struct net_bridge br,
4433f420	264	struct net_device *dev)
1da177e4 LT	265	{
	266	int index;
	267	struct net_bridge_port *p;
9d6f229f	268
1da177e4 LT	269	index = find_portno(br);
	270	if (index < 0)
	271	return ERR_PTR(index);
	272
cee48541	273	p = kzalloc(sizeof(*p), GFP_KERNEL);
1da177e4 LT	274	if (p == NULL)
	275	return ERR_PTR(-ENOMEM);
	276
1da177e4 LT	277	p->br = br;
	278	dev_hold(dev);
	279	p->dev = dev;
4433f420	280	p->path_cost = port_cost(dev);
9d6f229f	281	p->priority = 0x8000 >> BR_PORT_BITS;
1da177e4 LT	282	p->port_no = index;
	283	br_init_port(p);
	284	p->state = BR_STATE_DISABLED;
c4028958	285	INIT_DELAYED_WORK_NAR(&p->carrier_check, port_carrier_check);
d32439c0	286	br_stp_port_timer_init(p);
1da177e4	287
d32439c0	288	kobject_init(&p->kobj);
bab1deea SH	289	kobject_set_name(&p->kobj, SYSFS_BRIDGE_PORT_ATTR);
bab1deea SH	290	p->kobj.ktype = &brport_ktype;
43cb76d9	291	p->kobj.parent = &(dev->dev.kobj);
bab1deea SH	292	p->kobj.kset = NULL;
bab1deea SH	293
1da177e4 LT	294	return p;
	295	}
	296
	297	int br_add_bridge(const char *name)
	298	{
	299	struct net_device *dev;
	300	int ret;
	301
	302	dev = new_bridge_dev(name);
9d6f229f	303	if (!dev)
1da177e4 LT	304	return -ENOMEM;
	305
	306	rtnl_lock();
	307	if (strchr(dev->name, '%')) {
	308	ret = dev_alloc_name(dev, dev->name);
36485707 JB	309	if (ret < 0) {
	310	free_netdev(dev);
	311	goto out;
	312	}
1da177e4 LT	313	}
	314
	315	ret = register_netdevice(dev);
	316	if (ret)
36485707	317	goto out;
1da177e4	318
1da177e4	319	ret = br_sysfs_addbr(dev);
ac05202e	320	if (ret)
36485707 JB	321	unregister_netdevice(dev);
36485707 JB	322	out:
1da177e4	323	rtnl_unlock();
ac05202e	324	return ret;
1da177e4 LT	325	}
	326
	327	int br_del_bridge(const char *name)
	328	{
	329	struct net_device *dev;
	330	int ret = 0;
	331
	332	rtnl_lock();
	333	dev = __dev_get_by_name(name);
9d6f229f	334	if (dev == NULL)
1da177e4 LT	335	ret = -ENXIO; /* Could not find device */
	336
	337	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
	338	/* Attempt to delete non bridge device! */
	339	ret = -EPERM;
	340	}
	341
	342	else if (dev->flags & IFF_UP) {
	343	/* Not shutdown yet. */
	344	ret = -EBUSY;
9d6f229f	345	}
1da177e4	346
9d6f229f	347	else
1da177e4 LT	348	del_br(netdev_priv(dev));
	349
	350	rtnl_unlock();
	351	return ret;
	352	}
	353
46f25dff	354	/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1da177e4 LT	355	int br_min_mtu(const struct net_bridge *br)
	356	{
	357	const struct net_bridge_port *p;
	358	int mtu = 0;
	359
	360	ASSERT_RTNL();
	361
	362	if (list_empty(&br->port_list))
46f25dff	363	mtu = ETH_DATA_LEN;
1da177e4 LT	364	else {
	365	list_for_each_entry(p, &br->port_list, list) {
	366	if (!mtu \|\| p->dev->mtu < mtu)
	367	mtu = p->dev->mtu;
	368	}
	369	}
	370	return mtu;
	371	}
	372
81d35307 SH	373	/*
	374	* Recomputes features using slave's features
	375	*/
	376	void br_features_recompute(struct net_bridge *br)
	377	{
	378	struct net_bridge_port *p;
	379	unsigned long features, checksum;
	380
2c6cc0d8 HX	381	checksum = br->feature_mask & NETIF_F_ALL_CSUM ? NETIF_F_NO_CSUM : 0;
2c6cc0d8 HX	382	features = br->feature_mask & ~NETIF_F_ALL_CSUM;
81d35307 SH	383
81d35307 SH	384	list_for_each_entry(p, &br->port_list, list) {
37c3185a HX	385	unsigned long feature = p->dev->features;
	386
	387	if (checksum & NETIF_F_NO_CSUM && !(feature & NETIF_F_NO_CSUM))
2c6cc0d8	388	checksum ^= NETIF_F_NO_CSUM \| NETIF_F_HW_CSUM;
37c3185a	389	if (checksum & NETIF_F_HW_CSUM && !(feature & NETIF_F_HW_CSUM))
2c6cc0d8	390	checksum ^= NETIF_F_HW_CSUM \| NETIF_F_IP_CSUM;
37c3185a	391	if (!(feature & NETIF_F_IP_CSUM))
81d35307	392	checksum = 0;
37c3185a HX	393
37c3185a HX	394	if (feature & NETIF_F_GSO)
78eb8877	395	feature \|= NETIF_F_GSO_SOFTWARE;
37c3185a HX	396	feature \|= NETIF_F_GSO;
	397
	398	features &= feature;
81d35307 SH	399	}
81d35307 SH	400
78eb8877 HX	401	if (!(checksum & NETIF_F_ALL_CSUM))
	402	features &= ~NETIF_F_SG;
	403	if (!(features & NETIF_F_SG))
	404	features &= ~NETIF_F_GSO_MASK;
	405
576a30eb HX	406	br->dev->features = features \| checksum \| NETIF_F_LLTX \|
576a30eb HX	407	NETIF_F_GSO_ROBUST;
81d35307 SH	408	}
81d35307 SH	409
1da177e4 LT	410	/* called with RTNL */
	411	int br_add_if(struct net_bridge br, struct net_device dev)
	412	{
	413	struct net_bridge_port *p;
	414	int err = 0;
	415
	416	if (dev->flags & IFF_LOOPBACK \|\| dev->type != ARPHRD_ETHER)
	417	return -EINVAL;
	418
	419	if (dev->hard_start_xmit == br_dev_xmit)
	420	return -ELOOP;
	421
	422	if (dev->br_port != NULL)
	423	return -EBUSY;
	424
bab1deea SH	425	p = new_nbp(br, dev);
bab1deea SH	426	if (IS_ERR(p))
1da177e4 LT	427	return PTR_ERR(p);
1da177e4 LT	428
bab1deea SH	429	err = kobject_add(&p->kobj);
	430	if (err)
	431	goto err0;
1da177e4	432
9d6f229f	433	err = br_fdb_insert(br, p, dev->dev_addr);
bab1deea SH	434	if (err)
bab1deea SH	435	goto err1;
1da177e4	436
bab1deea SH	437	err = br_sysfs_addif(p);
	438	if (err)
	439	goto err2;
1da177e4	440
bab1deea SH	441	rcu_assign_pointer(dev->br_port, p);
	442	dev_set_promiscuity(dev, 1);
	443
	444	list_add_rcu(&p->list, &br->port_list);
	445
	446	spin_lock_bh(&br->lock);
	447	br_stp_recalculate_bridge_id(br);
	448	br_features_recompute(br);
a10d567c JP	449	if (schedule_delayed_work(&p->carrier_check, BR_PORT_DEBOUNCE))
	450	dev_hold(dev);
	451
bab1deea SH	452	spin_unlock_bh(&br->lock);
	453
	454	dev_set_mtu(br->dev, br_min_mtu(br));
	455	kobject_uevent(&p->kobj, KOBJ_ADD);
1da177e4	456
bab1deea SH	457	return 0;
bab1deea SH	458	err2:
1a620698	459	br_fdb_delete_by_port(br, p, 1);
bab1deea SH	460	err1:
	461	kobject_del(&p->kobj);
	462	err0:
	463	kobject_put(&p->kobj);
1da177e4 LT	464	return err;
	465	}
	466
	467	/* called with RTNL */
	468	int br_del_if(struct net_bridge br, struct net_device dev)
	469	{
	470	struct net_bridge_port *p = dev->br_port;
9d6f229f YH	471
9d6f229f YH	472	if (!p \|\| p->br != br)
1da177e4 LT	473	return -EINVAL;
1da177e4 LT	474
1da177e4 LT	475	del_nbp(p);
	476
	477	spin_lock_bh(&br->lock);
	478	br_stp_recalculate_bridge_id(br);
81d35307	479	br_features_recompute(br);
1da177e4 LT	480	spin_unlock_bh(&br->lock);
	481
	482	return 0;
	483	}
	484
	485	void __exit br_cleanup_bridges(void)
	486	{
	487	struct net_device dev, nxt;
	488
	489	rtnl_lock();
	490	for (dev = dev_base; dev; dev = nxt) {
	491	nxt = dev->next;
	492	if (dev->priv_flags & IFF_EBRIDGE)
	493	del_br(dev->priv);
	494	}
	495	rtnl_unlock();
	496
	497	}