[net-next-2.6.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.
 */
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);

	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 = 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;
	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;
	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 device needs checksumming, downgrade to hw checksumming */
		if (checksum & NETIF_F_NO_CSUM && !(feature & NETIF_F_NO_CSUM))
			checksum ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM;

		/* if device can't do all checksum, downgrade to ipv4/ipv6 */
		if (checksum & NETIF_F_HW_CSUM && !(feature & NETIF_F_HW_CSUM))
			checksum ^= NETIF_F_HW_CSUM
				| NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;

		if (checksum & NETIF_F_IPV6_CSUM && !(feature & NETIF_F_IPV6_CSUM))
			checksum &= ~NETIF_F_IPV6_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 ((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_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_each_netdev_safe(dev, nxt)
		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	*/
269def7c	80	void br_port_carrier_check(struct net_bridge_port *p)
4433f420	81	{
269def7c SH	82	struct net_device *dev = p->dev;
269def7c SH	83	struct net_bridge *br = p->br;
6e86b890 SH	84
	85	if (netif_carrier_ok(dev))
	86	p->path_cost = port_cost(dev);
	87
269def7c	88	if (netif_running(br->dev)) {
6e86b890 SH	89	spin_lock_bh(&br->lock);
	90	if (netif_carrier_ok(dev)) {
	91	if (p->state == BR_STATE_DISABLED)
	92	br_stp_enable_port(p);
	93	} else {
	94	if (p->state != BR_STATE_DISABLED)
	95	br_stp_disable_port(p);
4433f420	96	}
6e86b890	97	spin_unlock_bh(&br->lock);
4433f420	98	}
4433f420 SH	99	}
4433f420 SH	100
bab1deea SH	101	static void release_nbp(struct kobject *kobj)
	102	{
	103	struct net_bridge_port *p
	104	= container_of(kobj, struct net_bridge_port, kobj);
	105	kfree(p);
	106	}
	107
	108	static struct kobj_type brport_ktype = {
	109	#ifdef CONFIG_SYSFS
	110	.sysfs_ops = &brport_sysfs_ops,
	111	#endif
	112	.release = release_nbp,
	113	};
	114
1da177e4 LT	115	static void destroy_nbp(struct net_bridge_port *p)
	116	{
	117	struct net_device *dev = p->dev;
	118
1da177e4 LT	119	p->br = NULL;
	120	p->dev = NULL;
	121	dev_put(dev);
	122
bab1deea	123	kobject_put(&p->kobj);
1da177e4 LT	124	}
	125
	126	static void destroy_nbp_rcu(struct rcu_head *head)
	127	{
	128	struct net_bridge_port *p =
	129	container_of(head, struct net_bridge_port, rcu);
	130	destroy_nbp(p);
	131	}
	132
3f4cfc2d SH	133	/* Delete port(interface) from bridge is done in two steps.
	134	* via RCU. First step, marks device as down. That deletes
	135	* all the timers and stops new packets from flowing through.
	136	*
	137	* Final cleanup doesn't occur until after all CPU's finished
	138	* processing packets.
	139	*
	140	* Protected from multiple admin operations by RTNL mutex
	141	*/
1da177e4 LT	142	static void del_nbp(struct net_bridge_port *p)
	143	{
	144	struct net_bridge *br = p->br;
	145	struct net_device *dev = p->dev;
	146
bab1deea SH	147	sysfs_remove_link(&br->ifobj, dev->name);
bab1deea SH	148
1da177e4 LT	149	dev_set_promiscuity(dev, -1);
	150
	151	spin_lock_bh(&br->lock);
	152	br_stp_disable_port(p);
	153	spin_unlock_bh(&br->lock);
	154
b86c4503 SH	155	br_ifinfo_notify(RTM_DELLINK, p);
b86c4503 SH	156
1a620698	157	br_fdb_delete_by_port(br, p, 1);
1da177e4 LT	158
	159	list_del_rcu(&p->list);
	160
b3f1be4b SH	161	rcu_assign_pointer(dev->br_port, NULL);
b3f1be4b SH	162
125a12cc	163	kobject_uevent(&p->kobj, KOBJ_REMOVE);
bab1deea SH	164	kobject_del(&p->kobj);
bab1deea SH	165
1da177e4 LT	166	call_rcu(&p->rcu, destroy_nbp_rcu);
	167	}
	168
	169	/* called with RTNL */
	170	static void del_br(struct net_bridge *br)
	171	{
	172	struct net_bridge_port p, n;
	173
	174	list_for_each_entry_safe(p, n, &br->port_list, list) {
1da177e4 LT	175	del_nbp(p);
	176	}
	177
	178	del_timer_sync(&br->gc_timer);
	179
	180	br_sysfs_delbr(br->dev);
9d6f229f	181	unregister_netdevice(br->dev);
1da177e4 LT	182	}
	183
	184	static struct net_device new_bridge_dev(const char name)
	185	{
	186	struct net_bridge *br;
	187	struct net_device *dev;
	188
	189	dev = alloc_netdev(sizeof(struct net_bridge), name,
	190	br_dev_setup);
9d6f229f	191
1da177e4 LT	192	if (!dev)
	193	return NULL;
	194
	195	br = netdev_priv(dev);
	196	br->dev = dev;
	197
	198	spin_lock_init(&br->lock);
	199	INIT_LIST_HEAD(&br->port_list);
	200	spin_lock_init(&br->hash_lock);
	201
	202	br->bridge_id.prio[0] = 0x80;
	203	br->bridge_id.prio[1] = 0x00;
cee48541 SH	204
cee48541 SH	205	memcpy(br->group_addr, br_group_address, ETH_ALEN);
1da177e4	206
edb5e46f	207	br->feature_mask = dev->features;
9cde0708	208	br->stp_enabled = BR_NO_STP;
1da177e4 LT	209	br->designated_root = br->bridge_id;
	210	br->root_path_cost = 0;
	211	br->root_port = 0;
	212	br->bridge_max_age = br->max_age = 20 * HZ;
	213	br->bridge_hello_time = br->hello_time = 2 * HZ;
	214	br->bridge_forward_delay = br->forward_delay = 15 * HZ;
	215	br->topology_change = 0;
	216	br->topology_change_detected = 0;
	217	br->ageing_time = 300 * HZ;
	218	INIT_LIST_HEAD(&br->age_list);
	219
	220	br_stp_timer_init(br);
	221
	222	return dev;
	223	}
	224
	225	/* find an available port number */
	226	static int find_portno(struct net_bridge *br)
	227	{
	228	int index;
	229	struct net_bridge_port *p;
	230	unsigned long *inuse;
	231
3b781fa1	232	inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
1da177e4 LT	233	GFP_KERNEL);
	234	if (!inuse)
	235	return -ENOMEM;
	236
1da177e4 LT	237	set_bit(0, inuse); /* zero is reserved */
	238	list_for_each_entry(p, &br->port_list, list) {
	239	set_bit(p->port_no, inuse);
	240	}
	241	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	242	kfree(inuse);
	243
	244	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
	245	}
	246
4433f420	247	/* called with RTNL but without bridge lock */
9d6f229f	248	static struct net_bridge_port new_nbp(struct net_bridge br,
4433f420	249	struct net_device *dev)
1da177e4 LT	250	{
	251	int index;
	252	struct net_bridge_port *p;
9d6f229f	253
1da177e4 LT	254	index = find_portno(br);
	255	if (index < 0)
	256	return ERR_PTR(index);
	257
cee48541	258	p = kzalloc(sizeof(*p), GFP_KERNEL);
1da177e4 LT	259	if (p == NULL)
	260	return ERR_PTR(-ENOMEM);
	261
1da177e4 LT	262	p->br = br;
	263	dev_hold(dev);
	264	p->dev = dev;
4433f420	265	p->path_cost = port_cost(dev);
9d6f229f	266	p->priority = 0x8000 >> BR_PORT_BITS;
1da177e4 LT	267	p->port_no = index;
	268	br_init_port(p);
	269	p->state = BR_STATE_DISABLED;
d32439c0	270	br_stp_port_timer_init(p);
1da177e4	271
d32439c0	272	kobject_init(&p->kobj);
bab1deea SH	273	kobject_set_name(&p->kobj, SYSFS_BRIDGE_PORT_ATTR);
bab1deea SH	274	p->kobj.ktype = &brport_ktype;
43cb76d9	275	p->kobj.parent = &(dev->dev.kobj);
bab1deea SH	276	p->kobj.kset = NULL;
bab1deea SH	277
1da177e4 LT	278	return p;
	279	}
	280
	281	int br_add_bridge(const char *name)
	282	{
	283	struct net_device *dev;
	284	int ret;
	285
	286	dev = new_bridge_dev(name);
9d6f229f	287	if (!dev)
1da177e4 LT	288	return -ENOMEM;
	289
	290	rtnl_lock();
	291	if (strchr(dev->name, '%')) {
	292	ret = dev_alloc_name(dev, dev->name);
36485707 JB	293	if (ret < 0) {
	294	free_netdev(dev);
	295	goto out;
	296	}
1da177e4 LT	297	}
	298
	299	ret = register_netdevice(dev);
	300	if (ret)
36485707	301	goto out;
1da177e4	302
1da177e4	303	ret = br_sysfs_addbr(dev);
ac05202e	304	if (ret)
36485707 JB	305	unregister_netdevice(dev);
36485707 JB	306	out:
1da177e4	307	rtnl_unlock();
ac05202e	308	return ret;
1da177e4 LT	309	}
	310
	311	int br_del_bridge(const char *name)
	312	{
	313	struct net_device *dev;
	314	int ret = 0;
	315
	316	rtnl_lock();
	317	dev = __dev_get_by_name(name);
9d6f229f	318	if (dev == NULL)
1da177e4 LT	319	ret = -ENXIO; /* Could not find device */
	320
	321	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
	322	/* Attempt to delete non bridge device! */
	323	ret = -EPERM;
	324	}
	325
	326	else if (dev->flags & IFF_UP) {
	327	/* Not shutdown yet. */
	328	ret = -EBUSY;
9d6f229f	329	}
1da177e4	330
9d6f229f	331	else
1da177e4 LT	332	del_br(netdev_priv(dev));
	333
	334	rtnl_unlock();
	335	return ret;
	336	}
	337
46f25dff	338	/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1da177e4 LT	339	int br_min_mtu(const struct net_bridge *br)
	340	{
	341	const struct net_bridge_port *p;
	342	int mtu = 0;
	343
	344	ASSERT_RTNL();
	345
	346	if (list_empty(&br->port_list))
46f25dff	347	mtu = ETH_DATA_LEN;
1da177e4 LT	348	else {
	349	list_for_each_entry(p, &br->port_list, list) {
	350	if (!mtu \|\| p->dev->mtu < mtu)
	351	mtu = p->dev->mtu;
	352	}
	353	}
	354	return mtu;
	355	}
	356
81d35307 SH	357	/*
	358	* Recomputes features using slave's features
	359	*/
	360	void br_features_recompute(struct net_bridge *br)
	361	{
	362	struct net_bridge_port *p;
	363	unsigned long features, checksum;
	364
2c6cc0d8 HX	365	checksum = br->feature_mask & NETIF_F_ALL_CSUM ? NETIF_F_NO_CSUM : 0;
2c6cc0d8 HX	366	features = br->feature_mask & ~NETIF_F_ALL_CSUM;
81d35307 SH	367
81d35307 SH	368	list_for_each_entry(p, &br->port_list, list) {
37c3185a HX	369	unsigned long feature = p->dev->features;
37c3185a HX	370
d212f87b	371	/* if device needs checksumming, downgrade to hw checksumming */
37c3185a	372	if (checksum & NETIF_F_NO_CSUM && !(feature & NETIF_F_NO_CSUM))
2c6cc0d8	373	checksum ^= NETIF_F_NO_CSUM \| NETIF_F_HW_CSUM;
d212f87b SH	374
d212f87b SH	375	/* if device can't do all checksum, downgrade to ipv4/ipv6 */
37c3185a	376	if (checksum & NETIF_F_HW_CSUM && !(feature & NETIF_F_HW_CSUM))
d212f87b SH	377	checksum ^= NETIF_F_HW_CSUM
	378	\| NETIF_F_IP_CSUM \| NETIF_F_IPV6_CSUM;
	379
	380	if (checksum & NETIF_F_IPV6_CSUM && !(feature & NETIF_F_IPV6_CSUM))
	381	checksum &= ~NETIF_F_IPV6_CSUM;
	382
37c3185a	383	if (!(feature & NETIF_F_IP_CSUM))
81d35307	384	checksum = 0;
37c3185a HX	385
37c3185a HX	386	if (feature & NETIF_F_GSO)
78eb8877	387	feature \|= NETIF_F_GSO_SOFTWARE;
37c3185a HX	388	feature \|= NETIF_F_GSO;
	389
	390	features &= feature;
81d35307 SH	391	}
81d35307 SH	392
78eb8877 HX	393	if (!(checksum & NETIF_F_ALL_CSUM))
	394	features &= ~NETIF_F_SG;
	395	if (!(features & NETIF_F_SG))
	396	features &= ~NETIF_F_GSO_MASK;
	397
576a30eb HX	398	br->dev->features = features \| checksum \| NETIF_F_LLTX \|
576a30eb HX	399	NETIF_F_GSO_ROBUST;
81d35307 SH	400	}
81d35307 SH	401
1da177e4 LT	402	/* called with RTNL */
	403	int br_add_if(struct net_bridge br, struct net_device dev)
	404	{
	405	struct net_bridge_port *p;
	406	int err = 0;
	407
	408	if (dev->flags & IFF_LOOPBACK \|\| dev->type != ARPHRD_ETHER)
	409	return -EINVAL;
	410
	411	if (dev->hard_start_xmit == br_dev_xmit)
	412	return -ELOOP;
	413
	414	if (dev->br_port != NULL)
	415	return -EBUSY;
	416
bab1deea SH	417	p = new_nbp(br, dev);
bab1deea SH	418	if (IS_ERR(p))
1da177e4 LT	419	return PTR_ERR(p);
1da177e4 LT	420
bab1deea SH	421	err = kobject_add(&p->kobj);
	422	if (err)
	423	goto err0;
1da177e4	424
9d6f229f	425	err = br_fdb_insert(br, p, dev->dev_addr);
bab1deea SH	426	if (err)
bab1deea SH	427	goto err1;
1da177e4	428
bab1deea SH	429	err = br_sysfs_addif(p);
	430	if (err)
	431	goto err2;
1da177e4	432
bab1deea SH	433	rcu_assign_pointer(dev->br_port, p);
	434	dev_set_promiscuity(dev, 1);
	435
	436	list_add_rcu(&p->list, &br->port_list);
	437
	438	spin_lock_bh(&br->lock);
	439	br_stp_recalculate_bridge_id(br);
	440	br_features_recompute(br);
de79059e AS	441
	442	if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
	443	(br->dev->flags & IFF_UP))
	444	br_stp_enable_port(p);
bab1deea SH	445	spin_unlock_bh(&br->lock);
bab1deea SH	446
b86c4503 SH	447	br_ifinfo_notify(RTM_NEWLINK, p);
b86c4503 SH	448
bab1deea	449	dev_set_mtu(br->dev, br_min_mtu(br));
269def7c	450
bab1deea	451	kobject_uevent(&p->kobj, KOBJ_ADD);
1da177e4	452
bab1deea SH	453	return 0;
bab1deea SH	454	err2:
1a620698	455	br_fdb_delete_by_port(br, p, 1);
bab1deea SH	456	err1:
	457	kobject_del(&p->kobj);
	458	err0:
	459	kobject_put(&p->kobj);
1da177e4 LT	460	return err;
	461	}
	462
	463	/* called with RTNL */
	464	int br_del_if(struct net_bridge br, struct net_device dev)
	465	{
	466	struct net_bridge_port *p = dev->br_port;
9d6f229f YH	467
9d6f229f YH	468	if (!p \|\| p->br != br)
1da177e4 LT	469	return -EINVAL;
1da177e4 LT	470
1da177e4 LT	471	del_nbp(p);
	472
	473	spin_lock_bh(&br->lock);
	474	br_stp_recalculate_bridge_id(br);
81d35307	475	br_features_recompute(br);
1da177e4 LT	476	spin_unlock_bh(&br->lock);
	477
	478	return 0;
	479	}
	480
	481	void __exit br_cleanup_bridges(void)
	482	{
	483	struct net_device dev, nxt;
	484
	485	rtnl_lock();
7562f876	486	for_each_netdev_safe(dev, nxt)
1da177e4 LT	487	if (dev->priv_flags & IFF_EBRIDGE)
1da177e4 LT	488	del_br(dev->priv);
1da177e4 LT	489	rtnl_unlock();
	490
	491	}