[linux-2.6-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 transitions. */
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 br_port_set_promisc(struct net_bridge_port *p)
{
	int err = 0;

	if (br_promisc_port(p))
		return;

	err = dev_set_promiscuity(p->dev, 1);
	if (err)
		return;

	br_fdb_unsync_static(p->br, p);
	p->flags |= BR_PROMISC;
}

static void br_port_clear_promisc(struct net_bridge_port *p)
{
	int err;

	/* Check if the port is already non-promisc or if it doesn't
	 * support UNICAST filtering.  Without unicast filtering support
	 * we'll end up re-enabling promisc mode anyway, so just check for
	 * it here.
	 */
	if (!br_promisc_port(p) || !(p->dev->priv_flags & IFF_UNICAST_FLT))
		return;

	/* Since we'll be clearing the promisc mode, program the port
	 * first so that we don't have interruption in traffic.
	 */
	err = br_fdb_sync_static(p->br, p);
	if (err)
		return;

	dev_set_promiscuity(p->dev, -1);
	p->flags &= ~BR_PROMISC;
}

/* When a port is added or removed or when certain port flags
 * change, this function is called to automatically manage
 * promiscuity setting of all the bridge ports.  We are always called
 * under RTNL so can skip using rcu primitives.
 */
void br_manage_promisc(struct net_bridge *br)
{
	struct net_bridge_port *p;
	bool set_all = false;

	/* If vlan filtering is disabled or bridge interface is placed
	 * into promiscuous mode, place all ports in promiscuous mode.
	 */
	if ((br->dev->flags & IFF_PROMISC) || !br_vlan_enabled(br))
		set_all = true;

	list_for_each_entry(p, &br->port_list, list) {
		if (set_all) {
			br_port_set_promisc(p);
		} else {
			/* If the number of auto-ports is <= 1, then all other
			 * ports will have their output configuration
			 * statically specified through fdbs.  Since ingress
			 * on the auto-port becomes forwarding/egress to other
			 * ports and egress configuration is statically known,
			 * we can say that ingress configuration of the
			 * auto-port is also statically known.
			 * This lets us disable promiscuous mode and write
			 * this config to hw.
			 */
			if (br->auto_cnt == 0 ||
			    (br->auto_cnt == 1 && br_auto_port(p)))
				br_port_clear_promisc(p);
			else
				br_port_set_promisc(p);
		}
	}
}

static void nbp_update_port_count(struct net_bridge *br)
{
	struct net_bridge_port *p;
	u32 cnt = 0;

	list_for_each_entry(p, &br->port_list, list) {
		if (br_auto_port(p))
			cnt++;
	}
	if (br->auto_cnt != cnt) {
		br->auto_cnt = cnt;
		br_manage_promisc(br);
	}
}

static void nbp_delete_promisc(struct net_bridge_port *p)
{
	/* If port is currently promiscuous, unset promiscuity.
	 * Otherwise, it is a static port so remove all addresses
	 * from it.
	 */
	dev_set_allmulti(p->dev, -1);
	if (br_promisc_port(p))
		dev_set_promiscuity(p->dev, -1);
	else
		br_fdb_unsync_static(p->br, p);
}

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);

	nbp_delete_promisc(p);

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

	br_ifinfo_notify(RTM_DELLINK, p);

	list_del_rcu(&p->list);

	nbp_vlan_flush(p);
	br_fdb_delete_by_port(br, p, 1);
	nbp_update_port_count(br);

	netdev_upper_dev_unlink(dev, br->dev);

	dev->priv_flags &= ~IFF_BRIDGE_PORT;

	netdev_rx_handler_unregister(dev);

	br_multicast_del_port(p);

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

	br_netpoll_disable(p);

	call_rcu(&p->rcu, destroy_nbp_rcu);
}

/* 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_fdb_delete_by_port(br, NULL, 1);

	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);
	br_set_state(p, 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, NET_NAME_UNKNOWN,
			   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_allmulti(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);
	if (err)
		goto err3;

	err = netdev_rx_handler_register(dev, br_handle_frame, p);
	if (err)
		goto err4;

	dev->priv_flags |= IFF_BRIDGE_PORT;

	err = netdev_master_upper_dev_link(dev, br->dev);
	if (err)
		goto err5;

	dev_disable_lro(dev);

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

	nbp_update_port_count(br);

	netdev_update_features(br->dev);

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

	if (br_fdb_insert(br, p, dev->dev_addr, 0))
		netdev_err(dev, "failed insert local address bridge forwarding table\n");

	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));

	kobject_uevent(&p->kobj, KOBJ_ADD);

	return 0;

err5:
	dev->priv_flags &= ~IFF_BRIDGE_PORT;
	netdev_rx_handler_unregister(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_allmulti(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 br_port_flags_change(struct net_bridge_port *p, unsigned long mask)
{
	struct net_bridge *br = p->br;

	if (mask & BR_AUTO_MASK)
		nbp_update_port_count(br);
}
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
1a81a2e0	64	/* Check for port carrier transitions. */
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
2796d0c6 VY	88	static void br_port_set_promisc(struct net_bridge_port *p)
	89	{
	90	int err = 0;
	91
	92	if (br_promisc_port(p))
	93	return;
	94
	95	err = dev_set_promiscuity(p->dev, 1);
	96	if (err)
	97	return;
	98
	99	br_fdb_unsync_static(p->br, p);
	100	p->flags \|= BR_PROMISC;
	101	}
	102
	103	static void br_port_clear_promisc(struct net_bridge_port *p)
	104	{
	105	int err;
	106
	107	/* Check if the port is already non-promisc or if it doesn't
	108	* support UNICAST filtering. Without unicast filtering support
	109	* we'll end up re-enabling promisc mode anyway, so just check for
	110	* it here.
	111	*/
	112	if (!br_promisc_port(p) \|\| !(p->dev->priv_flags & IFF_UNICAST_FLT))
	113	return;
	114
	115	/* Since we'll be clearing the promisc mode, program the port
	116	* first so that we don't have interruption in traffic.
	117	*/
	118	err = br_fdb_sync_static(p->br, p);
	119	if (err)
	120	return;
	121
	122	dev_set_promiscuity(p->dev, -1);
	123	p->flags &= ~BR_PROMISC;
	124	}
	125
	126	/* When a port is added or removed or when certain port flags
	127	* change, this function is called to automatically manage
	128	* promiscuity setting of all the bridge ports. We are always called
	129	* under RTNL so can skip using rcu primitives.
	130	*/
	131	void br_manage_promisc(struct net_bridge *br)
	132	{
	133	struct net_bridge_port *p;
	134	bool set_all = false;
	135
	136	/* If vlan filtering is disabled or bridge interface is placed
	137	* into promiscuous mode, place all ports in promiscuous mode.
	138	*/
	139	if ((br->dev->flags & IFF_PROMISC) \|\| !br_vlan_enabled(br))
	140	set_all = true;
	141
	142	list_for_each_entry(p, &br->port_list, list) {
	143	if (set_all) {
	144	br_port_set_promisc(p);
	145	} else {
	146	/* If the number of auto-ports is <= 1, then all other
	147	* ports will have their output configuration
	148	* statically specified through fdbs. Since ingress
	149	* on the auto-port becomes forwarding/egress to other
	150	* ports and egress configuration is statically known,
	151	* we can say that ingress configuration of the
152	* auto-port is also statically known.
153	* This lets us disable promiscuous mode and write
154	* this config to hw.
155	*/
e0a47d1f TM	156	if (br->auto_cnt == 0 \|\|
e0a47d1f TM	157	(br->auto_cnt == 1 && br_auto_port(p)))
2796d0c6 VY	158	br_port_clear_promisc(p);
	159	else
	160	br_port_set_promisc(p);
	161	}
	162	}
	163	}
	164
e028e4b8 VY	165	static void nbp_update_port_count(struct net_bridge *br)
	166	{
	167	struct net_bridge_port *p;
	168	u32 cnt = 0;
	169
	170	list_for_each_entry(p, &br->port_list, list) {
	171	if (br_auto_port(p))
	172	cnt++;
	173	}
2796d0c6 VY	174	if (br->auto_cnt != cnt) {
	175	br->auto_cnt = cnt;
	176	br_manage_promisc(br);
	177	}
	178	}
	179
	180	static void nbp_delete_promisc(struct net_bridge_port *p)
	181	{
025559ee	182	/* If port is currently promiscuous, unset promiscuity.
2796d0c6 VY	183	* Otherwise, it is a static port so remove all addresses
	184	* from it.
	185	*/
	186	dev_set_allmulti(p->dev, -1);
	187	if (br_promisc_port(p))
	188	dev_set_promiscuity(p->dev, -1);
	189	else
	190	br_fdb_unsync_static(p->br, p);
e028e4b8 VY	191	}
e028e4b8 VY	192
bab1deea SH	193	static void release_nbp(struct kobject *kobj)
	194	{
	195	struct net_bridge_port *p
	196	= container_of(kobj, struct net_bridge_port, kobj);
	197	kfree(p);
	198	}
	199
	200	static struct kobj_type brport_ktype = {
	201	#ifdef CONFIG_SYSFS
	202	.sysfs_ops = &brport_sysfs_ops,
	203	#endif
	204	.release = release_nbp,
	205	};
	206
1da177e4 LT	207	static void destroy_nbp(struct net_bridge_port *p)
	208	{
	209	struct net_device *dev = p->dev;
	210
1da177e4 LT	211	p->br = NULL;
	212	p->dev = NULL;
	213	dev_put(dev);
	214
bab1deea	215	kobject_put(&p->kobj);
1da177e4 LT	216	}
	217
	218	static void destroy_nbp_rcu(struct rcu_head *head)
	219	{
	220	struct net_bridge_port *p =
	221	container_of(head, struct net_bridge_port, rcu);
	222	destroy_nbp(p);
	223	}
	224
3f4cfc2d SH	225	/* Delete port(interface) from bridge is done in two steps.
	226	* via RCU. First step, marks device as down. That deletes
	227	* all the timers and stops new packets from flowing through.
	228	*
	229	* Final cleanup doesn't occur until after all CPU's finished
	230	* processing packets.
	231	*
	232	* Protected from multiple admin operations by RTNL mutex
	233	*/
1da177e4 LT	234	static void del_nbp(struct net_bridge_port *p)
	235	{
	236	struct net_bridge *br = p->br;
	237	struct net_device *dev = p->dev;
	238
b3bcb72e	239	sysfs_remove_link(br->ifobj, p->dev->name);
bab1deea	240
2796d0c6	241	nbp_delete_promisc(p);
1da177e4 LT	242
	243	spin_lock_bh(&br->lock);
	244	br_stp_disable_port(p);
	245	spin_unlock_bh(&br->lock);
	246
b86c4503 SH	247	br_ifinfo_notify(RTM_DELLINK, p);
b86c4503 SH	248
1da177e4 LT	249	list_del_rcu(&p->list);
1da177e4 LT	250
2796d0c6 VY	251	nbp_vlan_flush(p);
2796d0c6 VY	252	br_fdb_delete_by_port(br, p, 1);
e028e4b8 VY	253	nbp_update_port_count(br);
e028e4b8 VY	254
0f49579a JP	255	netdev_upper_dev_unlink(dev, br->dev);
0f49579a JP	256
f350a0a8 JP	257	dev->priv_flags &= ~IFF_BRIDGE_PORT;
f350a0a8 JP	258
ab95bfe0	259	netdev_rx_handler_unregister(dev);
b3f1be4b	260
3fe2d7c7 HX	261	br_multicast_del_port(p);
3fe2d7c7 HX	262
125a12cc	263	kobject_uevent(&p->kobj, KOBJ_REMOVE);
bab1deea SH	264	kobject_del(&p->kobj);
bab1deea SH	265
91d2c34a HX	266	br_netpoll_disable(p);
91d2c34a HX	267
1da177e4 LT	268	call_rcu(&p->rcu, destroy_nbp_rcu);
	269	}
	270
1ce5cce8	271	/* Delete bridge device */
1ce5cce8	272	void br_dev_delete(struct net_device dev, struct list_head head)
1da177e4	273	{
1ce5cce8	274	struct net_bridge *br = netdev_priv(dev);
1da177e4 LT	275	struct net_bridge_port p, n;
	276
	277	list_for_each_entry_safe(p, n, &br->port_list, list) {
1da177e4 LT	278	del_nbp(p);
	279	}
	280
f8730420 DT	281	br_fdb_delete_by_port(br, NULL, 1);
f8730420 DT	282
b4e09b29	283	br_vlan_flush(br);
1da177e4 LT	284	del_timer_sync(&br->gc_timer);
	285
	286	br_sysfs_delbr(br->dev);
8c56ba05	287	unregister_netdevice_queue(br->dev, head);
1da177e4 LT	288	}
1da177e4 LT	289
1da177e4 LT	290	/* find an available port number */
	291	static int find_portno(struct net_bridge *br)
	292	{
	293	int index;
	294	struct net_bridge_port *p;
	295	unsigned long *inuse;
	296
3b781fa1	297	inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
1da177e4 LT	298	GFP_KERNEL);
	299	if (!inuse)
	300	return -ENOMEM;
	301
1da177e4 LT	302	set_bit(0, inuse); /* zero is reserved */
	303	list_for_each_entry(p, &br->port_list, list) {
	304	set_bit(p->port_no, inuse);
	305	}
	306	index = find_first_zero_bit(inuse, BR_MAX_PORTS);
	307	kfree(inuse);
	308
	309	return (index >= BR_MAX_PORTS) ? -EXFULL : index;
	310	}
	311
4433f420	312	/* called with RTNL but without bridge lock */
9d6f229f	313	static struct net_bridge_port new_nbp(struct net_bridge br,
4433f420	314	struct net_device *dev)
1da177e4 LT	315	{
	316	int index;
	317	struct net_bridge_port *p;
9d6f229f	318
1da177e4 LT	319	index = find_portno(br);
	320	if (index < 0)
	321	return ERR_PTR(index);
	322
cee48541	323	p = kzalloc(sizeof(*p), GFP_KERNEL);
1da177e4 LT	324	if (p == NULL)
	325	return ERR_PTR(-ENOMEM);
	326
1da177e4 LT	327	p->br = br;
	328	dev_hold(dev);
	329	p->dev = dev;
4433f420	330	p->path_cost = port_cost(dev);
9d6f229f	331	p->priority = 0x8000 >> BR_PORT_BITS;
1da177e4	332	p->port_no = index;
2796d0c6	333	p->flags = BR_LEARNING \| BR_FLOOD;
1da177e4	334	br_init_port(p);
775dd692	335	br_set_state(p, BR_STATE_DISABLED);
d32439c0	336	br_stp_port_timer_init(p);
3fe2d7c7	337	br_multicast_add_port(p);
1da177e4 LT	338
	339	return p;
	340	}
	341
4aa678ba	342	int br_add_bridge(struct net net, const char name)
1da177e4 LT	343	{
1da177e4 LT	344	struct net_device *dev;
11f3a6bd	345	int res;
1da177e4	346
c835a677	347	dev = alloc_netdev(sizeof(struct net_bridge), name, NET_NAME_UNKNOWN,
bb900b27	348	br_dev_setup);
bb900b27	349
9d6f229f	350	if (!dev)
1da177e4 LT	351	return -ENOMEM;
1da177e4 LT	352
bb900b27	353	dev_net_set(dev, net);
149ddd83	354	dev->rtnl_link_ops = &br_link_ops;
e340a90e	355
11f3a6bd ED	356	res = register_netdev(dev);
	357	if (res)
	358	free_netdev(dev);
	359	return res;
1da177e4 LT	360	}
1da177e4 LT	361
4aa678ba	362	int br_del_bridge(struct net net, const char name)
1da177e4 LT	363	{
	364	struct net_device *dev;
	365	int ret = 0;
	366
	367	rtnl_lock();
4aa678ba	368	dev = __dev_get_by_name(net, name);
9d6f229f	369	if (dev == NULL)
1da177e4 LT	370	ret = -ENXIO; /* Could not find device */
	371
	372	else if (!(dev->priv_flags & IFF_EBRIDGE)) {
	373	/* Attempt to delete non bridge device! */
	374	ret = -EPERM;
	375	}
	376
	377	else if (dev->flags & IFF_UP) {
	378	/* Not shutdown yet. */
	379	ret = -EBUSY;
9d6f229f	380	}
1da177e4	381
9d6f229f	382	else
1ce5cce8	383	br_dev_delete(dev, NULL);
1da177e4 LT	384
	385	rtnl_unlock();
	386	return ret;
	387	}
	388
46f25dff	389	/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1da177e4 LT	390	int br_min_mtu(const struct net_bridge *br)
	391	{
	392	const struct net_bridge_port *p;
	393	int mtu = 0;
	394
	395	ASSERT_RTNL();
	396
	397	if (list_empty(&br->port_list))
46f25dff	398	mtu = ETH_DATA_LEN;
1da177e4 LT	399	else {
	400	list_for_each_entry(p, &br->port_list, list) {
	401	if (!mtu \|\| p->dev->mtu < mtu)
	402	mtu = p->dev->mtu;
	403	}
	404	}
	405	return mtu;
	406	}
	407
81d35307 SH	408	/*
	409	* Recomputes features using slave's features
	410	*/
c8f44aff MM	411	netdev_features_t br_features_recompute(struct net_bridge *br,
c8f44aff MM	412	netdev_features_t features)
81d35307 SH	413	{
81d35307 SH	414	struct net_bridge_port *p;
c8f44aff	415	netdev_features_t mask;
81d35307	416
b63365a2	417	if (list_empty(&br->port_list))
c4d27ef9	418	return features;
b63365a2	419
c4d27ef9	420	mask = features;
b63365a2	421	features &= ~NETIF_F_ONE_FOR_ALL;
81d35307 SH	422
81d35307 SH	423	list_for_each_entry(p, &br->port_list, list) {
b63365a2 HX	424	features = netdev_increment_features(features,
b63365a2 HX	425	p->dev->features, mask);
81d35307 SH	426	}
81d35307 SH	427
c4d27ef9	428	return features;
81d35307 SH	429	}
81d35307 SH	430
1da177e4 LT	431	/* called with RTNL */
	432	int br_add_if(struct net_bridge br, struct net_device dev)
	433	{
	434	struct net_bridge_port *p;
	435	int err = 0;
edf947f1	436	bool changed_addr;
1da177e4	437
1056bd51 SH	438	/* Don't allow bridging non-ethernet like devices */
1056bd51 SH	439	if ((dev->flags & IFF_LOOPBACK) \|\|
77f98598	440	dev->type != ARPHRD_ETHER \|\| dev->addr_len != ETH_ALEN \|\|
77f98598	441	!is_valid_ether_addr(dev->dev_addr))
1da177e4 LT	442	return -EINVAL;
1da177e4 LT	443
1056bd51	444	/* No bridging of bridges */
00829823	445	if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
1da177e4 LT	446	return -ELOOP;
1da177e4 LT	447
1056bd51	448	/* Device is already being bridged */
f350a0a8	449	if (br_port_exists(dev))
1da177e4 LT	450	return -EBUSY;
1da177e4 LT	451
ad4bb6f8 JB	452	/* No bridging devices that dislike that (e.g. wireless) */
	453	if (dev->priv_flags & IFF_DONT_BRIDGE)
	454	return -EOPNOTSUPP;
	455
bab1deea SH	456	p = new_nbp(br, dev);
bab1deea SH	457	if (IS_ERR(p))
1da177e4 LT	458	return PTR_ERR(p);
1da177e4 LT	459
bb8ed630 AW	460	call_netdevice_notifiers(NETDEV_JOIN, dev);
bb8ed630 AW	461
2796d0c6	462	err = dev_set_allmulti(dev, 1);
bc3f9076 WC	463	if (err)
	464	goto put_back;
	465
e32cc736 GKH	466	err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
e32cc736 GKH	467	SYSFS_BRIDGE_PORT_ATTR);
bab1deea SH	468	if (err)
bab1deea SH	469	goto err1;
1da177e4	470
bab1deea SH	471	err = br_sysfs_addif(p);
	472	if (err)
	473	goto err2;
1da177e4	474
a8779ec1	475	err = br_netpoll_enable(p);
93d8bf9f	476	if (err)
91d2c34a HX	477	goto err3;
91d2c34a HX	478
0f49579a	479	err = netdev_rx_handler_register(dev, br_handle_frame, p);
ab95bfe0	480	if (err)
9b1536c4	481	goto err4;
f350a0a8	482
0f49579a JP	483	dev->priv_flags \|= IFF_BRIDGE_PORT;
	484
	485	err = netdev_master_upper_dev_link(dev, br->dev);
afc6151a	486	if (err)
9b1536c4	487	goto err5;
afc6151a	488
0187bdfb	489	dev_disable_lro(dev);
bab1deea SH	490
	491	list_add_rcu(&p->list, &br->port_list);
	492
e028e4b8 VY	493	nbp_update_port_count(br);
e028e4b8 VY	494
c4d27ef9 MM	495	netdev_update_features(br->dev);
c4d27ef9 MM	496
fd094808 FF	497	if (br->dev->needed_headroom < dev->needed_headroom)
	498	br->dev->needed_headroom = dev->needed_headroom;
	499
a4b816d8 TM	500	if (br_fdb_insert(br, p, dev->dev_addr, 0))
	501	netdev_err(dev, "failed insert local address bridge forwarding table\n");
	502
bab1deea	503	spin_lock_bh(&br->lock);
edf947f1	504	changed_addr = br_stp_recalculate_bridge_id(br);
de79059e	505
576eb625	506	if (netif_running(dev) && netif_oper_up(dev) &&
de79059e AS	507	(br->dev->flags & IFF_UP))
de79059e AS	508	br_stp_enable_port(p);
bab1deea SH	509	spin_unlock_bh(&br->lock);
bab1deea SH	510
b86c4503 SH	511	br_ifinfo_notify(RTM_NEWLINK, p);
b86c4503 SH	512
edf947f1	513	if (changed_addr)
56139fc5	514	call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
edf947f1	515
bab1deea	516	dev_set_mtu(br->dev, br_min_mtu(br));
269def7c	517
bab1deea	518	kobject_uevent(&p->kobj, KOBJ_ADD);
1da177e4	519
bab1deea	520	return 0;
afc6151a	521
9b1536c4	522	err5:
0f49579a JP	523	dev->priv_flags &= ~IFF_BRIDGE_PORT;
0f49579a JP	524	netdev_rx_handler_unregister(dev);
9b1536c4 G	525	err4:
9b1536c4 G	526	br_netpoll_disable(p);
91d2c34a HX	527	err3:
91d2c34a HX	528	sysfs_remove_link(br->ifobj, p->dev->name);
bab1deea	529	err2:
c587aea9	530	kobject_put(&p->kobj);
30df94f8	531	p = NULL; /* kobject_put frees */
77f98598	532	err1:
019ee792	533	dev_set_allmulti(dev, -1);
43af8532 VL	534	put_back:
43af8532 VL	535	dev_put(dev);
bc3f9076	536	kfree(p);
1da177e4 LT	537	return err;
	538	}
	539
	540	/* called with RTNL */
	541	int br_del_if(struct net_bridge br, struct net_device dev)
	542	{
f350a0a8	543	struct net_bridge_port *p;
9be6dd65	544	bool changed_addr;
f350a0a8	545
ec1e5610	546	p = br_port_get_rtnl(dev);
b5ed54e9	547	if (!p \|\| p->br != br)
1da177e4 LT	548	return -EINVAL;
1da177e4 LT	549
d30362c0 AW	550	/* Since more than one interface can be attached to a bridge,
	551	* there still maybe an alternate path for netconsole to use;
	552	* therefore there is no reason for a NETDEV_RELEASE event.
	553	*/
1da177e4 LT	554	del_nbp(p);
	555
	556	spin_lock_bh(&br->lock);
9be6dd65	557	changed_addr = br_stp_recalculate_bridge_id(br);
1da177e4 LT	558	spin_unlock_bh(&br->lock);
1da177e4 LT	559
9be6dd65 AW	560	if (changed_addr)
	561	call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
	562
c4d27ef9 MM	563	netdev_update_features(br->dev);
c4d27ef9 MM	564
1da177e4 LT	565	return 0;
1da177e4 LT	566	}
e028e4b8 VY	567
	568	void br_port_flags_change(struct net_bridge_port *p, unsigned long mask)
	569	{
	570	struct net_bridge *br = p->br;
	571
	572	if (mask & BR_AUTO_MASK)
	573	nbp_update_port_count(br);
	574	}