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

/*
 *	Device event handling
 *	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/rtnetlink.h>
#include <net/net_namespace.h>

#include "br_private.h"

static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr);

struct notifier_block br_device_notifier = {
	.notifier_call = br_device_event
};

/*
 * Handle changes in state of network devices enslaved to a bridge.
 *
 * Note: don't care about up/down if bridge itself is down, because
 *     port state is checked when bridge is brought up.
 */
static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
{
	struct net_device *dev = ptr;
	struct net_bridge_port *p = dev->br_port;
	struct net_bridge *br;

	if (dev_net(dev) != &init_net)
		return NOTIFY_DONE;

	/* not a port of a bridge */
	if (p == NULL)
		return NOTIFY_DONE;

	br = p->br;

	switch (event) {
	case NETDEV_CHANGEMTU:
		dev_set_mtu(br->dev, br_min_mtu(br));
		break;

	case NETDEV_CHANGEADDR:
		spin_lock_bh(&br->lock);
		br_fdb_changeaddr(p, dev->dev_addr);
		br_stp_recalculate_bridge_id(br);
		spin_unlock_bh(&br->lock);
		break;

	case NETDEV_CHANGE:
		br_port_carrier_check(p);
		break;

	case NETDEV_FEAT_CHANGE:
		spin_lock_bh(&br->lock);
		if (netif_running(br->dev))
			br_features_recompute(br);
		spin_unlock_bh(&br->lock);
		break;

	case NETDEV_DOWN:
		spin_lock_bh(&br->lock);
		if (br->dev->flags & IFF_UP)
			br_stp_disable_port(p);
		spin_unlock_bh(&br->lock);
		break;

	case NETDEV_UP:
		if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) {
			spin_lock_bh(&br->lock);
			br_stp_enable_port(p);
			spin_unlock_bh(&br->lock);
		}
		break;

	case NETDEV_UNREGISTER:
		br_del_if(br, dev);
		break;
	}

	/* Events that may cause spanning tree to refresh */
	if (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
	    event == NETDEV_CHANGE || event == NETDEV_DOWN)
		br_ifinfo_notify(RTM_NEWLINK, p);

	return NOTIFY_DONE;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Device event handling
	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>
11dc1f36	15	#include <linux/rtnetlink.h>
e9dc8653	16	#include <net/net_namespace.h>
1da177e4 LT	17
	18	#include "br_private.h"
	19
	20	static int br_device_event(struct notifier_block unused, unsigned long event, void ptr);
	21
	22	struct notifier_block br_device_notifier = {
	23	.notifier_call = br_device_event
	24	};
	25
	26	/*
	27	* Handle changes in state of network devices enslaved to a bridge.
9d6f229f	28	*
1da177e4 LT	29	* Note: don't care about up/down if bridge itself is down, because
	30	* port state is checked when bridge is brought up.
	31	*/
	32	static int br_device_event(struct notifier_block unused, unsigned long event, void ptr)
	33	{
	34	struct net_device *dev = ptr;
	35	struct net_bridge_port *p = dev->br_port;
	36	struct net_bridge *br;
	37
c346dca1	38	if (dev_net(dev) != &init_net)
e9dc8653 EB	39	return NOTIFY_DONE;
e9dc8653 EB	40
1da177e4 LT	41	/* not a port of a bridge */
	42	if (p == NULL)
	43	return NOTIFY_DONE;
	44
	45	br = p->br;
	46
1da177e4 LT	47	switch (event) {
	48	case NETDEV_CHANGEMTU:
	49	dev_set_mtu(br->dev, br_min_mtu(br));
	50	break;
	51
	52	case NETDEV_CHANGEADDR:
269def7c	53	spin_lock_bh(&br->lock);
1da177e4 LT	54	br_fdb_changeaddr(p, dev->dev_addr);
1da177e4 LT	55	br_stp_recalculate_bridge_id(br);
269def7c	56	spin_unlock_bh(&br->lock);
1da177e4 LT	57	break;
1da177e4 LT	58
4433f420	59	case NETDEV_CHANGE:
269def7c	60	br_port_carrier_check(p);
1da177e4 LT	61	break;
1da177e4 LT	62
81d35307	63	case NETDEV_FEAT_CHANGE:
269def7c SH	64	spin_lock_bh(&br->lock);
269def7c SH	65	if (netif_running(br->dev))
81d35307	66	br_features_recompute(br);
269def7c	67	spin_unlock_bh(&br->lock);
81d35307 SH	68	break;
81d35307 SH	69
1da177e4	70	case NETDEV_DOWN:
269def7c	71	spin_lock_bh(&br->lock);
1da177e4 LT	72	if (br->dev->flags & IFF_UP)
1da177e4 LT	73	br_stp_disable_port(p);
269def7c	74	spin_unlock_bh(&br->lock);
1da177e4 LT	75	break;
	76
	77	case NETDEV_UP:
b86c4503 SH	78	if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) {
b86c4503 SH	79	spin_lock_bh(&br->lock);
1da177e4	80	br_stp_enable_port(p);
b86c4503 SH	81	spin_unlock_bh(&br->lock);
b86c4503 SH	82	}
1da177e4 LT	83	break;
	84
	85	case NETDEV_UNREGISTER:
1da177e4	86	br_del_if(br, dev);
269def7c	87	break;
9d6f229f	88	}
1da177e4	89
b86c4503 SH	90	/* Events that may cause spanning tree to refresh */
	91	if (event == NETDEV_CHANGEADDR \|\| event == NETDEV_UP \|\|
	92	event == NETDEV_CHANGE \|\| event == NETDEV_DOWN)
	93	br_ifinfo_notify(RTM_NEWLINK, p);
	94
1da177e4 LT	95	return NOTIFY_DONE;
1da177e4 LT	96	}