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

/*
 *	Device event handling
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<[email protected]>
 *
 *	$Id: br_notify.c,v 1.2 2000/02/21 15:51:34 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/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 <[email protected]>
	7	*
	8	* $Id: br_notify.c,v 1.2 2000/02/21 15:51:34 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>
11dc1f36	17	#include <linux/rtnetlink.h>
e9dc8653	18	#include <net/net_namespace.h>
1da177e4 LT	19
	20	#include "br_private.h"
	21
	22	static int br_device_event(struct notifier_block unused, unsigned long event, void ptr);
	23
	24	struct notifier_block br_device_notifier = {
	25	.notifier_call = br_device_event
	26	};
	27
	28	/*
	29	* Handle changes in state of network devices enslaved to a bridge.
9d6f229f	30	*
1da177e4 LT	31	* Note: don't care about up/down if bridge itself is down, because
	32	* port state is checked when bridge is brought up.
	33	*/
	34	static int br_device_event(struct notifier_block unused, unsigned long event, void ptr)
	35	{
	36	struct net_device *dev = ptr;
	37	struct net_bridge_port *p = dev->br_port;
	38	struct net_bridge *br;
	39
c346dca1	40	if (dev_net(dev) != &init_net)
e9dc8653 EB	41	return NOTIFY_DONE;
e9dc8653 EB	42
1da177e4 LT	43	/* not a port of a bridge */
	44	if (p == NULL)
	45	return NOTIFY_DONE;
	46
	47	br = p->br;
	48
1da177e4 LT	49	switch (event) {
	50	case NETDEV_CHANGEMTU:
	51	dev_set_mtu(br->dev, br_min_mtu(br));
	52	break;
	53
	54	case NETDEV_CHANGEADDR:
269def7c	55	spin_lock_bh(&br->lock);
1da177e4 LT	56	br_fdb_changeaddr(p, dev->dev_addr);
1da177e4 LT	57	br_stp_recalculate_bridge_id(br);
269def7c	58	spin_unlock_bh(&br->lock);
1da177e4 LT	59	break;
1da177e4 LT	60
4433f420	61	case NETDEV_CHANGE:
269def7c	62	br_port_carrier_check(p);
1da177e4 LT	63	break;
1da177e4 LT	64
81d35307	65	case NETDEV_FEAT_CHANGE:
269def7c SH	66	spin_lock_bh(&br->lock);
269def7c SH	67	if (netif_running(br->dev))
81d35307	68	br_features_recompute(br);
269def7c	69	spin_unlock_bh(&br->lock);
81d35307 SH	70	break;
81d35307 SH	71
1da177e4	72	case NETDEV_DOWN:
269def7c	73	spin_lock_bh(&br->lock);
1da177e4 LT	74	if (br->dev->flags & IFF_UP)
1da177e4 LT	75	br_stp_disable_port(p);
269def7c	76	spin_unlock_bh(&br->lock);
1da177e4 LT	77	break;
	78
	79	case NETDEV_UP:
b86c4503 SH	80	if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) {
b86c4503 SH	81	spin_lock_bh(&br->lock);
1da177e4	82	br_stp_enable_port(p);
b86c4503 SH	83	spin_unlock_bh(&br->lock);
b86c4503 SH	84	}
1da177e4 LT	85	break;
	86
	87	case NETDEV_UNREGISTER:
1da177e4	88	br_del_if(br, dev);
269def7c	89	break;
9d6f229f	90	}
1da177e4	91
b86c4503 SH	92	/* Events that may cause spanning tree to refresh */
	93	if (event == NETDEV_CHANGEADDR \|\| event == NETDEV_UP \|\|
	94	event == NETDEV_CHANGE \|\| event == NETDEV_DOWN)
	95	br_ifinfo_notify(RTM_NEWLINK, p);
	96
1da177e4 LT	97	return NOTIFY_DONE;
1da177e4 LT	98	}