[GitHub/mt8127/android_kernel_alcatel_ttab.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;
	struct net_bridge *br;
	bool changed_addr;
	int err;

	/* register of bridge completed, add sysfs entries */
	if ((dev->priv_flags & IFF_EBRIDGE) && event == NETDEV_REGISTER) {
		br_sysfs_addbr(dev);
		return NOTIFY_DONE;
	}

	/* not a port of a bridge */
	p = br_port_get_rtnl(dev);
	if (!p)
		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);
		changed_addr = br_stp_recalculate_bridge_id(br);
		spin_unlock_bh(&br->lock);

		if (changed_addr)
			call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);

		break;

	case NETDEV_CHANGE:
		br_port_carrier_check(p);
		break;

	case NETDEV_FEAT_CHANGE:
		netdev_update_features(br->dev);
		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;

	case NETDEV_CHANGENAME:
		err = br_sysfs_renameif(p);
		if (err)
			return notifier_from_errno(err);
		break;

	case NETDEV_PRE_TYPE_CHANGE:
		/* Forbid underlaying device to change its type. */
		return NOTIFY_BAD;
	}

	/* 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;
b5ed54e9	35	struct net_bridge_port *p;
1da177e4	36	struct net_bridge *br;
9be6dd65	37	bool changed_addr;
e0f43752	38	int err;
1da177e4	39
bb900b27	40	/* register of bridge completed, add sysfs entries */
28674b97	41	if ((dev->priv_flags & IFF_EBRIDGE) && event == NETDEV_REGISTER) {
bb900b27	42	br_sysfs_addbr(dev);
	43	return NOTIFY_DONE;
	44	}
	45
1da177e4	46	/* not a port of a bridge */
ec1e5610 ED	47	p = br_port_get_rtnl(dev);
ec1e5610 ED	48	if (!p)
1da177e4 LT	49	return NOTIFY_DONE;
	50
	51	br = p->br;
	52
1da177e4 LT	53	switch (event) {
	54	case NETDEV_CHANGEMTU:
	55	dev_set_mtu(br->dev, br_min_mtu(br));
	56	break;
	57
	58	case NETDEV_CHANGEADDR:
269def7c	59	spin_lock_bh(&br->lock);
1da177e4	60	br_fdb_changeaddr(p, dev->dev_addr);
9be6dd65	61	changed_addr = br_stp_recalculate_bridge_id(br);
269def7c	62	spin_unlock_bh(&br->lock);
9be6dd65 AW	63
	64	if (changed_addr)
	65	call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
	66
1da177e4 LT	67	break;
1da177e4 LT	68
4433f420	69	case NETDEV_CHANGE:
269def7c	70	br_port_carrier_check(p);
1da177e4 LT	71	break;
1da177e4 LT	72
81d35307	73	case NETDEV_FEAT_CHANGE:
c4d27ef9	74	netdev_update_features(br->dev);
81d35307 SH	75	break;
81d35307 SH	76
1da177e4	77	case NETDEV_DOWN:
269def7c	78	spin_lock_bh(&br->lock);
1da177e4 LT	79	if (br->dev->flags & IFF_UP)
1da177e4 LT	80	br_stp_disable_port(p);
269def7c	81	spin_unlock_bh(&br->lock);
1da177e4 LT	82	break;
	83
	84	case NETDEV_UP:
b86c4503 SH	85	if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) {
b86c4503 SH	86	spin_lock_bh(&br->lock);
1da177e4	87	br_stp_enable_port(p);
b86c4503 SH	88	spin_unlock_bh(&br->lock);
b86c4503 SH	89	}
1da177e4 LT	90	break;
	91
	92	case NETDEV_UNREGISTER:
1da177e4	93	br_del_if(br, dev);
269def7c	94	break;
1c01fe14	95
e0f43752 SA	96	case NETDEV_CHANGENAME:
	97	err = br_sysfs_renameif(p);
	98	if (err)
	99	return notifier_from_errno(err);
	100	break;
	101
1c01fe14 JP	102	case NETDEV_PRE_TYPE_CHANGE:
	103	/* Forbid underlaying device to change its type. */
	104	return NOTIFY_BAD;
9d6f229f	105	}
1da177e4	106
b86c4503 SH	107	/* Events that may cause spanning tree to refresh */
	108	if (event == NETDEV_CHANGEADDR \|\| event == NETDEV_UP \|\|
	109	event == NETDEV_CHANGE \|\| event == NETDEV_DOWN)
	110	br_ifinfo_notify(RTM_NEWLINK, p);
	111
1da177e4 LT	112	return NOTIFY_DONE;
1da177e4 LT	113	}