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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/net/bridge/br_notify.c
15109 views
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/*

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 *	Device event handling

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 *	Linux ethernet bridge

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 *

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 *	Authors:

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 *	Lennert Buytenhek		<[email protected]>

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 *

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 *	This program is free software; you can redistribute it and/or

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 *	modify it under the terms of the GNU General Public License

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 *	as published by the Free Software Foundation; either version

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 *	2 of the License, or (at your option) any later version.

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 */

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#include <linux/kernel.h>

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#include <linux/rtnetlink.h>

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#include <net/net_namespace.h>

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#include "br_private.h"

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

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struct notifier_block br_device_notifier = {

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	.notifier_call = br_device_event

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};

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/*

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 * Handle changes in state of network devices enslaved to a bridge.

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 *

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 * Note: don't care about up/down if bridge itself is down, because

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 *     port state is checked when bridge is brought up.

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 */

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

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{

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	struct net_device *dev = ptr;

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	struct net_bridge_port *p;

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	struct net_bridge *br;

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	int err;

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	/* register of bridge completed, add sysfs entries */

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	if ((dev->priv_flags & IFF_EBRIDGE) && event == NETDEV_REGISTER) {

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		br_sysfs_addbr(dev);

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		return NOTIFY_DONE;

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	}

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	/* not a port of a bridge */

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	p = br_port_get_rtnl(dev);

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	if (!p)

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		return NOTIFY_DONE;

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	br = p->br;

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	switch (event) {

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	case NETDEV_CHANGEMTU:

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		dev_set_mtu(br->dev, br_min_mtu(br));

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		break;

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	case NETDEV_CHANGEADDR:

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		spin_lock_bh(&br->lock);

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		br_fdb_changeaddr(p, dev->dev_addr);

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		br_stp_recalculate_bridge_id(br);

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		spin_unlock_bh(&br->lock);

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		break;

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	case NETDEV_CHANGE:

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		br_port_carrier_check(p);

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		break;

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	case NETDEV_FEAT_CHANGE:

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		netdev_update_features(br->dev);

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		break;

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	case NETDEV_DOWN:

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		spin_lock_bh(&br->lock);

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		if (br->dev->flags & IFF_UP)

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			br_stp_disable_port(p);

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		spin_unlock_bh(&br->lock);

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		break;

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	case NETDEV_UP:

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		if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) {

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			spin_lock_bh(&br->lock);

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			br_stp_enable_port(p);

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			spin_unlock_bh(&br->lock);

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		}

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		break;

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	case NETDEV_UNREGISTER:

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		br_del_if(br, dev);

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		break;

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	case NETDEV_CHANGENAME:

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		err = br_sysfs_renameif(p);

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		if (err)

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			return notifier_from_errno(err);

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		break;

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	case NETDEV_PRE_TYPE_CHANGE:

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		/* Forbid underlaying device to change its type. */

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		return NOTIFY_BAD;

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	}

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	/* Events that may cause spanning tree to refresh */

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	if (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||

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	    event == NETDEV_CHANGE || event == NETDEV_DOWN)

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		br_ifinfo_notify(RTM_NEWLINK, p);

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	return NOTIFY_DONE;

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}

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