mirror of https://gitee.com/openkylin/linux.git
97 lines
2.1 KiB
C
97 lines
2.1 KiB
C
/*
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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 <buytenh@gnu.org>
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*
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* $Id: br_notify.c,v 1.2 2000/02/21 15:51:34 davem Exp $
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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 "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 = dev->br_port;
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struct net_bridge *br;
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/* not a port of a bridge */
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if (p == NULL)
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return NOTIFY_DONE;
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br = p->br;
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spin_lock_bh(&br->lock);
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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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br_fdb_changeaddr(p, dev->dev_addr);
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br_stp_recalculate_bridge_id(br);
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break;
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case NETDEV_CHANGE: /* device is up but carrier changed */
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if (!(br->dev->flags & IFF_UP))
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break;
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if (netif_carrier_ok(dev)) {
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if (p->state == BR_STATE_DISABLED)
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br_stp_enable_port(p);
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} else {
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if (p->state != BR_STATE_DISABLED)
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br_stp_disable_port(p);
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}
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break;
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case NETDEV_FEAT_CHANGE:
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if (br->dev->flags & IFF_UP)
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br_features_recompute(br);
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/* could do recursive feature change notification
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* but who would care??
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*/
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break;
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case NETDEV_DOWN:
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if (br->dev->flags & IFF_UP)
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br_stp_disable_port(p);
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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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br_stp_enable_port(p);
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break;
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case NETDEV_UNREGISTER:
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spin_unlock_bh(&br->lock);
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br_del_if(br, dev);
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goto done;
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}
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spin_unlock_bh(&br->lock);
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done:
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return NOTIFY_DONE;
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}
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