net/bridge/br_notify.c

   1 /*
   2  *      Device event handling
   3  *      Linux ethernet bridge
   4  *
   5  *      Authors:
   6  *      Lennert Buytenhek               <buytenh@gnu.org>
   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>
  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 {
  24         .notifier_call = br_device_event
  25 };
  26
  27 static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
  28 {
  29         struct net_device *dev;
  30         struct net_bridge_port *p;
  31         struct net_bridge *br;
  32
  33         dev = ptr;
  34         p = dev->br_port;
  35
  36         if (p == NULL)
  37                 return NOTIFY_DONE;
  38
  39         br = p->br;
  40
  41         switch (event) {
  42         case NETDEV_CHANGEADDR:
  43                 spin_lock_bh(&br->lock);
  44                 br_fdb_changeaddr(p, dev->dev_addr);
  45                 if (br->dev->flags & IFF_UP)
  46                         br_stp_recalculate_bridge_id(br);
  47                 spin_unlock_bh(&br->lock);
  48                 break;
  49
  50         case NETDEV_DOWN:
  51                 if (br->dev->flags & IFF_UP) {
  52                         spin_lock_bh(&br->lock);
  53                         br_stp_disable_port(p);
  54                         spin_unlock_bh(&br->lock);
  55                 }
  56                 break;
  57
  58         case NETDEV_UP:
  59                 if (br->dev->flags & IFF_UP) {
  60                         spin_lock_bh(&br->lock);
  61                         br_stp_enable_port(p);
  62                         spin_unlock_bh(&br->lock);
  63                 }
  64                 break;
  65
  66         case NETDEV_UNREGISTER:
  67                 br_del_if(br, dev);
  68                 break;
  69         }
  70
  71         return NOTIFY_DONE;
  72 }