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 #include <linux/if_bridge.h>
  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         br_device_event,
  25         NULL,
  26         0
  27 };
  28
  29 static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
  30 {
  31         struct net_device *dev;
  32         struct net_bridge_port *p;
  33
  34         dev = ptr;
  35         p = dev->br_port;
  36
  37         if (p == NULL)
  38                 return NOTIFY_DONE;
  39
  40         switch (event)
  41         {
  42         case NETDEV_CHANGEADDR:
  43                 read_lock(&p->br->lock);
  44                 br_fdb_changeaddr(p, dev->dev_addr);
  45                 br_stp_recalculate_bridge_id(p->br);
  46                 read_unlock(&p->br->lock);
  47                 break;
  48
  49         case NETDEV_GOING_DOWN:
  50                 /* extend the protocol to send some kind of notification? */
  51                 break;
  52
  53         case NETDEV_DOWN:
  54                 if (p->br->dev.flags & IFF_UP) {
  55                         read_lock(&p->br->lock);
  56                         br_stp_disable_port(dev->br_port);
  57                         read_unlock(&p->br->lock);
  58                 }
  59                 break;
  60
  61         case NETDEV_UP:
  62                 if (p->br->dev.flags & IFF_UP) {
  63                         read_lock(&p->br->lock);
  64                         br_stp_enable_port(dev->br_port);
  65                         read_unlock(&p->br->lock);
  66                 }
  67                 break;
  68
  69         case NETDEV_UNREGISTER:
  70                 br_del_if(dev->br_port->br, dev);
  71                 break;
  72         }
  73
  74         return NOTIFY_DONE;
  75 }