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/rtnetlink.h>
  18
  19 #include "br_private.h"
  20
  21 static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr);
  22
  23 struct notifier_block br_device_notifier = {
  24         .notifier_call = br_device_event
  25 };
  26
  27 /*
  28  * Handle changes in state of network devices enslaved to a bridge.
  29  *
  30  * Note: don't care about up/down if bridge itself is down, because
  31  *     port state is checked when bridge is brought up.
  32  */
  33 static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
  34 {
  35         struct net_device *dev = ptr;
  36         struct net_bridge_port *p = dev->br_port;
  37         struct net_bridge *br;
  38
  39         /* not a port of a bridge */
  40         if (p == NULL)
  41                 return NOTIFY_DONE;
  42
  43         br = p->br;
  44
  45         spin_lock_bh(&br->lock);
  46         switch (event) {
  47         case NETDEV_CHANGEMTU:
  48                 dev_set_mtu(br->dev, br_min_mtu(br));
  49                 break;
  50
  51         case NETDEV_CHANGEADDR:
  52                 br_fdb_changeaddr(p, dev->dev_addr);
  53                 br_ifinfo_notify(RTM_NEWLINK, p);
  54                 br_stp_recalculate_bridge_id(br);
  55                 break;
  56
  57         case NETDEV_CHANGE:
  58                 if (br->dev->flags & IFF_UP)
  59                         if (schedule_delayed_work(&p->carrier_check,
  60                                                 BR_PORT_DEBOUNCE))
  61                                 dev_hold(dev);
  62                 break;
  63
  64         case NETDEV_FEAT_CHANGE:
  65                 if (br->dev->flags & IFF_UP)
  66                         br_features_recompute(br);
  67
  68                 /* could do recursive feature change notification
  69                  * but who would care??
  70                  */
  71                 break;
  72
  73         case NETDEV_DOWN:
  74                 if (br->dev->flags & IFF_UP)
  75                         br_stp_disable_port(p);
  76                 break;
  77
  78         case NETDEV_UP:
  79                 if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP))
  80                         br_stp_enable_port(p);
  81                 break;
  82
  83         case NETDEV_UNREGISTER:
  84                 spin_unlock_bh(&br->lock);
  85                 br_del_if(br, dev);
  86                 goto done;
  87         }
  88         spin_unlock_bh(&br->lock);
  89
  90  done:
  91         return NOTIFY_DONE;
  92 }