1/* 2 * Device event handling 3 * Linux ethernet bridge 4 * 5 * Authors: 6 * Lennert Buytenhek <buytenh@gnu.org> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * as published by the Free Software Foundation; either version 11 * 2 of the License, or (at your option) any later version. 12 */ 13 14#include <linux/kernel.h> 15#include <linux/rtnetlink.h> 16#include <net/net_namespace.h> 17 18#include "br_private.h" 19 20static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr); 21 22struct notifier_block br_device_notifier = { 23 .notifier_call = br_device_event 24}; 25 26/* 27 * Handle changes in state of network devices enslaved to a bridge. 28 * 29 * Note: don't care about up/down if bridge itself is down, because 30 * port state is checked when bridge is brought up. 31 */ 32static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr) 33{ 34 struct net_device *dev = ptr; 35 struct net_bridge_port *p; 36 struct net_bridge *br; 37 bool changed_addr; 38 int err; 39 40 /* register of bridge completed, add sysfs entries */ 41 if ((dev->priv_flags & IFF_EBRIDGE) && event == NETDEV_REGISTER) { 42 br_sysfs_addbr(dev); 43 return NOTIFY_DONE; 44 } 45 46 /* not a port of a bridge */ 47 p = br_port_get_rtnl(dev); 48 if (!p) 49 return NOTIFY_DONE; 50 51 br = p->br; 52 53 switch (event) { 54 case NETDEV_CHANGEMTU: 55 dev_set_mtu(br->dev, br_min_mtu(br)); 56 break; 57 58 case NETDEV_CHANGEADDR: 59 spin_lock_bh(&br->lock); 60 br_fdb_changeaddr(p, dev->dev_addr); 61 changed_addr = br_stp_recalculate_bridge_id(br); 62 spin_unlock_bh(&br->lock); 63 64 if (changed_addr) 65 call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); 66 67 break; 68 69 case NETDEV_CHANGE: 70 br_port_carrier_check(p); 71 break; 72 73 case NETDEV_FEAT_CHANGE: 74 netdev_update_features(br->dev); 75 break; 76 77 case NETDEV_DOWN: 78 spin_lock_bh(&br->lock); 79 if (br->dev->flags & IFF_UP) 80 br_stp_disable_port(p); 81 spin_unlock_bh(&br->lock); 82 break; 83 84 case NETDEV_UP: 85 if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) { 86 spin_lock_bh(&br->lock); 87 br_stp_enable_port(p); 88 spin_unlock_bh(&br->lock); 89 } 90 break; 91 92 case NETDEV_UNREGISTER: 93 br_del_if(br, dev); 94 break; 95 96 case NETDEV_CHANGENAME: 97 err = br_sysfs_renameif(p); 98 if (err) 99 return notifier_from_errno(err); 100 break; 101 102 case NETDEV_PRE_TYPE_CHANGE: 103 /* Forbid underlaying device to change its type. */ 104 return NOTIFY_BAD; 105 } 106 107 /* Events that may cause spanning tree to refresh */ 108 if (event == NETDEV_CHANGEADDR || event == NETDEV_UP || 109 event == NETDEV_CHANGE || event == NETDEV_DOWN) 110 br_ifinfo_notify(RTM_NEWLINK, p); 111 112 return NOTIFY_DONE; 113} 114