| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | .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 | */ |
| 32 | static 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 = dev->br_port; |
| 36 | struct net_bridge *br; |
| 37 | |
| 38 | /* not a port of a bridge */ |
| 39 | if (p == NULL) |
| 40 | return NOTIFY_DONE; |
| 41 | |
| 42 | br = p->br; |
| 43 | |
| 44 | spin_lock_bh(&br->lock); |
| 45 | switch (event) { |
| 46 | case NETDEV_CHANGEMTU: |
| 47 | dev_set_mtu(br->dev, br_min_mtu(br)); |
| 48 | break; |
| 49 | |
| 50 | case NETDEV_CHANGEADDR: |
| 51 | br_fdb_changeaddr(p, dev->dev_addr); |
| 52 | br_stp_recalculate_bridge_id(br); |
| 53 | break; |
| 54 | |
| 55 | case NETDEV_CHANGE: /* device is up but carrier changed */ |
| 56 | if (!(br->dev->flags & IFF_UP)) |
| 57 | break; |
| 58 | |
| 59 | if (netif_carrier_ok(dev)) { |
| 60 | if (p->state == BR_STATE_DISABLED) |
| 61 | br_stp_enable_port(p); |
| 62 | } else { |
| 63 | if (p->state != BR_STATE_DISABLED) |
| 64 | br_stp_disable_port(p); |
| 65 | } |
| 66 | break; |
| 67 | |
| 68 | case NETDEV_DOWN: |
| 69 | if (br->dev->flags & IFF_UP) |
| 70 | br_stp_disable_port(p); |
| 71 | break; |
| 72 | |
| 73 | case NETDEV_UP: |
| 74 | if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) |
| 75 | br_stp_enable_port(p); |
| 76 | break; |
| 77 | |
| 78 | case NETDEV_UNREGISTER: |
| 79 | spin_unlock_bh(&br->lock); |
| 80 | br_del_if(br, dev); |
| 81 | goto done; |
| 82 | } |
| 83 | spin_unlock_bh(&br->lock); |
| 84 | |
| 85 | done: |
| 86 | return NOTIFY_DONE; |
| 87 | } |