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| 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 | |
| 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; |
| 36 | struct net_bridge *br; |
| 37 | int err; |
| 38 | |
| 39 | /* not a port of a bridge */ |
| 40 | p = br_port_get_rtnl(dev); |
| 41 | if (!p) |
| 42 | return NOTIFY_DONE; |
| 43 | |
| 44 | br = p->br; |
| 45 | |
| 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 | spin_lock_bh(&br->lock); |
| 53 | br_fdb_changeaddr(p, dev->dev_addr); |
| 54 | br_stp_recalculate_bridge_id(br); |
| 55 | spin_unlock_bh(&br->lock); |
| 56 | break; |
| 57 | |
| 58 | case NETDEV_CHANGE: |
| 59 | br_port_carrier_check(p); |
| 60 | break; |
| 61 | |
| 62 | case NETDEV_FEAT_CHANGE: |
| 63 | spin_lock_bh(&br->lock); |
| 64 | if (netif_running(br->dev)) |
| 65 | br_features_recompute(br); |
| 66 | spin_unlock_bh(&br->lock); |
| 67 | break; |
| 68 | |
| 69 | case NETDEV_DOWN: |
| 70 | spin_lock_bh(&br->lock); |
| 71 | if (br->dev->flags & IFF_UP) |
| 72 | br_stp_disable_port(p); |
| 73 | spin_unlock_bh(&br->lock); |
| 74 | break; |
| 75 | |
| 76 | case NETDEV_UP: |
| 77 | if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) { |
| 78 | spin_lock_bh(&br->lock); |
| 79 | br_stp_enable_port(p); |
| 80 | spin_unlock_bh(&br->lock); |
| 81 | } |
| 82 | break; |
| 83 | |
| 84 | case NETDEV_UNREGISTER: |
| 85 | br_del_if(br, dev); |
| 86 | break; |
| 87 | |
| 88 | case NETDEV_CHANGENAME: |
| 89 | err = br_sysfs_renameif(p); |
| 90 | if (err) |
| 91 | return notifier_from_errno(err); |
| 92 | break; |
| 93 | |
| 94 | case NETDEV_PRE_TYPE_CHANGE: |
| 95 | /* Forbid underlaying device to change its type. */ |
| 96 | return NOTIFY_BAD; |
| 97 | } |
| 98 | |
| 99 | /* Events that may cause spanning tree to refresh */ |
| 100 | if (event == NETDEV_CHANGEADDR || event == NETDEV_UP || |
| 101 | event == NETDEV_CHANGE || event == NETDEV_DOWN) |
| 102 | br_ifinfo_notify(RTM_NEWLINK, p); |
| 103 | |
| 104 | return NOTIFY_DONE; |
| 105 | } |
| 106 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9
