tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 = 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 switch (event) {
45 case NETDEV_CHANGEMTU:
46 dev_set_mtu(br->dev, br_min_mtu(br));
47 break;
48
49 case NETDEV_CHANGEADDR:
50 spin_lock_bh(&br->lock);
51 br_fdb_changeaddr(p, dev->dev_addr);
52 br_stp_recalculate_bridge_id(br);
53 spin_unlock_bh(&br->lock);
54 break;
55
56 case NETDEV_CHANGE:
57 br_port_carrier_check(p);
58 break;
59
60 case NETDEV_FEAT_CHANGE:
61 spin_lock_bh(&br->lock);
62 if (netif_running(br->dev))
63 br_features_recompute(br);
64 spin_unlock_bh(&br->lock);
65 break;
66
67 case NETDEV_DOWN:
68 spin_lock_bh(&br->lock);
69 if (br->dev->flags & IFF_UP)
70 br_stp_disable_port(p);
71 spin_unlock_bh(&br->lock);
72 break;
73
74 case NETDEV_UP:
75 if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP)) {
76 spin_lock_bh(&br->lock);
77 br_stp_enable_port(p);
78 spin_unlock_bh(&br->lock);
79 }
80 break;
81
82 case NETDEV_UNREGISTER:
83 br_del_if(br, dev);
84 break;
85 }
86
87 /* Events that may cause spanning tree to refresh */
88 if (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
89 event == NETDEV_CHANGE || event == NETDEV_DOWN)
90 br_ifinfo_notify(RTM_NEWLINK, p);
91
92 return NOTIFY_DONE;
93}