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 * $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
21static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr);
22
23struct 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 */
33static 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 schedule_delayed_work(&p->carrier_check, BR_PORT_DEBOUNCE);
60 break;
61
62 case NETDEV_FEAT_CHANGE:
63 if (br->dev->flags & IFF_UP)
64 br_features_recompute(br);
65
66 /* could do recursive feature change notification
67 * but who would care??
68 */
69 break;
70
71 case NETDEV_DOWN:
72 if (br->dev->flags & IFF_UP)
73 br_stp_disable_port(p);
74 break;
75
76 case NETDEV_UP:
77 if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP))
78 br_stp_enable_port(p);
79 break;
80
81 case NETDEV_UNREGISTER:
82 spin_unlock_bh(&br->lock);
83 br_del_if(br, dev);
84 goto done;
85 }
86 spin_unlock_bh(&br->lock);
87
88 done:
89 return NOTIFY_DONE;
90}