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
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 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_FEAT_CHANGE:
69 if (br->dev->flags & IFF_UP)
70 br_features_recompute(br);
71
72 /* could do recursive feature change notification
73 * but who would care??
74 */
75 break;
76
77 case NETDEV_DOWN:
78 if (br->dev->flags & IFF_UP)
79 br_stp_disable_port(p);
80 break;
81
82 case NETDEV_UP:
83 if (netif_carrier_ok(dev) && (br->dev->flags & IFF_UP))
84 br_stp_enable_port(p);
85 break;
86
87 case NETDEV_UNREGISTER:
88 spin_unlock_bh(&br->lock);
89 br_del_if(br, dev);
90 goto done;
91 }
92 spin_unlock_bh(&br->lock);
93
94 done:
95 return NOTIFY_DONE;
96}