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