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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Generic parts
3 * Linux ethernet bridge
4 *
5 * Authors:
6 * Lennert Buytenhek <buytenh@gnu.org>
7 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
18#include <linux/init.h>
Stephen Hemmingercf0f02d2006-03-20 22:59:06 -080019#include <linux/llc.h>
20#include <net/llc.h>
Patrick McHardy7c85fbf2008-07-05 21:25:56 -070021#include <net/stp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
23#include "br_private.h"
24
Cong Wangb1282722014-05-20 17:30:00 -070025/*
26 * Handle changes in state of network devices enslaved to a bridge.
27 *
28 * Note: don't care about up/down if bridge itself is down, because
29 * port state is checked when bridge is brought up.
30 */
31static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
32{
33 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
34 struct net_bridge_port *p;
35 struct net_bridge *br;
36 bool changed_addr;
37 int err;
38
39 /* register of bridge completed, add sysfs entries */
40 if ((dev->priv_flags & IFF_EBRIDGE) && event == NETDEV_REGISTER) {
41 br_sysfs_addbr(dev);
42 return NOTIFY_DONE;
43 }
44
45 /* not a port of a bridge */
46 p = br_port_get_rtnl(dev);
47 if (!p)
48 return NOTIFY_DONE;
49
50 br = p->br;
51
52 switch (event) {
53 case NETDEV_CHANGEMTU:
54 dev_set_mtu(br->dev, br_min_mtu(br));
55 break;
56
57 case NETDEV_CHANGEADDR:
58 spin_lock_bh(&br->lock);
59 br_fdb_changeaddr(p, dev->dev_addr);
60 changed_addr = br_stp_recalculate_bridge_id(br);
61 spin_unlock_bh(&br->lock);
62
63 if (changed_addr)
64 call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
65
66 break;
67
68 case NETDEV_CHANGE:
69 br_port_carrier_check(p);
70 break;
71
72 case NETDEV_FEAT_CHANGE:
73 netdev_update_features(br->dev);
74 break;
75
76 case NETDEV_DOWN:
77 spin_lock_bh(&br->lock);
78 if (br->dev->flags & IFF_UP)
79 br_stp_disable_port(p);
80 spin_unlock_bh(&br->lock);
81 break;
82
83 case NETDEV_UP:
84 if (netif_running(br->dev) && netif_oper_up(dev)) {
85 spin_lock_bh(&br->lock);
86 br_stp_enable_port(p);
87 spin_unlock_bh(&br->lock);
88 }
89 break;
90
91 case NETDEV_UNREGISTER:
92 br_del_if(br, dev);
93 break;
94
95 case NETDEV_CHANGENAME:
96 err = br_sysfs_renameif(p);
97 if (err)
98 return notifier_from_errno(err);
99 break;
100
101 case NETDEV_PRE_TYPE_CHANGE:
102 /* Forbid underlaying device to change its type. */
103 return NOTIFY_BAD;
104
105 case NETDEV_RESEND_IGMP:
106 /* Propagate to master device */
107 call_netdevice_notifiers(event, br->dev);
108 break;
109 }
110
111 /* Events that may cause spanning tree to refresh */
112 if (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
113 event == NETDEV_CHANGE || event == NETDEV_DOWN)
114 br_ifinfo_notify(RTM_NEWLINK, p);
115
116 return NOTIFY_DONE;
117}
118
119static struct notifier_block br_device_notifier = {
120 .notifier_call = br_device_event
121};
122
WANG Congb86f81cc2014-01-10 13:58:47 -0800123static void __net_exit br_net_exit(struct net *net)
124{
125 struct net_device *dev;
126 LIST_HEAD(list);
127
128 rtnl_lock();
129 for_each_netdev(net, dev)
130 if (dev->priv_flags & IFF_EBRIDGE)
131 br_dev_delete(dev, &list);
132
133 unregister_netdevice_many(&list);
134 rtnl_unlock();
135
136}
Stephen Hemmingercf0f02d2006-03-20 22:59:06 -0800137
Alexey Dobriyan712d6952008-09-08 16:20:18 -0700138static struct pernet_operations br_net_ops = {
139 .exit = br_net_exit,
140};
141
WANG Congb86f81cc2014-01-10 13:58:47 -0800142static const struct stp_proto br_stp_proto = {
143 .rcv = br_stp_rcv,
144};
145
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146static int __init br_init(void)
147{
Stephen Hemmingerc0909712006-05-25 15:59:33 -0700148 int err;
149
Patrick McHardy7c85fbf2008-07-05 21:25:56 -0700150 err = stp_proto_register(&br_stp_proto);
151 if (err < 0) {
stephen hemminger28a16c92010-05-10 09:31:09 +0000152 pr_err("bridge: can't register sap for STP\n");
Patrick McHardy7c85fbf2008-07-05 21:25:56 -0700153 return err;
Stephen Hemmingercf0f02d2006-03-20 22:59:06 -0800154 }
155
Akinobu Mita87a596e2007-04-07 18:57:07 +0900156 err = br_fdb_init();
157 if (err)
Pavel Emelyanov17efdd42007-11-29 23:41:43 +1100158 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
Alexey Dobriyan712d6952008-09-08 16:20:18 -0700160 err = register_pernet_subsys(&br_net_ops);
Stephen Hemmingerc0909712006-05-25 15:59:33 -0700161 if (err)
162 goto err_out1;
163
Alexey Dobriyan712d6952008-09-08 16:20:18 -0700164 err = br_netfilter_init();
Stephen Hemmingerc0909712006-05-25 15:59:33 -0700165 if (err)
166 goto err_out2;
167
Alexey Dobriyan712d6952008-09-08 16:20:18 -0700168 err = register_netdevice_notifier(&br_device_notifier);
Thomas Graf32fe21c2007-03-22 11:59:03 -0700169 if (err)
170 goto err_out3;
171
Alexey Dobriyan712d6952008-09-08 16:20:18 -0700172 err = br_netlink_init();
173 if (err)
174 goto err_out4;
175
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 brioctl_set(br_ioctl_deviceless_stub);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
Igor Maraviće6373c42011-12-12 02:58:25 +0000178#if IS_ENABLED(CONFIG_ATM_LANE)
Michał Mirosławda678292009-06-05 05:35:28 +0000179 br_fdb_test_addr_hook = br_fdb_test_addr;
180#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 return 0;
Alexey Dobriyan712d6952008-09-08 16:20:18 -0700183err_out4:
Thomas Graf32fe21c2007-03-22 11:59:03 -0700184 unregister_netdevice_notifier(&br_device_notifier);
Alexey Dobriyan712d6952008-09-08 16:20:18 -0700185err_out3:
Stephen Hemmingerc0909712006-05-25 15:59:33 -0700186 br_netfilter_fini();
Alexey Dobriyan712d6952008-09-08 16:20:18 -0700187err_out2:
188 unregister_pernet_subsys(&br_net_ops);
Stephen Hemmingerc0909712006-05-25 15:59:33 -0700189err_out1:
Pavel Emelyanov17efdd42007-11-29 23:41:43 +1100190 br_fdb_fini();
191err_out:
Patrick McHardy7c85fbf2008-07-05 21:25:56 -0700192 stp_proto_unregister(&br_stp_proto);
Stephen Hemmingerc0909712006-05-25 15:59:33 -0700193 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194}
195
196static void __exit br_deinit(void)
197{
Patrick McHardy7c85fbf2008-07-05 21:25:56 -0700198 stp_proto_unregister(&br_stp_proto);
Stephen Hemmingercf0f02d2006-03-20 22:59:06 -0800199
Stephen Hemminger11dc1f32006-05-25 16:00:12 -0700200 br_netlink_fini();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 unregister_netdevice_notifier(&br_device_notifier);
202 brioctl_set(NULL);
203
Alexey Dobriyan712d6952008-09-08 16:20:18 -0700204 unregister_pernet_subsys(&br_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
Jesper Dangaard Brouer473c22d2009-06-26 10:45:48 +0000206 rcu_barrier(); /* Wait for completion of call_rcu()'s */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
Bodo Stroesserd69efb12008-04-29 03:18:13 -0700208 br_netfilter_fini();
Igor Maraviće6373c42011-12-12 02:58:25 +0000209#if IS_ENABLED(CONFIG_ATM_LANE)
Michał Mirosławda678292009-06-05 05:35:28 +0000210 br_fdb_test_addr_hook = NULL;
211#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 br_fdb_fini();
214}
215
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216module_init(br_init)
217module_exit(br_deinit)
218MODULE_LICENSE("GPL");
Stephen Hemminger8cbb512e2005-12-21 19:01:30 -0800219MODULE_VERSION(BR_VERSION);
stephen hemmingerbb900b22011-04-04 14:03:32 +0000220MODULE_ALIAS_RTNL_LINK("bridge");