Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Generic parts
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/module.h>
15#include <linux/kernel.h>
16#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
18#include <linux/init.h>
19#include <linux/llc.h>
20#include <net/llc.h>
21#include <net/stp.h>
22#include <net/switchdev.h>
23
24#include "br_private.h"
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 = netdev_notifier_info_to_dev(ptr);
35 struct net_bridge_port *p;
36 struct net_bridge *br;
37 bool notified = false;
38 bool changed_addr;
39 int err;
40
41 /* register of bridge completed, add sysfs entries */
42 if ((dev->priv_flags & IFF_EBRIDGE) && event == NETDEV_REGISTER) {
43 br_sysfs_addbr(dev);
44 return NOTIFY_DONE;
45 }
46
47 /* not a port of a bridge */
48 p = br_port_get_rtnl(dev);
49 if (!p)
50 return NOTIFY_DONE;
51
52 br = p->br;
53
54 switch (event) {
55 case NETDEV_CHANGEMTU:
56 br_mtu_auto_adjust(br);
57 break;
58
59 case NETDEV_CHANGEADDR:
60 spin_lock_bh(&br->lock);
61 br_fdb_changeaddr(p, dev->dev_addr);
62 changed_addr = br_stp_recalculate_bridge_id(br);
63 spin_unlock_bh(&br->lock);
64
65 if (changed_addr)
66 call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
67
68 break;
69
70 case NETDEV_CHANGE:
71 br_port_carrier_check(p, ¬ified);
72 break;
73
74 case NETDEV_FEAT_CHANGE:
75 netdev_update_features(br->dev);
76 break;
77
78 case NETDEV_DOWN:
79 spin_lock_bh(&br->lock);
80 if (br->dev->flags & IFF_UP) {
81 br_stp_disable_port(p);
82 notified = true;
83 }
84 spin_unlock_bh(&br->lock);
85 break;
86
87 case NETDEV_UP:
88 if (netif_running(br->dev) && netif_oper_up(dev)) {
89 spin_lock_bh(&br->lock);
90 br_stp_enable_port(p);
91 notified = true;
92 spin_unlock_bh(&br->lock);
93 }
94 break;
95
96 case NETDEV_UNREGISTER:
97 br_del_if(br, dev);
98 break;
99
100 case NETDEV_CHANGENAME:
101 err = br_sysfs_renameif(p);
102 if (err)
103 return notifier_from_errno(err);
104 break;
105
106 case NETDEV_PRE_TYPE_CHANGE:
107 /* Forbid underlaying device to change its type. */
108 return NOTIFY_BAD;
109
110 case NETDEV_RESEND_IGMP:
111 /* Propagate to master device */
112 call_netdevice_notifiers(event, br->dev);
113 break;
114 }
115
116 /* Events that may cause spanning tree to refresh */
117 if (!notified && (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
118 event == NETDEV_CHANGE || event == NETDEV_DOWN))
119 br_ifinfo_notify(RTM_NEWLINK, NULL, p);
120
121 return NOTIFY_DONE;
122}
123
124static struct notifier_block br_device_notifier = {
125 .notifier_call = br_device_event
126};
127
128/* called with RTNL or RCU */
129static int br_switchdev_event(struct notifier_block *unused,
130 unsigned long event, void *ptr)
131{
132 struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
133 struct net_bridge_port *p;
134 struct net_bridge *br;
135 struct switchdev_notifier_fdb_info *fdb_info;
136 int err = NOTIFY_DONE;
137
138 p = br_port_get_rtnl_rcu(dev);
139 if (!p)
140 goto out;
141
142 br = p->br;
143
144 switch (event) {
145 case SWITCHDEV_FDB_ADD_TO_BRIDGE:
146 fdb_info = ptr;
147 err = br_fdb_external_learn_add(br, p, fdb_info->addr,
148 fdb_info->vid, false);
149 if (err) {
150 err = notifier_from_errno(err);
151 break;
152 }
153 br_fdb_offloaded_set(br, p, fdb_info->addr,
154 fdb_info->vid, true);
155 break;
156 case SWITCHDEV_FDB_DEL_TO_BRIDGE:
157 fdb_info = ptr;
158 err = br_fdb_external_learn_del(br, p, fdb_info->addr,
159 fdb_info->vid, false);
160 if (err)
161 err = notifier_from_errno(err);
162 break;
163 case SWITCHDEV_FDB_OFFLOADED:
164 fdb_info = ptr;
165 br_fdb_offloaded_set(br, p, fdb_info->addr,
166 fdb_info->vid, fdb_info->offloaded);
167 break;
168 }
169
170out:
171 return err;
172}
173
174static struct notifier_block br_switchdev_notifier = {
175 .notifier_call = br_switchdev_event,
176};
177
178void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on)
179{
180 bool cur = !!br_opt_get(br, opt);
181
182 br_debug(br, "toggle option: %d state: %d -> %d\n",
183 opt, cur, on);
184
185 if (cur == on)
186 return;
187
188 if (on)
189 set_bit(opt, &br->options);
190 else
191 clear_bit(opt, &br->options);
192}
193
194static void __net_exit br_net_exit(struct net *net)
195{
196 struct net_device *dev;
197 LIST_HEAD(list);
198
199 rtnl_lock();
200 for_each_netdev(net, dev)
201 if (dev->priv_flags & IFF_EBRIDGE)
202 br_dev_delete(dev, &list);
203
204 unregister_netdevice_many(&list);
205 rtnl_unlock();
206
207}
208
209static struct pernet_operations br_net_ops = {
210 .exit = br_net_exit,
211};
212
213static const struct stp_proto br_stp_proto = {
214 .rcv = br_stp_rcv,
215};
216
217static int __init br_init(void)
218{
219 int err;
220
221 BUILD_BUG_ON(sizeof(struct br_input_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
222
223 err = stp_proto_register(&br_stp_proto);
224 if (err < 0) {
225 pr_err("bridge: can't register sap for STP\n");
226 return err;
227 }
228
229 err = br_fdb_init();
230 if (err)
231 goto err_out;
232
233 err = register_pernet_subsys(&br_net_ops);
234 if (err)
235 goto err_out1;
236
237 err = br_nf_core_init();
238 if (err)
239 goto err_out2;
240
241 err = register_netdevice_notifier(&br_device_notifier);
242 if (err)
243 goto err_out3;
244
245 err = register_switchdev_notifier(&br_switchdev_notifier);
246 if (err)
247 goto err_out4;
248
249 err = br_netlink_init();
250 if (err)
251 goto err_out5;
252
253 brioctl_set(br_ioctl_deviceless_stub);
254
255#if IS_ENABLED(CONFIG_ATM_LANE)
256 br_fdb_test_addr_hook = br_fdb_test_addr;
257#endif
258
259#if IS_MODULE(CONFIG_BRIDGE_NETFILTER)
260 pr_info("bridge: filtering via arp/ip/ip6tables is no longer available "
261 "by default. Update your scripts to load br_netfilter if you "
262 "need this.\n");
263#endif
264
265 return 0;
266
267err_out5:
268 unregister_switchdev_notifier(&br_switchdev_notifier);
269err_out4:
270 unregister_netdevice_notifier(&br_device_notifier);
271err_out3:
272 br_nf_core_fini();
273err_out2:
274 unregister_pernet_subsys(&br_net_ops);
275err_out1:
276 br_fdb_fini();
277err_out:
278 stp_proto_unregister(&br_stp_proto);
279 return err;
280}
281
282static void __exit br_deinit(void)
283{
284 stp_proto_unregister(&br_stp_proto);
285 br_netlink_fini();
286 unregister_switchdev_notifier(&br_switchdev_notifier);
287 unregister_netdevice_notifier(&br_device_notifier);
288 brioctl_set(NULL);
289 unregister_pernet_subsys(&br_net_ops);
290
291 rcu_barrier(); /* Wait for completion of call_rcu()'s */
292
293 br_nf_core_fini();
294#if IS_ENABLED(CONFIG_ATM_LANE)
295 br_fdb_test_addr_hook = NULL;
296#endif
297 br_fdb_fini();
298}
299
300module_init(br_init)
301module_exit(br_deinit)
302MODULE_LICENSE("GPL");
303MODULE_VERSION(BR_VERSION);
304MODULE_ALIAS_RTNL_LINK("bridge");