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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 changed_addr;
38 int err;
39
40 /* register of bridge completed, add sysfs entries */
41 if ((dev->priv_flags & IFF_EBRIDGE) && event == NETDEV_REGISTER) {
42 br_sysfs_addbr(dev);
43 return NOTIFY_DONE;
44 }
45
46 /* not a port of a bridge */
47 p = br_port_get_rtnl(dev);
48 if (!p)
49 return NOTIFY_DONE;
50
51 br = p->br;
52
53 switch (event) {
54 case NETDEV_CHANGEMTU:
55 dev_set_mtu(br->dev, br_min_mtu(br));
56 break;
57
58 case NETDEV_CHANGEADDR:
59 spin_lock_bh(&br->lock);
60 br_fdb_changeaddr(p, dev->dev_addr);
61 changed_addr = br_stp_recalculate_bridge_id(br);
62 spin_unlock_bh(&br->lock);
63
64 if (changed_addr)
65 call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
66
67 break;
68
69 case NETDEV_CHANGE:
70 br_port_carrier_check(p);
71 break;
72
73 case NETDEV_FEAT_CHANGE:
74 netdev_update_features(br->dev);
75 break;
76
77 case NETDEV_DOWN:
78 spin_lock_bh(&br->lock);
79 if (br->dev->flags & IFF_UP)
80 br_stp_disable_port(p);
81 spin_unlock_bh(&br->lock);
82 break;
83
84 case NETDEV_UP:
85 if (netif_running(br->dev) && netif_oper_up(dev)) {
86 spin_lock_bh(&br->lock);
87 br_stp_enable_port(p);
88 spin_unlock_bh(&br->lock);
89 }
90 break;
91
92 case NETDEV_UNREGISTER:
93 br_del_if(br, dev);
94 break;
95
96 case NETDEV_CHANGENAME:
97 err = br_sysfs_renameif(p);
98 if (err)
99 return notifier_from_errno(err);
100 break;
101
102 case NETDEV_PRE_TYPE_CHANGE:
103 /* Forbid underlaying device to change its type. */
104 return NOTIFY_BAD;
105
106 case NETDEV_RESEND_IGMP:
107 /* Propagate to master device */
108 call_netdevice_notifiers(event, br->dev);
109 break;
110 }
111
112 /* Events that may cause spanning tree to refresh */
113 if (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
114 event == NETDEV_CHANGE || event == NETDEV_DOWN)
115 br_ifinfo_notify(RTM_NEWLINK, p);
116
117 return NOTIFY_DONE;
118}
119
120static struct notifier_block br_device_notifier = {
121 .notifier_call = br_device_event
122};
123
124/* called with RTNL */
125static int br_switchdev_event(struct notifier_block *unused,
126 unsigned long event, void *ptr)
127{
128 struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
129 struct net_bridge_port *p;
130 struct net_bridge *br;
131 struct switchdev_notifier_fdb_info *fdb_info;
132 int err = NOTIFY_DONE;
133
134 p = br_port_get_rtnl(dev);
135 if (!p)
136 goto out;
137
138 br = p->br;
139
140 switch (event) {
141 case SWITCHDEV_FDB_ADD:
142 fdb_info = ptr;
143 err = br_fdb_external_learn_add(br, p, fdb_info->addr,
144 fdb_info->vid);
145 if (err)
146 err = notifier_from_errno(err);
147 break;
148 case SWITCHDEV_FDB_DEL:
149 fdb_info = ptr;
150 err = br_fdb_external_learn_del(br, p, fdb_info->addr,
151 fdb_info->vid);
152 if (err)
153 err = notifier_from_errno(err);
154 break;
155 }
156
157out:
158 return err;
159}
160
161static struct notifier_block br_switchdev_notifier = {
162 .notifier_call = br_switchdev_event,
163};
164
165static void __net_exit br_net_exit(struct net *net)
166{
167 struct net_device *dev;
168 LIST_HEAD(list);
169
170 rtnl_lock();
171 for_each_netdev(net, dev)
172 if (dev->priv_flags & IFF_EBRIDGE)
173 br_dev_delete(dev, &list);
174
175 unregister_netdevice_many(&list);
176 rtnl_unlock();
177
178}
179
180static struct pernet_operations br_net_ops = {
181 .exit = br_net_exit,
182};
183
184static const struct stp_proto br_stp_proto = {
185 .rcv = br_stp_rcv,
186};
187
188static int __init br_init(void)
189{
190 int err;
191
192 BUILD_BUG_ON(sizeof(struct br_input_skb_cb) > FIELD_SIZEOF(struct sk_buff, cb));
193
194 err = stp_proto_register(&br_stp_proto);
195 if (err < 0) {
196 pr_err("bridge: can't register sap for STP\n");
197 return err;
198 }
199
200 err = br_fdb_init();
201 if (err)
202 goto err_out;
203
204 err = register_pernet_subsys(&br_net_ops);
205 if (err)
206 goto err_out1;
207
208 err = br_nf_core_init();
209 if (err)
210 goto err_out2;
211
212 err = register_netdevice_notifier(&br_device_notifier);
213 if (err)
214 goto err_out3;
215
216 err = register_switchdev_notifier(&br_switchdev_notifier);
217 if (err)
218 goto err_out4;
219
220 err = br_netlink_init();
221 if (err)
222 goto err_out5;
223
224 brioctl_set(br_ioctl_deviceless_stub);
225
226#if IS_ENABLED(CONFIG_ATM_LANE)
227 br_fdb_test_addr_hook = br_fdb_test_addr;
228#endif
229
230 pr_info("bridge: automatic filtering via arp/ip/ip6tables has been "
231 "deprecated. Update your scripts to load br_netfilter if you "
232 "need this.\n");
233
234 return 0;
235
236err_out5:
237 unregister_switchdev_notifier(&br_switchdev_notifier);
238err_out4:
239 unregister_netdevice_notifier(&br_device_notifier);
240err_out3:
241 br_nf_core_fini();
242err_out2:
243 unregister_pernet_subsys(&br_net_ops);
244err_out1:
245 br_fdb_fini();
246err_out:
247 stp_proto_unregister(&br_stp_proto);
248 return err;
249}
250
251static void __exit br_deinit(void)
252{
253 stp_proto_unregister(&br_stp_proto);
254 br_netlink_fini();
255 unregister_switchdev_notifier(&br_switchdev_notifier);
256 unregister_netdevice_notifier(&br_device_notifier);
257 brioctl_set(NULL);
258 unregister_pernet_subsys(&br_net_ops);
259
260 rcu_barrier(); /* Wait for completion of call_rcu()'s */
261
262 br_nf_core_fini();
263#if IS_ENABLED(CONFIG_ATM_LANE)
264 br_fdb_test_addr_hook = NULL;
265#endif
266 br_fdb_fini();
267}
268
269module_init(br_init)
270module_exit(br_deinit)
271MODULE_LICENSE("GPL");
272MODULE_VERSION(BR_VERSION);
273MODULE_ALIAS_RTNL_LINK("bridge");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Generic parts
4 * Linux ethernet bridge
5 *
6 * Authors:
7 * Lennert Buytenhek <buytenh@gnu.org>
8 */
9
10#include <linux/module.h>
11#include <linux/kernel.h>
12#include <linux/netdevice.h>
13#include <linux/etherdevice.h>
14#include <linux/init.h>
15#include <linux/llc.h>
16#include <net/llc.h>
17#include <net/stp.h>
18#include <net/switchdev.h>
19
20#include "br_private.h"
21
22/*
23 * Handle changes in state of network devices enslaved to a bridge.
24 *
25 * Note: don't care about up/down if bridge itself is down, because
26 * port state is checked when bridge is brought up.
27 */
28static int br_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
29{
30 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
31 struct netdev_notifier_pre_changeaddr_info *prechaddr_info;
32 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
33 struct net_bridge_port *p;
34 struct net_bridge *br;
35 bool notified = false;
36 bool changed_addr;
37 int err;
38
39 if (netif_is_bridge_master(dev)) {
40 err = br_vlan_bridge_event(dev, event, ptr);
41 if (err)
42 return notifier_from_errno(err);
43
44 if (event == NETDEV_REGISTER) {
45 /* register of bridge completed, add sysfs entries */
46 err = br_sysfs_addbr(dev);
47 if (err)
48 return notifier_from_errno(err);
49
50 return NOTIFY_DONE;
51 }
52 }
53
54 /* not a port of a bridge */
55 p = br_port_get_rtnl(dev);
56 if (!p)
57 return NOTIFY_DONE;
58
59 br = p->br;
60
61 switch (event) {
62 case NETDEV_CHANGEMTU:
63 br_mtu_auto_adjust(br);
64 break;
65
66 case NETDEV_PRE_CHANGEADDR:
67 if (br->dev->addr_assign_type == NET_ADDR_SET)
68 break;
69 prechaddr_info = ptr;
70 err = dev_pre_changeaddr_notify(br->dev,
71 prechaddr_info->dev_addr,
72 extack);
73 if (err)
74 return notifier_from_errno(err);
75 break;
76
77 case NETDEV_CHANGEADDR:
78 spin_lock_bh(&br->lock);
79 br_fdb_changeaddr(p, dev->dev_addr);
80 changed_addr = br_stp_recalculate_bridge_id(br);
81 spin_unlock_bh(&br->lock);
82
83 if (changed_addr)
84 call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
85
86 break;
87
88 case NETDEV_CHANGE:
89 br_port_carrier_check(p, ¬ified);
90 break;
91
92 case NETDEV_FEAT_CHANGE:
93 netdev_update_features(br->dev);
94 break;
95
96 case NETDEV_DOWN:
97 spin_lock_bh(&br->lock);
98 if (br->dev->flags & IFF_UP) {
99 br_stp_disable_port(p);
100 notified = true;
101 }
102 spin_unlock_bh(&br->lock);
103 break;
104
105 case NETDEV_UP:
106 if (netif_running(br->dev) && netif_oper_up(dev)) {
107 spin_lock_bh(&br->lock);
108 br_stp_enable_port(p);
109 notified = true;
110 spin_unlock_bh(&br->lock);
111 }
112 break;
113
114 case NETDEV_UNREGISTER:
115 br_del_if(br, dev);
116 break;
117
118 case NETDEV_CHANGENAME:
119 err = br_sysfs_renameif(p);
120 if (err)
121 return notifier_from_errno(err);
122 break;
123
124 case NETDEV_PRE_TYPE_CHANGE:
125 /* Forbid underlying device to change its type. */
126 return NOTIFY_BAD;
127
128 case NETDEV_RESEND_IGMP:
129 /* Propagate to master device */
130 call_netdevice_notifiers(event, br->dev);
131 break;
132 }
133
134 if (event != NETDEV_UNREGISTER)
135 br_vlan_port_event(p, event);
136
137 /* Events that may cause spanning tree to refresh */
138 if (!notified && (event == NETDEV_CHANGEADDR || event == NETDEV_UP ||
139 event == NETDEV_CHANGE || event == NETDEV_DOWN))
140 br_ifinfo_notify(RTM_NEWLINK, NULL, p);
141
142 return NOTIFY_DONE;
143}
144
145static struct notifier_block br_device_notifier = {
146 .notifier_call = br_device_event
147};
148
149/* called with RTNL or RCU */
150static int br_switchdev_event(struct notifier_block *unused,
151 unsigned long event, void *ptr)
152{
153 struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
154 struct net_bridge_port *p;
155 struct net_bridge *br;
156 struct switchdev_notifier_fdb_info *fdb_info;
157 int err = NOTIFY_DONE;
158
159 p = br_port_get_rtnl_rcu(dev);
160 if (!p)
161 goto out;
162
163 br = p->br;
164
165 switch (event) {
166 case SWITCHDEV_FDB_ADD_TO_BRIDGE:
167 fdb_info = ptr;
168 err = br_fdb_external_learn_add(br, p, fdb_info->addr,
169 fdb_info->vid,
170 fdb_info->locked, false);
171 if (err) {
172 err = notifier_from_errno(err);
173 break;
174 }
175 br_fdb_offloaded_set(br, p, fdb_info->addr,
176 fdb_info->vid, fdb_info->offloaded);
177 break;
178 case SWITCHDEV_FDB_DEL_TO_BRIDGE:
179 fdb_info = ptr;
180 err = br_fdb_external_learn_del(br, p, fdb_info->addr,
181 fdb_info->vid, false);
182 if (err)
183 err = notifier_from_errno(err);
184 break;
185 case SWITCHDEV_FDB_OFFLOADED:
186 fdb_info = ptr;
187 br_fdb_offloaded_set(br, p, fdb_info->addr,
188 fdb_info->vid, fdb_info->offloaded);
189 break;
190 case SWITCHDEV_FDB_FLUSH_TO_BRIDGE:
191 fdb_info = ptr;
192 /* Don't delete static entries */
193 br_fdb_delete_by_port(br, p, fdb_info->vid, 0);
194 break;
195 }
196
197out:
198 return err;
199}
200
201static struct notifier_block br_switchdev_notifier = {
202 .notifier_call = br_switchdev_event,
203};
204
205/* called under rtnl_mutex */
206static int br_switchdev_blocking_event(struct notifier_block *nb,
207 unsigned long event, void *ptr)
208{
209 struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
210 struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
211 struct switchdev_notifier_brport_info *brport_info;
212 const struct switchdev_brport *b;
213 struct net_bridge_port *p;
214 int err = NOTIFY_DONE;
215
216 p = br_port_get_rtnl(dev);
217 if (!p)
218 goto out;
219
220 switch (event) {
221 case SWITCHDEV_BRPORT_OFFLOADED:
222 brport_info = ptr;
223 b = &brport_info->brport;
224
225 err = br_switchdev_port_offload(p, b->dev, b->ctx,
226 b->atomic_nb, b->blocking_nb,
227 b->tx_fwd_offload, extack);
228 err = notifier_from_errno(err);
229 break;
230 case SWITCHDEV_BRPORT_UNOFFLOADED:
231 brport_info = ptr;
232 b = &brport_info->brport;
233
234 br_switchdev_port_unoffload(p, b->ctx, b->atomic_nb,
235 b->blocking_nb);
236 break;
237 }
238
239out:
240 return err;
241}
242
243static struct notifier_block br_switchdev_blocking_notifier = {
244 .notifier_call = br_switchdev_blocking_event,
245};
246
247/* br_boolopt_toggle - change user-controlled boolean option
248 *
249 * @br: bridge device
250 * @opt: id of the option to change
251 * @on: new option value
252 * @extack: extack for error messages
253 *
254 * Changes the value of the respective boolean option to @on taking care of
255 * any internal option value mapping and configuration.
256 */
257int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on,
258 struct netlink_ext_ack *extack)
259{
260 int err = 0;
261
262 switch (opt) {
263 case BR_BOOLOPT_NO_LL_LEARN:
264 br_opt_toggle(br, BROPT_NO_LL_LEARN, on);
265 break;
266 case BR_BOOLOPT_MCAST_VLAN_SNOOPING:
267 err = br_multicast_toggle_vlan_snooping(br, on, extack);
268 break;
269 case BR_BOOLOPT_MST_ENABLE:
270 err = br_mst_set_enabled(br, on, extack);
271 break;
272 default:
273 /* shouldn't be called with unsupported options */
274 WARN_ON(1);
275 break;
276 }
277
278 return err;
279}
280
281int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt)
282{
283 switch (opt) {
284 case BR_BOOLOPT_NO_LL_LEARN:
285 return br_opt_get(br, BROPT_NO_LL_LEARN);
286 case BR_BOOLOPT_MCAST_VLAN_SNOOPING:
287 return br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED);
288 case BR_BOOLOPT_MST_ENABLE:
289 return br_opt_get(br, BROPT_MST_ENABLED);
290 default:
291 /* shouldn't be called with unsupported options */
292 WARN_ON(1);
293 break;
294 }
295
296 return 0;
297}
298
299int br_boolopt_multi_toggle(struct net_bridge *br,
300 struct br_boolopt_multi *bm,
301 struct netlink_ext_ack *extack)
302{
303 unsigned long bitmap = bm->optmask;
304 int err = 0;
305 int opt_id;
306
307 for_each_set_bit(opt_id, &bitmap, BR_BOOLOPT_MAX) {
308 bool on = !!(bm->optval & BIT(opt_id));
309
310 err = br_boolopt_toggle(br, opt_id, on, extack);
311 if (err) {
312 br_debug(br, "boolopt multi-toggle error: option: %d current: %d new: %d error: %d\n",
313 opt_id, br_boolopt_get(br, opt_id), on, err);
314 break;
315 }
316 }
317
318 return err;
319}
320
321void br_boolopt_multi_get(const struct net_bridge *br,
322 struct br_boolopt_multi *bm)
323{
324 u32 optval = 0;
325 int opt_id;
326
327 for (opt_id = 0; opt_id < BR_BOOLOPT_MAX; opt_id++)
328 optval |= (br_boolopt_get(br, opt_id) << opt_id);
329
330 bm->optval = optval;
331 bm->optmask = GENMASK((BR_BOOLOPT_MAX - 1), 0);
332}
333
334/* private bridge options, controlled by the kernel */
335void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on)
336{
337 bool cur = !!br_opt_get(br, opt);
338
339 br_debug(br, "toggle option: %d state: %d -> %d\n",
340 opt, cur, on);
341
342 if (cur == on)
343 return;
344
345 if (on)
346 set_bit(opt, &br->options);
347 else
348 clear_bit(opt, &br->options);
349}
350
351static void __net_exit br_net_exit_batch(struct list_head *net_list)
352{
353 struct net_device *dev;
354 struct net *net;
355 LIST_HEAD(list);
356
357 rtnl_lock();
358
359 list_for_each_entry(net, net_list, exit_list)
360 for_each_netdev(net, dev)
361 if (netif_is_bridge_master(dev))
362 br_dev_delete(dev, &list);
363
364 unregister_netdevice_many(&list);
365
366 rtnl_unlock();
367}
368
369static struct pernet_operations br_net_ops = {
370 .exit_batch = br_net_exit_batch,
371};
372
373static const struct stp_proto br_stp_proto = {
374 .rcv = br_stp_rcv,
375};
376
377static int __init br_init(void)
378{
379 int err;
380
381 BUILD_BUG_ON(sizeof(struct br_input_skb_cb) > sizeof_field(struct sk_buff, cb));
382
383 err = stp_proto_register(&br_stp_proto);
384 if (err < 0) {
385 pr_err("bridge: can't register sap for STP\n");
386 return err;
387 }
388
389 err = br_fdb_init();
390 if (err)
391 goto err_out;
392
393 err = register_pernet_subsys(&br_net_ops);
394 if (err)
395 goto err_out1;
396
397 err = br_nf_core_init();
398 if (err)
399 goto err_out2;
400
401 err = register_netdevice_notifier(&br_device_notifier);
402 if (err)
403 goto err_out3;
404
405 err = register_switchdev_notifier(&br_switchdev_notifier);
406 if (err)
407 goto err_out4;
408
409 err = register_switchdev_blocking_notifier(&br_switchdev_blocking_notifier);
410 if (err)
411 goto err_out5;
412
413 err = br_netlink_init();
414 if (err)
415 goto err_out6;
416
417 brioctl_set(br_ioctl_stub);
418
419#if IS_ENABLED(CONFIG_ATM_LANE)
420 br_fdb_test_addr_hook = br_fdb_test_addr;
421#endif
422
423#if IS_MODULE(CONFIG_BRIDGE_NETFILTER)
424 pr_info("bridge: filtering via arp/ip/ip6tables is no longer available "
425 "by default. Update your scripts to load br_netfilter if you "
426 "need this.\n");
427#endif
428
429 return 0;
430
431err_out6:
432 unregister_switchdev_blocking_notifier(&br_switchdev_blocking_notifier);
433err_out5:
434 unregister_switchdev_notifier(&br_switchdev_notifier);
435err_out4:
436 unregister_netdevice_notifier(&br_device_notifier);
437err_out3:
438 br_nf_core_fini();
439err_out2:
440 unregister_pernet_subsys(&br_net_ops);
441err_out1:
442 br_fdb_fini();
443err_out:
444 stp_proto_unregister(&br_stp_proto);
445 return err;
446}
447
448static void __exit br_deinit(void)
449{
450 stp_proto_unregister(&br_stp_proto);
451 br_netlink_fini();
452 unregister_switchdev_blocking_notifier(&br_switchdev_blocking_notifier);
453 unregister_switchdev_notifier(&br_switchdev_notifier);
454 unregister_netdevice_notifier(&br_device_notifier);
455 brioctl_set(NULL);
456 unregister_pernet_subsys(&br_net_ops);
457
458 rcu_barrier(); /* Wait for completion of call_rcu()'s */
459
460 br_nf_core_fini();
461#if IS_ENABLED(CONFIG_ATM_LANE)
462 br_fdb_test_addr_hook = NULL;
463#endif
464 br_fdb_fini();
465}
466
467module_init(br_init)
468module_exit(br_deinit)
469MODULE_LICENSE("GPL");
470MODULE_VERSION(BR_VERSION);
471MODULE_ALIAS_RTNL_LINK("bridge");