Merge tag 'timers-core-2024-03-23' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-microblaze.git] / net / bridge / br.c
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  */
28 static 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, &notified);
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
145 static struct notifier_block br_device_notifier = {
146         .notifier_call = br_device_event
147 };
148
149 /* called with RTNL or RCU */
150 static 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
197 out:
198         return err;
199 }
200
201 static struct notifier_block br_switchdev_notifier = {
202         .notifier_call = br_switchdev_event,
203 };
204
205 /* called under rtnl_mutex */
206 static 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         case SWITCHDEV_BRPORT_REPLAY:
238                 brport_info = ptr;
239                 b = &brport_info->brport;
240
241                 err = br_switchdev_port_replay(p, b->dev, b->ctx, b->atomic_nb,
242                                                b->blocking_nb, extack);
243                 err = notifier_from_errno(err);
244                 break;
245         }
246
247 out:
248         return err;
249 }
250
251 static struct notifier_block br_switchdev_blocking_notifier = {
252         .notifier_call = br_switchdev_blocking_event,
253 };
254
255 /* br_boolopt_toggle - change user-controlled boolean option
256  *
257  * @br: bridge device
258  * @opt: id of the option to change
259  * @on: new option value
260  * @extack: extack for error messages
261  *
262  * Changes the value of the respective boolean option to @on taking care of
263  * any internal option value mapping and configuration.
264  */
265 int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on,
266                       struct netlink_ext_ack *extack)
267 {
268         int err = 0;
269
270         switch (opt) {
271         case BR_BOOLOPT_NO_LL_LEARN:
272                 br_opt_toggle(br, BROPT_NO_LL_LEARN, on);
273                 break;
274         case BR_BOOLOPT_MCAST_VLAN_SNOOPING:
275                 err = br_multicast_toggle_vlan_snooping(br, on, extack);
276                 break;
277         case BR_BOOLOPT_MST_ENABLE:
278                 err = br_mst_set_enabled(br, on, extack);
279                 break;
280         default:
281                 /* shouldn't be called with unsupported options */
282                 WARN_ON(1);
283                 break;
284         }
285
286         return err;
287 }
288
289 int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt)
290 {
291         switch (opt) {
292         case BR_BOOLOPT_NO_LL_LEARN:
293                 return br_opt_get(br, BROPT_NO_LL_LEARN);
294         case BR_BOOLOPT_MCAST_VLAN_SNOOPING:
295                 return br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED);
296         case BR_BOOLOPT_MST_ENABLE:
297                 return br_opt_get(br, BROPT_MST_ENABLED);
298         default:
299                 /* shouldn't be called with unsupported options */
300                 WARN_ON(1);
301                 break;
302         }
303
304         return 0;
305 }
306
307 int br_boolopt_multi_toggle(struct net_bridge *br,
308                             struct br_boolopt_multi *bm,
309                             struct netlink_ext_ack *extack)
310 {
311         unsigned long bitmap = bm->optmask;
312         int err = 0;
313         int opt_id;
314
315         for_each_set_bit(opt_id, &bitmap, BR_BOOLOPT_MAX) {
316                 bool on = !!(bm->optval & BIT(opt_id));
317
318                 err = br_boolopt_toggle(br, opt_id, on, extack);
319                 if (err) {
320                         br_debug(br, "boolopt multi-toggle error: option: %d current: %d new: %d error: %d\n",
321                                  opt_id, br_boolopt_get(br, opt_id), on, err);
322                         break;
323                 }
324         }
325
326         return err;
327 }
328
329 void br_boolopt_multi_get(const struct net_bridge *br,
330                           struct br_boolopt_multi *bm)
331 {
332         u32 optval = 0;
333         int opt_id;
334
335         for (opt_id = 0; opt_id < BR_BOOLOPT_MAX; opt_id++)
336                 optval |= (br_boolopt_get(br, opt_id) << opt_id);
337
338         bm->optval = optval;
339         bm->optmask = GENMASK((BR_BOOLOPT_MAX - 1), 0);
340 }
341
342 /* private bridge options, controlled by the kernel */
343 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on)
344 {
345         bool cur = !!br_opt_get(br, opt);
346
347         br_debug(br, "toggle option: %d state: %d -> %d\n",
348                  opt, cur, on);
349
350         if (cur == on)
351                 return;
352
353         if (on)
354                 set_bit(opt, &br->options);
355         else
356                 clear_bit(opt, &br->options);
357 }
358
359 static void __net_exit br_net_exit_batch_rtnl(struct list_head *net_list,
360                                               struct list_head *dev_to_kill)
361 {
362         struct net_device *dev;
363         struct net *net;
364
365         ASSERT_RTNL();
366         list_for_each_entry(net, net_list, exit_list)
367                 for_each_netdev(net, dev)
368                         if (netif_is_bridge_master(dev))
369                                 br_dev_delete(dev, dev_to_kill);
370 }
371
372 static struct pernet_operations br_net_ops = {
373         .exit_batch_rtnl = br_net_exit_batch_rtnl,
374 };
375
376 static const struct stp_proto br_stp_proto = {
377         .rcv    = br_stp_rcv,
378 };
379
380 static int __init br_init(void)
381 {
382         int err;
383
384         BUILD_BUG_ON(sizeof(struct br_input_skb_cb) > sizeof_field(struct sk_buff, cb));
385
386         err = stp_proto_register(&br_stp_proto);
387         if (err < 0) {
388                 pr_err("bridge: can't register sap for STP\n");
389                 return err;
390         }
391
392         err = br_fdb_init();
393         if (err)
394                 goto err_out;
395
396         err = register_pernet_subsys(&br_net_ops);
397         if (err)
398                 goto err_out1;
399
400         err = br_nf_core_init();
401         if (err)
402                 goto err_out2;
403
404         err = register_netdevice_notifier(&br_device_notifier);
405         if (err)
406                 goto err_out3;
407
408         err = register_switchdev_notifier(&br_switchdev_notifier);
409         if (err)
410                 goto err_out4;
411
412         err = register_switchdev_blocking_notifier(&br_switchdev_blocking_notifier);
413         if (err)
414                 goto err_out5;
415
416         err = br_netlink_init();
417         if (err)
418                 goto err_out6;
419
420         brioctl_set(br_ioctl_stub);
421
422 #if IS_ENABLED(CONFIG_ATM_LANE)
423         br_fdb_test_addr_hook = br_fdb_test_addr;
424 #endif
425
426 #if IS_MODULE(CONFIG_BRIDGE_NETFILTER)
427         pr_info("bridge: filtering via arp/ip/ip6tables is no longer available "
428                 "by default. Update your scripts to load br_netfilter if you "
429                 "need this.\n");
430 #endif
431
432         return 0;
433
434 err_out6:
435         unregister_switchdev_blocking_notifier(&br_switchdev_blocking_notifier);
436 err_out5:
437         unregister_switchdev_notifier(&br_switchdev_notifier);
438 err_out4:
439         unregister_netdevice_notifier(&br_device_notifier);
440 err_out3:
441         br_nf_core_fini();
442 err_out2:
443         unregister_pernet_subsys(&br_net_ops);
444 err_out1:
445         br_fdb_fini();
446 err_out:
447         stp_proto_unregister(&br_stp_proto);
448         return err;
449 }
450
451 static void __exit br_deinit(void)
452 {
453         stp_proto_unregister(&br_stp_proto);
454         br_netlink_fini();
455         unregister_switchdev_blocking_notifier(&br_switchdev_blocking_notifier);
456         unregister_switchdev_notifier(&br_switchdev_notifier);
457         unregister_netdevice_notifier(&br_device_notifier);
458         brioctl_set(NULL);
459         unregister_pernet_subsys(&br_net_ops);
460
461         rcu_barrier(); /* Wait for completion of call_rcu()'s */
462
463         br_nf_core_fini();
464 #if IS_ENABLED(CONFIG_ATM_LANE)
465         br_fdb_test_addr_hook = NULL;
466 #endif
467         br_fdb_fini();
468 }
469
470 module_init(br_init)
471 module_exit(br_deinit)
472 MODULE_LICENSE("GPL");
473 MODULE_VERSION(BR_VERSION);
474 MODULE_ALIAS_RTNL_LINK("bridge");
475 MODULE_DESCRIPTION("Ethernet bridge driver");