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1/*
2 * Userspace interface
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/netdevice.h>
16#include <linux/netpoll.h>
17#include <linux/ethtool.h>
18#include <linux/if_arp.h>
19#include <linux/module.h>
20#include <linux/init.h>
21#include <linux/rtnetlink.h>
22#include <linux/if_ether.h>
23#include <linux/slab.h>
24#include <net/sock.h>
25
26#include "br_private.h"
27
28/*
29 * Determine initial path cost based on speed.
30 * using recommendations from 802.1d standard
31 *
32 * Since driver might sleep need to not be holding any locks.
33 */
34static int port_cost(struct net_device *dev)
35{
36 if (dev->ethtool_ops && dev->ethtool_ops->get_settings) {
37 struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET, };
38
39 if (!dev_ethtool_get_settings(dev, &ecmd)) {
40 switch (ethtool_cmd_speed(&ecmd)) {
41 case SPEED_10000:
42 return 2;
43 case SPEED_1000:
44 return 4;
45 case SPEED_100:
46 return 19;
47 case SPEED_10:
48 return 100;
49 }
50 }
51 }
52
53 /* Old silly heuristics based on name */
54 if (!strncmp(dev->name, "lec", 3))
55 return 7;
56
57 if (!strncmp(dev->name, "plip", 4))
58 return 2500;
59
60 return 100; /* assume old 10Mbps */
61}
62
63
64/* Check for port carrier transistions. */
65void br_port_carrier_check(struct net_bridge_port *p)
66{
67 struct net_device *dev = p->dev;
68 struct net_bridge *br = p->br;
69
70 if (netif_running(dev) && netif_carrier_ok(dev))
71 p->path_cost = port_cost(dev);
72
73 if (!netif_running(br->dev))
74 return;
75
76 spin_lock_bh(&br->lock);
77 if (netif_running(dev) && netif_carrier_ok(dev)) {
78 if (p->state == BR_STATE_DISABLED)
79 br_stp_enable_port(p);
80 } else {
81 if (p->state != BR_STATE_DISABLED)
82 br_stp_disable_port(p);
83 }
84 spin_unlock_bh(&br->lock);
85}
86
87static void release_nbp(struct kobject *kobj)
88{
89 struct net_bridge_port *p
90 = container_of(kobj, struct net_bridge_port, kobj);
91 kfree(p);
92}
93
94static struct kobj_type brport_ktype = {
95#ifdef CONFIG_SYSFS
96 .sysfs_ops = &brport_sysfs_ops,
97#endif
98 .release = release_nbp,
99};
100
101static void destroy_nbp(struct net_bridge_port *p)
102{
103 struct net_device *dev = p->dev;
104
105 p->br = NULL;
106 p->dev = NULL;
107 dev_put(dev);
108
109 kobject_put(&p->kobj);
110}
111
112static void destroy_nbp_rcu(struct rcu_head *head)
113{
114 struct net_bridge_port *p =
115 container_of(head, struct net_bridge_port, rcu);
116 destroy_nbp(p);
117}
118
119/* Delete port(interface) from bridge is done in two steps.
120 * via RCU. First step, marks device as down. That deletes
121 * all the timers and stops new packets from flowing through.
122 *
123 * Final cleanup doesn't occur until after all CPU's finished
124 * processing packets.
125 *
126 * Protected from multiple admin operations by RTNL mutex
127 */
128static void del_nbp(struct net_bridge_port *p)
129{
130 struct net_bridge *br = p->br;
131 struct net_device *dev = p->dev;
132
133 sysfs_remove_link(br->ifobj, p->dev->name);
134
135 dev_set_promiscuity(dev, -1);
136
137 spin_lock_bh(&br->lock);
138 br_stp_disable_port(p);
139 spin_unlock_bh(&br->lock);
140
141 br_ifinfo_notify(RTM_DELLINK, p);
142
143 br_fdb_delete_by_port(br, p, 1);
144
145 list_del_rcu(&p->list);
146
147 dev->priv_flags &= ~IFF_BRIDGE_PORT;
148
149 netdev_rx_handler_unregister(dev);
150 synchronize_net();
151
152 netdev_set_master(dev, NULL);
153
154 br_multicast_del_port(p);
155
156 kobject_uevent(&p->kobj, KOBJ_REMOVE);
157 kobject_del(&p->kobj);
158
159 br_netpoll_disable(p);
160
161 call_rcu(&p->rcu, destroy_nbp_rcu);
162}
163
164/* Delete bridge device */
165void br_dev_delete(struct net_device *dev, struct list_head *head)
166{
167 struct net_bridge *br = netdev_priv(dev);
168 struct net_bridge_port *p, *n;
169
170 list_for_each_entry_safe(p, n, &br->port_list, list) {
171 del_nbp(p);
172 }
173
174 del_timer_sync(&br->gc_timer);
175
176 br_sysfs_delbr(br->dev);
177 unregister_netdevice_queue(br->dev, head);
178}
179
180/* find an available port number */
181static int find_portno(struct net_bridge *br)
182{
183 int index;
184 struct net_bridge_port *p;
185 unsigned long *inuse;
186
187 inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
188 GFP_KERNEL);
189 if (!inuse)
190 return -ENOMEM;
191
192 set_bit(0, inuse); /* zero is reserved */
193 list_for_each_entry(p, &br->port_list, list) {
194 set_bit(p->port_no, inuse);
195 }
196 index = find_first_zero_bit(inuse, BR_MAX_PORTS);
197 kfree(inuse);
198
199 return (index >= BR_MAX_PORTS) ? -EXFULL : index;
200}
201
202/* called with RTNL but without bridge lock */
203static struct net_bridge_port *new_nbp(struct net_bridge *br,
204 struct net_device *dev)
205{
206 int index;
207 struct net_bridge_port *p;
208
209 index = find_portno(br);
210 if (index < 0)
211 return ERR_PTR(index);
212
213 p = kzalloc(sizeof(*p), GFP_KERNEL);
214 if (p == NULL)
215 return ERR_PTR(-ENOMEM);
216
217 p->br = br;
218 dev_hold(dev);
219 p->dev = dev;
220 p->path_cost = port_cost(dev);
221 p->priority = 0x8000 >> BR_PORT_BITS;
222 p->port_no = index;
223 p->flags = 0;
224 br_init_port(p);
225 p->state = BR_STATE_DISABLED;
226 br_stp_port_timer_init(p);
227 br_multicast_add_port(p);
228
229 return p;
230}
231
232int br_add_bridge(struct net *net, const char *name)
233{
234 struct net_device *dev;
235 int res;
236
237 dev = alloc_netdev(sizeof(struct net_bridge), name,
238 br_dev_setup);
239
240 if (!dev)
241 return -ENOMEM;
242
243 dev_net_set(dev, net);
244
245 res = register_netdev(dev);
246 if (res)
247 free_netdev(dev);
248 return res;
249}
250
251int br_del_bridge(struct net *net, const char *name)
252{
253 struct net_device *dev;
254 int ret = 0;
255
256 rtnl_lock();
257 dev = __dev_get_by_name(net, name);
258 if (dev == NULL)
259 ret = -ENXIO; /* Could not find device */
260
261 else if (!(dev->priv_flags & IFF_EBRIDGE)) {
262 /* Attempt to delete non bridge device! */
263 ret = -EPERM;
264 }
265
266 else if (dev->flags & IFF_UP) {
267 /* Not shutdown yet. */
268 ret = -EBUSY;
269 }
270
271 else
272 br_dev_delete(dev, NULL);
273
274 rtnl_unlock();
275 return ret;
276}
277
278/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
279int br_min_mtu(const struct net_bridge *br)
280{
281 const struct net_bridge_port *p;
282 int mtu = 0;
283
284 ASSERT_RTNL();
285
286 if (list_empty(&br->port_list))
287 mtu = ETH_DATA_LEN;
288 else {
289 list_for_each_entry(p, &br->port_list, list) {
290 if (!mtu || p->dev->mtu < mtu)
291 mtu = p->dev->mtu;
292 }
293 }
294 return mtu;
295}
296
297/*
298 * Recomputes features using slave's features
299 */
300u32 br_features_recompute(struct net_bridge *br, u32 features)
301{
302 struct net_bridge_port *p;
303 u32 mask;
304
305 if (list_empty(&br->port_list))
306 return features;
307
308 mask = features;
309 features &= ~NETIF_F_ONE_FOR_ALL;
310
311 list_for_each_entry(p, &br->port_list, list) {
312 features = netdev_increment_features(features,
313 p->dev->features, mask);
314 }
315
316 return features;
317}
318
319/* called with RTNL */
320int br_add_if(struct net_bridge *br, struct net_device *dev)
321{
322 struct net_bridge_port *p;
323 int err = 0;
324 bool changed_addr;
325
326 /* Don't allow bridging non-ethernet like devices */
327 if ((dev->flags & IFF_LOOPBACK) ||
328 dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN)
329 return -EINVAL;
330
331 /* No bridging of bridges */
332 if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
333 return -ELOOP;
334
335 /* Device is already being bridged */
336 if (br_port_exists(dev))
337 return -EBUSY;
338
339 /* No bridging devices that dislike that (e.g. wireless) */
340 if (dev->priv_flags & IFF_DONT_BRIDGE)
341 return -EOPNOTSUPP;
342
343 p = new_nbp(br, dev);
344 if (IS_ERR(p))
345 return PTR_ERR(p);
346
347 call_netdevice_notifiers(NETDEV_JOIN, dev);
348
349 err = dev_set_promiscuity(dev, 1);
350 if (err)
351 goto put_back;
352
353 err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
354 SYSFS_BRIDGE_PORT_ATTR);
355 if (err)
356 goto err0;
357
358 err = br_fdb_insert(br, p, dev->dev_addr);
359 if (err)
360 goto err1;
361
362 err = br_sysfs_addif(p);
363 if (err)
364 goto err2;
365
366 if (br_netpoll_info(br) && ((err = br_netpoll_enable(p))))
367 goto err3;
368
369 err = netdev_set_master(dev, br->dev);
370 if (err)
371 goto err3;
372
373 err = netdev_rx_handler_register(dev, br_handle_frame, p);
374 if (err)
375 goto err4;
376
377 dev->priv_flags |= IFF_BRIDGE_PORT;
378
379 dev_disable_lro(dev);
380
381 list_add_rcu(&p->list, &br->port_list);
382
383 netdev_update_features(br->dev);
384
385 spin_lock_bh(&br->lock);
386 changed_addr = br_stp_recalculate_bridge_id(br);
387
388 if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
389 (br->dev->flags & IFF_UP))
390 br_stp_enable_port(p);
391 spin_unlock_bh(&br->lock);
392
393 br_ifinfo_notify(RTM_NEWLINK, p);
394
395 if (changed_addr)
396 call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
397
398 dev_set_mtu(br->dev, br_min_mtu(br));
399
400 kobject_uevent(&p->kobj, KOBJ_ADD);
401
402 return 0;
403
404err4:
405 netdev_set_master(dev, NULL);
406err3:
407 sysfs_remove_link(br->ifobj, p->dev->name);
408err2:
409 br_fdb_delete_by_port(br, p, 1);
410err1:
411 kobject_put(&p->kobj);
412 p = NULL; /* kobject_put frees */
413err0:
414 dev_set_promiscuity(dev, -1);
415put_back:
416 dev_put(dev);
417 kfree(p);
418 return err;
419}
420
421/* called with RTNL */
422int br_del_if(struct net_bridge *br, struct net_device *dev)
423{
424 struct net_bridge_port *p;
425 bool changed_addr;
426
427 p = br_port_get_rtnl(dev);
428 if (!p || p->br != br)
429 return -EINVAL;
430
431 del_nbp(p);
432
433 spin_lock_bh(&br->lock);
434 changed_addr = br_stp_recalculate_bridge_id(br);
435 spin_unlock_bh(&br->lock);
436
437 if (changed_addr)
438 call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
439
440 netdev_update_features(br->dev);
441
442 return 0;
443}
444
445void __net_exit br_net_exit(struct net *net)
446{
447 struct net_device *dev;
448 LIST_HEAD(list);
449
450 rtnl_lock();
451 for_each_netdev(net, dev)
452 if (dev->priv_flags & IFF_EBRIDGE)
453 br_dev_delete(dev, &list);
454
455 unregister_netdevice_many(&list);
456 rtnl_unlock();
457
458}
1/*
2 * Userspace interface
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/netdevice.h>
16#include <linux/etherdevice.h>
17#include <linux/netpoll.h>
18#include <linux/ethtool.h>
19#include <linux/if_arp.h>
20#include <linux/module.h>
21#include <linux/init.h>
22#include <linux/rtnetlink.h>
23#include <linux/if_ether.h>
24#include <linux/slab.h>
25#include <net/sock.h>
26
27#include "br_private.h"
28
29/*
30 * Determine initial path cost based on speed.
31 * using recommendations from 802.1d standard
32 *
33 * Since driver might sleep need to not be holding any locks.
34 */
35static int port_cost(struct net_device *dev)
36{
37 struct ethtool_cmd ecmd;
38
39 if (!__ethtool_get_settings(dev, &ecmd)) {
40 switch (ethtool_cmd_speed(&ecmd)) {
41 case SPEED_10000:
42 return 2;
43 case SPEED_1000:
44 return 4;
45 case SPEED_100:
46 return 19;
47 case SPEED_10:
48 return 100;
49 }
50 }
51
52 /* Old silly heuristics based on name */
53 if (!strncmp(dev->name, "lec", 3))
54 return 7;
55
56 if (!strncmp(dev->name, "plip", 4))
57 return 2500;
58
59 return 100; /* assume old 10Mbps */
60}
61
62
63/* Check for port carrier transistions. */
64void br_port_carrier_check(struct net_bridge_port *p)
65{
66 struct net_device *dev = p->dev;
67 struct net_bridge *br = p->br;
68
69 if (netif_running(dev) && netif_carrier_ok(dev))
70 p->path_cost = port_cost(dev);
71
72 if (!netif_running(br->dev))
73 return;
74
75 spin_lock_bh(&br->lock);
76 if (netif_running(dev) && netif_carrier_ok(dev)) {
77 if (p->state == BR_STATE_DISABLED)
78 br_stp_enable_port(p);
79 } else {
80 if (p->state != BR_STATE_DISABLED)
81 br_stp_disable_port(p);
82 }
83 spin_unlock_bh(&br->lock);
84}
85
86static void release_nbp(struct kobject *kobj)
87{
88 struct net_bridge_port *p
89 = container_of(kobj, struct net_bridge_port, kobj);
90 kfree(p);
91}
92
93static struct kobj_type brport_ktype = {
94#ifdef CONFIG_SYSFS
95 .sysfs_ops = &brport_sysfs_ops,
96#endif
97 .release = release_nbp,
98};
99
100static void destroy_nbp(struct net_bridge_port *p)
101{
102 struct net_device *dev = p->dev;
103
104 p->br = NULL;
105 p->dev = NULL;
106 dev_put(dev);
107
108 kobject_put(&p->kobj);
109}
110
111static void destroy_nbp_rcu(struct rcu_head *head)
112{
113 struct net_bridge_port *p =
114 container_of(head, struct net_bridge_port, rcu);
115 destroy_nbp(p);
116}
117
118/* Delete port(interface) from bridge is done in two steps.
119 * via RCU. First step, marks device as down. That deletes
120 * all the timers and stops new packets from flowing through.
121 *
122 * Final cleanup doesn't occur until after all CPU's finished
123 * processing packets.
124 *
125 * Protected from multiple admin operations by RTNL mutex
126 */
127static void del_nbp(struct net_bridge_port *p)
128{
129 struct net_bridge *br = p->br;
130 struct net_device *dev = p->dev;
131
132 sysfs_remove_link(br->ifobj, p->dev->name);
133
134 dev_set_promiscuity(dev, -1);
135
136 spin_lock_bh(&br->lock);
137 br_stp_disable_port(p);
138 spin_unlock_bh(&br->lock);
139
140 br_ifinfo_notify(RTM_DELLINK, p);
141
142 br_fdb_delete_by_port(br, p, 1);
143
144 list_del_rcu(&p->list);
145
146 dev->priv_flags &= ~IFF_BRIDGE_PORT;
147
148 netdev_rx_handler_unregister(dev);
149 synchronize_net();
150
151 netdev_set_master(dev, NULL);
152
153 br_multicast_del_port(p);
154
155 kobject_uevent(&p->kobj, KOBJ_REMOVE);
156 kobject_del(&p->kobj);
157
158 br_netpoll_disable(p);
159
160 call_rcu(&p->rcu, destroy_nbp_rcu);
161}
162
163/* Delete bridge device */
164void br_dev_delete(struct net_device *dev, struct list_head *head)
165{
166 struct net_bridge *br = netdev_priv(dev);
167 struct net_bridge_port *p, *n;
168
169 list_for_each_entry_safe(p, n, &br->port_list, list) {
170 del_nbp(p);
171 }
172
173 del_timer_sync(&br->gc_timer);
174
175 br_sysfs_delbr(br->dev);
176 unregister_netdevice_queue(br->dev, head);
177}
178
179/* find an available port number */
180static int find_portno(struct net_bridge *br)
181{
182 int index;
183 struct net_bridge_port *p;
184 unsigned long *inuse;
185
186 inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
187 GFP_KERNEL);
188 if (!inuse)
189 return -ENOMEM;
190
191 set_bit(0, inuse); /* zero is reserved */
192 list_for_each_entry(p, &br->port_list, list) {
193 set_bit(p->port_no, inuse);
194 }
195 index = find_first_zero_bit(inuse, BR_MAX_PORTS);
196 kfree(inuse);
197
198 return (index >= BR_MAX_PORTS) ? -EXFULL : index;
199}
200
201/* called with RTNL but without bridge lock */
202static struct net_bridge_port *new_nbp(struct net_bridge *br,
203 struct net_device *dev)
204{
205 int index;
206 struct net_bridge_port *p;
207
208 index = find_portno(br);
209 if (index < 0)
210 return ERR_PTR(index);
211
212 p = kzalloc(sizeof(*p), GFP_KERNEL);
213 if (p == NULL)
214 return ERR_PTR(-ENOMEM);
215
216 p->br = br;
217 dev_hold(dev);
218 p->dev = dev;
219 p->path_cost = port_cost(dev);
220 p->priority = 0x8000 >> BR_PORT_BITS;
221 p->port_no = index;
222 p->flags = 0;
223 br_init_port(p);
224 p->state = BR_STATE_DISABLED;
225 br_stp_port_timer_init(p);
226 br_multicast_add_port(p);
227
228 return p;
229}
230
231int br_add_bridge(struct net *net, const char *name)
232{
233 struct net_device *dev;
234 int res;
235
236 dev = alloc_netdev(sizeof(struct net_bridge), name,
237 br_dev_setup);
238
239 if (!dev)
240 return -ENOMEM;
241
242 dev_net_set(dev, net);
243 dev->rtnl_link_ops = &br_link_ops;
244
245 res = register_netdev(dev);
246 if (res)
247 free_netdev(dev);
248 return res;
249}
250
251int br_del_bridge(struct net *net, const char *name)
252{
253 struct net_device *dev;
254 int ret = 0;
255
256 rtnl_lock();
257 dev = __dev_get_by_name(net, name);
258 if (dev == NULL)
259 ret = -ENXIO; /* Could not find device */
260
261 else if (!(dev->priv_flags & IFF_EBRIDGE)) {
262 /* Attempt to delete non bridge device! */
263 ret = -EPERM;
264 }
265
266 else if (dev->flags & IFF_UP) {
267 /* Not shutdown yet. */
268 ret = -EBUSY;
269 }
270
271 else
272 br_dev_delete(dev, NULL);
273
274 rtnl_unlock();
275 return ret;
276}
277
278/* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */
279int br_min_mtu(const struct net_bridge *br)
280{
281 const struct net_bridge_port *p;
282 int mtu = 0;
283
284 ASSERT_RTNL();
285
286 if (list_empty(&br->port_list))
287 mtu = ETH_DATA_LEN;
288 else {
289 list_for_each_entry(p, &br->port_list, list) {
290 if (!mtu || p->dev->mtu < mtu)
291 mtu = p->dev->mtu;
292 }
293 }
294 return mtu;
295}
296
297/*
298 * Recomputes features using slave's features
299 */
300netdev_features_t br_features_recompute(struct net_bridge *br,
301 netdev_features_t features)
302{
303 struct net_bridge_port *p;
304 netdev_features_t mask;
305
306 if (list_empty(&br->port_list))
307 return features;
308
309 mask = features;
310 features &= ~NETIF_F_ONE_FOR_ALL;
311
312 list_for_each_entry(p, &br->port_list, list) {
313 features = netdev_increment_features(features,
314 p->dev->features, mask);
315 }
316
317 return features;
318}
319
320/* called with RTNL */
321int br_add_if(struct net_bridge *br, struct net_device *dev)
322{
323 struct net_bridge_port *p;
324 int err = 0;
325 bool changed_addr;
326
327 /* Don't allow bridging non-ethernet like devices */
328 if ((dev->flags & IFF_LOOPBACK) ||
329 dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN ||
330 !is_valid_ether_addr(dev->dev_addr))
331 return -EINVAL;
332
333 /* No bridging of bridges */
334 if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit)
335 return -ELOOP;
336
337 /* Device is already being bridged */
338 if (br_port_exists(dev))
339 return -EBUSY;
340
341 /* No bridging devices that dislike that (e.g. wireless) */
342 if (dev->priv_flags & IFF_DONT_BRIDGE)
343 return -EOPNOTSUPP;
344
345 p = new_nbp(br, dev);
346 if (IS_ERR(p))
347 return PTR_ERR(p);
348
349 call_netdevice_notifiers(NETDEV_JOIN, dev);
350
351 err = dev_set_promiscuity(dev, 1);
352 if (err)
353 goto put_back;
354
355 err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj),
356 SYSFS_BRIDGE_PORT_ATTR);
357 if (err)
358 goto err1;
359
360 err = br_sysfs_addif(p);
361 if (err)
362 goto err2;
363
364 if (br_netpoll_info(br) && ((err = br_netpoll_enable(p))))
365 goto err3;
366
367 err = netdev_set_master(dev, br->dev);
368 if (err)
369 goto err3;
370
371 err = netdev_rx_handler_register(dev, br_handle_frame, p);
372 if (err)
373 goto err4;
374
375 dev->priv_flags |= IFF_BRIDGE_PORT;
376
377 dev_disable_lro(dev);
378
379 list_add_rcu(&p->list, &br->port_list);
380
381 netdev_update_features(br->dev);
382
383 spin_lock_bh(&br->lock);
384 changed_addr = br_stp_recalculate_bridge_id(br);
385
386 if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) &&
387 (br->dev->flags & IFF_UP))
388 br_stp_enable_port(p);
389 spin_unlock_bh(&br->lock);
390
391 br_ifinfo_notify(RTM_NEWLINK, p);
392
393 if (changed_addr)
394 call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
395
396 dev_set_mtu(br->dev, br_min_mtu(br));
397
398 if (br_fdb_insert(br, p, dev->dev_addr))
399 netdev_err(dev, "failed insert local address bridge forwarding table\n");
400
401 kobject_uevent(&p->kobj, KOBJ_ADD);
402
403 return 0;
404
405err4:
406 netdev_set_master(dev, NULL);
407err3:
408 sysfs_remove_link(br->ifobj, p->dev->name);
409err2:
410 kobject_put(&p->kobj);
411 p = NULL; /* kobject_put frees */
412err1:
413 dev_set_promiscuity(dev, -1);
414put_back:
415 dev_put(dev);
416 kfree(p);
417 return err;
418}
419
420/* called with RTNL */
421int br_del_if(struct net_bridge *br, struct net_device *dev)
422{
423 struct net_bridge_port *p;
424 bool changed_addr;
425
426 p = br_port_get_rtnl(dev);
427 if (!p || p->br != br)
428 return -EINVAL;
429
430 del_nbp(p);
431
432 spin_lock_bh(&br->lock);
433 changed_addr = br_stp_recalculate_bridge_id(br);
434 spin_unlock_bh(&br->lock);
435
436 if (changed_addr)
437 call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev);
438
439 netdev_update_features(br->dev);
440
441 return 0;
442}
443
444void __net_exit br_net_exit(struct net *net)
445{
446 struct net_device *dev;
447 LIST_HEAD(list);
448
449 rtnl_lock();
450 for_each_netdev(net, dev)
451 if (dev->priv_flags & IFF_EBRIDGE)
452 br_dev_delete(dev, &list);
453
454 unregister_netdevice_many(&list);
455 rtnl_unlock();
456
457}