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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Sysfs attributes of bridge ports
4 * Linux ethernet bridge
5 *
6 * Authors:
7 * Stephen Hemminger <shemminger@osdl.org>
8 */
9
10#include <linux/capability.h>
11#include <linux/kernel.h>
12#include <linux/netdevice.h>
13#include <linux/if_bridge.h>
14#include <linux/rtnetlink.h>
15#include <linux/spinlock.h>
16#include <linux/sched/signal.h>
17
18#include "br_private.h"
19
20struct brport_attribute {
21 struct attribute attr;
22 ssize_t (*show)(struct net_bridge_port *, char *);
23 int (*store)(struct net_bridge_port *, unsigned long);
24 int (*store_raw)(struct net_bridge_port *, char *);
25};
26
27#define BRPORT_ATTR_RAW(_name, _mode, _show, _store) \
28const struct brport_attribute brport_attr_##_name = { \
29 .attr = {.name = __stringify(_name), \
30 .mode = _mode }, \
31 .show = _show, \
32 .store_raw = _store, \
33};
34
35#define BRPORT_ATTR(_name, _mode, _show, _store) \
36const struct brport_attribute brport_attr_##_name = { \
37 .attr = {.name = __stringify(_name), \
38 .mode = _mode }, \
39 .show = _show, \
40 .store = _store, \
41};
42
43#define BRPORT_ATTR_FLAG(_name, _mask) \
44static ssize_t show_##_name(struct net_bridge_port *p, char *buf) \
45{ \
46 return sprintf(buf, "%d\n", !!(p->flags & _mask)); \
47} \
48static int store_##_name(struct net_bridge_port *p, unsigned long v) \
49{ \
50 return store_flag(p, v, _mask); \
51} \
52static BRPORT_ATTR(_name, 0644, \
53 show_##_name, store_##_name)
54
55static int store_flag(struct net_bridge_port *p, unsigned long v,
56 unsigned long mask)
57{
58 unsigned long flags;
59
60 flags = p->flags;
61
62 if (v)
63 flags |= mask;
64 else
65 flags &= ~mask;
66
67 if (flags != p->flags) {
68 p->flags = flags;
69 br_port_flags_change(p, mask);
70 }
71 return 0;
72}
73
74static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
75{
76 return sprintf(buf, "%d\n", p->path_cost);
77}
78
79static BRPORT_ATTR(path_cost, 0644,
80 show_path_cost, br_stp_set_path_cost);
81
82static ssize_t show_priority(struct net_bridge_port *p, char *buf)
83{
84 return sprintf(buf, "%d\n", p->priority);
85}
86
87static BRPORT_ATTR(priority, 0644,
88 show_priority, br_stp_set_port_priority);
89
90static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
91{
92 return br_show_bridge_id(buf, &p->designated_root);
93}
94static BRPORT_ATTR(designated_root, 0444, show_designated_root, NULL);
95
96static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
97{
98 return br_show_bridge_id(buf, &p->designated_bridge);
99}
100static BRPORT_ATTR(designated_bridge, 0444, show_designated_bridge, NULL);
101
102static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
103{
104 return sprintf(buf, "%d\n", p->designated_port);
105}
106static BRPORT_ATTR(designated_port, 0444, show_designated_port, NULL);
107
108static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
109{
110 return sprintf(buf, "%d\n", p->designated_cost);
111}
112static BRPORT_ATTR(designated_cost, 0444, show_designated_cost, NULL);
113
114static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
115{
116 return sprintf(buf, "0x%x\n", p->port_id);
117}
118static BRPORT_ATTR(port_id, 0444, show_port_id, NULL);
119
120static ssize_t show_port_no(struct net_bridge_port *p, char *buf)
121{
122 return sprintf(buf, "0x%x\n", p->port_no);
123}
124
125static BRPORT_ATTR(port_no, 0444, show_port_no, NULL);
126
127static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
128{
129 return sprintf(buf, "%d\n", p->topology_change_ack);
130}
131static BRPORT_ATTR(change_ack, 0444, show_change_ack, NULL);
132
133static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
134{
135 return sprintf(buf, "%d\n", p->config_pending);
136}
137static BRPORT_ATTR(config_pending, 0444, show_config_pending, NULL);
138
139static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
140{
141 return sprintf(buf, "%d\n", p->state);
142}
143static BRPORT_ATTR(state, 0444, show_port_state, NULL);
144
145static ssize_t show_message_age_timer(struct net_bridge_port *p,
146 char *buf)
147{
148 return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
149}
150static BRPORT_ATTR(message_age_timer, 0444, show_message_age_timer, NULL);
151
152static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
153 char *buf)
154{
155 return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
156}
157static BRPORT_ATTR(forward_delay_timer, 0444, show_forward_delay_timer, NULL);
158
159static ssize_t show_hold_timer(struct net_bridge_port *p,
160 char *buf)
161{
162 return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
163}
164static BRPORT_ATTR(hold_timer, 0444, show_hold_timer, NULL);
165
166static int store_flush(struct net_bridge_port *p, unsigned long v)
167{
168 br_fdb_delete_by_port(p->br, p, 0, 0); // Don't delete local entry
169 return 0;
170}
171static BRPORT_ATTR(flush, 0200, NULL, store_flush);
172
173static ssize_t show_group_fwd_mask(struct net_bridge_port *p, char *buf)
174{
175 return sprintf(buf, "%#x\n", p->group_fwd_mask);
176}
177
178static int store_group_fwd_mask(struct net_bridge_port *p,
179 unsigned long v)
180{
181 if (v & BR_GROUPFWD_MACPAUSE)
182 return -EINVAL;
183 p->group_fwd_mask = v;
184
185 return 0;
186}
187static BRPORT_ATTR(group_fwd_mask, 0644, show_group_fwd_mask,
188 store_group_fwd_mask);
189
190static ssize_t show_backup_port(struct net_bridge_port *p, char *buf)
191{
192 struct net_bridge_port *backup_p;
193 int ret = 0;
194
195 rcu_read_lock();
196 backup_p = rcu_dereference(p->backup_port);
197 if (backup_p)
198 ret = sprintf(buf, "%s\n", backup_p->dev->name);
199 rcu_read_unlock();
200
201 return ret;
202}
203
204static int store_backup_port(struct net_bridge_port *p, char *buf)
205{
206 struct net_device *backup_dev = NULL;
207 char *nl = strchr(buf, '\n');
208
209 if (nl)
210 *nl = '\0';
211
212 if (strlen(buf) > 0) {
213 backup_dev = __dev_get_by_name(dev_net(p->dev), buf);
214 if (!backup_dev)
215 return -ENOENT;
216 }
217
218 return nbp_backup_change(p, backup_dev);
219}
220static BRPORT_ATTR_RAW(backup_port, 0644, show_backup_port, store_backup_port);
221
222BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
223BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
224BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
225BRPORT_ATTR_FLAG(learning, BR_LEARNING);
226BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD);
227BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP);
228BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
229BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLOOD);
230BRPORT_ATTR_FLAG(broadcast_flood, BR_BCAST_FLOOD);
231BRPORT_ATTR_FLAG(neigh_suppress, BR_NEIGH_SUPPRESS);
232BRPORT_ATTR_FLAG(isolated, BR_ISOLATED);
233
234#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
235static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
236{
237 return sprintf(buf, "%d\n", p->multicast_router);
238}
239
240static int store_multicast_router(struct net_bridge_port *p,
241 unsigned long v)
242{
243 return br_multicast_set_port_router(p, v);
244}
245static BRPORT_ATTR(multicast_router, 0644, show_multicast_router,
246 store_multicast_router);
247
248BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
249BRPORT_ATTR_FLAG(multicast_to_unicast, BR_MULTICAST_TO_UNICAST);
250#endif
251
252static const struct brport_attribute *brport_attrs[] = {
253 &brport_attr_path_cost,
254 &brport_attr_priority,
255 &brport_attr_port_id,
256 &brport_attr_port_no,
257 &brport_attr_designated_root,
258 &brport_attr_designated_bridge,
259 &brport_attr_designated_port,
260 &brport_attr_designated_cost,
261 &brport_attr_state,
262 &brport_attr_change_ack,
263 &brport_attr_config_pending,
264 &brport_attr_message_age_timer,
265 &brport_attr_forward_delay_timer,
266 &brport_attr_hold_timer,
267 &brport_attr_flush,
268 &brport_attr_hairpin_mode,
269 &brport_attr_bpdu_guard,
270 &brport_attr_root_block,
271 &brport_attr_learning,
272 &brport_attr_unicast_flood,
273#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
274 &brport_attr_multicast_router,
275 &brport_attr_multicast_fast_leave,
276 &brport_attr_multicast_to_unicast,
277#endif
278 &brport_attr_proxyarp,
279 &brport_attr_proxyarp_wifi,
280 &brport_attr_multicast_flood,
281 &brport_attr_broadcast_flood,
282 &brport_attr_group_fwd_mask,
283 &brport_attr_neigh_suppress,
284 &brport_attr_isolated,
285 &brport_attr_backup_port,
286 NULL
287};
288
289#define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
290
291static ssize_t brport_show(struct kobject *kobj,
292 struct attribute *attr, char *buf)
293{
294 struct brport_attribute *brport_attr = to_brport_attr(attr);
295 struct net_bridge_port *p = kobj_to_brport(kobj);
296
297 if (!brport_attr->show)
298 return -EINVAL;
299
300 return brport_attr->show(p, buf);
301}
302
303static ssize_t brport_store(struct kobject *kobj,
304 struct attribute *attr,
305 const char *buf, size_t count)
306{
307 struct brport_attribute *brport_attr = to_brport_attr(attr);
308 struct net_bridge_port *p = kobj_to_brport(kobj);
309 ssize_t ret = -EINVAL;
310 unsigned long val;
311 char *endp;
312
313 if (!ns_capable(dev_net(p->dev)->user_ns, CAP_NET_ADMIN))
314 return -EPERM;
315
316 if (!rtnl_trylock())
317 return restart_syscall();
318
319 if (brport_attr->store_raw) {
320 char *buf_copy;
321
322 buf_copy = kstrndup(buf, count, GFP_KERNEL);
323 if (!buf_copy) {
324 ret = -ENOMEM;
325 goto out_unlock;
326 }
327 spin_lock_bh(&p->br->lock);
328 ret = brport_attr->store_raw(p, buf_copy);
329 spin_unlock_bh(&p->br->lock);
330 kfree(buf_copy);
331 } else if (brport_attr->store) {
332 val = simple_strtoul(buf, &endp, 0);
333 if (endp == buf)
334 goto out_unlock;
335 spin_lock_bh(&p->br->lock);
336 ret = brport_attr->store(p, val);
337 spin_unlock_bh(&p->br->lock);
338 }
339
340 if (!ret) {
341 br_ifinfo_notify(RTM_NEWLINK, NULL, p);
342 ret = count;
343 }
344out_unlock:
345 rtnl_unlock();
346
347 return ret;
348}
349
350const struct sysfs_ops brport_sysfs_ops = {
351 .show = brport_show,
352 .store = brport_store,
353};
354
355/*
356 * Add sysfs entries to ethernet device added to a bridge.
357 * Creates a brport subdirectory with bridge attributes.
358 * Puts symlink in bridge's brif subdirectory
359 */
360int br_sysfs_addif(struct net_bridge_port *p)
361{
362 struct net_bridge *br = p->br;
363 const struct brport_attribute **a;
364 int err;
365
366 err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
367 SYSFS_BRIDGE_PORT_LINK);
368 if (err)
369 return err;
370
371 for (a = brport_attrs; *a; ++a) {
372 err = sysfs_create_file(&p->kobj, &((*a)->attr));
373 if (err)
374 return err;
375 }
376
377 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
378 return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name);
379}
380
381/* Rename bridge's brif symlink */
382int br_sysfs_renameif(struct net_bridge_port *p)
383{
384 struct net_bridge *br = p->br;
385 int err;
386
387 /* If a rename fails, the rollback will cause another
388 * rename call with the existing name.
389 */
390 if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ))
391 return 0;
392
393 err = sysfs_rename_link(br->ifobj, &p->kobj,
394 p->sysfs_name, p->dev->name);
395 if (err)
396 netdev_notice(br->dev, "unable to rename link %s to %s",
397 p->sysfs_name, p->dev->name);
398 else
399 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
400
401 return err;
402}
1/*
2 * Sysfs attributes of bridge ports
3 * Linux ethernet bridge
4 *
5 * Authors:
6 * Stephen Hemminger <shemminger@osdl.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/capability.h>
15#include <linux/kernel.h>
16#include <linux/netdevice.h>
17#include <linux/if_bridge.h>
18#include <linux/rtnetlink.h>
19#include <linux/spinlock.h>
20
21#include "br_private.h"
22
23struct brport_attribute {
24 struct attribute attr;
25 ssize_t (*show)(struct net_bridge_port *, char *);
26 int (*store)(struct net_bridge_port *, unsigned long);
27};
28
29#define BRPORT_ATTR(_name, _mode, _show, _store) \
30const struct brport_attribute brport_attr_##_name = { \
31 .attr = {.name = __stringify(_name), \
32 .mode = _mode }, \
33 .show = _show, \
34 .store = _store, \
35};
36
37#define BRPORT_ATTR_FLAG(_name, _mask) \
38static ssize_t show_##_name(struct net_bridge_port *p, char *buf) \
39{ \
40 return sprintf(buf, "%d\n", !!(p->flags & _mask)); \
41} \
42static int store_##_name(struct net_bridge_port *p, unsigned long v) \
43{ \
44 unsigned long flags = p->flags; \
45 if (v) \
46 flags |= _mask; \
47 else \
48 flags &= ~_mask; \
49 if (flags != p->flags) { \
50 p->flags = flags; \
51 br_ifinfo_notify(RTM_NEWLINK, p); \
52 } \
53 return 0; \
54} \
55static BRPORT_ATTR(_name, S_IRUGO | S_IWUSR, \
56 show_##_name, store_##_name)
57
58
59static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
60{
61 return sprintf(buf, "%d\n", p->path_cost);
62}
63
64static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
65 show_path_cost, br_stp_set_path_cost);
66
67static ssize_t show_priority(struct net_bridge_port *p, char *buf)
68{
69 return sprintf(buf, "%d\n", p->priority);
70}
71
72static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
73 show_priority, br_stp_set_port_priority);
74
75static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
76{
77 return br_show_bridge_id(buf, &p->designated_root);
78}
79static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
80
81static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
82{
83 return br_show_bridge_id(buf, &p->designated_bridge);
84}
85static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
86
87static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
88{
89 return sprintf(buf, "%d\n", p->designated_port);
90}
91static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
92
93static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
94{
95 return sprintf(buf, "%d\n", p->designated_cost);
96}
97static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
98
99static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
100{
101 return sprintf(buf, "0x%x\n", p->port_id);
102}
103static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
104
105static ssize_t show_port_no(struct net_bridge_port *p, char *buf)
106{
107 return sprintf(buf, "0x%x\n", p->port_no);
108}
109
110static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
111
112static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
113{
114 return sprintf(buf, "%d\n", p->topology_change_ack);
115}
116static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
117
118static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
119{
120 return sprintf(buf, "%d\n", p->config_pending);
121}
122static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
123
124static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
125{
126 return sprintf(buf, "%d\n", p->state);
127}
128static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
129
130static ssize_t show_message_age_timer(struct net_bridge_port *p,
131 char *buf)
132{
133 return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
134}
135static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
136
137static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
138 char *buf)
139{
140 return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
141}
142static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
143
144static ssize_t show_hold_timer(struct net_bridge_port *p,
145 char *buf)
146{
147 return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
148}
149static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
150
151static int store_flush(struct net_bridge_port *p, unsigned long v)
152{
153 br_fdb_delete_by_port(p->br, p, 0); // Don't delete local entry
154 return 0;
155}
156static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
157
158BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
159BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
160BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
161BRPORT_ATTR_FLAG(learning, BR_LEARNING);
162BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD);
163
164#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
165static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
166{
167 return sprintf(buf, "%d\n", p->multicast_router);
168}
169
170static int store_multicast_router(struct net_bridge_port *p,
171 unsigned long v)
172{
173 return br_multicast_set_port_router(p, v);
174}
175static BRPORT_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router,
176 store_multicast_router);
177
178BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
179#endif
180
181static const struct brport_attribute *brport_attrs[] = {
182 &brport_attr_path_cost,
183 &brport_attr_priority,
184 &brport_attr_port_id,
185 &brport_attr_port_no,
186 &brport_attr_designated_root,
187 &brport_attr_designated_bridge,
188 &brport_attr_designated_port,
189 &brport_attr_designated_cost,
190 &brport_attr_state,
191 &brport_attr_change_ack,
192 &brport_attr_config_pending,
193 &brport_attr_message_age_timer,
194 &brport_attr_forward_delay_timer,
195 &brport_attr_hold_timer,
196 &brport_attr_flush,
197 &brport_attr_hairpin_mode,
198 &brport_attr_bpdu_guard,
199 &brport_attr_root_block,
200 &brport_attr_learning,
201 &brport_attr_unicast_flood,
202#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
203 &brport_attr_multicast_router,
204 &brport_attr_multicast_fast_leave,
205#endif
206 NULL
207};
208
209#define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
210#define to_brport(obj) container_of(obj, struct net_bridge_port, kobj)
211
212static ssize_t brport_show(struct kobject *kobj,
213 struct attribute *attr, char *buf)
214{
215 struct brport_attribute *brport_attr = to_brport_attr(attr);
216 struct net_bridge_port *p = to_brport(kobj);
217
218 return brport_attr->show(p, buf);
219}
220
221static ssize_t brport_store(struct kobject *kobj,
222 struct attribute *attr,
223 const char *buf, size_t count)
224{
225 struct brport_attribute *brport_attr = to_brport_attr(attr);
226 struct net_bridge_port *p = to_brport(kobj);
227 ssize_t ret = -EINVAL;
228 char *endp;
229 unsigned long val;
230
231 if (!ns_capable(dev_net(p->dev)->user_ns, CAP_NET_ADMIN))
232 return -EPERM;
233
234 val = simple_strtoul(buf, &endp, 0);
235 if (endp != buf) {
236 if (!rtnl_trylock())
237 return restart_syscall();
238 if (p->dev && p->br && brport_attr->store) {
239 spin_lock_bh(&p->br->lock);
240 ret = brport_attr->store(p, val);
241 spin_unlock_bh(&p->br->lock);
242 if (ret == 0)
243 ret = count;
244 }
245 rtnl_unlock();
246 }
247 return ret;
248}
249
250const struct sysfs_ops brport_sysfs_ops = {
251 .show = brport_show,
252 .store = brport_store,
253};
254
255/*
256 * Add sysfs entries to ethernet device added to a bridge.
257 * Creates a brport subdirectory with bridge attributes.
258 * Puts symlink in bridge's brif subdirectory
259 */
260int br_sysfs_addif(struct net_bridge_port *p)
261{
262 struct net_bridge *br = p->br;
263 const struct brport_attribute **a;
264 int err;
265
266 err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
267 SYSFS_BRIDGE_PORT_LINK);
268 if (err)
269 return err;
270
271 for (a = brport_attrs; *a; ++a) {
272 err = sysfs_create_file(&p->kobj, &((*a)->attr));
273 if (err)
274 return err;
275 }
276
277 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
278 return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name);
279}
280
281/* Rename bridge's brif symlink */
282int br_sysfs_renameif(struct net_bridge_port *p)
283{
284 struct net_bridge *br = p->br;
285 int err;
286
287 /* If a rename fails, the rollback will cause another
288 * rename call with the existing name.
289 */
290 if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ))
291 return 0;
292
293 err = sysfs_rename_link(br->ifobj, &p->kobj,
294 p->sysfs_name, p->dev->name);
295 if (err)
296 netdev_notice(br->dev, "unable to rename link %s to %s",
297 p->sysfs_name, p->dev->name);
298 else
299 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
300
301 return err;
302}