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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 return store_flag(p, v, _mask); \
45} \
46static BRPORT_ATTR(_name, S_IRUGO | S_IWUSR, \
47 show_##_name, store_##_name)
48
49static int store_flag(struct net_bridge_port *p, unsigned long v,
50 unsigned long mask)
51{
52 unsigned long flags;
53
54 flags = p->flags;
55
56 if (v)
57 flags |= mask;
58 else
59 flags &= ~mask;
60
61 if (flags != p->flags) {
62 p->flags = flags;
63 br_port_flags_change(p, mask);
64 br_ifinfo_notify(RTM_NEWLINK, p);
65 }
66 return 0;
67}
68
69static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
70{
71 return sprintf(buf, "%d\n", p->path_cost);
72}
73
74static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
75 show_path_cost, br_stp_set_path_cost);
76
77static ssize_t show_priority(struct net_bridge_port *p, char *buf)
78{
79 return sprintf(buf, "%d\n", p->priority);
80}
81
82static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
83 show_priority, br_stp_set_port_priority);
84
85static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
86{
87 return br_show_bridge_id(buf, &p->designated_root);
88}
89static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
90
91static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
92{
93 return br_show_bridge_id(buf, &p->designated_bridge);
94}
95static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
96
97static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
98{
99 return sprintf(buf, "%d\n", p->designated_port);
100}
101static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
102
103static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
104{
105 return sprintf(buf, "%d\n", p->designated_cost);
106}
107static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
108
109static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
110{
111 return sprintf(buf, "0x%x\n", p->port_id);
112}
113static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
114
115static ssize_t show_port_no(struct net_bridge_port *p, char *buf)
116{
117 return sprintf(buf, "0x%x\n", p->port_no);
118}
119
120static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
121
122static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
123{
124 return sprintf(buf, "%d\n", p->topology_change_ack);
125}
126static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
127
128static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
129{
130 return sprintf(buf, "%d\n", p->config_pending);
131}
132static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
133
134static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
135{
136 return sprintf(buf, "%d\n", p->state);
137}
138static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
139
140static ssize_t show_message_age_timer(struct net_bridge_port *p,
141 char *buf)
142{
143 return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
144}
145static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
146
147static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
148 char *buf)
149{
150 return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
151}
152static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
153
154static ssize_t show_hold_timer(struct net_bridge_port *p,
155 char *buf)
156{
157 return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
158}
159static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
160
161static int store_flush(struct net_bridge_port *p, unsigned long v)
162{
163 br_fdb_delete_by_port(p->br, p, 0, 0); // Don't delete local entry
164 return 0;
165}
166static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
167
168BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
169BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
170BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
171BRPORT_ATTR_FLAG(learning, BR_LEARNING);
172BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD);
173BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP);
174BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
175
176#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
177static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
178{
179 return sprintf(buf, "%d\n", p->multicast_router);
180}
181
182static int store_multicast_router(struct net_bridge_port *p,
183 unsigned long v)
184{
185 return br_multicast_set_port_router(p, v);
186}
187static BRPORT_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router,
188 store_multicast_router);
189
190BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
191#endif
192
193static const struct brport_attribute *brport_attrs[] = {
194 &brport_attr_path_cost,
195 &brport_attr_priority,
196 &brport_attr_port_id,
197 &brport_attr_port_no,
198 &brport_attr_designated_root,
199 &brport_attr_designated_bridge,
200 &brport_attr_designated_port,
201 &brport_attr_designated_cost,
202 &brport_attr_state,
203 &brport_attr_change_ack,
204 &brport_attr_config_pending,
205 &brport_attr_message_age_timer,
206 &brport_attr_forward_delay_timer,
207 &brport_attr_hold_timer,
208 &brport_attr_flush,
209 &brport_attr_hairpin_mode,
210 &brport_attr_bpdu_guard,
211 &brport_attr_root_block,
212 &brport_attr_learning,
213 &brport_attr_unicast_flood,
214#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
215 &brport_attr_multicast_router,
216 &brport_attr_multicast_fast_leave,
217#endif
218 &brport_attr_proxyarp,
219 &brport_attr_proxyarp_wifi,
220 NULL
221};
222
223#define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
224#define to_brport(obj) container_of(obj, struct net_bridge_port, kobj)
225
226static ssize_t brport_show(struct kobject *kobj,
227 struct attribute *attr, char *buf)
228{
229 struct brport_attribute *brport_attr = to_brport_attr(attr);
230 struct net_bridge_port *p = to_brport(kobj);
231
232 return brport_attr->show(p, buf);
233}
234
235static ssize_t brport_store(struct kobject *kobj,
236 struct attribute *attr,
237 const char *buf, size_t count)
238{
239 struct brport_attribute *brport_attr = to_brport_attr(attr);
240 struct net_bridge_port *p = to_brport(kobj);
241 ssize_t ret = -EINVAL;
242 char *endp;
243 unsigned long val;
244
245 if (!ns_capable(dev_net(p->dev)->user_ns, CAP_NET_ADMIN))
246 return -EPERM;
247
248 val = simple_strtoul(buf, &endp, 0);
249 if (endp != buf) {
250 if (!rtnl_trylock())
251 return restart_syscall();
252 if (p->dev && p->br && brport_attr->store) {
253 spin_lock_bh(&p->br->lock);
254 ret = brport_attr->store(p, val);
255 spin_unlock_bh(&p->br->lock);
256 if (ret == 0)
257 ret = count;
258 }
259 rtnl_unlock();
260 }
261 return ret;
262}
263
264const struct sysfs_ops brport_sysfs_ops = {
265 .show = brport_show,
266 .store = brport_store,
267};
268
269/*
270 * Add sysfs entries to ethernet device added to a bridge.
271 * Creates a brport subdirectory with bridge attributes.
272 * Puts symlink in bridge's brif subdirectory
273 */
274int br_sysfs_addif(struct net_bridge_port *p)
275{
276 struct net_bridge *br = p->br;
277 const struct brport_attribute **a;
278 int err;
279
280 err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
281 SYSFS_BRIDGE_PORT_LINK);
282 if (err)
283 return err;
284
285 for (a = brport_attrs; *a; ++a) {
286 err = sysfs_create_file(&p->kobj, &((*a)->attr));
287 if (err)
288 return err;
289 }
290
291 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
292 return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name);
293}
294
295/* Rename bridge's brif symlink */
296int br_sysfs_renameif(struct net_bridge_port *p)
297{
298 struct net_bridge *br = p->br;
299 int err;
300
301 /* If a rename fails, the rollback will cause another
302 * rename call with the existing name.
303 */
304 if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ))
305 return 0;
306
307 err = sysfs_rename_link(br->ifobj, &p->kobj,
308 p->sysfs_name, p->dev->name);
309 if (err)
310 netdev_notice(br->dev, "unable to rename link %s to %s",
311 p->sysfs_name, p->dev->name);
312 else
313 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
314
315 return err;
316}
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 return store_flag(p, v, _mask); \
45} \
46static BRPORT_ATTR(_name, S_IRUGO | S_IWUSR, \
47 show_##_name, store_##_name)
48
49static int store_flag(struct net_bridge_port *p, unsigned long v,
50 unsigned long mask)
51{
52 unsigned long flags;
53
54 flags = p->flags;
55
56 if (v)
57 flags |= mask;
58 else
59 flags &= ~mask;
60
61 if (flags != p->flags) {
62 p->flags = flags;
63 br_port_flags_change(p, mask);
64 }
65 return 0;
66}
67
68static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
69{
70 return sprintf(buf, "%d\n", p->path_cost);
71}
72
73static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
74 show_path_cost, br_stp_set_path_cost);
75
76static ssize_t show_priority(struct net_bridge_port *p, char *buf)
77{
78 return sprintf(buf, "%d\n", p->priority);
79}
80
81static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
82 show_priority, br_stp_set_port_priority);
83
84static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
85{
86 return br_show_bridge_id(buf, &p->designated_root);
87}
88static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
89
90static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
91{
92 return br_show_bridge_id(buf, &p->designated_bridge);
93}
94static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
95
96static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
97{
98 return sprintf(buf, "%d\n", p->designated_port);
99}
100static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
101
102static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
103{
104 return sprintf(buf, "%d\n", p->designated_cost);
105}
106static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
107
108static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
109{
110 return sprintf(buf, "0x%x\n", p->port_id);
111}
112static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
113
114static ssize_t show_port_no(struct net_bridge_port *p, char *buf)
115{
116 return sprintf(buf, "0x%x\n", p->port_no);
117}
118
119static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
120
121static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
122{
123 return sprintf(buf, "%d\n", p->topology_change_ack);
124}
125static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
126
127static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
128{
129 return sprintf(buf, "%d\n", p->config_pending);
130}
131static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
132
133static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
134{
135 return sprintf(buf, "%d\n", p->state);
136}
137static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
138
139static ssize_t show_message_age_timer(struct net_bridge_port *p,
140 char *buf)
141{
142 return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
143}
144static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
145
146static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
147 char *buf)
148{
149 return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
150}
151static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
152
153static ssize_t show_hold_timer(struct net_bridge_port *p,
154 char *buf)
155{
156 return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
157}
158static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
159
160static int store_flush(struct net_bridge_port *p, unsigned long v)
161{
162 br_fdb_delete_by_port(p->br, p, 0, 0); // Don't delete local entry
163 return 0;
164}
165static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
166
167BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
168BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
169BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
170BRPORT_ATTR_FLAG(learning, BR_LEARNING);
171BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD);
172BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP);
173BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
174BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLOOD);
175
176#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
177static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
178{
179 return sprintf(buf, "%d\n", p->multicast_router);
180}
181
182static int store_multicast_router(struct net_bridge_port *p,
183 unsigned long v)
184{
185 return br_multicast_set_port_router(p, v);
186}
187static BRPORT_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router,
188 store_multicast_router);
189
190BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
191#endif
192
193static const struct brport_attribute *brport_attrs[] = {
194 &brport_attr_path_cost,
195 &brport_attr_priority,
196 &brport_attr_port_id,
197 &brport_attr_port_no,
198 &brport_attr_designated_root,
199 &brport_attr_designated_bridge,
200 &brport_attr_designated_port,
201 &brport_attr_designated_cost,
202 &brport_attr_state,
203 &brport_attr_change_ack,
204 &brport_attr_config_pending,
205 &brport_attr_message_age_timer,
206 &brport_attr_forward_delay_timer,
207 &brport_attr_hold_timer,
208 &brport_attr_flush,
209 &brport_attr_hairpin_mode,
210 &brport_attr_bpdu_guard,
211 &brport_attr_root_block,
212 &brport_attr_learning,
213 &brport_attr_unicast_flood,
214#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
215 &brport_attr_multicast_router,
216 &brport_attr_multicast_fast_leave,
217#endif
218 &brport_attr_proxyarp,
219 &brport_attr_proxyarp_wifi,
220 &brport_attr_multicast_flood,
221 NULL
222};
223
224#define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
225#define to_brport(obj) container_of(obj, struct net_bridge_port, kobj)
226
227static ssize_t brport_show(struct kobject *kobj,
228 struct attribute *attr, char *buf)
229{
230 struct brport_attribute *brport_attr = to_brport_attr(attr);
231 struct net_bridge_port *p = to_brport(kobj);
232
233 return brport_attr->show(p, buf);
234}
235
236static ssize_t brport_store(struct kobject *kobj,
237 struct attribute *attr,
238 const char *buf, size_t count)
239{
240 struct brport_attribute *brport_attr = to_brport_attr(attr);
241 struct net_bridge_port *p = to_brport(kobj);
242 ssize_t ret = -EINVAL;
243 char *endp;
244 unsigned long val;
245
246 if (!ns_capable(dev_net(p->dev)->user_ns, CAP_NET_ADMIN))
247 return -EPERM;
248
249 val = simple_strtoul(buf, &endp, 0);
250 if (endp != buf) {
251 if (!rtnl_trylock())
252 return restart_syscall();
253 if (p->dev && p->br && brport_attr->store) {
254 spin_lock_bh(&p->br->lock);
255 ret = brport_attr->store(p, val);
256 spin_unlock_bh(&p->br->lock);
257 if (!ret) {
258 br_ifinfo_notify(RTM_NEWLINK, p);
259 ret = count;
260 }
261 }
262 rtnl_unlock();
263 }
264 return ret;
265}
266
267const struct sysfs_ops brport_sysfs_ops = {
268 .show = brport_show,
269 .store = brport_store,
270};
271
272/*
273 * Add sysfs entries to ethernet device added to a bridge.
274 * Creates a brport subdirectory with bridge attributes.
275 * Puts symlink in bridge's brif subdirectory
276 */
277int br_sysfs_addif(struct net_bridge_port *p)
278{
279 struct net_bridge *br = p->br;
280 const struct brport_attribute **a;
281 int err;
282
283 err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
284 SYSFS_BRIDGE_PORT_LINK);
285 if (err)
286 return err;
287
288 for (a = brport_attrs; *a; ++a) {
289 err = sysfs_create_file(&p->kobj, &((*a)->attr));
290 if (err)
291 return err;
292 }
293
294 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
295 return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name);
296}
297
298/* Rename bridge's brif symlink */
299int br_sysfs_renameif(struct net_bridge_port *p)
300{
301 struct net_bridge *br = p->br;
302 int err;
303
304 /* If a rename fails, the rollback will cause another
305 * rename call with the existing name.
306 */
307 if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ))
308 return 0;
309
310 err = sysfs_rename_link(br->ifobj, &p->kobj,
311 p->sysfs_name, p->dev->name);
312 if (err)
313 netdev_notice(br->dev, "unable to rename link %s to %s",
314 p->sysfs_name, p->dev->name);
315 else
316 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
317
318 return err;
319}