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