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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/times.h>
21
22#include "br_private.h"
23
24#define to_dev(obj) container_of(obj, struct device, kobj)
25#define to_bridge(cd) ((struct net_bridge *)netdev_priv(to_net_dev(cd)))
26
27
28
29
30static ssize_t store_bridge_parm(struct device *d,
31 const char *buf, size_t len,
32 int (*set)(struct net_bridge *, unsigned long))
33{
34 struct net_bridge *br = to_bridge(d);
35 char *endp;
36 unsigned long val;
37 int err;
38
39 if (!capable(CAP_NET_ADMIN))
40 return -EPERM;
41
42 val = simple_strtoul(buf, &endp, 0);
43 if (endp == buf)
44 return -EINVAL;
45
46 spin_lock_bh(&br->lock);
47 err = (*set)(br, val);
48 spin_unlock_bh(&br->lock);
49 return err ? err : len;
50}
51
52
53static ssize_t show_forward_delay(struct device *d,
54 struct device_attribute *attr, char *buf)
55{
56 struct net_bridge *br = to_bridge(d);
57 return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay));
58}
59
60static int set_forward_delay(struct net_bridge *br, unsigned long val)
61{
62 unsigned long delay = clock_t_to_jiffies(val);
63 br->forward_delay = delay;
64 if (br_is_root_bridge(br))
65 br->bridge_forward_delay = delay;
66 return 0;
67}
68
69static ssize_t store_forward_delay(struct device *d,
70 struct device_attribute *attr,
71 const char *buf, size_t len)
72{
73 return store_bridge_parm(d, buf, len, set_forward_delay);
74}
75static DEVICE_ATTR(forward_delay, S_IRUGO | S_IWUSR,
76 show_forward_delay, store_forward_delay);
77
78static ssize_t show_hello_time(struct device *d, struct device_attribute *attr,
79 char *buf)
80{
81 return sprintf(buf, "%lu\n",
82 jiffies_to_clock_t(to_bridge(d)->hello_time));
83}
84
85static int set_hello_time(struct net_bridge *br, unsigned long val)
86{
87 unsigned long t = clock_t_to_jiffies(val);
88
89 if (t < HZ)
90 return -EINVAL;
91
92 br->hello_time = t;
93 if (br_is_root_bridge(br))
94 br->bridge_hello_time = t;
95 return 0;
96}
97
98static ssize_t store_hello_time(struct device *d,
99 struct device_attribute *attr, const char *buf,
100 size_t len)
101{
102 return store_bridge_parm(d, buf, len, set_hello_time);
103}
104static DEVICE_ATTR(hello_time, S_IRUGO | S_IWUSR, show_hello_time,
105 store_hello_time);
106
107static ssize_t show_max_age(struct device *d, struct device_attribute *attr,
108 char *buf)
109{
110 return sprintf(buf, "%lu\n",
111 jiffies_to_clock_t(to_bridge(d)->max_age));
112}
113
114static int set_max_age(struct net_bridge *br, unsigned long val)
115{
116 unsigned long t = clock_t_to_jiffies(val);
117 br->max_age = t;
118 if (br_is_root_bridge(br))
119 br->bridge_max_age = t;
120 return 0;
121}
122
123static ssize_t store_max_age(struct device *d, struct device_attribute *attr,
124 const char *buf, size_t len)
125{
126 return store_bridge_parm(d, buf, len, set_max_age);
127}
128static DEVICE_ATTR(max_age, S_IRUGO | S_IWUSR, show_max_age, store_max_age);
129
130static ssize_t show_ageing_time(struct device *d,
131 struct device_attribute *attr, char *buf)
132{
133 struct net_bridge *br = to_bridge(d);
134 return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time));
135}
136
137static int set_ageing_time(struct net_bridge *br, unsigned long val)
138{
139 br->ageing_time = clock_t_to_jiffies(val);
140 return 0;
141}
142
143static ssize_t store_ageing_time(struct device *d,
144 struct device_attribute *attr,
145 const char *buf, size_t len)
146{
147 return store_bridge_parm(d, buf, len, set_ageing_time);
148}
149static DEVICE_ATTR(ageing_time, S_IRUGO | S_IWUSR, show_ageing_time,
150 store_ageing_time);
151
152static ssize_t show_stp_state(struct device *d,
153 struct device_attribute *attr, char *buf)
154{
155 struct net_bridge *br = to_bridge(d);
156 return sprintf(buf, "%d\n", br->stp_enabled);
157}
158
159
160static ssize_t store_stp_state(struct device *d,
161 struct device_attribute *attr, const char *buf,
162 size_t len)
163{
164 struct net_bridge *br = to_bridge(d);
165 char *endp;
166 unsigned long val;
167
168 if (!capable(CAP_NET_ADMIN))
169 return -EPERM;
170
171 val = simple_strtoul(buf, &endp, 0);
172 if (endp == buf)
173 return -EINVAL;
174
175 if (!rtnl_trylock())
176 return restart_syscall();
177 br_stp_set_enabled(br, val);
178 rtnl_unlock();
179
180 return len;
181}
182static DEVICE_ATTR(stp_state, S_IRUGO | S_IWUSR, show_stp_state,
183 store_stp_state);
184
185static ssize_t show_priority(struct device *d, struct device_attribute *attr,
186 char *buf)
187{
188 struct net_bridge *br = to_bridge(d);
189 return sprintf(buf, "%d\n",
190 (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]);
191}
192
193static int set_priority(struct net_bridge *br, unsigned long val)
194{
195 br_stp_set_bridge_priority(br, (u16) val);
196 return 0;
197}
198
199static ssize_t store_priority(struct device *d, struct device_attribute *attr,
200 const char *buf, size_t len)
201{
202 return store_bridge_parm(d, buf, len, set_priority);
203}
204static DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, show_priority, store_priority);
205
206static ssize_t show_root_id(struct device *d, struct device_attribute *attr,
207 char *buf)
208{
209 return br_show_bridge_id(buf, &to_bridge(d)->designated_root);
210}
211static DEVICE_ATTR(root_id, S_IRUGO, show_root_id, NULL);
212
213static ssize_t show_bridge_id(struct device *d, struct device_attribute *attr,
214 char *buf)
215{
216 return br_show_bridge_id(buf, &to_bridge(d)->bridge_id);
217}
218static DEVICE_ATTR(bridge_id, S_IRUGO, show_bridge_id, NULL);
219
220static ssize_t show_root_port(struct device *d, struct device_attribute *attr,
221 char *buf)
222{
223 return sprintf(buf, "%d\n", to_bridge(d)->root_port);
224}
225static DEVICE_ATTR(root_port, S_IRUGO, show_root_port, NULL);
226
227static ssize_t show_root_path_cost(struct device *d,
228 struct device_attribute *attr, char *buf)
229{
230 return sprintf(buf, "%d\n", to_bridge(d)->root_path_cost);
231}
232static DEVICE_ATTR(root_path_cost, S_IRUGO, show_root_path_cost, NULL);
233
234static ssize_t show_topology_change(struct device *d,
235 struct device_attribute *attr, char *buf)
236{
237 return sprintf(buf, "%d\n", to_bridge(d)->topology_change);
238}
239static DEVICE_ATTR(topology_change, S_IRUGO, show_topology_change, NULL);
240
241static ssize_t show_topology_change_detected(struct device *d,
242 struct device_attribute *attr,
243 char *buf)
244{
245 struct net_bridge *br = to_bridge(d);
246 return sprintf(buf, "%d\n", br->topology_change_detected);
247}
248static DEVICE_ATTR(topology_change_detected, S_IRUGO,
249 show_topology_change_detected, NULL);
250
251static ssize_t show_hello_timer(struct device *d,
252 struct device_attribute *attr, char *buf)
253{
254 struct net_bridge *br = to_bridge(d);
255 return sprintf(buf, "%ld\n", br_timer_value(&br->hello_timer));
256}
257static DEVICE_ATTR(hello_timer, S_IRUGO, show_hello_timer, NULL);
258
259static ssize_t show_tcn_timer(struct device *d, struct device_attribute *attr,
260 char *buf)
261{
262 struct net_bridge *br = to_bridge(d);
263 return sprintf(buf, "%ld\n", br_timer_value(&br->tcn_timer));
264}
265static DEVICE_ATTR(tcn_timer, S_IRUGO, show_tcn_timer, NULL);
266
267static ssize_t show_topology_change_timer(struct device *d,
268 struct device_attribute *attr,
269 char *buf)
270{
271 struct net_bridge *br = to_bridge(d);
272 return sprintf(buf, "%ld\n", br_timer_value(&br->topology_change_timer));
273}
274static DEVICE_ATTR(topology_change_timer, S_IRUGO, show_topology_change_timer,
275 NULL);
276
277static ssize_t show_gc_timer(struct device *d, struct device_attribute *attr,
278 char *buf)
279{
280 struct net_bridge *br = to_bridge(d);
281 return sprintf(buf, "%ld\n", br_timer_value(&br->gc_timer));
282}
283static DEVICE_ATTR(gc_timer, S_IRUGO, show_gc_timer, NULL);
284
285static ssize_t show_group_addr(struct device *d,
286 struct device_attribute *attr, char *buf)
287{
288 struct net_bridge *br = to_bridge(d);
289 return sprintf(buf, "%x:%x:%x:%x:%x:%x\n",
290 br->group_addr[0], br->group_addr[1],
291 br->group_addr[2], br->group_addr[3],
292 br->group_addr[4], br->group_addr[5]);
293}
294
295static ssize_t store_group_addr(struct device *d,
296 struct device_attribute *attr,
297 const char *buf, size_t len)
298{
299 struct net_bridge *br = to_bridge(d);
300 unsigned new_addr[6];
301 int i;
302
303 if (!capable(CAP_NET_ADMIN))
304 return -EPERM;
305
306 if (sscanf(buf, "%x:%x:%x:%x:%x:%x",
307 &new_addr[0], &new_addr[1], &new_addr[2],
308 &new_addr[3], &new_addr[4], &new_addr[5]) != 6)
309 return -EINVAL;
310
311
312 for (i = 0; i < 5; i++)
313 if (new_addr[i] != br_group_address[i])
314 return -EINVAL;
315
316 if (new_addr[5] & ~0xf)
317 return -EINVAL;
318
319 if (new_addr[5] == 1
320 || new_addr[5] == 2
321 || new_addr[5] == 3)
322 return -EINVAL;
323
324 spin_lock_bh(&br->lock);
325 for (i = 0; i < 6; i++)
326 br->group_addr[i] = new_addr[i];
327 spin_unlock_bh(&br->lock);
328 return len;
329}
330
331static DEVICE_ATTR(group_addr, S_IRUGO | S_IWUSR,
332 show_group_addr, store_group_addr);
333
334static ssize_t store_flush(struct device *d,
335 struct device_attribute *attr,
336 const char *buf, size_t len)
337{
338 struct net_bridge *br = to_bridge(d);
339
340 if (!capable(CAP_NET_ADMIN))
341 return -EPERM;
342
343 br_fdb_flush(br);
344 return len;
345}
346static DEVICE_ATTR(flush, S_IWUSR, NULL, store_flush);
347
348static struct attribute *bridge_attrs[] = {
349 &dev_attr_forward_delay.attr,
350 &dev_attr_hello_time.attr,
351 &dev_attr_max_age.attr,
352 &dev_attr_ageing_time.attr,
353 &dev_attr_stp_state.attr,
354 &dev_attr_priority.attr,
355 &dev_attr_bridge_id.attr,
356 &dev_attr_root_id.attr,
357 &dev_attr_root_path_cost.attr,
358 &dev_attr_root_port.attr,
359 &dev_attr_topology_change.attr,
360 &dev_attr_topology_change_detected.attr,
361 &dev_attr_hello_timer.attr,
362 &dev_attr_tcn_timer.attr,
363 &dev_attr_topology_change_timer.attr,
364 &dev_attr_gc_timer.attr,
365 &dev_attr_group_addr.attr,
366 &dev_attr_flush.attr,
367 NULL
368};
369
370static struct attribute_group bridge_group = {
371 .name = SYSFS_BRIDGE_ATTR,
372 .attrs = bridge_attrs,
373};
374
375
376
377
378
379
380
381static ssize_t brforward_read(struct kobject *kobj,
382 struct bin_attribute *bin_attr,
383 char *buf, loff_t off, size_t count)
384{
385 struct device *dev = to_dev(kobj);
386 struct net_bridge *br = to_bridge(dev);
387 int n;
388
389
390 if (off % sizeof(struct __fdb_entry) != 0)
391 return -EINVAL;
392
393 n = br_fdb_fillbuf(br, buf,
394 count / sizeof(struct __fdb_entry),
395 off / sizeof(struct __fdb_entry));
396
397 if (n > 0)
398 n *= sizeof(struct __fdb_entry);
399
400 return n;
401}
402
403static struct bin_attribute bridge_forward = {
404 .attr = { .name = SYSFS_BRIDGE_FDB,
405 .mode = S_IRUGO, },
406 .read = brforward_read,
407};
408
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418
419
420int br_sysfs_addbr(struct net_device *dev)
421{
422 struct kobject *brobj = &dev->dev.kobj;
423 struct net_bridge *br = netdev_priv(dev);
424 int err;
425
426 err = sysfs_create_group(brobj, &bridge_group);
427 if (err) {
428 pr_info("%s: can't create group %s/%s\n",
429 __func__, dev->name, bridge_group.name);
430 goto out1;
431 }
432
433 err = sysfs_create_bin_file(brobj, &bridge_forward);
434 if (err) {
435 pr_info("%s: can't create attribute file %s/%s\n",
436 __func__, dev->name, bridge_forward.attr.name);
437 goto out2;
438 }
439
440 br->ifobj = kobject_create_and_add(SYSFS_BRIDGE_PORT_SUBDIR, brobj);
441 if (!br->ifobj) {
442 pr_info("%s: can't add kobject (directory) %s/%s\n",
443 __func__, dev->name, SYSFS_BRIDGE_PORT_SUBDIR);
444 goto out3;
445 }
446 return 0;
447 out3:
448 sysfs_remove_bin_file(&dev->dev.kobj, &bridge_forward);
449 out2:
450 sysfs_remove_group(&dev->dev.kobj, &bridge_group);
451 out1:
452 return err;
453
454}
455
456void br_sysfs_delbr(struct net_device *dev)
457{
458 struct kobject *kobj = &dev->dev.kobj;
459 struct net_bridge *br = netdev_priv(dev);
460
461 kobject_put(br->ifobj);
462 sysfs_remove_bin_file(kobj, &bridge_forward);
463 sysfs_remove_group(kobj, &bridge_group);
464}
465
