bridge: Add multicast_router sysfs entries
[linux-2.6.git] / net / bridge / br_sysfs_br.c
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/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  * Common code for storing bridge parameters.
29  */
30 static 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
53 static 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
60 static 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
69 static 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 }
75 static DEVICE_ATTR(forward_delay, S_IRUGO | S_IWUSR,
76                    show_forward_delay, store_forward_delay);
77
78 static 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
85 static 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
98 static 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 }
104 static DEVICE_ATTR(hello_time, S_IRUGO | S_IWUSR, show_hello_time,
105                    store_hello_time);
106
107 static 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
114 static 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
123 static 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 }
128 static DEVICE_ATTR(max_age, S_IRUGO | S_IWUSR, show_max_age, store_max_age);
129
130 static 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
137 static 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
143 static 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 }
149 static DEVICE_ATTR(ageing_time, S_IRUGO | S_IWUSR, show_ageing_time,
150                    store_ageing_time);
151
152 static 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
160 static 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 }
182 static DEVICE_ATTR(stp_state, S_IRUGO | S_IWUSR, show_stp_state,
183                    store_stp_state);
184
185 static 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
193 static 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
199 static 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 }
204 static DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, show_priority, store_priority);
205
206 static 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 }
211 static DEVICE_ATTR(root_id, S_IRUGO, show_root_id, NULL);
212
213 static 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 }
218 static DEVICE_ATTR(bridge_id, S_IRUGO, show_bridge_id, NULL);
219
220 static 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 }
225 static DEVICE_ATTR(root_port, S_IRUGO, show_root_port, NULL);
226
227 static 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 }
232 static DEVICE_ATTR(root_path_cost, S_IRUGO, show_root_path_cost, NULL);
233
234 static 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 }
239 static DEVICE_ATTR(topology_change, S_IRUGO, show_topology_change, NULL);
240
241 static 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 }
248 static DEVICE_ATTR(topology_change_detected, S_IRUGO,
249                    show_topology_change_detected, NULL);
250
251 static 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 }
257 static DEVICE_ATTR(hello_timer, S_IRUGO, show_hello_timer, NULL);
258
259 static 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 }
265 static DEVICE_ATTR(tcn_timer, S_IRUGO, show_tcn_timer, NULL);
266
267 static 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 }
274 static DEVICE_ATTR(topology_change_timer, S_IRUGO, show_topology_change_timer,
275                    NULL);
276
277 static 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 }
283 static DEVICE_ATTR(gc_timer, S_IRUGO, show_gc_timer, NULL);
284
285 static 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
295 static 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         /* Must be 01:80:c2:00:00:0X */
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 ||         /* 802.3x Pause address */
320             new_addr[5] == 2 ||         /* 802.3ad Slow protocols */
321             new_addr[5] == 3)           /* 802.1X PAE address */
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
331 static DEVICE_ATTR(group_addr, S_IRUGO | S_IWUSR,
332                    show_group_addr, store_group_addr);
333
334 static 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 }
346 static DEVICE_ATTR(flush, S_IWUSR, NULL, store_flush);
347
348 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
349 static ssize_t show_multicast_router(struct device *d,
350                                      struct device_attribute *attr, char *buf)
351 {
352         struct net_bridge *br = to_bridge(d);
353         return sprintf(buf, "%d\n", br->multicast_router);
354 }
355
356 static ssize_t store_multicast_router(struct device *d,
357                                       struct device_attribute *attr,
358                                       const char *buf, size_t len)
359 {
360         return store_bridge_parm(d, buf, len, br_multicast_set_router);
361 }
362 static DEVICE_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router,
363                    store_multicast_router);
364 #endif
365
366 static struct attribute *bridge_attrs[] = {
367         &dev_attr_forward_delay.attr,
368         &dev_attr_hello_time.attr,
369         &dev_attr_max_age.attr,
370         &dev_attr_ageing_time.attr,
371         &dev_attr_stp_state.attr,
372         &dev_attr_priority.attr,
373         &dev_attr_bridge_id.attr,
374         &dev_attr_root_id.attr,
375         &dev_attr_root_path_cost.attr,
376         &dev_attr_root_port.attr,
377         &dev_attr_topology_change.attr,
378         &dev_attr_topology_change_detected.attr,
379         &dev_attr_hello_timer.attr,
380         &dev_attr_tcn_timer.attr,
381         &dev_attr_topology_change_timer.attr,
382         &dev_attr_gc_timer.attr,
383         &dev_attr_group_addr.attr,
384         &dev_attr_flush.attr,
385 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
386         &dev_attr_multicast_router.attr,
387 #endif
388         NULL
389 };
390
391 static struct attribute_group bridge_group = {
392         .name = SYSFS_BRIDGE_ATTR,
393         .attrs = bridge_attrs,
394 };
395
396 /*
397  * Export the forwarding information table as a binary file
398  * The records are struct __fdb_entry.
399  *
400  * Returns the number of bytes read.
401  */
402 static ssize_t brforward_read(struct kobject *kobj,
403                               struct bin_attribute *bin_attr,
404                               char *buf, loff_t off, size_t count)
405 {
406         struct device *dev = to_dev(kobj);
407         struct net_bridge *br = to_bridge(dev);
408         int n;
409
410         /* must read whole records */
411         if (off % sizeof(struct __fdb_entry) != 0)
412                 return -EINVAL;
413
414         n =  br_fdb_fillbuf(br, buf,
415                             count / sizeof(struct __fdb_entry),
416                             off / sizeof(struct __fdb_entry));
417
418         if (n > 0)
419                 n *= sizeof(struct __fdb_entry);
420
421         return n;
422 }
423
424 static struct bin_attribute bridge_forward = {
425         .attr = { .name = SYSFS_BRIDGE_FDB,
426                   .mode = S_IRUGO, },
427         .read = brforward_read,
428 };
429
430 /*
431  * Add entries in sysfs onto the existing network class device
432  * for the bridge.
433  *   Adds a attribute group "bridge" containing tuning parameters.
434  *   Binary attribute containing the forward table
435  *   Sub directory to hold links to interfaces.
436  *
437  * Note: the ifobj exists only to be a subdirectory
438  *   to hold links.  The ifobj exists in same data structure
439  *   as it's parent the bridge so reference counting works.
440  */
441 int br_sysfs_addbr(struct net_device *dev)
442 {
443         struct kobject *brobj = &dev->dev.kobj;
444         struct net_bridge *br = netdev_priv(dev);
445         int err;
446
447         err = sysfs_create_group(brobj, &bridge_group);
448         if (err) {
449                 pr_info("%s: can't create group %s/%s\n",
450                         __func__, dev->name, bridge_group.name);
451                 goto out1;
452         }
453
454         err = sysfs_create_bin_file(brobj, &bridge_forward);
455         if (err) {
456                 pr_info("%s: can't create attribute file %s/%s\n",
457                         __func__, dev->name, bridge_forward.attr.name);
458                 goto out2;
459         }
460
461         br->ifobj = kobject_create_and_add(SYSFS_BRIDGE_PORT_SUBDIR, brobj);
462         if (!br->ifobj) {
463                 pr_info("%s: can't add kobject (directory) %s/%s\n",
464                         __func__, dev->name, SYSFS_BRIDGE_PORT_SUBDIR);
465                 goto out3;
466         }
467         return 0;
468  out3:
469         sysfs_remove_bin_file(&dev->dev.kobj, &bridge_forward);
470  out2:
471         sysfs_remove_group(&dev->dev.kobj, &bridge_group);
472  out1:
473         return err;
474
475 }
476
477 void br_sysfs_delbr(struct net_device *dev)
478 {
479         struct kobject *kobj = &dev->dev.kobj;
480         struct net_bridge *br = netdev_priv(dev);
481
482         kobject_put(br->ifobj);
483         sysfs_remove_bin_file(kobj, &bridge_forward);
484         sysfs_remove_group(kobj, &bridge_group);
485 }