bridge: add sysfs hook to flush forwarding table
[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 *)(to_net_dev(cd)->priv))
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                                  void (*set)(struct net_bridge *, unsigned long))
33 {
34         struct net_bridge *br = to_bridge(d);
35         char *endp;
36         unsigned long val;
37
38         if (!capable(CAP_NET_ADMIN))
39                 return -EPERM;
40
41         val = simple_strtoul(buf, &endp, 0);
42         if (endp == buf)
43                 return -EINVAL;
44
45         spin_lock_bh(&br->lock);
46         (*set)(br, val);
47         spin_unlock_bh(&br->lock);
48         return len;
49 }
50
51
52 static ssize_t show_forward_delay(struct device *d,
53                                   struct device_attribute *attr, char *buf)
54 {
55         struct net_bridge *br = to_bridge(d);
56         return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay));
57 }
58
59 static void set_forward_delay(struct net_bridge *br, unsigned long val)
60 {
61         unsigned long delay = clock_t_to_jiffies(val);
62         br->forward_delay = delay;
63         if (br_is_root_bridge(br))
64                 br->bridge_forward_delay = delay;
65 }
66
67 static ssize_t store_forward_delay(struct device *d,
68                                    struct device_attribute *attr,
69                                    const char *buf, size_t len)
70 {
71         return store_bridge_parm(d, buf, len, set_forward_delay);
72 }
73 static DEVICE_ATTR(forward_delay, S_IRUGO | S_IWUSR,
74                    show_forward_delay, store_forward_delay);
75
76 static ssize_t show_hello_time(struct device *d, struct device_attribute *attr,
77                                char *buf)
78 {
79         return sprintf(buf, "%lu\n",
80                        jiffies_to_clock_t(to_bridge(d)->hello_time));
81 }
82
83 static void set_hello_time(struct net_bridge *br, unsigned long val)
84 {
85         unsigned long t = clock_t_to_jiffies(val);
86         br->hello_time = t;
87         if (br_is_root_bridge(br))
88                 br->bridge_hello_time = t;
89 }
90
91 static ssize_t store_hello_time(struct device *d,
92                                 struct device_attribute *attr, const char *buf,
93                                 size_t len)
94 {
95         return store_bridge_parm(d, buf, len, set_hello_time);
96 }
97 static DEVICE_ATTR(hello_time, S_IRUGO | S_IWUSR, show_hello_time,
98                    store_hello_time);
99
100 static ssize_t show_max_age(struct device *d, struct device_attribute *attr,
101                             char *buf)
102 {
103         return sprintf(buf, "%lu\n",
104                        jiffies_to_clock_t(to_bridge(d)->max_age));
105 }
106
107 static void set_max_age(struct net_bridge *br, unsigned long val)
108 {
109         unsigned long t = clock_t_to_jiffies(val);
110         br->max_age = t;
111         if (br_is_root_bridge(br))
112                 br->bridge_max_age = t;
113 }
114
115 static ssize_t store_max_age(struct device *d, struct device_attribute *attr,
116                              const char *buf, size_t len)
117 {
118         return store_bridge_parm(d, buf, len, set_max_age);
119 }
120 static DEVICE_ATTR(max_age, S_IRUGO | S_IWUSR, show_max_age, store_max_age);
121
122 static ssize_t show_ageing_time(struct device *d,
123                                 struct device_attribute *attr, char *buf)
124 {
125         struct net_bridge *br = to_bridge(d);
126         return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time));
127 }
128
129 static void set_ageing_time(struct net_bridge *br, unsigned long val)
130 {
131         br->ageing_time = clock_t_to_jiffies(val);
132 }
133
134 static ssize_t store_ageing_time(struct device *d,
135                                  struct device_attribute *attr,
136                                  const char *buf, size_t len)
137 {
138         return store_bridge_parm(d, buf, len, set_ageing_time);
139 }
140 static DEVICE_ATTR(ageing_time, S_IRUGO | S_IWUSR, show_ageing_time,
141                    store_ageing_time);
142
143 static ssize_t show_stp_state(struct device *d,
144                               struct device_attribute *attr, char *buf)
145 {
146         struct net_bridge *br = to_bridge(d);
147         return sprintf(buf, "%d\n", br->stp_enabled);
148 }
149
150 static void set_stp_state(struct net_bridge *br, unsigned long val)
151 {
152         br->stp_enabled = val;
153 }
154
155 static ssize_t store_stp_state(struct device *d,
156                                struct device_attribute *attr, const char *buf,
157                                size_t len)
158 {
159         return store_bridge_parm(d, buf, len, set_stp_state);
160 }
161 static DEVICE_ATTR(stp_state, S_IRUGO | S_IWUSR, show_stp_state,
162                    store_stp_state);
163
164 static ssize_t show_priority(struct device *d, struct device_attribute *attr,
165                              char *buf)
166 {
167         struct net_bridge *br = to_bridge(d);
168         return sprintf(buf, "%d\n",
169                        (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]);
170 }
171
172 static void set_priority(struct net_bridge *br, unsigned long val)
173 {
174         br_stp_set_bridge_priority(br, (u16) val);
175 }
176
177 static ssize_t store_priority(struct device *d, struct device_attribute *attr,
178                                const char *buf, size_t len)
179 {
180         return store_bridge_parm(d, buf, len, set_priority);
181 }
182 static DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, show_priority, store_priority);
183
184 static ssize_t show_root_id(struct device *d, struct device_attribute *attr,
185                             char *buf)
186 {
187         return br_show_bridge_id(buf, &to_bridge(d)->designated_root);
188 }
189 static DEVICE_ATTR(root_id, S_IRUGO, show_root_id, NULL);
190
191 static ssize_t show_bridge_id(struct device *d, struct device_attribute *attr,
192                               char *buf)
193 {
194         return br_show_bridge_id(buf, &to_bridge(d)->bridge_id);
195 }
196 static DEVICE_ATTR(bridge_id, S_IRUGO, show_bridge_id, NULL);
197
198 static ssize_t show_root_port(struct device *d, struct device_attribute *attr,
199                               char *buf)
200 {
201         return sprintf(buf, "%d\n", to_bridge(d)->root_port);
202 }
203 static DEVICE_ATTR(root_port, S_IRUGO, show_root_port, NULL);
204
205 static ssize_t show_root_path_cost(struct device *d,
206                                    struct device_attribute *attr, char *buf)
207 {
208         return sprintf(buf, "%d\n", to_bridge(d)->root_path_cost);
209 }
210 static DEVICE_ATTR(root_path_cost, S_IRUGO, show_root_path_cost, NULL);
211
212 static ssize_t show_topology_change(struct device *d,
213                                     struct device_attribute *attr, char *buf)
214 {
215         return sprintf(buf, "%d\n", to_bridge(d)->topology_change);
216 }
217 static DEVICE_ATTR(topology_change, S_IRUGO, show_topology_change, NULL);
218
219 static ssize_t show_topology_change_detected(struct device *d,
220                                              struct device_attribute *attr,
221                                              char *buf)
222 {
223         struct net_bridge *br = to_bridge(d);
224         return sprintf(buf, "%d\n", br->topology_change_detected);
225 }
226 static DEVICE_ATTR(topology_change_detected, S_IRUGO,
227                    show_topology_change_detected, NULL);
228
229 static ssize_t show_hello_timer(struct device *d,
230                                 struct device_attribute *attr, char *buf)
231 {
232         struct net_bridge *br = to_bridge(d);
233         return sprintf(buf, "%ld\n", br_timer_value(&br->hello_timer));
234 }
235 static DEVICE_ATTR(hello_timer, S_IRUGO, show_hello_timer, NULL);
236
237 static ssize_t show_tcn_timer(struct device *d, struct device_attribute *attr,
238                               char *buf)
239 {
240         struct net_bridge *br = to_bridge(d);
241         return sprintf(buf, "%ld\n", br_timer_value(&br->tcn_timer));
242 }
243 static DEVICE_ATTR(tcn_timer, S_IRUGO, show_tcn_timer, NULL);
244
245 static ssize_t show_topology_change_timer(struct device *d,
246                                           struct device_attribute *attr,
247                                           char *buf)
248 {
249         struct net_bridge *br = to_bridge(d);
250         return sprintf(buf, "%ld\n", br_timer_value(&br->topology_change_timer));
251 }
252 static DEVICE_ATTR(topology_change_timer, S_IRUGO, show_topology_change_timer,
253                    NULL);
254
255 static ssize_t show_gc_timer(struct device *d, struct device_attribute *attr,
256                              char *buf)
257 {
258         struct net_bridge *br = to_bridge(d);
259         return sprintf(buf, "%ld\n", br_timer_value(&br->gc_timer));
260 }
261 static DEVICE_ATTR(gc_timer, S_IRUGO, show_gc_timer, NULL);
262
263 static ssize_t show_group_addr(struct device *d,
264                                struct device_attribute *attr, char *buf)
265 {
266         struct net_bridge *br = to_bridge(d);
267         return sprintf(buf, "%x:%x:%x:%x:%x:%x\n",
268                        br->group_addr[0], br->group_addr[1],
269                        br->group_addr[2], br->group_addr[3],
270                        br->group_addr[4], br->group_addr[5]);
271 }
272
273 static ssize_t store_group_addr(struct device *d,
274                                 struct device_attribute *attr,
275                                 const char *buf, size_t len)
276 {
277         struct net_bridge *br = to_bridge(d);
278         unsigned new_addr[6];
279         int i;
280
281         if (!capable(CAP_NET_ADMIN))
282                 return -EPERM;
283
284         if (sscanf(buf, "%x:%x:%x:%x:%x:%x",
285                    &new_addr[0], &new_addr[1], &new_addr[2],
286                    &new_addr[3], &new_addr[4], &new_addr[5]) != 6)
287                 return -EINVAL;
288
289         /* Must be 01:80:c2:00:00:0X */
290         for (i = 0; i < 5; i++)
291                 if (new_addr[i] != br_group_address[i])
292                         return -EINVAL;
293
294         if (new_addr[5] & ~0xf)
295                 return -EINVAL;
296
297         if (new_addr[5] == 1    /* 802.3x Pause address */
298             || new_addr[5] == 2 /* 802.3ad Slow protocols */
299             || new_addr[5] == 3) /* 802.1X PAE address */
300                 return -EINVAL;
301
302         spin_lock_bh(&br->lock);
303         for (i = 0; i < 6; i++)
304                 br->group_addr[i] = new_addr[i];
305         spin_unlock_bh(&br->lock);
306         return len;
307 }
308
309 static DEVICE_ATTR(group_addr, S_IRUGO | S_IWUSR,
310                    show_group_addr, store_group_addr);
311
312 static ssize_t store_flush(struct device *d,
313                            struct device_attribute *attr,
314                            const char *buf, size_t len)
315 {
316         struct net_bridge *br = to_bridge(d);
317
318         if (!capable(CAP_NET_ADMIN))
319                 return -EPERM;
320
321         br_fdb_flush(br);
322         return len;
323 }
324 static DEVICE_ATTR(flush, S_IWUSR, NULL, store_flush);
325
326 static struct attribute *bridge_attrs[] = {
327         &dev_attr_forward_delay.attr,
328         &dev_attr_hello_time.attr,
329         &dev_attr_max_age.attr,
330         &dev_attr_ageing_time.attr,
331         &dev_attr_stp_state.attr,
332         &dev_attr_priority.attr,
333         &dev_attr_bridge_id.attr,
334         &dev_attr_root_id.attr,
335         &dev_attr_root_path_cost.attr,
336         &dev_attr_root_port.attr,
337         &dev_attr_topology_change.attr,
338         &dev_attr_topology_change_detected.attr,
339         &dev_attr_hello_timer.attr,
340         &dev_attr_tcn_timer.attr,
341         &dev_attr_topology_change_timer.attr,
342         &dev_attr_gc_timer.attr,
343         &dev_attr_group_addr.attr,
344         &dev_attr_flush.attr,
345         NULL
346 };
347
348 static struct attribute_group bridge_group = {
349         .name = SYSFS_BRIDGE_ATTR,
350         .attrs = bridge_attrs,
351 };
352
353 /*
354  * Export the forwarding information table as a binary file
355  * The records are struct __fdb_entry.
356  *
357  * Returns the number of bytes read.
358  */
359 static ssize_t brforward_read(struct kobject *kobj, char *buf,
360                            loff_t off, size_t count)
361 {
362         struct device *dev = to_dev(kobj);
363         struct net_bridge *br = to_bridge(dev);
364         int n;
365
366         /* must read whole records */
367         if (off % sizeof(struct __fdb_entry) != 0)
368                 return -EINVAL;
369
370         n =  br_fdb_fillbuf(br, buf,
371                             count / sizeof(struct __fdb_entry),
372                             off / sizeof(struct __fdb_entry));
373
374         if (n > 0)
375                 n *= sizeof(struct __fdb_entry);
376
377         return n;
378 }
379
380 static struct bin_attribute bridge_forward = {
381         .attr = { .name = SYSFS_BRIDGE_FDB,
382                   .mode = S_IRUGO,
383                   .owner = THIS_MODULE, },
384         .read = brforward_read,
385 };
386
387 /*
388  * Add entries in sysfs onto the existing network class device
389  * for the bridge.
390  *   Adds a attribute group "bridge" containing tuning parameters.
391  *   Binary attribute containing the forward table
392  *   Sub directory to hold links to interfaces.
393  *
394  * Note: the ifobj exists only to be a subdirectory
395  *   to hold links.  The ifobj exists in same data structure
396  *   as it's parent the bridge so reference counting works.
397  */
398 int br_sysfs_addbr(struct net_device *dev)
399 {
400         struct kobject *brobj = &dev->dev.kobj;
401         struct net_bridge *br = netdev_priv(dev);
402         int err;
403
404         err = sysfs_create_group(brobj, &bridge_group);
405         if (err) {
406                 pr_info("%s: can't create group %s/%s\n",
407                         __FUNCTION__, dev->name, bridge_group.name);
408                 goto out1;
409         }
410
411         err = sysfs_create_bin_file(brobj, &bridge_forward);
412         if (err) {
413                 pr_info("%s: can't create attribute file %s/%s\n",
414                         __FUNCTION__, dev->name, bridge_forward.attr.name);
415                 goto out2;
416         }
417
418
419         kobject_set_name(&br->ifobj, SYSFS_BRIDGE_PORT_SUBDIR);
420         br->ifobj.ktype = NULL;
421         br->ifobj.kset = NULL;
422         br->ifobj.parent = brobj;
423
424         err = kobject_register(&br->ifobj);
425         if (err) {
426                 pr_info("%s: can't add kobject (directory) %s/%s\n",
427                         __FUNCTION__, dev->name, br->ifobj.name);
428                 goto out3;
429         }
430         return 0;
431  out3:
432         sysfs_remove_bin_file(&dev->dev.kobj, &bridge_forward);
433  out2:
434         sysfs_remove_group(&dev->dev.kobj, &bridge_group);
435  out1:
436         return err;
437
438 }
439
440 void br_sysfs_delbr(struct net_device *dev)
441 {
442         struct kobject *kobj = &dev->dev.kobj;
443         struct net_bridge *br = netdev_priv(dev);
444
445         kobject_unregister(&br->ifobj);
446         sysfs_remove_bin_file(kobj, &bridge_forward);
447         sysfs_remove_group(kobj, &bridge_group);
448 }