netfilter: implement hotdrop for Ebtables
[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                                  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         rtnl_lock();
176         br_stp_set_enabled(br, val);
177         rtnl_unlock();
178
179         return len;
180 }
181 static DEVICE_ATTR(stp_state, S_IRUGO | S_IWUSR, show_stp_state,
182                    store_stp_state);
183
184 static ssize_t show_priority(struct device *d, struct device_attribute *attr,
185                              char *buf)
186 {
187         struct net_bridge *br = to_bridge(d);
188         return sprintf(buf, "%d\n",
189                        (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]);
190 }
191
192 static int set_priority(struct net_bridge *br, unsigned long val)
193 {
194         br_stp_set_bridge_priority(br, (u16) val);
195         return 0;
196 }
197
198 static ssize_t store_priority(struct device *d, struct device_attribute *attr,
199                                const char *buf, size_t len)
200 {
201         return store_bridge_parm(d, buf, len, set_priority);
202 }
203 static DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, show_priority, store_priority);
204
205 static ssize_t show_root_id(struct device *d, struct device_attribute *attr,
206                             char *buf)
207 {
208         return br_show_bridge_id(buf, &to_bridge(d)->designated_root);
209 }
210 static DEVICE_ATTR(root_id, S_IRUGO, show_root_id, NULL);
211
212 static ssize_t show_bridge_id(struct device *d, struct device_attribute *attr,
213                               char *buf)
214 {
215         return br_show_bridge_id(buf, &to_bridge(d)->bridge_id);
216 }
217 static DEVICE_ATTR(bridge_id, S_IRUGO, show_bridge_id, NULL);
218
219 static ssize_t show_root_port(struct device *d, struct device_attribute *attr,
220                               char *buf)
221 {
222         return sprintf(buf, "%d\n", to_bridge(d)->root_port);
223 }
224 static DEVICE_ATTR(root_port, S_IRUGO, show_root_port, NULL);
225
226 static ssize_t show_root_path_cost(struct device *d,
227                                    struct device_attribute *attr, char *buf)
228 {
229         return sprintf(buf, "%d\n", to_bridge(d)->root_path_cost);
230 }
231 static DEVICE_ATTR(root_path_cost, S_IRUGO, show_root_path_cost, NULL);
232
233 static ssize_t show_topology_change(struct device *d,
234                                     struct device_attribute *attr, char *buf)
235 {
236         return sprintf(buf, "%d\n", to_bridge(d)->topology_change);
237 }
238 static DEVICE_ATTR(topology_change, S_IRUGO, show_topology_change, NULL);
239
240 static ssize_t show_topology_change_detected(struct device *d,
241                                              struct device_attribute *attr,
242                                              char *buf)
243 {
244         struct net_bridge *br = to_bridge(d);
245         return sprintf(buf, "%d\n", br->topology_change_detected);
246 }
247 static DEVICE_ATTR(topology_change_detected, S_IRUGO,
248                    show_topology_change_detected, NULL);
249
250 static ssize_t show_hello_timer(struct device *d,
251                                 struct device_attribute *attr, char *buf)
252 {
253         struct net_bridge *br = to_bridge(d);
254         return sprintf(buf, "%ld\n", br_timer_value(&br->hello_timer));
255 }
256 static DEVICE_ATTR(hello_timer, S_IRUGO, show_hello_timer, NULL);
257
258 static ssize_t show_tcn_timer(struct device *d, struct device_attribute *attr,
259                               char *buf)
260 {
261         struct net_bridge *br = to_bridge(d);
262         return sprintf(buf, "%ld\n", br_timer_value(&br->tcn_timer));
263 }
264 static DEVICE_ATTR(tcn_timer, S_IRUGO, show_tcn_timer, NULL);
265
266 static ssize_t show_topology_change_timer(struct device *d,
267                                           struct device_attribute *attr,
268                                           char *buf)
269 {
270         struct net_bridge *br = to_bridge(d);
271         return sprintf(buf, "%ld\n", br_timer_value(&br->topology_change_timer));
272 }
273 static DEVICE_ATTR(topology_change_timer, S_IRUGO, show_topology_change_timer,
274                    NULL);
275
276 static ssize_t show_gc_timer(struct device *d, struct device_attribute *attr,
277                              char *buf)
278 {
279         struct net_bridge *br = to_bridge(d);
280         return sprintf(buf, "%ld\n", br_timer_value(&br->gc_timer));
281 }
282 static DEVICE_ATTR(gc_timer, S_IRUGO, show_gc_timer, NULL);
283
284 static ssize_t show_group_addr(struct device *d,
285                                struct device_attribute *attr, char *buf)
286 {
287         struct net_bridge *br = to_bridge(d);
288         return sprintf(buf, "%x:%x:%x:%x:%x:%x\n",
289                        br->group_addr[0], br->group_addr[1],
290                        br->group_addr[2], br->group_addr[3],
291                        br->group_addr[4], br->group_addr[5]);
292 }
293
294 static ssize_t store_group_addr(struct device *d,
295                                 struct device_attribute *attr,
296                                 const char *buf, size_t len)
297 {
298         struct net_bridge *br = to_bridge(d);
299         unsigned new_addr[6];
300         int i;
301
302         if (!capable(CAP_NET_ADMIN))
303                 return -EPERM;
304
305         if (sscanf(buf, "%x:%x:%x:%x:%x:%x",
306                    &new_addr[0], &new_addr[1], &new_addr[2],
307                    &new_addr[3], &new_addr[4], &new_addr[5]) != 6)
308                 return -EINVAL;
309
310         /* Must be 01:80:c2:00:00:0X */
311         for (i = 0; i < 5; i++)
312                 if (new_addr[i] != br_group_address[i])
313                         return -EINVAL;
314
315         if (new_addr[5] & ~0xf)
316                 return -EINVAL;
317
318         if (new_addr[5] == 1    /* 802.3x Pause address */
319             || new_addr[5] == 2 /* 802.3ad Slow protocols */
320             || new_addr[5] == 3) /* 802.1X PAE address */
321                 return -EINVAL;
322
323         spin_lock_bh(&br->lock);
324         for (i = 0; i < 6; i++)
325                 br->group_addr[i] = new_addr[i];
326         spin_unlock_bh(&br->lock);
327         return len;
328 }
329
330 static DEVICE_ATTR(group_addr, S_IRUGO | S_IWUSR,
331                    show_group_addr, store_group_addr);
332
333 static ssize_t store_flush(struct device *d,
334                            struct device_attribute *attr,
335                            const char *buf, size_t len)
336 {
337         struct net_bridge *br = to_bridge(d);
338
339         if (!capable(CAP_NET_ADMIN))
340                 return -EPERM;
341
342         br_fdb_flush(br);
343         return len;
344 }
345 static DEVICE_ATTR(flush, S_IWUSR, NULL, store_flush);
346
347 static struct attribute *bridge_attrs[] = {
348         &dev_attr_forward_delay.attr,
349         &dev_attr_hello_time.attr,
350         &dev_attr_max_age.attr,
351         &dev_attr_ageing_time.attr,
352         &dev_attr_stp_state.attr,
353         &dev_attr_priority.attr,
354         &dev_attr_bridge_id.attr,
355         &dev_attr_root_id.attr,
356         &dev_attr_root_path_cost.attr,
357         &dev_attr_root_port.attr,
358         &dev_attr_topology_change.attr,
359         &dev_attr_topology_change_detected.attr,
360         &dev_attr_hello_timer.attr,
361         &dev_attr_tcn_timer.attr,
362         &dev_attr_topology_change_timer.attr,
363         &dev_attr_gc_timer.attr,
364         &dev_attr_group_addr.attr,
365         &dev_attr_flush.attr,
366         NULL
367 };
368
369 static struct attribute_group bridge_group = {
370         .name = SYSFS_BRIDGE_ATTR,
371         .attrs = bridge_attrs,
372 };
373
374 /*
375  * Export the forwarding information table as a binary file
376  * The records are struct __fdb_entry.
377  *
378  * Returns the number of bytes read.
379  */
380 static ssize_t brforward_read(struct kobject *kobj,
381                               struct bin_attribute *bin_attr,
382                               char *buf, loff_t off, size_t count)
383 {
384         struct device *dev = to_dev(kobj);
385         struct net_bridge *br = to_bridge(dev);
386         int n;
387
388         /* must read whole records */
389         if (off % sizeof(struct __fdb_entry) != 0)
390                 return -EINVAL;
391
392         n =  br_fdb_fillbuf(br, buf,
393                             count / sizeof(struct __fdb_entry),
394                             off / sizeof(struct __fdb_entry));
395
396         if (n > 0)
397                 n *= sizeof(struct __fdb_entry);
398
399         return n;
400 }
401
402 static struct bin_attribute bridge_forward = {
403         .attr = { .name = SYSFS_BRIDGE_FDB,
404                   .mode = S_IRUGO, },
405         .read = brforward_read,
406 };
407
408 /*
409  * Add entries in sysfs onto the existing network class device
410  * for the bridge.
411  *   Adds a attribute group "bridge" containing tuning parameters.
412  *   Binary attribute containing the forward table
413  *   Sub directory to hold links to interfaces.
414  *
415  * Note: the ifobj exists only to be a subdirectory
416  *   to hold links.  The ifobj exists in same data structure
417  *   as it's parent the bridge so reference counting works.
418  */
419 int br_sysfs_addbr(struct net_device *dev)
420 {
421         struct kobject *brobj = &dev->dev.kobj;
422         struct net_bridge *br = netdev_priv(dev);
423         int err;
424
425         err = sysfs_create_group(brobj, &bridge_group);
426         if (err) {
427                 pr_info("%s: can't create group %s/%s\n",
428                         __func__, dev->name, bridge_group.name);
429                 goto out1;
430         }
431
432         err = sysfs_create_bin_file(brobj, &bridge_forward);
433         if (err) {
434                 pr_info("%s: can't create attribute file %s/%s\n",
435                         __func__, dev->name, bridge_forward.attr.name);
436                 goto out2;
437         }
438
439         br->ifobj = kobject_create_and_add(SYSFS_BRIDGE_PORT_SUBDIR, brobj);
440         if (!br->ifobj) {
441                 pr_info("%s: can't add kobject (directory) %s/%s\n",
442                         __func__, dev->name, SYSFS_BRIDGE_PORT_SUBDIR);
443                 goto out3;
444         }
445         return 0;
446  out3:
447         sysfs_remove_bin_file(&dev->dev.kobj, &bridge_forward);
448  out2:
449         sysfs_remove_group(&dev->dev.kobj, &bridge_group);
450  out1:
451         return err;
452
453 }
454
455 void br_sysfs_delbr(struct net_device *dev)
456 {
457         struct kobject *kobj = &dev->dev.kobj;
458         struct net_bridge *br = netdev_priv(dev);
459
460         kobject_put(br->ifobj);
461         sysfs_remove_bin_file(kobj, &bridge_forward);
462         sysfs_remove_group(kobj, &bridge_group);
463 }