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/kernel.h>
15 #include <linux/netdevice.h>
16 #include <linux/if_bridge.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/spinlock.h>
19 #include <linux/times.h>
20
21 #include "br_private.h"
22
23 #define to_class_dev(obj) container_of(obj,struct class_device,kobj)
24 #define to_net_dev(class) container_of(class, struct net_device, class_dev)
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 class_device *cd,
31 const char *buf, size_t len,
32 void (*set)(struct net_bridge *, unsigned long))
33 {
34 struct net_bridge *br = to_bridge(cd);
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 class_device *cd, char *buf)
53 {
54 struct net_bridge *br = to_bridge(cd);
55 return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay));
56 }
57
58 static void set_forward_delay(struct net_bridge *br, unsigned long val)
59 {
60 unsigned long delay = clock_t_to_jiffies(val);
61 br->forward_delay = delay;
62 if (br_is_root_bridge(br))
63 br->bridge_forward_delay = delay;
64 }
65
66 static ssize_t store_forward_delay(struct class_device *cd, const char *buf,
67 size_t len)
68 {
69 return store_bridge_parm(cd, buf, len, set_forward_delay);
70 }
71 static CLASS_DEVICE_ATTR(forward_delay, S_IRUGO | S_IWUSR,
72 show_forward_delay, store_forward_delay);
73
74 static ssize_t show_hello_time(struct class_device *cd, char *buf)
75 {
76 return sprintf(buf, "%lu\n",
77 jiffies_to_clock_t(to_bridge(cd)->hello_time));
78 }
79
80 static void set_hello_time(struct net_bridge *br, unsigned long val)
81 {
82 unsigned long t = clock_t_to_jiffies(val);
83 br->hello_time = t;
84 if (br_is_root_bridge(br))
85 br->bridge_hello_time = t;
86 }
87
88 static ssize_t store_hello_time(struct class_device *cd, const char *buf,
89 size_t len)
90 {
91 return store_bridge_parm(cd, buf, len, set_hello_time);
92 }
93
94 static CLASS_DEVICE_ATTR(hello_time, S_IRUGO | S_IWUSR, show_hello_time,
95 store_hello_time);
96
97 static ssize_t show_max_age(struct class_device *cd, char *buf)
98 {
99 return sprintf(buf, "%lu\n",
100 jiffies_to_clock_t(to_bridge(cd)->max_age));
101 }
102
103 static void set_max_age(struct net_bridge *br, unsigned long val)
104 {
105 unsigned long t = clock_t_to_jiffies(val);
106 br->max_age = t;
107 if (br_is_root_bridge(br))
108 br->bridge_max_age = t;
109 }
110
111 static ssize_t store_max_age(struct class_device *cd, const char *buf,
112 size_t len)
113 {
114 return store_bridge_parm(cd, buf, len, set_max_age);
115 }
116
117 static CLASS_DEVICE_ATTR(max_age, S_IRUGO | S_IWUSR, show_max_age,
118 store_max_age);
119
120 static ssize_t show_ageing_time(struct class_device *cd, char *buf)
121 {
122 struct net_bridge *br = to_bridge(cd);
123 return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time));
124 }
125
126 static void set_ageing_time(struct net_bridge *br, unsigned long val)
127 {
128 br->ageing_time = clock_t_to_jiffies(val);
129 }
130
131 static ssize_t store_ageing_time(struct class_device *cd, const char *buf,
132 size_t len)
133 {
134 return store_bridge_parm(cd, buf, len, set_ageing_time);
135 }
136
137 static CLASS_DEVICE_ATTR(ageing_time, S_IRUGO | S_IWUSR, show_ageing_time,
138 store_ageing_time);
139 static ssize_t show_stp_state(struct class_device *cd, char *buf)
140 {
141 struct net_bridge *br = to_bridge(cd);
142 return sprintf(buf, "%d\n", br->stp_enabled);
143 }
144
145 static void set_stp_state(struct net_bridge *br, unsigned long val)
146 {
147 br->stp_enabled = val;
148 }
149
150 static ssize_t store_stp_state(struct class_device *cd,
151 const char *buf, size_t len)
152 {
153 return store_bridge_parm(cd, buf, len, set_stp_state);
154 }
155
156 static CLASS_DEVICE_ATTR(stp_state, S_IRUGO | S_IWUSR, show_stp_state,
157 store_stp_state);
158
159 static ssize_t show_priority(struct class_device *cd, char *buf)
160 {
161 struct net_bridge *br = to_bridge(cd);
162 return sprintf(buf, "%d\n",
163 (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]);
164 }
165
166 static void set_priority(struct net_bridge *br, unsigned long val)
167 {
168 br_stp_set_bridge_priority(br, (u16) val);
169 }
170
171 static ssize_t store_priority(struct class_device *cd,
172 const char *buf, size_t len)
173 {
174 return store_bridge_parm(cd, buf, len, set_priority);
175 }
176 static CLASS_DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, show_priority,
177 store_priority);
178
179 static ssize_t show_root_id(struct class_device *cd, char *buf)
180 {
181 return br_show_bridge_id(buf, &to_bridge(cd)->designated_root);
182 }
183 static CLASS_DEVICE_ATTR(root_id, S_IRUGO, show_root_id, NULL);
184
185 static ssize_t show_bridge_id(struct class_device *cd, char *buf)
186 {
187 return br_show_bridge_id(buf, &to_bridge(cd)->bridge_id);
188 }
189 static CLASS_DEVICE_ATTR(bridge_id, S_IRUGO, show_bridge_id, NULL);
190
191 static ssize_t show_root_port(struct class_device *cd, char *buf)
192 {
193 return sprintf(buf, "%d\n", to_bridge(cd)->root_port);
194 }
195 static CLASS_DEVICE_ATTR(root_port, S_IRUGO, show_root_port, NULL);
196
197 static ssize_t show_root_path_cost(struct class_device *cd, char *buf)
198 {
199 return sprintf(buf, "%d\n", to_bridge(cd)->root_path_cost);
200 }
201 static CLASS_DEVICE_ATTR(root_path_cost, S_IRUGO, show_root_path_cost, NULL);
202
203 static ssize_t show_topology_change(struct class_device *cd, char *buf)
204 {
205 return sprintf(buf, "%d\n", to_bridge(cd)->topology_change);
206 }
207 static CLASS_DEVICE_ATTR(topology_change, S_IRUGO, show_topology_change, NULL);
208
209 static ssize_t show_topology_change_detected(struct class_device *cd, char *buf)
210 {
211 struct net_bridge *br = to_bridge(cd);
212 return sprintf(buf, "%d\n", br->topology_change_detected);
213 }
214 static CLASS_DEVICE_ATTR(topology_change_detected, S_IRUGO, show_topology_change_detected, NULL);
215
216 static ssize_t show_hello_timer(struct class_device *cd, char *buf)
217 {
218 struct net_bridge *br = to_bridge(cd);
219 return sprintf(buf, "%ld\n", br_timer_value(&br->hello_timer));
220 }
221 static CLASS_DEVICE_ATTR(hello_timer, S_IRUGO, show_hello_timer, NULL);
222
223 static ssize_t show_tcn_timer(struct class_device *cd, char *buf)
224 {
225 struct net_bridge *br = to_bridge(cd);
226 return sprintf(buf, "%ld\n", br_timer_value(&br->tcn_timer));
227 }
228 static CLASS_DEVICE_ATTR(tcn_timer, S_IRUGO, show_tcn_timer, NULL);
229
230 static ssize_t show_topology_change_timer(struct class_device *cd, char *buf)
231 {
232 struct net_bridge *br = to_bridge(cd);
233 return sprintf(buf, "%ld\n", br_timer_value(&br->topology_change_timer));
234 }
235 static CLASS_DEVICE_ATTR(topology_change_timer, S_IRUGO, show_topology_change_timer, NULL);
236
237 static ssize_t show_gc_timer(struct class_device *cd, char *buf)
238 {
239 struct net_bridge *br = to_bridge(cd);
240 return sprintf(buf, "%ld\n", br_timer_value(&br->gc_timer));
241 }
242 static CLASS_DEVICE_ATTR(gc_timer, S_IRUGO, show_gc_timer, NULL);
243
244 static struct attribute *bridge_attrs[] = {
245 &class_device_attr_forward_delay.attr,
246 &class_device_attr_hello_time.attr,
247 &class_device_attr_max_age.attr,
248 &class_device_attr_ageing_time.attr,
249 &class_device_attr_stp_state.attr,
250 &class_device_attr_priority.attr,
251 &class_device_attr_bridge_id.attr,
252 &class_device_attr_root_id.attr,
253 &class_device_attr_root_path_cost.attr,
254 &class_device_attr_root_port.attr,
255 &class_device_attr_topology_change.attr,
256 &class_device_attr_topology_change_detected.attr,
257 &class_device_attr_hello_timer.attr,
258 &class_device_attr_tcn_timer.attr,
259 &class_device_attr_topology_change_timer.attr,
260 &class_device_attr_gc_timer.attr,
261 NULL
262 };
263
264 static struct attribute_group bridge_group = {
265 .name = SYSFS_BRIDGE_ATTR,
266 .attrs = bridge_attrs,
267 };
268
269 /*
270 * Export the forwarding information table as a binary file
271 * The records are struct __fdb_entry.
272 *
273 * Returns the number of bytes read.
274 */
275 static ssize_t brforward_read(struct kobject *kobj, char *buf,
276 loff_t off, size_t count)
277 {
278 struct class_device *cdev = to_class_dev(kobj);
279 struct net_bridge *br = to_bridge(cdev);
280 int n;
281
282 /* must read whole records */
283 if (off % sizeof(struct __fdb_entry) != 0)
284 return -EINVAL;
285
286 n = br_fdb_fillbuf(br, buf,
287 count / sizeof(struct __fdb_entry),
288 off / sizeof(struct __fdb_entry));
289
290 if (n > 0)
291 n *= sizeof(struct __fdb_entry);
292
293 return n;
294 }
295
296 static struct bin_attribute bridge_forward = {
297 .attr = { .name = SYSFS_BRIDGE_FDB,
298 .mode = S_IRUGO,
299 .owner = THIS_MODULE, },
300 .read = brforward_read,
301 };
302
303 /*
304 * Add entries in sysfs onto the existing network class device
305 * for the bridge.
306 * Adds a attribute group "bridge" containing tuning parameters.
307 * Binary attribute containing the forward table
308 * Sub directory to hold links to interfaces.
309 *
310 * Note: the ifobj exists only to be a subdirectory
311 * to hold links. The ifobj exists in same data structure
312 * as it's parent the bridge so reference counting works.
313 */
314 int br_sysfs_addbr(struct net_device *dev)
315 {
316 struct kobject *brobj = &dev->class_dev.kobj;
317 struct net_bridge *br = netdev_priv(dev);
318 int err;
319
320 err = sysfs_create_group(brobj, &bridge_group);
321 if (err) {
322 pr_info("%s: can't create group %s/%s\n",
323 __FUNCTION__, dev->name, bridge_group.name);
324 goto out1;
325 }
326
327 err = sysfs_create_bin_file(brobj, &bridge_forward);
328 if (err) {
329 pr_info("%s: can't create attribue file %s/%s\n",
330 __FUNCTION__, dev->name, bridge_forward.attr.name);
331 goto out2;
332 }
333
334
335 kobject_set_name(&br->ifobj, SYSFS_BRIDGE_PORT_SUBDIR);
336 br->ifobj.ktype = NULL;
337 br->ifobj.kset = NULL;
338 br->ifobj.parent = brobj;
339
340 err = kobject_register(&br->ifobj);
341 if (err) {
342 pr_info("%s: can't add kobject (directory) %s/%s\n",
343 __FUNCTION__, dev->name, br->ifobj.name);
344 goto out3;
345 }
346 return 0;
347 out3:
348 sysfs_remove_bin_file(&dev->class_dev.kobj, &bridge_forward);
349 out2:
350 sysfs_remove_group(&dev->class_dev.kobj, &bridge_group);
351 out1:
352 return err;
353
354 }
355
356 void br_sysfs_delbr(struct net_device *dev)
357 {
358 struct kobject *kobj = &dev->class_dev.kobj;
359 struct net_bridge *br = netdev_priv(dev);
360
361 kobject_unregister(&br->ifobj);
362 sysfs_remove_bin_file(kobj, &bridge_forward);
363 sysfs_remove_group(kobj, &bridge_group);
364 }
365
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