Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
[pandora-kernel.git] / net / core / net-sysfs.c
1 /*
2  * net-sysfs.c - network device class and attributes
3  *
4  * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
5  *
6  *      This program is free software; you can redistribute it and/or
7  *      modify it under the terms of the GNU General Public License
8  *      as published by the Free Software Foundation; either version
9  *      2 of the License, or (at your option) any later version.
10  */
11
12 #include <linux/capability.h>
13 #include <linux/kernel.h>
14 #include <linux/netdevice.h>
15 #include <linux/if_arp.h>
16 #include <net/sock.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/wireless.h>
19 #include <net/iw_handler.h>
20
21 #include "net-sysfs.h"
22
23 #ifdef CONFIG_SYSFS
24 static const char fmt_hex[] = "%#x\n";
25 static const char fmt_long_hex[] = "%#lx\n";
26 static const char fmt_dec[] = "%d\n";
27 static const char fmt_ulong[] = "%lu\n";
28
29 static inline int dev_isalive(const struct net_device *dev)
30 {
31         return dev->reg_state <= NETREG_REGISTERED;
32 }
33
34 /* use same locking rules as GIF* ioctl's */
35 static ssize_t netdev_show(const struct device *dev,
36                            struct device_attribute *attr, char *buf,
37                            ssize_t (*format)(const struct net_device *, char *))
38 {
39         struct net_device *net = to_net_dev(dev);
40         ssize_t ret = -EINVAL;
41
42         read_lock(&dev_base_lock);
43         if (dev_isalive(net))
44                 ret = (*format)(net, buf);
45         read_unlock(&dev_base_lock);
46
47         return ret;
48 }
49
50 /* generate a show function for simple field */
51 #define NETDEVICE_SHOW(field, format_string)                            \
52 static ssize_t format_##field(const struct net_device *net, char *buf)  \
53 {                                                                       \
54         return sprintf(buf, format_string, net->field);                 \
55 }                                                                       \
56 static ssize_t show_##field(struct device *dev,                         \
57                             struct device_attribute *attr, char *buf)   \
58 {                                                                       \
59         return netdev_show(dev, attr, buf, format_##field);             \
60 }
61
62
63 /* use same locking and permission rules as SIF* ioctl's */
64 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
65                             const char *buf, size_t len,
66                             int (*set)(struct net_device *, unsigned long))
67 {
68         struct net_device *net = to_net_dev(dev);
69         char *endp;
70         unsigned long new;
71         int ret = -EINVAL;
72
73         if (!capable(CAP_NET_ADMIN))
74                 return -EPERM;
75
76         new = simple_strtoul(buf, &endp, 0);
77         if (endp == buf)
78                 goto err;
79
80         rtnl_lock();
81         if (dev_isalive(net)) {
82                 if ((ret = (*set)(net, new)) == 0)
83                         ret = len;
84         }
85         rtnl_unlock();
86  err:
87         return ret;
88 }
89
90 NETDEVICE_SHOW(addr_len, fmt_dec);
91 NETDEVICE_SHOW(iflink, fmt_dec);
92 NETDEVICE_SHOW(ifindex, fmt_dec);
93 NETDEVICE_SHOW(features, fmt_long_hex);
94 NETDEVICE_SHOW(type, fmt_dec);
95 NETDEVICE_SHOW(link_mode, fmt_dec);
96
97 /* use same locking rules as GIFHWADDR ioctl's */
98 static ssize_t format_addr(char *buf, const unsigned char *addr, int len)
99 {
100         int i;
101         char *cp = buf;
102
103         for (i = 0; i < len; i++)
104                 cp += sprintf(cp, "%02x%c", addr[i],
105                               i == (len - 1) ? '\n' : ':');
106         return cp - buf;
107 }
108
109 static ssize_t show_address(struct device *dev, struct device_attribute *attr,
110                             char *buf)
111 {
112         struct net_device *net = to_net_dev(dev);
113         ssize_t ret = -EINVAL;
114
115         read_lock(&dev_base_lock);
116         if (dev_isalive(net))
117             ret = format_addr(buf, net->dev_addr, net->addr_len);
118         read_unlock(&dev_base_lock);
119         return ret;
120 }
121
122 static ssize_t show_broadcast(struct device *dev,
123                             struct device_attribute *attr, char *buf)
124 {
125         struct net_device *net = to_net_dev(dev);
126         if (dev_isalive(net))
127                 return format_addr(buf, net->broadcast, net->addr_len);
128         return -EINVAL;
129 }
130
131 static ssize_t show_carrier(struct device *dev,
132                             struct device_attribute *attr, char *buf)
133 {
134         struct net_device *netdev = to_net_dev(dev);
135         if (netif_running(netdev)) {
136                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
137         }
138         return -EINVAL;
139 }
140
141 static ssize_t show_dormant(struct device *dev,
142                             struct device_attribute *attr, char *buf)
143 {
144         struct net_device *netdev = to_net_dev(dev);
145
146         if (netif_running(netdev))
147                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
148
149         return -EINVAL;
150 }
151
152 static const char *operstates[] = {
153         "unknown",
154         "notpresent", /* currently unused */
155         "down",
156         "lowerlayerdown",
157         "testing", /* currently unused */
158         "dormant",
159         "up"
160 };
161
162 static ssize_t show_operstate(struct device *dev,
163                               struct device_attribute *attr, char *buf)
164 {
165         const struct net_device *netdev = to_net_dev(dev);
166         unsigned char operstate;
167
168         read_lock(&dev_base_lock);
169         operstate = netdev->operstate;
170         if (!netif_running(netdev))
171                 operstate = IF_OPER_DOWN;
172         read_unlock(&dev_base_lock);
173
174         if (operstate >= ARRAY_SIZE(operstates))
175                 return -EINVAL; /* should not happen */
176
177         return sprintf(buf, "%s\n", operstates[operstate]);
178 }
179
180 /* read-write attributes */
181 NETDEVICE_SHOW(mtu, fmt_dec);
182
183 static int change_mtu(struct net_device *net, unsigned long new_mtu)
184 {
185         return dev_set_mtu(net, (int) new_mtu);
186 }
187
188 static ssize_t store_mtu(struct device *dev, struct device_attribute *attr,
189                          const char *buf, size_t len)
190 {
191         return netdev_store(dev, attr, buf, len, change_mtu);
192 }
193
194 NETDEVICE_SHOW(flags, fmt_hex);
195
196 static int change_flags(struct net_device *net, unsigned long new_flags)
197 {
198         return dev_change_flags(net, (unsigned) new_flags);
199 }
200
201 static ssize_t store_flags(struct device *dev, struct device_attribute *attr,
202                            const char *buf, size_t len)
203 {
204         return netdev_store(dev, attr, buf, len, change_flags);
205 }
206
207 NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
208
209 static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
210 {
211         net->tx_queue_len = new_len;
212         return 0;
213 }
214
215 static ssize_t store_tx_queue_len(struct device *dev,
216                                   struct device_attribute *attr,
217                                   const char *buf, size_t len)
218 {
219         return netdev_store(dev, attr, buf, len, change_tx_queue_len);
220 }
221
222 static struct device_attribute net_class_attributes[] = {
223         __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
224         __ATTR(iflink, S_IRUGO, show_iflink, NULL),
225         __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
226         __ATTR(features, S_IRUGO, show_features, NULL),
227         __ATTR(type, S_IRUGO, show_type, NULL),
228         __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
229         __ATTR(address, S_IRUGO, show_address, NULL),
230         __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
231         __ATTR(carrier, S_IRUGO, show_carrier, NULL),
232         __ATTR(dormant, S_IRUGO, show_dormant, NULL),
233         __ATTR(operstate, S_IRUGO, show_operstate, NULL),
234         __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
235         __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
236         __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
237                store_tx_queue_len),
238         {}
239 };
240
241 /* Show a given an attribute in the statistics group */
242 static ssize_t netstat_show(const struct device *d,
243                             struct device_attribute *attr, char *buf,
244                             unsigned long offset)
245 {
246         struct net_device *dev = to_net_dev(d);
247         struct net_device_stats *stats;
248         ssize_t ret = -EINVAL;
249
250         if (offset > sizeof(struct net_device_stats) ||
251             offset % sizeof(unsigned long) != 0)
252                 WARN_ON(1);
253
254         read_lock(&dev_base_lock);
255         if (dev_isalive(dev) && dev->get_stats &&
256             (stats = (*dev->get_stats)(dev)))
257                 ret = sprintf(buf, fmt_ulong,
258                               *(unsigned long *)(((u8 *) stats) + offset));
259
260         read_unlock(&dev_base_lock);
261         return ret;
262 }
263
264 /* generate a read-only statistics attribute */
265 #define NETSTAT_ENTRY(name)                                             \
266 static ssize_t show_##name(struct device *d,                            \
267                            struct device_attribute *attr, char *buf)    \
268 {                                                                       \
269         return netstat_show(d, attr, buf,                               \
270                             offsetof(struct net_device_stats, name));   \
271 }                                                                       \
272 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
273
274 NETSTAT_ENTRY(rx_packets);
275 NETSTAT_ENTRY(tx_packets);
276 NETSTAT_ENTRY(rx_bytes);
277 NETSTAT_ENTRY(tx_bytes);
278 NETSTAT_ENTRY(rx_errors);
279 NETSTAT_ENTRY(tx_errors);
280 NETSTAT_ENTRY(rx_dropped);
281 NETSTAT_ENTRY(tx_dropped);
282 NETSTAT_ENTRY(multicast);
283 NETSTAT_ENTRY(collisions);
284 NETSTAT_ENTRY(rx_length_errors);
285 NETSTAT_ENTRY(rx_over_errors);
286 NETSTAT_ENTRY(rx_crc_errors);
287 NETSTAT_ENTRY(rx_frame_errors);
288 NETSTAT_ENTRY(rx_fifo_errors);
289 NETSTAT_ENTRY(rx_missed_errors);
290 NETSTAT_ENTRY(tx_aborted_errors);
291 NETSTAT_ENTRY(tx_carrier_errors);
292 NETSTAT_ENTRY(tx_fifo_errors);
293 NETSTAT_ENTRY(tx_heartbeat_errors);
294 NETSTAT_ENTRY(tx_window_errors);
295 NETSTAT_ENTRY(rx_compressed);
296 NETSTAT_ENTRY(tx_compressed);
297
298 static struct attribute *netstat_attrs[] = {
299         &dev_attr_rx_packets.attr,
300         &dev_attr_tx_packets.attr,
301         &dev_attr_rx_bytes.attr,
302         &dev_attr_tx_bytes.attr,
303         &dev_attr_rx_errors.attr,
304         &dev_attr_tx_errors.attr,
305         &dev_attr_rx_dropped.attr,
306         &dev_attr_tx_dropped.attr,
307         &dev_attr_multicast.attr,
308         &dev_attr_collisions.attr,
309         &dev_attr_rx_length_errors.attr,
310         &dev_attr_rx_over_errors.attr,
311         &dev_attr_rx_crc_errors.attr,
312         &dev_attr_rx_frame_errors.attr,
313         &dev_attr_rx_fifo_errors.attr,
314         &dev_attr_rx_missed_errors.attr,
315         &dev_attr_tx_aborted_errors.attr,
316         &dev_attr_tx_carrier_errors.attr,
317         &dev_attr_tx_fifo_errors.attr,
318         &dev_attr_tx_heartbeat_errors.attr,
319         &dev_attr_tx_window_errors.attr,
320         &dev_attr_rx_compressed.attr,
321         &dev_attr_tx_compressed.attr,
322         NULL
323 };
324
325
326 static struct attribute_group netstat_group = {
327         .name  = "statistics",
328         .attrs  = netstat_attrs,
329 };
330
331 #ifdef CONFIG_WIRELESS_EXT
332 /* helper function that does all the locking etc for wireless stats */
333 static ssize_t wireless_show(struct device *d, char *buf,
334                              ssize_t (*format)(const struct iw_statistics *,
335                                                char *))
336 {
337         struct net_device *dev = to_net_dev(d);
338         const struct iw_statistics *iw = NULL;
339         ssize_t ret = -EINVAL;
340
341         read_lock(&dev_base_lock);
342         if (dev_isalive(dev)) {
343                 if (dev->wireless_handlers &&
344                     dev->wireless_handlers->get_wireless_stats)
345                         iw = dev->wireless_handlers->get_wireless_stats(dev);
346                 if (iw != NULL)
347                         ret = (*format)(iw, buf);
348         }
349         read_unlock(&dev_base_lock);
350
351         return ret;
352 }
353
354 /* show function template for wireless fields */
355 #define WIRELESS_SHOW(name, field, format_string)                       \
356 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
357 {                                                                       \
358         return sprintf(buf, format_string, iw->field);                  \
359 }                                                                       \
360 static ssize_t show_iw_##name(struct device *d,                         \
361                               struct device_attribute *attr, char *buf) \
362 {                                                                       \
363         return wireless_show(d, buf, format_iw_##name);                 \
364 }                                                                       \
365 static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
366
367 WIRELESS_SHOW(status, status, fmt_hex);
368 WIRELESS_SHOW(link, qual.qual, fmt_dec);
369 WIRELESS_SHOW(level, qual.level, fmt_dec);
370 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
371 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
372 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
373 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
374 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
375 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
376 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
377
378 static struct attribute *wireless_attrs[] = {
379         &dev_attr_status.attr,
380         &dev_attr_link.attr,
381         &dev_attr_level.attr,
382         &dev_attr_noise.attr,
383         &dev_attr_nwid.attr,
384         &dev_attr_crypt.attr,
385         &dev_attr_fragment.attr,
386         &dev_attr_retries.attr,
387         &dev_attr_misc.attr,
388         &dev_attr_beacon.attr,
389         NULL
390 };
391
392 static struct attribute_group wireless_group = {
393         .name = "wireless",
394         .attrs = wireless_attrs,
395 };
396 #endif
397
398 #endif /* CONFIG_SYSFS */
399
400 #ifdef CONFIG_HOTPLUG
401 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
402 {
403         struct net_device *dev = to_net_dev(d);
404         int retval;
405
406         /* pass interface to uevent. */
407         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
408         if (retval)
409                 goto exit;
410
411         /* pass ifindex to uevent.
412          * ifindex is useful as it won't change (interface name may change)
413          * and is what RtNetlink uses natively. */
414         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
415
416 exit:
417         return retval;
418 }
419 #endif
420
421 /*
422  *      netdev_release -- destroy and free a dead device.
423  *      Called when last reference to device kobject is gone.
424  */
425 static void netdev_release(struct device *d)
426 {
427         struct net_device *dev = to_net_dev(d);
428
429         BUG_ON(dev->reg_state != NETREG_RELEASED);
430
431         kfree((char *)dev - dev->padded);
432 }
433
434 static struct class net_class = {
435         .name = "net",
436         .dev_release = netdev_release,
437 #ifdef CONFIG_SYSFS
438         .dev_attrs = net_class_attributes,
439 #endif /* CONFIG_SYSFS */
440 #ifdef CONFIG_HOTPLUG
441         .dev_uevent = netdev_uevent,
442 #endif
443 };
444
445 /* Delete sysfs entries but hold kobject reference until after all
446  * netdev references are gone.
447  */
448 void netdev_unregister_kobject(struct net_device * net)
449 {
450         struct device *dev = &(net->dev);
451
452         kobject_get(&dev->kobj);
453         device_del(dev);
454 }
455
456 /* Create sysfs entries for network device. */
457 int netdev_register_kobject(struct net_device *net)
458 {
459         struct device *dev = &(net->dev);
460         struct attribute_group **groups = net->sysfs_groups;
461
462         device_initialize(dev);
463         dev->class = &net_class;
464         dev->platform_data = net;
465         dev->groups = groups;
466
467         BUILD_BUG_ON(BUS_ID_SIZE < IFNAMSIZ);
468         strlcpy(dev->bus_id, net->name, BUS_ID_SIZE);
469
470 #ifdef CONFIG_SYSFS
471         if (net->get_stats)
472                 *groups++ = &netstat_group;
473
474 #ifdef CONFIG_WIRELESS_EXT
475         if (net->wireless_handlers && net->wireless_handlers->get_wireless_stats)
476                 *groups++ = &wireless_group;
477 #endif
478 #endif /* CONFIG_SYSFS */
479
480         return device_add(dev);
481 }
482
483 int netdev_kobject_init(void)
484 {
485         return class_register(&net_class);
486 }