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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 <linux/slab.h> |
17 | #include <net/sock.h> |
18 | #include <linux/rtnetlink.h> |
19 | #include <linux/wireless.h> |
20 | #include <net/wext.h> |
21 | |
22 | #include "net-sysfs.h" |
23 | |
24 | #ifdef CONFIG_SYSFS |
25 | static const char fmt_hex[] = "%#x\n"; |
26 | static const char fmt_long_hex[] = "%#lx\n"; |
27 | static const char fmt_dec[] = "%d\n"; |
28 | static const char fmt_ulong[] = "%lu\n"; |
29 | |
30 | static inline int dev_isalive(const struct net_device *dev) |
31 | { |
32 | return dev->reg_state <= NETREG_REGISTERED; |
33 | } |
34 | |
35 | /* use same locking rules as GIF* ioctl's */ |
36 | static ssize_t netdev_show(const struct device *dev, |
37 | struct device_attribute *attr, char *buf, |
38 | ssize_t (*format)(const struct net_device *, char *)) |
39 | { |
40 | struct net_device *net = to_net_dev(dev); |
41 | ssize_t ret = -EINVAL; |
42 | |
43 | read_lock(&dev_base_lock); |
44 | if (dev_isalive(net)) |
45 | ret = (*format)(net, buf); |
46 | read_unlock(&dev_base_lock); |
47 | |
48 | return ret; |
49 | } |
50 | |
51 | /* generate a show function for simple field */ |
52 | #define NETDEVICE_SHOW(field, format_string) \ |
53 | static ssize_t format_##field(const struct net_device *net, char *buf) \ |
54 | { \ |
55 | return sprintf(buf, format_string, net->field); \ |
56 | } \ |
57 | static ssize_t show_##field(struct device *dev, \ |
58 | struct device_attribute *attr, char *buf) \ |
59 | { \ |
60 | return netdev_show(dev, attr, buf, format_##field); \ |
61 | } |
62 | |
63 | |
64 | /* use same locking and permission rules as SIF* ioctl's */ |
65 | static ssize_t netdev_store(struct device *dev, struct device_attribute *attr, |
66 | const char *buf, size_t len, |
67 | int (*set)(struct net_device *, unsigned long)) |
68 | { |
69 | struct net_device *net = to_net_dev(dev); |
70 | char *endp; |
71 | unsigned long new; |
72 | int ret = -EINVAL; |
73 | |
74 | if (!capable(CAP_NET_ADMIN)) |
75 | return -EPERM; |
76 | |
77 | new = simple_strtoul(buf, &endp, 0); |
78 | if (endp == buf) |
79 | goto err; |
80 | |
81 | if (!rtnl_trylock()) |
82 | return restart_syscall(); |
83 | |
84 | if (dev_isalive(net)) { |
85 | if ((ret = (*set)(net, new)) == 0) |
86 | ret = len; |
87 | } |
88 | rtnl_unlock(); |
89 | err: |
90 | return ret; |
91 | } |
92 | |
93 | NETDEVICE_SHOW(dev_id, fmt_hex); |
94 | NETDEVICE_SHOW(addr_len, fmt_dec); |
95 | NETDEVICE_SHOW(iflink, fmt_dec); |
96 | NETDEVICE_SHOW(ifindex, fmt_dec); |
97 | NETDEVICE_SHOW(features, fmt_long_hex); |
98 | NETDEVICE_SHOW(type, fmt_dec); |
99 | NETDEVICE_SHOW(link_mode, fmt_dec); |
100 | |
101 | /* use same locking rules as GIFHWADDR ioctl's */ |
102 | static ssize_t show_address(struct device *dev, struct device_attribute *attr, |
103 | char *buf) |
104 | { |
105 | struct net_device *net = to_net_dev(dev); |
106 | ssize_t ret = -EINVAL; |
107 | |
108 | read_lock(&dev_base_lock); |
109 | if (dev_isalive(net)) |
110 | ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len); |
111 | read_unlock(&dev_base_lock); |
112 | return ret; |
113 | } |
114 | |
115 | static ssize_t show_broadcast(struct device *dev, |
116 | struct device_attribute *attr, char *buf) |
117 | { |
118 | struct net_device *net = to_net_dev(dev); |
119 | if (dev_isalive(net)) |
120 | return sysfs_format_mac(buf, net->broadcast, net->addr_len); |
121 | return -EINVAL; |
122 | } |
123 | |
124 | static ssize_t show_carrier(struct device *dev, |
125 | struct device_attribute *attr, char *buf) |
126 | { |
127 | struct net_device *netdev = to_net_dev(dev); |
128 | if (netif_running(netdev)) { |
129 | return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev)); |
130 | } |
131 | return -EINVAL; |
132 | } |
133 | |
134 | static ssize_t show_speed(struct device *dev, |
135 | struct device_attribute *attr, char *buf) |
136 | { |
137 | struct net_device *netdev = to_net_dev(dev); |
138 | int ret = -EINVAL; |
139 | |
140 | if (!rtnl_trylock()) |
141 | return restart_syscall(); |
142 | |
143 | if (netif_running(netdev) && |
144 | netdev->ethtool_ops && |
145 | netdev->ethtool_ops->get_settings) { |
146 | struct ethtool_cmd cmd = { ETHTOOL_GSET }; |
147 | |
148 | if (!netdev->ethtool_ops->get_settings(netdev, &cmd)) |
149 | ret = sprintf(buf, fmt_dec, ethtool_cmd_speed(&cmd)); |
150 | } |
151 | rtnl_unlock(); |
152 | return ret; |
153 | } |
154 | |
155 | static ssize_t show_duplex(struct device *dev, |
156 | struct device_attribute *attr, char *buf) |
157 | { |
158 | struct net_device *netdev = to_net_dev(dev); |
159 | int ret = -EINVAL; |
160 | |
161 | if (!rtnl_trylock()) |
162 | return restart_syscall(); |
163 | |
164 | if (netif_running(netdev) && |
165 | netdev->ethtool_ops && |
166 | netdev->ethtool_ops->get_settings) { |
167 | struct ethtool_cmd cmd = { ETHTOOL_GSET }; |
168 | |
169 | if (!netdev->ethtool_ops->get_settings(netdev, &cmd)) |
170 | ret = sprintf(buf, "%s\n", cmd.duplex ? "full" : "half"); |
171 | } |
172 | rtnl_unlock(); |
173 | return ret; |
174 | } |
175 | |
176 | static ssize_t show_dormant(struct device *dev, |
177 | struct device_attribute *attr, char *buf) |
178 | { |
179 | struct net_device *netdev = to_net_dev(dev); |
180 | |
181 | if (netif_running(netdev)) |
182 | return sprintf(buf, fmt_dec, !!netif_dormant(netdev)); |
183 | |
184 | return -EINVAL; |
185 | } |
186 | |
187 | static const char *const operstates[] = { |
188 | "unknown", |
189 | "notpresent", /* currently unused */ |
190 | "down", |
191 | "lowerlayerdown", |
192 | "testing", /* currently unused */ |
193 | "dormant", |
194 | "up" |
195 | }; |
196 | |
197 | static ssize_t show_operstate(struct device *dev, |
198 | struct device_attribute *attr, char *buf) |
199 | { |
200 | const struct net_device *netdev = to_net_dev(dev); |
201 | unsigned char operstate; |
202 | |
203 | read_lock(&dev_base_lock); |
204 | operstate = netdev->operstate; |
205 | if (!netif_running(netdev)) |
206 | operstate = IF_OPER_DOWN; |
207 | read_unlock(&dev_base_lock); |
208 | |
209 | if (operstate >= ARRAY_SIZE(operstates)) |
210 | return -EINVAL; /* should not happen */ |
211 | |
212 | return sprintf(buf, "%s\n", operstates[operstate]); |
213 | } |
214 | |
215 | /* read-write attributes */ |
216 | NETDEVICE_SHOW(mtu, fmt_dec); |
217 | |
218 | static int change_mtu(struct net_device *net, unsigned long new_mtu) |
219 | { |
220 | return dev_set_mtu(net, (int) new_mtu); |
221 | } |
222 | |
223 | static ssize_t store_mtu(struct device *dev, struct device_attribute *attr, |
224 | const char *buf, size_t len) |
225 | { |
226 | return netdev_store(dev, attr, buf, len, change_mtu); |
227 | } |
228 | |
229 | NETDEVICE_SHOW(flags, fmt_hex); |
230 | |
231 | static int change_flags(struct net_device *net, unsigned long new_flags) |
232 | { |
233 | return dev_change_flags(net, (unsigned) new_flags); |
234 | } |
235 | |
236 | static ssize_t store_flags(struct device *dev, struct device_attribute *attr, |
237 | const char *buf, size_t len) |
238 | { |
239 | return netdev_store(dev, attr, buf, len, change_flags); |
240 | } |
241 | |
242 | NETDEVICE_SHOW(tx_queue_len, fmt_ulong); |
243 | |
244 | static int change_tx_queue_len(struct net_device *net, unsigned long new_len) |
245 | { |
246 | net->tx_queue_len = new_len; |
247 | return 0; |
248 | } |
249 | |
250 | static ssize_t store_tx_queue_len(struct device *dev, |
251 | struct device_attribute *attr, |
252 | const char *buf, size_t len) |
253 | { |
254 | return netdev_store(dev, attr, buf, len, change_tx_queue_len); |
255 | } |
256 | |
257 | static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr, |
258 | const char *buf, size_t len) |
259 | { |
260 | struct net_device *netdev = to_net_dev(dev); |
261 | size_t count = len; |
262 | ssize_t ret; |
263 | |
264 | if (!capable(CAP_NET_ADMIN)) |
265 | return -EPERM; |
266 | |
267 | /* ignore trailing newline */ |
268 | if (len > 0 && buf[len - 1] == '\n') |
269 | --count; |
270 | |
271 | if (!rtnl_trylock()) |
272 | return restart_syscall(); |
273 | ret = dev_set_alias(netdev, buf, count); |
274 | rtnl_unlock(); |
275 | |
276 | return ret < 0 ? ret : len; |
277 | } |
278 | |
279 | static ssize_t show_ifalias(struct device *dev, |
280 | struct device_attribute *attr, char *buf) |
281 | { |
282 | const struct net_device *netdev = to_net_dev(dev); |
283 | ssize_t ret = 0; |
284 | |
285 | if (!rtnl_trylock()) |
286 | return restart_syscall(); |
287 | if (netdev->ifalias) |
288 | ret = sprintf(buf, "%s\n", netdev->ifalias); |
289 | rtnl_unlock(); |
290 | return ret; |
291 | } |
292 | |
293 | static struct device_attribute net_class_attributes[] = { |
294 | __ATTR(addr_len, S_IRUGO, show_addr_len, NULL), |
295 | __ATTR(dev_id, S_IRUGO, show_dev_id, NULL), |
296 | __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias), |
297 | __ATTR(iflink, S_IRUGO, show_iflink, NULL), |
298 | __ATTR(ifindex, S_IRUGO, show_ifindex, NULL), |
299 | __ATTR(features, S_IRUGO, show_features, NULL), |
300 | __ATTR(type, S_IRUGO, show_type, NULL), |
301 | __ATTR(link_mode, S_IRUGO, show_link_mode, NULL), |
302 | __ATTR(address, S_IRUGO, show_address, NULL), |
303 | __ATTR(broadcast, S_IRUGO, show_broadcast, NULL), |
304 | __ATTR(carrier, S_IRUGO, show_carrier, NULL), |
305 | __ATTR(speed, S_IRUGO, show_speed, NULL), |
306 | __ATTR(duplex, S_IRUGO, show_duplex, NULL), |
307 | __ATTR(dormant, S_IRUGO, show_dormant, NULL), |
308 | __ATTR(operstate, S_IRUGO, show_operstate, NULL), |
309 | __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu), |
310 | __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags), |
311 | __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len, |
312 | store_tx_queue_len), |
313 | {} |
314 | }; |
315 | |
316 | /* Show a given an attribute in the statistics group */ |
317 | static ssize_t netstat_show(const struct device *d, |
318 | struct device_attribute *attr, char *buf, |
319 | unsigned long offset) |
320 | { |
321 | struct net_device *dev = to_net_dev(d); |
322 | ssize_t ret = -EINVAL; |
323 | |
324 | WARN_ON(offset > sizeof(struct net_device_stats) || |
325 | offset % sizeof(unsigned long) != 0); |
326 | |
327 | read_lock(&dev_base_lock); |
328 | if (dev_isalive(dev)) { |
329 | const struct net_device_stats *stats = dev_get_stats(dev); |
330 | ret = sprintf(buf, fmt_ulong, |
331 | *(unsigned long *)(((u8 *) stats) + offset)); |
332 | } |
333 | read_unlock(&dev_base_lock); |
334 | return ret; |
335 | } |
336 | |
337 | /* generate a read-only statistics attribute */ |
338 | #define NETSTAT_ENTRY(name) \ |
339 | static ssize_t show_##name(struct device *d, \ |
340 | struct device_attribute *attr, char *buf) \ |
341 | { \ |
342 | return netstat_show(d, attr, buf, \ |
343 | offsetof(struct net_device_stats, name)); \ |
344 | } \ |
345 | static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL) |
346 | |
347 | NETSTAT_ENTRY(rx_packets); |
348 | NETSTAT_ENTRY(tx_packets); |
349 | NETSTAT_ENTRY(rx_bytes); |
350 | NETSTAT_ENTRY(tx_bytes); |
351 | NETSTAT_ENTRY(rx_errors); |
352 | NETSTAT_ENTRY(tx_errors); |
353 | NETSTAT_ENTRY(rx_dropped); |
354 | NETSTAT_ENTRY(tx_dropped); |
355 | NETSTAT_ENTRY(multicast); |
356 | NETSTAT_ENTRY(collisions); |
357 | NETSTAT_ENTRY(rx_length_errors); |
358 | NETSTAT_ENTRY(rx_over_errors); |
359 | NETSTAT_ENTRY(rx_crc_errors); |
360 | NETSTAT_ENTRY(rx_frame_errors); |
361 | NETSTAT_ENTRY(rx_fifo_errors); |
362 | NETSTAT_ENTRY(rx_missed_errors); |
363 | NETSTAT_ENTRY(tx_aborted_errors); |
364 | NETSTAT_ENTRY(tx_carrier_errors); |
365 | NETSTAT_ENTRY(tx_fifo_errors); |
366 | NETSTAT_ENTRY(tx_heartbeat_errors); |
367 | NETSTAT_ENTRY(tx_window_errors); |
368 | NETSTAT_ENTRY(rx_compressed); |
369 | NETSTAT_ENTRY(tx_compressed); |
370 | |
371 | static struct attribute *netstat_attrs[] = { |
372 | &dev_attr_rx_packets.attr, |
373 | &dev_attr_tx_packets.attr, |
374 | &dev_attr_rx_bytes.attr, |
375 | &dev_attr_tx_bytes.attr, |
376 | &dev_attr_rx_errors.attr, |
377 | &dev_attr_tx_errors.attr, |
378 | &dev_attr_rx_dropped.attr, |
379 | &dev_attr_tx_dropped.attr, |
380 | &dev_attr_multicast.attr, |
381 | &dev_attr_collisions.attr, |
382 | &dev_attr_rx_length_errors.attr, |
383 | &dev_attr_rx_over_errors.attr, |
384 | &dev_attr_rx_crc_errors.attr, |
385 | &dev_attr_rx_frame_errors.attr, |
386 | &dev_attr_rx_fifo_errors.attr, |
387 | &dev_attr_rx_missed_errors.attr, |
388 | &dev_attr_tx_aborted_errors.attr, |
389 | &dev_attr_tx_carrier_errors.attr, |
390 | &dev_attr_tx_fifo_errors.attr, |
391 | &dev_attr_tx_heartbeat_errors.attr, |
392 | &dev_attr_tx_window_errors.attr, |
393 | &dev_attr_rx_compressed.attr, |
394 | &dev_attr_tx_compressed.attr, |
395 | NULL |
396 | }; |
397 | |
398 | |
399 | static struct attribute_group netstat_group = { |
400 | .name = "statistics", |
401 | .attrs = netstat_attrs, |
402 | }; |
403 | |
404 | #ifdef CONFIG_WIRELESS_EXT_SYSFS |
405 | /* helper function that does all the locking etc for wireless stats */ |
406 | static ssize_t wireless_show(struct device *d, char *buf, |
407 | ssize_t (*format)(const struct iw_statistics *, |
408 | char *)) |
409 | { |
410 | struct net_device *dev = to_net_dev(d); |
411 | const struct iw_statistics *iw; |
412 | ssize_t ret = -EINVAL; |
413 | |
414 | if (!rtnl_trylock()) |
415 | return restart_syscall(); |
416 | if (dev_isalive(dev)) { |
417 | iw = get_wireless_stats(dev); |
418 | if (iw) |
419 | ret = (*format)(iw, buf); |
420 | } |
421 | rtnl_unlock(); |
422 | |
423 | return ret; |
424 | } |
425 | |
426 | /* show function template for wireless fields */ |
427 | #define WIRELESS_SHOW(name, field, format_string) \ |
428 | static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \ |
429 | { \ |
430 | return sprintf(buf, format_string, iw->field); \ |
431 | } \ |
432 | static ssize_t show_iw_##name(struct device *d, \ |
433 | struct device_attribute *attr, char *buf) \ |
434 | { \ |
435 | return wireless_show(d, buf, format_iw_##name); \ |
436 | } \ |
437 | static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL) |
438 | |
439 | WIRELESS_SHOW(status, status, fmt_hex); |
440 | WIRELESS_SHOW(link, qual.qual, fmt_dec); |
441 | WIRELESS_SHOW(level, qual.level, fmt_dec); |
442 | WIRELESS_SHOW(noise, qual.noise, fmt_dec); |
443 | WIRELESS_SHOW(nwid, discard.nwid, fmt_dec); |
444 | WIRELESS_SHOW(crypt, discard.code, fmt_dec); |
445 | WIRELESS_SHOW(fragment, discard.fragment, fmt_dec); |
446 | WIRELESS_SHOW(misc, discard.misc, fmt_dec); |
447 | WIRELESS_SHOW(retries, discard.retries, fmt_dec); |
448 | WIRELESS_SHOW(beacon, miss.beacon, fmt_dec); |
449 | |
450 | static struct attribute *wireless_attrs[] = { |
451 | &dev_attr_status.attr, |
452 | &dev_attr_link.attr, |
453 | &dev_attr_level.attr, |
454 | &dev_attr_noise.attr, |
455 | &dev_attr_nwid.attr, |
456 | &dev_attr_crypt.attr, |
457 | &dev_attr_fragment.attr, |
458 | &dev_attr_retries.attr, |
459 | &dev_attr_misc.attr, |
460 | &dev_attr_beacon.attr, |
461 | NULL |
462 | }; |
463 | |
464 | static struct attribute_group wireless_group = { |
465 | .name = "wireless", |
466 | .attrs = wireless_attrs, |
467 | }; |
468 | #endif |
469 | |
470 | #endif /* CONFIG_SYSFS */ |
471 | |
472 | #ifdef CONFIG_HOTPLUG |
473 | static int netdev_uevent(struct device *d, struct kobj_uevent_env *env) |
474 | { |
475 | struct net_device *dev = to_net_dev(d); |
476 | int retval; |
477 | |
478 | if (!net_eq(dev_net(dev), &init_net)) |
479 | return 0; |
480 | |
481 | /* pass interface to uevent. */ |
482 | retval = add_uevent_var(env, "INTERFACE=%s", dev->name); |
483 | if (retval) |
484 | goto exit; |
485 | |
486 | /* pass ifindex to uevent. |
487 | * ifindex is useful as it won't change (interface name may change) |
488 | * and is what RtNetlink uses natively. */ |
489 | retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex); |
490 | |
491 | exit: |
492 | return retval; |
493 | } |
494 | #endif |
495 | |
496 | /* |
497 | * netdev_release -- destroy and free a dead device. |
498 | * Called when last reference to device kobject is gone. |
499 | */ |
500 | static void netdev_release(struct device *d) |
501 | { |
502 | struct net_device *dev = to_net_dev(d); |
503 | |
504 | BUG_ON(dev->reg_state != NETREG_RELEASED); |
505 | |
506 | kfree(dev->ifalias); |
507 | kfree((char *)dev - dev->padded); |
508 | } |
509 | |
510 | static struct class net_class = { |
511 | .name = "net", |
512 | .dev_release = netdev_release, |
513 | #ifdef CONFIG_SYSFS |
514 | .dev_attrs = net_class_attributes, |
515 | #endif /* CONFIG_SYSFS */ |
516 | #ifdef CONFIG_HOTPLUG |
517 | .dev_uevent = netdev_uevent, |
518 | #endif |
519 | }; |
520 | |
521 | /* Delete sysfs entries but hold kobject reference until after all |
522 | * netdev references are gone. |
523 | */ |
524 | void netdev_unregister_kobject(struct net_device * net) |
525 | { |
526 | struct device *dev = &(net->dev); |
527 | |
528 | kobject_get(&dev->kobj); |
529 | |
530 | if (!net_eq(dev_net(net), &init_net)) |
531 | return; |
532 | |
533 | device_del(dev); |
534 | } |
535 | |
536 | /* Create sysfs entries for network device. */ |
537 | int netdev_register_kobject(struct net_device *net) |
538 | { |
539 | struct device *dev = &(net->dev); |
540 | const struct attribute_group **groups = net->sysfs_groups; |
541 | |
542 | dev->class = &net_class; |
543 | dev->platform_data = net; |
544 | dev->groups = groups; |
545 | |
546 | dev_set_name(dev, "%s", net->name); |
547 | |
548 | #ifdef CONFIG_SYSFS |
549 | /* Allow for a device specific group */ |
550 | if (*groups) |
551 | groups++; |
552 | |
553 | *groups++ = &netstat_group; |
554 | #ifdef CONFIG_WIRELESS_EXT_SYSFS |
555 | if (net->ieee80211_ptr) |
556 | *groups++ = &wireless_group; |
557 | #ifdef CONFIG_WIRELESS_EXT |
558 | else if (net->wireless_handlers) |
559 | *groups++ = &wireless_group; |
560 | #endif |
561 | #endif |
562 | #endif /* CONFIG_SYSFS */ |
563 | |
564 | if (!net_eq(dev_net(net), &init_net)) |
565 | return 0; |
566 | |
567 | return device_add(dev); |
568 | } |
569 | |
570 | int netdev_class_create_file(struct class_attribute *class_attr) |
571 | { |
572 | return class_create_file(&net_class, class_attr); |
573 | } |
574 | |
575 | void netdev_class_remove_file(struct class_attribute *class_attr) |
576 | { |
577 | class_remove_file(&net_class, class_attr); |
578 | } |
579 | |
580 | EXPORT_SYMBOL(netdev_class_create_file); |
581 | EXPORT_SYMBOL(netdev_class_remove_file); |
582 | |
583 | void netdev_initialize_kobject(struct net_device *net) |
584 | { |
585 | struct device *device = &(net->dev); |
586 | device_initialize(device); |
587 | } |
588 | |
589 | int netdev_kobject_init(void) |
590 | { |
591 | return class_register(&net_class); |
592 | } |
593 |
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jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9