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wext: Remove inline from get_priv_size() and adjust_priv_size().
[linux-2.6/btrfs-unstable.git] / net / wireless / wext.c
blobe83d74affd72c3744947f80631f518df7b71c315
1 /*
2 * This file implement the Wireless Extensions APIs.
3 *
4 * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
5 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
6 *
7 * (As all part of the Linux kernel, this file is GPL)
8 */
9
10 /************************** DOCUMENTATION **************************/
11 /*
12 * API definition :
13 * --------------
14 * See <linux/wireless.h> for details of the APIs and the rest.
15 *
16 * History :
17 * -------
18 *
19 * v1 - 5.12.01 - Jean II
20 * o Created this file.
21 *
22 * v2 - 13.12.01 - Jean II
23 * o Move /proc/net/wireless stuff from net/core/dev.c to here
24 * o Make Wireless Extension IOCTLs go through here
25 * o Added iw_handler handling ;-)
26 * o Added standard ioctl description
27 * o Initial dumb commit strategy based on orinoco.c
28 *
29 * v3 - 19.12.01 - Jean II
30 * o Make sure we don't go out of standard_ioctl[] in ioctl_standard_call
31 * o Add event dispatcher function
32 * o Add event description
33 * o Propagate events as rtnetlink IFLA_WIRELESS option
34 * o Generate event on selected SET requests
35 *
36 * v4 - 18.04.02 - Jean II
37 * o Fix stupid off by one in iw_ioctl_description : IW_ESSID_MAX_SIZE + 1
38 *
39 * v5 - 21.06.02 - Jean II
40 * o Add IW_PRIV_TYPE_ADDR in priv_type_size (+cleanup)
41 * o Reshuffle IW_HEADER_TYPE_XXX to map IW_PRIV_TYPE_XXX changes
42 * o Add IWEVCUSTOM for driver specific event/scanning token
43 * o Turn on WE_STRICT_WRITE by default + kernel warning
44 * o Fix WE_STRICT_WRITE in ioctl_export_private() (32 => iw_num)
45 * o Fix off-by-one in test (extra_size <= IFNAMSIZ)
46 *
47 * v6 - 9.01.03 - Jean II
48 * o Add common spy support : iw_handler_set_spy(), wireless_spy_update()
49 * o Add enhanced spy support : iw_handler_set_thrspy() and event.
50 * o Add WIRELESS_EXT version display in /proc/net/wireless
51 *
52 * v6 - 18.06.04 - Jean II
53 * o Change get_spydata() method for added safety
54 * o Remove spy #ifdef, they are always on -> cleaner code
55 * o Allow any size GET request if user specifies length > max
56 * and if request has IW_DESCR_FLAG_NOMAX flag or is SIOCGIWPRIV
57 * o Start migrating get_wireless_stats to struct iw_handler_def
58 * o Add wmb() in iw_handler_set_spy() for non-coherent archs/cpus
59 * Based on patch from Pavel Roskin <proski@gnu.org> :
60 * o Fix kernel data leak to user space in private handler handling
61 *
62 * v7 - 18.3.05 - Jean II
63 * o Remove (struct iw_point *)->pointer from events and streams
64 * o Remove spy_offset from struct iw_handler_def
65 * o Start deprecating dev->get_wireless_stats, output a warning
66 * o If IW_QUAL_DBM is set, show dBm values in /proc/net/wireless
67 * o Don't loose INVALID/DBM flags when clearing UPDATED flags (iwstats)
68 *
69 * v8 - 17.02.06 - Jean II
70 * o RtNetlink requests support (SET/GET)
71 *
72 * v8b - 03.08.06 - Herbert Xu
73 * o Fix Wireless Event locking issues.
74 *
75 * v9 - 14.3.06 - Jean II
76 * o Change length in ESSID and NICK to strlen() instead of strlen()+1
77 * o Make standard_ioctl_num and standard_event_num unsigned
78 * o Remove (struct net_device *)->get_wireless_stats()
79 *
80 * v10 - 16.3.07 - Jean II
81 * o Prevent leaking of kernel space in stream on 64 bits.
82 */
83
84 /***************************** INCLUDES *****************************/
85
86 #include <linux/module.h>
87 #include <linux/types.h> /* off_t */
88 #include <linux/netdevice.h> /* struct ifreq, dev_get_by_name() */
89 #include <linux/proc_fs.h>
90 #include <linux/rtnetlink.h> /* rtnetlink stuff */
91 #include <linux/seq_file.h>
92 #include <linux/init.h> /* for __init */
93 #include <linux/if_arp.h> /* ARPHRD_ETHER */
94 #include <linux/etherdevice.h> /* compare_ether_addr */
95 #include <linux/interrupt.h>
96 #include <net/net_namespace.h>
97
98 #include <linux/wireless.h> /* Pretty obvious */
99 #include <net/iw_handler.h> /* New driver API */
100 #include <net/netlink.h>
101 #include <net/wext.h>
102
103 #include <asm/uaccess.h> /* copy_to_user() */
104
105 /************************* GLOBAL VARIABLES *************************/
106 /*
107 * You should not use global variables, because of re-entrancy.
108 * On our case, it's only const, so it's OK...
109 */
110 /*
111 * Meta-data about all the standard Wireless Extension request we
112 * know about.
113 */
114 static const struct iw_ioctl_description standard_ioctl[] = {
115 [SIOCSIWCOMMIT - SIOCIWFIRST] = {
116 .header_type = IW_HEADER_TYPE_NULL,
117 },
118 [SIOCGIWNAME - SIOCIWFIRST] = {
119 .header_type = IW_HEADER_TYPE_CHAR,
120 .flags = IW_DESCR_FLAG_DUMP,
121 },
122 [SIOCSIWNWID - SIOCIWFIRST] = {
123 .header_type = IW_HEADER_TYPE_PARAM,
124 .flags = IW_DESCR_FLAG_EVENT,
125 },
126 [SIOCGIWNWID - SIOCIWFIRST] = {
127 .header_type = IW_HEADER_TYPE_PARAM,
128 .flags = IW_DESCR_FLAG_DUMP,
129 },
130 [SIOCSIWFREQ - SIOCIWFIRST] = {
131 .header_type = IW_HEADER_TYPE_FREQ,
132 .flags = IW_DESCR_FLAG_EVENT,
133 },
134 [SIOCGIWFREQ - SIOCIWFIRST] = {
135 .header_type = IW_HEADER_TYPE_FREQ,
136 .flags = IW_DESCR_FLAG_DUMP,
137 },
138 [SIOCSIWMODE - SIOCIWFIRST] = {
139 .header_type = IW_HEADER_TYPE_UINT,
140 .flags = IW_DESCR_FLAG_EVENT,
141 },
142 [SIOCGIWMODE - SIOCIWFIRST] = {
143 .header_type = IW_HEADER_TYPE_UINT,
144 .flags = IW_DESCR_FLAG_DUMP,
145 },
146 [SIOCSIWSENS - SIOCIWFIRST] = {
147 .header_type = IW_HEADER_TYPE_PARAM,
148 },
149 [SIOCGIWSENS - SIOCIWFIRST] = {
150 .header_type = IW_HEADER_TYPE_PARAM,
151 },
152 [SIOCSIWRANGE - SIOCIWFIRST] = {
153 .header_type = IW_HEADER_TYPE_NULL,
154 },
155 [SIOCGIWRANGE - SIOCIWFIRST] = {
156 .header_type = IW_HEADER_TYPE_POINT,
157 .token_size = 1,
158 .max_tokens = sizeof(struct iw_range),
159 .flags = IW_DESCR_FLAG_DUMP,
160 },
161 [SIOCSIWPRIV - SIOCIWFIRST] = {
162 .header_type = IW_HEADER_TYPE_NULL,
163 },
164 [SIOCGIWPRIV - SIOCIWFIRST] = { /* (handled directly by us) */
165 .header_type = IW_HEADER_TYPE_POINT,
166 .token_size = sizeof(struct iw_priv_args),
167 .max_tokens = 16,
168 .flags = IW_DESCR_FLAG_NOMAX,
169 },
170 [SIOCSIWSTATS - SIOCIWFIRST] = {
171 .header_type = IW_HEADER_TYPE_NULL,
172 },
173 [SIOCGIWSTATS - SIOCIWFIRST] = { /* (handled directly by us) */
174 .header_type = IW_HEADER_TYPE_POINT,
175 .token_size = 1,
176 .max_tokens = sizeof(struct iw_statistics),
177 .flags = IW_DESCR_FLAG_DUMP,
178 },
179 [SIOCSIWSPY - SIOCIWFIRST] = {
180 .header_type = IW_HEADER_TYPE_POINT,
181 .token_size = sizeof(struct sockaddr),
182 .max_tokens = IW_MAX_SPY,
183 },
184 [SIOCGIWSPY - SIOCIWFIRST] = {
185 .header_type = IW_HEADER_TYPE_POINT,
186 .token_size = sizeof(struct sockaddr) +
187 sizeof(struct iw_quality),
188 .max_tokens = IW_MAX_SPY,
189 },
190 [SIOCSIWTHRSPY - SIOCIWFIRST] = {
191 .header_type = IW_HEADER_TYPE_POINT,
192 .token_size = sizeof(struct iw_thrspy),
193 .min_tokens = 1,
194 .max_tokens = 1,
195 },
196 [SIOCGIWTHRSPY - SIOCIWFIRST] = {
197 .header_type = IW_HEADER_TYPE_POINT,
198 .token_size = sizeof(struct iw_thrspy),
199 .min_tokens = 1,
200 .max_tokens = 1,
201 },
202 [SIOCSIWAP - SIOCIWFIRST] = {
203 .header_type = IW_HEADER_TYPE_ADDR,
204 },
205 [SIOCGIWAP - SIOCIWFIRST] = {
206 .header_type = IW_HEADER_TYPE_ADDR,
207 .flags = IW_DESCR_FLAG_DUMP,
208 },
209 [SIOCSIWMLME - SIOCIWFIRST] = {
210 .header_type = IW_HEADER_TYPE_POINT,
211 .token_size = 1,
212 .min_tokens = sizeof(struct iw_mlme),
213 .max_tokens = sizeof(struct iw_mlme),
214 },
215 [SIOCGIWAPLIST - SIOCIWFIRST] = {
216 .header_type = IW_HEADER_TYPE_POINT,
217 .token_size = sizeof(struct sockaddr) +
218 sizeof(struct iw_quality),
219 .max_tokens = IW_MAX_AP,
220 .flags = IW_DESCR_FLAG_NOMAX,
221 },
222 [SIOCSIWSCAN - SIOCIWFIRST] = {
223 .header_type = IW_HEADER_TYPE_POINT,
224 .token_size = 1,
225 .min_tokens = 0,
226 .max_tokens = sizeof(struct iw_scan_req),
227 },
228 [SIOCGIWSCAN - SIOCIWFIRST] = {
229 .header_type = IW_HEADER_TYPE_POINT,
230 .token_size = 1,
231 .max_tokens = IW_SCAN_MAX_DATA,
232 .flags = IW_DESCR_FLAG_NOMAX,
233 },
234 [SIOCSIWESSID - SIOCIWFIRST] = {
235 .header_type = IW_HEADER_TYPE_POINT,
236 .token_size = 1,
237 .max_tokens = IW_ESSID_MAX_SIZE,
238 .flags = IW_DESCR_FLAG_EVENT,
239 },
240 [SIOCGIWESSID - SIOCIWFIRST] = {
241 .header_type = IW_HEADER_TYPE_POINT,
242 .token_size = 1,
243 .max_tokens = IW_ESSID_MAX_SIZE,
244 .flags = IW_DESCR_FLAG_DUMP,
245 },
246 [SIOCSIWNICKN - SIOCIWFIRST] = {
247 .header_type = IW_HEADER_TYPE_POINT,
248 .token_size = 1,
249 .max_tokens = IW_ESSID_MAX_SIZE,
250 },
251 [SIOCGIWNICKN - SIOCIWFIRST] = {
252 .header_type = IW_HEADER_TYPE_POINT,
253 .token_size = 1,
254 .max_tokens = IW_ESSID_MAX_SIZE,
255 },
256 [SIOCSIWRATE - SIOCIWFIRST] = {
257 .header_type = IW_HEADER_TYPE_PARAM,
258 },
259 [SIOCGIWRATE - SIOCIWFIRST] = {
260 .header_type = IW_HEADER_TYPE_PARAM,
261 },
262 [SIOCSIWRTS - SIOCIWFIRST] = {
263 .header_type = IW_HEADER_TYPE_PARAM,
264 },
265 [SIOCGIWRTS - SIOCIWFIRST] = {
266 .header_type = IW_HEADER_TYPE_PARAM,
267 },
268 [SIOCSIWFRAG - SIOCIWFIRST] = {
269 .header_type = IW_HEADER_TYPE_PARAM,
270 },
271 [SIOCGIWFRAG - SIOCIWFIRST] = {
272 .header_type = IW_HEADER_TYPE_PARAM,
273 },
274 [SIOCSIWTXPOW - SIOCIWFIRST] = {
275 .header_type = IW_HEADER_TYPE_PARAM,
276 },
277 [SIOCGIWTXPOW - SIOCIWFIRST] = {
278 .header_type = IW_HEADER_TYPE_PARAM,
279 },
280 [SIOCSIWRETRY - SIOCIWFIRST] = {
281 .header_type = IW_HEADER_TYPE_PARAM,
282 },
283 [SIOCGIWRETRY - SIOCIWFIRST] = {
284 .header_type = IW_HEADER_TYPE_PARAM,
285 },
286 [SIOCSIWENCODE - SIOCIWFIRST] = {
287 .header_type = IW_HEADER_TYPE_POINT,
288 .token_size = 1,
289 .max_tokens = IW_ENCODING_TOKEN_MAX,
290 .flags = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
291 },
292 [SIOCGIWENCODE - SIOCIWFIRST] = {
293 .header_type = IW_HEADER_TYPE_POINT,
294 .token_size = 1,
295 .max_tokens = IW_ENCODING_TOKEN_MAX,
296 .flags = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
297 },
298 [SIOCSIWPOWER - SIOCIWFIRST] = {
299 .header_type = IW_HEADER_TYPE_PARAM,
300 },
301 [SIOCGIWPOWER - SIOCIWFIRST] = {
302 .header_type = IW_HEADER_TYPE_PARAM,
303 },
304 [SIOCSIWGENIE - SIOCIWFIRST] = {
305 .header_type = IW_HEADER_TYPE_POINT,
306 .token_size = 1,
307 .max_tokens = IW_GENERIC_IE_MAX,
308 },
309 [SIOCGIWGENIE - SIOCIWFIRST] = {
310 .header_type = IW_HEADER_TYPE_POINT,
311 .token_size = 1,
312 .max_tokens = IW_GENERIC_IE_MAX,
313 },
314 [SIOCSIWAUTH - SIOCIWFIRST] = {
315 .header_type = IW_HEADER_TYPE_PARAM,
316 },
317 [SIOCGIWAUTH - SIOCIWFIRST] = {
318 .header_type = IW_HEADER_TYPE_PARAM,
319 },
320 [SIOCSIWENCODEEXT - SIOCIWFIRST] = {
321 .header_type = IW_HEADER_TYPE_POINT,
322 .token_size = 1,
323 .min_tokens = sizeof(struct iw_encode_ext),
324 .max_tokens = sizeof(struct iw_encode_ext) +
325 IW_ENCODING_TOKEN_MAX,
326 },
327 [SIOCGIWENCODEEXT - SIOCIWFIRST] = {
328 .header_type = IW_HEADER_TYPE_POINT,
329 .token_size = 1,
330 .min_tokens = sizeof(struct iw_encode_ext),
331 .max_tokens = sizeof(struct iw_encode_ext) +
332 IW_ENCODING_TOKEN_MAX,
333 },
334 [SIOCSIWPMKSA - SIOCIWFIRST] = {
335 .header_type = IW_HEADER_TYPE_POINT,
336 .token_size = 1,
337 .min_tokens = sizeof(struct iw_pmksa),
338 .max_tokens = sizeof(struct iw_pmksa),
339 },
340 };
341 static const unsigned standard_ioctl_num = ARRAY_SIZE(standard_ioctl);
342
343 /*
344 * Meta-data about all the additional standard Wireless Extension events
345 * we know about.
346 */
347 static const struct iw_ioctl_description standard_event[] = {
348 [IWEVTXDROP - IWEVFIRST] = {
349 .header_type = IW_HEADER_TYPE_ADDR,
350 },
351 [IWEVQUAL - IWEVFIRST] = {
352 .header_type = IW_HEADER_TYPE_QUAL,
353 },
354 [IWEVCUSTOM - IWEVFIRST] = {
355 .header_type = IW_HEADER_TYPE_POINT,
356 .token_size = 1,
357 .max_tokens = IW_CUSTOM_MAX,
358 },
359 [IWEVREGISTERED - IWEVFIRST] = {
360 .header_type = IW_HEADER_TYPE_ADDR,
361 },
362 [IWEVEXPIRED - IWEVFIRST] = {
363 .header_type = IW_HEADER_TYPE_ADDR,
364 },
365 [IWEVGENIE - IWEVFIRST] = {
366 .header_type = IW_HEADER_TYPE_POINT,
367 .token_size = 1,
368 .max_tokens = IW_GENERIC_IE_MAX,
369 },
370 [IWEVMICHAELMICFAILURE - IWEVFIRST] = {
371 .header_type = IW_HEADER_TYPE_POINT,
372 .token_size = 1,
373 .max_tokens = sizeof(struct iw_michaelmicfailure),
374 },
375 [IWEVASSOCREQIE - IWEVFIRST] = {
376 .header_type = IW_HEADER_TYPE_POINT,
377 .token_size = 1,
378 .max_tokens = IW_GENERIC_IE_MAX,
379 },
380 [IWEVASSOCRESPIE - IWEVFIRST] = {
381 .header_type = IW_HEADER_TYPE_POINT,
382 .token_size = 1,
383 .max_tokens = IW_GENERIC_IE_MAX,
384 },
385 [IWEVPMKIDCAND - IWEVFIRST] = {
386 .header_type = IW_HEADER_TYPE_POINT,
387 .token_size = 1,
388 .max_tokens = sizeof(struct iw_pmkid_cand),
389 },
390 };
391 static const unsigned standard_event_num = ARRAY_SIZE(standard_event);
392
393 /* Size (in bytes) of the various private data types */
394 static const char iw_priv_type_size[] = {
395 0, /* IW_PRIV_TYPE_NONE */
396 1, /* IW_PRIV_TYPE_BYTE */
397 1, /* IW_PRIV_TYPE_CHAR */
398 0, /* Not defined */
399 sizeof(__u32), /* IW_PRIV_TYPE_INT */
400 sizeof(struct iw_freq), /* IW_PRIV_TYPE_FLOAT */
401 sizeof(struct sockaddr), /* IW_PRIV_TYPE_ADDR */
402 0, /* Not defined */
403 };
404
405 /* Size (in bytes) of various events */
406 static const int event_type_size[] = {
407 IW_EV_LCP_LEN, /* IW_HEADER_TYPE_NULL */
408 0,
409 IW_EV_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
410 0,
411 IW_EV_UINT_LEN, /* IW_HEADER_TYPE_UINT */
412 IW_EV_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
413 IW_EV_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
414 0,
415 IW_EV_POINT_LEN, /* Without variable payload */
416 IW_EV_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
417 IW_EV_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
418 };
419
420
421 /************************ COMMON SUBROUTINES ************************/
422 /*
423 * Stuff that may be used in various place or doesn't fit in one
424 * of the section below.
425 */
426
427 /* ---------------------------------------------------------------- */
428 /*
429 * Return the driver handler associated with a specific Wireless Extension.
430 */
431 static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
432 {
433 /* Don't "optimise" the following variable, it will crash */
434 unsigned int index; /* *MUST* be unsigned */
435
436 /* Check if we have some wireless handlers defined */
437 if (dev->wireless_handlers == NULL)
438 return NULL;
439
440 /* Try as a standard command */
441 index = cmd - SIOCIWFIRST;
442 if (index < dev->wireless_handlers->num_standard)
443 return dev->wireless_handlers->standard[index];
444
445 /* Try as a private command */
446 index = cmd - SIOCIWFIRSTPRIV;
447 if (index < dev->wireless_handlers->num_private)
448 return dev->wireless_handlers->private[index];
449
450 /* Not found */
451 return NULL;
452 }
453
454 /* ---------------------------------------------------------------- */
455 /*
456 * Get statistics out of the driver
457 */
458 static struct iw_statistics *get_wireless_stats(struct net_device *dev)
459 {
460 /* New location */
461 if ((dev->wireless_handlers != NULL) &&
462 (dev->wireless_handlers->get_wireless_stats != NULL))
463 return dev->wireless_handlers->get_wireless_stats(dev);
464
465 /* Not found */
466 return NULL;
467 }
468
469 /* ---------------------------------------------------------------- */
470 /*
471 * Call the commit handler in the driver
472 * (if exist and if conditions are right)
473 *
474 * Note : our current commit strategy is currently pretty dumb,
475 * but we will be able to improve on that...
476 * The goal is to try to agreagate as many changes as possible
477 * before doing the commit. Drivers that will define a commit handler
478 * are usually those that need a reset after changing parameters, so
479 * we want to minimise the number of reset.
480 * A cool idea is to use a timer : at each "set" command, we re-set the
481 * timer, when the timer eventually fires, we call the driver.
482 * Hopefully, more on that later.
483 *
484 * Also, I'm waiting to see how many people will complain about the
485 * netif_running(dev) test. I'm open on that one...
486 * Hopefully, the driver will remember to do a commit in "open()" ;-)
487 */
488 static int call_commit_handler(struct net_device *dev)
489 {
490 if ((netif_running(dev)) &&
491 (dev->wireless_handlers->standard[0] != NULL))
492 /* Call the commit handler on the driver */
493 return dev->wireless_handlers->standard[0](dev, NULL,
494 NULL, NULL);
495 else
496 return 0; /* Command completed successfully */
497 }
498
499 /* ---------------------------------------------------------------- */
500 /*
501 * Calculate size of private arguments
502 */
503 static int get_priv_size(__u16 args)
504 {
505 int num = args & IW_PRIV_SIZE_MASK;
506 int type = (args & IW_PRIV_TYPE_MASK) >> 12;
507
508 return num * iw_priv_type_size[type];
509 }
510
511 /* ---------------------------------------------------------------- */
512 /*
513 * Re-calculate the size of private arguments
514 */
515 static int adjust_priv_size(__u16 args, union iwreq_data *wrqu)
516 {
517 int num = wrqu->data.length;
518 int max = args & IW_PRIV_SIZE_MASK;
519 int type = (args & IW_PRIV_TYPE_MASK) >> 12;
520
521 /* Make sure the driver doesn't goof up */
522 if (max < num)
523 num = max;
524
525 return num * iw_priv_type_size[type];
526 }
527
528 /* ---------------------------------------------------------------- */
529 /*
530 * Standard Wireless Handler : get wireless stats
531 * Allow programatic access to /proc/net/wireless even if /proc
532 * doesn't exist... Also more efficient...
533 */
534 static int iw_handler_get_iwstats(struct net_device * dev,
535 struct iw_request_info * info,
536 union iwreq_data * wrqu,
537 char * extra)
538 {
539 /* Get stats from the driver */
540 struct iw_statistics *stats;
541
542 stats = get_wireless_stats(dev);
543 if (stats) {
544 /* Copy statistics to extra */
545 memcpy(extra, stats, sizeof(struct iw_statistics));
546 wrqu->data.length = sizeof(struct iw_statistics);
547
548 /* Check if we need to clear the updated flag */
549 if (wrqu->data.flags != 0)
550 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
551 return 0;
552 } else
553 return -EOPNOTSUPP;
554 }
555
556 /* ---------------------------------------------------------------- */
557 /*
558 * Standard Wireless Handler : get iwpriv definitions
559 * Export the driver private handler definition
560 * They will be picked up by tools like iwpriv...
561 */
562 static int iw_handler_get_private(struct net_device * dev,
563 struct iw_request_info * info,
564 union iwreq_data * wrqu,
565 char * extra)
566 {
567 /* Check if the driver has something to export */
568 if ((dev->wireless_handlers->num_private_args == 0) ||
569 (dev->wireless_handlers->private_args == NULL))
570 return -EOPNOTSUPP;
571
572 /* Check if there is enough buffer up there */
573 if (wrqu->data.length < dev->wireless_handlers->num_private_args) {
574 /* User space can't know in advance how large the buffer
575 * needs to be. Give it a hint, so that we can support
576 * any size buffer we want somewhat efficiently... */
577 wrqu->data.length = dev->wireless_handlers->num_private_args;
578 return -E2BIG;
579 }
580
581 /* Set the number of available ioctls. */
582 wrqu->data.length = dev->wireless_handlers->num_private_args;
583
584 /* Copy structure to the user buffer. */
585 memcpy(extra, dev->wireless_handlers->private_args,
586 sizeof(struct iw_priv_args) * wrqu->data.length);
587
588 return 0;
589 }
590
591
592 /******************** /proc/net/wireless SUPPORT ********************/
593 /*
594 * The /proc/net/wireless file is a human readable user-space interface
595 * exporting various wireless specific statistics from the wireless devices.
596 * This is the most popular part of the Wireless Extensions ;-)
597 *
598 * This interface is a pure clone of /proc/net/dev (in net/core/dev.c).
599 * The content of the file is basically the content of "struct iw_statistics".
600 */
601
602 #ifdef CONFIG_PROC_FS
603
604 /* ---------------------------------------------------------------- */
605 /*
606 * Print one entry (line) of /proc/net/wireless
607 */
608 static void wireless_seq_printf_stats(struct seq_file *seq,
609 struct net_device *dev)
610 {
611 /* Get stats from the driver */
612 struct iw_statistics *stats = get_wireless_stats(dev);
613
614 if (stats) {
615 seq_printf(seq, "%6s: %04x %3d%c %3d%c %3d%c %6d %6d %6d "
616 "%6d %6d %6d\n",
617 dev->name, stats->status, stats->qual.qual,
618 stats->qual.updated & IW_QUAL_QUAL_UPDATED
619 ? '.' : ' ',
620 ((__s32) stats->qual.level) -
621 ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
622 stats->qual.updated & IW_QUAL_LEVEL_UPDATED
623 ? '.' : ' ',
624 ((__s32) stats->qual.noise) -
625 ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
626 stats->qual.updated & IW_QUAL_NOISE_UPDATED
627 ? '.' : ' ',
628 stats->discard.nwid, stats->discard.code,
629 stats->discard.fragment, stats->discard.retries,
630 stats->discard.misc, stats->miss.beacon);
631 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
632 }
633 }
634
635 /* ---------------------------------------------------------------- */
636 /*
637 * Print info for /proc/net/wireless (print all entries)
638 */
639 static int wireless_seq_show(struct seq_file *seq, void *v)
640 {
641 if (v == SEQ_START_TOKEN)
642 seq_printf(seq, "Inter-| sta-| Quality | Discarded "
643 "packets | Missed | WE\n"
644 " face | tus | link level noise | nwid "
645 "crypt frag retry misc | beacon | %d\n",
646 WIRELESS_EXT);
647 else
648 wireless_seq_printf_stats(seq, v);
649 return 0;
650 }
651
652 static const struct seq_operations wireless_seq_ops = {
653 .start = dev_seq_start,
654 .next = dev_seq_next,
655 .stop = dev_seq_stop,
656 .show = wireless_seq_show,
657 };
658
659 static int wireless_seq_open(struct inode *inode, struct file *file)
660 {
661 return seq_open_net(inode, file, &wireless_seq_ops,
662 sizeof(struct seq_net_private));
663 }
664
665 static const struct file_operations wireless_seq_fops = {
666 .owner = THIS_MODULE,
667 .open = wireless_seq_open,
668 .read = seq_read,
669 .llseek = seq_lseek,
670 .release = seq_release_net,
671 };
672
673 int wext_proc_init(struct net *net)
674 {
675 /* Create /proc/net/wireless entry */
676 if (!proc_net_fops_create(net, "wireless", S_IRUGO, &wireless_seq_fops))
677 return -ENOMEM;
678
679 return 0;
680 }
681
682 void wext_proc_exit(struct net *net)
683 {
684 proc_net_remove(net, "wireless");
685 }
686 #endif /* CONFIG_PROC_FS */
687
688 /************************** IOCTL SUPPORT **************************/
689 /*
690 * The original user space API to configure all those Wireless Extensions
691 * is through IOCTLs.
692 * In there, we check if we need to call the new driver API (iw_handler)
693 * or just call the driver ioctl handler.
694 */
695
696 /* ---------------------------------------------------------------- */
697 /*
698 * Wrapper to call a standard Wireless Extension handler.
699 * We do various checks and also take care of moving data between
700 * user space and kernel space.
701 */
702 static int ioctl_standard_call(struct net_device * dev,
703 struct ifreq * ifr,
704 unsigned int cmd,
705 iw_handler handler)
706 {
707 struct iwreq * iwr = (struct iwreq *) ifr;
708 const struct iw_ioctl_description * descr;
709 struct iw_request_info info;
710 int ret = -EINVAL;
711
712 /* Get the description of the IOCTL */
713 if ((cmd - SIOCIWFIRST) >= standard_ioctl_num)
714 return -EOPNOTSUPP;
715 descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
716
717 /* Prepare the call */
718 info.cmd = cmd;
719 info.flags = 0;
720
721 /* Check if we have a pointer to user space data or not */
722 if (descr->header_type != IW_HEADER_TYPE_POINT) {
723
724 /* No extra arguments. Trivial to handle */
725 ret = handler(dev, &info, &(iwr->u), NULL);
726
727 /* Generate an event to notify listeners of the change */
728 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
729 ((ret == 0) || (ret == -EIWCOMMIT)))
730 wireless_send_event(dev, cmd, &(iwr->u), NULL);
731 } else {
732 char * extra;
733 int extra_size;
734 int user_length = 0;
735 int err;
736 int essid_compat = 0;
737
738 /* Calculate space needed by arguments. Always allocate
739 * for max space. Easier, and won't last long... */
740 extra_size = descr->max_tokens * descr->token_size;
741
742 /* Check need for ESSID compatibility for WE < 21 */
743 switch (cmd) {
744 case SIOCSIWESSID:
745 case SIOCGIWESSID:
746 case SIOCSIWNICKN:
747 case SIOCGIWNICKN:
748 if (iwr->u.data.length == descr->max_tokens + 1)
749 essid_compat = 1;
750 else if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
751 char essid[IW_ESSID_MAX_SIZE + 1];
752
753 err = copy_from_user(essid, iwr->u.data.pointer,
754 iwr->u.data.length *
755 descr->token_size);
756 if (err)
757 return -EFAULT;
758
759 if (essid[iwr->u.data.length - 1] == '\0')
760 essid_compat = 1;
761 }
762 break;
763 default:
764 break;
765 }
766
767 iwr->u.data.length -= essid_compat;
768
769 /* Check what user space is giving us */
770 if (IW_IS_SET(cmd)) {
771 /* Check NULL pointer */
772 if ((iwr->u.data.pointer == NULL) &&
773 (iwr->u.data.length != 0))
774 return -EFAULT;
775 /* Check if number of token fits within bounds */
776 if (iwr->u.data.length > descr->max_tokens)
777 return -E2BIG;
778 if (iwr->u.data.length < descr->min_tokens)
779 return -EINVAL;
780 } else {
781 /* Check NULL pointer */
782 if (iwr->u.data.pointer == NULL)
783 return -EFAULT;
784 /* Save user space buffer size for checking */
785 user_length = iwr->u.data.length;
786
787 /* Don't check if user_length > max to allow forward
788 * compatibility. The test user_length < min is
789 * implied by the test at the end. */
790
791 /* Support for very large requests */
792 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
793 (user_length > descr->max_tokens)) {
794 /* Allow userspace to GET more than max so
795 * we can support any size GET requests.
796 * There is still a limit : -ENOMEM. */
797 extra_size = user_length * descr->token_size;
798 /* Note : user_length is originally a __u16,
799 * and token_size is controlled by us,
800 * so extra_size won't get negative and
801 * won't overflow... */
802 }
803 }
804
805 /* Create the kernel buffer */
806 /* kzalloc ensures NULL-termination for essid_compat */
807 extra = kzalloc(extra_size, GFP_KERNEL);
808 if (extra == NULL)
809 return -ENOMEM;
810
811 /* If it is a SET, get all the extra data in here */
812 if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
813 err = copy_from_user(extra, iwr->u.data.pointer,
814 iwr->u.data.length *
815 descr->token_size);
816 if (err) {
817 kfree(extra);
818 return -EFAULT;
819 }
820 }
821
822 /* Call the handler */
823 ret = handler(dev, &info, &(iwr->u), extra);
824
825 iwr->u.data.length += essid_compat;
826
827 /* If we have something to return to the user */
828 if (!ret && IW_IS_GET(cmd)) {
829 /* Check if there is enough buffer up there */
830 if (user_length < iwr->u.data.length) {
831 kfree(extra);
832 return -E2BIG;
833 }
834
835 err = copy_to_user(iwr->u.data.pointer, extra,
836 iwr->u.data.length *
837 descr->token_size);
838 if (err)
839 ret = -EFAULT;
840 }
841
842 /* Generate an event to notify listeners of the change */
843 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
844 ((ret == 0) || (ret == -EIWCOMMIT))) {
845 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
846 /* If the event is restricted, don't
847 * export the payload */
848 wireless_send_event(dev, cmd, &(iwr->u), NULL);
849 else
850 wireless_send_event(dev, cmd, &(iwr->u),
851 extra);
852 }
853
854 /* Cleanup - I told you it wasn't that long ;-) */
855 kfree(extra);
856 }
857
858 /* Call commit handler if needed and defined */
859 if (ret == -EIWCOMMIT)
860 ret = call_commit_handler(dev);
861
862 /* Here, we will generate the appropriate event if needed */
863
864 return ret;
865 }
866
867 /* ---------------------------------------------------------------- */
868 /*
869 * Wrapper to call a private Wireless Extension handler.
870 * We do various checks and also take care of moving data between
871 * user space and kernel space.
872 * It's not as nice and slimline as the standard wrapper. The cause
873 * is struct iw_priv_args, which was not really designed for the
874 * job we are going here.
875 *
876 * IMPORTANT : This function prevent to set and get data on the same
877 * IOCTL and enforce the SET/GET convention. Not doing it would be
878 * far too hairy...
879 * If you need to set and get data at the same time, please don't use
880 * a iw_handler but process it in your ioctl handler (i.e. use the
881 * old driver API).
882 */
883 static int ioctl_private_call(struct net_device *dev, struct ifreq *ifr,
884 unsigned int cmd, iw_handler handler)
885 {
886 struct iwreq * iwr = (struct iwreq *) ifr;
887 const struct iw_priv_args * descr = NULL;
888 struct iw_request_info info;
889 int extra_size = 0;
890 int i;
891 int ret = -EINVAL;
892
893 /* Get the description of the IOCTL */
894 for (i = 0; i < dev->wireless_handlers->num_private_args; i++)
895 if (cmd == dev->wireless_handlers->private_args[i].cmd) {
896 descr = &(dev->wireless_handlers->private_args[i]);
897 break;
898 }
899
900 /* Compute the size of the set/get arguments */
901 if (descr != NULL) {
902 if (IW_IS_SET(cmd)) {
903 int offset = 0; /* For sub-ioctls */
904 /* Check for sub-ioctl handler */
905 if (descr->name[0] == '\0')
906 /* Reserve one int for sub-ioctl index */
907 offset = sizeof(__u32);
908
909 /* Size of set arguments */
910 extra_size = get_priv_size(descr->set_args);
911
912 /* Does it fits in iwr ? */
913 if ((descr->set_args & IW_PRIV_SIZE_FIXED) &&
914 ((extra_size + offset) <= IFNAMSIZ))
915 extra_size = 0;
916 } else {
917 /* Size of get arguments */
918 extra_size = get_priv_size(descr->get_args);
919
920 /* Does it fits in iwr ? */
921 if ((descr->get_args & IW_PRIV_SIZE_FIXED) &&
922 (extra_size <= IFNAMSIZ))
923 extra_size = 0;
924 }
925 }
926
927 /* Prepare the call */
928 info.cmd = cmd;
929 info.flags = 0;
930
931 /* Check if we have a pointer to user space data or not. */
932 if (extra_size == 0) {
933 /* No extra arguments. Trivial to handle */
934 ret = handler(dev, &info, &(iwr->u), (char *) &(iwr->u));
935 } else {
936 char * extra;
937 int err;
938
939 /* Check what user space is giving us */
940 if (IW_IS_SET(cmd)) {
941 /* Check NULL pointer */
942 if ((iwr->u.data.pointer == NULL) &&
943 (iwr->u.data.length != 0))
944 return -EFAULT;
945
946 /* Does it fits within bounds ? */
947 if (iwr->u.data.length > (descr->set_args &
948 IW_PRIV_SIZE_MASK))
949 return -E2BIG;
950 } else if (iwr->u.data.pointer == NULL)
951 return -EFAULT;
952
953 /* Always allocate for max space. Easier, and won't last
954 * long... */
955 extra = kmalloc(extra_size, GFP_KERNEL);
956 if (extra == NULL)
957 return -ENOMEM;
958
959 /* If it is a SET, get all the extra data in here */
960 if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
961 err = copy_from_user(extra, iwr->u.data.pointer,
962 extra_size);
963 if (err) {
964 kfree(extra);
965 return -EFAULT;
966 }
967 }
968
969 /* Call the handler */
970 ret = handler(dev, &info, &(iwr->u), extra);
971
972 /* If we have something to return to the user */
973 if (!ret && IW_IS_GET(cmd)) {
974
975 /* Adjust for the actual length if it's variable,
976 * avoid leaking kernel bits outside. */
977 if (!(descr->get_args & IW_PRIV_SIZE_FIXED)) {
978 extra_size = adjust_priv_size(descr->get_args,
979 &(iwr->u));
980 }
981
982 err = copy_to_user(iwr->u.data.pointer, extra,
983 extra_size);
984 if (err)
985 ret = -EFAULT;
986 }
987
988 /* Cleanup - I told you it wasn't that long ;-) */
989 kfree(extra);
990 }
991
992
993 /* Call commit handler if needed and defined */
994 if (ret == -EIWCOMMIT)
995 ret = call_commit_handler(dev);
996
997 return ret;
998 }
999
1000 /* ---------------------------------------------------------------- */
1001 /*
1002 * Main IOCTl dispatcher.
1003 * Check the type of IOCTL and call the appropriate wrapper...
1004 */
1005 static int wireless_process_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd)
1006 {
1007 struct net_device *dev;
1008 iw_handler handler;
1009
1010 /* Permissions are already checked in dev_ioctl() before calling us.
1011 * The copy_to/from_user() of ifr is also dealt with in there */
1012
1013 /* Make sure the device exist */
1014 if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL)
1015 return -ENODEV;
1016
1017 /* A bunch of special cases, then the generic case...
1018 * Note that 'cmd' is already filtered in dev_ioctl() with
1019 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
1020 if (cmd == SIOCGIWSTATS)
1021 return ioctl_standard_call(dev, ifr, cmd,
1022 &iw_handler_get_iwstats);
1023
1024 if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
1025 return ioctl_standard_call(dev, ifr, cmd,
1026 &iw_handler_get_private);
1027
1028 /* Basic check */
1029 if (!netif_device_present(dev))
1030 return -ENODEV;
1031
1032 /* New driver API : try to find the handler */
1033 handler = get_handler(dev, cmd);
1034 if (handler) {
1035 /* Standard and private are not the same */
1036 if (cmd < SIOCIWFIRSTPRIV)
1037 return ioctl_standard_call(dev, ifr, cmd, handler);
1038 else
1039 return ioctl_private_call(dev, ifr, cmd, handler);
1040 }
1041 /* Old driver API : call driver ioctl handler */
1042 if (dev->do_ioctl)
1043 return dev->do_ioctl(dev, ifr, cmd);
1044 return -EOPNOTSUPP;
1045 }
1046
1047 /* entry point from dev ioctl */
1048 int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
1049 void __user *arg)
1050 {
1051 int ret;
1052
1053 /* If command is `set a parameter', or
1054 * `get the encoding parameters', check if
1055 * the user has the right to do it */
1056 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE || cmd == SIOCGIWENCODEEXT)
1057 && !capable(CAP_NET_ADMIN))
1058 return -EPERM;
1059
1060 dev_load(net, ifr->ifr_name);
1061 rtnl_lock();
1062 ret = wireless_process_ioctl(net, ifr, cmd);
1063 rtnl_unlock();
1064 if (IW_IS_GET(cmd) && copy_to_user(arg, ifr, sizeof(struct iwreq)))
1065 return -EFAULT;
1066 return ret;
1067 }
1068
1069 /************************* EVENT PROCESSING *************************/
1070 /*
1071 * Process events generated by the wireless layer or the driver.
1072 * Most often, the event will be propagated through rtnetlink
1073 */
1074
1075 /* ---------------------------------------------------------------- */
1076 /*
1077 * Locking...
1078 * ----------
1079 *
1080 * Thanks to Herbert Xu <herbert@gondor.apana.org.au> for fixing
1081 * the locking issue in here and implementing this code !
1082 *
1083 * The issue : wireless_send_event() is often called in interrupt context,
1084 * while the Netlink layer can never be called in interrupt context.
1085 * The fully formed RtNetlink events are queued, and then a tasklet is run
1086 * to feed those to Netlink.
1087 * The skb_queue is interrupt safe, and its lock is not held while calling
1088 * Netlink, so there is no possibility of dealock.
1089 * Jean II
1090 */
1091
1092 static struct sk_buff_head wireless_nlevent_queue;
1093
1094 static int __init wireless_nlevent_init(void)
1095 {
1096 skb_queue_head_init(&wireless_nlevent_queue);
1097 return 0;
1098 }
1099
1100 subsys_initcall(wireless_nlevent_init);
1101
1102 static void wireless_nlevent_process(unsigned long data)
1103 {
1104 struct sk_buff *skb;
1105
1106 while ((skb = skb_dequeue(&wireless_nlevent_queue)))
1107 rtnl_notify(skb, &init_net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
1108 }
1109
1110 static DECLARE_TASKLET(wireless_nlevent_tasklet, wireless_nlevent_process, 0);
1111
1112 /* ---------------------------------------------------------------- */
1113 /*
1114 * Fill a rtnetlink message with our event data.
1115 * Note that we propage only the specified event and don't dump the
1116 * current wireless config. Dumping the wireless config is far too
1117 * expensive (for each parameter, the driver need to query the hardware).
1118 */
1119 static int rtnetlink_fill_iwinfo(struct sk_buff *skb, struct net_device *dev,
1120 int type, char *event, int event_len)
1121 {
1122 struct ifinfomsg *r;
1123 struct nlmsghdr *nlh;
1124
1125 nlh = nlmsg_put(skb, 0, 0, type, sizeof(*r), 0);
1126 if (nlh == NULL)
1127 return -EMSGSIZE;
1128
1129 r = nlmsg_data(nlh);
1130 r->ifi_family = AF_UNSPEC;
1131 r->__ifi_pad = 0;
1132 r->ifi_type = dev->type;
1133 r->ifi_index = dev->ifindex;
1134 r->ifi_flags = dev_get_flags(dev);
1135 r->ifi_change = 0; /* Wireless changes don't affect those flags */
1136
1137 /* Add the wireless events in the netlink packet */
1138 NLA_PUT(skb, IFLA_WIRELESS, event_len, event);
1139
1140 return nlmsg_end(skb, nlh);
1141
1142 nla_put_failure:
1143 nlmsg_cancel(skb, nlh);
1144 return -EMSGSIZE;
1145 }
1146
1147 /* ---------------------------------------------------------------- */
1148 /*
1149 * Create and broadcast and send it on the standard rtnetlink socket
1150 * This is a pure clone rtmsg_ifinfo() in net/core/rtnetlink.c
1151 * Andrzej Krzysztofowicz mandated that I used a IFLA_XXX field
1152 * within a RTM_NEWLINK event.
1153 */
1154 static void rtmsg_iwinfo(struct net_device *dev, char *event, int event_len)
1155 {
1156 struct sk_buff *skb;
1157 int err;
1158
1159 if (dev_net(dev) != &init_net)
1160 return;
1161
1162 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1163 if (!skb)
1164 return;
1165
1166 err = rtnetlink_fill_iwinfo(skb, dev, RTM_NEWLINK, event, event_len);
1167 if (err < 0) {
1168 WARN_ON(err == -EMSGSIZE);
1169 kfree_skb(skb);
1170 return;
1171 }
1172
1173 NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
1174 skb_queue_tail(&wireless_nlevent_queue, skb);
1175 tasklet_schedule(&wireless_nlevent_tasklet);
1176 }
1177
1178 /* ---------------------------------------------------------------- */
1179 /*
1180 * Main event dispatcher. Called from other parts and drivers.
1181 * Send the event on the appropriate channels.
1182 * May be called from interrupt context.
1183 */
1184 void wireless_send_event(struct net_device * dev,
1185 unsigned int cmd,
1186 union iwreq_data * wrqu,
1187 char * extra)
1188 {
1189 const struct iw_ioctl_description * descr = NULL;
1190 int extra_len = 0;
1191 struct iw_event *event; /* Mallocated whole event */
1192 int event_len; /* Its size */
1193 int hdr_len; /* Size of the event header */
1194 int wrqu_off = 0; /* Offset in wrqu */
1195 /* Don't "optimise" the following variable, it will crash */
1196 unsigned cmd_index; /* *MUST* be unsigned */
1197
1198 /* Get the description of the Event */
1199 if (cmd <= SIOCIWLAST) {
1200 cmd_index = cmd - SIOCIWFIRST;
1201 if (cmd_index < standard_ioctl_num)
1202 descr = &(standard_ioctl[cmd_index]);
1203 } else {
1204 cmd_index = cmd - IWEVFIRST;
1205 if (cmd_index < standard_event_num)
1206 descr = &(standard_event[cmd_index]);
1207 }
1208 /* Don't accept unknown events */
1209 if (descr == NULL) {
1210 /* Note : we don't return an error to the driver, because
1211 * the driver would not know what to do about it. It can't
1212 * return an error to the user, because the event is not
1213 * initiated by a user request.
1214 * The best the driver could do is to log an error message.
1215 * We will do it ourselves instead...
1216 */
1217 printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
1218 dev->name, cmd);
1219 return;
1220 }
1221
1222 /* Check extra parameters and set extra_len */
1223 if (descr->header_type == IW_HEADER_TYPE_POINT) {
1224 /* Check if number of token fits within bounds */
1225 if (wrqu->data.length > descr->max_tokens) {
1226 printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length);
1227 return;
1228 }
1229 if (wrqu->data.length < descr->min_tokens) {
1230 printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, wrqu->data.length);
1231 return;
1232 }
1233 /* Calculate extra_len - extra is NULL for restricted events */
1234 if (extra != NULL)
1235 extra_len = wrqu->data.length * descr->token_size;
1236 /* Always at an offset in wrqu */
1237 wrqu_off = IW_EV_POINT_OFF;
1238 }
1239
1240 /* Total length of the event */
1241 hdr_len = event_type_size[descr->header_type];
1242 event_len = hdr_len + extra_len;
1243
1244 /* Create temporary buffer to hold the event */
1245 event = kmalloc(event_len, GFP_ATOMIC);
1246 if (event == NULL)
1247 return;
1248
1249 /* Fill event */
1250 event->len = event_len;
1251 event->cmd = cmd;
1252 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
1253 if (extra)
1254 memcpy(((char *) event) + hdr_len, extra, extra_len);
1255
1256 /* Send via the RtNetlink event channel */
1257 rtmsg_iwinfo(dev, (char *) event, event_len);
1258
1259 /* Cleanup */
1260 kfree(event);
1261
1262 return; /* Always success, I guess ;-) */
1263 }
1264 EXPORT_SYMBOL(wireless_send_event);
1265
1266 /********************** ENHANCED IWSPY SUPPORT **********************/
1267 /*
1268 * In the old days, the driver was handling spy support all by itself.
1269 * Now, the driver can delegate this task to Wireless Extensions.
1270 * It needs to use those standard spy iw_handler in struct iw_handler_def,
1271 * push data to us via wireless_spy_update() and include struct iw_spy_data
1272 * in its private part (and export it in net_device->wireless_data->spy_data).
1273 * One of the main advantage of centralising spy support here is that
1274 * it becomes much easier to improve and extend it without having to touch
1275 * the drivers. One example is the addition of the Spy-Threshold events.
1276 */
1277
1278 /* ---------------------------------------------------------------- */
1279 /*
1280 * Return the pointer to the spy data in the driver.
1281 * Because this is called on the Rx path via wireless_spy_update(),
1282 * we want it to be efficient...
1283 */
1284 static inline struct iw_spy_data *get_spydata(struct net_device *dev)
1285 {
1286 /* This is the new way */
1287 if (dev->wireless_data)
1288 return dev->wireless_data->spy_data;
1289 return NULL;
1290 }
1291
1292 /*------------------------------------------------------------------*/
1293 /*
1294 * Standard Wireless Handler : set Spy List
1295 */
1296 int iw_handler_set_spy(struct net_device * dev,
1297 struct iw_request_info * info,
1298 union iwreq_data * wrqu,
1299 char * extra)
1300 {
1301 struct iw_spy_data * spydata = get_spydata(dev);
1302 struct sockaddr * address = (struct sockaddr *) extra;
1303
1304 /* Make sure driver is not buggy or using the old API */
1305 if (!spydata)
1306 return -EOPNOTSUPP;
1307
1308 /* Disable spy collection while we copy the addresses.
1309 * While we copy addresses, any call to wireless_spy_update()
1310 * will NOP. This is OK, as anyway the addresses are changing. */
1311 spydata->spy_number = 0;
1312
1313 /* We want to operate without locking, because wireless_spy_update()
1314 * most likely will happen in the interrupt handler, and therefore
1315 * have its own locking constraints and needs performance.
1316 * The rtnl_lock() make sure we don't race with the other iw_handlers.
1317 * This make sure wireless_spy_update() "see" that the spy list
1318 * is temporarily disabled. */
1319 smp_wmb();
1320
1321 /* Are there are addresses to copy? */
1322 if (wrqu->data.length > 0) {
1323 int i;
1324
1325 /* Copy addresses */
1326 for (i = 0; i < wrqu->data.length; i++)
1327 memcpy(spydata->spy_address[i], address[i].sa_data,
1328 ETH_ALEN);
1329 /* Reset stats */
1330 memset(spydata->spy_stat, 0,
1331 sizeof(struct iw_quality) * IW_MAX_SPY);
1332 }
1333
1334 /* Make sure above is updated before re-enabling */
1335 smp_wmb();
1336
1337 /* Enable addresses */
1338 spydata->spy_number = wrqu->data.length;
1339
1340 return 0;
1341 }
1342 EXPORT_SYMBOL(iw_handler_set_spy);
1343
1344 /*------------------------------------------------------------------*/
1345 /*
1346 * Standard Wireless Handler : get Spy List
1347 */
1348 int iw_handler_get_spy(struct net_device * dev,
1349 struct iw_request_info * info,
1350 union iwreq_data * wrqu,
1351 char * extra)
1352 {
1353 struct iw_spy_data * spydata = get_spydata(dev);
1354 struct sockaddr * address = (struct sockaddr *) extra;
1355 int i;
1356
1357 /* Make sure driver is not buggy or using the old API */
1358 if (!spydata)
1359 return -EOPNOTSUPP;
1360
1361 wrqu->data.length = spydata->spy_number;
1362
1363 /* Copy addresses. */
1364 for (i = 0; i < spydata->spy_number; i++) {
1365 memcpy(address[i].sa_data, spydata->spy_address[i], ETH_ALEN);
1366 address[i].sa_family = AF_UNIX;
1367 }
1368 /* Copy stats to the user buffer (just after). */
1369 if (spydata->spy_number > 0)
1370 memcpy(extra + (sizeof(struct sockaddr) *spydata->spy_number),
1371 spydata->spy_stat,
1372 sizeof(struct iw_quality) * spydata->spy_number);
1373 /* Reset updated flags. */
1374 for (i = 0; i < spydata->spy_number; i++)
1375 spydata->spy_stat[i].updated &= ~IW_QUAL_ALL_UPDATED;
1376 return 0;
1377 }
1378 EXPORT_SYMBOL(iw_handler_get_spy);
1379
1380 /*------------------------------------------------------------------*/
1381 /*
1382 * Standard Wireless Handler : set spy threshold
1383 */
1384 int iw_handler_set_thrspy(struct net_device * dev,
1385 struct iw_request_info *info,
1386 union iwreq_data * wrqu,
1387 char * extra)
1388 {
1389 struct iw_spy_data * spydata = get_spydata(dev);
1390 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
1391
1392 /* Make sure driver is not buggy or using the old API */
1393 if (!spydata)
1394 return -EOPNOTSUPP;
1395
1396 /* Just do it */
1397 memcpy(&(spydata->spy_thr_low), &(threshold->low),
1398 2 * sizeof(struct iw_quality));
1399
1400 /* Clear flag */
1401 memset(spydata->spy_thr_under, '\0', sizeof(spydata->spy_thr_under));
1402
1403 return 0;
1404 }
1405 EXPORT_SYMBOL(iw_handler_set_thrspy);
1406
1407 /*------------------------------------------------------------------*/
1408 /*
1409 * Standard Wireless Handler : get spy threshold
1410 */
1411 int iw_handler_get_thrspy(struct net_device * dev,
1412 struct iw_request_info *info,
1413 union iwreq_data * wrqu,
1414 char * extra)
1415 {
1416 struct iw_spy_data * spydata = get_spydata(dev);
1417 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
1418
1419 /* Make sure driver is not buggy or using the old API */
1420 if (!spydata)
1421 return -EOPNOTSUPP;
1422
1423 /* Just do it */
1424 memcpy(&(threshold->low), &(spydata->spy_thr_low),
1425 2 * sizeof(struct iw_quality));
1426
1427 return 0;
1428 }
1429 EXPORT_SYMBOL(iw_handler_get_thrspy);
1430
1431 /*------------------------------------------------------------------*/
1432 /*
1433 * Prepare and send a Spy Threshold event
1434 */
1435 static void iw_send_thrspy_event(struct net_device * dev,
1436 struct iw_spy_data * spydata,
1437 unsigned char * address,
1438 struct iw_quality * wstats)
1439 {
1440 union iwreq_data wrqu;
1441 struct iw_thrspy threshold;
1442
1443 /* Init */
1444 wrqu.data.length = 1;
1445 wrqu.data.flags = 0;
1446 /* Copy address */
1447 memcpy(threshold.addr.sa_data, address, ETH_ALEN);
1448 threshold.addr.sa_family = ARPHRD_ETHER;
1449 /* Copy stats */
1450 memcpy(&(threshold.qual), wstats, sizeof(struct iw_quality));
1451 /* Copy also thresholds */
1452 memcpy(&(threshold.low), &(spydata->spy_thr_low),
1453 2 * sizeof(struct iw_quality));
1454
1455 /* Send event to user space */
1456 wireless_send_event(dev, SIOCGIWTHRSPY, &wrqu, (char *) &threshold);
1457 }
1458
1459 /* ---------------------------------------------------------------- */
1460 /*
1461 * Call for the driver to update the spy data.
1462 * For now, the spy data is a simple array. As the size of the array is
1463 * small, this is good enough. If we wanted to support larger number of
1464 * spy addresses, we should use something more efficient...
1465 */
1466 void wireless_spy_update(struct net_device * dev,
1467 unsigned char * address,
1468 struct iw_quality * wstats)
1469 {
1470 struct iw_spy_data * spydata = get_spydata(dev);
1471 int i;
1472 int match = -1;
1473
1474 /* Make sure driver is not buggy or using the old API */
1475 if (!spydata)
1476 return;
1477
1478 /* Update all records that match */
1479 for (i = 0; i < spydata->spy_number; i++)
1480 if (!compare_ether_addr(address, spydata->spy_address[i])) {
1481 memcpy(&(spydata->spy_stat[i]), wstats,
1482 sizeof(struct iw_quality));
1483 match = i;
1484 }
1485
1486 /* Generate an event if we cross the spy threshold.
1487 * To avoid event storms, we have a simple hysteresis : we generate
1488 * event only when we go under the low threshold or above the
1489 * high threshold. */
1490 if (match >= 0) {
1491 if (spydata->spy_thr_under[match]) {
1492 if (wstats->level > spydata->spy_thr_high.level) {
1493 spydata->spy_thr_under[match] = 0;
1494 iw_send_thrspy_event(dev, spydata,
1495 address, wstats);
1496 }
1497 } else {
1498 if (wstats->level < spydata->spy_thr_low.level) {
1499 spydata->spy_thr_under[match] = 1;
1500 iw_send_thrspy_event(dev, spydata,
1501 address, wstats);
1502 }
1503 }
1504 }
1505 }
1506 EXPORT_SYMBOL(wireless_spy_update);
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