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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[mirror_ubuntu-bionic-kernel.git] / net / wireless / wext.c
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 inline 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 inline int adjust_priv_size(__u16 args,
516 union iwreq_data * wrqu)
517 {
518 int num = wrqu->data.length;
519 int max = args & IW_PRIV_SIZE_MASK;
520 int type = (args & IW_PRIV_TYPE_MASK) >> 12;
521
522 /* Make sure the driver doesn't goof up */
523 if (max < num)
524 num = max;
525
526 return num * iw_priv_type_size[type];
527 }
528
529 /* ---------------------------------------------------------------- */
530 /*
531 * Standard Wireless Handler : get wireless stats
532 * Allow programatic access to /proc/net/wireless even if /proc
533 * doesn't exist... Also more efficient...
534 */
535 static int iw_handler_get_iwstats(struct net_device * dev,
536 struct iw_request_info * info,
537 union iwreq_data * wrqu,
538 char * extra)
539 {
540 /* Get stats from the driver */
541 struct iw_statistics *stats;
542
543 stats = get_wireless_stats(dev);
544 if (stats) {
545 /* Copy statistics to extra */
546 memcpy(extra, stats, sizeof(struct iw_statistics));
547 wrqu->data.length = sizeof(struct iw_statistics);
548
549 /* Check if we need to clear the updated flag */
550 if (wrqu->data.flags != 0)
551 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
552 return 0;
553 } else
554 return -EOPNOTSUPP;
555 }
556
557 /* ---------------------------------------------------------------- */
558 /*
559 * Standard Wireless Handler : get iwpriv definitions
560 * Export the driver private handler definition
561 * They will be picked up by tools like iwpriv...
562 */
563 static int iw_handler_get_private(struct net_device * dev,
564 struct iw_request_info * info,
565 union iwreq_data * wrqu,
566 char * extra)
567 {
568 /* Check if the driver has something to export */
569 if ((dev->wireless_handlers->num_private_args == 0) ||
570 (dev->wireless_handlers->private_args == NULL))
571 return -EOPNOTSUPP;
572
573 /* Check if there is enough buffer up there */
574 if (wrqu->data.length < dev->wireless_handlers->num_private_args) {
575 /* User space can't know in advance how large the buffer
576 * needs to be. Give it a hint, so that we can support
577 * any size buffer we want somewhat efficiently... */
578 wrqu->data.length = dev->wireless_handlers->num_private_args;
579 return -E2BIG;
580 }
581
582 /* Set the number of available ioctls. */
583 wrqu->data.length = dev->wireless_handlers->num_private_args;
584
585 /* Copy structure to the user buffer. */
586 memcpy(extra, dev->wireless_handlers->private_args,
587 sizeof(struct iw_priv_args) * wrqu->data.length);
588
589 return 0;
590 }
591
592
593 /******************** /proc/net/wireless SUPPORT ********************/
594 /*
595 * The /proc/net/wireless file is a human readable user-space interface
596 * exporting various wireless specific statistics from the wireless devices.
597 * This is the most popular part of the Wireless Extensions ;-)
598 *
599 * This interface is a pure clone of /proc/net/dev (in net/core/dev.c).
600 * The content of the file is basically the content of "struct iw_statistics".
601 */
602
603 #ifdef CONFIG_PROC_FS
604
605 /* ---------------------------------------------------------------- */
606 /*
607 * Print one entry (line) of /proc/net/wireless
608 */
609 static void wireless_seq_printf_stats(struct seq_file *seq,
610 struct net_device *dev)
611 {
612 /* Get stats from the driver */
613 struct iw_statistics *stats = get_wireless_stats(dev);
614
615 if (stats) {
616 seq_printf(seq, "%6s: %04x %3d%c %3d%c %3d%c %6d %6d %6d "
617 "%6d %6d %6d\n",
618 dev->name, stats->status, stats->qual.qual,
619 stats->qual.updated & IW_QUAL_QUAL_UPDATED
620 ? '.' : ' ',
621 ((__s32) stats->qual.level) -
622 ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
623 stats->qual.updated & IW_QUAL_LEVEL_UPDATED
624 ? '.' : ' ',
625 ((__s32) stats->qual.noise) -
626 ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
627 stats->qual.updated & IW_QUAL_NOISE_UPDATED
628 ? '.' : ' ',
629 stats->discard.nwid, stats->discard.code,
630 stats->discard.fragment, stats->discard.retries,
631 stats->discard.misc, stats->miss.beacon);
632 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
633 }
634 }
635
636 /* ---------------------------------------------------------------- */
637 /*
638 * Print info for /proc/net/wireless (print all entries)
639 */
640 static int wireless_seq_show(struct seq_file *seq, void *v)
641 {
642 if (v == SEQ_START_TOKEN)
643 seq_printf(seq, "Inter-| sta-| Quality | Discarded "
644 "packets | Missed | WE\n"
645 " face | tus | link level noise | nwid "
646 "crypt frag retry misc | beacon | %d\n",
647 WIRELESS_EXT);
648 else
649 wireless_seq_printf_stats(seq, v);
650 return 0;
651 }
652
653 static const struct seq_operations wireless_seq_ops = {
654 .start = dev_seq_start,
655 .next = dev_seq_next,
656 .stop = dev_seq_stop,
657 .show = wireless_seq_show,
658 };
659
660 static int wireless_seq_open(struct inode *inode, struct file *file)
661 {
662 return seq_open_net(inode, file, &wireless_seq_ops,
663 sizeof(struct seq_net_private));
664 }
665
666 static const struct file_operations wireless_seq_fops = {
667 .owner = THIS_MODULE,
668 .open = wireless_seq_open,
669 .read = seq_read,
670 .llseek = seq_lseek,
671 .release = seq_release_net,
672 };
673
674 int wext_proc_init(struct net *net)
675 {
676 /* Create /proc/net/wireless entry */
677 if (!proc_net_fops_create(net, "wireless", S_IRUGO, &wireless_seq_fops))
678 return -ENOMEM;
679
680 return 0;
681 }
682
683 void wext_proc_exit(struct net *net)
684 {
685 proc_net_remove(net, "wireless");
686 }
687 #endif /* CONFIG_PROC_FS */
688
689 /************************** IOCTL SUPPORT **************************/
690 /*
691 * The original user space API to configure all those Wireless Extensions
692 * is through IOCTLs.
693 * In there, we check if we need to call the new driver API (iw_handler)
694 * or just call the driver ioctl handler.
695 */
696
697 /* ---------------------------------------------------------------- */
698 /*
699 * Wrapper to call a standard Wireless Extension handler.
700 * We do various checks and also take care of moving data between
701 * user space and kernel space.
702 */
703 static int ioctl_standard_call(struct net_device * dev,
704 struct ifreq * ifr,
705 unsigned int cmd,
706 iw_handler handler)
707 {
708 struct iwreq * iwr = (struct iwreq *) ifr;
709 const struct iw_ioctl_description * descr;
710 struct iw_request_info info;
711 int ret = -EINVAL;
712
713 /* Get the description of the IOCTL */
714 if ((cmd - SIOCIWFIRST) >= standard_ioctl_num)
715 return -EOPNOTSUPP;
716 descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
717
718 /* Prepare the call */
719 info.cmd = cmd;
720 info.flags = 0;
721
722 /* Check if we have a pointer to user space data or not */
723 if (descr->header_type != IW_HEADER_TYPE_POINT) {
724
725 /* No extra arguments. Trivial to handle */
726 ret = handler(dev, &info, &(iwr->u), NULL);
727
728 /* Generate an event to notify listeners of the change */
729 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
730 ((ret == 0) || (ret == -EIWCOMMIT)))
731 wireless_send_event(dev, cmd, &(iwr->u), NULL);
732 } else {
733 char * extra;
734 int extra_size;
735 int user_length = 0;
736 int err;
737 int essid_compat = 0;
738
739 /* Calculate space needed by arguments. Always allocate
740 * for max space. Easier, and won't last long... */
741 extra_size = descr->max_tokens * descr->token_size;
742
743 /* Check need for ESSID compatibility for WE < 21 */
744 switch (cmd) {
745 case SIOCSIWESSID:
746 case SIOCGIWESSID:
747 case SIOCSIWNICKN:
748 case SIOCGIWNICKN:
749 if (iwr->u.data.length == descr->max_tokens + 1)
750 essid_compat = 1;
751 else if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
752 char essid[IW_ESSID_MAX_SIZE + 1];
753
754 err = copy_from_user(essid, iwr->u.data.pointer,
755 iwr->u.data.length *
756 descr->token_size);
757 if (err)
758 return -EFAULT;
759
760 if (essid[iwr->u.data.length - 1] == '\0')
761 essid_compat = 1;
762 }
763 break;
764 default:
765 break;
766 }
767
768 iwr->u.data.length -= essid_compat;
769
770 /* Check what user space is giving us */
771 if (IW_IS_SET(cmd)) {
772 /* Check NULL pointer */
773 if ((iwr->u.data.pointer == NULL) &&
774 (iwr->u.data.length != 0))
775 return -EFAULT;
776 /* Check if number of token fits within bounds */
777 if (iwr->u.data.length > descr->max_tokens)
778 return -E2BIG;
779 if (iwr->u.data.length < descr->min_tokens)
780 return -EINVAL;
781 } else {
782 /* Check NULL pointer */
783 if (iwr->u.data.pointer == NULL)
784 return -EFAULT;
785 /* Save user space buffer size for checking */
786 user_length = iwr->u.data.length;
787
788 /* Don't check if user_length > max to allow forward
789 * compatibility. The test user_length < min is
790 * implied by the test at the end. */
791
792 /* Support for very large requests */
793 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
794 (user_length > descr->max_tokens)) {
795 /* Allow userspace to GET more than max so
796 * we can support any size GET requests.
797 * There is still a limit : -ENOMEM. */
798 extra_size = user_length * descr->token_size;
799 /* Note : user_length is originally a __u16,
800 * and token_size is controlled by us,
801 * so extra_size won't get negative and
802 * won't overflow... */
803 }
804 }
805
806 /* Create the kernel buffer */
807 /* kzalloc ensures NULL-termination for essid_compat */
808 extra = kzalloc(extra_size, GFP_KERNEL);
809 if (extra == NULL)
810 return -ENOMEM;
811
812 /* If it is a SET, get all the extra data in here */
813 if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
814 err = copy_from_user(extra, iwr->u.data.pointer,
815 iwr->u.data.length *
816 descr->token_size);
817 if (err) {
818 kfree(extra);
819 return -EFAULT;
820 }
821 }
822
823 /* Call the handler */
824 ret = handler(dev, &info, &(iwr->u), extra);
825
826 iwr->u.data.length += essid_compat;
827
828 /* If we have something to return to the user */
829 if (!ret && IW_IS_GET(cmd)) {
830 /* Check if there is enough buffer up there */
831 if (user_length < iwr->u.data.length) {
832 kfree(extra);
833 return -E2BIG;
834 }
835
836 err = copy_to_user(iwr->u.data.pointer, extra,
837 iwr->u.data.length *
838 descr->token_size);
839 if (err)
840 ret = -EFAULT;
841 }
842
843 /* Generate an event to notify listeners of the change */
844 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
845 ((ret == 0) || (ret == -EIWCOMMIT))) {
846 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
847 /* If the event is restricted, don't
848 * export the payload */
849 wireless_send_event(dev, cmd, &(iwr->u), NULL);
850 else
851 wireless_send_event(dev, cmd, &(iwr->u),
852 extra);
853 }
854
855 /* Cleanup - I told you it wasn't that long ;-) */
856 kfree(extra);
857 }
858
859 /* Call commit handler if needed and defined */
860 if (ret == -EIWCOMMIT)
861 ret = call_commit_handler(dev);
862
863 /* Here, we will generate the appropriate event if needed */
864
865 return ret;
866 }
867
868 /* ---------------------------------------------------------------- */
869 /*
870 * Wrapper to call a private Wireless Extension handler.
871 * We do various checks and also take care of moving data between
872 * user space and kernel space.
873 * It's not as nice and slimline as the standard wrapper. The cause
874 * is struct iw_priv_args, which was not really designed for the
875 * job we are going here.
876 *
877 * IMPORTANT : This function prevent to set and get data on the same
878 * IOCTL and enforce the SET/GET convention. Not doing it would be
879 * far too hairy...
880 * If you need to set and get data at the same time, please don't use
881 * a iw_handler but process it in your ioctl handler (i.e. use the
882 * old driver API).
883 */
884 static int ioctl_private_call(struct net_device *dev, struct ifreq *ifr,
885 unsigned int cmd, iw_handler handler)
886 {
887 struct iwreq * iwr = (struct iwreq *) ifr;
888 const struct iw_priv_args * descr = NULL;
889 struct iw_request_info info;
890 int extra_size = 0;
891 int i;
892 int ret = -EINVAL;
893
894 /* Get the description of the IOCTL */
895 for (i = 0; i < dev->wireless_handlers->num_private_args; i++)
896 if (cmd == dev->wireless_handlers->private_args[i].cmd) {
897 descr = &(dev->wireless_handlers->private_args[i]);
898 break;
899 }
900
901 /* Compute the size of the set/get arguments */
902 if (descr != NULL) {
903 if (IW_IS_SET(cmd)) {
904 int offset = 0; /* For sub-ioctls */
905 /* Check for sub-ioctl handler */
906 if (descr->name[0] == '\0')
907 /* Reserve one int for sub-ioctl index */
908 offset = sizeof(__u32);
909
910 /* Size of set arguments */
911 extra_size = get_priv_size(descr->set_args);
912
913 /* Does it fits in iwr ? */
914 if ((descr->set_args & IW_PRIV_SIZE_FIXED) &&
915 ((extra_size + offset) <= IFNAMSIZ))
916 extra_size = 0;
917 } else {
918 /* Size of get arguments */
919 extra_size = get_priv_size(descr->get_args);
920
921 /* Does it fits in iwr ? */
922 if ((descr->get_args & IW_PRIV_SIZE_FIXED) &&
923 (extra_size <= IFNAMSIZ))
924 extra_size = 0;
925 }
926 }
927
928 /* Prepare the call */
929 info.cmd = cmd;
930 info.flags = 0;
931
932 /* Check if we have a pointer to user space data or not. */
933 if (extra_size == 0) {
934 /* No extra arguments. Trivial to handle */
935 ret = handler(dev, &info, &(iwr->u), (char *) &(iwr->u));
936 } else {
937 char * extra;
938 int err;
939
940 /* Check what user space is giving us */
941 if (IW_IS_SET(cmd)) {
942 /* Check NULL pointer */
943 if ((iwr->u.data.pointer == NULL) &&
944 (iwr->u.data.length != 0))
945 return -EFAULT;
946
947 /* Does it fits within bounds ? */
948 if (iwr->u.data.length > (descr->set_args &
949 IW_PRIV_SIZE_MASK))
950 return -E2BIG;
951 } else if (iwr->u.data.pointer == NULL)
952 return -EFAULT;
953
954 /* Always allocate for max space. Easier, and won't last
955 * long... */
956 extra = kmalloc(extra_size, GFP_KERNEL);
957 if (extra == NULL)
958 return -ENOMEM;
959
960 /* If it is a SET, get all the extra data in here */
961 if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
962 err = copy_from_user(extra, iwr->u.data.pointer,
963 extra_size);
964 if (err) {
965 kfree(extra);
966 return -EFAULT;
967 }
968 }
969
970 /* Call the handler */
971 ret = handler(dev, &info, &(iwr->u), extra);
972
973 /* If we have something to return to the user */
974 if (!ret && IW_IS_GET(cmd)) {
975
976 /* Adjust for the actual length if it's variable,
977 * avoid leaking kernel bits outside. */
978 if (!(descr->get_args & IW_PRIV_SIZE_FIXED)) {
979 extra_size = adjust_priv_size(descr->get_args,
980 &(iwr->u));
981 }
982
983 err = copy_to_user(iwr->u.data.pointer, extra,
984 extra_size);
985 if (err)
986 ret = -EFAULT;
987 }
988
989 /* Cleanup - I told you it wasn't that long ;-) */
990 kfree(extra);
991 }
992
993
994 /* Call commit handler if needed and defined */
995 if (ret == -EIWCOMMIT)
996 ret = call_commit_handler(dev);
997
998 return ret;
999 }
1000
1001 /* ---------------------------------------------------------------- */
1002 /*
1003 * Main IOCTl dispatcher.
1004 * Check the type of IOCTL and call the appropriate wrapper...
1005 */
1006 static int wireless_process_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd)
1007 {
1008 struct net_device *dev;
1009 iw_handler handler;
1010
1011 /* Permissions are already checked in dev_ioctl() before calling us.
1012 * The copy_to/from_user() of ifr is also dealt with in there */
1013
1014 /* Make sure the device exist */
1015 if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL)
1016 return -ENODEV;
1017
1018 /* A bunch of special cases, then the generic case...
1019 * Note that 'cmd' is already filtered in dev_ioctl() with
1020 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
1021 if (cmd == SIOCGIWSTATS)
1022 return ioctl_standard_call(dev, ifr, cmd,
1023 &iw_handler_get_iwstats);
1024
1025 if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
1026 return ioctl_standard_call(dev, ifr, cmd,
1027 &iw_handler_get_private);
1028
1029 /* Basic check */
1030 if (!netif_device_present(dev))
1031 return -ENODEV;
1032
1033 /* New driver API : try to find the handler */
1034 handler = get_handler(dev, cmd);
1035 if (handler) {
1036 /* Standard and private are not the same */
1037 if (cmd < SIOCIWFIRSTPRIV)
1038 return ioctl_standard_call(dev, ifr, cmd, handler);
1039 else
1040 return ioctl_private_call(dev, ifr, cmd, handler);
1041 }
1042 /* Old driver API : call driver ioctl handler */
1043 if (dev->do_ioctl)
1044 return dev->do_ioctl(dev, ifr, cmd);
1045 return -EOPNOTSUPP;
1046 }
1047
1048 /* entry point from dev ioctl */
1049 int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
1050 void __user *arg)
1051 {
1052 int ret;
1053
1054 /* If command is `set a parameter', or
1055 * `get the encoding parameters', check if
1056 * the user has the right to do it */
1057 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE || cmd == SIOCGIWENCODEEXT)
1058 && !capable(CAP_NET_ADMIN))
1059 return -EPERM;
1060
1061 dev_load(net, ifr->ifr_name);
1062 rtnl_lock();
1063 ret = wireless_process_ioctl(net, ifr, cmd);
1064 rtnl_unlock();
1065 if (IW_IS_GET(cmd) && copy_to_user(arg, ifr, sizeof(struct iwreq)))
1066 return -EFAULT;
1067 return ret;
1068 }
1069
1070 /************************* EVENT PROCESSING *************************/
1071 /*
1072 * Process events generated by the wireless layer or the driver.
1073 * Most often, the event will be propagated through rtnetlink
1074 */
1075
1076 /* ---------------------------------------------------------------- */
1077 /*
1078 * Locking...
1079 * ----------
1080 *
1081 * Thanks to Herbert Xu <herbert@gondor.apana.org.au> for fixing
1082 * the locking issue in here and implementing this code !
1083 *
1084 * The issue : wireless_send_event() is often called in interrupt context,
1085 * while the Netlink layer can never be called in interrupt context.
1086 * The fully formed RtNetlink events are queued, and then a tasklet is run
1087 * to feed those to Netlink.
1088 * The skb_queue is interrupt safe, and its lock is not held while calling
1089 * Netlink, so there is no possibility of dealock.
1090 * Jean II
1091 */
1092
1093 static struct sk_buff_head wireless_nlevent_queue;
1094
1095 static int __init wireless_nlevent_init(void)
1096 {
1097 skb_queue_head_init(&wireless_nlevent_queue);
1098 return 0;
1099 }
1100
1101 subsys_initcall(wireless_nlevent_init);
1102
1103 static void wireless_nlevent_process(unsigned long data)
1104 {
1105 struct sk_buff *skb;
1106
1107 while ((skb = skb_dequeue(&wireless_nlevent_queue)))
1108 rtnl_notify(skb, &init_net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
1109 }
1110
1111 static DECLARE_TASKLET(wireless_nlevent_tasklet, wireless_nlevent_process, 0);
1112
1113 /* ---------------------------------------------------------------- */
1114 /*
1115 * Fill a rtnetlink message with our event data.
1116 * Note that we propage only the specified event and don't dump the
1117 * current wireless config. Dumping the wireless config is far too
1118 * expensive (for each parameter, the driver need to query the hardware).
1119 */
1120 static int rtnetlink_fill_iwinfo(struct sk_buff *skb, struct net_device *dev,
1121 int type, char *event, int event_len)
1122 {
1123 struct ifinfomsg *r;
1124 struct nlmsghdr *nlh;
1125
1126 nlh = nlmsg_put(skb, 0, 0, type, sizeof(*r), 0);
1127 if (nlh == NULL)
1128 return -EMSGSIZE;
1129
1130 r = nlmsg_data(nlh);
1131 r->ifi_family = AF_UNSPEC;
1132 r->__ifi_pad = 0;
1133 r->ifi_type = dev->type;
1134 r->ifi_index = dev->ifindex;
1135 r->ifi_flags = dev_get_flags(dev);
1136 r->ifi_change = 0; /* Wireless changes don't affect those flags */
1137
1138 /* Add the wireless events in the netlink packet */
1139 NLA_PUT(skb, IFLA_WIRELESS, event_len, event);
1140
1141 return nlmsg_end(skb, nlh);
1142
1143 nla_put_failure:
1144 nlmsg_cancel(skb, nlh);
1145 return -EMSGSIZE;
1146 }
1147
1148 /* ---------------------------------------------------------------- */
1149 /*
1150 * Create and broadcast and send it on the standard rtnetlink socket
1151 * This is a pure clone rtmsg_ifinfo() in net/core/rtnetlink.c
1152 * Andrzej Krzysztofowicz mandated that I used a IFLA_XXX field
1153 * within a RTM_NEWLINK event.
1154 */
1155 static void rtmsg_iwinfo(struct net_device *dev, char *event, int event_len)
1156 {
1157 struct sk_buff *skb;
1158 int err;
1159
1160 if (dev_net(dev) != &init_net)
1161 return;
1162
1163 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1164 if (!skb)
1165 return;
1166
1167 err = rtnetlink_fill_iwinfo(skb, dev, RTM_NEWLINK, event, event_len);
1168 if (err < 0) {
1169 WARN_ON(err == -EMSGSIZE);
1170 kfree_skb(skb);
1171 return;
1172 }
1173
1174 NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
1175 skb_queue_tail(&wireless_nlevent_queue, skb);
1176 tasklet_schedule(&wireless_nlevent_tasklet);
1177 }
1178
1179 /* ---------------------------------------------------------------- */
1180 /*
1181 * Main event dispatcher. Called from other parts and drivers.
1182 * Send the event on the appropriate channels.
1183 * May be called from interrupt context.
1184 */
1185 void wireless_send_event(struct net_device * dev,
1186 unsigned int cmd,
1187 union iwreq_data * wrqu,
1188 char * extra)
1189 {
1190 const struct iw_ioctl_description * descr = NULL;
1191 int extra_len = 0;
1192 struct iw_event *event; /* Mallocated whole event */
1193 int event_len; /* Its size */
1194 int hdr_len; /* Size of the event header */
1195 int wrqu_off = 0; /* Offset in wrqu */
1196 /* Don't "optimise" the following variable, it will crash */
1197 unsigned cmd_index; /* *MUST* be unsigned */
1198
1199 /* Get the description of the Event */
1200 if (cmd <= SIOCIWLAST) {
1201 cmd_index = cmd - SIOCIWFIRST;
1202 if (cmd_index < standard_ioctl_num)
1203 descr = &(standard_ioctl[cmd_index]);
1204 } else {
1205 cmd_index = cmd - IWEVFIRST;
1206 if (cmd_index < standard_event_num)
1207 descr = &(standard_event[cmd_index]);
1208 }
1209 /* Don't accept unknown events */
1210 if (descr == NULL) {
1211 /* Note : we don't return an error to the driver, because
1212 * the driver would not know what to do about it. It can't
1213 * return an error to the user, because the event is not
1214 * initiated by a user request.
1215 * The best the driver could do is to log an error message.
1216 * We will do it ourselves instead...
1217 */
1218 printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
1219 dev->name, cmd);
1220 return;
1221 }
1222
1223 /* Check extra parameters and set extra_len */
1224 if (descr->header_type == IW_HEADER_TYPE_POINT) {
1225 /* Check if number of token fits within bounds */
1226 if (wrqu->data.length > descr->max_tokens) {
1227 printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length);
1228 return;
1229 }
1230 if (wrqu->data.length < descr->min_tokens) {
1231 printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, wrqu->data.length);
1232 return;
1233 }
1234 /* Calculate extra_len - extra is NULL for restricted events */
1235 if (extra != NULL)
1236 extra_len = wrqu->data.length * descr->token_size;
1237 /* Always at an offset in wrqu */
1238 wrqu_off = IW_EV_POINT_OFF;
1239 }
1240
1241 /* Total length of the event */
1242 hdr_len = event_type_size[descr->header_type];
1243 event_len = hdr_len + extra_len;
1244
1245 /* Create temporary buffer to hold the event */
1246 event = kmalloc(event_len, GFP_ATOMIC);
1247 if (event == NULL)
1248 return;
1249
1250 /* Fill event */
1251 event->len = event_len;
1252 event->cmd = cmd;
1253 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
1254 if (extra)
1255 memcpy(((char *) event) + hdr_len, extra, extra_len);
1256
1257 /* Send via the RtNetlink event channel */
1258 rtmsg_iwinfo(dev, (char *) event, event_len);
1259
1260 /* Cleanup */
1261 kfree(event);
1262
1263 return; /* Always success, I guess ;-) */
1264 }
1265 EXPORT_SYMBOL(wireless_send_event);
1266
1267 /********************** ENHANCED IWSPY SUPPORT **********************/
1268 /*
1269 * In the old days, the driver was handling spy support all by itself.
1270 * Now, the driver can delegate this task to Wireless Extensions.
1271 * It needs to use those standard spy iw_handler in struct iw_handler_def,
1272 * push data to us via wireless_spy_update() and include struct iw_spy_data
1273 * in its private part (and export it in net_device->wireless_data->spy_data).
1274 * One of the main advantage of centralising spy support here is that
1275 * it becomes much easier to improve and extend it without having to touch
1276 * the drivers. One example is the addition of the Spy-Threshold events.
1277 */
1278
1279 /* ---------------------------------------------------------------- */
1280 /*
1281 * Return the pointer to the spy data in the driver.
1282 * Because this is called on the Rx path via wireless_spy_update(),
1283 * we want it to be efficient...
1284 */
1285 static inline struct iw_spy_data *get_spydata(struct net_device *dev)
1286 {
1287 /* This is the new way */
1288 if (dev->wireless_data)
1289 return dev->wireless_data->spy_data;
1290 return NULL;
1291 }
1292
1293 /*------------------------------------------------------------------*/
1294 /*
1295 * Standard Wireless Handler : set Spy List
1296 */
1297 int iw_handler_set_spy(struct net_device * dev,
1298 struct iw_request_info * info,
1299 union iwreq_data * wrqu,
1300 char * extra)
1301 {
1302 struct iw_spy_data * spydata = get_spydata(dev);
1303 struct sockaddr * address = (struct sockaddr *) extra;
1304
1305 /* Make sure driver is not buggy or using the old API */
1306 if (!spydata)
1307 return -EOPNOTSUPP;
1308
1309 /* Disable spy collection while we copy the addresses.
1310 * While we copy addresses, any call to wireless_spy_update()
1311 * will NOP. This is OK, as anyway the addresses are changing. */
1312 spydata->spy_number = 0;
1313
1314 /* We want to operate without locking, because wireless_spy_update()
1315 * most likely will happen in the interrupt handler, and therefore
1316 * have its own locking constraints and needs performance.
1317 * The rtnl_lock() make sure we don't race with the other iw_handlers.
1318 * This make sure wireless_spy_update() "see" that the spy list
1319 * is temporarily disabled. */
1320 smp_wmb();
1321
1322 /* Are there are addresses to copy? */
1323 if (wrqu->data.length > 0) {
1324 int i;
1325
1326 /* Copy addresses */
1327 for (i = 0; i < wrqu->data.length; i++)
1328 memcpy(spydata->spy_address[i], address[i].sa_data,
1329 ETH_ALEN);
1330 /* Reset stats */
1331 memset(spydata->spy_stat, 0,
1332 sizeof(struct iw_quality) * IW_MAX_SPY);
1333 }
1334
1335 /* Make sure above is updated before re-enabling */
1336 smp_wmb();
1337
1338 /* Enable addresses */
1339 spydata->spy_number = wrqu->data.length;
1340
1341 return 0;
1342 }
1343 EXPORT_SYMBOL(iw_handler_set_spy);
1344
1345 /*------------------------------------------------------------------*/
1346 /*
1347 * Standard Wireless Handler : get Spy List
1348 */
1349 int iw_handler_get_spy(struct net_device * dev,
1350 struct iw_request_info * info,
1351 union iwreq_data * wrqu,
1352 char * extra)
1353 {
1354 struct iw_spy_data * spydata = get_spydata(dev);
1355 struct sockaddr * address = (struct sockaddr *) extra;
1356 int i;
1357
1358 /* Make sure driver is not buggy or using the old API */
1359 if (!spydata)
1360 return -EOPNOTSUPP;
1361
1362 wrqu->data.length = spydata->spy_number;
1363
1364 /* Copy addresses. */
1365 for (i = 0; i < spydata->spy_number; i++) {
1366 memcpy(address[i].sa_data, spydata->spy_address[i], ETH_ALEN);
1367 address[i].sa_family = AF_UNIX;
1368 }
1369 /* Copy stats to the user buffer (just after). */
1370 if (spydata->spy_number > 0)
1371 memcpy(extra + (sizeof(struct sockaddr) *spydata->spy_number),
1372 spydata->spy_stat,
1373 sizeof(struct iw_quality) * spydata->spy_number);
1374 /* Reset updated flags. */
1375 for (i = 0; i < spydata->spy_number; i++)
1376 spydata->spy_stat[i].updated &= ~IW_QUAL_ALL_UPDATED;
1377 return 0;
1378 }
1379 EXPORT_SYMBOL(iw_handler_get_spy);
1380
1381 /*------------------------------------------------------------------*/
1382 /*
1383 * Standard Wireless Handler : set spy threshold
1384 */
1385 int iw_handler_set_thrspy(struct net_device * dev,
1386 struct iw_request_info *info,
1387 union iwreq_data * wrqu,
1388 char * extra)
1389 {
1390 struct iw_spy_data * spydata = get_spydata(dev);
1391 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
1392
1393 /* Make sure driver is not buggy or using the old API */
1394 if (!spydata)
1395 return -EOPNOTSUPP;
1396
1397 /* Just do it */
1398 memcpy(&(spydata->spy_thr_low), &(threshold->low),
1399 2 * sizeof(struct iw_quality));
1400
1401 /* Clear flag */
1402 memset(spydata->spy_thr_under, '\0', sizeof(spydata->spy_thr_under));
1403
1404 return 0;
1405 }
1406 EXPORT_SYMBOL(iw_handler_set_thrspy);
1407
1408 /*------------------------------------------------------------------*/
1409 /*
1410 * Standard Wireless Handler : get spy threshold
1411 */
1412 int iw_handler_get_thrspy(struct net_device * dev,
1413 struct iw_request_info *info,
1414 union iwreq_data * wrqu,
1415 char * extra)
1416 {
1417 struct iw_spy_data * spydata = get_spydata(dev);
1418 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
1419
1420 /* Make sure driver is not buggy or using the old API */
1421 if (!spydata)
1422 return -EOPNOTSUPP;
1423
1424 /* Just do it */
1425 memcpy(&(threshold->low), &(spydata->spy_thr_low),
1426 2 * sizeof(struct iw_quality));
1427
1428 return 0;
1429 }
1430 EXPORT_SYMBOL(iw_handler_get_thrspy);
1431
1432 /*------------------------------------------------------------------*/
1433 /*
1434 * Prepare and send a Spy Threshold event
1435 */
1436 static void iw_send_thrspy_event(struct net_device * dev,
1437 struct iw_spy_data * spydata,
1438 unsigned char * address,
1439 struct iw_quality * wstats)
1440 {
1441 union iwreq_data wrqu;
1442 struct iw_thrspy threshold;
1443
1444 /* Init */
1445 wrqu.data.length = 1;
1446 wrqu.data.flags = 0;
1447 /* Copy address */
1448 memcpy(threshold.addr.sa_data, address, ETH_ALEN);
1449 threshold.addr.sa_family = ARPHRD_ETHER;
1450 /* Copy stats */
1451 memcpy(&(threshold.qual), wstats, sizeof(struct iw_quality));
1452 /* Copy also thresholds */
1453 memcpy(&(threshold.low), &(spydata->spy_thr_low),
1454 2 * sizeof(struct iw_quality));
1455
1456 /* Send event to user space */
1457 wireless_send_event(dev, SIOCGIWTHRSPY, &wrqu, (char *) &threshold);
1458 }
1459
1460 /* ---------------------------------------------------------------- */
1461 /*
1462 * Call for the driver to update the spy data.
1463 * For now, the spy data is a simple array. As the size of the array is
1464 * small, this is good enough. If we wanted to support larger number of
1465 * spy addresses, we should use something more efficient...
1466 */
1467 void wireless_spy_update(struct net_device * dev,
1468 unsigned char * address,
1469 struct iw_quality * wstats)
1470 {
1471 struct iw_spy_data * spydata = get_spydata(dev);
1472 int i;
1473 int match = -1;
1474
1475 /* Make sure driver is not buggy or using the old API */
1476 if (!spydata)
1477 return;
1478
1479 /* Update all records that match */
1480 for (i = 0; i < spydata->spy_number; i++)
1481 if (!compare_ether_addr(address, spydata->spy_address[i])) {
1482 memcpy(&(spydata->spy_stat[i]), wstats,
1483 sizeof(struct iw_quality));
1484 match = i;
1485 }
1486
1487 /* Generate an event if we cross the spy threshold.
1488 * To avoid event storms, we have a simple hysteresis : we generate
1489 * event only when we go under the low threshold or above the
1490 * high threshold. */
1491 if (match >= 0) {
1492 if (spydata->spy_thr_under[match]) {
1493 if (wstats->level > spydata->spy_thr_high.level) {
1494 spydata->spy_thr_under[match] = 0;
1495 iw_send_thrspy_event(dev, spydata,
1496 address, wstats);
1497 }
1498 } else {
1499 if (wstats->level < spydata->spy_thr_low.level) {
1500 spydata->spy_thr_under[match] = 1;
1501 iw_send_thrspy_event(dev, spydata,
1502 address, wstats);
1503 }
1504 }
1505 }
1506 }
1507 EXPORT_SYMBOL(wireless_spy_update);
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