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[mirror_ubuntu-zesty-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 /* Size (in bytes) of various events, as packed */
421 static const int event_type_pk_size[] = {
422 IW_EV_LCP_PK_LEN, /* IW_HEADER_TYPE_NULL */
423 0,
424 IW_EV_CHAR_PK_LEN, /* IW_HEADER_TYPE_CHAR */
425 0,
426 IW_EV_UINT_PK_LEN, /* IW_HEADER_TYPE_UINT */
427 IW_EV_FREQ_PK_LEN, /* IW_HEADER_TYPE_FREQ */
428 IW_EV_ADDR_PK_LEN, /* IW_HEADER_TYPE_ADDR */
429 0,
430 IW_EV_POINT_PK_LEN, /* Without variable payload */
431 IW_EV_PARAM_PK_LEN, /* IW_HEADER_TYPE_PARAM */
432 IW_EV_QUAL_PK_LEN, /* IW_HEADER_TYPE_QUAL */
433 };
434
435 /************************ COMMON SUBROUTINES ************************/
436 /*
437 * Stuff that may be used in various place or doesn't fit in one
438 * of the section below.
439 */
440
441 /* ---------------------------------------------------------------- */
442 /*
443 * Return the driver handler associated with a specific Wireless Extension.
444 */
445 static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
446 {
447 /* Don't "optimise" the following variable, it will crash */
448 unsigned int index; /* *MUST* be unsigned */
449
450 /* Check if we have some wireless handlers defined */
451 if (dev->wireless_handlers == NULL)
452 return NULL;
453
454 /* Try as a standard command */
455 index = cmd - SIOCIWFIRST;
456 if (index < dev->wireless_handlers->num_standard)
457 return dev->wireless_handlers->standard[index];
458
459 /* Try as a private command */
460 index = cmd - SIOCIWFIRSTPRIV;
461 if (index < dev->wireless_handlers->num_private)
462 return dev->wireless_handlers->private[index];
463
464 /* Not found */
465 return NULL;
466 }
467
468 /* ---------------------------------------------------------------- */
469 /*
470 * Get statistics out of the driver
471 */
472 static struct iw_statistics *get_wireless_stats(struct net_device *dev)
473 {
474 /* New location */
475 if ((dev->wireless_handlers != NULL) &&
476 (dev->wireless_handlers->get_wireless_stats != NULL))
477 return dev->wireless_handlers->get_wireless_stats(dev);
478
479 /* Not found */
480 return NULL;
481 }
482
483 /* ---------------------------------------------------------------- */
484 /*
485 * Call the commit handler in the driver
486 * (if exist and if conditions are right)
487 *
488 * Note : our current commit strategy is currently pretty dumb,
489 * but we will be able to improve on that...
490 * The goal is to try to agreagate as many changes as possible
491 * before doing the commit. Drivers that will define a commit handler
492 * are usually those that need a reset after changing parameters, so
493 * we want to minimise the number of reset.
494 * A cool idea is to use a timer : at each "set" command, we re-set the
495 * timer, when the timer eventually fires, we call the driver.
496 * Hopefully, more on that later.
497 *
498 * Also, I'm waiting to see how many people will complain about the
499 * netif_running(dev) test. I'm open on that one...
500 * Hopefully, the driver will remember to do a commit in "open()" ;-)
501 */
502 static int call_commit_handler(struct net_device *dev)
503 {
504 if ((netif_running(dev)) &&
505 (dev->wireless_handlers->standard[0] != NULL))
506 /* Call the commit handler on the driver */
507 return dev->wireless_handlers->standard[0](dev, NULL,
508 NULL, NULL);
509 else
510 return 0; /* Command completed successfully */
511 }
512
513 /* ---------------------------------------------------------------- */
514 /*
515 * Calculate size of private arguments
516 */
517 static inline int get_priv_size(__u16 args)
518 {
519 int num = args & IW_PRIV_SIZE_MASK;
520 int type = (args & IW_PRIV_TYPE_MASK) >> 12;
521
522 return num * iw_priv_type_size[type];
523 }
524
525 /* ---------------------------------------------------------------- */
526 /*
527 * Re-calculate the size of private arguments
528 */
529 static inline int adjust_priv_size(__u16 args,
530 union iwreq_data * wrqu)
531 {
532 int num = wrqu->data.length;
533 int max = args & IW_PRIV_SIZE_MASK;
534 int type = (args & IW_PRIV_TYPE_MASK) >> 12;
535
536 /* Make sure the driver doesn't goof up */
537 if (max < num)
538 num = max;
539
540 return num * iw_priv_type_size[type];
541 }
542
543 /* ---------------------------------------------------------------- */
544 /*
545 * Standard Wireless Handler : get wireless stats
546 * Allow programatic access to /proc/net/wireless even if /proc
547 * doesn't exist... Also more efficient...
548 */
549 static int iw_handler_get_iwstats(struct net_device * dev,
550 struct iw_request_info * info,
551 union iwreq_data * wrqu,
552 char * extra)
553 {
554 /* Get stats from the driver */
555 struct iw_statistics *stats;
556
557 stats = get_wireless_stats(dev);
558 if (stats) {
559 /* Copy statistics to extra */
560 memcpy(extra, stats, sizeof(struct iw_statistics));
561 wrqu->data.length = sizeof(struct iw_statistics);
562
563 /* Check if we need to clear the updated flag */
564 if (wrqu->data.flags != 0)
565 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
566 return 0;
567 } else
568 return -EOPNOTSUPP;
569 }
570
571 /* ---------------------------------------------------------------- */
572 /*
573 * Standard Wireless Handler : get iwpriv definitions
574 * Export the driver private handler definition
575 * They will be picked up by tools like iwpriv...
576 */
577 static int iw_handler_get_private(struct net_device * dev,
578 struct iw_request_info * info,
579 union iwreq_data * wrqu,
580 char * extra)
581 {
582 /* Check if the driver has something to export */
583 if ((dev->wireless_handlers->num_private_args == 0) ||
584 (dev->wireless_handlers->private_args == NULL))
585 return -EOPNOTSUPP;
586
587 /* Check if there is enough buffer up there */
588 if (wrqu->data.length < dev->wireless_handlers->num_private_args) {
589 /* User space can't know in advance how large the buffer
590 * needs to be. Give it a hint, so that we can support
591 * any size buffer we want somewhat efficiently... */
592 wrqu->data.length = dev->wireless_handlers->num_private_args;
593 return -E2BIG;
594 }
595
596 /* Set the number of available ioctls. */
597 wrqu->data.length = dev->wireless_handlers->num_private_args;
598
599 /* Copy structure to the user buffer. */
600 memcpy(extra, dev->wireless_handlers->private_args,
601 sizeof(struct iw_priv_args) * wrqu->data.length);
602
603 return 0;
604 }
605
606
607 /******************** /proc/net/wireless SUPPORT ********************/
608 /*
609 * The /proc/net/wireless file is a human readable user-space interface
610 * exporting various wireless specific statistics from the wireless devices.
611 * This is the most popular part of the Wireless Extensions ;-)
612 *
613 * This interface is a pure clone of /proc/net/dev (in net/core/dev.c).
614 * The content of the file is basically the content of "struct iw_statistics".
615 */
616
617 #ifdef CONFIG_PROC_FS
618
619 /* ---------------------------------------------------------------- */
620 /*
621 * Print one entry (line) of /proc/net/wireless
622 */
623 static void wireless_seq_printf_stats(struct seq_file *seq,
624 struct net_device *dev)
625 {
626 /* Get stats from the driver */
627 struct iw_statistics *stats = get_wireless_stats(dev);
628
629 if (stats) {
630 seq_printf(seq, "%6s: %04x %3d%c %3d%c %3d%c %6d %6d %6d "
631 "%6d %6d %6d\n",
632 dev->name, stats->status, stats->qual.qual,
633 stats->qual.updated & IW_QUAL_QUAL_UPDATED
634 ? '.' : ' ',
635 ((__s32) stats->qual.level) -
636 ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
637 stats->qual.updated & IW_QUAL_LEVEL_UPDATED
638 ? '.' : ' ',
639 ((__s32) stats->qual.noise) -
640 ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
641 stats->qual.updated & IW_QUAL_NOISE_UPDATED
642 ? '.' : ' ',
643 stats->discard.nwid, stats->discard.code,
644 stats->discard.fragment, stats->discard.retries,
645 stats->discard.misc, stats->miss.beacon);
646 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
647 }
648 }
649
650 /* ---------------------------------------------------------------- */
651 /*
652 * Print info for /proc/net/wireless (print all entries)
653 */
654 static int wireless_seq_show(struct seq_file *seq, void *v)
655 {
656 if (v == SEQ_START_TOKEN)
657 seq_printf(seq, "Inter-| sta-| Quality | Discarded "
658 "packets | Missed | WE\n"
659 " face | tus | link level noise | nwid "
660 "crypt frag retry misc | beacon | %d\n",
661 WIRELESS_EXT);
662 else
663 wireless_seq_printf_stats(seq, v);
664 return 0;
665 }
666
667 static const struct seq_operations wireless_seq_ops = {
668 .start = dev_seq_start,
669 .next = dev_seq_next,
670 .stop = dev_seq_stop,
671 .show = wireless_seq_show,
672 };
673
674 static int wireless_seq_open(struct inode *inode, struct file *file)
675 {
676 struct seq_file *seq;
677 int res;
678 res = seq_open(file, &wireless_seq_ops);
679 if (!res) {
680 seq = file->private_data;
681 seq->private = get_net(PROC_NET(inode));
682 }
683 return res;
684 }
685
686 static int wireless_seq_release(struct inode *inode, struct file *file)
687 {
688 struct seq_file *seq = file->private_data;
689 struct net *net = seq->private;
690 put_net(net);
691 return seq_release(inode, file);
692 }
693
694 static const struct file_operations wireless_seq_fops = {
695 .owner = THIS_MODULE,
696 .open = wireless_seq_open,
697 .read = seq_read,
698 .llseek = seq_lseek,
699 .release = wireless_seq_release,
700 };
701
702 int wext_proc_init(struct net *net)
703 {
704 /* Create /proc/net/wireless entry */
705 if (!proc_net_fops_create(net, "wireless", S_IRUGO, &wireless_seq_fops))
706 return -ENOMEM;
707
708 return 0;
709 }
710
711 void wext_proc_exit(struct net *net)
712 {
713 proc_net_remove(net, "wireless");
714 }
715 #endif /* CONFIG_PROC_FS */
716
717 /************************** IOCTL SUPPORT **************************/
718 /*
719 * The original user space API to configure all those Wireless Extensions
720 * is through IOCTLs.
721 * In there, we check if we need to call the new driver API (iw_handler)
722 * or just call the driver ioctl handler.
723 */
724
725 /* ---------------------------------------------------------------- */
726 /*
727 * Wrapper to call a standard Wireless Extension handler.
728 * We do various checks and also take care of moving data between
729 * user space and kernel space.
730 */
731 static int ioctl_standard_call(struct net_device * dev,
732 struct ifreq * ifr,
733 unsigned int cmd,
734 iw_handler handler)
735 {
736 struct iwreq * iwr = (struct iwreq *) ifr;
737 const struct iw_ioctl_description * descr;
738 struct iw_request_info info;
739 int ret = -EINVAL;
740
741 /* Get the description of the IOCTL */
742 if ((cmd - SIOCIWFIRST) >= standard_ioctl_num)
743 return -EOPNOTSUPP;
744 descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
745
746 /* Prepare the call */
747 info.cmd = cmd;
748 info.flags = 0;
749
750 /* Check if we have a pointer to user space data or not */
751 if (descr->header_type != IW_HEADER_TYPE_POINT) {
752
753 /* No extra arguments. Trivial to handle */
754 ret = handler(dev, &info, &(iwr->u), NULL);
755
756 /* Generate an event to notify listeners of the change */
757 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
758 ((ret == 0) || (ret == -EIWCOMMIT)))
759 wireless_send_event(dev, cmd, &(iwr->u), NULL);
760 } else {
761 char * extra;
762 int extra_size;
763 int user_length = 0;
764 int err;
765 int essid_compat = 0;
766
767 /* Calculate space needed by arguments. Always allocate
768 * for max space. Easier, and won't last long... */
769 extra_size = descr->max_tokens * descr->token_size;
770
771 /* Check need for ESSID compatibility for WE < 21 */
772 switch (cmd) {
773 case SIOCSIWESSID:
774 case SIOCGIWESSID:
775 case SIOCSIWNICKN:
776 case SIOCGIWNICKN:
777 if (iwr->u.data.length == descr->max_tokens + 1)
778 essid_compat = 1;
779 else if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
780 char essid[IW_ESSID_MAX_SIZE + 1];
781
782 err = copy_from_user(essid, iwr->u.data.pointer,
783 iwr->u.data.length *
784 descr->token_size);
785 if (err)
786 return -EFAULT;
787
788 if (essid[iwr->u.data.length - 1] == '\0')
789 essid_compat = 1;
790 }
791 break;
792 default:
793 break;
794 }
795
796 iwr->u.data.length -= essid_compat;
797
798 /* Check what user space is giving us */
799 if (IW_IS_SET(cmd)) {
800 /* Check NULL pointer */
801 if ((iwr->u.data.pointer == NULL) &&
802 (iwr->u.data.length != 0))
803 return -EFAULT;
804 /* Check if number of token fits within bounds */
805 if (iwr->u.data.length > descr->max_tokens)
806 return -E2BIG;
807 if (iwr->u.data.length < descr->min_tokens)
808 return -EINVAL;
809 } else {
810 /* Check NULL pointer */
811 if (iwr->u.data.pointer == NULL)
812 return -EFAULT;
813 /* Save user space buffer size for checking */
814 user_length = iwr->u.data.length;
815
816 /* Don't check if user_length > max to allow forward
817 * compatibility. The test user_length < min is
818 * implied by the test at the end. */
819
820 /* Support for very large requests */
821 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
822 (user_length > descr->max_tokens)) {
823 /* Allow userspace to GET more than max so
824 * we can support any size GET requests.
825 * There is still a limit : -ENOMEM. */
826 extra_size = user_length * descr->token_size;
827 /* Note : user_length is originally a __u16,
828 * and token_size is controlled by us,
829 * so extra_size won't get negative and
830 * won't overflow... */
831 }
832 }
833
834 /* Create the kernel buffer */
835 /* kzalloc ensures NULL-termination for essid_compat */
836 extra = kzalloc(extra_size, GFP_KERNEL);
837 if (extra == NULL)
838 return -ENOMEM;
839
840 /* If it is a SET, get all the extra data in here */
841 if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
842 err = copy_from_user(extra, iwr->u.data.pointer,
843 iwr->u.data.length *
844 descr->token_size);
845 if (err) {
846 kfree(extra);
847 return -EFAULT;
848 }
849 }
850
851 /* Call the handler */
852 ret = handler(dev, &info, &(iwr->u), extra);
853
854 iwr->u.data.length += essid_compat;
855
856 /* If we have something to return to the user */
857 if (!ret && IW_IS_GET(cmd)) {
858 /* Check if there is enough buffer up there */
859 if (user_length < iwr->u.data.length) {
860 kfree(extra);
861 return -E2BIG;
862 }
863
864 err = copy_to_user(iwr->u.data.pointer, extra,
865 iwr->u.data.length *
866 descr->token_size);
867 if (err)
868 ret = -EFAULT;
869 }
870
871 /* Generate an event to notify listeners of the change */
872 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
873 ((ret == 0) || (ret == -EIWCOMMIT))) {
874 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
875 /* If the event is restricted, don't
876 * export the payload */
877 wireless_send_event(dev, cmd, &(iwr->u), NULL);
878 else
879 wireless_send_event(dev, cmd, &(iwr->u),
880 extra);
881 }
882
883 /* Cleanup - I told you it wasn't that long ;-) */
884 kfree(extra);
885 }
886
887 /* Call commit handler if needed and defined */
888 if (ret == -EIWCOMMIT)
889 ret = call_commit_handler(dev);
890
891 /* Here, we will generate the appropriate event if needed */
892
893 return ret;
894 }
895
896 /* ---------------------------------------------------------------- */
897 /*
898 * Wrapper to call a private Wireless Extension handler.
899 * We do various checks and also take care of moving data between
900 * user space and kernel space.
901 * It's not as nice and slimline as the standard wrapper. The cause
902 * is struct iw_priv_args, which was not really designed for the
903 * job we are going here.
904 *
905 * IMPORTANT : This function prevent to set and get data on the same
906 * IOCTL and enforce the SET/GET convention. Not doing it would be
907 * far too hairy...
908 * If you need to set and get data at the same time, please don't use
909 * a iw_handler but process it in your ioctl handler (i.e. use the
910 * old driver API).
911 */
912 static int ioctl_private_call(struct net_device *dev, struct ifreq *ifr,
913 unsigned int cmd, iw_handler handler)
914 {
915 struct iwreq * iwr = (struct iwreq *) ifr;
916 const struct iw_priv_args * descr = NULL;
917 struct iw_request_info info;
918 int extra_size = 0;
919 int i;
920 int ret = -EINVAL;
921
922 /* Get the description of the IOCTL */
923 for (i = 0; i < dev->wireless_handlers->num_private_args; i++)
924 if (cmd == dev->wireless_handlers->private_args[i].cmd) {
925 descr = &(dev->wireless_handlers->private_args[i]);
926 break;
927 }
928
929 /* Compute the size of the set/get arguments */
930 if (descr != NULL) {
931 if (IW_IS_SET(cmd)) {
932 int offset = 0; /* For sub-ioctls */
933 /* Check for sub-ioctl handler */
934 if (descr->name[0] == '\0')
935 /* Reserve one int for sub-ioctl index */
936 offset = sizeof(__u32);
937
938 /* Size of set arguments */
939 extra_size = get_priv_size(descr->set_args);
940
941 /* Does it fits in iwr ? */
942 if ((descr->set_args & IW_PRIV_SIZE_FIXED) &&
943 ((extra_size + offset) <= IFNAMSIZ))
944 extra_size = 0;
945 } else {
946 /* Size of get arguments */
947 extra_size = get_priv_size(descr->get_args);
948
949 /* Does it fits in iwr ? */
950 if ((descr->get_args & IW_PRIV_SIZE_FIXED) &&
951 (extra_size <= IFNAMSIZ))
952 extra_size = 0;
953 }
954 }
955
956 /* Prepare the call */
957 info.cmd = cmd;
958 info.flags = 0;
959
960 /* Check if we have a pointer to user space data or not. */
961 if (extra_size == 0) {
962 /* No extra arguments. Trivial to handle */
963 ret = handler(dev, &info, &(iwr->u), (char *) &(iwr->u));
964 } else {
965 char * extra;
966 int err;
967
968 /* Check what user space is giving us */
969 if (IW_IS_SET(cmd)) {
970 /* Check NULL pointer */
971 if ((iwr->u.data.pointer == NULL) &&
972 (iwr->u.data.length != 0))
973 return -EFAULT;
974
975 /* Does it fits within bounds ? */
976 if (iwr->u.data.length > (descr->set_args &
977 IW_PRIV_SIZE_MASK))
978 return -E2BIG;
979 } else if (iwr->u.data.pointer == NULL)
980 return -EFAULT;
981
982 /* Always allocate for max space. Easier, and won't last
983 * long... */
984 extra = kmalloc(extra_size, GFP_KERNEL);
985 if (extra == NULL)
986 return -ENOMEM;
987
988 /* If it is a SET, get all the extra data in here */
989 if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
990 err = copy_from_user(extra, iwr->u.data.pointer,
991 extra_size);
992 if (err) {
993 kfree(extra);
994 return -EFAULT;
995 }
996 }
997
998 /* Call the handler */
999 ret = handler(dev, &info, &(iwr->u), extra);
1000
1001 /* If we have something to return to the user */
1002 if (!ret && IW_IS_GET(cmd)) {
1003
1004 /* Adjust for the actual length if it's variable,
1005 * avoid leaking kernel bits outside. */
1006 if (!(descr->get_args & IW_PRIV_SIZE_FIXED)) {
1007 extra_size = adjust_priv_size(descr->get_args,
1008 &(iwr->u));
1009 }
1010
1011 err = copy_to_user(iwr->u.data.pointer, extra,
1012 extra_size);
1013 if (err)
1014 ret = -EFAULT;
1015 }
1016
1017 /* Cleanup - I told you it wasn't that long ;-) */
1018 kfree(extra);
1019 }
1020
1021
1022 /* Call commit handler if needed and defined */
1023 if (ret == -EIWCOMMIT)
1024 ret = call_commit_handler(dev);
1025
1026 return ret;
1027 }
1028
1029 /* ---------------------------------------------------------------- */
1030 /*
1031 * Main IOCTl dispatcher.
1032 * Check the type of IOCTL and call the appropriate wrapper...
1033 */
1034 static int wireless_process_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd)
1035 {
1036 struct net_device *dev;
1037 iw_handler handler;
1038
1039 /* Permissions are already checked in dev_ioctl() before calling us.
1040 * The copy_to/from_user() of ifr is also dealt with in there */
1041
1042 /* Make sure the device exist */
1043 if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL)
1044 return -ENODEV;
1045
1046 /* A bunch of special cases, then the generic case...
1047 * Note that 'cmd' is already filtered in dev_ioctl() with
1048 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
1049 if (cmd == SIOCGIWSTATS)
1050 return ioctl_standard_call(dev, ifr, cmd,
1051 &iw_handler_get_iwstats);
1052
1053 if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
1054 return ioctl_standard_call(dev, ifr, cmd,
1055 &iw_handler_get_private);
1056
1057 /* Basic check */
1058 if (!netif_device_present(dev))
1059 return -ENODEV;
1060
1061 /* New driver API : try to find the handler */
1062 handler = get_handler(dev, cmd);
1063 if (handler) {
1064 /* Standard and private are not the same */
1065 if (cmd < SIOCIWFIRSTPRIV)
1066 return ioctl_standard_call(dev, ifr, cmd, handler);
1067 else
1068 return ioctl_private_call(dev, ifr, cmd, handler);
1069 }
1070 /* Old driver API : call driver ioctl handler */
1071 if (dev->do_ioctl)
1072 return dev->do_ioctl(dev, ifr, cmd);
1073 return -EOPNOTSUPP;
1074 }
1075
1076 /* entry point from dev ioctl */
1077 int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
1078 void __user *arg)
1079 {
1080 int ret;
1081
1082 /* If command is `set a parameter', or
1083 * `get the encoding parameters', check if
1084 * the user has the right to do it */
1085 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE || cmd == SIOCGIWENCODEEXT)
1086 && !capable(CAP_NET_ADMIN))
1087 return -EPERM;
1088
1089 dev_load(net, ifr->ifr_name);
1090 rtnl_lock();
1091 ret = wireless_process_ioctl(net, ifr, cmd);
1092 rtnl_unlock();
1093 if (IW_IS_GET(cmd) && copy_to_user(arg, ifr, sizeof(struct ifreq)))
1094 return -EFAULT;
1095 return ret;
1096 }
1097
1098 /************************* EVENT PROCESSING *************************/
1099 /*
1100 * Process events generated by the wireless layer or the driver.
1101 * Most often, the event will be propagated through rtnetlink
1102 */
1103
1104 /* ---------------------------------------------------------------- */
1105 /*
1106 * Locking...
1107 * ----------
1108 *
1109 * Thanks to Herbert Xu <herbert@gondor.apana.org.au> for fixing
1110 * the locking issue in here and implementing this code !
1111 *
1112 * The issue : wireless_send_event() is often called in interrupt context,
1113 * while the Netlink layer can never be called in interrupt context.
1114 * The fully formed RtNetlink events are queued, and then a tasklet is run
1115 * to feed those to Netlink.
1116 * The skb_queue is interrupt safe, and its lock is not held while calling
1117 * Netlink, so there is no possibility of dealock.
1118 * Jean II
1119 */
1120
1121 static struct sk_buff_head wireless_nlevent_queue;
1122
1123 static int __init wireless_nlevent_init(void)
1124 {
1125 skb_queue_head_init(&wireless_nlevent_queue);
1126 return 0;
1127 }
1128
1129 subsys_initcall(wireless_nlevent_init);
1130
1131 static void wireless_nlevent_process(unsigned long data)
1132 {
1133 struct sk_buff *skb;
1134
1135 while ((skb = skb_dequeue(&wireless_nlevent_queue)))
1136 rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
1137 }
1138
1139 static DECLARE_TASKLET(wireless_nlevent_tasklet, wireless_nlevent_process, 0);
1140
1141 /* ---------------------------------------------------------------- */
1142 /*
1143 * Fill a rtnetlink message with our event data.
1144 * Note that we propage only the specified event and don't dump the
1145 * current wireless config. Dumping the wireless config is far too
1146 * expensive (for each parameter, the driver need to query the hardware).
1147 */
1148 static int rtnetlink_fill_iwinfo(struct sk_buff *skb, struct net_device *dev,
1149 int type, char *event, int event_len)
1150 {
1151 struct ifinfomsg *r;
1152 struct nlmsghdr *nlh;
1153
1154 nlh = nlmsg_put(skb, 0, 0, type, sizeof(*r), 0);
1155 if (nlh == NULL)
1156 return -EMSGSIZE;
1157
1158 r = nlmsg_data(nlh);
1159 r->ifi_family = AF_UNSPEC;
1160 r->__ifi_pad = 0;
1161 r->ifi_type = dev->type;
1162 r->ifi_index = dev->ifindex;
1163 r->ifi_flags = dev_get_flags(dev);
1164 r->ifi_change = 0; /* Wireless changes don't affect those flags */
1165
1166 /* Add the wireless events in the netlink packet */
1167 NLA_PUT(skb, IFLA_WIRELESS, event_len, event);
1168
1169 return nlmsg_end(skb, nlh);
1170
1171 nla_put_failure:
1172 nlmsg_cancel(skb, nlh);
1173 return -EMSGSIZE;
1174 }
1175
1176 /* ---------------------------------------------------------------- */
1177 /*
1178 * Create and broadcast and send it on the standard rtnetlink socket
1179 * This is a pure clone rtmsg_ifinfo() in net/core/rtnetlink.c
1180 * Andrzej Krzysztofowicz mandated that I used a IFLA_XXX field
1181 * within a RTM_NEWLINK event.
1182 */
1183 static void rtmsg_iwinfo(struct net_device *dev, char *event, int event_len)
1184 {
1185 struct sk_buff *skb;
1186 int err;
1187
1188 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1189 if (!skb)
1190 return;
1191
1192 err = rtnetlink_fill_iwinfo(skb, dev, RTM_NEWLINK, event, event_len);
1193 if (err < 0) {
1194 WARN_ON(err == -EMSGSIZE);
1195 kfree_skb(skb);
1196 return;
1197 }
1198
1199 NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
1200 skb_queue_tail(&wireless_nlevent_queue, skb);
1201 tasklet_schedule(&wireless_nlevent_tasklet);
1202 }
1203
1204 /* ---------------------------------------------------------------- */
1205 /*
1206 * Main event dispatcher. Called from other parts and drivers.
1207 * Send the event on the appropriate channels.
1208 * May be called from interrupt context.
1209 */
1210 void wireless_send_event(struct net_device * dev,
1211 unsigned int cmd,
1212 union iwreq_data * wrqu,
1213 char * extra)
1214 {
1215 const struct iw_ioctl_description * descr = NULL;
1216 int extra_len = 0;
1217 struct iw_event *event; /* Mallocated whole event */
1218 int event_len; /* Its size */
1219 int hdr_len; /* Size of the event header */
1220 int wrqu_off = 0; /* Offset in wrqu */
1221 /* Don't "optimise" the following variable, it will crash */
1222 unsigned cmd_index; /* *MUST* be unsigned */
1223
1224 /* Get the description of the Event */
1225 if (cmd <= SIOCIWLAST) {
1226 cmd_index = cmd - SIOCIWFIRST;
1227 if (cmd_index < standard_ioctl_num)
1228 descr = &(standard_ioctl[cmd_index]);
1229 } else {
1230 cmd_index = cmd - IWEVFIRST;
1231 if (cmd_index < standard_event_num)
1232 descr = &(standard_event[cmd_index]);
1233 }
1234 /* Don't accept unknown events */
1235 if (descr == NULL) {
1236 /* Note : we don't return an error to the driver, because
1237 * the driver would not know what to do about it. It can't
1238 * return an error to the user, because the event is not
1239 * initiated by a user request.
1240 * The best the driver could do is to log an error message.
1241 * We will do it ourselves instead...
1242 */
1243 printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
1244 dev->name, cmd);
1245 return;
1246 }
1247
1248 /* Check extra parameters and set extra_len */
1249 if (descr->header_type == IW_HEADER_TYPE_POINT) {
1250 /* Check if number of token fits within bounds */
1251 if (wrqu->data.length > descr->max_tokens) {
1252 printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length);
1253 return;
1254 }
1255 if (wrqu->data.length < descr->min_tokens) {
1256 printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, wrqu->data.length);
1257 return;
1258 }
1259 /* Calculate extra_len - extra is NULL for restricted events */
1260 if (extra != NULL)
1261 extra_len = wrqu->data.length * descr->token_size;
1262 /* Always at an offset in wrqu */
1263 wrqu_off = IW_EV_POINT_OFF;
1264 }
1265
1266 /* Total length of the event */
1267 hdr_len = event_type_size[descr->header_type];
1268 event_len = hdr_len + extra_len;
1269
1270 /* Create temporary buffer to hold the event */
1271 event = kmalloc(event_len, GFP_ATOMIC);
1272 if (event == NULL)
1273 return;
1274
1275 /* Fill event */
1276 event->len = event_len;
1277 event->cmd = cmd;
1278 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
1279 if (extra)
1280 memcpy(((char *) event) + hdr_len, extra, extra_len);
1281
1282 /* Send via the RtNetlink event channel */
1283 rtmsg_iwinfo(dev, (char *) event, event_len);
1284
1285 /* Cleanup */
1286 kfree(event);
1287
1288 return; /* Always success, I guess ;-) */
1289 }
1290 EXPORT_SYMBOL(wireless_send_event);
1291
1292 /********************** ENHANCED IWSPY SUPPORT **********************/
1293 /*
1294 * In the old days, the driver was handling spy support all by itself.
1295 * Now, the driver can delegate this task to Wireless Extensions.
1296 * It needs to use those standard spy iw_handler in struct iw_handler_def,
1297 * push data to us via wireless_spy_update() and include struct iw_spy_data
1298 * in its private part (and export it in net_device->wireless_data->spy_data).
1299 * One of the main advantage of centralising spy support here is that
1300 * it becomes much easier to improve and extend it without having to touch
1301 * the drivers. One example is the addition of the Spy-Threshold events.
1302 */
1303
1304 /* ---------------------------------------------------------------- */
1305 /*
1306 * Return the pointer to the spy data in the driver.
1307 * Because this is called on the Rx path via wireless_spy_update(),
1308 * we want it to be efficient...
1309 */
1310 static inline struct iw_spy_data *get_spydata(struct net_device *dev)
1311 {
1312 /* This is the new way */
1313 if (dev->wireless_data)
1314 return dev->wireless_data->spy_data;
1315 return NULL;
1316 }
1317
1318 /*------------------------------------------------------------------*/
1319 /*
1320 * Standard Wireless Handler : set Spy List
1321 */
1322 int iw_handler_set_spy(struct net_device * dev,
1323 struct iw_request_info * info,
1324 union iwreq_data * wrqu,
1325 char * extra)
1326 {
1327 struct iw_spy_data * spydata = get_spydata(dev);
1328 struct sockaddr * address = (struct sockaddr *) extra;
1329
1330 /* Make sure driver is not buggy or using the old API */
1331 if (!spydata)
1332 return -EOPNOTSUPP;
1333
1334 /* Disable spy collection while we copy the addresses.
1335 * While we copy addresses, any call to wireless_spy_update()
1336 * will NOP. This is OK, as anyway the addresses are changing. */
1337 spydata->spy_number = 0;
1338
1339 /* We want to operate without locking, because wireless_spy_update()
1340 * most likely will happen in the interrupt handler, and therefore
1341 * have its own locking constraints and needs performance.
1342 * The rtnl_lock() make sure we don't race with the other iw_handlers.
1343 * This make sure wireless_spy_update() "see" that the spy list
1344 * is temporarily disabled. */
1345 smp_wmb();
1346
1347 /* Are there are addresses to copy? */
1348 if (wrqu->data.length > 0) {
1349 int i;
1350
1351 /* Copy addresses */
1352 for (i = 0; i < wrqu->data.length; i++)
1353 memcpy(spydata->spy_address[i], address[i].sa_data,
1354 ETH_ALEN);
1355 /* Reset stats */
1356 memset(spydata->spy_stat, 0,
1357 sizeof(struct iw_quality) * IW_MAX_SPY);
1358 }
1359
1360 /* Make sure above is updated before re-enabling */
1361 smp_wmb();
1362
1363 /* Enable addresses */
1364 spydata->spy_number = wrqu->data.length;
1365
1366 return 0;
1367 }
1368 EXPORT_SYMBOL(iw_handler_set_spy);
1369
1370 /*------------------------------------------------------------------*/
1371 /*
1372 * Standard Wireless Handler : get Spy List
1373 */
1374 int iw_handler_get_spy(struct net_device * dev,
1375 struct iw_request_info * info,
1376 union iwreq_data * wrqu,
1377 char * extra)
1378 {
1379 struct iw_spy_data * spydata = get_spydata(dev);
1380 struct sockaddr * address = (struct sockaddr *) extra;
1381 int i;
1382
1383 /* Make sure driver is not buggy or using the old API */
1384 if (!spydata)
1385 return -EOPNOTSUPP;
1386
1387 wrqu->data.length = spydata->spy_number;
1388
1389 /* Copy addresses. */
1390 for (i = 0; i < spydata->spy_number; i++) {
1391 memcpy(address[i].sa_data, spydata->spy_address[i], ETH_ALEN);
1392 address[i].sa_family = AF_UNIX;
1393 }
1394 /* Copy stats to the user buffer (just after). */
1395 if (spydata->spy_number > 0)
1396 memcpy(extra + (sizeof(struct sockaddr) *spydata->spy_number),
1397 spydata->spy_stat,
1398 sizeof(struct iw_quality) * spydata->spy_number);
1399 /* Reset updated flags. */
1400 for (i = 0; i < spydata->spy_number; i++)
1401 spydata->spy_stat[i].updated &= ~IW_QUAL_ALL_UPDATED;
1402 return 0;
1403 }
1404 EXPORT_SYMBOL(iw_handler_get_spy);
1405
1406 /*------------------------------------------------------------------*/
1407 /*
1408 * Standard Wireless Handler : set spy threshold
1409 */
1410 int iw_handler_set_thrspy(struct net_device * dev,
1411 struct iw_request_info *info,
1412 union iwreq_data * wrqu,
1413 char * extra)
1414 {
1415 struct iw_spy_data * spydata = get_spydata(dev);
1416 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
1417
1418 /* Make sure driver is not buggy or using the old API */
1419 if (!spydata)
1420 return -EOPNOTSUPP;
1421
1422 /* Just do it */
1423 memcpy(&(spydata->spy_thr_low), &(threshold->low),
1424 2 * sizeof(struct iw_quality));
1425
1426 /* Clear flag */
1427 memset(spydata->spy_thr_under, '\0', sizeof(spydata->spy_thr_under));
1428
1429 return 0;
1430 }
1431 EXPORT_SYMBOL(iw_handler_set_thrspy);
1432
1433 /*------------------------------------------------------------------*/
1434 /*
1435 * Standard Wireless Handler : get spy threshold
1436 */
1437 int iw_handler_get_thrspy(struct net_device * dev,
1438 struct iw_request_info *info,
1439 union iwreq_data * wrqu,
1440 char * extra)
1441 {
1442 struct iw_spy_data * spydata = get_spydata(dev);
1443 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
1444
1445 /* Make sure driver is not buggy or using the old API */
1446 if (!spydata)
1447 return -EOPNOTSUPP;
1448
1449 /* Just do it */
1450 memcpy(&(threshold->low), &(spydata->spy_thr_low),
1451 2 * sizeof(struct iw_quality));
1452
1453 return 0;
1454 }
1455 EXPORT_SYMBOL(iw_handler_get_thrspy);
1456
1457 /*------------------------------------------------------------------*/
1458 /*
1459 * Prepare and send a Spy Threshold event
1460 */
1461 static void iw_send_thrspy_event(struct net_device * dev,
1462 struct iw_spy_data * spydata,
1463 unsigned char * address,
1464 struct iw_quality * wstats)
1465 {
1466 union iwreq_data wrqu;
1467 struct iw_thrspy threshold;
1468
1469 /* Init */
1470 wrqu.data.length = 1;
1471 wrqu.data.flags = 0;
1472 /* Copy address */
1473 memcpy(threshold.addr.sa_data, address, ETH_ALEN);
1474 threshold.addr.sa_family = ARPHRD_ETHER;
1475 /* Copy stats */
1476 memcpy(&(threshold.qual), wstats, sizeof(struct iw_quality));
1477 /* Copy also thresholds */
1478 memcpy(&(threshold.low), &(spydata->spy_thr_low),
1479 2 * sizeof(struct iw_quality));
1480
1481 /* Send event to user space */
1482 wireless_send_event(dev, SIOCGIWTHRSPY, &wrqu, (char *) &threshold);
1483 }
1484
1485 /* ---------------------------------------------------------------- */
1486 /*
1487 * Call for the driver to update the spy data.
1488 * For now, the spy data is a simple array. As the size of the array is
1489 * small, this is good enough. If we wanted to support larger number of
1490 * spy addresses, we should use something more efficient...
1491 */
1492 void wireless_spy_update(struct net_device * dev,
1493 unsigned char * address,
1494 struct iw_quality * wstats)
1495 {
1496 struct iw_spy_data * spydata = get_spydata(dev);
1497 int i;
1498 int match = -1;
1499
1500 /* Make sure driver is not buggy or using the old API */
1501 if (!spydata)
1502 return;
1503
1504 /* Update all records that match */
1505 for (i = 0; i < spydata->spy_number; i++)
1506 if (!compare_ether_addr(address, spydata->spy_address[i])) {
1507 memcpy(&(spydata->spy_stat[i]), wstats,
1508 sizeof(struct iw_quality));
1509 match = i;
1510 }
1511
1512 /* Generate an event if we cross the spy threshold.
1513 * To avoid event storms, we have a simple hysteresis : we generate
1514 * event only when we go under the low threshold or above the
1515 * high threshold. */
1516 if (match >= 0) {
1517 if (spydata->spy_thr_under[match]) {
1518 if (wstats->level > spydata->spy_thr_high.level) {
1519 spydata->spy_thr_under[match] = 0;
1520 iw_send_thrspy_event(dev, spydata,
1521 address, wstats);
1522 }
1523 } else {
1524 if (wstats->level < spydata->spy_thr_low.level) {
1525 spydata->spy_thr_under[match] = 1;
1526 iw_send_thrspy_event(dev, spydata,
1527 address, wstats);
1528 }
1529 }
1530 }
1531 }
1532 EXPORT_SYMBOL(wireless_spy_update);
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