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[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 int get_priv_size(__u16 args)
504 {
505 int num = args & IW_PRIV_SIZE_MASK;
506 int type = (args & IW_PRIV_TYPE_MASK) >> 12;
507
508 return num * iw_priv_type_size[type];
509 }
510
511 /* ---------------------------------------------------------------- */
512 /*
513 * Re-calculate the size of private arguments
514 */
515 static int adjust_priv_size(__u16 args, struct iw_point *iwp)
516 {
517 int num = iwp->length;
518 int max = args & IW_PRIV_SIZE_MASK;
519 int type = (args & IW_PRIV_TYPE_MASK) >> 12;
520
521 /* Make sure the driver doesn't goof up */
522 if (max < num)
523 num = max;
524
525 return num * iw_priv_type_size[type];
526 }
527
528 /* ---------------------------------------------------------------- */
529 /*
530 * Standard Wireless Handler : get wireless stats
531 * Allow programatic access to /proc/net/wireless even if /proc
532 * doesn't exist... Also more efficient...
533 */
534 static int iw_handler_get_iwstats(struct net_device * dev,
535 struct iw_request_info * info,
536 union iwreq_data * wrqu,
537 char * extra)
538 {
539 /* Get stats from the driver */
540 struct iw_statistics *stats;
541
542 stats = get_wireless_stats(dev);
543 if (stats) {
544 /* Copy statistics to extra */
545 memcpy(extra, stats, sizeof(struct iw_statistics));
546 wrqu->data.length = sizeof(struct iw_statistics);
547
548 /* Check if we need to clear the updated flag */
549 if (wrqu->data.flags != 0)
550 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
551 return 0;
552 } else
553 return -EOPNOTSUPP;
554 }
555
556 /* ---------------------------------------------------------------- */
557 /*
558 * Standard Wireless Handler : get iwpriv definitions
559 * Export the driver private handler definition
560 * They will be picked up by tools like iwpriv...
561 */
562 static int iw_handler_get_private(struct net_device * dev,
563 struct iw_request_info * info,
564 union iwreq_data * wrqu,
565 char * extra)
566 {
567 /* Check if the driver has something to export */
568 if ((dev->wireless_handlers->num_private_args == 0) ||
569 (dev->wireless_handlers->private_args == NULL))
570 return -EOPNOTSUPP;
571
572 /* Check if there is enough buffer up there */
573 if (wrqu->data.length < dev->wireless_handlers->num_private_args) {
574 /* User space can't know in advance how large the buffer
575 * needs to be. Give it a hint, so that we can support
576 * any size buffer we want somewhat efficiently... */
577 wrqu->data.length = dev->wireless_handlers->num_private_args;
578 return -E2BIG;
579 }
580
581 /* Set the number of available ioctls. */
582 wrqu->data.length = dev->wireless_handlers->num_private_args;
583
584 /* Copy structure to the user buffer. */
585 memcpy(extra, dev->wireless_handlers->private_args,
586 sizeof(struct iw_priv_args) * wrqu->data.length);
587
588 return 0;
589 }
590
591
592 /******************** /proc/net/wireless SUPPORT ********************/
593 /*
594 * The /proc/net/wireless file is a human readable user-space interface
595 * exporting various wireless specific statistics from the wireless devices.
596 * This is the most popular part of the Wireless Extensions ;-)
597 *
598 * This interface is a pure clone of /proc/net/dev (in net/core/dev.c).
599 * The content of the file is basically the content of "struct iw_statistics".
600 */
601
602 #ifdef CONFIG_PROC_FS
603
604 /* ---------------------------------------------------------------- */
605 /*
606 * Print one entry (line) of /proc/net/wireless
607 */
608 static void wireless_seq_printf_stats(struct seq_file *seq,
609 struct net_device *dev)
610 {
611 /* Get stats from the driver */
612 struct iw_statistics *stats = get_wireless_stats(dev);
613
614 if (stats) {
615 seq_printf(seq, "%6s: %04x %3d%c %3d%c %3d%c %6d %6d %6d "
616 "%6d %6d %6d\n",
617 dev->name, stats->status, stats->qual.qual,
618 stats->qual.updated & IW_QUAL_QUAL_UPDATED
619 ? '.' : ' ',
620 ((__s32) stats->qual.level) -
621 ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
622 stats->qual.updated & IW_QUAL_LEVEL_UPDATED
623 ? '.' : ' ',
624 ((__s32) stats->qual.noise) -
625 ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
626 stats->qual.updated & IW_QUAL_NOISE_UPDATED
627 ? '.' : ' ',
628 stats->discard.nwid, stats->discard.code,
629 stats->discard.fragment, stats->discard.retries,
630 stats->discard.misc, stats->miss.beacon);
631 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
632 }
633 }
634
635 /* ---------------------------------------------------------------- */
636 /*
637 * Print info for /proc/net/wireless (print all entries)
638 */
639 static int wireless_seq_show(struct seq_file *seq, void *v)
640 {
641 if (v == SEQ_START_TOKEN)
642 seq_printf(seq, "Inter-| sta-| Quality | Discarded "
643 "packets | Missed | WE\n"
644 " face | tus | link level noise | nwid "
645 "crypt frag retry misc | beacon | %d\n",
646 WIRELESS_EXT);
647 else
648 wireless_seq_printf_stats(seq, v);
649 return 0;
650 }
651
652 static const struct seq_operations wireless_seq_ops = {
653 .start = dev_seq_start,
654 .next = dev_seq_next,
655 .stop = dev_seq_stop,
656 .show = wireless_seq_show,
657 };
658
659 static int wireless_seq_open(struct inode *inode, struct file *file)
660 {
661 return seq_open_net(inode, file, &wireless_seq_ops,
662 sizeof(struct seq_net_private));
663 }
664
665 static const struct file_operations wireless_seq_fops = {
666 .owner = THIS_MODULE,
667 .open = wireless_seq_open,
668 .read = seq_read,
669 .llseek = seq_lseek,
670 .release = seq_release_net,
671 };
672
673 int wext_proc_init(struct net *net)
674 {
675 /* Create /proc/net/wireless entry */
676 if (!proc_net_fops_create(net, "wireless", S_IRUGO, &wireless_seq_fops))
677 return -ENOMEM;
678
679 return 0;
680 }
681
682 void wext_proc_exit(struct net *net)
683 {
684 proc_net_remove(net, "wireless");
685 }
686 #endif /* CONFIG_PROC_FS */
687
688 /************************** IOCTL SUPPORT **************************/
689 /*
690 * The original user space API to configure all those Wireless Extensions
691 * is through IOCTLs.
692 * In there, we check if we need to call the new driver API (iw_handler)
693 * or just call the driver ioctl handler.
694 */
695
696 /* ---------------------------------------------------------------- */
697 static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
698 const struct iw_ioctl_description *descr,
699 iw_handler handler, struct net_device *dev,
700 struct iw_request_info *info)
701 {
702 int err, extra_size, user_length = 0, essid_compat = 0;
703 char *extra;
704
705 /* Calculate space needed by arguments. Always allocate
706 * for max space.
707 */
708 extra_size = descr->max_tokens * descr->token_size;
709
710 /* Check need for ESSID compatibility for WE < 21 */
711 switch (cmd) {
712 case SIOCSIWESSID:
713 case SIOCGIWESSID:
714 case SIOCSIWNICKN:
715 case SIOCGIWNICKN:
716 if (iwp->length == descr->max_tokens + 1)
717 essid_compat = 1;
718 else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
719 char essid[IW_ESSID_MAX_SIZE + 1];
720
721 err = copy_from_user(essid, iwp->pointer,
722 iwp->length *
723 descr->token_size);
724 if (err)
725 return -EFAULT;
726
727 if (essid[iwp->length - 1] == '\0')
728 essid_compat = 1;
729 }
730 break;
731 default:
732 break;
733 }
734
735 iwp->length -= essid_compat;
736
737 /* Check what user space is giving us */
738 if (IW_IS_SET(cmd)) {
739 /* Check NULL pointer */
740 if (!iwp->pointer && iwp->length != 0)
741 return -EFAULT;
742 /* Check if number of token fits within bounds */
743 if (iwp->length > descr->max_tokens)
744 return -E2BIG;
745 if (iwp->length < descr->min_tokens)
746 return -EINVAL;
747 } else {
748 /* Check NULL pointer */
749 if (!iwp->pointer)
750 return -EFAULT;
751 /* Save user space buffer size for checking */
752 user_length = iwp->length;
753
754 /* Don't check if user_length > max to allow forward
755 * compatibility. The test user_length < min is
756 * implied by the test at the end.
757 */
758
759 /* Support for very large requests */
760 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
761 (user_length > descr->max_tokens)) {
762 /* Allow userspace to GET more than max so
763 * we can support any size GET requests.
764 * There is still a limit : -ENOMEM.
765 */
766 extra_size = user_length * descr->token_size;
767
768 /* Note : user_length is originally a __u16,
769 * and token_size is controlled by us,
770 * so extra_size won't get negative and
771 * won't overflow...
772 */
773 }
774 }
775
776 /* kzalloc() ensures NULL-termination for essid_compat. */
777 extra = kzalloc(extra_size, GFP_KERNEL);
778 if (!extra)
779 return -ENOMEM;
780
781 /* If it is a SET, get all the extra data in here */
782 if (IW_IS_SET(cmd) && (iwp->length != 0)) {
783 if (copy_from_user(extra, iwp->pointer,
784 iwp->length *
785 descr->token_size)) {
786 err = -EFAULT;
787 goto out;
788 }
789 }
790
791 err = handler(dev, info, (union iwreq_data *) iwp, extra);
792
793 iwp->length += essid_compat;
794
795 /* If we have something to return to the user */
796 if (!err && IW_IS_GET(cmd)) {
797 /* Check if there is enough buffer up there */
798 if (user_length < iwp->length) {
799 err = -E2BIG;
800 goto out;
801 }
802
803 if (copy_to_user(iwp->pointer, extra,
804 iwp->length *
805 descr->token_size)) {
806 err = -EFAULT;
807 goto out;
808 }
809 }
810
811 /* Generate an event to notify listeners of the change */
812 if ((descr->flags & IW_DESCR_FLAG_EVENT) && err == -EIWCOMMIT) {
813 union iwreq_data *data = (union iwreq_data *) iwp;
814
815 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
816 /* If the event is restricted, don't
817 * export the payload.
818 */
819 wireless_send_event(dev, cmd, data, NULL);
820 else
821 wireless_send_event(dev, cmd, data, extra);
822 }
823
824 out:
825 kfree(extra);
826 return err;
827 }
828
829 /*
830 * Wrapper to call a standard Wireless Extension handler.
831 * We do various checks and also take care of moving data between
832 * user space and kernel space.
833 */
834 static int ioctl_standard_call(struct net_device * dev,
835 struct iwreq *iwr,
836 unsigned int cmd,
837 struct iw_request_info *info,
838 iw_handler handler)
839 {
840 const struct iw_ioctl_description * descr;
841 int ret = -EINVAL;
842
843 /* Get the description of the IOCTL */
844 if ((cmd - SIOCIWFIRST) >= standard_ioctl_num)
845 return -EOPNOTSUPP;
846 descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
847
848 /* Check if we have a pointer to user space data or not */
849 if (descr->header_type != IW_HEADER_TYPE_POINT) {
850
851 /* No extra arguments. Trivial to handle */
852 ret = handler(dev, info, &(iwr->u), NULL);
853
854 /* Generate an event to notify listeners of the change */
855 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
856 ((ret == 0) || (ret == -EIWCOMMIT)))
857 wireless_send_event(dev, cmd, &(iwr->u), NULL);
858 } else {
859 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
860 handler, dev, info);
861 }
862
863 /* Call commit handler if needed and defined */
864 if (ret == -EIWCOMMIT)
865 ret = call_commit_handler(dev);
866
867 /* Here, we will generate the appropriate event if needed */
868
869 return ret;
870 }
871
872 /* ---------------------------------------------------------------- */
873 /*
874 * Wrapper to call a private Wireless Extension handler.
875 * We do various checks and also take care of moving data between
876 * user space and kernel space.
877 * It's not as nice and slimline as the standard wrapper. The cause
878 * is struct iw_priv_args, which was not really designed for the
879 * job we are going here.
880 *
881 * IMPORTANT : This function prevent to set and get data on the same
882 * IOCTL and enforce the SET/GET convention. Not doing it would be
883 * far too hairy...
884 * If you need to set and get data at the same time, please don't use
885 * a iw_handler but process it in your ioctl handler (i.e. use the
886 * old driver API).
887 */
888 static int get_priv_descr_and_size(struct net_device *dev, unsigned int cmd,
889 const struct iw_priv_args **descrp)
890 {
891 const struct iw_priv_args *descr;
892 int i, extra_size;
893
894 descr = NULL;
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
902 extra_size = 0;
903 if (descr) {
904 if (IW_IS_SET(cmd)) {
905 int offset = 0; /* For sub-ioctls */
906 /* Check for sub-ioctl handler */
907 if (descr->name[0] == '\0')
908 /* Reserve one int for sub-ioctl index */
909 offset = sizeof(__u32);
910
911 /* Size of set arguments */
912 extra_size = get_priv_size(descr->set_args);
913
914 /* Does it fits in iwr ? */
915 if ((descr->set_args & IW_PRIV_SIZE_FIXED) &&
916 ((extra_size + offset) <= IFNAMSIZ))
917 extra_size = 0;
918 } else {
919 /* Size of get arguments */
920 extra_size = get_priv_size(descr->get_args);
921
922 /* Does it fits in iwr ? */
923 if ((descr->get_args & IW_PRIV_SIZE_FIXED) &&
924 (extra_size <= IFNAMSIZ))
925 extra_size = 0;
926 }
927 }
928 *descrp = descr;
929 return extra_size;
930 }
931
932 static int ioctl_private_iw_point(struct iw_point *iwp, unsigned int cmd,
933 const struct iw_priv_args *descr,
934 iw_handler handler, struct net_device *dev,
935 struct iw_request_info *info, int extra_size)
936 {
937 char *extra;
938 int err;
939
940 /* Check what user space is giving us */
941 if (IW_IS_SET(cmd)) {
942 if (!iwp->pointer && iwp->length != 0)
943 return -EFAULT;
944
945 if (iwp->length > (descr->set_args & IW_PRIV_SIZE_MASK))
946 return -E2BIG;
947 } else if (!iwp->pointer)
948 return -EFAULT;
949
950 extra = kmalloc(extra_size, GFP_KERNEL);
951 if (!extra)
952 return -ENOMEM;
953
954 /* If it is a SET, get all the extra data in here */
955 if (IW_IS_SET(cmd) && (iwp->length != 0)) {
956 if (copy_from_user(extra, iwp->pointer, extra_size)) {
957 err = -EFAULT;
958 goto out;
959 }
960 }
961
962 /* Call the handler */
963 err = handler(dev, info, (union iwreq_data *) iwp, extra);
964
965 /* If we have something to return to the user */
966 if (!err && IW_IS_GET(cmd)) {
967 /* Adjust for the actual length if it's variable,
968 * avoid leaking kernel bits outside.
969 */
970 if (!(descr->get_args & IW_PRIV_SIZE_FIXED))
971 extra_size = adjust_priv_size(descr->get_args, iwp);
972
973 if (copy_to_user(iwp->pointer, extra, extra_size))
974 err = -EFAULT;
975 }
976
977 out:
978 kfree(extra);
979 return err;
980 }
981
982 static int ioctl_private_call(struct net_device *dev, struct iwreq *iwr,
983 unsigned int cmd, struct iw_request_info *info,
984 iw_handler handler)
985 {
986 int extra_size = 0, ret = -EINVAL;
987 const struct iw_priv_args *descr;
988
989 extra_size = get_priv_descr_and_size(dev, cmd, &descr);
990
991 /* Check if we have a pointer to user space data or not. */
992 if (extra_size == 0) {
993 /* No extra arguments. Trivial to handle */
994 ret = handler(dev, info, &(iwr->u), (char *) &(iwr->u));
995 } else {
996 ret = ioctl_private_iw_point(&iwr->u.data, cmd, descr,
997 handler, dev, info, extra_size);
998 }
999
1000 /* Call commit handler if needed and defined */
1001 if (ret == -EIWCOMMIT)
1002 ret = call_commit_handler(dev);
1003
1004 return ret;
1005 }
1006
1007 /* ---------------------------------------------------------------- */
1008 typedef int (*wext_ioctl_func)(struct net_device *, struct iwreq *,
1009 unsigned int, struct iw_request_info *,
1010 iw_handler);
1011
1012 /*
1013 * Main IOCTl dispatcher.
1014 * Check the type of IOCTL and call the appropriate wrapper...
1015 */
1016 static int wireless_process_ioctl(struct net *net, struct ifreq *ifr,
1017 unsigned int cmd,
1018 struct iw_request_info *info,
1019 wext_ioctl_func standard,
1020 wext_ioctl_func private)
1021 {
1022 struct iwreq *iwr = (struct iwreq *) ifr;
1023 struct net_device *dev;
1024 iw_handler handler;
1025
1026 /* Permissions are already checked in dev_ioctl() before calling us.
1027 * The copy_to/from_user() of ifr is also dealt with in there */
1028
1029 /* Make sure the device exist */
1030 if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL)
1031 return -ENODEV;
1032
1033 /* A bunch of special cases, then the generic case...
1034 * Note that 'cmd' is already filtered in dev_ioctl() with
1035 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
1036 if (cmd == SIOCGIWSTATS)
1037 return standard(dev, iwr, cmd, info,
1038 &iw_handler_get_iwstats);
1039
1040 if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
1041 return standard(dev, iwr, cmd, info,
1042 &iw_handler_get_private);
1043
1044 /* Basic check */
1045 if (!netif_device_present(dev))
1046 return -ENODEV;
1047
1048 /* New driver API : try to find the handler */
1049 handler = get_handler(dev, cmd);
1050 if (handler) {
1051 /* Standard and private are not the same */
1052 if (cmd < SIOCIWFIRSTPRIV)
1053 return standard(dev, iwr, cmd, info, handler);
1054 else
1055 return private(dev, iwr, cmd, info, handler);
1056 }
1057 /* Old driver API : call driver ioctl handler */
1058 if (dev->do_ioctl)
1059 return dev->do_ioctl(dev, ifr, cmd);
1060 return -EOPNOTSUPP;
1061 }
1062
1063 /* If command is `set a parameter', or `get the encoding parameters',
1064 * check if the user has the right to do it.
1065 */
1066 static int wext_permission_check(unsigned int cmd)
1067 {
1068 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE || cmd == SIOCGIWENCODEEXT)
1069 && !capable(CAP_NET_ADMIN))
1070 return -EPERM;
1071
1072 return 0;
1073 }
1074
1075 /* entry point from dev ioctl */
1076 static int wext_ioctl_dispatch(struct net *net, struct ifreq *ifr,
1077 unsigned int cmd, struct iw_request_info *info,
1078 wext_ioctl_func standard,
1079 wext_ioctl_func private)
1080 {
1081 int ret = wext_permission_check(cmd);
1082
1083 if (ret)
1084 return ret;
1085
1086 dev_load(net, ifr->ifr_name);
1087 rtnl_lock();
1088 ret = wireless_process_ioctl(net, ifr, cmd, info, standard, private);
1089 rtnl_unlock();
1090
1091 return ret;
1092 }
1093
1094 int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
1095 void __user *arg)
1096 {
1097 struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1098 int ret;
1099
1100 ret = wext_ioctl_dispatch(net, ifr, cmd, &info,
1101 ioctl_standard_call,
1102 ioctl_private_call);
1103 if (ret >= 0 &&
1104 IW_IS_GET(cmd) &&
1105 copy_to_user(arg, ifr, sizeof(struct iwreq)))
1106 return -EFAULT;
1107
1108 return ret;
1109 }
1110
1111 #ifdef CONFIG_COMPAT
1112 static int compat_standard_call(struct net_device *dev,
1113 struct iwreq *iwr,
1114 unsigned int cmd,
1115 struct iw_request_info *info,
1116 iw_handler handler)
1117 {
1118 const struct iw_ioctl_description *descr;
1119 struct compat_iw_point *iwp_compat;
1120 struct iw_point iwp;
1121 int err;
1122
1123 descr = standard_ioctl + (cmd - SIOCIWFIRST);
1124
1125 if (descr->header_type != IW_HEADER_TYPE_POINT)
1126 return ioctl_standard_call(dev, iwr, cmd, info, handler);
1127
1128 iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1129 iwp.pointer = compat_ptr(iwp_compat->pointer);
1130 iwp.length = iwp_compat->length;
1131 iwp.flags = iwp_compat->flags;
1132
1133 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1134
1135 iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1136 iwp_compat->length = iwp.length;
1137 iwp_compat->flags = iwp.flags;
1138
1139 return err;
1140 }
1141
1142 static int compat_private_call(struct net_device *dev, struct iwreq *iwr,
1143 unsigned int cmd, struct iw_request_info *info,
1144 iw_handler handler)
1145 {
1146 const struct iw_priv_args *descr;
1147 int ret, extra_size;
1148
1149 extra_size = get_priv_descr_and_size(dev, cmd, &descr);
1150
1151 /* Check if we have a pointer to user space data or not. */
1152 if (extra_size == 0) {
1153 /* No extra arguments. Trivial to handle */
1154 ret = handler(dev, info, &(iwr->u), (char *) &(iwr->u));
1155 } else {
1156 struct compat_iw_point *iwp_compat;
1157 struct iw_point iwp;
1158
1159 iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1160 iwp.pointer = compat_ptr(iwp_compat->pointer);
1161 iwp.length = iwp_compat->length;
1162 iwp.flags = iwp_compat->flags;
1163
1164 ret = ioctl_private_iw_point(&iwp, cmd, descr,
1165 handler, dev, info, extra_size);
1166
1167 iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1168 iwp_compat->length = iwp.length;
1169 iwp_compat->flags = iwp.flags;
1170 }
1171
1172 /* Call commit handler if needed and defined */
1173 if (ret == -EIWCOMMIT)
1174 ret = call_commit_handler(dev);
1175
1176 return ret;
1177 }
1178
1179 int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1180 unsigned long arg)
1181 {
1182 void __user *argp = (void __user *)arg;
1183 struct iw_request_info info;
1184 struct iwreq iwr;
1185 char *colon;
1186 int ret;
1187
1188 if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1189 return -EFAULT;
1190
1191 iwr.ifr_name[IFNAMSIZ-1] = 0;
1192 colon = strchr(iwr.ifr_name, ':');
1193 if (colon)
1194 *colon = 0;
1195
1196 info.cmd = cmd;
1197 info.flags = IW_REQUEST_FLAG_COMPAT;
1198
1199 ret = wext_ioctl_dispatch(net, (struct ifreq *) &iwr, cmd, &info,
1200 compat_standard_call,
1201 compat_private_call);
1202
1203 if (ret >= 0 &&
1204 IW_IS_GET(cmd) &&
1205 copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1206 return -EFAULT;
1207
1208 return ret;
1209 }
1210 #endif
1211
1212 /************************* EVENT PROCESSING *************************/
1213 /*
1214 * Process events generated by the wireless layer or the driver.
1215 * Most often, the event will be propagated through rtnetlink
1216 */
1217
1218 /* ---------------------------------------------------------------- */
1219 /*
1220 * Locking...
1221 * ----------
1222 *
1223 * Thanks to Herbert Xu <herbert@gondor.apana.org.au> for fixing
1224 * the locking issue in here and implementing this code !
1225 *
1226 * The issue : wireless_send_event() is often called in interrupt context,
1227 * while the Netlink layer can never be called in interrupt context.
1228 * The fully formed RtNetlink events are queued, and then a tasklet is run
1229 * to feed those to Netlink.
1230 * The skb_queue is interrupt safe, and its lock is not held while calling
1231 * Netlink, so there is no possibility of dealock.
1232 * Jean II
1233 */
1234
1235 static struct sk_buff_head wireless_nlevent_queue;
1236
1237 static int __init wireless_nlevent_init(void)
1238 {
1239 skb_queue_head_init(&wireless_nlevent_queue);
1240 return 0;
1241 }
1242
1243 subsys_initcall(wireless_nlevent_init);
1244
1245 static void wireless_nlevent_process(unsigned long data)
1246 {
1247 struct sk_buff *skb;
1248
1249 while ((skb = skb_dequeue(&wireless_nlevent_queue)))
1250 rtnl_notify(skb, &init_net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
1251 }
1252
1253 static DECLARE_TASKLET(wireless_nlevent_tasklet, wireless_nlevent_process, 0);
1254
1255 /* ---------------------------------------------------------------- */
1256 /*
1257 * Fill a rtnetlink message with our event data.
1258 * Note that we propage only the specified event and don't dump the
1259 * current wireless config. Dumping the wireless config is far too
1260 * expensive (for each parameter, the driver need to query the hardware).
1261 */
1262 static int rtnetlink_fill_iwinfo(struct sk_buff *skb, struct net_device *dev,
1263 int type, char *event, int event_len)
1264 {
1265 struct ifinfomsg *r;
1266 struct nlmsghdr *nlh;
1267
1268 nlh = nlmsg_put(skb, 0, 0, type, sizeof(*r), 0);
1269 if (nlh == NULL)
1270 return -EMSGSIZE;
1271
1272 r = nlmsg_data(nlh);
1273 r->ifi_family = AF_UNSPEC;
1274 r->__ifi_pad = 0;
1275 r->ifi_type = dev->type;
1276 r->ifi_index = dev->ifindex;
1277 r->ifi_flags = dev_get_flags(dev);
1278 r->ifi_change = 0; /* Wireless changes don't affect those flags */
1279
1280 /* Add the wireless events in the netlink packet */
1281 NLA_PUT(skb, IFLA_WIRELESS, event_len, event);
1282
1283 return nlmsg_end(skb, nlh);
1284
1285 nla_put_failure:
1286 nlmsg_cancel(skb, nlh);
1287 return -EMSGSIZE;
1288 }
1289
1290 /* ---------------------------------------------------------------- */
1291 /*
1292 * Create and broadcast and send it on the standard rtnetlink socket
1293 * This is a pure clone rtmsg_ifinfo() in net/core/rtnetlink.c
1294 * Andrzej Krzysztofowicz mandated that I used a IFLA_XXX field
1295 * within a RTM_NEWLINK event.
1296 */
1297 static void rtmsg_iwinfo(struct net_device *dev, char *event, int event_len)
1298 {
1299 struct sk_buff *skb;
1300 int err;
1301
1302 if (!net_eq(dev_net(dev), &init_net))
1303 return;
1304
1305 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1306 if (!skb)
1307 return;
1308
1309 err = rtnetlink_fill_iwinfo(skb, dev, RTM_NEWLINK, event, event_len);
1310 if (err < 0) {
1311 WARN_ON(err == -EMSGSIZE);
1312 kfree_skb(skb);
1313 return;
1314 }
1315
1316 NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
1317 skb_queue_tail(&wireless_nlevent_queue, skb);
1318 tasklet_schedule(&wireless_nlevent_tasklet);
1319 }
1320
1321 /* ---------------------------------------------------------------- */
1322 /*
1323 * Main event dispatcher. Called from other parts and drivers.
1324 * Send the event on the appropriate channels.
1325 * May be called from interrupt context.
1326 */
1327 void wireless_send_event(struct net_device * dev,
1328 unsigned int cmd,
1329 union iwreq_data * wrqu,
1330 char * extra)
1331 {
1332 const struct iw_ioctl_description * descr = NULL;
1333 int extra_len = 0;
1334 struct iw_event *event; /* Mallocated whole event */
1335 int event_len; /* Its size */
1336 int hdr_len; /* Size of the event header */
1337 int wrqu_off = 0; /* Offset in wrqu */
1338 /* Don't "optimise" the following variable, it will crash */
1339 unsigned cmd_index; /* *MUST* be unsigned */
1340
1341 /* Get the description of the Event */
1342 if (cmd <= SIOCIWLAST) {
1343 cmd_index = cmd - SIOCIWFIRST;
1344 if (cmd_index < standard_ioctl_num)
1345 descr = &(standard_ioctl[cmd_index]);
1346 } else {
1347 cmd_index = cmd - IWEVFIRST;
1348 if (cmd_index < standard_event_num)
1349 descr = &(standard_event[cmd_index]);
1350 }
1351 /* Don't accept unknown events */
1352 if (descr == NULL) {
1353 /* Note : we don't return an error to the driver, because
1354 * the driver would not know what to do about it. It can't
1355 * return an error to the user, because the event is not
1356 * initiated by a user request.
1357 * The best the driver could do is to log an error message.
1358 * We will do it ourselves instead...
1359 */
1360 printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
1361 dev->name, cmd);
1362 return;
1363 }
1364
1365 /* Check extra parameters and set extra_len */
1366 if (descr->header_type == IW_HEADER_TYPE_POINT) {
1367 /* Check if number of token fits within bounds */
1368 if (wrqu->data.length > descr->max_tokens) {
1369 printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length);
1370 return;
1371 }
1372 if (wrqu->data.length < descr->min_tokens) {
1373 printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, wrqu->data.length);
1374 return;
1375 }
1376 /* Calculate extra_len - extra is NULL for restricted events */
1377 if (extra != NULL)
1378 extra_len = wrqu->data.length * descr->token_size;
1379 /* Always at an offset in wrqu */
1380 wrqu_off = IW_EV_POINT_OFF;
1381 }
1382
1383 /* Total length of the event */
1384 hdr_len = event_type_size[descr->header_type];
1385 event_len = hdr_len + extra_len;
1386
1387 /* Create temporary buffer to hold the event */
1388 event = kmalloc(event_len, GFP_ATOMIC);
1389 if (event == NULL)
1390 return;
1391
1392 /* Fill event */
1393 event->len = event_len;
1394 event->cmd = cmd;
1395 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
1396 if (extra)
1397 memcpy(((char *) event) + hdr_len, extra, extra_len);
1398
1399 /* Send via the RtNetlink event channel */
1400 rtmsg_iwinfo(dev, (char *) event, event_len);
1401
1402 /* Cleanup */
1403 kfree(event);
1404
1405 return; /* Always success, I guess ;-) */
1406 }
1407 EXPORT_SYMBOL(wireless_send_event);
1408
1409 /********************** ENHANCED IWSPY SUPPORT **********************/
1410 /*
1411 * In the old days, the driver was handling spy support all by itself.
1412 * Now, the driver can delegate this task to Wireless Extensions.
1413 * It needs to use those standard spy iw_handler in struct iw_handler_def,
1414 * push data to us via wireless_spy_update() and include struct iw_spy_data
1415 * in its private part (and export it in net_device->wireless_data->spy_data).
1416 * One of the main advantage of centralising spy support here is that
1417 * it becomes much easier to improve and extend it without having to touch
1418 * the drivers. One example is the addition of the Spy-Threshold events.
1419 */
1420
1421 /* ---------------------------------------------------------------- */
1422 /*
1423 * Return the pointer to the spy data in the driver.
1424 * Because this is called on the Rx path via wireless_spy_update(),
1425 * we want it to be efficient...
1426 */
1427 static inline struct iw_spy_data *get_spydata(struct net_device *dev)
1428 {
1429 /* This is the new way */
1430 if (dev->wireless_data)
1431 return dev->wireless_data->spy_data;
1432 return NULL;
1433 }
1434
1435 /*------------------------------------------------------------------*/
1436 /*
1437 * Standard Wireless Handler : set Spy List
1438 */
1439 int iw_handler_set_spy(struct net_device * dev,
1440 struct iw_request_info * info,
1441 union iwreq_data * wrqu,
1442 char * extra)
1443 {
1444 struct iw_spy_data * spydata = get_spydata(dev);
1445 struct sockaddr * address = (struct sockaddr *) extra;
1446
1447 /* Make sure driver is not buggy or using the old API */
1448 if (!spydata)
1449 return -EOPNOTSUPP;
1450
1451 /* Disable spy collection while we copy the addresses.
1452 * While we copy addresses, any call to wireless_spy_update()
1453 * will NOP. This is OK, as anyway the addresses are changing. */
1454 spydata->spy_number = 0;
1455
1456 /* We want to operate without locking, because wireless_spy_update()
1457 * most likely will happen in the interrupt handler, and therefore
1458 * have its own locking constraints and needs performance.
1459 * The rtnl_lock() make sure we don't race with the other iw_handlers.
1460 * This make sure wireless_spy_update() "see" that the spy list
1461 * is temporarily disabled. */
1462 smp_wmb();
1463
1464 /* Are there are addresses to copy? */
1465 if (wrqu->data.length > 0) {
1466 int i;
1467
1468 /* Copy addresses */
1469 for (i = 0; i < wrqu->data.length; i++)
1470 memcpy(spydata->spy_address[i], address[i].sa_data,
1471 ETH_ALEN);
1472 /* Reset stats */
1473 memset(spydata->spy_stat, 0,
1474 sizeof(struct iw_quality) * IW_MAX_SPY);
1475 }
1476
1477 /* Make sure above is updated before re-enabling */
1478 smp_wmb();
1479
1480 /* Enable addresses */
1481 spydata->spy_number = wrqu->data.length;
1482
1483 return 0;
1484 }
1485 EXPORT_SYMBOL(iw_handler_set_spy);
1486
1487 /*------------------------------------------------------------------*/
1488 /*
1489 * Standard Wireless Handler : get Spy List
1490 */
1491 int iw_handler_get_spy(struct net_device * dev,
1492 struct iw_request_info * info,
1493 union iwreq_data * wrqu,
1494 char * extra)
1495 {
1496 struct iw_spy_data * spydata = get_spydata(dev);
1497 struct sockaddr * address = (struct sockaddr *) extra;
1498 int i;
1499
1500 /* Make sure driver is not buggy or using the old API */
1501 if (!spydata)
1502 return -EOPNOTSUPP;
1503
1504 wrqu->data.length = spydata->spy_number;
1505
1506 /* Copy addresses. */
1507 for (i = 0; i < spydata->spy_number; i++) {
1508 memcpy(address[i].sa_data, spydata->spy_address[i], ETH_ALEN);
1509 address[i].sa_family = AF_UNIX;
1510 }
1511 /* Copy stats to the user buffer (just after). */
1512 if (spydata->spy_number > 0)
1513 memcpy(extra + (sizeof(struct sockaddr) *spydata->spy_number),
1514 spydata->spy_stat,
1515 sizeof(struct iw_quality) * spydata->spy_number);
1516 /* Reset updated flags. */
1517 for (i = 0; i < spydata->spy_number; i++)
1518 spydata->spy_stat[i].updated &= ~IW_QUAL_ALL_UPDATED;
1519 return 0;
1520 }
1521 EXPORT_SYMBOL(iw_handler_get_spy);
1522
1523 /*------------------------------------------------------------------*/
1524 /*
1525 * Standard Wireless Handler : set spy threshold
1526 */
1527 int iw_handler_set_thrspy(struct net_device * dev,
1528 struct iw_request_info *info,
1529 union iwreq_data * wrqu,
1530 char * extra)
1531 {
1532 struct iw_spy_data * spydata = get_spydata(dev);
1533 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
1534
1535 /* Make sure driver is not buggy or using the old API */
1536 if (!spydata)
1537 return -EOPNOTSUPP;
1538
1539 /* Just do it */
1540 memcpy(&(spydata->spy_thr_low), &(threshold->low),
1541 2 * sizeof(struct iw_quality));
1542
1543 /* Clear flag */
1544 memset(spydata->spy_thr_under, '\0', sizeof(spydata->spy_thr_under));
1545
1546 return 0;
1547 }
1548 EXPORT_SYMBOL(iw_handler_set_thrspy);
1549
1550 /*------------------------------------------------------------------*/
1551 /*
1552 * Standard Wireless Handler : get spy threshold
1553 */
1554 int iw_handler_get_thrspy(struct net_device * dev,
1555 struct iw_request_info *info,
1556 union iwreq_data * wrqu,
1557 char * extra)
1558 {
1559 struct iw_spy_data * spydata = get_spydata(dev);
1560 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
1561
1562 /* Make sure driver is not buggy or using the old API */
1563 if (!spydata)
1564 return -EOPNOTSUPP;
1565
1566 /* Just do it */
1567 memcpy(&(threshold->low), &(spydata->spy_thr_low),
1568 2 * sizeof(struct iw_quality));
1569
1570 return 0;
1571 }
1572 EXPORT_SYMBOL(iw_handler_get_thrspy);
1573
1574 /*------------------------------------------------------------------*/
1575 /*
1576 * Prepare and send a Spy Threshold event
1577 */
1578 static void iw_send_thrspy_event(struct net_device * dev,
1579 struct iw_spy_data * spydata,
1580 unsigned char * address,
1581 struct iw_quality * wstats)
1582 {
1583 union iwreq_data wrqu;
1584 struct iw_thrspy threshold;
1585
1586 /* Init */
1587 wrqu.data.length = 1;
1588 wrqu.data.flags = 0;
1589 /* Copy address */
1590 memcpy(threshold.addr.sa_data, address, ETH_ALEN);
1591 threshold.addr.sa_family = ARPHRD_ETHER;
1592 /* Copy stats */
1593 memcpy(&(threshold.qual), wstats, sizeof(struct iw_quality));
1594 /* Copy also thresholds */
1595 memcpy(&(threshold.low), &(spydata->spy_thr_low),
1596 2 * sizeof(struct iw_quality));
1597
1598 /* Send event to user space */
1599 wireless_send_event(dev, SIOCGIWTHRSPY, &wrqu, (char *) &threshold);
1600 }
1601
1602 /* ---------------------------------------------------------------- */
1603 /*
1604 * Call for the driver to update the spy data.
1605 * For now, the spy data is a simple array. As the size of the array is
1606 * small, this is good enough. If we wanted to support larger number of
1607 * spy addresses, we should use something more efficient...
1608 */
1609 void wireless_spy_update(struct net_device * dev,
1610 unsigned char * address,
1611 struct iw_quality * wstats)
1612 {
1613 struct iw_spy_data * spydata = get_spydata(dev);
1614 int i;
1615 int match = -1;
1616
1617 /* Make sure driver is not buggy or using the old API */
1618 if (!spydata)
1619 return;
1620
1621 /* Update all records that match */
1622 for (i = 0; i < spydata->spy_number; i++)
1623 if (!compare_ether_addr(address, spydata->spy_address[i])) {
1624 memcpy(&(spydata->spy_stat[i]), wstats,
1625 sizeof(struct iw_quality));
1626 match = i;
1627 }
1628
1629 /* Generate an event if we cross the spy threshold.
1630 * To avoid event storms, we have a simple hysteresis : we generate
1631 * event only when we go under the low threshold or above the
1632 * high threshold. */
1633 if (match >= 0) {
1634 if (spydata->spy_thr_under[match]) {
1635 if (wstats->level > spydata->spy_thr_high.level) {
1636 spydata->spy_thr_under[match] = 0;
1637 iw_send_thrspy_event(dev, spydata,
1638 address, wstats);
1639 }
1640 } else {
1641 if (wstats->level < spydata->spy_thr_low.level) {
1642 spydata->spy_thr_under[match] = 1;
1643 iw_send_thrspy_event(dev, spydata,
1644 address, wstats);
1645 }
1646 }
1647 }
1648 }
1649 EXPORT_SYMBOL(wireless_spy_update);
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