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[NET]: fix-up schedule_timeout() usage
[deliverable/linux.git] / net / core / wireless.c
CommitLineData
1da177e4
LT		 1/*
2 * This file implement the Wireless Extensions APIs.
3 *
4 * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
fff9cfd9 5 * Copyright (c) 1997-2005 Jean Tourrilhes, All Rights Reserved.
1da177e4
LT		 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
6582c164
JT		 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)
1da177e4
LT		 68 */
69
70/***************************** INCLUDES *****************************/
71
72#include <linux/config.h> /* Not needed ??? */
73#include <linux/module.h>
74#include <linux/types.h> /* off_t */
75#include <linux/netdevice.h> /* struct ifreq, dev_get_by_name() */
76#include <linux/proc_fs.h>
77#include <linux/rtnetlink.h> /* rtnetlink stuff */
78#include <linux/seq_file.h>
79#include <linux/init.h> /* for __init */
80#include <linux/if_arp.h> /* ARPHRD_ETHER */
81
82#include <linux/wireless.h> /* Pretty obvious */
83#include <net/iw_handler.h> /* New driver API */
84
85#include <asm/uaccess.h> /* copy_to_user() */
86
87/**************************** CONSTANTS ****************************/
88
89/* Debugging stuff */
90#undef WE_IOCTL_DEBUG /* Debug IOCTL API */
91#undef WE_EVENT_DEBUG /* Debug Event dispatcher */
92#undef WE_SPY_DEBUG /* Debug enhanced spy support */
93
94/* Options */
95#define WE_EVENT_NETLINK /* Propagate events using rtnetlink */
96#define WE_SET_EVENT /* Generate an event on some set commands */
97
98/************************* GLOBAL VARIABLES *************************/
99/*
100 * You should not use global variables, because of re-entrancy.
101 * On our case, it's only const, so it's OK...
102 */
103/*
104 * Meta-data about all the standard Wireless Extension request we
105 * know about.
106 */
107static const struct iw_ioctl_description standard_ioctl[] = {
108 [SIOCSIWCOMMIT - SIOCIWFIRST] = {
109 .header_type = IW_HEADER_TYPE_NULL,
110 },
111 [SIOCGIWNAME - SIOCIWFIRST] = {
112 .header_type = IW_HEADER_TYPE_CHAR,
113 .flags = IW_DESCR_FLAG_DUMP,
114 },
115 [SIOCSIWNWID - SIOCIWFIRST] = {
116 .header_type = IW_HEADER_TYPE_PARAM,
117 .flags = IW_DESCR_FLAG_EVENT,
118 },
119 [SIOCGIWNWID - SIOCIWFIRST] = {
120 .header_type = IW_HEADER_TYPE_PARAM,
121 .flags = IW_DESCR_FLAG_DUMP,
122 },
123 [SIOCSIWFREQ - SIOCIWFIRST] = {
124 .header_type = IW_HEADER_TYPE_FREQ,
125 .flags = IW_DESCR_FLAG_EVENT,
126 },
127 [SIOCGIWFREQ - SIOCIWFIRST] = {
128 .header_type = IW_HEADER_TYPE_FREQ,
129 .flags = IW_DESCR_FLAG_DUMP,
130 },
131 [SIOCSIWMODE - SIOCIWFIRST] = {
132 .header_type = IW_HEADER_TYPE_UINT,
133 .flags = IW_DESCR_FLAG_EVENT,
134 },
135 [SIOCGIWMODE - SIOCIWFIRST] = {
136 .header_type = IW_HEADER_TYPE_UINT,
137 .flags = IW_DESCR_FLAG_DUMP,
138 },
139 [SIOCSIWSENS - SIOCIWFIRST] = {
140 .header_type = IW_HEADER_TYPE_PARAM,
141 },
142 [SIOCGIWSENS - SIOCIWFIRST] = {
143 .header_type = IW_HEADER_TYPE_PARAM,
144 },
145 [SIOCSIWRANGE - SIOCIWFIRST] = {
146 .header_type = IW_HEADER_TYPE_NULL,
147 },
148 [SIOCGIWRANGE - SIOCIWFIRST] = {
149 .header_type = IW_HEADER_TYPE_POINT,
150 .token_size = 1,
151 .max_tokens = sizeof(struct iw_range),
152 .flags = IW_DESCR_FLAG_DUMP,
153 },
154 [SIOCSIWPRIV - SIOCIWFIRST] = {
155 .header_type = IW_HEADER_TYPE_NULL,
156 },
157 [SIOCGIWPRIV - SIOCIWFIRST] = { /* (handled directly by us) */
158 .header_type = IW_HEADER_TYPE_NULL,
159 },
160 [SIOCSIWSTATS - SIOCIWFIRST] = {
161 .header_type = IW_HEADER_TYPE_NULL,
162 },
163 [SIOCGIWSTATS - SIOCIWFIRST] = { /* (handled directly by us) */
164 .header_type = IW_HEADER_TYPE_NULL,
165 .flags = IW_DESCR_FLAG_DUMP,
166 },
167 [SIOCSIWSPY - SIOCIWFIRST] = {
168 .header_type = IW_HEADER_TYPE_POINT,
169 .token_size = sizeof(struct sockaddr),
170 .max_tokens = IW_MAX_SPY,
171 },
172 [SIOCGIWSPY - SIOCIWFIRST] = {
173 .header_type = IW_HEADER_TYPE_POINT,
174 .token_size = sizeof(struct sockaddr) +
175 sizeof(struct iw_quality),
176 .max_tokens = IW_MAX_SPY,
177 },
178 [SIOCSIWTHRSPY - SIOCIWFIRST] = {
179 .header_type = IW_HEADER_TYPE_POINT,
180 .token_size = sizeof(struct iw_thrspy),
181 .min_tokens = 1,
182 .max_tokens = 1,
183 },
184 [SIOCGIWTHRSPY - SIOCIWFIRST] = {
185 .header_type = IW_HEADER_TYPE_POINT,
186 .token_size = sizeof(struct iw_thrspy),
187 .min_tokens = 1,
188 .max_tokens = 1,
189 },
190 [SIOCSIWAP - SIOCIWFIRST] = {
191 .header_type = IW_HEADER_TYPE_ADDR,
192 },
193 [SIOCGIWAP - SIOCIWFIRST] = {
194 .header_type = IW_HEADER_TYPE_ADDR,
195 .flags = IW_DESCR_FLAG_DUMP,
196 },
fff9cfd9 197 [SIOCSIWMLME - SIOCIWFIRST] = {
198 .header_type = IW_HEADER_TYPE_POINT,
199 .token_size = 1,
200 .min_tokens = sizeof(struct iw_mlme),
201 .max_tokens = sizeof(struct iw_mlme),
202 },
1da177e4
LT		 203 [SIOCGIWAPLIST - SIOCIWFIRST] = {
204 .header_type = IW_HEADER_TYPE_POINT,
205 .token_size = sizeof(struct sockaddr) +
206 sizeof(struct iw_quality),
207 .max_tokens = IW_MAX_AP,
208 .flags = IW_DESCR_FLAG_NOMAX,
209 },
210 [SIOCSIWSCAN - SIOCIWFIRST] = {
fff9cfd9 211 .header_type = IW_HEADER_TYPE_POINT,
212 .token_size = 1,
213 .min_tokens = 0,
214 .max_tokens = sizeof(struct iw_scan_req),
1da177e4
LT		 215 },
216 [SIOCGIWSCAN - SIOCIWFIRST] = {
217 .header_type = IW_HEADER_TYPE_POINT,
218 .token_size = 1,
219 .max_tokens = IW_SCAN_MAX_DATA,
220 .flags = IW_DESCR_FLAG_NOMAX,
221 },
222 [SIOCSIWESSID - SIOCIWFIRST] = {
223 .header_type = IW_HEADER_TYPE_POINT,
224 .token_size = 1,
225 .max_tokens = IW_ESSID_MAX_SIZE + 1,
226 .flags = IW_DESCR_FLAG_EVENT,
227 },
228 [SIOCGIWESSID - SIOCIWFIRST] = {
229 .header_type = IW_HEADER_TYPE_POINT,
230 .token_size = 1,
231 .max_tokens = IW_ESSID_MAX_SIZE + 1,
232 .flags = IW_DESCR_FLAG_DUMP,
233 },
234 [SIOCSIWNICKN - SIOCIWFIRST] = {
235 .header_type = IW_HEADER_TYPE_POINT,
236 .token_size = 1,
237 .max_tokens = IW_ESSID_MAX_SIZE + 1,
238 },
239 [SIOCGIWNICKN - SIOCIWFIRST] = {
240 .header_type = IW_HEADER_TYPE_POINT,
241 .token_size = 1,
242 .max_tokens = IW_ESSID_MAX_SIZE + 1,
243 },
244 [SIOCSIWRATE - SIOCIWFIRST] = {
245 .header_type = IW_HEADER_TYPE_PARAM,
246 },
247 [SIOCGIWRATE - SIOCIWFIRST] = {
248 .header_type = IW_HEADER_TYPE_PARAM,
249 },
250 [SIOCSIWRTS - SIOCIWFIRST] = {
251 .header_type = IW_HEADER_TYPE_PARAM,
252 },
253 [SIOCGIWRTS - SIOCIWFIRST] = {
254 .header_type = IW_HEADER_TYPE_PARAM,
255 },
256 [SIOCSIWFRAG - SIOCIWFIRST] = {
257 .header_type = IW_HEADER_TYPE_PARAM,
258 },
259 [SIOCGIWFRAG - SIOCIWFIRST] = {
260 .header_type = IW_HEADER_TYPE_PARAM,
261 },
262 [SIOCSIWTXPOW - SIOCIWFIRST] = {
263 .header_type = IW_HEADER_TYPE_PARAM,
264 },
265 [SIOCGIWTXPOW - SIOCIWFIRST] = {
266 .header_type = IW_HEADER_TYPE_PARAM,
267 },
268 [SIOCSIWRETRY - SIOCIWFIRST] = {
269 .header_type = IW_HEADER_TYPE_PARAM,
270 },
271 [SIOCGIWRETRY - SIOCIWFIRST] = {
272 .header_type = IW_HEADER_TYPE_PARAM,
273 },
274 [SIOCSIWENCODE - SIOCIWFIRST] = {
275 .header_type = IW_HEADER_TYPE_POINT,
276 .token_size = 1,
277 .max_tokens = IW_ENCODING_TOKEN_MAX,
278 .flags = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
279 },
280 [SIOCGIWENCODE - SIOCIWFIRST] = {
281 .header_type = IW_HEADER_TYPE_POINT,
282 .token_size = 1,
283 .max_tokens = IW_ENCODING_TOKEN_MAX,
284 .flags = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
285 },
286 [SIOCSIWPOWER - SIOCIWFIRST] = {
287 .header_type = IW_HEADER_TYPE_PARAM,
288 },
289 [SIOCGIWPOWER - SIOCIWFIRST] = {
290 .header_type = IW_HEADER_TYPE_PARAM,
291 },
fff9cfd9 292 [SIOCSIWGENIE - SIOCIWFIRST] = {
293 .header_type = IW_HEADER_TYPE_POINT,
294 .token_size = 1,
295 .max_tokens = IW_GENERIC_IE_MAX,
296 },
297 [SIOCGIWGENIE - SIOCIWFIRST] = {
298 .header_type = IW_HEADER_TYPE_POINT,
299 .token_size = 1,
300 .max_tokens = IW_GENERIC_IE_MAX,
301 },
302 [SIOCSIWAUTH - SIOCIWFIRST] = {
303 .header_type = IW_HEADER_TYPE_PARAM,
304 },
305 [SIOCGIWAUTH - SIOCIWFIRST] = {
306 .header_type = IW_HEADER_TYPE_PARAM,
307 },
308 [SIOCSIWENCODEEXT - SIOCIWFIRST] = {
309 .header_type = IW_HEADER_TYPE_POINT,
310 .token_size = 1,
311 .min_tokens = sizeof(struct iw_encode_ext),
312 .max_tokens = sizeof(struct iw_encode_ext) +
313 IW_ENCODING_TOKEN_MAX,
314 },
315 [SIOCGIWENCODEEXT - SIOCIWFIRST] = {
316 .header_type = IW_HEADER_TYPE_POINT,
317 .token_size = 1,
318 .min_tokens = sizeof(struct iw_encode_ext),
319 .max_tokens = sizeof(struct iw_encode_ext) +
320 IW_ENCODING_TOKEN_MAX,
321 },
322 [SIOCSIWPMKSA - SIOCIWFIRST] = {
323 .header_type = IW_HEADER_TYPE_POINT,
324 .token_size = 1,
325 .min_tokens = sizeof(struct iw_pmksa),
326 .max_tokens = sizeof(struct iw_pmksa),
327 },
1da177e4
LT		 328};
329static const int standard_ioctl_num = (sizeof(standard_ioctl) /
330 sizeof(struct iw_ioctl_description));
331
332/*
333 * Meta-data about all the additional standard Wireless Extension events
334 * we know about.
335 */
336static const struct iw_ioctl_description standard_event[] = {
337 [IWEVTXDROP - IWEVFIRST] = {
338 .header_type = IW_HEADER_TYPE_ADDR,
339 },
340 [IWEVQUAL - IWEVFIRST] = {
341 .header_type = IW_HEADER_TYPE_QUAL,
342 },
343 [IWEVCUSTOM - IWEVFIRST] = {
344 .header_type = IW_HEADER_TYPE_POINT,
345 .token_size = 1,
346 .max_tokens = IW_CUSTOM_MAX,
347 },
348 [IWEVREGISTERED - IWEVFIRST] = {
349 .header_type = IW_HEADER_TYPE_ADDR,
350 },
351 [IWEVEXPIRED - IWEVFIRST] = {
352 .header_type = IW_HEADER_TYPE_ADDR,
353 },
fff9cfd9 354 [IWEVGENIE - IWEVFIRST] = {
355 .header_type = IW_HEADER_TYPE_POINT,
356 .token_size = 1,
357 .max_tokens = IW_GENERIC_IE_MAX,
358 },
359 [IWEVMICHAELMICFAILURE - IWEVFIRST] = {
360 .header_type = IW_HEADER_TYPE_POINT,
361 .token_size = 1,
362 .max_tokens = sizeof(struct iw_michaelmicfailure),
363 },
364 [IWEVASSOCREQIE - IWEVFIRST] = {
365 .header_type = IW_HEADER_TYPE_POINT,
366 .token_size = 1,
367 .max_tokens = IW_GENERIC_IE_MAX,
368 },
369 [IWEVASSOCRESPIE - IWEVFIRST] = {
370 .header_type = IW_HEADER_TYPE_POINT,
371 .token_size = 1,
372 .max_tokens = IW_GENERIC_IE_MAX,
373 },
374 [IWEVPMKIDCAND - IWEVFIRST] = {
375 .header_type = IW_HEADER_TYPE_POINT,
376 .token_size = 1,
377 .max_tokens = sizeof(struct iw_pmkid_cand),
378 },
1da177e4
LT		 379};
380static const int standard_event_num = (sizeof(standard_event) /
381 sizeof(struct iw_ioctl_description));
382
383/* Size (in bytes) of the various private data types */
384static const char iw_priv_type_size[] = {
385 0, /* IW_PRIV_TYPE_NONE */
386 1, /* IW_PRIV_TYPE_BYTE */
387 1, /* IW_PRIV_TYPE_CHAR */
388 0, /* Not defined */
389 sizeof(__u32), /* IW_PRIV_TYPE_INT */
390 sizeof(struct iw_freq), /* IW_PRIV_TYPE_FLOAT */
391 sizeof(struct sockaddr), /* IW_PRIV_TYPE_ADDR */
392 0, /* Not defined */
393};
394
395/* Size (in bytes) of various events */
396static const int event_type_size[] = {
397 IW_EV_LCP_LEN, /* IW_HEADER_TYPE_NULL */
398 0,
399 IW_EV_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
400 0,
401 IW_EV_UINT_LEN, /* IW_HEADER_TYPE_UINT */
402 IW_EV_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
403 IW_EV_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
404 0,
405 IW_EV_POINT_LEN, /* Without variable payload */
406 IW_EV_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
407 IW_EV_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
408};
409
410/************************ COMMON SUBROUTINES ************************/
411/*
412 * Stuff that may be used in various place or doesn't fit in one
413 * of the section below.
414 */
415
416/* ---------------------------------------------------------------- */
417/*
418 * Return the driver handler associated with a specific Wireless Extension.
419 * Called from various place, so make sure it remains efficient.
420 */
421static inline iw_handler get_handler(struct net_device *dev,
422 unsigned int cmd)
423{
424 /* Don't "optimise" the following variable, it will crash */
425 unsigned int index; /* *MUST* be unsigned */
426
427 /* Check if we have some wireless handlers defined */
428 if(dev->wireless_handlers == NULL)
429 return NULL;
430
431 /* Try as a standard command */
432 index = cmd - SIOCIWFIRST;
433 if(index < dev->wireless_handlers->num_standard)
434 return dev->wireless_handlers->standard[index];
435
436 /* Try as a private command */
437 index = cmd - SIOCIWFIRSTPRIV;
438 if(index < dev->wireless_handlers->num_private)
439 return dev->wireless_handlers->private[index];
440
441 /* Not found */
442 return NULL;
443}
444
445/* ---------------------------------------------------------------- */
446/*
447 * Get statistics out of the driver
448 */
449static inline struct iw_statistics *get_wireless_stats(struct net_device *dev)
450{
451 /* New location */
452 if((dev->wireless_handlers != NULL) &&
453 (dev->wireless_handlers->get_wireless_stats != NULL))
454 return dev->wireless_handlers->get_wireless_stats(dev);
455
6582c164
JT		 456 /* Old location, field to be removed in next WE */
457 if(dev->get_wireless_stats) {
458 printk(KERN_DEBUG "%s (WE) : Driver using old /proc/net/wireless support, please fix driver !\n",
459 dev->name);
460 return dev->get_wireless_stats(dev);
461 }
462 /* Not found */
463 return (struct iw_statistics *) NULL;
1da177e4
LT		 464}
465
466/* ---------------------------------------------------------------- */
467/*
468 * Call the commit handler in the driver
469 * (if exist and if conditions are right)
470 *
471 * Note : our current commit strategy is currently pretty dumb,
472 * but we will be able to improve on that...
473 * The goal is to try to agreagate as many changes as possible
474 * before doing the commit. Drivers that will define a commit handler
475 * are usually those that need a reset after changing parameters, so
476 * we want to minimise the number of reset.
477 * A cool idea is to use a timer : at each "set" command, we re-set the
478 * timer, when the timer eventually fires, we call the driver.
479 * Hopefully, more on that later.
480 *
481 * Also, I'm waiting to see how many people will complain about the
482 * netif_running(dev) test. I'm open on that one...
483 * Hopefully, the driver will remember to do a commit in "open()" ;-)
484 */
485static inline int call_commit_handler(struct net_device * dev)
486{
487 if((netif_running(dev)) &&
488 (dev->wireless_handlers->standard[0] != NULL)) {
489 /* Call the commit handler on the driver */
490 return dev->wireless_handlers->standard[0](dev, NULL,
491 NULL, NULL);
492 } else
493 return 0; /* Command completed successfully */
494}
495
496/* ---------------------------------------------------------------- */
497/*
498 * Calculate size of private arguments
499 */
500static inline int get_priv_size(__u16 args)
501{
502 int num = args & IW_PRIV_SIZE_MASK;
503 int type = (args & IW_PRIV_TYPE_MASK) >> 12;
504
505 return num * iw_priv_type_size[type];
506}
507
508/* ---------------------------------------------------------------- */
509/*
510 * Re-calculate the size of private arguments
511 */
512static inline int adjust_priv_size(__u16 args,
513 union iwreq_data * wrqu)
514{
515 int num = wrqu->data.length;
516 int max = args & IW_PRIV_SIZE_MASK;
517 int type = (args & IW_PRIV_TYPE_MASK) >> 12;
518
519 /* Make sure the driver doesn't goof up */
520 if (max < num)
521 num = max;
522
523 return num * iw_priv_type_size[type];
524}
525
526
527/******************** /proc/net/wireless SUPPORT ********************/
528/*
529 * The /proc/net/wireless file is a human readable user-space interface
530 * exporting various wireless specific statistics from the wireless devices.
531 * This is the most popular part of the Wireless Extensions ;-)
532 *
533 * This interface is a pure clone of /proc/net/dev (in net/core/dev.c).
534 * The content of the file is basically the content of "struct iw_statistics".
535 */
536
537#ifdef CONFIG_PROC_FS
538
539/* ---------------------------------------------------------------- */
540/*
541 * Print one entry (line) of /proc/net/wireless
542 */
543static __inline__ void wireless_seq_printf_stats(struct seq_file *seq,
544 struct net_device *dev)
545{
546 /* Get stats from the driver */
547 struct iw_statistics *stats = get_wireless_stats(dev);
548
549 if (stats) {
550 seq_printf(seq, "%6s: %04x %3d%c %3d%c %3d%c %6d %6d %6d "
551 "%6d %6d %6d\n",
552 dev->name, stats->status, stats->qual.qual,
553 stats->qual.updated & IW_QUAL_QUAL_UPDATED
554 ? '.' : ' ',
6582c164
JT		 555 ((__s32) stats->qual.level) -
556 ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
1da177e4
LT		 557 stats->qual.updated & IW_QUAL_LEVEL_UPDATED
558 ? '.' : ' ',
6582c164
JT		 559 ((__s32) stats->qual.noise) -
560 ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
1da177e4
LT		 561 stats->qual.updated & IW_QUAL_NOISE_UPDATED
562 ? '.' : ' ',
563 stats->discard.nwid, stats->discard.code,
564 stats->discard.fragment, stats->discard.retries,
565 stats->discard.misc, stats->miss.beacon);
6582c164 566 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
1da177e4
LT		 567 }
568}
569
570/* ---------------------------------------------------------------- */
571/*
572 * Print info for /proc/net/wireless (print all entries)
573 */
574static int wireless_seq_show(struct seq_file *seq, void *v)
575{
576 if (v == SEQ_START_TOKEN)
577 seq_printf(seq, "Inter-| sta-| Quality | Discarded "
578 "packets | Missed | WE\n"
579 " face | tus | link level noise | nwid "
580 "crypt frag retry misc | beacon | %d\n",
581 WIRELESS_EXT);
582 else
583 wireless_seq_printf_stats(seq, v);
584 return 0;
585}
586
1da177e4
LT		 587static struct seq_operations wireless_seq_ops = {
588 .start = dev_seq_start,
589 .next = dev_seq_next,
590 .stop = dev_seq_stop,
591 .show = wireless_seq_show,
592};
593
594static int wireless_seq_open(struct inode *inode, struct file *file)
595{
596 return seq_open(file, &wireless_seq_ops);
597}
598
599static struct file_operations wireless_seq_fops = {
600 .owner = THIS_MODULE,
601 .open = wireless_seq_open,
602 .read = seq_read,
603 .llseek = seq_lseek,
604 .release = seq_release,
605};
606
607int __init wireless_proc_init(void)
608{
6582c164 609 /* Create /proc/net/wireless entry */
1da177e4
LT		 610 if (!proc_net_fops_create("wireless", S_IRUGO, &wireless_seq_fops))
611 return -ENOMEM;
612
613 return 0;
614}
615#endif /* CONFIG_PROC_FS */
616
617/************************** IOCTL SUPPORT **************************/
618/*
619 * The original user space API to configure all those Wireless Extensions
620 * is through IOCTLs.
621 * In there, we check if we need to call the new driver API (iw_handler)
622 * or just call the driver ioctl handler.
623 */
624
625/* ---------------------------------------------------------------- */
626/*
627 * Allow programatic access to /proc/net/wireless even if /proc
628 * doesn't exist... Also more efficient...
629 */
630static inline int dev_iwstats(struct net_device *dev, struct ifreq *ifr)
631{
632 /* Get stats from the driver */
633 struct iw_statistics *stats;
634
635 stats = get_wireless_stats(dev);
636 if (stats != (struct iw_statistics *) NULL) {
637 struct iwreq * wrq = (struct iwreq *)ifr;
638
639 /* Copy statistics to the user buffer */
640 if(copy_to_user(wrq->u.data.pointer, stats,
641 sizeof(struct iw_statistics)))
642 return -EFAULT;
643
6582c164 644 /* Check if we need to clear the updated flag */
1da177e4 645 if(wrq->u.data.flags != 0)
6582c164 646 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
1da177e4
LT		 647 return 0;
648 } else
649 return -EOPNOTSUPP;
650}
651
652/* ---------------------------------------------------------------- */
653/*
654 * Export the driver private handler definition
655 * They will be picked up by tools like iwpriv...
656 */
657static inline int ioctl_export_private(struct net_device * dev,
658 struct ifreq * ifr)
659{
660 struct iwreq * iwr = (struct iwreq *) ifr;
661
662 /* Check if the driver has something to export */
663 if((dev->wireless_handlers->num_private_args == 0) ||
664 (dev->wireless_handlers->private_args == NULL))
665 return -EOPNOTSUPP;
666
667 /* Check NULL pointer */
668 if(iwr->u.data.pointer == NULL)
669 return -EFAULT;
670
671 /* Check if there is enough buffer up there */
672 if(iwr->u.data.length < dev->wireless_handlers->num_private_args) {
673 /* User space can't know in advance how large the buffer
674 * needs to be. Give it a hint, so that we can support
675 * any size buffer we want somewhat efficiently... */
676 iwr->u.data.length = dev->wireless_handlers->num_private_args;
677 return -E2BIG;
678 }
679
680 /* Set the number of available ioctls. */
681 iwr->u.data.length = dev->wireless_handlers->num_private_args;
682
683 /* Copy structure to the user buffer. */
684 if (copy_to_user(iwr->u.data.pointer,
685 dev->wireless_handlers->private_args,
686 sizeof(struct iw_priv_args) * iwr->u.data.length))
687 return -EFAULT;
688
689 return 0;
690}
691
692/* ---------------------------------------------------------------- */
693/*
694 * Wrapper to call a standard Wireless Extension handler.
695 * We do various checks and also take care of moving data between
696 * user space and kernel space.
697 */
698static inline int ioctl_standard_call(struct net_device * dev,
699 struct ifreq * ifr,
700 unsigned int cmd,
701 iw_handler handler)
702{
703 struct iwreq * iwr = (struct iwreq *) ifr;
704 const struct iw_ioctl_description * descr;
705 struct iw_request_info info;
706 int ret = -EINVAL;
707
708 /* Get the description of the IOCTL */
709 if((cmd - SIOCIWFIRST) >= standard_ioctl_num)
710 return -EOPNOTSUPP;
711 descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
712
713#ifdef WE_IOCTL_DEBUG
714 printk(KERN_DEBUG "%s (WE) : Found standard handler for 0x%04X\n",
715 ifr->ifr_name, cmd);
716 printk(KERN_DEBUG "%s (WE) : Header type : %d, Token type : %d, size : %d, token : %d\n", dev->name, descr->header_type, descr->token_type, descr->token_size, descr->max_tokens);
717#endif /* WE_IOCTL_DEBUG */
718
719 /* Prepare the call */
720 info.cmd = cmd;
721 info.flags = 0;
722
723 /* Check if we have a pointer to user space data or not */
724 if(descr->header_type != IW_HEADER_TYPE_POINT) {
725
726 /* No extra arguments. Trivial to handle */
727 ret = handler(dev, &info, &(iwr->u), NULL);
728
729#ifdef WE_SET_EVENT
730 /* Generate an event to notify listeners of the change */
731 if((descr->flags & IW_DESCR_FLAG_EVENT) &&
732 ((ret == 0) || (ret == -EIWCOMMIT)))
733 wireless_send_event(dev, cmd, &(iwr->u), NULL);
734#endif /* WE_SET_EVENT */
735 } else {
736 char * extra;
737 int extra_size;
738 int user_length = 0;
739 int err;
740
741 /* Calculate space needed by arguments. Always allocate
742 * for max space. Easier, and won't last long... */
743 extra_size = descr->max_tokens * descr->token_size;
744
745 /* Check what user space is giving us */
746 if(IW_IS_SET(cmd)) {
747 /* Check NULL pointer */
748 if((iwr->u.data.pointer == NULL) &&
749 (iwr->u.data.length != 0))
750 return -EFAULT;
751 /* Check if number of token fits within bounds */
752 if(iwr->u.data.length > descr->max_tokens)
753 return -E2BIG;
754 if(iwr->u.data.length < descr->min_tokens)
755 return -EINVAL;
756 } else {
757 /* Check NULL pointer */
758 if(iwr->u.data.pointer == NULL)
759 return -EFAULT;
760 /* Save user space buffer size for checking */
761 user_length = iwr->u.data.length;
762
763 /* Don't check if user_length > max to allow forward
764 * compatibility. The test user_length < min is
765 * implied by the test at the end. */
766
767 /* Support for very large requests */
768 if((descr->flags & IW_DESCR_FLAG_NOMAX) &&
769 (user_length > descr->max_tokens)) {
770 /* Allow userspace to GET more than max so
771 * we can support any size GET requests.
772 * There is still a limit : -ENOMEM. */
773 extra_size = user_length * descr->token_size;
774 /* Note : user_length is originally a __u16,
775 * and token_size is controlled by us,
776 * so extra_size won't get negative and
777 * won't overflow... */
778 }
779 }
780
781#ifdef WE_IOCTL_DEBUG
782 printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n",
783 dev->name, extra_size);
784#endif /* WE_IOCTL_DEBUG */
785
786 /* Create the kernel buffer */
787 extra = kmalloc(extra_size, GFP_KERNEL);
788 if (extra == NULL) {
789 return -ENOMEM;
790 }
791
792 /* If it is a SET, get all the extra data in here */
793 if(IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
794 err = copy_from_user(extra, iwr->u.data.pointer,
795 iwr->u.data.length *
796 descr->token_size);
797 if (err) {
798 kfree(extra);
799 return -EFAULT;
800 }
801#ifdef WE_IOCTL_DEBUG
802 printk(KERN_DEBUG "%s (WE) : Got %d bytes\n",
803 dev->name,
804 iwr->u.data.length * descr->token_size);
805#endif /* WE_IOCTL_DEBUG */
806 }
807
808 /* Call the handler */
809 ret = handler(dev, &info, &(iwr->u), extra);
810
811 /* If we have something to return to the user */
812 if (!ret && IW_IS_GET(cmd)) {
813 /* Check if there is enough buffer up there */
814 if(user_length < iwr->u.data.length) {
815 kfree(extra);
816 return -E2BIG;
817 }
818
819 err = copy_to_user(iwr->u.data.pointer, extra,
820 iwr->u.data.length *
821 descr->token_size);
822 if (err)
823 ret = -EFAULT;
824#ifdef WE_IOCTL_DEBUG
825 printk(KERN_DEBUG "%s (WE) : Wrote %d bytes\n",
826 dev->name,
827 iwr->u.data.length * descr->token_size);
828#endif /* WE_IOCTL_DEBUG */
829 }
830
831#ifdef WE_SET_EVENT
832 /* Generate an event to notify listeners of the change */
833 if((descr->flags & IW_DESCR_FLAG_EVENT) &&
834 ((ret == 0) || (ret == -EIWCOMMIT))) {
835 if(descr->flags & IW_DESCR_FLAG_RESTRICT)
836 /* If the event is restricted, don't
837 * export the payload */
838 wireless_send_event(dev, cmd, &(iwr->u), NULL);
839 else
840 wireless_send_event(dev, cmd, &(iwr->u),
841 extra);
842 }
843#endif /* WE_SET_EVENT */
844
845 /* Cleanup - I told you it wasn't that long ;-) */
846 kfree(extra);
847 }
848
849 /* Call commit handler if needed and defined */
850 if(ret == -EIWCOMMIT)
851 ret = call_commit_handler(dev);
852
853 /* Here, we will generate the appropriate event if needed */
854
855 return ret;
856}
857
858/* ---------------------------------------------------------------- */
859/*
860 * Wrapper to call a private Wireless Extension handler.
861 * We do various checks and also take care of moving data between
862 * user space and kernel space.
863 * It's not as nice and slimline as the standard wrapper. The cause
864 * is struct iw_priv_args, which was not really designed for the
865 * job we are going here.
866 *
867 * IMPORTANT : This function prevent to set and get data on the same
868 * IOCTL and enforce the SET/GET convention. Not doing it would be
869 * far too hairy...
870 * If you need to set and get data at the same time, please don't use
871 * a iw_handler but process it in your ioctl handler (i.e. use the
872 * old driver API).
873 */
874static inline int ioctl_private_call(struct net_device * dev,
875 struct ifreq * ifr,
876 unsigned int cmd,
877 iw_handler handler)
878{
879 struct iwreq * iwr = (struct iwreq *) ifr;
880 const struct iw_priv_args * descr = NULL;
881 struct iw_request_info info;
882 int extra_size = 0;
883 int i;
884 int ret = -EINVAL;
885
886 /* Get the description of the IOCTL */
887 for(i = 0; i < dev->wireless_handlers->num_private_args; i++)
888 if(cmd == dev->wireless_handlers->private_args[i].cmd) {
889 descr = &(dev->wireless_handlers->private_args[i]);
890 break;
891 }
892
893#ifdef WE_IOCTL_DEBUG
894 printk(KERN_DEBUG "%s (WE) : Found private handler for 0x%04X\n",
895 ifr->ifr_name, cmd);
896 if(descr) {
897 printk(KERN_DEBUG "%s (WE) : Name %s, set %X, get %X\n",
898 dev->name, descr->name,
899 descr->set_args, descr->get_args);
900 }
901#endif /* WE_IOCTL_DEBUG */
902
903 /* Compute the size of the set/get arguments */
904 if(descr != NULL) {
905 if(IW_IS_SET(cmd)) {
906 int offset = 0; /* For sub-ioctls */
907 /* Check for sub-ioctl handler */
908 if(descr->name[0] == '\0')
909 /* Reserve one int for sub-ioctl index */
910 offset = sizeof(__u32);
911
912 /* Size of set arguments */
913 extra_size = get_priv_size(descr->set_args);
914
915 /* Does it fits in iwr ? */
916 if((descr->set_args & IW_PRIV_SIZE_FIXED) &&
917 ((extra_size + offset) <= IFNAMSIZ))
918 extra_size = 0;
919 } else {
920 /* Size of get arguments */
921 extra_size = get_priv_size(descr->get_args);
922
923 /* Does it fits in iwr ? */
924 if((descr->get_args & IW_PRIV_SIZE_FIXED) &&
925 (extra_size <= IFNAMSIZ))
926 extra_size = 0;
927 }
928 }
929
930 /* Prepare the call */
931 info.cmd = cmd;
932 info.flags = 0;
933
934 /* Check if we have a pointer to user space data or not. */
935 if(extra_size == 0) {
936 /* No extra arguments. Trivial to handle */
937 ret = handler(dev, &info, &(iwr->u), (char *) &(iwr->u));
938 } else {
939 char * extra;
940 int err;
941
942 /* Check what user space is giving us */
943 if(IW_IS_SET(cmd)) {
944 /* Check NULL pointer */
945 if((iwr->u.data.pointer == NULL) &&
946 (iwr->u.data.length != 0))
947 return -EFAULT;
948
949 /* Does it fits within bounds ? */
950 if(iwr->u.data.length > (descr->set_args &
951 IW_PRIV_SIZE_MASK))
952 return -E2BIG;
953 } else {
954 /* Check NULL pointer */
955 if(iwr->u.data.pointer == NULL)
956 return -EFAULT;
957 }
958
959#ifdef WE_IOCTL_DEBUG
960 printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n",
961 dev->name, extra_size);
962#endif /* WE_IOCTL_DEBUG */
963
964 /* Always allocate for max space. Easier, and won't last
965 * long... */
966 extra = kmalloc(extra_size, GFP_KERNEL);
967 if (extra == NULL) {
968 return -ENOMEM;
969 }
970
971 /* If it is a SET, get all the extra data in here */
972 if(IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
973 err = copy_from_user(extra, iwr->u.data.pointer,
974 extra_size);
975 if (err) {
976 kfree(extra);
977 return -EFAULT;
978 }
979#ifdef WE_IOCTL_DEBUG
980 printk(KERN_DEBUG "%s (WE) : Got %d elem\n",
981 dev->name, iwr->u.data.length);
982#endif /* WE_IOCTL_DEBUG */
983 }
984
985 /* Call the handler */
986 ret = handler(dev, &info, &(iwr->u), extra);
987
988 /* If we have something to return to the user */
989 if (!ret && IW_IS_GET(cmd)) {
990
991 /* Adjust for the actual length if it's variable,
992 * avoid leaking kernel bits outside. */
993 if (!(descr->get_args & IW_PRIV_SIZE_FIXED)) {
994 extra_size = adjust_priv_size(descr->get_args,
995 &(iwr->u));
996 }
997
998 err = copy_to_user(iwr->u.data.pointer, extra,
999 extra_size);
1000 if (err)
1001 ret = -EFAULT;
1002#ifdef WE_IOCTL_DEBUG
1003 printk(KERN_DEBUG "%s (WE) : Wrote %d elem\n",
1004 dev->name, iwr->u.data.length);
1005#endif /* WE_IOCTL_DEBUG */
1006 }
1007
1008 /* Cleanup - I told you it wasn't that long ;-) */
1009 kfree(extra);
1010 }
1011
1012
1013 /* Call commit handler if needed and defined */
1014 if(ret == -EIWCOMMIT)
1015 ret = call_commit_handler(dev);
1016
1017 return ret;
1018}
1019
1020/* ---------------------------------------------------------------- */
1021/*
1022 * Main IOCTl dispatcher. Called from the main networking code
1023 * (dev_ioctl() in net/core/dev.c).
1024 * Check the type of IOCTL and call the appropriate wrapper...
1025 */
1026int wireless_process_ioctl(struct ifreq *ifr, unsigned int cmd)
1027{
1028 struct net_device *dev;
1029 iw_handler handler;
1030
1031 /* Permissions are already checked in dev_ioctl() before calling us.
1032 * The copy_to/from_user() of ifr is also dealt with in there */
1033
1034 /* Make sure the device exist */
1035 if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL)
1036 return -ENODEV;
1037
1038 /* A bunch of special cases, then the generic case...
1039 * Note that 'cmd' is already filtered in dev_ioctl() with
1040 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
1041 switch(cmd)
1042 {
1043 case SIOCGIWSTATS:
1044 /* Get Wireless Stats */
1045 return dev_iwstats(dev, ifr);
1046
1047 case SIOCGIWPRIV:
1048 /* Check if we have some wireless handlers defined */
1049 if(dev->wireless_handlers != NULL) {
1050 /* We export to user space the definition of
1051 * the private handler ourselves */
1052 return ioctl_export_private(dev, ifr);
1053 }
1054 // ## Fall-through for old API ##
1055 default:
1056 /* Generic IOCTL */
1057 /* Basic check */
1058 if (!netif_device_present(dev))
1059 return -ENODEV;
1060 /* New driver API : try to find the handler */
1061 handler = get_handler(dev, cmd);
1062 if(handler != NULL) {
1063 /* Standard and private are not the same */
1064 if(cmd < SIOCIWFIRSTPRIV)
1065 return ioctl_standard_call(dev,
1066 ifr,
1067 cmd,
1068 handler);
1069 else
1070 return ioctl_private_call(dev,
1071 ifr,
1072 cmd,
1073 handler);
1074 }
1075 /* Old driver API : call driver ioctl handler */
1076 if (dev->do_ioctl) {
1077 return dev->do_ioctl(dev, ifr, cmd);
1078 }
1079 return -EOPNOTSUPP;
1080 }
1081 /* Not reached */
1082 return -EINVAL;
1083}
1084
1085/************************* EVENT PROCESSING *************************/
1086/*
1087 * Process events generated by the wireless layer or the driver.
1088 * Most often, the event will be propagated through rtnetlink
1089 */
1090
1091#ifdef WE_EVENT_NETLINK
1092/* "rtnl" is defined in net/core/rtnetlink.c, but we need it here.
1093 * It is declared in <linux/rtnetlink.h> */
1094
1095/* ---------------------------------------------------------------- */
1096/*
1097 * Fill a rtnetlink message with our event data.
1098 * Note that we propage only the specified event and don't dump the
1099 * current wireless config. Dumping the wireless config is far too
1100 * expensive (for each parameter, the driver need to query the hardware).
1101 */
1102static inline int rtnetlink_fill_iwinfo(struct sk_buff * skb,
1103 struct net_device * dev,
1104 int type,
1105 char * event,
1106 int event_len)
1107{
1108 struct ifinfomsg *r;
1109 struct nlmsghdr *nlh;
1110 unsigned char *b = skb->tail;
1111
1112 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(*r));
1113 r = NLMSG_DATA(nlh);
1114 r->ifi_family = AF_UNSPEC;
9ef1d4c7 1115 r->__ifi_pad = 0;
1da177e4
LT		 1116 r->ifi_type = dev->type;
1117 r->ifi_index = dev->ifindex;
1118 r->ifi_flags = dev->flags;
1119 r->ifi_change = 0; /* Wireless changes don't affect those flags */
1120
1121 /* Add the wireless events in the netlink packet */
1122 RTA_PUT(skb, IFLA_WIRELESS,
1123 event_len, event);
1124
1125 nlh->nlmsg_len = skb->tail - b;
1126 return skb->len;
1127
1128nlmsg_failure:
1129rtattr_failure:
1130 skb_trim(skb, b - skb->data);
1131 return -1;
1132}
1133
1134/* ---------------------------------------------------------------- */
1135/*
1136 * Create and broadcast and send it on the standard rtnetlink socket
1137 * This is a pure clone rtmsg_ifinfo() in net/core/rtnetlink.c
1138 * Andrzej Krzysztofowicz mandated that I used a IFLA_XXX field
1139 * within a RTM_NEWLINK event.
1140 */
1141static inline void rtmsg_iwinfo(struct net_device * dev,
1142 char * event,
1143 int event_len)
1144{
1145 struct sk_buff *skb;
1146 int size = NLMSG_GOODSIZE;
1147
1148 skb = alloc_skb(size, GFP_ATOMIC);
1149 if (!skb)
1150 return;
1151
1152 if (rtnetlink_fill_iwinfo(skb, dev, RTM_NEWLINK,
1153 event, event_len) < 0) {
1154 kfree_skb(skb);
1155 return;
1156 }
ac6d439d
PM		 1157 NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
1158 netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_ATOMIC);
1da177e4
LT		 1159}
1160#endif /* WE_EVENT_NETLINK */
1161
1162/* ---------------------------------------------------------------- */
1163/*
1164 * Main event dispatcher. Called from other parts and drivers.
1165 * Send the event on the appropriate channels.
1166 * May be called from interrupt context.
1167 */
1168void wireless_send_event(struct net_device * dev,
1169 unsigned int cmd,
1170 union iwreq_data * wrqu,
1171 char * extra)
1172{
1173 const struct iw_ioctl_description * descr = NULL;
1174 int extra_len = 0;
1175 struct iw_event *event; /* Mallocated whole event */
1176 int event_len; /* Its size */
1177 int hdr_len; /* Size of the event header */
6582c164 1178 int wrqu_off = 0; /* Offset in wrqu */
1da177e4
LT		 1179 /* Don't "optimise" the following variable, it will crash */
1180 unsigned cmd_index; /* *MUST* be unsigned */
1181
6582c164 1182 /* Get the description of the Event */
1da177e4
LT		 1183 if(cmd <= SIOCIWLAST) {
1184 cmd_index = cmd - SIOCIWFIRST;
1185 if(cmd_index < standard_ioctl_num)
1186 descr = &(standard_ioctl[cmd_index]);
1187 } else {
1188 cmd_index = cmd - IWEVFIRST;
1189 if(cmd_index < standard_event_num)
1190 descr = &(standard_event[cmd_index]);
1191 }
1192 /* Don't accept unknown events */
1193 if(descr == NULL) {
1194 /* Note : we don't return an error to the driver, because
1195 * the driver would not know what to do about it. It can't
1196 * return an error to the user, because the event is not
1197 * initiated by a user request.
1198 * The best the driver could do is to log an error message.
1199 * We will do it ourselves instead...
1200 */
1201 printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
1202 dev->name, cmd);
1203 return;
1204 }
1205#ifdef WE_EVENT_DEBUG
1206 printk(KERN_DEBUG "%s (WE) : Got event 0x%04X\n",
1207 dev->name, cmd);
1208 printk(KERN_DEBUG "%s (WE) : Header type : %d, Token type : %d, size : %d, token : %d\n", dev->name, descr->header_type, descr->token_type, descr->token_size, descr->max_tokens);
1209#endif /* WE_EVENT_DEBUG */
1210
1211 /* Check extra parameters and set extra_len */
1212 if(descr->header_type == IW_HEADER_TYPE_POINT) {
1213 /* Check if number of token fits within bounds */
1214 if(wrqu->data.length > descr->max_tokens) {
1215 printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length);
1216 return;
1217 }
1218 if(wrqu->data.length < descr->min_tokens) {
1219 printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, wrqu->data.length);
1220 return;
1221 }
1222 /* Calculate extra_len - extra is NULL for restricted events */
1223 if(extra != NULL)
1224 extra_len = wrqu->data.length * descr->token_size;
6582c164
JT		 1225 /* Always at an offset in wrqu */
1226 wrqu_off = IW_EV_POINT_OFF;
1da177e4
LT		 1227#ifdef WE_EVENT_DEBUG
1228 printk(KERN_DEBUG "%s (WE) : Event 0x%04X, tokens %d, extra_len %d\n", dev->name, cmd, wrqu->data.length, extra_len);
1229#endif /* WE_EVENT_DEBUG */
1230 }
1231
1232 /* Total length of the event */
1233 hdr_len = event_type_size[descr->header_type];
1234 event_len = hdr_len + extra_len;
1235
1236#ifdef WE_EVENT_DEBUG
6582c164 1237 printk(KERN_DEBUG "%s (WE) : Event 0x%04X, hdr_len %d, wrqu_off %d, event_len %d\n", dev->name, cmd, hdr_len, wrqu_off, event_len);
1da177e4
LT		 1238#endif /* WE_EVENT_DEBUG */
1239
1240 /* Create temporary buffer to hold the event */
1241 event = kmalloc(event_len, GFP_ATOMIC);
1242 if(event == NULL)
1243 return;
1244
1245 /* Fill event */
1246 event->len = event_len;
1247 event->cmd = cmd;
6582c164 1248 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
1da177e4
LT		 1249 if(extra != NULL)
1250 memcpy(((char *) event) + hdr_len, extra, extra_len);
1251
1252#ifdef WE_EVENT_NETLINK
1253 /* rtnetlink event channel */
1254 rtmsg_iwinfo(dev, (char *) event, event_len);
1255#endif /* WE_EVENT_NETLINK */
1256
1257 /* Cleanup */
1258 kfree(event);
1259
1260 return; /* Always success, I guess ;-) */
1261}
1262
1263/********************** ENHANCED IWSPY SUPPORT **********************/
1264/*
1265 * In the old days, the driver was handling spy support all by itself.
1266 * Now, the driver can delegate this task to Wireless Extensions.
1267 * It needs to use those standard spy iw_handler in struct iw_handler_def,
1268 * push data to us via wireless_spy_update() and include struct iw_spy_data
6582c164 1269 * in its private part (and export it in net_device->wireless_data->spy_data).
1da177e4
LT		 1270 * One of the main advantage of centralising spy support here is that
1271 * it becomes much easier to improve and extend it without having to touch
1272 * the drivers. One example is the addition of the Spy-Threshold events.
1273 */
1274
1275/* ---------------------------------------------------------------- */
1276/*
1277 * Return the pointer to the spy data in the driver.
1278 * Because this is called on the Rx path via wireless_spy_update(),
1279 * we want it to be efficient...
1280 */
1281static inline struct iw_spy_data * get_spydata(struct net_device *dev)
1282{
1283 /* This is the new way */
1284 if(dev->wireless_data)
1285 return(dev->wireless_data->spy_data);
6582c164 1286 return NULL;
1da177e4
LT		 1287}
1288
1289/*------------------------------------------------------------------*/
1290/*
1291 * Standard Wireless Handler : set Spy List
1292 */
1293int iw_handler_set_spy(struct net_device * dev,
1294 struct iw_request_info * info,
1295 union iwreq_data * wrqu,
1296 char * extra)
1297{
1298 struct iw_spy_data * spydata = get_spydata(dev);
1299 struct sockaddr * address = (struct sockaddr *) extra;
1300
1da177e4
LT		 1301 /* Make sure driver is not buggy or using the old API */
1302 if(!spydata)
1303 return -EOPNOTSUPP;
1304
1305 /* Disable spy collection while we copy the addresses.
1306 * While we copy addresses, any call to wireless_spy_update()
1307 * will NOP. This is OK, as anyway the addresses are changing. */
1308 spydata->spy_number = 0;
1309
1310 /* We want to operate without locking, because wireless_spy_update()
1311 * most likely will happen in the interrupt handler, and therefore
1312 * have its own locking constraints and needs performance.
1313 * The rtnl_lock() make sure we don't race with the other iw_handlers.
1314 * This make sure wireless_spy_update() "see" that the spy list
1315 * is temporarily disabled. */
1316 wmb();
1317
1318 /* Are there are addresses to copy? */
1319 if(wrqu->data.length > 0) {
1320 int i;
1321
1322 /* Copy addresses */
1323 for(i = 0; i < wrqu->data.length; i++)
1324 memcpy(spydata->spy_address[i], address[i].sa_data,
1325 ETH_ALEN);
1326 /* Reset stats */
1327 memset(spydata->spy_stat, 0,
1328 sizeof(struct iw_quality) * IW_MAX_SPY);
1329
1330#ifdef WE_SPY_DEBUG
6582c164 1331 printk(KERN_DEBUG "iw_handler_set_spy() : wireless_data %p, spydata %p, num %d\n", dev->wireless_data, spydata, wrqu->data.length);
1da177e4
LT		 1332 for (i = 0; i < wrqu->data.length; i++)
1333 printk(KERN_DEBUG
1334 "%02X:%02X:%02X:%02X:%02X:%02X \n",
1335 spydata->spy_address[i][0],
1336 spydata->spy_address[i][1],
1337 spydata->spy_address[i][2],
1338 spydata->spy_address[i][3],
1339 spydata->spy_address[i][4],
1340 spydata->spy_address[i][5]);
1341#endif /* WE_SPY_DEBUG */
1342 }
1343
1344 /* Make sure above is updated before re-enabling */
1345 wmb();
1346
1347 /* Enable addresses */
1348 spydata->spy_number = wrqu->data.length;
1349
1350 return 0;
1351}
1352
1353/*------------------------------------------------------------------*/
1354/*
1355 * Standard Wireless Handler : get Spy List
1356 */
1357int iw_handler_get_spy(struct net_device * dev,
1358 struct iw_request_info * info,
1359 union iwreq_data * wrqu,
1360 char * extra)
1361{
1362 struct iw_spy_data * spydata = get_spydata(dev);
1363 struct sockaddr * address = (struct sockaddr *) extra;
1364 int i;
1365
1366 /* Make sure driver is not buggy or using the old API */
1367 if(!spydata)
1368 return -EOPNOTSUPP;
1369
1370 wrqu->data.length = spydata->spy_number;
1371
1372 /* Copy addresses. */
1373 for(i = 0; i < spydata->spy_number; i++) {
1374 memcpy(address[i].sa_data, spydata->spy_address[i], ETH_ALEN);
1375 address[i].sa_family = AF_UNIX;
1376 }
1377 /* Copy stats to the user buffer (just after). */
1378 if(spydata->spy_number > 0)
1379 memcpy(extra + (sizeof(struct sockaddr) *spydata->spy_number),
1380 spydata->spy_stat,
1381 sizeof(struct iw_quality) * spydata->spy_number);
1382 /* Reset updated flags. */
1383 for(i = 0; i < spydata->spy_number; i++)
6582c164 1384 spydata->spy_stat[i].updated &= ~IW_QUAL_ALL_UPDATED;
1da177e4
LT		 1385 return 0;
1386}
1387
1388/*------------------------------------------------------------------*/
1389/*
1390 * Standard Wireless Handler : set spy threshold
1391 */
1392int iw_handler_set_thrspy(struct net_device * dev,
1393 struct iw_request_info *info,
1394 union iwreq_data * wrqu,
1395 char * extra)
1396{
1397 struct iw_spy_data * spydata = get_spydata(dev);
1398 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
1399
1400 /* Make sure driver is not buggy or using the old API */
1401 if(!spydata)
1402 return -EOPNOTSUPP;
1403
1404 /* Just do it */
1405 memcpy(&(spydata->spy_thr_low), &(threshold->low),
1406 2 * sizeof(struct iw_quality));
1407
1408 /* Clear flag */
1409 memset(spydata->spy_thr_under, '\0', sizeof(spydata->spy_thr_under));
1410
1411#ifdef WE_SPY_DEBUG
1412 printk(KERN_DEBUG "iw_handler_set_thrspy() : low %d ; high %d\n", spydata->spy_thr_low.level, spydata->spy_thr_high.level);
1413#endif /* WE_SPY_DEBUG */
1414
1415 return 0;
1416}
1417
1418/*------------------------------------------------------------------*/
1419/*
1420 * Standard Wireless Handler : get spy threshold
1421 */
1422int iw_handler_get_thrspy(struct net_device * dev,
1423 struct iw_request_info *info,
1424 union iwreq_data * wrqu,
1425 char * extra)
1426{
1427 struct iw_spy_data * spydata = get_spydata(dev);
1428 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
1429
1430 /* Make sure driver is not buggy or using the old API */
1431 if(!spydata)
1432 return -EOPNOTSUPP;
1433
1434 /* Just do it */
1435 memcpy(&(threshold->low), &(spydata->spy_thr_low),
1436 2 * sizeof(struct iw_quality));
1437
1438 return 0;
1439}
1440
1441/*------------------------------------------------------------------*/
1442/*
1443 * Prepare and send a Spy Threshold event
1444 */
1445static void iw_send_thrspy_event(struct net_device * dev,
1446 struct iw_spy_data * spydata,
1447 unsigned char * address,
1448 struct iw_quality * wstats)
1449{
1450 union iwreq_data wrqu;
1451 struct iw_thrspy threshold;
1452
1453 /* Init */
1454 wrqu.data.length = 1;
1455 wrqu.data.flags = 0;
1456 /* Copy address */
1457 memcpy(threshold.addr.sa_data, address, ETH_ALEN);
1458 threshold.addr.sa_family = ARPHRD_ETHER;
1459 /* Copy stats */
1460 memcpy(&(threshold.qual), wstats, sizeof(struct iw_quality));
1461 /* Copy also thresholds */
1462 memcpy(&(threshold.low), &(spydata->spy_thr_low),
1463 2 * sizeof(struct iw_quality));
1464
1465#ifdef WE_SPY_DEBUG
1466 printk(KERN_DEBUG "iw_send_thrspy_event() : address %02X:%02X:%02X:%02X:%02X:%02X, level %d, up = %d\n",
1467 threshold.addr.sa_data[0],
1468 threshold.addr.sa_data[1],
1469 threshold.addr.sa_data[2],
1470 threshold.addr.sa_data[3],
1471 threshold.addr.sa_data[4],
1472 threshold.addr.sa_data[5], threshold.qual.level);
1473#endif /* WE_SPY_DEBUG */
1474
1475 /* Send event to user space */
1476 wireless_send_event(dev, SIOCGIWTHRSPY, &wrqu, (char *) &threshold);
1477}
1478
1479/* ---------------------------------------------------------------- */
1480/*
1481 * Call for the driver to update the spy data.
1482 * For now, the spy data is a simple array. As the size of the array is
1483 * small, this is good enough. If we wanted to support larger number of
1484 * spy addresses, we should use something more efficient...
1485 */
1486void wireless_spy_update(struct net_device * dev,
1487 unsigned char * address,
1488 struct iw_quality * wstats)
1489{
1490 struct iw_spy_data * spydata = get_spydata(dev);
1491 int i;
1492 int match = -1;
1493
1494 /* Make sure driver is not buggy or using the old API */
1495 if(!spydata)
1496 return;
1497
1498#ifdef WE_SPY_DEBUG
6582c164 1499 printk(KERN_DEBUG "wireless_spy_update() : wireless_data %p, spydata %p, address %02X:%02X:%02X:%02X:%02X:%02X\n", dev->wireless_data, spydata, address[0], address[1], address[2], address[3], address[4], address[5]);
1da177e4
LT		 1500#endif /* WE_SPY_DEBUG */
1501
1502 /* Update all records that match */
1503 for(i = 0; i < spydata->spy_number; i++)
1504 if(!memcmp(address, spydata->spy_address[i], ETH_ALEN)) {
1505 memcpy(&(spydata->spy_stat[i]), wstats,
1506 sizeof(struct iw_quality));
1507 match = i;
1508 }
1509
1510 /* Generate an event if we cross the spy threshold.
1511 * To avoid event storms, we have a simple hysteresis : we generate
1512 * event only when we go under the low threshold or above the
1513 * high threshold. */
1514 if(match >= 0) {
1515 if(spydata->spy_thr_under[match]) {
1516 if(wstats->level > spydata->spy_thr_high.level) {
1517 spydata->spy_thr_under[match] = 0;
1518 iw_send_thrspy_event(dev, spydata,
1519 address, wstats);
1520 }
1521 } else {
1522 if(wstats->level < spydata->spy_thr_low.level) {
1523 spydata->spy_thr_under[match] = 1;
1524 iw_send_thrspy_event(dev, spydata,
1525 address, wstats);
1526 }
1527 }
1528 }
1529}
1530
1531EXPORT_SYMBOL(iw_handler_get_spy);
1532EXPORT_SYMBOL(iw_handler_get_thrspy);
1533EXPORT_SYMBOL(iw_handler_set_spy);
1534EXPORT_SYMBOL(iw_handler_set_thrspy);
1535EXPORT_SYMBOL(wireless_send_event);
1536EXPORT_SYMBOL(wireless_spy_update);
Linux kernel - Deliverables
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