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include/linux: enclose idr.h in #ifndef
[linux-2.6/linux-mips.git] / net / core / wireless.c
blob271ddb35b0b273a005f5315968c1059006252f6b
1 /*
2 * This file implement the Wireless Extensions APIs.
3 *
4 * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
5 * Copyright (c) 1997-2005 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
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 */
107 static 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 },
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 },
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] = {
211 .header_type = IW_HEADER_TYPE_POINT,
212 .token_size = 1,
213 .min_tokens = 0,
214 .max_tokens = sizeof(struct iw_scan_req),
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 },
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 },
328 };
329 static 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 */
336 static 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 },
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 },
379 };
380 static 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 */
384 static 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 */
396 static 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 */
421 static 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 */
449 static 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
456 /* Old location, field to be removed in next WE */
457 if(dev->get_wireless_stats) {
458 static int printed_message;
459
460 if (!printed_message++)
461 printk(KERN_DEBUG "%s (WE) : Driver using old /proc/net/wireless support, please fix driver !\n",
462 dev->name);
463
464 return dev->get_wireless_stats(dev);
465 }
466
467 /* Not found */
468 return (struct iw_statistics *) NULL;
469 }
470
471 /* ---------------------------------------------------------------- */
472 /*
473 * Call the commit handler in the driver
474 * (if exist and if conditions are right)
475 *
476 * Note : our current commit strategy is currently pretty dumb,
477 * but we will be able to improve on that...
478 * The goal is to try to agreagate as many changes as possible
479 * before doing the commit. Drivers that will define a commit handler
480 * are usually those that need a reset after changing parameters, so
481 * we want to minimise the number of reset.
482 * A cool idea is to use a timer : at each "set" command, we re-set the
483 * timer, when the timer eventually fires, we call the driver.
484 * Hopefully, more on that later.
485 *
486 * Also, I'm waiting to see how many people will complain about the
487 * netif_running(dev) test. I'm open on that one...
488 * Hopefully, the driver will remember to do a commit in "open()" ;-)
489 */
490 static inline int call_commit_handler(struct net_device * dev)
491 {
492 if((netif_running(dev)) &&
493 (dev->wireless_handlers->standard[0] != NULL)) {
494 /* Call the commit handler on the driver */
495 return dev->wireless_handlers->standard[0](dev, NULL,
496 NULL, NULL);
497 } else
498 return 0; /* Command completed successfully */
499 }
500
501 /* ---------------------------------------------------------------- */
502 /*
503 * Calculate size of private arguments
504 */
505 static inline int get_priv_size(__u16 args)
506 {
507 int num = args & IW_PRIV_SIZE_MASK;
508 int type = (args & IW_PRIV_TYPE_MASK) >> 12;
509
510 return num * iw_priv_type_size[type];
511 }
512
513 /* ---------------------------------------------------------------- */
514 /*
515 * Re-calculate the size of private arguments
516 */
517 static inline int adjust_priv_size(__u16 args,
518 union iwreq_data * wrqu)
519 {
520 int num = wrqu->data.length;
521 int max = args & IW_PRIV_SIZE_MASK;
522 int type = (args & IW_PRIV_TYPE_MASK) >> 12;
523
524 /* Make sure the driver doesn't goof up */
525 if (max < num)
526 num = max;
527
528 return num * iw_priv_type_size[type];
529 }
530
531
532 /******************** /proc/net/wireless SUPPORT ********************/
533 /*
534 * The /proc/net/wireless file is a human readable user-space interface
535 * exporting various wireless specific statistics from the wireless devices.
536 * This is the most popular part of the Wireless Extensions ;-)
537 *
538 * This interface is a pure clone of /proc/net/dev (in net/core/dev.c).
539 * The content of the file is basically the content of "struct iw_statistics".
540 */
541
542 #ifdef CONFIG_PROC_FS
543
544 /* ---------------------------------------------------------------- */
545 /*
546 * Print one entry (line) of /proc/net/wireless
547 */
548 static __inline__ void wireless_seq_printf_stats(struct seq_file *seq,
549 struct net_device *dev)
550 {
551 /* Get stats from the driver */
552 struct iw_statistics *stats = get_wireless_stats(dev);
553
554 if (stats) {
555 seq_printf(seq, "%6s: %04x %3d%c %3d%c %3d%c %6d %6d %6d "
556 "%6d %6d %6d\n",
557 dev->name, stats->status, stats->qual.qual,
558 stats->qual.updated & IW_QUAL_QUAL_UPDATED
559 ? '.' : ' ',
560 ((__s32) stats->qual.level) -
561 ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
562 stats->qual.updated & IW_QUAL_LEVEL_UPDATED
563 ? '.' : ' ',
564 ((__s32) stats->qual.noise) -
565 ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
566 stats->qual.updated & IW_QUAL_NOISE_UPDATED
567 ? '.' : ' ',
568 stats->discard.nwid, stats->discard.code,
569 stats->discard.fragment, stats->discard.retries,
570 stats->discard.misc, stats->miss.beacon);
571 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
572 }
573 }
574
575 /* ---------------------------------------------------------------- */
576 /*
577 * Print info for /proc/net/wireless (print all entries)
578 */
579 static int wireless_seq_show(struct seq_file *seq, void *v)
580 {
581 if (v == SEQ_START_TOKEN)
582 seq_printf(seq, "Inter-| sta-| Quality | Discarded "
583 "packets | Missed | WE\n"
584 " face | tus | link level noise | nwid "
585 "crypt frag retry misc | beacon | %d\n",
586 WIRELESS_EXT);
587 else
588 wireless_seq_printf_stats(seq, v);
589 return 0;
590 }
591
592 static struct seq_operations wireless_seq_ops = {
593 .start = dev_seq_start,
594 .next = dev_seq_next,
595 .stop = dev_seq_stop,
596 .show = wireless_seq_show,
597 };
598
599 static int wireless_seq_open(struct inode *inode, struct file *file)
600 {
601 return seq_open(file, &wireless_seq_ops);
602 }
603
604 static struct file_operations wireless_seq_fops = {
605 .owner = THIS_MODULE,
606 .open = wireless_seq_open,
607 .read = seq_read,
608 .llseek = seq_lseek,
609 .release = seq_release,
610 };
611
612 int __init wireless_proc_init(void)
613 {
614 /* Create /proc/net/wireless entry */
615 if (!proc_net_fops_create("wireless", S_IRUGO, &wireless_seq_fops))
616 return -ENOMEM;
617
618 return 0;
619 }
620 #endif /* CONFIG_PROC_FS */
621
622 /************************** IOCTL SUPPORT **************************/
623 /*
624 * The original user space API to configure all those Wireless Extensions
625 * is through IOCTLs.
626 * In there, we check if we need to call the new driver API (iw_handler)
627 * or just call the driver ioctl handler.
628 */
629
630 /* ---------------------------------------------------------------- */
631 /*
632 * Allow programatic access to /proc/net/wireless even if /proc
633 * doesn't exist... Also more efficient...
634 */
635 static inline int dev_iwstats(struct net_device *dev, struct ifreq *ifr)
636 {
637 /* Get stats from the driver */
638 struct iw_statistics *stats;
639
640 stats = get_wireless_stats(dev);
641 if (stats != (struct iw_statistics *) NULL) {
642 struct iwreq * wrq = (struct iwreq *)ifr;
643
644 /* Copy statistics to the user buffer */
645 if(copy_to_user(wrq->u.data.pointer, stats,
646 sizeof(struct iw_statistics)))
647 return -EFAULT;
648
649 /* Check if we need to clear the updated flag */
650 if(wrq->u.data.flags != 0)
651 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
652 return 0;
653 } else
654 return -EOPNOTSUPP;
655 }
656
657 /* ---------------------------------------------------------------- */
658 /*
659 * Export the driver private handler definition
660 * They will be picked up by tools like iwpriv...
661 */
662 static inline int ioctl_export_private(struct net_device * dev,
663 struct ifreq * ifr)
664 {
665 struct iwreq * iwr = (struct iwreq *) ifr;
666
667 /* Check if the driver has something to export */
668 if((dev->wireless_handlers->num_private_args == 0) ||
669 (dev->wireless_handlers->private_args == NULL))
670 return -EOPNOTSUPP;
671
672 /* Check NULL pointer */
673 if(iwr->u.data.pointer == NULL)
674 return -EFAULT;
675
676 /* Check if there is enough buffer up there */
677 if(iwr->u.data.length < dev->wireless_handlers->num_private_args) {
678 /* User space can't know in advance how large the buffer
679 * needs to be. Give it a hint, so that we can support
680 * any size buffer we want somewhat efficiently... */
681 iwr->u.data.length = dev->wireless_handlers->num_private_args;
682 return -E2BIG;
683 }
684
685 /* Set the number of available ioctls. */
686 iwr->u.data.length = dev->wireless_handlers->num_private_args;
687
688 /* Copy structure to the user buffer. */
689 if (copy_to_user(iwr->u.data.pointer,
690 dev->wireless_handlers->private_args,
691 sizeof(struct iw_priv_args) * iwr->u.data.length))
692 return -EFAULT;
693
694 return 0;
695 }
696
697 /* ---------------------------------------------------------------- */
698 /*
699 * Wrapper to call a standard Wireless Extension handler.
700 * We do various checks and also take care of moving data between
701 * user space and kernel space.
702 */
703 static inline int ioctl_standard_call(struct net_device * dev,
704 struct ifreq * ifr,
705 unsigned int cmd,
706 iw_handler handler)
707 {
708 struct iwreq * iwr = (struct iwreq *) ifr;
709 const struct iw_ioctl_description * descr;
710 struct iw_request_info info;
711 int ret = -EINVAL;
712
713 /* Get the description of the IOCTL */
714 if((cmd - SIOCIWFIRST) >= standard_ioctl_num)
715 return -EOPNOTSUPP;
716 descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
717
718 #ifdef WE_IOCTL_DEBUG
719 printk(KERN_DEBUG "%s (WE) : Found standard handler for 0x%04X\n",
720 ifr->ifr_name, cmd);
721 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);
722 #endif /* WE_IOCTL_DEBUG */
723
724 /* Prepare the call */
725 info.cmd = cmd;
726 info.flags = 0;
727
728 /* Check if we have a pointer to user space data or not */
729 if(descr->header_type != IW_HEADER_TYPE_POINT) {
730
731 /* No extra arguments. Trivial to handle */
732 ret = handler(dev, &info, &(iwr->u), NULL);
733
734 #ifdef WE_SET_EVENT
735 /* Generate an event to notify listeners of the change */
736 if((descr->flags & IW_DESCR_FLAG_EVENT) &&
737 ((ret == 0) || (ret == -EIWCOMMIT)))
738 wireless_send_event(dev, cmd, &(iwr->u), NULL);
739 #endif /* WE_SET_EVENT */
740 } else {
741 char * extra;
742 int extra_size;
743 int user_length = 0;
744 int err;
745
746 /* Calculate space needed by arguments. Always allocate
747 * for max space. Easier, and won't last long... */
748 extra_size = descr->max_tokens * descr->token_size;
749
750 /* Check what user space is giving us */
751 if(IW_IS_SET(cmd)) {
752 /* Check NULL pointer */
753 if((iwr->u.data.pointer == NULL) &&
754 (iwr->u.data.length != 0))
755 return -EFAULT;
756 /* Check if number of token fits within bounds */
757 if(iwr->u.data.length > descr->max_tokens)
758 return -E2BIG;
759 if(iwr->u.data.length < descr->min_tokens)
760 return -EINVAL;
761 } else {
762 /* Check NULL pointer */
763 if(iwr->u.data.pointer == NULL)
764 return -EFAULT;
765 /* Save user space buffer size for checking */
766 user_length = iwr->u.data.length;
767
768 /* Don't check if user_length > max to allow forward
769 * compatibility. The test user_length < min is
770 * implied by the test at the end. */
771
772 /* Support for very large requests */
773 if((descr->flags & IW_DESCR_FLAG_NOMAX) &&
774 (user_length > descr->max_tokens)) {
775 /* Allow userspace to GET more than max so
776 * we can support any size GET requests.
777 * There is still a limit : -ENOMEM. */
778 extra_size = user_length * descr->token_size;
779 /* Note : user_length is originally a __u16,
780 * and token_size is controlled by us,
781 * so extra_size won't get negative and
782 * won't overflow... */
783 }
784 }
785
786 #ifdef WE_IOCTL_DEBUG
787 printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n",
788 dev->name, extra_size);
789 #endif /* WE_IOCTL_DEBUG */
790
791 /* Create the kernel buffer */
792 extra = kmalloc(extra_size, GFP_KERNEL);
793 if (extra == NULL) {
794 return -ENOMEM;
795 }
796
797 /* If it is a SET, get all the extra data in here */
798 if(IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
799 err = copy_from_user(extra, iwr->u.data.pointer,
800 iwr->u.data.length *
801 descr->token_size);
802 if (err) {
803 kfree(extra);
804 return -EFAULT;
805 }
806 #ifdef WE_IOCTL_DEBUG
807 printk(KERN_DEBUG "%s (WE) : Got %d bytes\n",
808 dev->name,
809 iwr->u.data.length * descr->token_size);
810 #endif /* WE_IOCTL_DEBUG */
811 }
812
813 /* Call the handler */
814 ret = handler(dev, &info, &(iwr->u), extra);
815
816 /* If we have something to return to the user */
817 if (!ret && IW_IS_GET(cmd)) {
818 /* Check if there is enough buffer up there */
819 if(user_length < iwr->u.data.length) {
820 kfree(extra);
821 return -E2BIG;
822 }
823
824 err = copy_to_user(iwr->u.data.pointer, extra,
825 iwr->u.data.length *
826 descr->token_size);
827 if (err)
828 ret = -EFAULT;
829 #ifdef WE_IOCTL_DEBUG
830 printk(KERN_DEBUG "%s (WE) : Wrote %d bytes\n",
831 dev->name,
832 iwr->u.data.length * descr->token_size);
833 #endif /* WE_IOCTL_DEBUG */
834 }
835
836 #ifdef WE_SET_EVENT
837 /* Generate an event to notify listeners of the change */
838 if((descr->flags & IW_DESCR_FLAG_EVENT) &&
839 ((ret == 0) || (ret == -EIWCOMMIT))) {
840 if(descr->flags & IW_DESCR_FLAG_RESTRICT)
841 /* If the event is restricted, don't
842 * export the payload */
843 wireless_send_event(dev, cmd, &(iwr->u), NULL);
844 else
845 wireless_send_event(dev, cmd, &(iwr->u),
846 extra);
847 }
848 #endif /* WE_SET_EVENT */
849
850 /* Cleanup - I told you it wasn't that long ;-) */
851 kfree(extra);
852 }
853
854 /* Call commit handler if needed and defined */
855 if(ret == -EIWCOMMIT)
856 ret = call_commit_handler(dev);
857
858 /* Here, we will generate the appropriate event if needed */
859
860 return ret;
861 }
862
863 /* ---------------------------------------------------------------- */
864 /*
865 * Wrapper to call a private Wireless Extension handler.
866 * We do various checks and also take care of moving data between
867 * user space and kernel space.
868 * It's not as nice and slimline as the standard wrapper. The cause
869 * is struct iw_priv_args, which was not really designed for the
870 * job we are going here.
871 *
872 * IMPORTANT : This function prevent to set and get data on the same
873 * IOCTL and enforce the SET/GET convention. Not doing it would be
874 * far too hairy...
875 * If you need to set and get data at the same time, please don't use
876 * a iw_handler but process it in your ioctl handler (i.e. use the
877 * old driver API).
878 */
879 static inline int ioctl_private_call(struct net_device * dev,
880 struct ifreq * ifr,
881 unsigned int cmd,
882 iw_handler handler)
883 {
884 struct iwreq * iwr = (struct iwreq *) ifr;
885 const struct iw_priv_args * descr = NULL;
886 struct iw_request_info info;
887 int extra_size = 0;
888 int i;
889 int ret = -EINVAL;
890
891 /* Get the description of the IOCTL */
892 for(i = 0; i < dev->wireless_handlers->num_private_args; i++)
893 if(cmd == dev->wireless_handlers->private_args[i].cmd) {
894 descr = &(dev->wireless_handlers->private_args[i]);
895 break;
896 }
897
898 #ifdef WE_IOCTL_DEBUG
899 printk(KERN_DEBUG "%s (WE) : Found private handler for 0x%04X\n",
900 ifr->ifr_name, cmd);
901 if(descr) {
902 printk(KERN_DEBUG "%s (WE) : Name %s, set %X, get %X\n",
903 dev->name, descr->name,
904 descr->set_args, descr->get_args);
905 }
906 #endif /* WE_IOCTL_DEBUG */
907
908 /* Compute the size of the set/get arguments */
909 if(descr != NULL) {
910 if(IW_IS_SET(cmd)) {
911 int offset = 0; /* For sub-ioctls */
912 /* Check for sub-ioctl handler */
913 if(descr->name[0] == '\0')
914 /* Reserve one int for sub-ioctl index */
915 offset = sizeof(__u32);
916
917 /* Size of set arguments */
918 extra_size = get_priv_size(descr->set_args);
919
920 /* Does it fits in iwr ? */
921 if((descr->set_args & IW_PRIV_SIZE_FIXED) &&
922 ((extra_size + offset) <= IFNAMSIZ))
923 extra_size = 0;
924 } else {
925 /* Size of get arguments */
926 extra_size = get_priv_size(descr->get_args);
927
928 /* Does it fits in iwr ? */
929 if((descr->get_args & IW_PRIV_SIZE_FIXED) &&
930 (extra_size <= IFNAMSIZ))
931 extra_size = 0;
932 }
933 }
934
935 /* Prepare the call */
936 info.cmd = cmd;
937 info.flags = 0;
938
939 /* Check if we have a pointer to user space data or not. */
940 if(extra_size == 0) {
941 /* No extra arguments. Trivial to handle */
942 ret = handler(dev, &info, &(iwr->u), (char *) &(iwr->u));
943 } else {
944 char * extra;
945 int err;
946
947 /* Check what user space is giving us */
948 if(IW_IS_SET(cmd)) {
949 /* Check NULL pointer */
950 if((iwr->u.data.pointer == NULL) &&
951 (iwr->u.data.length != 0))
952 return -EFAULT;
953
954 /* Does it fits within bounds ? */
955 if(iwr->u.data.length > (descr->set_args &
956 IW_PRIV_SIZE_MASK))
957 return -E2BIG;
958 } else {
959 /* Check NULL pointer */
960 if(iwr->u.data.pointer == NULL)
961 return -EFAULT;
962 }
963
964 #ifdef WE_IOCTL_DEBUG
965 printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n",
966 dev->name, extra_size);
967 #endif /* WE_IOCTL_DEBUG */
968
969 /* Always allocate for max space. Easier, and won't last
970 * long... */
971 extra = kmalloc(extra_size, GFP_KERNEL);
972 if (extra == NULL) {
973 return -ENOMEM;
974 }
975
976 /* If it is a SET, get all the extra data in here */
977 if(IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
978 err = copy_from_user(extra, iwr->u.data.pointer,
979 extra_size);
980 if (err) {
981 kfree(extra);
982 return -EFAULT;
983 }
984 #ifdef WE_IOCTL_DEBUG
985 printk(KERN_DEBUG "%s (WE) : Got %d elem\n",
986 dev->name, iwr->u.data.length);
987 #endif /* WE_IOCTL_DEBUG */
988 }
989
990 /* Call the handler */
991 ret = handler(dev, &info, &(iwr->u), extra);
992
993 /* If we have something to return to the user */
994 if (!ret && IW_IS_GET(cmd)) {
995
996 /* Adjust for the actual length if it's variable,
997 * avoid leaking kernel bits outside. */
998 if (!(descr->get_args & IW_PRIV_SIZE_FIXED)) {
999 extra_size = adjust_priv_size(descr->get_args,
1000 &(iwr->u));
1001 }
1002
1003 err = copy_to_user(iwr->u.data.pointer, extra,
1004 extra_size);
1005 if (err)
1006 ret = -EFAULT;
1007 #ifdef WE_IOCTL_DEBUG
1008 printk(KERN_DEBUG "%s (WE) : Wrote %d elem\n",
1009 dev->name, iwr->u.data.length);
1010 #endif /* WE_IOCTL_DEBUG */
1011 }
1012
1013 /* Cleanup - I told you it wasn't that long ;-) */
1014 kfree(extra);
1015 }
1016
1017
1018 /* Call commit handler if needed and defined */
1019 if(ret == -EIWCOMMIT)
1020 ret = call_commit_handler(dev);
1021
1022 return ret;
1023 }
1024
1025 /* ---------------------------------------------------------------- */
1026 /*
1027 * Main IOCTl dispatcher. Called from the main networking code
1028 * (dev_ioctl() in net/core/dev.c).
1029 * Check the type of IOCTL and call the appropriate wrapper...
1030 */
1031 int wireless_process_ioctl(struct ifreq *ifr, unsigned int cmd)
1032 {
1033 struct net_device *dev;
1034 iw_handler handler;
1035
1036 /* Permissions are already checked in dev_ioctl() before calling us.
1037 * The copy_to/from_user() of ifr is also dealt with in there */
1038
1039 /* Make sure the device exist */
1040 if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL)
1041 return -ENODEV;
1042
1043 /* A bunch of special cases, then the generic case...
1044 * Note that 'cmd' is already filtered in dev_ioctl() with
1045 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
1046 switch(cmd)
1047 {
1048 case SIOCGIWSTATS:
1049 /* Get Wireless Stats */
1050 return dev_iwstats(dev, ifr);
1051
1052 case SIOCGIWPRIV:
1053 /* Check if we have some wireless handlers defined */
1054 if(dev->wireless_handlers != NULL) {
1055 /* We export to user space the definition of
1056 * the private handler ourselves */
1057 return ioctl_export_private(dev, ifr);
1058 }
1059 // ## Fall-through for old API ##
1060 default:
1061 /* Generic IOCTL */
1062 /* Basic check */
1063 if (!netif_device_present(dev))
1064 return -ENODEV;
1065 /* New driver API : try to find the handler */
1066 handler = get_handler(dev, cmd);
1067 if(handler != NULL) {
1068 /* Standard and private are not the same */
1069 if(cmd < SIOCIWFIRSTPRIV)
1070 return ioctl_standard_call(dev,
1071 ifr,
1072 cmd,
1073 handler);
1074 else
1075 return ioctl_private_call(dev,
1076 ifr,
1077 cmd,
1078 handler);
1079 }
1080 /* Old driver API : call driver ioctl handler */
1081 if (dev->do_ioctl) {
1082 return dev->do_ioctl(dev, ifr, cmd);
1083 }
1084 return -EOPNOTSUPP;
1085 }
1086 /* Not reached */
1087 return -EINVAL;
1088 }
1089
1090 /************************* EVENT PROCESSING *************************/
1091 /*
1092 * Process events generated by the wireless layer or the driver.
1093 * Most often, the event will be propagated through rtnetlink
1094 */
1095
1096 #ifdef WE_EVENT_NETLINK
1097 /* "rtnl" is defined in net/core/rtnetlink.c, but we need it here.
1098 * It is declared in <linux/rtnetlink.h> */
1099
1100 /* ---------------------------------------------------------------- */
1101 /*
1102 * Fill a rtnetlink message with our event data.
1103 * Note that we propage only the specified event and don't dump the
1104 * current wireless config. Dumping the wireless config is far too
1105 * expensive (for each parameter, the driver need to query the hardware).
1106 */
1107 static inline int rtnetlink_fill_iwinfo(struct sk_buff * skb,
1108 struct net_device * dev,
1109 int type,
1110 char * event,
1111 int event_len)
1112 {
1113 struct ifinfomsg *r;
1114 struct nlmsghdr *nlh;
1115 unsigned char *b = skb->tail;
1116
1117 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(*r));
1118 r = NLMSG_DATA(nlh);
1119 r->ifi_family = AF_UNSPEC;
1120 r->__ifi_pad = 0;
1121 r->ifi_type = dev->type;
1122 r->ifi_index = dev->ifindex;
1123 r->ifi_flags = dev->flags;
1124 r->ifi_change = 0; /* Wireless changes don't affect those flags */
1125
1126 /* Add the wireless events in the netlink packet */
1127 RTA_PUT(skb, IFLA_WIRELESS,
1128 event_len, event);
1129
1130 nlh->nlmsg_len = skb->tail - b;
1131 return skb->len;
1132
1133 nlmsg_failure:
1134 rtattr_failure:
1135 skb_trim(skb, b - skb->data);
1136 return -1;
1137 }
1138
1139 /* ---------------------------------------------------------------- */
1140 /*
1141 * Create and broadcast and send it on the standard rtnetlink socket
1142 * This is a pure clone rtmsg_ifinfo() in net/core/rtnetlink.c
1143 * Andrzej Krzysztofowicz mandated that I used a IFLA_XXX field
1144 * within a RTM_NEWLINK event.
1145 */
1146 static inline void rtmsg_iwinfo(struct net_device * dev,
1147 char * event,
1148 int event_len)
1149 {
1150 struct sk_buff *skb;
1151 int size = NLMSG_GOODSIZE;
1152
1153 skb = alloc_skb(size, GFP_ATOMIC);
1154 if (!skb)
1155 return;
1156
1157 if (rtnetlink_fill_iwinfo(skb, dev, RTM_NEWLINK,
1158 event, event_len) < 0) {
1159 kfree_skb(skb);
1160 return;
1161 }
1162 NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
1163 netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_ATOMIC);
1164 }
1165 #endif /* WE_EVENT_NETLINK */
1166
1167 /* ---------------------------------------------------------------- */
1168 /*
1169 * Main event dispatcher. Called from other parts and drivers.
1170 * Send the event on the appropriate channels.
1171 * May be called from interrupt context.
1172 */
1173 void wireless_send_event(struct net_device * dev,
1174 unsigned int cmd,
1175 union iwreq_data * wrqu,
1176 char * extra)
1177 {
1178 const struct iw_ioctl_description * descr = NULL;
1179 int extra_len = 0;
1180 struct iw_event *event; /* Mallocated whole event */
1181 int event_len; /* Its size */
1182 int hdr_len; /* Size of the event header */
1183 int wrqu_off = 0; /* Offset in wrqu */
1184 /* Don't "optimise" the following variable, it will crash */
1185 unsigned cmd_index; /* *MUST* be unsigned */
1186
1187 /* Get the description of the Event */
1188 if(cmd <= SIOCIWLAST) {
1189 cmd_index = cmd - SIOCIWFIRST;
1190 if(cmd_index < standard_ioctl_num)
1191 descr = &(standard_ioctl[cmd_index]);
1192 } else {
1193 cmd_index = cmd - IWEVFIRST;
1194 if(cmd_index < standard_event_num)
1195 descr = &(standard_event[cmd_index]);
1196 }
1197 /* Don't accept unknown events */
1198 if(descr == NULL) {
1199 /* Note : we don't return an error to the driver, because
1200 * the driver would not know what to do about it. It can't
1201 * return an error to the user, because the event is not
1202 * initiated by a user request.
1203 * The best the driver could do is to log an error message.
1204 * We will do it ourselves instead...
1205 */
1206 printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
1207 dev->name, cmd);
1208 return;
1209 }
1210 #ifdef WE_EVENT_DEBUG
1211 printk(KERN_DEBUG "%s (WE) : Got event 0x%04X\n",
1212 dev->name, cmd);
1213 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);
1214 #endif /* WE_EVENT_DEBUG */
1215
1216 /* Check extra parameters and set extra_len */
1217 if(descr->header_type == IW_HEADER_TYPE_POINT) {
1218 /* Check if number of token fits within bounds */
1219 if(wrqu->data.length > descr->max_tokens) {
1220 printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length);
1221 return;
1222 }
1223 if(wrqu->data.length < descr->min_tokens) {
1224 printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, wrqu->data.length);
1225 return;
1226 }
1227 /* Calculate extra_len - extra is NULL for restricted events */
1228 if(extra != NULL)
1229 extra_len = wrqu->data.length * descr->token_size;
1230 /* Always at an offset in wrqu */
1231 wrqu_off = IW_EV_POINT_OFF;
1232 #ifdef WE_EVENT_DEBUG
1233 printk(KERN_DEBUG "%s (WE) : Event 0x%04X, tokens %d, extra_len %d\n", dev->name, cmd, wrqu->data.length, extra_len);
1234 #endif /* WE_EVENT_DEBUG */
1235 }
1236
1237 /* Total length of the event */
1238 hdr_len = event_type_size[descr->header_type];
1239 event_len = hdr_len + extra_len;
1240
1241 #ifdef WE_EVENT_DEBUG
1242 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);
1243 #endif /* WE_EVENT_DEBUG */
1244
1245 /* Create temporary buffer to hold the event */
1246 event = kmalloc(event_len, GFP_ATOMIC);
1247 if(event == NULL)
1248 return;
1249
1250 /* Fill event */
1251 event->len = event_len;
1252 event->cmd = cmd;
1253 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
1254 if(extra != NULL)
1255 memcpy(((char *) event) + hdr_len, extra, extra_len);
1256
1257 #ifdef WE_EVENT_NETLINK
1258 /* rtnetlink event channel */
1259 rtmsg_iwinfo(dev, (char *) event, event_len);
1260 #endif /* WE_EVENT_NETLINK */
1261
1262 /* Cleanup */
1263 kfree(event);
1264
1265 return; /* Always success, I guess ;-) */
1266 }
1267
1268 /********************** ENHANCED IWSPY SUPPORT **********************/
1269 /*
1270 * In the old days, the driver was handling spy support all by itself.
1271 * Now, the driver can delegate this task to Wireless Extensions.
1272 * It needs to use those standard spy iw_handler in struct iw_handler_def,
1273 * push data to us via wireless_spy_update() and include struct iw_spy_data
1274 * in its private part (and export it in net_device->wireless_data->spy_data).
1275 * One of the main advantage of centralising spy support here is that
1276 * it becomes much easier to improve and extend it without having to touch
1277 * the drivers. One example is the addition of the Spy-Threshold events.
1278 */
1279
1280 /* ---------------------------------------------------------------- */
1281 /*
1282 * Return the pointer to the spy data in the driver.
1283 * Because this is called on the Rx path via wireless_spy_update(),
1284 * we want it to be efficient...
1285 */
1286 static inline struct iw_spy_data * get_spydata(struct net_device *dev)
1287 {
1288 /* This is the new way */
1289 if(dev->wireless_data)
1290 return(dev->wireless_data->spy_data);
1291 return NULL;
1292 }
1293
1294 /*------------------------------------------------------------------*/
1295 /*
1296 * Standard Wireless Handler : set Spy List
1297 */
1298 int iw_handler_set_spy(struct net_device * dev,
1299 struct iw_request_info * info,
1300 union iwreq_data * wrqu,
1301 char * extra)
1302 {
1303 struct iw_spy_data * spydata = get_spydata(dev);
1304 struct sockaddr * address = (struct sockaddr *) extra;
1305
1306 /* Make sure driver is not buggy or using the old API */
1307 if(!spydata)
1308 return -EOPNOTSUPP;
1309
1310 /* Disable spy collection while we copy the addresses.
1311 * While we copy addresses, any call to wireless_spy_update()
1312 * will NOP. This is OK, as anyway the addresses are changing. */
1313 spydata->spy_number = 0;
1314
1315 /* We want to operate without locking, because wireless_spy_update()
1316 * most likely will happen in the interrupt handler, and therefore
1317 * have its own locking constraints and needs performance.
1318 * The rtnl_lock() make sure we don't race with the other iw_handlers.
1319 * This make sure wireless_spy_update() "see" that the spy list
1320 * is temporarily disabled. */
1321 wmb();
1322
1323 /* Are there are addresses to copy? */
1324 if(wrqu->data.length > 0) {
1325 int i;
1326
1327 /* Copy addresses */
1328 for(i = 0; i < wrqu->data.length; i++)
1329 memcpy(spydata->spy_address[i], address[i].sa_data,
1330 ETH_ALEN);
1331 /* Reset stats */
1332 memset(spydata->spy_stat, 0,
1333 sizeof(struct iw_quality) * IW_MAX_SPY);
1334
1335 #ifdef WE_SPY_DEBUG
1336 printk(KERN_DEBUG "iw_handler_set_spy() : wireless_data %p, spydata %p, num %d\n", dev->wireless_data, spydata, wrqu->data.length);
1337 for (i = 0; i < wrqu->data.length; i++)
1338 printk(KERN_DEBUG
1339 "%02X:%02X:%02X:%02X:%02X:%02X \n",
1340 spydata->spy_address[i][0],
1341 spydata->spy_address[i][1],
1342 spydata->spy_address[i][2],
1343 spydata->spy_address[i][3],
1344 spydata->spy_address[i][4],
1345 spydata->spy_address[i][5]);
1346 #endif /* WE_SPY_DEBUG */
1347 }
1348
1349 /* Make sure above is updated before re-enabling */
1350 wmb();
1351
1352 /* Enable addresses */
1353 spydata->spy_number = wrqu->data.length;
1354
1355 return 0;
1356 }
1357
1358 /*------------------------------------------------------------------*/
1359 /*
1360 * Standard Wireless Handler : get Spy List
1361 */
1362 int iw_handler_get_spy(struct net_device * dev,
1363 struct iw_request_info * info,
1364 union iwreq_data * wrqu,
1365 char * extra)
1366 {
1367 struct iw_spy_data * spydata = get_spydata(dev);
1368 struct sockaddr * address = (struct sockaddr *) extra;
1369 int i;
1370
1371 /* Make sure driver is not buggy or using the old API */
1372 if(!spydata)
1373 return -EOPNOTSUPP;
1374
1375 wrqu->data.length = spydata->spy_number;
1376
1377 /* Copy addresses. */
1378 for(i = 0; i < spydata->spy_number; i++) {
1379 memcpy(address[i].sa_data, spydata->spy_address[i], ETH_ALEN);
1380 address[i].sa_family = AF_UNIX;
1381 }
1382 /* Copy stats to the user buffer (just after). */
1383 if(spydata->spy_number > 0)
1384 memcpy(extra + (sizeof(struct sockaddr) *spydata->spy_number),
1385 spydata->spy_stat,
1386 sizeof(struct iw_quality) * spydata->spy_number);
1387 /* Reset updated flags. */
1388 for(i = 0; i < spydata->spy_number; i++)
1389 spydata->spy_stat[i].updated &= ~IW_QUAL_ALL_UPDATED;
1390 return 0;
1391 }
1392
1393 /*------------------------------------------------------------------*/
1394 /*
1395 * Standard Wireless Handler : set spy threshold
1396 */
1397 int iw_handler_set_thrspy(struct net_device * dev,
1398 struct iw_request_info *info,
1399 union iwreq_data * wrqu,
1400 char * extra)
1401 {
1402 struct iw_spy_data * spydata = get_spydata(dev);
1403 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
1404
1405 /* Make sure driver is not buggy or using the old API */
1406 if(!spydata)
1407 return -EOPNOTSUPP;
1408
1409 /* Just do it */
1410 memcpy(&(spydata->spy_thr_low), &(threshold->low),
1411 2 * sizeof(struct iw_quality));
1412
1413 /* Clear flag */
1414 memset(spydata->spy_thr_under, '\0', sizeof(spydata->spy_thr_under));
1415
1416 #ifdef WE_SPY_DEBUG
1417 printk(KERN_DEBUG "iw_handler_set_thrspy() : low %d ; high %d\n", spydata->spy_thr_low.level, spydata->spy_thr_high.level);
1418 #endif /* WE_SPY_DEBUG */
1419
1420 return 0;
1421 }
1422
1423 /*------------------------------------------------------------------*/
1424 /*
1425 * Standard Wireless Handler : get spy threshold
1426 */
1427 int iw_handler_get_thrspy(struct net_device * dev,
1428 struct iw_request_info *info,
1429 union iwreq_data * wrqu,
1430 char * extra)
1431 {
1432 struct iw_spy_data * spydata = get_spydata(dev);
1433 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
1434
1435 /* Make sure driver is not buggy or using the old API */
1436 if(!spydata)
1437 return -EOPNOTSUPP;
1438
1439 /* Just do it */
1440 memcpy(&(threshold->low), &(spydata->spy_thr_low),
1441 2 * sizeof(struct iw_quality));
1442
1443 return 0;
1444 }
1445
1446 /*------------------------------------------------------------------*/
1447 /*
1448 * Prepare and send a Spy Threshold event
1449 */
1450 static void iw_send_thrspy_event(struct net_device * dev,
1451 struct iw_spy_data * spydata,
1452 unsigned char * address,
1453 struct iw_quality * wstats)
1454 {
1455 union iwreq_data wrqu;
1456 struct iw_thrspy threshold;
1457
1458 /* Init */
1459 wrqu.data.length = 1;
1460 wrqu.data.flags = 0;
1461 /* Copy address */
1462 memcpy(threshold.addr.sa_data, address, ETH_ALEN);
1463 threshold.addr.sa_family = ARPHRD_ETHER;
1464 /* Copy stats */
1465 memcpy(&(threshold.qual), wstats, sizeof(struct iw_quality));
1466 /* Copy also thresholds */
1467 memcpy(&(threshold.low), &(spydata->spy_thr_low),
1468 2 * sizeof(struct iw_quality));
1469
1470 #ifdef WE_SPY_DEBUG
1471 printk(KERN_DEBUG "iw_send_thrspy_event() : address %02X:%02X:%02X:%02X:%02X:%02X, level %d, up = %d\n",
1472 threshold.addr.sa_data[0],
1473 threshold.addr.sa_data[1],
1474 threshold.addr.sa_data[2],
1475 threshold.addr.sa_data[3],
1476 threshold.addr.sa_data[4],
1477 threshold.addr.sa_data[5], threshold.qual.level);
1478 #endif /* WE_SPY_DEBUG */
1479
1480 /* Send event to user space */
1481 wireless_send_event(dev, SIOCGIWTHRSPY, &wrqu, (char *) &threshold);
1482 }
1483
1484 /* ---------------------------------------------------------------- */
1485 /*
1486 * Call for the driver to update the spy data.
1487 * For now, the spy data is a simple array. As the size of the array is
1488 * small, this is good enough. If we wanted to support larger number of
1489 * spy addresses, we should use something more efficient...
1490 */
1491 void wireless_spy_update(struct net_device * dev,
1492 unsigned char * address,
1493 struct iw_quality * wstats)
1494 {
1495 struct iw_spy_data * spydata = get_spydata(dev);
1496 int i;
1497 int match = -1;
1498
1499 /* Make sure driver is not buggy or using the old API */
1500 if(!spydata)
1501 return;
1502
1503 #ifdef WE_SPY_DEBUG
1504 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]);
1505 #endif /* WE_SPY_DEBUG */
1506
1507 /* Update all records that match */
1508 for(i = 0; i < spydata->spy_number; i++)
1509 if(!memcmp(address, spydata->spy_address[i], ETH_ALEN)) {
1510 memcpy(&(spydata->spy_stat[i]), wstats,
1511 sizeof(struct iw_quality));
1512 match = i;
1513 }
1514
1515 /* Generate an event if we cross the spy threshold.
1516 * To avoid event storms, we have a simple hysteresis : we generate
1517 * event only when we go under the low threshold or above the
1518 * high threshold. */
1519 if(match >= 0) {
1520 if(spydata->spy_thr_under[match]) {
1521 if(wstats->level > spydata->spy_thr_high.level) {
1522 spydata->spy_thr_under[match] = 0;
1523 iw_send_thrspy_event(dev, spydata,
1524 address, wstats);
1525 }
1526 } else {
1527 if(wstats->level < spydata->spy_thr_low.level) {
1528 spydata->spy_thr_under[match] = 1;
1529 iw_send_thrspy_event(dev, spydata,
1530 address, wstats);
1531 }
1532 }
1533 }
1534 }
1535
1536 EXPORT_SYMBOL(iw_handler_get_spy);
1537 EXPORT_SYMBOL(iw_handler_get_thrspy);
1538 EXPORT_SYMBOL(iw_handler_set_spy);
1539 EXPORT_SYMBOL(iw_handler_set_thrspy);
1540 EXPORT_SYMBOL(wireless_send_event);
1541 EXPORT_SYMBOL(wireless_spy_update);
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