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ALSA CVS update
[linux-2.6.git] / net / core / wireless.c
blob5caae2399f3a26891cb29cc0d58f34ee0e3b7a11
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
63 /***************************** INCLUDES *****************************/
64
65 #include <linux/config.h> /* Not needed ??? */
66 #include <linux/module.h>
67 #include <linux/types.h> /* off_t */
68 #include <linux/netdevice.h> /* struct ifreq, dev_get_by_name() */
69 #include <linux/proc_fs.h>
70 #include <linux/rtnetlink.h> /* rtnetlink stuff */
71 #include <linux/seq_file.h>
72 #include <linux/init.h> /* for __init */
73 #include <linux/if_arp.h> /* ARPHRD_ETHER */
74
75 #include <linux/wireless.h> /* Pretty obvious */
76 #include <net/iw_handler.h> /* New driver API */
77
78 #include <asm/uaccess.h> /* copy_to_user() */
79
80 /**************************** CONSTANTS ****************************/
81
82 /* Debugging stuff */
83 #undef WE_IOCTL_DEBUG /* Debug IOCTL API */
84 #undef WE_EVENT_DEBUG /* Debug Event dispatcher */
85 #undef WE_SPY_DEBUG /* Debug enhanced spy support */
86
87 /* Options */
88 #define WE_EVENT_NETLINK /* Propagate events using rtnetlink */
89 #define WE_SET_EVENT /* Generate an event on some set commands */
90
91 /************************* GLOBAL VARIABLES *************************/
92 /*
93 * You should not use global variables, because of re-entrancy.
94 * On our case, it's only const, so it's OK...
95 */
96 /*
97 * Meta-data about all the standard Wireless Extension request we
98 * know about.
99 */
100 static const struct iw_ioctl_description standard_ioctl[] = {
101 [SIOCSIWCOMMIT - SIOCIWFIRST] = {
102 .header_type = IW_HEADER_TYPE_NULL,
103 },
104 [SIOCGIWNAME - SIOCIWFIRST] = {
105 .header_type = IW_HEADER_TYPE_CHAR,
106 .flags = IW_DESCR_FLAG_DUMP,
107 },
108 [SIOCSIWNWID - SIOCIWFIRST] = {
109 .header_type = IW_HEADER_TYPE_PARAM,
110 .flags = IW_DESCR_FLAG_EVENT,
111 },
112 [SIOCGIWNWID - SIOCIWFIRST] = {
113 .header_type = IW_HEADER_TYPE_PARAM,
114 .flags = IW_DESCR_FLAG_DUMP,
115 },
116 [SIOCSIWFREQ - SIOCIWFIRST] = {
117 .header_type = IW_HEADER_TYPE_FREQ,
118 .flags = IW_DESCR_FLAG_EVENT,
119 },
120 [SIOCGIWFREQ - SIOCIWFIRST] = {
121 .header_type = IW_HEADER_TYPE_FREQ,
122 .flags = IW_DESCR_FLAG_DUMP,
123 },
124 [SIOCSIWMODE - SIOCIWFIRST] = {
125 .header_type = IW_HEADER_TYPE_UINT,
126 .flags = IW_DESCR_FLAG_EVENT,
127 },
128 [SIOCGIWMODE - SIOCIWFIRST] = {
129 .header_type = IW_HEADER_TYPE_UINT,
130 .flags = IW_DESCR_FLAG_DUMP,
131 },
132 [SIOCSIWSENS - SIOCIWFIRST] = {
133 .header_type = IW_HEADER_TYPE_PARAM,
134 },
135 [SIOCGIWSENS - SIOCIWFIRST] = {
136 .header_type = IW_HEADER_TYPE_PARAM,
137 },
138 [SIOCSIWRANGE - SIOCIWFIRST] = {
139 .header_type = IW_HEADER_TYPE_NULL,
140 },
141 [SIOCGIWRANGE - SIOCIWFIRST] = {
142 .header_type = IW_HEADER_TYPE_POINT,
143 .token_size = 1,
144 .max_tokens = sizeof(struct iw_range),
145 .flags = IW_DESCR_FLAG_DUMP,
146 },
147 [SIOCSIWPRIV - SIOCIWFIRST] = {
148 .header_type = IW_HEADER_TYPE_NULL,
149 },
150 [SIOCGIWPRIV - SIOCIWFIRST] = { /* (handled directly by us) */
151 .header_type = IW_HEADER_TYPE_NULL,
152 },
153 [SIOCSIWSTATS - SIOCIWFIRST] = {
154 .header_type = IW_HEADER_TYPE_NULL,
155 },
156 [SIOCGIWSTATS - SIOCIWFIRST] = { /* (handled directly by us) */
157 .header_type = IW_HEADER_TYPE_NULL,
158 .flags = IW_DESCR_FLAG_DUMP,
159 },
160 [SIOCSIWSPY - SIOCIWFIRST] = {
161 .header_type = IW_HEADER_TYPE_POINT,
162 .token_size = sizeof(struct sockaddr),
163 .max_tokens = IW_MAX_SPY,
164 },
165 [SIOCGIWSPY - SIOCIWFIRST] = {
166 .header_type = IW_HEADER_TYPE_POINT,
167 .token_size = sizeof(struct sockaddr) +
168 sizeof(struct iw_quality),
169 .max_tokens = IW_MAX_SPY,
170 },
171 [SIOCSIWTHRSPY - SIOCIWFIRST] = {
172 .header_type = IW_HEADER_TYPE_POINT,
173 .token_size = sizeof(struct iw_thrspy),
174 .min_tokens = 1,
175 .max_tokens = 1,
176 },
177 [SIOCGIWTHRSPY - SIOCIWFIRST] = {
178 .header_type = IW_HEADER_TYPE_POINT,
179 .token_size = sizeof(struct iw_thrspy),
180 .min_tokens = 1,
181 .max_tokens = 1,
182 },
183 [SIOCSIWAP - SIOCIWFIRST] = {
184 .header_type = IW_HEADER_TYPE_ADDR,
185 },
186 [SIOCGIWAP - SIOCIWFIRST] = {
187 .header_type = IW_HEADER_TYPE_ADDR,
188 .flags = IW_DESCR_FLAG_DUMP,
189 },
190 [SIOCSIWMLME - SIOCIWFIRST] = {
191 .header_type = IW_HEADER_TYPE_POINT,
192 .token_size = 1,
193 .min_tokens = sizeof(struct iw_mlme),
194 .max_tokens = sizeof(struct iw_mlme),
195 },
196 [SIOCGIWAPLIST - SIOCIWFIRST] = {
197 .header_type = IW_HEADER_TYPE_POINT,
198 .token_size = sizeof(struct sockaddr) +
199 sizeof(struct iw_quality),
200 .max_tokens = IW_MAX_AP,
201 .flags = IW_DESCR_FLAG_NOMAX,
202 },
203 [SIOCSIWSCAN - SIOCIWFIRST] = {
204 .header_type = IW_HEADER_TYPE_POINT,
205 .token_size = 1,
206 .min_tokens = 0,
207 .max_tokens = sizeof(struct iw_scan_req),
208 },
209 [SIOCGIWSCAN - SIOCIWFIRST] = {
210 .header_type = IW_HEADER_TYPE_POINT,
211 .token_size = 1,
212 .max_tokens = IW_SCAN_MAX_DATA,
213 .flags = IW_DESCR_FLAG_NOMAX,
214 },
215 [SIOCSIWESSID - SIOCIWFIRST] = {
216 .header_type = IW_HEADER_TYPE_POINT,
217 .token_size = 1,
218 .max_tokens = IW_ESSID_MAX_SIZE + 1,
219 .flags = IW_DESCR_FLAG_EVENT,
220 },
221 [SIOCGIWESSID - SIOCIWFIRST] = {
222 .header_type = IW_HEADER_TYPE_POINT,
223 .token_size = 1,
224 .max_tokens = IW_ESSID_MAX_SIZE + 1,
225 .flags = IW_DESCR_FLAG_DUMP,
226 },
227 [SIOCSIWNICKN - SIOCIWFIRST] = {
228 .header_type = IW_HEADER_TYPE_POINT,
229 .token_size = 1,
230 .max_tokens = IW_ESSID_MAX_SIZE + 1,
231 },
232 [SIOCGIWNICKN - SIOCIWFIRST] = {
233 .header_type = IW_HEADER_TYPE_POINT,
234 .token_size = 1,
235 .max_tokens = IW_ESSID_MAX_SIZE + 1,
236 },
237 [SIOCSIWRATE - SIOCIWFIRST] = {
238 .header_type = IW_HEADER_TYPE_PARAM,
239 },
240 [SIOCGIWRATE - SIOCIWFIRST] = {
241 .header_type = IW_HEADER_TYPE_PARAM,
242 },
243 [SIOCSIWRTS - SIOCIWFIRST] = {
244 .header_type = IW_HEADER_TYPE_PARAM,
245 },
246 [SIOCGIWRTS - SIOCIWFIRST] = {
247 .header_type = IW_HEADER_TYPE_PARAM,
248 },
249 [SIOCSIWFRAG - SIOCIWFIRST] = {
250 .header_type = IW_HEADER_TYPE_PARAM,
251 },
252 [SIOCGIWFRAG - SIOCIWFIRST] = {
253 .header_type = IW_HEADER_TYPE_PARAM,
254 },
255 [SIOCSIWTXPOW - SIOCIWFIRST] = {
256 .header_type = IW_HEADER_TYPE_PARAM,
257 },
258 [SIOCGIWTXPOW - SIOCIWFIRST] = {
259 .header_type = IW_HEADER_TYPE_PARAM,
260 },
261 [SIOCSIWRETRY - SIOCIWFIRST] = {
262 .header_type = IW_HEADER_TYPE_PARAM,
263 },
264 [SIOCGIWRETRY - SIOCIWFIRST] = {
265 .header_type = IW_HEADER_TYPE_PARAM,
266 },
267 [SIOCSIWENCODE - SIOCIWFIRST] = {
268 .header_type = IW_HEADER_TYPE_POINT,
269 .token_size = 1,
270 .max_tokens = IW_ENCODING_TOKEN_MAX,
271 .flags = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
272 },
273 [SIOCGIWENCODE - SIOCIWFIRST] = {
274 .header_type = IW_HEADER_TYPE_POINT,
275 .token_size = 1,
276 .max_tokens = IW_ENCODING_TOKEN_MAX,
277 .flags = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
278 },
279 [SIOCSIWPOWER - SIOCIWFIRST] = {
280 .header_type = IW_HEADER_TYPE_PARAM,
281 },
282 [SIOCGIWPOWER - SIOCIWFIRST] = {
283 .header_type = IW_HEADER_TYPE_PARAM,
284 },
285 [SIOCSIWGENIE - SIOCIWFIRST] = {
286 .header_type = IW_HEADER_TYPE_POINT,
287 .token_size = 1,
288 .max_tokens = IW_GENERIC_IE_MAX,
289 },
290 [SIOCGIWGENIE - SIOCIWFIRST] = {
291 .header_type = IW_HEADER_TYPE_POINT,
292 .token_size = 1,
293 .max_tokens = IW_GENERIC_IE_MAX,
294 },
295 [SIOCSIWAUTH - SIOCIWFIRST] = {
296 .header_type = IW_HEADER_TYPE_PARAM,
297 },
298 [SIOCGIWAUTH - SIOCIWFIRST] = {
299 .header_type = IW_HEADER_TYPE_PARAM,
300 },
301 [SIOCSIWENCODEEXT - SIOCIWFIRST] = {
302 .header_type = IW_HEADER_TYPE_POINT,
303 .token_size = 1,
304 .min_tokens = sizeof(struct iw_encode_ext),
305 .max_tokens = sizeof(struct iw_encode_ext) +
306 IW_ENCODING_TOKEN_MAX,
307 },
308 [SIOCGIWENCODEEXT - 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 [SIOCSIWPMKSA - SIOCIWFIRST] = {
316 .header_type = IW_HEADER_TYPE_POINT,
317 .token_size = 1,
318 .min_tokens = sizeof(struct iw_pmksa),
319 .max_tokens = sizeof(struct iw_pmksa),
320 },
321 };
322 static const int standard_ioctl_num = (sizeof(standard_ioctl) /
323 sizeof(struct iw_ioctl_description));
324
325 /*
326 * Meta-data about all the additional standard Wireless Extension events
327 * we know about.
328 */
329 static const struct iw_ioctl_description standard_event[] = {
330 [IWEVTXDROP - IWEVFIRST] = {
331 .header_type = IW_HEADER_TYPE_ADDR,
332 },
333 [IWEVQUAL - IWEVFIRST] = {
334 .header_type = IW_HEADER_TYPE_QUAL,
335 },
336 [IWEVCUSTOM - IWEVFIRST] = {
337 .header_type = IW_HEADER_TYPE_POINT,
338 .token_size = 1,
339 .max_tokens = IW_CUSTOM_MAX,
340 },
341 [IWEVREGISTERED - IWEVFIRST] = {
342 .header_type = IW_HEADER_TYPE_ADDR,
343 },
344 [IWEVEXPIRED - IWEVFIRST] = {
345 .header_type = IW_HEADER_TYPE_ADDR,
346 },
347 [IWEVGENIE - IWEVFIRST] = {
348 .header_type = IW_HEADER_TYPE_POINT,
349 .token_size = 1,
350 .max_tokens = IW_GENERIC_IE_MAX,
351 },
352 [IWEVMICHAELMICFAILURE - IWEVFIRST] = {
353 .header_type = IW_HEADER_TYPE_POINT,
354 .token_size = 1,
355 .max_tokens = sizeof(struct iw_michaelmicfailure),
356 },
357 [IWEVASSOCREQIE - IWEVFIRST] = {
358 .header_type = IW_HEADER_TYPE_POINT,
359 .token_size = 1,
360 .max_tokens = IW_GENERIC_IE_MAX,
361 },
362 [IWEVASSOCRESPIE - IWEVFIRST] = {
363 .header_type = IW_HEADER_TYPE_POINT,
364 .token_size = 1,
365 .max_tokens = IW_GENERIC_IE_MAX,
366 },
367 [IWEVPMKIDCAND - IWEVFIRST] = {
368 .header_type = IW_HEADER_TYPE_POINT,
369 .token_size = 1,
370 .max_tokens = sizeof(struct iw_pmkid_cand),
371 },
372 };
373 static const int standard_event_num = (sizeof(standard_event) /
374 sizeof(struct iw_ioctl_description));
375
376 /* Size (in bytes) of the various private data types */
377 static const char iw_priv_type_size[] = {
378 0, /* IW_PRIV_TYPE_NONE */
379 1, /* IW_PRIV_TYPE_BYTE */
380 1, /* IW_PRIV_TYPE_CHAR */
381 0, /* Not defined */
382 sizeof(__u32), /* IW_PRIV_TYPE_INT */
383 sizeof(struct iw_freq), /* IW_PRIV_TYPE_FLOAT */
384 sizeof(struct sockaddr), /* IW_PRIV_TYPE_ADDR */
385 0, /* Not defined */
386 };
387
388 /* Size (in bytes) of various events */
389 static const int event_type_size[] = {
390 IW_EV_LCP_LEN, /* IW_HEADER_TYPE_NULL */
391 0,
392 IW_EV_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
393 0,
394 IW_EV_UINT_LEN, /* IW_HEADER_TYPE_UINT */
395 IW_EV_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
396 IW_EV_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
397 0,
398 IW_EV_POINT_LEN, /* Without variable payload */
399 IW_EV_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
400 IW_EV_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
401 };
402
403 /************************ COMMON SUBROUTINES ************************/
404 /*
405 * Stuff that may be used in various place or doesn't fit in one
406 * of the section below.
407 */
408
409 /* ---------------------------------------------------------------- */
410 /*
411 * Return the driver handler associated with a specific Wireless Extension.
412 * Called from various place, so make sure it remains efficient.
413 */
414 static inline iw_handler get_handler(struct net_device *dev,
415 unsigned int cmd)
416 {
417 /* Don't "optimise" the following variable, it will crash */
418 unsigned int index; /* *MUST* be unsigned */
419
420 /* Check if we have some wireless handlers defined */
421 if(dev->wireless_handlers == NULL)
422 return NULL;
423
424 /* Try as a standard command */
425 index = cmd - SIOCIWFIRST;
426 if(index < dev->wireless_handlers->num_standard)
427 return dev->wireless_handlers->standard[index];
428
429 /* Try as a private command */
430 index = cmd - SIOCIWFIRSTPRIV;
431 if(index < dev->wireless_handlers->num_private)
432 return dev->wireless_handlers->private[index];
433
434 /* Not found */
435 return NULL;
436 }
437
438 /* ---------------------------------------------------------------- */
439 /*
440 * Get statistics out of the driver
441 */
442 static inline struct iw_statistics *get_wireless_stats(struct net_device *dev)
443 {
444 /* New location */
445 if((dev->wireless_handlers != NULL) &&
446 (dev->wireless_handlers->get_wireless_stats != NULL))
447 return dev->wireless_handlers->get_wireless_stats(dev);
448
449 /* Old location, will be phased out in next WE */
450 return (dev->get_wireless_stats ?
451 dev->get_wireless_stats(dev) :
452 (struct iw_statistics *) NULL);
453 }
454
455 /* ---------------------------------------------------------------- */
456 /*
457 * Call the commit handler in the driver
458 * (if exist and if conditions are right)
459 *
460 * Note : our current commit strategy is currently pretty dumb,
461 * but we will be able to improve on that...
462 * The goal is to try to agreagate as many changes as possible
463 * before doing the commit. Drivers that will define a commit handler
464 * are usually those that need a reset after changing parameters, so
465 * we want to minimise the number of reset.
466 * A cool idea is to use a timer : at each "set" command, we re-set the
467 * timer, when the timer eventually fires, we call the driver.
468 * Hopefully, more on that later.
469 *
470 * Also, I'm waiting to see how many people will complain about the
471 * netif_running(dev) test. I'm open on that one...
472 * Hopefully, the driver will remember to do a commit in "open()" ;-)
473 */
474 static inline int call_commit_handler(struct net_device * dev)
475 {
476 if((netif_running(dev)) &&
477 (dev->wireless_handlers->standard[0] != NULL)) {
478 /* Call the commit handler on the driver */
479 return dev->wireless_handlers->standard[0](dev, NULL,
480 NULL, NULL);
481 } else
482 return 0; /* Command completed successfully */
483 }
484
485 /* ---------------------------------------------------------------- */
486 /*
487 * Calculate size of private arguments
488 */
489 static inline int get_priv_size(__u16 args)
490 {
491 int num = args & IW_PRIV_SIZE_MASK;
492 int type = (args & IW_PRIV_TYPE_MASK) >> 12;
493
494 return num * iw_priv_type_size[type];
495 }
496
497 /* ---------------------------------------------------------------- */
498 /*
499 * Re-calculate the size of private arguments
500 */
501 static inline int adjust_priv_size(__u16 args,
502 union iwreq_data * wrqu)
503 {
504 int num = wrqu->data.length;
505 int max = args & IW_PRIV_SIZE_MASK;
506 int type = (args & IW_PRIV_TYPE_MASK) >> 12;
507
508 /* Make sure the driver doesn't goof up */
509 if (max < num)
510 num = max;
511
512 return num * iw_priv_type_size[type];
513 }
514
515
516 /******************** /proc/net/wireless SUPPORT ********************/
517 /*
518 * The /proc/net/wireless file is a human readable user-space interface
519 * exporting various wireless specific statistics from the wireless devices.
520 * This is the most popular part of the Wireless Extensions ;-)
521 *
522 * This interface is a pure clone of /proc/net/dev (in net/core/dev.c).
523 * The content of the file is basically the content of "struct iw_statistics".
524 */
525
526 #ifdef CONFIG_PROC_FS
527
528 /* ---------------------------------------------------------------- */
529 /*
530 * Print one entry (line) of /proc/net/wireless
531 */
532 static __inline__ void wireless_seq_printf_stats(struct seq_file *seq,
533 struct net_device *dev)
534 {
535 /* Get stats from the driver */
536 struct iw_statistics *stats = get_wireless_stats(dev);
537
538 if (stats) {
539 seq_printf(seq, "%6s: %04x %3d%c %3d%c %3d%c %6d %6d %6d "
540 "%6d %6d %6d\n",
541 dev->name, stats->status, stats->qual.qual,
542 stats->qual.updated & IW_QUAL_QUAL_UPDATED
543 ? '.' : ' ',
544 ((__u8) stats->qual.level),
545 stats->qual.updated & IW_QUAL_LEVEL_UPDATED
546 ? '.' : ' ',
547 ((__u8) stats->qual.noise),
548 stats->qual.updated & IW_QUAL_NOISE_UPDATED
549 ? '.' : ' ',
550 stats->discard.nwid, stats->discard.code,
551 stats->discard.fragment, stats->discard.retries,
552 stats->discard.misc, stats->miss.beacon);
553 stats->qual.updated = 0;
554 }
555 }
556
557 /* ---------------------------------------------------------------- */
558 /*
559 * Print info for /proc/net/wireless (print all entries)
560 */
561 static int wireless_seq_show(struct seq_file *seq, void *v)
562 {
563 if (v == SEQ_START_TOKEN)
564 seq_printf(seq, "Inter-| sta-| Quality | Discarded "
565 "packets | Missed | WE\n"
566 " face | tus | link level noise | nwid "
567 "crypt frag retry misc | beacon | %d\n",
568 WIRELESS_EXT);
569 else
570 wireless_seq_printf_stats(seq, v);
571 return 0;
572 }
573
574 static struct seq_operations wireless_seq_ops = {
575 .start = dev_seq_start,
576 .next = dev_seq_next,
577 .stop = dev_seq_stop,
578 .show = wireless_seq_show,
579 };
580
581 static int wireless_seq_open(struct inode *inode, struct file *file)
582 {
583 return seq_open(file, &wireless_seq_ops);
584 }
585
586 static struct file_operations wireless_seq_fops = {
587 .owner = THIS_MODULE,
588 .open = wireless_seq_open,
589 .read = seq_read,
590 .llseek = seq_lseek,
591 .release = seq_release,
592 };
593
594 int __init wireless_proc_init(void)
595 {
596 if (!proc_net_fops_create("wireless", S_IRUGO, &wireless_seq_fops))
597 return -ENOMEM;
598
599 return 0;
600 }
601 #endif /* CONFIG_PROC_FS */
602
603 /************************** IOCTL SUPPORT **************************/
604 /*
605 * The original user space API to configure all those Wireless Extensions
606 * is through IOCTLs.
607 * In there, we check if we need to call the new driver API (iw_handler)
608 * or just call the driver ioctl handler.
609 */
610
611 /* ---------------------------------------------------------------- */
612 /*
613 * Allow programatic access to /proc/net/wireless even if /proc
614 * doesn't exist... Also more efficient...
615 */
616 static inline int dev_iwstats(struct net_device *dev, struct ifreq *ifr)
617 {
618 /* Get stats from the driver */
619 struct iw_statistics *stats;
620
621 stats = get_wireless_stats(dev);
622 if (stats != (struct iw_statistics *) NULL) {
623 struct iwreq * wrq = (struct iwreq *)ifr;
624
625 /* Copy statistics to the user buffer */
626 if(copy_to_user(wrq->u.data.pointer, stats,
627 sizeof(struct iw_statistics)))
628 return -EFAULT;
629
630 /* Check if we need to clear the update flag */
631 if(wrq->u.data.flags != 0)
632 stats->qual.updated = 0;
633 return 0;
634 } else
635 return -EOPNOTSUPP;
636 }
637
638 /* ---------------------------------------------------------------- */
639 /*
640 * Export the driver private handler definition
641 * They will be picked up by tools like iwpriv...
642 */
643 static inline int ioctl_export_private(struct net_device * dev,
644 struct ifreq * ifr)
645 {
646 struct iwreq * iwr = (struct iwreq *) ifr;
647
648 /* Check if the driver has something to export */
649 if((dev->wireless_handlers->num_private_args == 0) ||
650 (dev->wireless_handlers->private_args == NULL))
651 return -EOPNOTSUPP;
652
653 /* Check NULL pointer */
654 if(iwr->u.data.pointer == NULL)
655 return -EFAULT;
656
657 /* Check if there is enough buffer up there */
658 if(iwr->u.data.length < dev->wireless_handlers->num_private_args) {
659 /* User space can't know in advance how large the buffer
660 * needs to be. Give it a hint, so that we can support
661 * any size buffer we want somewhat efficiently... */
662 iwr->u.data.length = dev->wireless_handlers->num_private_args;
663 return -E2BIG;
664 }
665
666 /* Set the number of available ioctls. */
667 iwr->u.data.length = dev->wireless_handlers->num_private_args;
668
669 /* Copy structure to the user buffer. */
670 if (copy_to_user(iwr->u.data.pointer,
671 dev->wireless_handlers->private_args,
672 sizeof(struct iw_priv_args) * iwr->u.data.length))
673 return -EFAULT;
674
675 return 0;
676 }
677
678 /* ---------------------------------------------------------------- */
679 /*
680 * Wrapper to call a standard Wireless Extension handler.
681 * We do various checks and also take care of moving data between
682 * user space and kernel space.
683 */
684 static inline int ioctl_standard_call(struct net_device * dev,
685 struct ifreq * ifr,
686 unsigned int cmd,
687 iw_handler handler)
688 {
689 struct iwreq * iwr = (struct iwreq *) ifr;
690 const struct iw_ioctl_description * descr;
691 struct iw_request_info info;
692 int ret = -EINVAL;
693
694 /* Get the description of the IOCTL */
695 if((cmd - SIOCIWFIRST) >= standard_ioctl_num)
696 return -EOPNOTSUPP;
697 descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
698
699 #ifdef WE_IOCTL_DEBUG
700 printk(KERN_DEBUG "%s (WE) : Found standard handler for 0x%04X\n",
701 ifr->ifr_name, cmd);
702 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);
703 #endif /* WE_IOCTL_DEBUG */
704
705 /* Prepare the call */
706 info.cmd = cmd;
707 info.flags = 0;
708
709 /* Check if we have a pointer to user space data or not */
710 if(descr->header_type != IW_HEADER_TYPE_POINT) {
711
712 /* No extra arguments. Trivial to handle */
713 ret = handler(dev, &info, &(iwr->u), NULL);
714
715 #ifdef WE_SET_EVENT
716 /* Generate an event to notify listeners of the change */
717 if((descr->flags & IW_DESCR_FLAG_EVENT) &&
718 ((ret == 0) || (ret == -EIWCOMMIT)))
719 wireless_send_event(dev, cmd, &(iwr->u), NULL);
720 #endif /* WE_SET_EVENT */
721 } else {
722 char * extra;
723 int extra_size;
724 int user_length = 0;
725 int err;
726
727 /* Calculate space needed by arguments. Always allocate
728 * for max space. Easier, and won't last long... */
729 extra_size = descr->max_tokens * descr->token_size;
730
731 /* Check what user space is giving us */
732 if(IW_IS_SET(cmd)) {
733 /* Check NULL pointer */
734 if((iwr->u.data.pointer == NULL) &&
735 (iwr->u.data.length != 0))
736 return -EFAULT;
737 /* Check if number of token fits within bounds */
738 if(iwr->u.data.length > descr->max_tokens)
739 return -E2BIG;
740 if(iwr->u.data.length < descr->min_tokens)
741 return -EINVAL;
742 } else {
743 /* Check NULL pointer */
744 if(iwr->u.data.pointer == NULL)
745 return -EFAULT;
746 /* Save user space buffer size for checking */
747 user_length = iwr->u.data.length;
748
749 /* Don't check if user_length > max to allow forward
750 * compatibility. The test user_length < min is
751 * implied by the test at the end. */
752
753 /* Support for very large requests */
754 if((descr->flags & IW_DESCR_FLAG_NOMAX) &&
755 (user_length > descr->max_tokens)) {
756 /* Allow userspace to GET more than max so
757 * we can support any size GET requests.
758 * There is still a limit : -ENOMEM. */
759 extra_size = user_length * descr->token_size;
760 /* Note : user_length is originally a __u16,
761 * and token_size is controlled by us,
762 * so extra_size won't get negative and
763 * won't overflow... */
764 }
765 }
766
767 #ifdef WE_IOCTL_DEBUG
768 printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n",
769 dev->name, extra_size);
770 #endif /* WE_IOCTL_DEBUG */
771
772 /* Create the kernel buffer */
773 extra = kmalloc(extra_size, GFP_KERNEL);
774 if (extra == NULL) {
775 return -ENOMEM;
776 }
777
778 /* If it is a SET, get all the extra data in here */
779 if(IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
780 err = copy_from_user(extra, iwr->u.data.pointer,
781 iwr->u.data.length *
782 descr->token_size);
783 if (err) {
784 kfree(extra);
785 return -EFAULT;
786 }
787 #ifdef WE_IOCTL_DEBUG
788 printk(KERN_DEBUG "%s (WE) : Got %d bytes\n",
789 dev->name,
790 iwr->u.data.length * descr->token_size);
791 #endif /* WE_IOCTL_DEBUG */
792 }
793
794 /* Call the handler */
795 ret = handler(dev, &info, &(iwr->u), extra);
796
797 /* If we have something to return to the user */
798 if (!ret && IW_IS_GET(cmd)) {
799 /* Check if there is enough buffer up there */
800 if(user_length < iwr->u.data.length) {
801 kfree(extra);
802 return -E2BIG;
803 }
804
805 err = copy_to_user(iwr->u.data.pointer, extra,
806 iwr->u.data.length *
807 descr->token_size);
808 if (err)
809 ret = -EFAULT;
810 #ifdef WE_IOCTL_DEBUG
811 printk(KERN_DEBUG "%s (WE) : Wrote %d bytes\n",
812 dev->name,
813 iwr->u.data.length * descr->token_size);
814 #endif /* WE_IOCTL_DEBUG */
815 }
816
817 #ifdef WE_SET_EVENT
818 /* Generate an event to notify listeners of the change */
819 if((descr->flags & IW_DESCR_FLAG_EVENT) &&
820 ((ret == 0) || (ret == -EIWCOMMIT))) {
821 if(descr->flags & IW_DESCR_FLAG_RESTRICT)
822 /* If the event is restricted, don't
823 * export the payload */
824 wireless_send_event(dev, cmd, &(iwr->u), NULL);
825 else
826 wireless_send_event(dev, cmd, &(iwr->u),
827 extra);
828 }
829 #endif /* WE_SET_EVENT */
830
831 /* Cleanup - I told you it wasn't that long ;-) */
832 kfree(extra);
833 }
834
835 /* Call commit handler if needed and defined */
836 if(ret == -EIWCOMMIT)
837 ret = call_commit_handler(dev);
838
839 /* Here, we will generate the appropriate event if needed */
840
841 return ret;
842 }
843
844 /* ---------------------------------------------------------------- */
845 /*
846 * Wrapper to call a private Wireless Extension handler.
847 * We do various checks and also take care of moving data between
848 * user space and kernel space.
849 * It's not as nice and slimline as the standard wrapper. The cause
850 * is struct iw_priv_args, which was not really designed for the
851 * job we are going here.
852 *
853 * IMPORTANT : This function prevent to set and get data on the same
854 * IOCTL and enforce the SET/GET convention. Not doing it would be
855 * far too hairy...
856 * If you need to set and get data at the same time, please don't use
857 * a iw_handler but process it in your ioctl handler (i.e. use the
858 * old driver API).
859 */
860 static inline int ioctl_private_call(struct net_device * dev,
861 struct ifreq * ifr,
862 unsigned int cmd,
863 iw_handler handler)
864 {
865 struct iwreq * iwr = (struct iwreq *) ifr;
866 const struct iw_priv_args * descr = NULL;
867 struct iw_request_info info;
868 int extra_size = 0;
869 int i;
870 int ret = -EINVAL;
871
872 /* Get the description of the IOCTL */
873 for(i = 0; i < dev->wireless_handlers->num_private_args; i++)
874 if(cmd == dev->wireless_handlers->private_args[i].cmd) {
875 descr = &(dev->wireless_handlers->private_args[i]);
876 break;
877 }
878
879 #ifdef WE_IOCTL_DEBUG
880 printk(KERN_DEBUG "%s (WE) : Found private handler for 0x%04X\n",
881 ifr->ifr_name, cmd);
882 if(descr) {
883 printk(KERN_DEBUG "%s (WE) : Name %s, set %X, get %X\n",
884 dev->name, descr->name,
885 descr->set_args, descr->get_args);
886 }
887 #endif /* WE_IOCTL_DEBUG */
888
889 /* Compute the size of the set/get arguments */
890 if(descr != NULL) {
891 if(IW_IS_SET(cmd)) {
892 int offset = 0; /* For sub-ioctls */
893 /* Check for sub-ioctl handler */
894 if(descr->name[0] == '\0')
895 /* Reserve one int for sub-ioctl index */
896 offset = sizeof(__u32);
897
898 /* Size of set arguments */
899 extra_size = get_priv_size(descr->set_args);
900
901 /* Does it fits in iwr ? */
902 if((descr->set_args & IW_PRIV_SIZE_FIXED) &&
903 ((extra_size + offset) <= IFNAMSIZ))
904 extra_size = 0;
905 } else {
906 /* Size of get arguments */
907 extra_size = get_priv_size(descr->get_args);
908
909 /* Does it fits in iwr ? */
910 if((descr->get_args & IW_PRIV_SIZE_FIXED) &&
911 (extra_size <= IFNAMSIZ))
912 extra_size = 0;
913 }
914 }
915
916 /* Prepare the call */
917 info.cmd = cmd;
918 info.flags = 0;
919
920 /* Check if we have a pointer to user space data or not. */
921 if(extra_size == 0) {
922 /* No extra arguments. Trivial to handle */
923 ret = handler(dev, &info, &(iwr->u), (char *) &(iwr->u));
924 } else {
925 char * extra;
926 int err;
927
928 /* Check what user space is giving us */
929 if(IW_IS_SET(cmd)) {
930 /* Check NULL pointer */
931 if((iwr->u.data.pointer == NULL) &&
932 (iwr->u.data.length != 0))
933 return -EFAULT;
934
935 /* Does it fits within bounds ? */
936 if(iwr->u.data.length > (descr->set_args &
937 IW_PRIV_SIZE_MASK))
938 return -E2BIG;
939 } else {
940 /* Check NULL pointer */
941 if(iwr->u.data.pointer == NULL)
942 return -EFAULT;
943 }
944
945 #ifdef WE_IOCTL_DEBUG
946 printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n",
947 dev->name, extra_size);
948 #endif /* WE_IOCTL_DEBUG */
949
950 /* Always allocate for max space. Easier, and won't last
951 * long... */
952 extra = kmalloc(extra_size, GFP_KERNEL);
953 if (extra == NULL) {
954 return -ENOMEM;
955 }
956
957 /* If it is a SET, get all the extra data in here */
958 if(IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
959 err = copy_from_user(extra, iwr->u.data.pointer,
960 extra_size);
961 if (err) {
962 kfree(extra);
963 return -EFAULT;
964 }
965 #ifdef WE_IOCTL_DEBUG
966 printk(KERN_DEBUG "%s (WE) : Got %d elem\n",
967 dev->name, iwr->u.data.length);
968 #endif /* WE_IOCTL_DEBUG */
969 }
970
971 /* Call the handler */
972 ret = handler(dev, &info, &(iwr->u), extra);
973
974 /* If we have something to return to the user */
975 if (!ret && IW_IS_GET(cmd)) {
976
977 /* Adjust for the actual length if it's variable,
978 * avoid leaking kernel bits outside. */
979 if (!(descr->get_args & IW_PRIV_SIZE_FIXED)) {
980 extra_size = adjust_priv_size(descr->get_args,
981 &(iwr->u));
982 }
983
984 err = copy_to_user(iwr->u.data.pointer, extra,
985 extra_size);
986 if (err)
987 ret = -EFAULT;
988 #ifdef WE_IOCTL_DEBUG
989 printk(KERN_DEBUG "%s (WE) : Wrote %d elem\n",
990 dev->name, iwr->u.data.length);
991 #endif /* WE_IOCTL_DEBUG */
992 }
993
994 /* Cleanup - I told you it wasn't that long ;-) */
995 kfree(extra);
996 }
997
998
999 /* Call commit handler if needed and defined */
1000 if(ret == -EIWCOMMIT)
1001 ret = call_commit_handler(dev);
1002
1003 return ret;
1004 }
1005
1006 /* ---------------------------------------------------------------- */
1007 /*
1008 * Main IOCTl dispatcher. Called from the main networking code
1009 * (dev_ioctl() in net/core/dev.c).
1010 * Check the type of IOCTL and call the appropriate wrapper...
1011 */
1012 int wireless_process_ioctl(struct ifreq *ifr, unsigned int cmd)
1013 {
1014 struct net_device *dev;
1015 iw_handler handler;
1016
1017 /* Permissions are already checked in dev_ioctl() before calling us.
1018 * The copy_to/from_user() of ifr is also dealt with in there */
1019
1020 /* Make sure the device exist */
1021 if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL)
1022 return -ENODEV;
1023
1024 /* A bunch of special cases, then the generic case...
1025 * Note that 'cmd' is already filtered in dev_ioctl() with
1026 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
1027 switch(cmd)
1028 {
1029 case SIOCGIWSTATS:
1030 /* Get Wireless Stats */
1031 return dev_iwstats(dev, ifr);
1032
1033 case SIOCGIWPRIV:
1034 /* Check if we have some wireless handlers defined */
1035 if(dev->wireless_handlers != NULL) {
1036 /* We export to user space the definition of
1037 * the private handler ourselves */
1038 return ioctl_export_private(dev, ifr);
1039 }
1040 // ## Fall-through for old API ##
1041 default:
1042 /* Generic IOCTL */
1043 /* Basic check */
1044 if (!netif_device_present(dev))
1045 return -ENODEV;
1046 /* New driver API : try to find the handler */
1047 handler = get_handler(dev, cmd);
1048 if(handler != NULL) {
1049 /* Standard and private are not the same */
1050 if(cmd < SIOCIWFIRSTPRIV)
1051 return ioctl_standard_call(dev,
1052 ifr,
1053 cmd,
1054 handler);
1055 else
1056 return ioctl_private_call(dev,
1057 ifr,
1058 cmd,
1059 handler);
1060 }
1061 /* Old driver API : call driver ioctl handler */
1062 if (dev->do_ioctl) {
1063 return dev->do_ioctl(dev, ifr, cmd);
1064 }
1065 return -EOPNOTSUPP;
1066 }
1067 /* Not reached */
1068 return -EINVAL;
1069 }
1070
1071 /************************* EVENT PROCESSING *************************/
1072 /*
1073 * Process events generated by the wireless layer or the driver.
1074 * Most often, the event will be propagated through rtnetlink
1075 */
1076
1077 #ifdef WE_EVENT_NETLINK
1078 /* "rtnl" is defined in net/core/rtnetlink.c, but we need it here.
1079 * It is declared in <linux/rtnetlink.h> */
1080
1081 /* ---------------------------------------------------------------- */
1082 /*
1083 * Fill a rtnetlink message with our event data.
1084 * Note that we propage only the specified event and don't dump the
1085 * current wireless config. Dumping the wireless config is far too
1086 * expensive (for each parameter, the driver need to query the hardware).
1087 */
1088 static inline int rtnetlink_fill_iwinfo(struct sk_buff * skb,
1089 struct net_device * dev,
1090 int type,
1091 char * event,
1092 int event_len)
1093 {
1094 struct ifinfomsg *r;
1095 struct nlmsghdr *nlh;
1096 unsigned char *b = skb->tail;
1097
1098 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(*r));
1099 r = NLMSG_DATA(nlh);
1100 r->ifi_family = AF_UNSPEC;
1101 r->__ifi_pad = 0;
1102 r->ifi_type = dev->type;
1103 r->ifi_index = dev->ifindex;
1104 r->ifi_flags = dev->flags;
1105 r->ifi_change = 0; /* Wireless changes don't affect those flags */
1106
1107 /* Add the wireless events in the netlink packet */
1108 RTA_PUT(skb, IFLA_WIRELESS,
1109 event_len, event);
1110
1111 nlh->nlmsg_len = skb->tail - b;
1112 return skb->len;
1113
1114 nlmsg_failure:
1115 rtattr_failure:
1116 skb_trim(skb, b - skb->data);
1117 return -1;
1118 }
1119
1120 /* ---------------------------------------------------------------- */
1121 /*
1122 * Create and broadcast and send it on the standard rtnetlink socket
1123 * This is a pure clone rtmsg_ifinfo() in net/core/rtnetlink.c
1124 * Andrzej Krzysztofowicz mandated that I used a IFLA_XXX field
1125 * within a RTM_NEWLINK event.
1126 */
1127 static inline void rtmsg_iwinfo(struct net_device * dev,
1128 char * event,
1129 int event_len)
1130 {
1131 struct sk_buff *skb;
1132 int size = NLMSG_GOODSIZE;
1133
1134 skb = alloc_skb(size, GFP_ATOMIC);
1135 if (!skb)
1136 return;
1137
1138 if (rtnetlink_fill_iwinfo(skb, dev, RTM_NEWLINK,
1139 event, event_len) < 0) {
1140 kfree_skb(skb);
1141 return;
1142 }
1143 NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
1144 netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_ATOMIC);
1145 }
1146 #endif /* WE_EVENT_NETLINK */
1147
1148 /* ---------------------------------------------------------------- */
1149 /*
1150 * Main event dispatcher. Called from other parts and drivers.
1151 * Send the event on the appropriate channels.
1152 * May be called from interrupt context.
1153 */
1154 void wireless_send_event(struct net_device * dev,
1155 unsigned int cmd,
1156 union iwreq_data * wrqu,
1157 char * extra)
1158 {
1159 const struct iw_ioctl_description * descr = NULL;
1160 int extra_len = 0;
1161 struct iw_event *event; /* Mallocated whole event */
1162 int event_len; /* Its size */
1163 int hdr_len; /* Size of the event header */
1164 /* Don't "optimise" the following variable, it will crash */
1165 unsigned cmd_index; /* *MUST* be unsigned */
1166
1167 /* Get the description of the IOCTL */
1168 if(cmd <= SIOCIWLAST) {
1169 cmd_index = cmd - SIOCIWFIRST;
1170 if(cmd_index < standard_ioctl_num)
1171 descr = &(standard_ioctl[cmd_index]);
1172 } else {
1173 cmd_index = cmd - IWEVFIRST;
1174 if(cmd_index < standard_event_num)
1175 descr = &(standard_event[cmd_index]);
1176 }
1177 /* Don't accept unknown events */
1178 if(descr == NULL) {
1179 /* Note : we don't return an error to the driver, because
1180 * the driver would not know what to do about it. It can't
1181 * return an error to the user, because the event is not
1182 * initiated by a user request.
1183 * The best the driver could do is to log an error message.
1184 * We will do it ourselves instead...
1185 */
1186 printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
1187 dev->name, cmd);
1188 return;
1189 }
1190 #ifdef WE_EVENT_DEBUG
1191 printk(KERN_DEBUG "%s (WE) : Got event 0x%04X\n",
1192 dev->name, cmd);
1193 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);
1194 #endif /* WE_EVENT_DEBUG */
1195
1196 /* Check extra parameters and set extra_len */
1197 if(descr->header_type == IW_HEADER_TYPE_POINT) {
1198 /* Check if number of token fits within bounds */
1199 if(wrqu->data.length > descr->max_tokens) {
1200 printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length);
1201 return;
1202 }
1203 if(wrqu->data.length < descr->min_tokens) {
1204 printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, wrqu->data.length);
1205 return;
1206 }
1207 /* Calculate extra_len - extra is NULL for restricted events */
1208 if(extra != NULL)
1209 extra_len = wrqu->data.length * descr->token_size;
1210 #ifdef WE_EVENT_DEBUG
1211 printk(KERN_DEBUG "%s (WE) : Event 0x%04X, tokens %d, extra_len %d\n", dev->name, cmd, wrqu->data.length, extra_len);
1212 #endif /* WE_EVENT_DEBUG */
1213 }
1214
1215 /* Total length of the event */
1216 hdr_len = event_type_size[descr->header_type];
1217 event_len = hdr_len + extra_len;
1218
1219 #ifdef WE_EVENT_DEBUG
1220 printk(KERN_DEBUG "%s (WE) : Event 0x%04X, hdr_len %d, event_len %d\n", dev->name, cmd, hdr_len, event_len);
1221 #endif /* WE_EVENT_DEBUG */
1222
1223 /* Create temporary buffer to hold the event */
1224 event = kmalloc(event_len, GFP_ATOMIC);
1225 if(event == NULL)
1226 return;
1227
1228 /* Fill event */
1229 event->len = event_len;
1230 event->cmd = cmd;
1231 memcpy(&event->u, wrqu, hdr_len - IW_EV_LCP_LEN);
1232 if(extra != NULL)
1233 memcpy(((char *) event) + hdr_len, extra, extra_len);
1234
1235 #ifdef WE_EVENT_NETLINK
1236 /* rtnetlink event channel */
1237 rtmsg_iwinfo(dev, (char *) event, event_len);
1238 #endif /* WE_EVENT_NETLINK */
1239
1240 /* Cleanup */
1241 kfree(event);
1242
1243 return; /* Always success, I guess ;-) */
1244 }
1245
1246 /********************** ENHANCED IWSPY SUPPORT **********************/
1247 /*
1248 * In the old days, the driver was handling spy support all by itself.
1249 * Now, the driver can delegate this task to Wireless Extensions.
1250 * It needs to use those standard spy iw_handler in struct iw_handler_def,
1251 * push data to us via wireless_spy_update() and include struct iw_spy_data
1252 * in its private part (and advertise it in iw_handler_def->spy_offset).
1253 * One of the main advantage of centralising spy support here is that
1254 * it becomes much easier to improve and extend it without having to touch
1255 * the drivers. One example is the addition of the Spy-Threshold events.
1256 */
1257
1258 /* ---------------------------------------------------------------- */
1259 /*
1260 * Return the pointer to the spy data in the driver.
1261 * Because this is called on the Rx path via wireless_spy_update(),
1262 * we want it to be efficient...
1263 */
1264 static inline struct iw_spy_data * get_spydata(struct net_device *dev)
1265 {
1266 /* This is the new way */
1267 if(dev->wireless_data)
1268 return(dev->wireless_data->spy_data);
1269
1270 /* This is the old way. Doesn't work for multi-headed drivers.
1271 * It will be removed in the next version of WE. */
1272 return (dev->priv + dev->wireless_handlers->spy_offset);
1273 }
1274
1275 /*------------------------------------------------------------------*/
1276 /*
1277 * Standard Wireless Handler : set Spy List
1278 */
1279 int iw_handler_set_spy(struct net_device * dev,
1280 struct iw_request_info * info,
1281 union iwreq_data * wrqu,
1282 char * extra)
1283 {
1284 struct iw_spy_data * spydata = get_spydata(dev);
1285 struct sockaddr * address = (struct sockaddr *) extra;
1286
1287 if(!dev->wireless_data)
1288 /* Help user know that driver needs updating */
1289 printk(KERN_DEBUG "%s (WE) : Driver using old/buggy spy support, please fix driver !\n",
1290 dev->name);
1291 /* Make sure driver is not buggy or using the old API */
1292 if(!spydata)
1293 return -EOPNOTSUPP;
1294
1295 /* Disable spy collection while we copy the addresses.
1296 * While we copy addresses, any call to wireless_spy_update()
1297 * will NOP. This is OK, as anyway the addresses are changing. */
1298 spydata->spy_number = 0;
1299
1300 /* We want to operate without locking, because wireless_spy_update()
1301 * most likely will happen in the interrupt handler, and therefore
1302 * have its own locking constraints and needs performance.
1303 * The rtnl_lock() make sure we don't race with the other iw_handlers.
1304 * This make sure wireless_spy_update() "see" that the spy list
1305 * is temporarily disabled. */
1306 wmb();
1307
1308 /* Are there are addresses to copy? */
1309 if(wrqu->data.length > 0) {
1310 int i;
1311
1312 /* Copy addresses */
1313 for(i = 0; i < wrqu->data.length; i++)
1314 memcpy(spydata->spy_address[i], address[i].sa_data,
1315 ETH_ALEN);
1316 /* Reset stats */
1317 memset(spydata->spy_stat, 0,
1318 sizeof(struct iw_quality) * IW_MAX_SPY);
1319
1320 #ifdef WE_SPY_DEBUG
1321 printk(KERN_DEBUG "iw_handler_set_spy() : offset %ld, spydata %p, num %d\n", dev->wireless_handlers->spy_offset, spydata, wrqu->data.length);
1322 for (i = 0; i < wrqu->data.length; i++)
1323 printk(KERN_DEBUG
1324 "%02X:%02X:%02X:%02X:%02X:%02X \n",
1325 spydata->spy_address[i][0],
1326 spydata->spy_address[i][1],
1327 spydata->spy_address[i][2],
1328 spydata->spy_address[i][3],
1329 spydata->spy_address[i][4],
1330 spydata->spy_address[i][5]);
1331 #endif /* WE_SPY_DEBUG */
1332 }
1333
1334 /* Make sure above is updated before re-enabling */
1335 wmb();
1336
1337 /* Enable addresses */
1338 spydata->spy_number = wrqu->data.length;
1339
1340 return 0;
1341 }
1342
1343 /*------------------------------------------------------------------*/
1344 /*
1345 * Standard Wireless Handler : get Spy List
1346 */
1347 int iw_handler_get_spy(struct net_device * dev,
1348 struct iw_request_info * info,
1349 union iwreq_data * wrqu,
1350 char * extra)
1351 {
1352 struct iw_spy_data * spydata = get_spydata(dev);
1353 struct sockaddr * address = (struct sockaddr *) extra;
1354 int i;
1355
1356 /* Make sure driver is not buggy or using the old API */
1357 if(!spydata)
1358 return -EOPNOTSUPP;
1359
1360 wrqu->data.length = spydata->spy_number;
1361
1362 /* Copy addresses. */
1363 for(i = 0; i < spydata->spy_number; i++) {
1364 memcpy(address[i].sa_data, spydata->spy_address[i], ETH_ALEN);
1365 address[i].sa_family = AF_UNIX;
1366 }
1367 /* Copy stats to the user buffer (just after). */
1368 if(spydata->spy_number > 0)
1369 memcpy(extra + (sizeof(struct sockaddr) *spydata->spy_number),
1370 spydata->spy_stat,
1371 sizeof(struct iw_quality) * spydata->spy_number);
1372 /* Reset updated flags. */
1373 for(i = 0; i < spydata->spy_number; i++)
1374 spydata->spy_stat[i].updated = 0;
1375 return 0;
1376 }
1377
1378 /*------------------------------------------------------------------*/
1379 /*
1380 * Standard Wireless Handler : set spy threshold
1381 */
1382 int iw_handler_set_thrspy(struct net_device * dev,
1383 struct iw_request_info *info,
1384 union iwreq_data * wrqu,
1385 char * extra)
1386 {
1387 struct iw_spy_data * spydata = get_spydata(dev);
1388 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
1389
1390 /* Make sure driver is not buggy or using the old API */
1391 if(!spydata)
1392 return -EOPNOTSUPP;
1393
1394 /* Just do it */
1395 memcpy(&(spydata->spy_thr_low), &(threshold->low),
1396 2 * sizeof(struct iw_quality));
1397
1398 /* Clear flag */
1399 memset(spydata->spy_thr_under, '\0', sizeof(spydata->spy_thr_under));
1400
1401 #ifdef WE_SPY_DEBUG
1402 printk(KERN_DEBUG "iw_handler_set_thrspy() : low %d ; high %d\n", spydata->spy_thr_low.level, spydata->spy_thr_high.level);
1403 #endif /* WE_SPY_DEBUG */
1404
1405 return 0;
1406 }
1407
1408 /*------------------------------------------------------------------*/
1409 /*
1410 * Standard Wireless Handler : get spy threshold
1411 */
1412 int iw_handler_get_thrspy(struct net_device * dev,
1413 struct iw_request_info *info,
1414 union iwreq_data * wrqu,
1415 char * extra)
1416 {
1417 struct iw_spy_data * spydata = get_spydata(dev);
1418 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
1419
1420 /* Make sure driver is not buggy or using the old API */
1421 if(!spydata)
1422 return -EOPNOTSUPP;
1423
1424 /* Just do it */
1425 memcpy(&(threshold->low), &(spydata->spy_thr_low),
1426 2 * sizeof(struct iw_quality));
1427
1428 return 0;
1429 }
1430
1431 /*------------------------------------------------------------------*/
1432 /*
1433 * Prepare and send a Spy Threshold event
1434 */
1435 static void iw_send_thrspy_event(struct net_device * dev,
1436 struct iw_spy_data * spydata,
1437 unsigned char * address,
1438 struct iw_quality * wstats)
1439 {
1440 union iwreq_data wrqu;
1441 struct iw_thrspy threshold;
1442
1443 /* Init */
1444 wrqu.data.length = 1;
1445 wrqu.data.flags = 0;
1446 /* Copy address */
1447 memcpy(threshold.addr.sa_data, address, ETH_ALEN);
1448 threshold.addr.sa_family = ARPHRD_ETHER;
1449 /* Copy stats */
1450 memcpy(&(threshold.qual), wstats, sizeof(struct iw_quality));
1451 /* Copy also thresholds */
1452 memcpy(&(threshold.low), &(spydata->spy_thr_low),
1453 2 * sizeof(struct iw_quality));
1454
1455 #ifdef WE_SPY_DEBUG
1456 printk(KERN_DEBUG "iw_send_thrspy_event() : address %02X:%02X:%02X:%02X:%02X:%02X, level %d, up = %d\n",
1457 threshold.addr.sa_data[0],
1458 threshold.addr.sa_data[1],
1459 threshold.addr.sa_data[2],
1460 threshold.addr.sa_data[3],
1461 threshold.addr.sa_data[4],
1462 threshold.addr.sa_data[5], threshold.qual.level);
1463 #endif /* WE_SPY_DEBUG */
1464
1465 /* Send event to user space */
1466 wireless_send_event(dev, SIOCGIWTHRSPY, &wrqu, (char *) &threshold);
1467 }
1468
1469 /* ---------------------------------------------------------------- */
1470 /*
1471 * Call for the driver to update the spy data.
1472 * For now, the spy data is a simple array. As the size of the array is
1473 * small, this is good enough. If we wanted to support larger number of
1474 * spy addresses, we should use something more efficient...
1475 */
1476 void wireless_spy_update(struct net_device * dev,
1477 unsigned char * address,
1478 struct iw_quality * wstats)
1479 {
1480 struct iw_spy_data * spydata = get_spydata(dev);
1481 int i;
1482 int match = -1;
1483
1484 /* Make sure driver is not buggy or using the old API */
1485 if(!spydata)
1486 return;
1487
1488 #ifdef WE_SPY_DEBUG
1489 printk(KERN_DEBUG "wireless_spy_update() : offset %ld, spydata %p, address %02X:%02X:%02X:%02X:%02X:%02X\n", dev->wireless_handlers->spy_offset, spydata, address[0], address[1], address[2], address[3], address[4], address[5]);
1490 #endif /* WE_SPY_DEBUG */
1491
1492 /* Update all records that match */
1493 for(i = 0; i < spydata->spy_number; i++)
1494 if(!memcmp(address, spydata->spy_address[i], ETH_ALEN)) {
1495 memcpy(&(spydata->spy_stat[i]), wstats,
1496 sizeof(struct iw_quality));
1497 match = i;
1498 }
1499
1500 /* Generate an event if we cross the spy threshold.
1501 * To avoid event storms, we have a simple hysteresis : we generate
1502 * event only when we go under the low threshold or above the
1503 * high threshold. */
1504 if(match >= 0) {
1505 if(spydata->spy_thr_under[match]) {
1506 if(wstats->level > spydata->spy_thr_high.level) {
1507 spydata->spy_thr_under[match] = 0;
1508 iw_send_thrspy_event(dev, spydata,
1509 address, wstats);
1510 }
1511 } else {
1512 if(wstats->level < spydata->spy_thr_low.level) {
1513 spydata->spy_thr_under[match] = 1;
1514 iw_send_thrspy_event(dev, spydata,
1515 address, wstats);
1516 }
1517 }
1518 }
1519 }
1520
1521 EXPORT_SYMBOL(iw_handler_get_spy);
1522 EXPORT_SYMBOL(iw_handler_get_thrspy);
1523 EXPORT_SYMBOL(iw_handler_set_spy);
1524 EXPORT_SYMBOL(iw_handler_set_thrspy);
1525 EXPORT_SYMBOL(wireless_send_event);
1526 EXPORT_SYMBOL(wireless_spy_update);
Linus' kernel tree