?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 2.6.19-rc6
[cris-mirror.git] / net / core / wireless.c
blobcb1b8728d7eec0c55c6151da9fba7d00f42747e9
1 /*
2 * This file implement the Wireless Extensions APIs.
3 *
4 * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
5 * Copyright (c) 1997-2006 Jean Tourrilhes, All Rights Reserved.
6 *
7 * (As all part of the Linux kernel, this file is GPL)
8 */
9
10 /************************** DOCUMENTATION **************************/
11 /*
12 * API definition :
13 * --------------
14 * See <linux/wireless.h> for details of the APIs and the rest.
15 *
16 * History :
17 * -------
18 *
19 * v1 - 5.12.01 - Jean II
20 * o Created this file.
21 *
22 * v2 - 13.12.01 - Jean II
23 * o Move /proc/net/wireless stuff from net/core/dev.c to here
24 * o Make Wireless Extension IOCTLs go through here
25 * o Added iw_handler handling ;-)
26 * o Added standard ioctl description
27 * o Initial dumb commit strategy based on orinoco.c
28 *
29 * v3 - 19.12.01 - Jean II
30 * o Make sure we don't go out of standard_ioctl[] in ioctl_standard_call
31 * o Add event dispatcher function
32 * o Add event description
33 * o Propagate events as rtnetlink IFLA_WIRELESS option
34 * o Generate event on selected SET requests
35 *
36 * v4 - 18.04.02 - Jean II
37 * o Fix stupid off by one in iw_ioctl_description : IW_ESSID_MAX_SIZE + 1
38 *
39 * v5 - 21.06.02 - Jean II
40 * o Add IW_PRIV_TYPE_ADDR in priv_type_size (+cleanup)
41 * o Reshuffle IW_HEADER_TYPE_XXX to map IW_PRIV_TYPE_XXX changes
42 * o Add IWEVCUSTOM for driver specific event/scanning token
43 * o Turn on WE_STRICT_WRITE by default + kernel warning
44 * o Fix WE_STRICT_WRITE in ioctl_export_private() (32 => iw_num)
45 * o Fix off-by-one in test (extra_size <= IFNAMSIZ)
46 *
47 * v6 - 9.01.03 - Jean II
48 * o Add common spy support : iw_handler_set_spy(), wireless_spy_update()
49 * o Add enhanced spy support : iw_handler_set_thrspy() and event.
50 * o Add WIRELESS_EXT version display in /proc/net/wireless
51 *
52 * v6 - 18.06.04 - Jean II
53 * o Change get_spydata() method for added safety
54 * o Remove spy #ifdef, they are always on -> cleaner code
55 * o Allow any size GET request if user specifies length > max
56 * and if request has IW_DESCR_FLAG_NOMAX flag or is SIOCGIWPRIV
57 * o Start migrating get_wireless_stats to struct iw_handler_def
58 * o Add wmb() in iw_handler_set_spy() for non-coherent archs/cpus
59 * Based on patch from Pavel Roskin <proski@gnu.org> :
60 * o Fix kernel data leak to user space in private handler handling
61 *
62 * v7 - 18.3.05 - Jean II
63 * o Remove (struct iw_point *)->pointer from events and streams
64 * o Remove spy_offset from struct iw_handler_def
65 * o Start deprecating dev->get_wireless_stats, output a warning
66 * o If IW_QUAL_DBM is set, show dBm values in /proc/net/wireless
67 * o Don't loose INVALID/DBM flags when clearing UPDATED flags (iwstats)
68 *
69 * v8 - 17.02.06 - Jean II
70 * o RtNetlink requests support (SET/GET)
71 *
72 * v8b - 03.08.06 - Herbert Xu
73 * o Fix Wireless Event locking issues.
74 *
75 * v9 - 14.3.06 - Jean II
76 * o Change length in ESSID and NICK to strlen() instead of strlen()+1
77 * o Make standard_ioctl_num and standard_event_num unsigned
78 * o Remove (struct net_device *)->get_wireless_stats()
79 */
80
81 /***************************** INCLUDES *****************************/
82
83 #include <linux/module.h>
84 #include <linux/types.h> /* off_t */
85 #include <linux/netdevice.h> /* struct ifreq, dev_get_by_name() */
86 #include <linux/proc_fs.h>
87 #include <linux/rtnetlink.h> /* rtnetlink stuff */
88 #include <linux/seq_file.h>
89 #include <linux/init.h> /* for __init */
90 #include <linux/if_arp.h> /* ARPHRD_ETHER */
91 #include <linux/etherdevice.h> /* compare_ether_addr */
92 #include <linux/interrupt.h>
93
94 #include <linux/wireless.h> /* Pretty obvious */
95 #include <net/iw_handler.h> /* New driver API */
96 #include <net/netlink.h>
97
98 #include <asm/uaccess.h> /* copy_to_user() */
99
100 /**************************** CONSTANTS ****************************/
101
102 /* Debugging stuff */
103 #undef WE_IOCTL_DEBUG /* Debug IOCTL API */
104 #undef WE_RTNETLINK_DEBUG /* Debug RtNetlink API */
105 #undef WE_EVENT_DEBUG /* Debug Event dispatcher */
106 #undef WE_SPY_DEBUG /* Debug enhanced spy support */
107
108 /* Options */
109 //CONFIG_NET_WIRELESS_RTNETLINK /* Wireless requests over RtNetlink */
110 #define WE_EVENT_RTNETLINK /* Propagate events using RtNetlink */
111 #define WE_SET_EVENT /* Generate an event on some set commands */
112
113 /************************* GLOBAL VARIABLES *************************/
114 /*
115 * You should not use global variables, because of re-entrancy.
116 * On our case, it's only const, so it's OK...
117 */
118 /*
119 * Meta-data about all the standard Wireless Extension request we
120 * know about.
121 */
122 static const struct iw_ioctl_description standard_ioctl[] = {
123 [SIOCSIWCOMMIT - SIOCIWFIRST] = {
124 .header_type = IW_HEADER_TYPE_NULL,
125 },
126 [SIOCGIWNAME - SIOCIWFIRST] = {
127 .header_type = IW_HEADER_TYPE_CHAR,
128 .flags = IW_DESCR_FLAG_DUMP,
129 },
130 [SIOCSIWNWID - SIOCIWFIRST] = {
131 .header_type = IW_HEADER_TYPE_PARAM,
132 .flags = IW_DESCR_FLAG_EVENT,
133 },
134 [SIOCGIWNWID - SIOCIWFIRST] = {
135 .header_type = IW_HEADER_TYPE_PARAM,
136 .flags = IW_DESCR_FLAG_DUMP,
137 },
138 [SIOCSIWFREQ - SIOCIWFIRST] = {
139 .header_type = IW_HEADER_TYPE_FREQ,
140 .flags = IW_DESCR_FLAG_EVENT,
141 },
142 [SIOCGIWFREQ - SIOCIWFIRST] = {
143 .header_type = IW_HEADER_TYPE_FREQ,
144 .flags = IW_DESCR_FLAG_DUMP,
145 },
146 [SIOCSIWMODE - SIOCIWFIRST] = {
147 .header_type = IW_HEADER_TYPE_UINT,
148 .flags = IW_DESCR_FLAG_EVENT,
149 },
150 [SIOCGIWMODE - SIOCIWFIRST] = {
151 .header_type = IW_HEADER_TYPE_UINT,
152 .flags = IW_DESCR_FLAG_DUMP,
153 },
154 [SIOCSIWSENS - SIOCIWFIRST] = {
155 .header_type = IW_HEADER_TYPE_PARAM,
156 },
157 [SIOCGIWSENS - SIOCIWFIRST] = {
158 .header_type = IW_HEADER_TYPE_PARAM,
159 },
160 [SIOCSIWRANGE - SIOCIWFIRST] = {
161 .header_type = IW_HEADER_TYPE_NULL,
162 },
163 [SIOCGIWRANGE - SIOCIWFIRST] = {
164 .header_type = IW_HEADER_TYPE_POINT,
165 .token_size = 1,
166 .max_tokens = sizeof(struct iw_range),
167 .flags = IW_DESCR_FLAG_DUMP,
168 },
169 [SIOCSIWPRIV - SIOCIWFIRST] = {
170 .header_type = IW_HEADER_TYPE_NULL,
171 },
172 [SIOCGIWPRIV - SIOCIWFIRST] = { /* (handled directly by us) */
173 .header_type = IW_HEADER_TYPE_POINT,
174 .token_size = sizeof(struct iw_priv_args),
175 .max_tokens = 16,
176 .flags = IW_DESCR_FLAG_NOMAX,
177 },
178 [SIOCSIWSTATS - SIOCIWFIRST] = {
179 .header_type = IW_HEADER_TYPE_NULL,
180 },
181 [SIOCGIWSTATS - SIOCIWFIRST] = { /* (handled directly by us) */
182 .header_type = IW_HEADER_TYPE_POINT,
183 .token_size = 1,
184 .max_tokens = sizeof(struct iw_statistics),
185 .flags = IW_DESCR_FLAG_DUMP,
186 },
187 [SIOCSIWSPY - SIOCIWFIRST] = {
188 .header_type = IW_HEADER_TYPE_POINT,
189 .token_size = sizeof(struct sockaddr),
190 .max_tokens = IW_MAX_SPY,
191 },
192 [SIOCGIWSPY - SIOCIWFIRST] = {
193 .header_type = IW_HEADER_TYPE_POINT,
194 .token_size = sizeof(struct sockaddr) +
195 sizeof(struct iw_quality),
196 .max_tokens = IW_MAX_SPY,
197 },
198 [SIOCSIWTHRSPY - SIOCIWFIRST] = {
199 .header_type = IW_HEADER_TYPE_POINT,
200 .token_size = sizeof(struct iw_thrspy),
201 .min_tokens = 1,
202 .max_tokens = 1,
203 },
204 [SIOCGIWTHRSPY - SIOCIWFIRST] = {
205 .header_type = IW_HEADER_TYPE_POINT,
206 .token_size = sizeof(struct iw_thrspy),
207 .min_tokens = 1,
208 .max_tokens = 1,
209 },
210 [SIOCSIWAP - SIOCIWFIRST] = {
211 .header_type = IW_HEADER_TYPE_ADDR,
212 },
213 [SIOCGIWAP - SIOCIWFIRST] = {
214 .header_type = IW_HEADER_TYPE_ADDR,
215 .flags = IW_DESCR_FLAG_DUMP,
216 },
217 [SIOCSIWMLME - SIOCIWFIRST] = {
218 .header_type = IW_HEADER_TYPE_POINT,
219 .token_size = 1,
220 .min_tokens = sizeof(struct iw_mlme),
221 .max_tokens = sizeof(struct iw_mlme),
222 },
223 [SIOCGIWAPLIST - SIOCIWFIRST] = {
224 .header_type = IW_HEADER_TYPE_POINT,
225 .token_size = sizeof(struct sockaddr) +
226 sizeof(struct iw_quality),
227 .max_tokens = IW_MAX_AP,
228 .flags = IW_DESCR_FLAG_NOMAX,
229 },
230 [SIOCSIWSCAN - SIOCIWFIRST] = {
231 .header_type = IW_HEADER_TYPE_POINT,
232 .token_size = 1,
233 .min_tokens = 0,
234 .max_tokens = sizeof(struct iw_scan_req),
235 },
236 [SIOCGIWSCAN - SIOCIWFIRST] = {
237 .header_type = IW_HEADER_TYPE_POINT,
238 .token_size = 1,
239 .max_tokens = IW_SCAN_MAX_DATA,
240 .flags = IW_DESCR_FLAG_NOMAX,
241 },
242 [SIOCSIWESSID - SIOCIWFIRST] = {
243 .header_type = IW_HEADER_TYPE_POINT,
244 .token_size = 1,
245 .max_tokens = IW_ESSID_MAX_SIZE,
246 .flags = IW_DESCR_FLAG_EVENT,
247 },
248 [SIOCGIWESSID - SIOCIWFIRST] = {
249 .header_type = IW_HEADER_TYPE_POINT,
250 .token_size = 1,
251 .max_tokens = IW_ESSID_MAX_SIZE,
252 .flags = IW_DESCR_FLAG_DUMP,
253 },
254 [SIOCSIWNICKN - SIOCIWFIRST] = {
255 .header_type = IW_HEADER_TYPE_POINT,
256 .token_size = 1,
257 .max_tokens = IW_ESSID_MAX_SIZE,
258 },
259 [SIOCGIWNICKN - SIOCIWFIRST] = {
260 .header_type = IW_HEADER_TYPE_POINT,
261 .token_size = 1,
262 .max_tokens = IW_ESSID_MAX_SIZE,
263 },
264 [SIOCSIWRATE - SIOCIWFIRST] = {
265 .header_type = IW_HEADER_TYPE_PARAM,
266 },
267 [SIOCGIWRATE - SIOCIWFIRST] = {
268 .header_type = IW_HEADER_TYPE_PARAM,
269 },
270 [SIOCSIWRTS - SIOCIWFIRST] = {
271 .header_type = IW_HEADER_TYPE_PARAM,
272 },
273 [SIOCGIWRTS - SIOCIWFIRST] = {
274 .header_type = IW_HEADER_TYPE_PARAM,
275 },
276 [SIOCSIWFRAG - SIOCIWFIRST] = {
277 .header_type = IW_HEADER_TYPE_PARAM,
278 },
279 [SIOCGIWFRAG - SIOCIWFIRST] = {
280 .header_type = IW_HEADER_TYPE_PARAM,
281 },
282 [SIOCSIWTXPOW - SIOCIWFIRST] = {
283 .header_type = IW_HEADER_TYPE_PARAM,
284 },
285 [SIOCGIWTXPOW - SIOCIWFIRST] = {
286 .header_type = IW_HEADER_TYPE_PARAM,
287 },
288 [SIOCSIWRETRY - SIOCIWFIRST] = {
289 .header_type = IW_HEADER_TYPE_PARAM,
290 },
291 [SIOCGIWRETRY - SIOCIWFIRST] = {
292 .header_type = IW_HEADER_TYPE_PARAM,
293 },
294 [SIOCSIWENCODE - SIOCIWFIRST] = {
295 .header_type = IW_HEADER_TYPE_POINT,
296 .token_size = 1,
297 .max_tokens = IW_ENCODING_TOKEN_MAX,
298 .flags = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
299 },
300 [SIOCGIWENCODE - SIOCIWFIRST] = {
301 .header_type = IW_HEADER_TYPE_POINT,
302 .token_size = 1,
303 .max_tokens = IW_ENCODING_TOKEN_MAX,
304 .flags = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
305 },
306 [SIOCSIWPOWER - SIOCIWFIRST] = {
307 .header_type = IW_HEADER_TYPE_PARAM,
308 },
309 [SIOCGIWPOWER - SIOCIWFIRST] = {
310 .header_type = IW_HEADER_TYPE_PARAM,
311 },
312 [SIOCSIWGENIE - SIOCIWFIRST] = {
313 .header_type = IW_HEADER_TYPE_POINT,
314 .token_size = 1,
315 .max_tokens = IW_GENERIC_IE_MAX,
316 },
317 [SIOCGIWGENIE - SIOCIWFIRST] = {
318 .header_type = IW_HEADER_TYPE_POINT,
319 .token_size = 1,
320 .max_tokens = IW_GENERIC_IE_MAX,
321 },
322 [SIOCSIWAUTH - SIOCIWFIRST] = {
323 .header_type = IW_HEADER_TYPE_PARAM,
324 },
325 [SIOCGIWAUTH - SIOCIWFIRST] = {
326 .header_type = IW_HEADER_TYPE_PARAM,
327 },
328 [SIOCSIWENCODEEXT - SIOCIWFIRST] = {
329 .header_type = IW_HEADER_TYPE_POINT,
330 .token_size = 1,
331 .min_tokens = sizeof(struct iw_encode_ext),
332 .max_tokens = sizeof(struct iw_encode_ext) +
333 IW_ENCODING_TOKEN_MAX,
334 },
335 [SIOCGIWENCODEEXT - SIOCIWFIRST] = {
336 .header_type = IW_HEADER_TYPE_POINT,
337 .token_size = 1,
338 .min_tokens = sizeof(struct iw_encode_ext),
339 .max_tokens = sizeof(struct iw_encode_ext) +
340 IW_ENCODING_TOKEN_MAX,
341 },
342 [SIOCSIWPMKSA - SIOCIWFIRST] = {
343 .header_type = IW_HEADER_TYPE_POINT,
344 .token_size = 1,
345 .min_tokens = sizeof(struct iw_pmksa),
346 .max_tokens = sizeof(struct iw_pmksa),
347 },
348 };
349 static const unsigned standard_ioctl_num = (sizeof(standard_ioctl) /
350 sizeof(struct iw_ioctl_description));
351
352 /*
353 * Meta-data about all the additional standard Wireless Extension events
354 * we know about.
355 */
356 static const struct iw_ioctl_description standard_event[] = {
357 [IWEVTXDROP - IWEVFIRST] = {
358 .header_type = IW_HEADER_TYPE_ADDR,
359 },
360 [IWEVQUAL - IWEVFIRST] = {
361 .header_type = IW_HEADER_TYPE_QUAL,
362 },
363 [IWEVCUSTOM - IWEVFIRST] = {
364 .header_type = IW_HEADER_TYPE_POINT,
365 .token_size = 1,
366 .max_tokens = IW_CUSTOM_MAX,
367 },
368 [IWEVREGISTERED - IWEVFIRST] = {
369 .header_type = IW_HEADER_TYPE_ADDR,
370 },
371 [IWEVEXPIRED - IWEVFIRST] = {
372 .header_type = IW_HEADER_TYPE_ADDR,
373 },
374 [IWEVGENIE - IWEVFIRST] = {
375 .header_type = IW_HEADER_TYPE_POINT,
376 .token_size = 1,
377 .max_tokens = IW_GENERIC_IE_MAX,
378 },
379 [IWEVMICHAELMICFAILURE - IWEVFIRST] = {
380 .header_type = IW_HEADER_TYPE_POINT,
381 .token_size = 1,
382 .max_tokens = sizeof(struct iw_michaelmicfailure),
383 },
384 [IWEVASSOCREQIE - IWEVFIRST] = {
385 .header_type = IW_HEADER_TYPE_POINT,
386 .token_size = 1,
387 .max_tokens = IW_GENERIC_IE_MAX,
388 },
389 [IWEVASSOCRESPIE - IWEVFIRST] = {
390 .header_type = IW_HEADER_TYPE_POINT,
391 .token_size = 1,
392 .max_tokens = IW_GENERIC_IE_MAX,
393 },
394 [IWEVPMKIDCAND - IWEVFIRST] = {
395 .header_type = IW_HEADER_TYPE_POINT,
396 .token_size = 1,
397 .max_tokens = sizeof(struct iw_pmkid_cand),
398 },
399 };
400 static const unsigned standard_event_num = (sizeof(standard_event) /
401 sizeof(struct iw_ioctl_description));
402
403 /* Size (in bytes) of the various private data types */
404 static const char iw_priv_type_size[] = {
405 0, /* IW_PRIV_TYPE_NONE */
406 1, /* IW_PRIV_TYPE_BYTE */
407 1, /* IW_PRIV_TYPE_CHAR */
408 0, /* Not defined */
409 sizeof(__u32), /* IW_PRIV_TYPE_INT */
410 sizeof(struct iw_freq), /* IW_PRIV_TYPE_FLOAT */
411 sizeof(struct sockaddr), /* IW_PRIV_TYPE_ADDR */
412 0, /* Not defined */
413 };
414
415 /* Size (in bytes) of various events */
416 static const int event_type_size[] = {
417 IW_EV_LCP_LEN, /* IW_HEADER_TYPE_NULL */
418 0,
419 IW_EV_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
420 0,
421 IW_EV_UINT_LEN, /* IW_HEADER_TYPE_UINT */
422 IW_EV_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
423 IW_EV_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
424 0,
425 IW_EV_POINT_LEN, /* Without variable payload */
426 IW_EV_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
427 IW_EV_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
428 };
429
430 /************************ COMMON SUBROUTINES ************************/
431 /*
432 * Stuff that may be used in various place or doesn't fit in one
433 * of the section below.
434 */
435
436 /* ---------------------------------------------------------------- */
437 /*
438 * Return the driver handler associated with a specific Wireless Extension.
439 * Called from various place, so make sure it remains efficient.
440 */
441 static inline iw_handler get_handler(struct net_device *dev,
442 unsigned int cmd)
443 {
444 /* Don't "optimise" the following variable, it will crash */
445 unsigned int index; /* *MUST* be unsigned */
446
447 /* Check if we have some wireless handlers defined */
448 if(dev->wireless_handlers == NULL)
449 return NULL;
450
451 /* Try as a standard command */
452 index = cmd - SIOCIWFIRST;
453 if(index < dev->wireless_handlers->num_standard)
454 return dev->wireless_handlers->standard[index];
455
456 /* Try as a private command */
457 index = cmd - SIOCIWFIRSTPRIV;
458 if(index < dev->wireless_handlers->num_private)
459 return dev->wireless_handlers->private[index];
460
461 /* Not found */
462 return NULL;
463 }
464
465 /* ---------------------------------------------------------------- */
466 /*
467 * Get statistics out of the driver
468 */
469 static inline struct iw_statistics *get_wireless_stats(struct net_device *dev)
470 {
471 /* New location */
472 if((dev->wireless_handlers != NULL) &&
473 (dev->wireless_handlers->get_wireless_stats != NULL))
474 return dev->wireless_handlers->get_wireless_stats(dev);
475
476 /* Not found */
477 return (struct iw_statistics *) NULL;
478 }
479
480 /* ---------------------------------------------------------------- */
481 /*
482 * Call the commit handler in the driver
483 * (if exist and if conditions are right)
484 *
485 * Note : our current commit strategy is currently pretty dumb,
486 * but we will be able to improve on that...
487 * The goal is to try to agreagate as many changes as possible
488 * before doing the commit. Drivers that will define a commit handler
489 * are usually those that need a reset after changing parameters, so
490 * we want to minimise the number of reset.
491 * A cool idea is to use a timer : at each "set" command, we re-set the
492 * timer, when the timer eventually fires, we call the driver.
493 * Hopefully, more on that later.
494 *
495 * Also, I'm waiting to see how many people will complain about the
496 * netif_running(dev) test. I'm open on that one...
497 * Hopefully, the driver will remember to do a commit in "open()" ;-)
498 */
499 static inline int call_commit_handler(struct net_device * dev)
500 {
501 if((netif_running(dev)) &&
502 (dev->wireless_handlers->standard[0] != NULL)) {
503 /* Call the commit handler on the driver */
504 return dev->wireless_handlers->standard[0](dev, NULL,
505 NULL, NULL);
506 } else
507 return 0; /* Command completed successfully */
508 }
509
510 /* ---------------------------------------------------------------- */
511 /*
512 * Calculate size of private arguments
513 */
514 static inline int get_priv_size(__u16 args)
515 {
516 int num = args & IW_PRIV_SIZE_MASK;
517 int type = (args & IW_PRIV_TYPE_MASK) >> 12;
518
519 return num * iw_priv_type_size[type];
520 }
521
522 /* ---------------------------------------------------------------- */
523 /*
524 * Re-calculate the size of private arguments
525 */
526 static inline int adjust_priv_size(__u16 args,
527 union iwreq_data * wrqu)
528 {
529 int num = wrqu->data.length;
530 int max = args & IW_PRIV_SIZE_MASK;
531 int type = (args & IW_PRIV_TYPE_MASK) >> 12;
532
533 /* Make sure the driver doesn't goof up */
534 if (max < num)
535 num = max;
536
537 return num * iw_priv_type_size[type];
538 }
539
540 /* ---------------------------------------------------------------- */
541 /*
542 * Standard Wireless Handler : get wireless stats
543 * Allow programatic access to /proc/net/wireless even if /proc
544 * doesn't exist... Also more efficient...
545 */
546 static int iw_handler_get_iwstats(struct net_device * dev,
547 struct iw_request_info * info,
548 union iwreq_data * wrqu,
549 char * extra)
550 {
551 /* Get stats from the driver */
552 struct iw_statistics *stats;
553
554 stats = get_wireless_stats(dev);
555 if (stats != (struct iw_statistics *) NULL) {
556
557 /* Copy statistics to extra */
558 memcpy(extra, stats, sizeof(struct iw_statistics));
559 wrqu->data.length = sizeof(struct iw_statistics);
560
561 /* Check if we need to clear the updated flag */
562 if(wrqu->data.flags != 0)
563 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
564 return 0;
565 } else
566 return -EOPNOTSUPP;
567 }
568
569 /* ---------------------------------------------------------------- */
570 /*
571 * Standard Wireless Handler : get iwpriv definitions
572 * Export the driver private handler definition
573 * They will be picked up by tools like iwpriv...
574 */
575 static int iw_handler_get_private(struct net_device * dev,
576 struct iw_request_info * info,
577 union iwreq_data * wrqu,
578 char * extra)
579 {
580 /* Check if the driver has something to export */
581 if((dev->wireless_handlers->num_private_args == 0) ||
582 (dev->wireless_handlers->private_args == NULL))
583 return -EOPNOTSUPP;
584
585 /* Check if there is enough buffer up there */
586 if(wrqu->data.length < dev->wireless_handlers->num_private_args) {
587 /* User space can't know in advance how large the buffer
588 * needs to be. Give it a hint, so that we can support
589 * any size buffer we want somewhat efficiently... */
590 wrqu->data.length = dev->wireless_handlers->num_private_args;
591 return -E2BIG;
592 }
593
594 /* Set the number of available ioctls. */
595 wrqu->data.length = dev->wireless_handlers->num_private_args;
596
597 /* Copy structure to the user buffer. */
598 memcpy(extra, dev->wireless_handlers->private_args,
599 sizeof(struct iw_priv_args) * wrqu->data.length);
600
601 return 0;
602 }
603
604
605 /******************** /proc/net/wireless SUPPORT ********************/
606 /*
607 * The /proc/net/wireless file is a human readable user-space interface
608 * exporting various wireless specific statistics from the wireless devices.
609 * This is the most popular part of the Wireless Extensions ;-)
610 *
611 * This interface is a pure clone of /proc/net/dev (in net/core/dev.c).
612 * The content of the file is basically the content of "struct iw_statistics".
613 */
614
615 #ifdef CONFIG_PROC_FS
616
617 /* ---------------------------------------------------------------- */
618 /*
619 * Print one entry (line) of /proc/net/wireless
620 */
621 static __inline__ void wireless_seq_printf_stats(struct seq_file *seq,
622 struct net_device *dev)
623 {
624 /* Get stats from the driver */
625 struct iw_statistics *stats = get_wireless_stats(dev);
626
627 if (stats) {
628 seq_printf(seq, "%6s: %04x %3d%c %3d%c %3d%c %6d %6d %6d "
629 "%6d %6d %6d\n",
630 dev->name, stats->status, stats->qual.qual,
631 stats->qual.updated & IW_QUAL_QUAL_UPDATED
632 ? '.' : ' ',
633 ((__s32) stats->qual.level) -
634 ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
635 stats->qual.updated & IW_QUAL_LEVEL_UPDATED
636 ? '.' : ' ',
637 ((__s32) stats->qual.noise) -
638 ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
639 stats->qual.updated & IW_QUAL_NOISE_UPDATED
640 ? '.' : ' ',
641 stats->discard.nwid, stats->discard.code,
642 stats->discard.fragment, stats->discard.retries,
643 stats->discard.misc, stats->miss.beacon);
644 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
645 }
646 }
647
648 /* ---------------------------------------------------------------- */
649 /*
650 * Print info for /proc/net/wireless (print all entries)
651 */
652 static int wireless_seq_show(struct seq_file *seq, void *v)
653 {
654 if (v == SEQ_START_TOKEN)
655 seq_printf(seq, "Inter-| sta-| Quality | Discarded "
656 "packets | Missed | WE\n"
657 " face | tus | link level noise | nwid "
658 "crypt frag retry misc | beacon | %d\n",
659 WIRELESS_EXT);
660 else
661 wireless_seq_printf_stats(seq, v);
662 return 0;
663 }
664
665 static struct seq_operations wireless_seq_ops = {
666 .start = dev_seq_start,
667 .next = dev_seq_next,
668 .stop = dev_seq_stop,
669 .show = wireless_seq_show,
670 };
671
672 static int wireless_seq_open(struct inode *inode, struct file *file)
673 {
674 return seq_open(file, &wireless_seq_ops);
675 }
676
677 static struct file_operations wireless_seq_fops = {
678 .owner = THIS_MODULE,
679 .open = wireless_seq_open,
680 .read = seq_read,
681 .llseek = seq_lseek,
682 .release = seq_release,
683 };
684
685 int __init wireless_proc_init(void)
686 {
687 /* Create /proc/net/wireless entry */
688 if (!proc_net_fops_create("wireless", S_IRUGO, &wireless_seq_fops))
689 return -ENOMEM;
690
691 return 0;
692 }
693 #endif /* CONFIG_PROC_FS */
694
695 /************************** IOCTL SUPPORT **************************/
696 /*
697 * The original user space API to configure all those Wireless Extensions
698 * is through IOCTLs.
699 * In there, we check if we need to call the new driver API (iw_handler)
700 * or just call the driver ioctl handler.
701 */
702
703 /* ---------------------------------------------------------------- */
704 /*
705 * Wrapper to call a standard Wireless Extension handler.
706 * We do various checks and also take care of moving data between
707 * user space and kernel space.
708 */
709 static int ioctl_standard_call(struct net_device * dev,
710 struct ifreq * ifr,
711 unsigned int cmd,
712 iw_handler handler)
713 {
714 struct iwreq * iwr = (struct iwreq *) ifr;
715 const struct iw_ioctl_description * descr;
716 struct iw_request_info info;
717 int ret = -EINVAL;
718
719 /* Get the description of the IOCTL */
720 if((cmd - SIOCIWFIRST) >= standard_ioctl_num)
721 return -EOPNOTSUPP;
722 descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
723
724 #ifdef WE_IOCTL_DEBUG
725 printk(KERN_DEBUG "%s (WE) : Found standard handler for 0x%04X\n",
726 ifr->ifr_name, cmd);
727 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);
728 #endif /* WE_IOCTL_DEBUG */
729
730 /* Prepare the call */
731 info.cmd = cmd;
732 info.flags = 0;
733
734 /* Check if we have a pointer to user space data or not */
735 if(descr->header_type != IW_HEADER_TYPE_POINT) {
736
737 /* No extra arguments. Trivial to handle */
738 ret = handler(dev, &info, &(iwr->u), NULL);
739
740 #ifdef WE_SET_EVENT
741 /* Generate an event to notify listeners of the change */
742 if((descr->flags & IW_DESCR_FLAG_EVENT) &&
743 ((ret == 0) || (ret == -EIWCOMMIT)))
744 wireless_send_event(dev, cmd, &(iwr->u), NULL);
745 #endif /* WE_SET_EVENT */
746 } else {
747 char * extra;
748 int extra_size;
749 int user_length = 0;
750 int err;
751 int essid_compat = 0;
752
753 /* Calculate space needed by arguments. Always allocate
754 * for max space. Easier, and won't last long... */
755 extra_size = descr->max_tokens * descr->token_size;
756
757 /* Check need for ESSID compatibility for WE < 21 */
758 switch (cmd) {
759 case SIOCSIWESSID:
760 case SIOCGIWESSID:
761 case SIOCSIWNICKN:
762 case SIOCGIWNICKN:
763 if (iwr->u.data.length == descr->max_tokens + 1)
764 essid_compat = 1;
765 else if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
766 char essid[IW_ESSID_MAX_SIZE + 1];
767
768 err = copy_from_user(essid, iwr->u.data.pointer,
769 iwr->u.data.length *
770 descr->token_size);
771 if (err)
772 return -EFAULT;
773
774 if (essid[iwr->u.data.length - 1] == '\0')
775 essid_compat = 1;
776 }
777 break;
778 default:
779 break;
780 }
781
782 iwr->u.data.length -= essid_compat;
783
784 /* Check what user space is giving us */
785 if(IW_IS_SET(cmd)) {
786 /* Check NULL pointer */
787 if((iwr->u.data.pointer == NULL) &&
788 (iwr->u.data.length != 0))
789 return -EFAULT;
790 /* Check if number of token fits within bounds */
791 if(iwr->u.data.length > descr->max_tokens)
792 return -E2BIG;
793 if(iwr->u.data.length < descr->min_tokens)
794 return -EINVAL;
795 } else {
796 /* Check NULL pointer */
797 if(iwr->u.data.pointer == NULL)
798 return -EFAULT;
799 /* Save user space buffer size for checking */
800 user_length = iwr->u.data.length;
801
802 /* Don't check if user_length > max to allow forward
803 * compatibility. The test user_length < min is
804 * implied by the test at the end. */
805
806 /* Support for very large requests */
807 if((descr->flags & IW_DESCR_FLAG_NOMAX) &&
808 (user_length > descr->max_tokens)) {
809 /* Allow userspace to GET more than max so
810 * we can support any size GET requests.
811 * There is still a limit : -ENOMEM. */
812 extra_size = user_length * descr->token_size;
813 /* Note : user_length is originally a __u16,
814 * and token_size is controlled by us,
815 * so extra_size won't get negative and
816 * won't overflow... */
817 }
818 }
819
820 #ifdef WE_IOCTL_DEBUG
821 printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n",
822 dev->name, extra_size);
823 #endif /* WE_IOCTL_DEBUG */
824
825 /* Create the kernel buffer */
826 /* kzalloc ensures NULL-termination for essid_compat */
827 extra = kzalloc(extra_size, GFP_KERNEL);
828 if (extra == NULL) {
829 return -ENOMEM;
830 }
831
832 /* If it is a SET, get all the extra data in here */
833 if(IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
834 err = copy_from_user(extra, iwr->u.data.pointer,
835 iwr->u.data.length *
836 descr->token_size);
837 if (err) {
838 kfree(extra);
839 return -EFAULT;
840 }
841 #ifdef WE_IOCTL_DEBUG
842 printk(KERN_DEBUG "%s (WE) : Got %d bytes\n",
843 dev->name,
844 iwr->u.data.length * descr->token_size);
845 #endif /* WE_IOCTL_DEBUG */
846 }
847
848 /* Call the handler */
849 ret = handler(dev, &info, &(iwr->u), extra);
850
851 iwr->u.data.length += essid_compat;
852
853 /* If we have something to return to the user */
854 if (!ret && IW_IS_GET(cmd)) {
855 /* Check if there is enough buffer up there */
856 if(user_length < iwr->u.data.length) {
857 kfree(extra);
858 return -E2BIG;
859 }
860
861 err = copy_to_user(iwr->u.data.pointer, extra,
862 iwr->u.data.length *
863 descr->token_size);
864 if (err)
865 ret = -EFAULT;
866 #ifdef WE_IOCTL_DEBUG
867 printk(KERN_DEBUG "%s (WE) : Wrote %d bytes\n",
868 dev->name,
869 iwr->u.data.length * descr->token_size);
870 #endif /* WE_IOCTL_DEBUG */
871 }
872
873 #ifdef WE_SET_EVENT
874 /* Generate an event to notify listeners of the change */
875 if((descr->flags & IW_DESCR_FLAG_EVENT) &&
876 ((ret == 0) || (ret == -EIWCOMMIT))) {
877 if(descr->flags & IW_DESCR_FLAG_RESTRICT)
878 /* If the event is restricted, don't
879 * export the payload */
880 wireless_send_event(dev, cmd, &(iwr->u), NULL);
881 else
882 wireless_send_event(dev, cmd, &(iwr->u),
883 extra);
884 }
885 #endif /* WE_SET_EVENT */
886
887 /* Cleanup - I told you it wasn't that long ;-) */
888 kfree(extra);
889 }
890
891 /* Call commit handler if needed and defined */
892 if(ret == -EIWCOMMIT)
893 ret = call_commit_handler(dev);
894
895 /* Here, we will generate the appropriate event if needed */
896
897 return ret;
898 }
899
900 /* ---------------------------------------------------------------- */
901 /*
902 * Wrapper to call a private Wireless Extension handler.
903 * We do various checks and also take care of moving data between
904 * user space and kernel space.
905 * It's not as nice and slimline as the standard wrapper. The cause
906 * is struct iw_priv_args, which was not really designed for the
907 * job we are going here.
908 *
909 * IMPORTANT : This function prevent to set and get data on the same
910 * IOCTL and enforce the SET/GET convention. Not doing it would be
911 * far too hairy...
912 * If you need to set and get data at the same time, please don't use
913 * a iw_handler but process it in your ioctl handler (i.e. use the
914 * old driver API).
915 */
916 static inline int ioctl_private_call(struct net_device * dev,
917 struct ifreq * ifr,
918 unsigned int cmd,
919 iw_handler handler)
920 {
921 struct iwreq * iwr = (struct iwreq *) ifr;
922 const struct iw_priv_args * descr = NULL;
923 struct iw_request_info info;
924 int extra_size = 0;
925 int i;
926 int ret = -EINVAL;
927
928 /* Get the description of the IOCTL */
929 for(i = 0; i < dev->wireless_handlers->num_private_args; i++)
930 if(cmd == dev->wireless_handlers->private_args[i].cmd) {
931 descr = &(dev->wireless_handlers->private_args[i]);
932 break;
933 }
934
935 #ifdef WE_IOCTL_DEBUG
936 printk(KERN_DEBUG "%s (WE) : Found private handler for 0x%04X\n",
937 ifr->ifr_name, cmd);
938 if(descr) {
939 printk(KERN_DEBUG "%s (WE) : Name %s, set %X, get %X\n",
940 dev->name, descr->name,
941 descr->set_args, descr->get_args);
942 }
943 #endif /* WE_IOCTL_DEBUG */
944
945 /* Compute the size of the set/get arguments */
946 if(descr != NULL) {
947 if(IW_IS_SET(cmd)) {
948 int offset = 0; /* For sub-ioctls */
949 /* Check for sub-ioctl handler */
950 if(descr->name[0] == '\0')
951 /* Reserve one int for sub-ioctl index */
952 offset = sizeof(__u32);
953
954 /* Size of set arguments */
955 extra_size = get_priv_size(descr->set_args);
956
957 /* Does it fits in iwr ? */
958 if((descr->set_args & IW_PRIV_SIZE_FIXED) &&
959 ((extra_size + offset) <= IFNAMSIZ))
960 extra_size = 0;
961 } else {
962 /* Size of get arguments */
963 extra_size = get_priv_size(descr->get_args);
964
965 /* Does it fits in iwr ? */
966 if((descr->get_args & IW_PRIV_SIZE_FIXED) &&
967 (extra_size <= IFNAMSIZ))
968 extra_size = 0;
969 }
970 }
971
972 /* Prepare the call */
973 info.cmd = cmd;
974 info.flags = 0;
975
976 /* Check if we have a pointer to user space data or not. */
977 if(extra_size == 0) {
978 /* No extra arguments. Trivial to handle */
979 ret = handler(dev, &info, &(iwr->u), (char *) &(iwr->u));
980 } else {
981 char * extra;
982 int err;
983
984 /* Check what user space is giving us */
985 if(IW_IS_SET(cmd)) {
986 /* Check NULL pointer */
987 if((iwr->u.data.pointer == NULL) &&
988 (iwr->u.data.length != 0))
989 return -EFAULT;
990
991 /* Does it fits within bounds ? */
992 if(iwr->u.data.length > (descr->set_args &
993 IW_PRIV_SIZE_MASK))
994 return -E2BIG;
995 } else {
996 /* Check NULL pointer */
997 if(iwr->u.data.pointer == NULL)
998 return -EFAULT;
999 }
1000
1001 #ifdef WE_IOCTL_DEBUG
1002 printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n",
1003 dev->name, extra_size);
1004 #endif /* WE_IOCTL_DEBUG */
1005
1006 /* Always allocate for max space. Easier, and won't last
1007 * long... */
1008 extra = kmalloc(extra_size, GFP_KERNEL);
1009 if (extra == NULL) {
1010 return -ENOMEM;
1011 }
1012
1013 /* If it is a SET, get all the extra data in here */
1014 if(IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
1015 err = copy_from_user(extra, iwr->u.data.pointer,
1016 extra_size);
1017 if (err) {
1018 kfree(extra);
1019 return -EFAULT;
1020 }
1021 #ifdef WE_IOCTL_DEBUG
1022 printk(KERN_DEBUG "%s (WE) : Got %d elem\n",
1023 dev->name, iwr->u.data.length);
1024 #endif /* WE_IOCTL_DEBUG */
1025 }
1026
1027 /* Call the handler */
1028 ret = handler(dev, &info, &(iwr->u), extra);
1029
1030 /* If we have something to return to the user */
1031 if (!ret && IW_IS_GET(cmd)) {
1032
1033 /* Adjust for the actual length if it's variable,
1034 * avoid leaking kernel bits outside. */
1035 if (!(descr->get_args & IW_PRIV_SIZE_FIXED)) {
1036 extra_size = adjust_priv_size(descr->get_args,
1037 &(iwr->u));
1038 }
1039
1040 err = copy_to_user(iwr->u.data.pointer, extra,
1041 extra_size);
1042 if (err)
1043 ret = -EFAULT;
1044 #ifdef WE_IOCTL_DEBUG
1045 printk(KERN_DEBUG "%s (WE) : Wrote %d elem\n",
1046 dev->name, iwr->u.data.length);
1047 #endif /* WE_IOCTL_DEBUG */
1048 }
1049
1050 /* Cleanup - I told you it wasn't that long ;-) */
1051 kfree(extra);
1052 }
1053
1054
1055 /* Call commit handler if needed and defined */
1056 if(ret == -EIWCOMMIT)
1057 ret = call_commit_handler(dev);
1058
1059 return ret;
1060 }
1061
1062 /* ---------------------------------------------------------------- */
1063 /*
1064 * Main IOCTl dispatcher. Called from the main networking code
1065 * (dev_ioctl() in net/core/dev.c).
1066 * Check the type of IOCTL and call the appropriate wrapper...
1067 */
1068 int wireless_process_ioctl(struct ifreq *ifr, unsigned int cmd)
1069 {
1070 struct net_device *dev;
1071 iw_handler handler;
1072
1073 /* Permissions are already checked in dev_ioctl() before calling us.
1074 * The copy_to/from_user() of ifr is also dealt with in there */
1075
1076 /* Make sure the device exist */
1077 if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL)
1078 return -ENODEV;
1079
1080 /* A bunch of special cases, then the generic case...
1081 * Note that 'cmd' is already filtered in dev_ioctl() with
1082 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
1083 switch(cmd)
1084 {
1085 case SIOCGIWSTATS:
1086 /* Get Wireless Stats */
1087 return ioctl_standard_call(dev,
1088 ifr,
1089 cmd,
1090 &iw_handler_get_iwstats);
1091
1092 case SIOCGIWPRIV:
1093 /* Check if we have some wireless handlers defined */
1094 if(dev->wireless_handlers != NULL) {
1095 /* We export to user space the definition of
1096 * the private handler ourselves */
1097 return ioctl_standard_call(dev,
1098 ifr,
1099 cmd,
1100 &iw_handler_get_private);
1101 }
1102 // ## Fall-through for old API ##
1103 default:
1104 /* Generic IOCTL */
1105 /* Basic check */
1106 if (!netif_device_present(dev))
1107 return -ENODEV;
1108 /* New driver API : try to find the handler */
1109 handler = get_handler(dev, cmd);
1110 if(handler != NULL) {
1111 /* Standard and private are not the same */
1112 if(cmd < SIOCIWFIRSTPRIV)
1113 return ioctl_standard_call(dev,
1114 ifr,
1115 cmd,
1116 handler);
1117 else
1118 return ioctl_private_call(dev,
1119 ifr,
1120 cmd,
1121 handler);
1122 }
1123 /* Old driver API : call driver ioctl handler */
1124 if (dev->do_ioctl) {
1125 return dev->do_ioctl(dev, ifr, cmd);
1126 }
1127 return -EOPNOTSUPP;
1128 }
1129 /* Not reached */
1130 return -EINVAL;
1131 }
1132
1133 /********************** RTNETLINK REQUEST API **********************/
1134 /*
1135 * The alternate user space API to configure all those Wireless Extensions
1136 * is through RtNetlink.
1137 * This API support only the new driver API (iw_handler).
1138 *
1139 * This RtNetlink API use the same query/reply model as the ioctl API.
1140 * Maximum effort has been done to fit in the RtNetlink model, and
1141 * we support both RtNetlink Set and RtNelink Get operations.
1142 * On the other hand, we don't offer Dump operations because of the
1143 * following reasons :
1144 * o Large number of parameters, most optional
1145 * o Large size of some parameters (> 100 bytes)
1146 * o Each parameters need to be extracted from hardware
1147 * o Scan requests can take seconds and disable network activity.
1148 * Because of this high cost/overhead, we want to return only the
1149 * parameters the user application is really interested in.
1150 * We could offer partial Dump using the IW_DESCR_FLAG_DUMP flag.
1151 *
1152 * The API uses the standard RtNetlink socket. When the RtNetlink code
1153 * find a IFLA_WIRELESS field in a RtNetlink SET_LINK request,
1154 * it calls here.
1155 */
1156
1157 #ifdef CONFIG_NET_WIRELESS_RTNETLINK
1158 /* ---------------------------------------------------------------- */
1159 /*
1160 * Wrapper to call a standard Wireless Extension GET handler.
1161 * We do various checks and call the handler with the proper args.
1162 */
1163 static int rtnetlink_standard_get(struct net_device * dev,
1164 struct iw_event * request,
1165 int request_len,
1166 iw_handler handler,
1167 char ** p_buf,
1168 int * p_len)
1169 {
1170 const struct iw_ioctl_description * descr = NULL;
1171 unsigned int cmd;
1172 union iwreq_data * wrqu;
1173 int hdr_len;
1174 struct iw_request_info info;
1175 char * buffer = NULL;
1176 int buffer_size = 0;
1177 int ret = -EINVAL;
1178
1179 /* Get the description of the Request */
1180 cmd = request->cmd;
1181 if((cmd - SIOCIWFIRST) >= standard_ioctl_num)
1182 return -EOPNOTSUPP;
1183 descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
1184
1185 #ifdef WE_RTNETLINK_DEBUG
1186 printk(KERN_DEBUG "%s (WE.r) : Found standard handler for 0x%04X\n",
1187 dev->name, cmd);
1188 printk(KERN_DEBUG "%s (WE.r) : 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);
1189 #endif /* WE_RTNETLINK_DEBUG */
1190
1191 /* Check if wrqu is complete */
1192 hdr_len = event_type_size[descr->header_type];
1193 if(request_len < hdr_len) {
1194 #ifdef WE_RTNETLINK_DEBUG
1195 printk(KERN_DEBUG
1196 "%s (WE.r) : Wireless request too short (%d)\n",
1197 dev->name, request_len);
1198 #endif /* WE_RTNETLINK_DEBUG */
1199 return -EINVAL;
1200 }
1201
1202 /* Prepare the call */
1203 info.cmd = cmd;
1204 info.flags = 0;
1205
1206 /* Check if we have extra data in the reply or not */
1207 if(descr->header_type != IW_HEADER_TYPE_POINT) {
1208
1209 /* Create the kernel buffer that we will return.
1210 * It's at an offset to match the TYPE_POINT case... */
1211 buffer_size = request_len + IW_EV_POINT_OFF;
1212 buffer = kmalloc(buffer_size, GFP_KERNEL);
1213 if (buffer == NULL) {
1214 return -ENOMEM;
1215 }
1216 /* Copy event data */
1217 memcpy(buffer + IW_EV_POINT_OFF, request, request_len);
1218 /* Use our own copy of wrqu */
1219 wrqu = (union iwreq_data *) (buffer + IW_EV_POINT_OFF
1220 + IW_EV_LCP_LEN);
1221
1222 /* No extra arguments. Trivial to handle */
1223 ret = handler(dev, &info, wrqu, NULL);
1224
1225 } else {
1226 union iwreq_data wrqu_point;
1227 char * extra = NULL;
1228 int extra_size = 0;
1229
1230 /* Get a temp copy of wrqu (skip pointer) */
1231 memcpy(((char *) &wrqu_point) + IW_EV_POINT_OFF,
1232 ((char *) request) + IW_EV_LCP_LEN,
1233 IW_EV_POINT_LEN - IW_EV_LCP_LEN);
1234
1235 /* Calculate space needed by arguments. Always allocate
1236 * for max space. Easier, and won't last long... */
1237 extra_size = descr->max_tokens * descr->token_size;
1238 /* Support for very large requests */
1239 if((descr->flags & IW_DESCR_FLAG_NOMAX) &&
1240 (wrqu_point.data.length > descr->max_tokens))
1241 extra_size = (wrqu_point.data.length
1242 * descr->token_size);
1243 buffer_size = extra_size + IW_EV_POINT_LEN + IW_EV_POINT_OFF;
1244 #ifdef WE_RTNETLINK_DEBUG
1245 printk(KERN_DEBUG "%s (WE.r) : Malloc %d bytes (%d bytes)\n",
1246 dev->name, extra_size, buffer_size);
1247 #endif /* WE_RTNETLINK_DEBUG */
1248
1249 /* Create the kernel buffer that we will return */
1250 buffer = kmalloc(buffer_size, GFP_KERNEL);
1251 if (buffer == NULL) {
1252 return -ENOMEM;
1253 }
1254
1255 /* Put wrqu in the right place (just before extra).
1256 * Leave space for IWE header and dummy pointer...
1257 * Note that IW_EV_LCP_LEN==4 bytes, so it's still aligned...
1258 */
1259 memcpy(buffer + IW_EV_LCP_LEN + IW_EV_POINT_OFF,
1260 ((char *) &wrqu_point) + IW_EV_POINT_OFF,
1261 IW_EV_POINT_LEN - IW_EV_LCP_LEN);
1262 wrqu = (union iwreq_data *) (buffer + IW_EV_LCP_LEN);
1263
1264 /* Extra comes logically after that. Offset +12 bytes. */
1265 extra = buffer + IW_EV_POINT_OFF + IW_EV_POINT_LEN;
1266
1267 /* Call the handler */
1268 ret = handler(dev, &info, wrqu, extra);
1269
1270 /* Calculate real returned length */
1271 extra_size = (wrqu->data.length * descr->token_size);
1272 /* Re-adjust reply size */
1273 request->len = extra_size + IW_EV_POINT_LEN;
1274
1275 /* Put the iwe header where it should, i.e. scrap the
1276 * dummy pointer. */
1277 memcpy(buffer + IW_EV_POINT_OFF, request, IW_EV_LCP_LEN);
1278
1279 #ifdef WE_RTNETLINK_DEBUG
1280 printk(KERN_DEBUG "%s (WE.r) : Reply 0x%04X, hdr_len %d, tokens %d, extra_size %d, buffer_size %d\n", dev->name, cmd, hdr_len, wrqu->data.length, extra_size, buffer_size);
1281 #endif /* WE_RTNETLINK_DEBUG */
1282
1283 /* Check if there is enough buffer up there */
1284 if(wrqu_point.data.length < wrqu->data.length)
1285 ret = -E2BIG;
1286 }
1287
1288 /* Return the buffer to the caller */
1289 if (!ret) {
1290 *p_buf = buffer;
1291 *p_len = request->len;
1292 } else {
1293 /* Cleanup */
1294 if(buffer)
1295 kfree(buffer);
1296 }
1297
1298 return ret;
1299 }
1300
1301 /* ---------------------------------------------------------------- */
1302 /*
1303 * Wrapper to call a standard Wireless Extension SET handler.
1304 * We do various checks and call the handler with the proper args.
1305 */
1306 static inline int rtnetlink_standard_set(struct net_device * dev,
1307 struct iw_event * request,
1308 int request_len,
1309 iw_handler handler)
1310 {
1311 const struct iw_ioctl_description * descr = NULL;
1312 unsigned int cmd;
1313 union iwreq_data * wrqu;
1314 union iwreq_data wrqu_point;
1315 int hdr_len;
1316 char * extra = NULL;
1317 int extra_size = 0;
1318 struct iw_request_info info;
1319 int ret = -EINVAL;
1320
1321 /* Get the description of the Request */
1322 cmd = request->cmd;
1323 if((cmd - SIOCIWFIRST) >= standard_ioctl_num)
1324 return -EOPNOTSUPP;
1325 descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
1326
1327 #ifdef WE_RTNETLINK_DEBUG
1328 printk(KERN_DEBUG "%s (WE.r) : Found standard SET handler for 0x%04X\n",
1329 dev->name, cmd);
1330 printk(KERN_DEBUG "%s (WE.r) : 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);
1331 #endif /* WE_RTNETLINK_DEBUG */
1332
1333 /* Extract fixed header from request. This is properly aligned. */
1334 wrqu = &request->u;
1335
1336 /* Check if wrqu is complete */
1337 hdr_len = event_type_size[descr->header_type];
1338 if(request_len < hdr_len) {
1339 #ifdef WE_RTNETLINK_DEBUG
1340 printk(KERN_DEBUG
1341 "%s (WE.r) : Wireless request too short (%d)\n",
1342 dev->name, request_len);
1343 #endif /* WE_RTNETLINK_DEBUG */
1344 return -EINVAL;
1345 }
1346
1347 /* Prepare the call */
1348 info.cmd = cmd;
1349 info.flags = 0;
1350
1351 /* Check if we have extra data in the request or not */
1352 if(descr->header_type != IW_HEADER_TYPE_POINT) {
1353
1354 /* No extra arguments. Trivial to handle */
1355 ret = handler(dev, &info, wrqu, NULL);
1356
1357 } else {
1358 int extra_len;
1359
1360 /* Put wrqu in the right place (skip pointer) */
1361 memcpy(((char *) &wrqu_point) + IW_EV_POINT_OFF,
1362 wrqu, IW_EV_POINT_LEN - IW_EV_LCP_LEN);
1363 /* Don't forget about the event code... */
1364 wrqu = &wrqu_point;
1365
1366 /* Check if number of token fits within bounds */
1367 if(wrqu_point.data.length > descr->max_tokens)
1368 return -E2BIG;
1369 if(wrqu_point.data.length < descr->min_tokens)
1370 return -EINVAL;
1371
1372 /* Real length of payload */
1373 extra_len = wrqu_point.data.length * descr->token_size;
1374
1375 /* Check if request is self consistent */
1376 if((request_len - hdr_len) < extra_len) {
1377 #ifdef WE_RTNETLINK_DEBUG
1378 printk(KERN_DEBUG "%s (WE.r) : Wireless request data too short (%d)\n",
1379 dev->name, extra_size);
1380 #endif /* WE_RTNETLINK_DEBUG */
1381 return -EINVAL;
1382 }
1383
1384 #ifdef WE_RTNETLINK_DEBUG
1385 printk(KERN_DEBUG "%s (WE.r) : Malloc %d bytes\n",
1386 dev->name, extra_size);
1387 #endif /* WE_RTNETLINK_DEBUG */
1388
1389 /* Always allocate for max space. Easier, and won't last
1390 * long... */
1391 extra_size = descr->max_tokens * descr->token_size;
1392 extra = kmalloc(extra_size, GFP_KERNEL);
1393 if (extra == NULL)
1394 return -ENOMEM;
1395
1396 /* Copy extra in aligned buffer */
1397 memcpy(extra, ((char *) request) + hdr_len, extra_len);
1398
1399 /* Call the handler */
1400 ret = handler(dev, &info, &wrqu_point, extra);
1401 }
1402
1403 #ifdef WE_SET_EVENT
1404 /* Generate an event to notify listeners of the change */
1405 if((descr->flags & IW_DESCR_FLAG_EVENT) &&
1406 ((ret == 0) || (ret == -EIWCOMMIT))) {
1407 if(descr->flags & IW_DESCR_FLAG_RESTRICT)
1408 /* If the event is restricted, don't
1409 * export the payload */
1410 wireless_send_event(dev, cmd, wrqu, NULL);
1411 else
1412 wireless_send_event(dev, cmd, wrqu, extra);
1413 }
1414 #endif /* WE_SET_EVENT */
1415
1416 /* Cleanup - I told you it wasn't that long ;-) */
1417 if(extra)
1418 kfree(extra);
1419
1420 /* Call commit handler if needed and defined */
1421 if(ret == -EIWCOMMIT)
1422 ret = call_commit_handler(dev);
1423
1424 return ret;
1425 }
1426
1427 /* ---------------------------------------------------------------- */
1428 /*
1429 * Wrapper to call a private Wireless Extension GET handler.
1430 * Same as above...
1431 * It's not as nice and slimline as the standard wrapper. The cause
1432 * is struct iw_priv_args, which was not really designed for the
1433 * job we are going here.
1434 *
1435 * IMPORTANT : This function prevent to set and get data on the same
1436 * IOCTL and enforce the SET/GET convention. Not doing it would be
1437 * far too hairy...
1438 * If you need to set and get data at the same time, please don't use
1439 * a iw_handler but process it in your ioctl handler (i.e. use the
1440 * old driver API).
1441 */
1442 static inline int rtnetlink_private_get(struct net_device * dev,
1443 struct iw_event * request,
1444 int request_len,
1445 iw_handler handler,
1446 char ** p_buf,
1447 int * p_len)
1448 {
1449 const struct iw_priv_args * descr = NULL;
1450 unsigned int cmd;
1451 union iwreq_data * wrqu;
1452 int hdr_len;
1453 struct iw_request_info info;
1454 int extra_size = 0;
1455 int i;
1456 char * buffer = NULL;
1457 int buffer_size = 0;
1458 int ret = -EINVAL;
1459
1460 /* Get the description of the Request */
1461 cmd = request->cmd;
1462 for(i = 0; i < dev->wireless_handlers->num_private_args; i++)
1463 if(cmd == dev->wireless_handlers->private_args[i].cmd) {
1464 descr = &(dev->wireless_handlers->private_args[i]);
1465 break;
1466 }
1467 if(descr == NULL)
1468 return -EOPNOTSUPP;
1469
1470 #ifdef WE_RTNETLINK_DEBUG
1471 printk(KERN_DEBUG "%s (WE.r) : Found private handler for 0x%04X\n",
1472 dev->name, cmd);
1473 printk(KERN_DEBUG "%s (WE.r) : Name %s, set %X, get %X\n",
1474 dev->name, descr->name, descr->set_args, descr->get_args);
1475 #endif /* WE_RTNETLINK_DEBUG */
1476
1477 /* Compute the max size of the get arguments */
1478 extra_size = get_priv_size(descr->get_args);
1479
1480 /* Does it fits in wrqu ? */
1481 if((descr->get_args & IW_PRIV_SIZE_FIXED) &&
1482 (extra_size <= IFNAMSIZ)) {
1483 hdr_len = extra_size;
1484 extra_size = 0;
1485 } else {
1486 hdr_len = IW_EV_POINT_LEN;
1487 }
1488
1489 /* Check if wrqu is complete */
1490 if(request_len < hdr_len) {
1491 #ifdef WE_RTNETLINK_DEBUG
1492 printk(KERN_DEBUG
1493 "%s (WE.r) : Wireless request too short (%d)\n",
1494 dev->name, request_len);
1495 #endif /* WE_RTNETLINK_DEBUG */
1496 return -EINVAL;
1497 }
1498
1499 /* Prepare the call */
1500 info.cmd = cmd;
1501 info.flags = 0;
1502
1503 /* Check if we have a pointer to user space data or not. */
1504 if(extra_size == 0) {
1505
1506 /* Create the kernel buffer that we will return.
1507 * It's at an offset to match the TYPE_POINT case... */
1508 buffer_size = request_len + IW_EV_POINT_OFF;
1509 buffer = kmalloc(buffer_size, GFP_KERNEL);
1510 if (buffer == NULL) {
1511 return -ENOMEM;
1512 }
1513 /* Copy event data */
1514 memcpy(buffer + IW_EV_POINT_OFF, request, request_len);
1515 /* Use our own copy of wrqu */
1516 wrqu = (union iwreq_data *) (buffer + IW_EV_POINT_OFF
1517 + IW_EV_LCP_LEN);
1518
1519 /* No extra arguments. Trivial to handle */
1520 ret = handler(dev, &info, wrqu, (char *) wrqu);
1521
1522 } else {
1523 char * extra;
1524
1525 /* Buffer for full reply */
1526 buffer_size = extra_size + IW_EV_POINT_LEN + IW_EV_POINT_OFF;
1527
1528 #ifdef WE_RTNETLINK_DEBUG
1529 printk(KERN_DEBUG "%s (WE.r) : Malloc %d bytes (%d bytes)\n",
1530 dev->name, extra_size, buffer_size);
1531 #endif /* WE_RTNETLINK_DEBUG */
1532
1533 /* Create the kernel buffer that we will return */
1534 buffer = kmalloc(buffer_size, GFP_KERNEL);
1535 if (buffer == NULL) {
1536 return -ENOMEM;
1537 }
1538
1539 /* Put wrqu in the right place (just before extra).
1540 * Leave space for IWE header and dummy pointer...
1541 * Note that IW_EV_LCP_LEN==4 bytes, so it's still aligned...
1542 */
1543 memcpy(buffer + IW_EV_LCP_LEN + IW_EV_POINT_OFF,
1544 ((char *) request) + IW_EV_LCP_LEN,
1545 IW_EV_POINT_LEN - IW_EV_LCP_LEN);
1546 wrqu = (union iwreq_data *) (buffer + IW_EV_LCP_LEN);
1547
1548 /* Extra comes logically after that. Offset +12 bytes. */
1549 extra = buffer + IW_EV_POINT_OFF + IW_EV_POINT_LEN;
1550
1551 /* Call the handler */
1552 ret = handler(dev, &info, wrqu, extra);
1553
1554 /* Adjust for the actual length if it's variable,
1555 * avoid leaking kernel bits outside. */
1556 if (!(descr->get_args & IW_PRIV_SIZE_FIXED))
1557 extra_size = adjust_priv_size(descr->get_args, wrqu);
1558 /* Re-adjust reply size */
1559 request->len = extra_size + IW_EV_POINT_LEN;
1560
1561 /* Put the iwe header where it should, i.e. scrap the
1562 * dummy pointer. */
1563 memcpy(buffer + IW_EV_POINT_OFF, request, IW_EV_LCP_LEN);
1564
1565 #ifdef WE_RTNETLINK_DEBUG
1566 printk(KERN_DEBUG "%s (WE.r) : Reply 0x%04X, hdr_len %d, tokens %d, extra_size %d, buffer_size %d\n", dev->name, cmd, hdr_len, wrqu->data.length, extra_size, buffer_size);
1567 #endif /* WE_RTNETLINK_DEBUG */
1568 }
1569
1570 /* Return the buffer to the caller */
1571 if (!ret) {
1572 *p_buf = buffer;
1573 *p_len = request->len;
1574 } else {
1575 /* Cleanup */
1576 if(buffer)
1577 kfree(buffer);
1578 }
1579
1580 return ret;
1581 }
1582
1583 /* ---------------------------------------------------------------- */
1584 /*
1585 * Wrapper to call a private Wireless Extension SET handler.
1586 * Same as above...
1587 * It's not as nice and slimline as the standard wrapper. The cause
1588 * is struct iw_priv_args, which was not really designed for the
1589 * job we are going here.
1590 *
1591 * IMPORTANT : This function prevent to set and get data on the same
1592 * IOCTL and enforce the SET/GET convention. Not doing it would be
1593 * far too hairy...
1594 * If you need to set and get data at the same time, please don't use
1595 * a iw_handler but process it in your ioctl handler (i.e. use the
1596 * old driver API).
1597 */
1598 static inline int rtnetlink_private_set(struct net_device * dev,
1599 struct iw_event * request,
1600 int request_len,
1601 iw_handler handler)
1602 {
1603 const struct iw_priv_args * descr = NULL;
1604 unsigned int cmd;
1605 union iwreq_data * wrqu;
1606 union iwreq_data wrqu_point;
1607 int hdr_len;
1608 char * extra = NULL;
1609 int extra_size = 0;
1610 int offset = 0; /* For sub-ioctls */
1611 struct iw_request_info info;
1612 int i;
1613 int ret = -EINVAL;
1614
1615 /* Get the description of the Request */
1616 cmd = request->cmd;
1617 for(i = 0; i < dev->wireless_handlers->num_private_args; i++)
1618 if(cmd == dev->wireless_handlers->private_args[i].cmd) {
1619 descr = &(dev->wireless_handlers->private_args[i]);
1620 break;
1621 }
1622 if(descr == NULL)
1623 return -EOPNOTSUPP;
1624
1625 #ifdef WE_RTNETLINK_DEBUG
1626 printk(KERN_DEBUG "%s (WE.r) : Found private handler for 0x%04X\n",
1627 ifr->ifr_name, cmd);
1628 printk(KERN_DEBUG "%s (WE.r) : Name %s, set %X, get %X\n",
1629 dev->name, descr->name, descr->set_args, descr->get_args);
1630 #endif /* WE_RTNETLINK_DEBUG */
1631
1632 /* Compute the size of the set arguments */
1633 /* Check for sub-ioctl handler */
1634 if(descr->name[0] == '\0')
1635 /* Reserve one int for sub-ioctl index */
1636 offset = sizeof(__u32);
1637
1638 /* Size of set arguments */
1639 extra_size = get_priv_size(descr->set_args);
1640
1641 /* Does it fits in wrqu ? */
1642 if((descr->set_args & IW_PRIV_SIZE_FIXED) &&
1643 (extra_size <= IFNAMSIZ)) {
1644 hdr_len = IW_EV_LCP_LEN + extra_size;
1645 extra_size = 0;
1646 } else {
1647 hdr_len = IW_EV_POINT_LEN;
1648 }
1649
1650 /* Extract fixed header from request. This is properly aligned. */
1651 wrqu = &request->u;
1652
1653 /* Check if wrqu is complete */
1654 if(request_len < hdr_len) {
1655 #ifdef WE_RTNETLINK_DEBUG
1656 printk(KERN_DEBUG
1657 "%s (WE.r) : Wireless request too short (%d)\n",
1658 dev->name, request_len);
1659 #endif /* WE_RTNETLINK_DEBUG */
1660 return -EINVAL;
1661 }
1662
1663 /* Prepare the call */
1664 info.cmd = cmd;
1665 info.flags = 0;
1666
1667 /* Check if we have a pointer to user space data or not. */
1668 if(extra_size == 0) {
1669
1670 /* No extra arguments. Trivial to handle */
1671 ret = handler(dev, &info, wrqu, (char *) wrqu);
1672
1673 } else {
1674 int extra_len;
1675
1676 /* Put wrqu in the right place (skip pointer) */
1677 memcpy(((char *) &wrqu_point) + IW_EV_POINT_OFF,
1678 wrqu, IW_EV_POINT_LEN - IW_EV_LCP_LEN);
1679
1680 /* Does it fits within bounds ? */
1681 if(wrqu_point.data.length > (descr->set_args &
1682 IW_PRIV_SIZE_MASK))
1683 return -E2BIG;
1684
1685 /* Real length of payload */
1686 extra_len = adjust_priv_size(descr->set_args, &wrqu_point);
1687
1688 /* Check if request is self consistent */
1689 if((request_len - hdr_len) < extra_len) {
1690 #ifdef WE_RTNETLINK_DEBUG
1691 printk(KERN_DEBUG "%s (WE.r) : Wireless request data too short (%d)\n",
1692 dev->name, extra_size);
1693 #endif /* WE_RTNETLINK_DEBUG */
1694 return -EINVAL;
1695 }
1696
1697 #ifdef WE_RTNETLINK_DEBUG
1698 printk(KERN_DEBUG "%s (WE.r) : Malloc %d bytes\n",
1699 dev->name, extra_size);
1700 #endif /* WE_RTNETLINK_DEBUG */
1701
1702 /* Always allocate for max space. Easier, and won't last
1703 * long... */
1704 extra = kmalloc(extra_size, GFP_KERNEL);
1705 if (extra == NULL)
1706 return -ENOMEM;
1707
1708 /* Copy extra in aligned buffer */
1709 memcpy(extra, ((char *) request) + hdr_len, extra_len);
1710
1711 /* Call the handler */
1712 ret = handler(dev, &info, &wrqu_point, extra);
1713
1714 /* Cleanup - I told you it wasn't that long ;-) */
1715 kfree(extra);
1716 }
1717
1718 /* Call commit handler if needed and defined */
1719 if(ret == -EIWCOMMIT)
1720 ret = call_commit_handler(dev);
1721
1722 return ret;
1723 }
1724
1725 /* ---------------------------------------------------------------- */
1726 /*
1727 * Main RtNetlink dispatcher. Called from the main networking code
1728 * (do_getlink() in net/core/rtnetlink.c).
1729 * Check the type of Request and call the appropriate wrapper...
1730 */
1731 int wireless_rtnetlink_get(struct net_device * dev,
1732 char * data,
1733 int len,
1734 char ** p_buf,
1735 int * p_len)
1736 {
1737 struct iw_event * request = (struct iw_event *) data;
1738 iw_handler handler;
1739
1740 /* Check length */
1741 if(len < IW_EV_LCP_LEN) {
1742 printk(KERN_DEBUG "%s (WE.r) : RtNetlink request too short (%d)\n",
1743 dev->name, len);
1744 return -EINVAL;
1745 }
1746
1747 /* ReCheck length (len may have padding) */
1748 if(request->len > len) {
1749 printk(KERN_DEBUG "%s (WE.r) : RtNetlink request len invalid (%d-%d)\n",
1750 dev->name, request->len, len);
1751 return -EINVAL;
1752 }
1753
1754 /* Only accept GET requests in here */
1755 if(!IW_IS_GET(request->cmd))
1756 return -EOPNOTSUPP;
1757
1758 /* If command is `get the encoding parameters', check if
1759 * the user has the right to do it */
1760 if (request->cmd == SIOCGIWENCODE ||
1761 request->cmd == SIOCGIWENCODEEXT) {
1762 if (!capable(CAP_NET_ADMIN))
1763 return -EPERM;
1764 }
1765
1766 /* Special cases */
1767 if(request->cmd == SIOCGIWSTATS)
1768 /* Get Wireless Stats */
1769 return rtnetlink_standard_get(dev,
1770 request,
1771 request->len,
1772 &iw_handler_get_iwstats,
1773 p_buf, p_len);
1774 if(request->cmd == SIOCGIWPRIV) {
1775 /* Check if we have some wireless handlers defined */
1776 if(dev->wireless_handlers == NULL)
1777 return -EOPNOTSUPP;
1778 /* Get Wireless Stats */
1779 return rtnetlink_standard_get(dev,
1780 request,
1781 request->len,
1782 &iw_handler_get_private,
1783 p_buf, p_len);
1784 }
1785
1786 /* Basic check */
1787 if (!netif_device_present(dev))
1788 return -ENODEV;
1789
1790 /* Try to find the handler */
1791 handler = get_handler(dev, request->cmd);
1792 if(handler != NULL) {
1793 /* Standard and private are not the same */
1794 if(request->cmd < SIOCIWFIRSTPRIV)
1795 return rtnetlink_standard_get(dev,
1796 request,
1797 request->len,
1798 handler,
1799 p_buf, p_len);
1800 else
1801 return rtnetlink_private_get(dev,
1802 request,
1803 request->len,
1804 handler,
1805 p_buf, p_len);
1806 }
1807
1808 return -EOPNOTSUPP;
1809 }
1810
1811 /* ---------------------------------------------------------------- */
1812 /*
1813 * Main RtNetlink dispatcher. Called from the main networking code
1814 * (do_setlink() in net/core/rtnetlink.c).
1815 * Check the type of Request and call the appropriate wrapper...
1816 */
1817 int wireless_rtnetlink_set(struct net_device * dev,
1818 char * data,
1819 int len)
1820 {
1821 struct iw_event * request = (struct iw_event *) data;
1822 iw_handler handler;
1823
1824 /* Check length */
1825 if(len < IW_EV_LCP_LEN) {
1826 printk(KERN_DEBUG "%s (WE.r) : RtNetlink request too short (%d)\n",
1827 dev->name, len);
1828 return -EINVAL;
1829 }
1830
1831 /* ReCheck length (len may have padding) */
1832 if(request->len > len) {
1833 printk(KERN_DEBUG "%s (WE.r) : RtNetlink request len invalid (%d-%d)\n",
1834 dev->name, request->len, len);
1835 return -EINVAL;
1836 }
1837
1838 /* Only accept SET requests in here */
1839 if(!IW_IS_SET(request->cmd))
1840 return -EOPNOTSUPP;
1841
1842 /* Basic check */
1843 if (!netif_device_present(dev))
1844 return -ENODEV;
1845
1846 /* New driver API : try to find the handler */
1847 handler = get_handler(dev, request->cmd);
1848 if(handler != NULL) {
1849 /* Standard and private are not the same */
1850 if(request->cmd < SIOCIWFIRSTPRIV)
1851 return rtnetlink_standard_set(dev,
1852 request,
1853 request->len,
1854 handler);
1855 else
1856 return rtnetlink_private_set(dev,
1857 request,
1858 request->len,
1859 handler);
1860 }
1861
1862 return -EOPNOTSUPP;
1863 }
1864 #endif /* CONFIG_NET_WIRELESS_RTNETLINK */
1865
1866
1867 /************************* EVENT PROCESSING *************************/
1868 /*
1869 * Process events generated by the wireless layer or the driver.
1870 * Most often, the event will be propagated through rtnetlink
1871 */
1872
1873 #ifdef WE_EVENT_RTNETLINK
1874 /* ---------------------------------------------------------------- */
1875 /*
1876 * Locking...
1877 * ----------
1878 *
1879 * Thanks to Herbert Xu <herbert@gondor.apana.org.au> for fixing
1880 * the locking issue in here and implementing this code !
1881 *
1882 * The issue : wireless_send_event() is often called in interrupt context,
1883 * while the Netlink layer can never be called in interrupt context.
1884 * The fully formed RtNetlink events are queued, and then a tasklet is run
1885 * to feed those to Netlink.
1886 * The skb_queue is interrupt safe, and its lock is not held while calling
1887 * Netlink, so there is no possibility of dealock.
1888 * Jean II
1889 */
1890
1891 static struct sk_buff_head wireless_nlevent_queue;
1892
1893 static int __init wireless_nlevent_init(void)
1894 {
1895 skb_queue_head_init(&wireless_nlevent_queue);
1896 return 0;
1897 }
1898
1899 subsys_initcall(wireless_nlevent_init);
1900
1901 static void wireless_nlevent_process(unsigned long data)
1902 {
1903 struct sk_buff *skb;
1904
1905 while ((skb = skb_dequeue(&wireless_nlevent_queue)))
1906 rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
1907 }
1908
1909 static DECLARE_TASKLET(wireless_nlevent_tasklet, wireless_nlevent_process, 0);
1910
1911 /* ---------------------------------------------------------------- */
1912 /*
1913 * Fill a rtnetlink message with our event data.
1914 * Note that we propage only the specified event and don't dump the
1915 * current wireless config. Dumping the wireless config is far too
1916 * expensive (for each parameter, the driver need to query the hardware).
1917 */
1918 static inline int rtnetlink_fill_iwinfo(struct sk_buff * skb,
1919 struct net_device * dev,
1920 int type,
1921 char * event,
1922 int event_len)
1923 {
1924 struct ifinfomsg *r;
1925 struct nlmsghdr *nlh;
1926 unsigned char *b = skb->tail;
1927
1928 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(*r));
1929 r = NLMSG_DATA(nlh);
1930 r->ifi_family = AF_UNSPEC;
1931 r->__ifi_pad = 0;
1932 r->ifi_type = dev->type;
1933 r->ifi_index = dev->ifindex;
1934 r->ifi_flags = dev_get_flags(dev);
1935 r->ifi_change = 0; /* Wireless changes don't affect those flags */
1936
1937 /* Add the wireless events in the netlink packet */
1938 RTA_PUT(skb, IFLA_WIRELESS, event_len, event);
1939
1940 nlh->nlmsg_len = skb->tail - b;
1941 return skb->len;
1942
1943 nlmsg_failure:
1944 rtattr_failure:
1945 skb_trim(skb, b - skb->data);
1946 return -1;
1947 }
1948
1949 /* ---------------------------------------------------------------- */
1950 /*
1951 * Create and broadcast and send it on the standard rtnetlink socket
1952 * This is a pure clone rtmsg_ifinfo() in net/core/rtnetlink.c
1953 * Andrzej Krzysztofowicz mandated that I used a IFLA_XXX field
1954 * within a RTM_NEWLINK event.
1955 */
1956 static inline void rtmsg_iwinfo(struct net_device * dev,
1957 char * event,
1958 int event_len)
1959 {
1960 struct sk_buff *skb;
1961 int size = NLMSG_GOODSIZE;
1962
1963 skb = alloc_skb(size, GFP_ATOMIC);
1964 if (!skb)
1965 return;
1966
1967 if (rtnetlink_fill_iwinfo(skb, dev, RTM_NEWLINK,
1968 event, event_len) < 0) {
1969 kfree_skb(skb);
1970 return;
1971 }
1972 NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
1973 skb_queue_tail(&wireless_nlevent_queue, skb);
1974 tasklet_schedule(&wireless_nlevent_tasklet);
1975 }
1976
1977 #endif /* WE_EVENT_RTNETLINK */
1978
1979 /* ---------------------------------------------------------------- */
1980 /*
1981 * Main event dispatcher. Called from other parts and drivers.
1982 * Send the event on the appropriate channels.
1983 * May be called from interrupt context.
1984 */
1985 void wireless_send_event(struct net_device * dev,
1986 unsigned int cmd,
1987 union iwreq_data * wrqu,
1988 char * extra)
1989 {
1990 const struct iw_ioctl_description * descr = NULL;
1991 int extra_len = 0;
1992 struct iw_event *event; /* Mallocated whole event */
1993 int event_len; /* Its size */
1994 int hdr_len; /* Size of the event header */
1995 int wrqu_off = 0; /* Offset in wrqu */
1996 /* Don't "optimise" the following variable, it will crash */
1997 unsigned cmd_index; /* *MUST* be unsigned */
1998
1999 /* Get the description of the Event */
2000 if(cmd <= SIOCIWLAST) {
2001 cmd_index = cmd - SIOCIWFIRST;
2002 if(cmd_index < standard_ioctl_num)
2003 descr = &(standard_ioctl[cmd_index]);
2004 } else {
2005 cmd_index = cmd - IWEVFIRST;
2006 if(cmd_index < standard_event_num)
2007 descr = &(standard_event[cmd_index]);
2008 }
2009 /* Don't accept unknown events */
2010 if(descr == NULL) {
2011 /* Note : we don't return an error to the driver, because
2012 * the driver would not know what to do about it. It can't
2013 * return an error to the user, because the event is not
2014 * initiated by a user request.
2015 * The best the driver could do is to log an error message.
2016 * We will do it ourselves instead...
2017 */
2018 printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
2019 dev->name, cmd);
2020 return;
2021 }
2022 #ifdef WE_EVENT_DEBUG
2023 printk(KERN_DEBUG "%s (WE) : Got event 0x%04X\n",
2024 dev->name, cmd);
2025 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);
2026 #endif /* WE_EVENT_DEBUG */
2027
2028 /* Check extra parameters and set extra_len */
2029 if(descr->header_type == IW_HEADER_TYPE_POINT) {
2030 /* Check if number of token fits within bounds */
2031 if(wrqu->data.length > descr->max_tokens) {
2032 printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length);
2033 return;
2034 }
2035 if(wrqu->data.length < descr->min_tokens) {
2036 printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, wrqu->data.length);
2037 return;
2038 }
2039 /* Calculate extra_len - extra is NULL for restricted events */
2040 if(extra != NULL)
2041 extra_len = wrqu->data.length * descr->token_size;
2042 /* Always at an offset in wrqu */
2043 wrqu_off = IW_EV_POINT_OFF;
2044 #ifdef WE_EVENT_DEBUG
2045 printk(KERN_DEBUG "%s (WE) : Event 0x%04X, tokens %d, extra_len %d\n", dev->name, cmd, wrqu->data.length, extra_len);
2046 #endif /* WE_EVENT_DEBUG */
2047 }
2048
2049 /* Total length of the event */
2050 hdr_len = event_type_size[descr->header_type];
2051 event_len = hdr_len + extra_len;
2052
2053 #ifdef WE_EVENT_DEBUG
2054 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);
2055 #endif /* WE_EVENT_DEBUG */
2056
2057 /* Create temporary buffer to hold the event */
2058 event = kmalloc(event_len, GFP_ATOMIC);
2059 if(event == NULL)
2060 return;
2061
2062 /* Fill event */
2063 event->len = event_len;
2064 event->cmd = cmd;
2065 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
2066 if(extra != NULL)
2067 memcpy(((char *) event) + hdr_len, extra, extra_len);
2068
2069 #ifdef WE_EVENT_RTNETLINK
2070 /* Send via the RtNetlink event channel */
2071 rtmsg_iwinfo(dev, (char *) event, event_len);
2072 #endif /* WE_EVENT_RTNETLINK */
2073
2074 /* Cleanup */
2075 kfree(event);
2076
2077 return; /* Always success, I guess ;-) */
2078 }
2079
2080 /********************** ENHANCED IWSPY SUPPORT **********************/
2081 /*
2082 * In the old days, the driver was handling spy support all by itself.
2083 * Now, the driver can delegate this task to Wireless Extensions.
2084 * It needs to use those standard spy iw_handler in struct iw_handler_def,
2085 * push data to us via wireless_spy_update() and include struct iw_spy_data
2086 * in its private part (and export it in net_device->wireless_data->spy_data).
2087 * One of the main advantage of centralising spy support here is that
2088 * it becomes much easier to improve and extend it without having to touch
2089 * the drivers. One example is the addition of the Spy-Threshold events.
2090 */
2091
2092 /* ---------------------------------------------------------------- */
2093 /*
2094 * Return the pointer to the spy data in the driver.
2095 * Because this is called on the Rx path via wireless_spy_update(),
2096 * we want it to be efficient...
2097 */
2098 static inline struct iw_spy_data * get_spydata(struct net_device *dev)
2099 {
2100 /* This is the new way */
2101 if(dev->wireless_data)
2102 return(dev->wireless_data->spy_data);
2103 return NULL;
2104 }
2105
2106 /*------------------------------------------------------------------*/
2107 /*
2108 * Standard Wireless Handler : set Spy List
2109 */
2110 int iw_handler_set_spy(struct net_device * dev,
2111 struct iw_request_info * info,
2112 union iwreq_data * wrqu,
2113 char * extra)
2114 {
2115 struct iw_spy_data * spydata = get_spydata(dev);
2116 struct sockaddr * address = (struct sockaddr *) extra;
2117
2118 /* Make sure driver is not buggy or using the old API */
2119 if(!spydata)
2120 return -EOPNOTSUPP;
2121
2122 /* Disable spy collection while we copy the addresses.
2123 * While we copy addresses, any call to wireless_spy_update()
2124 * will NOP. This is OK, as anyway the addresses are changing. */
2125 spydata->spy_number = 0;
2126
2127 /* We want to operate without locking, because wireless_spy_update()
2128 * most likely will happen in the interrupt handler, and therefore
2129 * have its own locking constraints and needs performance.
2130 * The rtnl_lock() make sure we don't race with the other iw_handlers.
2131 * This make sure wireless_spy_update() "see" that the spy list
2132 * is temporarily disabled. */
2133 wmb();
2134
2135 /* Are there are addresses to copy? */
2136 if(wrqu->data.length > 0) {
2137 int i;
2138
2139 /* Copy addresses */
2140 for(i = 0; i < wrqu->data.length; i++)
2141 memcpy(spydata->spy_address[i], address[i].sa_data,
2142 ETH_ALEN);
2143 /* Reset stats */
2144 memset(spydata->spy_stat, 0,
2145 sizeof(struct iw_quality) * IW_MAX_SPY);
2146
2147 #ifdef WE_SPY_DEBUG
2148 printk(KERN_DEBUG "iw_handler_set_spy() : wireless_data %p, spydata %p, num %d\n", dev->wireless_data, spydata, wrqu->data.length);
2149 for (i = 0; i < wrqu->data.length; i++)
2150 printk(KERN_DEBUG
2151 "%02X:%02X:%02X:%02X:%02X:%02X \n",
2152 spydata->spy_address[i][0],
2153 spydata->spy_address[i][1],
2154 spydata->spy_address[i][2],
2155 spydata->spy_address[i][3],
2156 spydata->spy_address[i][4],
2157 spydata->spy_address[i][5]);
2158 #endif /* WE_SPY_DEBUG */
2159 }
2160
2161 /* Make sure above is updated before re-enabling */
2162 wmb();
2163
2164 /* Enable addresses */
2165 spydata->spy_number = wrqu->data.length;
2166
2167 return 0;
2168 }
2169
2170 /*------------------------------------------------------------------*/
2171 /*
2172 * Standard Wireless Handler : get Spy List
2173 */
2174 int iw_handler_get_spy(struct net_device * dev,
2175 struct iw_request_info * info,
2176 union iwreq_data * wrqu,
2177 char * extra)
2178 {
2179 struct iw_spy_data * spydata = get_spydata(dev);
2180 struct sockaddr * address = (struct sockaddr *) extra;
2181 int i;
2182
2183 /* Make sure driver is not buggy or using the old API */
2184 if(!spydata)
2185 return -EOPNOTSUPP;
2186
2187 wrqu->data.length = spydata->spy_number;
2188
2189 /* Copy addresses. */
2190 for(i = 0; i < spydata->spy_number; i++) {
2191 memcpy(address[i].sa_data, spydata->spy_address[i], ETH_ALEN);
2192 address[i].sa_family = AF_UNIX;
2193 }
2194 /* Copy stats to the user buffer (just after). */
2195 if(spydata->spy_number > 0)
2196 memcpy(extra + (sizeof(struct sockaddr) *spydata->spy_number),
2197 spydata->spy_stat,
2198 sizeof(struct iw_quality) * spydata->spy_number);
2199 /* Reset updated flags. */
2200 for(i = 0; i < spydata->spy_number; i++)
2201 spydata->spy_stat[i].updated &= ~IW_QUAL_ALL_UPDATED;
2202 return 0;
2203 }
2204
2205 /*------------------------------------------------------------------*/
2206 /*
2207 * Standard Wireless Handler : set spy threshold
2208 */
2209 int iw_handler_set_thrspy(struct net_device * dev,
2210 struct iw_request_info *info,
2211 union iwreq_data * wrqu,
2212 char * extra)
2213 {
2214 struct iw_spy_data * spydata = get_spydata(dev);
2215 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
2216
2217 /* Make sure driver is not buggy or using the old API */
2218 if(!spydata)
2219 return -EOPNOTSUPP;
2220
2221 /* Just do it */
2222 memcpy(&(spydata->spy_thr_low), &(threshold->low),
2223 2 * sizeof(struct iw_quality));
2224
2225 /* Clear flag */
2226 memset(spydata->spy_thr_under, '\0', sizeof(spydata->spy_thr_under));
2227
2228 #ifdef WE_SPY_DEBUG
2229 printk(KERN_DEBUG "iw_handler_set_thrspy() : low %d ; high %d\n", spydata->spy_thr_low.level, spydata->spy_thr_high.level);
2230 #endif /* WE_SPY_DEBUG */
2231
2232 return 0;
2233 }
2234
2235 /*------------------------------------------------------------------*/
2236 /*
2237 * Standard Wireless Handler : get spy threshold
2238 */
2239 int iw_handler_get_thrspy(struct net_device * dev,
2240 struct iw_request_info *info,
2241 union iwreq_data * wrqu,
2242 char * extra)
2243 {
2244 struct iw_spy_data * spydata = get_spydata(dev);
2245 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
2246
2247 /* Make sure driver is not buggy or using the old API */
2248 if(!spydata)
2249 return -EOPNOTSUPP;
2250
2251 /* Just do it */
2252 memcpy(&(threshold->low), &(spydata->spy_thr_low),
2253 2 * sizeof(struct iw_quality));
2254
2255 return 0;
2256 }
2257
2258 /*------------------------------------------------------------------*/
2259 /*
2260 * Prepare and send a Spy Threshold event
2261 */
2262 static void iw_send_thrspy_event(struct net_device * dev,
2263 struct iw_spy_data * spydata,
2264 unsigned char * address,
2265 struct iw_quality * wstats)
2266 {
2267 union iwreq_data wrqu;
2268 struct iw_thrspy threshold;
2269
2270 /* Init */
2271 wrqu.data.length = 1;
2272 wrqu.data.flags = 0;
2273 /* Copy address */
2274 memcpy(threshold.addr.sa_data, address, ETH_ALEN);
2275 threshold.addr.sa_family = ARPHRD_ETHER;
2276 /* Copy stats */
2277 memcpy(&(threshold.qual), wstats, sizeof(struct iw_quality));
2278 /* Copy also thresholds */
2279 memcpy(&(threshold.low), &(spydata->spy_thr_low),
2280 2 * sizeof(struct iw_quality));
2281
2282 #ifdef WE_SPY_DEBUG
2283 printk(KERN_DEBUG "iw_send_thrspy_event() : address %02X:%02X:%02X:%02X:%02X:%02X, level %d, up = %d\n",
2284 threshold.addr.sa_data[0],
2285 threshold.addr.sa_data[1],
2286 threshold.addr.sa_data[2],
2287 threshold.addr.sa_data[3],
2288 threshold.addr.sa_data[4],
2289 threshold.addr.sa_data[5], threshold.qual.level);
2290 #endif /* WE_SPY_DEBUG */
2291
2292 /* Send event to user space */
2293 wireless_send_event(dev, SIOCGIWTHRSPY, &wrqu, (char *) &threshold);
2294 }
2295
2296 /* ---------------------------------------------------------------- */
2297 /*
2298 * Call for the driver to update the spy data.
2299 * For now, the spy data is a simple array. As the size of the array is
2300 * small, this is good enough. If we wanted to support larger number of
2301 * spy addresses, we should use something more efficient...
2302 */
2303 void wireless_spy_update(struct net_device * dev,
2304 unsigned char * address,
2305 struct iw_quality * wstats)
2306 {
2307 struct iw_spy_data * spydata = get_spydata(dev);
2308 int i;
2309 int match = -1;
2310
2311 /* Make sure driver is not buggy or using the old API */
2312 if(!spydata)
2313 return;
2314
2315 #ifdef WE_SPY_DEBUG
2316 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]);
2317 #endif /* WE_SPY_DEBUG */
2318
2319 /* Update all records that match */
2320 for(i = 0; i < spydata->spy_number; i++)
2321 if(!compare_ether_addr(address, spydata->spy_address[i])) {
2322 memcpy(&(spydata->spy_stat[i]), wstats,
2323 sizeof(struct iw_quality));
2324 match = i;
2325 }
2326
2327 /* Generate an event if we cross the spy threshold.
2328 * To avoid event storms, we have a simple hysteresis : we generate
2329 * event only when we go under the low threshold or above the
2330 * high threshold. */
2331 if(match >= 0) {
2332 if(spydata->spy_thr_under[match]) {
2333 if(wstats->level > spydata->spy_thr_high.level) {
2334 spydata->spy_thr_under[match] = 0;
2335 iw_send_thrspy_event(dev, spydata,
2336 address, wstats);
2337 }
2338 } else {
2339 if(wstats->level < spydata->spy_thr_low.level) {
2340 spydata->spy_thr_under[match] = 1;
2341 iw_send_thrspy_event(dev, spydata,
2342 address, wstats);
2343 }
2344 }
2345 }
2346 }
2347
2348 EXPORT_SYMBOL(iw_handler_get_spy);
2349 EXPORT_SYMBOL(iw_handler_get_thrspy);
2350 EXPORT_SYMBOL(iw_handler_set_spy);
2351 EXPORT_SYMBOL(iw_handler_set_thrspy);
2352 EXPORT_SYMBOL(wireless_send_event);
2353 EXPORT_SYMBOL(wireless_spy_update);
CRIS linux kernel tree