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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/core/wireless.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/core/wireless.c')
-rw-r--r--net/core/wireless.c1459
1 files changed, 1459 insertions, 0 deletions
diff --git a/net/core/wireless.c b/net/core/wireless.c
new file mode 100644
index 000000000000..750cc5daeb03
--- /dev/null
+++ b/net/core/wireless.c
@@ -0,0 +1,1459 @@
1/*
2 * This file implement the Wireless Extensions APIs.
3 *
4 * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
5 * Copyright (c) 1997-2004 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 */
100static 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 [SIOCGIWAPLIST - SIOCIWFIRST] = {
191 .header_type = IW_HEADER_TYPE_POINT,
192 .token_size = sizeof(struct sockaddr) +
193 sizeof(struct iw_quality),
194 .max_tokens = IW_MAX_AP,
195 .flags = IW_DESCR_FLAG_NOMAX,
196 },
197 [SIOCSIWSCAN - SIOCIWFIRST] = {
198 .header_type = IW_HEADER_TYPE_PARAM,
199 },
200 [SIOCGIWSCAN - SIOCIWFIRST] = {
201 .header_type = IW_HEADER_TYPE_POINT,
202 .token_size = 1,
203 .max_tokens = IW_SCAN_MAX_DATA,
204 .flags = IW_DESCR_FLAG_NOMAX,
205 },
206 [SIOCSIWESSID - SIOCIWFIRST] = {
207 .header_type = IW_HEADER_TYPE_POINT,
208 .token_size = 1,
209 .max_tokens = IW_ESSID_MAX_SIZE + 1,
210 .flags = IW_DESCR_FLAG_EVENT,
211 },
212 [SIOCGIWESSID - SIOCIWFIRST] = {
213 .header_type = IW_HEADER_TYPE_POINT,
214 .token_size = 1,
215 .max_tokens = IW_ESSID_MAX_SIZE + 1,
216 .flags = IW_DESCR_FLAG_DUMP,
217 },
218 [SIOCSIWNICKN - SIOCIWFIRST] = {
219 .header_type = IW_HEADER_TYPE_POINT,
220 .token_size = 1,
221 .max_tokens = IW_ESSID_MAX_SIZE + 1,
222 },
223 [SIOCGIWNICKN - SIOCIWFIRST] = {
224 .header_type = IW_HEADER_TYPE_POINT,
225 .token_size = 1,
226 .max_tokens = IW_ESSID_MAX_SIZE + 1,
227 },
228 [SIOCSIWRATE - SIOCIWFIRST] = {
229 .header_type = IW_HEADER_TYPE_PARAM,
230 },
231 [SIOCGIWRATE - SIOCIWFIRST] = {
232 .header_type = IW_HEADER_TYPE_PARAM,
233 },
234 [SIOCSIWRTS - SIOCIWFIRST] = {
235 .header_type = IW_HEADER_TYPE_PARAM,
236 },
237 [SIOCGIWRTS - SIOCIWFIRST] = {
238 .header_type = IW_HEADER_TYPE_PARAM,
239 },
240 [SIOCSIWFRAG - SIOCIWFIRST] = {
241 .header_type = IW_HEADER_TYPE_PARAM,
242 },
243 [SIOCGIWFRAG - SIOCIWFIRST] = {
244 .header_type = IW_HEADER_TYPE_PARAM,
245 },
246 [SIOCSIWTXPOW - SIOCIWFIRST] = {
247 .header_type = IW_HEADER_TYPE_PARAM,
248 },
249 [SIOCGIWTXPOW - SIOCIWFIRST] = {
250 .header_type = IW_HEADER_TYPE_PARAM,
251 },
252 [SIOCSIWRETRY - SIOCIWFIRST] = {
253 .header_type = IW_HEADER_TYPE_PARAM,
254 },
255 [SIOCGIWRETRY - SIOCIWFIRST] = {
256 .header_type = IW_HEADER_TYPE_PARAM,
257 },
258 [SIOCSIWENCODE - SIOCIWFIRST] = {
259 .header_type = IW_HEADER_TYPE_POINT,
260 .token_size = 1,
261 .max_tokens = IW_ENCODING_TOKEN_MAX,
262 .flags = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
263 },
264 [SIOCGIWENCODE - SIOCIWFIRST] = {
265 .header_type = IW_HEADER_TYPE_POINT,
266 .token_size = 1,
267 .max_tokens = IW_ENCODING_TOKEN_MAX,
268 .flags = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
269 },
270 [SIOCSIWPOWER - SIOCIWFIRST] = {
271 .header_type = IW_HEADER_TYPE_PARAM,
272 },
273 [SIOCGIWPOWER - SIOCIWFIRST] = {
274 .header_type = IW_HEADER_TYPE_PARAM,
275 },
276};
277static const int standard_ioctl_num = (sizeof(standard_ioctl) /
278 sizeof(struct iw_ioctl_description));
279
280/*
281 * Meta-data about all the additional standard Wireless Extension events
282 * we know about.
283 */
284static const struct iw_ioctl_description standard_event[] = {
285 [IWEVTXDROP - IWEVFIRST] = {
286 .header_type = IW_HEADER_TYPE_ADDR,
287 },
288 [IWEVQUAL - IWEVFIRST] = {
289 .header_type = IW_HEADER_TYPE_QUAL,
290 },
291 [IWEVCUSTOM - IWEVFIRST] = {
292 .header_type = IW_HEADER_TYPE_POINT,
293 .token_size = 1,
294 .max_tokens = IW_CUSTOM_MAX,
295 },
296 [IWEVREGISTERED - IWEVFIRST] = {
297 .header_type = IW_HEADER_TYPE_ADDR,
298 },
299 [IWEVEXPIRED - IWEVFIRST] = {
300 .header_type = IW_HEADER_TYPE_ADDR,
301 },
302};
303static const int standard_event_num = (sizeof(standard_event) /
304 sizeof(struct iw_ioctl_description));
305
306/* Size (in bytes) of the various private data types */
307static const char iw_priv_type_size[] = {
308 0, /* IW_PRIV_TYPE_NONE */
309 1, /* IW_PRIV_TYPE_BYTE */
310 1, /* IW_PRIV_TYPE_CHAR */
311 0, /* Not defined */
312 sizeof(__u32), /* IW_PRIV_TYPE_INT */
313 sizeof(struct iw_freq), /* IW_PRIV_TYPE_FLOAT */
314 sizeof(struct sockaddr), /* IW_PRIV_TYPE_ADDR */
315 0, /* Not defined */
316};
317
318/* Size (in bytes) of various events */
319static const int event_type_size[] = {
320 IW_EV_LCP_LEN, /* IW_HEADER_TYPE_NULL */
321 0,
322 IW_EV_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
323 0,
324 IW_EV_UINT_LEN, /* IW_HEADER_TYPE_UINT */
325 IW_EV_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
326 IW_EV_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
327 0,
328 IW_EV_POINT_LEN, /* Without variable payload */
329 IW_EV_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
330 IW_EV_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
331};
332
333/************************ COMMON SUBROUTINES ************************/
334/*
335 * Stuff that may be used in various place or doesn't fit in one
336 * of the section below.
337 */
338
339/* ---------------------------------------------------------------- */
340/*
341 * Return the driver handler associated with a specific Wireless Extension.
342 * Called from various place, so make sure it remains efficient.
343 */
344static inline iw_handler get_handler(struct net_device *dev,
345 unsigned int cmd)
346{
347 /* Don't "optimise" the following variable, it will crash */
348 unsigned int index; /* *MUST* be unsigned */
349
350 /* Check if we have some wireless handlers defined */
351 if(dev->wireless_handlers == NULL)
352 return NULL;
353
354 /* Try as a standard command */
355 index = cmd - SIOCIWFIRST;
356 if(index < dev->wireless_handlers->num_standard)
357 return dev->wireless_handlers->standard[index];
358
359 /* Try as a private command */
360 index = cmd - SIOCIWFIRSTPRIV;
361 if(index < dev->wireless_handlers->num_private)
362 return dev->wireless_handlers->private[index];
363
364 /* Not found */
365 return NULL;
366}
367
368/* ---------------------------------------------------------------- */
369/*
370 * Get statistics out of the driver
371 */
372static inline struct iw_statistics *get_wireless_stats(struct net_device *dev)
373{
374 /* New location */
375 if((dev->wireless_handlers != NULL) &&
376 (dev->wireless_handlers->get_wireless_stats != NULL))
377 return dev->wireless_handlers->get_wireless_stats(dev);
378
379 /* Old location, will be phased out in next WE */
380 return (dev->get_wireless_stats ?
381 dev->get_wireless_stats(dev) :
382 (struct iw_statistics *) NULL);
383}
384
385/* ---------------------------------------------------------------- */
386/*
387 * Call the commit handler in the driver
388 * (if exist and if conditions are right)
389 *
390 * Note : our current commit strategy is currently pretty dumb,
391 * but we will be able to improve on that...
392 * The goal is to try to agreagate as many changes as possible
393 * before doing the commit. Drivers that will define a commit handler
394 * are usually those that need a reset after changing parameters, so
395 * we want to minimise the number of reset.
396 * A cool idea is to use a timer : at each "set" command, we re-set the
397 * timer, when the timer eventually fires, we call the driver.
398 * Hopefully, more on that later.
399 *
400 * Also, I'm waiting to see how many people will complain about the
401 * netif_running(dev) test. I'm open on that one...
402 * Hopefully, the driver will remember to do a commit in "open()" ;-)
403 */
404static inline int call_commit_handler(struct net_device * dev)
405{
406 if((netif_running(dev)) &&
407 (dev->wireless_handlers->standard[0] != NULL)) {
408 /* Call the commit handler on the driver */
409 return dev->wireless_handlers->standard[0](dev, NULL,
410 NULL, NULL);
411 } else
412 return 0; /* Command completed successfully */
413}
414
415/* ---------------------------------------------------------------- */
416/*
417 * Calculate size of private arguments
418 */
419static inline int get_priv_size(__u16 args)
420{
421 int num = args & IW_PRIV_SIZE_MASK;
422 int type = (args & IW_PRIV_TYPE_MASK) >> 12;
423
424 return num * iw_priv_type_size[type];
425}
426
427/* ---------------------------------------------------------------- */
428/*
429 * Re-calculate the size of private arguments
430 */
431static inline int adjust_priv_size(__u16 args,
432 union iwreq_data * wrqu)
433{
434 int num = wrqu->data.length;
435 int max = args & IW_PRIV_SIZE_MASK;
436 int type = (args & IW_PRIV_TYPE_MASK) >> 12;
437
438 /* Make sure the driver doesn't goof up */
439 if (max < num)
440 num = max;
441
442 return num * iw_priv_type_size[type];
443}
444
445
446/******************** /proc/net/wireless SUPPORT ********************/
447/*
448 * The /proc/net/wireless file is a human readable user-space interface
449 * exporting various wireless specific statistics from the wireless devices.
450 * This is the most popular part of the Wireless Extensions ;-)
451 *
452 * This interface is a pure clone of /proc/net/dev (in net/core/dev.c).
453 * The content of the file is basically the content of "struct iw_statistics".
454 */
455
456#ifdef CONFIG_PROC_FS
457
458/* ---------------------------------------------------------------- */
459/*
460 * Print one entry (line) of /proc/net/wireless
461 */
462static __inline__ void wireless_seq_printf_stats(struct seq_file *seq,
463 struct net_device *dev)
464{
465 /* Get stats from the driver */
466 struct iw_statistics *stats = get_wireless_stats(dev);
467
468 if (stats) {
469 seq_printf(seq, "%6s: %04x %3d%c %3d%c %3d%c %6d %6d %6d "
470 "%6d %6d %6d\n",
471 dev->name, stats->status, stats->qual.qual,
472 stats->qual.updated & IW_QUAL_QUAL_UPDATED
473 ? '.' : ' ',
474 ((__u8) stats->qual.level),
475 stats->qual.updated & IW_QUAL_LEVEL_UPDATED
476 ? '.' : ' ',
477 ((__u8) stats->qual.noise),
478 stats->qual.updated & IW_QUAL_NOISE_UPDATED
479 ? '.' : ' ',
480 stats->discard.nwid, stats->discard.code,
481 stats->discard.fragment, stats->discard.retries,
482 stats->discard.misc, stats->miss.beacon);
483 stats->qual.updated = 0;
484 }
485}
486
487/* ---------------------------------------------------------------- */
488/*
489 * Print info for /proc/net/wireless (print all entries)
490 */
491static int wireless_seq_show(struct seq_file *seq, void *v)
492{
493 if (v == SEQ_START_TOKEN)
494 seq_printf(seq, "Inter-| sta-| Quality | Discarded "
495 "packets | Missed | WE\n"
496 " face | tus | link level noise | nwid "
497 "crypt frag retry misc | beacon | %d\n",
498 WIRELESS_EXT);
499 else
500 wireless_seq_printf_stats(seq, v);
501 return 0;
502}
503
504extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
505extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
506extern void dev_seq_stop(struct seq_file *seq, void *v);
507
508static struct seq_operations wireless_seq_ops = {
509 .start = dev_seq_start,
510 .next = dev_seq_next,
511 .stop = dev_seq_stop,
512 .show = wireless_seq_show,
513};
514
515static int wireless_seq_open(struct inode *inode, struct file *file)
516{
517 return seq_open(file, &wireless_seq_ops);
518}
519
520static struct file_operations wireless_seq_fops = {
521 .owner = THIS_MODULE,
522 .open = wireless_seq_open,
523 .read = seq_read,
524 .llseek = seq_lseek,
525 .release = seq_release,
526};
527
528int __init wireless_proc_init(void)
529{
530 if (!proc_net_fops_create("wireless", S_IRUGO, &wireless_seq_fops))
531 return -ENOMEM;
532
533 return 0;
534}
535#endif /* CONFIG_PROC_FS */
536
537/************************** IOCTL SUPPORT **************************/
538/*
539 * The original user space API to configure all those Wireless Extensions
540 * is through IOCTLs.
541 * In there, we check if we need to call the new driver API (iw_handler)
542 * or just call the driver ioctl handler.
543 */
544
545/* ---------------------------------------------------------------- */
546/*
547 * Allow programatic access to /proc/net/wireless even if /proc
548 * doesn't exist... Also more efficient...
549 */
550static inline int dev_iwstats(struct net_device *dev, struct ifreq *ifr)
551{
552 /* Get stats from the driver */
553 struct iw_statistics *stats;
554
555 stats = get_wireless_stats(dev);
556 if (stats != (struct iw_statistics *) NULL) {
557 struct iwreq * wrq = (struct iwreq *)ifr;
558
559 /* Copy statistics to the user buffer */
560 if(copy_to_user(wrq->u.data.pointer, stats,
561 sizeof(struct iw_statistics)))
562 return -EFAULT;
563
564 /* Check if we need to clear the update flag */
565 if(wrq->u.data.flags != 0)
566 stats->qual.updated = 0;
567 return 0;
568 } else
569 return -EOPNOTSUPP;
570}
571
572/* ---------------------------------------------------------------- */
573/*
574 * Export the driver private handler definition
575 * They will be picked up by tools like iwpriv...
576 */
577static inline int ioctl_export_private(struct net_device * dev,
578 struct ifreq * ifr)
579{
580 struct iwreq * iwr = (struct iwreq *) ifr;
581
582 /* Check if the driver has something to export */
583 if((dev->wireless_handlers->num_private_args == 0) ||
584 (dev->wireless_handlers->private_args == NULL))
585 return -EOPNOTSUPP;
586
587 /* Check NULL pointer */
588 if(iwr->u.data.pointer == NULL)
589 return -EFAULT;
590
591 /* Check if there is enough buffer up there */
592 if(iwr->u.data.length < dev->wireless_handlers->num_private_args) {
593 /* User space can't know in advance how large the buffer
594 * needs to be. Give it a hint, so that we can support
595 * any size buffer we want somewhat efficiently... */
596 iwr->u.data.length = dev->wireless_handlers->num_private_args;
597 return -E2BIG;
598 }
599
600 /* Set the number of available ioctls. */
601 iwr->u.data.length = dev->wireless_handlers->num_private_args;
602
603 /* Copy structure to the user buffer. */
604 if (copy_to_user(iwr->u.data.pointer,
605 dev->wireless_handlers->private_args,
606 sizeof(struct iw_priv_args) * iwr->u.data.length))
607 return -EFAULT;
608
609 return 0;
610}
611
612/* ---------------------------------------------------------------- */
613/*
614 * Wrapper to call a standard Wireless Extension handler.
615 * We do various checks and also take care of moving data between
616 * user space and kernel space.
617 */
618static inline int ioctl_standard_call(struct net_device * dev,
619 struct ifreq * ifr,
620 unsigned int cmd,
621 iw_handler handler)
622{
623 struct iwreq * iwr = (struct iwreq *) ifr;
624 const struct iw_ioctl_description * descr;
625 struct iw_request_info info;
626 int ret = -EINVAL;
627
628 /* Get the description of the IOCTL */
629 if((cmd - SIOCIWFIRST) >= standard_ioctl_num)
630 return -EOPNOTSUPP;
631 descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
632
633#ifdef WE_IOCTL_DEBUG
634 printk(KERN_DEBUG "%s (WE) : Found standard handler for 0x%04X\n",
635 ifr->ifr_name, cmd);
636 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);
637#endif /* WE_IOCTL_DEBUG */
638
639 /* Prepare the call */
640 info.cmd = cmd;
641 info.flags = 0;
642
643 /* Check if we have a pointer to user space data or not */
644 if(descr->header_type != IW_HEADER_TYPE_POINT) {
645
646 /* No extra arguments. Trivial to handle */
647 ret = handler(dev, &info, &(iwr->u), NULL);
648
649#ifdef WE_SET_EVENT
650 /* Generate an event to notify listeners of the change */
651 if((descr->flags & IW_DESCR_FLAG_EVENT) &&
652 ((ret == 0) || (ret == -EIWCOMMIT)))
653 wireless_send_event(dev, cmd, &(iwr->u), NULL);
654#endif /* WE_SET_EVENT */
655 } else {
656 char * extra;
657 int extra_size;
658 int user_length = 0;
659 int err;
660
661 /* Calculate space needed by arguments. Always allocate
662 * for max space. Easier, and won't last long... */
663 extra_size = descr->max_tokens * descr->token_size;
664
665 /* Check what user space is giving us */
666 if(IW_IS_SET(cmd)) {
667 /* Check NULL pointer */
668 if((iwr->u.data.pointer == NULL) &&
669 (iwr->u.data.length != 0))
670 return -EFAULT;
671 /* Check if number of token fits within bounds */
672 if(iwr->u.data.length > descr->max_tokens)
673 return -E2BIG;
674 if(iwr->u.data.length < descr->min_tokens)
675 return -EINVAL;
676 } else {
677 /* Check NULL pointer */
678 if(iwr->u.data.pointer == NULL)
679 return -EFAULT;
680 /* Save user space buffer size for checking */
681 user_length = iwr->u.data.length;
682
683 /* Don't check if user_length > max to allow forward
684 * compatibility. The test user_length < min is
685 * implied by the test at the end. */
686
687 /* Support for very large requests */
688 if((descr->flags & IW_DESCR_FLAG_NOMAX) &&
689 (user_length > descr->max_tokens)) {
690 /* Allow userspace to GET more than max so
691 * we can support any size GET requests.
692 * There is still a limit : -ENOMEM. */
693 extra_size = user_length * descr->token_size;
694 /* Note : user_length is originally a __u16,
695 * and token_size is controlled by us,
696 * so extra_size won't get negative and
697 * won't overflow... */
698 }
699 }
700
701#ifdef WE_IOCTL_DEBUG
702 printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n",
703 dev->name, extra_size);
704#endif /* WE_IOCTL_DEBUG */
705
706 /* Create the kernel buffer */
707 extra = kmalloc(extra_size, GFP_KERNEL);
708 if (extra == NULL) {
709 return -ENOMEM;
710 }
711
712 /* If it is a SET, get all the extra data in here */
713 if(IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
714 err = copy_from_user(extra, iwr->u.data.pointer,
715 iwr->u.data.length *
716 descr->token_size);
717 if (err) {
718 kfree(extra);
719 return -EFAULT;
720 }
721#ifdef WE_IOCTL_DEBUG
722 printk(KERN_DEBUG "%s (WE) : Got %d bytes\n",
723 dev->name,
724 iwr->u.data.length * descr->token_size);
725#endif /* WE_IOCTL_DEBUG */
726 }
727
728 /* Call the handler */
729 ret = handler(dev, &info, &(iwr->u), extra);
730
731 /* If we have something to return to the user */
732 if (!ret && IW_IS_GET(cmd)) {
733 /* Check if there is enough buffer up there */
734 if(user_length < iwr->u.data.length) {
735 kfree(extra);
736 return -E2BIG;
737 }
738
739 err = copy_to_user(iwr->u.data.pointer, extra,
740 iwr->u.data.length *
741 descr->token_size);
742 if (err)
743 ret = -EFAULT;
744#ifdef WE_IOCTL_DEBUG
745 printk(KERN_DEBUG "%s (WE) : Wrote %d bytes\n",
746 dev->name,
747 iwr->u.data.length * descr->token_size);
748#endif /* WE_IOCTL_DEBUG */
749 }
750
751#ifdef WE_SET_EVENT
752 /* Generate an event to notify listeners of the change */
753 if((descr->flags & IW_DESCR_FLAG_EVENT) &&
754 ((ret == 0) || (ret == -EIWCOMMIT))) {
755 if(descr->flags & IW_DESCR_FLAG_RESTRICT)
756 /* If the event is restricted, don't
757 * export the payload */
758 wireless_send_event(dev, cmd, &(iwr->u), NULL);
759 else
760 wireless_send_event(dev, cmd, &(iwr->u),
761 extra);
762 }
763#endif /* WE_SET_EVENT */
764
765 /* Cleanup - I told you it wasn't that long ;-) */
766 kfree(extra);
767 }
768
769 /* Call commit handler if needed and defined */
770 if(ret == -EIWCOMMIT)
771 ret = call_commit_handler(dev);
772
773 /* Here, we will generate the appropriate event if needed */
774
775 return ret;
776}
777
778/* ---------------------------------------------------------------- */
779/*
780 * Wrapper to call a private Wireless Extension handler.
781 * We do various checks and also take care of moving data between
782 * user space and kernel space.
783 * It's not as nice and slimline as the standard wrapper. The cause
784 * is struct iw_priv_args, which was not really designed for the
785 * job we are going here.
786 *
787 * IMPORTANT : This function prevent to set and get data on the same
788 * IOCTL and enforce the SET/GET convention. Not doing it would be
789 * far too hairy...
790 * If you need to set and get data at the same time, please don't use
791 * a iw_handler but process it in your ioctl handler (i.e. use the
792 * old driver API).
793 */
794static inline int ioctl_private_call(struct net_device * dev,
795 struct ifreq * ifr,
796 unsigned int cmd,
797 iw_handler handler)
798{
799 struct iwreq * iwr = (struct iwreq *) ifr;
800 const struct iw_priv_args * descr = NULL;
801 struct iw_request_info info;
802 int extra_size = 0;
803 int i;
804 int ret = -EINVAL;
805
806 /* Get the description of the IOCTL */
807 for(i = 0; i < dev->wireless_handlers->num_private_args; i++)
808 if(cmd == dev->wireless_handlers->private_args[i].cmd) {
809 descr = &(dev->wireless_handlers->private_args[i]);
810 break;
811 }
812
813#ifdef WE_IOCTL_DEBUG
814 printk(KERN_DEBUG "%s (WE) : Found private handler for 0x%04X\n",
815 ifr->ifr_name, cmd);
816 if(descr) {
817 printk(KERN_DEBUG "%s (WE) : Name %s, set %X, get %X\n",
818 dev->name, descr->name,
819 descr->set_args, descr->get_args);
820 }
821#endif /* WE_IOCTL_DEBUG */
822
823 /* Compute the size of the set/get arguments */
824 if(descr != NULL) {
825 if(IW_IS_SET(cmd)) {
826 int offset = 0; /* For sub-ioctls */
827 /* Check for sub-ioctl handler */
828 if(descr->name[0] == '\0')
829 /* Reserve one int for sub-ioctl index */
830 offset = sizeof(__u32);
831
832 /* Size of set arguments */
833 extra_size = get_priv_size(descr->set_args);
834
835 /* Does it fits in iwr ? */
836 if((descr->set_args & IW_PRIV_SIZE_FIXED) &&
837 ((extra_size + offset) <= IFNAMSIZ))
838 extra_size = 0;
839 } else {
840 /* Size of get arguments */
841 extra_size = get_priv_size(descr->get_args);
842
843 /* Does it fits in iwr ? */
844 if((descr->get_args & IW_PRIV_SIZE_FIXED) &&
845 (extra_size <= IFNAMSIZ))
846 extra_size = 0;
847 }
848 }
849
850 /* Prepare the call */
851 info.cmd = cmd;
852 info.flags = 0;
853
854 /* Check if we have a pointer to user space data or not. */
855 if(extra_size == 0) {
856 /* No extra arguments. Trivial to handle */
857 ret = handler(dev, &info, &(iwr->u), (char *) &(iwr->u));
858 } else {
859 char * extra;
860 int err;
861
862 /* Check what user space is giving us */
863 if(IW_IS_SET(cmd)) {
864 /* Check NULL pointer */
865 if((iwr->u.data.pointer == NULL) &&
866 (iwr->u.data.length != 0))
867 return -EFAULT;
868
869 /* Does it fits within bounds ? */
870 if(iwr->u.data.length > (descr->set_args &
871 IW_PRIV_SIZE_MASK))
872 return -E2BIG;
873 } else {
874 /* Check NULL pointer */
875 if(iwr->u.data.pointer == NULL)
876 return -EFAULT;
877 }
878
879#ifdef WE_IOCTL_DEBUG
880 printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n",
881 dev->name, extra_size);
882#endif /* WE_IOCTL_DEBUG */
883
884 /* Always allocate for max space. Easier, and won't last
885 * long... */
886 extra = kmalloc(extra_size, GFP_KERNEL);
887 if (extra == NULL) {
888 return -ENOMEM;
889 }
890
891 /* If it is a SET, get all the extra data in here */
892 if(IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
893 err = copy_from_user(extra, iwr->u.data.pointer,
894 extra_size);
895 if (err) {
896 kfree(extra);
897 return -EFAULT;
898 }
899#ifdef WE_IOCTL_DEBUG
900 printk(KERN_DEBUG "%s (WE) : Got %d elem\n",
901 dev->name, iwr->u.data.length);
902#endif /* WE_IOCTL_DEBUG */
903 }
904
905 /* Call the handler */
906 ret = handler(dev, &info, &(iwr->u), extra);
907
908 /* If we have something to return to the user */
909 if (!ret && IW_IS_GET(cmd)) {
910
911 /* Adjust for the actual length if it's variable,
912 * avoid leaking kernel bits outside. */
913 if (!(descr->get_args & IW_PRIV_SIZE_FIXED)) {
914 extra_size = adjust_priv_size(descr->get_args,
915 &(iwr->u));
916 }
917
918 err = copy_to_user(iwr->u.data.pointer, extra,
919 extra_size);
920 if (err)
921 ret = -EFAULT;
922#ifdef WE_IOCTL_DEBUG
923 printk(KERN_DEBUG "%s (WE) : Wrote %d elem\n",
924 dev->name, iwr->u.data.length);
925#endif /* WE_IOCTL_DEBUG */
926 }
927
928 /* Cleanup - I told you it wasn't that long ;-) */
929 kfree(extra);
930 }
931
932
933 /* Call commit handler if needed and defined */
934 if(ret == -EIWCOMMIT)
935 ret = call_commit_handler(dev);
936
937 return ret;
938}
939
940/* ---------------------------------------------------------------- */
941/*
942 * Main IOCTl dispatcher. Called from the main networking code
943 * (dev_ioctl() in net/core/dev.c).
944 * Check the type of IOCTL and call the appropriate wrapper...
945 */
946int wireless_process_ioctl(struct ifreq *ifr, unsigned int cmd)
947{
948 struct net_device *dev;
949 iw_handler handler;
950
951 /* Permissions are already checked in dev_ioctl() before calling us.
952 * The copy_to/from_user() of ifr is also dealt with in there */
953
954 /* Make sure the device exist */
955 if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL)
956 return -ENODEV;
957
958 /* A bunch of special cases, then the generic case...
959 * Note that 'cmd' is already filtered in dev_ioctl() with
960 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
961 switch(cmd)
962 {
963 case SIOCGIWSTATS:
964 /* Get Wireless Stats */
965 return dev_iwstats(dev, ifr);
966
967 case SIOCGIWPRIV:
968 /* Check if we have some wireless handlers defined */
969 if(dev->wireless_handlers != NULL) {
970 /* We export to user space the definition of
971 * the private handler ourselves */
972 return ioctl_export_private(dev, ifr);
973 }
974 // ## Fall-through for old API ##
975 default:
976 /* Generic IOCTL */
977 /* Basic check */
978 if (!netif_device_present(dev))
979 return -ENODEV;
980 /* New driver API : try to find the handler */
981 handler = get_handler(dev, cmd);
982 if(handler != NULL) {
983 /* Standard and private are not the same */
984 if(cmd < SIOCIWFIRSTPRIV)
985 return ioctl_standard_call(dev,
986 ifr,
987 cmd,
988 handler);
989 else
990 return ioctl_private_call(dev,
991 ifr,
992 cmd,
993 handler);
994 }
995 /* Old driver API : call driver ioctl handler */
996 if (dev->do_ioctl) {
997 return dev->do_ioctl(dev, ifr, cmd);
998 }
999 return -EOPNOTSUPP;
1000 }
1001 /* Not reached */
1002 return -EINVAL;
1003}
1004
1005/************************* EVENT PROCESSING *************************/
1006/*
1007 * Process events generated by the wireless layer or the driver.
1008 * Most often, the event will be propagated through rtnetlink
1009 */
1010
1011#ifdef WE_EVENT_NETLINK
1012/* "rtnl" is defined in net/core/rtnetlink.c, but we need it here.
1013 * It is declared in <linux/rtnetlink.h> */
1014
1015/* ---------------------------------------------------------------- */
1016/*
1017 * Fill a rtnetlink message with our event data.
1018 * Note that we propage only the specified event and don't dump the
1019 * current wireless config. Dumping the wireless config is far too
1020 * expensive (for each parameter, the driver need to query the hardware).
1021 */
1022static inline int rtnetlink_fill_iwinfo(struct sk_buff * skb,
1023 struct net_device * dev,
1024 int type,
1025 char * event,
1026 int event_len)
1027{
1028 struct ifinfomsg *r;
1029 struct nlmsghdr *nlh;
1030 unsigned char *b = skb->tail;
1031
1032 nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(*r));
1033 r = NLMSG_DATA(nlh);
1034 r->ifi_family = AF_UNSPEC;
1035 r->ifi_type = dev->type;
1036 r->ifi_index = dev->ifindex;
1037 r->ifi_flags = dev->flags;
1038 r->ifi_change = 0; /* Wireless changes don't affect those flags */
1039
1040 /* Add the wireless events in the netlink packet */
1041 RTA_PUT(skb, IFLA_WIRELESS,
1042 event_len, event);
1043
1044 nlh->nlmsg_len = skb->tail - b;
1045 return skb->len;
1046
1047nlmsg_failure:
1048rtattr_failure:
1049 skb_trim(skb, b - skb->data);
1050 return -1;
1051}
1052
1053/* ---------------------------------------------------------------- */
1054/*
1055 * Create and broadcast and send it on the standard rtnetlink socket
1056 * This is a pure clone rtmsg_ifinfo() in net/core/rtnetlink.c
1057 * Andrzej Krzysztofowicz mandated that I used a IFLA_XXX field
1058 * within a RTM_NEWLINK event.
1059 */
1060static inline void rtmsg_iwinfo(struct net_device * dev,
1061 char * event,
1062 int event_len)
1063{
1064 struct sk_buff *skb;
1065 int size = NLMSG_GOODSIZE;
1066
1067 skb = alloc_skb(size, GFP_ATOMIC);
1068 if (!skb)
1069 return;
1070
1071 if (rtnetlink_fill_iwinfo(skb, dev, RTM_NEWLINK,
1072 event, event_len) < 0) {
1073 kfree_skb(skb);
1074 return;
1075 }
1076 NETLINK_CB(skb).dst_groups = RTMGRP_LINK;
1077 netlink_broadcast(rtnl, skb, 0, RTMGRP_LINK, GFP_ATOMIC);
1078}
1079#endif /* WE_EVENT_NETLINK */
1080
1081/* ---------------------------------------------------------------- */
1082/*
1083 * Main event dispatcher. Called from other parts and drivers.
1084 * Send the event on the appropriate channels.
1085 * May be called from interrupt context.
1086 */
1087void wireless_send_event(struct net_device * dev,
1088 unsigned int cmd,
1089 union iwreq_data * wrqu,
1090 char * extra)
1091{
1092 const struct iw_ioctl_description * descr = NULL;
1093 int extra_len = 0;
1094 struct iw_event *event; /* Mallocated whole event */
1095 int event_len; /* Its size */
1096 int hdr_len; /* Size of the event header */
1097 /* Don't "optimise" the following variable, it will crash */
1098 unsigned cmd_index; /* *MUST* be unsigned */
1099
1100 /* Get the description of the IOCTL */
1101 if(cmd <= SIOCIWLAST) {
1102 cmd_index = cmd - SIOCIWFIRST;
1103 if(cmd_index < standard_ioctl_num)
1104 descr = &(standard_ioctl[cmd_index]);
1105 } else {
1106 cmd_index = cmd - IWEVFIRST;
1107 if(cmd_index < standard_event_num)
1108 descr = &(standard_event[cmd_index]);
1109 }
1110 /* Don't accept unknown events */
1111 if(descr == NULL) {
1112 /* Note : we don't return an error to the driver, because
1113 * the driver would not know what to do about it. It can't
1114 * return an error to the user, because the event is not
1115 * initiated by a user request.
1116 * The best the driver could do is to log an error message.
1117 * We will do it ourselves instead...
1118 */
1119 printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
1120 dev->name, cmd);
1121 return;
1122 }
1123#ifdef WE_EVENT_DEBUG
1124 printk(KERN_DEBUG "%s (WE) : Got event 0x%04X\n",
1125 dev->name, cmd);
1126 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);
1127#endif /* WE_EVENT_DEBUG */
1128
1129 /* Check extra parameters and set extra_len */
1130 if(descr->header_type == IW_HEADER_TYPE_POINT) {
1131 /* Check if number of token fits within bounds */
1132 if(wrqu->data.length > descr->max_tokens) {
1133 printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length);
1134 return;
1135 }
1136 if(wrqu->data.length < descr->min_tokens) {
1137 printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, wrqu->data.length);
1138 return;
1139 }
1140 /* Calculate extra_len - extra is NULL for restricted events */
1141 if(extra != NULL)
1142 extra_len = wrqu->data.length * descr->token_size;
1143#ifdef WE_EVENT_DEBUG
1144 printk(KERN_DEBUG "%s (WE) : Event 0x%04X, tokens %d, extra_len %d\n", dev->name, cmd, wrqu->data.length, extra_len);
1145#endif /* WE_EVENT_DEBUG */
1146 }
1147
1148 /* Total length of the event */
1149 hdr_len = event_type_size[descr->header_type];
1150 event_len = hdr_len + extra_len;
1151
1152#ifdef WE_EVENT_DEBUG
1153 printk(KERN_DEBUG "%s (WE) : Event 0x%04X, hdr_len %d, event_len %d\n", dev->name, cmd, hdr_len, event_len);
1154#endif /* WE_EVENT_DEBUG */
1155
1156 /* Create temporary buffer to hold the event */
1157 event = kmalloc(event_len, GFP_ATOMIC);
1158 if(event == NULL)
1159 return;
1160
1161 /* Fill event */
1162 event->len = event_len;
1163 event->cmd = cmd;
1164 memcpy(&event->u, wrqu, hdr_len - IW_EV_LCP_LEN);
1165 if(extra != NULL)
1166 memcpy(((char *) event) + hdr_len, extra, extra_len);
1167
1168#ifdef WE_EVENT_NETLINK
1169 /* rtnetlink event channel */
1170 rtmsg_iwinfo(dev, (char *) event, event_len);
1171#endif /* WE_EVENT_NETLINK */
1172
1173 /* Cleanup */
1174 kfree(event);
1175
1176 return; /* Always success, I guess ;-) */
1177}
1178
1179/********************** ENHANCED IWSPY SUPPORT **********************/
1180/*
1181 * In the old days, the driver was handling spy support all by itself.
1182 * Now, the driver can delegate this task to Wireless Extensions.
1183 * It needs to use those standard spy iw_handler in struct iw_handler_def,
1184 * push data to us via wireless_spy_update() and include struct iw_spy_data
1185 * in its private part (and advertise it in iw_handler_def->spy_offset).
1186 * One of the main advantage of centralising spy support here is that
1187 * it becomes much easier to improve and extend it without having to touch
1188 * the drivers. One example is the addition of the Spy-Threshold events.
1189 */
1190
1191/* ---------------------------------------------------------------- */
1192/*
1193 * Return the pointer to the spy data in the driver.
1194 * Because this is called on the Rx path via wireless_spy_update(),
1195 * we want it to be efficient...
1196 */
1197static inline struct iw_spy_data * get_spydata(struct net_device *dev)
1198{
1199 /* This is the new way */
1200 if(dev->wireless_data)
1201 return(dev->wireless_data->spy_data);
1202
1203 /* This is the old way. Doesn't work for multi-headed drivers.
1204 * It will be removed in the next version of WE. */
1205 return (dev->priv + dev->wireless_handlers->spy_offset);
1206}
1207
1208/*------------------------------------------------------------------*/
1209/*
1210 * Standard Wireless Handler : set Spy List
1211 */
1212int iw_handler_set_spy(struct net_device * dev,
1213 struct iw_request_info * info,
1214 union iwreq_data * wrqu,
1215 char * extra)
1216{
1217 struct iw_spy_data * spydata = get_spydata(dev);
1218 struct sockaddr * address = (struct sockaddr *) extra;
1219
1220 if(!dev->wireless_data)
1221 /* Help user know that driver needs updating */
1222 printk(KERN_DEBUG "%s (WE) : Driver using old/buggy spy support, please fix driver !\n",
1223 dev->name);
1224 /* Make sure driver is not buggy or using the old API */
1225 if(!spydata)
1226 return -EOPNOTSUPP;
1227
1228 /* Disable spy collection while we copy the addresses.
1229 * While we copy addresses, any call to wireless_spy_update()
1230 * will NOP. This is OK, as anyway the addresses are changing. */
1231 spydata->spy_number = 0;
1232
1233 /* We want to operate without locking, because wireless_spy_update()
1234 * most likely will happen in the interrupt handler, and therefore
1235 * have its own locking constraints and needs performance.
1236 * The rtnl_lock() make sure we don't race with the other iw_handlers.
1237 * This make sure wireless_spy_update() "see" that the spy list
1238 * is temporarily disabled. */
1239 wmb();
1240
1241 /* Are there are addresses to copy? */
1242 if(wrqu->data.length > 0) {
1243 int i;
1244
1245 /* Copy addresses */
1246 for(i = 0; i < wrqu->data.length; i++)
1247 memcpy(spydata->spy_address[i], address[i].sa_data,
1248 ETH_ALEN);
1249 /* Reset stats */
1250 memset(spydata->spy_stat, 0,
1251 sizeof(struct iw_quality) * IW_MAX_SPY);
1252
1253#ifdef WE_SPY_DEBUG
1254 printk(KERN_DEBUG "iw_handler_set_spy() : offset %ld, spydata %p, num %d\n", dev->wireless_handlers->spy_offset, spydata, wrqu->data.length);
1255 for (i = 0; i < wrqu->data.length; i++)
1256 printk(KERN_DEBUG
1257 "%02X:%02X:%02X:%02X:%02X:%02X \n",
1258 spydata->spy_address[i][0],
1259 spydata->spy_address[i][1],
1260 spydata->spy_address[i][2],
1261 spydata->spy_address[i][3],
1262 spydata->spy_address[i][4],
1263 spydata->spy_address[i][5]);
1264#endif /* WE_SPY_DEBUG */
1265 }
1266
1267 /* Make sure above is updated before re-enabling */
1268 wmb();
1269
1270 /* Enable addresses */
1271 spydata->spy_number = wrqu->data.length;
1272
1273 return 0;
1274}
1275
1276/*------------------------------------------------------------------*/
1277/*
1278 * Standard Wireless Handler : get Spy List
1279 */
1280int iw_handler_get_spy(struct net_device * dev,
1281 struct iw_request_info * info,
1282 union iwreq_data * wrqu,
1283 char * extra)
1284{
1285 struct iw_spy_data * spydata = get_spydata(dev);
1286 struct sockaddr * address = (struct sockaddr *) extra;
1287 int i;
1288
1289 /* Make sure driver is not buggy or using the old API */
1290 if(!spydata)
1291 return -EOPNOTSUPP;
1292
1293 wrqu->data.length = spydata->spy_number;
1294
1295 /* Copy addresses. */
1296 for(i = 0; i < spydata->spy_number; i++) {
1297 memcpy(address[i].sa_data, spydata->spy_address[i], ETH_ALEN);
1298 address[i].sa_family = AF_UNIX;
1299 }
1300 /* Copy stats to the user buffer (just after). */
1301 if(spydata->spy_number > 0)
1302 memcpy(extra + (sizeof(struct sockaddr) *spydata->spy_number),
1303 spydata->spy_stat,
1304 sizeof(struct iw_quality) * spydata->spy_number);
1305 /* Reset updated flags. */
1306 for(i = 0; i < spydata->spy_number; i++)
1307 spydata->spy_stat[i].updated = 0;
1308 return 0;
1309}
1310
1311/*------------------------------------------------------------------*/
1312/*
1313 * Standard Wireless Handler : set spy threshold
1314 */
1315int iw_handler_set_thrspy(struct net_device * dev,
1316 struct iw_request_info *info,
1317 union iwreq_data * wrqu,
1318 char * extra)
1319{
1320 struct iw_spy_data * spydata = get_spydata(dev);
1321 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
1322
1323 /* Make sure driver is not buggy or using the old API */
1324 if(!spydata)
1325 return -EOPNOTSUPP;
1326
1327 /* Just do it */
1328 memcpy(&(spydata->spy_thr_low), &(threshold->low),
1329 2 * sizeof(struct iw_quality));
1330
1331 /* Clear flag */
1332 memset(spydata->spy_thr_under, '\0', sizeof(spydata->spy_thr_under));
1333
1334#ifdef WE_SPY_DEBUG
1335 printk(KERN_DEBUG "iw_handler_set_thrspy() : low %d ; high %d\n", spydata->spy_thr_low.level, spydata->spy_thr_high.level);
1336#endif /* WE_SPY_DEBUG */
1337
1338 return 0;
1339}
1340
1341/*------------------------------------------------------------------*/
1342/*
1343 * Standard Wireless Handler : get spy threshold
1344 */
1345int iw_handler_get_thrspy(struct net_device * dev,
1346 struct iw_request_info *info,
1347 union iwreq_data * wrqu,
1348 char * extra)
1349{
1350 struct iw_spy_data * spydata = get_spydata(dev);
1351 struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
1352
1353 /* Make sure driver is not buggy or using the old API */
1354 if(!spydata)
1355 return -EOPNOTSUPP;
1356
1357 /* Just do it */
1358 memcpy(&(threshold->low), &(spydata->spy_thr_low),
1359 2 * sizeof(struct iw_quality));
1360
1361 return 0;
1362}
1363
1364/*------------------------------------------------------------------*/
1365/*
1366 * Prepare and send a Spy Threshold event
1367 */
1368static void iw_send_thrspy_event(struct net_device * dev,
1369 struct iw_spy_data * spydata,
1370 unsigned char * address,
1371 struct iw_quality * wstats)
1372{
1373 union iwreq_data wrqu;
1374 struct iw_thrspy threshold;
1375
1376 /* Init */
1377 wrqu.data.length = 1;
1378 wrqu.data.flags = 0;
1379 /* Copy address */
1380 memcpy(threshold.addr.sa_data, address, ETH_ALEN);
1381 threshold.addr.sa_family = ARPHRD_ETHER;
1382 /* Copy stats */
1383 memcpy(&(threshold.qual), wstats, sizeof(struct iw_quality));
1384 /* Copy also thresholds */
1385 memcpy(&(threshold.low), &(spydata->spy_thr_low),
1386 2 * sizeof(struct iw_quality));
1387
1388#ifdef WE_SPY_DEBUG
1389 printk(KERN_DEBUG "iw_send_thrspy_event() : address %02X:%02X:%02X:%02X:%02X:%02X, level %d, up = %d\n",
1390 threshold.addr.sa_data[0],
1391 threshold.addr.sa_data[1],
1392 threshold.addr.sa_data[2],
1393 threshold.addr.sa_data[3],
1394 threshold.addr.sa_data[4],
1395 threshold.addr.sa_data[5], threshold.qual.level);
1396#endif /* WE_SPY_DEBUG */
1397
1398 /* Send event to user space */
1399 wireless_send_event(dev, SIOCGIWTHRSPY, &wrqu, (char *) &threshold);
1400}
1401
1402/* ---------------------------------------------------------------- */
1403/*
1404 * Call for the driver to update the spy data.
1405 * For now, the spy data is a simple array. As the size of the array is
1406 * small, this is good enough. If we wanted to support larger number of
1407 * spy addresses, we should use something more efficient...
1408 */
1409void wireless_spy_update(struct net_device * dev,
1410 unsigned char * address,
1411 struct iw_quality * wstats)
1412{
1413 struct iw_spy_data * spydata = get_spydata(dev);
1414 int i;
1415 int match = -1;
1416
1417 /* Make sure driver is not buggy or using the old API */
1418 if(!spydata)
1419 return;
1420
1421#ifdef WE_SPY_DEBUG
1422 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]);
1423#endif /* WE_SPY_DEBUG */
1424
1425 /* Update all records that match */
1426 for(i = 0; i < spydata->spy_number; i++)
1427 if(!memcmp(address, spydata->spy_address[i], ETH_ALEN)) {
1428 memcpy(&(spydata->spy_stat[i]), wstats,
1429 sizeof(struct iw_quality));
1430 match = i;
1431 }
1432
1433 /* Generate an event if we cross the spy threshold.
1434 * To avoid event storms, we have a simple hysteresis : we generate
1435 * event only when we go under the low threshold or above the
1436 * high threshold. */
1437 if(match >= 0) {
1438 if(spydata->spy_thr_under[match]) {
1439 if(wstats->level > spydata->spy_thr_high.level) {
1440 spydata->spy_thr_under[match] = 0;
1441 iw_send_thrspy_event(dev, spydata,
1442 address, wstats);
1443 }
1444 } else {
1445 if(wstats->level < spydata->spy_thr_low.level) {
1446 spydata->spy_thr_under[match] = 1;
1447 iw_send_thrspy_event(dev, spydata,
1448 address, wstats);
1449 }
1450 }
1451 }
1452}
1453
1454EXPORT_SYMBOL(iw_handler_get_spy);
1455EXPORT_SYMBOL(iw_handler_get_thrspy);
1456EXPORT_SYMBOL(iw_handler_set_spy);
1457EXPORT_SYMBOL(iw_handler_set_thrspy);
1458EXPORT_SYMBOL(wireless_send_event);
1459EXPORT_SYMBOL(wireless_spy_update);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-04 20:11:08 -0500