Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * This file implement the Wireless Extensions APIs. | |
3 | * | |
4 | * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com> | |
c2805fbb | 5 | * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved. |
1da177e4 LT |
6 | * |
7 | * (As all part of the Linux kernel, this file is GPL) | |
8 | */ | |
9 | ||
10 | /************************** DOCUMENTATION **************************/ | |
11 | /* | |
12 | * API definition : | |
13 | * -------------- | |
14 | * See <linux/wireless.h> for details of the APIs and the rest. | |
15 | * | |
16 | * History : | |
17 | * ------- | |
18 | * | |
19 | * v1 - 5.12.01 - Jean II | |
20 | * o Created this file. | |
21 | * | |
22 | * v2 - 13.12.01 - Jean II | |
23 | * o Move /proc/net/wireless stuff from net/core/dev.c to here | |
24 | * o Make Wireless Extension IOCTLs go through here | |
25 | * o Added iw_handler handling ;-) | |
26 | * o Added standard ioctl description | |
27 | * o Initial dumb commit strategy based on orinoco.c | |
28 | * | |
29 | * v3 - 19.12.01 - Jean II | |
30 | * o Make sure we don't go out of standard_ioctl[] in ioctl_standard_call | |
31 | * o Add event dispatcher function | |
32 | * o Add event description | |
33 | * o Propagate events as rtnetlink IFLA_WIRELESS option | |
34 | * o Generate event on selected SET requests | |
35 | * | |
36 | * v4 - 18.04.02 - Jean II | |
37 | * o Fix stupid off by one in iw_ioctl_description : IW_ESSID_MAX_SIZE + 1 | |
38 | * | |
39 | * v5 - 21.06.02 - Jean II | |
40 | * o Add IW_PRIV_TYPE_ADDR in priv_type_size (+cleanup) | |
41 | * o Reshuffle IW_HEADER_TYPE_XXX to map IW_PRIV_TYPE_XXX changes | |
42 | * o Add IWEVCUSTOM for driver specific event/scanning token | |
43 | * o Turn on WE_STRICT_WRITE by default + kernel warning | |
44 | * o Fix WE_STRICT_WRITE in ioctl_export_private() (32 => iw_num) | |
45 | * o Fix off-by-one in test (extra_size <= IFNAMSIZ) | |
46 | * | |
47 | * v6 - 9.01.03 - Jean II | |
48 | * o Add common spy support : iw_handler_set_spy(), wireless_spy_update() | |
49 | * o Add enhanced spy support : iw_handler_set_thrspy() and event. | |
50 | * o Add WIRELESS_EXT version display in /proc/net/wireless | |
51 | * | |
52 | * v6 - 18.06.04 - Jean II | |
53 | * o Change get_spydata() method for added safety | |
54 | * o Remove spy #ifdef, they are always on -> cleaner code | |
55 | * o Allow any size GET request if user specifies length > max | |
56 | * and if request has IW_DESCR_FLAG_NOMAX flag or is SIOCGIWPRIV | |
57 | * o Start migrating get_wireless_stats to struct iw_handler_def | |
58 | * o Add wmb() in iw_handler_set_spy() for non-coherent archs/cpus | |
59 | * Based on patch from Pavel Roskin <proski@gnu.org> : | |
60 | * o Fix kernel data leak to user space in private handler handling | |
6582c164 JT |
61 | * |
62 | * v7 - 18.3.05 - Jean II | |
63 | * o Remove (struct iw_point *)->pointer from events and streams | |
64 | * o Remove spy_offset from struct iw_handler_def | |
65 | * o Start deprecating dev->get_wireless_stats, output a warning | |
66 | * o If IW_QUAL_DBM is set, show dBm values in /proc/net/wireless | |
67 | * o Don't loose INVALID/DBM flags when clearing UPDATED flags (iwstats) | |
711e2c33 JT |
68 | * |
69 | * v8 - 17.02.06 - Jean II | |
70 | * o RtNetlink requests support (SET/GET) | |
baef1865 JL |
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() | |
c2805fbb JT |
79 | * |
80 | * v10 - 16.3.07 - Jean II | |
81 | * o Prevent leaking of kernel space in stream on 64 bits. | |
1da177e4 LT |
82 | */ |
83 | ||
84 | /***************************** INCLUDES *****************************/ | |
85 | ||
1da177e4 LT |
86 | #include <linux/module.h> |
87 | #include <linux/types.h> /* off_t */ | |
88 | #include <linux/netdevice.h> /* struct ifreq, dev_get_by_name() */ | |
89 | #include <linux/proc_fs.h> | |
90 | #include <linux/rtnetlink.h> /* rtnetlink stuff */ | |
91 | #include <linux/seq_file.h> | |
92 | #include <linux/init.h> /* for __init */ | |
93 | #include <linux/if_arp.h> /* ARPHRD_ETHER */ | |
9819d85c | 94 | #include <linux/etherdevice.h> /* compare_ether_addr */ |
782a6675 | 95 | #include <linux/interrupt.h> |
457c4cbc | 96 | #include <net/net_namespace.h> |
1da177e4 LT |
97 | |
98 | #include <linux/wireless.h> /* Pretty obvious */ | |
99 | #include <net/iw_handler.h> /* New driver API */ | |
bd5785ba | 100 | #include <net/netlink.h> |
295f4a1f | 101 | #include <net/wext.h> |
1da177e4 LT |
102 | |
103 | #include <asm/uaccess.h> /* copy_to_user() */ | |
104 | ||
1da177e4 LT |
105 | /************************* GLOBAL VARIABLES *************************/ |
106 | /* | |
107 | * You should not use global variables, because of re-entrancy. | |
108 | * On our case, it's only const, so it's OK... | |
109 | */ | |
110 | /* | |
111 | * Meta-data about all the standard Wireless Extension request we | |
112 | * know about. | |
113 | */ | |
114 | static const struct iw_ioctl_description standard_ioctl[] = { | |
115 | [SIOCSIWCOMMIT - SIOCIWFIRST] = { | |
116 | .header_type = IW_HEADER_TYPE_NULL, | |
117 | }, | |
118 | [SIOCGIWNAME - SIOCIWFIRST] = { | |
119 | .header_type = IW_HEADER_TYPE_CHAR, | |
120 | .flags = IW_DESCR_FLAG_DUMP, | |
121 | }, | |
122 | [SIOCSIWNWID - SIOCIWFIRST] = { | |
123 | .header_type = IW_HEADER_TYPE_PARAM, | |
124 | .flags = IW_DESCR_FLAG_EVENT, | |
125 | }, | |
126 | [SIOCGIWNWID - SIOCIWFIRST] = { | |
127 | .header_type = IW_HEADER_TYPE_PARAM, | |
128 | .flags = IW_DESCR_FLAG_DUMP, | |
129 | }, | |
130 | [SIOCSIWFREQ - SIOCIWFIRST] = { | |
131 | .header_type = IW_HEADER_TYPE_FREQ, | |
132 | .flags = IW_DESCR_FLAG_EVENT, | |
133 | }, | |
134 | [SIOCGIWFREQ - SIOCIWFIRST] = { | |
135 | .header_type = IW_HEADER_TYPE_FREQ, | |
136 | .flags = IW_DESCR_FLAG_DUMP, | |
137 | }, | |
138 | [SIOCSIWMODE - SIOCIWFIRST] = { | |
139 | .header_type = IW_HEADER_TYPE_UINT, | |
140 | .flags = IW_DESCR_FLAG_EVENT, | |
141 | }, | |
142 | [SIOCGIWMODE - SIOCIWFIRST] = { | |
143 | .header_type = IW_HEADER_TYPE_UINT, | |
144 | .flags = IW_DESCR_FLAG_DUMP, | |
145 | }, | |
146 | [SIOCSIWSENS - SIOCIWFIRST] = { | |
147 | .header_type = IW_HEADER_TYPE_PARAM, | |
148 | }, | |
149 | [SIOCGIWSENS - SIOCIWFIRST] = { | |
150 | .header_type = IW_HEADER_TYPE_PARAM, | |
151 | }, | |
152 | [SIOCSIWRANGE - SIOCIWFIRST] = { | |
153 | .header_type = IW_HEADER_TYPE_NULL, | |
154 | }, | |
155 | [SIOCGIWRANGE - SIOCIWFIRST] = { | |
156 | .header_type = IW_HEADER_TYPE_POINT, | |
157 | .token_size = 1, | |
158 | .max_tokens = sizeof(struct iw_range), | |
159 | .flags = IW_DESCR_FLAG_DUMP, | |
160 | }, | |
161 | [SIOCSIWPRIV - SIOCIWFIRST] = { | |
162 | .header_type = IW_HEADER_TYPE_NULL, | |
163 | }, | |
164 | [SIOCGIWPRIV - SIOCIWFIRST] = { /* (handled directly by us) */ | |
711e2c33 JT |
165 | .header_type = IW_HEADER_TYPE_POINT, |
166 | .token_size = sizeof(struct iw_priv_args), | |
167 | .max_tokens = 16, | |
168 | .flags = IW_DESCR_FLAG_NOMAX, | |
1da177e4 LT |
169 | }, |
170 | [SIOCSIWSTATS - SIOCIWFIRST] = { | |
171 | .header_type = IW_HEADER_TYPE_NULL, | |
172 | }, | |
173 | [SIOCGIWSTATS - SIOCIWFIRST] = { /* (handled directly by us) */ | |
711e2c33 JT |
174 | .header_type = IW_HEADER_TYPE_POINT, |
175 | .token_size = 1, | |
176 | .max_tokens = sizeof(struct iw_statistics), | |
1da177e4 LT |
177 | .flags = IW_DESCR_FLAG_DUMP, |
178 | }, | |
179 | [SIOCSIWSPY - SIOCIWFIRST] = { | |
180 | .header_type = IW_HEADER_TYPE_POINT, | |
181 | .token_size = sizeof(struct sockaddr), | |
182 | .max_tokens = IW_MAX_SPY, | |
183 | }, | |
184 | [SIOCGIWSPY - SIOCIWFIRST] = { | |
185 | .header_type = IW_HEADER_TYPE_POINT, | |
186 | .token_size = sizeof(struct sockaddr) + | |
187 | sizeof(struct iw_quality), | |
188 | .max_tokens = IW_MAX_SPY, | |
189 | }, | |
190 | [SIOCSIWTHRSPY - SIOCIWFIRST] = { | |
191 | .header_type = IW_HEADER_TYPE_POINT, | |
192 | .token_size = sizeof(struct iw_thrspy), | |
193 | .min_tokens = 1, | |
194 | .max_tokens = 1, | |
195 | }, | |
196 | [SIOCGIWTHRSPY - SIOCIWFIRST] = { | |
197 | .header_type = IW_HEADER_TYPE_POINT, | |
198 | .token_size = sizeof(struct iw_thrspy), | |
199 | .min_tokens = 1, | |
200 | .max_tokens = 1, | |
201 | }, | |
202 | [SIOCSIWAP - SIOCIWFIRST] = { | |
203 | .header_type = IW_HEADER_TYPE_ADDR, | |
204 | }, | |
205 | [SIOCGIWAP - SIOCIWFIRST] = { | |
206 | .header_type = IW_HEADER_TYPE_ADDR, | |
207 | .flags = IW_DESCR_FLAG_DUMP, | |
208 | }, | |
fff9cfd9 | 209 | [SIOCSIWMLME - SIOCIWFIRST] = { |
210 | .header_type = IW_HEADER_TYPE_POINT, | |
211 | .token_size = 1, | |
212 | .min_tokens = sizeof(struct iw_mlme), | |
213 | .max_tokens = sizeof(struct iw_mlme), | |
214 | }, | |
1da177e4 LT |
215 | [SIOCGIWAPLIST - SIOCIWFIRST] = { |
216 | .header_type = IW_HEADER_TYPE_POINT, | |
217 | .token_size = sizeof(struct sockaddr) + | |
218 | sizeof(struct iw_quality), | |
219 | .max_tokens = IW_MAX_AP, | |
220 | .flags = IW_DESCR_FLAG_NOMAX, | |
221 | }, | |
222 | [SIOCSIWSCAN - SIOCIWFIRST] = { | |
fff9cfd9 | 223 | .header_type = IW_HEADER_TYPE_POINT, |
224 | .token_size = 1, | |
225 | .min_tokens = 0, | |
226 | .max_tokens = sizeof(struct iw_scan_req), | |
1da177e4 LT |
227 | }, |
228 | [SIOCGIWSCAN - SIOCIWFIRST] = { | |
229 | .header_type = IW_HEADER_TYPE_POINT, | |
230 | .token_size = 1, | |
231 | .max_tokens = IW_SCAN_MAX_DATA, | |
232 | .flags = IW_DESCR_FLAG_NOMAX, | |
233 | }, | |
234 | [SIOCSIWESSID - SIOCIWFIRST] = { | |
235 | .header_type = IW_HEADER_TYPE_POINT, | |
236 | .token_size = 1, | |
baef1865 | 237 | .max_tokens = IW_ESSID_MAX_SIZE, |
1da177e4 LT |
238 | .flags = IW_DESCR_FLAG_EVENT, |
239 | }, | |
240 | [SIOCGIWESSID - SIOCIWFIRST] = { | |
241 | .header_type = IW_HEADER_TYPE_POINT, | |
242 | .token_size = 1, | |
baef1865 | 243 | .max_tokens = IW_ESSID_MAX_SIZE, |
1da177e4 LT |
244 | .flags = IW_DESCR_FLAG_DUMP, |
245 | }, | |
246 | [SIOCSIWNICKN - SIOCIWFIRST] = { | |
247 | .header_type = IW_HEADER_TYPE_POINT, | |
248 | .token_size = 1, | |
baef1865 | 249 | .max_tokens = IW_ESSID_MAX_SIZE, |
1da177e4 LT |
250 | }, |
251 | [SIOCGIWNICKN - SIOCIWFIRST] = { | |
252 | .header_type = IW_HEADER_TYPE_POINT, | |
253 | .token_size = 1, | |
baef1865 | 254 | .max_tokens = IW_ESSID_MAX_SIZE, |
1da177e4 LT |
255 | }, |
256 | [SIOCSIWRATE - SIOCIWFIRST] = { | |
257 | .header_type = IW_HEADER_TYPE_PARAM, | |
258 | }, | |
259 | [SIOCGIWRATE - SIOCIWFIRST] = { | |
260 | .header_type = IW_HEADER_TYPE_PARAM, | |
261 | }, | |
262 | [SIOCSIWRTS - SIOCIWFIRST] = { | |
263 | .header_type = IW_HEADER_TYPE_PARAM, | |
264 | }, | |
265 | [SIOCGIWRTS - SIOCIWFIRST] = { | |
266 | .header_type = IW_HEADER_TYPE_PARAM, | |
267 | }, | |
268 | [SIOCSIWFRAG - SIOCIWFIRST] = { | |
269 | .header_type = IW_HEADER_TYPE_PARAM, | |
270 | }, | |
271 | [SIOCGIWFRAG - SIOCIWFIRST] = { | |
272 | .header_type = IW_HEADER_TYPE_PARAM, | |
273 | }, | |
274 | [SIOCSIWTXPOW - SIOCIWFIRST] = { | |
275 | .header_type = IW_HEADER_TYPE_PARAM, | |
276 | }, | |
277 | [SIOCGIWTXPOW - SIOCIWFIRST] = { | |
278 | .header_type = IW_HEADER_TYPE_PARAM, | |
279 | }, | |
280 | [SIOCSIWRETRY - SIOCIWFIRST] = { | |
281 | .header_type = IW_HEADER_TYPE_PARAM, | |
282 | }, | |
283 | [SIOCGIWRETRY - SIOCIWFIRST] = { | |
284 | .header_type = IW_HEADER_TYPE_PARAM, | |
285 | }, | |
286 | [SIOCSIWENCODE - SIOCIWFIRST] = { | |
287 | .header_type = IW_HEADER_TYPE_POINT, | |
288 | .token_size = 1, | |
289 | .max_tokens = IW_ENCODING_TOKEN_MAX, | |
290 | .flags = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT, | |
291 | }, | |
292 | [SIOCGIWENCODE - SIOCIWFIRST] = { | |
293 | .header_type = IW_HEADER_TYPE_POINT, | |
294 | .token_size = 1, | |
295 | .max_tokens = IW_ENCODING_TOKEN_MAX, | |
296 | .flags = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT, | |
297 | }, | |
298 | [SIOCSIWPOWER - SIOCIWFIRST] = { | |
299 | .header_type = IW_HEADER_TYPE_PARAM, | |
300 | }, | |
301 | [SIOCGIWPOWER - SIOCIWFIRST] = { | |
302 | .header_type = IW_HEADER_TYPE_PARAM, | |
303 | }, | |
fff9cfd9 | 304 | [SIOCSIWGENIE - SIOCIWFIRST] = { |
305 | .header_type = IW_HEADER_TYPE_POINT, | |
306 | .token_size = 1, | |
307 | .max_tokens = IW_GENERIC_IE_MAX, | |
308 | }, | |
309 | [SIOCGIWGENIE - SIOCIWFIRST] = { | |
310 | .header_type = IW_HEADER_TYPE_POINT, | |
311 | .token_size = 1, | |
312 | .max_tokens = IW_GENERIC_IE_MAX, | |
313 | }, | |
314 | [SIOCSIWAUTH - SIOCIWFIRST] = { | |
315 | .header_type = IW_HEADER_TYPE_PARAM, | |
316 | }, | |
317 | [SIOCGIWAUTH - SIOCIWFIRST] = { | |
318 | .header_type = IW_HEADER_TYPE_PARAM, | |
319 | }, | |
320 | [SIOCSIWENCODEEXT - SIOCIWFIRST] = { | |
321 | .header_type = IW_HEADER_TYPE_POINT, | |
322 | .token_size = 1, | |
323 | .min_tokens = sizeof(struct iw_encode_ext), | |
324 | .max_tokens = sizeof(struct iw_encode_ext) + | |
325 | IW_ENCODING_TOKEN_MAX, | |
326 | }, | |
327 | [SIOCGIWENCODEEXT - SIOCIWFIRST] = { | |
328 | .header_type = IW_HEADER_TYPE_POINT, | |
329 | .token_size = 1, | |
330 | .min_tokens = sizeof(struct iw_encode_ext), | |
331 | .max_tokens = sizeof(struct iw_encode_ext) + | |
332 | IW_ENCODING_TOKEN_MAX, | |
333 | }, | |
334 | [SIOCSIWPMKSA - SIOCIWFIRST] = { | |
335 | .header_type = IW_HEADER_TYPE_POINT, | |
336 | .token_size = 1, | |
337 | .min_tokens = sizeof(struct iw_pmksa), | |
338 | .max_tokens = sizeof(struct iw_pmksa), | |
339 | }, | |
1da177e4 | 340 | }; |
1ac58ee3 | 341 | static const unsigned standard_ioctl_num = ARRAY_SIZE(standard_ioctl); |
1da177e4 LT |
342 | |
343 | /* | |
344 | * Meta-data about all the additional standard Wireless Extension events | |
345 | * we know about. | |
346 | */ | |
347 | static const struct iw_ioctl_description standard_event[] = { | |
348 | [IWEVTXDROP - IWEVFIRST] = { | |
349 | .header_type = IW_HEADER_TYPE_ADDR, | |
350 | }, | |
351 | [IWEVQUAL - IWEVFIRST] = { | |
352 | .header_type = IW_HEADER_TYPE_QUAL, | |
353 | }, | |
354 | [IWEVCUSTOM - IWEVFIRST] = { | |
355 | .header_type = IW_HEADER_TYPE_POINT, | |
356 | .token_size = 1, | |
357 | .max_tokens = IW_CUSTOM_MAX, | |
358 | }, | |
359 | [IWEVREGISTERED - IWEVFIRST] = { | |
360 | .header_type = IW_HEADER_TYPE_ADDR, | |
361 | }, | |
362 | [IWEVEXPIRED - IWEVFIRST] = { | |
4ec93edb | 363 | .header_type = IW_HEADER_TYPE_ADDR, |
1da177e4 | 364 | }, |
fff9cfd9 | 365 | [IWEVGENIE - IWEVFIRST] = { |
366 | .header_type = IW_HEADER_TYPE_POINT, | |
367 | .token_size = 1, | |
368 | .max_tokens = IW_GENERIC_IE_MAX, | |
369 | }, | |
370 | [IWEVMICHAELMICFAILURE - IWEVFIRST] = { | |
4ec93edb | 371 | .header_type = IW_HEADER_TYPE_POINT, |
fff9cfd9 | 372 | .token_size = 1, |
373 | .max_tokens = sizeof(struct iw_michaelmicfailure), | |
374 | }, | |
375 | [IWEVASSOCREQIE - IWEVFIRST] = { | |
376 | .header_type = IW_HEADER_TYPE_POINT, | |
377 | .token_size = 1, | |
378 | .max_tokens = IW_GENERIC_IE_MAX, | |
379 | }, | |
380 | [IWEVASSOCRESPIE - IWEVFIRST] = { | |
381 | .header_type = IW_HEADER_TYPE_POINT, | |
382 | .token_size = 1, | |
383 | .max_tokens = IW_GENERIC_IE_MAX, | |
384 | }, | |
385 | [IWEVPMKIDCAND - IWEVFIRST] = { | |
386 | .header_type = IW_HEADER_TYPE_POINT, | |
387 | .token_size = 1, | |
388 | .max_tokens = sizeof(struct iw_pmkid_cand), | |
389 | }, | |
1da177e4 | 390 | }; |
1ac58ee3 | 391 | static const unsigned standard_event_num = ARRAY_SIZE(standard_event); |
1da177e4 LT |
392 | |
393 | /* Size (in bytes) of the various private data types */ | |
394 | static const char iw_priv_type_size[] = { | |
395 | 0, /* IW_PRIV_TYPE_NONE */ | |
396 | 1, /* IW_PRIV_TYPE_BYTE */ | |
397 | 1, /* IW_PRIV_TYPE_CHAR */ | |
398 | 0, /* Not defined */ | |
399 | sizeof(__u32), /* IW_PRIV_TYPE_INT */ | |
400 | sizeof(struct iw_freq), /* IW_PRIV_TYPE_FLOAT */ | |
401 | sizeof(struct sockaddr), /* IW_PRIV_TYPE_ADDR */ | |
402 | 0, /* Not defined */ | |
403 | }; | |
404 | ||
405 | /* Size (in bytes) of various events */ | |
406 | static const int event_type_size[] = { | |
407 | IW_EV_LCP_LEN, /* IW_HEADER_TYPE_NULL */ | |
408 | 0, | |
409 | IW_EV_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */ | |
410 | 0, | |
411 | IW_EV_UINT_LEN, /* IW_HEADER_TYPE_UINT */ | |
412 | IW_EV_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */ | |
413 | IW_EV_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */ | |
414 | 0, | |
415 | IW_EV_POINT_LEN, /* Without variable payload */ | |
416 | IW_EV_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */ | |
417 | IW_EV_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */ | |
418 | }; | |
419 | ||
c2805fbb | 420 | |
1da177e4 LT |
421 | /************************ COMMON SUBROUTINES ************************/ |
422 | /* | |
423 | * Stuff that may be used in various place or doesn't fit in one | |
424 | * of the section below. | |
425 | */ | |
426 | ||
427 | /* ---------------------------------------------------------------- */ | |
428 | /* | |
429 | * Return the driver handler associated with a specific Wireless Extension. | |
1da177e4 | 430 | */ |
bdf51894 | 431 | static iw_handler get_handler(struct net_device *dev, unsigned int cmd) |
1da177e4 LT |
432 | { |
433 | /* Don't "optimise" the following variable, it will crash */ | |
434 | unsigned int index; /* *MUST* be unsigned */ | |
435 | ||
436 | /* Check if we have some wireless handlers defined */ | |
e71a4783 | 437 | if (dev->wireless_handlers == NULL) |
1da177e4 LT |
438 | return NULL; |
439 | ||
440 | /* Try as a standard command */ | |
441 | index = cmd - SIOCIWFIRST; | |
e71a4783 | 442 | if (index < dev->wireless_handlers->num_standard) |
1da177e4 LT |
443 | return dev->wireless_handlers->standard[index]; |
444 | ||
445 | /* Try as a private command */ | |
446 | index = cmd - SIOCIWFIRSTPRIV; | |
e71a4783 | 447 | if (index < dev->wireless_handlers->num_private) |
1da177e4 LT |
448 | return dev->wireless_handlers->private[index]; |
449 | ||
450 | /* Not found */ | |
451 | return NULL; | |
452 | } | |
453 | ||
454 | /* ---------------------------------------------------------------- */ | |
455 | /* | |
456 | * Get statistics out of the driver | |
457 | */ | |
bdf51894 | 458 | static struct iw_statistics *get_wireless_stats(struct net_device *dev) |
1da177e4 LT |
459 | { |
460 | /* New location */ | |
e71a4783 | 461 | if ((dev->wireless_handlers != NULL) && |
1da177e4 LT |
462 | (dev->wireless_handlers->get_wireless_stats != NULL)) |
463 | return dev->wireless_handlers->get_wireless_stats(dev); | |
464 | ||
6582c164 | 465 | /* Not found */ |
4d44e0df | 466 | return NULL; |
1da177e4 LT |
467 | } |
468 | ||
469 | /* ---------------------------------------------------------------- */ | |
470 | /* | |
471 | * Call the commit handler in the driver | |
472 | * (if exist and if conditions are right) | |
473 | * | |
474 | * Note : our current commit strategy is currently pretty dumb, | |
475 | * but we will be able to improve on that... | |
476 | * The goal is to try to agreagate as many changes as possible | |
477 | * before doing the commit. Drivers that will define a commit handler | |
478 | * are usually those that need a reset after changing parameters, so | |
479 | * we want to minimise the number of reset. | |
480 | * A cool idea is to use a timer : at each "set" command, we re-set the | |
481 | * timer, when the timer eventually fires, we call the driver. | |
482 | * Hopefully, more on that later. | |
483 | * | |
484 | * Also, I'm waiting to see how many people will complain about the | |
485 | * netif_running(dev) test. I'm open on that one... | |
486 | * Hopefully, the driver will remember to do a commit in "open()" ;-) | |
487 | */ | |
bdf51894 | 488 | static int call_commit_handler(struct net_device *dev) |
1da177e4 | 489 | { |
e71a4783 | 490 | if ((netif_running(dev)) && |
4d44e0df | 491 | (dev->wireless_handlers->standard[0] != NULL)) |
1da177e4 LT |
492 | /* Call the commit handler on the driver */ |
493 | return dev->wireless_handlers->standard[0](dev, NULL, | |
494 | NULL, NULL); | |
4d44e0df | 495 | else |
1da177e4 LT |
496 | return 0; /* Command completed successfully */ |
497 | } | |
498 | ||
499 | /* ---------------------------------------------------------------- */ | |
500 | /* | |
501 | * Calculate size of private arguments | |
502 | */ | |
503 | static inline int get_priv_size(__u16 args) | |
504 | { | |
505 | int num = args & IW_PRIV_SIZE_MASK; | |
506 | int type = (args & IW_PRIV_TYPE_MASK) >> 12; | |
507 | ||
508 | return num * iw_priv_type_size[type]; | |
509 | } | |
510 | ||
511 | /* ---------------------------------------------------------------- */ | |
512 | /* | |
513 | * Re-calculate the size of private arguments | |
514 | */ | |
515 | static inline int adjust_priv_size(__u16 args, | |
516 | union iwreq_data * wrqu) | |
517 | { | |
518 | int num = wrqu->data.length; | |
519 | int max = args & IW_PRIV_SIZE_MASK; | |
520 | int type = (args & IW_PRIV_TYPE_MASK) >> 12; | |
521 | ||
522 | /* Make sure the driver doesn't goof up */ | |
523 | if (max < num) | |
524 | num = max; | |
525 | ||
526 | return num * iw_priv_type_size[type]; | |
527 | } | |
528 | ||
711e2c33 JT |
529 | /* ---------------------------------------------------------------- */ |
530 | /* | |
531 | * Standard Wireless Handler : get wireless stats | |
532 | * Allow programatic access to /proc/net/wireless even if /proc | |
533 | * doesn't exist... Also more efficient... | |
534 | */ | |
535 | static int iw_handler_get_iwstats(struct net_device * dev, | |
536 | struct iw_request_info * info, | |
537 | union iwreq_data * wrqu, | |
538 | char * extra) | |
539 | { | |
540 | /* Get stats from the driver */ | |
541 | struct iw_statistics *stats; | |
542 | ||
543 | stats = get_wireless_stats(dev); | |
4d44e0df | 544 | if (stats) { |
711e2c33 JT |
545 | /* Copy statistics to extra */ |
546 | memcpy(extra, stats, sizeof(struct iw_statistics)); | |
547 | wrqu->data.length = sizeof(struct iw_statistics); | |
548 | ||
549 | /* Check if we need to clear the updated flag */ | |
e71a4783 | 550 | if (wrqu->data.flags != 0) |
711e2c33 JT |
551 | stats->qual.updated &= ~IW_QUAL_ALL_UPDATED; |
552 | return 0; | |
553 | } else | |
554 | return -EOPNOTSUPP; | |
555 | } | |
556 | ||
557 | /* ---------------------------------------------------------------- */ | |
558 | /* | |
559 | * Standard Wireless Handler : get iwpriv definitions | |
560 | * Export the driver private handler definition | |
561 | * They will be picked up by tools like iwpriv... | |
562 | */ | |
563 | static int iw_handler_get_private(struct net_device * dev, | |
564 | struct iw_request_info * info, | |
565 | union iwreq_data * wrqu, | |
566 | char * extra) | |
567 | { | |
568 | /* Check if the driver has something to export */ | |
e71a4783 | 569 | if ((dev->wireless_handlers->num_private_args == 0) || |
711e2c33 JT |
570 | (dev->wireless_handlers->private_args == NULL)) |
571 | return -EOPNOTSUPP; | |
572 | ||
573 | /* Check if there is enough buffer up there */ | |
e71a4783 | 574 | if (wrqu->data.length < dev->wireless_handlers->num_private_args) { |
711e2c33 JT |
575 | /* User space can't know in advance how large the buffer |
576 | * needs to be. Give it a hint, so that we can support | |
577 | * any size buffer we want somewhat efficiently... */ | |
578 | wrqu->data.length = dev->wireless_handlers->num_private_args; | |
579 | return -E2BIG; | |
580 | } | |
581 | ||
582 | /* Set the number of available ioctls. */ | |
583 | wrqu->data.length = dev->wireless_handlers->num_private_args; | |
584 | ||
585 | /* Copy structure to the user buffer. */ | |
586 | memcpy(extra, dev->wireless_handlers->private_args, | |
587 | sizeof(struct iw_priv_args) * wrqu->data.length); | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
1da177e4 LT |
592 | |
593 | /******************** /proc/net/wireless SUPPORT ********************/ | |
594 | /* | |
595 | * The /proc/net/wireless file is a human readable user-space interface | |
596 | * exporting various wireless specific statistics from the wireless devices. | |
597 | * This is the most popular part of the Wireless Extensions ;-) | |
598 | * | |
599 | * This interface is a pure clone of /proc/net/dev (in net/core/dev.c). | |
600 | * The content of the file is basically the content of "struct iw_statistics". | |
601 | */ | |
602 | ||
603 | #ifdef CONFIG_PROC_FS | |
604 | ||
605 | /* ---------------------------------------------------------------- */ | |
606 | /* | |
607 | * Print one entry (line) of /proc/net/wireless | |
608 | */ | |
bdf51894 JB |
609 | static void wireless_seq_printf_stats(struct seq_file *seq, |
610 | struct net_device *dev) | |
1da177e4 LT |
611 | { |
612 | /* Get stats from the driver */ | |
613 | struct iw_statistics *stats = get_wireless_stats(dev); | |
614 | ||
615 | if (stats) { | |
616 | seq_printf(seq, "%6s: %04x %3d%c %3d%c %3d%c %6d %6d %6d " | |
617 | "%6d %6d %6d\n", | |
618 | dev->name, stats->status, stats->qual.qual, | |
619 | stats->qual.updated & IW_QUAL_QUAL_UPDATED | |
620 | ? '.' : ' ', | |
4ec93edb | 621 | ((__s32) stats->qual.level) - |
6582c164 | 622 | ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0), |
1da177e4 LT |
623 | stats->qual.updated & IW_QUAL_LEVEL_UPDATED |
624 | ? '.' : ' ', | |
4ec93edb | 625 | ((__s32) stats->qual.noise) - |
6582c164 | 626 | ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0), |
1da177e4 LT |
627 | stats->qual.updated & IW_QUAL_NOISE_UPDATED |
628 | ? '.' : ' ', | |
629 | stats->discard.nwid, stats->discard.code, | |
630 | stats->discard.fragment, stats->discard.retries, | |
631 | stats->discard.misc, stats->miss.beacon); | |
6582c164 | 632 | stats->qual.updated &= ~IW_QUAL_ALL_UPDATED; |
1da177e4 LT |
633 | } |
634 | } | |
635 | ||
636 | /* ---------------------------------------------------------------- */ | |
637 | /* | |
638 | * Print info for /proc/net/wireless (print all entries) | |
639 | */ | |
640 | static int wireless_seq_show(struct seq_file *seq, void *v) | |
641 | { | |
642 | if (v == SEQ_START_TOKEN) | |
643 | seq_printf(seq, "Inter-| sta-| Quality | Discarded " | |
644 | "packets | Missed | WE\n" | |
645 | " face | tus | link level noise | nwid " | |
646 | "crypt frag retry misc | beacon | %d\n", | |
647 | WIRELESS_EXT); | |
648 | else | |
649 | wireless_seq_printf_stats(seq, v); | |
650 | return 0; | |
651 | } | |
652 | ||
f690808e | 653 | static const struct seq_operations wireless_seq_ops = { |
1da177e4 LT |
654 | .start = dev_seq_start, |
655 | .next = dev_seq_next, | |
656 | .stop = dev_seq_stop, | |
657 | .show = wireless_seq_show, | |
658 | }; | |
659 | ||
660 | static int wireless_seq_open(struct inode *inode, struct file *file) | |
661 | { | |
e372c414 DL |
662 | return seq_open_net(inode, file, &wireless_seq_ops, |
663 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
664 | } |
665 | ||
9a32144e | 666 | static const struct file_operations wireless_seq_fops = { |
1da177e4 LT |
667 | .owner = THIS_MODULE, |
668 | .open = wireless_seq_open, | |
669 | .read = seq_read, | |
670 | .llseek = seq_lseek, | |
e372c414 | 671 | .release = seq_release_net, |
1da177e4 LT |
672 | }; |
673 | ||
881d966b | 674 | int wext_proc_init(struct net *net) |
1da177e4 | 675 | { |
6582c164 | 676 | /* Create /proc/net/wireless entry */ |
881d966b | 677 | if (!proc_net_fops_create(net, "wireless", S_IRUGO, &wireless_seq_fops)) |
1da177e4 LT |
678 | return -ENOMEM; |
679 | ||
680 | return 0; | |
681 | } | |
881d966b EB |
682 | |
683 | void wext_proc_exit(struct net *net) | |
684 | { | |
685 | proc_net_remove(net, "wireless"); | |
686 | } | |
1da177e4 LT |
687 | #endif /* CONFIG_PROC_FS */ |
688 | ||
689 | /************************** IOCTL SUPPORT **************************/ | |
690 | /* | |
691 | * The original user space API to configure all those Wireless Extensions | |
692 | * is through IOCTLs. | |
693 | * In there, we check if we need to call the new driver API (iw_handler) | |
694 | * or just call the driver ioctl handler. | |
695 | */ | |
696 | ||
1da177e4 LT |
697 | /* ---------------------------------------------------------------- */ |
698 | /* | |
699 | * Wrapper to call a standard Wireless Extension handler. | |
700 | * We do various checks and also take care of moving data between | |
701 | * user space and kernel space. | |
702 | */ | |
711e2c33 JT |
703 | static int ioctl_standard_call(struct net_device * dev, |
704 | struct ifreq * ifr, | |
705 | unsigned int cmd, | |
706 | iw_handler handler) | |
1da177e4 LT |
707 | { |
708 | struct iwreq * iwr = (struct iwreq *) ifr; | |
709 | const struct iw_ioctl_description * descr; | |
710 | struct iw_request_info info; | |
711 | int ret = -EINVAL; | |
712 | ||
713 | /* Get the description of the IOCTL */ | |
e71a4783 | 714 | if ((cmd - SIOCIWFIRST) >= standard_ioctl_num) |
1da177e4 LT |
715 | return -EOPNOTSUPP; |
716 | descr = &(standard_ioctl[cmd - SIOCIWFIRST]); | |
717 | ||
1da177e4 LT |
718 | /* Prepare the call */ |
719 | info.cmd = cmd; | |
720 | info.flags = 0; | |
721 | ||
722 | /* Check if we have a pointer to user space data or not */ | |
e71a4783 | 723 | if (descr->header_type != IW_HEADER_TYPE_POINT) { |
1da177e4 LT |
724 | |
725 | /* No extra arguments. Trivial to handle */ | |
726 | ret = handler(dev, &info, &(iwr->u), NULL); | |
727 | ||
1da177e4 | 728 | /* Generate an event to notify listeners of the change */ |
e71a4783 | 729 | if ((descr->flags & IW_DESCR_FLAG_EVENT) && |
1da177e4 LT |
730 | ((ret == 0) || (ret == -EIWCOMMIT))) |
731 | wireless_send_event(dev, cmd, &(iwr->u), NULL); | |
1da177e4 LT |
732 | } else { |
733 | char * extra; | |
734 | int extra_size; | |
735 | int user_length = 0; | |
736 | int err; | |
98978edb | 737 | int essid_compat = 0; |
1da177e4 LT |
738 | |
739 | /* Calculate space needed by arguments. Always allocate | |
740 | * for max space. Easier, and won't last long... */ | |
741 | extra_size = descr->max_tokens * descr->token_size; | |
742 | ||
98978edb JL |
743 | /* Check need for ESSID compatibility for WE < 21 */ |
744 | switch (cmd) { | |
745 | case SIOCSIWESSID: | |
746 | case SIOCGIWESSID: | |
747 | case SIOCSIWNICKN: | |
748 | case SIOCGIWNICKN: | |
749 | if (iwr->u.data.length == descr->max_tokens + 1) | |
750 | essid_compat = 1; | |
751 | else if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) { | |
752 | char essid[IW_ESSID_MAX_SIZE + 1]; | |
753 | ||
754 | err = copy_from_user(essid, iwr->u.data.pointer, | |
755 | iwr->u.data.length * | |
756 | descr->token_size); | |
757 | if (err) | |
758 | return -EFAULT; | |
759 | ||
760 | if (essid[iwr->u.data.length - 1] == '\0') | |
761 | essid_compat = 1; | |
762 | } | |
763 | break; | |
764 | default: | |
765 | break; | |
766 | } | |
767 | ||
768 | iwr->u.data.length -= essid_compat; | |
769 | ||
1da177e4 | 770 | /* Check what user space is giving us */ |
e71a4783 | 771 | if (IW_IS_SET(cmd)) { |
1da177e4 | 772 | /* Check NULL pointer */ |
e71a4783 | 773 | if ((iwr->u.data.pointer == NULL) && |
1da177e4 LT |
774 | (iwr->u.data.length != 0)) |
775 | return -EFAULT; | |
776 | /* Check if number of token fits within bounds */ | |
e71a4783 | 777 | if (iwr->u.data.length > descr->max_tokens) |
1da177e4 | 778 | return -E2BIG; |
e71a4783 | 779 | if (iwr->u.data.length < descr->min_tokens) |
1da177e4 LT |
780 | return -EINVAL; |
781 | } else { | |
782 | /* Check NULL pointer */ | |
e71a4783 | 783 | if (iwr->u.data.pointer == NULL) |
1da177e4 LT |
784 | return -EFAULT; |
785 | /* Save user space buffer size for checking */ | |
786 | user_length = iwr->u.data.length; | |
787 | ||
788 | /* Don't check if user_length > max to allow forward | |
789 | * compatibility. The test user_length < min is | |
790 | * implied by the test at the end. */ | |
791 | ||
792 | /* Support for very large requests */ | |
e71a4783 | 793 | if ((descr->flags & IW_DESCR_FLAG_NOMAX) && |
1da177e4 LT |
794 | (user_length > descr->max_tokens)) { |
795 | /* Allow userspace to GET more than max so | |
796 | * we can support any size GET requests. | |
797 | * There is still a limit : -ENOMEM. */ | |
798 | extra_size = user_length * descr->token_size; | |
799 | /* Note : user_length is originally a __u16, | |
800 | * and token_size is controlled by us, | |
801 | * so extra_size won't get negative and | |
802 | * won't overflow... */ | |
803 | } | |
804 | } | |
805 | ||
1da177e4 | 806 | /* Create the kernel buffer */ |
98978edb JL |
807 | /* kzalloc ensures NULL-termination for essid_compat */ |
808 | extra = kzalloc(extra_size, GFP_KERNEL); | |
4d44e0df | 809 | if (extra == NULL) |
1da177e4 | 810 | return -ENOMEM; |
1da177e4 LT |
811 | |
812 | /* If it is a SET, get all the extra data in here */ | |
e71a4783 | 813 | if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) { |
1da177e4 LT |
814 | err = copy_from_user(extra, iwr->u.data.pointer, |
815 | iwr->u.data.length * | |
816 | descr->token_size); | |
817 | if (err) { | |
818 | kfree(extra); | |
819 | return -EFAULT; | |
820 | } | |
1da177e4 LT |
821 | } |
822 | ||
823 | /* Call the handler */ | |
824 | ret = handler(dev, &info, &(iwr->u), extra); | |
825 | ||
98978edb JL |
826 | iwr->u.data.length += essid_compat; |
827 | ||
1da177e4 LT |
828 | /* If we have something to return to the user */ |
829 | if (!ret && IW_IS_GET(cmd)) { | |
830 | /* Check if there is enough buffer up there */ | |
e71a4783 | 831 | if (user_length < iwr->u.data.length) { |
1da177e4 LT |
832 | kfree(extra); |
833 | return -E2BIG; | |
834 | } | |
835 | ||
836 | err = copy_to_user(iwr->u.data.pointer, extra, | |
837 | iwr->u.data.length * | |
838 | descr->token_size); | |
839 | if (err) | |
4ec93edb | 840 | ret = -EFAULT; |
1da177e4 LT |
841 | } |
842 | ||
1da177e4 | 843 | /* Generate an event to notify listeners of the change */ |
e71a4783 | 844 | if ((descr->flags & IW_DESCR_FLAG_EVENT) && |
1da177e4 | 845 | ((ret == 0) || (ret == -EIWCOMMIT))) { |
e71a4783 | 846 | if (descr->flags & IW_DESCR_FLAG_RESTRICT) |
1da177e4 LT |
847 | /* If the event is restricted, don't |
848 | * export the payload */ | |
849 | wireless_send_event(dev, cmd, &(iwr->u), NULL); | |
850 | else | |
851 | wireless_send_event(dev, cmd, &(iwr->u), | |
852 | extra); | |
853 | } | |
1da177e4 LT |
854 | |
855 | /* Cleanup - I told you it wasn't that long ;-) */ | |
856 | kfree(extra); | |
857 | } | |
858 | ||
859 | /* Call commit handler if needed and defined */ | |
e71a4783 | 860 | if (ret == -EIWCOMMIT) |
1da177e4 LT |
861 | ret = call_commit_handler(dev); |
862 | ||
863 | /* Here, we will generate the appropriate event if needed */ | |
864 | ||
865 | return ret; | |
866 | } | |
867 | ||
868 | /* ---------------------------------------------------------------- */ | |
869 | /* | |
870 | * Wrapper to call a private Wireless Extension handler. | |
871 | * We do various checks and also take care of moving data between | |
872 | * user space and kernel space. | |
873 | * It's not as nice and slimline as the standard wrapper. The cause | |
874 | * is struct iw_priv_args, which was not really designed for the | |
875 | * job we are going here. | |
876 | * | |
877 | * IMPORTANT : This function prevent to set and get data on the same | |
878 | * IOCTL and enforce the SET/GET convention. Not doing it would be | |
879 | * far too hairy... | |
880 | * If you need to set and get data at the same time, please don't use | |
881 | * a iw_handler but process it in your ioctl handler (i.e. use the | |
882 | * old driver API). | |
883 | */ | |
bdf51894 JB |
884 | static int ioctl_private_call(struct net_device *dev, struct ifreq *ifr, |
885 | unsigned int cmd, iw_handler handler) | |
1da177e4 LT |
886 | { |
887 | struct iwreq * iwr = (struct iwreq *) ifr; | |
888 | const struct iw_priv_args * descr = NULL; | |
889 | struct iw_request_info info; | |
890 | int extra_size = 0; | |
891 | int i; | |
892 | int ret = -EINVAL; | |
893 | ||
894 | /* Get the description of the IOCTL */ | |
e71a4783 SH |
895 | for (i = 0; i < dev->wireless_handlers->num_private_args; i++) |
896 | if (cmd == dev->wireless_handlers->private_args[i].cmd) { | |
1da177e4 LT |
897 | descr = &(dev->wireless_handlers->private_args[i]); |
898 | break; | |
899 | } | |
900 | ||
1da177e4 | 901 | /* Compute the size of the set/get arguments */ |
e71a4783 SH |
902 | if (descr != NULL) { |
903 | if (IW_IS_SET(cmd)) { | |
1da177e4 LT |
904 | int offset = 0; /* For sub-ioctls */ |
905 | /* Check for sub-ioctl handler */ | |
e71a4783 | 906 | if (descr->name[0] == '\0') |
1da177e4 LT |
907 | /* Reserve one int for sub-ioctl index */ |
908 | offset = sizeof(__u32); | |
909 | ||
910 | /* Size of set arguments */ | |
911 | extra_size = get_priv_size(descr->set_args); | |
912 | ||
913 | /* Does it fits in iwr ? */ | |
e71a4783 | 914 | if ((descr->set_args & IW_PRIV_SIZE_FIXED) && |
1da177e4 LT |
915 | ((extra_size + offset) <= IFNAMSIZ)) |
916 | extra_size = 0; | |
917 | } else { | |
918 | /* Size of get arguments */ | |
919 | extra_size = get_priv_size(descr->get_args); | |
920 | ||
921 | /* Does it fits in iwr ? */ | |
e71a4783 | 922 | if ((descr->get_args & IW_PRIV_SIZE_FIXED) && |
1da177e4 LT |
923 | (extra_size <= IFNAMSIZ)) |
924 | extra_size = 0; | |
925 | } | |
926 | } | |
927 | ||
928 | /* Prepare the call */ | |
929 | info.cmd = cmd; | |
930 | info.flags = 0; | |
931 | ||
932 | /* Check if we have a pointer to user space data or not. */ | |
e71a4783 | 933 | if (extra_size == 0) { |
1da177e4 LT |
934 | /* No extra arguments. Trivial to handle */ |
935 | ret = handler(dev, &info, &(iwr->u), (char *) &(iwr->u)); | |
936 | } else { | |
937 | char * extra; | |
938 | int err; | |
939 | ||
940 | /* Check what user space is giving us */ | |
e71a4783 | 941 | if (IW_IS_SET(cmd)) { |
1da177e4 | 942 | /* Check NULL pointer */ |
e71a4783 | 943 | if ((iwr->u.data.pointer == NULL) && |
1da177e4 LT |
944 | (iwr->u.data.length != 0)) |
945 | return -EFAULT; | |
946 | ||
947 | /* Does it fits within bounds ? */ | |
e71a4783 | 948 | if (iwr->u.data.length > (descr->set_args & |
1da177e4 LT |
949 | IW_PRIV_SIZE_MASK)) |
950 | return -E2BIG; | |
4d44e0df JB |
951 | } else if (iwr->u.data.pointer == NULL) |
952 | return -EFAULT; | |
1da177e4 | 953 | |
1da177e4 LT |
954 | /* Always allocate for max space. Easier, and won't last |
955 | * long... */ | |
956 | extra = kmalloc(extra_size, GFP_KERNEL); | |
4d44e0df | 957 | if (extra == NULL) |
1da177e4 | 958 | return -ENOMEM; |
1da177e4 LT |
959 | |
960 | /* If it is a SET, get all the extra data in here */ | |
e71a4783 | 961 | if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) { |
1da177e4 LT |
962 | err = copy_from_user(extra, iwr->u.data.pointer, |
963 | extra_size); | |
964 | if (err) { | |
965 | kfree(extra); | |
966 | return -EFAULT; | |
967 | } | |
1da177e4 LT |
968 | } |
969 | ||
970 | /* Call the handler */ | |
971 | ret = handler(dev, &info, &(iwr->u), extra); | |
972 | ||
973 | /* If we have something to return to the user */ | |
974 | if (!ret && IW_IS_GET(cmd)) { | |
975 | ||
976 | /* Adjust for the actual length if it's variable, | |
977 | * avoid leaking kernel bits outside. */ | |
978 | if (!(descr->get_args & IW_PRIV_SIZE_FIXED)) { | |
979 | extra_size = adjust_priv_size(descr->get_args, | |
980 | &(iwr->u)); | |
981 | } | |
982 | ||
983 | err = copy_to_user(iwr->u.data.pointer, extra, | |
984 | extra_size); | |
985 | if (err) | |
4ec93edb | 986 | ret = -EFAULT; |
1da177e4 LT |
987 | } |
988 | ||
989 | /* Cleanup - I told you it wasn't that long ;-) */ | |
990 | kfree(extra); | |
991 | } | |
992 | ||
993 | ||
994 | /* Call commit handler if needed and defined */ | |
e71a4783 | 995 | if (ret == -EIWCOMMIT) |
1da177e4 LT |
996 | ret = call_commit_handler(dev); |
997 | ||
998 | return ret; | |
999 | } | |
1000 | ||
1001 | /* ---------------------------------------------------------------- */ | |
1002 | /* | |
295f4a1f | 1003 | * Main IOCTl dispatcher. |
1da177e4 LT |
1004 | * Check the type of IOCTL and call the appropriate wrapper... |
1005 | */ | |
881d966b | 1006 | static int wireless_process_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd) |
1da177e4 LT |
1007 | { |
1008 | struct net_device *dev; | |
1009 | iw_handler handler; | |
1010 | ||
1011 | /* Permissions are already checked in dev_ioctl() before calling us. | |
1012 | * The copy_to/from_user() of ifr is also dealt with in there */ | |
1013 | ||
1014 | /* Make sure the device exist */ | |
881d966b | 1015 | if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL) |
1da177e4 LT |
1016 | return -ENODEV; |
1017 | ||
1018 | /* A bunch of special cases, then the generic case... | |
1019 | * Note that 'cmd' is already filtered in dev_ioctl() with | |
1020 | * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */ | |
dd8ceabc JB |
1021 | if (cmd == SIOCGIWSTATS) |
1022 | return ioctl_standard_call(dev, ifr, cmd, | |
e71a4783 SH |
1023 | &iw_handler_get_iwstats); |
1024 | ||
dd8ceabc JB |
1025 | if (cmd == SIOCGIWPRIV && dev->wireless_handlers) |
1026 | return ioctl_standard_call(dev, ifr, cmd, | |
1027 | &iw_handler_get_private); | |
1028 | ||
1029 | /* Basic check */ | |
1030 | if (!netif_device_present(dev)) | |
1031 | return -ENODEV; | |
1032 | ||
1033 | /* New driver API : try to find the handler */ | |
1034 | handler = get_handler(dev, cmd); | |
1035 | if (handler) { | |
1036 | /* Standard and private are not the same */ | |
1037 | if (cmd < SIOCIWFIRSTPRIV) | |
1038 | return ioctl_standard_call(dev, ifr, cmd, handler); | |
1039 | else | |
1040 | return ioctl_private_call(dev, ifr, cmd, handler); | |
1da177e4 | 1041 | } |
dd8ceabc JB |
1042 | /* Old driver API : call driver ioctl handler */ |
1043 | if (dev->do_ioctl) | |
1044 | return dev->do_ioctl(dev, ifr, cmd); | |
1045 | return -EOPNOTSUPP; | |
1da177e4 LT |
1046 | } |
1047 | ||
295f4a1f | 1048 | /* entry point from dev ioctl */ |
881d966b | 1049 | int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd, |
295f4a1f JB |
1050 | void __user *arg) |
1051 | { | |
1052 | int ret; | |
1053 | ||
1054 | /* If command is `set a parameter', or | |
1055 | * `get the encoding parameters', check if | |
1056 | * the user has the right to do it */ | |
dd8ceabc JB |
1057 | if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE || cmd == SIOCGIWENCODEEXT) |
1058 | && !capable(CAP_NET_ADMIN)) | |
1059 | return -EPERM; | |
1060 | ||
881d966b | 1061 | dev_load(net, ifr->ifr_name); |
295f4a1f | 1062 | rtnl_lock(); |
881d966b | 1063 | ret = wireless_process_ioctl(net, ifr, cmd); |
295f4a1f | 1064 | rtnl_unlock(); |
0a06ea87 | 1065 | if (IW_IS_GET(cmd) && copy_to_user(arg, ifr, sizeof(struct iwreq))) |
295f4a1f JB |
1066 | return -EFAULT; |
1067 | return ret; | |
1068 | } | |
711e2c33 | 1069 | |
1da177e4 LT |
1070 | /************************* EVENT PROCESSING *************************/ |
1071 | /* | |
1072 | * Process events generated by the wireless layer or the driver. | |
1073 | * Most often, the event will be propagated through rtnetlink | |
1074 | */ | |
1075 | ||
baef1865 JL |
1076 | /* ---------------------------------------------------------------- */ |
1077 | /* | |
1078 | * Locking... | |
1079 | * ---------- | |
1080 | * | |
1081 | * Thanks to Herbert Xu <herbert@gondor.apana.org.au> for fixing | |
1082 | * the locking issue in here and implementing this code ! | |
1083 | * | |
1084 | * The issue : wireless_send_event() is often called in interrupt context, | |
1085 | * while the Netlink layer can never be called in interrupt context. | |
1086 | * The fully formed RtNetlink events are queued, and then a tasklet is run | |
1087 | * to feed those to Netlink. | |
1088 | * The skb_queue is interrupt safe, and its lock is not held while calling | |
1089 | * Netlink, so there is no possibility of dealock. | |
1090 | * Jean II | |
1091 | */ | |
1092 | ||
782a6675 HX |
1093 | static struct sk_buff_head wireless_nlevent_queue; |
1094 | ||
baef1865 JL |
1095 | static int __init wireless_nlevent_init(void) |
1096 | { | |
1097 | skb_queue_head_init(&wireless_nlevent_queue); | |
1098 | return 0; | |
1099 | } | |
1100 | ||
1101 | subsys_initcall(wireless_nlevent_init); | |
1102 | ||
782a6675 HX |
1103 | static void wireless_nlevent_process(unsigned long data) |
1104 | { | |
1105 | struct sk_buff *skb; | |
1106 | ||
1107 | while ((skb = skb_dequeue(&wireless_nlevent_queue))) | |
97c53cac | 1108 | rtnl_notify(skb, &init_net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); |
782a6675 HX |
1109 | } |
1110 | ||
1111 | static DECLARE_TASKLET(wireless_nlevent_tasklet, wireless_nlevent_process, 0); | |
1112 | ||
1da177e4 LT |
1113 | /* ---------------------------------------------------------------- */ |
1114 | /* | |
1115 | * Fill a rtnetlink message with our event data. | |
1116 | * Note that we propage only the specified event and don't dump the | |
1117 | * current wireless config. Dumping the wireless config is far too | |
1118 | * expensive (for each parameter, the driver need to query the hardware). | |
1119 | */ | |
bdf51894 JB |
1120 | static int rtnetlink_fill_iwinfo(struct sk_buff *skb, struct net_device *dev, |
1121 | int type, char *event, int event_len) | |
1da177e4 LT |
1122 | { |
1123 | struct ifinfomsg *r; | |
1124 | struct nlmsghdr *nlh; | |
1da177e4 | 1125 | |
744b096e TG |
1126 | nlh = nlmsg_put(skb, 0, 0, type, sizeof(*r), 0); |
1127 | if (nlh == NULL) | |
1128 | return -EMSGSIZE; | |
1129 | ||
1130 | r = nlmsg_data(nlh); | |
1da177e4 | 1131 | r->ifi_family = AF_UNSPEC; |
9ef1d4c7 | 1132 | r->__ifi_pad = 0; |
1da177e4 LT |
1133 | r->ifi_type = dev->type; |
1134 | r->ifi_index = dev->ifindex; | |
711e2c33 | 1135 | r->ifi_flags = dev_get_flags(dev); |
1da177e4 LT |
1136 | r->ifi_change = 0; /* Wireless changes don't affect those flags */ |
1137 | ||
1138 | /* Add the wireless events in the netlink packet */ | |
744b096e | 1139 | NLA_PUT(skb, IFLA_WIRELESS, event_len, event); |
1da177e4 | 1140 | |
744b096e | 1141 | return nlmsg_end(skb, nlh); |
1da177e4 | 1142 | |
744b096e TG |
1143 | nla_put_failure: |
1144 | nlmsg_cancel(skb, nlh); | |
1145 | return -EMSGSIZE; | |
1da177e4 LT |
1146 | } |
1147 | ||
1148 | /* ---------------------------------------------------------------- */ | |
1149 | /* | |
1150 | * Create and broadcast and send it on the standard rtnetlink socket | |
1151 | * This is a pure clone rtmsg_ifinfo() in net/core/rtnetlink.c | |
1152 | * Andrzej Krzysztofowicz mandated that I used a IFLA_XXX field | |
1153 | * within a RTM_NEWLINK event. | |
1154 | */ | |
bdf51894 | 1155 | static void rtmsg_iwinfo(struct net_device *dev, char *event, int event_len) |
1da177e4 LT |
1156 | { |
1157 | struct sk_buff *skb; | |
744b096e | 1158 | int err; |
1da177e4 | 1159 | |
c346dca1 | 1160 | if (dev_net(dev) != &init_net) |
97c53cac DL |
1161 | return; |
1162 | ||
744b096e | 1163 | skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); |
1da177e4 LT |
1164 | if (!skb) |
1165 | return; | |
1166 | ||
744b096e TG |
1167 | err = rtnetlink_fill_iwinfo(skb, dev, RTM_NEWLINK, event, event_len); |
1168 | if (err < 0) { | |
1169 | WARN_ON(err == -EMSGSIZE); | |
1da177e4 LT |
1170 | kfree_skb(skb); |
1171 | return; | |
1172 | } | |
744b096e | 1173 | |
ac6d439d | 1174 | NETLINK_CB(skb).dst_group = RTNLGRP_LINK; |
782a6675 HX |
1175 | skb_queue_tail(&wireless_nlevent_queue, skb); |
1176 | tasklet_schedule(&wireless_nlevent_tasklet); | |
1177 | } | |
1178 | ||
1da177e4 LT |
1179 | /* ---------------------------------------------------------------- */ |
1180 | /* | |
1181 | * Main event dispatcher. Called from other parts and drivers. | |
1182 | * Send the event on the appropriate channels. | |
1183 | * May be called from interrupt context. | |
1184 | */ | |
1185 | void wireless_send_event(struct net_device * dev, | |
1186 | unsigned int cmd, | |
1187 | union iwreq_data * wrqu, | |
1188 | char * extra) | |
1189 | { | |
1190 | const struct iw_ioctl_description * descr = NULL; | |
1191 | int extra_len = 0; | |
1192 | struct iw_event *event; /* Mallocated whole event */ | |
1193 | int event_len; /* Its size */ | |
1194 | int hdr_len; /* Size of the event header */ | |
6582c164 | 1195 | int wrqu_off = 0; /* Offset in wrqu */ |
1da177e4 LT |
1196 | /* Don't "optimise" the following variable, it will crash */ |
1197 | unsigned cmd_index; /* *MUST* be unsigned */ | |
1198 | ||
6582c164 | 1199 | /* Get the description of the Event */ |
e71a4783 | 1200 | if (cmd <= SIOCIWLAST) { |
1da177e4 | 1201 | cmd_index = cmd - SIOCIWFIRST; |
e71a4783 | 1202 | if (cmd_index < standard_ioctl_num) |
1da177e4 LT |
1203 | descr = &(standard_ioctl[cmd_index]); |
1204 | } else { | |
1205 | cmd_index = cmd - IWEVFIRST; | |
e71a4783 | 1206 | if (cmd_index < standard_event_num) |
1da177e4 LT |
1207 | descr = &(standard_event[cmd_index]); |
1208 | } | |
1209 | /* Don't accept unknown events */ | |
e71a4783 | 1210 | if (descr == NULL) { |
1da177e4 LT |
1211 | /* Note : we don't return an error to the driver, because |
1212 | * the driver would not know what to do about it. It can't | |
1213 | * return an error to the user, because the event is not | |
1214 | * initiated by a user request. | |
1215 | * The best the driver could do is to log an error message. | |
1216 | * We will do it ourselves instead... | |
1217 | */ | |
4ec93edb | 1218 | printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n", |
1da177e4 LT |
1219 | dev->name, cmd); |
1220 | return; | |
1221 | } | |
1da177e4 LT |
1222 | |
1223 | /* Check extra parameters and set extra_len */ | |
e71a4783 | 1224 | if (descr->header_type == IW_HEADER_TYPE_POINT) { |
1da177e4 | 1225 | /* Check if number of token fits within bounds */ |
e71a4783 | 1226 | if (wrqu->data.length > descr->max_tokens) { |
4ec93edb | 1227 | printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length); |
1da177e4 LT |
1228 | return; |
1229 | } | |
e71a4783 | 1230 | if (wrqu->data.length < descr->min_tokens) { |
4ec93edb | 1231 | printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, wrqu->data.length); |
1da177e4 LT |
1232 | return; |
1233 | } | |
1234 | /* Calculate extra_len - extra is NULL for restricted events */ | |
e71a4783 | 1235 | if (extra != NULL) |
1da177e4 | 1236 | extra_len = wrqu->data.length * descr->token_size; |
6582c164 JT |
1237 | /* Always at an offset in wrqu */ |
1238 | wrqu_off = IW_EV_POINT_OFF; | |
1da177e4 LT |
1239 | } |
1240 | ||
1241 | /* Total length of the event */ | |
1242 | hdr_len = event_type_size[descr->header_type]; | |
1243 | event_len = hdr_len + extra_len; | |
1244 | ||
1da177e4 LT |
1245 | /* Create temporary buffer to hold the event */ |
1246 | event = kmalloc(event_len, GFP_ATOMIC); | |
e71a4783 | 1247 | if (event == NULL) |
1da177e4 LT |
1248 | return; |
1249 | ||
1250 | /* Fill event */ | |
1251 | event->len = event_len; | |
1252 | event->cmd = cmd; | |
6582c164 | 1253 | memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN); |
4d44e0df | 1254 | if (extra) |
1da177e4 LT |
1255 | memcpy(((char *) event) + hdr_len, extra, extra_len); |
1256 | ||
711e2c33 | 1257 | /* Send via the RtNetlink event channel */ |
1da177e4 | 1258 | rtmsg_iwinfo(dev, (char *) event, event_len); |
1da177e4 LT |
1259 | |
1260 | /* Cleanup */ | |
1261 | kfree(event); | |
1262 | ||
1263 | return; /* Always success, I guess ;-) */ | |
1264 | } | |
7a9df167 | 1265 | EXPORT_SYMBOL(wireless_send_event); |
1da177e4 LT |
1266 | |
1267 | /********************** ENHANCED IWSPY SUPPORT **********************/ | |
1268 | /* | |
1269 | * In the old days, the driver was handling spy support all by itself. | |
1270 | * Now, the driver can delegate this task to Wireless Extensions. | |
1271 | * It needs to use those standard spy iw_handler in struct iw_handler_def, | |
1272 | * push data to us via wireless_spy_update() and include struct iw_spy_data | |
6582c164 | 1273 | * in its private part (and export it in net_device->wireless_data->spy_data). |
1da177e4 LT |
1274 | * One of the main advantage of centralising spy support here is that |
1275 | * it becomes much easier to improve and extend it without having to touch | |
1276 | * the drivers. One example is the addition of the Spy-Threshold events. | |
1277 | */ | |
1278 | ||
1279 | /* ---------------------------------------------------------------- */ | |
1280 | /* | |
1281 | * Return the pointer to the spy data in the driver. | |
1282 | * Because this is called on the Rx path via wireless_spy_update(), | |
1283 | * we want it to be efficient... | |
1284 | */ | |
4d44e0df | 1285 | static inline struct iw_spy_data *get_spydata(struct net_device *dev) |
1da177e4 LT |
1286 | { |
1287 | /* This is the new way */ | |
e71a4783 | 1288 | if (dev->wireless_data) |
4d44e0df | 1289 | return dev->wireless_data->spy_data; |
6582c164 | 1290 | return NULL; |
1da177e4 LT |
1291 | } |
1292 | ||
1293 | /*------------------------------------------------------------------*/ | |
1294 | /* | |
1295 | * Standard Wireless Handler : set Spy List | |
1296 | */ | |
1297 | int iw_handler_set_spy(struct net_device * dev, | |
1298 | struct iw_request_info * info, | |
1299 | union iwreq_data * wrqu, | |
1300 | char * extra) | |
1301 | { | |
1302 | struct iw_spy_data * spydata = get_spydata(dev); | |
1303 | struct sockaddr * address = (struct sockaddr *) extra; | |
1304 | ||
1da177e4 | 1305 | /* Make sure driver is not buggy or using the old API */ |
e71a4783 | 1306 | if (!spydata) |
1da177e4 LT |
1307 | return -EOPNOTSUPP; |
1308 | ||
1309 | /* Disable spy collection while we copy the addresses. | |
1310 | * While we copy addresses, any call to wireless_spy_update() | |
1311 | * will NOP. This is OK, as anyway the addresses are changing. */ | |
1312 | spydata->spy_number = 0; | |
1313 | ||
1314 | /* We want to operate without locking, because wireless_spy_update() | |
1315 | * most likely will happen in the interrupt handler, and therefore | |
1316 | * have its own locking constraints and needs performance. | |
1317 | * The rtnl_lock() make sure we don't race with the other iw_handlers. | |
1318 | * This make sure wireless_spy_update() "see" that the spy list | |
1319 | * is temporarily disabled. */ | |
e16aa207 | 1320 | smp_wmb(); |
1da177e4 LT |
1321 | |
1322 | /* Are there are addresses to copy? */ | |
e71a4783 | 1323 | if (wrqu->data.length > 0) { |
1da177e4 LT |
1324 | int i; |
1325 | ||
1326 | /* Copy addresses */ | |
e71a4783 | 1327 | for (i = 0; i < wrqu->data.length; i++) |
1da177e4 LT |
1328 | memcpy(spydata->spy_address[i], address[i].sa_data, |
1329 | ETH_ALEN); | |
1330 | /* Reset stats */ | |
1331 | memset(spydata->spy_stat, 0, | |
1332 | sizeof(struct iw_quality) * IW_MAX_SPY); | |
1da177e4 LT |
1333 | } |
1334 | ||
1335 | /* Make sure above is updated before re-enabling */ | |
e16aa207 | 1336 | smp_wmb(); |
1da177e4 LT |
1337 | |
1338 | /* Enable addresses */ | |
1339 | spydata->spy_number = wrqu->data.length; | |
1340 | ||
1341 | return 0; | |
1342 | } | |
7a9df167 | 1343 | EXPORT_SYMBOL(iw_handler_set_spy); |
1da177e4 LT |
1344 | |
1345 | /*------------------------------------------------------------------*/ | |
1346 | /* | |
1347 | * Standard Wireless Handler : get Spy List | |
1348 | */ | |
1349 | int iw_handler_get_spy(struct net_device * dev, | |
1350 | struct iw_request_info * info, | |
1351 | union iwreq_data * wrqu, | |
1352 | char * extra) | |
1353 | { | |
1354 | struct iw_spy_data * spydata = get_spydata(dev); | |
1355 | struct sockaddr * address = (struct sockaddr *) extra; | |
1356 | int i; | |
1357 | ||
1358 | /* Make sure driver is not buggy or using the old API */ | |
e71a4783 | 1359 | if (!spydata) |
1da177e4 LT |
1360 | return -EOPNOTSUPP; |
1361 | ||
1362 | wrqu->data.length = spydata->spy_number; | |
1363 | ||
1364 | /* Copy addresses. */ | |
e71a4783 | 1365 | for (i = 0; i < spydata->spy_number; i++) { |
1da177e4 LT |
1366 | memcpy(address[i].sa_data, spydata->spy_address[i], ETH_ALEN); |
1367 | address[i].sa_family = AF_UNIX; | |
1368 | } | |
1369 | /* Copy stats to the user buffer (just after). */ | |
e71a4783 | 1370 | if (spydata->spy_number > 0) |
1da177e4 LT |
1371 | memcpy(extra + (sizeof(struct sockaddr) *spydata->spy_number), |
1372 | spydata->spy_stat, | |
1373 | sizeof(struct iw_quality) * spydata->spy_number); | |
1374 | /* Reset updated flags. */ | |
e71a4783 | 1375 | for (i = 0; i < spydata->spy_number; i++) |
6582c164 | 1376 | spydata->spy_stat[i].updated &= ~IW_QUAL_ALL_UPDATED; |
1da177e4 LT |
1377 | return 0; |
1378 | } | |
7a9df167 | 1379 | EXPORT_SYMBOL(iw_handler_get_spy); |
1da177e4 LT |
1380 | |
1381 | /*------------------------------------------------------------------*/ | |
1382 | /* | |
1383 | * Standard Wireless Handler : set spy threshold | |
1384 | */ | |
1385 | int iw_handler_set_thrspy(struct net_device * dev, | |
1386 | struct iw_request_info *info, | |
1387 | union iwreq_data * wrqu, | |
1388 | char * extra) | |
1389 | { | |
1390 | struct iw_spy_data * spydata = get_spydata(dev); | |
1391 | struct iw_thrspy * threshold = (struct iw_thrspy *) extra; | |
1392 | ||
1393 | /* Make sure driver is not buggy or using the old API */ | |
e71a4783 | 1394 | if (!spydata) |
1da177e4 LT |
1395 | return -EOPNOTSUPP; |
1396 | ||
1397 | /* Just do it */ | |
1398 | memcpy(&(spydata->spy_thr_low), &(threshold->low), | |
1399 | 2 * sizeof(struct iw_quality)); | |
1400 | ||
1401 | /* Clear flag */ | |
1402 | memset(spydata->spy_thr_under, '\0', sizeof(spydata->spy_thr_under)); | |
1403 | ||
1da177e4 LT |
1404 | return 0; |
1405 | } | |
7a9df167 | 1406 | EXPORT_SYMBOL(iw_handler_set_thrspy); |
1da177e4 LT |
1407 | |
1408 | /*------------------------------------------------------------------*/ | |
1409 | /* | |
1410 | * Standard Wireless Handler : get spy threshold | |
1411 | */ | |
1412 | int iw_handler_get_thrspy(struct net_device * dev, | |
1413 | struct iw_request_info *info, | |
1414 | union iwreq_data * wrqu, | |
1415 | char * extra) | |
1416 | { | |
1417 | struct iw_spy_data * spydata = get_spydata(dev); | |
1418 | struct iw_thrspy * threshold = (struct iw_thrspy *) extra; | |
1419 | ||
1420 | /* Make sure driver is not buggy or using the old API */ | |
e71a4783 | 1421 | if (!spydata) |
1da177e4 LT |
1422 | return -EOPNOTSUPP; |
1423 | ||
1424 | /* Just do it */ | |
1425 | memcpy(&(threshold->low), &(spydata->spy_thr_low), | |
1426 | 2 * sizeof(struct iw_quality)); | |
1427 | ||
1428 | return 0; | |
1429 | } | |
7a9df167 | 1430 | EXPORT_SYMBOL(iw_handler_get_thrspy); |
1da177e4 LT |
1431 | |
1432 | /*------------------------------------------------------------------*/ | |
1433 | /* | |
1434 | * Prepare and send a Spy Threshold event | |
1435 | */ | |
1436 | static void iw_send_thrspy_event(struct net_device * dev, | |
1437 | struct iw_spy_data * spydata, | |
1438 | unsigned char * address, | |
1439 | struct iw_quality * wstats) | |
1440 | { | |
1441 | union iwreq_data wrqu; | |
1442 | struct iw_thrspy threshold; | |
1443 | ||
1444 | /* Init */ | |
1445 | wrqu.data.length = 1; | |
1446 | wrqu.data.flags = 0; | |
1447 | /* Copy address */ | |
1448 | memcpy(threshold.addr.sa_data, address, ETH_ALEN); | |
1449 | threshold.addr.sa_family = ARPHRD_ETHER; | |
1450 | /* Copy stats */ | |
1451 | memcpy(&(threshold.qual), wstats, sizeof(struct iw_quality)); | |
1452 | /* Copy also thresholds */ | |
1453 | memcpy(&(threshold.low), &(spydata->spy_thr_low), | |
1454 | 2 * sizeof(struct iw_quality)); | |
1455 | ||
1da177e4 LT |
1456 | /* Send event to user space */ |
1457 | wireless_send_event(dev, SIOCGIWTHRSPY, &wrqu, (char *) &threshold); | |
1458 | } | |
1459 | ||
1460 | /* ---------------------------------------------------------------- */ | |
1461 | /* | |
1462 | * Call for the driver to update the spy data. | |
1463 | * For now, the spy data is a simple array. As the size of the array is | |
1464 | * small, this is good enough. If we wanted to support larger number of | |
1465 | * spy addresses, we should use something more efficient... | |
1466 | */ | |
1467 | void wireless_spy_update(struct net_device * dev, | |
1468 | unsigned char * address, | |
1469 | struct iw_quality * wstats) | |
1470 | { | |
1471 | struct iw_spy_data * spydata = get_spydata(dev); | |
1472 | int i; | |
1473 | int match = -1; | |
1474 | ||
1475 | /* Make sure driver is not buggy or using the old API */ | |
e71a4783 | 1476 | if (!spydata) |
1da177e4 LT |
1477 | return; |
1478 | ||
1da177e4 | 1479 | /* Update all records that match */ |
e71a4783 SH |
1480 | for (i = 0; i < spydata->spy_number; i++) |
1481 | if (!compare_ether_addr(address, spydata->spy_address[i])) { | |
1da177e4 LT |
1482 | memcpy(&(spydata->spy_stat[i]), wstats, |
1483 | sizeof(struct iw_quality)); | |
1484 | match = i; | |
1485 | } | |
1486 | ||
1487 | /* Generate an event if we cross the spy threshold. | |
1488 | * To avoid event storms, we have a simple hysteresis : we generate | |
1489 | * event only when we go under the low threshold or above the | |
1490 | * high threshold. */ | |
e71a4783 SH |
1491 | if (match >= 0) { |
1492 | if (spydata->spy_thr_under[match]) { | |
1493 | if (wstats->level > spydata->spy_thr_high.level) { | |
1da177e4 LT |
1494 | spydata->spy_thr_under[match] = 0; |
1495 | iw_send_thrspy_event(dev, spydata, | |
1496 | address, wstats); | |
1497 | } | |
1498 | } else { | |
e71a4783 | 1499 | if (wstats->level < spydata->spy_thr_low.level) { |
1da177e4 LT |
1500 | spydata->spy_thr_under[match] = 1; |
1501 | iw_send_thrspy_event(dev, spydata, | |
1502 | address, wstats); | |
1503 | } | |
1504 | } | |
1505 | } | |
1506 | } | |
1da177e4 | 1507 | EXPORT_SYMBOL(wireless_spy_update); |