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> |
1da177e4 LT |
96 | |
97 | #include <linux/wireless.h> /* Pretty obvious */ | |
98 | #include <net/iw_handler.h> /* New driver API */ | |
bd5785ba | 99 | #include <net/netlink.h> |
295f4a1f | 100 | #include <net/wext.h> |
1da177e4 LT |
101 | |
102 | #include <asm/uaccess.h> /* copy_to_user() */ | |
103 | ||
1da177e4 LT |
104 | /************************* GLOBAL VARIABLES *************************/ |
105 | /* | |
106 | * You should not use global variables, because of re-entrancy. | |
107 | * On our case, it's only const, so it's OK... | |
108 | */ | |
109 | /* | |
110 | * Meta-data about all the standard Wireless Extension request we | |
111 | * know about. | |
112 | */ | |
113 | static const struct iw_ioctl_description standard_ioctl[] = { | |
114 | [SIOCSIWCOMMIT - SIOCIWFIRST] = { | |
115 | .header_type = IW_HEADER_TYPE_NULL, | |
116 | }, | |
117 | [SIOCGIWNAME - SIOCIWFIRST] = { | |
118 | .header_type = IW_HEADER_TYPE_CHAR, | |
119 | .flags = IW_DESCR_FLAG_DUMP, | |
120 | }, | |
121 | [SIOCSIWNWID - SIOCIWFIRST] = { | |
122 | .header_type = IW_HEADER_TYPE_PARAM, | |
123 | .flags = IW_DESCR_FLAG_EVENT, | |
124 | }, | |
125 | [SIOCGIWNWID - SIOCIWFIRST] = { | |
126 | .header_type = IW_HEADER_TYPE_PARAM, | |
127 | .flags = IW_DESCR_FLAG_DUMP, | |
128 | }, | |
129 | [SIOCSIWFREQ - SIOCIWFIRST] = { | |
130 | .header_type = IW_HEADER_TYPE_FREQ, | |
131 | .flags = IW_DESCR_FLAG_EVENT, | |
132 | }, | |
133 | [SIOCGIWFREQ - SIOCIWFIRST] = { | |
134 | .header_type = IW_HEADER_TYPE_FREQ, | |
135 | .flags = IW_DESCR_FLAG_DUMP, | |
136 | }, | |
137 | [SIOCSIWMODE - SIOCIWFIRST] = { | |
138 | .header_type = IW_HEADER_TYPE_UINT, | |
139 | .flags = IW_DESCR_FLAG_EVENT, | |
140 | }, | |
141 | [SIOCGIWMODE - SIOCIWFIRST] = { | |
142 | .header_type = IW_HEADER_TYPE_UINT, | |
143 | .flags = IW_DESCR_FLAG_DUMP, | |
144 | }, | |
145 | [SIOCSIWSENS - SIOCIWFIRST] = { | |
146 | .header_type = IW_HEADER_TYPE_PARAM, | |
147 | }, | |
148 | [SIOCGIWSENS - SIOCIWFIRST] = { | |
149 | .header_type = IW_HEADER_TYPE_PARAM, | |
150 | }, | |
151 | [SIOCSIWRANGE - SIOCIWFIRST] = { | |
152 | .header_type = IW_HEADER_TYPE_NULL, | |
153 | }, | |
154 | [SIOCGIWRANGE - SIOCIWFIRST] = { | |
155 | .header_type = IW_HEADER_TYPE_POINT, | |
156 | .token_size = 1, | |
157 | .max_tokens = sizeof(struct iw_range), | |
158 | .flags = IW_DESCR_FLAG_DUMP, | |
159 | }, | |
160 | [SIOCSIWPRIV - SIOCIWFIRST] = { | |
161 | .header_type = IW_HEADER_TYPE_NULL, | |
162 | }, | |
163 | [SIOCGIWPRIV - SIOCIWFIRST] = { /* (handled directly by us) */ | |
711e2c33 JT |
164 | .header_type = IW_HEADER_TYPE_POINT, |
165 | .token_size = sizeof(struct iw_priv_args), | |
166 | .max_tokens = 16, | |
167 | .flags = IW_DESCR_FLAG_NOMAX, | |
1da177e4 LT |
168 | }, |
169 | [SIOCSIWSTATS - SIOCIWFIRST] = { | |
170 | .header_type = IW_HEADER_TYPE_NULL, | |
171 | }, | |
172 | [SIOCGIWSTATS - SIOCIWFIRST] = { /* (handled directly by us) */ | |
711e2c33 JT |
173 | .header_type = IW_HEADER_TYPE_POINT, |
174 | .token_size = 1, | |
175 | .max_tokens = sizeof(struct iw_statistics), | |
1da177e4 LT |
176 | .flags = IW_DESCR_FLAG_DUMP, |
177 | }, | |
178 | [SIOCSIWSPY - SIOCIWFIRST] = { | |
179 | .header_type = IW_HEADER_TYPE_POINT, | |
180 | .token_size = sizeof(struct sockaddr), | |
181 | .max_tokens = IW_MAX_SPY, | |
182 | }, | |
183 | [SIOCGIWSPY - SIOCIWFIRST] = { | |
184 | .header_type = IW_HEADER_TYPE_POINT, | |
185 | .token_size = sizeof(struct sockaddr) + | |
186 | sizeof(struct iw_quality), | |
187 | .max_tokens = IW_MAX_SPY, | |
188 | }, | |
189 | [SIOCSIWTHRSPY - SIOCIWFIRST] = { | |
190 | .header_type = IW_HEADER_TYPE_POINT, | |
191 | .token_size = sizeof(struct iw_thrspy), | |
192 | .min_tokens = 1, | |
193 | .max_tokens = 1, | |
194 | }, | |
195 | [SIOCGIWTHRSPY - SIOCIWFIRST] = { | |
196 | .header_type = IW_HEADER_TYPE_POINT, | |
197 | .token_size = sizeof(struct iw_thrspy), | |
198 | .min_tokens = 1, | |
199 | .max_tokens = 1, | |
200 | }, | |
201 | [SIOCSIWAP - SIOCIWFIRST] = { | |
202 | .header_type = IW_HEADER_TYPE_ADDR, | |
203 | }, | |
204 | [SIOCGIWAP - SIOCIWFIRST] = { | |
205 | .header_type = IW_HEADER_TYPE_ADDR, | |
206 | .flags = IW_DESCR_FLAG_DUMP, | |
207 | }, | |
fff9cfd9 | 208 | [SIOCSIWMLME - SIOCIWFIRST] = { |
209 | .header_type = IW_HEADER_TYPE_POINT, | |
210 | .token_size = 1, | |
211 | .min_tokens = sizeof(struct iw_mlme), | |
212 | .max_tokens = sizeof(struct iw_mlme), | |
213 | }, | |
1da177e4 LT |
214 | [SIOCGIWAPLIST - SIOCIWFIRST] = { |
215 | .header_type = IW_HEADER_TYPE_POINT, | |
216 | .token_size = sizeof(struct sockaddr) + | |
217 | sizeof(struct iw_quality), | |
218 | .max_tokens = IW_MAX_AP, | |
219 | .flags = IW_DESCR_FLAG_NOMAX, | |
220 | }, | |
221 | [SIOCSIWSCAN - SIOCIWFIRST] = { | |
fff9cfd9 | 222 | .header_type = IW_HEADER_TYPE_POINT, |
223 | .token_size = 1, | |
224 | .min_tokens = 0, | |
225 | .max_tokens = sizeof(struct iw_scan_req), | |
1da177e4 LT |
226 | }, |
227 | [SIOCGIWSCAN - SIOCIWFIRST] = { | |
228 | .header_type = IW_HEADER_TYPE_POINT, | |
229 | .token_size = 1, | |
230 | .max_tokens = IW_SCAN_MAX_DATA, | |
231 | .flags = IW_DESCR_FLAG_NOMAX, | |
232 | }, | |
233 | [SIOCSIWESSID - SIOCIWFIRST] = { | |
234 | .header_type = IW_HEADER_TYPE_POINT, | |
235 | .token_size = 1, | |
baef1865 | 236 | .max_tokens = IW_ESSID_MAX_SIZE, |
1da177e4 LT |
237 | .flags = IW_DESCR_FLAG_EVENT, |
238 | }, | |
239 | [SIOCGIWESSID - SIOCIWFIRST] = { | |
240 | .header_type = IW_HEADER_TYPE_POINT, | |
241 | .token_size = 1, | |
baef1865 | 242 | .max_tokens = IW_ESSID_MAX_SIZE, |
1da177e4 LT |
243 | .flags = IW_DESCR_FLAG_DUMP, |
244 | }, | |
245 | [SIOCSIWNICKN - SIOCIWFIRST] = { | |
246 | .header_type = IW_HEADER_TYPE_POINT, | |
247 | .token_size = 1, | |
baef1865 | 248 | .max_tokens = IW_ESSID_MAX_SIZE, |
1da177e4 LT |
249 | }, |
250 | [SIOCGIWNICKN - SIOCIWFIRST] = { | |
251 | .header_type = IW_HEADER_TYPE_POINT, | |
252 | .token_size = 1, | |
baef1865 | 253 | .max_tokens = IW_ESSID_MAX_SIZE, |
1da177e4 LT |
254 | }, |
255 | [SIOCSIWRATE - SIOCIWFIRST] = { | |
256 | .header_type = IW_HEADER_TYPE_PARAM, | |
257 | }, | |
258 | [SIOCGIWRATE - SIOCIWFIRST] = { | |
259 | .header_type = IW_HEADER_TYPE_PARAM, | |
260 | }, | |
261 | [SIOCSIWRTS - SIOCIWFIRST] = { | |
262 | .header_type = IW_HEADER_TYPE_PARAM, | |
263 | }, | |
264 | [SIOCGIWRTS - SIOCIWFIRST] = { | |
265 | .header_type = IW_HEADER_TYPE_PARAM, | |
266 | }, | |
267 | [SIOCSIWFRAG - SIOCIWFIRST] = { | |
268 | .header_type = IW_HEADER_TYPE_PARAM, | |
269 | }, | |
270 | [SIOCGIWFRAG - SIOCIWFIRST] = { | |
271 | .header_type = IW_HEADER_TYPE_PARAM, | |
272 | }, | |
273 | [SIOCSIWTXPOW - SIOCIWFIRST] = { | |
274 | .header_type = IW_HEADER_TYPE_PARAM, | |
275 | }, | |
276 | [SIOCGIWTXPOW - SIOCIWFIRST] = { | |
277 | .header_type = IW_HEADER_TYPE_PARAM, | |
278 | }, | |
279 | [SIOCSIWRETRY - SIOCIWFIRST] = { | |
280 | .header_type = IW_HEADER_TYPE_PARAM, | |
281 | }, | |
282 | [SIOCGIWRETRY - SIOCIWFIRST] = { | |
283 | .header_type = IW_HEADER_TYPE_PARAM, | |
284 | }, | |
285 | [SIOCSIWENCODE - SIOCIWFIRST] = { | |
286 | .header_type = IW_HEADER_TYPE_POINT, | |
287 | .token_size = 1, | |
288 | .max_tokens = IW_ENCODING_TOKEN_MAX, | |
289 | .flags = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT, | |
290 | }, | |
291 | [SIOCGIWENCODE - SIOCIWFIRST] = { | |
292 | .header_type = IW_HEADER_TYPE_POINT, | |
293 | .token_size = 1, | |
294 | .max_tokens = IW_ENCODING_TOKEN_MAX, | |
295 | .flags = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT, | |
296 | }, | |
297 | [SIOCSIWPOWER - SIOCIWFIRST] = { | |
298 | .header_type = IW_HEADER_TYPE_PARAM, | |
299 | }, | |
300 | [SIOCGIWPOWER - SIOCIWFIRST] = { | |
301 | .header_type = IW_HEADER_TYPE_PARAM, | |
302 | }, | |
fff9cfd9 | 303 | [SIOCSIWGENIE - SIOCIWFIRST] = { |
304 | .header_type = IW_HEADER_TYPE_POINT, | |
305 | .token_size = 1, | |
306 | .max_tokens = IW_GENERIC_IE_MAX, | |
307 | }, | |
308 | [SIOCGIWGENIE - SIOCIWFIRST] = { | |
309 | .header_type = IW_HEADER_TYPE_POINT, | |
310 | .token_size = 1, | |
311 | .max_tokens = IW_GENERIC_IE_MAX, | |
312 | }, | |
313 | [SIOCSIWAUTH - SIOCIWFIRST] = { | |
314 | .header_type = IW_HEADER_TYPE_PARAM, | |
315 | }, | |
316 | [SIOCGIWAUTH - SIOCIWFIRST] = { | |
317 | .header_type = IW_HEADER_TYPE_PARAM, | |
318 | }, | |
319 | [SIOCSIWENCODEEXT - SIOCIWFIRST] = { | |
320 | .header_type = IW_HEADER_TYPE_POINT, | |
321 | .token_size = 1, | |
322 | .min_tokens = sizeof(struct iw_encode_ext), | |
323 | .max_tokens = sizeof(struct iw_encode_ext) + | |
324 | IW_ENCODING_TOKEN_MAX, | |
325 | }, | |
326 | [SIOCGIWENCODEEXT - SIOCIWFIRST] = { | |
327 | .header_type = IW_HEADER_TYPE_POINT, | |
328 | .token_size = 1, | |
329 | .min_tokens = sizeof(struct iw_encode_ext), | |
330 | .max_tokens = sizeof(struct iw_encode_ext) + | |
331 | IW_ENCODING_TOKEN_MAX, | |
332 | }, | |
333 | [SIOCSIWPMKSA - SIOCIWFIRST] = { | |
334 | .header_type = IW_HEADER_TYPE_POINT, | |
335 | .token_size = 1, | |
336 | .min_tokens = sizeof(struct iw_pmksa), | |
337 | .max_tokens = sizeof(struct iw_pmksa), | |
338 | }, | |
1da177e4 | 339 | }; |
1ac58ee3 | 340 | static const unsigned standard_ioctl_num = ARRAY_SIZE(standard_ioctl); |
1da177e4 LT |
341 | |
342 | /* | |
343 | * Meta-data about all the additional standard Wireless Extension events | |
344 | * we know about. | |
345 | */ | |
346 | static const struct iw_ioctl_description standard_event[] = { | |
347 | [IWEVTXDROP - IWEVFIRST] = { | |
348 | .header_type = IW_HEADER_TYPE_ADDR, | |
349 | }, | |
350 | [IWEVQUAL - IWEVFIRST] = { | |
351 | .header_type = IW_HEADER_TYPE_QUAL, | |
352 | }, | |
353 | [IWEVCUSTOM - IWEVFIRST] = { | |
354 | .header_type = IW_HEADER_TYPE_POINT, | |
355 | .token_size = 1, | |
356 | .max_tokens = IW_CUSTOM_MAX, | |
357 | }, | |
358 | [IWEVREGISTERED - IWEVFIRST] = { | |
359 | .header_type = IW_HEADER_TYPE_ADDR, | |
360 | }, | |
361 | [IWEVEXPIRED - IWEVFIRST] = { | |
4ec93edb | 362 | .header_type = IW_HEADER_TYPE_ADDR, |
1da177e4 | 363 | }, |
fff9cfd9 | 364 | [IWEVGENIE - IWEVFIRST] = { |
365 | .header_type = IW_HEADER_TYPE_POINT, | |
366 | .token_size = 1, | |
367 | .max_tokens = IW_GENERIC_IE_MAX, | |
368 | }, | |
369 | [IWEVMICHAELMICFAILURE - IWEVFIRST] = { | |
4ec93edb | 370 | .header_type = IW_HEADER_TYPE_POINT, |
fff9cfd9 | 371 | .token_size = 1, |
372 | .max_tokens = sizeof(struct iw_michaelmicfailure), | |
373 | }, | |
374 | [IWEVASSOCREQIE - IWEVFIRST] = { | |
375 | .header_type = IW_HEADER_TYPE_POINT, | |
376 | .token_size = 1, | |
377 | .max_tokens = IW_GENERIC_IE_MAX, | |
378 | }, | |
379 | [IWEVASSOCRESPIE - IWEVFIRST] = { | |
380 | .header_type = IW_HEADER_TYPE_POINT, | |
381 | .token_size = 1, | |
382 | .max_tokens = IW_GENERIC_IE_MAX, | |
383 | }, | |
384 | [IWEVPMKIDCAND - IWEVFIRST] = { | |
385 | .header_type = IW_HEADER_TYPE_POINT, | |
386 | .token_size = 1, | |
387 | .max_tokens = sizeof(struct iw_pmkid_cand), | |
388 | }, | |
1da177e4 | 389 | }; |
1ac58ee3 | 390 | static const unsigned standard_event_num = ARRAY_SIZE(standard_event); |
1da177e4 LT |
391 | |
392 | /* Size (in bytes) of the various private data types */ | |
393 | static const char iw_priv_type_size[] = { | |
394 | 0, /* IW_PRIV_TYPE_NONE */ | |
395 | 1, /* IW_PRIV_TYPE_BYTE */ | |
396 | 1, /* IW_PRIV_TYPE_CHAR */ | |
397 | 0, /* Not defined */ | |
398 | sizeof(__u32), /* IW_PRIV_TYPE_INT */ | |
399 | sizeof(struct iw_freq), /* IW_PRIV_TYPE_FLOAT */ | |
400 | sizeof(struct sockaddr), /* IW_PRIV_TYPE_ADDR */ | |
401 | 0, /* Not defined */ | |
402 | }; | |
403 | ||
404 | /* Size (in bytes) of various events */ | |
405 | static const int event_type_size[] = { | |
406 | IW_EV_LCP_LEN, /* IW_HEADER_TYPE_NULL */ | |
407 | 0, | |
408 | IW_EV_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */ | |
409 | 0, | |
410 | IW_EV_UINT_LEN, /* IW_HEADER_TYPE_UINT */ | |
411 | IW_EV_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */ | |
412 | IW_EV_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */ | |
413 | 0, | |
414 | IW_EV_POINT_LEN, /* Without variable payload */ | |
415 | IW_EV_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */ | |
416 | IW_EV_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */ | |
417 | }; | |
418 | ||
c2805fbb JT |
419 | /* Size (in bytes) of various events, as packed */ |
420 | static const int event_type_pk_size[] = { | |
421 | IW_EV_LCP_PK_LEN, /* IW_HEADER_TYPE_NULL */ | |
422 | 0, | |
423 | IW_EV_CHAR_PK_LEN, /* IW_HEADER_TYPE_CHAR */ | |
424 | 0, | |
425 | IW_EV_UINT_PK_LEN, /* IW_HEADER_TYPE_UINT */ | |
426 | IW_EV_FREQ_PK_LEN, /* IW_HEADER_TYPE_FREQ */ | |
427 | IW_EV_ADDR_PK_LEN, /* IW_HEADER_TYPE_ADDR */ | |
428 | 0, | |
429 | IW_EV_POINT_PK_LEN, /* Without variable payload */ | |
430 | IW_EV_PARAM_PK_LEN, /* IW_HEADER_TYPE_PARAM */ | |
431 | IW_EV_QUAL_PK_LEN, /* IW_HEADER_TYPE_QUAL */ | |
432 | }; | |
433 | ||
1da177e4 LT |
434 | /************************ COMMON SUBROUTINES ************************/ |
435 | /* | |
436 | * Stuff that may be used in various place or doesn't fit in one | |
437 | * of the section below. | |
438 | */ | |
439 | ||
440 | /* ---------------------------------------------------------------- */ | |
441 | /* | |
442 | * Return the driver handler associated with a specific Wireless Extension. | |
1da177e4 | 443 | */ |
bdf51894 | 444 | static iw_handler get_handler(struct net_device *dev, unsigned int cmd) |
1da177e4 LT |
445 | { |
446 | /* Don't "optimise" the following variable, it will crash */ | |
447 | unsigned int index; /* *MUST* be unsigned */ | |
448 | ||
449 | /* Check if we have some wireless handlers defined */ | |
e71a4783 | 450 | if (dev->wireless_handlers == NULL) |
1da177e4 LT |
451 | return NULL; |
452 | ||
453 | /* Try as a standard command */ | |
454 | index = cmd - SIOCIWFIRST; | |
e71a4783 | 455 | if (index < dev->wireless_handlers->num_standard) |
1da177e4 LT |
456 | return dev->wireless_handlers->standard[index]; |
457 | ||
458 | /* Try as a private command */ | |
459 | index = cmd - SIOCIWFIRSTPRIV; | |
e71a4783 | 460 | if (index < dev->wireless_handlers->num_private) |
1da177e4 LT |
461 | return dev->wireless_handlers->private[index]; |
462 | ||
463 | /* Not found */ | |
464 | return NULL; | |
465 | } | |
466 | ||
467 | /* ---------------------------------------------------------------- */ | |
468 | /* | |
469 | * Get statistics out of the driver | |
470 | */ | |
bdf51894 | 471 | static struct iw_statistics *get_wireless_stats(struct net_device *dev) |
1da177e4 LT |
472 | { |
473 | /* New location */ | |
e71a4783 | 474 | if ((dev->wireless_handlers != NULL) && |
1da177e4 LT |
475 | (dev->wireless_handlers->get_wireless_stats != NULL)) |
476 | return dev->wireless_handlers->get_wireless_stats(dev); | |
477 | ||
6582c164 | 478 | /* Not found */ |
4d44e0df | 479 | return NULL; |
1da177e4 LT |
480 | } |
481 | ||
482 | /* ---------------------------------------------------------------- */ | |
483 | /* | |
484 | * Call the commit handler in the driver | |
485 | * (if exist and if conditions are right) | |
486 | * | |
487 | * Note : our current commit strategy is currently pretty dumb, | |
488 | * but we will be able to improve on that... | |
489 | * The goal is to try to agreagate as many changes as possible | |
490 | * before doing the commit. Drivers that will define a commit handler | |
491 | * are usually those that need a reset after changing parameters, so | |
492 | * we want to minimise the number of reset. | |
493 | * A cool idea is to use a timer : at each "set" command, we re-set the | |
494 | * timer, when the timer eventually fires, we call the driver. | |
495 | * Hopefully, more on that later. | |
496 | * | |
497 | * Also, I'm waiting to see how many people will complain about the | |
498 | * netif_running(dev) test. I'm open on that one... | |
499 | * Hopefully, the driver will remember to do a commit in "open()" ;-) | |
500 | */ | |
bdf51894 | 501 | static int call_commit_handler(struct net_device *dev) |
1da177e4 | 502 | { |
e71a4783 | 503 | if ((netif_running(dev)) && |
4d44e0df | 504 | (dev->wireless_handlers->standard[0] != NULL)) |
1da177e4 LT |
505 | /* Call the commit handler on the driver */ |
506 | return dev->wireless_handlers->standard[0](dev, NULL, | |
507 | NULL, NULL); | |
4d44e0df | 508 | else |
1da177e4 LT |
509 | return 0; /* Command completed successfully */ |
510 | } | |
511 | ||
512 | /* ---------------------------------------------------------------- */ | |
513 | /* | |
514 | * Calculate size of private arguments | |
515 | */ | |
516 | static inline int get_priv_size(__u16 args) | |
517 | { | |
518 | int num = args & IW_PRIV_SIZE_MASK; | |
519 | int type = (args & IW_PRIV_TYPE_MASK) >> 12; | |
520 | ||
521 | return num * iw_priv_type_size[type]; | |
522 | } | |
523 | ||
524 | /* ---------------------------------------------------------------- */ | |
525 | /* | |
526 | * Re-calculate the size of private arguments | |
527 | */ | |
528 | static inline int adjust_priv_size(__u16 args, | |
529 | union iwreq_data * wrqu) | |
530 | { | |
531 | int num = wrqu->data.length; | |
532 | int max = args & IW_PRIV_SIZE_MASK; | |
533 | int type = (args & IW_PRIV_TYPE_MASK) >> 12; | |
534 | ||
535 | /* Make sure the driver doesn't goof up */ | |
536 | if (max < num) | |
537 | num = max; | |
538 | ||
539 | return num * iw_priv_type_size[type]; | |
540 | } | |
541 | ||
711e2c33 JT |
542 | /* ---------------------------------------------------------------- */ |
543 | /* | |
544 | * Standard Wireless Handler : get wireless stats | |
545 | * Allow programatic access to /proc/net/wireless even if /proc | |
546 | * doesn't exist... Also more efficient... | |
547 | */ | |
548 | static int iw_handler_get_iwstats(struct net_device * dev, | |
549 | struct iw_request_info * info, | |
550 | union iwreq_data * wrqu, | |
551 | char * extra) | |
552 | { | |
553 | /* Get stats from the driver */ | |
554 | struct iw_statistics *stats; | |
555 | ||
556 | stats = get_wireless_stats(dev); | |
4d44e0df | 557 | if (stats) { |
711e2c33 JT |
558 | /* Copy statistics to extra */ |
559 | memcpy(extra, stats, sizeof(struct iw_statistics)); | |
560 | wrqu->data.length = sizeof(struct iw_statistics); | |
561 | ||
562 | /* Check if we need to clear the updated flag */ | |
e71a4783 | 563 | if (wrqu->data.flags != 0) |
711e2c33 JT |
564 | stats->qual.updated &= ~IW_QUAL_ALL_UPDATED; |
565 | return 0; | |
566 | } else | |
567 | return -EOPNOTSUPP; | |
568 | } | |
569 | ||
570 | /* ---------------------------------------------------------------- */ | |
571 | /* | |
572 | * Standard Wireless Handler : get iwpriv definitions | |
573 | * Export the driver private handler definition | |
574 | * They will be picked up by tools like iwpriv... | |
575 | */ | |
576 | static int iw_handler_get_private(struct net_device * dev, | |
577 | struct iw_request_info * info, | |
578 | union iwreq_data * wrqu, | |
579 | char * extra) | |
580 | { | |
581 | /* Check if the driver has something to export */ | |
e71a4783 | 582 | if ((dev->wireless_handlers->num_private_args == 0) || |
711e2c33 JT |
583 | (dev->wireless_handlers->private_args == NULL)) |
584 | return -EOPNOTSUPP; | |
585 | ||
586 | /* Check if there is enough buffer up there */ | |
e71a4783 | 587 | if (wrqu->data.length < dev->wireless_handlers->num_private_args) { |
711e2c33 JT |
588 | /* User space can't know in advance how large the buffer |
589 | * needs to be. Give it a hint, so that we can support | |
590 | * any size buffer we want somewhat efficiently... */ | |
591 | wrqu->data.length = dev->wireless_handlers->num_private_args; | |
592 | return -E2BIG; | |
593 | } | |
594 | ||
595 | /* Set the number of available ioctls. */ | |
596 | wrqu->data.length = dev->wireless_handlers->num_private_args; | |
597 | ||
598 | /* Copy structure to the user buffer. */ | |
599 | memcpy(extra, dev->wireless_handlers->private_args, | |
600 | sizeof(struct iw_priv_args) * wrqu->data.length); | |
601 | ||
602 | return 0; | |
603 | } | |
604 | ||
1da177e4 LT |
605 | |
606 | /******************** /proc/net/wireless SUPPORT ********************/ | |
607 | /* | |
608 | * The /proc/net/wireless file is a human readable user-space interface | |
609 | * exporting various wireless specific statistics from the wireless devices. | |
610 | * This is the most popular part of the Wireless Extensions ;-) | |
611 | * | |
612 | * This interface is a pure clone of /proc/net/dev (in net/core/dev.c). | |
613 | * The content of the file is basically the content of "struct iw_statistics". | |
614 | */ | |
615 | ||
616 | #ifdef CONFIG_PROC_FS | |
617 | ||
618 | /* ---------------------------------------------------------------- */ | |
619 | /* | |
620 | * Print one entry (line) of /proc/net/wireless | |
621 | */ | |
bdf51894 JB |
622 | static void wireless_seq_printf_stats(struct seq_file *seq, |
623 | struct net_device *dev) | |
1da177e4 LT |
624 | { |
625 | /* Get stats from the driver */ | |
626 | struct iw_statistics *stats = get_wireless_stats(dev); | |
627 | ||
628 | if (stats) { | |
629 | seq_printf(seq, "%6s: %04x %3d%c %3d%c %3d%c %6d %6d %6d " | |
630 | "%6d %6d %6d\n", | |
631 | dev->name, stats->status, stats->qual.qual, | |
632 | stats->qual.updated & IW_QUAL_QUAL_UPDATED | |
633 | ? '.' : ' ', | |
4ec93edb | 634 | ((__s32) stats->qual.level) - |
6582c164 | 635 | ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0), |
1da177e4 LT |
636 | stats->qual.updated & IW_QUAL_LEVEL_UPDATED |
637 | ? '.' : ' ', | |
4ec93edb | 638 | ((__s32) stats->qual.noise) - |
6582c164 | 639 | ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0), |
1da177e4 LT |
640 | stats->qual.updated & IW_QUAL_NOISE_UPDATED |
641 | ? '.' : ' ', | |
642 | stats->discard.nwid, stats->discard.code, | |
643 | stats->discard.fragment, stats->discard.retries, | |
644 | stats->discard.misc, stats->miss.beacon); | |
6582c164 | 645 | stats->qual.updated &= ~IW_QUAL_ALL_UPDATED; |
1da177e4 LT |
646 | } |
647 | } | |
648 | ||
649 | /* ---------------------------------------------------------------- */ | |
650 | /* | |
651 | * Print info for /proc/net/wireless (print all entries) | |
652 | */ | |
653 | static int wireless_seq_show(struct seq_file *seq, void *v) | |
654 | { | |
655 | if (v == SEQ_START_TOKEN) | |
656 | seq_printf(seq, "Inter-| sta-| Quality | Discarded " | |
657 | "packets | Missed | WE\n" | |
658 | " face | tus | link level noise | nwid " | |
659 | "crypt frag retry misc | beacon | %d\n", | |
660 | WIRELESS_EXT); | |
661 | else | |
662 | wireless_seq_printf_stats(seq, v); | |
663 | return 0; | |
664 | } | |
665 | ||
f690808e | 666 | static const struct seq_operations wireless_seq_ops = { |
1da177e4 LT |
667 | .start = dev_seq_start, |
668 | .next = dev_seq_next, | |
669 | .stop = dev_seq_stop, | |
670 | .show = wireless_seq_show, | |
671 | }; | |
672 | ||
673 | static int wireless_seq_open(struct inode *inode, struct file *file) | |
674 | { | |
675 | return seq_open(file, &wireless_seq_ops); | |
676 | } | |
677 | ||
9a32144e | 678 | static const struct file_operations wireless_seq_fops = { |
1da177e4 LT |
679 | .owner = THIS_MODULE, |
680 | .open = wireless_seq_open, | |
681 | .read = seq_read, | |
682 | .llseek = seq_lseek, | |
683 | .release = seq_release, | |
684 | }; | |
685 | ||
295f4a1f | 686 | int __init wext_proc_init(void) |
1da177e4 | 687 | { |
6582c164 | 688 | /* Create /proc/net/wireless entry */ |
1da177e4 LT |
689 | if (!proc_net_fops_create("wireless", S_IRUGO, &wireless_seq_fops)) |
690 | return -ENOMEM; | |
691 | ||
692 | return 0; | |
693 | } | |
694 | #endif /* CONFIG_PROC_FS */ | |
695 | ||
696 | /************************** IOCTL SUPPORT **************************/ | |
697 | /* | |
698 | * The original user space API to configure all those Wireless Extensions | |
699 | * is through IOCTLs. | |
700 | * In there, we check if we need to call the new driver API (iw_handler) | |
701 | * or just call the driver ioctl handler. | |
702 | */ | |
703 | ||
1da177e4 LT |
704 | /* ---------------------------------------------------------------- */ |
705 | /* | |
706 | * Wrapper to call a standard Wireless Extension handler. | |
707 | * We do various checks and also take care of moving data between | |
708 | * user space and kernel space. | |
709 | */ | |
711e2c33 JT |
710 | static int ioctl_standard_call(struct net_device * dev, |
711 | struct ifreq * ifr, | |
712 | unsigned int cmd, | |
713 | iw_handler handler) | |
1da177e4 LT |
714 | { |
715 | struct iwreq * iwr = (struct iwreq *) ifr; | |
716 | const struct iw_ioctl_description * descr; | |
717 | struct iw_request_info info; | |
718 | int ret = -EINVAL; | |
719 | ||
720 | /* Get the description of the IOCTL */ | |
e71a4783 | 721 | if ((cmd - SIOCIWFIRST) >= standard_ioctl_num) |
1da177e4 LT |
722 | return -EOPNOTSUPP; |
723 | descr = &(standard_ioctl[cmd - SIOCIWFIRST]); | |
724 | ||
1da177e4 LT |
725 | /* Prepare the call */ |
726 | info.cmd = cmd; | |
727 | info.flags = 0; | |
728 | ||
729 | /* Check if we have a pointer to user space data or not */ | |
e71a4783 | 730 | if (descr->header_type != IW_HEADER_TYPE_POINT) { |
1da177e4 LT |
731 | |
732 | /* No extra arguments. Trivial to handle */ | |
733 | ret = handler(dev, &info, &(iwr->u), NULL); | |
734 | ||
1da177e4 | 735 | /* Generate an event to notify listeners of the change */ |
e71a4783 | 736 | if ((descr->flags & IW_DESCR_FLAG_EVENT) && |
1da177e4 LT |
737 | ((ret == 0) || (ret == -EIWCOMMIT))) |
738 | wireless_send_event(dev, cmd, &(iwr->u), NULL); | |
1da177e4 LT |
739 | } else { |
740 | char * extra; | |
741 | int extra_size; | |
742 | int user_length = 0; | |
743 | int err; | |
98978edb | 744 | int essid_compat = 0; |
1da177e4 LT |
745 | |
746 | /* Calculate space needed by arguments. Always allocate | |
747 | * for max space. Easier, and won't last long... */ | |
748 | extra_size = descr->max_tokens * descr->token_size; | |
749 | ||
98978edb JL |
750 | /* Check need for ESSID compatibility for WE < 21 */ |
751 | switch (cmd) { | |
752 | case SIOCSIWESSID: | |
753 | case SIOCGIWESSID: | |
754 | case SIOCSIWNICKN: | |
755 | case SIOCGIWNICKN: | |
756 | if (iwr->u.data.length == descr->max_tokens + 1) | |
757 | essid_compat = 1; | |
758 | else if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) { | |
759 | char essid[IW_ESSID_MAX_SIZE + 1]; | |
760 | ||
761 | err = copy_from_user(essid, iwr->u.data.pointer, | |
762 | iwr->u.data.length * | |
763 | descr->token_size); | |
764 | if (err) | |
765 | return -EFAULT; | |
766 | ||
767 | if (essid[iwr->u.data.length - 1] == '\0') | |
768 | essid_compat = 1; | |
769 | } | |
770 | break; | |
771 | default: | |
772 | break; | |
773 | } | |
774 | ||
775 | iwr->u.data.length -= essid_compat; | |
776 | ||
1da177e4 | 777 | /* Check what user space is giving us */ |
e71a4783 | 778 | if (IW_IS_SET(cmd)) { |
1da177e4 | 779 | /* Check NULL pointer */ |
e71a4783 | 780 | if ((iwr->u.data.pointer == NULL) && |
1da177e4 LT |
781 | (iwr->u.data.length != 0)) |
782 | return -EFAULT; | |
783 | /* Check if number of token fits within bounds */ | |
e71a4783 | 784 | if (iwr->u.data.length > descr->max_tokens) |
1da177e4 | 785 | return -E2BIG; |
e71a4783 | 786 | if (iwr->u.data.length < descr->min_tokens) |
1da177e4 LT |
787 | return -EINVAL; |
788 | } else { | |
789 | /* Check NULL pointer */ | |
e71a4783 | 790 | if (iwr->u.data.pointer == NULL) |
1da177e4 LT |
791 | return -EFAULT; |
792 | /* Save user space buffer size for checking */ | |
793 | user_length = iwr->u.data.length; | |
794 | ||
795 | /* Don't check if user_length > max to allow forward | |
796 | * compatibility. The test user_length < min is | |
797 | * implied by the test at the end. */ | |
798 | ||
799 | /* Support for very large requests */ | |
e71a4783 | 800 | if ((descr->flags & IW_DESCR_FLAG_NOMAX) && |
1da177e4 LT |
801 | (user_length > descr->max_tokens)) { |
802 | /* Allow userspace to GET more than max so | |
803 | * we can support any size GET requests. | |
804 | * There is still a limit : -ENOMEM. */ | |
805 | extra_size = user_length * descr->token_size; | |
806 | /* Note : user_length is originally a __u16, | |
807 | * and token_size is controlled by us, | |
808 | * so extra_size won't get negative and | |
809 | * won't overflow... */ | |
810 | } | |
811 | } | |
812 | ||
1da177e4 | 813 | /* Create the kernel buffer */ |
98978edb JL |
814 | /* kzalloc ensures NULL-termination for essid_compat */ |
815 | extra = kzalloc(extra_size, GFP_KERNEL); | |
4d44e0df | 816 | if (extra == NULL) |
1da177e4 | 817 | return -ENOMEM; |
1da177e4 LT |
818 | |
819 | /* If it is a SET, get all the extra data in here */ | |
e71a4783 | 820 | if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) { |
1da177e4 LT |
821 | err = copy_from_user(extra, iwr->u.data.pointer, |
822 | iwr->u.data.length * | |
823 | descr->token_size); | |
824 | if (err) { | |
825 | kfree(extra); | |
826 | return -EFAULT; | |
827 | } | |
1da177e4 LT |
828 | } |
829 | ||
830 | /* Call the handler */ | |
831 | ret = handler(dev, &info, &(iwr->u), extra); | |
832 | ||
98978edb JL |
833 | iwr->u.data.length += essid_compat; |
834 | ||
1da177e4 LT |
835 | /* If we have something to return to the user */ |
836 | if (!ret && IW_IS_GET(cmd)) { | |
837 | /* Check if there is enough buffer up there */ | |
e71a4783 | 838 | if (user_length < iwr->u.data.length) { |
1da177e4 LT |
839 | kfree(extra); |
840 | return -E2BIG; | |
841 | } | |
842 | ||
843 | err = copy_to_user(iwr->u.data.pointer, extra, | |
844 | iwr->u.data.length * | |
845 | descr->token_size); | |
846 | if (err) | |
4ec93edb | 847 | ret = -EFAULT; |
1da177e4 LT |
848 | } |
849 | ||
1da177e4 | 850 | /* Generate an event to notify listeners of the change */ |
e71a4783 | 851 | if ((descr->flags & IW_DESCR_FLAG_EVENT) && |
1da177e4 | 852 | ((ret == 0) || (ret == -EIWCOMMIT))) { |
e71a4783 | 853 | if (descr->flags & IW_DESCR_FLAG_RESTRICT) |
1da177e4 LT |
854 | /* If the event is restricted, don't |
855 | * export the payload */ | |
856 | wireless_send_event(dev, cmd, &(iwr->u), NULL); | |
857 | else | |
858 | wireless_send_event(dev, cmd, &(iwr->u), | |
859 | extra); | |
860 | } | |
1da177e4 LT |
861 | |
862 | /* Cleanup - I told you it wasn't that long ;-) */ | |
863 | kfree(extra); | |
864 | } | |
865 | ||
866 | /* Call commit handler if needed and defined */ | |
e71a4783 | 867 | if (ret == -EIWCOMMIT) |
1da177e4 LT |
868 | ret = call_commit_handler(dev); |
869 | ||
870 | /* Here, we will generate the appropriate event if needed */ | |
871 | ||
872 | return ret; | |
873 | } | |
874 | ||
875 | /* ---------------------------------------------------------------- */ | |
876 | /* | |
877 | * Wrapper to call a private Wireless Extension handler. | |
878 | * We do various checks and also take care of moving data between | |
879 | * user space and kernel space. | |
880 | * It's not as nice and slimline as the standard wrapper. The cause | |
881 | * is struct iw_priv_args, which was not really designed for the | |
882 | * job we are going here. | |
883 | * | |
884 | * IMPORTANT : This function prevent to set and get data on the same | |
885 | * IOCTL and enforce the SET/GET convention. Not doing it would be | |
886 | * far too hairy... | |
887 | * If you need to set and get data at the same time, please don't use | |
888 | * a iw_handler but process it in your ioctl handler (i.e. use the | |
889 | * old driver API). | |
890 | */ | |
bdf51894 JB |
891 | static int ioctl_private_call(struct net_device *dev, struct ifreq *ifr, |
892 | unsigned int cmd, iw_handler handler) | |
1da177e4 LT |
893 | { |
894 | struct iwreq * iwr = (struct iwreq *) ifr; | |
895 | const struct iw_priv_args * descr = NULL; | |
896 | struct iw_request_info info; | |
897 | int extra_size = 0; | |
898 | int i; | |
899 | int ret = -EINVAL; | |
900 | ||
901 | /* Get the description of the IOCTL */ | |
e71a4783 SH |
902 | for (i = 0; i < dev->wireless_handlers->num_private_args; i++) |
903 | if (cmd == dev->wireless_handlers->private_args[i].cmd) { | |
1da177e4 LT |
904 | descr = &(dev->wireless_handlers->private_args[i]); |
905 | break; | |
906 | } | |
907 | ||
1da177e4 | 908 | /* Compute the size of the set/get arguments */ |
e71a4783 SH |
909 | if (descr != NULL) { |
910 | if (IW_IS_SET(cmd)) { | |
1da177e4 LT |
911 | int offset = 0; /* For sub-ioctls */ |
912 | /* Check for sub-ioctl handler */ | |
e71a4783 | 913 | if (descr->name[0] == '\0') |
1da177e4 LT |
914 | /* Reserve one int for sub-ioctl index */ |
915 | offset = sizeof(__u32); | |
916 | ||
917 | /* Size of set arguments */ | |
918 | extra_size = get_priv_size(descr->set_args); | |
919 | ||
920 | /* Does it fits in iwr ? */ | |
e71a4783 | 921 | if ((descr->set_args & IW_PRIV_SIZE_FIXED) && |
1da177e4 LT |
922 | ((extra_size + offset) <= IFNAMSIZ)) |
923 | extra_size = 0; | |
924 | } else { | |
925 | /* Size of get arguments */ | |
926 | extra_size = get_priv_size(descr->get_args); | |
927 | ||
928 | /* Does it fits in iwr ? */ | |
e71a4783 | 929 | if ((descr->get_args & IW_PRIV_SIZE_FIXED) && |
1da177e4 LT |
930 | (extra_size <= IFNAMSIZ)) |
931 | extra_size = 0; | |
932 | } | |
933 | } | |
934 | ||
935 | /* Prepare the call */ | |
936 | info.cmd = cmd; | |
937 | info.flags = 0; | |
938 | ||
939 | /* Check if we have a pointer to user space data or not. */ | |
e71a4783 | 940 | if (extra_size == 0) { |
1da177e4 LT |
941 | /* No extra arguments. Trivial to handle */ |
942 | ret = handler(dev, &info, &(iwr->u), (char *) &(iwr->u)); | |
943 | } else { | |
944 | char * extra; | |
945 | int err; | |
946 | ||
947 | /* Check what user space is giving us */ | |
e71a4783 | 948 | if (IW_IS_SET(cmd)) { |
1da177e4 | 949 | /* Check NULL pointer */ |
e71a4783 | 950 | if ((iwr->u.data.pointer == NULL) && |
1da177e4 LT |
951 | (iwr->u.data.length != 0)) |
952 | return -EFAULT; | |
953 | ||
954 | /* Does it fits within bounds ? */ | |
e71a4783 | 955 | if (iwr->u.data.length > (descr->set_args & |
1da177e4 LT |
956 | IW_PRIV_SIZE_MASK)) |
957 | return -E2BIG; | |
4d44e0df JB |
958 | } else if (iwr->u.data.pointer == NULL) |
959 | return -EFAULT; | |
1da177e4 | 960 | |
1da177e4 LT |
961 | /* Always allocate for max space. Easier, and won't last |
962 | * long... */ | |
963 | extra = kmalloc(extra_size, GFP_KERNEL); | |
4d44e0df | 964 | if (extra == NULL) |
1da177e4 | 965 | return -ENOMEM; |
1da177e4 LT |
966 | |
967 | /* If it is a SET, get all the extra data in here */ | |
e71a4783 | 968 | if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) { |
1da177e4 LT |
969 | err = copy_from_user(extra, iwr->u.data.pointer, |
970 | extra_size); | |
971 | if (err) { | |
972 | kfree(extra); | |
973 | return -EFAULT; | |
974 | } | |
1da177e4 LT |
975 | } |
976 | ||
977 | /* Call the handler */ | |
978 | ret = handler(dev, &info, &(iwr->u), extra); | |
979 | ||
980 | /* If we have something to return to the user */ | |
981 | if (!ret && IW_IS_GET(cmd)) { | |
982 | ||
983 | /* Adjust for the actual length if it's variable, | |
984 | * avoid leaking kernel bits outside. */ | |
985 | if (!(descr->get_args & IW_PRIV_SIZE_FIXED)) { | |
986 | extra_size = adjust_priv_size(descr->get_args, | |
987 | &(iwr->u)); | |
988 | } | |
989 | ||
990 | err = copy_to_user(iwr->u.data.pointer, extra, | |
991 | extra_size); | |
992 | if (err) | |
4ec93edb | 993 | ret = -EFAULT; |
1da177e4 LT |
994 | } |
995 | ||
996 | /* Cleanup - I told you it wasn't that long ;-) */ | |
997 | kfree(extra); | |
998 | } | |
999 | ||
1000 | ||
1001 | /* Call commit handler if needed and defined */ | |
e71a4783 | 1002 | if (ret == -EIWCOMMIT) |
1da177e4 LT |
1003 | ret = call_commit_handler(dev); |
1004 | ||
1005 | return ret; | |
1006 | } | |
1007 | ||
1008 | /* ---------------------------------------------------------------- */ | |
1009 | /* | |
295f4a1f | 1010 | * Main IOCTl dispatcher. |
1da177e4 LT |
1011 | * Check the type of IOCTL and call the appropriate wrapper... |
1012 | */ | |
295f4a1f | 1013 | static int wireless_process_ioctl(struct ifreq *ifr, unsigned int cmd) |
1da177e4 LT |
1014 | { |
1015 | struct net_device *dev; | |
1016 | iw_handler handler; | |
1017 | ||
1018 | /* Permissions are already checked in dev_ioctl() before calling us. | |
1019 | * The copy_to/from_user() of ifr is also dealt with in there */ | |
1020 | ||
1021 | /* Make sure the device exist */ | |
1022 | if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL) | |
1023 | return -ENODEV; | |
1024 | ||
1025 | /* A bunch of special cases, then the generic case... | |
1026 | * Note that 'cmd' is already filtered in dev_ioctl() with | |
1027 | * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */ | |
dd8ceabc JB |
1028 | if (cmd == SIOCGIWSTATS) |
1029 | return ioctl_standard_call(dev, ifr, cmd, | |
e71a4783 SH |
1030 | &iw_handler_get_iwstats); |
1031 | ||
dd8ceabc JB |
1032 | if (cmd == SIOCGIWPRIV && dev->wireless_handlers) |
1033 | return ioctl_standard_call(dev, ifr, cmd, | |
1034 | &iw_handler_get_private); | |
1035 | ||
1036 | /* Basic check */ | |
1037 | if (!netif_device_present(dev)) | |
1038 | return -ENODEV; | |
1039 | ||
1040 | /* New driver API : try to find the handler */ | |
1041 | handler = get_handler(dev, cmd); | |
1042 | if (handler) { | |
1043 | /* Standard and private are not the same */ | |
1044 | if (cmd < SIOCIWFIRSTPRIV) | |
1045 | return ioctl_standard_call(dev, ifr, cmd, handler); | |
1046 | else | |
1047 | return ioctl_private_call(dev, ifr, cmd, handler); | |
1da177e4 | 1048 | } |
dd8ceabc JB |
1049 | /* Old driver API : call driver ioctl handler */ |
1050 | if (dev->do_ioctl) | |
1051 | return dev->do_ioctl(dev, ifr, cmd); | |
1052 | return -EOPNOTSUPP; | |
1da177e4 LT |
1053 | } |
1054 | ||
295f4a1f JB |
1055 | /* entry point from dev ioctl */ |
1056 | int wext_handle_ioctl(struct ifreq *ifr, unsigned int cmd, | |
1057 | void __user *arg) | |
1058 | { | |
1059 | int ret; | |
1060 | ||
1061 | /* If command is `set a parameter', or | |
1062 | * `get the encoding parameters', check if | |
1063 | * the user has the right to do it */ | |
dd8ceabc JB |
1064 | if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE || cmd == SIOCGIWENCODEEXT) |
1065 | && !capable(CAP_NET_ADMIN)) | |
1066 | return -EPERM; | |
1067 | ||
295f4a1f JB |
1068 | dev_load(ifr->ifr_name); |
1069 | rtnl_lock(); | |
1070 | ret = wireless_process_ioctl(ifr, cmd); | |
1071 | rtnl_unlock(); | |
1072 | if (IW_IS_GET(cmd) && copy_to_user(arg, ifr, sizeof(struct ifreq))) | |
1073 | return -EFAULT; | |
1074 | return ret; | |
1075 | } | |
711e2c33 | 1076 | |
1da177e4 LT |
1077 | /************************* EVENT PROCESSING *************************/ |
1078 | /* | |
1079 | * Process events generated by the wireless layer or the driver. | |
1080 | * Most often, the event will be propagated through rtnetlink | |
1081 | */ | |
1082 | ||
baef1865 JL |
1083 | /* ---------------------------------------------------------------- */ |
1084 | /* | |
1085 | * Locking... | |
1086 | * ---------- | |
1087 | * | |
1088 | * Thanks to Herbert Xu <herbert@gondor.apana.org.au> for fixing | |
1089 | * the locking issue in here and implementing this code ! | |
1090 | * | |
1091 | * The issue : wireless_send_event() is often called in interrupt context, | |
1092 | * while the Netlink layer can never be called in interrupt context. | |
1093 | * The fully formed RtNetlink events are queued, and then a tasklet is run | |
1094 | * to feed those to Netlink. | |
1095 | * The skb_queue is interrupt safe, and its lock is not held while calling | |
1096 | * Netlink, so there is no possibility of dealock. | |
1097 | * Jean II | |
1098 | */ | |
1099 | ||
782a6675 HX |
1100 | static struct sk_buff_head wireless_nlevent_queue; |
1101 | ||
baef1865 JL |
1102 | static int __init wireless_nlevent_init(void) |
1103 | { | |
1104 | skb_queue_head_init(&wireless_nlevent_queue); | |
1105 | return 0; | |
1106 | } | |
1107 | ||
1108 | subsys_initcall(wireless_nlevent_init); | |
1109 | ||
782a6675 HX |
1110 | static void wireless_nlevent_process(unsigned long data) |
1111 | { | |
1112 | struct sk_buff *skb; | |
1113 | ||
1114 | while ((skb = skb_dequeue(&wireless_nlevent_queue))) | |
bd5785ba | 1115 | rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); |
782a6675 HX |
1116 | } |
1117 | ||
1118 | static DECLARE_TASKLET(wireless_nlevent_tasklet, wireless_nlevent_process, 0); | |
1119 | ||
1da177e4 LT |
1120 | /* ---------------------------------------------------------------- */ |
1121 | /* | |
1122 | * Fill a rtnetlink message with our event data. | |
1123 | * Note that we propage only the specified event and don't dump the | |
1124 | * current wireless config. Dumping the wireless config is far too | |
1125 | * expensive (for each parameter, the driver need to query the hardware). | |
1126 | */ | |
bdf51894 JB |
1127 | static int rtnetlink_fill_iwinfo(struct sk_buff *skb, struct net_device *dev, |
1128 | int type, char *event, int event_len) | |
1da177e4 LT |
1129 | { |
1130 | struct ifinfomsg *r; | |
1131 | struct nlmsghdr *nlh; | |
27a884dc | 1132 | unsigned char *b = skb_tail_pointer(skb); |
1da177e4 LT |
1133 | |
1134 | nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(*r)); | |
1135 | r = NLMSG_DATA(nlh); | |
1136 | r->ifi_family = AF_UNSPEC; | |
9ef1d4c7 | 1137 | r->__ifi_pad = 0; |
1da177e4 LT |
1138 | r->ifi_type = dev->type; |
1139 | r->ifi_index = dev->ifindex; | |
711e2c33 | 1140 | r->ifi_flags = dev_get_flags(dev); |
1da177e4 LT |
1141 | r->ifi_change = 0; /* Wireless changes don't affect those flags */ |
1142 | ||
1143 | /* Add the wireless events in the netlink packet */ | |
711e2c33 | 1144 | RTA_PUT(skb, IFLA_WIRELESS, event_len, event); |
1da177e4 | 1145 | |
27a884dc | 1146 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
1da177e4 LT |
1147 | return skb->len; |
1148 | ||
1149 | nlmsg_failure: | |
1150 | rtattr_failure: | |
dc5fc579 | 1151 | nlmsg_trim(skb, b); |
1da177e4 LT |
1152 | return -1; |
1153 | } | |
1154 | ||
1155 | /* ---------------------------------------------------------------- */ | |
1156 | /* | |
1157 | * Create and broadcast and send it on the standard rtnetlink socket | |
1158 | * This is a pure clone rtmsg_ifinfo() in net/core/rtnetlink.c | |
1159 | * Andrzej Krzysztofowicz mandated that I used a IFLA_XXX field | |
1160 | * within a RTM_NEWLINK event. | |
1161 | */ | |
bdf51894 | 1162 | static void rtmsg_iwinfo(struct net_device *dev, char *event, int event_len) |
1da177e4 LT |
1163 | { |
1164 | struct sk_buff *skb; | |
1165 | int size = NLMSG_GOODSIZE; | |
1166 | ||
1167 | skb = alloc_skb(size, GFP_ATOMIC); | |
1168 | if (!skb) | |
1169 | return; | |
1170 | ||
1171 | if (rtnetlink_fill_iwinfo(skb, dev, RTM_NEWLINK, | |
1172 | event, event_len) < 0) { | |
1173 | kfree_skb(skb); | |
1174 | return; | |
1175 | } | |
ac6d439d | 1176 | NETLINK_CB(skb).dst_group = RTNLGRP_LINK; |
782a6675 HX |
1177 | skb_queue_tail(&wireless_nlevent_queue, skb); |
1178 | tasklet_schedule(&wireless_nlevent_tasklet); | |
1179 | } | |
1180 | ||
1da177e4 LT |
1181 | /* ---------------------------------------------------------------- */ |
1182 | /* | |
1183 | * Main event dispatcher. Called from other parts and drivers. | |
1184 | * Send the event on the appropriate channels. | |
1185 | * May be called from interrupt context. | |
1186 | */ | |
1187 | void wireless_send_event(struct net_device * dev, | |
1188 | unsigned int cmd, | |
1189 | union iwreq_data * wrqu, | |
1190 | char * extra) | |
1191 | { | |
1192 | const struct iw_ioctl_description * descr = NULL; | |
1193 | int extra_len = 0; | |
1194 | struct iw_event *event; /* Mallocated whole event */ | |
1195 | int event_len; /* Its size */ | |
1196 | int hdr_len; /* Size of the event header */ | |
6582c164 | 1197 | int wrqu_off = 0; /* Offset in wrqu */ |
1da177e4 LT |
1198 | /* Don't "optimise" the following variable, it will crash */ |
1199 | unsigned cmd_index; /* *MUST* be unsigned */ | |
1200 | ||
6582c164 | 1201 | /* Get the description of the Event */ |
e71a4783 | 1202 | if (cmd <= SIOCIWLAST) { |
1da177e4 | 1203 | cmd_index = cmd - SIOCIWFIRST; |
e71a4783 | 1204 | if (cmd_index < standard_ioctl_num) |
1da177e4 LT |
1205 | descr = &(standard_ioctl[cmd_index]); |
1206 | } else { | |
1207 | cmd_index = cmd - IWEVFIRST; | |
e71a4783 | 1208 | if (cmd_index < standard_event_num) |
1da177e4 LT |
1209 | descr = &(standard_event[cmd_index]); |
1210 | } | |
1211 | /* Don't accept unknown events */ | |
e71a4783 | 1212 | if (descr == NULL) { |
1da177e4 LT |
1213 | /* Note : we don't return an error to the driver, because |
1214 | * the driver would not know what to do about it. It can't | |
1215 | * return an error to the user, because the event is not | |
1216 | * initiated by a user request. | |
1217 | * The best the driver could do is to log an error message. | |
1218 | * We will do it ourselves instead... | |
1219 | */ | |
4ec93edb | 1220 | printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n", |
1da177e4 LT |
1221 | dev->name, cmd); |
1222 | return; | |
1223 | } | |
1da177e4 LT |
1224 | |
1225 | /* Check extra parameters and set extra_len */ | |
e71a4783 | 1226 | if (descr->header_type == IW_HEADER_TYPE_POINT) { |
1da177e4 | 1227 | /* Check if number of token fits within bounds */ |
e71a4783 | 1228 | if (wrqu->data.length > descr->max_tokens) { |
4ec93edb | 1229 | printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length); |
1da177e4 LT |
1230 | return; |
1231 | } | |
e71a4783 | 1232 | if (wrqu->data.length < descr->min_tokens) { |
4ec93edb | 1233 | printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, wrqu->data.length); |
1da177e4 LT |
1234 | return; |
1235 | } | |
1236 | /* Calculate extra_len - extra is NULL for restricted events */ | |
e71a4783 | 1237 | if (extra != NULL) |
1da177e4 | 1238 | extra_len = wrqu->data.length * descr->token_size; |
6582c164 JT |
1239 | /* Always at an offset in wrqu */ |
1240 | wrqu_off = IW_EV_POINT_OFF; | |
1da177e4 LT |
1241 | } |
1242 | ||
1243 | /* Total length of the event */ | |
1244 | hdr_len = event_type_size[descr->header_type]; | |
1245 | event_len = hdr_len + extra_len; | |
1246 | ||
1da177e4 LT |
1247 | /* Create temporary buffer to hold the event */ |
1248 | event = kmalloc(event_len, GFP_ATOMIC); | |
e71a4783 | 1249 | if (event == NULL) |
1da177e4 LT |
1250 | return; |
1251 | ||
1252 | /* Fill event */ | |
1253 | event->len = event_len; | |
1254 | event->cmd = cmd; | |
6582c164 | 1255 | memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN); |
4d44e0df | 1256 | if (extra) |
1da177e4 LT |
1257 | memcpy(((char *) event) + hdr_len, extra, extra_len); |
1258 | ||
711e2c33 | 1259 | /* Send via the RtNetlink event channel */ |
1da177e4 | 1260 | rtmsg_iwinfo(dev, (char *) event, event_len); |
1da177e4 LT |
1261 | |
1262 | /* Cleanup */ | |
1263 | kfree(event); | |
1264 | ||
1265 | return; /* Always success, I guess ;-) */ | |
1266 | } | |
7a9df167 | 1267 | EXPORT_SYMBOL(wireless_send_event); |
1da177e4 LT |
1268 | |
1269 | /********************** ENHANCED IWSPY SUPPORT **********************/ | |
1270 | /* | |
1271 | * In the old days, the driver was handling spy support all by itself. | |
1272 | * Now, the driver can delegate this task to Wireless Extensions. | |
1273 | * It needs to use those standard spy iw_handler in struct iw_handler_def, | |
1274 | * push data to us via wireless_spy_update() and include struct iw_spy_data | |
6582c164 | 1275 | * in its private part (and export it in net_device->wireless_data->spy_data). |
1da177e4 LT |
1276 | * One of the main advantage of centralising spy support here is that |
1277 | * it becomes much easier to improve and extend it without having to touch | |
1278 | * the drivers. One example is the addition of the Spy-Threshold events. | |
1279 | */ | |
1280 | ||
1281 | /* ---------------------------------------------------------------- */ | |
1282 | /* | |
1283 | * Return the pointer to the spy data in the driver. | |
1284 | * Because this is called on the Rx path via wireless_spy_update(), | |
1285 | * we want it to be efficient... | |
1286 | */ | |
4d44e0df | 1287 | static inline struct iw_spy_data *get_spydata(struct net_device *dev) |
1da177e4 LT |
1288 | { |
1289 | /* This is the new way */ | |
e71a4783 | 1290 | if (dev->wireless_data) |
4d44e0df | 1291 | return dev->wireless_data->spy_data; |
6582c164 | 1292 | return NULL; |
1da177e4 LT |
1293 | } |
1294 | ||
1295 | /*------------------------------------------------------------------*/ | |
1296 | /* | |
1297 | * Standard Wireless Handler : set Spy List | |
1298 | */ | |
1299 | int iw_handler_set_spy(struct net_device * dev, | |
1300 | struct iw_request_info * info, | |
1301 | union iwreq_data * wrqu, | |
1302 | char * extra) | |
1303 | { | |
1304 | struct iw_spy_data * spydata = get_spydata(dev); | |
1305 | struct sockaddr * address = (struct sockaddr *) extra; | |
1306 | ||
1da177e4 | 1307 | /* Make sure driver is not buggy or using the old API */ |
e71a4783 | 1308 | if (!spydata) |
1da177e4 LT |
1309 | return -EOPNOTSUPP; |
1310 | ||
1311 | /* Disable spy collection while we copy the addresses. | |
1312 | * While we copy addresses, any call to wireless_spy_update() | |
1313 | * will NOP. This is OK, as anyway the addresses are changing. */ | |
1314 | spydata->spy_number = 0; | |
1315 | ||
1316 | /* We want to operate without locking, because wireless_spy_update() | |
1317 | * most likely will happen in the interrupt handler, and therefore | |
1318 | * have its own locking constraints and needs performance. | |
1319 | * The rtnl_lock() make sure we don't race with the other iw_handlers. | |
1320 | * This make sure wireless_spy_update() "see" that the spy list | |
1321 | * is temporarily disabled. */ | |
e16aa207 | 1322 | smp_wmb(); |
1da177e4 LT |
1323 | |
1324 | /* Are there are addresses to copy? */ | |
e71a4783 | 1325 | if (wrqu->data.length > 0) { |
1da177e4 LT |
1326 | int i; |
1327 | ||
1328 | /* Copy addresses */ | |
e71a4783 | 1329 | for (i = 0; i < wrqu->data.length; i++) |
1da177e4 LT |
1330 | memcpy(spydata->spy_address[i], address[i].sa_data, |
1331 | ETH_ALEN); | |
1332 | /* Reset stats */ | |
1333 | memset(spydata->spy_stat, 0, | |
1334 | sizeof(struct iw_quality) * IW_MAX_SPY); | |
1da177e4 LT |
1335 | } |
1336 | ||
1337 | /* Make sure above is updated before re-enabling */ | |
e16aa207 | 1338 | smp_wmb(); |
1da177e4 LT |
1339 | |
1340 | /* Enable addresses */ | |
1341 | spydata->spy_number = wrqu->data.length; | |
1342 | ||
1343 | return 0; | |
1344 | } | |
7a9df167 | 1345 | EXPORT_SYMBOL(iw_handler_set_spy); |
1da177e4 LT |
1346 | |
1347 | /*------------------------------------------------------------------*/ | |
1348 | /* | |
1349 | * Standard Wireless Handler : get Spy List | |
1350 | */ | |
1351 | int iw_handler_get_spy(struct net_device * dev, | |
1352 | struct iw_request_info * info, | |
1353 | union iwreq_data * wrqu, | |
1354 | char * extra) | |
1355 | { | |
1356 | struct iw_spy_data * spydata = get_spydata(dev); | |
1357 | struct sockaddr * address = (struct sockaddr *) extra; | |
1358 | int i; | |
1359 | ||
1360 | /* Make sure driver is not buggy or using the old API */ | |
e71a4783 | 1361 | if (!spydata) |
1da177e4 LT |
1362 | return -EOPNOTSUPP; |
1363 | ||
1364 | wrqu->data.length = spydata->spy_number; | |
1365 | ||
1366 | /* Copy addresses. */ | |
e71a4783 | 1367 | for (i = 0; i < spydata->spy_number; i++) { |
1da177e4 LT |
1368 | memcpy(address[i].sa_data, spydata->spy_address[i], ETH_ALEN); |
1369 | address[i].sa_family = AF_UNIX; | |
1370 | } | |
1371 | /* Copy stats to the user buffer (just after). */ | |
e71a4783 | 1372 | if (spydata->spy_number > 0) |
1da177e4 LT |
1373 | memcpy(extra + (sizeof(struct sockaddr) *spydata->spy_number), |
1374 | spydata->spy_stat, | |
1375 | sizeof(struct iw_quality) * spydata->spy_number); | |
1376 | /* Reset updated flags. */ | |
e71a4783 | 1377 | for (i = 0; i < spydata->spy_number; i++) |
6582c164 | 1378 | spydata->spy_stat[i].updated &= ~IW_QUAL_ALL_UPDATED; |
1da177e4 LT |
1379 | return 0; |
1380 | } | |
7a9df167 | 1381 | EXPORT_SYMBOL(iw_handler_get_spy); |
1da177e4 LT |
1382 | |
1383 | /*------------------------------------------------------------------*/ | |
1384 | /* | |
1385 | * Standard Wireless Handler : set spy threshold | |
1386 | */ | |
1387 | int iw_handler_set_thrspy(struct net_device * dev, | |
1388 | struct iw_request_info *info, | |
1389 | union iwreq_data * wrqu, | |
1390 | char * extra) | |
1391 | { | |
1392 | struct iw_spy_data * spydata = get_spydata(dev); | |
1393 | struct iw_thrspy * threshold = (struct iw_thrspy *) extra; | |
1394 | ||
1395 | /* Make sure driver is not buggy or using the old API */ | |
e71a4783 | 1396 | if (!spydata) |
1da177e4 LT |
1397 | return -EOPNOTSUPP; |
1398 | ||
1399 | /* Just do it */ | |
1400 | memcpy(&(spydata->spy_thr_low), &(threshold->low), | |
1401 | 2 * sizeof(struct iw_quality)); | |
1402 | ||
1403 | /* Clear flag */ | |
1404 | memset(spydata->spy_thr_under, '\0', sizeof(spydata->spy_thr_under)); | |
1405 | ||
1da177e4 LT |
1406 | return 0; |
1407 | } | |
7a9df167 | 1408 | EXPORT_SYMBOL(iw_handler_set_thrspy); |
1da177e4 LT |
1409 | |
1410 | /*------------------------------------------------------------------*/ | |
1411 | /* | |
1412 | * Standard Wireless Handler : get spy threshold | |
1413 | */ | |
1414 | int iw_handler_get_thrspy(struct net_device * dev, | |
1415 | struct iw_request_info *info, | |
1416 | union iwreq_data * wrqu, | |
1417 | char * extra) | |
1418 | { | |
1419 | struct iw_spy_data * spydata = get_spydata(dev); | |
1420 | struct iw_thrspy * threshold = (struct iw_thrspy *) extra; | |
1421 | ||
1422 | /* Make sure driver is not buggy or using the old API */ | |
e71a4783 | 1423 | if (!spydata) |
1da177e4 LT |
1424 | return -EOPNOTSUPP; |
1425 | ||
1426 | /* Just do it */ | |
1427 | memcpy(&(threshold->low), &(spydata->spy_thr_low), | |
1428 | 2 * sizeof(struct iw_quality)); | |
1429 | ||
1430 | return 0; | |
1431 | } | |
7a9df167 | 1432 | EXPORT_SYMBOL(iw_handler_get_thrspy); |
1da177e4 LT |
1433 | |
1434 | /*------------------------------------------------------------------*/ | |
1435 | /* | |
1436 | * Prepare and send a Spy Threshold event | |
1437 | */ | |
1438 | static void iw_send_thrspy_event(struct net_device * dev, | |
1439 | struct iw_spy_data * spydata, | |
1440 | unsigned char * address, | |
1441 | struct iw_quality * wstats) | |
1442 | { | |
1443 | union iwreq_data wrqu; | |
1444 | struct iw_thrspy threshold; | |
1445 | ||
1446 | /* Init */ | |
1447 | wrqu.data.length = 1; | |
1448 | wrqu.data.flags = 0; | |
1449 | /* Copy address */ | |
1450 | memcpy(threshold.addr.sa_data, address, ETH_ALEN); | |
1451 | threshold.addr.sa_family = ARPHRD_ETHER; | |
1452 | /* Copy stats */ | |
1453 | memcpy(&(threshold.qual), wstats, sizeof(struct iw_quality)); | |
1454 | /* Copy also thresholds */ | |
1455 | memcpy(&(threshold.low), &(spydata->spy_thr_low), | |
1456 | 2 * sizeof(struct iw_quality)); | |
1457 | ||
1da177e4 LT |
1458 | /* Send event to user space */ |
1459 | wireless_send_event(dev, SIOCGIWTHRSPY, &wrqu, (char *) &threshold); | |
1460 | } | |
1461 | ||
1462 | /* ---------------------------------------------------------------- */ | |
1463 | /* | |
1464 | * Call for the driver to update the spy data. | |
1465 | * For now, the spy data is a simple array. As the size of the array is | |
1466 | * small, this is good enough. If we wanted to support larger number of | |
1467 | * spy addresses, we should use something more efficient... | |
1468 | */ | |
1469 | void wireless_spy_update(struct net_device * dev, | |
1470 | unsigned char * address, | |
1471 | struct iw_quality * wstats) | |
1472 | { | |
1473 | struct iw_spy_data * spydata = get_spydata(dev); | |
1474 | int i; | |
1475 | int match = -1; | |
1476 | ||
1477 | /* Make sure driver is not buggy or using the old API */ | |
e71a4783 | 1478 | if (!spydata) |
1da177e4 LT |
1479 | return; |
1480 | ||
1da177e4 | 1481 | /* Update all records that match */ |
e71a4783 SH |
1482 | for (i = 0; i < spydata->spy_number; i++) |
1483 | if (!compare_ether_addr(address, spydata->spy_address[i])) { | |
1da177e4 LT |
1484 | memcpy(&(spydata->spy_stat[i]), wstats, |
1485 | sizeof(struct iw_quality)); | |
1486 | match = i; | |
1487 | } | |
1488 | ||
1489 | /* Generate an event if we cross the spy threshold. | |
1490 | * To avoid event storms, we have a simple hysteresis : we generate | |
1491 | * event only when we go under the low threshold or above the | |
1492 | * high threshold. */ | |
e71a4783 SH |
1493 | if (match >= 0) { |
1494 | if (spydata->spy_thr_under[match]) { | |
1495 | if (wstats->level > spydata->spy_thr_high.level) { | |
1da177e4 LT |
1496 | spydata->spy_thr_under[match] = 0; |
1497 | iw_send_thrspy_event(dev, spydata, | |
1498 | address, wstats); | |
1499 | } | |
1500 | } else { | |
e71a4783 | 1501 | if (wstats->level < spydata->spy_thr_low.level) { |
1da177e4 LT |
1502 | spydata->spy_thr_under[match] = 1; |
1503 | iw_send_thrspy_event(dev, spydata, | |
1504 | address, wstats); | |
1505 | } | |
1506 | } | |
1507 | } | |
1508 | } | |
1da177e4 | 1509 | EXPORT_SYMBOL(wireless_spy_update); |