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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> | |
711e2c33 | 5 | * Copyright (c) 1997-2006 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() | |
1da177e4 LT |
79 | */ |
80 | ||
81 | /***************************** INCLUDES *****************************/ | |
82 | ||
1da177e4 LT |
83 | #include <linux/module.h> |
84 | #include <linux/types.h> /* off_t */ | |
85 | #include <linux/netdevice.h> /* struct ifreq, dev_get_by_name() */ | |
86 | #include <linux/proc_fs.h> | |
87 | #include <linux/rtnetlink.h> /* rtnetlink stuff */ | |
88 | #include <linux/seq_file.h> | |
89 | #include <linux/init.h> /* for __init */ | |
90 | #include <linux/if_arp.h> /* ARPHRD_ETHER */ | |
9819d85c | 91 | #include <linux/etherdevice.h> /* compare_ether_addr */ |
782a6675 | 92 | #include <linux/interrupt.h> |
1da177e4 LT |
93 | |
94 | #include <linux/wireless.h> /* Pretty obvious */ | |
95 | #include <net/iw_handler.h> /* New driver API */ | |
bd5785ba | 96 | #include <net/netlink.h> |
1da177e4 LT |
97 | |
98 | #include <asm/uaccess.h> /* copy_to_user() */ | |
99 | ||
100 | /**************************** CONSTANTS ****************************/ | |
101 | ||
102 | /* Debugging stuff */ | |
103 | #undef WE_IOCTL_DEBUG /* Debug IOCTL API */ | |
711e2c33 | 104 | #undef WE_RTNETLINK_DEBUG /* Debug RtNetlink API */ |
1da177e4 LT |
105 | #undef WE_EVENT_DEBUG /* Debug Event dispatcher */ |
106 | #undef WE_SPY_DEBUG /* Debug enhanced spy support */ | |
107 | ||
108 | /* Options */ | |
711e2c33 JT |
109 | //CONFIG_NET_WIRELESS_RTNETLINK /* Wireless requests over RtNetlink */ |
110 | #define WE_EVENT_RTNETLINK /* Propagate events using RtNetlink */ | |
1da177e4 LT |
111 | #define WE_SET_EVENT /* Generate an event on some set commands */ |
112 | ||
113 | /************************* GLOBAL VARIABLES *************************/ | |
114 | /* | |
115 | * You should not use global variables, because of re-entrancy. | |
116 | * On our case, it's only const, so it's OK... | |
117 | */ | |
118 | /* | |
119 | * Meta-data about all the standard Wireless Extension request we | |
120 | * know about. | |
121 | */ | |
122 | static const struct iw_ioctl_description standard_ioctl[] = { | |
123 | [SIOCSIWCOMMIT - SIOCIWFIRST] = { | |
124 | .header_type = IW_HEADER_TYPE_NULL, | |
125 | }, | |
126 | [SIOCGIWNAME - SIOCIWFIRST] = { | |
127 | .header_type = IW_HEADER_TYPE_CHAR, | |
128 | .flags = IW_DESCR_FLAG_DUMP, | |
129 | }, | |
130 | [SIOCSIWNWID - SIOCIWFIRST] = { | |
131 | .header_type = IW_HEADER_TYPE_PARAM, | |
132 | .flags = IW_DESCR_FLAG_EVENT, | |
133 | }, | |
134 | [SIOCGIWNWID - SIOCIWFIRST] = { | |
135 | .header_type = IW_HEADER_TYPE_PARAM, | |
136 | .flags = IW_DESCR_FLAG_DUMP, | |
137 | }, | |
138 | [SIOCSIWFREQ - SIOCIWFIRST] = { | |
139 | .header_type = IW_HEADER_TYPE_FREQ, | |
140 | .flags = IW_DESCR_FLAG_EVENT, | |
141 | }, | |
142 | [SIOCGIWFREQ - SIOCIWFIRST] = { | |
143 | .header_type = IW_HEADER_TYPE_FREQ, | |
144 | .flags = IW_DESCR_FLAG_DUMP, | |
145 | }, | |
146 | [SIOCSIWMODE - SIOCIWFIRST] = { | |
147 | .header_type = IW_HEADER_TYPE_UINT, | |
148 | .flags = IW_DESCR_FLAG_EVENT, | |
149 | }, | |
150 | [SIOCGIWMODE - SIOCIWFIRST] = { | |
151 | .header_type = IW_HEADER_TYPE_UINT, | |
152 | .flags = IW_DESCR_FLAG_DUMP, | |
153 | }, | |
154 | [SIOCSIWSENS - SIOCIWFIRST] = { | |
155 | .header_type = IW_HEADER_TYPE_PARAM, | |
156 | }, | |
157 | [SIOCGIWSENS - SIOCIWFIRST] = { | |
158 | .header_type = IW_HEADER_TYPE_PARAM, | |
159 | }, | |
160 | [SIOCSIWRANGE - SIOCIWFIRST] = { | |
161 | .header_type = IW_HEADER_TYPE_NULL, | |
162 | }, | |
163 | [SIOCGIWRANGE - SIOCIWFIRST] = { | |
164 | .header_type = IW_HEADER_TYPE_POINT, | |
165 | .token_size = 1, | |
166 | .max_tokens = sizeof(struct iw_range), | |
167 | .flags = IW_DESCR_FLAG_DUMP, | |
168 | }, | |
169 | [SIOCSIWPRIV - SIOCIWFIRST] = { | |
170 | .header_type = IW_HEADER_TYPE_NULL, | |
171 | }, | |
172 | [SIOCGIWPRIV - SIOCIWFIRST] = { /* (handled directly by us) */ | |
711e2c33 JT |
173 | .header_type = IW_HEADER_TYPE_POINT, |
174 | .token_size = sizeof(struct iw_priv_args), | |
175 | .max_tokens = 16, | |
176 | .flags = IW_DESCR_FLAG_NOMAX, | |
1da177e4 LT |
177 | }, |
178 | [SIOCSIWSTATS - SIOCIWFIRST] = { | |
179 | .header_type = IW_HEADER_TYPE_NULL, | |
180 | }, | |
181 | [SIOCGIWSTATS - SIOCIWFIRST] = { /* (handled directly by us) */ | |
711e2c33 JT |
182 | .header_type = IW_HEADER_TYPE_POINT, |
183 | .token_size = 1, | |
184 | .max_tokens = sizeof(struct iw_statistics), | |
1da177e4 LT |
185 | .flags = IW_DESCR_FLAG_DUMP, |
186 | }, | |
187 | [SIOCSIWSPY - SIOCIWFIRST] = { | |
188 | .header_type = IW_HEADER_TYPE_POINT, | |
189 | .token_size = sizeof(struct sockaddr), | |
190 | .max_tokens = IW_MAX_SPY, | |
191 | }, | |
192 | [SIOCGIWSPY - SIOCIWFIRST] = { | |
193 | .header_type = IW_HEADER_TYPE_POINT, | |
194 | .token_size = sizeof(struct sockaddr) + | |
195 | sizeof(struct iw_quality), | |
196 | .max_tokens = IW_MAX_SPY, | |
197 | }, | |
198 | [SIOCSIWTHRSPY - SIOCIWFIRST] = { | |
199 | .header_type = IW_HEADER_TYPE_POINT, | |
200 | .token_size = sizeof(struct iw_thrspy), | |
201 | .min_tokens = 1, | |
202 | .max_tokens = 1, | |
203 | }, | |
204 | [SIOCGIWTHRSPY - SIOCIWFIRST] = { | |
205 | .header_type = IW_HEADER_TYPE_POINT, | |
206 | .token_size = sizeof(struct iw_thrspy), | |
207 | .min_tokens = 1, | |
208 | .max_tokens = 1, | |
209 | }, | |
210 | [SIOCSIWAP - SIOCIWFIRST] = { | |
211 | .header_type = IW_HEADER_TYPE_ADDR, | |
212 | }, | |
213 | [SIOCGIWAP - SIOCIWFIRST] = { | |
214 | .header_type = IW_HEADER_TYPE_ADDR, | |
215 | .flags = IW_DESCR_FLAG_DUMP, | |
216 | }, | |
fff9cfd9 JT |
217 | [SIOCSIWMLME - SIOCIWFIRST] = { |
218 | .header_type = IW_HEADER_TYPE_POINT, | |
219 | .token_size = 1, | |
220 | .min_tokens = sizeof(struct iw_mlme), | |
221 | .max_tokens = sizeof(struct iw_mlme), | |
222 | }, | |
1da177e4 LT |
223 | [SIOCGIWAPLIST - SIOCIWFIRST] = { |
224 | .header_type = IW_HEADER_TYPE_POINT, | |
225 | .token_size = sizeof(struct sockaddr) + | |
226 | sizeof(struct iw_quality), | |
227 | .max_tokens = IW_MAX_AP, | |
228 | .flags = IW_DESCR_FLAG_NOMAX, | |
229 | }, | |
230 | [SIOCSIWSCAN - SIOCIWFIRST] = { | |
fff9cfd9 JT |
231 | .header_type = IW_HEADER_TYPE_POINT, |
232 | .token_size = 1, | |
233 | .min_tokens = 0, | |
234 | .max_tokens = sizeof(struct iw_scan_req), | |
1da177e4 LT |
235 | }, |
236 | [SIOCGIWSCAN - SIOCIWFIRST] = { | |
237 | .header_type = IW_HEADER_TYPE_POINT, | |
238 | .token_size = 1, | |
239 | .max_tokens = IW_SCAN_MAX_DATA, | |
240 | .flags = IW_DESCR_FLAG_NOMAX, | |
241 | }, | |
242 | [SIOCSIWESSID - SIOCIWFIRST] = { | |
243 | .header_type = IW_HEADER_TYPE_POINT, | |
244 | .token_size = 1, | |
baef1865 | 245 | .max_tokens = IW_ESSID_MAX_SIZE, |
1da177e4 LT |
246 | .flags = IW_DESCR_FLAG_EVENT, |
247 | }, | |
248 | [SIOCGIWESSID - SIOCIWFIRST] = { | |
249 | .header_type = IW_HEADER_TYPE_POINT, | |
250 | .token_size = 1, | |
baef1865 | 251 | .max_tokens = IW_ESSID_MAX_SIZE, |
1da177e4 LT |
252 | .flags = IW_DESCR_FLAG_DUMP, |
253 | }, | |
254 | [SIOCSIWNICKN - SIOCIWFIRST] = { | |
255 | .header_type = IW_HEADER_TYPE_POINT, | |
256 | .token_size = 1, | |
baef1865 | 257 | .max_tokens = IW_ESSID_MAX_SIZE, |
1da177e4 LT |
258 | }, |
259 | [SIOCGIWNICKN - SIOCIWFIRST] = { | |
260 | .header_type = IW_HEADER_TYPE_POINT, | |
261 | .token_size = 1, | |
baef1865 | 262 | .max_tokens = IW_ESSID_MAX_SIZE, |
1da177e4 LT |
263 | }, |
264 | [SIOCSIWRATE - SIOCIWFIRST] = { | |
265 | .header_type = IW_HEADER_TYPE_PARAM, | |
266 | }, | |
267 | [SIOCGIWRATE - SIOCIWFIRST] = { | |
268 | .header_type = IW_HEADER_TYPE_PARAM, | |
269 | }, | |
270 | [SIOCSIWRTS - SIOCIWFIRST] = { | |
271 | .header_type = IW_HEADER_TYPE_PARAM, | |
272 | }, | |
273 | [SIOCGIWRTS - SIOCIWFIRST] = { | |
274 | .header_type = IW_HEADER_TYPE_PARAM, | |
275 | }, | |
276 | [SIOCSIWFRAG - SIOCIWFIRST] = { | |
277 | .header_type = IW_HEADER_TYPE_PARAM, | |
278 | }, | |
279 | [SIOCGIWFRAG - SIOCIWFIRST] = { | |
280 | .header_type = IW_HEADER_TYPE_PARAM, | |
281 | }, | |
282 | [SIOCSIWTXPOW - SIOCIWFIRST] = { | |
283 | .header_type = IW_HEADER_TYPE_PARAM, | |
284 | }, | |
285 | [SIOCGIWTXPOW - SIOCIWFIRST] = { | |
286 | .header_type = IW_HEADER_TYPE_PARAM, | |
287 | }, | |
288 | [SIOCSIWRETRY - SIOCIWFIRST] = { | |
289 | .header_type = IW_HEADER_TYPE_PARAM, | |
290 | }, | |
291 | [SIOCGIWRETRY - SIOCIWFIRST] = { | |
292 | .header_type = IW_HEADER_TYPE_PARAM, | |
293 | }, | |
294 | [SIOCSIWENCODE - SIOCIWFIRST] = { | |
295 | .header_type = IW_HEADER_TYPE_POINT, | |
296 | .token_size = 1, | |
297 | .max_tokens = IW_ENCODING_TOKEN_MAX, | |
298 | .flags = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT, | |
299 | }, | |
300 | [SIOCGIWENCODE - SIOCIWFIRST] = { | |
301 | .header_type = IW_HEADER_TYPE_POINT, | |
302 | .token_size = 1, | |
303 | .max_tokens = IW_ENCODING_TOKEN_MAX, | |
304 | .flags = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT, | |
305 | }, | |
306 | [SIOCSIWPOWER - SIOCIWFIRST] = { | |
307 | .header_type = IW_HEADER_TYPE_PARAM, | |
308 | }, | |
309 | [SIOCGIWPOWER - SIOCIWFIRST] = { | |
310 | .header_type = IW_HEADER_TYPE_PARAM, | |
311 | }, | |
fff9cfd9 JT |
312 | [SIOCSIWGENIE - SIOCIWFIRST] = { |
313 | .header_type = IW_HEADER_TYPE_POINT, | |
314 | .token_size = 1, | |
315 | .max_tokens = IW_GENERIC_IE_MAX, | |
316 | }, | |
317 | [SIOCGIWGENIE - SIOCIWFIRST] = { | |
318 | .header_type = IW_HEADER_TYPE_POINT, | |
319 | .token_size = 1, | |
320 | .max_tokens = IW_GENERIC_IE_MAX, | |
321 | }, | |
322 | [SIOCSIWAUTH - SIOCIWFIRST] = { | |
323 | .header_type = IW_HEADER_TYPE_PARAM, | |
324 | }, | |
325 | [SIOCGIWAUTH - SIOCIWFIRST] = { | |
326 | .header_type = IW_HEADER_TYPE_PARAM, | |
327 | }, | |
328 | [SIOCSIWENCODEEXT - SIOCIWFIRST] = { | |
329 | .header_type = IW_HEADER_TYPE_POINT, | |
330 | .token_size = 1, | |
331 | .min_tokens = sizeof(struct iw_encode_ext), | |
332 | .max_tokens = sizeof(struct iw_encode_ext) + | |
333 | IW_ENCODING_TOKEN_MAX, | |
334 | }, | |
335 | [SIOCGIWENCODEEXT - SIOCIWFIRST] = { | |
336 | .header_type = IW_HEADER_TYPE_POINT, | |
337 | .token_size = 1, | |
338 | .min_tokens = sizeof(struct iw_encode_ext), | |
339 | .max_tokens = sizeof(struct iw_encode_ext) + | |
340 | IW_ENCODING_TOKEN_MAX, | |
341 | }, | |
342 | [SIOCSIWPMKSA - SIOCIWFIRST] = { | |
343 | .header_type = IW_HEADER_TYPE_POINT, | |
344 | .token_size = 1, | |
345 | .min_tokens = sizeof(struct iw_pmksa), | |
346 | .max_tokens = sizeof(struct iw_pmksa), | |
347 | }, | |
1da177e4 | 348 | }; |
baef1865 JL |
349 | static const unsigned standard_ioctl_num = (sizeof(standard_ioctl) / |
350 | sizeof(struct iw_ioctl_description)); | |
1da177e4 LT |
351 | |
352 | /* | |
353 | * Meta-data about all the additional standard Wireless Extension events | |
354 | * we know about. | |
355 | */ | |
356 | static const struct iw_ioctl_description standard_event[] = { | |
357 | [IWEVTXDROP - IWEVFIRST] = { | |
358 | .header_type = IW_HEADER_TYPE_ADDR, | |
359 | }, | |
360 | [IWEVQUAL - IWEVFIRST] = { | |
361 | .header_type = IW_HEADER_TYPE_QUAL, | |
362 | }, | |
363 | [IWEVCUSTOM - IWEVFIRST] = { | |
364 | .header_type = IW_HEADER_TYPE_POINT, | |
365 | .token_size = 1, | |
366 | .max_tokens = IW_CUSTOM_MAX, | |
367 | }, | |
368 | [IWEVREGISTERED - IWEVFIRST] = { | |
369 | .header_type = IW_HEADER_TYPE_ADDR, | |
370 | }, | |
371 | [IWEVEXPIRED - IWEVFIRST] = { | |
372 | .header_type = IW_HEADER_TYPE_ADDR, | |
373 | }, | |
fff9cfd9 JT |
374 | [IWEVGENIE - IWEVFIRST] = { |
375 | .header_type = IW_HEADER_TYPE_POINT, | |
376 | .token_size = 1, | |
377 | .max_tokens = IW_GENERIC_IE_MAX, | |
378 | }, | |
379 | [IWEVMICHAELMICFAILURE - IWEVFIRST] = { | |
380 | .header_type = IW_HEADER_TYPE_POINT, | |
381 | .token_size = 1, | |
382 | .max_tokens = sizeof(struct iw_michaelmicfailure), | |
383 | }, | |
384 | [IWEVASSOCREQIE - IWEVFIRST] = { | |
385 | .header_type = IW_HEADER_TYPE_POINT, | |
386 | .token_size = 1, | |
387 | .max_tokens = IW_GENERIC_IE_MAX, | |
388 | }, | |
389 | [IWEVASSOCRESPIE - IWEVFIRST] = { | |
390 | .header_type = IW_HEADER_TYPE_POINT, | |
391 | .token_size = 1, | |
392 | .max_tokens = IW_GENERIC_IE_MAX, | |
393 | }, | |
394 | [IWEVPMKIDCAND - IWEVFIRST] = { | |
395 | .header_type = IW_HEADER_TYPE_POINT, | |
396 | .token_size = 1, | |
397 | .max_tokens = sizeof(struct iw_pmkid_cand), | |
398 | }, | |
1da177e4 | 399 | }; |
baef1865 JL |
400 | static const unsigned standard_event_num = (sizeof(standard_event) / |
401 | sizeof(struct iw_ioctl_description)); | |
1da177e4 LT |
402 | |
403 | /* Size (in bytes) of the various private data types */ | |
404 | static const char iw_priv_type_size[] = { | |
405 | 0, /* IW_PRIV_TYPE_NONE */ | |
406 | 1, /* IW_PRIV_TYPE_BYTE */ | |
407 | 1, /* IW_PRIV_TYPE_CHAR */ | |
408 | 0, /* Not defined */ | |
409 | sizeof(__u32), /* IW_PRIV_TYPE_INT */ | |
410 | sizeof(struct iw_freq), /* IW_PRIV_TYPE_FLOAT */ | |
411 | sizeof(struct sockaddr), /* IW_PRIV_TYPE_ADDR */ | |
412 | 0, /* Not defined */ | |
413 | }; | |
414 | ||
415 | /* Size (in bytes) of various events */ | |
416 | static const int event_type_size[] = { | |
417 | IW_EV_LCP_LEN, /* IW_HEADER_TYPE_NULL */ | |
418 | 0, | |
419 | IW_EV_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */ | |
420 | 0, | |
421 | IW_EV_UINT_LEN, /* IW_HEADER_TYPE_UINT */ | |
422 | IW_EV_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */ | |
423 | IW_EV_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */ | |
424 | 0, | |
425 | IW_EV_POINT_LEN, /* Without variable payload */ | |
426 | IW_EV_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */ | |
427 | IW_EV_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */ | |
428 | }; | |
429 | ||
430 | /************************ COMMON SUBROUTINES ************************/ | |
431 | /* | |
432 | * Stuff that may be used in various place or doesn't fit in one | |
433 | * of the section below. | |
434 | */ | |
435 | ||
436 | /* ---------------------------------------------------------------- */ | |
437 | /* | |
438 | * Return the driver handler associated with a specific Wireless Extension. | |
439 | * Called from various place, so make sure it remains efficient. | |
440 | */ | |
441 | static inline iw_handler get_handler(struct net_device *dev, | |
442 | unsigned int cmd) | |
443 | { | |
444 | /* Don't "optimise" the following variable, it will crash */ | |
445 | unsigned int index; /* *MUST* be unsigned */ | |
446 | ||
447 | /* Check if we have some wireless handlers defined */ | |
448 | if(dev->wireless_handlers == NULL) | |
449 | return NULL; | |
450 | ||
451 | /* Try as a standard command */ | |
452 | index = cmd - SIOCIWFIRST; | |
453 | if(index < dev->wireless_handlers->num_standard) | |
454 | return dev->wireless_handlers->standard[index]; | |
455 | ||
456 | /* Try as a private command */ | |
457 | index = cmd - SIOCIWFIRSTPRIV; | |
458 | if(index < dev->wireless_handlers->num_private) | |
459 | return dev->wireless_handlers->private[index]; | |
460 | ||
461 | /* Not found */ | |
462 | return NULL; | |
463 | } | |
464 | ||
465 | /* ---------------------------------------------------------------- */ | |
466 | /* | |
467 | * Get statistics out of the driver | |
468 | */ | |
469 | static inline struct iw_statistics *get_wireless_stats(struct net_device *dev) | |
470 | { | |
471 | /* New location */ | |
472 | if((dev->wireless_handlers != NULL) && | |
473 | (dev->wireless_handlers->get_wireless_stats != NULL)) | |
474 | return dev->wireless_handlers->get_wireless_stats(dev); | |
475 | ||
6582c164 JT |
476 | /* Not found */ |
477 | return (struct iw_statistics *) NULL; | |
1da177e4 LT |
478 | } |
479 | ||
480 | /* ---------------------------------------------------------------- */ | |
481 | /* | |
482 | * Call the commit handler in the driver | |
483 | * (if exist and if conditions are right) | |
484 | * | |
485 | * Note : our current commit strategy is currently pretty dumb, | |
486 | * but we will be able to improve on that... | |
487 | * The goal is to try to agreagate as many changes as possible | |
488 | * before doing the commit. Drivers that will define a commit handler | |
489 | * are usually those that need a reset after changing parameters, so | |
490 | * we want to minimise the number of reset. | |
491 | * A cool idea is to use a timer : at each "set" command, we re-set the | |
492 | * timer, when the timer eventually fires, we call the driver. | |
493 | * Hopefully, more on that later. | |
494 | * | |
495 | * Also, I'm waiting to see how many people will complain about the | |
496 | * netif_running(dev) test. I'm open on that one... | |
497 | * Hopefully, the driver will remember to do a commit in "open()" ;-) | |
498 | */ | |
499 | static inline int call_commit_handler(struct net_device * dev) | |
500 | { | |
501 | if((netif_running(dev)) && | |
502 | (dev->wireless_handlers->standard[0] != NULL)) { | |
503 | /* Call the commit handler on the driver */ | |
504 | return dev->wireless_handlers->standard[0](dev, NULL, | |
505 | NULL, NULL); | |
506 | } else | |
507 | return 0; /* Command completed successfully */ | |
508 | } | |
509 | ||
510 | /* ---------------------------------------------------------------- */ | |
511 | /* | |
512 | * Calculate size of private arguments | |
513 | */ | |
514 | static inline int get_priv_size(__u16 args) | |
515 | { | |
516 | int num = args & IW_PRIV_SIZE_MASK; | |
517 | int type = (args & IW_PRIV_TYPE_MASK) >> 12; | |
518 | ||
519 | return num * iw_priv_type_size[type]; | |
520 | } | |
521 | ||
522 | /* ---------------------------------------------------------------- */ | |
523 | /* | |
524 | * Re-calculate the size of private arguments | |
525 | */ | |
526 | static inline int adjust_priv_size(__u16 args, | |
527 | union iwreq_data * wrqu) | |
528 | { | |
529 | int num = wrqu->data.length; | |
530 | int max = args & IW_PRIV_SIZE_MASK; | |
531 | int type = (args & IW_PRIV_TYPE_MASK) >> 12; | |
532 | ||
533 | /* Make sure the driver doesn't goof up */ | |
534 | if (max < num) | |
535 | num = max; | |
536 | ||
537 | return num * iw_priv_type_size[type]; | |
538 | } | |
539 | ||
711e2c33 JT |
540 | /* ---------------------------------------------------------------- */ |
541 | /* | |
542 | * Standard Wireless Handler : get wireless stats | |
543 | * Allow programatic access to /proc/net/wireless even if /proc | |
544 | * doesn't exist... Also more efficient... | |
545 | */ | |
546 | static int iw_handler_get_iwstats(struct net_device * dev, | |
547 | struct iw_request_info * info, | |
548 | union iwreq_data * wrqu, | |
549 | char * extra) | |
550 | { | |
551 | /* Get stats from the driver */ | |
552 | struct iw_statistics *stats; | |
553 | ||
554 | stats = get_wireless_stats(dev); | |
555 | if (stats != (struct iw_statistics *) NULL) { | |
556 | ||
557 | /* Copy statistics to extra */ | |
558 | memcpy(extra, stats, sizeof(struct iw_statistics)); | |
559 | wrqu->data.length = sizeof(struct iw_statistics); | |
560 | ||
561 | /* Check if we need to clear the updated flag */ | |
562 | if(wrqu->data.flags != 0) | |
563 | stats->qual.updated &= ~IW_QUAL_ALL_UPDATED; | |
564 | return 0; | |
565 | } else | |
566 | return -EOPNOTSUPP; | |
567 | } | |
568 | ||
569 | /* ---------------------------------------------------------------- */ | |
570 | /* | |
571 | * Standard Wireless Handler : get iwpriv definitions | |
572 | * Export the driver private handler definition | |
573 | * They will be picked up by tools like iwpriv... | |
574 | */ | |
575 | static int iw_handler_get_private(struct net_device * dev, | |
576 | struct iw_request_info * info, | |
577 | union iwreq_data * wrqu, | |
578 | char * extra) | |
579 | { | |
580 | /* Check if the driver has something to export */ | |
581 | if((dev->wireless_handlers->num_private_args == 0) || | |
582 | (dev->wireless_handlers->private_args == NULL)) | |
583 | return -EOPNOTSUPP; | |
584 | ||
585 | /* Check if there is enough buffer up there */ | |
586 | if(wrqu->data.length < dev->wireless_handlers->num_private_args) { | |
587 | /* User space can't know in advance how large the buffer | |
588 | * needs to be. Give it a hint, so that we can support | |
589 | * any size buffer we want somewhat efficiently... */ | |
590 | wrqu->data.length = dev->wireless_handlers->num_private_args; | |
591 | return -E2BIG; | |
592 | } | |
593 | ||
594 | /* Set the number of available ioctls. */ | |
595 | wrqu->data.length = dev->wireless_handlers->num_private_args; | |
596 | ||
597 | /* Copy structure to the user buffer. */ | |
598 | memcpy(extra, dev->wireless_handlers->private_args, | |
599 | sizeof(struct iw_priv_args) * wrqu->data.length); | |
600 | ||
601 | return 0; | |
602 | } | |
603 | ||
1da177e4 LT |
604 | |
605 | /******************** /proc/net/wireless SUPPORT ********************/ | |
606 | /* | |
607 | * The /proc/net/wireless file is a human readable user-space interface | |
608 | * exporting various wireless specific statistics from the wireless devices. | |
609 | * This is the most popular part of the Wireless Extensions ;-) | |
610 | * | |
611 | * This interface is a pure clone of /proc/net/dev (in net/core/dev.c). | |
612 | * The content of the file is basically the content of "struct iw_statistics". | |
613 | */ | |
614 | ||
615 | #ifdef CONFIG_PROC_FS | |
616 | ||
617 | /* ---------------------------------------------------------------- */ | |
618 | /* | |
619 | * Print one entry (line) of /proc/net/wireless | |
620 | */ | |
621 | static __inline__ void wireless_seq_printf_stats(struct seq_file *seq, | |
622 | struct net_device *dev) | |
623 | { | |
624 | /* Get stats from the driver */ | |
625 | struct iw_statistics *stats = get_wireless_stats(dev); | |
626 | ||
627 | if (stats) { | |
628 | seq_printf(seq, "%6s: %04x %3d%c %3d%c %3d%c %6d %6d %6d " | |
629 | "%6d %6d %6d\n", | |
630 | dev->name, stats->status, stats->qual.qual, | |
631 | stats->qual.updated & IW_QUAL_QUAL_UPDATED | |
632 | ? '.' : ' ', | |
6582c164 JT |
633 | ((__s32) stats->qual.level) - |
634 | ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0), | |
1da177e4 LT |
635 | stats->qual.updated & IW_QUAL_LEVEL_UPDATED |
636 | ? '.' : ' ', | |
6582c164 JT |
637 | ((__s32) stats->qual.noise) - |
638 | ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0), | |
1da177e4 LT |
639 | stats->qual.updated & IW_QUAL_NOISE_UPDATED |
640 | ? '.' : ' ', | |
641 | stats->discard.nwid, stats->discard.code, | |
642 | stats->discard.fragment, stats->discard.retries, | |
643 | stats->discard.misc, stats->miss.beacon); | |
6582c164 | 644 | stats->qual.updated &= ~IW_QUAL_ALL_UPDATED; |
1da177e4 LT |
645 | } |
646 | } | |
647 | ||
648 | /* ---------------------------------------------------------------- */ | |
649 | /* | |
650 | * Print info for /proc/net/wireless (print all entries) | |
651 | */ | |
652 | static int wireless_seq_show(struct seq_file *seq, void *v) | |
653 | { | |
654 | if (v == SEQ_START_TOKEN) | |
655 | seq_printf(seq, "Inter-| sta-| Quality | Discarded " | |
656 | "packets | Missed | WE\n" | |
657 | " face | tus | link level noise | nwid " | |
658 | "crypt frag retry misc | beacon | %d\n", | |
659 | WIRELESS_EXT); | |
660 | else | |
661 | wireless_seq_printf_stats(seq, v); | |
662 | return 0; | |
663 | } | |
664 | ||
1da177e4 LT |
665 | static struct seq_operations wireless_seq_ops = { |
666 | .start = dev_seq_start, | |
667 | .next = dev_seq_next, | |
668 | .stop = dev_seq_stop, | |
669 | .show = wireless_seq_show, | |
670 | }; | |
671 | ||
672 | static int wireless_seq_open(struct inode *inode, struct file *file) | |
673 | { | |
674 | return seq_open(file, &wireless_seq_ops); | |
675 | } | |
676 | ||
677 | static struct file_operations wireless_seq_fops = { | |
678 | .owner = THIS_MODULE, | |
679 | .open = wireless_seq_open, | |
680 | .read = seq_read, | |
681 | .llseek = seq_lseek, | |
682 | .release = seq_release, | |
683 | }; | |
684 | ||
685 | int __init wireless_proc_init(void) | |
686 | { | |
6582c164 | 687 | /* Create /proc/net/wireless entry */ |
1da177e4 LT |
688 | if (!proc_net_fops_create("wireless", S_IRUGO, &wireless_seq_fops)) |
689 | return -ENOMEM; | |
690 | ||
691 | return 0; | |
692 | } | |
693 | #endif /* CONFIG_PROC_FS */ | |
694 | ||
695 | /************************** IOCTL SUPPORT **************************/ | |
696 | /* | |
697 | * The original user space API to configure all those Wireless Extensions | |
698 | * is through IOCTLs. | |
699 | * In there, we check if we need to call the new driver API (iw_handler) | |
700 | * or just call the driver ioctl handler. | |
701 | */ | |
702 | ||
1da177e4 LT |
703 | /* ---------------------------------------------------------------- */ |
704 | /* | |
705 | * Wrapper to call a standard Wireless Extension handler. | |
706 | * We do various checks and also take care of moving data between | |
707 | * user space and kernel space. | |
708 | */ | |
711e2c33 JT |
709 | static int ioctl_standard_call(struct net_device * dev, |
710 | struct ifreq * ifr, | |
711 | unsigned int cmd, | |
712 | iw_handler handler) | |
1da177e4 LT |
713 | { |
714 | struct iwreq * iwr = (struct iwreq *) ifr; | |
715 | const struct iw_ioctl_description * descr; | |
716 | struct iw_request_info info; | |
717 | int ret = -EINVAL; | |
718 | ||
719 | /* Get the description of the IOCTL */ | |
720 | if((cmd - SIOCIWFIRST) >= standard_ioctl_num) | |
721 | return -EOPNOTSUPP; | |
722 | descr = &(standard_ioctl[cmd - SIOCIWFIRST]); | |
723 | ||
724 | #ifdef WE_IOCTL_DEBUG | |
725 | printk(KERN_DEBUG "%s (WE) : Found standard handler for 0x%04X\n", | |
726 | ifr->ifr_name, cmd); | |
727 | printk(KERN_DEBUG "%s (WE) : Header type : %d, Token type : %d, size : %d, token : %d\n", dev->name, descr->header_type, descr->token_type, descr->token_size, descr->max_tokens); | |
728 | #endif /* WE_IOCTL_DEBUG */ | |
729 | ||
730 | /* Prepare the call */ | |
731 | info.cmd = cmd; | |
732 | info.flags = 0; | |
733 | ||
734 | /* Check if we have a pointer to user space data or not */ | |
735 | if(descr->header_type != IW_HEADER_TYPE_POINT) { | |
736 | ||
737 | /* No extra arguments. Trivial to handle */ | |
738 | ret = handler(dev, &info, &(iwr->u), NULL); | |
739 | ||
740 | #ifdef WE_SET_EVENT | |
741 | /* Generate an event to notify listeners of the change */ | |
742 | if((descr->flags & IW_DESCR_FLAG_EVENT) && | |
743 | ((ret == 0) || (ret == -EIWCOMMIT))) | |
744 | wireless_send_event(dev, cmd, &(iwr->u), NULL); | |
745 | #endif /* WE_SET_EVENT */ | |
746 | } else { | |
747 | char * extra; | |
748 | int extra_size; | |
749 | int user_length = 0; | |
750 | int err; | |
751 | ||
752 | /* Calculate space needed by arguments. Always allocate | |
753 | * for max space. Easier, and won't last long... */ | |
754 | extra_size = descr->max_tokens * descr->token_size; | |
755 | ||
756 | /* Check what user space is giving us */ | |
757 | if(IW_IS_SET(cmd)) { | |
758 | /* Check NULL pointer */ | |
759 | if((iwr->u.data.pointer == NULL) && | |
760 | (iwr->u.data.length != 0)) | |
761 | return -EFAULT; | |
762 | /* Check if number of token fits within bounds */ | |
763 | if(iwr->u.data.length > descr->max_tokens) | |
764 | return -E2BIG; | |
765 | if(iwr->u.data.length < descr->min_tokens) | |
766 | return -EINVAL; | |
767 | } else { | |
768 | /* Check NULL pointer */ | |
769 | if(iwr->u.data.pointer == NULL) | |
770 | return -EFAULT; | |
771 | /* Save user space buffer size for checking */ | |
772 | user_length = iwr->u.data.length; | |
773 | ||
774 | /* Don't check if user_length > max to allow forward | |
775 | * compatibility. The test user_length < min is | |
776 | * implied by the test at the end. */ | |
777 | ||
778 | /* Support for very large requests */ | |
779 | if((descr->flags & IW_DESCR_FLAG_NOMAX) && | |
780 | (user_length > descr->max_tokens)) { | |
781 | /* Allow userspace to GET more than max so | |
782 | * we can support any size GET requests. | |
783 | * There is still a limit : -ENOMEM. */ | |
784 | extra_size = user_length * descr->token_size; | |
785 | /* Note : user_length is originally a __u16, | |
786 | * and token_size is controlled by us, | |
787 | * so extra_size won't get negative and | |
788 | * won't overflow... */ | |
789 | } | |
790 | } | |
791 | ||
792 | #ifdef WE_IOCTL_DEBUG | |
793 | printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n", | |
794 | dev->name, extra_size); | |
795 | #endif /* WE_IOCTL_DEBUG */ | |
796 | ||
797 | /* Create the kernel buffer */ | |
798 | extra = kmalloc(extra_size, GFP_KERNEL); | |
799 | if (extra == NULL) { | |
800 | return -ENOMEM; | |
801 | } | |
802 | ||
803 | /* If it is a SET, get all the extra data in here */ | |
804 | if(IW_IS_SET(cmd) && (iwr->u.data.length != 0)) { | |
805 | err = copy_from_user(extra, iwr->u.data.pointer, | |
806 | iwr->u.data.length * | |
807 | descr->token_size); | |
808 | if (err) { | |
809 | kfree(extra); | |
810 | return -EFAULT; | |
811 | } | |
812 | #ifdef WE_IOCTL_DEBUG | |
813 | printk(KERN_DEBUG "%s (WE) : Got %d bytes\n", | |
814 | dev->name, | |
815 | iwr->u.data.length * descr->token_size); | |
816 | #endif /* WE_IOCTL_DEBUG */ | |
817 | } | |
818 | ||
819 | /* Call the handler */ | |
820 | ret = handler(dev, &info, &(iwr->u), extra); | |
821 | ||
822 | /* If we have something to return to the user */ | |
823 | if (!ret && IW_IS_GET(cmd)) { | |
824 | /* Check if there is enough buffer up there */ | |
825 | if(user_length < iwr->u.data.length) { | |
826 | kfree(extra); | |
827 | return -E2BIG; | |
828 | } | |
829 | ||
830 | err = copy_to_user(iwr->u.data.pointer, extra, | |
831 | iwr->u.data.length * | |
832 | descr->token_size); | |
833 | if (err) | |
834 | ret = -EFAULT; | |
835 | #ifdef WE_IOCTL_DEBUG | |
836 | printk(KERN_DEBUG "%s (WE) : Wrote %d bytes\n", | |
837 | dev->name, | |
838 | iwr->u.data.length * descr->token_size); | |
839 | #endif /* WE_IOCTL_DEBUG */ | |
840 | } | |
841 | ||
842 | #ifdef WE_SET_EVENT | |
843 | /* Generate an event to notify listeners of the change */ | |
844 | if((descr->flags & IW_DESCR_FLAG_EVENT) && | |
845 | ((ret == 0) || (ret == -EIWCOMMIT))) { | |
846 | if(descr->flags & IW_DESCR_FLAG_RESTRICT) | |
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 | } | |
854 | #endif /* WE_SET_EVENT */ | |
855 | ||
856 | /* Cleanup - I told you it wasn't that long ;-) */ | |
857 | kfree(extra); | |
858 | } | |
859 | ||
860 | /* Call commit handler if needed and defined */ | |
861 | if(ret == -EIWCOMMIT) | |
862 | ret = call_commit_handler(dev); | |
863 | ||
864 | /* Here, we will generate the appropriate event if needed */ | |
865 | ||
866 | return ret; | |
867 | } | |
868 | ||
869 | /* ---------------------------------------------------------------- */ | |
870 | /* | |
871 | * Wrapper to call a private Wireless Extension handler. | |
872 | * We do various checks and also take care of moving data between | |
873 | * user space and kernel space. | |
874 | * It's not as nice and slimline as the standard wrapper. The cause | |
875 | * is struct iw_priv_args, which was not really designed for the | |
876 | * job we are going here. | |
877 | * | |
878 | * IMPORTANT : This function prevent to set and get data on the same | |
879 | * IOCTL and enforce the SET/GET convention. Not doing it would be | |
880 | * far too hairy... | |
881 | * If you need to set and get data at the same time, please don't use | |
882 | * a iw_handler but process it in your ioctl handler (i.e. use the | |
883 | * old driver API). | |
884 | */ | |
885 | static inline int ioctl_private_call(struct net_device * dev, | |
886 | struct ifreq * ifr, | |
887 | unsigned int cmd, | |
888 | iw_handler handler) | |
889 | { | |
890 | struct iwreq * iwr = (struct iwreq *) ifr; | |
891 | const struct iw_priv_args * descr = NULL; | |
892 | struct iw_request_info info; | |
893 | int extra_size = 0; | |
894 | int i; | |
895 | int ret = -EINVAL; | |
896 | ||
897 | /* Get the description of the IOCTL */ | |
898 | for(i = 0; i < dev->wireless_handlers->num_private_args; i++) | |
899 | if(cmd == dev->wireless_handlers->private_args[i].cmd) { | |
900 | descr = &(dev->wireless_handlers->private_args[i]); | |
901 | break; | |
902 | } | |
903 | ||
904 | #ifdef WE_IOCTL_DEBUG | |
905 | printk(KERN_DEBUG "%s (WE) : Found private handler for 0x%04X\n", | |
906 | ifr->ifr_name, cmd); | |
907 | if(descr) { | |
908 | printk(KERN_DEBUG "%s (WE) : Name %s, set %X, get %X\n", | |
909 | dev->name, descr->name, | |
910 | descr->set_args, descr->get_args); | |
911 | } | |
912 | #endif /* WE_IOCTL_DEBUG */ | |
913 | ||
914 | /* Compute the size of the set/get arguments */ | |
915 | if(descr != NULL) { | |
916 | if(IW_IS_SET(cmd)) { | |
917 | int offset = 0; /* For sub-ioctls */ | |
918 | /* Check for sub-ioctl handler */ | |
919 | if(descr->name[0] == '\0') | |
920 | /* Reserve one int for sub-ioctl index */ | |
921 | offset = sizeof(__u32); | |
922 | ||
923 | /* Size of set arguments */ | |
924 | extra_size = get_priv_size(descr->set_args); | |
925 | ||
926 | /* Does it fits in iwr ? */ | |
927 | if((descr->set_args & IW_PRIV_SIZE_FIXED) && | |
928 | ((extra_size + offset) <= IFNAMSIZ)) | |
929 | extra_size = 0; | |
930 | } else { | |
931 | /* Size of get arguments */ | |
932 | extra_size = get_priv_size(descr->get_args); | |
933 | ||
934 | /* Does it fits in iwr ? */ | |
935 | if((descr->get_args & IW_PRIV_SIZE_FIXED) && | |
936 | (extra_size <= IFNAMSIZ)) | |
937 | extra_size = 0; | |
938 | } | |
939 | } | |
940 | ||
941 | /* Prepare the call */ | |
942 | info.cmd = cmd; | |
943 | info.flags = 0; | |
944 | ||
945 | /* Check if we have a pointer to user space data or not. */ | |
946 | if(extra_size == 0) { | |
947 | /* No extra arguments. Trivial to handle */ | |
948 | ret = handler(dev, &info, &(iwr->u), (char *) &(iwr->u)); | |
949 | } else { | |
950 | char * extra; | |
951 | int err; | |
952 | ||
953 | /* Check what user space is giving us */ | |
954 | if(IW_IS_SET(cmd)) { | |
955 | /* Check NULL pointer */ | |
956 | if((iwr->u.data.pointer == NULL) && | |
957 | (iwr->u.data.length != 0)) | |
958 | return -EFAULT; | |
959 | ||
960 | /* Does it fits within bounds ? */ | |
961 | if(iwr->u.data.length > (descr->set_args & | |
962 | IW_PRIV_SIZE_MASK)) | |
963 | return -E2BIG; | |
964 | } else { | |
965 | /* Check NULL pointer */ | |
966 | if(iwr->u.data.pointer == NULL) | |
967 | return -EFAULT; | |
968 | } | |
969 | ||
970 | #ifdef WE_IOCTL_DEBUG | |
971 | printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n", | |
972 | dev->name, extra_size); | |
973 | #endif /* WE_IOCTL_DEBUG */ | |
974 | ||
975 | /* Always allocate for max space. Easier, and won't last | |
976 | * long... */ | |
977 | extra = kmalloc(extra_size, GFP_KERNEL); | |
978 | if (extra == NULL) { | |
979 | return -ENOMEM; | |
980 | } | |
981 | ||
982 | /* If it is a SET, get all the extra data in here */ | |
983 | if(IW_IS_SET(cmd) && (iwr->u.data.length != 0)) { | |
984 | err = copy_from_user(extra, iwr->u.data.pointer, | |
985 | extra_size); | |
986 | if (err) { | |
987 | kfree(extra); | |
988 | return -EFAULT; | |
989 | } | |
990 | #ifdef WE_IOCTL_DEBUG | |
991 | printk(KERN_DEBUG "%s (WE) : Got %d elem\n", | |
992 | dev->name, iwr->u.data.length); | |
993 | #endif /* WE_IOCTL_DEBUG */ | |
994 | } | |
995 | ||
996 | /* Call the handler */ | |
997 | ret = handler(dev, &info, &(iwr->u), extra); | |
998 | ||
999 | /* If we have something to return to the user */ | |
1000 | if (!ret && IW_IS_GET(cmd)) { | |
1001 | ||
1002 | /* Adjust for the actual length if it's variable, | |
1003 | * avoid leaking kernel bits outside. */ | |
1004 | if (!(descr->get_args & IW_PRIV_SIZE_FIXED)) { | |
1005 | extra_size = adjust_priv_size(descr->get_args, | |
1006 | &(iwr->u)); | |
1007 | } | |
1008 | ||
1009 | err = copy_to_user(iwr->u.data.pointer, extra, | |
1010 | extra_size); | |
1011 | if (err) | |
1012 | ret = -EFAULT; | |
1013 | #ifdef WE_IOCTL_DEBUG | |
1014 | printk(KERN_DEBUG "%s (WE) : Wrote %d elem\n", | |
1015 | dev->name, iwr->u.data.length); | |
1016 | #endif /* WE_IOCTL_DEBUG */ | |
1017 | } | |
1018 | ||
1019 | /* Cleanup - I told you it wasn't that long ;-) */ | |
1020 | kfree(extra); | |
1021 | } | |
1022 | ||
1023 | ||
1024 | /* Call commit handler if needed and defined */ | |
1025 | if(ret == -EIWCOMMIT) | |
1026 | ret = call_commit_handler(dev); | |
1027 | ||
1028 | return ret; | |
1029 | } | |
1030 | ||
1031 | /* ---------------------------------------------------------------- */ | |
1032 | /* | |
1033 | * Main IOCTl dispatcher. Called from the main networking code | |
1034 | * (dev_ioctl() in net/core/dev.c). | |
1035 | * Check the type of IOCTL and call the appropriate wrapper... | |
1036 | */ | |
1037 | int wireless_process_ioctl(struct ifreq *ifr, unsigned int cmd) | |
1038 | { | |
1039 | struct net_device *dev; | |
1040 | iw_handler handler; | |
1041 | ||
1042 | /* Permissions are already checked in dev_ioctl() before calling us. | |
1043 | * The copy_to/from_user() of ifr is also dealt with in there */ | |
1044 | ||
1045 | /* Make sure the device exist */ | |
1046 | if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL) | |
1047 | return -ENODEV; | |
1048 | ||
1049 | /* A bunch of special cases, then the generic case... | |
1050 | * Note that 'cmd' is already filtered in dev_ioctl() with | |
1051 | * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */ | |
1052 | switch(cmd) | |
1053 | { | |
1054 | case SIOCGIWSTATS: | |
1055 | /* Get Wireless Stats */ | |
711e2c33 JT |
1056 | return ioctl_standard_call(dev, |
1057 | ifr, | |
1058 | cmd, | |
1059 | &iw_handler_get_iwstats); | |
1da177e4 LT |
1060 | |
1061 | case SIOCGIWPRIV: | |
1062 | /* Check if we have some wireless handlers defined */ | |
1063 | if(dev->wireless_handlers != NULL) { | |
1064 | /* We export to user space the definition of | |
1065 | * the private handler ourselves */ | |
711e2c33 JT |
1066 | return ioctl_standard_call(dev, |
1067 | ifr, | |
1068 | cmd, | |
1069 | &iw_handler_get_private); | |
1da177e4 LT |
1070 | } |
1071 | // ## Fall-through for old API ## | |
1072 | default: | |
1073 | /* Generic IOCTL */ | |
1074 | /* Basic check */ | |
1075 | if (!netif_device_present(dev)) | |
1076 | return -ENODEV; | |
1077 | /* New driver API : try to find the handler */ | |
1078 | handler = get_handler(dev, cmd); | |
1079 | if(handler != NULL) { | |
1080 | /* Standard and private are not the same */ | |
1081 | if(cmd < SIOCIWFIRSTPRIV) | |
1082 | return ioctl_standard_call(dev, | |
1083 | ifr, | |
1084 | cmd, | |
1085 | handler); | |
1086 | else | |
1087 | return ioctl_private_call(dev, | |
1088 | ifr, | |
1089 | cmd, | |
1090 | handler); | |
1091 | } | |
1092 | /* Old driver API : call driver ioctl handler */ | |
1093 | if (dev->do_ioctl) { | |
1094 | return dev->do_ioctl(dev, ifr, cmd); | |
1095 | } | |
1096 | return -EOPNOTSUPP; | |
1097 | } | |
1098 | /* Not reached */ | |
1099 | return -EINVAL; | |
1100 | } | |
1101 | ||
711e2c33 JT |
1102 | /********************** RTNETLINK REQUEST API **********************/ |
1103 | /* | |
1104 | * The alternate user space API to configure all those Wireless Extensions | |
1105 | * is through RtNetlink. | |
1106 | * This API support only the new driver API (iw_handler). | |
1107 | * | |
1108 | * This RtNetlink API use the same query/reply model as the ioctl API. | |
1109 | * Maximum effort has been done to fit in the RtNetlink model, and | |
1110 | * we support both RtNetlink Set and RtNelink Get operations. | |
1111 | * On the other hand, we don't offer Dump operations because of the | |
1112 | * following reasons : | |
1113 | * o Large number of parameters, most optional | |
1114 | * o Large size of some parameters (> 100 bytes) | |
1115 | * o Each parameters need to be extracted from hardware | |
1116 | * o Scan requests can take seconds and disable network activity. | |
1117 | * Because of this high cost/overhead, we want to return only the | |
1118 | * parameters the user application is really interested in. | |
1119 | * We could offer partial Dump using the IW_DESCR_FLAG_DUMP flag. | |
1120 | * | |
1121 | * The API uses the standard RtNetlink socket. When the RtNetlink code | |
1122 | * find a IFLA_WIRELESS field in a RtNetlink SET_LINK request, | |
1123 | * it calls here. | |
1124 | */ | |
1125 | ||
1126 | #ifdef CONFIG_NET_WIRELESS_RTNETLINK | |
1127 | /* ---------------------------------------------------------------- */ | |
1128 | /* | |
1129 | * Wrapper to call a standard Wireless Extension GET handler. | |
1130 | * We do various checks and call the handler with the proper args. | |
1131 | */ | |
1132 | static int rtnetlink_standard_get(struct net_device * dev, | |
1133 | struct iw_event * request, | |
1134 | int request_len, | |
1135 | iw_handler handler, | |
1136 | char ** p_buf, | |
1137 | int * p_len) | |
1138 | { | |
1139 | const struct iw_ioctl_description * descr = NULL; | |
1140 | unsigned int cmd; | |
1141 | union iwreq_data * wrqu; | |
1142 | int hdr_len; | |
1143 | struct iw_request_info info; | |
1144 | char * buffer = NULL; | |
1145 | int buffer_size = 0; | |
1146 | int ret = -EINVAL; | |
1147 | ||
1148 | /* Get the description of the Request */ | |
1149 | cmd = request->cmd; | |
1150 | if((cmd - SIOCIWFIRST) >= standard_ioctl_num) | |
1151 | return -EOPNOTSUPP; | |
1152 | descr = &(standard_ioctl[cmd - SIOCIWFIRST]); | |
1153 | ||
1154 | #ifdef WE_RTNETLINK_DEBUG | |
1155 | printk(KERN_DEBUG "%s (WE.r) : Found standard handler for 0x%04X\n", | |
1156 | dev->name, cmd); | |
1157 | printk(KERN_DEBUG "%s (WE.r) : Header type : %d, Token type : %d, size : %d, token : %d\n", dev->name, descr->header_type, descr->token_type, descr->token_size, descr->max_tokens); | |
1158 | #endif /* WE_RTNETLINK_DEBUG */ | |
1159 | ||
1160 | /* Check if wrqu is complete */ | |
1161 | hdr_len = event_type_size[descr->header_type]; | |
1162 | if(request_len < hdr_len) { | |
1163 | #ifdef WE_RTNETLINK_DEBUG | |
1164 | printk(KERN_DEBUG | |
1165 | "%s (WE.r) : Wireless request too short (%d)\n", | |
1166 | dev->name, request_len); | |
1167 | #endif /* WE_RTNETLINK_DEBUG */ | |
1168 | return -EINVAL; | |
1169 | } | |
1170 | ||
1171 | /* Prepare the call */ | |
1172 | info.cmd = cmd; | |
1173 | info.flags = 0; | |
1174 | ||
1175 | /* Check if we have extra data in the reply or not */ | |
1176 | if(descr->header_type != IW_HEADER_TYPE_POINT) { | |
1177 | ||
1178 | /* Create the kernel buffer that we will return. | |
1179 | * It's at an offset to match the TYPE_POINT case... */ | |
1180 | buffer_size = request_len + IW_EV_POINT_OFF; | |
1181 | buffer = kmalloc(buffer_size, GFP_KERNEL); | |
1182 | if (buffer == NULL) { | |
1183 | return -ENOMEM; | |
1184 | } | |
1185 | /* Copy event data */ | |
1186 | memcpy(buffer + IW_EV_POINT_OFF, request, request_len); | |
1187 | /* Use our own copy of wrqu */ | |
1188 | wrqu = (union iwreq_data *) (buffer + IW_EV_POINT_OFF | |
1189 | + IW_EV_LCP_LEN); | |
1190 | ||
1191 | /* No extra arguments. Trivial to handle */ | |
1192 | ret = handler(dev, &info, wrqu, NULL); | |
1193 | ||
1194 | } else { | |
1195 | union iwreq_data wrqu_point; | |
1196 | char * extra = NULL; | |
1197 | int extra_size = 0; | |
1198 | ||
1199 | /* Get a temp copy of wrqu (skip pointer) */ | |
1200 | memcpy(((char *) &wrqu_point) + IW_EV_POINT_OFF, | |
1201 | ((char *) request) + IW_EV_LCP_LEN, | |
1202 | IW_EV_POINT_LEN - IW_EV_LCP_LEN); | |
1203 | ||
1204 | /* Calculate space needed by arguments. Always allocate | |
1205 | * for max space. Easier, and won't last long... */ | |
1206 | extra_size = descr->max_tokens * descr->token_size; | |
1207 | /* Support for very large requests */ | |
1208 | if((descr->flags & IW_DESCR_FLAG_NOMAX) && | |
1209 | (wrqu_point.data.length > descr->max_tokens)) | |
1210 | extra_size = (wrqu_point.data.length | |
1211 | * descr->token_size); | |
1212 | buffer_size = extra_size + IW_EV_POINT_LEN + IW_EV_POINT_OFF; | |
1213 | #ifdef WE_RTNETLINK_DEBUG | |
1214 | printk(KERN_DEBUG "%s (WE.r) : Malloc %d bytes (%d bytes)\n", | |
1215 | dev->name, extra_size, buffer_size); | |
1216 | #endif /* WE_RTNETLINK_DEBUG */ | |
1217 | ||
1218 | /* Create the kernel buffer that we will return */ | |
1219 | buffer = kmalloc(buffer_size, GFP_KERNEL); | |
1220 | if (buffer == NULL) { | |
1221 | return -ENOMEM; | |
1222 | } | |
1223 | ||
1224 | /* Put wrqu in the right place (just before extra). | |
1225 | * Leave space for IWE header and dummy pointer... | |
1226 | * Note that IW_EV_LCP_LEN==4 bytes, so it's still aligned... | |
1227 | */ | |
1228 | memcpy(buffer + IW_EV_LCP_LEN + IW_EV_POINT_OFF, | |
1229 | ((char *) &wrqu_point) + IW_EV_POINT_OFF, | |
1230 | IW_EV_POINT_LEN - IW_EV_LCP_LEN); | |
1231 | wrqu = (union iwreq_data *) (buffer + IW_EV_LCP_LEN); | |
1232 | ||
1233 | /* Extra comes logically after that. Offset +12 bytes. */ | |
1234 | extra = buffer + IW_EV_POINT_OFF + IW_EV_POINT_LEN; | |
1235 | ||
1236 | /* Call the handler */ | |
1237 | ret = handler(dev, &info, wrqu, extra); | |
1238 | ||
1239 | /* Calculate real returned length */ | |
1240 | extra_size = (wrqu->data.length * descr->token_size); | |
1241 | /* Re-adjust reply size */ | |
1242 | request->len = extra_size + IW_EV_POINT_LEN; | |
1243 | ||
1244 | /* Put the iwe header where it should, i.e. scrap the | |
1245 | * dummy pointer. */ | |
1246 | memcpy(buffer + IW_EV_POINT_OFF, request, IW_EV_LCP_LEN); | |
1247 | ||
1248 | #ifdef WE_RTNETLINK_DEBUG | |
1249 | printk(KERN_DEBUG "%s (WE.r) : Reply 0x%04X, hdr_len %d, tokens %d, extra_size %d, buffer_size %d\n", dev->name, cmd, hdr_len, wrqu->data.length, extra_size, buffer_size); | |
1250 | #endif /* WE_RTNETLINK_DEBUG */ | |
1251 | ||
1252 | /* Check if there is enough buffer up there */ | |
1253 | if(wrqu_point.data.length < wrqu->data.length) | |
1254 | ret = -E2BIG; | |
1255 | } | |
1256 | ||
1257 | /* Return the buffer to the caller */ | |
1258 | if (!ret) { | |
1259 | *p_buf = buffer; | |
1260 | *p_len = request->len; | |
1261 | } else { | |
1262 | /* Cleanup */ | |
1263 | if(buffer) | |
1264 | kfree(buffer); | |
1265 | } | |
1266 | ||
1267 | return ret; | |
1268 | } | |
1269 | ||
1270 | /* ---------------------------------------------------------------- */ | |
1271 | /* | |
1272 | * Wrapper to call a standard Wireless Extension SET handler. | |
1273 | * We do various checks and call the handler with the proper args. | |
1274 | */ | |
1275 | static inline int rtnetlink_standard_set(struct net_device * dev, | |
1276 | struct iw_event * request, | |
1277 | int request_len, | |
1278 | iw_handler handler) | |
1279 | { | |
1280 | const struct iw_ioctl_description * descr = NULL; | |
1281 | unsigned int cmd; | |
1282 | union iwreq_data * wrqu; | |
1283 | union iwreq_data wrqu_point; | |
1284 | int hdr_len; | |
1285 | char * extra = NULL; | |
1286 | int extra_size = 0; | |
1287 | struct iw_request_info info; | |
1288 | int ret = -EINVAL; | |
1289 | ||
1290 | /* Get the description of the Request */ | |
1291 | cmd = request->cmd; | |
1292 | if((cmd - SIOCIWFIRST) >= standard_ioctl_num) | |
1293 | return -EOPNOTSUPP; | |
1294 | descr = &(standard_ioctl[cmd - SIOCIWFIRST]); | |
1295 | ||
1296 | #ifdef WE_RTNETLINK_DEBUG | |
1297 | printk(KERN_DEBUG "%s (WE.r) : Found standard SET handler for 0x%04X\n", | |
1298 | dev->name, cmd); | |
1299 | printk(KERN_DEBUG "%s (WE.r) : Header type : %d, Token type : %d, size : %d, token : %d\n", dev->name, descr->header_type, descr->token_type, descr->token_size, descr->max_tokens); | |
1300 | #endif /* WE_RTNETLINK_DEBUG */ | |
1301 | ||
1302 | /* Extract fixed header from request. This is properly aligned. */ | |
1303 | wrqu = &request->u; | |
1304 | ||
1305 | /* Check if wrqu is complete */ | |
1306 | hdr_len = event_type_size[descr->header_type]; | |
1307 | if(request_len < hdr_len) { | |
1308 | #ifdef WE_RTNETLINK_DEBUG | |
1309 | printk(KERN_DEBUG | |
1310 | "%s (WE.r) : Wireless request too short (%d)\n", | |
1311 | dev->name, request_len); | |
1312 | #endif /* WE_RTNETLINK_DEBUG */ | |
1313 | return -EINVAL; | |
1314 | } | |
1315 | ||
1316 | /* Prepare the call */ | |
1317 | info.cmd = cmd; | |
1318 | info.flags = 0; | |
1319 | ||
1320 | /* Check if we have extra data in the request or not */ | |
1321 | if(descr->header_type != IW_HEADER_TYPE_POINT) { | |
1322 | ||
1323 | /* No extra arguments. Trivial to handle */ | |
1324 | ret = handler(dev, &info, wrqu, NULL); | |
1325 | ||
1326 | } else { | |
1327 | int extra_len; | |
1328 | ||
1329 | /* Put wrqu in the right place (skip pointer) */ | |
1330 | memcpy(((char *) &wrqu_point) + IW_EV_POINT_OFF, | |
1331 | wrqu, IW_EV_POINT_LEN - IW_EV_LCP_LEN); | |
1332 | /* Don't forget about the event code... */ | |
1333 | wrqu = &wrqu_point; | |
1334 | ||
1335 | /* Check if number of token fits within bounds */ | |
1336 | if(wrqu_point.data.length > descr->max_tokens) | |
1337 | return -E2BIG; | |
1338 | if(wrqu_point.data.length < descr->min_tokens) | |
1339 | return -EINVAL; | |
1340 | ||
1341 | /* Real length of payload */ | |
1342 | extra_len = wrqu_point.data.length * descr->token_size; | |
1343 | ||
1344 | /* Check if request is self consistent */ | |
1345 | if((request_len - hdr_len) < extra_len) { | |
1346 | #ifdef WE_RTNETLINK_DEBUG | |
1347 | printk(KERN_DEBUG "%s (WE.r) : Wireless request data too short (%d)\n", | |
1348 | dev->name, extra_size); | |
1349 | #endif /* WE_RTNETLINK_DEBUG */ | |
1350 | return -EINVAL; | |
1351 | } | |
1352 | ||
1353 | #ifdef WE_RTNETLINK_DEBUG | |
1354 | printk(KERN_DEBUG "%s (WE.r) : Malloc %d bytes\n", | |
1355 | dev->name, extra_size); | |
1356 | #endif /* WE_RTNETLINK_DEBUG */ | |
1357 | ||
1358 | /* Always allocate for max space. Easier, and won't last | |
1359 | * long... */ | |
1360 | extra_size = descr->max_tokens * descr->token_size; | |
1361 | extra = kmalloc(extra_size, GFP_KERNEL); | |
1362 | if (extra == NULL) | |
1363 | return -ENOMEM; | |
1364 | ||
1365 | /* Copy extra in aligned buffer */ | |
1366 | memcpy(extra, ((char *) request) + hdr_len, extra_len); | |
1367 | ||
1368 | /* Call the handler */ | |
1369 | ret = handler(dev, &info, &wrqu_point, extra); | |
1370 | } | |
1371 | ||
1372 | #ifdef WE_SET_EVENT | |
1373 | /* Generate an event to notify listeners of the change */ | |
1374 | if((descr->flags & IW_DESCR_FLAG_EVENT) && | |
1375 | ((ret == 0) || (ret == -EIWCOMMIT))) { | |
1376 | if(descr->flags & IW_DESCR_FLAG_RESTRICT) | |
1377 | /* If the event is restricted, don't | |
1378 | * export the payload */ | |
1379 | wireless_send_event(dev, cmd, wrqu, NULL); | |
1380 | else | |
1381 | wireless_send_event(dev, cmd, wrqu, extra); | |
1382 | } | |
1383 | #endif /* WE_SET_EVENT */ | |
1384 | ||
1385 | /* Cleanup - I told you it wasn't that long ;-) */ | |
1386 | if(extra) | |
1387 | kfree(extra); | |
1388 | ||
1389 | /* Call commit handler if needed and defined */ | |
1390 | if(ret == -EIWCOMMIT) | |
1391 | ret = call_commit_handler(dev); | |
1392 | ||
1393 | return ret; | |
1394 | } | |
1395 | ||
1396 | /* ---------------------------------------------------------------- */ | |
1397 | /* | |
1398 | * Wrapper to call a private Wireless Extension GET handler. | |
1399 | * Same as above... | |
1400 | * It's not as nice and slimline as the standard wrapper. The cause | |
1401 | * is struct iw_priv_args, which was not really designed for the | |
1402 | * job we are going here. | |
1403 | * | |
1404 | * IMPORTANT : This function prevent to set and get data on the same | |
1405 | * IOCTL and enforce the SET/GET convention. Not doing it would be | |
1406 | * far too hairy... | |
1407 | * If you need to set and get data at the same time, please don't use | |
1408 | * a iw_handler but process it in your ioctl handler (i.e. use the | |
1409 | * old driver API). | |
1410 | */ | |
1411 | static inline int rtnetlink_private_get(struct net_device * dev, | |
1412 | struct iw_event * request, | |
1413 | int request_len, | |
1414 | iw_handler handler, | |
1415 | char ** p_buf, | |
1416 | int * p_len) | |
1417 | { | |
1418 | const struct iw_priv_args * descr = NULL; | |
1419 | unsigned int cmd; | |
1420 | union iwreq_data * wrqu; | |
1421 | int hdr_len; | |
1422 | struct iw_request_info info; | |
1423 | int extra_size = 0; | |
1424 | int i; | |
1425 | char * buffer = NULL; | |
1426 | int buffer_size = 0; | |
1427 | int ret = -EINVAL; | |
1428 | ||
1429 | /* Get the description of the Request */ | |
1430 | cmd = request->cmd; | |
1431 | for(i = 0; i < dev->wireless_handlers->num_private_args; i++) | |
1432 | if(cmd == dev->wireless_handlers->private_args[i].cmd) { | |
1433 | descr = &(dev->wireless_handlers->private_args[i]); | |
1434 | break; | |
1435 | } | |
1436 | if(descr == NULL) | |
1437 | return -EOPNOTSUPP; | |
1438 | ||
1439 | #ifdef WE_RTNETLINK_DEBUG | |
1440 | printk(KERN_DEBUG "%s (WE.r) : Found private handler for 0x%04X\n", | |
1441 | dev->name, cmd); | |
1442 | printk(KERN_DEBUG "%s (WE.r) : Name %s, set %X, get %X\n", | |
1443 | dev->name, descr->name, descr->set_args, descr->get_args); | |
1444 | #endif /* WE_RTNETLINK_DEBUG */ | |
1445 | ||
1446 | /* Compute the max size of the get arguments */ | |
1447 | extra_size = get_priv_size(descr->get_args); | |
1448 | ||
1449 | /* Does it fits in wrqu ? */ | |
1450 | if((descr->get_args & IW_PRIV_SIZE_FIXED) && | |
1451 | (extra_size <= IFNAMSIZ)) { | |
1452 | hdr_len = extra_size; | |
1453 | extra_size = 0; | |
1454 | } else { | |
1455 | hdr_len = IW_EV_POINT_LEN; | |
1456 | } | |
1457 | ||
1458 | /* Check if wrqu is complete */ | |
1459 | if(request_len < hdr_len) { | |
1460 | #ifdef WE_RTNETLINK_DEBUG | |
1461 | printk(KERN_DEBUG | |
1462 | "%s (WE.r) : Wireless request too short (%d)\n", | |
1463 | dev->name, request_len); | |
1464 | #endif /* WE_RTNETLINK_DEBUG */ | |
1465 | return -EINVAL; | |
1466 | } | |
1467 | ||
1468 | /* Prepare the call */ | |
1469 | info.cmd = cmd; | |
1470 | info.flags = 0; | |
1471 | ||
1472 | /* Check if we have a pointer to user space data or not. */ | |
1473 | if(extra_size == 0) { | |
1474 | ||
1475 | /* Create the kernel buffer that we will return. | |
1476 | * It's at an offset to match the TYPE_POINT case... */ | |
1477 | buffer_size = request_len + IW_EV_POINT_OFF; | |
1478 | buffer = kmalloc(buffer_size, GFP_KERNEL); | |
1479 | if (buffer == NULL) { | |
1480 | return -ENOMEM; | |
1481 | } | |
1482 | /* Copy event data */ | |
1483 | memcpy(buffer + IW_EV_POINT_OFF, request, request_len); | |
1484 | /* Use our own copy of wrqu */ | |
1485 | wrqu = (union iwreq_data *) (buffer + IW_EV_POINT_OFF | |
1486 | + IW_EV_LCP_LEN); | |
1487 | ||
1488 | /* No extra arguments. Trivial to handle */ | |
1489 | ret = handler(dev, &info, wrqu, (char *) wrqu); | |
1490 | ||
1491 | } else { | |
1492 | char * extra; | |
1493 | ||
1494 | /* Buffer for full reply */ | |
1495 | buffer_size = extra_size + IW_EV_POINT_LEN + IW_EV_POINT_OFF; | |
1496 | ||
1497 | #ifdef WE_RTNETLINK_DEBUG | |
1498 | printk(KERN_DEBUG "%s (WE.r) : Malloc %d bytes (%d bytes)\n", | |
1499 | dev->name, extra_size, buffer_size); | |
1500 | #endif /* WE_RTNETLINK_DEBUG */ | |
1501 | ||
1502 | /* Create the kernel buffer that we will return */ | |
1503 | buffer = kmalloc(buffer_size, GFP_KERNEL); | |
1504 | if (buffer == NULL) { | |
1505 | return -ENOMEM; | |
1506 | } | |
1507 | ||
1508 | /* Put wrqu in the right place (just before extra). | |
1509 | * Leave space for IWE header and dummy pointer... | |
1510 | * Note that IW_EV_LCP_LEN==4 bytes, so it's still aligned... | |
1511 | */ | |
1512 | memcpy(buffer + IW_EV_LCP_LEN + IW_EV_POINT_OFF, | |
1513 | ((char *) request) + IW_EV_LCP_LEN, | |
1514 | IW_EV_POINT_LEN - IW_EV_LCP_LEN); | |
1515 | wrqu = (union iwreq_data *) (buffer + IW_EV_LCP_LEN); | |
1516 | ||
1517 | /* Extra comes logically after that. Offset +12 bytes. */ | |
1518 | extra = buffer + IW_EV_POINT_OFF + IW_EV_POINT_LEN; | |
1519 | ||
1520 | /* Call the handler */ | |
1521 | ret = handler(dev, &info, wrqu, extra); | |
1522 | ||
1523 | /* Adjust for the actual length if it's variable, | |
1524 | * avoid leaking kernel bits outside. */ | |
1525 | if (!(descr->get_args & IW_PRIV_SIZE_FIXED)) | |
1526 | extra_size = adjust_priv_size(descr->get_args, wrqu); | |
1527 | /* Re-adjust reply size */ | |
1528 | request->len = extra_size + IW_EV_POINT_LEN; | |
1529 | ||
1530 | /* Put the iwe header where it should, i.e. scrap the | |
1531 | * dummy pointer. */ | |
1532 | memcpy(buffer + IW_EV_POINT_OFF, request, IW_EV_LCP_LEN); | |
1533 | ||
1534 | #ifdef WE_RTNETLINK_DEBUG | |
1535 | printk(KERN_DEBUG "%s (WE.r) : Reply 0x%04X, hdr_len %d, tokens %d, extra_size %d, buffer_size %d\n", dev->name, cmd, hdr_len, wrqu->data.length, extra_size, buffer_size); | |
1536 | #endif /* WE_RTNETLINK_DEBUG */ | |
1537 | } | |
1538 | ||
1539 | /* Return the buffer to the caller */ | |
1540 | if (!ret) { | |
1541 | *p_buf = buffer; | |
1542 | *p_len = request->len; | |
1543 | } else { | |
1544 | /* Cleanup */ | |
1545 | if(buffer) | |
1546 | kfree(buffer); | |
1547 | } | |
1548 | ||
1549 | return ret; | |
1550 | } | |
1551 | ||
1552 | /* ---------------------------------------------------------------- */ | |
1553 | /* | |
1554 | * Wrapper to call a private Wireless Extension SET handler. | |
1555 | * Same as above... | |
1556 | * It's not as nice and slimline as the standard wrapper. The cause | |
1557 | * is struct iw_priv_args, which was not really designed for the | |
1558 | * job we are going here. | |
1559 | * | |
1560 | * IMPORTANT : This function prevent to set and get data on the same | |
1561 | * IOCTL and enforce the SET/GET convention. Not doing it would be | |
1562 | * far too hairy... | |
1563 | * If you need to set and get data at the same time, please don't use | |
1564 | * a iw_handler but process it in your ioctl handler (i.e. use the | |
1565 | * old driver API). | |
1566 | */ | |
1567 | static inline int rtnetlink_private_set(struct net_device * dev, | |
1568 | struct iw_event * request, | |
1569 | int request_len, | |
1570 | iw_handler handler) | |
1571 | { | |
1572 | const struct iw_priv_args * descr = NULL; | |
1573 | unsigned int cmd; | |
1574 | union iwreq_data * wrqu; | |
1575 | union iwreq_data wrqu_point; | |
1576 | int hdr_len; | |
1577 | char * extra = NULL; | |
1578 | int extra_size = 0; | |
1579 | int offset = 0; /* For sub-ioctls */ | |
1580 | struct iw_request_info info; | |
1581 | int i; | |
1582 | int ret = -EINVAL; | |
1583 | ||
1584 | /* Get the description of the Request */ | |
1585 | cmd = request->cmd; | |
1586 | for(i = 0; i < dev->wireless_handlers->num_private_args; i++) | |
1587 | if(cmd == dev->wireless_handlers->private_args[i].cmd) { | |
1588 | descr = &(dev->wireless_handlers->private_args[i]); | |
1589 | break; | |
1590 | } | |
1591 | if(descr == NULL) | |
1592 | return -EOPNOTSUPP; | |
1593 | ||
1594 | #ifdef WE_RTNETLINK_DEBUG | |
1595 | printk(KERN_DEBUG "%s (WE.r) : Found private handler for 0x%04X\n", | |
1596 | ifr->ifr_name, cmd); | |
1597 | printk(KERN_DEBUG "%s (WE.r) : Name %s, set %X, get %X\n", | |
1598 | dev->name, descr->name, descr->set_args, descr->get_args); | |
1599 | #endif /* WE_RTNETLINK_DEBUG */ | |
1600 | ||
1601 | /* Compute the size of the set arguments */ | |
1602 | /* Check for sub-ioctl handler */ | |
1603 | if(descr->name[0] == '\0') | |
1604 | /* Reserve one int for sub-ioctl index */ | |
1605 | offset = sizeof(__u32); | |
1606 | ||
1607 | /* Size of set arguments */ | |
1608 | extra_size = get_priv_size(descr->set_args); | |
1609 | ||
1610 | /* Does it fits in wrqu ? */ | |
1611 | if((descr->set_args & IW_PRIV_SIZE_FIXED) && | |
1612 | (extra_size <= IFNAMSIZ)) { | |
1613 | hdr_len = IW_EV_LCP_LEN + extra_size; | |
1614 | extra_size = 0; | |
1615 | } else { | |
1616 | hdr_len = IW_EV_POINT_LEN; | |
1617 | } | |
1618 | ||
1619 | /* Extract fixed header from request. This is properly aligned. */ | |
1620 | wrqu = &request->u; | |
1621 | ||
1622 | /* Check if wrqu is complete */ | |
1623 | if(request_len < hdr_len) { | |
1624 | #ifdef WE_RTNETLINK_DEBUG | |
1625 | printk(KERN_DEBUG | |
1626 | "%s (WE.r) : Wireless request too short (%d)\n", | |
1627 | dev->name, request_len); | |
1628 | #endif /* WE_RTNETLINK_DEBUG */ | |
1629 | return -EINVAL; | |
1630 | } | |
1631 | ||
1632 | /* Prepare the call */ | |
1633 | info.cmd = cmd; | |
1634 | info.flags = 0; | |
1635 | ||
1636 | /* Check if we have a pointer to user space data or not. */ | |
1637 | if(extra_size == 0) { | |
1638 | ||
1639 | /* No extra arguments. Trivial to handle */ | |
1640 | ret = handler(dev, &info, wrqu, (char *) wrqu); | |
1641 | ||
1642 | } else { | |
1643 | int extra_len; | |
1644 | ||
1645 | /* Put wrqu in the right place (skip pointer) */ | |
1646 | memcpy(((char *) &wrqu_point) + IW_EV_POINT_OFF, | |
1647 | wrqu, IW_EV_POINT_LEN - IW_EV_LCP_LEN); | |
1648 | ||
1649 | /* Does it fits within bounds ? */ | |
1650 | if(wrqu_point.data.length > (descr->set_args & | |
1651 | IW_PRIV_SIZE_MASK)) | |
1652 | return -E2BIG; | |
1653 | ||
1654 | /* Real length of payload */ | |
1655 | extra_len = adjust_priv_size(descr->set_args, &wrqu_point); | |
1656 | ||
1657 | /* Check if request is self consistent */ | |
1658 | if((request_len - hdr_len) < extra_len) { | |
1659 | #ifdef WE_RTNETLINK_DEBUG | |
1660 | printk(KERN_DEBUG "%s (WE.r) : Wireless request data too short (%d)\n", | |
1661 | dev->name, extra_size); | |
1662 | #endif /* WE_RTNETLINK_DEBUG */ | |
1663 | return -EINVAL; | |
1664 | } | |
1665 | ||
1666 | #ifdef WE_RTNETLINK_DEBUG | |
1667 | printk(KERN_DEBUG "%s (WE.r) : Malloc %d bytes\n", | |
1668 | dev->name, extra_size); | |
1669 | #endif /* WE_RTNETLINK_DEBUG */ | |
1670 | ||
1671 | /* Always allocate for max space. Easier, and won't last | |
1672 | * long... */ | |
1673 | extra = kmalloc(extra_size, GFP_KERNEL); | |
1674 | if (extra == NULL) | |
1675 | return -ENOMEM; | |
1676 | ||
1677 | /* Copy extra in aligned buffer */ | |
1678 | memcpy(extra, ((char *) request) + hdr_len, extra_len); | |
1679 | ||
1680 | /* Call the handler */ | |
1681 | ret = handler(dev, &info, &wrqu_point, extra); | |
1682 | ||
1683 | /* Cleanup - I told you it wasn't that long ;-) */ | |
1684 | kfree(extra); | |
1685 | } | |
1686 | ||
1687 | /* Call commit handler if needed and defined */ | |
1688 | if(ret == -EIWCOMMIT) | |
1689 | ret = call_commit_handler(dev); | |
1690 | ||
1691 | return ret; | |
1692 | } | |
1693 | ||
1694 | /* ---------------------------------------------------------------- */ | |
1695 | /* | |
1696 | * Main RtNetlink dispatcher. Called from the main networking code | |
1697 | * (do_getlink() in net/core/rtnetlink.c). | |
1698 | * Check the type of Request and call the appropriate wrapper... | |
1699 | */ | |
1700 | int wireless_rtnetlink_get(struct net_device * dev, | |
1701 | char * data, | |
1702 | int len, | |
1703 | char ** p_buf, | |
1704 | int * p_len) | |
1705 | { | |
1706 | struct iw_event * request = (struct iw_event *) data; | |
1707 | iw_handler handler; | |
1708 | ||
1709 | /* Check length */ | |
1710 | if(len < IW_EV_LCP_LEN) { | |
1711 | printk(KERN_DEBUG "%s (WE.r) : RtNetlink request too short (%d)\n", | |
1712 | dev->name, len); | |
1713 | return -EINVAL; | |
1714 | } | |
1715 | ||
1716 | /* ReCheck length (len may have padding) */ | |
1717 | if(request->len > len) { | |
1718 | printk(KERN_DEBUG "%s (WE.r) : RtNetlink request len invalid (%d-%d)\n", | |
1719 | dev->name, request->len, len); | |
1720 | return -EINVAL; | |
1721 | } | |
1722 | ||
1723 | /* Only accept GET requests in here */ | |
1724 | if(!IW_IS_GET(request->cmd)) | |
1725 | return -EOPNOTSUPP; | |
1726 | ||
848ef855 JT |
1727 | /* If command is `get the encoding parameters', check if |
1728 | * the user has the right to do it */ | |
1729 | if (request->cmd == SIOCGIWENCODE || | |
1730 | request->cmd == SIOCGIWENCODEEXT) { | |
1731 | if (!capable(CAP_NET_ADMIN)) | |
1732 | return -EPERM; | |
1733 | } | |
1734 | ||
711e2c33 JT |
1735 | /* Special cases */ |
1736 | if(request->cmd == SIOCGIWSTATS) | |
1737 | /* Get Wireless Stats */ | |
1738 | return rtnetlink_standard_get(dev, | |
1739 | request, | |
1740 | request->len, | |
1741 | &iw_handler_get_iwstats, | |
1742 | p_buf, p_len); | |
1743 | if(request->cmd == SIOCGIWPRIV) { | |
1744 | /* Check if we have some wireless handlers defined */ | |
1745 | if(dev->wireless_handlers == NULL) | |
1746 | return -EOPNOTSUPP; | |
1747 | /* Get Wireless Stats */ | |
1748 | return rtnetlink_standard_get(dev, | |
1749 | request, | |
1750 | request->len, | |
1751 | &iw_handler_get_private, | |
1752 | p_buf, p_len); | |
1753 | } | |
1754 | ||
1755 | /* Basic check */ | |
1756 | if (!netif_device_present(dev)) | |
1757 | return -ENODEV; | |
1758 | ||
1759 | /* Try to find the handler */ | |
1760 | handler = get_handler(dev, request->cmd); | |
1761 | if(handler != NULL) { | |
1762 | /* Standard and private are not the same */ | |
1763 | if(request->cmd < SIOCIWFIRSTPRIV) | |
1764 | return rtnetlink_standard_get(dev, | |
1765 | request, | |
1766 | request->len, | |
1767 | handler, | |
1768 | p_buf, p_len); | |
1769 | else | |
1770 | return rtnetlink_private_get(dev, | |
1771 | request, | |
1772 | request->len, | |
1773 | handler, | |
1774 | p_buf, p_len); | |
1775 | } | |
1776 | ||
1777 | return -EOPNOTSUPP; | |
1778 | } | |
1779 | ||
1780 | /* ---------------------------------------------------------------- */ | |
1781 | /* | |
1782 | * Main RtNetlink dispatcher. Called from the main networking code | |
1783 | * (do_setlink() in net/core/rtnetlink.c). | |
1784 | * Check the type of Request and call the appropriate wrapper... | |
1785 | */ | |
1786 | int wireless_rtnetlink_set(struct net_device * dev, | |
1787 | char * data, | |
1788 | int len) | |
1789 | { | |
1790 | struct iw_event * request = (struct iw_event *) data; | |
1791 | iw_handler handler; | |
1792 | ||
1793 | /* Check length */ | |
1794 | if(len < IW_EV_LCP_LEN) { | |
1795 | printk(KERN_DEBUG "%s (WE.r) : RtNetlink request too short (%d)\n", | |
1796 | dev->name, len); | |
1797 | return -EINVAL; | |
1798 | } | |
1799 | ||
1800 | /* ReCheck length (len may have padding) */ | |
1801 | if(request->len > len) { | |
1802 | printk(KERN_DEBUG "%s (WE.r) : RtNetlink request len invalid (%d-%d)\n", | |
1803 | dev->name, request->len, len); | |
1804 | return -EINVAL; | |
1805 | } | |
1806 | ||
1807 | /* Only accept SET requests in here */ | |
1808 | if(!IW_IS_SET(request->cmd)) | |
1809 | return -EOPNOTSUPP; | |
1810 | ||
1811 | /* Basic check */ | |
1812 | if (!netif_device_present(dev)) | |
1813 | return -ENODEV; | |
1814 | ||
1815 | /* New driver API : try to find the handler */ | |
1816 | handler = get_handler(dev, request->cmd); | |
1817 | if(handler != NULL) { | |
1818 | /* Standard and private are not the same */ | |
1819 | if(request->cmd < SIOCIWFIRSTPRIV) | |
1820 | return rtnetlink_standard_set(dev, | |
1821 | request, | |
1822 | request->len, | |
1823 | handler); | |
1824 | else | |
1825 | return rtnetlink_private_set(dev, | |
1826 | request, | |
1827 | request->len, | |
1828 | handler); | |
1829 | } | |
1830 | ||
1831 | return -EOPNOTSUPP; | |
1832 | } | |
1833 | #endif /* CONFIG_NET_WIRELESS_RTNETLINK */ | |
1834 | ||
1835 | ||
1da177e4 LT |
1836 | /************************* EVENT PROCESSING *************************/ |
1837 | /* | |
1838 | * Process events generated by the wireless layer or the driver. | |
1839 | * Most often, the event will be propagated through rtnetlink | |
1840 | */ | |
1841 | ||
711e2c33 | 1842 | #ifdef WE_EVENT_RTNETLINK |
baef1865 JL |
1843 | /* ---------------------------------------------------------------- */ |
1844 | /* | |
1845 | * Locking... | |
1846 | * ---------- | |
1847 | * | |
1848 | * Thanks to Herbert Xu <herbert@gondor.apana.org.au> for fixing | |
1849 | * the locking issue in here and implementing this code ! | |
1850 | * | |
1851 | * The issue : wireless_send_event() is often called in interrupt context, | |
1852 | * while the Netlink layer can never be called in interrupt context. | |
1853 | * The fully formed RtNetlink events are queued, and then a tasklet is run | |
1854 | * to feed those to Netlink. | |
1855 | * The skb_queue is interrupt safe, and its lock is not held while calling | |
1856 | * Netlink, so there is no possibility of dealock. | |
1857 | * Jean II | |
1858 | */ | |
1859 | ||
782a6675 HX |
1860 | static struct sk_buff_head wireless_nlevent_queue; |
1861 | ||
baef1865 JL |
1862 | static int __init wireless_nlevent_init(void) |
1863 | { | |
1864 | skb_queue_head_init(&wireless_nlevent_queue); | |
1865 | return 0; | |
1866 | } | |
1867 | ||
1868 | subsys_initcall(wireless_nlevent_init); | |
1869 | ||
782a6675 HX |
1870 | static void wireless_nlevent_process(unsigned long data) |
1871 | { | |
1872 | struct sk_buff *skb; | |
1873 | ||
1874 | while ((skb = skb_dequeue(&wireless_nlevent_queue))) | |
bd5785ba | 1875 | rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); |
782a6675 HX |
1876 | } |
1877 | ||
1878 | static DECLARE_TASKLET(wireless_nlevent_tasklet, wireless_nlevent_process, 0); | |
1879 | ||
1da177e4 LT |
1880 | /* ---------------------------------------------------------------- */ |
1881 | /* | |
1882 | * Fill a rtnetlink message with our event data. | |
1883 | * Note that we propage only the specified event and don't dump the | |
1884 | * current wireless config. Dumping the wireless config is far too | |
1885 | * expensive (for each parameter, the driver need to query the hardware). | |
1886 | */ | |
1887 | static inline int rtnetlink_fill_iwinfo(struct sk_buff * skb, | |
1888 | struct net_device * dev, | |
1889 | int type, | |
1890 | char * event, | |
1891 | int event_len) | |
1892 | { | |
1893 | struct ifinfomsg *r; | |
1894 | struct nlmsghdr *nlh; | |
1895 | unsigned char *b = skb->tail; | |
1896 | ||
1897 | nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(*r)); | |
1898 | r = NLMSG_DATA(nlh); | |
1899 | r->ifi_family = AF_UNSPEC; | |
9ef1d4c7 | 1900 | r->__ifi_pad = 0; |
1da177e4 LT |
1901 | r->ifi_type = dev->type; |
1902 | r->ifi_index = dev->ifindex; | |
711e2c33 | 1903 | r->ifi_flags = dev_get_flags(dev); |
1da177e4 LT |
1904 | r->ifi_change = 0; /* Wireless changes don't affect those flags */ |
1905 | ||
1906 | /* Add the wireless events in the netlink packet */ | |
711e2c33 | 1907 | RTA_PUT(skb, IFLA_WIRELESS, event_len, event); |
1da177e4 LT |
1908 | |
1909 | nlh->nlmsg_len = skb->tail - b; | |
1910 | return skb->len; | |
1911 | ||
1912 | nlmsg_failure: | |
1913 | rtattr_failure: | |
1914 | skb_trim(skb, b - skb->data); | |
1915 | return -1; | |
1916 | } | |
1917 | ||
1918 | /* ---------------------------------------------------------------- */ | |
1919 | /* | |
1920 | * Create and broadcast and send it on the standard rtnetlink socket | |
1921 | * This is a pure clone rtmsg_ifinfo() in net/core/rtnetlink.c | |
1922 | * Andrzej Krzysztofowicz mandated that I used a IFLA_XXX field | |
1923 | * within a RTM_NEWLINK event. | |
1924 | */ | |
1925 | static inline void rtmsg_iwinfo(struct net_device * dev, | |
1926 | char * event, | |
1927 | int event_len) | |
1928 | { | |
1929 | struct sk_buff *skb; | |
1930 | int size = NLMSG_GOODSIZE; | |
1931 | ||
1932 | skb = alloc_skb(size, GFP_ATOMIC); | |
1933 | if (!skb) | |
1934 | return; | |
1935 | ||
1936 | if (rtnetlink_fill_iwinfo(skb, dev, RTM_NEWLINK, | |
1937 | event, event_len) < 0) { | |
1938 | kfree_skb(skb); | |
1939 | return; | |
1940 | } | |
ac6d439d | 1941 | NETLINK_CB(skb).dst_group = RTNLGRP_LINK; |
782a6675 HX |
1942 | skb_queue_tail(&wireless_nlevent_queue, skb); |
1943 | tasklet_schedule(&wireless_nlevent_tasklet); | |
1944 | } | |
1945 | ||
711e2c33 | 1946 | #endif /* WE_EVENT_RTNETLINK */ |
1da177e4 LT |
1947 | |
1948 | /* ---------------------------------------------------------------- */ | |
1949 | /* | |
1950 | * Main event dispatcher. Called from other parts and drivers. | |
1951 | * Send the event on the appropriate channels. | |
1952 | * May be called from interrupt context. | |
1953 | */ | |
1954 | void wireless_send_event(struct net_device * dev, | |
1955 | unsigned int cmd, | |
1956 | union iwreq_data * wrqu, | |
1957 | char * extra) | |
1958 | { | |
1959 | const struct iw_ioctl_description * descr = NULL; | |
1960 | int extra_len = 0; | |
1961 | struct iw_event *event; /* Mallocated whole event */ | |
1962 | int event_len; /* Its size */ | |
1963 | int hdr_len; /* Size of the event header */ | |
6582c164 | 1964 | int wrqu_off = 0; /* Offset in wrqu */ |
1da177e4 LT |
1965 | /* Don't "optimise" the following variable, it will crash */ |
1966 | unsigned cmd_index; /* *MUST* be unsigned */ | |
1967 | ||
6582c164 | 1968 | /* Get the description of the Event */ |
1da177e4 LT |
1969 | if(cmd <= SIOCIWLAST) { |
1970 | cmd_index = cmd - SIOCIWFIRST; | |
1971 | if(cmd_index < standard_ioctl_num) | |
1972 | descr = &(standard_ioctl[cmd_index]); | |
1973 | } else { | |
1974 | cmd_index = cmd - IWEVFIRST; | |
1975 | if(cmd_index < standard_event_num) | |
1976 | descr = &(standard_event[cmd_index]); | |
1977 | } | |
1978 | /* Don't accept unknown events */ | |
1979 | if(descr == NULL) { | |
1980 | /* Note : we don't return an error to the driver, because | |
1981 | * the driver would not know what to do about it. It can't | |
1982 | * return an error to the user, because the event is not | |
1983 | * initiated by a user request. | |
1984 | * The best the driver could do is to log an error message. | |
1985 | * We will do it ourselves instead... | |
1986 | */ | |
1987 | printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n", | |
1988 | dev->name, cmd); | |
1989 | return; | |
1990 | } | |
1991 | #ifdef WE_EVENT_DEBUG | |
1992 | printk(KERN_DEBUG "%s (WE) : Got event 0x%04X\n", | |
1993 | dev->name, cmd); | |
1994 | printk(KERN_DEBUG "%s (WE) : Header type : %d, Token type : %d, size : %d, token : %d\n", dev->name, descr->header_type, descr->token_type, descr->token_size, descr->max_tokens); | |
1995 | #endif /* WE_EVENT_DEBUG */ | |
1996 | ||
1997 | /* Check extra parameters and set extra_len */ | |
1998 | if(descr->header_type == IW_HEADER_TYPE_POINT) { | |
1999 | /* Check if number of token fits within bounds */ | |
2000 | if(wrqu->data.length > descr->max_tokens) { | |
2001 | printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length); | |
2002 | return; | |
2003 | } | |
2004 | if(wrqu->data.length < descr->min_tokens) { | |
2005 | printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, wrqu->data.length); | |
2006 | return; | |
2007 | } | |
2008 | /* Calculate extra_len - extra is NULL for restricted events */ | |
2009 | if(extra != NULL) | |
2010 | extra_len = wrqu->data.length * descr->token_size; | |
6582c164 JT |
2011 | /* Always at an offset in wrqu */ |
2012 | wrqu_off = IW_EV_POINT_OFF; | |
1da177e4 LT |
2013 | #ifdef WE_EVENT_DEBUG |
2014 | printk(KERN_DEBUG "%s (WE) : Event 0x%04X, tokens %d, extra_len %d\n", dev->name, cmd, wrqu->data.length, extra_len); | |
2015 | #endif /* WE_EVENT_DEBUG */ | |
2016 | } | |
2017 | ||
2018 | /* Total length of the event */ | |
2019 | hdr_len = event_type_size[descr->header_type]; | |
2020 | event_len = hdr_len + extra_len; | |
2021 | ||
2022 | #ifdef WE_EVENT_DEBUG | |
6582c164 | 2023 | printk(KERN_DEBUG "%s (WE) : Event 0x%04X, hdr_len %d, wrqu_off %d, event_len %d\n", dev->name, cmd, hdr_len, wrqu_off, event_len); |
1da177e4 LT |
2024 | #endif /* WE_EVENT_DEBUG */ |
2025 | ||
2026 | /* Create temporary buffer to hold the event */ | |
2027 | event = kmalloc(event_len, GFP_ATOMIC); | |
2028 | if(event == NULL) | |
2029 | return; | |
2030 | ||
2031 | /* Fill event */ | |
2032 | event->len = event_len; | |
2033 | event->cmd = cmd; | |
6582c164 | 2034 | memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN); |
1da177e4 LT |
2035 | if(extra != NULL) |
2036 | memcpy(((char *) event) + hdr_len, extra, extra_len); | |
2037 | ||
711e2c33 JT |
2038 | #ifdef WE_EVENT_RTNETLINK |
2039 | /* Send via the RtNetlink event channel */ | |
1da177e4 | 2040 | rtmsg_iwinfo(dev, (char *) event, event_len); |
711e2c33 | 2041 | #endif /* WE_EVENT_RTNETLINK */ |
1da177e4 LT |
2042 | |
2043 | /* Cleanup */ | |
2044 | kfree(event); | |
2045 | ||
2046 | return; /* Always success, I guess ;-) */ | |
2047 | } | |
2048 | ||
2049 | /********************** ENHANCED IWSPY SUPPORT **********************/ | |
2050 | /* | |
2051 | * In the old days, the driver was handling spy support all by itself. | |
2052 | * Now, the driver can delegate this task to Wireless Extensions. | |
2053 | * It needs to use those standard spy iw_handler in struct iw_handler_def, | |
2054 | * push data to us via wireless_spy_update() and include struct iw_spy_data | |
6582c164 | 2055 | * in its private part (and export it in net_device->wireless_data->spy_data). |
1da177e4 LT |
2056 | * One of the main advantage of centralising spy support here is that |
2057 | * it becomes much easier to improve and extend it without having to touch | |
2058 | * the drivers. One example is the addition of the Spy-Threshold events. | |
2059 | */ | |
2060 | ||
2061 | /* ---------------------------------------------------------------- */ | |
2062 | /* | |
2063 | * Return the pointer to the spy data in the driver. | |
2064 | * Because this is called on the Rx path via wireless_spy_update(), | |
2065 | * we want it to be efficient... | |
2066 | */ | |
2067 | static inline struct iw_spy_data * get_spydata(struct net_device *dev) | |
2068 | { | |
2069 | /* This is the new way */ | |
2070 | if(dev->wireless_data) | |
2071 | return(dev->wireless_data->spy_data); | |
6582c164 | 2072 | return NULL; |
1da177e4 LT |
2073 | } |
2074 | ||
2075 | /*------------------------------------------------------------------*/ | |
2076 | /* | |
2077 | * Standard Wireless Handler : set Spy List | |
2078 | */ | |
2079 | int iw_handler_set_spy(struct net_device * dev, | |
2080 | struct iw_request_info * info, | |
2081 | union iwreq_data * wrqu, | |
2082 | char * extra) | |
2083 | { | |
2084 | struct iw_spy_data * spydata = get_spydata(dev); | |
2085 | struct sockaddr * address = (struct sockaddr *) extra; | |
2086 | ||
1da177e4 LT |
2087 | /* Make sure driver is not buggy or using the old API */ |
2088 | if(!spydata) | |
2089 | return -EOPNOTSUPP; | |
2090 | ||
2091 | /* Disable spy collection while we copy the addresses. | |
2092 | * While we copy addresses, any call to wireless_spy_update() | |
2093 | * will NOP. This is OK, as anyway the addresses are changing. */ | |
2094 | spydata->spy_number = 0; | |
2095 | ||
2096 | /* We want to operate without locking, because wireless_spy_update() | |
2097 | * most likely will happen in the interrupt handler, and therefore | |
2098 | * have its own locking constraints and needs performance. | |
2099 | * The rtnl_lock() make sure we don't race with the other iw_handlers. | |
2100 | * This make sure wireless_spy_update() "see" that the spy list | |
2101 | * is temporarily disabled. */ | |
2102 | wmb(); | |
2103 | ||
2104 | /* Are there are addresses to copy? */ | |
2105 | if(wrqu->data.length > 0) { | |
2106 | int i; | |
2107 | ||
2108 | /* Copy addresses */ | |
2109 | for(i = 0; i < wrqu->data.length; i++) | |
2110 | memcpy(spydata->spy_address[i], address[i].sa_data, | |
2111 | ETH_ALEN); | |
2112 | /* Reset stats */ | |
2113 | memset(spydata->spy_stat, 0, | |
2114 | sizeof(struct iw_quality) * IW_MAX_SPY); | |
2115 | ||
2116 | #ifdef WE_SPY_DEBUG | |
6582c164 | 2117 | printk(KERN_DEBUG "iw_handler_set_spy() : wireless_data %p, spydata %p, num %d\n", dev->wireless_data, spydata, wrqu->data.length); |
1da177e4 LT |
2118 | for (i = 0; i < wrqu->data.length; i++) |
2119 | printk(KERN_DEBUG | |
2120 | "%02X:%02X:%02X:%02X:%02X:%02X \n", | |
2121 | spydata->spy_address[i][0], | |
2122 | spydata->spy_address[i][1], | |
2123 | spydata->spy_address[i][2], | |
2124 | spydata->spy_address[i][3], | |
2125 | spydata->spy_address[i][4], | |
2126 | spydata->spy_address[i][5]); | |
2127 | #endif /* WE_SPY_DEBUG */ | |
2128 | } | |
2129 | ||
2130 | /* Make sure above is updated before re-enabling */ | |
2131 | wmb(); | |
2132 | ||
2133 | /* Enable addresses */ | |
2134 | spydata->spy_number = wrqu->data.length; | |
2135 | ||
2136 | return 0; | |
2137 | } | |
2138 | ||
2139 | /*------------------------------------------------------------------*/ | |
2140 | /* | |
2141 | * Standard Wireless Handler : get Spy List | |
2142 | */ | |
2143 | int iw_handler_get_spy(struct net_device * dev, | |
2144 | struct iw_request_info * info, | |
2145 | union iwreq_data * wrqu, | |
2146 | char * extra) | |
2147 | { | |
2148 | struct iw_spy_data * spydata = get_spydata(dev); | |
2149 | struct sockaddr * address = (struct sockaddr *) extra; | |
2150 | int i; | |
2151 | ||
2152 | /* Make sure driver is not buggy or using the old API */ | |
2153 | if(!spydata) | |
2154 | return -EOPNOTSUPP; | |
2155 | ||
2156 | wrqu->data.length = spydata->spy_number; | |
2157 | ||
2158 | /* Copy addresses. */ | |
2159 | for(i = 0; i < spydata->spy_number; i++) { | |
2160 | memcpy(address[i].sa_data, spydata->spy_address[i], ETH_ALEN); | |
2161 | address[i].sa_family = AF_UNIX; | |
2162 | } | |
2163 | /* Copy stats to the user buffer (just after). */ | |
2164 | if(spydata->spy_number > 0) | |
2165 | memcpy(extra + (sizeof(struct sockaddr) *spydata->spy_number), | |
2166 | spydata->spy_stat, | |
2167 | sizeof(struct iw_quality) * spydata->spy_number); | |
2168 | /* Reset updated flags. */ | |
2169 | for(i = 0; i < spydata->spy_number; i++) | |
6582c164 | 2170 | spydata->spy_stat[i].updated &= ~IW_QUAL_ALL_UPDATED; |
1da177e4 LT |
2171 | return 0; |
2172 | } | |
2173 | ||
2174 | /*------------------------------------------------------------------*/ | |
2175 | /* | |
2176 | * Standard Wireless Handler : set spy threshold | |
2177 | */ | |
2178 | int iw_handler_set_thrspy(struct net_device * dev, | |
2179 | struct iw_request_info *info, | |
2180 | union iwreq_data * wrqu, | |
2181 | char * extra) | |
2182 | { | |
2183 | struct iw_spy_data * spydata = get_spydata(dev); | |
2184 | struct iw_thrspy * threshold = (struct iw_thrspy *) extra; | |
2185 | ||
2186 | /* Make sure driver is not buggy or using the old API */ | |
2187 | if(!spydata) | |
2188 | return -EOPNOTSUPP; | |
2189 | ||
2190 | /* Just do it */ | |
2191 | memcpy(&(spydata->spy_thr_low), &(threshold->low), | |
2192 | 2 * sizeof(struct iw_quality)); | |
2193 | ||
2194 | /* Clear flag */ | |
2195 | memset(spydata->spy_thr_under, '\0', sizeof(spydata->spy_thr_under)); | |
2196 | ||
2197 | #ifdef WE_SPY_DEBUG | |
2198 | printk(KERN_DEBUG "iw_handler_set_thrspy() : low %d ; high %d\n", spydata->spy_thr_low.level, spydata->spy_thr_high.level); | |
2199 | #endif /* WE_SPY_DEBUG */ | |
2200 | ||
2201 | return 0; | |
2202 | } | |
2203 | ||
2204 | /*------------------------------------------------------------------*/ | |
2205 | /* | |
2206 | * Standard Wireless Handler : get spy threshold | |
2207 | */ | |
2208 | int iw_handler_get_thrspy(struct net_device * dev, | |
2209 | struct iw_request_info *info, | |
2210 | union iwreq_data * wrqu, | |
2211 | char * extra) | |
2212 | { | |
2213 | struct iw_spy_data * spydata = get_spydata(dev); | |
2214 | struct iw_thrspy * threshold = (struct iw_thrspy *) extra; | |
2215 | ||
2216 | /* Make sure driver is not buggy or using the old API */ | |
2217 | if(!spydata) | |
2218 | return -EOPNOTSUPP; | |
2219 | ||
2220 | /* Just do it */ | |
2221 | memcpy(&(threshold->low), &(spydata->spy_thr_low), | |
2222 | 2 * sizeof(struct iw_quality)); | |
2223 | ||
2224 | return 0; | |
2225 | } | |
2226 | ||
2227 | /*------------------------------------------------------------------*/ | |
2228 | /* | |
2229 | * Prepare and send a Spy Threshold event | |
2230 | */ | |
2231 | static void iw_send_thrspy_event(struct net_device * dev, | |
2232 | struct iw_spy_data * spydata, | |
2233 | unsigned char * address, | |
2234 | struct iw_quality * wstats) | |
2235 | { | |
2236 | union iwreq_data wrqu; | |
2237 | struct iw_thrspy threshold; | |
2238 | ||
2239 | /* Init */ | |
2240 | wrqu.data.length = 1; | |
2241 | wrqu.data.flags = 0; | |
2242 | /* Copy address */ | |
2243 | memcpy(threshold.addr.sa_data, address, ETH_ALEN); | |
2244 | threshold.addr.sa_family = ARPHRD_ETHER; | |
2245 | /* Copy stats */ | |
2246 | memcpy(&(threshold.qual), wstats, sizeof(struct iw_quality)); | |
2247 | /* Copy also thresholds */ | |
2248 | memcpy(&(threshold.low), &(spydata->spy_thr_low), | |
2249 | 2 * sizeof(struct iw_quality)); | |
2250 | ||
2251 | #ifdef WE_SPY_DEBUG | |
2252 | printk(KERN_DEBUG "iw_send_thrspy_event() : address %02X:%02X:%02X:%02X:%02X:%02X, level %d, up = %d\n", | |
2253 | threshold.addr.sa_data[0], | |
2254 | threshold.addr.sa_data[1], | |
2255 | threshold.addr.sa_data[2], | |
2256 | threshold.addr.sa_data[3], | |
2257 | threshold.addr.sa_data[4], | |
2258 | threshold.addr.sa_data[5], threshold.qual.level); | |
2259 | #endif /* WE_SPY_DEBUG */ | |
2260 | ||
2261 | /* Send event to user space */ | |
2262 | wireless_send_event(dev, SIOCGIWTHRSPY, &wrqu, (char *) &threshold); | |
2263 | } | |
2264 | ||
2265 | /* ---------------------------------------------------------------- */ | |
2266 | /* | |
2267 | * Call for the driver to update the spy data. | |
2268 | * For now, the spy data is a simple array. As the size of the array is | |
2269 | * small, this is good enough. If we wanted to support larger number of | |
2270 | * spy addresses, we should use something more efficient... | |
2271 | */ | |
2272 | void wireless_spy_update(struct net_device * dev, | |
2273 | unsigned char * address, | |
2274 | struct iw_quality * wstats) | |
2275 | { | |
2276 | struct iw_spy_data * spydata = get_spydata(dev); | |
2277 | int i; | |
2278 | int match = -1; | |
2279 | ||
2280 | /* Make sure driver is not buggy or using the old API */ | |
2281 | if(!spydata) | |
2282 | return; | |
2283 | ||
2284 | #ifdef WE_SPY_DEBUG | |
6582c164 | 2285 | printk(KERN_DEBUG "wireless_spy_update() : wireless_data %p, spydata %p, address %02X:%02X:%02X:%02X:%02X:%02X\n", dev->wireless_data, spydata, address[0], address[1], address[2], address[3], address[4], address[5]); |
1da177e4 LT |
2286 | #endif /* WE_SPY_DEBUG */ |
2287 | ||
2288 | /* Update all records that match */ | |
2289 | for(i = 0; i < spydata->spy_number; i++) | |
d3f4a687 | 2290 | if(!compare_ether_addr(address, spydata->spy_address[i])) { |
1da177e4 LT |
2291 | memcpy(&(spydata->spy_stat[i]), wstats, |
2292 | sizeof(struct iw_quality)); | |
2293 | match = i; | |
2294 | } | |
2295 | ||
2296 | /* Generate an event if we cross the spy threshold. | |
2297 | * To avoid event storms, we have a simple hysteresis : we generate | |
2298 | * event only when we go under the low threshold or above the | |
2299 | * high threshold. */ | |
2300 | if(match >= 0) { | |
2301 | if(spydata->spy_thr_under[match]) { | |
2302 | if(wstats->level > spydata->spy_thr_high.level) { | |
2303 | spydata->spy_thr_under[match] = 0; | |
2304 | iw_send_thrspy_event(dev, spydata, | |
2305 | address, wstats); | |
2306 | } | |
2307 | } else { | |
2308 | if(wstats->level < spydata->spy_thr_low.level) { | |
2309 | spydata->spy_thr_under[match] = 1; | |
2310 | iw_send_thrspy_event(dev, spydata, | |
2311 | address, wstats); | |
2312 | } | |
2313 | } | |
2314 | } | |
2315 | } | |
2316 | ||
2317 | EXPORT_SYMBOL(iw_handler_get_spy); | |
2318 | EXPORT_SYMBOL(iw_handler_get_thrspy); | |
2319 | EXPORT_SYMBOL(iw_handler_set_spy); | |
2320 | EXPORT_SYMBOL(iw_handler_set_thrspy); | |
2321 | EXPORT_SYMBOL(wireless_send_event); | |
2322 | EXPORT_SYMBOL(wireless_spy_update); |