Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * This file implement the Wireless Extensions APIs. | |
3 | * | |
4 | * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com> | |
5 | * Copyright (c) 1997-2004 Jean Tourrilhes, All Rights Reserved. | |
6 | * | |
7 | * (As all part of the Linux kernel, this file is GPL) | |
8 | */ | |
9 | ||
10 | /************************** DOCUMENTATION **************************/ | |
11 | /* | |
12 | * API definition : | |
13 | * -------------- | |
14 | * See <linux/wireless.h> for details of the APIs and the rest. | |
15 | * | |
16 | * History : | |
17 | * ------- | |
18 | * | |
19 | * v1 - 5.12.01 - Jean II | |
20 | * o Created this file. | |
21 | * | |
22 | * v2 - 13.12.01 - Jean II | |
23 | * o Move /proc/net/wireless stuff from net/core/dev.c to here | |
24 | * o Make Wireless Extension IOCTLs go through here | |
25 | * o Added iw_handler handling ;-) | |
26 | * o Added standard ioctl description | |
27 | * o Initial dumb commit strategy based on orinoco.c | |
28 | * | |
29 | * v3 - 19.12.01 - Jean II | |
30 | * o Make sure we don't go out of standard_ioctl[] in ioctl_standard_call | |
31 | * o Add event dispatcher function | |
32 | * o Add event description | |
33 | * o Propagate events as rtnetlink IFLA_WIRELESS option | |
34 | * o Generate event on selected SET requests | |
35 | * | |
36 | * v4 - 18.04.02 - Jean II | |
37 | * o Fix stupid off by one in iw_ioctl_description : IW_ESSID_MAX_SIZE + 1 | |
38 | * | |
39 | * v5 - 21.06.02 - Jean II | |
40 | * o Add IW_PRIV_TYPE_ADDR in priv_type_size (+cleanup) | |
41 | * o Reshuffle IW_HEADER_TYPE_XXX to map IW_PRIV_TYPE_XXX changes | |
42 | * o Add IWEVCUSTOM for driver specific event/scanning token | |
43 | * o Turn on WE_STRICT_WRITE by default + kernel warning | |
44 | * o Fix WE_STRICT_WRITE in ioctl_export_private() (32 => iw_num) | |
45 | * o Fix off-by-one in test (extra_size <= IFNAMSIZ) | |
46 | * | |
47 | * v6 - 9.01.03 - Jean II | |
48 | * o Add common spy support : iw_handler_set_spy(), wireless_spy_update() | |
49 | * o Add enhanced spy support : iw_handler_set_thrspy() and event. | |
50 | * o Add WIRELESS_EXT version display in /proc/net/wireless | |
51 | * | |
52 | * v6 - 18.06.04 - Jean II | |
53 | * o Change get_spydata() method for added safety | |
54 | * o Remove spy #ifdef, they are always on -> cleaner code | |
55 | * o Allow any size GET request if user specifies length > max | |
56 | * and if request has IW_DESCR_FLAG_NOMAX flag or is SIOCGIWPRIV | |
57 | * o Start migrating get_wireless_stats to struct iw_handler_def | |
58 | * o Add wmb() in iw_handler_set_spy() for non-coherent archs/cpus | |
59 | * Based on patch from Pavel Roskin <proski@gnu.org> : | |
60 | * o Fix kernel data leak to user space in private handler handling | |
61 | */ | |
62 | ||
63 | /***************************** INCLUDES *****************************/ | |
64 | ||
65 | #include <linux/config.h> /* Not needed ??? */ | |
66 | #include <linux/module.h> | |
67 | #include <linux/types.h> /* off_t */ | |
68 | #include <linux/netdevice.h> /* struct ifreq, dev_get_by_name() */ | |
69 | #include <linux/proc_fs.h> | |
70 | #include <linux/rtnetlink.h> /* rtnetlink stuff */ | |
71 | #include <linux/seq_file.h> | |
72 | #include <linux/init.h> /* for __init */ | |
73 | #include <linux/if_arp.h> /* ARPHRD_ETHER */ | |
74 | ||
75 | #include <linux/wireless.h> /* Pretty obvious */ | |
76 | #include <net/iw_handler.h> /* New driver API */ | |
77 | ||
78 | #include <asm/uaccess.h> /* copy_to_user() */ | |
79 | ||
80 | /**************************** CONSTANTS ****************************/ | |
81 | ||
82 | /* Debugging stuff */ | |
83 | #undef WE_IOCTL_DEBUG /* Debug IOCTL API */ | |
84 | #undef WE_EVENT_DEBUG /* Debug Event dispatcher */ | |
85 | #undef WE_SPY_DEBUG /* Debug enhanced spy support */ | |
86 | ||
87 | /* Options */ | |
88 | #define WE_EVENT_NETLINK /* Propagate events using rtnetlink */ | |
89 | #define WE_SET_EVENT /* Generate an event on some set commands */ | |
90 | ||
91 | /************************* GLOBAL VARIABLES *************************/ | |
92 | /* | |
93 | * You should not use global variables, because of re-entrancy. | |
94 | * On our case, it's only const, so it's OK... | |
95 | */ | |
96 | /* | |
97 | * Meta-data about all the standard Wireless Extension request we | |
98 | * know about. | |
99 | */ | |
100 | static const struct iw_ioctl_description standard_ioctl[] = { | |
101 | [SIOCSIWCOMMIT - SIOCIWFIRST] = { | |
102 | .header_type = IW_HEADER_TYPE_NULL, | |
103 | }, | |
104 | [SIOCGIWNAME - SIOCIWFIRST] = { | |
105 | .header_type = IW_HEADER_TYPE_CHAR, | |
106 | .flags = IW_DESCR_FLAG_DUMP, | |
107 | }, | |
108 | [SIOCSIWNWID - SIOCIWFIRST] = { | |
109 | .header_type = IW_HEADER_TYPE_PARAM, | |
110 | .flags = IW_DESCR_FLAG_EVENT, | |
111 | }, | |
112 | [SIOCGIWNWID - SIOCIWFIRST] = { | |
113 | .header_type = IW_HEADER_TYPE_PARAM, | |
114 | .flags = IW_DESCR_FLAG_DUMP, | |
115 | }, | |
116 | [SIOCSIWFREQ - SIOCIWFIRST] = { | |
117 | .header_type = IW_HEADER_TYPE_FREQ, | |
118 | .flags = IW_DESCR_FLAG_EVENT, | |
119 | }, | |
120 | [SIOCGIWFREQ - SIOCIWFIRST] = { | |
121 | .header_type = IW_HEADER_TYPE_FREQ, | |
122 | .flags = IW_DESCR_FLAG_DUMP, | |
123 | }, | |
124 | [SIOCSIWMODE - SIOCIWFIRST] = { | |
125 | .header_type = IW_HEADER_TYPE_UINT, | |
126 | .flags = IW_DESCR_FLAG_EVENT, | |
127 | }, | |
128 | [SIOCGIWMODE - SIOCIWFIRST] = { | |
129 | .header_type = IW_HEADER_TYPE_UINT, | |
130 | .flags = IW_DESCR_FLAG_DUMP, | |
131 | }, | |
132 | [SIOCSIWSENS - SIOCIWFIRST] = { | |
133 | .header_type = IW_HEADER_TYPE_PARAM, | |
134 | }, | |
135 | [SIOCGIWSENS - SIOCIWFIRST] = { | |
136 | .header_type = IW_HEADER_TYPE_PARAM, | |
137 | }, | |
138 | [SIOCSIWRANGE - SIOCIWFIRST] = { | |
139 | .header_type = IW_HEADER_TYPE_NULL, | |
140 | }, | |
141 | [SIOCGIWRANGE - SIOCIWFIRST] = { | |
142 | .header_type = IW_HEADER_TYPE_POINT, | |
143 | .token_size = 1, | |
144 | .max_tokens = sizeof(struct iw_range), | |
145 | .flags = IW_DESCR_FLAG_DUMP, | |
146 | }, | |
147 | [SIOCSIWPRIV - SIOCIWFIRST] = { | |
148 | .header_type = IW_HEADER_TYPE_NULL, | |
149 | }, | |
150 | [SIOCGIWPRIV - SIOCIWFIRST] = { /* (handled directly by us) */ | |
151 | .header_type = IW_HEADER_TYPE_NULL, | |
152 | }, | |
153 | [SIOCSIWSTATS - SIOCIWFIRST] = { | |
154 | .header_type = IW_HEADER_TYPE_NULL, | |
155 | }, | |
156 | [SIOCGIWSTATS - SIOCIWFIRST] = { /* (handled directly by us) */ | |
157 | .header_type = IW_HEADER_TYPE_NULL, | |
158 | .flags = IW_DESCR_FLAG_DUMP, | |
159 | }, | |
160 | [SIOCSIWSPY - SIOCIWFIRST] = { | |
161 | .header_type = IW_HEADER_TYPE_POINT, | |
162 | .token_size = sizeof(struct sockaddr), | |
163 | .max_tokens = IW_MAX_SPY, | |
164 | }, | |
165 | [SIOCGIWSPY - SIOCIWFIRST] = { | |
166 | .header_type = IW_HEADER_TYPE_POINT, | |
167 | .token_size = sizeof(struct sockaddr) + | |
168 | sizeof(struct iw_quality), | |
169 | .max_tokens = IW_MAX_SPY, | |
170 | }, | |
171 | [SIOCSIWTHRSPY - SIOCIWFIRST] = { | |
172 | .header_type = IW_HEADER_TYPE_POINT, | |
173 | .token_size = sizeof(struct iw_thrspy), | |
174 | .min_tokens = 1, | |
175 | .max_tokens = 1, | |
176 | }, | |
177 | [SIOCGIWTHRSPY - SIOCIWFIRST] = { | |
178 | .header_type = IW_HEADER_TYPE_POINT, | |
179 | .token_size = sizeof(struct iw_thrspy), | |
180 | .min_tokens = 1, | |
181 | .max_tokens = 1, | |
182 | }, | |
183 | [SIOCSIWAP - SIOCIWFIRST] = { | |
184 | .header_type = IW_HEADER_TYPE_ADDR, | |
185 | }, | |
186 | [SIOCGIWAP - SIOCIWFIRST] = { | |
187 | .header_type = IW_HEADER_TYPE_ADDR, | |
188 | .flags = IW_DESCR_FLAG_DUMP, | |
189 | }, | |
190 | [SIOCGIWAPLIST - SIOCIWFIRST] = { | |
191 | .header_type = IW_HEADER_TYPE_POINT, | |
192 | .token_size = sizeof(struct sockaddr) + | |
193 | sizeof(struct iw_quality), | |
194 | .max_tokens = IW_MAX_AP, | |
195 | .flags = IW_DESCR_FLAG_NOMAX, | |
196 | }, | |
197 | [SIOCSIWSCAN - SIOCIWFIRST] = { | |
198 | .header_type = IW_HEADER_TYPE_PARAM, | |
199 | }, | |
200 | [SIOCGIWSCAN - SIOCIWFIRST] = { | |
201 | .header_type = IW_HEADER_TYPE_POINT, | |
202 | .token_size = 1, | |
203 | .max_tokens = IW_SCAN_MAX_DATA, | |
204 | .flags = IW_DESCR_FLAG_NOMAX, | |
205 | }, | |
206 | [SIOCSIWESSID - SIOCIWFIRST] = { | |
207 | .header_type = IW_HEADER_TYPE_POINT, | |
208 | .token_size = 1, | |
209 | .max_tokens = IW_ESSID_MAX_SIZE + 1, | |
210 | .flags = IW_DESCR_FLAG_EVENT, | |
211 | }, | |
212 | [SIOCGIWESSID - SIOCIWFIRST] = { | |
213 | .header_type = IW_HEADER_TYPE_POINT, | |
214 | .token_size = 1, | |
215 | .max_tokens = IW_ESSID_MAX_SIZE + 1, | |
216 | .flags = IW_DESCR_FLAG_DUMP, | |
217 | }, | |
218 | [SIOCSIWNICKN - SIOCIWFIRST] = { | |
219 | .header_type = IW_HEADER_TYPE_POINT, | |
220 | .token_size = 1, | |
221 | .max_tokens = IW_ESSID_MAX_SIZE + 1, | |
222 | }, | |
223 | [SIOCGIWNICKN - SIOCIWFIRST] = { | |
224 | .header_type = IW_HEADER_TYPE_POINT, | |
225 | .token_size = 1, | |
226 | .max_tokens = IW_ESSID_MAX_SIZE + 1, | |
227 | }, | |
228 | [SIOCSIWRATE - SIOCIWFIRST] = { | |
229 | .header_type = IW_HEADER_TYPE_PARAM, | |
230 | }, | |
231 | [SIOCGIWRATE - SIOCIWFIRST] = { | |
232 | .header_type = IW_HEADER_TYPE_PARAM, | |
233 | }, | |
234 | [SIOCSIWRTS - SIOCIWFIRST] = { | |
235 | .header_type = IW_HEADER_TYPE_PARAM, | |
236 | }, | |
237 | [SIOCGIWRTS - SIOCIWFIRST] = { | |
238 | .header_type = IW_HEADER_TYPE_PARAM, | |
239 | }, | |
240 | [SIOCSIWFRAG - SIOCIWFIRST] = { | |
241 | .header_type = IW_HEADER_TYPE_PARAM, | |
242 | }, | |
243 | [SIOCGIWFRAG - SIOCIWFIRST] = { | |
244 | .header_type = IW_HEADER_TYPE_PARAM, | |
245 | }, | |
246 | [SIOCSIWTXPOW - SIOCIWFIRST] = { | |
247 | .header_type = IW_HEADER_TYPE_PARAM, | |
248 | }, | |
249 | [SIOCGIWTXPOW - SIOCIWFIRST] = { | |
250 | .header_type = IW_HEADER_TYPE_PARAM, | |
251 | }, | |
252 | [SIOCSIWRETRY - SIOCIWFIRST] = { | |
253 | .header_type = IW_HEADER_TYPE_PARAM, | |
254 | }, | |
255 | [SIOCGIWRETRY - SIOCIWFIRST] = { | |
256 | .header_type = IW_HEADER_TYPE_PARAM, | |
257 | }, | |
258 | [SIOCSIWENCODE - SIOCIWFIRST] = { | |
259 | .header_type = IW_HEADER_TYPE_POINT, | |
260 | .token_size = 1, | |
261 | .max_tokens = IW_ENCODING_TOKEN_MAX, | |
262 | .flags = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT, | |
263 | }, | |
264 | [SIOCGIWENCODE - SIOCIWFIRST] = { | |
265 | .header_type = IW_HEADER_TYPE_POINT, | |
266 | .token_size = 1, | |
267 | .max_tokens = IW_ENCODING_TOKEN_MAX, | |
268 | .flags = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT, | |
269 | }, | |
270 | [SIOCSIWPOWER - SIOCIWFIRST] = { | |
271 | .header_type = IW_HEADER_TYPE_PARAM, | |
272 | }, | |
273 | [SIOCGIWPOWER - SIOCIWFIRST] = { | |
274 | .header_type = IW_HEADER_TYPE_PARAM, | |
275 | }, | |
276 | }; | |
277 | static const int standard_ioctl_num = (sizeof(standard_ioctl) / | |
278 | sizeof(struct iw_ioctl_description)); | |
279 | ||
280 | /* | |
281 | * Meta-data about all the additional standard Wireless Extension events | |
282 | * we know about. | |
283 | */ | |
284 | static const struct iw_ioctl_description standard_event[] = { | |
285 | [IWEVTXDROP - IWEVFIRST] = { | |
286 | .header_type = IW_HEADER_TYPE_ADDR, | |
287 | }, | |
288 | [IWEVQUAL - IWEVFIRST] = { | |
289 | .header_type = IW_HEADER_TYPE_QUAL, | |
290 | }, | |
291 | [IWEVCUSTOM - IWEVFIRST] = { | |
292 | .header_type = IW_HEADER_TYPE_POINT, | |
293 | .token_size = 1, | |
294 | .max_tokens = IW_CUSTOM_MAX, | |
295 | }, | |
296 | [IWEVREGISTERED - IWEVFIRST] = { | |
297 | .header_type = IW_HEADER_TYPE_ADDR, | |
298 | }, | |
299 | [IWEVEXPIRED - IWEVFIRST] = { | |
300 | .header_type = IW_HEADER_TYPE_ADDR, | |
301 | }, | |
302 | }; | |
303 | static const int standard_event_num = (sizeof(standard_event) / | |
304 | sizeof(struct iw_ioctl_description)); | |
305 | ||
306 | /* Size (in bytes) of the various private data types */ | |
307 | static const char iw_priv_type_size[] = { | |
308 | 0, /* IW_PRIV_TYPE_NONE */ | |
309 | 1, /* IW_PRIV_TYPE_BYTE */ | |
310 | 1, /* IW_PRIV_TYPE_CHAR */ | |
311 | 0, /* Not defined */ | |
312 | sizeof(__u32), /* IW_PRIV_TYPE_INT */ | |
313 | sizeof(struct iw_freq), /* IW_PRIV_TYPE_FLOAT */ | |
314 | sizeof(struct sockaddr), /* IW_PRIV_TYPE_ADDR */ | |
315 | 0, /* Not defined */ | |
316 | }; | |
317 | ||
318 | /* Size (in bytes) of various events */ | |
319 | static const int event_type_size[] = { | |
320 | IW_EV_LCP_LEN, /* IW_HEADER_TYPE_NULL */ | |
321 | 0, | |
322 | IW_EV_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */ | |
323 | 0, | |
324 | IW_EV_UINT_LEN, /* IW_HEADER_TYPE_UINT */ | |
325 | IW_EV_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */ | |
326 | IW_EV_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */ | |
327 | 0, | |
328 | IW_EV_POINT_LEN, /* Without variable payload */ | |
329 | IW_EV_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */ | |
330 | IW_EV_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */ | |
331 | }; | |
332 | ||
333 | /************************ COMMON SUBROUTINES ************************/ | |
334 | /* | |
335 | * Stuff that may be used in various place or doesn't fit in one | |
336 | * of the section below. | |
337 | */ | |
338 | ||
339 | /* ---------------------------------------------------------------- */ | |
340 | /* | |
341 | * Return the driver handler associated with a specific Wireless Extension. | |
342 | * Called from various place, so make sure it remains efficient. | |
343 | */ | |
344 | static inline iw_handler get_handler(struct net_device *dev, | |
345 | unsigned int cmd) | |
346 | { | |
347 | /* Don't "optimise" the following variable, it will crash */ | |
348 | unsigned int index; /* *MUST* be unsigned */ | |
349 | ||
350 | /* Check if we have some wireless handlers defined */ | |
351 | if(dev->wireless_handlers == NULL) | |
352 | return NULL; | |
353 | ||
354 | /* Try as a standard command */ | |
355 | index = cmd - SIOCIWFIRST; | |
356 | if(index < dev->wireless_handlers->num_standard) | |
357 | return dev->wireless_handlers->standard[index]; | |
358 | ||
359 | /* Try as a private command */ | |
360 | index = cmd - SIOCIWFIRSTPRIV; | |
361 | if(index < dev->wireless_handlers->num_private) | |
362 | return dev->wireless_handlers->private[index]; | |
363 | ||
364 | /* Not found */ | |
365 | return NULL; | |
366 | } | |
367 | ||
368 | /* ---------------------------------------------------------------- */ | |
369 | /* | |
370 | * Get statistics out of the driver | |
371 | */ | |
372 | static inline struct iw_statistics *get_wireless_stats(struct net_device *dev) | |
373 | { | |
374 | /* New location */ | |
375 | if((dev->wireless_handlers != NULL) && | |
376 | (dev->wireless_handlers->get_wireless_stats != NULL)) | |
377 | return dev->wireless_handlers->get_wireless_stats(dev); | |
378 | ||
379 | /* Old location, will be phased out in next WE */ | |
380 | return (dev->get_wireless_stats ? | |
381 | dev->get_wireless_stats(dev) : | |
382 | (struct iw_statistics *) NULL); | |
383 | } | |
384 | ||
385 | /* ---------------------------------------------------------------- */ | |
386 | /* | |
387 | * Call the commit handler in the driver | |
388 | * (if exist and if conditions are right) | |
389 | * | |
390 | * Note : our current commit strategy is currently pretty dumb, | |
391 | * but we will be able to improve on that... | |
392 | * The goal is to try to agreagate as many changes as possible | |
393 | * before doing the commit. Drivers that will define a commit handler | |
394 | * are usually those that need a reset after changing parameters, so | |
395 | * we want to minimise the number of reset. | |
396 | * A cool idea is to use a timer : at each "set" command, we re-set the | |
397 | * timer, when the timer eventually fires, we call the driver. | |
398 | * Hopefully, more on that later. | |
399 | * | |
400 | * Also, I'm waiting to see how many people will complain about the | |
401 | * netif_running(dev) test. I'm open on that one... | |
402 | * Hopefully, the driver will remember to do a commit in "open()" ;-) | |
403 | */ | |
404 | static inline int call_commit_handler(struct net_device * dev) | |
405 | { | |
406 | if((netif_running(dev)) && | |
407 | (dev->wireless_handlers->standard[0] != NULL)) { | |
408 | /* Call the commit handler on the driver */ | |
409 | return dev->wireless_handlers->standard[0](dev, NULL, | |
410 | NULL, NULL); | |
411 | } else | |
412 | return 0; /* Command completed successfully */ | |
413 | } | |
414 | ||
415 | /* ---------------------------------------------------------------- */ | |
416 | /* | |
417 | * Calculate size of private arguments | |
418 | */ | |
419 | static inline int get_priv_size(__u16 args) | |
420 | { | |
421 | int num = args & IW_PRIV_SIZE_MASK; | |
422 | int type = (args & IW_PRIV_TYPE_MASK) >> 12; | |
423 | ||
424 | return num * iw_priv_type_size[type]; | |
425 | } | |
426 | ||
427 | /* ---------------------------------------------------------------- */ | |
428 | /* | |
429 | * Re-calculate the size of private arguments | |
430 | */ | |
431 | static inline int adjust_priv_size(__u16 args, | |
432 | union iwreq_data * wrqu) | |
433 | { | |
434 | int num = wrqu->data.length; | |
435 | int max = args & IW_PRIV_SIZE_MASK; | |
436 | int type = (args & IW_PRIV_TYPE_MASK) >> 12; | |
437 | ||
438 | /* Make sure the driver doesn't goof up */ | |
439 | if (max < num) | |
440 | num = max; | |
441 | ||
442 | return num * iw_priv_type_size[type]; | |
443 | } | |
444 | ||
445 | ||
446 | /******************** /proc/net/wireless SUPPORT ********************/ | |
447 | /* | |
448 | * The /proc/net/wireless file is a human readable user-space interface | |
449 | * exporting various wireless specific statistics from the wireless devices. | |
450 | * This is the most popular part of the Wireless Extensions ;-) | |
451 | * | |
452 | * This interface is a pure clone of /proc/net/dev (in net/core/dev.c). | |
453 | * The content of the file is basically the content of "struct iw_statistics". | |
454 | */ | |
455 | ||
456 | #ifdef CONFIG_PROC_FS | |
457 | ||
458 | /* ---------------------------------------------------------------- */ | |
459 | /* | |
460 | * Print one entry (line) of /proc/net/wireless | |
461 | */ | |
462 | static __inline__ void wireless_seq_printf_stats(struct seq_file *seq, | |
463 | struct net_device *dev) | |
464 | { | |
465 | /* Get stats from the driver */ | |
466 | struct iw_statistics *stats = get_wireless_stats(dev); | |
467 | ||
468 | if (stats) { | |
469 | seq_printf(seq, "%6s: %04x %3d%c %3d%c %3d%c %6d %6d %6d " | |
470 | "%6d %6d %6d\n", | |
471 | dev->name, stats->status, stats->qual.qual, | |
472 | stats->qual.updated & IW_QUAL_QUAL_UPDATED | |
473 | ? '.' : ' ', | |
474 | ((__u8) stats->qual.level), | |
475 | stats->qual.updated & IW_QUAL_LEVEL_UPDATED | |
476 | ? '.' : ' ', | |
477 | ((__u8) stats->qual.noise), | |
478 | stats->qual.updated & IW_QUAL_NOISE_UPDATED | |
479 | ? '.' : ' ', | |
480 | stats->discard.nwid, stats->discard.code, | |
481 | stats->discard.fragment, stats->discard.retries, | |
482 | stats->discard.misc, stats->miss.beacon); | |
483 | stats->qual.updated = 0; | |
484 | } | |
485 | } | |
486 | ||
487 | /* ---------------------------------------------------------------- */ | |
488 | /* | |
489 | * Print info for /proc/net/wireless (print all entries) | |
490 | */ | |
491 | static int wireless_seq_show(struct seq_file *seq, void *v) | |
492 | { | |
493 | if (v == SEQ_START_TOKEN) | |
494 | seq_printf(seq, "Inter-| sta-| Quality | Discarded " | |
495 | "packets | Missed | WE\n" | |
496 | " face | tus | link level noise | nwid " | |
497 | "crypt frag retry misc | beacon | %d\n", | |
498 | WIRELESS_EXT); | |
499 | else | |
500 | wireless_seq_printf_stats(seq, v); | |
501 | return 0; | |
502 | } | |
503 | ||
504 | extern void *dev_seq_start(struct seq_file *seq, loff_t *pos); | |
505 | extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos); | |
506 | extern void dev_seq_stop(struct seq_file *seq, void *v); | |
507 | ||
508 | static struct seq_operations wireless_seq_ops = { | |
509 | .start = dev_seq_start, | |
510 | .next = dev_seq_next, | |
511 | .stop = dev_seq_stop, | |
512 | .show = wireless_seq_show, | |
513 | }; | |
514 | ||
515 | static int wireless_seq_open(struct inode *inode, struct file *file) | |
516 | { | |
517 | return seq_open(file, &wireless_seq_ops); | |
518 | } | |
519 | ||
520 | static struct file_operations wireless_seq_fops = { | |
521 | .owner = THIS_MODULE, | |
522 | .open = wireless_seq_open, | |
523 | .read = seq_read, | |
524 | .llseek = seq_lseek, | |
525 | .release = seq_release, | |
526 | }; | |
527 | ||
528 | int __init wireless_proc_init(void) | |
529 | { | |
530 | if (!proc_net_fops_create("wireless", S_IRUGO, &wireless_seq_fops)) | |
531 | return -ENOMEM; | |
532 | ||
533 | return 0; | |
534 | } | |
535 | #endif /* CONFIG_PROC_FS */ | |
536 | ||
537 | /************************** IOCTL SUPPORT **************************/ | |
538 | /* | |
539 | * The original user space API to configure all those Wireless Extensions | |
540 | * is through IOCTLs. | |
541 | * In there, we check if we need to call the new driver API (iw_handler) | |
542 | * or just call the driver ioctl handler. | |
543 | */ | |
544 | ||
545 | /* ---------------------------------------------------------------- */ | |
546 | /* | |
547 | * Allow programatic access to /proc/net/wireless even if /proc | |
548 | * doesn't exist... Also more efficient... | |
549 | */ | |
550 | static inline int dev_iwstats(struct net_device *dev, struct ifreq *ifr) | |
551 | { | |
552 | /* Get stats from the driver */ | |
553 | struct iw_statistics *stats; | |
554 | ||
555 | stats = get_wireless_stats(dev); | |
556 | if (stats != (struct iw_statistics *) NULL) { | |
557 | struct iwreq * wrq = (struct iwreq *)ifr; | |
558 | ||
559 | /* Copy statistics to the user buffer */ | |
560 | if(copy_to_user(wrq->u.data.pointer, stats, | |
561 | sizeof(struct iw_statistics))) | |
562 | return -EFAULT; | |
563 | ||
564 | /* Check if we need to clear the update flag */ | |
565 | if(wrq->u.data.flags != 0) | |
566 | stats->qual.updated = 0; | |
567 | return 0; | |
568 | } else | |
569 | return -EOPNOTSUPP; | |
570 | } | |
571 | ||
572 | /* ---------------------------------------------------------------- */ | |
573 | /* | |
574 | * Export the driver private handler definition | |
575 | * They will be picked up by tools like iwpriv... | |
576 | */ | |
577 | static inline int ioctl_export_private(struct net_device * dev, | |
578 | struct ifreq * ifr) | |
579 | { | |
580 | struct iwreq * iwr = (struct iwreq *) ifr; | |
581 | ||
582 | /* Check if the driver has something to export */ | |
583 | if((dev->wireless_handlers->num_private_args == 0) || | |
584 | (dev->wireless_handlers->private_args == NULL)) | |
585 | return -EOPNOTSUPP; | |
586 | ||
587 | /* Check NULL pointer */ | |
588 | if(iwr->u.data.pointer == NULL) | |
589 | return -EFAULT; | |
590 | ||
591 | /* Check if there is enough buffer up there */ | |
592 | if(iwr->u.data.length < dev->wireless_handlers->num_private_args) { | |
593 | /* User space can't know in advance how large the buffer | |
594 | * needs to be. Give it a hint, so that we can support | |
595 | * any size buffer we want somewhat efficiently... */ | |
596 | iwr->u.data.length = dev->wireless_handlers->num_private_args; | |
597 | return -E2BIG; | |
598 | } | |
599 | ||
600 | /* Set the number of available ioctls. */ | |
601 | iwr->u.data.length = dev->wireless_handlers->num_private_args; | |
602 | ||
603 | /* Copy structure to the user buffer. */ | |
604 | if (copy_to_user(iwr->u.data.pointer, | |
605 | dev->wireless_handlers->private_args, | |
606 | sizeof(struct iw_priv_args) * iwr->u.data.length)) | |
607 | return -EFAULT; | |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
612 | /* ---------------------------------------------------------------- */ | |
613 | /* | |
614 | * Wrapper to call a standard Wireless Extension handler. | |
615 | * We do various checks and also take care of moving data between | |
616 | * user space and kernel space. | |
617 | */ | |
618 | static inline int ioctl_standard_call(struct net_device * dev, | |
619 | struct ifreq * ifr, | |
620 | unsigned int cmd, | |
621 | iw_handler handler) | |
622 | { | |
623 | struct iwreq * iwr = (struct iwreq *) ifr; | |
624 | const struct iw_ioctl_description * descr; | |
625 | struct iw_request_info info; | |
626 | int ret = -EINVAL; | |
627 | ||
628 | /* Get the description of the IOCTL */ | |
629 | if((cmd - SIOCIWFIRST) >= standard_ioctl_num) | |
630 | return -EOPNOTSUPP; | |
631 | descr = &(standard_ioctl[cmd - SIOCIWFIRST]); | |
632 | ||
633 | #ifdef WE_IOCTL_DEBUG | |
634 | printk(KERN_DEBUG "%s (WE) : Found standard handler for 0x%04X\n", | |
635 | ifr->ifr_name, cmd); | |
636 | printk(KERN_DEBUG "%s (WE) : Header type : %d, Token type : %d, size : %d, token : %d\n", dev->name, descr->header_type, descr->token_type, descr->token_size, descr->max_tokens); | |
637 | #endif /* WE_IOCTL_DEBUG */ | |
638 | ||
639 | /* Prepare the call */ | |
640 | info.cmd = cmd; | |
641 | info.flags = 0; | |
642 | ||
643 | /* Check if we have a pointer to user space data or not */ | |
644 | if(descr->header_type != IW_HEADER_TYPE_POINT) { | |
645 | ||
646 | /* No extra arguments. Trivial to handle */ | |
647 | ret = handler(dev, &info, &(iwr->u), NULL); | |
648 | ||
649 | #ifdef WE_SET_EVENT | |
650 | /* Generate an event to notify listeners of the change */ | |
651 | if((descr->flags & IW_DESCR_FLAG_EVENT) && | |
652 | ((ret == 0) || (ret == -EIWCOMMIT))) | |
653 | wireless_send_event(dev, cmd, &(iwr->u), NULL); | |
654 | #endif /* WE_SET_EVENT */ | |
655 | } else { | |
656 | char * extra; | |
657 | int extra_size; | |
658 | int user_length = 0; | |
659 | int err; | |
660 | ||
661 | /* Calculate space needed by arguments. Always allocate | |
662 | * for max space. Easier, and won't last long... */ | |
663 | extra_size = descr->max_tokens * descr->token_size; | |
664 | ||
665 | /* Check what user space is giving us */ | |
666 | if(IW_IS_SET(cmd)) { | |
667 | /* Check NULL pointer */ | |
668 | if((iwr->u.data.pointer == NULL) && | |
669 | (iwr->u.data.length != 0)) | |
670 | return -EFAULT; | |
671 | /* Check if number of token fits within bounds */ | |
672 | if(iwr->u.data.length > descr->max_tokens) | |
673 | return -E2BIG; | |
674 | if(iwr->u.data.length < descr->min_tokens) | |
675 | return -EINVAL; | |
676 | } else { | |
677 | /* Check NULL pointer */ | |
678 | if(iwr->u.data.pointer == NULL) | |
679 | return -EFAULT; | |
680 | /* Save user space buffer size for checking */ | |
681 | user_length = iwr->u.data.length; | |
682 | ||
683 | /* Don't check if user_length > max to allow forward | |
684 | * compatibility. The test user_length < min is | |
685 | * implied by the test at the end. */ | |
686 | ||
687 | /* Support for very large requests */ | |
688 | if((descr->flags & IW_DESCR_FLAG_NOMAX) && | |
689 | (user_length > descr->max_tokens)) { | |
690 | /* Allow userspace to GET more than max so | |
691 | * we can support any size GET requests. | |
692 | * There is still a limit : -ENOMEM. */ | |
693 | extra_size = user_length * descr->token_size; | |
694 | /* Note : user_length is originally a __u16, | |
695 | * and token_size is controlled by us, | |
696 | * so extra_size won't get negative and | |
697 | * won't overflow... */ | |
698 | } | |
699 | } | |
700 | ||
701 | #ifdef WE_IOCTL_DEBUG | |
702 | printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n", | |
703 | dev->name, extra_size); | |
704 | #endif /* WE_IOCTL_DEBUG */ | |
705 | ||
706 | /* Create the kernel buffer */ | |
707 | extra = kmalloc(extra_size, GFP_KERNEL); | |
708 | if (extra == NULL) { | |
709 | return -ENOMEM; | |
710 | } | |
711 | ||
712 | /* If it is a SET, get all the extra data in here */ | |
713 | if(IW_IS_SET(cmd) && (iwr->u.data.length != 0)) { | |
714 | err = copy_from_user(extra, iwr->u.data.pointer, | |
715 | iwr->u.data.length * | |
716 | descr->token_size); | |
717 | if (err) { | |
718 | kfree(extra); | |
719 | return -EFAULT; | |
720 | } | |
721 | #ifdef WE_IOCTL_DEBUG | |
722 | printk(KERN_DEBUG "%s (WE) : Got %d bytes\n", | |
723 | dev->name, | |
724 | iwr->u.data.length * descr->token_size); | |
725 | #endif /* WE_IOCTL_DEBUG */ | |
726 | } | |
727 | ||
728 | /* Call the handler */ | |
729 | ret = handler(dev, &info, &(iwr->u), extra); | |
730 | ||
731 | /* If we have something to return to the user */ | |
732 | if (!ret && IW_IS_GET(cmd)) { | |
733 | /* Check if there is enough buffer up there */ | |
734 | if(user_length < iwr->u.data.length) { | |
735 | kfree(extra); | |
736 | return -E2BIG; | |
737 | } | |
738 | ||
739 | err = copy_to_user(iwr->u.data.pointer, extra, | |
740 | iwr->u.data.length * | |
741 | descr->token_size); | |
742 | if (err) | |
743 | ret = -EFAULT; | |
744 | #ifdef WE_IOCTL_DEBUG | |
745 | printk(KERN_DEBUG "%s (WE) : Wrote %d bytes\n", | |
746 | dev->name, | |
747 | iwr->u.data.length * descr->token_size); | |
748 | #endif /* WE_IOCTL_DEBUG */ | |
749 | } | |
750 | ||
751 | #ifdef WE_SET_EVENT | |
752 | /* Generate an event to notify listeners of the change */ | |
753 | if((descr->flags & IW_DESCR_FLAG_EVENT) && | |
754 | ((ret == 0) || (ret == -EIWCOMMIT))) { | |
755 | if(descr->flags & IW_DESCR_FLAG_RESTRICT) | |
756 | /* If the event is restricted, don't | |
757 | * export the payload */ | |
758 | wireless_send_event(dev, cmd, &(iwr->u), NULL); | |
759 | else | |
760 | wireless_send_event(dev, cmd, &(iwr->u), | |
761 | extra); | |
762 | } | |
763 | #endif /* WE_SET_EVENT */ | |
764 | ||
765 | /* Cleanup - I told you it wasn't that long ;-) */ | |
766 | kfree(extra); | |
767 | } | |
768 | ||
769 | /* Call commit handler if needed and defined */ | |
770 | if(ret == -EIWCOMMIT) | |
771 | ret = call_commit_handler(dev); | |
772 | ||
773 | /* Here, we will generate the appropriate event if needed */ | |
774 | ||
775 | return ret; | |
776 | } | |
777 | ||
778 | /* ---------------------------------------------------------------- */ | |
779 | /* | |
780 | * Wrapper to call a private Wireless Extension handler. | |
781 | * We do various checks and also take care of moving data between | |
782 | * user space and kernel space. | |
783 | * It's not as nice and slimline as the standard wrapper. The cause | |
784 | * is struct iw_priv_args, which was not really designed for the | |
785 | * job we are going here. | |
786 | * | |
787 | * IMPORTANT : This function prevent to set and get data on the same | |
788 | * IOCTL and enforce the SET/GET convention. Not doing it would be | |
789 | * far too hairy... | |
790 | * If you need to set and get data at the same time, please don't use | |
791 | * a iw_handler but process it in your ioctl handler (i.e. use the | |
792 | * old driver API). | |
793 | */ | |
794 | static inline int ioctl_private_call(struct net_device * dev, | |
795 | struct ifreq * ifr, | |
796 | unsigned int cmd, | |
797 | iw_handler handler) | |
798 | { | |
799 | struct iwreq * iwr = (struct iwreq *) ifr; | |
800 | const struct iw_priv_args * descr = NULL; | |
801 | struct iw_request_info info; | |
802 | int extra_size = 0; | |
803 | int i; | |
804 | int ret = -EINVAL; | |
805 | ||
806 | /* Get the description of the IOCTL */ | |
807 | for(i = 0; i < dev->wireless_handlers->num_private_args; i++) | |
808 | if(cmd == dev->wireless_handlers->private_args[i].cmd) { | |
809 | descr = &(dev->wireless_handlers->private_args[i]); | |
810 | break; | |
811 | } | |
812 | ||
813 | #ifdef WE_IOCTL_DEBUG | |
814 | printk(KERN_DEBUG "%s (WE) : Found private handler for 0x%04X\n", | |
815 | ifr->ifr_name, cmd); | |
816 | if(descr) { | |
817 | printk(KERN_DEBUG "%s (WE) : Name %s, set %X, get %X\n", | |
818 | dev->name, descr->name, | |
819 | descr->set_args, descr->get_args); | |
820 | } | |
821 | #endif /* WE_IOCTL_DEBUG */ | |
822 | ||
823 | /* Compute the size of the set/get arguments */ | |
824 | if(descr != NULL) { | |
825 | if(IW_IS_SET(cmd)) { | |
826 | int offset = 0; /* For sub-ioctls */ | |
827 | /* Check for sub-ioctl handler */ | |
828 | if(descr->name[0] == '\0') | |
829 | /* Reserve one int for sub-ioctl index */ | |
830 | offset = sizeof(__u32); | |
831 | ||
832 | /* Size of set arguments */ | |
833 | extra_size = get_priv_size(descr->set_args); | |
834 | ||
835 | /* Does it fits in iwr ? */ | |
836 | if((descr->set_args & IW_PRIV_SIZE_FIXED) && | |
837 | ((extra_size + offset) <= IFNAMSIZ)) | |
838 | extra_size = 0; | |
839 | } else { | |
840 | /* Size of get arguments */ | |
841 | extra_size = get_priv_size(descr->get_args); | |
842 | ||
843 | /* Does it fits in iwr ? */ | |
844 | if((descr->get_args & IW_PRIV_SIZE_FIXED) && | |
845 | (extra_size <= IFNAMSIZ)) | |
846 | extra_size = 0; | |
847 | } | |
848 | } | |
849 | ||
850 | /* Prepare the call */ | |
851 | info.cmd = cmd; | |
852 | info.flags = 0; | |
853 | ||
854 | /* Check if we have a pointer to user space data or not. */ | |
855 | if(extra_size == 0) { | |
856 | /* No extra arguments. Trivial to handle */ | |
857 | ret = handler(dev, &info, &(iwr->u), (char *) &(iwr->u)); | |
858 | } else { | |
859 | char * extra; | |
860 | int err; | |
861 | ||
862 | /* Check what user space is giving us */ | |
863 | if(IW_IS_SET(cmd)) { | |
864 | /* Check NULL pointer */ | |
865 | if((iwr->u.data.pointer == NULL) && | |
866 | (iwr->u.data.length != 0)) | |
867 | return -EFAULT; | |
868 | ||
869 | /* Does it fits within bounds ? */ | |
870 | if(iwr->u.data.length > (descr->set_args & | |
871 | IW_PRIV_SIZE_MASK)) | |
872 | return -E2BIG; | |
873 | } else { | |
874 | /* Check NULL pointer */ | |
875 | if(iwr->u.data.pointer == NULL) | |
876 | return -EFAULT; | |
877 | } | |
878 | ||
879 | #ifdef WE_IOCTL_DEBUG | |
880 | printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n", | |
881 | dev->name, extra_size); | |
882 | #endif /* WE_IOCTL_DEBUG */ | |
883 | ||
884 | /* Always allocate for max space. Easier, and won't last | |
885 | * long... */ | |
886 | extra = kmalloc(extra_size, GFP_KERNEL); | |
887 | if (extra == NULL) { | |
888 | return -ENOMEM; | |
889 | } | |
890 | ||
891 | /* If it is a SET, get all the extra data in here */ | |
892 | if(IW_IS_SET(cmd) && (iwr->u.data.length != 0)) { | |
893 | err = copy_from_user(extra, iwr->u.data.pointer, | |
894 | extra_size); | |
895 | if (err) { | |
896 | kfree(extra); | |
897 | return -EFAULT; | |
898 | } | |
899 | #ifdef WE_IOCTL_DEBUG | |
900 | printk(KERN_DEBUG "%s (WE) : Got %d elem\n", | |
901 | dev->name, iwr->u.data.length); | |
902 | #endif /* WE_IOCTL_DEBUG */ | |
903 | } | |
904 | ||
905 | /* Call the handler */ | |
906 | ret = handler(dev, &info, &(iwr->u), extra); | |
907 | ||
908 | /* If we have something to return to the user */ | |
909 | if (!ret && IW_IS_GET(cmd)) { | |
910 | ||
911 | /* Adjust for the actual length if it's variable, | |
912 | * avoid leaking kernel bits outside. */ | |
913 | if (!(descr->get_args & IW_PRIV_SIZE_FIXED)) { | |
914 | extra_size = adjust_priv_size(descr->get_args, | |
915 | &(iwr->u)); | |
916 | } | |
917 | ||
918 | err = copy_to_user(iwr->u.data.pointer, extra, | |
919 | extra_size); | |
920 | if (err) | |
921 | ret = -EFAULT; | |
922 | #ifdef WE_IOCTL_DEBUG | |
923 | printk(KERN_DEBUG "%s (WE) : Wrote %d elem\n", | |
924 | dev->name, iwr->u.data.length); | |
925 | #endif /* WE_IOCTL_DEBUG */ | |
926 | } | |
927 | ||
928 | /* Cleanup - I told you it wasn't that long ;-) */ | |
929 | kfree(extra); | |
930 | } | |
931 | ||
932 | ||
933 | /* Call commit handler if needed and defined */ | |
934 | if(ret == -EIWCOMMIT) | |
935 | ret = call_commit_handler(dev); | |
936 | ||
937 | return ret; | |
938 | } | |
939 | ||
940 | /* ---------------------------------------------------------------- */ | |
941 | /* | |
942 | * Main IOCTl dispatcher. Called from the main networking code | |
943 | * (dev_ioctl() in net/core/dev.c). | |
944 | * Check the type of IOCTL and call the appropriate wrapper... | |
945 | */ | |
946 | int wireless_process_ioctl(struct ifreq *ifr, unsigned int cmd) | |
947 | { | |
948 | struct net_device *dev; | |
949 | iw_handler handler; | |
950 | ||
951 | /* Permissions are already checked in dev_ioctl() before calling us. | |
952 | * The copy_to/from_user() of ifr is also dealt with in there */ | |
953 | ||
954 | /* Make sure the device exist */ | |
955 | if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL) | |
956 | return -ENODEV; | |
957 | ||
958 | /* A bunch of special cases, then the generic case... | |
959 | * Note that 'cmd' is already filtered in dev_ioctl() with | |
960 | * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */ | |
961 | switch(cmd) | |
962 | { | |
963 | case SIOCGIWSTATS: | |
964 | /* Get Wireless Stats */ | |
965 | return dev_iwstats(dev, ifr); | |
966 | ||
967 | case SIOCGIWPRIV: | |
968 | /* Check if we have some wireless handlers defined */ | |
969 | if(dev->wireless_handlers != NULL) { | |
970 | /* We export to user space the definition of | |
971 | * the private handler ourselves */ | |
972 | return ioctl_export_private(dev, ifr); | |
973 | } | |
974 | // ## Fall-through for old API ## | |
975 | default: | |
976 | /* Generic IOCTL */ | |
977 | /* Basic check */ | |
978 | if (!netif_device_present(dev)) | |
979 | return -ENODEV; | |
980 | /* New driver API : try to find the handler */ | |
981 | handler = get_handler(dev, cmd); | |
982 | if(handler != NULL) { | |
983 | /* Standard and private are not the same */ | |
984 | if(cmd < SIOCIWFIRSTPRIV) | |
985 | return ioctl_standard_call(dev, | |
986 | ifr, | |
987 | cmd, | |
988 | handler); | |
989 | else | |
990 | return ioctl_private_call(dev, | |
991 | ifr, | |
992 | cmd, | |
993 | handler); | |
994 | } | |
995 | /* Old driver API : call driver ioctl handler */ | |
996 | if (dev->do_ioctl) { | |
997 | return dev->do_ioctl(dev, ifr, cmd); | |
998 | } | |
999 | return -EOPNOTSUPP; | |
1000 | } | |
1001 | /* Not reached */ | |
1002 | return -EINVAL; | |
1003 | } | |
1004 | ||
1005 | /************************* EVENT PROCESSING *************************/ | |
1006 | /* | |
1007 | * Process events generated by the wireless layer or the driver. | |
1008 | * Most often, the event will be propagated through rtnetlink | |
1009 | */ | |
1010 | ||
1011 | #ifdef WE_EVENT_NETLINK | |
1012 | /* "rtnl" is defined in net/core/rtnetlink.c, but we need it here. | |
1013 | * It is declared in <linux/rtnetlink.h> */ | |
1014 | ||
1015 | /* ---------------------------------------------------------------- */ | |
1016 | /* | |
1017 | * Fill a rtnetlink message with our event data. | |
1018 | * Note that we propage only the specified event and don't dump the | |
1019 | * current wireless config. Dumping the wireless config is far too | |
1020 | * expensive (for each parameter, the driver need to query the hardware). | |
1021 | */ | |
1022 | static inline int rtnetlink_fill_iwinfo(struct sk_buff * skb, | |
1023 | struct net_device * dev, | |
1024 | int type, | |
1025 | char * event, | |
1026 | int event_len) | |
1027 | { | |
1028 | struct ifinfomsg *r; | |
1029 | struct nlmsghdr *nlh; | |
1030 | unsigned char *b = skb->tail; | |
1031 | ||
1032 | nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(*r)); | |
1033 | r = NLMSG_DATA(nlh); | |
1034 | r->ifi_family = AF_UNSPEC; | |
1035 | r->ifi_type = dev->type; | |
1036 | r->ifi_index = dev->ifindex; | |
1037 | r->ifi_flags = dev->flags; | |
1038 | r->ifi_change = 0; /* Wireless changes don't affect those flags */ | |
1039 | ||
1040 | /* Add the wireless events in the netlink packet */ | |
1041 | RTA_PUT(skb, IFLA_WIRELESS, | |
1042 | event_len, event); | |
1043 | ||
1044 | nlh->nlmsg_len = skb->tail - b; | |
1045 | return skb->len; | |
1046 | ||
1047 | nlmsg_failure: | |
1048 | rtattr_failure: | |
1049 | skb_trim(skb, b - skb->data); | |
1050 | return -1; | |
1051 | } | |
1052 | ||
1053 | /* ---------------------------------------------------------------- */ | |
1054 | /* | |
1055 | * Create and broadcast and send it on the standard rtnetlink socket | |
1056 | * This is a pure clone rtmsg_ifinfo() in net/core/rtnetlink.c | |
1057 | * Andrzej Krzysztofowicz mandated that I used a IFLA_XXX field | |
1058 | * within a RTM_NEWLINK event. | |
1059 | */ | |
1060 | static inline void rtmsg_iwinfo(struct net_device * dev, | |
1061 | char * event, | |
1062 | int event_len) | |
1063 | { | |
1064 | struct sk_buff *skb; | |
1065 | int size = NLMSG_GOODSIZE; | |
1066 | ||
1067 | skb = alloc_skb(size, GFP_ATOMIC); | |
1068 | if (!skb) | |
1069 | return; | |
1070 | ||
1071 | if (rtnetlink_fill_iwinfo(skb, dev, RTM_NEWLINK, | |
1072 | event, event_len) < 0) { | |
1073 | kfree_skb(skb); | |
1074 | return; | |
1075 | } | |
1076 | NETLINK_CB(skb).dst_groups = RTMGRP_LINK; | |
1077 | netlink_broadcast(rtnl, skb, 0, RTMGRP_LINK, GFP_ATOMIC); | |
1078 | } | |
1079 | #endif /* WE_EVENT_NETLINK */ | |
1080 | ||
1081 | /* ---------------------------------------------------------------- */ | |
1082 | /* | |
1083 | * Main event dispatcher. Called from other parts and drivers. | |
1084 | * Send the event on the appropriate channels. | |
1085 | * May be called from interrupt context. | |
1086 | */ | |
1087 | void wireless_send_event(struct net_device * dev, | |
1088 | unsigned int cmd, | |
1089 | union iwreq_data * wrqu, | |
1090 | char * extra) | |
1091 | { | |
1092 | const struct iw_ioctl_description * descr = NULL; | |
1093 | int extra_len = 0; | |
1094 | struct iw_event *event; /* Mallocated whole event */ | |
1095 | int event_len; /* Its size */ | |
1096 | int hdr_len; /* Size of the event header */ | |
1097 | /* Don't "optimise" the following variable, it will crash */ | |
1098 | unsigned cmd_index; /* *MUST* be unsigned */ | |
1099 | ||
1100 | /* Get the description of the IOCTL */ | |
1101 | if(cmd <= SIOCIWLAST) { | |
1102 | cmd_index = cmd - SIOCIWFIRST; | |
1103 | if(cmd_index < standard_ioctl_num) | |
1104 | descr = &(standard_ioctl[cmd_index]); | |
1105 | } else { | |
1106 | cmd_index = cmd - IWEVFIRST; | |
1107 | if(cmd_index < standard_event_num) | |
1108 | descr = &(standard_event[cmd_index]); | |
1109 | } | |
1110 | /* Don't accept unknown events */ | |
1111 | if(descr == NULL) { | |
1112 | /* Note : we don't return an error to the driver, because | |
1113 | * the driver would not know what to do about it. It can't | |
1114 | * return an error to the user, because the event is not | |
1115 | * initiated by a user request. | |
1116 | * The best the driver could do is to log an error message. | |
1117 | * We will do it ourselves instead... | |
1118 | */ | |
1119 | printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n", | |
1120 | dev->name, cmd); | |
1121 | return; | |
1122 | } | |
1123 | #ifdef WE_EVENT_DEBUG | |
1124 | printk(KERN_DEBUG "%s (WE) : Got event 0x%04X\n", | |
1125 | dev->name, cmd); | |
1126 | printk(KERN_DEBUG "%s (WE) : Header type : %d, Token type : %d, size : %d, token : %d\n", dev->name, descr->header_type, descr->token_type, descr->token_size, descr->max_tokens); | |
1127 | #endif /* WE_EVENT_DEBUG */ | |
1128 | ||
1129 | /* Check extra parameters and set extra_len */ | |
1130 | if(descr->header_type == IW_HEADER_TYPE_POINT) { | |
1131 | /* Check if number of token fits within bounds */ | |
1132 | if(wrqu->data.length > descr->max_tokens) { | |
1133 | printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length); | |
1134 | return; | |
1135 | } | |
1136 | if(wrqu->data.length < descr->min_tokens) { | |
1137 | printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, wrqu->data.length); | |
1138 | return; | |
1139 | } | |
1140 | /* Calculate extra_len - extra is NULL for restricted events */ | |
1141 | if(extra != NULL) | |
1142 | extra_len = wrqu->data.length * descr->token_size; | |
1143 | #ifdef WE_EVENT_DEBUG | |
1144 | printk(KERN_DEBUG "%s (WE) : Event 0x%04X, tokens %d, extra_len %d\n", dev->name, cmd, wrqu->data.length, extra_len); | |
1145 | #endif /* WE_EVENT_DEBUG */ | |
1146 | } | |
1147 | ||
1148 | /* Total length of the event */ | |
1149 | hdr_len = event_type_size[descr->header_type]; | |
1150 | event_len = hdr_len + extra_len; | |
1151 | ||
1152 | #ifdef WE_EVENT_DEBUG | |
1153 | printk(KERN_DEBUG "%s (WE) : Event 0x%04X, hdr_len %d, event_len %d\n", dev->name, cmd, hdr_len, event_len); | |
1154 | #endif /* WE_EVENT_DEBUG */ | |
1155 | ||
1156 | /* Create temporary buffer to hold the event */ | |
1157 | event = kmalloc(event_len, GFP_ATOMIC); | |
1158 | if(event == NULL) | |
1159 | return; | |
1160 | ||
1161 | /* Fill event */ | |
1162 | event->len = event_len; | |
1163 | event->cmd = cmd; | |
1164 | memcpy(&event->u, wrqu, hdr_len - IW_EV_LCP_LEN); | |
1165 | if(extra != NULL) | |
1166 | memcpy(((char *) event) + hdr_len, extra, extra_len); | |
1167 | ||
1168 | #ifdef WE_EVENT_NETLINK | |
1169 | /* rtnetlink event channel */ | |
1170 | rtmsg_iwinfo(dev, (char *) event, event_len); | |
1171 | #endif /* WE_EVENT_NETLINK */ | |
1172 | ||
1173 | /* Cleanup */ | |
1174 | kfree(event); | |
1175 | ||
1176 | return; /* Always success, I guess ;-) */ | |
1177 | } | |
1178 | ||
1179 | /********************** ENHANCED IWSPY SUPPORT **********************/ | |
1180 | /* | |
1181 | * In the old days, the driver was handling spy support all by itself. | |
1182 | * Now, the driver can delegate this task to Wireless Extensions. | |
1183 | * It needs to use those standard spy iw_handler in struct iw_handler_def, | |
1184 | * push data to us via wireless_spy_update() and include struct iw_spy_data | |
1185 | * in its private part (and advertise it in iw_handler_def->spy_offset). | |
1186 | * One of the main advantage of centralising spy support here is that | |
1187 | * it becomes much easier to improve and extend it without having to touch | |
1188 | * the drivers. One example is the addition of the Spy-Threshold events. | |
1189 | */ | |
1190 | ||
1191 | /* ---------------------------------------------------------------- */ | |
1192 | /* | |
1193 | * Return the pointer to the spy data in the driver. | |
1194 | * Because this is called on the Rx path via wireless_spy_update(), | |
1195 | * we want it to be efficient... | |
1196 | */ | |
1197 | static inline struct iw_spy_data * get_spydata(struct net_device *dev) | |
1198 | { | |
1199 | /* This is the new way */ | |
1200 | if(dev->wireless_data) | |
1201 | return(dev->wireless_data->spy_data); | |
1202 | ||
1203 | /* This is the old way. Doesn't work for multi-headed drivers. | |
1204 | * It will be removed in the next version of WE. */ | |
1205 | return (dev->priv + dev->wireless_handlers->spy_offset); | |
1206 | } | |
1207 | ||
1208 | /*------------------------------------------------------------------*/ | |
1209 | /* | |
1210 | * Standard Wireless Handler : set Spy List | |
1211 | */ | |
1212 | int iw_handler_set_spy(struct net_device * dev, | |
1213 | struct iw_request_info * info, | |
1214 | union iwreq_data * wrqu, | |
1215 | char * extra) | |
1216 | { | |
1217 | struct iw_spy_data * spydata = get_spydata(dev); | |
1218 | struct sockaddr * address = (struct sockaddr *) extra; | |
1219 | ||
1220 | if(!dev->wireless_data) | |
1221 | /* Help user know that driver needs updating */ | |
1222 | printk(KERN_DEBUG "%s (WE) : Driver using old/buggy spy support, please fix driver !\n", | |
1223 | dev->name); | |
1224 | /* Make sure driver is not buggy or using the old API */ | |
1225 | if(!spydata) | |
1226 | return -EOPNOTSUPP; | |
1227 | ||
1228 | /* Disable spy collection while we copy the addresses. | |
1229 | * While we copy addresses, any call to wireless_spy_update() | |
1230 | * will NOP. This is OK, as anyway the addresses are changing. */ | |
1231 | spydata->spy_number = 0; | |
1232 | ||
1233 | /* We want to operate without locking, because wireless_spy_update() | |
1234 | * most likely will happen in the interrupt handler, and therefore | |
1235 | * have its own locking constraints and needs performance. | |
1236 | * The rtnl_lock() make sure we don't race with the other iw_handlers. | |
1237 | * This make sure wireless_spy_update() "see" that the spy list | |
1238 | * is temporarily disabled. */ | |
1239 | wmb(); | |
1240 | ||
1241 | /* Are there are addresses to copy? */ | |
1242 | if(wrqu->data.length > 0) { | |
1243 | int i; | |
1244 | ||
1245 | /* Copy addresses */ | |
1246 | for(i = 0; i < wrqu->data.length; i++) | |
1247 | memcpy(spydata->spy_address[i], address[i].sa_data, | |
1248 | ETH_ALEN); | |
1249 | /* Reset stats */ | |
1250 | memset(spydata->spy_stat, 0, | |
1251 | sizeof(struct iw_quality) * IW_MAX_SPY); | |
1252 | ||
1253 | #ifdef WE_SPY_DEBUG | |
1254 | printk(KERN_DEBUG "iw_handler_set_spy() : offset %ld, spydata %p, num %d\n", dev->wireless_handlers->spy_offset, spydata, wrqu->data.length); | |
1255 | for (i = 0; i < wrqu->data.length; i++) | |
1256 | printk(KERN_DEBUG | |
1257 | "%02X:%02X:%02X:%02X:%02X:%02X \n", | |
1258 | spydata->spy_address[i][0], | |
1259 | spydata->spy_address[i][1], | |
1260 | spydata->spy_address[i][2], | |
1261 | spydata->spy_address[i][3], | |
1262 | spydata->spy_address[i][4], | |
1263 | spydata->spy_address[i][5]); | |
1264 | #endif /* WE_SPY_DEBUG */ | |
1265 | } | |
1266 | ||
1267 | /* Make sure above is updated before re-enabling */ | |
1268 | wmb(); | |
1269 | ||
1270 | /* Enable addresses */ | |
1271 | spydata->spy_number = wrqu->data.length; | |
1272 | ||
1273 | return 0; | |
1274 | } | |
1275 | ||
1276 | /*------------------------------------------------------------------*/ | |
1277 | /* | |
1278 | * Standard Wireless Handler : get Spy List | |
1279 | */ | |
1280 | int iw_handler_get_spy(struct net_device * dev, | |
1281 | struct iw_request_info * info, | |
1282 | union iwreq_data * wrqu, | |
1283 | char * extra) | |
1284 | { | |
1285 | struct iw_spy_data * spydata = get_spydata(dev); | |
1286 | struct sockaddr * address = (struct sockaddr *) extra; | |
1287 | int i; | |
1288 | ||
1289 | /* Make sure driver is not buggy or using the old API */ | |
1290 | if(!spydata) | |
1291 | return -EOPNOTSUPP; | |
1292 | ||
1293 | wrqu->data.length = spydata->spy_number; | |
1294 | ||
1295 | /* Copy addresses. */ | |
1296 | for(i = 0; i < spydata->spy_number; i++) { | |
1297 | memcpy(address[i].sa_data, spydata->spy_address[i], ETH_ALEN); | |
1298 | address[i].sa_family = AF_UNIX; | |
1299 | } | |
1300 | /* Copy stats to the user buffer (just after). */ | |
1301 | if(spydata->spy_number > 0) | |
1302 | memcpy(extra + (sizeof(struct sockaddr) *spydata->spy_number), | |
1303 | spydata->spy_stat, | |
1304 | sizeof(struct iw_quality) * spydata->spy_number); | |
1305 | /* Reset updated flags. */ | |
1306 | for(i = 0; i < spydata->spy_number; i++) | |
1307 | spydata->spy_stat[i].updated = 0; | |
1308 | return 0; | |
1309 | } | |
1310 | ||
1311 | /*------------------------------------------------------------------*/ | |
1312 | /* | |
1313 | * Standard Wireless Handler : set spy threshold | |
1314 | */ | |
1315 | int iw_handler_set_thrspy(struct net_device * dev, | |
1316 | struct iw_request_info *info, | |
1317 | union iwreq_data * wrqu, | |
1318 | char * extra) | |
1319 | { | |
1320 | struct iw_spy_data * spydata = get_spydata(dev); | |
1321 | struct iw_thrspy * threshold = (struct iw_thrspy *) extra; | |
1322 | ||
1323 | /* Make sure driver is not buggy or using the old API */ | |
1324 | if(!spydata) | |
1325 | return -EOPNOTSUPP; | |
1326 | ||
1327 | /* Just do it */ | |
1328 | memcpy(&(spydata->spy_thr_low), &(threshold->low), | |
1329 | 2 * sizeof(struct iw_quality)); | |
1330 | ||
1331 | /* Clear flag */ | |
1332 | memset(spydata->spy_thr_under, '\0', sizeof(spydata->spy_thr_under)); | |
1333 | ||
1334 | #ifdef WE_SPY_DEBUG | |
1335 | printk(KERN_DEBUG "iw_handler_set_thrspy() : low %d ; high %d\n", spydata->spy_thr_low.level, spydata->spy_thr_high.level); | |
1336 | #endif /* WE_SPY_DEBUG */ | |
1337 | ||
1338 | return 0; | |
1339 | } | |
1340 | ||
1341 | /*------------------------------------------------------------------*/ | |
1342 | /* | |
1343 | * Standard Wireless Handler : get spy threshold | |
1344 | */ | |
1345 | int iw_handler_get_thrspy(struct net_device * dev, | |
1346 | struct iw_request_info *info, | |
1347 | union iwreq_data * wrqu, | |
1348 | char * extra) | |
1349 | { | |
1350 | struct iw_spy_data * spydata = get_spydata(dev); | |
1351 | struct iw_thrspy * threshold = (struct iw_thrspy *) extra; | |
1352 | ||
1353 | /* Make sure driver is not buggy or using the old API */ | |
1354 | if(!spydata) | |
1355 | return -EOPNOTSUPP; | |
1356 | ||
1357 | /* Just do it */ | |
1358 | memcpy(&(threshold->low), &(spydata->spy_thr_low), | |
1359 | 2 * sizeof(struct iw_quality)); | |
1360 | ||
1361 | return 0; | |
1362 | } | |
1363 | ||
1364 | /*------------------------------------------------------------------*/ | |
1365 | /* | |
1366 | * Prepare and send a Spy Threshold event | |
1367 | */ | |
1368 | static void iw_send_thrspy_event(struct net_device * dev, | |
1369 | struct iw_spy_data * spydata, | |
1370 | unsigned char * address, | |
1371 | struct iw_quality * wstats) | |
1372 | { | |
1373 | union iwreq_data wrqu; | |
1374 | struct iw_thrspy threshold; | |
1375 | ||
1376 | /* Init */ | |
1377 | wrqu.data.length = 1; | |
1378 | wrqu.data.flags = 0; | |
1379 | /* Copy address */ | |
1380 | memcpy(threshold.addr.sa_data, address, ETH_ALEN); | |
1381 | threshold.addr.sa_family = ARPHRD_ETHER; | |
1382 | /* Copy stats */ | |
1383 | memcpy(&(threshold.qual), wstats, sizeof(struct iw_quality)); | |
1384 | /* Copy also thresholds */ | |
1385 | memcpy(&(threshold.low), &(spydata->spy_thr_low), | |
1386 | 2 * sizeof(struct iw_quality)); | |
1387 | ||
1388 | #ifdef WE_SPY_DEBUG | |
1389 | printk(KERN_DEBUG "iw_send_thrspy_event() : address %02X:%02X:%02X:%02X:%02X:%02X, level %d, up = %d\n", | |
1390 | threshold.addr.sa_data[0], | |
1391 | threshold.addr.sa_data[1], | |
1392 | threshold.addr.sa_data[2], | |
1393 | threshold.addr.sa_data[3], | |
1394 | threshold.addr.sa_data[4], | |
1395 | threshold.addr.sa_data[5], threshold.qual.level); | |
1396 | #endif /* WE_SPY_DEBUG */ | |
1397 | ||
1398 | /* Send event to user space */ | |
1399 | wireless_send_event(dev, SIOCGIWTHRSPY, &wrqu, (char *) &threshold); | |
1400 | } | |
1401 | ||
1402 | /* ---------------------------------------------------------------- */ | |
1403 | /* | |
1404 | * Call for the driver to update the spy data. | |
1405 | * For now, the spy data is a simple array. As the size of the array is | |
1406 | * small, this is good enough. If we wanted to support larger number of | |
1407 | * spy addresses, we should use something more efficient... | |
1408 | */ | |
1409 | void wireless_spy_update(struct net_device * dev, | |
1410 | unsigned char * address, | |
1411 | struct iw_quality * wstats) | |
1412 | { | |
1413 | struct iw_spy_data * spydata = get_spydata(dev); | |
1414 | int i; | |
1415 | int match = -1; | |
1416 | ||
1417 | /* Make sure driver is not buggy or using the old API */ | |
1418 | if(!spydata) | |
1419 | return; | |
1420 | ||
1421 | #ifdef WE_SPY_DEBUG | |
1422 | printk(KERN_DEBUG "wireless_spy_update() : offset %ld, spydata %p, address %02X:%02X:%02X:%02X:%02X:%02X\n", dev->wireless_handlers->spy_offset, spydata, address[0], address[1], address[2], address[3], address[4], address[5]); | |
1423 | #endif /* WE_SPY_DEBUG */ | |
1424 | ||
1425 | /* Update all records that match */ | |
1426 | for(i = 0; i < spydata->spy_number; i++) | |
1427 | if(!memcmp(address, spydata->spy_address[i], ETH_ALEN)) { | |
1428 | memcpy(&(spydata->spy_stat[i]), wstats, | |
1429 | sizeof(struct iw_quality)); | |
1430 | match = i; | |
1431 | } | |
1432 | ||
1433 | /* Generate an event if we cross the spy threshold. | |
1434 | * To avoid event storms, we have a simple hysteresis : we generate | |
1435 | * event only when we go under the low threshold or above the | |
1436 | * high threshold. */ | |
1437 | if(match >= 0) { | |
1438 | if(spydata->spy_thr_under[match]) { | |
1439 | if(wstats->level > spydata->spy_thr_high.level) { | |
1440 | spydata->spy_thr_under[match] = 0; | |
1441 | iw_send_thrspy_event(dev, spydata, | |
1442 | address, wstats); | |
1443 | } | |
1444 | } else { | |
1445 | if(wstats->level < spydata->spy_thr_low.level) { | |
1446 | spydata->spy_thr_under[match] = 1; | |
1447 | iw_send_thrspy_event(dev, spydata, | |
1448 | address, wstats); | |
1449 | } | |
1450 | } | |
1451 | } | |
1452 | } | |
1453 | ||
1454 | EXPORT_SYMBOL(iw_handler_get_spy); | |
1455 | EXPORT_SYMBOL(iw_handler_get_thrspy); | |
1456 | EXPORT_SYMBOL(iw_handler_set_spy); | |
1457 | EXPORT_SYMBOL(iw_handler_set_thrspy); | |
1458 | EXPORT_SYMBOL(wireless_send_event); | |
1459 | EXPORT_SYMBOL(wireless_spy_update); |