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1 | /* |
2 | * This file define the new driver API for Wireless Extensions | |
3 | * | |
4 | * Version : 6 21.6.04 | |
5 | * | |
6 | * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com> | |
7 | * Copyright (c) 2001-2004 Jean Tourrilhes, All Rights Reserved. | |
8 | */ | |
9 | ||
10 | #ifndef _IW_HANDLER_H | |
11 | #define _IW_HANDLER_H | |
12 | ||
13 | /************************** DOCUMENTATION **************************/ | |
14 | /* | |
15 | * Initial driver API (1996 -> onward) : | |
16 | * ----------------------------------- | |
17 | * The initial API just sends the IOCTL request received from user space | |
18 | * to the driver (via the driver ioctl handler). The driver has to | |
19 | * handle all the rest... | |
20 | * | |
21 | * The initial API also defines a specific handler in struct net_device | |
22 | * to handle wireless statistics. | |
23 | * | |
24 | * The initial APIs served us well and has proven a reasonably good design. | |
25 | * However, there is a few shortcommings : | |
26 | * o No events, everything is a request to the driver. | |
27 | * o Large ioctl function in driver with gigantic switch statement | |
28 | * (i.e. spaghetti code). | |
29 | * o Driver has to mess up with copy_to/from_user, and in many cases | |
30 | * does it unproperly. Common mistakes are : | |
31 | * * buffer overflows (no checks or off by one checks) | |
32 | * * call copy_to/from_user with irq disabled | |
33 | * o The user space interface is tied to ioctl because of the use | |
34 | * copy_to/from_user. | |
35 | * | |
36 | * New driver API (2002 -> onward) : | |
37 | * ------------------------------- | |
38 | * The new driver API is just a bunch of standard functions (handlers), | |
39 | * each handling a specific Wireless Extension. The driver just export | |
40 | * the list of handler it supports, and those will be called apropriately. | |
41 | * | |
42 | * I tried to keep the main advantage of the previous API (simplicity, | |
43 | * efficiency and light weight), and also I provide a good dose of backward | |
44 | * compatibility (most structures are the same, driver can use both API | |
45 | * simultaneously, ...). | |
46 | * Hopefully, I've also addressed the shortcomming of the initial API. | |
47 | * | |
48 | * The advantage of the new API are : | |
49 | * o Handling of Extensions in driver broken in small contained functions | |
50 | * o Tighter checks of ioctl before calling the driver | |
51 | * o Flexible commit strategy (at least, the start of it) | |
52 | * o Backward compatibility (can be mixed with old API) | |
53 | * o Driver doesn't have to worry about memory and user-space issues | |
54 | * The last point is important for the following reasons : | |
55 | * o You are now able to call the new driver API from any API you | |
56 | * want (including from within other parts of the kernel). | |
57 | * o Common mistakes are avoided (buffer overflow, user space copy | |
58 | * with irq disabled and so on). | |
59 | * | |
60 | * The Drawback of the new API are : | |
61 | * o bloat (especially kernel) | |
62 | * o need to migrate existing drivers to new API | |
63 | * My initial testing shows that the new API adds around 3kB to the kernel | |
64 | * and save between 0 and 5kB from a typical driver. | |
65 | * Also, as all structures and data types are unchanged, the migration is | |
66 | * quite straightforward (but tedious). | |
67 | * | |
68 | * --- | |
69 | * | |
70 | * The new driver API is defined below in this file. User space should | |
71 | * not be aware of what's happening down there... | |
72 | * | |
73 | * A new kernel wrapper is in charge of validating the IOCTLs and calling | |
74 | * the appropriate driver handler. This is implemented in : | |
75 | * # net/core/wireless.c | |
76 | * | |
77 | * The driver export the list of handlers in : | |
78 | * # include/linux/netdevice.h (one place) | |
79 | * | |
80 | * The new driver API is available for WIRELESS_EXT >= 13. | |
81 | * Good luck with migration to the new API ;-) | |
82 | */ | |
83 | ||
84 | /* ---------------------- THE IMPLEMENTATION ---------------------- */ | |
85 | /* | |
86 | * Some of the choice I've made are pretty controversials. Defining an | |
87 | * API is very much weighting compromises. This goes into some of the | |
88 | * details and the thinking behind the implementation. | |
89 | * | |
90 | * Implementation goals : | |
91 | * -------------------- | |
92 | * The implementation goals were as follow : | |
93 | * o Obvious : you should not need a PhD to understand what's happening, | |
94 | * the benefit is easier maintainance. | |
95 | * o Flexible : it should accommodate a wide variety of driver | |
96 | * implementations and be as flexible as the old API. | |
97 | * o Lean : it should be efficient memory wise to minimise the impact | |
98 | * on kernel footprint. | |
99 | * o Transparent to user space : the large number of user space | |
100 | * applications that use Wireless Extensions should not need | |
101 | * any modifications. | |
102 | * | |
103 | * Array of functions versus Struct of functions | |
104 | * --------------------------------------------- | |
105 | * 1) Having an array of functions allow the kernel code to access the | |
106 | * handler in a single lookup, which is much more efficient (think hash | |
107 | * table here). | |
108 | * 2) The only drawback is that driver writer may put their handler in | |
109 | * the wrong slot. This is trivial to test (I set the frequency, the | |
110 | * bitrate changes). Once the handler is in the proper slot, it will be | |
111 | * there forever, because the array is only extended at the end. | |
112 | * 3) Backward/forward compatibility : adding new handler just require | |
113 | * extending the array, so you can put newer driver in older kernel | |
114 | * without having to patch the kernel code (and vice versa). | |
115 | * | |
116 | * All handler are of the same generic type | |
117 | * ---------------------------------------- | |
118 | * That's a feature !!! | |
119 | * 1) Having a generic handler allow to have generic code, which is more | |
120 | * efficient. If each of the handler was individually typed I would need | |
121 | * to add a big switch in the kernel (== more bloat). This solution is | |
122 | * more scalable, adding new Wireless Extensions doesn't add new code. | |
123 | * 2) You can use the same handler in different slots of the array. For | |
124 | * hardware, it may be more efficient or logical to handle multiple | |
125 | * Wireless Extensions with a single function, and the API allow you to | |
126 | * do that. (An example would be a single record on the card to control | |
127 | * both bitrate and frequency, the handler would read the old record, | |
128 | * modify it according to info->cmd and rewrite it). | |
129 | * | |
130 | * Functions prototype uses union iwreq_data | |
131 | * ----------------------------------------- | |
132 | * Some would have prefered functions defined this way : | |
133 | * static int mydriver_ioctl_setrate(struct net_device *dev, | |
134 | * long rate, int auto) | |
135 | * 1) The kernel code doesn't "validate" the content of iwreq_data, and | |
136 | * can't do it (different hardware may have different notion of what a | |
137 | * valid frequency is), so we don't pretend that we do it. | |
138 | * 2) The above form is not extendable. If I want to add a flag (for | |
139 | * example to distinguish setting max rate and basic rate), I would | |
140 | * break the prototype. Using iwreq_data is more flexible. | |
141 | * 3) Also, the above form is not generic (see above). | |
142 | * 4) I don't expect driver developper using the wrong field of the | |
143 | * union (Doh !), so static typechecking doesn't add much value. | |
144 | * 5) Lastly, you can skip the union by doing : | |
145 | * static int mydriver_ioctl_setrate(struct net_device *dev, | |
146 | * struct iw_request_info *info, | |
147 | * struct iw_param *rrq, | |
148 | * char *extra) | |
149 | * And then adding the handler in the array like this : | |
150 | * (iw_handler) mydriver_ioctl_setrate, // SIOCSIWRATE | |
151 | * | |
152 | * Using functions and not a registry | |
153 | * ---------------------------------- | |
154 | * Another implementation option would have been for every instance to | |
155 | * define a registry (a struct containing all the Wireless Extensions) | |
156 | * and only have a function to commit the registry to the hardware. | |
157 | * 1) This approach can be emulated by the current code, but not | |
158 | * vice versa. | |
159 | * 2) Some drivers don't keep any configuration in the driver, for them | |
160 | * adding such a registry would be a significant bloat. | |
161 | * 3) The code to translate from Wireless Extension to native format is | |
162 | * needed anyway, so it would not reduce significantely the amount of code. | |
163 | * 4) The current approach only selectively translate Wireless Extensions | |
164 | * to native format and only selectively set, whereas the registry approach | |
165 | * would require to translate all WE and set all parameters for any single | |
166 | * change. | |
167 | * 5) For many Wireless Extensions, the GET operation return the current | |
168 | * dynamic value, not the value that was set. | |
169 | * | |
170 | * This header is <net/iw_handler.h> | |
171 | * --------------------------------- | |
172 | * 1) This header is kernel space only and should not be exported to | |
173 | * user space. Headers in "include/linux/" are exported, headers in | |
174 | * "include/net/" are not. | |
175 | * | |
176 | * Mixed 32/64 bit issues | |
177 | * ---------------------- | |
178 | * The Wireless Extensions are designed to be 64 bit clean, by using only | |
179 | * datatypes with explicit storage size. | |
180 | * There are some issues related to kernel and user space using different | |
181 | * memory model, and in particular 64bit kernel with 32bit user space. | |
182 | * The problem is related to struct iw_point, that contains a pointer | |
183 | * that *may* need to be translated. | |
184 | * This is quite messy. The new API doesn't solve this problem (it can't), | |
185 | * but is a step in the right direction : | |
186 | * 1) Meta data about each ioctl is easily available, so we know what type | |
187 | * of translation is needed. | |
188 | * 2) The move of data between kernel and user space is only done in a single | |
189 | * place in the kernel, so adding specific hooks in there is possible. | |
190 | * 3) In the long term, it allows to move away from using ioctl as the | |
191 | * user space API. | |
192 | * | |
193 | * So many comments and so few code | |
194 | * -------------------------------- | |
195 | * That's a feature. Comments won't bloat the resulting kernel binary. | |
196 | */ | |
197 | ||
198 | /***************************** INCLUDES *****************************/ | |
199 | ||
200 | #include <linux/wireless.h> /* IOCTL user space API */ | |
201 | #include <linux/if_ether.h> | |
202 | ||
203 | /***************************** VERSION *****************************/ | |
204 | /* | |
205 | * This constant is used to know which version of the driver API is | |
206 | * available. Hopefully, this will be pretty stable and no changes | |
207 | * will be needed... | |
208 | * I just plan to increment with each new version. | |
209 | */ | |
210 | #define IW_HANDLER_VERSION 6 | |
211 | ||
212 | /* | |
213 | * Changes : | |
214 | * | |
215 | * V2 to V3 | |
216 | * -------- | |
217 | * - Move event definition in <linux/wireless.h> | |
218 | * - Add Wireless Event support : | |
219 | * o wireless_send_event() prototype | |
220 | * o iwe_stream_add_event/point() inline functions | |
221 | * V3 to V4 | |
222 | * -------- | |
223 | * - Reshuffle IW_HEADER_TYPE_XXX to map IW_PRIV_TYPE_XXX changes | |
224 | * | |
225 | * V4 to V5 | |
226 | * -------- | |
227 | * - Add new spy support : struct iw_spy_data & prototypes | |
228 | * | |
229 | * V5 to V6 | |
230 | * -------- | |
231 | * - Change the way we get to spy_data method for added safety | |
232 | * - Remove spy #ifdef, they are always on -> cleaner code | |
233 | * - Add IW_DESCR_FLAG_NOMAX flag for very large requests | |
234 | * - Start migrating get_wireless_stats to struct iw_handler_def | |
235 | */ | |
236 | ||
237 | /**************************** CONSTANTS ****************************/ | |
238 | ||
239 | /* Enhanced spy support available */ | |
240 | #define IW_WIRELESS_SPY | |
241 | #define IW_WIRELESS_THRSPY | |
242 | ||
243 | /* Special error message for the driver to indicate that we | |
244 | * should do a commit after return from the iw_handler */ | |
245 | #define EIWCOMMIT EINPROGRESS | |
246 | ||
247 | /* Flags available in struct iw_request_info */ | |
248 | #define IW_REQUEST_FLAG_NONE 0x0000 /* No flag so far */ | |
249 | ||
250 | /* Type of headers we know about (basically union iwreq_data) */ | |
251 | #define IW_HEADER_TYPE_NULL 0 /* Not available */ | |
252 | #define IW_HEADER_TYPE_CHAR 2 /* char [IFNAMSIZ] */ | |
253 | #define IW_HEADER_TYPE_UINT 4 /* __u32 */ | |
254 | #define IW_HEADER_TYPE_FREQ 5 /* struct iw_freq */ | |
255 | #define IW_HEADER_TYPE_ADDR 6 /* struct sockaddr */ | |
256 | #define IW_HEADER_TYPE_POINT 8 /* struct iw_point */ | |
257 | #define IW_HEADER_TYPE_PARAM 9 /* struct iw_param */ | |
258 | #define IW_HEADER_TYPE_QUAL 10 /* struct iw_quality */ | |
259 | ||
260 | /* Handling flags */ | |
261 | /* Most are not implemented. I just use them as a reminder of some | |
262 | * cool features we might need one day ;-) */ | |
263 | #define IW_DESCR_FLAG_NONE 0x0000 /* Obvious */ | |
264 | /* Wrapper level flags */ | |
265 | #define IW_DESCR_FLAG_DUMP 0x0001 /* Not part of the dump command */ | |
266 | #define IW_DESCR_FLAG_EVENT 0x0002 /* Generate an event on SET */ | |
267 | #define IW_DESCR_FLAG_RESTRICT 0x0004 /* GET : request is ROOT only */ | |
268 | /* SET : Omit payload from generated iwevent */ | |
269 | #define IW_DESCR_FLAG_NOMAX 0x0008 /* GET : no limit on request size */ | |
270 | /* Driver level flags */ | |
271 | #define IW_DESCR_FLAG_WAIT 0x0100 /* Wait for driver event */ | |
272 | ||
273 | /****************************** TYPES ******************************/ | |
274 | ||
275 | /* ----------------------- WIRELESS HANDLER ----------------------- */ | |
276 | /* | |
277 | * A wireless handler is just a standard function, that looks like the | |
278 | * ioctl handler. | |
279 | * We also define there how a handler list look like... As the Wireless | |
280 | * Extension space is quite dense, we use a simple array, which is faster | |
281 | * (that's the perfect hash table ;-). | |
282 | */ | |
283 | ||
284 | /* | |
285 | * Meta data about the request passed to the iw_handler. | |
286 | * Most handlers can safely ignore what's in there. | |
287 | * The 'cmd' field might come handy if you want to use the same handler | |
288 | * for multiple command... | |
289 | * This struct is also my long term insurance. I can add new fields here | |
290 | * without breaking the prototype of iw_handler... | |
291 | */ | |
292 | struct iw_request_info | |
293 | { | |
294 | __u16 cmd; /* Wireless Extension command */ | |
295 | __u16 flags; /* More to come ;-) */ | |
296 | }; | |
297 | ||
298 | struct net_device; | |
299 | ||
300 | /* | |
301 | * This is how a function handling a Wireless Extension should look | |
302 | * like (both get and set, standard and private). | |
303 | */ | |
304 | typedef int (*iw_handler)(struct net_device *dev, struct iw_request_info *info, | |
305 | union iwreq_data *wrqu, char *extra); | |
306 | ||
307 | /* | |
308 | * This define all the handler that the driver export. | |
309 | * As you need only one per driver type, please use a static const | |
310 | * shared by all driver instances... Same for the members... | |
311 | * This will be linked from net_device in <linux/netdevice.h> | |
312 | */ | |
313 | struct iw_handler_def | |
314 | { | |
315 | /* Number of handlers defined (more precisely, index of the | |
316 | * last defined handler + 1) */ | |
317 | __u16 num_standard; | |
318 | __u16 num_private; | |
319 | /* Number of private arg description */ | |
320 | __u16 num_private_args; | |
321 | ||
322 | /* Array of handlers for standard ioctls | |
323 | * We will call dev->wireless_handlers->standard[ioctl - SIOCSIWNAME] | |
324 | */ | |
325 | const iw_handler * standard; | |
326 | ||
327 | /* Array of handlers for private ioctls | |
328 | * Will call dev->wireless_handlers->private[ioctl - SIOCIWFIRSTPRIV] | |
329 | */ | |
330 | const iw_handler * private; | |
331 | ||
332 | /* Arguments of private handler. This one is just a list, so you | |
333 | * can put it in any order you want and should not leave holes... | |
334 | * We will automatically export that to user space... */ | |
335 | const struct iw_priv_args * private_args; | |
336 | ||
337 | /* This field will be *removed* in the next version of WE */ | |
338 | long spy_offset; /* DO NOT USE */ | |
339 | ||
340 | /* New location of get_wireless_stats, to de-bloat struct net_device. | |
341 | * The old pointer in struct net_device will be gradually phased | |
342 | * out, and drivers are encouraged to use this one... */ | |
343 | struct iw_statistics* (*get_wireless_stats)(struct net_device *dev); | |
344 | }; | |
345 | ||
346 | /* ---------------------- IOCTL DESCRIPTION ---------------------- */ | |
347 | /* | |
348 | * One of the main goal of the new interface is to deal entirely with | |
349 | * user space/kernel space memory move. | |
350 | * For that, we need to know : | |
351 | * o if iwreq is a pointer or contain the full data | |
352 | * o what is the size of the data to copy | |
353 | * | |
354 | * For private IOCTLs, we use the same rules as used by iwpriv and | |
355 | * defined in struct iw_priv_args. | |
356 | * | |
357 | * For standard IOCTLs, things are quite different and we need to | |
358 | * use the stuctures below. Actually, this struct is also more | |
359 | * efficient, but that's another story... | |
360 | */ | |
361 | ||
362 | /* | |
363 | * Describe how a standard IOCTL looks like. | |
364 | */ | |
365 | struct iw_ioctl_description | |
366 | { | |
367 | __u8 header_type; /* NULL, iw_point or other */ | |
368 | __u8 token_type; /* Future */ | |
369 | __u16 token_size; /* Granularity of payload */ | |
370 | __u16 min_tokens; /* Min acceptable token number */ | |
371 | __u16 max_tokens; /* Max acceptable token number */ | |
372 | __u32 flags; /* Special handling of the request */ | |
373 | }; | |
374 | ||
375 | /* Need to think of short header translation table. Later. */ | |
376 | ||
377 | /* --------------------- ENHANCED SPY SUPPORT --------------------- */ | |
378 | /* | |
379 | * In the old days, the driver was handling spy support all by itself. | |
380 | * Now, the driver can delegate this task to Wireless Extensions. | |
381 | * It needs to include this struct in its private part and use the | |
382 | * standard spy iw_handler. | |
383 | */ | |
384 | ||
385 | /* | |
386 | * Instance specific spy data, i.e. addresses spied and quality for them. | |
387 | */ | |
388 | struct iw_spy_data | |
389 | { | |
390 | /* --- Standard spy support --- */ | |
391 | int spy_number; | |
392 | u_char spy_address[IW_MAX_SPY][ETH_ALEN]; | |
393 | struct iw_quality spy_stat[IW_MAX_SPY]; | |
394 | /* --- Enhanced spy support (event) */ | |
395 | struct iw_quality spy_thr_low; /* Low threshold */ | |
396 | struct iw_quality spy_thr_high; /* High threshold */ | |
397 | u_char spy_thr_under[IW_MAX_SPY]; | |
398 | }; | |
399 | ||
400 | /* --------------------- DEVICE WIRELESS DATA --------------------- */ | |
401 | /* | |
402 | * This is all the wireless data specific to a device instance that | |
403 | * is managed by the core of Wireless Extensions. | |
404 | * We only keep pointer to those structures, so that a driver is free | |
405 | * to share them between instances. | |
406 | * This structure should be initialised before registering the device. | |
407 | * Access to this data follow the same rules as any other struct net_device | |
408 | * data (i.e. valid as long as struct net_device exist, same locking rules). | |
409 | */ | |
410 | struct iw_public_data { | |
411 | /* Driver enhanced spy support */ | |
412 | struct iw_spy_data * spy_data; | |
413 | }; | |
414 | ||
415 | /**************************** PROTOTYPES ****************************/ | |
416 | /* | |
417 | * Functions part of the Wireless Extensions (defined in net/core/wireless.c). | |
418 | * Those may be called only within the kernel. | |
419 | */ | |
420 | ||
421 | /* First : function strictly used inside the kernel */ | |
422 | ||
423 | /* Handle /proc/net/wireless, called in net/code/dev.c */ | |
424 | extern int dev_get_wireless_info(char * buffer, char **start, off_t offset, | |
425 | int length); | |
426 | ||
427 | /* Handle IOCTLs, called in net/code/dev.c */ | |
428 | extern int wireless_process_ioctl(struct ifreq *ifr, unsigned int cmd); | |
429 | ||
430 | /* Second : functions that may be called by driver modules */ | |
431 | ||
432 | /* Send a single event to user space */ | |
433 | extern void wireless_send_event(struct net_device * dev, | |
434 | unsigned int cmd, | |
435 | union iwreq_data * wrqu, | |
436 | char * extra); | |
437 | ||
438 | /* We may need a function to send a stream of events to user space. | |
439 | * More on that later... */ | |
440 | ||
441 | /* Standard handler for SIOCSIWSPY */ | |
442 | extern int iw_handler_set_spy(struct net_device * dev, | |
443 | struct iw_request_info * info, | |
444 | union iwreq_data * wrqu, | |
445 | char * extra); | |
446 | /* Standard handler for SIOCGIWSPY */ | |
447 | extern int iw_handler_get_spy(struct net_device * dev, | |
448 | struct iw_request_info * info, | |
449 | union iwreq_data * wrqu, | |
450 | char * extra); | |
451 | /* Standard handler for SIOCSIWTHRSPY */ | |
452 | extern int iw_handler_set_thrspy(struct net_device * dev, | |
453 | struct iw_request_info *info, | |
454 | union iwreq_data * wrqu, | |
455 | char * extra); | |
456 | /* Standard handler for SIOCGIWTHRSPY */ | |
457 | extern int iw_handler_get_thrspy(struct net_device * dev, | |
458 | struct iw_request_info *info, | |
459 | union iwreq_data * wrqu, | |
460 | char * extra); | |
461 | /* Driver call to update spy records */ | |
462 | extern void wireless_spy_update(struct net_device * dev, | |
463 | unsigned char * address, | |
464 | struct iw_quality * wstats); | |
465 | ||
466 | /************************* INLINE FUNTIONS *************************/ | |
467 | /* | |
468 | * Function that are so simple that it's more efficient inlining them | |
469 | */ | |
470 | ||
471 | /*------------------------------------------------------------------*/ | |
472 | /* | |
473 | * Wrapper to add an Wireless Event to a stream of events. | |
474 | */ | |
475 | static inline char * | |
476 | iwe_stream_add_event(char * stream, /* Stream of events */ | |
477 | char * ends, /* End of stream */ | |
478 | struct iw_event *iwe, /* Payload */ | |
479 | int event_len) /* Real size of payload */ | |
480 | { | |
481 | /* Check if it's possible */ | |
482 | if((stream + event_len) < ends) { | |
483 | iwe->len = event_len; | |
484 | memcpy(stream, (char *) iwe, event_len); | |
485 | stream += event_len; | |
486 | } | |
487 | return stream; | |
488 | } | |
489 | ||
490 | /*------------------------------------------------------------------*/ | |
491 | /* | |
492 | * Wrapper to add an short Wireless Event containing a pointer to a | |
493 | * stream of events. | |
494 | */ | |
495 | static inline char * | |
496 | iwe_stream_add_point(char * stream, /* Stream of events */ | |
497 | char * ends, /* End of stream */ | |
498 | struct iw_event *iwe, /* Payload */ | |
499 | char * extra) | |
500 | { | |
501 | int event_len = IW_EV_POINT_LEN + iwe->u.data.length; | |
502 | /* Check if it's possible */ | |
503 | if((stream + event_len) < ends) { | |
504 | iwe->len = event_len; | |
505 | memcpy(stream, (char *) iwe, IW_EV_POINT_LEN); | |
506 | memcpy(stream + IW_EV_POINT_LEN, extra, iwe->u.data.length); | |
507 | stream += event_len; | |
508 | } | |
509 | return stream; | |
510 | } | |
511 | ||
512 | /*------------------------------------------------------------------*/ | |
513 | /* | |
514 | * Wrapper to add a value to a Wireless Event in a stream of events. | |
515 | * Be careful, this one is tricky to use properly : | |
516 | * At the first run, you need to have (value = event + IW_EV_LCP_LEN). | |
517 | */ | |
518 | static inline char * | |
519 | iwe_stream_add_value(char * event, /* Event in the stream */ | |
520 | char * value, /* Value in event */ | |
521 | char * ends, /* End of stream */ | |
522 | struct iw_event *iwe, /* Payload */ | |
523 | int event_len) /* Real size of payload */ | |
524 | { | |
525 | /* Don't duplicate LCP */ | |
526 | event_len -= IW_EV_LCP_LEN; | |
527 | ||
528 | /* Check if it's possible */ | |
529 | if((value + event_len) < ends) { | |
530 | /* Add new value */ | |
531 | memcpy(value, (char *) iwe + IW_EV_LCP_LEN, event_len); | |
532 | value += event_len; | |
533 | /* Patch LCP */ | |
534 | iwe->len = value - event; | |
535 | memcpy(event, (char *) iwe, IW_EV_LCP_LEN); | |
536 | } | |
537 | return value; | |
538 | } | |
539 | ||
540 | #endif /* _IW_HANDLER_H */ |