2 * This file implement the Wireless Extensions APIs.
4 * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
5 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
7 * (As all part of the Linux kernel, this file is GPL)
10 /************************** DOCUMENTATION **************************/
14 * See <linux/wireless.h> for details of the APIs and the rest.
19 * v1 - 5.12.01 - Jean II
20 * o Created this file.
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
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
36 * v4 - 18.04.02 - Jean II
37 * o Fix stupid off by one in iw_ioctl_description : IW_ESSID_MAX_SIZE + 1
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)
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
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
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 lose INVALID/DBM flags when clearing UPDATED flags (iwstats)
69 * v8 - 17.02.06 - Jean II
70 * o RtNetlink requests support (SET/GET)
72 * v8b - 03.08.06 - Herbert Xu
73 * o Fix Wireless Event locking issues.
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()
80 * v10 - 16.3.07 - Jean II
81 * o Prevent leaking of kernel space in stream on 64 bits.
84 /***************************** INCLUDES *****************************/
86 #include <linux/module.h>
87 #include <linux/types.h> /* off_t */
88 #include <linux/netdevice.h> /* struct ifreq, dev_get_by_name() */
89 #include <linux/proc_fs.h>
90 #include <linux/rtnetlink.h> /* rtnetlink stuff */
91 #include <linux/seq_file.h>
92 #include <linux/init.h> /* for __init */
93 #include <linux/if_arp.h> /* ARPHRD_ETHER */
94 #include <linux/etherdevice.h> /* compare_ether_addr */
95 #include <linux/interrupt.h>
96 #include <net/net_namespace.h>
98 #include <linux/wireless.h> /* Pretty obvious */
99 #include <net/iw_handler.h> /* New driver API */
100 #include <net/netlink.h>
101 #include <net/wext.h>
103 #include <asm/uaccess.h> /* copy_to_user() */
105 /************************* GLOBAL VARIABLES *************************/
107 * You should not use global variables, because of re-entrancy.
108 * On our case, it's only const, so it's OK...
111 * Meta-data about all the standard Wireless Extension request we
114 static const struct iw_ioctl_description standard_ioctl
[] = {
115 [SIOCSIWCOMMIT
- SIOCIWFIRST
] = {
116 .header_type
= IW_HEADER_TYPE_NULL
,
118 [SIOCGIWNAME
- SIOCIWFIRST
] = {
119 .header_type
= IW_HEADER_TYPE_CHAR
,
120 .flags
= IW_DESCR_FLAG_DUMP
,
122 [SIOCSIWNWID
- SIOCIWFIRST
] = {
123 .header_type
= IW_HEADER_TYPE_PARAM
,
124 .flags
= IW_DESCR_FLAG_EVENT
,
126 [SIOCGIWNWID
- SIOCIWFIRST
] = {
127 .header_type
= IW_HEADER_TYPE_PARAM
,
128 .flags
= IW_DESCR_FLAG_DUMP
,
130 [SIOCSIWFREQ
- SIOCIWFIRST
] = {
131 .header_type
= IW_HEADER_TYPE_FREQ
,
132 .flags
= IW_DESCR_FLAG_EVENT
,
134 [SIOCGIWFREQ
- SIOCIWFIRST
] = {
135 .header_type
= IW_HEADER_TYPE_FREQ
,
136 .flags
= IW_DESCR_FLAG_DUMP
,
138 [SIOCSIWMODE
- SIOCIWFIRST
] = {
139 .header_type
= IW_HEADER_TYPE_UINT
,
140 .flags
= IW_DESCR_FLAG_EVENT
,
142 [SIOCGIWMODE
- SIOCIWFIRST
] = {
143 .header_type
= IW_HEADER_TYPE_UINT
,
144 .flags
= IW_DESCR_FLAG_DUMP
,
146 [SIOCSIWSENS
- SIOCIWFIRST
] = {
147 .header_type
= IW_HEADER_TYPE_PARAM
,
149 [SIOCGIWSENS
- SIOCIWFIRST
] = {
150 .header_type
= IW_HEADER_TYPE_PARAM
,
152 [SIOCSIWRANGE
- SIOCIWFIRST
] = {
153 .header_type
= IW_HEADER_TYPE_NULL
,
155 [SIOCGIWRANGE
- SIOCIWFIRST
] = {
156 .header_type
= IW_HEADER_TYPE_POINT
,
158 .max_tokens
= sizeof(struct iw_range
),
159 .flags
= IW_DESCR_FLAG_DUMP
,
161 [SIOCSIWPRIV
- SIOCIWFIRST
] = {
162 .header_type
= IW_HEADER_TYPE_NULL
,
164 [SIOCGIWPRIV
- SIOCIWFIRST
] = { /* (handled directly by us) */
165 .header_type
= IW_HEADER_TYPE_POINT
,
166 .token_size
= sizeof(struct iw_priv_args
),
168 .flags
= IW_DESCR_FLAG_NOMAX
,
170 [SIOCSIWSTATS
- SIOCIWFIRST
] = {
171 .header_type
= IW_HEADER_TYPE_NULL
,
173 [SIOCGIWSTATS
- SIOCIWFIRST
] = { /* (handled directly by us) */
174 .header_type
= IW_HEADER_TYPE_POINT
,
176 .max_tokens
= sizeof(struct iw_statistics
),
177 .flags
= IW_DESCR_FLAG_DUMP
,
179 [SIOCSIWSPY
- SIOCIWFIRST
] = {
180 .header_type
= IW_HEADER_TYPE_POINT
,
181 .token_size
= sizeof(struct sockaddr
),
182 .max_tokens
= IW_MAX_SPY
,
184 [SIOCGIWSPY
- SIOCIWFIRST
] = {
185 .header_type
= IW_HEADER_TYPE_POINT
,
186 .token_size
= sizeof(struct sockaddr
) +
187 sizeof(struct iw_quality
),
188 .max_tokens
= IW_MAX_SPY
,
190 [SIOCSIWTHRSPY
- SIOCIWFIRST
] = {
191 .header_type
= IW_HEADER_TYPE_POINT
,
192 .token_size
= sizeof(struct iw_thrspy
),
196 [SIOCGIWTHRSPY
- SIOCIWFIRST
] = {
197 .header_type
= IW_HEADER_TYPE_POINT
,
198 .token_size
= sizeof(struct iw_thrspy
),
202 [SIOCSIWAP
- SIOCIWFIRST
] = {
203 .header_type
= IW_HEADER_TYPE_ADDR
,
205 [SIOCGIWAP
- SIOCIWFIRST
] = {
206 .header_type
= IW_HEADER_TYPE_ADDR
,
207 .flags
= IW_DESCR_FLAG_DUMP
,
209 [SIOCSIWMLME
- SIOCIWFIRST
] = {
210 .header_type
= IW_HEADER_TYPE_POINT
,
212 .min_tokens
= sizeof(struct iw_mlme
),
213 .max_tokens
= sizeof(struct iw_mlme
),
215 [SIOCGIWAPLIST
- SIOCIWFIRST
] = {
216 .header_type
= IW_HEADER_TYPE_POINT
,
217 .token_size
= sizeof(struct sockaddr
) +
218 sizeof(struct iw_quality
),
219 .max_tokens
= IW_MAX_AP
,
220 .flags
= IW_DESCR_FLAG_NOMAX
,
222 [SIOCSIWSCAN
- SIOCIWFIRST
] = {
223 .header_type
= IW_HEADER_TYPE_POINT
,
226 .max_tokens
= sizeof(struct iw_scan_req
),
228 [SIOCGIWSCAN
- SIOCIWFIRST
] = {
229 .header_type
= IW_HEADER_TYPE_POINT
,
231 .max_tokens
= IW_SCAN_MAX_DATA
,
232 .flags
= IW_DESCR_FLAG_NOMAX
,
234 [SIOCSIWESSID
- SIOCIWFIRST
] = {
235 .header_type
= IW_HEADER_TYPE_POINT
,
237 .max_tokens
= IW_ESSID_MAX_SIZE
,
238 .flags
= IW_DESCR_FLAG_EVENT
,
240 [SIOCGIWESSID
- SIOCIWFIRST
] = {
241 .header_type
= IW_HEADER_TYPE_POINT
,
243 .max_tokens
= IW_ESSID_MAX_SIZE
,
244 .flags
= IW_DESCR_FLAG_DUMP
,
246 [SIOCSIWNICKN
- SIOCIWFIRST
] = {
247 .header_type
= IW_HEADER_TYPE_POINT
,
249 .max_tokens
= IW_ESSID_MAX_SIZE
,
251 [SIOCGIWNICKN
- SIOCIWFIRST
] = {
252 .header_type
= IW_HEADER_TYPE_POINT
,
254 .max_tokens
= IW_ESSID_MAX_SIZE
,
256 [SIOCSIWRATE
- SIOCIWFIRST
] = {
257 .header_type
= IW_HEADER_TYPE_PARAM
,
259 [SIOCGIWRATE
- SIOCIWFIRST
] = {
260 .header_type
= IW_HEADER_TYPE_PARAM
,
262 [SIOCSIWRTS
- SIOCIWFIRST
] = {
263 .header_type
= IW_HEADER_TYPE_PARAM
,
265 [SIOCGIWRTS
- SIOCIWFIRST
] = {
266 .header_type
= IW_HEADER_TYPE_PARAM
,
268 [SIOCSIWFRAG
- SIOCIWFIRST
] = {
269 .header_type
= IW_HEADER_TYPE_PARAM
,
271 [SIOCGIWFRAG
- SIOCIWFIRST
] = {
272 .header_type
= IW_HEADER_TYPE_PARAM
,
274 [SIOCSIWTXPOW
- SIOCIWFIRST
] = {
275 .header_type
= IW_HEADER_TYPE_PARAM
,
277 [SIOCGIWTXPOW
- SIOCIWFIRST
] = {
278 .header_type
= IW_HEADER_TYPE_PARAM
,
280 [SIOCSIWRETRY
- SIOCIWFIRST
] = {
281 .header_type
= IW_HEADER_TYPE_PARAM
,
283 [SIOCGIWRETRY
- SIOCIWFIRST
] = {
284 .header_type
= IW_HEADER_TYPE_PARAM
,
286 [SIOCSIWENCODE
- SIOCIWFIRST
] = {
287 .header_type
= IW_HEADER_TYPE_POINT
,
289 .max_tokens
= IW_ENCODING_TOKEN_MAX
,
290 .flags
= IW_DESCR_FLAG_EVENT
| IW_DESCR_FLAG_RESTRICT
,
292 [SIOCGIWENCODE
- SIOCIWFIRST
] = {
293 .header_type
= IW_HEADER_TYPE_POINT
,
295 .max_tokens
= IW_ENCODING_TOKEN_MAX
,
296 .flags
= IW_DESCR_FLAG_DUMP
| IW_DESCR_FLAG_RESTRICT
,
298 [SIOCSIWPOWER
- SIOCIWFIRST
] = {
299 .header_type
= IW_HEADER_TYPE_PARAM
,
301 [SIOCGIWPOWER
- SIOCIWFIRST
] = {
302 .header_type
= IW_HEADER_TYPE_PARAM
,
304 [SIOCSIWGENIE
- SIOCIWFIRST
] = {
305 .header_type
= IW_HEADER_TYPE_POINT
,
307 .max_tokens
= IW_GENERIC_IE_MAX
,
309 [SIOCGIWGENIE
- SIOCIWFIRST
] = {
310 .header_type
= IW_HEADER_TYPE_POINT
,
312 .max_tokens
= IW_GENERIC_IE_MAX
,
314 [SIOCSIWAUTH
- SIOCIWFIRST
] = {
315 .header_type
= IW_HEADER_TYPE_PARAM
,
317 [SIOCGIWAUTH
- SIOCIWFIRST
] = {
318 .header_type
= IW_HEADER_TYPE_PARAM
,
320 [SIOCSIWENCODEEXT
- SIOCIWFIRST
] = {
321 .header_type
= IW_HEADER_TYPE_POINT
,
323 .min_tokens
= sizeof(struct iw_encode_ext
),
324 .max_tokens
= sizeof(struct iw_encode_ext
) +
325 IW_ENCODING_TOKEN_MAX
,
327 [SIOCGIWENCODEEXT
- SIOCIWFIRST
] = {
328 .header_type
= IW_HEADER_TYPE_POINT
,
330 .min_tokens
= sizeof(struct iw_encode_ext
),
331 .max_tokens
= sizeof(struct iw_encode_ext
) +
332 IW_ENCODING_TOKEN_MAX
,
334 [SIOCSIWPMKSA
- SIOCIWFIRST
] = {
335 .header_type
= IW_HEADER_TYPE_POINT
,
337 .min_tokens
= sizeof(struct iw_pmksa
),
338 .max_tokens
= sizeof(struct iw_pmksa
),
341 static const unsigned standard_ioctl_num
= ARRAY_SIZE(standard_ioctl
);
344 * Meta-data about all the additional standard Wireless Extension events
347 static const struct iw_ioctl_description standard_event
[] = {
348 [IWEVTXDROP
- IWEVFIRST
] = {
349 .header_type
= IW_HEADER_TYPE_ADDR
,
351 [IWEVQUAL
- IWEVFIRST
] = {
352 .header_type
= IW_HEADER_TYPE_QUAL
,
354 [IWEVCUSTOM
- IWEVFIRST
] = {
355 .header_type
= IW_HEADER_TYPE_POINT
,
357 .max_tokens
= IW_CUSTOM_MAX
,
359 [IWEVREGISTERED
- IWEVFIRST
] = {
360 .header_type
= IW_HEADER_TYPE_ADDR
,
362 [IWEVEXPIRED
- IWEVFIRST
] = {
363 .header_type
= IW_HEADER_TYPE_ADDR
,
365 [IWEVGENIE
- IWEVFIRST
] = {
366 .header_type
= IW_HEADER_TYPE_POINT
,
368 .max_tokens
= IW_GENERIC_IE_MAX
,
370 [IWEVMICHAELMICFAILURE
- IWEVFIRST
] = {
371 .header_type
= IW_HEADER_TYPE_POINT
,
373 .max_tokens
= sizeof(struct iw_michaelmicfailure
),
375 [IWEVASSOCREQIE
- IWEVFIRST
] = {
376 .header_type
= IW_HEADER_TYPE_POINT
,
378 .max_tokens
= IW_GENERIC_IE_MAX
,
380 [IWEVASSOCRESPIE
- IWEVFIRST
] = {
381 .header_type
= IW_HEADER_TYPE_POINT
,
383 .max_tokens
= IW_GENERIC_IE_MAX
,
385 [IWEVPMKIDCAND
- IWEVFIRST
] = {
386 .header_type
= IW_HEADER_TYPE_POINT
,
388 .max_tokens
= sizeof(struct iw_pmkid_cand
),
391 static const unsigned standard_event_num
= ARRAY_SIZE(standard_event
);
393 /* Size (in bytes) of the various private data types */
394 static const char iw_priv_type_size
[] = {
395 0, /* IW_PRIV_TYPE_NONE */
396 1, /* IW_PRIV_TYPE_BYTE */
397 1, /* IW_PRIV_TYPE_CHAR */
399 sizeof(__u32
), /* IW_PRIV_TYPE_INT */
400 sizeof(struct iw_freq
), /* IW_PRIV_TYPE_FLOAT */
401 sizeof(struct sockaddr
), /* IW_PRIV_TYPE_ADDR */
405 /* Size (in bytes) of various events */
406 static const int event_type_size
[] = {
407 IW_EV_LCP_LEN
, /* IW_HEADER_TYPE_NULL */
409 IW_EV_CHAR_LEN
, /* IW_HEADER_TYPE_CHAR */
411 IW_EV_UINT_LEN
, /* IW_HEADER_TYPE_UINT */
412 IW_EV_FREQ_LEN
, /* IW_HEADER_TYPE_FREQ */
413 IW_EV_ADDR_LEN
, /* IW_HEADER_TYPE_ADDR */
415 IW_EV_POINT_LEN
, /* Without variable payload */
416 IW_EV_PARAM_LEN
, /* IW_HEADER_TYPE_PARAM */
417 IW_EV_QUAL_LEN
, /* IW_HEADER_TYPE_QUAL */
421 /************************ COMMON SUBROUTINES ************************/
423 * Stuff that may be used in various place or doesn't fit in one
424 * of the section below.
427 /* ---------------------------------------------------------------- */
429 * Return the driver handler associated with a specific Wireless Extension.
431 static iw_handler
get_handler(struct net_device
*dev
, unsigned int cmd
)
433 /* Don't "optimise" the following variable, it will crash */
434 unsigned int index
; /* *MUST* be unsigned */
436 /* Check if we have some wireless handlers defined */
437 if (dev
->wireless_handlers
== NULL
)
440 /* Try as a standard command */
441 index
= cmd
- SIOCIWFIRST
;
442 if (index
< dev
->wireless_handlers
->num_standard
)
443 return dev
->wireless_handlers
->standard
[index
];
445 /* Try as a private command */
446 index
= cmd
- SIOCIWFIRSTPRIV
;
447 if (index
< dev
->wireless_handlers
->num_private
)
448 return dev
->wireless_handlers
->private[index
];
454 /* ---------------------------------------------------------------- */
456 * Get statistics out of the driver
458 static struct iw_statistics
*get_wireless_stats(struct net_device
*dev
)
461 if ((dev
->wireless_handlers
!= NULL
) &&
462 (dev
->wireless_handlers
->get_wireless_stats
!= NULL
))
463 return dev
->wireless_handlers
->get_wireless_stats(dev
);
469 /* ---------------------------------------------------------------- */
471 * Call the commit handler in the driver
472 * (if exist and if conditions are right)
474 * Note : our current commit strategy is currently pretty dumb,
475 * but we will be able to improve on that...
476 * The goal is to try to agreagate as many changes as possible
477 * before doing the commit. Drivers that will define a commit handler
478 * are usually those that need a reset after changing parameters, so
479 * we want to minimise the number of reset.
480 * A cool idea is to use a timer : at each "set" command, we re-set the
481 * timer, when the timer eventually fires, we call the driver.
482 * Hopefully, more on that later.
484 * Also, I'm waiting to see how many people will complain about the
485 * netif_running(dev) test. I'm open on that one...
486 * Hopefully, the driver will remember to do a commit in "open()" ;-)
488 static int call_commit_handler(struct net_device
*dev
)
490 if ((netif_running(dev
)) &&
491 (dev
->wireless_handlers
->standard
[0] != NULL
))
492 /* Call the commit handler on the driver */
493 return dev
->wireless_handlers
->standard
[0](dev
, NULL
,
496 return 0; /* Command completed successfully */
499 /* ---------------------------------------------------------------- */
501 * Calculate size of private arguments
503 static int get_priv_size(__u16 args
)
505 int num
= args
& IW_PRIV_SIZE_MASK
;
506 int type
= (args
& IW_PRIV_TYPE_MASK
) >> 12;
508 return num
* iw_priv_type_size
[type
];
511 /* ---------------------------------------------------------------- */
513 * Re-calculate the size of private arguments
515 static int adjust_priv_size(__u16 args
, struct iw_point
*iwp
)
517 int num
= iwp
->length
;
518 int max
= args
& IW_PRIV_SIZE_MASK
;
519 int type
= (args
& IW_PRIV_TYPE_MASK
) >> 12;
521 /* Make sure the driver doesn't goof up */
525 return num
* iw_priv_type_size
[type
];
528 /* ---------------------------------------------------------------- */
530 * Standard Wireless Handler : get wireless stats
531 * Allow programatic access to /proc/net/wireless even if /proc
532 * doesn't exist... Also more efficient...
534 static int iw_handler_get_iwstats(struct net_device
* dev
,
535 struct iw_request_info
* info
,
536 union iwreq_data
* wrqu
,
539 /* Get stats from the driver */
540 struct iw_statistics
*stats
;
542 stats
= get_wireless_stats(dev
);
544 /* Copy statistics to extra */
545 memcpy(extra
, stats
, sizeof(struct iw_statistics
));
546 wrqu
->data
.length
= sizeof(struct iw_statistics
);
548 /* Check if we need to clear the updated flag */
549 if (wrqu
->data
.flags
!= 0)
550 stats
->qual
.updated
&= ~IW_QUAL_ALL_UPDATED
;
556 /* ---------------------------------------------------------------- */
558 * Standard Wireless Handler : get iwpriv definitions
559 * Export the driver private handler definition
560 * They will be picked up by tools like iwpriv...
562 static int iw_handler_get_private(struct net_device
* dev
,
563 struct iw_request_info
* info
,
564 union iwreq_data
* wrqu
,
567 /* Check if the driver has something to export */
568 if ((dev
->wireless_handlers
->num_private_args
== 0) ||
569 (dev
->wireless_handlers
->private_args
== NULL
))
572 /* Check if there is enough buffer up there */
573 if (wrqu
->data
.length
< dev
->wireless_handlers
->num_private_args
) {
574 /* User space can't know in advance how large the buffer
575 * needs to be. Give it a hint, so that we can support
576 * any size buffer we want somewhat efficiently... */
577 wrqu
->data
.length
= dev
->wireless_handlers
->num_private_args
;
581 /* Set the number of available ioctls. */
582 wrqu
->data
.length
= dev
->wireless_handlers
->num_private_args
;
584 /* Copy structure to the user buffer. */
585 memcpy(extra
, dev
->wireless_handlers
->private_args
,
586 sizeof(struct iw_priv_args
) * wrqu
->data
.length
);
592 /******************** /proc/net/wireless SUPPORT ********************/
594 * The /proc/net/wireless file is a human readable user-space interface
595 * exporting various wireless specific statistics from the wireless devices.
596 * This is the most popular part of the Wireless Extensions ;-)
598 * This interface is a pure clone of /proc/net/dev (in net/core/dev.c).
599 * The content of the file is basically the content of "struct iw_statistics".
602 #ifdef CONFIG_PROC_FS
604 /* ---------------------------------------------------------------- */
606 * Print one entry (line) of /proc/net/wireless
608 static void wireless_seq_printf_stats(struct seq_file
*seq
,
609 struct net_device
*dev
)
611 /* Get stats from the driver */
612 struct iw_statistics
*stats
= get_wireless_stats(dev
);
613 static struct iw_statistics nullstats
= {};
615 /* show device if it's wireless regardless of current stats */
616 if (!stats
&& dev
->wireless_handlers
)
620 seq_printf(seq
, "%6s: %04x %3d%c %3d%c %3d%c %6d %6d %6d "
622 dev
->name
, stats
->status
, stats
->qual
.qual
,
623 stats
->qual
.updated
& IW_QUAL_QUAL_UPDATED
625 ((__s32
) stats
->qual
.level
) -
626 ((stats
->qual
.updated
& IW_QUAL_DBM
) ? 0x100 : 0),
627 stats
->qual
.updated
& IW_QUAL_LEVEL_UPDATED
629 ((__s32
) stats
->qual
.noise
) -
630 ((stats
->qual
.updated
& IW_QUAL_DBM
) ? 0x100 : 0),
631 stats
->qual
.updated
& IW_QUAL_NOISE_UPDATED
633 stats
->discard
.nwid
, stats
->discard
.code
,
634 stats
->discard
.fragment
, stats
->discard
.retries
,
635 stats
->discard
.misc
, stats
->miss
.beacon
);
637 if (stats
!= &nullstats
)
638 stats
->qual
.updated
&= ~IW_QUAL_ALL_UPDATED
;
642 /* ---------------------------------------------------------------- */
644 * Print info for /proc/net/wireless (print all entries)
646 static int wireless_dev_seq_show(struct seq_file
*seq
, void *v
)
650 if (v
== SEQ_START_TOKEN
)
651 seq_printf(seq
, "Inter-| sta-| Quality | Discarded "
652 "packets | Missed | WE\n"
653 " face | tus | link level noise | nwid "
654 "crypt frag retry misc | beacon | %d\n",
657 wireless_seq_printf_stats(seq
, v
);
661 static void *wireless_dev_seq_start(struct seq_file
*seq
, loff_t
*pos
)
663 struct net
*net
= seq_file_net(seq
);
665 struct net_device
*dev
;
669 return SEQ_START_TOKEN
;
672 for_each_netdev(net
, dev
)
678 static void *wireless_dev_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
680 struct net
*net
= seq_file_net(seq
);
684 return v
== SEQ_START_TOKEN
?
685 first_net_device(net
) : next_net_device(v
);
688 static void wireless_dev_seq_stop(struct seq_file
*seq
, void *v
)
693 static const struct seq_operations wireless_seq_ops
= {
694 .start
= wireless_dev_seq_start
,
695 .next
= wireless_dev_seq_next
,
696 .stop
= wireless_dev_seq_stop
,
697 .show
= wireless_dev_seq_show
,
700 static int seq_open_wireless(struct inode
*inode
, struct file
*file
)
702 return seq_open_net(inode
, file
, &wireless_seq_ops
,
703 sizeof(struct seq_net_private
));
706 static const struct file_operations wireless_seq_fops
= {
707 .owner
= THIS_MODULE
,
708 .open
= seq_open_wireless
,
711 .release
= seq_release_net
,
714 int wext_proc_init(struct net
*net
)
716 /* Create /proc/net/wireless entry */
717 if (!proc_net_fops_create(net
, "wireless", S_IRUGO
, &wireless_seq_fops
))
723 void wext_proc_exit(struct net
*net
)
725 proc_net_remove(net
, "wireless");
727 #endif /* CONFIG_PROC_FS */
729 /************************** IOCTL SUPPORT **************************/
731 * The original user space API to configure all those Wireless Extensions
733 * In there, we check if we need to call the new driver API (iw_handler)
734 * or just call the driver ioctl handler.
737 /* ---------------------------------------------------------------- */
738 static int ioctl_standard_iw_point(struct iw_point
*iwp
, unsigned int cmd
,
739 const struct iw_ioctl_description
*descr
,
740 iw_handler handler
, struct net_device
*dev
,
741 struct iw_request_info
*info
)
743 int err
, extra_size
, user_length
= 0, essid_compat
= 0;
746 /* Calculate space needed by arguments. Always allocate
749 extra_size
= descr
->max_tokens
* descr
->token_size
;
751 /* Check need for ESSID compatibility for WE < 21 */
757 if (iwp
->length
== descr
->max_tokens
+ 1)
759 else if (IW_IS_SET(cmd
) && (iwp
->length
!= 0)) {
760 char essid
[IW_ESSID_MAX_SIZE
+ 1];
762 err
= copy_from_user(essid
, iwp
->pointer
,
768 if (essid
[iwp
->length
- 1] == '\0')
776 iwp
->length
-= essid_compat
;
778 /* Check what user space is giving us */
779 if (IW_IS_SET(cmd
)) {
780 /* Check NULL pointer */
781 if (!iwp
->pointer
&& iwp
->length
!= 0)
783 /* Check if number of token fits within bounds */
784 if (iwp
->length
> descr
->max_tokens
)
786 if (iwp
->length
< descr
->min_tokens
)
789 /* Check NULL pointer */
792 /* Save user space buffer size for checking */
793 user_length
= iwp
->length
;
795 /* Don't check if user_length > max to allow forward
796 * compatibility. The test user_length < min is
797 * implied by the test at the end.
800 /* Support for very large requests */
801 if ((descr
->flags
& IW_DESCR_FLAG_NOMAX
) &&
802 (user_length
> descr
->max_tokens
)) {
803 /* Allow userspace to GET more than max so
804 * we can support any size GET requests.
805 * There is still a limit : -ENOMEM.
807 extra_size
= user_length
* descr
->token_size
;
809 /* Note : user_length is originally a __u16,
810 * and token_size is controlled by us,
811 * so extra_size won't get negative and
817 /* kzalloc() ensures NULL-termination for essid_compat. */
818 extra
= kzalloc(extra_size
, GFP_KERNEL
);
822 /* If it is a SET, get all the extra data in here */
823 if (IW_IS_SET(cmd
) && (iwp
->length
!= 0)) {
824 if (copy_from_user(extra
, iwp
->pointer
,
826 descr
->token_size
)) {
831 if (cmd
== SIOCSIWENCODEEXT
) {
832 struct iw_encode_ext
*ee
= (void *) extra
;
834 if (iwp
->length
< sizeof(*ee
) + ee
->key_len
)
839 err
= handler(dev
, info
, (union iwreq_data
*) iwp
, extra
);
841 iwp
->length
+= essid_compat
;
843 /* If we have something to return to the user */
844 if (!err
&& IW_IS_GET(cmd
)) {
845 /* Check if there is enough buffer up there */
846 if (user_length
< iwp
->length
) {
851 if (copy_to_user(iwp
->pointer
, extra
,
853 descr
->token_size
)) {
859 /* Generate an event to notify listeners of the change */
860 if ((descr
->flags
& IW_DESCR_FLAG_EVENT
) && err
== -EIWCOMMIT
) {
861 union iwreq_data
*data
= (union iwreq_data
*) iwp
;
863 if (descr
->flags
& IW_DESCR_FLAG_RESTRICT
)
864 /* If the event is restricted, don't
865 * export the payload.
867 wireless_send_event(dev
, cmd
, data
, NULL
);
869 wireless_send_event(dev
, cmd
, data
, extra
);
878 * Wrapper to call a standard Wireless Extension handler.
879 * We do various checks and also take care of moving data between
880 * user space and kernel space.
882 static int ioctl_standard_call(struct net_device
* dev
,
885 struct iw_request_info
*info
,
888 const struct iw_ioctl_description
* descr
;
891 /* Get the description of the IOCTL */
892 if ((cmd
- SIOCIWFIRST
) >= standard_ioctl_num
)
894 descr
= &(standard_ioctl
[cmd
- SIOCIWFIRST
]);
896 /* Check if we have a pointer to user space data or not */
897 if (descr
->header_type
!= IW_HEADER_TYPE_POINT
) {
899 /* No extra arguments. Trivial to handle */
900 ret
= handler(dev
, info
, &(iwr
->u
), NULL
);
902 /* Generate an event to notify listeners of the change */
903 if ((descr
->flags
& IW_DESCR_FLAG_EVENT
) &&
904 ((ret
== 0) || (ret
== -EIWCOMMIT
)))
905 wireless_send_event(dev
, cmd
, &(iwr
->u
), NULL
);
907 ret
= ioctl_standard_iw_point(&iwr
->u
.data
, cmd
, descr
,
911 /* Call commit handler if needed and defined */
912 if (ret
== -EIWCOMMIT
)
913 ret
= call_commit_handler(dev
);
915 /* Here, we will generate the appropriate event if needed */
920 /* ---------------------------------------------------------------- */
922 * Wrapper to call a private Wireless Extension handler.
923 * We do various checks and also take care of moving data between
924 * user space and kernel space.
925 * It's not as nice and slimline as the standard wrapper. The cause
926 * is struct iw_priv_args, which was not really designed for the
927 * job we are going here.
929 * IMPORTANT : This function prevent to set and get data on the same
930 * IOCTL and enforce the SET/GET convention. Not doing it would be
932 * If you need to set and get data at the same time, please don't use
933 * a iw_handler but process it in your ioctl handler (i.e. use the
936 static int get_priv_descr_and_size(struct net_device
*dev
, unsigned int cmd
,
937 const struct iw_priv_args
**descrp
)
939 const struct iw_priv_args
*descr
;
943 for (i
= 0; i
< dev
->wireless_handlers
->num_private_args
; i
++) {
944 if (cmd
== dev
->wireless_handlers
->private_args
[i
].cmd
) {
945 descr
= &dev
->wireless_handlers
->private_args
[i
];
952 if (IW_IS_SET(cmd
)) {
953 int offset
= 0; /* For sub-ioctls */
954 /* Check for sub-ioctl handler */
955 if (descr
->name
[0] == '\0')
956 /* Reserve one int for sub-ioctl index */
957 offset
= sizeof(__u32
);
959 /* Size of set arguments */
960 extra_size
= get_priv_size(descr
->set_args
);
962 /* Does it fits in iwr ? */
963 if ((descr
->set_args
& IW_PRIV_SIZE_FIXED
) &&
964 ((extra_size
+ offset
) <= IFNAMSIZ
))
967 /* Size of get arguments */
968 extra_size
= get_priv_size(descr
->get_args
);
970 /* Does it fits in iwr ? */
971 if ((descr
->get_args
& IW_PRIV_SIZE_FIXED
) &&
972 (extra_size
<= IFNAMSIZ
))
980 static int ioctl_private_iw_point(struct iw_point
*iwp
, unsigned int cmd
,
981 const struct iw_priv_args
*descr
,
982 iw_handler handler
, struct net_device
*dev
,
983 struct iw_request_info
*info
, int extra_size
)
988 /* Check what user space is giving us */
989 if (IW_IS_SET(cmd
)) {
990 if (!iwp
->pointer
&& iwp
->length
!= 0)
993 if (iwp
->length
> (descr
->set_args
& IW_PRIV_SIZE_MASK
))
995 } else if (!iwp
->pointer
)
998 extra
= kmalloc(extra_size
, GFP_KERNEL
);
1002 /* If it is a SET, get all the extra data in here */
1003 if (IW_IS_SET(cmd
) && (iwp
->length
!= 0)) {
1004 if (copy_from_user(extra
, iwp
->pointer
, extra_size
)) {
1010 /* Call the handler */
1011 err
= handler(dev
, info
, (union iwreq_data
*) iwp
, extra
);
1013 /* If we have something to return to the user */
1014 if (!err
&& IW_IS_GET(cmd
)) {
1015 /* Adjust for the actual length if it's variable,
1016 * avoid leaking kernel bits outside.
1018 if (!(descr
->get_args
& IW_PRIV_SIZE_FIXED
))
1019 extra_size
= adjust_priv_size(descr
->get_args
, iwp
);
1021 if (copy_to_user(iwp
->pointer
, extra
, extra_size
))
1030 static int ioctl_private_call(struct net_device
*dev
, struct iwreq
*iwr
,
1031 unsigned int cmd
, struct iw_request_info
*info
,
1034 int extra_size
= 0, ret
= -EINVAL
;
1035 const struct iw_priv_args
*descr
;
1037 extra_size
= get_priv_descr_and_size(dev
, cmd
, &descr
);
1039 /* Check if we have a pointer to user space data or not. */
1040 if (extra_size
== 0) {
1041 /* No extra arguments. Trivial to handle */
1042 ret
= handler(dev
, info
, &(iwr
->u
), (char *) &(iwr
->u
));
1044 ret
= ioctl_private_iw_point(&iwr
->u
.data
, cmd
, descr
,
1045 handler
, dev
, info
, extra_size
);
1048 /* Call commit handler if needed and defined */
1049 if (ret
== -EIWCOMMIT
)
1050 ret
= call_commit_handler(dev
);
1055 /* ---------------------------------------------------------------- */
1056 typedef int (*wext_ioctl_func
)(struct net_device
*, struct iwreq
*,
1057 unsigned int, struct iw_request_info
*,
1061 * Main IOCTl dispatcher.
1062 * Check the type of IOCTL and call the appropriate wrapper...
1064 static int wireless_process_ioctl(struct net
*net
, struct ifreq
*ifr
,
1066 struct iw_request_info
*info
,
1067 wext_ioctl_func standard
,
1068 wext_ioctl_func
private)
1070 struct iwreq
*iwr
= (struct iwreq
*) ifr
;
1071 struct net_device
*dev
;
1074 /* Permissions are already checked in dev_ioctl() before calling us.
1075 * The copy_to/from_user() of ifr is also dealt with in there */
1077 /* Make sure the device exist */
1078 if ((dev
= __dev_get_by_name(net
, ifr
->ifr_name
)) == NULL
)
1081 /* A bunch of special cases, then the generic case...
1082 * Note that 'cmd' is already filtered in dev_ioctl() with
1083 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
1084 if (cmd
== SIOCGIWSTATS
)
1085 return standard(dev
, iwr
, cmd
, info
,
1086 &iw_handler_get_iwstats
);
1088 if (cmd
== SIOCGIWPRIV
&& dev
->wireless_handlers
)
1089 return standard(dev
, iwr
, cmd
, info
,
1090 &iw_handler_get_private
);
1093 if (!netif_device_present(dev
))
1096 /* New driver API : try to find the handler */
1097 handler
= get_handler(dev
, cmd
);
1099 /* Standard and private are not the same */
1100 if (cmd
< SIOCIWFIRSTPRIV
)
1101 return standard(dev
, iwr
, cmd
, info
, handler
);
1103 return private(dev
, iwr
, cmd
, info
, handler
);
1105 /* Old driver API : call driver ioctl handler */
1106 if (dev
->netdev_ops
->ndo_do_ioctl
)
1107 return dev
->netdev_ops
->ndo_do_ioctl(dev
, ifr
, cmd
);
1111 /* If command is `set a parameter', or `get the encoding parameters',
1112 * check if the user has the right to do it.
1114 static int wext_permission_check(unsigned int cmd
)
1116 if ((IW_IS_SET(cmd
) || cmd
== SIOCGIWENCODE
|| cmd
== SIOCGIWENCODEEXT
)
1117 && !capable(CAP_NET_ADMIN
))
1123 /* entry point from dev ioctl */
1124 static int wext_ioctl_dispatch(struct net
*net
, struct ifreq
*ifr
,
1125 unsigned int cmd
, struct iw_request_info
*info
,
1126 wext_ioctl_func standard
,
1127 wext_ioctl_func
private)
1129 int ret
= wext_permission_check(cmd
);
1134 dev_load(net
, ifr
->ifr_name
);
1136 ret
= wireless_process_ioctl(net
, ifr
, cmd
, info
, standard
, private);
1142 int wext_handle_ioctl(struct net
*net
, struct ifreq
*ifr
, unsigned int cmd
,
1145 struct iw_request_info info
= { .cmd
= cmd
, .flags
= 0 };
1148 ret
= wext_ioctl_dispatch(net
, ifr
, cmd
, &info
,
1149 ioctl_standard_call
,
1150 ioctl_private_call
);
1153 copy_to_user(arg
, ifr
, sizeof(struct iwreq
)))
1159 #ifdef CONFIG_COMPAT
1160 static int compat_standard_call(struct net_device
*dev
,
1163 struct iw_request_info
*info
,
1166 const struct iw_ioctl_description
*descr
;
1167 struct compat_iw_point
*iwp_compat
;
1168 struct iw_point iwp
;
1171 descr
= standard_ioctl
+ (cmd
- SIOCIWFIRST
);
1173 if (descr
->header_type
!= IW_HEADER_TYPE_POINT
)
1174 return ioctl_standard_call(dev
, iwr
, cmd
, info
, handler
);
1176 iwp_compat
= (struct compat_iw_point
*) &iwr
->u
.data
;
1177 iwp
.pointer
= compat_ptr(iwp_compat
->pointer
);
1178 iwp
.length
= iwp_compat
->length
;
1179 iwp
.flags
= iwp_compat
->flags
;
1181 err
= ioctl_standard_iw_point(&iwp
, cmd
, descr
, handler
, dev
, info
);
1183 iwp_compat
->pointer
= ptr_to_compat(iwp
.pointer
);
1184 iwp_compat
->length
= iwp
.length
;
1185 iwp_compat
->flags
= iwp
.flags
;
1190 static int compat_private_call(struct net_device
*dev
, struct iwreq
*iwr
,
1191 unsigned int cmd
, struct iw_request_info
*info
,
1194 const struct iw_priv_args
*descr
;
1195 int ret
, extra_size
;
1197 extra_size
= get_priv_descr_and_size(dev
, cmd
, &descr
);
1199 /* Check if we have a pointer to user space data or not. */
1200 if (extra_size
== 0) {
1201 /* No extra arguments. Trivial to handle */
1202 ret
= handler(dev
, info
, &(iwr
->u
), (char *) &(iwr
->u
));
1204 struct compat_iw_point
*iwp_compat
;
1205 struct iw_point iwp
;
1207 iwp_compat
= (struct compat_iw_point
*) &iwr
->u
.data
;
1208 iwp
.pointer
= compat_ptr(iwp_compat
->pointer
);
1209 iwp
.length
= iwp_compat
->length
;
1210 iwp
.flags
= iwp_compat
->flags
;
1212 ret
= ioctl_private_iw_point(&iwp
, cmd
, descr
,
1213 handler
, dev
, info
, extra_size
);
1215 iwp_compat
->pointer
= ptr_to_compat(iwp
.pointer
);
1216 iwp_compat
->length
= iwp
.length
;
1217 iwp_compat
->flags
= iwp
.flags
;
1220 /* Call commit handler if needed and defined */
1221 if (ret
== -EIWCOMMIT
)
1222 ret
= call_commit_handler(dev
);
1227 int compat_wext_handle_ioctl(struct net
*net
, unsigned int cmd
,
1230 void __user
*argp
= (void __user
*)arg
;
1231 struct iw_request_info info
;
1236 if (copy_from_user(&iwr
, argp
, sizeof(struct iwreq
)))
1239 iwr
.ifr_name
[IFNAMSIZ
-1] = 0;
1240 colon
= strchr(iwr
.ifr_name
, ':');
1245 info
.flags
= IW_REQUEST_FLAG_COMPAT
;
1247 ret
= wext_ioctl_dispatch(net
, (struct ifreq
*) &iwr
, cmd
, &info
,
1248 compat_standard_call
,
1249 compat_private_call
);
1253 copy_to_user(argp
, &iwr
, sizeof(struct iwreq
)))
1260 static int __net_init
wext_pernet_init(struct net
*net
)
1262 skb_queue_head_init(&net
->wext_nlevents
);
1266 static void __net_exit
wext_pernet_exit(struct net
*net
)
1268 skb_queue_purge(&net
->wext_nlevents
);
1271 static struct pernet_operations wext_pernet_ops
= {
1272 .init
= wext_pernet_init
,
1273 .exit
= wext_pernet_exit
,
1276 static int __init
wireless_nlevent_init(void)
1278 return register_pernet_subsys(&wext_pernet_ops
);
1282 subsys_initcall(wireless_nlevent_init
);
1284 /* Process events generated by the wireless layer or the driver. */
1285 static void wireless_nlevent_process(struct work_struct
*work
)
1287 struct sk_buff
*skb
;
1293 while ((skb
= skb_dequeue(&net
->wext_nlevents
)))
1294 rtnl_notify(skb
, net
, 0, RTNLGRP_LINK
, NULL
,
1301 static DECLARE_WORK(wireless_nlevent_work
, wireless_nlevent_process
);
1303 /* ---------------------------------------------------------------- */
1305 * Fill a rtnetlink message with our event data.
1306 * Note that we propage only the specified event and don't dump the
1307 * current wireless config. Dumping the wireless config is far too
1308 * expensive (for each parameter, the driver need to query the hardware).
1310 static int rtnetlink_fill_iwinfo(struct sk_buff
*skb
, struct net_device
*dev
,
1311 int type
, char *event
, int event_len
)
1313 struct ifinfomsg
*r
;
1314 struct nlmsghdr
*nlh
;
1316 nlh
= nlmsg_put(skb
, 0, 0, type
, sizeof(*r
), 0);
1320 r
= nlmsg_data(nlh
);
1321 r
->ifi_family
= AF_UNSPEC
;
1323 r
->ifi_type
= dev
->type
;
1324 r
->ifi_index
= dev
->ifindex
;
1325 r
->ifi_flags
= dev_get_flags(dev
);
1326 r
->ifi_change
= 0; /* Wireless changes don't affect those flags */
1328 NLA_PUT_STRING(skb
, IFLA_IFNAME
, dev
->name
);
1329 /* Add the wireless events in the netlink packet */
1330 NLA_PUT(skb
, IFLA_WIRELESS
, event_len
, event
);
1332 return nlmsg_end(skb
, nlh
);
1335 nlmsg_cancel(skb
, nlh
);
1339 /* ---------------------------------------------------------------- */
1341 * Create and broadcast and send it on the standard rtnetlink socket
1342 * This is a pure clone rtmsg_ifinfo() in net/core/rtnetlink.c
1343 * Andrzej Krzysztofowicz mandated that I used a IFLA_XXX field
1344 * within a RTM_NEWLINK event.
1346 static void rtmsg_iwinfo(struct net_device
*dev
, char *event
, int event_len
)
1348 struct sk_buff
*skb
;
1351 skb
= nlmsg_new(NLMSG_DEFAULT_SIZE
, GFP_ATOMIC
);
1355 err
= rtnetlink_fill_iwinfo(skb
, dev
, RTM_NEWLINK
, event
, event_len
);
1357 WARN_ON(err
== -EMSGSIZE
);
1362 NETLINK_CB(skb
).dst_group
= RTNLGRP_LINK
;
1363 skb_queue_tail(&dev_net(dev
)->wext_nlevents
, skb
);
1364 schedule_work(&wireless_nlevent_work
);
1367 /* ---------------------------------------------------------------- */
1369 * Main event dispatcher. Called from other parts and drivers.
1370 * Send the event on the appropriate channels.
1371 * May be called from interrupt context.
1373 void wireless_send_event(struct net_device
* dev
,
1375 union iwreq_data
* wrqu
,
1378 const struct iw_ioctl_description
* descr
= NULL
;
1380 struct iw_event
*event
; /* Mallocated whole event */
1381 int event_len
; /* Its size */
1382 int hdr_len
; /* Size of the event header */
1383 int wrqu_off
= 0; /* Offset in wrqu */
1384 /* Don't "optimise" the following variable, it will crash */
1385 unsigned cmd_index
; /* *MUST* be unsigned */
1387 /* Get the description of the Event */
1388 if (cmd
<= SIOCIWLAST
) {
1389 cmd_index
= cmd
- SIOCIWFIRST
;
1390 if (cmd_index
< standard_ioctl_num
)
1391 descr
= &(standard_ioctl
[cmd_index
]);
1393 cmd_index
= cmd
- IWEVFIRST
;
1394 if (cmd_index
< standard_event_num
)
1395 descr
= &(standard_event
[cmd_index
]);
1397 /* Don't accept unknown events */
1398 if (descr
== NULL
) {
1399 /* Note : we don't return an error to the driver, because
1400 * the driver would not know what to do about it. It can't
1401 * return an error to the user, because the event is not
1402 * initiated by a user request.
1403 * The best the driver could do is to log an error message.
1404 * We will do it ourselves instead...
1406 printk(KERN_ERR
"%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
1411 /* Check extra parameters and set extra_len */
1412 if (descr
->header_type
== IW_HEADER_TYPE_POINT
) {
1413 /* Check if number of token fits within bounds */
1414 if (wrqu
->data
.length
> descr
->max_tokens
) {
1415 printk(KERN_ERR
"%s (WE) : Wireless Event too big (%d)\n", dev
->name
, wrqu
->data
.length
);
1418 if (wrqu
->data
.length
< descr
->min_tokens
) {
1419 printk(KERN_ERR
"%s (WE) : Wireless Event too small (%d)\n", dev
->name
, wrqu
->data
.length
);
1422 /* Calculate extra_len - extra is NULL for restricted events */
1424 extra_len
= wrqu
->data
.length
* descr
->token_size
;
1425 /* Always at an offset in wrqu */
1426 wrqu_off
= IW_EV_POINT_OFF
;
1429 /* Total length of the event */
1430 hdr_len
= event_type_size
[descr
->header_type
];
1431 event_len
= hdr_len
+ extra_len
;
1433 /* Create temporary buffer to hold the event */
1434 event
= kmalloc(event_len
, GFP_ATOMIC
);
1439 event
->len
= event_len
;
1441 memcpy(&event
->u
, ((char *) wrqu
) + wrqu_off
, hdr_len
- IW_EV_LCP_LEN
);
1443 memcpy(((char *) event
) + hdr_len
, extra
, extra_len
);
1445 /* Send via the RtNetlink event channel */
1446 rtmsg_iwinfo(dev
, (char *) event
, event_len
);
1451 return; /* Always success, I guess ;-) */
1453 EXPORT_SYMBOL(wireless_send_event
);
1455 /********************** ENHANCED IWSPY SUPPORT **********************/
1457 * In the old days, the driver was handling spy support all by itself.
1458 * Now, the driver can delegate this task to Wireless Extensions.
1459 * It needs to use those standard spy iw_handler in struct iw_handler_def,
1460 * push data to us via wireless_spy_update() and include struct iw_spy_data
1461 * in its private part (and export it in net_device->wireless_data->spy_data).
1462 * One of the main advantage of centralising spy support here is that
1463 * it becomes much easier to improve and extend it without having to touch
1464 * the drivers. One example is the addition of the Spy-Threshold events.
1467 /* ---------------------------------------------------------------- */
1469 * Return the pointer to the spy data in the driver.
1470 * Because this is called on the Rx path via wireless_spy_update(),
1471 * we want it to be efficient...
1473 static inline struct iw_spy_data
*get_spydata(struct net_device
*dev
)
1475 /* This is the new way */
1476 if (dev
->wireless_data
)
1477 return dev
->wireless_data
->spy_data
;
1481 /*------------------------------------------------------------------*/
1483 * Standard Wireless Handler : set Spy List
1485 int iw_handler_set_spy(struct net_device
* dev
,
1486 struct iw_request_info
* info
,
1487 union iwreq_data
* wrqu
,
1490 struct iw_spy_data
* spydata
= get_spydata(dev
);
1491 struct sockaddr
* address
= (struct sockaddr
*) extra
;
1493 /* Make sure driver is not buggy or using the old API */
1497 /* Disable spy collection while we copy the addresses.
1498 * While we copy addresses, any call to wireless_spy_update()
1499 * will NOP. This is OK, as anyway the addresses are changing. */
1500 spydata
->spy_number
= 0;
1502 /* We want to operate without locking, because wireless_spy_update()
1503 * most likely will happen in the interrupt handler, and therefore
1504 * have its own locking constraints and needs performance.
1505 * The rtnl_lock() make sure we don't race with the other iw_handlers.
1506 * This make sure wireless_spy_update() "see" that the spy list
1507 * is temporarily disabled. */
1510 /* Are there are addresses to copy? */
1511 if (wrqu
->data
.length
> 0) {
1514 /* Copy addresses */
1515 for (i
= 0; i
< wrqu
->data
.length
; i
++)
1516 memcpy(spydata
->spy_address
[i
], address
[i
].sa_data
,
1519 memset(spydata
->spy_stat
, 0,
1520 sizeof(struct iw_quality
) * IW_MAX_SPY
);
1523 /* Make sure above is updated before re-enabling */
1526 /* Enable addresses */
1527 spydata
->spy_number
= wrqu
->data
.length
;
1531 EXPORT_SYMBOL(iw_handler_set_spy
);
1533 /*------------------------------------------------------------------*/
1535 * Standard Wireless Handler : get Spy List
1537 int iw_handler_get_spy(struct net_device
* dev
,
1538 struct iw_request_info
* info
,
1539 union iwreq_data
* wrqu
,
1542 struct iw_spy_data
* spydata
= get_spydata(dev
);
1543 struct sockaddr
* address
= (struct sockaddr
*) extra
;
1546 /* Make sure driver is not buggy or using the old API */
1550 wrqu
->data
.length
= spydata
->spy_number
;
1552 /* Copy addresses. */
1553 for (i
= 0; i
< spydata
->spy_number
; i
++) {
1554 memcpy(address
[i
].sa_data
, spydata
->spy_address
[i
], ETH_ALEN
);
1555 address
[i
].sa_family
= AF_UNIX
;
1557 /* Copy stats to the user buffer (just after). */
1558 if (spydata
->spy_number
> 0)
1559 memcpy(extra
+ (sizeof(struct sockaddr
) *spydata
->spy_number
),
1561 sizeof(struct iw_quality
) * spydata
->spy_number
);
1562 /* Reset updated flags. */
1563 for (i
= 0; i
< spydata
->spy_number
; i
++)
1564 spydata
->spy_stat
[i
].updated
&= ~IW_QUAL_ALL_UPDATED
;
1567 EXPORT_SYMBOL(iw_handler_get_spy
);
1569 /*------------------------------------------------------------------*/
1571 * Standard Wireless Handler : set spy threshold
1573 int iw_handler_set_thrspy(struct net_device
* dev
,
1574 struct iw_request_info
*info
,
1575 union iwreq_data
* wrqu
,
1578 struct iw_spy_data
* spydata
= get_spydata(dev
);
1579 struct iw_thrspy
* threshold
= (struct iw_thrspy
*) extra
;
1581 /* Make sure driver is not buggy or using the old API */
1586 memcpy(&(spydata
->spy_thr_low
), &(threshold
->low
),
1587 2 * sizeof(struct iw_quality
));
1590 memset(spydata
->spy_thr_under
, '\0', sizeof(spydata
->spy_thr_under
));
1594 EXPORT_SYMBOL(iw_handler_set_thrspy
);
1596 /*------------------------------------------------------------------*/
1598 * Standard Wireless Handler : get spy threshold
1600 int iw_handler_get_thrspy(struct net_device
* dev
,
1601 struct iw_request_info
*info
,
1602 union iwreq_data
* wrqu
,
1605 struct iw_spy_data
* spydata
= get_spydata(dev
);
1606 struct iw_thrspy
* threshold
= (struct iw_thrspy
*) extra
;
1608 /* Make sure driver is not buggy or using the old API */
1613 memcpy(&(threshold
->low
), &(spydata
->spy_thr_low
),
1614 2 * sizeof(struct iw_quality
));
1618 EXPORT_SYMBOL(iw_handler_get_thrspy
);
1620 /*------------------------------------------------------------------*/
1622 * Prepare and send a Spy Threshold event
1624 static void iw_send_thrspy_event(struct net_device
* dev
,
1625 struct iw_spy_data
* spydata
,
1626 unsigned char * address
,
1627 struct iw_quality
* wstats
)
1629 union iwreq_data wrqu
;
1630 struct iw_thrspy threshold
;
1633 wrqu
.data
.length
= 1;
1634 wrqu
.data
.flags
= 0;
1636 memcpy(threshold
.addr
.sa_data
, address
, ETH_ALEN
);
1637 threshold
.addr
.sa_family
= ARPHRD_ETHER
;
1639 memcpy(&(threshold
.qual
), wstats
, sizeof(struct iw_quality
));
1640 /* Copy also thresholds */
1641 memcpy(&(threshold
.low
), &(spydata
->spy_thr_low
),
1642 2 * sizeof(struct iw_quality
));
1644 /* Send event to user space */
1645 wireless_send_event(dev
, SIOCGIWTHRSPY
, &wrqu
, (char *) &threshold
);
1648 /* ---------------------------------------------------------------- */
1650 * Call for the driver to update the spy data.
1651 * For now, the spy data is a simple array. As the size of the array is
1652 * small, this is good enough. If we wanted to support larger number of
1653 * spy addresses, we should use something more efficient...
1655 void wireless_spy_update(struct net_device
* dev
,
1656 unsigned char * address
,
1657 struct iw_quality
* wstats
)
1659 struct iw_spy_data
* spydata
= get_spydata(dev
);
1663 /* Make sure driver is not buggy or using the old API */
1667 /* Update all records that match */
1668 for (i
= 0; i
< spydata
->spy_number
; i
++)
1669 if (!compare_ether_addr(address
, spydata
->spy_address
[i
])) {
1670 memcpy(&(spydata
->spy_stat
[i
]), wstats
,
1671 sizeof(struct iw_quality
));
1675 /* Generate an event if we cross the spy threshold.
1676 * To avoid event storms, we have a simple hysteresis : we generate
1677 * event only when we go under the low threshold or above the
1678 * high threshold. */
1680 if (spydata
->spy_thr_under
[match
]) {
1681 if (wstats
->level
> spydata
->spy_thr_high
.level
) {
1682 spydata
->spy_thr_under
[match
] = 0;
1683 iw_send_thrspy_event(dev
, spydata
,
1687 if (wstats
->level
< spydata
->spy_thr_low
.level
) {
1688 spydata
->spy_thr_under
[match
] = 1;
1689 iw_send_thrspy_event(dev
, spydata
,
1695 EXPORT_SYMBOL(wireless_spy_update
);