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spi-topcliff-pch: Fix issue for transmitting over 4KByte
[zen-stable.git] / net / wireless / wext-core.c
blob0af7f54e4f617f04c7dbab24e09a6b53fc4c9dd2
1 /*
2 * This file implement the Wireless Extensions core API.
3 *
4 * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
5 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
6 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
7 *
8 * (As all part of the Linux kernel, this file is GPL)
9 */
10 #include <linux/kernel.h>
11 #include <linux/netdevice.h>
12 #include <linux/rtnetlink.h>
13 #include <linux/slab.h>
14 #include <linux/wireless.h>
15 #include <linux/uaccess.h>
16 #include <linux/export.h>
17 #include <net/cfg80211.h>
18 #include <net/iw_handler.h>
19 #include <net/netlink.h>
20 #include <net/wext.h>
21 #include <net/net_namespace.h>
22
23 typedef int (*wext_ioctl_func)(struct net_device *, struct iwreq *,
24 unsigned int, struct iw_request_info *,
25 iw_handler);
26
27
28 /*
29 * Meta-data about all the standard Wireless Extension request we
30 * know about.
31 */
32 static const struct iw_ioctl_description standard_ioctl[] = {
33 [IW_IOCTL_IDX(SIOCSIWCOMMIT)] = {
34 .header_type = IW_HEADER_TYPE_NULL,
35 },
36 [IW_IOCTL_IDX(SIOCGIWNAME)] = {
37 .header_type = IW_HEADER_TYPE_CHAR,
38 .flags = IW_DESCR_FLAG_DUMP,
39 },
40 [IW_IOCTL_IDX(SIOCSIWNWID)] = {
41 .header_type = IW_HEADER_TYPE_PARAM,
42 .flags = IW_DESCR_FLAG_EVENT,
43 },
44 [IW_IOCTL_IDX(SIOCGIWNWID)] = {
45 .header_type = IW_HEADER_TYPE_PARAM,
46 .flags = IW_DESCR_FLAG_DUMP,
47 },
48 [IW_IOCTL_IDX(SIOCSIWFREQ)] = {
49 .header_type = IW_HEADER_TYPE_FREQ,
50 .flags = IW_DESCR_FLAG_EVENT,
51 },
52 [IW_IOCTL_IDX(SIOCGIWFREQ)] = {
53 .header_type = IW_HEADER_TYPE_FREQ,
54 .flags = IW_DESCR_FLAG_DUMP,
55 },
56 [IW_IOCTL_IDX(SIOCSIWMODE)] = {
57 .header_type = IW_HEADER_TYPE_UINT,
58 .flags = IW_DESCR_FLAG_EVENT,
59 },
60 [IW_IOCTL_IDX(SIOCGIWMODE)] = {
61 .header_type = IW_HEADER_TYPE_UINT,
62 .flags = IW_DESCR_FLAG_DUMP,
63 },
64 [IW_IOCTL_IDX(SIOCSIWSENS)] = {
65 .header_type = IW_HEADER_TYPE_PARAM,
66 },
67 [IW_IOCTL_IDX(SIOCGIWSENS)] = {
68 .header_type = IW_HEADER_TYPE_PARAM,
69 },
70 [IW_IOCTL_IDX(SIOCSIWRANGE)] = {
71 .header_type = IW_HEADER_TYPE_NULL,
72 },
73 [IW_IOCTL_IDX(SIOCGIWRANGE)] = {
74 .header_type = IW_HEADER_TYPE_POINT,
75 .token_size = 1,
76 .max_tokens = sizeof(struct iw_range),
77 .flags = IW_DESCR_FLAG_DUMP,
78 },
79 [IW_IOCTL_IDX(SIOCSIWPRIV)] = {
80 .header_type = IW_HEADER_TYPE_NULL,
81 },
82 [IW_IOCTL_IDX(SIOCGIWPRIV)] = { /* (handled directly by us) */
83 .header_type = IW_HEADER_TYPE_POINT,
84 .token_size = sizeof(struct iw_priv_args),
85 .max_tokens = 16,
86 .flags = IW_DESCR_FLAG_NOMAX,
87 },
88 [IW_IOCTL_IDX(SIOCSIWSTATS)] = {
89 .header_type = IW_HEADER_TYPE_NULL,
90 },
91 [IW_IOCTL_IDX(SIOCGIWSTATS)] = { /* (handled directly by us) */
92 .header_type = IW_HEADER_TYPE_POINT,
93 .token_size = 1,
94 .max_tokens = sizeof(struct iw_statistics),
95 .flags = IW_DESCR_FLAG_DUMP,
96 },
97 [IW_IOCTL_IDX(SIOCSIWSPY)] = {
98 .header_type = IW_HEADER_TYPE_POINT,
99 .token_size = sizeof(struct sockaddr),
100 .max_tokens = IW_MAX_SPY,
101 },
102 [IW_IOCTL_IDX(SIOCGIWSPY)] = {
103 .header_type = IW_HEADER_TYPE_POINT,
104 .token_size = sizeof(struct sockaddr) +
105 sizeof(struct iw_quality),
106 .max_tokens = IW_MAX_SPY,
107 },
108 [IW_IOCTL_IDX(SIOCSIWTHRSPY)] = {
109 .header_type = IW_HEADER_TYPE_POINT,
110 .token_size = sizeof(struct iw_thrspy),
111 .min_tokens = 1,
112 .max_tokens = 1,
113 },
114 [IW_IOCTL_IDX(SIOCGIWTHRSPY)] = {
115 .header_type = IW_HEADER_TYPE_POINT,
116 .token_size = sizeof(struct iw_thrspy),
117 .min_tokens = 1,
118 .max_tokens = 1,
119 },
120 [IW_IOCTL_IDX(SIOCSIWAP)] = {
121 .header_type = IW_HEADER_TYPE_ADDR,
122 },
123 [IW_IOCTL_IDX(SIOCGIWAP)] = {
124 .header_type = IW_HEADER_TYPE_ADDR,
125 .flags = IW_DESCR_FLAG_DUMP,
126 },
127 [IW_IOCTL_IDX(SIOCSIWMLME)] = {
128 .header_type = IW_HEADER_TYPE_POINT,
129 .token_size = 1,
130 .min_tokens = sizeof(struct iw_mlme),
131 .max_tokens = sizeof(struct iw_mlme),
132 },
133 [IW_IOCTL_IDX(SIOCGIWAPLIST)] = {
134 .header_type = IW_HEADER_TYPE_POINT,
135 .token_size = sizeof(struct sockaddr) +
136 sizeof(struct iw_quality),
137 .max_tokens = IW_MAX_AP,
138 .flags = IW_DESCR_FLAG_NOMAX,
139 },
140 [IW_IOCTL_IDX(SIOCSIWSCAN)] = {
141 .header_type = IW_HEADER_TYPE_POINT,
142 .token_size = 1,
143 .min_tokens = 0,
144 .max_tokens = sizeof(struct iw_scan_req),
145 },
146 [IW_IOCTL_IDX(SIOCGIWSCAN)] = {
147 .header_type = IW_HEADER_TYPE_POINT,
148 .token_size = 1,
149 .max_tokens = IW_SCAN_MAX_DATA,
150 .flags = IW_DESCR_FLAG_NOMAX,
151 },
152 [IW_IOCTL_IDX(SIOCSIWESSID)] = {
153 .header_type = IW_HEADER_TYPE_POINT,
154 .token_size = 1,
155 .max_tokens = IW_ESSID_MAX_SIZE,
156 .flags = IW_DESCR_FLAG_EVENT,
157 },
158 [IW_IOCTL_IDX(SIOCGIWESSID)] = {
159 .header_type = IW_HEADER_TYPE_POINT,
160 .token_size = 1,
161 .max_tokens = IW_ESSID_MAX_SIZE,
162 .flags = IW_DESCR_FLAG_DUMP,
163 },
164 [IW_IOCTL_IDX(SIOCSIWNICKN)] = {
165 .header_type = IW_HEADER_TYPE_POINT,
166 .token_size = 1,
167 .max_tokens = IW_ESSID_MAX_SIZE,
168 },
169 [IW_IOCTL_IDX(SIOCGIWNICKN)] = {
170 .header_type = IW_HEADER_TYPE_POINT,
171 .token_size = 1,
172 .max_tokens = IW_ESSID_MAX_SIZE,
173 },
174 [IW_IOCTL_IDX(SIOCSIWRATE)] = {
175 .header_type = IW_HEADER_TYPE_PARAM,
176 },
177 [IW_IOCTL_IDX(SIOCGIWRATE)] = {
178 .header_type = IW_HEADER_TYPE_PARAM,
179 },
180 [IW_IOCTL_IDX(SIOCSIWRTS)] = {
181 .header_type = IW_HEADER_TYPE_PARAM,
182 },
183 [IW_IOCTL_IDX(SIOCGIWRTS)] = {
184 .header_type = IW_HEADER_TYPE_PARAM,
185 },
186 [IW_IOCTL_IDX(SIOCSIWFRAG)] = {
187 .header_type = IW_HEADER_TYPE_PARAM,
188 },
189 [IW_IOCTL_IDX(SIOCGIWFRAG)] = {
190 .header_type = IW_HEADER_TYPE_PARAM,
191 },
192 [IW_IOCTL_IDX(SIOCSIWTXPOW)] = {
193 .header_type = IW_HEADER_TYPE_PARAM,
194 },
195 [IW_IOCTL_IDX(SIOCGIWTXPOW)] = {
196 .header_type = IW_HEADER_TYPE_PARAM,
197 },
198 [IW_IOCTL_IDX(SIOCSIWRETRY)] = {
199 .header_type = IW_HEADER_TYPE_PARAM,
200 },
201 [IW_IOCTL_IDX(SIOCGIWRETRY)] = {
202 .header_type = IW_HEADER_TYPE_PARAM,
203 },
204 [IW_IOCTL_IDX(SIOCSIWENCODE)] = {
205 .header_type = IW_HEADER_TYPE_POINT,
206 .token_size = 1,
207 .max_tokens = IW_ENCODING_TOKEN_MAX,
208 .flags = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
209 },
210 [IW_IOCTL_IDX(SIOCGIWENCODE)] = {
211 .header_type = IW_HEADER_TYPE_POINT,
212 .token_size = 1,
213 .max_tokens = IW_ENCODING_TOKEN_MAX,
214 .flags = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
215 },
216 [IW_IOCTL_IDX(SIOCSIWPOWER)] = {
217 .header_type = IW_HEADER_TYPE_PARAM,
218 },
219 [IW_IOCTL_IDX(SIOCGIWPOWER)] = {
220 .header_type = IW_HEADER_TYPE_PARAM,
221 },
222 [IW_IOCTL_IDX(SIOCSIWGENIE)] = {
223 .header_type = IW_HEADER_TYPE_POINT,
224 .token_size = 1,
225 .max_tokens = IW_GENERIC_IE_MAX,
226 },
227 [IW_IOCTL_IDX(SIOCGIWGENIE)] = {
228 .header_type = IW_HEADER_TYPE_POINT,
229 .token_size = 1,
230 .max_tokens = IW_GENERIC_IE_MAX,
231 },
232 [IW_IOCTL_IDX(SIOCSIWAUTH)] = {
233 .header_type = IW_HEADER_TYPE_PARAM,
234 },
235 [IW_IOCTL_IDX(SIOCGIWAUTH)] = {
236 .header_type = IW_HEADER_TYPE_PARAM,
237 },
238 [IW_IOCTL_IDX(SIOCSIWENCODEEXT)] = {
239 .header_type = IW_HEADER_TYPE_POINT,
240 .token_size = 1,
241 .min_tokens = sizeof(struct iw_encode_ext),
242 .max_tokens = sizeof(struct iw_encode_ext) +
243 IW_ENCODING_TOKEN_MAX,
244 },
245 [IW_IOCTL_IDX(SIOCGIWENCODEEXT)] = {
246 .header_type = IW_HEADER_TYPE_POINT,
247 .token_size = 1,
248 .min_tokens = sizeof(struct iw_encode_ext),
249 .max_tokens = sizeof(struct iw_encode_ext) +
250 IW_ENCODING_TOKEN_MAX,
251 },
252 [IW_IOCTL_IDX(SIOCSIWPMKSA)] = {
253 .header_type = IW_HEADER_TYPE_POINT,
254 .token_size = 1,
255 .min_tokens = sizeof(struct iw_pmksa),
256 .max_tokens = sizeof(struct iw_pmksa),
257 },
258 };
259 static const unsigned standard_ioctl_num = ARRAY_SIZE(standard_ioctl);
260
261 /*
262 * Meta-data about all the additional standard Wireless Extension events
263 * we know about.
264 */
265 static const struct iw_ioctl_description standard_event[] = {
266 [IW_EVENT_IDX(IWEVTXDROP)] = {
267 .header_type = IW_HEADER_TYPE_ADDR,
268 },
269 [IW_EVENT_IDX(IWEVQUAL)] = {
270 .header_type = IW_HEADER_TYPE_QUAL,
271 },
272 [IW_EVENT_IDX(IWEVCUSTOM)] = {
273 .header_type = IW_HEADER_TYPE_POINT,
274 .token_size = 1,
275 .max_tokens = IW_CUSTOM_MAX,
276 },
277 [IW_EVENT_IDX(IWEVREGISTERED)] = {
278 .header_type = IW_HEADER_TYPE_ADDR,
279 },
280 [IW_EVENT_IDX(IWEVEXPIRED)] = {
281 .header_type = IW_HEADER_TYPE_ADDR,
282 },
283 [IW_EVENT_IDX(IWEVGENIE)] = {
284 .header_type = IW_HEADER_TYPE_POINT,
285 .token_size = 1,
286 .max_tokens = IW_GENERIC_IE_MAX,
287 },
288 [IW_EVENT_IDX(IWEVMICHAELMICFAILURE)] = {
289 .header_type = IW_HEADER_TYPE_POINT,
290 .token_size = 1,
291 .max_tokens = sizeof(struct iw_michaelmicfailure),
292 },
293 [IW_EVENT_IDX(IWEVASSOCREQIE)] = {
294 .header_type = IW_HEADER_TYPE_POINT,
295 .token_size = 1,
296 .max_tokens = IW_GENERIC_IE_MAX,
297 },
298 [IW_EVENT_IDX(IWEVASSOCRESPIE)] = {
299 .header_type = IW_HEADER_TYPE_POINT,
300 .token_size = 1,
301 .max_tokens = IW_GENERIC_IE_MAX,
302 },
303 [IW_EVENT_IDX(IWEVPMKIDCAND)] = {
304 .header_type = IW_HEADER_TYPE_POINT,
305 .token_size = 1,
306 .max_tokens = sizeof(struct iw_pmkid_cand),
307 },
308 };
309 static const unsigned standard_event_num = ARRAY_SIZE(standard_event);
310
311 /* Size (in bytes) of various events */
312 static const int event_type_size[] = {
313 IW_EV_LCP_LEN, /* IW_HEADER_TYPE_NULL */
314 0,
315 IW_EV_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
316 0,
317 IW_EV_UINT_LEN, /* IW_HEADER_TYPE_UINT */
318 IW_EV_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
319 IW_EV_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
320 0,
321 IW_EV_POINT_LEN, /* Without variable payload */
322 IW_EV_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
323 IW_EV_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
324 };
325
326 #ifdef CONFIG_COMPAT
327 static const int compat_event_type_size[] = {
328 IW_EV_COMPAT_LCP_LEN, /* IW_HEADER_TYPE_NULL */
329 0,
330 IW_EV_COMPAT_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
331 0,
332 IW_EV_COMPAT_UINT_LEN, /* IW_HEADER_TYPE_UINT */
333 IW_EV_COMPAT_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
334 IW_EV_COMPAT_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
335 0,
336 IW_EV_COMPAT_POINT_LEN, /* Without variable payload */
337 IW_EV_COMPAT_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
338 IW_EV_COMPAT_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
339 };
340 #endif
341
342
343 /* IW event code */
344
345 static int __net_init wext_pernet_init(struct net *net)
346 {
347 skb_queue_head_init(&net->wext_nlevents);
348 return 0;
349 }
350
351 static void __net_exit wext_pernet_exit(struct net *net)
352 {
353 skb_queue_purge(&net->wext_nlevents);
354 }
355
356 static struct pernet_operations wext_pernet_ops = {
357 .init = wext_pernet_init,
358 .exit = wext_pernet_exit,
359 };
360
361 static int __init wireless_nlevent_init(void)
362 {
363 return register_pernet_subsys(&wext_pernet_ops);
364 }
365
366 subsys_initcall(wireless_nlevent_init);
367
368 /* Process events generated by the wireless layer or the driver. */
369 static void wireless_nlevent_process(struct work_struct *work)
370 {
371 struct sk_buff *skb;
372 struct net *net;
373
374 rtnl_lock();
375
376 for_each_net(net) {
377 while ((skb = skb_dequeue(&net->wext_nlevents)))
378 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL,
379 GFP_KERNEL);
380 }
381
382 rtnl_unlock();
383 }
384
385 static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
386
387 static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
388 struct sk_buff *skb)
389 {
390 struct ifinfomsg *r;
391 struct nlmsghdr *nlh;
392
393 nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
394 if (!nlh)
395 return NULL;
396
397 r = nlmsg_data(nlh);
398 r->ifi_family = AF_UNSPEC;
399 r->__ifi_pad = 0;
400 r->ifi_type = dev->type;
401 r->ifi_index = dev->ifindex;
402 r->ifi_flags = dev_get_flags(dev);
403 r->ifi_change = 0; /* Wireless changes don't affect those flags */
404
405 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
406
407 return nlh;
408 nla_put_failure:
409 nlmsg_cancel(skb, nlh);
410 return NULL;
411 }
412
413
414 /*
415 * Main event dispatcher. Called from other parts and drivers.
416 * Send the event on the appropriate channels.
417 * May be called from interrupt context.
418 */
419 void wireless_send_event(struct net_device * dev,
420 unsigned int cmd,
421 union iwreq_data * wrqu,
422 const char * extra)
423 {
424 const struct iw_ioctl_description * descr = NULL;
425 int extra_len = 0;
426 struct iw_event *event; /* Mallocated whole event */
427 int event_len; /* Its size */
428 int hdr_len; /* Size of the event header */
429 int wrqu_off = 0; /* Offset in wrqu */
430 /* Don't "optimise" the following variable, it will crash */
431 unsigned cmd_index; /* *MUST* be unsigned */
432 struct sk_buff *skb;
433 struct nlmsghdr *nlh;
434 struct nlattr *nla;
435 #ifdef CONFIG_COMPAT
436 struct __compat_iw_event *compat_event;
437 struct compat_iw_point compat_wrqu;
438 struct sk_buff *compskb;
439 #endif
440
441 /*
442 * Nothing in the kernel sends scan events with data, be safe.
443 * This is necessary because we cannot fix up scan event data
444 * for compat, due to being contained in 'extra', but normally
445 * applications are required to retrieve the scan data anyway
446 * and no data is included in the event, this codifies that
447 * practice.
448 */
449 if (WARN_ON(cmd == SIOCGIWSCAN && extra))
450 extra = NULL;
451
452 /* Get the description of the Event */
453 if (cmd <= SIOCIWLAST) {
454 cmd_index = IW_IOCTL_IDX(cmd);
455 if (cmd_index < standard_ioctl_num)
456 descr = &(standard_ioctl[cmd_index]);
457 } else {
458 cmd_index = IW_EVENT_IDX(cmd);
459 if (cmd_index < standard_event_num)
460 descr = &(standard_event[cmd_index]);
461 }
462 /* Don't accept unknown events */
463 if (descr == NULL) {
464 /* Note : we don't return an error to the driver, because
465 * the driver would not know what to do about it. It can't
466 * return an error to the user, because the event is not
467 * initiated by a user request.
468 * The best the driver could do is to log an error message.
469 * We will do it ourselves instead...
470 */
471 netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
472 cmd);
473 return;
474 }
475
476 /* Check extra parameters and set extra_len */
477 if (descr->header_type == IW_HEADER_TYPE_POINT) {
478 /* Check if number of token fits within bounds */
479 if (wrqu->data.length > descr->max_tokens) {
480 netdev_err(dev, "(WE) : Wireless Event too big (%d)\n",
481 wrqu->data.length);
482 return;
483 }
484 if (wrqu->data.length < descr->min_tokens) {
485 netdev_err(dev, "(WE) : Wireless Event too small (%d)\n",
486 wrqu->data.length);
487 return;
488 }
489 /* Calculate extra_len - extra is NULL for restricted events */
490 if (extra != NULL)
491 extra_len = wrqu->data.length * descr->token_size;
492 /* Always at an offset in wrqu */
493 wrqu_off = IW_EV_POINT_OFF;
494 }
495
496 /* Total length of the event */
497 hdr_len = event_type_size[descr->header_type];
498 event_len = hdr_len + extra_len;
499
500 /*
501 * The problem for 64/32 bit.
502 *
503 * On 64-bit, a regular event is laid out as follows:
504 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
505 * | event.len | event.cmd | p a d d i n g |
506 * | wrqu data ... (with the correct size) |
507 *
508 * This padding exists because we manipulate event->u,
509 * and 'event' is not packed.
510 *
511 * An iw_point event is laid out like this instead:
512 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
513 * | event.len | event.cmd | p a d d i n g |
514 * | iwpnt.len | iwpnt.flg | p a d d i n g |
515 * | extra data ...
516 *
517 * The second padding exists because struct iw_point is extended,
518 * but this depends on the platform...
519 *
520 * On 32-bit, all the padding shouldn't be there.
521 */
522
523 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
524 if (!skb)
525 return;
526
527 /* Send via the RtNetlink event channel */
528 nlh = rtnetlink_ifinfo_prep(dev, skb);
529 if (WARN_ON(!nlh)) {
530 kfree_skb(skb);
531 return;
532 }
533
534 /* Add the wireless events in the netlink packet */
535 nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
536 if (!nla) {
537 kfree_skb(skb);
538 return;
539 }
540 event = nla_data(nla);
541
542 /* Fill event - first clear to avoid data leaking */
543 memset(event, 0, hdr_len);
544 event->len = event_len;
545 event->cmd = cmd;
546 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
547 if (extra_len)
548 memcpy(((char *) event) + hdr_len, extra, extra_len);
549
550 nlmsg_end(skb, nlh);
551 #ifdef CONFIG_COMPAT
552 hdr_len = compat_event_type_size[descr->header_type];
553 event_len = hdr_len + extra_len;
554
555 compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
556 if (!compskb) {
557 kfree_skb(skb);
558 return;
559 }
560
561 /* Send via the RtNetlink event channel */
562 nlh = rtnetlink_ifinfo_prep(dev, compskb);
563 if (WARN_ON(!nlh)) {
564 kfree_skb(skb);
565 kfree_skb(compskb);
566 return;
567 }
568
569 /* Add the wireless events in the netlink packet */
570 nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
571 if (!nla) {
572 kfree_skb(skb);
573 kfree_skb(compskb);
574 return;
575 }
576 compat_event = nla_data(nla);
577
578 compat_event->len = event_len;
579 compat_event->cmd = cmd;
580 if (descr->header_type == IW_HEADER_TYPE_POINT) {
581 compat_wrqu.length = wrqu->data.length;
582 compat_wrqu.flags = wrqu->data.flags;
583 memcpy(&compat_event->pointer,
584 ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
585 hdr_len - IW_EV_COMPAT_LCP_LEN);
586 if (extra_len)
587 memcpy(((char *) compat_event) + hdr_len,
588 extra, extra_len);
589 } else {
590 /* extra_len must be zero, so no if (extra) needed */
591 memcpy(&compat_event->pointer, wrqu,
592 hdr_len - IW_EV_COMPAT_LCP_LEN);
593 }
594
595 nlmsg_end(compskb, nlh);
596
597 skb_shinfo(skb)->frag_list = compskb;
598 #endif
599 skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
600 schedule_work(&wireless_nlevent_work);
601 }
602 EXPORT_SYMBOL(wireless_send_event);
603
604
605
606 /* IW handlers */
607
608 struct iw_statistics *get_wireless_stats(struct net_device *dev)
609 {
610 #ifdef CONFIG_WIRELESS_EXT
611 if ((dev->wireless_handlers != NULL) &&
612 (dev->wireless_handlers->get_wireless_stats != NULL))
613 return dev->wireless_handlers->get_wireless_stats(dev);
614 #endif
615
616 #ifdef CONFIG_CFG80211_WEXT
617 if (dev->ieee80211_ptr &&
618 dev->ieee80211_ptr->wiphy &&
619 dev->ieee80211_ptr->wiphy->wext &&
620 dev->ieee80211_ptr->wiphy->wext->get_wireless_stats)
621 return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
622 #endif
623
624 /* not found */
625 return NULL;
626 }
627
628 static int iw_handler_get_iwstats(struct net_device * dev,
629 struct iw_request_info * info,
630 union iwreq_data * wrqu,
631 char * extra)
632 {
633 /* Get stats from the driver */
634 struct iw_statistics *stats;
635
636 stats = get_wireless_stats(dev);
637 if (stats) {
638 /* Copy statistics to extra */
639 memcpy(extra, stats, sizeof(struct iw_statistics));
640 wrqu->data.length = sizeof(struct iw_statistics);
641
642 /* Check if we need to clear the updated flag */
643 if (wrqu->data.flags != 0)
644 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
645 return 0;
646 } else
647 return -EOPNOTSUPP;
648 }
649
650 static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
651 {
652 /* Don't "optimise" the following variable, it will crash */
653 unsigned int index; /* *MUST* be unsigned */
654 const struct iw_handler_def *handlers = NULL;
655
656 #ifdef CONFIG_CFG80211_WEXT
657 if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
658 handlers = dev->ieee80211_ptr->wiphy->wext;
659 #endif
660 #ifdef CONFIG_WIRELESS_EXT
661 if (dev->wireless_handlers)
662 handlers = dev->wireless_handlers;
663 #endif
664
665 if (!handlers)
666 return NULL;
667
668 /* Try as a standard command */
669 index = IW_IOCTL_IDX(cmd);
670 if (index < handlers->num_standard)
671 return handlers->standard[index];
672
673 #ifdef CONFIG_WEXT_PRIV
674 /* Try as a private command */
675 index = cmd - SIOCIWFIRSTPRIV;
676 if (index < handlers->num_private)
677 return handlers->private[index];
678 #endif
679
680 /* Not found */
681 return NULL;
682 }
683
684 static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
685 const struct iw_ioctl_description *descr,
686 iw_handler handler, struct net_device *dev,
687 struct iw_request_info *info)
688 {
689 int err, extra_size, user_length = 0, essid_compat = 0;
690 char *extra;
691
692 /* Calculate space needed by arguments. Always allocate
693 * for max space.
694 */
695 extra_size = descr->max_tokens * descr->token_size;
696
697 /* Check need for ESSID compatibility for WE < 21 */
698 switch (cmd) {
699 case SIOCSIWESSID:
700 case SIOCGIWESSID:
701 case SIOCSIWNICKN:
702 case SIOCGIWNICKN:
703 if (iwp->length == descr->max_tokens + 1)
704 essid_compat = 1;
705 else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
706 char essid[IW_ESSID_MAX_SIZE + 1];
707 unsigned int len;
708 len = iwp->length * descr->token_size;
709
710 if (len > IW_ESSID_MAX_SIZE)
711 return -EFAULT;
712
713 err = copy_from_user(essid, iwp->pointer, len);
714 if (err)
715 return -EFAULT;
716
717 if (essid[iwp->length - 1] == '\0')
718 essid_compat = 1;
719 }
720 break;
721 default:
722 break;
723 }
724
725 iwp->length -= essid_compat;
726
727 /* Check what user space is giving us */
728 if (IW_IS_SET(cmd)) {
729 /* Check NULL pointer */
730 if (!iwp->pointer && iwp->length != 0)
731 return -EFAULT;
732 /* Check if number of token fits within bounds */
733 if (iwp->length > descr->max_tokens)
734 return -E2BIG;
735 if (iwp->length < descr->min_tokens)
736 return -EINVAL;
737 } else {
738 /* Check NULL pointer */
739 if (!iwp->pointer)
740 return -EFAULT;
741 /* Save user space buffer size for checking */
742 user_length = iwp->length;
743
744 /* Don't check if user_length > max to allow forward
745 * compatibility. The test user_length < min is
746 * implied by the test at the end.
747 */
748
749 /* Support for very large requests */
750 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
751 (user_length > descr->max_tokens)) {
752 /* Allow userspace to GET more than max so
753 * we can support any size GET requests.
754 * There is still a limit : -ENOMEM.
755 */
756 extra_size = user_length * descr->token_size;
757
758 /* Note : user_length is originally a __u16,
759 * and token_size is controlled by us,
760 * so extra_size won't get negative and
761 * won't overflow...
762 */
763 }
764 }
765
766 /* kzalloc() ensures NULL-termination for essid_compat. */
767 extra = kzalloc(extra_size, GFP_KERNEL);
768 if (!extra)
769 return -ENOMEM;
770
771 /* If it is a SET, get all the extra data in here */
772 if (IW_IS_SET(cmd) && (iwp->length != 0)) {
773 if (copy_from_user(extra, iwp->pointer,
774 iwp->length *
775 descr->token_size)) {
776 err = -EFAULT;
777 goto out;
778 }
779
780 if (cmd == SIOCSIWENCODEEXT) {
781 struct iw_encode_ext *ee = (void *) extra;
782
783 if (iwp->length < sizeof(*ee) + ee->key_len)
784 return -EFAULT;
785 }
786 }
787
788 if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
789 /*
790 * If this is a GET, but not NOMAX, it means that the extra
791 * data is not bounded by userspace, but by max_tokens. Thus
792 * set the length to max_tokens. This matches the extra data
793 * allocation.
794 * The driver should fill it with the number of tokens it
795 * provided, and it may check iwp->length rather than having
796 * knowledge of max_tokens. If the driver doesn't change the
797 * iwp->length, this ioctl just copies back max_token tokens
798 * filled with zeroes. Hopefully the driver isn't claiming
799 * them to be valid data.
800 */
801 iwp->length = descr->max_tokens;
802 }
803
804 err = handler(dev, info, (union iwreq_data *) iwp, extra);
805
806 iwp->length += essid_compat;
807
808 /* If we have something to return to the user */
809 if (!err && IW_IS_GET(cmd)) {
810 /* Check if there is enough buffer up there */
811 if (user_length < iwp->length) {
812 err = -E2BIG;
813 goto out;
814 }
815
816 if (copy_to_user(iwp->pointer, extra,
817 iwp->length *
818 descr->token_size)) {
819 err = -EFAULT;
820 goto out;
821 }
822 }
823
824 /* Generate an event to notify listeners of the change */
825 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
826 ((err == 0) || (err == -EIWCOMMIT))) {
827 union iwreq_data *data = (union iwreq_data *) iwp;
828
829 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
830 /* If the event is restricted, don't
831 * export the payload.
832 */
833 wireless_send_event(dev, cmd, data, NULL);
834 else
835 wireless_send_event(dev, cmd, data, extra);
836 }
837
838 out:
839 kfree(extra);
840 return err;
841 }
842
843 /*
844 * Call the commit handler in the driver
845 * (if exist and if conditions are right)
846 *
847 * Note : our current commit strategy is currently pretty dumb,
848 * but we will be able to improve on that...
849 * The goal is to try to agreagate as many changes as possible
850 * before doing the commit. Drivers that will define a commit handler
851 * are usually those that need a reset after changing parameters, so
852 * we want to minimise the number of reset.
853 * A cool idea is to use a timer : at each "set" command, we re-set the
854 * timer, when the timer eventually fires, we call the driver.
855 * Hopefully, more on that later.
856 *
857 * Also, I'm waiting to see how many people will complain about the
858 * netif_running(dev) test. I'm open on that one...
859 * Hopefully, the driver will remember to do a commit in "open()" ;-)
860 */
861 int call_commit_handler(struct net_device *dev)
862 {
863 #ifdef CONFIG_WIRELESS_EXT
864 if ((netif_running(dev)) &&
865 (dev->wireless_handlers->standard[0] != NULL))
866 /* Call the commit handler on the driver */
867 return dev->wireless_handlers->standard[0](dev, NULL,
868 NULL, NULL);
869 else
870 return 0; /* Command completed successfully */
871 #else
872 /* cfg80211 has no commit */
873 return 0;
874 #endif
875 }
876
877 /*
878 * Main IOCTl dispatcher.
879 * Check the type of IOCTL and call the appropriate wrapper...
880 */
881 static int wireless_process_ioctl(struct net *net, struct ifreq *ifr,
882 unsigned int cmd,
883 struct iw_request_info *info,
884 wext_ioctl_func standard,
885 wext_ioctl_func private)
886 {
887 struct iwreq *iwr = (struct iwreq *) ifr;
888 struct net_device *dev;
889 iw_handler handler;
890
891 /* Permissions are already checked in dev_ioctl() before calling us.
892 * The copy_to/from_user() of ifr is also dealt with in there */
893
894 /* Make sure the device exist */
895 if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL)
896 return -ENODEV;
897
898 /* A bunch of special cases, then the generic case...
899 * Note that 'cmd' is already filtered in dev_ioctl() with
900 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
901 if (cmd == SIOCGIWSTATS)
902 return standard(dev, iwr, cmd, info,
903 &iw_handler_get_iwstats);
904
905 #ifdef CONFIG_WEXT_PRIV
906 if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
907 return standard(dev, iwr, cmd, info,
908 iw_handler_get_private);
909 #endif
910
911 /* Basic check */
912 if (!netif_device_present(dev))
913 return -ENODEV;
914
915 /* New driver API : try to find the handler */
916 handler = get_handler(dev, cmd);
917 if (handler) {
918 /* Standard and private are not the same */
919 if (cmd < SIOCIWFIRSTPRIV)
920 return standard(dev, iwr, cmd, info, handler);
921 else if (private)
922 return private(dev, iwr, cmd, info, handler);
923 }
924 /* Old driver API : call driver ioctl handler */
925 if (dev->netdev_ops->ndo_do_ioctl)
926 return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd);
927 return -EOPNOTSUPP;
928 }
929
930 /* If command is `set a parameter', or `get the encoding parameters',
931 * check if the user has the right to do it.
932 */
933 static int wext_permission_check(unsigned int cmd)
934 {
935 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
936 cmd == SIOCGIWENCODEEXT) &&
937 !capable(CAP_NET_ADMIN))
938 return -EPERM;
939
940 return 0;
941 }
942
943 /* entry point from dev ioctl */
944 static int wext_ioctl_dispatch(struct net *net, struct ifreq *ifr,
945 unsigned int cmd, struct iw_request_info *info,
946 wext_ioctl_func standard,
947 wext_ioctl_func private)
948 {
949 int ret = wext_permission_check(cmd);
950
951 if (ret)
952 return ret;
953
954 dev_load(net, ifr->ifr_name);
955 rtnl_lock();
956 ret = wireless_process_ioctl(net, ifr, cmd, info, standard, private);
957 rtnl_unlock();
958
959 return ret;
960 }
961
962 /*
963 * Wrapper to call a standard Wireless Extension handler.
964 * We do various checks and also take care of moving data between
965 * user space and kernel space.
966 */
967 static int ioctl_standard_call(struct net_device * dev,
968 struct iwreq *iwr,
969 unsigned int cmd,
970 struct iw_request_info *info,
971 iw_handler handler)
972 {
973 const struct iw_ioctl_description * descr;
974 int ret = -EINVAL;
975
976 /* Get the description of the IOCTL */
977 if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
978 return -EOPNOTSUPP;
979 descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
980
981 /* Check if we have a pointer to user space data or not */
982 if (descr->header_type != IW_HEADER_TYPE_POINT) {
983
984 /* No extra arguments. Trivial to handle */
985 ret = handler(dev, info, &(iwr->u), NULL);
986
987 /* Generate an event to notify listeners of the change */
988 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
989 ((ret == 0) || (ret == -EIWCOMMIT)))
990 wireless_send_event(dev, cmd, &(iwr->u), NULL);
991 } else {
992 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
993 handler, dev, info);
994 }
995
996 /* Call commit handler if needed and defined */
997 if (ret == -EIWCOMMIT)
998 ret = call_commit_handler(dev);
999
1000 /* Here, we will generate the appropriate event if needed */
1001
1002 return ret;
1003 }
1004
1005
1006 int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
1007 void __user *arg)
1008 {
1009 struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1010 int ret;
1011
1012 ret = wext_ioctl_dispatch(net, ifr, cmd, &info,
1013 ioctl_standard_call,
1014 ioctl_private_call);
1015 if (ret >= 0 &&
1016 IW_IS_GET(cmd) &&
1017 copy_to_user(arg, ifr, sizeof(struct iwreq)))
1018 return -EFAULT;
1019
1020 return ret;
1021 }
1022
1023 #ifdef CONFIG_COMPAT
1024 static int compat_standard_call(struct net_device *dev,
1025 struct iwreq *iwr,
1026 unsigned int cmd,
1027 struct iw_request_info *info,
1028 iw_handler handler)
1029 {
1030 const struct iw_ioctl_description *descr;
1031 struct compat_iw_point *iwp_compat;
1032 struct iw_point iwp;
1033 int err;
1034
1035 descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1036
1037 if (descr->header_type != IW_HEADER_TYPE_POINT)
1038 return ioctl_standard_call(dev, iwr, cmd, info, handler);
1039
1040 iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1041 iwp.pointer = compat_ptr(iwp_compat->pointer);
1042 iwp.length = iwp_compat->length;
1043 iwp.flags = iwp_compat->flags;
1044
1045 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1046
1047 iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1048 iwp_compat->length = iwp.length;
1049 iwp_compat->flags = iwp.flags;
1050
1051 return err;
1052 }
1053
1054 int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1055 unsigned long arg)
1056 {
1057 void __user *argp = (void __user *)arg;
1058 struct iw_request_info info;
1059 struct iwreq iwr;
1060 char *colon;
1061 int ret;
1062
1063 if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1064 return -EFAULT;
1065
1066 iwr.ifr_name[IFNAMSIZ-1] = 0;
1067 colon = strchr(iwr.ifr_name, ':');
1068 if (colon)
1069 *colon = 0;
1070
1071 info.cmd = cmd;
1072 info.flags = IW_REQUEST_FLAG_COMPAT;
1073
1074 ret = wext_ioctl_dispatch(net, (struct ifreq *) &iwr, cmd, &info,
1075 compat_standard_call,
1076 compat_private_call);
1077
1078 if (ret >= 0 &&
1079 IW_IS_GET(cmd) &&
1080 copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1081 return -EFAULT;
1082
1083 return ret;
1084 }
1085 #endif