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Merge branches 'acpi-soc', 'acpi-misc', 'acpi-pci' and 'device-properties'
[deliverable/linux.git] / net / wireless / wext-core.c
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 int 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 int 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 void wireless_nlevent_flush(void)
346 {
347 struct sk_buff *skb;
348 struct net *net;
349
350 ASSERT_RTNL();
351
352 for_each_net(net) {
353 while ((skb = skb_dequeue(&net->wext_nlevents)))
354 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL,
355 GFP_KERNEL);
356 }
357 }
358 EXPORT_SYMBOL_GPL(wireless_nlevent_flush);
359
360 static int wext_netdev_notifier_call(struct notifier_block *nb,
361 unsigned long state, void *ptr)
362 {
363 /*
364 * When a netdev changes state in any way, flush all pending messages
365 * to avoid them going out in a strange order, e.g. RTM_NEWLINK after
366 * RTM_DELLINK, or with IFF_UP after without IFF_UP during dev_close()
367 * or similar - all of which could otherwise happen due to delays from
368 * schedule_work().
369 */
370 wireless_nlevent_flush();
371
372 return NOTIFY_OK;
373 }
374
375 static struct notifier_block wext_netdev_notifier = {
376 .notifier_call = wext_netdev_notifier_call,
377 };
378
379 static int __net_init wext_pernet_init(struct net *net)
380 {
381 skb_queue_head_init(&net->wext_nlevents);
382 return 0;
383 }
384
385 static void __net_exit wext_pernet_exit(struct net *net)
386 {
387 skb_queue_purge(&net->wext_nlevents);
388 }
389
390 static struct pernet_operations wext_pernet_ops = {
391 .init = wext_pernet_init,
392 .exit = wext_pernet_exit,
393 };
394
395 static int __init wireless_nlevent_init(void)
396 {
397 int err = register_pernet_subsys(&wext_pernet_ops);
398
399 if (err)
400 return err;
401
402 return register_netdevice_notifier(&wext_netdev_notifier);
403 }
404
405 subsys_initcall(wireless_nlevent_init);
406
407 /* Process events generated by the wireless layer or the driver. */
408 static void wireless_nlevent_process(struct work_struct *work)
409 {
410 rtnl_lock();
411 wireless_nlevent_flush();
412 rtnl_unlock();
413 }
414
415 static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
416
417 static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
418 struct sk_buff *skb)
419 {
420 struct ifinfomsg *r;
421 struct nlmsghdr *nlh;
422
423 nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
424 if (!nlh)
425 return NULL;
426
427 r = nlmsg_data(nlh);
428 r->ifi_family = AF_UNSPEC;
429 r->__ifi_pad = 0;
430 r->ifi_type = dev->type;
431 r->ifi_index = dev->ifindex;
432 r->ifi_flags = dev_get_flags(dev);
433 r->ifi_change = 0; /* Wireless changes don't affect those flags */
434
435 if (nla_put_string(skb, IFLA_IFNAME, dev->name))
436 goto nla_put_failure;
437
438 return nlh;
439 nla_put_failure:
440 nlmsg_cancel(skb, nlh);
441 return NULL;
442 }
443
444
445 /*
446 * Main event dispatcher. Called from other parts and drivers.
447 * Send the event on the appropriate channels.
448 * May be called from interrupt context.
449 */
450 void wireless_send_event(struct net_device * dev,
451 unsigned int cmd,
452 union iwreq_data * wrqu,
453 const char * extra)
454 {
455 const struct iw_ioctl_description * descr = NULL;
456 int extra_len = 0;
457 struct iw_event *event; /* Mallocated whole event */
458 int event_len; /* Its size */
459 int hdr_len; /* Size of the event header */
460 int wrqu_off = 0; /* Offset in wrqu */
461 /* Don't "optimise" the following variable, it will crash */
462 unsigned int cmd_index; /* *MUST* be unsigned */
463 struct sk_buff *skb;
464 struct nlmsghdr *nlh;
465 struct nlattr *nla;
466 #ifdef CONFIG_COMPAT
467 struct __compat_iw_event *compat_event;
468 struct compat_iw_point compat_wrqu;
469 struct sk_buff *compskb;
470 #endif
471
472 /*
473 * Nothing in the kernel sends scan events with data, be safe.
474 * This is necessary because we cannot fix up scan event data
475 * for compat, due to being contained in 'extra', but normally
476 * applications are required to retrieve the scan data anyway
477 * and no data is included in the event, this codifies that
478 * practice.
479 */
480 if (WARN_ON(cmd == SIOCGIWSCAN && extra))
481 extra = NULL;
482
483 /* Get the description of the Event */
484 if (cmd <= SIOCIWLAST) {
485 cmd_index = IW_IOCTL_IDX(cmd);
486 if (cmd_index < standard_ioctl_num)
487 descr = &(standard_ioctl[cmd_index]);
488 } else {
489 cmd_index = IW_EVENT_IDX(cmd);
490 if (cmd_index < standard_event_num)
491 descr = &(standard_event[cmd_index]);
492 }
493 /* Don't accept unknown events */
494 if (descr == NULL) {
495 /* Note : we don't return an error to the driver, because
496 * the driver would not know what to do about it. It can't
497 * return an error to the user, because the event is not
498 * initiated by a user request.
499 * The best the driver could do is to log an error message.
500 * We will do it ourselves instead...
501 */
502 netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
503 cmd);
504 return;
505 }
506
507 /* Check extra parameters and set extra_len */
508 if (descr->header_type == IW_HEADER_TYPE_POINT) {
509 /* Check if number of token fits within bounds */
510 if (wrqu->data.length > descr->max_tokens) {
511 netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too big (%d)\n",
512 cmd, wrqu->data.length);
513 return;
514 }
515 if (wrqu->data.length < descr->min_tokens) {
516 netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too small (%d)\n",
517 cmd, wrqu->data.length);
518 return;
519 }
520 /* Calculate extra_len - extra is NULL for restricted events */
521 if (extra != NULL)
522 extra_len = wrqu->data.length * descr->token_size;
523 /* Always at an offset in wrqu */
524 wrqu_off = IW_EV_POINT_OFF;
525 }
526
527 /* Total length of the event */
528 hdr_len = event_type_size[descr->header_type];
529 event_len = hdr_len + extra_len;
530
531 /*
532 * The problem for 64/32 bit.
533 *
534 * On 64-bit, a regular event is laid out as follows:
535 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
536 * | event.len | event.cmd | p a d d i n g |
537 * | wrqu data ... (with the correct size) |
538 *
539 * This padding exists because we manipulate event->u,
540 * and 'event' is not packed.
541 *
542 * An iw_point event is laid out like this instead:
543 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
544 * | event.len | event.cmd | p a d d i n g |
545 * | iwpnt.len | iwpnt.flg | p a d d i n g |
546 * | extra data ...
547 *
548 * The second padding exists because struct iw_point is extended,
549 * but this depends on the platform...
550 *
551 * On 32-bit, all the padding shouldn't be there.
552 */
553
554 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
555 if (!skb)
556 return;
557
558 /* Send via the RtNetlink event channel */
559 nlh = rtnetlink_ifinfo_prep(dev, skb);
560 if (WARN_ON(!nlh)) {
561 kfree_skb(skb);
562 return;
563 }
564
565 /* Add the wireless events in the netlink packet */
566 nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
567 if (!nla) {
568 kfree_skb(skb);
569 return;
570 }
571 event = nla_data(nla);
572
573 /* Fill event - first clear to avoid data leaking */
574 memset(event, 0, hdr_len);
575 event->len = event_len;
576 event->cmd = cmd;
577 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
578 if (extra_len)
579 memcpy(((char *) event) + hdr_len, extra, extra_len);
580
581 nlmsg_end(skb, nlh);
582 #ifdef CONFIG_COMPAT
583 hdr_len = compat_event_type_size[descr->header_type];
584 event_len = hdr_len + extra_len;
585
586 compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
587 if (!compskb) {
588 kfree_skb(skb);
589 return;
590 }
591
592 /* Send via the RtNetlink event channel */
593 nlh = rtnetlink_ifinfo_prep(dev, compskb);
594 if (WARN_ON(!nlh)) {
595 kfree_skb(skb);
596 kfree_skb(compskb);
597 return;
598 }
599
600 /* Add the wireless events in the netlink packet */
601 nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
602 if (!nla) {
603 kfree_skb(skb);
604 kfree_skb(compskb);
605 return;
606 }
607 compat_event = nla_data(nla);
608
609 compat_event->len = event_len;
610 compat_event->cmd = cmd;
611 if (descr->header_type == IW_HEADER_TYPE_POINT) {
612 compat_wrqu.length = wrqu->data.length;
613 compat_wrqu.flags = wrqu->data.flags;
614 memcpy(&compat_event->pointer,
615 ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
616 hdr_len - IW_EV_COMPAT_LCP_LEN);
617 if (extra_len)
618 memcpy(((char *) compat_event) + hdr_len,
619 extra, extra_len);
620 } else {
621 /* extra_len must be zero, so no if (extra) needed */
622 memcpy(&compat_event->pointer, wrqu,
623 hdr_len - IW_EV_COMPAT_LCP_LEN);
624 }
625
626 nlmsg_end(compskb, nlh);
627
628 skb_shinfo(skb)->frag_list = compskb;
629 #endif
630 skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
631 schedule_work(&wireless_nlevent_work);
632 }
633 EXPORT_SYMBOL(wireless_send_event);
634
635
636
637 /* IW handlers */
638
639 struct iw_statistics *get_wireless_stats(struct net_device *dev)
640 {
641 #ifdef CONFIG_WIRELESS_EXT
642 if ((dev->wireless_handlers != NULL) &&
643 (dev->wireless_handlers->get_wireless_stats != NULL))
644 return dev->wireless_handlers->get_wireless_stats(dev);
645 #endif
646
647 #ifdef CONFIG_CFG80211_WEXT
648 if (dev->ieee80211_ptr &&
649 dev->ieee80211_ptr->wiphy &&
650 dev->ieee80211_ptr->wiphy->wext &&
651 dev->ieee80211_ptr->wiphy->wext->get_wireless_stats)
652 return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
653 #endif
654
655 /* not found */
656 return NULL;
657 }
658
659 static int iw_handler_get_iwstats(struct net_device * dev,
660 struct iw_request_info * info,
661 union iwreq_data * wrqu,
662 char * extra)
663 {
664 /* Get stats from the driver */
665 struct iw_statistics *stats;
666
667 stats = get_wireless_stats(dev);
668 if (stats) {
669 /* Copy statistics to extra */
670 memcpy(extra, stats, sizeof(struct iw_statistics));
671 wrqu->data.length = sizeof(struct iw_statistics);
672
673 /* Check if we need to clear the updated flag */
674 if (wrqu->data.flags != 0)
675 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
676 return 0;
677 } else
678 return -EOPNOTSUPP;
679 }
680
681 static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
682 {
683 /* Don't "optimise" the following variable, it will crash */
684 unsigned int index; /* *MUST* be unsigned */
685 const struct iw_handler_def *handlers = NULL;
686
687 #ifdef CONFIG_CFG80211_WEXT
688 if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
689 handlers = dev->ieee80211_ptr->wiphy->wext;
690 #endif
691 #ifdef CONFIG_WIRELESS_EXT
692 if (dev->wireless_handlers)
693 handlers = dev->wireless_handlers;
694 #endif
695
696 if (!handlers)
697 return NULL;
698
699 /* Try as a standard command */
700 index = IW_IOCTL_IDX(cmd);
701 if (index < handlers->num_standard)
702 return handlers->standard[index];
703
704 #ifdef CONFIG_WEXT_PRIV
705 /* Try as a private command */
706 index = cmd - SIOCIWFIRSTPRIV;
707 if (index < handlers->num_private)
708 return handlers->private[index];
709 #endif
710
711 /* Not found */
712 return NULL;
713 }
714
715 static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
716 const struct iw_ioctl_description *descr,
717 iw_handler handler, struct net_device *dev,
718 struct iw_request_info *info)
719 {
720 int err, extra_size, user_length = 0, essid_compat = 0;
721 char *extra;
722
723 /* Calculate space needed by arguments. Always allocate
724 * for max space.
725 */
726 extra_size = descr->max_tokens * descr->token_size;
727
728 /* Check need for ESSID compatibility for WE < 21 */
729 switch (cmd) {
730 case SIOCSIWESSID:
731 case SIOCGIWESSID:
732 case SIOCSIWNICKN:
733 case SIOCGIWNICKN:
734 if (iwp->length == descr->max_tokens + 1)
735 essid_compat = 1;
736 else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
737 char essid[IW_ESSID_MAX_SIZE + 1];
738 unsigned int len;
739 len = iwp->length * descr->token_size;
740
741 if (len > IW_ESSID_MAX_SIZE)
742 return -EFAULT;
743
744 err = copy_from_user(essid, iwp->pointer, len);
745 if (err)
746 return -EFAULT;
747
748 if (essid[iwp->length - 1] == '\0')
749 essid_compat = 1;
750 }
751 break;
752 default:
753 break;
754 }
755
756 iwp->length -= essid_compat;
757
758 /* Check what user space is giving us */
759 if (IW_IS_SET(cmd)) {
760 /* Check NULL pointer */
761 if (!iwp->pointer && iwp->length != 0)
762 return -EFAULT;
763 /* Check if number of token fits within bounds */
764 if (iwp->length > descr->max_tokens)
765 return -E2BIG;
766 if (iwp->length < descr->min_tokens)
767 return -EINVAL;
768 } else {
769 /* Check NULL pointer */
770 if (!iwp->pointer)
771 return -EFAULT;
772 /* Save user space buffer size for checking */
773 user_length = iwp->length;
774
775 /* Don't check if user_length > max to allow forward
776 * compatibility. The test user_length < min is
777 * implied by the test at the end.
778 */
779
780 /* Support for very large requests */
781 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
782 (user_length > descr->max_tokens)) {
783 /* Allow userspace to GET more than max so
784 * we can support any size GET requests.
785 * There is still a limit : -ENOMEM.
786 */
787 extra_size = user_length * descr->token_size;
788
789 /* Note : user_length is originally a __u16,
790 * and token_size is controlled by us,
791 * so extra_size won't get negative and
792 * won't overflow...
793 */
794 }
795 }
796
797 /* kzalloc() ensures NULL-termination for essid_compat. */
798 extra = kzalloc(extra_size, GFP_KERNEL);
799 if (!extra)
800 return -ENOMEM;
801
802 /* If it is a SET, get all the extra data in here */
803 if (IW_IS_SET(cmd) && (iwp->length != 0)) {
804 if (copy_from_user(extra, iwp->pointer,
805 iwp->length *
806 descr->token_size)) {
807 err = -EFAULT;
808 goto out;
809 }
810
811 if (cmd == SIOCSIWENCODEEXT) {
812 struct iw_encode_ext *ee = (void *) extra;
813
814 if (iwp->length < sizeof(*ee) + ee->key_len) {
815 err = -EFAULT;
816 goto out;
817 }
818 }
819 }
820
821 if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
822 /*
823 * If this is a GET, but not NOMAX, it means that the extra
824 * data is not bounded by userspace, but by max_tokens. Thus
825 * set the length to max_tokens. This matches the extra data
826 * allocation.
827 * The driver should fill it with the number of tokens it
828 * provided, and it may check iwp->length rather than having
829 * knowledge of max_tokens. If the driver doesn't change the
830 * iwp->length, this ioctl just copies back max_token tokens
831 * filled with zeroes. Hopefully the driver isn't claiming
832 * them to be valid data.
833 */
834 iwp->length = descr->max_tokens;
835 }
836
837 err = handler(dev, info, (union iwreq_data *) iwp, extra);
838
839 iwp->length += essid_compat;
840
841 /* If we have something to return to the user */
842 if (!err && IW_IS_GET(cmd)) {
843 /* Check if there is enough buffer up there */
844 if (user_length < iwp->length) {
845 err = -E2BIG;
846 goto out;
847 }
848
849 if (copy_to_user(iwp->pointer, extra,
850 iwp->length *
851 descr->token_size)) {
852 err = -EFAULT;
853 goto out;
854 }
855 }
856
857 /* Generate an event to notify listeners of the change */
858 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
859 ((err == 0) || (err == -EIWCOMMIT))) {
860 union iwreq_data *data = (union iwreq_data *) iwp;
861
862 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
863 /* If the event is restricted, don't
864 * export the payload.
865 */
866 wireless_send_event(dev, cmd, data, NULL);
867 else
868 wireless_send_event(dev, cmd, data, extra);
869 }
870
871 out:
872 kfree(extra);
873 return err;
874 }
875
876 /*
877 * Call the commit handler in the driver
878 * (if exist and if conditions are right)
879 *
880 * Note : our current commit strategy is currently pretty dumb,
881 * but we will be able to improve on that...
882 * The goal is to try to agreagate as many changes as possible
883 * before doing the commit. Drivers that will define a commit handler
884 * are usually those that need a reset after changing parameters, so
885 * we want to minimise the number of reset.
886 * A cool idea is to use a timer : at each "set" command, we re-set the
887 * timer, when the timer eventually fires, we call the driver.
888 * Hopefully, more on that later.
889 *
890 * Also, I'm waiting to see how many people will complain about the
891 * netif_running(dev) test. I'm open on that one...
892 * Hopefully, the driver will remember to do a commit in "open()" ;-)
893 */
894 int call_commit_handler(struct net_device *dev)
895 {
896 #ifdef CONFIG_WIRELESS_EXT
897 if ((netif_running(dev)) &&
898 (dev->wireless_handlers->standard[0] != NULL))
899 /* Call the commit handler on the driver */
900 return dev->wireless_handlers->standard[0](dev, NULL,
901 NULL, NULL);
902 else
903 return 0; /* Command completed successfully */
904 #else
905 /* cfg80211 has no commit */
906 return 0;
907 #endif
908 }
909
910 /*
911 * Main IOCTl dispatcher.
912 * Check the type of IOCTL and call the appropriate wrapper...
913 */
914 static int wireless_process_ioctl(struct net *net, struct ifreq *ifr,
915 unsigned int cmd,
916 struct iw_request_info *info,
917 wext_ioctl_func standard,
918 wext_ioctl_func private)
919 {
920 struct iwreq *iwr = (struct iwreq *) ifr;
921 struct net_device *dev;
922 iw_handler handler;
923
924 /* Permissions are already checked in dev_ioctl() before calling us.
925 * The copy_to/from_user() of ifr is also dealt with in there */
926
927 /* Make sure the device exist */
928 if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL)
929 return -ENODEV;
930
931 /* A bunch of special cases, then the generic case...
932 * Note that 'cmd' is already filtered in dev_ioctl() with
933 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
934 if (cmd == SIOCGIWSTATS)
935 return standard(dev, iwr, cmd, info,
936 &iw_handler_get_iwstats);
937
938 #ifdef CONFIG_WEXT_PRIV
939 if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
940 return standard(dev, iwr, cmd, info,
941 iw_handler_get_private);
942 #endif
943
944 /* Basic check */
945 if (!netif_device_present(dev))
946 return -ENODEV;
947
948 /* New driver API : try to find the handler */
949 handler = get_handler(dev, cmd);
950 if (handler) {
951 /* Standard and private are not the same */
952 if (cmd < SIOCIWFIRSTPRIV)
953 return standard(dev, iwr, cmd, info, handler);
954 else if (private)
955 return private(dev, iwr, cmd, info, handler);
956 }
957 /* Old driver API : call driver ioctl handler */
958 if (dev->netdev_ops->ndo_do_ioctl)
959 return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd);
960 return -EOPNOTSUPP;
961 }
962
963 /* If command is `set a parameter', or `get the encoding parameters',
964 * check if the user has the right to do it.
965 */
966 static int wext_permission_check(unsigned int cmd)
967 {
968 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
969 cmd == SIOCGIWENCODEEXT) &&
970 !capable(CAP_NET_ADMIN))
971 return -EPERM;
972
973 return 0;
974 }
975
976 /* entry point from dev ioctl */
977 static int wext_ioctl_dispatch(struct net *net, struct ifreq *ifr,
978 unsigned int cmd, struct iw_request_info *info,
979 wext_ioctl_func standard,
980 wext_ioctl_func private)
981 {
982 int ret = wext_permission_check(cmd);
983
984 if (ret)
985 return ret;
986
987 dev_load(net, ifr->ifr_name);
988 rtnl_lock();
989 ret = wireless_process_ioctl(net, ifr, cmd, info, standard, private);
990 rtnl_unlock();
991
992 return ret;
993 }
994
995 /*
996 * Wrapper to call a standard Wireless Extension handler.
997 * We do various checks and also take care of moving data between
998 * user space and kernel space.
999 */
1000 static int ioctl_standard_call(struct net_device * dev,
1001 struct iwreq *iwr,
1002 unsigned int cmd,
1003 struct iw_request_info *info,
1004 iw_handler handler)
1005 {
1006 const struct iw_ioctl_description * descr;
1007 int ret = -EINVAL;
1008
1009 /* Get the description of the IOCTL */
1010 if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
1011 return -EOPNOTSUPP;
1012 descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
1013
1014 /* Check if we have a pointer to user space data or not */
1015 if (descr->header_type != IW_HEADER_TYPE_POINT) {
1016
1017 /* No extra arguments. Trivial to handle */
1018 ret = handler(dev, info, &(iwr->u), NULL);
1019
1020 /* Generate an event to notify listeners of the change */
1021 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
1022 ((ret == 0) || (ret == -EIWCOMMIT)))
1023 wireless_send_event(dev, cmd, &(iwr->u), NULL);
1024 } else {
1025 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
1026 handler, dev, info);
1027 }
1028
1029 /* Call commit handler if needed and defined */
1030 if (ret == -EIWCOMMIT)
1031 ret = call_commit_handler(dev);
1032
1033 /* Here, we will generate the appropriate event if needed */
1034
1035 return ret;
1036 }
1037
1038
1039 int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
1040 void __user *arg)
1041 {
1042 struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1043 int ret;
1044
1045 ret = wext_ioctl_dispatch(net, ifr, cmd, &info,
1046 ioctl_standard_call,
1047 ioctl_private_call);
1048 if (ret >= 0 &&
1049 IW_IS_GET(cmd) &&
1050 copy_to_user(arg, ifr, sizeof(struct iwreq)))
1051 return -EFAULT;
1052
1053 return ret;
1054 }
1055
1056 #ifdef CONFIG_COMPAT
1057 static int compat_standard_call(struct net_device *dev,
1058 struct iwreq *iwr,
1059 unsigned int cmd,
1060 struct iw_request_info *info,
1061 iw_handler handler)
1062 {
1063 const struct iw_ioctl_description *descr;
1064 struct compat_iw_point *iwp_compat;
1065 struct iw_point iwp;
1066 int err;
1067
1068 descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1069
1070 if (descr->header_type != IW_HEADER_TYPE_POINT)
1071 return ioctl_standard_call(dev, iwr, cmd, info, handler);
1072
1073 iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1074 iwp.pointer = compat_ptr(iwp_compat->pointer);
1075 iwp.length = iwp_compat->length;
1076 iwp.flags = iwp_compat->flags;
1077
1078 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1079
1080 iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1081 iwp_compat->length = iwp.length;
1082 iwp_compat->flags = iwp.flags;
1083
1084 return err;
1085 }
1086
1087 int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1088 unsigned long arg)
1089 {
1090 void __user *argp = (void __user *)arg;
1091 struct iw_request_info info;
1092 struct iwreq iwr;
1093 char *colon;
1094 int ret;
1095
1096 if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1097 return -EFAULT;
1098
1099 iwr.ifr_name[IFNAMSIZ-1] = 0;
1100 colon = strchr(iwr.ifr_name, ':');
1101 if (colon)
1102 *colon = 0;
1103
1104 info.cmd = cmd;
1105 info.flags = IW_REQUEST_FLAG_COMPAT;
1106
1107 ret = wext_ioctl_dispatch(net, (struct ifreq *) &iwr, cmd, &info,
1108 compat_standard_call,
1109 compat_private_call);
1110
1111 if (ret >= 0 &&
1112 IW_IS_GET(cmd) &&
1113 copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1114 return -EFAULT;
1115
1116 return ret;
1117 }
1118 #endif
Linux kernel - Deliverables
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