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wireless: wext: avoid gcc -O3 warning
[mirror_ubuntu-bionic-kernel.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 err = register_netdevice_notifier(&wext_netdev_notifier);
403 if (err)
404 unregister_pernet_subsys(&wext_pernet_ops);
405 return err;
406 }
407
408 subsys_initcall(wireless_nlevent_init);
409
410 /* Process events generated by the wireless layer or the driver. */
411 static void wireless_nlevent_process(struct work_struct *work)
412 {
413 rtnl_lock();
414 wireless_nlevent_flush();
415 rtnl_unlock();
416 }
417
418 static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
419
420 static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
421 struct sk_buff *skb)
422 {
423 struct ifinfomsg *r;
424 struct nlmsghdr *nlh;
425
426 nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
427 if (!nlh)
428 return NULL;
429
430 r = nlmsg_data(nlh);
431 r->ifi_family = AF_UNSPEC;
432 r->__ifi_pad = 0;
433 r->ifi_type = dev->type;
434 r->ifi_index = dev->ifindex;
435 r->ifi_flags = dev_get_flags(dev);
436 r->ifi_change = 0; /* Wireless changes don't affect those flags */
437
438 if (nla_put_string(skb, IFLA_IFNAME, dev->name))
439 goto nla_put_failure;
440
441 return nlh;
442 nla_put_failure:
443 nlmsg_cancel(skb, nlh);
444 return NULL;
445 }
446
447
448 /*
449 * Main event dispatcher. Called from other parts and drivers.
450 * Send the event on the appropriate channels.
451 * May be called from interrupt context.
452 */
453 void wireless_send_event(struct net_device * dev,
454 unsigned int cmd,
455 union iwreq_data * wrqu,
456 const char * extra)
457 {
458 const struct iw_ioctl_description * descr = NULL;
459 int extra_len = 0;
460 struct iw_event *event; /* Mallocated whole event */
461 int event_len; /* Its size */
462 int hdr_len; /* Size of the event header */
463 int wrqu_off = 0; /* Offset in wrqu */
464 /* Don't "optimise" the following variable, it will crash */
465 unsigned int cmd_index; /* *MUST* be unsigned */
466 struct sk_buff *skb;
467 struct nlmsghdr *nlh;
468 struct nlattr *nla;
469 #ifdef CONFIG_COMPAT
470 struct __compat_iw_event *compat_event;
471 struct compat_iw_point compat_wrqu;
472 struct sk_buff *compskb;
473 #endif
474
475 /*
476 * Nothing in the kernel sends scan events with data, be safe.
477 * This is necessary because we cannot fix up scan event data
478 * for compat, due to being contained in 'extra', but normally
479 * applications are required to retrieve the scan data anyway
480 * and no data is included in the event, this codifies that
481 * practice.
482 */
483 if (WARN_ON(cmd == SIOCGIWSCAN && extra))
484 extra = NULL;
485
486 /* Get the description of the Event */
487 if (cmd <= SIOCIWLAST) {
488 cmd_index = IW_IOCTL_IDX(cmd);
489 if (cmd_index < standard_ioctl_num)
490 descr = &(standard_ioctl[cmd_index]);
491 } else {
492 cmd_index = IW_EVENT_IDX(cmd);
493 if (cmd_index < standard_event_num)
494 descr = &(standard_event[cmd_index]);
495 }
496 /* Don't accept unknown events */
497 if (descr == NULL) {
498 /* Note : we don't return an error to the driver, because
499 * the driver would not know what to do about it. It can't
500 * return an error to the user, because the event is not
501 * initiated by a user request.
502 * The best the driver could do is to log an error message.
503 * We will do it ourselves instead...
504 */
505 netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
506 cmd);
507 return;
508 }
509
510 /* Check extra parameters and set extra_len */
511 if (descr->header_type == IW_HEADER_TYPE_POINT) {
512 /* Check if number of token fits within bounds */
513 if (wrqu->data.length > descr->max_tokens) {
514 netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too big (%d)\n",
515 cmd, wrqu->data.length);
516 return;
517 }
518 if (wrqu->data.length < descr->min_tokens) {
519 netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too small (%d)\n",
520 cmd, wrqu->data.length);
521 return;
522 }
523 /* Calculate extra_len - extra is NULL for restricted events */
524 if (extra != NULL)
525 extra_len = wrqu->data.length * descr->token_size;
526 /* Always at an offset in wrqu */
527 wrqu_off = IW_EV_POINT_OFF;
528 }
529
530 /* Total length of the event */
531 hdr_len = event_type_size[descr->header_type];
532 event_len = hdr_len + extra_len;
533
534 /*
535 * The problem for 64/32 bit.
536 *
537 * On 64-bit, a regular event is laid out as follows:
538 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
539 * | event.len | event.cmd | p a d d i n g |
540 * | wrqu data ... (with the correct size) |
541 *
542 * This padding exists because we manipulate event->u,
543 * and 'event' is not packed.
544 *
545 * An iw_point event is laid out like this instead:
546 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
547 * | event.len | event.cmd | p a d d i n g |
548 * | iwpnt.len | iwpnt.flg | p a d d i n g |
549 * | extra data ...
550 *
551 * The second padding exists because struct iw_point is extended,
552 * but this depends on the platform...
553 *
554 * On 32-bit, all the padding shouldn't be there.
555 */
556
557 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
558 if (!skb)
559 return;
560
561 /* Send via the RtNetlink event channel */
562 nlh = rtnetlink_ifinfo_prep(dev, skb);
563 if (WARN_ON(!nlh)) {
564 kfree_skb(skb);
565 return;
566 }
567
568 /* Add the wireless events in the netlink packet */
569 nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
570 if (!nla) {
571 kfree_skb(skb);
572 return;
573 }
574 event = nla_data(nla);
575
576 /* Fill event - first clear to avoid data leaking */
577 memset(event, 0, hdr_len);
578 event->len = event_len;
579 event->cmd = cmd;
580 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
581 if (extra_len)
582 memcpy(((char *) event) + hdr_len, extra, extra_len);
583
584 nlmsg_end(skb, nlh);
585 #ifdef CONFIG_COMPAT
586 hdr_len = compat_event_type_size[descr->header_type];
587 event_len = hdr_len + extra_len;
588
589 compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
590 if (!compskb) {
591 kfree_skb(skb);
592 return;
593 }
594
595 /* Send via the RtNetlink event channel */
596 nlh = rtnetlink_ifinfo_prep(dev, compskb);
597 if (WARN_ON(!nlh)) {
598 kfree_skb(skb);
599 kfree_skb(compskb);
600 return;
601 }
602
603 /* Add the wireless events in the netlink packet */
604 nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
605 if (!nla) {
606 kfree_skb(skb);
607 kfree_skb(compskb);
608 return;
609 }
610 compat_event = nla_data(nla);
611
612 compat_event->len = event_len;
613 compat_event->cmd = cmd;
614 if (descr->header_type == IW_HEADER_TYPE_POINT) {
615 compat_wrqu.length = wrqu->data.length;
616 compat_wrqu.flags = wrqu->data.flags;
617 memcpy(&compat_event->pointer,
618 ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
619 hdr_len - IW_EV_COMPAT_LCP_LEN);
620 if (extra_len)
621 memcpy(((char *) compat_event) + hdr_len,
622 extra, extra_len);
623 } else {
624 /* extra_len must be zero, so no if (extra) needed */
625 memcpy(&compat_event->pointer, wrqu,
626 hdr_len - IW_EV_COMPAT_LCP_LEN);
627 }
628
629 nlmsg_end(compskb, nlh);
630
631 skb_shinfo(skb)->frag_list = compskb;
632 #endif
633 skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
634 schedule_work(&wireless_nlevent_work);
635 }
636 EXPORT_SYMBOL(wireless_send_event);
637
638
639
640 /* IW handlers */
641
642 struct iw_statistics *get_wireless_stats(struct net_device *dev)
643 {
644 #ifdef CONFIG_WIRELESS_EXT
645 if ((dev->wireless_handlers != NULL) &&
646 (dev->wireless_handlers->get_wireless_stats != NULL))
647 return dev->wireless_handlers->get_wireless_stats(dev);
648 #endif
649
650 #ifdef CONFIG_CFG80211_WEXT
651 if (dev->ieee80211_ptr &&
652 dev->ieee80211_ptr->wiphy &&
653 dev->ieee80211_ptr->wiphy->wext &&
654 dev->ieee80211_ptr->wiphy->wext->get_wireless_stats)
655 return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
656 #endif
657
658 /* not found */
659 return NULL;
660 }
661
662 /* noinline to avoid a bogus warning with -O3 */
663 static noinline int iw_handler_get_iwstats(struct net_device * dev,
664 struct iw_request_info * info,
665 union iwreq_data * wrqu,
666 char * extra)
667 {
668 /* Get stats from the driver */
669 struct iw_statistics *stats;
670
671 stats = get_wireless_stats(dev);
672 if (stats) {
673 /* Copy statistics to extra */
674 memcpy(extra, stats, sizeof(struct iw_statistics));
675 wrqu->data.length = sizeof(struct iw_statistics);
676
677 /* Check if we need to clear the updated flag */
678 if (wrqu->data.flags != 0)
679 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
680 return 0;
681 } else
682 return -EOPNOTSUPP;
683 }
684
685 static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
686 {
687 /* Don't "optimise" the following variable, it will crash */
688 unsigned int index; /* *MUST* be unsigned */
689 const struct iw_handler_def *handlers = NULL;
690
691 #ifdef CONFIG_CFG80211_WEXT
692 if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
693 handlers = dev->ieee80211_ptr->wiphy->wext;
694 #endif
695 #ifdef CONFIG_WIRELESS_EXT
696 if (dev->wireless_handlers)
697 handlers = dev->wireless_handlers;
698 #endif
699
700 if (!handlers)
701 return NULL;
702
703 /* Try as a standard command */
704 index = IW_IOCTL_IDX(cmd);
705 if (index < handlers->num_standard)
706 return handlers->standard[index];
707
708 #ifdef CONFIG_WEXT_PRIV
709 /* Try as a private command */
710 index = cmd - SIOCIWFIRSTPRIV;
711 if (index < handlers->num_private)
712 return handlers->private[index];
713 #endif
714
715 /* Not found */
716 return NULL;
717 }
718
719 static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
720 const struct iw_ioctl_description *descr,
721 iw_handler handler, struct net_device *dev,
722 struct iw_request_info *info)
723 {
724 int err, extra_size, user_length = 0, essid_compat = 0;
725 char *extra;
726
727 /* Calculate space needed by arguments. Always allocate
728 * for max space.
729 */
730 extra_size = descr->max_tokens * descr->token_size;
731
732 /* Check need for ESSID compatibility for WE < 21 */
733 switch (cmd) {
734 case SIOCSIWESSID:
735 case SIOCGIWESSID:
736 case SIOCSIWNICKN:
737 case SIOCGIWNICKN:
738 if (iwp->length == descr->max_tokens + 1)
739 essid_compat = 1;
740 else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
741 char essid[IW_ESSID_MAX_SIZE + 1];
742 unsigned int len;
743 len = iwp->length * descr->token_size;
744
745 if (len > IW_ESSID_MAX_SIZE)
746 return -EFAULT;
747
748 err = copy_from_user(essid, iwp->pointer, len);
749 if (err)
750 return -EFAULT;
751
752 if (essid[iwp->length - 1] == '\0')
753 essid_compat = 1;
754 }
755 break;
756 default:
757 break;
758 }
759
760 iwp->length -= essid_compat;
761
762 /* Check what user space is giving us */
763 if (IW_IS_SET(cmd)) {
764 /* Check NULL pointer */
765 if (!iwp->pointer && iwp->length != 0)
766 return -EFAULT;
767 /* Check if number of token fits within bounds */
768 if (iwp->length > descr->max_tokens)
769 return -E2BIG;
770 if (iwp->length < descr->min_tokens)
771 return -EINVAL;
772 } else {
773 /* Check NULL pointer */
774 if (!iwp->pointer)
775 return -EFAULT;
776 /* Save user space buffer size for checking */
777 user_length = iwp->length;
778
779 /* Don't check if user_length > max to allow forward
780 * compatibility. The test user_length < min is
781 * implied by the test at the end.
782 */
783
784 /* Support for very large requests */
785 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
786 (user_length > descr->max_tokens)) {
787 /* Allow userspace to GET more than max so
788 * we can support any size GET requests.
789 * There is still a limit : -ENOMEM.
790 */
791 extra_size = user_length * descr->token_size;
792
793 /* Note : user_length is originally a __u16,
794 * and token_size is controlled by us,
795 * so extra_size won't get negative and
796 * won't overflow...
797 */
798 }
799 }
800
801 /* kzalloc() ensures NULL-termination for essid_compat. */
802 extra = kzalloc(extra_size, GFP_KERNEL);
803 if (!extra)
804 return -ENOMEM;
805
806 /* If it is a SET, get all the extra data in here */
807 if (IW_IS_SET(cmd) && (iwp->length != 0)) {
808 if (copy_from_user(extra, iwp->pointer,
809 iwp->length *
810 descr->token_size)) {
811 err = -EFAULT;
812 goto out;
813 }
814
815 if (cmd == SIOCSIWENCODEEXT) {
816 struct iw_encode_ext *ee = (void *) extra;
817
818 if (iwp->length < sizeof(*ee) + ee->key_len) {
819 err = -EFAULT;
820 goto out;
821 }
822 }
823 }
824
825 if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
826 /*
827 * If this is a GET, but not NOMAX, it means that the extra
828 * data is not bounded by userspace, but by max_tokens. Thus
829 * set the length to max_tokens. This matches the extra data
830 * allocation.
831 * The driver should fill it with the number of tokens it
832 * provided, and it may check iwp->length rather than having
833 * knowledge of max_tokens. If the driver doesn't change the
834 * iwp->length, this ioctl just copies back max_token tokens
835 * filled with zeroes. Hopefully the driver isn't claiming
836 * them to be valid data.
837 */
838 iwp->length = descr->max_tokens;
839 }
840
841 err = handler(dev, info, (union iwreq_data *) iwp, extra);
842
843 iwp->length += essid_compat;
844
845 /* If we have something to return to the user */
846 if (!err && IW_IS_GET(cmd)) {
847 /* Check if there is enough buffer up there */
848 if (user_length < iwp->length) {
849 err = -E2BIG;
850 goto out;
851 }
852
853 if (copy_to_user(iwp->pointer, extra,
854 iwp->length *
855 descr->token_size)) {
856 err = -EFAULT;
857 goto out;
858 }
859 }
860
861 /* Generate an event to notify listeners of the change */
862 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
863 ((err == 0) || (err == -EIWCOMMIT))) {
864 union iwreq_data *data = (union iwreq_data *) iwp;
865
866 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
867 /* If the event is restricted, don't
868 * export the payload.
869 */
870 wireless_send_event(dev, cmd, data, NULL);
871 else
872 wireless_send_event(dev, cmd, data, extra);
873 }
874
875 out:
876 kfree(extra);
877 return err;
878 }
879
880 /*
881 * Call the commit handler in the driver
882 * (if exist and if conditions are right)
883 *
884 * Note : our current commit strategy is currently pretty dumb,
885 * but we will be able to improve on that...
886 * The goal is to try to agreagate as many changes as possible
887 * before doing the commit. Drivers that will define a commit handler
888 * are usually those that need a reset after changing parameters, so
889 * we want to minimise the number of reset.
890 * A cool idea is to use a timer : at each "set" command, we re-set the
891 * timer, when the timer eventually fires, we call the driver.
892 * Hopefully, more on that later.
893 *
894 * Also, I'm waiting to see how many people will complain about the
895 * netif_running(dev) test. I'm open on that one...
896 * Hopefully, the driver will remember to do a commit in "open()" ;-)
897 */
898 int call_commit_handler(struct net_device *dev)
899 {
900 #ifdef CONFIG_WIRELESS_EXT
901 if ((netif_running(dev)) &&
902 (dev->wireless_handlers->standard[0] != NULL))
903 /* Call the commit handler on the driver */
904 return dev->wireless_handlers->standard[0](dev, NULL,
905 NULL, NULL);
906 else
907 return 0; /* Command completed successfully */
908 #else
909 /* cfg80211 has no commit */
910 return 0;
911 #endif
912 }
913
914 /*
915 * Main IOCTl dispatcher.
916 * Check the type of IOCTL and call the appropriate wrapper...
917 */
918 static int wireless_process_ioctl(struct net *net, struct iwreq *iwr,
919 unsigned int cmd,
920 struct iw_request_info *info,
921 wext_ioctl_func standard,
922 wext_ioctl_func private)
923 {
924 struct net_device *dev;
925 iw_handler handler;
926
927 /* Permissions are already checked in dev_ioctl() before calling us.
928 * The copy_to/from_user() of ifr is also dealt with in there */
929
930 /* Make sure the device exist */
931 if ((dev = __dev_get_by_name(net, iwr->ifr_name)) == NULL)
932 return -ENODEV;
933
934 /* A bunch of special cases, then the generic case...
935 * Note that 'cmd' is already filtered in dev_ioctl() with
936 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
937 if (cmd == SIOCGIWSTATS)
938 return standard(dev, iwr, cmd, info,
939 &iw_handler_get_iwstats);
940
941 #ifdef CONFIG_WEXT_PRIV
942 if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
943 return standard(dev, iwr, cmd, info,
944 iw_handler_get_private);
945 #endif
946
947 /* Basic check */
948 if (!netif_device_present(dev))
949 return -ENODEV;
950
951 /* New driver API : try to find the handler */
952 handler = get_handler(dev, cmd);
953 if (handler) {
954 /* Standard and private are not the same */
955 if (cmd < SIOCIWFIRSTPRIV)
956 return standard(dev, iwr, cmd, info, handler);
957 else if (private)
958 return private(dev, iwr, cmd, info, handler);
959 }
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 iwreq *iwr,
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, iwr->ifr_name);
988 rtnl_lock();
989 ret = wireless_process_ioctl(net, iwr, 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 iwreq *iwr, 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, iwr, cmd, &info,
1046 ioctl_standard_call,
1047 ioctl_private_call);
1048 if (ret >= 0 &&
1049 IW_IS_GET(cmd) &&
1050 copy_to_user(arg, iwr, 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, &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
1119
1120 char *iwe_stream_add_event(struct iw_request_info *info, char *stream,
1121 char *ends, struct iw_event *iwe, int event_len)
1122 {
1123 int lcp_len = iwe_stream_lcp_len(info);
1124
1125 event_len = iwe_stream_event_len_adjust(info, event_len);
1126
1127 /* Check if it's possible */
1128 if (likely((stream + event_len) < ends)) {
1129 iwe->len = event_len;
1130 /* Beware of alignement issues on 64 bits */
1131 memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1132 memcpy(stream + lcp_len, &iwe->u,
1133 event_len - lcp_len);
1134 stream += event_len;
1135 }
1136
1137 return stream;
1138 }
1139 EXPORT_SYMBOL(iwe_stream_add_event);
1140
1141 char *iwe_stream_add_point(struct iw_request_info *info, char *stream,
1142 char *ends, struct iw_event *iwe, char *extra)
1143 {
1144 int event_len = iwe_stream_point_len(info) + iwe->u.data.length;
1145 int point_len = iwe_stream_point_len(info);
1146 int lcp_len = iwe_stream_lcp_len(info);
1147
1148 /* Check if it's possible */
1149 if (likely((stream + event_len) < ends)) {
1150 iwe->len = event_len;
1151 memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1152 memcpy(stream + lcp_len,
1153 ((char *) &iwe->u) + IW_EV_POINT_OFF,
1154 IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN);
1155 if (iwe->u.data.length && extra)
1156 memcpy(stream + point_len, extra, iwe->u.data.length);
1157 stream += event_len;
1158 }
1159
1160 return stream;
1161 }
1162 EXPORT_SYMBOL(iwe_stream_add_point);
1163
1164 char *iwe_stream_add_value(struct iw_request_info *info, char *event,
1165 char *value, char *ends, struct iw_event *iwe,
1166 int event_len)
1167 {
1168 int lcp_len = iwe_stream_lcp_len(info);
1169
1170 /* Don't duplicate LCP */
1171 event_len -= IW_EV_LCP_LEN;
1172
1173 /* Check if it's possible */
1174 if (likely((value + event_len) < ends)) {
1175 /* Add new value */
1176 memcpy(value, &iwe->u, event_len);
1177 value += event_len;
1178 /* Patch LCP */
1179 iwe->len = value - event;
1180 memcpy(event, (char *) iwe, lcp_len);
1181 }
1182
1183 return value;
1184 }
1185 EXPORT_SYMBOL(iwe_stream_add_value);
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