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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
23typedef 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 */
32static 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};
259static 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 */
265static 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};
309static const unsigned int standard_event_num = ARRAY_SIZE(standard_event);
310
311/* Size (in bytes) of various events */
312static 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
327static 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
345void 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}
358EXPORT_SYMBOL_GPL(wireless_nlevent_flush);
359
360static 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
375static struct notifier_block wext_netdev_notifier = {
376 .notifier_call = wext_netdev_notifier_call,
377};
378
379static int __net_init wext_pernet_init(struct net *net)
380{
381 skb_queue_head_init(&net->wext_nlevents);
382 return 0;
383}
384
385static void __net_exit wext_pernet_exit(struct net *net)
386{
387 skb_queue_purge(&net->wext_nlevents);
388}
389
390static struct pernet_operations wext_pernet_ops = {
391 .init = wext_pernet_init,
392 .exit = wext_pernet_exit,
393};
394
395static 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
408subsys_initcall(wireless_nlevent_init);
409
410/* Process events generated by the wireless layer or the driver. */
411static void wireless_nlevent_process(struct work_struct *work)
412{
413 rtnl_lock();
414 wireless_nlevent_flush();
415 rtnl_unlock();
416}
417
418static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
419
420static 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 */
453void 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}
636EXPORT_SYMBOL(wireless_send_event);
637
638
639
640/* IW handlers */
641
642struct 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
662static int iw_handler_get_iwstats(struct net_device * dev,
663 struct iw_request_info * info,
664 union iwreq_data * wrqu,
665 char * extra)
666{
667 /* Get stats from the driver */
668 struct iw_statistics *stats;
669
670 stats = get_wireless_stats(dev);
671 if (stats) {
672 /* Copy statistics to extra */
673 memcpy(extra, stats, sizeof(struct iw_statistics));
674 wrqu->data.length = sizeof(struct iw_statistics);
675
676 /* Check if we need to clear the updated flag */
677 if (wrqu->data.flags != 0)
678 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
679 return 0;
680 } else
681 return -EOPNOTSUPP;
682}
683
684static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
685{
686 /* Don't "optimise" the following variable, it will crash */
687 unsigned int index; /* *MUST* be unsigned */
688 const struct iw_handler_def *handlers = NULL;
689
690#ifdef CONFIG_CFG80211_WEXT
691 if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
692 handlers = dev->ieee80211_ptr->wiphy->wext;
693#endif
694#ifdef CONFIG_WIRELESS_EXT
695 if (dev->wireless_handlers)
696 handlers = dev->wireless_handlers;
697#endif
698
699 if (!handlers)
700 return NULL;
701
702 /* Try as a standard command */
703 index = IW_IOCTL_IDX(cmd);
704 if (index < handlers->num_standard)
705 return handlers->standard[index];
706
707#ifdef CONFIG_WEXT_PRIV
708 /* Try as a private command */
709 index = cmd - SIOCIWFIRSTPRIV;
710 if (index < handlers->num_private)
711 return handlers->private[index];
712#endif
713
714 /* Not found */
715 return NULL;
716}
717
718static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
719 const struct iw_ioctl_description *descr,
720 iw_handler handler, struct net_device *dev,
721 struct iw_request_info *info)
722{
723 int err, extra_size, user_length = 0, essid_compat = 0;
724 char *extra;
725
726 /* Calculate space needed by arguments. Always allocate
727 * for max space.
728 */
729 extra_size = descr->max_tokens * descr->token_size;
730
731 /* Check need for ESSID compatibility for WE < 21 */
732 switch (cmd) {
733 case SIOCSIWESSID:
734 case SIOCGIWESSID:
735 case SIOCSIWNICKN:
736 case SIOCGIWNICKN:
737 if (iwp->length == descr->max_tokens + 1)
738 essid_compat = 1;
739 else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
740 char essid[IW_ESSID_MAX_SIZE + 1];
741 unsigned int len;
742 len = iwp->length * descr->token_size;
743
744 if (len > IW_ESSID_MAX_SIZE)
745 return -EFAULT;
746
747 err = copy_from_user(essid, iwp->pointer, len);
748 if (err)
749 return -EFAULT;
750
751 if (essid[iwp->length - 1] == '\0')
752 essid_compat = 1;
753 }
754 break;
755 default:
756 break;
757 }
758
759 iwp->length -= essid_compat;
760
761 /* Check what user space is giving us */
762 if (IW_IS_SET(cmd)) {
763 /* Check NULL pointer */
764 if (!iwp->pointer && iwp->length != 0)
765 return -EFAULT;
766 /* Check if number of token fits within bounds */
767 if (iwp->length > descr->max_tokens)
768 return -E2BIG;
769 if (iwp->length < descr->min_tokens)
770 return -EINVAL;
771 } else {
772 /* Check NULL pointer */
773 if (!iwp->pointer)
774 return -EFAULT;
775 /* Save user space buffer size for checking */
776 user_length = iwp->length;
777
778 /* Don't check if user_length > max to allow forward
779 * compatibility. The test user_length < min is
780 * implied by the test at the end.
781 */
782
783 /* Support for very large requests */
784 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
785 (user_length > descr->max_tokens)) {
786 /* Allow userspace to GET more than max so
787 * we can support any size GET requests.
788 * There is still a limit : -ENOMEM.
789 */
790 extra_size = user_length * descr->token_size;
791
792 /* Note : user_length is originally a __u16,
793 * and token_size is controlled by us,
794 * so extra_size won't get negative and
795 * won't overflow...
796 */
797 }
798 }
799
800 /* kzalloc() ensures NULL-termination for essid_compat. */
801 extra = kzalloc(extra_size, GFP_KERNEL);
802 if (!extra)
803 return -ENOMEM;
804
805 /* If it is a SET, get all the extra data in here */
806 if (IW_IS_SET(cmd) && (iwp->length != 0)) {
807 if (copy_from_user(extra, iwp->pointer,
808 iwp->length *
809 descr->token_size)) {
810 err = -EFAULT;
811 goto out;
812 }
813
814 if (cmd == SIOCSIWENCODEEXT) {
815 struct iw_encode_ext *ee = (void *) extra;
816
817 if (iwp->length < sizeof(*ee) + ee->key_len) {
818 err = -EFAULT;
819 goto out;
820 }
821 }
822 }
823
824 if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
825 /*
826 * If this is a GET, but not NOMAX, it means that the extra
827 * data is not bounded by userspace, but by max_tokens. Thus
828 * set the length to max_tokens. This matches the extra data
829 * allocation.
830 * The driver should fill it with the number of tokens it
831 * provided, and it may check iwp->length rather than having
832 * knowledge of max_tokens. If the driver doesn't change the
833 * iwp->length, this ioctl just copies back max_token tokens
834 * filled with zeroes. Hopefully the driver isn't claiming
835 * them to be valid data.
836 */
837 iwp->length = descr->max_tokens;
838 }
839
840 err = handler(dev, info, (union iwreq_data *) iwp, extra);
841
842 iwp->length += essid_compat;
843
844 /* If we have something to return to the user */
845 if (!err && IW_IS_GET(cmd)) {
846 /* Check if there is enough buffer up there */
847 if (user_length < iwp->length) {
848 err = -E2BIG;
849 goto out;
850 }
851
852 if (copy_to_user(iwp->pointer, extra,
853 iwp->length *
854 descr->token_size)) {
855 err = -EFAULT;
856 goto out;
857 }
858 }
859
860 /* Generate an event to notify listeners of the change */
861 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
862 ((err == 0) || (err == -EIWCOMMIT))) {
863 union iwreq_data *data = (union iwreq_data *) iwp;
864
865 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
866 /* If the event is restricted, don't
867 * export the payload.
868 */
869 wireless_send_event(dev, cmd, data, NULL);
870 else
871 wireless_send_event(dev, cmd, data, extra);
872 }
873
874out:
875 kfree(extra);
876 return err;
877}
878
879/*
880 * Call the commit handler in the driver
881 * (if exist and if conditions are right)
882 *
883 * Note : our current commit strategy is currently pretty dumb,
884 * but we will be able to improve on that...
885 * The goal is to try to agreagate as many changes as possible
886 * before doing the commit. Drivers that will define a commit handler
887 * are usually those that need a reset after changing parameters, so
888 * we want to minimise the number of reset.
889 * A cool idea is to use a timer : at each "set" command, we re-set the
890 * timer, when the timer eventually fires, we call the driver.
891 * Hopefully, more on that later.
892 *
893 * Also, I'm waiting to see how many people will complain about the
894 * netif_running(dev) test. I'm open on that one...
895 * Hopefully, the driver will remember to do a commit in "open()" ;-)
896 */
897int call_commit_handler(struct net_device *dev)
898{
899#ifdef CONFIG_WIRELESS_EXT
900 if ((netif_running(dev)) &&
901 (dev->wireless_handlers->standard[0] != NULL))
902 /* Call the commit handler on the driver */
903 return dev->wireless_handlers->standard[0](dev, NULL,
904 NULL, NULL);
905 else
906 return 0; /* Command completed successfully */
907#else
908 /* cfg80211 has no commit */
909 return 0;
910#endif
911}
912
913/*
914 * Main IOCTl dispatcher.
915 * Check the type of IOCTL and call the appropriate wrapper...
916 */
917static int wireless_process_ioctl(struct net *net, struct ifreq *ifr,
918 unsigned int cmd,
919 struct iw_request_info *info,
920 wext_ioctl_func standard,
921 wext_ioctl_func private)
922{
923 struct iwreq *iwr = (struct iwreq *) ifr;
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, ifr->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 /* Old driver API : call driver ioctl handler */
961 if (dev->netdev_ops->ndo_do_ioctl)
962 return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd);
963 return -EOPNOTSUPP;
964}
965
966/* If command is `set a parameter', or `get the encoding parameters',
967 * check if the user has the right to do it.
968 */
969static int wext_permission_check(unsigned int cmd)
970{
971 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
972 cmd == SIOCGIWENCODEEXT) &&
973 !capable(CAP_NET_ADMIN))
974 return -EPERM;
975
976 return 0;
977}
978
979/* entry point from dev ioctl */
980static int wext_ioctl_dispatch(struct net *net, struct ifreq *ifr,
981 unsigned int cmd, struct iw_request_info *info,
982 wext_ioctl_func standard,
983 wext_ioctl_func private)
984{
985 int ret = wext_permission_check(cmd);
986
987 if (ret)
988 return ret;
989
990 dev_load(net, ifr->ifr_name);
991 rtnl_lock();
992 ret = wireless_process_ioctl(net, ifr, cmd, info, standard, private);
993 rtnl_unlock();
994
995 return ret;
996}
997
998/*
999 * Wrapper to call a standard Wireless Extension handler.
1000 * We do various checks and also take care of moving data between
1001 * user space and kernel space.
1002 */
1003static int ioctl_standard_call(struct net_device * dev,
1004 struct iwreq *iwr,
1005 unsigned int cmd,
1006 struct iw_request_info *info,
1007 iw_handler handler)
1008{
1009 const struct iw_ioctl_description * descr;
1010 int ret = -EINVAL;
1011
1012 /* Get the description of the IOCTL */
1013 if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
1014 return -EOPNOTSUPP;
1015 descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
1016
1017 /* Check if we have a pointer to user space data or not */
1018 if (descr->header_type != IW_HEADER_TYPE_POINT) {
1019
1020 /* No extra arguments. Trivial to handle */
1021 ret = handler(dev, info, &(iwr->u), NULL);
1022
1023 /* Generate an event to notify listeners of the change */
1024 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
1025 ((ret == 0) || (ret == -EIWCOMMIT)))
1026 wireless_send_event(dev, cmd, &(iwr->u), NULL);
1027 } else {
1028 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
1029 handler, dev, info);
1030 }
1031
1032 /* Call commit handler if needed and defined */
1033 if (ret == -EIWCOMMIT)
1034 ret = call_commit_handler(dev);
1035
1036 /* Here, we will generate the appropriate event if needed */
1037
1038 return ret;
1039}
1040
1041
1042int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
1043 void __user *arg)
1044{
1045 struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1046 int ret;
1047
1048 ret = wext_ioctl_dispatch(net, ifr, cmd, &info,
1049 ioctl_standard_call,
1050 ioctl_private_call);
1051 if (ret >= 0 &&
1052 IW_IS_GET(cmd) &&
1053 copy_to_user(arg, ifr, sizeof(struct iwreq)))
1054 return -EFAULT;
1055
1056 return ret;
1057}
1058
1059#ifdef CONFIG_COMPAT
1060static int compat_standard_call(struct net_device *dev,
1061 struct iwreq *iwr,
1062 unsigned int cmd,
1063 struct iw_request_info *info,
1064 iw_handler handler)
1065{
1066 const struct iw_ioctl_description *descr;
1067 struct compat_iw_point *iwp_compat;
1068 struct iw_point iwp;
1069 int err;
1070
1071 descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1072
1073 if (descr->header_type != IW_HEADER_TYPE_POINT)
1074 return ioctl_standard_call(dev, iwr, cmd, info, handler);
1075
1076 iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1077 iwp.pointer = compat_ptr(iwp_compat->pointer);
1078 iwp.length = iwp_compat->length;
1079 iwp.flags = iwp_compat->flags;
1080
1081 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1082
1083 iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1084 iwp_compat->length = iwp.length;
1085 iwp_compat->flags = iwp.flags;
1086
1087 return err;
1088}
1089
1090int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1091 unsigned long arg)
1092{
1093 void __user *argp = (void __user *)arg;
1094 struct iw_request_info info;
1095 struct iwreq iwr;
1096 char *colon;
1097 int ret;
1098
1099 if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1100 return -EFAULT;
1101
1102 iwr.ifr_name[IFNAMSIZ-1] = 0;
1103 colon = strchr(iwr.ifr_name, ':');
1104 if (colon)
1105 *colon = 0;
1106
1107 info.cmd = cmd;
1108 info.flags = IW_REQUEST_FLAG_COMPAT;
1109
1110 ret = wext_ioctl_dispatch(net, (struct ifreq *) &iwr, cmd, &info,
1111 compat_standard_call,
1112 compat_private_call);
1113
1114 if (ret >= 0 &&
1115 IW_IS_GET(cmd) &&
1116 copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1117 return -EFAULT;
1118
1119 return ret;
1120}
1121#endif
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 * Copyright (C) 2024 Intel Corporation
8 *
9 * (As all part of the Linux kernel, this file is GPL)
10 */
11#include <linux/kernel.h>
12#include <linux/netdevice.h>
13#include <linux/rtnetlink.h>
14#include <linux/slab.h>
15#include <linux/wireless.h>
16#include <linux/uaccess.h>
17#include <linux/export.h>
18#include <net/cfg80211.h>
19#include <net/iw_handler.h>
20#include <net/netlink.h>
21#include <net/wext.h>
22#include <net/net_namespace.h>
23
24typedef int (*wext_ioctl_func)(struct net_device *, struct iwreq *,
25 unsigned int, struct iw_request_info *,
26 iw_handler);
27
28
29/*
30 * Meta-data about all the standard Wireless Extension request we
31 * know about.
32 */
33static const struct iw_ioctl_description standard_ioctl[] = {
34 [IW_IOCTL_IDX(SIOCSIWCOMMIT)] = {
35 .header_type = IW_HEADER_TYPE_NULL,
36 },
37 [IW_IOCTL_IDX(SIOCGIWNAME)] = {
38 .header_type = IW_HEADER_TYPE_CHAR,
39 .flags = IW_DESCR_FLAG_DUMP,
40 },
41 [IW_IOCTL_IDX(SIOCSIWNWID)] = {
42 .header_type = IW_HEADER_TYPE_PARAM,
43 .flags = IW_DESCR_FLAG_EVENT,
44 },
45 [IW_IOCTL_IDX(SIOCGIWNWID)] = {
46 .header_type = IW_HEADER_TYPE_PARAM,
47 .flags = IW_DESCR_FLAG_DUMP,
48 },
49 [IW_IOCTL_IDX(SIOCSIWFREQ)] = {
50 .header_type = IW_HEADER_TYPE_FREQ,
51 .flags = IW_DESCR_FLAG_EVENT,
52 },
53 [IW_IOCTL_IDX(SIOCGIWFREQ)] = {
54 .header_type = IW_HEADER_TYPE_FREQ,
55 .flags = IW_DESCR_FLAG_DUMP,
56 },
57 [IW_IOCTL_IDX(SIOCSIWMODE)] = {
58 .header_type = IW_HEADER_TYPE_UINT,
59 .flags = IW_DESCR_FLAG_EVENT,
60 },
61 [IW_IOCTL_IDX(SIOCGIWMODE)] = {
62 .header_type = IW_HEADER_TYPE_UINT,
63 .flags = IW_DESCR_FLAG_DUMP,
64 },
65 [IW_IOCTL_IDX(SIOCSIWSENS)] = {
66 .header_type = IW_HEADER_TYPE_PARAM,
67 },
68 [IW_IOCTL_IDX(SIOCGIWSENS)] = {
69 .header_type = IW_HEADER_TYPE_PARAM,
70 },
71 [IW_IOCTL_IDX(SIOCSIWRANGE)] = {
72 .header_type = IW_HEADER_TYPE_NULL,
73 },
74 [IW_IOCTL_IDX(SIOCGIWRANGE)] = {
75 .header_type = IW_HEADER_TYPE_POINT,
76 .token_size = 1,
77 .max_tokens = sizeof(struct iw_range),
78 .flags = IW_DESCR_FLAG_DUMP,
79 },
80 [IW_IOCTL_IDX(SIOCSIWPRIV)] = {
81 .header_type = IW_HEADER_TYPE_NULL,
82 },
83 [IW_IOCTL_IDX(SIOCGIWPRIV)] = { /* (handled directly by us) */
84 .header_type = IW_HEADER_TYPE_POINT,
85 .token_size = sizeof(struct iw_priv_args),
86 .max_tokens = 16,
87 .flags = IW_DESCR_FLAG_NOMAX,
88 },
89 [IW_IOCTL_IDX(SIOCSIWSTATS)] = {
90 .header_type = IW_HEADER_TYPE_NULL,
91 },
92 [IW_IOCTL_IDX(SIOCGIWSTATS)] = { /* (handled directly by us) */
93 .header_type = IW_HEADER_TYPE_POINT,
94 .token_size = 1,
95 .max_tokens = sizeof(struct iw_statistics),
96 .flags = IW_DESCR_FLAG_DUMP,
97 },
98 [IW_IOCTL_IDX(SIOCSIWSPY)] = {
99 .header_type = IW_HEADER_TYPE_POINT,
100 .token_size = sizeof(struct sockaddr),
101 .max_tokens = IW_MAX_SPY,
102 },
103 [IW_IOCTL_IDX(SIOCGIWSPY)] = {
104 .header_type = IW_HEADER_TYPE_POINT,
105 .token_size = sizeof(struct sockaddr) +
106 sizeof(struct iw_quality),
107 .max_tokens = IW_MAX_SPY,
108 },
109 [IW_IOCTL_IDX(SIOCSIWTHRSPY)] = {
110 .header_type = IW_HEADER_TYPE_POINT,
111 .token_size = sizeof(struct iw_thrspy),
112 .min_tokens = 1,
113 .max_tokens = 1,
114 },
115 [IW_IOCTL_IDX(SIOCGIWTHRSPY)] = {
116 .header_type = IW_HEADER_TYPE_POINT,
117 .token_size = sizeof(struct iw_thrspy),
118 .min_tokens = 1,
119 .max_tokens = 1,
120 },
121 [IW_IOCTL_IDX(SIOCSIWAP)] = {
122 .header_type = IW_HEADER_TYPE_ADDR,
123 },
124 [IW_IOCTL_IDX(SIOCGIWAP)] = {
125 .header_type = IW_HEADER_TYPE_ADDR,
126 .flags = IW_DESCR_FLAG_DUMP,
127 },
128 [IW_IOCTL_IDX(SIOCSIWMLME)] = {
129 .header_type = IW_HEADER_TYPE_POINT,
130 .token_size = 1,
131 .min_tokens = sizeof(struct iw_mlme),
132 .max_tokens = sizeof(struct iw_mlme),
133 },
134 [IW_IOCTL_IDX(SIOCGIWAPLIST)] = {
135 .header_type = IW_HEADER_TYPE_POINT,
136 .token_size = sizeof(struct sockaddr) +
137 sizeof(struct iw_quality),
138 .max_tokens = IW_MAX_AP,
139 .flags = IW_DESCR_FLAG_NOMAX,
140 },
141 [IW_IOCTL_IDX(SIOCSIWSCAN)] = {
142 .header_type = IW_HEADER_TYPE_POINT,
143 .token_size = 1,
144 .min_tokens = 0,
145 .max_tokens = sizeof(struct iw_scan_req),
146 },
147 [IW_IOCTL_IDX(SIOCGIWSCAN)] = {
148 .header_type = IW_HEADER_TYPE_POINT,
149 .token_size = 1,
150 .max_tokens = IW_SCAN_MAX_DATA,
151 .flags = IW_DESCR_FLAG_NOMAX,
152 },
153 [IW_IOCTL_IDX(SIOCSIWESSID)] = {
154 .header_type = IW_HEADER_TYPE_POINT,
155 .token_size = 1,
156 .max_tokens = IW_ESSID_MAX_SIZE,
157 .flags = IW_DESCR_FLAG_EVENT,
158 },
159 [IW_IOCTL_IDX(SIOCGIWESSID)] = {
160 .header_type = IW_HEADER_TYPE_POINT,
161 .token_size = 1,
162 .max_tokens = IW_ESSID_MAX_SIZE,
163 .flags = IW_DESCR_FLAG_DUMP,
164 },
165 [IW_IOCTL_IDX(SIOCSIWNICKN)] = {
166 .header_type = IW_HEADER_TYPE_POINT,
167 .token_size = 1,
168 .max_tokens = IW_ESSID_MAX_SIZE,
169 },
170 [IW_IOCTL_IDX(SIOCGIWNICKN)] = {
171 .header_type = IW_HEADER_TYPE_POINT,
172 .token_size = 1,
173 .max_tokens = IW_ESSID_MAX_SIZE,
174 },
175 [IW_IOCTL_IDX(SIOCSIWRATE)] = {
176 .header_type = IW_HEADER_TYPE_PARAM,
177 },
178 [IW_IOCTL_IDX(SIOCGIWRATE)] = {
179 .header_type = IW_HEADER_TYPE_PARAM,
180 },
181 [IW_IOCTL_IDX(SIOCSIWRTS)] = {
182 .header_type = IW_HEADER_TYPE_PARAM,
183 },
184 [IW_IOCTL_IDX(SIOCGIWRTS)] = {
185 .header_type = IW_HEADER_TYPE_PARAM,
186 },
187 [IW_IOCTL_IDX(SIOCSIWFRAG)] = {
188 .header_type = IW_HEADER_TYPE_PARAM,
189 },
190 [IW_IOCTL_IDX(SIOCGIWFRAG)] = {
191 .header_type = IW_HEADER_TYPE_PARAM,
192 },
193 [IW_IOCTL_IDX(SIOCSIWTXPOW)] = {
194 .header_type = IW_HEADER_TYPE_PARAM,
195 },
196 [IW_IOCTL_IDX(SIOCGIWTXPOW)] = {
197 .header_type = IW_HEADER_TYPE_PARAM,
198 },
199 [IW_IOCTL_IDX(SIOCSIWRETRY)] = {
200 .header_type = IW_HEADER_TYPE_PARAM,
201 },
202 [IW_IOCTL_IDX(SIOCGIWRETRY)] = {
203 .header_type = IW_HEADER_TYPE_PARAM,
204 },
205 [IW_IOCTL_IDX(SIOCSIWENCODE)] = {
206 .header_type = IW_HEADER_TYPE_POINT,
207 .token_size = 1,
208 .max_tokens = IW_ENCODING_TOKEN_MAX,
209 .flags = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
210 },
211 [IW_IOCTL_IDX(SIOCGIWENCODE)] = {
212 .header_type = IW_HEADER_TYPE_POINT,
213 .token_size = 1,
214 .max_tokens = IW_ENCODING_TOKEN_MAX,
215 .flags = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
216 },
217 [IW_IOCTL_IDX(SIOCSIWPOWER)] = {
218 .header_type = IW_HEADER_TYPE_PARAM,
219 },
220 [IW_IOCTL_IDX(SIOCGIWPOWER)] = {
221 .header_type = IW_HEADER_TYPE_PARAM,
222 },
223 [IW_IOCTL_IDX(SIOCSIWGENIE)] = {
224 .header_type = IW_HEADER_TYPE_POINT,
225 .token_size = 1,
226 .max_tokens = IW_GENERIC_IE_MAX,
227 },
228 [IW_IOCTL_IDX(SIOCGIWGENIE)] = {
229 .header_type = IW_HEADER_TYPE_POINT,
230 .token_size = 1,
231 .max_tokens = IW_GENERIC_IE_MAX,
232 },
233 [IW_IOCTL_IDX(SIOCSIWAUTH)] = {
234 .header_type = IW_HEADER_TYPE_PARAM,
235 },
236 [IW_IOCTL_IDX(SIOCGIWAUTH)] = {
237 .header_type = IW_HEADER_TYPE_PARAM,
238 },
239 [IW_IOCTL_IDX(SIOCSIWENCODEEXT)] = {
240 .header_type = IW_HEADER_TYPE_POINT,
241 .token_size = 1,
242 .min_tokens = sizeof(struct iw_encode_ext),
243 .max_tokens = sizeof(struct iw_encode_ext) +
244 IW_ENCODING_TOKEN_MAX,
245 },
246 [IW_IOCTL_IDX(SIOCGIWENCODEEXT)] = {
247 .header_type = IW_HEADER_TYPE_POINT,
248 .token_size = 1,
249 .min_tokens = sizeof(struct iw_encode_ext),
250 .max_tokens = sizeof(struct iw_encode_ext) +
251 IW_ENCODING_TOKEN_MAX,
252 },
253 [IW_IOCTL_IDX(SIOCSIWPMKSA)] = {
254 .header_type = IW_HEADER_TYPE_POINT,
255 .token_size = 1,
256 .min_tokens = sizeof(struct iw_pmksa),
257 .max_tokens = sizeof(struct iw_pmksa),
258 },
259};
260static const unsigned int standard_ioctl_num = ARRAY_SIZE(standard_ioctl);
261
262/*
263 * Meta-data about all the additional standard Wireless Extension events
264 * we know about.
265 */
266static const struct iw_ioctl_description standard_event[] = {
267 [IW_EVENT_IDX(IWEVTXDROP)] = {
268 .header_type = IW_HEADER_TYPE_ADDR,
269 },
270 [IW_EVENT_IDX(IWEVQUAL)] = {
271 .header_type = IW_HEADER_TYPE_QUAL,
272 },
273 [IW_EVENT_IDX(IWEVCUSTOM)] = {
274 .header_type = IW_HEADER_TYPE_POINT,
275 .token_size = 1,
276 .max_tokens = IW_CUSTOM_MAX,
277 },
278 [IW_EVENT_IDX(IWEVREGISTERED)] = {
279 .header_type = IW_HEADER_TYPE_ADDR,
280 },
281 [IW_EVENT_IDX(IWEVEXPIRED)] = {
282 .header_type = IW_HEADER_TYPE_ADDR,
283 },
284 [IW_EVENT_IDX(IWEVGENIE)] = {
285 .header_type = IW_HEADER_TYPE_POINT,
286 .token_size = 1,
287 .max_tokens = IW_GENERIC_IE_MAX,
288 },
289 [IW_EVENT_IDX(IWEVMICHAELMICFAILURE)] = {
290 .header_type = IW_HEADER_TYPE_POINT,
291 .token_size = 1,
292 .max_tokens = sizeof(struct iw_michaelmicfailure),
293 },
294 [IW_EVENT_IDX(IWEVASSOCREQIE)] = {
295 .header_type = IW_HEADER_TYPE_POINT,
296 .token_size = 1,
297 .max_tokens = IW_GENERIC_IE_MAX,
298 },
299 [IW_EVENT_IDX(IWEVASSOCRESPIE)] = {
300 .header_type = IW_HEADER_TYPE_POINT,
301 .token_size = 1,
302 .max_tokens = IW_GENERIC_IE_MAX,
303 },
304 [IW_EVENT_IDX(IWEVPMKIDCAND)] = {
305 .header_type = IW_HEADER_TYPE_POINT,
306 .token_size = 1,
307 .max_tokens = sizeof(struct iw_pmkid_cand),
308 },
309};
310static const unsigned int standard_event_num = ARRAY_SIZE(standard_event);
311
312/* Size (in bytes) of various events */
313static const int event_type_size[] = {
314 IW_EV_LCP_LEN, /* IW_HEADER_TYPE_NULL */
315 0,
316 IW_EV_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
317 0,
318 IW_EV_UINT_LEN, /* IW_HEADER_TYPE_UINT */
319 IW_EV_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
320 IW_EV_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
321 0,
322 IW_EV_POINT_LEN, /* Without variable payload */
323 IW_EV_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
324 IW_EV_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
325};
326
327#ifdef CONFIG_COMPAT
328static const int compat_event_type_size[] = {
329 IW_EV_COMPAT_LCP_LEN, /* IW_HEADER_TYPE_NULL */
330 0,
331 IW_EV_COMPAT_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
332 0,
333 IW_EV_COMPAT_UINT_LEN, /* IW_HEADER_TYPE_UINT */
334 IW_EV_COMPAT_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
335 IW_EV_COMPAT_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
336 0,
337 IW_EV_COMPAT_POINT_LEN, /* Without variable payload */
338 IW_EV_COMPAT_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
339 IW_EV_COMPAT_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
340};
341#endif
342
343
344/* IW event code */
345
346void wireless_nlevent_flush(void)
347{
348 struct sk_buff *skb;
349 struct net *net;
350
351 down_read(&net_rwsem);
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 up_read(&net_rwsem);
358}
359EXPORT_SYMBOL_GPL(wireless_nlevent_flush);
360
361static int wext_netdev_notifier_call(struct notifier_block *nb,
362 unsigned long state, void *ptr)
363{
364 /*
365 * When a netdev changes state in any way, flush all pending messages
366 * to avoid them going out in a strange order, e.g. RTM_NEWLINK after
367 * RTM_DELLINK, or with IFF_UP after without IFF_UP during dev_close()
368 * or similar - all of which could otherwise happen due to delays from
369 * schedule_work().
370 */
371 wireless_nlevent_flush();
372
373 return NOTIFY_OK;
374}
375
376static struct notifier_block wext_netdev_notifier = {
377 .notifier_call = wext_netdev_notifier_call,
378};
379
380static int __net_init wext_pernet_init(struct net *net)
381{
382 skb_queue_head_init(&net->wext_nlevents);
383 return 0;
384}
385
386static void __net_exit wext_pernet_exit(struct net *net)
387{
388 skb_queue_purge(&net->wext_nlevents);
389}
390
391static struct pernet_operations wext_pernet_ops = {
392 .init = wext_pernet_init,
393 .exit = wext_pernet_exit,
394};
395
396static int __init wireless_nlevent_init(void)
397{
398 int err = register_pernet_subsys(&wext_pernet_ops);
399
400 if (err)
401 return err;
402
403 err = register_netdevice_notifier(&wext_netdev_notifier);
404 if (err)
405 unregister_pernet_subsys(&wext_pernet_ops);
406 return err;
407}
408
409subsys_initcall(wireless_nlevent_init);
410
411/* Process events generated by the wireless layer or the driver. */
412static void wireless_nlevent_process(struct work_struct *work)
413{
414 wireless_nlevent_flush();
415}
416
417static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
418
419static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
420 struct sk_buff *skb)
421{
422 struct ifinfomsg *r;
423 struct nlmsghdr *nlh;
424
425 nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
426 if (!nlh)
427 return NULL;
428
429 r = nlmsg_data(nlh);
430 r->ifi_family = AF_UNSPEC;
431 r->__ifi_pad = 0;
432 r->ifi_type = dev->type;
433 r->ifi_index = dev->ifindex;
434 r->ifi_flags = dev_get_flags(dev);
435 r->ifi_change = 0; /* Wireless changes don't affect those flags */
436
437 if (nla_put_string(skb, IFLA_IFNAME, dev->name))
438 goto nla_put_failure;
439
440 return nlh;
441 nla_put_failure:
442 nlmsg_cancel(skb, nlh);
443 return NULL;
444}
445
446
447/*
448 * Main event dispatcher. Called from other parts and drivers.
449 * Send the event on the appropriate channels.
450 * May be called from interrupt context.
451 */
452void wireless_send_event(struct net_device * dev,
453 unsigned int cmd,
454 union iwreq_data * wrqu,
455 const char * extra)
456{
457 const struct iw_ioctl_description * descr = NULL;
458 int extra_len = 0;
459 struct iw_event *event; /* Mallocated whole event */
460 int event_len; /* Its size */
461 int hdr_len; /* Size of the event header */
462 int wrqu_off = 0; /* Offset in wrqu */
463 /* Don't "optimise" the following variable, it will crash */
464 unsigned int cmd_index; /* *MUST* be unsigned */
465 struct sk_buff *skb;
466 struct nlmsghdr *nlh;
467 struct nlattr *nla;
468#ifdef CONFIG_COMPAT
469 struct __compat_iw_event *compat_event;
470 struct compat_iw_point compat_wrqu;
471 struct sk_buff *compskb;
472 int ptr_len;
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
588 /* ptr_len is remaining size in event header apart from LCP */
589 ptr_len = hdr_len - IW_EV_COMPAT_LCP_LEN;
590 event_len = hdr_len + extra_len;
591
592 compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
593 if (!compskb) {
594 kfree_skb(skb);
595 return;
596 }
597
598 /* Send via the RtNetlink event channel */
599 nlh = rtnetlink_ifinfo_prep(dev, compskb);
600 if (WARN_ON(!nlh)) {
601 kfree_skb(skb);
602 kfree_skb(compskb);
603 return;
604 }
605
606 /* Add the wireless events in the netlink packet */
607 nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
608 if (!nla) {
609 kfree_skb(skb);
610 kfree_skb(compskb);
611 return;
612 }
613 compat_event = nla_data(nla);
614
615 compat_event->len = event_len;
616 compat_event->cmd = cmd;
617 if (descr->header_type == IW_HEADER_TYPE_POINT) {
618 compat_wrqu.length = wrqu->data.length;
619 compat_wrqu.flags = wrqu->data.flags;
620 memcpy(compat_event->ptr_bytes,
621 ((char *)&compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
622 ptr_len);
623 if (extra_len)
624 memcpy(&compat_event->ptr_bytes[ptr_len],
625 extra, extra_len);
626 } else {
627 /* extra_len must be zero, so no if (extra) needed */
628 memcpy(compat_event->ptr_bytes, wrqu, ptr_len);
629 }
630
631 nlmsg_end(compskb, nlh);
632
633 skb_shinfo(skb)->frag_list = compskb;
634#endif
635 skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
636 schedule_work(&wireless_nlevent_work);
637}
638EXPORT_SYMBOL(wireless_send_event);
639
640#ifdef CONFIG_CFG80211_WEXT
641static void wireless_warn_cfg80211_wext(void)
642{
643 char name[sizeof(current->comm)];
644
645 pr_warn_once("warning: `%s' uses wireless extensions which will stop working for Wi-Fi 7 hardware; use nl80211\n",
646 get_task_comm(name, current));
647}
648#endif
649
650/* IW handlers */
651
652struct iw_statistics *get_wireless_stats(struct net_device *dev)
653{
654#ifdef CONFIG_WIRELESS_EXT
655 if ((dev->wireless_handlers != NULL) &&
656 (dev->wireless_handlers->get_wireless_stats != NULL))
657 return dev->wireless_handlers->get_wireless_stats(dev);
658#endif
659
660#ifdef CONFIG_CFG80211_WEXT
661 if (dev->ieee80211_ptr &&
662 dev->ieee80211_ptr->wiphy &&
663 dev->ieee80211_ptr->wiphy->wext &&
664 dev->ieee80211_ptr->wiphy->wext->get_wireless_stats) {
665 wireless_warn_cfg80211_wext();
666 if (dev->ieee80211_ptr->wiphy->flags & (WIPHY_FLAG_SUPPORTS_MLO |
667 WIPHY_FLAG_DISABLE_WEXT))
668 return NULL;
669 return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
670 }
671#endif
672
673 /* not found */
674 return NULL;
675}
676
677/* noinline to avoid a bogus warning with -O3 */
678static noinline int iw_handler_get_iwstats(struct net_device * dev,
679 struct iw_request_info * info,
680 union iwreq_data * wrqu,
681 char * extra)
682{
683 /* Get stats from the driver */
684 struct iw_statistics *stats;
685
686 stats = get_wireless_stats(dev);
687 if (stats) {
688 /* Copy statistics to extra */
689 memcpy(extra, stats, sizeof(struct iw_statistics));
690 wrqu->data.length = sizeof(struct iw_statistics);
691
692 /* Check if we need to clear the updated flag */
693 if (wrqu->data.flags != 0)
694 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
695 return 0;
696 } else
697 return -EOPNOTSUPP;
698}
699
700static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
701{
702 /* Don't "optimise" the following variable, it will crash */
703 unsigned int index; /* *MUST* be unsigned */
704 const struct iw_handler_def *handlers = NULL;
705
706#ifdef CONFIG_CFG80211_WEXT
707 if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy) {
708 wireless_warn_cfg80211_wext();
709 if (dev->ieee80211_ptr->wiphy->flags & (WIPHY_FLAG_SUPPORTS_MLO |
710 WIPHY_FLAG_DISABLE_WEXT))
711 return NULL;
712 handlers = dev->ieee80211_ptr->wiphy->wext;
713 }
714#endif
715#ifdef CONFIG_WIRELESS_EXT
716 if (dev->wireless_handlers)
717 handlers = dev->wireless_handlers;
718#endif
719
720 if (!handlers)
721 return NULL;
722
723 /* Try as a standard command */
724 index = IW_IOCTL_IDX(cmd);
725 if (index < handlers->num_standard)
726 return handlers->standard[index];
727
728#ifdef CONFIG_WEXT_PRIV
729 /* Try as a private command */
730 index = cmd - SIOCIWFIRSTPRIV;
731 if (index < handlers->num_private)
732 return handlers->private[index];
733#endif
734
735 /* Not found */
736 return NULL;
737}
738
739static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
740 const struct iw_ioctl_description *descr,
741 iw_handler handler, struct net_device *dev,
742 struct iw_request_info *info)
743{
744 int err, extra_size, user_length = 0, essid_compat = 0;
745 char *extra;
746
747 /* Calculate space needed by arguments. Always allocate
748 * for max space.
749 */
750 extra_size = descr->max_tokens * descr->token_size;
751
752 /* Check need for ESSID compatibility for WE < 21 */
753 switch (cmd) {
754 case SIOCSIWESSID:
755 case SIOCGIWESSID:
756 case SIOCSIWNICKN:
757 case SIOCGIWNICKN:
758 if (iwp->length == descr->max_tokens + 1)
759 essid_compat = 1;
760 else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
761 char essid[IW_ESSID_MAX_SIZE + 1];
762 unsigned int len;
763 len = iwp->length * descr->token_size;
764
765 if (len > IW_ESSID_MAX_SIZE)
766 return -EFAULT;
767
768 err = copy_from_user(essid, iwp->pointer, len);
769 if (err)
770 return -EFAULT;
771
772 if (essid[iwp->length - 1] == '\0')
773 essid_compat = 1;
774 }
775 break;
776 default:
777 break;
778 }
779
780 iwp->length -= essid_compat;
781
782 /* Check what user space is giving us */
783 if (IW_IS_SET(cmd)) {
784 /* Check NULL pointer */
785 if (!iwp->pointer && iwp->length != 0)
786 return -EFAULT;
787 /* Check if number of token fits within bounds */
788 if (iwp->length > descr->max_tokens)
789 return -E2BIG;
790 if (iwp->length < descr->min_tokens)
791 return -EINVAL;
792 } else {
793 /* Check NULL pointer */
794 if (!iwp->pointer)
795 return -EFAULT;
796 /* Save user space buffer size for checking */
797 user_length = iwp->length;
798
799 /* Don't check if user_length > max to allow forward
800 * compatibility. The test user_length < min is
801 * implied by the test at the end.
802 */
803
804 /* Support for very large requests */
805 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
806 (user_length > descr->max_tokens)) {
807 /* Allow userspace to GET more than max so
808 * we can support any size GET requests.
809 * There is still a limit : -ENOMEM.
810 */
811 extra_size = user_length * descr->token_size;
812
813 /* Note : user_length is originally a __u16,
814 * and token_size is controlled by us,
815 * so extra_size won't get negative and
816 * won't overflow...
817 */
818 }
819 }
820
821 /* Sanity-check to ensure we never end up _allocating_ zero
822 * bytes of data for extra.
823 */
824 if (extra_size <= 0)
825 return -EFAULT;
826
827 /* kzalloc() ensures NULL-termination for essid_compat. */
828 extra = kzalloc(extra_size, GFP_KERNEL);
829 if (!extra)
830 return -ENOMEM;
831
832 /* If it is a SET, get all the extra data in here */
833 if (IW_IS_SET(cmd) && (iwp->length != 0)) {
834 if (copy_from_user(extra, iwp->pointer,
835 iwp->length *
836 descr->token_size)) {
837 err = -EFAULT;
838 goto out;
839 }
840
841 if (cmd == SIOCSIWENCODEEXT) {
842 struct iw_encode_ext *ee = (void *) extra;
843
844 if (iwp->length < sizeof(*ee) + ee->key_len) {
845 err = -EFAULT;
846 goto out;
847 }
848 }
849 }
850
851 if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
852 /*
853 * If this is a GET, but not NOMAX, it means that the extra
854 * data is not bounded by userspace, but by max_tokens. Thus
855 * set the length to max_tokens. This matches the extra data
856 * allocation.
857 * The driver should fill it with the number of tokens it
858 * provided, and it may check iwp->length rather than having
859 * knowledge of max_tokens. If the driver doesn't change the
860 * iwp->length, this ioctl just copies back max_token tokens
861 * filled with zeroes. Hopefully the driver isn't claiming
862 * them to be valid data.
863 */
864 iwp->length = descr->max_tokens;
865 }
866
867 err = handler(dev, info, (union iwreq_data *) iwp, extra);
868
869 iwp->length += essid_compat;
870
871 /* If we have something to return to the user */
872 if (!err && IW_IS_GET(cmd)) {
873 /* Check if there is enough buffer up there */
874 if (user_length < iwp->length) {
875 err = -E2BIG;
876 goto out;
877 }
878
879 if (copy_to_user(iwp->pointer, extra,
880 iwp->length *
881 descr->token_size)) {
882 err = -EFAULT;
883 goto out;
884 }
885 }
886
887 /* Generate an event to notify listeners of the change */
888 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
889 ((err == 0) || (err == -EIWCOMMIT))) {
890 union iwreq_data *data = (union iwreq_data *) iwp;
891
892 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
893 /* If the event is restricted, don't
894 * export the payload.
895 */
896 wireless_send_event(dev, cmd, data, NULL);
897 else
898 wireless_send_event(dev, cmd, data, extra);
899 }
900
901out:
902 kfree(extra);
903 return err;
904}
905
906/*
907 * Call the commit handler in the driver
908 * (if exist and if conditions are right)
909 *
910 * Note : our current commit strategy is currently pretty dumb,
911 * but we will be able to improve on that...
912 * The goal is to try to agreagate as many changes as possible
913 * before doing the commit. Drivers that will define a commit handler
914 * are usually those that need a reset after changing parameters, so
915 * we want to minimise the number of reset.
916 * A cool idea is to use a timer : at each "set" command, we re-set the
917 * timer, when the timer eventually fires, we call the driver.
918 * Hopefully, more on that later.
919 *
920 * Also, I'm waiting to see how many people will complain about the
921 * netif_running(dev) test. I'm open on that one...
922 * Hopefully, the driver will remember to do a commit in "open()" ;-)
923 */
924int call_commit_handler(struct net_device *dev)
925{
926#ifdef CONFIG_WIRELESS_EXT
927 if (netif_running(dev) &&
928 dev->wireless_handlers &&
929 dev->wireless_handlers->standard[0])
930 /* Call the commit handler on the driver */
931 return dev->wireless_handlers->standard[0](dev, NULL,
932 NULL, NULL);
933 else
934 return 0; /* Command completed successfully */
935#else
936 /* cfg80211 has no commit */
937 return 0;
938#endif
939}
940
941/*
942 * Main IOCTl dispatcher.
943 * Check the type of IOCTL and call the appropriate wrapper...
944 */
945static int wireless_process_ioctl(struct net *net, struct iwreq *iwr,
946 unsigned int cmd,
947 struct iw_request_info *info,
948 wext_ioctl_func standard,
949 wext_ioctl_func private)
950{
951 struct net_device *dev;
952 iw_handler handler;
953
954 /* Permissions are already checked in dev_ioctl() before calling us.
955 * The copy_to/from_user() of ifr is also dealt with in there */
956
957 /* Make sure the device exist */
958 if ((dev = __dev_get_by_name(net, iwr->ifr_name)) == NULL)
959 return -ENODEV;
960
961 /* A bunch of special cases, then the generic case...
962 * Note that 'cmd' is already filtered in dev_ioctl() with
963 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
964 if (cmd == SIOCGIWSTATS)
965 return standard(dev, iwr, cmd, info,
966 &iw_handler_get_iwstats);
967
968#ifdef CONFIG_WEXT_PRIV
969 if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
970 return standard(dev, iwr, cmd, info,
971 iw_handler_get_private);
972#endif
973
974 /* Basic check */
975 if (!netif_device_present(dev))
976 return -ENODEV;
977
978 /* New driver API : try to find the handler */
979 handler = get_handler(dev, cmd);
980 if (handler) {
981 /* Standard and private are not the same */
982 if (cmd < SIOCIWFIRSTPRIV)
983 return standard(dev, iwr, cmd, info, handler);
984 else if (private)
985 return private(dev, iwr, cmd, info, handler);
986 }
987 return -EOPNOTSUPP;
988}
989
990/* If command is `set a parameter', or `get the encoding parameters',
991 * check if the user has the right to do it.
992 */
993static int wext_permission_check(unsigned int cmd)
994{
995 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
996 cmd == SIOCGIWENCODEEXT) &&
997 !capable(CAP_NET_ADMIN))
998 return -EPERM;
999
1000 return 0;
1001}
1002
1003/* entry point from dev ioctl */
1004static int wext_ioctl_dispatch(struct net *net, struct iwreq *iwr,
1005 unsigned int cmd, struct iw_request_info *info,
1006 wext_ioctl_func standard,
1007 wext_ioctl_func private)
1008{
1009 int ret = wext_permission_check(cmd);
1010
1011 if (ret)
1012 return ret;
1013
1014 dev_load(net, iwr->ifr_name);
1015 rtnl_lock();
1016 ret = wireless_process_ioctl(net, iwr, cmd, info, standard, private);
1017 rtnl_unlock();
1018
1019 return ret;
1020}
1021
1022/*
1023 * Wrapper to call a standard Wireless Extension handler.
1024 * We do various checks and also take care of moving data between
1025 * user space and kernel space.
1026 */
1027static int ioctl_standard_call(struct net_device * dev,
1028 struct iwreq *iwr,
1029 unsigned int cmd,
1030 struct iw_request_info *info,
1031 iw_handler handler)
1032{
1033 const struct iw_ioctl_description * descr;
1034 int ret = -EINVAL;
1035
1036 /* Get the description of the IOCTL */
1037 if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
1038 return -EOPNOTSUPP;
1039 descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
1040
1041 /* Check if we have a pointer to user space data or not */
1042 if (descr->header_type != IW_HEADER_TYPE_POINT) {
1043
1044 /* No extra arguments. Trivial to handle */
1045 ret = handler(dev, info, &(iwr->u), NULL);
1046
1047 /* Generate an event to notify listeners of the change */
1048 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
1049 ((ret == 0) || (ret == -EIWCOMMIT)))
1050 wireless_send_event(dev, cmd, &(iwr->u), NULL);
1051 } else {
1052 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
1053 handler, dev, info);
1054 }
1055
1056 /* Call commit handler if needed and defined */
1057 if (ret == -EIWCOMMIT)
1058 ret = call_commit_handler(dev);
1059
1060 /* Here, we will generate the appropriate event if needed */
1061
1062 return ret;
1063}
1064
1065
1066int wext_handle_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1067{
1068 struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1069 struct iwreq iwr;
1070 int ret;
1071
1072 if (copy_from_user(&iwr, arg, sizeof(iwr)))
1073 return -EFAULT;
1074
1075 iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0;
1076
1077 ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1078 ioctl_standard_call,
1079 ioctl_private_call);
1080 if (ret >= 0 &&
1081 IW_IS_GET(cmd) &&
1082 copy_to_user(arg, &iwr, sizeof(struct iwreq)))
1083 return -EFAULT;
1084
1085 return ret;
1086}
1087
1088#ifdef CONFIG_COMPAT
1089static int compat_standard_call(struct net_device *dev,
1090 struct iwreq *iwr,
1091 unsigned int cmd,
1092 struct iw_request_info *info,
1093 iw_handler handler)
1094{
1095 const struct iw_ioctl_description *descr;
1096 struct compat_iw_point *iwp_compat;
1097 struct iw_point iwp;
1098 int err;
1099
1100 descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1101
1102 if (descr->header_type != IW_HEADER_TYPE_POINT)
1103 return ioctl_standard_call(dev, iwr, cmd, info, handler);
1104
1105 iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1106 iwp.pointer = compat_ptr(iwp_compat->pointer);
1107 iwp.length = iwp_compat->length;
1108 iwp.flags = iwp_compat->flags;
1109
1110 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1111
1112 iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1113 iwp_compat->length = iwp.length;
1114 iwp_compat->flags = iwp.flags;
1115
1116 return err;
1117}
1118
1119int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1120 unsigned long arg)
1121{
1122 void __user *argp = (void __user *)arg;
1123 struct iw_request_info info;
1124 struct iwreq iwr;
1125 char *colon;
1126 int ret;
1127
1128 if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1129 return -EFAULT;
1130
1131 iwr.ifr_name[IFNAMSIZ-1] = 0;
1132 colon = strchr(iwr.ifr_name, ':');
1133 if (colon)
1134 *colon = 0;
1135
1136 info.cmd = cmd;
1137 info.flags = IW_REQUEST_FLAG_COMPAT;
1138
1139 ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1140 compat_standard_call,
1141 compat_private_call);
1142
1143 if (ret >= 0 &&
1144 IW_IS_GET(cmd) &&
1145 copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1146 return -EFAULT;
1147
1148 return ret;
1149}
1150#endif
1151
1152char *iwe_stream_add_event(struct iw_request_info *info, char *stream,
1153 char *ends, struct iw_event *iwe, int event_len)
1154{
1155 int lcp_len = iwe_stream_lcp_len(info);
1156
1157 event_len = iwe_stream_event_len_adjust(info, event_len);
1158
1159 /* Check if it's possible */
1160 if (likely((stream + event_len) < ends)) {
1161 iwe->len = event_len;
1162 /* Beware of alignment issues on 64 bits */
1163 memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1164 memcpy(stream + lcp_len, &iwe->u,
1165 event_len - lcp_len);
1166 stream += event_len;
1167 }
1168
1169 return stream;
1170}
1171EXPORT_SYMBOL(iwe_stream_add_event);
1172
1173char *iwe_stream_add_point(struct iw_request_info *info, char *stream,
1174 char *ends, struct iw_event *iwe, char *extra)
1175{
1176 int event_len = iwe_stream_point_len(info) + iwe->u.data.length;
1177 int point_len = iwe_stream_point_len(info);
1178 int lcp_len = iwe_stream_lcp_len(info);
1179
1180 /* Check if it's possible */
1181 if (likely((stream + event_len) < ends)) {
1182 iwe->len = event_len;
1183 memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1184 memcpy(stream + lcp_len,
1185 ((char *) &iwe->u) + IW_EV_POINT_OFF,
1186 IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN);
1187 if (iwe->u.data.length && extra)
1188 memcpy(stream + point_len, extra, iwe->u.data.length);
1189 stream += event_len;
1190 }
1191
1192 return stream;
1193}
1194EXPORT_SYMBOL(iwe_stream_add_point);
1195
1196char *iwe_stream_add_value(struct iw_request_info *info, char *event,
1197 char *value, char *ends, struct iw_event *iwe,
1198 int event_len)
1199{
1200 int lcp_len = iwe_stream_lcp_len(info);
1201
1202 /* Don't duplicate LCP */
1203 event_len -= IW_EV_LCP_LEN;
1204
1205 /* Check if it's possible */
1206 if (likely((value + event_len) < ends)) {
1207 /* Add new value */
1208 memcpy(value, &iwe->u, event_len);
1209 value += event_len;
1210 /* Patch LCP */
1211 iwe->len = value - event;
1212 memcpy(event, (char *) iwe, lcp_len);
1213 }
1214
1215 return value;
1216}
1217EXPORT_SYMBOL(iwe_stream_add_value);