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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * This file implement the Wireless Extensions core API.
4 *
5 * Authors : Jean Tourrilhes - HPL - <[email protected]>
6 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
7 * Copyright 2009 Johannes Berg <[email protected]>
8 * Copyright (C) 2024 Intel Corporation
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 down_read(&net_rwsem);
351 for_each_net(net) {
352 while ((skb = skb_dequeue(&net->wext_nlevents)))
353 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL,
354 GFP_KERNEL);
355 }
356 up_read(&net_rwsem);
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 wireless_nlevent_flush();
414}
415
416static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
417
418static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
419 struct sk_buff *skb)
420{
421 struct ifinfomsg *r;
422 struct nlmsghdr *nlh;
423
424 nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
425 if (!nlh)
426 return NULL;
427
428 r = nlmsg_data(nlh);
429 r->ifi_family = AF_UNSPEC;
430 r->__ifi_pad = 0;
431 r->ifi_type = dev->type;
432 r->ifi_index = dev->ifindex;
433 r->ifi_flags = netif_get_flags(dev);
434 r->ifi_change = 0; /* Wireless changes don't affect those flags */
435
436 if (nla_put_string(skb, IFLA_IFNAME, dev->name))
437 goto nla_put_failure;
438
439 return nlh;
440 nla_put_failure:
441 nlmsg_cancel(skb, nlh);
442 return NULL;
443}
444
445
446/*
447 * Main event dispatcher. Called from other parts and drivers.
448 * Send the event on the appropriate channels.
449 * May be called from interrupt context.
450 */
451void wireless_send_event(struct net_device * dev,
452 unsigned int cmd,
453 union iwreq_data * wrqu,
454 const char * extra)
455{
456 const struct iw_ioctl_description * descr = NULL;
457 int extra_len = 0;
458 struct iw_event *event; /* Mallocated whole event */
459 int event_len; /* Its size */
460 int hdr_len; /* Size of the event header */
461 int wrqu_off = 0; /* Offset in wrqu */
462 /* Don't "optimise" the following variable, it will crash */
463 unsigned int cmd_index; /* *MUST* be unsigned */
464 struct sk_buff *skb;
465 struct nlmsghdr *nlh;
466 struct nlattr *nla;
467#ifdef CONFIG_COMPAT
468 struct __compat_iw_event *compat_event;
469 struct compat_iw_point compat_wrqu;
470 struct sk_buff *compskb;
471 int ptr_len;
472#endif
473
474 /*
475 * Nothing in the kernel sends scan events with data, be safe.
476 * This is necessary because we cannot fix up scan event data
477 * for compat, due to being contained in 'extra', but normally
478 * applications are required to retrieve the scan data anyway
479 * and no data is included in the event, this codifies that
480 * practice.
481 */
482 if (WARN_ON(cmd == SIOCGIWSCAN && extra))
483 extra = NULL;
484
485 /* Get the description of the Event */
486 if (cmd <= SIOCIWLAST) {
487 cmd_index = IW_IOCTL_IDX(cmd);
488 if (cmd_index < standard_ioctl_num)
489 descr = &(standard_ioctl[cmd_index]);
490 } else {
491 cmd_index = IW_EVENT_IDX(cmd);
492 if (cmd_index < standard_event_num)
493 descr = &(standard_event[cmd_index]);
494 }
495 /* Don't accept unknown events */
496 if (descr == NULL) {
497 /* Note : we don't return an error to the driver, because
498 * the driver would not know what to do about it. It can't
499 * return an error to the user, because the event is not
500 * initiated by a user request.
501 * The best the driver could do is to log an error message.
502 * We will do it ourselves instead...
503 */
504 netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
505 cmd);
506 return;
507 }
508
509 /* Check extra parameters and set extra_len */
510 if (descr->header_type == IW_HEADER_TYPE_POINT) {
511 /* Check if number of token fits within bounds */
512 if (wrqu->data.length > descr->max_tokens) {
513 netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too big (%d)\n",
514 cmd, wrqu->data.length);
515 return;
516 }
517 if (wrqu->data.length < descr->min_tokens) {
518 netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too small (%d)\n",
519 cmd, wrqu->data.length);
520 return;
521 }
522 /* Calculate extra_len - extra is NULL for restricted events */
523 if (extra != NULL)
524 extra_len = wrqu->data.length * descr->token_size;
525 /* Always at an offset in wrqu */
526 wrqu_off = IW_EV_POINT_OFF;
527 }
528
529 /* Total length of the event */
530 hdr_len = event_type_size[descr->header_type];
531 event_len = hdr_len + extra_len;
532
533 /*
534 * The problem for 64/32 bit.
535 *
536 * On 64-bit, a regular event is laid out as follows:
537 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
538 * | event.len | event.cmd | p a d d i n g |
539 * | wrqu data ... (with the correct size) |
540 *
541 * This padding exists because we manipulate event->u,
542 * and 'event' is not packed.
543 *
544 * An iw_point event is laid out like this instead:
545 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
546 * | event.len | event.cmd | p a d d i n g |
547 * | iwpnt.len | iwpnt.flg | p a d d i n g |
548 * | extra data ...
549 *
550 * The second padding exists because struct iw_point is extended,
551 * but this depends on the platform...
552 *
553 * On 32-bit, all the padding shouldn't be there.
554 */
555
556 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
557 if (!skb)
558 return;
559
560 /* Send via the RtNetlink event channel */
561 nlh = rtnetlink_ifinfo_prep(dev, skb);
562 if (WARN_ON(!nlh)) {
563 kfree_skb(skb);
564 return;
565 }
566
567 /* Add the wireless events in the netlink packet */
568 nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
569 if (!nla) {
570 kfree_skb(skb);
571 return;
572 }
573 event = nla_data(nla);
574
575 /* Fill event - first clear to avoid data leaking */
576 memset(event, 0, hdr_len);
577 event->len = event_len;
578 event->cmd = cmd;
579 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
580 if (extra_len)
581 memcpy(((char *) event) + hdr_len, extra, extra_len);
582
583 nlmsg_end(skb, nlh);
584#ifdef CONFIG_COMPAT
585 hdr_len = compat_event_type_size[descr->header_type];
586
587 /* ptr_len is remaining size in event header apart from LCP */
588 ptr_len = hdr_len - IW_EV_COMPAT_LCP_LEN;
589 event_len = hdr_len + extra_len;
590
591 compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
592 if (!compskb) {
593 kfree_skb(skb);
594 return;
595 }
596
597 /* Send via the RtNetlink event channel */
598 nlh = rtnetlink_ifinfo_prep(dev, compskb);
599 if (WARN_ON(!nlh)) {
600 kfree_skb(skb);
601 kfree_skb(compskb);
602 return;
603 }
604
605 /* Add the wireless events in the netlink packet */
606 nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
607 if (!nla) {
608 kfree_skb(skb);
609 kfree_skb(compskb);
610 return;
611 }
612 compat_event = nla_data(nla);
613
614 compat_event->len = event_len;
615 compat_event->cmd = cmd;
616 if (descr->header_type == IW_HEADER_TYPE_POINT) {
617 compat_wrqu.length = wrqu->data.length;
618 compat_wrqu.flags = wrqu->data.flags;
619 memcpy(compat_event->ptr_bytes,
620 ((char *)&compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
621 ptr_len);
622 if (extra_len)
623 memcpy(&compat_event->ptr_bytes[ptr_len],
624 extra, extra_len);
625 } else {
626 /* extra_len must be zero, so no if (extra) needed */
627 memcpy(compat_event->ptr_bytes, wrqu, ptr_len);
628 }
629
630 nlmsg_end(compskb, nlh);
631
632 skb_shinfo(skb)->frag_list = compskb;
633#endif
634 skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
635 schedule_work(&wireless_nlevent_work);
636}
637EXPORT_SYMBOL(wireless_send_event);
638
639#ifdef CONFIG_CFG80211_WEXT
640static void wireless_warn_cfg80211_wext(void)
641{
642 pr_warn_once("warning: `%s' uses wireless extensions which will stop working for Wi-Fi 7 hardware; use nl80211\n",
643 current->comm);
644}
645#endif
646
647/* IW handlers */
648
649struct iw_statistics *get_wireless_stats(struct net_device *dev)
650{
651#ifdef CONFIG_WIRELESS_EXT
652 if ((dev->wireless_handlers != NULL) &&
653 (dev->wireless_handlers->get_wireless_stats != NULL))
654 return dev->wireless_handlers->get_wireless_stats(dev);
655#endif
656
657#ifdef CONFIG_CFG80211_WEXT
658 if (dev->ieee80211_ptr &&
659 dev->ieee80211_ptr->wiphy &&
660 dev->ieee80211_ptr->wiphy->wext &&
661 dev->ieee80211_ptr->wiphy->wext->get_wireless_stats) {
662 wireless_warn_cfg80211_wext();
663 if (dev->ieee80211_ptr->wiphy->flags & WIPHY_FLAG_SUPPORTS_MLO)
664 return NULL;
665 return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
666 }
667#endif
668
669 /* not found */
670 return NULL;
671}
672
673/* noinline to avoid a bogus warning with -O3 */
674static noinline int iw_handler_get_iwstats(struct net_device * dev,
675 struct iw_request_info * info,
676 union iwreq_data * wrqu,
677 char * extra)
678{
679 /* Get stats from the driver */
680 struct iw_statistics *stats;
681
682 stats = get_wireless_stats(dev);
683 if (stats) {
684 /* Copy statistics to extra */
685 memcpy(extra, stats, sizeof(struct iw_statistics));
686 wrqu->data.length = sizeof(struct iw_statistics);
687
688 /* Check if we need to clear the updated flag */
689 if (wrqu->data.flags != 0)
690 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
691 return 0;
692 } else
693 return -EOPNOTSUPP;
694}
695
696static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
697{
698 /* Don't "optimise" the following variable, it will crash */
699 unsigned int index; /* *MUST* be unsigned */
700 const struct iw_handler_def *handlers = NULL;
701
702#ifdef CONFIG_CFG80211_WEXT
703 if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy) {
704 wireless_warn_cfg80211_wext();
705 if (dev->ieee80211_ptr->wiphy->flags & WIPHY_FLAG_SUPPORTS_MLO)
706 return NULL;
707 handlers = dev->ieee80211_ptr->wiphy->wext;
708 }
709#endif
710#ifdef CONFIG_WIRELESS_EXT
711 if (dev->wireless_handlers)
712 handlers = dev->wireless_handlers;
713#endif
714
715 if (!handlers)
716 return NULL;
717
718 /* Try as a standard command */
719 index = IW_IOCTL_IDX(cmd);
720 if (index < handlers->num_standard)
721 return handlers->standard[index];
722
723#ifdef CONFIG_WEXT_PRIV
724 /* Try as a private command */
725 index = cmd - SIOCIWFIRSTPRIV;
726 if (index < handlers->num_private)
727 return handlers->private[index];
728#endif
729
730 /* Not found */
731 return NULL;
732}
733
734static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
735 const struct iw_ioctl_description *descr,
736 iw_handler handler, struct net_device *dev,
737 struct iw_request_info *info)
738{
739 int err, extra_size, user_length = 0, essid_compat = 0;
740 char *extra;
741
742 /* Calculate space needed by arguments. Always allocate
743 * for max space.
744 */
745 extra_size = descr->max_tokens * descr->token_size;
746
747 /* Check need for ESSID compatibility for WE < 21 */
748 switch (cmd) {
749 case SIOCSIWESSID:
750 case SIOCGIWESSID:
751 case SIOCSIWNICKN:
752 case SIOCGIWNICKN:
753 if (iwp->length == descr->max_tokens + 1)
754 essid_compat = 1;
755 else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
756 char essid[IW_ESSID_MAX_SIZE + 1];
757 unsigned int len;
758 len = iwp->length * descr->token_size;
759
760 if (len > IW_ESSID_MAX_SIZE)
761 return -EFAULT;
762
763 err = copy_from_user(essid, iwp->pointer, len);
764 if (err)
765 return -EFAULT;
766
767 if (essid[iwp->length - 1] == '\0')
768 essid_compat = 1;
769 }
770 break;
771 default:
772 break;
773 }
774
775 iwp->length -= essid_compat;
776
777 /* Check what user space is giving us */
778 if (IW_IS_SET(cmd)) {
779 /* Check NULL pointer */
780 if (!iwp->pointer && iwp->length != 0)
781 return -EFAULT;
782 /* Check if number of token fits within bounds */
783 if (iwp->length > descr->max_tokens)
784 return -E2BIG;
785 if (iwp->length < descr->min_tokens)
786 return -EINVAL;
787 } else {
788 /* Check NULL pointer */
789 if (!iwp->pointer)
790 return -EFAULT;
791 /* Save user space buffer size for checking */
792 user_length = iwp->length;
793
794 /* Don't check if user_length > max to allow forward
795 * compatibility. The test user_length < min is
796 * implied by the test at the end.
797 */
798
799 /* Support for very large requests */
800 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
801 (user_length > descr->max_tokens)) {
802 /* Allow userspace to GET more than max so
803 * we can support any size GET requests.
804 * There is still a limit : -ENOMEM.
805 */
806 extra_size = user_length * descr->token_size;
807
808 /* Note : user_length is originally a __u16,
809 * and token_size is controlled by us,
810 * so extra_size won't get negative and
811 * won't overflow...
812 */
813 }
814 }
815
816 /* Sanity-check to ensure we never end up _allocating_ zero
817 * bytes of data for extra.
818 */
819 if (extra_size <= 0)
820 return -EFAULT;
821
822 /* kzalloc() ensures NULL-termination for essid_compat. */
823 extra = kzalloc(extra_size, GFP_KERNEL);
824 if (!extra)
825 return -ENOMEM;
826
827 /* If it is a SET, get all the extra data in here */
828 if (IW_IS_SET(cmd) && (iwp->length != 0)) {
829 if (copy_from_user(extra, iwp->pointer,
830 iwp->length *
831 descr->token_size)) {
832 err = -EFAULT;
833 goto out;
834 }
835
836 if (cmd == SIOCSIWENCODEEXT) {
837 struct iw_encode_ext *ee = (void *) extra;
838
839 if (iwp->length < sizeof(*ee) + ee->key_len) {
840 err = -EFAULT;
841 goto out;
842 }
843 }
844 }
845
846 if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
847 /*
848 * If this is a GET, but not NOMAX, it means that the extra
849 * data is not bounded by userspace, but by max_tokens. Thus
850 * set the length to max_tokens. This matches the extra data
851 * allocation.
852 * The driver should fill it with the number of tokens it
853 * provided, and it may check iwp->length rather than having
854 * knowledge of max_tokens. If the driver doesn't change the
855 * iwp->length, this ioctl just copies back max_token tokens
856 * filled with zeroes. Hopefully the driver isn't claiming
857 * them to be valid data.
858 */
859 iwp->length = descr->max_tokens;
860 }
861
862 err = handler(dev, info, (union iwreq_data *) iwp, extra);
863
864 iwp->length += essid_compat;
865
866 /* If we have something to return to the user */
867 if (!err && IW_IS_GET(cmd)) {
868 /* Check if there is enough buffer up there */
869 if (user_length < iwp->length) {
870 err = -E2BIG;
871 goto out;
872 }
873
874 if (copy_to_user(iwp->pointer, extra,
875 iwp->length *
876 descr->token_size)) {
877 err = -EFAULT;
878 goto out;
879 }
880 }
881
882 /* Generate an event to notify listeners of the change */
883 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
884 ((err == 0) || (err == -EIWCOMMIT))) {
885 union iwreq_data *data = (union iwreq_data *) iwp;
886
887 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
888 /* If the event is restricted, don't
889 * export the payload.
890 */
891 wireless_send_event(dev, cmd, data, NULL);
892 else
893 wireless_send_event(dev, cmd, data, extra);
894 }
895
896out:
897 kfree(extra);
898 return err;
899}
900
901/*
902 * Call the commit handler in the driver
903 * (if exist and if conditions are right)
904 *
905 * Note : our current commit strategy is currently pretty dumb,
906 * but we will be able to improve on that...
907 * The goal is to try to agreagate as many changes as possible
908 * before doing the commit. Drivers that will define a commit handler
909 * are usually those that need a reset after changing parameters, so
910 * we want to minimise the number of reset.
911 * A cool idea is to use a timer : at each "set" command, we re-set the
912 * timer, when the timer eventually fires, we call the driver.
913 * Hopefully, more on that later.
914 *
915 * Also, I'm waiting to see how many people will complain about the
916 * netif_running(dev) test. I'm open on that one...
917 * Hopefully, the driver will remember to do a commit in "open()" ;-)
918 */
919int call_commit_handler(struct net_device *dev)
920{
921#ifdef CONFIG_WIRELESS_EXT
922 if (netif_running(dev) &&
923 dev->wireless_handlers &&
924 dev->wireless_handlers->standard[0])
925 /* Call the commit handler on the driver */
926 return dev->wireless_handlers->standard[0](dev, NULL,
927 NULL, NULL);
928 else
929 return 0; /* Command completed successfully */
930#else
931 /* cfg80211 has no commit */
932 return 0;
933#endif
934}
935
936/*
937 * Main IOCTl dispatcher.
938 * Check the type of IOCTL and call the appropriate wrapper...
939 */
940static int wireless_process_ioctl(struct net *net, struct iwreq *iwr,
941 unsigned int cmd,
942 struct iw_request_info *info,
943 wext_ioctl_func standard,
944 wext_ioctl_func private)
945{
946 struct net_device *dev;
947 iw_handler handler;
948
949 /* Permissions are already checked in dev_ioctl() before calling us.
950 * The copy_to/from_user() of ifr is also dealt with in there */
951
952 /* Make sure the device exist */
953 if ((dev = __dev_get_by_name(net, iwr->ifr_name)) == NULL)
954 return -ENODEV;
955
956 /* A bunch of special cases, then the generic case...
957 * Note that 'cmd' is already filtered in dev_ioctl() with
958 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
959 if (cmd == SIOCGIWSTATS)
960 return standard(dev, iwr, cmd, info,
961 &iw_handler_get_iwstats);
962
963#ifdef CONFIG_WEXT_PRIV
964 if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
965 return standard(dev, iwr, cmd, info,
966 iw_handler_get_private);
967#endif
968
969 /* Basic check */
970 if (!netif_device_present(dev))
971 return -ENODEV;
972
973 /* New driver API : try to find the handler */
974 handler = get_handler(dev, cmd);
975 if (handler) {
976 /* Standard and private are not the same */
977 if (cmd < SIOCIWFIRSTPRIV)
978 return standard(dev, iwr, cmd, info, handler);
979 else if (private)
980 return private(dev, iwr, cmd, info, handler);
981 }
982 return -EOPNOTSUPP;
983}
984
985/* If command is `set a parameter', or `get the encoding parameters',
986 * check if the user has the right to do it.
987 */
988static int wext_permission_check(unsigned int cmd)
989{
990 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
991 cmd == SIOCGIWENCODEEXT) &&
992 !capable(CAP_NET_ADMIN))
993 return -EPERM;
994
995 return 0;
996}
997
998/* entry point from dev ioctl */
999static int wext_ioctl_dispatch(struct net *net, struct iwreq *iwr,
1000 unsigned int cmd, struct iw_request_info *info,
1001 wext_ioctl_func standard,
1002 wext_ioctl_func private)
1003{
1004 int ret = wext_permission_check(cmd);
1005
1006 if (ret)
1007 return ret;
1008
1009 dev_load(net, iwr->ifr_name);
1010 rtnl_lock();
1011 ret = wireless_process_ioctl(net, iwr, cmd, info, standard, private);
1012 rtnl_unlock();
1013
1014 return ret;
1015}
1016
1017/*
1018 * Wrapper to call a standard Wireless Extension handler.
1019 * We do various checks and also take care of moving data between
1020 * user space and kernel space.
1021 */
1022static int ioctl_standard_call(struct net_device * dev,
1023 struct iwreq *iwr,
1024 unsigned int cmd,
1025 struct iw_request_info *info,
1026 iw_handler handler)
1027{
1028 const struct iw_ioctl_description * descr;
1029 int ret = -EINVAL;
1030
1031 /* Get the description of the IOCTL */
1032 if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
1033 return -EOPNOTSUPP;
1034 descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
1035
1036 /* Check if we have a pointer to user space data or not */
1037 if (descr->header_type != IW_HEADER_TYPE_POINT) {
1038
1039 /* No extra arguments. Trivial to handle */
1040 ret = handler(dev, info, &(iwr->u), NULL);
1041
1042 /* Generate an event to notify listeners of the change */
1043 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
1044 ((ret == 0) || (ret == -EIWCOMMIT)))
1045 wireless_send_event(dev, cmd, &(iwr->u), NULL);
1046 } else {
1047 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
1048 handler, dev, info);
1049 }
1050
1051 /* Call commit handler if needed and defined */
1052 if (ret == -EIWCOMMIT)
1053 ret = call_commit_handler(dev);
1054
1055 /* Here, we will generate the appropriate event if needed */
1056
1057 return ret;
1058}
1059
1060
1061int wext_handle_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1062{
1063 struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1064 struct iwreq iwr;
1065 int ret;
1066
1067 if (copy_from_user(&iwr, arg, sizeof(iwr)))
1068 return -EFAULT;
1069
1070 iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0;
1071
1072 ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1073 ioctl_standard_call,
1074 ioctl_private_call);
1075 if (ret >= 0 &&
1076 IW_IS_GET(cmd) &&
1077 copy_to_user(arg, &iwr, sizeof(struct iwreq)))
1078 return -EFAULT;
1079
1080 return ret;
1081}
1082
1083#ifdef CONFIG_COMPAT
1084static int compat_standard_call(struct net_device *dev,
1085 struct iwreq *iwr,
1086 unsigned int cmd,
1087 struct iw_request_info *info,
1088 iw_handler handler)
1089{
1090 const struct iw_ioctl_description *descr;
1091 struct compat_iw_point *iwp_compat;
1092 struct iw_point iwp;
1093 int err;
1094
1095 descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1096
1097 if (descr->header_type != IW_HEADER_TYPE_POINT)
1098 return ioctl_standard_call(dev, iwr, cmd, info, handler);
1099
1100 iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1101
1102 /* struct iw_point has a 32bit hole on 64bit arches. */
1103 memset(&iwp, 0, sizeof(iwp));
1104
1105 iwp.pointer = compat_ptr(iwp_compat->pointer);
1106 iwp.length = iwp_compat->length;
1107 iwp.flags = iwp_compat->flags;
1108
1109 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1110
1111 iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1112 iwp_compat->length = iwp.length;
1113 iwp_compat->flags = iwp.flags;
1114
1115 return err;
1116}
1117
1118int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1119 unsigned long arg)
1120{
1121 void __user *argp = (void __user *)arg;
1122 struct iw_request_info info;
1123 struct iwreq iwr;
1124 char *colon;
1125 int ret;
1126
1127 if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1128 return -EFAULT;
1129
1130 iwr.ifr_name[IFNAMSIZ-1] = 0;
1131 colon = strchr(iwr.ifr_name, ':');
1132 if (colon)
1133 *colon = 0;
1134
1135 info.cmd = cmd;
1136 info.flags = IW_REQUEST_FLAG_COMPAT;
1137
1138 ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1139 compat_standard_call,
1140 compat_private_call);
1141
1142 if (ret >= 0 &&
1143 IW_IS_GET(cmd) &&
1144 copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1145 return -EFAULT;
1146
1147 return ret;
1148}
1149#endif
1150
1151char *iwe_stream_add_event(struct iw_request_info *info, char *stream,
1152 char *ends, struct iw_event *iwe, int event_len)
1153{
1154 int lcp_len = iwe_stream_lcp_len(info);
1155
1156 event_len = iwe_stream_event_len_adjust(info, event_len);
1157
1158 /* Check if it's possible */
1159 if (likely((stream + event_len) < ends)) {
1160 iwe->len = event_len;
1161 /* Beware of alignment issues on 64 bits */
1162 memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1163 memcpy(stream + lcp_len, &iwe->u,
1164 event_len - lcp_len);
1165 stream += event_len;
1166 }
1167
1168 return stream;
1169}
1170EXPORT_SYMBOL(iwe_stream_add_event);
1171
1172char *iwe_stream_add_point(struct iw_request_info *info, char *stream,
1173 char *ends, struct iw_event *iwe, char *extra)
1174{
1175 int event_len = iwe_stream_point_len(info) + iwe->u.data.length;
1176 int point_len = iwe_stream_point_len(info);
1177 int lcp_len = iwe_stream_lcp_len(info);
1178
1179 /* Check if it's possible */
1180 if (likely((stream + event_len) < ends)) {
1181 iwe->len = event_len;
1182 memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1183 memcpy(stream + lcp_len,
1184 ((char *) &iwe->u) + IW_EV_POINT_OFF,
1185 IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN);
1186 if (iwe->u.data.length && extra)
1187 memcpy(stream + point_len, extra, iwe->u.data.length);
1188 stream += event_len;
1189 }
1190
1191 return stream;
1192}
1193EXPORT_SYMBOL(iwe_stream_add_point);
1194
1195char *iwe_stream_add_value(struct iw_request_info *info, char *event,
1196 char *value, char *ends, struct iw_event *iwe,
1197 int event_len)
1198{
1199 int lcp_len = iwe_stream_lcp_len(info);
1200
1201 /* Don't duplicate LCP */
1202 event_len -= IW_EV_LCP_LEN;
1203
1204 /* Check if it's possible */
1205 if (likely((value + event_len) < ends)) {
1206 /* Add new value */
1207 memcpy(value, &iwe->u, event_len);
1208 value += event_len;
1209 /* Patch LCP */
1210 iwe->len = value - event;
1211 memcpy(event, (char *) iwe, lcp_len);
1212 }
1213
1214 return value;
1215}
1216EXPORT_SYMBOL(iwe_stream_add_value);