xref: /openbmc/linux/net/wireless/wext-core.c (revision 6956ba7d)
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 
24 typedef 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  */
33 static 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 };
260 static 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  */
266 static 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 };
310 static const unsigned int standard_event_num = ARRAY_SIZE(standard_event);
311 
312 /* Size (in bytes) of various events */
313 static 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
328 static 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 
wireless_nlevent_flush(void)346 void 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 }
359 EXPORT_SYMBOL_GPL(wireless_nlevent_flush);
360 
wext_netdev_notifier_call(struct notifier_block * nb,unsigned long state,void * ptr)361 static 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 
376 static struct notifier_block wext_netdev_notifier = {
377 	.notifier_call = wext_netdev_notifier_call,
378 };
379 
wext_pernet_init(struct net * net)380 static int __net_init wext_pernet_init(struct net *net)
381 {
382 	skb_queue_head_init(&net->wext_nlevents);
383 	return 0;
384 }
385 
wext_pernet_exit(struct net * net)386 static void __net_exit wext_pernet_exit(struct net *net)
387 {
388 	skb_queue_purge(&net->wext_nlevents);
389 }
390 
391 static struct pernet_operations wext_pernet_ops = {
392 	.init = wext_pernet_init,
393 	.exit = wext_pernet_exit,
394 };
395 
wireless_nlevent_init(void)396 static 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 
409 subsys_initcall(wireless_nlevent_init);
410 
411 /* Process events generated by the wireless layer or the driver. */
wireless_nlevent_process(struct work_struct * work)412 static void wireless_nlevent_process(struct work_struct *work)
413 {
414 	wireless_nlevent_flush();
415 }
416 
417 static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
418 
rtnetlink_ifinfo_prep(struct net_device * dev,struct sk_buff * skb)419 static 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  */
wireless_send_event(struct net_device * dev,unsigned int cmd,union iwreq_data * wrqu,const char * extra)452 void 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 }
638 EXPORT_SYMBOL(wireless_send_event);
639 
640 #ifdef CONFIG_CFG80211_WEXT
wireless_warn_cfg80211_wext(void)641 static 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 
get_wireless_stats(struct net_device * dev)652 struct 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 */
iw_handler_get_iwstats(struct net_device * dev,struct iw_request_info * info,union iwreq_data * wrqu,char * extra)678 static 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 
get_handler(struct net_device * dev,unsigned int cmd)700 static 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 
ioctl_standard_iw_point(struct iw_point * iwp,unsigned int cmd,const struct iw_ioctl_description * descr,iw_handler handler,struct net_device * dev,struct iw_request_info * info)739 static 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 
901 out:
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  */
call_commit_handler(struct net_device * dev)924 int 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  */
wireless_process_ioctl(struct net * net,struct iwreq * iwr,unsigned int cmd,struct iw_request_info * info,wext_ioctl_func standard,wext_ioctl_func private)945 static 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  */
wext_permission_check(unsigned int cmd)993 static 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 */
wext_ioctl_dispatch(struct net * net,struct iwreq * iwr,unsigned int cmd,struct iw_request_info * info,wext_ioctl_func standard,wext_ioctl_func private)1004 static 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  */
ioctl_standard_call(struct net_device * dev,struct iwreq * iwr,unsigned int cmd,struct iw_request_info * info,iw_handler handler)1027 static 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 
wext_handle_ioctl(struct net * net,unsigned int cmd,void __user * arg)1066 int 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
compat_standard_call(struct net_device * dev,struct iwreq * iwr,unsigned int cmd,struct iw_request_info * info,iw_handler handler)1089 static 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 
compat_wext_handle_ioctl(struct net * net,unsigned int cmd,unsigned long arg)1119 int 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 
iwe_stream_add_event(struct iw_request_info * info,char * stream,char * ends,struct iw_event * iwe,int event_len)1152 char *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 alignement 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 }
1171 EXPORT_SYMBOL(iwe_stream_add_event);
1172 
iwe_stream_add_point(struct iw_request_info * info,char * stream,char * ends,struct iw_event * iwe,char * extra)1173 char *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 }
1194 EXPORT_SYMBOL(iwe_stream_add_point);
1195 
iwe_stream_add_value(struct iw_request_info * info,char * event,char * value,char * ends,struct iw_event * iwe,int event_len)1196 char *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 }
1217 EXPORT_SYMBOL(iwe_stream_add_value);
1218