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