1 /*
2 * This file implement the Wireless Extensions core API.
3 *
4 * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
5 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
6 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
7 *
8 * (As all part of the Linux kernel, this file is GPL)
9 */
10 #include <linux/kernel.h>
11 #include <linux/netdevice.h>
12 #include <linux/rtnetlink.h>
13 #include <linux/slab.h>
14 #include <linux/wireless.h>
15 #include <linux/uaccess.h>
16 #include <linux/export.h>
17 #include <net/cfg80211.h>
18 #include <net/iw_handler.h>
19 #include <net/netlink.h>
20 #include <net/wext.h>
21 #include <net/net_namespace.h>
22
23 typedef int (*wext_ioctl_func)(struct net_device *, struct iwreq *,
24 unsigned int, struct iw_request_info *,
25 iw_handler);
26
27
28 /*
29 * Meta-data about all the standard Wireless Extension request we
30 * know about.
31 */
32 static const struct iw_ioctl_description standard_ioctl[] = {
33 [IW_IOCTL_IDX(SIOCSIWCOMMIT)] = {
34 .header_type = IW_HEADER_TYPE_NULL,
35 },
36 [IW_IOCTL_IDX(SIOCGIWNAME)] = {
37 .header_type = IW_HEADER_TYPE_CHAR,
38 .flags = IW_DESCR_FLAG_DUMP,
39 },
40 [IW_IOCTL_IDX(SIOCSIWNWID)] = {
41 .header_type = IW_HEADER_TYPE_PARAM,
42 .flags = IW_DESCR_FLAG_EVENT,
43 },
44 [IW_IOCTL_IDX(SIOCGIWNWID)] = {
45 .header_type = IW_HEADER_TYPE_PARAM,
46 .flags = IW_DESCR_FLAG_DUMP,
47 },
48 [IW_IOCTL_IDX(SIOCSIWFREQ)] = {
49 .header_type = IW_HEADER_TYPE_FREQ,
50 .flags = IW_DESCR_FLAG_EVENT,
51 },
52 [IW_IOCTL_IDX(SIOCGIWFREQ)] = {
53 .header_type = IW_HEADER_TYPE_FREQ,
54 .flags = IW_DESCR_FLAG_DUMP,
55 },
56 [IW_IOCTL_IDX(SIOCSIWMODE)] = {
57 .header_type = IW_HEADER_TYPE_UINT,
58 .flags = IW_DESCR_FLAG_EVENT,
59 },
60 [IW_IOCTL_IDX(SIOCGIWMODE)] = {
61 .header_type = IW_HEADER_TYPE_UINT,
62 .flags = IW_DESCR_FLAG_DUMP,
63 },
64 [IW_IOCTL_IDX(SIOCSIWSENS)] = {
65 .header_type = IW_HEADER_TYPE_PARAM,
66 },
67 [IW_IOCTL_IDX(SIOCGIWSENS)] = {
68 .header_type = IW_HEADER_TYPE_PARAM,
69 },
70 [IW_IOCTL_IDX(SIOCSIWRANGE)] = {
71 .header_type = IW_HEADER_TYPE_NULL,
72 },
73 [IW_IOCTL_IDX(SIOCGIWRANGE)] = {
74 .header_type = IW_HEADER_TYPE_POINT,
75 .token_size = 1,
76 .max_tokens = sizeof(struct iw_range),
77 .flags = IW_DESCR_FLAG_DUMP,
78 },
79 [IW_IOCTL_IDX(SIOCSIWPRIV)] = {
80 .header_type = IW_HEADER_TYPE_NULL,
81 },
82 [IW_IOCTL_IDX(SIOCGIWPRIV)] = { /* (handled directly by us) */
83 .header_type = IW_HEADER_TYPE_POINT,
84 .token_size = sizeof(struct iw_priv_args),
85 .max_tokens = 16,
86 .flags = IW_DESCR_FLAG_NOMAX,
87 },
88 [IW_IOCTL_IDX(SIOCSIWSTATS)] = {
89 .header_type = IW_HEADER_TYPE_NULL,
90 },
91 [IW_IOCTL_IDX(SIOCGIWSTATS)] = { /* (handled directly by us) */
92 .header_type = IW_HEADER_TYPE_POINT,
93 .token_size = 1,
94 .max_tokens = sizeof(struct iw_statistics),
95 .flags = IW_DESCR_FLAG_DUMP,
96 },
97 [IW_IOCTL_IDX(SIOCSIWSPY)] = {
98 .header_type = IW_HEADER_TYPE_POINT,
99 .token_size = sizeof(struct sockaddr),
100 .max_tokens = IW_MAX_SPY,
101 },
102 [IW_IOCTL_IDX(SIOCGIWSPY)] = {
103 .header_type = IW_HEADER_TYPE_POINT,
104 .token_size = sizeof(struct sockaddr) +
105 sizeof(struct iw_quality),
106 .max_tokens = IW_MAX_SPY,
107 },
108 [IW_IOCTL_IDX(SIOCSIWTHRSPY)] = {
109 .header_type = IW_HEADER_TYPE_POINT,
110 .token_size = sizeof(struct iw_thrspy),
111 .min_tokens = 1,
112 .max_tokens = 1,
113 },
114 [IW_IOCTL_IDX(SIOCGIWTHRSPY)] = {
115 .header_type = IW_HEADER_TYPE_POINT,
116 .token_size = sizeof(struct iw_thrspy),
117 .min_tokens = 1,
118 .max_tokens = 1,
119 },
120 [IW_IOCTL_IDX(SIOCSIWAP)] = {
121 .header_type = IW_HEADER_TYPE_ADDR,
122 },
123 [IW_IOCTL_IDX(SIOCGIWAP)] = {
124 .header_type = IW_HEADER_TYPE_ADDR,
125 .flags = IW_DESCR_FLAG_DUMP,
126 },
127 [IW_IOCTL_IDX(SIOCSIWMLME)] = {
128 .header_type = IW_HEADER_TYPE_POINT,
129 .token_size = 1,
130 .min_tokens = sizeof(struct iw_mlme),
131 .max_tokens = sizeof(struct iw_mlme),
132 },
133 [IW_IOCTL_IDX(SIOCGIWAPLIST)] = {
134 .header_type = IW_HEADER_TYPE_POINT,
135 .token_size = sizeof(struct sockaddr) +
136 sizeof(struct iw_quality),
137 .max_tokens = IW_MAX_AP,
138 .flags = IW_DESCR_FLAG_NOMAX,
139 },
140 [IW_IOCTL_IDX(SIOCSIWSCAN)] = {
141 .header_type = IW_HEADER_TYPE_POINT,
142 .token_size = 1,
143 .min_tokens = 0,
144 .max_tokens = sizeof(struct iw_scan_req),
145 },
146 [IW_IOCTL_IDX(SIOCGIWSCAN)] = {
147 .header_type = IW_HEADER_TYPE_POINT,
148 .token_size = 1,
149 .max_tokens = IW_SCAN_MAX_DATA,
150 .flags = IW_DESCR_FLAG_NOMAX,
151 },
152 [IW_IOCTL_IDX(SIOCSIWESSID)] = {
153 .header_type = IW_HEADER_TYPE_POINT,
154 .token_size = 1,
155 .max_tokens = IW_ESSID_MAX_SIZE,
156 .flags = IW_DESCR_FLAG_EVENT,
157 },
158 [IW_IOCTL_IDX(SIOCGIWESSID)] = {
159 .header_type = IW_HEADER_TYPE_POINT,
160 .token_size = 1,
161 .max_tokens = IW_ESSID_MAX_SIZE,
162 .flags = IW_DESCR_FLAG_DUMP,
163 },
164 [IW_IOCTL_IDX(SIOCSIWNICKN)] = {
165 .header_type = IW_HEADER_TYPE_POINT,
166 .token_size = 1,
167 .max_tokens = IW_ESSID_MAX_SIZE,
168 },
169 [IW_IOCTL_IDX(SIOCGIWNICKN)] = {
170 .header_type = IW_HEADER_TYPE_POINT,
171 .token_size = 1,
172 .max_tokens = IW_ESSID_MAX_SIZE,
173 },
174 [IW_IOCTL_IDX(SIOCSIWRATE)] = {
175 .header_type = IW_HEADER_TYPE_PARAM,
176 },
177 [IW_IOCTL_IDX(SIOCGIWRATE)] = {
178 .header_type = IW_HEADER_TYPE_PARAM,
179 },
180 [IW_IOCTL_IDX(SIOCSIWRTS)] = {
181 .header_type = IW_HEADER_TYPE_PARAM,
182 },
183 [IW_IOCTL_IDX(SIOCGIWRTS)] = {
184 .header_type = IW_HEADER_TYPE_PARAM,
185 },
186 [IW_IOCTL_IDX(SIOCSIWFRAG)] = {
187 .header_type = IW_HEADER_TYPE_PARAM,
188 },
189 [IW_IOCTL_IDX(SIOCGIWFRAG)] = {
190 .header_type = IW_HEADER_TYPE_PARAM,
191 },
192 [IW_IOCTL_IDX(SIOCSIWTXPOW)] = {
193 .header_type = IW_HEADER_TYPE_PARAM,
194 },
195 [IW_IOCTL_IDX(SIOCGIWTXPOW)] = {
196 .header_type = IW_HEADER_TYPE_PARAM,
197 },
198 [IW_IOCTL_IDX(SIOCSIWRETRY)] = {
199 .header_type = IW_HEADER_TYPE_PARAM,
200 },
201 [IW_IOCTL_IDX(SIOCGIWRETRY)] = {
202 .header_type = IW_HEADER_TYPE_PARAM,
203 },
204 [IW_IOCTL_IDX(SIOCSIWENCODE)] = {
205 .header_type = IW_HEADER_TYPE_POINT,
206 .token_size = 1,
207 .max_tokens = IW_ENCODING_TOKEN_MAX,
208 .flags = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
209 },
210 [IW_IOCTL_IDX(SIOCGIWENCODE)] = {
211 .header_type = IW_HEADER_TYPE_POINT,
212 .token_size = 1,
213 .max_tokens = IW_ENCODING_TOKEN_MAX,
214 .flags = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
215 },
216 [IW_IOCTL_IDX(SIOCSIWPOWER)] = {
217 .header_type = IW_HEADER_TYPE_PARAM,
218 },
219 [IW_IOCTL_IDX(SIOCGIWPOWER)] = {
220 .header_type = IW_HEADER_TYPE_PARAM,
221 },
222 [IW_IOCTL_IDX(SIOCSIWGENIE)] = {
223 .header_type = IW_HEADER_TYPE_POINT,
224 .token_size = 1,
225 .max_tokens = IW_GENERIC_IE_MAX,
226 },
227 [IW_IOCTL_IDX(SIOCGIWGENIE)] = {
228 .header_type = IW_HEADER_TYPE_POINT,
229 .token_size = 1,
230 .max_tokens = IW_GENERIC_IE_MAX,
231 },
232 [IW_IOCTL_IDX(SIOCSIWAUTH)] = {
233 .header_type = IW_HEADER_TYPE_PARAM,
234 },
235 [IW_IOCTL_IDX(SIOCGIWAUTH)] = {
236 .header_type = IW_HEADER_TYPE_PARAM,
237 },
238 [IW_IOCTL_IDX(SIOCSIWENCODEEXT)] = {
239 .header_type = IW_HEADER_TYPE_POINT,
240 .token_size = 1,
241 .min_tokens = sizeof(struct iw_encode_ext),
242 .max_tokens = sizeof(struct iw_encode_ext) +
243 IW_ENCODING_TOKEN_MAX,
244 },
245 [IW_IOCTL_IDX(SIOCGIWENCODEEXT)] = {
246 .header_type = IW_HEADER_TYPE_POINT,
247 .token_size = 1,
248 .min_tokens = sizeof(struct iw_encode_ext),
249 .max_tokens = sizeof(struct iw_encode_ext) +
250 IW_ENCODING_TOKEN_MAX,
251 },
252 [IW_IOCTL_IDX(SIOCSIWPMKSA)] = {
253 .header_type = IW_HEADER_TYPE_POINT,
254 .token_size = 1,
255 .min_tokens = sizeof(struct iw_pmksa),
256 .max_tokens = sizeof(struct iw_pmksa),
257 },
258 };
259 static const unsigned int standard_ioctl_num = ARRAY_SIZE(standard_ioctl);
260
261 /*
262 * Meta-data about all the additional standard Wireless Extension events
263 * we know about.
264 */
265 static const struct iw_ioctl_description standard_event[] = {
266 [IW_EVENT_IDX(IWEVTXDROP)] = {
267 .header_type = IW_HEADER_TYPE_ADDR,
268 },
269 [IW_EVENT_IDX(IWEVQUAL)] = {
270 .header_type = IW_HEADER_TYPE_QUAL,
271 },
272 [IW_EVENT_IDX(IWEVCUSTOM)] = {
273 .header_type = IW_HEADER_TYPE_POINT,
274 .token_size = 1,
275 .max_tokens = IW_CUSTOM_MAX,
276 },
277 [IW_EVENT_IDX(IWEVREGISTERED)] = {
278 .header_type = IW_HEADER_TYPE_ADDR,
279 },
280 [IW_EVENT_IDX(IWEVEXPIRED)] = {
281 .header_type = IW_HEADER_TYPE_ADDR,
282 },
283 [IW_EVENT_IDX(IWEVGENIE)] = {
284 .header_type = IW_HEADER_TYPE_POINT,
285 .token_size = 1,
286 .max_tokens = IW_GENERIC_IE_MAX,
287 },
288 [IW_EVENT_IDX(IWEVMICHAELMICFAILURE)] = {
289 .header_type = IW_HEADER_TYPE_POINT,
290 .token_size = 1,
291 .max_tokens = sizeof(struct iw_michaelmicfailure),
292 },
293 [IW_EVENT_IDX(IWEVASSOCREQIE)] = {
294 .header_type = IW_HEADER_TYPE_POINT,
295 .token_size = 1,
296 .max_tokens = IW_GENERIC_IE_MAX,
297 },
298 [IW_EVENT_IDX(IWEVASSOCRESPIE)] = {
299 .header_type = IW_HEADER_TYPE_POINT,
300 .token_size = 1,
301 .max_tokens = IW_GENERIC_IE_MAX,
302 },
303 [IW_EVENT_IDX(IWEVPMKIDCAND)] = {
304 .header_type = IW_HEADER_TYPE_POINT,
305 .token_size = 1,
306 .max_tokens = sizeof(struct iw_pmkid_cand),
307 },
308 };
309 static const unsigned int standard_event_num = ARRAY_SIZE(standard_event);
310
311 /* Size (in bytes) of various events */
312 static const int event_type_size[] = {
313 IW_EV_LCP_LEN, /* IW_HEADER_TYPE_NULL */
314 0,
315 IW_EV_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
316 0,
317 IW_EV_UINT_LEN, /* IW_HEADER_TYPE_UINT */
318 IW_EV_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
319 IW_EV_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
320 0,
321 IW_EV_POINT_LEN, /* Without variable payload */
322 IW_EV_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
323 IW_EV_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
324 };
325
326 #ifdef CONFIG_COMPAT
327 static const int compat_event_type_size[] = {
328 IW_EV_COMPAT_LCP_LEN, /* IW_HEADER_TYPE_NULL */
329 0,
330 IW_EV_COMPAT_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
331 0,
332 IW_EV_COMPAT_UINT_LEN, /* IW_HEADER_TYPE_UINT */
333 IW_EV_COMPAT_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
334 IW_EV_COMPAT_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
335 0,
336 IW_EV_COMPAT_POINT_LEN, /* Without variable payload */
337 IW_EV_COMPAT_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
338 IW_EV_COMPAT_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
339 };
340 #endif
341
342
343 /* IW event code */
344
wireless_nlevent_flush(void)345 void 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 }
358 EXPORT_SYMBOL_GPL(wireless_nlevent_flush);
359
wext_netdev_notifier_call(struct notifier_block * nb,unsigned long state,void * ptr)360 static int wext_netdev_notifier_call(struct notifier_block *nb,
361 unsigned long state, void *ptr)
362 {
363 /*
364 * When a netdev changes state in any way, flush all pending messages
365 * to avoid them going out in a strange order, e.g. RTM_NEWLINK after
366 * RTM_DELLINK, or with IFF_UP after without IFF_UP during dev_close()
367 * or similar - all of which could otherwise happen due to delays from
368 * schedule_work().
369 */
370 wireless_nlevent_flush();
371
372 return NOTIFY_OK;
373 }
374
375 static struct notifier_block wext_netdev_notifier = {
376 .notifier_call = wext_netdev_notifier_call,
377 };
378
wext_pernet_init(struct net * net)379 static int __net_init wext_pernet_init(struct net *net)
380 {
381 skb_queue_head_init(&net->wext_nlevents);
382 return 0;
383 }
384
wext_pernet_exit(struct net * net)385 static void __net_exit wext_pernet_exit(struct net *net)
386 {
387 skb_queue_purge(&net->wext_nlevents);
388 }
389
390 static struct pernet_operations wext_pernet_ops = {
391 .init = wext_pernet_init,
392 .exit = wext_pernet_exit,
393 };
394
wireless_nlevent_init(void)395 static int __init wireless_nlevent_init(void)
396 {
397 int err = register_pernet_subsys(&wext_pernet_ops);
398
399 if (err)
400 return err;
401
402 err = register_netdevice_notifier(&wext_netdev_notifier);
403 if (err)
404 unregister_pernet_subsys(&wext_pernet_ops);
405 return err;
406 }
407
408 subsys_initcall(wireless_nlevent_init);
409
410 /* Process events generated by the wireless layer or the driver. */
wireless_nlevent_process(struct work_struct * work)411 static void wireless_nlevent_process(struct work_struct *work)
412 {
413 wireless_nlevent_flush();
414 }
415
416 static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
417
rtnetlink_ifinfo_prep(struct net_device * dev,struct sk_buff * skb)418 static 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 = dev_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 */
wireless_send_event(struct net_device * dev,unsigned int cmd,union iwreq_data * wrqu,const char * extra)451 void 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 #endif
472
473 /*
474 * Nothing in the kernel sends scan events with data, be safe.
475 * This is necessary because we cannot fix up scan event data
476 * for compat, due to being contained in 'extra', but normally
477 * applications are required to retrieve the scan data anyway
478 * and no data is included in the event, this codifies that
479 * practice.
480 */
481 if (WARN_ON(cmd == SIOCGIWSCAN && extra))
482 extra = NULL;
483
484 /* Get the description of the Event */
485 if (cmd <= SIOCIWLAST) {
486 cmd_index = IW_IOCTL_IDX(cmd);
487 if (cmd_index < standard_ioctl_num)
488 descr = &(standard_ioctl[cmd_index]);
489 } else {
490 cmd_index = IW_EVENT_IDX(cmd);
491 if (cmd_index < standard_event_num)
492 descr = &(standard_event[cmd_index]);
493 }
494 /* Don't accept unknown events */
495 if (descr == NULL) {
496 /* Note : we don't return an error to the driver, because
497 * the driver would not know what to do about it. It can't
498 * return an error to the user, because the event is not
499 * initiated by a user request.
500 * The best the driver could do is to log an error message.
501 * We will do it ourselves instead...
502 */
503 netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
504 cmd);
505 return;
506 }
507
508 /* Check extra parameters and set extra_len */
509 if (descr->header_type == IW_HEADER_TYPE_POINT) {
510 /* Check if number of token fits within bounds */
511 if (wrqu->data.length > descr->max_tokens) {
512 netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too big (%d)\n",
513 cmd, wrqu->data.length);
514 return;
515 }
516 if (wrqu->data.length < descr->min_tokens) {
517 netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too small (%d)\n",
518 cmd, wrqu->data.length);
519 return;
520 }
521 /* Calculate extra_len - extra is NULL for restricted events */
522 if (extra != NULL)
523 extra_len = wrqu->data.length * descr->token_size;
524 /* Always at an offset in wrqu */
525 wrqu_off = IW_EV_POINT_OFF;
526 }
527
528 /* Total length of the event */
529 hdr_len = event_type_size[descr->header_type];
530 event_len = hdr_len + extra_len;
531
532 /*
533 * The problem for 64/32 bit.
534 *
535 * On 64-bit, a regular event is laid out as follows:
536 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
537 * | event.len | event.cmd | p a d d i n g |
538 * | wrqu data ... (with the correct size) |
539 *
540 * This padding exists because we manipulate event->u,
541 * and 'event' is not packed.
542 *
543 * An iw_point event is laid out like this instead:
544 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
545 * | event.len | event.cmd | p a d d i n g |
546 * | iwpnt.len | iwpnt.flg | p a d d i n g |
547 * | extra data ...
548 *
549 * The second padding exists because struct iw_point is extended,
550 * but this depends on the platform...
551 *
552 * On 32-bit, all the padding shouldn't be there.
553 */
554
555 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
556 if (!skb)
557 return;
558
559 /* Send via the RtNetlink event channel */
560 nlh = rtnetlink_ifinfo_prep(dev, skb);
561 if (WARN_ON(!nlh)) {
562 kfree_skb(skb);
563 return;
564 }
565
566 /* Add the wireless events in the netlink packet */
567 nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
568 if (!nla) {
569 kfree_skb(skb);
570 return;
571 }
572 event = nla_data(nla);
573
574 /* Fill event - first clear to avoid data leaking */
575 memset(event, 0, hdr_len);
576 event->len = event_len;
577 event->cmd = cmd;
578 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
579 if (extra_len)
580 memcpy(((char *) event) + hdr_len, extra, extra_len);
581
582 nlmsg_end(skb, nlh);
583 #ifdef CONFIG_COMPAT
584 hdr_len = compat_event_type_size[descr->header_type];
585 event_len = hdr_len + extra_len;
586
587 compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
588 if (!compskb) {
589 kfree_skb(skb);
590 return;
591 }
592
593 /* Send via the RtNetlink event channel */
594 nlh = rtnetlink_ifinfo_prep(dev, compskb);
595 if (WARN_ON(!nlh)) {
596 kfree_skb(skb);
597 kfree_skb(compskb);
598 return;
599 }
600
601 /* Add the wireless events in the netlink packet */
602 nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
603 if (!nla) {
604 kfree_skb(skb);
605 kfree_skb(compskb);
606 return;
607 }
608 compat_event = nla_data(nla);
609
610 compat_event->len = event_len;
611 compat_event->cmd = cmd;
612 if (descr->header_type == IW_HEADER_TYPE_POINT) {
613 compat_wrqu.length = wrqu->data.length;
614 compat_wrqu.flags = wrqu->data.flags;
615 memcpy(&compat_event->pointer,
616 ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
617 hdr_len - IW_EV_COMPAT_LCP_LEN);
618 if (extra_len)
619 memcpy(((char *) compat_event) + hdr_len,
620 extra, extra_len);
621 } else {
622 /* extra_len must be zero, so no if (extra) needed */
623 memcpy(&compat_event->pointer, wrqu,
624 hdr_len - IW_EV_COMPAT_LCP_LEN);
625 }
626
627 nlmsg_end(compskb, nlh);
628
629 skb_shinfo(skb)->frag_list = compskb;
630 #endif
631 skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
632 schedule_work(&wireless_nlevent_work);
633 }
634 EXPORT_SYMBOL(wireless_send_event);
635
636
637
638 /* IW handlers */
639
get_wireless_stats(struct net_device * dev)640 struct iw_statistics *get_wireless_stats(struct net_device *dev)
641 {
642 #ifdef CONFIG_WIRELESS_EXT
643 if ((dev->wireless_handlers != NULL) &&
644 (dev->wireless_handlers->get_wireless_stats != NULL))
645 return dev->wireless_handlers->get_wireless_stats(dev);
646 #endif
647
648 #ifdef CONFIG_CFG80211_WEXT
649 if (dev->ieee80211_ptr &&
650 dev->ieee80211_ptr->wiphy &&
651 dev->ieee80211_ptr->wiphy->wext &&
652 dev->ieee80211_ptr->wiphy->wext->get_wireless_stats)
653 return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
654 #endif
655
656 /* not found */
657 return NULL;
658 }
659
660 /* 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)661 static noinline int iw_handler_get_iwstats(struct net_device * dev,
662 struct iw_request_info * info,
663 union iwreq_data * wrqu,
664 char * extra)
665 {
666 /* Get stats from the driver */
667 struct iw_statistics *stats;
668
669 stats = get_wireless_stats(dev);
670 if (stats) {
671 /* Copy statistics to extra */
672 memcpy(extra, stats, sizeof(struct iw_statistics));
673 wrqu->data.length = sizeof(struct iw_statistics);
674
675 /* Check if we need to clear the updated flag */
676 if (wrqu->data.flags != 0)
677 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
678 return 0;
679 } else
680 return -EOPNOTSUPP;
681 }
682
get_handler(struct net_device * dev,unsigned int cmd)683 static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
684 {
685 /* Don't "optimise" the following variable, it will crash */
686 unsigned int index; /* *MUST* be unsigned */
687 const struct iw_handler_def *handlers = NULL;
688
689 #ifdef CONFIG_CFG80211_WEXT
690 if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
691 handlers = dev->ieee80211_ptr->wiphy->wext;
692 #endif
693 #ifdef CONFIG_WIRELESS_EXT
694 if (dev->wireless_handlers)
695 handlers = dev->wireless_handlers;
696 #endif
697
698 if (!handlers)
699 return NULL;
700
701 /* Try as a standard command */
702 index = IW_IOCTL_IDX(cmd);
703 if (index < handlers->num_standard)
704 return handlers->standard[index];
705
706 #ifdef CONFIG_WEXT_PRIV
707 /* Try as a private command */
708 index = cmd - SIOCIWFIRSTPRIV;
709 if (index < handlers->num_private)
710 return handlers->private[index];
711 #endif
712
713 /* Not found */
714 return NULL;
715 }
716
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)717 static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
718 const struct iw_ioctl_description *descr,
719 iw_handler handler, struct net_device *dev,
720 struct iw_request_info *info)
721 {
722 int err, extra_size, user_length = 0, essid_compat = 0;
723 char *extra;
724
725 /* Calculate space needed by arguments. Always allocate
726 * for max space.
727 */
728 extra_size = descr->max_tokens * descr->token_size;
729
730 /* Check need for ESSID compatibility for WE < 21 */
731 switch (cmd) {
732 case SIOCSIWESSID:
733 case SIOCGIWESSID:
734 case SIOCSIWNICKN:
735 case SIOCGIWNICKN:
736 if (iwp->length == descr->max_tokens + 1)
737 essid_compat = 1;
738 else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
739 char essid[IW_ESSID_MAX_SIZE + 1];
740 unsigned int len;
741 len = iwp->length * descr->token_size;
742
743 if (len > IW_ESSID_MAX_SIZE)
744 return -EFAULT;
745
746 err = copy_from_user(essid, iwp->pointer, len);
747 if (err)
748 return -EFAULT;
749
750 if (essid[iwp->length - 1] == '\0')
751 essid_compat = 1;
752 }
753 break;
754 default:
755 break;
756 }
757
758 iwp->length -= essid_compat;
759
760 /* Check what user space is giving us */
761 if (IW_IS_SET(cmd)) {
762 /* Check NULL pointer */
763 if (!iwp->pointer && iwp->length != 0)
764 return -EFAULT;
765 /* Check if number of token fits within bounds */
766 if (iwp->length > descr->max_tokens)
767 return -E2BIG;
768 if (iwp->length < descr->min_tokens)
769 return -EINVAL;
770 } else {
771 /* Check NULL pointer */
772 if (!iwp->pointer)
773 return -EFAULT;
774 /* Save user space buffer size for checking */
775 user_length = iwp->length;
776
777 /* Don't check if user_length > max to allow forward
778 * compatibility. The test user_length < min is
779 * implied by the test at the end.
780 */
781
782 /* Support for very large requests */
783 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
784 (user_length > descr->max_tokens)) {
785 /* Allow userspace to GET more than max so
786 * we can support any size GET requests.
787 * There is still a limit : -ENOMEM.
788 */
789 extra_size = user_length * descr->token_size;
790
791 /* Note : user_length is originally a __u16,
792 * and token_size is controlled by us,
793 * so extra_size won't get negative and
794 * won't overflow...
795 */
796 }
797 }
798
799 /* Sanity-check to ensure we never end up _allocating_ zero
800 * bytes of data for extra.
801 */
802 if (extra_size <= 0)
803 return -EFAULT;
804
805 /* kzalloc() ensures NULL-termination for essid_compat. */
806 extra = kzalloc(extra_size, GFP_KERNEL);
807 if (!extra)
808 return -ENOMEM;
809
810 /* If it is a SET, get all the extra data in here */
811 if (IW_IS_SET(cmd) && (iwp->length != 0)) {
812 if (copy_from_user(extra, iwp->pointer,
813 iwp->length *
814 descr->token_size)) {
815 err = -EFAULT;
816 goto out;
817 }
818
819 if (cmd == SIOCSIWENCODEEXT) {
820 struct iw_encode_ext *ee = (void *) extra;
821
822 if (iwp->length < sizeof(*ee) + ee->key_len) {
823 err = -EFAULT;
824 goto out;
825 }
826 }
827 }
828
829 if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
830 /*
831 * If this is a GET, but not NOMAX, it means that the extra
832 * data is not bounded by userspace, but by max_tokens. Thus
833 * set the length to max_tokens. This matches the extra data
834 * allocation.
835 * The driver should fill it with the number of tokens it
836 * provided, and it may check iwp->length rather than having
837 * knowledge of max_tokens. If the driver doesn't change the
838 * iwp->length, this ioctl just copies back max_token tokens
839 * filled with zeroes. Hopefully the driver isn't claiming
840 * them to be valid data.
841 */
842 iwp->length = descr->max_tokens;
843 }
844
845 err = handler(dev, info, (union iwreq_data *) iwp, extra);
846
847 iwp->length += essid_compat;
848
849 /* If we have something to return to the user */
850 if (!err && IW_IS_GET(cmd)) {
851 /* Check if there is enough buffer up there */
852 if (user_length < iwp->length) {
853 err = -E2BIG;
854 goto out;
855 }
856
857 if (copy_to_user(iwp->pointer, extra,
858 iwp->length *
859 descr->token_size)) {
860 err = -EFAULT;
861 goto out;
862 }
863 }
864
865 /* Generate an event to notify listeners of the change */
866 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
867 ((err == 0) || (err == -EIWCOMMIT))) {
868 union iwreq_data *data = (union iwreq_data *) iwp;
869
870 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
871 /* If the event is restricted, don't
872 * export the payload.
873 */
874 wireless_send_event(dev, cmd, data, NULL);
875 else
876 wireless_send_event(dev, cmd, data, extra);
877 }
878
879 out:
880 kfree(extra);
881 return err;
882 }
883
884 /*
885 * Call the commit handler in the driver
886 * (if exist and if conditions are right)
887 *
888 * Note : our current commit strategy is currently pretty dumb,
889 * but we will be able to improve on that...
890 * The goal is to try to agreagate as many changes as possible
891 * before doing the commit. Drivers that will define a commit handler
892 * are usually those that need a reset after changing parameters, so
893 * we want to minimise the number of reset.
894 * A cool idea is to use a timer : at each "set" command, we re-set the
895 * timer, when the timer eventually fires, we call the driver.
896 * Hopefully, more on that later.
897 *
898 * Also, I'm waiting to see how many people will complain about the
899 * netif_running(dev) test. I'm open on that one...
900 * Hopefully, the driver will remember to do a commit in "open()" ;-)
901 */
call_commit_handler(struct net_device * dev)902 int call_commit_handler(struct net_device *dev)
903 {
904 #ifdef CONFIG_WIRELESS_EXT
905 if (netif_running(dev) &&
906 dev->wireless_handlers &&
907 dev->wireless_handlers->standard[0])
908 /* Call the commit handler on the driver */
909 return dev->wireless_handlers->standard[0](dev, NULL,
910 NULL, NULL);
911 else
912 return 0; /* Command completed successfully */
913 #else
914 /* cfg80211 has no commit */
915 return 0;
916 #endif
917 }
918
919 /*
920 * Main IOCTl dispatcher.
921 * Check the type of IOCTL and call the appropriate wrapper...
922 */
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)923 static int wireless_process_ioctl(struct net *net, struct iwreq *iwr,
924 unsigned int cmd,
925 struct iw_request_info *info,
926 wext_ioctl_func standard,
927 wext_ioctl_func private)
928 {
929 struct net_device *dev;
930 iw_handler handler;
931
932 /* Permissions are already checked in dev_ioctl() before calling us.
933 * The copy_to/from_user() of ifr is also dealt with in there */
934
935 /* Make sure the device exist */
936 if ((dev = __dev_get_by_name(net, iwr->ifr_name)) == NULL)
937 return -ENODEV;
938
939 /* A bunch of special cases, then the generic case...
940 * Note that 'cmd' is already filtered in dev_ioctl() with
941 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
942 if (cmd == SIOCGIWSTATS)
943 return standard(dev, iwr, cmd, info,
944 &iw_handler_get_iwstats);
945
946 #ifdef CONFIG_WEXT_PRIV
947 if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
948 return standard(dev, iwr, cmd, info,
949 iw_handler_get_private);
950 #endif
951
952 /* Basic check */
953 if (!netif_device_present(dev))
954 return -ENODEV;
955
956 /* New driver API : try to find the handler */
957 handler = get_handler(dev, cmd);
958 if (handler) {
959 /* Standard and private are not the same */
960 if (cmd < SIOCIWFIRSTPRIV)
961 return standard(dev, iwr, cmd, info, handler);
962 else if (private)
963 return private(dev, iwr, cmd, info, handler);
964 }
965 return -EOPNOTSUPP;
966 }
967
968 /* If command is `set a parameter', or `get the encoding parameters',
969 * check if the user has the right to do it.
970 */
wext_permission_check(unsigned int cmd)971 static int wext_permission_check(unsigned int cmd)
972 {
973 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
974 cmd == SIOCGIWENCODEEXT) &&
975 !capable(CAP_NET_ADMIN))
976 return -EPERM;
977
978 return 0;
979 }
980
981 /* 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)982 static int wext_ioctl_dispatch(struct net *net, struct iwreq *iwr,
983 unsigned int cmd, struct iw_request_info *info,
984 wext_ioctl_func standard,
985 wext_ioctl_func private)
986 {
987 int ret = wext_permission_check(cmd);
988
989 if (ret)
990 return ret;
991
992 dev_load(net, iwr->ifr_name);
993 rtnl_lock();
994 ret = wireless_process_ioctl(net, iwr, cmd, info, standard, private);
995 rtnl_unlock();
996
997 return ret;
998 }
999
1000 /*
1001 * Wrapper to call a standard Wireless Extension handler.
1002 * We do various checks and also take care of moving data between
1003 * user space and kernel space.
1004 */
ioctl_standard_call(struct net_device * dev,struct iwreq * iwr,unsigned int cmd,struct iw_request_info * info,iw_handler handler)1005 static int ioctl_standard_call(struct net_device * dev,
1006 struct iwreq *iwr,
1007 unsigned int cmd,
1008 struct iw_request_info *info,
1009 iw_handler handler)
1010 {
1011 const struct iw_ioctl_description * descr;
1012 int ret = -EINVAL;
1013
1014 /* Get the description of the IOCTL */
1015 if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
1016 return -EOPNOTSUPP;
1017 descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
1018
1019 /* Check if we have a pointer to user space data or not */
1020 if (descr->header_type != IW_HEADER_TYPE_POINT) {
1021
1022 /* No extra arguments. Trivial to handle */
1023 ret = handler(dev, info, &(iwr->u), NULL);
1024
1025 /* Generate an event to notify listeners of the change */
1026 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
1027 ((ret == 0) || (ret == -EIWCOMMIT)))
1028 wireless_send_event(dev, cmd, &(iwr->u), NULL);
1029 } else {
1030 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
1031 handler, dev, info);
1032 }
1033
1034 /* Call commit handler if needed and defined */
1035 if (ret == -EIWCOMMIT)
1036 ret = call_commit_handler(dev);
1037
1038 /* Here, we will generate the appropriate event if needed */
1039
1040 return ret;
1041 }
1042
1043
wext_handle_ioctl(struct net * net,unsigned int cmd,void __user * arg)1044 int wext_handle_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1045 {
1046 struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1047 struct iwreq iwr;
1048 int ret;
1049
1050 if (copy_from_user(&iwr, arg, sizeof(iwr)))
1051 return -EFAULT;
1052
1053 iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0;
1054
1055 ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1056 ioctl_standard_call,
1057 ioctl_private_call);
1058 if (ret >= 0 &&
1059 IW_IS_GET(cmd) &&
1060 copy_to_user(arg, &iwr, sizeof(struct iwreq)))
1061 return -EFAULT;
1062
1063 return ret;
1064 }
1065
1066 #ifdef CONFIG_COMPAT
compat_standard_call(struct net_device * dev,struct iwreq * iwr,unsigned int cmd,struct iw_request_info * info,iw_handler handler)1067 static int compat_standard_call(struct net_device *dev,
1068 struct iwreq *iwr,
1069 unsigned int cmd,
1070 struct iw_request_info *info,
1071 iw_handler handler)
1072 {
1073 const struct iw_ioctl_description *descr;
1074 struct compat_iw_point *iwp_compat;
1075 struct iw_point iwp;
1076 int err;
1077
1078 descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1079
1080 if (descr->header_type != IW_HEADER_TYPE_POINT)
1081 return ioctl_standard_call(dev, iwr, cmd, info, handler);
1082
1083 iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1084 iwp.pointer = compat_ptr(iwp_compat->pointer);
1085 iwp.length = iwp_compat->length;
1086 iwp.flags = iwp_compat->flags;
1087
1088 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1089
1090 iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1091 iwp_compat->length = iwp.length;
1092 iwp_compat->flags = iwp.flags;
1093
1094 return err;
1095 }
1096
compat_wext_handle_ioctl(struct net * net,unsigned int cmd,unsigned long arg)1097 int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1098 unsigned long arg)
1099 {
1100 void __user *argp = (void __user *)arg;
1101 struct iw_request_info info;
1102 struct iwreq iwr;
1103 char *colon;
1104 int ret;
1105
1106 if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1107 return -EFAULT;
1108
1109 iwr.ifr_name[IFNAMSIZ-1] = 0;
1110 colon = strchr(iwr.ifr_name, ':');
1111 if (colon)
1112 *colon = 0;
1113
1114 info.cmd = cmd;
1115 info.flags = IW_REQUEST_FLAG_COMPAT;
1116
1117 ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1118 compat_standard_call,
1119 compat_private_call);
1120
1121 if (ret >= 0 &&
1122 IW_IS_GET(cmd) &&
1123 copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1124 return -EFAULT;
1125
1126 return ret;
1127 }
1128 #endif
1129
iwe_stream_add_event(struct iw_request_info * info,char * stream,char * ends,struct iw_event * iwe,int event_len)1130 char *iwe_stream_add_event(struct iw_request_info *info, char *stream,
1131 char *ends, struct iw_event *iwe, int event_len)
1132 {
1133 int lcp_len = iwe_stream_lcp_len(info);
1134
1135 event_len = iwe_stream_event_len_adjust(info, event_len);
1136
1137 /* Check if it's possible */
1138 if (likely((stream + event_len) < ends)) {
1139 iwe->len = event_len;
1140 /* Beware of alignement issues on 64 bits */
1141 memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1142 memcpy(stream + lcp_len, &iwe->u,
1143 event_len - lcp_len);
1144 stream += event_len;
1145 }
1146
1147 return stream;
1148 }
1149 EXPORT_SYMBOL(iwe_stream_add_event);
1150
iwe_stream_add_point(struct iw_request_info * info,char * stream,char * ends,struct iw_event * iwe,char * extra)1151 char *iwe_stream_add_point(struct iw_request_info *info, char *stream,
1152 char *ends, struct iw_event *iwe, char *extra)
1153 {
1154 int event_len = iwe_stream_point_len(info) + iwe->u.data.length;
1155 int point_len = iwe_stream_point_len(info);
1156 int lcp_len = iwe_stream_lcp_len(info);
1157
1158 /* Check if it's possible */
1159 if (likely((stream + event_len) < ends)) {
1160 iwe->len = event_len;
1161 memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1162 memcpy(stream + lcp_len,
1163 ((char *) &iwe->u) + IW_EV_POINT_OFF,
1164 IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN);
1165 if (iwe->u.data.length && extra)
1166 memcpy(stream + point_len, extra, iwe->u.data.length);
1167 stream += event_len;
1168 }
1169
1170 return stream;
1171 }
1172 EXPORT_SYMBOL(iwe_stream_add_point);
1173
iwe_stream_add_value(struct iw_request_info * info,char * event,char * value,char * ends,struct iw_event * iwe,int event_len)1174 char *iwe_stream_add_value(struct iw_request_info *info, char *event,
1175 char *value, char *ends, struct iw_event *iwe,
1176 int event_len)
1177 {
1178 int lcp_len = iwe_stream_lcp_len(info);
1179
1180 /* Don't duplicate LCP */
1181 event_len -= IW_EV_LCP_LEN;
1182
1183 /* Check if it's possible */
1184 if (likely((value + event_len) < ends)) {
1185 /* Add new value */
1186 memcpy(value, &iwe->u, event_len);
1187 value += event_len;
1188 /* Patch LCP */
1189 iwe->len = value - event;
1190 memcpy(event, (char *) iwe, lcp_len);
1191 }
1192
1193 return value;
1194 }
1195 EXPORT_SYMBOL(iwe_stream_add_value);
1196