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1/*
2 * This file implement the Wireless Extensions core API.
3 *
4 * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
5 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
6 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
7 *
8 * (As all part of the Linux kernel, this file is GPL)
9 */
10#include <linux/kernel.h>
11#include <linux/netdevice.h>
12#include <linux/rtnetlink.h>
13#include <linux/slab.h>
14#include <linux/wireless.h>
15#include <linux/uaccess.h>
16#include <net/cfg80211.h>
17#include <net/iw_handler.h>
18#include <net/netlink.h>
19#include <net/wext.h>
20#include <net/net_namespace.h>
21
22typedef int (*wext_ioctl_func)(struct net_device *, struct iwreq *,
23 unsigned int, struct iw_request_info *,
24 iw_handler);
25
26
27/*
28 * Meta-data about all the standard Wireless Extension request we
29 * know about.
30 */
31static const struct iw_ioctl_description standard_ioctl[] = {
32 [IW_IOCTL_IDX(SIOCSIWCOMMIT)] = {
33 .header_type = IW_HEADER_TYPE_NULL,
34 },
35 [IW_IOCTL_IDX(SIOCGIWNAME)] = {
36 .header_type = IW_HEADER_TYPE_CHAR,
37 .flags = IW_DESCR_FLAG_DUMP,
38 },
39 [IW_IOCTL_IDX(SIOCSIWNWID)] = {
40 .header_type = IW_HEADER_TYPE_PARAM,
41 .flags = IW_DESCR_FLAG_EVENT,
42 },
43 [IW_IOCTL_IDX(SIOCGIWNWID)] = {
44 .header_type = IW_HEADER_TYPE_PARAM,
45 .flags = IW_DESCR_FLAG_DUMP,
46 },
47 [IW_IOCTL_IDX(SIOCSIWFREQ)] = {
48 .header_type = IW_HEADER_TYPE_FREQ,
49 .flags = IW_DESCR_FLAG_EVENT,
50 },
51 [IW_IOCTL_IDX(SIOCGIWFREQ)] = {
52 .header_type = IW_HEADER_TYPE_FREQ,
53 .flags = IW_DESCR_FLAG_DUMP,
54 },
55 [IW_IOCTL_IDX(SIOCSIWMODE)] = {
56 .header_type = IW_HEADER_TYPE_UINT,
57 .flags = IW_DESCR_FLAG_EVENT,
58 },
59 [IW_IOCTL_IDX(SIOCGIWMODE)] = {
60 .header_type = IW_HEADER_TYPE_UINT,
61 .flags = IW_DESCR_FLAG_DUMP,
62 },
63 [IW_IOCTL_IDX(SIOCSIWSENS)] = {
64 .header_type = IW_HEADER_TYPE_PARAM,
65 },
66 [IW_IOCTL_IDX(SIOCGIWSENS)] = {
67 .header_type = IW_HEADER_TYPE_PARAM,
68 },
69 [IW_IOCTL_IDX(SIOCSIWRANGE)] = {
70 .header_type = IW_HEADER_TYPE_NULL,
71 },
72 [IW_IOCTL_IDX(SIOCGIWRANGE)] = {
73 .header_type = IW_HEADER_TYPE_POINT,
74 .token_size = 1,
75 .max_tokens = sizeof(struct iw_range),
76 .flags = IW_DESCR_FLAG_DUMP,
77 },
78 [IW_IOCTL_IDX(SIOCSIWPRIV)] = {
79 .header_type = IW_HEADER_TYPE_NULL,
80 },
81 [IW_IOCTL_IDX(SIOCGIWPRIV)] = { /* (handled directly by us) */
82 .header_type = IW_HEADER_TYPE_POINT,
83 .token_size = sizeof(struct iw_priv_args),
84 .max_tokens = 16,
85 .flags = IW_DESCR_FLAG_NOMAX,
86 },
87 [IW_IOCTL_IDX(SIOCSIWSTATS)] = {
88 .header_type = IW_HEADER_TYPE_NULL,
89 },
90 [IW_IOCTL_IDX(SIOCGIWSTATS)] = { /* (handled directly by us) */
91 .header_type = IW_HEADER_TYPE_POINT,
92 .token_size = 1,
93 .max_tokens = sizeof(struct iw_statistics),
94 .flags = IW_DESCR_FLAG_DUMP,
95 },
96 [IW_IOCTL_IDX(SIOCSIWSPY)] = {
97 .header_type = IW_HEADER_TYPE_POINT,
98 .token_size = sizeof(struct sockaddr),
99 .max_tokens = IW_MAX_SPY,
100 },
101 [IW_IOCTL_IDX(SIOCGIWSPY)] = {
102 .header_type = IW_HEADER_TYPE_POINT,
103 .token_size = sizeof(struct sockaddr) +
104 sizeof(struct iw_quality),
105 .max_tokens = IW_MAX_SPY,
106 },
107 [IW_IOCTL_IDX(SIOCSIWTHRSPY)] = {
108 .header_type = IW_HEADER_TYPE_POINT,
109 .token_size = sizeof(struct iw_thrspy),
110 .min_tokens = 1,
111 .max_tokens = 1,
112 },
113 [IW_IOCTL_IDX(SIOCGIWTHRSPY)] = {
114 .header_type = IW_HEADER_TYPE_POINT,
115 .token_size = sizeof(struct iw_thrspy),
116 .min_tokens = 1,
117 .max_tokens = 1,
118 },
119 [IW_IOCTL_IDX(SIOCSIWAP)] = {
120 .header_type = IW_HEADER_TYPE_ADDR,
121 },
122 [IW_IOCTL_IDX(SIOCGIWAP)] = {
123 .header_type = IW_HEADER_TYPE_ADDR,
124 .flags = IW_DESCR_FLAG_DUMP,
125 },
126 [IW_IOCTL_IDX(SIOCSIWMLME)] = {
127 .header_type = IW_HEADER_TYPE_POINT,
128 .token_size = 1,
129 .min_tokens = sizeof(struct iw_mlme),
130 .max_tokens = sizeof(struct iw_mlme),
131 },
132 [IW_IOCTL_IDX(SIOCGIWAPLIST)] = {
133 .header_type = IW_HEADER_TYPE_POINT,
134 .token_size = sizeof(struct sockaddr) +
135 sizeof(struct iw_quality),
136 .max_tokens = IW_MAX_AP,
137 .flags = IW_DESCR_FLAG_NOMAX,
138 },
139 [IW_IOCTL_IDX(SIOCSIWSCAN)] = {
140 .header_type = IW_HEADER_TYPE_POINT,
141 .token_size = 1,
142 .min_tokens = 0,
143 .max_tokens = sizeof(struct iw_scan_req),
144 },
145 [IW_IOCTL_IDX(SIOCGIWSCAN)] = {
146 .header_type = IW_HEADER_TYPE_POINT,
147 .token_size = 1,
148 .max_tokens = IW_SCAN_MAX_DATA,
149 .flags = IW_DESCR_FLAG_NOMAX,
150 },
151 [IW_IOCTL_IDX(SIOCSIWESSID)] = {
152 .header_type = IW_HEADER_TYPE_POINT,
153 .token_size = 1,
154 .max_tokens = IW_ESSID_MAX_SIZE,
155 .flags = IW_DESCR_FLAG_EVENT,
156 },
157 [IW_IOCTL_IDX(SIOCGIWESSID)] = {
158 .header_type = IW_HEADER_TYPE_POINT,
159 .token_size = 1,
160 .max_tokens = IW_ESSID_MAX_SIZE,
161 .flags = IW_DESCR_FLAG_DUMP,
162 },
163 [IW_IOCTL_IDX(SIOCSIWNICKN)] = {
164 .header_type = IW_HEADER_TYPE_POINT,
165 .token_size = 1,
166 .max_tokens = IW_ESSID_MAX_SIZE,
167 },
168 [IW_IOCTL_IDX(SIOCGIWNICKN)] = {
169 .header_type = IW_HEADER_TYPE_POINT,
170 .token_size = 1,
171 .max_tokens = IW_ESSID_MAX_SIZE,
172 },
173 [IW_IOCTL_IDX(SIOCSIWRATE)] = {
174 .header_type = IW_HEADER_TYPE_PARAM,
175 },
176 [IW_IOCTL_IDX(SIOCGIWRATE)] = {
177 .header_type = IW_HEADER_TYPE_PARAM,
178 },
179 [IW_IOCTL_IDX(SIOCSIWRTS)] = {
180 .header_type = IW_HEADER_TYPE_PARAM,
181 },
182 [IW_IOCTL_IDX(SIOCGIWRTS)] = {
183 .header_type = IW_HEADER_TYPE_PARAM,
184 },
185 [IW_IOCTL_IDX(SIOCSIWFRAG)] = {
186 .header_type = IW_HEADER_TYPE_PARAM,
187 },
188 [IW_IOCTL_IDX(SIOCGIWFRAG)] = {
189 .header_type = IW_HEADER_TYPE_PARAM,
190 },
191 [IW_IOCTL_IDX(SIOCSIWTXPOW)] = {
192 .header_type = IW_HEADER_TYPE_PARAM,
193 },
194 [IW_IOCTL_IDX(SIOCGIWTXPOW)] = {
195 .header_type = IW_HEADER_TYPE_PARAM,
196 },
197 [IW_IOCTL_IDX(SIOCSIWRETRY)] = {
198 .header_type = IW_HEADER_TYPE_PARAM,
199 },
200 [IW_IOCTL_IDX(SIOCGIWRETRY)] = {
201 .header_type = IW_HEADER_TYPE_PARAM,
202 },
203 [IW_IOCTL_IDX(SIOCSIWENCODE)] = {
204 .header_type = IW_HEADER_TYPE_POINT,
205 .token_size = 1,
206 .max_tokens = IW_ENCODING_TOKEN_MAX,
207 .flags = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
208 },
209 [IW_IOCTL_IDX(SIOCGIWENCODE)] = {
210 .header_type = IW_HEADER_TYPE_POINT,
211 .token_size = 1,
212 .max_tokens = IW_ENCODING_TOKEN_MAX,
213 .flags = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
214 },
215 [IW_IOCTL_IDX(SIOCSIWPOWER)] = {
216 .header_type = IW_HEADER_TYPE_PARAM,
217 },
218 [IW_IOCTL_IDX(SIOCGIWPOWER)] = {
219 .header_type = IW_HEADER_TYPE_PARAM,
220 },
221 [IW_IOCTL_IDX(SIOCSIWGENIE)] = {
222 .header_type = IW_HEADER_TYPE_POINT,
223 .token_size = 1,
224 .max_tokens = IW_GENERIC_IE_MAX,
225 },
226 [IW_IOCTL_IDX(SIOCGIWGENIE)] = {
227 .header_type = IW_HEADER_TYPE_POINT,
228 .token_size = 1,
229 .max_tokens = IW_GENERIC_IE_MAX,
230 },
231 [IW_IOCTL_IDX(SIOCSIWAUTH)] = {
232 .header_type = IW_HEADER_TYPE_PARAM,
233 },
234 [IW_IOCTL_IDX(SIOCGIWAUTH)] = {
235 .header_type = IW_HEADER_TYPE_PARAM,
236 },
237 [IW_IOCTL_IDX(SIOCSIWENCODEEXT)] = {
238 .header_type = IW_HEADER_TYPE_POINT,
239 .token_size = 1,
240 .min_tokens = sizeof(struct iw_encode_ext),
241 .max_tokens = sizeof(struct iw_encode_ext) +
242 IW_ENCODING_TOKEN_MAX,
243 },
244 [IW_IOCTL_IDX(SIOCGIWENCODEEXT)] = {
245 .header_type = IW_HEADER_TYPE_POINT,
246 .token_size = 1,
247 .min_tokens = sizeof(struct iw_encode_ext),
248 .max_tokens = sizeof(struct iw_encode_ext) +
249 IW_ENCODING_TOKEN_MAX,
250 },
251 [IW_IOCTL_IDX(SIOCSIWPMKSA)] = {
252 .header_type = IW_HEADER_TYPE_POINT,
253 .token_size = 1,
254 .min_tokens = sizeof(struct iw_pmksa),
255 .max_tokens = sizeof(struct iw_pmksa),
256 },
257};
258static const unsigned standard_ioctl_num = ARRAY_SIZE(standard_ioctl);
259
260/*
261 * Meta-data about all the additional standard Wireless Extension events
262 * we know about.
263 */
264static const struct iw_ioctl_description standard_event[] = {
265 [IW_EVENT_IDX(IWEVTXDROP)] = {
266 .header_type = IW_HEADER_TYPE_ADDR,
267 },
268 [IW_EVENT_IDX(IWEVQUAL)] = {
269 .header_type = IW_HEADER_TYPE_QUAL,
270 },
271 [IW_EVENT_IDX(IWEVCUSTOM)] = {
272 .header_type = IW_HEADER_TYPE_POINT,
273 .token_size = 1,
274 .max_tokens = IW_CUSTOM_MAX,
275 },
276 [IW_EVENT_IDX(IWEVREGISTERED)] = {
277 .header_type = IW_HEADER_TYPE_ADDR,
278 },
279 [IW_EVENT_IDX(IWEVEXPIRED)] = {
280 .header_type = IW_HEADER_TYPE_ADDR,
281 },
282 [IW_EVENT_IDX(IWEVGENIE)] = {
283 .header_type = IW_HEADER_TYPE_POINT,
284 .token_size = 1,
285 .max_tokens = IW_GENERIC_IE_MAX,
286 },
287 [IW_EVENT_IDX(IWEVMICHAELMICFAILURE)] = {
288 .header_type = IW_HEADER_TYPE_POINT,
289 .token_size = 1,
290 .max_tokens = sizeof(struct iw_michaelmicfailure),
291 },
292 [IW_EVENT_IDX(IWEVASSOCREQIE)] = {
293 .header_type = IW_HEADER_TYPE_POINT,
294 .token_size = 1,
295 .max_tokens = IW_GENERIC_IE_MAX,
296 },
297 [IW_EVENT_IDX(IWEVASSOCRESPIE)] = {
298 .header_type = IW_HEADER_TYPE_POINT,
299 .token_size = 1,
300 .max_tokens = IW_GENERIC_IE_MAX,
301 },
302 [IW_EVENT_IDX(IWEVPMKIDCAND)] = {
303 .header_type = IW_HEADER_TYPE_POINT,
304 .token_size = 1,
305 .max_tokens = sizeof(struct iw_pmkid_cand),
306 },
307};
308static const unsigned standard_event_num = ARRAY_SIZE(standard_event);
309
310/* Size (in bytes) of various events */
311static const int event_type_size[] = {
312 IW_EV_LCP_LEN, /* IW_HEADER_TYPE_NULL */
313 0,
314 IW_EV_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
315 0,
316 IW_EV_UINT_LEN, /* IW_HEADER_TYPE_UINT */
317 IW_EV_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
318 IW_EV_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
319 0,
320 IW_EV_POINT_LEN, /* Without variable payload */
321 IW_EV_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
322 IW_EV_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
323};
324
325#ifdef CONFIG_COMPAT
326static const int compat_event_type_size[] = {
327 IW_EV_COMPAT_LCP_LEN, /* IW_HEADER_TYPE_NULL */
328 0,
329 IW_EV_COMPAT_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
330 0,
331 IW_EV_COMPAT_UINT_LEN, /* IW_HEADER_TYPE_UINT */
332 IW_EV_COMPAT_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
333 IW_EV_COMPAT_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
334 0,
335 IW_EV_COMPAT_POINT_LEN, /* Without variable payload */
336 IW_EV_COMPAT_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
337 IW_EV_COMPAT_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
338};
339#endif
340
341
342/* IW event code */
343
344static int __net_init wext_pernet_init(struct net *net)
345{
346 skb_queue_head_init(&net->wext_nlevents);
347 return 0;
348}
349
350static void __net_exit wext_pernet_exit(struct net *net)
351{
352 skb_queue_purge(&net->wext_nlevents);
353}
354
355static struct pernet_operations wext_pernet_ops = {
356 .init = wext_pernet_init,
357 .exit = wext_pernet_exit,
358};
359
360static int __init wireless_nlevent_init(void)
361{
362 return register_pernet_subsys(&wext_pernet_ops);
363}
364
365subsys_initcall(wireless_nlevent_init);
366
367/* Process events generated by the wireless layer or the driver. */
368static void wireless_nlevent_process(struct work_struct *work)
369{
370 struct sk_buff *skb;
371 struct net *net;
372
373 rtnl_lock();
374
375 for_each_net(net) {
376 while ((skb = skb_dequeue(&net->wext_nlevents)))
377 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL,
378 GFP_KERNEL);
379 }
380
381 rtnl_unlock();
382}
383
384static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
385
386static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
387 struct sk_buff *skb)
388{
389 struct ifinfomsg *r;
390 struct nlmsghdr *nlh;
391
392 nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
393 if (!nlh)
394 return NULL;
395
396 r = nlmsg_data(nlh);
397 r->ifi_family = AF_UNSPEC;
398 r->__ifi_pad = 0;
399 r->ifi_type = dev->type;
400 r->ifi_index = dev->ifindex;
401 r->ifi_flags = dev_get_flags(dev);
402 r->ifi_change = 0; /* Wireless changes don't affect those flags */
403
404 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
405
406 return nlh;
407 nla_put_failure:
408 nlmsg_cancel(skb, nlh);
409 return NULL;
410}
411
412
413/*
414 * Main event dispatcher. Called from other parts and drivers.
415 * Send the event on the appropriate channels.
416 * May be called from interrupt context.
417 */
418void wireless_send_event(struct net_device * dev,
419 unsigned int cmd,
420 union iwreq_data * wrqu,
421 const char * extra)
422{
423 const struct iw_ioctl_description * descr = NULL;
424 int extra_len = 0;
425 struct iw_event *event; /* Mallocated whole event */
426 int event_len; /* Its size */
427 int hdr_len; /* Size of the event header */
428 int wrqu_off = 0; /* Offset in wrqu */
429 /* Don't "optimise" the following variable, it will crash */
430 unsigned cmd_index; /* *MUST* be unsigned */
431 struct sk_buff *skb;
432 struct nlmsghdr *nlh;
433 struct nlattr *nla;
434#ifdef CONFIG_COMPAT
435 struct __compat_iw_event *compat_event;
436 struct compat_iw_point compat_wrqu;
437 struct sk_buff *compskb;
438#endif
439
440 /*
441 * Nothing in the kernel sends scan events with data, be safe.
442 * This is necessary because we cannot fix up scan event data
443 * for compat, due to being contained in 'extra', but normally
444 * applications are required to retrieve the scan data anyway
445 * and no data is included in the event, this codifies that
446 * practice.
447 */
448 if (WARN_ON(cmd == SIOCGIWSCAN && extra))
449 extra = NULL;
450
451 /* Get the description of the Event */
452 if (cmd <= SIOCIWLAST) {
453 cmd_index = IW_IOCTL_IDX(cmd);
454 if (cmd_index < standard_ioctl_num)
455 descr = &(standard_ioctl[cmd_index]);
456 } else {
457 cmd_index = IW_EVENT_IDX(cmd);
458 if (cmd_index < standard_event_num)
459 descr = &(standard_event[cmd_index]);
460 }
461 /* Don't accept unknown events */
462 if (descr == NULL) {
463 /* Note : we don't return an error to the driver, because
464 * the driver would not know what to do about it. It can't
465 * return an error to the user, because the event is not
466 * initiated by a user request.
467 * The best the driver could do is to log an error message.
468 * We will do it ourselves instead...
469 */
470 netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
471 cmd);
472 return;
473 }
474
475 /* Check extra parameters and set extra_len */
476 if (descr->header_type == IW_HEADER_TYPE_POINT) {
477 /* Check if number of token fits within bounds */
478 if (wrqu->data.length > descr->max_tokens) {
479 netdev_err(dev, "(WE) : Wireless Event too big (%d)\n",
480 wrqu->data.length);
481 return;
482 }
483 if (wrqu->data.length < descr->min_tokens) {
484 netdev_err(dev, "(WE) : Wireless Event too small (%d)\n",
485 wrqu->data.length);
486 return;
487 }
488 /* Calculate extra_len - extra is NULL for restricted events */
489 if (extra != NULL)
490 extra_len = wrqu->data.length * descr->token_size;
491 /* Always at an offset in wrqu */
492 wrqu_off = IW_EV_POINT_OFF;
493 }
494
495 /* Total length of the event */
496 hdr_len = event_type_size[descr->header_type];
497 event_len = hdr_len + extra_len;
498
499 /*
500 * The problem for 64/32 bit.
501 *
502 * On 64-bit, a regular event is laid out as follows:
503 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
504 * | event.len | event.cmd | p a d d i n g |
505 * | wrqu data ... (with the correct size) |
506 *
507 * This padding exists because we manipulate event->u,
508 * and 'event' is not packed.
509 *
510 * An iw_point event is laid out like this instead:
511 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
512 * | event.len | event.cmd | p a d d i n g |
513 * | iwpnt.len | iwpnt.flg | p a d d i n g |
514 * | extra data ...
515 *
516 * The second padding exists because struct iw_point is extended,
517 * but this depends on the platform...
518 *
519 * On 32-bit, all the padding shouldn't be there.
520 */
521
522 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
523 if (!skb)
524 return;
525
526 /* Send via the RtNetlink event channel */
527 nlh = rtnetlink_ifinfo_prep(dev, skb);
528 if (WARN_ON(!nlh)) {
529 kfree_skb(skb);
530 return;
531 }
532
533 /* Add the wireless events in the netlink packet */
534 nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
535 if (!nla) {
536 kfree_skb(skb);
537 return;
538 }
539 event = nla_data(nla);
540
541 /* Fill event - first clear to avoid data leaking */
542 memset(event, 0, hdr_len);
543 event->len = event_len;
544 event->cmd = cmd;
545 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
546 if (extra_len)
547 memcpy(((char *) event) + hdr_len, extra, extra_len);
548
549 nlmsg_end(skb, nlh);
550#ifdef CONFIG_COMPAT
551 hdr_len = compat_event_type_size[descr->header_type];
552 event_len = hdr_len + extra_len;
553
554 compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
555 if (!compskb) {
556 kfree_skb(skb);
557 return;
558 }
559
560 /* Send via the RtNetlink event channel */
561 nlh = rtnetlink_ifinfo_prep(dev, compskb);
562 if (WARN_ON(!nlh)) {
563 kfree_skb(skb);
564 kfree_skb(compskb);
565 return;
566 }
567
568 /* Add the wireless events in the netlink packet */
569 nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
570 if (!nla) {
571 kfree_skb(skb);
572 kfree_skb(compskb);
573 return;
574 }
575 compat_event = nla_data(nla);
576
577 compat_event->len = event_len;
578 compat_event->cmd = cmd;
579 if (descr->header_type == IW_HEADER_TYPE_POINT) {
580 compat_wrqu.length = wrqu->data.length;
581 compat_wrqu.flags = wrqu->data.flags;
582 memcpy(&compat_event->pointer,
583 ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
584 hdr_len - IW_EV_COMPAT_LCP_LEN);
585 if (extra_len)
586 memcpy(((char *) compat_event) + hdr_len,
587 extra, extra_len);
588 } else {
589 /* extra_len must be zero, so no if (extra) needed */
590 memcpy(&compat_event->pointer, wrqu,
591 hdr_len - IW_EV_COMPAT_LCP_LEN);
592 }
593
594 nlmsg_end(compskb, nlh);
595
596 skb_shinfo(skb)->frag_list = compskb;
597#endif
598 skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
599 schedule_work(&wireless_nlevent_work);
600}
601EXPORT_SYMBOL(wireless_send_event);
602
603
604
605/* IW handlers */
606
607struct iw_statistics *get_wireless_stats(struct net_device *dev)
608{
609#ifdef CONFIG_WIRELESS_EXT
610 if ((dev->wireless_handlers != NULL) &&
611 (dev->wireless_handlers->get_wireless_stats != NULL))
612 return dev->wireless_handlers->get_wireless_stats(dev);
613#endif
614
615#ifdef CONFIG_CFG80211_WEXT
616 if (dev->ieee80211_ptr &&
617 dev->ieee80211_ptr->wiphy &&
618 dev->ieee80211_ptr->wiphy->wext &&
619 dev->ieee80211_ptr->wiphy->wext->get_wireless_stats)
620 return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
621#endif
622
623 /* not found */
624 return NULL;
625}
626
627static int iw_handler_get_iwstats(struct net_device * dev,
628 struct iw_request_info * info,
629 union iwreq_data * wrqu,
630 char * extra)
631{
632 /* Get stats from the driver */
633 struct iw_statistics *stats;
634
635 stats = get_wireless_stats(dev);
636 if (stats) {
637 /* Copy statistics to extra */
638 memcpy(extra, stats, sizeof(struct iw_statistics));
639 wrqu->data.length = sizeof(struct iw_statistics);
640
641 /* Check if we need to clear the updated flag */
642 if (wrqu->data.flags != 0)
643 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
644 return 0;
645 } else
646 return -EOPNOTSUPP;
647}
648
649static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
650{
651 /* Don't "optimise" the following variable, it will crash */
652 unsigned int index; /* *MUST* be unsigned */
653 const struct iw_handler_def *handlers = NULL;
654
655#ifdef CONFIG_CFG80211_WEXT
656 if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
657 handlers = dev->ieee80211_ptr->wiphy->wext;
658#endif
659#ifdef CONFIG_WIRELESS_EXT
660 if (dev->wireless_handlers)
661 handlers = dev->wireless_handlers;
662#endif
663
664 if (!handlers)
665 return NULL;
666
667 /* Try as a standard command */
668 index = IW_IOCTL_IDX(cmd);
669 if (index < handlers->num_standard)
670 return handlers->standard[index];
671
672#ifdef CONFIG_WEXT_PRIV
673 /* Try as a private command */
674 index = cmd - SIOCIWFIRSTPRIV;
675 if (index < handlers->num_private)
676 return handlers->private[index];
677#endif
678
679 /* Not found */
680 return NULL;
681}
682
683static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
684 const struct iw_ioctl_description *descr,
685 iw_handler handler, struct net_device *dev,
686 struct iw_request_info *info)
687{
688 int err, extra_size, user_length = 0, essid_compat = 0;
689 char *extra;
690
691 /* Calculate space needed by arguments. Always allocate
692 * for max space.
693 */
694 extra_size = descr->max_tokens * descr->token_size;
695
696 /* Check need for ESSID compatibility for WE < 21 */
697 switch (cmd) {
698 case SIOCSIWESSID:
699 case SIOCGIWESSID:
700 case SIOCSIWNICKN:
701 case SIOCGIWNICKN:
702 if (iwp->length == descr->max_tokens + 1)
703 essid_compat = 1;
704 else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
705 char essid[IW_ESSID_MAX_SIZE + 1];
706 unsigned int len;
707 len = iwp->length * descr->token_size;
708
709 if (len > IW_ESSID_MAX_SIZE)
710 return -EFAULT;
711
712 err = copy_from_user(essid, iwp->pointer, len);
713 if (err)
714 return -EFAULT;
715
716 if (essid[iwp->length - 1] == '\0')
717 essid_compat = 1;
718 }
719 break;
720 default:
721 break;
722 }
723
724 iwp->length -= essid_compat;
725
726 /* Check what user space is giving us */
727 if (IW_IS_SET(cmd)) {
728 /* Check NULL pointer */
729 if (!iwp->pointer && iwp->length != 0)
730 return -EFAULT;
731 /* Check if number of token fits within bounds */
732 if (iwp->length > descr->max_tokens)
733 return -E2BIG;
734 if (iwp->length < descr->min_tokens)
735 return -EINVAL;
736 } else {
737 /* Check NULL pointer */
738 if (!iwp->pointer)
739 return -EFAULT;
740 /* Save user space buffer size for checking */
741 user_length = iwp->length;
742
743 /* Don't check if user_length > max to allow forward
744 * compatibility. The test user_length < min is
745 * implied by the test at the end.
746 */
747
748 /* Support for very large requests */
749 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
750 (user_length > descr->max_tokens)) {
751 /* Allow userspace to GET more than max so
752 * we can support any size GET requests.
753 * There is still a limit : -ENOMEM.
754 */
755 extra_size = user_length * descr->token_size;
756
757 /* Note : user_length is originally a __u16,
758 * and token_size is controlled by us,
759 * so extra_size won't get negative and
760 * won't overflow...
761 */
762 }
763 }
764
765 /* kzalloc() ensures NULL-termination for essid_compat. */
766 extra = kzalloc(extra_size, GFP_KERNEL);
767 if (!extra)
768 return -ENOMEM;
769
770 /* If it is a SET, get all the extra data in here */
771 if (IW_IS_SET(cmd) && (iwp->length != 0)) {
772 if (copy_from_user(extra, iwp->pointer,
773 iwp->length *
774 descr->token_size)) {
775 err = -EFAULT;
776 goto out;
777 }
778
779 if (cmd == SIOCSIWENCODEEXT) {
780 struct iw_encode_ext *ee = (void *) extra;
781
782 if (iwp->length < sizeof(*ee) + ee->key_len)
783 return -EFAULT;
784 }
785 }
786
787 if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
788 /*
789 * If this is a GET, but not NOMAX, it means that the extra
790 * data is not bounded by userspace, but by max_tokens. Thus
791 * set the length to max_tokens. This matches the extra data
792 * allocation.
793 * The driver should fill it with the number of tokens it
794 * provided, and it may check iwp->length rather than having
795 * knowledge of max_tokens. If the driver doesn't change the
796 * iwp->length, this ioctl just copies back max_token tokens
797 * filled with zeroes. Hopefully the driver isn't claiming
798 * them to be valid data.
799 */
800 iwp->length = descr->max_tokens;
801 }
802
803 err = handler(dev, info, (union iwreq_data *) iwp, extra);
804
805 iwp->length += essid_compat;
806
807 /* If we have something to return to the user */
808 if (!err && IW_IS_GET(cmd)) {
809 /* Check if there is enough buffer up there */
810 if (user_length < iwp->length) {
811 err = -E2BIG;
812 goto out;
813 }
814
815 if (copy_to_user(iwp->pointer, extra,
816 iwp->length *
817 descr->token_size)) {
818 err = -EFAULT;
819 goto out;
820 }
821 }
822
823 /* Generate an event to notify listeners of the change */
824 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
825 ((err == 0) || (err == -EIWCOMMIT))) {
826 union iwreq_data *data = (union iwreq_data *) iwp;
827
828 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
829 /* If the event is restricted, don't
830 * export the payload.
831 */
832 wireless_send_event(dev, cmd, data, NULL);
833 else
834 wireless_send_event(dev, cmd, data, extra);
835 }
836
837out:
838 kfree(extra);
839 return err;
840}
841
842/*
843 * Call the commit handler in the driver
844 * (if exist and if conditions are right)
845 *
846 * Note : our current commit strategy is currently pretty dumb,
847 * but we will be able to improve on that...
848 * The goal is to try to agreagate as many changes as possible
849 * before doing the commit. Drivers that will define a commit handler
850 * are usually those that need a reset after changing parameters, so
851 * we want to minimise the number of reset.
852 * A cool idea is to use a timer : at each "set" command, we re-set the
853 * timer, when the timer eventually fires, we call the driver.
854 * Hopefully, more on that later.
855 *
856 * Also, I'm waiting to see how many people will complain about the
857 * netif_running(dev) test. I'm open on that one...
858 * Hopefully, the driver will remember to do a commit in "open()" ;-)
859 */
860int call_commit_handler(struct net_device *dev)
861{
862#ifdef CONFIG_WIRELESS_EXT
863 if ((netif_running(dev)) &&
864 (dev->wireless_handlers->standard[0] != NULL))
865 /* Call the commit handler on the driver */
866 return dev->wireless_handlers->standard[0](dev, NULL,
867 NULL, NULL);
868 else
869 return 0; /* Command completed successfully */
870#else
871 /* cfg80211 has no commit */
872 return 0;
873#endif
874}
875
876/*
877 * Main IOCTl dispatcher.
878 * Check the type of IOCTL and call the appropriate wrapper...
879 */
880static int wireless_process_ioctl(struct net *net, struct ifreq *ifr,
881 unsigned int cmd,
882 struct iw_request_info *info,
883 wext_ioctl_func standard,
884 wext_ioctl_func private)
885{
886 struct iwreq *iwr = (struct iwreq *) ifr;
887 struct net_device *dev;
888 iw_handler handler;
889
890 /* Permissions are already checked in dev_ioctl() before calling us.
891 * The copy_to/from_user() of ifr is also dealt with in there */
892
893 /* Make sure the device exist */
894 if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL)
895 return -ENODEV;
896
897 /* A bunch of special cases, then the generic case...
898 * Note that 'cmd' is already filtered in dev_ioctl() with
899 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
900 if (cmd == SIOCGIWSTATS)
901 return standard(dev, iwr, cmd, info,
902 &iw_handler_get_iwstats);
903
904#ifdef CONFIG_WEXT_PRIV
905 if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
906 return standard(dev, iwr, cmd, info,
907 iw_handler_get_private);
908#endif
909
910 /* Basic check */
911 if (!netif_device_present(dev))
912 return -ENODEV;
913
914 /* New driver API : try to find the handler */
915 handler = get_handler(dev, cmd);
916 if (handler) {
917 /* Standard and private are not the same */
918 if (cmd < SIOCIWFIRSTPRIV)
919 return standard(dev, iwr, cmd, info, handler);
920 else if (private)
921 return private(dev, iwr, cmd, info, handler);
922 }
923 /* Old driver API : call driver ioctl handler */
924 if (dev->netdev_ops->ndo_do_ioctl)
925 return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd);
926 return -EOPNOTSUPP;
927}
928
929/* If command is `set a parameter', or `get the encoding parameters',
930 * check if the user has the right to do it.
931 */
932static int wext_permission_check(unsigned int cmd)
933{
934 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
935 cmd == SIOCGIWENCODEEXT) &&
936 !capable(CAP_NET_ADMIN))
937 return -EPERM;
938
939 return 0;
940}
941
942/* entry point from dev ioctl */
943static int wext_ioctl_dispatch(struct net *net, struct ifreq *ifr,
944 unsigned int cmd, struct iw_request_info *info,
945 wext_ioctl_func standard,
946 wext_ioctl_func private)
947{
948 int ret = wext_permission_check(cmd);
949
950 if (ret)
951 return ret;
952
953 dev_load(net, ifr->ifr_name);
954 rtnl_lock();
955 ret = wireless_process_ioctl(net, ifr, cmd, info, standard, private);
956 rtnl_unlock();
957
958 return ret;
959}
960
961/*
962 * Wrapper to call a standard Wireless Extension handler.
963 * We do various checks and also take care of moving data between
964 * user space and kernel space.
965 */
966static int ioctl_standard_call(struct net_device * dev,
967 struct iwreq *iwr,
968 unsigned int cmd,
969 struct iw_request_info *info,
970 iw_handler handler)
971{
972 const struct iw_ioctl_description * descr;
973 int ret = -EINVAL;
974
975 /* Get the description of the IOCTL */
976 if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
977 return -EOPNOTSUPP;
978 descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
979
980 /* Check if we have a pointer to user space data or not */
981 if (descr->header_type != IW_HEADER_TYPE_POINT) {
982
983 /* No extra arguments. Trivial to handle */
984 ret = handler(dev, info, &(iwr->u), NULL);
985
986 /* Generate an event to notify listeners of the change */
987 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
988 ((ret == 0) || (ret == -EIWCOMMIT)))
989 wireless_send_event(dev, cmd, &(iwr->u), NULL);
990 } else {
991 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
992 handler, dev, info);
993 }
994
995 /* Call commit handler if needed and defined */
996 if (ret == -EIWCOMMIT)
997 ret = call_commit_handler(dev);
998
999 /* Here, we will generate the appropriate event if needed */
1000
1001 return ret;
1002}
1003
1004
1005int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
1006 void __user *arg)
1007{
1008 struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1009 int ret;
1010
1011 ret = wext_ioctl_dispatch(net, ifr, cmd, &info,
1012 ioctl_standard_call,
1013 ioctl_private_call);
1014 if (ret >= 0 &&
1015 IW_IS_GET(cmd) &&
1016 copy_to_user(arg, ifr, sizeof(struct iwreq)))
1017 return -EFAULT;
1018
1019 return ret;
1020}
1021
1022#ifdef CONFIG_COMPAT
1023static int compat_standard_call(struct net_device *dev,
1024 struct iwreq *iwr,
1025 unsigned int cmd,
1026 struct iw_request_info *info,
1027 iw_handler handler)
1028{
1029 const struct iw_ioctl_description *descr;
1030 struct compat_iw_point *iwp_compat;
1031 struct iw_point iwp;
1032 int err;
1033
1034 descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1035
1036 if (descr->header_type != IW_HEADER_TYPE_POINT)
1037 return ioctl_standard_call(dev, iwr, cmd, info, handler);
1038
1039 iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1040 iwp.pointer = compat_ptr(iwp_compat->pointer);
1041 iwp.length = iwp_compat->length;
1042 iwp.flags = iwp_compat->flags;
1043
1044 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1045
1046 iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1047 iwp_compat->length = iwp.length;
1048 iwp_compat->flags = iwp.flags;
1049
1050 return err;
1051}
1052
1053int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1054 unsigned long arg)
1055{
1056 void __user *argp = (void __user *)arg;
1057 struct iw_request_info info;
1058 struct iwreq iwr;
1059 char *colon;
1060 int ret;
1061
1062 if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1063 return -EFAULT;
1064
1065 iwr.ifr_name[IFNAMSIZ-1] = 0;
1066 colon = strchr(iwr.ifr_name, ':');
1067 if (colon)
1068 *colon = 0;
1069
1070 info.cmd = cmd;
1071 info.flags = IW_REQUEST_FLAG_COMPAT;
1072
1073 ret = wext_ioctl_dispatch(net, (struct ifreq *) &iwr, cmd, &info,
1074 compat_standard_call,
1075 compat_private_call);
1076
1077 if (ret >= 0 &&
1078 IW_IS_GET(cmd) &&
1079 copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1080 return -EFAULT;
1081
1082 return ret;
1083}
1084#endif
1/*
2 * This file implement the Wireless Extensions core API.
3 *
4 * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
5 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
6 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
7 *
8 * (As all part of the Linux kernel, this file is GPL)
9 */
10#include <linux/kernel.h>
11#include <linux/netdevice.h>
12#include <linux/rtnetlink.h>
13#include <linux/slab.h>
14#include <linux/wireless.h>
15#include <linux/uaccess.h>
16#include <linux/export.h>
17#include <net/cfg80211.h>
18#include <net/iw_handler.h>
19#include <net/netlink.h>
20#include <net/wext.h>
21#include <net/net_namespace.h>
22
23typedef int (*wext_ioctl_func)(struct net_device *, struct iwreq *,
24 unsigned int, struct iw_request_info *,
25 iw_handler);
26
27
28/*
29 * Meta-data about all the standard Wireless Extension request we
30 * know about.
31 */
32static const struct iw_ioctl_description standard_ioctl[] = {
33 [IW_IOCTL_IDX(SIOCSIWCOMMIT)] = {
34 .header_type = IW_HEADER_TYPE_NULL,
35 },
36 [IW_IOCTL_IDX(SIOCGIWNAME)] = {
37 .header_type = IW_HEADER_TYPE_CHAR,
38 .flags = IW_DESCR_FLAG_DUMP,
39 },
40 [IW_IOCTL_IDX(SIOCSIWNWID)] = {
41 .header_type = IW_HEADER_TYPE_PARAM,
42 .flags = IW_DESCR_FLAG_EVENT,
43 },
44 [IW_IOCTL_IDX(SIOCGIWNWID)] = {
45 .header_type = IW_HEADER_TYPE_PARAM,
46 .flags = IW_DESCR_FLAG_DUMP,
47 },
48 [IW_IOCTL_IDX(SIOCSIWFREQ)] = {
49 .header_type = IW_HEADER_TYPE_FREQ,
50 .flags = IW_DESCR_FLAG_EVENT,
51 },
52 [IW_IOCTL_IDX(SIOCGIWFREQ)] = {
53 .header_type = IW_HEADER_TYPE_FREQ,
54 .flags = IW_DESCR_FLAG_DUMP,
55 },
56 [IW_IOCTL_IDX(SIOCSIWMODE)] = {
57 .header_type = IW_HEADER_TYPE_UINT,
58 .flags = IW_DESCR_FLAG_EVENT,
59 },
60 [IW_IOCTL_IDX(SIOCGIWMODE)] = {
61 .header_type = IW_HEADER_TYPE_UINT,
62 .flags = IW_DESCR_FLAG_DUMP,
63 },
64 [IW_IOCTL_IDX(SIOCSIWSENS)] = {
65 .header_type = IW_HEADER_TYPE_PARAM,
66 },
67 [IW_IOCTL_IDX(SIOCGIWSENS)] = {
68 .header_type = IW_HEADER_TYPE_PARAM,
69 },
70 [IW_IOCTL_IDX(SIOCSIWRANGE)] = {
71 .header_type = IW_HEADER_TYPE_NULL,
72 },
73 [IW_IOCTL_IDX(SIOCGIWRANGE)] = {
74 .header_type = IW_HEADER_TYPE_POINT,
75 .token_size = 1,
76 .max_tokens = sizeof(struct iw_range),
77 .flags = IW_DESCR_FLAG_DUMP,
78 },
79 [IW_IOCTL_IDX(SIOCSIWPRIV)] = {
80 .header_type = IW_HEADER_TYPE_NULL,
81 },
82 [IW_IOCTL_IDX(SIOCGIWPRIV)] = { /* (handled directly by us) */
83 .header_type = IW_HEADER_TYPE_POINT,
84 .token_size = sizeof(struct iw_priv_args),
85 .max_tokens = 16,
86 .flags = IW_DESCR_FLAG_NOMAX,
87 },
88 [IW_IOCTL_IDX(SIOCSIWSTATS)] = {
89 .header_type = IW_HEADER_TYPE_NULL,
90 },
91 [IW_IOCTL_IDX(SIOCGIWSTATS)] = { /* (handled directly by us) */
92 .header_type = IW_HEADER_TYPE_POINT,
93 .token_size = 1,
94 .max_tokens = sizeof(struct iw_statistics),
95 .flags = IW_DESCR_FLAG_DUMP,
96 },
97 [IW_IOCTL_IDX(SIOCSIWSPY)] = {
98 .header_type = IW_HEADER_TYPE_POINT,
99 .token_size = sizeof(struct sockaddr),
100 .max_tokens = IW_MAX_SPY,
101 },
102 [IW_IOCTL_IDX(SIOCGIWSPY)] = {
103 .header_type = IW_HEADER_TYPE_POINT,
104 .token_size = sizeof(struct sockaddr) +
105 sizeof(struct iw_quality),
106 .max_tokens = IW_MAX_SPY,
107 },
108 [IW_IOCTL_IDX(SIOCSIWTHRSPY)] = {
109 .header_type = IW_HEADER_TYPE_POINT,
110 .token_size = sizeof(struct iw_thrspy),
111 .min_tokens = 1,
112 .max_tokens = 1,
113 },
114 [IW_IOCTL_IDX(SIOCGIWTHRSPY)] = {
115 .header_type = IW_HEADER_TYPE_POINT,
116 .token_size = sizeof(struct iw_thrspy),
117 .min_tokens = 1,
118 .max_tokens = 1,
119 },
120 [IW_IOCTL_IDX(SIOCSIWAP)] = {
121 .header_type = IW_HEADER_TYPE_ADDR,
122 },
123 [IW_IOCTL_IDX(SIOCGIWAP)] = {
124 .header_type = IW_HEADER_TYPE_ADDR,
125 .flags = IW_DESCR_FLAG_DUMP,
126 },
127 [IW_IOCTL_IDX(SIOCSIWMLME)] = {
128 .header_type = IW_HEADER_TYPE_POINT,
129 .token_size = 1,
130 .min_tokens = sizeof(struct iw_mlme),
131 .max_tokens = sizeof(struct iw_mlme),
132 },
133 [IW_IOCTL_IDX(SIOCGIWAPLIST)] = {
134 .header_type = IW_HEADER_TYPE_POINT,
135 .token_size = sizeof(struct sockaddr) +
136 sizeof(struct iw_quality),
137 .max_tokens = IW_MAX_AP,
138 .flags = IW_DESCR_FLAG_NOMAX,
139 },
140 [IW_IOCTL_IDX(SIOCSIWSCAN)] = {
141 .header_type = IW_HEADER_TYPE_POINT,
142 .token_size = 1,
143 .min_tokens = 0,
144 .max_tokens = sizeof(struct iw_scan_req),
145 },
146 [IW_IOCTL_IDX(SIOCGIWSCAN)] = {
147 .header_type = IW_HEADER_TYPE_POINT,
148 .token_size = 1,
149 .max_tokens = IW_SCAN_MAX_DATA,
150 .flags = IW_DESCR_FLAG_NOMAX,
151 },
152 [IW_IOCTL_IDX(SIOCSIWESSID)] = {
153 .header_type = IW_HEADER_TYPE_POINT,
154 .token_size = 1,
155 .max_tokens = IW_ESSID_MAX_SIZE,
156 .flags = IW_DESCR_FLAG_EVENT,
157 },
158 [IW_IOCTL_IDX(SIOCGIWESSID)] = {
159 .header_type = IW_HEADER_TYPE_POINT,
160 .token_size = 1,
161 .max_tokens = IW_ESSID_MAX_SIZE,
162 .flags = IW_DESCR_FLAG_DUMP,
163 },
164 [IW_IOCTL_IDX(SIOCSIWNICKN)] = {
165 .header_type = IW_HEADER_TYPE_POINT,
166 .token_size = 1,
167 .max_tokens = IW_ESSID_MAX_SIZE,
168 },
169 [IW_IOCTL_IDX(SIOCGIWNICKN)] = {
170 .header_type = IW_HEADER_TYPE_POINT,
171 .token_size = 1,
172 .max_tokens = IW_ESSID_MAX_SIZE,
173 },
174 [IW_IOCTL_IDX(SIOCSIWRATE)] = {
175 .header_type = IW_HEADER_TYPE_PARAM,
176 },
177 [IW_IOCTL_IDX(SIOCGIWRATE)] = {
178 .header_type = IW_HEADER_TYPE_PARAM,
179 },
180 [IW_IOCTL_IDX(SIOCSIWRTS)] = {
181 .header_type = IW_HEADER_TYPE_PARAM,
182 },
183 [IW_IOCTL_IDX(SIOCGIWRTS)] = {
184 .header_type = IW_HEADER_TYPE_PARAM,
185 },
186 [IW_IOCTL_IDX(SIOCSIWFRAG)] = {
187 .header_type = IW_HEADER_TYPE_PARAM,
188 },
189 [IW_IOCTL_IDX(SIOCGIWFRAG)] = {
190 .header_type = IW_HEADER_TYPE_PARAM,
191 },
192 [IW_IOCTL_IDX(SIOCSIWTXPOW)] = {
193 .header_type = IW_HEADER_TYPE_PARAM,
194 },
195 [IW_IOCTL_IDX(SIOCGIWTXPOW)] = {
196 .header_type = IW_HEADER_TYPE_PARAM,
197 },
198 [IW_IOCTL_IDX(SIOCSIWRETRY)] = {
199 .header_type = IW_HEADER_TYPE_PARAM,
200 },
201 [IW_IOCTL_IDX(SIOCGIWRETRY)] = {
202 .header_type = IW_HEADER_TYPE_PARAM,
203 },
204 [IW_IOCTL_IDX(SIOCSIWENCODE)] = {
205 .header_type = IW_HEADER_TYPE_POINT,
206 .token_size = 1,
207 .max_tokens = IW_ENCODING_TOKEN_MAX,
208 .flags = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
209 },
210 [IW_IOCTL_IDX(SIOCGIWENCODE)] = {
211 .header_type = IW_HEADER_TYPE_POINT,
212 .token_size = 1,
213 .max_tokens = IW_ENCODING_TOKEN_MAX,
214 .flags = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
215 },
216 [IW_IOCTL_IDX(SIOCSIWPOWER)] = {
217 .header_type = IW_HEADER_TYPE_PARAM,
218 },
219 [IW_IOCTL_IDX(SIOCGIWPOWER)] = {
220 .header_type = IW_HEADER_TYPE_PARAM,
221 },
222 [IW_IOCTL_IDX(SIOCSIWGENIE)] = {
223 .header_type = IW_HEADER_TYPE_POINT,
224 .token_size = 1,
225 .max_tokens = IW_GENERIC_IE_MAX,
226 },
227 [IW_IOCTL_IDX(SIOCGIWGENIE)] = {
228 .header_type = IW_HEADER_TYPE_POINT,
229 .token_size = 1,
230 .max_tokens = IW_GENERIC_IE_MAX,
231 },
232 [IW_IOCTL_IDX(SIOCSIWAUTH)] = {
233 .header_type = IW_HEADER_TYPE_PARAM,
234 },
235 [IW_IOCTL_IDX(SIOCGIWAUTH)] = {
236 .header_type = IW_HEADER_TYPE_PARAM,
237 },
238 [IW_IOCTL_IDX(SIOCSIWENCODEEXT)] = {
239 .header_type = IW_HEADER_TYPE_POINT,
240 .token_size = 1,
241 .min_tokens = sizeof(struct iw_encode_ext),
242 .max_tokens = sizeof(struct iw_encode_ext) +
243 IW_ENCODING_TOKEN_MAX,
244 },
245 [IW_IOCTL_IDX(SIOCGIWENCODEEXT)] = {
246 .header_type = IW_HEADER_TYPE_POINT,
247 .token_size = 1,
248 .min_tokens = sizeof(struct iw_encode_ext),
249 .max_tokens = sizeof(struct iw_encode_ext) +
250 IW_ENCODING_TOKEN_MAX,
251 },
252 [IW_IOCTL_IDX(SIOCSIWPMKSA)] = {
253 .header_type = IW_HEADER_TYPE_POINT,
254 .token_size = 1,
255 .min_tokens = sizeof(struct iw_pmksa),
256 .max_tokens = sizeof(struct iw_pmksa),
257 },
258};
259static const unsigned int standard_ioctl_num = ARRAY_SIZE(standard_ioctl);
260
261/*
262 * Meta-data about all the additional standard Wireless Extension events
263 * we know about.
264 */
265static const struct iw_ioctl_description standard_event[] = {
266 [IW_EVENT_IDX(IWEVTXDROP)] = {
267 .header_type = IW_HEADER_TYPE_ADDR,
268 },
269 [IW_EVENT_IDX(IWEVQUAL)] = {
270 .header_type = IW_HEADER_TYPE_QUAL,
271 },
272 [IW_EVENT_IDX(IWEVCUSTOM)] = {
273 .header_type = IW_HEADER_TYPE_POINT,
274 .token_size = 1,
275 .max_tokens = IW_CUSTOM_MAX,
276 },
277 [IW_EVENT_IDX(IWEVREGISTERED)] = {
278 .header_type = IW_HEADER_TYPE_ADDR,
279 },
280 [IW_EVENT_IDX(IWEVEXPIRED)] = {
281 .header_type = IW_HEADER_TYPE_ADDR,
282 },
283 [IW_EVENT_IDX(IWEVGENIE)] = {
284 .header_type = IW_HEADER_TYPE_POINT,
285 .token_size = 1,
286 .max_tokens = IW_GENERIC_IE_MAX,
287 },
288 [IW_EVENT_IDX(IWEVMICHAELMICFAILURE)] = {
289 .header_type = IW_HEADER_TYPE_POINT,
290 .token_size = 1,
291 .max_tokens = sizeof(struct iw_michaelmicfailure),
292 },
293 [IW_EVENT_IDX(IWEVASSOCREQIE)] = {
294 .header_type = IW_HEADER_TYPE_POINT,
295 .token_size = 1,
296 .max_tokens = IW_GENERIC_IE_MAX,
297 },
298 [IW_EVENT_IDX(IWEVASSOCRESPIE)] = {
299 .header_type = IW_HEADER_TYPE_POINT,
300 .token_size = 1,
301 .max_tokens = IW_GENERIC_IE_MAX,
302 },
303 [IW_EVENT_IDX(IWEVPMKIDCAND)] = {
304 .header_type = IW_HEADER_TYPE_POINT,
305 .token_size = 1,
306 .max_tokens = sizeof(struct iw_pmkid_cand),
307 },
308};
309static const unsigned int standard_event_num = ARRAY_SIZE(standard_event);
310
311/* Size (in bytes) of various events */
312static const int event_type_size[] = {
313 IW_EV_LCP_LEN, /* IW_HEADER_TYPE_NULL */
314 0,
315 IW_EV_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
316 0,
317 IW_EV_UINT_LEN, /* IW_HEADER_TYPE_UINT */
318 IW_EV_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
319 IW_EV_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
320 0,
321 IW_EV_POINT_LEN, /* Without variable payload */
322 IW_EV_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
323 IW_EV_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
324};
325
326#ifdef CONFIG_COMPAT
327static const int compat_event_type_size[] = {
328 IW_EV_COMPAT_LCP_LEN, /* IW_HEADER_TYPE_NULL */
329 0,
330 IW_EV_COMPAT_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
331 0,
332 IW_EV_COMPAT_UINT_LEN, /* IW_HEADER_TYPE_UINT */
333 IW_EV_COMPAT_FREQ_LEN, /* IW_HEADER_TYPE_FREQ */
334 IW_EV_COMPAT_ADDR_LEN, /* IW_HEADER_TYPE_ADDR */
335 0,
336 IW_EV_COMPAT_POINT_LEN, /* Without variable payload */
337 IW_EV_COMPAT_PARAM_LEN, /* IW_HEADER_TYPE_PARAM */
338 IW_EV_COMPAT_QUAL_LEN, /* IW_HEADER_TYPE_QUAL */
339};
340#endif
341
342
343/* IW event code */
344
345void wireless_nlevent_flush(void)
346{
347 struct sk_buff *skb;
348 struct net *net;
349
350 down_read(&net_rwsem);
351 for_each_net(net) {
352 while ((skb = skb_dequeue(&net->wext_nlevents)))
353 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL,
354 GFP_KERNEL);
355 }
356 up_read(&net_rwsem);
357}
358EXPORT_SYMBOL_GPL(wireless_nlevent_flush);
359
360static int wext_netdev_notifier_call(struct notifier_block *nb,
361 unsigned long state, void *ptr)
362{
363 /*
364 * When a netdev changes state in any way, flush all pending messages
365 * to avoid them going out in a strange order, e.g. RTM_NEWLINK after
366 * RTM_DELLINK, or with IFF_UP after without IFF_UP during dev_close()
367 * or similar - all of which could otherwise happen due to delays from
368 * schedule_work().
369 */
370 wireless_nlevent_flush();
371
372 return NOTIFY_OK;
373}
374
375static struct notifier_block wext_netdev_notifier = {
376 .notifier_call = wext_netdev_notifier_call,
377};
378
379static int __net_init wext_pernet_init(struct net *net)
380{
381 skb_queue_head_init(&net->wext_nlevents);
382 return 0;
383}
384
385static void __net_exit wext_pernet_exit(struct net *net)
386{
387 skb_queue_purge(&net->wext_nlevents);
388}
389
390static struct pernet_operations wext_pernet_ops = {
391 .init = wext_pernet_init,
392 .exit = wext_pernet_exit,
393};
394
395static int __init wireless_nlevent_init(void)
396{
397 int err = register_pernet_subsys(&wext_pernet_ops);
398
399 if (err)
400 return err;
401
402 err = register_netdevice_notifier(&wext_netdev_notifier);
403 if (err)
404 unregister_pernet_subsys(&wext_pernet_ops);
405 return err;
406}
407
408subsys_initcall(wireless_nlevent_init);
409
410/* Process events generated by the wireless layer or the driver. */
411static void wireless_nlevent_process(struct work_struct *work)
412{
413 wireless_nlevent_flush();
414}
415
416static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
417
418static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
419 struct sk_buff *skb)
420{
421 struct ifinfomsg *r;
422 struct nlmsghdr *nlh;
423
424 nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
425 if (!nlh)
426 return NULL;
427
428 r = nlmsg_data(nlh);
429 r->ifi_family = AF_UNSPEC;
430 r->__ifi_pad = 0;
431 r->ifi_type = dev->type;
432 r->ifi_index = dev->ifindex;
433 r->ifi_flags = 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 */
451void wireless_send_event(struct net_device * dev,
452 unsigned int cmd,
453 union iwreq_data * wrqu,
454 const char * extra)
455{
456 const struct iw_ioctl_description * descr = NULL;
457 int extra_len = 0;
458 struct iw_event *event; /* Mallocated whole event */
459 int event_len; /* Its size */
460 int hdr_len; /* Size of the event header */
461 int wrqu_off = 0; /* Offset in wrqu */
462 /* Don't "optimise" the following variable, it will crash */
463 unsigned int cmd_index; /* *MUST* be unsigned */
464 struct sk_buff *skb;
465 struct nlmsghdr *nlh;
466 struct nlattr *nla;
467#ifdef CONFIG_COMPAT
468 struct __compat_iw_event *compat_event;
469 struct compat_iw_point compat_wrqu;
470 struct sk_buff *compskb;
471#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}
634EXPORT_SYMBOL(wireless_send_event);
635
636
637
638/* IW handlers */
639
640struct 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 */
661static 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
683static 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
717static 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 /* kzalloc() ensures NULL-termination for essid_compat. */
800 extra = kzalloc(extra_size, GFP_KERNEL);
801 if (!extra)
802 return -ENOMEM;
803
804 /* If it is a SET, get all the extra data in here */
805 if (IW_IS_SET(cmd) && (iwp->length != 0)) {
806 if (copy_from_user(extra, iwp->pointer,
807 iwp->length *
808 descr->token_size)) {
809 err = -EFAULT;
810 goto out;
811 }
812
813 if (cmd == SIOCSIWENCODEEXT) {
814 struct iw_encode_ext *ee = (void *) extra;
815
816 if (iwp->length < sizeof(*ee) + ee->key_len) {
817 err = -EFAULT;
818 goto out;
819 }
820 }
821 }
822
823 if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
824 /*
825 * If this is a GET, but not NOMAX, it means that the extra
826 * data is not bounded by userspace, but by max_tokens. Thus
827 * set the length to max_tokens. This matches the extra data
828 * allocation.
829 * The driver should fill it with the number of tokens it
830 * provided, and it may check iwp->length rather than having
831 * knowledge of max_tokens. If the driver doesn't change the
832 * iwp->length, this ioctl just copies back max_token tokens
833 * filled with zeroes. Hopefully the driver isn't claiming
834 * them to be valid data.
835 */
836 iwp->length = descr->max_tokens;
837 }
838
839 err = handler(dev, info, (union iwreq_data *) iwp, extra);
840
841 iwp->length += essid_compat;
842
843 /* If we have something to return to the user */
844 if (!err && IW_IS_GET(cmd)) {
845 /* Check if there is enough buffer up there */
846 if (user_length < iwp->length) {
847 err = -E2BIG;
848 goto out;
849 }
850
851 if (copy_to_user(iwp->pointer, extra,
852 iwp->length *
853 descr->token_size)) {
854 err = -EFAULT;
855 goto out;
856 }
857 }
858
859 /* Generate an event to notify listeners of the change */
860 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
861 ((err == 0) || (err == -EIWCOMMIT))) {
862 union iwreq_data *data = (union iwreq_data *) iwp;
863
864 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
865 /* If the event is restricted, don't
866 * export the payload.
867 */
868 wireless_send_event(dev, cmd, data, NULL);
869 else
870 wireless_send_event(dev, cmd, data, extra);
871 }
872
873out:
874 kfree(extra);
875 return err;
876}
877
878/*
879 * Call the commit handler in the driver
880 * (if exist and if conditions are right)
881 *
882 * Note : our current commit strategy is currently pretty dumb,
883 * but we will be able to improve on that...
884 * The goal is to try to agreagate as many changes as possible
885 * before doing the commit. Drivers that will define a commit handler
886 * are usually those that need a reset after changing parameters, so
887 * we want to minimise the number of reset.
888 * A cool idea is to use a timer : at each "set" command, we re-set the
889 * timer, when the timer eventually fires, we call the driver.
890 * Hopefully, more on that later.
891 *
892 * Also, I'm waiting to see how many people will complain about the
893 * netif_running(dev) test. I'm open on that one...
894 * Hopefully, the driver will remember to do a commit in "open()" ;-)
895 */
896int call_commit_handler(struct net_device *dev)
897{
898#ifdef CONFIG_WIRELESS_EXT
899 if ((netif_running(dev)) &&
900 (dev->wireless_handlers->standard[0] != NULL))
901 /* Call the commit handler on the driver */
902 return dev->wireless_handlers->standard[0](dev, NULL,
903 NULL, NULL);
904 else
905 return 0; /* Command completed successfully */
906#else
907 /* cfg80211 has no commit */
908 return 0;
909#endif
910}
911
912/*
913 * Main IOCTl dispatcher.
914 * Check the type of IOCTL and call the appropriate wrapper...
915 */
916static int wireless_process_ioctl(struct net *net, struct iwreq *iwr,
917 unsigned int cmd,
918 struct iw_request_info *info,
919 wext_ioctl_func standard,
920 wext_ioctl_func private)
921{
922 struct net_device *dev;
923 iw_handler handler;
924
925 /* Permissions are already checked in dev_ioctl() before calling us.
926 * The copy_to/from_user() of ifr is also dealt with in there */
927
928 /* Make sure the device exist */
929 if ((dev = __dev_get_by_name(net, iwr->ifr_name)) == NULL)
930 return -ENODEV;
931
932 /* A bunch of special cases, then the generic case...
933 * Note that 'cmd' is already filtered in dev_ioctl() with
934 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
935 if (cmd == SIOCGIWSTATS)
936 return standard(dev, iwr, cmd, info,
937 &iw_handler_get_iwstats);
938
939#ifdef CONFIG_WEXT_PRIV
940 if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
941 return standard(dev, iwr, cmd, info,
942 iw_handler_get_private);
943#endif
944
945 /* Basic check */
946 if (!netif_device_present(dev))
947 return -ENODEV;
948
949 /* New driver API : try to find the handler */
950 handler = get_handler(dev, cmd);
951 if (handler) {
952 /* Standard and private are not the same */
953 if (cmd < SIOCIWFIRSTPRIV)
954 return standard(dev, iwr, cmd, info, handler);
955 else if (private)
956 return private(dev, iwr, cmd, info, handler);
957 }
958 return -EOPNOTSUPP;
959}
960
961/* If command is `set a parameter', or `get the encoding parameters',
962 * check if the user has the right to do it.
963 */
964static int wext_permission_check(unsigned int cmd)
965{
966 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
967 cmd == SIOCGIWENCODEEXT) &&
968 !capable(CAP_NET_ADMIN))
969 return -EPERM;
970
971 return 0;
972}
973
974/* entry point from dev ioctl */
975static int wext_ioctl_dispatch(struct net *net, struct iwreq *iwr,
976 unsigned int cmd, struct iw_request_info *info,
977 wext_ioctl_func standard,
978 wext_ioctl_func private)
979{
980 int ret = wext_permission_check(cmd);
981
982 if (ret)
983 return ret;
984
985 dev_load(net, iwr->ifr_name);
986 rtnl_lock();
987 ret = wireless_process_ioctl(net, iwr, cmd, info, standard, private);
988 rtnl_unlock();
989
990 return ret;
991}
992
993/*
994 * Wrapper to call a standard Wireless Extension handler.
995 * We do various checks and also take care of moving data between
996 * user space and kernel space.
997 */
998static int ioctl_standard_call(struct net_device * dev,
999 struct iwreq *iwr,
1000 unsigned int cmd,
1001 struct iw_request_info *info,
1002 iw_handler handler)
1003{
1004 const struct iw_ioctl_description * descr;
1005 int ret = -EINVAL;
1006
1007 /* Get the description of the IOCTL */
1008 if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
1009 return -EOPNOTSUPP;
1010 descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
1011
1012 /* Check if we have a pointer to user space data or not */
1013 if (descr->header_type != IW_HEADER_TYPE_POINT) {
1014
1015 /* No extra arguments. Trivial to handle */
1016 ret = handler(dev, info, &(iwr->u), NULL);
1017
1018 /* Generate an event to notify listeners of the change */
1019 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
1020 ((ret == 0) || (ret == -EIWCOMMIT)))
1021 wireless_send_event(dev, cmd, &(iwr->u), NULL);
1022 } else {
1023 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
1024 handler, dev, info);
1025 }
1026
1027 /* Call commit handler if needed and defined */
1028 if (ret == -EIWCOMMIT)
1029 ret = call_commit_handler(dev);
1030
1031 /* Here, we will generate the appropriate event if needed */
1032
1033 return ret;
1034}
1035
1036
1037int wext_handle_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1038{
1039 struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1040 struct iwreq iwr;
1041 int ret;
1042
1043 if (copy_from_user(&iwr, arg, sizeof(iwr)))
1044 return -EFAULT;
1045
1046 iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0;
1047
1048 ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1049 ioctl_standard_call,
1050 ioctl_private_call);
1051 if (ret >= 0 &&
1052 IW_IS_GET(cmd) &&
1053 copy_to_user(arg, &iwr, sizeof(struct iwreq)))
1054 return -EFAULT;
1055
1056 return ret;
1057}
1058
1059#ifdef CONFIG_COMPAT
1060static int compat_standard_call(struct net_device *dev,
1061 struct iwreq *iwr,
1062 unsigned int cmd,
1063 struct iw_request_info *info,
1064 iw_handler handler)
1065{
1066 const struct iw_ioctl_description *descr;
1067 struct compat_iw_point *iwp_compat;
1068 struct iw_point iwp;
1069 int err;
1070
1071 descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1072
1073 if (descr->header_type != IW_HEADER_TYPE_POINT)
1074 return ioctl_standard_call(dev, iwr, cmd, info, handler);
1075
1076 iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1077 iwp.pointer = compat_ptr(iwp_compat->pointer);
1078 iwp.length = iwp_compat->length;
1079 iwp.flags = iwp_compat->flags;
1080
1081 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1082
1083 iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1084 iwp_compat->length = iwp.length;
1085 iwp_compat->flags = iwp.flags;
1086
1087 return err;
1088}
1089
1090int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1091 unsigned long arg)
1092{
1093 void __user *argp = (void __user *)arg;
1094 struct iw_request_info info;
1095 struct iwreq iwr;
1096 char *colon;
1097 int ret;
1098
1099 if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1100 return -EFAULT;
1101
1102 iwr.ifr_name[IFNAMSIZ-1] = 0;
1103 colon = strchr(iwr.ifr_name, ':');
1104 if (colon)
1105 *colon = 0;
1106
1107 info.cmd = cmd;
1108 info.flags = IW_REQUEST_FLAG_COMPAT;
1109
1110 ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1111 compat_standard_call,
1112 compat_private_call);
1113
1114 if (ret >= 0 &&
1115 IW_IS_GET(cmd) &&
1116 copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1117 return -EFAULT;
1118
1119 return ret;
1120}
1121#endif
1122
1123char *iwe_stream_add_event(struct iw_request_info *info, char *stream,
1124 char *ends, struct iw_event *iwe, int event_len)
1125{
1126 int lcp_len = iwe_stream_lcp_len(info);
1127
1128 event_len = iwe_stream_event_len_adjust(info, event_len);
1129
1130 /* Check if it's possible */
1131 if (likely((stream + event_len) < ends)) {
1132 iwe->len = event_len;
1133 /* Beware of alignement issues on 64 bits */
1134 memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1135 memcpy(stream + lcp_len, &iwe->u,
1136 event_len - lcp_len);
1137 stream += event_len;
1138 }
1139
1140 return stream;
1141}
1142EXPORT_SYMBOL(iwe_stream_add_event);
1143
1144char *iwe_stream_add_point(struct iw_request_info *info, char *stream,
1145 char *ends, struct iw_event *iwe, char *extra)
1146{
1147 int event_len = iwe_stream_point_len(info) + iwe->u.data.length;
1148 int point_len = iwe_stream_point_len(info);
1149 int lcp_len = iwe_stream_lcp_len(info);
1150
1151 /* Check if it's possible */
1152 if (likely((stream + event_len) < ends)) {
1153 iwe->len = event_len;
1154 memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1155 memcpy(stream + lcp_len,
1156 ((char *) &iwe->u) + IW_EV_POINT_OFF,
1157 IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN);
1158 if (iwe->u.data.length && extra)
1159 memcpy(stream + point_len, extra, iwe->u.data.length);
1160 stream += event_len;
1161 }
1162
1163 return stream;
1164}
1165EXPORT_SYMBOL(iwe_stream_add_point);
1166
1167char *iwe_stream_add_value(struct iw_request_info *info, char *event,
1168 char *value, char *ends, struct iw_event *iwe,
1169 int event_len)
1170{
1171 int lcp_len = iwe_stream_lcp_len(info);
1172
1173 /* Don't duplicate LCP */
1174 event_len -= IW_EV_LCP_LEN;
1175
1176 /* Check if it's possible */
1177 if (likely((value + event_len) < ends)) {
1178 /* Add new value */
1179 memcpy(value, &iwe->u, event_len);
1180 value += event_len;
1181 /* Patch LCP */
1182 iwe->len = value - event;
1183 memcpy(event, (char *) iwe, lcp_len);
1184 }
1185
1186 return value;
1187}
1188EXPORT_SYMBOL(iwe_stream_add_value);