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writeback: split writeback_inodes_wb
[linux-2.6/next.git] / net / wireless / wext-core.c
blob0ef17bc42bac05996eab6e2dada02fc67953c3dc
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
22 typedef 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 */
31 static 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 };
258 static 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 */
264 static 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 };
308 static const unsigned standard_event_num = ARRAY_SIZE(standard_event);
309
310 /* Size (in bytes) of various events */
311 static 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
326 static 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
344 static int __net_init wext_pernet_init(struct net *net)
345 {
346 skb_queue_head_init(&net->wext_nlevents);
347 return 0;
348 }
349
350 static void __net_exit wext_pernet_exit(struct net *net)
351 {
352 skb_queue_purge(&net->wext_nlevents);
353 }
354
355 static struct pernet_operations wext_pernet_ops = {
356 .init = wext_pernet_init,
357 .exit = wext_pernet_exit,
358 };
359
360 static int __init wireless_nlevent_init(void)
361 {
362 return register_pernet_subsys(&wext_pernet_ops);
363 }
364
365 subsys_initcall(wireless_nlevent_init);
366
367 /* Process events generated by the wireless layer or the driver. */
368 static 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
384 static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
385
386 static 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 */
418 void 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 printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
471 dev->name, 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 printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length);
480 return;
481 }
482 if (wrqu->data.length < descr->min_tokens) {
483 printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, wrqu->data.length);
484 return;
485 }
486 /* Calculate extra_len - extra is NULL for restricted events */
487 if (extra != NULL)
488 extra_len = wrqu->data.length * descr->token_size;
489 /* Always at an offset in wrqu */
490 wrqu_off = IW_EV_POINT_OFF;
491 }
492
493 /* Total length of the event */
494 hdr_len = event_type_size[descr->header_type];
495 event_len = hdr_len + extra_len;
496
497 /*
498 * The problem for 64/32 bit.
499 *
500 * On 64-bit, a regular event is laid out as follows:
501 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
502 * | event.len | event.cmd | p a d d i n g |
503 * | wrqu data ... (with the correct size) |
504 *
505 * This padding exists because we manipulate event->u,
506 * and 'event' is not packed.
507 *
508 * An iw_point event is laid out like this instead:
509 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
510 * | event.len | event.cmd | p a d d i n g |
511 * | iwpnt.len | iwpnt.flg | p a d d i n g |
512 * | extra data ...
513 *
514 * The second padding exists because struct iw_point is extended,
515 * but this depends on the platform...
516 *
517 * On 32-bit, all the padding shouldn't be there.
518 */
519
520 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
521 if (!skb)
522 return;
523
524 /* Send via the RtNetlink event channel */
525 nlh = rtnetlink_ifinfo_prep(dev, skb);
526 if (WARN_ON(!nlh)) {
527 kfree_skb(skb);
528 return;
529 }
530
531 /* Add the wireless events in the netlink packet */
532 nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
533 if (!nla) {
534 kfree_skb(skb);
535 return;
536 }
537 event = nla_data(nla);
538
539 /* Fill event - first clear to avoid data leaking */
540 memset(event, 0, hdr_len);
541 event->len = event_len;
542 event->cmd = cmd;
543 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
544 if (extra_len)
545 memcpy(((char *) event) + hdr_len, extra, extra_len);
546
547 nlmsg_end(skb, nlh);
548 #ifdef CONFIG_COMPAT
549 hdr_len = compat_event_type_size[descr->header_type];
550 event_len = hdr_len + extra_len;
551
552 compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
553 if (!compskb) {
554 kfree_skb(skb);
555 return;
556 }
557
558 /* Send via the RtNetlink event channel */
559 nlh = rtnetlink_ifinfo_prep(dev, compskb);
560 if (WARN_ON(!nlh)) {
561 kfree_skb(skb);
562 kfree_skb(compskb);
563 return;
564 }
565
566 /* Add the wireless events in the netlink packet */
567 nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
568 if (!nla) {
569 kfree_skb(skb);
570 kfree_skb(compskb);
571 return;
572 }
573 compat_event = nla_data(nla);
574
575 compat_event->len = event_len;
576 compat_event->cmd = cmd;
577 if (descr->header_type == IW_HEADER_TYPE_POINT) {
578 compat_wrqu.length = wrqu->data.length;
579 compat_wrqu.flags = wrqu->data.flags;
580 memcpy(&compat_event->pointer,
581 ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
582 hdr_len - IW_EV_COMPAT_LCP_LEN);
583 if (extra_len)
584 memcpy(((char *) compat_event) + hdr_len,
585 extra, extra_len);
586 } else {
587 /* extra_len must be zero, so no if (extra) needed */
588 memcpy(&compat_event->pointer, wrqu,
589 hdr_len - IW_EV_COMPAT_LCP_LEN);
590 }
591
592 nlmsg_end(compskb, nlh);
593
594 skb_shinfo(skb)->frag_list = compskb;
595 #endif
596 skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
597 schedule_work(&wireless_nlevent_work);
598 }
599 EXPORT_SYMBOL(wireless_send_event);
600
601
602
603 /* IW handlers */
604
605 struct iw_statistics *get_wireless_stats(struct net_device *dev)
606 {
607 #ifdef CONFIG_WIRELESS_EXT
608 if ((dev->wireless_handlers != NULL) &&
609 (dev->wireless_handlers->get_wireless_stats != NULL))
610 return dev->wireless_handlers->get_wireless_stats(dev);
611 #endif
612
613 #ifdef CONFIG_CFG80211_WEXT
614 if (dev->ieee80211_ptr && dev->ieee80211_ptr &&
615 dev->ieee80211_ptr->wiphy &&
616 dev->ieee80211_ptr->wiphy->wext &&
617 dev->ieee80211_ptr->wiphy->wext->get_wireless_stats)
618 return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
619 #endif
620
621 /* not found */
622 return NULL;
623 }
624
625 static int iw_handler_get_iwstats(struct net_device * dev,
626 struct iw_request_info * info,
627 union iwreq_data * wrqu,
628 char * extra)
629 {
630 /* Get stats from the driver */
631 struct iw_statistics *stats;
632
633 stats = get_wireless_stats(dev);
634 if (stats) {
635 /* Copy statistics to extra */
636 memcpy(extra, stats, sizeof(struct iw_statistics));
637 wrqu->data.length = sizeof(struct iw_statistics);
638
639 /* Check if we need to clear the updated flag */
640 if (wrqu->data.flags != 0)
641 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
642 return 0;
643 } else
644 return -EOPNOTSUPP;
645 }
646
647 static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
648 {
649 /* Don't "optimise" the following variable, it will crash */
650 unsigned int index; /* *MUST* be unsigned */
651 const struct iw_handler_def *handlers = NULL;
652
653 #ifdef CONFIG_CFG80211_WEXT
654 if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
655 handlers = dev->ieee80211_ptr->wiphy->wext;
656 #endif
657 #ifdef CONFIG_WIRELESS_EXT
658 if (dev->wireless_handlers)
659 handlers = dev->wireless_handlers;
660 #endif
661
662 if (!handlers)
663 return NULL;
664
665 /* Try as a standard command */
666 index = IW_IOCTL_IDX(cmd);
667 if (index < handlers->num_standard)
668 return handlers->standard[index];
669
670 #ifdef CONFIG_WEXT_PRIV
671 /* Try as a private command */
672 index = cmd - SIOCIWFIRSTPRIV;
673 if (index < handlers->num_private)
674 return handlers->private[index];
675 #endif
676
677 /* Not found */
678 return NULL;
679 }
680
681 static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
682 const struct iw_ioctl_description *descr,
683 iw_handler handler, struct net_device *dev,
684 struct iw_request_info *info)
685 {
686 int err, extra_size, user_length = 0, essid_compat = 0;
687 char *extra;
688
689 /* Calculate space needed by arguments. Always allocate
690 * for max space.
691 */
692 extra_size = descr->max_tokens * descr->token_size;
693
694 /* Check need for ESSID compatibility for WE < 21 */
695 switch (cmd) {
696 case SIOCSIWESSID:
697 case SIOCGIWESSID:
698 case SIOCSIWNICKN:
699 case SIOCGIWNICKN:
700 if (iwp->length == descr->max_tokens + 1)
701 essid_compat = 1;
702 else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
703 char essid[IW_ESSID_MAX_SIZE + 1];
704 unsigned int len;
705 len = iwp->length * descr->token_size;
706
707 if (len > IW_ESSID_MAX_SIZE)
708 return -EFAULT;
709
710 err = copy_from_user(essid, iwp->pointer, len);
711 if (err)
712 return -EFAULT;
713
714 if (essid[iwp->length - 1] == '\0')
715 essid_compat = 1;
716 }
717 break;
718 default:
719 break;
720 }
721
722 iwp->length -= essid_compat;
723
724 /* Check what user space is giving us */
725 if (IW_IS_SET(cmd)) {
726 /* Check NULL pointer */
727 if (!iwp->pointer && iwp->length != 0)
728 return -EFAULT;
729 /* Check if number of token fits within bounds */
730 if (iwp->length > descr->max_tokens)
731 return -E2BIG;
732 if (iwp->length < descr->min_tokens)
733 return -EINVAL;
734 } else {
735 /* Check NULL pointer */
736 if (!iwp->pointer)
737 return -EFAULT;
738 /* Save user space buffer size for checking */
739 user_length = iwp->length;
740
741 /* Don't check if user_length > max to allow forward
742 * compatibility. The test user_length < min is
743 * implied by the test at the end.
744 */
745
746 /* Support for very large requests */
747 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
748 (user_length > descr->max_tokens)) {
749 /* Allow userspace to GET more than max so
750 * we can support any size GET requests.
751 * There is still a limit : -ENOMEM.
752 */
753 extra_size = user_length * descr->token_size;
754
755 /* Note : user_length is originally a __u16,
756 * and token_size is controlled by us,
757 * so extra_size won't get negative and
758 * won't overflow...
759 */
760 }
761 }
762
763 /* kzalloc() ensures NULL-termination for essid_compat. */
764 extra = kzalloc(extra_size, GFP_KERNEL);
765 if (!extra)
766 return -ENOMEM;
767
768 /* If it is a SET, get all the extra data in here */
769 if (IW_IS_SET(cmd) && (iwp->length != 0)) {
770 if (copy_from_user(extra, iwp->pointer,
771 iwp->length *
772 descr->token_size)) {
773 err = -EFAULT;
774 goto out;
775 }
776
777 if (cmd == SIOCSIWENCODEEXT) {
778 struct iw_encode_ext *ee = (void *) extra;
779
780 if (iwp->length < sizeof(*ee) + ee->key_len)
781 return -EFAULT;
782 }
783 }
784
785 err = handler(dev, info, (union iwreq_data *) iwp, extra);
786
787 iwp->length += essid_compat;
788
789 /* If we have something to return to the user */
790 if (!err && IW_IS_GET(cmd)) {
791 /* Check if there is enough buffer up there */
792 if (user_length < iwp->length) {
793 err = -E2BIG;
794 goto out;
795 }
796
797 if (copy_to_user(iwp->pointer, extra,
798 iwp->length *
799 descr->token_size)) {
800 err = -EFAULT;
801 goto out;
802 }
803 }
804
805 /* Generate an event to notify listeners of the change */
806 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
807 ((err == 0) || (err == -EIWCOMMIT))) {
808 union iwreq_data *data = (union iwreq_data *) iwp;
809
810 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
811 /* If the event is restricted, don't
812 * export the payload.
813 */
814 wireless_send_event(dev, cmd, data, NULL);
815 else
816 wireless_send_event(dev, cmd, data, extra);
817 }
818
819 out:
820 kfree(extra);
821 return err;
822 }
823
824 /*
825 * Call the commit handler in the driver
826 * (if exist and if conditions are right)
827 *
828 * Note : our current commit strategy is currently pretty dumb,
829 * but we will be able to improve on that...
830 * The goal is to try to agreagate as many changes as possible
831 * before doing the commit. Drivers that will define a commit handler
832 * are usually those that need a reset after changing parameters, so
833 * we want to minimise the number of reset.
834 * A cool idea is to use a timer : at each "set" command, we re-set the
835 * timer, when the timer eventually fires, we call the driver.
836 * Hopefully, more on that later.
837 *
838 * Also, I'm waiting to see how many people will complain about the
839 * netif_running(dev) test. I'm open on that one...
840 * Hopefully, the driver will remember to do a commit in "open()" ;-)
841 */
842 int call_commit_handler(struct net_device *dev)
843 {
844 #ifdef CONFIG_WIRELESS_EXT
845 if ((netif_running(dev)) &&
846 (dev->wireless_handlers->standard[0] != NULL))
847 /* Call the commit handler on the driver */
848 return dev->wireless_handlers->standard[0](dev, NULL,
849 NULL, NULL);
850 else
851 return 0; /* Command completed successfully */
852 #else
853 /* cfg80211 has no commit */
854 return 0;
855 #endif
856 }
857
858 /*
859 * Main IOCTl dispatcher.
860 * Check the type of IOCTL and call the appropriate wrapper...
861 */
862 static int wireless_process_ioctl(struct net *net, struct ifreq *ifr,
863 unsigned int cmd,
864 struct iw_request_info *info,
865 wext_ioctl_func standard,
866 wext_ioctl_func private)
867 {
868 struct iwreq *iwr = (struct iwreq *) ifr;
869 struct net_device *dev;
870 iw_handler handler;
871
872 /* Permissions are already checked in dev_ioctl() before calling us.
873 * The copy_to/from_user() of ifr is also dealt with in there */
874
875 /* Make sure the device exist */
876 if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL)
877 return -ENODEV;
878
879 /* A bunch of special cases, then the generic case...
880 * Note that 'cmd' is already filtered in dev_ioctl() with
881 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
882 if (cmd == SIOCGIWSTATS)
883 return standard(dev, iwr, cmd, info,
884 &iw_handler_get_iwstats);
885
886 #ifdef CONFIG_WEXT_PRIV
887 if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
888 return standard(dev, iwr, cmd, info,
889 iw_handler_get_private);
890 #endif
891
892 /* Basic check */
893 if (!netif_device_present(dev))
894 return -ENODEV;
895
896 /* New driver API : try to find the handler */
897 handler = get_handler(dev, cmd);
898 if (handler) {
899 /* Standard and private are not the same */
900 if (cmd < SIOCIWFIRSTPRIV)
901 return standard(dev, iwr, cmd, info, handler);
902 else if (private)
903 return private(dev, iwr, cmd, info, handler);
904 }
905 /* Old driver API : call driver ioctl handler */
906 if (dev->netdev_ops->ndo_do_ioctl)
907 return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd);
908 return -EOPNOTSUPP;
909 }
910
911 /* If command is `set a parameter', or `get the encoding parameters',
912 * check if the user has the right to do it.
913 */
914 static int wext_permission_check(unsigned int cmd)
915 {
916 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
917 cmd == SIOCGIWENCODEEXT) &&
918 !capable(CAP_NET_ADMIN))
919 return -EPERM;
920
921 return 0;
922 }
923
924 /* entry point from dev ioctl */
925 static int wext_ioctl_dispatch(struct net *net, struct ifreq *ifr,
926 unsigned int cmd, struct iw_request_info *info,
927 wext_ioctl_func standard,
928 wext_ioctl_func private)
929 {
930 int ret = wext_permission_check(cmd);
931
932 if (ret)
933 return ret;
934
935 dev_load(net, ifr->ifr_name);
936 rtnl_lock();
937 ret = wireless_process_ioctl(net, ifr, cmd, info, standard, private);
938 rtnl_unlock();
939
940 return ret;
941 }
942
943 /*
944 * Wrapper to call a standard Wireless Extension handler.
945 * We do various checks and also take care of moving data between
946 * user space and kernel space.
947 */
948 static int ioctl_standard_call(struct net_device * dev,
949 struct iwreq *iwr,
950 unsigned int cmd,
951 struct iw_request_info *info,
952 iw_handler handler)
953 {
954 const struct iw_ioctl_description * descr;
955 int ret = -EINVAL;
956
957 /* Get the description of the IOCTL */
958 if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
959 return -EOPNOTSUPP;
960 descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
961
962 /* Check if we have a pointer to user space data or not */
963 if (descr->header_type != IW_HEADER_TYPE_POINT) {
964
965 /* No extra arguments. Trivial to handle */
966 ret = handler(dev, info, &(iwr->u), NULL);
967
968 /* Generate an event to notify listeners of the change */
969 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
970 ((ret == 0) || (ret == -EIWCOMMIT)))
971 wireless_send_event(dev, cmd, &(iwr->u), NULL);
972 } else {
973 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
974 handler, dev, info);
975 }
976
977 /* Call commit handler if needed and defined */
978 if (ret == -EIWCOMMIT)
979 ret = call_commit_handler(dev);
980
981 /* Here, we will generate the appropriate event if needed */
982
983 return ret;
984 }
985
986
987 int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
988 void __user *arg)
989 {
990 struct iw_request_info info = { .cmd = cmd, .flags = 0 };
991 int ret;
992
993 ret = wext_ioctl_dispatch(net, ifr, cmd, &info,
994 ioctl_standard_call,
995 ioctl_private_call);
996 if (ret >= 0 &&
997 IW_IS_GET(cmd) &&
998 copy_to_user(arg, ifr, sizeof(struct iwreq)))
999 return -EFAULT;
1000
1001 return ret;
1002 }
1003
1004 #ifdef CONFIG_COMPAT
1005 static int compat_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 struct compat_iw_point *iwp_compat;
1013 struct iw_point iwp;
1014 int err;
1015
1016 descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1017
1018 if (descr->header_type != IW_HEADER_TYPE_POINT)
1019 return ioctl_standard_call(dev, iwr, cmd, info, handler);
1020
1021 iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1022 iwp.pointer = compat_ptr(iwp_compat->pointer);
1023 iwp.length = iwp_compat->length;
1024 iwp.flags = iwp_compat->flags;
1025
1026 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1027
1028 iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1029 iwp_compat->length = iwp.length;
1030 iwp_compat->flags = iwp.flags;
1031
1032 return err;
1033 }
1034
1035 int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1036 unsigned long arg)
1037 {
1038 void __user *argp = (void __user *)arg;
1039 struct iw_request_info info;
1040 struct iwreq iwr;
1041 char *colon;
1042 int ret;
1043
1044 if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1045 return -EFAULT;
1046
1047 iwr.ifr_name[IFNAMSIZ-1] = 0;
1048 colon = strchr(iwr.ifr_name, ':');
1049 if (colon)
1050 *colon = 0;
1051
1052 info.cmd = cmd;
1053 info.flags = IW_REQUEST_FLAG_COMPAT;
1054
1055 ret = wext_ioctl_dispatch(net, (struct ifreq *) &iwr, cmd, &info,
1056 compat_standard_call,
1057 compat_private_call);
1058
1059 if (ret >= 0 &&
1060 IW_IS_GET(cmd) &&
1061 copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1062 return -EFAULT;
1063
1064 return ret;
1065 }
1066 #endif
linux-next