projects / GitHub / MotorolaMobilityLLC / kernel-slsi.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
net: add moduleparam.h for users of module_param/MODULE_PARM_DESC
[GitHub/MotorolaMobilityLLC/kernel-slsi.git] / net / wireless / wext-core.c
CommitLineData
1da177e4 1/*
3d23e349 2 * This file implement the Wireless Extensions core API.
1da177e4
LT		 3 *
4 * Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
c2805fbb 5 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
3d23e349 6 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
1da177e4
LT		 7 *
8 * (As all part of the Linux kernel, this file is GPL)
9 */
3d23e349
JB		 10#include <linux/kernel.h>
11#include <linux/netdevice.h>
12#include <linux/rtnetlink.h>
5a0e3ad6 13#include <linux/slab.h>
3d23e349
JB		 14#include <linux/wireless.h>
15#include <linux/uaccess.h>
16#include <net/cfg80211.h>
17#include <net/iw_handler.h>
bd5785ba 18#include <net/netlink.h>
295f4a1f 19#include <net/wext.h>
3d23e349
JB		 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);
1da177e4 25
1da177e4 26
1da177e4
LT		 27/*
28 * Meta-data about all the standard Wireless Extension request we
29 * know about.
30 */
31static const struct iw_ioctl_description standard_ioctl[] = {
44608f80 32 [IW_IOCTL_IDX(SIOCSIWCOMMIT)] = {
1da177e4
LT		 33 .header_type = IW_HEADER_TYPE_NULL,
34 },
44608f80 35 [IW_IOCTL_IDX(SIOCGIWNAME)] = {
1da177e4
LT		 36 .header_type = IW_HEADER_TYPE_CHAR,
37 .flags = IW_DESCR_FLAG_DUMP,
38 },
44608f80 39 [IW_IOCTL_IDX(SIOCSIWNWID)] = {
1da177e4
LT		 40 .header_type = IW_HEADER_TYPE_PARAM,
41 .flags = IW_DESCR_FLAG_EVENT,
42 },
44608f80 43 [IW_IOCTL_IDX(SIOCGIWNWID)] = {
1da177e4
LT		 44 .header_type = IW_HEADER_TYPE_PARAM,
45 .flags = IW_DESCR_FLAG_DUMP,
46 },
44608f80 47 [IW_IOCTL_IDX(SIOCSIWFREQ)] = {
1da177e4
LT		 48 .header_type = IW_HEADER_TYPE_FREQ,
49 .flags = IW_DESCR_FLAG_EVENT,
50 },
44608f80 51 [IW_IOCTL_IDX(SIOCGIWFREQ)] = {
1da177e4
LT		 52 .header_type = IW_HEADER_TYPE_FREQ,
53 .flags = IW_DESCR_FLAG_DUMP,
54 },
44608f80 55 [IW_IOCTL_IDX(SIOCSIWMODE)] = {
1da177e4
LT		 56 .header_type = IW_HEADER_TYPE_UINT,
57 .flags = IW_DESCR_FLAG_EVENT,
58 },
44608f80 59 [IW_IOCTL_IDX(SIOCGIWMODE)] = {
1da177e4
LT		 60 .header_type = IW_HEADER_TYPE_UINT,
61 .flags = IW_DESCR_FLAG_DUMP,
62 },
44608f80 63 [IW_IOCTL_IDX(SIOCSIWSENS)] = {
1da177e4
LT		 64 .header_type = IW_HEADER_TYPE_PARAM,
65 },
44608f80 66 [IW_IOCTL_IDX(SIOCGIWSENS)] = {
1da177e4
LT		 67 .header_type = IW_HEADER_TYPE_PARAM,
68 },
44608f80 69 [IW_IOCTL_IDX(SIOCSIWRANGE)] = {
1da177e4
LT		 70 .header_type = IW_HEADER_TYPE_NULL,
71 },
44608f80 72 [IW_IOCTL_IDX(SIOCGIWRANGE)] = {
1da177e4
LT		 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 },
44608f80 78 [IW_IOCTL_IDX(SIOCSIWPRIV)] = {
1da177e4
LT		 79 .header_type = IW_HEADER_TYPE_NULL,
80 },
44608f80 81 [IW_IOCTL_IDX(SIOCGIWPRIV)] = { /* (handled directly by us) */
711e2c33
JT		 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,
1da177e4 86 },
44608f80 87 [IW_IOCTL_IDX(SIOCSIWSTATS)] = {
1da177e4
LT		 88 .header_type = IW_HEADER_TYPE_NULL,
89 },
44608f80 90 [IW_IOCTL_IDX(SIOCGIWSTATS)] = { /* (handled directly by us) */
711e2c33
JT		 91 .header_type = IW_HEADER_TYPE_POINT,
92 .token_size = 1,
93 .max_tokens = sizeof(struct iw_statistics),
1da177e4
LT		 94 .flags = IW_DESCR_FLAG_DUMP,
95 },
44608f80 96 [IW_IOCTL_IDX(SIOCSIWSPY)] = {
1da177e4
LT		 97 .header_type = IW_HEADER_TYPE_POINT,
98 .token_size = sizeof(struct sockaddr),
99 .max_tokens = IW_MAX_SPY,
100 },
44608f80 101 [IW_IOCTL_IDX(SIOCGIWSPY)] = {
1da177e4
LT		 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 },
44608f80 107 [IW_IOCTL_IDX(SIOCSIWTHRSPY)] = {
1da177e4
LT		 108 .header_type = IW_HEADER_TYPE_POINT,
109 .token_size = sizeof(struct iw_thrspy),
110 .min_tokens = 1,
111 .max_tokens = 1,
112 },
44608f80 113 [IW_IOCTL_IDX(SIOCGIWTHRSPY)] = {
1da177e4
LT		 114 .header_type = IW_HEADER_TYPE_POINT,
115 .token_size = sizeof(struct iw_thrspy),
116 .min_tokens = 1,
117 .max_tokens = 1,
118 },
44608f80 119 [IW_IOCTL_IDX(SIOCSIWAP)] = {
1da177e4
LT		 120 .header_type = IW_HEADER_TYPE_ADDR,
121 },
44608f80 122 [IW_IOCTL_IDX(SIOCGIWAP)] = {
1da177e4
LT		 123 .header_type = IW_HEADER_TYPE_ADDR,
124 .flags = IW_DESCR_FLAG_DUMP,
125 },
44608f80 126 [IW_IOCTL_IDX(SIOCSIWMLME)] = {
fff9cfd9 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 },
44608f80 132 [IW_IOCTL_IDX(SIOCGIWAPLIST)] = {
1da177e4
LT		 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 },
44608f80 139 [IW_IOCTL_IDX(SIOCSIWSCAN)] = {
fff9cfd9 140 .header_type = IW_HEADER_TYPE_POINT,
141 .token_size = 1,
142 .min_tokens = 0,
143 .max_tokens = sizeof(struct iw_scan_req),
1da177e4 144 },
44608f80 145 [IW_IOCTL_IDX(SIOCGIWSCAN)] = {
1da177e4
LT		 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 },
44608f80 151 [IW_IOCTL_IDX(SIOCSIWESSID)] = {
1da177e4
LT		 152 .header_type = IW_HEADER_TYPE_POINT,
153 .token_size = 1,
baef1865 154 .max_tokens = IW_ESSID_MAX_SIZE,
1da177e4
LT		 155 .flags = IW_DESCR_FLAG_EVENT,
156 },
44608f80 157 [IW_IOCTL_IDX(SIOCGIWESSID)] = {
1da177e4
LT		 158 .header_type = IW_HEADER_TYPE_POINT,
159 .token_size = 1,
baef1865 160 .max_tokens = IW_ESSID_MAX_SIZE,
1da177e4
LT		 161 .flags = IW_DESCR_FLAG_DUMP,
162 },
44608f80 163 [IW_IOCTL_IDX(SIOCSIWNICKN)] = {
1da177e4
LT		 164 .header_type = IW_HEADER_TYPE_POINT,
165 .token_size = 1,
baef1865 166 .max_tokens = IW_ESSID_MAX_SIZE,
1da177e4 167 },
44608f80 168 [IW_IOCTL_IDX(SIOCGIWNICKN)] = {
1da177e4
LT		 169 .header_type = IW_HEADER_TYPE_POINT,
170 .token_size = 1,
baef1865 171 .max_tokens = IW_ESSID_MAX_SIZE,
1da177e4 172 },
44608f80 173 [IW_IOCTL_IDX(SIOCSIWRATE)] = {
1da177e4
LT		 174 .header_type = IW_HEADER_TYPE_PARAM,
175 },
44608f80 176 [IW_IOCTL_IDX(SIOCGIWRATE)] = {
1da177e4
LT		 177 .header_type = IW_HEADER_TYPE_PARAM,
178 },
44608f80 179 [IW_IOCTL_IDX(SIOCSIWRTS)] = {
1da177e4
LT		 180 .header_type = IW_HEADER_TYPE_PARAM,
181 },
44608f80 182 [IW_IOCTL_IDX(SIOCGIWRTS)] = {
1da177e4
LT		 183 .header_type = IW_HEADER_TYPE_PARAM,
184 },
44608f80 185 [IW_IOCTL_IDX(SIOCSIWFRAG)] = {
1da177e4
LT		 186 .header_type = IW_HEADER_TYPE_PARAM,
187 },
44608f80 188 [IW_IOCTL_IDX(SIOCGIWFRAG)] = {
1da177e4
LT		 189 .header_type = IW_HEADER_TYPE_PARAM,
190 },
44608f80 191 [IW_IOCTL_IDX(SIOCSIWTXPOW)] = {
1da177e4
LT		 192 .header_type = IW_HEADER_TYPE_PARAM,
193 },
44608f80 194 [IW_IOCTL_IDX(SIOCGIWTXPOW)] = {
1da177e4
LT		 195 .header_type = IW_HEADER_TYPE_PARAM,
196 },
44608f80 197 [IW_IOCTL_IDX(SIOCSIWRETRY)] = {
1da177e4
LT		 198 .header_type = IW_HEADER_TYPE_PARAM,
199 },
44608f80 200 [IW_IOCTL_IDX(SIOCGIWRETRY)] = {
1da177e4
LT		 201 .header_type = IW_HEADER_TYPE_PARAM,
202 },
44608f80 203 [IW_IOCTL_IDX(SIOCSIWENCODE)] = {
1da177e4
LT		 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 },
44608f80 209 [IW_IOCTL_IDX(SIOCGIWENCODE)] = {
1da177e4
LT		 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 },
44608f80 215 [IW_IOCTL_IDX(SIOCSIWPOWER)] = {
1da177e4
LT		 216 .header_type = IW_HEADER_TYPE_PARAM,
217 },
44608f80 218 [IW_IOCTL_IDX(SIOCGIWPOWER)] = {
1da177e4
LT		 219 .header_type = IW_HEADER_TYPE_PARAM,
220 },
44608f80 221 [IW_IOCTL_IDX(SIOCSIWGENIE)] = {
fff9cfd9 222 .header_type = IW_HEADER_TYPE_POINT,
223 .token_size = 1,
224 .max_tokens = IW_GENERIC_IE_MAX,
225 },
44608f80 226 [IW_IOCTL_IDX(SIOCGIWGENIE)] = {
fff9cfd9 227 .header_type = IW_HEADER_TYPE_POINT,
228 .token_size = 1,
229 .max_tokens = IW_GENERIC_IE_MAX,
230 },
44608f80 231 [IW_IOCTL_IDX(SIOCSIWAUTH)] = {
fff9cfd9 232 .header_type = IW_HEADER_TYPE_PARAM,
233 },
44608f80 234 [IW_IOCTL_IDX(SIOCGIWAUTH)] = {
fff9cfd9 235 .header_type = IW_HEADER_TYPE_PARAM,
236 },
44608f80 237 [IW_IOCTL_IDX(SIOCSIWENCODEEXT)] = {
fff9cfd9 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 },
44608f80 244 [IW_IOCTL_IDX(SIOCGIWENCODEEXT)] = {
fff9cfd9 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 },
44608f80 251 [IW_IOCTL_IDX(SIOCSIWPMKSA)] = {
fff9cfd9 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 },
1da177e4 257};
1ac58ee3 258static const unsigned standard_ioctl_num = ARRAY_SIZE(standard_ioctl);
1da177e4
LT		 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[] = {
76326f1d 265 [IW_EVENT_IDX(IWEVTXDROP)] = {
1da177e4
LT		 266 .header_type = IW_HEADER_TYPE_ADDR,
267 },
76326f1d 268 [IW_EVENT_IDX(IWEVQUAL)] = {
1da177e4
LT		 269 .header_type = IW_HEADER_TYPE_QUAL,
270 },
76326f1d 271 [IW_EVENT_IDX(IWEVCUSTOM)] = {
1da177e4
LT		 272 .header_type = IW_HEADER_TYPE_POINT,
273 .token_size = 1,
274 .max_tokens = IW_CUSTOM_MAX,
275 },
76326f1d 276 [IW_EVENT_IDX(IWEVREGISTERED)] = {
1da177e4
LT		 277 .header_type = IW_HEADER_TYPE_ADDR,
278 },
76326f1d 279 [IW_EVENT_IDX(IWEVEXPIRED)] = {
4ec93edb 280 .header_type = IW_HEADER_TYPE_ADDR,
1da177e4 281 },
76326f1d 282 [IW_EVENT_IDX(IWEVGENIE)] = {
fff9cfd9 283 .header_type = IW_HEADER_TYPE_POINT,
284 .token_size = 1,
285 .max_tokens = IW_GENERIC_IE_MAX,
286 },
76326f1d 287 [IW_EVENT_IDX(IWEVMICHAELMICFAILURE)] = {
4ec93edb 288 .header_type = IW_HEADER_TYPE_POINT,
fff9cfd9 289 .token_size = 1,
290 .max_tokens = sizeof(struct iw_michaelmicfailure),
291 },
76326f1d 292 [IW_EVENT_IDX(IWEVASSOCREQIE)] = {
fff9cfd9 293 .header_type = IW_HEADER_TYPE_POINT,
294 .token_size = 1,
295 .max_tokens = IW_GENERIC_IE_MAX,
296 },
76326f1d 297 [IW_EVENT_IDX(IWEVASSOCRESPIE)] = {
fff9cfd9 298 .header_type = IW_HEADER_TYPE_POINT,
299 .token_size = 1,
300 .max_tokens = IW_GENERIC_IE_MAX,
301 },
76326f1d 302 [IW_EVENT_IDX(IWEVPMKIDCAND)] = {
fff9cfd9 303 .header_type = IW_HEADER_TYPE_POINT,
304 .token_size = 1,
305 .max_tokens = sizeof(struct iw_pmkid_cand),
306 },
1da177e4 307};
1ac58ee3 308static const unsigned standard_event_num = ARRAY_SIZE(standard_event);
1da177e4 309
1da177e4
LT		 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
1dacc76d
JB		 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
c2805fbb 340
1da177e4 341
3d23e349 342/* IW event code */
1da177e4 343
3d23e349 344static int __net_init wext_pernet_init(struct net *net)
711e2c33 345{
3d23e349
JB		 346 skb_queue_head_init(&net->wext_nlevents);
347 return 0;
711e2c33
JT		 348}
349
3d23e349 350static void __net_exit wext_pernet_exit(struct net *net)
711e2c33 351{
3d23e349 352 skb_queue_purge(&net->wext_nlevents);
711e2c33
JT		 353}
354
3d23e349
JB		 355static struct pernet_operations wext_pernet_ops = {
356 .init = wext_pernet_init,
357 .exit = wext_pernet_exit,
358};
1da177e4 359
3d23e349 360static int __init wireless_nlevent_init(void)
1da177e4 361{
3d23e349 362 return register_pernet_subsys(&wext_pernet_ops);
1da177e4
LT		 363}
364
3d23e349 365subsys_initcall(wireless_nlevent_init);
1da177e4 366
3d23e349
JB		 367/* Process events generated by the wireless layer or the driver. */
368static void wireless_nlevent_process(struct work_struct *work)
7be69c0b 369{
3d23e349
JB		 370 struct sk_buff *skb;
371 struct net *net;
87057825 372
7be69c0b 373 rtnl_lock();
87057825 374
3d23e349
JB		 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 }
7be69c0b 380
7be69c0b
JB		 381 rtnl_unlock();
382}
383
3d23e349 384static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
1da177e4 385
3d23e349
JB		 386static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
387 struct sk_buff *skb)
1da177e4 388{
3d23e349
JB		 389 struct ifinfomsg *r;
390 struct nlmsghdr *nlh;
1da177e4 391
3d23e349
JB		 392 nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
393 if (!nlh)
394 return NULL;
1da177e4 395
3d23e349
JB		 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 */
1da177e4 403
3d23e349 404 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
881d966b 405
3d23e349
JB		 406 return nlh;
407 nla_put_failure:
408 nlmsg_cancel(skb, nlh);
409 return NULL;
881d966b 410}
1da177e4 411
3d23e349 412
1da177e4 413/*
3d23e349
JB		 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.
1da177e4 417 */
3d23e349
JB		 418void wireless_send_event(struct net_device * dev,
419 unsigned int cmd,
420 union iwreq_data * wrqu,
421 const char * extra)
84149b0f 422{
3d23e349
JB		 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
84149b0f 439
3d23e349
JB		 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.
84149b0f 447 */
3d23e349
JB		 448 if (WARN_ON(cmd == SIOCGIWSCAN && extra))
449 extra = NULL;
84149b0f 450
3d23e349
JB		 451 /* Get the description of the Event */
452 if (cmd <= SIOCIWLAST) {
44608f80 453 cmd_index = IW_IOCTL_IDX(cmd);
3d23e349
JB		 454 if (cmd_index < standard_ioctl_num)
455 descr = &(standard_ioctl[cmd_index]);
456 } else {
76326f1d 457 cmd_index = IW_EVENT_IDX(cmd);
3d23e349
JB		 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 */
e9c0268f
JP		 470 netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
471 cmd);
3d23e349
JB		 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) {
e9c0268f
JP		 479 netdev_err(dev, "(WE) : Wireless Event too big (%d)\n",
480 wrqu->data.length);
3d23e349
JB		 481 return;
482 }
483 if (wrqu->data.length < descr->min_tokens) {
e9c0268f
JP		 484 netdev_err(dev, "(WE) : Wireless Event too small (%d)\n",
485 wrqu->data.length);
3d23e349
JB		 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
36539107 616 if (dev->ieee80211_ptr &&
3d23e349
JB		 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 */
44608f80 668 index = IW_IOCTL_IDX(cmd);
3d23e349
JB		 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) {
84149b0f
DM		 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];
8503bd8c
AV		 706 unsigned int len;
707 len = iwp->length * descr->token_size;
84149b0f 708
8503bd8c
AV		 709 if (len > IW_ESSID_MAX_SIZE)
710 return -EFAULT;
711
712 err = copy_from_user(essid, iwp->pointer, len);
84149b0f
DM		 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 }
88f16db7
JB		 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 }
84149b0f
DM		 785 }
786
42da2f94
JB		 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
84149b0f
DM		 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 */
1014eb6e
JT		 824 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
825 ((err == 0) || (err == -EIWCOMMIT))) {
84149b0f
DM		 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
1da177e4 842/*
3d23e349
JB		 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()" ;-)
1da177e4 859 */
3d23e349 860int call_commit_handler(struct net_device *dev)
1da177e4 861{
3d23e349
JB		 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
1da177e4
LT		 874}
875
1da177e4 876/*
295f4a1f 877 * Main IOCTl dispatcher.
1da177e4
LT		 878 * Check the type of IOCTL and call the appropriate wrapper...
879 */
ca1e8bb8
DM		 880static int wireless_process_ioctl(struct net *net, struct ifreq *ifr,
881 unsigned int cmd,
0f5cabba 882 struct iw_request_info *info,
ca1e8bb8
DM		 883 wext_ioctl_func standard,
884 wext_ioctl_func private)
1da177e4 885{
d2911255 886 struct iwreq *iwr = (struct iwreq *) ifr;
1da177e4
LT		 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 */
881d966b 894 if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL)
1da177e4
LT		 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) */
dd8ceabc 900 if (cmd == SIOCGIWSTATS)
0f5cabba 901 return standard(dev, iwr, cmd, info,
ca1e8bb8 902 &iw_handler_get_iwstats);
e71a4783 903
3d23e349 904#ifdef CONFIG_WEXT_PRIV
dd8ceabc 905 if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
0f5cabba 906 return standard(dev, iwr, cmd, info,
3d23e349
JB		 907 iw_handler_get_private);
908#endif
dd8ceabc
JB		 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)
0f5cabba 919 return standard(dev, iwr, cmd, info, handler);
3d23e349 920 else if (private)
0f5cabba 921 return private(dev, iwr, cmd, info, handler);
1da177e4 922 }
dd8ceabc 923 /* Old driver API : call driver ioctl handler */
148bc430
SH		 924 if (dev->netdev_ops->ndo_do_ioctl)
925 return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd);
dd8ceabc 926 return -EOPNOTSUPP;
1da177e4
LT		 927}
928
67dd7608
DM		 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{
f64f9e71
JP		 934 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
935 cmd == SIOCGIWENCODEEXT) &&
936 !capable(CAP_NET_ADMIN))
67dd7608
DM		 937 return -EPERM;
938
939 return 0;
940}
941
295f4a1f 942/* entry point from dev ioctl */
a67fa76d 943static int wext_ioctl_dispatch(struct net *net, struct ifreq *ifr,
0f5cabba 944 unsigned int cmd, struct iw_request_info *info,
a67fa76d
DM		 945 wext_ioctl_func standard,
946 wext_ioctl_func private)
295f4a1f 947{
67dd7608 948 int ret = wext_permission_check(cmd);
295f4a1f 949
67dd7608
DM		 950 if (ret)
951 return ret;
dd8ceabc 952
881d966b 953 dev_load(net, ifr->ifr_name);
295f4a1f 954 rtnl_lock();
0f5cabba 955 ret = wireless_process_ioctl(net, ifr, cmd, info, standard, private);
295f4a1f 956 rtnl_unlock();
a67fa76d
DM		 957
958 return ret;
959}
960
3d23e349
JB		 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 */
44608f80 976 if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
3d23e349 977 return -EOPNOTSUPP;
44608f80 978 descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
3d23e349
JB		 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
a67fa76d
DM		 1005int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
1006 void __user *arg)
1007{
0f5cabba
DM		 1008 struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1009 int ret;
a67fa76d 1010
0f5cabba
DM		 1011 ret = wext_ioctl_dispatch(net, ifr, cmd, &info,
1012 ioctl_standard_call,
1013 ioctl_private_call);
a67fa76d
DM		 1014 if (ret >= 0 &&
1015 IW_IS_GET(cmd) &&
1016 copy_to_user(arg, ifr, sizeof(struct iwreq)))
295f4a1f 1017 return -EFAULT;
a67fa76d 1018
295f4a1f
JB		 1019 return ret;
1020}
711e2c33 1021
87de87d5
DM		 1022#ifdef CONFIG_COMPAT
1023static int compat_standard_call(struct net_device *dev,
1024 struct iwreq *iwr,
1025 unsigned int cmd,
0f5cabba 1026 struct iw_request_info *info,
87de87d5
DM		 1027 iw_handler handler)
1028{
1029 const struct iw_ioctl_description *descr;
1030 struct compat_iw_point *iwp_compat;
87de87d5
DM		 1031 struct iw_point iwp;
1032 int err;
1033
44608f80 1034 descr = standard_ioctl + IW_IOCTL_IDX(cmd);
87de87d5
DM		 1035
1036 if (descr->header_type != IW_HEADER_TYPE_POINT)
0f5cabba 1037 return ioctl_standard_call(dev, iwr, cmd, info, handler);
87de87d5
DM		 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
0f5cabba 1044 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
87de87d5
DM		 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
87de87d5
DM		 1053int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1054 unsigned long arg)
1055{
1056 void __user *argp = (void __user *)arg;
0f5cabba 1057 struct iw_request_info info;
87de87d5
DM		 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
0f5cabba
DM		 1070 info.cmd = cmd;
1071 info.flags = IW_REQUEST_FLAG_COMPAT;
1072
1073 ret = wext_ioctl_dispatch(net, (struct ifreq *) &iwr, cmd, &info,
87de87d5
DM		 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
Motorola kernel-slsi