Commit | Line | Data |
---|---|---|
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 | ||
22 | typedef 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 | */ | |
31 | static 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 | 258 | static 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 | */ | |
264 | static 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 | 308 | static const unsigned standard_event_num = ARRAY_SIZE(standard_event); |
1da177e4 | 309 | |
1da177e4 LT |
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 | ||
1dacc76d JB |
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 | |
c2805fbb | 340 | |
1da177e4 | 341 | |
3d23e349 | 342 | /* IW event code */ |
1da177e4 | 343 | |
3d23e349 | 344 | static 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 | 350 | static 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 |
355 | static struct pernet_operations wext_pernet_ops = { |
356 | .init = wext_pernet_init, | |
357 | .exit = wext_pernet_exit, | |
358 | }; | |
1da177e4 | 359 | |
3d23e349 | 360 | static int __init wireless_nlevent_init(void) |
1da177e4 | 361 | { |
3d23e349 | 362 | return register_pernet_subsys(&wext_pernet_ops); |
1da177e4 LT |
363 | } |
364 | ||
3d23e349 | 365 | subsys_initcall(wireless_nlevent_init); |
1da177e4 | 366 | |
3d23e349 JB |
367 | /* Process events generated by the wireless layer or the driver. */ |
368 | static 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 | 384 | static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process); |
1da177e4 | 385 | |
3d23e349 JB |
386 | static 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 |
418 | void 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 | } | |
601 | EXPORT_SYMBOL(wireless_send_event); | |
602 | ||
603 | ||
604 | ||
605 | /* IW handlers */ | |
606 | ||
607 | struct 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 | ||
627 | static 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 | ||
649 | static 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 | ||
683 | static 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 | ||
837 | out: | |
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 | 860 | int 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 |
880 | static 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 | */ | |
932 | static 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 | 943 | static 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 | */ | |
966 | static 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 |
1005 | int 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 |
1023 | static 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 |
1053 | int 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 |