Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[linux-2.6.git] / net / wireless / core.h
1 /*
2  * Wireless configuration interface internals.
3  *
4  * Copyright 2006-2010  Johannes Berg <johannes@sipsolutions.net>
5  */
6 #ifndef __NET_WIRELESS_CORE_H
7 #define __NET_WIRELESS_CORE_H
8 #include <linux/mutex.h>
9 #include <linux/list.h>
10 #include <linux/netdevice.h>
11 #include <linux/kref.h>
12 #include <linux/rbtree.h>
13 #include <linux/debugfs.h>
14 #include <linux/rfkill.h>
15 #include <linux/workqueue.h>
16 #include <net/genetlink.h>
17 #include <net/cfg80211.h>
18 #include "reg.h"
19
20 struct cfg80211_registered_device {
21         const struct cfg80211_ops *ops;
22         struct list_head list;
23         /* we hold this mutex during any call so that
24          * we cannot do multiple calls at once, and also
25          * to avoid the deregister call to proceed while
26          * any call is in progress */
27         struct mutex mtx;
28
29         /* rfkill support */
30         struct rfkill_ops rfkill_ops;
31         struct rfkill *rfkill;
32         struct work_struct rfkill_sync;
33
34         /* ISO / IEC 3166 alpha2 for which this device is receiving
35          * country IEs on, this can help disregard country IEs from APs
36          * on the same alpha2 quickly. The alpha2 may differ from
37          * cfg80211_regdomain's alpha2 when an intersection has occurred.
38          * If the AP is reconfigured this can also be used to tell us if
39          * the country on the country IE changed. */
40         char country_ie_alpha2[2];
41
42         /* If a Country IE has been received this tells us the environment
43          * which its telling us its in. This defaults to ENVIRON_ANY */
44         enum environment_cap env;
45
46         /* wiphy index, internal only */
47         int wiphy_idx;
48
49         /* associate netdev list */
50         struct mutex devlist_mtx;
51         /* protected by devlist_mtx or RCU */
52         struct list_head netdev_list;
53         int devlist_generation;
54         int opencount; /* also protected by devlist_mtx */
55         wait_queue_head_t dev_wait;
56
57         u32 ap_beacons_nlpid;
58
59         /* BSSes/scanning */
60         spinlock_t bss_lock;
61         struct list_head bss_list;
62         struct rb_root bss_tree;
63         u32 bss_generation;
64         struct cfg80211_scan_request *scan_req; /* protected by RTNL */
65         struct cfg80211_sched_scan_request *sched_scan_req;
66         unsigned long suspend_at;
67         struct work_struct scan_done_wk;
68         struct work_struct sched_scan_results_wk;
69
70         struct mutex sched_scan_mtx;
71
72 #ifdef CONFIG_NL80211_TESTMODE
73         struct genl_info *testmode_info;
74 #endif
75
76         struct work_struct conn_work;
77         struct work_struct event_work;
78
79         struct cfg80211_wowlan *wowlan;
80
81         /* must be last because of the way we do wiphy_priv(),
82          * and it should at least be aligned to NETDEV_ALIGN */
83         struct wiphy wiphy __attribute__((__aligned__(NETDEV_ALIGN)));
84 };
85
86 static inline
87 struct cfg80211_registered_device *wiphy_to_dev(struct wiphy *wiphy)
88 {
89         BUG_ON(!wiphy);
90         return container_of(wiphy, struct cfg80211_registered_device, wiphy);
91 }
92
93 /* Note 0 is valid, hence phy0 */
94 static inline
95 bool wiphy_idx_valid(int wiphy_idx)
96 {
97         return wiphy_idx >= 0;
98 }
99
100 static inline void
101 cfg80211_rdev_free_wowlan(struct cfg80211_registered_device *rdev)
102 {
103         int i;
104
105         if (!rdev->wowlan)
106                 return;
107         for (i = 0; i < rdev->wowlan->n_patterns; i++)
108                 kfree(rdev->wowlan->patterns[i].mask);
109         kfree(rdev->wowlan->patterns);
110         kfree(rdev->wowlan);
111 }
112
113 extern struct workqueue_struct *cfg80211_wq;
114 extern struct mutex cfg80211_mutex;
115 extern struct list_head cfg80211_rdev_list;
116 extern int cfg80211_rdev_list_generation;
117
118 static inline void assert_cfg80211_lock(void)
119 {
120         lockdep_assert_held(&cfg80211_mutex);
121 }
122
123 /*
124  * You can use this to mark a wiphy_idx as not having an associated wiphy.
125  * It guarantees cfg80211_rdev_by_wiphy_idx(wiphy_idx) will return NULL
126  */
127 #define WIPHY_IDX_STALE -1
128
129 struct cfg80211_internal_bss {
130         struct list_head list;
131         struct rb_node rbn;
132         unsigned long ts;
133         struct kref ref;
134         atomic_t hold;
135         bool beacon_ies_allocated;
136         bool proberesp_ies_allocated;
137
138         /* must be last because of priv member */
139         struct cfg80211_bss pub;
140 };
141
142 static inline struct cfg80211_internal_bss *bss_from_pub(struct cfg80211_bss *pub)
143 {
144         return container_of(pub, struct cfg80211_internal_bss, pub);
145 }
146
147 static inline void cfg80211_ref_bss(struct cfg80211_internal_bss *bss)
148 {
149         kref_get(&bss->ref);
150 }
151
152 static inline void cfg80211_hold_bss(struct cfg80211_internal_bss *bss)
153 {
154         atomic_inc(&bss->hold);
155 }
156
157 static inline void cfg80211_unhold_bss(struct cfg80211_internal_bss *bss)
158 {
159         int r = atomic_dec_return(&bss->hold);
160         WARN_ON(r < 0);
161 }
162
163
164 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx);
165 int get_wiphy_idx(struct wiphy *wiphy);
166
167 struct cfg80211_registered_device *
168 __cfg80211_rdev_from_info(struct genl_info *info);
169
170 /*
171  * This function returns a pointer to the driver
172  * that the genl_info item that is passed refers to.
173  * If successful, it returns non-NULL and also locks
174  * the driver's mutex!
175  *
176  * This means that you need to call cfg80211_unlock_rdev()
177  * before being allowed to acquire &cfg80211_mutex!
178  *
179  * This is necessary because we need to lock the global
180  * mutex to get an item off the list safely, and then
181  * we lock the rdev mutex so it doesn't go away under us.
182  *
183  * We don't want to keep cfg80211_mutex locked
184  * for all the time in order to allow requests on
185  * other interfaces to go through at the same time.
186  *
187  * The result of this can be a PTR_ERR and hence must
188  * be checked with IS_ERR() for errors.
189  */
190 extern struct cfg80211_registered_device *
191 cfg80211_get_dev_from_info(struct genl_info *info);
192
193 /* requires cfg80211_rdev_mutex to be held! */
194 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx);
195
196 /* identical to cfg80211_get_dev_from_info but only operate on ifindex */
197 extern struct cfg80211_registered_device *
198 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex);
199
200 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
201                           struct net *net);
202
203 static inline void cfg80211_lock_rdev(struct cfg80211_registered_device *rdev)
204 {
205         mutex_lock(&rdev->mtx);
206 }
207
208 static inline void cfg80211_unlock_rdev(struct cfg80211_registered_device *rdev)
209 {
210         BUG_ON(IS_ERR(rdev) || !rdev);
211         mutex_unlock(&rdev->mtx);
212 }
213
214 static inline void wdev_lock(struct wireless_dev *wdev)
215         __acquires(wdev)
216 {
217         mutex_lock(&wdev->mtx);
218         __acquire(wdev->mtx);
219 }
220
221 static inline void wdev_unlock(struct wireless_dev *wdev)
222         __releases(wdev)
223 {
224         __release(wdev->mtx);
225         mutex_unlock(&wdev->mtx);
226 }
227
228 #define ASSERT_RDEV_LOCK(rdev) lockdep_assert_held(&(rdev)->mtx)
229 #define ASSERT_WDEV_LOCK(wdev) lockdep_assert_held(&(wdev)->mtx)
230
231 enum cfg80211_event_type {
232         EVENT_CONNECT_RESULT,
233         EVENT_ROAMED,
234         EVENT_DISCONNECTED,
235         EVENT_IBSS_JOINED,
236 };
237
238 struct cfg80211_event {
239         struct list_head list;
240         enum cfg80211_event_type type;
241
242         union {
243                 struct {
244                         u8 bssid[ETH_ALEN];
245                         const u8 *req_ie;
246                         const u8 *resp_ie;
247                         size_t req_ie_len;
248                         size_t resp_ie_len;
249                         u16 status;
250                 } cr;
251                 struct {
252                         const u8 *req_ie;
253                         const u8 *resp_ie;
254                         size_t req_ie_len;
255                         size_t resp_ie_len;
256                         struct cfg80211_bss *bss;
257                 } rm;
258                 struct {
259                         const u8 *ie;
260                         size_t ie_len;
261                         u16 reason;
262                 } dc;
263                 struct {
264                         u8 bssid[ETH_ALEN];
265                 } ij;
266         };
267 };
268
269 struct cfg80211_cached_keys {
270         struct key_params params[6];
271         u8 data[6][WLAN_MAX_KEY_LEN];
272         int def, defmgmt;
273 };
274
275
276 /* free object */
277 extern void cfg80211_dev_free(struct cfg80211_registered_device *rdev);
278
279 extern int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
280                                char *newname);
281
282 void ieee80211_set_bitrate_flags(struct wiphy *wiphy);
283
284 void cfg80211_bss_expire(struct cfg80211_registered_device *dev);
285 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
286                       unsigned long age_secs);
287
288 /* IBSS */
289 int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
290                          struct net_device *dev,
291                          struct cfg80211_ibss_params *params,
292                          struct cfg80211_cached_keys *connkeys);
293 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
294                        struct net_device *dev,
295                        struct cfg80211_ibss_params *params,
296                        struct cfg80211_cached_keys *connkeys);
297 void cfg80211_clear_ibss(struct net_device *dev, bool nowext);
298 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
299                           struct net_device *dev, bool nowext);
300 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
301                         struct net_device *dev, bool nowext);
302 void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid);
303 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
304                             struct wireless_dev *wdev);
305
306 /* mesh */
307 extern const struct mesh_config default_mesh_config;
308 extern const struct mesh_setup default_mesh_setup;
309 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
310                          struct net_device *dev,
311                          const struct mesh_setup *setup,
312                          const struct mesh_config *conf);
313 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
314                        struct net_device *dev,
315                        const struct mesh_setup *setup,
316                        const struct mesh_config *conf);
317 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
318                         struct net_device *dev);
319
320 /* MLME */
321 int __cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
322                          struct net_device *dev,
323                          struct ieee80211_channel *chan,
324                          enum nl80211_auth_type auth_type,
325                          const u8 *bssid,
326                          const u8 *ssid, int ssid_len,
327                          const u8 *ie, int ie_len,
328                          const u8 *key, int key_len, int key_idx,
329                          bool local_state_change);
330 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
331                        struct net_device *dev, struct ieee80211_channel *chan,
332                        enum nl80211_auth_type auth_type, const u8 *bssid,
333                        const u8 *ssid, int ssid_len,
334                        const u8 *ie, int ie_len,
335                        const u8 *key, int key_len, int key_idx,
336                        bool local_state_change);
337 int __cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
338                           struct net_device *dev,
339                           struct ieee80211_channel *chan,
340                           const u8 *bssid, const u8 *prev_bssid,
341                           const u8 *ssid, int ssid_len,
342                           const u8 *ie, int ie_len, bool use_mfp,
343                           struct cfg80211_crypto_settings *crypt,
344                           u32 assoc_flags, struct ieee80211_ht_cap *ht_capa,
345                           struct ieee80211_ht_cap *ht_capa_mask);
346 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
347                         struct net_device *dev, struct ieee80211_channel *chan,
348                         const u8 *bssid, const u8 *prev_bssid,
349                         const u8 *ssid, int ssid_len,
350                         const u8 *ie, int ie_len, bool use_mfp,
351                         struct cfg80211_crypto_settings *crypt,
352                         u32 assoc_flags, struct ieee80211_ht_cap *ht_capa,
353                         struct ieee80211_ht_cap *ht_capa_mask);
354 int __cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
355                            struct net_device *dev, const u8 *bssid,
356                            const u8 *ie, int ie_len, u16 reason,
357                            bool local_state_change);
358 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
359                          struct net_device *dev, const u8 *bssid,
360                          const u8 *ie, int ie_len, u16 reason,
361                          bool local_state_change);
362 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
363                            struct net_device *dev, const u8 *bssid,
364                            const u8 *ie, int ie_len, u16 reason,
365                            bool local_state_change);
366 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
367                         struct net_device *dev);
368 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
369                                const u8 *req_ie, size_t req_ie_len,
370                                const u8 *resp_ie, size_t resp_ie_len,
371                                u16 status, bool wextev,
372                                struct cfg80211_bss *bss);
373 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_pid,
374                                 u16 frame_type, const u8 *match_data,
375                                 int match_len);
376 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlpid);
377 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev);
378 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
379                           struct net_device *dev,
380                           struct ieee80211_channel *chan, bool offchan,
381                           enum nl80211_channel_type channel_type,
382                           bool channel_type_valid, unsigned int wait,
383                           const u8 *buf, size_t len, bool no_cck,
384                           bool dont_wait_for_ack, u64 *cookie);
385 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
386                                const struct ieee80211_ht_cap *ht_capa_mask);
387
388 /* SME */
389 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
390                        struct net_device *dev,
391                        struct cfg80211_connect_params *connect,
392                        struct cfg80211_cached_keys *connkeys,
393                        const u8 *prev_bssid);
394 int cfg80211_connect(struct cfg80211_registered_device *rdev,
395                      struct net_device *dev,
396                      struct cfg80211_connect_params *connect,
397                      struct cfg80211_cached_keys *connkeys);
398 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
399                           struct net_device *dev, u16 reason,
400                           bool wextev);
401 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
402                         struct net_device *dev, u16 reason,
403                         bool wextev);
404 void __cfg80211_roamed(struct wireless_dev *wdev,
405                        struct cfg80211_bss *bss,
406                        const u8 *req_ie, size_t req_ie_len,
407                        const u8 *resp_ie, size_t resp_ie_len);
408 int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
409                               struct wireless_dev *wdev);
410
411 void cfg80211_conn_work(struct work_struct *work);
412 void cfg80211_sme_failed_assoc(struct wireless_dev *wdev);
413 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev);
414
415 /* internal helpers */
416 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher);
417 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
418                                    struct key_params *params, int key_idx,
419                                    bool pairwise, const u8 *mac_addr);
420 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
421                              size_t ie_len, u16 reason, bool from_ap);
422 void cfg80211_sme_scan_done(struct net_device *dev);
423 void cfg80211_sme_rx_auth(struct net_device *dev, const u8 *buf, size_t len);
424 void cfg80211_sme_disassoc(struct net_device *dev, int idx);
425 void __cfg80211_scan_done(struct work_struct *wk);
426 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak);
427 void __cfg80211_sched_scan_results(struct work_struct *wk);
428 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
429                                bool driver_initiated);
430 void cfg80211_upload_connect_keys(struct wireless_dev *wdev);
431 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
432                           struct net_device *dev, enum nl80211_iftype ntype,
433                           u32 *flags, struct vif_params *params);
434 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev);
435
436 int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
437                                   struct wireless_dev *wdev,
438                                   enum nl80211_iftype iftype);
439
440 static inline int
441 cfg80211_can_add_interface(struct cfg80211_registered_device *rdev,
442                            enum nl80211_iftype iftype)
443 {
444         return cfg80211_can_change_interface(rdev, NULL, iftype);
445 }
446
447 struct ieee80211_channel *
448 rdev_freq_to_chan(struct cfg80211_registered_device *rdev,
449                   int freq, enum nl80211_channel_type channel_type);
450 int cfg80211_set_freq(struct cfg80211_registered_device *rdev,
451                       struct wireless_dev *wdev, int freq,
452                       enum nl80211_channel_type channel_type);
453
454 u16 cfg80211_calculate_bitrate(struct rate_info *rate);
455
456 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
457                            const u8 *rates, unsigned int n_rates,
458                            u32 *mask);
459
460 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
461                                  u32 beacon_int);
462
463 #ifdef CONFIG_CFG80211_DEVELOPER_WARNINGS
464 #define CFG80211_DEV_WARN_ON(cond)      WARN_ON(cond)
465 #else
466 /*
467  * Trick to enable using it as a condition,
468  * and also not give a warning when it's
469  * not used that way.
470  */
471 #define CFG80211_DEV_WARN_ON(cond)      ({bool __r = (cond); __r; })
472 #endif
473
474 #endif /* __NET_WIRELESS_CORE_H */