nl80211: allow splitting wiphy information in dumps
[linux-3.10.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/rbtree.h>
12 #include <linux/debugfs.h>
13 #include <linux/rfkill.h>
14 #include <linux/workqueue.h>
15 #include <linux/rtnetlink.h>
16 #include <net/genetlink.h>
17 #include <net/cfg80211.h>
18 #include "reg.h"
19
20
21 #define WIPHY_IDX_INVALID       -1
22
23 struct cfg80211_registered_device {
24         const struct cfg80211_ops *ops;
25         struct list_head list;
26         /* we hold this mutex during any call so that
27          * we cannot do multiple calls at once, and also
28          * to avoid the deregister call to proceed while
29          * any call is in progress */
30         struct mutex mtx;
31
32         /* rfkill support */
33         struct rfkill_ops rfkill_ops;
34         struct rfkill *rfkill;
35         struct work_struct rfkill_sync;
36
37         /* ISO / IEC 3166 alpha2 for which this device is receiving
38          * country IEs on, this can help disregard country IEs from APs
39          * on the same alpha2 quickly. The alpha2 may differ from
40          * cfg80211_regdomain's alpha2 when an intersection has occurred.
41          * If the AP is reconfigured this can also be used to tell us if
42          * the country on the country IE changed. */
43         char country_ie_alpha2[2];
44
45         /* If a Country IE has been received this tells us the environment
46          * which its telling us its in. This defaults to ENVIRON_ANY */
47         enum environment_cap env;
48
49         /* wiphy index, internal only */
50         int wiphy_idx;
51
52         /* associated wireless interfaces */
53         struct mutex devlist_mtx;
54         /* protected by devlist_mtx or RCU */
55         struct list_head wdev_list;
56         int devlist_generation, wdev_id;
57         int opencount; /* also protected by devlist_mtx */
58         wait_queue_head_t dev_wait;
59
60         struct list_head beacon_registrations;
61         spinlock_t beacon_registrations_lock;
62
63         /* protected by RTNL only */
64         int num_running_ifaces;
65         int num_running_monitor_ifaces;
66
67         /* BSSes/scanning */
68         spinlock_t bss_lock;
69         struct list_head bss_list;
70         struct rb_root bss_tree;
71         u32 bss_generation;
72         struct cfg80211_scan_request *scan_req; /* protected by RTNL */
73         struct cfg80211_sched_scan_request *sched_scan_req;
74         unsigned long suspend_at;
75         struct work_struct scan_done_wk;
76         struct work_struct sched_scan_results_wk;
77
78         struct mutex sched_scan_mtx;
79
80 #ifdef CONFIG_NL80211_TESTMODE
81         struct genl_info *testmode_info;
82 #endif
83
84         struct work_struct conn_work;
85         struct work_struct event_work;
86
87         struct cfg80211_wowlan *wowlan;
88
89         struct delayed_work dfs_update_channels_wk;
90
91         /* must be last because of the way we do wiphy_priv(),
92          * and it should at least be aligned to NETDEV_ALIGN */
93         struct wiphy wiphy __aligned(NETDEV_ALIGN);
94 };
95
96 static inline
97 struct cfg80211_registered_device *wiphy_to_dev(struct wiphy *wiphy)
98 {
99         BUG_ON(!wiphy);
100         return container_of(wiphy, struct cfg80211_registered_device, wiphy);
101 }
102
103 static inline void
104 cfg80211_rdev_free_wowlan(struct cfg80211_registered_device *rdev)
105 {
106         int i;
107
108         if (!rdev->wowlan)
109                 return;
110         for (i = 0; i < rdev->wowlan->n_patterns; i++)
111                 kfree(rdev->wowlan->patterns[i].mask);
112         kfree(rdev->wowlan->patterns);
113         if (rdev->wowlan->tcp && rdev->wowlan->tcp->sock)
114                 sock_release(rdev->wowlan->tcp->sock);
115         kfree(rdev->wowlan->tcp);
116         kfree(rdev->wowlan);
117 }
118
119 extern struct workqueue_struct *cfg80211_wq;
120 extern struct mutex cfg80211_mutex;
121 extern struct list_head cfg80211_rdev_list;
122 extern int cfg80211_rdev_list_generation;
123
124 static inline void assert_cfg80211_lock(void)
125 {
126         lockdep_assert_held(&cfg80211_mutex);
127 }
128
129 struct cfg80211_internal_bss {
130         struct list_head list;
131         struct list_head hidden_list;
132         struct rb_node rbn;
133         unsigned long ts;
134         unsigned long refcount;
135         atomic_t hold;
136
137         /* must be last because of priv member */
138         struct cfg80211_bss pub;
139 };
140
141 static inline struct cfg80211_internal_bss *bss_from_pub(struct cfg80211_bss *pub)
142 {
143         return container_of(pub, struct cfg80211_internal_bss, pub);
144 }
145
146 static inline void cfg80211_hold_bss(struct cfg80211_internal_bss *bss)
147 {
148         atomic_inc(&bss->hold);
149 }
150
151 static inline void cfg80211_unhold_bss(struct cfg80211_internal_bss *bss)
152 {
153         int r = atomic_dec_return(&bss->hold);
154         WARN_ON(r < 0);
155 }
156
157
158 struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx);
159 int get_wiphy_idx(struct wiphy *wiphy);
160
161 /* requires cfg80211_rdev_mutex to be held! */
162 struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx);
163
164 /* identical to cfg80211_get_dev_from_info but only operate on ifindex */
165 extern struct cfg80211_registered_device *
166 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex);
167
168 int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
169                           struct net *net);
170
171 static inline void cfg80211_lock_rdev(struct cfg80211_registered_device *rdev)
172 {
173         mutex_lock(&rdev->mtx);
174 }
175
176 static inline void cfg80211_unlock_rdev(struct cfg80211_registered_device *rdev)
177 {
178         BUG_ON(IS_ERR(rdev) || !rdev);
179         mutex_unlock(&rdev->mtx);
180 }
181
182 static inline void wdev_lock(struct wireless_dev *wdev)
183         __acquires(wdev)
184 {
185         mutex_lock(&wdev->mtx);
186         __acquire(wdev->mtx);
187 }
188
189 static inline void wdev_unlock(struct wireless_dev *wdev)
190         __releases(wdev)
191 {
192         __release(wdev->mtx);
193         mutex_unlock(&wdev->mtx);
194 }
195
196 #define ASSERT_RDEV_LOCK(rdev) lockdep_assert_held(&(rdev)->mtx)
197 #define ASSERT_WDEV_LOCK(wdev) lockdep_assert_held(&(wdev)->mtx)
198
199 static inline bool cfg80211_has_monitors_only(struct cfg80211_registered_device *rdev)
200 {
201         ASSERT_RTNL();
202
203         return rdev->num_running_ifaces == rdev->num_running_monitor_ifaces &&
204                rdev->num_running_ifaces > 0;
205 }
206
207 enum cfg80211_event_type {
208         EVENT_CONNECT_RESULT,
209         EVENT_ROAMED,
210         EVENT_DISCONNECTED,
211         EVENT_IBSS_JOINED,
212 };
213
214 struct cfg80211_event {
215         struct list_head list;
216         enum cfg80211_event_type type;
217
218         union {
219                 struct {
220                         u8 bssid[ETH_ALEN];
221                         const u8 *req_ie;
222                         const u8 *resp_ie;
223                         size_t req_ie_len;
224                         size_t resp_ie_len;
225                         u16 status;
226                 } cr;
227                 struct {
228                         const u8 *req_ie;
229                         const u8 *resp_ie;
230                         size_t req_ie_len;
231                         size_t resp_ie_len;
232                         struct cfg80211_bss *bss;
233                 } rm;
234                 struct {
235                         const u8 *ie;
236                         size_t ie_len;
237                         u16 reason;
238                 } dc;
239                 struct {
240                         u8 bssid[ETH_ALEN];
241                 } ij;
242         };
243 };
244
245 struct cfg80211_cached_keys {
246         struct key_params params[6];
247         u8 data[6][WLAN_MAX_KEY_LEN];
248         int def, defmgmt;
249 };
250
251 enum cfg80211_chan_mode {
252         CHAN_MODE_UNDEFINED,
253         CHAN_MODE_SHARED,
254         CHAN_MODE_EXCLUSIVE,
255 };
256
257 struct cfg80211_beacon_registration {
258         struct list_head list;
259         u32 nlportid;
260 };
261
262 /* free object */
263 extern void cfg80211_dev_free(struct cfg80211_registered_device *rdev);
264
265 extern int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
266                                char *newname);
267
268 void ieee80211_set_bitrate_flags(struct wiphy *wiphy);
269
270 void cfg80211_bss_expire(struct cfg80211_registered_device *dev);
271 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
272                       unsigned long age_secs);
273
274 /* IBSS */
275 int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
276                          struct net_device *dev,
277                          struct cfg80211_ibss_params *params,
278                          struct cfg80211_cached_keys *connkeys);
279 int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
280                        struct net_device *dev,
281                        struct cfg80211_ibss_params *params,
282                        struct cfg80211_cached_keys *connkeys);
283 void cfg80211_clear_ibss(struct net_device *dev, bool nowext);
284 int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
285                           struct net_device *dev, bool nowext);
286 int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
287                         struct net_device *dev, bool nowext);
288 void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid);
289 int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
290                             struct wireless_dev *wdev);
291
292 /* mesh */
293 extern const struct mesh_config default_mesh_config;
294 extern const struct mesh_setup default_mesh_setup;
295 int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
296                          struct net_device *dev,
297                          struct mesh_setup *setup,
298                          const struct mesh_config *conf);
299 int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
300                        struct net_device *dev,
301                        struct mesh_setup *setup,
302                        const struct mesh_config *conf);
303 int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
304                         struct net_device *dev);
305 int cfg80211_set_mesh_channel(struct cfg80211_registered_device *rdev,
306                               struct wireless_dev *wdev,
307                               struct cfg80211_chan_def *chandef);
308
309 /* AP */
310 int cfg80211_stop_ap(struct cfg80211_registered_device *rdev,
311                      struct net_device *dev);
312
313 /* MLME */
314 int __cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
315                          struct net_device *dev,
316                          struct ieee80211_channel *chan,
317                          enum nl80211_auth_type auth_type,
318                          const u8 *bssid,
319                          const u8 *ssid, int ssid_len,
320                          const u8 *ie, int ie_len,
321                          const u8 *key, int key_len, int key_idx,
322                          const u8 *sae_data, int sae_data_len);
323 int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
324                        struct net_device *dev, struct ieee80211_channel *chan,
325                        enum nl80211_auth_type auth_type, 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                        const u8 *sae_data, int sae_data_len);
330 int __cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
331                           struct net_device *dev,
332                           struct ieee80211_channel *chan,
333                           const u8 *bssid, const u8 *prev_bssid,
334                           const u8 *ssid, int ssid_len,
335                           const u8 *ie, int ie_len, bool use_mfp,
336                           struct cfg80211_crypto_settings *crypt,
337                           u32 assoc_flags, struct ieee80211_ht_cap *ht_capa,
338                           struct ieee80211_ht_cap *ht_capa_mask);
339 int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
340                         struct net_device *dev, struct ieee80211_channel *chan,
341                         const u8 *bssid, const u8 *prev_bssid,
342                         const u8 *ssid, int ssid_len,
343                         const u8 *ie, int ie_len, bool use_mfp,
344                         struct cfg80211_crypto_settings *crypt,
345                         u32 assoc_flags, struct ieee80211_ht_cap *ht_capa,
346                         struct ieee80211_ht_cap *ht_capa_mask);
347 int __cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
348                            struct net_device *dev, const u8 *bssid,
349                            const u8 *ie, int ie_len, u16 reason,
350                            bool local_state_change);
351 int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
352                          struct net_device *dev, const u8 *bssid,
353                          const u8 *ie, int ie_len, u16 reason,
354                          bool local_state_change);
355 int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
356                            struct net_device *dev, const u8 *bssid,
357                            const u8 *ie, int ie_len, u16 reason,
358                            bool local_state_change);
359 void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
360                         struct net_device *dev);
361 void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
362                                const u8 *req_ie, size_t req_ie_len,
363                                const u8 *resp_ie, size_t resp_ie_len,
364                                u16 status, bool wextev,
365                                struct cfg80211_bss *bss);
366 int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_pid,
367                                 u16 frame_type, const u8 *match_data,
368                                 int match_len);
369 void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlpid);
370 void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev);
371 int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
372                           struct wireless_dev *wdev,
373                           struct ieee80211_channel *chan, bool offchan,
374                           unsigned int wait, const u8 *buf, size_t len,
375                           bool no_cck, bool dont_wait_for_ack, u64 *cookie);
376 void cfg80211_oper_and_ht_capa(struct ieee80211_ht_cap *ht_capa,
377                                const struct ieee80211_ht_cap *ht_capa_mask);
378
379 /* SME */
380 int __cfg80211_connect(struct cfg80211_registered_device *rdev,
381                        struct net_device *dev,
382                        struct cfg80211_connect_params *connect,
383                        struct cfg80211_cached_keys *connkeys,
384                        const u8 *prev_bssid);
385 int cfg80211_connect(struct cfg80211_registered_device *rdev,
386                      struct net_device *dev,
387                      struct cfg80211_connect_params *connect,
388                      struct cfg80211_cached_keys *connkeys);
389 int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
390                           struct net_device *dev, u16 reason,
391                           bool wextev);
392 int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
393                         struct net_device *dev, u16 reason,
394                         bool wextev);
395 void __cfg80211_roamed(struct wireless_dev *wdev,
396                        struct cfg80211_bss *bss,
397                        const u8 *req_ie, size_t req_ie_len,
398                        const u8 *resp_ie, size_t resp_ie_len);
399 int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
400                               struct wireless_dev *wdev);
401
402 void cfg80211_conn_work(struct work_struct *work);
403 void cfg80211_sme_failed_assoc(struct wireless_dev *wdev);
404 bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev);
405
406 /* internal helpers */
407 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher);
408 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
409                                    struct key_params *params, int key_idx,
410                                    bool pairwise, const u8 *mac_addr);
411 void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
412                              size_t ie_len, u16 reason, bool from_ap);
413 void cfg80211_sme_scan_done(struct net_device *dev);
414 void cfg80211_sme_rx_auth(struct net_device *dev, const u8 *buf, size_t len);
415 void cfg80211_sme_disassoc(struct net_device *dev,
416                            struct cfg80211_internal_bss *bss);
417 void __cfg80211_scan_done(struct work_struct *wk);
418 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak);
419 void __cfg80211_sched_scan_results(struct work_struct *wk);
420 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
421                                bool driver_initiated);
422 void cfg80211_upload_connect_keys(struct wireless_dev *wdev);
423 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
424                           struct net_device *dev, enum nl80211_iftype ntype,
425                           u32 *flags, struct vif_params *params);
426 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev);
427 void cfg80211_process_wdev_events(struct wireless_dev *wdev);
428
429 int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
430                                  struct wireless_dev *wdev,
431                                  enum nl80211_iftype iftype,
432                                  struct ieee80211_channel *chan,
433                                  enum cfg80211_chan_mode chanmode,
434                                  u8 radar_detect);
435
436 /**
437  * cfg80211_chandef_dfs_required - checks if radar detection is required
438  * @wiphy: the wiphy to validate against
439  * @chandef: the channel definition to check
440  * Return: 1 if radar detection is required, 0 if it is not, < 0 on error
441  */
442 int cfg80211_chandef_dfs_required(struct wiphy *wiphy,
443                                   const struct cfg80211_chan_def *c);
444
445 void cfg80211_set_dfs_state(struct wiphy *wiphy,
446                             const struct cfg80211_chan_def *chandef,
447                             enum nl80211_dfs_state dfs_state);
448
449 void cfg80211_dfs_channels_update_work(struct work_struct *work);
450
451
452 static inline int
453 cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
454                               struct wireless_dev *wdev,
455                               enum nl80211_iftype iftype)
456 {
457         return cfg80211_can_use_iftype_chan(rdev, wdev, iftype, NULL,
458                                             CHAN_MODE_UNDEFINED, 0);
459 }
460
461 static inline int
462 cfg80211_can_add_interface(struct cfg80211_registered_device *rdev,
463                            enum nl80211_iftype iftype)
464 {
465         return cfg80211_can_change_interface(rdev, NULL, iftype);
466 }
467
468 static inline int
469 cfg80211_can_use_chan(struct cfg80211_registered_device *rdev,
470                       struct wireless_dev *wdev,
471                       struct ieee80211_channel *chan,
472                       enum cfg80211_chan_mode chanmode)
473 {
474         return cfg80211_can_use_iftype_chan(rdev, wdev, wdev->iftype,
475                                             chan, chanmode, 0);
476 }
477
478 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
479 {
480         unsigned long end = jiffies;
481
482         if (end >= start)
483                 return jiffies_to_msecs(end - start);
484
485         return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
486 }
487
488 void
489 cfg80211_get_chan_state(struct wireless_dev *wdev,
490                         struct ieee80211_channel **chan,
491                         enum cfg80211_chan_mode *chanmode);
492
493 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
494                                  struct cfg80211_chan_def *chandef);
495
496 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
497                            const u8 *rates, unsigned int n_rates,
498                            u32 *mask);
499
500 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
501                                  u32 beacon_int);
502
503 void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
504                                enum nl80211_iftype iftype, int num);
505
506 #define CFG80211_MAX_NUM_DIFFERENT_CHANNELS 10
507
508 #ifdef CONFIG_CFG80211_DEVELOPER_WARNINGS
509 #define CFG80211_DEV_WARN_ON(cond)      WARN_ON(cond)
510 #else
511 /*
512  * Trick to enable using it as a condition,
513  * and also not give a warning when it's
514  * not used that way.
515  */
516 #define CFG80211_DEV_WARN_ON(cond)      ({bool __r = (cond); __r; })
517 #endif
518
519 #endif /* __NET_WIRELESS_CORE_H */