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linux/net/wireless/core.h
Sven Neumann eac03e3819 cfg80211: hold reg_mutex when updating regulatory 
The function wiphy_update_regulatory() uses the static variable
last_request and thus needs to be called with reg_mutex held.
This is the case for all users in reg.c, but the function was
exported for use by wiphy_register(), from where it is called
without the lock being held.

Fix this by making wiphy_update_regulatory() private and introducing
regulatory_update() as a wrapper that acquires and holds the lock.

Signed-off-by: Sven Neumann <s.neumann@raumfeld.com>
Cc: John W. Linville <linville@tuxdriver.com>
Cc: Luis R. Rodriguez <mcgrof@gmail.com>
Cc: Daniel Mack <daniel@zonque.org>
Cc: linux-wireless@vger.kernel.org
Acked-by:  Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-09-14 13:26:39 -04:00

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/*
* Wireless configuration interface internals.
*
* Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
*/
#ifndef __NET_WIRELESS_CORE_H
#define __NET_WIRELESS_CORE_H
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/kref.h>
#include <linux/rbtree.h>
#include <linux/debugfs.h>
#include <linux/rfkill.h>
#include <linux/workqueue.h>
#include <net/genetlink.h>
#include <net/cfg80211.h>
#include "reg.h"
struct cfg80211_registered_device {
const struct cfg80211_ops *ops;
struct list_head list;
/* we hold this mutex during any call so that
* we cannot do multiple calls at once, and also
* to avoid the deregister call to proceed while
* any call is in progress */
struct mutex mtx;
/* rfkill support */
struct rfkill_ops rfkill_ops;
struct rfkill *rfkill;
struct work_struct rfkill_sync;
/* ISO / IEC 3166 alpha2 for which this device is receiving
* country IEs on, this can help disregard country IEs from APs
* on the same alpha2 quickly. The alpha2 may differ from
* cfg80211_regdomain's alpha2 when an intersection has occurred.
* If the AP is reconfigured this can also be used to tell us if
* the country on the country IE changed. */
char country_ie_alpha2[2];
/* If a Country IE has been received this tells us the environment
* which its telling us its in. This defaults to ENVIRON_ANY */
enum environment_cap env;
/* wiphy index, internal only */
int wiphy_idx;
/* associate netdev list */
struct mutex devlist_mtx;
/* protected by devlist_mtx or RCU */
struct list_head netdev_list;
int devlist_generation;
int opencount; /* also protected by devlist_mtx */
wait_queue_head_t dev_wait;
/* BSSes/scanning */
spinlock_t bss_lock;
struct list_head bss_list;
struct rb_root bss_tree;
u32 bss_generation;
struct cfg80211_scan_request *scan_req; /* protected by RTNL */
struct cfg80211_sched_scan_request *sched_scan_req;
unsigned long suspend_at;
struct work_struct scan_done_wk;
struct work_struct sched_scan_results_wk;
struct mutex sched_scan_mtx;
#ifdef CONFIG_NL80211_TESTMODE
struct genl_info *testmode_info;
#endif
struct work_struct conn_work;
struct work_struct event_work;
struct cfg80211_wowlan *wowlan;
/* must be last because of the way we do wiphy_priv(),
* and it should at least be aligned to NETDEV_ALIGN */
struct wiphy wiphy __attribute__((__aligned__(NETDEV_ALIGN)));
};
static inline
struct cfg80211_registered_device *wiphy_to_dev(struct wiphy *wiphy)
{
BUG_ON(!wiphy);
return container_of(wiphy, struct cfg80211_registered_device, wiphy);
}
/* Note 0 is valid, hence phy0 */
static inline
bool wiphy_idx_valid(int wiphy_idx)
{
return wiphy_idx >= 0;
}
static inline void
cfg80211_rdev_free_wowlan(struct cfg80211_registered_device *rdev)
{
int i;
if (!rdev->wowlan)
return;
for (i = 0; i < rdev->wowlan->n_patterns; i++)
kfree(rdev->wowlan->patterns[i].mask);
kfree(rdev->wowlan->patterns);
kfree(rdev->wowlan);
}
extern struct workqueue_struct *cfg80211_wq;
extern struct mutex cfg80211_mutex;
extern struct list_head cfg80211_rdev_list;
extern int cfg80211_rdev_list_generation;
static inline void assert_cfg80211_lock(void)
{
lockdep_assert_held(&cfg80211_mutex);
}
/*
* You can use this to mark a wiphy_idx as not having an associated wiphy.
* It guarantees cfg80211_rdev_by_wiphy_idx(wiphy_idx) will return NULL
*/
#define WIPHY_IDX_STALE -1
struct cfg80211_internal_bss {
struct list_head list;
struct rb_node rbn;
unsigned long ts;
struct kref ref;
atomic_t hold;
bool beacon_ies_allocated;
bool proberesp_ies_allocated;
/* must be last because of priv member */
struct cfg80211_bss pub;
};
static inline struct cfg80211_internal_bss *bss_from_pub(struct cfg80211_bss *pub)
{
return container_of(pub, struct cfg80211_internal_bss, pub);
}
static inline void cfg80211_ref_bss(struct cfg80211_internal_bss *bss)
{
kref_get(&bss->ref);
}
static inline void cfg80211_hold_bss(struct cfg80211_internal_bss *bss)
{
atomic_inc(&bss->hold);
}
static inline void cfg80211_unhold_bss(struct cfg80211_internal_bss *bss)
{
int r = atomic_dec_return(&bss->hold);
WARN_ON(r < 0);
}
struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx);
int get_wiphy_idx(struct wiphy *wiphy);
struct cfg80211_registered_device *
__cfg80211_rdev_from_info(struct genl_info *info);
/*
* This function returns a pointer to the driver
* that the genl_info item that is passed refers to.
* If successful, it returns non-NULL and also locks
* the driver's mutex!
*
* This means that you need to call cfg80211_unlock_rdev()
* before being allowed to acquire &cfg80211_mutex!
*
* This is necessary because we need to lock the global
* mutex to get an item off the list safely, and then
* we lock the rdev mutex so it doesn't go away under us.
*
* We don't want to keep cfg80211_mutex locked
* for all the time in order to allow requests on
* other interfaces to go through at the same time.
*
* The result of this can be a PTR_ERR and hence must
* be checked with IS_ERR() for errors.
*/
extern struct cfg80211_registered_device *
cfg80211_get_dev_from_info(struct genl_info *info);
/* requires cfg80211_rdev_mutex to be held! */
struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx);
/* identical to cfg80211_get_dev_from_info but only operate on ifindex */
extern struct cfg80211_registered_device *
cfg80211_get_dev_from_ifindex(struct net *net, int ifindex);
int cfg80211_switch_netns(struct cfg80211_registered_device *rdev,
struct net *net);
static inline void cfg80211_lock_rdev(struct cfg80211_registered_device *rdev)
{
mutex_lock(&rdev->mtx);
}
static inline void cfg80211_unlock_rdev(struct cfg80211_registered_device *rdev)
{
BUG_ON(IS_ERR(rdev) || !rdev);
mutex_unlock(&rdev->mtx);
}
static inline void wdev_lock(struct wireless_dev *wdev)
__acquires(wdev)
{
mutex_lock(&wdev->mtx);
__acquire(wdev->mtx);
}
static inline void wdev_unlock(struct wireless_dev *wdev)
__releases(wdev)
{
__release(wdev->mtx);
mutex_unlock(&wdev->mtx);
}
#define ASSERT_RDEV_LOCK(rdev) lockdep_assert_held(&(rdev)->mtx)
#define ASSERT_WDEV_LOCK(wdev) lockdep_assert_held(&(wdev)->mtx)
enum cfg80211_event_type {
EVENT_CONNECT_RESULT,
EVENT_ROAMED,
EVENT_DISCONNECTED,
EVENT_IBSS_JOINED,
};
struct cfg80211_event {
struct list_head list;
enum cfg80211_event_type type;
union {
struct {
u8 bssid[ETH_ALEN];
const u8 *req_ie;
const u8 *resp_ie;
size_t req_ie_len;
size_t resp_ie_len;
u16 status;
} cr;
struct {
struct ieee80211_channel *channel;
u8 bssid[ETH_ALEN];
const u8 *req_ie;
const u8 *resp_ie;
size_t req_ie_len;
size_t resp_ie_len;
} rm;
struct {
const u8 *ie;
size_t ie_len;
u16 reason;
} dc;
struct {
u8 bssid[ETH_ALEN];
} ij;
};
};
struct cfg80211_cached_keys {
struct key_params params[6];
u8 data[6][WLAN_MAX_KEY_LEN];
int def, defmgmt;
};
/* free object */
extern void cfg80211_dev_free(struct cfg80211_registered_device *rdev);
extern int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
char *newname);
void ieee80211_set_bitrate_flags(struct wiphy *wiphy);
void cfg80211_bss_expire(struct cfg80211_registered_device *dev);
void cfg80211_bss_age(struct cfg80211_registered_device *dev,
unsigned long age_secs);
/* IBSS */
int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
struct net_device *dev,
struct cfg80211_ibss_params *params,
struct cfg80211_cached_keys *connkeys);
int cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
struct net_device *dev,
struct cfg80211_ibss_params *params,
struct cfg80211_cached_keys *connkeys);
void cfg80211_clear_ibss(struct net_device *dev, bool nowext);
int __cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
struct net_device *dev, bool nowext);
int cfg80211_leave_ibss(struct cfg80211_registered_device *rdev,
struct net_device *dev, bool nowext);
void __cfg80211_ibss_joined(struct net_device *dev, const u8 *bssid);
int cfg80211_ibss_wext_join(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev);
/* mesh */
extern const struct mesh_config default_mesh_config;
extern const struct mesh_setup default_mesh_setup;
int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
struct net_device *dev,
const struct mesh_setup *setup,
const struct mesh_config *conf);
int cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
struct net_device *dev,
const struct mesh_setup *setup,
const struct mesh_config *conf);
int cfg80211_leave_mesh(struct cfg80211_registered_device *rdev,
struct net_device *dev);
/* MLME */
int __cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
struct net_device *dev,
struct ieee80211_channel *chan,
enum nl80211_auth_type auth_type,
const u8 *bssid,
const u8 *ssid, int ssid_len,
const u8 *ie, int ie_len,
const u8 *key, int key_len, int key_idx,
bool local_state_change);
int cfg80211_mlme_auth(struct cfg80211_registered_device *rdev,
struct net_device *dev, struct ieee80211_channel *chan,
enum nl80211_auth_type auth_type, const u8 *bssid,
const u8 *ssid, int ssid_len,
const u8 *ie, int ie_len,
const u8 *key, int key_len, int key_idx,
bool local_state_change);
int __cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
struct net_device *dev,
struct ieee80211_channel *chan,
const u8 *bssid, const u8 *prev_bssid,
const u8 *ssid, int ssid_len,
const u8 *ie, int ie_len, bool use_mfp,
struct cfg80211_crypto_settings *crypt);
int cfg80211_mlme_assoc(struct cfg80211_registered_device *rdev,
struct net_device *dev, struct ieee80211_channel *chan,
const u8 *bssid, const u8 *prev_bssid,
const u8 *ssid, int ssid_len,
const u8 *ie, int ie_len, bool use_mfp,
struct cfg80211_crypto_settings *crypt);
int __cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
struct net_device *dev, const u8 *bssid,
const u8 *ie, int ie_len, u16 reason,
bool local_state_change);
int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
struct net_device *dev, const u8 *bssid,
const u8 *ie, int ie_len, u16 reason,
bool local_state_change);
int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
struct net_device *dev, const u8 *bssid,
const u8 *ie, int ie_len, u16 reason,
bool local_state_change);
void cfg80211_mlme_down(struct cfg80211_registered_device *rdev,
struct net_device *dev);
void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid,
const u8 *req_ie, size_t req_ie_len,
const u8 *resp_ie, size_t resp_ie_len,
u16 status, bool wextev,
struct cfg80211_bss *bss);
int cfg80211_mlme_register_mgmt(struct wireless_dev *wdev, u32 snd_pid,
u16 frame_type, const u8 *match_data,
int match_len);
void cfg80211_mlme_unregister_socket(struct wireless_dev *wdev, u32 nlpid);
void cfg80211_mlme_purge_registrations(struct wireless_dev *wdev);
int cfg80211_mlme_mgmt_tx(struct cfg80211_registered_device *rdev,
struct net_device *dev,
struct ieee80211_channel *chan, bool offchan,
enum nl80211_channel_type channel_type,
bool channel_type_valid, unsigned int wait,
const u8 *buf, size_t len, u64 *cookie);
/* SME */
int __cfg80211_connect(struct cfg80211_registered_device *rdev,
struct net_device *dev,
struct cfg80211_connect_params *connect,
struct cfg80211_cached_keys *connkeys,
const u8 *prev_bssid);
int cfg80211_connect(struct cfg80211_registered_device *rdev,
struct net_device *dev,
struct cfg80211_connect_params *connect,
struct cfg80211_cached_keys *connkeys);
int __cfg80211_disconnect(struct cfg80211_registered_device *rdev,
struct net_device *dev, u16 reason,
bool wextev);
int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
struct net_device *dev, u16 reason,
bool wextev);
void __cfg80211_roamed(struct wireless_dev *wdev,
struct ieee80211_channel *channel,
const u8 *bssid,
const u8 *req_ie, size_t req_ie_len,
const u8 *resp_ie, size_t resp_ie_len);
int cfg80211_mgd_wext_connect(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev);
void cfg80211_conn_work(struct work_struct *work);
void cfg80211_sme_failed_assoc(struct wireless_dev *wdev);
bool cfg80211_sme_failed_reassoc(struct wireless_dev *wdev);
/* internal helpers */
int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
struct key_params *params, int key_idx,
bool pairwise, const u8 *mac_addr);
void __cfg80211_disconnected(struct net_device *dev, const u8 *ie,
size_t ie_len, u16 reason, bool from_ap);
void cfg80211_sme_scan_done(struct net_device *dev);
void cfg80211_sme_rx_auth(struct net_device *dev, const u8 *buf, size_t len);
void cfg80211_sme_disassoc(struct net_device *dev, int idx);
void __cfg80211_scan_done(struct work_struct *wk);
void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak);
void __cfg80211_sched_scan_results(struct work_struct *wk);
int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
bool driver_initiated);
void cfg80211_upload_connect_keys(struct wireless_dev *wdev);
int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
struct net_device *dev, enum nl80211_iftype ntype,
u32 *flags, struct vif_params *params);
void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev);
int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
enum nl80211_iftype iftype);
static inline int
cfg80211_can_add_interface(struct cfg80211_registered_device *rdev,
enum nl80211_iftype iftype)
{
return cfg80211_can_change_interface(rdev, NULL, iftype);
}
struct ieee80211_channel *
rdev_freq_to_chan(struct cfg80211_registered_device *rdev,
int freq, enum nl80211_channel_type channel_type);
int cfg80211_set_freq(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev, int freq,
enum nl80211_channel_type channel_type);
u16 cfg80211_calculate_bitrate(struct rate_info *rate);
int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
const u8 *rates, unsigned int n_rates,
u32 *mask);
int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
u32 beacon_int);
#ifdef CONFIG_CFG80211_DEVELOPER_WARNINGS
#define CFG80211_DEV_WARN_ON(cond) WARN_ON(cond)
#else
/*
* Trick to enable using it as a condition,
* and also not give a warning when it's
* not used that way.
*/
#define CFG80211_DEV_WARN_ON(cond) ({bool __r = (cond); __r; })
#endif
#endif /* __NET_WIRELESS_CORE_H */
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