redonkable/alistair23-linux
redonkable/alistair23-linux
1
0
Fork 0
Code Releases Activity
alistair23-linux/net/wireless/core.h
Johannes Berg 59bbb6f757 cfg80211: validate channel settings across interfaces 
Currently, there's a problem that affects regulatory
enforcement and connection stability, in that it is
possible to switch the channel while connected to a
network or joined to an IBSS.

The problem comes from the fact that we only validate
the channel against the current interface's type, not
against any other interface. Thus, you have any type
of interface up, additionally bring up a monitor mode
interface and switch the channel on the monitor. This
will obviously also switch the channel on the other
interface.

The problem now is that if you do that while sending
beacons for IBSS mode, you can switch to a disabled
channel or a channel that doesn't allow beaconing.
Combined with a managed mode interface connected to
an AP instead of an IBSS interface, you can easily
break the connection that way.

To fix this, this patch validates any channel change
with all available interfaces, and disallows such
changes on secondary interfaces if another interface
is connected to an AP or joined to an IBSS.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-08-14 09:13:42 -04:00

376 lines
11 KiB
C
Raw Blame History

/*
* Wireless configuration interface internals.
*
* Copyright 2006-2009 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;
struct list_head netdev_list;
/* 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 */
unsigned long suspend_at;
struct work_struct scan_done_wk;
#ifdef CONFIG_NL80211_TESTMODE
struct genl_info *testmode_info;
#endif
struct work_struct conn_work;
struct work_struct event_work;
/* current channel */
struct ieee80211_channel *channel;
#ifdef CONFIG_CFG80211_DEBUGFS
/* Debugfs entries */
struct wiphy_debugfsdentries {
struct dentry *rts_threshold;
struct dentry *fragmentation_threshold;
struct dentry *short_retry_limit;
struct dentry *long_retry_limit;
struct dentry *ht40allow_map;
} debugfs;
#endif
/* 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);
}
extern struct mutex cfg80211_mutex;
extern struct list_head cfg80211_rdev_list;
#define assert_cfg80211_lock() WARN_ON(!mutex_is_locked(&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 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) WARN_ON(!mutex_is_locked(&(rdev)->mtx));
#define ASSERT_WDEV_LOCK(wdev) WARN_ON(!mutex_is_locked(&(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 {
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 wiphy_update_regulatory(struct wiphy *wiphy,
enum nl80211_reg_initiator setby);
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);
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);
/* 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);
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);
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);
int cfg80211_mlme_deauth(struct cfg80211_registered_device *rdev,
struct net_device *dev, const u8 *bssid,
const u8 *ie, int ie_len, u16 reason);
int cfg80211_mlme_disassoc(struct cfg80211_registered_device *rdev,
struct net_device *dev, const u8 *bssid,
const u8 *ie, int ie_len, u16 reason);
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);
/* SME */
int __cfg80211_connect(struct cfg80211_registered_device *rdev,
struct net_device *dev,
struct cfg80211_connect_params *connect,
struct cfg80211_cached_keys *connkeys);
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, 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);
/* internal helpers */
int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
struct key_params *params, int key_idx,
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_upload_connect_keys(struct wireless_dev *wdev);
struct ieee80211_channel *
rdev_fixed_channel(struct cfg80211_registered_device *rdev,
struct wireless_dev *for_wdev);
int rdev_set_freq(struct cfg80211_registered_device *rdev,
int freq, enum nl80211_channel_type channel_type);
#endif /* __NET_WIRELESS_CORE_H */
View git blame Copy permalink