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cfg80211/nl80211: scanning (and mac80211 update to use it)

Browse source 
This patch adds basic scan capability to cfg80211/nl80211 and
changes mac80211 to use it. The BSS list that cfg80211 maintains
is made driver-accessible with a private area in each BSS struct,
but mac80211 doesn't yet use it. That's another large project.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2009-02-10 21:25:55 +01:00 committed by John W. Linville
parent 849b796781
commit 2a51931192
21 changed files with 1546 additions and 383 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/net/wireless/iwlwifi/iwl-agn.c
View file

@ -2678,11 +2678,19 @@ static void iwl_bss_info_changed(struct ieee80211_hw *hw,
}
static int iwl_mac_hw_scan(struct ieee80211_hw *hw, u8 *ssid, size_t ssid_len)
static int iwl_mac_hw_scan(struct ieee80211_hw *hw,
struct cfg80211_scan_request *req)
{
unsigned long flags;
struct iwl_priv *priv = hw->priv;
int ret;
u8 *ssid = NULL;
size_t ssid_len = 0;
if (req->n_ssids) {
ssid = req->ssids[0].ssid;
ssid_len = req->ssids[0].ssid_len;
}
IWL_DEBUG_MAC80211(priv, "enter\n");
@ -2718,7 +2726,7 @@ static int iwl_mac_hw_scan(struct ieee80211_hw *hw, u8 *ssid, size_t ssid_len)
if (ssid_len) {
priv->one_direct_scan = 1;
priv->direct_ssid_len = min_t(u8, ssid_len, IW_ESSID_MAX_SIZE);
priv->direct_ssid_len = ssid_len;
memcpy(priv->direct_ssid, ssid, priv->direct_ssid_len);
} else {
priv->one_direct_scan = 0;

1
drivers/net/wireless/iwlwifi/iwl-core.c
View file

@ -1271,6 +1271,7 @@ int iwl_setup_mac(struct iwl_priv *priv)
BIT(NL80211_IFTYPE_ADHOC);
hw->wiphy->custom_regulatory = true;
hw->wiphy->max_scan_ssids = 1;
/* Default value; 4 EDCA QOS priorities */
hw->queues = 4;

2
drivers/net/wireless/iwlwifi/iwl-scan.c
View file

@ -860,7 +860,7 @@ void iwl_bg_scan_completed(struct work_struct *work)
if (test_bit(STATUS_EXIT_PENDING, &priv->status))
return;
ieee80211_scan_completed(priv->hw);
ieee80211_scan_completed(priv->hw, false);
/* Since setting the TXPOWER may have been deferred while
* performing the scan, fire one off */

17
drivers/net/wireless/iwlwifi/iwl3945-base.c
View file

@ -4442,15 +4442,23 @@ static void iwl3945_bss_info_changed(struct ieee80211_hw *hw,
}
static int iwl3945_mac_hw_scan(struct ieee80211_hw *hw, u8 *ssid, size_t len)
static int iwl3945_mac_hw_scan(struct ieee80211_hw *hw,
struct cfg80211_scan_request *req)
{
int rc = 0;
unsigned long flags;
struct iwl_priv *priv = hw->priv;
size_t len = 0;
u8 *ssid = NULL;
DECLARE_SSID_BUF(ssid_buf);
IWL_DEBUG_MAC80211(priv, "enter\n");
if (req->n_ssids) {
ssid = req->ssids[0].ssid;
len = req->ssids[0].ssid_len;
}
mutex_lock(&priv->mutex);
spin_lock_irqsave(&priv->lock, flags);
@ -4478,9 +4486,8 @@ static int iwl3945_mac_hw_scan(struct ieee80211_hw *hw, u8 *ssid, size_t len)
print_ssid(ssid_buf, ssid, len), len);
priv->one_direct_scan = 1;
priv->direct_ssid_len = (u8)
min((u8) len, (u8) IW_ESSID_MAX_SIZE);
memcpy(priv->direct_ssid, ssid, priv->direct_ssid_len);
priv->direct_ssid_len = len;
memcpy(priv->direct_ssid, ssid, len);
} else
priv->one_direct_scan = 0;
@ -5412,6 +5419,8 @@ static int iwl3945_pci_probe(struct pci_dev *pdev, const struct pci_device_id *e
hw->wiphy->custom_regulatory = true;
hw->wiphy->max_scan_ssids = 1;
/* 4 EDCA QOS priorities */
hw->queues = 4;

65
include/linux/nl80211.h
View file

@ -143,6 +143,13 @@
* added to all specified management frames generated by
* kernel/firmware/driver.
*
* @NL80211_CMD_GET_SCAN: get scan results
* @NL80211_CMD_TRIGGER_SCAN: trigger a new scan with the given parameters
* @NL80211_CMD_NEW_SCAN_RESULTS: scan notification (as a reply to
* NL80211_CMD_GET_SCAN and on the "scan" multicast group)
* @NL80211_CMD_SCAN_ABORTED: scan was aborted, for unspecified reasons,
* partial scan results may be available
*
* @NL80211_CMD_MAX: highest used command number
* @__NL80211_CMD_AFTER_LAST: internal use
*/
@ -192,6 +199,11 @@ enum nl80211_commands {
NL80211_CMD_GET_REG,
NL80211_CMD_GET_SCAN,
NL80211_CMD_TRIGGER_SCAN,
NL80211_CMD_NEW_SCAN_RESULTS,
NL80211_CMD_SCAN_ABORTED,
/* add new commands above here */
/* used to define NL80211_CMD_MAX below */
@ -305,6 +317,18 @@ enum nl80211_commands {
* @NL80211_ATTR_IE: Information element(s) data (used, e.g., with
* %NL80211_CMD_SET_MGMT_EXTRA_IE).
*
* @NL80211_ATTR_MAX_NUM_SCAN_SSIDS: number of SSIDs you can scan with
* a single scan request, a wiphy attribute.
*
* @NL80211_ATTR_SCAN_FREQUENCIES: nested attribute with frequencies (in MHz)
* @NL80211_ATTR_SCAN_SSIDS: nested attribute with SSIDs, leave out for passive
* scanning and include a zero-length SSID (wildcard) for wildcard scan
* @NL80211_ATTR_SCAN_GENERATION: the scan generation increases whenever the
* scan result list changes (BSS expired or added) so that applications
* can verify that they got a single, consistent snapshot (when all dump
* messages carried the same generation number)
* @NL80211_ATTR_BSS: scan result BSS
*
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
*/
@ -372,6 +396,13 @@ enum nl80211_attrs {
NL80211_ATTR_MGMT_SUBTYPE,
NL80211_ATTR_IE,
NL80211_ATTR_MAX_NUM_SCAN_SSIDS,
NL80211_ATTR_SCAN_FREQUENCIES,
NL80211_ATTR_SCAN_SSIDS,
NL80211_ATTR_SCAN_GENERATION,
NL80211_ATTR_BSS,
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
@ -841,4 +872,38 @@ enum nl80211_channel_type {
NL80211_CHAN_HT40MINUS,
NL80211_CHAN_HT40PLUS
};
/**
* enum nl80211_bss - netlink attributes for a BSS
*
* @__NL80211_BSS_INVALID: invalid
* @NL80211_BSS_FREQUENCY: frequency in MHz (u32)
* @NL80211_BSS_TSF: TSF of the received probe response/beacon (u64)
* @NL80211_BSS_BEACON_INTERVAL: beacon interval of the (I)BSS (u16)
* @NL80211_BSS_CAPABILITY: capability field (CPU order, u16)
* @NL80211_BSS_INFORMATION_ELEMENTS: binary attribute containing the
* raw information elements from the probe response/beacon (bin)
* @NL80211_BSS_SIGNAL_MBM: signal strength of probe response/beacon
* in mBm (100 * dBm) (s32)
* @NL80211_BSS_SIGNAL_UNSPEC: signal strength of the probe response/beacon
* in unspecified units, scaled to 0..100 (u8)
* @__NL80211_BSS_AFTER_LAST: internal
* @NL80211_BSS_MAX: highest BSS attribute
*/
enum nl80211_bss {
__NL80211_BSS_INVALID,
NL80211_BSS_BSSID,
NL80211_BSS_FREQUENCY,
NL80211_BSS_TSF,
NL80211_BSS_BEACON_INTERVAL,
NL80211_BSS_CAPABILITY,
NL80211_BSS_INFORMATION_ELEMENTS,
NL80211_BSS_SIGNAL_MBM,
NL80211_BSS_SIGNAL_UNSPEC,
/* keep last */
__NL80211_BSS_AFTER_LAST,
NL80211_BSS_MAX = __NL80211_BSS_AFTER_LAST - 1
};
#endif /* __LINUX_NL80211_H */

131
include/net/cfg80211.h
View file

@ -4,6 +4,10 @@
#include <linux/netlink.h>
#include <linux/skbuff.h>
#include <linux/nl80211.h>
#include <linux/if_ether.h>
#include <linux/ieee80211.h>
#include <linux/wireless.h>
#include <net/iw_handler.h>
#include <net/genetlink.h>
/* remove once we remove the wext stuff */
#include <net/iw_handler.h>
@ -504,6 +508,83 @@ struct wiphy;
/* from net/ieee80211.h */
struct ieee80211_channel;
/**
* struct cfg80211_ssid - SSID description
* @ssid: the SSID
* @ssid_len: length of the ssid
*/
struct cfg80211_ssid {
u8 ssid[IEEE80211_MAX_SSID_LEN];
u8 ssid_len;
};
/**
* struct cfg80211_scan_request - scan request description
*
* @ssids: SSIDs to scan for (active scan only)
* @n_ssids: number of SSIDs
* @channels: channels to scan on.
* @n_channels: number of channels for each band
* @wiphy: the wiphy this was for
* @ifidx: the interface index
*/
struct cfg80211_scan_request {
struct cfg80211_ssid *ssids;
int n_ssids;
struct ieee80211_channel **channels;
u32 n_channels;
/* internal */
struct wiphy *wiphy;
int ifidx;
};
/**
* enum cfg80211_signal_type - signal type
*
* @CFG80211_SIGNAL_TYPE_NONE: no signal strength information available
* @CFG80211_SIGNAL_TYPE_MBM: signal strength in mBm (100*dBm)
* @CFG80211_SIGNAL_TYPE_UNSPEC: signal strength, increasing from 0 through 100
*/
enum cfg80211_signal_type {
CFG80211_SIGNAL_TYPE_NONE,
CFG80211_SIGNAL_TYPE_MBM,
CFG80211_SIGNAL_TYPE_UNSPEC,
};
/**
* struct cfg80211_bss - BSS description
*
* This structure describes a BSS (which may also be a mesh network)
* for use in scan results and similar.
*
* @bssid: BSSID of the BSS
* @tsf: timestamp of last received update
* @beacon_interval: the beacon interval as from the frame
* @capability: the capability field in host byte order
* @information_elements: the information elements (Note that there
* is no guarantee that these are well-formed!)
* @len_information_elements: total length of the information elements
* @signal: signal strength value
* @signal_type: signal type
* @priv: private area for driver use, has at least wiphy->bss_priv_size bytes
*/
struct cfg80211_bss {
struct ieee80211_channel *channel;
u8 bssid[ETH_ALEN];
u64 tsf;
u16 beacon_interval;
u16 capability;
u8 *information_elements;
size_t len_information_elements;
s32 signal;
enum cfg80211_signal_type signal_type;
u8 priv[0] __attribute__((__aligned__(sizeof(void *))));
};
/**
* struct cfg80211_ops - backend description for wireless configuration
*
@ -571,6 +652,11 @@ struct ieee80211_channel;
* @set_channel: Set channel
*
* @set_mgmt_extra_ie: Set extra IE data for management frames
*
* @scan: Request to do a scan. If returning zero, the scan request is given
* the driver, and will be valid until passed to cfg80211_scan_done().
* For scan results, call cfg80211_inform_bss(); you can call this outside
* the scan/scan_done bracket too.
*/
struct cfg80211_ops {
int (*suspend)(struct wiphy *wiphy);
@ -648,6 +734,9 @@ struct cfg80211_ops {
int (*set_mgmt_extra_ie)(struct wiphy *wiphy,
struct net_device *dev,
struct mgmt_extra_ie_params *params);
int (*scan)(struct wiphy *wiphy, struct net_device *dev,
struct cfg80211_scan_request *request);
};
/* temporary wext handlers */
@ -658,5 +747,47 @@ int cfg80211_wext_siwmode(struct net_device *dev, struct iw_request_info *info,
u32 *mode, char *extra);
int cfg80211_wext_giwmode(struct net_device *dev, struct iw_request_info *info,
u32 *mode, char *extra);
int cfg80211_wext_siwscan(struct net_device *dev,
struct iw_request_info *info,
union iwreq_data *wrqu, char *extra);
int cfg80211_wext_giwscan(struct net_device *dev,
struct iw_request_info *info,
struct iw_point *data, char *extra);
/**
* cfg80211_scan_done - notify that scan finished
*
* @request: the corresponding scan request
* @aborted: set to true if the scan was aborted for any reason,
* userspace will be notified of that
*/
void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted);
/**
* cfg80211_inform_bss - inform cfg80211 of a new BSS
*
* @wiphy: the wiphy reporting the BSS
* @bss: the found BSS
* @gfp: context flags
*
* This informs cfg80211 that BSS information was found and
* the BSS should be updated/added.
*/
struct cfg80211_bss*
cfg80211_inform_bss_frame(struct wiphy *wiphy,
struct ieee80211_channel *channel,
struct ieee80211_mgmt *mgmt, size_t len,
s32 signal, enum cfg80211_signal_type sigtype,
gfp_t gfp);
struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
struct ieee80211_channel *channel,
const u8 *bssid,
const u8 *ssid, size_t ssid_len);
struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
struct ieee80211_channel *channel,
const u8 *meshid, size_t meshidlen,
const u8 *meshcfg);
void cfg80211_put_bss(struct cfg80211_bss *bss);
#endif /* __NET_CFG80211_H */

6
include/net/mac80211.h
View file

@ -1406,7 +1406,8 @@ struct ieee80211_ops {
void (*update_tkip_key)(struct ieee80211_hw *hw,
struct ieee80211_key_conf *conf, const u8 *address,
u32 iv32, u16 *phase1key);
int (*hw_scan)(struct ieee80211_hw *hw, u8 *ssid, size_t len);
int (*hw_scan)(struct ieee80211_hw *hw,
struct cfg80211_scan_request *req);
int (*get_stats)(struct ieee80211_hw *hw,
struct ieee80211_low_level_stats *stats);
void (*get_tkip_seq)(struct ieee80211_hw *hw, u8 hw_key_idx,
@ -1844,8 +1845,9 @@ void ieee80211_wake_queues(struct ieee80211_hw *hw);
* mac80211 that the scan finished.
*
* @hw: the hardware that finished the scan
* @aborted: set to true if scan was aborted
*/
void ieee80211_scan_completed(struct ieee80211_hw *hw);
void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted);
/**
* ieee80211_iterate_active_interfaces - iterate active interfaces

3
include/net/wireless.h
View file

@ -213,6 +213,9 @@ struct wiphy {
bool custom_regulatory;
bool strict_regulatory;
int bss_priv_size;
u8 max_scan_ssids;
/* If multiple wiphys are registered and you're handed e.g.
* a regular netdev with assigned ieee80211_ptr, you won't
* know whether it points to a wiphy your driver has registered

20
net/mac80211/cfg.c
View file

@ -1277,6 +1277,25 @@ static int ieee80211_resume(struct wiphy *wiphy)
#define ieee80211_resume NULL
#endif
static int ieee80211_scan(struct wiphy *wiphy,
struct net_device *dev,
struct cfg80211_scan_request *req)
{
struct ieee80211_sub_if_data *sdata;
if (!netif_running(dev))
return -ENETDOWN;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
if (sdata->vif.type != NL80211_IFTYPE_STATION &&
sdata->vif.type != NL80211_IFTYPE_ADHOC &&
sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
return -EOPNOTSUPP;
return ieee80211_request_scan(sdata, req);
}
struct cfg80211_ops mac80211_config_ops = {
.add_virtual_intf = ieee80211_add_iface,
.del_virtual_intf = ieee80211_del_iface,
@ -1309,4 +1328,5 @@ struct cfg80211_ops mac80211_config_ops = {
.set_mgmt_extra_ie = ieee80211_set_mgmt_extra_ie,
.suspend = ieee80211_suspend,
.resume = ieee80211_resume,
.scan = ieee80211_scan,
};

18
net/mac80211/ieee80211_i.h
View file

@ -294,8 +294,6 @@ struct ieee80211_if_sta {
u8 ssid[IEEE80211_MAX_SSID_LEN];
enum ieee80211_sta_mlme_state state;
size_t ssid_len;
u8 scan_ssid[IEEE80211_MAX_SSID_LEN];
size_t scan_ssid_len;
u16 aid;
u16 ap_capab, capab;
u8 *extra_ie; /* to be added to the end of AssocReq */
@ -658,17 +656,18 @@ struct ieee80211_local {
/* Scanning and BSS list */
bool sw_scanning, hw_scanning;
struct cfg80211_ssid scan_ssid;
struct cfg80211_scan_request int_scan_req;
struct cfg80211_scan_request *scan_req;
struct ieee80211_channel *scan_channel;
int scan_channel_idx;
enum ieee80211_band scan_band;
enum { SCAN_SET_CHANNEL, SCAN_SEND_PROBE } scan_state;
unsigned long last_scan_completed;
struct delayed_work scan_work;
struct ieee80211_sub_if_data *scan_sdata;
struct ieee80211_channel *oper_channel, *scan_channel, *csa_channel;
enum nl80211_channel_type oper_channel_type;
u8 scan_ssid[IEEE80211_MAX_SSID_LEN];
size_t scan_ssid_len;
struct ieee80211_channel *oper_channel, *csa_channel;
struct list_head bss_list;
struct ieee80211_bss *bss_hash[STA_HASH_SIZE];
spinlock_t bss_lock;
@ -929,7 +928,7 @@ void ieee80211_send_pspoll(struct ieee80211_local *local,
/* scan/BSS handling */
int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
u8 *ssid, size_t ssid_len);
struct cfg80211_scan_request *req);
int ieee80211_scan_results(struct ieee80211_local *local,
struct iw_request_info *info,
char *buf, size_t len);
@ -944,14 +943,15 @@ int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata,
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local);
int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata,
u8 *ssid, size_t ssid_len);
struct cfg80211_scan_request *req);
struct ieee80211_bss *
ieee80211_bss_info_update(struct ieee80211_local *local,
struct ieee80211_rx_status *rx_status,
struct ieee80211_mgmt *mgmt,
size_t len,
struct ieee802_11_elems *elems,
int freq, bool beacon);
struct ieee80211_channel *channel,
bool beacon);
struct ieee80211_bss *
ieee80211_rx_bss_add(struct ieee80211_local *local, u8 *bssid, int freq,
u8 *ssid, u8 ssid_len);

2
net/mac80211/iface.c
View file

@ -522,7 +522,7 @@ static int ieee80211_stop(struct net_device *dev)
* scan event to userspace -- the scan is incomplete.
*/
if (local->sw_scanning)
ieee80211_scan_completed(&local->hw);
ieee80211_scan_completed(&local->hw, true);
}
conf.vif = &sdata->vif;

32
net/mac80211/main.c
View file

@ -733,6 +733,7 @@ struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
return NULL;
wiphy->privid = mac80211_wiphy_privid;
wiphy->max_scan_ssids = 4;
local = wiphy_priv(wiphy);
local->hw.wiphy = wiphy;
@ -817,25 +818,33 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
enum ieee80211_band band;
struct net_device *mdev;
struct ieee80211_master_priv *mpriv;
int channels, i, j;
/*
* generic code guarantees at least one band,
* set this very early because much code assumes
* that hw.conf.channel is assigned
*/
channels = 0;
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
struct ieee80211_supported_band *sband;
sband = local->hw.wiphy->bands[band];
if (sband) {
if (sband && !local->oper_channel) {
/* init channel we're on */
local->hw.conf.channel =
local->oper_channel =
local->scan_channel = &sband->channels[0];
break;
}
if (sband)
channels += sband->n_channels;
}
local->int_scan_req.n_channels = channels;
local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
if (!local->int_scan_req.channels)
return -ENOMEM;
/* if low-level driver supports AP, we also support VLAN */
if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
@ -845,7 +854,7 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
result = wiphy_register(local->hw.wiphy);
if (result < 0)
return result;
goto fail_wiphy_register;
/*
* We use the number of queues for feature tests (QoS, HT) internally
@ -948,6 +957,20 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
ieee80211_led_init(local);
/* alloc internal scan request */
i = 0;
local->int_scan_req.ssids = &local->scan_ssid;
local->int_scan_req.n_ssids = 1;
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
if (!hw->wiphy->bands[band])
continue;
for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
local->int_scan_req.channels[i] =
&hw->wiphy->bands[band]->channels[j];
i++;
}
}
return 0;
fail_wep:
@ -966,6 +989,8 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
free_netdev(local->mdev);
fail_mdev_alloc:
wiphy_unregister(local->hw.wiphy);
fail_wiphy_register:
kfree(local->int_scan_req.channels);
return result;
}
EXPORT_SYMBOL(ieee80211_register_hw);
@ -1011,6 +1036,7 @@ void ieee80211_unregister_hw(struct ieee80211_hw *hw)
ieee80211_wep_free(local);
ieee80211_led_exit(local);
free_netdev(local->mdev);
kfree(local->int_scan_req.channels);
}
EXPORT_SYMBOL(ieee80211_unregister_hw);

37
net/mac80211/mlme.c
View file

@ -1743,7 +1743,7 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
}
bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
freq, beacon);
channel, beacon);
if (!bss)
return;
@ -2162,7 +2162,15 @@ static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
"IBSS networks with same SSID (merge)\n", sdata->dev->name);
ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
/* XXX maybe racy? */
if (sdata->local->scan_req)
return;
memcpy(sdata->local->int_scan_req.ssids[0].ssid,
ifsta->ssid, IEEE80211_MAX_SSID_LEN);
sdata->local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
ieee80211_request_scan(sdata, &sdata->local->int_scan_req);
}
@ -2378,8 +2386,15 @@ static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
IEEE80211_SCAN_INTERVAL)) {
printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
"join\n", sdata->dev->name);
return ieee80211_request_scan(sdata, ifsta->ssid,
ifsta->ssid_len);
/* XXX maybe racy? */
if (local->scan_req)
return -EBUSY;
memcpy(local->int_scan_req.ssids[0].ssid,
ifsta->ssid, IEEE80211_MAX_SSID_LEN);
local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
return ieee80211_request_scan(sdata, &local->int_scan_req);
} else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
int interval = IEEE80211_SCAN_INTERVAL;
@ -2478,11 +2493,16 @@ static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
} else {
if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
ifsta->assoc_scan_tries++;
/* XXX maybe racy? */
if (local->scan_req)
return -1;
memcpy(local->int_scan_req.ssids[0].ssid,
ifsta->ssid, IEEE80211_MAX_SSID_LEN);
if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
ieee80211_start_scan(sdata, NULL, 0);
local->int_scan_req.ssids[0].ssid_len = 0;
else
ieee80211_start_scan(sdata, ifsta->ssid,
ifsta->ssid_len);
local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
ieee80211_start_scan(sdata, &local->int_scan_req);
ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
} else {
@ -2520,8 +2540,7 @@ static void ieee80211_sta_work(struct work_struct *work)
ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
ieee80211_start_scan(sdata, ifsta->scan_ssid,
ifsta->scan_ssid_len);
ieee80211_start_scan(sdata, local->scan_req);
return;
}

356
net/mac80211/scan.c
View file

@ -13,6 +13,9 @@
*/
/* TODO:
* figure out how to avoid that the "current BSS" expires
* clean up IBSS code (in MLME), see why it adds a BSS to the list
* use cfg80211's BSS handling (depends on IBSS TODO above)
* order BSS list by RSSI(?) ("quality of AP")
* scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
* SSID)
@ -225,10 +228,26 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
struct ieee80211_mgmt *mgmt,
size_t len,
struct ieee802_11_elems *elems,
int freq, bool beacon)
struct ieee80211_channel *channel,
bool beacon)
{
struct ieee80211_bss *bss;
int clen;
int clen, freq = channel->center_freq;
enum cfg80211_signal_type sigtype = CFG80211_SIGNAL_TYPE_NONE;
s32 signal = 0;
if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
sigtype = CFG80211_SIGNAL_TYPE_MBM;
signal = rx_status->signal * 100;
} else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) {
sigtype = CFG80211_SIGNAL_TYPE_UNSPEC;
signal = (rx_status->signal * 100) / local->hw.max_signal;
}
cfg80211_put_bss(
cfg80211_inform_bss_frame(local->hw.wiphy, channel,
mgmt, len, signal, sigtype,
GFP_ATOMIC));
#ifdef CONFIG_MAC80211_MESH
if (elems->mesh_config)
@ -401,7 +420,7 @@ ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
bss = ieee80211_bss_info_update(sdata->local, rx_status,
mgmt, skb->len, &elems,
freq, beacon);
channel, beacon);
if (bss)
ieee80211_rx_bss_put(sdata->local, bss);
@ -439,26 +458,22 @@ void ieee80211_send_nullfunc(struct ieee80211_local *local,
ieee80211_tx_skb(sdata, skb, 0);
}
void ieee80211_scan_completed(struct ieee80211_hw *hw)
void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_sub_if_data *sdata;
union iwreq_data wrqu;
if (WARN_ON(!local->hw_scanning && !local->sw_scanning))
return;
local->last_scan_completed = jiffies;
memset(&wrqu, 0, sizeof(wrqu));
if (WARN_ON(!local->scan_req))
return;
/*
* local->scan_sdata could have been NULLed by the interface
* down code in case we were scanning on an interface that is
* being taken down.
*/
sdata = local->scan_sdata;
if (sdata)
wireless_send_event(sdata->dev, SIOCGIWSCAN, &wrqu, NULL);
if (local->scan_req != &local->int_scan_req)
cfg80211_scan_done(local->scan_req, aborted);
local->scan_req = NULL;
local->last_scan_completed = jiffies;
if (local->hw_scanning) {
local->hw_scanning = false;
@ -520,9 +535,8 @@ void ieee80211_scan_work(struct work_struct *work)
struct ieee80211_local *local =
container_of(work, struct ieee80211_local, scan_work.work);
struct ieee80211_sub_if_data *sdata = local->scan_sdata;
struct ieee80211_supported_band *sband;
struct ieee80211_channel *chan;
int skip;
int skip, i;
unsigned long next_delay = 0;
/*
@ -533,33 +547,13 @@ void ieee80211_scan_work(struct work_struct *work)
switch (local->scan_state) {
case SCAN_SET_CHANNEL:
/*
* Get current scan band. scan_band may be IEEE80211_NUM_BANDS
* after we successfully scanned the last channel of the last
* band (and the last band is supported by the hw)
*/
if (local->scan_band < IEEE80211_NUM_BANDS)
sband = local->hw.wiphy->bands[local->scan_band];
else
sband = NULL;
/*
* If we are at an unsupported band and have more bands
* left to scan, advance to the next supported one.
*/
while (!sband && local->scan_band < IEEE80211_NUM_BANDS - 1) {
local->scan_band++;
sband = local->hw.wiphy->bands[local->scan_band];
local->scan_channel_idx = 0;
}
/* if no more bands/channels left, complete scan */
if (!sband || local->scan_channel_idx >= sband->n_channels) {
ieee80211_scan_completed(local_to_hw(local));
if (local->scan_channel_idx >= local->scan_req->n_channels) {
ieee80211_scan_completed(local_to_hw(local), false);
return;
}
skip = 0;
chan = &sband->channels[local->scan_channel_idx];
chan = local->scan_req->channels[local->scan_channel_idx];
if (chan->flags & IEEE80211_CHAN_DISABLED ||
(sdata->vif.type == NL80211_IFTYPE_ADHOC &&
@ -575,15 +569,6 @@ void ieee80211_scan_work(struct work_struct *work)
/* advance state machine to next channel/band */
local->scan_channel_idx++;
if (local->scan_channel_idx >= sband->n_channels) {
/*
* scan_band may end up == IEEE80211_NUM_BANDS, but
* we'll catch that case above and complete the scan
* if that is the case.
*/
local->scan_band++;
local->scan_channel_idx = 0;
}
if (skip)
break;
@ -596,10 +581,14 @@ void ieee80211_scan_work(struct work_struct *work)
next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
local->scan_state = SCAN_SET_CHANNEL;
if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN ||
!local->scan_req->n_ssids)
break;
ieee80211_send_probe_req(sdata, NULL, local->scan_ssid,
local->scan_ssid_len);
for (i = 0; i < local->scan_req->n_ssids; i++)
ieee80211_send_probe_req(
sdata, NULL,
local->scan_req->ssids[i].ssid,
local->scan_req->ssids[i].ssid_len);
next_delay = IEEE80211_CHANNEL_TIME;
break;
}
@ -610,14 +599,19 @@ void ieee80211_scan_work(struct work_struct *work)
int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata,
u8 *ssid, size_t ssid_len)
struct cfg80211_scan_request *req)
{
struct ieee80211_local *local = scan_sdata->local;
struct ieee80211_sub_if_data *sdata;
if (ssid_len > IEEE80211_MAX_SSID_LEN)
if (!req)
return -EINVAL;
if (local->scan_req && local->scan_req != req)
return -EBUSY;
local->scan_req = req;
/* MLME-SCAN.request (page 118) page 144 (11.1.3.1)
* BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
* BSSID: MACAddress
@ -645,7 +639,7 @@ int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata,
int rc;
local->hw_scanning = true;
rc = local->ops->hw_scan(local_to_hw(local), ssid, ssid_len);
rc = local->ops->hw_scan(local_to_hw(local), req);
if (rc) {
local->hw_scanning = false;
return rc;
@ -678,15 +672,10 @@ int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata,
}
mutex_unlock(&local->iflist_mtx);
if (ssid) {
local->scan_ssid_len = ssid_len;
memcpy(local->scan_ssid, ssid, ssid_len);
} else
local->scan_ssid_len = 0;
local->scan_state = SCAN_SET_CHANNEL;
local->scan_channel_idx = 0;
local->scan_band = IEEE80211_BAND_2GHZ;
local->scan_sdata = scan_sdata;
local->scan_req = req;
netif_addr_lock_bh(local->mdev);
local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
@ -706,13 +695,21 @@ int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata,
int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
u8 *ssid, size_t ssid_len)
struct cfg80211_scan_request *req)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_sta *ifsta;
if (!req)
return -EINVAL;
if (local->scan_req && local->scan_req != req)
return -EBUSY;
local->scan_req = req;
if (sdata->vif.type != NL80211_IFTYPE_STATION)
return ieee80211_start_scan(sdata, ssid, ssid_len);
return ieee80211_start_scan(sdata, req);
/*
* STA has a state machine that might need to defer scanning
@ -727,241 +724,8 @@ int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
}
ifsta = &sdata->u.sta;
ifsta->scan_ssid_len = ssid_len;
if (ssid_len)
memcpy(ifsta->scan_ssid, ssid, ssid_len);
set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
queue_work(local->hw.workqueue, &ifsta->work);
return 0;
}
static void ieee80211_scan_add_ies(struct iw_request_info *info,
struct ieee80211_bss *bss,
char **current_ev, char *end_buf)
{
u8 *pos, *end, *next;
struct iw_event iwe;
if (bss == NULL || bss->ies == NULL)
return;
/*
* If needed, fragment the IEs buffer (at IE boundaries) into short
* enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
*/
pos = bss->ies;
end = pos + bss->ies_len;
while (end - pos > IW_GENERIC_IE_MAX) {
next = pos + 2 + pos[1];
while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
next = next + 2 + next[1];
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVGENIE;
iwe.u.data.length = next - pos;
*current_ev = iwe_stream_add_point(info, *current_ev,
end_buf, &iwe, pos);
pos = next;
}
if (end > pos) {
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVGENIE;
iwe.u.data.length = end - pos;
*current_ev = iwe_stream_add_point(info, *current_ev,
end_buf, &iwe, pos);
}
}
static char *
ieee80211_scan_result(struct ieee80211_local *local,
struct iw_request_info *info,
struct ieee80211_bss *bss,
char *current_ev, char *end_buf)
{
struct iw_event iwe;
char *buf;
if (time_after(jiffies,
bss->last_update + IEEE80211_SCAN_RESULT_EXPIRE))
return current_ev;
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWAP;
iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
memcpy(iwe.u.ap_addr.sa_data, bss->bssid, ETH_ALEN);
current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
IW_EV_ADDR_LEN);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWESSID;
if (bss_mesh_cfg(bss)) {
iwe.u.data.length = bss_mesh_id_len(bss);
iwe.u.data.flags = 1;
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
&iwe, bss_mesh_id(bss));
} else {
iwe.u.data.length = bss->ssid_len;
iwe.u.data.flags = 1;
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
&iwe, bss->ssid);
}
if (bss->capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
|| bss_mesh_cfg(bss)) {
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWMODE;
if (bss_mesh_cfg(bss))
iwe.u.mode = IW_MODE_MESH;
else if (bss->capability & WLAN_CAPABILITY_ESS)
iwe.u.mode = IW_MODE_MASTER;
else
iwe.u.mode = IW_MODE_ADHOC;
current_ev = iwe_stream_add_event(info, current_ev, end_buf,
&iwe, IW_EV_UINT_LEN);
}
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWFREQ;
iwe.u.freq.m = ieee80211_frequency_to_channel(bss->freq);
iwe.u.freq.e = 0;
current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
IW_EV_FREQ_LEN);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWFREQ;
iwe.u.freq.m = bss->freq;
iwe.u.freq.e = 6;
current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
IW_EV_FREQ_LEN);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVQUAL;
iwe.u.qual.qual = bss->qual;
iwe.u.qual.level = bss->signal;
iwe.u.qual.noise = bss->noise;
iwe.u.qual.updated = local->wstats_flags;
current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
IW_EV_QUAL_LEN);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWENCODE;
if (bss->capability & WLAN_CAPABILITY_PRIVACY)
iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
else
iwe.u.data.flags = IW_ENCODE_DISABLED;
iwe.u.data.length = 0;
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
&iwe, "");
ieee80211_scan_add_ies(info, bss, &current_ev, end_buf);
if (bss->supp_rates_len > 0) {
/* display all supported rates in readable format */
char *p = current_ev + iwe_stream_lcp_len(info);
int i;
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWRATE;
/* Those two flags are ignored... */
iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
for (i = 0; i < bss->supp_rates_len; i++) {
iwe.u.bitrate.value = ((bss->supp_rates[i] &
0x7f) * 500000);
p = iwe_stream_add_value(info, current_ev, p,
end_buf, &iwe, IW_EV_PARAM_LEN);
}
current_ev = p;
}
buf = kmalloc(30, GFP_ATOMIC);
if (buf) {
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->timestamp));
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
&iwe, buf);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
sprintf(buf, " Last beacon: %dms ago",
jiffies_to_msecs(jiffies - bss->last_update));
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev,
end_buf, &iwe, buf);
kfree(buf);
}
if (bss_mesh_cfg(bss)) {
u8 *cfg = bss_mesh_cfg(bss);
buf = kmalloc(50, GFP_ATOMIC);
if (buf) {
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
sprintf(buf, "Mesh network (version %d)", cfg[0]);
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev,
end_buf,
&iwe, buf);
sprintf(buf, "Path Selection Protocol ID: "
"0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
cfg[4]);
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev,
end_buf,
&iwe, buf);
sprintf(buf, "Path Selection Metric ID: "
"0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
cfg[8]);
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev,
end_buf,
&iwe, buf);
sprintf(buf, "Congestion Control Mode ID: "
"0x%02X%02X%02X%02X", cfg[9], cfg[10],
cfg[11], cfg[12]);
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev,
end_buf,
&iwe, buf);
sprintf(buf, "Channel Precedence: "
"0x%02X%02X%02X%02X", cfg[13], cfg[14],
cfg[15], cfg[16]);
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev,
end_buf,
&iwe, buf);
kfree(buf);
}
}
return current_ev;
}
int ieee80211_scan_results(struct ieee80211_local *local,
struct iw_request_info *info,
char *buf, size_t len)
{
char *current_ev = buf;
char *end_buf = buf + len;
struct ieee80211_bss *bss;
spin_lock_bh(&local->bss_lock);
list_for_each_entry(bss, &local->bss_list, list) {
if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
spin_unlock_bh(&local->bss_lock);
return -E2BIG;
}
current_ev = ieee80211_scan_result(local, info, bss,
current_ev, end_buf);
}
spin_unlock_bh(&local->bss_lock);
return current_ev - buf;
}

59
net/mac80211/wext.c
View file

@ -173,8 +173,9 @@ static int ieee80211_ioctl_giwrange(struct net_device *dev,
range->num_encoding_sizes = 2;
range->max_encoding_tokens = NUM_DEFAULT_KEYS;
/* cfg80211 requires this, and enforces 0..100 */
if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
range->max_qual.level = local->hw.max_signal;
range->max_qual.level = 100;
else if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
range->max_qual.level = -110;
else
@ -415,58 +416,6 @@ static int ieee80211_ioctl_giwap(struct net_device *dev,
}
static int ieee80211_ioctl_siwscan(struct net_device *dev,
struct iw_request_info *info,
union iwreq_data *wrqu, char *extra)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct iw_scan_req *req = NULL;
u8 *ssid = NULL;
size_t ssid_len = 0;
if (!netif_running(dev))
return -ENETDOWN;
if (sdata->vif.type != NL80211_IFTYPE_STATION &&
sdata->vif.type != NL80211_IFTYPE_ADHOC &&
sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
return -EOPNOTSUPP;
/* if SSID was specified explicitly then use that */
if (wrqu->data.length == sizeof(struct iw_scan_req) &&
wrqu->data.flags & IW_SCAN_THIS_ESSID) {
req = (struct iw_scan_req *)extra;
ssid = req->essid;
ssid_len = req->essid_len;
}
return ieee80211_request_scan(sdata, ssid, ssid_len);
}
static int ieee80211_ioctl_giwscan(struct net_device *dev,
struct iw_request_info *info,
struct iw_point *data, char *extra)
{
int res;
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sub_if_data *sdata;
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
if (local->sw_scanning || local->hw_scanning)
return -EAGAIN;
res = ieee80211_scan_results(local, info, extra, data->length);
if (res >= 0) {
data->length = res;
return 0;
}
data->length = 0;
return res;
}
static int ieee80211_ioctl_siwrate(struct net_device *dev,
struct iw_request_info *info,
struct iw_param *rate, char *extra)
@ -1165,8 +1114,8 @@ static const iw_handler ieee80211_handler[] =
(iw_handler) ieee80211_ioctl_giwap, /* SIOCGIWAP */
(iw_handler) ieee80211_ioctl_siwmlme, /* SIOCSIWMLME */
(iw_handler) NULL, /* SIOCGIWAPLIST */
(iw_handler) ieee80211_ioctl_siwscan, /* SIOCSIWSCAN */
(iw_handler) ieee80211_ioctl_giwscan, /* SIOCGIWSCAN */
(iw_handler) cfg80211_wext_siwscan, /* SIOCSIWSCAN */
(iw_handler) cfg80211_wext_giwscan, /* SIOCGIWSCAN */
(iw_handler) ieee80211_ioctl_siwessid, /* SIOCSIWESSID */
(iw_handler) ieee80211_ioctl_giwessid, /* SIOCGIWESSID */
(iw_handler) NULL, /* SIOCSIWNICKN */

2
net/wireless/Makefile
View file

@ -5,7 +5,7 @@ obj-$(CONFIG_LIB80211_CRYPT_WEP) += lib80211_crypt_wep.o
obj-$(CONFIG_LIB80211_CRYPT_CCMP) += lib80211_crypt_ccmp.o
obj-$(CONFIG_LIB80211_CRYPT_TKIP) += lib80211_crypt_tkip.o
cfg80211-y += core.o sysfs.o radiotap.o util.o reg.o
cfg80211-y += core.o sysfs.o radiotap.o util.o reg.o scan.o
cfg80211-$(CONFIG_WIRELESS_EXT) += wext-compat.o
cfg80211-$(CONFIG_NL80211) += nl80211.o

8
net/wireless/core.c
View file

@ -240,6 +240,8 @@ struct wiphy *wiphy_new(struct cfg80211_ops *ops, int sizeof_priv)
mutex_init(&drv->mtx);
mutex_init(&drv->devlist_mtx);
INIT_LIST_HEAD(&drv->netdev_list);
spin_lock_init(&drv->bss_lock);
INIT_LIST_HEAD(&drv->bss_list);
device_initialize(&drv->wiphy.dev);
drv->wiphy.dev.class = &ieee80211_class;
@ -259,6 +261,9 @@ int wiphy_register(struct wiphy *wiphy)
int i;
u16 ifmodes = wiphy->interface_modes;
if (WARN_ON(wiphy->max_scan_ssids < 1))
return -EINVAL;
/* sanity check ifmodes */
WARN_ON(!ifmodes);
ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;
@ -367,8 +372,11 @@ EXPORT_SYMBOL(wiphy_unregister);
void cfg80211_dev_free(struct cfg80211_registered_device *drv)
{
struct cfg80211_internal_bss *scan, *tmp;
mutex_destroy(&drv->mtx);
mutex_destroy(&drv->devlist_mtx);
list_for_each_entry_safe(scan, tmp, &drv->bss_list, list)
kfree(scan);
kfree(drv);
}

20
net/wireless/core.h
View file

@ -8,6 +8,8 @@
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/kref.h>
#include <linux/rbtree.h>
#include <net/genetlink.h>
#include <net/wireless.h>
#include <net/cfg80211.h>
@ -41,6 +43,13 @@ struct cfg80211_registered_device {
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 */
/* 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)));
@ -56,6 +65,15 @@ struct cfg80211_registered_device *wiphy_to_dev(struct wiphy *wiphy)
extern struct mutex cfg80211_drv_mutex;
extern struct list_head cfg80211_drv_list;
struct cfg80211_internal_bss {
struct list_head list;
struct rb_node rbn;
unsigned long ts;
struct kref ref;
/* must be last because of priv member */
struct cfg80211_bss pub;
};
/*
* This function returns a pointer to the driver
* that the genl_info item that is passed refers to.
@ -94,4 +112,6 @@ extern int cfg80211_dev_rename(struct cfg80211_registered_device *drv,
void ieee80211_set_bitrate_flags(struct wiphy *wiphy);
void wiphy_update_regulatory(struct wiphy *wiphy, enum reg_set_by setby);
void cfg80211_bss_expire(struct cfg80211_registered_device *dev);
#endif /* __NET_WIRELESS_CORE_H */

323
net/wireless/nl80211.c
View file

@ -14,6 +14,7 @@
#include <linux/nl80211.h>
#include <linux/rtnetlink.h>
#include <linux/netlink.h>
#include <linux/etherdevice.h>
#include <net/genetlink.h>
#include <net/cfg80211.h>
#include "core.h"
@ -109,6 +110,8 @@ static struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] __read_mostly = {
[NL80211_ATTR_MGMT_SUBTYPE] = { .type = NLA_U8 },
[NL80211_ATTR_IE] = { .type = NLA_BINARY,
.len = IEEE80211_MAX_DATA_LEN },
[NL80211_ATTR_SCAN_FREQUENCIES] = { .type = NLA_NESTED },
[NL80211_ATTR_SCAN_SSIDS] = { .type = NLA_NESTED },
};
/* message building helper */
@ -141,6 +144,8 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, dev->idx);
NLA_PUT_STRING(msg, NL80211_ATTR_WIPHY_NAME, wiphy_name(&dev->wiphy));
NLA_PUT_U8(msg, NL80211_ATTR_MAX_NUM_SCAN_SSIDS,
dev->wiphy.max_scan_ssids);
nl_modes = nla_nest_start(msg, NL80211_ATTR_SUPPORTED_IFTYPES);
if (!nl_modes)
@ -2270,6 +2275,246 @@ static int nl80211_set_mgmt_extra_ie(struct sk_buff *skb,
return err;
}
static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
{
struct cfg80211_registered_device *drv;
struct net_device *dev;
struct cfg80211_scan_request *request;
struct cfg80211_ssid *ssid;
struct ieee80211_channel *channel;
struct nlattr *attr;
struct wiphy *wiphy;
int err, tmp, n_ssids = 0, n_channels = 0, i;
enum ieee80211_band band;
err = get_drv_dev_by_info_ifindex(info->attrs, &drv, &dev);
if (err)
return err;
wiphy = &drv->wiphy;
if (!drv->ops->scan) {
err = -EOPNOTSUPP;
goto out;
}
rtnl_lock();
if (drv->scan_req) {
err = -EBUSY;
goto out_unlock;
}
if (info->attrs[NL80211_ATTR_SCAN_FREQUENCIES]) {
nla_for_each_nested(attr, info->attrs[NL80211_ATTR_SCAN_FREQUENCIES], tmp)
n_channels++;
if (!n_channels) {
err = -EINVAL;
goto out_unlock;
}
} else {
for (band = 0; band < IEEE80211_NUM_BANDS; band++)
if (wiphy->bands[band])
n_channels += wiphy->bands[band]->n_channels;
}
if (info->attrs[NL80211_ATTR_SCAN_SSIDS])
nla_for_each_nested(attr, info->attrs[NL80211_ATTR_SCAN_SSIDS], tmp)
n_ssids++;
if (n_ssids > wiphy->max_scan_ssids) {
err = -EINVAL;
goto out_unlock;
}
request = kzalloc(sizeof(*request)
+ sizeof(*ssid) * n_ssids
+ sizeof(channel) * n_channels, GFP_KERNEL);
if (!request) {
err = -ENOMEM;
goto out_unlock;
}
request->channels = (void *)((char *)request + sizeof(*request));
request->n_channels = n_channels;
if (n_ssids)
request->ssids = (void *)(request->channels + n_channels);
request->n_ssids = n_ssids;
if (info->attrs[NL80211_ATTR_SCAN_FREQUENCIES]) {
/* user specified, bail out if channel not found */
request->n_channels = n_channels;
i = 0;
nla_for_each_nested(attr, info->attrs[NL80211_ATTR_SCAN_FREQUENCIES], tmp) {
request->channels[i] = ieee80211_get_channel(wiphy, nla_get_u32(attr));
if (!request->channels[i]) {
err = -EINVAL;
goto out_free;
}
i++;
}
} else {
/* all channels */
i = 0;
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
int j;
if (!wiphy->bands[band])
continue;
for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
request->channels[i] = &wiphy->bands[band]->channels[j];
i++;
}
}
}
i = 0;
if (info->attrs[NL80211_ATTR_SCAN_SSIDS]) {
nla_for_each_nested(attr, info->attrs[NL80211_ATTR_SCAN_SSIDS], tmp) {
if (request->ssids[i].ssid_len > IEEE80211_MAX_SSID_LEN) {
err = -EINVAL;
goto out_free;
}
memcpy(request->ssids[i].ssid, nla_data(attr), nla_len(attr));
request->ssids[i].ssid_len = nla_len(attr);
i++;
}
}
request->ifidx = dev->ifindex;
request->wiphy = &drv->wiphy;
drv->scan_req = request;
err = drv->ops->scan(&drv->wiphy, dev, request);
out_free:
if (err) {
drv->scan_req = NULL;
kfree(request);
}
out_unlock:
rtnl_unlock();
out:
cfg80211_put_dev(drv);
dev_put(dev);
return err;
}
static int nl80211_send_bss(struct sk_buff *msg, u32 pid, u32 seq, int flags,
struct cfg80211_registered_device *rdev,
struct net_device *dev,
struct cfg80211_bss *res)
{
void *hdr;
struct nlattr *bss;
hdr = nl80211hdr_put(msg, pid, seq, flags,
NL80211_CMD_NEW_SCAN_RESULTS);
if (!hdr)
return -1;
NLA_PUT_U32(msg, NL80211_ATTR_SCAN_GENERATION,
rdev->bss_generation);
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, dev->ifindex);
bss = nla_nest_start(msg, NL80211_ATTR_BSS);
if (!bss)
goto nla_put_failure;
if (!is_zero_ether_addr(res->bssid))
NLA_PUT(msg, NL80211_BSS_BSSID, ETH_ALEN, res->bssid);
if (res->information_elements && res->len_information_elements)
NLA_PUT(msg, NL80211_BSS_INFORMATION_ELEMENTS,
res->len_information_elements,
res->information_elements);
if (res->tsf)
NLA_PUT_U64(msg, NL80211_BSS_TSF, res->tsf);
if (res->beacon_interval)
NLA_PUT_U16(msg, NL80211_BSS_BEACON_INTERVAL, res->beacon_interval);
NLA_PUT_U16(msg, NL80211_BSS_CAPABILITY, res->capability);
NLA_PUT_U32(msg, NL80211_BSS_FREQUENCY, res->channel->center_freq);
switch (res->signal_type) {
case CFG80211_SIGNAL_TYPE_MBM:
NLA_PUT_U32(msg, NL80211_BSS_SIGNAL_MBM, res->signal);
break;
case CFG80211_SIGNAL_TYPE_UNSPEC:
NLA_PUT_U8(msg, NL80211_BSS_SIGNAL_UNSPEC, res->signal);
break;
default:
break;
}
nla_nest_end(msg, bss);
return genlmsg_end(msg, hdr);
nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
static int nl80211_dump_scan(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct cfg80211_registered_device *dev;
struct net_device *netdev;
struct cfg80211_internal_bss *scan;
int ifidx = cb->args[0];
int start = cb->args[1], idx = 0;
int err;
if (!ifidx) {
err = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl80211_fam.hdrsize,
nl80211_fam.attrbuf, nl80211_fam.maxattr,
nl80211_policy);
if (err)
return err;
if (!nl80211_fam.attrbuf[NL80211_ATTR_IFINDEX])
return -EINVAL;
ifidx = nla_get_u32(nl80211_fam.attrbuf[NL80211_ATTR_IFINDEX]);
if (!ifidx)
return -EINVAL;
cb->args[0] = ifidx;
}
netdev = dev_get_by_index(&init_net, ifidx);
if (!netdev)
return -ENODEV;
dev = cfg80211_get_dev_from_ifindex(ifidx);
if (IS_ERR(dev)) {
err = PTR_ERR(dev);
goto out_put_netdev;
}
spin_lock_bh(&dev->bss_lock);
cfg80211_bss_expire(dev);
list_for_each_entry(scan, &dev->bss_list, list) {
if (++idx <= start)
continue;
if (nl80211_send_bss(skb,
NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
dev, netdev, &scan->pub) < 0) {
idx--;
goto out;
}
}
out:
spin_unlock_bh(&dev->bss_lock);
cb->args[1] = idx;
err = skb->len;
cfg80211_put_dev(dev);
out_put_netdev:
dev_put(netdev);
return err;
}
static struct genl_ops nl80211_ops[] = {
{
.cmd = NL80211_CMD_GET_WIPHY,
@ -2443,12 +2688,26 @@ static struct genl_ops nl80211_ops[] = {
.policy = nl80211_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NL80211_CMD_TRIGGER_SCAN,
.doit = nl80211_trigger_scan,
.policy = nl80211_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = NL80211_CMD_GET_SCAN,
.policy = nl80211_policy,
.dumpit = nl80211_dump_scan,
},
};
/* multicast groups */
static struct genl_multicast_group nl80211_config_mcgrp = {
.name = "config",
};
static struct genl_multicast_group nl80211_scan_mcgrp = {
.name = "scan",
};
/* notification functions */
@ -2468,6 +2727,66 @@ void nl80211_notify_dev_rename(struct cfg80211_registered_device *rdev)
genlmsg_multicast(msg, 0, nl80211_config_mcgrp.id, GFP_KERNEL);
}
static int nl80211_send_scan_donemsg(struct sk_buff *msg,
struct cfg80211_registered_device *rdev,
struct net_device *netdev,
u32 pid, u32 seq, int flags,
u32 cmd)
{
void *hdr;
hdr = nl80211hdr_put(msg, pid, seq, flags, cmd);
if (!hdr)
return -1;
NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->idx);
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, netdev->ifindex);
/* XXX: we should probably bounce back the request? */
return genlmsg_end(msg, hdr);
nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
void nl80211_send_scan_done(struct cfg80211_registered_device *rdev,
struct net_device *netdev)
{
struct sk_buff *msg;
msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (!msg)
return;
if (nl80211_send_scan_donemsg(msg, rdev, netdev, 0, 0, 0,
NL80211_CMD_NEW_SCAN_RESULTS) < 0) {
nlmsg_free(msg);
return;
}
genlmsg_multicast(msg, 0, nl80211_scan_mcgrp.id, GFP_KERNEL);
}
void nl80211_send_scan_aborted(struct cfg80211_registered_device *rdev,
struct net_device *netdev)
{
struct sk_buff *msg;
msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (!msg)
return;
if (nl80211_send_scan_donemsg(msg, rdev, netdev, 0, 0, 0,
NL80211_CMD_SCAN_ABORTED) < 0) {
nlmsg_free(msg);
return;
}
genlmsg_multicast(msg, 0, nl80211_scan_mcgrp.id, GFP_KERNEL);
}
/* initialisation/exit functions */
int nl80211_init(void)
@ -2488,6 +2807,10 @@ int nl80211_init(void)
if (err)
goto err_out;
err = genl_register_mc_group(&nl80211_fam, &nl80211_scan_mcgrp);
if (err)
goto err_out;
return 0;
err_out:
genl_unregister_family(&nl80211_fam);

8
net/wireless/nl80211.h
View file

@ -7,6 +7,10 @@
extern int nl80211_init(void);
extern void nl80211_exit(void);
extern void nl80211_notify_dev_rename(struct cfg80211_registered_device *rdev);
extern void nl80211_send_scan_done(struct cfg80211_registered_device *rdev,
struct net_device *netdev);
extern void nl80211_send_scan_aborted(struct cfg80211_registered_device *rdev,
struct net_device *netdev);
#else
static inline int nl80211_init(void)
{
@ -19,6 +23,10 @@ static inline void nl80211_notify_dev_rename(
struct cfg80211_registered_device *rdev)
{
}
static inline void
nl80211_send_scan_done(struct cfg80211_registered_device *rdev,
struct net_device *netdev)
{}
#endif /* CONFIG_NL80211 */
#endif /* __NET_WIRELESS_NL80211_H */

807
net/wireless/scan.c Normal file
View file

@ -0,0 +1,807 @@
/*
* cfg80211 scan result handling
*
* Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/wireless.h>
#include <linux/nl80211.h>
#include <linux/etherdevice.h>
#include <net/arp.h>
#include <net/cfg80211.h>
#include <net/iw_handler.h>
#include "core.h"
#include "nl80211.h"
#define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
{
struct net_device *dev;
#ifdef CONFIG_WIRELESS_EXT
union iwreq_data wrqu;
#endif
dev = dev_get_by_index(&init_net, request->ifidx);
if (!dev)
goto out;
WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
wiphy_to_dev(request->wiphy)->scan_req = NULL;
if (aborted)
nl80211_send_scan_aborted(wiphy_to_dev(request->wiphy), dev);
else
nl80211_send_scan_done(wiphy_to_dev(request->wiphy), dev);
#ifdef CONFIG_WIRELESS_EXT
if (!aborted) {
memset(&wrqu, 0, sizeof(wrqu));
wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
}
#endif
dev_put(dev);
out:
kfree(request);
}
EXPORT_SYMBOL(cfg80211_scan_done);
static void bss_release(struct kref *ref)
{
struct cfg80211_internal_bss *bss;
bss = container_of(ref, struct cfg80211_internal_bss, ref);
kfree(bss);
}
/* must hold dev->bss_lock! */
void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
{
struct cfg80211_internal_bss *bss, *tmp;
bool expired = false;
list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
continue;
list_del(&bss->list);
rb_erase(&bss->rbn, &dev->bss_tree);
kref_put(&bss->ref, bss_release);
expired = true;
}
if (expired)
dev->bss_generation++;
}
static u8 *find_ie(u8 num, u8 *ies, size_t len)
{
while (len > 2 && ies[0] != num) {
len -= ies[1] + 2;
ies += ies[1] + 2;
}
if (len < 2)
return NULL;
if (len < 2 + ies[1])
return NULL;
return ies;
}
static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
{
const u8 *ie1 = find_ie(num, ies1, len1);
const u8 *ie2 = find_ie(num, ies2, len2);
int r;
if (!ie1 && !ie2)
return 0;
if (!ie1)
return -1;
r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
if (r == 0 && ie1[1] != ie2[1])
return ie2[1] - ie1[1];
return r;
}
static bool is_bss(struct cfg80211_bss *a,
const u8 *bssid,
const u8 *ssid, size_t ssid_len)
{
const u8 *ssidie;
if (compare_ether_addr(a->bssid, bssid))
return false;
ssidie = find_ie(WLAN_EID_SSID,
a->information_elements,
a->len_information_elements);
if (!ssidie)
return false;
if (ssidie[1] != ssid_len)
return false;
return memcmp(ssidie + 2, ssid, ssid_len) == 0;
}
static bool is_mesh(struct cfg80211_bss *a,
const u8 *meshid, size_t meshidlen,
const u8 *meshcfg)
{
const u8 *ie;
if (!is_zero_ether_addr(a->bssid))
return false;
ie = find_ie(WLAN_EID_MESH_ID,
a->information_elements,
a->len_information_elements);
if (!ie)
return false;
if (ie[1] != meshidlen)
return false;
if (memcmp(ie + 2, meshid, meshidlen))
return false;
ie = find_ie(WLAN_EID_MESH_CONFIG,
a->information_elements,
a->len_information_elements);
if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
return false;
/*
* Ignore mesh capability (last two bytes of the IE) when
* comparing since that may differ between stations taking
* part in the same mesh.
*/
return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0;
}
static int cmp_bss(struct cfg80211_bss *a,
struct cfg80211_bss *b)
{
int r;
if (a->channel != b->channel)
return b->channel->center_freq - a->channel->center_freq;
r = memcmp(a->bssid, b->bssid, ETH_ALEN);
if (r)
return r;
if (is_zero_ether_addr(a->bssid)) {
r = cmp_ies(WLAN_EID_MESH_ID,
a->information_elements,
a->len_information_elements,
b->information_elements,
b->len_information_elements);
if (r)
return r;
return cmp_ies(WLAN_EID_MESH_CONFIG,
a->information_elements,
a->len_information_elements,
b->information_elements,
b->len_information_elements);
}
return cmp_ies(WLAN_EID_SSID,
a->information_elements,
a->len_information_elements,
b->information_elements,
b->len_information_elements);
}
struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
struct ieee80211_channel *channel,
const u8 *bssid,
const u8 *ssid, size_t ssid_len)
{
struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
struct cfg80211_internal_bss *bss, *res = NULL;
spin_lock_bh(&dev->bss_lock);
list_for_each_entry(bss, &dev->bss_list, list) {
if (channel && bss->pub.channel != channel)
continue;
if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
res = bss;
kref_get(&res->ref);
break;
}
}
spin_unlock_bh(&dev->bss_lock);
if (!res)
return NULL;
return &res->pub;
}
EXPORT_SYMBOL(cfg80211_get_bss);
struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
struct ieee80211_channel *channel,
const u8 *meshid, size_t meshidlen,
const u8 *meshcfg)
{
struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
struct cfg80211_internal_bss *bss, *res = NULL;
spin_lock_bh(&dev->bss_lock);
list_for_each_entry(bss, &dev->bss_list, list) {
if (channel && bss->pub.channel != channel)
continue;
if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
res = bss;
kref_get(&res->ref);
break;
}
}
spin_unlock_bh(&dev->bss_lock);
if (!res)
return NULL;
return &res->pub;
}
EXPORT_SYMBOL(cfg80211_get_mesh);
static void rb_insert_bss(struct cfg80211_registered_device *dev,
struct cfg80211_internal_bss *bss)
{
struct rb_node **p = &dev->bss_tree.rb_node;
struct rb_node *parent = NULL;
struct cfg80211_internal_bss *tbss;
int cmp;
while (*p) {
parent = *p;
tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
cmp = cmp_bss(&bss->pub, &tbss->pub);
if (WARN_ON(!cmp)) {
/* will sort of leak this BSS */
return;
}
if (cmp < 0)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
rb_link_node(&bss->rbn, parent, p);
rb_insert_color(&bss->rbn, &dev->bss_tree);
}
static struct cfg80211_internal_bss *
rb_find_bss(struct cfg80211_registered_device *dev,
struct cfg80211_internal_bss *res)
{
struct rb_node *n = dev->bss_tree.rb_node;
struct cfg80211_internal_bss *bss;
int r;
while (n) {
bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
r = cmp_bss(&res->pub, &bss->pub);
if (r == 0)
return bss;
else if (r < 0)
n = n->rb_left;
else
n = n->rb_right;
}
return NULL;
}
static struct cfg80211_internal_bss *
cfg80211_bss_update(struct cfg80211_registered_device *dev,
struct cfg80211_internal_bss *res,
bool overwrite)
{
struct cfg80211_internal_bss *found = NULL;
const u8 *meshid, *meshcfg;
/*
* The reference to "res" is donated to this function.
*/
if (WARN_ON(!res->pub.channel)) {
kref_put(&res->ref, bss_release);
return NULL;
}
res->ts = jiffies;
if (is_zero_ether_addr(res->pub.bssid)) {
/* must be mesh, verify */
meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements,
res->pub.len_information_elements);
meshcfg = find_ie(WLAN_EID_MESH_CONFIG,
res->pub.information_elements,
res->pub.len_information_elements);
if (!meshid || !meshcfg ||
meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) {
/* bogus mesh */
kref_put(&res->ref, bss_release);
return NULL;
}
}
spin_lock_bh(&dev->bss_lock);
found = rb_find_bss(dev, res);
if (found && overwrite) {
list_replace(&found->list, &res->list);
rb_replace_node(&found->rbn, &res->rbn,
&dev->bss_tree);
kref_put(&found->ref, bss_release);
found = res;
} else if (found) {
kref_get(&found->ref);
found->pub.beacon_interval = res->pub.beacon_interval;
found->pub.tsf = res->pub.tsf;
found->pub.signal = res->pub.signal;
found->pub.signal_type = res->pub.signal_type;
found->pub.capability = res->pub.capability;
found->ts = res->ts;
kref_put(&res->ref, bss_release);
} else {
/* this "consumes" the reference */
list_add_tail(&res->list, &dev->bss_list);
rb_insert_bss(dev, res);
found = res;
}
dev->bss_generation++;
spin_unlock_bh(&dev->bss_lock);
kref_get(&found->ref);
return found;
}
struct cfg80211_bss *
cfg80211_inform_bss_frame(struct wiphy *wiphy,
struct ieee80211_channel *channel,
struct ieee80211_mgmt *mgmt, size_t len,
s32 signal, enum cfg80211_signal_type sigtype,
gfp_t gfp)
{
struct cfg80211_internal_bss *res;
size_t ielen = len - offsetof(struct ieee80211_mgmt,
u.probe_resp.variable);
bool overwrite;
size_t privsz = wiphy->bss_priv_size;
if (WARN_ON(sigtype == NL80211_BSS_SIGNAL_UNSPEC &&
(signal < 0 || signal > 100)))
return NULL;
if (WARN_ON(!mgmt || !wiphy ||
len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
return NULL;
res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
if (!res)
return NULL;
memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
res->pub.channel = channel;
res->pub.signal_type = sigtype;
res->pub.signal = signal;
res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
/* point to after the private area */
res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen);
res->pub.len_information_elements = ielen;
kref_init(&res->ref);
overwrite = ieee80211_is_probe_resp(mgmt->frame_control);
res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite);
if (!res)
return NULL;
/* cfg80211_bss_update gives us a referenced result */
return &res->pub;
}
EXPORT_SYMBOL(cfg80211_inform_bss_frame);
void cfg80211_put_bss(struct cfg80211_bss *pub)
{
struct cfg80211_internal_bss *bss;
if (!pub)
return;
bss = container_of(pub, struct cfg80211_internal_bss, pub);
kref_put(&bss->ref, bss_release);
}
EXPORT_SYMBOL(cfg80211_put_bss);
#ifdef CONFIG_WIRELESS_EXT
int cfg80211_wext_siwscan(struct net_device *dev,
struct iw_request_info *info,
union iwreq_data *wrqu, char *extra)
{
struct cfg80211_registered_device *rdev;
struct wiphy *wiphy;
struct iw_scan_req *wreq = NULL;
struct cfg80211_scan_request *creq;
int i, err, n_channels = 0;
enum ieee80211_band band;
if (!netif_running(dev))
return -ENETDOWN;
rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
if (IS_ERR(rdev))
return PTR_ERR(rdev);
if (rdev->scan_req) {
err = -EBUSY;
goto out;
}
wiphy = &rdev->wiphy;
for (band = 0; band < IEEE80211_NUM_BANDS; band++)
if (wiphy->bands[band])
n_channels += wiphy->bands[band]->n_channels;
creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
n_channels * sizeof(void *),
GFP_ATOMIC);
if (!creq) {
err = -ENOMEM;
goto out;
}
creq->wiphy = wiphy;
creq->ifidx = dev->ifindex;
creq->ssids = (void *)(creq + 1);
creq->channels = (void *)(creq->ssids + 1);
creq->n_channels = n_channels;
creq->n_ssids = 1;
/* all channels */
i = 0;
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
int j;
if (!wiphy->bands[band])
continue;
for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
creq->channels[i] = &wiphy->bands[band]->channels[j];
i++;
}
}
/* translate scan request */
if (wrqu->data.length == sizeof(struct iw_scan_req)) {
wreq = (struct iw_scan_req *)extra;
if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
if (wreq->essid_len > IEEE80211_MAX_SSID_LEN)
return -EINVAL;
memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
creq->ssids[0].ssid_len = wreq->essid_len;
}
if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
creq->n_ssids = 0;
}
rdev->scan_req = creq;
err = rdev->ops->scan(wiphy, dev, creq);
if (err) {
rdev->scan_req = NULL;
kfree(creq);
}
out:
cfg80211_put_dev(rdev);
return err;
}
EXPORT_SYMBOL(cfg80211_wext_siwscan);
static void ieee80211_scan_add_ies(struct iw_request_info *info,
struct cfg80211_bss *bss,
char **current_ev, char *end_buf)
{
u8 *pos, *end, *next;
struct iw_event iwe;
if (!bss->information_elements ||
!bss->len_information_elements)
return;
/*
* If needed, fragment the IEs buffer (at IE boundaries) into short
* enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
*/
pos = bss->information_elements;
end = pos + bss->len_information_elements;
while (end - pos > IW_GENERIC_IE_MAX) {
next = pos + 2 + pos[1];
while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
next = next + 2 + next[1];
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVGENIE;
iwe.u.data.length = next - pos;
*current_ev = iwe_stream_add_point(info, *current_ev,
end_buf, &iwe, pos);
pos = next;
}
if (end > pos) {
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVGENIE;
iwe.u.data.length = end - pos;
*current_ev = iwe_stream_add_point(info, *current_ev,
end_buf, &iwe, pos);
}
}
static char *
ieee80211_bss(struct iw_request_info *info,
struct cfg80211_internal_bss *bss,
char *current_ev, char *end_buf)
{
struct iw_event iwe;
u8 *buf, *cfg, *p;
u8 *ie = bss->pub.information_elements;
int rem = bss->pub.len_information_elements, i;
bool ismesh = false;
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWAP;
iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
IW_EV_ADDR_LEN);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWFREQ;
iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
iwe.u.freq.e = 0;
current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
IW_EV_FREQ_LEN);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWFREQ;
iwe.u.freq.m = bss->pub.channel->center_freq;
iwe.u.freq.e = 6;
current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
IW_EV_FREQ_LEN);
if (bss->pub.signal_type != CFG80211_SIGNAL_TYPE_NONE) {
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVQUAL;
iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
IW_QUAL_NOISE_INVALID |
IW_QUAL_QUAL_INVALID;
switch (bss->pub.signal_type) {
case CFG80211_SIGNAL_TYPE_MBM:
iwe.u.qual.level = bss->pub.signal / 100;
iwe.u.qual.updated |= IW_QUAL_DBM;
break;
case CFG80211_SIGNAL_TYPE_UNSPEC:
iwe.u.qual.level = bss->pub.signal;
break;
default:
/* not reached */
break;
}
current_ev = iwe_stream_add_event(info, current_ev, end_buf,
&iwe, IW_EV_QUAL_LEN);
}
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWENCODE;
if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
else
iwe.u.data.flags = IW_ENCODE_DISABLED;
iwe.u.data.length = 0;
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
&iwe, "");
while (rem >= 2) {
/* invalid data */
if (ie[1] > rem - 2)
break;
switch (ie[0]) {
case WLAN_EID_SSID:
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWESSID;
iwe.u.data.length = ie[1];
iwe.u.data.flags = 1;
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
&iwe, ie + 2);
break;
case WLAN_EID_MESH_ID:
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWESSID;
iwe.u.data.length = ie[1];
iwe.u.data.flags = 1;
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
&iwe, ie + 2);
break;
case WLAN_EID_MESH_CONFIG:
ismesh = true;
if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
break;
buf = kmalloc(50, GFP_ATOMIC);
if (!buf)
break;
cfg = ie + 2;
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
sprintf(buf, "Mesh network (version %d)", cfg[0]);
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev,
end_buf,
&iwe, buf);
sprintf(buf, "Path Selection Protocol ID: "
"0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
cfg[4]);
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev,
end_buf,
&iwe, buf);
sprintf(buf, "Path Selection Metric ID: "
"0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
cfg[8]);
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev,
end_buf,
&iwe, buf);
sprintf(buf, "Congestion Control Mode ID: "
"0x%02X%02X%02X%02X", cfg[9], cfg[10],
cfg[11], cfg[12]);
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev,
end_buf,
&iwe, buf);
sprintf(buf, "Channel Precedence: "
"0x%02X%02X%02X%02X", cfg[13], cfg[14],
cfg[15], cfg[16]);
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev,
end_buf,
&iwe, buf);
kfree(buf);
break;
case WLAN_EID_SUPP_RATES:
case WLAN_EID_EXT_SUPP_RATES:
/* display all supported rates in readable format */
p = current_ev + iwe_stream_lcp_len(info);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWRATE;
/* Those two flags are ignored... */
iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
for (i = 0; i < ie[1]; i++) {
iwe.u.bitrate.value =
((ie[i + 2] & 0x7f) * 500000);
p = iwe_stream_add_value(info, current_ev, p,
end_buf, &iwe, IW_EV_PARAM_LEN);
}
current_ev = p;
break;
}
rem -= ie[1] + 2;
ie += ie[1] + 2;
}
if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
|| ismesh) {
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = SIOCGIWMODE;
if (ismesh)
iwe.u.mode = IW_MODE_MESH;
else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
iwe.u.mode = IW_MODE_MASTER;
else
iwe.u.mode = IW_MODE_ADHOC;
current_ev = iwe_stream_add_event(info, current_ev, end_buf,
&iwe, IW_EV_UINT_LEN);
}
buf = kmalloc(30, GFP_ATOMIC);
if (buf) {
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev, end_buf,
&iwe, buf);
memset(&iwe, 0, sizeof(iwe));
iwe.cmd = IWEVCUSTOM;
sprintf(buf, " Last beacon: %dms ago",
jiffies_to_msecs(jiffies - bss->ts));
iwe.u.data.length = strlen(buf);
current_ev = iwe_stream_add_point(info, current_ev,
end_buf, &iwe, buf);
kfree(buf);
}
ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
return current_ev;
}
static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
struct iw_request_info *info,
char *buf, size_t len)
{
char *current_ev = buf;
char *end_buf = buf + len;
struct cfg80211_internal_bss *bss;
spin_lock_bh(&dev->bss_lock);
cfg80211_bss_expire(dev);
list_for_each_entry(bss, &dev->bss_list, list) {
if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
spin_unlock_bh(&dev->bss_lock);
return -E2BIG;
}
current_ev = ieee80211_bss(info, bss,
current_ev, end_buf);
}
spin_unlock_bh(&dev->bss_lock);
return current_ev - buf;
}
int cfg80211_wext_giwscan(struct net_device *dev,
struct iw_request_info *info,
struct iw_point *data, char *extra)
{
struct cfg80211_registered_device *rdev;
int res;
if (!netif_running(dev))
return -ENETDOWN;
rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
if (IS_ERR(rdev))
return PTR_ERR(rdev);
if (rdev->scan_req) {
res = -EAGAIN;
goto out;
}
res = ieee80211_scan_results(rdev, info, extra, data->length);
data->length = 0;
if (res >= 0) {
data->length = res;
res = 0;
}
out:
cfg80211_put_dev(rdev);
return res;
}
EXPORT_SYMBOL(cfg80211_wext_giwscan);
#endif