* published by the Free Software Foundation.
*/
-/* TODO:
- * figure out how to avoid that the "current BSS" expires
- * use cfg80211's BSS handling
- */
+/* TODO: figure out how to avoid that the "current BSS" expires */
#include <linux/wireless.h>
#include <linux/if_arp.h>
#include <net/iw_handler.h>
#include "ieee80211_i.h"
+#include "driver-ops.h"
#include "mesh.h"
#define IEEE80211_PROBE_DELAY (HZ / 33)
#define IEEE80211_CHANNEL_TIME (HZ / 33)
#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
-void ieee80211_rx_bss_list_init(struct ieee80211_local *local)
-{
- spin_lock_init(&local->bss_lock);
- INIT_LIST_HEAD(&local->bss_list);
-}
-
-void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local)
-{
- struct ieee80211_bss *bss, *tmp;
-
- list_for_each_entry_safe(bss, tmp, &local->bss_list, list)
- ieee80211_rx_bss_put(local, bss);
-}
-
struct ieee80211_bss *
ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
u8 *ssid, u8 ssid_len)
{
- struct ieee80211_bss *bss;
-
- spin_lock_bh(&local->bss_lock);
- bss = local->bss_hash[STA_HASH(bssid)];
- while (bss) {
- if (!bss_mesh_cfg(bss) &&
- !memcmp(bss->bssid, bssid, ETH_ALEN) &&
- bss->freq == freq &&
- bss->ssid_len == ssid_len &&
- (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
- atomic_inc(&bss->users);
- break;
- }
- bss = bss->hnext;
- }
- spin_unlock_bh(&local->bss_lock);
- return bss;
+ return (void *)cfg80211_get_bss(local->hw.wiphy,
+ ieee80211_get_channel(local->hw.wiphy,
+ freq),
+ bssid, ssid, ssid_len,
+ 0, 0);
}
-/* Caller must hold local->bss_lock */
-static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local,
- struct ieee80211_bss *bss)
+static void ieee80211_rx_bss_free(struct cfg80211_bss *cbss)
{
- u8 hash_idx;
-
- if (bss_mesh_cfg(bss))
- hash_idx = mesh_id_hash(bss_mesh_id(bss),
- bss_mesh_id_len(bss));
- else
- hash_idx = STA_HASH(bss->bssid);
+ struct ieee80211_bss *bss = (void *)cbss;
- bss->hnext = local->bss_hash[hash_idx];
- local->bss_hash[hash_idx] = bss;
-}
-
-/* Caller must hold local->bss_lock */
-static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local,
- struct ieee80211_bss *bss)
-{
- struct ieee80211_bss *b, *prev = NULL;
- b = local->bss_hash[STA_HASH(bss->bssid)];
- while (b) {
- if (b == bss) {
- if (!prev)
- local->bss_hash[STA_HASH(bss->bssid)] =
- bss->hnext;
- else
- prev->hnext = bss->hnext;
- break;
- }
- prev = b;
- b = b->hnext;
- }
-}
-
-static struct ieee80211_bss *
-ieee80211_rx_bss_add(struct ieee80211_local *local, u8 *bssid, int freq,
- u8 *ssid, u8 ssid_len)
-{
- struct ieee80211_bss *bss;
-
- bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
- if (!bss)
- return NULL;
- atomic_set(&bss->users, 2);
- memcpy(bss->bssid, bssid, ETH_ALEN);
- bss->freq = freq;
- if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
- memcpy(bss->ssid, ssid, ssid_len);
- bss->ssid_len = ssid_len;
- }
-
- spin_lock_bh(&local->bss_lock);
- /* TODO: order by RSSI? */
- list_add_tail(&bss->list, &local->bss_list);
- __ieee80211_rx_bss_hash_add(local, bss);
- spin_unlock_bh(&local->bss_lock);
- return bss;
-}
-
-#ifdef CONFIG_MAC80211_MESH
-static struct ieee80211_bss *
-ieee80211_rx_mesh_bss_get(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
- u8 *mesh_cfg, int freq)
-{
- struct ieee80211_bss *bss;
-
- spin_lock_bh(&local->bss_lock);
- bss = local->bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
- while (bss) {
- if (bss_mesh_cfg(bss) &&
- !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
- bss->freq == freq &&
- mesh_id_len == bss->mesh_id_len &&
- (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
- mesh_id_len))) {
- atomic_inc(&bss->users);
- break;
- }
- bss = bss->hnext;
- }
- spin_unlock_bh(&local->bss_lock);
- return bss;
-}
-
-static struct ieee80211_bss *
-ieee80211_rx_mesh_bss_add(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
- u8 *mesh_cfg, int mesh_config_len, int freq)
-{
- struct ieee80211_bss *bss;
-
- if (mesh_config_len != IEEE80211_MESH_CONFIG_LEN)
- return NULL;
-
- bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
- if (!bss)
- return NULL;
-
- bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
- if (!bss->mesh_cfg) {
- kfree(bss);
- return NULL;
- }
-
- if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
- bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
- if (!bss->mesh_id) {
- kfree(bss->mesh_cfg);
- kfree(bss);
- return NULL;
- }
- memcpy(bss->mesh_id, mesh_id, mesh_id_len);
- }
-
- atomic_set(&bss->users, 2);
- memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
- bss->mesh_id_len = mesh_id_len;
- bss->freq = freq;
- spin_lock_bh(&local->bss_lock);
- /* TODO: order by RSSI? */
- list_add_tail(&bss->list, &local->bss_list);
- __ieee80211_rx_bss_hash_add(local, bss);
- spin_unlock_bh(&local->bss_lock);
- return bss;
-}
-#endif
-
-static void ieee80211_rx_bss_free(struct ieee80211_bss *bss)
-{
- kfree(bss->ies);
kfree(bss_mesh_id(bss));
kfree(bss_mesh_cfg(bss));
- kfree(bss);
}
void ieee80211_rx_bss_put(struct ieee80211_local *local,
struct ieee80211_bss *bss)
{
- local_bh_disable();
- if (!atomic_dec_and_lock(&bss->users, &local->bss_lock)) {
- local_bh_enable();
- return;
- }
-
- __ieee80211_rx_bss_hash_del(local, bss);
- list_del(&bss->list);
- spin_unlock_bh(&local->bss_lock);
- ieee80211_rx_bss_free(bss);
+ cfg80211_put_bss((struct cfg80211_bss *)bss);
}
struct ieee80211_bss *
bool beacon)
{
struct ieee80211_bss *bss;
- int clen, freq = channel->center_freq;
- enum cfg80211_signal_type sigtype = CFG80211_SIGNAL_TYPE_NONE;
+ int clen;
s32 signal = 0;
- if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
- sigtype = CFG80211_SIGNAL_TYPE_MBM;
+ if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
signal = rx_status->signal * 100;
- } else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) {
- sigtype = CFG80211_SIGNAL_TYPE_UNSPEC;
+ else if (local->hw.flags & IEEE80211_HW_SIGNAL_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));
+ bss = (void *)cfg80211_inform_bss_frame(local->hw.wiphy, channel,
+ mgmt, len, signal, GFP_ATOMIC);
-#ifdef CONFIG_MAC80211_MESH
- if (elems->mesh_config)
- bss = ieee80211_rx_mesh_bss_get(local, elems->mesh_id,
- elems->mesh_id_len, elems->mesh_config, freq);
- else
-#endif
- bss = ieee80211_rx_bss_get(local, mgmt->bssid, freq,
- elems->ssid, elems->ssid_len);
- if (!bss) {
-#ifdef CONFIG_MAC80211_MESH
- if (elems->mesh_config)
- bss = ieee80211_rx_mesh_bss_add(local, elems->mesh_id,
- elems->mesh_id_len, elems->mesh_config,
- elems->mesh_config_len, freq);
- else
-#endif
- bss = ieee80211_rx_bss_add(local, mgmt->bssid, freq,
- elems->ssid, elems->ssid_len);
- if (!bss)
- return NULL;
- } else {
-#if 0
- /* TODO: order by RSSI? */
- spin_lock_bh(&local->bss_lock);
- list_move_tail(&bss->list, &local->bss_list);
- spin_unlock_bh(&local->bss_lock);
-#endif
- }
+ if (!bss)
+ return NULL;
+
+ bss->cbss.free_priv = ieee80211_rx_bss_free;
/* save the ERP value so that it is available at association time */
if (elems->erp_info && elems->erp_info_len >= 1) {
bss->has_erp_value = 1;
}
- bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
- bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
-
if (elems->tim) {
struct ieee80211_tim_ie *tim_ie =
(struct ieee80211_tim_ie *)elems->tim;
bss->supp_rates_len += clen;
}
- bss->band = rx_status->band;
-
- bss->timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
- bss->last_update = jiffies;
- bss->signal = rx_status->signal;
- bss->noise = rx_status->noise;
- bss->qual = rx_status->qual;
bss->wmm_used = elems->wmm_param || elems->wmm_info;
if (!beacon)
bss->last_probe_resp = jiffies;
- /*
- * For probe responses, or if we don't have any information yet,
- * use the IEs from the beacon.
- */
- if (!bss->ies || !beacon) {
- if (bss->ies == NULL || bss->ies_len < elems->total_len) {
- kfree(bss->ies);
- bss->ies = kmalloc(elems->total_len, GFP_ATOMIC);
- }
- if (bss->ies) {
- memcpy(bss->ies, elems->ie_start, elems->total_len);
- bss->ies_len = elems->total_len;
- } else
- bss->ies_len = 0;
- }
-
return bss;
}
bss = ieee80211_rx_bss_get(local, bssid, freq, ssid, ssid_len);
if (bss) {
- atomic_dec(&bss->users);
+ cfg80211_unlink_bss(local->hw.wiphy, (void *)bss);
ieee80211_rx_bss_put(local, bss);
}
}
return RX_QUEUED;
}
-void ieee80211_send_nullfunc(struct ieee80211_local *local,
- struct ieee80211_sub_if_data *sdata,
- int powersave)
+/*
+ * inform AP that we will go to sleep so that it will buffer the frames
+ * while we scan
+ */
+static void ieee80211_scan_ps_enable(struct ieee80211_sub_if_data *sdata)
{
- struct sk_buff *skb;
- struct ieee80211_hdr *nullfunc;
- __le16 fc;
+ struct ieee80211_local *local = sdata->local;
+ bool ps = false;
- skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
- if (!skb) {
- printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
- "frame\n", sdata->dev->name);
- return;
+ /* FIXME: what to do when local->pspolling is true? */
+
+ del_timer_sync(&local->dynamic_ps_timer);
+ cancel_work_sync(&local->dynamic_ps_enable_work);
+
+ if (local->hw.conf.flags & IEEE80211_CONF_PS) {
+ ps = true;
+ local->hw.conf.flags &= ~IEEE80211_CONF_PS;
+ ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
}
- skb_reserve(skb, local->hw.extra_tx_headroom);
-
- nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
- memset(nullfunc, 0, 24);
- fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
- IEEE80211_FCTL_TODS);
- if (powersave)
- fc |= cpu_to_le16(IEEE80211_FCTL_PM);
- nullfunc->frame_control = fc;
- memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
- memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
- memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
-
- ieee80211_tx_skb(sdata, skb, 0);
+
+ if (!ps || !(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK))
+ /*
+ * If power save was enabled, no need to send a nullfunc
+ * frame because AP knows that we are sleeping. But if the
+ * hardware is creating the nullfunc frame for power save
+ * status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not
+ * enabled) and power save was enabled, the firmware just
+ * sent a null frame with power save disabled. So we need
+ * to send a new nullfunc frame to inform the AP that we
+ * are again sleeping.
+ */
+ ieee80211_send_nullfunc(local, sdata, 1);
+}
+
+/* inform AP that we are awake again, unless power save is enabled */
+static void ieee80211_scan_ps_disable(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_local *local = sdata->local;
+
+ if (!local->ps_sdata)
+ ieee80211_send_nullfunc(local, sdata, 0);
+ else {
+ /*
+ * In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware
+ * will send a nullfunc frame with the powersave bit set
+ * even though the AP already knows that we are sleeping.
+ * This could be avoided by sending a null frame with power
+ * save bit disabled before enabling the power save, but
+ * this doesn't gain anything.
+ *
+ * When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need
+ * to send a nullfunc frame because AP already knows that
+ * we are sleeping, let's just enable power save mode in
+ * hardware.
+ */
+ local->hw.conf.flags |= IEEE80211_CONF_PS;
+ ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
+ }
+}
+
+static void ieee80211_restore_scan_ies(struct ieee80211_local *local)
+{
+ kfree(local->scan_req->ie);
+ local->scan_req->ie = local->orig_ies;
+ local->scan_req->ie_len = local->orig_ies_len;
}
void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_sub_if_data *sdata;
+ bool was_hw_scan;
- if (WARN_ON(!local->hw_scanning && !local->sw_scanning))
+ mutex_lock(&local->scan_mtx);
+
+ if (WARN_ON(!local->hw_scanning && !local->sw_scanning)) {
+ mutex_unlock(&local->scan_mtx);
return;
+ }
- if (WARN_ON(!local->scan_req))
+ if (WARN_ON(!local->scan_req)) {
+ mutex_unlock(&local->scan_mtx);
return;
+ }
+
+ if (local->hw_scanning)
+ ieee80211_restore_scan_ies(local);
if (local->scan_req != &local->int_scan_req)
cfg80211_scan_done(local->scan_req, aborted);
local->scan_req = NULL;
- local->last_scan_completed = jiffies;
+ was_hw_scan = local->hw_scanning;
+ local->hw_scanning = false;
+ local->sw_scanning = false;
+ local->scan_channel = NULL;
- if (local->hw_scanning) {
- local->hw_scanning = false;
- /*
- * Somebody might have requested channel change during scan
- * that we won't have acted upon, try now. ieee80211_hw_config
- * will set the flag based on actual changes.
- */
- ieee80211_hw_config(local, 0);
- goto done;
- }
+ /* we only have to protect scan_req and hw/sw scan */
+ mutex_unlock(&local->scan_mtx);
- local->sw_scanning = false;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
+ if (was_hw_scan)
+ goto done;
netif_tx_lock_bh(local->mdev);
netif_addr_lock(local->mdev);
local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
- local->ops->configure_filter(local_to_hw(local),
- FIF_BCN_PRBRESP_PROMISC,
- &local->filter_flags,
- local->mdev->mc_count,
- local->mdev->mc_list);
+ drv_configure_filter(local, FIF_BCN_PRBRESP_PROMISC,
+ &local->filter_flags,
+ local->mdev->mc_count,
+ local->mdev->mc_list);
netif_addr_unlock(local->mdev);
netif_tx_unlock_bh(local->mdev);
+ drv_sw_scan_complete(local);
+
mutex_lock(&local->iflist_mtx);
list_for_each_entry(sdata, &local->interfaces, list) {
if (!netif_running(sdata->dev))
/* Tell AP we're back */
if (sdata->vif.type == NL80211_IFTYPE_STATION) {
- if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
- ieee80211_send_nullfunc(local, sdata, 0);
+ if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED) {
+ ieee80211_scan_ps_disable(sdata);
netif_tx_wake_all_queues(sdata->dev);
}
} else
if (sdata->vif.type == NL80211_IFTYPE_AP ||
sdata->vif.type == NL80211_IFTYPE_ADHOC ||
sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
- ieee80211_if_config(sdata,
- IEEE80211_IFCC_BEACON_ENABLED);
+ ieee80211_bss_info_change_notify(
+ sdata, BSS_CHANGED_BEACON_ENABLED);
}
mutex_unlock(&local->iflist_mtx);
done:
+ ieee80211_recalc_idle(local);
ieee80211_mlme_notify_scan_completed(local);
+ ieee80211_ibss_notify_scan_completed(local);
ieee80211_mesh_notify_scan_completed(local);
}
EXPORT_SYMBOL(ieee80211_scan_completed);
+static int ieee80211_start_sw_scan(struct ieee80211_local *local)
+{
+ struct ieee80211_sub_if_data *sdata;
+
+ /*
+ * Hardware/driver doesn't support hw_scan, so use software
+ * scanning instead. First send a nullfunc frame with power save
+ * bit on so that AP will buffer the frames for us while we are not
+ * listening, then send probe requests to each channel and wait for
+ * the responses. After all channels are scanned, tune back to the
+ * original channel and send a nullfunc frame with power save bit
+ * off to trigger the AP to send us all the buffered frames.
+ *
+ * Note that while local->sw_scanning is true everything else but
+ * nullfunc frames and probe requests will be dropped in
+ * ieee80211_tx_h_check_assoc().
+ */
+ drv_sw_scan_start(local);
+
+ mutex_lock(&local->iflist_mtx);
+ list_for_each_entry(sdata, &local->interfaces, list) {
+ if (!netif_running(sdata->dev))
+ continue;
+
+ /* disable beaconing */
+ if (sdata->vif.type == NL80211_IFTYPE_AP ||
+ sdata->vif.type == NL80211_IFTYPE_ADHOC ||
+ sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
+ ieee80211_bss_info_change_notify(
+ sdata, BSS_CHANGED_BEACON_ENABLED);
+
+ if (sdata->vif.type == NL80211_IFTYPE_STATION) {
+ if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED) {
+ netif_tx_stop_all_queues(sdata->dev);
+ ieee80211_scan_ps_enable(sdata);
+ }
+ } else
+ netif_tx_stop_all_queues(sdata->dev);
+ }
+ mutex_unlock(&local->iflist_mtx);
+
+ local->scan_state = SCAN_SET_CHANNEL;
+ local->scan_channel_idx = 0;
+
+ netif_addr_lock_bh(local->mdev);
+ local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
+ drv_configure_filter(local, FIF_BCN_PRBRESP_PROMISC,
+ &local->filter_flags,
+ local->mdev->mc_count,
+ local->mdev->mc_list);
+ netif_addr_unlock_bh(local->mdev);
+
+ /* TODO: start scan as soon as all nullfunc frames are ACKed */
+ queue_delayed_work(local->hw.workqueue, &local->scan_work,
+ IEEE80211_CHANNEL_TIME);
+
+ return 0;
+}
+
+
+static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
+ struct cfg80211_scan_request *req)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
+ int rc;
+
+ if (local->scan_req)
+ return -EBUSY;
+
+ if (local->ops->hw_scan) {
+ u8 *ies;
+ int ielen;
+
+ ies = kmalloc(2 + IEEE80211_MAX_SSID_LEN +
+ local->scan_ies_len + req->ie_len, GFP_KERNEL);
+ if (!ies)
+ return -ENOMEM;
+
+ ielen = ieee80211_build_preq_ies(local, ies,
+ req->ie, req->ie_len);
+ local->orig_ies = req->ie;
+ local->orig_ies_len = req->ie_len;
+ req->ie = ies;
+ req->ie_len = ielen;
+ }
+
+ local->scan_req = req;
+ local->scan_sdata = sdata;
+
+ if (req != &local->int_scan_req &&
+ sdata->vif.type == NL80211_IFTYPE_STATION &&
+ (ifmgd->state == IEEE80211_STA_MLME_DIRECT_PROBE ||
+ ifmgd->state == IEEE80211_STA_MLME_AUTHENTICATE ||
+ ifmgd->state == IEEE80211_STA_MLME_ASSOCIATE)) {
+ /* actually wait for the assoc to finish/time out */
+ set_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request);
+ return 0;
+ }
+
+ if (local->ops->hw_scan)
+ local->hw_scanning = true;
+ else
+ local->sw_scanning = true;
+ /*
+ * Kicking off the scan need not be protected,
+ * only the scan variable stuff, since now
+ * local->scan_req is assigned and other callers
+ * will abort their scan attempts.
+ *
+ * This avoids getting a scan_mtx -> iflist_mtx
+ * dependency, so that the scan completed calls
+ * have more locking freedom.
+ */
+
+ ieee80211_recalc_idle(local);
+ mutex_unlock(&local->scan_mtx);
+
+ if (local->ops->hw_scan)
+ rc = drv_hw_scan(local, local->scan_req);
+ else
+ rc = ieee80211_start_sw_scan(local);
+
+ mutex_lock(&local->scan_mtx);
+
+ if (rc) {
+ if (local->ops->hw_scan) {
+ local->hw_scanning = false;
+ ieee80211_restore_scan_ies(local);
+ } else
+ local->sw_scanning = false;
+
+ ieee80211_recalc_idle(local);
+
+ local->scan_req = NULL;
+ local->scan_sdata = NULL;
+ }
+
+ return rc;
+}
+
void ieee80211_scan_work(struct work_struct *work)
{
struct ieee80211_local *local =
int skip, i;
unsigned long next_delay = 0;
+ mutex_lock(&local->scan_mtx);
+ if (!sdata || !local->scan_req) {
+ mutex_unlock(&local->scan_mtx);
+ return;
+ }
+
+ if (local->scan_req && !(local->sw_scanning || local->hw_scanning)) {
+ struct cfg80211_scan_request *req = local->scan_req;
+ int rc;
+
+ local->scan_req = NULL;
+
+ rc = __ieee80211_start_scan(sdata, req);
+ mutex_unlock(&local->scan_mtx);
+
+ if (rc)
+ ieee80211_scan_completed(&local->hw, true);
+ return;
+ }
+
+ mutex_unlock(&local->scan_mtx);
+
/*
* Avoid re-scheduling when the sdata is going away.
*/
- if (!netif_running(sdata->dev))
+ if (!netif_running(sdata->dev)) {
+ ieee80211_scan_completed(&local->hw, true);
return;
+ }
switch (local->scan_state) {
case SCAN_SET_CHANNEL:
/* if no more bands/channels left, complete scan */
if (local->scan_channel_idx >= local->scan_req->n_channels) {
- ieee80211_scan_completed(local_to_hw(local), false);
+ ieee80211_scan_completed(&local->hw, false);
return;
}
skip = 0;
if (skip)
break;
- next_delay = IEEE80211_PROBE_DELAY +
- usecs_to_jiffies(local->hw.channel_change_time);
+ /*
+ * Probe delay is used to update the NAV, cf. 11.1.3.2.2
+ * (which unfortunately doesn't say _why_ step a) is done,
+ * but it waits for the probe delay or until a frame is
+ * received - and the received frame would update the NAV).
+ * For now, we do not support waiting until a frame is
+ * received.
+ *
+ * In any case, it is not necessary for a passive scan.
+ */
+ if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN ||
+ !local->scan_req->n_ssids) {
+ next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
+ break;
+ }
+
+ next_delay = IEEE80211_PROBE_DELAY;
local->scan_state = SCAN_SEND_PROBE;
break;
case SCAN_SEND_PROBE:
- next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
- local->scan_state = SCAN_SET_CHANNEL;
-
- if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN ||
- !local->scan_req->n_ssids)
- break;
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);
+ local->scan_req->ssids[i].ssid_len,
+ local->scan_req->ie, local->scan_req->ie_len);
+
+ /*
+ * After sending probe requests, wait for probe responses
+ * on the channel.
+ */
next_delay = IEEE80211_CHANNEL_TIME;
+ local->scan_state = SCAN_SET_CHANNEL;
break;
}
next_delay);
}
-
-int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata,
- struct cfg80211_scan_request *req)
+int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
+ struct cfg80211_scan_request *req)
{
- struct ieee80211_local *local = scan_sdata->local;
- struct ieee80211_sub_if_data *sdata;
-
- 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
- * SSID
- * ScanType: ACTIVE, PASSIVE
- * ProbeDelay: delay (in microseconds) to be used prior to transmitting
- * a Probe frame during active scanning
- * ChannelList
- * MinChannelTime (>= ProbeDelay), in TU
- * MaxChannelTime: (>= MinChannelTime), in TU
- */
-
- /* MLME-SCAN.confirm
- * BSSDescriptionSet
- * ResultCode: SUCCESS, INVALID_PARAMETERS
- */
+ int res;
- if (local->sw_scanning || local->hw_scanning) {
- if (local->scan_sdata == scan_sdata)
- return 0;
- return -EBUSY;
- }
+ mutex_lock(&sdata->local->scan_mtx);
+ res = __ieee80211_start_scan(sdata, req);
+ mutex_unlock(&sdata->local->scan_mtx);
- if (local->ops->hw_scan) {
- int rc;
-
- local->hw_scanning = true;
- rc = local->ops->hw_scan(local_to_hw(local), req);
- if (rc) {
- local->hw_scanning = false;
- return rc;
- }
- local->scan_sdata = scan_sdata;
- return 0;
- }
-
- local->sw_scanning = true;
-
- mutex_lock(&local->iflist_mtx);
- list_for_each_entry(sdata, &local->interfaces, list) {
- if (!netif_running(sdata->dev))
- continue;
-
- /* disable beaconing */
- if (sdata->vif.type == NL80211_IFTYPE_AP ||
- sdata->vif.type == NL80211_IFTYPE_ADHOC ||
- sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
- ieee80211_if_config(sdata,
- IEEE80211_IFCC_BEACON_ENABLED);
-
- if (sdata->vif.type == NL80211_IFTYPE_STATION) {
- if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
- netif_tx_stop_all_queues(sdata->dev);
- ieee80211_send_nullfunc(local, sdata, 1);
- }
- } else
- netif_tx_stop_all_queues(sdata->dev);
- }
- mutex_unlock(&local->iflist_mtx);
-
- local->scan_state = SCAN_SET_CHANNEL;
- local->scan_channel_idx = 0;
- local->scan_sdata = scan_sdata;
- local->scan_req = req;
-
- netif_addr_lock_bh(local->mdev);
- local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
- local->ops->configure_filter(local_to_hw(local),
- FIF_BCN_PRBRESP_PROMISC,
- &local->filter_flags,
- local->mdev->mc_count,
- local->mdev->mc_list);
- netif_addr_unlock_bh(local->mdev);
-
- /* TODO: start scan as soon as all nullfunc frames are ACKed */
- queue_delayed_work(local->hw.workqueue, &local->scan_work,
- IEEE80211_CHANNEL_TIME);
-
- return 0;
+ return res;
}
-
-int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
- struct cfg80211_scan_request *req)
+int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata,
+ const u8 *ssid, u8 ssid_len)
{
struct ieee80211_local *local = sdata->local;
- struct ieee80211_if_sta *ifsta;
-
- if (!req)
- return -EINVAL;
+ int ret = -EBUSY;
- if (local->scan_req && local->scan_req != req)
- return -EBUSY;
+ mutex_lock(&local->scan_mtx);
- local->scan_req = req;
+ /* busy scanning */
+ if (local->scan_req)
+ goto unlock;
- if (sdata->vif.type != NL80211_IFTYPE_STATION)
- return ieee80211_start_scan(sdata, req);
+ memcpy(local->int_scan_req.ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
+ local->int_scan_req.ssids[0].ssid_len = ssid_len;
- /*
- * STA has a state machine that might need to defer scanning
- * while it's trying to associate/authenticate, therefore we
- * queue it up to the state machine in that case.
- */
-
- if (local->sw_scanning || local->hw_scanning) {
- if (local->scan_sdata == sdata)
- return 0;
- return -EBUSY;
- }
-
- ifsta = &sdata->u.sta;
- set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
- queue_work(local->hw.workqueue, &ifsta->work);
-
- return 0;
+ ret = __ieee80211_start_scan(sdata, &sdata->local->int_scan_req);
+ unlock:
+ mutex_unlock(&local->scan_mtx);
+ return ret;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff