* published by the Free Software Foundation.
*/
-/* TODO:
- * order BSS list by RSSI(?) ("quality of AP")
- * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
- * SSID)
- */
-
#include <linux/wireless.h>
#include <linux/if_arp.h>
+#include <linux/rtnetlink.h>
#include <net/mac80211.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);
-}
+#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8)
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;
-}
-
-/* Caller must hold local->bss_lock */
-static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local,
- struct ieee80211_bss *bss)
-{
- 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);
-
- 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;
- }
+ return (void *)cfg80211_get_bss(local->hw.wiphy,
+ ieee80211_get_channel(local->hw.wiphy,
+ freq),
+ bssid, ssid, ssid_len,
+ 0, 0);
}
-struct ieee80211_bss *
-ieee80211_rx_bss_add(struct ieee80211_local *local, u8 *bssid, int freq,
- u8 *ssid, u8 ssid_len)
+static void ieee80211_rx_bss_free(struct cfg80211_bss *cbss)
{
- struct ieee80211_bss *bss;
+ struct ieee80211_bss *bss = (void *)cbss;
- 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 != MESH_CFG_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 *
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;
+ s32 signal = 0;
-#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 (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
+ signal = rx_status->signal * 100;
+ else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
+ signal = (rx_status->signal * 100) / local->hw.max_signal;
+
+ bss = (void *)cfg80211_inform_bss_frame(local->hw.wiphy, channel,
+ mgmt, len, signal, GFP_ATOMIC);
+
+ 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->dtim_period = tim_ie->dtim_period;
}
- /* set default value for buggy APs */
- if (!elems->tim || bss->dtim_period == 0)
+ /* set default value for buggy AP/no TIM element */
+ if (bss->dtim_period == 0)
bss->dtim_period = 1;
bss->supp_rates_len = 0;
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;
}
ieee80211_rx_result
-ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
- struct ieee80211_rx_status *rx_status)
+ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
{
+ struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
struct ieee80211_mgmt *mgmt;
struct ieee80211_bss *bss;
u8 *elements;
bss = ieee80211_bss_info_update(sdata->local, rx_status,
mgmt, skb->len, &elems,
- freq, beacon);
- ieee80211_rx_bss_put(sdata->local, bss);
+ channel, beacon);
+ if (bss)
+ ieee80211_rx_bss_put(sdata->local, bss);
dev_kfree_skb(skb);
return RX_QUEUED;
}
-static void ieee80211_send_nullfunc(struct ieee80211_local *local,
- struct ieee80211_sub_if_data *sdata,
- int powersave)
+/* return false if no more work */
+static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
{
- struct sk_buff *skb;
- struct ieee80211_hdr *nullfunc;
- __le16 fc;
+ struct cfg80211_scan_request *req = local->scan_req;
+ enum ieee80211_band band;
+ int i, ielen, n_chans;
+
+ do {
+ if (local->hw_scan_band == IEEE80211_NUM_BANDS)
+ return false;
+
+ band = local->hw_scan_band;
+ n_chans = 0;
+ for (i = 0; i < req->n_channels; i++) {
+ if (req->channels[i]->band == band) {
+ local->hw_scan_req->channels[n_chans] =
+ req->channels[i];
+ n_chans++;
+ }
+ }
- 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;
+ local->hw_scan_band++;
+ } while (!n_chans);
+
+ local->hw_scan_req->n_channels = n_chans;
+
+ ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie,
+ req->ie, req->ie_len, band);
+ local->hw_scan_req->ie_len = ielen;
+
+ return true;
+}
+
+/*
+ * 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 ieee80211_local *local = sdata->local;
+ bool ps = false;
+
+ /* 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);
}
-void ieee80211_scan_completed(struct ieee80211_hw *hw)
+/* 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);
+ }
+}
+
+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;
+ bool was_hw_scan;
+
+ mutex_lock(&local->scan_mtx);
- if (WARN_ON(!local->hw_scanning && !local->sw_scanning))
+ if (WARN_ON(!local->scanning)) {
+ mutex_unlock(&local->scan_mtx);
return;
+ }
- local->last_scan_completed = jiffies;
- memset(&wrqu, 0, sizeof(wrqu));
+ if (WARN_ON(!local->scan_req)) {
+ mutex_unlock(&local->scan_mtx);
+ 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);
+ was_hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning);
+ if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) {
+ ieee80211_queue_delayed_work(&local->hw,
+ &local->scan_work, 0);
+ mutex_unlock(&local->scan_mtx);
+ return;
+ }
- if (local->hw_scanning) {
- local->hw_scanning = false;
- if (ieee80211_hw_config(local))
- printk(KERN_DEBUG "%s: failed to restore operational "
- "channel after scan\n", wiphy_name(local->hw.wiphy));
+ kfree(local->hw_scan_req);
+ local->hw_scan_req = NULL;
- goto done;
- }
+ if (local->scan_req != local->int_scan_req)
+ cfg80211_scan_done(local->scan_req, aborted);
+ local->scan_req = NULL;
+ local->scan_sdata = NULL;
- local->sw_scanning = false;
- if (ieee80211_hw_config(local))
- printk(KERN_DEBUG "%s: failed to restore operational "
- "channel after scan\n", wiphy_name(local->hw.wiphy));
+ local->scanning = 0;
+ local->scan_channel = NULL;
+ /* we only have to protect scan_req and hw/sw scan */
+ mutex_unlock(&local->scan_mtx);
- 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);
+ ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
+ if (was_hw_scan)
+ goto done;
+
+ ieee80211_configure_filter(local);
- 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))
+ continue;
- rcu_read_lock();
- list_for_each_entry_rcu(sdata, &local->interfaces, list) {
/* Tell AP we're back */
- if (sdata->vif.type == IEEE80211_IF_TYPE_STA) {
- if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
- ieee80211_send_nullfunc(local, sdata, 0);
- netif_tx_wake_all_queues(sdata->dev);
+ if (sdata->vif.type == NL80211_IFTYPE_STATION) {
+ if (sdata->u.mgd.associated) {
+ ieee80211_scan_ps_disable(sdata);
+ netif_wake_queue(sdata->dev);
}
} else
- netif_tx_wake_all_queues(sdata->dev);
+ netif_wake_queue(sdata->dev);
+
+ /* re-enable 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);
}
- rcu_read_unlock();
+ 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);
-
-void ieee80211_scan_work(struct work_struct *work)
+static int ieee80211_start_sw_scan(struct ieee80211_local *local)
{
- 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;
- unsigned long next_delay = 0;
+ struct ieee80211_sub_if_data *sdata;
/*
- * Avoid re-scheduling when the sdata is going away.
+ * 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().
*/
- if (!netif_running(sdata->dev))
- return;
+ drv_sw_scan_start(local);
- 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;
+ 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 we are at an unsupported band and have more bands
- * left to scan, advance to the next supported one.
+ * only handle non-STA interfaces here, STA interfaces
+ * are handled in the scan state machine
*/
- 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 (sdata->vif.type != NL80211_IFTYPE_STATION)
+ netif_stop_queue(sdata->dev);
+ }
+ mutex_unlock(&local->iflist_mtx);
- /* if no more bands/channels left, complete scan */
- if (!sband || local->scan_channel_idx >= sband->n_channels) {
- ieee80211_scan_completed(local_to_hw(local));
- return;
- }
- skip = 0;
- chan = &sband->channels[local->scan_channel_idx];
+ local->next_scan_state = SCAN_DECISION;
+ local->scan_channel_idx = 0;
- if (chan->flags & IEEE80211_CHAN_DISABLED ||
- (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
- chan->flags & IEEE80211_CHAN_NO_IBSS))
- skip = 1;
+ ieee80211_configure_filter(local);
- if (!skip) {
- local->scan_channel = chan;
- if (ieee80211_hw_config(local)) {
- printk(KERN_DEBUG "%s: failed to set freq to "
- "%d MHz for scan\n", wiphy_name(local->hw.wiphy),
- chan->center_freq);
- skip = 1;
- }
- }
+ /* TODO: start scan as soon as all nullfunc frames are ACKed */
+ ieee80211_queue_delayed_work(&local->hw,
+ &local->scan_work,
+ IEEE80211_CHANNEL_TIME);
- /* 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;
- }
+ return 0;
+}
- if (skip)
- break;
- next_delay = IEEE80211_PROBE_DELAY +
- usecs_to_jiffies(local->hw.channel_change_time);
- local->scan_state = SCAN_SEND_PROBE;
- break;
- case SCAN_SEND_PROBE:
- next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
- local->scan_state = SCAN_SET_CHANNEL;
+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_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN)
- break;
- ieee80211_send_probe_req(sdata, NULL, local->scan_ssid,
- local->scan_ssid_len);
- next_delay = IEEE80211_CHANNEL_TIME;
- break;
- }
+ if (local->scan_req)
+ return -EBUSY;
- queue_delayed_work(local->hw.workqueue, &local->scan_work,
- next_delay);
-}
+ if (local->ops->hw_scan) {
+ u8 *ies;
+
+ local->hw_scan_req = kmalloc(
+ sizeof(*local->hw_scan_req) +
+ req->n_channels * sizeof(req->channels[0]) +
+ 2 + IEEE80211_MAX_SSID_LEN + local->scan_ies_len +
+ req->ie_len, GFP_KERNEL);
+ if (!local->hw_scan_req)
+ return -ENOMEM;
+
+ local->hw_scan_req->ssids = req->ssids;
+ local->hw_scan_req->n_ssids = req->n_ssids;
+ ies = (u8 *)local->hw_scan_req +
+ sizeof(*local->hw_scan_req) +
+ req->n_channels * sizeof(req->channels[0]);
+ local->hw_scan_req->ie = ies;
+
+ local->hw_scan_band = 0;
+ }
+ local->scan_req = req;
+ local->scan_sdata = sdata;
-int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata,
- u8 *ssid, size_t ssid_len)
-{
- struct ieee80211_local *local = scan_sdata->local;
- struct ieee80211_sub_if_data *sdata;
+ if (req != local->int_scan_req &&
+ sdata->vif.type == NL80211_IFTYPE_STATION &&
+ !list_empty(&ifmgd->work_list)) {
+ /* actually wait for the work it's doing to finish/time out */
+ set_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request);
+ return 0;
+ }
- if (ssid_len > IEEE80211_MAX_SSID_LEN)
- return -EINVAL;
-
- /* 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
+ if (local->ops->hw_scan)
+ __set_bit(SCAN_HW_SCANNING, &local->scanning);
+ else
+ __set_bit(SCAN_SW_SCANNING, &local->scanning);
+ /*
+ * 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.
*/
- /* MLME-SCAN.confirm
- * BSSDescriptionSet
- * ResultCode: SUCCESS, INVALID_PARAMETERS
- */
+ ieee80211_recalc_idle(local);
+ mutex_unlock(&local->scan_mtx);
- if (local->sw_scanning || local->hw_scanning) {
- if (local->scan_sdata == scan_sdata)
- return 0;
- return -EBUSY;
+ if (local->ops->hw_scan) {
+ WARN_ON(!ieee80211_prep_hw_scan(local));
+ rc = drv_hw_scan(local, local->hw_scan_req);
+ } else
+ rc = ieee80211_start_sw_scan(local);
+
+ mutex_lock(&local->scan_mtx);
+
+ if (rc) {
+ kfree(local->hw_scan_req);
+ local->hw_scan_req = NULL;
+ local->scanning = 0;
+
+ ieee80211_recalc_idle(local);
+
+ local->scan_req = NULL;
+ local->scan_sdata = NULL;
}
- if (local->ops->hw_scan) {
- int rc;
+ return rc;
+}
- local->hw_scanning = true;
- rc = local->ops->hw_scan(local_to_hw(local), ssid, ssid_len);
- if (rc) {
- local->hw_scanning = false;
- return rc;
- }
- local->scan_sdata = scan_sdata;
- return 0;
+static int ieee80211_scan_state_decision(struct ieee80211_local *local,
+ unsigned long *next_delay)
+{
+ bool associated = false;
+ struct ieee80211_sub_if_data *sdata;
+
+ /* if no more bands/channels left, complete scan and advance to the idle state */
+ if (local->scan_channel_idx >= local->scan_req->n_channels) {
+ ieee80211_scan_completed(&local->hw, false);
+ return 1;
}
- local->sw_scanning = true;
+ /* check if at least one STA interface is associated */
+ mutex_lock(&local->iflist_mtx);
+ list_for_each_entry(sdata, &local->interfaces, list) {
+ if (!netif_running(sdata->dev))
+ continue;
- rcu_read_lock();
- list_for_each_entry_rcu(sdata, &local->interfaces, list) {
- if (sdata->vif.type == IEEE80211_IF_TYPE_STA) {
- if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
- netif_tx_stop_all_queues(sdata->dev);
- ieee80211_send_nullfunc(local, sdata, 1);
+ if (sdata->vif.type == NL80211_IFTYPE_STATION) {
+ if (sdata->u.mgd.associated) {
+ associated = true;
+ break;
}
- } else
- netif_tx_stop_all_queues(sdata->dev);
+ }
}
- rcu_read_unlock();
+ 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;
-
- 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);
+ if (local->scan_channel) {
+ /*
+ * we're currently scanning a different channel, let's
+ * switch back to the operating channel now if at least
+ * one interface is associated. Otherwise just scan the
+ * next channel
+ */
+ if (associated)
+ local->next_scan_state = SCAN_ENTER_OPER_CHANNEL;
+ else
+ local->next_scan_state = SCAN_SET_CHANNEL;
+ } else {
+ /*
+ * we're on the operating channel currently, let's
+ * leave that channel now to scan another one
+ */
+ local->next_scan_state = SCAN_LEAVE_OPER_CHANNEL;
+ }
+ *next_delay = 0;
return 0;
}
+static void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local *local,
+ unsigned long *next_delay)
+{
+ struct ieee80211_sub_if_data *sdata;
-int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
- u8 *ssid, size_t ssid_len)
+ /*
+ * notify the AP about us leaving the channel and stop all STA interfaces
+ */
+ mutex_lock(&local->iflist_mtx);
+ list_for_each_entry(sdata, &local->interfaces, list) {
+ if (!netif_running(sdata->dev))
+ continue;
+
+ if (sdata->vif.type == NL80211_IFTYPE_STATION) {
+ netif_stop_queue(sdata->dev);
+ if (sdata->u.mgd.associated)
+ ieee80211_scan_ps_enable(sdata);
+ }
+ }
+ mutex_unlock(&local->iflist_mtx);
+
+ __set_bit(SCAN_OFF_CHANNEL, &local->scanning);
+
+ /* advance to the next channel to be scanned */
+ *next_delay = HZ / 10;
+ local->next_scan_state = SCAN_SET_CHANNEL;
+}
+
+static void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local *local,
+ unsigned long *next_delay)
{
- struct ieee80211_local *local = sdata->local;
- struct ieee80211_if_sta *ifsta;
+ struct ieee80211_sub_if_data *sdata = local->scan_sdata;
- if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
- return ieee80211_start_scan(sdata, ssid, ssid_len);
+ /* switch back to the operating channel */
+ local->scan_channel = NULL;
+ ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
/*
- * 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.
+ * notify the AP about us being back and restart all STA interfaces
*/
+ mutex_lock(&local->iflist_mtx);
+ list_for_each_entry(sdata, &local->interfaces, list) {
+ if (!netif_running(sdata->dev))
+ continue;
- if (local->sw_scanning || local->hw_scanning) {
- if (local->scan_sdata == sdata)
- return 0;
- return -EBUSY;
+ /* Tell AP we're back */
+ if (sdata->vif.type == NL80211_IFTYPE_STATION) {
+ if (sdata->u.mgd.associated)
+ ieee80211_scan_ps_disable(sdata);
+ netif_wake_queue(sdata->dev);
+ }
}
+ mutex_unlock(&local->iflist_mtx);
- 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);
+ __clear_bit(SCAN_OFF_CHANNEL, &local->scanning);
- return 0;
+ *next_delay = HZ / 5;
+ local->next_scan_state = SCAN_DECISION;
}
-
-static void ieee80211_scan_add_ies(struct iw_request_info *info,
- struct ieee80211_bss *bss,
- char **current_ev, char *end_buf)
+static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
+ unsigned long *next_delay)
{
- u8 *pos, *end, *next;
- struct iw_event iwe;
+ int skip;
+ struct ieee80211_channel *chan;
+ struct ieee80211_sub_if_data *sdata = local->scan_sdata;
- if (bss == NULL || bss->ies == NULL)
- return;
+ skip = 0;
+ chan = local->scan_req->channels[local->scan_channel_idx];
- /*
- * 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;
+ if (chan->flags & IEEE80211_CHAN_DISABLED ||
+ (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
+ chan->flags & IEEE80211_CHAN_NO_IBSS))
+ skip = 1;
- 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];
+ if (!skip) {
+ local->scan_channel = chan;
+ if (ieee80211_hw_config(local,
+ IEEE80211_CONF_CHANGE_CHANNEL))
+ skip = 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);
+ /* advance state machine to next channel/band */
+ local->scan_channel_idx++;
- pos = next;
+ if (skip) {
+ /* if we skip this channel return to the decision state */
+ local->next_scan_state = SCAN_DECISION;
+ return;
}
- 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);
+ /*
+ * 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;
+ local->next_scan_state = SCAN_DECISION;
+ return;
}
+
+ /* active scan, send probes */
+ *next_delay = IEEE80211_PROBE_DELAY;
+ local->next_scan_state = SCAN_SEND_PROBE;
}
+static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
+ unsigned long *next_delay)
+{
+ int i;
+ struct ieee80211_sub_if_data *sdata = local->scan_sdata;
+
+ 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->ie, local->scan_req->ie_len);
-static char *
-ieee80211_scan_result(struct ieee80211_local *local,
- struct iw_request_info *info,
- struct ieee80211_bss *bss,
- char *current_ev, char *end_buf)
+ /*
+ * After sending probe requests, wait for probe responses
+ * on the channel.
+ */
+ *next_delay = IEEE80211_CHANNEL_TIME;
+ local->next_scan_state = SCAN_DECISION;
+}
+
+void ieee80211_scan_work(struct work_struct *work)
{
- 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);
+ struct ieee80211_local *local =
+ container_of(work, struct ieee80211_local, scan_work.work);
+ struct ieee80211_sub_if_data *sdata = local->scan_sdata;
+ unsigned long next_delay = 0;
+
+ mutex_lock(&local->scan_mtx);
+ if (!sdata || !local->scan_req) {
+ mutex_unlock(&local->scan_mtx);
+ return;
}
- 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);
+ if (local->hw_scan_req) {
+ int rc = drv_hw_scan(local, local->hw_scan_req);
+ mutex_unlock(&local->scan_mtx);
+ if (rc)
+ ieee80211_scan_completed(&local->hw, true);
+ return;
}
- 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, ¤t_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;
+ if (local->scan_req && !local->scanning) {
+ struct cfg80211_scan_request *req = local->scan_req;
+ int rc;
+
+ local->scan_req = NULL;
+ local->scan_sdata = NULL;
+
+ rc = __ieee80211_start_scan(sdata, req);
+ mutex_unlock(&local->scan_mtx);
+
+ if (rc)
+ ieee80211_scan_completed(&local->hw, true);
+ return;
}
- 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);
+ mutex_unlock(&local->scan_mtx);
+
+ /*
+ * Avoid re-scheduling when the sdata is going away.
+ */
+ if (!netif_running(sdata->dev)) {
+ ieee80211_scan_completed(&local->hw, true);
+ return;
}
- 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);
+ /*
+ * as long as no delay is required advance immediately
+ * without scheduling a new work
+ */
+ do {
+ switch (local->next_scan_state) {
+ case SCAN_DECISION:
+ if (ieee80211_scan_state_decision(local, &next_delay))
+ return;
+ break;
+ case SCAN_SET_CHANNEL:
+ ieee80211_scan_state_set_channel(local, &next_delay);
+ break;
+ case SCAN_SEND_PROBE:
+ ieee80211_scan_state_send_probe(local, &next_delay);
+ break;
+ case SCAN_LEAVE_OPER_CHANNEL:
+ ieee80211_scan_state_leave_oper_channel(local, &next_delay);
+ break;
+ case SCAN_ENTER_OPER_CHANNEL:
+ ieee80211_scan_state_enter_oper_channel(local, &next_delay);
+ break;
}
- }
+ } while (next_delay == 0);
- return current_ev;
+ ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay);
}
+int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
+ struct cfg80211_scan_request *req)
+{
+ int res;
+
+ mutex_lock(&sdata->local->scan_mtx);
+ res = __ieee80211_start_scan(sdata, req);
+ mutex_unlock(&sdata->local->scan_mtx);
-int ieee80211_scan_results(struct ieee80211_local *local,
- struct iw_request_info *info,
- char *buf, size_t len)
+ return res;
+}
+
+int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata,
+ const u8 *ssid, u8 ssid_len)
{
- char *current_ev = buf;
- char *end_buf = buf + len;
- struct ieee80211_bss *bss;
+ struct ieee80211_local *local = sdata->local;
+ int ret = -EBUSY;
- 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;
+ mutex_lock(&local->scan_mtx);
+
+ /* busy scanning */
+ if (local->scan_req)
+ goto unlock;
+
+ memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
+ local->int_scan_req->ssids[0].ssid_len = ssid_len;
+
+ ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
+ unlock:
+ mutex_unlock(&local->scan_mtx);
+ return ret;
+}
+
+void ieee80211_scan_cancel(struct ieee80211_local *local)
+{
+ bool abortscan;
+
+ cancel_delayed_work_sync(&local->scan_work);
+
+ /*
+ * Only call this function when a scan can't be
+ * queued -- mostly at suspend under RTNL.
+ */
+ mutex_lock(&local->scan_mtx);
+ abortscan = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
+ (!local->scanning && local->scan_req);
+ mutex_unlock(&local->scan_mtx);
+
+ if (abortscan)
+ ieee80211_scan_completed(&local->hw, true);
}