* published by the Free Software Foundation.
*/
-/* TODO: figure out how to avoid that the "current BSS" expires */
-
-#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)
+#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)
{
- return (void *)cfg80211_get_bss(local->hw.wiphy,
- ieee80211_get_channel(local->hw.wiphy,
- freq),
- bssid, ssid, ssid_len,
- 0, 0);
+ struct cfg80211_bss *cbss;
+
+ cbss = cfg80211_get_bss(local->hw.wiphy,
+ ieee80211_get_channel(local->hw.wiphy, freq),
+ bssid, ssid, ssid_len, 0, 0);
+ if (!cbss)
+ return NULL;
+ return (void *)cbss->priv;
}
static void ieee80211_rx_bss_free(struct cfg80211_bss *cbss)
{
- struct ieee80211_bss *bss = (void *)cbss;
+ struct ieee80211_bss *bss = (void *)cbss->priv;
kfree(bss_mesh_id(bss));
kfree(bss_mesh_cfg(bss));
void ieee80211_rx_bss_put(struct ieee80211_local *local,
struct ieee80211_bss *bss)
{
- cfg80211_put_bss((struct cfg80211_bss *)bss);
+ if (!bss)
+ return;
+ cfg80211_put_bss(container_of((void *)bss, struct cfg80211_bss, priv));
+}
+
+static bool is_uapsd_supported(struct ieee802_11_elems *elems)
+{
+ u8 qos_info;
+
+ if (elems->wmm_info && elems->wmm_info_len == 7
+ && elems->wmm_info[5] == 1)
+ qos_info = elems->wmm_info[6];
+ else if (elems->wmm_param && elems->wmm_param_len == 24
+ && elems->wmm_param[5] == 1)
+ qos_info = elems->wmm_param[6];
+ else
+ /* no valid wmm information or parameter element found */
+ return false;
+
+ return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD;
}
struct ieee80211_bss *
struct ieee80211_channel *channel,
bool beacon)
{
+ struct cfg80211_bss *cbss;
struct ieee80211_bss *bss;
int clen;
s32 signal = 0;
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);
+ cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel,
+ mgmt, len, signal, GFP_ATOMIC);
- if (!bss)
+ if (!cbss)
return NULL;
- bss->cbss.free_priv = ieee80211_rx_bss_free;
+ cbss->free_priv = ieee80211_rx_bss_free;
+ bss = (void *)cbss->priv;
/* save the ERP value so that it is available at association time */
if (elems->erp_info && elems->erp_info_len >= 1) {
bss->dtim_period = tim_ie->dtim_period;
}
- /* set default value for buggy APs */
- if (!elems->tim || bss->dtim_period == 0)
- bss->dtim_period = 1;
-
bss->supp_rates_len = 0;
if (elems->supp_rates) {
clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
}
bss->wmm_used = elems->wmm_param || elems->wmm_info;
+ bss->uapsd_supported = is_uapsd_supported(elems);
if (!beacon)
bss->last_probe_resp = jiffies;
return bss;
}
-void ieee80211_rx_bss_remove(struct ieee80211_sub_if_data *sdata, u8 *bssid,
- int freq, u8 *ssid, u8 ssid_len)
-{
- struct ieee80211_bss *bss;
- struct ieee80211_local *local = sdata->local;
-
- bss = ieee80211_rx_bss_get(local, bssid, freq, ssid, ssid_len);
- if (bss) {
- cfg80211_unlink_bss(local->hw.wiphy, (void *)bss);
- ieee80211_rx_bss_put(local, 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;
presp = ieee80211_is_probe_resp(fc);
if (presp) {
/* ignore ProbeResp to foreign address */
- if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
+ if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
return RX_DROP_MONITOR;
presp = true;
return RX_QUEUED;
}
+/* return false if no more work */
+static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
+{
+ 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++;
+ }
+ }
+
+ 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;
+}
+
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;
+
+ mutex_lock(&local->scan_mtx);
+
+ /*
+ * It's ok to abort a not-yet-running scan (that
+ * we have one at all will be verified by checking
+ * local->scan_req next), but not to complete it
+ * successfully.
+ */
+ if (WARN_ON(!local->scanning && !aborted))
+ aborted = true;
- if (WARN_ON(!local->hw_scanning && !local->sw_scanning))
+ if (WARN_ON(!local->scan_req)) {
+ mutex_unlock(&local->scan_mtx);
return;
+ }
- if (WARN_ON(!local->scan_req))
+ 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;
+ }
+
+ kfree(local->hw_scan_req);
+ local->hw_scan_req = NULL;
- if (local->scan_req != &local->int_scan_req)
+ if (local->scan_req != local->int_scan_req)
cfg80211_scan_done(local->scan_req, aborted);
local->scan_req = NULL;
+ local->scan_sdata = NULL;
- local->last_scan_completed = jiffies;
+ local->scanning = 0;
+ 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);
-
- netif_addr_unlock(local->mdev);
- netif_tx_unlock_bh(local->mdev);
-
- if (local->ops->sw_scan_complete)
- local->ops->sw_scan_complete(local_to_hw(local));
+ ieee80211_configure_filter(local);
- mutex_lock(&local->iflist_mtx);
- list_for_each_entry(sdata, &local->interfaces, list) {
- if (!netif_running(sdata->dev))
- continue;
+ drv_sw_scan_complete(local);
- /* Tell AP we're back */
- if (sdata->vif.type == NL80211_IFTYPE_STATION) {
- if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED) {
- ieee80211_send_nullfunc(local, sdata, 0);
- netif_tx_wake_all_queues(sdata->dev);
- }
- } else
- netif_tx_wake_all_queues(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_if_config(sdata,
- IEEE80211_IFCC_BEACON_ENABLED);
- }
- mutex_unlock(&local->iflist_mtx);
+ ieee80211_offchannel_return(local, true);
done:
+ ieee80211_recalc_idle(local);
ieee80211_mlme_notify_scan_completed(local);
ieee80211_ibss_notify_scan_completed(local);
ieee80211_mesh_notify_scan_completed(local);
+ ieee80211_queue_work(&local->hw, &local->work_work);
}
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_channel *chan;
- int skip, i;
- unsigned long next_delay = 0;
-
/*
- * 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:
- /* 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);
- return;
- }
- skip = 0;
- chan = local->scan_req->channels[local->scan_channel_idx];
-
- if (chan->flags & IEEE80211_CHAN_DISABLED ||
- (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
- chan->flags & IEEE80211_CHAN_NO_IBSS))
- skip = 1;
-
- if (!skip) {
- local->scan_channel = chan;
- if (ieee80211_hw_config(local,
- IEEE80211_CONF_CHANGE_CHANNEL))
- skip = 1;
- }
+ ieee80211_offchannel_stop_beaconing(local);
- /* advance state machine to next channel/band */
- local->scan_channel_idx++;
+ local->next_scan_state = SCAN_DECISION;
+ local->scan_channel_idx = 0;
- if (skip)
- break;
+ drv_flush(local, false);
- 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;
+ ieee80211_configure_filter(local);
- 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->ie, local->scan_req->ie_len);
- next_delay = IEEE80211_CHANNEL_TIME;
- break;
- }
+ ieee80211_queue_delayed_work(&local->hw,
+ &local->scan_work,
+ IEEE80211_CHANNEL_TIME);
- queue_delayed_work(local->hw.workqueue, &local->scan_work,
- next_delay);
+ return 0;
}
-int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata,
- struct cfg80211_scan_request *req)
+static int __ieee80211_start_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;
+ struct ieee80211_local *local = sdata->local;
+ int rc;
- if (local->scan_req && local->scan_req != req)
+ if (local->scan_req)
return -EBUSY;
+ if (!list_empty(&local->work_list)) {
+ /* wait for the work to finish/time out */
+ local->scan_req = req;
+ local->scan_sdata = sdata;
+ return 0;
+ }
+
+ 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;
+
+ /*
+ * After allocating local->hw_scan_req, we must
+ * go through until ieee80211_prep_hw_scan(), so
+ * anything that might be changed here and leave
+ * this function early must not go after this
+ * allocation.
+ */
+ }
+
local->scan_req = req;
+ local->scan_sdata = sdata;
- /* 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);
- /* MLME-SCAN.confirm
- * BSSDescriptionSet
- * ResultCode: SUCCESS, INVALID_PARAMETERS
+ /*
+ * 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 too many locking dependencies
+ * so that the scan completed calls have more
+ * locking freedom.
*/
- if (local->sw_scanning || local->hw_scanning) {
- if (local->scan_sdata == scan_sdata)
- return 0;
- return -EBUSY;
- }
+ ieee80211_recalc_idle(local);
+ mutex_unlock(&local->scan_mtx);
if (local->ops->hw_scan) {
- int rc;
+ WARN_ON(!ieee80211_prep_hw_scan(local));
+ rc = drv_hw_scan(local, local->hw_scan_req);
+ } else
+ rc = ieee80211_start_sw_scan(local);
- 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;
+ 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;
}
- local->sw_scanning = true;
- if (local->ops->sw_scan_start)
- local->ops->sw_scan_start(local_to_hw(local));
+ return rc;
+}
+
+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;
+ }
+ /* 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))
+ if (!ieee80211_sdata_running(sdata))
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.mgd.flags & IEEE80211_STA_ASSOCIATED) {
- netif_tx_stop_all_queues(sdata->dev);
- ieee80211_send_nullfunc(local, sdata, 1);
+ if (sdata->u.mgd.associated) {
+ associated = true;
+ break;
}
- } 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;
+ 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;
+ }
- 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);
+ *next_delay = 0;
+ return 0;
+}
- /* TODO: start scan as soon as all nullfunc frames are ACKed */
- queue_delayed_work(local->hw.workqueue, &local->scan_work,
- IEEE80211_CHANNEL_TIME);
+static void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local *local,
+ unsigned long *next_delay)
+{
+ ieee80211_offchannel_stop_station(local);
- return 0;
+ __set_bit(SCAN_OFF_CHANNEL, &local->scanning);
+
+ /*
+ * What if the nullfunc frames didn't arrive?
+ */
+ drv_flush(local, false);
+ if (local->ops->flush)
+ *next_delay = 0;
+ else
+ *next_delay = HZ / 10;
+
+ /* advance to the next channel to be scanned */
+ local->next_scan_state = SCAN_SET_CHANNEL;
}
+static void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local *local,
+ unsigned long *next_delay)
+{
+ /* switch back to the operating channel */
+ local->scan_channel = NULL;
+ ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
-int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
- struct cfg80211_scan_request *req)
+ /*
+ * Only re-enable station mode interface now; beaconing will be
+ * re-enabled once the full scan has been completed.
+ */
+ ieee80211_offchannel_return(local, false);
+
+ __clear_bit(SCAN_OFF_CHANNEL, &local->scanning);
+
+ *next_delay = HZ / 5;
+ local->next_scan_state = SCAN_DECISION;
+}
+
+static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
+ unsigned long *next_delay)
{
- struct ieee80211_local *local = sdata->local;
- struct ieee80211_if_managed *ifmgd;
+ int skip;
+ struct ieee80211_channel *chan;
- if (!req)
- return -EINVAL;
+ skip = 0;
+ chan = local->scan_req->channels[local->scan_channel_idx];
- if (local->scan_req && local->scan_req != req)
- return -EBUSY;
+ local->scan_channel = chan;
+ if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
+ skip = 1;
- local->scan_req = req;
+ /* advance state machine to next channel/band */
+ local->scan_channel_idx++;
- if (sdata->vif.type != NL80211_IFTYPE_STATION)
- return ieee80211_start_scan(sdata, req);
+ if (skip) {
+ /* if we skip this channel return to the decision state */
+ local->next_scan_state = SCAN_DECISION;
+ return;
+ }
/*
- * 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.
+ * 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;
+ }
- if (local->sw_scanning || local->hw_scanning) {
- if (local->scan_sdata == sdata)
- return 0;
- return -EBUSY;
+ /* 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);
+
+ /*
+ * 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 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;
}
- ifmgd = &sdata->u.mgd;
- set_bit(IEEE80211_STA_REQ_SCAN, &ifmgd->request);
- queue_work(local->hw.workqueue, &ifmgd->work);
+ 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;
+ }
- return 0;
+ 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;
+ }
+
+ mutex_unlock(&local->scan_mtx);
+
+ /*
+ * Avoid re-scheduling when the sdata is going away.
+ */
+ if (!ieee80211_sdata_running(sdata)) {
+ ieee80211_scan_completed(&local->hw, true);
+ return;
+ }
+
+ /*
+ * 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);
+
+ 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);
+
+ return res;
+}
+
+int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata,
+ const u8 *ssid, u8 ssid_len)
+{
+ struct ieee80211_local *local = sdata->local;
+ int ret = -EBUSY;
+
+ 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);
}