8 files changed, 292 insertions, 22 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 9e5542794b95..62a1c225b7cb 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -537,6 +537,21 @@ struct ieee80211_tx_info {
         };
 };
 
+/**
+ * ieee80211_sched_scan_ies - scheduled scan IEs
+ *
+ * This structure is used to pass the appropriate IEs to be used in scheduled
+ * scans for all bands.  It contains both the IEs passed from the userspace
+ * and the ones generated by mac80211.
+ *
+ * @ie: array with the IEs for each supported band
+ * @len: array with the total length of the IEs for each band
+ */
+struct ieee80211_sched_scan_ies {
+        u8 *ie[IEEE80211_NUM_BANDS];
+        size_t len[IEEE80211_NUM_BANDS];
+};
+
 static inline struct ieee80211_tx_info *IEEE80211_SKB_CB(struct sk_buff *skb)
 {
         return (struct ieee80211_tx_info *)skb->cb;
@@ -1693,6 +1708,13 @@ enum ieee80211_ampdu_mlme_action {
  *      any error unless this callback returned a negative error code.
  *      The callback can sleep.
  *
+ * @sched_scan_start: Ask the hardware to start scanning repeatedly at
+ *      specific intervals.  The driver must call the
+ *      ieee80211_sched_scan_results() function whenever it finds results.
+ *      This process will continue until sched_scan_stop is called.
+ *
+ * @sched_scan_stop: Tell the hardware to stop an ongoing scheduled scan.
+ *
  * @sw_scan_start: Notifier function that is called just before a software scan
  *      is started. Can be NULL, if the driver doesn't need this notification.
  *      The callback can sleep.
@@ -1877,6 +1899,12 @@ struct ieee80211_ops {
                                 u32 iv32, u16 *phase1key);
         int (*hw_scan)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
                        struct cfg80211_scan_request *req);
+        int (*sched_scan_start)(struct ieee80211_hw *hw,
+                                struct ieee80211_vif *vif,
+                                struct cfg80211_sched_scan_request *req,
+                                struct ieee80211_sched_scan_ies *ies);
+        void (*sched_scan_stop)(struct ieee80211_hw *hw,
+                               struct ieee80211_vif *vif);
         void (*sw_scan_start)(struct ieee80211_hw *hw);
         void (*sw_scan_complete)(struct ieee80211_hw *hw);
         int (*get_stats)(struct ieee80211_hw *hw,
@@ -2594,6 +2622,28 @@ void ieee80211_wake_queues(struct ieee80211_hw *hw);
 void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted);
 
 /**
+ * ieee80211_sched_scan_results - got results from scheduled scan
+ *
+ * When a scheduled scan is running, this function needs to be called by the
+ * driver whenever there are new scan results available.
+ *
+ * @hw: the hardware that is performing scheduled scans
+ */
+void ieee80211_sched_scan_results(struct ieee80211_hw *hw);
+
+/**
+ * ieee80211_sched_scan_stopped - inform that the scheduled scan has stopped
+ *
+ * When a scheduled scan is running, this function can be called by
+ * the driver if it needs to stop the scan to perform another task.
+ * Usual scenarios are drivers that cannot continue the scheduled scan
+ * while associating, for instance.
+ *
+ * @hw: the hardware that is performing scheduled scans
+ */
+void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw);
+
+/**
  * ieee80211_iterate_active_interfaces - iterate active interfaces
  *
  * This function iterates over the interfaces associated with a given
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index c416cce5e1ed..a2ff47493e0a 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1362,6 +1362,31 @@ static int ieee80211_scan(struct wiphy *wiphy,
         return ieee80211_request_scan(sdata, req);
 }
 
+static int
+ieee80211_sched_scan_start(struct wiphy *wiphy,
+                           struct net_device *dev,
+                           struct cfg80211_sched_scan_request *req)
+{
+        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+        if (!sdata->local->ops->sched_scan_start)
+                return -EOPNOTSUPP;
+
+        return ieee80211_request_sched_scan_start(sdata, req);
+}
+
+static int
+ieee80211_sched_scan_stop(struct wiphy *wiphy, struct net_device *dev,
+                          bool driver_initiated)
+{
+        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+        if (!sdata->local->ops->sched_scan_stop)
+                return -EOPNOTSUPP;
+
+        return ieee80211_request_sched_scan_stop(sdata, driver_initiated);
+}
+
 static int ieee80211_auth(struct wiphy *wiphy, struct net_device *dev,
                           struct cfg80211_auth_request *req)
 {
@@ -2103,6 +2128,8 @@ struct cfg80211_ops mac80211_config_ops = {
         .suspend = ieee80211_suspend,
         .resume = ieee80211_resume,
         .scan = ieee80211_scan,
+        .sched_scan_start = ieee80211_sched_scan_start,
+        .sched_scan_stop = ieee80211_sched_scan_stop,
         .auth = ieee80211_auth,
         .assoc = ieee80211_assoc,
         .deauth = ieee80211_deauth,
diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h
index aa16bd8ef789..eebf7a67daf7 100644
--- a/net/mac80211/driver-ops.h
+++ b/net/mac80211/driver-ops.h
@@ -212,12 +212,39 @@ static inline int drv_hw_scan(struct ieee80211_local *local,
 
         might_sleep();
 
-        trace_drv_hw_scan(local, sdata, req);
+        trace_drv_hw_scan(local, sdata);
         ret = local->ops->hw_scan(&local->hw, &sdata->vif, req);
         trace_drv_return_int(local, ret);
         return ret;
 }
 
+static inline int
+drv_sched_scan_start(struct ieee80211_local *local,
+                     struct ieee80211_sub_if_data *sdata,
+                     struct cfg80211_sched_scan_request *req,
+                     struct ieee80211_sched_scan_ies *ies)
+{
+        int ret;
+
+        might_sleep();
+
+        trace_drv_sched_scan_start(local, sdata);
+        ret = local->ops->sched_scan_start(&local->hw, &sdata->vif,
+                                              req, ies);
+        trace_drv_return_int(local, ret);
+        return ret;
+}
+
+static inline void drv_sched_scan_stop(struct ieee80211_local *local,
+                                       struct ieee80211_sub_if_data *sdata)
+{
+        might_sleep();
+
+        trace_drv_sched_scan_stop(local, sdata);
+        local->ops->sched_scan_stop(&local->hw, &sdata->vif);
+        trace_drv_return_void(local);
+}
+
 static inline void drv_sw_scan_start(struct ieee80211_local *local)
 {
         might_sleep();
diff --git a/net/mac80211/driver-trace.h b/net/mac80211/driver-trace.h
index dd9779d41d2b..ed9edcbd9aa5 100644
--- a/net/mac80211/driver-trace.h
+++ b/net/mac80211/driver-trace.h
@@ -98,6 +98,27 @@ DECLARE_EVENT_CLASS(local_u32_evt,
         )
 );
 
+DECLARE_EVENT_CLASS(local_sdata_evt,
+        TP_PROTO(struct ieee80211_local *local,
+                 struct ieee80211_sub_if_data *sdata),
+        TP_ARGS(local, sdata),
+
+        TP_STRUCT__entry(
+                LOCAL_ENTRY
+                VIF_ENTRY
+        ),
+
+        TP_fast_assign(
+                LOCAL_ASSIGN;
+                VIF_ASSIGN;
+        ),
+
+        TP_printk(
+                LOCAL_PR_FMT VIF_PR_FMT,
+                LOCAL_PR_ARG, VIF_PR_ARG
+        )
+);
+
 DEFINE_EVENT(local_only_evt, drv_return_void,
         TP_PROTO(struct ieee80211_local *local),
         TP_ARGS(local)
@@ -433,27 +454,22 @@ TRACE_EVENT(drv_update_tkip_key,
         )
 );
 
-TRACE_EVENT(drv_hw_scan,
+DEFINE_EVENT(local_sdata_evt, drv_hw_scan,
         TP_PROTO(struct ieee80211_local *local,
-                 struct ieee80211_sub_if_data *sdata,
-                 struct cfg80211_scan_request *req),
-
-        TP_ARGS(local, sdata, req),
-
-        TP_STRUCT__entry(
-                LOCAL_ENTRY
-                VIF_ENTRY
-        ),
+                 struct ieee80211_sub_if_data *sdata),
+        TP_ARGS(local, sdata)
+);
 
-        TP_fast_assign(
-                LOCAL_ASSIGN;
-                VIF_ASSIGN;
-        ),
+DEFINE_EVENT(local_sdata_evt, drv_sched_scan_start,
+        TP_PROTO(struct ieee80211_local *local,
+                 struct ieee80211_sub_if_data *sdata),
+        TP_ARGS(local, sdata)
+);
 
-        TP_printk(
-                LOCAL_PR_FMT VIF_PR_FMT,
-                LOCAL_PR_ARG,VIF_PR_ARG
-        )
+DEFINE_EVENT(local_sdata_evt, drv_sched_scan_stop,
+        TP_PROTO(struct ieee80211_local *local,
+                 struct ieee80211_sub_if_data *sdata),
+        TP_ARGS(local, sdata)
 );
 
 DEFINE_EVENT(local_only_evt, drv_sw_scan_start,
@@ -1180,6 +1196,42 @@ TRACE_EVENT(api_scan_completed,
         )
 );
 
+TRACE_EVENT(api_sched_scan_results,
+        TP_PROTO(struct ieee80211_local *local),
+
+        TP_ARGS(local),
+
+        TP_STRUCT__entry(
+                LOCAL_ENTRY
+        ),
+
+        TP_fast_assign(
+                LOCAL_ASSIGN;
+        ),
+
+        TP_printk(
+                LOCAL_PR_FMT, LOCAL_PR_ARG
+        )
+);
+
+TRACE_EVENT(api_sched_scan_stopped,
+        TP_PROTO(struct ieee80211_local *local),
+
+        TP_ARGS(local),
+
+        TP_STRUCT__entry(
+                LOCAL_ENTRY
+        ),
+
+        TP_fast_assign(
+                LOCAL_ASSIGN;
+        ),
+
+        TP_printk(
+                LOCAL_PR_FMT, LOCAL_PR_ARG
+        )
+);
+
 TRACE_EVENT(api_sta_block_awake,
         TP_PROTO(struct ieee80211_local *local,
                  struct ieee80211_sta *sta, bool block),
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 7f4d0dc1d534..6f55a789c099 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -847,6 +847,9 @@ struct ieee80211_local {
         int scan_channel_idx;
         int scan_ies_len;
 
+        bool sched_scanning;
+        struct ieee80211_sched_scan_ies sched_scan_ies;
+
         unsigned long leave_oper_channel_time;
         enum mac80211_scan_state next_scan_state;
         struct delayed_work scan_work;
@@ -1154,6 +1157,12 @@ ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
 void ieee80211_rx_bss_put(struct ieee80211_local *local,
                           struct ieee80211_bss *bss);
 
+/* scheduled scan handling */
+int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
+                                       struct cfg80211_sched_scan_request *req);
+int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata,
+                                      bool driver_initiated);
+
 /* off-channel helpers */
 bool ieee80211_cfg_on_oper_channel(struct ieee80211_local *local);
 void ieee80211_offchannel_enable_all_ps(struct ieee80211_local *local,
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index ab1f464817af..30e6a682a047 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -358,7 +358,8 @@ static void ieee80211_restart_work(struct work_struct *work)
         flush_workqueue(local->workqueue);
 
         mutex_lock(&local->mtx);
-        WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
+        WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
+             local->sched_scanning,
                 "%s called with hardware scan in progress\n", __func__);
         mutex_unlock(&local->mtx);
 
@@ -833,6 +834,9 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
         if (!local->ops->remain_on_channel)
                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 
+        if (local->ops->sched_scan_start)
+                local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
+
         result = wiphy_register(local->hw.wiphy);
         if (result < 0)
                 goto fail_wiphy_register;
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 634f3d97a279..1b9413fb3839 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -404,11 +404,13 @@ ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx)
         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
         struct sk_buff *skb = rx->skb;
 
-        if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN)))
+        if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
+                   !local->sched_scanning))
                 return RX_CONTINUE;
 
         if (test_bit(SCAN_HW_SCANNING, &local->scanning) ||
-            test_bit(SCAN_SW_SCANNING, &local->scanning))
+            test_bit(SCAN_SW_SCANNING, &local->scanning) ||
+            local->sched_scanning)
                 return ieee80211_scan_rx(rx->sdata, skb);
 
         /* scanning finished during invoking of handlers */
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 8acce724f0dc..ea44a8e941ec 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -15,6 +15,7 @@
 #include <linux/if_arp.h>
 #include <linux/rtnetlink.h>
 #include <linux/pm_qos_params.h>
+#include <linux/slab.h>
 #include <net/sch_generic.h>
 #include <linux/slab.h>
 #include <net/mac80211.h>
@@ -850,3 +851,101 @@ void ieee80211_scan_cancel(struct ieee80211_local *local)
         }
         mutex_unlock(&local->mtx);
 }
+
+int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
+                                       struct cfg80211_sched_scan_request *req)
+{
+        struct ieee80211_local *local = sdata->local;
+        int ret, i;
+
+        mutex_lock(&sdata->local->mtx);
+
+        if (local->sched_scanning) {
+                ret = -EBUSY;
+                goto out;
+        }
+
+        if (!local->ops->sched_scan_start) {
+                ret = -ENOTSUPP;
+                goto out;
+        }
+
+        for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
+                local->sched_scan_ies.ie[i] = kzalloc(2 +
+                                                      IEEE80211_MAX_SSID_LEN +
+                                                      local->scan_ies_len,
+                                                      GFP_KERNEL);
+                if (!local->sched_scan_ies.ie[i]) {
+                        ret = -ENOMEM;
+                        goto out_free;
+                }
+
+                local->sched_scan_ies.len[i] =
+                        ieee80211_build_preq_ies(local,
+                                                 local->sched_scan_ies.ie[i],
+                                                 req->ie, req->ie_len, i,
+                                                 (u32) -1, 0);
+        }
+
+        ret = drv_sched_scan_start(local, sdata, req,
+                                   &local->sched_scan_ies);
+        if (ret == 0) {
+                local->sched_scanning = true;
+                goto out;
+        }
+
+out_free:
+        while (i > 0)
+                kfree(local->sched_scan_ies.ie[--i]);
+out:
+        mutex_unlock(&sdata->local->mtx);
+        return ret;
+}
+
+int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata,
+                                      bool driver_initiated)
+{
+        struct ieee80211_local *local = sdata->local;
+        int ret = 0, i;
+
+        mutex_lock(&sdata->local->mtx);
+
+        if (!local->ops->sched_scan_stop) {
+                ret = -ENOTSUPP;
+                goto out;
+        }
+
+        if (local->sched_scanning) {
+                for (i = 0; i < IEEE80211_NUM_BANDS; i++)
+                        kfree(local->sched_scan_ies.ie[i]);
+
+                if (!driver_initiated)
+                        drv_sched_scan_stop(local, sdata);
+                local->sched_scanning = false;
+        }
+
+out:
+        mutex_unlock(&sdata->local->mtx);
+
+        return ret;
+}
+
+void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
+{
+        struct ieee80211_local *local = hw_to_local(hw);
+
+        trace_api_sched_scan_results(local);
+
+        cfg80211_sched_scan_results(hw->wiphy);
+}
+EXPORT_SYMBOL(ieee80211_sched_scan_results);
+
+void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
+{
+        struct ieee80211_local *local = hw_to_local(hw);
+
+        trace_api_sched_scan_stopped(local);
+
+        cfg80211_sched_scan_stopped(hw->wiphy);
+}
+EXPORT_SYMBOL(ieee80211_sched_scan_stopped);