ipv4: flush route cache after change accept_local
[linux-2.6.git] / net / mac80211 / scan.c
index 41635b2..6f09eca 100644 (file)
@@ -114,6 +114,10 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
                bss->dtim_period = tim_ie->dtim_period;
        }
 
+       /* If the beacon had no TIM IE, or it was invalid, use 1 */
+       if (beacon && !bss->dtim_period)
+               bss->dtim_period = 1;
+
        /* replace old supported rates if we get new values */
        srlen = 0;
        if (elems->supp_rates) {
@@ -166,7 +170,7 @@ ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
                return RX_CONTINUE;
 
        if (skb->len < 24)
-               return RX_DROP_MONITOR;
+               return RX_CONTINUE;
 
        presp = ieee80211_is_probe_resp(fc);
        if (presp) {
@@ -192,7 +196,8 @@ ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
        ieee802_11_parse_elems(elements, skb->len - baselen, &elems);
 
        if (elems.ds_params && elems.ds_params_len == 1)
-               freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
+               freq = ieee80211_channel_to_frequency(elems.ds_params[0],
+                                                     rx_status->band);
        else
                freq = rx_status->freq;
 
@@ -207,6 +212,14 @@ ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
        if (bss)
                ieee80211_rx_bss_put(sdata->local, bss);
 
+       /* If we are on-operating-channel, and this packet is for the
+        * current channel, pass the pkt on up the stack so that
+        * the rest of the stack can make use of it.
+        */
+       if (ieee80211_cfg_on_oper_channel(sdata->local)
+           && (channel == sdata->local->oper_channel))
+               return RX_CONTINUE;
+
        dev_kfree_skb(skb);
        return RX_QUEUED;
 }
@@ -238,20 +251,21 @@ static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
        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);
+                                        req->ie, req->ie_len, band,
+                                        req->rates[band], 0);
        local->hw_scan_req->ie_len = ielen;
 
        return true;
 }
 
-void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
+static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted,
+                                      bool was_hw_scan)
 {
        struct ieee80211_local *local = hw_to_local(hw);
-       bool was_hw_scan;
-
-       trace_api_scan_completed(local, aborted);
+       bool on_oper_chan;
+       bool enable_beacons = false;
 
-       mutex_lock(&local->scan_mtx);
+       lockdep_assert_held(&local->mtx);
 
        /*
         * It's ok to abort a not-yet-running scan (that
@@ -262,17 +276,13 @@ void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
        if (WARN_ON(!local->scanning && !aborted))
                aborted = true;
 
-       if (WARN_ON(!local->scan_req)) {
-               mutex_unlock(&local->scan_mtx);
+       if (WARN_ON(!local->scan_req))
                return;
-       }
 
-       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;
+               int rc = drv_hw_scan(local, local->scan_sdata, local->hw_scan_req);
+               if (rc == 0)
+                       return;
        }
 
        kfree(local->hw_scan_req);
@@ -286,26 +296,46 @@ void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
        local->scanning = 0;
        local->scan_channel = NULL;
 
-       /* we only have to protect scan_req and hw/sw scan */
-       mutex_unlock(&local->scan_mtx);
-
-       ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
-       if (was_hw_scan)
-               goto done;
+       on_oper_chan = ieee80211_cfg_on_oper_channel(local);
 
-       ieee80211_configure_filter(local);
-
-       drv_sw_scan_complete(local);
-
-       ieee80211_offchannel_return(local, true);
+       if (was_hw_scan || !on_oper_chan)
+               ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
+       else
+               /* Set power back to normal operating levels. */
+               ieee80211_hw_config(local, 0);
+
+       if (!was_hw_scan) {
+               bool on_oper_chan2;
+               ieee80211_configure_filter(local);
+               drv_sw_scan_complete(local);
+               on_oper_chan2 = ieee80211_cfg_on_oper_channel(local);
+               /* We should always be on-channel at this point. */
+               WARN_ON(!on_oper_chan2);
+               if (on_oper_chan2 && (on_oper_chan != on_oper_chan2))
+                       enable_beacons = true;
+
+               ieee80211_offchannel_return(local, enable_beacons, 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);
 }
+
+void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
+{
+       struct ieee80211_local *local = hw_to_local(hw);
+
+       trace_api_scan_completed(local, aborted);
+
+       set_bit(SCAN_COMPLETED, &local->scanning);
+       if (aborted)
+               set_bit(SCAN_ABORTED, &local->scanning);
+       ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
+}
 EXPORT_SYMBOL(ieee80211_scan_completed);
 
 static int ieee80211_start_sw_scan(struct ieee80211_local *local)
@@ -325,16 +355,21 @@ static int ieee80211_start_sw_scan(struct ieee80211_local *local)
         */
        drv_sw_scan_start(local);
 
-       ieee80211_offchannel_stop_beaconing(local);
-
        local->leave_oper_channel_time = 0;
        local->next_scan_state = SCAN_DECISION;
        local->scan_channel_idx = 0;
 
-       drv_flush(local, false);
+       /* We always want to use off-channel PS, even if we
+        * are not really leaving oper-channel.  Don't
+        * tell the AP though, as long as we are on-channel.
+        */
+       ieee80211_offchannel_enable_all_ps(local, false);
 
        ieee80211_configure_filter(local);
 
+       /* We need to set power level at maximum rate for scanning. */
+       ieee80211_hw_config(local, 0);
+
        ieee80211_queue_delayed_work(&local->hw,
                                     &local->scan_work,
                                     IEEE80211_CHANNEL_TIME);
@@ -349,6 +384,8 @@ static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
        struct ieee80211_local *local = sdata->local;
        int rc;
 
+       lockdep_assert_held(&local->mtx);
+
        if (local->scan_req)
                return -EBUSY;
 
@@ -396,19 +433,7 @@ static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
        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 too many locking dependencies
-        * so that the scan completed calls have more
-        * locking freedom.
-        */
-
        ieee80211_recalc_idle(local);
-       mutex_unlock(&local->scan_mtx);
 
        if (local->ops->hw_scan) {
                WARN_ON(!ieee80211_prep_hw_scan(local));
@@ -416,8 +441,6 @@ static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
        } else
                rc = ieee80211_start_sw_scan(local);
 
-       mutex_lock(&local->scan_mtx);
-
        if (rc) {
                kfree(local->hw_scan_req);
                local->hw_scan_req = NULL;
@@ -444,8 +467,8 @@ ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
        return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
 }
 
-static int ieee80211_scan_state_decision(struct ieee80211_local *local,
-                                        unsigned long *next_delay)
+static void ieee80211_scan_state_decision(struct ieee80211_local *local,
+                                         unsigned long *next_delay)
 {
        bool associated = false;
        bool tx_empty = true;
@@ -455,12 +478,6 @@ static int ieee80211_scan_state_decision(struct ieee80211_local *local,
        struct ieee80211_sub_if_data *sdata;
        struct ieee80211_channel *next_chan;
 
-       /* 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,
         * check if at least one STA interface has pending tx frames
@@ -489,7 +506,20 @@ static int ieee80211_scan_state_decision(struct ieee80211_local *local,
        }
        mutex_unlock(&local->iflist_mtx);
 
-       if (local->scan_channel) {
+       next_chan = local->scan_req->channels[local->scan_channel_idx];
+
+       if (ieee80211_cfg_on_oper_channel(local)) {
+               /* We're currently on operating channel. */
+               if (next_chan == local->oper_channel)
+                       /* We don't need to move off of operating channel. */
+                       local->next_scan_state = SCAN_SET_CHANNEL;
+               else
+                       /*
+                        * We do need to leave operating channel, as next
+                        * scan is somewhere else.
+                        */
+                       local->next_scan_state = SCAN_LEAVE_OPER_CHANNEL;
+       } else {
                /*
                 * we're currently scanning a different channel, let's
                 * see if we can scan another channel without interfering
@@ -505,7 +535,6 @@ static int ieee80211_scan_state_decision(struct ieee80211_local *local,
                 *
                 * Otherwise switch back to the operating channel.
                 */
-               next_chan = local->scan_req->channels[local->scan_channel_idx];
 
                bad_latency = time_after(jiffies +
                                ieee80211_scan_get_channel_time(next_chan),
@@ -523,24 +552,18 @@ static int ieee80211_scan_state_decision(struct ieee80211_local *local,
                        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)
 {
-       ieee80211_offchannel_stop_station(local);
-
-       __set_bit(SCAN_OFF_CHANNEL, &local->scanning);
+       /* PS will already be in off-channel mode,
+        * we do that once at the beginning of scanning.
+        */
+       ieee80211_offchannel_stop_vifs(local, false);
 
        /*
         * What if the nullfunc frames didn't arrive?
@@ -563,15 +586,15 @@ static void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local *loca
 {
        /* switch back to the operating channel */
        local->scan_channel = NULL;
-       ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
+       if (!ieee80211_cfg_on_oper_channel(local))
+               ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
 
        /*
-        * Only re-enable station mode interface now; beaconing will be
-        * re-enabled once the full scan has been completed.
+        * Re-enable vifs and beaconing.  Leave PS
+        * in off-channel state..will put that back
+        * on-channel at the end of scanning.
         */
-       ieee80211_offchannel_return(local, false);
-
-       __clear_bit(SCAN_OFF_CHANNEL, &local->scanning);
+       ieee80211_offchannel_return(local, true, false);
 
        *next_delay = HZ / 5;
        local->next_scan_state = SCAN_DECISION;
@@ -587,8 +610,11 @@ static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
        chan = local->scan_req->channels[local->scan_channel_idx];
 
        local->scan_channel = chan;
-       if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
-               skip = 1;
+
+       /* Only call hw-config if we really need to change channels. */
+       if (chan != local->hw.conf.channel)
+               if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
+                       skip = 1;
 
        /* advance state machine to next channel/band */
        local->scan_channel_idx++;
@@ -626,13 +652,15 @@ static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
 {
        int i;
        struct ieee80211_sub_if_data *sdata = local->scan_sdata;
+       enum ieee80211_band band = local->hw.conf.channel->band;
 
        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);
+                       local->scan_req->ie, local->scan_req->ie_len,
+                       local->scan_req->rates[band], false);
 
        /*
         * After sending probe requests, wait for probe responses
@@ -646,23 +674,22 @@ void ieee80211_scan_work(struct work_struct *work)
 {
        struct ieee80211_local *local =
                container_of(work, struct ieee80211_local, scan_work.work);
-       struct ieee80211_sub_if_data *sdata = local->scan_sdata;
+       struct ieee80211_sub_if_data *sdata;
        unsigned long next_delay = 0;
+       bool aborted, hw_scan;
 
-       mutex_lock(&local->scan_mtx);
-       if (!sdata || !local->scan_req) {
-               mutex_unlock(&local->scan_mtx);
-               return;
-       }
+       mutex_lock(&local->mtx);
 
-       if (local->hw_scan_req) {
-               int rc = drv_hw_scan(local, sdata, local->hw_scan_req);
-               mutex_unlock(&local->scan_mtx);
-               if (rc)
-                       ieee80211_scan_completed(&local->hw, true);
-               return;
+       sdata = local->scan_sdata;
+
+       if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
+               aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
+               goto out_complete;
        }
 
+       if (!sdata || !local->scan_req)
+               goto out;
+
        if (local->scan_req && !local->scanning) {
                struct cfg80211_scan_request *req = local->scan_req;
                int rc;
@@ -671,21 +698,21 @@ void ieee80211_scan_work(struct work_struct *work)
                local->scan_sdata = NULL;
 
                rc = __ieee80211_start_scan(sdata, req);
-               mutex_unlock(&local->scan_mtx);
-
-               if (rc)
-                       ieee80211_scan_completed(&local->hw, true);
-               return;
+               if (rc) {
+                       /* need to complete scan in cfg80211 */
+                       local->scan_req = req;
+                       aborted = true;
+                       goto out_complete;
+               } else
+                       goto out;
        }
 
-       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;
+               aborted = true;
+               goto out_complete;
        }
 
        /*
@@ -693,10 +720,19 @@ void ieee80211_scan_work(struct work_struct *work)
         * without scheduling a new work
         */
        do {
+               if (!ieee80211_sdata_running(sdata)) {
+                       aborted = true;
+                       goto out_complete;
+               }
+
                switch (local->next_scan_state) {
                case SCAN_DECISION:
-                       if (ieee80211_scan_state_decision(local, &next_delay))
-                               return;
+                       /* if no more bands/channels left, complete scan */
+                       if (local->scan_channel_idx >= local->scan_req->n_channels) {
+                               aborted = false;
+                               goto out_complete;
+                       }
+                       ieee80211_scan_state_decision(local, &next_delay);
                        break;
                case SCAN_SET_CHANNEL:
                        ieee80211_scan_state_set_channel(local, &next_delay);
@@ -714,6 +750,13 @@ void ieee80211_scan_work(struct work_struct *work)
        } while (next_delay == 0);
 
        ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay);
+       goto out;
+
+out_complete:
+       hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning);
+       __ieee80211_scan_completed(&local->hw, aborted, hw_scan);
+out:
+       mutex_unlock(&local->mtx);
 }
 
 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
@@ -721,9 +764,9 @@ int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
 {
        int res;
 
-       mutex_lock(&sdata->local->scan_mtx);
+       mutex_lock(&sdata->local->mtx);
        res = __ieee80211_start_scan(sdata, req);
-       mutex_unlock(&sdata->local->scan_mtx);
+       mutex_unlock(&sdata->local->mtx);
 
        return res;
 }
@@ -736,7 +779,7 @@ int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata,
        int ret = -EBUSY;
        enum ieee80211_band band;
 
-       mutex_lock(&local->scan_mtx);
+       mutex_lock(&local->mtx);
 
        /* busy scanning */
        if (local->scan_req)
@@ -771,25 +814,171 @@ int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata,
 
        ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
  unlock:
-       mutex_unlock(&local->scan_mtx);
+       mutex_unlock(&local->mtx);
        return ret;
 }
 
+/*
+ * Only call this function when a scan can't be queued -- under RTNL.
+ */
 void ieee80211_scan_cancel(struct ieee80211_local *local)
 {
-       bool abortscan;
+       /*
+        * We are canceling software scan, or deferred scan that was not
+        * yet really started (see __ieee80211_start_scan ).
+        *
+        * Regarding hardware scan:
+        * - we can not call  __ieee80211_scan_completed() as when
+        *   SCAN_HW_SCANNING bit is set this function change
+        *   local->hw_scan_req to operate on 5G band, what race with
+        *   driver which can use local->hw_scan_req
+        *
+        * - we can not cancel scan_work since driver can schedule it
+        *   by ieee80211_scan_completed(..., true) to finish scan
+        *
+        * Hence we only call the cancel_hw_scan() callback, but the low-level
+        * driver is still responsible for calling ieee80211_scan_completed()
+        * after the scan was completed/aborted.
+        */
+
+       mutex_lock(&local->mtx);
+       if (!local->scan_req)
+               goto out;
 
-       cancel_delayed_work_sync(&local->scan_work);
+       if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
+               if (local->ops->cancel_hw_scan)
+                       drv_cancel_hw_scan(local, local->scan_sdata);
+               goto out;
+       }
 
        /*
-        * Only call this function when a scan can't be
-        * queued -- mostly at suspend under RTNL.
+        * If the work is currently running, it must be blocked on
+        * the mutex, but we'll set scan_sdata = NULL and it'll
+        * simply exit once it acquires the mutex.
         */
-       mutex_lock(&local->scan_mtx);
-       abortscan = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
-                   (!local->scanning && local->scan_req);
-       mutex_unlock(&local->scan_mtx);
+       cancel_delayed_work(&local->scan_work);
+       /* and clean up */
+       __ieee80211_scan_completed(&local->hw, true, false);
+out:
+       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 +
+                                                     req->ie_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)
+{
+       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]);
+
+               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_work(struct work_struct *work)
+{
+       struct ieee80211_local *local =
+               container_of(work, struct ieee80211_local,
+                            sched_scan_stopped_work);
+       int i;
+
+       mutex_lock(&local->mtx);
+
+       if (!local->sched_scanning) {
+               mutex_unlock(&local->mtx);
+               return;
+       }
+
+       for (i = 0; i < IEEE80211_NUM_BANDS; i++)
+               kfree(local->sched_scan_ies.ie[i]);
+
+       local->sched_scanning = false;
+
+       mutex_unlock(&local->mtx);
+
+       cfg80211_sched_scan_stopped(local->hw.wiphy);
+}
+
+void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
+{
+       struct ieee80211_local *local = hw_to_local(hw);
+
+       trace_api_sched_scan_stopped(local);
 
-       if (abortscan)
-               ieee80211_scan_completed(&local->hw, true);
+       ieee80211_queue_work(&local->hw, &local->sched_scan_stopped_work);
 }
+EXPORT_SYMBOL(ieee80211_sched_scan_stopped);