1 files changed, 573 insertions, 369 deletions

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 2b890af01ba4..fbb766afe599 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1,6 +1,6 @@
 /*
  * BSS client mode implementation
- * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
+ * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
  * Copyright 2004, Instant802 Networks, Inc.
  * Copyright 2005, Devicescape Software, Inc.
  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
@@ -55,10 +55,10 @@ static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
 {
         u8 *end, *pos;
 
-        pos = bss->ies;
+        pos = bss->cbss.information_elements;
         if (pos == NULL)
                 return NULL;
-        end = pos + bss->ies_len;
+        end = pos + bss->cbss.len_information_elements;
 
         while (pos + 1 < end) {
                 if (pos + 2 + pos[1] > end)
@@ -73,7 +73,7 @@ static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
 
 static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
                                       struct ieee80211_supported_band *sband,
-                                      u64 *rates)
+                                      u32 *rates)
 {
         int i, j, count;
         *rates = 0;
@@ -93,14 +93,14 @@ static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
 }
 
 /* also used by mesh code */
-u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
+u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
                             struct ieee802_11_elems *elems,
                             enum ieee80211_band band)
 {
         struct ieee80211_supported_band *sband;
         struct ieee80211_rate *bitrates;
         size_t num_rates;
-        u64 supp_rates;
+        u32 supp_rates;
         int i, j;
         sband = local->hw.wiphy->bands[band];
 
@@ -131,6 +131,12 @@ u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
 
 /* frame sending functions */
 
+static void add_extra_ies(struct sk_buff *skb, u8 *ies, size_t ies_len)
+{
+        if (ies)
+                memcpy(skb_put(skb, ies_len), ies, ies_len);
+}
+
 /* also used by scanning code */
 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
                               u8 *ssid, size_t ssid_len)
@@ -142,7 +148,8 @@ void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
         u8 *pos, *supp_rates, *esupp_rates = NULL;
         int i;
 
-        skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
+        skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
+                            sdata->u.sta.ie_probereq_len);
         if (!skb) {
                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
                        "request\n", sdata->dev->name);
@@ -189,6 +196,9 @@ void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
                 *pos = rate->bitrate / 5;
         }
 
+        add_extra_ies(skb, sdata->u.sta.ie_probereq,
+                      sdata->u.sta.ie_probereq_len);
+
         ieee80211_tx_skb(sdata, skb, 0);
 }
 
@@ -202,7 +212,8 @@ static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
         struct ieee80211_mgmt *mgmt;
 
         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
-                            sizeof(*mgmt) + 6 + extra_len);
+                            sizeof(*mgmt) + 6 + extra_len +
+                            sdata->u.sta.ie_auth_len);
         if (!skb) {
                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
                        "frame\n", sdata->dev->name);
@@ -225,6 +236,7 @@ static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
         mgmt->u.auth.status_code = cpu_to_le16(0);
         if (extra)
                 memcpy(skb_put(skb, extra_len), extra, extra_len);
+        add_extra_ies(skb, sdata->u.sta.ie_auth, sdata->u.sta.ie_auth_len);
 
         ieee80211_tx_skb(sdata, skb, encrypt);
 }
@@ -235,17 +247,26 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
         struct ieee80211_local *local = sdata->local;
         struct sk_buff *skb;
         struct ieee80211_mgmt *mgmt;
-        u8 *pos, *ies, *ht_ie;
+        u8 *pos, *ies, *ht_ie, *e_ies;
         int i, len, count, rates_len, supp_rates_len;
         u16 capab;
         struct ieee80211_bss *bss;
         int wmm = 0;
         struct ieee80211_supported_band *sband;
-        u64 rates = 0;
+        u32 rates = 0;
+        size_t e_ies_len;
+
+        if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
+                e_ies = sdata->u.sta.ie_reassocreq;
+                e_ies_len = sdata->u.sta.ie_reassocreq_len;
+        } else {
+                e_ies = sdata->u.sta.ie_assocreq;
+                e_ies_len = sdata->u.sta.ie_assocreq_len;
+        }
 
         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
                             sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
-                            ifsta->ssid_len);
+                            ifsta->ssid_len + e_ies_len);
         if (!skb) {
                 printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
                        "frame\n", sdata->dev->name);
@@ -268,7 +289,7 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
                                    local->hw.conf.channel->center_freq,
                                    ifsta->ssid, ifsta->ssid_len);
         if (bss) {
-                if (bss->capability & WLAN_CAPABILITY_PRIVACY)
+                if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
                         capab |= WLAN_CAPABILITY_PRIVACY;
                 if (bss->wmm_used)
                         wmm = 1;
@@ -279,7 +300,7 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
                  * b-only mode) */
                 rates_len = ieee80211_compatible_rates(bss, sband, &rates);
 
-                if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
+                if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
                     (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
                         capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
 
@@ -391,10 +412,17 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
         }
 
         /* wmm support is a must to HT */
+        /*
+         * IEEE802.11n does not allow TKIP/WEP as pairwise
+         * ciphers in HT mode. We still associate in non-ht
+         * mode (11a/b/g) if any one of these ciphers is
+         * configured as pairwise.
+         */
         if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
             sband->ht_cap.ht_supported &&
             (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
-            ht_ie[1] >= sizeof(struct ieee80211_ht_info)) {
+            ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
+            (!(ifsta->flags & IEEE80211_STA_TKIP_WEP_USED))) {
                 struct ieee80211_ht_info *ht_info =
                         (struct ieee80211_ht_info *)(ht_ie + 2);
                 u16 cap = sband->ht_cap.cap;
@@ -429,6 +457,8 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
         }
 
+        add_extra_ies(skb, e_ies, e_ies_len);
+
         kfree(ifsta->assocreq_ies);
         ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
         ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
@@ -446,8 +476,19 @@ static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
         struct sk_buff *skb;
         struct ieee80211_mgmt *mgmt;
+        u8 *ies;
+        size_t ies_len;
+
+        if (stype == IEEE80211_STYPE_DEAUTH) {
+                ies = sdata->u.sta.ie_deauth;
+                ies_len = sdata->u.sta.ie_deauth_len;
+        } else {
+                ies = sdata->u.sta.ie_disassoc;
+                ies_len = sdata->u.sta.ie_disassoc_len;
+        }
 
-        skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
+        skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) +
+                            ies_len);
         if (!skb) {
                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
                        "deauth/disassoc frame\n", sdata->dev->name);
@@ -465,19 +506,55 @@ static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
         /* u.deauth.reason_code == u.disassoc.reason_code */
         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
 
+        add_extra_ies(skb, ies, ies_len);
+
+        ieee80211_tx_skb(sdata, skb, ifsta->flags & IEEE80211_STA_MFP_ENABLED);
+}
+
+void ieee80211_send_pspoll(struct ieee80211_local *local,
+                           struct ieee80211_sub_if_data *sdata)
+{
+        struct ieee80211_if_sta *ifsta = &sdata->u.sta;
+        struct ieee80211_pspoll *pspoll;
+        struct sk_buff *skb;
+        u16 fc;
+
+        skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
+        if (!skb) {
+                printk(KERN_DEBUG "%s: failed to allocate buffer for "
+                       "pspoll frame\n", sdata->dev->name);
+                return;
+        }
+        skb_reserve(skb, local->hw.extra_tx_headroom);
+
+        pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
+        memset(pspoll, 0, sizeof(*pspoll));
+        fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
+        pspoll->frame_control = cpu_to_le16(fc);
+        pspoll->aid = cpu_to_le16(ifsta->aid);
+
+        /* aid in PS-Poll has its two MSBs each set to 1 */
+        pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
+
+        memcpy(pspoll->bssid, ifsta->bssid, ETH_ALEN);
+        memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
+
         ieee80211_tx_skb(sdata, skb, 0);
+
+        return;
 }
 
 /* MLME */
 static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
-                                         struct ieee80211_bss *bss)
+                                         const size_t supp_rates_len,
+                                         const u8 *supp_rates)
 {
         struct ieee80211_local *local = sdata->local;
         int i, have_higher_than_11mbit = 0;
 
         /* cf. IEEE 802.11 9.2.12 */
-        for (i = 0; i < bss->supp_rates_len; i++)
-                if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
+        for (i = 0; i < supp_rates_len; i++)
+                if ((supp_rates[i] & 0x7f) * 5 > 110)
                         have_higher_than_11mbit = 1;
 
         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
@@ -568,6 +645,27 @@ static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
         }
 }
 
+static bool ieee80211_check_tim(struct ieee802_11_elems *elems, u16 aid)
+{
+        u8 mask;
+        u8 index, indexn1, indexn2;
+        struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;
+
+        aid &= 0x3fff;
+        index = aid / 8;
+        mask  = 1 << (aid & 7);
+
+        indexn1 = tim->bitmap_ctrl & 0xfe;
+        indexn2 = elems->tim_len + indexn1 - 4;
+
+        if (index < indexn1 || index > indexn2)
+                return false;
+
+        index -= indexn1;
+
+        return !!(tim->virtual_map[index] & mask);
+}
+
 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
                                            u16 capab, bool erp_valid, u8 erp)
 {
@@ -710,20 +808,17 @@ static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
         bss_info_changed |= BSS_CHANGED_ASSOC;
         ifsta->flags |= IEEE80211_STA_ASSOCIATED;
 
-        if (sdata->vif.type != NL80211_IFTYPE_STATION)
-                return;
-
         bss = ieee80211_rx_bss_get(local, ifsta->bssid,
                                    conf->channel->center_freq,
                                    ifsta->ssid, ifsta->ssid_len);
         if (bss) {
                 /* set timing information */
-                sdata->vif.bss_conf.beacon_int = bss->beacon_int;
-                sdata->vif.bss_conf.timestamp = bss->timestamp;
+                sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
+                sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 
                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
-                        bss->capability, bss->has_erp_value, bss->erp_value);
+                        bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 
                 ieee80211_rx_bss_put(local, bss);
         }
@@ -745,13 +840,16 @@ static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
 
         if (local->powersave) {
-                if (local->dynamic_ps_timeout > 0)
+                if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
+                    local->hw.conf.dynamic_ps_timeout > 0) {
                         mod_timer(&local->dynamic_ps_timer, jiffies +
-                                  msecs_to_jiffies(local->dynamic_ps_timeout));
-                else {
+                                  msecs_to_jiffies(
+                                        local->hw.conf.dynamic_ps_timeout));
+                } else {
+                        if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
+                                ieee80211_send_nullfunc(local, sdata, 1);
                         conf->flags |= IEEE80211_CONF_PS;
-                        ieee80211_hw_config(local,
-                                            IEEE80211_CONF_CHANGE_PS);
+                        ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
                 }
         }
 
@@ -770,6 +868,14 @@ static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
                        sdata->dev->name, ifsta->bssid);
                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
                 ieee80211_sta_send_apinfo(sdata, ifsta);
+
+                /*
+                 * Most likely AP is not in the range so remove the
+                 * bss information associated to the AP
+                 */
+                ieee80211_rx_bss_remove(sdata, ifsta->bssid,
+                                sdata->local->hw.conf.channel->center_freq,
+                                ifsta->ssid, ifsta->ssid_len);
                 return;
         }
 
@@ -801,6 +907,9 @@ static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
                        sdata->dev->name, ifsta->bssid);
                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
                 ieee80211_sta_send_apinfo(sdata, ifsta);
+                ieee80211_rx_bss_remove(sdata, ifsta->bssid,
+                                sdata->local->hw.conf.channel->center_freq,
+                                ifsta->ssid, ifsta->ssid_len);
                 return;
         }
 
@@ -843,7 +952,7 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
         netif_tx_stop_all_queues(sdata->dev);
         netif_carrier_off(sdata->dev);
 
-        ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
+        ieee80211_sta_tear_down_BA_sessions(sta);
 
         if (self_disconnected) {
                 if (deauth)
@@ -863,14 +972,19 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 
         ieee80211_sta_send_apinfo(sdata, ifsta);
 
-        if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT)
+        if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
+                ieee80211_rx_bss_remove(sdata, ifsta->bssid,
+                                sdata->local->hw.conf.channel->center_freq,
+                                ifsta->ssid, ifsta->ssid_len);
+        }
 
         rcu_read_unlock();
 
-        local->hw.conf.ht.enabled = false;
+        /* channel(_type) changes are handled by ieee80211_hw_config */
         local->oper_channel_type = NL80211_CHAN_NO_HT;
-        config_changed |= IEEE80211_CONF_CHANGE_HT;
+
+        local->power_constr_level = 0;
 
         del_timer_sync(&local->dynamic_ps_timer);
         cancel_work_sync(&local->dynamic_ps_enable_work);
@@ -924,7 +1038,7 @@ static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
         if (!bss)
                 return 0;
 
-        bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
+        bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
         wep_privacy = !!ieee80211_sta_wep_configured(sdata);
         privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
 
@@ -946,6 +1060,9 @@ static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
                        sdata->dev->name, ifsta->bssid);
                 ifsta->state = IEEE80211_STA_MLME_DISABLED;
                 ieee80211_sta_send_apinfo(sdata, ifsta);
+                ieee80211_rx_bss_remove(sdata, ifsta->bssid,
+                                sdata->local->hw.conf.channel->center_freq,
+                                ifsta->ssid, ifsta->ssid_len);
                 return;
         }
 
@@ -1049,6 +1166,30 @@ static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
                             elems.challenge_len + 2, 1);
 }
 
+static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
+                                        struct ieee80211_if_sta *ifsta,
+                                        struct ieee80211_mgmt *mgmt,
+                                        size_t len)
+{
+        u16 auth_alg, auth_transaction, status_code;
+
+        if (len < 24 + 6)
+                return;
+
+        auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
+        auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
+        status_code = le16_to_cpu(mgmt->u.auth.status_code);
+
+        /*
+         * IEEE 802.11 standard does not require authentication in IBSS
+         * networks and most implementations do not seem to use it.
+         * However, try to reply to authentication attempts if someone
+         * has actually implemented this.
+         */
+        if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1)
+                ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
+}
+
 static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
                                    struct ieee80211_if_sta *ifsta,
                                    struct ieee80211_mgmt *mgmt,
@@ -1056,37 +1197,22 @@ static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
 {
         u16 auth_alg, auth_transaction, status_code;
 
-        if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
-            sdata->vif.type != NL80211_IFTYPE_ADHOC)
+        if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE)
                 return;
 
         if (len < 24 + 6)
                 return;
 
-        if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
-            memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
+        if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
                 return;
 
-        if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
-            memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
+        if (memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
                 return;
 
         auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
         auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
         status_code = le16_to_cpu(mgmt->u.auth.status_code);
 
-        if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
-                /*
-                 * IEEE 802.11 standard does not require authentication in IBSS
-                 * networks and most implementations do not seem to use it.
-                 * However, try to reply to authentication attempts if someone
-                 * has actually implemented this.
-                 */
-                if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
-                        return;
-                ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
-        }
-
         if (auth_alg != ifsta->auth_alg ||
             auth_transaction != ifsta->auth_transaction)
                 return;
@@ -1211,7 +1337,7 @@ static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
         struct ieee80211_local *local = sdata->local;
         struct ieee80211_supported_band *sband;
         struct sta_info *sta;
-        u64 rates, basic_rates;
+        u32 rates, basic_rates;
         u16 capab_info, status_code, aid;
         struct ieee802_11_elems elems;
         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
@@ -1242,6 +1368,24 @@ static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
                sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
                capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
 
+        pos = mgmt->u.assoc_resp.variable;
+        ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
+
+        if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
+            elems.timeout_int && elems.timeout_int_len == 5 &&
+            elems.timeout_int[0] == WLAN_TIMEOUT_ASSOC_COMEBACK) {
+                u32 tu, ms;
+                tu = get_unaligned_le32(elems.timeout_int + 1);
+                ms = tu * 1024 / 1000;
+                printk(KERN_DEBUG "%s: AP rejected association temporarily; "
+                       "comeback duration %u TU (%u ms)\n",
+                       sdata->dev->name, tu, ms);
+                if (ms > IEEE80211_ASSOC_TIMEOUT)
+                        mod_timer(&ifsta->timer,
+                                  jiffies + msecs_to_jiffies(ms));
+                return;
+        }
+
         if (status_code != WLAN_STATUS_SUCCESS) {
                 printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
                        sdata->dev->name, status_code);
@@ -1257,9 +1401,6 @@ static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
                        "set\n", sdata->dev->name, aid);
         aid &= ~(BIT(15) | BIT(14));
 
-        pos = mgmt->u.assoc_resp.variable;
-        ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
-
         if (!elems.supp_rates) {
                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
                        sdata->dev->name);
@@ -1281,8 +1422,6 @@ static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
         /* Add STA entry for the AP */
         sta = sta_info_get(local, ifsta->bssid);
         if (!sta) {
-                struct ieee80211_bss *bss;
-
                 newsta = true;
 
                 sta = sta_info_alloc(sdata, ifsta->bssid, GFP_ATOMIC);
@@ -1292,15 +1431,6 @@ static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
                         rcu_read_unlock();
                         return;
                 }
-                bss = ieee80211_rx_bss_get(local, ifsta->bssid,
-                                           local->hw.conf.channel->center_freq,
-                                           ifsta->ssid, ifsta->ssid_len);
-                if (bss) {
-                        sta->last_signal = bss->signal;
-                        sta->last_qual = bss->qual;
-                        sta->last_noise = bss->noise;
-                        ieee80211_rx_bss_put(local, bss);
-                }
 
                 /* update new sta with its last rx activity */
                 sta->last_rx = jiffies;
@@ -1375,6 +1505,9 @@ static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
 
         rate_control_rate_init(sta);
 
+        if (ifsta->flags & IEEE80211_STA_MFP_ENABLED)
+                set_sta_flags(sta, WLAN_STA_MFP);
+
         if (elems.wmm_param)
                 set_sta_flags(sta, WLAN_STA_WME);
 
@@ -1409,49 +1542,61 @@ static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
 }
 
 
-static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
-                                   struct ieee80211_if_sta *ifsta,
-                                   struct ieee80211_bss *bss)
+static int __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
+                                     struct ieee80211_if_sta *ifsta,
+                                     const u8 *bssid, const int beacon_int,
+                                     const int freq,
+                                     const size_t supp_rates_len,
+                                     const u8 *supp_rates,
+                                     const u16 capability)
 {
         struct ieee80211_local *local = sdata->local;
-        int res, rates, i, j;
+        int res = 0, rates, i, j;
         struct sk_buff *skb;
         struct ieee80211_mgmt *mgmt;
         u8 *pos;
         struct ieee80211_supported_band *sband;
         union iwreq_data wrqu;
 
-        skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400);
+        if (local->ops->reset_tsf) {
+                /* Reset own TSF to allow time synchronization work. */
+                local->ops->reset_tsf(local_to_hw(local));
+        }
+
+        if ((ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) &&
+           memcmp(ifsta->bssid, bssid, ETH_ALEN) == 0)
+                return res;
+
+        skb = dev_alloc_skb(local->hw.extra_tx_headroom + 400 +
+                            sdata->u.sta.ie_proberesp_len);
         if (!skb) {
                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
                        "response\n", sdata->dev->name);
                 return -ENOMEM;
         }
 
-        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
-
-        /* Remove possible STA entries from other IBSS networks. */
-        sta_info_flush_delayed(sdata);
-
-        if (local->ops->reset_tsf) {
-                /* Reset own TSF to allow time synchronization work. */
-                local->ops->reset_tsf(local_to_hw(local));
+        if (!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) {
+                /* Remove possible STA entries from other IBSS networks. */
+                sta_info_flush_delayed(sdata);
         }
-        memcpy(ifsta->bssid, bss->bssid, ETH_ALEN);
+
+        memcpy(ifsta->bssid, bssid, ETH_ALEN);
         res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
         if (res)
                 return res;
 
-        local->hw.conf.beacon_int = bss->beacon_int >= 10 ? bss->beacon_int : 10;
+        local->hw.conf.beacon_int = beacon_int >= 10 ? beacon_int : 10;
 
-        sdata->drop_unencrypted = bss->capability &
+        sdata->drop_unencrypted = capability &
                 WLAN_CAPABILITY_PRIVACY ? 1 : 0;
 
-        res = ieee80211_set_freq(sdata, bss->freq);
+        res = ieee80211_set_freq(sdata, freq);
 
         if (res)
                 return res;
 
+        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
+
         /* Build IBSS probe response */
 
         skb_reserve(skb, local->hw.extra_tx_headroom);
@@ -1460,33 +1605,32 @@ static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
                 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
         memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
-                                                IEEE80211_STYPE_PROBE_RESP);
+                                          IEEE80211_STYPE_PROBE_RESP);
         memset(mgmt->da, 0xff, ETH_ALEN);
         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
         memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
         mgmt->u.beacon.beacon_int =
                 cpu_to_le16(local->hw.conf.beacon_int);
-        mgmt->u.beacon.timestamp = cpu_to_le64(bss->timestamp);
-        mgmt->u.beacon.capab_info = cpu_to_le16(bss->capability);
+        mgmt->u.beacon.capab_info = cpu_to_le16(capability);
 
         pos = skb_put(skb, 2 + ifsta->ssid_len);
         *pos++ = WLAN_EID_SSID;
         *pos++ = ifsta->ssid_len;
         memcpy(pos, ifsta->ssid, ifsta->ssid_len);
 
-        rates = bss->supp_rates_len;
+        rates = supp_rates_len;
         if (rates > 8)
                 rates = 8;
         pos = skb_put(skb, 2 + rates);
         *pos++ = WLAN_EID_SUPP_RATES;
         *pos++ = rates;
-        memcpy(pos, bss->supp_rates, rates);
+        memcpy(pos, supp_rates, rates);
 
-        if (bss->band == IEEE80211_BAND_2GHZ) {
+        if (sband->band == IEEE80211_BAND_2GHZ) {
                 pos = skb_put(skb, 2 + 1);
                 *pos++ = WLAN_EID_DS_PARAMS;
                 *pos++ = 1;
-                *pos++ = ieee80211_frequency_to_channel(bss->freq);
+                *pos++ = ieee80211_frequency_to_channel(freq);
         }
 
         pos = skb_put(skb, 2 + 2);
@@ -1496,43 +1640,59 @@ static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
         *pos++ = 0;
         *pos++ = 0;
 
-        if (bss->supp_rates_len > 8) {
-                rates = bss->supp_rates_len - 8;
+        if (supp_rates_len > 8) {
+                rates = supp_rates_len - 8;
                 pos = skb_put(skb, 2 + rates);
                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
                 *pos++ = rates;
-                memcpy(pos, &bss->supp_rates[8], rates);
+                memcpy(pos, &supp_rates[8], rates);
         }
 
+        add_extra_ies(skb, sdata->u.sta.ie_proberesp,
+                      sdata->u.sta.ie_proberesp_len);
+
         ifsta->probe_resp = skb;
 
-        ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON);
+        ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON |
+                                   IEEE80211_IFCC_BEACON_ENABLED);
 
 
         rates = 0;
-        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
-        for (i = 0; i < bss->supp_rates_len; i++) {
-                int bitrate = (bss->supp_rates[i] & 0x7f) * 5;
+        for (i = 0; i < supp_rates_len; i++) {
+                int bitrate = (supp_rates[i] & 0x7f) * 5;
                 for (j = 0; j < sband->n_bitrates; j++)
                         if (sband->bitrates[j].bitrate == bitrate)
                                 rates |= BIT(j);
         }
         ifsta->supp_rates_bits[local->hw.conf.channel->band] = rates;
 
-        ieee80211_sta_def_wmm_params(sdata, bss);
+        ieee80211_sta_def_wmm_params(sdata, supp_rates_len, supp_rates);
 
+        ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
         ifsta->state = IEEE80211_STA_MLME_IBSS_JOINED;
         mod_timer(&ifsta->timer, jiffies + IEEE80211_IBSS_MERGE_INTERVAL);
 
         ieee80211_led_assoc(local, true);
 
         memset(&wrqu, 0, sizeof(wrqu));
-        memcpy(wrqu.ap_addr.sa_data, bss->bssid, ETH_ALEN);
+        memcpy(wrqu.ap_addr.sa_data, bssid, ETH_ALEN);
         wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
 
         return res;
 }
 
+static int ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
+                                   struct ieee80211_if_sta *ifsta,
+                                   struct ieee80211_bss *bss)
+{
+        return __ieee80211_sta_join_ibss(sdata, ifsta,
+                                         bss->cbss.bssid,
+                                         bss->cbss.beacon_interval,
+                                         bss->cbss.channel->center_freq,
+                                         bss->supp_rates_len, bss->supp_rates,
+                                         bss->cbss.capability);
+}
+
 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
                                   struct ieee80211_mgmt *mgmt,
                                   size_t len,
@@ -1546,7 +1706,7 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
         struct sta_info *sta;
         struct ieee80211_channel *channel;
         u64 beacon_timestamp, rx_timestamp;
-        u64 supp_rates = 0;
+        u32 supp_rates = 0;
         enum ieee80211_band band = rx_status->band;
 
         if (elems->ds_params && elems->ds_params_len == 1)
@@ -1567,7 +1727,7 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
 
                 sta = sta_info_get(local, mgmt->sa);
                 if (sta) {
-                        u64 prev_rates;
+                        u32 prev_rates;
 
                         prev_rates = sta->sta.supp_rates[band];
                         /* make sure mandatory rates are always added */
@@ -1593,80 +1753,99 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
         }
 
         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
-                                        freq, beacon);
+                                        channel, beacon);
         if (!bss)
                 return;
 
+        if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
+            (memcmp(mgmt->bssid, sdata->u.sta.bssid, ETH_ALEN) == 0)) {
+                struct ieee80211_channel_sw_ie *sw_elem =
+                        (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
+                ieee80211_process_chanswitch(sdata, sw_elem, bss);
+        }
+
         /* was just updated in ieee80211_bss_info_update */
-        beacon_timestamp = bss->timestamp;
+        beacon_timestamp = bss->cbss.tsf;
 
-        /*
-         * In STA mode, the remaining parameters should not be overridden
-         * by beacons because they're not necessarily accurate there.
-         */
-        if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
-            bss->last_probe_resp && beacon) {
-                ieee80211_rx_bss_put(local, bss);
-                return;
-        }
+        if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
+                goto put_bss;
 
         /* check if we need to merge IBSS */
-        if (sdata->vif.type == NL80211_IFTYPE_ADHOC && beacon &&
-            bss->capability & WLAN_CAPABILITY_IBSS &&
-            bss->freq == local->oper_channel->center_freq &&
-            elems->ssid_len == sdata->u.sta.ssid_len &&
+
+        /* merge only on beacons (???) */
+        if (!beacon)
+                goto put_bss;
+
+        /* we use a fixed BSSID */
+        if (sdata->u.sta.flags & IEEE80211_STA_BSSID_SET)
+                goto put_bss;
+
+        /* not an IBSS */
+        if (!(bss->cbss.capability & WLAN_CAPABILITY_IBSS))
+                goto put_bss;
+
+        /* different channel */
+        if (bss->cbss.channel != local->oper_channel)
+                goto put_bss;
+
+        /* different SSID */
+        if (elems->ssid_len != sdata->u.sta.ssid_len ||
             memcmp(elems->ssid, sdata->u.sta.ssid,
-                                sdata->u.sta.ssid_len) == 0) {
-                if (rx_status->flag & RX_FLAG_TSFT) {
-                        /* in order for correct IBSS merging we need mactime
-                         *
-                         * since mactime is defined as the time the first data
-                         * symbol of the frame hits the PHY, and the timestamp
-                         * of the beacon is defined as "the time that the data
-                         * symbol containing the first bit of the timestamp is
-                         * transmitted to the PHY plus the transmitting STA’s
-                         * delays through its local PHY from the MAC-PHY
-                         * interface to its interface with the WM"
-                         * (802.11 11.1.2) - equals the time this bit arrives at
-                         * the receiver - we have to take into account the
-                         * offset between the two.
-                         * e.g: at 1 MBit that means mactime is 192 usec earlier
-                         * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
-                         */
-                        int rate;
-                        if (rx_status->flag & RX_FLAG_HT) {
-                                rate = 65; /* TODO: HT rates */
-                        } else {
-                                rate = local->hw.wiphy->bands[band]->
-                                        bitrates[rx_status->rate_idx].bitrate;
-                        }
-                        rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
-                } else if (local && local->ops && local->ops->get_tsf)
-                        /* second best option: get current TSF */
-                        rx_timestamp = local->ops->get_tsf(local_to_hw(local));
+                                sdata->u.sta.ssid_len))
+                goto put_bss;
+
+        if (rx_status->flag & RX_FLAG_TSFT) {
+                /*
+                 * For correct IBSS merging we need mactime; since mactime is
+                 * defined as the time the first data symbol of the frame hits
+                 * the PHY, and the timestamp of the beacon is defined as "the
+                 * time that the data symbol containing the first bit of the
+                 * timestamp is transmitted to the PHY plus the transmitting
+                 * STA's delays through its local PHY from the MAC-PHY
+                 * interface to its interface with the WM" (802.11 11.1.2)
+                 * - equals the time this bit arrives at the receiver - we have
+                 * to take into account the offset between the two.
+                 *
+                 * E.g. at 1 MBit that means mactime is 192 usec earlier
+                 * (=24 bytes * 8 usecs/byte) than the beacon timestamp.
+                 */
+                int rate;
+
+                if (rx_status->flag & RX_FLAG_HT)
+                        rate = 65; /* TODO: HT rates */
                 else
-                        /* can't merge without knowing the TSF */
-                        rx_timestamp = -1LLU;
+                        rate = local->hw.wiphy->bands[band]->
+                                bitrates[rx_status->rate_idx].bitrate;
+
+                rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate);
+        } else if (local && local->ops && local->ops->get_tsf)
+                /* second best option: get current TSF */
+                rx_timestamp = local->ops->get_tsf(local_to_hw(local));
+        else
+                /* can't merge without knowing the TSF */
+                rx_timestamp = -1LLU;
+
 #ifdef CONFIG_MAC80211_IBSS_DEBUG
-                printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
-                       "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
-                       mgmt->sa, mgmt->bssid,
-                       (unsigned long long)rx_timestamp,
-                       (unsigned long long)beacon_timestamp,
-                       (unsigned long long)(rx_timestamp - beacon_timestamp),
-                       jiffies);
-#endif /* CONFIG_MAC80211_IBSS_DEBUG */
-                if (beacon_timestamp > rx_timestamp) {
+        printk(KERN_DEBUG "RX beacon SA=%pM BSSID="
+               "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n",
+               mgmt->sa, mgmt->bssid,
+               (unsigned long long)rx_timestamp,
+               (unsigned long long)beacon_timestamp,
+               (unsigned long long)(rx_timestamp - beacon_timestamp),
+               jiffies);
+#endif
+
+        if (beacon_timestamp > rx_timestamp) {
 #ifdef CONFIG_MAC80211_IBSS_DEBUG
-                        printk(KERN_DEBUG "%s: beacon TSF higher than "
-                               "local TSF - IBSS merge with BSSID %pM\n",
-                               sdata->dev->name, mgmt->bssid);
+                printk(KERN_DEBUG "%s: beacon TSF higher than "
+                       "local TSF - IBSS merge with BSSID %pM\n",
+                       sdata->dev->name, mgmt->bssid);
 #endif
-                        ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
-                        ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
-                }
+                ieee80211_sta_join_ibss(sdata, &sdata->u.sta, bss);
+                ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates);
         }
 
+ put_bss:
         ieee80211_rx_bss_put(local, bss);
 }
 
@@ -1712,7 +1891,7 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
         struct ieee802_11_elems elems;
         struct ieee80211_local *local = sdata->local;
         u32 changed = 0;
-        bool erp_valid;
+        bool erp_valid, directed_tim;
         u8 erp_value = 0;
 
         /* Process beacon from the current BSS */
@@ -1732,9 +1911,37 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
             memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
                 return;
 
+        if (rx_status->freq != local->hw.conf.channel->center_freq)
+                return;
+
         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
                                  elems.wmm_param_len);
 
+        if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK &&
+            local->hw.conf.flags & IEEE80211_CONF_PS) {
+                directed_tim = ieee80211_check_tim(&elems, ifsta->aid);
+
+                if (directed_tim) {
+                        if (local->hw.conf.dynamic_ps_timeout > 0) {
+                                local->hw.conf.flags &= ~IEEE80211_CONF_PS;
+                                ieee80211_hw_config(local,
+                                                    IEEE80211_CONF_CHANGE_PS);
+                                ieee80211_send_nullfunc(local, sdata, 0);
+                        } else {
+                                local->pspolling = true;
+
+                                /*
+                                 * Here is assumed that the driver will be
+                                 * able to send ps-poll frame and receive a
+                                 * response even though power save mode is
+                                 * enabled, but some drivers might require
+                                 * to disable power save here. This needs
+                                 * to be investigated.
+                                 */
+                                ieee80211_send_pspoll(local, sdata);
+                        }
+                }
+        }
 
         if (elems.erp_info && elems.erp_info_len >= 1) {
                 erp_valid = true;
@@ -1778,6 +1985,13 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
                  * for the BSSID we are associated to */
                 regulatory_hint_11d(local->hw.wiphy,
                         elems.country_elem, elems.country_elem_len);
+
+                /* TODO: IBSS also needs this */
+                if (elems.pwr_constr_elem)
+                        ieee80211_handle_pwr_constr(sdata,
+                                le16_to_cpu(mgmt->u.probe_resp.capab_info),
+                                elems.pwr_constr_elem,
+                                elems.pwr_constr_elem_len);
         }
 
         ieee80211_bss_info_change_notify(sdata, changed);
@@ -1787,8 +2001,7 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
                                         struct ieee80211_if_sta *ifsta,
                                         struct ieee80211_mgmt *mgmt,
-                                        size_t len,
-                                        struct ieee80211_rx_status *rx_status)
+                                        size_t len)
 {
         struct ieee80211_local *local = sdata->local;
         int tx_last_beacon;
@@ -1796,8 +2009,7 @@ static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
         struct ieee80211_mgmt *resp;
         u8 *pos, *end;
 
-        if (sdata->vif.type != NL80211_IFTYPE_ADHOC ||
-            ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
+        if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED ||
             len < 24 + 2 || !ifsta->probe_resp)
                 return;
 
@@ -1901,32 +2113,54 @@ static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
         mgmt = (struct ieee80211_mgmt *) skb->data;
         fc = le16_to_cpu(mgmt->frame_control);
 
-        switch (fc & IEEE80211_FCTL_STYPE) {
-        case IEEE80211_STYPE_PROBE_REQ:
-                ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt, skb->len,
-                                            rx_status);
-                break;
-        case IEEE80211_STYPE_PROBE_RESP:
-                ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len, rx_status);
-                break;
-        case IEEE80211_STYPE_BEACON:
-                ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
-                break;
-        case IEEE80211_STYPE_AUTH:
-                ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
-                break;
-        case IEEE80211_STYPE_ASSOC_RESP:
-                ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 0);
-                break;
-        case IEEE80211_STYPE_REASSOC_RESP:
-                ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt, skb->len, 1);
-                break;
-        case IEEE80211_STYPE_DEAUTH:
-                ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
-                break;
-        case IEEE80211_STYPE_DISASSOC:
-                ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt, skb->len);
-                break;
+        if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
+                switch (fc & IEEE80211_FCTL_STYPE) {
+                case IEEE80211_STYPE_PROBE_REQ:
+                        ieee80211_rx_mgmt_probe_req(sdata, ifsta, mgmt,
+                                                    skb->len);
+                        break;
+                case IEEE80211_STYPE_PROBE_RESP:
+                        ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
+                                                     rx_status);
+                        break;
+                case IEEE80211_STYPE_BEACON:
+                        ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
+                                                 rx_status);
+                        break;
+                case IEEE80211_STYPE_AUTH:
+                        ieee80211_rx_mgmt_auth_ibss(sdata, ifsta, mgmt,
+                                                    skb->len);
+                        break;
+                }
+        } else { /* NL80211_IFTYPE_STATION */
+                switch (fc & IEEE80211_FCTL_STYPE) {
+                case IEEE80211_STYPE_PROBE_RESP:
+                        ieee80211_rx_mgmt_probe_resp(sdata, mgmt, skb->len,
+                                                     rx_status);
+                        break;
+                case IEEE80211_STYPE_BEACON:
+                        ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
+                                                 rx_status);
+                        break;
+                case IEEE80211_STYPE_AUTH:
+                        ieee80211_rx_mgmt_auth(sdata, ifsta, mgmt, skb->len);
+                        break;
+                case IEEE80211_STYPE_ASSOC_RESP:
+                        ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt,
+                                                     skb->len, 0);
+                        break;
+                case IEEE80211_STYPE_REASSOC_RESP:
+                        ieee80211_rx_mgmt_assoc_resp(sdata, ifsta, mgmt,
+                                                     skb->len, 1);
+                        break;
+                case IEEE80211_STYPE_DEAUTH:
+                        ieee80211_rx_mgmt_deauth(sdata, ifsta, mgmt, skb->len);
+                        break;
+                case IEEE80211_STYPE_DISASSOC:
+                        ieee80211_rx_mgmt_disassoc(sdata, ifsta, mgmt,
+                                                   skb->len);
+                        break;
+                }
         }
 
         kfree_skb(skb);
@@ -1965,9 +2199,21 @@ static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata,
         if (ieee80211_sta_active_ibss(sdata))
                 return;
 
+        if ((sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) &&
+            (!(sdata->u.sta.flags & IEEE80211_STA_AUTO_CHANNEL_SEL)))
+                return;
+
         printk(KERN_DEBUG "%s: No active IBSS STAs - trying to scan for other "
                "IBSS networks with same SSID (merge)\n", sdata->dev->name);
-        ieee80211_request_scan(sdata, ifsta->ssid, ifsta->ssid_len);
+
+        /* XXX maybe racy? */
+        if (sdata->local->scan_req)
+                return;
+
+        memcpy(sdata->local->int_scan_req.ssids[0].ssid,
+               ifsta->ssid, IEEE80211_MAX_SSID_LEN);
+        sdata->local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
+        ieee80211_request_scan(sdata, &sdata->local->int_scan_req);
 }
 
 
@@ -2013,94 +2259,56 @@ static void ieee80211_sta_reset_auth(struct ieee80211_sub_if_data *sdata,
         netif_carrier_off(sdata->dev);
 }
 
-
-static int ieee80211_sta_match_ssid(struct ieee80211_if_sta *ifsta,
-                                    const char *ssid, int ssid_len)
-{
-        int tmp, hidden_ssid;
-
-        if (ssid_len == ifsta->ssid_len &&
-            !memcmp(ifsta->ssid, ssid, ssid_len))
-                return 1;
-
-        if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
-                return 0;
-
-        hidden_ssid = 1;
-        tmp = ssid_len;
-        while (tmp--) {
-                if (ssid[tmp] != '\0') {
-                        hidden_ssid = 0;
-                        break;
-                }
-        }
-
-        if (hidden_ssid && (ifsta->ssid_len == ssid_len || ssid_len == 0))
-                return 1;
-
-        if (ssid_len == 1 && ssid[0] == ' ')
-                return 1;
-
-        return 0;
-}
-
 static int ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata,
                                      struct ieee80211_if_sta *ifsta)
 {
         struct ieee80211_local *local = sdata->local;
-        struct ieee80211_bss *bss;
         struct ieee80211_supported_band *sband;
-        u8 bssid[ETH_ALEN], *pos;
+        u8 *pos;
+        u8 bssid[ETH_ALEN];
+        u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
+        u16 capability;
         int i;
-        int ret;
-
-#if 0
-        /* Easier testing, use fixed BSSID. */
-        memset(bssid, 0xfe, ETH_ALEN);
-#else
-        /* Generate random, not broadcast, locally administered BSSID. Mix in
-         * own MAC address to make sure that devices that do not have proper
-         * random number generator get different BSSID. */
-        get_random_bytes(bssid, ETH_ALEN);
-        for (i = 0; i < ETH_ALEN; i++)
-                bssid[i] ^= sdata->dev->dev_addr[i];
-        bssid[0] &= ~0x01;
-        bssid[0] |= 0x02;
-#endif
+
+        if (sdata->u.sta.flags & IEEE80211_STA_BSSID_SET) {
+                memcpy(bssid, ifsta->bssid, ETH_ALEN);
+        } else {
+                /* Generate random, not broadcast, locally administered BSSID. Mix in
+                 * own MAC address to make sure that devices that do not have proper
+                 * random number generator get different BSSID. */
+                get_random_bytes(bssid, ETH_ALEN);
+                for (i = 0; i < ETH_ALEN; i++)
+                        bssid[i] ^= sdata->dev->dev_addr[i];
+                bssid[0] &= ~0x01;
+                bssid[0] |= 0x02;
+        }
 
         printk(KERN_DEBUG "%s: Creating new IBSS network, BSSID %pM\n",
                sdata->dev->name, bssid);
 
-        bss = ieee80211_rx_bss_add(local, bssid,
-                                   local->hw.conf.channel->center_freq,
-                                   sdata->u.sta.ssid, sdata->u.sta.ssid_len);
-        if (!bss)
-                return -ENOMEM;
-
-        bss->band = local->hw.conf.channel->band;
-        sband = local->hw.wiphy->bands[bss->band];
+        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 
         if (local->hw.conf.beacon_int == 0)
                 local->hw.conf.beacon_int = 100;
-        bss->beacon_int = local->hw.conf.beacon_int;
-        bss->last_update = jiffies;
-        bss->capability = WLAN_CAPABILITY_IBSS;
+
+        capability = WLAN_CAPABILITY_IBSS;
 
         if (sdata->default_key)
-                bss->capability |= WLAN_CAPABILITY_PRIVACY;
+                capability |= WLAN_CAPABILITY_PRIVACY;
         else
                 sdata->drop_unencrypted = 0;
 
-        bss->supp_rates_len = sband->n_bitrates;
-        pos = bss->supp_rates;
+        pos = supp_rates;
         for (i = 0; i < sband->n_bitrates; i++) {
                 int rate = sband->bitrates[i].bitrate;
                 *pos++ = (u8) (rate / 5);
         }
 
-        ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
-        ieee80211_rx_bss_put(local, bss);
-        return ret;
+        return __ieee80211_sta_join_ibss(sdata, ifsta,
+                                         bssid, local->hw.conf.beacon_int,
+                                         local->hw.conf.channel->center_freq,
+                                         sband->n_bitrates, supp_rates,
+                                         capability);
 }
 
 
@@ -2109,8 +2317,6 @@ static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
 {
         struct ieee80211_local *local = sdata->local;
         struct ieee80211_bss *bss;
-        int found = 0;
-        u8 bssid[ETH_ALEN];
         int active_ibss;
 
         if (ifsta->ssid_len == 0)
@@ -2121,51 +2327,39 @@ static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
         printk(KERN_DEBUG "%s: sta_find_ibss (active_ibss=%d)\n",
                sdata->dev->name, active_ibss);
 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
-        spin_lock_bh(&local->bss_lock);
-        list_for_each_entry(bss, &local->bss_list, list) {
-                if (ifsta->ssid_len != bss->ssid_len ||
-                    memcmp(ifsta->ssid, bss->ssid, bss->ssid_len) != 0
-                    || !(bss->capability & WLAN_CAPABILITY_IBSS))
-                        continue;
-#ifdef CONFIG_MAC80211_IBSS_DEBUG
-                printk(KERN_DEBUG "   bssid=%pM found\n", bss->bssid);
-#endif /* CONFIG_MAC80211_IBSS_DEBUG */
-                memcpy(bssid, bss->bssid, ETH_ALEN);
-                found = 1;
-                if (active_ibss || memcmp(bssid, ifsta->bssid, ETH_ALEN) != 0)
-                        break;
-        }
-        spin_unlock_bh(&local->bss_lock);
+
+        if (active_ibss)
+                return 0;
+
+        if (ifsta->flags & IEEE80211_STA_BSSID_SET)
+                bss = ieee80211_rx_bss_get(local, ifsta->bssid, 0,
+                                           ifsta->ssid, ifsta->ssid_len);
+        else
+                bss = (void *)cfg80211_get_ibss(local->hw.wiphy,
+                                                NULL,
+                                                ifsta->ssid, ifsta->ssid_len);
 
 #ifdef CONFIG_MAC80211_IBSS_DEBUG
-        if (found)
+        if (bss)
                 printk(KERN_DEBUG "   sta_find_ibss: selected %pM current "
-                       "%pM\n", bssid, ifsta->bssid);
+                       "%pM\n", bss->cbss.bssid, ifsta->bssid);
 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
 
-        if (found && memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
+        if (bss &&
+            (!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) ||
+             memcmp(ifsta->bssid, bss->cbss.bssid, ETH_ALEN))) {
                 int ret;
-                int search_freq;
-
-                if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
-                        search_freq = bss->freq;
-                else
-                        search_freq = local->hw.conf.channel->center_freq;
-
-                bss = ieee80211_rx_bss_get(local, bssid, search_freq,
-                                           ifsta->ssid, ifsta->ssid_len);
-                if (!bss)
-                        goto dont_join;
 
                 printk(KERN_DEBUG "%s: Selected IBSS BSSID %pM"
                        " based on configured SSID\n",
-                       sdata->dev->name, bssid);
+                       sdata->dev->name, bss->cbss.bssid);
+
                 ret = ieee80211_sta_join_ibss(sdata, ifsta, bss);
                 ieee80211_rx_bss_put(local, bss);
                 return ret;
-        }
+        } else if (bss)
+                ieee80211_rx_bss_put(local, bss);
 
-dont_join:
 #ifdef CONFIG_MAC80211_IBSS_DEBUG
         printk(KERN_DEBUG "   did not try to join ibss\n");
 #endif /* CONFIG_MAC80211_IBSS_DEBUG */
@@ -2179,8 +2373,15 @@ dont_join:
                               IEEE80211_SCAN_INTERVAL)) {
                 printk(KERN_DEBUG "%s: Trigger new scan to find an IBSS to "
                        "join\n", sdata->dev->name);
-                return ieee80211_request_scan(sdata, ifsta->ssid,
-                                              ifsta->ssid_len);
+
+                /* XXX maybe racy? */
+                if (local->scan_req)
+                        return -EBUSY;
+
+                memcpy(local->int_scan_req.ssids[0].ssid,
+                       ifsta->ssid, IEEE80211_MAX_SSID_LEN);
+                local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
+                return ieee80211_request_scan(sdata, &local->int_scan_req);
         } else if (ifsta->state != IEEE80211_STA_MLME_IBSS_JOINED) {
                 int interval = IEEE80211_SCAN_INTERVAL;
 
@@ -2214,76 +2415,81 @@ static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
                                      struct ieee80211_if_sta *ifsta)
 {
         struct ieee80211_local *local = sdata->local;
-        struct ieee80211_bss *bss, *selected = NULL;
-        int top_rssi = 0, freq;
-
-        spin_lock_bh(&local->bss_lock);
-        freq = local->oper_channel->center_freq;
-        list_for_each_entry(bss, &local->bss_list, list) {
-                if (!(bss->capability & WLAN_CAPABILITY_ESS))
-                        continue;
-
-                if ((ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
-                        IEEE80211_STA_AUTO_BSSID_SEL |
-                        IEEE80211_STA_AUTO_CHANNEL_SEL)) &&
-                    (!!(bss->capability & WLAN_CAPABILITY_PRIVACY) ^
-                     !!sdata->default_key))
-                        continue;
-
-                if (!(ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL) &&
-                    bss->freq != freq)
-                        continue;
-
-                if (!(ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL) &&
-                    memcmp(bss->bssid, ifsta->bssid, ETH_ALEN))
-                        continue;
-
-                if (!(ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) &&
-                    !ieee80211_sta_match_ssid(ifsta, bss->ssid, bss->ssid_len))
-                        continue;
-
-                if (!selected || top_rssi < bss->signal) {
-                        selected = bss;
-                        top_rssi = bss->signal;
-                }
+        struct ieee80211_bss *bss;
+        u8 *bssid = ifsta->bssid, *ssid = ifsta->ssid;
+        u8 ssid_len = ifsta->ssid_len;
+        u16 capa_mask = WLAN_CAPABILITY_ESS;
+        u16 capa_val = WLAN_CAPABILITY_ESS;
+        struct ieee80211_channel *chan = local->oper_channel;
+
+        if (ifsta->flags & (IEEE80211_STA_AUTO_SSID_SEL |
+                            IEEE80211_STA_AUTO_BSSID_SEL |
+                            IEEE80211_STA_AUTO_CHANNEL_SEL)) {
+                capa_mask |= WLAN_CAPABILITY_PRIVACY;
+                if (sdata->default_key)
+                        capa_val |= WLAN_CAPABILITY_PRIVACY;
         }
-        if (selected)
-                atomic_inc(&selected->users);
-        spin_unlock_bh(&local->bss_lock);
 
-        if (selected) {
-                ieee80211_set_freq(sdata, selected->freq);
+        if (ifsta->flags & IEEE80211_STA_AUTO_CHANNEL_SEL)
+                chan = NULL;
+
+        if (ifsta->flags & IEEE80211_STA_AUTO_BSSID_SEL)
+                bssid = NULL;
+
+        if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL) {
+                ssid = NULL;
+                ssid_len = 0;
+        }
+
+        bss = (void *)cfg80211_get_bss(local->hw.wiphy, chan,
+                                       bssid, ssid, ssid_len,
+                                       capa_mask, capa_val);
+
+        if (bss) {
+                ieee80211_set_freq(sdata, bss->cbss.channel->center_freq);
                 if (!(ifsta->flags & IEEE80211_STA_SSID_SET))
-                        ieee80211_sta_set_ssid(sdata, selected->ssid,
-                                               selected->ssid_len);
-                ieee80211_sta_set_bssid(sdata, selected->bssid);
-                ieee80211_sta_def_wmm_params(sdata, selected);
+                        ieee80211_sta_set_ssid(sdata, bss->ssid,
+                                               bss->ssid_len);
+                ieee80211_sta_set_bssid(sdata, bss->cbss.bssid);
+                ieee80211_sta_def_wmm_params(sdata, bss->supp_rates_len,
+                                                    bss->supp_rates);
+                if (sdata->u.sta.mfp == IEEE80211_MFP_REQUIRED)
+                        sdata->u.sta.flags |= IEEE80211_STA_MFP_ENABLED;
+                else
+                        sdata->u.sta.flags &= ~IEEE80211_STA_MFP_ENABLED;
 
                 /* Send out direct probe if no probe resp was received or
                  * the one we have is outdated
                  */
-                if (!selected->last_probe_resp ||
-                    time_after(jiffies, selected->last_probe_resp
+                if (!bss->last_probe_resp ||
+                    time_after(jiffies, bss->last_probe_resp
                                         + IEEE80211_SCAN_RESULT_EXPIRE))
                         ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
                 else
                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
 
-                ieee80211_rx_bss_put(local, selected);
+                ieee80211_rx_bss_put(local, bss);
                 ieee80211_sta_reset_auth(sdata, ifsta);
                 return 0;
         } else {
                 if (ifsta->assoc_scan_tries < IEEE80211_ASSOC_SCANS_MAX_TRIES) {
                         ifsta->assoc_scan_tries++;
+                        /* XXX maybe racy? */
+                        if (local->scan_req)
+                                return -1;
+                        memcpy(local->int_scan_req.ssids[0].ssid,
+                               ifsta->ssid, IEEE80211_MAX_SSID_LEN);
                         if (ifsta->flags & IEEE80211_STA_AUTO_SSID_SEL)
-                                ieee80211_start_scan(sdata, NULL, 0);
+                                local->int_scan_req.ssids[0].ssid_len = 0;
                         else
-                                ieee80211_start_scan(sdata, ifsta->ssid,
-                                                         ifsta->ssid_len);
+                                local->int_scan_req.ssids[0].ssid_len = ifsta->ssid_len;
+                        ieee80211_start_scan(sdata, &local->int_scan_req);
                         ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
                         set_bit(IEEE80211_STA_REQ_AUTH, &ifsta->request);
-                } else
+                } else {
+                        ifsta->assoc_scan_tries = 0;
                         ifsta->state = IEEE80211_STA_MLME_DISABLED;
+                }
         }
         return -1;
 }
@@ -2315,8 +2521,7 @@ static void ieee80211_sta_work(struct work_struct *work)
             ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
             ifsta->state != IEEE80211_STA_MLME_ASSOCIATE &&
             test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
-                ieee80211_start_scan(sdata, ifsta->scan_ssid,
-                                     ifsta->scan_ssid_len);
+                ieee80211_start_scan(sdata, local->scan_req);
                 return;
         }
 
@@ -2376,8 +2581,11 @@ void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
 
         ifsta = &sdata->u.sta;
         INIT_WORK(&ifsta->work, ieee80211_sta_work);
+        INIT_WORK(&ifsta->chswitch_work, ieee80211_chswitch_work);
         setup_timer(&ifsta->timer, ieee80211_sta_timer,
                     (unsigned long) sdata);
+        setup_timer(&ifsta->chswitch_timer, ieee80211_chswitch_timer,
+                    (unsigned long) sdata);
         skb_queue_head_init(&ifsta->skb_queue);
 
         ifsta->capab = WLAN_CAPABILITY_ESS;
@@ -2396,7 +2604,7 @@ void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
  * must be callable in atomic context.
  */
 struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
-                                        u8 *bssid,u8 *addr, u64 supp_rates)
+                                        u8 *bssid,u8 *addr, u32 supp_rates)
 {
         struct ieee80211_local *local = sdata->local;
         struct sta_info *sta;
@@ -2474,16 +2682,16 @@ int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size
                 memset(ifsta->ssid, 0, sizeof(ifsta->ssid));
                 memcpy(ifsta->ssid, ssid, len);
                 ifsta->ssid_len = len;
-                ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
         }
 
+        ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
+
         if (len)
                 ifsta->flags |= IEEE80211_STA_SSID_SET;
         else
                 ifsta->flags &= ~IEEE80211_STA_SSID_SET;
 
-        if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
-            !(ifsta->flags & IEEE80211_STA_BSSID_SET)) {
+        if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
                 ifsta->ibss_join_req = jiffies;
                 ifsta->state = IEEE80211_STA_MLME_IBSS_SEARCH;
                 return ieee80211_sta_find_ibss(sdata, ifsta);
@@ -2503,31 +2711,25 @@ int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size
 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
 {
         struct ieee80211_if_sta *ifsta;
-        int res;
 
         ifsta = &sdata->u.sta;
 
-        if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
+        if (is_valid_ether_addr(bssid)) {
                 memcpy(ifsta->bssid, bssid, ETH_ALEN);
-                res = 0;
-                /*
-                 * Hack! See also ieee80211_sta_set_ssid.
-                 */
-                if (netif_running(sdata->dev))
-                        res = ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
-                if (res) {
+                ifsta->flags |= IEEE80211_STA_BSSID_SET;
+        } else {
+                memset(ifsta->bssid, 0, ETH_ALEN);
+                ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
+        }
+
+        if (netif_running(sdata->dev)) {
+                if (ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID)) {
                         printk(KERN_DEBUG "%s: Failed to config new BSSID to "
                                "the low-level driver\n", sdata->dev->name);
-                        return res;
                 }
         }
 
-        if (is_valid_ether_addr(bssid))
-                ifsta->flags |= IEEE80211_STA_BSSID_SET;
-        else
-                ifsta->flags &= ~IEEE80211_STA_BSSID_SET;
-
-        return 0;
+        return ieee80211_sta_set_ssid(sdata, ifsta->ssid, ifsta->ssid_len);
 }
 
 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)
@@ -2590,9 +2792,8 @@ void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
 
         if (sdata && sdata->vif.type == NL80211_IFTYPE_ADHOC) {
                 ifsta = &sdata->u.sta;
-                if (!(ifsta->flags & IEEE80211_STA_BSSID_SET) ||
-                    (!(ifsta->state == IEEE80211_STA_MLME_IBSS_JOINED) &&
-                    !ieee80211_sta_active_ibss(sdata)))
+                if ((!(ifsta->flags & IEEE80211_STA_PREV_BSSID_SET)) ||
+                    !ieee80211_sta_active_ibss(sdata))
                         ieee80211_sta_find_ibss(sdata, ifsta);
         }
 
@@ -2623,12 +2824,15 @@ void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
         struct ieee80211_local *local =
                 container_of(work, struct ieee80211_local,
                              dynamic_ps_enable_work);
+        struct ieee80211_sub_if_data *sdata = local->scan_sdata;
 
         if (local->hw.conf.flags & IEEE80211_CONF_PS)
                 return;
 
-        local->hw.conf.flags |= IEEE80211_CONF_PS;
+        if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
+                ieee80211_send_nullfunc(local, sdata, 1);
 
+        local->hw.conf.flags |= IEEE80211_CONF_PS;
         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 }