9 files changed, 249 insertions, 36 deletions

diff --git a/net/mac80211/Makefile b/net/mac80211/Makefile
index 04420291e7ad..84b48ba8a77e 100644
--- a/net/mac80211/Makefile
+++ b/net/mac80211/Makefile
@@ -23,7 +23,8 @@ mac80211-y := \
         key.o \
         util.o \
         wme.o \
-        event.o
+        event.o \
+        chan.o
 
 mac80211-$(CONFIG_MAC80211_LEDS) += led.o
 mac80211-$(CONFIG_MAC80211_DEBUGFS) += \
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index ae37270a0633..c7000a6ca379 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1162,15 +1162,39 @@ static int ieee80211_set_txq_params(struct wiphy *wiphy,
 }
 
 static int ieee80211_set_channel(struct wiphy *wiphy,
+                                 struct net_device *netdev,
                                  struct ieee80211_channel *chan,
                                  enum nl80211_channel_type channel_type)
 {
         struct ieee80211_local *local = wiphy_priv(wiphy);
+        struct ieee80211_sub_if_data *sdata = NULL;
+
+        if (netdev)
+                sdata = IEEE80211_DEV_TO_SUB_IF(netdev);
+
+        switch (ieee80211_get_channel_mode(local, NULL)) {
+        case CHAN_MODE_HOPPING:
+                return -EBUSY;
+        case CHAN_MODE_FIXED:
+                if (local->oper_channel != chan)
+                        return -EBUSY;
+                if (!sdata && local->_oper_channel_type == channel_type)
+                        return 0;
+                break;
+        case CHAN_MODE_UNDEFINED:
+                break;
+        }
 
         local->oper_channel = chan;
-        local->oper_channel_type = channel_type;
 
-        return ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
+        if (!ieee80211_set_channel_type(local, sdata, channel_type))
+                return -EBUSY;
+
+        ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
+        if (sdata && sdata->vif.type != NL80211_IFTYPE_MONITOR)
+                ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT);
+
+        return 0;
 }
 
 #ifdef CONFIG_PM
@@ -1214,6 +1238,20 @@ static int ieee80211_auth(struct wiphy *wiphy, struct net_device *dev,
 static int ieee80211_assoc(struct wiphy *wiphy, struct net_device *dev,
                            struct cfg80211_assoc_request *req)
 {
+        struct ieee80211_local *local = wiphy_priv(wiphy);
+        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+        switch (ieee80211_get_channel_mode(local, sdata)) {
+        case CHAN_MODE_HOPPING:
+                return -EBUSY;
+        case CHAN_MODE_FIXED:
+                if (local->oper_channel == req->bss->channel)
+                        break;
+                return -EBUSY;
+        case CHAN_MODE_UNDEFINED:
+                break;
+        }
+
         return ieee80211_mgd_assoc(IEEE80211_DEV_TO_SUB_IF(dev), req);
 }
 
@@ -1236,8 +1274,22 @@ static int ieee80211_disassoc(struct wiphy *wiphy, struct net_device *dev,
 static int ieee80211_join_ibss(struct wiphy *wiphy, struct net_device *dev,
                                struct cfg80211_ibss_params *params)
 {
+        struct ieee80211_local *local = wiphy_priv(wiphy);
         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 
+        switch (ieee80211_get_channel_mode(local, sdata)) {
+        case CHAN_MODE_HOPPING:
+                return -EBUSY;
+        case CHAN_MODE_FIXED:
+                if (!params->channel_fixed)
+                        return -EBUSY;
+                if (local->oper_channel == params->channel)
+                        break;
+                return -EBUSY;
+        case CHAN_MODE_UNDEFINED:
+                break;
+        }
+
         return ieee80211_ibss_join(sdata, params);
 }
 
@@ -1366,7 +1418,7 @@ int __ieee80211_request_smps(struct ieee80211_sub_if_data *sdata,
          * association, there's no need to send an action frame.
          */
         if (!sdata->u.mgd.associated ||
-            sdata->local->oper_channel_type == NL80211_CHAN_NO_HT) {
+            sdata->vif.bss_conf.channel_type == NL80211_CHAN_NO_HT) {
                 mutex_lock(&sdata->local->iflist_mtx);
                 ieee80211_recalc_smps(sdata->local, sdata);
                 mutex_unlock(&sdata->local->iflist_mtx);
diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
new file mode 100644
index 000000000000..5d218c530a4e
--- /dev/null
+++ b/net/mac80211/chan.c
@@ -0,0 +1,127 @@
+/*
+ * mac80211 - channel management
+ */
+
+#include <linux/nl80211.h>
+#include "ieee80211_i.h"
+
+enum ieee80211_chan_mode
+__ieee80211_get_channel_mode(struct ieee80211_local *local,
+                             struct ieee80211_sub_if_data *ignore)
+{
+        struct ieee80211_sub_if_data *sdata;
+
+        WARN_ON(!mutex_is_locked(&local->iflist_mtx));
+
+        list_for_each_entry(sdata, &local->interfaces, list) {
+                if (sdata == ignore)
+                        continue;
+
+                if (!ieee80211_sdata_running(sdata))
+                        continue;
+
+                if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
+                        continue;
+
+                if (sdata->vif.type == NL80211_IFTYPE_STATION &&
+                    !sdata->u.mgd.associated)
+                        continue;
+
+                if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
+                        if (!sdata->u.ibss.ssid_len)
+                                continue;
+                        if (!sdata->u.ibss.fixed_channel)
+                                return CHAN_MODE_HOPPING;
+                }
+
+                if (sdata->vif.type == NL80211_IFTYPE_AP &&
+                    !sdata->u.ap.beacon)
+                        continue;
+
+                return CHAN_MODE_FIXED;
+        }
+
+        return CHAN_MODE_UNDEFINED;
+}
+
+enum ieee80211_chan_mode
+ieee80211_get_channel_mode(struct ieee80211_local *local,
+                           struct ieee80211_sub_if_data *ignore)
+{
+        enum ieee80211_chan_mode mode;
+
+        mutex_lock(&local->iflist_mtx);
+        mode = __ieee80211_get_channel_mode(local, ignore);
+        mutex_unlock(&local->iflist_mtx);
+
+        return mode;
+}
+
+bool ieee80211_set_channel_type(struct ieee80211_local *local,
+                                struct ieee80211_sub_if_data *sdata,
+                                enum nl80211_channel_type chantype)
+{
+        struct ieee80211_sub_if_data *tmp;
+        enum nl80211_channel_type superchan = NL80211_CHAN_NO_HT;
+        bool result;
+
+        mutex_lock(&local->iflist_mtx);
+
+        list_for_each_entry(tmp, &local->interfaces, list) {
+                if (tmp == sdata)
+                        continue;
+
+                if (!ieee80211_sdata_running(tmp))
+                        continue;
+
+                switch (tmp->vif.bss_conf.channel_type) {
+                case NL80211_CHAN_NO_HT:
+                case NL80211_CHAN_HT20:
+                        superchan = tmp->vif.bss_conf.channel_type;
+                        break;
+                case NL80211_CHAN_HT40PLUS:
+                        WARN_ON(superchan == NL80211_CHAN_HT40MINUS);
+                        superchan = NL80211_CHAN_HT40PLUS;
+                        break;
+                case NL80211_CHAN_HT40MINUS:
+                        WARN_ON(superchan == NL80211_CHAN_HT40PLUS);
+                        superchan = NL80211_CHAN_HT40MINUS;
+                        break;
+                }
+        }
+
+        switch (superchan) {
+        case NL80211_CHAN_NO_HT:
+        case NL80211_CHAN_HT20:
+                /*
+                 * allow any change that doesn't go to no-HT
+                 * (if it already is no-HT no change is needed)
+                 */
+                if (chantype == NL80211_CHAN_NO_HT)
+                        break;
+                superchan = chantype;
+                break;
+        case NL80211_CHAN_HT40PLUS:
+        case NL80211_CHAN_HT40MINUS:
+                /* allow smaller bandwidth and same */
+                if (chantype == NL80211_CHAN_NO_HT)
+                        break;
+                if (chantype == NL80211_CHAN_HT20)
+                        break;
+                if (superchan == chantype)
+                        break;
+                result = false;
+                goto out;
+        }
+
+        local->_oper_channel_type = superchan;
+
+        if (sdata)
+                sdata->vif.bss_conf.channel_type = chantype;
+
+        result = true;
+ out:
+        mutex_unlock(&local->iflist_mtx);
+
+        return result;
+}
diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index b72ee6435fa3..b2cc1fda6cfd 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -103,7 +103,7 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
         sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
 
         local->oper_channel = chan;
-        local->oper_channel_type = NL80211_CHAN_NO_HT;
+        WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
 
         sband = local->hw.wiphy->bands[chan->band];
@@ -911,7 +911,8 @@ int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
         /* fix ourselves to that channel now already */
         if (params->channel_fixed) {
                 sdata->local->oper_channel = params->channel;
-                sdata->local->oper_channel_type = NL80211_CHAN_NO_HT;
+                WARN_ON(!ieee80211_set_channel_type(sdata->local, sdata,
+                                                    NL80211_CHAN_NO_HT));
         }
 
         if (params->ie) {
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index cbaf4981e110..7ef7798d04cd 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -767,7 +767,7 @@ struct ieee80211_local {
         enum mac80211_scan_state next_scan_state;
         struct delayed_work scan_work;
         struct ieee80211_sub_if_data *scan_sdata;
-        enum nl80211_channel_type oper_channel_type;
+        enum nl80211_channel_type _oper_channel_type;
         struct ieee80211_channel *oper_channel, *csa_channel;
 
         /* Temporary remain-on-channel for off-channel operations */
@@ -1228,6 +1228,20 @@ int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata,
 int ieee80211_wk_cancel_remain_on_channel(
         struct ieee80211_sub_if_data *sdata, u64 cookie);
 
+/* channel management */
+enum ieee80211_chan_mode {
+        CHAN_MODE_UNDEFINED,
+        CHAN_MODE_HOPPING,
+        CHAN_MODE_FIXED,
+};
+
+enum ieee80211_chan_mode
+ieee80211_get_channel_mode(struct ieee80211_local *local,
+                           struct ieee80211_sub_if_data *ignore);
+bool ieee80211_set_channel_type(struct ieee80211_local *local,
+                                struct ieee80211_sub_if_data *sdata,
+                                enum nl80211_channel_type chantype);
+
 #ifdef CONFIG_MAC80211_NOINLINE
 #define debug_noinline noinline
 #else
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index bd632e1ee2c5..22a384dfab65 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -111,7 +111,7 @@ int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
                 channel_type = local->tmp_channel_type;
         } else {
                 chan = local->oper_channel;
-                channel_type = local->oper_channel_type;
+                channel_type = local->_oper_channel_type;
         }
 
         if (chan != local->hw.conf.channel ||
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 358226f63b81..11783192a625 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -137,11 +137,14 @@ static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
         struct sta_info *sta;
         u32 changed = 0;
         u16 ht_opmode;
-        bool enable_ht = true, ht_changed;
+        bool enable_ht = true;
+        enum nl80211_channel_type prev_chantype;
         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 
         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 
+        prev_chantype = sdata->vif.bss_conf.channel_type;
+
         /* HT is not supported */
         if (!sband->ht_cap.ht_supported)
                 enable_ht = false;
@@ -172,38 +175,37 @@ static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
                 }
         }
 
-        ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
-                     channel_type != local->hw.conf.channel_type;
-
         if (local->tmp_channel)
                 local->tmp_channel_type = channel_type;
-        local->oper_channel_type = channel_type;
 
-        if (ht_changed) {
-                /* channel_type change automatically detected */
-                ieee80211_hw_config(local, 0);
+        if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
+                /* can only fail due to HT40+/- mismatch */
+                channel_type = NL80211_CHAN_HT20;
+                WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
+        }
 
+        /* channel_type change automatically detected */
+        ieee80211_hw_config(local, 0);
+
+        if (prev_chantype != channel_type) {
                 rcu_read_lock();
                 sta = sta_info_get(sdata, bssid);
                 if (sta)
                         rate_control_rate_update(local, sband, sta,
                                                  IEEE80211_RC_HT_CHANGED,
-                                                 local->oper_channel_type);
+                                                 channel_type);
                 rcu_read_unlock();
-        }
-
-        /* disable HT */
-        if (!enable_ht)
-                return 0;
+        }
 
         ht_opmode = le16_to_cpu(hti->operation_mode);
 
         /* if bss configuration changed store the new one */
-        if (!sdata->ht_opmode_valid ||
-            sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
+        if (sdata->ht_opmode_valid != enable_ht ||
+            sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
+            prev_chantype != channel_type) {
                 changed |= BSS_CHANGED_HT;
                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
-                sdata->ht_opmode_valid = true;
+                sdata->ht_opmode_valid = enable_ht;
         }
 
         return changed;
@@ -866,7 +868,7 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
         ieee80211_set_wmm_default(sdata);
 
         /* channel(_type) changes are handled by ieee80211_hw_config */
-        local->oper_channel_type = NL80211_CHAN_NO_HT;
+        WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
 
         /* on the next assoc, re-program HT parameters */
         sdata->ht_opmode_valid = false;
@@ -883,8 +885,8 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 
         ieee80211_hw_config(local, config_changed);
 
-        /* And the BSSID changed -- not very interesting here */
-        changed |= BSS_CHANGED_BSSID;
+        /* The BSSID (not really interesting) and HT changed */
+        changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
         ieee80211_bss_info_change_notify(sdata, changed);
 
         if (remove_sta)
@@ -2266,7 +2268,7 @@ int ieee80211_mgd_action(struct ieee80211_sub_if_data *sdata,
         if ((chan != local->tmp_channel ||
              channel_type != local->tmp_channel_type) &&
             (chan != local->oper_channel ||
-             channel_type != local->oper_channel_type))
+             channel_type != local->_oper_channel_type))
                 return -EBUSY;
 
         skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index f3841f43249e..680bcb7093db 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -2251,8 +2251,9 @@ struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
 
         info->control.vif = vif;
 
-        info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
-        info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
+        info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
+                        IEEE80211_TX_CTL_ASSIGN_SEQ |
+                        IEEE80211_TX_CTL_FIRST_FRAGMENT;
  out:
         rcu_read_unlock();
         return skb;
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 2b75b4fb68f4..5b79d552780a 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -1160,18 +1160,33 @@ int ieee80211_reconfig(struct ieee80211_local *local)
 
         /* Finally also reconfigure all the BSS information */
         list_for_each_entry(sdata, &local->interfaces, list) {
-                u32 changed = ~0;
+                u32 changed;
+
                 if (!ieee80211_sdata_running(sdata))
                         continue;
+
+                /* common change flags for all interface types */
+                changed = BSS_CHANGED_ERP_CTS_PROT |
+                          BSS_CHANGED_ERP_PREAMBLE |
+                          BSS_CHANGED_ERP_SLOT |
+                          BSS_CHANGED_HT |
+                          BSS_CHANGED_BASIC_RATES |
+                          BSS_CHANGED_BEACON_INT |
+                          BSS_CHANGED_BSSID |
+                          BSS_CHANGED_CQM;
+
                 switch (sdata->vif.type) {
                 case NL80211_IFTYPE_STATION:
-                        /* disable beacon change bits */
-                        changed &= ~(BSS_CHANGED_BEACON |
-                                     BSS_CHANGED_BEACON_ENABLED);
-                        /* fall through */
+                        changed |= BSS_CHANGED_ASSOC;
+                        ieee80211_bss_info_change_notify(sdata, changed);
+                        break;
                 case NL80211_IFTYPE_ADHOC:
+                        changed |= BSS_CHANGED_IBSS;
+                        /* fall through */
                 case NL80211_IFTYPE_AP:
                 case NL80211_IFTYPE_MESH_POINT:
+                        changed |= BSS_CHANGED_BEACON |
+                                   BSS_CHANGED_BEACON_ENABLED;
                         ieee80211_bss_info_change_notify(sdata, changed);
                         break;
                 case NL80211_IFTYPE_WDS: