mac80211: allow scanning for 5/10 MHz channels in IBSS

Use a chandef instead of just the channel for scanning, and enable
5/10 Mhz scanning for IBSS mode. Also reporting is changed to the new
inform_bss functions.

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>

4 files changed, 56 insertions, 23 deletions

diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index 299603e4939f..8fa1c27bdfe3 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -51,6 +51,7 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
         u32 bss_change, rate_flags, rates = 0, rates_added = 0;
         u8 supp_rates[IEEE80211_MAX_SUPP_RATES];
         struct cfg80211_chan_def chandef;
+        enum nl80211_bss_scan_width scan_width;
         struct beacon_data *presp;
         int frame_len;
         int shift;
@@ -271,8 +272,10 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
         mod_timer(&ifibss->timer,
                   round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL));
 
-        bss = cfg80211_inform_bss_frame(local->hw.wiphy, chan,
-                                        mgmt, presp->head_len, 0, GFP_KERNEL);
+        scan_width = cfg80211_chandef_to_scan_width(&chandef);
+        bss = cfg80211_inform_bss_width_frame(local->hw.wiphy, chan,
+                                              scan_width, mgmt,
+                                              presp->head_len, 0, GFP_KERNEL);
         cfg80211_put_bss(local->hw.wiphy, bss);
         netif_carrier_on(sdata->dev);
         cfg80211_ibss_joined(sdata->dev, ifibss->bssid, GFP_KERNEL);
@@ -726,6 +729,7 @@ static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
 {
         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+        enum nl80211_bss_scan_width scan_width;
 
         sdata_assert_lock(sdata);
 
@@ -747,8 +751,9 @@ static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata)
         sdata_info(sdata,
                    "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n");
 
+        scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
         ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len,
-                                    NULL);
+                                    NULL, scan_width);
 }
 
 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
@@ -798,6 +803,7 @@ static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
         struct cfg80211_bss *cbss;
         struct ieee80211_channel *chan = NULL;
         const u8 *bssid = NULL;
+        enum nl80211_bss_scan_width scan_width;
         int active_ibss;
         u16 capability;
 
@@ -846,8 +852,10 @@ static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
                                         IEEE80211_SCAN_INTERVAL)) {
                 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n");
 
+                scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef);
                 ieee80211_request_ibss_scan(sdata, ifibss->ssid,
-                                            ifibss->ssid_len, chan);
+                                            ifibss->ssid_len, chan,
+                                            scan_width);
         } else {
                 int interval = IEEE80211_SCAN_INTERVAL;
 
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 6596da66bfaf..23a191b03bbf 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1057,7 +1057,7 @@ struct ieee80211_local {
         struct cfg80211_ssid scan_ssid;
         struct cfg80211_scan_request *int_scan_req;
         struct cfg80211_scan_request *scan_req, *hw_scan_req;
-        struct ieee80211_channel *scan_channel;
+        struct cfg80211_chan_def scan_chandef;
         enum ieee80211_band hw_scan_band;
         int scan_channel_idx;
         int scan_ies_len;
@@ -1337,7 +1337,8 @@ void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
 void ieee80211_scan_work(struct work_struct *work);
 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
                                 const u8 *ssid, u8 ssid_len,
-                                struct ieee80211_channel *chan);
+                                struct ieee80211_channel *chan,
+                                enum nl80211_bss_scan_width scan_width);
 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
                            struct cfg80211_scan_request *req);
 void ieee80211_scan_cancel(struct ieee80211_local *local);
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 6da98c77496b..25eb35b01938 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -102,17 +102,8 @@ static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
 
         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 
-        if (local->scan_channel) {
-                chandef.chan = local->scan_channel;
-                /* If scanning on oper channel, use whatever channel-type
-                 * is currently in use.
-                 */
-                if (chandef.chan == local->_oper_chandef.chan) {
-                        chandef = local->_oper_chandef;
-                } else {
-                        chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
-                        chandef.center_freq1 = chandef.chan->center_freq;
-                }
+        if (local->scan_chandef.chan) {
+                chandef = local->scan_chandef;
         } else if (local->tmp_channel) {
                 chandef.chan = local->tmp_channel;
                 chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 819d0956eb3b..08afe74b98f4 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -66,6 +66,7 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
         struct cfg80211_bss *cbss;
         struct ieee80211_bss *bss;
         int clen, srlen;
+        enum nl80211_bss_scan_width scan_width;
         s32 signal = 0;
 
         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
@@ -73,8 +74,15 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
                 signal = (rx_status->signal * 100) / local->hw.max_signal;
 
-        cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel,
-                                         mgmt, len, signal, GFP_ATOMIC);
+        scan_width = NL80211_BSS_CHAN_WIDTH_20;
+        if (rx_status->flag & RX_FLAG_5MHZ)
+                scan_width = NL80211_BSS_CHAN_WIDTH_5;
+        if (rx_status->flag & RX_FLAG_10MHZ)
+                scan_width = NL80211_BSS_CHAN_WIDTH_10;
+
+        cbss = cfg80211_inform_bss_width_frame(local->hw.wiphy, channel,
+                                               scan_width, mgmt, len, signal,
+                                               GFP_ATOMIC);
         if (!cbss)
                 return NULL;
 
@@ -300,7 +308,7 @@ static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted,
         rcu_assign_pointer(local->scan_sdata, NULL);
 
         local->scanning = 0;
-        local->scan_channel = NULL;
+        local->scan_chandef.chan = NULL;
 
         /* Set power back to normal operating levels. */
         ieee80211_hw_config(local, 0);
@@ -635,11 +643,34 @@ static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
 {
         int skip;
         struct ieee80211_channel *chan;
+        enum nl80211_bss_scan_width oper_scan_width;
 
         skip = 0;
         chan = local->scan_req->channels[local->scan_channel_idx];
 
-        local->scan_channel = chan;
+        local->scan_chandef.chan = chan;
+        local->scan_chandef.center_freq1 = chan->center_freq;
+        local->scan_chandef.center_freq2 = 0;
+        switch (local->scan_req->scan_width) {
+        case NL80211_BSS_CHAN_WIDTH_5:
+                local->scan_chandef.width = NL80211_CHAN_WIDTH_5;
+                break;
+        case NL80211_BSS_CHAN_WIDTH_10:
+                local->scan_chandef.width = NL80211_CHAN_WIDTH_10;
+                break;
+        case NL80211_BSS_CHAN_WIDTH_20:
+                /* If scanning on oper channel, use whatever channel-type
+                 * is currently in use.
+                 */
+                oper_scan_width = cfg80211_chandef_to_scan_width(
+                                        &local->_oper_chandef);
+                if (chan == local->_oper_chandef.chan &&
+                    oper_scan_width == local->scan_req->scan_width)
+                        local->scan_chandef = local->_oper_chandef;
+                else
+                        local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
+                break;
+        }
 
         if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
                 skip = 1;
@@ -679,7 +710,7 @@ static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
                                          unsigned long *next_delay)
 {
         /* switch back to the operating channel */
-        local->scan_channel = NULL;
+        local->scan_chandef.chan = NULL;
         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
 
         /* disable PS */
@@ -821,7 +852,8 @@ int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
 
 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
                                 const u8 *ssid, u8 ssid_len,
-                                struct ieee80211_channel *chan)
+                                struct ieee80211_channel *chan,
+                                enum nl80211_bss_scan_width scan_width)
 {
         struct ieee80211_local *local = sdata->local;
         int ret = -EBUSY;
@@ -871,6 +903,7 @@ int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
 
         local->int_scan_req->ssids = &local->scan_ssid;
         local->int_scan_req->n_ssids = 1;
+        local->int_scan_req->scan_width = scan_width;
         memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
         local->int_scan_req->ssids[0].ssid_len = ssid_len;