mac80211: add BSS coex IE to TDLS setup frames

Add the BSS coex IE in case we support HT40 channels, as mandated by
section 8.5.13 in IEEE802.11 2012.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 4e2bb91..adac1be 100644 (file)
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -2037,6 +2037,9 @@ enum ieee80211_tdls_actioncode {
 /* TDLS specific payload type in the LLC/SNAP header */
 #define WLAN_TDLS_SNAP_RFTYPE  0x2
 
+/* BSS Coex IE information field bits */
+#define WLAN_BSS_COEX_INFORMATION_REQUEST      BIT(0)
+
 /**
  * enum - mesh synchronization method identifier
  *

diff --git a/net/mac80211/tdls.c b/net/mac80211/tdls.c
index 8fb314b..30a4c10 100644 (file)
--- a/net/mac80211/tdls.c
+++ b/net/mac80211/tdls.c
@@ -117,6 +117,16 @@ ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
        *pos = 2 * subband_cnt;
 }
 
+static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb)
+{
+       u8 *pos = (void *)skb_put(skb, 3);
+
+       *pos++ = WLAN_EID_BSS_COEX_2040;
+       *pos++ = 1; /* len */
+
+       *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST;
+}
+
 static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
                                        u16 status_code)
 {
@@ -341,6 +351,10 @@ ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
 
        rcu_read_unlock();
 
+       if (ht_cap.ht_supported &&
+           (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
+               ieee80211_tdls_add_bss_coex_ie(skb);
+
        /* add any remaining IEs */
        if (extra_ies_len) {
                noffset = extra_ies_len;
@@ -597,6 +611,7 @@ ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
                               2 + max(sizeof(struct ieee80211_ht_cap),
                                       sizeof(struct ieee80211_ht_operation)) +
                               50 + /* supported channels */
+                              3 + /* 40/20 BSS coex */
                               extra_ies_len +
                               sizeof(struct ieee80211_tdls_lnkie));
        if (!skb)