hostapd: Check usability of EDMG channel

Signed-off-by: Alexei Avshalom Lazar <ailizaro@codeaurora.org>

diff --git a/src/ap/hw_features.c b/src/ap/hw_features.c
index c1f19e26b55034164a555e2791f5197414dc24b0..a0720bad21d000ae607500aa2b2bdce0dc4085ef 100644 (file)
--- a/src/ap/hw_features.c
+++ b/src/ap/hw_features.c
@@ -730,6 +730,67 @@ static int hostapd_is_usable_chan(struct hostapd_iface *iface,
 }
 
 
+static int hostapd_is_usable_edmg(struct hostapd_iface *iface)
+{
+       int i, contiguous = 0;
+       int num_of_enabled = 0;
+       int max_contiguous = 0;
+       struct ieee80211_edmg_config edmg;
+
+       if (!iface->conf->enable_edmg)
+               return 1;
+
+       hostapd_encode_edmg_chan(iface->conf->enable_edmg,
+                                iface->conf->edmg_channel,
+                                iface->conf->channel,
+                                &edmg);
+       if (!(edmg.channels & BIT(iface->conf->channel - 1)))
+               return 0;
+
+       /* 60 GHz channels 1..6 */
+       for (i = 0; i < 6; i++) {
+               if (edmg.channels & BIT(i)) {
+                       contiguous++;
+                       num_of_enabled++;
+               } else {
+                       contiguous = 0;
+                       continue;
+               }
+
+               /* P802.11ay defines that the total number of subfields
+                * set to one does not exceed 4.
+                */
+               if (num_of_enabled > 4)
+                       return 0;
+
+               if (!hostapd_is_usable_chan(iface, i + 1, 1))
+                       return 0;
+
+               if (contiguous > max_contiguous)
+                       max_contiguous = contiguous;
+       }
+
+       /* Check if the EDMG configuration is valid under the limitations
+        * of P802.11ay.
+        */
+       /* check bw_config against contiguous EDMG channels */
+       switch (edmg.bw_config) {
+       case EDMG_BW_CONFIG_4:
+               if (!max_contiguous)
+                       return 0;
+               break;
+       case EDMG_BW_CONFIG_5:
+               if (max_contiguous < 2)
+                       return 0;
+               break;
+       default:
+               return 0;
+       }
+
+       return 1;
+}
+
+
 static int hostapd_is_usable_chans(struct hostapd_iface *iface)
 {
        int secondary_chan;
@@ -743,6 +804,9 @@ static int hostapd_is_usable_chans(struct hostapd_iface *iface)
        if (!hostapd_is_usable_chan(iface, iface->conf->channel, 1))
                return 0;
 
+       if (!hostapd_is_usable_edmg(iface))
+               return 0;
+
        if (!iface->conf->secondary_channel)
                return 1;