mac80211: pass P2P powersave parameters to driver

While connected to a GO, parse the P2P NoA attribute
and pass the CT Window and opportunistic powersave
parameters to the driver.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/mlme.c

@@ -1365,6 +1365,22 @@ static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 
 	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
 
+	if (sdata->vif.p2p) {
+		u8 noa[2];
+		int ret;
+
+		ret = cfg80211_get_p2p_attr(cbss->information_elements,
+					    cbss->len_information_elements,
+					    IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
+					    noa, sizeof(noa));
+		if (ret >= 2) {
+			bss_conf->p2p_oppps = noa[1] & 0x80;
+			bss_conf->p2p_ctwindow = noa[1] & 0x7f;
+			bss_info_changed |= BSS_CHANGED_P2P_PS;
+			sdata->u.mgd.p2p_noa_index = noa[0];
+		}
+	}
+
 	/* just to be sure */
 	ieee80211_stop_poll(sdata);
 
@@ -1487,6 +1503,9 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 	changed |= BSS_CHANGED_ASSOC;
 	sdata->vif.bss_conf.assoc = false;
 
+	sdata->vif.bss_conf.p2p_ctwindow = 0;
+	sdata->vif.bss_conf.p2p_oppps = false;
+
 	/* on the next assoc, re-program HT parameters */
 	memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
 	memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
@@ -2594,6 +2613,27 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
 		}
 	}
 
+	if (sdata->vif.p2p) {
+		u8 noa[2];
+		int ret;
+
+		ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
+					    len - baselen,
+					    IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
+					    noa, sizeof(noa));
+		if (ret >= 2 && sdata->u.mgd.p2p_noa_index != noa[0]) {
+			bss_conf->p2p_oppps = noa[1] & 0x80;
+			bss_conf->p2p_ctwindow = noa[1] & 0x7f;
+			changed |= BSS_CHANGED_P2P_PS;
+			sdata->u.mgd.p2p_noa_index = noa[0];
+			/*
+			 * make sure we update all information, the CRC
+			 * mechanism doesn't look at P2P attributes.
+			 */
+			ifmgd->beacon_crc_valid = false;
+		}
+	}
+
 	if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
 		return;
 	ifmgd->beacon_crc = ncrc;