qcacld-3.0: Handle 0 count White list SSID/ black list BSSID

qcacld2.0 to qcacld-3.0 propagation

1) Roam enhancement change needs to handle the case of White list
   SSID value count can be zero. This zero count is reset mechanism
   to clean up the existing configuration.
2) The Blacklist BSSID count can also be zero and used as reset of
   existing list.

Change-Id: I9c753b571138ab7533e6e897b820ca1db72c3880
CRs-fixed: 2007708

core/hdd/src/wlan_hdd_cfg80211.c

@@ -2768,6 +2768,12 @@ wlan_hdd_cfg80211_get_features(struct wiphy *wiphy,
 	return ret;
 }
 
+#define PARAM_NUM_NW \
+	QCA_WLAN_VENDOR_ATTR_ROAMING_PARAM_WHITE_LIST_SSID_NUM_NETWORKS
+#define PARAM_SET_BSSID \
+	QCA_WLAN_VENDOR_ATTR_ROAMING_PARAM_SET_BSSID_PARAMS_BSSID
+#define PRAM_SSID_LIST QCA_WLAN_VENDOR_ATTR_ROAMING_PARAM_WHITE_LIST_SSID_LIST
+#define PARAM_LIST_SSID  QCA_WLAN_VENDOR_ATTR_ROAMING_PARAM_WHITE_LIST_SSID
 
 /**
  * __wlan_hdd_cfg80211_set_ext_roam_params() - Settings for roaming parameters
@@ -2791,7 +2797,7 @@ __wlan_hdd_cfg80211_set_ext_roam_params(struct wiphy *wiphy,
 	uint8_t session_id;
 	struct roam_ext_params roam_params;
 	uint32_t cmd_type, req_id;
-	struct nlattr *curr_attr;
+	struct nlattr *curr_attr = NULL;
 	struct nlattr *tb[QCA_WLAN_VENDOR_ATTR_ROAMING_PARAM_MAX + 1];
 	struct nlattr *tb2[QCA_WLAN_VENDOR_ATTR_ROAMING_PARAM_MAX + 1];
 	int rem, i;
@@ -2835,45 +2841,63 @@ __wlan_hdd_cfg80211_set_ext_roam_params(struct wiphy *wiphy,
 	switch (cmd_type) {
 	case QCA_WLAN_VENDOR_ATTR_ROAM_SUBCMD_SSID_WHITE_LIST:
 		i = 0;
-		nla_for_each_nested(curr_attr,
-			tb[QCA_WLAN_VENDOR_ATTR_ROAMING_PARAM_WHITE_LIST_SSID_LIST],
-			rem) {
-			if (nla_parse(tb2,
-				QCA_WLAN_VENDOR_ATTR_ROAM_SUBCMD_MAX,
-				nla_data(curr_attr), nla_len(curr_attr),
-				NULL)) {
-				hdd_err("nla_parse failed");
-				goto fail;
-			}
-			/* Parse and Fetch allowed SSID list*/
-			if (!tb2[QCA_WLAN_VENDOR_ATTR_ROAMING_PARAM_WHITE_LIST_SSID]) {
-				hdd_err("attr allowed ssid failed");
-				goto fail;
-			}
-			buf_len = nla_len(tb2[QCA_WLAN_VENDOR_ATTR_ROAMING_PARAM_WHITE_LIST_SSID]);
-			/*
-			 * Upper Layers include a null termination character.
-			 * Check for the actual permissible length of SSID and
-			 * also ensure not to copy the NULL termination
-			 * character to the driver buffer.
-			 */
-			if (buf_len && (i < MAX_SSID_ALLOWED_LIST) &&
-				((buf_len - 1) <= SIR_MAC_MAX_SSID_LENGTH)) {
-				nla_memcpy(
+		if (tb[PARAM_NUM_NW]) {
+			count = nla_get_u32(
+			tb[PARAM_NUM_NW]);
+		} else {
+			hdd_err("Number of networks is not provided");
+			goto fail;
+		}
+
+		if (count &&
+		tb[PRAM_SSID_LIST]) {
+			nla_for_each_nested(curr_attr,
+			tb[PRAM_SSID_LIST], rem) {
+				if (nla_parse(tb2,
+					QCA_WLAN_VENDOR_ATTR_ROAM_SUBCMD_MAX,
+					nla_data(curr_attr), nla_len(curr_attr),
+					NULL)) {
+					hdd_err("nla_parse failed");
+					goto fail;
+				}
+				/* Parse and Fetch allowed SSID list*/
+				if (!tb2[PARAM_LIST_SSID]) {
+					hdd_err("attr allowed ssid failed");
+					goto fail;
+				}
+				buf_len = nla_len(tb2[PARAM_LIST_SSID]);
+				/*
+				 * Upper Layers include a null termination
+				 * character. Check for the actual permissible
+				 * length of SSID and also ensure not to copy
+				 * the NULL termination character to the driver
+				 * buffer.
+				 */
+				if (buf_len && (i < MAX_SSID_ALLOWED_LIST) &&
+				    ((buf_len - 1) <=
+				    SIR_MAC_MAX_SSID_LENGTH)) {
+					nla_memcpy(
 					roam_params.ssid_allowed_list[i].ssId,
-					tb2[QCA_WLAN_VENDOR_ATTR_ROAMING_PARAM_WHITE_LIST_SSID],
-					buf_len - 1);
-				roam_params.ssid_allowed_list[i].length =
-					buf_len - 1;
-				hdd_debug("SSID[%d]: %.*s,length = %d", i,
+					tb2[PARAM_LIST_SSID], buf_len - 1);
+					roam_params.ssid_allowed_list[i].length
+					 = buf_len - 1;
+					hdd_debug("SSID[%d]: %.*s,length = %d",
+					i,
 					roam_params.ssid_allowed_list[i].length,
 					roam_params.ssid_allowed_list[i].ssId,
 					roam_params.ssid_allowed_list[i].length);
-				i++;
-			} else {
-				hdd_err("Invalid buffer length");
+					i++;
+				} else {
+					hdd_err("Invalid buffer length");
+				}
 			}
 		}
+		if (i != count) {
+			hdd_err("Invalid number of SSIDs i = %d, count = %d",
+						i, count);
+			goto fail;
+		}
+
 		roam_params.num_ssid_allowed_list = i;
 		hdd_debug("Num of Allowed SSID %d",
 			roam_params.num_ssid_allowed_list);
@@ -3035,34 +3059,38 @@ __wlan_hdd_cfg80211_set_ext_roam_params(struct wiphy *wiphy,
 		}
 		hdd_debug("Num of blacklist BSSID (%d)", count);
 		i = 0;
-		nla_for_each_nested(curr_attr,
+
+		if (count &&
+		    tb[QCA_WLAN_VENDOR_ATTR_ROAMING_PARAM_SET_BSSID_PARAMS]) {
+			nla_for_each_nested(curr_attr,
 			tb[QCA_WLAN_VENDOR_ATTR_ROAMING_PARAM_SET_BSSID_PARAMS],
 			rem) {
 
-			if (i == count) {
-				hdd_warn("Ignoring excess Blacklist BSSID");
-				break;
-			}
+				if (i == count) {
+					hdd_warn("Ignoring excess Blacklist BSSID");
+					break;
+				}
 
-			if (nla_parse(tb2,
-				QCA_WLAN_VENDOR_ATTR_ROAMING_PARAM_MAX,
-				nla_data(curr_attr), nla_len(curr_attr),
-				NULL)) {
-				hdd_err("nla_parse failed");
-				goto fail;
-			}
-			/* Parse and fetch MAC address */
-			if (!tb2[QCA_WLAN_VENDOR_ATTR_ROAMING_PARAM_SET_BSSID_PARAMS_BSSID]) {
-				hdd_err("attr blacklist addr failed");
-				goto fail;
+				if (nla_parse(tb2,
+				   QCA_WLAN_VENDOR_ATTR_ROAMING_PARAM_MAX,
+				   nla_data(curr_attr), nla_len(curr_attr),
+				   NULL)) {
+					hdd_err("nla_parse failed");
+					goto fail;
+				}
+				/* Parse and fetch MAC address */
+				if (!tb2[PARAM_SET_BSSID]) {
+					hdd_err("attr blacklist addr failed");
+					goto fail;
+				}
+				nla_memcpy(
+				   roam_params.bssid_avoid_list[i].bytes,
+				   tb2[PARAM_SET_BSSID], QDF_MAC_ADDR_SIZE);
+				hdd_debug(MAC_ADDRESS_STR,
+					MAC_ADDR_ARRAY(
+					roam_params.bssid_avoid_list[i].bytes));
+				i++;
 			}
-			nla_memcpy(roam_params.bssid_avoid_list[i].bytes,
-				tb2[QCA_WLAN_VENDOR_ATTR_ROAMING_PARAM_SET_BSSID_PARAMS_BSSID],
-				QDF_MAC_ADDR_SIZE);
-			hdd_debug(MAC_ADDRESS_STR,
-				MAC_ADDR_ARRAY(
-				roam_params.bssid_avoid_list[i].bytes));
-			i++;
 		}
 		if (i < count)
 			hdd_warn("Num Blacklist BSSID %u less than expected %u",
@@ -3076,6 +3104,11 @@ __wlan_hdd_cfg80211_set_ext_roam_params(struct wiphy *wiphy,
 fail:
 	return -EINVAL;
 }
+#undef PARAM_NUM_NW
+#undef PARAM_SET_BSSID
+#undef PRAM_SSID_LIST
+#undef PARAM_LIST_SSID
+
 
 /**
  * wlan_hdd_cfg80211_set_ext_roam_params() - set ext scan roam params