[openfortivpn] Control IPv6 data leak prevention with additional PPPD…

… noipv6. JB#53542

Add the PPPD supported option noipv6 to be used to control IPv6 data
leak prevention feature. The value must be explicitly set to true to
enable the feature.

OpenFortiVPN does not yet support the option but as it uses PPPD the
option it may be enabled in the future releases.

connman/vpn/plugins/openfortivpn.c

@@ -70,6 +70,7 @@ struct {
 								OPT_BOOL},
 	{ "openfortivpn.TrustedCert", "--trusted-cert", 1, 1, OPT_STRING},
 	{ "openfortivpn.Port", NULL, 1, 0, OPT_STRING},
+	{ "PPPD.NoIPv6", "--pppd-noipv6", 0, 1, OPT_BOOL },
 };
 
 #define ROUTE_NETWORK_KEY_PREFIX "route_network_"
@@ -278,6 +279,7 @@ static int task_append_config_data(struct vpn_provider *provider,
 					struct connman_task *task)
 {
 	const char *value = NULL;
+	bool no_ipv6 = false;
 	int i;
 
 	for (i = 0; i < (int)ARRAY_SIZE(ofv_options); i++) {
@@ -305,11 +307,17 @@ static int task_append_config_data(struct vpn_provider *provider,
 						ofv_options[i].cm_opt, false))
 				continue;
 
-			connman_task_add_argument(task, ofv_options[i].ofv_opt,
-						NULL);
+			if (!g_strcmp0(ofv_options[i].cm_opt, "PPPD.NoIPv6"))
+				no_ipv6 = true;
+			else
+				connman_task_add_argument(task,
+							ofv_options[i].ofv_opt,
+							NULL);
 		}
 	}
 
+	vpn_provider_set_supported_ip_networks(provider, true, !no_ipv6);
+
 	return 0;
 }