Improve module load (#470)

* Add additional check for needed kernel modules

* Check if wireguard and tun modules are loaded

If modules are loaded return true, otherwise attempt to load them

* fix state check

* Add module function tests

* Add test execution in container

* run client package tests on docker

* add package comment to new file

* force entrypoint

* add --privileged flag

* clean only if tables where created

* run from within the directories

client/internal/connect.go

@@ -107,7 +107,7 @@ func RunClient(ctx context.Context, config *Config, statusRecorder *nbStatus.Sta
 		localPeerState := nbStatus.LocalPeerState{
 			IP:              loginResp.GetPeerConfig().GetAddress(),
 			PubKey:          myPrivateKey.PublicKey().String(),
-			KernelInterface: iface.WireguardModExists(),
+			KernelInterface: iface.WireguardModuleIsLoaded(),
 		}
 
 		statusRecorder.UpdateLocalPeerState(localPeerState)

client/internal/routemanager/nftables_linux.go

@@ -84,8 +84,10 @@ func (n *nftablesManager) CleanRoutingRules() {
 	n.mux.Lock()
 	defer n.mux.Unlock()
 	log.Debug("flushing tables")
-	n.conn.FlushTable(n.tableIPv6)
-	n.conn.FlushTable(n.tableIPv4)
+	if n.tableIPv4 != nil && n.tableIPv6 != nil {
+		n.conn.FlushTable(n.tableIPv6)
+		n.conn.FlushTable(n.tableIPv4)
+	}
 	log.Debugf("flushing tables result in: %v error", n.conn.Flush())
 }