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How to use _linux_cleanup_nat method in lisa

Best Python code snippet using lisa_python

nestedperf.py

...336                client_nic_name=self._NIC_NAME,337                test_case_name=inspect.stack()[1][3],338            )339        finally:340            self._linux_cleanup_nat(server_l1, self._BR_NAME, log)341            self._linux_cleanup_nat(client_l1, self._BR_NAME, log)342    @TestCaseMetadata(343        description="""344        This script runs ntttcp test on two nested VMs on different L1 guests345        connected with NAT346        """,347        priority=3,348        timeout=_TIME_OUT,349        requirement=simple_requirement(350            min_count=2,351            supported_os=[Windows],352            supported_platform_type=[AZURE, READY],353        ),354    )355    def perf_nested_hyperv_ntttcp_different_l1_nat(356        self,357        result: TestResult,358        variables: Dict[str, Any],359        log: Logger,360    ) -> None:361        environment = result.environment362        assert environment, "fail to get environment from testresult"363        server_l1 = cast(RemoteNode, environment.nodes[0])364        client_l1 = cast(RemoteNode, environment.nodes[1])365        # parse nested image variables366        (367            nested_image_username,368            nested_image_password,369            _,370            nested_image_url,371        ) = parse_nested_image_variables(variables)372        try:373            # setup nested vm on server in NAT configuration374            server_l2 = self._windows_setup_nat(375                node=server_l1,376                nested_vm_name="server_l2",377                guest_username=nested_image_username,378                guest_password=nested_image_password,379                guest_port=self._SERVER_HOST_FWD_PORT,380                guest_image_url=nested_image_url,381            )382            # setup nested vm on client in NAT configuration383            client_l2 = self._windows_setup_nat(384                node=client_l1,385                nested_vm_name="client_l2",386                guest_username=nested_image_username,387                guest_password=nested_image_password,388                guest_port=self._CLIENT_HOST_FWD_PORT,389                guest_image_url=nested_image_url,390            )391            # run ntttcp test392            perf_ntttcp(393                result,394                server_l2,395                client_l2,396                test_case_name=inspect.stack()[1][3],397            )398        finally:399            # cleanup server400            try:401                hyperv_remove_nested_vm(server_l1, "server_l2")402            except Exception as e:403                log.debug(f"Failed to clean up server vm: {e}")404                server_l1.mark_dirty()405            # cleanup client406            try:407                hyperv_remove_nested_vm(client_l1, "client_l2")408            except Exception as e:409                log.debug(f"Failed to clean up client vm: {e}")410                client_l1.mark_dirty()411    @TestCaseMetadata(412        description="""413        This script runs netperf test on two nested VMs on different L1 guests414        connected with NAT415        """,416        priority=3,417        timeout=_TIME_OUT,418        requirement=simple_requirement(419            min_count=2,420            network_interface=schema.NetworkInterfaceOptionSettings(421                nic_count=search_space.IntRange(min=2),422            ),423            disk=schema.DiskOptionSettings(424                data_disk_count=search_space.IntRange(min=1),425                data_disk_size=search_space.IntRange(min=12),426            ),427        ),428    )429    def perf_nested_kvm_netperf_pps_nat(430        self,431        result: TestResult,432        variables: Dict[str, Any],433        log: Logger,434    ) -> None:435        environment = result.environment436        assert environment, "fail to get environment from testresult"437        server_l1 = cast(RemoteNode, environment.nodes[0])438        client_l1 = cast(RemoteNode, environment.nodes[1])439        # parse nested image variables440        (441            nested_image_username,442            nested_image_password,443            _,444            nested_image_url,445        ) = parse_nested_image_variables(variables)446        try:447            # setup nested vm on server in NAT configuration448            server_l2 = self._linux_setup_nat(449                node=server_l1,450                nested_vm_name="server_l2",451                guest_username=nested_image_username,452                guest_password=nested_image_password,453                guest_port=self._SERVER_HOST_FWD_PORT,454                guest_image_url=nested_image_url,455                guest_internal_ip=self._SERVER_IP_ADDR,456                guest_default_nic=self._NIC_NAME,457                bridge_name=self._BR_NAME,458                bridge_network=self._BR_NETWORK,459                bridge_cidr=self._BR_CIDR,460                bridge_gateway=self._BR_GATEWAY,461            )462            # setup nested vm on client in NAT configuration463            client_l2 = self._linux_setup_nat(464                node=client_l1,465                nested_vm_name="client_l2",466                guest_username=nested_image_username,467                guest_password=nested_image_password,468                guest_port=self._CLIENT_HOST_FWD_PORT,469                guest_image_url=nested_image_url,470                guest_internal_ip=self._CLIENT_IP_ADDR,471                guest_default_nic=self._NIC_NAME,472                bridge_name=self._BR_NAME,473                bridge_network=self._BR_NETWORK,474                bridge_cidr=self._BR_CIDR,475                bridge_gateway=self._BR_GATEWAY,476            )477            # run netperf test478            perf_tcp_pps(result, "singlepps", server_l2, client_l2)479        finally:480            self._linux_cleanup_nat(server_l1, self._BR_NAME, log)481            self._linux_cleanup_nat(client_l1, self._BR_NAME, log)482    def _linux_setup_nat(483        self,484        node: RemoteNode,485        nested_vm_name: str,486        guest_username: str,487        guest_password: str,488        guest_port: int,489        guest_image_url: str,490        guest_internal_ip: str,491        guest_default_nic: str,492        bridge_name: str,493        bridge_network: str,494        bridge_cidr: str,495        bridge_gateway: str,496    ) -> RemoteNode:497        """498        Setup NAT on the node with following configurations:499        1. Forward traffic on node's eth0 interface and port `guest_port`500        to the nested VM's port 22.501        2. Forward all traffic on node's eth1 interface to the nested VM.502        """503        # get core count504        core_count = node.tools[Lscpu].get_core_count()505        node_eth1_ip = node.nics.get_nic("eth1").ip_addr506        bridge_dhcp_range = f"{guest_internal_ip},{guest_internal_ip}"507        # enable ip forwarding508        node.tools[Sysctl].write("net.ipv4.ip_forward", "1")509        # setup bridge510        node.tools[Ip].setup_bridge(bridge_name, f"{bridge_gateway}/{bridge_cidr}")511        node.tools[Ip].set_bridge_configuration(bridge_name, "stp_state", "0")512        node.tools[Ip].set_bridge_configuration(bridge_name, "forward_delay", "0")513        # reset bridge lease file to remove old dns leases514        node.execute(515            f"cp /dev/null /var/run/qemu-dnsmasq-{bridge_name}.leases", sudo=True516        )517        # start dnsmasq518        node.tools[Dnsmasq].start(bridge_name, bridge_gateway, bridge_dhcp_range)519        # reset filter table to accept all traffic520        node.tools[Iptables].reset_table()521        # reset nat table and setup nat forwarding522        node.tools[Iptables].reset_table("nat")523        node.tools[Iptables].run(524            f"-t nat -A POSTROUTING -s {bridge_network}/{bridge_cidr} -j MASQUERADE",525            sudo=True,526            force_run=True,527        )528        # start nested vm529        nested_vm = qemu_connect_nested_vm(530            node,531            guest_username,532            guest_password,533            guest_port,534            guest_image_url,535            taps=1,536            cores=core_count,537            bridge=bridge_name,538            stop_existing_vm=True,539            name=nested_vm_name,540        )541        # configure rc.local to run dhclient on reboot542        nested_vm.tools[StartConfiguration].add_command("ip link set dev ens4 up")543        nested_vm.tools[StartConfiguration].add_command("dhclient ens4")544        # reboot nested vm and close ssh connection545        nested_vm.execute("reboot", sudo=True)546        nested_vm.close()547        # route traffic on `eth0` and port `guest_port` on l1 vm to548        # port 22 on l2 vm549        node.tools[Iptables].run(550            f"-t nat -A PREROUTING -i eth0 -p tcp --dport {guest_port} "551            f"-j DNAT --to {guest_internal_ip}:22",552            sudo=True,553            force_run=True,554        )555        # route all tcp traffic on `eth1` port on l1 vm to l2 vm556        node.tools[Iptables].run(557            f"-t nat -A PREROUTING -i eth1 -d {node_eth1_ip} "558            f"-p tcp -j DNAT --to {guest_internal_ip}",559            sudo=True,560            force_run=True,561        )562        # wait till nested vm is up563        try_connect(564            schema.ConnectionInfo(565                address=node.public_address,566                port=guest_port,567                username=guest_username,568                password=guest_password,569            )570        )571        # set default nic interfaces on l2 vm572        nested_vm.internal_address = node_eth1_ip573        nested_vm.capability.network_interface = Synthetic()574        return nested_vm575    def _linux_cleanup_nat(576        self,577        node: RemoteNode,578        bridge_name: str,579        log: Logger,580    ) -> None:581        try:582            # stop running QEMU instances583            node.tools[Qemu].delete_vm()584            # clear bridge and taps585            node.tools[Ip].delete_interface(bridge_name)586            # flush ip tables587            node.tools[Iptables].reset_table()588            node.tools[Iptables].reset_table("nat")589        except Exception as e:...

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