#!/usr/bin/python # # Test cases for AP VLAN # Copyright (c) 2013-2014, Jouni Malinen # # This software may be distributed under the terms of the BSD license. # See README for more details. import time import subprocess import logging logger = logging.getLogger(__name__) try: import netifaces netifaces_imported = True except ImportError: netifaces_imported = False import hwsim_utils import hostapd from utils import iface_is_in_bridge, HwsimSkip import os from tshark import run_tshark def test_ap_vlan_open(dev, apdev): """AP VLAN with open network""" params = { "ssid": "test-vlan-open", "dynamic_vlan": "1", "accept_mac_file": "hostapd.accept" } hapd = hostapd.add_ap(apdev[0]['ifname'], params) dev[0].connect("test-vlan-open", key_mgmt="NONE", scan_freq="2412") dev[1].connect("test-vlan-open", key_mgmt="NONE", scan_freq="2412") dev[2].connect("test-vlan-open", key_mgmt="NONE", scan_freq="2412") hwsim_utils.test_connectivity_iface(dev[0], hapd, "brvlan1") hwsim_utils.test_connectivity_iface(dev[1], hapd, "brvlan2") hwsim_utils.test_connectivity(dev[2], hapd) def test_ap_vlan_file_open(dev, apdev): """AP VLAN with open network and vlan_file mapping""" params = { "ssid": "test-vlan-open", "dynamic_vlan": "1", "vlan_file": "hostapd.vlan", "accept_mac_file": "hostapd.accept" } hapd = hostapd.add_ap(apdev[0]['ifname'], params) dev[0].connect("test-vlan-open", key_mgmt="NONE", scan_freq="2412") dev[1].connect("test-vlan-open", key_mgmt="NONE", scan_freq="2412") dev[2].connect("test-vlan-open", key_mgmt="NONE", scan_freq="2412") hwsim_utils.test_connectivity_iface(dev[0], hapd, "brvlan1") hwsim_utils.test_connectivity_iface(dev[1], hapd, "brvlan2") hwsim_utils.test_connectivity(dev[2], hapd) def test_ap_vlan_wpa2(dev, apdev): """AP VLAN with WPA2-PSK""" params = hostapd.wpa2_params(ssid="test-vlan", passphrase="12345678") params['dynamic_vlan'] = "1"; params['accept_mac_file'] = "hostapd.accept"; hapd = hostapd.add_ap(apdev[0]['ifname'], params) dev[0].connect("test-vlan", psk="12345678", scan_freq="2412") dev[1].connect("test-vlan", psk="12345678", scan_freq="2412") dev[2].connect("test-vlan", psk="12345678", scan_freq="2412") hwsim_utils.test_connectivity_iface(dev[0], hapd, "brvlan1") hwsim_utils.test_connectivity_iface(dev[1], hapd, "brvlan2") hwsim_utils.test_connectivity(dev[2], hapd) def test_ap_vlan_wpa2_radius(dev, apdev): """AP VLAN with WPA2-Enterprise and RADIUS attributes""" params = hostapd.wpa2_eap_params(ssid="test-vlan") params['dynamic_vlan'] = "1"; hapd = hostapd.add_ap(apdev[0]['ifname'], params) dev[0].connect("test-vlan", key_mgmt="WPA-EAP", eap="PAX", identity="vlan1", password_hex="0123456789abcdef0123456789abcdef", scan_freq="2412") dev[1].connect("test-vlan", key_mgmt="WPA-EAP", eap="PAX", identity="vlan2", password_hex="0123456789abcdef0123456789abcdef", scan_freq="2412") dev[2].connect("test-vlan", key_mgmt="WPA-EAP", eap="PAX", identity="pax.user@example.com", password_hex="0123456789abcdef0123456789abcdef", scan_freq="2412") hwsim_utils.test_connectivity_iface(dev[0], hapd, "brvlan1") hwsim_utils.test_connectivity_iface(dev[1], hapd, "brvlan2") hwsim_utils.test_connectivity(dev[2], hapd) def test_ap_vlan_wpa2_radius_2(dev, apdev): """AP VLAN with WPA2-Enterprise and RADIUS EGRESS_VLANID attributes""" params = hostapd.wpa2_eap_params(ssid="test-vlan") params['dynamic_vlan'] = "1"; hapd = hostapd.add_ap(apdev[0]['ifname'], params) dev[0].connect("test-vlan", key_mgmt="WPA-EAP", eap="PAX", identity="vlan1b", password_hex="0123456789abcdef0123456789abcdef", scan_freq="2412") hwsim_utils.test_connectivity_iface(dev[0], hapd, "brvlan1") def test_ap_vlan_wpa2_radius_id_change(dev, apdev): """AP VLAN with WPA2-Enterprise and RADIUS attributes changing VLANID""" generic_ap_vlan_wpa2_radius_id_change(dev, apdev, False) def test_ap_vlan_tagged_wpa2_radius_id_change(dev, apdev): """AP tagged VLAN with WPA2-Enterprise and RADIUS attributes changing VLANID""" ifname1 = 'wlan0.1' ifname2 = 'wlan0.2' try: # Create tagged interface for wpa_supplicant subprocess.call(['ip', 'link', 'add', 'link', dev[0].ifname, 'name', ifname1, 'type', 'vlan', 'id', '1']) subprocess.call(['ifconfig', ifname1, 'up']) subprocess.call(['ip', 'link', 'add', 'link', dev[0].ifname, 'name', ifname2, 'type', 'vlan', 'id', '2']) subprocess.call(['ifconfig', ifname2, 'up']) generic_ap_vlan_wpa2_radius_id_change(dev, apdev, True) finally: subprocess.call(['ifconfig', ifname1, 'down']) subprocess.call(['ifconfig', ifname2, 'down']) subprocess.call(['ip', 'link', 'del', ifname1]) subprocess.call(['ip', 'link', 'del', ifname2]) def generic_ap_vlan_wpa2_radius_id_change(dev, apdev, tagged): as_params = { "ssid": "as", "beacon_int": "2000", "radius_server_clients": "auth_serv/radius_clients.conf", "radius_server_auth_port": '18128', "eap_server": "1", "eap_user_file": "auth_serv/eap_user.conf", "ca_cert": "auth_serv/ca.pem", "server_cert": "auth_serv/server.pem", "private_key": "auth_serv/server.key" } authserv = hostapd.add_ap(apdev[1]['ifname'], as_params) params = hostapd.wpa2_eap_params(ssid="test-vlan") params['dynamic_vlan'] = "1"; params['auth_server_port'] = "18128" hapd = hostapd.add_ap(apdev[0]['ifname'], params) identity = "vlan1tagged" if tagged else "vlan1" dev[0].connect("test-vlan", key_mgmt="WPA-EAP", eap="PAX", identity=identity, password_hex="0123456789abcdef0123456789abcdef", scan_freq="2412") if tagged: hwsim_utils.run_connectivity_test(dev[0], hapd, 0, ifname1="wlan0.1", ifname2="brvlan1") else: hwsim_utils.test_connectivity_iface(dev[0], hapd, "brvlan1") logger.info("VLAN-ID -> 2") authserv.disable() authserv.set('eap_user_file', "auth_serv/eap_user_vlan.conf") authserv.enable() dev[0].dump_monitor() dev[0].request("REAUTHENTICATE") ev = dev[0].wait_event(["CTRL-EVENT-EAP-SUCCESS"], timeout=15) if ev is None: raise Exception("EAP reauthentication timed out") ev = dev[0].wait_event(["WPA: Key negotiation completed"], timeout=5) if ev is None: raise Exception("4-way handshake after reauthentication timed out") state = dev[0].get_status_field('wpa_state') if state != "COMPLETED": raise Exception("Unexpected state after reauth: " + state) sta = hapd.get_sta(dev[0].own_addr()) if 'vlan_id' not in sta: raise Exception("No VLAN ID in STA info") if (not tagged) and (sta['vlan_id'] != '2'): raise Exception("Unexpected VLAN ID: " + sta['vlan_id']) if tagged: hwsim_utils.run_connectivity_test(dev[0], hapd, 0, ifname1="wlan0.2", ifname2="brvlan2") else: hwsim_utils.test_connectivity_iface(dev[0], hapd, "brvlan2") logger.info("VLAN-ID -> 1") time.sleep(1) authserv.disable() authserv.set('eap_user_file', "auth_serv/eap_user.conf") authserv.enable() dev[0].dump_monitor() dev[0].request("REAUTHENTICATE") ev = dev[0].wait_event(["CTRL-EVENT-EAP-SUCCESS"], timeout=15) if ev is None: raise Exception("EAP reauthentication timed out") ev = dev[0].wait_event(["WPA: Key negotiation completed"], timeout=5) if ev is None: raise Exception("4-way handshake after reauthentication timed out") state = dev[0].get_status_field('wpa_state') if state != "COMPLETED": raise Exception("Unexpected state after reauth: " + state) sta = hapd.get_sta(dev[0].own_addr()) if 'vlan_id' not in sta: raise Exception("No VLAN ID in STA info") if (not tagged) and (sta['vlan_id'] != '1'): raise Exception("Unexpected VLAN ID: " + sta['vlan_id']) time.sleep(0.2) try: if tagged: hwsim_utils.run_connectivity_test(dev[0], hapd, 0, ifname1="wlan0.1", ifname2="brvlan1") else: hwsim_utils.test_connectivity_iface(dev[0], hapd, "brvlan1") except Exception, e: # It is possible for new bridge setup to not be ready immediately, so # try again to avoid reporting issues related to that. logger.info("First VLAN-ID 1 data test failed - try again") if tagged: hwsim_utils.run_connectivity_test(dev[0], hapd, 0, ifname1="wlan0.1", ifname2="brvlan1") else: hwsim_utils.test_connectivity_iface(dev[0], hapd, "brvlan1") def test_ap_vlan_wpa2_radius_required(dev, apdev): """AP VLAN with WPA2-Enterprise and RADIUS attributes required""" params = hostapd.wpa2_eap_params(ssid="test-vlan") params['dynamic_vlan'] = "2"; hostapd.add_ap(apdev[0]['ifname'], params) dev[0].connect("test-vlan", key_mgmt="WPA-EAP", eap="PAX", identity="vlan1", password_hex="0123456789abcdef0123456789abcdef", scan_freq="2412") dev[2].connect("test-vlan", key_mgmt="WPA-EAP", eap="PAX", identity="pax.user@example.com", password_hex="0123456789abcdef0123456789abcdef", scan_freq="2412", wait_connect=False) ev = dev[2].wait_event(["CTRL-EVENT-CONNECTED", "CTRL-EVENT-DISCONNECTED"], timeout=20) if ev is None: raise Exception("Timeout on connection attempt") if "CTRL-EVENT-CONNECTED" in ev: raise Exception("Unexpected success without tunnel parameters") def test_ap_vlan_tagged(dev, apdev): """AP VLAN with tagged interface""" params = { "ssid": "test-vlan-open", "dynamic_vlan": "1", "vlan_tagged_interface": "lo", "accept_mac_file": "hostapd.accept" } hapd = hostapd.add_ap(apdev[0]['ifname'], params) dev[0].connect("test-vlan-open", key_mgmt="NONE", scan_freq="2412") dev[1].connect("test-vlan-open", key_mgmt="NONE", scan_freq="2412") dev[2].connect("test-vlan-open", key_mgmt="NONE", scan_freq="2412") hwsim_utils.test_connectivity_iface(dev[0], hapd, "brlo.1") hwsim_utils.test_connectivity_iface(dev[1], hapd, "brlo.2") hwsim_utils.test_connectivity(dev[2], hapd) def ap_vlan_iface_cleanup_multibss_cleanup(): subprocess.call(['ifconfig', 'dummy0', 'down'], stderr=open('/dev/null', 'w')) ifnames = [ 'wlan3.1', 'wlan3.2', 'wlan3-2.1', 'wlan3-2.2', 'dummy0.2', 'dummy0.1', 'dummy0', 'brvlan1', 'brvlan2' ] for ifname in ifnames: subprocess.call(['ip', 'link', 'del', ifname], stderr=open('/dev/null', 'w')) def ap_vlan_iface_test_and_prepare_environ(): ifaces = netifaces.interfaces() if "dummy0" in ifaces: raise Exception("dummy0 already exists before") ifaces = netifaces.interfaces() if "dummy0.1" in ifaces: raise Exception("dummy0.1 already exists before") subprocess.call(['ip', 'link', 'add', 'dummy0', 'type', 'dummy']) subprocess.call(['ifconfig', 'dummy0', 'up']) ifaces = netifaces.interfaces() if not("dummy0" in ifaces): raise HwsimSkip("failed to add dummy0 - missing kernel config DUMMY ?") subprocess.call(['ip', 'link', 'add', 'link', 'dummy0', 'name', 'dummy0.1', 'type', 'vlan', 'id', '1']) ifaces = netifaces.interfaces() if not("dummy0.1" in ifaces): raise HwsimSkip("failed to add dummy0.1 - missing kernel config VLAN_8021Q ?") subprocess.call(['ip', 'link', 'del', 'dummy0.1']) ifaces = netifaces.interfaces() if "dummy0.1" in ifaces: raise Exception("dummy0.1 was not removed before testing") def test_ap_vlan_iface_cleanup_multibss(dev, apdev): """AP VLAN operation in multi-BSS multi-VLAN case""" ap_vlan_iface_cleanup_multibss(dev, apdev, 'multi-bss-iface.conf') def ap_vlan_iface_cleanup_multibss(dev, apdev, cfgfile): # AP VLAN with WPA2-Enterprise and RADIUS attributes changing VLANID # check that multiple bss do not interfere with each other with respect # to deletion of bridge and tagged interface. if not netifaces_imported: raise HwsimSkip("python module netifaces not available") try: ap_vlan_iface_cleanup_multibss_cleanup() ap_vlan_iface_test_and_prepare_environ() as_params = { "ssid": "as", "beacon_int": "2000", "radius_server_clients": "auth_serv/radius_clients.conf", "radius_server_auth_port": '18128', "eap_server": "1", "eap_user_file": "auth_serv/eap_user.conf", "ca_cert": "auth_serv/ca.pem", "server_cert": "auth_serv/server.pem", "private_key": "auth_serv/server.key", "vlan_naming": "1" } authserv = hostapd.add_ap(apdev[1]['ifname'], as_params) ifname = apdev[0]['ifname'] # start the actual test hostapd.add_iface(ifname, cfgfile) hapd = hostapd.Hostapd(ifname) hapd1 = hostapd.Hostapd("wlan3-2", 1) hapd1.enable() ifaces = netifaces.interfaces() if "brvlan1" in ifaces: raise Exception("bridge brvlan1 already exists before") if "brvlan2" in ifaces: raise Exception("bridge brvlan2 already exists before") dev[0].connect("bss-1", key_mgmt="WPA-EAP", eap="PAX", identity="vlan1", password_hex="0123456789abcdef0123456789abcdef", scan_freq="2412") ifaces = netifaces.interfaces() if not("brvlan1" in ifaces): raise Exception("bridge brvlan1 was not created") hwsim_utils.test_connectivity_iface(dev[0], hapd, "brvlan1") if not iface_is_in_bridge("brvlan1", "dummy0.1"): raise Exception("dummy0.1 not in brvlan1") dev[1].connect("bss-2", key_mgmt="WPA-EAP", eap="PAX", identity="vlan1", password_hex="0123456789abcdef0123456789abcdef", scan_freq="2412") hwsim_utils.test_connectivity_iface(dev[1], hapd1, "brvlan1") if not iface_is_in_bridge("brvlan1", "dummy0.1"): raise Exception("dummy0.1 not in brvlan1") authserv.disable() authserv.set('eap_user_file', "auth_serv/eap_user_vlan.conf") authserv.enable() logger.info("wlan0 -> VLAN 2") dev[0].dump_monitor() dev[0].request("REAUTHENTICATE") ev = dev[0].wait_event(["CTRL-EVENT-EAP-SUCCESS"], timeout=15) if ev is None: raise Exception("EAP reauthentication timed out") ev = dev[0].wait_event(["WPA: Key negotiation completed"], timeout=5) if ev is None: raise Exception("4-way handshake after reauthentication timed out") state = dev[0].get_status_field('wpa_state') if state != "COMPLETED": raise Exception("Unexpected state after reauth: " + state) ifaces = netifaces.interfaces() if not ("brvlan1" in ifaces): raise Exception("bridge brvlan1 has been removed too early") hwsim_utils.test_connectivity_iface(dev[0], hapd, "brvlan2", max_tries=5) if not iface_is_in_bridge("brvlan2", "dummy0.2"): raise Exception("dummy0.2 not in brvlan2") logger.info("test wlan1 == VLAN 1") hwsim_utils.test_connectivity_iface(dev[1], hapd1, "brvlan1") if not iface_is_in_bridge("brvlan1", "dummy0.1"): raise Exception("dummy0.1 not in brvlan1") logger.info("wlan1 -> VLAN 2") dev[1].dump_monitor() dev[1].request("REAUTHENTICATE") ev = dev[1].wait_event(["CTRL-EVENT-EAP-SUCCESS"], timeout=15) if ev is None: raise Exception("EAP reauthentication timed out") ev = dev[1].wait_event(["WPA: Key negotiation completed"], timeout=5) if ev is None: raise Exception("4-way handshake after reauthentication timed out") state = dev[1].get_status_field('wpa_state') if state != "COMPLETED": raise Exception("Unexpected state after reauth: " + state) # it can take some time for data connectivity to be updated hwsim_utils.test_connectivity_iface(dev[1], hapd1, "brvlan2", max_tries=5) logger.info("test wlan0 == VLAN 2") hwsim_utils.test_connectivity_iface(dev[0], hapd, "brvlan2") if not iface_is_in_bridge("brvlan2", "dummy0.2"): raise Exception("dummy0.2 not in brvlan2") ifaces = netifaces.interfaces() if "brvlan1" in ifaces: raise Exception("bridge brvlan1 has not been cleaned up") # disconnect dev0 first to test a corner case dev[0].request("DISCONNECT") dev[0].wait_disconnected() dev[1].request("DISCONNECT") dev[1].wait_disconnected() # station removal needs some time for i in range(5): time.sleep(1) ifaces = netifaces.interfaces() if "brvlan2" not in ifaces: break ifaces = netifaces.interfaces() if "brvlan2" in ifaces: raise Exception("bridge brvlan2 has not been cleaned up") hapd.request("DISABLE") finally: ap_vlan_iface_cleanup_multibss_cleanup() def test_ap_vlan_iface_cleanup_multibss_per_sta_vif(dev, apdev): """AP VLAN operation in multi-BSS multi-VLAN case with per-sta-vif set""" # AP VLAN with WPA2-Enterprise and RADIUS attributes changing VLANID # check that multiple bss do not interfere with each other with respect # to deletion of bridge and tagged interface. per_sta_vif is enabled. ap_vlan_iface_cleanup_multibss(dev, apdev, 'multi-bss-iface-per_sta_vif.conf') def test_ap_vlan_without_station(dev, apdev, p): """AP VLAN with WPA2-PSK and no station""" try: subprocess.call(['brctl', 'addbr', 'brvlan1']) subprocess.call(['brctl', 'setfd', 'brvlan1', '0']) subprocess.call(['ifconfig', 'brvlan1', 'up']) # use a passphrase wlantest does not know, so it cannot # inject decrypted frames into pcap params = hostapd.wpa2_params(ssid="test-vlan", passphrase="12345678x") params['dynamic_vlan'] = "1"; params['vlan_file'] = 'hostapd.wlan3.vlan' params['accept_mac_file'] = "hostapd.accept"; hapd = hostapd.add_ap(apdev[0]['ifname'], params) # inject some traffic sa = hapd.own_addr() da = "ff:ff:ff:ff:ff:00" hapd.request('DATA_TEST_CONFIG 1 ifname=brvlan1') hapd.request('DATA_TEST_TX {} {} 0'.format(da, sa)) hapd.request('DATA_TEST_CONFIG 0') time.sleep(.1) dev[0].connect("test-vlan", psk="12345678x", scan_freq="2412") # inject some traffic sa = hapd.own_addr() da = "ff:ff:ff:ff:ff:01" hapd.request('DATA_TEST_CONFIG 1 ifname=brvlan1') hapd.request('DATA_TEST_TX {} {} 0'.format(da, sa)) hapd.request('DATA_TEST_CONFIG 0') # let the AP send couple of Beacon frames time.sleep(1) out = run_tshark(os.path.join(p['logdir'], "hwsim0.pcapng"), "wlan.da == ff:ff:ff:ff:ff:00", ["wlan.fc.protected"]) if out is not None: lines = out.splitlines() if len(lines) < 1: raise Exception("first frame not observed") state = 1 for l in lines: is_protected = int(l, 16) if is_protected != 1: state = 0 if state != 1: raise Exception("Broadcast packets were not encrypted when no station was connected") else: raise Exception("first frame not observed") out = run_tshark(os.path.join(p['logdir'], "hwsim0.pcapng"), "wlan.da == ff:ff:ff:ff:ff:01", ["wlan.fc.protected"]) if out is not None: lines = out.splitlines() if len(lines) < 1: raise Exception("second frame not observed") state = 1 for l in lines: is_protected = int(l, 16) if is_protected != 1: state = 0 if state != 1: raise Exception("Broadcast packets were not encrypted when station was connected") else: raise Exception("second frame not observed") dev[0].request("DISCONNECT") dev[0].wait_disconnected() finally: subprocess.call(['ip', 'link', 'set', 'dev', 'brvlan1', 'down']) subprocess.call(['ip', 'link', 'set', 'dev', 'wlan3.1', 'down'], stderr=open('/dev/null', 'w')) subprocess.call(['brctl', 'delif', 'brvlan1', 'wlan3.1'], stderr=open('/dev/null', 'w')) subprocess.call(['brctl', 'delbr', 'brvlan1']) def test_ap_open_per_sta_vif(dev, apdev): """AP VLAN with open network""" params = { "ssid": "test-vlan-open", "per_sta_vif": "1" } hapd = hostapd.add_ap(apdev[0]['ifname'], params) dev[0].connect("test-vlan-open", key_mgmt="NONE", scan_freq="2412") hwsim_utils.test_connectivity_iface(dev[0], hapd, apdev[0]['ifname'] + ".4096") def test_ap_vlan_open_per_sta_vif(dev, apdev): """AP VLAN (dynamic) with open network""" params = { "ssid": "test-vlan-open", "per_sta_vif": "1", "dynamic_vlan": "1" } hapd = hostapd.add_ap(apdev[0]['ifname'], params) dev[0].connect("test-vlan-open", key_mgmt="NONE", scan_freq="2412") hwsim_utils.test_connectivity_iface(dev[0], hapd, apdev[0]['ifname'] + ".4096") def test_ap_vlan_wpa2_radius_tagged(dev, apdev): """AP VLAN with WPA2-Enterprise and RADIUS EGRESS_VLANID attributes""" ifname = 'wlan0.1' try: params = hostapd.wpa2_eap_params(ssid="test-vlan") params['dynamic_vlan'] = "1" params["vlan_naming"] = "1" hapd = hostapd.add_ap(apdev[0]['ifname'], params) dev[0].connect("test-vlan", key_mgmt="WPA-EAP", eap="PAX", identity="vlan1tagged", password_hex="0123456789abcdef0123456789abcdef", scan_freq="2412") # Create tagged interface for wpa_supplicant subprocess.call(['ip', 'link', 'add', 'link', dev[0].ifname, 'name', ifname, 'type', 'vlan', 'id', '1']) subprocess.call(['ifconfig', ifname, 'up']) hwsim_utils.run_connectivity_test(dev[0], hapd, 0, ifname1=ifname, ifname2="brvlan1") finally: subprocess.call(['ifconfig', ifname, 'down']) subprocess.call(['ip', 'link', 'del', ifname]) def test_ap_vlan_wpa2_radius_mixed(dev, apdev): """AP VLAN with WPA2-Enterprise and tagged+untagged VLANs""" ifname = 'wlan0.1' try: params = hostapd.wpa2_eap_params(ssid="test-vlan") params['dynamic_vlan'] = "1" params["vlan_naming"] = "1" hapd = hostapd.add_ap(apdev[0]['ifname'], params) dev[0].connect("test-vlan", key_mgmt="WPA-EAP", eap="PAX", identity="vlan12mixed", password_hex="0123456789abcdef0123456789abcdef", scan_freq="2412") # Add tagged VLAN interface to wpa_supplicant interface for testing subprocess.call(['ip', 'link', 'add', 'link', dev[0].ifname, 'name', ifname, 'type', 'vlan', 'id', '1']) subprocess.call(['ifconfig', ifname, 'up']) logger.info("Test connectivity in untagged VLAN 2") hwsim_utils.run_connectivity_test(dev[0], hapd, 0, ifname1=dev[0].ifname, ifname2="brvlan2") logger.info("Test connectivity in tagged VLAN 1") hwsim_utils.run_connectivity_test(dev[0], hapd, 0, ifname1=ifname, ifname2="brvlan1") finally: subprocess.call(['ifconfig', ifname, 'down']) subprocess.call(['ip', 'link', 'del', ifname])