wireless: T1627: initial rewrite in XML/Python style

Working:
- Wireless modes b, g, n, ac
- WPA/WPA2 psk and RADIUS (tested using Microsoft NPS)

1 files changed, 1351 insertions, 0 deletions

diff --git a/src/conf_mode/interfaces-wireless.py b/src/conf_mode/interfaces-wireless.py
new file mode 100755
index 000000000..713b592e1
--- /dev/null
+++ b/src/conf_mode/interfaces-wireless.py
@@ -0,0 +1,1351 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2019 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+
+from jinja2 import Template
+from copy import deepcopy
+from sys import exit
+from stat import S_IRWXU,S_IRGRP,S_IXGRP,S_IROTH,S_IXOTH
+from pwd import getpwnam
+from grp import getgrnam
+
+from subprocess import Popen, PIPE
+from psutil import pid_exists
+
+from vyos.ifconfig import EthernetIf, VLANIf
+from vyos.configdict import list_diff, vlan_to_dict
+from vyos.config import Config
+from vyos import ConfigError
+
+user = 'root'
+group = 'vyattacfg'
+
+# Please be careful if you edit the template.
+config_hostapd_tmpl = """
+### Autogenerated by interfaces-wireless.py ###
+{% if description %}
+# Description: {{ description }}
+# User-friendly description of device; up to 32 octets encoded in UTF-8
+device_name={{ description | truncate(32, True) }}
+{% endif %}
+
+# AP netdevice name (without 'ap' postfix, i.e., wlan0 uses wlan0ap for
+# management frames with the Host AP driver); wlan0 with many nl80211 drivers
+# Note: This attribute can be overridden by the values supplied with the '-i'
+# command line parameter.
+interface={{ intf }}
+
+# Driver interface type (hostap/wired/none/nl80211/bsd);
+# default: hostap). nl80211 is used with all Linux mac80211 drivers.
+# Use driver=none if building hostapd as a standalone RADIUS server that does
+# not control any wireless/wired driver.
+driver=nl80211
+
+#
+# What about bridge?
+#   bridge=br0
+#   wds_sta=1
+#
+
+# Levels (minimum value for logged events):
+#  0 = verbose debugging
+#  1 = debugging
+#  2 = informational messages
+#  3 = notification
+#  4 = warning
+logger_syslog=-1
+logger_syslog_level=0
+logger_stdout=-1
+logger_stdout_level=0
+
+{%- if country_code %}
+
+# Country code (ISO/IEC 3166-1). Used to set regulatory domain.
+# Set as needed to indicate country in which device is operating.
+# This can limit available channels and transmit power.
+country_code={{ country_code }}
+
+# Enable IEEE 802.11d. This advertises the country_code and the set of allowed
+# channels and transmit power levels based on the regulatory limits. The
+# country_code setting must be configured with the correct country for
+# IEEE 802.11d functions.
+ieee80211d=1
+{% endif %}
+
+{%- if ssid %}
+
+# SSID to be used in IEEE 802.11 management frames
+ssid={{ ssid }}
+{% endif %}
+
+{%- if channel %}
+
+# Channel number (IEEE 802.11)
+# (default: 0, i.e., not set)
+# Please note that some drivers do not use this value from hostapd and the
+# channel will need to be configured separately with iwconfig.
+#
+# If CONFIG_ACS build option is enabled, the channel can be selected
+# automatically at run time by setting channel=acs_survey or channel=0, both of
+# which will enable the ACS survey based algorithm.
+channel={{ channel }}
+{% endif %}
+
+{%- if mode %}
+
+# Operation mode (a = IEEE 802.11a (5 GHz), b = IEEE 802.11b (2.4 GHz),
+# g = IEEE 802.11g (2.4 GHz), ad = IEEE 802.11ad (60 GHz); a/g options are used
+# with IEEE 802.11n (HT), too, to specify band). For IEEE 802.11ac (VHT), this
+# needs to be set to hw_mode=a. For IEEE 802.11ax (HE) on 6 GHz this needs
+# to be set to hw_mode=a. When using ACS (see channel parameter), a
+# special value "any" can be used to indicate that any support band can be used.
+# This special case is currently supported only with drivers with which
+# offloaded ACS is used.
+{% if 'n' in mode -%}
+hw_mode=g
+ieee80211n=1
+{% elif 'ac' in mode -%}
+hw_mode=a
+ieee80211h=1
+ieee80211ac=1
+{% else -%}
+hw_mode={{ mode }}
+{% endif %}
+{% endif %}
+
+# ieee80211w: Whether management frame protection (MFP) is enabled
+# 0 = disabled (default)
+# 1 = optional
+# 2 = required
+{% if 'disabled' in mgmt_frame_protection -%}
+ieee80211w=0
+{% elif 'optional' in mgmt_frame_protection -%}
+ieee80211w=1
+{% elif 'required' in mgmt_frame_protection -%}
+ieee80211w=2
+{% endif %}
+
+# ht_capab: HT capabilities (list of flags)
+# LDPC coding capability: [LDPC] = supported
+# Supported channel width set: [HT40-] = both 20 MHz and 40 MHz with secondary
+#	channel below the primary channel; [HT40+] = both 20 MHz and 40 MHz
+#	with secondary channel above the primary channel
+#	(20 MHz only if neither is set)
+#	Note: There are limits on which channels can be used with HT40- and
+#	HT40+. Following table shows the channels that may be available for
+#	HT40- and HT40+ use per IEEE 802.11n Annex J:
+#	freq		HT40-		HT40+
+#	2.4 GHz		5-13		1-7 (1-9 in Europe/Japan)
+#	5 GHz		40,48,56,64	36,44,52,60
+#	(depending on the location, not all of these channels may be available
+#	for use)
+#	Please note that 40 MHz channels may switch their primary and secondary
+#	channels if needed or creation of 40 MHz channel maybe rejected based
+#	on overlapping BSSes. These changes are done automatically when hostapd
+#	is setting up the 40 MHz channel.
+# Spatial Multiplexing (SM) Power Save: [SMPS-STATIC] or [SMPS-DYNAMIC]
+#	(SMPS disabled if neither is set)
+# HT-greenfield: [GF] (disabled if not set)
+# Short GI for 20 MHz: [SHORT-GI-20] (disabled if not set)
+# Short GI for 40 MHz: [SHORT-GI-40] (disabled if not set)
+# Tx STBC: [TX-STBC] (disabled if not set)
+# Rx STBC: [RX-STBC1] (one spatial stream), [RX-STBC12] (one or two spatial
+#	streams), or [RX-STBC123] (one, two, or three spatial streams); Rx STBC
+#	disabled if none of these set
+# HT-delayed Block Ack: [DELAYED-BA] (disabled if not set)
+# Maximum A-MSDU length: [MAX-AMSDU-7935] for 7935 octets (3839 octets if not
+#	set)
+# DSSS/CCK Mode in 40 MHz: [DSSS_CCK-40] = allowed (not allowed if not set)
+# 40 MHz intolerant [40-INTOLERANT] (not advertised if not set)
+# L-SIG TXOP protection support: [LSIG-TXOP-PROT] (disabled if not set)
+ht_capab=
+
+{%- if cap_ht_40mhz_incapable -%}
+[40-INTOLERANT]
+{%- endif -%}
+
+{%- if cap_ht_delayed_block_ack -%}
+[DELAYED-BA]
+{%- endif -%}
+
+{%- if cap_ht_dsss_cck_40 -%}
+[DSSS_CCK-40]
+{%- endif -%}
+
+{%- if cap_ht_greenfield -%}
+[GF]
+{%- endif -%}
+
+{%- if cap_ht_ldpc -%}
+[LDPC]
+{%- endif -%}
+
+{%- if cap_ht_lsig_protection -%}
+[LSIG-TXOP-PROT]
+{%- endif -%}
+
+{%- if cap_ht_max_amsdu -%}
+[MAX-AMSDU-{{ cap_ht_max_amsdu }}]
+{%- endif -%}
+
+{%- if cap_ht_smps -%}
+[SMPS-{{ cap_ht_smps | upper }}]
+{%- endif -%}
+
+{%- if cap_ht_chan_set_width -%}
+{%- for csw in cap_ht_chan_set_width -%}
+[{{ csw | upper }}]
+{%- endfor -%}
+{%- endif -%}
+
+{%- if cap_ht_short_gi -%}
+{%- for gi in cap_ht_short_gi -%}
+[SHORT-GI-{{ gi }}]
+{%- endfor -%}
+{%- endif -%}
+
+{%- if cap_ht_stbc_tx -%}
+[TX-STBC]
+{%- endif -%}
+{%- if cap_ht_stbc_rx -%}
+[RX-STBC{{ cap_ht_stbc_rx }}]
+{%- endif %}
+
+# Required for full HT and VHT functionality
+wme_enabled=1
+
+{% if cap_ht_powersave -%}
+# WMM-PS Unscheduled Automatic Power Save Delivery [U-APSD]
+# Enable this flag if U-APSD supported outside hostapd (eg., Firmware/driver)
+uapsd_advertisement_enabled=1
+{%- endif %}
+
+{% if cap_req_ht -%}
+# Require stations to support HT PHY (reject association if they do not)
+require_ht=1
+{% endif %}
+
+# vht_capab: VHT capabilities (list of flags)
+#
+# vht_max_mpdu_len: [MAX-MPDU-7991] [MAX-MPDU-11454]
+# Indicates maximum MPDU length
+# 0 = 3895 octets (default)
+# 1 = 7991 octets
+# 2 = 11454 octets
+# 3 = reserved
+#
+# supported_chan_width: [VHT160] [VHT160-80PLUS80]
+# Indicates supported Channel widths
+# 0 = 160 MHz & 80+80 channel widths are not supported (default)
+# 1 = 160 MHz channel width is supported
+# 2 = 160 MHz & 80+80 channel widths are supported
+# 3 = reserved
+#
+# Rx LDPC coding capability: [RXLDPC]
+# Indicates support for receiving LDPC coded pkts
+# 0 = Not supported (default)
+# 1 = Supported
+#
+# Short GI for 80 MHz: [SHORT-GI-80]
+# Indicates short GI support for reception of packets transmitted with TXVECTOR
+# params format equal to VHT and CBW = 80Mhz
+# 0 = Not supported (default)
+# 1 = Supported
+#
+# Short GI for 160 MHz: [SHORT-GI-160]
+# Indicates short GI support for reception of packets transmitted with TXVECTOR
+# params format equal to VHT and CBW = 160Mhz
+# 0 = Not supported (default)
+# 1 = Supported
+#
+# Tx STBC: [TX-STBC-2BY1]
+# Indicates support for the transmission of at least 2x1 STBC
+# 0 = Not supported (default)
+# 1 = Supported
+#
+# Rx STBC: [RX-STBC-1] [RX-STBC-12] [RX-STBC-123] [RX-STBC-1234]
+# Indicates support for the reception of PPDUs using STBC
+# 0 = Not supported (default)
+# 1 = support of one spatial stream
+# 2 = support of one and two spatial streams
+# 3 = support of one, two and three spatial streams
+# 4 = support of one, two, three and four spatial streams
+# 5,6,7 = reserved
+#
+# SU Beamformer Capable: [SU-BEAMFORMER]
+# Indicates support for operation as a single user beamformer
+# 0 = Not supported (default)
+# 1 = Supported
+#
+# SU Beamformee Capable: [SU-BEAMFORMEE]
+# Indicates support for operation as a single user beamformee
+# 0 = Not supported (default)
+# 1 = Supported
+#
+# Compressed Steering Number of Beamformer Antennas Supported:
+# [BF-ANTENNA-2] [BF-ANTENNA-3] [BF-ANTENNA-4]
+#   Beamformee's capability indicating the maximum number of beamformer
+#   antennas the beamformee can support when sending compressed beamforming
+#   feedback
+# If SU beamformer capable, set to maximum value minus 1
+# else reserved (default)
+#
+# Number of Sounding Dimensions:
+# [SOUNDING-DIMENSION-2] [SOUNDING-DIMENSION-3] [SOUNDING-DIMENSION-4]
+# Beamformer's capability indicating the maximum value of the NUM_STS parameter
+# in the TXVECTOR of a VHT NDP
+# If SU beamformer capable, set to maximum value minus 1
+# else reserved (default)
+#
+# MU Beamformer Capable: [MU-BEAMFORMER]
+# Indicates support for operation as an MU beamformer
+# 0 = Not supported or sent by Non-AP STA (default)
+# 1 = Supported
+#
+# VHT TXOP PS: [VHT-TXOP-PS]
+# Indicates whether or not the AP supports VHT TXOP Power Save Mode
+#  or whether or not the STA is in VHT TXOP Power Save mode
+# 0 = VHT AP doesn't support VHT TXOP PS mode (OR) VHT STA not in VHT TXOP PS
+#  mode
+# 1 = VHT AP supports VHT TXOP PS mode (OR) VHT STA is in VHT TXOP power save
+#  mode
+#
+# +HTC-VHT Capable: [HTC-VHT]
+# Indicates whether or not the STA supports receiving a VHT variant HT Control
+# field.
+# 0 = Not supported (default)
+# 1 = supported
+#
+# Maximum A-MPDU Length Exponent: [MAX-A-MPDU-LEN-EXP0]..[MAX-A-MPDU-LEN-EXP7]
+# Indicates the maximum length of A-MPDU pre-EOF padding that the STA can recv
+# This field is an integer in the range of 0 to 7.
+# The length defined by this field is equal to
+# 2 pow(13 + Maximum A-MPDU Length Exponent) -1 octets
+#
+# VHT Link Adaptation Capable: [VHT-LINK-ADAPT2] [VHT-LINK-ADAPT3]
+# Indicates whether or not the STA supports link adaptation using VHT variant
+# HT Control field
+# If +HTC-VHTcapable is 1
+#  0 = (no feedback) if the STA does not provide VHT MFB (default)
+#  1 = reserved
+#  2 = (Unsolicited) if the STA provides only unsolicited VHT MFB
+#  3 = (Both) if the STA can provide VHT MFB in response to VHT MRQ and if the
+#      STA provides unsolicited VHT MFB
+# Reserved if +HTC-VHTcapable is 0
+#
+# Rx Antenna Pattern Consistency: [RX-ANTENNA-PATTERN]
+# Indicates the possibility of Rx antenna pattern change
+# 0 = Rx antenna pattern might change during the lifetime of an association
+# 1 = Rx antenna pattern does not change during the lifetime of an association
+#
+# Tx Antenna Pattern Consistency: [TX-ANTENNA-PATTERN]
+# Indicates the possibility of Tx antenna pattern change
+# 0 = Tx antenna pattern might change during the lifetime of an association
+# 1 = Tx antenna pattern does not change during the lifetime of an association
+vht_capab=
+
+{%- if cap_vht_max_mpdu -%}
+[MAX-MPDU-{{ cap_vht_max_mpdu }}]
+{%- endif -%}
+
+{%- if cap_vht_max_mpdu_exp -%}
+[MAX-A-MPDU-LEN-EXP{{ cap_vht_max_mpdu_exp }}]
+{%- endif -%}
+
+{%- if cap_vht_chan_set_width -%}
+[MAX-A-MPDU-LEN-EXP{{ cap_vht_max_mpdu_exp }}]
+{%- endif -%}
+
+{%- if cap_vht_chan_set_width -%}
+{%- if '2' in cap_vht_chan_set_width -%}
+[VHT160]
+{%- elif '3' in cap_vht_chan_set_width -%}
+[VHT160-80PLUS80]
+{%- endif -%}
+{%- endif -%}
+
+{%- if cap_vht_stbc_tx -%}
+[TX-STBC-2BY1]
+{%- endif -%}
+
+{%- if cap_vht_stbc_rx -%}
+[RX-STBC-{{ cap_vht_stbc_rx }}]
+{%- endif -%}
+
+{%- if cap_vht_link_adaptation -%}
+{%- if 'unsolicited' in cap_vht_link_adaptation -%}
+[VHT-LINK-ADAPT2]
+{%- elif 'both' in cap_vht_link_adaptation -%}
+[VHT-LINK-ADAPT3]
+{%- endif -%}
+{%- endif -%}
+
+{%- if cap_vht_short_gi -%}
+{%- for gi in cap_vht_short_gi -%}
+[SHORT-GI-{{ gi }}]
+{%- endfor -%}
+{%- endif -%}
+
+{%- if cap_vht_ldpc -%}
+[RXLDPC]
+{%- endif -%}
+
+{%- if cap_vht_tx_powersave -%}
+[VHT-TXOP-PS]
+{%- endif -%}
+
+{%- if cap_vht_vht_cf -%}
+[HTC-VHT]
+{%- endif -%}
+
+{%- if cap_vht_beamform -%}
+{%- for beamform in cap_vht_beamform -%}
+{%- if 'single-user-beamformer' in beamform -%}
+[SU-BEAMFORMER]
+{%- elif 'single-user-beamformee' in beamform -%}
+[SU-BEAMFORMEE]
+{%- elif 'multi-user-beamformer' in beamform -%}
+[MU-BEAMFORMER]
+{%- elif 'multi-user-beamformee' in beamform -%}
+[MU-BEAMFORMEE]
+{%- endif -%}
+{%- endfor -%}
+{%- endif -%}
+
+{%- if cap_vht_antenna_fixed -%}
+[RX-ANTENNA-PATTERN][TX-ANTENNA-PATTERN]
+{%- endif -%}
+
+{%- if cap_vht_antenna_cnt -%}
+{%- for beamform in cap_vht_beamform -%}
+{%- if 'single-user-beamformer' in beamform -%}
+[BF-ANTENNA-{{ cap_vht_antenna_cnt|int -1 }}][SOUNDING-DIMENSION-{{ cap_vht_antenna_cnt|int -1}}]
+{%- else -%}
+[BF-ANTENNA-{{ cap_vht_antenna_cnt }}][SOUNDING-DIMENSION-{{ cap_vht_antenna_cnt }}]
+{%- endif -%}
+{%- endfor -%}
+{%- endif %}
+
+# ieee80211n: Whether IEEE 802.11n (HT) is enabled
+# 0 = disabled (default)
+# 1 = enabled
+# Note: You will also need to enable WMM for full HT functionality.
+# Note: hw_mode=g (2.4 GHz) and hw_mode=a (5 GHz) is used to specify the band.
+{% if cap_req_vht -%}
+ieee80211n=0
+# Require stations to support VHT PHY (reject association if they do not)
+require_vht=1
+{% endif %}
+
+{% if cap_vht_center_freq_1 -%}
+# center freq = 5 GHz + (5 * index)
+# So index 42 gives center freq 5.210 GHz
+# which is channel 42 in 5G band
+vht_oper_centr_freq_seg0_idx={{ cap_vht_center_freq_1 }}
+{% endif %}
+
+{% if cap_vht_center_freq_2 -%}
+# center freq = 5 GHz + (5 * index)
+# So index 159 gives center freq 5.795 GHz
+# which is channel 159 in 5G band
+vht_oper_centr_freq_seg1_idx={{ cap_vht_center_freq_2 }}
+{% endif %}
+
+{% if disable_broadcast_ssid -%}
+# Send empty SSID in beacons and ignore probe request frames that do not
+# specify full SSID, i.e., require stations to know SSID.
+# default: disabled (0)
+# 1 = send empty (length=0) SSID in beacon and ignore probe request for
+#     broadcast SSID
+# 2 = clear SSID (ASCII 0), but keep the original length (this may be required
+#     with some clients that do not support empty SSID) and ignore probe
+#     requests for broadcast SSID
+ignore_broadcast_ssid=1
+{% endif %}
+
+# Station MAC address -based authentication
+# Please note that this kind of access control requires a driver that uses
+# hostapd to take care of management frame processing and as such, this can be
+# used with driver=hostap or driver=nl80211, but not with driver=atheros.
+# 0 = accept unless in deny list
+# 1 = deny unless in accept list
+# 2 = use external RADIUS server (accept/deny lists are searched first)
+macaddr_acl=0
+
+{% if max_stations -%}
+# Maximum number of stations allowed in station table. New stations will be
+# rejected after the station table is full. IEEE 802.11 has a limit of 2007
+# different association IDs, so this number should not be larger than that.
+# (default: 2007)
+max_num_sta={{ max_stations }}
+{% endif %}
+
+{% if isolate_stations -%}
+# Client isolation can be used to prevent low-level bridging of frames between
+# associated stations in the BSS. By default, this bridging is allowed.
+ap_isolate=1
+{% endif %}
+
+{% if reduce_transmit_power -%}
+# Add Power Constraint element to Beacon and Probe Response frames
+# This config option adds Power Constraint element when applicable and Country
+# element is added. Power Constraint element is required by Transmit Power
+# Control. This can be used only with ieee80211d=1.
+# Valid values are 0..255.
+local_pwr_constraint={{ reduce_transmit_power }}
+{% endif %}
+
+{% if expunge_failing_stations -%}
+# Disassociate stations based on excessive transmission failures or other
+# indications of connection loss. This depends on the driver capabilities and
+# may not be available with all drivers.
+disassoc_low_ack=1
+{% endif %}
+
+{% if sec_wep -%}
+# IEEE 802.11 specifies two authentication algorithms. hostapd can be
+# configured to allow both of these or only one. Open system authentication
+# should be used with IEEE 802.1X.
+# Bit fields of allowed authentication algorithms:
+# bit 0 = Open System Authentication
+# bit 1 = Shared Key Authentication (requires WEP)
+auth_algs=2
+
+# WEP rekeying (disabled if key lengths are not set or are set to 0)
+# Key lengths for default/broadcast and individual/unicast keys:
+# 5 = 40-bit WEP (also known as 64-bit WEP with 40 secret bits)
+# 13 = 104-bit WEP (also known as 128-bit WEP with 104 secret bits)
+wep_key_len_broadcast=5
+wep_key_len_unicast=5
+
+# Static WEP key configuration
+#
+# The key number to use when transmitting.
+# It must be between 0 and 3, and the corresponding key must be set.
+# default: not set
+wep_default_key=0
+
+# The WEP keys to use.
+# A key may be a quoted string or unquoted hexadecimal digits.
+# The key length should be 5, 13, or 16 characters, or 10, 26, or 32
+# digits, depending on whether 40-bit (64-bit), 104-bit (128-bit), or
+# 128-bit (152-bit) WEP is used.
+# Only the default key must be supplied; the others are optional.
+{% if sec_wep_key -%}
+{% for key in sec_wep_key -%}
+wep_key{{ loop.index -1 }}={{ key}}
+{% endfor %}
+{%- endif %}
+
+{% elif sec_wpa -%}
+##### WPA/IEEE 802.11i configuration ##########################################
+
+# Enable WPA. Setting this variable configures the AP to require WPA (either
+# WPA-PSK or WPA-RADIUS/EAP based on other configuration). For WPA-PSK, either
+# wpa_psk or wpa_passphrase must be set and wpa_key_mgmt must include WPA-PSK.
+# Instead of wpa_psk / wpa_passphrase, wpa_psk_radius might suffice.
+# For WPA-RADIUS/EAP, ieee8021x must be set (but without dynamic WEP keys),
+# RADIUS authentication server must be configured, and WPA-EAP must be included
+# in wpa_key_mgmt.
+# This field is a bit field that can be used to enable WPA (IEEE 802.11i/D3.0)
+# and/or WPA2 (full IEEE 802.11i/RSN):
+# bit0 = WPA
+# bit1 = IEEE 802.11i/RSN (WPA2) (dot11RSNAEnabled)
+{% if 'both' in sec_wpa_mode -%}
+wpa=3
+{%- elif 'wpa2' in sec_wpa_mode -%}
+wpa=2
+{%- elif 'wpa' in sec_wpa_mode -%}
+wpa=1
+{%- endif %}
+
+{% if sec_wpa_cipher -%}
+# Set of accepted cipher suites (encryption algorithms) for pairwise keys
+# (unicast packets). This is a space separated list of algorithms:
+# CCMP = AES in Counter mode with CBC-MAC (CCMP-128)
+# TKIP = Temporal Key Integrity Protocol
+# CCMP-256 = AES in Counter mode with CBC-MAC with 256-bit key
+# GCMP = Galois/counter mode protocol (GCMP-128)
+# GCMP-256 = Galois/counter mode protocol with 256-bit key
+# Group cipher suite (encryption algorithm for broadcast and multicast frames)
+# is automatically selected based on this configuration. If only CCMP is
+# allowed as the pairwise cipher, group cipher will also be CCMP. Otherwise,
+# TKIP will be used as the group cipher. The optional group_cipher parameter can
+# be used to override this automatic selection.
+{% if 'wpa2' in sec_wpa_mode -%}
+# Pairwise cipher for RSN/WPA2 (default: use wpa_pairwise value)
+rsn_pairwise={{ sec_wpa_cipher | join(" ") }}
+{% else -%}
+# Pairwise cipher for WPA (v1) (default: TKIP)
+wpa_pairwise={{ sec_wpa_cipher | join(" ") }}
+{%- endif -%}
+{% endif %}
+
+{% if sec_wpa_passphrase -%}
+# IEEE 802.11 specifies two authentication algorithms. hostapd can be
+# configured to allow both of these or only one. Open system authentication
+# should be used with IEEE 802.1X.
+# Bit fields of allowed authentication algorithms:
+# bit 0 = Open System Authentication
+# bit 1 = Shared Key Authentication (requires WEP)
+auth_algs=1
+
+# Set of accepted key management algorithms (WPA-PSK, WPA-EAP, or both). The
+# entries are separated with a space. WPA-PSK-SHA256 and WPA-EAP-SHA256 can be
+# added to enable SHA256-based stronger algorithms.
+# WPA-PSK = WPA-Personal / WPA2-Personal
+# WPA-PSK-SHA256 = WPA2-Personal using SHA256
+wpa_key_mgmt=WPA-PSK
+
+# WPA pre-shared keys for WPA-PSK. This can be either entered as a 256-bit
+# secret in hex format (64 hex digits), wpa_psk, or as an ASCII passphrase
+# (8..63 characters) that will be converted to PSK. This conversion uses SSID
+# so the PSK changes when ASCII passphrase is used and the SSID is changed.
+wpa_passphrase={{ sec_wpa_passphrase }}
+
+{% elif sec_wpa_radius -%}
+##### IEEE 802.1X-2004 related configuration ##################################
+# Require IEEE 802.1X authorization
+ieee8021x=1
+
+# Set of accepted key management algorithms (WPA-PSK, WPA-EAP, or both). The
+# entries are separated with a space. WPA-PSK-SHA256 and WPA-EAP-SHA256 can be
+# added to enable SHA256-based stronger algorithms.
+# WPA-EAP = WPA-Enterprise / WPA2-Enterprise
+# WPA-EAP-SHA256 = WPA2-Enterprise using SHA256
+wpa_key_mgmt=WPA-EAP
+
+{% for radius in sec_wpa_radius -%}
+auth_server_addr={{ radius.server }}
+auth_server_port={{ radius.port }}
+auth_server_shared_secret={{ radius.secret }}
+{% if radius.accounting -%}
+acct_server_addr={{ radius.server }}
+acct_server_port={{ radius.acc_port }}
+acct_server_shared_secret={{ radius.secret }}
+{% endif %}
+{% endfor %}
+
+{% endif %}
+
+{% else %}
+# Open system
+auth_algs=1
+{% endif %}
+
+# TX queue parameters (EDCF / bursting)
+# tx_queue_<queue name>_<param>
+# queues: data0, data1, data2, data3
+#		(data0 is the highest priority queue)
+# parameters:
+#   aifs: AIFS (default 2)
+#   cwmin: cwMin (1, 3, 7, 15, 31, 63, 127, 255, 511, 1023, 2047, 4095, 8191,
+#	   16383, 32767)
+#   cwmax: cwMax (same values as cwMin, cwMax >= cwMin)
+#   burst: maximum length (in milliseconds with precision of up to 0.1 ms) for
+#          bursting
+#
+# Default WMM parameters (IEEE 802.11 draft; 11-03-0504-03-000e):
+# These parameters are used by the access point when transmitting frames
+# to the clients.
+#
+# Low priority / AC_BK = background
+tx_queue_data3_aifs=7
+tx_queue_data3_cwmin=15
+tx_queue_data3_cwmax=1023
+tx_queue_data3_burst=0
+# Note: for IEEE 802.11b mode: cWmin=31 cWmax=1023 burst=0
+#
+# Normal priority / AC_BE = best effort
+tx_queue_data2_aifs=3
+tx_queue_data2_cwmin=15
+tx_queue_data2_cwmax=63
+tx_queue_data2_burst=0
+# Note: for IEEE 802.11b mode: cWmin=31 cWmax=127 burst=0
+#
+# High priority / AC_VI = video
+tx_queue_data1_aifs=1
+tx_queue_data1_cwmin=7
+tx_queue_data1_cwmax=15
+tx_queue_data1_burst=3.0
+# Note: for IEEE 802.11b mode: cWmin=15 cWmax=31 burst=6.0
+#
+# Highest priority / AC_VO = voice
+tx_queue_data0_aifs=1
+tx_queue_data0_cwmin=3
+tx_queue_data0_cwmax=7
+tx_queue_data0_burst=1.5
+
+# Default WMM parameters (IEEE 802.11 draft; 11-03-0504-03-000e):
+# for 802.11a or 802.11g networks
+# These parameters are sent to WMM clients when they associate.
+# The parameters will be used by WMM clients for frames transmitted to the
+# access point.
+#
+# note - txop_limit is in units of 32microseconds
+# note - acm is admission control mandatory flag. 0 = admission control not
+# required, 1 = mandatory
+# note - Here cwMin and cmMax are in exponent form. The actual cw value used
+# will be (2^n)-1 where n is the value given here. The allowed range for these
+# wmm_ac_??_{cwmin,cwmax} is 0..15 with cwmax >= cwmin.
+#
+wmm_enabled=1
+
+# Low priority / AC_BK = background
+wmm_ac_bk_cwmin=4
+wmm_ac_bk_cwmax=10
+wmm_ac_bk_aifs=7
+wmm_ac_bk_txop_limit=0
+wmm_ac_bk_acm=0
+# Note: for IEEE 802.11b mode: cWmin=5 cWmax=10
+#
+# Normal priority / AC_BE = best effort
+wmm_ac_be_aifs=3
+wmm_ac_be_cwmin=4
+wmm_ac_be_cwmax=10
+wmm_ac_be_txop_limit=0
+wmm_ac_be_acm=0
+# Note: for IEEE 802.11b mode: cWmin=5 cWmax=7
+#
+# High priority / AC_VI = video
+wmm_ac_vi_aifs=2
+wmm_ac_vi_cwmin=3
+wmm_ac_vi_cwmax=4
+wmm_ac_vi_txop_limit=94
+wmm_ac_vi_acm=0
+# Note: for IEEE 802.11b mode: cWmin=4 cWmax=5 txop_limit=188
+#
+# Highest priority / AC_VO = voice
+wmm_ac_vo_aifs=2
+wmm_ac_vo_cwmin=2
+wmm_ac_vo_cwmax=3
+wmm_ac_vo_txop_limit=47
+wmm_ac_vo_acm=0
+
+"""
+
+default_config_data = {
+    'address': [],
+    'address_remove': [],
+    'cap_ht_40mhz_incapable' : False,
+    'cap_ht_powersave' : False,
+    'cap_ht_chan_set_width' : '',
+    'cap_ht_delayed_block_ack' : False,
+    'cap_ht_dsss_cck_40' : False,
+    'cap_ht_greenfield' : False,
+    'cap_ht_ldpc' : False,
+    'cap_ht_lsig_protection' : False,
+    'cap_ht_max_amsdu' : '',
+    'cap_ht_short_gi' :  [],
+    'cap_ht_smps' : '',
+    'cap_ht_stbc_rx' : '',
+    'cap_ht_stbc_tx' : False,
+    'cap_req_ht' : False,
+    'cap_req_vht' : False,
+    'cap_vht_antenna_cnt' : '',
+    'cap_vht_antenna_fixed' : False,
+    'cap_vht_beamform' : '',
+    'cap_vht_center_freq_1' : '',
+    'cap_vht_center_freq_2' : '',
+    'cap_vht_chan_set_width' : '',
+    'cap_vht_ldpc' : False,
+    'cap_vht_link_adaptation' : False,
+    'cap_vht_max_mpdu_exp' : '',
+    'cap_vht_max_mpdu' : '',
+    'cap_vht_short_gi' : [],
+    'cap_vht_stbc_rx' : '',
+    'cap_vht_stbc_tx' : False,
+    'cap_vht_tx_powersave' : False,
+    'cap_vht_vht_cf' : False,
+    'channel': '',
+    'country_code': '',
+    'description': '',
+    'deleted': False,
+    'dhcp_client_id': '',
+    'dhcp_hostname': '',
+    'dhcp_vendor_class_id': '',
+    'dhcpv6_prm_only': False,
+    'dhcpv6_temporary': False,
+    'disable': False,
+    'disable_broadcast_ssid' : False,
+    'disable_link_detect' : 1,
+    'expunge_failing_stations' : False,
+    'hw_id' : '',
+    'intf': '',
+    'isolate_stations' : False,
+    'mac' : '',
+    'max_stations' : '',
+    'mgmt_frame_protection' : 'disabled',
+    'mode' : 'g',
+    'phy' : '',
+    'reduce_transmit_power' : '',
+    'sec_wep' : False,
+    'sec_wep_key' : [],
+    'sec_wpa' : False,
+    'sec_wpa_cipher' : [],
+    'sec_wpa_mode' : 'both',
+    'sec_wpa_passphrase' : '',
+    'sec_wpa_radius' : [],
+    'ssid' : '',
+    'type' : 'monitor',
+    'vif': [],
+    'vif_remove': []
+}
+
+def get_config_name(intf):
+    cfg_file = r'/etc/hostapd/{}.cfg'.format(intf)
+    return cfg_file
+
+
+def wifi_mkdir(directory):
+    # create directory on demand
+    if not os.path.exists(directory):
+        os.mkdir(directory)
+
+    # fix permissions - corresponds to mode 755
+    os.chmod(directory, S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
+    uid = getpwnam(user).pw_uid
+    gid = getgrnam(group).gr_gid
+    os.chown(directory, uid, gid)
+
+
+def subprocess_cmd(command):
+    p = Popen(command, stdout=PIPE, shell=True)
+    p.communicate()
+
+
+def apply_vlan_config(vlan, config):
+    """
+    Generic function to apply a VLAN configuration from a dictionary
+    to a VLAN interface
+    """
+
+    if type(vlan) != type(VLANIf("lo")):
+        raise TypeError()
+
+    # update interface description used e.g. within SNMP
+    vlan.set_alias(config['description'])
+    # ignore link state changes
+    vlan.set_link_detect(config['disable_link_detect'])
+    # Maximum Transmission Unit (MTU)
+    vlan.set_mtu(config['mtu'])
+    # Change VLAN interface MAC address
+    if config['mac']:
+        vlan.set_mac(config['mac'])
+
+    # enable/disable VLAN interface
+    if config['disable']:
+        vlan.set_state('down')
+    else:
+        vlan.set_state('up')
+
+    # Configure interface address(es)
+    # - not longer required addresses get removed first
+    # - newly addresses will be added second
+    for addr in config['address_remove']:
+        vlan.del_addr(addr)
+    for addr in config['address']:
+        vlan.add_addr(addr)
+
+
+def get_config():
+    wifi = deepcopy(default_config_data)
+    conf = Config()
+
+    # determine tagNode instance
+    try:
+        wifi['intf'] = os.environ['VYOS_TAGNODE_VALUE']
+    except KeyError as E:
+        print("Interface not specified")
+
+    # check if wireless interface has been removed
+    cfg_base = 'interfaces wireless ' + wifi['intf']
+    if not conf.exists(cfg_base):
+        wifi['deleted'] = True
+        # we can not bail out early as wireless interface can not be removed
+        # Kernel will complain with: RTNETLINK answers: Operation not supported.
+        # Thus we need to remove individual settings
+        return wifi
+
+    # set new configuration level
+    conf.set_level(cfg_base)
+
+    # retrieve configured interface addresses
+    if conf.exists('address'):
+        wifi['address'] = conf.return_values('address')
+
+    # get interface addresses (currently effective) - to determine which
+    # address is no longer valid and needs to be removed
+    eff_addr = conf.return_effective_values('address')
+    wifi['address_remove'] = list_diff(eff_addr, wifi['address'])
+
+    # 40MHz intolerance, use 20MHz only
+    if conf.exists('capabilities ht 40MHz-incapable'):
+        wifi['cap_ht_40mhz_incapable'] = True
+
+    # WMM-PS Unscheduled Automatic Power Save Delivery [U-APSD]
+    if conf.exists('capabilities ht auto-powersave'):
+        wifi['cap_ht_powersave'] = True
+
+    # Supported channel set width
+    if conf.exists('capabilities ht channel-set-width'):
+        wifi['cap_ht_chan_set_width'] = conf.return_values('capabilities ht channel-set-width')
+
+    # HT-delayed Block Ack
+    if conf.exists('capabilities ht delayed-block-ack'):
+        wifi['cap_ht_delayed_block_ack'] = True
+
+    # DSSS/CCK Mode in 40 MHz
+    if conf.exists('capabilities ht dsss-cck-40'):
+        wifi['cap_ht_dsss_cck_40'] = True
+
+    # HT-greenfield capability
+    if conf.exists('capabilities ht greenfield'):
+        wifi['cap_ht_greenfield'] = True
+
+    # LDPC coding capability
+    if conf.exists('capabilities ht ldpc'):
+        wifi['cap_ht_ldpc'] = True
+
+    # L-SIG TXOP protection capability
+    if conf.exists('capabilities ht lsig-protection'):
+        wifi['cap_ht_lsig_protection'] = True
+
+    # Set Maximum A-MSDU length
+    if conf.exists('capabilities ht max-amsdu'):
+        wifi['cap_ht_max_amsdu'] = conf.return_value('capabilities ht max-amsdu')
+
+    # Short GI capabilities
+    if conf.exists('capabilities ht short-gi'):
+        wifi['cap_ht_short_gi'] = conf.return_values('capabilities ht short-gi')
+
+    # Spatial Multiplexing Power Save (SMPS) settings
+    if conf.exists('capabilities ht smps'):
+        wifi['cap_ht_smps'] = conf.return_value('capabilities ht smps')
+
+    # Support for receiving PPDU using STBC (Space Time Block Coding)
+    if conf.exists('capabilities ht stbc rx'):
+        wifi['cap_ht_stbc_rx'] = conf.return_value('capabilities ht stbc rx')
+
+    # Support for sending PPDU using STBC (Space Time Block Coding)
+    if conf.exists('capabilities ht stbc tx'):
+        wifi['cap_ht_stbc_tx'] = True
+
+    # Require stations to support HT PHY (reject association if they do not)
+    if conf.exists('capabilities require-ht'):
+        wifi['cap_req_ht'] = True
+
+    # Require stations to support VHT PHY (reject association if they do not)
+    if conf.exists('capabilities require-vht'):
+        wifi['cap_req_vht'] = True
+
+    # Number of antennas on this card
+    if conf.exists('capabilities vht antenna-count'):
+        wifi['cap_vht_antenna_cnt'] = conf.return_value('capabilities vht antenna-count')
+
+    # set if antenna pattern does not change during the lifetime of an association
+    if conf.exists('capabilities vht antenna-pattern-fixed'):
+        wifi['cap_vht_antenna_fixed'] = True
+
+    # Beamforming capabilities
+    if conf.exists('capabilities vht beamform'):
+        wifi['cap_vht_beamform'] = conf.return_values('capabilities vht beamform')
+
+    # VHT operating channel center frequency - center freq 1 (for use with 80, 80+80 and 160 modes)
+    if conf.exists('capabilities vht center-channel-freq freq-1'):
+        wifi['cap_vht_center_freq_1'] = conf.return_value('capabilities vht center-channel-freq freq-1')
+
+    # VHT operating channel center frequency - center freq 2 (for use with the 80+80 mode)
+    if conf.exists('capabilities vht center-channel-freq freq-2'):
+        wifi['cap_vht_center_freq_2'] = conf.return_value('capabilities vht center-channel-freq freq-2')
+
+    # VHT operating Channel width
+    if conf.exists('capabilities vht channel-set-width'):
+        wifi['cap_vht_chan_set_width'] = conf.return_value('capabilities vht channel-set-width')
+
+    # LDPC coding capability
+    if conf.exists('capabilities vht ldpc'):
+        wifi['cap_vht_ldpc'] = True
+
+    # VHT link adaptation capabilities
+    if conf.exists('capabilities vht link-adaptation'):
+        wifi['cap_vht_link_adaptation'] = True
+
+    # Set the maximum length of A-MPDU pre-EOF padding that the station can receive
+    if conf.exists('capabilities vht max-mpdu-exp'):
+        wifi['cap_vht_max_mpdu_exp'] = conf.return_value('capabilities vht max-mpdu-exp')
+
+    # Increase Maximum MPDU length
+    if conf.exists('capabilities vht max-mpdu'):
+        wifi['cap_vht_max_mpdu'] = conf.return_value('capabilities vht max-mpdu')
+
+    # Increase Maximum MPDU length
+    if conf.exists('capabilities vht short-gi'):
+        wifi['cap_vht_short_gi'] = conf.return_values('capabilities vht short-gi')
+
+    # Support for receiving PPDU using STBC (Space Time Block Coding)
+    if conf.exists('capabilities vht stbc rx'):
+        wifi['cap_vht_stbc_rx'] = conf.return_value('capabilities vht stbc rx')
+
+    # Support for the transmission of at least 2x1 STBC (Space Time Block Coding)
+    if conf.exists('capabilities vht stbc tx'):
+        wifi['cap_vht_stbc_tx'] = True
+
+    # Support for VHT TXOP Power Save Mode
+    if conf.exists('capabilities vht tx-powersave'):
+        wifi['cap_vht_tx_powersave'] = True
+
+    # STA supports receiving a VHT variant HT Control field
+    if conf.exists('capabilities vht vht-cf'):
+        wifi['cap_vht_vht_cf'] = True
+
+    # Wireless radio channel
+    if conf.exists('channel'):
+        wifi['channel'] = conf.return_value('channel')
+
+    # retrieve interface description
+    if conf.exists('description'):
+        wifi['description'] = conf.return_value('description')
+
+    # get DHCP client identifier
+    if conf.exists('dhcp-options client-id'):
+        wifi['dhcp_client_id'] = conf.return_value('dhcp-options client-id')
+
+    # DHCP client host name (overrides the system host name)
+    if conf.exists('dhcp-options host-name'):
+        wifi['dhcp_hostname'] = conf.return_value('dhcp-options host-name')
+
+    # DHCP client vendor identifier
+    if conf.exists('dhcp-options vendor-class-id'):
+        wifi['dhcp_vendor_class_id'] = conf.return_value('dhcp-options vendor-class-id')
+
+    # DHCPv6 only acquire config parameters, no address
+    if conf.exists('dhcpv6-options parameters-only'):
+        wifi['dhcpv6_prm_only'] = conf.return_value('dhcpv6-options parameters-only')
+
+    # DHCPv6 temporary IPv6 address
+    if conf.exists('dhcpv6-options temporary'):
+        wifi['dhcpv6_temporary'] = conf.return_value('dhcpv6-options temporary')
+
+    # Disable broadcast of SSID from access-point
+    if conf.exists('disable-broadcast-ssid'):
+        wifi['disable_broadcast_ssid'] = True
+
+    # ignore link state changes on this interface
+    if conf.exists('disable-link-detect'):
+        wifi['disable_link_detect'] = 2
+
+    # Disassociate stations based on excessive transmission failures
+    if conf.exists('expunge-failing-stations'):
+        wifi['expunge_failing_stations'] = True
+
+    # retrieve real hardware address
+    if conf.exists('hw-id'):
+        wifi['hw_id'] = conf.return_value('hw-id')
+
+    # Isolate stations on the AP so they cannot see each other
+    if conf.exists('isolate-stations'):
+        wifi['isolate_stations'] = True
+
+    # Media Access Control (MAC) address
+    if conf.exists('mac'):
+        wifi['mac'] = conf.return_value('mac')
+
+    # Maximum number of wireless radio stations
+    if conf.exists('max-stations'):
+        wifi['max_stations'] = conf.return_value('max-stations')
+
+    # Management Frame Protection (MFP) according to IEEE 802.11w
+    if conf.exists('mgmt-frame-protection'):
+        wifi['mgmt_frame_protection'] = conf.return_value('mgmt-frame-protection')
+
+    # Wireless radio mode
+    if conf.exists('mode'):
+        wifi['mode'] = conf.return_value('mode')
+
+    # Wireless physical device
+    if conf.exists('phy'):
+        wifi['phy'] = conf.return_value('phy')
+
+    # Transmission power reduction in dBm
+    if conf.exists('reduce-transmit-power'):
+        wifi['reduce_transmit_power'] = conf.return_value('reduce-transmit-power')
+
+    # WEP enabled?
+    if conf.exists('security wep'):
+        wifi['sec_wep'] = True
+
+    # WEP encryption key(s)
+    if conf.exists('security wep key'):
+        wifi['sec_wep_key'] = conf.return_values('security wep key')
+
+    # WPA enabled?
+    if conf.exists('security wpa'):
+        wifi['sec_wpa'] = True
+
+    # WPA Cipher suite
+    if conf.exists('security wpa cipher'):
+        wifi['sec_wpa_cipher'] = conf.return_values('security wpa cipher')
+
+    # WPA mode
+    if conf.exists('security wpa mode'):
+        wifi['sec_wpa_mode'] = conf.return_value('security wpa mode')
+
+    # WPA default ciphers depend on WPA mode
+    if not wifi['sec_wpa_cipher']:
+        if wifi['sec_wpa_mode'] == 'wpa':
+            wifi['sec_wpa_cipher'].append('TKIP')
+            wifi['sec_wpa_cipher'].append('CCMP')
+
+        elif wifi['sec_wpa_mode'] == 'wpa2':
+            wifi['sec_wpa_cipher'].append('CCMP')
+
+        elif wifi['sec_wpa_mode'] == 'both':
+            wifi['sec_wpa_cipher'].append('CCMP')
+            wifi['sec_wpa_cipher'].append('TKIP')
+
+    # WPA personal shared pass phrase
+    if conf.exists('security wpa passphrase'):
+        wifi['sec_wpa_passphrase'] = conf.return_value('security wpa passphrase')
+
+    # WPA radius server goes here
+    for server in conf.list_nodes('security wpa radius-server'):
+        # set new configuration level
+        conf.set_level(cfg_base + ' security wpa radius-server ' + server)
+
+        radius = {
+            'server' : server,
+            'acc_port' : '',
+            'port' : 1812,
+            'secret' : ''
+        }
+
+        # receive RADIUS accounting info
+        if conf.exists('accounting'):
+            radius['acc_port'] = conf.return_value('accounting')
+
+        # RADIUS server port
+        if conf.exists('port'):
+            radius['port'] = conf.return_value('port')
+
+        # RADIUS server shared-secret
+        if conf.exists('secret'):
+            radius['secret'] = conf.return_value('secret')
+
+        # append RADIUS server to list of servers
+        wifi['sec_wpa_radius'].append(radius)
+
+    # re-set configuration level to parse new nodes
+    conf.set_level(cfg_base)
+
+    # Wireless access-point service set identifier (SSID)
+    if conf.exists('ssid'):
+        wifi['ssid'] = conf.return_value('ssid')
+
+    # Wireless device type for this interface
+    if conf.exists('type'):
+        wifi['type'] = conf.return_value('type')
+
+    # re-set configuration level to parse new nodes
+    conf.set_level(cfg_base)
+    # Determine vif interfaces (currently effective) - to determine which
+    # vif interface is no longer present and needs to be removed
+    eff_intf = conf.list_effective_nodes('vif')
+    act_intf = conf.list_nodes('vif')
+    wifi['vif_remove'] = list_diff(eff_intf, act_intf)
+
+    if conf.exists('vif'):
+        for vif in conf.list_nodes('vif'):
+            # set config level to vif interface
+            conf.set_level(cfg_base + ' vif ' + vif)
+            wifi['vif'].append(vlan_to_dict(conf))
+
+
+    # retrieve configured regulatory domain
+    conf.set_level('system')
+    if conf.exists('wifi-regulatory-domain'):
+        wifi['country_code'] = conf.return_value('wifi-regulatory-domain')
+
+    return wifi
+
+
+def verify(wifi):
+    if wifi['deleted']:
+        return None
+
+    if wifi['type'] != 'monitor' and not wifi['ssid']:
+        raise ConfigError('SSID must be set for {}'.format(wifi['intf']))
+
+    if wifi['type'] == 'access-point' and not wifi['channel']:
+        raise ConfigError('Channel must be set for {}'.format(wifi['intf']))
+
+    if len(wifi['sec_wep_key']) > 4:
+        raise ConfigError('No more then 4 WEP keys configurable')
+
+    if wifi['cap_vht'] and not wifi['cap_ht']:
+        raise ConfigError('Specify HT flags if you want to use VHT!')
+
+    if wifi['cap_vht_beamform'] and wifi['cap_vht_antenna_cnt'] == 1:
+        raise ConfigError('Cannot use beam forming with just one antenna!')
+
+    if wifi['sec_wep'] and (len(wifi['sec_wep_key']) == 0):
+        raise ConfigError('Missing WEP keys')
+
+    if wifi['sec_wpa'] and not (wifi['sec_wpa_passphrase'] or wifi['sec_wpa_radius']):
+        raise ConfigError('Misssing WPA key or RADIUS server')
+
+    conf = Config()
+    if not conf.exists('system wifi-regulatory-domain'):
+        raise ConfigError('Wireless regulatory domain is mandatory.\n' \
+                          'Use "set system wifi-regulatory-domain" to set.')
+
+    return None
+
+def generate(wifi):
+    if wifi['deleted']:
+        if os.path.isfile(get_config_name(wifi['intf'])):
+            os.unlink(get_config_name(wifi['intf']))
+
+        return None
+
+    # create config directory on demand
+    directory = os.path.dirname(get_config_name(wifi['intf']))
+    wifi_mkdir(directory)
+
+    tmpl = Template(config_hostapd_tmpl)
+    config_text = tmpl.render(wifi)
+    with open(get_config_name(wifi['intf']), 'w') as f:
+        f.write(config_text)
+
+    return None
+
+def apply(wifi):
+    pid = 0
+    pidfile = '/var/run/hostapd/{}.pid'.format(wifi['intf'])
+    if os.path.isfile(pidfile):
+        pid = 0
+        with open(pidfile, 'r') as f:
+            pid = int(f.read())
+
+    # always stop hostapd service first before reconfiguring it
+    if pid_exists(pid):
+        cmd  = 'start-stop-daemon --stop --quiet'
+        cmd += ' --pidfile ' + pidfile
+        subprocess_cmd(cmd)
+
+    w = EthernetIf(wifi['intf'])
+    if wifi['deleted']:
+        # delete interface
+        w.remove()
+    else:
+        # Some parts e.g. MAC address can't be changed when interface is up
+        w.set_state('down')
+
+        # update interface description used e.g. within SNMP
+        w.set_alias(wifi['description'])
+
+        # get DHCP config dictionary and update values
+        opt = w.get_dhcp_options()
+
+        if wifi['dhcp_client_id']:
+            opt['client_id'] = wifi['dhcp_client_id']
+
+        if wifi['dhcp_hostname']:
+            opt['hostname'] = wifi['dhcp_hostname']
+
+        if wifi['dhcp_vendor_class_id']:
+            opt['vendor_class_id'] = wifi['dhcp_vendor_class_id']
+
+        # store DHCP config dictionary - used later on when addresses are aquired
+        w.set_dhcp_options(opt)
+
+        # get DHCPv6 config dictionary and update values
+        opt = w.get_dhcpv6_options()
+
+        if wifi['dhcpv6_prm_only']:
+            opt['dhcpv6_prm_only'] = True
+
+        if wifi['dhcpv6_temporary']:
+            opt['dhcpv6_temporary'] = True
+
+        # store DHCPv6 config dictionary - used later on when addresses are aquired
+        w.set_dhcpv6_options(opt)
+
+        # ignore link state changes
+        w.set_link_detect(wifi['disable_link_detect'])
+
+        # Change interface MAC address - re-set to real hardware address (hw-id)
+        # if custom mac is removed
+        if wifi['mac']:
+            w.set_mac(wifi['mac'])
+        else:
+            w.set_mac(wifi['hw_id'])
+
+        # enable interface
+        if not wifi['disable']:
+            w.set_state('up')
+
+        # Configure interface address(es)
+        # - not longer required addresses get removed first
+        # - newly addresses will be added second
+        for addr in wifi['address_remove']:
+            w.del_addr(addr)
+        for addr in wifi['address']:
+            w.add_addr(addr)
+
+        # remove no longer required VLAN interfaces (vif)
+        for vif in wifi['vif_remove']:
+            e.del_vlan(vif)
+
+        # create VLAN interfaces (vif)
+        for vif in wifi['vif']:
+            # QoS priority mapping can only be set during interface creation
+            # so we delete the interface first if required.
+            if vif['egress_qos_changed'] or vif['ingress_qos_changed']:
+                try:
+                    # on system bootup the above condition is true but the interface
+                    # does not exists, which throws an exception, but that's legal
+                    e.del_vlan(vif['id'])
+                except:
+                    pass
+
+            vlan = e.add_vlan(vif['id'])
+            apply_vlan_config(vlan, vif)
+
+    # Physical interface is now configured. Proceed by starting hostapd
+    cmd  = 'start-stop-daemon --start --quiet'
+    cmd += ' --pidfile ' + pidfile
+    cmd += ' --exec /usr/sbin/hostapd'
+    # now pass arguments to hostapd binary
+    cmd += ' --'
+    cmd += ' -P ' + pidfile
+    cmd += ' -B ' + get_config_name(wifi['intf'])
+
+    # execute assembled command
+    subprocess_cmd(cmd)
+
+    return None
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)