Merge pull request #3223 from stangri/master-luci-app-vpnbypass

[project/luci.git] / modules / luci-base / htdocs / luci-static / resources / network.js

'use strict';
'require uci';
'require rpc';
'require validation';

var proto_errors = {
        CONNECT_FAILED:                 _('Connection attempt failed'),
        INVALID_ADDRESS:                _('IP address in invalid'),
        INVALID_GATEWAY:                _('Gateway address is invalid'),
        INVALID_LOCAL_ADDRESS:  _('Local IP address is invalid'),
        MISSING_ADDRESS:                _('IP address is missing'),
        MISSING_PEER_ADDRESS:   _('Peer address is missing'),
        NO_DEVICE:                              _('Network device is not present'),
        NO_IFACE:                               _('Unable to determine device name'),
        NO_IFNAME:                              _('Unable to determine device name'),
        NO_WAN_ADDRESS:                 _('Unable to determine external IP address'),
        NO_WAN_LINK:                    _('Unable to determine upstream interface'),
        PEER_RESOLVE_FAIL:              _('Unable to resolve peer host name'),
        PIN_FAILED:                             _('PIN code rejected')
};

var iface_patterns_ignore = [
        /^wmaster\d+/,
        /^wifi\d+/,
        /^hwsim\d+/,
        /^imq\d+/,
        /^ifb\d+/,
        /^mon\.wlan\d+/,
        /^sit\d+/,
        /^gre\d+/,
        /^gretap\d+/,
        /^ip6gre\d+/,
        /^ip6tnl\d+/,
        /^tunl\d+/,
        /^lo$/
];

var iface_patterns_wireless = [
        /^wlan\d+/,
        /^wl\d+/,
        /^ath\d+/,
        /^\w+\.network\d+/
];

var iface_patterns_virtual = [ ];

var callLuciNetworkDevices = rpc.declare({
        object: 'luci',
        method: 'getNetworkDevices',
        expect: { '': {} }
});

var callLuciWirelessDevices = rpc.declare({
        object: 'luci',
        method: 'getWirelessDevices',
        expect: { '': {} }
});

var callLuciIfaddrs = rpc.declare({
        object: 'luci',
        method: 'getIfaddrs',
        expect: { result: [] }
});

var callLuciBoardJSON = rpc.declare({
        object: 'luci',
        method: 'getBoardJSON'
});

var callLuciHostHints = rpc.declare({
        object: 'luci',
        method: 'getHostHints',
        expect: { '': {} }
});

var callIwinfoAssoclist = rpc.declare({
        object: 'iwinfo',
        method: 'assoclist',
        params: [ 'device', 'mac' ],
        expect: { results: [] }
});

var callIwinfoScan = rpc.declare({
        object: 'iwinfo',
        method: 'scan',
        params: [ 'device' ],
        nobatch: true,
        expect: { results: [] }
});

var callNetworkInterfaceDump = rpc.declare({
        object: 'network.interface',
        method: 'dump',
        expect: { 'interface': [] }
});

var callNetworkDeviceStatus = rpc.declare({
        object: 'network.device',
        method: 'status',
        expect: { '': {} }
});

var callNetworkProtoHandlers = rpc.declare({
        object: 'network',
        method: 'get_proto_handlers',
        expect: { '': {} }
});

var _init = null,
    _state = null,
    _protocols = {},
    _protospecs = {};

function getProtocolHandlers(cache) {
        return callNetworkProtoHandlers().then(function(protos) {
                /* Register "none" protocol */
                if (!protos.hasOwnProperty('none'))
                        Object.assign(protos, { none: { no_device: false } });

                /* Hack: emulate relayd protocol */
                if (!protos.hasOwnProperty('relay'))
                        Object.assign(protos, { relay: { no_device: true } });

                Object.assign(_protospecs, protos);

                return Promise.all(Object.keys(protos).map(function(p) {
                        return Promise.resolve(L.require('protocol.%s'.format(p))).catch(function(err) {
                                if (L.isObject(err) && err.name != 'NetworkError')
                                        L.error(err);
                        });
                })).then(function() {
                        return protos;
                });
        }).catch(function() {
                return {};
        });
}

function getWifiStateBySid(sid) {
        var s = uci.get('wireless', sid);

        if (s != null && s['.type'] == 'wifi-iface') {
                for (var radioname in _state.radios) {
                        for (var i = 0; i < _state.radios[radioname].interfaces.length; i++) {
                                var netstate = _state.radios[radioname].interfaces[i];

                                if (typeof(netstate.section) != 'string')
                                        continue;

                                var s2 = uci.get('wireless', netstate.section);

                                if (s2 != null && s['.type'] == s2['.type'] && s['.name'] == s2['.name']) {
                                        if (s2['.anonymous'] == false && netstate.section.charAt(0) == '@')
                                                return null;

                                        return [ radioname, _state.radios[radioname], netstate ];
                                }
                        }
                }
        }

        return null;
}

function getWifiStateByIfname(ifname) {
        for (var radioname in _state.radios) {
                for (var i = 0; i < _state.radios[radioname].interfaces.length; i++) {
                        var netstate = _state.radios[radioname].interfaces[i];

                        if (typeof(netstate.ifname) != 'string')
                                continue;

                        if (netstate.ifname == ifname)
                                return [ radioname, _state.radios[radioname], netstate ];
                }
        }

        return null;
}

function isWifiIfname(ifname) {
        for (var i = 0; i < iface_patterns_wireless.length; i++)
                if (iface_patterns_wireless[i].test(ifname))
                        return true;

        return false;
}

function getWifiSidByNetid(netid) {
        var m = /^(\w+)\.network(\d+)$/.exec(netid);
        if (m) {
                var sections = uci.sections('wireless', 'wifi-iface');
                for (var i = 0, n = 0; i < sections.length; i++) {
                        if (sections[i].device != m[1])
                                continue;

                        if (++n == +m[2])
                                return sections[i]['.name'];
                }
        }

        return null;
}

function getWifiSidByIfname(ifname) {
        var sid = getWifiSidByNetid(ifname);

        if (sid != null)
                return sid;

        var res = getWifiStateByIfname(ifname);

        if (res != null && L.isObject(res[2]) && typeof(res[2].section) == 'string')
                return res[2].section;

        return null;
}

function getWifiNetidBySid(sid) {
        var s = uci.get('wireless', sid);
        if (s != null && s['.type'] == 'wifi-iface') {
                var radioname = s.device;
                if (typeof(s.device) == 'string') {
                        var i = 0, netid = null, sections = uci.sections('wireless', 'wifi-iface');
                        for (var i = 0, n = 0; i < sections.length; i++) {
                                if (sections[i].device != s.device)
                                        continue;

                                n++;

                                if (sections[i]['.name'] != s['.name'])
                                        continue;

                                return [ '%s.network%d'.format(s.device, n), s.device ];
                        }

                }
        }

        return null;
}

function getWifiNetidByNetname(name) {
        var sections = uci.sections('wireless', 'wifi-iface');
        for (var i = 0; i < sections.length; i++) {
                if (typeof(sections[i].network) != 'string')
                        continue;

                var nets = sections[i].network.split(/\s+/);
                for (var j = 0; j < nets.length; j++) {
                        if (nets[j] != name)
                                continue;

                        return getWifiNetidBySid(sections[i]['.name']);
                }
        }

        return null;
}

function isVirtualIfname(ifname) {
        for (var i = 0; i < iface_patterns_virtual.length; i++)
                if (iface_patterns_virtual[i].test(ifname))
                        return true;

        return false;
}

function isIgnoredIfname(ifname) {
        for (var i = 0; i < iface_patterns_ignore.length; i++)
                if (iface_patterns_ignore[i].test(ifname))
                        return true;

        return false;
}

function appendValue(config, section, option, value) {
        var values = uci.get(config, section, option),
            isArray = Array.isArray(values),
            rv = false;

        if (isArray == false)
                values = L.toArray(values);

        if (values.indexOf(value) == -1) {
                values.push(value);
                rv = true;
        }

        uci.set(config, section, option, isArray ? values : values.join(' '));

        return rv;
}

function removeValue(config, section, option, value) {
        var values = uci.get(config, section, option),
            isArray = Array.isArray(values),
            rv = false;

        if (isArray == false)
                values = L.toArray(values);

        for (var i = values.length - 1; i >= 0; i--) {
                if (values[i] == value) {
                        values.splice(i, 1);
                        rv = true;
                }
        }

        if (values.length > 0)
                uci.set(config, section, option, isArray ? values : values.join(' '));
        else
                uci.unset(config, section, option);

        return rv;
}

function prefixToMask(bits, v6) {
        var w = v6 ? 128 : 32,
            m = [];

        if (bits > w)
                return null;

        for (var i = 0; i < w / 16; i++) {
                var b = Math.min(16, bits);
                m.push((0xffff << (16 - b)) & 0xffff);
                bits -= b;
        }

        if (v6)
                return String.prototype.format.apply('%x:%x:%x:%x:%x:%x:%x:%x', m).replace(/:0(?::0)+$/, '::');
        else
                return '%d.%d.%d.%d'.format(m[0] >>> 8, m[0] & 0xff, m[1] >>> 8, m[1] & 0xff);
}

function maskToPrefix(mask, v6) {
        var m = v6 ? validation.parseIPv6(mask) : validation.parseIPv4(mask);

        if (!m)
                return null;

        var bits = 0;

        for (var i = 0, z = false; i < m.length; i++) {
                z = z || !m[i];

                while (!z && (m[i] & (v6 ? 0x8000 : 0x80))) {
                        m[i] = (m[i] << 1) & (v6 ? 0xffff : 0xff);
                        bits++;
                }

                if (m[i])
                        return null;
        }

        return bits;
}

function initNetworkState(refresh) {
        if (_state == null || refresh) {
                _init = _init || Promise.all([
                        L.resolveDefault(callNetworkInterfaceDump(), []),
                        L.resolveDefault(callNetworkDeviceStatus(), {}),
                        L.resolveDefault(callLuciBoardJSON(), {}),
                        L.resolveDefault(callLuciIfaddrs(), []),
                        L.resolveDefault(callLuciNetworkDevices(), {}),
                        L.resolveDefault(callLuciWirelessDevices(), {}),
                        L.resolveDefault(callLuciHostHints(), {}),
                        getProtocolHandlers(),
                        uci.load(['network', 'wireless', 'luci'])
                ]).then(function(data) {
                        var netifd_ifaces = data[0],
                            netifd_devs   = data[1],
                            board_json    = data[2],
                            luci_ifaddrs  = data[3],
                            luci_devs     = data[4];

                        var s = {
                                isTunnel: {}, isBridge: {}, isSwitch: {}, isWifi: {},
                                ifaces: netifd_ifaces, radios: data[5], hosts: data[6],
                                netdevs: {}, bridges: {}, switches: {}
                        };

                        for (var i = 0, a; (a = luci_ifaddrs[i]) != null; i++) {
                                var name = a.name.replace(/:.+$/, '');

                                if (isVirtualIfname(name))
                                        s.isTunnel[name] = true;

                                if (s.isTunnel[name] || !(isIgnoredIfname(name) || isVirtualIfname(name))) {
                                        s.netdevs[name] = s.netdevs[name] || {
                                                idx:      a.ifindex || i,
                                                name:     name,
                                                rawname:  a.name,
                                                flags:    [],
                                                ipaddrs:  [],
                                                ip6addrs: []
                                        };

                                        if (a.family == 'packet') {
                                                s.netdevs[name].flags   = a.flags;
                                                s.netdevs[name].stats   = a.data;

                                                if (a.addr != null && a.addr != '00:00:00:00:00:00' && a.addr.length == 17)
                                                        s.netdevs[name].macaddr = a.addr;
                                        }
                                        else if (a.family == 'inet') {
                                                s.netdevs[name].ipaddrs.push(a.addr + '/' + a.netmask);
                                        }
                                        else if (a.family == 'inet6') {
                                                s.netdevs[name].ip6addrs.push(a.addr + '/' + a.netmask);
                                        }
                                }
                        }

                        /* override getifaddr() stats with netifd device status stats as
                           the former are limited to 32bit counters only */
                        for (var devname in netifd_devs) {
                                if (!s.netdevs.hasOwnProperty(devname))
                                        continue;

                                if (!L.isObject(netifd_devs[devname]))
                                        continue;

                                s.netdevs[devname].stats = Object.assign({},
                                        s.netdevs[devname].stats, netifd_devs[devname].statistics);
                        }

                        for (var devname in luci_devs) {
                                var dev = luci_devs[devname];

                                if (dev.bridge) {
                                        var b = {
                                                name:    devname,
                                                id:      dev.id,
                                                stp:     dev.stp,
                                                ifnames: []
                                        };

                                        for (var i = 0; dev.ports && i < dev.ports.length; i++) {
                                                var subdev = s.netdevs[dev.ports[i]];

                                                if (subdev == null)
                                                        continue;

                                                b.ifnames.push(subdev);
                                                subdev.bridge = b;
                                        }

                                        s.bridges[devname] = b;
                                        s.isBridge[devname] = true;
                                }

                                if (s.netdevs.hasOwnProperty(devname)) {
                                        Object.assign(s.netdevs[devname], {
                                                macaddr: dev.mac,
                                                type:    dev.type,
                                                mtu:     dev.mtu,
                                                qlen:    dev.qlen
                                        });
                                }
                        }

                        if (L.isObject(board_json.switch)) {
                                for (var switchname in board_json.switch) {
                                        var layout = board_json.switch[switchname],
                                            netdevs = {},
                                            nports = {},
                                            ports = [],
                                            pnum = null,
                                            role = null;

                                        if (L.isObject(layout) && Array.isArray(layout.ports)) {
                                                for (var i = 0, port; (port = layout.ports[i]) != null; i++) {
                                                        if (typeof(port) == 'object' && typeof(port.num) == 'number' &&
                                                                (typeof(port.role) == 'string' || typeof(port.device) == 'string')) {
                                                                var spec = {
                                                                        num:   port.num,
                                                                        role:  port.role || 'cpu',
                                                                        index: (port.index != null) ? port.index : port.num
                                                                };

                                                                if (port.device != null) {
                                                                        spec.device = port.device;
                                                                        spec.tagged = spec.need_tag;
                                                                        netdevs[port.num] = port.device;
                                                                }

                                                                ports.push(spec);

                                                                if (port.role != null)
                                                                        nports[port.role] = (nports[port.role] || 0) + 1;
                                                        }
                                                }

                                                ports.sort(function(a, b) {
                                                        if (a.role != b.role)
                                                                return (a.role < b.role) ? -1 : 1;

                                                        return (a.index - b.index);
                                                });

                                                for (var i = 0, port; (port = ports[i]) != null; i++) {
                                                        if (port.role != role) {
                                                                role = port.role;
                                                                pnum = 1;
                                                        }

                                                        if (role == 'cpu')
                                                                port.label = 'CPU (%s)'.format(port.device);
                                                        else if (nports[role] > 1)
                                                                port.label = '%s %d'.format(role.toUpperCase(), pnum++);
                                                        else
                                                                port.label = role.toUpperCase();

                                                        delete port.role;
                                                        delete port.index;
                                                }

                                                s.switches[switchname] = {
                                                        ports: ports,
                                                        netdevs: netdevs
                                                };
                                        }
                                }
                        }

                        if (L.isObject(board_json.dsl) && L.isObject(board_json.dsl.modem)) {
                                s.hasDSLModem = board_json.dsl.modem;
                        }

                        _init = null;

                        return (_state = s);
                });
        }

        return (_state != null ? Promise.resolve(_state) : _init);
}

function ifnameOf(obj) {
        if (obj instanceof Protocol)
                return obj.getIfname();
        else if (obj instanceof Device)
                return obj.getName();
        else if (obj instanceof WifiDevice)
                return obj.getName();
        else if (obj instanceof WifiNetwork)
                return obj.getIfname();
        else if (typeof(obj) == 'string')
                return obj.replace(/:.+$/, '');

        return null;
}

function networkSort(a, b) {
        return a.getName() > b.getName();
}

function deviceSort(a, b) {
        var typeWeigth = { wifi: 2, alias: 3 },
        weightA = typeWeigth[a.getType()] || 1,
        weightB = typeWeigth[b.getType()] || 1;

    if (weightA != weightB)
        return weightA - weightB;

        return a.getName() > b.getName();
}

function formatWifiEncryption(enc) {
        if (!L.isObject(enc))
                return null;

        if (!enc.enabled)
                return 'None';

        var ciphers = Array.isArray(enc.ciphers)
                ? enc.ciphers.map(function(c) { return c.toUpperCase() }) : [ 'NONE' ];

        if (Array.isArray(enc.wep)) {
                var has_open = false,
                    has_shared = false;

                for (var i = 0; i < enc.wep.length; i++)
                        if (enc.wep[i] == 'open')
                                has_open = true;
                        else if (enc.wep[i] == 'shared')
                                has_shared = true;

                if (has_open && has_shared)
                        return 'WEP Open/Shared (%s)'.format(ciphers.join(', '));
                else if (has_open)
                        return 'WEP Open System (%s)'.format(ciphers.join(', '));
                else if (has_shared)
                        return 'WEP Shared Auth (%s)'.format(ciphers.join(', '));

                return 'WEP';
        }

        if (Array.isArray(enc.wpa)) {
                var versions = [],
                    suites = Array.isArray(enc.authentication)
                        ? enc.authentication.map(function(a) { return a.toUpperCase() }) : [ 'NONE' ];

                for (var i = 0; i < enc.wpa.length; i++)
                        switch (enc.wpa[i]) {
                        case 1:
                                versions.push('WPA');
                                break;

                        default:
                                versions.push('WPA%d'.format(enc.wpa[i]));
                                break;
                        }

                if (versions.length > 1)
                        return 'mixed %s %s (%s)'.format(versions.join('/'), suites.join(', '), ciphers.join(', '));

                return '%s %s (%s)'.format(versions[0], suites.join(', '), ciphers.join(', '));
        }

        return 'Unknown';
}

function enumerateNetworks() {
        var uciInterfaces = uci.sections('network', 'interface'),
            networks = {};

        for (var i = 0; i < uciInterfaces.length; i++)
                networks[uciInterfaces[i]['.name']] = this.instantiateNetwork(uciInterfaces[i]['.name']);

        for (var i = 0; i < _state.ifaces.length; i++)
                if (networks[_state.ifaces[i].interface] == null)
                        networks[_state.ifaces[i].interface] =
                                this.instantiateNetwork(_state.ifaces[i].interface, _state.ifaces[i].proto);

        var rv = [];

        for (var network in networks)
                if (networks.hasOwnProperty(network))
                        rv.push(networks[network]);

        rv.sort(networkSort);

        return rv;
}


var Hosts, Network, Protocol, Device, WifiDevice, WifiNetwork;

/**
 * @class
 * @memberof LuCI
 * @hideconstructor
 * @classdesc
 *
 * The `LuCI.Network` class combines data from multiple `ubus` apis to
 * provide an abstraction of the current network configuration state.
 *
 * It provides methods to enumerate interfaces and devices, to query
 * current configuration details and to manipulate settings.
 */
Network = L.Class.extend(/** @lends LuCI.Network.prototype */ {
        /**
         * Converts the given prefix size in bits to a netmask.
         *
         * @method
         *
         * @param {number} bits
         * The prefix size in bits.
         *
         * @param {boolean} [v6=false]
         * Whether to convert the bits value into an IPv4 netmask (`false`) or
         * an IPv6 netmask (`true`).
         *
         * @returns {null|string}
         * Returns a string containing the netmask corresponding to the bit count
         * or `null` when the given amount of bits exceeds the maximum possible
         * value of `32` for IPv4 or `128` for IPv6.
         */
        prefixToMask: prefixToMask,

        /**
         * Converts the given netmask to a prefix size in bits.
         *
         * @method
         *
         * @param {string} netmask
         * The netmask to convert into a bit count.
         *
         * @param {boolean} [v6=false]
         * Whether to parse the given netmask as IPv4 (`false`) or IPv6 (`true`)
         * address.
         *
         * @returns {null|number}
         * Returns the number of prefix bits contained in the netmask or `null`
         * if the given netmask value was invalid.
         */
        maskToPrefix: maskToPrefix,

        /**
         * An encryption entry describes active wireless encryption settings
         * such as the used key management protocols, active ciphers and
         * protocol versions.
         *
         * @typedef {Object<string, boolean|Array<number|string>>} LuCI.Network.WifiEncryption
         * @memberof LuCI.Network
         *
         * @property {boolean} enabled
         * Specifies whether any kind of encryption, such as `WEP` or `WPA` is
         * enabled. If set to `false`, then no encryption is active and the
         * corresponding network is open.
         *
         * @property {string[]} [wep]
         * When the `wep` property exists, the network uses WEP encryption.
         * In this case, the property is set to an array of active WEP modes
         * which might be either `open`, `shared` or both.
         *
         * @property {number[]} [wpa]
         * When the `wpa` property exists, the network uses WPA security.
         * In this case, the property is set to an array containing the WPA
         * protocol versions used, e.g. `[ 1, 2 ]` for WPA/WPA2 mixed mode or
         * `[ 3 ]` for WPA3-SAE.
         *
         * @property {string[]} [authentication]
         * The `authentication` property only applies to WPA encryption and
         * is defined when the `wpa` property is set as well. It points to
         * an array of active authentication suites used by the network, e.g.
         * `[ "psk" ]` for a WPA(2)-PSK network or `[ "psk", "sae" ]` for
         * mixed WPA2-PSK/WPA3-SAE encryption.
         *
         * @property {string[]} [ciphers]
         * If either WEP or WPA encryption is active, then the `ciphers`
         * property will be set to an array describing the active encryption
         * ciphers used by the network, e.g. `[ "tkip", "ccmp" ]` for a
         * WPA/WPA2-PSK mixed network or `[ "wep-40", "wep-104" ]` for an
         * WEP network.
         */

        /**
         * Converts a given {@link LuCI.Network.WifiEncryption encryption entry}
         * into a human readable string such as `mixed WPA/WPA2 PSK (TKIP, CCMP)`
         * or `WPA3 SAE (CCMP)`.
         *
         * @method
         *
         * @param {LuCI.Network.WifiEncryption} encryption
         * The wireless encryption entry to convert.
         *
         * @returns {null|string}
         * Returns the description string for the given encryption entry or
         * `null` if the given entry was invalid.
         */
        formatWifiEncryption: formatWifiEncryption,

        /**
         * Flushes the local network state cache and fetches updated information
         * from the remote `ubus` apis.
         *
         * @returns {Promise<Object>}
         * Returns a promise resolving to the internal network state object.
         */
        flushCache: function() {
                initNetworkState(true);
                return _init;
        },

        /**
         * Instantiates the given {@link LuCI.Network.Protocol Protocol} backend,
         * optionally using the given network name.
         *
         * @param {string} protoname
         * The protocol backend to use, e.g. `static` or `dhcp`.
         *
         * @param {string} [netname=__dummy__]
         * The network name to use for the instantiated protocol. This should be
         * usually set to one of the interfaces described in /etc/config/network
         * but it is allowed to omit it, e.g. to query protocol capabilities
         * without the need for an existing interface.
         *
         * @returns {null|LuCI.Network.Protocol}
         * Returns the instantiated protocol backend class or `null` if the given
         * protocol isn't known.
         */
        getProtocol: function(protoname, netname) {
                var v = _protocols[protoname];
                if (v != null)
                        return new v(netname || '__dummy__');

                return null;
        },

        /**
         * Obtains instances of all known {@link LuCI.Network.Protocol Protocol}
         * backend classes.
         *
         * @returns {Array<LuCI.Network.Protocol>}
         * Returns an array of protocol class instances.
         */
        getProtocols: function() {
                var rv = [];

                for (var protoname in _protocols)
                        rv.push(new _protocols[protoname]('__dummy__'));

                return rv;
        },

        /**
         * Registers a new {@link LuCI.Network.Protocol Protocol} subclass
         * with the given methods and returns the resulting subclass value.
         *
         * This functions internally calls
         * {@link LuCI.Class.extend Class.extend()} on the `Network.Protocol`
         * base class.
         *
         * @param {string} protoname
         * The name of the new protocol to register.
         *
         * @param {Object<string, *>} methods
         * The member methods and values of the new `Protocol` subclass to
         * be passed to {@link LuCI.Class.extend Class.extend()}.
         *
         * @returns {LuCI.Network.Protocol}
         * Returns the new `Protocol` subclass.
         */
        registerProtocol: function(protoname, methods) {
                var spec = L.isObject(_protospecs) ? _protospecs[protoname] : null;
                var proto = Protocol.extend(Object.assign({
                        getI18n: function() {
                                return protoname;
                        },

                        isFloating: function() {
                                return false;
                        },

                        isVirtual: function() {
                                return (L.isObject(spec) && spec.no_device == true);
                        },

                        renderFormOptions: function(section) {

                        }
                }, methods, {
                        __init__: function(name) {
                                this.sid = name;
                        },

                        getProtocol: function() {
                                return protoname;
                        }
                }));

                _protocols[protoname] = proto;

                return proto;
        },

        /**
         * Registers a new regular expression pattern to recognize
         * virtual interfaces.
         *
         * @param {RegExp} pat
         * A `RegExp` instance to match a virtual interface name
         * such as `6in4-wan` or `tun0`.
         */
        registerPatternVirtual: function(pat) {
                iface_patterns_virtual.push(pat);
        },

        /**
         * Registers a new human readable translation string for a `Protocol`
         * error code.
         *
         * @param {string} code
         * The `ubus` protocol error code to register a translation for, e.g.
         * `NO_DEVICE`.
         *
         * @param {string} message
         * The message to use as translation for the given protocol error code.
         *
         * @returns {boolean}
         * Returns `true` if the error code description has been added or `false`
         * if either the arguments were invalid or if there already was a
         * description for the given code.
         */
        registerErrorCode: function(code, message) {
                if (typeof(code) == 'string' &&
                    typeof(message) == 'string' &&
                    !proto_errors.hasOwnProperty(code)) {
                        proto_errors[code] = message;
                        return true;
                }

                return false;
        },

        /**
         * Adds a new network of the given name and update it with the given
         * uci option values.
         *
         * If a network with the given name already exist but is empty, then
         * this function will update its option, otherwise it will do nothing.
         *
         * @param {string} name
         * The name of the network to add. Must be in the format `[a-zA-Z0-9_]+`.
         *
         * @param {Object<string, string|string[]>} [options]
         * An object of uci option values to set on the new network or to
         * update in an existing, empty network.
         *
         * @returns {Promise<null|LuCI.Network.Protocol>}
         * Returns a promise resolving to the `Protocol` subclass instance
         * describing the added network or resolving to `null` if the name
         * was invalid or if a non-empty network of the given name already
         * existed.
         */
        addNetwork: function(name, options) {
                return this.getNetwork(name).then(L.bind(function(existingNetwork) {
                        if (name != null && /^[a-zA-Z0-9_]+$/.test(name) && existingNetwork == null) {
                                var sid = uci.add('network', 'interface', name);

                                if (sid != null) {
                                        if (L.isObject(options))
                                                for (var key in options)
                                                        if (options.hasOwnProperty(key))
                                                                uci.set('network', sid, key, options[key]);

                                        return this.instantiateNetwork(sid);
                                }
                        }
                        else if (existingNetwork != null && existingNetwork.isEmpty()) {
                                if (L.isObject(options))
                                        for (var key in options)
                                                if (options.hasOwnProperty(key))
                                                        existingNetwork.set(key, options[key]);

                                return existingNetwork;
                        }
                }, this));
        },

        /**
         * Get a {@link LuCI.Network.Protocol Protocol} instance describing
         * the network with the given name.
         *
         * @param {string} name
         * The logical interface name of the network get, e.g. `lan` or `wan`.
         *
         * @returns {Promise<null|LuCI.Network.Protocol>}
         * Returns a promise resolving to a
         * {@link LuCI.Network.Protocol Protocol} subclass instance describing
         * the network or `null` if the network did not exist.
         */
        getNetwork: function(name) {
                return initNetworkState().then(L.bind(function() {
                        var section = (name != null) ? uci.get('network', name) : null;

                        if (section != null && section['.type'] == 'interface') {
                                return this.instantiateNetwork(name);
                        }
                        else if (name != null) {
                                for (var i = 0; i < _state.ifaces.length; i++)
                                        if (_state.ifaces[i].interface == name)
                                                return this.instantiateNetwork(name, _state.ifaces[i].proto);
                        }

                        return null;
                }, this));
        },

        /**
         * Gets an array containing all known networks.
         *
         * @returns {Promise<Array<LuCI.Network.Protocol>>}
         * Returns a promise resolving to a name-sorted array of
         * {@link LuCI.Network.Protocol Protocol} subclass instances
         * describing all known networks.
         */
        getNetworks: function() {
                return initNetworkState().then(L.bind(enumerateNetworks, this));
        },

        /**
         * Deletes the given network and its references from the network and
         * firewall configuration.
         *
         * @param {string} name
         * The name of the network to delete.
         *
         * @returns {Promise<boolean>}
         * Returns a promise resolving to either `true` if the network and
         * references to it were successfully deleted from the configuration or
         * `false` if the given network could not be found.
         */
        deleteNetwork: function(name) {
                var requireFirewall = Promise.resolve(L.require('firewall')).catch(function() {});

                return Promise.all([ requireFirewall, initNetworkState() ]).then(function() {
                        var uciInterface = uci.get('network', name);

                        if (uciInterface != null && uciInterface['.type'] == 'interface') {
                                uci.remove('network', name);

                                uci.sections('luci', 'ifstate', function(s) {
                                        if (s.interface == name)
                                                uci.remove('luci', s['.name']);
                                });

                                uci.sections('network', 'alias', function(s) {
                                        if (s.interface == name)
                                                uci.remove('network', s['.name']);
                                });

                                uci.sections('network', 'route', function(s) {
                                        if (s.interface == name)
                                                uci.remove('network', s['.name']);
                                });

                                uci.sections('network', 'route6', function(s) {
                                        if (s.interface == name)
                                                uci.remove('network', s['.name']);
                                });

                                uci.sections('wireless', 'wifi-iface', function(s) {
                                        var networks = L.toArray(s.network).filter(function(network) { return network != name });

                                        if (networks.length > 0)
                                                uci.set('wireless', s['.name'], 'network', networks.join(' '));
                                        else
                                                uci.unset('wireless', s['.name'], 'network');
                                });

                                if (L.firewall)
                                        return L.firewall.deleteNetwork(name).then(function() { return true });

                                return true;
                        }

                        return false;
                });
        },

        /**
         * Rename the given network and its references to a new name.
         *
         * @param {string} oldName
         * The current name of the network.
         *
         * @param {string} newName
         * The name to rename the network to, must be in the format
         * `[a-z-A-Z0-9_]+`.
         *
         * @returns {Promise<boolean>}
         * Returns a promise resolving to either `true` if the network was
         * successfully renamed or `false` if the new name was invalid, if
         * a network with the new name already exists or if the network to
         * rename could not be found.
         */
        renameNetwork: function(oldName, newName) {
                return initNetworkState().then(function() {
                        if (newName == null || !/^[a-zA-Z0-9_]+$/.test(newName) || uci.get('network', newName) != null)
                                return false;

                        var oldNetwork = uci.get('network', oldName);

                        if (oldNetwork == null || oldNetwork['.type'] != 'interface')
                                return false;

                        var sid = uci.add('network', 'interface', newName);

                        for (var key in oldNetwork)
                                if (oldNetwork.hasOwnProperty(key) && key.charAt(0) != '.')
                                        uci.set('network', sid, key, oldNetwork[key]);

                        uci.sections('luci', 'ifstate', function(s) {
                                if (s.interface == oldName)
                                        uci.set('luci', s['.name'], 'interface', newName);
                        });

                        uci.sections('network', 'alias', function(s) {
                                if (s.interface == oldName)
                                        uci.set('network', s['.name'], 'interface', newName);
                        });

                        uci.sections('network', 'route', function(s) {
                                if (s.interface == oldName)
                                        uci.set('network', s['.name'], 'interface', newName);
                        });

                        uci.sections('network', 'route6', function(s) {
                                if (s.interface == oldName)
                                        uci.set('network', s['.name'], 'interface', newName);
                        });

                        uci.sections('wireless', 'wifi-iface', function(s) {
                                var networks = L.toArray(s.network).map(function(network) { return (network == oldName ? newName : network) });

                                if (networks.length > 0)
                                        uci.set('wireless', s['.name'], 'network', networks.join(' '));
                        });

                        uci.remove('network', oldName);

                        return true;
                });
        },

        /**
         * Get a {@link LuCI.Network.Device Device} instance describing the
         * given network device.
         *
         * @param {string} name
         * The name of the network device to get, e.g. `eth0` or `br-lan`.
         *
         * @returns {Promise<null|LuCI.Network.Device>}
         * Returns a promise resolving to the `Device` instance describing
         * the network device or `null` if the given device name could not
         * be found.
         */
        getDevice: function(name) {
                return initNetworkState().then(L.bind(function() {
                        if (name == null)
                                return null;

                        if (_state.netdevs.hasOwnProperty(name) || isWifiIfname(name))
                                return this.instantiateDevice(name);

                        var netid = getWifiNetidBySid(name);
                        if (netid != null)
                                return this.instantiateDevice(netid[0]);

                        return null;
                }, this));
        },

        /**
         * Get a sorted list of all found network devices.
         *
         * @returns {Promise<Array<LuCI.Network.Device>>}
         * Returns a promise resolving to a sorted array of `Device` class
         * instances describing the network devices found on the system.
         */
        getDevices: function() {
                return initNetworkState().then(L.bind(function() {
                        var devices = {};

                        /* find simple devices */
                        var uciInterfaces = uci.sections('network', 'interface');
                        for (var i = 0; i < uciInterfaces.length; i++) {
                                var ifnames = L.toArray(uciInterfaces[i].ifname);

                                for (var j = 0; j < ifnames.length; j++) {
                                        if (ifnames[j].charAt(0) == '@')
                                                continue;

                                        if (isIgnoredIfname(ifnames[j]) || isVirtualIfname(ifnames[j]) || isWifiIfname(ifnames[j]))
                                                continue;

                                        devices[ifnames[j]] = this.instantiateDevice(ifnames[j]);
                                }
                        }

                        for (var ifname in _state.netdevs) {
                                if (devices.hasOwnProperty(ifname))
                                        continue;

                                if (isIgnoredIfname(ifname) || isVirtualIfname(ifname) || isWifiIfname(ifname))
                                        continue;

                                devices[ifname] = this.instantiateDevice(ifname);
                        }

                        /* find VLAN devices */
                        var uciSwitchVLANs = uci.sections('network', 'switch_vlan');
                        for (var i = 0; i < uciSwitchVLANs.length; i++) {
                                if (typeof(uciSwitchVLANs[i].ports) != 'string' ||
                                    typeof(uciSwitchVLANs[i].device) != 'string' ||
                                    !_state.switches.hasOwnProperty(uciSwitchVLANs[i].device))
                                        continue;

                                var ports = uciSwitchVLANs[i].ports.split(/\s+/);
                                for (var j = 0; j < ports.length; j++) {
                                        var m = ports[j].match(/^(\d+)([tu]?)$/);
                                        if (m == null)
                                                continue;

                                        var netdev = _state.switches[uciSwitchVLANs[i].device].netdevs[m[1]];
                                        if (netdev == null)
                                                continue;

                                        if (!devices.hasOwnProperty(netdev))
                                                devices[netdev] = this.instantiateDevice(netdev);

                                        _state.isSwitch[netdev] = true;

                                        if (m[2] != 't')
                                                continue;

                                        var vid = uciSwitchVLANs[i].vid || uciSwitchVLANs[i].vlan;
                                            vid = (vid != null ? +vid : null);

                                        if (vid == null || vid < 0 || vid > 4095)
                                                continue;

                                        var vlandev = '%s.%d'.format(netdev, vid);

                                        if (!devices.hasOwnProperty(vlandev))
                                                devices[vlandev] = this.instantiateDevice(vlandev);

                                        _state.isSwitch[vlandev] = true;
                                }
                        }

                        /* find wireless interfaces */
                        var uciWifiIfaces = uci.sections('wireless', 'wifi-iface'),
                            networkCount = {};

                        for (var i = 0; i < uciWifiIfaces.length; i++) {
                                if (typeof(uciWifiIfaces[i].device) != 'string')
                                        continue;

                                networkCount[uciWifiIfaces[i].device] = (networkCount[uciWifiIfaces[i].device] || 0) + 1;

                                var netid = '%s.network%d'.format(uciWifiIfaces[i].device, networkCount[uciWifiIfaces[i].device]);

                                devices[netid] = this.instantiateDevice(netid);
                        }

                        var rv = [];

                        for (var netdev in devices)
                                if (devices.hasOwnProperty(netdev))
                                        rv.push(devices[netdev]);

                        rv.sort(deviceSort);

                        return rv;
                }, this));
        },

        /**
         * Test if a given network device name is in the list of patterns for
         * device names to ignore.
         *
         * Ignored device names are usually Linux network devices which are
         * spawned implicitly by kernel modules such as `tunl0` or `hwsim0`
         * and which are unsuitable for use in network configuration.
         *
         * @param {string} name
         * The device name to test.
         *
         * @returns {boolean}
         * Returns `true` if the given name is in the ignore pattern list,
         * else returns `false`.
         */
        isIgnoredDevice: function(name) {
                return isIgnoredIfname(name);
        },

        /**
         * Get a {@link LuCI.Network.WifiDevice WifiDevice} instance describing
         * the given wireless radio.
         *
         * @param {string} devname
         * The configuration name of the wireless radio to lookup, e.g. `radio0`
         * for the first mac80211 phy on the system.
         *
         * @returns {Promise<null|LuCI.Network.WifiDevice>}
         * Returns a promise resolving to the `WifiDevice` instance describing
         * the underlying radio device or `null` if the wireless radio could not
         * be found.
         */
        getWifiDevice: function(devname) {
                return initNetworkState().then(L.bind(function() {
                        var existingDevice = uci.get('wireless', devname);

                        if (existingDevice == null || existingDevice['.type'] != 'wifi-device')
                                return null;

                        return this.instantiateWifiDevice(devname, _state.radios[devname] || {});
                }, this));
        },

        /**
         * Obtain a list of all configured radio devices.
         *
         * @returns {Promise<Array<LuCI.Network.WifiDevice>>}
         * Returns a promise resolving to an array of `WifiDevice` instances
         * describing the wireless radios configured in the system.
         * The order of the array corresponds to the order of the radios in
         * the configuration.
         */
        getWifiDevices: function() {
                return initNetworkState().then(L.bind(function() {
                        var uciWifiDevices = uci.sections('wireless', 'wifi-device'),
                            rv = [];

                        for (var i = 0; i < uciWifiDevices.length; i++) {
                                var devname = uciWifiDevices[i]['.name'];
                                rv.push(this.instantiateWifiDevice(devname, _state.radios[devname] || {}));
                        }

                        return rv;
                }, this));
        },

        /**
         * Get a {@link LuCI.Network.WifiNetwork WifiNetwork} instance describing
         * the given wireless network.
         *
         * @param {string} netname
         * The name of the wireless network to lookup. This may be either an uci
         * configuration section ID, a network ID in the form `radio#.network#`
         * or a Linux network device name like `wlan0` which is resolved to the
         * corresponding configuration section through `ubus` runtime information.
         *
         * @returns {Promise<null|LuCI.Network.WifiNetwork>}
         * Returns a promise resolving to the `WifiNetwork` instance describing
         * the wireless network or `null` if the corresponding network could not
         * be found.
         */
        getWifiNetwork: function(netname) {
                var sid, res, netid, radioname, radiostate, netstate;

                return initNetworkState().then(L.bind(function() {
                        sid = getWifiSidByNetid(netname);

                        if (sid != null) {
                                res        = getWifiStateBySid(sid);
                                netid      = netname;
                                radioname  = res ? res[0] : null;
                                radiostate = res ? res[1] : null;
                                netstate   = res ? res[2] : null;
                        }
                        else {
                                res = getWifiStateByIfname(netname);

                                if (res != null) {
                                        radioname  = res[0];
                                        radiostate = res[1];
                                        netstate   = res[2];
                                        sid        = netstate.section;
                                        netid      = L.toArray(getWifiNetidBySid(sid))[0];
                                }
                                else {
                                        res = getWifiStateBySid(netname);

                                        if (res != null) {
                                                radioname  = res[0];
                                                radiostate = res[1];
                                                netstate   = res[2];
                                                sid        = netname;
                                                netid      = L.toArray(getWifiNetidBySid(sid))[0];
                                        }
                                        else {
                                                res = getWifiNetidBySid(netname);

                                                if (res != null) {
                                                        netid     = res[0];
                                                        radioname = res[1];
                                                        sid       = netname;
                                                }
                                        }
                                }
                        }

                        return this.instantiateWifiNetwork(sid || netname, radioname, radiostate, netid, netstate);
                }, this));
        },

        /**
         * Adds a new wireless network to the configuration and sets its options
         * to the provided values.
         *
         * @param {Object<string, string|string[]>} options
         * The options to set for the newly added wireless network. This object
         * must at least contain a `device` property which is set to the radio
         * name the new network belongs to.
         *
         * @returns {Promise<null|LuCI.Network.WifiNetwork>}
         * Returns a promise resolving to a `WifiNetwork` instance describing
         * the newly added wireless network or `null` if the given options
         * were invalid or if the associated radio device could not be found.
         */
        addWifiNetwork: function(options) {
                return initNetworkState().then(L.bind(function() {
                        if (options == null ||
                            typeof(options) != 'object' ||
                            typeof(options.device) != 'string')
                            return null;

                        var existingDevice = uci.get('wireless', options.device);
                        if (existingDevice == null || existingDevice['.type'] != 'wifi-device')
                                return null;

                        /* XXX: need to add a named section (wifinet#) here */
                        var sid = uci.add('wireless', 'wifi-iface');
                        for (var key in options)
                                if (options.hasOwnProperty(key))
                                        uci.set('wireless', sid, key, options[key]);

                        var radioname = existingDevice['.name'],
                            netid = getWifiNetidBySid(sid) || [];

                        return this.instantiateWifiNetwork(sid, radioname, _state.radios[radioname], netid[0], null);
                }, this));
        },

        /**
         * Deletes the given wireless network from the configuration.
         *
         * @param {string} netname
         * The name of the network to remove. This may be either a
         * network ID in the form `radio#.network#` or a Linux network device
         * name like `wlan0` which is resolved to the corresponding configuration
         * section through `ubus` runtime information.
         *
         * @returns {Promise<boolean>}
         * Returns a promise resolving to `true` if the wireless network has been
         * successfully deleted from the configuration or `false` if it could not
         * be found.
         */
        deleteWifiNetwork: function(netname) {
                return initNetworkState().then(L.bind(function() {
                        var sid = getWifiSidByIfname(netname);

                        if (sid == null)
                                return false;

                        uci.remove('wireless', sid);
                        return true;
                }, this));
        },

        /* private */
        getStatusByRoute: function(addr, mask) {
                return initNetworkState().then(L.bind(function() {
                        var rv = [];

                        for (var i = 0; i < _state.ifaces.length; i++) {
                                if (!Array.isArray(_state.ifaces[i].route))
                                        continue;

                                for (var j = 0; j < _state.ifaces[i].route.length; j++) {
                                        if (typeof(_state.ifaces[i].route[j]) != 'object' ||
                                            typeof(_state.ifaces[i].route[j].target) != 'string' ||
                                            typeof(_state.ifaces[i].route[j].mask) != 'number')
                                            continue;

                                        if (_state.ifaces[i].route[j].table)
                                                continue;

                                        if (_state.ifaces[i].route[j].target != addr ||
                                            _state.ifaces[i].route[j].mask != mask)
                                            continue;

                                        rv.push(_state.ifaces[i]);
                                }
                        }

                        return rv;
                }, this));
        },

        /* private */
        getStatusByAddress: function(addr) {
                return initNetworkState().then(L.bind(function() {
                        var rv = [];

                        for (var i = 0; i < _state.ifaces.length; i++) {
                                if (Array.isArray(_state.ifaces[i]['ipv4-address']))
                                        for (var j = 0; j < _state.ifaces[i]['ipv4-address'].length; j++)
                                                if (typeof(_state.ifaces[i]['ipv4-address'][j]) == 'object' &&
                                                    _state.ifaces[i]['ipv4-address'][j].address == addr)
                                                        return _state.ifaces[i];

                                if (Array.isArray(_state.ifaces[i]['ipv6-address']))
                                        for (var j = 0; j < _state.ifaces[i]['ipv6-address'].length; j++)
                                                if (typeof(_state.ifaces[i]['ipv6-address'][j]) == 'object' &&
                                                    _state.ifaces[i]['ipv6-address'][j].address == addr)
                                                        return _state.ifaces[i];

                                if (Array.isArray(_state.ifaces[i]['ipv6-prefix-assignment']))
                                        for (var j = 0; j < _state.ifaces[i]['ipv6-prefix-assignment'].length; j++)
                                                if (typeof(_state.ifaces[i]['ipv6-prefix-assignment'][j]) == 'object' &&
                                                        typeof(_state.ifaces[i]['ipv6-prefix-assignment'][j]['local-address']) == 'object' &&
                                                    _state.ifaces[i]['ipv6-prefix-assignment'][j]['local-address'].address == addr)
                                                        return _state.ifaces[i];
                        }

                        return null;
                }, this));
        },

        /**
         * Get IPv4 wan networks.
         *
         * This function looks up all networks having a default `0.0.0.0/0` route
         * and returns them as array.
         *
         * @returns {Promise<Array<LuCI.Network.Protocol>>}
         * Returns a promise resolving to an array of `Protocol` subclass
         * instances describing the found default route interfaces.
         */
        getWANNetworks: function() {
                return this.getStatusByRoute('0.0.0.0', 0).then(L.bind(function(statuses) {
                        var rv = [];

                        for (var i = 0; i < statuses.length; i++)
                                rv.push(this.instantiateNetwork(statuses[i].interface, statuses[i].proto));

                        return rv;
                }, this));
        },

        /**
         * Get IPv6 wan networks.
         *
         * This function looks up all networks having a default `::/0` route
         * and returns them as array.
         *
         * @returns {Promise<Array<LuCI.Network.Protocol>>}
         * Returns a promise resolving to an array of `Protocol` subclass
         * instances describing the found IPv6 default route interfaces.
         */
        getWAN6Networks: function() {
                return this.getStatusByRoute('::', 0).then(L.bind(function(statuses) {
                        var rv = [];

                        for (var i = 0; i < statuses.length; i++)
                                rv.push(this.instantiateNetwork(statuses[i].interface, statuses[i].proto));

                        return rv;
                }, this));
        },

        /**
         * Describes an swconfig switch topology by specifying the CPU
         * connections and external port labels of a switch.
         *
         * @typedef {Object<string, Object|Array>} SwitchTopology
         * @memberof LuCI.Network
         *
         * @property {Object<number, string>} netdevs
         * The `netdevs` property points to an object describing the CPU port
         * connections of the switch. The numeric key of the enclosed object is
         * the port number, the value contains the Linux network device name the
         * port is hardwired to.
         *
         * @property {Array<Object<string, boolean|number|string>>} ports
         * The `ports` property points to an array describing the populated
         * ports of the switch in the external label order. Each array item is
         * an object containg the following keys:
         *  - `num` - the internal switch port number
         *  - `label` - the label of the port, e.g. `LAN 1` or `CPU (eth0)`
         *  - `device` - the connected Linux network device name (CPU ports only)
         *  - `tagged` - a boolean indicating whether the port must be tagged to
         *     function (CPU ports only)
         */

        /**
         * Returns the topologies of all swconfig switches found on the system.
         *
         * @returns {Promise<Object<string, LuCI.Network.SwitchTopology>>}
         * Returns a promise resolving to an object containing the topologies
         * of each switch. The object keys correspond to the name of the switches
         * such as `switch0`, the values are
         * {@link LuCI.Network.SwitchTopology SwitchTopology} objects describing
         * the layout.
         */
        getSwitchTopologies: function() {
                return initNetworkState().then(function() {
                        return _state.switches;
                });
        },

        /* private */
        instantiateNetwork: function(name, proto) {
                if (name == null)
                        return null;

                proto = (proto == null ? uci.get('network', name, 'proto') : proto);

                var protoClass = _protocols[proto] || Protocol;
                return new protoClass(name);
        },

        /* private */
        instantiateDevice: function(name, network, extend) {
                if (extend != null)
                        return new (Device.extend(extend))(name, network);

                return new Device(name, network);
        },

        /* private */
        instantiateWifiDevice: function(radioname, radiostate) {
                return new WifiDevice(radioname, radiostate);
        },

        /* private */
        instantiateWifiNetwork: function(sid, radioname, radiostate, netid, netstate) {
                return new WifiNetwork(sid, radioname, radiostate, netid, netstate);
        },

        /**
         * Obtains the the network device name of the given object.
         *
         * @param {LuCI.Network.Protocol|LuCI.Network.Device|LuCI.Network.WifiDevice|LuCI.Network.WifiNetwork|string} obj
         * The object to get the device name from.
         *
         * @returns {null|string}
         * Returns a string containing the device name or `null` if the given
         * object could not be converted to a name.
         */
        getIfnameOf: function(obj) {
                return ifnameOf(obj);
        },

        /**
         * Queries the internal DSL modem type from board information.
         *
         * @returns {Promise<null|string>}
         * Returns a promise resolving to the type of the internal modem
         * (e.g. `vdsl`) or to `null` if no internal modem is present.
         */
        getDSLModemType: function() {
                return initNetworkState().then(function() {
                        return _state.hasDSLModem ? _state.hasDSLModem.type : null;
                });
        },

        /**
         * Queries aggregated information about known hosts.
         *
         * This function aggregates information from various sources such as
         * DHCP lease databases, ARP and IPv6 neighbour entries, wireless
         * association list etc. and returns a {@link LuCI.Network.Hosts Hosts}
         * class instance describing the found hosts.
         *
         * @returns {Promise<LuCI.Network.Hosts>}
         * Returns a `Hosts` instance describing host known on the system.
         */
        getHostHints: function() {
                return initNetworkState().then(function() {
                        return new Hosts(_state.hosts);
                });
        }
});

/**
 * @class
 * @memberof LuCI.Network
 * @hideconstructor
 * @classdesc
 *
 * The `LuCI.Network.Hosts` class encapsulates host information aggregated
 * from multiple sources and provides convenience functions to access the
 * host information by different criteria.
 */
Hosts = L.Class.extend(/** @lends LuCI.Network.Hosts.prototype */ {
        __init__: function(hosts) {
                this.hosts = hosts;
        },

        /**
         * Lookup the hostname associated with the given MAC address.
         *
         * @param {string} mac
         * The MAC address to lookup.
         *
         * @returns {null|string}
         * Returns the hostname associated with the given MAC or `null` if
         * no matching host could be found or if no hostname is known for
         * the corresponding host.
         */
        getHostnameByMACAddr: function(mac) {
                return this.hosts[mac] ? this.hosts[mac].name : null;
        },

        /**
         * Lookup the IPv4 address associated with the given MAC address.
         *
         * @param {string} mac
         * The MAC address to lookup.
         *
         * @returns {null|string}
         * Returns the IPv4 address associated with the given MAC or `null` if
         * no matching host could be found or if no IPv4 address is known for
         * the corresponding host.
         */
        getIPAddrByMACAddr: function(mac) {
                return this.hosts[mac] ? this.hosts[mac].ipv4 : null;
        },

        /**
         * Lookup the IPv6 address associated with the given MAC address.
         *
         * @param {string} mac
         * The MAC address to lookup.
         *
         * @returns {null|string}
         * Returns the IPv6 address associated with the given MAC or `null` if
         * no matching host could be found or if no IPv6 address is known for
         * the corresponding host.
         */
        getIP6AddrByMACAddr: function(mac) {
                return this.hosts[mac] ? this.hosts[mac].ipv6 : null;
        },

        /**
         * Lookup the hostname associated with the given IPv4 address.
         *
         * @param {string} ipaddr
         * The IPv4 address to lookup.
         *
         * @returns {null|string}
         * Returns the hostname associated with the given IPv4 or `null` if
         * no matching host could be found or if no hostname is known for
         * the corresponding host.
         */
        getHostnameByIPAddr: function(ipaddr) {
                for (var mac in this.hosts)
                        if (this.hosts[mac].ipv4 == ipaddr && this.hosts[mac].name != null)
                                return this.hosts[mac].name;
                return null;
        },

        /**
         * Lookup the MAC address associated with the given IPv4 address.
         *
         * @param {string} ipaddr
         * The IPv4 address to lookup.
         *
         * @returns {null|string}
         * Returns the MAC address associated with the given IPv4 or `null` if
         * no matching host could be found or if no MAC address is known for
         * the corresponding host.
         */
        getMACAddrByIPAddr: function(ipaddr) {
                for (var mac in this.hosts)
                        if (this.hosts[mac].ipv4 == ipaddr)
                                return mac;
                return null;
        },

        /**
         * Lookup the hostname associated with the given IPv6 address.
         *
         * @param {string} ipaddr
         * The IPv6 address to lookup.
         *
         * @returns {null|string}
         * Returns the hostname associated with the given IPv6 or `null` if
         * no matching host could be found or if no hostname is known for
         * the corresponding host.
         */
        getHostnameByIP6Addr: function(ip6addr) {
                for (var mac in this.hosts)
                        if (this.hosts[mac].ipv6 == ip6addr && this.hosts[mac].name != null)
                                return this.hosts[mac].name;
                return null;
        },

        /**
         * Lookup the MAC address associated with the given IPv6 address.
         *
         * @param {string} ipaddr
         * The IPv6 address to lookup.
         *
         * @returns {null|string}
         * Returns the MAC address associated with the given IPv6 or `null` if
         * no matching host could be found or if no MAC address is known for
         * the corresponding host.
         */
        getMACAddrByIP6Addr: function(ip6addr) {
                for (var mac in this.hosts)
                        if (this.hosts[mac].ipv6 == ip6addr)
                                return mac;
                return null;
        },

        /**
         * Return an array of (MAC address, name hint) tuples sorted by
         * MAC address.
         *
         * @param {boolean} [preferIp6=false]
         * Whether to prefer IPv6 addresses (`true`) or IPv4 addresses (`false`)
         * as name hint when no hostname is known for a specific MAC address.
         *
         * @returns {Array<Array<string>>}
         * Returns an array of arrays containing a name hint for each found
         * MAC address on the system. The array is sorted ascending by MAC.
         *
         * Each item of the resulting array is a two element array with the
         * MAC being the first element and the name hint being the second
         * element. The name hint is either the hostname, an IPv4 or an IPv6
         * address related to the MAC address.
         *
         * If no hostname but both IPv4 and IPv6 addresses are known, the
         * `preferIP6` flag specifies whether the IPv6 or the IPv4 address
         * is used as hint.
         */
        getMACHints: function(preferIp6) {
                var rv = [];
                for (var mac in this.hosts) {
                        var hint = this.hosts[mac].name ||
                                this.hosts[mac][preferIp6 ? 'ipv6' : 'ipv4'] ||
                                this.hosts[mac][preferIp6 ? 'ipv4' : 'ipv6'];

                        rv.push([mac, hint]);
                }
                return rv.sort(function(a, b) { return a[0] > b[0] });
        }
});

/**
 * @class
 * @memberof LuCI.Network
 * @hideconstructor
 * @classdesc
 *
 * The `Network.Protocol` class serves as base for protocol specific
 * subclasses which describe logical UCI networks defined by `config
 * interface` sections in `/etc/config/network`.
 */
Protocol = L.Class.extend(/** @lends LuCI.Network.Protocol.prototype */ {
        __init__: function(name) {
                this.sid = name;
        },

        _get: function(opt) {
                var val = uci.get('network', this.sid, opt);

                if (Array.isArray(val))
                        return val.join(' ');

                return val || '';
        },

        _ubus: function(field) {
                for (var i = 0; i < _state.ifaces.length; i++) {
                        if (_state.ifaces[i].interface != this.sid)
                                continue;

                        return (field != null ? _state.ifaces[i][field] : _state.ifaces[i]);
                }
        },

        /**
         * Read the given UCI option value of this network.
         *
         * @param {string} opt
         * The UCI option name to read.
         *
         * @returns {null|string|string[]}
         * Returns the UCI option value or `null` if the requested option is
         * not found.
         */
        get: function(opt) {
                return uci.get('network', this.sid, opt);
        },

        /**
         * Set the given UCI option of this network to the given value.
         *
         * @param {string} opt
         * The name of the UCI option to set.
         *
         * @param {null|string|string[]} val
         * The value to set or `null` to remove the given option from the
         * configuration.
         */
        set: function(opt, val) {
                return uci.set('network', this.sid, opt, val);
        },

        /**
         * Get the associared Linux network device of this network.
         *
         * @returns {null|string}
         * Returns the name of the associated network device or `null` if
         * it could not be determined.
         */
        getIfname: function() {
                var ifname;

                if (this.isFloating())
                        ifname = this._ubus('l3_device');
                else
                        ifname = this._ubus('device') || this._ubus('l3_device');

                if (ifname != null)
                        return ifname;

                var res = getWifiNetidByNetname(this.sid);
                return (res != null ? res[0] : null);
        },

        /**
         * Get the name of this network protocol class.
         *
         * This function will be overwritten by subclasses created by
         * {@link LuCI.Network#registerProtocol Network.registerProtocol()}.
         *
         * @abstract
         * @returns {string}
         * Returns the name of the network protocol implementation, e.g.
         * `static` or `dhcp`.
         */
        getProtocol: function() {
                return null;
        },

        /**
         * Return a human readable description for the protcol, such as
         * `Static address` or `DHCP client`.
         *
         * This function should be overwritten by subclasses.
         *
         * @abstract
         * @returns {string}
         * Returns the description string.
         */
        getI18n: function() {
                switch (this.getProtocol()) {
                case 'none':   return _('Unmanaged');
                case 'static': return _('Static address');
                case 'dhcp':   return _('DHCP client');
                default:       return _('Unknown');
                }
        },

        /**
         * Get the type of the underlying interface.
         *
         * This function actually is a convenience wrapper around
         * `proto.get("type")` and is mainly used by other `LuCI.Network` code
         * to check whether the interface is declared as bridge in UCI.
         *
         * @returns {null|string}
         * Returns the value of the `type` option of the associated logical
         * interface or `null` if no `type` option is set.
         */
        getType: function() {
                return this._get('type');
        },

        /**
         * Get the name of the associated logical interface.
         *
         * @returns {string}
         * Returns the logical interface name, such as `lan` or `wan`.
         */
        getName: function() {
                return this.sid;
        },

        /**
         * Get the uptime of the logical interface.
         *
         * @returns {number}
         * Returns the uptime of the associated interface in seconds.
         */
        getUptime: function() {
                return this._ubus('uptime') || 0;
        },

        /**
         * Get the logical interface expiry time in seconds.
         *
         * For protocols that have a concept of a lease, such as DHCP or
         * DHCPv6, this function returns the remaining time in seconds
         * until the lease expires.
         *
         * @returns {number}
         * Returns the amount of seconds until the lease expires or `-1`
         * if it isn't applicable to the associated protocol.
         */
        getExpiry: function() {
                var u = this._ubus('uptime'),
                    d = this._ubus('data');

                if (typeof(u) == 'number' && d != null &&
                    typeof(d) == 'object' && typeof(d.leasetime) == 'number') {
                        var r = d.leasetime - (u % d.leasetime);
                        return (r > 0 ? r : 0);
                }

                return -1;
        },

        /**
         * Get the metric value of the logical interface.
         *
         * @returns {number}
         * Returns the current metric value used for device and network
         * routes spawned by the associated logical interface.
         */
        getMetric: function() {
                return this._ubus('metric') || 0;
        },

        /**
         * Get the requested firewall zone name of the logical interface.
         *
         * Some protocol implementations request a specific firewall zone
         * to trigger inclusion of their resulting network devices into the
         * firewall rule set.
         *
         * @returns {null|string}
         * Returns the requested firewall zone name as published in the
         * `ubus` runtime information or `null` if the remote protocol
         * handler didn't request a zone.
         */
        getZoneName: function() {
                var d = this._ubus('data');

                if (L.isObject(d) && typeof(d.zone) == 'string')
                        return d.zone;

                return null;
        },

        /**
         * Query the first (primary) IPv4 address of the logical interface.
         *
         * @returns {null|string}
         * Returns the primary IPv4 address registered by the protocol handler
         * or `null` if no IPv4 addresses were set.
         */
        getIPAddr: function() {
                var addrs = this._ubus('ipv4-address');
                return ((Array.isArray(addrs) && addrs.length) ? addrs[0].address : null);
        },

        /**
         * Query all IPv4 addresses of the logical interface.
         *
         * @returns {string[]}
         * Returns an array of IPv4 addresses in CIDR notation which have been
         * registered by the protocol handler. The order of the resulting array
         * follows the order of the addresses in `ubus` runtime information.
         */
        getIPAddrs: function() {
                var addrs = this._ubus('ipv4-address'),
                    rv = [];

                if (Array.isArray(addrs))
                        for (var i = 0; i < addrs.length; i++)
                                rv.push('%s/%d'.format(addrs[i].address, addrs[i].mask));

                return rv;
        },

        /**
         * Query the first (primary) IPv4 netmask of the logical interface.
         *
         * @returns {null|string}
         * Returns the netmask of the primary IPv4 address registered by the
         * protocol handler or `null` if no IPv4 addresses were set.
         */
        getNetmask: function() {
                var addrs = this._ubus('ipv4-address');
                if (Array.isArray(addrs) && addrs.length)
                        return prefixToMask(addrs[0].mask, false);
        },

        /**
         * Query the gateway (nexthop) of the default route associated with
         * this logical interface.
         *
         * @returns {string}
         * Returns a string containing the IPv4 nexthop address of the associated
         * default route or `null` if no default route was found.
         */
        getGatewayAddr: function() {
                var routes = this._ubus('route');

                if (Array.isArray(routes))
                        for (var i = 0; i < routes.length; i++)
                                if (typeof(routes[i]) == 'object' &&
                                    routes[i].target == '0.0.0.0' &&
                                    routes[i].mask == 0)
                                    return routes[i].nexthop;

                return null;
        },

        /**
         * Query the IPv4 DNS servers associated with the logical interface.
         *
         * @returns {string[]}
         * Returns an array of IPv4 DNS servers registered by the remote
         * protocol backend.
         */
        getDNSAddrs: function() {
                var addrs = this._ubus('dns-server'),
                    rv = [];

                if (Array.isArray(addrs))
                        for (var i = 0; i < addrs.length; i++)
                                if (!/:/.test(addrs[i]))
                                        rv.push(addrs[i]);

                return rv;
        },

        /**
         * Query the first (primary) IPv6 address of the logical interface.
         *
         * @returns {null|string}
         * Returns the primary IPv6 address registered by the protocol handler
         * in CIDR notation or `null` if no IPv6 addresses were set.
         */
        getIP6Addr: function() {
                var addrs = this._ubus('ipv6-address');

                if (Array.isArray(addrs) && L.isObject(addrs[0]))
                        return '%s/%d'.format(addrs[0].address, addrs[0].mask);

                addrs = this._ubus('ipv6-prefix-assignment');

                if (Array.isArray(addrs) && L.isObject(addrs[0]) && L.isObject(addrs[0]['local-address']))
                        return '%s/%d'.format(addrs[0]['local-address'].address, addrs[0]['local-address'].mask);

                return null;
        },

        /**
         * Query all IPv6 addresses of the logical interface.
         *
         * @returns {string[]}
         * Returns an array of IPv6 addresses in CIDR notation which have been
         * registered by the protocol handler. The order of the resulting array
         * follows the order of the addresses in `ubus` runtime information.
         */
        getIP6Addrs: function() {
                var addrs = this._ubus('ipv6-address'),
                    rv = [];

                if (Array.isArray(addrs))
                        for (var i = 0; i < addrs.length; i++)
                                if (L.isObject(addrs[i]))
                                        rv.push('%s/%d'.format(addrs[i].address, addrs[i].mask));

                addrs = this._ubus('ipv6-prefix-assignment');

                if (Array.isArray(addrs))
                        for (var i = 0; i < addrs.length; i++)
                                if (L.isObject(addrs[i]) && L.isObject(addrs[i]['local-address']))
                                        rv.push('%s/%d'.format(addrs[i]['local-address'].address, addrs[i]['local-address'].mask));

                return rv;
        },

        /**
         * Query the gateway (nexthop) of the IPv6 default route associated with
         * this logical interface.
         *
         * @returns {string}
         * Returns a string containing the IPv6 nexthop address of the associated
         * default route or `null` if no default route was found.
         */
        getGateway6Addr: function() {
                var routes = this._ubus('route');

                if (Array.isArray(routes))
                        for (var i = 0; i < routes.length; i++)
                                if (typeof(routes[i]) == 'object' &&
                                    routes[i].target == '::' &&
                                    routes[i].mask == 0)
                                    return routes[i].nexthop;

                return null;
        },

        /**
         * Query the IPv6 DNS servers associated with the logical interface.
         *
         * @returns {string[]}
         * Returns an array of IPv6 DNS servers registered by the remote
         * protocol backend.
         */
        getDNS6Addrs: function() {
                var addrs = this._ubus('dns-server'),
                    rv = [];

                if (Array.isArray(addrs))
                        for (var i = 0; i < addrs.length; i++)
                                if (/:/.test(addrs[i]))
                                        rv.push(addrs[i]);

                return rv;
        },

        /**
         * Query the routed IPv6 prefix associated with the logical interface.
         *
         * @returns {null|string}
         * Returns the routed IPv6 prefix registered by the remote protocol
         * handler or `null` if no prefix is present.
         */
        getIP6Prefix: function() {
                var prefixes = this._ubus('ipv6-prefix');

                if (Array.isArray(prefixes) && L.isObject(prefixes[0]))
                        return '%s/%d'.format(prefixes[0].address, prefixes[0].mask);

                return null;
        },

        /**
         * Query interface error messages published in `ubus` runtime state.
         *
         * Interface errors are emitted by remote protocol handlers if the setup
         * of the underlying logical interface failed, e.g. due to bad
         * configuration or network connectivity issues.
         *
         * This function will translate the found error codes to human readable
         * messages using the descriptions registered by
         * {@link LuCI.Network#registerErrorCode Network.registerErrorCode()}
         * and fall back to `"Unknown error (%s)"` where `%s` is replaced by the
         * error code in case no translation can be found.
         *
         * @returns {string[]}
         * Returns an array of translated interface error messages.
         */
        getErrors: function() {
                var errors = this._ubus('errors'),
                    rv = null;

                if (Array.isArray(errors)) {
                        for (var i = 0; i < errors.length; i++) {
                                if (!L.isObject(errors[i]) || typeof(errors[i].code) != 'string')
                                        continue;

                                rv = rv || [];
                                rv.push(proto_errors[errors[i].code] || _('Unknown error (%s)').format(errors[i].code));
                        }
                }

                return rv;
        },

        /**
         * Checks whether the underlying logical interface is declared as bridge.
         *
         * @returns {boolean}
         * Returns `true` when the interface is declared with `option type bridge`
         * and when the associated protocol implementation is not marked virtual
         * or `false` when the logical interface is no bridge.
         */
        isBridge: function() {
                return (!this.isVirtual() && this.getType() == 'bridge');
        },

        /**
         * Get the name of the opkg package providing the protocol functionality.
         *
         * This function should be overwritten by protocol specific subclasses.
         *
         * @abstract
         *
         * @returns {string}
         * Returns the name of the opkg package required for the protocol to
         * function, e.g. `odhcp6c` for the `dhcpv6` prototocol.
         */
        getOpkgPackage: function() {
                return null;
        },

        /**
         * Checks whether the protocol functionality is installed.
         *
         * This function exists for compatibility with old code, it always
         * returns `true`.
         *
         * @deprecated
         * @abstract
         *
         * @returns {boolean}
         * Returns `true` if the protocol support is installed, else `false`.
         */
        isInstalled: function() {
                return true;
        },

        /**
         * Checks whether this protocol is "virtual".
         *
         * A "virtual" protocol is a protocol which spawns its own interfaces
         * on demand instead of using existing physical interfaces.
         *
         * Examples for virtual protocols are `6in4` which `gre` spawn tunnel
         * network device on startup, examples for non-virtual protcols are
         * `dhcp` or `static` which apply IP configuration to existing interfaces.
         *
         * This function should be overwritten by subclasses.
         *
         * @returns {boolean}
         * Returns a boolean indicating whether the underlying protocol spawns
         * dynamic interfaces (`true`) or not (`false`).
         */
        isVirtual: function() {
                return false;
        },

        /**
         * Checks whether this protocol is "floating".
         *
         * A "floating" protocol is a protocol which spawns its own interfaces
         * on demand, like a virtual one but which relies on an existinf lower
         * level interface to initiate the connection.
         *
         * An example for such a protocol is "pppoe".
         *
         * This function exists for backwards compatibility with older code
         * but should not be used anymore.
         *
         * @deprecated
         * @returns {boolean}
         * Returns a boolean indicating whether this protocol is floating (`true`)
         * or not (`false`).
         */
        isFloating: function() {
                return false;
        },

        /**
         * Checks whether this logical interface is dynamic.
         *
         * A dynamic interface is an interface which has been created at runtime,
         * e.g. as sub-interface of another interface, but which is not backed by
         * any user configuration. Such dynamic interfaces cannot be edited but
         * only brought down or restarted.
         *
         * @returns {boolean}
         * Returns a boolean indicating whether this interface is dynamic (`true`)
         * or not (`false`).
         */
        isDynamic: function() {
                return (this._ubus('dynamic') == true);
        },

        /**
         * Checks whether this interface is an alias interface.
         *
         * Alias interfaces are interfaces layering on top of another interface
         * and are denoted by a special `@interfacename` notation in the
         * underlying `ifname` option.
         *
         * @returns {null|string}
         * Returns the name of the parent interface if this logical interface
         * is an alias or `null` if it is not an alias interface.
         */
        isAlias: function() {
                var ifnames = L.toArray(uci.get('network', this.sid, 'ifname')),
                    parent = null;

                for (var i = 0; i < ifnames.length; i++)
                        if (ifnames[i].charAt(0) == '@')
                                parent = ifnames[i].substr(1);
                        else if (parent != null)
                                parent = null;

                return parent;
        },

        /**
         * Checks whether this logical interface is "empty", meaning that ut
         * has no network devices attached.
         *
         * @returns {boolean}
         * Returns `true` if this logical interface is empty, else `false`.
         */
        isEmpty: function() {
                if (this.isFloating())
                        return false;

                var empty = true,
                    ifname = this._get('ifname');

                if (ifname != null && ifname.match(/\S+/))
                        empty = false;

                if (empty == true && getWifiNetidBySid(this.sid) != null)
                        empty = false;

                return empty;
        },

        /**
         * Checks whether this logical interface is configured and running.
         *
         * @returns {boolean}
         * Returns `true` when the interface is active or `false` when it is not.
         */
        isUp: function() {
                return (this._ubus('up') == true);
        },

        /**
         * Add the given network device to the logical interface.
         *
         * @param {LuCI.Network.Protocol|LuCI.Network.Device|LuCI.Network.WifiDevice|LuCI.Network.WifiNetwork|string} device
         * The object or device name to add to the logical interface. In case the
         * given argument is not a string, it is resolved though the
         * {@link LuCI.Network#getIfnameOf Network.getIfnameOf()} function.
         *
         * @returns {boolean}
         * Returns `true` if the device name has been added or `false` if any
         * argument was invalid, if the device was already part of the logical
         * interface or if the logical interface is virtual.
         */
        addDevice: function(ifname) {
                ifname = ifnameOf(ifname);

                if (ifname == null || this.isFloating())
                        return false;

                var wif = getWifiSidByIfname(ifname);

                if (wif != null)
                        return appendValue('wireless', wif, 'network', this.sid);

                return appendValue('network', this.sid, 'ifname', ifname);
        },

        /**
         * Remove the given network device from the logical interface.
         *
         * @param {LuCI.Network.Protocol|LuCI.Network.Device|LuCI.Network.WifiDevice|LuCI.Network.WifiNetwork|string} device
         * The object or device name to remove from the logical interface. In case
         * the given argument is not a string, it is resolved though the
         * {@link LuCI.Network#getIfnameOf Network.getIfnameOf()} function.
         *
         * @returns {boolean}
         * Returns `true` if the device name has been added or `false` if any
         * argument was invalid, if the device was already part of the logical
         * interface or if the logical interface is virtual.
         */
        deleteDevice: function(ifname) {
                var rv = false;

                ifname = ifnameOf(ifname);

                if (ifname == null || this.isFloating())
                        return false;

                var wif = getWifiSidByIfname(ifname);

                if (wif != null)
                        rv = removeValue('wireless', wif, 'network', this.sid);

                if (removeValue('network', this.sid, 'ifname', ifname))
                        rv = true;

                return rv;
        },

        /**
         * Returns the Linux network device associated with this logical
         * interface.
         *
         * @returns {LuCI.Network.Device}
         * Returns a `Network.Device` class instance representing the
         * expected Linux network device according to the configuration.
         */
        getDevice: function() {
                if (this.isVirtual()) {
                        var ifname = '%s-%s'.format(this.getProtocol(), this.sid);
                        _state.isTunnel[this.getProtocol() + '-' + this.sid] = true;
                        return L.network.instantiateDevice(ifname, this);
                }
                else if (this.isBridge()) {
                        var ifname = 'br-%s'.format(this.sid);
                        _state.isBridge[ifname] = true;
                        return new Device(ifname, this);
                }
                else {
                        var ifnames = L.toArray(uci.get('network', this.sid, 'ifname'));

                        for (var i = 0; i < ifnames.length; i++) {
                                var m = ifnames[i].match(/^([^:/]+)/);
                                return ((m && m[1]) ? L.network.instantiateDevice(m[1], this) : null);
                        }

                        ifname = getWifiNetidByNetname(this.sid);

                        return (ifname != null ? L.network.instantiateDevice(ifname[0], this) : null);
                }
        },

        /**
         * Returns the layer 2 linux network device currently associated
         * with this logical interface.
         *
         * @returns {LuCI.Network.Device}
         * Returns a `Network.Device` class instance representing the Linux
         * network device currently associated with the logical interface.
         */
        getL2Device: function() {
                var ifname = this._ubus('device');
                return (ifname != null ? L.network.instantiateDevice(ifname, this) : null);
        },

        /**
         * Returns the layer 3 linux network device currently associated
         * with this logical interface.
         *
         * @returns {LuCI.Network.Device}
         * Returns a `Network.Device` class instance representing the Linux
         * network device currently associated with the logical interface.
         */
        getL3Device: function() {
                var ifname = this._ubus('l3_device');
                return (ifname != null ? L.network.instantiateDevice(ifname, this) : null);
        },

        /**
         * Returns a list of network sub-devices associated with this logical
         * interface.
         *
         * @returns {null|Array<LuCI.Network.Device>}
         * Returns an array of of `Network.Device` class instances representing
         * the sub-devices attached to this logical interface or `null` if the
         * logical interface does not support sub-devices, e.g. because it is
         * virtual and not a bridge.
         */
        getDevices: function() {
                var rv = [];

                if (!this.isBridge() && !(this.isVirtual() && !this.isFloating()))
                        return null;

                var ifnames = L.toArray(uci.get('network', this.sid, 'ifname'));

                for (var i = 0; i < ifnames.length; i++) {
                        if (ifnames[i].charAt(0) == '@')
                                continue;

                        var m = ifnames[i].match(/^([^:/]+)/);
                        if (m != null)
                                rv.push(L.network.instantiateDevice(m[1], this));
                }

                var uciWifiIfaces = uci.sections('wireless', 'wifi-iface');

                for (var i = 0; i < uciWifiIfaces.length; i++) {
                        if (typeof(uciWifiIfaces[i].device) != 'string')
                                continue;

                        var networks = L.toArray(uciWifiIfaces[i].network);

                        for (var j = 0; j < networks.length; j++) {
                                if (networks[j] != this.sid)
                                        continue;

                                var netid = getWifiNetidBySid(uciWifiIfaces[i]['.name']);

                                if (netid != null)
                                        rv.push(L.network.instantiateDevice(netid[0], this));
                        }
                }

                rv.sort(deviceSort);

                return rv;
        },

        /**
         * Checks whether this logical interface contains the given device
         * object.
         *
         * @param {LuCI.Network.Protocol|LuCI.Network.Device|LuCI.Network.WifiDevice|LuCI.Network.WifiNetwork|string} device
         * The object or device name to check. In case the given argument is not
         * a string, it is resolved though the
         * {@link LuCI.Network#getIfnameOf Network.getIfnameOf()} function.
         *
         * @returns {boolean}
         * Returns `true` when this logical interface contains the given network
         * device or `false` if not.
         */
        containsDevice: function(ifname) {
                ifname = ifnameOf(ifname);

                if (ifname == null)
                        return false;
                else if (this.isVirtual() && '%s-%s'.format(this.getProtocol(), this.sid) == ifname)
                        return true;
                else if (this.isBridge() && 'br-%s'.format(this.sid) == ifname)
                        return true;

                var ifnames = L.toArray(uci.get('network', this.sid, 'ifname'));

                for (var i = 0; i < ifnames.length; i++) {
                        var m = ifnames[i].match(/^([^:/]+)/);
                        if (m != null && m[1] == ifname)
                                return true;
                }

                var wif = getWifiSidByIfname(ifname);

                if (wif != null) {
                        var networks = L.toArray(uci.get('wireless', wif, 'network'));

                        for (var i = 0; i < networks.length; i++)
                                if (networks[i] == this.sid)
                                        return true;
                }

                return false;
        }
});

/**
 * @class
 * @memberof LuCI.Network
 * @hideconstructor
 * @classdesc
 *
 * A `Network.Device` class instance represents an underlying Linux network
 * device and allows querying device details such as packet statistics or MTU.
 */
Device = L.Class.extend(/** @lends LuCI.Network.Device.prototype */ {
        __init__: function(ifname, network) {
                var wif = getWifiSidByIfname(ifname);

                if (wif != null) {
                        var res = getWifiStateBySid(wif) || [],
                            netid = getWifiNetidBySid(wif) || [];

                        this.wif    = new WifiNetwork(wif, res[0], res[1], netid[0], res[2], { ifname: ifname });
                        this.ifname = this.wif.getIfname();
                }

                this.ifname  = this.ifname || ifname;
                this.dev     = _state.netdevs[this.ifname];
                this.network = network;
        },

        _devstate: function(/* ... */) {
                var rv = this.dev;

                for (var i = 0; i < arguments.length; i++)
                        if (L.isObject(rv))
                                rv = rv[arguments[i]];
                        else
                                return null;

                return rv;
        },

        /**
         * Get the name of the network device.
         *
         * @returns {string}
         * Returns the name of the device, e.g. `eth0` or `wlan0`.
         */
        getName: function() {
                return (this.wif != null ? this.wif.getIfname() : this.ifname);
        },

        /**
         * Get the MAC address of the device.
         *
         * @returns {null|string}
         * Returns the MAC address of the device or `null` if not applicable,
         * e.g. for non-ethernet tunnel devices.
         */
        getMAC: function() {
                var mac = this._devstate('macaddr');
                return mac ? mac.toUpperCase() : null;
        },

        /**
         * Get the MTU of the device.
         *
         * @returns {number}
         * Returns the MTU of the device.
         */
        getMTU: function() {
                return this._devstate('mtu');
        },

        /**
         * Get the IPv4 addresses configured on the device.
         *
         * @returns {string[]}
         * Returns an array of IPv4 address strings.
         */
        getIPAddrs: function() {
                var addrs = this._devstate('ipaddrs');
                return (Array.isArray(addrs) ? addrs : []);
        },

        /**
         * Get the IPv6 addresses configured on the device.
         *
         * @returns {string[]}
         * Returns an array of IPv6 address strings.
         */
        getIP6Addrs: function() {
                var addrs = this._devstate('ip6addrs');
                return (Array.isArray(addrs) ? addrs : []);
        },

        /**
         * Get the type of the device..
         *
         * @returns {string}
         * Returns a string describing the type of the network device:
         *  - `alias` if it is an abstract alias device (`@` notation)
         *  - `wifi` if it is a wireless interface (e.g. `wlan0`)
         *  - `bridge` if it is a bridge device (e.g. `br-lan`)
         *  - `tunnel` if it is a tun or tap device (e.g. `tun0`)
         *  - `vlan` if it is a vlan device (e.g. `eth0.1`)
         *  - `switch` if it is a switch device (e.g.`eth1` connected to switch0)
         *  - `ethernet` for all other device types
         */
        getType: function() {
                if (this.ifname != null && this.ifname.charAt(0) == '@')
                        return 'alias';
                else if (this.wif != null || isWifiIfname(this.ifname))
                        return 'wifi';
                else if (_state.isBridge[this.ifname])
                        return 'bridge';
                else if (_state.isTunnel[this.ifname])
                        return 'tunnel';
                else if (this.ifname.indexOf('.') > -1)
                        return 'vlan';
                else if (_state.isSwitch[this.ifname])
                        return 'switch';
                else
                        return 'ethernet';
        },

        /**
         * Get a short description string for the device.
         *
         * @returns {string}
         * Returns the device name for non-wifi devices or a string containing
         * the operation mode and SSID for wifi devices.
         */
        getShortName: function() {
                if (this.wif != null)
                        return this.wif.getShortName();

                return this.ifname;
        },

        /**
         * Get a long description string for the device.
         *
         * @returns {string}
         * Returns a string containing the type description and device name
         * for non-wifi devices or operation mode and ssid for wifi ones.
         */
        getI18n: function() {
                if (this.wif != null) {
                        return '%s: %s "%s"'.format(
                                _('Wireless Network'),
                                this.wif.getActiveMode(),
                                this.wif.getActiveSSID() || this.wif.getActiveBSSID() || this.wif.getID() || '?');
                }

                return '%s: "%s"'.format(this.getTypeI18n(), this.getName());
        },

        /**
         * Get a string describing the device type.
         *
         * @returns {string}
         * Returns a string describing the type, e.g. "Wireless Adapter" or
         * "Bridge".
         */
        getTypeI18n: function() {
                switch (this.getType()) {
                case 'alias':
                        return _('Alias Interface');

                case 'wifi':
                        return _('Wireless Adapter');

                case 'bridge':
                        return _('Bridge');

                case 'switch':
                        return _('Ethernet Switch');

                case 'vlan':
                        return (_state.isSwitch[this.ifname] ? _('Switch VLAN') : _('Software VLAN'));

                case 'tunnel':
                        return _('Tunnel Interface');

                default:
                        return _('Ethernet Adapter');
                }
        },

        /**
         * Get the associated bridge ports of the device.
         *
         * @returns {null|Array<LuCI.Network.Device>}
         * Returns an array of `Network.Device` instances representing the ports
         * (slave interfaces) of the bridge or `null` when this device isn't
         * a Linux bridge.
         */
        getPorts: function() {
                var br = _state.bridges[this.ifname],
                    rv = [];

                if (br == null || !Array.isArray(br.ifnames))
                        return null;

                for (var i = 0; i < br.ifnames.length; i++)
                        rv.push(L.network.instantiateDevice(br.ifnames[i].name));

                rv.sort(deviceSort);

                return rv;
        },

        /**
         * Get the bridge ID
         *
         * @returns {null|string}
         * Returns the ID of this network bridge or `null` if this network
         * device is not a Linux bridge.
         */
        getBridgeID: function() {
                var br = _state.bridges[this.ifname];
                return (br != null ? br.id : null);
        },

        /**
         * Get the bridge STP setting
         *
         * @returns {boolean}
         * Returns `true` when this device is a Linux bridge and has `stp`
         * enabled, else `false`.
         */
        getBridgeSTP: function() {
                var br = _state.bridges[this.ifname];
                return (br != null ? !!br.stp : false);
        },

        /**
         * Checks whether this device is up.
         *
         * @returns {boolean}
         * Returns `true` when the associated device is running pr `false`
         * when it is down or absent.
         */
        isUp: function() {
                var up = this._devstate('flags', 'up');

                if (up == null)
                        up = (this.getType() == 'alias');

                return up;
        },

        /**
         * Checks whether this device is a Linux bridge.
         *
         * @returns {boolean}
         * Returns `true` when the network device is present and a Linux bridge,
         * else `false`.
         */
        isBridge: function() {
                return (this.getType() == 'bridge');
        },

        /**
         * Checks whether this device is part of a Linux bridge.
         *
         * @returns {boolean}
         * Returns `true` when this network device is part of a bridge,
         * else `false`.
         */
        isBridgePort: function() {
                return (this._devstate('bridge') != null);
        },

        /**
         * Get the amount of transmitted bytes.
         *
         * @returns {number}
         * Returns the amount of bytes transmitted by the network device.
         */
        getTXBytes: function() {
                var stat = this._devstate('stats');
                return (stat != null ? stat.tx_bytes || 0 : 0);
        },

        /**
         * Get the amount of received bytes.
         *
         * @returns {number}
         * Returns the amount of bytes received by the network device.
         */
        getRXBytes: function() {
                var stat = this._devstate('stats');
                return (stat != null ? stat.rx_bytes || 0 : 0);
        },

        /**
         * Get the amount of transmitted packets.
         *
         * @returns {number}
         * Returns the amount of packets transmitted by the network device.
         */
        getTXPackets: function() {
                var stat = this._devstate('stats');
                return (stat != null ? stat.tx_packets || 0 : 0);
        },

        /**
         * Get the amount of received packets.
         *
         * @returns {number}
         * Returns the amount of packets received by the network device.
         */
        getRXPackets: function() {
                var stat = this._devstate('stats');
                return (stat != null ? stat.rx_packets || 0 : 0);
        },

        /**
         * Get the primary logical interface this device is assigned to.
         *
         * @returns {null|LuCI.Network.Protocol}
         * Returns a `Network.Protocol` instance representing the logical
         * interface this device is attached to or `null` if it is not
         * assigned to any logical interface.
         */
        getNetwork: function() {
                return this.getNetworks()[0];
        },

        /**
         * Get the logical interfaces this device is assigned to.
         *
         * @returns {Array<LuCI.Network.Protocol>}
         * Returns an array of `Network.Protocol` instances representing the
         * logical interfaces this device is assigned to.
         */
        getNetworks: function() {
                if (this.networks == null) {
                        this.networks = [];

                        var networks = enumerateNetworks.apply(L.network);

                        for (var i = 0; i < networks.length; i++)
                                if (networks[i].containsDevice(this.ifname) || networks[i].getIfname() == this.ifname)
                                        this.networks.push(networks[i]);

                        this.networks.sort(networkSort);
                }

                return this.networks;
        },

        /**
         * Get the related wireless network this device is related to.
         *
         * @returns {null|LuCI.Network.WifiNetwork}
         * Returns a `Network.WifiNetwork` instance representing the wireless
         * network corresponding to this network device or `null` if this device
         * is not a wireless device.
         */
        getWifiNetwork: function() {
                return (this.wif != null ? this.wif : null);
        }
});

/**
 * @class
 * @memberof LuCI.Network
 * @hideconstructor
 * @classdesc
 *
 * A `Network.WifiDevice` class instance represents a wireless radio device
 * present on the system and provides wireless capability information as
 * well as methods for enumerating related wireless networks.
 */
WifiDevice = L.Class.extend(/** @lends LuCI.Network.WifiDevice.prototype */ {
        __init__: function(name, radiostate) {
                var uciWifiDevice = uci.get('wireless', name);

                if (uciWifiDevice != null &&
                    uciWifiDevice['.type'] == 'wifi-device' &&
                    uciWifiDevice['.name'] != null) {
                        this.sid    = uciWifiDevice['.name'];
                }

                this.sid    = this.sid || name;
                this._ubusdata = {
                        radio: name,
                        dev:   radiostate
                };
        },

        /* private */
        ubus: function(/* ... */) {
                var v = this._ubusdata;

                for (var i = 0; i < arguments.length; i++)
                        if (L.isObject(v))
                                v = v[arguments[i]];
                        else
                                return null;

                return v;
        },

        /**
         * Read the given UCI option value of this wireless device.
         *
         * @param {string} opt
         * The UCI option name to read.
         *
         * @returns {null|string|string[]}
         * Returns the UCI option value or `null` if the requested option is
         * not found.
         */
        get: function(opt) {
                return uci.get('wireless', this.sid, opt);
        },

        /**
         * Set the given UCI option of this network to the given value.
         *
         * @param {string} opt
         * The name of the UCI option to set.
         *
         * @param {null|string|string[]} val
         * The value to set or `null` to remove the given option from the
         * configuration.
         */
        set: function(opt, value) {
                return uci.set('wireless', this.sid, opt, value);
        },

        /**
         * Checks whether this wireless radio is disabled.
         *
         * @returns {boolean}
         * Returns `true` when the wireless radio is marked as disabled in `ubus`
         * runtime state or when the `disabled` option is set in the corresponding
         * UCI configuration.
         */
        isDisabled: function() {
                return this.ubus('dev', 'disabled') || this.get('disabled') == '1';
        },

        /**
         * Get the configuration name of this wireless radio.
         *
         * @returns {string}
         * Returns the UCI section name (e.g. `radio0`) of the corresponding
         * radio configuration which also serves as unique logical identifier
         * for the wireless phy.
         */
        getName: function() {
                return this.sid;
        },

        /**
         * Gets a list of supported hwmodes.
         *
         * The hwmode values describe the frequency band and wireless standard
         * versions supported by the wireless phy.
         *
         * @returns {string[]}
         * Returns an array of valid hwmode values for this radio. Currently
         * known mode values are:
         *  - `a` - Legacy 802.11a mode, 5 GHz, up to 54 Mbit/s
         *  - `b` - Legacy 802.11b mode, 2.4 GHz, up to 11 Mbit/s
         *  - `g` - Legacy 802.11g mode, 2.4 GHz, up to 54 Mbit/s
         *  - `n` - IEEE 802.11n mode, 2.4 or 5 GHz, up to 600 Mbit/s
         *  - `ac` - IEEE 802.11ac mode, 5 GHz, up to 6770 Mbit/s
         */
        getHWModes: function() {
                var hwmodes = this.ubus('dev', 'iwinfo', 'hwmodes');
                return Array.isArray(hwmodes) ? hwmodes : [ 'b', 'g' ];
        },

        /**
         * Gets a list of supported htmodes.
         *
         * The htmode values describe the wide-frequency options supported by
         * the wireless phy.
         *
         * @returns {string[]}
         * Returns an array of valid htmode values for this radio. Currently
         * known mode values are:
         *  - `HT20` - applicable to IEEE 802.11n, 20 MHz wide channels
         *  - `HT40` - applicable to IEEE 802.11n, 40 MHz wide channels
         *  - `VHT20` - applicable to IEEE 802.11ac, 20 MHz wide channels
         *  - `VHT40` - applicable to IEEE 802.11ac, 40 MHz wide channels
         *  - `VHT80` - applicable to IEEE 802.11ac, 80 MHz wide channels
         *  - `VHT160` - applicable to IEEE 802.11ac, 160 MHz wide channels
         */
        getHTModes: function() {
                var htmodes = this.ubus('dev', 'iwinfo', 'htmodes');
                return (Array.isArray(htmodes) && htmodes.length) ? htmodes : null;
        },

        /**
         * Get a string describing the wireless radio hardware.
         *
         * @returns {string}
         * Returns the description string.
         */
        getI18n: function() {
                var hw = this.ubus('dev', 'iwinfo', 'hardware'),
                    type = L.isObject(hw) ? hw.name : null;

                if (this.ubus('dev', 'iwinfo', 'type') == 'wl')
                        type = 'Broadcom';

                var hwmodes = this.getHWModes(),
                    modestr = '';

                hwmodes.sort(function(a, b) {
                        return (a.length != b.length ? a.length > b.length : a > b);
                });

                modestr = hwmodes.join('');

                return '%s 802.11%s Wireless Controller (%s)'.format(type || 'Generic', modestr, this.getName());
        },

        /**
         * A wireless scan result object describes a neighbouring wireless
         * network found in the vincinity.
         *
         * @typedef {Object<string, number|string|LuCI.Network.WifiEncryption>} WifiScanResult
         * @memberof LuCI.Network
         *
         * @property {string} ssid
         * The SSID / Mesh ID of the network.
         *
         * @property {string} bssid
         * The BSSID if the network.
         *
         * @property {string} mode
         * The operation mode of the network (`Master`, `Ad-Hoc`, `Mesh Point`).
         *
         * @property {number} channel
         * The wireless channel of the network.
         *
         * @property {number} signal
         * The received signal strength of the network in dBm.
         *
         * @property {number} quality
         * The numeric quality level of the signal, can be used in conjunction
         * with `quality_max` to calculate a quality percentage.
         *
         * @property {number} quality_max
         * The maximum possible quality level of the signal, can be used in
         * conjunction with `quality` to calculate a quality percentage.
         *
         * @property {LuCI.Network.WifiEncryption} encryption
         * The encryption used by the wireless network.
         */

        /**
         * Trigger a wireless scan on this radio device and obtain a list of
         * nearby networks.
         *
         * @returns {Promise<Array<LuCI.Network.WifiScanResult>>}
         * Returns a promise resolving to an array of scan result objects
         * describing the networks found in the vincinity.
         */
        getScanList: function() {
                return callIwinfoScan(this.sid);
        },

        /**
         * Check whether the wireless radio is marked as up in the `ubus`
         * runtime state.
         *
         * @returns {boolean}
         * Returns `true` when the radio device is up, else `false`.
         */
        isUp: function() {
                if (L.isObject(_state.radios[this.sid]))
                        return (_state.radios[this.sid].up == true);

                return false;
        },

        /**
         * Get the wifi network of the given name belonging to this radio device
         *
         * @param {string} network
         * The name of the wireless network to lookup. This may be either an uci
         * configuration section ID, a network ID in the form `radio#.network#`
         * or a Linux network device name like `wlan0` which is resolved to the
         * corresponding configuration section through `ubus` runtime information.
         *
         * @returns {Promise<LuCI.Network.WifiNetwork>}
         * Returns a promise resolving to a `Network.WifiNetwork` instance
         * representing the wireless network and rejecting with `null` if
         * the given network could not be found or is not associated with
         * this radio device.
         */
        getWifiNetwork: function(network) {
                return L.network.getWifiNetwork(network).then(L.bind(function(networkInstance) {
                        var uciWifiIface = (networkInstance.sid ? uci.get('wireless', networkInstance.sid) : null);

                        if (uciWifiIface == null || uciWifiIface['.type'] != 'wifi-iface' || uciWifiIface.device != this.sid)
                                return Promise.reject();

                        return networkInstance;
                }, this));
        },

        /**
         * Get all wireless networks associated with this wireless radio device.
         *
         * @returns {Promise<Array<LuCI.Network.WifiNetwork>>}
         * Returns a promise resolving to an array of `Network.WifiNetwork`
         * instances respresenting the wireless networks associated with this
         * radio device.
         */
        getWifiNetworks: function() {
                var uciWifiIfaces = uci.sections('wireless', 'wifi-iface'),
                    tasks = [];

                for (var i = 0; i < uciWifiIfaces.length; i++)
                        if (uciWifiIfaces[i].device == this.sid)
                                tasks.push(L.network.getWifiNetwork(uciWifiIfaces[i]['.name']));

                return Promise.all(tasks);
        },

        /**
         * Adds a new wireless network associated with this radio device to the
         * configuration and sets its options to the provided values.
         *
         * @param {Object<string, string|string[]>} [options]
         * The options to set for the newly added wireless network.
         *
         * @returns {Promise<null|LuCI.Network.WifiNetwork>}
         * Returns a promise resolving to a `WifiNetwork` instance describing
         * the newly added wireless network or `null` if the given options
         * were invalid.
         */
        addWifiNetwork: function(options) {
                if (!L.isObject(options))
                        options = {};

                options.device = this.sid;

                return L.network.addWifiNetwork(options);
        },

        /**
         * Deletes the wireless network with the given name associated with this
         * radio device.
         *
         * @param {string} network
         * The name of the wireless network to lookup. This may be either an uci
         * configuration section ID, a network ID in the form `radio#.network#`
         * or a Linux network device name like `wlan0` which is resolved to the
         * corresponding configuration section through `ubus` runtime information.
         *
         * @returns {Promise<boolean>}
         * Returns a promise resolving to `true` when the wireless network was
         * successfully deleted from the configuration or `false` when the given
         * network could not be found or if the found network was not associated
         * with this wireless radio device.
         */
        deleteWifiNetwork: function(network) {
                var sid = null;

                if (network instanceof WifiNetwork) {
                        sid = network.sid;
                }
                else {
                        var uciWifiIface = uci.get('wireless', network);

                        if (uciWifiIface == null || uciWifiIface['.type'] != 'wifi-iface')
                                sid = getWifiSidByIfname(network);
                }

                if (sid == null || uci.get('wireless', sid, 'device') != this.sid)
                        return Promise.resolve(false);

                uci.delete('wireless', network);

                return Promise.resolve(true);
        }
});

/**
 * @class
 * @memberof LuCI.Network
 * @hideconstructor
 * @classdesc
 *
 * A `Network.WifiNetwork` instance represents a wireless network (vif)
 * configured on top of a radio device and provides functions for querying
 * the runtime state of the network. Most radio devices support multiple
 * such networks in parallel.
 */
WifiNetwork = L.Class.extend(/** @lends LuCI.Network.WifiNetwork.prototype */ {
        __init__: function(sid, radioname, radiostate, netid, netstate) {
                this.sid    = sid;
                this.netid  = netid;
                this._ubusdata = {
                        radio: radioname,
                        dev:   radiostate,
                        net:   netstate
                };
        },

        ubus: function(/* ... */) {
                var v = this._ubusdata;

                for (var i = 0; i < arguments.length; i++)
                        if (L.isObject(v))
                                v = v[arguments[i]];
                        else
                                return null;

                return v;
        },

        /**
         * Read the given UCI option value of this wireless network.
         *
         * @param {string} opt
         * The UCI option name to read.
         *
         * @returns {null|string|string[]}
         * Returns the UCI option value or `null` if the requested option is
         * not found.
         */
        get: function(opt) {
                return uci.get('wireless', this.sid, opt);
        },

        /**
         * Set the given UCI option of this network to the given value.
         *
         * @param {string} opt
         * The name of the UCI option to set.
         *
         * @param {null|string|string[]} val
         * The value to set or `null` to remove the given option from the
         * configuration.
         */
        set: function(opt, value) {
                return uci.set('wireless', this.sid, opt, value);
        },

        /**
         * Checks whether this wireless network is disabled.
         *
         * @returns {boolean}
         * Returns `true` when the wireless radio is marked as disabled in `ubus`
         * runtime state or when the `disabled` option is set in the corresponding
         * UCI configuration.
         */
        isDisabled: function() {
                return this.ubus('dev', 'disabled') || this.get('disabled') == '1';
        },

        /**
         * Get the configured operation mode of the wireless network.
         *
         * @returns {string}
         * Returns the configured operation mode. Possible values are:
         *  - `ap` - Master (Access Point) mode
         *  - `sta` - Station (client) mode
         *  - `adhoc` - Ad-Hoc (IBSS) mode
         *  - `mesh` - Mesh (IEEE 802.11s) mode
         *  - `monitor` - Monitor mode
         */
        getMode: function() {
                return this.ubus('net', 'config', 'mode') || this.get('mode') || 'ap';
        },

        /**
         * Get the configured SSID of the wireless network.
         *
         * @returns {null|string}
         * Returns the configured SSID value or `null` when this network is
         * in mesh mode.
         */
        getSSID: function() {
                if (this.getMode() == 'mesh')
                        return null;

                return this.ubus('net', 'config', 'ssid') || this.get('ssid');
        },

        /**
         * Get the configured Mesh ID of the wireless network.
         *
         * @returns {null|string}
         * Returns the configured mesh ID value or `null` when this network
         * is not in mesh mode.
         */
        getMeshID: function() {
                if (this.getMode() != 'mesh')
                        return null;

                return this.ubus('net', 'config', 'mesh_id') || this.get('mesh_id');
        },

        /**
         * Get the configured BSSID of the wireless network.
         *
         * @returns {null|string}
         * Returns the BSSID value or `null` if none has been specified.
         */
        getBSSID: function() {
                return this.ubus('net', 'config', 'bssid') || this.get('bssid');
        },

        /**
         * Get the names of the logical interfaces this wireless network is
         * attached to.
         *
         * @returns {string[]}
         * Returns an array of logical interface names.
         */
        getNetworkNames: function() {
                return L.toArray(this.ubus('net', 'config', 'network') || this.get('network'));
        },

        /**
         * Get the internal network ID of this wireless network.
         *
         * The network ID is a LuCI specific identifer in the form
         * `radio#.network#` to identify wireless networks by their corresponding
         * radio and network index numbers.
         *
         * @returns {string}
         * Returns the LuCI specific network ID.
         */
        getID: function() {
                return this.netid;
        },

        /**
         * Get the configuration ID of this wireless network.
         *
         * @returns {string}
         * Returns the corresponding UCI section ID of the network.
         */
        getName: function() {
                return this.sid;
        },

        /**
         * Get the Linux network device name.
         *
         * @returns {null|string}
         * Returns the current Linux network device name as resolved from
         * `ubus` runtime information or `null` if this network has no
         * associated network device, e.g. when not configured or up.
         */
        getIfname: function() {
                var ifname = this.ubus('net', 'ifname') || this.ubus('net', 'iwinfo', 'ifname');

                if (ifname == null || ifname.match(/^(wifi|radio)\d/))
                        ifname = this.netid;

                return ifname;
        },

        /**
         * Get the name of the corresponding wifi radio device.
         *
         * @returns {null|string}
         * Returns the name of the radio device this network is configured on
         * or `null` if it cannot be determined.
         */
        getWifiDeviceName: function() {
                return this.ubus('radio') || this.get('device');
        },

        /**
         * Get the corresponding wifi radio device.
         *
         * @returns {null|LuCI.Network.WifiDevice}
         * Returns a `Network.WifiDevice` instance representing the corresponding
         * wifi radio device or `null` if the related radio device could not be
         * found.
         */
        getWifiDevice: function() {
                var radioname = this.getWifiDeviceName();

                if (radioname == null)
                        return Promise.reject();

                return L.network.getWifiDevice(radioname);
        },

        /**
         * Check whether the radio network is up.
         *
         * This function actually queries the up state of the related radio
         * device and assumes this network to be up as well when the parent
         * radio is up. This is due to the fact that OpenWrt does not control
         * virtual interfaces individually but within one common hostapd
         * instance.
         *
         * @returns {boolean}
         * Returns `true` when the network is up, else `false`.
         */
        isUp: function() {
                var device = this.getDevice();

                if (device == null)
                        return false;

                return device.isUp();
        },

        /**
         * Query the current operation mode from runtime information.
         *
         * @returns {string}
         * Returns the human readable mode name as reported by `ubus` runtime
         * state. Possible returned values are:
         *  - `Master`
         *  - `Ad-Hoc`
         *  - `Client`
         *  - `Monitor`
         *  - `Master (VLAN)`
         *  - `WDS`
         *  - `Mesh Point`
         *  - `P2P Client`
         *  - `P2P Go`
         *  - `Unknown`
         */
        getActiveMode: function() {
                var mode = this.ubus('net', 'iwinfo', 'mode') || this.ubus('net', 'config', 'mode') || this.get('mode') || 'ap';

                switch (mode) {
                case 'ap':      return 'Master';
                case 'sta':     return 'Client';
                case 'adhoc':   return 'Ad-Hoc';
                case 'mesh':    return 'Mesh';
                case 'monitor': return 'Monitor';
                default:        return mode;
                }
        },

        /**
         * Query the current operation mode from runtime information as
         * translated string.
         *
         * @returns {string}
         * Returns the translated, human readable mode name as reported by
         *`ubus` runtime state.
         */
        getActiveModeI18n: function() {
                var mode = this.getActiveMode();

                switch (mode) {
                case 'Master':  return _('Master');
                case 'Client':  return _('Client');
                case 'Ad-Hoc':  return _('Ad-Hoc');
                case 'Mash':    return _('Mesh');
                case 'Monitor': return _('Monitor');
                default:        return mode;
                }
        },

        /**
         * Query the current SSID from runtime information.
         *
         * @returns {string}
         * Returns the current SSID or Mesh ID as reported by `ubus` runtime
         * information.
         */
        getActiveSSID: function() {
                return this.ubus('net', 'iwinfo', 'ssid') || this.ubus('net', 'config', 'ssid') || this.get('ssid');
        },

        /**
         * Query the current BSSID from runtime information.
         *
         * @returns {string}
         * Returns the current BSSID or Mesh ID as reported by `ubus` runtime
         * information.
         */
        getActiveBSSID: function() {
                return this.ubus('net', 'iwinfo', 'bssid') || this.ubus('net', 'config', 'bssid') || this.get('bssid');
        },

        /**
         * Query the current encryption settings from runtime information.
         *
         * @returns {string}
         * Returns a string describing the current encryption or `-` if the the
         * encryption state could not be found in `ubus` runtime information.
         */
        getActiveEncryption: function() {
                return formatWifiEncryption(this.ubus('net', 'iwinfo', 'encryption')) || '-';
        },

        /**
         * A wireless peer entry describes the properties of a remote wireless
         * peer associated with a local network.
         *
         * @typedef {Object<string, boolean|number|string|LuCI.Network.WifiRateEntry>} WifiPeerEntry
         * @memberof LuCI.Network
         *
         * @property {string} mac
         * The MAC address (BSSID).
         *
         * @property {number} signal
         * The received signal strength.
         *
         * @property {number} [signal_avg]
         * The average signal strength if supported by the driver.
         *
         * @property {number} [noise]
         * The current noise floor of the radio. May be `0` or absent if not
         * supported by the driver.
         *
         * @property {number} inactive
         * The amount of milliseconds the peer has been inactive, e.g. due
         * to powersave.
         *
         * @property {number} connected_time
         * The amount of milliseconds the peer is associated to this network.
         *
         * @property {number} [thr]
         * The estimated throughput of the peer, May be `0` or absent if not
         * supported by the driver.
         *
         * @property {boolean} authorized
         * Specifies whether the peer is authorized to associate to this network.
         *
         * @property {boolean} authenticated
         * Specifies whether the peer completed authentication to this network.
         *
         * @property {string} preamble
         * The preamble mode used by the peer. May be `long` or `short`.
         *
         * @property {boolean} wme
         * Specifies whether the peer supports WME/WMM capabilities.
         *
         * @property {boolean} mfp
         * Specifies whether management frame protection is active.
         *
         * @property {boolean} tdls
         * Specifies whether TDLS is active.
         *
         * @property {number} [mesh llid]
         * The mesh LLID, may be `0` or absent if not applicable or supported
         * by the driver.
         *
         * @property {number} [mesh plid]
         * The mesh PLID, may be `0` or absent if not applicable or supported
         * by the driver.
         *
         * @property {string} [mesh plink]
         * The mesh peer link state description, may be an empty string (`''`)
         * or absent if not applicable or supported by the driver.
         *
         * The following states are known:
         *  - `LISTEN`
         *  - `OPN_SNT`
         *  - `OPN_RCVD`
         *  - `CNF_RCVD`
         *  - `ESTAB`
         *  - `HOLDING`
         *  - `BLOCKED`
         *  - `UNKNOWN`
         *
         * @property {number} [mesh local PS]
         * The local powersafe mode for the peer link, may be an empty
         * string (`''`) or absent if not applicable or supported by
         * the driver.
         *
         * The following modes are known:
         *  - `ACTIVE` (no power save)
         *  - `LIGHT SLEEP`
         *  - `DEEP SLEEP`
         *  - `UNKNOWN`
         *
         * @property {number} [mesh peer PS]
         * The remote powersafe mode for the peer link, may be an empty
         * string (`''`) or absent if not applicable or supported by
         * the driver.
         *
         * The following modes are known:
         *  - `ACTIVE` (no power save)
         *  - `LIGHT SLEEP`
         *  - `DEEP SLEEP`
         *  - `UNKNOWN`
         *
         * @property {number} [mesh non-peer PS]
         * The powersafe mode for all non-peer neigbours, may be an empty
         * string (`''`) or absent if not applicable or supported by the driver.
         *
         * The following modes are known:
         *  - `ACTIVE` (no power save)
         *  - `LIGHT SLEEP`
         *  - `DEEP SLEEP`
         *  - `UNKNOWN`
         *
         * @property {LuCI.Network.WifiRateEntry} rx
         * Describes the receiving wireless rate from the peer.
         *
         * @property {LuCI.Network.WifiRateEntry} tx
         * Describes the transmitting wireless rate to the peer.
         */

        /**
         * A wireless rate entry describes the properties of a wireless
         * transmission rate to or from a peer.
         *
         * @typedef {Object<string, boolean|number>} WifiRateEntry
         * @memberof LuCI.Network
         *
         * @property {number} [drop_misc]
         * The amount of received misc. packages that have been dropped, e.g.
         * due to corruption or missing authentication. Only applicable to
         * receiving rates.
         *
         * @property {number} packets
         * The amount of packets that have been received or sent.
         *
         * @property {number} bytes
         * The amount of bytes that have been received or sent.
         *
         * @property {number} [failed]
         * The amount of failed tranmission attempts. Only applicable to
         * transmit rates.
         *
         * @property {number} [retries]
         * The amount of retried transmissions. Only applicable to transmit
         * rates.
         *
         * @property {boolean} is_ht
         * Specifies whether this rate is an HT (IEEE 802.11n) rate.
         *
         * @property {boolean} is_vht
         * Specifies whether this rate is an VHT (IEEE 802.11ac) rate.
         *
         * @property {number} mhz
         * The channel width in MHz used for the transmission.
         *
         * @property {number} rate
         * The bitrate in bit/s of the transmission.
         *
         * @property {number} [mcs]
         * The MCS index of the used transmission rate. Only applicable to
         * HT or VHT rates.
         *
         * @property {number} [40mhz]
         * Specifies whether the tranmission rate used 40MHz wide channel.
         * Only applicable to HT or VHT rates.
         *
         * Note: this option exists for backwards compatibility only and its
         * use is discouraged. The `mhz` field should be used instead to
         * determine the channel width.
         *
         * @property {boolean} [short_gi]
         * Specifies whether a short guard interval is used for the transmission.
         * Only applicable to HT or VHT rates.
         *
         * @property {number} [nss]
         * Specifies the number of spatial streams used by the transmission.
         * Only applicable to VHT rates.
         */

        /**
         * Fetch the list of associated peers.
         *
         * @returns {Promise<Array<LuCI.Network.WifiPeerEntry>>}
         * Returns a promise resolving to an array of wireless peers associated
         * with this network.
         */
        getAssocList: function() {
                return callIwinfoAssoclist(this.getIfname());
        },

        /**
         * Query the current operating frequency of the wireless network.
         *
         * @returns {null|string}
         * Returns the current operating frequency of the network from `ubus`
         * runtime information in GHz or `null` if the information is not
         * available.
         */
        getFrequency: function() {
                var freq = this.ubus('net', 'iwinfo', 'frequency');

                if (freq != null && freq > 0)
                        return '%.03f'.format(freq / 1000);

                return null;
        },

        /**
         * Query the current average bitrate of all peers associated to this
         * wireless network.
         *
         * @returns {null|number}
         * Returns the average bit rate among all peers associated to the network
         * as reported by `ubus` runtime information or `null` if the information
         * is not available.
         */
        getBitRate: function() {
                var rate = this.ubus('net', 'iwinfo', 'bitrate');

                if (rate != null && rate > 0)
                        return (rate / 1000);

                return null;
        },

        /**
         * Query the current wireless channel.
         *
         * @returns {null|number}
         * Returns the wireless channel as reported by `ubus` runtime information
         * or `null` if it cannot be determined.
         */
        getChannel: function() {
                return this.ubus('net', 'iwinfo', 'channel') || this.ubus('dev', 'config', 'channel') || this.get('channel');
        },

        /**
         * Query the current wireless signal.
         *
         * @returns {null|number}
         * Returns the wireless signal in dBm as reported by `ubus` runtime
         * information or `null` if it cannot be determined.
         */
        getSignal: function() {
                return this.ubus('net', 'iwinfo', 'signal') || 0;
        },

        /**
         * Query the current radio noise floor.
         *
         * @returns {number}
         * Returns the radio noise floor in dBm as reported by `ubus` runtime
         * information or `0` if it cannot be determined.
         */
        getNoise: function() {
                return this.ubus('net', 'iwinfo', 'noise') || 0;
        },

        /**
         * Query the current country code.
         *
         * @returns {string}
         * Returns the wireless country code as reported by `ubus` runtime
         * information or `00` if it cannot be determined.
         */
        getCountryCode: function() {
                return this.ubus('net', 'iwinfo', 'country') || this.ubus('dev', 'config', 'country') || '00';
        },

        /**
         * Query the current radio TX power.
         *
         * @returns {null|number}
         * Returns the wireless network transmit power in dBm as reported by
         * `ubus` runtime information or `null` if it cannot be determined.
         */
        getTXPower: function() {
                return this.ubus('net', 'iwinfo', 'txpower');
        },

        /**
         * Query the radio TX power offset.
         *
         * Some wireless radios have a fixed power offset, e.g. due to the
         * use of external amplifiers.
         *
         * @returns {number}
         * Returns the wireless network transmit power offset in dBm as reported
         * by `ubus` runtime information or `0` if there is no offset, or if it
         * cannot be determined.
         */
        getTXPowerOffset: function() {
                return this.ubus('net', 'iwinfo', 'txpower_offset') || 0;
        },

        /**
         * Calculate the current signal.
         *
         * @deprecated
         * @returns {number}
         * Returns the calculated signal level, which is the difference between
         * noise and signal (SNR), divided by 5.
         */
        getSignalLevel: function(signal, noise) {
                if (this.getActiveBSSID() == '00:00:00:00:00:00')
                        return -1;

                signal = signal || this.getSignal();
                noise  = noise  || this.getNoise();

                if (signal < 0 && noise < 0) {
                        var snr = -1 * (noise - signal);
                        return Math.floor(snr / 5);
                }

                return 0;
        },

        /**
         * Calculate the current signal quality percentage.
         *
         * @returns {number}
         * Returns the calculated signal quality in percent. The value is
         * calculated from the `quality` and `quality_max` indicators reported
         * by `ubus` runtime state.
         */
        getSignalPercent: function() {
                var qc = this.ubus('net', 'iwinfo', 'quality') || 0,
                    qm = this.ubus('net', 'iwinfo', 'quality_max') || 0;

                if (qc > 0 && qm > 0)
                        return Math.floor((100 / qm) * qc);

                return 0;
        },

        /**
         * Get a short description string for this wireless network.
         *
         * @returns {string}
         * Returns a string describing this network, consisting of the
         * active operation mode, followed by either the SSID, BSSID or
         * internal network ID, depending on which information is available.
         */
        getShortName: function() {
                return '%s "%s"'.format(
                        this.getActiveModeI18n(),
                        this.getActiveSSID() || this.getActiveBSSID() || this.getID());
        },

        /**
         * Get a description string for this wireless network.
         *
         * @returns {string}
         * Returns a string describing this network, consisting of the
         * term `Wireless Network`, followed by the active operation mode,
         * the SSID, BSSID or internal network ID and the Linux network device
         * name, depending on which information is available.
         */
        getI18n: function() {
                return '%s: %s "%s" (%s)'.format(
                        _('Wireless Network'),
                        this.getActiveModeI18n(),
                        this.getActiveSSID() || this.getActiveBSSID() || this.getID(),
                        this.getIfname());
        },

        /**
         * Get the primary logical interface this wireless network is attached to.
         *
         * @returns {null|LuCI.Network.Protocol}
         * Returns a `Network.Protocol` instance representing the logical
         * interface or `null` if this network is not attached to any logical
         * interface.
         */
        getNetwork: function() {
                return this.getNetworks()[0];
        },

        /**
         * Get the logical interfaces this wireless network is attached to.
         *
         * @returns {Array<LuCI.Network.Protocol>}
         * Returns an array of `Network.Protocol` instances representing the
         * logical interfaces this wireless network is attached to.
         */
        getNetworks: function() {
                var networkNames = this.getNetworkNames(),
                    networks = [];

                for (var i = 0; i < networkNames.length; i++) {
                        var uciInterface = uci.get('network', networkNames[i]);

                        if (uciInterface == null || uciInterface['.type'] != 'interface')
                                continue;

                        networks.push(L.network.instantiateNetwork(networkNames[i]));
                }

                networks.sort(networkSort);

                return networks;
        },

        /**
         * Get the associated Linux network device.
         *
         * @returns {LuCI.Network.Device}
         * Returns a `Network.Device` instance representing the Linux network
         * device associted with this wireless network.
         */
        getDevice: function() {
                return L.network.instantiateDevice(this.getIfname());
        }
});

return Network;