[project/luci.git] / libs / core / luasrc / model / network.lua

--[[
LuCI - Network model

Copyright 2009-2010 Jo-Philipp Wich <xm@subsignal.org>

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

]]--

local type, pairs, ipairs, loadfile, table, tonumber, math, i18n
        = type, pairs, ipairs, loadfile, table, tonumber, math, luci.i18n

local nxo = require "nixio"
local ipc = require "luci.ip"
local sys = require "luci.sys"
local utl = require "luci.util"
local dsp = require "luci.dispatcher"
local uci = require "luci.model.uci"

module "luci.model.network"


local ifs, brs, sws, uci_r, uci_s

function _list_del(c, s, o, r)
        local val = uci_r:get(c, s, o)
        if val then
                local l = { }
                if type(val) == "string" then
                        for val in val:gmatch("%S+") do
                                if val ~= r then
                                        l[#l+1] = val
                                end
                        end
                        if #l > 0 then
                                uci_r:set(c, s, o, table.concat(l, " "))
                        else
                                uci_r:delete(c, s, o)
                        end
                elseif type(val) == "table" then
                        for _, val in ipairs(val) do
                                if val ~= r then
                                        l[#l+1] = val
                                end
                        end
                        if #l > 0 then
                                uci_r:set(c, s, o, l)
                        else
                                uci_r:delete(c, s, o)
                        end
                end
        end
end

function _list_add(c, s, o, a)
        local val = uci_r:get(c, s, o) or ""
        if type(val) == "string" then
                local l = { }
                for val in val:gmatch("%S+") do
                        if val ~= a then
                                l[#l+1] = val
                        end
                end
                l[#l+1] = a
                uci_r:set(c, s, o, table.concat(l, " "))
        elseif type(val) == "table" then
                local l = { }
                for _, val in ipairs(val) do
                        if val ~= a then
                                l[#l+1] = val
                        end
                end
                l[#l+1] = a
                uci_r:set(c, s, o, l)
        end
end

function _stror(s1, s2)
        if not s1 or #s1 == 0 then
                return s2 and #s2 > 0 and s2
        else
                return s1
        end
end

function _get(c, s, o)
        return uci_r:get(c, s, o)
end

function _set(c, s, o, v)
        if v ~= nil then
                if type(v) == "boolean" then v = v and "1" or "0" end
                return uci_r:set(c, s, o, v)
        else
                return uci_r:delete(c, s, o)
        end
end

function _wifi_iface(x)
        return (
                x:match("^wlan%d") or x:match("^wl%d") or x:match("^ath%d") or
                x:match("^%w+%.network%d")
        )
end

function _wifi_lookup(ifn)
        -- got a radio#.network# pseudo iface, locate the corresponding section
        local radio, ifnidx = ifn:match("^(%w+)%.network(%d+)$")
        if radio and ifnidx then
                local sid = nil
                local num = 0

                ifnidx = tonumber(ifnidx)
                uci_r:foreach("wireless", "wifi-iface",
                        function(s)
                                if s.device == radio then
                                        num = num + 1
                                        if num == ifnidx then
                                                sid = s['.name']
                                                return false
                                        end
                                end
                        end)

                return sid

        -- looks like wifi, try to locate the section via state vars
        elseif _wifi_iface(ifn) then
                local sid = nil

                uci_s:foreach("wireless", "wifi-iface",
                        function(s)
                                if s.ifname == ifn then
                                        sid = s['.name']
                                        return false
                                end
                        end)

                return sid
        end
end

function _iface_ignore(x)
        return (
                x:match("^wmaster%d") or x:match("^wifi%d") or x:match("^hwsim%d") or
                x:match("^imq%d") or x:match("^mon.wlan%d") or x:match("^6in4-%w") or
                x:match("^3g-%w") or x:match("^ppp-%w") or x:match("^pppoe-%w") or
                x:match("^pppoa-%w") or x == "lo"
        )
end


function init(cursor)
        uci_r = cursor or uci_r or uci.cursor()
        uci_s = uci_r:substate()

        ifs = { }
        brs = { }
        sws = { }

        -- read interface information
        local n, i
        for n, i in ipairs(nxo.getifaddrs()) do
                local name = i.name:match("[^:]+")
                local prnt = name:match("^([^%.]+)%.")

                if not _iface_ignore(name) then
                        ifs[name] = ifs[name] or {
                                idx      = i.ifindex or n,
                                name     = name,
                                rawname  = i.name,
                                flags    = { },
                                ipaddrs  = { },
                                ip6addrs = { }
                        }

                        if prnt then
                                sws[name] = true
                                sws[prnt] = true
                        end

                        if i.family == "packet" then
                                ifs[name].flags   = i.flags
                                ifs[name].stats   = i.data
                                ifs[name].macaddr = i.addr
                        elseif i.family == "inet" then
                                ifs[name].ipaddrs[#ifs[name].ipaddrs+1] = ipc.IPv4(i.addr, i.netmask)
                        elseif i.family == "inet6" then
                                ifs[name].ip6addrs[#ifs[name].ip6addrs+1] = ipc.IPv6(i.addr, i.netmask)
                        end
                end
        end

        -- read bridge informaton
        local b, l
        for l in utl.execi("brctl show") do
                if not l:match("STP") then
                        local r = utl.split(l, "%s+", nil, true)
                        if #r == 4 then
                                b = {
                                        name    = r[1],
                                        id      = r[2],
                                        stp     = r[3] == "yes",
                                        ifnames = { ifs[r[4]] }
                                }
                                if b.ifnames[1] then
                                        b.ifnames[1].bridge = b
                                end
                                brs[r[1]] = b
                        elseif b then
                                b.ifnames[#b.ifnames+1] = ifs[r[2]]
                                b.ifnames[#b.ifnames].bridge = b
                        end
                end
        end

        return _M
end

function save(self, ...)
        uci_r:save(...)
        uci_r:load(...)
end

function commit(self, ...)
        uci_r:commit(...)
        uci_r:load(...)
end

function has_ipv6(self)
        return nfs.access("/proc/net/ipv6_route")
end

function add_network(self, n, options)
        if n and #n > 0 and n:match("^[a-zA-Z0-9_]+$") and not self:get_network(n) then
                if uci_r:section("network", "interface", n, options) then
                        return network(n)
                end
        end
end

function get_network(self, n)
        if n and uci_r:get("network", n) == "interface" then
                return network(n)
        end
end

function get_networks(self)
        local nets = { }
        local nls = { }

        uci_r:foreach("network", "interface",
                function(s)
                        nls[s['.name']] = network(s['.name'])
                end)

        local n
        for n in utl.kspairs(nls) do
                nets[#nets+1] = nls[n]
        end

        return nets
end

function del_network(self, n)
        local r = uci_r:delete("network", n)
        if r then
                uci_r:foreach("network", "alias",
                        function(s)
                                if s.interface == n then
                                        uci_r:delete("network", s['.name'])
                                end
                        end)

                uci_r:foreach("network", "route",
                        function(s)
                                if s.interface == n then
                                        uci_r:delete("network", s['.name'])
                                end
                        end)

                uci_r:foreach("network", "route6",
                        function(s)
                                if s.interface == n then
                                        uci_r:delete("network", s['.name'])
                                end
                        end)

                uci_r:foreach("wireless", "wifi-iface",
                        function(s)
                                if s.network == n then
                                        uci_r:delete("wireless", s['.name'], "network")
                                end
                        end)

                uci_r:delete("network", n)
        end
        return r
end

function rename_network(self, old, new)
        local r
        if new and #new > 0 and new:match("^[a-zA-Z0-9_]+$") and not self:get_network(new) then
                r = uci_r:section("network", "interface", new, uci_r:get_all("network", old))

                if r then
                        uci_r:foreach("network", "alias",
                                function(s)
                                        if s.interface == old then
                                                uci_r:set("network", s['.name'], "interface", new)
                                        end
                                end)

                        uci_r:foreach("network", "route",
                                function(s)
                                        if s.interface == old then
                                                uci_r:set("network", s['.name'], "interface", new)
                                        end
                                end)

                        uci_r:foreach("network", "route6",
                                function(s)
                                        if s.interface == old then
                                                uci_r:set("network", s['.name'], "interface", new)
                                        end
                                end)

                        uci_r:foreach("wireless", "wifi-iface",
                                function(s)
                                        if s.network == old then
                                                uci_r:set("wireless", s['.name'], "network", new)
                                        end
                                end)

                        uci_r:delete("network", old)
                end
        end
        return r or false
end

function get_interface(self, i)
        if ifs[i] or _wifi_iface(i) then
                return interface(i)
        else
                local ifc
                local num = { }
                uci_r:foreach("wireless", "wifi-iface",
                        function(s)
                                if s.device then
                                        num[s.device] = num[s.device] and num[s.device] + 1 or 1
                                        if s['.name'] == i then
                                                ifc = interface(
                                                        "%s.network%d" %{s.device, num[s.device] })
                                                return false
                                        end
                                end
                        end)
                return ifc
        end
end

function get_interfaces(self)
        local iface
        local ifaces = { }
        local seen = { }

        -- find normal interfaces
        uci_r:foreach("network", "interface",
                function(s)
                        for iface in utl.imatch(s.ifname) do
                                if not _iface_ignore(iface) and not _wifi_iface(iface) then
                                        seen[iface] = true
                                        ifaces[#ifaces+1] = interface(iface)
                                end
                        end
                end)

        for iface in utl.kspairs(ifs) do
                if not (seen[iface] or _iface_ignore(iface) or _wifi_iface(iface)) then
                        ifaces[#ifaces+1] = interface(iface)
                end
        end

        -- find wifi interfaces
        local num = { }
        local wfs = { }
        uci_r:foreach("wireless", "wifi-iface",
                function(s)
                        if s.device then
                                num[s.device] = num[s.device] and num[s.device] + 1 or 1
                                local i = "%s.network%d" %{ s.device, num[s.device] }
                                wfs[i] = interface(i)
                        end
                end)

        for iface in utl.kspairs(wfs) do
                ifaces[#ifaces+1] = wfs[iface]
        end

        return ifaces
end

function ignore_interface(self, x)
        return _iface_ignore(x)
end

function get_wifidev(self, dev)
        if uci_r:get("wireless", dev) == "wifi-device" then
                return wifidev(dev)
        end
end

function get_wifidevs(self)
        local devs = { }
        local wfd  = { }

        uci_r:foreach("wireless", "wifi-device",
                function(s) wfd[#wfd+1] = s['.name'] end)

        local dev
        for _, dev in utl.vspairs(wfd) do
                devs[#devs+1] = wifidev(dev)
        end

        return devs
end

function get_wifinet(self, net)
        local wnet = _wifi_lookup(net)
        if wnet then
                return wifinet(wnet)
        end
end

function add_wifinet(self, net, options)
        if type(options) == "table" and options.device and
                uci_r:get("wireless", options.device) == "wifi-device"
        then
                local wnet = uci_r:section("wireless", "wifi-iface", nil, options)
                return wifinet(wnet)
        end
end

function del_wifinet(self, net)
        local wnet = _wifi_lookup(net)
        if wnet then
                uci_r:delete("wireless", wnet)
                return true
        end
        return false
end


network = utl.class()

function network.__init__(self, name)
        self.sid = name
end

function network._get(self, opt)
        local v = uci_r:get("network", self.sid, opt)
        if type(v) == "table" then
                return table.concat(v, " ")
        end
        return v or ""
end

function network.get(self, opt)
        return _get("network", self.sid, opt)
end

function network.set(self, opt, val)
        return _set("network", self.sid, opt, val)
end

function network.ifname(self)
        local p = self:proto()
        if self:is_bridge() then
                return "br-" .. self.sid
        elseif self:is_virtual() then
                return p .. "-" .. self.sid
        else
                local dev = self:_get("ifname") or
                        uci_r:get("network", self.sid, "ifname")

                dev = dev and dev:match("%S+")

                if not dev then
                        uci_r:foreach("wireless", "wifi-iface",
                                function(s)
                                        if s.device then
                                                num[s.device] = num[s.device]
                                                        and num[s.device] + 1 or 1

                                                if s.network == self.sid then
                                                        dev = "%s.network%d" %{ s.device, num[s.device] }
                                                        return false
                                                end
                                        end
                                end)
                end

                return dev
        end
end

function network.device(self)
        local dev = self:_get("device")
        if not dev or dev:match("[^%w%-%.%s]") then
                dev = uci_r:get("network", self.sid, "ifname")
        end
        return dev
end

function network.proto(self)
        return self:_get("proto") or "none"
end

function network.type(self)
        return self:_get("type")
end

function network.name(self)
        return self.sid
end

function network.is_bridge(self)
        return (self:type() == "bridge")
end

function network.is_virtual(self)
        local p = self:proto()
        return (
                p == "3g" or p == "6in4" or p == "ppp" or
                p == "pppoe" or p == "pppoa"
        )
end

function network.is_empty(self)
        if self:is_virtual() then
                return false
        else
                local rv = true

                if (self:_get("ifname") or ""):match("%S+") then
                        rv = false
                end

                uci_r:foreach("wireless", "wifi-iface",
                        function(s)
                                if s.network == self.sid then
                                        rv = false
                                        return false
                                end
                        end)

                return rv
        end
end

function network.add_interface(self, ifname)
        if not self:is_virtual() then
                if type(ifname) ~= "string" then
                        ifname = ifname:name()
                else
                        ifname = ifname:match("[^%s:]+")
                end

                -- remove the interface from all ifaces
                uci_r:foreach("network", "interface",
                        function(s)
                                _list_del("network", s['.name'], "ifname", ifname)
                        end)

                -- if its a wifi interface, change its network option
                local wif = _wifi_lookup(ifname)
                if wif then
                        uci_r:set("wireless", wif, "network", self.sid)

                -- add iface to our iface list
                else
                        _list_add("network", self.sid, "ifname", ifname)
                end
        end
end

function network.del_interface(self, ifname)
        if not self:is_virtual() then
                if utl.instanceof(ifname, interface) then
                        ifname = ifname:name()
                else
                        ifname = ifname:match("[^%s:]+")
                end

                -- if its a wireless interface, clear its network option
                local wif = _wifi_lookup(ifname)
                if wif then     uci_r:delete("wireless", wif, "network") end

                -- remove the interface
                _list_del("network", self.sid, "ifname", ifname)
        end
end

function network.get_interfaces(self)
        local ifaces = { }

        local ifn
        if self:is_virtual() then
                ifn = self:proto() .. "-" .. self.sid
                ifaces = { interface(ifn) }
        else
                local nfs = { }
                for ifn in utl.imatch(self:get("ifname")) do
                        ifn = ifn:match("[^:]+")
                        nfs[ifn] = interface(ifn)
                end

                for ifn in utl.kspairs(nfs) do
                        ifaces[#ifaces+1] = nfs[ifn]
                end

                local num = { }
                local wfs = { }
                uci_r:foreach("wireless", "wifi-iface",
                        function(s)
                                if s.device then
                                        num[s.device] = num[s.device] and num[s.device] + 1 or 1
                                        if s.network == self.sid then
                                                ifn = "%s.network%d" %{ s.device, num[s.device] }
                                                wfs[ifn] = interface(ifn)
                                        end
                                end
                        end)

                for ifn in utl.kspairs(wfs) do
                        ifaces[#ifaces+1] = wfs[ifn]
                end
        end

        return ifaces
end

function network.contains_interface(self, ifname)
        if type(ifname) ~= "string" then
                ifname = ifname:name()
        else
                ifname = ifname:match("[^%s:]+")
        end

        local ifn
        if self:is_virtual() then
                ifn = self:proto() .. "-" .. self.sid
                return ifname == ifn
        else
                for ifn in utl.imatch(self:get("ifname")) do
                        ifn = ifn:match("[^:]+")
                        if ifn == ifname then
                                return true
                        end
                end

                local wif = _wifi_lookup(ifname)
                if wif then
                        return (uci_r:get("wireless", wif, "network") == self.sid)
                end
        end

        return false
end

function network.adminlink(self)
        return dsp.build_url("admin", "network", "network", self.sid)
end


interface = utl.class()
function interface.__init__(self, ifname)
        local wif = _wifi_lookup(ifname)
        if wif then self.wif = wifinet(wif) end

        self.ifname = self.ifname or ifname
        self.dev    = ifs[self.ifname]
end

function interface.name(self)
        return self.wif and self.wif:ifname() or self.ifname
end

function interface.mac(self)
        return self.dev and self.dev.macaddr or "00:00:00:00:00:00"
end

function interface.ipaddrs(self)
        return self.dev and self.dev.ipaddrs or { }
end

function interface.ip6addrs(self)
        return self.dev and self.dev.ip6addrs or { }
end

function interface.type(self)
        if self.wif or _wifi_iface(self.ifname) then
                return "wifi"
        elseif brs[self.ifname] then
                return "bridge"
        elseif sws[self.ifname] or self.ifname:match("%.") then
                return "switch"
        else
                return "ethernet"
        end
end

function interface.shortname(self)
        if self.wif then
                return "%s %q" %{
                        self.wif:active_mode(),
                        self.wif:active_ssid() or self.wif:active_bssid()
                }
        else
                return self.ifname
        end
end

function interface.get_i18n(self)
        if self.wif then
                return "%s: %s %q" %{
                        i18n.translate("Wireless Network"),
                        self.wif:active_mode(),
                        self.wif:active_ssid() or self.wif:active_bssid()
                }
        else
                return "%s: %q" %{ self:get_type_i18n(), self:name() }
        end
end

function interface.get_type_i18n(self)
        local x = self:type()
        if x == "wifi" then
                return i18n.translate("Wireless Adapter")
        elseif x == "bridge" then
                return i18n.translate("Bridge")
        elseif x == "switch" then
                return i18n.translate("Ethernet Switch")
        else
                return i18n.translate("Ethernet Adapter")
        end
end

function interface.adminlink(self)
        if self.wif then
                return self.wif:adminlink()
        end
end

function interface.ports(self)
        if self.br then
                local iface
                local ifaces = { }
                for _, iface in ipairs(self.br.ifnames) do
                        ifaces[#ifaces+1] = interface(iface.name)
                end
                return ifaces
        end
end

function interface.bridge_id(self)
        if self.br then
                return self.br.id
        else
                return nil
        end
end

function interface.bridge_stp(self)
        if self.br then
                return self.br.stp
        else
                return false
        end
end

function interface.is_up(self)
        if self.wif then
                return self.wif:is_up()
        else
                return self.dev and self.dev.flags and self.dev.flags.up or false
        end
end

function interface.is_bridge(self)
        return (self:type() == "bridge")
end

function interface.is_bridgeport(self)
        return self.dev and self.dev.bridge and true or false
end

function interface.tx_bytes(self)
        return self.dev and self.dev.stats
                and self.dev.stats.tx_bytes or 0
end

function interface.rx_bytes(self)
        return self.dev and self.dev.stats
                and self.dev.stats.rx_bytes or 0
end

function interface.tx_packets(self)
        return self.dev and self.dev.stats
                and self.dev.stats.tx_packets or 0
end

function interface.rx_packets(self)
        return self.dev and self.dev.stats
                and self.dev.stats.rx_packets or 0
end

function interface.get_network(self)
        if self.dev and self.dev.network then
                self.network = _M:get_network(self.dev.network)
        end

        if not self.network then
                local net
                for _, net in ipairs(_M:get_networks()) do
                        if net:contains_interface(self.ifname) then
                                self.network = net
                                return net
                        end
                end
        else
                return self.network
        end
end

function interface.get_wifinet(self)
        return self.wif
end


wifidev = utl.class()
function wifidev.__init__(self, dev)
        self.sid = dev
end

function wifidev.get(self, opt)
        return _get("wireless", self.sid, opt)
end

function wifidev.set(self, opt, val)
        return _set("wireless", self.sid, opt, val)
end

function wifidev.name(self)
        return self.sid
end

function wifidev.is_up(self)
        local up = false

        uci_s:foreach("wireless", "wifi-iface",
                function(s)
                        if s.device == self.sid then
                                if s.up == "1" then
                                        up = true
                                        return false
                                end
                        end
                end)

        return up
end

function wifidev.get_wifinet(self, net)
        if uci_r:get("wireless", net) == "wifi-iface" then
                return wifinet(net)
        else
                local wnet = _wifi_lookup(net)
                if wnet then
                        return wifinet(wnet)
                end
        end
end

function wifidev.get_wifinets(self)
        local nets = { }

        uci_r:foreach("wireless", "wifi-iface",
                function(s)
                        if s.device == self.sid then
                                nets[#nets+1] = wifinet(s['.name'])
                        end
                end)

        return nets
end

function wifidev.add_wifinet(self, options)
        options = options or { }
        options.device = self.sid

        local wnet = uci_r:section("wireless", "wifi-iface", nil, options)
        if wnet then
                return wifinet(wnet, options)
        end
end

function wifidev.del_wifinet(self, net)
        if utl.instanceof(net, wifinet) then
                net = net.sid
        elseif uci_r:get("wireless", net) ~= "wifi-iface" then
                net = _wifi_lookup(net)
        end

        if net and uci_r:get("wireless", net, "device") == self.sid then
                uci_r:delete("wireless", net)
                return true
        end

        return false
end


wifinet = utl.class()
function wifinet.__init__(self, net, data)
        self.sid = net

        local dev = uci_s:get("wireless", self.sid, "ifname")
        if not dev then
                local num = { }
                uci_r:foreach("wireless", "wifi-iface",
                        function(s)
                                if s.device then
                                        num[s.device] = num[s.device] and num[s.device] + 1 or 1
                                        if s['.name'] == self.sid then
                                                dev = "%s.network%d" %{ s.device, num[s.device] }
                                                return false
                                        end
                                end
                        end)
        end

        self.wdev   = dev
        self.iwinfo = dev and sys.wifi.getiwinfo(dev) or { }
        self.iwdata = data or uci_s:get_all("wireless", self.sid) or
                uci_r:get_all("wireless", self.sid) or { }
end

function wifinet.get(self, opt)
        return _get("wireless", self.sid, opt)
end

function wifinet.set(self, opt, val)
        return _set("wireless", self.sid, opt, val)
end

function wifinet.mode(self)
        return uci_s:get("wireless", self.sid, "mode") or "ap"
end

function wifinet.ssid(self)
        return uci_s:get("wireless", self.sid, "ssid")
end

function wifinet.bssid(self)
        return uci_s:get("wireless", self.sid, "bssid")
end

function wifinet.network(self)
        return uci_s:get("wifinet", self.sid, "network")
end

function wifinet.name(self)
        return self.sid
end

function wifinet.ifname(self)
        return self.iwinfo.ifname or self.wdev
end

function wifinet.get_device(self)
        if self.iwdata.device then
                return wifidev(self.iwdata.device)
        end
end

function wifinet.is_up(self)
        return (self.iwdata.up == "1")
end

function wifinet.active_mode(self)
        local m = _stror(self.iwinfo.mode, self.iwdata.mode) or "ap"

        if     m == "ap"      then m = "AP"
        elseif m == "sta"     then m = "Client"
        elseif m == "adhoc"   then m = "Ad-Hoc"
        elseif m == "mesh"    then m = "Mesh"
        elseif m == "monitor" then m = "Monitor"
        end

        return m
end

function wifinet.active_mode_i18n(self)
        return i18n.translate(self:active_mode())
end

function wifinet.active_ssid(self)
        return _stror(self.iwinfo.ssid, self.iwdata.ssid)
end

function wifinet.active_bssid(self)
        return _stror(self.iwinfo.bssid, self.iwdata.bssid) or "00:00:00:00:00:00"
end

function wifinet.active_encryption(self)
        local enc = self.iwinfo and self.iwinfo.encryption
        return enc and enc.description or "-"
end

function wifinet.assoclist(self)
        return self.iwinfo.assoclist or { }
end

function wifinet.frequency(self)
        local freq = self.iwinfo.frequency
        if freq and freq > 0 then
                return "%.03f" % (freq / 1000)
        end
end

function wifinet.bitrate(self)
        local rate = self.iwinfo.bitrate
        if rate and rate > 0 then
                return (rate / 1000)
        end
end

function wifinet.channel(self)
        return self.iwinfo.channel or
                tonumber(uci_s:get("wireless", self.iwdata.device, "channel"))
end

function wifinet.signal(self)
        return self.iwinfo.signal or 0
end

function wifinet.noise(self)
        return self.iwinfo.noise or 0
end

function wifinet.signal_level(self, s, n)
        if self:active_bssid() ~= "00:00:00:00:00:00" then
                local signal = s or self:signal()
                local noise  = n or self:noise()

                if signal < 0 and noise < 0 then
                        local snr = -1 * (noise - signal)
                        return math.floor(snr / 5)
                else
                        return 0
                end
        else
                return -1
        end
end

function wifinet.signal_percent(self)
        local qc = self.iwinfo.quality or 0
        local qm = self.iwinfo.quality_max or 0

        if qc > 0 and qm > 0 then
                return math.floor((100 / qm) * qc)
        else
                return 0
        end
end

function wifinet.shortname(self)
        return "%s %q" %{
                i18n.translate(self:active_mode()),
                self:active_ssid() or self:active_bssid()
        }
end

function wifinet.get_i18n(self)
        return "%s: %s %q (%s)" %{
                i18n.translate("Wireless Network"),
                i18n.translate(self:active_mode()),
                self:active_ssid() or self:active_bssid(),
                self:ifname()
        }
end

function wifinet.adminlink(self)
        return dsp.build_url("admin", "network", "wireless",
                self.iwdata.device, self.wdev)
end

function wifinet.get_network(self)
        if uci_r:get("network", self.iwdata.network) == "interface" then
                return network(self.iwdata.network)
        end
end

function wifinet.get_interface(self)
        return interface(self:ifname())
end