From f9b8d7ff7bbd3c82f9889b65af07a28d94d9fed7 Mon Sep 17 00:00:00 2001
From: Jo-Philipp Wich <jo@mein.io>
Date: Tue, 2 Jan 2018 00:24:10 +0100
Subject: [PATCH] luci-base: rework wireless state handling (#1179)

 - fix mapping of ubus wireless state to uci declared vifs
 - fix leaking foreign vif info into per-phy iwinfo stats

Signed-off-by: Jo-Philipp Wich <jo@mein.io>
---
 modules/luci-base/luasrc/model/network.lua | 367 +++++++++++++++++------------
 modules/luci-base/luasrc/sys.lua           |  35 +--
 2 files changed, 218 insertions(+), 184 deletions(-)

diff --git a/modules/luci-base/luasrc/model/network.lua b/modules/luci-base/luasrc/model/network.lua
index d9ef4089c..48a03393e 100644
--- a/modules/luci-base/luasrc/model/network.lua
+++ b/modules/luci-base/luasrc/model/network.lua
@@ -6,14 +6,12 @@ local type, next, pairs, ipairs, loadfile, table, select
 
 local tonumber, tostring, math = tonumber, tostring, math
 
-local require = require
+local pcall, require, setmetatable = pcall, require, setmetatable
 
 local nxo = require "nixio"
 local nfs = require "nixio.fs"
 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"
 local lng = require "luci.i18n"
 local jsc = require "luci.jsonc"
@@ -108,6 +106,13 @@ function _set(c, s, o, v)
 	end
 end
 
+local function _wifi_state()
+	if not next(_ubuswificache) then
+		_ubuswificache = utl.ubus("network.wireless", "status", {}) or {}
+	end
+	return _ubuswificache
+end
+
 function _wifi_iface(x)
 	local _, p
 	for _, p in ipairs(IFACE_PATTERNS_WIRELESS) do
@@ -118,58 +123,155 @@ function _wifi_iface(x)
 	return false
 end
 
-function _wifi_state(key, val, field)
-	local radio, radiostate, ifc, ifcstate
-
-	if not next(_ubuswificache) then
-		_ubuswificache = utl.ubus("network.wireless", "status", {}) or {}
+local function _wifi_iwinfo_by_ifname(ifname, force_phy_only)
+	local stat, iwinfo = pcall(require, "iwinfo")
+	local iwtype = stat and type(ifname) == "string" and iwinfo.type(ifname)
+	local is_nonphy_op = {
+		bitrate     = true,
+		quality     = true,
+		quality_max = true,
+		mode        = true,
+		ssid        = true,
+		bssid       = true,
+		assoclist   = true,
+		encryption  = true
+	}
 
-		-- workaround extended section format
-		for radio, radiostate in pairs(_ubuswificache) do
-			for ifc, ifcstate in pairs(radiostate.interfaces) do
-				if ifcstate.section and ifcstate.section:sub(1, 1) == '@' then
-					local s = _uci:get_all('wireless.%s' % ifcstate.section)
-					if s then
-						ifcstate.section = s['.name']
-					end
+	if iwtype then
+		-- if we got a type but no real netdev, we're referring to a phy
+		local phy_only = force_phy_only or (ipc.link(ifname).type ~= 1)
+
+		return setmetatable({}, {
+			__index = function(t, k)
+				if k == "ifname" then
+					return ifname
+				elseif phy_only and is_nonphy_op[k] then
+					return nil
+				elseif iwinfo[iwtype][k] then
+					return iwinfo[iwtype][k](ifname)
 				end
 			end
-		end
+		})
 	end
+end
 
-	for radio, radiostate in pairs(_ubuswificache) do
-		for ifc, ifcstate in pairs(radiostate.interfaces) do
-			if ifcstate[key] == val then
-				return ifcstate[field]
-			end
+local function _wifi_sid_by_netid(netid)
+	if type(netid) == "string" then
+		local radioname, netidx = netid:match("^(%w+)%.network(%d+)$")
+		if radioname and netidx then
+			local i, n = 0, nil
+
+			netidx = tonumber(netidx)
+			_uci:foreach("wireless", "wifi-iface",
+				function(s)
+					if s.device == radioname then
+						i = i + 1
+						if i == netidx then
+							n = s[".name"]
+							return false
+						end
+					end
+				end)
+
+			return n
 		end
 	end
 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
+function _wifi_sid_by_ifname(ifn)
+	local sid = _wifi_sid_by_netid(ifn)
+	if sid then
+		return sid
+	end
 
-		ifnidx = tonumber(ifnidx)
-		_uci:foreach("wireless", "wifi-iface",
-			function(s)
-				if s.device == radio then
-					num = num + 1
-					if num == ifnidx then
-						sid = s['.name']
-						return false
+	local _, _, netstate = _wifi_state_by_ifname(ifn)
+	if netstate and type(netstate.section) == "string" then
+		return netstate.section
+	end
+end
+
+local function _wifi_netid_by_sid(sid)
+	local t, n = _uci:get("wireless", sid)
+	if t == "wifi-iface" and n ~= nil then
+		local radioname = _uci:get("wireless", n, "device")
+		if type(radioname) == "string" then
+			local i, netid = 0, nil
+
+			_uci:foreach("wireless", "wifi-iface",
+				function(s)
+					if s.device == radioname then
+						i = i + 1
+						if s[".name"] == n then
+							netid = "%s.network%d" %{ radioname, i }
+							return false
+						end
 					end
+				end)
+
+			return netid, radioname
+		end
+	end
+end
+
+local function _wifi_netid_by_netname(name)
+	local netid = nil
+
+	_uci:foreach("wireless", "wifi-iface",
+		function(s)
+			local net
+			for net in utl.imatch(s.network) do
+				if net == name then
+					netid = _wifi_netid_by_sid(s[".name"])
+					return false
 				end
-			end)
+			end
+		end)
 
-		return sid
+	return netid
+end
 
-	-- looks like wifi, try to locate the section via ubus state
-	elseif _wifi_iface(ifn) then
-		return _wifi_state("ifname", ifn, "section")
+local function _wifi_state_by_sid(sid)
+	local t1, n1 = _uci:get("wireless", sid)
+	if t1 == "wifi-iface" and n1 ~= nil then
+		local radioname, radiostate
+		for radioname, radiostate in pairs(_wifi_state()) do
+			if type(radiostate) == "table" and
+			   type(radiostate.interfaces) == "table"
+			then
+				local netidx, netstate
+				for netidx, netstate in ipairs(radiostate.interfaces) do
+					if type(netstate) == "table" and
+					   type(netstate.section) == "string"
+					then
+						local t2, n2 = _uci:get("wireless", netstate.section)
+						if t1 == t2 and n1 == n2 then
+							return radioname, radiostate, netstate
+						end
+					end
+				end
+			end
+		end
+	end
+end
+
+local function _wifi_state_by_ifname(ifname)
+	if type(ifname) == "string" then
+		local radioname, radiostate
+		for radioname, radiostate in pairs(_wifi_state()) do
+			if type(radiostate) == "table" and
+			   type(radiostate.interfaces) == "table"
+			then
+				local netidx, netstate
+				for netidx, netstate in ipairs(radiostate.interfaces) do
+					if type(netstate) == "table" and
+					   type(netstate.ifname) == "string" and
+					   netstate.ifname == ifname
+					then
+						return radioname, radiostate, netstate
+					end
+				end
+			end
+		end
 	end
 end
 
@@ -524,20 +626,8 @@ function get_interface(self, i)
 	if _interfaces[i] or _wifi_iface(i) then
 		return interface(i)
 	else
-		local ifc
-		local num = { }
-		_uci: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
+		local netid = _wifi_netid_by_netname(i)
+		return netid and interface(netid)
 	end
 end
 
@@ -644,7 +734,7 @@ function get_wifidevs(self)
 end
 
 function get_wifinet(self, net)
-	local wnet = _wifi_lookup(net)
+	local wnet = _wifi_sid_by_ifname(net)
 	if wnet then
 		return wifinet(wnet)
 	end
@@ -660,7 +750,7 @@ function add_wifinet(self, net, options)
 end
 
 function del_wifinet(self, net)
-	local wnet = _wifi_lookup(net)
+	local wnet = _wifi_sid_by_ifname(net)
 	if wnet then
 		_uci:delete("wireless", wnet)
 		return true
@@ -784,22 +874,7 @@ function protocol.ifname(self)
 		ifname = self:_ubus("device")
 	end
 	if not ifname then
-		local num = { }
-		_uci:foreach("wireless", "wifi-iface",
-			function(s)
-				if s.device then
-					num[s.device] = num[s.device]
-						and num[s.device] + 1 or 1
-
-					local net
-					for net in utl.imatch(s.network) do
-						if net == self.sid then
-							ifname = "%s.network%d" %{ s.device, num[s.device] }
-							return false
-						end
-					end
-				end
-			end)
+		ifname = _wifi_netid_by_netname(self.sid)
 	end
 	return ifname
 end
@@ -981,24 +1056,17 @@ function protocol.is_empty(self)
 	if self:is_floating() then
 		return false
 	else
-		local rv = true
+		local empty = true
 
 		if (self:_get("ifname") or ""):match("%S+") then
-			rv = false
+			empty = false
 		end
 
-		_uci:foreach("wireless", "wifi-iface",
-			function(s)
-				local n
-				for n in utl.imatch(s.network) do
-					if n == self.sid then
-						rv = false
-						return false
-					end
-				end
-			end)
+		if empty and _wifi_netid_by_netname(self.sid) then
+			empty = false
+		end
 
-		return rv
+		return empty
 	end
 end
 
@@ -1006,7 +1074,7 @@ function protocol.add_interface(self, ifname)
 	ifname = _M:ifnameof(ifname)
 	if ifname and not self:is_floating() then
 		-- if its a wifi interface, change its network option
-		local wif = _wifi_lookup(ifname)
+		local wif = _wifi_sid_by_ifname(ifname)
 		if wif then
 			_append("wireless", wif, "network", self.sid)
 
@@ -1021,7 +1089,7 @@ function protocol.del_interface(self, ifname)
 	ifname = _M:ifnameof(ifname)
 	if ifname and not self:is_floating() then
 		-- if its a wireless interface, clear its network option
-		local wif = _wifi_lookup(ifname)
+		local wif = _wifi_sid_by_ifname(ifname)
 		if wif then _filter("wireless", wif, "network", self.sid) end
 
 		-- remove the interface
@@ -1043,21 +1111,7 @@ function protocol.get_interface(self)
 			ifn = ifn:match("^[^:/]+")
 			return ifn and interface(ifn, self)
 		end
-		ifn = nil
-		_uci:foreach("wireless", "wifi-iface",
-			function(s)
-				if s.device then
-					num[s.device] = num[s.device] and num[s.device] + 1 or 1
-
-					local net
-					for net in utl.imatch(s.network) do
-						if net == self.sid then
-							ifn = "%s.network%d" %{ s.device, num[s.device] }
-							return false
-						end
-					end
-				end
-			end)
+		ifn = _wifi_netid_by_netname(self.sid)
 		return ifn and interface(ifn, self)
 	end
 end
@@ -1077,18 +1131,17 @@ function protocol.get_interfaces(self)
 			ifaces[#ifaces+1] = nfs[ifn]
 		end
 
-		local num = { }
 		local wfs = { }
 		_uci:foreach("wireless", "wifi-iface",
 			function(s)
 				if s.device then
-					num[s.device] = num[s.device] and num[s.device] + 1 or 1
-
 					local net
 					for net in utl.imatch(s.network) do
 						if net == self.sid then
-							ifn = "%s.network%d" %{ s.device, num[s.device] }
-							wfs[ifn] = interface(ifn, self)
+							ifn = _wifi_netid_by_sid(s[".name"])
+							if ifn then
+								wfs[ifn] = interface(ifn, self)
+							end
 						end
 					end
 				end
@@ -1119,7 +1172,7 @@ function protocol.contains_interface(self, ifname)
 			end
 		end
 
-		local wif = _wifi_lookup(ifname)
+		local wif = _wifi_sid_by_ifname(ifname)
 		if wif then
 			local n
 			for n in utl.imatch(_uci:get("wireless", wif, "network")) do
@@ -1134,17 +1187,18 @@ function protocol.contains_interface(self, ifname)
 end
 
 function protocol.adminlink(self)
-	return dsp.build_url("admin", "network", "network", self.sid)
+	local stat, dsp = pcall(require, "luci.dispatcher")
+	return stat and dsp.build_url("admin", "network", "network", self.sid)
 end
 
 
 interface = utl.class()
 
 function interface.__init__(self, ifname, network)
-	local wif = _wifi_lookup(ifname)
+	local wif = _wifi_sid_by_ifname(ifname)
 	if wif then
 		self.wif    = wifinet(wif)
-		self.ifname = _wifi_state("section", wif, "ifname")
+		self.ifname = self.wif:ifname()
 	end
 
 	self.ifname  = self.ifname or ifname
@@ -1332,9 +1386,14 @@ end
 
 wifidev = utl.class()
 
-function wifidev.__init__(self, dev)
-	self.sid    = dev
-	self.iwinfo = dev and sys.wifi.getiwinfo(dev) or { }
+function wifidev.__init__(self, name)
+	local t, n = _uci:get("wireless", name)
+	if t == "wifi-device" and n ~= nil then
+		self.sid    = n
+		self.iwinfo = _wifi_iwinfo_by_ifname(self.sid, true)
+	end
+	self.sid    = self.sid    or name
+	self.iwinfo = self.iwinfo or { ifname = self.sid }
 end
 
 function wifidev.get(self, opt)
@@ -1387,7 +1446,7 @@ function wifidev.get_wifinet(self, net)
 	if _uci:get("wireless", net) == "wifi-iface" then
 		return wifinet(net)
 	else
-		local wnet = _wifi_lookup(net)
+		local wnet = _wifi_sid_by_ifname(net)
 		if wnet then
 			return wifinet(wnet)
 		end
@@ -1421,7 +1480,7 @@ function wifidev.del_wifinet(self, net)
 	if utl.instanceof(net, wifinet) then
 		net = net.sid
 	elseif _uci:get("wireless", net) ~= "wifi-iface" then
-		net = _wifi_lookup(net)
+		net = _wifi_sid_by_ifname(net)
 	end
 
 	if net and _uci:get("wireless", net, "device") == self.sid then
@@ -1435,49 +1494,50 @@ end
 
 wifinet = utl.class()
 
-function wifinet.__init__(self, net, data)
-	self.sid = net
-
-	local n = 0
-	local num = { }
-	local netid, sid
-	_uci:foreach("wireless", "wifi-iface",
-		function(s)
-			n = n + 1
-			if s.device then
-				num[s.device] = num[s.device] and num[s.device] + 1 or 1
-				if s['.name'] == self.sid then
-					sid = "@wifi-iface[%d]" % n
-					netid = "%s.network%d" %{ s.device, num[s.device] }
-					return false
-				end
-			end
-		end)
+function wifinet.__init__(self, name, data)
+	local sid, netid, radioname, radiostate, netstate
 
+	-- lookup state by radio#.network# notation
+	sid = _wifi_sid_by_netid(name)
 	if sid then
-		local _, k, r, i
-		for k, r in pairs(_ubuswificache) do
-			if type(r) == "table" and
-			   type(r.interfaces) == "table"
-			then
-				for _, i in ipairs(r.interfaces) do
-					if type(i) == "table" and i.section == sid then
-						self._ubusdata = {
-							radio = k,
-							dev = r,
-							net = i
-						}
-					end
+		netid = name
+		radioname, radiostate, netstate = _wifi_state_by_sid(sid)
+	else
+		-- lookup state by ifname (e.g. wlan0)
+		radioname, radiostate, netstate = _wifi_state_by_ifname(name)
+		if radioname and radiostate and netstate then
+			sid = netstate.section
+			netid = _wifi_netid_by_sid(sid)
+		else
+			-- lookup state by uci section id (e.g. cfg053579)
+			radioname, radiostate, netstate = _wifi_state_by_sid(name)
+			if radioname and radiostate and netstate then
+				sid = name
+				netid = _wifi_netid_by_sid(sid)
+			else
+				-- no state available, try to resolve from uci
+				netid, radioname = _wifi_netid_by_sid(name)
+				if netid and radioname then
+					sid = name
 				end
 			end
 		end
 	end
 
-	local dev = _wifi_state("section", self.sid, "ifname") or netid
+	local iwinfo =
+		(netstate and _wifi_iwinfo_by_ifname(netstate.ifname)) or
+		(radioname and _wifi_iwinfo_by_ifname(radioname)) or
+		{ ifname = (netid or sid or name) }
 
-	self.netid  = netid
-	self.wdev   = dev
-	self.iwinfo = dev and sys.wifi.getiwinfo(dev) or { }
+	self.sid       = sid or name
+	self.wdev      = iwinfo.ifname
+	self.iwinfo    = iwinfo
+	self.netid     = netid
+	self._ubusdata = {
+		radio = radioname,
+		dev   = radiostate,
+		net   = netstate
+	}
 end
 
 function wifinet.ubus(self, ...)
@@ -1664,7 +1724,8 @@ function wifinet.get_i18n(self)
 end
 
 function wifinet.adminlink(self)
-	return dsp.build_url("admin", "network", "wireless", self.netid)
+	local stat, dsp = pcall(require, "luci.dispatcher")
+	return dsp and dsp.build_url("admin", "network", "wireless", self.netid)
 end
 
 function wifinet.get_network(self)
diff --git a/modules/luci-base/luasrc/sys.lua b/modules/luci-base/luasrc/sys.lua
index 115c54d54..3fcfd4def 100644
--- a/modules/luci-base/luasrc/sys.lua
+++ b/modules/luci-base/luasrc/sys.lua
@@ -7,6 +7,7 @@ local table  = require "table"
 local nixio  = require "nixio"
 local fs     = require "nixio.fs"
 local uci    = require "luci.model.uci"
+local ntm    = require "luci.model.network"
 
 local luci  = {}
 luci.util   = require "luci.util"
@@ -451,37 +452,9 @@ end
 wifi = {}
 
 function wifi.getiwinfo(ifname)
-	local stat, iwinfo = pcall(require, "iwinfo")
-
-	if ifname then
-		local d, n = ifname:match("^(%w+)%.network(%d+)")
-		local wstate = luci.util.ubus("network.wireless", "status") or { }
-
-		d = d or ifname
-		n = n and tonumber(n) or 1
-
-		if type(wstate[d]) == "table" and
-		   type(wstate[d].interfaces) == "table" and
-		   type(wstate[d].interfaces[n]) == "table" and
-		   type(wstate[d].interfaces[n].ifname) == "string"
-		then
-			ifname = wstate[d].interfaces[n].ifname
-		else
-			ifname = d
-		end
-
-		local t = stat and iwinfo.type(ifname)
-		local x = t and iwinfo[t] or { }
-		return setmetatable({}, {
-			__index = function(t, k)
-				if k == "ifname" then
-					return ifname
-				elseif x[k] then
-					return x[k](ifname)
-				end
-			end
-		})
-	end
+	ntm.init()
+	local wnet = ntm.wifinet(ifname)
+	return wnet.iwinfo or { ifname = ifname }
 end
 
 
-- 
2.11.0