switch to Lua 5.3

fixes #8377

Makefile

 # Installer Makefile for Alpine Wall
-# Copyright (C) 2012-2018 Kaarle Ritvanen
+# Copyright (C) 2012-2020 Kaarle Ritvanen
 # See LICENSE file for license details
 
 ROOT_DIR := /
-LUA_VERSION := 5.2
+LUA_VERSION := 5.3
 
 resdir := usr/share/awall
 confdir := etc/awall

awall/iptables.lua

@@ -106,17 +106,19 @@ function BaseIPTables:flush() M.flush() end
 M.IPTables = class(BaseIPTables)
 
 function M.IPTables:init()
-   self.config = {}
-   setmetatable(
-      self.config,
-      {
-	 __index=function(t, k)
-	    t[k] = {}
-	    setmetatable(t[k], getmetatable(t))
-	    return t[k]
-	 end
-      }
-   )
+   local function nestedtable(levels)
+      return levels > 0 and setmetatable(
+	 {},
+	 {
+	    __index=function(t, k)
+	       t[k] = nestedtable(getmetatable(t).levels - 1)
+	       return t[k]
+	    end,
+	    levels=levels
+	 }
+      ) or {}
+   end
+   self.config = nestedtable(3)
 end
 
 function M.IPTables:dumpfile(family, iptfile)

awall/model.lua

@@ -733,14 +733,14 @@ function M.Maskable:recentmask(name)
 	 for i = 0, 3 do
 	    if len <= i * 8 then octet = 0
 	    elseif len > i * 8 + 7 then octet = 255
-	    else octet = 256 - 2^(8 - len % 8) end
+	    else octet = 256 - math.floor(2^(8 - len % 8)) end
 	    mask = util.join(mask, '.', octet)
 	 end
 
       elseif family == 'inet6' then
 	 while len > 0 do
 	    if #mask % 5 == 4 then mask = mask..':' end
-	    mask = mask..('%x'):format(16 - 2^math.max(0, 4 - len))
+	    mask = mask..('%x'):format(16 - math.floor(2^math.max(0, 4 - len)))
 	    len = len - 4
 	 end
 	 while #mask % 5 < 4 do mask = mask..'0' end