applications/luci-siitwizard/luasrc/model/cbi/siitwizard.lua

   1 --[[
   2 LuCI - Lua Configuration Interface
   3
   4 Copyright 2008 Steven Barth <steven@midlink.org>
   5 Copyright 2008 Jo-Philipp Wich <xm@leipzig.freifunk.net>
   6
   7 Licensed under the Apache License, Version 2.0 (the "License");
   8 you may not use this file except in compliance with the License.
   9 You may obtain a copy of the License at
  10
  11 http://www.apache.org/licenses/LICENSE-2.0
  12
  13 $Id$
  14
  15 ]]--
  16
  17 local uci = require "luci.model.uci".cursor()
  18
  19 -------------------- Init --------------------
  20
  21 --
  22 -- Find link-local address
  23 --
  24 LL_PREFIX = luci.ip.IPv6("fe80::/64")
  25 function find_ll()
  26         for _, r in ipairs(luci.sys.net.routes6()) do
  27                 if LL_PREFIX:contains(r.dest) and r.dest:higher(LL_PREFIX) then
  28                         return r.dest:sub(LL_PREFIX)
  29                 end
  30         end
  31         return luci.ip.IPv6("::")
  32 end
  33
  34 --
  35 -- Determine defaults
  36 --
  37 local ula_prefix  = uci:get("siit", "ipv6", "ula_prefix")  or "fd00::"
  38 local ula_global  = uci:get("siit", "ipv6", "ula_global")  or "00ca:ffee:babe::"                -- = Freifunk
  39 local ula_subnet  = uci:get("siit", "ipv6", "ula_subnet")  or "0000:0000:0000:4223::"   -- = Berlin
  40 local siit_prefix = uci:get("siit", "ipv6", "siit_prefix") or "::ffff:0000:0000"
  41 local ipv4_pool   = uci:get("siit", "ipv4", "pool")        or "172.16.0.0/12"
  42 local ipv4_netsz  = uci:get("siit", "ipv4", "netsize")     or "24"
  43
  44 --
  45 -- Find IPv4 allocation pool
  46 --
  47 local gv4_net = luci.ip.IPv4(ipv4_pool)
  48
  49 --
  50 -- Generate ULA
  51 --
  52 local ula = luci.ip.IPv6("::/64")
  53
  54 for _, prefix in ipairs({ ula_prefix, ula_global, ula_subnet }) do
  55         ula = ula:add(luci.ip.IPv6(prefix))
  56 end
  57
  58 ula = ula:add(find_ll())
  59
  60
  61 -------------------- View --------------------
  62 f = SimpleForm("siitwizward", "SIIT-Wizzard",
  63  "This wizzard helps to setup SIIT (IPv4-over-IPv6) translation according to RFC2765.")
  64
  65 f:field(DummyValue, "info_ula", "Mesh ULA address").value = ula:string()
  66
  67 f:field(DummyValue, "ipv4_pool", "IPv4 allocation pool").value =
  68         "%s (%i hosts)" %{ gv4_net:string(), 2 ^ ( 32 - gv4_net:prefix() ) - 2 }
  69
  70 f:field(DummyValue, "ipv4_size", "IPv4 LAN network prefix").value =
  71         "%i bit (%i hosts)" %{ ipv4_netsz, 2 ^ ( 32 - ipv4_netsz ) - 2 }
  72
  73 mode = f:field(ListValue, "mode", "Operation mode")
  74 mode:value("client", "Client")
  75 mode:value("gateway", "Gateway")
  76
  77 dev = f:field(ListValue, "device", "Wireless device")
  78 uci:foreach("wireless", "wifi-device",
  79         function(section)
  80                 dev:value(section[".name"])
  81         end)
  82
  83 lanip = f:field(Value, "ipaddr", "LAN IPv4 subnet")
  84 function lanip.formvalue(self, section)
  85         local val = self.map:formvalue(self:cbid(section))
  86         local net = luci.ip.IPv4("%s/%i" %{ val, ipv4_netsz })
  87
  88         if net then
  89                 if gv4_net:contains(net) then
  90                         if not net:minhost():equal(net:host()) then
  91                                 self.error = { [section] = true }
  92                                 f.errmessage = "IPv4 address is not the first host of " ..
  93                                         "subnet, expected " .. net:minhost():string()
  94                         end
  95                 else
  96                         self.error = { [section] = true }
  97                         f.errmessage = "IPv4 address is not within the allocation pool"
  98                 end
  99         else
 100                 self.error = { [section] = true }
 101                 f.errmessage = "Invalid IPv4 address given"
 102         end
 103
 104         return val
 105 end
 106
 107 dns = f:field(Value, "dns", "DNS server for LAN clients")
 108 dns.value = "141.1.1.1"
 109
 110 -------------------- Control --------------------
 111 function f.handle(self, state, data)
 112         if state == FORM_VALID then
 113                 luci.http.redirect(luci.dispatcher.build_url("admin", "uci", "changes"))
 114                 return false
 115         end
 116         return true
 117 end
 118
 119 function mode.write(self, section, value)
 120
 121         --
 122         -- Find LAN IPv4 range
 123         --
 124         local lan_net = luci.ip.IPv4(
 125                 ( lanip:formvalue(section) or "172.16.0.1" ) .. "/" .. ipv4_netsz
 126         )
 127
 128         if not lan_net then return end
 129
 130         --
 131         -- Find wifi interface, dns server and hostname
 132         --
 133         local device      = dev:formvalue(section)
 134         local dns_server  = dns:formvalue(section) or "141.1.1.1"
 135         local hostname    = "siit-" .. lan_net:host():string():gsub("%.","-")
 136
 137         --
 138         -- Configure wifi device
 139         --
 140         local wifi_device  = dev:formvalue(section)
 141         local wifi_essid   = uci:get("siit", "wifi", "essid")   or "6mesh.freifunk.net"
 142         local wifi_bssid   = uci:get("siit", "wifi", "bssid")   or "02:ca:ff:ee:ba:be"
 143         local wifi_channel = uci:get("siit", "wifi", "channel") or "1"
 144
 145         -- nuke old device definition
 146         uci:delete_all("wireless", "wifi-iface",
 147                 function(s) return s.device == wifi_device end )
 148
 149         uci:delete_all("network", "interface",
 150                 function(s) return s['.name'] == wifi_device end )
 151
 152         -- create wifi device definition
 153         uci:tset("wireless", wifi_device, {
 154                 disabled  = 0,
 155                 channel   = wifi_channel,
 156 --              txantenna = 1,
 157 --              rxantenna = 1,
 158 --              diversity = 0
 159         })
 160
 161         uci:section("wireless", "wifi-iface", nil, {
 162                 encryption = "none",
 163                 mode       = "adhoc",
 164                 txpower    = 10,
 165                 sw_merge   = 1,
 166                 network    = wifi_device,
 167                 device     = wifi_device,
 168                 ssid       = wifi_essid,
 169                 bssid      = wifi_bssid,
 170         })
 171
 172         --
 173         -- Gateway mode
 174         --
 175         --      * wan port is dhcp, lan port is 172.23.1.1/24
 176         --      * siit0 gets a dummy address: 169.254.42.42
 177         --      * wl0 gets an ipv6 address, in this case the fdca:ffee:babe::1:1/64
 178         --      * we do a ::ffff:ffff:0/96 route into siit0, so everything from 6mesh goes into translation.
 179         --      * an HNA6 of ::ffff:ffff:0:0/96 announces the mapped 0.0.0.0/0 ipv4 space.
 180         --      * MTU on WAN, LAN down to 1400, ipv6 headers are slighly larger.
 181
 182         if value == "gateway" then
 183
 184                 -- wan mtu
 185                 uci:set("network", "wan", "mtu", 1240)
 186
 187                 -- lan settings
 188                 uci:tset("network", "lan", {
 189                         mtu     = 1240,
 190                         ipaddr  = lan_net:host():string(),
 191                         netmask = lan_net:mask():string(),
 192                         proto   = "static"
 193                 })
 194
 195                 -- use full siit subnet
 196                 siit_route = luci.ip.IPv6(siit_prefix .. "/96")
 197
 198                 -- v4 <-> siit route
 199                 uci:delete_all("network", "route",
 200                         function(s) return s.interface == "siit0" end)
 201
 202                 uci:section("network", "route", nil, {
 203                         interface = "siit0",
 204                         target    = gv4_net:network():string(),
 205                         netmask   = gv4_net:mask():string()
 206                 })
 207
 208         --
 209         -- Client mode
 210         --
 211         --      * 172.23.2.1/24 on its lan, fdca:ffee:babe::1:2 on wl0 and the usual dummy address on siit0.
 212         --      * we do a ::ffff:ffff:172.13.2.0/120 to siit0, because in this case, only traffic directed to clients needs to go into translation.
 213         --      * same route as HNA6 announcement to catch the traffic out of the mesh.
 214         --      * Also, MTU on LAN reduced to 1400.
 215
 216         else
 217
 218                 -- lan settings
 219                 uci:tset("network", "lan", {
 220                         mtu     = 1240,
 221                         ipaddr  = lan_net:host():string(),
 222                         netmask = lan_net:mask():string()
 223                 })
 224
 225                 -- derive siit subnet from lan config
 226                 siit_route = luci.ip.IPv6(
 227                         siit_prefix .. "/" .. (96 + lan_net:prefix())
 228                 ):add(lan_net[2])
 229
 230                 -- ipv4 <-> siit route
 231                 uci:delete_all("network", "route",
 232                         function(s) return s.interface == "siit0" end)
 233
 234                 -- XXX: kind of a catch all, gv4_net would be better
 235                 --      but does not cover non-local v4 space
 236                 uci:section("network", "route", nil, {
 237                         interface = "siit0",
 238                         target    = "0.0.0.0",
 239                         netmask   = "0.0.0.0"
 240                 })
 241         end
 242
 243         -- setup the firewall
 244         uci:delete_all("firewall", "zone",
 245                 function(s) return (
 246                         s['.name'] == "siit0" or s.name == "siit0" or
 247                         s.network == "siit0" or s['.name'] == wifi_device or
 248                         s.name == wifi_device or s.network == wifi_device
 249                 ) end)
 250
 251         uci:delete_all("firewall", "forwarding",
 252                 function(s) return (
 253                         s.src == wifi_device and s.dest == "siit0" or
 254                         s.dest == wifi_device and s.src == "siit0" or
 255                         s.src == "lan" and s.dest == "siit0" or
 256                         s.dest == "lan" and s.src == "siit0"
 257                 ) end)
 258
 259         uci:section("firewall", "zone", "siit0", {
 260                 name    = "siit0",
 261                 network = "siit0",
 262                 input   = "ACCEPT",
 263                 output  = "ACCEPT",
 264                 forward = "ACCEPT"
 265         })
 266
 267         uci:section("firewall", "zone", wifi_device, {
 268                 name    = wifi_device,
 269                 network = wifi_device,
 270                 input   = "ACCEPT",
 271                 output  = "ACCEPT",
 272                 forward = "ACCEPT"
 273         })
 274
 275         uci:section("firewall", "forwarding", nil, {
 276                 src  = wifi_device,
 277                 dest = "siit0"
 278         })
 279
 280         uci:section("firewall", "forwarding", nil, {
 281                 src  = "siit0",
 282                 dest = wifi_device
 283         })
 284
 285         uci:section("firewall", "forwarding", nil, {
 286                 src  = "lan",
 287                 dest = "siit0"
 288         })
 289
 290         uci:section("firewall", "forwarding", nil, {
 291                 src  = "siit0",
 292                 dest = "lan"
 293         })
 294
 295         -- firewall include
 296         uci:delete_all("firewall", "include",
 297                 function(s) return s.path == "/etc/firewall.user" end)
 298
 299         uci:section("firewall", "include", nil, {
 300                 path = "/etc/firewall.user"
 301         })
 302
 303
 304         -- siit0 interface
 305         uci:delete_all("network", "interface",
 306                 function(s) return ( s.ifname == "siit0" ) end)
 307
 308         uci:section("network", "interface", "siit0", {
 309                 ifname  = "siit0",
 310                 proto   = "none"
 311         })
 312
 313         -- siit0 route
 314         uci:delete_all("network", "route6",
 315                 function(s) return siit_route:contains(luci.ip.IPv6(s.target)) end)
 316
 317         uci:section("network", "route6", nil, {
 318                 interface = "siit0",
 319                 target    = siit_route:string()
 320         })
 321
 322         -- create wifi network interface
 323         uci:section("network", "interface", wifi_device, {
 324                 proto   = "static",
 325                 mtu     = 1400,
 326                 ip6addr = ula:string()
 327         })
 328
 329         -- nuke old olsrd interfaces
 330         uci:delete_all("olsrd", "Interface",
 331                 function(s) return s.interface == wifi_device end)
 332
 333         -- configure olsrd interface
 334         uci:foreach("olsrd", "olsrd",
 335                 function(s) uci:set("olsrd", s['.name'], "IpVersion", 6) end)
 336
 337         uci:section("olsrd", "Interface", nil, {
 338                 ignore      = 0,
 339                 interface   = wifi_device,
 340                 Ip6AddrType = "unique-local"
 341         })
 342
 343         -- hna6
 344         uci:delete_all("olsrd", "Hna6",
 345                 function(s) return true end)
 346
 347         uci:section("olsrd", "Hna6", nil, {
 348                 netaddr = siit_route:host():string(),
 349                 prefix  = siit_route:prefix()
 350         })
 351
 352         -- txtinfo v6 & olsrd nameservice
 353         uci:foreach("olsrd", "LoadPlugin",
 354                 function(s)
 355                         if s.library == "olsrd_txtinfo.so.0.1" then
 356                                 uci:set("olsrd", s['.name'], "accept", "::1")
 357                         elseif s.library == "olsrd_nameservice.so.0.3" then
 358                                 uci:set("olsrd", s['.name'], "name", hostname)
 359                         end
 360                 end)
 361
 362         -- lan dns
 363         uci:tset("dhcp", "lan", {
 364                 dhcp_option = "6," .. dns_server,
 365                 start       = bit.band(lan_net:minhost():add(1)[2][2], 0xFF),
 366                 limit       = ( 2 ^ ( 32 - lan_net:prefix() ) ) - 3
 367         })
 368
 369         -- hostname
 370         uci:foreach("system", "system",
 371                 function(s)
 372                         uci:set("system", s['.name'], "hostname", hostname)
 373                 end)
 374
 375         uci:save("wireless")
 376         uci:save("firewall")
 377         uci:save("network")
 378         uci:save("system")
 379         uci:save("olsrd")
 380         uci:save("dhcp")
 381 end
 382
 383 return f