diff --git a/lib/printf.c b/lib/printf.c
index 533a1300..7ccbb4cc 100644
--- a/lib/printf.c
+++ b/lib/printf.c
@@ -8,6 +8,7 @@
  */
 
 #include "nest/bird.h"
+#include "conf/conf.h"
 #include "string.h"
 
 #include <errno.h>
diff --git a/lua/common.c b/lua/common.c
index fea030f5..d9467967 100644
--- a/lua/common.c
+++ b/lua/common.c
@@ -1,4 +1,5 @@
 #include "nest/bird.h"
+#include "conf/conf.h"
 #include "filter/filter.h"
 #include "lua.h"
 
@@ -54,24 +55,88 @@ static int luaB_trace(lua_State *L) {
   return 0;
 }
 
-void luaB_push_bird_table(lua_State *L) {
+#define lua_sett(L, idx, val, what) do { \
+  lua_pushstring(L, idx); \
+  lua_push##what(L, val); \
+  lua_settable(L, -3); \
+} while (0)
+
+#define lua_settablecfunction(L, idx, val)  lua_sett(L, idx, val, cfunction)
+#define lua_settableinteger(L, idx, val)    lua_sett(L, idx, val, integer)
+#define lua_settableip4(L, idx, val)	    lua_sett(L, idx, val, ip4)
+
+static int luaB_generic_concat(lua_State *L) {
+  int n = lua_gettop(L);
+  if (n != 2) {
+    log(L_WARN "__concat needs exactly 2 arguments");
+    return 0;
+  }
+
+  const char *a, *b;
+  size_t la, lb;
+
+  a = luaL_tolstring(L, 1, &la);
+  b = luaL_tolstring(L, 2, &lb);
+
+  if (a == NULL) {
+    a = "";
+    la = 0;
+  }
+
+  if (b == NULL) {
+    b = "";
+    lb = 0;
+  }
+
+  char *c = alloca(la + lb + 1);
+  memcpy(c, a, la);
+  memcpy(c + la, b, lb);
+  c[la + lb] = 0;
+
+  lua_pushlstring(L, c, la + lb);
+
+  return 1;
+}
+
+static int luaB_ip4_tostring(lua_State *L) {
+  int n = lua_gettop(L);
+  if (n != 1) {
+    log(L_WARN "__tostring needs exactly 1 argument");
+    return 0;
+  }
+
+  lua_pushliteral(L, "addr");
+  lua_gettable(L, 1);
+  lua_Integer a = lua_tointeger(L, -1);
+  char c[IP4_MAX_TEXT_LENGTH];
+  bsnprintf(c, IP4_MAX_TEXT_LENGTH, "%I4", a);
+
+  lua_pushstring(L, c);
+  return 1;
+}
+
+static void lua_puship4(lua_State *L, ip4_addr a) {
+  lua_newtable(L);
+  lua_settableinteger(L, "addr", a);
+
+  lua_newtable(L);
+  lua_settablecfunction(L, "__tostring", luaB_ip4_tostring);
+  lua_settablecfunction(L, "__concat", luaB_generic_concat);
+  lua_setmetatable(L, -2);
+}
+
+void luaB_push_bird(lua_State *L) {
   lua_newtable(L);
 
-  lua_pushstring(L, "err");
-  lua_pushcfunction(L, luaB_err);
-  lua_settable(L, -3);
+  lua_settablecfunction(L, "err", luaB_err);
+  lua_settablecfunction(L, "warn", luaB_warn);
+  lua_settablecfunction(L, "info", luaB_info);
+  lua_settablecfunction(L, "trace", luaB_trace);
 
-  lua_pushstring(L, "warn");
-  lua_pushcfunction(L, luaB_warn);
-  lua_settable(L, -3);
-
-  lua_pushstring(L, "info");
-  lua_pushcfunction(L, luaB_info);
-  lua_settable(L, -3);
-
-  lua_pushstring(L, "trace");
-  lua_pushcfunction(L, luaB_trace);
-  lua_settable(L, -3);
+  lua_settableip4(L, "router_id", config->router_id);
 
   lua_setglobal(L, "bird");
 }
+
+void luaB_push_route(lua_State *L, struct rte *e) {
+}
diff --git a/lua/filter.c b/lua/filter.c
index 9dabb28f..aae549ab 100644
--- a/lua/filter.c
+++ b/lua/filter.c
@@ -9,7 +9,8 @@
 int filter_lua_chunk(const char *chunk, struct rte **e, struct rta *a, struct ea_list **ea, struct linpool *lp) {
   lua_State *L = luaL_newstate();
   luaL_openlibs(L);
-  luaB_push_bird_table(L);
+  luaB_push_bird(L);
+  luaB_push_route(L, *e);
   int le = luaL_dostring(L, chunk);
   int out;
   if (le) {
diff --git a/lua/lua.h b/lua/lua.h
index 7e6f31ce..d2c522b9 100644
--- a/lua/lua.h
+++ b/lua/lua.h
@@ -2,4 +2,5 @@
 
 #include <lua.h>
 
-void luaB_push_bird_table(lua_State *L);
+void luaB_push_bird(lua_State *L);
+void luaB_push_route(lua_State *L, rte *e);