diff -purN a/doc/bird.sgml b/doc/bird.sgml
--- a/doc/bird.sgml	2013-09-25 12:35:37.805081155 +0300
+++ b/doc/bird.sgml	2013-09-25 12:56:20.725342862 +0300
@@ -1238,6 +1238,21 @@ undefined value is regarded as empty cli
 	only to <cf/RTD_BLACKHOLE/, <cf/RTD_UNREACHABLE/ or
 	<cf/RTD_PROHIBIT/.
 
+	<tag><m/string/ ifname</tag>
+	Name of the outgoing interface. Standard string comparison operations
+	(e.g. <cf/=, !=, &lt;, &gt;, &lt;=, &gt;=/) also applicable to this attribute.
+	Additionaly matching <cf/&tilde;/ operator could be used to match value
+	against shell pattern like in <cf/interface/ directive. Sink routes
+	(like blackhole, unreachable or prohibit) has no interface associated
+	with it, so <cf/ifname/ returns an empty string for such routes. Read-only.
+
+	<tag><m/int/ ifindex</tag>
+	Index of the outgoing interface. System wide index of the interface.
+	May be used for interface matching, however indexes might change on
+	interface creation/removal. Same notes about sink routes as described
+	for <cf/ifname/ also applicable to this attribute and <cf/ifindex/ returns
+	zero for such routes. Read-only.
+
 	<tag><m/int/ igp_metric</tag>
 	The optional attribute that can be used to specify a distance
 	to the network for routes that do not have a native protocol
diff -purN a/filter/config.Y b/filter/config.Y
--- a/filter/config.Y	2013-09-25 12:35:37.805081155 +0300
+++ b/filter/config.Y	2013-09-25 12:34:55.975324066 +0300
@@ -259,7 +259,8 @@ CF_KEYWORDS(FUNCTION, PRINT, PRINTN, UNS
 	SET, STRING, BGPMASK, BGPPATH, CLIST, ECLIST,
 	IF, THEN, ELSE, CASE,
 	TRUE, FALSE, RT, RO, UNKNOWN, GENERIC,
-	FROM, GW, NET, MASK, PROTO, SOURCE, SCOPE, CAST, DEST, PREFERENCE,
+	FROM, GW, NET, MASK, PROTO, SOURCE, SCOPE, CAST, DEST, IFNAME, IFINDEX,
+	PREFERENCE,
 	LEN,
 	DEFINED,
 	ADD, DELETE, CONTAINS, RESET,
@@ -687,6 +688,8 @@ static_attr:
  | SCOPE   { $$ = f_new_inst(); $$->aux = T_ENUM_SCOPE; $$->a2.i = OFFSETOF(struct rta, scope);  $$->a1.i = 1; }
  | CAST    { $$ = f_new_inst(); $$->aux = T_ENUM_RTC;   $$->a2.i = OFFSETOF(struct rta, cast); }
  | DEST    { $$ = f_new_inst(); $$->aux = T_ENUM_RTD;   $$->a2.i = OFFSETOF(struct rta, dest);   $$->a1.i = 1; }
+ | IFNAME  { $$ = f_new_inst(); $$->aux = T_STRING;     $$->a2.i = OFFSETOF(struct iface, name); }
+ | IFINDEX { $$ = f_new_inst(); $$->aux = T_INT;        $$->a2.i = OFFSETOF(struct iface, index); }
  ;
 
 term:
diff -purN a/filter/filter.c b/filter/filter.c
--- a/filter/filter.c	2013-09-25 12:35:37.805081155 +0300
+++ b/filter/filter.c	2013-09-25 12:47:48.703794821 +0300
@@ -915,14 +915,24 @@ interpret(struct f_inst *what)
       res.type = f_inst_aux_f_type(what->aux);
 
       switch(res.type) {
+      case T_INT:
+	if (what->a2.i == OFFSETOF(struct iface, index))
+	  res.val.i = rta->iface ? rta->iface->index : 0;
+	else
+	  res.val.i = 0;
+	break;
       case T_IP:
 	res.val.px.ip = * (ip_addr *) ((char *) rta + what->a2.i);
 	break;
       case T_ENUM:
 	res.val.i = * ((char *) rta + what->a2.i);
 	break;
-      case T_STRING:	/* Warning: this is a special case for proto attribute */
-	res.val.s = rta->proto->name;
+      case T_STRING:
+	if (what->a2.i == OFFSETOF(struct iface, name))
+	  res.val.s = rta->iface ? rta->iface->name : "";
+	else
+	  /* Warning: this is a special case for proto attribute */
+	  res.val.s = rta->proto->name;
 	break;
       case T_PREFIX:	/* Warning: this works only for prefix of network */
 	{