Implemented a Table-to-Table protocol a.k.a The Pipe.

configure.in

@@ -8,7 +8,7 @@ AC_CONFIG_AUX_DIR(tools)
 
 AC_ARG_ENABLE(debug,[  --enable-debug          enable internal debugging routines (default: enabled)],,enable_debug=yes)
 AC_ARG_WITH(sysconfig,[  --with-sysconfig=FILE   use specified BIRD system configuration file])
-AC_ARG_WITH(protocols,[  --with-protocols=LIST   include specified routing protocols (default: rip,static)],,[with_protocols="rip,static"])
+AC_ARG_WITH(protocols,[  --with-protocols=LIST   include specified routing protocols (default: rip,static,pipe)],,[with_protocols="rip,static,pipe"])
 AC_ARG_WITH(sysinclude,[  --with-sysinclude=PATH  search for system includes on specified place])
 
 if test "$srcdir" = . ; then

doc/bird.conf.example

@@ -50,3 +50,9 @@ protocol static {
 #	route 10.1.3.0:255.255.255.0 via 62.168.0.4;
 #	route 10.2.0.0/24 via "arc0";
 }
+
+#protocol pipe {
+#	peer table testable;
+#	import all;
+#	export all;
+#}

nest/protocol.h

@@ -64,6 +64,7 @@ extern struct protocol proto_device;
 extern struct protocol proto_rip;
 extern struct protocol proto_static;
 extern struct protocol proto_ospf;
+extern struct protocol proto_pipe;
 
 /*
  *	Routing Protocol Instance

nest/route.h

@@ -117,6 +117,7 @@ typedef struct rtable {
   struct fib fib;
   char *name;				/* Name of this table */
   list hooks;				/* List of announcement hooks */
+  int pipe_busy;			/* Pipe loop detection */
 } rtable;
 
 typedef struct network {
@@ -223,6 +224,7 @@ typedef struct rta {
 #define RTS_OSPF_IA 10			/* OSPF inter-area route */
 #define RTS_OSPF_BOUNDARY 11		/* OSPF route to boundary router (???) */
 #define RTS_BGP 12			/* BGP route */
+#define RTS_PIPE 13			/* Inter-table wormhole */
 
 #define RTC_UNICAST 0
 #define RTC_BROADCAST 1
@@ -316,6 +318,7 @@ static inline eattr * rta_find(rta *a, unsigned ea) { return ea_find(a->attrs, e
 #define DEF_PREF_BGP		100	/* BGP */
 #define DEF_PREF_OSPF_EXTERNAL	80	/* OSPF external routes */
 #define DEF_PREF_RIP_EXTERNAL	70	/* RIP external routes */
+#define DEF_PREF_PIPE		60	/* Routes piped from other tables */
 #define DEF_PREF_UKR		50	/* Unidentified Kernel Route */
 #define DEF_PREF_SINK		10	/* Sink route */