diff --git a/extensions/rt_busypeers/rtbusy_conf.y b/extensions/rt_busypeers/rtbusy_conf.y
new file mode 100644
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--- /dev/null
+++ b/extensions/rt_busypeers/rtbusy_conf.y
@@ -0,0 +1,168 @@
+/*********************************************************************************************************
+* Software License Agreement (BSD License)                                                               *
+* Author: Sebastien Decugis <sdecugis@freediameter.net>							 *
+*													 *
+* Copyright (c) 2013, WIDE Project and NICT								 *
+* All rights reserved.											 *
+* 													 *
+* Redistribution and use of this software in source and binary forms, with or without modification, are  *
+* permitted provided that the following conditions are met:						 *
+* 													 *
+* * Redistributions of source code must retain the above 						 *
+*   copyright notice, this list of conditions and the 							 *
+*   following disclaimer.										 *
+*    													 *
+* * Redistributions in binary form must reproduce the above 						 *
+*   copyright notice, this list of conditions and the 							 *
+*   following disclaimer in the documentation and/or other						 *
+*   materials provided with the distribution.								 *
+* 													 *
+* * Neither the name of the WIDE Project or NICT nor the 						 *
+*   names of its contributors may be used to endorse or 						 *
+*   promote products derived from this software without 						 *
+*   specific prior written permission of WIDE Project and 						 *
+*   NICT.												 *
+* 													 *
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED *
+* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
+* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR *
+* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 	 *
+* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 	 *
+* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
+* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF   *
+* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.								 *
+*********************************************************************************************************/
+
+/* Yacc extension's configuration parser.
+ */
+
+/* For development only : */
+%debug 
+%error-verbose
+
+/* The parser receives the configuration file filename as parameter */
+%parse-param {char * conffile}
+
+/* Keep track of location */
+%locations 
+%pure-parser
+
+%{
+#include "rtbusy.h"
+#include "rtbusy_conf.tab.h"
+
+/* Forward declaration */
+int yyparse(char * conffile);
+
+/* Parse the configuration file */
+int rtbusy_conf_handle(char * conffile)
+{
+	extern FILE * rtbusy_confin;
+	int ret;
+	
+	TRACE_ENTRY("%p", conffile);
+	
+	TRACE_DEBUG (FULL, "Parsing configuration file: %s...", conffile);
+	
+	rtbusy_confin = fopen(conffile, "r");
+	if (rtbusy_confin == NULL) {
+		ret = errno;
+		TRACE_ERROR("Unable to open extension configuration file %s for reading: %s", conffile, strerror(ret));
+		return ret;
+	}
+
+	ret = yyparse(conffile);
+
+	fclose(rtbusy_confin);
+
+	if (ret != 0) {
+		TRACE_ERROR( "Unable to parse the configuration file.");
+		return EINVAL;
+	} else {
+		TRACE_DEBUG(FULL, "[rt_busypeers] Configuration: %d-%d-%d-%d.", rtbusy_conf.SkipTooBusyErrors, rtbusy_conf.RetryDistantPeers, rtbusy_conf.RetryMaxPeers, rtbusy_conf.RelayTimeout);
+	}
+	
+	return 0;
+}
+
+/* The Lex parser prototype */
+int rtbusy_conflex(YYSTYPE *lvalp, YYLTYPE *llocp);
+
+/* Function to report the errors */
+void yyerror (YYLTYPE *ploc, char * conffile, char const *s)
+{
+	TRACE_DEBUG(INFO, "Error in configuration parsing");
+	
+	if (ploc->first_line != ploc->last_line)
+		fd_log_error("%s:%d.%d-%d.%d : %s", conffile, ploc->first_line, ploc->first_column, ploc->last_line, ploc->last_column, s);
+	else if (ploc->first_column != ploc->last_column)
+		fd_log_error("%s:%d.%d-%d : %s", conffile, ploc->first_line, ploc->first_column, ploc->last_column, s);
+	else
+		fd_log_error("%s:%d.%d : %s", conffile, ploc->first_line, ploc->first_column, s);
+}
+
+%}
+
+/* Values returned by lex for token */
+%union {
+	int		integer;
+}
+
+/* In case of error in the lexical analysis */
+%token 		LEX_ERROR
+
+/* A (de)quoted string (malloc'd in lex parser; it must be freed after use) */
+%token <integer> INTEGER
+
+/* Tokens */
+%token 		SKIPTOOBUSYERRORS
+%token 		RETRYDISTANTPEERS
+%token 		RETRYMAXPEERS
+%token 		RELAYTIMEOUT
+
+
+/* -------------------------------------- */
+%%
+
+	/* The grammar definition */
+conffile:		/* empty is OK */
+			| conffile toobusy
+			| conffile distant
+			| conffile maxretry
+			| conffile timeout
+			| conffile errors
+			{
+				yyerror(&yylloc, conffile, "An error occurred while parsing the configuration file");
+				return EINVAL;
+			}
+			;
+			
+			/* Lexical or syntax error */
+errors:			LEX_ERROR
+			| error
+			;
+
+toobusy:		SKIPTOOBUSYERRORS ';'
+			{
+				rtbusy_conf.SkipTooBusyErrors=1;
+			}
+			;
+			
+distant:		RETRYDISTANTPEERS ';'
+			{
+				rtbusy_conf.RetryDistantPeers=1;
+			}
+			;
+			
+maxretry:		RETRYMAXPEERS '=' INTEGER ';'
+			{
+				rtbusy_conf.RetryMaxPeers=$3;
+			}
+			;
+			
+timeout:		RELAYTIMEOUT '=' INTEGER ';'
+			{
+				rtbusy_conf.RelayTimeout=$3;
+			}
+			;
+