diff --git a/src/lib/bindx.c b/src/lib/bindx.c
new file mode 100644
index 0000000..5f44874
--- /dev/null
+++ b/src/lib/bindx.c
@@ -0,0 +1,78 @@
+/* SCTP kernel Implementation: User API extensions.
+ *
+ * bindx.c
+ *
+ * Distributed under the terms of the LGPL v2.1 as described in
+ *    http://www.gnu.org/copyleft/lesser.txt 
+ *
+ * This file is part of the user library that offers support for the
+ * SCTP kernel Implementation. The main purpose of this
+ * code is to provide the SCTP Socket API mappings for user
+ * application to interface with the SCTP in kernel.
+ *
+ * This implementation is based on the Socket API Extensions for SCTP
+ * defined in <draft-ietf-tsvwg-sctpsocket-10.txt.
+ *
+ * (C) Copyright IBM Corp. 2001, 2003
+ * Copyright (c) 2002 Intel Corporation.
+ *
+ * Written or modified by:
+ *   La Monte H.P. Yarroll <piggy@acm.org>
+ *   Daisy Chang           <daisyc@us.ibm.com>
+ *   Inaky Perez-Gonzalez  <inaky.gonzalez@intel.com>
+ *   Sridhar Samudrala     <sri@us.ibm.com>
+ */
+
+#include <sys/socket.h>   /* struct sockaddr_storage, setsockopt() */
+#include <netinet/in.h>
+#include <netinet/sctp.h> /* SCTP_SOCKOPT_BINDX_* */
+#include <errno.h>
+
+/* Support the sctp_bindx() interface.
+ *
+ * See Sockets API Extensions for SCTP. Section 8.1.
+ *
+ * Instead of implementing through a socket call in sys_socketcall(),
+ * tunnel the request through setsockopt().
+ */
+int
+sctp_bindx(int fd, struct sockaddr *addrs, int addrcnt, int flags)
+{
+	int setsock_option = 0;
+	const char *addrbuf;
+	struct sockaddr *sa_addr;
+	socklen_t addrs_size = 0;
+	int i;
+
+	switch (flags) {
+	case SCTP_BINDX_ADD_ADDR:
+		setsock_option = SCTP_SOCKOPT_BINDX_ADD;
+		break;
+	case SCTP_BINDX_REM_ADDR:
+		setsock_option = SCTP_SOCKOPT_BINDX_REM;
+		break;
+	default:
+		errno = EINVAL;
+		return -1;
+	}
+
+	addrbuf = (char*)addrs;
+	for (i = 0; i < addrcnt; i++) {
+		sa_addr = (struct sockaddr *)addrbuf;
+		switch (sa_addr->sa_family) {
+		case AF_INET:
+			addrs_size += sizeof(struct sockaddr_in);
+			addrbuf += sizeof(struct sockaddr_in);
+			break;
+		case AF_INET6:
+			addrs_size += sizeof(struct sockaddr_in6);
+			addrbuf += sizeof(struct sockaddr_in6);
+			break;
+		default:
+			errno = EINVAL;
+			return -1;
+		}
+	}
+			
+	return setsockopt(fd, SOL_SCTP, setsock_option, addrs, addrs_size);
+}