diff --git a/include/linux/rxrpc.h b/include/linux/rxrpc.h
index f7b826b565c721bfbd823cc485bbfd41f787e332..a53915cd5581d7c7b9c21f334d3a01f093c0a1b4 100644
--- a/include/linux/rxrpc.h
+++ b/include/linux/rxrpc.h
@@ -58,5 +58,12 @@ struct sockaddr_rxrpc {
 #define RXRPC_SECURITY_AUTH	1	/* authenticated packets */
 #define RXRPC_SECURITY_ENCRYPT	2	/* encrypted packets */
 
+/*
+ * RxRPC security indices
+ */
+#define RXRPC_SECURITY_NONE	0	/* no security protocol */
+#define RXRPC_SECURITY_RXKAD	2	/* kaserver or kerberos 4 */
+#define RXRPC_SECURITY_RXGK	4	/* gssapi-based */
+#define RXRPC_SECURITY_RXK5	5	/* kerberos 5 */
 
 #endif /* _LINUX_RXRPC_H */
diff --git a/net/rxrpc/ar-key.c b/net/rxrpc/ar-key.c
index ad8c7a782da1f0daabcd7ff1f9076e1785ae0f23..b3d10e7ccd7e9344a80764f3f1d87f37c4cf68c4 100644
--- a/net/rxrpc/ar-key.c
+++ b/net/rxrpc/ar-key.c
@@ -122,7 +122,7 @@ static int rxrpc_instantiate(struct key *key, const void *data, size_t datalen)
 		       tsec->ticket[6], tsec->ticket[7]);
 
 	ret = -EPROTONOSUPPORT;
-	if (tsec->security_index != 2)
+	if (tsec->security_index != RXRPC_SECURITY_RXKAD)
 		goto error;
 
 	key->type_data.x[0] = tsec->security_index;
@@ -308,7 +308,7 @@ int rxrpc_get_server_data_key(struct rxrpc_connection *conn,
 	_debug("key %d", key_serial(key));
 
 	data.kver = 1;
-	data.tsec.security_index = 2;
+	data.tsec.security_index = RXRPC_SECURITY_RXKAD;
 	data.tsec.ticket_len = 0;
 	data.tsec.expiry = expiry;
 	data.tsec.kvno = 0;
diff --git a/net/rxrpc/rxkad.c b/net/rxrpc/rxkad.c
index ef8f91030a150ff6cb4605c8229dd1955b3528e0..acec76292c01421f1cb7e17f21a9a748b02d1cc0 100644
--- a/net/rxrpc/rxkad.c
+++ b/net/rxrpc/rxkad.c
@@ -42,7 +42,7 @@ struct rxkad_level2_hdr {
 	__be32	checksum;	/* decrypted data checksum */
 };
 
-MODULE_DESCRIPTION("RxRPC network protocol type-2 security (Kerberos)");
+MODULE_DESCRIPTION("RxRPC network protocol type-2 security (Kerberos 4)");
 MODULE_AUTHOR("Red Hat, Inc.");
 MODULE_LICENSE("GPL");
 
@@ -506,7 +506,7 @@ static int rxkad_verify_packet(const struct rxrpc_call *call,
 	if (!call->conn->cipher)
 		return 0;
 
-	if (sp->hdr.securityIndex != 2) {
+	if (sp->hdr.securityIndex != RXRPC_SECURITY_RXKAD) {
 		*_abort_code = RXKADINCONSISTENCY;
 		_leave(" = -EPROTO [not rxkad]");
 		return -EPROTO;
@@ -1122,7 +1122,7 @@ static void rxkad_clear(struct rxrpc_connection *conn)
 static struct rxrpc_security rxkad = {
 	.owner				= THIS_MODULE,
 	.name				= "rxkad",
-	.security_index			= RXKAD_VERSION,
+	.security_index			= RXRPC_SECURITY_RXKAD,
 	.init_connection_security	= rxkad_init_connection_security,
 	.prime_packet_security		= rxkad_prime_packet_security,
 	.secure_packet			= rxkad_secure_packet,