diff --git a/include/types/session.h b/include/types/session.h
index 7539c0c..f1b7451 100644
--- a/include/types/session.h
+++ b/include/types/session.h
@@ -50,7 +50,7 @@
 #define SN_FORCE_PRST	0x00000010	/* force persistence here, even if server is down */
 #define SN_MONITOR	0x00000020	/* this session comes from a monitoring system */
 #define SN_CURR_SESS	0x00000040	/* a connection is currently being counted on the server */
-#define SN_FRT_ADDR_SET	0x00000080	/* set if the frontend address has been filled */
+/* unused: 0x00000080 */
 #define SN_REDISP	0x00000100	/* set if this session was redispatched from one server to another */
 #define SN_CONN_TAR	0x00000200	/* set if this session is turning around before reconnecting */
 #define SN_REDIRECTABLE	0x00000400	/* set if this session is redirectable (GET or HEAD) */
@@ -84,7 +84,6 @@
 #define SN_IGNORE_PRST	0x00080000	/* ignore persistence */
 #define SN_BE_TRACK_SC1 0x00100000	/* backend tracks stick-counter 1 */
 #define SN_BE_TRACK_SC2 0x00200000	/* backend tracks stick-counter 2 */
-#define SN_BCK_ADDR_SET 0x00400000 	/* set if the backend address has been filled */
 
 /* Termination sequence tracing.
  *
diff --git a/include/types/stream_interface.h b/include/types/stream_interface.h
index dae36ef..271abc7 100644
--- a/include/types/stream_interface.h
+++ b/include/types/stream_interface.h
@@ -133,6 +133,8 @@
 	void (*chk_snd)(struct stream_interface *);/* chk_snd function */
 	int  (*connect)(struct stream_interface *); /* connect function if any */
 	void (*release)(struct stream_interface *); /* handler to call after the last close() */
+	int (*get_src)(int, struct sockaddr *, socklen_t *); /* syscall used to retrieve src addr */
+	int (*get_dst)(int, struct sockaddr *, socklen_t *); /* syscall used to retrieve dst addr */
 
 	/* struct members below are the "remote" part, as seen from the buffer side */
 	struct target target;	/* the target to connect to (server, proxy, applet, ...) */