3 files changed, 6 insertions, 0 deletions
diff --git a/flow.c b/flow.c
index feefda3..a57d7b9 100644
--- a/flow.c
+++ b/flow.c
@@ -449,6 +449,7 @@ struct flowside *flow_target(const struct ctx *c, union flow *flow,
 
 	switch (f->pif[INISIDE]) {
 	case PIF_TAP:
+		memcpy(f->tap_omac, MAC_UNDEF, ETH_ALEN);
 		tgtpif = fwd_nat_from_tap(c, proto, ini, tgt);
 		break;
 
@@ -458,6 +459,7 @@ struct flowside *flow_target(const struct ctx *c, union flow *flow,
 
 	case PIF_HOST:
 		tgtpif = fwd_nat_from_host(c, proto, ini, tgt);
+		fwd_neigh_mac_get(c, &tgt->oaddr, f->tap_omac);
 		break;
 
 	default:
diff --git a/flow.h b/flow.h
index cac618a..f342895 100644
--- a/flow.h
+++ b/flow.h
@@ -177,6 +177,7 @@ int flowside_connect(const struct ctx *c, int s,
  * @type:	Type of packet flow
  * @pif[]:	Interface for each side of the flow
  * @side[]:	Information for each side of the flow
+ * @tap_omac: MAC address of remote endpoint as seen from the guest
  */
 struct flow_common {
 #ifdef __GNUC__
@@ -192,6 +193,7 @@ struct flow_common {
 #endif
 	uint8_t		pif[SIDES];
 	struct flowside	side[SIDES];
+	uint8_t		tap_omac[6];
 };
 
 #define FLOW_INDEX_BITS		17	/* 128k - 1 */
diff --git a/util.h b/util.h
index 22eaac5..6fc8f5d 100644
--- a/util.h
+++ b/util.h
@@ -101,6 +101,8 @@ void abort_with_msg(const char *fmt, ...)
 	((uint8_t [ETH_ALEN]){ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff })
 #define MAC_ZERO		((uint8_t [ETH_ALEN]){ 0 })
 #define MAC_IS_ZERO(addr)	(!memcmp((addr), MAC_ZERO, ETH_ALEN))
+#define MAC_UNDEF		MAC_BROADCAST
+#define MAC_IS_UNDEF(addr)	(!memcmp((addr), MAC_UNDEF, ETH_ALEN))
 
 #ifndef __bswap_constant_16
 #define __bswap_constant_16(x)						\