4 files changed, 6 insertions, 0 deletions
diff --git a/src/vnet/session/application_interface.h b/src/vnet/session/application_interface.h
index 3a4f9928d04..ec29d18b59b 100644
--- a/src/vnet/session/application_interface.h
+++ b/src/vnet/session/application_interface.h
@@ -361,6 +361,7 @@ typedef struct session_accepted_msg_
   u64 segment_handle;
   uword vpp_event_queue_address;
   transport_endpoint_t rmt;
+  u8 flags;
 } __clib_packed session_accepted_msg_t;
 
 typedef struct session_accepted_reply_msg_
@@ -386,6 +387,7 @@ typedef struct session_connect_msg_
   u64 parent_handle;
   u32 ckpair_index;
   u8 crypto_engine;
+  u8 flags;
 } __clib_packed session_connect_msg_t;
 
 STATIC_ASSERT (sizeof (session_connect_msg_t) <= SESSION_CTRL_MSG_MAX_SIZE,
diff --git a/src/vnet/session/session_api.c b/src/vnet/session/session_api.c
index 0846e571919..99e00a78bf3 100644
--- a/src/vnet/session/session_api.c
+++ b/src/vnet/session/session_api.c
@@ -196,6 +196,7 @@ mq_send_session_accepted_cb (session_t * s)
   mp->server_rx_fifo = pointer_to_uword (s->rx_fifo);
   mp->server_tx_fifo = pointer_to_uword (s->tx_fifo);
   mp->segment_handle = session_segment_handle (s);
+  mp->flags = s->flags;
 
   if (session_has_transport (s))
     {
diff --git a/src/vnet/session/session_node.c b/src/vnet/session/session_node.c
index 191be7ea3fc..f3ba9e77bcf 100644
--- a/src/vnet/session/session_node.c
+++ b/src/vnet/session/session_node.c
@@ -117,6 +117,7 @@ session_mq_connect_handler (void *data)
   a->sep_ext.parent_handle = mp->parent_handle;
   a->sep_ext.ckpair_index = mp->ckpair_index;
   a->sep_ext.crypto_engine = mp->crypto_engine;
+  a->sep_ext.flags = mp->flags;
   if (mp->hostname_len)
     {
       vec_validate (a->sep_ext.hostname, mp->hostname_len - 1);
diff --git a/src/vnet/session/session_types.h b/src/vnet/session/session_types.h
index 6d7f84f4c3f..16d48431572 100644
--- a/src/vnet/session/session_types.h
+++ b/src/vnet/session/session_types.h
@@ -47,6 +47,7 @@ typedef struct _session_endpoint_cfg
   u64 parent_handle;
   u32 ckpair_index;
   u8 crypto_engine;
+  u8 flags;
 } session_endpoint_cfg_t;
 
 #define SESSION_IP46_ZERO			\
@@ -152,6 +153,7 @@ typedef enum
   _(PROXY, "proxy")					\
   _(CUSTOM_TX, "custom-tx")				\
   _(IS_MIGRATING, "migrating")				\
+  _(UNIDIRECTIONAL, "unidirectional")			\
 
 typedef enum session_flags_bits_
 {