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diff --git a/src/vnet/session/stream_session.h b/src/vnet/session/stream_session.h
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+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SRC_VNET_SESSION_STREAM_SESSION_H_
+#define SRC_VNET_SESSION_STREAM_SESSION_H_
+
+#include <vnet/vnet.h>
+#include <svm/svm_fifo.h>
+
+#define foreach_session_type                    \
+  _(IP4_TCP, ip4_tcp)                           \
+  _(IP4_UDP, ip4_udp)                           \
+  _(IP6_TCP, ip6_tcp)                           \
+  _(IP6_UDP, ip6_udp)
+
+typedef enum
+{
+#define _(A, a) SESSION_TYPE_##A,
+  foreach_session_type
+#undef _
+    SESSION_N_TYPES,
+} session_type_t;
+
+/*
+ * Application session state
+ */
+typedef enum
+{
+  SESSION_STATE_LISTENING,
+  SESSION_STATE_CONNECTING,
+  SESSION_STATE_ACCEPTING,
+  SESSION_STATE_READY,
+  SESSION_STATE_CLOSED,
+  SESSION_STATE_N_STATES,
+} stream_session_state_t;
+
+typedef struct _stream_session_t
+{
+  /** fifo pointers. Once allocated, these do not move */
+  svm_fifo_t *server_rx_fifo;
+  svm_fifo_t *server_tx_fifo;
+
+  /** Type */
+  u8 session_type;
+
+  /** State */
+  volatile u8 session_state;
+
+  u8 thread_index;
+
+  /** To avoid n**2 "one event per frame" check */
+  u8 enqueue_epoch;
+
+  /** svm segment index where fifos were allocated */
+  u32 svm_segment_index;
+
+  /** Session index in per_thread pool */
+  u32 session_index;
+
+  /** Transport specific */
+  u32 connection_index;
+
+  /** stream server pool index */
+  u32 app_index;
+
+  /** Parent listener session if the result of an accept */
+  u32 listener_index;
+
+    CLIB_CACHE_LINE_ALIGN_MARK (pad);
+} stream_session_t;
+
+#endif /* SRC_VNET_SESSION_STREAM_SESSION_H_ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */