diff --git a/src/core/stellar_core.cpp b/src/core/stellar_core.cpp
index 1252106..eef53c0 100644
--- a/src/core/stellar_core.cpp
+++ b/src/core/stellar_core.cpp
@@ -12,7 +12,7 @@
 #include "utils.h"
 #include "packet_io.h"
 #include "packet_private.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "snowflake.h"
 #include "stellar_stat.h"
 #include "stellar_core.h"
diff --git a/src/plugin/CMakeLists.txt b/src/plugin/CMakeLists.txt
index 3c08c28..d72da69 100644
--- a/src/plugin/CMakeLists.txt
+++ b/src/plugin/CMakeLists.txt
@@ -3,6 +3,6 @@ target_include_directories(plugin_manager PUBLIC ${CMAKE_CURRENT_LIST_DIR})
 target_include_directories(plugin_manager PUBLIC ${CMAKE_SOURCE_DIR}/include/)
 target_include_directories(plugin_manager PUBLIC ${CMAKE_SOURCE_DIR}/src/)
 target_include_directories(plugin_manager PUBLIC ${CMAKE_SOURCE_DIR}/deps/)
-target_link_libraries(plugin_manager bitmap toml ${CMAKE_DL_LIBS})
+target_link_libraries(plugin_manager session_manager bitmap toml ${CMAKE_DL_LIBS})
 
 add_subdirectory(test)
\ No newline at end of file
diff --git a/src/plugin/plugin_manager.cpp b/src/plugin/plugin_manager.cpp
index 42d1cc9..d3527a7 100644
--- a/src/plugin/plugin_manager.cpp
+++ b/src/plugin/plugin_manager.cpp
@@ -5,9 +5,9 @@
 #include "uthash/utlist.h"
 
 #include "core/stellar_core.h"
-#include "session/session_utils.h"
 #include "tuple/tuple.h"
 #include "packet/packet_private.h"
+#include "session/session_private.h"
 
 UT_icd plugin_specs_icd = {sizeof(struct plugin_specific), NULL, NULL, NULL};
 
diff --git a/src/session/CMakeLists.txt b/src/session/CMakeLists.txt
index 3f0f5db..5a5e1df 100644
--- a/src/session/CMakeLists.txt
+++ b/src/session/CMakeLists.txt
@@ -1,5 +1,5 @@
 add_library(session_manager
-    session_utils.cpp
+    session.cpp
     session_pool.cpp
     session_table.cpp
     session_timer.cpp
diff --git a/src/session/session_utils.cpp b/src/session/session.cpp
similarity index 97%
rename from src/session/session_utils.cpp
rename to src/session/session.cpp
index 1a4963a..335f7f3 100644
--- a/src/session/session_utils.cpp
+++ b/src/session/session.cpp
@@ -1,13 +1,6 @@
-#include <assert.h>
-
 #include "session_private.h"
-#include "session_utils.h"
 #include "session_manager.h"
 
-/******************************************************************************
- * session set/get
- ******************************************************************************/
-
 void session_init(struct session *sess)
 {
     memset(sess, 0, sizeof(struct session));
@@ -257,10 +250,6 @@ void session_free_tcp_segment(struct session *sess, struct tcp_segment *seg)
     }
 }
 
-/******************************************************************************
- * to string
- ******************************************************************************/
-
 const char *closing_reason_to_str(enum closing_reason reason)
 {
     switch (reason)
@@ -462,4 +451,11 @@ int session_to_str(const struct session *sess, int bref, char *buff, int size)
     }
 
     return used;
-}
\ No newline at end of file
+}
+
+void session_print(const struct session *sess)
+{
+    char buff[4096];
+    session_to_str(sess, 0, buff, sizeof(buff));
+    printf("%s\n", buff);
+}
diff --git a/src/session/session_manager.cpp b/src/session/session_manager.cpp
index 0c780be..b80ba76 100644
--- a/src/session/session_manager.cpp
+++ b/src/session/session_manager.cpp
@@ -8,7 +8,6 @@
 #include "packet_filter.h"
 #include "snowflake.h"
 #include "session_private.h"
-#include "session_utils.h"
 #include "session_pool.h"
 #include "session_table.h"
 #include "session_timer.h"
diff --git a/src/session/session_manager.h b/src/session/session_manager.h
index 580dda3..ea8509e 100644
--- a/src/session/session_manager.h
+++ b/src/session/session_manager.h
@@ -6,7 +6,7 @@ extern "C"
 #endif
 
 #include "tuple.h"
-#include "session_private.h"
+#include "stellar/session.h"
 
 struct session_manager_options
 {
diff --git a/src/session/session_private.h b/src/session/session_private.h
index c4f0871..c7456aa 100644
--- a/src/session/session_private.h
+++ b/src/session/session_private.h
@@ -75,6 +75,75 @@ struct session
     struct session_manager_stat *mgr_stat;
 };
 
+void session_init(struct session *sess);
+
+void session_set_id(struct session *sess, uint64_t id);
+// uint64_t session_get_id(const struct session *sess);
+
+void session_set_tuple6(struct session *sess, const struct tuple6 *tuple);
+const struct tuple6 *session_get_tuple6(const struct session *sess);
+// const char *session_get0_readable_addr(const struct session *sess);
+
+void session_set_direction(struct session *sess, enum session_direction dir);
+enum session_direction session_get_direction(const struct session *sess);
+
+void session_set_current_flow_direction(struct session *sess, enum flow_direction dir);
+// enum flow_direction session_get_current_flow_direction(const struct session *sess);
+
+void session_set_current_state(struct session *sess, enum session_state state);
+// enum session_state session_get_current_state(const struct session *sess);
+
+void session_set_type(struct session *sess, enum session_type type);
+// enum session_type session_get_type(const struct session *sess);
+
+void session_set_duplicate_traffic(struct session *sess);
+// int session_has_duplicate_traffic(const struct session *sess);
+
+void session_set_closing_reason(struct session *sess, enum closing_reason reason);
+// enum closing_reason session_get_closing_reason(const struct session *sess);
+
+void session_inc_stat(struct session *sess, enum flow_direction dir, enum session_stat stat, uint64_t val);
+// uint64_t session_get_stat(const struct session *sess, enum flow_direction dir, enum session_stat stat);
+
+void session_set_timestamp(struct session *sess, enum session_timestamp type, uint64_t value);
+// uint64_t session_get_timestamp(const struct session *sess, enum session_timestamp type);
+
+void session_clear_sids(struct session *sess, enum flow_direction dir);
+void session_set_sids(struct session *sess, enum flow_direction dir, const struct sids *sids);
+const struct sids *session_get_sids(const struct session *sess, enum flow_direction dir);
+
+void session_clear_route_ctx(struct session *sess, enum flow_direction dir);
+void session_set_route_ctx(struct session *sess, enum flow_direction dir, const struct route_ctx *ctx);
+const struct route_ctx *session_get_route_ctx(const struct session *sess, enum flow_direction dir);
+
+void session_set_first_packet(struct session *sess, enum flow_direction dir, const struct packet *pkt);
+// const struct packet *session_get_first_packet(const struct session *sess, enum flow_direction dir);
+
+void session_set_current_packet(struct session *sess, const struct packet *pkt);
+// const struct packet *session_get0_current_packet(const struct session *sess);
+
+// int session_is_symmetric(const struct session *sess, unsigned char *flag);
+
+void session_set_user_data(struct session *sess, void *user_data);
+void *session_get_user_data(const struct session *sess);
+
+struct tcp_segment *session_get_tcp_segment(struct session *sess);
+void session_free_tcp_segment(struct session *sess, struct tcp_segment *seg);
+
+/******************************************************************************
+ * to string
+ ******************************************************************************/
+
+const char *closing_reason_to_str(enum closing_reason reason);
+const char *session_state_to_str(enum session_state state);
+const char *session_type_to_str(enum session_type type);
+const char *flow_direction_to_str(enum flow_direction dir);
+
+// bref : 1, output session bref info
+// bref : 0, output session detail info
+int session_to_str(const struct session *sess, int bref, char *buff, int size);
+void session_print(const struct session *sess);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/session/session_transition.cpp b/src/session/session_transition.cpp
index cd439eb..256d61a 100644
--- a/src/session/session_transition.cpp
+++ b/src/session/session_transition.cpp
@@ -2,7 +2,7 @@
 #include <assert.h>
 
 #include "log.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "session_transition.h"
 
 #define SESSION_TRANSITION_LOG_INFO(format, ...) LOG_INFO("session transition", format, ##__VA_ARGS__)
diff --git a/src/session/session_utils.h b/src/session/session_utils.h
deleted file mode 100644
index e4222c0..0000000
--- a/src/session/session_utils.h
+++ /dev/null
@@ -1,113 +0,0 @@
-#pragma once
-
-#ifdef __cplusplus
-extern "C"
-{
-#endif
-
-#include <stdint.h>
-#include <stdio.h>
-
-#include "stellar/session.h"
-
-/******************************************************************************
- * session set/get
- ******************************************************************************/
-
-void session_init(struct session *sess);
-
-// session ID
-void session_set_id(struct session *sess, uint64_t id);
-uint64_t session_get_id(const struct session *sess);
-
-// session tuple
-void session_set_tuple6(struct session *sess, const struct tuple6 *tuple);
-const struct tuple6 *session_get_tuple6(const struct session *sess);
-
-// session tuple direction
-const char *session_get0_readable_addr(const struct session *sess);
-
-// session direction
-void session_set_direction(struct session *sess, enum session_direction dir);
-enum session_direction session_get_direction(const struct session *sess);
-
-// session flow direction
-void session_set_current_flow_direction(struct session *sess, enum flow_direction dir);
-enum flow_direction session_get_current_flow_direction(const struct session *sess);
-
-// session state
-void session_set_current_state(struct session *sess, enum session_state state);
-enum session_state session_get_current_state(const struct session *sess);
-
-// session type
-void session_set_type(struct session *sess, enum session_type type);
-enum session_type session_get_type(const struct session *sess);
-
-// session seen duplicate traffic
-void session_set_duplicate_traffic(struct session *sess);
-int session_has_duplicate_traffic(const struct session *sess);
-
-// session closing reason
-void session_set_closing_reason(struct session *sess, enum closing_reason reason);
-enum closing_reason session_get_closing_reason(const struct session *sess);
-
-// session stat
-void session_inc_stat(struct session *sess, enum flow_direction dir, enum session_stat stat, uint64_t val);
-uint64_t session_get_stat(const struct session *sess, enum flow_direction dir, enum session_stat stat);
-
-// session timestamp
-void session_set_timestamp(struct session *sess, enum session_timestamp type, uint64_t value);
-uint64_t session_get_timestamp(const struct session *sess, enum session_timestamp type);
-
-// session sids
-void session_clear_sids(struct session *sess, enum flow_direction dir);
-void session_set_sids(struct session *sess, enum flow_direction dir, const struct sids *sids);
-const struct sids *session_get_sids(const struct session *sess, enum flow_direction dir);
-
-// session route ctx
-void session_clear_route_ctx(struct session *sess, enum flow_direction dir);
-void session_set_route_ctx(struct session *sess, enum flow_direction dir, const struct route_ctx *ctx);
-const struct route_ctx *session_get_route_ctx(const struct session *sess, enum flow_direction dir);
-
-// session first packet
-void session_set_first_packet(struct session *sess, enum flow_direction dir, const struct packet *pkt);
-const struct packet *session_get_first_packet(const struct session *sess, enum flow_direction dir);
-
-// session current packet
-void session_set_current_packet(struct session *sess, const struct packet *pkt);
-const struct packet *session_get0_current_packet(const struct session *sess);
-
-// session symmetric
-int session_is_symmetric(const struct session *sess, unsigned char *flag);
-
-// session user data
-void session_set_user_data(struct session *sess, void *user_data);
-void *session_get_user_data(const struct session *sess);
-
-// session tcp segment
-struct tcp_segment *session_get_tcp_segment(struct session *sess);
-void session_free_tcp_segment(struct session *sess, struct tcp_segment *seg);
-
-/******************************************************************************
- * to string
- ******************************************************************************/
-
-const char *closing_reason_to_str(enum closing_reason reason);
-const char *session_state_to_str(enum session_state state);
-const char *session_type_to_str(enum session_type type);
-const char *flow_direction_to_str(enum flow_direction dir);
-
-// bref : 1, output session bref info
-// bref : 0, output session detail info
-int session_to_str(const struct session *sess, int bref, char *buff, int size);
-
-static inline void session_print(const struct session *sess)
-{
-    char buff[4096];
-    session_to_str(sess, 0, buff, sizeof(buff));
-    printf("%s\n", buff);
-}
-
-#ifdef __cplusplus
-}
-#endif
diff --git a/src/session/test/gtest_case_tcp_fast_open.cpp b/src/session/test/gtest_case_tcp_fast_open.cpp
index d1c0f89..4216655 100644
--- a/src/session/test/gtest_case_tcp_fast_open.cpp
+++ b/src/session/test/gtest_case_tcp_fast_open.cpp
@@ -4,7 +4,7 @@
 #include "packet_private.h"
 #include "packet_parser.h"
 #include "snowflake.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "session_manager.h"
 #include "tcp_reassembly.h"
 
diff --git a/src/session/test/gtest_filter_tcp_dupkt.cpp b/src/session/test/gtest_filter_tcp_dupkt.cpp
index f6daaa9..b3e5a8a 100644
--- a/src/session/test/gtest_filter_tcp_dupkt.cpp
+++ b/src/session/test/gtest_filter_tcp_dupkt.cpp
@@ -3,7 +3,7 @@
 #include "packet_helper.h"
 #include "packet_private.h"
 #include "packet_parser.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "session_manager.h"
 #include "test_packets.h"
 
diff --git a/src/session/test/gtest_overload_evict_tcp_sess.cpp b/src/session/test/gtest_overload_evict_tcp_sess.cpp
index 5a7fe93..5477bc3 100644
--- a/src/session/test/gtest_overload_evict_tcp_sess.cpp
+++ b/src/session/test/gtest_overload_evict_tcp_sess.cpp
@@ -4,7 +4,7 @@
 #include "packet_helper.h"
 #include "packet_private.h"
 #include "packet_parser.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "session_manager.h"
 #include "test_packets.h"
 
diff --git a/src/session/test/gtest_overload_evict_udp_sess.cpp b/src/session/test/gtest_overload_evict_udp_sess.cpp
index 388e424..560d7db 100644
--- a/src/session/test/gtest_overload_evict_udp_sess.cpp
+++ b/src/session/test/gtest_overload_evict_udp_sess.cpp
@@ -4,7 +4,7 @@
 #include "packet_helper.h"
 #include "packet_private.h"
 #include "packet_parser.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "session_manager.h"
 #include "test_packets.h"
 
diff --git a/src/session/test/gtest_sess_mgr_scan.cpp b/src/session/test/gtest_sess_mgr_scan.cpp
index 2b7aae0..6e6643c 100644
--- a/src/session/test/gtest_sess_mgr_scan.cpp
+++ b/src/session/test/gtest_sess_mgr_scan.cpp
@@ -1,7 +1,7 @@
 #include <gtest/gtest.h>
 
 #include "snowflake.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "session_manager.h"
 #include "packet_private.h"
 #include "packet_parser.h"
diff --git a/src/session/test/gtest_sess_mgr_tcp_reassembly.cpp b/src/session/test/gtest_sess_mgr_tcp_reassembly.cpp
index 612b2d5..f92a6db 100644
--- a/src/session/test/gtest_sess_mgr_tcp_reassembly.cpp
+++ b/src/session/test/gtest_sess_mgr_tcp_reassembly.cpp
@@ -3,7 +3,7 @@
 #include "packet_helper.h"
 #include "packet_private.h"
 #include "packet_parser.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "session_manager.h"
 #include "tcp_reassembly.h"
 #include "test_packets.h"
diff --git a/src/session/test/gtest_session_table.cpp b/src/session/test/gtest_session_table.cpp
index 2a701c1..b99d2aa 100644
--- a/src/session/test/gtest_session_table.cpp
+++ b/src/session/test/gtest_session_table.cpp
@@ -1,7 +1,7 @@
 #include <gtest/gtest.h>
 
 #include "tuple.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "session_pool.h"
 #include "session_table.h"
 
diff --git a/src/session/test/gtest_session_timer.cpp b/src/session/test/gtest_session_timer.cpp
index 7c5ff26..1a21d87 100644
--- a/src/session/test/gtest_session_timer.cpp
+++ b/src/session/test/gtest_session_timer.cpp
@@ -1,7 +1,6 @@
 #include <gtest/gtest.h>
 
 #include "session_private.h"
-#include "session_utils.h"
 #include "session_timer.h"
 
 TEST(SESSION_TIMER, EXPIRE)
diff --git a/src/session/test/gtest_state_tcp_active_to_closing.cpp b/src/session/test/gtest_state_tcp_active_to_closing.cpp
index 49747c1..dab4d6a 100644
--- a/src/session/test/gtest_state_tcp_active_to_closing.cpp
+++ b/src/session/test/gtest_state_tcp_active_to_closing.cpp
@@ -6,7 +6,7 @@
 #include "packet_private.h"
 #include "packet_parser.h"
 #include "snowflake.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "session_manager.h"
 #include "test_packets.h"
 
diff --git a/src/session/test/gtest_state_tcp_init_to_opening.cpp b/src/session/test/gtest_state_tcp_init_to_opening.cpp
index 8fe3fbe..ec62306 100644
--- a/src/session/test/gtest_state_tcp_init_to_opening.cpp
+++ b/src/session/test/gtest_state_tcp_init_to_opening.cpp
@@ -6,7 +6,7 @@
 #include "packet_private.h"
 #include "packet_parser.h"
 #include "snowflake.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "session_manager.h"
 #include "test_packets.h"
 
diff --git a/src/session/test/gtest_state_tcp_init_to_opening_to_active_to_closing_to_closed.cpp b/src/session/test/gtest_state_tcp_init_to_opening_to_active_to_closing_to_closed.cpp
index 1c16735..215cab9 100644
--- a/src/session/test/gtest_state_tcp_init_to_opening_to_active_to_closing_to_closed.cpp
+++ b/src/session/test/gtest_state_tcp_init_to_opening_to_active_to_closing_to_closed.cpp
@@ -5,7 +5,7 @@
 #include "packet_private.h"
 #include "packet_parser.h"
 #include "snowflake.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "session_manager.h"
 #include "test_packets.h"
 
diff --git a/src/session/test/gtest_state_tcp_opening_to_active.cpp b/src/session/test/gtest_state_tcp_opening_to_active.cpp
index 794a74b..f49916a 100644
--- a/src/session/test/gtest_state_tcp_opening_to_active.cpp
+++ b/src/session/test/gtest_state_tcp_opening_to_active.cpp
@@ -5,7 +5,7 @@
 #include "packet_private.h"
 #include "packet_parser.h"
 #include "snowflake.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "session_manager.h"
 #include "test_packets.h"
 
diff --git a/src/session/test/gtest_state_tcp_opening_to_closing.cpp b/src/session/test/gtest_state_tcp_opening_to_closing.cpp
index f1041d0..acb431c 100644
--- a/src/session/test/gtest_state_tcp_opening_to_closing.cpp
+++ b/src/session/test/gtest_state_tcp_opening_to_closing.cpp
@@ -6,7 +6,7 @@
 #include "packet_private.h"
 #include "packet_parser.h"
 #include "snowflake.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "session_manager.h"
 #include "test_packets.h"
 
diff --git a/src/session/test/gtest_state_udp_init_to_opening_to_active_to_closing.cpp b/src/session/test/gtest_state_udp_init_to_opening_to_active_to_closing.cpp
index 325d548..bc0ec50 100644
--- a/src/session/test/gtest_state_udp_init_to_opening_to_active_to_closing.cpp
+++ b/src/session/test/gtest_state_udp_init_to_opening_to_active_to_closing.cpp
@@ -5,7 +5,7 @@
 #include "packet_private.h"
 #include "packet_parser.h"
 #include "snowflake.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "session_manager.h"
 #include "test_packets.h"
 
diff --git a/src/session/test/gtest_state_udp_init_to_opening_to_closing.cpp b/src/session/test/gtest_state_udp_init_to_opening_to_closing.cpp
index 14dc8c4..f555137 100644
--- a/src/session/test/gtest_state_udp_init_to_opening_to_closing.cpp
+++ b/src/session/test/gtest_state_udp_init_to_opening_to_closing.cpp
@@ -5,7 +5,7 @@
 #include "packet_private.h"
 #include "packet_parser.h"
 #include "snowflake.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "session_manager.h"
 #include "test_packets.h"
 
diff --git a/src/session/test/gtest_timeout_tcp_data.cpp b/src/session/test/gtest_timeout_tcp_data.cpp
index 83638b8..6037517 100644
--- a/src/session/test/gtest_timeout_tcp_data.cpp
+++ b/src/session/test/gtest_timeout_tcp_data.cpp
@@ -3,7 +3,7 @@
 #include "tuple.h"
 #include "packet_private.h"
 #include "packet_parser.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "session_manager.h"
 #include "test_packets.h"
 
diff --git a/src/session/test/gtest_timeout_tcp_handshake.cpp b/src/session/test/gtest_timeout_tcp_handshake.cpp
index a14cedd..638c53f 100644
--- a/src/session/test/gtest_timeout_tcp_handshake.cpp
+++ b/src/session/test/gtest_timeout_tcp_handshake.cpp
@@ -3,7 +3,7 @@
 #include "tuple.h"
 #include "packet_private.h"
 #include "packet_parser.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "session_manager.h"
 #include "test_packets.h"
 
diff --git a/src/session/test/gtest_timeout_tcp_init.cpp b/src/session/test/gtest_timeout_tcp_init.cpp
index d4eb05f..6e12406 100644
--- a/src/session/test/gtest_timeout_tcp_init.cpp
+++ b/src/session/test/gtest_timeout_tcp_init.cpp
@@ -3,7 +3,7 @@
 #include "tuple.h"
 #include "packet_private.h"
 #include "packet_parser.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "session_manager.h"
 #include "test_packets.h"
 
diff --git a/src/session/test/gtest_timeout_udp_data.cpp b/src/session/test/gtest_timeout_udp_data.cpp
index 3ce5d1c..d815ffb 100644
--- a/src/session/test/gtest_timeout_udp_data.cpp
+++ b/src/session/test/gtest_timeout_udp_data.cpp
@@ -3,7 +3,7 @@
 #include "tuple.h"
 #include "packet_private.h"
 #include "packet_parser.h"
-#include "session_utils.h"
+#include "session_private.h"
 #include "session_manager.h"
 #include "test_packets.h"
 
diff --git a/test/debug_plugin/debug_plugin.cpp b/test/debug_plugin/debug_plugin.cpp
index e2954f0..8016b1b 100644
--- a/test/debug_plugin/debug_plugin.cpp
+++ b/test/debug_plugin/debug_plugin.cpp
@@ -10,8 +10,9 @@
 #include <arpa/inet.h>
 
 #include "utils.h"
-#include "session_utils.h"
 #include "packet_dump.h"
+#include "session_private.h"
+#include "stellar/session.h"
 #include "stellar/packet.h"
 #include "stellar/stellar_mq.h"
 #include "stellar/stellar_exdata.h"