diff --git a/src/ip_reassembly/ip_reassembly.cpp b/src/ip_reassembly/ip_reassembly.cpp
index d9275d9..24d1b63 100644
--- a/src/ip_reassembly/ip_reassembly.cpp
+++ b/src/ip_reassembly/ip_reassembly.cpp
@@ -7,7 +7,6 @@
 #include "checksum.h"
 #include "crc32_hash.h"
 #include "packet_private.h"
-#include "packet_utils.h"
 #include "packet_parser.h"
 #include "packet_helper.h"
 #include "ip_reassembly.h"
diff --git a/src/ip_reassembly/test/gtest_utils.h b/src/ip_reassembly/test/gtest_utils.h
index c426168..a7177d0 100644
--- a/src/ip_reassembly/test/gtest_utils.h
+++ b/src/ip_reassembly/test/gtest_utils.h
@@ -11,7 +11,6 @@ extern "C"
 #include "ip_reassembly.h"
 #include "packet_private.h"
 #include "packet_dump.h"
-#include "packet_utils.h"
 #include "packet_parser.h"
 #include "packet_layer.h"
 
diff --git a/src/packet/CMakeLists.txt b/src/packet/CMakeLists.txt
index 4368964..ce1d71f 100644
--- a/src/packet/CMakeLists.txt
+++ b/src/packet/CMakeLists.txt
@@ -1,9 +1,9 @@
 add_library(packet
+    packet.cpp
     packet_parser.cpp
     packet_builder.cpp
     packet_filter.cpp
     packet_dump.cpp
-    packet_utils.cpp
     packet_ldbc.cpp
     packet_layer.cpp
     packet_tunnel.cpp
diff --git a/src/packet/packet_utils.cpp b/src/packet/packet.cpp
similarity index 96%
rename from src/packet/packet_utils.cpp
rename to src/packet/packet.cpp
index d9f8107..75583be 100644
--- a/src/packet/packet_utils.cpp
+++ b/src/packet/packet.cpp
@@ -4,14 +4,33 @@
 #include "tuple.h"
 #include "packet_helper.h"
 #include "packet_private.h"
-#include "packet_utils.h"
 
-#define PACKET_UTILS_LOG_ERROR(format, ...) LOG_ERROR("packet utils", format, ##__VA_ARGS__)
+#define PACKET_LOG_ERROR(format, ...) LOG_ERROR("packet", format, ##__VA_ARGS__)
 
 /******************************************************************************
  * metadata utils
  ******************************************************************************/
 
+void packet_set_route_ctx(struct packet *pkt, const struct route_ctx *ctx)
+{
+    pkt->meta.route_ctx = *ctx;
+}
+
+const struct route_ctx *packet_get_route_ctx(const struct packet *pkt)
+{
+    return &pkt->meta.route_ctx;
+}
+
+void packet_set_origin_ctx(struct packet *pkt, void *ctx)
+{
+    pkt->meta.origin_ctx = ctx;
+}
+
+const void *packet_get_origin_ctx(const struct packet *pkt)
+{
+    return pkt->meta.origin_ctx;
+}
+
 void packet_set_sids(struct packet *pkt, const struct sids *sids)
 {
     pkt->meta.sids = *sids;
@@ -26,7 +45,7 @@ void packet_prepend_sids(struct packet *pkt, const struct sids *sids)
 {
     if (pkt->meta.sids.used + sids->used > MAX_SIDS)
     {
-        PACKET_UTILS_LOG_ERROR("sids overflow");
+        PACKET_LOG_ERROR("sids overflow");
         return;
     }
     else
diff --git a/src/packet/packet_builder.cpp b/src/packet/packet_builder.cpp
index ad10192..27be1ef 100644
--- a/src/packet/packet_builder.cpp
+++ b/src/packet/packet_builder.cpp
@@ -4,7 +4,6 @@
 #include "checksum.h"
 #include "packet_private.h"
 #include "packet_helper.h"
-#include "packet_utils.h"
 #include "packet_layer.h"
 #include "packet_parser.h"
 #include "packet_builder.h"
diff --git a/src/packet/packet_dump.cpp b/src/packet/packet_dump.cpp
index be3ca67..7abacd1 100644
--- a/src/packet/packet_dump.cpp
+++ b/src/packet/packet_dump.cpp
@@ -10,7 +10,6 @@
 #include "packet_private.h"
 #include "packet_dump.h"
 #include "packet_parser.h"
-#include "packet_utils.h"
 
 #define PACKET_DUMP_LOG_ERROR(format, ...) LOG_ERROR("packet dump", format, ##__VA_ARGS__)
 
diff --git a/src/packet/packet_layer.cpp b/src/packet/packet_layer.cpp
index d3b29f9..ac7a267 100644
--- a/src/packet/packet_layer.cpp
+++ b/src/packet/packet_layer.cpp
@@ -1,6 +1,5 @@
 #include "packet_private.h"
 #include "packet_layer.h"
-#include "packet_utils.h"
 
 int packet_get_layer_count(const struct packet *pkt)
 {
diff --git a/src/packet/packet_ldbc.cpp b/src/packet/packet_ldbc.cpp
index 0597a23..1e84953 100644
--- a/src/packet/packet_ldbc.cpp
+++ b/src/packet/packet_ldbc.cpp
@@ -1,8 +1,7 @@
 #include "tuple.h"
 #include "uthash.h"
 #include "packet_ldbc.h"
-#include "packet_utils.h"
-
+#include "packet_private.h"
 uint64_t packet_ldbc_hash(const struct packet *pkt, enum load_balance ldbc, enum packet_direction direction)
 {
     uint64_t temp = 0;
diff --git a/src/packet/packet_private.h b/src/packet/packet_private.h
index 774b67d..6cbf2c7 100644
--- a/src/packet/packet_private.h
+++ b/src/packet/packet_private.h
@@ -58,25 +58,65 @@ struct packet
     struct metadata meta;
 };
 
-inline void packet_set_route_ctx(struct packet *pkt, const struct route_ctx *ctx)
-{
-    pkt->meta.route_ctx = *ctx;
-}
+/******************************************************************************
+ * metadata utils
+ ******************************************************************************/
 
-inline const struct route_ctx *packet_get_route_ctx(const struct packet *pkt)
-{
-    return &pkt->meta.route_ctx;
-}
+void packet_set_route_ctx(struct packet *pkt, const struct route_ctx *ctx);
+const struct route_ctx *packet_get_route_ctx(const struct packet *pkt);
 
-inline void packet_set_origin_ctx(struct packet *pkt, void *ctx)
-{
-    pkt->meta.origin_ctx = ctx;
-}
+void packet_set_origin_ctx(struct packet *pkt, void *ctx);
+const void *packet_get_origin_ctx(const struct packet *pkt);
 
-inline const void *packet_get_origin_ctx(const struct packet *pkt)
-{
-    return pkt->meta.origin_ctx;
-}
+void packet_set_sids(struct packet *pkt, const struct sids *sids);
+const struct sids *packet_get_sids(const struct packet *pkt);
+
+void packet_set_session_id(struct packet *pkt, uint64_t id);
+uint64_t packet_get_session_id(const struct packet *pkt);
+
+void packet_set_domain(struct packet *pkt, uint64_t domain);
+uint64_t packet_get_domain(const struct packet *pkt);
+
+void packet_set_link_id(struct packet *pkt, uint16_t id);
+uint16_t packet_get_link_id(const struct packet *pkt);
+
+void packet_set_ctrl(struct packet *pkt, uint8_t ctrl);
+uint8_t packet_is_ctrl(const struct packet *pkt);
+
+void packet_set_direction(struct packet *pkt, enum packet_direction dir);
+
+void *packet_get_user_data(struct packet *pkt);
+void packet_set_user_data(struct packet *pkt, void *data);
+
+/******************************************************************************
+ * tuple uitls
+ ******************************************************************************/
+
+// return  0: found
+// return -1: not found
+int packet_get_innermost_tuple2(const struct packet *pkt, struct tuple2 *tuple);
+int packet_get_outermost_tuple2(const struct packet *pkt, struct tuple2 *tuple);
+
+// return  0: found
+// return -1: not found
+int packet_get_innermost_tuple4(const struct packet *pkt, struct tuple4 *tuple);
+int packet_get_outermost_tuple4(const struct packet *pkt, struct tuple4 *tuple);
+
+// return  0: found
+// return -1: not found
+int packet_get_innermost_tuple6(const struct packet *pkt, struct tuple6 *tuple);
+int packet_get_outermost_tuple6(const struct packet *pkt, struct tuple6 *tuple);
+
+/******************************************************************************
+ * other uitls
+ ******************************************************************************/
+
+struct packet *packet_new(uint16_t pkt_len);
+struct packet *packet_dup(const struct packet *pkt);
+void packet_free(struct packet *pkt);
+
+int packet_is_fragment(const struct packet *pkt);
+void layer_convert(const struct raw_layer *in, struct layer *out);
 
 #ifdef __cplusplus
 }
diff --git a/src/packet/packet_tunnel.cpp b/src/packet/packet_tunnel.cpp
index 392ad46..c6edc21 100644
--- a/src/packet/packet_tunnel.cpp
+++ b/src/packet/packet_tunnel.cpp
@@ -2,7 +2,6 @@
 
 #include "stellar/tunnel.h"
 #include "packet_private.h"
-#include "packet_utils.h"
 #include "packet_layer.h"
 
 struct tunnel_detector
diff --git a/src/packet/packet_utils.h b/src/packet/packet_utils.h
deleted file mode 100644
index aa9315d..0000000
--- a/src/packet/packet_utils.h
+++ /dev/null
@@ -1,78 +0,0 @@
-#pragma once
-
-#ifdef __cplusplus
-extern "C"
-{
-#endif
-
-#include <stdint.h>
-#include "stellar/packet.h"
-
-/******************************************************************************
- * metadata utils
- ******************************************************************************/
-
-void packet_set_sids(struct packet *pkt, const struct sids *sids);
-const struct sids *packet_get_sids(const struct packet *pkt);
-void packet_prepend_sids(struct packet *pkt, const struct sids *sids);
-
-void packet_set_session_id(struct packet *pkt, uint64_t id);
-uint64_t packet_get_session_id(const struct packet *pkt);
-
-void packet_set_domain(struct packet *pkt, uint64_t domain);
-uint64_t packet_get_domain(const struct packet *pkt);
-
-void packet_set_link_id(struct packet *pkt, uint16_t id);
-uint16_t packet_get_link_id(const struct packet *pkt);
-
-void packet_set_ctrl(struct packet *pkt, uint8_t ctrl);
-uint8_t packet_is_ctrl(const struct packet *pkt);
-
-void packet_set_direction(struct packet *pkt, enum packet_direction dir);
-enum packet_direction packet_get_direction(const struct packet *pkt);
-
-void packet_set_action(struct packet *pkt, enum packet_action action);
-enum packet_action packet_get_action(const struct packet *pkt);
-
-void *packet_get_user_data(struct packet *pkt);
-void packet_set_user_data(struct packet *pkt, void *data);
-
-/******************************************************************************
- * tuple uitls
- ******************************************************************************/
-
-// return  0: found
-// return -1: not found
-int packet_get_innermost_tuple2(const struct packet *pkt, struct tuple2 *tuple);
-int packet_get_outermost_tuple2(const struct packet *pkt, struct tuple2 *tuple);
-
-// return  0: found
-// return -1: not found
-int packet_get_innermost_tuple4(const struct packet *pkt, struct tuple4 *tuple);
-int packet_get_outermost_tuple4(const struct packet *pkt, struct tuple4 *tuple);
-
-// return  0: found
-// return -1: not found
-int packet_get_innermost_tuple6(const struct packet *pkt, struct tuple6 *tuple);
-int packet_get_outermost_tuple6(const struct packet *pkt, struct tuple6 *tuple);
-
-/******************************************************************************
- * other uitls
- ******************************************************************************/
-
-const char *packet_get_raw_data(const struct packet *pkt);
-uint16_t packet_get_raw_len(const struct packet *pkt);
-
-const char *packet_get_payload(const struct packet *pkt);
-uint16_t packet_get_payload_len(const struct packet *pkt);
-
-struct packet *packet_new(uint16_t pkt_len);
-struct packet *packet_dup(const struct packet *pkt);
-void packet_free(struct packet *pkt);
-
-int packet_is_fragment(const struct packet *pkt);
-void layer_convert(const struct raw_layer *in, struct layer *out);
-
-#ifdef __cplusplus
-}
-#endif
diff --git a/src/packet/test/gtest_packet_builder.cpp b/src/packet/test/gtest_packet_builder.cpp
index 8e4f021..223f586 100644
--- a/src/packet/test/gtest_packet_builder.cpp
+++ b/src/packet/test/gtest_packet_builder.cpp
@@ -8,7 +8,6 @@
 #include "packet_layer.h"
 #include "packet_parser.h"
 #include "packet_builder.h"
-#include "packet_utils.h"
 
 #define PRINT_GREEN(fmt, ...) printf("\033[0;32m" fmt "\033[0m\n", ##__VA_ARGS__)
 #define PRINT_RED(fmt, ...) printf("\033[0;31m" fmt "\033[0m\n", ##__VA_ARGS__)
diff --git a/src/packet/test/gtest_packet_frag.cpp b/src/packet/test/gtest_packet_frag.cpp
index 8c3c7b1..222925b 100644
--- a/src/packet/test/gtest_packet_frag.cpp
+++ b/src/packet/test/gtest_packet_frag.cpp
@@ -1,7 +1,6 @@
 #include <gtest/gtest.h>
 
 #include "packet_private.h"
-#include "packet_utils.h"
 #include "packet_parser.h"
 
 /******************************************************************************
diff --git a/src/packet/test/gtest_packet_parser.cpp b/src/packet/test/gtest_packet_parser.cpp
index 80dd270..2bd3bb2 100644
--- a/src/packet/test/gtest_packet_parser.cpp
+++ b/src/packet/test/gtest_packet_parser.cpp
@@ -4,7 +4,6 @@
 #include "tuple.h"
 #include "packet_private.h"
 #include "packet_parser.h"
-#include "packet_utils.h"
 #include "packet_layer.h"
 #include "packet_dump.h"
 
diff --git a/src/packet_io/dumpfile_io.cpp b/src/packet_io/dumpfile_io.cpp
index 8189000..36d8925 100644
--- a/src/packet_io/dumpfile_io.cpp
+++ b/src/packet_io/dumpfile_io.cpp
@@ -15,7 +15,6 @@
 #include "dumpfile_io.h"
 #include "packet_private.h"
 #include "packet_ldbc.h"
-#include "packet_utils.h"
 #include "packet_parser.h"
 #include "packet_dump.h"
 #include "lock_free_queue.h"
diff --git a/src/packet_io/marsio_io.cpp b/src/packet_io/marsio_io.cpp
index 43a4284..9d21f5a 100644
--- a/src/packet_io/marsio_io.cpp
+++ b/src/packet_io/marsio_io.cpp
@@ -8,7 +8,6 @@
 #include "marsio.h"
 #include "marsio_io.h"
 #include "packet_private.h"
-#include "packet_utils.h"
 #include "packet_parser.h"
 
 #define PACKET_IO_LOG_ERROR(format, ...) LOG_ERROR("marsio", format, ##__VA_ARGS__)
diff --git a/src/plugin/plugin_manager.cpp b/src/plugin/plugin_manager.cpp
index 85728b0..c1dd859 100644
--- a/src/plugin/plugin_manager.cpp
+++ b/src/plugin/plugin_manager.cpp
@@ -7,7 +7,7 @@
 #include "stellar/stellar_core.h"
 #include "session/session_utils.h"
 #include "tuple/tuple.h"
-#include "packet/packet_utils.h"
+#include "packet/packet_private.h"
 
 UT_icd plugin_specs_icd = {sizeof(struct plugin_specific), NULL, NULL, NULL};
 
diff --git a/src/session/session_manager.cpp b/src/session/session_manager.cpp
index 70c9202..e56d113 100644
--- a/src/session/session_manager.cpp
+++ b/src/session/session_manager.cpp
@@ -6,7 +6,6 @@
 #include "utils.h"
 #include "packet_helper.h"
 #include "packet_layer.h"
-#include "packet_utils.h"
 #include "packet_filter.h"
 #include "snowflake.h"
 #include "session_def.h"
diff --git a/src/stellar/stellar_core.cpp b/src/stellar/stellar_core.cpp
index d1d5d9a..99c2c54 100644
--- a/src/stellar/stellar_core.cpp
+++ b/src/stellar/stellar_core.cpp
@@ -13,7 +13,6 @@
 #include "utils.h"
 #include "packet_io.h"
 #include "packet_private.h"
-#include "packet_utils.h"
 #include "session_utils.h"
 #include "snowflake.h"
 #include "stellar_stat.h"
diff --git a/test/packet_tool/packet_tool.cpp b/test/packet_tool/packet_tool.cpp
index 420cd45..c6b5982 100644
--- a/test/packet_tool/packet_tool.cpp
+++ b/test/packet_tool/packet_tool.cpp
@@ -6,7 +6,6 @@
 #include "packet_layer.h"
 #include "packet_parser.h"
 #include "packet_dump.h"
-#include "packet_utils.h"
 
 #define MAX_BUFF_SIZE 2048
 #define PRINT_GREEN(fmt, ...) printf("\033[0;32m" fmt "\033[0m\n", ##__VA_ARGS__)