diff --git a/src/evicted_session_filter/CMakeLists.txt b/src/evicted_session_filter/CMakeLists.txt
deleted file mode 100644
index 97d8223..0000000
--- a/src/evicted_session_filter/CMakeLists.txt
+++ /dev/null
@@ -1,5 +0,0 @@
-add_library(evicted_session_filter evicted_session_filter.cpp)
-target_include_directories(evicted_session_filter PUBLIC ${CMAKE_CURRENT_LIST_DIR})
-target_link_libraries(evicted_session_filter packet dablooms)
-
-add_subdirectory(test)
\ No newline at end of file
diff --git a/src/evicted_session_filter/evicted_session_filter.h b/src/evicted_session_filter/evicted_session_filter.h
deleted file mode 100644
index 65864f0..0000000
--- a/src/evicted_session_filter/evicted_session_filter.h
+++ /dev/null
@@ -1,18 +0,0 @@
-#pragma once
-
-#ifdef __cplusplus
-extern "C"
-{
-#endif
-
-struct evicted_session_filter *evicted_session_filter_new(uint32_t capacity, uint32_t timeout, double error_rate, uint64_t now);
-void evicted_session_filter_free(struct evicted_session_filter *filter);
-
-// return 1: found
-// reutrn 0: no found
-int evicted_session_filter_lookup(struct evicted_session_filter *filter, const struct tuple6 *key, uint64_t now);
-void evicted_session_filter_add(struct evicted_session_filter *filter, const struct tuple6 *key, uint64_t now);
-
-#ifdef __cplusplus
-}
-#endif
diff --git a/src/evicted_session_filter/test/CMakeLists.txt b/src/evicted_session_filter/test/CMakeLists.txt
deleted file mode 100644
index 51dcfff..0000000
--- a/src/evicted_session_filter/test/CMakeLists.txt
+++ /dev/null
@@ -1,5 +0,0 @@
-add_executable(gtest_evicted_session_filter gtest_evicted_session_filter.cpp)
-target_link_libraries(gtest_evicted_session_filter evicted_session_filter gtest)
-
-include(GoogleTest)
-gtest_discover_tests(gtest_evicted_session_filter)
\ No newline at end of file
diff --git a/src/session/CMakeLists.txt b/src/session/CMakeLists.txt
index 397b71e..d9dcc18 100644
--- a/src/session/CMakeLists.txt
+++ b/src/session/CMakeLists.txt
@@ -3,6 +3,7 @@ add_library(session_manager
     session_pool.cpp
     session_table.cpp
     session_timer.cpp
+    session_filter.cpp
     session_manager.cpp
     session_transition.cpp
 )
@@ -10,6 +11,6 @@ target_include_directories(session_manager PUBLIC ${CMAKE_CURRENT_LIST_DIR})
 target_include_directories(session_manager PUBLIC ${CMAKE_SOURCE_DIR}/src/stellar)
 target_include_directories(session_manager PUBLIC ${CMAKE_SOURCE_DIR}/include)
 target_include_directories(session_manager PUBLIC ${CMAKE_SOURCE_DIR}/src/utils)
-target_link_libraries(session_manager timeout snowflake duplicated_packet_filter evicted_session_filter log tcp_reassembly)
+target_link_libraries(session_manager timeout snowflake duplicated_packet_filter dablooms log tcp_reassembly)
 
 add_subdirectory(test)
\ No newline at end of file
diff --git a/src/evicted_session_filter/evicted_session_filter.cpp b/src/session/session_filter.cpp
similarity index 53%
rename from src/evicted_session_filter/evicted_session_filter.cpp
rename to src/session/session_filter.cpp
index ae782eb..6fe0ef1 100644
--- a/src/evicted_session_filter/evicted_session_filter.cpp
+++ b/src/session/session_filter.cpp
@@ -1,24 +1,15 @@
-#include <string.h>
-
 #include "tuple.h"
 #include "dablooms.h"
-#include "udp_utils.h"
-#include "ip4_utils.h"
-#include "ip6_utils.h"
-#include "evicted_session_filter.h"
+#include "session_filter.h"
 
-struct evicted_session_filter
+struct session_filter
 {
     struct expiry_dablooms_handle *dablooms;
 };
 
-/******************************************************************************
- * Public API
- ******************************************************************************/
-
-struct evicted_session_filter *evicted_session_filter_new(uint32_t capacity, uint32_t timeout, double error_rate, uint64_t now)
+struct session_filter *session_filter_new(uint32_t capacity, uint32_t timeout, double error_rate, uint64_t now)
 {
-    struct evicted_session_filter *filter = (struct evicted_session_filter *)calloc(1, sizeof(struct evicted_session_filter));
+    struct session_filter *filter = (struct session_filter *)calloc(1, sizeof(struct session_filter));
     if (filter == NULL)
     {
         return NULL;
@@ -34,7 +25,7 @@ struct evicted_session_filter *evicted_session_filter_new(uint32_t capacity, uin
     return filter;
 }
 
-void evicted_session_filter_free(struct evicted_session_filter *filter)
+void session_filter_free(struct session_filter *filter)
 {
     if (filter)
     {
@@ -50,7 +41,7 @@ void evicted_session_filter_free(struct evicted_session_filter *filter)
 
 // return 1: found
 // reutrn 0: no found
-int evicted_session_filter_lookup(struct evicted_session_filter *filter, const struct tuple6 *key, uint64_t now)
+int session_filter_lookup(struct session_filter *filter, const struct tuple6 *key, uint64_t now)
 {
     if (expiry_dablooms_search(filter->dablooms, (const char *)key, sizeof(struct tuple6), now) == 1)
     {
@@ -60,7 +51,7 @@ int evicted_session_filter_lookup(struct evicted_session_filter *filter, const s
     return 0;
 }
 
-void evicted_session_filter_add(struct evicted_session_filter *filter, const struct tuple6 *key, uint64_t now)
+void session_filter_add(struct session_filter *filter, const struct tuple6 *key, uint64_t now)
 {
     struct tuple6 reverse_key;
     tuple6_reverse(key, &reverse_key);
diff --git a/src/session/session_filter.h b/src/session/session_filter.h
new file mode 100644
index 0000000..13f5236
--- /dev/null
+++ b/src/session/session_filter.h
@@ -0,0 +1,18 @@
+#pragma once
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+struct session_filter *session_filter_new(uint32_t capacity, uint32_t timeout, double error_rate, uint64_t now);
+void session_filter_free(struct session_filter *filter);
+
+// return 1: found
+// reutrn 0: no found
+int session_filter_lookup(struct session_filter *filter, const struct tuple6 *key, uint64_t now);
+void session_filter_add(struct session_filter *filter, const struct tuple6 *key, uint64_t now);
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/src/session/session_manager.cpp b/src/session/session_manager.cpp
index bbbabb6..23fdfb8 100644
--- a/src/session/session_manager.cpp
+++ b/src/session/session_manager.cpp
@@ -14,9 +14,9 @@
 #include "session_pool.h"
 #include "session_table.h"
 #include "session_timer.h"
+#include "session_filter.h"
 #include "session_manager.h"
 #include "session_transition.h"
-#include "evicted_session_filter.h"
 #include "duplicated_packet_filter.h"
 
 #define SESSION_LOG_ERROR(format, ...) LOG_ERROR("session", format, ##__VA_ARGS__)
@@ -31,7 +31,7 @@ struct session_manager
      struct session_table *udp_sess_table;
 
      struct duplicated_packet_filter *dup_pkt_filter;
-     struct evicted_session_filter *evicte_sess_filter;
+     struct session_filter *evicte_sess_filter;
 
      struct session_manager_stat stat;
      struct session_manager_options opts;
@@ -479,7 +479,7 @@ static int udp_overload_bypass(struct session_manager *mgr, const struct tuple6
 
 static int evicted_session_bypass(struct session_manager *mgr, const struct tuple6 *key)
 {
-     if (mgr->opts.evicted_session_filter_enable && evicted_session_filter_lookup(mgr->evicte_sess_filter, key, mgr->now_ms))
+     if (mgr->opts.evicted_session_filter_enable && session_filter_lookup(mgr->evicte_sess_filter, key, mgr->now_ms))
      {
           mgr->stat.udp_pkts_evctd_bypass++;
           return 1;
@@ -639,7 +639,7 @@ static void session_manager_evicte_session(struct session_manager *mgr, struct s
           session_table_del(mgr->udp_sess_table, sess);
           if (mgr->opts.evicted_session_filter_enable)
           {
-               evicted_session_filter_add(mgr->evicte_sess_filter, session_get_tuple6(sess), mgr->now_ms);
+               session_filter_add(mgr->evicte_sess_filter, session_get_tuple6(sess), mgr->now_ms);
           }
           SESS_MGR_STAT_UPDATE(&mgr->stat, curr_state, next_state, udp);
           mgr->stat.udp_sess_evicted++;
@@ -908,9 +908,9 @@ struct session_manager *session_manager_new(struct session_manager_options *opts
      }
      if (mgr->opts.evicted_session_filter_enable)
      {
-          mgr->evicte_sess_filter = evicted_session_filter_new(mgr->opts.evicted_session_filter_capacity,
-                                                               mgr->opts.evicted_session_filter_timeout,
-                                                               mgr->opts.evicted_session_filter_error_rate, now_ms);
+          mgr->evicte_sess_filter = session_filter_new(mgr->opts.evicted_session_filter_capacity,
+                                                       mgr->opts.evicted_session_filter_timeout,
+                                                       mgr->opts.evicted_session_filter_error_rate, now_ms);
           if (mgr->evicte_sess_filter == NULL)
           {
                goto error;
@@ -962,7 +962,7 @@ void session_manager_free(struct session_manager *mgr)
           }
           if (mgr->opts.evicted_session_filter_enable)
           {
-               evicted_session_filter_free(mgr->evicte_sess_filter);
+               session_filter_free(mgr->evicte_sess_filter);
           }
           if (mgr->opts.duplicated_packet_filter_enable)
           {
diff --git a/src/session/test/CMakeLists.txt b/src/session/test/CMakeLists.txt
index 1a8afe7..76bfdeb 100644
--- a/src/session/test/CMakeLists.txt
+++ b/src/session/test/CMakeLists.txt
@@ -14,6 +14,9 @@ target_link_libraries(gtest_session_table session_manager gtest)
 add_executable(gtest_session_timer gtest_session_timer.cpp)
 target_link_libraries(gtest_session_timer session_manager gtest)
 
+add_executable(gtest_session_filter gtest_session_filter.cpp)
+target_link_libraries(gtest_session_filter session_manager gtest)
+
 ###############################################################################
 # gtest state machine (TCP)
 ###############################################################################
@@ -110,6 +113,7 @@ gtest_discover_tests(gtest_session)
 gtest_discover_tests(gtest_session_pool)
 gtest_discover_tests(gtest_session_table)
 gtest_discover_tests(gtest_session_timer)
+gtest_discover_tests(gtest_session_filter)
 
 gtest_discover_tests(gtest_state_tcp_init_to_opening)
 gtest_discover_tests(gtest_state_tcp_opening_to_active)
diff --git a/src/evicted_session_filter/test/gtest_evicted_session_filter.cpp b/src/session/test/gtest_session_filter.cpp
similarity index 50%
rename from src/evicted_session_filter/test/gtest_evicted_session_filter.cpp
rename to src/session/test/gtest_session_filter.cpp
index a75ddcd..c3a0911 100644
--- a/src/evicted_session_filter/test/gtest_evicted_session_filter.cpp
+++ b/src/session/test/gtest_session_filter.cpp
@@ -1,9 +1,9 @@
 #include <gtest/gtest.h>
 
 #include "tuple.h"
-#include "evicted_session_filter.h"
+#include "session_filter.h"
 
-TEST(EVICTED_SESSION_FILTER, TEST)
+TEST(SESSION_FILTER, TEST)
 {
     struct tuple6 c2s_key;
     struct tuple6 s2c_key;
@@ -30,20 +30,20 @@ TEST(EVICTED_SESSION_FILTER, TEST)
     s2c_key.ip_proto = 0x05;
     s2c_key.domain = 0x0606060606060606;
 
-    struct evicted_session_filter *filter = evicted_session_filter_new(capacity, timeout, error_rate, 1);
+    struct session_filter *filter = session_filter_new(capacity, timeout, error_rate, 1);
     EXPECT_TRUE(filter != nullptr);
 
-    EXPECT_TRUE(evicted_session_filter_lookup(filter, &c2s_key, 1) == 0); // no found
-    EXPECT_TRUE(evicted_session_filter_lookup(filter, &s2c_key, 1) == 0); // no found
-    evicted_session_filter_add(filter, &c2s_key, 1);                      // add
-    EXPECT_TRUE(evicted_session_filter_lookup(filter, &c2s_key, 1) == 1); // found
-    EXPECT_TRUE(evicted_session_filter_lookup(filter, &s2c_key, 1) == 1); // found
-    EXPECT_TRUE(evicted_session_filter_lookup(filter, &c2s_key, 2) == 1); // found
-    EXPECT_TRUE(evicted_session_filter_lookup(filter, &s2c_key, 2) == 1); // found
-    EXPECT_TRUE(evicted_session_filter_lookup(filter, &c2s_key, 3) == 0); // not found
-    EXPECT_TRUE(evicted_session_filter_lookup(filter, &s2c_key, 3) == 0); // not found
+    EXPECT_TRUE(session_filter_lookup(filter, &c2s_key, 1) == 0); // no found
+    EXPECT_TRUE(session_filter_lookup(filter, &s2c_key, 1) == 0); // no found
+    session_filter_add(filter, &c2s_key, 1);                      // add
+    EXPECT_TRUE(session_filter_lookup(filter, &c2s_key, 1) == 1); // found
+    EXPECT_TRUE(session_filter_lookup(filter, &s2c_key, 1) == 1); // found
+    EXPECT_TRUE(session_filter_lookup(filter, &c2s_key, 2) == 1); // found
+    EXPECT_TRUE(session_filter_lookup(filter, &s2c_key, 2) == 1); // found
+    EXPECT_TRUE(session_filter_lookup(filter, &c2s_key, 3) == 0); // not found
+    EXPECT_TRUE(session_filter_lookup(filter, &s2c_key, 3) == 0); // not found
 
-    evicted_session_filter_free(filter);
+    session_filter_free(filter);
 }
 
 int main(int argc, char **argv)