diff --git a/include/CMakeLists.txt b/include/CMakeLists.txt
index ac87277..91b7269 100644
--- a/include/CMakeLists.txt
+++ b/include/CMakeLists.txt
@@ -1,5 +1,4 @@
 install(FILES stellar/utils.h DESTINATION include/stellar/ COMPONENT LIBRARIES)
-install(FILES stellar/tuple.h DESTINATION include/stellar/ COMPONENT LIBRARIES)
 install(FILES stellar/packet.h DESTINATION include/stellar/ COMPONENT LIBRARIES)
 install(FILES stellar/session.h DESTINATION include/stellar/ COMPONENT LIBRARIES)
 install(FILES stellar/stellar.h DESTINATION include/stellar/ COMPONENT LIBRARIES)
diff --git a/include/stellar/packet.h b/include/stellar/packet.h
index b867b6f..02060d0 100644
--- a/include/stellar/packet.h
+++ b/include/stellar/packet.h
@@ -6,7 +6,13 @@ extern "C"
 {
 #endif
 
-#include "stellar/tuple.h"
+#include <string.h>
+#include <arpa/inet.h>
+#define __FAVOR_BSD 1
+#include <netinet/tcp.h>
+#include <netinet/udp.h>
+#include <netinet/ip.h>
+#include <netinet/ip6.h>
 
 enum layer_type
 {
@@ -59,28 +65,6 @@ struct packet_layer
     uint16_t pld_len;    // payload length
 };
 
-// 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);
-
-const struct packet_layer *packet_get_innermost_layer(const struct packet *pkt, enum layer_type type);
-const struct packet_layer *packet_get_outermost_layer(const struct packet *pkt, enum layer_type type);
-
-/******************************************************************************
- * Utils
- ******************************************************************************/
-
 #define MAX_SID_NUM 8
 struct sid_list
 {
@@ -117,29 +101,6 @@ void packet_set_action(struct packet *pkt, enum packet_action action);
 enum packet_action packet_get_action(const struct packet *pkt);
 
 /*
- ******************************************************************************
- * Example: getting the innermost TCP layer
- ******************************************************************************
- *
- *    |<--------------------------- pkt->data_len -------------------------->|
- *    +----------+------+-----+-------+------+---------------+---------------+
- *    | Ethernet | IPv4 | UDP | GTP-U | IPv4 | TCP           | Payload       |
- *    +----------+------+-----+-------+------+---------------+---------------+
- *    ^                                      ^               ^
- *    |                                      |               |
- *    |<------------ hdr_offset ------------>|<-- hdr_len -->|<-- pld_len -->|
- *    |                                      |               |
- *    |                                      |               +-- pld_ptr
- *    |                                      +-- hdr_ptr
- *    +-- data_ptr
- *
- *    const struct packet_layer *tcp_layer = packet_get_innermost_layer(pkt, LAYER_TYPE_TCP);
- *    const struct tcphdr *hdr = (const struct tcphdr *)tcp_layer->hdr_ptr;
- *    uint16_t src_port = ntohs(hdr->th_sport);
- *    uint16_t dst_port = ntohs(hdr->th_dport);
- *    uint32_t seq = ntohl(hdr->th_seq);
- *    uint32_t ack = ntohl(hdr->th_ack);
- *
  ******************************************************************************
  * Example: foreach layer in packet
  ******************************************************************************
@@ -160,6 +121,168 @@ enum packet_action packet_get_action(const struct packet *pkt);
  *    }
  */
 
+struct address
+{
+    uint8_t family; // AF_INET or AF_INET6
+    union
+    {
+        struct in_addr v4;  /* network order */
+        struct in6_addr v6; /* network order */
+    } data;
+};
+
+static inline int packet_get_addr(const struct packet *pkt, struct address *src_addr, struct address *dst_addr)
+{
+    const struct ip *ip4_hdr = NULL;
+    const struct ip6_hdr *ip6_hdr = NULL;
+    const struct packet_layer *layer = NULL;
+    int8_t num = packet_get_layers_number(pkt);
+    for (int8_t i = num - 1; i >= 0; i--)
+    {
+        layer = packet_get_layer(pkt, i);
+        if (layer->type & LAYER_TYPE_IPV4)
+        {
+            ip4_hdr = (const struct ip *)layer->hdr_ptr;
+            if (src_addr != NULL)
+            {
+                src_addr->family = AF_INET;
+                src_addr->data.v4.s_addr = ip4_hdr->ip_src.s_addr;
+            }
+            if (dst_addr != NULL)
+            {
+                dst_addr->family = AF_INET;
+                dst_addr->data.v4.s_addr = ip4_hdr->ip_dst.s_addr;
+            }
+            return 0;
+        }
+        if (layer->type & LAYER_TYPE_IPV6)
+        {
+            ip6_hdr = (const struct ip6_hdr *)layer->hdr_ptr;
+            if (src_addr != NULL)
+            {
+                src_addr->family = AF_INET6;
+                src_addr->data.v6 = ip6_hdr->ip6_src;
+            }
+            if (dst_addr != NULL)
+            {
+                dst_addr->family = AF_INET6;
+                dst_addr->data.v6 = ip6_hdr->ip6_dst;
+            }
+            return 0;
+        }
+    }
+
+    return -1;
+}
+
+static inline int packet_get_port(const struct packet *pkt, uint16_t *src_port, uint16_t *dst_port)
+{
+    const struct tcphdr *tcp_hdr = NULL;
+    const struct udphdr *udp_hdr = NULL;
+    const struct packet_layer *layer = NULL;
+    int8_t num = packet_get_layers_number(pkt);
+    for (int8_t i = num - 1; i >= 0; i--)
+    {
+        layer = packet_get_layer(pkt, i);
+        if (layer->type & LAYER_TYPE_TCP)
+        {
+            tcp_hdr = (const struct tcphdr *)layer->hdr_ptr;
+            src_port != NULL ? *src_port = tcp_hdr->th_sport : 0;
+            dst_port != NULL ? *dst_port = tcp_hdr->th_dport : 0;
+            return 0;
+        }
+        if (layer->type & LAYER_TYPE_UDP)
+        {
+            udp_hdr = (const struct udphdr *)layer->hdr_ptr;
+            src_port != NULL ? *src_port = udp_hdr->uh_sport : 0;
+            dst_port != NULL ? *dst_port = udp_hdr->uh_dport : 0;
+            return 0;
+        }
+    }
+
+    return -1;
+}
+
+static inline int packet_get_ip_hdr(const struct packet *pkt, struct ip *hdr)
+{
+    const struct packet_layer *layer = NULL;
+    int8_t num = packet_get_layers_number(pkt);
+    for (int8_t i = num - 1; i >= 0; i--)
+    {
+        layer = packet_get_layer(pkt, i);
+        if (layer->type & LAYER_TYPE_IPV4)
+        {
+            if (hdr != NULL)
+            {
+                memcpy(hdr, layer->hdr_ptr, sizeof(struct ip));
+            }
+            return 0;
+        }
+    }
+
+    return -1;
+}
+
+static inline int packet_get_ip6_hdr(const struct packet *pkt, struct ip6_hdr *hdr)
+{
+    const struct packet_layer *layer = NULL;
+    int8_t num = packet_get_layers_number(pkt);
+    for (int8_t i = num - 1; i >= 0; i--)
+    {
+        layer = packet_get_layer(pkt, i);
+        if (layer->type & LAYER_TYPE_IPV6)
+        {
+            if (hdr != NULL)
+            {
+                memcpy(hdr, layer->hdr_ptr, sizeof(struct ip6_hdr));
+            }
+            return 0;
+        }
+    }
+
+    return -1;
+}
+
+static inline int packet_get_tcp_hdr(const struct packet *pkt, struct tcphdr *hdr)
+{
+    const struct packet_layer *layer = NULL;
+    int8_t num = packet_get_layers_number(pkt);
+    for (int8_t i = num - 1; i >= 0; i--)
+    {
+        layer = packet_get_layer(pkt, i);
+        if (layer->type & LAYER_TYPE_TCP)
+        {
+            if (hdr != NULL)
+            {
+                memcpy(hdr, layer->hdr_ptr, sizeof(struct tcphdr));
+            }
+            return 0;
+        }
+    }
+
+    return -1;
+}
+
+static inline int packet_get_udp_hdr(const struct packet *pkt, struct udphdr *hdr)
+{
+    const struct packet_layer *layer = NULL;
+    int8_t num = packet_get_layers_number(pkt);
+    for (int8_t i = num - 1; i >= 0; i--)
+    {
+        layer = packet_get_layer(pkt, i);
+        if (layer->type & LAYER_TYPE_UDP)
+        {
+            if (hdr != NULL)
+            {
+                memcpy(hdr, layer->hdr_ptr, sizeof(struct udphdr));
+            }
+            return 0;
+        }
+    }
+
+    return -1;
+}
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/stellar/session.h b/include/stellar/session.h
index 182677a..959ab50 100644
--- a/include/stellar/session.h
+++ b/include/stellar/session.h
@@ -139,10 +139,6 @@ enum closing_reason session_get_closing_reason(const struct session *sess);
 enum session_direction session_get_direction(const struct session *sess);
 enum flow_direction session_get_current_flow_direction(const struct session *sess);
 const struct packet *session_get_first_packet(const struct session *sess, enum flow_direction dir);
-
-const struct tuple6 *session_get_tuple6(const struct session *sess);
-enum flow_direction session_get_tuple6_direction(const struct session *sess);
-
 uint64_t session_get_id(const struct session *sess);
 uint64_t session_get_timestamp(const struct session *sess, enum session_timestamp type);
 uint64_t session_get_stat(const struct session *sess, enum flow_direction dir, enum session_stat stat);
diff --git a/src/evicted_session_filter/evicted_session_filter.h b/src/evicted_session_filter/evicted_session_filter.h
index 9c9ce38..262b77d 100644
--- a/src/evicted_session_filter/evicted_session_filter.h
+++ b/src/evicted_session_filter/evicted_session_filter.h
@@ -7,7 +7,7 @@ extern "C"
 #endif
 
 #include "log.h"
-#include "stellar/tuple.h"
+#include "tuple.h"
 
 #define EVICTED_SESSION_FILTER_LOG_ERROR(format, ...) LOG_ERROR("evicted session filter", format, ##__VA_ARGS__)
 
diff --git a/src/packet/packet_priv.h b/src/packet/packet_priv.h
index a40b049..46ac181 100644
--- a/src/packet/packet_priv.h
+++ b/src/packet/packet_priv.h
@@ -10,7 +10,7 @@ extern "C"
 #include <stdio.h>
 
 #include "log.h"
-#include "stellar/tuple.h"
+#include "tuple.h"
 #include "stellar/packet.h"
 
 #define PACKET_MAX_LAYERS 32
@@ -60,6 +60,24 @@ void packet_print_str(const struct packet *pkt);
 // direction 0: I2E
 uint64_t packet_get_hash(const struct packet *pkt, enum ldbc_method method, int direction);
 
+// 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);
+
+const struct packet_layer *packet_get_innermost_layer(const struct packet *pkt, enum layer_type type);
+const struct packet_layer *packet_get_outermost_layer(const struct packet *pkt, enum layer_type type);
+
 /******************************************************************************
  * Utils
  ******************************************************************************/
diff --git a/src/session/session_priv.h b/src/session/session_priv.h
index d2f1092..75b593d 100644
--- a/src/session/session_priv.h
+++ b/src/session/session_priv.h
@@ -10,7 +10,7 @@ extern "C"
 #include "packet_priv.h"
 #include "timeout.h"
 #include "uthash.h"
-#include "stellar/tuple.h"
+#include "tuple.h"
 #include "stellar/session.h"
 #include "tcp_reassembly.h"
 #include "session_manager.h"
@@ -84,7 +84,10 @@ void session_init(struct session *sess);
 void session_set_id(struct session *sess, uint64_t id);
 
 void session_set_tuple(struct session *sess, const struct tuple6 *key);
+const struct tuple6 *session_get_tuple6(const struct session *sess);
+
 void session_set_tuple_direction(struct session *sess, enum flow_direction dir);
+enum flow_direction session_get_tuple6_direction(const struct session *sess);
 
 void session_set_direction(struct session *sess, enum session_direction dir);
 void session_set_current_flow_direction(struct session *sess, enum flow_direction dir);
diff --git a/src/stellar/version.map b/src/stellar/version.map
index 275d5bd..f30c404 100644
--- a/src/stellar/version.map
+++ b/src/stellar/version.map
@@ -1,13 +1,5 @@
 LIBSTELLAR_DEVEL {
 global:
-	packet_get_innermost_tuple2;
-	packet_get_outermost_tuple2;
-	packet_get_innermost_tuple4;
-	packet_get_outermost_tuple4;
-	packet_get_innermost_tuple6;
-	packet_get_outermost_tuple6;
-	packet_get_innermost_layer;
-	packet_get_outermost_layer;
 	packet_get_direction;
 	packet_get_session_id;
 	packet_prepend_sid_list;
@@ -19,6 +11,12 @@ global:
 	packet_get_payload_len;
 	packet_set_action;
 	packet_get_action;
+	packet_get_addr;
+	packet_get_port;
+	packet_get_ip_hdr;
+	packet_get_ip6_hdr;
+	packet_get_tcp_hdr;
+	packet_get_udp_hdr;
 
 	session_exdata_free;
 	stellar_session_exdata_new_index;
@@ -44,8 +42,6 @@ global:
 	session_get_direction;
 	session_get_current_flow_direction;
 	session_get_first_packet;
-	session_get_tuple6;
-	session_get_tuple6_direction;
 	session_get_id;
 	session_get_timestamp;
 	session_get_stat;
@@ -64,22 +60,5 @@ global:
 	stellar_inject_ctrl_msg;
 	stellar_main;
 
-	tuple2_hash;
-	tuple4_hash;
-	tuple5_hash;
-	tuple6_hash;
-	tuple2_cmp;
-	tuple4_cmp;
-	tuple5_cmp;
-	tuple6_cmp;
-	tuple2_reverse;
-	tuple4_reverse;
-	tuple5_reverse;
-	tuple6_reverse;
-	tuple2_to_str;
-	tuple4_to_str;
-	tuple5_to_str;
-	tuple6_to_str;
-
 local: *;
 };
diff --git a/src/tuple/test/gtest_tuple.cpp b/src/tuple/test/gtest_tuple.cpp
index f1772e5..a5d141f 100644
--- a/src/tuple/test/gtest_tuple.cpp
+++ b/src/tuple/test/gtest_tuple.cpp
@@ -1,6 +1,6 @@
 #include <gtest/gtest.h>
 
-#include "stellar/tuple.h"
+#include "tuple.h"
 
 TEST(TUPLE, TUPLE2)
 {
diff --git a/src/tuple/tuple.cpp b/src/tuple/tuple.cpp
index 9c5bccf..63e2d7b 100644
--- a/src/tuple/tuple.cpp
+++ b/src/tuple/tuple.cpp
@@ -1,7 +1,7 @@
 #include <string.h>
 #include <stdio.h>
 
-#include "stellar/tuple.h"
+#include "tuple.h"
 #include "crc32_hash.h"
 
 uint32_t tuple2_hash(const struct tuple2 *tuple)
diff --git a/include/stellar/tuple.h b/src/tuple/tuple.h
similarity index 98%
rename from include/stellar/tuple.h
rename to src/tuple/tuple.h
index 8c9b2ff..15bae48 100644
--- a/include/stellar/tuple.h
+++ b/src/tuple/tuple.h
@@ -1,5 +1,5 @@
-#ifndef _TUPLE_PUB_H
-#define _TUPLE_PUB_H
+#ifndef _TUPLE_H
+#define _TUPLE_H
 
 #ifdef __cplusplus
 extern "C"
diff --git a/test/packet_inject/packet_inject_main.cpp b/test/packet_inject/packet_inject_main.cpp
index e4a3872..0a4a521 100644
--- a/test/packet_inject/packet_inject_main.cpp
+++ b/test/packet_inject/packet_inject_main.cpp
@@ -58,21 +58,21 @@ static int parse_cmd(int argc, char **argv)
 
     if (host)
     {
-        if (inet_pton(AF_INET, host, &rule.v4) != 1)
+        if (inet_pton(AF_INET, host, &rule.addr.data.v4) != 1)
         {
-            if (inet_pton(AF_INET6, host, &rule.v6) != 1)
+            if (inet_pton(AF_INET6, host, &rule.addr.data.v6) != 1)
             {
                 printf("unable to convert host %s to IPv4 / IPv6\n", host);
                 return -1;
             }
             else
             {
-                rule.ip_type = 6;
+                rule.addr.family = AF_INET6;
             }
         }
         else
         {
-            rule.ip_type = 4;
+            rule.addr.family = AF_INET;
         }
     }
 
diff --git a/test/packet_inject/packet_inject_main.h b/test/packet_inject/packet_inject_main.h
index a11cdb0..edf64fd 100644
--- a/test/packet_inject/packet_inject_main.h
+++ b/test/packet_inject/packet_inject_main.h
@@ -7,6 +7,7 @@ extern "C"
 #endif
 
 #include <arpa/inet.h>
+#include "stellar/packet.h"
 
 #define AFTER_RECV_C2S_N_PACKET 1
 #define AFTER_RECV_S2C_N_PACKET 2
@@ -23,10 +24,8 @@ enum packet_inject_type
 
 struct packet_inject_rule
 {
-    int ip_type;
-    struct in_addr v4;  /* network order */
-    struct in6_addr v6; /* network order */
-    int port;           /* network order */
+    struct address addr; /* network order */
+    uint16_t port;       /* network order */
 
     enum packet_inject_type inject_type;
 
diff --git a/test/packet_inject/packet_inject_plugin.cpp b/test/packet_inject/packet_inject_plugin.cpp
index 1c2917b..c9b84b3 100644
--- a/test/packet_inject/packet_inject_plugin.cpp
+++ b/test/packet_inject/packet_inject_plugin.cpp
@@ -2,7 +2,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "stellar/tuple.h"
+#include "stellar/packet.h"
 #include "stellar/session_mq.h"
 #include "packet_inject_main.h"
 
@@ -36,22 +36,29 @@ static void on_sess_msg(struct session *sess, int topic_id, const void *msg, voi
            session_get_stat(sess, FLOW_DIRECTION_C2S, STAT_RAW_PACKETS_RECEIVED),
            session_get_stat(sess, FLOW_DIRECTION_S2C, STAT_RAW_PACKETS_RECEIVED));
 
+    struct packet *pkt = (struct packet *)msg;
     char buffer[1024] = {0};
-    // struct packet *pkt = (struct packet *)msg;
-    const struct tuple6 *tuple = session_get_tuple6(sess);
-    if (rule.ip_type == 4 &&
-        memcmp(&tuple->src_addr.v4, &rule.v4, sizeof(struct in_addr)) &&
-        memcmp(&tuple->dst_addr.v4, &rule.v4, sizeof(struct in_addr)))
+    uint16_t src_port = 0;
+    uint16_t dst_port = 0;
+    struct address src_addr = {0};
+    struct address dst_addr = {0};
+
+    packet_get_addr(pkt, &src_addr, &dst_addr);
+    packet_get_port(pkt, &src_port, &dst_port);
+
+    if (rule.addr.family == AF_INET &&
+        memcmp(&src_addr.data.v4, &rule.addr.data.v4, sizeof(struct in_addr)) &&
+        memcmp(&dst_addr.data.v4, &rule.addr.data.v4, sizeof(struct in_addr)))
     {
         return;
     }
-    if (rule.ip_type == 6 &&
-        memcmp(&tuple->src_addr.v6, &rule.v6, sizeof(struct in6_addr)) &&
-        memcmp(&tuple->dst_addr.v6, &rule.v6, sizeof(struct in6_addr)))
+    if (rule.addr.family == AF_INET6 &&
+        memcmp(&src_addr.data.v6, &rule.addr.data.v6, sizeof(struct in6_addr)) &&
+        memcmp(&dst_addr.data.v6, &rule.addr.data.v6, sizeof(struct in6_addr)))
     {
         return;
     }
-    if (rule.port != 0 && tuple->src_port != rule.port && tuple->dst_port != rule.port)
+    if (rule.port != 0 && src_port != rule.port && dst_port != rule.port)
     {
         return;
     }