diff --git a/src/dupkt_filter/dupkt_filter.cpp b/src/dupkt_filter/dupkt_filter.cpp
index f016339..ec34405 100644
--- a/src/dupkt_filter/dupkt_filter.cpp
+++ b/src/dupkt_filter/dupkt_filter.cpp
@@ -2,7 +2,7 @@
 
 #include "timestamp.h"
 #include "dablooms.h"
-#include "tcp_helpers.h"
+#include "tcp_utils.h"
 #include "ipv4_helpers.h"
 #include "dupkt_filter.h"
 
@@ -11,8 +11,8 @@ struct dupkt_filter_key
     // TCP
     uint32_t seq;
     uint32_t ack;
-    uint16_t src_port; /* network order */
-    uint16_t dst_port; /* network order */
+    uint16_t src_port; /* host order */
+    uint16_t dst_port; /* host order */
     uint16_t l4_checksum;
 
     // IPv4
@@ -53,15 +53,15 @@ static inline int packet_get_dupkt_filter_key(const struct packet *packet, struc
     memset(key, 0, sizeof(struct dupkt_filter_key));
 
     const struct ip *iphdr = (const struct ip *)ipv4_layer->hdr_ptr;
-    key->ip_id = ipv4_hdr_get_ipid(iphdr);
+    key->ip_id = ipv4_hdr_get_id(iphdr);
     key->src_addr = ipv4_hdr_get_net_order_saddr(iphdr);
     key->dst_addr = ipv4_hdr_get_net_order_daddr(iphdr);
 
     const struct tcphdr *tcphdr = (const struct tcphdr *)tcp_layer->hdr_ptr;
     key->seq = tcp_hdr_get_seq(tcphdr);
     key->ack = tcp_hdr_get_ack(tcphdr);
-    key->src_port = tcp_hdr_get_net_order_sport(tcphdr);
-    key->dst_port = tcp_hdr_get_net_order_dport(tcphdr);
+    key->src_port = tcp_hdr_get_src_port(tcphdr);
+    key->dst_port = tcp_hdr_get_dst_port(tcphdr);
     key->l4_checksum = tcp_hdr_get_checksum(tcphdr);
 
     return 0;
diff --git a/src/packet/packet.cpp b/src/packet/packet.cpp
index c640a60..756f321 100644
--- a/src/packet/packet.cpp
+++ b/src/packet/packet.cpp
@@ -11,6 +11,7 @@
 #include "uthash.h"
 #include "packet.h"
 #include "udp_utils.h"
+#include "tcp_utils.h"
 
 #define likely(expr) __builtin_expect((expr), 1)
 #define unlikely(expr) __builtin_expect((expr), 0)
@@ -977,7 +978,7 @@ static inline const char *parse_tcp(struct packet *handler, const char *data, ui
     {
         return data;
     }
-    uint16_t hdr_len = ((struct tcphdr *)data)->th_off << 2;
+    uint16_t hdr_len = tcp_hdr_get_hdr_len((struct tcphdr *)data);
     SET_LAYER(handler, layer, LAYER_TYPE_TCP, hdr_len, data, len);
 
     return layer->pld_ptr;
diff --git a/src/packet/tcp_helpers.h b/src/packet/tcp_helpers.h
deleted file mode 100644
index f8fa560..0000000
--- a/src/packet/tcp_helpers.h
+++ /dev/null
@@ -1,146 +0,0 @@
-#ifndef _TCP_HELPERS_H
-#define _TCP_HELPERS_H
-
-#ifdef __cpluscplus
-extern "C"
-{
-#endif
-
-#include <arpa/inet.h>
-#define __FAVOR_BSD 1
-#include <netinet/tcp.h>
-
-/*
- * TCP Header Format
- *
- *   0                   1                   2                   3
- *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
- *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- *  |          Source Port          |       Destination Port        |
- *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- *  |                        Sequence Number                        |
- *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- *  |                    Acknowledgment Number                      |
- *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- *  |  Data |           |U|A|P|R|S|F|                               |
- *  | Offset| Reserved  |R|C|S|S|Y|I|            Window             |
- *  |       |           |G|K|H|T|N|N|                               |
- *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- *  |           Checksum            |         Urgent Pointer        |
- *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- *  |                    Options                    |    Padding    |
- *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- *  |                             data                              |
- *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- */
-
-static inline uint16_t tcp_hdr_get_host_order_sport(const struct tcphdr *hdr)
-{
-    return ntohs(hdr->th_sport);
-}
-
-static inline uint16_t tcp_hdr_get_host_order_dport(const struct tcphdr *hdr)
-{
-    return ntohs(hdr->th_dport);
-}
-
-static inline uint16_t tcp_hdr_get_net_order_sport(const struct tcphdr *hdr)
-{
-    return hdr->th_sport;
-}
-
-static inline uint16_t tcp_hdr_get_net_order_dport(const struct tcphdr *hdr)
-{
-    return hdr->th_dport;
-}
-
-static inline uint32_t tcp_hdr_get_seq(const struct tcphdr *hdr)
-{
-    return ntohl(hdr->th_seq);
-}
-
-static inline uint32_t tcp_hdr_get_ack(const struct tcphdr *hdr)
-{
-    return ntohl(hdr->th_ack);
-}
-
-static inline uint8_t tcp_hdr_get_doff(const struct tcphdr *hdr)
-{
-    return hdr->th_off << 2;
-}
-
-static inline uint8_t tcp_hdr_get_flags(const struct tcphdr *hdr)
-{
-    return hdr->th_flags;
-}
-
-static inline bool tcp_hdr_has_flag_urg(const struct tcphdr *hdr)
-{
-    return hdr->th_flags & TH_URG;
-}
-
-static inline bool tcp_hdr_has_flag_ack(const struct tcphdr *hdr)
-{
-    return hdr->th_flags & TH_ACK;
-}
-
-static inline bool tcp_hdr_has_flag_psh(const struct tcphdr *hdr)
-{
-    return hdr->th_flags & TH_PUSH;
-}
-
-static inline bool tcp_hdr_has_flag_rst(const struct tcphdr *hdr)
-{
-    return hdr->th_flags & TH_RST;
-}
-
-static inline bool tcp_hdr_has_flag_syn(const struct tcphdr *hdr)
-{
-    return hdr->th_flags & TH_SYN;
-}
-
-static inline bool tcp_hdr_has_flag_fin(const struct tcphdr *hdr)
-{
-    return hdr->th_flags & TH_FIN;
-}
-
-static inline uint16_t tcp_hdr_get_window(const struct tcphdr *hdr)
-{
-    return ntohs(hdr->th_win);
-}
-
-static inline uint16_t tcp_hdr_get_checksum(const struct tcphdr *hdr)
-{
-    return ntohs(hdr->th_sum);
-}
-
-static inline uint16_t tcp_hdr_get_urg_ptr(const struct tcphdr *hdr)
-{
-    return ntohs(hdr->th_urp);
-}
-
-static inline uint16_t tcp_hdr_get_opt_len(const struct tcphdr *hdr)
-{
-    return tcp_hdr_get_doff(hdr) - sizeof(struct tcphdr);
-}
-
-static inline const uint8_t *tcp_hdr_get_opt_ptr(const struct tcphdr *hdr)
-{
-    return ((const uint8_t *)hdr) + sizeof(struct tcphdr);
-}
-
-static inline void tcp_hdr_set_flags(struct tcphdr *hdr, uint8_t flags)
-{
-    hdr->th_flags = flags;
-}
-
-static inline void tcp_hdr_set_flag_rst(struct tcphdr *hdr)
-{
-    hdr->th_flags |= TH_RST;
-}
-
-#ifdef __cpluscplus
-}
-#endif
-
-#endif
diff --git a/src/packet/tcp_utilis.h b/src/packet/tcp_utilis.h
new file mode 100644
index 0000000..26fdc53
--- /dev/null
+++ b/src/packet/tcp_utilis.h
@@ -0,0 +1,263 @@
+#ifndef _TCP_UTILS_H
+#define _TCP_UTILS_H
+
+#ifdef __cpluscplus
+extern "C"
+{
+#endif
+
+#include <string.h>
+#include <arpa/inet.h>
+#define __FAVOR_BSD 1
+#include <netinet/tcp.h>
+
+/*
+ * TCP Header Format
+ *
+ *   0                   1                   2                   3
+ *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |          Source Port          |       Destination Port        |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |                        Sequence Number                        |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |                    Acknowledgment Number                      |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |  Data |           |U|A|P|R|S|F|                               |
+ *  | Offset| Reserved  |R|C|S|S|Y|I|            Window             |
+ *  |       |           |G|K|H|T|N|N|                               |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |           Checksum            |         Urgent Pointer        |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |                    Options                    |    Padding    |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |                             data                              |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+/******************************************************************************
+ * get
+ ******************************************************************************/
+
+static inline uint16_t tcp_hdr_get_src_port(const struct tcphdr *hdr)
+{
+    return ntohs(hdr->th_sport);
+}
+
+static inline uint16_t tcp_hdr_get_dst_port(const struct tcphdr *hdr)
+{
+    return ntohs(hdr->th_dport);
+}
+
+static inline uint32_t tcp_hdr_get_seq(const struct tcphdr *hdr)
+{
+    return ntohl(hdr->th_seq);
+}
+
+static inline uint32_t tcp_hdr_get_ack(const struct tcphdr *hdr)
+{
+    return ntohl(hdr->th_ack);
+}
+
+static inline uint8_t tcp_hdr_get_hdr_len(const struct tcphdr *hdr)
+{
+    return hdr->th_off << 2;
+}
+
+static inline uint8_t tcp_hdr_get_flags(const struct tcphdr *hdr)
+{
+    return hdr->th_flags;
+}
+
+static inline bool tcp_hdr_get_urg_flag(const struct tcphdr *hdr)
+{
+    return hdr->th_flags & TH_URG;
+}
+
+static inline bool tcp_hdr_get_ack_flag(const struct tcphdr *hdr)
+{
+    return hdr->th_flags & TH_ACK;
+}
+
+static inline bool tcp_hdr_get_push_flag(const struct tcphdr *hdr)
+{
+    return hdr->th_flags & TH_PUSH;
+}
+
+static inline bool tcp_hdr_get_rst_flag(const struct tcphdr *hdr)
+{
+    return hdr->th_flags & TH_RST;
+}
+
+static inline bool tcp_hdr_get_syn_flag(const struct tcphdr *hdr)
+{
+    return hdr->th_flags & TH_SYN;
+}
+
+static inline bool tcp_hdr_get_fin_flag(const struct tcphdr *hdr)
+{
+    return hdr->th_flags & TH_FIN;
+}
+
+static inline uint16_t tcp_hdr_get_window(const struct tcphdr *hdr)
+{
+    return ntohs(hdr->th_win);
+}
+
+static inline uint16_t tcp_hdr_get_checksum(const struct tcphdr *hdr)
+{
+    return ntohs(hdr->th_sum);
+}
+
+static inline uint16_t tcp_hdr_get_urg_ptr(const struct tcphdr *hdr)
+{
+    return ntohs(hdr->th_urp);
+}
+
+static inline uint16_t tcp_hdr_get_opt_len(const struct tcphdr *hdr)
+{
+    return tcp_hdr_get_hdr_len(hdr) - sizeof(struct tcphdr);
+}
+
+static inline const char *tcp_hdr_get_opt_data(const struct tcphdr *hdr)
+{
+    return ((const char *)hdr) + sizeof(struct tcphdr);
+}
+
+/******************************************************************************
+ * set
+ ******************************************************************************/
+
+static inline void tcp_hdr_set_src_port(struct tcphdr *hdr, uint16_t port)
+{
+    hdr->th_sport = htons(port);
+}
+
+static inline void tcp_hdr_set_dst_port(struct tcphdr *hdr, uint16_t port)
+{
+    hdr->th_dport = htons(port);
+}
+
+static inline void tcp_hdr_set_seq(struct tcphdr *hdr, uint32_t seq)
+{
+    hdr->th_seq = htonl(seq);
+}
+
+static inline void tcp_hdr_set_ack(struct tcphdr *hdr, uint32_t ack)
+{
+    hdr->th_ack = htonl(ack);
+}
+
+static inline void tcp_hdr_set_hdr_len(struct tcphdr *hdr, uint8_t offset)
+{
+    hdr->th_off = offset >> 2;
+}
+
+static inline void tcp_hdr_set_flags(struct tcphdr *hdr, uint8_t flags)
+{
+    hdr->th_flags = flags;
+}
+
+static inline void tcp_hdr_set_urg_flag(struct tcphdr *hdr, bool flag)
+{
+    if (flag)
+    {
+        hdr->th_flags |= TH_URG;
+    }
+    else
+    {
+        hdr->th_flags &= ~TH_URG;
+    }
+}
+
+static inline void tcp_hdr_set_ack_flag(struct tcphdr *hdr, bool flag)
+{
+    if (flag)
+    {
+        hdr->th_flags |= TH_ACK;
+    }
+    else
+    {
+        hdr->th_flags &= ~TH_ACK;
+    }
+}
+
+static inline void tcp_hdr_set_push_flag(struct tcphdr *hdr, bool flag)
+{
+    if (flag)
+    {
+        hdr->th_flags |= TH_PUSH;
+    }
+    else
+    {
+        hdr->th_flags &= ~TH_PUSH;
+    }
+}
+
+static inline void tcp_hdr_set_rst_flag(struct tcphdr *hdr, bool flag)
+{
+    if (flag)
+    {
+        hdr->th_flags |= TH_RST;
+    }
+    else
+    {
+        hdr->th_flags &= ~TH_RST;
+    }
+}
+
+static inline void tcp_hdr_set_syn_flag(struct tcphdr *hdr, bool flag)
+{
+    if (flag)
+    {
+        hdr->th_flags |= TH_SYN;
+    }
+    else
+    {
+        hdr->th_flags &= ~TH_SYN;
+    }
+}
+
+static inline void tcp_hdr_set_fin_flag(struct tcphdr *hdr, bool flag)
+{
+    if (flag)
+    {
+        hdr->th_flags |= TH_FIN;
+    }
+    else
+    {
+        hdr->th_flags &= ~TH_FIN;
+    }
+}
+
+static inline void tcp_hdr_set_window(struct tcphdr *hdr, uint16_t window)
+{
+    hdr->th_win = htons(window);
+}
+
+static inline void tcp_hdr_set_checksum(struct tcphdr *hdr, uint16_t checksum)
+{
+    hdr->th_sum = htons(checksum);
+}
+
+static inline void tcp_hdr_set_urg_ptr(struct tcphdr *hdr, uint16_t ptr)
+{
+    hdr->th_urp = htons(ptr);
+}
+
+static inline void tcp_hdr_set_opt_len(struct tcphdr *hdr, uint16_t len)
+{
+    hdr->th_off = (sizeof(struct tcphdr) + len) >> 2;
+}
+
+// must be called after tcp_hdr_set_opt_len
+static inline void tcp_hdr_set_opt_data(struct tcphdr *hdr, const char *ptr)
+{
+    memcpy((char *)hdr + sizeof(struct tcphdr), ptr, tcp_hdr_get_opt_len(hdr));
+}
+
+#ifdef __cpluscplus
+}
+#endif
+
+#endif
diff --git a/src/packet/test/CMakeLists.txt b/src/packet/test/CMakeLists.txt
index 798f514..4bb05b6 100644
--- a/src/packet/test/CMakeLists.txt
+++ b/src/packet/test/CMakeLists.txt
@@ -8,8 +8,8 @@ target_link_libraries(gtest_packet packet gtest)
 add_executable(gtest_udp_utils gtest_udp_utils.cpp)
 target_link_libraries(gtest_udp_utils packet gtest)
 
-add_executable(gtest_tcp_helpers gtest_tcp_helpers.cpp)
-target_link_libraries(gtest_tcp_helpers packet gtest)
+add_executable(gtest_tcp_utils gtest_tcp_utils.cpp)
+target_link_libraries(gtest_tcp_utils packet gtest)
 
 add_executable(gtest_ipv4_helpers gtest_ipv4_helpers.cpp)
 target_link_libraries(gtest_ipv4_helpers packet gtest)
@@ -23,7 +23,7 @@ target_link_libraries(gtest_packet_helpers packet gtest)
 include(GoogleTest)
 gtest_discover_tests(gtest_packet)
 gtest_discover_tests(gtest_udp_utils)
-gtest_discover_tests(gtest_tcp_helpers)
+gtest_discover_tests(gtest_tcp_utils)
 gtest_discover_tests(gtest_ipv4_helpers)
 gtest_discover_tests(gtest_ipv6_helpers)
 gtest_discover_tests(gtest_packet_helpers)
\ No newline at end of file
diff --git a/src/packet/test/gtest_tcp_helpers.cpp b/src/packet/test/gtest_tcp_utils.cpp
similarity index 67%
rename from src/packet/test/gtest_tcp_helpers.cpp
rename to src/packet/test/gtest_tcp_utils.cpp
index 739edf7..d5ac03b 100644
--- a/src/packet/test/gtest_tcp_helpers.cpp
+++ b/src/packet/test/gtest_tcp_utils.cpp
@@ -1,6 +1,6 @@
 #include <gtest/gtest.h>
 
-#include "tcp_helpers.h"
+#include "tcp_utils.h"
 
 /*
  * Transmission Control Protocol, Src Port: 55555, Dst Port: 40856, Seq: 0, Ack: 1, Len: 0
@@ -74,26 +74,71 @@ unsigned char data[] = {
     0xd9, 0x03, 0x9f, 0x98, 0xec, 0x5f, 0xc6, 0x3c, 0x3b, 0x12, 0x47, 0x92, 0xa0, 0x12, 0xaa, 0xaa, 0xfe, 0x30, 0x00, 0x00, 0x02, 0x04, 0xff, 0xd7, 0x04, 0x02,
     0x08, 0x0a, 0xa4, 0xef, 0xa3, 0xcc, 0xa4, 0xef, 0xa3, 0xcc, 0x01, 0x03, 0x03, 0x07};
 
-TEST(TCP_HELPERS, TEST)
+TEST(TCP_UTILS, GET)
 {
     const struct tcphdr *hdr = (struct tcphdr *)data;
-    EXPECT_TRUE(tcp_hdr_get_host_order_sport(hdr) == 55555);
-    EXPECT_TRUE(tcp_hdr_get_host_order_dport(hdr) == 40856);
+    EXPECT_TRUE(tcp_hdr_get_src_port(hdr) == 55555);
+    EXPECT_TRUE(tcp_hdr_get_dst_port(hdr) == 40856);
     EXPECT_TRUE(tcp_hdr_get_seq(hdr) == 3965699644);
     EXPECT_TRUE(tcp_hdr_get_ack(hdr) == 991053714);
-    EXPECT_TRUE(tcp_hdr_get_doff(hdr) == 40);
+    EXPECT_TRUE(tcp_hdr_get_hdr_len(hdr) == 40);
     EXPECT_TRUE(tcp_hdr_get_flags(hdr) == 0x012);
-    EXPECT_TRUE(tcp_hdr_has_flag_urg(hdr) == false);
-    EXPECT_TRUE(tcp_hdr_has_flag_ack(hdr) == true);
-    EXPECT_TRUE(tcp_hdr_has_flag_psh(hdr) == false);
-    EXPECT_TRUE(tcp_hdr_has_flag_rst(hdr) == false);
-    EXPECT_TRUE(tcp_hdr_has_flag_syn(hdr) == true);
-    EXPECT_TRUE(tcp_hdr_has_flag_fin(hdr) == false);
+    EXPECT_TRUE(tcp_hdr_get_urg_flag(hdr) == false);
+    EXPECT_TRUE(tcp_hdr_get_ack_flag(hdr) == true);
+    EXPECT_TRUE(tcp_hdr_get_push_flag(hdr) == false);
+    EXPECT_TRUE(tcp_hdr_get_rst_flag(hdr) == false);
+    EXPECT_TRUE(tcp_hdr_get_syn_flag(hdr) == true);
+    EXPECT_TRUE(tcp_hdr_get_fin_flag(hdr) == false);
     EXPECT_TRUE(tcp_hdr_get_window(hdr) == 43690);
     EXPECT_TRUE(tcp_hdr_get_checksum(hdr) == 0xfe30);
     EXPECT_TRUE(tcp_hdr_get_urg_ptr(hdr) == 0);
     EXPECT_TRUE(tcp_hdr_get_opt_len(hdr) == 20);
-    EXPECT_TRUE(tcp_hdr_get_opt_ptr(hdr) == data + 20);
+    EXPECT_TRUE(tcp_hdr_get_opt_data(hdr) == data + 20);
+}
+
+TEST(TCP_UTILS, SET1)
+{
+    char buff[40];
+
+    struct tcphdr *hdr = (struct tcphdr *)buff;
+    tcp_hdr_set_src_port(hdr, 55555);
+    tcp_hdr_set_dst_port(hdr, 40856);
+    tcp_hdr_set_seq(hdr, 3965699644);
+    tcp_hdr_set_ack(hdr, 991053714);
+    tcp_hdr_set_hdr_len(hdr, 40);
+    tcp_hdr_set_flags(hdr, 0x012);
+    tcp_hdr_set_window(hdr, 43690);
+    tcp_hdr_set_checksum(hdr, 0xfe30);
+    tcp_hdr_set_urg_ptr(hdr, 0);
+    tcp_hdr_set_opt_len(hdr, 20);
+    tcp_hdr_set_opt_data(hdr, data + 20);
+
+    EXPECT_TRUE(memcmp(buff, data, 40) == 0);
+}
+
+TEST(TCP_UTILS, SET2)
+{
+    char buff[40] = {0};
+
+    struct tcphdr *hdr = (struct tcphdr *)buff;
+    tcp_hdr_set_src_port(hdr, 55555);
+    tcp_hdr_set_dst_port(hdr, 40856);
+    tcp_hdr_set_seq(hdr, 3965699644);
+    tcp_hdr_set_ack(hdr, 991053714);
+    tcp_hdr_set_hdr_len(hdr, 40);
+    tcp_hdr_set_urg_flag(hdr, false);
+    tcp_hdr_set_ack_flag(hdr, true);
+    tcp_hdr_set_push_flag(hdr, false);
+    tcp_hdr_set_rst_flag(hdr, false);
+    tcp_hdr_set_syn_flag(hdr, true);
+    tcp_hdr_set_fin_flag(hdr, false);
+    tcp_hdr_set_window(hdr, 43690);
+    tcp_hdr_set_checksum(hdr, 0xfe30);
+    tcp_hdr_set_urg_ptr(hdr, 0);
+    tcp_hdr_set_opt_len(hdr, 20);
+    tcp_hdr_set_opt_data(hdr, data + 20);
+
+    EXPECT_TRUE(memcmp(buff, data, 40) == 0);
 }
 
 int main(int argc, char **argv)
diff --git a/src/session/session_manager.cpp b/src/session/session_manager.cpp
index a4f80f8..f060a5e 100644
--- a/src/session/session_manager.cpp
+++ b/src/session/session_manager.cpp
@@ -8,8 +8,8 @@
 #include "session_timer.h"
 #include "session_queue.h"
 #include "session_manager.h"
-#include "tcp_helpers.h"
-#include "udp_helpers.h"
+#include "tcp_utils.h"
+#include "udp_utils.h"
 #include "packet_helpers.h"
 #include "dupkt_filter.h"
 #include "eviction_filter.h"
@@ -390,13 +390,13 @@ static inline void session_update_tcp_state(struct session *sess, const struct l
 {
      const struct tcphdr *hdr = (const struct tcphdr *)tcp_layer->hdr_ptr;
      uint64_t state = session_get_tcp_state(sess);
-     if (tcp_hdr_has_flag_syn(hdr))
+     if (tcp_hdr_get_syn_flag(hdr))
      {
-          state |= (tcp_hdr_has_flag_ack(hdr) ? TCP_SYNACK_RECVED : TCP_SYN_RECVED);
+          state |= (tcp_hdr_get_ack_flag(hdr) ? TCP_SYNACK_RECVED : TCP_SYN_RECVED);
      }
      else
      {
-          if (tcp_hdr_has_flag_ack(hdr))
+          if (tcp_hdr_get_ack_flag(hdr))
           {
                if (curr_dir == SESSION_DIR_C2S)
                {
@@ -408,7 +408,7 @@ static inline void session_update_tcp_state(struct session *sess, const struct l
                }
           }
      }
-     if (tcp_hdr_has_flag_fin(hdr))
+     if (tcp_hdr_get_fin_flag(hdr))
      {
           if (curr_dir == SESSION_DIR_C2S)
           {
@@ -419,7 +419,7 @@ static inline void session_update_tcp_state(struct session *sess, const struct l
                state |= TCP_S2C_FIN_RECVED;
           }
      }
-     if (tcp_hdr_has_flag_rst(hdr))
+     if (tcp_hdr_get_rst_flag(hdr))
      {
           if (curr_dir == SESSION_DIR_C2S)
           {
@@ -608,7 +608,7 @@ static inline void session_manager_update_session_base(struct session_manager *m
 
 static inline void session_manager_update_session_packet(struct session_manager *mgr, struct session *sess, const struct packet *pkt, enum session_dir curr_dir)
 {
-     uint64_t len = packet_get_raw_len(pkt);
+     uint64_t len = packet_get_len(pkt);
      if (curr_dir == SESSION_DIR_C2S)
      {
           session_inc_c2s_metrics(sess, 1, len);
@@ -809,7 +809,7 @@ static inline struct session *session_manager_new_tcp_session(struct session_man
      }
 
      const struct tcphdr *hdr = (const struct tcphdr *)tcp_layer->hdr_ptr;
-     if (!tcp_hdr_has_flag_syn(hdr))
+     if (!tcp_hdr_get_syn_flag(hdr))
      {
           mgr->npkts_hit_tcp_miss_sess++;
           return NULL;
@@ -841,7 +841,7 @@ static inline struct session *session_manager_new_tcp_session(struct session_man
      struct session *sess = session_pool_alloc(mgr->sess_pool);
      assert(sess);
 
-     enum session_dir curr_dir = tcp_hdr_has_flag_ack(hdr) ? SESSION_DIR_S2C : SESSION_DIR_C2S;
+     enum session_dir curr_dir = tcp_hdr_get_ack_flag(hdr) ? SESSION_DIR_S2C : SESSION_DIR_C2S;
      session_manager_update_session_base(mgr, sess, key, curr_dir);
      session_manager_update_session_packet(mgr, sess, pkt, curr_dir);
      session_update_tcp_state(sess, tcp_layer, curr_dir);