diff --git a/src/ip_fragment/ip_fragment.cpp b/src/ip_fragment/ip_fragment.cpp
new file mode 100644
index 0000000..8ee9c74
--- /dev/null
+++ b/src/ip_fragment/ip_fragment.cpp
@@ -0,0 +1,32 @@
+#include "ip_fragment.h"
+
+/*
+ * Return the number of fragmented packets, stored in the pkts_out array
+ * Packets in the pkts_out array should be freed by calling the packet_free() function
+ */
+
+uint16_t ipv4_fragment_packet(struct packet *pkt_in, struct packet **pkts_out, uint16_t nb_pkts_out, uint16_t mtu_size)
+{
+    if (pkt_in == NULL || pkts_out == NULL || nb_pkts_out == 0)
+    {
+        IP_FRAGMENT_LOG_ERROR("invalid input parameters");
+        return 0;
+    }
+
+    // TODO
+
+    return 0;
+}
+
+uint16_t ipv6_fragment_packet(struct packet *pkt_in, struct packet **pkts_out, uint16_t nb_pkts_out, uint16_t mtu_size)
+{
+    if (pkt_in == NULL || pkts_out == NULL || nb_pkts_out == 0)
+    {
+        IP_FRAGMENT_LOG_ERROR("invalid input parameters");
+        return 0;
+    }
+
+    // TODO
+
+    return 0;
+}
\ No newline at end of file
diff --git a/src/ip_fragment/ip_fragment.h b/src/ip_fragment/ip_fragment.h
new file mode 100644
index 0000000..227d750
--- /dev/null
+++ b/src/ip_fragment/ip_fragment.h
@@ -0,0 +1,26 @@
+#ifndef _IP_FRAGMENT_H
+#define _IP_FRAGMENT_H
+
+#ifdef __cpluscplus
+extern "C"
+{
+#endif
+
+#include "packet.h"
+#include "log.h"
+
+#define IP_FRAGMENT_LOG_DEBUG(format, ...) LOG_DEBUG("ip_fragment", format, ##__VA_ARGS__)
+#define IP_FRAGMENT_LOG_ERROR(format, ...) LOG_ERROR("ip_fragment", format, ##__VA_ARGS__)
+
+/*
+ * Return the number of fragmented packets, stored in the pkts_out array
+ * Packets in the pkts_out array should be freed by calling the packet_free() function
+ */
+uint16_t ipv4_fragment_packet(struct packet *pkt_in, struct packet **pkts_out, uint16_t nb_pkts_out, uint16_t mtu_size);
+uint16_t ipv6_fragment_packet(struct packet *pkt_in, struct packet **pkts_out, uint16_t nb_pkts_out, uint16_t mtu_size);
+
+#ifdef __cpluscplus
+}
+#endif
+
+#endif
diff --git a/src/ip_reassemble/ip_reassemble.cpp b/src/ip_reassemble/ip_reassemble.cpp
new file mode 100644
index 0000000..4479d7f
--- /dev/null
+++ b/src/ip_reassemble/ip_reassemble.cpp
@@ -0,0 +1,31 @@
+#include "ip_reassemble.h"
+
+struct ip_reassemble_manager *ip_reassemble_manager_create(const struct ip_reassemble_config *config)
+{
+    // TODO
+}
+
+void ip_reassemble_manager_destory(struct ip_reassemble_manager *mgr)
+{
+    // TODO
+}
+
+void ip_reassemble_manager_stat(struct ip_reassemble_manager *mgr)
+{
+    // TODO
+}
+
+/*
+ * Returns the reassembled packet, or NULL if the packet is not reassembled
+ * The returned packet should be freed by calling the packet_free() function
+ */
+
+struct packet *ipv4_reassemble_packet(struct ip_reassemble_manager *mgr, const struct packet *pkt)
+{
+    // TODO
+}
+
+struct packet *ipv6_reassemble_packet(struct ip_reassemble_manager *mgr, const struct packet *pkt)
+{
+    // TODO
+}
\ No newline at end of file
diff --git a/src/ip_reassemble/ip_reassemble.h b/src/ip_reassemble/ip_reassemble.h
new file mode 100644
index 0000000..911e8bc
--- /dev/null
+++ b/src/ip_reassemble/ip_reassemble.h
@@ -0,0 +1,40 @@
+#ifndef _IP_REASSEMBLE_H
+#define _IP_REASSEMBLE_H
+
+#ifdef __cpluscplus
+extern "C"
+{
+#endif
+
+#include "packet.h"
+#include "log.h"
+
+#define IP_REASSEMBLE_DEBUG(format, ...) LOG_DEBUG("ip_reassemble", format, ##__VA_ARGS__)
+#define IP_REASSEMBLE_ERROR(format, ...) LOG_ERROR("ip_reassemble", format, ##__VA_ARGS__)
+
+struct ip_reassemble_config
+{
+    bool enable_reassemble;
+
+    uint32_t max_cycles;
+    uint32_t max_entries;
+    uint32_t bucket_entries;
+    uint32_t bucket_num;
+};
+
+struct ip_reassemble_manager *ip_reassemble_manager_create(const struct ip_reassemble_config *config);
+void ip_reassemble_manager_destory(struct ip_reassemble_manager *mgr);
+void ip_reassemble_manager_stat(struct ip_reassemble_manager *mgr);
+
+/*
+ * Returns the reassembled packet, or NULL if the packet is not reassembled
+ * The returned packet should be freed by calling the packet_free() function
+ */
+struct packet *ipv4_reassemble_packet(struct ip_reassemble_manager *mgr, const struct packet *pkt);
+struct packet *ipv6_reassemble_packet(struct ip_reassemble_manager *mgr, const struct packet *pkt);
+
+#ifdef __cpluscplus
+}
+#endif
+
+#endif