Add tcp reassembly

src/tcp_reassembly/tcp_reassembly.h

@@ -0,0 +1,45 @@
+#ifndef _TCP_REASSEMBLY_H
+#define _TCP_REASSEMBLY_H
+
+#ifdef __cpluscplus
+extern "C"
+{
+#endif
+
+#include "log.h"
+
+#include <stdint.h>
+
+#define TCP_REASSEMBLE_DEBUG(format, ...) LOG_DEBUG("tcp_reassembly", format, ##__VA_ARGS__)
+#define TCP_REASSEMBLE_ERROR(format, ...) LOG_ERROR("tcp_reassembly", format, ##__VA_ARGS__)
+
+struct tcp_reassembly_stat
+{
+    uint64_t packets; // current packets
+    uint64_t bytes;   // current bytes
+
+    uint64_t tcp_segement_timout; // total tcp segment timeout
+};
+
+/*
+ * If retransmission or overlap occurs, the old data packet may have been consumed by the upper-layer plug-in,
+ * so the old data packet takes priority and the new data packet will be bypassed.
+ */
+
+struct tcp_reassembly *tcp_reassembly_new(bool enable, uint32_t max_timeout, uint32_t max_packets, uint32_t max_bytes);
+void tcp_reassembly_init(struct tcp_reassembly *assembler, uint32_t c2s_init_seq, uint32_t s2c_init_seq);
+void tcp_reassembly_free(struct tcp_reassembly *assembler);
+void tcp_reassembly_expire(struct tcp_reassembly *assembler, uint64_t now);
+
+// direction: 1 C2S; 2: S2C
+void tcp_reassembly_update(struct tcp_reassembly *assembler, int direction, uint32_t offset, const char *payload, uint32_t len, uint64_t now);
+const char *tcp_reassembly_peek(struct tcp_reassembly *assembler, int direction, uint32_t *len);
+void tcp_reassembly_consume(struct tcp_reassembly *assembler, int direction, uint32_t len);
+
+struct tcp_reassembly_stat *tcp_reassembly_get_stat(struct tcp_reassembly *assembler);
+
+#ifdef __cpluscplus
+}
+#endif
+
+#endif