update TCP utils

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;