tcp session record last packet tcp payload length used to calculate seq of injected RST packets

src/session/session_manager.cpp

@@ -293,6 +293,7 @@ static void tcp_update(struct session_manager *mgr, struct session *sess, enum s
      half->flags |= flags;
      half->seq = tcp_hdr_get_seq(hdr);
      half->ack = tcp_hdr_get_ack(hdr);
+     half->len = tcp_layer->pld_len;
 
      if (!mgr->opts.tcp_reassembly_enable)
      {

src/session/session_priv.h

@@ -28,6 +28,7 @@ struct tcp_half
 
     uint32_t seq;
     uint32_t ack;
+    uint16_t len;
     uint8_t flags;
 };