#ifdef TCP_ACK_FILTER
 struct ack_session_info;
 struct ack_session_info {
-       u32 Ack_seq_num;
+       u32 seq_num;
        u32 Bigger_Ack_num;
        u16 src_port;
        u16 dst_port;
 
 static inline int add_TCP_track_session(u32 src_prt, u32 dst_prt, u32 seq)
 {
-       Acks_keep_track_info[Opened_TCP_session].Ack_seq_num = seq;
+       Acks_keep_track_info[Opened_TCP_session].seq_num = seq;
        Acks_keep_track_info[Opened_TCP_session].Bigger_Ack_num = 0;
        Acks_keep_track_info[Opened_TCP_session].src_port = src_prt;
        Acks_keep_track_info[Opened_TCP_session].dst_port = dst_prt;
                                Ack_no  = (((u32)tcp_hdr_ptr[8]) << 24) + (((u32)tcp_hdr_ptr[9]) << 16) + (((u32)tcp_hdr_ptr[10]) << 8) + ((u32)tcp_hdr_ptr[11]);
 
                                for (i = 0; i < Opened_TCP_session; i++) {
-                                       if (Acks_keep_track_info[i].Ack_seq_num == seq_no) {
+                                       if (Acks_keep_track_info[i].seq_num == seq_no) {
                                                Update_TCP_track_session(i, Ack_no);
                                                break;
                                        }