is_send
ips.is_send, ips.is_dend,
is->is_send = ntohl(tcp->th_seq) + fin->fin_dlen -
is->is_maxsend = is->is_send;
clone->is_send = 0;
clone->is_send = send;
is->is_send = ntohl(tcp->th_seq);
is->is_send = ntohl(tcp->th_ack);
is->is_maxsend = is->is_send + 1;