tcp_req_find_req_for_seq
rc_cur = tcp_req_find_req_for_seq(rack->rc_tp, seq);
rc_cur = tcp_req_find_req_for_seq(rack->rc_tp, (seq + len - 1));
tcp_req = tcp_req_find_req_for_seq(tp, (ae->ack-1));
tcp_req = tcp_req_find_req_for_seq(tp, ae->ack);
tcp_req = tcp_req_find_req_for_seq(tp, (th->th_ack-1));
tcp_req = tcp_req_find_req_for_seq(tp, th->th_ack);
tcp_req_find_req_for_seq(struct tcpcb *tp, tcp_seq seq);