ctf_challenge_ack
ctf_challenge_ack(m, th, tp, iptos, &ret_val);
ctf_challenge_ack(m, th, tp, iptos, &ret_val);
ctf_challenge_ack(m, th, tp, iptos, &ret_val);
ctf_challenge_ack(m, th, tp, iptos, &ret_val);
ctf_challenge_ack(m, th, tp, iptos, &ret_val);
ctf_challenge_ack(m, th, tp, iptos, &ret_val);
ctf_challenge_ack(m, th, tp, iptos, &ret_val);
ctf_challenge_ack(m, th, tp, iptos, &ret_val);
ctf_challenge_ack(m, th, tp, iptos, &ret_val);
ctf_challenge_ack(m, th, tp, iptos, &ret_val);
ctf_challenge_ack(m, th, tp, iptos, &ret_val);
ctf_challenge_ack(m, th, tp, iptos, &ret_val);
ctf_challenge_ack(struct mbuf *m, struct tcphdr *th,