BOTH_SYN
case BOTH_SYN: /* move to established */
case BOTH_SYN | TH_FIN: /* one side tries to close */
case BOTH_SYN | (TH_FIN << 8):
case BOTH_SYN | BOTH_FIN: /* both sides closed */
if ((s->st_state & IPFW_STATE_TCPSTATES) != BOTH_SYN)