PFTM_UDP_FIRST_PACKET
pf->timeout[PFTM_UDP_FIRST_PACKET] = PFTM_UDP_FIRST_PACKET_VAL;
{ "udp.first", PFTM_UDP_FIRST_PACKET },
s->timeout = PFTM_UDP_FIRST_PACKET;
timeout[PFTM_UDP_FIRST_PACKET] = PFTM_UDP_FIRST_PACKET_VAL;