PFTM_UDP_FIRST_PACKET
s->timeout = PFTM_UDP_FIRST_PACKET;
my_timeout[PFTM_UDP_FIRST_PACKET] = 60; /* First UDP packet */
pf->timeout[PFTM_UDP_FIRST_PACKET] = PFTM_UDP_FIRST_PACKET_VAL;
{ "udp.first", PFTM_UDP_FIRST_PACKET },