pf_calc_mss
u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t, int,
mss = pf_calc_mss(pd->src, pd->af, rtid, mss, mssdflt);
mss = pf_calc_mss(pd->dst, pd->af, rtid, mss, mssdflt);
mss = pf_calc_mss(pd->src, pd->af, rtid, mss, mssdflt);
mss = pf_calc_mss(pd->dst, pd->af, rtid, mss, mssdflt);