pf_setup_pdesc
if (pf_setup_pdesc(&pdesc, st->key[PF_SK_WIRE]->af,
action = pf_setup_pdesc(&pd, af, dir, kif, *m0, &reason);
action = pf_setup_pdesc(&pd, af, dir, kif, pd.m, &reason);
int pf_setup_pdesc(struct pf_pdesc *, sa_family_t,