pf_detach_state
pf_detach_state(cur, 0);
void pf_detach_state(struct pf_state *, int);
pf_detach_state(s,
pf_detach_state(s, PF_DT_SKIP_LANEXT|PF_DT_SKIP_EXTGWY);
pf_detach_state(s, PF_DT_SKIP_EXTGWY);
pf_detach_state(s, 0);