sifaddr
if (!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr)))
if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
int sifaddr(int, u_int32_t, u_int32_t, u_int32_t);