ifaof_ifpforaddr
ifa = ifaof_ifpforaddr(addr, ifp);
struct ifaddr *ifaof_ifpforaddr(const struct sockaddr *, struct ifnet *);
nifa = ifaof_ifpforaddr(dst, ifa->ifa_ifp);
ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev);
ifa = ifaof_ifpforaddr(&sa, &sc->sc_if);
ifa = ifaof_ifpforaddr(&sa, ifp);
ifa = ifaof_ifpforaddr(&sa, ifp);
ifa = ifaof_ifpforaddr(&sa, sc->sc_carpdev);
ifa = ifaof_ifpforaddr(sintosa(&icmpdst), rcvif);
ifa = ifaof_ifpforaddr(sintosa(&ipaddr),
ifa = ifaof_ifpforaddr(l3addr, ifp);