ifa_ifwithdstaddr
struct ifaddr *ifa_ifwithdstaddr(const struct sockaddr *, int);
ifa = ifa_ifwithdstaddr(dst, fibnum);
ifa = ifa_ifwithdstaddr(gateway, fibnum);
ia = ifatoia(ifa_ifwithdstaddr((struct sockaddr *)sin,
ia = ifatoia(ifa_ifwithdstaddr(sintosa(&dst),
ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr,
(ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),
if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst),