ifa_ifwithaddr_check
int ifa_ifwithaddr_check(const struct sockaddr *);
ifa_ifwithaddr_check((const struct sockaddr *)&sin) == 0)
if (ifa_ifwithaddr_check((struct sockaddr *)gateway))
if (ifa_ifwithaddr_check((struct sockaddr *)&ipaddr)
if (ifa_ifwithaddr_check((SA)&ipaddr) == 0)
ifa_ifwithaddr_check((struct sockaddr *)addr) == 0))