in_localaddr
int in_localaddr(struct in_addr);
if (inp->inp_af == AF_INET && in_localaddr(in4p_faddr(inp)))
else if (inp->inp_af == AF_INET && in_localaddr(in4p_faddr(inp)))
if (tp->t_mtudisc || in_localaddr(d))
in_localaddr(in4p_faddr(tp->t_inpcb)))
if (in_localaddr(in4p_faddr(tp->t_inpcb))) {
if (inp->inp_af == AF_INET && in_localaddr(in4p_faddr(inp)))