/*
* Lookup or enter a new address in arptab.
*/
static struct llinfo_arp *
arplookup(addr, create, proxy)
u_long addr;
int create, proxy;
{
register struct rtentry *rt;
static struct sockaddr_inarp sin = {sizeof(sin), AF_INET };
const char *why = 0;
sin.sin_addr.s_addr = addr;
sin.sin_other = proxy ? SIN_PROXY : 0;
rt = rtalloc1((struct sockaddr *)&sin, create, 0UL);
if (rt == 0)
return (0);
rt->rt_refcnt--;
if (rt->rt_flags & RTF_GATEWAY) /* XXX
How can we be sure that rt won't be freeed by
any other kernel thread now ??
XXX */
why = "host is not on local network";
else if ((rt->rt_flags & RTF_LLINFO) == 0)
why = "could not allocate llinfo";
else if (rt->rt_gateway->sa_family != AF_LINK)
why = "gateway route is not ours";
if (why && create) {
log(LOG_DEBUG, "arplookup %s failed: %s\n",
inet_ntoa(sin.sin_addr), why);
return 0;
} else if (why) {
return 0;
}
return ((struct llinfo_arp *)rt->rt_llinfo);
}
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