Maybe not yet but at least I'd like to do the ARP request a bit later.
We create a RTF_LOCAL route entry for every configured address. So
use this information to emit a "who-has" for the configured address.
This also has the advantage of *not* sending an ARP request if
something wrong happens between the SIOCSIFADDR ioctl and the
RTF_LOCAL route creation.
Ok?
Index: netinet/if_ether.c
===================================================================
RCS file: /cvs/src/sys/netinet/if_ether.c,v
retrieving revision 1.157
diff -u -p -r1.157 if_ether.c
--- netinet/if_ether.c 7 Jul 2015 14:22:25 -0000 1.157
+++ netinet/if_ether.c 7 Jul 2015 15:56:15 -0000
@@ -196,8 +196,11 @@ arp_rtrequest(int req, struct rtentry *r
if ((rt->rt_flags & RTF_CLONING) != 0)
break;
}
- /* Announce a new entry if requested. */
- if (rt->rt_flags & RTF_ANNOUNCE)
+ /*
+ * Announce a new entry if requested or warn the user
+ * if another station has this IP address.
+ */
+ if (rt->rt_flags & (RTF_ANNOUNCE|RTF_LOCAL))
arprequest(ifp,
&satosin(rt_key(rt))->sin_addr.s_addr,
&satosin(rt_key(rt))->sin_addr.s_addr,
@@ -850,12 +853,6 @@ arpproxy(struct in_addr in, u_int rdomai
void
arp_ifinit(struct arpcom *ac, struct ifaddr *ifa)
{
-
- /* Warn the user if another station has this IP address. */
- arprequest(&ac->ac_if,
- &satosin(ifa->ifa_addr)->sin_addr.s_addr,
- &satosin(ifa->ifa_addr)->sin_addr.s_addr,
- ac->ac_enaddr);
ifa->ifa_rtrequest = arp_rtrequest;
}
