Date: Fri, 19 Oct 2001 21:14:53 -0500 From: Jonathan Lemon <jlemon@flugsvamp.com> To: Mark Peek <mark@whistle.com> Cc: Harti Brandt <brandt@fokus.gmd.de>, current@FreeBSD.ORG, Jonathan Lemon <jlemon@FreeBSD.ORG> Subject: Re: arp: <some ether addr> is using my IP address 0.0.0.0! ??!?!? Message-ID: <20011019211453.T75389@prism.flugsvamp.com> In-Reply-To: <p05101000b7f66be9c96e@[207.76.207.129]> References: <20011018111945.H1072-100000@beagle.fokus.gmd.de> <p05101000b7f66be9c96e@[207.76.207.129]>
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On Fri, Oct 19, 2001 at 04:58:21PM -0700, Mark Peek wrote:
> At 11:23 AM +0200 10/18/01, Harti Brandt wrote:
> >On Thu, 18 Oct 2001, Max Khon wrote:
> >
> >MK>hi, there!
> >MK>
> >MK>On Thu, Oct 18, 2001 at 12:00:52AM +0200, Jose M. Alcaide wrote:
> >MK>
> >MK>> On Wed, Oct 17, 2001 at 12:11:45PM -0700, Julian Elischer wrote:
> >MK>> > I've seen this when DHCP fails to allocate an address.
> >MK>> >
> >MK>>
> >MK>> But I am not using DHCP. Maybe there are other machines in the LAN (it is
> >MK>> a *big* LAN) trying to get their addresses using DHCP, and now -CURRENT
> >MK>> shows a message whenever detects one of those packets. I will try to
> >MK>> identify the senders (over 40!).
> >MK>>
> >MK>> Anyway, these "0.0.0.0" ARP messages are new in -CURRENT, and none of our
> >MK>> machines running FreeBSD 4.x show them.
> >MK>
> >MK>how current -CURRENT are you running?
> >
> >I have these two on a yesterday's current and remember that they appeared
> >after I saw a commit message approx. 2 weeks ago about adding hashing of
> >inet addresses (maybe rev. 1.83 of if_ether.c).
>
>
> Yes, it does appear to be due to this commit. The first address on the
> interface queue has an address of 0.0.0.0. Here's a patch that works for
> me to block the messages. I'm guessing at the correct behavior so use at
> your own risk. At least the voices^Wlog messages have stopped. :-)
Below is the patch that I've sent to the people who reported the
problem, I'm waiting to hear back from them that it works.
--
Jonathan
Index: if_ether.c
===================================================================
RCS file: /ncvs/src/sys/netinet/if_ether.c,v
retrieving revision 1.85
diff -u -r1.85 if_ether.c
--- if_ether.c 2001/10/17 18:07:05 1.85
+++ if_ether.c 2001/10/19 15:38:07
@@ -593,10 +593,12 @@
isaddr.s_addr == ia->ia_addr.sin_addr.s_addr)
goto match;
/*
- * No match, use the first address on the receive interface
+ * No match, use the first inet address on the receive interface
* as a dummy address for the rest of the function.
*/
- ifa = TAILQ_FIRST(&ifp->if_addrhead);
+ TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
+ if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET)
+ break;
if (ifa == NULL) {
m_freem(m);
return;
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