netdev - Re: [PATCH v2 0/2] ipv4: Make neigh lookup keys for loopback/point-to-point devices be INADDR

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Date:   Mon, 15 Jan 2018 16:59:53 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     jwestfall@...realistic.net
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH v2 0/2] ipv4: Make neigh lookup keys for
 loopback/point-to-point devices be INADDR_ANY

From: Jim Westfall <jwestfall@...realistic.net>
Date: Mon, 15 Jan 2018 13:42:38 -0800

> David Miller <davem@...emloft.net> wrote [01.15.18]:
>> From: Jim Westfall <jwestfall@...realistic.net>
>> Date: Sun, 14 Jan 2018 04:18:49 -0800
>> 
>> > This used to be the previous behavior in older kernels but became broken in
>> > a263b3093641f (ipv4: Make neigh lookups directly in output packet path)
>> > and then later removed because it was broken in 0bb4087cbec0 (ipv4: Fix neigh
>> > lookup keying over loopback/point-to-point devices)
>> > 
>> > Not having this results in there being an arp entry for every remote ip
>> > address that the device talks to.  Given a fairly active device it can
>> > cause the arp table to become huge and/or having to add/purge large number
>> > of entires to keep within table size thresholds.
>> ...
>> > v2: 
>> >  - fixes coding style issues
>> 
>> Series applied and queued up for -stable, thank you.
> 
> Thanks for applying these.  We see the same type of behavior with ipv6  
> over point-to-point interfaces and I would like to fix these as well by 
> mapping all the ndisc_cache entries to in6addr_any.  However my knowledge 
> of ndisc is limited and I'm unclear if its safe to assume ndisc, like 
> arp, would never exist on the point-to-point interface.

Ok, hopefully some ipv6 experts can chime in.

Thank you.