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Date:   Tue, 07 Apr 2020 18:26:02 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH net] net: icmp6: do not select saddr from iif when
 route has prefsrc set

From: Tim Stallard <>
Date: Fri,  3 Apr 2020 21:22:57 +0100

> Since commit fac6fce9bdb5 ("net: icmp6: provide input address for
> traceroute6") ICMPv6 errors have source addresses from the ingress
> interface. However, this overrides when source address selection is
> influenced by setting preferred source addresses on routes.
> This can result in ICMP errors being lost to upstream BCP38 filters
> when the wrong source addresses are used, breaking path MTU discovery
> and traceroute.
> This patch sets the modified source address selection to only take place
> when the route used has no prefsrc set.
> Fixes: fac6fce9bdb5 ("net: icmp6: provide input address for traceroute6")
> Signed-off-by: Tim Stallard <>

Applied, thanks.

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