netdev - Re: Sysctl addr_gen_mode does not control tunnel link-local addr

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Date:   Wed, 20 Oct 2021 09:50:18 -0400
From:   Stephen Suryaputra <ssuryaextr@...il.com>
To:     Antonio Quartulli <a@...table.cc>
Cc:     netdev@...r.kernel.org
Subject: Re: Sysctl addr_gen_mode does not control tunnel link-local addr

On Wed, Oct 20, 2021 at 02:59:01PM +0200, Antonio Quartulli wrote:

> For sure, supporting IN6_ADDR_GEN_MODE_NONE is a low hanging fruit and
> should be implemented.
> 
Thanks for reaffirming this!

> Other than my nitpick above, I'd suggest applying the same change to the
> GRE code path, as the behavior should be the same.

> Moreover, do you think that addrconf_add_mroute() should not be executed
> in this case? Otherwise you could simply add your new code into
> add_v4_addrs().

Initially I was thinking that why there is a need to call
addrconf_add_mroute() given the link-local addr hasn't been set. On a
second look, yes, the conditional is better be in add_v4_addrs(). It
will take care of GRE as well.

I'll put a formal patch.

Thanks!