Re: [PATCH v3 2/8] util, flow, pif: Simplify sock_l4_sa() interface

[David Gibson <david@gibson.dropbear.id.au>]

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On Thu, Nov 20, 2025 at 11:05:25AM +1100, David Gibson wrote:
> On Wed, Nov 19, 2025 at 12:42:04PM +0100, Stefano Brivio wrote:
> > On Tue, 18 Nov 2025 14:34:58 +1100
> > David Gibson <david@gibson.dropbear.id.au> wrote:
> > 
> > > On Tue, Nov 18, 2025 at 01:19:21AM +0100, Stefano Brivio wrote:
> > > > On Fri, 14 Nov 2025 10:21:46 +1100
> > > > David Gibson <david@gibson.dropbear.id.au> wrote:
[snip]
> > > I'm not really sure what you mean by an "equivalent untranslated
> > > address".  AFAIK, the only non-wildcard case that will actually listen
> > > on both IP versions is a v4-mapped address.
> > 
> > I mean 192.0.2.1 (untranslated, IPv4) and ::ffff:192.0.2.1 (v4-mapped).
> > Will we ever want to listen to both?
> 
> Maybe one day, but not soon, I think.
> 
> > I don't think we have to care about that right now, though.
> 
> Agreed.

So, I couldn't find anything definitive, but fwiw I did find a couple
things suggesting that v4-mapped addresses probably shouldn't ever
appear on the wire:

https://datatracker.ietf.org/doc/html/draft-itojun-v6ops-v4mapped-harmful-02
https://lwn.net/Articles/688630/

-- 
David Gibson (he or they)	| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you, not the other way
				| around.
http://www.ozlabs.org/~dgibson

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