netdev - Re: [PATCH net-next 2/3] netlink: specs: update rt-rule src/dst attribute types to support IPv4 addresses

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Message-ID: <20251105161319.0591f96e@kernel.org>
Date: Wed, 5 Nov 2025 16:13:19 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Hangbin Liu <liuhangbin@...il.com>
Cc: netdev@...r.kernel.org, Donald Hunter <donald.hunter@...il.com>, "David
 S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo
 Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, Jan Stancek
 <jstancek@...hat.com>, "Matthieu Baerts (NGI0)" <matttbe@...nel.org>,
 Asbjørn Sloth Tønnesen <ast@...erby.net>,
 Stanislav Fomichev <sdf@...ichev.me>, Shuah Khan <shuah@...nel.org>, Ido
 Schimmel <idosch@...dia.com>, Guillaume Nault <gnault@...hat.com>, Petr
 Machata <petrm@...dia.com>, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH net-next 2/3] netlink: specs: update rt-rule src/dst
 attribute types to support IPv4 addresses

On Wed, 5 Nov 2025 07:55:47 +0000 Hangbin Liu wrote:
> > > I just realize that most of the address/src/dst in rt-addr/route are
> > > dual stack. The same with FRA_DST. We can't simply change binary to u32.
> > > So can we keep this u32 -> binary change?  
> > 
> > Ah, should have looked at more context..
> > Yes, and in that case without the display-hint?  
> 
> The display-hint is required; otherwise, the displayed src and dst fields
> appear as binary data, and setting the rule’s src/dst values also fails. I
> haven’t checked the code yet, but with
>   - display-hint: ipv4
> the IPv6 addresses are also displayed correctly :)

Heh, we should have called the hint "ip" in that case :)