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: <20251030083446.16b8cefb@kernel.org>
Date: Thu, 30 Oct 2025 08:34:46 -0700
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 Thu, 30 Oct 2025 06:35:18 +0000 Hangbin Liu wrote:
> > This will be annoying For C / C++, and you didn't set the max len 
> > so I think we'll also have to malloc each time. Do we not support
> > display-hint for scalars?  
> 
> Ah, I didn't notice this. Should we convert all the
> 
>  type: binary
>  display-hint: ipv4
> 
> to
> 
>  type: u32
>  byte-order: big-endian
>  display-hint: ipv4

I think we should try. Technically it may change some kernel policies,
but without min/max-like checks the byte-order should be a nop for the
policy.