linux-kernel - Re: [PATCH net-next 11/11] tools: ynl: add ipv4-or-v6 display hint

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Message-ID: <228eae2b-5a52-48c0-a3a2-afbd3e45adf2@fiberby.net>
Date: Sat, 6 Sep 2025 15:59:07 +0000
From: Asbjørn Sloth Tønnesen <ast@...erby.net>
To: Donald Hunter <donald.hunter@...il.com>
Cc: "Jason A. Donenfeld" <Jason@...c4.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Simon Horman <horms@...nel.org>, Jacob Keller <jacob.e.keller@...el.com>,
 Andrew Lunn <andrew+netdev@...n.ch>, wireguard@...ts.zx2c4.com,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 11/11] tools: ynl: add ipv4-or-v6 display hint

On 9/5/25 10:53 AM, Donald Hunter wrote:
> Asbjørn Sloth Tønnesen <ast@...erby.net> writes:
>> The attribute WGALLOWEDIP_A_IPADDR can contain either an IPv4
>> or an IPv6 address depending on WGALLOWEDIP_A_FAMILY, however
>> in practice it is enough to look at the attribute length.
>>
>> This patch implements an ipv4-or-v6 display hint, that can
>> deal with this kind of attribute.
>>
>> It only implements this display hint for genetlink-legacy, it
>> can be added to other protocol variants if needed, but we don't
>> want to encourage it's use.
>>
>> Signed-off-by: Asbjørn Sloth Tønnesen <ast@...erby.net>
> 
> Reviewed-by: Donald Hunter <donald.hunter@...il.com>
> 
> I suspect there are occurrences of ipv4 or ipv6 in the existing specs
> that really should be ipv4-or-ipv6 but the python code doesn't care.

I haven't been able to find any, containing 'ip' or 'addr'.

Speaking of display hints, then WGPEER_A_ENDPOINT is another interesting
case, it is struct sockaddr_in or struct sockaddr_in6, I have left that
as a plain binary for now, but maybe that could be a struct map, based
on struct length.

attribute-sets:
   -
     name: wgpeer
     [..]
     attributes:
       [..]
       -
         name: endpoint
         type: binary
         struct-map:
           - sockaddr_in
           - sockaddr_in6

With the requirement being, that all structs must have a unique length.