linux-kernel - Re: [PATCH net-next v12 11/22] ovpn: implement TCP transport

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Message-ID: <813d75bf-1d7f-472b-967f-27ab8f9d4759@kernel.org>
Date: Mon, 9 Dec 2024 11:46:44 +0100
From: Matthieu Baerts <matttbe@...nel.org>
To: Antonio Quartulli <antonio@...nvpn.net>, Paolo Abeni <pabeni@...hat.com>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Donald Hunter <donald.hunter@...il.com>, Shuah Khan <shuah@...nel.org>,
 sd@...asysnail.net, ryazanov.s.a@...il.com, Andrew Lunn <andrew@...n.ch>
Cc: Simon Horman <horms@...nel.org>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH net-next v12 11/22] ovpn: implement TCP transport

Hi Antonio,

Thank you for working on this, and sharing your work here!

On 05/12/2024 00:09, Antonio Quartulli wrote:
> On 04/12/2024 23:52, Antonio Quartulli wrote:
>> Paolo,
>>
>> On 04/12/2024 12:15, Antonio Quartulli wrote:
>> [...]
>>>>> +        mutex_lock(&tcp6_prot_mutex);
>>>>> +        if (!ovpn_tcp6_prot.recvmsg)
>>>>> +            ovpn_tcp_build_protos(&ovpn_tcp6_prot, &ovpn_tcp6_ops,
>>>>> +                          sock->sk->sk_prot,
>>>>> +                          sock->sk->sk_socket->ops);
>>>>> +        mutex_unlock(&tcp6_prot_mutex);
>>>>
>>>> This looks like an hack to avoid a build dependency on IPV6, I think
>>>> the
>>>> explicit
>>>
>>> I happily copied this approach from espintcp.c:espintcp_init_sk() :-D
>>>
>>>>
>>>> #if IS_ENABLED(CONFIG_IPV6)
>>>>
>>>> at init time should be preferable
>>
>> To get this done at init time I need inet6_stream_ops to be
>> accessible, but it seems there is no EXPORT_SYMBOL() for this object.
>>
>> However, I see that mptcp/protocol.c is happily accessing it.
>> Any clue how this is possible?
> 
> I answer myself: mptcp is not tristate and it can only be compiled as
> built-in.

Indeed, that's why.

Talking about MPTCP, by chance, do you plan to support it later on? :)

Cheers,
Matt
-- 
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