netdev - Re: [PATCH net-next v4 01/15] net: define IPPROTO_QUIC and SOL

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Message-ID: <a0fee8ef-329d-4286-aa8f-b569b9e4ab03@redhat.com>
Date: Tue, 4 Nov 2025 10:20:19 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: Xin Long <lucien.xin@...il.com>, network dev <netdev@...r.kernel.org>,
 quic@...ts.linux.dev
Cc: davem@...emloft.net, kuba@...nel.org, Eric Dumazet <edumazet@...gle.com>,
 Simon Horman <horms@...nel.org>, Stefan Metzmacher <metze@...ba.org>,
 Moritz Buhl <mbuhl@...nbsd.org>, Tyler Fanelli <tfanelli@...hat.com>,
 Pengtao He <hepengtao@...omi.com>, Thomas Dreibholz <dreibh@...ula.no>,
 linux-cifs@...r.kernel.org, Steve French <smfrench@...il.com>,
 Namjae Jeon <linkinjeon@...nel.org>, Paulo Alcantara <pc@...guebit.com>,
 Tom Talpey <tom@...pey.com>, kernel-tls-handshake@...ts.linux.dev,
 Chuck Lever <chuck.lever@...cle.com>, Jeff Layton <jlayton@...nel.org>,
 Benjamin Coddington <bcodding@...hat.com>, Steve Dickson
 <steved@...hat.com>, Hannes Reinecke <hare@...e.de>,
 Alexander Aring <aahringo@...hat.com>, David Howells <dhowells@...hat.com>,
 Matthieu Baerts <matttbe@...nel.org>, John Ericson <mail@...nericson.me>,
 Cong Wang <xiyou.wangcong@...il.com>, "D . Wythe"
 <alibuda@...ux.alibaba.com>, Jason Baron <jbaron@...mai.com>,
 illiliti <illiliti@...tonmail.com>, Sabrina Dubroca <sd@...asysnail.net>,
 Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
 Daniel Stenberg <daniel@...x.se>,
 Andy Gospodarek <andrew.gospodarek@...adcom.com>
Subject: Re: [PATCH net-next v4 01/15] net: define IPPROTO_QUIC and SOL_QUIC
 constants

On 10/29/25 3:35 PM, Xin Long wrote:
> This patch adds IPPROTO_QUIC and SOL_QUIC constants to the networking
> subsystem. These definitions are essential for applications to set
> socket options and protocol identifiers related to the QUIC protocol.
> 
> QUIC does not possess a protocol number allocated from IANA, and like
> IPPROTO_MPTCP, IPPROTO_QUIC is merely a value used when opening a QUIC
> socket with:
> 
>   socket(AF_INET, SOCK_STREAM, IPPROTO_QUIC);
> 
> Note we did not opt for UDP ULP for QUIC implementation due to several
> considerations:
> 
> - QUIC's connection Migration requires at least 2 UDP sockets for one
>   QUIC connection at the same time, not to mention the multipath
>   feature in one of its draft RFCs.
> 
> - In-Kernel QUIC, as a Transport Protocol, wants to provide users with
>   the TCP or SCTP like Socket APIs, like connect()/listen()/accept()...
>   Note that a single UDP socket might even be used for multiple QUIC
>   connections.
> 
> The use of IPPROTO_QUIC type sockets over UDP tunnel will effectively
> address these challenges and provides a more flexible and scalable
> solution.
> 
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Acked-by: Paolo Abeni <pabeni@...hat.com>