netdev - [PATCH net-next 1/5] net: define IPPROTO_QUIC and SOL

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Message-ID: <04be849a69b445f8d3d9f6582248fb462211d626.1725935420.git.lucien.xin@gmail.com>
Date: Mon,  9 Sep 2024 22:30:16 -0400
From: Xin Long <lucien.xin@...il.com>
To: network dev <netdev@...r.kernel.org>
Cc: "David S . Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Moritz Buhl <mbuhl@...nbsd.org>,
	Tyler Fanelli <tfanelli@...hat.com>,
	Pengtao He <hepengtao@...omi.com>,
	linux-cifs@...r.kernel.org,
	Steve French <smfrench@...il.com>,
	Namjae Jeon <linkinjeon@...nel.org>,
	Stefan Metzmacher <metze@...ba.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>,
	Steve Dickson <steved@...hat.com>,
	Hannes Reinecke <hare@...e.de>,
	Alexander Aring <aahringo@...hat.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: [PATCH net-next 1/5] net: define IPPROTO_QUIC and SOL_QUIC constants for QUIC protocol

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>
Signed-off-by: Moritz Buhl <mbuhl@...nbsd.org>
Signed-off-by: Tyler Fanelli <tfanelli@...hat.com>
Signed-off-by: Pengtao He <hepengtao@...omi.com>
---
 include/linux/socket.h  | 1 +
 include/uapi/linux/in.h | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/include/linux/socket.h b/include/linux/socket.h
index df9cdb8bbfb8..e9db28c55a37 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -385,6 +385,7 @@ struct ucred {
 #define SOL_MCTP	285
 #define SOL_SMC		286
 #define SOL_VSOCK	287
+#define SOL_QUIC	288
 
 /* IPX options */
 #define IPX_TYPE	1
diff --git a/include/uapi/linux/in.h b/include/uapi/linux/in.h
index 5d32d53508d9..63f900290b96 100644
--- a/include/uapi/linux/in.h
+++ b/include/uapi/linux/in.h
@@ -83,6 +83,8 @@ enum {
 #define IPPROTO_RAW		IPPROTO_RAW
   IPPROTO_SMC = 256,		/* Shared Memory Communications		*/
 #define IPPROTO_SMC		IPPROTO_SMC
+  IPPROTO_QUIC = 261,		/* A UDP-Based Multiplexed and Secure Transport	*/
+#define IPPROTO_QUIC		IPPROTO_QUIC
   IPPROTO_MPTCP = 262,		/* Multipath TCP connection		*/
 #define IPPROTO_MPTCP		IPPROTO_MPTCP
   IPPROTO_MAX
-- 
2.43.0