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

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Date: Mon, 11 Mar 2024 12:10:23 -0400
From: Xin Long <lucien.xin@...il.com>
To: network dev <netdev@...r.kernel.org>
Cc: davem@...emloft.net,
	kuba@...nel.org,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Steve French <smfrench@...il.com>,
	Namjae Jeon <linkinjeon@...nel.org>,
	Chuck Lever III <chuck.lever@...cle.com>,
	Jeff Layton <jlayton@...nel.org>,
	Sabrina Dubroca <sd@...asysnail.net>,
	Tyler Fanelli <tfanelli@...hat.com>,
	Pengtao He <hepengtao@...omi.com>
Subject: [RFC 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: 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 cfcb7e2c3813..f6533dd520fd 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -384,6 +384,7 @@ 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 e682ab628dfa..3d7b35d1139a 100644
--- a/include/uapi/linux/in.h
+++ b/include/uapi/linux/in.h
@@ -81,6 +81,8 @@ enum {
 #define IPPROTO_ETHERNET	IPPROTO_ETHERNET
   IPPROTO_RAW = 255,		/* Raw IP packets			*/
 #define IPPROTO_RAW		IPPROTO_RAW
+  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