From ad96352bfdc2865237beca32fd7d50cfef3e75c7 Mon Sep 17 00:00:00 2001

From: Wen Liang <wenliang@redhat.com>

Date: Thu, 1 Jun 2023 10:33:46 -0400

Subject: [PATCH] mptcp: add support for implicit flag

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2109135

Upstream Status: iproute2-next.git commit 3a2535a4

commit 3a2535a41854d481c1a052e267d1fe5d83f9493c

Author: Andrea Claudi <aclaudi@redhat.com>

Date:   Tue May 16 11:48:04 2023 +0200

    mptcp: add support for implicit flag

    Kernel supports implicit flag since commit d045b9eb95a9 ("mptcp:

    introduce implicit endpoints"), included in v5.18.

    Let's add support for displaying it to iproute2.

    Before this change:

    $ ip mptcp endpoint show

    10.0.2.2 id 1 rawflags 10

    After this change:

    $ ip mptcp endpoint show

    10.0.2.2 id 1 implicit

    Signed-off-by: Andrea Claudi <aclaudi@redhat.com>

    Signed-off-by: David Ahern <dsahern@kernel.org>

---

 ip/ipmptcp.c        | 1 +

 man/man8/ip-mptcp.8 | 9 +++++++++

 2 files changed, 10 insertions(+)

diff --git a/ip/ipmptcp.c b/ip/ipmptcp.c

index beba7a41..9847f95b 100644

--- a/ip/ipmptcp.c

+++ b/ip/ipmptcp.c

@@ -58,6 +58,7 @@ static const struct {

 	{ "subflow",		MPTCP_PM_ADDR_FLAG_SUBFLOW },

 	{ "backup",		MPTCP_PM_ADDR_FLAG_BACKUP },

 	{ "fullmesh",		MPTCP_PM_ADDR_FLAG_FULLMESH },

+	{ "implicit",		MPTCP_PM_ADDR_FLAG_IMPLICIT },

 	{ "nobackup",		MPTCP_PM_ADDR_FLAG_NONE },

 	{ "nofullmesh",		MPTCP_PM_ADDR_FLAG_NONE }

 };

diff --git a/man/man8/ip-mptcp.8 b/man/man8/ip-mptcp.8

index 72762f49..b427065c 100644

--- a/man/man8/ip-mptcp.8

+++ b/man/man8/ip-mptcp.8

@@ -176,6 +176,15 @@ endpoint. When the peer does announce addresses, each received ADD_ADDR

 sub-option will trigger creation of an additional subflow to generate a

 full mesh topology.

+.TP

+.BR implicit

+In some scenarios, an MPTCP

+.BR subflow

+can use a local address mapped by a implicit endpoint created by the

+in-kernel path manager. Once set, the implicit flag cannot be removed, but

+other flags can be added to the endpoint. Implicit endpoints cannot be

+created from user-space.

+

 .sp

 .PP

 The

-- 

2.38.1