From 2f5268a9249b87d49ab3c7050f99064e6d1a8bb0 Mon Sep 17 00:00:00 2001
From: Xin Long <lucien.xin@gmail.com>
Date: Mon, 26 Aug 2019 16:30:03 +0800
Subject: [PATCH] sctp: allow users to set netns ecn flag with sysctl

sysctl net.sctp.ecn_enable is added in this patch. It will allow
users to change the default sctp ecn flag, net.sctp.ecn_enable.

This feature was also required on this thread:

  http://lkml.iu.edu/hypermail/linux/kernel/0812.1/01858.html

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/sctp/sysctl.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
index 1250751bca1b..238cf1737576 100644
--- a/net/sctp/sysctl.c
+++ b/net/sctp/sysctl.c
@@ -277,6 +277,13 @@ static struct ctl_table sctp_net_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec,
 	},
+	{
+		.procname	= "ecn_enable",
+		.data		= &init_net.sctp.ecn_enable,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
 	{
 		.procname	= "addr_scope_policy",
 		.data		= &init_net.sctp.scope_policy,