[PATCH net-next 6/7] sctp: add sysctl net.sctp.l3mdev_accept

[Xin Long <lucien.xin@gmail.com>]

This patch is to add sysctl net.sctp.l3mdev_accept to allow
users to change the pernet global l3mdev_accept.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
 Documentation/networking/ip-sysctl.rst |  9 +++++++++
 net/sctp/sysctl.c                      | 11 +++++++++++
 2 files changed, 20 insertions(+)

diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
index 815efc89ad73..096ed1a82cbc 100644
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst
@@ -3100,6 +3100,15 @@ ecn_enable - BOOLEAN
 
         Default: 1
 
+l3mdev_accept - BOOLEAN
+	Enabling this option allows a "global" bound socket to work
+	across L3 master domains (e.g., VRFs) with packets capable of
+	being received regardless of the L3 domain in which they
+	originated. Only valid when the kernel was compiled with
+	CONFIG_NET_L3_MASTER_DEV.
+
+	Default: 1 (enabled)
+
 
 ``/proc/sys/net/core/*``
 ========================
diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
index b46a416787ec..7f40ed117fc7 100644
--- a/net/sctp/sysctl.c
+++ b/net/sctp/sysctl.c
@@ -347,6 +347,17 @@ static struct ctl_table sctp_net_table[] = {
 		.extra1		= &max_autoclose_min,
 		.extra2		= &max_autoclose_max,
 	},
+#ifdef CONFIG_NET_L3_MASTER_DEV
+	{
+		.procname	= "l3mdev_accept",
+		.data		= &init_net.sctp.l3mdev_accept,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= SYSCTL_ONE,
+	},
+#endif
 	{
 		.procname	= "pf_enable",
 		.data		= &init_net.sctp.pf_enable,
-- 
2.31.1