From b6e9debc1b97f9e4be70fb51404831ed870d844a Mon Sep 17 00:00:00 2001
From: Florian Eckert <fe@dev.tdt.de>
Date: Thu, 22 Jun 2017 11:48:01 +0200
Subject: [PATCH] net/mwan3: add lock for mwan3 hotplug script

If more then one interface get up/down at once mwan3 could be in a
undefined state, because more then one mwan3 hotplug script are running
and editing the iptables.

Lock the critical section should solve this issue.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>
---
 net/mwan3/files/etc/hotplug.d/iface/15-mwan3 | 3 +++
 net/mwan3/files/lib/mwan3/mwan3.sh           | 8 ++++++++
 2 files changed, 11 insertions(+)

diff --git a/net/mwan3/files/etc/hotplug.d/iface/15-mwan3 b/net/mwan3/files/etc/hotplug.d/iface/15-mwan3
index e3fd16cef..ca8f24daf 100644
--- a/net/mwan3/files/etc/hotplug.d/iface/15-mwan3
+++ b/net/mwan3/files/etc/hotplug.d/iface/15-mwan3
@@ -38,6 +38,7 @@ if [ "$ACTION" == "ifup" ]; then
 	[ -n "$gateway" ] || exit 9
 fi
 
+mwan3_lock
 $LOG notice "$ACTION interface $INTERFACE (${DEVICE:-unknown})"
 
 case "$ACTION" in
@@ -64,4 +65,6 @@ case "$ACTION" in
 	;;
 esac
 
+mwan3_unlock
+
 exit 0
diff --git a/net/mwan3/files/lib/mwan3/mwan3.sh b/net/mwan3/files/lib/mwan3/mwan3.sh
index 3798d7eb0..f4c55a96e 100644
--- a/net/mwan3/files/lib/mwan3/mwan3.sh
+++ b/net/mwan3/files/lib/mwan3/mwan3.sh
@@ -8,6 +8,14 @@ IPT6="ip6tables -t mangle -w"
 LOG="logger -t mwan3 -p"
 CONNTRACK_FILE="/proc/net/nf_conntrack"
 
+mwan3_lock() {
+	lock /var/run/mwan3.lock
+}
+
+mwan3_unlock() {
+	lock -u /var/run/mwan3.lock
+}
+
 mwan3_get_iface_id()
 {
 	local _tmp _iface _iface_count