From 4d15174b5d42be9cfc87b47c6ee042163e4550ce Mon Sep 17 00:00:00 2001
From: "Ycarus (Yannick Chabanois)" <ycarus@zugaina.org>
Date: Mon, 19 Oct 2020 16:20:53 +0200
Subject: [PATCH] Add interface additional latency settings

---
 .../root/etc/init.d/openmptcprouter              | 16 ++++++++++++++++
 .../resources/view/network/interfaces.js         |  4 ++++
 2 files changed, 20 insertions(+)

diff --git a/luci-app-openmptcprouter/root/etc/init.d/openmptcprouter b/luci-app-openmptcprouter/root/etc/init.d/openmptcprouter
index 46fc817b7..8309d6c2d 100755
--- a/luci-app-openmptcprouter/root/etc/init.d/openmptcprouter
+++ b/luci-app-openmptcprouter/root/etc/init.d/openmptcprouter
@@ -23,8 +23,24 @@ omr_intf_set() {
 	config_get ifname "$1" ifname
 	config_get device "$1" device
 	config_get proto "$1" proto
+	config_get addlatency "$1" addlatency "0"
 	devicename=$(echo "$device" | cut -d'/' -f3)
 
+	[ -z "$ifname" ] && ifname=$(ifstatus "$1" | jsonfilter -q -e '@["l3_device"]')
+
+	if [ -n "$ifname" ]; then
+		if [ "$addlatency" = "0" ] && [ "$(tc qdisc show $ifname | grep delay)" != "" ]; then
+			tc qdisc del dev ${ifname} root netem
+		fi
+		if [ "$addlatency" != "0" ]; then
+			if [ "$(tc qdisc show $ifname | grep delay)" != "" ]; then
+				tc qdisc add dev ${ifname} root netem delay ${addlatency}ms
+			elif [ "$(tc qdisc show $ifname | awk '/delay/ { print $10 }' | sed 's/ms//')" != "$addlatency" ]; then
+				tc qdisc replace dev ${ifname} root netem delay ${addlatency}ms
+			fi
+		fi
+	fi
+
 	if [ -n "$ifname" ] && [ -f /sys/class/net/${ifname}/device/uevent ]; then
 		devicepath=$(readlink -f /sys/class/net/${ifname})
 		if [ -n "$devicepath" ] && [ "$(echo ${devicepath} | grep virtual)" = "" ]; then
diff --git a/luci-mod-network/htdocs/luci-static/resources/view/network/interfaces.js b/luci-mod-network/htdocs/luci-static/resources/view/network/interfaces.js
index 995515f01..5cd091920 100644
--- a/luci-mod-network/htdocs/luci-static/resources/view/network/interfaces.js
+++ b/luci-mod-network/htdocs/luci-static/resources/view/network/interfaces.js
@@ -575,6 +575,10 @@ return view.extend({
 				o.value('backup',_('Backup'));
 				o.default = 'off';
 
+				o = s.taboption('advanced', form.Value, 'addlatency', _('Additional latency'));
+				o.datatype = 'uinteger';
+				o.default = '0';
+
 				if (L.hasSystemFeature('dnsmasq') || L.hasSystemFeature('odhcpd')) {
 					o = s.taboption('dhcp', form.SectionValue, '_dhcp', form.TypedSection, 'dhcp');
 					o.depends('proto', 'static');