[][Add initial mtk feed for OpenWRT v21.02]

[Description]
Add initial mtk feed for OpenWRT v21.02

[Release-log]
N/A

Change-Id: I8051c6ba87f1ccf26c02fdd88a17d66f63c0b101
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/4495320
diff --git a/feed/mtkhnat_util/files/99-firewall b/feed/mtkhnat_util/files/99-firewall
new file mode 100755
index 0000000..9c72762
--- /dev/null
+++ b/feed/mtkhnat_util/files/99-firewall
@@ -0,0 +1,6 @@
+echo "iptables -t mangle -A FORWARD -m dscp --dscp-class BE -j MARK --set-mark 0" >> /etc/firewall.user
+echo "iptables -t mangle -A FORWARD -m dscp --dscp-class CS2 -j MARK --set-mark 2" >> /etc/firewall.user
+echo "iptables -t mangle -A FORWARD -m dscp --dscp-class CS4 -j MARK --set-mark 4" >> /etc/firewall.user
+echo "iptables -t mangle -A FORWARD -m dscp --dscp-class CS6 -j MARK --set-mark 6" >> /etc/firewall.user
+
+exit 0