From fc089ae47a3773b35111b4abdcac8192aead4578 Mon Sep 17 00:00:00 2001
From: James White <jamesmacwhite@users.noreply.github.com>
Date: Sat, 14 Jan 2017 08:26:31 +0000
Subject: [PATCH] Add IPv6 support to qos.sh

---
 contrib/qos/README.md |  4 ++--
 contrib/qos/tc.sh     | 30 ++++++++++++++++++++++--------
 2 files changed, 24 insertions(+), 10 deletions(-)

diff --git a/contrib/qos/README.md b/contrib/qos/README.md
index 5e0a975fc6..0ded87c58f 100644
--- a/contrib/qos/README.md
+++ b/contrib/qos/README.md
@@ -1,5 +1,5 @@
-### Qos ###
+### QoS (Quality of service) ###
 
-This is a Linux bash script that will set up tc to limit the outgoing bandwidth for connections to the Bitcoin network. It limits outbound TCP traffic with a source or destination port of 8333, but not if the destination IP is within a LAN (defined as 192.168.x.x).
+This is a Linux bash script that will set up tc to limit the outgoing bandwidth for connections to the Bitcoin network. It limits outbound TCP traffic with a source or destination port of 8333, but not if the destination IP is within a LAN.
 
 This means one can have an always-on bitcoind instance running, and another local bitcoind/bitcoin-qt instance which connects to this node and receives blocks from it.
diff --git a/contrib/qos/tc.sh b/contrib/qos/tc.sh
index aaf5e1fa11..0d1dd65b4f 100644
--- a/contrib/qos/tc.sh
+++ b/contrib/qos/tc.sh
@@ -1,4 +1,4 @@
-# Copyright (c) 2013 The Bitcoin Core developers
+# Copyright (c) 2017 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -8,8 +8,10 @@ IF="eth0"
 LINKCEIL="1gbit"
 #limit outbound Bitcoin protocol traffic to this rate
 LIMIT="160kbit"
-#defines the address space for which you wish to disable rate limiting
-LOCALNET="192.168.0.0/16"
+#defines the IPv4 address space for which you wish to disable rate limiting
+LOCALNET_V4="192.168.0.0/16"
+#defines the IPv6 address space for which you wish to disable rate limiting
+LOCALNET_V6="fe80::/10"
 
 #delete existing rules
 tc qdisc del dev ${IF} root
@@ -28,6 +30,12 @@ tc class add dev ${IF} parent 1:1 classid 1:11 htb rate ${LIMIT} ceil ${LIMIT} p
 tc filter add dev ${IF} parent 1: protocol ip prio 1 handle 1 fw classid 1:10
 tc filter add dev ${IF} parent 1: protocol ip prio 2 handle 2 fw classid 1:11
 
+if [ ! -z "${LOCALNET_V6}" ] ; then
+	# v6 cannot have the same priority value as v4
+	tc filter add dev ${IF} parent 1: protocol ipv6 prio 3 handle 1 fw classid 1:10
+	tc filter add dev ${IF} parent 1: protocol ipv6 prio 4 handle 2 fw classid 1:11
+fi
+
 #delete any existing rules
 #disable for now
 #ret=0
@@ -37,9 +45,15 @@ tc filter add dev ${IF} parent 1: protocol ip prio 2 handle 2 fw classid 1:11
 #done
 
 #limit outgoing traffic to and from port 8333. but not when dealing with a host on the local network
-#	(defined by $LOCALNET)
-#	--set-mark marks packages matching these criteria with the number "2"
-#	these packages are filtered by the tc filter with "handle 2"
+#	(defined by $LOCALNET_V4 and $LOCALNET_V6)
+#	--set-mark marks packages matching these criteria with the number "2" (v4)
+#	--set-mark marks packages matching these criteria with the number "4" (v6)
+#	these packets are filtered by the tc filter with "handle 2"
 #	this filter sends the packages into the 1:11 class, and this class is limited to ${LIMIT}
-iptables -t mangle -A OUTPUT -p tcp -m tcp --dport 8333 ! -d ${LOCALNET} -j MARK --set-mark 0x2
-iptables -t mangle -A OUTPUT -p tcp -m tcp --sport 8333 ! -d ${LOCALNET} -j MARK --set-mark 0x2
+iptables -t mangle -A OUTPUT -p tcp -m tcp --dport 8333 ! -d ${LOCALNET_V4} -j MARK --set-mark 0x2
+iptables -t mangle -A OUTPUT -p tcp -m tcp --sport 8333 ! -d ${LOCALNET_V4} -j MARK --set-mark 0x2
+
+if [ ! -z "${LOCALNET_V6}" ] ; then
+	ip6tables -t mangle -A OUTPUT -p tcp -m tcp --dport 8333 ! -d ${LOCALNET_V6} -j MARK --set-mark 0x4
+	ip6tables -t mangle -A OUTPUT -p tcp -m tcp --sport 8333 ! -d ${LOCALNET_V6} -j MARK --set-mark 0x4
+fi