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#!/usr/bin/env bash
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#
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# Copyright (c) 2017-2021 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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export LC_ALL=C
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#network interface on which to limit traffic
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IF="eth0"
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#limit of the network interface in question
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LINKCEIL="1gbit"
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#limit outbound Bitcoin protocol traffic to this rate
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LIMIT="160kbit"
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#defines the IPv4 address space for which you wish to disable rate limiting
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LOCALNET_V4="192.168.0.0/16"
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#defines the IPv6 address space for which you wish to disable rate limiting
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LOCALNET_V6="fe80::/10"
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#delete existing rules ('Error: Cannot delete qdisc with handle of zero.' means there weren't any.)
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tc qdisc del dev ${IF} root
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#add root class
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tc qdisc add dev ${IF} root handle 1: htb default 10
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#add parent class
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tc class add dev ${IF} parent 1: classid 1:1 htb rate ${LINKCEIL} ceil ${LINKCEIL}
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#add our two classes. one unlimited, another limited
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tc class add dev ${IF} parent 1:1 classid 1:10 htb rate ${LINKCEIL} ceil ${LINKCEIL} prio 0
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tc class add dev ${IF} parent 1:1 classid 1:11 htb rate ${LIMIT} ceil ${LIMIT} prio 1
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#add handles to our classes so packets marked with <x> go into the class with "... handle <x> fw ..."
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tc filter add dev ${IF} parent 1: protocol ip prio 1 handle 1 fw classid 1:10
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tc filter add dev ${IF} parent 1: protocol ip prio 2 handle 2 fw classid 1:11
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if [ -n "${LOCALNET_V6}" ] ; then
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# v6 cannot have the same priority value as v4
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tc filter add dev ${IF} parent 1: protocol ipv6 prio 3 handle 1 fw classid 1:10
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tc filter add dev ${IF} parent 1: protocol ipv6 prio 4 handle 2 fw classid 1:11
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fi
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#delete any existing rules
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#disable for now
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#ret=0
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#while [ $ret -eq 0 ]; do
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# iptables -t mangle -D OUTPUT 1
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# ret=$?
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#done
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#limit outgoing traffic to and from port 8333. but not when dealing with a host on the local network
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# (defined by $LOCALNET_V4 and $LOCALNET_V6)
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# --set-mark marks packages matching these criteria with the number "2" (v4)
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# --set-mark marks packages matching these criteria with the number "4" (v6)
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# these packets are filtered by the tc filter with "handle 2"
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# this filter sends the packages into the 1:11 class, and this class is limited to ${LIMIT}
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iptables -t mangle -A OUTPUT -p tcp -m tcp --dport 8333 ! -d ${LOCALNET_V4} -j MARK --set-mark 0x2
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iptables -t mangle -A OUTPUT -p tcp -m tcp --sport 8333 ! -d ${LOCALNET_V4} -j MARK --set-mark 0x2
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if [ -n "${LOCALNET_V6}" ] ; then
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ip6tables -t mangle -A OUTPUT -p tcp -m tcp --dport 8333 ! -d ${LOCALNET_V6} -j MARK --set-mark 0x4
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ip6tables -t mangle -A OUTPUT -p tcp -m tcp --sport 8333 ! -d ${LOCALNET_V6} -j MARK --set-mark 0x4
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fi
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