mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
synced 2025-03-09 00:00:00 +01:00
105 lines
2.8 KiB
Bash
Executable file
105 lines
2.8 KiB
Bash
Executable file
#!/usr/bin/env bash
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#
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# Transparent Network Emulation Proxy for Layer 2 & 3
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#
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# Dependencies: iptables, ebtables and iproute2
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#
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# Author: Steffen Vogel <post@steffenvogel.de>
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# SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
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# SPDX-License-Identifier: Apache-2.0
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set -e # Abort on error
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die() { echo "$1"; exit -1; }
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# Apply netem qdisc also for reverse path
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REVERSE=0
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# This scripts also supports L3 IP packets. Simply replace the MAC by IP addresses
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LAYER=2
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SRC=00:50:C2:4F:92:D5
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DST=00:50:C2:4F:92:D6
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#DST=01:0C:CD:01:01:FF
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MY=$SRC
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SRC_IF=p5p1.10
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DST_IF=p5p1.11
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# Network emulation settings (see http://stuff.onse.fi/man?program=tc-netem§ion=8)
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NETEM="delay 1000000 20000 distribution normal duplicate 4 loss 20"
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###
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# Do not change something below this line!
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MARK=$RANDOM
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# Tools
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TC=/sbin/tc
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if [ "$LAYER" -eq "2" ]; then
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NF=/sbin/ebtables
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elif [ "$LAYER" -eq "3" ]; then
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NF=/sbin/iptables
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fi
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# Test permissions
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(( $(id -u) == 0 )) || die "This script must be executed as root (run: sudo $0)"
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# Test if tools are available
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[ -x $NF ] || die "Please install $NF (run: sudo apt-get install ebtables iptables)"
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[ -x $TC ] || die "Please install $TC (run: sudo apt-get install iproute2)"
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# Load kernel modules
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modprobe sch_netem || die "The netem qdisc is not compiled in this kernel!"
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# Clear tables and chains to get a clean state
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$NF -t nat -F
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$NF -t nat -X
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exit
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# Add new chain, mark packets from $SRC and redirect them to $DEST
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# Insert new chain into flow
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$NF -t nat -A PREROUTING -i $SRC_IF -s $SRC -j mark --mark-set $MARK --mark-target CONTINUE
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$NF -t nat -A PREROUTING -i $SRC_IF -s $SRC -j dnat --to-dst $DST --dnat-target ACCEPT
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$NF -t nat -A PREROUTING -i $DST_IF -s $DST -j mark --mark-set $MARK --mark-target CONTINUE
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$NF -t nat -A PREROUTING -i $DST_IF -s $DST -j dnat --to-dst $SRC --dnat-target ACCEPT
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exit
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# Clean traffic control
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$TC qdisc delete dev $DST_IF root || true
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# Add classful qdisc to egress (outgoing) network device
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$TC qdisc replace dev $DST_IF root handle 4000 prio bands 4 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
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$TC qdisc add dev $DST_IF parent 4000:4 handle 4020 netem $NETEM
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$TC filter add dev $DST_IF protocol ip handle $MARK fw flowid 4000:4
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echo -e "Successfully configured network emulation:"
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echo -e "Netem Settings for $SRC ($SRC_IF) => $DST ($DST_IF):"
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echo -e " $NETEM"
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if (( $REVERSE )); then
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echo -e "Netem Settings for $DST ($DST_IF) => $SRC ($SRC_IF):"
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echo -e " $NETEM_REV"
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fi
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if [ -n $DEBUG ]; then
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if [ "$SRC_IF" == "$DST_IF" ]; then
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IFNS="$SRC_IF"
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else
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IFNS="$SRC_IF $DST_IF"
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fi
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for inf in $IFNS; do
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for cmd in qdisc filter class; do
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echo -e "\nTC ==> $if: $cmd"
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tc -d -p $cmd show dev $inf
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done
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done
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echo -e "\nTABLES ==>"
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$NF -t nat -L
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fi
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