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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Author: Brett A C Sheffield <bacs@librecast.net>
# Author: Oscar Maes <oscmaes92@gmail.com>
#
# Ensure destination ethernet field is correctly set for
# broadcast packets
source lib.sh
CLIENT_IP4="192.168.0.1"
GW_IP4="192.168.0.2"
setup() {
setup_ns CLIENT_NS SERVER_NS
ip -net "${SERVER_NS}" link add link1 type veth \
peer name link0 netns "${CLIENT_NS}"
ip -net "${CLIENT_NS}" link set link0 up
ip -net "${CLIENT_NS}" addr add "${CLIENT_IP4}"/24 dev link0
ip -net "${SERVER_NS}" link set link1 up
ip -net "${CLIENT_NS}" route add default via "${GW_IP4}"
ip netns exec "${CLIENT_NS}" arp -s "${GW_IP4}" 00:11:22:33:44:55
}
cleanup() {
rm -f "${CAPFILE}" "${OUTPUT}"
ip -net "${SERVER_NS}" link del link1
cleanup_ns "${CLIENT_NS}" "${SERVER_NS}"
}
test_broadcast_ether_dst() {
local rc=0
CAPFILE=$(mktemp -u cap.XXXXXXXXXX)
OUTPUT=$(mktemp -u out.XXXXXXXXXX)
echo "Testing ethernet broadcast destination"
# start tcpdump listening for icmp
# tcpdump will exit after receiving a single packet
# timeout will kill tcpdump if it is still running after 2s
timeout 2s ip netns exec "${CLIENT_NS}" \
tcpdump -i link0 -c 1 -w "${CAPFILE}" icmp &> "${OUTPUT}" &
pid=$!
slowwait 1 grep -qs "listening" "${OUTPUT}"
# send broadcast ping
ip netns exec "${CLIENT_NS}" \
ping -W0.01 -c1 -b 255.255.255.255 &> /dev/null
# wait for tcpdump for exit after receiving packet
wait "${pid}"
# compare ethernet destination field to ff:ff:ff:ff:ff:ff
ether_dst=$(tcpdump -r "${CAPFILE}" -tnne 2>/dev/null | \
awk '{sub(/,/,"",$3); print $3}')
if [[ "${ether_dst}" == "ff:ff:ff:ff:ff:ff" ]]; then
echo "[ OK ]"
rc="${ksft_pass}"
else
echo "[FAIL] expected dst ether addr to be ff:ff:ff:ff:ff:ff," \
"got ${ether_dst}"
rc="${ksft_fail}"
fi
return "${rc}"
}
if [ ! -x "$(command -v tcpdump)" ]; then
echo "SKIP: Could not run test without tcpdump tool"
exit "${ksft_skip}"
fi
trap cleanup EXIT
setup
test_broadcast_ether_dst
exit $?
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