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