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Commit bb059fb2 authored by Stefano Brivio's avatar Stefano Brivio Committed by David S. Miller
Browse files

selftests: pmtu: Add optional traffic captures for single tests 



If --trace is passed as an option and tcpdump is available,
capture traffic for all relevant interfaces to per-test pcap
files named <test>_<interface>.pcap.

Signed-off-by: default avatarStefano Brivio <sbrivio@redhat.com>
Reviewed-by: default avatarSabrina Dubroca <sd@queasysnail.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 55bbc8ff

tools/testing/selftests/net/pmtu.sh

+53 −7
Original line number Diff line number Diff line
@@ -142,6 +142,7 @@ dummy6_mask="64" 


cleanup_done=1

err_buf=

tcpdump_pids=



err() {

	err_buf="${err_buf}${1}
@@ -284,7 +285,24 @@ setup() { 
	done

}



trace() {

	[ $tracing -eq 0 ] && return



	for arg do

		[ "${ns_cmd}" = "" ] && ns_cmd="${arg}" && continue

		${ns_cmd} tcpdump -s 0 -i "${arg}" -w "${name}_${arg}.pcap" 2> /dev/null &

		tcpdump_pids="${tcpdump_pids} $!"

		ns_cmd=

	done

	sleep 1

}



cleanup() {

	for pid in ${tcpdump_pids}; do

		kill ${pid}

	done

	tcpdump_pids=



	[ ${cleanup_done} -eq 1 ] && return

	for n in ${NS_A} ${NS_B} ${NS_R1} ${NS_R2}; do

		ip netns del ${n} 2> /dev/null
@@ -357,6 +375,10 @@ test_pmtu_ipvX() { 
	family=${1}



	setup namespaces routing || return 2

	trace "${ns_a}"  veth_A-R1    "${ns_r1}" veth_R1-A \

	      "${ns_r1}" veth_R1-B    "${ns_b}"  veth_B-R1 \

	      "${ns_a}"  veth_A-R2    "${ns_r2}" veth_R2-A \

	      "${ns_r2}" veth_R2-B    "${ns_b}"  veth_B-R2



	if [ ${family} -eq 4 ]; then

		ping=ping
@@ -445,6 +467,8 @@ test_pmtu_ipv6_exception() { 


test_pmtu_vti4_exception() {

	setup namespaces veth vti4 xfrm4 || return 2

	trace "${ns_a}" veth_a    "${ns_b}" veth_b \

	      "${ns_a}" vti4_a    "${ns_b}" vti4_b



	veth_mtu=1500

	vti_mtu=$((veth_mtu - 20))
@@ -473,6 +497,8 @@ test_pmtu_vti4_exception() { 


test_pmtu_vti6_exception() {

	setup namespaces veth vti6 xfrm6 || return 2

	trace "${ns_a}" veth_a    "${ns_b}" veth_b \

	      "${ns_a}" vti6_a    "${ns_b}" vti6_b

	fail=0



	# Create route exception by exceeding link layer MTU
@@ -643,29 +669,49 @@ test_pmtu_vti6_link_change_mtu() { 


usage() {

	echo

	echo "$0 [TEST]..."

	echo "$0 [OPTIONS] [TEST]..."

	echo "If no TEST argument is given, all tests will be run."

	echo

	echo "Options"

	echo "  --trace: capture traffic to TEST_INTERFACE.pcap"

	echo

	echo "Available tests${tests}"

	exit 1

}



exitcode=0

desc=0

IFS="	

"



tracing=0

for arg do

	# Check first that all requested tests are available before running any

	if [ "${arg}" != "${arg#--*}" ]; then

		opt="${arg#--}"

		if [ "${opt}" = "trace" ]; then

			if which tcpdump > /dev/null 2>&1; then

				tracing=1

			else

				echo "=== tcpdump not available, tracing disabled"

			fi

		else

			usage

		fi

	else

		# Check first that all requested tests are available before

		# running any

		command -v > /dev/null "test_${arg}" || { echo "=== Test ${arg} not found"; usage; }

	fi

done



trap cleanup EXIT



exitcode=0

desc=0

IFS="	

"

for t in ${tests}; do

	[ $desc -eq 0 ] && name="${t}" && desc=1 && continue || desc=0



	run_this=1

	for arg do

		[ "${arg}" != "${arg#--*}" ] && continue

		[ "${arg}" = "${name}" ] && run_this=1 && break

		run_this=0

	done