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selftests: pmtu: Add optional traffic captures for single tests

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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: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefano Brivio 2018-10-12 23:54:14 +02:00 committed by David S. Miller
parent 55bbc8ff49
commit bb059fb204
1 changed files with 54 additions and 8 deletions
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62
tools/testing/selftests/net/pmtu.sh
View File

@ -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
}
for arg do
# Check first that all requested tests are available before running any
command -v > /dev/null "test_${arg}" || { echo "=== Test ${arg} not found"; usage; }
done
trap cleanup EXIT
exitcode=0
desc=0
IFS="
"
tracing=0
for arg do
if [ "${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
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