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Commit 74cf6795 authored by Paolo Abeni's avatar Paolo Abeni
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Merge branch 'selftests-net-isolate-l2_tos_ttl_inherit-sh-in-its-own-netns' 

Guillaume Nault says:

====================
selftests/net: Isolate l2_tos_ttl_inherit.sh in its own netns.

l2_tos_ttl_inherit.sh uses a veth pair to run its tests, but only one
of the veth interfaces runs in a dedicated netns. The other one remains
in the initial namespace where the existing network configuration can
interfere with the setup used for the tests.

Isolate both veth devices in their own netns and ensure everything gets
cleaned up when the script exits.

Link: https://lore.kernel.org/netdev/924f1062-ab59-9b88-3b43-c44e73a30387@alu.unizg.hr/
====================

Link: https://lore.kernel.org/r/cover.1673191942.git.gnault@redhat.comSigned-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
parents 2ea26b4d d68ff8ad
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Showing with 129 additions and 73 deletions
tools/testing/selftests/net/l2_tos_ttl_inherit.sh
View file @ 74cf6795
......@@ -12,19 +12,27 @@
# In addition this script also checks if forcing a specific field in the
# outer header is working.
# Return 4 by default (Kselftest SKIP code)
ERR=4
if [ "$(id -u)" != "0" ]; then
echo "Please run as root."
exit 0
exit $ERR
fi
if ! which tcpdump > /dev/null 2>&1; then
echo "No tcpdump found. Required for this test."
exit 0
exit $ERR
fi
expected_tos="0x00"
expected_ttl="0"
failed=false
readonly NS0=$(mktemp -u ns0-XXXXXXXX)
readonly NS1=$(mktemp -u ns1-XXXXXXXX)
RUN_NS0="ip netns exec ${NS0}"
get_random_tos() {
# Get a random hex tos value between 0x00 and 0xfc, a multiple of 4
echo "0x$(tr -dc '0-9a-f' < /dev/urandom | head -c 1)\
......@@ -61,7 +69,6 @@ setup() {
local vlan="$5"
local test_tos="0x00"
local test_ttl="0"
local ns="ip netns exec testing"
# We don't want a test-tos of 0x00,
# because this is the value that we get when no tos is set.
......@@ -94,14 +101,15 @@ setup() {
printf "│%7s │%6s │%6s │%13s │%13s │%6s │" \
"$type" "$outer" "$inner" "$tos" "$ttl" "$vlan"
# Create 'testing' netns, veth pair and connect main ns with testing ns
ip netns add testing
ip link add type veth
ip link set veth1 netns testing
ip link set veth0 up
$ns ip link set veth1 up
ip addr flush dev veth0
$ns ip addr flush dev veth1
# Create netns NS0 and NS1 and connect them with a veth pair
ip netns add "${NS0}"
ip netns add "${NS1}"
ip link add name veth0 netns "${NS0}" type veth \
peer name veth1 netns "${NS1}"
ip -netns "${NS0}" link set dev veth0 up
ip -netns "${NS1}" link set dev veth1 up
ip -netns "${NS0}" address flush dev veth0
ip -netns "${NS1}" address flush dev veth1
local local_addr1=""
local local_addr2=""
......@@ -127,51 +135,59 @@ setup() {
if [ "$type" = "gre" ]; then
type="gretap"
fi
ip addr add 198.18.0.1/24 dev veth0
$ns ip addr add 198.18.0.2/24 dev veth1
ip link add name tep0 type $type $local_addr1 remote \
198.18.0.2 tos $test_tos ttl $test_ttl $vxlan $geneve
$ns ip link add name tep1 type $type $local_addr2 remote \
198.18.0.1 tos $test_tos ttl $test_ttl $vxlan $geneve
ip -netns "${NS0}" address add 198.18.0.1/24 dev veth0
ip -netns "${NS1}" address add 198.18.0.2/24 dev veth1
ip -netns "${NS0}" link add name tep0 type $type $local_addr1 \
remote 198.18.0.2 tos $test_tos ttl $test_ttl \
$vxlan $geneve
ip -netns "${NS1}" link add name tep1 type $type $local_addr2 \
remote 198.18.0.1 tos $test_tos ttl $test_ttl \
$vxlan $geneve
elif [ "$outer" = "6" ]; then
if [ "$type" = "gre" ]; then
type="ip6gretap"
fi
ip addr add fdd1:ced0:5d88:3fce::1/64 dev veth0
$ns ip addr add fdd1:ced0:5d88:3fce::2/64 dev veth1
ip link add name tep0 type $type $local_addr1 \
remote fdd1:ced0:5d88:3fce::2 tos $test_tos ttl $test_ttl \
$vxlan $geneve
$ns ip link add name tep1 type $type $local_addr2 \
remote fdd1:ced0:5d88:3fce::1 tos $test_tos ttl $test_ttl \
$vxlan $geneve
ip -netns "${NS0}" address add fdd1:ced0:5d88:3fce::1/64 \
dev veth0 nodad
ip -netns "${NS1}" address add fdd1:ced0:5d88:3fce::2/64 \
dev veth1 nodad
ip -netns "${NS0}" link add name tep0 type $type $local_addr1 \
remote fdd1:ced0:5d88:3fce::2 tos $test_tos \
ttl $test_ttl $vxlan $geneve
ip -netns "${NS1}" link add name tep1 type $type $local_addr2 \
remote fdd1:ced0:5d88:3fce::1 tos $test_tos \
ttl $test_ttl $vxlan $geneve
fi
# Bring L2-tunnel link up and create VLAN on top
ip link set tep0 up
$ns ip link set tep1 up
ip addr flush dev tep0
$ns ip addr flush dev tep1
ip -netns "${NS0}" link set tep0 up
ip -netns "${NS1}" link set tep1 up
ip -netns "${NS0}" address flush dev tep0
ip -netns "${NS1}" address flush dev tep1
local parent
if $vlan; then
parent="vlan99-"
ip link add link tep0 name ${parent}0 type vlan id 99
$ns ip link add link tep1 name ${parent}1 type vlan id 99
ip link set ${parent}0 up
$ns ip link set ${parent}1 up
ip addr flush dev ${parent}0
$ns ip addr flush dev ${parent}1
ip -netns "${NS0}" link add link tep0 name ${parent}0 \
type vlan id 99
ip -netns "${NS1}" link add link tep1 name ${parent}1 \
type vlan id 99
ip -netns "${NS0}" link set dev ${parent}0 up
ip -netns "${NS1}" link set dev ${parent}1 up
ip -netns "${NS0}" address flush dev ${parent}0
ip -netns "${NS1}" address flush dev ${parent}1
else
parent="tep"
fi
# Assign inner IPv4/IPv6 addresses
if [ "$inner" = "4" ] || [ "$inner" = "other" ]; then
ip addr add 198.19.0.1/24 brd + dev ${parent}0
$ns ip addr add 198.19.0.2/24 brd + dev ${parent}1
ip -netns "${NS0}" address add 198.19.0.1/24 brd + dev ${parent}0
ip -netns "${NS1}" address add 198.19.0.2/24 brd + dev ${parent}1
elif [ "$inner" = "6" ]; then
ip addr add fdd4:96cf:4eae:443b::1/64 dev ${parent}0
$ns ip addr add fdd4:96cf:4eae:443b::2/64 dev ${parent}1
ip -netns "${NS0}" address add fdd4:96cf:4eae:443b::1/64 \
dev ${parent}0 nodad
ip -netns "${NS1}" address add fdd4:96cf:4eae:443b::2/64 \
dev ${parent}1 nodad
fi
}
......@@ -192,10 +208,10 @@ verify() {
ping_dst="198.19.0.3" # Generates ARPs which are not IPv4/IPv6
fi
if [ "$tos_ttl" = "inherit" ]; then
ping -i 0.1 $ping_dst -Q "$expected_tos" -t "$expected_ttl" \
2>/dev/null 1>&2 & ping_pid="$!"
${RUN_NS0} ping -i 0.1 $ping_dst -Q "$expected_tos" \
-t "$expected_ttl" 2>/dev/null 1>&2 & ping_pid="$!"
else
ping -i 0.1 $ping_dst 2>/dev/null 1>&2 & ping_pid="$!"
${RUN_NS0} ping -i 0.1 $ping_dst 2>/dev/null 1>&2 & ping_pid="$!"
fi
local tunnel_type_offset tunnel_type_proto req_proto_offset req_offset
if [ "$type" = "gre" ]; then
......@@ -216,10 +232,12 @@ verify() {
req_proto_offset="$((req_proto_offset + 4))"
req_offset="$((req_offset + 4))"
fi
out="$(tcpdump --immediate-mode -p -c 1 -v -i veth0 -n \
ip[$tunnel_type_offset] = $tunnel_type_proto and \
ip[$req_proto_offset] = 0x01 and \
ip[$req_offset] = 0x08 2>/dev/null | head -n 1)"
out="$(${RUN_NS0} tcpdump --immediate-mode -p -c 1 -v \
-i veth0 -n \
ip[$tunnel_type_offset] = $tunnel_type_proto and \
ip[$req_proto_offset] = 0x01 and \
ip[$req_offset] = 0x08 2>/dev/null \
| head -n 1)"
elif [ "$inner" = "6" ]; then
req_proto_offset="44"
req_offset="78"
......@@ -231,10 +249,12 @@ verify() {
req_proto_offset="$((req_proto_offset + 4))"
req_offset="$((req_offset + 4))"
fi
out="$(tcpdump --immediate-mode -p -c 1 -v -i veth0 -n \
ip[$tunnel_type_offset] = $tunnel_type_proto and \
ip[$req_proto_offset] = 0x3a and \
ip[$req_offset] = 0x80 2>/dev/null | head -n 1)"
out="$(${RUN_NS0} tcpdump --immediate-mode -p -c 1 -v \
-i veth0 -n \
ip[$tunnel_type_offset] = $tunnel_type_proto and \
ip[$req_proto_offset] = 0x3a and \
ip[$req_offset] = 0x80 2>/dev/null \
| head -n 1)"
elif [ "$inner" = "other" ]; then
req_proto_offset="36"
req_offset="45"
......@@ -250,11 +270,13 @@ verify() {
expected_tos="0x00"
expected_ttl="64"
fi
out="$(tcpdump --immediate-mode -p -c 1 -v -i veth0 -n \
ip[$tunnel_type_offset] = $tunnel_type_proto and \
ip[$req_proto_offset] = 0x08 and \
ip[$((req_proto_offset + 1))] = 0x06 and \
ip[$req_offset] = 0x01 2>/dev/null | head -n 1)"
out="$(${RUN_NS0} tcpdump --immediate-mode -p -c 1 -v \
-i veth0 -n \
ip[$tunnel_type_offset] = $tunnel_type_proto and \
ip[$req_proto_offset] = 0x08 and \
ip[$((req_proto_offset + 1))] = 0x06 and \
ip[$req_offset] = 0x01 2>/dev/null \
| head -n 1)"
fi
elif [ "$outer" = "6" ]; then
if [ "$type" = "gre" ]; then
......@@ -273,10 +295,12 @@ verify() {
req_proto_offset="$((req_proto_offset + 4))"
req_offset="$((req_offset + 4))"
fi
out="$(tcpdump --immediate-mode -p -c 1 -v -i veth0 -n \
ip6[$tunnel_type_offset] = $tunnel_type_proto and \
ip6[$req_proto_offset] = 0x01 and \
ip6[$req_offset] = 0x08 2>/dev/null | head -n 1)"
out="$(${RUN_NS0} tcpdump --immediate-mode -p -c 1 -v \
-i veth0 -n \
ip6[$tunnel_type_offset] = $tunnel_type_proto and \
ip6[$req_proto_offset] = 0x01 and \
ip6[$req_offset] = 0x08 2>/dev/null \
| head -n 1)"
elif [ "$inner" = "6" ]; then
local req_proto_offset="72"
local req_offset="106"
......@@ -288,10 +312,12 @@ verify() {
req_proto_offset="$((req_proto_offset + 4))"
req_offset="$((req_offset + 4))"
fi
out="$(tcpdump --immediate-mode -p -c 1 -v -i veth0 -n \
ip6[$tunnel_type_offset] = $tunnel_type_proto and \
ip6[$req_proto_offset] = 0x3a and \
ip6[$req_offset] = 0x80 2>/dev/null | head -n 1)"
out="$(${RUN_NS0} tcpdump --immediate-mode -p -c 1 -v \
-i veth0 -n \
ip6[$tunnel_type_offset] = $tunnel_type_proto and \
ip6[$req_proto_offset] = 0x3a and \
ip6[$req_offset] = 0x80 2>/dev/null \
| head -n 1)"
elif [ "$inner" = "other" ]; then
local req_proto_offset="64"
local req_offset="73"
......@@ -307,15 +333,17 @@ verify() {
expected_tos="0x00"
expected_ttl="64"
fi
out="$(tcpdump --immediate-mode -p -c 1 -v -i veth0 -n \
ip6[$tunnel_type_offset] = $tunnel_type_proto and \
ip6[$req_proto_offset] = 0x08 and \
ip6[$((req_proto_offset + 1))] = 0x06 and \
ip6[$req_offset] = 0x01 2>/dev/null | head -n 1)"
out="$(${RUN_NS0} tcpdump --immediate-mode -p -c 1 -v \
-i veth0 -n \
ip6[$tunnel_type_offset] = $tunnel_type_proto and \
ip6[$req_proto_offset] = 0x08 and \
ip6[$((req_proto_offset + 1))] = 0x06 and \
ip6[$req_offset] = 0x01 2>/dev/null \
| head -n 1)"
fi
fi
kill -9 $ping_pid
wait $ping_pid 2>/dev/null
wait $ping_pid 2>/dev/null || true
result="FAIL"
if [ "$outer" = "4" ]; then
captured_ttl="$(get_field "ttl" "$out")"
......@@ -351,11 +379,35 @@ verify() {
}
cleanup() {
ip link del veth0 2>/dev/null
ip netns del testing 2>/dev/null
ip link del tep0 2>/dev/null
ip netns del "${NS0}" 2>/dev/null
ip netns del "${NS1}" 2>/dev/null
}
exit_handler() {
# Don't exit immediately if one of the intermediate commands fails.
# We might be called at the end of the script, when the network
# namespaces have already been deleted. So cleanup() may fail, but we
# still need to run until 'exit $ERR' or the script won't return the
# correct error code.
set +e
cleanup
exit $ERR
}
# Restore the default SIGINT handler (just in case) and exit.
# The exit handler will take care of cleaning everything up.
interrupted() {
trap - INT
exit $ERR
}
set -e
trap exit_handler EXIT
trap interrupted INT
printf "┌────────┬───────┬───────┬──────────────┬"
printf "──────────────┬───────┬────────┐\n"
for type in gre vxlan geneve; do
......@@ -385,6 +437,10 @@ done
printf "└────────┴───────┴───────┴──────────────┴"
printf "──────────────┴───────┴────────┘\n"
# All tests done.
# Set ERR appropriately: it will be returned by the exit handler.
if $failed; then
exit 1
ERR=1
else
ERR=0
fi
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