Add a ruleset which binds to various interface names via netdev-family
chains and flowtables and massage the notifiers by frequently renaming
interfaces to match these names. While doing so:
- Keep an 'nft monitor' running in background to receive the notifications
- Loop over 'nft list ruleset' to exercise ruleset dump codepath
- Have iperf running so the involved chains/flowtables see traffic
If supported, also test interface wildcard support separately by
creating a flowtable with 'wild*' interface spec and quickly add/remove
matching dummy interfaces.
Signed-off-by: Phil Sutter <phil@xxxxxx>
---
Changes since v4:
- Limit maximum run-time to 48s.
---
.../testing/selftests/net/netfilter/Makefile | 1 +
.../net/netfilter/nft_interface_stress.sh | 151 ++++++++++++++++++
2 files changed, 152 insertions(+)
create mode 100755 tools/testing/selftests/net/netfilter/nft_interface_stress.sh
diff --git a/tools/testing/selftests/net/netfilter/Makefile b/tools/testing/selftests/net/netfilter/Makefile
index d13fb5ea3e89..823e0acf7171 100644
--- a/tools/testing/selftests/net/netfilter/Makefile
+++ b/tools/testing/selftests/net/netfilter/Makefile
@@ -21,6 +21,7 @@ TEST_PROGS += nft_concat_range.sh
TEST_PROGS += nft_conntrack_helper.sh
TEST_PROGS += nft_fib.sh
TEST_PROGS += nft_flowtable.sh
+TEST_PROGS += nft_interface_stress.sh
TEST_PROGS += nft_meta.sh
TEST_PROGS += nft_nat.sh
TEST_PROGS += nft_nat_zones.sh
diff --git a/tools/testing/selftests/net/netfilter/nft_interface_stress.sh b/tools/testing/selftests/net/netfilter/nft_interface_stress.sh
new file mode 100755
index 000000000000..27ef082a09a7
--- /dev/null
+++ b/tools/testing/selftests/net/netfilter/nft_interface_stress.sh
@@ -0,0 +1,151 @@
+#!/bin/bash -e
+#
+# SPDX-License-Identifier: GPL-2.0
+#
+# Torture nftables' netdevice notifier callbacks and related code by frequent
+# renaming of interfaces which netdev-family chains and flowtables hook into.
+
+source lib.sh
+
+checktool "nft --version" "run test without nft tool"
+checktool "iperf3 --version" "run test without iperf3 tool"
+
+# how many seconds to torture the kernel?
+# default to 80% of max run time but don't exceed 48s
+TEST_RUNTIME=$((${kselftest_timeout:-60} * 8 / 10))
+[[ $TEST_RUNTIME -gt 48 ]] && TEST_RUNTIME=48
+
+trap "cleanup_all_ns" EXIT
+
+setup_ns nsc nsr nss
+
+ip -net $nsc link add cr0 type veth peer name rc0 netns $nsr
+ip -net $nsc addr add 10.0.0.1/24 dev cr0
+ip -net $nsc link set cr0 up
+ip -net $nsc route add default via 10.0.0.2
+
+ip -net $nss link add sr0 type veth peer name rs0 netns $nsr
+ip -net $nss addr add 10.1.0.1/24 dev sr0
+ip -net $nss link set sr0 up
+ip -net $nss route add default via 10.1.0.2
+
+ip -net $nsr addr add 10.0.0.2/24 dev rc0
+ip -net $nsr link set rc0 up
+ip -net $nsr addr add 10.1.0.2/24 dev rs0
+ip -net $nsr link set rs0 up
+ip netns exec $nsr sysctl -q net.ipv4.ip_forward=1
+ip netns exec $nsr sysctl -q net.ipv4.conf.all.forwarding=1
+
+{
+ echo "table netdev t {"
+ for ((i = 0; i < 10; i++)); do
+ cat <<-EOF
+ chain chain_rc$i {
+ type filter hook ingress device rc$i priority 0
+ counter
+ }
+ chain chain_rs$i {
+ type filter hook ingress device rs$i priority 0
+ counter
+ }
+ EOF
+ done
+ echo "}"
+ echo "table ip t {"
+ for ((i = 0; i < 10; i++)); do
+ cat <<-EOF
+ flowtable ft_${i} {
+ hook ingress priority 0
+ devices = { rc$i, rs$i }
+ }
+ EOF
+ done
+ echo "chain c {"
+ echo "type filter hook forward priority 0"
+ for ((i = 0; i < 10; i++)); do
+ echo -n "iifname rc$i oifname rs$i "
+ echo "ip protocol tcp counter flow add @ft_${i}"
+ done
+ echo "counter"
+ echo "}"
+ echo "}"
+} | ip netns exec $nsr nft -f - || {
+ echo "SKIP: Could not load nft ruleset"
+ exit $ksft_skip
+}
+
+for ((o=0, n=1; ; o=n, n++, n %= 10)); do
+ ip -net $nsr link set rc$o name rc$n
+ ip -net $nsr link set rs$o name rs$n
+done &
+rename_loop_pid=$!
+
+while true; do ip netns exec $nsr nft list ruleset >/dev/null 2>&1; done &
+nft_list_pid=$!
+
+ip netns exec $nsr nft monitor >/dev/null &
+nft_monitor_pid=$!
+
+ip netns exec $nss iperf3 --server --daemon -1
+summary_expr='s,^\[SUM\] .* \([0-9]\+\) Mbits/sec .* receiver,\1,p'
+rate=$(ip netns exec $nsc iperf3 \
+ --format m -c 10.1.0.1 --time $TEST_RUNTIME \
+ --length 56 --parallel 10 -i 0 | sed -n "$summary_expr")
+
+kill $nft_list_pid
+kill $nft_monitor_pid
+kill $rename_loop_pid
+wait
+
+ip netns exec $nsr nft -f - <<EOF
+table ip t {
+ flowtable ft_wild {
+ hook ingress priority 0
+ devices = { wild* }
+ }
+}
+EOF
+if [[ $? -ne 0 ]]; then
+ echo "SKIP wildcard tests: not supported by host's nft?"
+else
+ for ((i = 0; i < 100; i++)); do
+ ip -net $nsr link add wild$i type dummy &
+ done
+ wait
+ for ((i = 80; i < 100; i++)); do
+ ip -net $nsr link del wild$i &
+ done
+ for ((i = 0; i < 80; i++)); do
+ ip -net $nsr link del wild$i &
+ done
+ wait
+ for ((i = 0; i < 100; i += 10)); do
+ (
+ for ((j = 0; j < 10; j++)); do
+ ip -net $nsr link add wild$((i + j)) type dummy
+ done
+ for ((j = 0; j < 10; j++)); do
+ ip -net $nsr link del wild$((i + j))
+ done
+ ) &
+ done
+ wait
+fi
+
+[[ $(</proc/sys/kernel/tainted) -eq 0 ]] || {
+ echo "FAIL: Kernel is tainted!"
+ exit $ksft_fail
+}
+
+[[ $rate -gt 0 ]] || {
+ echo "FAIL: Zero throughput in iperf3"
+ exit $ksft_fail
+}
+
+[[ -f /sys/kernel/debug/kmemleak && \
+ -n $(</sys/kernel/debug/kmemleak) ]] && {
+ echo "FAIL: non-empty kmemleak report"
+ exit $ksft_fail
+}
+
+exit $ksft_pass
--
2.43.0
