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selftests: netfilter: add phony nft_offload test

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... "phony", because its not testing offloads, it tests the control
plane code.  Also test error unwind via fault injection framework.

For a proper test, real hardware would be required given we'd have
check if 'previously handed off to hardware' offload commands are
properly removed again on failure or rule flush.

Signed-off-by: Florian Westphal <fw@strlen.de>
Link: https://patch.msgid.link/20260612092209.11966-3-fw@strlen.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Florian Westphal 2026-06-12 11:22:09 +02:00 committed by Jakub Kicinski
parent 07ca2ab4ce
commit 5394aa0bb0
3 changed files with 139 additions and 0 deletions
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1
tools/testing/selftests/net/netfilter/Makefile
View File

@ -32,6 +32,7 @@ TEST_PROGS := \
nft_meta.sh \
nft_nat.sh \
nft_nat_zones.sh \
nft_offload.sh \
nft_queue.sh \
nft_synproxy.sh \
nft_tproxy_tcp.sh \

6
tools/testing/selftests/net/netfilter/config
View File

@ -11,7 +11,12 @@ CONFIG_BRIDGE_NF_EBTABLES_LEGACY=m
CONFIG_BRIDGE_VLAN_FILTERING=y
CONFIG_CGROUP_BPF=y
CONFIG_CRYPTO_SHA1=m
CONFIG_DEBUG_FS=y
CONFIG_DUMMY=m
CONFIG_FAIL_FUNCTION=y
CONFIG_FAULT_INJECTION=y
CONFIG_FAULT_INJECTION_DEBUG_FS=y
CONFIG_FUNCTION_ERROR_INJECTION=y
CONFIG_INET_DIAG=m
CONFIG_INET_ESP=m
CONFIG_INET_SCTP_DIAG=m
@ -36,6 +41,7 @@ CONFIG_IP_VS_RR=m
CONFIG_MACVLAN=m
CONFIG_NAMESPACES=y
CONFIG_NET_CLS_U32=m
CONFIG_NETDEVSIM=m
CONFIG_NETFILTER=y
CONFIG_NETFILTER_ADVANCED=y
CONFIG_NETFILTER_NETLINK=m

132
tools/testing/selftests/net/netfilter/nft_offload.sh Executable file
View File

@ -0,0 +1,132 @@
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
source lib.sh
checktool "nft --version" "run test without nft tool"
modprobe -q netdevsim
sysfs="/sys/kernel/debug/fail_function"
failname="/proc/self/make-it-fail"
duration=30
fault=0
ret=0
file_ft=""
file_rs=""
id=$((RANDOM%65536))
read -r t < /proc/sys/kernel/tainted
if [ "$t" -ne 0 ];then
echo SKIP: kernel is tainted
exit $ksft_skip
fi
cleanup() {
cleanup_netdevsim "$id" "$NS"
cleanup_ns "$NS"
[ "$fault" -eq 1 ] && echo '!nsim_setup_tc' > "$sysfs/inject"
rm -f "$file_ft" "$file_rs"
}
trap cleanup EXIT
skip() {
echo "SKIP: $*"
[ $ret -eq 0 ] && exit 4
exit $ret
}
set -e
setup_ns NS
create_netdevsim "$id" "$NS" >/dev/null
nsim_port=$(create_netdevsim_port "$id" "$NS" 2)
file_ft=$(mktemp)
cat > "$file_ft" <<EOF
flush ruleset
table inet t {
flowtable f {
flags offload
hook ingress priority filter + 10
devices = { "$nsim_port", "dummyf1" }
}
chain cf {
type filter hook forward priority 0; policy accept;
ct state new meta l4proto tcp flow add @f
}
}
EOF
if ip netns exec "$NS" nft -f "$file_ft"; then
echo "PASS: flowtable offload"
else
echo "FAIL: flowtable offload"
ret=1
fi
file_rs=$(mktemp)
cat > "$file_rs" <<EOF
table netdev t {
chain c {
type filter hook ingress device $nsim_port priority 1
flags offload
ip saddr 10.2.1.1 ip daddr 10.2.1.2 ip protocol icmp accept
ip saddr 10.2.1.1 ip daddr 10.2.1.3 ip protocol icmp drop
ip saddr 10.2.1.0/24 ip daddr 10.2.1.0/24 ip protocol icmp accept
ip6 saddr dead:beef::1 ip6 daddr dead:beef::2 meta l4proto ipv6-icmp accept
ip6 saddr dead:beef::1 ip6 daddr dead:beef::3 meta l4proto ipv6-icmp drop
ip6 saddr dead:beef::/64 ip6 daddr dead:beef::/64 meta l4proto ipv6-icmp accept
}
}
EOF
if ip netns exec "$NS" nft -f "$file_rs"; then
echo "PASS: ruleset offload"
else
echo "FAIL: ruleset offload"
ret=1
fi
test -d "$sysfs" || skip "$sysfs not present"
grep -q nsim_setup_tc "$sysfs/injectable" || skip "nsim_setup_tc fault injection not available"
echo Y > "$sysfs/task-filter"
echo 0 > "$sysfs/verbose"
echo "nsim_setup_tc" > "$sysfs/inject"
fault=1
p=$(((RANDOM%90) + 10))
echo $p > "$sysfs/probability"
echo -1 > "$sysfs/times"
count=0
ok=0
now=$(date +%s)
stop=$((now+duration))
# fault-injection enabled rule loads are expected to fail.
set +e
while [ "$now" -le "$stop" ]; do
for f in "$file_ft" "$file_rs"; do
if ip netns exec "$NS" bash -c "echo 1 > $failname ; ip netns exec \"$NS\" nft -f $f" 2> /dev/null;then
ok=$((ok+1))
fi
count=$((count+1))
done
now=$(date +%s)
done
sleep 5
read -r t < /proc/sys/kernel/tainted
if [ "$t" -eq 0 ];then
echo "PASS: Not tainted. $count rounds, $ok successful ruleset loads with P $p."
else
echo "ERROR: Tainted. $count rounds, $ok successful ruleset loads with P $p."
dmesg
ret=1
fi
exit $ret