selftests: netfilter: add command usage

Avoid bad command arguments. Based on tools/power/cpupower/bench/cpufreq-bench_plot.sh Signed-off-by: Fabian Frederick <[email protected]> Signed-off-by: Pablo Neira Ayuso <[email protected]>
josf · Aug 28, 2020 · 67afbda · 67afbda
1 parent 2f4bba4
commit 67afbda
Showing 1 changed file with 11 additions and 0 deletions.
diff --git a/tools/testing/selftests/netfilter/nft_flowtable.sh b/tools/testing/selftests/netfilter/nft_flowtable.sh
@@ -86,12 +86,23 @@ omtu=9000
 lmtu=1500
 rmtu=2000
 
+usage(){
+	echo "nft_flowtable.sh [OPTIONS]"
+	echo
+	echo "MTU options"
+	echo "   -o originator"
+	echo "   -l link"
+	echo "   -r responder"
+	exit 1
+}
+
 while getopts "o:l:r:" o
 do
 	case $o in
 		o) omtu=$OPTARG;;
 		l) lmtu=$OPTARG;;
 		r) rmtu=$OPTARG;;
+		*) usage;;
 	esac
 done