[PATCH 7/8] selftests: netfilter: add command usage

[Pablo Neira Ayuso]

From: Fabian Frederick <f...@skynet.be>

Avoid bad command arguments.
Based on tools/power/cpupower/bench/cpufreq-bench_plot.sh

Signed-off-by: Fabian Frederick <f...@skynet.be>
Signed-off-by: Pablo Neira Ayuso <pa...@netfilter.org>
---
 tools/testing/selftests/netfilter/nft_flowtable.sh | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tools/testing/selftests/netfilter/nft_flowtable.sh 
b/tools/testing/selftests/netfilter/nft_flowtable.sh
index 44a879826236..431296c0f91c 100755
--- 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
 
-- 
2.20.1