From e1f8bc06e49794ebecc0f276429a7ab9f105ac06 Mon Sep 17 00:00:00 2001 From: Phil Sutter Date: Wed, 3 Nov 2021 19:53:42 +0100 Subject: [PATCH] selftests: nft_nat: Improve port shadow test stability Setup phase in test_port_shadow() relied upon a race-condition: Listening nc on port 1405 was started in background before attempting to create the fake conntrack entry using the same source port. If listening nc won, fake conntrack entry could not be created causing wrong behaviour. Reorder nc calls to fix this and introduce a short delay before testing the setup to wait for listening nc process startup. Fixes: 465f15a6d1a8f ("selftests: nft_nat: add udp hole punch test case") Signed-off-by: Phil Sutter Signed-off-by: Pablo Neira Ayuso --- tools/testing/selftests/netfilter/nft_nat.sh | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/netfilter/nft_nat.sh b/tools/testing/selftests/netfilter/nft_nat.sh index da1c1e4b6c86..905c033db74d 100755 --- a/tools/testing/selftests/netfilter/nft_nat.sh +++ b/tools/testing/selftests/netfilter/nft_nat.sh @@ -759,14 +759,16 @@ test_port_shadow() local result="" local logmsg="" + # make shadow entry, from client (ns2), going to (ns1), port 41404, sport 1405. + echo "fake-entry" | ip netns exec "$ns2" nc -w 1 -p 1405 -u "$daddrc" 41404 > /dev/null + echo ROUTER | ip netns exec "$ns0" nc -w 5 -u -l -p 1405 >/dev/null 2>&1 & nc_r=$! echo CLIENT | ip netns exec "$ns2" nc -w 5 -u -l -p 1405 >/dev/null 2>&1 & nc_c=$! - # make shadow entry, from client (ns2), going to (ns1), port 41404, sport 1405. - echo "fake-entry" | ip netns exec "$ns2" nc -w 1 -p 1405 -u "$daddrc" 41404 > /dev/null + sleep 0.3 # ns1 tries to connect to ns0:1405. With default settings this should connect # to client, it matches the conntrack entry created above.