From: Jiri Benc jbenc@redhat.com

[ Upstream commit fd418b01fe26c2430b1091675cceb3ab2b52e1e0 ]

Many distributions enable rp_filter. However, the flow dissector test generates packets that have 1.1.1.1 set as (inner) source address without this address being reachable. This causes the selftest to fail.

The selftests should not assume a particular initial configuration. Switch off rp_filter.

Fixes: 50b3ed57dee9 ("selftests/bpf: test bpf flow dissection") Signed-off-by: Jiri Benc jbenc@redhat.com Signed-off-by: Daniel Borkmann daniel@iogearbox.net Acked-by: Petar Penkov ppenkov@google.com Link: https://lore.kernel.org/bpf/513a298f53e99561d2f70b2e60e2858ea6cda754.1570539... Signed-off-by: Sasha Levin sashal@kernel.org --- tools/testing/selftests/bpf/test_flow_dissector.sh | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/bpf/test_flow_dissector.sh b/tools/testing/selftests/bpf/test_flow_dissector.sh index d23d4da66b834..e2d06191bd35c 100755 --- a/tools/testing/selftests/bpf/test_flow_dissector.sh +++ b/tools/testing/selftests/bpf/test_flow_dissector.sh @@ -63,6 +63,9 @@ fi

# Setup tc qdisc add dev lo ingress +echo 0 > /proc/sys/net/ipv4/conf/default/rp_filter +echo 0 > /proc/sys/net/ipv4/conf/all/rp_filter +echo 0 > /proc/sys/net/ipv4/conf/lo/rp_filter

echo "Testing IPv4..." # Drops all IP/UDP packets coming from port 9