[PATCH AUTOSEL 5.3 29/99] selftests/bpf: Set rp_filter in test_flow_dissector

[Sasha Levin]

From: Jiri Benc <jbenc@xxxxxxxxxx>

[ 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@xxxxxxxxxx>
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Acked-by: Petar Penkov <ppenkov@xxxxxxxxxx>
Link: https://lore.kernel.org/bpf/513a298f53e99561d2f70b2e60e2858ea6cda754.1570539863.git.jbenc@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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
-- 
2.20.1