netdev - [PATCH bpf 1/2] selftests/bpf: set rp_filter in test_flow

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Date:   Tue,  8 Oct 2019 15:10:44 +0200
From:   Jiri Benc <jbenc@...hat.com>
To:     bpf@...r.kernel.org, netdev@...r.kernel.org
Cc:     Petar Penkov <ppenkov@...gle.com>
Subject: [PATCH bpf 1/2] selftests/bpf: set rp_filter in test_flow_dissector

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")
Cc: Petar Penkov <ppenkov@...gle.com>
Signed-off-by: Jiri Benc <jbenc@...hat.com>
---
 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 d23d4da66b83..e2d06191bd35 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
-- 
2.18.1