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selftests/net: enable lo.accept_local in psock_snd test

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The psock_snd test sends and receives packets over loopback, and
the test results depend on parameter settings:
Set rp_filter=0,
or set rp_filter=1 and accept_local=1
so that the test will pass. Otherwise, this test will fail with
Resource temporarily unavailable:
sudo ./psock_snd.sh
dgram
tx: 128
rx: 142
./psock_snd: recv: Resource temporarily unavailable

For most distro kernel releases(like Ubuntu or Centos), the parameter
rp_filter is enabled by default, so it's necessary to enable the
parameter lo.accept_local in psock_snd test. And this test runs
inside a netns, changing a sysctl is fine.

Signed-off-by: luyun <luyun@kylinos.cn>
Reviewed-by: Jackie Liu <liuyun01@kylinos.cn>
Tested-by: Hangbin Liu <liuhangbin@gmail.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/20220525031819.866684-1-luyun_611@163.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
luyun 2022-05-25 11:18:19 +08:00 committed by Jakub Kicinski
parent d0bbe0328f
commit 215cd9897a
1 changed files with 2 additions and 0 deletions
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2
tools/testing/selftests/net/psock_snd.c
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@ -389,6 +389,8 @@ int main(int argc, char **argv)
error(1, errno, "ip link set mtu");
if (system("ip addr add dev lo 172.17.0.1/24"))
error(1, errno, "ip addr add");
if (system("sysctl -w net.ipv4.conf.lo.accept_local=1"))
error(1, errno, "sysctl lo.accept_local");
run_test();