netdev - [PATCH net-next 3/4] selftests: fcnal: Test SO

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Date: Tue, 9 May 2023 14:02:56 +0200
From: Guillaume Nault <gnault@...hat.com>
To: David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>
Cc: netdev@...r.kernel.org, David Ahern <dsahern@...nel.org>
Subject: [PATCH net-next 3/4] selftests: fcnal: Test SO_DONTROUTE on UDP
 sockets.

Use nettest -G to test the kernel behaviour with UDP sockets having the
SO_DONTROUTE option. Sending packets to a neighbour (on link) host,
should work. When the host is behind a router, sending should fail.

Signed-off-by: Guillaume Nault <gnault@...hat.com>
---
 tools/testing/selftests/net/fcnal-test.sh | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/tools/testing/selftests/net/fcnal-test.sh b/tools/testing/selftests/net/fcnal-test.sh
index 1f8939fbb021..23672cba8781 100755
--- a/tools/testing/selftests/net/fcnal-test.sh
+++ b/tools/testing/selftests/net/fcnal-test.sh
@@ -1655,6 +1655,27 @@ ipv4_udp_novrf()
 	log_start
 	run_cmd nettest -D -d ${NSA_DEV} -r ${a}
 	log_test_addr ${a} $? 2 "No server, device client, local conn"
+
+	#
+	# Link local connection tests (SO_DONTROUTE).
+	# Connections should succeed only when the remote IP address is
+	# on link (doesn't need to be routed through a gateway).
+	#
+
+	a=${NSB_IP}
+	log_start
+	run_cmd_nsb nettest -D -s &
+	sleep 1
+	run_cmd nettest -D -r ${a} -G
+	log_test_addr ${a} $? 0 "SO_DONTROUTE client"
+
+	a=${NSB_LO_IP}
+	log_start
+	show_hint "Should fail 'Network is unreachable' since server is not on link"
+	run_cmd_nsb nettest -D -s &
+	sleep 1
+	run_cmd nettest -D -r ${a} -G
+	log_test_addr ${a} $? 1 "SO_DONTROUTE client"
 }
 
 ipv4_udp_vrf()
-- 
2.30.2