netdev - [PATCH net-next 3/5] selftests: fib-onlink: Add a test case for IPv4 multicast gateway

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Message-ID: <20260111120813.159799-4-idosch@nvidia.com>
Date: Sun, 11 Jan 2026 14:08:11 +0200
From: Ido Schimmel <idosch@...dia.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	kuba@...nel.org,
	pabeni@...hat.com,
	edumazet@...gle.com,
	dsahern@...nel.org,
	horms@...nel.org,
	petrm@...dia.com,
	Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 3/5] selftests: fib-onlink: Add a test case for IPv4 multicast gateway

A multicast gateway address should be rejected when "onlink" is
specified, but it is only tested as part of the IPv6 tests. Add an
equivalent IPv4 test.

 # ./fib-onlink-tests.sh -v
 [...]
 COMMAND: ip ro add table 254 169.254.101.12/32 via 233.252.0.1 dev veth1 onlink
 Error: Nexthop has invalid gateway.

 TEST: Invalid gw - multicast address                      [ OK ]
 [...]
 COMMAND: ip ro add table 1101 169.254.102.12/32 via 233.252.0.1 dev veth5 onlink
 Error: Nexthop has invalid gateway.

 TEST: Invalid gw - multicast address, VRF                 [ OK ]
 [...]
 Tests passed:  37
 Tests failed:   0

Reviewed-by: Petr Machata <petrm@...dia.com>
Signed-off-by: Ido Schimmel <idosch@...dia.com>
---
 tools/testing/selftests/net/fib-onlink-tests.sh | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/fib-onlink-tests.sh b/tools/testing/selftests/net/fib-onlink-tests.sh
index 63477be859e3..7a0fd7a91e4e 100755
--- a/tools/testing/selftests/net/fib-onlink-tests.sh
+++ b/tools/testing/selftests/net/fib-onlink-tests.sh
@@ -72,7 +72,8 @@ declare -A TEST_NET4IN6IN6
 TEST_NET4IN6[1]=10.1.1.254
 TEST_NET4IN6[2]=10.2.1.254
 
-# mcast address
+# mcast addresses
+MCAST4=233.252.0.1
 MCAST6=ff02::1
 
 VRF=lisa
@@ -310,9 +311,13 @@ invalid_onlink_ipv4()
 {
 	run_ip 254 ${TEST_NET4[1]}.11 ${V4ADDRS[p1]} ${NETIFS[p1]} 2 \
 		"Invalid gw - local unicast address"
+	run_ip 254 ${TEST_NET4[1]}.12 ${MCAST4} ${NETIFS[p1]} 2 \
+		"Invalid gw - multicast address"
 
 	run_ip ${VRF_TABLE} ${TEST_NET4[2]}.11 ${V4ADDRS[p5]} ${NETIFS[p5]} 2 \
 		"Invalid gw - local unicast address, VRF"
+	run_ip ${VRF_TABLE} ${TEST_NET4[2]}.12 ${MCAST4} ${NETIFS[p5]} 2 \
+		"Invalid gw - multicast address, VRF"
 
 	run_ip 254 ${TEST_NET4[1]}.101 ${V4ADDRS[p1]} "" 2 "No nexthop device given"
 }
-- 
2.52.0