selftests: fib-onlink: Add test cases for nexthop device mismatch

Add test cases that verify that when the "onlink" keyword is specified,
both address families (with and without VRF) accept routes with a
gateway address that is reachable via a different interface than the one
specified.

Output without "ipv6: Allow for nexthop device mismatch with "onlink"":

 # ./fib-onlink-tests.sh | grep mismatch
 TEST: nexthop device mismatch                             [ OK ]
 TEST: nexthop device mismatch                             [ OK ]
 TEST: nexthop device mismatch                             [FAIL]
 TEST: nexthop device mismatch                             [FAIL]

Output with "ipv6: Allow for nexthop device mismatch with "onlink"":

 # ./fib-onlink-tests.sh | grep mismatch
 TEST: nexthop device mismatch                             [ OK ]
 TEST: nexthop device mismatch                             [ OK ]
 TEST: nexthop device mismatch                             [ OK ]
 TEST: nexthop device mismatch                             [ OK ]

That is, the IPv4 tests were always passing, but the IPv6 ones only pass
after the specified patch.

Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/20260111120813.159799-6-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/fib-onlink-tests.sh b/tools/testing/selftests/net/fib-onlink-tests.sh
index 7a0fd7a91e4eb71e2299755a68b43073da59a936..b5773ac8847d5e965c7ee71d99ca8f952c36934a 100755 (executable)
--- a/tools/testing/selftests/net/fib-onlink-tests.sh
+++ b/tools/testing/selftests/net/fib-onlink-tests.sh
@@ -271,11 +271,15 @@ valid_onlink_ipv4()
 
        run_ip 254 ${TEST_NET4[1]}.1 ${CONGW[1]} ${NETIFS[p1]} 0 "unicast connected"
        run_ip 254 ${TEST_NET4[1]}.2 ${RECGW4[1]} ${NETIFS[p1]} 0 "unicast recursive"
+       run_ip 254 ${TEST_NET4[1]}.9 ${CONGW[1]} ${NETIFS[p3]} 0 \
+               "nexthop device mismatch"
 
        log_subsection "VRF ${VRF}"
 
        run_ip ${VRF_TABLE} ${TEST_NET4[2]}.1 ${CONGW[3]} ${NETIFS[p5]} 0 "unicast connected"
        run_ip ${VRF_TABLE} ${TEST_NET4[2]}.2 ${RECGW4[2]} ${NETIFS[p5]} 0 "unicast recursive"
+       run_ip ${VRF_TABLE} ${TEST_NET4[2]}.10 ${CONGW[3]} ${NETIFS[p7]} 0 \
+               "nexthop device mismatch"
 
        log_subsection "VRF device, PBR table"
 
@@ -366,12 +370,16 @@ valid_onlink_ipv6()
        run_ip6 254 ${TEST_NET6[1]}::1 ${V6ADDRS[p1]/::*}::64 ${NETIFS[p1]} 0 "unicast connected"
        run_ip6 254 ${TEST_NET6[1]}::2 ${RECGW6[1]} ${NETIFS[p1]} 0 "unicast recursive"
        run_ip6 254 ${TEST_NET6[1]}::3 ::ffff:${TEST_NET4IN6[1]} ${NETIFS[p1]} 0 "v4-mapped"
+       run_ip6 254 ${TEST_NET6[1]}::a ${V6ADDRS[p1]/::*}::64 ${NETIFS[p3]} 0 \
+               "nexthop device mismatch"
 
        log_subsection "VRF ${VRF}"
 
        run_ip6 ${VRF_TABLE} ${TEST_NET6[2]}::1 ${V6ADDRS[p5]/::*}::64 ${NETIFS[p5]} 0 "unicast connected"
        run_ip6 ${VRF_TABLE} ${TEST_NET6[2]}::2 ${RECGW6[2]} ${NETIFS[p5]} 0 "unicast recursive"
        run_ip6 ${VRF_TABLE} ${TEST_NET6[2]}::3 ::ffff:${TEST_NET4IN6[2]} ${NETIFS[p5]} 0 "v4-mapped"
+       run_ip6 ${VRF_TABLE} ${TEST_NET6[2]}::b ${V6ADDRS[p5]/::*}::64 \
+               ${NETIFS[p7]} 0 "nexthop device mismatch"
 
        log_subsection "VRF device, PBR table"