selftests: fib_nexthops: Test IPv6 route with group after removing IPv4 nexthops

selftests: fib_nexthops: Test IPv6 route with group after removing IPv4 nexthops

Test that an IPv6 route can not use a nexthop group with mixed IPv4 and
IPv6 nexthops, but can use it after deleting the IPv4 nexthops.

Output without previous patch:

# ./fib_nexthops.sh -t ipv6_fcnal_runtime

IPv6 functional runtime
-----------------------
TEST: Route add                                                     [ OK ]
TEST: Route delete                                                  [ OK ]
TEST: Ping with nexthop                                             [ OK ]
TEST: Ping - multipath                                              [ OK ]
TEST: Ping - blackhole                                              [ OK ]
TEST: Ping - blackhole replaced with gateway                        [ OK ]
TEST: Ping - gateway replaced by blackhole                          [ OK ]
TEST: Ping - group with blackhole                                   [ OK ]
TEST: Ping - group blackhole replaced with gateways                 [ OK ]
TEST: IPv6 route with device only nexthop                           [ OK ]
TEST: IPv6 multipath route with nexthop mix - dev only + gw         [ OK ]
TEST: IPv6 route can not have a v4 gateway                          [ OK ]
TEST: Nexthop replace - v6 route, v4 nexthop                        [ OK ]
TEST: Nexthop replace of group entry - v6 route, v4 nexthop         [ OK ]
TEST: IPv6 route can not have a group with v4 and v6 gateways       [ OK ]
TEST: IPv6 route can not have a group with v4 and v6 gateways       [ OK ]
TEST: IPv6 route using a group after deleting v4 gateways           [FAIL]
TEST: Nexthop with default route and rpfilter                       [ OK ]
TEST: Nexthop with multipath default route and rpfilter             [ OK ]

Tests passed:  18
Tests failed:   1

Output with previous patch:

bash-5.0# ./fib_nexthops.sh -t ipv6_fcnal_runtime

IPv6 functional runtime
-----------------------
TEST: Route add                                                     [ OK ]
TEST: Route delete                                                  [ OK ]
TEST: Ping with nexthop                                             [ OK ]
TEST: Ping - multipath                                              [ OK ]
TEST: Ping - blackhole                                              [ OK ]
TEST: Ping - blackhole replaced with gateway                        [ OK ]
TEST: Ping - gateway replaced by blackhole                          [ OK ]
TEST: Ping - group with blackhole                                   [ OK ]
TEST: Ping - group blackhole replaced with gateways                 [ OK ]
TEST: IPv6 route with device only nexthop                           [ OK ]
TEST: IPv6 multipath route with nexthop mix - dev only + gw         [ OK ]
TEST: IPv6 route can not have a v4 gateway                          [ OK ]
TEST: Nexthop replace - v6 route, v4 nexthop                        [ OK ]
TEST: Nexthop replace of group entry - v6 route, v4 nexthop         [ OK ]
TEST: IPv6 route can not have a group with v4 and v6 gateways       [ OK ]
TEST: IPv6 route can not have a group with v4 and v6 gateways       [ OK ]
TEST: IPv6 route using a group after deleting v4 gateways           [ OK ]
TEST: Nexthop with default route and rpfilter                       [ OK ]
TEST: Nexthop with multipath default route and rpfilter             [ OK ]

Tests passed:  19
Tests failed:   0

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>