selftests: test_vxlan_fdb_changelink: Add a test for MC remote change

Changes to MC remote need to be reflected in actual group memberships.
Add a test to verify that it is the case.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/tools/testing/selftests/net/test_vxlan_fdb_changelink.sh b/tools/testing/selftests/net/test_vxlan_fdb_changelink.sh
index 6f2bca4b346c8389c231a98c1391889e6f593ea3..062f957950af3d99804b9f8ec30a283d433e9420 100755 (executable)
--- a/tools/testing/selftests/net/test_vxlan_fdb_changelink.sh
+++ b/tools/testing/selftests/net/test_vxlan_fdb_changelink.sh
@@ -3,6 +3,7 @@
 
 ALL_TESTS="
        test_set_remote
+       test_change_mc_remote
 "
 source lib.sh
 
@@ -31,6 +32,81 @@ test_set_remote()
        log_test 'FDB default-remote handling across "ip link set"'
 }
 
+fmt_remote()
+{
+       local addr=$1; shift
+
+       if [[ $addr == 224.* ]]; then
+               echo "group $addr"
+       else
+               echo "remote $addr"
+       fi
+}
+
+change_remote()
+{
+       local remote=$1; shift
+
+       ip link set dev vx type vxlan $(fmt_remote $remote) dev v1
+}
+
+check_membership()
+{
+       local check_vec=("$@")
+
+       local memberships
+       memberships=$(
+           netstat -n --groups |
+               sed -n '/^v1\b/p' |
+               grep -o '[^ ]*$'
+       )
+       check_err $? "Couldn't obtain group memberships"
+
+       local item
+       for item in "${check_vec[@]}"; do
+               eval "local $item"
+               echo "$memberships" | grep -q "\b$group\b"
+               check_err_fail $fail $? "$group is_ex reported in IGMP query response"
+       done
+}
+
+test_change_mc_remote()
+{
+       check_command netstat || return
+
+       ip_link_add v1 up type veth peer name v2
+       ip_link_set_up v2
+
+       RET=0
+
+       ip_link_add vx up type vxlan dstport 4789 \
+               local 192.0.2.1 $(fmt_remote 224.1.1.1) dev v1 vni 1000
+
+       check_membership "group=224.1.1.1 fail=0" \
+                        "group=224.1.1.2 fail=1" \
+                        "group=224.1.1.3 fail=1"
+
+       log_test "MC group report after VXLAN creation"
+
+       RET=0
+
+       change_remote 224.1.1.2
+       check_membership "group=224.1.1.1 fail=1" \
+                        "group=224.1.1.2 fail=0" \
+                        "group=224.1.1.3 fail=1"
+
+       log_test "MC group report after changing VXLAN remote MC->MC"
+
+       RET=0
+
+       change_remote 192.0.2.2
+       check_membership "group=224.1.1.1 fail=1" \
+                        "group=224.1.1.2 fail=1" \
+                        "group=224.1.1.3 fail=1"
+
+       log_test "MC group report after changing VXLAN remote MC->UC"
+}
+
 trap defer_scopes_cleanup EXIT
 
 tests_run