diff --git a/neutron_lib/api/definitions/__init__.py b/neutron_lib/api/definitions/__init__.py
index f96759fba..9c9679b1d 100644
--- a/neutron_lib/api/definitions/__init__.py
+++ b/neutron_lib/api/definitions/__init__.py
@@ -72,6 +72,7 @@ from neutron_lib.api.definitions import revisionifmatch
 from neutron_lib.api.definitions import router_availability_zone
 from neutron_lib.api.definitions import router_interface_fip
 from neutron_lib.api.definitions import routerservicetype
+from neutron_lib.api.definitions import security_groups_port_filtering
 from neutron_lib.api.definitions import segment
 from neutron_lib.api.definitions import servicetype
 from neutron_lib.api.definitions import sfc
@@ -153,6 +154,7 @@ _ALL_API_DEFINITIONS = {
     router_availability_zone,
     router_interface_fip,
     routerservicetype,
+    security_groups_port_filtering,
     segment,
     servicetype,
     sfc,
diff --git a/neutron_lib/api/definitions/security_groups_port_filtering.py b/neutron_lib/api/definitions/security_groups_port_filtering.py
new file mode 100644
index 000000000..9a200b630
--- /dev/null
+++ b/neutron_lib/api/definitions/security_groups_port_filtering.py
@@ -0,0 +1,59 @@
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+# The alias of the extension.
+ALIAS = 'port-security-groups-filtering'
+
+# Whether or not this extension is simply signaling behavior to the user
+# or it actively modifies the attribute map.
+IS_SHIM_EXTENSION = True
+
+# Whether the extension is marking the adoption of standardattr model for
+# legacy resources, or introducing new standardattr attributes. False or
+# None if the standardattr model is adopted since the introduction of
+# resource extension.
+# If this is True, the alias for the extension should be prefixed with
+# 'standard-attr-'.
+IS_STANDARD_ATTR_EXTENSION = False
+
+# The name of the extension.
+NAME = 'Port filtering on security groups'
+
+# The description of the extension.
+DESCRIPTION = "Provides security groups filtering when listing ports"
+
+# A timestamp of when the extension was introduced.
+UPDATED_TIMESTAMP = "2018-01-09T09:00:00-00:00"
+
+# The resource attribute map for the extension.
+RESOURCE_ATTRIBUTE_MAP = {
+}
+
+# The subresource attribute map for the extension.
+SUB_RESOURCE_ATTRIBUTE_MAP = {
+}
+
+# The action map.
+ACTION_MAP = {
+}
+
+# The action status.
+ACTION_STATUS = {
+}
+
+# The list of required extensions.
+REQUIRED_EXTENSIONS = [
+]
+
+# The list of optional extensions.
+OPTIONAL_EXTENSIONS = [
+]
diff --git a/neutron_lib/tests/unit/api/definitions/test_security_groups_port_filtering.py b/neutron_lib/tests/unit/api/definitions/test_security_groups_port_filtering.py
new file mode 100644
index 000000000..fbb60eac2
--- /dev/null
+++ b/neutron_lib/tests/unit/api/definitions/test_security_groups_port_filtering.py
@@ -0,0 +1,20 @@
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from neutron_lib.api.definitions import security_groups_port_filtering
+from neutron_lib.tests.unit.api.definitions import base
+
+
+class SecurityGroupsPortFilteringDefinitionTestCase(
+        base.DefinitionBaseTestCase):
+
+    extension_module = security_groups_port_filtering
diff --git a/releasenotes/notes/rehome-secgrp-portfilter-apidef-6723062419531d70.yaml b/releasenotes/notes/rehome-secgrp-portfilter-apidef-6723062419531d70.yaml
new file mode 100644
index 000000000..f8df78cba
--- /dev/null
+++ b/releasenotes/notes/rehome-secgrp-portfilter-apidef-6723062419531d70.yaml
@@ -0,0 +1,5 @@
+---
+features:
+  - The API defintion for the ``port-security-groups-filtering`` extension is
+    now available in
+    ``neutron_lib.api.definitions.security_groups_port_filtering``.