feat: Add network router interface tools

src/openstack_mcp_server/tools/network_tools.py

@@ -10,6 +10,7 @@
     Network,
     Port,
     Router,
+    RouterInterface,
     Subnet,
 )
 
@@ -52,6 +53,9 @@ def register_tools(self, mcp: FastMCP):
         mcp.tool()(self.get_router_detail)
         mcp.tool()(self.update_router)
         mcp.tool()(self.delete_router)
+        mcp.tool()(self.add_router_interface)
+        mcp.tool()(self.get_router_interfaces)
+        mcp.tool()(self.remove_router_interface)
 
     def get_networks(
         self,
@@ -1038,6 +1042,93 @@ def delete_router(self, router_id: str) -> None:
         conn.network.delete_router(router_id, ignore_missing=False)
         return None
 
+    def add_router_interface(
+        self,
+        router_id: str,
+        subnet_id: str | None = None,
+        port_id: str | None = None,
+    ) -> RouterInterface:
+        """
+        Add an interface to a Router by subnet or port.
+        Provide either subnet_id or port_id.
+
+        :param router_id: Target router ID
+        :param subnet_id: Subnet ID to attach (mutually exclusive with port_id)
+        :param port_id: Port ID to attach (mutually exclusive with subnet_id)
+        :return: Created/attached router interface information as RouterInterface
+        """
+        conn = get_openstack_conn()
+        args: dict = {}
+        if subnet_id is not None:
+            args["subnet_id"] = subnet_id
+        if port_id is not None:
+            args["port_id"] = port_id
+        res = conn.network.add_interface_to_router(router_id, **args)
+        return RouterInterface(
+            router_id=res.get("router_id", router_id),
+            port_id=res.get("port_id"),
+            subnet_id=res.get("subnet_id"),
+        )
+
+    def get_router_interfaces(self, router_id: str) -> list[RouterInterface]:
+        """
+        List interfaces attached to a Router.
+
+        :param router_id: Target router ID
+        :return: List of RouterInterface objects representing router-owned ports
+        """
+        conn = get_openstack_conn()
+        filters = {
+            "device_id": router_id,
+            "device_owner": "network:router_interface",
+        }
+        ports = conn.network.ports(**filters)
+        result: list[RouterInterface] = []
+        for p in ports:
+            subnet_id = None
+            if getattr(p, "fixed_ips", None):
+                first = p.fixed_ips[0]
+                if isinstance(first, dict):
+                    subnet_id = first.get("subnet_id")
+                else:
+                    subnet_id = None
+            result.append(
+                RouterInterface(
+                    router_id=router_id,
+                    port_id=p.id,
+                    subnet_id=subnet_id,
+                )
+            )
+        return result
+
+    def remove_router_interface(
+        self,
+        router_id: str,
+        subnet_id: str | None = None,
+        port_id: str | None = None,
+    ) -> RouterInterface:
+        """
+        Remove an interface from a Router by subnet or port.
+        Provide either subnet_id or port_id.
+
+        :param router_id: Target router ID
+        :param subnet_id: Subnet ID to detach (mutually exclusive with port_id)
+        :param port_id: Port ID to detach (mutually exclusive with subnet_id)
+        :return: Detached interface information as RouterInterface
+        """
+        conn = get_openstack_conn()
+        args: dict = {}
+        if subnet_id is not None:
+            args["subnet_id"] = subnet_id
+        if port_id is not None:
+            args["port_id"] = port_id
+        res = conn.network.remove_interface_from_router(router_id, **args)
+        return RouterInterface(
+            router_id=res.get("router_id", router_id),
+            port_id=res.get("port_id"),
+            subnet_id=res.get("subnet_id"),
+        )
+
     def _convert_to_router_model(self, openstack_router) -> Router:
         """
         Convert an OpenStack Router object to a Router pydantic model.

src/openstack_mcp_server/tools/response/network.py

@@ -59,6 +59,12 @@ class Router(BaseModel):
     routes: list[dict] | None = None
 
 
+class RouterInterface(BaseModel):
+    router_id: str
+    port_id: str
+    subnet_id: str | None = None
+
+
 class SecurityGroup(BaseModel):
     id: str
     name: str | None = None

tests/tools/test_network_tools.py

@@ -10,6 +10,7 @@
     Network,
     Port,
     Router,
+    RouterInterface,
     Subnet,
 )
 
@@ -1569,3 +1570,67 @@ def test_delete_router_success(self, mock_openstack_connect_network):
             "router-6",
             ignore_missing=False,
         )
+
+    def test_add_get_remove_router_interface_by_subnet(
+        self, mock_openstack_connect_network
+    ):
+        mock_conn = mock_openstack_connect_network
+
+        add_res = {"router_id": "r-if-1", "port_id": "p-1", "subnet_id": "s-1"}
+        mock_conn.network.add_interface_to_router.return_value = add_res
+
+        p = Mock()
+        p.id = "p-1"
+        p.fixed_ips = [{"subnet_id": "s-1", "ip_address": "10.0.0.1"}]
+        mock_conn.network.ports.return_value = [p]
+
+        rm_res = {"router_id": "r-if-1", "port_id": "p-1", "subnet_id": "s-1"}
+        mock_conn.network.remove_interface_from_router.return_value = rm_res
+
+        tools = self.get_network_tools()
+        added = tools.add_router_interface("r-if-1", subnet_id="s-1")
+        assert added == RouterInterface(
+            router_id="r-if-1", port_id="p-1", subnet_id="s-1"
+        )
+
+        lst = tools.get_router_interfaces("r-if-1")
+        assert lst == [
+            RouterInterface(router_id="r-if-1", port_id="p-1", subnet_id="s-1")
+        ]
+
+        removed = tools.remove_router_interface("r-if-1", subnet_id="s-1")
+        assert removed == RouterInterface(
+            router_id="r-if-1", port_id="p-1", subnet_id="s-1"
+        )
+
+    def test_add_get_remove_router_interface_by_port(
+        self, mock_openstack_connect_network
+    ):
+        mock_conn = mock_openstack_connect_network
+
+        add_res = {"router_id": "r-if-2", "port_id": "p-2", "subnet_id": "s-2"}
+        mock_conn.network.add_interface_to_router.return_value = add_res
+
+        p = Mock()
+        p.id = "p-2"
+        p.fixed_ips = [{"subnet_id": "s-2", "ip_address": "10.0.1.1"}]
+        mock_conn.network.ports.return_value = [p]
+
+        rm_res = {"router_id": "r-if-2", "port_id": "p-2", "subnet_id": "s-2"}
+        mock_conn.network.remove_interface_from_router.return_value = rm_res
+
+        tools = self.get_network_tools()
+        added = tools.add_router_interface("r-if-2", port_id="p-2")
+        assert added == RouterInterface(
+            router_id="r-if-2", port_id="p-2", subnet_id="s-2"
+        )
+
+        lst = tools.get_router_interfaces("r-if-2")
+        assert lst == [
+            RouterInterface(router_id="r-if-2", port_id="p-2", subnet_id="s-2")
+        ]
+
+        removed = tools.remove_router_interface("r-if-2", port_id="p-2")
+        assert removed == RouterInterface(
+            router_id="r-if-2", port_id="p-2", subnet_id="s-2"
+        )