test-network: set xfrm interface ID

This also unifies two tests for xfrm, and checks the output of
'ip link' command.

Fixes #22329.

(cherry picked from commit 020483b248)

test/test-network/conf/25-xfrm-independent.netdev

@@ -4,4 +4,5 @@ Kind=xfrm
 Name=xfrm99
 
 [Xfrm]
+InterfaceId=0x99
 Independent=yes

test/test-network/conf/25-xfrm.netdev

@@ -1,4 +1,7 @@
 # SPDX-License-Identifier: LGPL-2.1-or-later
 [NetDev]
 Kind=xfrm
-Name=xfrm99
+Name=xfrm98
+
+[Xfrm]
+InterfaceId=0x98

test/test-network/conf/netdev-link-local-addressing-yes.network

@@ -18,7 +18,7 @@ Name=geneve99
 Name=ifb99
 Name=ipiptun99
 Name=nlmon99
-Name=xfrm99
+Name=xfrm98 xfrm99
 Name=vxlan98
 Name=hogehogehogehogehogehoge
 

test/test-network/conf/xfrm.network

@@ -4,4 +4,4 @@ Name=dummy98
 
 [Network]
 IPv6AcceptRA=no
-Xfrm=xfrm99
+Xfrm=xfrm98

test/test-network/systemd-networkd-tests.py

@@ -871,6 +871,7 @@ class NetworkctlTests(unittest.TestCase, Utilities):
 class NetworkdNetDevTests(unittest.TestCase, Utilities):
 
     links_remove_earlier = [
+        'xfrm98',
         'xfrm99',
     ]
 
@@ -1759,20 +1760,21 @@ class NetworkdNetDevTests(unittest.TestCase, Utilities):
     @expectedFailureIfModuleIsNotAvailable('xfrm_interface')
     def test_xfrm(self):
         copy_unit_to_networkd_unit_path('12-dummy.netdev', 'xfrm.network',
-                                        '25-xfrm.netdev', 'netdev-link-local-addressing-yes.network')
+                                        '25-xfrm.netdev', '25-xfrm-independent.netdev',
+                                        'netdev-link-local-addressing-yes.network')
         start_networkd()
 
-        self.wait_online(['xfrm99:degraded', 'dummy98:degraded'])
+        self.wait_online(['dummy98:degraded', 'xfrm98:degraded', 'xfrm99:degraded'])
 
-        output = check_output('ip link show dev xfrm99')
+        output = check_output('ip -d link show dev xfrm98')
         print(output)
+        self.assertIn('xfrm98@dummy98:', output)
+        self.assertIn('xfrm if_id 0x98 ', output)
 
-    @expectedFailureIfModuleIsNotAvailable('xfrm_interface')
+        output = check_output('ip -d link show dev xfrm99')
-    def test_xfrm_independent(self):
+        print(output)
-        copy_unit_to_networkd_unit_path('25-xfrm-independent.netdev', 'netdev-link-local-addressing-yes.network')
+        self.assertIn('xfrm99@lo:', output)
-        start_networkd()
+        self.assertIn('xfrm if_id 0x99 ', output)
-
-        self.wait_online(['xfrm99:degraded'])
 
     @expectedFailureIfModuleIsNotAvailable('fou')
     def test_fou(self):