smoketest: T6592: verify no interface stalls in conntrack ct_iface_map on deletionmergify/bp/circinus/pr-3857

Now that interfaces are deleted from ct_iface_map during deletion it's time to
also add a smoketest ensuring there is no entry in the ct_iface_map once an
interface was deleted from the CLI.

(cherry picked from commit 1c42ee9d16dd49fff2cbde652bf24a38f364526c)

2 files changed, 35 insertions, 3 deletions

diff --git a/python/vyos/utils/network.py b/python/vyos/utils/network.py
index 8406a5638..8fce08de0 100644
--- a/python/vyos/utils/network.py
+++ b/python/vyos/utils/network.py
@@ -569,3 +569,31 @@ def ipv6_prefix_length(low, high):
             return plen + i + 1
 
     return None
+
+def get_nft_vrf_zone_mapping() -> dict:
+    """
+    Retrieve current nftables conntrack mapping list from Kernel
+
+    returns: [{'interface': 'red', 'vrf_tableid': 1000},
+              {'interface': 'eth2', 'vrf_tableid': 1000},
+              {'interface': 'blue', 'vrf_tableid': 2000}]
+    """
+    from json import loads
+    from jmespath import search
+    from vyos.utils.process import cmd
+    output = []
+    tmp = loads(cmd('sudo nft -j list table inet vrf_zones'))
+    # {'nftables': [{'metainfo': {'json_schema_version': 1,
+    #                     'release_name': 'Old Doc Yak #3',
+    #                     'version': '1.0.9'}},
+    #       {'table': {'family': 'inet', 'handle': 6, 'name': 'vrf_zones'}},
+    #       {'map': {'elem': [['eth0', 666],
+    #                         ['dum0', 666],
+    #                         ['wg500', 666],
+    #                         ['bond10.666', 666]],
+    vrf_list = search('nftables[].map.elem | [0]', tmp)
+    if not vrf_list:
+        return output
+    for (vrf_name, vrf_id) in vrf_list:
+        output.append({'interface' : vrf_name, 'vrf_tableid' : vrf_id})
+    return output
diff --git a/smoketest/scripts/cli/base_interfaces_test.py b/smoketest/scripts/cli/base_interfaces_test.py
index 4072fd5c2..012bd0524 100644
--- a/smoketest/scripts/cli/base_interfaces_test.py
+++ b/smoketest/scripts/cli/base_interfaces_test.py
@@ -15,7 +15,6 @@
 from netifaces import AF_INET
 from netifaces import AF_INET6
 from netifaces import ifaddresses
-from netifaces import interfaces
 
 from base_vyostest_shim import VyOSUnitTestSHIM
 
@@ -25,13 +24,15 @@ from vyos.ifconfig import Interface
 from vyos.ifconfig import Section
 from vyos.utils.file import read_file
 from vyos.utils.dict import dict_search
+from vyos.utils.process import cmd
 from vyos.utils.process import process_named_running
 from vyos.utils.network import get_interface_config
 from vyos.utils.network import get_interface_vrf
 from vyos.utils.network import get_vrf_tableid
-from vyos.utils.process import cmd
+from vyos.utils.network import interface_exists
 from vyos.utils.network import is_intf_addr_assigned
 from vyos.utils.network import is_ipv6_link_local
+from vyos.utils.network import get_nft_vrf_zone_mapping
 from vyos.xml_ref import cli_defined
 
 dhclient_base_dir = directories['isc_dhclient_dir']
@@ -117,8 +118,11 @@ class BasicInterfaceTest:
             self.cli_commit()
 
             # Verify that no previously interface remained on the system
+            ct_map = get_nft_vrf_zone_mapping()
             for intf in self._interfaces:
-                self.assertNotIn(intf, interfaces())
+                self.assertFalse(interface_exists(intf))
+                for map_entry in ct_map:
+                     self.assertNotEqual(intf, map_entry['interface'])
 
             # No daemon started during tests should remain running
             for daemon in ['dhcp6c', 'dhclient']: