[lldp]: Add verification IPv4 address on LLDP conf Jinja2 Template (#5699)

Fix #5812

LLDP conf Jinja2 Template does not verify IPv4 address and can use IPv6 version. This issue does not effect control LLDP daemon. Issue can be reproduced via `test_snmp_lldp` test. LLDP conf Jinja2 Template selects first item from the list of mgmt interfaces.

TESTBED_1 LLDP conf

```
# cat /etc/lldpd.conf 
configure ports eth0 lldp portidsubtype local eth0
configure system ip management pattern FC00:3::32
configure system hostname dut-1
```
TESTBED_2  LLDP conf

```
# cat /etc/lldpd.conf
configure ports eth0 lldp portidsubtype local eth0
configure system ip management pattern 10.22.24.61
configure system hostname dut-2
```
TESTBED_1  MGMT_INTERFACE

```
$ redis-cli -n 4 keys "*" | grep MGMT_INTERFACE
MGMT_INTERFACE|eth0|10.22.24.53/23
MGMT_INTERFACE|eth0|FC00:3::32/64
```
TESTBED_2  MGMT_INTERFACE

```
$ redis-cli -n 4 keys "*" | grep MGMT_INTERFACE
MGMT_INTERFACE|eth0|FC00:3::32/64
MGMT_INTERFACE|eth0|10.22.24.61/23

```

Signed-off-by: Petro Bratash <petrox.bratash@intel.com>

dockers/docker-lldp/lldpd.conf.j2

@@ -1,13 +1,20 @@
+{% set mgmt_if = {} %}
 {% if MGMT_INTERFACE %}
-{# If MGMT port alias is available, use it for port ID subtype, otherwise use port name #}
-{% set mgmt_port_name = (MGMT_INTERFACE.keys()|list)[0][0] %}
-{% set ipv4 = (MGMT_INTERFACE.keys()|list)[0][1].split('/')[0] %}
-{% if MGMT_PORT and MGMT_PORT[mgmt_port_name] and MGMT_PORT[mgmt_port_name].alias %}
-configure ports eth0 lldp portidsubtype local {{ MGMT_PORT[mgmt_port_name].alias }}
-{% else %}
-configure ports eth0 lldp portidsubtype local {{ mgmt_port_name }}
+{% for (mgmt_name, mgmt_prefix) in MGMT_INTERFACE|pfx_filter %}
+{% if mgmt_prefix|ipv4 %}
+{% if mgmt_if.update({'port_name' : mgmt_name}) %} {% endif %}
+{% if mgmt_if.update({'ipv4' : mgmt_prefix|ip}) %} {% endif %}
 {% endif %}
-configure system ip management pattern {{ ipv4 }}
+{% endfor %}
+{% endif %}
+{% if mgmt_if %}
+{# If MGMT port alias is available, use it for port ID subtype, otherwise use port name #}
+{% if MGMT_PORT and MGMT_PORT[mgmt_if.port_name] and MGMT_PORT[mgmt_if.port_name].alias %}
+configure ports eth0 lldp portidsubtype local {{ MGMT_PORT[mgmt_if.port_name].alias }}
+{% else %}
+configure ports eth0 lldp portidsubtype local {{ mgmt_if.port_name }}
+{% endif %}
+configure system ip management pattern {{ mgmt_if.ipv4 }}
 {% endif %}
 configure system hostname {{ DEVICE_METADATA['localhost']['hostname'] }}
 {# pause lldpd operations until all interfaces are well configured, resume command will run in lldpmgrd #}

src/sonic-config-engine/tests/data/lldp/mgmt_iface_ipv4.json

@@ -0,0 +1,12 @@
+{
+    "DEVICE_METADATA": {
+        "localhost": {
+            "hostname": "switch-t0"
+        }
+    },
+    "MGMT_INTERFACE": {
+        "eth0|10.0.0.100/24": {
+            "gwaddr": "10.0.0.100"
+        }
+    }
+}

src/sonic-config-engine/tests/data/lldp/mgmt_iface_ipv4_and_ipv6.json

@@ -0,0 +1,15 @@
+{
+    "DEVICE_METADATA": {
+        "localhost": {
+            "hostname": "switch-t0"
+        }
+    },
+    "MGMT_INTERFACE": {
+        "eth0|10.0.0.100/24": {
+            "gwaddr": "10.0.0.100"
+        },
+        "eth0|2603:10e2:0:2902::8/64": {
+            "gwaddr": "2603:10e2:0:2902::8"
+        }
+    }
+}

src/sonic-config-engine/tests/data/lldp/mgmt_iface_ipv6.json

@@ -0,0 +1,12 @@
+{
+    "DEVICE_METADATA": {
+        "localhost": {
+            "hostname": "switch-t0"
+        }
+    },
+    "MGMT_INTERFACE": {
+        "eth0|2603:10e2:0:2902::8/64": {
+            "gwaddr": "2603:10e2:0:2902::8"
+        }
+    }
+}

src/sonic-config-engine/tests/sample_output/py2/lldp_conf/lldpd-ipv6-iface.conf

@@ -0,0 +1,2 @@
+configure system hostname switch-t0
+pause

src/sonic-config-engine/tests/sample_output/py3/lldp_conf/lldpd-ipv6-iface.conf

@@ -0,0 +1,2 @@
+configure system hostname switch-t0
+pause

src/sonic-config-engine/tests/test_j2files.py

@@ -68,9 +68,28 @@ class TestJ2Files(TestCase):
 
     def test_lldp(self):
         lldpd_conf_template = os.path.join(self.test_dir, '..', '..', '..', 'dockers', 'docker-lldp', 'lldpd.conf.j2')
-        argument = '-m ' + self.t0_minigraph + ' -p ' + self.t0_port_config + ' -t ' + lldpd_conf_template + ' > ' + self.output_file
+
+        expected_mgmt_ipv4 = os.path.join(self.test_dir, 'sample_output', utils.PYvX_DIR, 'lldp_conf', 'lldpd-ipv4-iface.conf')
+        expected_mgmt_ipv6 = os.path.join(self.test_dir, 'sample_output', utils.PYvX_DIR, 'lldp_conf', 'lldpd-ipv6-iface.conf')
+        expected_mgmt_ipv4_and_ipv6 = expected_mgmt_ipv4
+
+        # Test generation of lldpd.conf if IPv4 and IPv6 management interfaces exist
+        mgmt_iface_ipv4_and_ipv6_json = os.path.join(self.test_dir, "data", "lldp", "mgmt_iface_ipv4_and_ipv6.json")
+        argument = '-j {} -t {} > {}'.format(mgmt_iface_ipv4_and_ipv6_json, lldpd_conf_template, self.output_file)
         self.run_script(argument)
-        self.assertTrue(filecmp.cmp(os.path.join(self.test_dir, 'sample_output', utils.PYvX_DIR, 'lldpd.conf'), self.output_file))
+        self.assertTrue(filecmp.cmp(expected_mgmt_ipv4_and_ipv6, self.output_file))
+
+        # Test generation of lldpd.conf if management interface IPv4 only exist
+        mgmt_iface_ipv4_json = os.path.join(self.test_dir, "data", "lldp", "mgmt_iface_ipv4.json")
+        argument = '-j {} -t {} > {}'.format(mgmt_iface_ipv4_json, lldpd_conf_template, self.output_file)
+        self.run_script(argument)
+        self.assertTrue(filecmp.cmp(expected_mgmt_ipv4, self.output_file))
+
+        # Test generation of lldpd.conf if Management interface IPv6 only exist
+        mgmt_iface_ipv6_json = os.path.join(self.test_dir, "data", "lldp", "mgmt_iface_ipv6.json")
+        argument = '-j {} -t {} > {}'.format(mgmt_iface_ipv6_json, lldpd_conf_template, self.output_file)
+        self.run_script(argument)
+        self.assertTrue(filecmp.cmp(expected_mgmt_ipv6, self.output_file))
 
     def test_bgpd_quagga(self):
         conf_template = os.path.join(self.test_dir, '..', '..', '..', 'dockers', 'docker-fpm-quagga', 'bgpd.conf.j2')