T6630: ntp: add chrony "ntp over ptp" transport

data/templates/chrony/chrony.conf.j2

@@ -42,7 +42,7 @@ user {{ user }}
 {%         if config.pool is vyos_defined %}
 {%             set association = 'pool' %}
 {%         endif %}
-{{ association }} {{ server | replace('_', '-') }} iburst {{- ' nts' if config.nts is vyos_defined }} {{- ' noselect' if config.noselect is vyos_defined }} {{- ' prefer' if config.prefer is vyos_defined }} {{- ' xleave' if config.interleave is vyos_defined }}
+{{ association }} {{ server | replace('_', '-') }} iburst {{- ' nts' if config.nts is vyos_defined }} {{- ' noselect' if config.noselect is vyos_defined }} {{- ' prefer' if config.prefer is vyos_defined }} {{- ' xleave' if config.interleave is vyos_defined }} {{- ' port 319' if config.ptp_transport is vyos_defined }}
 {%     endfor %}
 {% endif %}
 
@@ -77,3 +77,8 @@ hwtimestamp {{ interface }} {{- ' rxfilter ' ~ config.receive_filter if config.r
 # Enable hardware timestamping on all supported interfaces not otherwise configured
 hwtimestamp *
 {% endif %}
+
+{% if ptp_transport is vyos_defined %}
+# Enable sending and receiving NTP over PTP packets (PTP transport)
+ptpport 319
+{% endif %}

interface-definitions/service_ntp.xml.in

@@ -48,7 +48,7 @@
                         <properties>
                           <help>Selects which inbound packets are timestamped by the NIC</help>
                           <completionHelp>
-                            <list>all ntp none</list>
+                            <list>all ntp ptp none</list>
                           </completionHelp>
                           <valueHelp>
                             <format>all</format>
@@ -58,12 +58,16 @@
                             <format>ntp</format>
                             <description>Only NTP packets are timestamped</description>
                           </valueHelp>
+                          <valueHelp>
+                            <format>ptp</format>
+                            <description>Only PTP packets, or NTP packets using the PTP transport, are timestamped</description>
+                          </valueHelp>
                           <valueHelp>
                             <format>none</format>
                             <description>No received packets are timestamped</description>
                           </valueHelp>
                           <constraint>
-                            <regex>(all|ntp|none)</regex>
+                            <regex>(all|ntp|ptp|none)</regex>
                           </constraint>
                         </properties>
                       </leafNode>
@@ -73,6 +77,12 @@
               </node>
             </children>
           </node>
+          <leafNode name="ptp-transport">
+            <properties>
+              <help>Enables the PTP transport for NTP packets</help>
+              <valueless/>
+            </properties>
+          </leafNode>
           <leafNode name="leap-second">
             <properties>
               <help>Leap second behavior</help>
@@ -146,6 +156,12 @@
                   <valueless/>
                 </properties>
               </leafNode>
+              <leafNode name="ptp-transport">
+                <properties>
+                  <help>Use the PTP transport for the server</help>
+                  <valueless/>
+                </properties>
+              </leafNode>
               <leafNode name="interleave">
                 <properties>
                   <help>Use the interleaved mode for the server</help>

smoketest/scripts/cli/test_service_ntp.py

@@ -224,5 +224,39 @@ def test_offload_timestamp_default(self):
 
         self.assertIn('hwtimestamp *', config)
 
+    def test_ptp_transport(self):
+        # Test offloading of NIC timestamp
+        servers = ['192.0.2.1', '192.0.2.2']
+        options = ['prefer']
+
+        for server in servers:
+            for option in options:
+                self.cli_set(base_path + ['server', server, option])
+            self.cli_set(base_path + ['server', server, 'ptp-transport'])
+
+        # commit changes (expected to fail)
+        with self.assertRaises(ConfigSessionError):
+            self.cli_commit()
+
+        # add the required top-level option and commit
+        self.cli_set(base_path + ['ptp-transport'])
+        self.cli_commit()
+
+        # Check generated configuration
+        # this file must be read with higher permissions
+        config = cmd(f'sudo cat {NTP_CONF}')
+        self.assertIn('driftfile /run/chrony/drift', config)
+        self.assertIn('dumpdir /run/chrony', config)
+        self.assertIn('ntsdumpdir /run/chrony', config)
+        self.assertIn('clientloglimit 1048576', config)
+        self.assertIn('rtcsync', config)
+        self.assertIn('makestep 1.0 3', config)
+        self.assertIn('leapsectz right/UTC', config)
+
+        for server in servers:
+            self.assertIn(f'server {server} iburst ' + ' '.join(options) + ' port 319', config)
+
+        self.assertIn('ptpport 319', config)
+
 if __name__ == '__main__':
     unittest.main(verbosity=2)

src/conf_mode/service_ntp.py

@@ -87,6 +87,15 @@ def verify(ntp):
         if ipv6_addresses > 1:
             raise ConfigError(f'NTP Only admits one ipv6 value for listen-address parameter ')
 
+    if 'server' in ntp:
+        for host, server in ntp['server'].items():
+            if 'ptp_transport' in server:
+                if 'ptp_transport' not in ntp:
+                    raise ConfigError('ptp-transport must be enabled on the service '\
+                                      f'before it can be used with server {host}')
+                else:
+                    break
+
     return None
 
 def generate(ntp):