relay role implementation

test/fuzz/fuzz-network-parser/directives.network

@@ -352,6 +352,7 @@ DNS=
 SendOption=
 SendVendorOption=
 BindToInterface=
+RelayTarget=
 [NextHop]
 Id=
 Gateway=

test/test-network/conf/agent-client-peer.network

@@ -0,0 +1,9 @@
+[Match]
+Name=client-peer
+[Network]
+Address=192.168.6.2/24
+DHCPServer=yes
+IPForward=ipv4
+[DHCPServer]
+RelayTarget=192.168.5.1
+BindToInterface=no

test/test-network/conf/agent-client.network

@@ -0,0 +1,5 @@
+[Match]
+Name=client
+[Network]
+DHCP=yes
+IPForward=ipv4

test/test-network/conf/agent-server-peer.network

@@ -0,0 +1,5 @@
+[Match]
+Name=server-peer
+[Network]
+Address=192.168.5.2/24
+IPForward=ipv4

test/test-network/conf/agent-server.network

@@ -0,0 +1,10 @@
+[Match]
+Name=server
+[Network]
+Address=192.168.5.1/24
+IPForward=ipv4
+DHCPServer=yes
+[DHCPServer]
+BindToInterface=no
+PoolOffset=150
+PoolSize=1

test/test-network/conf/agent-veth-client.netdev

@@ -0,0 +1,8 @@
+[NetDev]
+Name=client
+Kind=veth
+MACAddress=12:34:56:78:9a:bc
+
+[Peer]
+Name=client-peer
+MACAddress=12:34:56:78:9a:bd

test/test-network/conf/agent-veth-server.netdev

@@ -0,0 +1,8 @@
+[NetDev]
+Name=server
+Kind=veth
+MACAddress=12:34:56:78:9b:bc
+
+[Peer]
+Name=server-peer
+MACAddress=12:34:56:78:9b:bd

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

@@ -3689,6 +3689,43 @@ class NetworkdDHCPServerTests(unittest.TestCase, Utilities):
         self.assertRegex(output, '192.168.5.*')
         self.assertRegex(output, 'Europe/Berlin')
 
+class NetworkdDHCPServerRelayAgentTests(unittest.TestCase, Utilities):
+    links = [
+        'client',
+        'server',
+        'client-peer',
+        'server-peer',
+        ]
+
+    units = [
+        'agent-veth-client.netdev',
+        'agent-veth-server.netdev',
+        'agent-client.network',
+        'agent-server.network',
+        'agent-client-peer.network',
+        'agent-server-peer.network',
+        ]
+
+    def setUp(self):
+        remove_links(self.links)
+        stop_networkd(show_logs=False)
+
+    def tearDown(self):
+        remove_links(self.links)
+        remove_unit_from_networkd_path(self.units)
+        stop_networkd(show_logs=True)
+
+    def test_relay_agent(self):
+        copy_unit_to_networkd_unit_path(*self.units)
+        start_networkd()
+
+        #Test is disabled until BindToInterface DHCP server configuration option is supported
+        self.wait_online(['client:routable'])
+
+        output = check_output(*networkctl_cmd, '-n', '0', 'status', 'client', env=env)
+        print(output)
+        self.assertRegex(output, 'Address: 192.168.5.150 \(DHCP4 via 192.168.5.1\)')
+
 class NetworkdDHCPClientTests(unittest.TestCase, Utilities):
     links = [
         'veth99',