Add 'ip neigh' to ip_lib

This change adds 'ip neigh add' and 'ip neigh delete' as
Ip Device commands

Partially-Implements: blueprint neutron-ovs-dvr
Change-Id: I59428e2fe28c6a632c232b47cc46c097c281f253

neutron/agent/linux/ip_lib.py

@@ -192,6 +192,7 @@ class IPDevice(SubProcessBase):
         self.link = IpLinkCommand(self)
         self.addr = IpAddrCommand(self)
         self.route = IpRouteCommand(self)
+        self.neigh = IpNeighCommand(self)
 
     def __eq__(self, other):
         return (other is not None and self.name == other.name
@@ -439,6 +440,30 @@ class IpRouteCommand(IpDeviceCommandBase):
                                   'dev', device)
 
 
+class IpNeighCommand(IpDeviceCommandBase):
+    COMMAND = 'neigh'
+
+    def add(self, ip_version, ip_address, mac_address):
+        self._as_root('add',
+                      ip_address,
+                      'lladdr',
+                      mac_address,
+                      'nud',
+                      'permanent',
+                      'dev',
+                      self.name,
+                      options=[ip_version])
+
+    def delete(self, ip_version, ip_address, mac_address):
+        self._as_root('del',
+                      ip_address,
+                      'lladdr',
+                      mac_address,
+                      'dev',
+                      self.name,
+                      options=[ip_version])
+
+
 class IpNetnsCommand(IpCommandBase):
     COMMAND = 'netns'
 

neutron/tests/unit/test_linux_ip_lib.py

@@ -799,3 +799,22 @@ class TestDeviceExists(base.BaseTestCase):
             # device doesn't exists
             ip_lib_mock.link.set_up.side_effect = RuntimeError
             self.assertFalse(ip_lib.ensure_device_is_ready("eth0"))
+
+
+class TestIpNeighCommand(TestIPCmdBase):
+    def setUp(self):
+        super(TestIpNeighCommand, self).setUp()
+        self.parent.name = 'tap0'
+        self.command = 'neigh'
+        self.neigh_cmd = ip_lib.IpNeighCommand(self.parent)
+
+    def test_add_entry(self):
+        self.neigh_cmd.add(4, '192.168.45.100', 'cc:dd:ee:ff:ab:cd')
+        self._assert_sudo([4], ('add', '192.168.45.100', 'lladdr',
+                                'cc:dd:ee:ff:ab:cd', 'nud', 'permanent',
+                                'dev', 'tap0'))
+
+    def test_delete_entry(self):
+        self.neigh_cmd.delete(4, '192.168.45.100', 'cc:dd:ee:ff:ab:cd')
+        self._assert_sudo([4], ('del', '192.168.45.100', 'lladdr',
+                                'cc:dd:ee:ff:ab:cd', 'dev', 'tap0'))