OVN: Add support for DHCP option "domain-search" for IPv4

Nothing much else, what the title says...

Change-Id: Ib1d41a6e4c869e108f31c1eb604f22c794d66467
Closes-Bug: #1996759
Signed-off-by: Lucas Alvares Gomes <[email protected]>
(cherry picked from commit bf44e70)

Author: umago

doc/source/ovn/dhcp_opts.rst

@@ -17,6 +17,7 @@ classless-static-route     classless_static_route
 default-ttl                default_ttl
 dns-server                 dns_server
 domain-name                domain_name
+domain-search              domain_search_list
 ethernet-encap             ethernet_encap
 ip-forward-enable          ip_forward_enable
 lease-time                 lease_time
@@ -67,6 +68,7 @@ wpad                       wpad
 59                         T2
 66                         tftp_server
 67                         bootfile_name
+119                        domain_search_list
 121                        classless_static_route
 150                        tftp_server_address
 210                        path_prefix

neutron/common/ovn/constants.py

@@ -110,6 +110,7 @@
         'log-server': 'log_server',
         'lpr-server': 'lpr_server',
         'domain-name': 'domain_name',
+        'domain-search': 'domain_search_list',
         'swap-server': 'swap_server',
         'policy-filter': 'policy_filter',
         'router-solicitation': 'router_solicitation',
@@ -160,6 +161,7 @@
         '58': 'T1',
         '59': 'T2',
         '67': 'bootfile_name',
+        '119': 'domain_search_list',
         '252': 'wpad',
         '210': 'path_prefix',
         '150': 'tftp_server_address'},
@@ -176,6 +178,7 @@
 # OVN string type DHCP options
 OVN_STR_TYPE_DHCP_OPTS = [
     'domain_name',
+    'domain_search_list',
     'bootfile_name',
     'path_prefix',
     'wpad',

neutron/tests/unit/common/ovn/test_utils.py

@@ -372,6 +372,20 @@ def test_get_lsp_dhcp_opts(self):
                             'bootfile_name': '"homer_simpson.bin"'}
         self.assertEqual(expected_options, options)
 
+    def test_get_lsp_dhcp_opts_for_domain_search(self):
+        opt = {'opt_name': 'domain-search',
+               'opt_value': 'openstack.org,ovn.org',
+               'ip_version': 4}
+        port = {portbindings.VNIC_TYPE: portbindings.VNIC_NORMAL,
+                edo_ext.EXTRADHCPOPTS: [opt]}
+
+        dhcp_disabled, options = utils.get_lsp_dhcp_opts(port, 4)
+        self.assertFalse(dhcp_disabled)
+        # Assert option got translated to "domain_search_list" and
+        # the value is a string (double-quoted)
+        expected_options = {'domain_search_list': '"openstack.org,ovn.org"'}
+        self.assertEqual(expected_options, options)
+
 
 class TestGetDhcpDnsServers(base.BaseTestCase):