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Prior to this patch OVN did not validate any extra DHCP option passed to the port leading to confusion because the user of the API could just input any value and OVN would accept it (returning 200) but ignoring the option internally. This patch now adds such validations on port creation and update. This patch also sync with the latest supported DHCP options from OVN and create a map between the different names and option codes to their OVN counterpart. Closes-bug: #1874282 Change-Id: I99799e54e941cdd8da2614feecad1ef6299703fc Signed-off-by: Lucas Alvares Gomes <lucasagomes@gmail.com>changes/25/722025/8
Lucas Alvares Gomes
2 years ago
7 changed files with 446 additions and 13 deletions
@ -0,0 +1,138 @@
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.. _ovn_dhcp_opts: |
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OVN supported DHCP options |
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========================== |
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This is a list of the current supported DHCP options in ML2/OVN: |
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IP version 4 |
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~~~~~~~~~~~~ |
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========================== ============================ |
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Option name / code OVN value |
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========================== ============================ |
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arp-timeout arp_cache_timeout |
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bootfile-name bootfile_name |
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classless-static-route classless_static_route |
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default-ttl default_ttl |
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dns-server dns_server |
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domain-name domain_name |
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ethernet-encap ethernet_encap |
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ip-forward-enable ip_forward_enable |
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lease-time lease_time |
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log-server log_server |
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lpr-server lpr_server |
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ms-classless-static-route ms_classless_static_route |
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mtu mtu |
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netmask netmask |
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nis-server nis_server |
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ntp-server ntp_server |
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path-prefix path_prefix |
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policy-filter policy_filter |
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router-discovery router_discovery |
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router router |
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router-solicitation router_solicitation |
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server-id server_id |
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server-ip-address tftp_server_address |
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swap-server swap_server |
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T1 T1 |
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T2 T2 |
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tcp-ttl tcp_ttl |
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tcp-keepalive tcp_keepalive_interval |
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tftp-server-address tftp_server_address |
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tftp-server tftp_server |
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wpad wpad |
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1 netmask |
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3 router |
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6 dns_server |
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7 log_server |
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9 lpr_server |
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15 domain_name |
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16 swap_server |
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19 ip_forward_enable |
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21 policy_filter |
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23 default_ttl |
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26 mtu |
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31 router_discovery |
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32 router_solicitation |
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35 arp_cache_timeout |
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36 ethernet_encap |
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37 tcp_ttl |
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38 tcp_keepalive_interval |
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41 nis_server |
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42 ntp_server |
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51 lease_time |
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54 server_id |
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58 T1 |
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59 T2 |
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66 tftp_server |
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67 bootfile_name |
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121 classless_static_route |
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150 tftp_server_address |
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210 path_prefix |
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249 ms_classless_static_route |
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252 wpad |
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========================== ============================ |
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IP version 6 |
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~~~~~~~~~~~~ |
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================== ============= |
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Option name / code OVN value |
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================== ============= |
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dns-server dns_server |
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domain-search domain_search |
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ia-addr ip_addr |
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server-id server_id |
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2 server_id |
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5 ia_addr |
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23 dns_server |
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24 domain_search |
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================== ============= |
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OVN Database information |
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~~~~~~~~~~~~~~~~~~~~~~~~ |
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In OVN the DHCP options are stored on a table called ``DHCP_Options`` |
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in the OVN Northbound database. |
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Let's add a DHCP option to a Neutron port: |
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.. code-block:: bash |
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$ neutron port-update --extra-dhcp-opt opt_name='server-ip-address',opt_value='10.0.0.1' b4c3f265-369e-4bf5-8789-7caa9a1efb9c |
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Updated port: b4c3f265-369e-4bf5-8789-7caa9a1efb9c |
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.. end |
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To find that port in OVN we can use command below: |
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.. code-block:: bash |
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$ ovn-nbctl find Logical_Switch_Port name=b4c3f265-369e-4bf5-8789-7caa9a1efb9c |
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... |
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dhcpv4_options : 5f00d1a2-c57d-4d1f-83ea-09bf8be13288 |
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dhcpv6_options : [] |
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... |
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.. end |
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For DHCP, the columns that we care about are the ``dhcpv4_options`` |
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and ``dhcpv6_options``. These columns has the uuids of entries in the |
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``DHCP_Options`` table with the DHCP information for this port. |
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.. code-block:: bash |
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$ ovn-nbctl list DHCP_Options 5f00d1a2-c57d-4d1f-83ea-09bf8be13288 |
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_uuid : 5f00d1a2-c57d-4d1f-83ea-09bf8be13288 |
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cidr : "10.0.0.0/26" |
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external_ids : {"neutron:revision_number"="0", port_id="b4c3f265-369e-4bf5-8789-7caa9a1efb9c", subnet_id="5157ed8b-e7f1-4c56-b789-fa420098a687"} |
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options : {classless_static_route="{169.254.169.254/32,10.0.0.2, 0.0.0.0/0,10.0.0.1}", dns_server="{8.8.8.8}", domain_name="\"openstackgate.local\"", lease_time="43200", log_server="127.0.0.3", mtu="1442", router="10.0.0.1", server_id="10.0.0.1", server_mac="fa:16:3e:dc:57:22", tftp_server_address="10.0.0.1"} |
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.. end |
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Here you can see that the option ``tftp_server_address`` has been set in |
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the **options** column. Note that, the ``tftp_server_address`` option is |
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the OVN translated name for ``server-ip-address`` (option 150). Take a |
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look at the table in this document to find out more about the supported |
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options and their counterpart names in OVN. |
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