Public bug reported: The ovs-ofctl ARP responder implementation (install_arp_responder) sets the correct src/dst MAC addresses in the Ethernet header:
https://github.com/openstack/neutron/blob/master/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/ovs_ofctl/br_tun.py#L197 https://github.com/openstack/neutron/blob/master/neutron/plugins/ml2/drivers/openvswitch/agent/common/constants.py#L110 --> 'move:NXM_OF_ETH_SRC[]->NXM_OF_ETH_DST[],mod_dl_src:%(mac)s,' *However* the native Openflow/ryu install_arp_responder implementation does not set these src/dst fields of the Ethernet header: https://github.com/openstack/neutron/blob/master/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/br_tun.py#L223 The result is that the forged ARP response is incorrect arp_responder=True and of_interface=native: 09:59:47.162196 fa:16:3e:ea:2e:9a > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: Request who-has 192.168.10.1 tell 192.168.10.5, length 28 09:59:47.162426 fa:16:3e:ea:2e:9a > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: Reply 192.168.10.1 is-at fa:16:5e:47:33:64, length 28 ** Affects: neutron Importance: Undecided Status: New ** Tags: ovs -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to neutron. https://bugs.launchpad.net/bugs/1623849 Title: openvswitch native agent, ARP responder response has wrong Eth headers Status in neutron: New Bug description: The ovs-ofctl ARP responder implementation (install_arp_responder) sets the correct src/dst MAC addresses in the Ethernet header: https://github.com/openstack/neutron/blob/master/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/ovs_ofctl/br_tun.py#L197 https://github.com/openstack/neutron/blob/master/neutron/plugins/ml2/drivers/openvswitch/agent/common/constants.py#L110 --> 'move:NXM_OF_ETH_SRC[]->NXM_OF_ETH_DST[],mod_dl_src:%(mac)s,' *However* the native Openflow/ryu install_arp_responder implementation does not set these src/dst fields of the Ethernet header: https://github.com/openstack/neutron/blob/master/neutron/plugins/ml2/drivers/openvswitch/agent/openflow/native/br_tun.py#L223 The result is that the forged ARP response is incorrect arp_responder=True and of_interface=native: 09:59:47.162196 fa:16:3e:ea:2e:9a > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: Request who-has 192.168.10.1 tell 192.168.10.5, length 28 09:59:47.162426 fa:16:3e:ea:2e:9a > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: Reply 192.168.10.1 is-at fa:16:5e:47:33:64, length 28 To manage notifications about this bug go to: https://bugs.launchpad.net/neutron/+bug/1623849/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : [email protected] Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp
