Comment 89 for bug 1274034

Reviewed: https://review.openstack.org/209705
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=bf28c724ddbe8f7e67f91513da5f302d5372314d
Submitter: Jenkins
Branch: stable/kilo

commit bf28c724ddbe8f7e67f91513da5f302d5372314d
Author: Kevin Benton <email address hidden>
Date: Mon Jun 29 21:05:08 2015 -0700

    Add ARP spoofing protection for LinuxBridge agent

    This patch adds ARP spoofing protection for the Linux Bridge
    agent based on ebtables. This code was written to be minimally
    invasive with the intent of back-porting to Kilo.

    The protection is enabled and disabled with the same
    'prevent_arp_spoofing' agent config flag added for the OVS agent
    in I7c079b779245a0af6bc793564fa8a560e4226afe.

    The protection works by setting up an ebtables chain for each port
    and jumping all ARP traffic to that chain. The port-specific chains
    have a default DROP policy and then have allow rules installed that
    only allow ARP traffic with a source CIDR that matches one of the
    port's fixed IPs or an allowed address pair.

    Since this is a back-port to Kilo, it is disabled by default just
    like the protection added for OVS.

    This patch additionally pulls back the required ebtables filter and
    the functional test helpers to support the tests.

    Conflicts:
     neutron/plugins/linuxbridge/agent/linuxbridge_neutron_agent.py
     neutron/plugins/linuxbridge/common/config.py
     neutron/tests/common/machine_fixtures.py

    Closes-Bug: #1274034
    Change-Id: I0b0e3b1272472385dff060897ecbd25e93fd78e7
    (cherry picked from commit 04197bc4bbf2bc611371060db839028c2686f87a)