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#!/usr/bin/env python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2011 OpenStack Foundation
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
This script is used to configure openvswitch flows on XenServer hosts.
"""
import os
import simplejson as json
import sys
# This is written to Python 2.4, since that is what is available on XenServer
import netaddr
import novalib
OVS_OFCTL = '/usr/bin/ovs-ofctl'
class OvsFlow(object):
def __init__(self, bridge, params):
self.bridge = bridge
self.params = params
def add(self, rule):
novalib.execute(OVS_OFCTL, 'add-flow', self.bridge, rule % self.params)
def clear_flows(self, ofport):
novalib.execute(OVS_OFCTL, 'del-flows',
self.bridge, "in_port=%s" % ofport)
def main(command, vif_raw, net_type):
if command not in ('online', 'offline'):
return
vif_name, dom_id, vif_index = vif_raw.split('-')
vif = "%s%s.%s" % (vif_name, dom_id, vif_index)
bridge = novalib.execute_get_output('/usr/bin/ovs-vsctl',
'iface-to-br', vif)
xsls = novalib.execute_get_output('/usr/bin/xenstore-ls',
'/local/domain/%s/vm-data/networking' % dom_id)
macs = [line.split("=")[0].strip() for line in xsls.splitlines()]
for mac in macs:
xsread = novalib.execute_get_output('/usr/bin/xenstore-read',
'/local/domain/%s/vm-data/networking/%s' %
(dom_id, mac))
data = json.loads(xsread)
if data["label"] == "public":
this_vif = "vif%s.0" % dom_id
phys_dev = "eth0"
else:
this_vif = "vif%s.1" % dom_id
phys_dev = "eth1"
if vif == this_vif:
vif_ofport = novalib.execute_get_output('/usr/bin/ovs-vsctl',
'get', 'Interface', vif, 'ofport')
phys_ofport = novalib.execute_get_output('/usr/bin/ovs-vsctl',
'get', 'Interface', phys_dev, 'ofport')
params = dict(VIF_NAME=vif,
MAC=data['mac'],
OF_PORT=vif_ofport,
PHYS_PORT=phys_ofport)
ovs = OvsFlow(bridge, params)
if command == 'offline':
# I haven't found a way to clear only IPv4 or IPv6 rules.
ovs.clear_flows(vif_ofport)
if command == 'online':
if net_type in ('ipv4', 'all') and 'ips' in data:
for ip4 in data['ips']:
ovs.params.update({'IPV4_ADDR': ip4['ip']})
apply_ovs_ipv4_flows(ovs, bridge, params)
if net_type in ('ipv6', 'all') and 'ip6s' in data:
for ip6 in data['ip6s']:
mac_eui64 = netaddr.EUI(data['mac']).eui64()
link_local = str(mac_eui64.ipv6_link_local())
ovs.params.update({'IPV6_LINK_LOCAL_ADDR': link_local})
ovs.params.update({'IPV6_GLOBAL_ADDR': ip6['ip']})
apply_ovs_ipv6_flows(ovs, bridge, params)
def apply_ovs_ipv4_flows(ovs, bridge, params):
# When ARP traffic arrives from a vif, push it to virtual port
# 9999 for further processing
ovs.add("priority=4,arp,in_port=%(OF_PORT)s,dl_src=%(MAC)s,"
"nw_src=%(IPV4_ADDR)s,arp_sha=%(MAC)s,actions=resubmit:9999")
ovs.add("priority=4,arp,in_port=%(OF_PORT)s,dl_src=%(MAC)s,"
"nw_src=0.0.0.0,arp_sha=%(MAC)s,actions=resubmit:9999")
# When IP traffic arrives from a vif, push it to virtual port 9999
# for further processing
ovs.add("priority=4,ip,in_port=%(OF_PORT)s,dl_src=%(MAC)s,"
"nw_src=%(IPV4_ADDR)s,actions=resubmit:9999")
# Drop IP bcast/mcast
ovs.add("priority=6,ip,in_port=%(OF_PORT)s,dl_dst=ff:ff:ff:ff:ff:ff,"
"actions=drop")
ovs.add("priority=5,ip,in_port=%(OF_PORT)s,nw_dst=224.0.0.0/4,"
"actions=drop")
ovs.add("priority=5,ip,in_port=%(OF_PORT)s,nw_dst=240.0.0.0/4,"
"actions=drop")
# Pass ARP requests coming from any VMs on the local HV (port
# 9999) or coming from external sources (PHYS_PORT) to the VM and
# physical NIC. We output this to the physical NIC as well, since
# with instances of shared ip groups, the active host for the
# destination IP might be elsewhere...
ovs.add("priority=3,arp,in_port=9999,nw_dst=%(IPV4_ADDR)s,"
"actions=output:%(OF_PORT)s,output:%(PHYS_PORT)s")
# Pass ARP traffic originating from external sources the VM with
# the matching IP address
ovs.add("priority=3,arp,in_port=%(PHYS_PORT)s,nw_dst=%(IPV4_ADDR)s,"
"actions=output:%(OF_PORT)s")
# Pass ARP traffic from one VM (src mac already validated) to
# another VM on the same HV
ovs.add("priority=3,arp,in_port=9999,dl_dst=%(MAC)s,"
"actions=output:%(OF_PORT)s")
# Pass ARP replies coming from the external environment to the
# target VM
ovs.add("priority=3,arp,in_port=%(PHYS_PORT)s,dl_dst=%(MAC)s,"
"actions=output:%(OF_PORT)s")
# ALL IP traffic: Pass IP data coming from any VMs on the local HV
# (port 9999) or coming from external sources (PHYS_PORT) to the
# VM and physical NIC. We output this to the physical NIC as
# well, since with instances of shared ip groups, the active host
# for the destination IP might be elsewhere...
ovs.add("priority=3,ip,in_port=9999,dl_dst=%(MAC)s,"
"nw_dst=%(IPV4_ADDR)s,actions=output:%(OF_PORT)s,"
"output:%(PHYS_PORT)s")
# Pass IP traffic from the external environment to the VM
ovs.add("priority=3,ip,in_port=%(PHYS_PORT)s,dl_dst=%(MAC)s,"
"nw_dst=%(IPV4_ADDR)s,actions=output:%(OF_PORT)s")
# Send any local traffic to the physical NIC's OVS port for
# physical network learning
ovs.add("priority=2,in_port=9999,actions=output:%(PHYS_PORT)s")
def apply_ovs_ipv6_flows(ovs, bridge, params):
# allow valid IPv6 ND outbound (are both global and local IPs needed?)
# Neighbor Solicitation
ovs.add("priority=6,in_port=%(OF_PORT)s,dl_src=%(MAC)s,icmp6,"
"ipv6_src=%(IPV6_LINK_LOCAL_ADDR)s,icmp_type=135,nd_sll=%(MAC)s,"
"actions=normal")
ovs.add("priority=6,in_port=%(OF_PORT)s,dl_src=%(MAC)s,icmp6,"
"ipv6_src=%(IPV6_LINK_LOCAL_ADDR)s,icmp_type=135,actions=normal")
ovs.add("priority=6,in_port=%(OF_PORT)s,dl_src=%(MAC)s,icmp6,"
"ipv6_src=%(IPV6_GLOBAL_ADDR)s,icmp_type=135,nd_sll=%(MAC)s,"
"actions=normal")
ovs.add("priority=6,in_port=%(OF_PORT)s,dl_src=%(MAC)s,icmp6,"
"ipv6_src=%(IPV6_GLOBAL_ADDR)s,icmp_type=135,actions=normal")
# Neighbor Advertisement
ovs.add("priority=6,in_port=%(OF_PORT)s,dl_src=%(MAC)s,icmp6,"
"ipv6_src=%(IPV6_LINK_LOCAL_ADDR)s,icmp_type=136,"
"nd_target=%(IPV6_LINK_LOCAL_ADDR)s,actions=normal")
ovs.add("priority=6,in_port=%(OF_PORT)s,dl_src=%(MAC)s,icmp6,"
"ipv6_src=%(IPV6_LINK_LOCAL_ADDR)s,icmp_type=136,actions=normal")
ovs.add("priority=6,in_port=%(OF_PORT)s,dl_src=%(MAC)s,icmp6,"
"ipv6_src=%(IPV6_GLOBAL_ADDR)s,icmp_type=136,"
"nd_target=%(IPV6_GLOBAL_ADDR)s,actions=normal")
ovs.add("priority=6,in_port=%(OF_PORT)s,dl_src=%(MAC)s,icmp6,"
"ipv6_src=%(IPV6_GLOBAL_ADDR)s,icmp_type=136,actions=normal")
# drop all other neighbor discovery (req b/c we permit all icmp6 below)
ovs.add("priority=5,in_port=%(OF_PORT)s,icmp6,icmp_type=135,actions=drop")
ovs.add("priority=5,in_port=%(OF_PORT)s,icmp6,icmp_type=136,actions=drop")
# do not allow sending specifc ICMPv6 types
# Router Advertisement
ovs.add("priority=5,in_port=%(OF_PORT)s,icmp6,icmp_type=134,actions=drop")
# Redirect Gateway
ovs.add("priority=5,in_port=%(OF_PORT)s,icmp6,icmp_type=137,actions=drop")
# Mobile Prefix Solicitation
ovs.add("priority=5,in_port=%(OF_PORT)s,icmp6,icmp_type=146,actions=drop")
# Mobile Prefix Advertisement
ovs.add("priority=5,in_port=%(OF_PORT)s,icmp6,icmp_type=147,actions=drop")
# Multicast Router Advertisement
ovs.add("priority=5,in_port=%(OF_PORT)s,icmp6,icmp_type=151,actions=drop")
# Multicast Router Solicitation
ovs.add("priority=5,in_port=%(OF_PORT)s,icmp6,icmp_type=152,actions=drop")
# Multicast Router Termination
ovs.add("priority=5,in_port=%(OF_PORT)s,icmp6,icmp_type=153,actions=drop")
# allow valid IPv6 outbound, by type
ovs.add("priority=4,in_port=%(OF_PORT)s,dl_src=%(MAC)s,"
"ipv6_src=%(IPV6_GLOBAL_ADDR)s,icmp6,actions=normal")
ovs.add("priority=4,in_port=%(OF_PORT)s,dl_src=%(MAC)s,"
"ipv6_src=%(IPV6_LINK_LOCAL_ADDR)s,icmp6,actions=normal")
ovs.add("priority=4,in_port=%(OF_PORT)s,dl_src=%(MAC)s,"
"ipv6_src=%(IPV6_GLOBAL_ADDR)s,tcp6,actions=normal")
ovs.add("priority=4,in_port=%(OF_PORT)s,dl_src=%(MAC)s,"
"ipv6_src=%(IPV6_LINK_LOCAL_ADDR)s,tcp6,actions=normal")
ovs.add("priority=4,in_port=%(OF_PORT)s,dl_src=%(MAC)s,"
"ipv6_src=%(IPV6_GLOBAL_ADDR)s,udp6,actions=normal")
ovs.add("priority=4,in_port=%(OF_PORT)s,dl_src=%(MAC)s,"
"ipv6_src=%(IPV6_LINK_LOCAL_ADDR)s,udp6,actions=normal")
# all else will be dropped ...
if __name__ == "__main__":
if len(sys.argv) != 4:
print ("usage: %s [online|offline] vif-domid-idx [ipv4|ipv6|all] " %
os.path.basename(sys.argv[0]))
sys.exit(1)
else:
command, vif_raw, net_type = sys.argv[1:4]
main(command, vif_raw, net_type)
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