OpenStack Networking (Neutron)
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# Copyright 2012, Nachi Ueno, NTT MCL, Inc.
# 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.
import collections
import netaddr
from oslo_config import cfg
from oslo_log import log as logging
from neutron.agent import firewall
from neutron.agent.linux import ipset_manager
from neutron.agent.linux import iptables_comments as ic
from neutron.agent.linux import iptables_manager
from neutron.common import constants
from neutron.common import ipv6_utils
from neutron.extensions import portsecurity as psec
from neutron.i18n import _LI
LOG = logging.getLogger(__name__)
SG_CHAIN = 'sg-chain'
INGRESS_DIRECTION = 'ingress'
EGRESS_DIRECTION = 'egress'
SPOOF_FILTER = 'spoof-filter'
CHAIN_NAME_PREFIX = {INGRESS_DIRECTION: 'i',
EGRESS_DIRECTION: 'o',
SPOOF_FILTER: 's'}
DIRECTION_IP_PREFIX = {'ingress': 'source_ip_prefix',
'egress': 'dest_ip_prefix'}
IPSET_DIRECTION = {INGRESS_DIRECTION: 'src',
EGRESS_DIRECTION: 'dst'}
LINUX_DEV_LEN = 14
comment_rule = iptables_manager.comment_rule
class IptablesFirewallDriver(firewall.FirewallDriver):
"""Driver which enforces security groups through iptables rules."""
IPTABLES_DIRECTION = {INGRESS_DIRECTION: 'physdev-out',
EGRESS_DIRECTION: 'physdev-in'}
def __init__(self, namespace=None):
self.iptables = iptables_manager.IptablesManager(
use_ipv6=ipv6_utils.is_enabled(),
namespace=namespace)
# TODO(majopela, shihanzhang): refactor out ipset to a separate
# driver composed over this one
self.ipset = ipset_manager.IpsetManager(namespace=namespace)
# list of port which has security group
self.filtered_ports = {}
self.unfiltered_ports = {}
self._add_fallback_chain_v4v6()
self._defer_apply = False
self._pre_defer_filtered_ports = None
self._pre_defer_unfiltered_ports = None
# List of security group rules for ports residing on this host
self.sg_rules = {}
self.pre_sg_rules = None
# List of security group member ips for ports residing on this host
self.sg_members = collections.defaultdict(
lambda: collections.defaultdict(list))
self.pre_sg_members = None
self.enable_ipset = cfg.CONF.SECURITYGROUP.enable_ipset
@property
def ports(self):
return dict(self.filtered_ports, **self.unfiltered_ports)
def update_security_group_rules(self, sg_id, sg_rules):
LOG.debug("Update rules of security group (%s)", sg_id)
self.sg_rules[sg_id] = sg_rules
def update_security_group_members(self, sg_id, sg_members):
LOG.debug("Update members of security group (%s)", sg_id)
self.sg_members[sg_id] = collections.defaultdict(list, sg_members)
def _ps_enabled(self, port):
return port.get(psec.PORTSECURITY, True)
def _set_ports(self, port):
if not self._ps_enabled(port):
self.unfiltered_ports[port['device']] = port
self.filtered_ports.pop(port['device'], None)
else:
self.filtered_ports[port['device']] = port
self.unfiltered_ports.pop(port['device'], None)
def _unset_ports(self, port):
self.unfiltered_ports.pop(port['device'], None)
self.filtered_ports.pop(port['device'], None)
def prepare_port_filter(self, port):
LOG.debug("Preparing device (%s) filter", port['device'])
self._remove_chains()
self._set_ports(port)
# each security group has it own chains
self._setup_chains()
self.iptables.apply()
def update_port_filter(self, port):
LOG.debug("Updating device (%s) filter", port['device'])
if port['device'] not in self.ports:
LOG.info(_LI('Attempted to update port filter which is not '
'filtered %s'), port['device'])
return
self._remove_chains()
self._set_ports(port)
self._setup_chains()
self.iptables.apply()
def remove_port_filter(self, port):
LOG.debug("Removing device (%s) filter", port['device'])
if port['device'] not in self.ports:
LOG.info(_LI('Attempted to remove port filter which is not '
'filtered %r'), port)
return
self._remove_chains()
self._unset_ports(port)
self._setup_chains()
self.iptables.apply()
def _add_accept_rule_port_sec(self, port, direction):
self._update_port_sec_rules(port, direction, add=True)
def _remove_rule_port_sec(self, port, direction):
self._update_port_sec_rules(port, direction, add=False)
def _remove_rule_from_chain_v4v6(self, chain_name, ipv4_rules, ipv6_rules):
for rule in ipv4_rules:
self.iptables.ipv4['filter'].remove_rule(chain_name, rule)
for rule in ipv6_rules:
self.iptables.ipv6['filter'].remove_rule(chain_name, rule)
def _setup_chains(self):
"""Setup ingress and egress chain for a port."""
if not self._defer_apply:
self._setup_chains_apply(self.filtered_ports,
self.unfiltered_ports)
def _setup_chains_apply(self, ports, unfiltered_ports):
self._add_chain_by_name_v4v6(SG_CHAIN)
for port in ports.values():
self._setup_chain(port, INGRESS_DIRECTION)
self._setup_chain(port, EGRESS_DIRECTION)
self.iptables.ipv4['filter'].add_rule(SG_CHAIN, '-j ACCEPT')
self.iptables.ipv6['filter'].add_rule(SG_CHAIN, '-j ACCEPT')
for port in unfiltered_ports.values():
self._add_accept_rule_port_sec(port, INGRESS_DIRECTION)
self._add_accept_rule_port_sec(port, EGRESS_DIRECTION)
def _remove_chains(self):
"""Remove ingress and egress chain for a port."""
if not self._defer_apply:
self._remove_chains_apply(self.filtered_ports,
self.unfiltered_ports)
def _remove_chains_apply(self, ports, unfiltered_ports):
for port in ports.values():
self._remove_chain(port, INGRESS_DIRECTION)
self._remove_chain(port, EGRESS_DIRECTION)
self._remove_chain(port, SPOOF_FILTER)
for port in unfiltered_ports.values():
self._remove_rule_port_sec(port, INGRESS_DIRECTION)
self._remove_rule_port_sec(port, EGRESS_DIRECTION)
self._remove_chain_by_name_v4v6(SG_CHAIN)
def _setup_chain(self, port, DIRECTION):
self._add_chain(port, DIRECTION)
self._add_rules_by_security_group(port, DIRECTION)
def _remove_chain(self, port, DIRECTION):
chain_name = self._port_chain_name(port, DIRECTION)
self._remove_chain_by_name_v4v6(chain_name)
def _add_fallback_chain_v4v6(self):
self.iptables.ipv4['filter'].add_chain('sg-fallback')
self.iptables.ipv4['filter'].add_rule('sg-fallback', '-j DROP',
comment=ic.UNMATCH_DROP)
self.iptables.ipv6['filter'].add_chain('sg-fallback')
self.iptables.ipv6['filter'].add_rule('sg-fallback', '-j DROP',
comment=ic.UNMATCH_DROP)
def _add_raw_chain(self, chain_name):
self.iptables.ipv4['raw'].add_chain(chain_name)
self.iptables.ipv6['raw'].add_chain(chain_name)
def _add_chain_by_name_v4v6(self, chain_name):
self.iptables.ipv4['filter'].add_chain(chain_name)
self.iptables.ipv6['filter'].add_chain(chain_name)
def _remove_raw_chain(self, chain_name):
self.iptables.ipv4['raw'].remove_chain(chain_name)
self.iptables.ipv6['raw'].remove_chain(chain_name)
def _remove_chain_by_name_v4v6(self, chain_name):
self.iptables.ipv4['filter'].remove_chain(chain_name)
self.iptables.ipv6['filter'].remove_chain(chain_name)
def _add_rules_to_chain_v4v6(self, chain_name, ipv4_rules, ipv6_rules,
comment=None):
for rule in ipv4_rules:
self.iptables.ipv4['filter'].add_rule(chain_name, rule,
comment=comment)
for rule in ipv6_rules:
self.iptables.ipv6['filter'].add_rule(chain_name, rule,
comment=comment)
def _get_device_name(self, port):
return port['device']
def _update_port_sec_rules(self, port, direction, add=False):
# add/remove rules in FORWARD and INPUT chain
device = self._get_device_name(port)
jump_rule = ['-m physdev --%s %s --physdev-is-bridged '
'-j ACCEPT' % (self.IPTABLES_DIRECTION[direction],
device)]
if add:
self._add_rules_to_chain_v4v6(
'FORWARD', jump_rule, jump_rule, comment=ic.PORT_SEC_ACCEPT)
else:
self._remove_rule_from_chain_v4v6('FORWARD', jump_rule, jump_rule)
if direction == EGRESS_DIRECTION:
jump_rule = ['-m physdev --%s %s --physdev-is-bridged '
'-j ACCEPT' % (self.IPTABLES_DIRECTION[direction],
device)]
if add:
self._add_rules_to_chain_v4v6('INPUT', jump_rule, jump_rule,
comment=ic.PORT_SEC_ACCEPT)
else:
self._remove_rule_from_chain_v4v6(
'INPUT', jump_rule, jump_rule)
def _add_chain(self, port, direction):
chain_name = self._port_chain_name(port, direction)
self._add_chain_by_name_v4v6(chain_name)
# Note(nati) jump to the security group chain (SG_CHAIN)
# This is needed because the packet may much two rule in port
# if the two port is in the same host
# We accept the packet at the end of SG_CHAIN.
# jump to the security group chain
device = self._get_device_name(port)
jump_rule = ['-m physdev --%s %s --physdev-is-bridged '
'-j $%s' % (self.IPTABLES_DIRECTION[direction],
device,
SG_CHAIN)]
self._add_rules_to_chain_v4v6('FORWARD', jump_rule, jump_rule,
comment=ic.VM_INT_SG)
# jump to the chain based on the device
jump_rule = ['-m physdev --%s %s --physdev-is-bridged '
'-j $%s' % (self.IPTABLES_DIRECTION[direction],
device,
chain_name)]
self._add_rules_to_chain_v4v6(SG_CHAIN, jump_rule, jump_rule,
comment=ic.SG_TO_VM_SG)
if direction == EGRESS_DIRECTION:
self._add_rules_to_chain_v4v6('INPUT', jump_rule, jump_rule,
comment=ic.INPUT_TO_SG)
def _split_sgr_by_ethertype(self, security_group_rules):
ipv4_sg_rules = []
ipv6_sg_rules = []
for rule in security_group_rules:
if rule.get('ethertype') == constants.IPv4:
ipv4_sg_rules.append(rule)
elif rule.get('ethertype') == constants.IPv6:
if rule.get('protocol') == 'icmp':
rule['protocol'] = 'icmpv6'
ipv6_sg_rules.append(rule)
return ipv4_sg_rules, ipv6_sg_rules
def _select_sgr_by_direction(self, port, direction):
return [rule
for rule in port.get('security_group_rules', [])
if rule['direction'] == direction]
def _setup_spoof_filter_chain(self, port, table, mac_ip_pairs, rules):
if mac_ip_pairs:
chain_name = self._port_chain_name(port, SPOOF_FILTER)
table.add_chain(chain_name)
for mac, ip in mac_ip_pairs:
if ip is None:
# If fixed_ips is [] this rule will be added to the end
# of the list after the allowed_address_pair rules.
table.add_rule(chain_name,
'-m mac --mac-source %s -j RETURN'
% mac, comment=ic.PAIR_ALLOW)
else:
table.add_rule(chain_name,
'-m mac --mac-source %s -s %s -j RETURN'
% (mac, ip), comment=ic.PAIR_ALLOW)
table.add_rule(chain_name, '-j DROP', comment=ic.PAIR_DROP)
rules.append('-j $%s' % chain_name)
def _build_ipv4v6_mac_ip_list(self, mac, ip_address, mac_ipv4_pairs,
mac_ipv6_pairs):
if netaddr.IPNetwork(ip_address).version == 4:
mac_ipv4_pairs.append((mac, ip_address))
else:
mac_ipv6_pairs.append((mac, ip_address))
def _spoofing_rule(self, port, ipv4_rules, ipv6_rules):
# Allow dhcp client packets
ipv4_rules += [comment_rule('-p udp -m udp --sport 68 --dport 67 '
'-j RETURN', comment=ic.DHCP_CLIENT)]
# Drop Router Advts from the port.
ipv6_rules += [comment_rule('-p icmpv6 --icmpv6-type %s '
'-j DROP' % constants.ICMPV6_TYPE_RA,
comment=ic.IPV6_RA_DROP)]
ipv6_rules += [comment_rule('-p icmpv6 -j RETURN',
comment=ic.IPV6_ICMP_ALLOW)]
ipv6_rules += [comment_rule('-p udp -m udp --sport 546 --dport 547 '
'-j RETURN', comment=None)]
mac_ipv4_pairs = []
mac_ipv6_pairs = []
if isinstance(port.get('allowed_address_pairs'), list):
for address_pair in port['allowed_address_pairs']:
self._build_ipv4v6_mac_ip_list(address_pair['mac_address'],
address_pair['ip_address'],
mac_ipv4_pairs,
mac_ipv6_pairs)
for ip in port['fixed_ips']:
self._build_ipv4v6_mac_ip_list(port['mac_address'], ip,
mac_ipv4_pairs, mac_ipv6_pairs)
if not port['fixed_ips']:
mac_ipv4_pairs.append((port['mac_address'], None))
mac_ipv6_pairs.append((port['mac_address'], None))
self._setup_spoof_filter_chain(port, self.iptables.ipv4['filter'],
mac_ipv4_pairs, ipv4_rules)
self._setup_spoof_filter_chain(port, self.iptables.ipv6['filter'],
mac_ipv6_pairs, ipv6_rules)
def _drop_dhcp_rule(self, ipv4_rules, ipv6_rules):
#Note(nati) Drop dhcp packet from VM
ipv4_rules += [comment_rule('-p udp -m udp --sport 67 --dport 68 '
'-j DROP', comment=ic.DHCP_SPOOF)]
ipv6_rules += [comment_rule('-p udp -m udp --sport 547 --dport 546 '
'-j DROP', comment=None)]
def _accept_inbound_icmpv6(self):
# Allow multicast listener, neighbor solicitation and
# neighbor advertisement into the instance
icmpv6_rules = []
for icmp6_type in constants.ICMPV6_ALLOWED_TYPES:
icmpv6_rules += ['-p icmpv6 --icmpv6-type %s -j RETURN' %
icmp6_type]
return icmpv6_rules
def _select_sg_rules_for_port(self, port, direction):
"""Select rules from the security groups the port is member of."""
port_sg_ids = port.get('security_groups', [])
port_rules = []
for sg_id in port_sg_ids:
for rule in self.sg_rules.get(sg_id, []):
if rule['direction'] == direction:
if self.enable_ipset:
port_rules.append(rule)
else:
port_rules.extend(
self._expand_sg_rule_with_remote_ips(
rule, port, direction))
return port_rules
def _expand_sg_rule_with_remote_ips(self, rule, port, direction):
"""Expand a remote group rule to rule per remote group IP."""
remote_group_id = rule.get('remote_group_id')
if remote_group_id:
ethertype = rule['ethertype']
port_ips = port.get('fixed_ips', [])
for ip in self.sg_members[remote_group_id][ethertype]:
if ip not in port_ips:
ip_rule = rule.copy()
direction_ip_prefix = DIRECTION_IP_PREFIX[direction]
ip_prefix = str(netaddr.IPNetwork(ip).cidr)
ip_rule[direction_ip_prefix] = ip_prefix
yield ip_rule
else:
yield rule
def _get_remote_sg_ids(self, port, direction=None):
sg_ids = port.get('security_groups', [])
remote_sg_ids = {constants.IPv4: [], constants.IPv6: []}
for sg_id in sg_ids:
for rule in self.sg_rules.get(sg_id, []):
if not direction or rule['direction'] == direction:
remote_sg_id = rule.get('remote_group_id')
ether_type = rule.get('ethertype')
if remote_sg_id and ether_type:
remote_sg_ids[ether_type].append(remote_sg_id)
return remote_sg_ids
def _add_rules_by_security_group(self, port, direction):
# select rules for current port and direction
security_group_rules = self._select_sgr_by_direction(port, direction)
security_group_rules += self._select_sg_rules_for_port(port, direction)
# make sure ipset members are updated for remote security groups
if self.enable_ipset:
remote_sg_ids = self._get_remote_sg_ids(port, direction)
self._update_ipset_members(remote_sg_ids)
# split groups by ip version
# for ipv4, iptables command is used
# for ipv6, iptables6 command is used
ipv4_sg_rules, ipv6_sg_rules = self._split_sgr_by_ethertype(
security_group_rules)
ipv4_iptables_rules = []
ipv6_iptables_rules = []
# include fixed egress/ingress rules
if direction == EGRESS_DIRECTION:
self._add_fixed_egress_rules(port,
ipv4_iptables_rules,
ipv6_iptables_rules)
elif direction == INGRESS_DIRECTION:
ipv6_iptables_rules += self._accept_inbound_icmpv6()
# include IPv4 and IPv6 iptable rules from security group
ipv4_iptables_rules += self._convert_sgr_to_iptables_rules(
ipv4_sg_rules)
ipv6_iptables_rules += self._convert_sgr_to_iptables_rules(
ipv6_sg_rules)
# finally add the rules to the port chain for a given direction
self._add_rules_to_chain_v4v6(self._port_chain_name(port, direction),
ipv4_iptables_rules,
ipv6_iptables_rules)
def _add_fixed_egress_rules(self, port, ipv4_iptables_rules,
ipv6_iptables_rules):
self._spoofing_rule(port,
ipv4_iptables_rules,
ipv6_iptables_rules)
self._drop_dhcp_rule(ipv4_iptables_rules, ipv6_iptables_rules)
def _update_ipset_members(self, security_group_ids):
for ip_version, sg_ids in security_group_ids.items():
for sg_id in sg_ids:
current_ips = self.sg_members[sg_id][ip_version]
if current_ips:
self.ipset.set_members(sg_id, ip_version, current_ips)
def _generate_ipset_rule_args(self, sg_rule, remote_gid):
ethertype = sg_rule.get('ethertype')
ipset_name = self.ipset.get_name(remote_gid, ethertype)
if not self.ipset.set_exists(remote_gid, ethertype):
#NOTE(mangelajo): ipsets for empty groups are not created
# thus we can't reference them.
return None
ipset_direction = IPSET_DIRECTION[sg_rule.get('direction')]
args = self._generate_protocol_and_port_args(sg_rule)
args += ['-m set', '--match-set', ipset_name, ipset_direction]
args += ['-j RETURN']
return args
def _generate_protocol_and_port_args(self, sg_rule):
args = self._protocol_arg(sg_rule.get('protocol'))
args += self._port_arg('sport',
sg_rule.get('protocol'),
sg_rule.get('source_port_range_min'),
sg_rule.get('source_port_range_max'))
args += self._port_arg('dport',
sg_rule.get('protocol'),
sg_rule.get('port_range_min'),
sg_rule.get('port_range_max'))
return args
def _generate_plain_rule_args(self, sg_rule):
# These arguments MUST be in the format iptables-save will
# display them: source/dest, protocol, sport, dport, target
# Otherwise the iptables_manager code won't be able to find
# them to preserve their [packet:byte] counts.
args = self._ip_prefix_arg('s', sg_rule.get('source_ip_prefix'))
args += self._ip_prefix_arg('d', sg_rule.get('dest_ip_prefix'))
args += self._generate_protocol_and_port_args(sg_rule)
args += ['-j RETURN']
return args
def _convert_sg_rule_to_iptables_args(self, sg_rule):
remote_gid = sg_rule.get('remote_group_id')
if self.enable_ipset and remote_gid:
return self._generate_ipset_rule_args(sg_rule, remote_gid)
else:
return self._generate_plain_rule_args(sg_rule)
def _convert_sgr_to_iptables_rules(self, security_group_rules):
iptables_rules = []
self._drop_invalid_packets(iptables_rules)
self._allow_established(iptables_rules)
for rule in security_group_rules:
args = self._convert_sg_rule_to_iptables_args(rule)
if args:
iptables_rules += [' '.join(args)]
iptables_rules += [comment_rule('-j $sg-fallback',
comment=ic.UNMATCHED)]
return iptables_rules
def _drop_invalid_packets(self, iptables_rules):
# Always drop invalid packets
iptables_rules += [comment_rule('-m state --state ' 'INVALID -j DROP',
comment=ic.INVALID_DROP)]
return iptables_rules
def _allow_established(self, iptables_rules):
# Allow established connections
iptables_rules += [comment_rule(
'-m state --state RELATED,ESTABLISHED -j RETURN',
comment=ic.ALLOW_ASSOC)]
return iptables_rules
def _protocol_arg(self, protocol):
if not protocol:
return []
iptables_rule = ['-p', protocol]
# iptables always adds '-m protocol' for udp and tcp
if protocol in ['udp', 'tcp']:
iptables_rule += ['-m', protocol]
return iptables_rule
def _port_arg(self, direction, protocol, port_range_min, port_range_max):
if (protocol not in ['udp', 'tcp', 'icmp', 'icmpv6']
or not port_range_min):
return []
if protocol in ['icmp', 'icmpv6']:
# Note(xuhanp): port_range_min/port_range_max represent
# icmp type/code when protocol is icmp or icmpv6
# icmp code can be 0 so we cannot use "if port_range_max" here
if port_range_max is not None:
return ['--%s-type' % protocol,
'%s/%s' % (port_range_min, port_range_max)]
return ['--%s-type' % protocol, '%s' % port_range_min]
elif port_range_min == port_range_max:
return ['--%s' % direction, '%s' % (port_range_min,)]
else:
return ['-m', 'multiport',
'--%ss' % direction,
'%s:%s' % (port_range_min, port_range_max)]
def _ip_prefix_arg(self, direction, ip_prefix):
#NOTE (nati) : source_group_id is converted to list of source_
# ip_prefix in server side
if ip_prefix:
return ['-%s' % direction, ip_prefix]
return []
def _port_chain_name(self, port, direction):
return iptables_manager.get_chain_name(
'%s%s' % (CHAIN_NAME_PREFIX[direction], port['device'][3:]))
def filter_defer_apply_on(self):
if not self._defer_apply:
self.iptables.defer_apply_on()
self._pre_defer_filtered_ports = dict(self.filtered_ports)
self._pre_defer_unfiltered_ports = dict(self.unfiltered_ports)
self.pre_sg_members = dict(self.sg_members)
self.pre_sg_rules = dict(self.sg_rules)
self._defer_apply = True
def _remove_unused_security_group_info(self):
"""Remove any unnecessary local security group info or unused ipsets.
This function has to be called after applying the last iptables
rules, so we're in a point where no iptable rule depends
on an ipset we're going to delete.
"""
filtered_ports = self.filtered_ports.values()
remote_sgs_to_remove = self._determine_remote_sgs_to_remove(
filtered_ports)
for ip_version, remote_sg_ids in remote_sgs_to_remove.iteritems():
self._clear_sg_members(ip_version, remote_sg_ids)
if self.enable_ipset:
self._remove_ipsets_for_remote_sgs(ip_version, remote_sg_ids)
self._remove_unused_sg_members()
# Remove unused security group rules
for remove_group_id in self._determine_sg_rules_to_remove(
filtered_ports):
self.sg_rules.pop(remove_group_id, None)
def _determine_remote_sgs_to_remove(self, filtered_ports):
"""Calculate which remote security groups we don't need anymore.
We do the calculation for each ip_version.
"""
sgs_to_remove_per_ipversion = {constants.IPv4: set(),
constants.IPv6: set()}
remote_group_id_sets = self._get_remote_sg_ids_sets_by_ipversion(
filtered_ports)
for ip_version, remote_group_id_set in (
remote_group_id_sets.iteritems()):
sgs_to_remove_per_ipversion[ip_version].update(
set(self.pre_sg_members) - remote_group_id_set)
return sgs_to_remove_per_ipversion
def _get_remote_sg_ids_sets_by_ipversion(self, filtered_ports):
"""Given a port, calculates the remote sg references by ip_version."""
remote_group_id_sets = {constants.IPv4: set(),
constants.IPv6: set()}
for port in filtered_ports:
for ip_version, sg_ids in self._get_remote_sg_ids(
port).iteritems():
remote_group_id_sets[ip_version].update(sg_ids)
return remote_group_id_sets
def _determine_sg_rules_to_remove(self, filtered_ports):
"""Calculate which security groups need to be removed.
We find out by subtracting our previous sg group ids,
with the security groups associated to a set of ports.
"""
port_group_ids = self._get_sg_ids_set_for_ports(filtered_ports)
return set(self.pre_sg_rules) - port_group_ids
def _get_sg_ids_set_for_ports(self, filtered_ports):
"""Get the port security group ids as a set."""
port_group_ids = set()
for port in filtered_ports:
port_group_ids.update(port.get('security_groups', []))
return port_group_ids
def _clear_sg_members(self, ip_version, remote_sg_ids):
"""Clear our internal cache of sg members matching the parameters."""
for remote_sg_id in remote_sg_ids:
if self.sg_members[remote_sg_id][ip_version]:
self.sg_members[remote_sg_id][ip_version] = []
def _remove_ipsets_for_remote_sgs(self, ip_version, remote_sg_ids):
"""Remove system ipsets matching the provided parameters."""
for remote_sg_id in remote_sg_ids:
self.ipset.destroy(remote_sg_id, ip_version)
def _remove_unused_sg_members(self):
"""Remove sg_member entries where no IPv4 or IPv6 is associated."""
for sg_id in self.sg_members.keys():
sg_has_members = (self.sg_members[sg_id][constants.IPv4] or
self.sg_members[sg_id][constants.IPv6])
if not sg_has_members:
del self.sg_members[sg_id]
def filter_defer_apply_off(self):
if self._defer_apply:
self._defer_apply = False
self._remove_chains_apply(self._pre_defer_filtered_ports,
self._pre_defer_unfiltered_ports)
self._setup_chains_apply(self.filtered_ports,
self.unfiltered_ports)
self.iptables.defer_apply_off()
self._remove_unused_security_group_info()
self._pre_defer_filtered_ports = None
self._pre_defer_unfiltered_ports = None
class OVSHybridIptablesFirewallDriver(IptablesFirewallDriver):
OVS_HYBRID_TAP_PREFIX = constants.TAP_DEVICE_PREFIX
def _port_chain_name(self, port, direction):
return iptables_manager.get_chain_name(
'%s%s' % (CHAIN_NAME_PREFIX[direction], port['device']))
def _get_device_name(self, port):
return (self.OVS_HYBRID_TAP_PREFIX + port['device'])[:LINUX_DEV_LEN]
def _get_br_device_name(self, port):
return ('qvb' + port['device'])[:LINUX_DEV_LEN]
def _get_jump_rule(self, port, direction):
if direction == INGRESS_DIRECTION:
device = self._get_br_device_name(port)
else:
device = self._get_device_name(port)
jump_rule = '-m physdev --physdev-in %s -j CT --zone %s' % (
device, port['zone_id'])
return jump_rule
def _add_raw_chain_rules(self, port, direction):
if port['zone_id']:
jump_rule = self._get_jump_rule(port, direction)
self.iptables.ipv4['raw'].add_rule('PREROUTING', jump_rule)
self.iptables.ipv6['raw'].add_rule('PREROUTING', jump_rule)
def _remove_raw_chain_rules(self, port, direction):
if port['zone_id']:
jump_rule = self._get_jump_rule(port, direction)
self.iptables.ipv4['raw'].remove_rule('PREROUTING', jump_rule)
self.iptables.ipv6['raw'].remove_rule('PREROUTING', jump_rule)
def _add_chain(self, port, direction):
super(OVSHybridIptablesFirewallDriver, self)._add_chain(port,
direction)
if direction in [INGRESS_DIRECTION, EGRESS_DIRECTION]:
self._add_raw_chain_rules(port, direction)
def _remove_chain(self, port, direction):
super(OVSHybridIptablesFirewallDriver, self)._remove_chain(port,
direction)
if direction in [INGRESS_DIRECTION, EGRESS_DIRECTION]:
self._remove_raw_chain_rules(port, direction)