openstack
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neutron
Code Issues Proposed changes

DHCP Agent: Separate local from non-local subnets

Browse Source 
In order to allow the DHCP agent to service other subnets on the
network in other segments via DHCP relay, we need to use the
'non_local_subnets' network attribute returned by rpc to set up dhcp
for off-link subnets.

Change-Id: I88e1c574bc429dc599ad7c956c03fa0688338186
Closes-Bug: 1692486
changes/44/468744/11
Harald Jensas 6 years ago committed by Brian Haley
parent 4dc81f0a53
commit d2b82168cd
4 changed files with 72 additions and 16 deletions
Show Stats Download Patch File Download Diff File

19
neutron/agent/dhcp/agent.py
Unescape View File

@ -109,7 +109,8 @@ class DhcpAgent(manager.Manager):
self.conf
)
for net_id in existing_networks:
net = dhcp.NetModel({"id": net_id, "subnets": [], "ports": []})
net = dhcp.NetModel({"id": net_id, "subnets": [],
"non_local_subnets": [], "ports": []})
self.cache.put(net)
except NotImplementedError:
# just go ahead with an empty networks cache
@ -334,8 +335,12 @@ class DhcpAgent(manager.Manager):
return
# NOTE(kevinbenton): we don't exclude dhcp disabled subnets because
# they still change the indexes used for tags
old_cidrs = [s.cidr for s in old_network.subnets]
new_cidrs = [s.cidr for s in network.subnets]
old_non_local_subnets = getattr(old_network, 'non_local_subnets', [])
new_non_local_subnets = getattr(network, 'non_local_subnets', [])
old_cidrs = [s.cidr for s in (old_network.subnets +
old_non_local_subnets)]
new_cidrs = [s.cidr for s in (network.subnets +
new_non_local_subnets)]
if old_cidrs == new_cidrs:
self.call_driver('reload_allocations', network)
self.cache.put(network)
@ -639,7 +644,8 @@ class NetworkCache(object):
self.cache[network.id] = network
for subnet in network.subnets:
non_local_subnets = getattr(network, 'non_local_subnets', [])
for subnet in (network.subnets + non_local_subnets):
self.subnet_lookup[subnet.id] = network.id
for port in network.ports:
@ -648,7 +654,8 @@ class NetworkCache(object):
def remove(self, network):
del self.cache[network.id]
for subnet in network.subnets:
non_local_subnets = getattr(network, 'non_local_subnets', [])
for subnet in (network.subnets + non_local_subnets):
del self.subnet_lookup[subnet.id]
for port in network.ports:
@ -688,7 +695,9 @@ class NetworkCache(object):
num_ports = 0
for net_id in net_ids:
network = self.get_network_by_id(net_id)
non_local_subnets = getattr(network, 'non_local_subnets', [])
num_subnets += len(network.subnets)
num_subnets += len(non_local_subnets)
num_ports += len(network.ports)
return {'networks': num_nets,
'subnets': num_subnets,

30
neutron/agent/linux/dhcp.py
Unescape View File

@ -195,6 +195,11 @@ class DhcpLocalProcess(DhcpBase):
def _remove_config_files(self):
shutil.rmtree(self.network_conf_dir, ignore_errors=True)
@staticmethod
def _get_all_subnets(network):
non_local_subnets = getattr(network, 'non_local_subnets', [])
return network.subnets + non_local_subnets
def _enable_dhcp(self):
"""check if there is a subnet within the network with dhcp enabled."""
for subnet in self.network.subnets:
@ -346,7 +351,7 @@ class Dnsmasq(DhcpLocalProcess):
]
possible_leases = 0
for i, subnet in enumerate(self.network.subnets):
for i, subnet in enumerate(self._get_all_subnets(self.network)):
mode = None
# if a subnet is specified to have dhcp disabled
if not subnet.enable_dhcp:
@ -562,7 +567,8 @@ class Dnsmasq(DhcpLocalProcess):
)
"""
v6_nets = dict((subnet.id, subnet) for subnet in
self.network.subnets if subnet.ip_version == 6)
self._get_all_subnets(self.network)
if subnet.ip_version == 6)
for port in self.network.ports:
fixed_ips = self._sort_fixed_ips_for_dnsmasq(port.fixed_ips,
@ -625,7 +631,8 @@ class Dnsmasq(DhcpLocalProcess):
timestamp = 0
else:
timestamp = int(time.time()) + self.conf.dhcp_lease_duration
dhcp_enabled_subnet_ids = [s.id for s in self.network.subnets
dhcp_enabled_subnet_ids = [s.id for s in
self._get_all_subnets(self.network)
if s.enable_dhcp]
for host_tuple in self._iter_hosts():
port, alloc, hostname, name, no_dhcp, no_opts = host_tuple
@ -674,7 +681,8 @@ class Dnsmasq(DhcpLocalProcess):
filename = self.get_conf_file_name('host')
LOG.debug('Building host file: %s', filename)
dhcp_enabled_subnet_ids = [s.id for s in self.network.subnets
dhcp_enabled_subnet_ids = [s.id for s in
self._get_all_subnets(self.network)
if s.enable_dhcp]
# NOTE(ihrachyshka): the loop should not log anything inside it, to
# avoid potential performance drop when lots of hosts are dumped
@ -867,7 +875,7 @@ class Dnsmasq(DhcpLocalProcess):
if self.conf.enable_isolated_metadata or self.conf.force_metadata:
subnet_to_interface_ip = self._make_subnet_interface_ip_map()
isolated_subnets = self.get_isolated_subnets(self.network)
for i, subnet in enumerate(self.network.subnets):
for i, subnet in enumerate(self._get_all_subnets(self.network)):
addr_mode = getattr(subnet, 'ipv6_address_mode', None)
segment_id = getattr(subnet, 'segment_id', None)
if (not subnet.enable_dhcp or
@ -915,7 +923,7 @@ class Dnsmasq(DhcpLocalProcess):
)
if subnet.ip_version == 4:
for s in self.network.subnets:
for s in self._get_all_subnets(self.network):
sub_segment_id = getattr(s, 'segment_id', None)
if (s.ip_version == 4 and
s.cidr != subnet.cidr and
@ -1046,7 +1054,8 @@ class Dnsmasq(DhcpLocalProcess):
gateway. The port must be owned by a neutron router.
"""
isolated_subnets = collections.defaultdict(lambda: True)
subnets = dict((subnet.id, subnet) for subnet in network.subnets)
all_subnets = cls._get_all_subnets(network)
subnets = dict((subnet.id, subnet) for subnet in all_subnets)
for port in network.ports:
if port.device_owner not in constants.ROUTER_INTERFACE_OWNERS:
@ -1074,7 +1083,8 @@ class Dnsmasq(DhcpLocalProcess):
with 3rd party backends.
"""
# Only IPv4 subnets, with dhcp enabled, will use the metadata proxy.
v4_dhcp_subnets = [s for s in network.subnets
all_subnets = cls._get_all_subnets(network)
v4_dhcp_subnets = [s for s in all_subnets
if s.ip_version == 4 and s.enable_dhcp]
if not v4_dhcp_subnets:
return False
@ -1089,7 +1099,7 @@ class Dnsmasq(DhcpLocalProcess):
# check if the network has a metadata subnet
meta_cidr = netaddr.IPNetwork(METADATA_DEFAULT_CIDR)
if any(netaddr.IPNetwork(s.cidr) in meta_cidr
for s in network.subnets):
for s in all_subnets):
return True
isolated_subnets = cls.get_isolated_subnets(network)
@ -1294,7 +1304,7 @@ class DeviceManager(object):
# The ID that the DHCP port will have (or already has).
device_id = self.get_device_id(network)
# Get the set of DHCP-enabled subnets on this network.
# Get the set of DHCP-enabled local subnets on this network.
dhcp_subnets = {subnet.id: subnet for subnet in network.subnets
if subnet.enable_dhcp}

5
neutron/tests/functional/agent/test_dhcp_agent.py
Unescape View File

@ -136,12 +136,15 @@ class DHCPAgentOVSTestFramework(base.BaseSudoTestCase):
"ip_address": ip_address}], })
return port_dict
def create_network_dict(self, net_id, subnets=None, ports=None):
def create_network_dict(self, net_id, subnets=None, ports=None,
non_local_subnets=None):
subnets = [] if not subnets else subnets
ports = [] if not ports else ports
non_local_subnets = [] if not non_local_subnets else non_local_subnets
net_dict = dhcp.NetModel(d={
"id": net_id,
"subnets": subnets,
"non_local_subnets": non_local_subnets,
"ports": ports,
"admin_state_up": True,
"tenant_id": uuidutils.generate_uuid(), })

34
neutron/tests/unit/agent/linux/test_dhcp.py
Unescape View File

@ -405,6 +405,14 @@ class FakeV4SubnetSegmentID(FakeV4Subnet):
self.segment_id = 1
class FakeV4SubnetSegmentID2(FakeV4Subnet):
def __init__(self):
super(FakeV4SubnetSegmentID2, self).__init__()
self.id = 'jjjjjjjj-jjjj-jjjj-jjjj-jjjjjjjjjjjj'
self.host_routes = []
self.segment_id = 2
class FakeV4MetadataSubnet(FakeV4Subnet):
def __init__(self):
super(FakeV4MetadataSubnet, self).__init__()
@ -685,6 +693,15 @@ class FakeDualNetworkDualDHCPOnLinkSubnetRoutesDisabled(object):
self.namespace = 'qdhcp-ns'
class FakeNonLocalSubnets(object):
def __init__(self):
self.id = 'cccccccc-cccc-cccc-cccc-cccccccccccc'
self.subnets = [FakeV4SubnetSegmentID2()]
self.non_local_subnets = [FakeV4SubnetSegmentID()]
self.ports = [FakePort1(), FakeRouterPort(), FakeRouterPortSegmentID()]
self.namespace = 'qdhcp-ns'
class FakeDualNetworkTriDHCPOneOnLinkSubnetRoute(object):
def __init__(self):
self.id = 'cccccccc-cccc-cccc-cccc-cccccccccccc'
@ -1522,6 +1539,23 @@ class TestDnsmasq(TestBase):
self._test_output_opts_file(expected, FakeV4NoGatewayNetwork(),
ipm_retval=ipm_retval)
def test_non_local_subnets(self):
expected = (
'tag:tag0,option:dns-server,8.8.8.8\n'
'tag:tag0,option:classless-static-route,'
'169.254.169.254/32,192.168.0.1,0.0.0.0/0,192.168.0.1\n'
'tag:tag0,249,169.254.169.254/32,192.168.0.1,'
'0.0.0.0/0,192.168.0.1\ntag:tag0,option:router,192.168.0.1\n'
'tag:tag1,option:dns-server,8.8.8.8\n'
'tag:tag1,option:classless-static-route,'
'169.254.169.254/32,192.168.2.1,0.0.0.0/0,192.168.2.1\n'
'tag:tag1,249,169.254.169.254/32,192.168.2.1,'
'0.0.0.0/0,192.168.2.1\n'
'tag:tag1,option:router,192.168.2.1').lstrip()
ipm_retval = {FakeV4SubnetSegmentID2().id: '192.168.0.1'}
self._test_output_opts_file(expected, FakeNonLocalSubnets(),
ipm_retval=ipm_retval)
def test_output_opts_file_no_neutron_router_on_subnet(self):
expected = (
'tag:tag0,option:classless-static-route,'

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