** Also affects: neutron/kilo
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1443798
Title:
Restrict netmask of CIDR to avoid DHCP resync
Status in OpenStack Neutron (virtual network service):
In Progress
Status in neutron kilo series:
New
Status in OpenStack Security Advisories:
Confirmed
Bug description:
If any tenant creates a subnet with a netmask of 31 or 32 in IPv4,
IP addresses of network will fail to be generated, and that
will cause constant resyncs and neutron-dhcp-agent malfunction.
[Example operation 1]
- Create subnet from CLI, with CIDR /31 (CIDR /32 has the same result).
$ neutron subnet-create net 192.168.0.0/31 --name sub
Created a new subnet:
+-------------------+--------------------------------------+
| Field | Value |
+-------------------+--------------------------------------+
| allocation_pools | |
| cidr | 192.168.0.0/31 |
| dns_nameservers | |
| enable_dhcp | True |
| gateway_ip | 192.168.0.1 |
| host_routes | |
| id | 42a91f59-1c2d-4e33-9033-4691069c5e4b |
| ip_version | 4 |
| ipv6_address_mode | |
| ipv6_ra_mode | |
| name | sub |
| network_id | 65cc6b46-17ec-41a8-9fe4-5bf93fc25d1e |
| subnetpool_id | |
| tenant_id | 4ffb89e718d346b48fdce2ac61537bce |
+-------------------+--------------------------------------+
[Example operation 2]
- Create subnet from API, with cidr /32 (CIDR /31 has the same result).
$ curl -i -X POST -H "content-type:application/json" -d '{"subnet": { "name":
"badsub", "cidr" : "192.168.0.0/32", "ip_version": 4, "network_id": "8
8143cda-5fe7-45b6-9245-b1e8b75d28d8"}}' -H "x-auth-token:$TOKEN"
http://192.168.122.130:9696/v2.0/subnets
HTTP/1.1 201 Created
Content-Type: application/json; charset=UTF-8
Content-Length: 410
X-Openstack-Request-Id: req-4e7e74c0-0190-4a69-a9eb-93d545e8aeef
Date: Thu, 16 Apr 2015 19:21:20 GMT
{"subnet": {"name": "badsub", "enable_dhcp": true, "network_id":
"88143cda-5fe7-45b6-9245-b1e8b75d28d8", "tenant_id":
"4ffb89e718d346b48fdce2ac61537bce", "dns_nameservers": [],
"gateway_ip": "192.168.0.1", "ipv6_ra_mode": null, "allocation_pools":
[], "host_routes": [], "ip_version": 4, "ipv6_address_mode": null,
"cidr": "192.168.0.0/32", "id": "d210d5fd-8b3b-4c0e-b5ad-
41798bd47d97", "subnetpool_id": null}}
[Example operation 3]
- Create subnet from API, with empty allocation_pools.
$ curl -i -X POST -H "content-type:application/json" -d '{"subnet": { "name":
"badsub", "cidr" : "192.168.0.0/24", "allocation_pools": [], "ip_version": 4,
"network_id": "88143cda-5fe7-45b6-9245-b1e8b75d28d8"}}' -H
"x-auth-token:$TOKEN" http://192.168.122.130:9696/v2.0/subnets
HTTP/1.1 201 Created
Content-Type: application/json; charset=UTF-8
Content-Length: 410
X-Openstack-Request-Id: req-54ce81db-b586-4887-b60b-8776a2ebdb4e
Date: Thu, 16 Apr 2015 19:18:21 GMT
{"subnet": {"name": "badsub", "enable_dhcp": true, "network_id":
"88143cda-5fe7-45b6-9245-b1e8b75d28d8", "tenant_id":
"4ffb89e718d346b48fdce2ac61537bce", "dns_nameservers": [],
"gateway_ip": "192.168.0.1", "ipv6_ra_mode": null, "allocation_pools":
[], "host_routes": [], "ip_version": 4, "ipv6_address_mode": null,
"cidr": "192.168.0.0/24", "id": "abc2dca4-bf8b-46f5-af1a-
0a1049309854", "subnetpool_id": null}}
[Trace log]
2015-04-17 04:23:27.907 16641 DEBUG oslo_messaging._drivers.amqp [-]
UNIQUE_ID is e0a6a81a005d4aa0b40130506afa0267. _add_unique_id
/usr/local/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqp.py:258
2015-04-17 04:23:27.979 16641 ERROR neutron.agent.dhcp.agent [-] Unable to
enable dhcp for 88143cda-5fe7-45b6-9245-b1e8b75d28d8.
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent Traceback (most
recent call last):
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent File
"/opt/stack/neutron/neutron/agent/dhcp/agent.py", line 112, in call_driver
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent
getattr(driver, action)(**action_kwargs)
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent File
"/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 201, in enable
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent
interface_name = self.device_manager.setup(self.network)
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent File
"/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 928, in setup
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent port =
self.setup_dhcp_port(network)
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent File
"/opt/stack/neutron/neutron/agent/linux/dhcp.py", line 909, in setup_dhcp_port
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent dhcp_port =
self.plugin.create_dhcp_port({'port': port_dict})
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent File
"/opt/stack/neutron/neutron/agent/dhcp/agent.py", line 433, in create_dhcp_port
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent port=port,
host=self.host)
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent File
"/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/client.py", line
156, in call
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent
retry=self.retry)
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent File
"/usr/local/lib/python2.7/dist-packages/oslo_messaging/transport.py", line 90,
in _send
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent
timeout=timeout, retry=retry)
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent File
"/usr/local/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py",
line 350, in send
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent retry=retry)
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent File
"/usr/local/lib/python2.7/dist-packages/oslo_messaging/_drivers/amqpdriver.py",
line 341, in _send
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent raise result
2015-04-17 04:23:27.979 16641 TRACE neutron.agent.dhcp.agent RemoteError:
Remote error: IpAddressGenerationFailure No more IP addresses available on
network 88143cda-5fe7-45b6-9245-b1e8b75d28d8.
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