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[Bug 1330826] [NEW] Neutron network:dhcp port is not assigned EUI64 IPv6 address

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Public bug reported:

In a provider network setup with an IPv6 subnet configured for SLAAC,
Neutron assigns IPv6 addresses to the VMs based on EUI64 but dhcp ports
seems to use the regular allocation method.

Steps to reproduce:
#As an admin user, create a provider network and associate an IPv4 and IPv6 subnet.
cd ~/devstack
source openrc admin admin
neutron net-create N-ProviderNet --provider:physical_network=ipv6-net --provider:network_type=flat --shared
neutron subnet-create --name N-ProviderSubnet N-ProviderNet 20.1.1.0/24  --gateway 20.1.1.1 --allocation-pool start=20.1.1.100,end=20.1.1.150
neutron subnet-create --name N-ProviderSubnetIPv6 --ip_version 6 --ipv6-address-mode slaac --gateway fe80::689d:41ff:fe20:44ca N-ProviderNet 2001:1:2:3::/64

As a normal tenant, launch a VM with the provider net-id. You could see
that ipAddress assigned to dhcp port is "2001:1:2:3::1" which is not an
EUI64 based address.

sridhar@ControllerNode:~/devstack$ neutron port-list -F mac_address -F fixed_ips
+-------------------+-------------------------------------------------------------------------------------------------------+
| mac_address       | fixed_ips                                                                                             |
+-------------------+-------------------------------------------------------------------------------------------------------+
| fa:16:3e:6a:db:6f | {"subnet_id": "61d2661d-22a0-449c-8823-b4d781515f66", "ip_address": "172.24.4.2"}                     |
| fa:16:3e:54:56:13 | {"subnet_id": "3e3487de-036c-4ab7-ba3f-c6b5db041fb2", "ip_address": "20.1.1.101"}                     |
|                   | {"subnet_id": "716234df-1f46-434c-be48-d976a86438d6", "ip_address": "2001:1:2:3::1"}                  |
| fa:16:3e:dd:e9:82 | {"subnet_id": "61d2661d-22a0-449c-8823-b4d781515f66", "ip_address": "172.24.4.4"}                     |
| fa:16:3e:52:1f:43 | {"subnet_id": "fbad7350-83c4-4cad-aa95-fecac232cea1", "ip_address": "10.0.0.101"}                     |
| fa:16:3e:8a:f0:b6 | {"subnet_id": "61d2661d-22a0-449c-8823-b4d781515f66", "ip_address": "172.24.4.3"}                     |
| fa:16:3e:02:d2:50 | {"subnet_id": "fbad7350-83c4-4cad-aa95-fecac232cea1", "ip_address": "10.0.0.1"}                       |
| fa:16:3e:45:5c:00 | {"subnet_id": "3e3487de-036c-4ab7-ba3f-c6b5db041fb2", "ip_address": "20.1.1.102"}                     |
|                   | {"subnet_id": "716234df-1f46-434c-be48-d976a86438d6", "ip_address": "2001:1:2:3:f816:3eff:fe45:5c00"} |
+-------------------+-------------------------------------------------------------------------------------------------------+

sridhar@ControllerNode:~/devstack$ sudo ip netns exec qdhcp-93093763-bc7d-4be4-91ad-0ef9ba69273c ifconfig
tap4828cfbd-fe Link encap:Ethernet  HWaddr fa:16:3e:54:56:13  
          inet addr:20.1.1.101  Bcast:20.1.1.255  Mask:255.255.255.0
          inet6 addr: 2001:1:2:3:f816:3eff:fe54:5613/64 Scope:Global
          inet6 addr: 2001:1:2:3::1/64 Scope:Global
          inet6 addr: fe80::f816:3eff:fe54:5613/64 Scope:Link
          UP BROADCAST RUNNING  MTU:1500  Metric:1
          RX packets:337 errors:0 dropped:0 overruns:0 frame:0
          TX packets:34 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:37048 (37.0 KB)  TX bytes:3936 (3.9 KB)

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1330826

Title:
  Neutron network:dhcp port is not assigned EUI64 IPv6 address

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  In a provider network setup with an IPv6 subnet configured for SLAAC,
  Neutron assigns IPv6 addresses to the VMs based on EUI64 but dhcp
  ports seems to use the regular allocation method.

  Steps to reproduce:
  #As an admin user, create a provider network and associate an IPv4 and IPv6 subnet.
  cd ~/devstack
  source openrc admin admin
  neutron net-create N-ProviderNet --provider:physical_network=ipv6-net --provider:network_type=flat --shared
  neutron subnet-create --name N-ProviderSubnet N-ProviderNet 20.1.1.0/24  --gateway 20.1.1.1 --allocation-pool start=20.1.1.100,end=20.1.1.150
  neutron subnet-create --name N-ProviderSubnetIPv6 --ip_version 6 --ipv6-address-mode slaac --gateway fe80::689d:41ff:fe20:44ca N-ProviderNet 2001:1:2:3::/64

  As a normal tenant, launch a VM with the provider net-id. You could
  see that ipAddress assigned to dhcp port is "2001:1:2:3::1" which is
  not an EUI64 based address.

  sridhar@ControllerNode:~/devstack$ neutron port-list -F mac_address -F fixed_ips
  +-------------------+-------------------------------------------------------------------------------------------------------+
  | mac_address       | fixed_ips                                                                                             |
  +-------------------+-------------------------------------------------------------------------------------------------------+
  | fa:16:3e:6a:db:6f | {"subnet_id": "61d2661d-22a0-449c-8823-b4d781515f66", "ip_address": "172.24.4.2"}                     |
  | fa:16:3e:54:56:13 | {"subnet_id": "3e3487de-036c-4ab7-ba3f-c6b5db041fb2", "ip_address": "20.1.1.101"}                     |
  |                   | {"subnet_id": "716234df-1f46-434c-be48-d976a86438d6", "ip_address": "2001:1:2:3::1"}                  |
  | fa:16:3e:dd:e9:82 | {"subnet_id": "61d2661d-22a0-449c-8823-b4d781515f66", "ip_address": "172.24.4.4"}                     |
  | fa:16:3e:52:1f:43 | {"subnet_id": "fbad7350-83c4-4cad-aa95-fecac232cea1", "ip_address": "10.0.0.101"}                     |
  | fa:16:3e:8a:f0:b6 | {"subnet_id": "61d2661d-22a0-449c-8823-b4d781515f66", "ip_address": "172.24.4.3"}                     |
  | fa:16:3e:02:d2:50 | {"subnet_id": "fbad7350-83c4-4cad-aa95-fecac232cea1", "ip_address": "10.0.0.1"}                       |
  | fa:16:3e:45:5c:00 | {"subnet_id": "3e3487de-036c-4ab7-ba3f-c6b5db041fb2", "ip_address": "20.1.1.102"}                     |
  |                   | {"subnet_id": "716234df-1f46-434c-be48-d976a86438d6", "ip_address": "2001:1:2:3:f816:3eff:fe45:5c00"} |
  +-------------------+-------------------------------------------------------------------------------------------------------+

  sridhar@ControllerNode:~/devstack$ sudo ip netns exec qdhcp-93093763-bc7d-4be4-91ad-0ef9ba69273c ifconfig
  tap4828cfbd-fe Link encap:Ethernet  HWaddr fa:16:3e:54:56:13  
            inet addr:20.1.1.101  Bcast:20.1.1.255  Mask:255.255.255.0
            inet6 addr: 2001:1:2:3:f816:3eff:fe54:5613/64 Scope:Global
            inet6 addr: 2001:1:2:3::1/64 Scope:Global
            inet6 addr: fe80::f816:3eff:fe54:5613/64 Scope:Link
            UP BROADCAST RUNNING  MTU:1500  Metric:1
            RX packets:337 errors:0 dropped:0 overruns:0 frame:0
            TX packets:34 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:0 
            RX bytes:37048 (37.0 KB)  TX bytes:3936 (3.9 KB)

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