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[Li Zhouzhou <1835344@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

neutron doesn't check the validity of gateway_ip as a subnet had been created.
Then we attach interface into a router for this subnet, the neutron-server will report a error, like: "IP address 10.10.13.254 is not a valid IP for the specified subnet."

How to reproduce:
1. create a subnet, specify the gateway_ip which isn't in the cidr range.
# neutron subnet-create  --name xxxx-subnet12 --gateway 10.10.13.254 xxx-net1 10.10.13.0/25

2. create a router:
# neutron router-create xxx-router1

3. attach interface into a router for this subnet.
# neutron router-interface-add xxx-router1 xxx-subnet123

result:
expected: success
real: unsuccessful, "IP address 10.10.13.254 is not a valid IP for the specified subnet."

Improve:
So, I think we should check the validity of gateway_ip for subnet when create a subnet.


tests:
[root@xxxx]#  neutron subnet-create  --name xxx-subnet12 --gateway 10.10.13.254 xxx-pool-net1 10.10.13.0/25
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
Created a new subnet:
+---------------------+------------------------------------------------+
| Field               | Value                                          |
+---------------------+------------------------------------------------+
| allocation_pools    | {"start": "10.10.13.1", "end": "10.10.13.126"} |
| available_ip_number | 126                                            |
| available_ips       | {"start": "10.10.13.1", "end": "10.10.13.126"} |
| cidr                | 10.10.13.0/25                                  |
| created_at          | 2019-07-04T02:37:07Z                           |
| description         |                                                |
| dns_nameservers     |                                                |
| enable_dhcp         | True                                           |
| gateway_ip          | 10.10.13.254                                   |
| host_routes         |                                                |
| id                  | 16dc9a28-f4d2-4b1e-9922-d78b4453147a           |
| ip_version          | 4                                              |
| ipv6_address_mode   |                                                |
| ipv6_ra_mode        |                                                |
| name                | xxx-subnet12                                |
| network_id          | 2fa614ec-8532-46a4-a23a-d599d1c1aaf8           |
| project_id          | f0208ec2708e436fa02bb79bb3851f86               |
| revision_number     | 0                                              |
| service_types       |                                                |
| subnetpool_id       |                                                |
| tags                |                                                |
| tenant_id           | f0208ec2708e436fa02bb79bb3851f86               |
| updated_at          | 2019-07-04T02:37:07Z                           |
+---------------------+------------------------------------------------+
[root@xxx]#  neutron router-interface-add xxx-router123 xxx-subnet12
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
IP address 10.10.13.254 is not a valid IP for the specified subnet.
Neutron server returns request_ids: ['req-c58bab6f-2152-4cd5-8cbd-e6f8cb7052ed']

** Affects: neutron
     Importance: Undecided
     Assignee: Li Zhouzhou (lizhouzhou)
         Status: In Progress

** Changed in: neutron
     Assignee: (unassigned) => Li Zhouzhou (lizhouzhou)

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https://bugs.launchpad.net/bugs/1835344

Title:
  neutron doesn't check the validity of gateway_ip as a subnet had been
  created

Status in neutron:
  In Progress

Bug description:
  neutron doesn't check the validity of gateway_ip as a subnet had been created.
  Then we attach interface into a router for this subnet, the neutron-server will report a error, like: "IP address 10.10.13.254 is not a valid IP for the specified subnet."

  How to reproduce:
  1. create a subnet, specify the gateway_ip which isn't in the cidr range.
  # neutron subnet-create  --name xxxx-subnet12 --gateway 10.10.13.254 xxx-net1 10.10.13.0/25

  2. create a router:
  # neutron router-create xxx-router1

  3. attach interface into a router for this subnet.
  # neutron router-interface-add xxx-router1 xxx-subnet123

  result:
  expected: success
  real: unsuccessful, "IP address 10.10.13.254 is not a valid IP for the specified subnet."

  Improve:
  So, I think we should check the validity of gateway_ip for subnet when create a subnet.

  
  tests:
  [root@xxxx]#  neutron subnet-create  --name xxx-subnet12 --gateway 10.10.13.254 xxx-pool-net1 10.10.13.0/25
  neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
  Created a new subnet:
  +---------------------+------------------------------------------------+
  | Field               | Value                                          |
  +---------------------+------------------------------------------------+
  | allocation_pools    | {"start": "10.10.13.1", "end": "10.10.13.126"} |
  | available_ip_number | 126                                            |
  | available_ips       | {"start": "10.10.13.1", "end": "10.10.13.126"} |
  | cidr                | 10.10.13.0/25                                  |
  | created_at          | 2019-07-04T02:37:07Z                           |
  | description         |                                                |
  | dns_nameservers     |                                                |
  | enable_dhcp         | True                                           |
  | gateway_ip          | 10.10.13.254                                   |
  | host_routes         |                                                |
  | id                  | 16dc9a28-f4d2-4b1e-9922-d78b4453147a           |
  | ip_version          | 4                                              |
  | ipv6_address_mode   |                                                |
  | ipv6_ra_mode        |                                                |
  | name                | xxx-subnet12                                |
  | network_id          | 2fa614ec-8532-46a4-a23a-d599d1c1aaf8           |
  | project_id          | f0208ec2708e436fa02bb79bb3851f86               |
  | revision_number     | 0                                              |
  | service_types       |                                                |
  | subnetpool_id       |                                                |
  | tags                |                                                |
  | tenant_id           | f0208ec2708e436fa02bb79bb3851f86               |
  | updated_at          | 2019-07-04T02:37:07Z                           |
  +---------------------+------------------------------------------------+
  [root@xxx]#  neutron router-interface-add xxx-router123 xxx-subnet12
  neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
  IP address 10.10.13.254 is not a valid IP for the specified subnet.
  Neutron server returns request_ids: ['req-c58bab6f-2152-4cd5-8cbd-e6f8cb7052ed']

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