gateway_ip change event in DNAT

[Yuli]

The DNAT patch needs to handle subnet update call when gateway_ip is changed:

Here is a command to change gateway_ip

neutron subnet-update public-subnet --gateway_ip 10.200.100.1

The following rules are not changed:

 cookie=0x0, duration=6411.445s, table=15, n_packets=0, n_bytes=0, priority=100,arp,arp_spa=10.100.0.1,arp_tpa=10.100.201.200,arp_op=2 actions=CONTROLLER:65535
 cookie=0x0, duration=6411.445s, table=15, n_packets=0, n_bytes=0, priority=100,arp,arp_spa=10.100.0.1,arp_tpa=10.100.0.1,arp_op=1 actions=CONTROLLER:65535

[Yuli (stremovsky)]

df-db dump | grep 10.100.0.1
Key = 40348c8c-aae3-4831-a292-80472cfa5439 , Value = {"router_id": "e6c8cdd4-1bdc-4947-ae51-e9f81df26a45", "status": "ACTIVE", "name": "40348c8c-aae3-4831-a292-80472cfa5439", "floating_port_id": "871352b4-d1da-48b9-92b5-d141c062e877", "floating_mac_address": "fa:16:3e:42:4a:8e", "floating_network_id": "cb3f53f3-2694-4924-8b31-a7735906610c", "topic": "85104976665e47cfaefe8ad50e7de019", "fixed_ip_address": "10.0.0.3", "floating_ip_address": "10.100.201.200", "external_cidr": "10.100.0.0/16", "port_id": "91693805-d02d-4e0d-8091-1f4918cab08e", "external_gateway_ip": "10.100.0.1"}

[Yuli (stremovsky)]

------------------------------------------------------------
Table = floatingip
------------------------------------------------------------
Key = 40348c8c-aae3-4831-a292-80472cfa5439 , Value = {"router_id": "e6c8cdd4-1bdc-4947-ae51-e9f81df26a45", "status": "ACTIVE", "name": "40348c8c-aae3-4831-a292-80472cfa5439", "floating_port_id": "871352b4-d1da-48b9-92b5-d141c062e877", "floating_mac_address": "fa:16:3e:42:4a:8e", "floating_network_id": "cb3f53f3-2694-4924-8b31-a7735906610c", "topic": "85104976665e47cfaefe8ad50e7de019", "fixed_ip_address": "10.0.0.3", "floating_ip_address": "10.100.201.200", "external_cidr": "10.100.0.0/16", "port_id": "91693805-d02d-4e0d-8091-1f4918cab08e", "external_gateway_ip": "10.100.0.1"}

[Yuli (stremovsky)]

neutron floatingip-list

+--------------------------------------+------------------+---------------------+--------------------------------------+
| id | fixed_ip_address | floating_ip_address | port_id |
+--------------------------------------+------------------+---------------------+--------------------------------------+
| 40348c8c-aae3-4831-a292-80472cfa5439 | 10.0.0.3 | 10.100.201.200 | 91693805-d02d-4e0d-8091-1f4918cab08e |
+--------------------------------------+------------------+---------------------+--------------------------------------+

neutron floatingip-show 40348c8c-aae3-4831-a292-80472cfa5439
+---------------------+--------------------------------------+
| Field | Value |
+---------------------+--------------------------------------+
| description | |
| fixed_ip_address | 10.0.0.3 |
| floating_ip_address | 10.100.201.200 |
| floating_network_id | cb3f53f3-2694-4924-8b31-a7735906610c |
| id | 40348c8c-aae3-4831-a292-80472cfa5439 |
| port_id | 91693805-d02d-4e0d-8091-1f4918cab08e |
| router_id | e6c8cdd4-1bdc-4947-ae51-e9f81df26a45 |
| status | ACTIVE |
| tenant_id | 85104976665e47cfaefe8ad50e7de019 |
+---------------------+--------------------------------------+

[Yuli (stremovsky)]

    @lock_db.wrap_db_lock()
    def create_floatingip(self, context, floatingip):
............
        self.nb_api.create_floatingip(
.........
                external_gateway_ip=floatingip_subnet['gateway_ip'],

[Yuli (stremovsky)]

This bug was fixed