ec2_vpc_route_table should support IPv6 routes

[vonschultz]

Summary

When trying to add e.g. the default route for IPv6, ::/0, it complains that's not a valid CIDR. When IPv6 routes are already in place, it produces warnings saying

[WARNING]: Skipping purging route {'DestinationIpv6CidrBlock': '::/0', 'GatewayId': 'igw-0cf0f83e528bb6fe2', 'Origin': 'CreateRoute', 'State': 'active'} because it has no destination cidr block. To remove VPC endpoints from route tables use the ec2_vpc_endpoint module.

community.aws.ec2_vpc_route_table should support IPv6 routes, and gracefully handle any IPv6 routes that are already there.

Issue Type

Feature Idea

Component Name

ec2_vpc_route_table

Additional Information

No response

Code of Conduct

• I agree to follow the Ansible Code of Conduct

[tremble]

Hi @vonschultz,

Thanks for taking the time to raise this issue. IPv6 support was added by #601 and should be available with release 3.1.0 of amazon.aws.

[ansibullbot]

Files identified in the description:

• [plugins/modules/ec2_vpc_route_table.py](https://github.com/['ansible-collections/amazon.aws', 'ansible-collections/community.aws', 'ansible-collections/community.vmware']/blob/main/plugins/modules/ec2_vpc_route_table.py)

If these files are inaccurate, please update the component name section of the description or use the !component bot command.

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[ansibullbot]

cc @jillr @s-hertel @willthames
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[vonschultz]

Ah, nice!

[vonschultz]

I've now upgraded to amazon.aws release 5.2.0, and the warning is still produced, though it no longer refers to ::/0. The warning I get is

[WARNING]: Skipping purging route {'DestinationIpv6CidrBlock': '2a05:d016:e04:a400::/56', 'GatewayId': 'local', 'Origin': 'CreateRouteTable', 'State': 'active'} because it has no destination cidr block. To remove VPC endpoints from route tables use the ec2_vpc_endpoint module.

I see the corresponding code in main, https://github.com/ansible-collections/amazon.aws/blob/main/plugins/modules/ec2_vpc_route_table.py, function ensure_routes(), the if purge_routes branch.

I'm fine with skipping purging this route, as the GatewayId is local and the DestinationIpv6CidrBlock is the CIDR block of the VPC itself, but the warning is strange, since there is a destination CIDR block, and this is entirely unrelated to VPC endpoints.