Fix incorrect validation of port mapping #48088
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Regression introduced in 01eecb6. A port mapping from a specific IPv6 host address can be used by a container on an IPv4-only network, docker-proxy makes the connection. Signed-off-by: Rob Murray <rob.murray@docker.com>
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corhere
approved these changes
Jun 28, 2024
thaJeztah
approved these changes
Jun 28, 2024
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- What I did
In 27.0.1, #47871 added a check that no host address/port is included in a port mapping when NAT is disabled (because it'd be misleading, with no NAT the container port is opened but there's no mapping from the host).
A port mapping from a specific IPv6 host address can be used by a container on an IPv4-only network, docker-proxy makes the connection. That new validation erroneously reported an error for this situation.
- How I did it
Rather than treat a container with no IPv6 address as having no NAT6 (in
!disableNAT6 && len(containerIPv6) > 0), ignore the presence of an address. Then, in the validation function special-case a container with no IPv6 address, allowing anything in an IPv6 port mapping.- How to verify it
With an IPv4-only network,
docker run --rm -ti --network nnn -p 127.0.0.1:8080:80 -p '[::1]:8080:80' nginx.Updated unit tests, and new integration test.
- Description for the changelog