The CNI spec states that for DEL implementations, "when CNI_NETNS and/or
prevResult are not provided, the plugin should clean up as many resources as
possible (e.g. releasing IPAM allocations) and return a successful response".
This change results in the firewall plugin conforming to the spec by not
returning an error whenever the del method is not provided a prevResult.
Signed-off-by: Erik Sipsma <sipsma@amazon.com>
Now that libcni has the ability to print a version message, plumb it
through correctly.
While we're at it,
- fix import paths
- run gofmt
- add some more comments to sample
- add container runtime swappability for release
Example of usage, which uses flannel for allocating IP
addresses for containers and then registers them in `trusted`
zone in firewalld:
{
"cniVersion": "0.3.1",
"name": "flannel-firewalld",
"plugins": [
{
"name": "cbr0",
"type": "flannel",
"delegate": {
"isDefaultGateway": true
}
},
{
"type": "firewall",
"backend": "firewalld",
"zone": "trusted"
}
]
}
Fixes #114
Signed-off-by: Alban Crequy <alban@kinvolk.io>
Signed-off-by: Michal Rostecki <mrostecki@suse.com>
Distros often have additional rules in the their iptabvles 'filter' table
that do things like:
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
docker, for example, gets around this by adding explicit rules to the filter
table's FORWARD chain to allow traffic from the docker0 interface. Do that
for a given host interface too, as a chained plugin.
