Chaining with Cilium CNI returns a nil interface

[mazzy89]

This is my CNI conf

{
  "name": "cilium",
  "cniVersion": "0.3.1",
  "plugins": [
    {
      "type": "cilium-cni",
      "enable-debug": false
    },
    {
      "type": "tc-redirect-tap"
    }
  ]
}

Cilium here handles the IPAM.

I cannot run Firecracker because I get the error:

expected to find 1 IP on redirect interface "eth0", but instead found []

I bit of debug of the plugin and I get this result into the tc-redirect-tap func here

tc-redirect-tap/internal/cniutil.go

Line 25 in a030097

func InterfaceIPs(result *current.Result, ifaceName string, sandbox string) []*current.IPConfig {

CNI Result: Interfaces:[{Name:eth0 Mac:c6:28:3f:e7:71:34 Sandbox:/var/run/netns/05673121-d177-11ea-b4db-005056848dc3}], IP:[{Version:4 Interface:<nil> Address:{IP:10.14.199.37 Mask:ffffffff} Gateway:10.14.24.19}], Routes:[{Dst:{IP:10.14.24.19 Mask:ffffffff} GW:<nil>} {Dst:{IP:0.0.0.0 Mask:00000000} GW:10.14.24.19}], DNS:{Nameservers:[] Domain: Search:[] Options:[]}

The function InterfaceIPs then cannot find any IPs because it checks under IP if the Interface is different than nil but in my case, it is nil, and then it fails.

Not sure if it is a bug of Cilium or we could move the check somewhere else.

[mazzy89]

I've talked with Cilium guys and they confirmed that the Interface is not there and I should add there. So going to wire a PR into Cilium to tackle this down.

[mazzy89]

I've wired a PR on Cilium CNI to help with this https://github.com/cilium/cilium/pull/12706/files

[mazzy89]

The PR has been merged. I'll test it once again when a new release will be crafted.