`ip route del default` fails with "RTNETLINK answers: Operation not supported" (gVisor release-20240610.0)

[avizack18]

Description

I'm encountering an error when trying to delete the default route using ip route del default in gVisor version release-20240610.0. The command returns the following message:

RTNETLINK answers: Operation not supported

Steps to reproduce

1. Install gVisor version release-20240610.0.
2. Attempt to delete or add the default route using:

   ip route del default
   ip route add default via 192.168.4.90
   

3. Observe the "RTNETLINK answers: Operation not supported" error message.

runsc version

runsc version release-20240610.0
spec: 1.1.0-rc.1

docker version (if using docker)

24.0.5

uname

5.15.0-112

kubectl (if using Kubernetes)

No response

repo state (if built from source)

No response

runsc debug logs (if available)

No response

[milantracy]

thanks!

it has been the known issue, both netlink RTM_NEWROTE and RTM_DELROUTE are not supported.

I have been working on RTM_NEWROUTE, a PR could be found at https://github.com/google/gvisor/pull/10539

Please feel free to create a PR if you have anything on RTM_DELROUTE, otherwise, I will work on it after RTM_DELROUTE

[milantracy]

RTM_DELROUTE should be working with the netstack now w/ the commit https://github.com/google/gvisor/commit/f681bcc095fb168ae26f9af44004e4e67993a393