Add support for xt_bpf kernel module

[cowwoc]

Is your feature request related to a problem? Please describe.
Docker Desktop for Windows needs the xt_bpf kernel module, for security reasons: #10029 (comment)

Describe the solution you'd like
Add support for the xt_bpf kernel module

Describe alternatives you've considered
Use unencrypted networks, but this is a security risk.

Additional context
Please prevent the stalebot from closing this issue.

[github-actions]

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.\collect-wsl-logs.ps1

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View similar issues

Please view the issues below to see if they solve your problem, and if the issue describes your problem please consider closing this one and thumbs upping the other issue to help us prioritize it!

Open similar issues:

• Add xt_recent kernel module so that Kubernetes Services with Session Affinity work in WSL (#11159), similarity score: 0.74

Closed similar issues:

• Include module nf_conntrack in WSL2 kernel (#8149), similarity score: 0.71

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[cowwoc]

Logs are not relevant for this feature request.

[sirredbeard]

It appears from commit history of WSL kernel developers that xt_u32 and xt_bpf are in the works as loadable modules in the 6.x WSL kernel series, but they have not yet been committed to the main 6.x WSL kernel branches.

I would recommend, in the interim, to build a custom 6.x kernel, with those modules.

There is an official guide using Ubuntu here.

I also publish a distro-agnostic guide for building the WSL kernel, not specific for 6, but if you grab the 6.6.y release in lieu of the command that grabs the most recent stable release (still 5.x), it will work.

In my guide, instead of the command: curl -k -s https://api.github.com/repos/microsoft/WSL2-Linux-Kernel/releases/latest ... install git and use git clone https://github.com/microsoft/WSL2-Linux-Kernel.git --depth=1 -b linux-msft-wsl-6.6.y.

You will need to modify the wsl-config with:

CONFIG_NETFILTER_XT_MATCH_BPF=m
CONFIG_NETFILTER_XT_MATCH_U32=m

either manually or using the kernel config TUI.