net: support Linux vsock sockets

[waldiTM]

Proposal Details

There exists basic support for AF_VSOCK sockets implemented in #19434.

Could support for such sockets please be added to the net module? For example net.FileListener can operate on TCP and UNIX sockets, but fails on vsock sockets.

[ianlancetaylor]

What API would need to be added to the net package? Thanks.

[waldiTM]

Sorry, I can't answer this. I don't know enough about how this should work.

I see separate implementations of sockaddr structs in syscall and x/sys/unix. So I assume right now, it would need the ones from syscall?

This means:

• src/syscall/types_linux.go: map struct sockaddr_vm to RawSockaddrVM
• src/syscall/syscall_unix.go (or _linux.go?): add SockaddrVM struct
• src/syscall/syscall_linux.go: implement AF_VSOCK support in anyToSockaddr function.
• src/net/file_unix.go: implement support in newFileFD and fileListener
• src/net/vmlistener.go: implement a separate listener for vsock connection

Problem I see: vsock is linux specific, the net package code is unix specific.

[ianlancetaylor]

Thanks. The way the proposal process is intended to work is that people work out the details of how the libraries should change and open a proposal for that. It doesn't work to ask us to figure things out--we don't know what you need. I'm going to take this out of the proposal process. Perhaps interested parties can work out the API changes, and then we can open a proposal for that.