Use sock_diag instead of procfs for new address families?

[Stefan Hajnoczi]

I am implementing userspace access to socket information for AF_VSOCK.
A few hours into writing and testing a /proc/net/vsock seq_file I
noticed that ss(8) prefers NETLINK_SOCK_DIAG over procfs.

Before potentially wasting time implementing a legacy interface that
won't be accepted, I thought it might be good to ask :).

Which approach is preferred?
1. New address families must implement only sock_diag.
2. Both sock_diag and procfs must be implemented.
3. Implement whichever interface you prefer.

Thanks,
Stefan

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