netdev - Re: [PATCH RFC 4/5] net/tls: Add support for PF

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Date:   Thu, 28 Apr 2022 06:30:09 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Hannes Reinecke <hare@...e.de>
Cc:     Sagi Grimberg <sagi@...mberg.me>,
        Chuck Lever <chuck.lever@...cle.com>, netdev@...r.kernel.org,
        linux-nfs@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-cifs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        ak@...pesta-tech.com, borisp@...dia.com, simo@...hat.com
Subject: Re: [PATCH RFC 4/5] net/tls: Add support for PF_TLSH (a TLS
 handshake listener)

On Thu, 28 Apr 2022 09:26:41 +0200 Hannes Reinecke wrote:
> The whole thing started off with the problem on _how_ sockets could be 
> passed between kernel and userspace and vice versa.
> While there is fd passing between processes via AF_UNIX, there is no 
> such mechanism between kernel and userspace.

Noob question - the kernel <> user space FD sharing is just 
not implemented yet, or somehow fundamentally hard because kernel 
fds are "special"?