netdev - Re: kTLS getsockopt TLS

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Date:   Sun, 24 Feb 2019 14:31:29 +0900
From:   Hayakawa Yutaro <yhayakawa3720subscribe@...il.com>
To:     Vakul Garg <vakul.garg@....com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: kTLS getsockopt TLS_RX support


> 2019/02/24 10:50、Vakul Garg <vakul.garg@....com>のメール:
> 
> 
> 
>> -----Original Message-----
>> From: netdev-owner@...r.kernel.org <netdev-owner@...r.kernel.org> On
>> Behalf Of Hayakawa Yutaro
>> Sent: Saturday, February 23, 2019 10:59 PM
>> To: netdev@...r.kernel.org
>> Subject: kTLS getsockopt TLS_RX support
>> 
>> Hello,
>> 
>> While trying the kTLS, I found out that currently, there is no support for kTLS
>> getsockopt TLS_RX which extracts receive side crypto information from kTLS
>> socket. Since setting crypto information for RX side is supported, I felt
>> wonder why it is not supported.
>> 
>> Is there any particular reason for it?
> 
> What use case do you have in mind?
> Why give back state of record layer which also contains (record sequence number) to user space?

I’d like to checkpoint/restore the TLS session in conjunction with TCP_REPAIR.

When we checkpoint the kTLS session, we need to pick the record sequence number or
any other session information from kernel. For TX side, it is already supported (getsockopt
TLS_TX), so I’m wondering why RX side is missing.

Is there any technical difficulty or it will never supported in future?

Regards,
Yutaro

> 
>> 
>> Regards,
>> Yutaro