netdev - Re: [PATCH net-next 3/4] tls: kernel TLS support

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Message-Id: <20170526.111852.235696953256744250.davem@davemloft.net>
Date:   Fri, 26 May 2017 11:18:52 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     davejwatson@...com, ilyal@...lanox.com, aviadye@...lanox.com,
        borisp@...lanox.com, liranl@...lanox.com, matanb@...lanox.com,
        netdev@...r.kernel.org, tom@...bertland.com,
        herbert@...dor.apana.org.au, linux-crypto@...r.kernel.org,
        hannes@...essinduktion.org, alexei.starovoitov@...il.com,
        nmav@...lts.org, fridolin.pokorny@...il.com
Subject: Re: [PATCH net-next 3/4] tls: kernel TLS support

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 26 May 2017 07:16:59 -0700

> On Wed, 2017-05-24 at 09:27 -0700, Dave Watson wrote:
>> Software implementation of transport layer security, implemented using ULP
>> infrastructure.  tcp proto_ops are replaced with tls equivalents of sendmsg and
>> sendpage.
> 
> ...
> 
>> +
>> +int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
>> +{
> 	...
>> +
>> +	lock_sock(sk);
>> +
>> +	/* Only one writer at a time is allowed */
>> +	if (sk->sk_write_pending)
>> +		return -EBUSY;
> 
> Ouch...

Well, as I understand it, it is the same restriction userspace must
itself enforce either in the application or in the SSL library.