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From: Ard Biesheuvel <ardb@kernel.org>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Eric Dumazet <eric.dumazet@gmail.com>,
	Eric Biggers <ebiggers@kernel.org>,
	Leonard Crestez <cdleonard@gmail.com>,
	Dmitry Safonov <0x7f454c46@gmail.com>,
	David Ahern <dsahern@kernel.org>, Shuah Khan <shuah@kernel.org>,
	Eric Dumazet <edumazet@google.com>,
	"David S. Miller" <davem@davemloft.net>,
	Kuniyuki Iwashima <kuniyu@amazon.co.jp>,
	Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
	Jakub Kicinski <kuba@kernel.org>,
	Yuchung Cheng <ycheng@google.com>,
	Francesco Ruggeri <fruggeri@arista.com>,
	Mat Martineau <mathew.j.martineau@linux.intel.com>,
	Christoph Paasch <cpaasch@apple.com>,
	Ivan Delalande <colona@arista.com>,
	Priyaranjan Jha <priyarjha@google.com>,
	Menglong Dong <dong.menglong@zte.com.cn>,
	"open list:BPF JIT for MIPS (32-BIT AND 64-BIT)" 
	<netdev@vger.kernel.org>,
	Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
	"open list:KERNEL SELFTEST FRAMEWORK" 
	<linux-kselftest@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [RFCv3 05/15] tcp: authopt: Add crypto initialization
Date: Wed, 25 Aug 2021 18:04:46 +0200	[thread overview]
Message-ID: <CAMj1kXE_sDZJjmkoqHcLz=9fDqLPBNbyfH4zxN2s2RdgKO=eSw@mail.gmail.com> (raw)
In-Reply-To: <20210825080817.GA19149@gondor.apana.org.au>

On Wed, 25 Aug 2021 at 10:08, Herbert Xu <herbert@gondor.apana.org.au> wrote:
>
> On Tue, Aug 24, 2021 at 04:34:58PM -0700, Eric Dumazet wrote:
> >
> > On 8/24/21 2:34 PM, Leonard Crestez wrote:
> > > The crypto_shash API is used in order to compute packet signatures. The
> > > API comes with several unfortunate limitations:
> > >
> > > 1) Allocating a crypto_shash can sleep and must be done in user context.
> > > 2) Packet signatures must be computed in softirq context
> > > 3) Packet signatures use dynamic "traffic keys" which require exclusive
> > > access to crypto_shash for crypto_setkey.
> > >
> > > The solution is to allocate one crypto_shash for each possible cpu for
> > > each algorithm at setsockopt time. The per-cpu tfm is then borrowed from
> > > softirq context, signatures are computed and the tfm is returned.
> > >
> >
> > I could not see the per-cpu stuff that you mention in the changelog.
>
> Perhaps it's time we moved the key information from the tfm into
> the request structure for hashes? Or at least provide a way for
> the key to be in the request structure in addition to the tfm as
> the tfm model still works for IPsec.  Ard/Eric, what do you think
> about that?
>

I think it makes sense for a shash desc to have the ability to carry a
key, which will be used instead of the TFM key, but this seems like
quite a lot of work, given that all implementations will need to be
updated. Also, setkey() can currently sleep, so we need to check
whether the existing key manipulation code can actually execute during
init/update/final if sleeping is not permitted.

  parent reply	other threads:[~2021-08-25 16:05 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-24 21:34 [RFCv3 00/15] tcp: Initial support for RFC5925 auth option Leonard Crestez
2021-08-24 21:34 ` [RFCv3 01/15] tcp: authopt: Initial support and key management Leonard Crestez
2021-08-31 19:04   ` Dmitry Safonov
2021-09-03 14:26     ` Leonard Crestez
2021-08-24 21:34 ` [RFCv3 02/15] docs: Add user documentation for tcp_authopt Leonard Crestez
2021-08-24 21:34 ` [RFCv3 03/15] selftests: Initial tcp_authopt test module Leonard Crestez
2021-08-24 21:34 ` [RFCv3 04/15] selftests: tcp_authopt: Initial sockopt manipulation Leonard Crestez
2021-08-24 21:34 ` [RFCv3 05/15] tcp: authopt: Add crypto initialization Leonard Crestez
2021-08-24 23:02   ` Eric Dumazet
2021-08-24 23:34   ` Eric Dumazet
2021-08-25  8:08     ` Herbert Xu
2021-08-25 14:55       ` Eric Dumazet
2021-08-25 16:04       ` Ard Biesheuvel [this message]
2021-08-25 16:31         ` Leonard Crestez
2021-08-25 16:35     ` Leonard Crestez
2021-08-25 17:55       ` Eric Dumazet
2021-08-25 18:56         ` Leonard Crestez
2021-08-24 21:34 ` [RFCv3 06/15] tcp: authopt: Compute packet signatures Leonard Crestez
2021-08-24 21:34 ` [RFCv3 07/15] tcp: authopt: Hook into tcp core Leonard Crestez
2021-08-24 22:59   ` Eric Dumazet
2021-08-25 16:32     ` Leonard Crestez
2021-08-24 21:34 ` [RFCv3 08/15] tcp: authopt: Add snmp counters Leonard Crestez
2021-08-24 21:34 ` [RFCv3 09/15] selftests: tcp_authopt: Test key address binding Leonard Crestez
2021-08-25  5:18   ` David Ahern
2021-08-25 16:37     ` Leonard Crestez
2021-08-24 21:34 ` [RFCv3 10/15] selftests: tcp_authopt: Capture and verify packets Leonard Crestez
2021-08-24 21:34 ` [RFCv3 11/15] selftests: Initial tcp_authopt support for nettest Leonard Crestez
2021-08-24 21:34 ` [RFCv3 12/15] selftests: Initial tcp_authopt support for fcnal-test Leonard Crestez
2021-08-24 21:34 ` [RFCv3 13/15] selftests: Add -t tcp_authopt option for fcnal-test.sh Leonard Crestez
2021-08-24 21:34 ` [RFCv3 14/15] tcp: authopt: Add key selection controls Leonard Crestez
2021-08-24 21:34 ` [RFCv3 15/15] selftests: tcp_authopt: Add tests for rollover Leonard Crestez

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