netdev - Re: [PATCH v3 net-next 0/4] kernel TLS

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Date:   Wed, 14 Jun 2017 13:54:31 -0700
From:   Tom Herbert <tom@...bertland.com>
To:     Dave Watson <davejwatson@...com>
Cc:     Ilya Lesokhin <ilyal@...lanox.com>,
        Aviad Yehezkel <aviadye@...lanox.com>,
        Boris Pismenny <borisp@...lanox.com>,
        Liran Liss <liranl@...lanox.com>,
        Matan Barak <matanb@...lanox.com>,
        David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        nmav@...tls.org,
        Fridolín Pokorný <fridolin.pokorny@...il.com>
Subject: Re: [PATCH v3 net-next 0/4] kernel TLS

On Wed, Jun 14, 2017 at 11:36 AM, Dave Watson <davejwatson@...com> wrote:
> This series adds support for kernel TLS encryption over TCP sockets.
> A standard TCP socket is converted to a TLS socket using a setsockopt.
> Only symmetric crypto is done in the kernel, as well as TLS record
> framing.  The handshake remains in userspace, and the negotiated
> cipher keys/iv are provided to the TCP socket.
>
I don't see support for TLS receive path in the kernel, only the send
path. Am I missing something?

Thanks,
Tom

> We implemented support for this API in OpenSSL 1.1.0, the code is
> available at https://github.com/Mellanox/tls-openssl/tree/master
>
> It should work with any TLS library with similar modifications,
> a test tool using gnutls is here: https://github.com/Mellanox/tls-af_ktls_tool
>
> RFC patch to openssl:
> https://mta.openssl.org/pipermail/openssl-dev/2017-June/009384.html
>
> Changes from V2:
>
> * EXPORT_SYMBOL_GPL in patch 1
> * Ensure cleanup code always called before sk_stream_kill_queues to
>   avoid warnings
>
> Changes from V1:
>
> * EXPORT_SYMBOL GPL in patch 2
> * Add link to OpenSSL patch & gnutls example in documentation patch.
> * sk_write_pending check was rolled in to wait_for_memory path,
>   avoids special case and fixes lock inbalance issue.
> * Unify flag handling for sendmsg/sendfile
>
> Changes from RFC V2:
>
> * Generic ULP (upper layer protocol) framework instead of TLS specific
>   setsockopts
> * Dropped Mellanox hardware patches, will come as separate series.
>   Framework will work for both.
>
> RFC V2:
>
> http://www.mail-archive.com/netdev@vger.kernel.org/msg160317.html
>
> Changes from RFC V1:
>
> * Socket based on changing TCP proto_ops instead of crypto framework
> * Merged code with Mellanox's hardware tls offload
> * Zerocopy sendmsg support added - sendpage/sendfile is no longer
>   necessary for zerocopy optimization
>
> RFC V1:
>
> http://www.mail-archive.com/netdev@vger.kernel.org/msg88021.html
>
> * Socket based on crypto userspace API framework, required two
>   sockets in userspace, one encrypted, one unencrypted.
>
> Paper: https://netdevconf.org/1.2/papers/ktls.pdf
>
> Aviad Yehezkel (1):
>   tcp: export do_tcp_sendpages and tcp_rate_check_app_limited functions
>
> Boris Pismenny (2):
>   tcp: ULP infrastructure
>   tls: Documentation
>
> Ilya Lesokhin (1):
>   tls: kernel TLS support
>
>  Documentation/networking/tls.txt   | 135 +++++++
>  MAINTAINERS                        |  10 +
>  include/linux/socket.h             |   1 +
>  include/net/inet_connection_sock.h |   4 +
>  include/net/tcp.h                  |  27 ++
>  include/net/tls.h                  | 237 ++++++++++++
>  include/uapi/linux/tcp.h           |   1 +
>  include/uapi/linux/tls.h           |  79 ++++
>  net/Kconfig                        |   1 +
>  net/Makefile                       |   1 +
>  net/ipv4/Makefile                  |   2 +-
>  net/ipv4/sysctl_net_ipv4.c         |  25 ++
>  net/ipv4/tcp.c                     |  33 +-
>  net/ipv4/tcp_ipv4.c                |   2 +
>  net/ipv4/tcp_rate.c                |   1 +
>  net/ipv4/tcp_ulp.c                 | 134 +++++++
>  net/tls/Kconfig                    |  12 +
>  net/tls/Makefile                   |   7 +
>  net/tls/tls_main.c                 | 487 +++++++++++++++++++++++
>  net/tls/tls_sw.c                   | 772 +++++++++++++++++++++++++++++++++++++
>  20 files changed, 1968 insertions(+), 3 deletions(-)
>  create mode 100644 Documentation/networking/tls.txt
>  create mode 100644 include/net/tls.h
>  create mode 100644 include/uapi/linux/tls.h
>  create mode 100644 net/ipv4/tcp_ulp.c
>  create mode 100644 net/tls/Kconfig
>  create mode 100644 net/tls/Makefile
>  create mode 100644 net/tls/tls_main.c
>  create mode 100644 net/tls/tls_sw.c
>
> --
> 2.9.3
>