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==== SMB3 features in Samba ====

<[center]
<[columns]
[[[.65\textwidth]]]

# SMB 3.0 (Win8 / 2012):
#* new crypto (sign/encrypt) [4.0]
#* secure negotiation [4.0]
#* durable handles v2 [4.0]
#* persistent file handles [WIP/tracer]
#* '''_red_Multi-Channel_''' [WIP+]
#* SMB direct [designing/starting]
#* cluster features [designing]
#** witness [WIP+]
#* storage features [WIP]
# SMB 3.0.2 (Win8.1 / 2012R2): [master]
# SMB 3.1.1 (Win10 / 2014):
#* negotiate contexts, preauth: [master] 

[[[.35\textwidth]]]
%<<<durable-crop-colormod-1024,width=.9\textwidth>>>
<<<smb-auto-crop1,width=\textwidth>>>
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==== SMB 3.1 ====

<[block]{implemented}
* 3.1.1 dialect
* negotiate contexts
* preauthentication integrity
* encryption improvements (choose cipher) \\ %
AES-128-CCM --> AES-128-GCM
[block]>

<[block]{not implemented}
* cluster dialect fencing
* cluster client failover v2 (client)
[block]>


[frame]>

<[sambabg]

==== ====[plain]

<[center]
\Large
'''Multi-Channel'''
[center]>

[frame]>
[sambabg]>


==== Multi-Channel - General ====

* bind multiple transport connections to one session
* increase throughput and fault tolerance

==== Multi-Channel - Windows/Protocol ====

# establish initial session on TCP connection
# find interfaces with interface discovery: \\ %
@FSCTL\_QUERY\_NETWORK\_INTERFACE\_INFO@
# bind additional TCP (or RDMA) connection (channel) to established SMB3 session (session bind)
# windows: uses connections of same (and best quality)
# windows: binds only to a single node
# replay / retry mechanisms, epoch numbers

==== Multi-Channel - Samba ====

<[block]{samba/smbd: multi-process}
* '''Currently:''' process $\Leftrightarrow$ TCP connection
* '''Idea:''' transfer new TPC connection to existing smbd
* '''How?''' ==> use fd-passing (sendmsg/recvmsg)
* '''When?''' as early as possible, based on client GUID \\ %
==> per client GUID single process model
[block]>

==== Multi-Channel - Samba ====

<[center]
<<<smb3-mc-samba_exp.png,height=.9\textheight>>>
[center]>

==== Multi-Channel - Samba ====

# preparation: \\ %
messaging rewrite using unix dgm sockets with sendmsg [DONE,4.2]
# add fd-passing to messaging [DONE,4.2]
# preparations in internal structures [ess.DONE]
# implement smbd message to pass a tcp connection [ess.DONE]
# transfer connection already in negprot (ClientGUID) [largely DONE]
# implement session bind [ess.DONE]
# implement channel epoch numbers [WIP]
# implement interface discovery [WIP]
# implement test case [WIP]


==== @MSG\_SMBXSRV\_CONNECTION\_PASS@ ====

<[block]{from smbXsrv.idl}
<[code]
typedef struct {
    NTTIME                 initial_connect_time;
    GUID                   client_guid;
    hyper                  seq_low;
    DATA_BLOB              negotiate_request;
} smbXsrv_connection_pass0;
[code]>
[block]>

==== Internal Structures (smbXsrv) ====


<[block]{before}
<[code]
smbXsrv_session->smbXsrv_connection
[code]>
[block]>

<[block]{after}
<[code]
smbXsrv_session->smbXsrv_client->smbXsrv_connections
[code]>
[block]>

[frame]>

<[sambabg]

==== ====[plain]

<[center]
\Large
shell breakout to browse code/diff
[center]>



==== ====[plain]

<[center]
\Large
Multi-Channel Demo
[center]>

==== ====[plain]

<[center]
\Large
'''Outlook: SMB Direct'''
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[sambabg]>


==== SMB Direct (RDMA) ====

* windows:
** requires multi-channel
** start with TCP, bind an RDMA channel
** reads and writes use RDMA write/read
** protocol/metadata via send/receive

* wireshark dissector: [DONE]

* samba (TODO):
** prereq: multi-channel / fd-passing
** buffer / transport abstractions [TODO]
** _red_problem_: libraries: not fork safe and no fd-passing \\ %
==> central daemon (or kernel module) to serve as RDMA "proxy"

==== SMB Direct (RDMA) - Plan ====

<[center]
<<<smb3-rdma-samba-v2_exp.png,height=.9\textheight>>>
[center]>


==== SMB features in Samba ====

<[center]
\Large
@https://wiki.samba.org/index.php/Samba3/SMB3@
[center]>



[frame]>

<[sambabg]
==== Thanks for your attention! ====[plain]

%\transdissolve

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{\Large

Questions?

--*3em--

@obnox\@samba.org@

--*.5em--

@madam\@redhat.com@
}
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<<<feet-sand-1280.png,height=.8\textheight>>>
%<<<samba-chilli-flavour-crop-bright-1280.jpg,height=.8\textheight>>>

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