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According to the X.25 documentation, there was a plan to implement X.25-over-802.2-LLC. It never finished but left various code stubs in the X.25 code. At this time it is unlikely that it would ever finish so it may be better to remove those code stubs. Also change the documentation to make it clear that this is not a ongoing plan anymore. Change words like "will" to "could", "would", etc. Cc: Martin Schiller <ms@dev.tdt.de> Signed-off-by: Xie He <xie.he.0141@gmail.com> Link: https://lore.kernel.org/r/20201209033346.83742-1-xie.he.0141@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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.. SPDX-License-Identifier: GPL-2.0
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==================
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Linux X.25 Project
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==================
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As my third year dissertation at University I have taken it upon myself to
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write an X.25 implementation for Linux. My aim is to provide a complete X.25
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Packet Layer and a LAPB module to allow for "normal" X.25 to be run using
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Linux. There are two sorts of X.25 cards available, intelligent ones that
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implement LAPB on the card itself, and unintelligent ones that simply do
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framing, bit-stuffing and checksumming. These both need to be handled by the
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system.
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I therefore decided to write the implementation such that as far as the
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Packet Layer is concerned, the link layer was being performed by a lower
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layer of the Linux kernel and therefore it did not concern itself with
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implementation of LAPB. Therefore the LAPB modules would be called by
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unintelligent X.25 card drivers and not by intelligent ones, this would
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provide a uniform device driver interface, and simplify configuration.
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To confuse matters a little, an 802.2 LLC implementation is also possible
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which could allow X.25 to be run over an Ethernet (or Token Ring) and
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conform with the JNT "Pink Book", this would have a different interface to
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the Packet Layer but there would be no confusion since the class of device
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being served by the LLC would be completely separate from LAPB.
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Just when you thought that it could not become more confusing, another
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option appeared, XOT. This allows X.25 Packet Layer frames to operate over
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the Internet using TCP/IP as a reliable link layer. RFC1613 specifies the
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format and behaviour of the protocol. If time permits this option will also
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be actively considered.
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A linux-x25 mailing list has been created at vger.kernel.org to support the
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development and use of Linux X.25. It is early days yet, but interested
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parties are welcome to subscribe to it. Just send a message to
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majordomo@vger.kernel.org with the following in the message body:
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subscribe linux-x25
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end
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The contents of the Subject line are ignored.
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Jonathan
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g4klx@g4klx.demon.co.uk
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