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[DCCP]: Create Documentation/networking/dccp.txt
This patch is a first go at some documentation. Please advise if gmail has mangled patch and I will revert to an attachment: Signed-off-by: Ian McDonald <imcdnzl@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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DCCP protocol | ||
============ | ||
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Last updated: 10 November 2005 | ||
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Contents | ||
======== | ||
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- Introduction | ||
- Missing features | ||
- Socket options | ||
- Notes | ||
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Introduction | ||
============ | ||
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Datagram Congestion Control Protocol (DCCP) is an unreliable, connection | ||
based protocol designed to solve issues present in UDP and TCP particularly | ||
for real time and multimedia traffic. | ||
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It has a base protocol and pluggable congestion control IDs (CCIDs). | ||
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It is at draft RFC status and the homepage for DCCP as a protocol is at: | ||
http://www.icir.org/kohler/dcp/ | ||
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Missing features | ||
================ | ||
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The DCCP implementation does not currently have all the features that are in | ||
the draft RFC. | ||
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In particular the following are missing: | ||
- CCID2 support | ||
- feature negotiation | ||
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When testing against other implementations it appears that elapsed time | ||
options are not coded compliant to the specification. | ||
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Socket options | ||
============== | ||
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DCCP_SOCKOPT_PACKET_SIZE is used for CCID3 to set default packet size for | ||
calculations. | ||
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DCCP_SOCKOPT_SERVICE sets the service. This is compulsory as per the | ||
specification. If you don't set it you will get EPROTO. | ||
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Notes | ||
===== | ||
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SELinux does not yet have support for DCCP. You will need to turn it off or | ||
else you will get EACCES. | ||
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DCCP does not travel through NAT successfully at present. This is because | ||
the checksum covers the psuedo-header as per TCP and UDP. It should be | ||
relatively trivial to add Linux NAT support for DCCP. |