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authorIan McDonald <imcdnzl@gmail.com>2005-11-10 13:04:33 -0800
committerDavid S. Miller <davem@davemloft.net>2005-11-10 13:04:33 -0800
commit98069ff4ec9c73a03e6c61dbb17f8e5a0b85ef6e (patch)
tree406c3ab1c66d28b9f1453b02fce24dca0123d0eb
parentac57d04267383829ce817e522e4ebbb39f50ae75 (diff)
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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
+============
+
+Last updated: 10 November 2005
+
+Contents
+========
+
+- Introduction
+- Missing features
+- Socket options
+- Notes
+
+Introduction
+============
+
+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.
+
+It has a base protocol and pluggable congestion control IDs (CCIDs).
+
+It is at draft RFC status and the homepage for DCCP as a protocol is at:
+ http://www.icir.org/kohler/dcp/
+
+Missing features
+================
+
+The DCCP implementation does not currently have all the features that are in
+the draft RFC.
+
+In particular the following are missing:
+- CCID2 support
+- feature negotiation
+
+When testing against other implementations it appears that elapsed time
+options are not coded compliant to the specification.
+
+Socket options
+==============
+
+DCCP_SOCKOPT_PACKET_SIZE is used for CCID3 to set default packet size for
+calculations.
+
+DCCP_SOCKOPT_SERVICE sets the service. This is compulsory as per the
+specification. If you don't set it you will get EPROTO.
+
+Notes
+=====
+
+SELinux does not yet have support for DCCP. You will need to turn it off or
+else you will get EACCES.
+
+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.