Skip to content

Commit

Permalink
[DCCP]: Create Documentation/networking/dccp.txt
Browse files Browse the repository at this point in the history
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>
  • Loading branch information
Ian McDonald authored and David S. Miller committed Nov 10, 2005
1 parent ac57d04 commit 98069ff
Showing 1 changed file with 56 additions and 0 deletions.
56 changes: 56 additions & 0 deletions Documentation/networking/dccp.txt
Original file line number Diff line number Diff line change
@@ -0,0 +1,56 @@
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.

0 comments on commit 98069ff

Please sign in to comment.