Support for UDP-Lite

	derfel reported
Trac ID	trac#2437
Type	enhancement
Created	2007-02-06 02:00:01Z

This patch adds support for Lightweight User Datagram Protocol (UDP-Lite) (as per RFC 3828) which is similar to the User Datagram Protocol, but can also serve applications in error-prone network environments that prefer to have partially damaged payloads delivered rather than discarded.

This could be help audio/video to use the "good" part of the packet and discard damaged one instead of lost the entire packet.

This patch:

• modify BasePort class adding socketProtocol=0 to be used inside createInternetSocket() during socket creation. Value of 0 select default protocol, but this let us ovveride default protocol.

• add listenUDPLite() to PosixReactorBase class to create socket for UDP Lite and set checksum coverage to only the first 8 byte.

I have kept this patch as small as possible.

Attachments:

• udplite.diff (1772 bytes) - added by derfel on 2007-02-06 02:00:50Z - udplite support
• twisted-udplite.diff (28873 bytes) - added by derfel on 2007-02-09 19:42:25Z - Updated support for UDPLite with test suite from UDP

trac-id__2437 2437
type__enhancement enhancement
reporter__derfel derfel
priority__low low
milestone__ 
branch__ 
branch_author__ 
status__new new
resolution__None None
component__core core
keywords__udplite udplite
time__1170727201000000 1170727201000000
changetime__1266610846000000 1266610846000000
version__None None
owner__derfel derfel
cc__spiv cc__jesstess cc__thijs

Start by reviewing the attached udplite.diff and twisted-udplite.diff, then locate BasePort, createInternetSocket(), and PosixReactorBase. Compare the proposed UDP-Lite test suite with the existing UDP tests. Done means UDP-Lite sockets can be created and listened on with the requested checksum coverage, with corresponding tests passing.