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Networking Implementation Notes
Samuel J. Leffler, William N. Joy, Robert S. Fabry, and Michael J. Karels
Computer Systems Research Group
Computer Science Division
Department of Electrical Engineering and Computer Science
University of California, Berkeley
* UNIX is a trademark of Bell Laboratories.
This report describes the internal structure of the
networking facilities developed for the 4.4BSD version
of the UNIX* operating system
for the VAX\(dg. These facilities
\(dg DEC, VAX, DECnet, and UNIBUS are trademarks of
Digital Equipment Corporation.
are based on several central abstractions which
structure the external (user) view of network communication
as well as the internal (system) implementation.
The report documents the internal structure of the networking system.
The ``Berkeley Software Architecture Manual, 4.4BSD Edition'' (PSD:5)
provides a description of the user interface to the networking facilities.
.\".tl '\\*(LH'\\*(CH'\\*(RH'
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.B "4. Internal address representation"
.B "5. Memory management"
6.1.2. Socket data queues
6.1.3. Socket connection queuing
6.3. Network-interface layer
.B "7. Socket/protocol interface"
.B "8. Protocol/protocol interface"
.B "9. Protocol/network-interface interface"
.B "10. Gateways and routing issues
10.2. Routing table interface
10.3. User level routing policies
.B "12. Buffering and congestion control"
12.2. Protocol buffering policies
.B "13. Out of band data"
.B "14. Trailer protocols"
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