zilinlin/RFC2PSM huggingface dataset:
Section 1. Purpose and Scope

In 1981, RFC 793 [16] was released, documenting the Transmission
   Control Protocol (TCP) and replacing earlier published specifications
   for TCP.
   Since then, TCP has been widely implemented, and it has been used as
   a transport protocol for numerous applications on the Internet.
   For several decades, RFC 793 plus a number of other documents have
   combined to serve as the core specification for TCP [49].  Over time,
   a number of errata have been filed against RFC 793.  There have also
   been deficiencies found and resolved in security, performance, and
   many other aspects.  The number of enhancements has grown over time
   across many separate documents.  These were never accumulated
   together into a comprehensive update to the base specification.
   The purpose of this document is to bring together all of the IETF
   Standards Track changes and other clarifications that have been made
   to the base TCP functional specification (RFC 793) and to unify them
   into an updated version of the specification.
   Some companion documents are referenced for important algorithms that
   are used by TCP (e.g., for congestion control) but have not been
   completely included in this document.  This is a conscious choice, as
   this base specification can be used with multiple additional
   algorithms that are developed and incorporated separately.  This
   document focuses on the common basis that all TCP implementations
   must support in order to interoperate.  Since some additional TCP
   features have become quite complicated themselves (e.g., advanced
   loss recovery and congestion control), future companion documents may
   attempt to similarly bring these together.
   In addition to the protocol specification that describes the TCP
   segment format, generation, and processing rules that are to be
   implemented in code, RFC 793 and other updates also contain
   informative and descriptive text for readers to understand aspects of
   the protocol design and operation.  This document does not attempt to
   alter or update this informative text and is focused only on updating
   the normative protocol specification.  This document preserves
   references to the documentation containing the important explanations
   and rationale, where appropriate.
   This document is intended to be useful both in checking existing TCP
   implementations for conformance purposes, as well as in writing new
   implementations.