Network Working Group M. Tuexen Internet-Draft Muenster Univ. of Applied Sciences Updates: 4960 (if approved) R. Stewart Intended status: Standards Track Huawei Expires: December 8, 2010 June 6, 2010 Stream Control Transmission Protocol (SCTP) Chunk Flags Registration draft-ietf-tsvwg-sctp-chunk-flags-00.txt Abstract The current definition of the Stream Control Transmission Protocol (SCTP) is missing a procedure for registering chunk flags for already defined chunk types. This document defines this procedure. It does not change SCTP in any other way. Status of this Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. 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Tuexen & Stewart Expires December 8, 2010 [Page 1] Internet-Draft SCTP Chunk Flags Registration June 2010 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 3 3.1. Updated IETF Chunk Extension . . . . . . . . . . . . . . . 3 3.2. New IETF Chunk Flags Registration . . . . . . . . . . . . . 4 3.3. Initial Registrations . . . . . . . . . . . . . . . . . . . 4 3.3.1. DATA Chunk Flags . . . . . . . . . . . . . . . . . . . 4 3.3.2. INIT Chunk Flags . . . . . . . . . . . . . . . . . . . 4 3.3.3. INIT ACK Chunk Flags . . . . . . . . . . . . . . . . . 5 3.3.4. SACK Chunk Flags . . . . . . . . . . . . . . . . . . . 5 3.3.5. HEARTBEAT Chunk Flags . . . . . . . . . . . . . . . . . 5 3.3.6. HEARTBEAT ACK Chunk Flags . . . . . . . . . . . . . . . 5 3.3.7. ABORT Chunk Flags . . . . . . . . . . . . . . . . . . . 5 3.3.8. SHUTDOWN Chunk Flags . . . . . . . . . . . . . . . . . 5 3.3.9. SHUTDOWN ACK Chunk Flags . . . . . . . . . . . . . . . 5 3.3.10. ERROR Chunk Flags . . . . . . . . . . . . . . . . . . . 6 3.3.11. COOKIE ECHO Chunk Flags . . . . . . . . . . . . . . . . 6 3.3.12. COOKIE ACK Chunk Flags . . . . . . . . . . . . . . . . 6 3.3.13. ECNE Chunk Flags . . . . . . . . . . . . . . . . . . . 6 3.3.14. CWR Chunk Flags . . . . . . . . . . . . . . . . . . . . 6 3.3.15. SHUTDOWN COMPLETE Chunk Flags . . . . . . . . . . . . . 6 3.3.16. AUTH Chunk Flags . . . . . . . . . . . . . . . . . . . 6 3.3.17. ASCONF ACK Chunk Flags . . . . . . . . . . . . . . . . 7 3.3.18. PAD Chunk Flags . . . . . . . . . . . . . . . . . . . . 7 3.3.19. FORWARD TSN Chunk Flags . . . . . . . . . . . . . . . . 7 3.3.20. ASCONF Chunk Flags . . . . . . . . . . . . . . . . . . 7 4. Security Considerations . . . . . . . . . . . . . . . . . . . . 7 5. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 7 6. Normative References . . . . . . . . . . . . . . . . . . . . . 7 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 8 Tuexen & Stewart Expires December 8, 2010 [Page 2] Internet-Draft SCTP Chunk Flags Registration June 2010 1. Introduction [RFC4960], which currently defines the Stream Control Transmission Protocol (SCTP), provides a procedure to define new chunk types. However, several protocol extensions currently being discussed need to define new chunk flags for existing chunks. The only way to do this is to obsolete [RFC4960], which is not appropriate. This document overcomes this limitation and provides the procedure to register chunk flags for existing chunk types. The protocol is not changed in any other way. Therefore only Section 14.1 of [RFC4960] is affected. 2. Conventions The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119]. 3. IANA Considerations Section 3.1 describes the updated procedure for chunk type registration and replaces Section 14.1 of [RFC4960]. Section 3.2 adds a new procedure for chunk flag registration to the updated section 14.1 of [RFC4960]. The IANA is requested to create a Chunk Flag registry. The initial contents of the registry should be assigned using the values specified in Section 3.3. 3.1. Updated IETF Chunk Extension The assignment of new chunk parameter type codes is done through an IETF Review action, as defined in [RFC5226]. Documentation of a new chunk MUST contain the following information: a) A long and short name for the new chunk type; b) A detailed description of the structure of the chunk, which MUST conform to the basic structure defined in section 3.2 of [RFC4960]; c) A detailed definition and description of intended use of each field within the chunk, including the chunk flags if any. Defined chunk flags will be used as initial entries in the chunk flags table for the new chunk type; Tuexen & Stewart Expires December 8, 2010 [Page 3] Internet-Draft SCTP Chunk Flags Registration June 2010 d) A detailed procedural description of the use of the new chunk type within the operation of the protocol. The last chunk type (255) is reserved for future extension if necessary. IANA creates for each new chunk type a registration table for the chunk flags for this type. The procedure for registering particular chunk flags is described in the following Section 3.2. 3.2. New IETF Chunk Flags Registration The assignment of new chunk flags is done through an RFC required action, as defined in [RFC5226]. Documentation of the chunk flags MUST contain the following information: a) A name for the new chunk flag; b) A detailed procedural description of the use of the new chunk flag within the operation of the protocol. It MUST be considered that implementations not supporting the flag will just ignore it. IANA selects a chunk flags value, exactly one of 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, or 0x80, which MUST be unique within the chunk flag values for the specific chunk type. 3.3. Initial Registrations This section describes the initially defined chunk flag tables, one table per chunk. Most of the tables are currently empty. 3.3.1. DATA Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ | 0x01 | E bit | [RFC4960] | | 0x02 | B bit | [RFC4960] | | 0x04 | U bit | [RFC4960] | +------------------+-----------------+-----------+ 3.3.2. INIT Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ Tuexen & Stewart Expires December 8, 2010 [Page 4] Internet-Draft SCTP Chunk Flags Registration June 2010 3.3.3. INIT ACK Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ 3.3.4. SACK Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ 3.3.5. HEARTBEAT Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ 3.3.6. HEARTBEAT ACK Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ 3.3.7. ABORT Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ | 0x01 | T bit | [RFC4960] | +------------------+-----------------+-----------+ 3.3.8. SHUTDOWN Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ 3.3.9. SHUTDOWN ACK Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ Tuexen & Stewart Expires December 8, 2010 [Page 5] Internet-Draft SCTP Chunk Flags Registration June 2010 3.3.10. ERROR Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ 3.3.11. COOKIE ECHO Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ 3.3.12. COOKIE ACK Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ 3.3.13. ECNE Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ 3.3.14. CWR Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ 3.3.15. SHUTDOWN COMPLETE Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ | 0x01 | T bit | [RFC4960] | +------------------+-----------------+-----------+ 3.3.16. AUTH Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ Tuexen & Stewart Expires December 8, 2010 [Page 6] Internet-Draft SCTP Chunk Flags Registration June 2010 3.3.17. ASCONF ACK Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ 3.3.18. PAD Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ 3.3.19. FORWARD TSN Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ 3.3.20. ASCONF Chunk Flags +------------------+-----------------+-----------+ | Chunk Flag Value | Chunk Flag Name | Reference | +------------------+-----------------+-----------+ 4. Security Considerations This document does not add any additional security considerations in addition to the ones given in [RFC4960]. 5. Acknowledgments The authors wish to thank Gorry Fairhurst for his invaluable comments. 6. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC4960] Stewart, R., "Stream Control Transmission Protocol", RFC 4960, September 2007. [RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP 26, RFC 5226, May 2008. Tuexen & Stewart Expires December 8, 2010 [Page 7] Internet-Draft SCTP Chunk Flags Registration June 2010 Authors' Addresses Michael Tuexen Muenster Univ. of Applied Sciences Stegerwaldstr. 39 48565 Steinfurt Germany Email: tuexen@fh-muenster.de Randall R. Stewart Huawei Chapin, SC 29036 USA Email: rstewart@huawei.com Tuexen & Stewart Expires December 8, 2010 [Page 8]