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Versions: 00 01 02 03 04 05 06 RFC 5665

NFSv4                                                          M. Eisler
Internet-Draft                                                    NetApp
Updates: 1833 (if approved)                             December 3, 2008
Intended status: Standards Track
Expires: June 6, 2009


   IANA Considerations for RPC Net Identifiers and Universal Address
                                Formats
                   draft-ietf-nfsv4-rpc-netid-04.txt

Status of this Memo

   By submitting this Internet-Draft, each author represents that any
   applicable patent or other IPR claims of which he or she is aware
   have been or will be disclosed, and any of which he or she becomes
   aware will be disclosed, in accordance with Section 6 of BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   The list of current Internet-Drafts can be accessed at
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   This Internet-Draft will expire on June 6, 2009.

Abstract

   This Internet-Draft lists IANA Considerations for RPC Network
   Identifiers (netids) and RPC Universal Network Addresses (uaddrs).
   This Internet-Draft updates, but does not replace, RFC1833.

Requirements Language

   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 RFC 2119 [1].




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Table of Contents

   1.  Introduction and Motivation  . . . . . . . . . . . . . . . . .  3
   2.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Security Considerations  . . . . . . . . . . . . . . . . . . .  3
   4.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  3
     4.1.  IANA Considerations for Netids . . . . . . . . . . . . . .  3
       4.1.1.  Initial Registry . . . . . . . . . . . . . . . . . . .  5
       4.1.2.  Updating Registrations . . . . . . . . . . . . . . . .  7
     4.2.  IANA Considerations for Uaddr Formats  . . . . . . . . . .  7
       4.2.1.  Initial Registry . . . . . . . . . . . . . . . . . . .  8
       4.2.2.  Updating Registrations . . . . . . . . . . . . . . . .  9
       4.2.3.  Uaddr Formats  . . . . . . . . . . . . . . . . . . . .  9
     4.3.  Cross Referencing Between the Netid and Format Registry  . 10
   5.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
     5.1.  Normative References . . . . . . . . . . . . . . . . . . . 11
     5.2.  Informative References . . . . . . . . . . . . . . . . . . 11
   Appendix A.  RFC Editor Notes  . . . . . . . . . . . . . . . . . . 12
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 12
   Intellectual Property and Copyright Statements . . . . . . . . . . 13































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1.  Introduction and Motivation

   The concepts of an RPC (defined in RFC1831 [4]) Network Identifier
   (netid) and an RPC Universal Address (uaddr) were introduced in
   RFC1833 [2] for distinguishing network addresses of multiple
   protocols and representing those addresses in a canonical form.
   RFC1833 states that a netid ``is defined by a system administrator
   based on local conventions, and cannot be depended on to have the
   same value on every system.''  (The netid is contained in the field
   r_netid of the data type rpcb_entry, and the uaddr is contained in
   the field r_addr of the same data type, where rpcb_entry is defined
   in RFC1833.)  Since the publication of RFC1833, it has been found
   that protocols like NFSv4.0 [5] and RPC/RDMA [6] depend on consistent
   values of netids and representations of uaddrs.  Current practices
   tend to ensure this consistency.  Thus, this document identifies the
   considerations for IANA to establish registries of netids and uaddr
   formats for RPC and specifies the initial content of the two
   registries.


2.  Acknowledgements

   Lars Eggert and Juergen Schoenwaelder reviewed the document and gave
   valuable feed back for improving its readability.


3.  Security Considerations

   Since this document is only concerned with the IANA management of the
   Network Identifier (netid) and Universal Network Addresses (uaddrs)
   format registry, it raises no new security issues.


4.  IANA Considerations

   This section uses terms that are defined in RFC5226 [7].

4.1.  IANA Considerations for Netids

   IANA will create a registry called "ONC RPC Netids".  The remainder
   of this section describes the registry.

   All assignments to the ONC RPC Netids registry are made on one of two
   bases:

   o  First Come First Served basis per section 4.1 of RFC5226.





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   o  Standards Action per section 4.1 of RFC5226.

   Netids can be up to 2^32 - 1 octets in length.  However, to ensure
   that practical values for Standards Track protocols are not
   exhausted, the values of netids one to eight octets long should be
   used for netids assigned on the Standards Action basis.  Assignments
   made on a First Come First Served basis should be assigned netids of
   length 9 to 128 octets long.  All netids, regardless of length, that
   start with the prefixes "STDS" or "FCFS" are Reserved, in order to
   extend the name space of either basis.  In addition, to give IESG the
   flexibility in the future to permit Private and Experimental Uses,
   all netids with the prefixes "PRIV" or "EXPE" are Reserved.  The zero
   length netid is Reserved.  Some exceptions are listed in Table 2.  A
   recommended convention for netids corresponding to transports that
   work over the IPv6 protocol is to have "6" as the last character in
   the netid's name.

   Since netids are not constructed in an explicit hierarchical manner,
   this document does not provide for Hierarchical Allocation of netids.
   Nonetheless, the octet "." in a netid string is Reserved for future
   possible provision of Hierarchical Allocation.

   The registry of netids is a list of assignments, each containing five
   fields for each assignment.

   1.  A US-ASCII string name that is the actual netid.  This name MUST
       NOT conflict with any other netid.  This string name can be 1 to
       128 octets long.

   2.  A constant name that can be used for software programs that wish
       to use the transport protocol associated with protocol.  The name
       of the constant typically has the prefix: 'NC_', and a suffix
       equal to the upper case version of the netid.  This constant name
       should be a constant that is valid in the 'C' programming
       language.  This constant name MUST NOT conflict with any other
       netid constant name.  Constant names with the prefix "NC_STDS",
       "NC_FCFS", "NC_PRIV", or "NC_EXPE" are reserved.  Constant names
       with a prefix of "NC_" and a total length of 11 characters or
       less should be for assignments made on the Standards Action
       basis.  The constant name can be 1 to 131 octets long.

   3.  A description and/or a reference to a description of the how the
       netid will be used.  For assignments made on a First Come First
       Served basis the description should include, if applicable, a
       reference to the transport and network protocols corresponding to
       the netid.  For assignments made on a Standards Action basis, the
       description field must include the RFC numbers of the protocol
       associated with the netid, including if applicable, RFC numbers



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       of the transport and network protocols.  This field can be up to
       1024 octets.  If more space is required, an RFC should be
       published.

   4.  A point of contact of the registrant.  The point of contact can
       consume up to 256 octets (or more if IANA permits).  For
       assignments made on a First Come First Served basis,

       *  the point of contact should include an email address.

       *  subject to authorization by a Designated Expert, the point of
          contact may be omitted for extraordinary situations, such as
          the registration of a commonly used netid where the owner is
          unknown.

       For assignments made on a Standards Action basis the point of
       contact is always IESG.

   5.  A numerical value, used to cross reference the netid assignment
       with an assignment in the uaddr format registry (see
       Section 4.2).  If the registrant is registering a netid that
       cross references an existing assignment in the uaddr format
       registry, then the registrant provides the actual value of the
       cross reference along with the date the registrant retrieved the
       cross reference value from the uaddr format registry.  If the
       registrant is registering both a new netid and new uaddr format,
       then the registrant provides a value of TBD1 in the netid
       request, and uses TBD1 in the the uaddr format request.  IANA
       will then substitute TBD1 for cross reference number IANA
       allocates.

4.1.1.  Initial Registry

   The initial list of netids is broken into those assigned on a First
   Come First Serve basis in Table 1 and those assigned on a Standards
   Action basis in Table 2.  These lists will change when IANA registers
   additional netids as needed, and the authoritative list of registered
   netids will always live with IANA.

   +-------------+--------------+---------------------------+-----+----+
   | Netid       | Constant     | Description and/or        | PoC | CR |
   |             | Name         | Reference                 |     |    |
   +-------------+--------------+---------------------------+-----+----+
   | "-"         | NC_NOPROTO   | RFC1833 [2],              |     | 1  |
   |             |              | Section 4.2.3.2 of        |     |    |
   |             |              | RFCTBD2                   |     |    |





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   | "ticlts"    | NC_TICLTS    | The loop back             |     | 0  |
   |             |              | connectionless transport  |     |    |
   |             |              | used in System V Release  |     |    |
   |             |              | 4 and other operating     |     |    |
   |             |              | systems. Although this    |     |    |
   |             |              | assignment is made on a   |     |    |
   |             |              | First Come First Served   |     |    |
   |             |              | basis and is fewer than 9 |     |    |
   |             |              | characters long, the      |     |    |
   |             |              | exception is authorized.  |     |    |
   |             |              | See [8].                  |     |    |
   | "ticots"    | NC_TICOTS    | The loop back             |     | 0  |
   |             |              | connection-oriented       |     |    |
   |             |              | transport used in System  |     |    |
   |             |              | V Release 4 and other     |     |    |
   |             |              | operating systems. See    |     |    |
   |             |              | [8]. Although this        |     |    |
   |             |              | assignment is made on a   |     |    |
   |             |              | First Come First Served   |     |    |
   |             |              | basis and is fewer than 9 |     |    |
   |             |              | characters long, the      |     |    |
   |             |              | exception is authorized.  |     |    |
   | "ticotsord" | NC_TICOTSORD | The loop back             |     | 0  |
   |             |              | connection-oriented with  |     |    |
   |             |              | orderly-release transport |     |    |
   |             |              | used in System V Release  |     |    |
   |             |              | 4 and other operating     |     |    |
   |             |              | systems. See [8].         |     |    |
   +-------------+--------------+---------------------------+-----+----+

         Table 1: Initial First Come First Serve Netid Assignments

   PoC: Point of Contact.  CR: Cross Reference to the Uaddr Format
   Registry.

















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   +---------+--------------+------------------------------+------+----+
   | Netid   | Constant     | RFC(s) and Description (if   | PoC  | CR |
   |         | Name         | needed)                      |      |    |
   +---------+--------------+------------------------------+------+----+
   | "dccp"  | NC_DCCP      | RFC4340 [9] RFC0760 [10]     | IESG | 2  |
   | "dccp6" | NC_DCCP6     | RFC4340 [9] RFC2460 [11]     | IESG | 3  |
   | "icmp"  | NC_ICMP      | RFC0777 [12] RFC0760 [10]    | IESG | 4  |
   | "icmp6" | NC_ICMP6     | RFC0777 [12] RFC2460 [11]    | IESG | 4  |
   | "rdma"  | NC_RDMA      | RFCTBD1 [6] RFC0760 [10]     | IESG | 2  |
   | "rdma6" | NC_RDMA6     | RFCTBD1 [6] RFC2460 [11]     | IESG | 3  |
   | "sctp"  | NC_SCTP      | RFC2960 [13] RFC0760 [10]    | IESG | 2  |
   | "sctp6" | NC_SCTP6     | RFC2960 [13] RFC2460 [11]    | IESG | 3  |
   | "tcp"   | NC_TCP       | RFC0675 [14] RFC0760 [10]    | IESG | 2  |
   | "tcp6"  | NC_TCP6      | RFC0675 [14] RFC2460 [11]    | IESG | 3  |
   | "udp"   | NC_UDP       | RFC0768 [15] RFC0760 [10]    | IESG | 2  |
   | "udp6"  | NC_UDP6      | RFC0768 [15] RFC2460 [11]    | IESG | 3  |
   +---------+--------------+------------------------------+------+----+

            Table 2: Initial Standards Action Netid Assignments

4.1.2.  Updating Registrations

   Per section 5.2 of RFC5226 the registrant is always permitted to
   update a registration made on a First Come First Served basis
   "subject to the same constraints and review as with new
   registrations."  IESG or a Designated Expert is permitted to update
   any registration made on a First Come First Served basis, which
   normally is done when the PoC cannot be reached in order to make
   necessary updates.  Examples where an update would be needed include,
   but are not limited to: the email address or other contact
   information becomes invalid; the reference to the corresponding
   protocol becomes obsolete or unavailable; and RFC1833 is updated or
   replaced in such a way that the scope of netids changes, requiring
   additional fields in the assignment.

   Only IESG, on the advice of a Designated Expert, can update a
   registration made on a Standards Action basis.

4.2.  IANA Considerations for Uaddr Formats

   IANA will create a registry called "ONC RPC Uaddr Format Registry"
   (called the "format registry" for the remainder of this document).
   The remainder of this section describes the registry.

   All assignments to the format registry are made on one of two bases:

   o  First Come First Served basis per section 4.1 of RFC5226.




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   o  Standards Action per section 4.1 of RFC5226.

   The registry of formats is a list of assignments, each containing
   four fields for each assignment.

   1.  The basis for the assignment, which can be either FCFS for First
       Come First Served assignments, or STDS for Standards Action
       assignments.

   2.  A description and/or reference to a description of the actual
       uaddr format.  Assignments made on a Standards Action basis
       always have a reference to an RFC.  This field can be up to 1024
       octets.  If more space is required, an RFC should be published.

   3.  For assignments made on a First Come First Served basis, a point
       of contact, including an email address.  The point of contact can
       consume up to 256 octets (or more if IANA permits).  Subject to
       authorization by a Designated Expert, the point of contact may be
       omitted for extraordinary situations, such as the registration of
       a commonly used format where the owner is unknown.  For
       assignments made on a Standards Action basis the point of contact
       is always IESG.

   4.  A numerical value, used to cross reference the format assignment
       with an assignment in the netid registry.  The registrant
       provides a value of TBD1 for the cross reference filed when
       requesting an assignment.  IANA will assign TBD1 to a real value.

   All requests for assignments to the format registry must undergo
   Expert Review.  All requests for assignments made on a Standards
   Action basis must be approved by IESG.

4.2.1.  Initial Registry

   The initial list of formats is in Table 3.  This lists will change
   when IANA registers additional formats as needed, and the
   authoritative list of registered formats will always live with IANA.

   +-------+-----------------------------------------------+------+----+
   | Basis | Description and/or Reference                  | PoC  | CR |
   +-------+-----------------------------------------------+------+----+
   | FCFS  | System V Release 4 loopback transport uaddr   |      | 0  |
   |       | format. Section 4.2.3.1 of RFCTBD2            |      |    |
   | FCFS  | Uaddr format for NC_NOPROTO. Section 4.2.3.2  |      | 1  |
   |       | of RFCTBD2                                    |      |    |
   | STDS  | Uaddr format for IPv4 transports.             | IESG | 2  |
   |       | Section 4.2.3.3 of RFCTBD2                    |      |    |




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   | STDS  | Uaddr format for IPv6 transports.             | IESG | 3  |
   |       | Section 4.2.3.4 of RFCTBD2                    |      |    |
   | STDS  | Uaddr formation for ICMP. Section 4.2.3.5 of  | IESG | 4  |
   |       | RFCTBD2                                       |      |    |
   +-------+-----------------------------------------------+------+----+

                    Table 3: Initial Format Assignments

4.2.2.  Updating Registrations

   The registrant is always permitted to update a registration made on a
   First Come First Served basis "subject to the same constraints and
   review as with new registrations.", but as with new registrations,
   any requested changes to any field other the point of contact
   requires Expert Review.  IESG or a Designated Expert is permitted to
   update any registration made on a First Come First Served basis,
   which normally is done when the PoC cannot be reached in order to
   make necessary updates.  Examples where an update would be needed
   include, but are not limited to: the email address or other contact
   information becomes invalid; the reference to the format description
   becomes obsolete or unavailable; and RFC1833 is updated or replaced
   in such a way that the scope of uaddr formats changes, requiring
   additional fields in the assignment.

   Only IESG, on the advice of a Designated Expert, can update a
   registration made on a Standards Action basis.

4.2.3.  Uaddr Formats

4.2.3.1.  Uaddr Format for System V Release 4 Loopback Transports

   Although RFC1833 specifies the uaddr as the XDR data type string
   (hence, limited to US-ASCII), implementations of the System V Release
   4 loopback transports will use an opaque string of octets.  Thus the
   format of a loopback transport address is any non-zero length array
   of octets.

4.2.3.2.  Uaddr Format for Netid "-"

   There is no address format for netid "-".  This netid is apparently
   for internal use for supporting some implementations of RFC1833.

4.2.3.3.  Uaddr Format for Most IPv4 Transports

   Most transport protocols that operate over IPv4 use 16 bit port
   numbers, including DCCP [9], RDMA [6], SCTP [13], TCP [14], and UDP
   [15].  The format of the uaddr for the above 16 bit port transports
   (when used over IPv4) is the US-ASCII string:



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      h1.h2.h3.h4.p1.p2

   The prefix, "h1.h2.h3.h4", is the standard textual form for
   representing an IPv4 address, which is always four octets long.
   Assuming big-endian ordering, h1, h2, h3, and h4, are respectively,
   the first through fourth octets each converted to ASCII-decimal.  The
   suffix, "p1.p2", is a textual form for representing a service port.
   Assuming big-endian ordering, p1 and p2 are, respectively, the first
   and second octets each converted to ASCII-decimal.  For example, if a
   host, in big-endian order, has an address in hexadecimal of
   0xC0000207 and there is a service listening on, in big endian order,
   port 0xCB51 (decimal 52049) then the complete uaddr is
   "192.0.2.7.203.81".

4.2.3.4.  Uaddr Format for Most IPv6 Transports

   Most transport protocols that operate over IPv6 use 16 bit port
   numbers, including DCCP [9], RDMA [6], SCTP [13], TCP [14], and UDP
   [15].  The format of the uaddr for the above 16 bit port transports
   (when used over IPv6) is the US-ASCII string:

      x1:x2:x3:x4:x5:x6:x7:x8.p1.p2

   The suffix "p1.p2" is the service port, and is computed the same way
   as with uaddrs for transports over IPv4 (see Section 4.2.3.3).  The
   prefix, "x1:x2:x3:x4:x5:x6:x7:x8", is the preferred textual form for
   representing an IPv6 address as defined in Section 2.2 of RFC4291
   [3].  Additionally, the two alternative forms specified in Section
   2.2 of RFC4291 are also acceptable.

4.2.3.5.  Uaddr Format for ICMP over IPv4 and IPv6

   As ICMP is not a true transport, there is no uaddr format for ICMP.
   The netid assignments "icmp" and "icmp6" and their shared uaddr
   "format" are listed to prevent any registrant from allocating the
   netids "icmp" and "icmp6" for a purpose that would likely cause
   confusion.

4.3.  Cross Referencing Between the Netid and Format Registry

   The last field of the netids registry is used to cross reference with
   the last field of the format registry.  IANA is under no obligation
   to maintain same numeric value in cross references when updating each
   registry; i.e.  IANA is free to "re-number" these corresponding
   fields.  However, if IANA does so, both the netid and format
   registries must be updated atomically.





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5.  References

5.1.  Normative References

   [1]   Bradner, S., "Key words for use in RFCs to Indicate Requirement
         Levels", RFC 2119, March 1997.

   [2]   Srinivasan, R., "Binding Protocols for ONC RPC Version 2",
         RFC 1833, August 1995.

   [3]   Hinden, R. and S. Deering, "IP Version 6 Addressing
         Architecture", RFC 4291, February 2006.

5.2.  Informative References

   [4]   Srinivasan, R., "RPC: Remote Procedure Call Protocol
         Specification Version 2", RFC 1831, August 1995.

   [5]   Shepler, S., Callaghan, B., Robinson, D., Thurlow, R., Beame,
         C., Eisler, M., and D. Noveck, "Network File System (NFS)
         version 4 Protocol", RFC 3530, April 2003.

   [6]   Talpey, T. and B. Callaghan, "Remote Direct Memory Access
         Transport for Remote Procedure Call",
         draft-ietf-nfsv4-rpcrdma-08 (work in progress), April 2008.

   [7]   Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA
         Considerations Section in RFCs", BCP 26, RFC 5226, May 2008.

   [8]   American Telephone and Telegraph Company, "UNIX System V,
         Release 4 Programmer's Guide: Networking Interfaces, ISBN
         0139470786", 1990.

   [9]   Kohler, E., Handley, M., and S. Floyd, "Datagram Congestion
         Control Protocol (DCCP)", RFC 4340, March 2006.

   [10]  Postel, J., "DoD standard Internet Protocol", RFC 760,
         January 1980.

   [11]  Deering, S. and R. Hinden, "Internet Protocol, Version 6 (IPv6)
         Specification", RFC 2460, December 1998.

   [12]  Postel, J., "Internet Control Message Protocol", RFC 777,
         April 1981.

   [13]  Stewart, R., Xie, Q., Morneault, K., Sharp, C., Schwarzbauer,
         H., Taylor, T., Rytina, I., Kalla, M., Zhang, L., and V.
         Paxson, "Stream Control Transmission Protocol", RFC 2960,



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         October 2000.

   [14]  Cerf, V., Dalal, Y., and C. Sunshine, "Specification of
         Internet Transmission Control Program", RFC 675, December 1974.

   [15]  Postel, J., "User Datagram Protocol", STD 6, RFC 768,
         August 1980.


Appendix A.  RFC Editor Notes

   [RFC Editor: please remove this section prior to publication.]

   [RFC Editor: Please replace occurrences of RFCTBD1 with the RFCxxxx
   where xxxx is the RFC number assigned to the document referenced in
   [6].]

   [RFC Editor: Please replace occurrences of RFCTBD2 with the RFCyyyy
   where yyyy is the RFC number assigned to this document.]


Author's Address

   Mike Eisler
   NetApp
   5765 Chase Point Circle
   Colorado Springs, CO  80919
   US

   Phone: +1-719-599-9026
   Email: mike@eisler.com




















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Full Copyright Statement

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   specification can be obtained from the IETF on-line IPR repository at
   http://www.ietf.org/ipr.

   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights that may cover technology that may be required to implement
   this standard.  Please address the information to the IETF at
   ietf-ipr@ietf.org.











Eisler                    Expires June 6, 2009                 [Page 13]


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