Draft revised IP security option
RFC 1038

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Network Working Group                                       M. St. Johns
Request for Comments: 1038                                          IETF
                                                            January 1988

                    Draft Revised IP Security Option

Status of this Memo

   This RFC is a pre-publication draft of the revised Internet Protocol
   Security Option.  This draft reflects the version as approved by
   the Protocol Standards Steering Group.  It is provided for
   informational purposes only.  The final version of this document will
   be available from Navy Publications and should not differ from
   this document in any major fashion.

   This document will be published as a change to the MIL-STD 1777,
   "Internet Protocol".  Distribution of this memo is unlimited.

9.3.13.1 Internet Options Defined.

   The following internet options are defined:

        CLASS NUMBER LENGTH DESCRIPTION
        _____ ______ ______ ___________

        0      00000   -    End of Option list:  This option occupies
                            only 1 octet; it has no length octet.
        0      00001   -    No Operation:  This option occupies only 1
                            octet; it has no length octet.
        0      00010   var. Basic Security:  Used to carry security
                            level and accrediting authority flags.
        0      00011   var. Loose Source Routing:  Used to route the
                            datagram based on information supplied by
                            the source.
        0      00101   var. Extended Security:  Used to carry additional
                            security information as required by
                            registered authorities.
        0      01001   var. Strict Source Routing:  Used to route the
                            datagram based on information supplied by
                            the source.
        0      00111   var. Record Route:  Used to trace the route a
                            datagram takes.
        0      01000    4   Stream ID:  Used to carry the stream
                            identifier.
        2      00100   var. Internet Timestamp:  Used to accumulate
                            timing information in transit.

St. Johns                                                       [Page 1]
RFC 1038            Draft Revised IP Security Option        January 1988

9.3.15.3  DoD Basic Security.

     Option type:  130      Option length: variable; minimum length:  4

   The option identifies the U.S. security level to which the datagram
   is to be protected, and the accrediting authorities whose protection
   rules apply to each datagram.

   The option is used by accredited trusted components of an internet
   to:

     a.  Validate the datagram as appropriate for transmission from the
         source.

     b.  Guarantee that the route taken by the datagram (including the
         destination) is protected to the level required by all
         indicated accrediting authorities.

     c.  Supply common label information required by computer security
         models.

     This option must be copied on fragmentation.  This option appears
     at most once in a datagram.

   The format of this option is as follows:

   +--------------+-----------+-------------+-------------//----------+
   |  10000010    |  XXXXXXXX | SSSSSSSS    |  AAAAAAA[1]    AAAAAAA0 |
   |              |           |             |         [0]             |
   +--------------+-----------+-------------+-------------//----------+
      TYPE = 130   LENGTH      CLASSIFICATION      PROTECTION
                   VARIABLE      PROTECTION         AUTHORITY
                                   LEVEL              FLAGS

                   FIGURE 10-A.  SECURITY OPTION FORMAT

9.3.15.3.1  Length.

   The length of the option is variable.  The minimum length option is
   4.

9.3.15.3.2  Classification Protection Level.

   This field specifies the U.S. classification level to which the
   datagram should be protected.  The information in the datagram should
   be assumed to be at this level until and unless it is regraded in
   accordance with the procedures of all indicated protecting

St. Johns                                                       [Page 2]
RFC 1038            Draft Revised IP Security Option        January 1988

   authorities.  This field specifies one of the four U.S.
   classification levels, and is encoded as follows:

                 11011110   -   Top Secret
                 10101101   -   Secret
                 01111010   -   Confidential
                 01010101   -   Unclassified

9.3.15.3.3  Protection Authorities Flags.

   This field indicates the National Access Program(s) with accrediting
   authority whose rules apply to the protection of the datagram.

      a.  Field Length:  This field is variable in length.  The low-
      order bit (Bit 7) of each octet is encoded as "zero" if it is the