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Versions: (draft-tseng-dhc-isnsoption) 00 01 02 03 04 05 06 07 08 09 10 11 12 13 RFC 4174

        DHC Working Group                                   Charles Monia
        INTERNET DRAFT                                         Josh Tseng
        Expires: August 2003                                Kevin Gibbons
        Internet Draft
        Document: <draft-ietf-dhc-isnsoption-05.txt>       Nishan Systems
        Category: Standards Track                           February 2003
     
     
                    DHCP Options for Internet Storage Name Service
     
     Status of this Memo
     
        This document is an Internet-Draft and is in full conformance with
        all provisions of Section 10 of [RFC2026].
     
        Internet-Drafts are working documents of the Internet Engineering
        Task Force (IETF), its areas, and its working groups. Note that
        other groups may also distribute working documents as Internet-
        Drafts. Internet-Drafts are draft documents valid for a maximum of
        six months and may be updated, replaced, or made obsolete by other
        documents at any time. It is inappropriate to use Internet- Drafts
        as reference material or to cite them other than as "work in
        progress."
     
        The list of current Internet-Drafts can be accessed at
        http://www.ietf.org/ietf/1id-abstracts.txt
     
        The list of Internet-Draft Shadow Directories can be accessed at
        http://www.ietf.org/shadow.html.
     
     Comments
     
        Comments should be sent to the IPS mailing list (ips@ece.cmu.edu) or
        to the authors.
     
                                 Table of Contents
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     Monia, et-al               Standards Track                   [Page 1]
     

     DHCP Option Number for iSNS Revision 5                   February 2003
     
     Status of this Memo...................................................1
     Comments..............................................................1
     Abstract..............................................................3
     Conventions used in this document.....................................3
     1.Introduction.......................................................3
     2.iSNS Option for DHCP...............................................4
     2.1 iSNS Functions Field.............................................5
     2.2 Discovery Domain Access Field....................................6
     2.3 Administrative Flags Field.......................................7
     2.4 iSNS Server Security Bitmap......................................9
     3.Security Considerations...........................................10
     4.Normative References..............................................10
     5.Non-Normative References..........................................11
     6.Author's Addresses................................................11
     Full Copyright Statement.............................................12
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     Monia, et-al               Standards Track                   [Page 2]
     

     DHCP Option Number for iSNS Revision 5                   February 2003
     
     Abstract
     
        This document describes the DHCP option to allow iSNS clients using
        DHCP for IPv4 to automatically discover the location of the iSNS
        server. iSNS provides discovery and management capabilities for
        iSCSI and Fibre Channel storage devices in an enterprise-scale IP
        storage network.  iSNS provides intelligent storage management
        services comparable to those found in Fibre Channel networks,
        allowing a commodity IP network to function in a similar capacity as
        a storage area network.
     
     Conventions used in this document
     
        iSNS refers to the framework consisting of the storage network model
        and associated services.
     
        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].
     
        All frame formats are in big endian network byte order.  RESERVED
        fields SHOULD be set to zero.
     
        This document uses the following terms:
     
        "iSNS Client" - iSNS clients are processes resident in iSCSI and
        iFCP devices that initiate transactions with the iSNS server using
        the iSNS Protocol.
     
        "iSNS Server" - The iSNS server responds to iSNS protocol query and
        registration messages, and initiates asynchronous notification
        messages.  The iSNS server stores information registered by iSNS
        clients.
     
        "iSCSI (Internet SCSI)" - iSCSI is an encapsulation of SCSI for a
        new generation of storage devices interconnected with TCP/IP.
     
        "iFCP (Internet Fibre Channel Protocol)" - iFCP is a gateway-to-
        gateway protocol designed to interconnect existing Fibre Channel
        devices using TCP/IP.  iFCP maps the Fibre Channel transport and
        fabric services to TCP/IP.
     
     1.       Introduction
     
        The Dynamic Host Configuration Protocol for Ipv4 provides a
        framework for passing configuration information to hosts.  Its
        usefulness extends to hosts and devices using the iSCSI and iFCP
        protocols to connect to block level storage assets over a TCP/IP
        network.
     
        The iSNS Protocol provides a framework for automated discovery,
        management, and configuration of iSCSI and iFCP devices on a TCP/IP
        network.  It provides functionality similar to that found on Fibre
        Channel networks, except that iSNS works within the context of an IP
     
     Monia, et-al               Standards Track                   [Page 3]
     

     DHCP Option Number for iSNS Revision 5                   February 2003
     
        network.  iSNS thereby provides the requisite storage intelligence
        to IP networks that are standard on existing Fibre Channel networks.
     
        Existing DHCP option numbers are not plausible due to the following
        reasons:
     
         a) iSNS functionality is distinctly different from other protocols
            using existing DHCP option numbers.  Specifically, iSNS provides
            a significant superset of capabilities compared to typical name
            resolution protocols such as DNS.  It is designed to support
            client devices that allow themselves to be configured and
            managed from a central iSNS server
     
         b) iSNS requires a DHCP option format that provides more than the
            location of the iSNS server.  The DHCP option number needs to
            specify the subset of iSNS services that will be actively used
            by the iSNS client.
     
        The DHCP option number for iSNS is used by iSCSI and iFCP devices to
        discover the location and role of the iSNS server.  The DHCP option
        number assigned for iSNS by IANA is <<TBD>>.
     
     2.       iSNS Option for DHCP
     
        This option specifies the location of the primary and backup iSNS
        servers and the iSNS services available to an iSNS client.
     
         0                   1                   2                   3
         0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        |   Code = TBD  |    Length     |          iSNS Functions       |
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        |           DD Access           |     Administrative FLAGS      |
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        |                 iSNS Server Security Bitmap                   |
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        |      a1       |       a2      |       a3      |       a4      |
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        |      b1       |       b2      |       b3      |       b4      |
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        |                            . . . .                            |
        |                 Additional Secondary iSNS Servers             |
        |                            . . . .                            |
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                           Figure 1 -- iSNS Server Option
     
        The iSNS Option specifies a list of IP addresses used by iSNS
        servers. The option contains the following parameters:
     
        Length: the number of bytes that follow the Length field.  The
                minimum value for the Length field is 6 in order to account
                for the iSNS Functions, Discovery Domain Access, and
                Administrative Flags fields.
     
     
     Monia, et-al               Standards Track                   [Page 4]
     

     DHCP Option Number for iSNS Revision 5                   February 2003
     
        iSNS Functions: A bitmapped field defining the functions supported
                by the iSNS servers.  The format of this field is described
                in section 2.1.
     
        Discovery Domain Access: A bit field indicating the types of iSNS
                clients that are allowed to modify Discovery Domains. The
                field contents are described in section 2.2.
     
        Administrative Flags field: Contains the administrative settings for
                the iSNS servers discovered through the DHCP query.  The
                contents of this field are described in section 2.3.
     
        iSNS Server Security Bitmap: Contains the iSNS server security
                settings specified in section 2.4.
     
        a1...a4: Depending on the setting of the Heartbeat bit in the
                Administrative Flags field (see section 2.3), this field
                contains either the IP address from which the iSNS heartbeat
                originates (see [ISNS]) or the IP address of the primary
                iSNS server.
     
        b1...b4: Depending on the setting of Heartbeat bit in the
                Administrative Flags field (see section 2.3), this field
                contains either the IP address of the primary iSNS server or
                a secondary iSNS server.
     
        Additional Secondary iSNS Servers: Each set of four octets specifies
                the IP address of a secondary iSNS server.
     
     2.1      iSNS Functions Field
     
        The iSNS Functions Field defines the iSNS server's operational role
        (i.e., how the iSNS server is to be used).  The iSNS server's role
        can be as basic as providing simple discovery information, or as
        significant as providing IKE/IPSec security policies and
        certificates for the use of iSCSI and iFCP devices. The format of
        the iSNS Role bit field is shown in Figure 2:
     
                       1       2                   3
                       6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
                     +--+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                     |Vendor-Specific |RESERVED |S|A|E|
                     +--+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                     Figure 2 -- iSNS Functions
     
     
     
     
     
     
     
     
     
     
     
     Monia, et-al               Standards Track                   [Page 5]
     

     DHCP Option Number for iSNS Revision 5                   February 2003
     
                Bit field     Significance
                ---------     ------------
                31            Function Fields Enabled
                30            DD-Based Authorization
                29            Security policy distribution
                28 - 24       Reserved
                23 - 16       Vendor-specific
     
                Enabled:        This bit specifies the validity of the
                                 remaining iSNS Function fields.  If set to
                                 one, then the contents of all other iSNS
                                 Function fields are valid.  If set to zero,
                                 then the contents of all other iSNS
                                 Function fields MUST be ignored.
     
                DD-based        Indicates whether or not devices in a
                Authorization:  common Discovery Domain (DD) are implicitly
                                 authorized to access one another. Although
                                 Discovery Domains control the scope of
                                 device discovery, they do not necessarily
                                 indicate whether or not a domain member is
                                 authorized to access discovered devices.
                                 If this bit is set to one, then devices in
                                 a common Discovery Domain are automatically
                                 allowed access to each other (if
                                 successfully authenticated).  If this bit
                                 is set to zero, then access authorization
                                 is not implied by domain membership and
                                 must be explicitly performed by each
                                 device. In either case, devices not in a
                                 common discovery domain are not allowed to
                                 access each other.
     
                Security:       Indicates whether the iSNS client is to
                                 download and use the security policy
                                 configuration stored in the iSNS server.
                                 If set to one, then the policy is stored in
                                 the iSNS server and must be used by the
                                 iSNS client for its own security policy.
                                 If set to zero, then the iSNS client must
                                 obtain its security policy configuration by
                                 other means.
     
                Vendor-         These bits are used to indicate the vendor-
                Specific:       specific capabilities supported by the
                                 indicated iSNS server.
     
     
     
     2.2      Discovery Domain Access Field
     
        The format of the DD Access bit field is shown in Figure 3:
     
     
     
     Monia, et-al               Standards Track                   [Page 6]
     

     DHCP Option Number for iSNS Revision 5                   February 2003
     
                       0   1   2   3   4   5   6  ... 15
                     +---+---+---+---+---+---+---+---+---+
                     | if| tf| is| ts| C | E |  Reserved |
                     +---+---+---+---+---+---+---+---+---+
                       Figure 3 -- Discovery Domain Access
     
                 Bit field  Significance
                 ---------  ------------
                      0      iFCP Initiator Port
                      1      iFCP Target Port
                      2      iSCSI Initiator
                      3      iSCSI Target
                      4      Control Node
                      5      Enabled
                  6 ... 15  Reserved
     
     
                Enabled:           This bit specifies the validity of the
                                   remaining DD Access bit fields.  If this
                                   bit is set to one, then the contents of
                                   the remainder of the DD Access field are
                                   valid.  If this bit is set to zero, then
                                   the contents of the remainder of this
                                   field MUST be ignored.
     
                Control Node:      Specifies whether the iSNS server allows
                                   Discovery Domains to be added, modified
                                   or deleted by means of Control Nodes. If
                                   set to one, then Control Nodes are
                                   allowed to modify the Discovery Domain
                                   configuration.  If set to zero, then
                                   Control Nodes are not allowed to modify
                                   Discovery Domain configurations.
     
                iSCSI Target,      These bits determine whether the
                iSCSI Initiator,   respective registered iSNS client
                iFCP Target Port,  (determined by iSCSI Node Type or iFCP
                iFCP Initiator     Port Role) is allowed to add, delete, or
                Port:              modify Discovery Domains.  If set to
                                   one, then modification by the specified
                                   client type is allowed. If set to zero,
                                   then modification by the specified
                                   client type is not allowed.
     
                                   (A node may implement multiple node
                                   types.)
     
     
     
     2.3      Administrative Flags Field
     
        The format of the Administrative Flags bit field is shown in
        Figure 4:
     
     
     Monia, et-al               Standards Track                   [Page 7]
     

     DHCP Option Number for iSNS Revision 5                   February 2003
     
                           1       2                   3
                           6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
                          +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                          |    RESERVED           |D|M|H|E|
                          +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                           Figure 4 -- Administrative Flags
     
                         Bit Field         Significance
                         ---------         ------------
                             31             Enabled
                             30             Heartbeat
                             29             Management SCNs
                             28             Default Discovery Domain
                          27 - 16          RESERVED
     
     
                Enabled:           Specifies the validity of the remainder
                                   of the Administrative Flags field.  If
                                   set to one, then the contents of the
                                   remaining Administrative Flags are
                                   valid.  If set to zero, then the
                                   remaining contents MUST be ignored,
                                   indicating that iSNS administrative
                                   settings are obtained through means
                                   other than DHCP.
     
                Heartbeat:         Indicates whether the first IP address
                                   is the multicast address to which the
                                   iSNS heartbeat message is sent.  If set
                                   to one, then a1-a4 contains the
                                   heartbeat multicast address and b1-b4
                                   contains the IP address of the primary
                                   iSNS server, followed by the IP
                                   address(es) of any backup servers.  If
                                   set to zero, then a1-a4 contains the IP
                                   address of the primary iSNS server,
                                   followed by the IP address(es) of any
                                   backup servers.
     
                Management SCNs:   Indicates whether control nodes are
                                   authorized to register to receive
                                   Management State Change Notifications
                                   (SCN's).  Management SCN's are a special
                                   class of State Change Notification whose
                                   scope is the entire iSNS database.  If
                                   set to one, then control nodes are
                                   authorized to register to receive
                                   Management SCN's.  If set to zero, then
                                   control nodes are not authorized to
                                   receive Management SCN's (although they
                                   may receive normal SCN's).
     
     
     
     
     Monia, et-al               Standards Track                   [Page 8]
     

     DHCP Option Number for iSNS Revision 5                   February 2003
     
                Default Discovery  Indicates whether a newly registered
                Domain:            device that is not explicitly placed
                                   into a Discovery Domain (DD) and
                                   Discovery Domain Set (DDS) should be
                                   automatically placed into a default DD
                                   and DDS.  If set to one, then a default
                                   DD shall contain all devices in the iSNS
                                   database that have not been explicitly
                                   placed into a DD by an iSNS client.  If
                                   set to zero, then devices not explicitly
                                   placed into a DD are not members of any
                                   DD.
     
     
     
     2.4      iSNS Server Security Bitmap
     
        The format of the iSNS server security Bitmap field is shown in
        Figure 5. If valid, this field communicates to the DHCP client the
        security settings that are required to communicate with the
        indicated iSNS server.
     
         0                   1                   2                   3
         0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        |                     Reserved                    |T|X|P|A|M|S|E|
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                      Figure 5 -- iSNS Server Security Bitmap
     
                Bit Field     Significance
                ---------     ----------------
                31            Enabled
                30            IKE/IPSec
                29            Main Mode
                28            Aggressive Mode
                27            PFS
                26            Transport Mode
                25            Tunnel Mode
                24 -- 0       Reserved
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
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     DHCP Option Number for iSNS Revision 5                   February 2003
     
                Enabled          This bit specifies the validity of the
                                  remainder of the iSNS server security
                                  bitmap.  If set to one, then the contents
                                  of the remainder of the field are valid.
                                  If set to zero, then the contents of the
                                  rest of the field are undefined and MUST
                                  be ignored.
     
                IKE/IPSec        1 = IKE/IPSec enabled; 0 = IKE/IPSec
                                  disabled.
     
                Main Mode        1 = Main Mode enabled; 0 = Main Mode
                                  disabled.
     
                Aggressive Mode  1 = Aggressive mode enabled; 0 =
                                  Aggressive mode disabled.
     
                PFS              1 = PFS enabled; 0 = PFS disabled.
     
                Transport Mode   1 = Transport mode preferred; 0 = No
                                  preference.
     
                Tunnel Mode      1 = Tunnel mode preferred; 0 = No
                                  preference.
     
     
     
     3.       Security Considerations
     
        DHCP currently provides no authentication or security mechanisms.
        Potential exposures to attack are discussed in section 7 of the DHCP
        protocol specification [DHCP].
     
        iSNS security considerations are discussed in [iSNS] and [SEC-IPS].
        With regard to security considerations specific to the use of this
        DHCP option to discover the location of the iSNS server, exposure to
        a "man-in-the-middle" attack by an hostile entity modifying or
        replacing the original iSNS option message should be considered a
        potential security exposure.  To prevent an attacker from weakening
        the required security and potentially tricking the iSNS client into
        connecting into rogue iSNS servers, reliance on local security
        policy configuration is an appropriate countermeasure.
     
     4.       Normative References
     
            [DHCP]  Droms, R., "Dynamic Host Configuration Protocol", RFC
                    2131, Bucknell University, March 1997.
     
            [RFC2026] Bradner, S., "The Internet Standards Process --
                    Revision 3", BCP 9, RFC 2026, October 1996
     
            [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
                    Requirement Levels", BCP 14, RFC 2119, March 1997
     
     
     Monia, et-al               Standards Track                  [Page 10]
     

     DHCP Option Number for iSNS Revision 5                   February 2003
     
     
     
     5.       Non-Normative References
     
            [iFCP]  Monia, C., et al., "iFCP - A Protocol for Internet Fibre
                    Channel Storage Networking", Internet draft (work in
                    progress), draft-ietf-ips-ifcp-13.txt, May 2002
     
            [iSCSI] Satran, J., et al., "iSCSI", Internet draft (work in
                    progress), draft-ietf-ips-iSCSI-15.txt, August 2002
     
            [iSNS]  Tseng, J. et al., "iSNS - Internet Storage Name
                    Service", Internet draft (work in progress), draft-ietf-
                    ips-isns-12.txt, August 2002
     
            [SEC-IPS] Aboba, B., et al., "Securing IP Block Storage
                    Protocols", draft-ietf-ips-security-14.txt, June 2002
     
     
     
     6.       Author's Addresses
     
        Kevin Gibbons,
        Charles Monia,
        Josh Tseng
     
        Nishan Systems
        3850 North First Street
        San Jose, CA 95134-1702
        Phone: (408) 519-3700
        Email: cmonia@nishansystems.com
               jtseng@nishansystems.com
               kgibbons@nishansystems.com
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     Monia, et-al               Standards Track                  [Page 11]
     

     Full Copyright Statement
     
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