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I2NSF Working Group                                        S. Hares, Ed.
Internet-Draft                                                    Huawei
Intended status: Standards Track                           J. Jeong, Ed.
Expires: May 6, 2021                                              J. Kim
                                                 Sungkyunkwan University
                                                            R. Moskowitz
                                                          HTT Consulting
                                                                  Q. Lin
                                                                  Huawei
                                                        November 2, 2020


                    I2NSF Capability YANG Data Model
               draft-ietf-i2nsf-capability-data-model-13

Abstract

   This document defines an information model and the corresponding YANG
   data model for the capabilities of various Network Security Functions
   (NSFs) in the Interface to Network Security Functions (I2NSF)
   framework to centrally manage the capabilities of the various NSFs.

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 https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted 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."

   This Internet-Draft will expire on May 6, 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents



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   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Capability Information Model Design . . . . . . . . . . . . .   4
     3.1.  Design Principles and ECA Policy Model Overview . . . . .   5
     3.2.  Matched Policy Rule . . . . . . . . . . . . . . . . . . .   8
     3.3.  Conflict, Resolution Strategy and Default Action  . . . .   8
   4.  Overview of YANG Data Model . . . . . . . . . . . . . . . . .  10
   5.  YANG Tree Diagram . . . . . . . . . . . . . . . . . . . . . .  12
     5.1.  Network Security Function (NSF) Capabilities  . . . . . .  12
   6.  YANG Data Model of I2NSF NSF Capability . . . . . . . . . . .  15
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  46
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  47
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  47
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  47
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  50
   Appendix A.  Configuration Examples . . . . . . . . . . . . . . .  52
     A.1.  Example 1: Registration for the Capabilities of a General
           Firewall  . . . . . . . . . . . . . . . . . . . . . . . .  52
     A.2.  Example 2: Registration for the Capabilities of a Time-
           based Firewall  . . . . . . . . . . . . . . . . . . . . .  54
     A.3.  Example 3: Registration for the Capabilities of a Web
           Filter  . . . . . . . . . . . . . . . . . . . . . . . . .  55
     A.4.  Example 4: Registration for the Capabilities of a
           VoIP/VoLTE Filter . . . . . . . . . . . . . . . . . . . .  56
     A.5.  Example 5: Registration for the Capabilities of a HTTP
           and HTTPS Flood Mitigator . . . . . . . . . . . . . . . .  57
   Appendix B.  Acknowledgments  . . . . . . . . . . . . . . . . . .  58
   Appendix C.  Contributors . . . . . . . . . . . . . . . . . . . .  59
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  61

1.  Introduction

   As the industry becomes more sophisticated and network devices (e.g.,
   Internet of Things, Self-driving vehicles, and smartphone using Voice
   over IP (VoIP) and Voice over LTE (VoLTE)) requires advanced security
   protection in various scenario, service providers have a lot of
   problems described in [RFC8192].  To resolve these problems, this
   document specifies the information and data model of the capabilities
   of Network Security Functions (NSFs) in a framework of the Interface
   to Network Security Functions (I2NSF) [RFC8329].



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   NSFs produced by multiple security vendors provide various security
   capabilities to customers.  Multiple NSFs can be combined together to
   provide security services over the given network traffic, regardless
   of whether the NSFs are implemented as physical or virtual functions.
   Security Capabilities describe the functions that Network Security
   Functions (NSFs) are available to provide for security policy
   enforcement purposes.  Security Capabilities are independent of the
   actual security control mechanisms that will implement them.

   Every NSF SHOULD be described with the set of capabilities it offers.
   Security Capabilities enable security functionality to be described
   in a vendor-neutral manner.  That is, it is not needed to refer to a
   specific product or technology when designing the network; rather,
   the functions characterized by their capabilities are considered.
   Security Capabilities are a market enabler, providing a way to define
   customized security protection by unambiguously describing the
   security features offered by a given NSF.

   This document provides an information model and the corresponding
   YANG data model [RFC6020][RFC7950] that defines the capabilities of
   NSFs to centrally manage the capabilities of those security devices.
   The security devices can register their own capabilities into a
   Network Operator Management (Mgmt) System (i.e., Security Controller)
   with this YANG data model through the registration interface
   [RFC8329].  With the database of the capabilities of those security
   devices maintained centrally, those security devices can be more
   easily managed [RFC8329].

   This YANG data model uses an "Event-Condition-Action" (ECA) policy
   model that is used as the basis for the design of I2NSF Policy as
   described in [RFC8329] and Section 3.1.  The "ietf-i2nsf-capability"
   YANG module defined in this document provides the following features:

   o  Definition for time capabilities of network security functions.

   o  Definition for event capabilities of generic network security
      functions.

   o  Definition for condition capabilities of generic network security
      functions.

   o  Definition for condition capabilities of advanced network security
      functions.

   o  Definition for action capabilities of generic network security
      functions.





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   o  Definition for resolution strategy capabilities of generic network
      security functions.

   o  Definition for default action capabilities of generic network
      security functions.

2.  Terminology

   This document uses the terminology described in [RFC8329].

   This document follows the guidelines of [RFC8407], uses the common
   YANG types defined in [RFC6991], and adopts the Network Management
   Datastore Architecture (NMDA).  The meaning of the symbols in tree
   diagrams is defined in [RFC8340].

3.  Capability Information Model Design

   A Capability Information Model (CapIM) is a formalization of the
   functionality that an NSF advertises.  This enables the precise
   specification of what an NSF can do in terms of security policy
   enforcement, so that computer-based tasks can unambiguously refer to,
   use, configure, and manage NSFs.  Capabilities MUST be defined in a
   vendor- and technology-independent manner (e.g., regardless of the
   differences among vendors and individual products).

   Humans are able to refer to categories of security controls and
   understand each other.  For instance, security experts agree on what
   is meant by the terms "NAT", "filtering", and "VPN concentrator".  As
   a further example, network security experts unequivocally refer to
   "packet filters" as stateless devices able to allow or deny packet
   forwarding based on various conditions (e.g., source and destination
   IP addresses, source and destination ports, and IP protocol type
   fields) [Alshaer].

   However, more information is required in case of other devices, like
   stateful firewalls or application layer filters.  These devices
   filter packets or communications, but there are differences in the
   packets and communications that they can categorize and the states
   they maintain.  Humans deal with these differences by asking more
   questions to determine the specific category and functionality of the
   device.  Machines can follow a similar approach, which is commonly
   referred to as question-answering [Hirschman] [Galitsky].  In this
   context, the CapIM and the derived Data Models provide important and
   rich information sources.

   Analogous considerations can be applied for channel protection
   protocols, where we all understand that they will protect packets by
   means of symmetric algorithms whose keys could have been negotiated



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   with asymmetric cryptography, but they may work at different layers
   and support different algorithms and protocols.  To ensure
   protection, these protocols apply integrity, optionally
   confidentiality, anti-reply protections, and authenticate peers.

   The CapIM is intended to clarify these ambiguities by providing a
   formal description of NSF functionality.  The set of functions that
   are advertised MAY be restricted according to the privileges of the
   user or application that is viewing those functions.  I2NSF
   Capabilities enable unambiguous specification of the security
   capabilities available in a (virtualized) networking environment, and
   their automatic processing by means of computer-based techniques.

   This includes enabling the security controller to properly identify
   and manage NSFs, and allow NSFs to properly declare their
   functionality, so that they can be used in the correct way.

3.1.  Design Principles and ECA Policy Model Overview

   This document defines an information model for representing NSF
   capabilities.  Some basic design principles for security capabilities
   and the systems that manage them are:

   o  Independence: each security capability SHOULD be an independent
      function, with minimum overlap or dependency on other
      capabilities.  This enables each security capability to be
      utilized and assembled together freely.  More importantly, changes
      to one capability SHOULD NOT affect other capabilities.  This
      follows the Single Responsibility Principle [Martin] [OODSRP].

   o  Abstraction: each capability MUST be defined in a vendor-
      independent manner.

   o  Advertisement: A dedicated, well-known interface MUST be used to
      advertise and register the capabilities of each NSF.  This same
      interface MUST be used by other I2NSF Components to determine what
      Capabilities are currently available to them.

   o  Execution: a dedicated, well-known interface MUST be used to
      configure and monitor the use of a capability.  This provides a
      standardized ability to describe its functionality, and report its
      processing results.  This facilitates multi-vendor
      interoperability.

   o  Automation: the system MUST have the ability to auto-discover,
      auto-negotiate, and auto-update its security capabilities (i.e.,
      without human intervention).  These features are especially useful
      for the management of a large number of NSFs.  They are essential



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      for adding smart services (e.g., refinement, analysis, capability
      reasoning, and optimization) to the security scheme employed.
      These features are supported by many design patterns, including
      the Observer Pattern [OODOP], the Mediator Pattern [OODMP], and a
      set of Message Exchange Patterns [Hohpe].

   o  Scalability: the management system SHOULD have the capability to
      scale up/down or scale in/out.  Thus, it can meet various
      performance requirements derived from changeable network traffic
      or service requests.  In addition, security capabilities that are
      affected by scalability changes SHOULD support reporting
      statistics to the security controller to assist its decision on
      whether it needs to invoke scaling or not.

   Based on the above principles, this document defines a capability
   model that enables an NSF to register (and hence advertise) its set
   of capabilities that other I2NSF Components can use.  These
   capabilities MAY have their access control restricted by policy; this
   is out of scope for this document.  The set of capabilities provided
   by a given set of NSFs unambiguously define the security offered by
   the set of NSFs used.  The security controller can compare the
   requirements of users and applications to the set of capabilities
   that are currently available in order to choose which capabilities of
   which NSFs are needed to meet those requirements.  Note that this
   choice is independent of vendor, and instead relies specifically on
   the capabilities (i.e., the description) of the functions provided.

   Furthermore, when an unknown threat (e.g., zero-day exploits and
   unknown malware) is reported by an NSF, new capabilities may be
   created, and/or existing capabilities may be updated (e.g., by
   updating its signature and algorithm).  This results in enhancing the
   existing NSFs (and/or creating new NSFs) to address the new threats.
   New capabilities may be sent to and stored in a centralized
   repository, or stored separately in a vendor's local repository.  In
   either case, a standard interface facilitates the update process.
   This document specifies a metadata model that MAY be used to further
   describe and/or prescribe the characteristics and behavior of the
   I2NSF capability model.  For example, in this case, metadata could be
   used to describe the updating of the capability, and prescribe the
   particular version that an implementation should use.  This initial
   version of the model covers and has been validated to describe NSFs
   that are designed with a set of capabilities (which covers most of
   the existing NSFs).  Checking the behavior of the model with systems
   that change capabilities dynamically at runtime has been extensively
   explored (e.g., impact on automatic registration).

   The "Event-Condition-Action" (ECA) policy model in [RFC8329] is used
   as the basis for the design of the capability model; definitions of



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   all I2NSF policy-related terms are also defined in
   [I-D.ietf-i2nsf-terminology].  The following three terms define the
   structure and behavior of an I2NSF imperative policy rule:

   o  Event: An Event is defined as any important occurrence in time of
      a change in the system being managed, and/or in the environment of
      the system being managed.  When used in the context of I2NSF
      Policy Rules, it is used to determine whether the Condition clause
      of the I2NSF Policy Rule can be evaluated or not.  Examples of an
      I2NSF Event include time and user actions (e.g., logon, logoff,
      and actions that violate an ACL).

   o  Condition: A condition is defined as a set of attributes,
      features, and/or values that are to be compared with a set of
      known attributes, features, and/or values in order to determine
      whether or not the set of Actions in that (imperative) I2NSF
      Policy Rule can be executed or not.  Examples of I2NSF Conditions
      include matching attributes of a packet or flow, and comparing the
      internal state of an NSF to a desired state.

   o  Action: An action is used to control and monitor aspects of flow-
      based NSFs when the event and condition clauses are satisfied.
      NSFs provide security functions by executing various Actions.
      Examples of I2NSF Actions include providing intrusion detection
      and/or protection, web and flow filtering, and deep packet
      inspection for packets and flows.

   An I2NSF Policy Rule is made up of three Boolean clauses: an Event
   clause, a Condition clause, and an Action clause.  This structure is
   also called an ECA (Event-Condition-Action) Policy Rule.  A Boolean
   clause is a logical statement that evaluates to either TRUE or FALSE.
   It may be made up of one or more terms; if more than one term is
   present, then each term in the Boolean clause is combined using
   logical connectives (i.e., AND, OR, and NOT).

   An I2NSF ECA Policy Rule has the following semantics:

      IF <event-clause> is TRUE

         IF <condition-clause> is TRUE

            THEN execute <action-clause> [constrained by metadata]

         END-IF

      END-IF





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   Technically, the "Policy Rule" is really a container that aggregates
   the above three clauses, as well as metadata.  Aggregating metadata
   enables business logic to be used to prescribe behavior.  For
   example, suppose a particular ECA Policy Rule contains three actions
   (A1, A2, and A3, in that order).  Action A2 has a priority of 10;
   actions A1 and A3 have no priority specified.  Then, metadata may be
   used to restrict the set of actions that can be executed when the
   event and condition clauses of this ECA Policy Rule are evaluated to
   be TRUE; two examples are: (1) only the first action (A1) is
   executed, and then the policy rule returns to its caller, or (2) all
   actions are executed, starting with the highest priority.

   The above ECA policy model is very general and easily extensible.

3.2.  Matched Policy Rule

   The concept of a "matched" policy rule is defined as one in which its
   event and condition clauses both evaluate to true.  To precisely
   describe what an NSF can do in terms of security, the things need to
   describe are the events it can catch, the conditions it can evaluate,
   and the actions it can enforce.

   Therefore, the properties that to characterize the capabilities of a
   NSF are as below:

   o  Ac is the set of Actions currently available from the NSF;

   o  Ec is the set of Events that an NSF can catch.  Note that for NSF
      (e.g., a packet filter) that are not able to react to events, this
      set will be empty;

   o  Cc is the set of Conditions currently available from the NSF;

   o  EVc defines the set of Condition Clause Evaluation Rules that can
      be used at the NSF to decide when the Condition Clause is true
      given the result of the evaluation of the individual Conditions.

3.3.  Conflict, Resolution Strategy and Default Action

   Formally, two I2NSF Policy Rules conflict with each other if:

   o  the Event Clauses of each evaluate to TRUE;

   o  the Condition Clauses of each evaluate to TRUE;

   o  the Action Clauses affect the same object in different ways.

   For example, if we have two Policy Rules in the same Policy:



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      R1: During 8am-6pm, if traffic is external, then run through FW

      R2: During 7am-8pm, conduct anti-malware investigation

   There is no conflict between R1 and R2, since the actions are
   different.  However, consider these two rules:

      R3: During 8am-6pm, John gets GoldService

      R4: During 10am-4pm, FTP from all users gets BronzeService

   R3 and R4 are now in conflict, between the hours of 10am and 4pm,
   because the actions of R3 and R4 are different and apply to the same
   user (i.e., John).

   Conflicts theoretically compromise the correct functioning of devices
   (as happened for routers several year ago).  However, NSFs have been
   designed to cope with these issues.  Since conflicts are originated
   by simultaneously matching rules, an additional process decides the
   action to be applied, e.g., among the ones the matching rule would
   have enforced.  This process is described by means of a resolution
   strategy

   On the other hand, it may happen that, if an event is caught, none of
   the policy rules matches.  As a simple case, no rules may match a
   packet arriving at border firewall.  In this case, the packet is
   usually dropped, that is, the firewall has a default behavior to
   manage cases that are not covered by specific rules.

   Therefore, we introduce another security capability that serves to
   characterize valid policies for an NSF that solve conflicts with
   resolution strategies and enforce default actions if no rules match:

   o  RSc is the set of Resolution Strategy that can be used to specify
      how to resolve conflicts that occur between the actions of the
      same or different policy rules that are matched and contained in
      this particular NSF;

   o  Dc defines the notion of a Default action.  This action can be
      either an explicit action that has been chosen {a}, or a set of
      actions {F}, where F is a dummy symbol (i.e., a placeholder value)
      that can be used to indicate that the default action can be freely
      selected by the policy editor.  This is denoted as {F} U {a}.








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4.  Overview of YANG Data Model

   This section provides as overview of how the YANG data model can be
   used in the I2NSF framework described in [RFC8329].  Figure 1 shows
   the capabilities (e.g., firewall and web filter) of NSFs in the I2NSF
   Framework.  As shown in this figure, an NSF Developer's Management
   System can register NSFs and the capabilities that the network
   security devices can support.  To register NSFs in this way, the
   Developer's Management System utilizes this standardized capability
   YANG data model through the I2NSF Registration Interface [RFC8329].
   That is, this Registration Interface uses the YANG module described
   in this document to describe the capabilities of a network security
   function that is registered with the Security Controller.  With the
   capabilities of those network security devices maintained centrally,
   those security devices can be more easily managed, which can resolve
   many of the problems described in [RFC8192].

   In Figure 1, a new NSF at a Developer's Management Systems has
   capabilities of Firewall (FW) and Web Filter (WF), which are denoted
   as (Cap = {FW, WF}), to support Event-Condition-Action (ECA) policy
   rules where 'E', 'C', and 'A' mean "Event", "Condition", and
   "Action", respectively.  The condition involves IPv4 or IPv6
   datagrams, and the action includes "Allow" and "Deny" for those
   datagrams.

   Note that the NSF-Facing Interface [RFC8329] is used to configure the
   security policy rules of the generic network security functions, and
   the configuration of advanced security functions over the NSF-Facing
   Interface is used to configure the security policy rules of advanced
   network security functions (e.g., anti-virus and Distributed-Denial-
   of-Service (DDoS) attack mitigator), respectively, according to the
   capabilities of NSFs registered with the I2NSF Framework.



















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       +------------------------------------------------------+
       |  I2NSF User (e.g., Overlay Network Mgmt, Enterprise  |
       |  Network Mgmt, another network domain's mgmt, etc.)  |
       +--------------------+---------------------------------+
           I2NSF            ^
  Consumer-Facing Interface |
                            |
                            v                  I2NSF
          +-----------------+------------+  Registration  +-------------+
          | Network Operator Mgmt System |   Interface    | Developer's |
          | (i.e., Security Controller)  |<-------------->| Mgmt System |
          +-----------------+------------+                +-------------+
                            ^                                 New NSF
                            |                           Cap = {FW, WF}
              I2NSF         |                           E = {}
       NSF-Facing Interface |                           C = {IPv4, IPv6}
                            |                           A = {Allow, Deny}
                            v
       +---------------+----+------------+-----------------+
       |               |                 |                 |
   +---+---+       +---+---+         +---+---+         +---+---+
   | NSF-1 |  ...  | NSF-m |         | NSF-1 |   ...   | NSF-n |
   +-------+       +-------+         +-------+         +-------+
     NSF-1           NSF-m             NSF-1             NSF-n
 Cap = {FW, WF}    Cap = {FW, WF}    Cap = {FW, WF}    Cap = {FW, WF}
 E = {}            E = {user}        E = {dev}         E = {time}
 C = {IPv4}        C = {IPv6}        C = {IPv4, IPv6}  C = {IPv4}
 A = {Allow, Deny} A = {Allow, Deny} A = {Allow, Deny} A = {Allow, Deny}

   Developer's Mgmt System A           Developer's Mgmt System B


             Figure 1: Capabilities of NSFs in I2NSF Framework

   A use case of an NSF with the capabilities of firewall and web filter
   is described as follows.

   o  If a network manager wants to apply security policy rules to block
      malicious users with firewall and web filter, it is a tremendous
      burden for a network administrator to apply all of the needed
      rules to NSFs one by one.  This problem can be resolved by
      managing the capabilities of NSFs in this document.

   o  If a network administrator wants to block malicious users for IPv4
      or IPv6 traffic, he sends a security policy rule to block the
      users to the Network Operator Management System using the I2NSF
      Consumer-Facing Interface.




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   o  When the Network Operator Management System receives the security
      policy rule, it automatically sends that security policy rules to
      appropriate NSFs (i.e., NSF-m in Developer's Management System A
      and NSF-1 in Developer's Management System B) which can support
      the capabilities (i.e., IPv6).  This lets an I2NSF User not
      consider NSFs where the rule is applied.

   o  If NSFs encounter the suspicious IPv4 or IPv6 packets of malicious
      users, they can filter the packets out according to the configured
      security policy rule.  Therefore, the security policy rule against
      the malicious users' packets can be automatically applied to
      appropriate NSFs without human intervention.

5.  YANG Tree Diagram

   This section shows a YANG tree diagram of capabilities of network
   security functions, as defined in the Section 3.

5.1.  Network Security Function (NSF) Capabilities

   This section explains a YANG tree diagram of NSF capabilities and its
   features.  Figure 2 shows a YANG tree diagram of NSF capabilities.
   The NSF capabilities in the tree include time capabilities, event
   capabilities, condition capabilities, action capabilities, resolution
   strategy capabilities, and default action capabilities.  Those
   capabilities can be tailored or extended according to a vendor's
   specific requirements.  Refer to the NSF capabilities information
   model for detailed discussion Section 3.























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   module: ietf-i2nsf-capability
     +--rw nsf* [nsf-name]
        +--rw nsf-name            string
        +--rw time-capabilities*                  enumeration
        +--rw event-capabilities
        |  +--rw system-event-capability*   identityref
        |  +--rw system-alarm-capability*   identityref
        +--rw condition-capabilities
        |  +--rw generic-nsf-capabilities
        |  |  +--rw ipv4-capability*   identityref
        |  |  +--rw icmp-capability*   identityref
        |  |  +--rw ipv6-capability*   identityref
        |  |  +--rw icmpv6-capability*   identityref
        |  |  +--rw tcp-capability*    identityref
        |  |  +--rw udp-capability*    identityref
        |  |  +--rw sctp-capability*    identityref
        |  +--rw advanced-nsf-capabilities
        |  |  +--rw anti-virus-capability*    identityref
        |  |  +--rw anti-ddos-capability*     identityref
        |  |  +--rw ips-capability*          identityref
        |  |  +--rw url-capability*          identityref
        |  |  +--rw voip-volte-capability*   identityref
        |  +--rw context-capabilities*        identityref
        +--rw action-capabilities
        |  +--rw ingress-action-capability*   identityref
        |  +--rw egress-action-capability*    identityref
        |  +--rw log-action-capability*       identityref
        +--rw resolution-strategy-capabilities*   identityref
        +--rw default-action-capabilities*        identityref
        +--rw ipsec-method*                       identityref


      Figure 2: YANG Tree Diagram of Capabilities of Network Security
                                 Functions

   Time capabilities are used to specify the capabilities which describe
   when to execute the I2NSF policy rule.  The time capabilities are
   defined in terms of absolute time and periodic time.  The absolute
   time means the exact time to start or end.  The periodic time means
   repeated time like day, week, or month..

   Event capabilities are used to specify the capabilities that describe
   the event that would trigger the evaluation of the condition clause
   of the I2NSF Policy Rule.  The defined event capabilities are system
   event and system alarm.

   Condition capabilities are used to specify capabilities of a set of
   attributes, features, and/or values that are to be compared with a



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   set of known attributes, features, and/or values in order to
   determine whether or not the set of actions in that (imperative)
   I2NSF policy rule can be executed.  The condition capabilities are
   classified in terms of generic network security functions and
   advanced network security functions.  The condition capabilities of
   generic network security functions are defined as IPv4 capability,
   IPv6 capability, TCP capability, UDP capability, SCTP capability and
   ICMP capability.  The condition capabilities of advanced network
   security functions are defined as anti-virus capability, anti-DDoS
   capability, Intrusion Prevention System (IPS) capability, HTTP
   capability, and VoIP/VoLTE capability.  See Section 3.1 for more
   information about the condition in the ECA policy model.

   Action capabilities are used to specify the capabilities that
   describe the control and monitoring aspects of flow-based NSFs when
   the event and condition clauses are satisfied.  The action
   capabilities are defined as ingress-action capability, egress-action
   capability, and log-action capability.  See Section 3.1 for more
   information about the action in the ECA policy model.  Also, see
   Section 7.2 (NSF-Facing Flow Security Policy Structure) in [RFC8329]
   for more information about the ingress and egress actions.  In
   addition, see Section 9.1 (Flow-Based NSF Capability
   Characterization) in [RFC8329] for more information about logging at
   NSFs.

   Resolution strategy capabilities are used to specify the capabilities
   that describe conflicts that occur between the actions of the same or
   different policy rules that are matched and contained in this
   particular NSF.  The resolution strategy capabilities are defined as
   First Matching Rule (FMR), Last Matching Rule (LMR), Prioritized
   Matching Rule (PMR), Prioritized Matching Rule with Errors (PMRE),
   and Prioritized Matching Rule with No Errors (PMRN).  See Section 3.3
   for more information about the resolution strategy.

   Default action capabilities are used to specify the capabilities that
   describe how to execute I2NSF policy rules when no rule matches a
   packet.  The default action capabilities are defined as pass, drop,
   alert, and mirror.  See Section 3.3 for more information about the
   default action.

   IPsec method capabilities are used to specify capabilities of how to
   support an Internet Key Exchange (IKE) [RFC7296] for the security
   communication.  The default action capabilities are defined as IKE or
   IKE-less.  See [I-D.ietf-i2nsf-sdn-ipsec-flow-protection] for more
   information about the SDN-based IPsec flow protection in I2NSF.






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6.  YANG Data Model of I2NSF NSF Capability

   This section introduces a YANG module for NSFs' capabilities, as
   defined in the Section 3.

   This YANG module imports from [RFC6991].  It makes references to [RFC
   0768][IANA-Protocol-Numbers][RFC0791][RFC0792][RFC0793][RFC3261][RFC4
   443][RFC4960][RFC8200][RFC8329][I-D.ietf-i2nsf-nsf-monitoring-data-mo
   del][I-D.ietf-i2nsf-sdn-ipsec-flow-protection].

 <CODE BEGINS> file "ietf-i2nsf-capability@2020-11-02.yang"

 module ietf-i2nsf-capability {
   yang-version 1.1;
   namespace
     "urn:ietf:params:xml:ns:yang:ietf-i2nsf-capability";
   prefix
     nsfcap;


   organization
     "IETF I2NSF (Interface to Network Security Functions)
      Working Group";

   contact
     "WG Web: <http://tools.ietf.org/wg/i2nsf>
      WG List: <mailto:i2nsf@ietf.org>

      Editor: Jaehoon Paul Jeong
      <mailto:pauljeong@skku.edu>

      Editor: Jinyong Tim Kim
      <mailto:timkim@skku.edu>

      Editor: Susan Hares
      <mailto:shares@ndzh.com>";

   description
     "This module is a YANG module for I2NSF Network Security
      Functions (NSFs)'s Capabilities.

      Copyright (c) 2020 IETF Trust and the persons identified as
      authors of the code. All rights reserved.

      Redistribution and use in source and binary forms, with or
      without modification, is permitted pursuant to, and subject
      to the license terms contained in, the Simplified BSD License
      set forth in Section 4.c of the IETF Trust's Legal Provisions



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      Relating to IETF Documents
      http://trustee.ietf.org/license-info).

      This version of this YANG module is part of RFC XXXX; see
      the RFC itself for full legal notices.";

   // RFC Ed.: replace XXXX with an actual RFC number and remove
   // this note.

   revision "2020-11-02"{
     description "Initial revision.";
     reference
       "RFC XXXX: I2NSF Capability YANG Data Model";

     // RFC Ed.: replace XXXX with an actual RFC number and remove
     // this note.
   }

   /*
    * Identities
    */

   identity event {
     description
       "Base identity for I2NSF events.";
     reference
       "draft-ietf-i2nsf-nsf-monitoring-data-model-04: I2NSF NSF
        Monitoring YANG Data Model - Event";

     // RFC Ed.: replace the above draft with an actual RFC in the
     // YANG module and remove this note.
   }

   identity system-event-capability {
     base event;
     description
       "Identity for system event";
     reference
       "draft-ietf-i2nsf-nsf-monitoring-data-model-04: I2NSF NSF
        Monitoring YANG Data Model - System event";
   }

   identity system-alarm-capability {
     base event;
     description
       "Identity for system alarm";
     reference
       "draft-ietf-i2nsf-nsf-monitoring-data-model-04: I2NSF NSF



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        Monitoring YANG Data Model - System alarm";
   }

   identity access-violation {
     base system-event-capability;
     description
       "Identity for access violation event";
     reference
       "draft-ietf-i2nsf-nsf-monitoring-data-model-04: I2NSF NSF
        Monitoring YANG Data Model - System event for access
        violation";
   }

   identity configuration-change {
     base system-event-capability;
     description
       "Identity for configuration change event";
     reference
       "draft-ietf-i2nsf-nsf-monitoring-data-model-04: I2NSF NSF
        Monitoring YANG Data Model - System event for configuration
        change";
   }

   identity memory-alarm {
     base system-alarm-capability;
     description
       "Identity for memory alarm. Alarm when memory usage
       exceed the threshold.";
     reference
       "draft-ietf-i2nsf-nsf-monitoring-data-model-04: I2NSF NSF
        Monitoring YANG Data Model - System alarm for memory";
   }

   identity cpu-alarm {
     base system-alarm-capability;
     description
       "Identity for CPU alarm. Alarm when CPU usage
       exceed the threshold.";
     reference
       "draft-ietf-i2nsf-nsf-monitoring-data-model-04: I2NSF NSF
        Monitoring YANG Data Model - System alarm for CPU";
   }

   identity disk-alarm {
     base system-alarm-capability;
     description
       "Identity for disk alarm. Alarm when disk usage
       exceed the threshold.";



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     reference
       "draft-ietf-i2nsf-nsf-monitoring-data-model-04: I2NSF NSF
        Monitoring YANG Data Model - System alarm for disk";
   }

   identity hardware-alarm {
     base system-alarm-capability;
     description
       "Identity for hardware alarm. Alarm when a hardware failure
       occur.";
     reference
       "draft-ietf-i2nsf-nsf-monitoring-data-model-04: I2NSF NSF
        Monitoring YANG Data Model - System alarm for hardware";
   }

   identity interface-alarm {
     base system-alarm-capability;
     description
       "Identity for interface alarm";
     reference
       "draft-ietf-i2nsf-nsf-monitoring-data-model-04: I2NSF NSF
        Monitoring YANG Data Model - System alarm for interface";
   }

   identity condition {
     description
       "Base identity for I2NSF conditions";
   }

   identity context-capability {
     base condition;
     description
       "Base identity for context condition capabilities for an NSF.";
   }

   identity access-control-list {
     base context-capability;
     description
       "Identity for Access Control List (ACL) condition capability";
     reference
       "RFC 8519: YANG Data Model for Network Access Control Lists
        (ACLs) - A user-ordered set of rules used to configure the
        forwarding behavior in an NSF.";
   }

   identity application-layer-filter {
     base context-capability;
     description



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       "Identity for application-layer-filter condition capability";
   }

   identity target {
     base context-capability;
     description
       "Identity for target condition capability";
     reference
       "RFC 8519: YANG Data Model for Network Access Control Lists
        (ACLs) - An access control for a target (e.g., the
        corresponding IP address) in an NSF.";
   }

   identity user {
     base context-capability;
     description
       "Identity for user condition capability";
     reference
       "RFC 8519: YANG Data Model for Network Access Control Lists
        (ACLs) - An access control for a user (e.g., the
        corresponding IP address) in an NSF.";
   }

   identity group {
     base context-capability;
     description
       "Identity for group condition capability";
     reference
       "RFC 8519: YANG Data Model for Network Access Control Lists
        (ACLs) - An access control for a group (e.g., the
        corresponding IP addresses) in an NSF.";
   }

   identity geography {
     base context-capability;
     description
       "Identity for geography condition capability";
     reference
       "draft-google-self-published-geofeeds-02: Self-published
        IP Geolocation Data - An access control for a geographical
        location i.e., geolocation (e.g., the corresponding IP
        address).";
   }

   identity ipv4-capability {
     base condition;
     description
       "Base identity for IPv4 condition capability";



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     reference
       "RFC 791: Internet Protocol";
   }

   identity exact-ipv4-header-length {
     base ipv4-capability;
     description
       "Identity for exact-match IPv4 header-length
       condition capability";
     reference
       "RFC 791: Internet Protocol - Header Length";
   }

   identity range-ipv4-header-length {
     base ipv4-capability;
     description
       "Identity for range-match IPv4 header-length
       condition capability";
     reference
       "RFC 791: Internet Protocol - Header Length";
   }

   identity ipv4-tos {
     base ipv4-capability;
     description
       "Identity for IPv4 Type-Of-Service (TOS)
       condition capability";
     reference
       "RFC 791: Internet Protocol - Type of Service";
   }

   identity exact-ipv4-total-length {
     base ipv4-capability;
     description
       "Identity for exact-match IPv4 total length
       condition capability";
     reference
       "RFC 791: Internet Protocol - Total Length";
   }

   identity range-ipv4-total-length {
     base ipv4-capability;
     description
       "Identity for range-match IPv4 total length
       condition capability";
     reference
       "RFC 791: Internet Protocol - Total Length";
   }



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   identity ipv4-id {
     base ipv4-capability;
     description
       "Identity for IPv4 identification condition capability.
        IPv4 ID Field is used for fragmentation";
     reference
       "RFC 791: Internet Protocol - Identification
        RFC 6864: Updated Specification of the IPv4 ID Field";
   }

   identity ipv4-fragment-flags {
     base ipv4-capability;
     description
       "Identity for IPv4 fragment flags condition capability";
     reference
       "RFC 791: Internet Protocol - Fragmentation Flags";
   }

   identity exact-ipv4-fragment-offset {
     base ipv4-capability;
     description
       "Identity for exact-match IPv4 fragment offset
       condition capability";
     reference
       "RFC 791: Internet Protocol - Fragmentation Offset";
   }

   identity range-ipv4-fragment-offset {
     base ipv4-capability;
     description
       "Identity for range-match IPv4 fragment offset
       condition capability";
     reference
       "RFC 791: Internet Protocol - Fragmentation Offset";
   }

   identity exact-ipv4-ttl {
     base ipv4-capability;
     description
       "Identity for exact-match IPv4 Time-To-Live (TTL)
       condition capability";
     reference
       "RFC 791: Internet Protocol - Time To Live (TTL)";
   }

   identity range-ipv4-ttl {
     base ipv4-capability;
     description



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       "Identity for range-match IPv4 Time-To-Live (TTL)
       condition capability";
     reference
       "RFC 791: Internet Protocol - Time To Live (TTL)";
   }

   identity ipv4-protocol {
     base ipv4-capability;
     description
       "Identity for IPv4 protocol condition capability";
     reference
       "IANA Website: Assigned Internet Protocol Numbers
        - Protocol Number for IPv4
        RFC 791: Internet Protocol - Protocol";
   }

   identity exact-ipv4-address {
     base ipv4-capability;
     description
       "Identity for exact-match IPv4 address
       condition capability";
     reference
       "RFC 791: Internet Protocol - Address";
   }

   identity range-ipv4-address {
     base ipv4-capability;
     description
       "Identity for range-match IPv4 address condition
        capability";
     reference
       "RFC 791: Internet Protocol - Address";
   }

   identity ipv4-ip-opts {
     base ipv4-capability;
     description
       "Identity for IPv4 option condition capability";
     reference
       "RFC 791: Internet Protocol - Options";
   }

   identity ipv4-geo-ip {
     base ipv4-capability;
     description
       "Identity for geography condition capability";
   }




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   identity ipv6-capability {
     base condition;
     description
       "Base identity for IPv6 condition capabilities";
     reference
       "RFC 8200: Internet Protocol, Version 6 (IPv6)
       Specification";
   }

   identity ipv6-traffic-class {
     base ipv6-capability;
     description
       "Identity for IPv6 traffic class
       condition capability";
     reference
       "RFC 8200: Internet Protocol, Version 6 (IPv6)
       Specification - Traffic Class";
   }

   identity exact-ipv6-flow-label {
     base ipv6-capability;
     description
       "Identity for exact-match IPv6 flow label
       condition capability";
     reference
       "RFC 8200: Internet Protocol, Version 6 (IPv6)
       Specification - Flow Label
       RFC 6437: IPv6 Flow Label Specification";
   }

   identity range-ipv6-flow-label {
     base ipv6-capability;
     description
       "Identity for range-match IPv6 flow label
       condition capability";
     reference
       "RFC 8200: Internet Protocol, Version 6 (IPv6)
       Specification - Flow Label
       RFC 6437: IPv6 Flow Label Specification";
   }

   identity exact-ipv6-payload-length {
     base ipv6-capability;
     description
       "Identity for exact-match IPv6 payload length
       condition capability";
     reference
       "RFC 8200: Internet Protocol, Version 6 (IPv6)



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       Specification - Payload Length";
   }

   identity range-ipv6-payload-length {
     base ipv6-capability;
     description
       "Identity for range-match IPv6 payload length
       condition capability";
     reference
       "RFC 8200: Internet Protocol, Version 6 (IPv6)
       Specification - Payload Length";
   }

   identity ipv6-next-header {
     base ipv6-capability;
     description
       "Identity for IPv6 next header condition capability";
     reference
       "IANA Website: Assigned Internet Protocol Numbers
        - Protocol Number for IPv6
        RFC 8200: Internet Protocol, Version 6 (IPv6)
        Specification - Next Header";
   }

   identity exact-ipv6-hop-limit {
     base ipv6-capability;
     description
       "Identity for exact-match IPv6 hop limit condition
       capability";
     reference
       "RFC 8200: Internet Protocol, Version 6 (IPv6)
       Specification - Hop Limit";
   }

   identity range-ipv6-hop-limit {
     base ipv6-capability;
     description
       "Identity for range-match IPv6 hop limit condition
       capability";
     reference
       "RFC 8200: Internet Protocol, Version 6 (IPv6)
       Specification - Hop Limit";
   }

   identity exact-ipv6-address {
     base ipv6-capability;
     description
       "Identity for exact-match IPv6 address condition



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        capability";
     reference
       "RFC 8200: Internet Protocol, Version 6 (IPv6)
       Specification - Address";
   }

   identity range-ipv6-address {
     base ipv6-capability;
     description
       "Identity for range-match IPv6 address condition
       capability";
     reference
       "RFC 8200: Internet Protocol, Version 6 (IPv6)
       Specification - Address";
   }

   identity ipv6-header-order {
     base ipv6-capability;
     description
       "Identity for header order IPv6 address condition
       capability";
     reference
       "RFC 8200: Internet Protocol, Version 6 (IPv6)
       Specification - Extension Header Order";
   }

   identity ipv6-options {
     base ipv6-capability;
     description
       "Identity for options IPv6 address condition
       capability";
     reference
       "RFC 8200: Internet Protocol, Version 6 (IPv6)
       Specification - Options";
   }

   identity ipv6-hop-by-hop {
     base ipv6-capability;
     description
       "Identity for hop by hop IPv6 address condition
       capability";
     reference
       "RFC 8200: Internet Protocol, Version 6 (IPv6)
       Specification - Options";
   }

   identity ipv6-routing-header {
     base ipv6-capability;



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     description
       "Identity for routing header IPv6 address condition
       capability";
     reference
       "RFC 8200: Internet Protocol, Version 6 (IPv6)
       Specification - Routing Header";
   }

   identity ipv6-fragment-header {
     base ipv6-capability;
     description
       "Identity for fragment header IPv6 address condition
       capability";
     reference
       "RFC 8200: Internet Protocol, Version 6 (IPv6)
       Specification - Fragment Header";
   }

   identity ipv6-destination-options {
     base ipv6-capability;
     description
       "Identity for destination options IPv6 address condition
       capability";
     reference
       "RFC 8200: Internet Protocol, Version 6 (IPv6)
       Specification - Destination Options";
   }

   identity tcp-capability {
     base condition;
     description
       "Base identity for TCP condition capabilities";
     reference
       "RFC 793: Transmission Control Protocol";
   }

   identity exact-tcp-port-num {
     base tcp-capability;
     description
       "Identity for exact-match TCP port number condition
        capability";
     reference
       "RFC 793: Transmission Control Protocol - Port Number";
   }

   identity range-tcp-port-num {
     base tcp-capability;
     description



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       "Identity for range-match TCP port number condition
        capability";
     reference
       "RFC 793: Transmission Control Protocol - Port Number";
   }

   identity exact-tcp-window-size {
     base tcp-capability;
     description
       "Identity for exact-match TCP window size condition capability";
     reference
       "RFC 793: Transmission Control Protocol - Window Size";
   }

   identity range-tcp-window-size {
     base tcp-capability;
     description
       "Identity for range-match TCP window size condition capability";
     reference
       "RFC 793: Transmission Control Protocol - Window Size";
   }

   identity tcp-flags {
     base tcp-capability;
     description
       "Identity for TCP flags condition capability";
     reference
       "RFC 793: Transmission Control Protocol - Flags";
   }

   identity udp-capability {
     base condition;
     description
       "Base identity for UDP condition capabilities";
     reference
       "RFC 768: User Datagram Protocol";
   }

   identity exact-udp-port-num {
     base udp-capability;
     description
       "Identity for exact-match UDP port number condition capability";
     reference
       "RFC 768: User Datagram Protocol - Port Number";
   }

   identity range-udp-port-num {
     base udp-capability;



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     description
       "Identity for range-match UDP port number condition capability";
     reference
       "RFC 768: User Datagram Protocol - Port Number";
   }

   identity exact-udp-total-length {
     base udp-capability;
     description
       "Identity for exact-match UDP total-length condition capability";
     reference
       "RFC 768: User Datagram Protocol - Total Length";
   }

   identity range-udp-total-length {
     base udp-capability;
     description
       "Identity for range-match UDP total-length condition capability";
     reference
       "RFC 768: User Datagram Protocol - Total Length";
   }

   identity sctp-capability {
    description
       "Identity for SCTP condition capabilities";
     reference
       "RFC 4960: Stream Control Transmission Protocol";
   }

   identity exact-sctp-port-num {
     base sctp-capability;
     description
       "Identity for exact-match SCTP port number condition
        capability";
     reference
       "RFC 4960: Stream Control Transmission Protocol - Port Number";
   }

   identity range-sctp-port-num {
     base sctp-capability;
     description
       "Identity for range-match SCTP port number condition
        capability";
     reference
       "RFC 4960: Stream Control Transmission Protocol - Port Number";
   }

   identity sctp-chunk-type {



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     base sctp-capability;
     description
       "Identity for SCTP chunk type condition capability";
     reference
       "RFC 4960: Stream Control Transmission Protocol - Chunk Type";
   }

   identity icmp-capability {
     base condition;
     description
       "Base identity for ICMP condition capability";
     reference
       "RFC 792: Internet Control Message Protocol";
   }

   identity icmp-type {
     base icmp-capability;
     description
       "Identity for ICMP type condition capability";
     reference
       "RFC 792: Internet Control Message Protocol";
   }

   identity icmp-code {
     base icmp-capability;
     description
       "Identity for ICMP code condition capability";
     reference
       "RFC 792: Internet Control Message Protocol";
   }

   identity icmpv6-capability {
     base condition;
     description
       "Base identity for ICMPv6 condition capability";
     reference
       "RFC 4443: Internet Control Message Protocol (ICMPv6)
        for the Internet Protocol Version 6 (IPv6) Specification
        - ICMPv6";
   }

   identity icmpv6-type {
     base icmpv6-capability;
     description
       "Identity for ICMPv6 type condition capability";
     reference
       "RFC 4443: Internet Control Message Protocol (ICMPv6)
        for the Internet Protocol Version 6 (IPv6) Specification



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        - ICMPv6";
   }

   identity icmpv6-code {
     base icmpv6-capability;
     description
       "Identity for ICMPv6 code condition capability";
     reference
       "RFC 4443: Internet Control Message Protocol (ICMPv6)
        for the Internet Protocol Version 6 (IPv6) Specification
        - ICMPv6";
   }

   identity url-capability {
     base condition;
     description
       "Base identity for URL condition capability";
   }

   identity pre-defined {
     base url-capability;
     description
       "Identity for pre-defined URL Database condition capability.
        The NSF capable of using a predefined public URL Database.";
   }

   identity user-defined {
     base url-capability;
     description
       "Identity for user-defined URL Database condition capability.
        The NSF capable of using a URL Database that can be added
        manually by a user.";
   }

   identity log-action-capability {
     description
       "Base identity for log-action capability";
   }

   identity rule-log {
     base log-action-capability;
     description
       "Identity for rule log log-action capability.
        Log the received packet based on the rule";
   }

   identity session-log {
     base log-action-capability;



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     description
       "Identity for session log log-action capability.
        Log the received packet based on the session.";
   }

   identity ingress-action-capability {
     description
       "Base identity for ingress-action capability";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Ingress action";
   }

   identity egress-action-capability {
     description
       "Base identity for egress-action capability";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Egress action";
   }

   identity default-action-capability {
     description
       "Base identity for default-action capability";
   }

   identity pass {
     base ingress-action-capability;
     base egress-action-capability;
     base default-action-capability;
     description
       "Identity for pass action capability";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Ingress, egress, and pass actions.";
   }

   identity drop {
     base ingress-action-capability;
     base egress-action-capability;
     base default-action-capability;
     description
       "Identity for drop action capability";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Ingress, egress, and drop actions.";
   }




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   identity alert {
     base ingress-action-capability;
     base egress-action-capability;
     base default-action-capability;
     description
       "Identity for alert action capability";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Ingress, egress, and alert actions.
        draft-ietf-i2nsf-nsf-monitoring-data-model-04: I2NSF
        NSF Monitoring YANG Data Model - Alarm (i.e., alert).";
   }

   identity mirror {
     base ingress-action-capability;
     base egress-action-capability;
     base default-action-capability;
     description
       "Identity for mirror action capability";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Ingress, egress, and mirror actions.";
   }

   identity invoke-signaling {
     base egress-action-capability;
     description
       "Identity for invoke signaling action capability";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Invoke-signaling action";
   }

   identity forwarding {
     base egress-action-capability;
     description
       "Identity for forwarding action capability";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Forwarding action";
   }

   identity redirection {
     base egress-action-capability;
     description
       "Identity for redirection action capability";
     reference
       "RFC 8329: Framework for Interface to Network Security



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        Functions - Redirection action";
   }

   identity resolution-strategy-capability {
     description
       "Base identity for resolution strategy capability";
   }

   identity fmr {
     base resolution-strategy-capability;
     description
       "Identity for First Matching Rule (FMR) resolution
        strategy capability";
   }

   identity lmr {
     base resolution-strategy-capability;
     description
       "Identity for Last Matching Rule (LMR) resolution
        strategy capability";
   }

   identity pmr {
     base resolution-strategy-capability;
     description
       "Identity for Prioritized Matching Rule (PMR) resolution
        strategy capability";
   }

   identity pmre {
     base resolution-strategy-capability;
     description
       "Identity for Prioritized Matching Rule with Errors (PMRE)
        resolution strategy capability";
   }

   identity pmrn {
     base resolution-strategy-capability;
     description
       "Identity for Prioritized Matching Rule with No Errors (PMRN)
        resolution strategy capability";
   }

   identity advanced-nsf-capability {
     description
       "Base identity for advanced Network Security Function (NSF)
        capability.  This can be used for advanced NSFs such as
        Anti-Virus, Anti-DDoS Attack, IPS, and VoIP/VoLTE Security



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        Service.";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Advanced NSF capability";
   }

   identity anti-virus-capability {
     base advanced-nsf-capability;
     description
       "Identity for advanced NSF Anti-Virus capability.
        This can be used for an extension point for Anti-Virus
        as an advanced NSF.";
        reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Advanced NSF Anti-Virus capability";
   }

   identity anti-ddos-capability {
     base advanced-nsf-capability;
     description
       "Identity for advanced NSF Anti-DDoS Attack capability.
        This can be used for an extension point for Anti-DDoS
        Attack as an advanced NSF.";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Advanced NSF Anti-DDoS Attack capability";
   }

   identity ips-capability {
     base advanced-nsf-capability;
     description
       "Identity for advanced NSF IPS capabilities.  This can be
        used for an extension point for IPS as an advanced NSF.";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Advanced NSF IPS capability";
   }

   identity voip-volte-capability {
     base advanced-nsf-capability;
     description
       "Identity for advanced NSF VoIP/VoLTE Security Service
        capability.  This can be used for an extension point
        for VoIP/VoLTE Security Service as an advanced NSF.";
     reference
       "RFC 3261: SIP: Session Initiation Protocol";
   }




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   identity detect {
     base anti-virus-capability;
     description
       "Identity for advanced NSF Anti-Virus Detection capability.
        This can be used for an extension point for Anti-Virus
        Detection as an advanced NSF.";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Advanced NSF Anti-Virus Detection capability";
   }

   identity allow-list {
     base anti-virus-capability;
     description
       "Identity for advanced NSF Anti-Virus Allow List capability.
        This can be used for an extension point for Anti-Virus
        Allow List as an advanced NSF.";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Advanced NSF Anti-Virus Allow List capability";
   }

   identity syn-flood-action {
     base anti-ddos-capability;
     description
       "Identity for advanced NSF Anti-DDoS SYN Flood Action
        capability.  This can be used for an extension point for
        Anti-DDoS SYN Flood Action as an advanced NSF.";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Advanced NSF Anti-DDoS SYN Flood Action
        capability";
   }

   identity udp-flood-action {
     base anti-ddos-capability;
     description
       "Identity for advanced NSF Anti-DDoS UDP Flood Action
        capability.  This can be used for an extension point for
        Anti-DDoS UDP Flood Action as an advanced NSF.";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Advanced NSF Anti-DDoS UDP Flood Action
        capability";
   }

   identity http-flood-action {
     base anti-ddos-capability;



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     description
       "Identity for advanced NSF Anti-DDoS HTTP Flood Action
        capability.  This can be used for an extension point for
        Anti-DDoS HTTP Flood Action as an advanced NSF.";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Advanced NSF Anti-DDoS HTTP Flood Action
        capability";
   }

   identity https-flood-action {
     base anti-ddos-capability;
     description
       "Identity for advanced NSF Anti-DDoS HTTPS Flood Action
        capability.  This can be used for an extension point for
        Anti-DDoS HTTPS Flood Action as an advanced NSF.";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Advanced NSF Anti-DDoS HTTPS Flood Action
        capability";
   }

   identity dns-request-flood-action {
     base anti-ddos-capability;
     description
       "Identity for advanced NSF Anti-DDoS DNS Request Flood
        Action capability.  This can be used for an extension
        point for Anti-DDoS DNS Request Flood Action as an
        advanced NSF.";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Advanced NSF Anti-DDoS DNS Request Flood
        Action capability";
   }

   identity dns-reply-flood-action {
     base anti-ddos-capability;
     description
       "Identity for advanced NSF Anti-DDoS DNS Reply Flood
        Action capability.  This can be used for an extension
        point for Anti-DDoS DNS Reply Flood Action as an
        advanced NSF.";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Advanced NSF Anti-DDoS DNS Reply Flood
        Action capability";
   }




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   identity icmp-flood-action {
     base anti-ddos-capability;
     description
       "Identity for advanced NSF Anti-DDoS ICMP Flood Action
        capability.  This can be used for an extension point
        for Anti-DDoS ICMP Flood Action as an advanced NSF.";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Advanced NSF Anti-DDoS ICMP Flood Action
        capability";
   }

   identity icmpv6-flood-action {
     base anti-ddos-capability;
     description
       "Identity for advanced NSF Anti-DDoS ICMPv6 Flood Action
        capability.  This can be used for an extension point
        for Anti-DDoS ICMPv6 Flood Action as an advanced NSF.";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Advanced NSF Anti-DDoS ICMPv6 Flood Action
        capability";
   }

   identity sip-flood-action {
     base anti-ddos-capability;
     description
       "Identity for advanced NSF Anti-DDoS SIP Flood Action
        capability.  This can be used for an extension point
        for Anti-DDoS SIP Flood Action as an advanced NSF.";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Advanced NSF Anti-DDoS SIP Flood Action
        capability";
   }

   identity detect-mode {
     base anti-ddos-capability;
     description
       "Identity for advanced NSF Anti-DDoS Detection Mode
        capability.  This can be used for an extension point
        for Anti-DDoS Detection Mode as an advanced NSF.";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Advanced NSF Anti-DDoS Detection Mode
        capability";
   }




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   identity baseline-learning {
     base anti-ddos-capability;
     description
       "Identity for advanced NSF Anti-DDoS Baseline Learning
        capability.  This can be used for an extension point
        for Anti-DDoS Baseline Learning as an advanced NSF.";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Advanced NSF Anti-DDoS Baseline Learning
        capability";
   }

   identity signature-set {
     base ips-capability;
     description
       "Identity for advanced NSF IPS Signature Set capability.
        This can be used for an extension point for IPS Signature
        Set as an advanced NSF.";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Advanced NSF IPS Signature Set capability";
   }

   identity ips-exception-signature {
     base ips-capability;
     description
       "Identity for advanced NSF IPS Exception Signature
        capability.  This can be used for an extension point for
        IPS Exception Signature as an advanced NSF.";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - Advanced NSF IPS Exception Signature Set
        capability";
   }

   identity voip-volte-call-id {
     base voip-volte-capability;
     description
       "Identity for advanced NSF VoIP/VoLTE Call-ID capability.
        This can be used for an extension point for VoIP/VoLTE
        Voice-ID as an advanced NSF.";
     reference
       "RFC 3261: SIP: Session Initiation Protocol";

   }

   identity user-agent {
     base voip-volte-capability;



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     description
       "Identity for advanced NSF VoIP/VoLTE User Agent capability.
        This can be used for an extension point for VoIP/VoLTE
        User Agent as an advanced NSF.";
     reference
       "RFC 3261: SIP: Session Initiation Protocol";
   }

   identity ipsec-capability {
     description
       "Base identity for an IPsec capability";
     reference
       "draft-ietf-i2nsf-sdn-ipsec-flow-protection-08:
        Software-Defined Networking (SDN)-based IPsec Flow
        Protection - IPsec methods such as IKE and IKE-less";
   }

   identity ike {
     base ipsec-capability;
     description
       "Identity for an IPsec Internet Key Exchange (IKE)
       capability";
     reference
       "draft-ietf-i2nsf-sdn-ipsec-flow-protection-08:
        Software-Defined Networking (SDN)-based IPsec Flow
        Protection - IPsec method with IKE.
        RFC 7296: Internet Key Exchange Protocol Version 2
        (IKEv2) - IKE as a component of IPsec used for
        performing mutual authentication and establishing and
        maintaining Security Associations (SAs).";
   }

   identity ikeless {
     base ipsec-capability;
     description
       "Identity for an IPsec without Internet Key Exchange (IKE)
       capability";
     reference
       "draft-ietf-i2nsf-sdn-ipsec-flow-protection-08:
        Software-Defined Networking (SDN)-based IPsec Flow
        Protection - IPsec method without IKE";
   }

   /*
    *  Grouping
    */

   grouping nsf-capabilities {



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     description
       "Network Security Function (NSF) Capabilities";
     reference
       "RFC 8329: Framework for Interface to Network Security
        Functions - I2NSF Flow Security Policy Structure.";

     leaf-list time-capabilities {
       type enumeration {
         enum absolute-time {
           description
             "absolute time capabilities.
              If a network security function has the absolute time
              capability, the network security function supports
              rule execution according to absolute time.";
         }
         enum periodic-time {
           description
             "periodic time capabilities.
              If a network security function has the periodic time
              capability, the network security function supports
              rule execution according to periodic time.";
         }
       }
       description
         "Time capabilities";
     }

     container event-capabilities {
       description
         "Capabilities of events.
          If a network security function has the event capabilities,
          the network security function supports rule execution
          according to system event and system alarm.";

       reference
         "RFC 8329: Framework for Interface to Network Security
          Functions - I2NSF Flow Security Policy Structure.
          draft-ietf-i2nsf-nsf-monitoring-data-model-04: I2NSF
          NSF Monitoring YANG Data Model - System Alarm and
          System Events.";

       leaf-list system-event-capability {
         type identityref {
           base system-event-capability;
         }
         description
           "System event capabilities";
       }



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       leaf-list system-alarm-capability {
         type identityref {
           base system-alarm-capability;
         }
         description
           "System alarm capabilities";
       }
     }

     container condition-capabilities {
       description
         "Conditions capabilities.";

       container generic-nsf-capabilities {
         description
           "Conditions capabilities.
            If a network security function has the condition
            capabilities, the network security function
            supports rule execution according to conditions of
            IPv4, IPv6, TCP, UDP, SCTP, ICMP, ICMPv6, or payload.";
         reference
           "RFC 791: Internet Protocol - IPv4.
            RFC 792: Internet Control Message Protocol - ICMP.
            RFC 793: Transmission Control Protocol - TCP.
            RFC 768: User Datagram Protocol - UDP.
            RFC 4960: Stream Control Transmission Protocol - SCTP.
            RFC 8200: Internet Protocol, Version 6 (IPv6)
            Specification - IPv6.
            RFC 4443: Internet Control Message Protocol (ICMPv6)
            for the Internet Protocol Version 6 (IPv6) Specification
            - ICMPv6.
            RFC 8329: Framework for Interface to Network Security
            Functions - I2NSF Flow Security Policy Structure.";

         leaf-list ipv4-capability {
           type identityref {
             base ipv4-capability;
           }
           description
             "IPv4 packet capabilities";
           reference
             "RFC 791: Internet Protocol";
         }

         leaf-list icmp-capability {
           type identityref {
             base icmp-capability;
           }



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           description
             "ICMP packet capabilities";
           reference
             "RFC 792: Internet Control Message Protocol - ICMP";
         }

         leaf-list ipv6-capability {
           type identityref {
             base ipv6-capability;
           }
           description
             "IPv6 packet capabilities";
           reference
             "RFC 8200: Internet Protocol, Version 6 (IPv6)
              Specification - IPv6";
         }

         leaf-list icmpv6-capability {
           type identityref {
             base icmpv6-capability;
           }
           description
             "ICMPv6 packet capabilities";
           reference
             "RFC 4443: Internet Control Message Protocol (ICMPv6)
              for the Internet Protocol Version 6 (IPv6) Specification
              - ICMPv6";
         }

         leaf-list tcp-capability {
           type identityref {
             base tcp-capability;
           }
           description
             "TCP packet capabilities";
           reference
             "RFC 793: Transmission Control Protocol - TCP";
         }

         leaf-list udp-capability {
           type identityref {
             base udp-capability;
           }
           description
             "UDP packet capabilities";
           reference
             "RFC 768: User Datagram Protocol - UDP";
         }



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         leaf-list sctp-capability {
           type identityref {
             base sctp-capability;
           }
           description
             "SCTP packet capabilities";
           reference
             "RFC 4960: Stream Control Transmission Protocol - SCTP";
         }
       }

       container advanced-nsf-capabilities {
         description
           "Advanced Network Security Function (NSF) capabilities,
            such as Anti-Virus, Anti-DDoS, IPS, and VoIP/VoLTE.
            This container contains the leaf-lists of advanced
            NSF capabilities";
         reference
           "RFC 8329: Framework for Interface to Network Security
            Functions - Advanced NSF capabilities";

         leaf-list anti-virus-capability {
           type identityref {
             base anti-virus-capability;
           }
           description
             "Anti-Virus capabilities";
           reference
             "RFC 8329: Framework for Interface to Network Security
              Functions - Advanced NSF Anti-Virus capabilities";
           }

         leaf-list anti-ddos-capability {
           type identityref {
             base anti-ddos-capability;
           }
           description
             "Anti-DDoS Attack capabilities";
           reference
             "RFC 8329: Framework for Interface to Network Security
              Functions - Advanced NSF Anti-DDoS Attack capabilities";
         }

         leaf-list ips-capability {
           type identityref {
             base ips-capability;
           }
           description



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             "IPS capabilities";
           reference
             "RFC 8329: Framework for Interface to Network Security
              Functions - Advanced NSF IPS capabilities";
         }

         leaf-list url-capability {
           type identityref {
             base url-capability;
           }
           description
             "URL capabilities";
           reference
             "RFC 8329: Framework for Interface to Network Security
              Functions - Advanced NSF URL capabilities";
         }

         leaf-list voip-volte-capability {
           type identityref {
             base voip-volte-capability;
          }
           description
             "VoIP/VoLTE capabilities";
           reference
             "RFC 8329: Framework for Interface to Network Security
              Functions - Advanced NSF VoIP/VoLTE capabilities";
         }
       }

       leaf-list context-capabilities {
         type identityref {
           base context-capability;
         }
         description
           "Security context capabilities";
       }
     }

     container action-capabilities {
       description
         "Action capabilities.
          If a network security function has the action capabilities,
          the network security function supports the attendant
          actions for policy rules.";

       leaf-list ingress-action-capability {
         type identityref {
           base ingress-action-capability;



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         }
         description
           "Ingress-action capabilities";
       }

       leaf-list egress-action-capability {
         type identityref {
           base egress-action-capability;
         }
         description
           "Egress-action capabilities";
       }

       leaf-list log-action-capability {
         type identityref {
           base log-action-capability;
         }
         description
           "Log-action capabilities";
       }
     }

     leaf-list resolution-strategy-capabilities {
       type identityref {
         base resolution-strategy-capability;
       }
       description
         "Resolution strategy capabilities.
          The resolution strategies can be used to specify how
          to resolve conflicts that occur between the actions
          of the same or different policy rules that are matched
          for the same packet and by particular NSF";
     }

     leaf-list default-action-capabilities {
       type identityref {
         base default-action-capability;
       }
       description
         "Default action capabilities.
          A default action is used to execute I2NSF policy rules
          when no rule matches a packet. The default action is
          defined as pass, drop, alert, or mirror.";
       reference
         "RFC 8329: Framework for Interface to Network Security
          Functions - Ingress and egress actions.";
     }




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     leaf-list ipsec-method {
       type identityref {
         base ipsec-capability;
       }
       description
         "IPsec method capabilities";
       reference
         "draft-ietf-i2nsf-sdn-ipsec-flow-protection-08:
          Software-Defined Networking (SDN)-based IPsec Flow
          Protection - IPsec methods such as IKE and IKE-less";
     }
   }

   /*
    * Data nodes
    */

   list nsf {
     key "nsf-name";
     description
       "The list of Network Security Functions (NSFs)";
     leaf nsf-name {
       type string;
       mandatory true;
       description
         "The name of Network Security Function (NSF)";
     }
     uses nsf-capabilities;
   }
 }


 <CODE ENDS>

              Figure 3: YANG Data Module of I2NSF Capability

7.  IANA Considerations

   This document requests IANA to register the following URI in the
   "IETF XML Registry" [RFC3688]:

   ID: yang:ietf-i2nsf-capability
   URI: urn:ietf:params:xml:ns:yang:ietf-i2nsf-capability
   Registrant Contact: The IESG.
   XML: N/A; the requested URI is an XML namespace.
   Filename: [ TBD-at-Registration ]
   Reference: [ RFC-to-be ]




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   This document requests IANA to register the following YANG module in
   the "YANG Module Names" registry [RFC7950][RFC8525]:

   Name: ietf-i2nsf-capability
   Maintained by IANA? N
   Namespace: urn:ietf:params:xml:ns:yang:ietf-i2nsf-capability
   Prefix: nsfcap
   Module:
   Reference: [ RFC-to-be ]


8.  Security Considerations

   The YANG module specified in this document defines a data schema
   designed to be accessed through network management protocols such as
   NETCONF [RFC6241] or RESTCONF [RFC8040].  The lowest NETCONF layer is
   the secure transport layer, and the required transport secure
   transport is Secure Shell (SSH) [RFC6242].  The lowest RESTCONF layer
   is HTTPS, and the required transport secure transport is TLS
   [RFC8446].

   The NETCONF access control model [RFC8341] provides a means of
   restricting access to specific NETCONF or RESTCONF users to a
   preconfigured subset of all available NETCONF or RESTCONF protocol
   operations and content.

   There are a number of data nodes defined in this YANG module that are
   writable, creatable, and deletable (i.e., config true, which is the
   default).  These data nodes may be considered sensitive or vulnerable
   in some network environments.  Write operations to these data nodes
   could have a negative effect on network and security operations.

   o  list nsf: An attacker could alter the security capabilities
      associated with an NSF whereby disabling or enabling the evasion
      of security mitigations.

9.  References

9.1.  Normative References

   [I-D.google-self-published-geofeeds]
              Kline, E., Duleba, K., Szamonek, Z., Moser, S., and W.
              Kumari, "A Format for Self-published IP Geolocation
              Feeds", draft-google-self-published-geofeeds-09 (work in
              progress), February 2020.






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   [I-D.ietf-i2nsf-nsf-monitoring-data-model]
              Jeong, J., Lingga, P., Hares, S., Xia, L., and H.
              Birkholz, "I2NSF NSF Monitoring YANG Data Model", draft-
              ietf-i2nsf-nsf-monitoring-data-model-04 (work in
              progress), September 2020.

   [I-D.ietf-i2nsf-sdn-ipsec-flow-protection]
              Lopez, R., Lopez-Millan, G., and F. Pereniguez-Garcia,
              "Software-Defined Networking (SDN)-based IPsec Flow
              Protection", draft-ietf-i2nsf-sdn-ipsec-flow-protection-12
              (work in progress), October 2020.

   [RFC0768]  Postel, J., "User Datagram Protocol", STD 6, RFC 768,
              DOI 10.17487/RFC0768, August 1980,
              <https://www.rfc-editor.org/info/rfc768>.

   [RFC0791]  Postel, J., "Internet Protocol", STD 5, RFC 791,
              DOI 10.17487/RFC0791, September 1981,
              <https://www.rfc-editor.org/info/rfc791>.

   [RFC0792]  Postel, J., "Internet Control Message Protocol", STD 5,
              RFC 792, DOI 10.17487/RFC0792, September 1981,
              <https://www.rfc-editor.org/info/rfc792>.

   [RFC0793]  Postel, J., "Transmission Control Protocol", STD 7,
              RFC 793, DOI 10.17487/RFC0793, September 1981,
              <https://www.rfc-editor.org/info/rfc793>.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC3261]  Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston,
              A., Peterson, J., Sparks, R., Handley, M., and E.
              Schooler, "SIP: Session Initiation Protocol", RFC 3261,
              DOI 10.17487/RFC3261, June 2002,
              <https://www.rfc-editor.org/info/rfc3261>.

   [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
              DOI 10.17487/RFC3688, January 2004,
              <https://www.rfc-editor.org/info/rfc3688>.

   [RFC4443]  Conta, A., Deering, S., and M. Gupta, Ed., "Internet
              Control Message Protocol (ICMPv6) for the Internet
              Protocol Version 6 (IPv6) Specification", STD 89,
              RFC 4443, DOI 10.17487/RFC4443, March 2006,
              <https://www.rfc-editor.org/info/rfc4443>.



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   [RFC4960]  Stewart, R., Ed., "Stream Control Transmission Protocol",
              RFC 4960, DOI 10.17487/RFC4960, September 2007,
              <https://www.rfc-editor.org/info/rfc4960>.

   [RFC6020]  Bjorklund, M., Ed., "YANG - A Data Modeling Language for
              the Network Configuration Protocol (NETCONF)", RFC 6020,
              DOI 10.17487/RFC6020, October 2010,
              <https://www.rfc-editor.org/info/rfc6020>.

   [RFC6241]  Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
              and A. Bierman, Ed., "Network Configuration Protocol
              (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011,
              <https://www.rfc-editor.org/info/rfc6241>.

   [RFC6242]  Wasserman, M., "Using the NETCONF Protocol over Secure
              Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011,
              <https://www.rfc-editor.org/info/rfc6242>.

   [RFC6991]  Schoenwaelder, J., Ed., "Common YANG Data Types",
              RFC 6991, DOI 10.17487/RFC6991, July 2013,
              <https://www.rfc-editor.org/info/rfc6991>.

   [RFC7296]  Kaufman, C., Hoffman, P., Nir, Y., Eronen, P., and T.
              Kivinen, "Internet Key Exchange Protocol Version 2
              (IKEv2)", STD 79, RFC 7296, DOI 10.17487/RFC7296, October
              2014, <https://www.rfc-editor.org/info/rfc7296>.

   [RFC7950]  Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
              RFC 7950, DOI 10.17487/RFC7950, August 2016,
              <https://www.rfc-editor.org/info/rfc7950>.

   [RFC8040]  Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
              Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017,
              <https://www.rfc-editor.org/info/rfc8040>.

   [RFC8192]  Hares, S., Lopez, D., Zarny, M., Jacquenet, C., Kumar, R.,
              and J. Jeong, "Interface to Network Security Functions
              (I2NSF): Problem Statement and Use Cases", RFC 8192,
              DOI 10.17487/RFC8192, July 2017,
              <https://www.rfc-editor.org/info/rfc8192>.

   [RFC8200]  Deering, S. and R. Hinden, "Internet Protocol, Version 6
              (IPv6) Specification", STD 86, RFC 8200,
              DOI 10.17487/RFC8200, July 2017,
              <https://www.rfc-editor.org/info/rfc8200>.






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   [RFC8329]  Lopez, D., Lopez, E., Dunbar, L., Strassner, J., and R.
              Kumar, "Framework for Interface to Network Security
              Functions", RFC 8329, DOI 10.17487/RFC8329, February 2018,
              <https://www.rfc-editor.org/info/rfc8329>.

   [RFC8340]  Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams",
              BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018,
              <https://www.rfc-editor.org/info/rfc8340>.

   [RFC8341]  Bierman, A. and M. Bjorklund, "Network Configuration
              Access Control Model", STD 91, RFC 8341,
              DOI 10.17487/RFC8341, March 2018,
              <https://www.rfc-editor.org/info/rfc8341>.

   [RFC8407]  Bierman, A., "Guidelines for Authors and Reviewers of
              Documents Containing YANG Data Models", BCP 216, RFC 8407,
              DOI 10.17487/RFC8407, October 2018,
              <https://www.rfc-editor.org/info/rfc8407>.

   [RFC8446]  Rescorla, E., "The Transport Layer Security (TLS) Protocol
              Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018,
              <https://www.rfc-editor.org/info/rfc8446>.

   [RFC8519]  Jethanandani, M., Agarwal, S., Huang, L., and D. Blair,
              "YANG Data Model for Network Access Control Lists (ACLs)",
              RFC 8519, DOI 10.17487/RFC8519, March 2019,
              <https://www.rfc-editor.org/info/rfc8519>.

   [RFC8525]  Bierman, A., Bjorklund, M., Schoenwaelder, J., Watsen, K.,
              and R. Wilton, "YANG Library", RFC 8525,
              DOI 10.17487/RFC8525, March 2019,
              <https://www.rfc-editor.org/info/rfc8525>.

   [RFC8805]  Kline, E., Duleba, K., Szamonek, Z., Moser, S., and W.
              Kumari, "A Format for Self-Published IP Geolocation
              Feeds", RFC 8805, DOI 10.17487/RFC8805, August 2020,
              <https://www.rfc-editor.org/info/rfc8805>.

9.2.  Informative References

   [Alshaer]  Shaer, Al., Hamed, E., and H. Hamed, "Modeling and
              management of firewall policies", 2004.

   [Galitsky]
              Galitsky, B. and R. Pampapathi, "Can many agents answer
              questions better than one", First
              Monday http://dx.doi.org/10.5210/fm.v10i1.1204, 2005.




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   [Hirschman]
              Hirschman, L. and R. Gaizauskas, "Natural Language
              Question Answering: The View from Here", Natural Language
              Engineering 7:4, pgs 275-300, Cambridge University Press ,
              Nov 2001.

   [Hohpe]    Hohpe, G. and B. Woolf, "Enterprise Integration Patterns",
              ISBN 0-32-120068-3 , 2003.

   [I-D.ietf-i2nsf-terminology]
              Hares, S., Strassner, J., Lopez, D., Xia, L., and H.
              Birkholz, "Interface to Network Security Functions (I2NSF)
              Terminology", draft-ietf-i2nsf-terminology-08 (work in
              progress), July 2019.

   [I-D.ietf-supa-generic-policy-info-model]
              Strassner, J., Halpern, J., and S. Meer, "Generic Policy
              Information Model for Simplified Use of Policy
              Abstractions (SUPA)", draft-ietf-supa-generic-policy-info-
              model-03 (work in progress), May 2017.

   [IANA-Protocol-Numbers]
              "Assigned Internet Protocol Numbers", Available:
              https://www.iana.org/assignments/protocol-
              numbers/protocol-numbers.xhtml, September 2020.

   [Martin]   Martin, R., "Agile Software Development, Principles,
              Patterns, and Practices", Prentice-Hall , ISBN:
              0-13-597444-5 , 2002.

   [OODMP]    "http://www.oodesign.com/mediator-pattern.html".

   [OODOP]    "http://www.oodesign.com/mediator-pattern.html".

   [OODSRP]   "http://www.oodesign.com/mediator-pattern.html".
















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Appendix A.  Configuration Examples

   This section shows configuration examples of "ietf-i2nsf-capability"
   module for capabilities registration of general firewall.

A.1.  Example 1: Registration for the Capabilities of a General Firewall

   This section shows a configuration example for the capabilities
   registration of a general firewall in either an IPv4 network or an
   IPv6 network.


   <nsf xmlns="urn:ietf:params:xml:ns:yang:ietf-i2nsf-capability">
    <nsf-name>general_firewall</nsf-name>
    <condition-capabilities>
     <generic-nsf-capabilities>
      <ipv4-capability>ipv4-protocol</ipv4-capability>
      <ipv4-capability>exact-ipv4-address</ipv4-capability>
      <ipv4-capability>range-ipv4-address</ipv4-capability>
      <tcp-capability>exact-fourth-layer-port-num</tcp-capability>
      <tcp-capability>range-fourth-layer-port-num</tcp-capability>
     </generic-nsf-capabilities>
    </condition-capabilities>
    <action-capabilities>
     <ingress-action-capability>pass</ingress-action-capability>
     <ingress-action-capability>drop</ingress-action-capability>
     <ingress-action-capability>alert</ingress-action-capability>
     <egress-action-capability>pass</egress-action-capability>
     <egress-action-capability>drop</egress-action-capability>
     <egress-action-capability>alert</egress-action-capability>
    </action-capabilities>
   </nsf>


    Figure 4: Configuration XML for the Capabilities Registration of a
                    General Firewall in an IPv4 Network

   Figure 4 shows the configuration XML for the capabilities
   registration of a general firewall as an NSF in an IPv4 network.  Its
   capabilities are as follows.

   1.  The name of the NSF is general_firewall.

   2.  The NSF can inspect a protocol, an exact IPv4 address, and a
       range of IPv4 addresses for IPv4 packets.

   3.  The NSF can inspect an exact port number and a range of port
       numbers for the fourth layer packets.



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   4.  The NSF can control whether the packets are allowed to pass,
       drop, or alert.


   <nsf xmlns="urn:ietf:params:xml:ns:yang:ietf-i2nsf-capability">
    <nsf-name>general_firewall</nsf-name>
    <condition-capabilities>
     <generic-nsf-capabilities>
      <ipv6-capability>ipv6-next-header</ipv6-capability>
      <ipv6-capability>exact-ipv6-address</ipv6-capability>
      <ipv6-capability>range-ipv6-address</ipv6-capability>
      <tcp-capability>exact-fourth-layer-port-num</tcp-capability>
      <tcp-capability>range-fourth-layer-port-num</tcp-capability>
     </generic-nsf-capabilities>
    </condition-capabilities>
    <action-capabilities>
     <ingress-action-capability>pass</ingress-action-capability>
     <ingress-action-capability>drop</ingress-action-capability>
     <ingress-action-capability>alert</ingress-action-capability>
     <egress-action-capability>pass</egress-action-capability>
     <egress-action-capability>drop</egress-action-capability>
     <egress-action-capability>alert</egress-action-capability>
    </action-capabilities>
   </nsf>


    Figure 5: Configuration XML for the Capabilities Registration of a
                    General Firewall in an IPv6 Network

   In addition, Figure 5 shows the configuration XML for the
   capabilities registration of a general firewall as an NSF in an IPv6
   network.  Its capabilities are as follows.

   1.  The name of the NSF is general_firewall.

   2.  The NSF can inspect a protocol (Next-Header), an exact IPv6
       address, and a range of IPv6 addresses for IPv6 packets.

   3.  The NSF can inspect an exact port number and a range of port
       numbers for the fourth layer packets.

   4.  The NSF can control whether the packets are allowed to pass,
       drop, or alert.








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A.2.  Example 2: Registration for the Capabilities of a Time-based
      Firewall

   This section shows a configuration example for the capabilities
   registration of a time-based firewall in either an IPv4 network or an
   IPv6 network.


   <nsf xmlns="urn:ietf:params:xml:ns:yang:ietf-i2nsf-capability">
    <nsf-name>time_based_firewall</nsf-name>
    <time-capabilities>absolute-time</time-capabilities>
    <time-capabilities>periodic-time</time-capabilities>
    <condition-capabilities>
     <generic-nsf-capabilities>
      <ipv4-capability>ipv4-next-header</ipv4-capability>
      <ipv4-capability>exact-ipv4-address</ipv4-capability>
      <ipv4-capability>range-ipv4-address</ipv4-capability>
     </generic-nsf-capabilities>
    </condition-capabilities>
    <action-capabilities>
     <ingress-action-capability>pass</ingress-action-capability>
     <ingress-action-capability>drop</ingress-action-capability>
     <ingress-action-capability>alert</ingress-action-capability>
     <egress-action-capability>pass</egress-action-capability>
     <egress-action-capability>drop</egress-action-capability>
     <egress-action-capability>alert</egress-action-capability>
    </action-capabilities>
   </nsf>


    Figure 6: Configuration XML for the Capabilities Registration of a
                  Time-based Firewall in an IPv4 Network

   Figure 6 shows the configuration XML for the capabilities
   registration of a time-based firewall as an NSF in an IPv4 network.
   Its capabilities are as follows.

   1.  The name of the NSF is time_based_firewall.

   2.  The NSF can execute the security policy rule according to
       absolute time and periodic time.

   3.  The NSF can inspect a protocol (Next-Header), an exact IPv4
       address, and a range of IPv4 addresses for IPv4 packets.

   4.  The NSF can control whether the packets are allowed to pass,
       drop, or alert.




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   <nsf xmlns="urn:ietf:params:xml:ns:yang:ietf-i2nsf-capability">
    <nsf-name>time_based_firewall</nsf-name>
    <time-capabilities>absolute-time</time-capabilities>
    <time-capabilities>periodic-time</time-capabilities>
    <condition-capabilities>
     <generic-nsf-capabilities>
      <ipv6-capability>ipv6-next-header</ipv6-capability>
      <ipv6-capability>exact-ipv6-address</ipv6-capability>
      <ipv6-capability>range-ipv6-address</ipv6-capability>
     </generic-nsf-capabilities>
    </condition-capabilities>
    <action-capabilities>
     <ingress-action-capability>pass</ingress-action-capability>
     <ingress-action-capability>drop</ingress-action-capability>
     <ingress-action-capability>alert</ingress-action-capability>
     <egress-action-capability>pass</egress-action-capability>
     <egress-action-capability>drop</egress-action-capability>
     <egress-action-capability>alert</egress-action-capability>
    </action-capabilities>
   </nsf>


    Figure 7: Configuration XML for the Capabilities Registration of a
                  Time-based Firewall in an IPv6 Network

   In addition, Figure 7 shows the configuration XML for the
   capabilities registration of a time-based firewall as an NSF in an
   IPv6 network.  Its capabilities are as follows.

   1.  The name of the NSF is time_based_firewall.

   2.  The NSF can execute the security policy rule according to
       absolute time and periodic time.

   3.  The NSF can inspect a protocol (Next-Header), an exact IPv6
       address, and a range of IPv6 addresses for IPv6 packets.

   4.  The NSF can control whether the packets are allowed to pass,
       drop, or alert.

A.3.  Example 3: Registration for the Capabilities of a Web Filter

   This section shows a configuration example for the capabilities
   registration of a web filter.







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   <nsf xmlns="urn:ietf:params:xml:ns:yang:ietf-i2nsf-capability">
    <nsf-name>web_filter</nsf-name>
    <condition-capabilities>
     <advanced-nsf-capabilities>
      <url-capability>user-defined</url-capability>
     </advanced-nsf-capabilities>
    </condition-capabilities>
    <action-capabilities>
     <ingress-action-capability>pass</ingress-action-capability>
     <ingress-action-capability>drop</ingress-action-capability>
     <ingress-action-capability>alert</ingress-action-capability>
     <egress-action-capability>pass</egress-action-capability>
     <egress-action-capability>drop</egress-action-capability>
     <egress-action-capability>alert</egress-action-capability>
    </action-capabilities>
   </nsf>


    Figure 8: Configuration XML for the Capabilities Registration of a
                                Web Filter

   Figure 8 shows the configuration XML for the capabilities
   registration of a web filter as an NSF.  Its capabilities are as
   follows.

   1.  The name of the NSF is web_filter.

   2.  The NSF can inspect URL matched from a user-defined URL Database.
       User can add a new URL into the database.

   3.  The NSF can control whether the packets are allowed to pass,
       drop, or alert.

A.4.  Example 4: Registration for the Capabilities of a VoIP/VoLTE
      Filter

   This section shows a configuration example for the capabilities
   registration of a VoIP/VoLTE filter.













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   <nsf xmlns="urn:ietf:params:xml:ns:yang:ietf-i2nsf-capability">
    <nsf-name>voip_volte_filter</nsf-name>
    <condition-capabilities>
     <advanced-nsf-capabilities>
      <voip-volte-capability>voice-id</voip-volte-capability>
     </advanced-nsf-capabilities>
    </condition-capabilities>
    <action-capabilities>
     <ingress-action-capability>pass</ingress-action-capability>
     <ingress-action-capability>drop</ingress-action-capability>
     <ingress-action-capability>alert</ingress-action-capability>
     <egress-action-capability>pass</egress-action-capability>
     <egress-action-capability>drop</egress-action-capability>
     <egress-action-capability>alert</egress-action-capability>
    </action-capabilities>
   </nsf>


    Figure 9: Configuration XML for the Capabilities Registration of a
                             VoIP/VoLTE Filter

   Figure 9 shows the configuration XML for the capabilities
   registration of a VoIP/VoLTE filter as an NSF.  Its capabilities are
   as follows.

   1.  The name of the NSF is voip_volte_filter.

   2.  The NSF can inspect a voice id for VoIP/VoLTE packets.

   3.  The NSF can control whether the packets are allowed to pass,
       drop, or alert.

A.5.  Example 5: Registration for the Capabilities of a HTTP and HTTPS
      Flood Mitigator

   This section shows a configuration example for the capabilities
   registration of a HTTP and HTTPS flood mitigator.














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   <nsf xmlns="urn:ietf:params:xml:ns:yang:ietf-i2nsf-capability">
    <nsf-name>http_and_https_flood_mitigation</nsf-name>
    <condition-capabilities>
     <advanced-nsf-capabilities>
      <anti-ddos-capability>http-flood-action</anti-ddos-capability>
      <anti-ddos-capability>https-flood-action</anti-ddos-capability>
     </advanced-nsf-capabilities>
    </condition-capabilities>
    <action-capabilities>
     <ingress-action-capability>pass</ingress-action-capability>
     <ingress-action-capability>drop</ingress-action-capability>
     <ingress-action-capability>alert</ingress-action-capability>
     <egress-action-capability>pass</egress-action-capability>
     <egress-action-capability>drop</egress-action-capability>
     <egress-action-capability>alert</egress-action-capability>
    </action-capabilities>
   </nsf>


    Figure 10: Configuration XML for the Capabilities Registration of a
                      HTTP and HTTPS Flood Mitigator

   Figure 10 shows the configuration XML for the capabilities
   registration of a HTTP and HTTPS flood mitigator as an NSF.  Its
   capabilities are as follows.

   1.  The name of the NSF is http_and_https_flood_mitigation.

   2.  The NSF can control the amount of packets for HTTP and HTTPS
       packets, which are routed to the NSF's IPv4 address or the NSF's
       IPv6 address.

   3.  The NSF can control whether the packets are allowed to pass,
       drop, or alert.

Appendix B.  Acknowledgments

   This work was supported by Institute of Information & Communications
   Technology Planning & Evaluation (IITP) grant funded by the Korea
   MSIT (Ministry of Science and ICT) (R-20160222-002755, Cloud based
   Security Intelligence Technology Development for the Customized
   Security Service Provisioning).  This work was supported in part by
   the IITP grant funded by the MSIT (2020-0-00395, Standard Development
   of Blockchain based Network Management Automation Technology).







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Appendix C.  Contributors

   This document is made by the group effort of I2NSF working group.
   Many people actively contributed to this document, such as Acee
   Lindem, Roman Danyliw, and Tom Petch.  The authors sincerely
   appreciate their contributions.

   The following are co-authors of this document:

   Patrick Lingga
   Department of Computer Science and Engineering
   Sungkyunkwan University
   2066 Seo-ro Jangan-gu
   Suwon, Gyeonggi-do 16419
   Republic of Korea

   EMail: patricklink@skku.edu


   Liang Xia
   Huawei
   101 Software Avenue
   Nanjing, Jiangsu 210012
   China

   EMail: Frank.Xialiang@huawei.com


   Cataldo Basile
   Politecnico di Torino
   Corso Duca degli Abruzzi, 34
   Torino, 10129
   Italy

   EMail: cataldo.basile@polito.it


   John Strassner
   Huawei
   2330 Central Expressway
   Santa Clara, CA 95050
   USA

   EMail: John.sc.Strassner@huawei.com


   Diego R.  Lopez
   Telefonica I+D



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   Zurbaran, 12
   Madrid, 28010
   Spain

   Email: diego.r.lopez@telefonica.com


   Hyoungshick Kim
   Department of Computer Science and Engineering
   Sungkyunkwan University
   2066 Seo-ro Jangan-gu
   Suwon, Gyeonggi-do 16419
   Republic of Korea

   EMail: hyoung@skku.edu


   Daeyoung Hyun
   Department of Computer Science and Engineering
   Sungkyunkwan University
   2066 Seo-ro Jangan-gu
   Suwon, Gyeonggi-do 16419
   Republic of Korea

   EMail: dyhyun@skku.edu


   Dongjin Hong
   Department of Electronic, Electrical and Computer Engineering
   Sungkyunkwan University
   2066 Seo-ro Jangan-gu
   Suwon, Gyeonggi-do 16419
   Republic of Korea

   EMail: dong.jin@skku.edu


   Jung-Soo Park
   Electronics and Telecommunications Research Institute
   218 Gajeong-Ro, Yuseong-Gu
   Daejeon, 34129
   Republic of Korea

   EMail: pjs@etri.re.kr


   Tae-Jin Ahn
   Korea Telecom



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   70 Yuseong-Ro, Yuseong-Gu
   Daejeon, 305-811
   Republic of Korea

   EMail: taejin.ahn@kt.com


   Se-Hui Lee
   Korea Telecom
   70 Yuseong-Ro, Yuseong-Gu
   Daejeon, 305-811
   Republic of Korea

   EMail: sehuilee@kt.com


Authors' Addresses

   Susan Hares (editor)
   Huawei
   7453 Hickory Hill
   Saline, MI  48176
   USA

   Phone: +1-734-604-0332
   EMail: shares@ndzh.com


   Jaehoon Paul Jeong (editor)
   Department of Computer Science and Engineering
   Sungkyunkwan University
   2066 Seobu-Ro, Jangan-Gu
   Suwon, Gyeonggi-Do  16419
   Republic of Korea

   Phone: +82 31 299 4957
   Fax:   +82 31 290 7996
   EMail: pauljeong@skku.edu
   URI:   http://iotlab.skku.edu/people-jaehoon-jeong.php












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Internet-Draft      I2NSF Capability YANG Data Model       November 2020


   Jinyong Tim Kim
   Department of Electronic, Electrical and Computer Engineering
   Sungkyunkwan University
   2066 Seobu-Ro, Jangan-Gu
   Suwon, Gyeonggi-Do  16419
   Republic of Korea

   Phone: +82 10 8273 0930
   EMail: timkim@skku.edu


   Robert Moskowitz
   HTT Consulting
   Oak Park, MI
   USA

   Phone: +1-248-968-9809
   EMail: rgm@htt-consult.com


   Qiushi Lin
   Huawei
   Huawei Industrial Base
   Shenzhen, Guangdong 518129
   China

   EMail: linqiushi@huawei.com
























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