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Versions: 00 01 02 draft-ietf-netmod-acl-model

NETMOD WG                                                  D. Bogdanovic
Internet-Draft                                          Juniper Networks
Intended status: Standards Track                           K. Sreenivasa
Expires: April 10, 2015                    Brocade Communications System
                                                                L. Huang
                                                                D. Blair
                                                           Cisco Systems
                                                         October 7, 2014


           Network Access Control List (ACL) YANG Data Model
                  draft-bogdanovic-netmod-acl-model-02

Abstract

   This document describes a data model of Access Control List (ACL)
   basic building blocks.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   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 April 10, 2015.

Copyright Notice

   Copyright (c) 2014 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
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   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




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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Definitions and Acronyms  . . . . . . . . . . . . . . . .   3
   2.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Design of the ACL Model . . . . . . . . . . . . . . . . . . .   3
     3.1.  ACL Modules . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  ACL YANG Models . . . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  IETF-ACL module . . . . . . . . . . . . . . . . . . . . .   6
     4.2.  Packet Header module  . . . . . . . . . . . . . . . . . .  10
     4.3.  A company proprietary module example  . . . . . . . . . .  14
     4.4.  An ACL Example  . . . . . . . . . . . . . . . . . . . . .  16
   5.  Extending existing model for route filtering  . . . . . . . .  17
   6.  Linux nftables  . . . . . . . . . . . . . . . . . . . . . . .  19
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  20
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  20
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  20
   10. Change log [RFC Editor: Please remove]  . . . . . . . . . . .  21
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  21
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  21
     11.2.  Informative References . . . . . . . . . . . . . . . . .  21
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  21

1.  Introduction

   Access Control List (ACL) is one of the basic elements to configure
   device forwarding behavior.  It is used in many networking concepts
   such as Policy Based Routing, Firewalls etc.

   An ACL is an ordered set of rules that is used to filter traffic on a
   networking device.  Each rule is represented by an Access Control
   Entry (ACE).

   Each ACE has a group of match criteria and a group of action
   criteria.

   The match criteria consist of a tuple of packet header match criteria
   and metadata match criteria.

   o  Packet header matches apply to fields visible in the packet such
      as address or class of service or port numbers.

   o  Metadata matches apply to fields associated with the packet but
      not in the packet header such as input interface or overall packet
      length



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   The actions specify what to do with the packet when the matching
   criteria is met.  These actions are any operations that would apply
   to the packet, such as counting, policing, or simply forwarding.The
   list of potential actions is endless depending on the innovations of
   the networked devices.

1.1.  Definitions and Acronyms

   ACE: Access Control Entry

   ACL: Access Control List

   AFI: Address Field Identifier

   DSCP: Differentiated Services Code Point

   ICMP: Internet Control Message Protocol

   IP: Internet Protocol

   IPv4: Internet Protocol version 4

   IPv6: Internet Protocol version 6

   MAC: Media Access Control

   TCP: Transmission Control Protocol

2.  Problem Statement

   This document defines a YANG [RFC6020] data model for the
   configuration of ACLs.  It is very important that model can be easily
   reused between vendors and between applications.

   ACL implementations in every device may vary greatly in terms of the
   filter constructs and actions that they support.  Therefore this
   draft proposes a simple model that can be augmented by vendor
   proprietary models.

3.  Design of the ACL Model

   Although different vendors have different ACL data models, there is a
   common understanding of what access control list (ACL) is.  A network
   system ususally have a list of ACLs, and each ACL contains an ordered
   list of rules, also known as access list entries - ACEs.  Each ACE
   has a group of match criteria and a group of action criteria.  The
   match criteria consist of packet header matching and metadata
   matching.  Packet header matching applies to fields visible in the



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   packet such as address or class of service or port numbers.  Metadata
   matching applies to fields associated with the packet, but not in the
   packet header such as input interface, packet length, or source or
   destination prefix length.  The actions can be any sort of operation
   from logging to rate limiting or dropping to simply forwarding.
   Actions on the first matching ACE are applied with no processing of
   subsequent ACEs.  The model also includes overall operational state
   for the ACL and operational state for each ACE, targets where the ACL
   applied.  One ACL can be applied to multiple targets within the
   device, such as interfaces of a networked device, applications or
   features running in the device, etc.  When applied to interfaces of a
   networked device, the ACL is applied in a direction which indicates
   if it should be applied to packet entering (input) or leaving the
   device (output).

   This draft tries to address the commonalities between all vendors and
   create a common model, which can be augmented with proprietary
   models.  The base model is very simple and with this design we hope
   to achieve needed flexibility for each vendor to extend the base
   model.

3.1.  ACL Modules

   There are three YANG modules in the model.  The first module, "ietf-
   acl", defines generic ACL aspects which are common to all ACLs
   regardless of their type or vendor.  In effect, the module can be
   viewed as providing a generic ACL "superclass".  It imports the
   second module, "packet-headers".  The match container in "ietf-acl"
   uses groupings in "packet-headers".  The "packet-headers" modules can
   easily be extended to reuse definitions from other modules such as
   IPFIX [RFC5101] or migrate proprietary augmented module definitions
   into the standard module.

module: ietf-acl
   +--rw access-lists
      +--rw access-list* [acl-name]
         +--rw acl-name               string
         +--rw acl-type?              acl-type
         +--ro acl-oper-data
         |  +--ro match-counter?   ietf:counter64
         |  +--ro targets*         string
         +--rw access-list-entries
            +--rw access-list-entry* [rule-name]
               +--rw rule-name        string
               +--rw matches
               |  +--rw (ace-type)?
               |  |  +--:(ace-ip)
               |  |  |  +--rw source-port-range



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               |  |  |  |  +--rw lower-port    inet:port-number
               |  |  |  |  +--rw upper-port?   inet:port-number
               |  |  |  +--rw destination-port-range
               |  |  |  |  +--rw lower-port    inet:port-number
               |  |  |  |  +--rw upper-port?   inet:port-number
               |  |  |  +--rw dscp?                           inet:dscp
               |  |  |  +--rw ip-protocol?                    uint8
               |  |  |  +--rw (ace-ip-version)?
               |  |  |     +--:(ace-ipv4)
               |  |  |     |  +--rw destination-ipv4-address?
                                                            inet:ipv4-prefix
               |  |  |     |  +--rw source-ipv4-address?
                                                           inet:ipv4-prefix
               |  |  |     +--:(ace-ipv6)
               |  |  |        +--rw destination-ipv6-address?
                                                             inet:ipv6-prefix
               |  |  |        +--rw source-ipv6-address?
                                                              inet:ipv6-prefix
               |  |  |        +--rw flow-label?       inet:ipv6-flow-label
               |  |  +--:(ace-eth)
               |  |     +--rw destination-mac-address?
                                                           yang:mac-address
               |  |     +--rw destination-mac-address-mask?
                                                           yang:mac-address
               |  |     +--rw source-mac-address?
                                                            yang:mac-address
               |  |     +--rw source-mac-address-mask?
                                                        yang:mac-address
               |  +--rw input-interface?                string
               |  +--rw absolute
               |     +--rw start?    yang:date-and-time
               |     +--rw end?      yang:date-and-time
               |     +--rw active?   boolean
               +--rw actions
               |  +--rw (packet-handling)?
               |     +--:(deny)
               |     |  +--rw deny?     empty
               |     +--:(permit)
               |        +--rw permit?   empty
               +--ro ace-oper-data
                  +--ro match-counter?   ietf:counter64


   Module "newco-acl" is an example of company proprietary model, that
   augments "ietf-acl" module.  It shows how to add additional match
   criteria, action criteria, and default actions when no ACE matches
   found.  All these are company proprietary extensions or system




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   feature extensions. "newco-acl" is just an example and it is expected
   from vendors to create their own propietary models.

module: newco-acl
augment /ietf-acl:access-list/ietf-acl:access-list-entries/ietf-acl:matches:
   +--rw (protocol_payload_choice)?
      +--:(protocol_payload)
         +--rw protocol_payload* [value_keyword]
            +--rw value_keyword    enumeration
augment /ietf-acl:access-list/ietf-acl:access-list-entries/ietf-acl:actions:
   +--rw (action)?
      +--:(count)
      |  +--rw count?                   string
      +--:(policer)
      |  +--rw policer?                 string
      +--:(hiearchical-policer)
         +--rw hierarchitacl-policer?   string
augment /ietf-acl:access-lists/ietf-acl:access-list:
   +--rw default-actions
      +--rw deny?   empty

4.  ACL YANG Models

4.1.  IETF-ACL module

   "ietf-acl" is the standard top level module for Access lists.  It has
   a container for "access-list" to store access list information.  This
   container has information identifying the access list by a name("acl-
   name") and a list("access-list-entries") of rules associated with the
   "acl-name".  Each of the entries in the list("access-list-entries")
   indexed by the string "rule-name" have containers defining "matches"
   and "actions".  The "matches" define criteria used to identify
   patterns in "packet-fields".  The "actions" define behavior to
   undertake once a "match" has been identified.

   module ietf-acl {
     yang-version 1;

     namespace "urn:ietf:params:xml:ns:yang:ietf-acl";

     prefix acl;

     import ietf-yang-types {
         prefix "ietf";
     }

     import packet-fields {
         prefix "packet-fields";



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     }

     organization
       "IETF NETMOD (NETCONF Data Modeling Language) Working Group";

     contact
       "WG Web: http://tools.ietf.org/wg/netmod/
       WG List: netmod@ietf.org

       WG Chair: Juergen Schoenwaelder
       j.schoenwaelder@jacobs-university.de

       WG Chair: Tom Nadeau
       tnadeau@lucidvision.com

       Editor: Dean Bogdanovic
       deanb@juniper.net

       Editor: Kiran Agrahara Sreenivasa
       kkoushik@brocade.com

       Editor: Lisa Huang
       yihuan@cisco.com

       Editor: Dana Blair
       dblair@cisco.com";

     description
       "This YANG module defines a component that describing the
       configuration of Access Control Lists (ACLs).";

     revision 2014-10-10 {
       description "Creating base model for netmod.";
       reference
         "RFC 6020: YANG - A Data Modeling Language for the
         Network Configuration Protocol (NETCONF)";
     }

     identity acl-base {
       description "Base acl type for all ACL type identifiers.";
     }

     identity ip-acl {
       base "acl:acl-base";
       description "layer 3 ACL type";
     }
    identity eth-acl {
       base "acl:acl-base";



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       description "layer 2 ACL type";
     }

     typedef acl-type {
       type identityref {
         base "acl-base";
       }
       description
         "This type is used to refer to an Access Control List
         (ACL) type";
     }

     typedef acl-ref {
       type leafref {
         path "/acl:access-lists/acl:access-list/acl:acl-name";
       }
       description "This type is used by data models that
       need to referenced an acl";
     }

     container access-lists {
       description
         "Access control lists.";

       list access-list {
         key acl-name;
         description "
           An access list (acl) is an ordered list of
           access list entries (ace). Each ace has a
           sequence number to define the order, list
           of match criteria, and a list of actions.
           Since there are several kinds of acls
           implementeded with different attributes for
           each and different for each vendor, this
           model accomodates customizing acls for
           each kind and for each vendor.
           ";

         leaf acl-name {
           type string;
           description "The name of access-list.
           A device MAY restrict the length and value of
           this name, possibly space and special
           characters are not allowed.";
         }

         leaf acl-type {
           type acl-type;



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           description "Type of ACL";
         }

         container acl-oper-data {
           config false;

           description "Overall ACL operational data";
           leaf match-counter {
             type ietf:counter64;
             description "Total match count for ACL";
           }

           leaf-list targets {
             type string;
             description "List of targets where ACL is applied";
           }
         }

         container access-list-entries {
           description "The access-list-entries container contains
             a list of access-list-entry(ACE).";

             list access-list-entry {
               key rule-name;
               ordered-by user;

               description "List of access list entries(ACE)";
               leaf rule-name {
                 type string;
                 description "Entry name.";
               }

               container matches {
                 description "Define match criteria";
                 choice ace-type {
                   description "Type of ace.";
                   case ace-ip {
                     uses packet-fields:acl-ip-header-fields;
                     choice ace-ip-version {
                       description "Choice of IP version.";
                       case ace-ipv4 {
                         uses packet-fields:acl-ipv4-header-fields;
                       }
                       case ace-ipv6 {
                         uses packet-fields:acl-ipv6-header-fields;
                       }
                     }
                   }



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                   case ace-eth {
                     uses packet-fields:acl-eth-header-fields;
                   }
                 }
                 uses packet-fields:metadata;
             }

             container actions {
               description "Define action criteria";
               choice packet-handling {
                 default deny;

                 description "Packet handling action.";
                 case deny {
                   leaf deny {
                     type empty;
                     description "Deny action.";
                   }
                 }
                 case permit {
                   leaf permit {
                     type empty;
                     description "Permit action.";
                   }
                 }
               }
             }

             container ace-oper-data {
               config false;

               description "Per ace operational data";
               leaf match-counter {
                 type ietf:counter64;
                 description "Number of matches for an ace";
               }
             }
           }
         }
       }
     }
   }

4.2.  Packet Header module

   The packet fields module defines the necessary groups for matching on
   fields in the packet including ethernet, ipv4, ipv6, transport layer
   fields and metadata.  These groupings can be augmented to include



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   other proprietary matching criteria.  Since the number of match
   criteria is very large, the base draft does not include these
   directly but references them by "uses" to keep the base module
   simple.

module packet-fields {
    yang-version 1;

    namespace "urn:ietf:params:xml:ns:yang:packet-fields";

    prefix packet-fields;

    import ietf-inet-types {
        prefix "inet";
    }

    import ietf-yang-types {
        prefix "yang";
    }

    revision 2014-10-10 {
        description "Initial version of packet fields used by access-lists";
    }

    grouping acl-transport-header-fields {
        description "Transport header fields";

        container source-port-range {
             description "inclusive range of source ports";
             leaf lower-port {
                 mandatory true;
                 type inet:port-number;
             }
             leaf upper-port {
                 type inet:port-number;
             }
        }

        container destination-port-range {
             description "inclusive range of destination ports";
             leaf lower-port {
                 mandatory true;
                 type inet:port-number;
             }
             leaf upper-port {
                 type inet:port-number;
             }
        }



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    }

    grouping acl-ip-header-fields {
        description "Header fields common to ipv4 and ipv6";

        uses acl-transport-header-fields;

        leaf dscp {
            type inet:dscp;
        }

        leaf ip-protocol {
            type uint8;
        }

    }

    grouping acl-ipv4-header-fields {
        description "fields in IPv4 header";

        leaf destination-ipv4-address {
            type inet:ipv4-prefix;
        }

        leaf source-ipv4-address {
            type inet:ipv4-prefix;
        }

    }

    grouping acl-ipv6-header-fields {
        description "fields in IPv6 header";

        leaf destination-ipv6-address {
            type inet:ipv6-prefix;
        }

        leaf source-ipv6-address {
            type inet:ipv6-prefix;
        }

        leaf flow-label {
            type inet:ipv6-flow-label;
        }

    }

    grouping acl-eth-header-fields {



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        description "fields in ethernet header";

        leaf destination-mac-address {
            type yang:mac-address;
        }

        leaf destination-mac-address-mask {
            type yang:mac-address;
        }

        leaf source-mac-address {
            type yang:mac-address;
        }

        leaf source-mac-address-mask {
            type yang:mac-address;
        }
    }

    grouping timerange {
        description "Define time range entries to restrict
            the access. The time range is identified by a name
            and then referenced by a function, so that those
            time restrictions are imposed on the function itself.";

        container absolute {
            description
                "Absolute time and date that
                the associated function starts
                going into effect.";

            leaf start {
                type yang:date-and-time;
                description
                "Start time and date";
            }
            leaf end {
                type yang:date-and-time;
                description "Absolute end time and date";
            }
            leaf active {
                type boolean;
                default "true";
                description
                    "Specify the associated function
                    active or inactive state when
                    starts going into effect";
            }



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        } // container absolute
    } //grouping timerange

    grouping metadata {
        description "Fields associated with a packet but not in the header";

        leaf input-interface {
             description "Packet was received on this interface";
             type string;
        }
        uses timerange;
    }
}

4.3.  A company proprietary module example

   In the figure below is an example how proprietary models can be
   created on top of base ACL module.  It is a simple example of how to
   use 'augment' with an XPath expression which extends instances of a
   particular type.  In this example, all /ietf-acl:access-list/ietf-acl
   :access-list-entries/ietf-acl:matches are augmented with a new
   choice, protocol-payload-choice.  The protocol-payload-choice uses a
   grouping with an enumeration of all supported protocol values.  In
   other example, /ietf-acl:access-list/ietf-acl:access-list-entries/
   ietf-acl:actions are augmented with new choice of actions.  Here is
   an inclusive list of cases listed within a choice statement.

module newco-acl {
  yang-version 1;

  namespace "urn:newco:params:xml:ns:yang:newco-acl";

  prefix newco-acl;

  import ietf-acl {
    prefix "ietf-acl";
  }

  revision 2014-05-21{
    description "creating newo proprietary extensions to ietf-acl model";
  }

  augment "/ietf-acl:access-lists/ietf-acl:access-list
  /ietf-acl:access-list-entries/ietf-acl:access-list-entry/ietf-acl:matches" {
    description "Newco proprietry simple filter matches";
    choice protocol-payload-choice {
      list protocol-payload {
        key value-keyword;



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        ordered-by user;
        description "Match protocol payload";
        uses match-simple-payload-protocol-value;
      }
    }
  }

  augment "/ietf-acl:access-lists/ietf-acl:access-list
  /ietf-acl:access-list-entries/ietf-acl:access-list-entry/ietf-acl:actions" {
    description "Newco proprietary simple filter actions";
    choice action {
      case count {
        description "Count the packet in the named counter";
          leaf count {
            type string;
          }
        }
      case policer {
        description "Name of policer to use to rate-limit traffic";
        leaf policer {
          type string;
        }
      }
      case hiearchical-policer {
        description "Name of hierarchical policer to use to rate-limit traffic";
        leaf hierarchitacl-policer{
          type string;
        }
      }
    }
  }

  augment "/ietf-acl:access-lists/ietf-acl:access-list" {
    container default-actions {
      description "Actions that occur if no access-list entry is matched.";
      leaf deny {
        type empty;
      }
    }
  }

  grouping match-simple-payload-protocol-value {
     leaf value-keyword {
       description "(null)";
       type enumeration {
         enum icmp {
           description "Internet Control Message Protocol";
         }



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         enum icmp6 {
           description "Internet Control Message Protocol Version 6";
         }
         enum range {
           description "Range of values";
         }
       }
     }
   }
}

   Dratf authors expect that different vendors will provide their own
   yang models as in the example above, which is the extension of the
   base model

4.4.  An ACL Example

   Requirement: Deny All traffic from 1.1.1.1 bound for host 2.2.2.2
   from leaving.

   In order to achieve the requirement, an name access control list is
   needed.  The acl and aces can be described in CLI as the following:

           access-list ip iacl
           deny tcp host 1.1.1.1 host 2.2.2.2

                                 Figure 1

   Here is the example acl configuration xml:






















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   <rpc message-id="101" xmlns:nc="urn:cisco:params:xml:ns:yang:ietf-acl:1.0">
 // replace with IANA namespace when assigned
   <edit-config>
 <target>
   <running/>
 </target>
 <config>
   <top xmlns="http://example.com/schema/1.2/config">
    <access-lists>
      <access-list>
        <acl-name>sample-ip-acl</acl-name>
        <access-list-entries>
           <access-list-entry>
            <rule-name>telnet-block-rule</rule-name>
            <matches>
              <destination-ipv4-address>2.2.2.2/32</destination-ipv4-address>
              <source-ipv4-address>1.1.1.1/32</source-ipv4-address>
            </matches>
            <actions>
              <deny/>
            <actions/>
          </access-list-entry>
        </access-list-entries>
       </access-list>
     </access-lists>
   </top>
 </config>
   </edit-config>
 </rpc>

                                 Figure 2

5.  Extending existing model for route filtering

   Route filters match on specific IP addresses or ranges of prefixes.
   Much like ACLs, they include some match criteria and corresponding
   match action(s).  For that reason, it is very simple to extend
   existing ACL model with route filtering.  The combination of a route
   prefix and prefix length along with the type of match determines how
   route filters are evaluated against incoming routes.  Different
   vendors have different match types and in this model we are using
   only ones that are common across all vendors participating in this
   draft.  It is easy to extend the model below in the same way how the
   base ACL model can be extended with company proprietary extensions,
   described in the next section.

                module ietf-route-filter {
                  yang-version 1;



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                  namespace "urn:ietf:params:xml:ns:yang:ietf-route-filter";

                  prefix ietf-route-filter;

                  import ietf-inet-types {
                    prefix "ietf-types";
                  }

                  import ietf-acl {
                    prefix "ietf-acl";
                  }
                  organization
                    "IETF NETMOD (NETCONF Data Modeling Language) Working Group";

                  contact
                    "WG Web: http://tools.ietf.org/wg/netmod/
                    WG List: netmod@ietf.org

                    WG Chair: Juergen Schoenwaelder
                    j.schoenwaelder@jacobs-university.de

                    WG Chair: Tom Nadeau
                    tnadeau@lucidvision.com

                    Editor: Dean Bogdanovic
                    deanb@juniper.net

                    Editor: Kiran Agrahara Sreenivasa
                    kkoushik@brocade.com

                    Editor: Lisa Huang
                    yihuan@cisco.com

                    Editor: Dana Blair
                    dblair@cisco.com";

                  description "
                          This module describes route filter as a collection of
                          match prefixes. When specifying a match prefix, you
                          can specify an exact match with a particular route or
                          a less precise match. You can configure either a
                          common action that applies to the entire list or an
                          action associated with each prefix.
                          ";

                  revision 2014-08-15 {
                    description "creating Route-Filter extensions to ietf-acl model";
                    reference " ";



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                  }

                  augment "/ietf-acl:access-list/ietf-acl:access-list-entries/ietf-acl:matches"{
                    description "
                            This module augments the matches container in the ietf-acl
                            module with route filter specific actions
                        ";
                    choice route-prefix{
                      description "Define route filter match criteria";
                      case range {
                        description "
                      Route falls between the lower prefix/prefix-length and the upper
                      prefix/prefix-length.
                      ";
                        choice ipv4-range {
                          description "Defines the lower IPv4 prefix/prefix range";
                      leaf v4-lower-bound {
                        type ietf-types:ipv4-prefix;
                            description "Defines the lower IPv4 prefix/prefix length";
                      }
                      leaf v4-upper-bound {
                        type ietf-types:ipv4-prefix;
                        description "Defines the upper IPv4 prefix/prefix length";
                      }
                    }
                    choice ipv6-range {
                          description "Defines the IPv6 prefix/prefix range";
                      leaf v6-lower-bound {
                        type ietf-types:ipv6-prefix;
                        description "Defines the lower IPv6 prefix/prefix length";
                      }
                      leaf v6-upper-bound {
                        type ietf-types:ipv6-prefix;
                        description "Defines the upper IPv6 prefix/prefix length";
                      }
                    }
                      }
                    }
                  }
                }

6.  Linux nftables

   As Linux platform is becoming more popular as networking platform,
   the Linux data model is changing.  Previously ACLs in Linux were
   highly protocol specific and different utilities were used for it
   (iptables, ip6tables, arptables, ebtables).  Recently, this has
   changed and a single utility, nftables, has been provided.  This



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   utility follows very similarly the same base model as proposed in
   this draft.  The nftables support input and output ACEs and each ACE
   can be defined with match and action.

7.  Security Considerations

   The YANG module defined in this memo is designed to be accessed via
   the NETCONF protocol [RFC6241] [RFC6241].  The lowest NETCONF layer
   is the secure transport layer and the mandatory-to-implement secure
   transport is SSH [RFC6242] [RFC6242].  The NETCONF access control
   model [RFC6536] [RFC6536] provides the means to restrict access for
   particular NETCONF users to a pre-configured subset of all available
   NETCONF protocol operations and content.

   There are a number of data nodes defined in the YANG module which are
   writable/creatable/deletable (i.e., config true, which is the
   default).  These data nodes may be considered sensitive or vulnerable
   in some network environments.  Write operations (e.g., <edit-config>)
   to these data nodes without proper protection can have a negative
   effect on network operations.

   TBD: List specific Subtrees and data nodes and their sensitivity/
   vulnerability.

8.  IANA Considerations

   This document registers a URI in the IETF XML registry [RFC3688]
   [RFC3688].  Following the format in RFC 3688, the following
   registration is requested to be made:

   URI: urn:ietf:params:xml:ns:yang:ietf-acl

   Registrant Contact: The IESG.

   XML: N/A, the requested URI is an XML namespace.

   This document registers a YANG module in the YANG Module Names
   registry [RFC6020].

   name: ietf-acl namespace: urn:ietf:params:xml:ns:yang:ietf-acl
   prefix: ietf-acl reference: RFC XXXX

9.  Acknowledgements

   Alex Clemm, Andy Bierman and Lisa Huang started it by sketching out
   an initial IETF draf in several past IETF meetings.  That draft
   included an ACL YANG model structure and a rich set of match filters,
   and acknowledged contributions by Louis Fourie, Dana Blair, Tula



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   Kraiser, Patrick Gili, George Serpa, Martin Bjorklund, Kent Watsen,
   and Phil Shafer.  Many people have reviewed the various earlier
   drafts that made the draft went into IETF charter.

   Dean Bogdanovic, Kiran Agrahara Sreenivasa, Lisa Huang, and Dana
   Blair each evaluated the YANG model in previous draft separately and
   then work together, to created a new ACL draft that can be supported
   by different vendors.  The new draft removes vendor specific
   features, and gives examples to allow vendors to extend in their own
   proporitory ACL.  The earlier draft was superseded with the new one
   that received more participation from many vendors.

10.  Change log [RFC Editor: Please remove]

11.  References

11.1.  Normative References

   [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
              January 2004.

   [RFC6020]  Bjorklund, M., "YANG - A Data Modeling Language for the
              Network Configuration Protocol (NETCONF)", RFC 6020,
              October 2010.

   [RFC6241]  Enns, R., Bjorklund, M., Schoenwaelder, J., and A.
              Bierman, "Network Configuration Protocol (NETCONF)", RFC
              6241, June 2011.

   [RFC6242]  Wasserman, M., "Using the NETCONF Protocol over Secure
              Shell (SSH)", RFC 6242, June 2011.

   [RFC6536]  Bierman, A. and M. Bjorklund, "Network Configuration
              Protocol (NETCONF) Access Control Model", RFC 6536, March
              2012.

11.2.  Informative References

   [RFC5101]  Claise, B., "Specification of the IP Flow Information
              Export (IPFIX) Protocol for the Exchange of IP Traffic
              Flow Information", RFC 5101, January 2008.

Authors' Addresses

   Dean Bogdanovic
   Juniper Networks

   Email: deanb@juniper.net



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   Kiran Agrahara Sreenivasa
   Brocade Communications System

   Email: kkoushik@brocade.com


   Lisa Huang
   Cisco Systems

   Email: yihuan@cisco.com


   Dana Blair
   Cisco Systems

   Email: dblair@cisco.com



































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