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rfc:rfc8344

Internet Engineering Task Force (IETF) M. Bjorklund Request for Comments: 8344 Tail-f Systems Obsoletes: 7277 March 2018 Category: Standards Track ISSN: 2070-1721

                A YANG Data Model for IP Management

Abstract

 This document defines a YANG data model for management of IP
 implementations.  The data model includes configuration and system
 state.
 The YANG data model in this document conforms to the Network
 Management Datastore Architecture defined in RFC 8342.
 This document obsoletes RFC 7277.

Status of This Memo

 This is an Internet Standards Track document.
 This document is a product of the Internet Engineering Task Force
 (IETF).  It represents the consensus of the IETF community.  It has
 received public review and has been approved for publication by the
 Internet Engineering Steering Group (IESG).  Further information on
 Internet Standards is available in Section 2 of RFC 7841.
 Information about the current status of this document, any errata,
 and how to provide feedback on it may be obtained at
 https://www.rfc-editor.org/info/rfc8344.

Copyright Notice

 Copyright (c) 2018 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
 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.

Bjorklund Standards Track [Page 1] RFC 8344 YANG IP Management March 2018

Table of Contents

 1. Introduction ....................................................2
    1.1. Summary of Changes from RFC 7277 ...........................2
    1.2. Terminology ................................................3
    1.3. Tree Diagrams ..............................................3
 2. IP Data Model ...................................................4
 3. Relationship to the IP-MIB ......................................5
 4. IP Management YANG Module .......................................7
 5. IANA Considerations ............................................27
 6. Security Considerations ........................................27
 7. References .....................................................29
    7.1. Normative References ......................................29
    7.2. Informative References ....................................31
 Appendix A. Example: NETCONF <get-config> Reply ...................32
 Appendix B. Example: NETCONF <get-data> Reply .....................33
 Acknowledgments ...................................................34
 Author's Address ..................................................34

1. Introduction

 This document defines a YANG data model [RFC7950] for management of
 IP implementations.
 The data model covers configuration of per-interface IPv4 and IPv6
 parameters as well as mappings of IP addresses to link-layer
 addresses.  It also provides information about which IP addresses are
 operationally used and which link-layer mappings exist.
 Per-interface parameters are added through augmentation of the
 interface data model defined in [RFC8343].
 This version of the IP data model supports the Network Management
 Datastore Architecture (NMDA) [RFC8342].

1.1. Summary of Changes from RFC 7277

 The "ipv4" and "ipv6" subtrees with "config false" data nodes in the
 "/interfaces-state/interface" subtree are deprecated.  All
 "config false" data nodes are now present in the "ipv4" and "ipv6"
 subtrees in the "/interfaces/interface" subtree.
 Servers that do not implement NMDA or that wish to support clients
 that do not implement NMDA MAY implement the deprecated "ipv4" and
 "ipv6" subtrees in the "/interfaces-state/interface" subtree.

Bjorklund Standards Track [Page 2] RFC 8344 YANG IP Management March 2018

1.2. Terminology

 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
 "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
 "OPTIONAL" in this document are to be interpreted as described in
 BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
 capitals, as shown here.
 The following terms are defined in [RFC8342] and are not redefined
 here:
 o  client
 o  server
 o  configuration
 o  system state
 o  intended configuration
 o  running configuration datastore
 o  operational state
 o  operational state datastore
 The following terms are defined in [RFC7950] and are not redefined
 here:
 o  augment
 o  data model
 o  data node
 The terminology for describing YANG data models is found in
 [RFC7950].

1.3. Tree Diagrams

 Tree diagrams used in this document follow the notation defined in
 [RFC8340].

Bjorklund Standards Track [Page 3] RFC 8344 YANG IP Management March 2018

2. IP Data Model

 This document defines the YANG module "ietf-ip", which augments the
 "interface" lists defined in the "ietf-interfaces" module [RFC8343]
 with IP-specific data nodes.
 The data model has the following structure for IP data nodes per
 interface, excluding the deprecated data nodes:
 module: ietf-ip
   augment /if:interfaces/if:interface:
     +--rw ipv4!
     |  +--rw enabled?      boolean
     |  +--rw forwarding?   boolean
     |  +--rw mtu?          uint16
     |  +--rw address* [ip]
     |  |  +--rw ip               inet:ipv4-address-no-zone
     |  |  +--rw (subnet)
     |  |  |  +--:(prefix-length)
     |  |  |  |  +--rw prefix-length?   uint8
     |  |  |  +--:(netmask)
     |  |  |     +--rw netmask?         yang:dotted-quad
     |  |  |             {ipv4-non-contiguous-netmasks}?
     |  |  +--ro origin?          ip-address-origin
     |  +--rw neighbor* [ip]
     |     +--rw ip                    inet:ipv4-address-no-zone
     |     +--rw link-layer-address    yang:phys-address
     |     +--ro origin?               neighbor-origin
     +--rw ipv6!
        +--rw enabled?                     boolean
        +--rw forwarding?                  boolean
        +--rw mtu?                         uint32
        +--rw address* [ip]
        |  +--rw ip               inet:ipv6-address-no-zone
        |  +--rw prefix-length    uint8
        |  +--ro origin?          ip-address-origin
        |  +--ro status?          enumeration
        +--rw neighbor* [ip]
        |  +--rw ip                    inet:ipv6-address-no-zone
        |  +--rw link-layer-address    yang:phys-address
        |  +--ro origin?               neighbor-origin
        |  +--ro is-router?            empty
        |  +--ro state?                enumeration
        +--rw dup-addr-detect-transmits?   uint32

Bjorklund Standards Track [Page 4] RFC 8344 YANG IP Management March 2018

        +--rw autoconf
           +--rw create-global-addresses?        boolean
           +--rw create-temporary-addresses?     boolean
           |       {ipv6-privacy-autoconf}?
           +--rw temporary-valid-lifetime?       uint32
           |       {ipv6-privacy-autoconf}?
           +--rw temporary-preferred-lifetime?   uint32
                   {ipv6-privacy-autoconf}?
 The data model defines two containers per interface -- "ipv4" and
 "ipv6", representing the IPv4 and IPv6 address families.  In each
 container, there is a leaf "enabled" that controls whether or not the
 address family is enabled on that interface, and a leaf "forwarding"
 that controls whether or not IP packet forwarding for the address
 family is enabled on the interface.  In each container, there is also
 a list of addresses and a list of mappings from IP addresses to
 link-layer addresses.

3. Relationship to the IP-MIB

 If the device implements the IP-MIB [RFC4293], each entry in the
 "ipv4/address" and "ipv6/address" lists is mapped to one
 ipAddressEntry, where the ipAddressIfIndex refers to the "address"
 entry's interface.
 The IP-MIB defines objects to control IPv6 Router Advertisement
 messages.  The corresponding YANG data nodes are defined in
 [RFC8022].
 The entries in "ipv4/neighbor" and "ipv6/neighbor" are mapped to
 ipNetToPhysicalTable.

Bjorklund Standards Track [Page 5] RFC 8344 YANG IP Management March 2018

 The following table lists the YANG data nodes with corresponding
 objects in the IP-MIB.
 +----------------------------------+--------------------------------+
 | YANG data node in                | IP-MIB object                  |
 | /if:interfaces/if:interface      |                                |
 +----------------------------------+--------------------------------+
 | ipv4                             | ipv4InterfaceEnableStatus      |
 | ipv4/enabled                     | ipv4InterfaceEnableStatus      |
 | ipv4/address                     | ipAddressEntry                 |
 | ipv4/address/ip                  | ipAddressAddrType              |
 |                                  | ipAddressAddr                  |
 | ipv4/neighbor                    | ipNetToPhysicalEntry           |
 | ipv4/neighbor/ip                 | ipNetToPhysicalNetAddressType  |
 |                                  | ipNetToPhysicalNetAddress      |
 | ipv4/neighbor/link-layer-address | ipNetToPhysicalPhysAddress     |
 | ipv4/neighbor/origin             | ipNetToPhysicalType            |
 | ipv6                             | ipv6InterfaceEnableStatus      |
 | ipv6/enabled                     | ipv6InterfaceEnableStatus      |
 | ipv6/forwarding                  | ipv6InterfaceForwarding        |
 | ipv6/address                     | ipAddressEntry                 |
 | ipv6/address/ip                  | ipAddressAddrType              |
 |                                  | ipAddressAddr                  |
 | ipv4/address/origin              | ipAddressOrigin                |
 | ipv6/address/status              | ipAddressStatus                |
 | ipv6/neighbor                    | ipNetToPhysicalEntry           |
 | ipv6/neighbor/ip                 | ipNetToPhysicalNetAddressType  |
 |                                  | ipNetToPhysicalNetAddress      |
 | ipv6/neighbor/link-layer-address | ipNetToPhysicalPhysAddress     |
 | ipv6/neighbor/origin             | ipNetToPhysicalType            |
 | ipv6/neighbor/state              | ipNetToPhysicalState           |
 +----------------------------------+--------------------------------+
         YANG Interface Data Nodes and Related IP-MIB Objects

Bjorklund Standards Track [Page 6] RFC 8344 YANG IP Management March 2018

4. IP Management YANG Module

 This module imports typedefs from [RFC6991] and [RFC8343], and it
 references [RFC791], [RFC826], [RFC4861], [RFC4862], [RFC4941],
 [RFC7217], and [RFC8200].
 <CODE BEGINS> file "ietf-ip@2018-02-22.yang"
 module ietf-ip {
   yang-version 1.1;
   namespace "urn:ietf:params:xml:ns:yang:ietf-ip";
   prefix ip;
   import ietf-interfaces {
     prefix if;
   }
   import ietf-inet-types {
     prefix inet;
   }
   import ietf-yang-types {
     prefix yang;
   }
   organization
     "IETF NETMOD (Network Modeling) Working Group";
   contact
     "WG Web:   <https://datatracker.ietf.org/wg/netmod/>
      WG List:  <mailto:netmod@ietf.org>
      Editor:   Martin Bjorklund
                <mailto:mbj@tail-f.com>";
   description
     "This module contains a collection of YANG definitions for
      managing IP implementations.
      Copyright (c) 2018 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
      Relating to IETF Documents
      (https://trustee.ietf.org/license-info).
      This version of this YANG module is part of RFC 8344; see
      the RFC itself for full legal notices.";

Bjorklund Standards Track [Page 7] RFC 8344 YANG IP Management March 2018

   revision 2018-02-22 {
     description
       "Updated to support NMDA.";
     reference
       "RFC 8344: A YANG Data Model for IP Management";
   }
   revision 2014-06-16 {
     description
       "Initial revision.";
     reference
       "RFC 7277: A YANG Data Model for IP Management";
   }
   /*
    * Features
    */
   feature ipv4-non-contiguous-netmasks {
     description
       "Indicates support for configuring non-contiguous
        subnet masks.";
   }
   feature ipv6-privacy-autoconf {
     description
       "Indicates support for privacy extensions for stateless address
        autoconfiguration in IPv6.";
     reference
       "RFC 4941: Privacy Extensions for Stateless Address
                  Autoconfiguration in IPv6";
   }
   /*
    * Typedefs
    */
   typedef ip-address-origin {
     type enumeration {
       enum other {
         description
           "None of the following.";
       }

Bjorklund Standards Track [Page 8] RFC 8344 YANG IP Management March 2018

       enum static {
         description
           "Indicates that the address has been statically
            configured -- for example, using the Network Configuration
            Protocol (NETCONF) or a command line interface.";
       }
       enum dhcp {
         description
           "Indicates an address that has been assigned to this
            system by a DHCP server.";
       }
       enum link-layer {
         description
           "Indicates an address created by IPv6 stateless
            autoconfiguration that embeds a link-layer address in its
            interface identifier.";
       }
       enum random {
         description
           "Indicates an address chosen by the system at
            random, e.g., an IPv4 address within 169.254/16, a
            temporary address as described in RFC 4941, or a
            semantically opaque address as described in RFC 7217.";
         reference
           "RFC 4941: Privacy Extensions for Stateless Address
                      Autoconfiguration in IPv6
            RFC 7217: A Method for Generating Semantically Opaque
                      Interface Identifiers with IPv6 Stateless
                      Address Autoconfiguration (SLAAC)";
       }
     }
     description
       "The origin of an address.";
   }
   typedef neighbor-origin {
     type enumeration {
       enum other {
         description
           "None of the following.";
       }
       enum static {
         description
           "Indicates that the mapping has been statically
            configured -- for example, using NETCONF or a command line
            interface.";
       }

Bjorklund Standards Track [Page 9] RFC 8344 YANG IP Management March 2018

       enum dynamic {
         description
           "Indicates that the mapping has been dynamically resolved
            using, for example, IPv4 ARP or the IPv6 Neighbor
            Discovery protocol.";
       }
     }
     description
       "The origin of a neighbor entry.";
   }
   /*
    * Data nodes
    */
   augment "/if:interfaces/if:interface" {
     description
       "IP parameters on interfaces.
        If an interface is not capable of running IP, the server
        must not allow the client to configure these parameters.";
     container ipv4 {
       presence
         "Enables IPv4 unless the 'enabled' leaf
          (which defaults to 'true') is set to 'false'";
       description
         "Parameters for the IPv4 address family.";
       leaf enabled {
         type boolean;
         default true;
         description
           "Controls whether IPv4 is enabled or disabled on this
            interface.  When IPv4 is enabled, this interface is
            connected to an IPv4 stack, and the interface can send
            and receive IPv4 packets.";
       }
       leaf forwarding {
         type boolean;
         default false;
         description
           "Controls IPv4 packet forwarding of datagrams received by,
            but not addressed to, this interface.  IPv4 routers
            forward datagrams.  IPv4 hosts do not (except those
            source-routed via the host).";
       }

Bjorklund Standards Track [Page 10] RFC 8344 YANG IP Management March 2018

       leaf mtu {
         type uint16 {
           range "68..max";
         }
         units "octets";
         description
           "The size, in octets, of the largest IPv4 packet that the
            interface will send and receive.
            The server may restrict the allowed values for this leaf,
            depending on the interface's type.
            If this leaf is not configured, the operationally used MTU
            depends on the interface's type.";
         reference
           "RFC 791: Internet Protocol";
       }
       list address {
         key "ip";
         description
           "The list of IPv4 addresses on the interface.";
         leaf ip {
           type inet:ipv4-address-no-zone;
           description
             "The IPv4 address on the interface.";
         }
         choice subnet {
           mandatory true;
           description
             "The subnet can be specified as a prefix length or,
              if the server supports non-contiguous netmasks, as
              a netmask.";
           leaf prefix-length {
             type uint8 {
               range "0..32";
             }
             description
               "The length of the subnet prefix.";
           }
           leaf netmask {
             if-feature ipv4-non-contiguous-netmasks;
             type yang:dotted-quad;
             description
               "The subnet specified as a netmask.";
           }
         }

Bjorklund Standards Track [Page 11] RFC 8344 YANG IP Management March 2018

         leaf origin {
           type ip-address-origin;
           config false;
           description
             "The origin of this address.";
         }
       }
       list neighbor {
         key "ip";
         description
           "A list of mappings from IPv4 addresses to
            link-layer addresses.
            Entries in this list in the intended configuration are
            used as static entries in the ARP Cache.
            In the operational state, this list represents the ARP
            Cache.";
         reference
           "RFC 826: An Ethernet Address Resolution Protocol";
         leaf ip {
           type inet:ipv4-address-no-zone;
           description
             "The IPv4 address of the neighbor node.";
         }
         leaf link-layer-address {
           type yang:phys-address;
           mandatory true;
           description
             "The link-layer address of the neighbor node.";
         }
         leaf origin {
           type neighbor-origin;
           config false;
           description
             "The origin of this neighbor entry.";
         }
       }
     }

Bjorklund Standards Track [Page 12] RFC 8344 YANG IP Management March 2018

     container ipv6 {
       presence
         "Enables IPv6 unless the 'enabled' leaf
          (which defaults to 'true') is set to 'false'";
       description
         "Parameters for the IPv6 address family.";
       leaf enabled {
         type boolean;
         default true;
         description
           "Controls whether IPv6 is enabled or disabled on this
            interface.  When IPv6 is enabled, this interface is
            connected to an IPv6 stack, and the interface can send
            and receive IPv6 packets.";
       }
       leaf forwarding {
         type boolean;
         default false;
         description
           "Controls IPv6 packet forwarding of datagrams received by,
            but not addressed to, this interface.  IPv6 routers
            forward datagrams.  IPv6 hosts do not (except those
            source-routed via the host).";
         reference
           "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
                      Section 6.2.1, IsRouter";
       }
       leaf mtu {
         type uint32 {
           range "1280..max";
         }
         units "octets";
         description
           "The size, in octets, of the largest IPv6 packet that the
            interface will send and receive.
            The server may restrict the allowed values for this leaf,
            depending on the interface's type.
            If this leaf is not configured, the operationally used MTU
            depends on the interface's type.";
         reference
           "RFC 8200: Internet Protocol, Version 6 (IPv6)
                      Specification
                      Section 5";
       }

Bjorklund Standards Track [Page 13] RFC 8344 YANG IP Management March 2018

       list address {
         key "ip";
         description
           "The list of IPv6 addresses on the interface.";
         leaf ip {
           type inet:ipv6-address-no-zone;
           description
             "The IPv6 address on the interface.";
         }
         leaf prefix-length {
           type uint8 {
             range "0..128";
           }
           mandatory true;
           description
             "The length of the subnet prefix.";
         }
         leaf origin {
           type ip-address-origin;
           config false;
           description
             "The origin of this address.";
         }
         leaf status {
           type enumeration {
             enum preferred {
               description
                 "This is a valid address that can appear as the
                  destination or source address of a packet.";
             }
             enum deprecated {
               description
                 "This is a valid but deprecated address that should
                  no longer be used as a source address in new
                  communications, but packets addressed to such an
                  address are processed as expected.";
             }
             enum invalid {
               description
                 "This isn't a valid address, and it shouldn't appear
                  as the destination or source address of a packet.";
             }

Bjorklund Standards Track [Page 14] RFC 8344 YANG IP Management March 2018

             enum inaccessible {
               description
                 "The address is not accessible because the interface
                  to which this address is assigned is not
                  operational.";
             }
             enum unknown {
               description
                 "The status cannot be determined for some reason.";
             }
             enum tentative {
               description
                 "The uniqueness of the address on the link is being
                  verified.  Addresses in this state should not be
                  used for general communication and should only be
                  used to determine the uniqueness of the address.";
             }
             enum duplicate {
               description
                 "The address has been determined to be non-unique on
                  the link and so must not be used.";
             }
             enum optimistic {
               description
                 "The address is available for use, subject to
                  restrictions, while its uniqueness on a link is
                  being verified.";
             }
           }
           config false;
           description
             "The status of an address.  Most of the states correspond
              to states from the IPv6 Stateless Address
              Autoconfiguration protocol.";
           reference
             "RFC 4293: Management Information Base for the
                        Internet Protocol (IP)
                        - IpAddressStatusTC
              RFC 4862: IPv6 Stateless Address Autoconfiguration";
         }
       }

Bjorklund Standards Track [Page 15] RFC 8344 YANG IP Management March 2018

       list neighbor {
         key "ip";
         description
           "A list of mappings from IPv6 addresses to
            link-layer addresses.
            Entries in this list in the intended configuration are
            used as static entries in the Neighbor Cache.
            In the operational state, this list represents the
            Neighbor Cache.";
         reference
           "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)";
         leaf ip {
           type inet:ipv6-address-no-zone;
           description
             "The IPv6 address of the neighbor node.";
         }
         leaf link-layer-address {
           type yang:phys-address;
           mandatory true;
           description
             "The link-layer address of the neighbor node.
              In the operational state, if the neighbor's 'state' leaf
              is 'incomplete', this leaf is not instantiated.";
         }
         leaf origin {
           type neighbor-origin;
           config false;
           description
             "The origin of this neighbor entry.";
         }
         leaf is-router {
           type empty;
           config false;
           description
             "Indicates that the neighbor node acts as a router.";
         }

Bjorklund Standards Track [Page 16] RFC 8344 YANG IP Management March 2018

         leaf state {
           type enumeration {
             enum incomplete {
               description
                 "Address resolution is in progress, and the
                  link-layer address of the neighbor has not yet been
                  determined.";
             }
             enum reachable {
               description
                 "Roughly speaking, the neighbor is known to have been
                  reachable recently (within tens of seconds ago).";
             }
             enum stale {
               description
                 "The neighbor is no longer known to be reachable, but
                  until traffic is sent to the neighbor no attempt
                  should be made to verify its reachability.";
             }
             enum delay {
               description
                 "The neighbor is no longer known to be reachable, and
                  traffic has recently been sent to the neighbor.
                  Rather than probe the neighbor immediately, however,
                  delay sending probes for a short while in order to
                  give upper-layer protocols a chance to provide
                  reachability confirmation.";
             }
             enum probe {
               description
                 "The neighbor is no longer known to be reachable, and
                  unicast Neighbor Solicitation probes are being sent
                  to verify reachability.";
             }
           }
           config false;
           description
             "The Neighbor Unreachability Detection state of this
              entry.";
           reference
             "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
                        Section 7.3.2";
         }
       }

Bjorklund Standards Track [Page 17] RFC 8344 YANG IP Management March 2018

       leaf dup-addr-detect-transmits {
         type uint32;
         default 1;
         description
           "The number of consecutive Neighbor Solicitation messages
            sent while performing Duplicate Address Detection on a
            tentative address.  A value of zero indicates that
            Duplicate Address Detection is not performed on
            tentative addresses.  A value of one indicates a single
            transmission with no follow-up retransmissions.";
         reference
           "RFC 4862: IPv6 Stateless Address Autoconfiguration";
       }
       container autoconf {
         description
           "Parameters to control the autoconfiguration of IPv6
            addresses, as described in RFC 4862.";
         reference
           "RFC 4862: IPv6 Stateless Address Autoconfiguration";
         leaf create-global-addresses {
           type boolean;
           default true;
           description
             "If enabled, the host creates global addresses as
              described in RFC 4862.";
           reference
             "RFC 4862: IPv6 Stateless Address Autoconfiguration
                        Section 5.5";
         }
         leaf create-temporary-addresses {
           if-feature ipv6-privacy-autoconf;
           type boolean;
           default false;
           description
             "If enabled, the host creates temporary addresses as
              described in RFC 4941.";
           reference
             "RFC 4941: Privacy Extensions for Stateless Address
                        Autoconfiguration in IPv6";
         }

Bjorklund Standards Track [Page 18] RFC 8344 YANG IP Management March 2018

         leaf temporary-valid-lifetime {
           if-feature ipv6-privacy-autoconf;
           type uint32;
           units "seconds";
           default 604800;
           description
             "The time period during which the temporary address
              is valid.";
           reference
             "RFC 4941: Privacy Extensions for Stateless Address
                        Autoconfiguration in IPv6
                        - TEMP_VALID_LIFETIME";
         }
         leaf temporary-preferred-lifetime {
           if-feature ipv6-privacy-autoconf;
           type uint32;
           units "seconds";
           default 86400;
           description
             "The time period during which the temporary address is
              preferred.";
           reference
             "RFC 4941: Privacy Extensions for Stateless Address
                        Autoconfiguration in IPv6
                        - TEMP_PREFERRED_LIFETIME";
         }
       }
     }
   }

Bjorklund Standards Track [Page 19] RFC 8344 YANG IP Management March 2018

   /*
    * Legacy operational state data nodes
    */
   augment "/if:interfaces-state/if:interface" {
     status deprecated;
     description
       "Data nodes for the operational state of IP on interfaces.";
     container ipv4 {
       presence
         "Present if IPv4 is enabled on this interface";
       config false;
       status deprecated;
       description
         "Interface-specific parameters for the IPv4 address family.";
       leaf forwarding {
         type boolean;
         status deprecated;
         description
           "Indicates whether IPv4 packet forwarding is enabled or
            disabled on this interface.";
       }
       leaf mtu {
         type uint16 {
           range "68..max";
         }
         units "octets";
         status deprecated;
         description
           "The size, in octets, of the largest IPv4 packet that the
            interface will send and receive.";
         reference
           "RFC 791: Internet Protocol";
       }
       list address {
         key "ip";
         status deprecated;
         description
           "The list of IPv4 addresses on the interface.";
         leaf ip {
           type inet:ipv4-address-no-zone;
           status deprecated;
           description
             "The IPv4 address on the interface.";
         }

Bjorklund Standards Track [Page 20] RFC 8344 YANG IP Management March 2018

         choice subnet {
           status deprecated;
           description
             "The subnet can be specified as a prefix length or,
              if the server supports non-contiguous netmasks, as
              a netmask.";
           leaf prefix-length {
             type uint8 {
               range "0..32";
             }
             status deprecated;
             description
               "The length of the subnet prefix.";
           }
           leaf netmask {
             if-feature ipv4-non-contiguous-netmasks;
             type yang:dotted-quad;
             status deprecated;
             description
               "The subnet specified as a netmask.";
           }
         }
         leaf origin {
           type ip-address-origin;
           status deprecated;
           description
             "The origin of this address.";
         }
       }
       list neighbor {
         key "ip";
         status deprecated;
         description
           "A list of mappings from IPv4 addresses to
            link-layer addresses.
            This list represents the ARP Cache.";
         reference
           "RFC 826: An Ethernet Address Resolution Protocol";
         leaf ip {
           type inet:ipv4-address-no-zone;
           status deprecated;
           description
             "The IPv4 address of the neighbor node.";
         }

Bjorklund Standards Track [Page 21] RFC 8344 YANG IP Management March 2018

         leaf link-layer-address {
           type yang:phys-address;
           status deprecated;
           description
             "The link-layer address of the neighbor node.";
         }
         leaf origin {
           type neighbor-origin;
           status deprecated;
           description
             "The origin of this neighbor entry.";
         }
       }
     }
     container ipv6 {
       presence
         "Present if IPv6 is enabled on this interface";
       config false;
       status deprecated;
       description
         "Parameters for the IPv6 address family.";
       leaf forwarding {
         type boolean;
         default false;
         status deprecated;
         description
           "Indicates whether IPv6 packet forwarding is enabled or
            disabled on this interface.";
         reference
           "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
                      Section 6.2.1, IsRouter";
       }
       leaf mtu {
         type uint32 {
           range "1280..max";
         }
         units "octets";
         status deprecated;
         description
           "The size, in octets, of the largest IPv6 packet that the
            interface will send and receive.";
         reference
           "RFC 8200: Internet Protocol, Version 6 (IPv6)
                      Specification
                      Section 5";
       }

Bjorklund Standards Track [Page 22] RFC 8344 YANG IP Management March 2018

       list address {
         key "ip";
         status deprecated;
         description
           "The list of IPv6 addresses on the interface.";
         leaf ip {
           type inet:ipv6-address-no-zone;
           status deprecated;
           description
             "The IPv6 address on the interface.";
         }
         leaf prefix-length {
           type uint8 {
             range "0..128";
           }
           mandatory true;
           status deprecated;
           description
             "The length of the subnet prefix.";
         }
         leaf origin {
           type ip-address-origin;
           status deprecated;
           description
             "The origin of this address.";
         }
         leaf status {
           type enumeration {
             enum preferred {
               description
                 "This is a valid address that can appear as the
                  destination or source address of a packet.";
             }
             enum deprecated {
               description
                 "This is a valid but deprecated address that should
                  no longer be used as a source address in new
                  communications, but packets addressed to such an
                  address are processed as expected.";
             }
             enum invalid {
               description
                 "This isn't a valid address, and it shouldn't appear
                  as the destination or source address of a packet.";
             }

Bjorklund Standards Track [Page 23] RFC 8344 YANG IP Management March 2018

             enum inaccessible {
               description
                 "The address is not accessible because the interface
                  to which this address is assigned is not
                  operational.";
             }
             enum unknown {
               description
                 "The status cannot be determined for some reason.";
             }
             enum tentative {
               description
                 "The uniqueness of the address on the link is being
                  verified.  Addresses in this state should not be
                  used for general communication and should only be
                  used to determine the uniqueness of the address.";
             }
             enum duplicate {
               description
                 "The address has been determined to be non-unique on
                  the link and so must not be used.";
             }
             enum optimistic {
               description
                 "The address is available for use, subject to
                  restrictions, while its uniqueness on a link is
                  being verified.";
             }
           }
           status deprecated;
           description
             "The status of an address.  Most of the states correspond
              to states from the IPv6 Stateless Address
              Autoconfiguration protocol.";
           reference
             "RFC 4293: Management Information Base for the
                        Internet Protocol (IP)
                        - IpAddressStatusTC
              RFC 4862: IPv6 Stateless Address Autoconfiguration";
         }
       }

Bjorklund Standards Track [Page 24] RFC 8344 YANG IP Management March 2018

       list neighbor {
         key "ip";
         status deprecated;
         description
           "A list of mappings from IPv6 addresses to
            link-layer addresses.
            This list represents the Neighbor Cache.";
         reference
           "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)";
         leaf ip {
           type inet:ipv6-address-no-zone;
           status deprecated;
           description
             "The IPv6 address of the neighbor node.";
         }
         leaf link-layer-address {
           type yang:phys-address;
           status deprecated;
           description
             "The link-layer address of the neighbor node.";
         }
         leaf origin {
           type neighbor-origin;
           status deprecated;
           description
             "The origin of this neighbor entry.";
         }
         leaf is-router {
           type empty;
           status deprecated;
           description
             "Indicates that the neighbor node acts as a router.";
         }
         leaf state {
           type enumeration {
             enum incomplete {
               description
                 "Address resolution is in progress, and the
                  link-layer address of the neighbor has not yet been
                  determined.";
             }
             enum reachable {
               description
                 "Roughly speaking, the neighbor is known to have been
                  reachable recently (within tens of seconds ago).";
             }

Bjorklund Standards Track [Page 25] RFC 8344 YANG IP Management March 2018

             enum stale {
               description
                 "The neighbor is no longer known to be reachable, but
                  until traffic is sent to the neighbor no attempt
                  should be made to verify its reachability.";
             }
             enum delay {
               description
                 "The neighbor is no longer known to be reachable, and
                  traffic has recently been sent to the neighbor.
                  Rather than probe the neighbor immediately, however,
                  delay sending probes for a short while in order to
                  give upper-layer protocols a chance to provide
                  reachability confirmation.";
             }
             enum probe {
               description
                 "The neighbor is no longer known to be reachable, and
                  unicast Neighbor Solicitation probes are being sent
                  to verify reachability.";
             }
           }
           status deprecated;
           description
             "The Neighbor Unreachability Detection state of this
              entry.";
           reference
             "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
                        Section 7.3.2";
         }
       }
     }
   }
 }
 <CODE ENDS>

Bjorklund Standards Track [Page 26] RFC 8344 YANG IP Management March 2018

5. IANA Considerations

 This document registers a URI in the "IETF XML Registry" [RFC3688].
 Following the format in RFC 3688, the following registration has been
 made.
    URI: urn:ietf:params:xml:ns:yang:ietf-ip
    Registrant Contact: The NETMOD WG of the IETF.
    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-ip
    Namespace:    urn:ietf:params:xml:ns:yang:ietf-ip
    Prefix:       ip
    Reference:    RFC 8344

6. Security Considerations

 The YANG module specified in this document defines a schema for data
 that is designed to be accessed via network management protocols such
 as NETCONF [RFC6241] or RESTCONF [RFC8040].  The lowest NETCONF layer
 is the secure transport layer, and the mandatory-to-implement secure
 transport is Secure Shell (SSH) [RFC6242].  The lowest RESTCONF layer
 is HTTPS, and the mandatory-to-implement secure transport is TLS
 [RFC5246].
 The NETCONF access control model [RFC8341] provides the means to
 restrict access for particular 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/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.  These are the subtrees and data nodes
 and their sensitivity/vulnerability:
 ipv4/enabled and ipv6/enabled:  These leafs are used to enable or
    disable IPv4 and IPv6 on a specific interface.  By enabling a
    protocol on an interface, an attacker might be able to create an
    unsecured path into a node (or through it if routing is also
    enabled).  By disabling a protocol on an interface, an attacker

Bjorklund Standards Track [Page 27] RFC 8344 YANG IP Management March 2018

    might be able to force packets to be routed through some other
    interface or deny access to some or all of the network via that
    protocol.
 ipv4/address and ipv6/address:  These lists specify the configured IP
    addresses on an interface.  By modifying this information, an
    attacker can cause a node to either ignore messages destined to it
    or accept (at least at the IP layer) messages it would otherwise
    ignore.  The use of filtering or security associations may reduce
    the potential damage in the latter case.
 ipv4/forwarding and ipv6/forwarding:  These leafs allow a client to
    enable or disable the forwarding functions on the entity.  By
    disabling the forwarding functions, an attacker would possibly be
    able to deny service to users.  By enabling the forwarding
    functions, an attacker could open a conduit into an area.  This
    might result in the area providing transit for packets it
    shouldn't, or it might allow the attacker access to the area,
    bypassing security safeguards.
 ipv6/autoconf:  The leafs in this branch control the
    autoconfiguration of IPv6 addresses and, in particular, whether or
    not temporary addresses are used.  By modifying the corresponding
    leafs, an attacker might impact the addresses used by a node and
    -- thus, indirectly -- the privacy of the users using the node.
 ipv4/mtu and ipv6/mtu:  Setting these leafs to very small values can
    be used to slow down interfaces.

Bjorklund Standards Track [Page 28] RFC 8344 YANG IP Management March 2018

7. References

7.1. Normative References

 [RFC791]   Postel, J., "Internet Protocol", STD 5, RFC 791,
            DOI 10.17487/RFC0791, September 1981,
            <https://www.rfc-editor.org/info/rfc791>.
 [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>.
 [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
            DOI 10.17487/RFC3688, January 2004,
            <https://www.rfc-editor.org/info/rfc3688>.
 [RFC4861]  Narten, T., Nordmark, E., Simpson, W., and H. Soliman,
            "Neighbor Discovery for IP version 6 (IPv6)", RFC 4861,
            DOI 10.17487/RFC4861, September 2007,
            <https://www.rfc-editor.org/info/rfc4861>.
 [RFC4862]  Thomson, S., Narten, T., and T. Jinmei, "IPv6 Stateless
            Address Autoconfiguration", RFC 4862,
            DOI 10.17487/RFC4862, September 2007,
            <https://www.rfc-editor.org/info/rfc4862>.
 [RFC4941]  Narten, T., Draves, R., and S. Krishnan, "Privacy
            Extensions for Stateless Address Autoconfiguration in
            IPv6", RFC 4941, DOI 10.17487/RFC4941, September 2007,
            <https://www.rfc-editor.org/info/rfc4941>.
 [RFC5246]  Dierks, T. and E. Rescorla, "The Transport Layer Security
            (TLS) Protocol Version 1.2", RFC 5246,
            DOI 10.17487/RFC5246, August 2008,
            <https://www.rfc-editor.org/info/rfc5246>.
 [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>.

Bjorklund Standards Track [Page 29] RFC 8344 YANG IP Management March 2018

 [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>.
 [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>.
 [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in
            RFC 2119 Key Words", BCP 14, RFC 8174,
            DOI 10.17487/RFC8174, May 2017,
            <https://www.rfc-editor.org/info/rfc8174>.
 [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>.
 [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>.
 [RFC8342]  Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K.,
            and R. Wilton, "Network Management Datastore Architecture
            (NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018,
            <https://www.rfc-editor.org/info/rfc8342>.
 [RFC8343]  Bjorklund, M., "A YANG Data Model for Interface
            Management", RFC 8343, DOI 10.17487/RFC8343, March 2018,
            <https://www.rfc-editor.org/info/rfc8343>.
 [W3C.REC-xml-20081126]
            Bray, T., Paoli, J., Sperberg-McQueen, M., Maler, E., and
            F. Yergeau, "Extensible Markup Language (XML) 1.0
            (Fifth Edition)", World Wide Web Consortium Recommendation
            REC-xml-20081126, November 2008,
            <https://www.w3.org/TR/2008/REC-xml-20081126>.

Bjorklund Standards Track [Page 30] RFC 8344 YANG IP Management March 2018

7.2. Informative References

 [RFC826]   Plummer, D., "An Ethernet Address Resolution Protocol: Or
            Converting Network Protocol Addresses to 48.bit Ethernet
            Address for Transmission on Ethernet Hardware", STD 37,
            RFC 826, DOI 10.17487/RFC0826, November 1982,
            <https://www.rfc-editor.org/info/rfc826>.
 [RFC4293]  Routhier, S., Ed., "Management Information Base for the
            Internet Protocol (IP)", RFC 4293, DOI 10.17487/RFC4293,
            April 2006, <https://www.rfc-editor.org/info/rfc4293>.
 [RFC7217]  Gont, F., "A Method for Generating Semantically Opaque
            Interface Identifiers with IPv6 Stateless Address
            Autoconfiguration (SLAAC)", RFC 7217,
            DOI 10.17487/RFC7217, April 2014,
            <https://www.rfc-editor.org/info/rfc7217>.
 [RFC8022]  Lhotka, L. and A. Lindem, "A YANG Data Model for Routing
            Management", RFC 8022, DOI 10.17487/RFC8022,
            November 2016, <https://www.rfc-editor.org/info/rfc8022>.
 [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>.

Bjorklund Standards Track [Page 31] RFC 8344 YANG IP Management March 2018

Appendix A. Example: NETCONF <get-config> Reply

 This section gives an example of a reply to the NETCONF <get-config>
 request for the running configuration datastore for a device that
 implements the data model defined in this document.
 The XML [W3C.REC-xml-20081126] snippets that follow in this section
 and in Appendix B are provided as examples only.
 <rpc-reply
     xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"
     message-id="101">
   <data>
     <interfaces
         xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces"
         xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">
       <interface>
         <name>eth0</name>
         <type>ianaift:ethernetCsmacd</type>
         <ipv4 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip">
           <address>
             <ip>192.0.2.1</ip>
             <prefix-length>24</prefix-length>
           </address>
         </ipv4>
         <ipv6 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip">
           <mtu>1280</mtu>
           <address>
             <ip>2001:db8::10</ip>
             <prefix-length>32</prefix-length>
           </address>
           <dup-addr-detect-transmits>0</dup-addr-detect-transmits>
         </ipv6>
       </interface>
     </interfaces>
   </data>
 </rpc-reply>

Bjorklund Standards Track [Page 32] RFC 8344 YANG IP Management March 2018

Appendix B. Example: NETCONF <get-data> Reply

 This section gives an example of a reply to the NETCONF <get-data>
 request for the operational state datastore for a device that
 implements the data model defined in this document.
 This example uses the "origin" annotation, which is defined in the
 module "ietf-origin" [RFC8342].
 <rpc-reply
     xmlns="urn:ietf:params:xml:ns:netconf:base:1.0"
     message-id="101">
   <data xmlns="urn:ietf:params:xml:ns:yang:ietf-netconf-datastores">
     <interfaces
         xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces"
         xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type"
         xmlns:or="urn:ietf:params:xml:ns:yang:ietf-origin">
       <interface or:origin="or:intended">
         <name>eth0</name>
         <type>ianaift:ethernetCsmacd</type>
         <!-- other parameters from ietf-interfaces omitted -->
         <ipv4 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip">
           <enabled or:origin="or:default">true</enabled>
           <forwarding or:origin="or:default">false</forwarding>
           <mtu or:origin="or:system">1500</mtu>
           <address>
             <ip>192.0.2.1</ip>
             <prefix-length>24</prefix-length>
             <origin>static</origin>
           </address>
           <neighbor or:origin="or:learned">
             <ip>192.0.2.2</ip>
             <link-layer-address>
               00:00:5E:00:53:AB
             </link-layer-address>
           </neighbor>
         </ipv4>
         <ipv6 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip">
           <enabled or:origin="or:default">true</enabled>
           <forwarding or:origin="or:default">false</forwarding>
           <mtu>1280</mtu>

Bjorklund Standards Track [Page 33] RFC 8344 YANG IP Management March 2018

           <address>
             <ip>2001:db8::10</ip>
             <prefix-length>32</prefix-length>
             <origin>static</origin>
             <status>preferred</status>
           </address>
           <address or:origin="or:learned">
             <ip>2001:db8::1:100</ip>
             <prefix-length>32</prefix-length>
             <origin>dhcp</origin>
             <status>preferred</status>
           </address>
           <dup-addr-detect-transmits>0</dup-addr-detect-transmits>
           <neighbor or:origin="or:learned">
             <ip>2001:db8::1</ip>
             <link-layer-address>
               00:00:5E:00:53:AB
             </link-layer-address>
             <origin>dynamic</origin>
             <is-router/>
             <state>reachable</state>
           </neighbor>
           <neighbor or:origin="or:learned">
             <ip>2001:db8::4</ip>
             <origin>dynamic</origin>
             <state>incomplete</state>
           </neighbor>
         </ipv6>
       </interface>
     </interfaces>
   </data>
 </rpc-reply>

Acknowledgments

 The author wishes to thank Jeffrey Lange, Ladislav Lhotka, Juergen
 Schoenwaelder, and Dave Thaler for their helpful comments.

Author's Address

 Martin Bjorklund
 Tail-f Systems
 Email: mbj@tail-f.com

Bjorklund Standards Track [Page 34]

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