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.";

    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";

    }


    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";

    }

    typedef ip-address-origin {
      type enumeration {
        enum "other" {
          value 0;
          description
            "None of the following.";
        }
        enum "static" {
          value 1;
          description
            "Indicates that the address has been statically
configured -- for example, using the Network Configuration
Protocol (NETCONF) or a command line interface.";
        }
        enum "dhcp" {
          value 2;
          description
            "Indicates an address that has been assigned to this
system by a DHCP server.";
        }
        enum "link-layer" {
          value 3;
          description
            "Indicates an address created by IPv6 stateless
autoconfiguration that embeds a link-layer address in its
interface identifier.";
        }
        enum "random" {
          value 4;
          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" {
          value 0;
          description
            "None of the following.";
        }
        enum "static" {
          value 1;
          description
            "Indicates that the mapping has been statically
configured -- for example, using NETCONF or a command line
interface.";
        }
        enum "dynamic" {
          value 2;
          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.";
    }

    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).";
        }

        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.";
            }
          }  // choice subnet

          leaf origin {
            type ip-address-origin;
            config false;
            description
              "The origin of this address.";
          }
        }  // list 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.";
          }
        }  // list neighbor
      }  // container ipv4

      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";

        }

        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" {
                value 0;
                description
                  "This is a valid address that can appear as the
destination or source address of a packet.";
              }
              enum "deprecated" {
                value 1;
                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" {
                value 2;
                description
                  "This isn't a valid address, and it shouldn't appear
as the destination or source address of a packet.";
              }
              enum "inaccessible" {
                value 3;
                description
                  "The address is not accessible because the interface
to which this address is assigned is not
operational.";
              }
              enum "unknown" {
                value 4;
                description
                  "The status cannot be determined for some reason.";
              }
              enum "tentative" {
                value 5;
                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" {
                value 6;
                description
                  "The address has been determined to be non-unique on
the link and so must not be used.";
              }
              enum "optimistic" {
                value 7;
                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";

          }
        }  // list address

        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.";
          }

          leaf state {
            type enumeration {
              enum "incomplete" {
                value 0;
                description
                  "Address resolution is in progress, and the
link-layer address of the neighbor has not yet been
determined.";
              }
              enum "reachable" {
                value 1;
                description
                  "Roughly speaking, the neighbor is known to have been
reachable recently (within tens of seconds ago).";
              }
              enum "stale" {
                value 2;
                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" {
                value 3;
                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" {
                value 4;
                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";

          }
        }  // list neighbor

        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";

          }

          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";

          }
        }  // container autoconf
      }  // container ipv6
    }

    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.";
          }

          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.";
            case prefix-length {
              status deprecated;
              leaf prefix-length {
                type uint8 {
                  range "0..32";
                }
                status deprecated;
                description
                  "The length of the subnet prefix.";
              }
            }  // case prefix-length

            case netmask {
              status deprecated;
              leaf netmask {
                if-feature ipv4-non-contiguous-netmasks;
                type yang:dotted-quad;
                status deprecated;
                description
                  "The subnet specified as a netmask.";
              }
            }  // case netmask
          }  // choice subnet

          leaf origin {
            type ip-address-origin;
            status deprecated;
            description
              "The origin of this address.";
          }
        }  // list 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.";
          }

          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.";
          }
        }  // list neighbor
      }  // container ipv4

      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";

        }

        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" {
                value 0;
                description
                  "This is a valid address that can appear as the
destination or source address of a packet.";
              }
              enum "deprecated" {
                value 1;
                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" {
                value 2;
                description
                  "This isn't a valid address, and it shouldn't appear
as the destination or source address of a packet.";
              }
              enum "inaccessible" {
                value 3;
                description
                  "The address is not accessible because the interface
to which this address is assigned is not
operational.";
              }
              enum "unknown" {
                value 4;
                description
                  "The status cannot be determined for some reason.";
              }
              enum "tentative" {
                value 5;
                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" {
                value 6;
                description
                  "The address has been determined to be non-unique on
the link and so must not be used.";
              }
              enum "optimistic" {
                value 7;
                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";

          }
        }  // list address

        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" {
                value 0;
                description
                  "Address resolution is in progress, and the
link-layer address of the neighbor has not yet been
determined.";
              }
              enum "reachable" {
                value 1;
                description
                  "Roughly speaking, the neighbor is known to have been
reachable recently (within tens of seconds ago).";
              }
              enum "stale" {
                value 2;
                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" {
                value 3;
                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" {
                value 4;
                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";

          }
        }  // list neighbor
      }  // container ipv6
    }
  }  // module ietf-ip