module ietf-netconf-monitoring {

  namespace "urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring";

  prefix "ncm";

  import ietf-yang-types { prefix yang; }

  import ietf-inet-types { prefix inet; }

  organization

    "IETF NETCONF (Network Configuration) Working Group";

  contact

    "WG Web:   <http://tools.ietf.org/wg/netconf/>

     WG List:  <mailto:netconf@ietf.org>

     WG Chair: Mehmet Ersue

               <mailto:mehmet.ersue@nsn.com>

     WG Chair: Bert Wijnen

               <mailto:bertietf@bwijnen.net>

     Editor:   Mark Scott

               <mailto:mark.scott@ericsson.com>

     Editor:   Martin Bjorklund

               <mailto:mbj@tail-f.com>";

  description

    "NETCONF Monitoring Module.

     All elements in this module are read-only.

     Copyright (c) 2010 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

     (http://trustee.ietf.org/license-info).

     This version of this YANG module is part of RFC 6022; see

     the RFC itself for full legal notices.";

  revision 2010-10-04 {

    description

      "Initial revision.";

    reference

      "RFC 6022: YANG Module for NETCONF Monitoring";

  }

  typedef netconf-datastore-type {

    type enumeration {

      enum running;

      enum candidate;

      enum startup;

    }

    description

      "Enumeration of possible NETCONF datastore types.";

    reference

      "RFC 4741: NETCONF Configuration Protocol";

  }

  identity transport {

    description

      "Base identity for NETCONF transport types.";

  }

  identity netconf-ssh {

    base transport;

    description

      "NETCONF over Secure Shell (SSH).";

    reference

      "RFC 4742: Using the NETCONF Configuration Protocol

                 over Secure SHell (SSH)";

  }

  identity netconf-soap-over-beep {

    base transport;

    description

      "NETCONF over Simple Object Access Protocol (SOAP) over

       Blocks Extensible Exchange Protocol (BEEP).";

    reference

      "RFC 4743: Using NETCONF over the Simple Object

                 Access Protocol (SOAP)";

  }

  identity netconf-soap-over-https {

    base transport;

    description

      "NETCONF over Simple Object Access Protocol (SOAP)

      over Hypertext Transfer Protocol Secure (HTTPS).";

    reference

      "RFC 4743: Using NETCONF over the Simple Object

                 Access Protocol (SOAP)";

  }

  identity netconf-beep {

    base transport;

    description

      "NETCONF over Blocks Extensible Exchange Protocol (BEEP).";

    reference

      "RFC 4744: Using the NETCONF Protocol over the

                 Blocks Extensible Exchange Protocol (BEEP)";

  }

  identity netconf-tls {

    base transport;

    description

      "NETCONF over Transport Layer Security (TLS).";

    reference

      "RFC 5539: NETCONF over Transport Layer Security (TLS)";

  }

  identity schema-format {

    description

      "Base identity for data model schema languages.";

  }

  identity xsd {

    base schema-format;

    description

      "W3C XML Schema Definition.";

    reference

      "W3C REC REC-xmlschema-1-20041028:

         XML Schema Part 1: Structures";

  }

  identity yang {

    base schema-format;

    description

      "The YANG data modeling language for NETCONF.";

    reference

      "RFC 6020:  YANG - A Data Modeling Language for the

                  Network Configuration Protocol (NETCONF)";

  }

  identity yin {

    base schema-format;

    description

      "The YIN syntax for YANG.";

    reference

      "RFC 6020:  YANG - A Data Modeling Language for the

                  Network Configuration Protocol (NETCONF)";

  }

  identity rng {

    base schema-format;

    description

      "Regular Language for XML Next Generation (RELAX NG).";

    reference

      "ISO/IEC 19757-2:2008: RELAX NG";

  }

  identity rnc {

    base schema-format;

    description

      "Relax NG Compact Syntax";

    reference

      "ISO/IEC 19757-2:2008: RELAX NG";

  }

  grouping common-counters {

    description

      "Counters that exist both per session, and also globally,

       accumulated from all sessions.";

    leaf in-rpcs {

      type yang:zero-based-counter32;

      description

        "Number of correct <rpc> messages received.";

    }

    leaf in-bad-rpcs {

      type yang:zero-based-counter32;

      description

        "Number of messages received when an <rpc> message was expected,

         that were not correct <rpc> messages.  This includes XML parse

         errors and errors on the rpc layer.";

    }

    leaf out-rpc-errors {

      type yang:zero-based-counter32;

      description

        "Number of <rpc-reply> messages sent that contained an

         <rpc-error> element.";

    }

    leaf out-notifications {

      type yang:zero-based-counter32;

      description

        "Number of <notification> messages sent.";

    }

  }

  container netconf-state {

    config false;

    description

      "The netconf-state container is the root of the monitoring

       data model.";

    container capabilities {

      description

        "Contains the list of NETCONF capabilities supported by the

         server.";

      leaf-list capability {

        type inet:uri;

        description

          "List of NETCONF capabilities supported by the server.";

      }

    }

    container datastores {

      description

        "Contains the list of NETCONF configuration datastores.";

      list datastore {

        key name;

        description

          "List of NETCONF configuration datastores supported by

           the NETCONF server and related information.";

        leaf name {

          type netconf-datastore-type;

          description

            "Name of the datastore associated with this list entry.";

        }

        container locks {

          presence

            "This container is present only if the datastore

             is locked.";

          description

            "The NETCONF <lock> and <partial-lock> operations allow

             a client to lock specific resources in a datastore.  The

             NETCONF server will prevent changes to the locked

             resources by all sessions except the one that acquired

             the lock(s).

             Monitoring information is provided for each datastore

             entry including details such as the session that acquired

             the lock, the type of lock (global or partial) and the

             list of locked resources.  Multiple locks per datastore

             are supported.";

          grouping lock-info {

            description

              "Lock related parameters, common to both global and

               partial locks.";

            leaf locked-by-session {

              type uint32;

              mandatory true;

              description

                "The session ID of the session that has locked

                 this resource.  Both a global lock and a partial

                 lock MUST contain the NETCONF session-id.

                 If the lock is held by a session that is not managed

                 by the NETCONF server (e.g., a CLI session), a session

                 id of 0 (zero) is reported.";

              reference

                "RFC 4741: NETCONF Configuration Protocol";

            }

            leaf locked-time {

              type yang:date-and-time;

              mandatory true;

              description

                "The date and time of when the resource was

                 locked.";

            }

          }

          choice lock-type {

            description

              "Indicates if a global lock or a set of partial locks

               are set.";

            container global-lock {

              description

                "Present if the global lock is set.";

              uses lock-info;

            }

            list partial-lock {

              key lock-id;

              description

                "List of partial locks.";

              reference

                "RFC 5717: Partial Lock Remote Procedure Call (RPC) for

                           NETCONF";

              leaf lock-id {

                type uint32;

                description

                  "This is the lock id returned in the <partial-lock>

                   response.";

              }

              uses lock-info;

              leaf-list select {

                type yang:xpath1.0;

                min-elements 1;

                description

                  "The xpath expression that was used to request

                   the lock.  The select expression indicates the

                   original intended scope of the lock.";

              }

              leaf-list locked-node {

                type instance-identifier;

                description

                  "The list of instance-identifiers (i.e., the

                   locked nodes).

                   The scope of the partial lock is defined by the list

                   of locked nodes.";

              }

            }

          }

        }

      }

    }

    container schemas {

      description

        "Contains the list of data model schemas supported by the

         server.";

      list schema {

        key "identifier version format";

        description

          "List of data model schemas supported by the server.";

        leaf identifier {

          type string;

          description

            "Identifier to uniquely reference the schema.  The

             identifier is used in the <get-schema> operation and may

             be used for other purposes such as file retrieval.

             For modeling languages that support or require a data

             model name (e.g., YANG module name) the identifier MUST

             match that name.  For YANG data models, the identifier is

             the name of the module or submodule.  In other cases, an

             identifier such as a filename MAY be used instead.";

        }

        leaf version {

          type string;

          description

            "Version of the schema supported.  Multiple versions MAY be

             supported simultaneously by a NETCONF server.  Each

             version MUST be reported individually in the schema list,

             i.e., with same identifier, possibly different location,

             but different version.

             For YANG data models, version is the value of the most

             recent YANG 'revision' statement in the module or

             submodule, or the empty string if no 'revision' statement

             is present.";

        }

        leaf format {

          type identityref {

            base schema-format;

          }

          description

            "The data modeling language the schema is written

             in (currently xsd, yang, yin, rng, or rnc).

             For YANG data models, 'yang' format MUST be supported and

             'yin' format MAY also be provided.";

        }

        leaf namespace {

          type inet:uri;

          mandatory true;

          description

            "The XML namespace defined by the data model.

             For YANG data models, this is the module's namespace.

             If the list entry describes a submodule, this field

             contains the namespace of the module to which the

             submodule belongs.";

        }

        leaf-list location {

          type union {

            type enumeration {

              enum "NETCONF";

            }

            type inet:uri;

          }

          description

            "One or more locations from which the schema can be

             retrieved.  This list SHOULD contain at least one

             entry per schema.

             A schema entry may be located on a remote file system

             (e.g., reference to file system for ftp retrieval) or

             retrieved directly from a server supporting the

             <get-schema> operation (denoted by the value 'NETCONF').";

        }

      }

    }

    container sessions {

      description

        "The sessions container includes session-specific data for

         NETCONF management sessions.  The session list MUST include

         all currently active NETCONF sessions.";

      list session {

        key session-id;

        description

          "All NETCONF sessions managed by the NETCONF server

           MUST be reported in this list.";

        leaf session-id {

          type uint32 {

            range "1..max";

          }

          description

            "Unique identifier for the session.  This value is the

             NETCONF session identifier, as defined in RFC 4741.";

          reference

            "RFC 4741: NETCONF Configuration Protocol";

        }

        leaf transport {

          type identityref {

            base transport;

          }

          mandatory true;

          description

            "Identifies the transport for each session, e.g.,

            'netconf-ssh', 'netconf-soap', etc.";

        }

        leaf username  {

          type string;

          mandatory true;

          description

            "The username is the client identity that was authenticated

            by the NETCONF transport protocol.  The algorithm used to

            derive the username is NETCONF transport protocol specific

            and in addition specific to the authentication mechanism

            used by the NETCONF transport protocol.";

        }

        leaf source-host {

          type inet:host;

          description

            "Host identifier of the NETCONF client.  The value

             returned is implementation specific (e.g., hostname,

             IPv4 address, IPv6 address)";

        }

        leaf login-time {

          type yang:date-and-time;

          mandatory true;

          description

            "Time at the server at which the session was established.";

        }

        uses common-counters {

          description

            "Per-session counters.  Zero based with following reset

             behaviour:

               - at start of a session

               - when max value is reached";

        }

      }

    }

    container statistics {

      description

        "Statistical data pertaining to the NETCONF server.";

      leaf netconf-start-time {

        type yang:date-and-time;

        description

          "Date and time at which the management subsystem was

           started.";

      }

      leaf in-bad-hellos {

        type yang:zero-based-counter32;

        description

          "Number of sessions silently dropped because an

          invalid <hello> message was received.  This includes <hello>

          messages with a 'session-id' attribute, bad namespace, and

          bad capability declarations.";

      }

      leaf in-sessions {

        type yang:zero-based-counter32;

        description

          "Number of sessions started.  This counter is incremented

           when a <hello> message with a <session-id> is sent.

          'in-sessions' - 'in-bad-hellos' =

              'number of correctly started netconf sessions'";

      }

      leaf dropped-sessions {

        type yang:zero-based-counter32;

        description

          "Number of sessions that were abnormally terminated, e.g.,

           due to idle timeout or transport close.  This counter is not

           incremented when a session is properly closed by a

           <close-session> operation, or killed by a <kill-session>

           operation.";

      }

      uses common-counters {

        description

          "Global counters, accumulated from all sessions.

           Zero based with following reset behaviour:

             - re-initialization of NETCONF server

             - when max value is reached";

      }

    }

  }

  rpc get-schema {

    description

      "This operation is used to retrieve a schema from the

       NETCONF server.

       Positive Response:

         The NETCONF server returns the requested schema.

       Negative Response:

         If requested schema does not exist, the <error-tag> is

         'invalid-value'.

         If more than one schema matches the requested parameters, the

         <error-tag> is 'operation-failed', and <error-app-tag> is

         'data-not-unique'.";

    input {

      leaf identifier {

        type string;

        mandatory true;

        description

          "Identifier for the schema list entry.";

      }

      leaf version {

        type string;

        description

          "Version of the schema requested.  If this parameter is not

           present, and more than one version of the schema exists on

           the server, a 'data-not-unique' error is returned, as

           described above.";

      }

      leaf format {

        type identityref {

          base schema-format;

        }

        description

           "The data modeling language of the schema.  If this

            parameter is not present, and more than one formats of

            the schema exists on the server, a 'data-not-unique' error

            is returned, as described above.";

      }

    }

    output {

        anyxml data {

          description

            "Contains the schema content.";

      }

    }

  }

}