Internet-Draft udp-client-server-grouping June 2024
Huang Feng, et al. Expires 19 December 2024 [Page]
Workgroup:
Network Working Group
Internet-Draft:
draft-ietf-netconf-udp-client-server-02
Published:
Intended Status:
Standards Track
Expires:
Authors:
A. Huang Feng
INSA-Lyon
P. Francois
INSA-Lyon
K. Watsen
Watsen Networks

YANG Groupings for UDP Clients and UDP Servers

Abstract

This document defines two YANG 1.1 modules to support the configuration of UDP clients and UDP servers.

Requirements Language

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.

Status of This Memo

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

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

Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress."

This Internet-Draft will expire on 19 December 2024.

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Table of Contents

1. Introduction

This document defines two YANG 1.1 [RFC7950] modules to support the configuration of UDP clients and UDP servers [RFC768], either as standalone or in conjunction with configuration of other layers.

2. The "ietf-udp-client" Module

The "ietf-udp-client" YANG module defines the "udp-client-grouping" grouping for configuring UDP clients with remote server information.

2.1. The "udp-client-grouping" Grouping

The following tree diagram [RFC8340] illustrates the tree structure of the "udp-client-grouping" grouping:

module: ietf-udp-client

  grouping udp-client-grouping:
    +-- remote-address    inet:host
    +-- remote-port?      inet:port-number
    +-- local-address?    inet:ip-address {local-binding-supported}?
    +-- local-port?       inet:port-number {local-binding-supported}?

2.2. Example Usage

This section presents an example of usage of the "udp-client-grouping" grouping.

<!-- The outermost element below doesn't exist in the data model. -->
<!--  It simulates if the "grouping" were a "container" instead.  -->

<udp-client xmlns="urn:ietf:params:xml:ns:yang:ietf-udp-client">
  <remote-address>www.example.com</remote-address>
  <remote-port>10000</remote-port>
  <local-address>192.0.2.2</local-address>
  <local-port>12345</local-port>
</udp-client>

2.3. YANG Module

This module imports types defined in [RFC6991].

<CODE BEGINS> file "ietf-udp-client@2024-05-27.yang"

module ietf-udp-client {
  yang-version 1.1;
  namespace
    "urn:ietf:params:xml:ns:yang:ietf-udp-client";
  prefix udpc;
  import ietf-inet-types {
    prefix inet;
    reference
      "RFC 6991: Common YANG Data Types";
  }

  organization "IETF NETCONF (Network Configuration) Working Group";
  contact
    "WG Web:   <http:/tools.ietf.org/wg/netconf/>
     WG List:  <mailto:netconf@ietf.org>

     Authors:  Alex Huang Feng
               <mailto:alex.huang-feng@insa-lyon.fr>
               Pierre Francois
               <mailto:pierre.francois@insa-lyon.fr>";

  description
    "Defines a generic grouping for UDP-based client applications.

    Copyright (c) 2024 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 Revised 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-to-be; see the RFC
    itself for full legal notices.";

  revision 2024-05-27 {
    description
      "Initial revision";
    reference
      "RFC-to-be: YANG Grouping for UDP Clients and UDP Servers";
  }

  feature local-binding-supported {
    description
      "Indicates that the UDP server supports configuring local
       bindings (i.e., the local address and local port) for
       UDP clients.";
  }

  grouping udp-client-grouping {
    description
      "A reusable grouping for configuring a UDP client.

      Note that this grouping uses fairly typical descendant
      node names such that a stack of 'uses' statements will
      have name conflicts.  It is intended that the consuming
      data model will resolve the issue (e.g., by wrapping
      the 'uses' statement in a container called
      'udp-client-parameters').  This model purposely does
      not do this itself so as to provide maximum flexibility
      to consuming models.";

    leaf remote-address {
      type inet:host;
      mandatory true;
      description
        "The IP address or hostname of the remote UDP server.
        If a domain name is configured, then the DNS resolution should
        happen on each connection attempt. If the DNS resolution
        results in multiple IP addresses, the IP addresses
        are tried according to local preference order until
        a connection has been established or until all IP
        addresses have failed.";
    }

    leaf remote-port {
      type inet:port-number;
      default "0";
      description
        "The port number of the remote UDP server. An invalid default
        value is used so that importing modules may 'refine' it with
        the appropriate default port number value.";
    }

    leaf local-address {
      if-feature "local-binding-supported";
      type inet:ip-address;
      description
        "The local IP address/interface to bind to when sending UDP
        messages to the remote server. INADDR_ANY ('0.0.0.0') or
        INADDR6_ANY ('0:0:0:0:0:0:0:0' a.k.a. '::') MAY be used to
        explicitly indicate the implicit default, that the server
        can bind to any IPv4 or IPv6 address.";
    }

    leaf local-port {
      if-feature "local-binding-supported";
      type inet:port-number;
      default "0";
      description
        "The local IP port number to bind to when sending UDP
        messages to the remote server. The port number '0',
        which is the default value, indicates that any available
        local port number may be used.";
    }
  }
}

<CODE ENDS>

3. The "ietf-udp-server" Module

The "ietf-udp-server" YANG module defines the "udp-server-grouping" grouping for configuring UDP servers.

3.1. The "udp-server-grouping" Grouping

The following tree diagram [RFC8340] illustrates the structure of "udp-server-grouping" grouping:

module: ietf-udp-server

  grouping udp-server-grouping:
    +-- local-bind* [local-address]
       +-- local-address    inet:ip-address
       +-- local-port?      inet:port-number

3.2. Example Usage

This section presents two examples of usage of the "udp-server-grouping" grouping. This example shows an example of a server configured for listening to a IPv4 address:

<!-- The outermost element below doesn't exist in the data model. -->
<!--  It simulates if the "grouping" were a "container" instead.  -->

<udp-server xmlns="urn:ietf:params:xml:ns:yang:ietf-udp-server">
  <local-bind>
    <local-address>192.0.2.2</local-address>
    <local-port>49152</local-port>
  </local-bind>
</udp-server>

This example shows an example of a server configured to listen to an IPv4 and IPv6 together:

<!-- The outermost element below doesn't exist in the data model. -->
<!--  It simulates if the "grouping" were a "container" instead.  -->

<udp-server xmlns="urn:ietf:params:xml:ns:yang:ietf-udp-server">
  <local-bind>
    <local-address>192.0.2.2</local-address>
    <local-port>49152</local-port>
  </local-bind>
  <local-bind>
    <local-address>2001:DB8::0</local-address>
    <local-port>49153</local-port>
  </local-bind>
</udp-server>

3.3. YANG Module

The "ietf-udp-server" imports types defined in [RFC6991].

<CODE BEGINS> file "ietf-udp-server@2024-05-27.yang"

module ietf-udp-server {
  yang-version 1.1;
  namespace
    "urn:ietf:params:xml:ns:yang:ietf-udp-server";
  prefix udps;
  import ietf-inet-types {
    prefix inet;
    reference
      "RFC 6991: Common YANG Data Types";
  }

  organization "IETF NETCONF (Network Configuration) Working Group";
  contact
    "WG Web:   <http:/tools.ietf.org/wg/netconf/>
     WG List:  <mailto:netconf@ietf.org>

     Authors:  Alex Huang Feng
               <mailto:alex.huang-feng@insa-lyon.fr>
               Pierre Francois
               <mailto:pierre.francois@insa-lyon.fr>";

  description
    "Defines a generic grouping for UDP-based server applications.

    Copyright (c) 2024 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 Revised 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-to-be; see the RFC
    itself for full legal notices.";

  revision 2024-05-27 {
    description
      "Initial revision";
    reference
      "RFC-to-be: YANG Grouping for UDP Clients and UDP Servers";
  }

  grouping udp-server-grouping {
    description
      "Provides a reusable grouping for configuring a UDP server.

      Note that this grouping uses fairly typical descendant
      node names such that a stack of 'uses' statements will
      have name conflicts.  It is intended that the consuming
      data model will resolve the issue (e.g., by wrapping
      the 'uses' statement in a container called
      'udp-server-parameters').  This model purposely does
      not do this itself so as to provide maximum flexibility
      to consuming models.";

    list local-bind {
      key local-address;
      min-elements 1;
      description
        "A list of bind (listen) points for this server
        instance.  A server instance may have multiple
        bind points to support, e.g., the same port in
        different address families or different ports
        in the same address family.";

      leaf local-address {
        type inet:ip-address;
        mandatory true;
        description
          "The local IP address to listen on for incoming
          UDP messages.  To configure listening
          on all IPv4 addresses the value must be '0.0.0.0'
          (INADDR_ANY).  To configure listening on all IPv6
          addresses the value must be '::' (INADDR6_ANY).";
      }

      leaf local-port {
        type inet:port-number;
        default "0";
        description
          "The local port number to listen on for incoming UDP
          messages.  An invalid default value (0)
          is used (instead of 'mandatory true') so that an
          application level data model may 'refine' it with
          an application specific default port number value.";
      }
    }
  }
}

<CODE ENDS>

4. 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 [RFC8446].

The Network Configuration Access Control Model (NACM) [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.

Since the module in this document only define groupings, these considerations are primarily for the designers of other modules that use these groupings.

None of the readable data nodes defined in this YANG module are considered sensitive or vulnerable in network environments. The NACM "default-deny-all" extension has not been set for any data nodes defined in this module.

None of the writable data nodes defined in this YANG module are considered sensitive or vulnerable in network environments. The NACM "default-deny-write" extension has not been set for any data nodes defined in this module.

This module does not define any RPCs, actions, or notifications, and thus the security consideration for such is not provided here.

5. IANA Considerations

This document describes the URIs from IETF XML Registry and the registration of a two new YANG module names

5.1. URI

IANA is requested to assign two new URI from the IETF XML Registry [RFC3688]. The following two URIs are suggested:

URI: urn:ietf:params:xml:ns:yang:ietf-udp-client
Registrant Contact: The IESG.
XML: N/A; the requested URI is an XML namespace.
URI: urn:ietf:params:xml:ns:yang:ietf-udp-server
Registrant Contact: The IESG.
XML: N/A; the requested URI is an XML namespace.

5.2. YANG module name

This document also requests two new YANG module names in the YANG Module Names registry [RFC8342] with the following suggestions:

name: ietf-udp-client
namespace: urn:ietf:params:xml:ns:yang:ietf-udp-client
prefix: udpc
maintained by IANA? N
reference: RFC-to-be
name: ietf-udp-server
namespace: urn:ietf:params:xml:ns:yang:ietf-udp-server
prefix: udps
maintained by IANA? N
reference: RFC-to-be

6. Acknowledgements

The authors would like to thank Mohamed Boucadair, Benoit Claise, Qiufang Ma and Qin Wu for their review and valuable comments.

7. References

7.1. Normative References

[RFC2119]
Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, , <https://www.rfc-editor.org/info/rfc2119>.
[RFC3688]
Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, , <https://www.rfc-editor.org/info/rfc3688>.
[RFC6241]
Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed., and A. Bierman, Ed., "Network Configuration Protocol (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, , <https://www.rfc-editor.org/info/rfc6241>.
[RFC6242]
Wasserman, M., "Using the NETCONF Protocol over Secure Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, , <https://www.rfc-editor.org/info/rfc6242>.
[RFC6991]
Schoenwaelder, J., Ed., "Common YANG Data Types", RFC 6991, DOI 10.17487/RFC6991, , <https://www.rfc-editor.org/info/rfc6991>.
[RFC768]
Postel, J., "User Datagram Protocol", STD 6, RFC 768, DOI 10.17487/RFC0768, , <https://www.rfc-editor.org/info/rfc768>.
[RFC7950]
Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language", RFC 7950, DOI 10.17487/RFC7950, , <https://www.rfc-editor.org/info/rfc7950>.
[RFC8040]
Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF Protocol", RFC 8040, DOI 10.17487/RFC8040, , <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, , <https://www.rfc-editor.org/info/rfc8174>.
[RFC8340]
Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams", BCP 215, RFC 8340, DOI 10.17487/RFC8340, , <https://www.rfc-editor.org/info/rfc8340>.
[RFC8341]
Bierman, A. and M. Bjorklund, "Network Configuration Access Control Model", STD 91, RFC 8341, DOI 10.17487/RFC8341, , <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, , <https://www.rfc-editor.org/info/rfc8342>.
[RFC8446]
Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.3", RFC 8446, DOI 10.17487/RFC8446, , <https://www.rfc-editor.org/info/rfc8446>.

7.2. Informative References

Authors' Addresses

Alex Huang Feng
INSA-Lyon
Lyon
France
Pierre Francois
INSA-Lyon
Lyon
France
Kent Watsen
Watsen Networks