ETSI GS NFV-SOL 013 V3.4.1 (2021-01)

Network Functions Virtualisation (NFV) Release 3; Protocols and Data Models; Specification of common aspects for RESTful NFV MANO APIs

RGS/NFV-SOL013ed341

General Information

• Status: Not Published
• Technical Committee: NFV SOL - Solutions
• Current Stage: 12 - Completion
• Due Date: 01-Feb-2021
• Completion Date: 05-Jan-2021

Standards Content (Sample)

ETSI GS NFV-SOL 013 V3.4.1 (2021-01)






GROUP SPECIFICATION
Network Functions Virtualisation (NFV) Release 3;
Protocols and Data Models;
Specification of common aspects for RESTful NFV MANO APIs
Disclaimer
The present document has been produced and approved by the Network Functions Virtualisation (NFV) ETSI Industry
Specification Group (ISG) and represents the views of those members who participated in this ISG.
It does not necessarily represent the views of the entire ETSI membership.

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2 ETSI GS NFV-SOL 013 V3.4.1 (2021-01)
Reference
RGS/NFV-SOL013ed341
Keywords
API, NFV, protocol
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3 ETSI GS NFV-SOL 013 V3.4.1 (2021-01)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 5
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 7
3 Definition of terms, symbols and abbreviations . 8
3.1 Terms . 8
3.2 Symbols . 8
3.3 Abbreviations . 8
4 HTTP usage . 9
4.1 URI structure and supported content formats . 9
4.2 Usage of HTTP header fields . 10
4.2.1 Introduction. 10
4.2.2 Request header fields . 10
4.2.3 Response header fields . 10
5 Result set control . 11
5.1 Introduction . 11
5.2 Attribute-based filtering . 11
5.2.1 Overview and example (informative) . 11
5.2.2 Specification . 12
5.3 Attribute selectors. 14
5.3.1 Overview and example (informative) . 14
5.3.2 Specification . 14
5.3.2.1 GET request . 14
5.3.2.2 GET response . 15
5.4 Handling of large query results . 16
5.4.1 Overview . 16
5.4.2 Specification . 16
5.4.2.1 Alternatives . 16
5.4.2.2 Error response . 17
5.4.2.3 Paged response . 17
6 Error reporting . 17
6.1 Introduction . 17
6.2 General mechanism . 17
6.3 Type: ProblemDetails . 17
6.4 Common error situations . 18
7 Common data types . 20
7.1 Structured data types . 20
7.1.1 Introduction. 20
7.1.2 Type: Object . 20
7.1.3 Type: Link . 20
7.1.4 Type: NotificationLink . 20
7.1.5 Type: KeyValuePairs . 21
7.1.6 Type: ApiVersionInformation . 21
7.1.7 Type: Checksum . 21
7.2 Simple data types and enumerations . 22
7.2.1 Introduction. 22
7.2.2 Simple data types . 22
7.2.3 Enumerations . 22
8 Authorization of API requests and notifications . 22
ETSI

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4 ETSI GS NFV-SOL 013 V3.4.1 (2021-01)
8.1 Introduction . 22
8.2 Flows (informative) . 23
8.2.1 General . 23
8.2.2 Authorization of API requests using OAuth 2.0 access tokens . 23
8.2.3 Authorization of API requests using TLS certificates . 25
8.2.4 Authorization of notifications using the HTTP Basic authentication scheme . 26
8.2.5 Authorization of notifications using OAuth 2.0 access tokens . 27
8.2.6 Authorization of notifications using TLS certificates . 29
8.3 Specification . 31
8.3.1 Introduction. 31
8.3.2 General mechanism. 31
8.3.3 Authorizing API requests . 31
8.3.4 Authorizing the sending of notifications . 32
8.3.5 Client roles . 33
8.3.6 Negotiation of the authorization method . 34
8.3.6.1 Authorization of API requests . 34
8.3.6.2 Authorization of notification requests . 36
9 Version management . 37
9.1 Version identifiers and parameters . 37
9.1.1 Version identifiers . 37
9.1.2 Version parameters . 37
9.2 Rules for incrementing version identifier fields . 37
9.2.1 General . 37
9.2.2 Examples of backward and non-backward compatible changes . 38
9.3 Version information retrieval . 39
9.3.1 General . 39
9.3.2 Resource structure and methods . 39
9.3.3 Resource: API versions . 40
9.3.3.1 Description . 40
9.3.3.2 Resource definition . 40
9.3.3.3 Resource methods . 40
9.3.3.3.1 POST . 40
9.3.3.3.2 GET . 40
9.3.3.3.3 PUT . 41
9.3.3.3.4 PATCH . 41
9.3.3.3.5 DELETE . 41
9.4 Version signalling. 41
Annex A (informative): Change History . 42
History . 43

ETSI

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5 ETSI GS NFV-SOL 013 V3.4.1 (2021-01)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This Group Specification (GS) has been produced by ETSI Industry Specification Group (ISG) Network Functions
Virtualisation (NFV).
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI

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6 ETSI GS NFV-SOL 013 V3.4.1 (2021-01)
1 Scope
The present document specifies common aspects of RESTful protocols and data models for ETSI NFV management
and orchestration (MANO) interfaces.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] Void.
[2] IETF RFC 3339: "Date and Time on the Internet: Timestamps".
NOTE: Available at https://tools.ietf.org/html/rfc3339.
[3] IETF RFC 3986: "Uniform Resource Identifier (URI): Generic Syntax".
NOTE: Available at https://tools.ietf.org/html/rfc3986.
[4] IETF RFC 4918: "HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV)".
NOTE: Available at https://tools.ietf.org/html/rfc4918.
[5] IETF RFC 5246: "The Transport Layer Security (TLS) Protocol Version 1.2".
NOTE: Available at https://tools.ietf.org/html/rfc5246.
[6] IETF RFC 6585: "Additional HTTP Status Codes".
NOTE: Available at https://tools.ietf.org/html/rfc6585.
[7] IETF RFC 6749: "The OAuth 2.0 Authorization Framework".
NOTE: Available from https://tools.ietf.org/html/rfc6749.
[8] IETF RFC 6750: "The OAuth 2.0 Authorization Framework: Bearer Token Usage".
NOTE: Available from https://tools.ietf.org/html/rfc6750.
[9] IETF RFC 8259: "The JavaScript Object Notation (JSON) Data Interchange Format".
NOTE: Available at https://tools.ietf.org/html/rfc8259.
[10] IETF RFC 7231: "Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content".
NOTE: Available at https://tools.ietf.org/html/rfc7231.
[11] IETF RFC 7232: "Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests".
NOTE: Available at https://tools.ietf.org/html/rfc7232.
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7 ETSI GS NFV-SOL 013 V3.4.1 (2021-01)
[12] IETF RFC 7233: "Hypertext Transfer Protocol (HTTP/1.1): Range Requests".
NOTE: Available at https://tools.ietf.org/html/rfc7233.
[13] IETF RFC 7235: "Hypertext Transfer Protocol (HTTP/1.1): Authentication".
NOTE: Available at https://tools.ietf.org/html/rfc7235.
[14] IETF RFC 7617: "The 'Basic' HTTP Authentication Scheme".
NOTE: Available from https://tools.ietf.org/html/rfc7617.
[15] IETF RFC 7807: "Problem Details for HTTP APIs".
NOTE: Available at https://tools.ietf.org/html/rfc7807.
[16] IETF RFC 6901: "JavaScript Object Notation (JSON) Pointer".
NOTE: Available at https://tools.ietf.org/html/rfc6901.
[17] IETF RFC 8288: "Web Linking".
NOTE: Available at https://tools.ietf.org/html/rfc8288.
[18] Semantic Versioning 2.0.0.
NOTE: Available at https://semver.org/.
[19] IETF RFC 4229: "HTTP Header Field Registrations".
NOTE: Available at https://tools.ietf.org/html/rfc4229.
[20] ETSI GS NFV-SEC 022: "Network Functions Virtualisation (NFV) Release 2; Security; Access
Token Specification for API Access".
[21] ETSI TS 133 210: "Digital cellular telecommunications system (Phase 2+) (GSM); Universal
Mobile Telecommunications System (UMTS); LTE; 5G; Network Domain Security (NDS); IP
network layer security (3GPP TS 33.210)".
[22] IETF RFC 8446: "The Transport Layer Security (TLS) Protocol Version 1.3".
NOTE: Available at https://tools.ietf.org/html/rfc8446.
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI GS NFV 003: "Network Functions Virtualisation (NFV); Terminology for Main Concepts in
NFV".
[i.2] Void.
[i.3] IANA: "Hypertext Transfer Protocol (HTTP) Status Code Registry".
NOTE: Available at http://www.iana.org/assignments/http-status-codes.
[i.4] ETSI NFV OpenAPI repository.
NOTE: Available at https://forge.etsi.org/rep/nfv/.
ETSI

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[i.5] JSON Schema Validation: A Vocabulary for Structural Validation of JSON, Version draft-07,
November 19, 2017.
NOTE 1: JSON schema is documented at http://json-schema.org/.
NOTE 2: The specification is available as Internet Draft at https://tools.ietf.org/html/draft-handrews-json-schema-
validation-01.
[i.6] OpenAPI™ Specification.
NOTE 1: Available at https://github.com/OAI/OpenAPI-Specification.
NOTE 2: OpenAPI Specification and OpenAPI Initiative and their respective logos, are trademarks of the Linux
Foundation.
[i.7] IANA registry for Hash Function Textual Names.
NOTE: Available at https://www.iana.org/assignments/hash-function-text-names/hash-function-text-
names.xhtml.
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the terms given in ETSI GS NFV 003 [i.1] apply.
3.2 Symbols
Void.
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
API Application Programming Interface
EM Element Manager
ETSI European Telecommunications Standards Institute
GMT Greenwich Mean Time
GS Group Specification
HATEOAS Hypermedia As The Engine Of Application State
HTML HyperText Markup Language
HTTP HyperText Transfer Protocol
HTTPS HTTP Secure
IANA Internet Assigned Numbers Authority
IETF Internet Engineering Task Force
JSON JavaScript Object Notation
MAC Medium Access Control
MANO Management and Orchestration
MIME Multipurpose Internet Mail Extensions
NFV Network Functions Virtualisation
NFVO NFV Orchestrator
REST REpresentational State Transfer
RFC Request For Comments
TLS Transport Layer Security
URI Uniform Resource Identifier
VIM Virtualised Infrastructure Manager
VNF Virtualised Network Function
VNFM VNF Manager
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9 ETSI GS NFV-SOL 013 V3.4.1 (2021-01)
4 HTTP usage
4.1 URI structure and supported content formats
This clause specifies the URI prefix and the supported formats applicable to the RESTful NFV-MANO APIs.
All resource URIs of the APIs shall have the following prefix, except the "API versions" resource which shall follow
the rules specified in clause 9.3:
{apiRoot}/{apiName}/{apiMajorVersion}/
where:
{apiRoot} indicates the scheme ("https"), the host name and optional port, and an optional
sequence of path segments that together represent a prefix path.
EXAMPLE: http://orchestrator.example.com/nfv_apis/abc
{apiName} indicates the interface name in an abbreviated form. The {apiName} of each interface
is defined in the clause specifying the corresponding interface.
{apiMajorVersion} indicates the current major version (see clause 9.1) of the API and is defined in the
clause specifying the corresponding interface.
For HTTP requests and responses that have a body, the content format JSON (see IETF RFC 8259 [9]) shall be
supported. The JSON format shall be signalled by the content type "application/json".
HTTP shall be run as an application protocol over TLS, a combination that is known as HTTPS. All APIs shall use TLS
version 1.2 as defined by IETF RFC 5246 [5] or later. Versions of TLS earlier than 1.2 shall neither be supported nor
used.
NOTE 1: The HTTP protocol elements mentioned in the RESTful NFV-MANO API specifications originate from
the HTTP specification; HTTPS runs the HTTP protocol on top of a TLS layer. The RESTful
NFV-MANO specifications therefore use the statement above to mention "HTTP request", "HTTP
header", etc., without explicitly calling out whether or not these are run over TLS.
TLS implementations shall meet or exceed the security algorithm, key length and strength requirements specified in
clause 6.2.3 (if TLS version 1.2 as defined by IETF RFC 5246 [5] is used) or clause 6.2.2 (if TLS version 1.3 as defined
by IETF RFC 8446 [22] is used) of ETSI TS 133 210 [21] (3GPP Release 16 or later).
All resource URIs of the API shall comply with the URI syntax as defined in IETF RFC 3986 [3]. An implementation
that dynamically generates resource URI parts (individual path segments, sequences of path segments that are separated
by "/", query parameter values) shall ensure that these parts only use the character set that is allowed by IETF
RFC 3986 [3] for these parts.
NOTE 2: This means that characters not part of this allowed set are escaped using percent-encoding as defined by
IETF RFC 3986 [3].
Unless otherwise specified explicitly, all request URI parameters that are part of the path of the resource URI shall be
individual path segments, i.e. shall not contain the "/" character.
NOTE 3: A request URI parameter is denoted by a string in curly brackets, e.g. {subscriptionId}.
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10 ETSI GS NFV-SOL 013 V3.4.1 (2021-01)
4.2 Usage of HTTP header fields
4.2.1 Introduction
HTTP headers are components of the header section of the HTTP request and response messages. They contain the
information about the server/client and metadata of the transaction. The use of HTTP header fields shall comply with
the provisions defined for those header fields in the specifications referenced from tables 4.2.2-1 and 4.2.3-1. The
following clauses describe more details related to selected HTTP header fields.
4.2.2 Request header fields
This clause describes the usage of selected HTTP header fields of the request messages in the RESTful NFV-MANO
APIs. The HTTP header fields used in the request messages are specified in table 4.2.2-1.
Table 4.2.2-1: Heade
...