draft-ietf-core-yang-cbor-02.txt   draft-ietf-core-yang-cbor-03.txt 
Internet Engineering Task Force M. Veillette, Ed. Internet Engineering Task Force M. Veillette, Ed.
Internet-Draft Trilliant Networks Inc. Internet-Draft Trilliant Networks Inc.
Intended status: Standards Track A. Pelov, Ed. Intended status: Standards Track A. Pelov, Ed.
Expires: January 9, 2017 Acklio Expires: May 4, 2017 Acklio
A. Somaraju A. Somaraju
Tridonic GmbH & Co KG Tridonic GmbH & Co KG
R. Turner R. Turner
Landis+Gyr Landis+Gyr
A. Minaburo A. Minaburo
Acklio Acklio
July 08, 2016 October 31, 2016
CBOR Encoding of Data Modeled with YANG CBOR Encoding of Data Modeled with YANG
draft-ietf-core-yang-cbor-02 draft-ietf-core-yang-cbor-03
Abstract Abstract
This document defines encoding rules for serializing configuration This document defines encoding rules for serializing configuration
data, state data, RPC input and RPC output, Action input, Action data, state data, RPC input and RPC output, Action input, Action
output and notifications defined within YANG modules using the output and notifications defined within YANG modules using the
Concise Binary Object Representation (CBOR) [RFC7049]. Concise Binary Object Representation (CBOR) [RFC7049].
Status of This Memo Status of This Memo
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on January 9, 2017. This Internet-Draft will expire on May 4, 2017.
Copyright Notice Copyright Notice
Copyright (c) 2016 IETF Trust and the persons identified as the Copyright (c) 2016 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 26 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 26
7.1. Tags Registry . . . . . . . . . . . . . . . . . . . . . . 26 7.1. Tags Registry . . . . . . . . . . . . . . . . . . . . . . 26
8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 26 8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 26
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 27 9. References . . . . . . . . . . . . . . . . . . . . . . . . . 27
9.1. Normative References . . . . . . . . . . . . . . . . . . 27 9.1. Normative References . . . . . . . . . . . . . . . . . . 27
9.2. Informative References . . . . . . . . . . . . . . . . . 27 9.2. Informative References . . . . . . . . . . . . . . . . . 27
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 28 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 28
1. Introduction 1. Introduction
The specification of the YANG 1.1 data modelling language The specification of the YANG 1.1 data modelling language [RFC7950]
[I-D.ietf-netmod-rfc6020bis] defines an XML encoding for data defines an XML encoding for data instances, i.e. contents of
instances, i.e. contents of configuration datastores, state data, RPC configuration datastores, state data, RPC inputs and outputs, action
inputs and outputs, action inputs and outputs, and event inputs and outputs, and event notifications.
notifications.
A new set of encoding rules has been defined to allow the use of the A new set of encoding rules has been defined to allow the use of the
same data models in environments based on the JavaScript Object same data models in environments based on the JavaScript Object
Notation (JSON) Data Interchange Format [RFC7159]. This is Notation (JSON) Data Interchange Format [RFC7159]. This is
accomplished in the JSON Encoding of Data Modeled with YANG accomplished in the JSON Encoding of Data Modeled with YANG
specification [I-D.ietf-netmod-yang-json]. specification [RFC7951].
The aim of this document is to define a set of encoding rules for the The aim of this document is to define a set of encoding rules for the
Concise Binary Object Representation (CBOR) [RFC7049]. The resulting Concise Binary Object Representation (CBOR) [RFC7049]. The resulting
encoding is more compact compared to XML and JSON and more suitable encoding is more compact compared to XML and JSON and more suitable
for Constrained Nodes and/or Constrained Networks as defined by for Constrained Nodes and/or Constrained Networks as defined by
[RFC7228]. [RFC7228].
2. Terminology and Notation 2. Terminology and Notation
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119]. document are to be interpreted as described in [RFC2119].
The following terms are defined in [I-D.ietf-netmod-rfc6020bis]: The following terms are defined in [RFC7950]:
o action o action
o anydata o anydata
o anyxml o anyxml
o data node o data node
o data tree o data tree
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o notification o notification
o RPC o RPC
o schema node o schema node
o schema tree o schema tree
o submodule o submodule
The following terms are defined in [I-D.ietf-netmod-yang-json]: The following terms are defined in [RFC7951]:
o member name o member name
o name of an identity o name of an identity
o namespace-qualified o namespace-qualified
This specification also makes use of the following terminology: This specification also makes use of the following terminology:
o child: A schema node defined within a collection such as a o child: A schema node defined within a collection such as a
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Basic schema nodes such as leaf, leaf-list, list, anydata and anyxml Basic schema nodes such as leaf, leaf-list, list, anydata and anyxml
can be encoded standalone. In this case, only the value of this can be encoded standalone. In this case, only the value of this
schema node is encoded in CBOR. Identification of this value needs schema node is encoded in CBOR. Identification of this value needs
to be provided by some external means when required. to be provided by some external means when required.
A collection such as container, list instance, notification, RPC A collection such as container, list instance, notification, RPC
input, RPC output, action input and action output is serialized using input, RPC output, action input and action output is serialized using
a CBOR map in which each child schema node is encoded using a key and a CBOR map in which each child schema node is encoded using a key and
a value. This specification supports two type of keys; SID as a value. This specification supports two type of keys; SID as
defined in [I-D.somaraju-core-sid] and member names as defined in defined in [I-D.ietf-core-sid] and member names as defined in
[I-D.ietf-netmod-yang-json]. Each of these key type is encoded using [RFC7951]. Each of these key type is encoded using a specific CBOR
a specific CBOR type which allows their interpretation during the type which allows their interpretation during the deserialization
deserialization process. The end user of this mapping specification process. The end user of this mapping specification (e.g. RESFCONF,
can mandate the use of a specific key type or a specific subset of CoMI) can mandate the use of a specific key type.
key types.
In order to minimize the size of the encoded data, the proposed In order to minimize the size of the encoded data, the proposed
mapping avoid any unnecessary meta-information beyond those natively mapping avoid any unnecessary meta-information beyond those natively
supported by CBOR. For instance, CBOR tags are used sorely in the supported by CBOR. For instance, CBOR tags are used solely in the
case of the union datatype to distinguish explicitly the use of case of the union datatype to distinguish explicitly the use of
different YANG datatypes encoded using the same CBOR major type. different YANG datatypes encoded using the same CBOR major type.
It is expected that application entities generating and decoding CBOR It is expected that application entities generating and decoding CBOR
contents have enough knowledge about the information processed in contents have enough knowledge about the information processed in
order to perform the expected task without the need of such extra order to perform the expected task without the need of such extra
meta-information. meta-information.
4. Encoding of YANG Data Node Instances 4. Encoding of YANG Data Node Instances
Schema node instances defined using the YANG modeling language are Schema node instances defined using the YANG modeling language are
encoded using CBOR [RFC7049] based on the rules defined in this encoded using CBOR [RFC7049] based on the rules defined in this
section. We assume that the reader is already familiar with both section. We assume that the reader is already familiar with both
YANG [I-D.ietf-netmod-rfc6020bis] and CBOR [RFC7049]. YANG [RFC7950] and CBOR [RFC7049].
4.1. The 'leaf' Data Node 4.1. The 'leaf' Data Node
Leafs MUST be encoded based on the encoding rules specified in Leafs MUST be encoded based on the encoding rules specified in
Section 5. Section 5.
4.2. The 'container' Data Node 4.2. The 'container' Data Node
Collections such as containers, list instances, notifications, RPC Collections such as containers, list instances, notifications, RPC
inputs, RPC outputs, action inputs and action outputs MUST be encoded inputs, RPC outputs, action inputs and action outputs MUST be encoded
using a CBOR map data item (major type 5). A map is comprised of using a CBOR map data item (major type 5). A map is comprised of
pairs of data items, with each data item consisting of a key and a pairs of data items, with each data item consisting of a key and a
value. Each key within the CBOR map is set to a data node value. Each key within the CBOR map is set to a data node
identifier, each value is set to the value of this data node identifier, each value is set to the value of this data node
instance. instance.
This specification supports two type of keys; SID as defined in This specification supports two type of keys; SID as defined in
[I-D.somaraju-core-sid] encoded using CBOR unsigned or signed [I-D.ietf-core-sid] encoded using CBOR unsigned or signed integers
integers and member names as defined in [I-D.ietf-netmod-yang-json] and member names as defined in [RFC7951] encoded using CBOR text
encoded using CBOR text strings. The use of CBOR byte strings for strings. The use of CBOR byte strings for keys is reserved for
keys is reserved for future extensions. future extensions.
4.2.1. SIDs as keys 4.2.1. SIDs as keys
Keys implemented using SIDs MUST be encoded using a CBOR unsigned Keys implemented using SIDs MUST be encoded using a CBOR unsigned
integer (major type 0) or CBOR signed integer (major type 1), integer (major type 0) or CBOR signed integer (major type 1),
depending on the actual value. Keys are set to the delta of the depending on the actual value. Keys are set to the delta of the
associated SID, delta values are computed as follows: associated SID, delta values are computed as follows:
o The delta value is equal to the SID of the current schema node o The delta value is equal to the SID of the current schema node
minus the SID of the parent schema node. When no parent exists in minus the SID of the parent schema node. When no parent exists in
the context of use of this container, the delta is set to the SID the context of use of this container, the delta is set to the SID
of the current schema node (a parent with SID equal to zero is of the current schema node (a parent with SID equal to zero is
assumed). assumed).
o Delta values may result in a negative number, clients and servers o Delta values may result in a negative number, clients and servers
MUST support negative deltas. MUST support negative deltas.
The following example shows the encoding of the 'system' container The following example shows the encoding of the 'system' container
using the SIDs defined in [I-D.somaraju-core-sid] Appendix C. using the SIDs defined in [I-D.ietf-core-sid] Appendix C.
Definition example from [RFC7317]: Definition example from [RFC7317]:
typedef date-and-time { typedef date-and-time {
type string { type string {
pattern '\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(\.\d+)?(Z|[\+\-] pattern '\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(\.\d+)?(Z|[\+\-]
\d{2}:\d{2})'; \d{2}:\d{2})';
} }
} }
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78 1a # text(26) 78 1a # text(26)
323031352d30392d31355430393a31323a35385a2d30353a3030 323031352d30392d31355430393a31323a35385a2d30353a3030
4.2.2. Member names as keys 4.2.2. Member names as keys
Keys implemented using member names MUST be encoded using a CBOR text Keys implemented using member names MUST be encoded using a CBOR text
string data item (major type 3). A namespace-qualified member name string data item (major type 3). A namespace-qualified member name
MUST be used for all members of a top-level collection, and then also MUST be used for all members of a top-level collection, and then also
whenever the namespaces of the schema node and its parent are whenever the namespaces of the schema node and its parent are
different. In all other cases, the simple form of the member name different. In all other cases, the simple form of the member name
MUST be used. Names and namespaces are defined in MUST be used. Names and namespaces are defined in [RFC7951] section
[I-D.ietf-netmod-yang-json] section 4. 4.
The following example shows the encoding of the the 'system' The following example shows the encoding of the 'system' container
container using names. This example is described in Section 4.2.1. using names. This example is described in Section 4.2.1.
CBOR diagnostic notation: CBOR diagnostic notation:
{ {
"ietf-system:clock" : { "ietf-system:clock" : {
"current-datetime" : "2015-10-02T14:47:24Z-05:00", "current-datetime" : "2015-10-02T14:47:24Z-05:00",
"boot-datetime" : "2015-09-15T09:12:58Z-05:00" "boot-datetime" : "2015-09-15T09:12:58Z-05:00"
} }
} }
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4.4. The 'list' Data Node 4.4. The 'list' Data Node
A list MUST be encoded using a CBOR array data item (major type 4). A list MUST be encoded using a CBOR array data item (major type 4).
Each list instance within this CBOR array is encoded using a CBOR map Each list instance within this CBOR array is encoded using a CBOR map
data item (major type 5) based on the same rules as a YANG container data item (major type 5) based on the same rules as a YANG container
as defined in Section 4.2. as defined in Section 4.2.
4.4.1. SIDs as keys 4.4.1. SIDs as keys
The follwoing example show the encoding a the 'server' list using the The follwoing example show the encoding a the 'server' list using the
SIDs defined in [I-D.somaraju-core-sid] Appendix C. It is important SIDs defined in [I-D.ietf-core-sid] Appendix C. It is important to
to note that the protocol or method using this mapping may carry a note that the protocol or method using this mapping may carry a
parent SID or may have the knowledge of this parent SID based on its parent SID or may have the knowledge of this parent SID based on its
context. In these cases, delta encoding can be performed based on context. In these cases, delta encoding can be performed based on
this parent SID which minimizes the size of the encoded data. this parent SID which minimizes the size of the encoded data.
The following example shows the encoding of the 'server' list The following example shows the encoding of the 'server' list
containing two enties. SIDs used in this example are defined in containing two enties. SIDs used in this example are defined in
[I-D.somaraju-core-sid] Appendix C. It is important to note that the [I-D.ietf-core-sid] Appendix C. It is important to note that the
protocol or method using this mapping may carry a parent SID or may protocol or method using this mapping may carry a parent SID or may
have the knowledge of this parent SID based on its context. In these have the knowledge of this parent SID based on its context. In these
cases, delta encoding can be performed based on this parent SID which cases, delta encoding can be performed based on this parent SID which
minimizes the size of the encoded data. minimizes the size of the encoded data.
Definition example from [RFC7317]: Definition example from [RFC7317]:
list server { list server {
key name; key name;
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6e # text(14) 6e # text(14)
4e52432054414320736572766572 # "NRC TAC server" 4e52432054414320736572766572 # "NRC TAC server"
19 06dd # unsigned(1757) 19 06dd # unsigned(1757)
a1 # map(1) a1 # map(1)
01 # unsigned(1) 01 # unsigned(1)
6a # text(10) 6a # text(10)
7461632e6e72632e6361 # "tac.nrc.ca" 7461632e6e72632e6361 # "tac.nrc.ca"
4.4.2. Member names as keys 4.4.2. Member names as keys
The following example shows the encoding of the the 'server' list The following example shows the encoding of the 'server' list using
using names. This example is described in Section 4.4.1. names. This example is described in Section 4.4.1.
CBOR diagnostic notation: CBOR diagnostic notation:
[ [
{ {
"ietf-system:name" : "NRC TIC server", "ietf-system:name" : "NRC TIC server",
"ietf-system:udp" : { "ietf-system:udp" : {
"address" : "tic.nrc.ca", "address" : "tic.nrc.ca",
"port" : 123 "port" : 123
}, },
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range "-1500 .. 1500"; range "-1500 .. 1500";
} }
} }
CBOR diagnostic notation: -300 CBOR diagnostic notation: -300
CBOR encoding: 39 012b CBOR encoding: 39 012b
5.3. The 'decimal64' Type 5.3. The 'decimal64' Type
Leafs of type decimal64 MUST be encoded using either CBOR unsigned Leafs of type decimal64 MUST be encoded using a decimal fraction as
integer (major type 0) or CBOR signed integer (major type 1), defined in [RFC7049] section 2.4.3.
depending on the actual value. The position of the decimal point is
defined by the fraction-digits YANG statement and is not available in
the CBOR encoding.
The following example shows the encoding of leaf 'my-decimal' set to The following example shows the encoding of leaf 'my-decimal' set to
2.57. 2.57.
Definition example from [RFC7317]: Definition example from [RFC7317]:
leaf my-decimal { leaf my-decimal {
type decimal64 { type decimal64 {
fraction-digits 2; fraction-digits 2;
range "1 .. 3.14 | 10 | 20..max"; range "1 .. 3.14 | 10 | 20..max";
} }
} }
CBOR diagnostic notation: 257 CBOR diagnostic notation: 4([-2, 257])
CBOR encoding: 19 0101 CBOR encoding: c4 82 21 19 0101
5.4. The 'string' Type 5.4. The 'string' Type
Leafs of type string MUST be encoded using a CBOR text string data Leafs of type string MUST be encoded using a CBOR text string data
item (major type 3). item (major type 3).
The following example shows the encoding of leaf 'name' set to The following example shows the encoding of leaf 'name' set to
"eth0". "eth0".
Definition example from [RFC7223]: Definition example from [RFC7223]:
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CBOR diagnostic notation: true CBOR diagnostic notation: true
CBOR encoding: f5 CBOR encoding: f5
5.6. The 'enumeration' Type 5.6. The 'enumeration' Type
Leafs of type enumeration MUST be encoded using a CBOR unsigned Leafs of type enumeration MUST be encoded using a CBOR unsigned
integer (major type 0) or CBOR signed integer (major type 1), integer (major type 0) or CBOR signed integer (major type 1),
depending on the actual value. Enumeration values are either depending on the actual value. Enumeration values are either
explicitly assigned using the YANG statement 'value' or automatically explicitly assigned using the YANG statement 'value' or automatically
assigned based on the algorithm defined in assigned based on the algorithm defined in [RFC7950] section 9.6.4.2.
[I-D.ietf-netmod-rfc6020bis] section 9.6.4.2.
The following example shows the encoding of leaf 'oper-status' set to The following example shows the encoding of leaf 'oper-status' set to
'testing'. 'testing'.
Definition example from [RFC7317]: Definition example from [RFC7317]:
leaf oper-status { leaf oper-status {
type enumeration { type enumeration {
enum up { value 1; } enum up { value 1; }
enum down { value 2; } enum down { value 2; }
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type enumeration { type enumeration {
enum up { value 1; } enum up { value 1; }
enum down { value 2; } enum down { value 2; }
enum testing { value 3; } enum testing { value 3; }
enum unknown { value 4; } enum unknown { value 4; }
enum dormant { value 5; } enum dormant { value 5; }
enum not-present { value 6; } enum not-present { value 6; }
enum lower-layer-down { value 7; } enum lower-layer-down { value 7; }
} }
} }
CBOR diagnostic notation: 3 CBOR diagnostic notation: 3
CBOR encoding: 03 CBOR encoding: 03
5.7. The 'bits' Type 5.7. The 'bits' Type
Leafs of type bits MUST be encoded using a CBOR byte string data item Leafs of type bits MUST be encoded using a CBOR byte string data item
(major type 2). Bits position are either explicitly assigned using (major type 2). Bits position are either explicitly assigned using
the YANG statement 'position' or automatically assigned based on the the YANG statement 'position' or automatically assigned based on the
algorithm defined in [I-D.ietf-netmod-rfc6020bis] section 9.7.4.2. algorithm defined in [RFC7950] section 9.7.4.2.
Bits position 0 to 7 are assigned to the first byte within the byte Bits position 0 to 7 are assigned to the first byte within the byte
string, bits 8 to 15 to the second byte, and subsequent bytes are string, bits 8 to 15 to the second byte, and subsequent bytes are
assigned similarly. Within each byte, bits are assigned from least assigned similarly. Within each byte, bits are assigned from least
to most significant. to most significant.
The following example shows the encoding of leaf 'mybits' with the The following example shows the encoding of leaf 'mybits' with the
'disable-nagle' and '10-Mb-only' flags set. 'disable-nagle' and '10-Mb-only' flags set.
Definition example from [I-D.ietf-netmod-rfc6020bis]: Definition example from [RFC7950]:
leaf mybits { leaf mybits {
type bits { type bits {
bit disable-nagle { bit disable-nagle {
position 0; position 0;
} }
bit auto-sense-speed { bit auto-sense-speed {
position 1; position 1;
} }
bit 10-Mb-only { bit 10-Mb-only {
skipping to change at page 19, line 50 skipping to change at page 19, line 50
} }
} }
CBOR diagnostic notation: "eth1" CBOR diagnostic notation: "eth1"
CBOR encoding: 64 65746831 CBOR encoding: 64 65746831
5.10. The 'identityref' Type 5.10. The 'identityref' Type
This specification supports two approaches for encoding identityref, This specification supports two approaches for encoding identityref,
a SID as defined in [I-D.somaraju-core-sid] or a name as defined in a SID as defined in [I-D.ietf-core-sid] or a name as defined in
[I-D.ietf-netmod-yang-json] section 6.8. [RFC7951] section 6.8.
5.10.1. SIDs as identityref 5.10.1. SIDs as identityref
SIDs are globally unique and may be used as identityref. This SIDs are globally unique and may be used as identityref. This
approach is both compact and simple to implement. When SIDs are approach is both compact and simple to implement. When SIDs are
used, identityref MUST be encoded using a CBOR unsigned integer data used, identityref MUST be encoded using a CBOR unsigned integer data
item (major type 0) and set to a SID allocated from a registered SID item (major type 0) and set to a SID allocated from a registered SID
range. range.
The following example shows the encoding of leaf 'type' set to the The following example shows the encoding of leaf 'type' set to the
skipping to change at page 20, line 42 skipping to change at page 20, line 42
} }
} }
CBOR diagnostic notation: 1180 CBOR diagnostic notation: 1180
CBOR encoding: 19 049c CBOR encoding: 19 049c
5.10.2. Name as identityref 5.10.2. Name as identityref
Alternatively, an identityref may be encoded using a name as defined Alternatively, an identityref may be encoded using a name as defined
in [I-D.ietf-netmod-yang-json] section 6.8. When names are used, in [RFC7951] section 6.8. When names are used, identityref MUST be
identityref MUST be encoded using a CBOR text string data item (major encoded using a CBOR text string data item (major type 3). If the
type 3). If the identity is defined in another module than the leaf identity is defined in another module than the leaf node containing
node containing the identityref value, the namespace-qualified form the identityref value, the namespace-qualified form MUST be used.
MUST be used. Otherwise, both the simple and namespace-qualified Otherwise, both the simple and namespace-qualified forms are
forms are permitted. Names and namespaces are defined in permitted. Names and namespaces are defined in [RFC7951] section 4.
[I-D.ietf-netmod-yang-json] section 4.
The following example shows the encoding of the identity 'iana-if- The following example shows the encoding of the identity 'iana-if-
type:ethernetCsmacd' using its name. This example is described in type:ethernetCsmacd' using its name. This example is described in
Section 5.10.1. Section 5.10.1.
CBOR diagnostic notation: "iana-if-type:ethernetCsmacd" CBOR diagnostic notation: "iana-if-type:ethernetCsmacd"
CBOR encoding: 78 1b CBOR encoding: 78 1b
69616e612d69662d747970653a65746865726e657443736d616364 69616e612d69662d747970653a65746865726e657443736d616364
skipping to change at page 21, line 37 skipping to change at page 21, line 37
5.12. The 'union' Type 5.12. The 'union' Type
Leafs of type union MUST be encoded using the rules associated with Leafs of type union MUST be encoded using the rules associated with
one of the types listed. When used in a union, the following YANG one of the types listed. When used in a union, the following YANG
datatypes are prefixed by CBOR tag to avoid confusion between datatypes are prefixed by CBOR tag to avoid confusion between
different YANG datatypes encoded using the same CBOR major type. different YANG datatypes encoded using the same CBOR major type.
o bits o bits
o decimal64
o enumeration o enumeration
o identityref o identityref
o instance-identifier o instance-identifier
o leafref (Only when the datatype of the leaf referenced using the
'path' YANG statement require a CBOR tag)
See Section 7.1 for more information about these CBOR tags. See Section 7.1 for more information about these CBOR tags.
The following example shows the encoding of leaf 'ip-address' when The following example shows the encoding of leaf 'ip-address' when
set to "2001:db8:a0b:12f0::1". set to "2001:db8:a0b:12f0::1".
Definition example from [RFC7317]: Definition example from [RFC7317]:
typedef ipv4-address { typedef ipv4-address {
type string { type string {
pattern '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3} pattern '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}
skipping to change at page 22, line 44 skipping to change at page 22, line 42
type inet:ip-address; type inet:ip-address;
} }
CBOR diagnostic notation: "2001:db8:a0b:12f0::1" CBOR diagnostic notation: "2001:db8:a0b:12f0::1"
CBOR encoding: 74 323030313a6462383a6130623a313266303a3a31 CBOR encoding: 74 323030313a6462383a6130623a313266303a3a31
5.13. The 'instance-identifier' Type 5.13. The 'instance-identifier' Type
This specification supports two approaches for encoding an instance- This specification supports two approaches for encoding an instance-
identifier, one based on SIDs as defined in [I-D.somaraju-core-sid] identifier, one based on SIDs as defined in [I-D.ietf-core-sid] and
and one based on names as defined in [I-D.ietf-netmod-yang-json] one based on names as defined in [RFC7951] section 6.11.
section 6.13.
5.13.1. SIDs as instance-identifier 5.13.1. SIDs as instance-identifier
SIDs uniquely identify a data node. For a single instance data node, SIDs uniquely identify a data node. In the case of a single instance
the SID is sufficient to identify this instance. For a multi- data node, a data node defined at the root of a YANG module or
instance data node, a SID is combined with the list key(s) to submodule or data nodes defined within a container, the SID is
identify each instance of this data node within the YANG list(s). sufficient to identify this instance.
In the case of a data node member of a YANG list, a SID is combined
with the list key(s) to identify each instance within the YANG
list(s).
Single instance data nodes MUST be encoded using a CBOR unsigned Single instance data nodes MUST be encoded using a CBOR unsigned
integer data item (major type 0) and set to the targeted data node integer data item (major type 0) and set to the targeted data node
SID. SID.
Multi-instances data nodes MUST be encoded using a CBOR array data Data nodes member of a YANG list MUST be encoded using a CBOR array
item (major type 4) containing the following entries: data item (major type 4) containing the following entries:
o The first entry MUST be encoded as a CBOR unsigned integer data o The first entry MUST be encoded as a CBOR unsigned integer data
item (major type 0) and set to the targeted data node SID. item (major type 0) and set to the targeted data node SID.
o The following entries MUST contain the value of each key required o The following entries MUST contain the value of each key required
to identify the instance of the targeted data node. These keys to identify the instance of the targeted data node. These keys
MUST be ordered as defined in the 'key' YANG statement, starting MUST be ordered as defined in the 'key' YANG statement, starting
from top level list, and follow by each of the subordinate from top level list, and follow by each of the subordinate
list(s). list(s).
skipping to change at page 25, line 12 skipping to change at page 25, line 12
CBOR encoding: CBOR encoding:
82 # array(2) 82 # array(2)
19 06be # unsigned(1726) 19 06be # unsigned(1726)
64 # text(4) 64 # text(4)
6a61636b # "jack" 6a61636b # "jack"
5.13.2. Names as instance-identifier 5.13.2. Names as instance-identifier
The use of names as instance-identifier is defined in The use of names as instance-identifier is defined in [RFC7951]
[I-D.ietf-netmod-yang-json] section 6.11. The resulting xpath MUST section 6.11. The resulting xpath MUST be encoded using a CBOR text
be encoded using a CBOR text string data item (major type 3). string data item (major type 3).
*First example:* *First example:*
This example is described in Section 5.13.1. This example is described in Section 5.13.1.
CBOR diagnostic notation: "/ietf-system:system/contact" CBOR diagnostic notation: "/ietf-system:system/contact"
CBOR encoding: CBOR encoding:
78 1c 2f20696574662d73797374656d3a73797374656d2f636f6e74616374 78 1c 2f20696574662d73797374656d3a73797374656d2f636f6e74616374
skipping to change at page 26, line 11 skipping to change at page 26, line 11
"/ietf-system:system/authentication/user[name='bob']" "/ietf-system:system/authentication/user[name='bob']"
CBOR encoding: CBOR encoding:
78 33 78 33
2f696574662d73797374656d3a73797374656d2f61757468656e74696361 2f696574662d73797374656d3a73797374656d2f61757468656e74696361
74696f6e2f757365725b6e616d653d27626f62275d 74696f6e2f757365725b6e616d653d27626f62275d
6. Security Considerations 6. Security Considerations
The security considerations of [RFC7049] and The security considerations of [RFC7049] and [RFC7950] apply.
[I-D.ietf-netmod-rfc6020bis] apply.
This document defines an alternative encoding for data modeled in the This document defines an alternative encoding for data modeled in the
YANG data modeling language. As such, this encoding does not YANG data modeling language. As such, this encoding does not
contribute any new security issues in addition of those identified contribute any new security issues in addition of those identified
for the specific protocol or context for which it is used. for the specific protocol or context for which it is used.
To minimize security risks, software on the receiving side SHOULD To minimize security risks, software on the receiving side SHOULD
reject all messages that do not comply to the rules of this document reject all messages that do not comply to the rules of this document
and reply with an appropriate error message to the sender. and reply with an appropriate error message to the sender.
skipping to change at page 26, line 35 skipping to change at page 26, line 34
7.1. Tags Registry 7.1. Tags Registry
This specification requires the assignment of CBOR tags for the This specification requires the assignment of CBOR tags for the
following YANG datatypes. These tags are added to the Tags Registry following YANG datatypes. These tags are added to the Tags Registry
as defined in section 7.2 of [RFC7049]. as defined in section 7.2 of [RFC7049].
+-----+---------------------+---------------------------+-----------+ +-----+---------------------+---------------------------+-----------+
| Tag | Data Item | Semantics | Reference | | Tag | Data Item | Semantics | Reference |
+-----+---------------------+---------------------------+-----------+ +-----+---------------------+---------------------------+-----------+
| 40 | bits | YANG bits datatype | RFC XXXX | | 40 | bits | YANG bits datatype | RFC XXXX |
| 41 | decimal64 | YANG decimal64 datatype | RFC XXXX | | 41 | enumeration | YANG enumeration datatype | RFC XXXX |
| 42 | enumeration | YANG enumeration datatype | RFC XXXX | | 42 | identityref | YANG identityref datatype | RFC XXXX |
| 43 | identityref | YANG identityref datatype | RFC XXXX | | 43 | instance-identifier | YANG instance-identifier | RFC XXXX |
| 44 | instance-identifier | YANG instance-identifier | RFC XXXX |
| | | datatype | | | | | datatype | |
+-----+---------------------+---------------------------+-----------+ +-----+---------------------+---------------------------+-----------+
// RFC Ed.: update Tag values using allocated tags if needed and // RFC Ed.: update Tag values using allocated tags if needed and
remove this note // RFC Ed.: replace XXXX with RFC number and remove remove this note // RFC Ed.: replace XXXX with RFC number and remove
this note this note
8. Acknowledgments 8. Acknowledgments
This document has been largely inspired by the extensive works done This document has been largely inspired by the extensive works done
by Andy Bierman and Peter van der Stok on [I-D.vanderstok-core-comi]. by Andy Bierman and Peter van der Stok on [I-D.vanderstok-core-comi].
[I-D.ietf-netmod-yang-json] has also been a critical input to this [RFC7951] has also been a critical input to this work. The authors
work. The authors would like to thank the authors and contributors would like to thank the authors and contributors to these two drafts.
to these two drafts.
The authors would also like to acknowledge the review, feedback, and The authors would also like to acknowledge the review, feedback, and
comments from Ladislav Lhotka and Juergen Schoenwaelder. comments from Ladislav Lhotka and Juergen Schoenwaelder.
9. References 9. References
9.1. Normative References 9.1. Normative References
[I-D.ietf-netmod-rfc6020bis]
Bjorklund, M., "The YANG 1.1 Data Modeling Language",
draft-ietf-netmod-rfc6020bis-14 (work in progress), June
2016.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997, DOI 10.17487/RFC2119, March 1997,
<http://www.rfc-editor.org/info/rfc2119>. <http://www.rfc-editor.org/info/rfc2119>.
[RFC7049] Bormann, C. and P. Hoffman, "Concise Binary Object [RFC7049] Bormann, C. and P. Hoffman, "Concise Binary Object
Representation (CBOR)", RFC 7049, DOI 10.17487/RFC7049, Representation (CBOR)", RFC 7049, DOI 10.17487/RFC7049,
October 2013, <http://www.rfc-editor.org/info/rfc7049>. October 2013, <http://www.rfc-editor.org/info/rfc7049>.
9.2. Informative References [RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
RFC 7950, DOI 10.17487/RFC7950, August 2016,
<http://www.rfc-editor.org/info/rfc7950>.
[I-D.ietf-netmod-yang-json] 9.2. Informative References
Lhotka, L., "JSON Encoding of Data Modeled with YANG",
draft-ietf-netmod-yang-json-10 (work in progress), March
2016.
[I-D.somaraju-core-sid] [I-D.ietf-core-sid]
Somaraju, A., Veillette, M., Pelov, A., Turner, R., and A. Somaraju, A., Veillette, M., Pelov, A., Turner, R., and A.
Minaburo, "Structure Identifier (SID)", draft-somaraju- Minaburo, "YANG Schema Item iDentifier (SID)", draft-ietf-
core-sid-00 (work in progress), March 2016. core-sid-00 (work in progress), October 2016.
[I-D.vanderstok-core-comi] [I-D.vanderstok-core-comi]
Stok, P. and A. Bierman, "CoAP Management Interface", Stok, P., Bierman, A., Veillette, M., and A. Pelov, "CoAP
draft-vanderstok-core-comi-09 (work in progress), March Management Interface", draft-vanderstok-core-comi-10 (work
2016. in progress), October 2016.
[RFC7159] Bray, T., Ed., "The JavaScript Object Notation (JSON) Data [RFC7159] Bray, T., Ed., "The JavaScript Object Notation (JSON) Data
Interchange Format", RFC 7159, DOI 10.17487/RFC7159, March Interchange Format", RFC 7159, DOI 10.17487/RFC7159, March
2014, <http://www.rfc-editor.org/info/rfc7159>. 2014, <http://www.rfc-editor.org/info/rfc7159>.
[RFC7223] Bjorklund, M., "A YANG Data Model for Interface [RFC7223] Bjorklund, M., "A YANG Data Model for Interface
Management", RFC 7223, DOI 10.17487/RFC7223, May 2014, Management", RFC 7223, DOI 10.17487/RFC7223, May 2014,
<http://www.rfc-editor.org/info/rfc7223>. <http://www.rfc-editor.org/info/rfc7223>.
[RFC7228] Bormann, C., Ersue, M., and A. Keranen, "Terminology for [RFC7228] Bormann, C., Ersue, M., and A. Keranen, "Terminology for
skipping to change at page 28, line 18 skipping to change at page 28, line 9
<http://www.rfc-editor.org/info/rfc7228>. <http://www.rfc-editor.org/info/rfc7228>.
[RFC7277] Bjorklund, M., "A YANG Data Model for IP Management", [RFC7277] Bjorklund, M., "A YANG Data Model for IP Management",
RFC 7277, DOI 10.17487/RFC7277, June 2014, RFC 7277, DOI 10.17487/RFC7277, June 2014,
<http://www.rfc-editor.org/info/rfc7277>. <http://www.rfc-editor.org/info/rfc7277>.
[RFC7317] Bierman, A. and M. Bjorklund, "A YANG Data Model for [RFC7317] Bierman, A. and M. Bjorklund, "A YANG Data Model for
System Management", RFC 7317, DOI 10.17487/RFC7317, August System Management", RFC 7317, DOI 10.17487/RFC7317, August
2014, <http://www.rfc-editor.org/info/rfc7317>. 2014, <http://www.rfc-editor.org/info/rfc7317>.
[RFC7951] Lhotka, L., "JSON Encoding of Data Modeled with YANG",
RFC 7951, DOI 10.17487/RFC7951, August 2016,
<http://www.rfc-editor.org/info/rfc7951>.
Authors' Addresses Authors' Addresses
Michel Veillette (editor) Michel Veillette (editor)
Trilliant Networks Inc. Trilliant Networks Inc.
610 Rue du Luxembourg 610 Rue du Luxembourg
Granby, Quebec J2J 2V2 Granby, Quebec J2J 2V2
Canada Canada
Phone: +14503750556 Phone: +14503750556
Email: michel.veillette@trilliantinc.com Email: michel.veillette@trilliantinc.com
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