ControlCommand » History » Version 29
Davide Pesavento, 02/13/2017 11:59 AM
| 1 | 13 | Junxiao Shi | # Control Command |
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| 2 | 1 | Junxiao Shi | |
| 3 | 29 | Davide Pesavento | **Control Command** is a mechanism of [[Management|NFD Management protocol]]. This mechanism is useful for altering the state of the forwarder. |
| 4 | 28 | Davide Pesavento | This document defines the request and response format of such commands, and how they should be signed and authenticated. |
| 5 | 1 | Junxiao Shi | |
| 6 | ## Request format |
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| 7 | 9 | Anonymous | |
| 8 | 26 | Junxiao Shi | Control commands are [[ndn-cxx:CommandInterest|Command Interests]] under a NFD management prefix. |
| 9 | 1 | Junxiao Shi | |
| 10 | 22 | Junxiao Shi | The Name for a request Interest has the following form: |
| 11 | 1 | Junxiao Shi | |
| 12 | 26 | Junxiao Shi | /<prefix>/<management-module>/<command-verb>/<control-parameters>/<command-interest-components> |
| 13 | 1 | Junxiao Shi | |
| 14 | 23 | Junxiao Shi | * *prefix* is a NFD management prefix. |
| 15 | Unless otherwise noted, all commands use `/localhost/nfd` prefix. |
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| 16 | Each individual command MAY specify additional prefixes under which that command could be accepted. |
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| 17 | 22 | Junxiao Shi | * *management-module* is the name of management module to which the command needs to be dispatched. |
| 18 | * *command-verb* is the command to be executed. |
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| 19 | * *control-parameters* is a ControlParameters TLV block wrapped in a NameComponent. |
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| 20 | 26 | Junxiao Shi | * *command-interest-components* are four additional components defined by [[ndn-cxx:CommandInterest|Command Interest]] spec. |
| 21 | 1 | Junxiao Shi | |
| 22 | 13 | Junxiao Shi | ### ControlParameters |
| 23 | 1 | Junxiao Shi | |
| 24 | 13 | Junxiao Shi | ControlParameters block contains arguments to the command. |
| 25 | 1 | Junxiao Shi | |
| 26 | 14 | Junxiao Shi | ControlParameters ::= CONTROL-PARAMETERS-TYPE TLV-LENGTH |
| 27 | Name? |
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| 28 | FaceId? |
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| 29 | 1 | Junxiao Shi | Uri? |
| 30 | 14 | Junxiao Shi | Origin? |
| 31 | 19 | Junxiao Shi | Cost? |
| 32 | 1 | Junxiao Shi | Flags? |
| 33 | 26 | Junxiao Shi | Mask? |
| 34 | 17 | Junxiao Shi | Strategy? |
| 35 | ExpirationPeriod? |
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| 36 | 24 | Junxiao Shi | FacePersistency? |
| 37 | 1 | Junxiao Shi | |
| 38 | 24 | Junxiao Shi | ; Name is defined in NDN packet format specification |
| 39 | 13 | Junxiao Shi | |
| 40 | 14 | Junxiao Shi | FaceId ::= FACE-ID-TYPE TLV-LENGTH |
| 41 | nonNegativeInteger |
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| 42 | 13 | Junxiao Shi | |
| 43 | 14 | Junxiao Shi | Uri ::= URI-TYPE TLV-LENGTH |
| 44 | RFC3986 URI in UTF-8 encoding |
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| 45 | 13 | Junxiao Shi | |
| 46 | 19 | Junxiao Shi | Origin ::= ORIGIN-TYPE TLV-LENGTH |
| 47 | 17 | Junxiao Shi | nonNegativeInteger |
| 48 | 1 | Junxiao Shi | |
| 49 | Cost ::= COST-TYPE TLV-LENGTH |
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| 50 | nonNegativeInteger |
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| 51 | 17 | Junxiao Shi | |
| 52 | 1 | Junxiao Shi | Flags ::= FLAGS-TYPE TLV-LENGTH |
| 53 | nonNegativeInteger |
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| 54 | |||
| 55 | 26 | Junxiao Shi | Mask ::= MASK-TYPE TLV-LENGTH |
| 56 | nonNegativeInteger |
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| 57 | |||
| 58 | 17 | Junxiao Shi | Strategy ::= STRATEGY-TYPE TLV-LENGTH |
| 59 | Name |
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| 60 | |||
| 61 | ExpirationPeriod ::= EXPIRATION-PERIOD-TYPE TLV-LENGTH |
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| 62 | 1 | Junxiao Shi | nonNegativeInteger |
| 63 | 24 | Junxiao Shi | |
| 64 | 26 | Junxiao Shi | ; FacePersistency is defined in FaceMgmt section |
| 65 | 24 | Junxiao Shi | |
| 66 | 1 | Junxiao Shi | This definition exhausts all possible fields used in existing commands. |
| 67 | 13 | Junxiao Shi | |
| 68 | 1 | Junxiao Shi | Each individual command MUST specify: |
| 69 | 13 | Junxiao Shi | |
| 70 | * a list of required fields: those fields MUST be present |
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| 71 | * a list of optional fields: those fields MAY be present |
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| 72 | 28 | Davide Pesavento | * the semantics of each required and optional field |
| 73 | 13 | Junxiao Shi | |
| 74 | 1 | Junxiao Shi | A field that is neither required nor optional for a command MUST NOT be present in a ControlParameter given to that command. |
| 75 | |||
| 76 | 17 | Junxiao Shi | Each individual command MAY impose additional constraints on certain fields. |
| 77 | 1 | Junxiao Shi | |
| 78 | ## Response format |
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| 79 | |||
| 80 | A response from the command interface is a Data that matches the request Interest. |
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| 81 | 13 | Junxiao Shi | The payload of this Data is a ControlResponse block. |
| 82 | 1 | Junxiao Shi | |
| 83 | ControlResponse ::= CONTROL-RESPONSE-TYPE TLV-LENGTH |
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| 84 | StatusCode |
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| 85 | StatusText |
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| 86 | 26 | Junxiao Shi | <body> |
| 87 | 1 | Junxiao Shi | |
| 88 | StatusCode ::= STATUS-CODE-TYPE TLV-LENGTH |
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| 89 | nonNegativeInteger |
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| 90 | |||
| 91 | 13 | Junxiao Shi | StatusText ::= STATUS-TEXT-TYPE TLV-LENGTH |
| 92 | 2 | Junxiao Shi | string in UTF-8 |
| 93 | 1 | Junxiao Shi | |
| 94 | 20 | Junxiao Shi | <body> ::= zero or more arbitrary TLV blocks |
| 95 | 1 | Junxiao Shi | |
| 96 | 13 | Junxiao Shi | ### StatusCode |
| 97 | 2 | Junxiao Shi | |
| 98 | 28 | Davide Pesavento | StatusCode loosely follows the HTTP semantics described in [RFC 7231](https://tools.ietf.org/html/rfc7231#section-6). |
| 99 | 16 | Junxiao Shi | |
| 100 | 28 | Davide Pesavento | * Codes between 100 and 399 represent a success. |
| 101 | * Codes between 400 and 499 represent a client error. |
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| 102 | * Codes between 500 and 599 represent a server error. |
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| 103 | 16 | Junxiao Shi | |
| 104 | 13 | Junxiao Shi | Common codes include: |
| 105 | 1 | Junxiao Shi | |
| 106 | StatusCode | Description |
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| 107 | -----------|------------------------ |
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| 108 | 13 | Junxiao Shi | 200 | OK |
| 109 | 2 | Junxiao Shi | 400 | ControlParameters is incorrect |
| 110 | 16 | Junxiao Shi | 403 | Command Interest is not authorized |
| 111 | 28 | Davide Pesavento | 404 | Resource (e.g., face, prefix, ...) not found |
| 112 | 19 | Junxiao Shi | 501 | Module or verb is not supported |
| 113 | 503 | Service not available |
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| 114 | 1 | Junxiao Shi | |
| 115 | Each individual command MAY define additional codes. |
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| 116 | 13 | Junxiao Shi | |
| 117 | 1 | Junxiao Shi | ### \<body> |
| 118 | 13 | Junxiao Shi | |
| 119 | 2 | Junxiao Shi | Additional elements are allowed at the end of ControlResponse. |
| 120 | 13 | Junxiao Shi | |
| 121 | 1 | Junxiao Shi | Each individual command MAY define the type and meaning of \<body>. |
| 122 | 14 | Junxiao Shi | |
| 123 | 1 | Junxiao Shi | Unless otherwise defined by an individual command, |
| 124 | 14 | Junxiao Shi | \<body> is the ControlParameters passed into this command for all successful responses, |
| 125 | and \<body> is empty for all failure responses. |
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| 126 | 1 | Junxiao Shi | |
| 127 | ## TLV-TYPE assignments |
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| 128 | 13 | Junxiao Shi | |
| 129 | 1 | Junxiao Shi | Type | Assigned value | Assigned value (hex) |
| 130 | 13 | Junxiao Shi | ------------------------------------------- | ----------------- | -------------------- |
| 131 | 1 | Junxiao Shi | ControlParameters | 104 | 0x68 |
| 132 | 13 | Junxiao Shi | FaceId | 105 | 0x69 |
| 133 | 1 | Junxiao Shi | Uri | 114 | 0x72 |
| 134 | 13 | Junxiao Shi | Origin | 111 | 0x6f |
| 135 | 19 | Junxiao Shi | Cost | 106 | 0x6a |
| 136 | 1 | Junxiao Shi | Flags | 108 | 0x6c |
| 137 | 26 | Junxiao Shi | Mask | 112 | 0x70 |
| 138 | 5 | Alex Afanasyev | Strategy | 107 | 0x6b |
| 139 | 1 | Junxiao Shi | ExpirationPeriod | 109 | 0x6d |
| 140 | 24 | Junxiao Shi | ControlResponse | 101 | 0x65 |
| 141 | 5 | Alex Afanasyev | StatusCode | 102 | 0x66 |
| 142 | 13 | Junxiao Shi | StatusText | 103 | 0x67 |
| 143 | 26 | Junxiao Shi | (reserved, formerly LocalControlFeature) | 110 | 0x6e |