ControlCommand » History » Version 23
Junxiao Shi, 10/12/2014 01:06 PM
| 1 | 13 | Junxiao Shi | # Control Command |
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| 2 | 1 | Junxiao Shi | |
| 3 | 13 | Junxiao Shi | **Control Command** is a mechanism of [[Management|NFD Management protocol]]. |
| 4 | This document defines the request and response format of commands that can alter forwarder state, and how these commands should be signed and authenticated. |
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| 5 | This mechanism is useful for altering forwarder state. |
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| 6 | 1 | Junxiao Shi | |
| 7 | ## Request format |
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| 8 | 9 | Anonymous | |
| 9 | 23 | Junxiao Shi | Control commands are [[ndn-cxx:SignedInterest|Signed Interests]] under a NFD management prefix. |
| 10 | 1 | Junxiao Shi | |
| 11 | 22 | Junxiao Shi | The Name for a request Interest has the following form: |
| 12 | 1 | Junxiao Shi | |
| 13 | 23 | Junxiao Shi | /<prefix>/<management-module>/<command-verb>/<control-parameters>/<signed-interest-components> |
| 14 | 1 | Junxiao Shi | |
| 15 | 23 | Junxiao Shi | * *prefix* is a NFD management prefix. |
| 16 | Unless otherwise noted, all commands use `/localhost/nfd` prefix. |
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| 17 | Each individual command MAY specify additional prefixes under which that command could be accepted. |
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| 18 | 22 | Junxiao Shi | * *management-module* is the name of management module to which the command needs to be dispatched. |
| 19 | * *command-verb* is the command to be executed. |
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| 20 | * *control-parameters* is a ControlParameters TLV block wrapped in a NameComponent. |
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| 21 | * *signed-interest-components* are four additional components defined by [ndn-cxx:SignedInterest|Signed Interest] spec |
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| 22 | 1 | Junxiao Shi | |
| 23 | 13 | Junxiao Shi | ### ControlParameters |
| 24 | 1 | Junxiao Shi | |
| 25 | 13 | Junxiao Shi | ControlParameters block contains arguments to the command. |
| 26 | 1 | Junxiao Shi | |
| 27 | 14 | Junxiao Shi | ControlParameters ::= CONTROL-PARAMETERS-TYPE TLV-LENGTH |
| 28 | Name? |
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| 29 | FaceId? |
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| 30 | Uri? |
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| 31 | LocalControlFeature? |
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| 32 | 19 | Junxiao Shi | Origin? |
| 33 | 1 | Junxiao Shi | Cost? |
| 34 | 19 | Junxiao Shi | Flags? |
| 35 | 17 | Junxiao Shi | Strategy? |
| 36 | ExpirationPeriod? |
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| 37 | 13 | Junxiao Shi | |
| 38 | // Name is defined in NDN-TLV spec |
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| 39 | |||
| 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 | 14 | Junxiao Shi | LocalControlFeature ::= LOCAL-CONTROL-FEATURE-TYPE TLV-LENGTH |
| 47 | nonNegativeInteger |
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| 48 | 13 | Junxiao Shi | |
| 49 | 19 | Junxiao Shi | Origin ::= ORIGIN-TYPE TLV-LENGTH |
| 50 | 17 | Junxiao Shi | nonNegativeInteger |
| 51 | |||
| 52 | 1 | Junxiao Shi | Cost ::= COST-TYPE TLV-LENGTH |
| 53 | nonNegativeInteger |
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| 54 | |||
| 55 | 19 | Junxiao Shi | Flags ::= FLAGS-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 | nonNegativeInteger |
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| 63 | 13 | Junxiao Shi | |
| 64 | 1 | Junxiao Shi | This definition exhausts all possible fields used in existing commands. |
| 65 | 13 | Junxiao Shi | |
| 66 | 1 | Junxiao Shi | Each individual command MUST specify: |
| 67 | 13 | Junxiao Shi | |
| 68 | * a list of required fields: those fields MUST be present |
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| 69 | * a list of optional fields: those fields MAY be present |
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| 70 | 1 | Junxiao Shi | * the semantics of each required and optional fields |
| 71 | 13 | Junxiao Shi | |
| 72 | 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. |
| 73 | |||
| 74 | 17 | Junxiao Shi | Each individual command MAY impose additional constraints on certain fields. |
| 75 | 1 | Junxiao Shi | |
| 76 | ## Response format |
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| 77 | |||
| 78 | A response from the command interface is a Data that matches the request Interest. |
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| 79 | 13 | Junxiao Shi | The payload of this Data is a ControlResponse block. |
| 80 | 1 | Junxiao Shi | |
| 81 | ControlResponse ::= CONTROL-RESPONSE-TYPE TLV-LENGTH |
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| 82 | StatusCode |
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| 83 | StatusText |
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| 84 | 13 | Junxiao Shi | <body>? |
| 85 | 1 | Junxiao Shi | |
| 86 | StatusCode ::= STATUS-CODE-TYPE TLV-LENGTH |
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| 87 | nonNegativeInteger |
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| 88 | |||
| 89 | 13 | Junxiao Shi | StatusText ::= STATUS-TEXT-TYPE TLV-LENGTH |
| 90 | 2 | Junxiao Shi | string in UTF-8 |
| 91 | 1 | Junxiao Shi | |
| 92 | 20 | Junxiao Shi | <body> ::= zero or more arbitrary TLV blocks |
| 93 | 1 | Junxiao Shi | |
| 94 | 13 | Junxiao Shi | ### StatusCode |
| 95 | 2 | Junxiao Shi | |
| 96 | 16 | Junxiao Shi | StatusCode generally follows HTTP convention \[[RFC2616](http://tools.ietf.org/html/rfc2616#section-10)\]. |
| 97 | |||
| 98 | * Codes between 100 and 399 represents a success. |
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| 99 | * Codes between 400 and 499 represents a client error. |
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| 100 | * Codes between 500 and 599 represents a server error. |
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| 101 | |||
| 102 | 13 | Junxiao Shi | Common codes include: |
| 103 | 1 | Junxiao Shi | |
| 104 | StatusCode | Description |
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| 105 | -----------|------------------------ |
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| 106 | 13 | Junxiao Shi | 200 | OK |
| 107 | 2 | Junxiao Shi | 400 | ControlParameters is incorrect |
| 108 | 16 | Junxiao Shi | 403 | Command Interest is not authorized |
| 109 | 404 | Resource (e.g. face, prefix, ...) not found |
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| 110 | 19 | Junxiao Shi | 501 | Module or verb is not supported |
| 111 | 503 | Service not available |
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| 112 | 1 | Junxiao Shi | |
| 113 | Each individual command MAY define additional codes. |
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| 114 | 13 | Junxiao Shi | |
| 115 | 1 | Junxiao Shi | ### \<body> |
| 116 | 13 | Junxiao Shi | |
| 117 | 2 | Junxiao Shi | Additional elements are allowed at the end of ControlResponse. |
| 118 | 13 | Junxiao Shi | |
| 119 | 1 | Junxiao Shi | Each individual command MAY define the type and meaning of \<body>. |
| 120 | 14 | Junxiao Shi | |
| 121 | 1 | Junxiao Shi | Unless otherwise defined by an individual command, |
| 122 | 14 | Junxiao Shi | \<body> is the ControlParameters passed into this command for all successful responses, |
| 123 | 17 | Junxiao Shi | and \<body> is empty for all failure responses. |
| 124 | 14 | Junxiao Shi | |
| 125 | 1 | Junxiao Shi | ## TLV-TYPE assignments |
| 126 | 13 | Junxiao Shi | |
| 127 | 1 | Junxiao Shi | Type | Assigned value | Assigned value (hex) |
| 128 | ------------------------------------------- | ----------------- | -------------------- |
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| 129 | 13 | Junxiao Shi | ControlParameters | 104 | 0x68 |
| 130 | FaceId | 105 | 0x69 |
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| 131 | 1 | Junxiao Shi | Uri | 114 | 0x72 |
| 132 | 13 | Junxiao Shi | LocalControlFeature | 110 | 0x6e |
| 133 | 19 | Junxiao Shi | Origin | 111 | 0x6f |
| 134 | 1 | Junxiao Shi | Cost | 106 | 0x6a |
| 135 | 19 | Junxiao Shi | Flags | 108 | 0x6c |
| 136 | 17 | Junxiao Shi | Strategy | 107 | 0x6b |
| 137 | ExpirationPeriod | 109 | 0x6d |
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| 138 | 5 | Alex Afanasyev | ControlResponse | 101 | 0x65 |
| 139 | StatusCode | 102 | 0x66 |
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| 140 | StatusText | 103 | 0x67 |
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| 141 | 13 | Junxiao Shi | |
| 142 | These types are assigned from the range reserved for forwarding daemon. |