ControlCommand » History » Version 14
Junxiao Shi, 03/18/2014 11:03 AM
| 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 | 13 | Junxiao Shi | Control commands are signed [[Command Interests]] under `ndn:/localhost/nfd` prefix. |
| 10 | 11 | Alex Afanasyev | |
| 11 | 13 | Junxiao Shi | /localhost/nfd/<management-module>/<command-verb>/................./............................... |
| 12 | \ / \ / |
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| 13 | ------ ------ -------------- -------------- |
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| 14 | \/ \/ |
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| 15 | ControlParameters Command Interest security |
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| 16 | 1 | Junxiao Shi | |
| 17 | 13 | Junxiao Shi | A request Interest has 9 Name components. |
| 18 | These components are: |
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| 19 | 1 | Junxiao Shi | |
| 20 | 1. "localhost" in UTF-8 |
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| 21 | 2. "nfd" in UTF-8 |
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| 22 | 3. *management-module* in UTF-8, management module to which the command needs to be dispatched |
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| 23 | 4. *command-verb* in UTF-8, command to be executed |
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| 24 | 13 | Junxiao Shi | 5. *...*, a ControlParameters TLV block |
| 25 | 6. timestamp of [[Command Interests]] |
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| 26 | 7. random-value of [[Command Interests]] |
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| 27 | 8. SignatureInfo of [[Command Interests]] |
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| 28 | 9. SignatureValue of [[Command Interests]] |
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| 29 | 1 | Junxiao Shi | |
| 30 | 13 | Junxiao Shi | ### ControlParameters |
| 31 | 1 | Junxiao Shi | |
| 32 | 13 | Junxiao Shi | ControlParameters block contains arguments to the command. |
| 33 | 1 | Junxiao Shi | |
| 34 | 14 | Junxiao Shi | ControlParameters ::= CONTROL-PARAMETERS-TYPE TLV-LENGTH |
| 35 | Name? |
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| 36 | FaceId? |
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| 37 | Uri? |
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| 38 | LocalControlFeature? |
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| 39 | Cost? |
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| 40 | Strategy? |
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| 41 | 13 | Junxiao Shi | |
| 42 | // Name is defined in NDN-TLV spec |
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| 43 | |||
| 44 | 14 | Junxiao Shi | FaceId ::= FACE-ID-TYPE TLV-LENGTH |
| 45 | nonNegativeInteger |
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| 46 | 13 | Junxiao Shi | |
| 47 | 14 | Junxiao Shi | Uri ::= URI-TYPE TLV-LENGTH |
| 48 | RFC3986 URI in UTF-8 encoding |
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| 49 | 13 | Junxiao Shi | |
| 50 | 14 | Junxiao Shi | LocalControlFeature ::= LOCAL-CONTROL-FEATURE-TYPE TLV-LENGTH |
| 51 | nonNegativeInteger |
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| 52 | 13 | Junxiao Shi | |
| 53 | 14 | Junxiao Shi | Cost ::= COST-TYPE TLV-LENGTH |
| 54 | nonNegativeInteger |
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| 55 | 13 | Junxiao Shi | |
| 56 | 14 | Junxiao Shi | Strategy ::= STRATEGY-TYPE TLV-LENGTH |
| 57 | Name |
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| 58 | 1 | Junxiao Shi | |
| 59 | 13 | Junxiao Shi | This definition exhausts all possible fields used in existing commands. |
| 60 | 1 | Junxiao Shi | |
| 61 | 13 | Junxiao Shi | Each individual command MUST specify: |
| 62 | 1 | Junxiao Shi | |
| 63 | 13 | Junxiao Shi | * a list of required fields: those fields MUST be present |
| 64 | * a list of optional fields: those fields MAY be present |
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| 65 | * the semantics of each required and optional fields |
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| 66 | 1 | Junxiao Shi | |
| 67 | 13 | Junxiao Shi | A field that is neither required nor optional for a command MUST NOT be present in a ControlParameter given to that command. |
| 68 | 1 | Junxiao Shi | |
| 69 | 13 | Junxiao Shi | Each individual command MAY impose additional constraints to certain fields. |
| 70 | 1 | Junxiao Shi | |
| 71 | ## Response format |
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| 72 | |||
| 73 | A response from the command interface is a Data that matches the request Interest. |
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| 74 | 13 | Junxiao Shi | The payload of this Data is a ControlResponse block. |
| 75 | 1 | Junxiao Shi | |
| 76 | ControlResponse ::= CONTROL-RESPONSE-TYPE TLV-LENGTH |
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| 77 | StatusCode |
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| 78 | StatusText |
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| 79 | 13 | Junxiao Shi | <body>? |
| 80 | 1 | Junxiao Shi | |
| 81 | StatusCode ::= STATUS-CODE-TYPE TLV-LENGTH |
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| 82 | nonNegativeInteger |
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| 83 | |||
| 84 | 13 | Junxiao Shi | StatusText ::= STATUS-TEXT-TYPE TLV-LENGTH |
| 85 | 2 | Junxiao Shi | string in UTF-8 |
| 86 | 1 | Junxiao Shi | |
| 87 | 14 | Junxiao Shi | <body> ::= zero or more arbitary TLV blocks |
| 88 | 1 | Junxiao Shi | |
| 89 | 13 | Junxiao Shi | ### StatusCode |
| 90 | 2 | Junxiao Shi | |
| 91 | 1 | Junxiao Shi | StatusCode generally follows HTTP convention. |
| 92 | Codes between 100 and 399 are considered successful; all other codes are considered failure. |
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| 93 | Common codes include: |
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| 94 | |||
| 95 | 13 | Junxiao Shi | StatusCode | Description |
| 96 | -----------|------------------------ |
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| 97 | 2 | Junxiao Shi | 200 | OK |
| 98 | 1 | Junxiao Shi | 400 | Arguments are incorrect |
| 99 | 2 | Junxiao Shi | 403 | Signing key is not authorized for this command |
| 100 | 6 | Alex Afanasyev | 404 | Resource (e.g. face, prefix, ...) not found |
| 101 | 1 | Junxiao Shi | 501 | Command verb is not supported |
| 102 | 6 | Alex Afanasyev | |
| 103 | 1 | Junxiao Shi | Each individual command MAY define additional codes. |
| 104 | |||
| 105 | 13 | Junxiao Shi | ### \<body> |
| 106 | 1 | Junxiao Shi | |
| 107 | 13 | Junxiao Shi | Additional elements are allowed at the end of ControlResponse. |
| 108 | 2 | Junxiao Shi | |
| 109 | 13 | Junxiao Shi | Each individual command MAY define the type and meaning of \<body>. |
| 110 | 1 | Junxiao Shi | |
| 111 | 14 | Junxiao Shi | Unless otherwise defined by an individual command, |
| 112 | \<body> is the ControlParameters passed into this command for all successful responses, |
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| 113 | and \<body> is empty for all failure response. |
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| 114 | |||
| 115 | 13 | Junxiao Shi | ## TLV-TYPE assignments |
| 116 | |||
| 117 | 1 | Junxiao Shi | Type | Assigned value | Assigned value (hex) |
| 118 | ------------------------------------------- | ----------------- | -------------------- |
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| 119 | 13 | Junxiao Shi | ControlParameters | 104 | 0x68 |
| 120 | FaceId | 105 | 0x69 |
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| 121 | Uri | 114 | 0x72 |
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| 122 | 14 | Junxiao Shi | LocalControlFeature | 110 | 0x6e |
| 123 | 13 | Junxiao Shi | Cost | 106 | 0x6a |
| 124 | Strategy | 107 | 0x6b |
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| 125 | 5 | Alex Afanasyev | ControlResponse | 101 | 0x65 |
| 126 | StatusCode | 102 | 0x66 |
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| 127 | StatusText | 103 | 0x67 |
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| 128 | 13 | Junxiao Shi | |
| 129 | These types are assigned from the range reserved for forwarding daemon. |