LocalControlHeader » History » Version 4
Alex Afanasyev, 02/05/2014 04:26 PM
| 1 | 1 | Junxiao Shi | # NFD local control header |
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| 2 | 3 | Alex Afanasyev | |
| 3 | NFD local control header can be used between application and local forwarding daemon to exchange various NFD-specific local information that is not part of Interest and Data packet. |
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| 4 | For example, the control header allows applications to request bypassing the Interest forwarding strategy by directly specify FaceId to which the Interest should be forwarded. |
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| 5 | |||
| 6 | NFD local control header is not enabled by default and requires explicit request from the client to enable. |
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| 7 | This request is in form of [[Signed_Interests|Signed Interest]] and have the following structure: |
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| 8 | |||
| 9 | /localhost/nfd/control-header/<command-verb>/<timestamp>/<SignatureInfo>/<SignatureValue> |
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| 10 | |||
| 11 | \ / \ / \ / |
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| 12 | ------------ ------------ ---- ----- -------------------- -------------------- |
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| 13 | \/ \/ \/ |
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| 14 | NFD Control Command "enable" or Signed Interest related information |
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| 15 | "disable" |
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| 16 | |||
| 17 | |||
| 18 | ## LocalControlHeader |
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| 19 | |||
| 20 | If command to enable LocalControlHeader is authorized by NFD, all subsequent communication from NFD will include LocalControlHeader as defined below. |
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| 21 | The authorized application will also be able to include LocalControlHeader in communication to NFD---until specifically enabled, all specified LocalControlHeaders should be ignored by NFD. |
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| 22 | |||
| 23 | LocalControlHeader ::= LOCAL-CONTROL-HEADER-TYPE TLV-LENGTH |
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| 24 | LocalControlInfo |
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| 25 | (Interest | Data) |
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| 26 | |||
| 27 | LocalControlInfo ::= LOCAL-CONTROL-INFO-TYPE TLV-LENGTH |
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| 28 | 4 | Alex Afanasyev | (IncomingFaceId | |
| 29 | OutgoingFaceId | |
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| 30 | TapInfo) |
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| 31 | 1 | Junxiao Shi | |
| 32 | 4 | Alex Afanasyev | IncomingFaceId ::= INCOMING-FACE-ID-TYPE TLV-LENGTH |
| 33 | nonNegativeInteger |
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| 34 | 1 | Junxiao Shi | |
| 35 | 4 | Alex Afanasyev | OutgoingFaceId ::= INCOMING-FACE-ID-TYPE TLV-LENGTH |
| 36 | nonNegativeInteger |
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| 37 | |||
| 38 | TapInfo ::= TAP-INFO-TYPE TLV-LENGTH |
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| 39 | ... |
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| 40 | (TBD) |
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| 41 | |||
| 42 | |||
| 43 | 3 | Alex Afanasyev | ## TLV-TYPE assignments |
| 44 | |||
| 45 | Type | Assigned value | Assigned value (hex) |
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| 46 | ------------------------------------------- | ----------------- | -------------------- |
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| 47 | 1 | Junxiao Shi | LocalControlHeader | 109 | 0x6d |
| 48 | LocalControlInfo | 110 | 0x6e |
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| 49 | 4 | Alex Afanasyev | IncomingFaceId | 111 | 0x6f |
| 50 | OutgoingFaceId | 112 | 0x70 |
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| 51 | TapInfo | 113 | 0x71 |