FaceMgmt » History » Version 32
Junxiao Shi, 03/29/2014 09:06 PM
| 1 | 20 | Junxiao Shi | # Face Management |
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| 2 | 1 | Junxiao Shi | |
| 3 | 20 | Junxiao Shi | **Face Management** is a module of [[Management|NFD Management protocol]]. |
| 4 | It provides: |
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| 5 | 1 | Junxiao Shi | |
| 6 | 20 | Junxiao Shi | * commands to create and destroy faces |
| 7 | * commands to enable and disable [[LocalControlHeader]] features on a face |
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| 8 | * a dataset of description of all active faces and their counters |
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| 9 | * a notification stream for face creating and destroying events |
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| 10 | 1 | Junxiao Shi | |
| 11 | 20 | Junxiao Shi | Face Management commands, datasets, and notifications are published in namespace `ndn:/localhost/nfd/faces`. |
| 12 | 12 | Alex Afanasyev | |
| 13 | |||
| 14 | 20 | Junxiao Shi | ## FaceUri |
| 15 | 1 | Junxiao Shi | |
| 16 | 27 | Junxiao Shi | A FaceUri represents the underlying protocol and address used by a Face. |
| 17 | Every Face has two FaceUris: one for local endpoint, and the other for remote endpoint. |
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| 18 | 1 | Junxiao Shi | |
| 19 | 27 | Junxiao Shi | ### UDP |
| 20 | 9 | Junxiao Shi | |
| 21 | 30 | Junxiao Shi | `udp[4|6]://<IP-or-host>[:<port>]` |
| 22 | 2 | Alex Afanasyev | |
| 23 | 9 | Junxiao Shi | Examples: |
| 24 | 1 | Junxiao Shi | |
| 25 | 20 | Junxiao Shi | * `udp4://192.0.2.1:6363` (canonical form) |
| 26 | * `udp6://[2001:db8::1]:6363` (canonical form) |
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| 27 | 1 | Junxiao Shi | * `udp://192.0.2.1` (remote-port defaults to 6363) |
| 28 | * `udp://example.net:6363` |
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| 29 | * `udp4://example.net:6363` (resolve hostname to IPv4 address only) |
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| 30 | 9 | Junxiao Shi | * `udp6://example.net:6363` (resolve hostname to IPv6 address only) |
| 31 | 27 | Junxiao Shi | * `udp4://224.0.23.170:56363` (multicast, canonical form) |
| 32 | 1 | Junxiao Shi | |
| 33 | ### TCP |
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| 34 | |||
| 35 | 30 | Junxiao Shi | `tcp[4|6]://<IP-or-host>[:<port>]` |
| 36 | 1 | Junxiao Shi | |
| 37 | Examples: |
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| 38 | |||
| 39 | 20 | Junxiao Shi | * `tcp4://192.0.2.1:6363` (canonical form) |
| 40 | * `tcp6://[2001:db8::1]:6363` (canonical form) |
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| 41 | 1 | Junxiao Shi | * `tcp://192.0.2.1` (remote-port defaults to 6363) |
| 42 | * `tcp://example.net:6363` |
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| 43 | 9 | Junxiao Shi | * `tcp4://example.net:6363` (resolve hostname to IPv4 address only) |
| 44 | 1 | Junxiao Shi | * `tcp6://example.net:6363` (resolve hostname to IPv6 address only) |
| 45 | |||
| 46 | ### UNIX stream |
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| 47 | 9 | Junxiao Shi | |
| 48 | 1 | Junxiao Shi | `unix://<path>` |
| 49 | 9 | Junxiao Shi | |
| 50 | 1 | Junxiao Shi | Examples: |
| 51 | |||
| 52 | * `unix:///var/run/nfd.sock` (note there are three forward-slashes after 'unix') |
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| 53 | |||
| 54 | 30 | Junxiao Shi | ### File Descriptor |
| 55 | |||
| 56 | `fd://<file-descriptor>` |
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| 57 | |||
| 58 | Examples: |
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| 59 | |||
| 60 | * `fd://6` |
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| 61 | |||
| 62 | 1 | Junxiao Shi | ### Ethernet |
| 63 | 27 | Junxiao Shi | |
| 64 | 30 | Junxiao Shi | `ether://<MAC>` |
| 65 | 1 | Junxiao Shi | |
| 66 | Examples: |
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| 67 | |||
| 68 | * `ether://08:00:27:01:01:01` |
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| 69 | * `ether://33:33:01:01:01:01` (multicast) |
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| 70 | |||
| 71 | 30 | Junxiao Shi | ### Network Device |
| 72 | 1 | Junxiao Shi | |
| 73 | 30 | Junxiao Shi | `dev://<ifname>` |
| 74 | |||
| 75 | Examples: |
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| 76 | |||
| 77 | * `dev://eth0` |
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| 78 | |||
| 79 | ### Underlying protocol and FaceUri scheme |
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| 80 | |||
| 81 | Underlying protocol | remote FaceUri scheme | local FaceUri scheme |
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| 82 | ------------------- | -------------------------------- | -------------------------- |
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| 83 | IPv4 UDP unicast | udp4 | udp4 |
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| 84 | IPv6 UDP unicast | udp6 | udp6 |
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| 85 | IPv4 UDP multicast | udp4 (multicast IP) | udp4 (local IP, same port) |
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| 86 | IPv4 TCP | tcp4 | tcp4 |
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| 87 | IPv6 TCP | tcp6 | tcp6 |
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| 88 | UNIX stream | fd (file descriptor on NFD side) | unix (socket path) |
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| 89 | Ethernet multicast | ether | dev |
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| 90 | |||
| 91 | 20 | Junxiao Shi | ## Control Commands |
| 92 | |||
| 93 | 1 | Junxiao Shi | [[ControlCommand]] **management-module**: `faces` |
| 94 | |||
| 95 | ### Create a face |
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| 96 | 20 | Junxiao Shi | |
| 97 | 1 | Junxiao Shi | **command-verb**: `create` |
| 98 | |||
| 99 | 20 | Junxiao Shi | ControlParameters fields: |
| 100 | 1 | Junxiao Shi | |
| 101 | 30 | Junxiao Shi | * Uri (required): a UDP unicast or TCP FaceUri |
| 102 | 1 | Junxiao Shi | |
| 103 | 20 | Junxiao Shi | This command allows creation of UDP unicast and TCP faces only. |
| 104 | 30 | Junxiao Shi | If another face with same underlying protocol and remote address exists, the command is considered successful, and FaceId of that face is returned. |
| 105 | 1 | Junxiao Shi | |
| 106 | 20 | Junxiao Shi | If the command succeeds, \<Body> in ControlResponse block contains updated ControlParameters: |
| 107 | 1 | Junxiao Shi | |
| 108 | 20 | Junxiao Shi | * FaceId |
| 109 | * Uri: FaceUri in canonical form - hostname is substituted with IP address, scheme name indicates either IPv4 or IPv6 |
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| 110 | 1 | Junxiao Shi | |
| 111 | ### Destroy a face |
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| 112 | |||
| 113 | **command-verb:** `destroy` |
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| 114 | |||
| 115 | 20 | Junxiao Shi | ControlParameters fields: |
| 116 | 1 | Junxiao Shi | |
| 117 | 20 | Junxiao Shi | * FaceId (required) |
| 118 | 1 | Junxiao Shi | |
| 119 | If the specified face does not exist, this command does nothing, but is still considered successful. |
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| 120 | 20 | Junxiao Shi | |
| 121 | ### Enable a LocalControlHeader feature |
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| 122 | |||
| 123 | **command-verb**: `enable-local-control` |
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| 124 | |||
| 125 | ControlParameters fields: |
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| 126 | |||
| 127 | * LocalControlFeature (required): 1=IncomingFaceId, 2=NextHopFaceId |
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| 128 | 26 | Junxiao Shi | |
| 129 | 20 | Junxiao Shi | This command can only operate on the requesting face. |
| 130 | |||
| 131 | ### Disable a LocalControlHeader feature |
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| 132 | |||
| 133 | 1 | Junxiao Shi | **command-verb**: `disable-local-control` |
| 134 | 20 | Junxiao Shi | |
| 135 | ControlParameters fields: |
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| 136 | |||
| 137 | * LocalControlFeature (required): 1=IncomingFaceId, 2=NextHopFaceId |
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| 138 | 26 | Junxiao Shi | |
| 139 | 20 | Junxiao Shi | This command can only operate on the requesting face. |
| 140 | |||
| 141 | 1 | Junxiao Shi | ## Face Dataset |
| 142 | |||
| 143 | 20 | Junxiao Shi | Description and counters of all active faces are published as a [[StatusDataset|Status Dataset]] at `ndn:/localhost/nfd/faces/list`. |
| 144 | 1 | Junxiao Shi | |
| 145 | 32 | Junxiao Shi | Each face is represented by a **FaceStatus** block: |
| 146 | 20 | Junxiao Shi | |
| 147 | FaceStatus := FACE-STATUS-TYPE TLV-LENGTH |
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| 148 | 1 | Junxiao Shi | FaceId |
| 149 | Uri (remote FaceUri) |
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| 150 | 30 | Junxiao Shi | LocalUri |
| 151 | 32 | Junxiao Shi | FaceFlags |
| 152 | 20 | Junxiao Shi | NInInterests |
| 153 | NInDatas |
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| 154 | NOutInterests |
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| 155 | NOutDatas |
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| 156 | 1 | Junxiao Shi | |
| 157 | 32 | Junxiao Shi | LocalUri := LOCAL-URI-TYPE TLV-LENGTH |
| 158 | 1 | Junxiao Shi | RFC3986 URI in UTF-8 encoding |
| 159 | 32 | Junxiao Shi | |
| 160 | FaceFlags := FACE-FLAGS-TYPE TLV-LENGTH |
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| 161 | nonNegativeInteger |
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| 162 | 30 | Junxiao Shi | |
| 163 | 20 | Junxiao Shi | NInInterests := N-IN-INTERESTS-TYPE TLV-LENGTH |
| 164 | nonNegativeInteger |
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| 165 | |||
| 166 | NInDatas := N-IN-DATAS-TYPE TLV-LENGTH |
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| 167 | 1 | Junxiao Shi | nonNegativeInteger |
| 168 | |||
| 169 | NOutInterests := N-OUT-INTERESTS-TYPE TLV-LENGTH |
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| 170 | nonNegativeInteger |
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| 171 | |||
| 172 | NOutDatas := N-OUT-DATAS-TYPE TLV-LENGTH |
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| 173 | nonNegativeInteger |
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| 174 | |||
| 175 | 32 | Junxiao Shi | * **Uri** is a FaceUri representing remote endpoint. |
| 176 | * **LocalUri** is a FaceUri representing local endpoint. |
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| 177 | * **FaceFlags** is a bitset providing additional information about the face. The following bits are currently defined: |
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| 178 | * **1**: face is local |
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| 179 | * **2**: face is on demand - accepted incoming connection, instead of initiated outgoing connection |
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| 180 | * **NInInterests** is the total number of incoming Interests since the face is established. |
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| 181 | * **NInDatas** is the total number of incoming Datas since the face is established. |
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| 182 | * **NOutInterests** is the total number of outgoing Interests since the face is established. |
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| 183 | * **NOutDatas** is the total number of outgoing Datas since the face is established. |
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| 184 | 20 | Junxiao Shi | |
| 185 | ## Face Status Change Notification |
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| 186 | |||
| 187 | Face status change events are published as a [[Notification|Notification Stream]] at `ndn:/localhost/nfd/faces/events`. |
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| 188 | 21 | Alex Afanasyev | Notifications of all faces are sent into the same notification stream. |
| 189 | 20 | Junxiao Shi | |
| 190 | 21 | Alex Afanasyev | The Content of each notification Data packet is a `FaceEventNotification` block: |
| 191 | |||
| 192 | 25 | Junxiao Shi | FaceEventNotification := FACE-EVENT-NOTIFICATION-TYPE TLV-LENGTH |
| 193 | 20 | Junxiao Shi | FaceEventKind |
| 194 | 25 | Junxiao Shi | FaceId |
| 195 | Uri |
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| 196 | 1 | Junxiao Shi | LocalUri |
| 197 | 23 | Alex Afanasyev | FaceFlags |
| 198 | 20 | Junxiao Shi | |
| 199 | FaceEventKind := FACE-EVENT-KIND-TYPE TLV-LENGTH |
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| 200 | 25 | Junxiao Shi | nonNegativeInteger |
| 201 | |||
| 202 | 23 | Alex Afanasyev | **FaceEventKind** indicates the kind of event. Its possible values are: |
| 203 | 25 | Junxiao Shi | |
| 204 | 23 | Alex Afanasyev | * **1**: face is created |
| 205 | * **2**: face is destroyed |
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| 206 | 25 | Junxiao Shi | |
| 207 | 23 | Alex Afanasyev | ## TLV-TYPE assignments |
| 208 | 9 | Junxiao Shi | |
| 209 | Type | Assigned value | Assigned value (hex) |
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| 210 | ------------------------------------------- | ----------------- | -------------------- |
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| 211 | 2 | Alex Afanasyev | FaceStatus | 128 | 0x80 |
| 212 | 30 | Junxiao Shi | LocalUri | 129 | 0x81 |
| 213 | 32 | Junxiao Shi | FaceFlags | 194 | 0xc2 |
| 214 | 20 | Junxiao Shi | NInInterests | 144 | 0x90 |
| 215 | NInDatas | 145 | 0x91 |
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| 216 | NOutInterests | 146 | 0x92 |
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| 217 | 22 | Alex Afanasyev | NOutDatas | 147 | 0x93 |
| 218 | 1 | Junxiao Shi | FaceEventNotification | 192 | 0xc0 |
| 219 | 24 | Alex Afanasyev | FaceEventKind | 193 | 0xc1 |