FaceMgmt » History » Version 45
Junxiao Shi, 07/29/2015 08:34 AM
| 1 | 20 | Junxiao Shi | # Face Management |
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| 2 | 1 | Junxiao Shi | |
| 3 | 38 | Alex Afanasyev | {{toc}} |
| 4 | |||
| 5 | 20 | Junxiao Shi | **Face Management** is a module of [[Management|NFD Management protocol]]. |
| 6 | It provides: |
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| 7 | 1 | Junxiao Shi | |
| 8 | 20 | Junxiao Shi | * commands to create and destroy faces |
| 9 | * commands to enable and disable [[LocalControlHeader]] features on a face |
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| 10 | * a dataset of description of all active faces and their counters |
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| 11 | 33 | Junxiao Shi | * a dataset of description of all active channels |
| 12 | 20 | Junxiao Shi | * a notification stream for face creating and destroying events |
| 13 | 1 | Junxiao Shi | |
| 14 | 45 | Junxiao Shi | Face Management commands, datasets, and notifications are available under namespace `ndn:/localhost/nfd/faces`. |
| 15 | 12 | Alex Afanasyev | |
| 16 | |||
| 17 | 20 | Junxiao Shi | ## FaceUri |
| 18 | 1 | Junxiao Shi | |
| 19 | 27 | Junxiao Shi | A FaceUri represents the underlying protocol and address used by a Face. |
| 20 | Every Face has two FaceUris: one for local endpoint, and the other for remote endpoint. |
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| 21 | 1 | Junxiao Shi | |
| 22 | 27 | Junxiao Shi | ### UDP |
| 23 | 9 | Junxiao Shi | |
| 24 | 30 | Junxiao Shi | `udp[4|6]://<IP-or-host>[:<port>]` |
| 25 | 2 | Alex Afanasyev | |
| 26 | 9 | Junxiao Shi | Examples: |
| 27 | 1 | Junxiao Shi | |
| 28 | 20 | Junxiao Shi | * `udp4://192.0.2.1:6363` (canonical form) |
| 29 | * `udp6://[2001:db8::1]:6363` (canonical form) |
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| 30 | 1 | Junxiao Shi | * `udp://192.0.2.1` (remote-port defaults to 6363) |
| 31 | * `udp://example.net:6363` |
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| 32 | * `udp4://example.net:6363` (resolve hostname to IPv4 address only) |
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| 33 | 9 | Junxiao Shi | * `udp6://example.net:6363` (resolve hostname to IPv6 address only) |
| 34 | 27 | Junxiao Shi | * `udp4://224.0.23.170:56363` (multicast, canonical form) |
| 35 | 1 | Junxiao Shi | |
| 36 | ### TCP |
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| 37 | |||
| 38 | 30 | Junxiao Shi | `tcp[4|6]://<IP-or-host>[:<port>]` |
| 39 | 1 | Junxiao Shi | |
| 40 | Examples: |
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| 41 | |||
| 42 | 20 | Junxiao Shi | * `tcp4://192.0.2.1:6363` (canonical form) |
| 43 | * `tcp6://[2001:db8::1]:6363` (canonical form) |
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| 44 | 1 | Junxiao Shi | * `tcp://192.0.2.1` (remote-port defaults to 6363) |
| 45 | * `tcp://example.net:6363` |
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| 46 | 9 | Junxiao Shi | * `tcp4://example.net:6363` (resolve hostname to IPv4 address only) |
| 47 | 1 | Junxiao Shi | * `tcp6://example.net:6363` (resolve hostname to IPv6 address only) |
| 48 | |||
| 49 | ### UNIX stream |
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| 50 | 9 | Junxiao Shi | |
| 51 | 1 | Junxiao Shi | `unix://<path>` |
| 52 | 9 | Junxiao Shi | |
| 53 | 1 | Junxiao Shi | Examples: |
| 54 | |||
| 55 | * `unix:///var/run/nfd.sock` (note there are three forward-slashes after 'unix') |
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| 56 | |||
| 57 | 30 | Junxiao Shi | ### File Descriptor |
| 58 | |||
| 59 | `fd://<file-descriptor>` |
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| 60 | |||
| 61 | Examples: |
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| 62 | |||
| 63 | * `fd://6` |
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| 64 | |||
| 65 | 1 | Junxiao Shi | ### Ethernet |
| 66 | 27 | Junxiao Shi | |
| 67 | 42 | Junxiao Shi | `ether://[<MAC>]` |
| 68 | 1 | Junxiao Shi | |
| 69 | Examples: |
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| 70 | |||
| 71 | 42 | Junxiao Shi | * `ether://[08:00:27:01:01:01]` |
| 72 | * `ether://[33:33:01:01:01:01]` (multicast) |
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| 73 | 1 | Junxiao Shi | |
| 74 | 30 | Junxiao Shi | ### Network Device |
| 75 | 1 | Junxiao Shi | |
| 76 | 30 | Junxiao Shi | `dev://<ifname>` |
| 77 | |||
| 78 | Examples: |
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| 79 | |||
| 80 | * `dev://eth0` |
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| 81 | |||
| 82 | ### Underlying protocol and FaceUri scheme |
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| 83 | |||
| 84 | Underlying protocol | remote FaceUri scheme | local FaceUri scheme |
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| 85 | ------------------- | -------------------------------- | -------------------------- |
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| 86 | IPv4 UDP unicast | udp4 | udp4 |
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| 87 | IPv6 UDP unicast | udp6 | udp6 |
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| 88 | IPv4 UDP multicast | udp4 (multicast IP) | udp4 (local IP, same port) |
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| 89 | IPv4 TCP | tcp4 | tcp4 |
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| 90 | IPv6 TCP | tcp6 | tcp6 |
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| 91 | UNIX stream | fd (file descriptor on NFD side) | unix (socket path) |
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| 92 | Ethernet multicast | ether | dev |
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| 93 | |||
| 94 | 20 | Junxiao Shi | ## Control Commands |
| 95 | |||
| 96 | 1 | Junxiao Shi | [[ControlCommand]] **management-module**: `faces` |
| 97 | |||
| 98 | ### Create a face |
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| 99 | 20 | Junxiao Shi | |
| 100 | 1 | Junxiao Shi | **command-verb**: `create` |
| 101 | |||
| 102 | 20 | Junxiao Shi | ControlParameters fields: |
| 103 | 1 | Junxiao Shi | |
| 104 | 41 | Junxiao Shi | * Uri (required): a UDP unicast or TCP FaceUri |
| 105 | note: It's recommended to use a FaceUri in canonical form; passing a hostname is allowed but deprecated. |
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| 106 | 1 | Junxiao Shi | |
| 107 | 20 | Junxiao Shi | This command allows creation of UDP unicast and TCP faces only. |
| 108 | 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. |
| 109 | 1 | Junxiao Shi | |
| 110 | 20 | Junxiao Shi | If the command succeeds, \<Body> in ControlResponse block contains updated ControlParameters: |
| 111 | 1 | Junxiao Shi | |
| 112 | 20 | Junxiao Shi | * FaceId |
| 113 | * Uri: FaceUri in canonical form - hostname is substituted with IP address, scheme name indicates either IPv4 or IPv6 |
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| 114 | 1 | Junxiao Shi | |
| 115 | ### Destroy a face |
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| 116 | |||
| 117 | **command-verb:** `destroy` |
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| 118 | |||
| 119 | 20 | Junxiao Shi | ControlParameters fields: |
| 120 | 1 | Junxiao Shi | |
| 121 | 20 | Junxiao Shi | * FaceId (required) |
| 122 | 1 | Junxiao Shi | |
| 123 | If the specified face does not exist, this command does nothing, but is still considered successful. |
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| 124 | 20 | Junxiao Shi | |
| 125 | ### Enable a LocalControlHeader feature |
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| 126 | |||
| 127 | **command-verb**: `enable-local-control` |
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| 128 | |||
| 129 | ControlParameters fields: |
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| 130 | |||
| 131 | 43 | Junxiao Shi | * LocalControlFeature (required): 1=IncomingFaceId, 2=NextHopFaceId, 3=CachingPolicy |
| 132 | 26 | Junxiao Shi | |
| 133 | 20 | Junxiao Shi | This command can only operate on the requesting face. |
| 134 | |||
| 135 | ### Disable a LocalControlHeader feature |
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| 136 | |||
| 137 | 1 | Junxiao Shi | **command-verb**: `disable-local-control` |
| 138 | 20 | Junxiao Shi | |
| 139 | ControlParameters fields: |
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| 140 | |||
| 141 | 43 | Junxiao Shi | * LocalControlFeature (required): 1=IncomingFaceId, 2=NextHopFaceId, 3=CachingPolicy |
| 142 | 26 | Junxiao Shi | |
| 143 | 20 | Junxiao Shi | This command can only operate on the requesting face. |
| 144 | |||
| 145 | 1 | Junxiao Shi | ## Face Dataset |
| 146 | |||
| 147 | 20 | Junxiao Shi | Description and counters of all active faces are published as a [[StatusDataset|Status Dataset]] at `ndn:/localhost/nfd/faces/list`. |
| 148 | 1 | Junxiao Shi | |
| 149 | 32 | Junxiao Shi | Each face is represented by a **FaceStatus** block: |
| 150 | 1 | Junxiao Shi | |
| 151 | 39 | Junxiao Shi | FaceStatus ::= FACE-STATUS-TYPE TLV-LENGTH |
| 152 | FaceId |
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| 153 | Uri (remote FaceUri) |
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| 154 | LocalUri |
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| 155 | ExpirationPeriod? |
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| 156 | 40 | Junxiao Shi | FaceScope |
| 157 | FacePersistency |
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| 158 | LinkType |
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| 159 | 39 | Junxiao Shi | NInInterests |
| 160 | NInDatas |
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| 161 | NOutInterests |
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| 162 | NOutDatas |
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| 163 | NInBytes |
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| 164 | NOutBytes |
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| 165 | 1 | Junxiao Shi | |
| 166 | 39 | Junxiao Shi | LocalUri ::= LOCAL-URI-TYPE TLV-LENGTH |
| 167 | RFC3986 URI in UTF-8 encoding |
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| 168 | 1 | Junxiao Shi | |
| 169 | 40 | Junxiao Shi | FaceScope ::= FACE-SCOPE-TYPE TLV-LENGTH |
| 170 | 39 | Junxiao Shi | nonNegativeInteger |
| 171 | 1 | Junxiao Shi | |
| 172 | 40 | Junxiao Shi | FacePersistency ::= FACE-PERSISTENCY-TYPE TLV-LENGTH |
| 173 | 39 | Junxiao Shi | nonNegativeInteger |
| 174 | 1 | Junxiao Shi | |
| 175 | 40 | Junxiao Shi | LinkType ::= LINK-TYPE-TYPE TLV-LENGTH |
| 176 | 39 | Junxiao Shi | nonNegativeInteger |
| 177 | 20 | Junxiao Shi | |
| 178 | 39 | Junxiao Shi | NInInterests ::= N-IN-INTERESTS-TYPE TLV-LENGTH |
| 179 | nonNegativeInteger |
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| 180 | 1 | Junxiao Shi | |
| 181 | 39 | Junxiao Shi | NInDatas ::= N-IN-DATAS-TYPE TLV-LENGTH |
| 182 | nonNegativeInteger |
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| 183 | 1 | Junxiao Shi | |
| 184 | 39 | Junxiao Shi | NOutInterests ::= N-OUT-INTERESTS-TYPE TLV-LENGTH |
| 185 | nonNegativeInteger |
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| 186 | 37 | Junxiao Shi | |
| 187 | 39 | Junxiao Shi | NOutDatas ::= N-OUT-DATAS-TYPE TLV-LENGTH |
| 188 | nonNegativeInteger |
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| 189 | |||
| 190 | NInBytes ::= N-IN-BYTES-TYPE TLV-LENGTH |
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| 191 | nonNegativeInteger |
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| 192 | |||
| 193 | NOutBytes ::= N-OUT-BYTES-TYPE TLV-LENGTH |
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| 194 | nonNegativeInteger |
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| 195 | 1 | Junxiao Shi | |
| 196 | * **Uri** is a FaceUri representing remote endpoint. |
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| 197 | * **LocalUri** is a FaceUri representing local endpoint. |
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| 198 | * **ExpirationPeriod** is the remaining lifetime of this face. |
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| 199 | If this field is omitted, the face has infinite lifetime. |
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| 200 | Currently, this is applicable to on-demand datagram faces only. |
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| 201 | 40 | Junxiao Shi | * **FaceScope** indicates whether the face is local for [[ScopeControl|scope control]] purposes. |
| 202 | 39 | Junxiao Shi | * non-local(=0) |
| 203 | * local(=1) |
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| 204 | 40 | Junxiao Shi | * **FacePersistency** indicates whether the face is persistent. |
| 205 | * persistent(=0), face remains open until it's explicitly destroyed or there's a transport failure |
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| 206 | * on-demand(=1), face closes if it remains idle for some time |
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| 207 | * permanent(=2), face remains open until it's explicitly destroyed; transport failures will be recovered internally (this level of persistency is not supported currently) |
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| 208 | * **LinkType** indicates the type of communication link |
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| 209 | * point-to-point(=0), communication with one peer |
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| 210 | * multi-access(=1), communication with a multicast group |
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| 211 | 1 | Junxiao Shi | * **NInInterests** is the total number of incoming Interests since the face is established. |
| 212 | 37 | Junxiao Shi | * **NInDatas** is the total number of incoming Datas since the face is established. |
| 213 | * **NOutInterests** is the total number of outgoing Interests since the face is established. |
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| 214 | * **NOutDatas** is the total number of outgoing Datas since the face is established. |
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| 215 | * **NInBytes** counts the number of bytes of link layer packets received via this face. |
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| 216 | 1 | Junxiao Shi | This counter is initialized to zero when the face is established, and can wrap around after overflowing unsigned 64-bit integer range. |
| 217 | * **NOutBytes** counts the number of bytes of link layer packets sent via this face. |
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| 218 | 37 | Junxiao Shi | This counter is initialized to zero when the face is established, and can wrap around after overflowing unsigned 64-bit integer range. |
| 219 | |||
| 220 | ### Query Operation |
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| 221 | |||
| 222 | The query operation allows one to retrieve a subset of face dataset that contains faces satisfying a filter. |
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| 223 | |||
| 224 | To run a query, the consumer should express an Interest with Name: `ndn:/localhost/nfd/faces/query/<filter>`, where `<filter>` is a **FaceQueryFilter** block that specifies zero or more conditions. |
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| 225 | 1 | Junxiao Shi | |
| 226 | 37 | Junxiao Shi | FaceQueryFilter ::= FACE-QUERY-FILTER-TYPE TLV-LENGTH |
| 227 | FaceId? |
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| 228 | UriScheme? |
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| 229 | Uri? |
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| 230 | LocalUri? |
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| 231 | 40 | Junxiao Shi | FaceScope? |
| 232 | FacePersistency? |
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| 233 | LinkType? |
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| 234 | 37 | Junxiao Shi | |
| 235 | UriScheme ::= URI-SCHEME-TYPE TLV-LENGTH |
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| 236 | 1 | Junxiao Shi | string in UTF-8 |
| 237 | 37 | Junxiao Shi | |
| 238 | * **FaceId** permits a face if its FaceId equals the value |
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| 239 | * **UriScheme** permits a face if the scheme part of its local FaceUri or remote FaceUri equals the value |
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| 240 | * **Uri** permits a face if its remote FaceUri equals the value |
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| 241 | * **LocalUri** permits a face if its local FaceUri equals the value |
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| 242 | 40 | Junxiao Shi | * **FaceScope** permits a face if its *FaceScope* attribute equals the value |
| 243 | * **FacePersistency** permits a face if its *FacePersistency* attribute equals the value |
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| 244 | * **LinkType** permits a face if its *LinkType* attribute equals the value |
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| 245 | 1 | Junxiao Shi | |
| 246 | A face must satisfy ALL conditions to satisfy the filter. |
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| 247 | 39 | Junxiao Shi | Faces that satisfy the filter are represented by **FaceStatus** blocks, and published as a [[StatusDataset]] under the Interest Name (a Data packet's Name would be `ndn:/localhost/nfd/faces/query/<filter>/<version>/<segment>`). |
| 248 | 37 | Junxiao Shi | |
| 249 | Examples of filters: |
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| 250 | |||
| 251 | 1 | Junxiao Shi | * a specific face: FaceId=260 |
| 252 | 37 | Junxiao Shi | * a specific TCP tunnel: Uri=tcp4://192.0.2.1:6363 |
| 253 | 41 | Junxiao Shi | note: FaceUri must precisely match the canonical form: use either "tcp4" or "tcp6" instead of "tcp", use IP address instead of DNS name, include port number |
| 254 | 37 | Junxiao Shi | * all TCP tunnels: UriScheme=tcp |
| 255 | 33 | Junxiao Shi | note: "tcp" permits both "tcp4" and "tcp6", "udp" permits both "udp4" and "udp6" |
| 256 | 40 | Junxiao Shi | * all UDP multicast faces: UriScheme=udp & LinkType=multi-access |
| 257 | 33 | Junxiao Shi | * all Ethernet faces: UriScheme=ether |
| 258 | note: UriScheme matches on both local and remote FaceUri, "dev" also works |
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| 259 | * all faces: no condition |
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| 260 | note: this is equivalent to face dataset, and face dataset should be preferred for this purpose |
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| 261 | |||
| 262 | 1 | Junxiao Shi | ## Channel Dataset |
| 263 | |||
| 264 | Description of all active channels is published as a [[StatusDataset|Status Dataset]] at `ndn:/localhost/nfd/faces/channels`. |
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| 265 | 33 | Junxiao Shi | |
| 266 | Each channel is represented by a **ChannelStatus** block: |
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| 267 | |||
| 268 | 20 | Junxiao Shi | ChannelStatus := CHANNEL-STATUS-TYPE TLV-LENGTH |
| 269 | 1 | Junxiao Shi | LocalUri |
| 270 | |||
| 271 | 20 | Junxiao Shi | * **LocalUri** is a FaceUri representing local endpoint. |
| 272 | |||
| 273 | 21 | Alex Afanasyev | ## Face Status Change Notification |
| 274 | 20 | Junxiao Shi | |
| 275 | 1 | Junxiao Shi | Face status change events are published as a [[Notification|Notification Stream]] at `ndn:/localhost/nfd/faces/events`. |
| 276 | 21 | Alex Afanasyev | Notifications of all faces are sent into the same notification stream. |
| 277 | 37 | Junxiao Shi | |
| 278 | The Content of each notification Data packet is a `FaceEventNotification` block: |
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| 279 | |||
| 280 | 1 | Junxiao Shi | FaceEventNotification ::= FACE-EVENT-NOTIFICATION-TYPE TLV-LENGTH |
| 281 | 37 | Junxiao Shi | FaceEventKind |
| 282 | FaceId |
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| 283 | 23 | Alex Afanasyev | Uri |
| 284 | 37 | Junxiao Shi | LocalUri |
| 285 | 40 | Junxiao Shi | FaceScope |
| 286 | FacePersistency |
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| 287 | LinkType |
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| 288 | 25 | Junxiao Shi | |
| 289 | 23 | Alex Afanasyev | FaceEventKind ::= FACE-EVENT-KIND-TYPE TLV-LENGTH |
| 290 | nonNegativeInteger |
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| 291 | 25 | Junxiao Shi | |
| 292 | 23 | Alex Afanasyev | **FaceEventKind** indicates the kind of event. Its possible values are: |
| 293 | 9 | Junxiao Shi | |
| 294 | * **1**: face is created |
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| 295 | * **2**: face is destroyed |
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| 296 | 1 | Junxiao Shi | |
| 297 | 34 | Junxiao Shi | ## TLV-TYPE assignments |
| 298 | 33 | Junxiao Shi | |
| 299 | 32 | Junxiao Shi | Type | Assigned value | Assigned value (hex) |
| 300 | 20 | Junxiao Shi | ------------------------------------------- | ----------------- | -------------------- |
| 301 | FaceStatus | 128 | 0x80 |
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| 302 | LocalUri | 129 | 0x81 |
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| 303 | 39 | Junxiao Shi | ChannelStatus | 130 | 0x82 |
| 304 | 40 | Junxiao Shi | FaceScope | 132 | 0x84 |
| 305 | FacePersistency | 133 | 0x85 |
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| 306 | LinkType | 134 | 0x86 |
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| 307 | 24 | Alex Afanasyev | NInInterests | 144 | 0x90 |
| 308 | 1 | Junxiao Shi | NInDatas | 145 | 0x91 |
| 309 | NOutInterests | 146 | 0x92 |
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| 310 | NOutDatas | 147 | 0x93 |
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| 311 | NInBytes | 148 | 0x94 |
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| 312 | NOutBytes | 149 | 0x95 |
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| 313 | 44 | Junxiao Shi | FaceQueryFilter | 150 | 0x96 |
| 314 | 1 | Junxiao Shi | UriScheme | 131 | 0x83 |
| 315 | FaceEventNotification | 192 | 0xc0 |
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| 316 | FaceEventKind | 193 | 0xc1 |
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| 317 | 39 | Junxiao Shi | (reserved, formerly FaceFlags) | 194 | 0xc2 |