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Improved internal path quality metric computation
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,71 @@ | ||
| /* vim: set expandtab ts=4 sw=4: */ | ||
| /* | ||
| * You may redistribute this program and/or modify it under the terms of | ||
| * the GNU General Public License as published by the Free Software Foundation, | ||
| * either version 3 of the License, or (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| */ | ||
| #ifndef Metric_H | ||
| #define Metric_H | ||
|
|
||
| // This is INTERNAL to cjdns, it does not get used in the protocol at all, | ||
| // but it is an internal protocol which is used to coordinate the different | ||
| // modules. | ||
| // | ||
| // Different parts of the code become aware of the validity of different paths. | ||
| // The InterfaceController becomes aware of peers, the DHT and the subnode | ||
| // Pathfinder become aware of more distant nodes. And of course the SessionManager | ||
| // becomes aware of a node by virtue of communicating with it. | ||
| // | ||
| // Each of these components informs the SessionManager when it becomes aware | ||
| // of a path, if the SessionManager has a session for the node and the metric | ||
| // for the path is lower than the metric which the SessionManager currently | ||
| // has, it will update the path to that node. | ||
| // | ||
| // Because this is not inter-node protocol, you can change these numbers at any | ||
| // time. | ||
|
|
||
| enum Metric { | ||
| // This is known to be a peer by InterfaceController, OR'd with the latency | ||
| Metric_IC_PEER = 0xff000000, | ||
| Metric_IC_PEER_MASK = 0x0000ffff, | ||
|
|
||
| // Node is a direct peer according to the SubnodePathfinder | ||
| Metric_PF_PEER = 0xff100000, | ||
|
|
||
| // The snode says this is a path to the node | ||
| Metric_SNODE_SAYS = 0xff200000, | ||
|
|
||
| // This is our discovered path to our snode | ||
| Metric_SNODE = 0xff300000, | ||
|
|
||
| // Node is a direct peer according to the (dht) Pathfinder | ||
| Metric_DHT_PEER = 0xff400000, | ||
|
|
||
| // We sent a ping to a node to complete the session setup, it replied. | ||
| // This is a path which we know works, but we don't know if it's any good. | ||
| Metric_PING_REPLY = 0xff500000, | ||
| Metric_DHT_INCOMING = 0xff510000, | ||
|
|
||
| // Anything that comes from the DHT Pathfinder is &'d with Metric_DHT_MASK | ||
| // and OR'd with Metric_DHT. | ||
| Metric_DHT = 0xff600000, | ||
| Metric_DHT_MASK = 0x000fffff, | ||
|
|
||
| // Incoming message, CryptoAuth has not yet checked that the key is real | ||
| Metric_SM_INCOMING = 0xff700000, | ||
| // Outgoing message, some upper layer thinks this is the path | ||
| Metric_SM_SEND = 0xff710000, | ||
|
|
||
| // This will cause the SM to kill off a path | ||
| Metric_DEAD_LINK = 0xffffffff | ||
| }; | ||
|
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||
| #endif |