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22 * @file mesh/gnunet-service-mesh_tunnel.h
23 * @brief mesh service; dealing with tunnels and crypto
24 * @author Bartlomiej Polot
26 * All functions in this file should use the prefix GMT (Gnunet Mesh Tunnel)
29 #ifndef GNUNET_SERVICE_MESH_TUNNEL_H
30 #define GNUNET_SERVICE_MESH_TUNNEL_H
35 #if 0 /* keep Emacsens' auto-indent happy */
41 #include "gnunet_util_lib.h"
44 * All the states a tunnel can be in.
49 * Uninitialized status, should never appear in operation.
54 * Path to the peer not known yet.
56 MESH_TUNNEL3_SEARCHING,
59 * Request sent, not yet answered.
64 * Ephemeral key sent, waiting for peer's key.
66 MESH_TUNNEL3_KEY_SENT,
69 * Have peer's key, sent ping, waiting for pong.
71 MESH_TUNNEL3_PING_SENT,
74 * Peer connected and ready to accept data.
79 * Peer connected previosly but not responding.
81 MESH_TUNNEL3_RECONNECTING,
84 * New ephemeral key and ping sent, waiting for pong.
90 * Struct containing all information regarding a given peer
95 #include "gnunet-service-mesh_channel.h"
96 #include "gnunet-service-mesh_connection.h"
97 #include "gnunet-service-mesh_peer.h"
99 struct MeshTunnel3Queue;
102 * Callback called when a queued message is sent.
104 * @param cls Closure.
105 * @param t Tunnel this message was on.
106 * @param type Type of message sent.
107 * @param fwd Was this a FWD going message?
108 * @param size Size of the message.
110 typedef void (*GMT_sent) (void *cls,
111 struct MeshTunnel3 *t,
112 struct MeshTunnel3Queue *q,
113 uint16_t type, int fwd, size_t size);
116 /******************************************************************************/
117 /******************************** API ***********************************/
118 /******************************************************************************/
121 * Initialize tunnel subsystem.
123 * @param c Configuration handle.
124 * @param key ECC private key, to derive all other keys and do crypto.
127 GMT_init (const struct GNUNET_CONFIGURATION_Handle *c,
128 const struct GNUNET_CRYPTO_EddsaPrivateKey *key);
131 * Shut down the tunnel subsystem.
139 * @param destination Peer this tunnel is towards.
142 GMT_new (struct MeshPeer *destination);
145 * Tunnel is empty: destroy it.
147 * Notifies all connections about the destruction.
149 * @param t Tunnel to destroy.
152 GMT_destroy_empty (struct MeshTunnel3 *t);
155 * Destroy tunnel if empty (no more channels).
157 * @param t Tunnel to destroy if empty.
160 GMT_destroy_if_empty (struct MeshTunnel3 *t);
163 * Destroy the tunnel.
165 * This function does not generate any warning traffic to clients or peers.
168 * Cancel messages belonging to this tunnel queued to neighbors.
169 * Free any allocated resources linked to the tunnel.
171 * @param t The tunnel to destroy.
174 GMT_destroy (struct MeshTunnel3 *t);
177 * Change the tunnel state.
179 * @param t Tunnel whose state to change.
180 * @param state New state.
183 GMT_change_state (struct MeshTunnel3* t, enum MeshTunnel3State state);
186 * Add a connection to a tunnel.
189 * @param c Connection.
192 GMT_add_connection (struct MeshTunnel3 *t, struct MeshConnection *c);
195 * Remove a connection from a tunnel.
198 * @param c Connection.
201 GMT_remove_connection (struct MeshTunnel3 *t, struct MeshConnection *c);
204 * Add a channel to a tunnel.
210 GMT_add_channel (struct MeshTunnel3 *t, struct MeshChannel *ch);
213 * Remove a channel from a tunnel.
219 GMT_remove_channel (struct MeshTunnel3 *t, struct MeshChannel *ch);
222 * Search for a channel by global ID.
224 * @param t Tunnel containing the channel.
225 * @param chid Public channel number.
227 * @return channel handler, NULL if doesn't exist
230 GMT_get_channel (struct MeshTunnel3 *t, MESH_ChannelNumber chid);
233 * Decrypt and demultiplex by message type. Call appropriate handler
235 * towards a channel of a local tunnel.
237 * @param t Tunnel this message came on.
238 * @param msg Message header.
241 GMT_handle_encrypted (struct MeshTunnel3 *t,
242 const struct GNUNET_MESH_Encrypted *msg);
245 * Demultiplex an encapsulated KX message by message type.
247 * @param t Tunnel on which the message came.
248 * @param message KX message itself.
251 GMT_handle_kx (struct MeshTunnel3 *t,
252 const struct GNUNET_MessageHeader *message);
255 * @brief Use the given path for the tunnel.
256 * Update the next and prev hops (and RCs).
257 * (Re)start the path refresh in case the tunnel is locally owned.
259 * @param t Tunnel to update.
260 * @param p Path to use.
262 * @return Connection created.
264 struct MeshConnection *
265 GMT_use_path (struct MeshTunnel3 *t, struct MeshPeerPath *p);
268 * Count established (ready) connections of a tunnel.
270 * @param t Tunnel on which to count.
272 * @return Number of connections.
275 GMT_count_connections (struct MeshTunnel3 *t);
278 * Count channels of a tunnel.
280 * @param t Tunnel on which to count.
282 * @return Number of channels.
285 GMT_count_channels (struct MeshTunnel3 *t);
288 * Get the state of a tunnel.
292 * @return Tunnel's state.
294 enum MeshTunnel3State
295 GMT_get_state (struct MeshTunnel3 *t);
298 * Get the maximum buffer space for a tunnel towards a local client.
302 * @return Biggest buffer space offered by any channel in the tunnel.
305 GMT_get_channels_buffer (struct MeshTunnel3 *t);
308 * Get the total buffer space for a tunnel for P2P traffic.
312 * @return Buffer space offered by all connections in the tunnel.
315 GMT_get_connections_buffer (struct MeshTunnel3 *t);
318 * Get the tunnel's destination.
322 * @return ID of the destination peer.
324 const struct GNUNET_PeerIdentity *
325 GMT_get_destination (struct MeshTunnel3 *t);
328 * Get the tunnel's next free Channel ID.
332 * @return ID of a channel free to use.
335 GMT_get_next_chid (struct MeshTunnel3 *t);
338 * Send ACK on one or more channels due to buffer in connections.
340 * @param t Channel which has some free buffer space.
343 GMT_unchoke_channels (struct MeshTunnel3 *t);
346 * Send ACK on one or more connections due to buffer space to the client.
348 * Iterates all connections of the tunnel and sends ACKs appropriately.
350 * @param t Tunnel which has some free buffer space.
353 GMT_send_connection_acks (struct MeshTunnel3 *t);
356 * Sends an already built message on a tunnel, encrypting it and
357 * choosing the best connection.
359 * @param message Message to send. Function modifies it.
360 * @param t Tunnel on which this message is transmitted.
361 * @param ch Channel on which this message is transmitted.
362 * @param fwd Is this a fwd message on @c ch?
365 GMT_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
366 struct MeshTunnel3 *t,
367 struct MeshChannel *ch,
371 * Is the tunnel directed towards the local peer?
375 * @return #GNUNET_YES if it is loopback.
378 GMT_is_loopback (const struct MeshTunnel3 *t);
381 * Is the tunnel using this path already?
386 * @return #GNUNET_YES a connection uses this path.
389 GMT_is_path_used (const struct MeshTunnel3 *t, const struct MeshPeerPath *p);
392 * Get a cost of a path for a tunnel considering existing connections.
395 * @param path Candidate path.
397 * @return Cost of the path (path length + number of overlapping nodes)
400 GMT_get_path_cost (const struct MeshTunnel3 *t,
401 const struct MeshPeerPath *path);
404 * Get the static string for the peer this tunnel is directed.
408 * @return Static string the destination peer's ID.
411 GMT_2s (const struct MeshTunnel3 *t);
413 #if 0 /* keep Emacsens' auto-indent happy */
420 /* ifndef GNUNET_MESH_SERVICE_TUNNEL_H */
422 /* end of gnunet-mesh-service_tunnel.h */