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3 (C) 2013 Christian Grothoff (and other contributing authors)
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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"
100 /******************************************************************************/
101 /******************************** API ***********************************/
102 /******************************************************************************/
105 * Initialize tunnel subsystem.
107 * @param c Configuration handle.
108 * @param key ECC private key, to derive all other keys and do crypto.
111 GMT_init (const struct GNUNET_CONFIGURATION_Handle *c,
112 const struct GNUNET_CRYPTO_EddsaPrivateKey *key);
115 * Shut down the tunnel subsystem.
123 * @param destination Peer this tunnel is towards.
126 GMT_new (struct MeshPeer *destination);
129 * Tunnel is empty: destroy it.
131 * Notifies all connections about the destruction.
133 * @param t Tunnel to destroy.
136 GMT_destroy_empty (struct MeshTunnel3 *t);
139 * Destroy tunnel if empty (no more channels).
141 * @param t Tunnel to destroy if empty.
144 GMT_destroy_if_empty (struct MeshTunnel3 *t);
147 * Destroy the tunnel.
149 * This function does not generate any warning traffic to clients or peers.
152 * Cancel messages belonging to this tunnel queued to neighbors.
153 * Free any allocated resources linked to the tunnel.
155 * @param t The tunnel to destroy.
158 GMT_destroy (struct MeshTunnel3 *t);
161 * Change the tunnel state.
163 * @param t Tunnel whose state to change.
164 * @param state New state.
167 GMT_change_state (struct MeshTunnel3* t, enum MeshTunnel3State state);
170 * Add a connection to a tunnel.
173 * @param c Connection.
176 GMT_add_connection (struct MeshTunnel3 *t, struct MeshConnection *c);
179 * Remove a connection from a tunnel.
182 * @param c Connection.
185 GMT_remove_connection (struct MeshTunnel3 *t, struct MeshConnection *c);
188 * Add a channel to a tunnel.
194 GMT_add_channel (struct MeshTunnel3 *t, struct MeshChannel *ch);
197 * Remove a channel from a tunnel.
203 GMT_remove_channel (struct MeshTunnel3 *t, struct MeshChannel *ch);
206 * Search for a channel by global ID.
208 * @param t Tunnel containing the channel.
209 * @param chid Public channel number.
211 * @return channel handler, NULL if doesn't exist
214 GMT_get_channel (struct MeshTunnel3 *t, MESH_ChannelNumber chid);
217 * Decrypt and demultiplex by message type. Call appropriate handler
219 * towards a channel of a local tunnel.
221 * @param t Tunnel this message came on.
222 * @param msg Message header.
225 GMT_handle_encrypted (struct MeshTunnel3 *t,
226 const struct GNUNET_MESH_Encrypted *msg);
229 * Demultiplex an encapsulated KX message by message type.
231 * @param t Tunnel on which the message came.
232 * @param message KX message itself.
235 GMT_handle_kx (struct MeshTunnel3 *t,
236 const struct GNUNET_MessageHeader *message);
239 * @brief Use the given path for the tunnel.
240 * Update the next and prev hops (and RCs).
241 * (Re)start the path refresh in case the tunnel is locally owned.
243 * @param t Tunnel to update.
244 * @param p Path to use.
246 * @return Connection created.
248 struct MeshConnection *
249 GMT_use_path (struct MeshTunnel3 *t, struct MeshPeerPath *p);
252 * Count established (ready) connections of a tunnel.
254 * @param t Tunnel on which to count.
256 * @return Number of connections.
259 GMT_count_connections (struct MeshTunnel3 *t);
262 * Count channels of a tunnel.
264 * @param t Tunnel on which to count.
266 * @return Number of channels.
269 GMT_count_channels (struct MeshTunnel3 *t);
272 * Get the state of a tunnel.
276 * @return Tunnel's state.
278 enum MeshTunnel3State
279 GMT_get_state (struct MeshTunnel3 *t);
282 * Get the maximum buffer space for a tunnel towards a local client.
286 * @return Biggest buffer space offered by any channel in the tunnel.
289 GMT_get_channels_buffer (struct MeshTunnel3 *t);
292 * Get the total buffer space for a tunnel for P2P traffic.
296 * @return Buffer space offered by all connections in the tunnel.
299 GMT_get_connections_buffer (struct MeshTunnel3 *t);
302 * Get the tunnel's destination.
306 * @return ID of the destination peer.
308 const struct GNUNET_PeerIdentity *
309 GMT_get_destination (struct MeshTunnel3 *t);
312 * Get the tunnel's next free Channel ID.
316 * @return ID of a channel free to use.
319 GMT_get_next_chid (struct MeshTunnel3 *t);
322 * Send ACK on one or more channels due to buffer in connections.
324 * @param t Channel which has some free buffer space.
327 GMT_unchoke_channels (struct MeshTunnel3 *t);
330 * Send ACK on one or more connections due to buffer space to the client.
332 * Iterates all connections of the tunnel and sends ACKs appropriately.
334 * @param t Tunnel which has some free buffer space.
337 GMT_send_connection_acks (struct MeshTunnel3 *t);
340 * Sends an already built message on a tunnel, encrypting it and
341 * choosing the best connection.
343 * @param message Message to send. Function modifies it.
344 * @param t Tunnel on which this message is transmitted.
345 * @param ch Channel on which this message is transmitted.
346 * @param fwd Is this a fwd message on @c ch?
349 GMT_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
350 struct MeshTunnel3 *t,
351 struct MeshChannel *ch,
355 * Is the tunnel directed towards the local peer?
359 * @return #GNUNET_YES if it is loopback.
362 GMT_is_loopback (const struct MeshTunnel3 *t);
365 * Is the tunnel using this path already?
370 * @return #GNUNET_YES a connection uses this path.
373 GMT_is_path_used (const struct MeshTunnel3 *t, const struct MeshPeerPath *p);
376 * Get a cost of a path for a tunnel considering existing connections.
379 * @param path Candidate path.
381 * @return Cost of the path (path length + number of overlapping nodes)
384 GMT_get_path_cost (const struct MeshTunnel3 *t,
385 const struct MeshPeerPath *path);
388 * Get the static string for the peer this tunnel is directed.
392 * @return Static string the destination peer's ID.
395 GMT_2s (const struct MeshTunnel3 *t);
397 #if 0 /* keep Emacsens' auto-indent happy */
404 /* ifndef GNUNET_MESH_SERVICE_TUNNEL_H */
406 /* end of gnunet-mesh-service_tunnel.h */