2 This file is part of GNUnet.
3 (C) 2001-2013 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 * @file mesh/gnunet-service-mesh-enc.c
23 * @brief GNUnet MESH service with encryption
24 * @author Bartlomiej Polot
27 * - when sending in-order buffered data, wait for client ACKs
32 * - relay corking down to core
33 * - set ttl relative to path length
37 * - peer: other mesh instance. If there is direct connection it's a neighbor.
38 * - tunnel: encrypted connection to a peer, neighbor or not.
39 * - channel: connection between two clients, on the same or different peers.
40 * have properties like reliability.
41 * - path: series of directly connected peer from one peer to another.
42 * - connection: path which is being used in a tunnel.
46 #include "gnunet_crypto_lib.h"
48 #include "mesh_protocol_enc.h"
49 #include "mesh_path.h"
50 #include "block_mesh.h"
51 #include "gnunet_dht_service.h"
52 #include "gnunet_statistics_service.h"
54 #define MESH_BLOOM_SIZE 128
56 #define MESH_DEBUG_DHT GNUNET_NO
57 #define MESH_DEBUG_CONNECTION GNUNET_NO
58 #define MESH_DEBUG_TIMING __LINUX__ && GNUNET_NO
60 #define MESH_MAX_POLL_TIME GNUNET_TIME_relative_multiply (\
61 GNUNET_TIME_UNIT_MINUTES,\
63 #define MESH_RETRANSMIT_TIME GNUNET_TIME_UNIT_SECONDS
64 #define MESH_RETRANSMIT_MARGIN 4
66 #if MESH_DEBUG_CONNECTION
67 #define DEBUG_CONN(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
69 #define DEBUG_CONN(...)
73 #define DEBUG_DHT(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
75 #define DEBUG_DHT(...)
82 struct timespec __mesh_start;
83 struct timespec __mesh_end;
84 #define INTERVAL_START clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_start))
85 #define INTERVAL_END \
87 clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_end));\
88 double __diff = __mesh_end.tv_nsec - __mesh_start.tv_nsec;\
89 if (__diff < 0) __diff += 1000000000;\
93 #define INTERVAL_SHOW \
95 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "AVG process time: %f ns\n", __sum/__count)
97 #define INTERVAL_START
103 * All the states a tunnel can be in.
108 * Uninitialized status, should never appear in operation.
113 * Path to the peer not known yet
115 MESH_TUNNEL_SEARCHING,
118 * Request sent, not yet answered.
123 * Peer connected and ready to accept data
128 * Peer connected previosly but not responding
130 MESH_TUNNEL_RECONNECTING
135 * All the states a connection can be in.
137 enum MeshConnectionState
140 * Uninitialized status, should never appear in operation.
145 * Connection created, waiting for ACK.
147 MESH_CONNECTION_SENT,
150 * Connection confirmed, ready to carry traffic..
152 MESH_CONNECTION_READY,
156 /******************************************************************************/
157 /************************ DATA STRUCTURES ****************************/
158 /******************************************************************************/
160 /** FWD declaration */
164 struct MeshConnection;
166 struct MeshChannelReliability;
170 * Struct containing info about a queued transmission to this peer
177 struct MeshPeerQueue *next;
182 struct MeshPeerQueue *prev;
185 * Peer this transmission is directed to.
187 struct MeshPeer *peer;
190 * Connection this message belongs to.
192 struct MeshConnection *c;
200 * Channel this message belongs to, if known.
202 struct MeshChannel *ch;
205 * Pointer to info stucture used as cls.
215 * Size of the message
222 * Struct to encapsulate all the Flow Control information to a peer to which
223 * we are directly connected (on a core level).
225 struct MeshFlowControl
228 * Connection this controls.
230 struct MeshConnection *c;
233 * How many messages are in the queue on this connection.
235 unsigned int queue_n;
238 * How many messages do we accept in the queue.
240 unsigned int queue_max;
243 * ID of the last packet sent towards the peer.
245 uint32_t last_pid_sent;
248 * ID of the last packet received from the peer.
250 uint32_t last_pid_recv;
253 * Last ACK sent to the peer (peer can't send more than this PID).
255 uint32_t last_ack_sent;
258 * Last ACK sent towards the origin (for traffic towards leaf node).
260 uint32_t last_ack_recv;
263 * Task to poll the peer in case of a lost ACK causes stall.
265 GNUNET_SCHEDULER_TaskIdentifier poll_task;
268 * How frequently to poll for ACKs.
270 struct GNUNET_TIME_Relative poll_time;
275 * Struct containing all information regarding a given peer
285 * Last time we heard from this peer
287 struct GNUNET_TIME_Absolute last_contact;
290 * Paths to reach the peer, ordered by ascending hop count
292 struct MeshPeerPath *path_head;
295 * Paths to reach the peer, ordered by ascending hop count
297 struct MeshPeerPath *path_tail;
300 * Handle to stop the DHT search for paths to this peer
302 struct GNUNET_DHT_GetHandle *dhtget;
305 * Tunnel to this peer, if any.
307 struct MeshTunnel2 *tunnel;
310 * Connections that go through this peer, indexed by tid;
312 struct GNUNET_CONTAINER_MultiHashMap *connections;
315 * Handle for queued transmissions
317 struct GNUNET_CORE_TransmitHandle *core_transmit;
320 * Transmission queue to core DLL head
322 struct MeshPeerQueue *queue_head;
325 * Transmission queue to core DLL tail
327 struct MeshPeerQueue *queue_tail;
330 * How many messages are in the queue to this peer.
332 unsigned int queue_n;
337 * Info needed to retry a message in case it gets lost.
339 struct MeshReliableMessage
342 * Double linked list, FIFO style
344 struct MeshReliableMessage *next;
345 struct MeshReliableMessage *prev;
348 * Tunnel Reliability queue this message is in.
350 struct MeshChannelReliability *rel;
353 * ID of the message (ACK needed to free)
358 * When was this message issued (to calculate ACK delay)
360 struct GNUNET_TIME_Absolute timestamp;
362 /* struct GNUNET_MESH_Data with payload */
366 struct MeshChannelReliability
369 * Channel this is about.
371 struct MeshChannel *ch;
374 * DLL of messages sent and not yet ACK'd.
376 struct MeshReliableMessage *head_sent;
377 struct MeshReliableMessage *tail_sent;
380 * Messages pending to send.
385 * DLL of messages received out of order.
387 struct MeshReliableMessage *head_recv;
388 struct MeshReliableMessage *tail_recv;
396 * Can we send data to the client?
401 * Task to resend/poll in case no ACK is received.
403 GNUNET_SCHEDULER_TaskIdentifier retry_task;
406 * Counter for exponential backoff.
408 struct GNUNET_TIME_Relative retry_timer;
411 * How long does it usually take to get an ACK.
413 struct GNUNET_TIME_Relative expected_delay;
418 * Struct containing all information regarding a channel to a remote client.
423 * Tunnel this channel is in.
425 struct MeshTunnel2 *t;
428 * Double linked list.
430 struct MeshChannel *next;
431 struct MeshChannel *prev;
434 * Destination port of the channel.
439 * Global channel number ( < GNUNET_MESH_LOCAL_CHANNEL_ID_CLI)
441 MESH_ChannelNumber gid;
444 * Local tunnel number for root (owner) client.
445 * ( >= GNUNET_MESH_LOCAL_CHANNEL_ID_CLI or 0 )
447 MESH_ChannelNumber lid_root;
450 * Local tunnel number for local destination clients (incoming number)
451 * ( >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV or 0).
453 MESH_ChannelNumber lid_dest;
456 * Next MID to use for fwd traffic.
458 uint32_t mid_send_fwd;
461 * Next MID expected for fwd traffic.
463 uint32_t mid_recv_fwd;
466 * Next MID to use for bck traffic.
468 uint32_t mid_send_bck;
471 * Next MID expected for bck traffic.
473 uint32_t mid_recv_bck;
476 * Is the tunnel bufferless (minimum latency)?
481 * Is the tunnel reliable?
486 * Last time the channel was used
488 struct GNUNET_TIME_Absolute timestamp;
491 * Client owner of the tunnel, if any
493 struct MeshClient *root;
496 * Client destination of the tunnel, if any.
498 struct MeshClient *dest;
501 * Flag to signal the destruction of the channel.
502 * If this is set GNUNET_YES the channel will be destroyed
503 * when the queue is empty.
508 * Total messages pending for this channel, payload or not.
510 unsigned int pending_messages;
514 * Only present (non-NULL) at the owner of a tunnel.
516 struct MeshChannelReliability *fwd_rel;
520 * Only present (non-NULL) at the destination of a tunnel.
522 struct MeshChannelReliability *bck_rel;
527 * Struct containing all information regarding a connection to a peer.
529 struct MeshConnection
534 struct MeshConnection *next;
535 struct MeshConnection *prev;
538 * Tunnel this connection is part of.
540 struct MeshTunnel2 *t;
543 * Flow control information for traffic fwd.
545 struct MeshFlowControl fwd_fc;
548 * Flow control information for traffic bck.
550 struct MeshFlowControl bck_fc;
558 * State of the connection.
560 enum MeshConnectionState state;
563 * Path being used for the tunnel.
565 struct MeshPeerPath *path;
568 * Position of the local peer in the path.
570 unsigned int own_pos;
573 * Task to keep the used paths alive at the owner,
574 * time tunnel out on all the other peers.
576 GNUNET_SCHEDULER_TaskIdentifier fwd_maintenance_task;
579 * Task to keep the used paths alive at the destination,
580 * time tunnel out on all the other peers.
582 GNUNET_SCHEDULER_TaskIdentifier bck_maintenance_task;
585 * Pending message count.
587 int pending_messages;
590 * Destroy flag: if true, destroy on last message.
597 * Struct used to queue messages in a tunnel.
599 struct MeshTunnelQueue
604 struct MeshTunnelQueue *next;
605 struct MeshTunnelQueue *prev;
610 struct MeshChannel *ch;
615 /* struct GNUNET_MessageHeader *msg; */
620 * Struct containing all information regarding a tunnel to a peer.
625 * Endpoint of the tunnel.
627 struct MeshPeer *peer;
632 struct GNUNET_HashCode id;
635 * State of the tunnel.
637 enum MeshTunnelState state;
640 * Local peer ephemeral private key
642 struct GNUNET_CRYPTO_EccPrivateKey *my_eph_key;
645 * Local peer ephemeral public key
647 struct GNUNET_CRYPTO_EccPublicKey *my_eph;
650 * Remote peer's public key.
652 struct GNUNET_CRYPTO_EccPublicKey *peers_eph;
655 * Encryption ("our") key.
657 struct GNUNET_CRYPTO_AesSessionKey e_key;
660 * Decryption ("their") key.
662 struct GNUNET_CRYPTO_AesSessionKey d_key;
665 * Paths that are actively used to reach the destination peer.
667 struct MeshConnection *connection_head;
668 struct MeshConnection *connection_tail;
671 * Next connection number.
676 * Channels inside this tunnel.
678 struct MeshChannel *channel_head;
679 struct MeshChannel *channel_tail;
682 * Channel ID for the next created channel.
684 MESH_ChannelNumber next_chid;
687 * Channel ID for the next incoming channel.
689 MESH_ChannelNumber next_local_chid;
692 * Pending message count.
694 int pending_messages;
697 * Destroy flag: if true, destroy on last message.
702 * Queued messages, to transmit once tunnel gets connected.
704 struct MeshTunnelQueue *tq_head;
705 struct MeshTunnelQueue *tq_tail;
711 * Struct containing information about a client of the service
713 * TODO: add a list of 'waiting' ports
720 struct MeshClient *next;
725 struct MeshClient *prev;
728 * Tunnels that belong to this client, indexed by local id
730 struct GNUNET_CONTAINER_MultiHashMap32 *own_channels;
733 * Tunnels this client has accepted, indexed by incoming local id
735 struct GNUNET_CONTAINER_MultiHashMap32 *incoming_channels;
738 * Handle to communicate with the client
740 struct GNUNET_SERVER_Client *handle;
743 * Ports that this client has declared interest in.
744 * Indexed by port, contains *Client.
746 struct GNUNET_CONTAINER_MultiHashMap32 *ports;
749 * Whether the client is active or shutting down (don't send confirmations
750 * to a client that is shutting down.
755 * ID of the client, mainly for debug messages
761 /******************************************************************************/
762 /************************ DEBUG FUNCTIONS ****************************/
763 /******************************************************************************/
767 * GNUNET_SCHEDULER_Task for printing a message after some operation is done
768 * @param cls string to print
769 * @param success GNUNET_OK if the PUT was transmitted,
770 * GNUNET_NO on timeout,
771 * GNUNET_SYSERR on disconnect from service
772 * after the PUT message was transmitted
773 * (so we don't know if it was received or not)
778 mesh_debug (void *cls, int success)
782 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%s (%d)\n", s, success);
788 /******************************************************************************/
789 /*********************** GLOBAL VARIABLES ****************************/
790 /******************************************************************************/
792 /************************** Configuration parameters **************************/
795 * How often to send path keepalives. Paths timeout after 4 missed.
797 static struct GNUNET_TIME_Relative refresh_connection_time;
800 * How often to PUT own ID in the DHT.
802 static struct GNUNET_TIME_Relative id_announce_time;
805 * Maximum time allowed to connect to a peer found by string.
807 static struct GNUNET_TIME_Relative connect_timeout;
810 * Default TTL for payload packets.
812 static unsigned long long default_ttl;
815 * DHT replication level, see DHT API: GNUNET_DHT_get_start, GNUNET_DHT_put.
817 static unsigned long long dht_replication_level;
820 * How many connections are we willing to maintain.
821 * Local connections are always allowed, even if there are more connections than max.
823 static unsigned long long max_connections;
826 * How many messages *in total* are we willing to queue, divided by number of
827 * connections to get tunnel queue size.
829 static unsigned long long max_msgs_queue;
832 * How many peers do we want to remember?
834 static unsigned long long max_peers;
837 * Percentage of messages that will be dropped (for test purposes only).
839 static unsigned long long drop_percent;
841 /*************************** Static global variables **************************/
844 * DLL with all the clients, head.
846 static struct MeshClient *clients_head;
849 * DLL with all the clients, tail.
851 static struct MeshClient *clients_tail;
854 * Tunnels known, indexed by MESH_TunnelID (MeshTunnel).
856 static struct GNUNET_CONTAINER_MultiHashMap *tunnels;
859 * Peers known, indexed by PeerIdentity (MeshPeer).
861 static struct GNUNET_CONTAINER_MultiHashMap *peers;
864 * Handle to communicate with core.
866 static struct GNUNET_CORE_Handle *core_handle;
871 static struct GNUNET_DHT_Handle *dht_handle;
874 * Handle to server lib.
876 static struct GNUNET_SERVER_Handle *server_handle;
879 * Handle to the statistics service.
881 static struct GNUNET_STATISTICS_Handle *stats;
884 * Notification context, to send messages to local clients.
886 static struct GNUNET_SERVER_NotificationContext *nc;
889 * Local peer own ID (memory efficient handle).
891 static GNUNET_PEER_Id myid;
894 * Local peer own ID (full value).
896 static struct GNUNET_PeerIdentity my_full_id;
901 static struct GNUNET_CRYPTO_EccPrivateKey *my_private_key;
906 static struct GNUNET_CRYPTO_EccPublicKey my_public_key;
909 * All ports clients of this peer have opened.
911 static struct GNUNET_CONTAINER_MultiHashMap32 *ports;
914 * Task to periodically announce itself in the network.
916 GNUNET_SCHEDULER_TaskIdentifier announce_id_task;
919 * Next ID to assign to a client.
921 unsigned int next_client_id;
924 /******************************************************************************/
925 /*********************** DECLARATIONS **************************/
926 /******************************************************************************/
929 * Function to process paths received for a new peer addition. The recorded
930 * paths form the initial tunnel, which can be optimized later.
931 * Called on each result obtained for the DHT search.
934 * @param exp when will this value expire
935 * @param key key of the result
936 * @param type type of the result
937 * @param size number of bytes in data
938 * @param data pointer to the result data
941 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
942 const struct GNUNET_HashCode * key,
943 const struct GNUNET_PeerIdentity *get_path,
944 unsigned int get_path_length,
945 const struct GNUNET_PeerIdentity *put_path,
946 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
947 size_t size, const void *data);
951 * Retrieve the MeshPeer stucture associated with the peer, create one
952 * and insert it in the appropriate structures if the peer is not known yet.
954 * @param peer Full identity of the peer.
956 * @return Existing or newly created peer info.
958 static struct MeshPeer *
959 peer_get (const struct GNUNET_PeerIdentity *peer);
963 * Retrieve the MeshPeer stucture associated with the peer, create one
964 * and insert it in the appropriate structures if the peer is not known yet.
966 * @param peer Short identity of the peer.
968 * @return Existing or newly created peer info.
970 static struct MeshPeer *
971 peer_get_short (const GNUNET_PEER_Id peer);
975 * Build a PeerPath from the paths returned from the DHT, reversing the paths
976 * to obtain a local peer -> destination path and interning the peer ids.
978 * @return Newly allocated and created path
980 static struct MeshPeerPath *
981 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
982 unsigned int get_path_length,
983 const struct GNUNET_PeerIdentity *put_path,
984 unsigned int put_path_length);
988 * Adds a path to the data structs of all the peers in the path
990 * @param p Path to process.
991 * @param confirmed Whether we know if the path works or not.
994 path_add_to_peers (struct MeshPeerPath *p, int confirmed);
998 * Search for a tunnel by global ID using full PeerIdentities.
1000 * @param t Tunnel containing the channel.
1001 * @param chid Public channel number.
1003 * @return channel handler, NULL if doesn't exist
1005 static struct MeshChannel *
1006 channel_get (struct MeshTunnel2 *t, MESH_ChannelNumber chid);
1010 * Change the tunnel state.
1012 * @param t Tunnel whose state to change.
1013 * @param state New state.
1016 tunnel_change_state (struct MeshTunnel2 *t, enum MeshTunnelState state);
1020 * Notify a tunnel that a connection has broken that affects at least
1021 * some of its peers.
1023 * @param t Tunnel affected.
1024 * @param p1 Peer that got disconnected from p2.
1025 * @param p2 Peer that got disconnected from p1.
1027 * @return Short ID of the peer disconnected (either p1 or p2).
1028 * 0 if the tunnel remained unaffected.
1030 static GNUNET_PEER_Id
1031 tunnel_notify_connection_broken (struct MeshTunnel2 *t,
1032 GNUNET_PEER_Id p1, GNUNET_PEER_Id p2);
1035 * @brief Use the given path for the tunnel.
1036 * Update the next and prev hops (and RCs).
1037 * (Re)start the path refresh in case the tunnel is locally owned.
1039 * @param t Tunnel to update.
1040 * @param p Path to use.
1042 * @return Connection created.
1044 static struct MeshConnection *
1045 tunnel_use_path (struct MeshTunnel2 *t, struct MeshPeerPath *p);
1048 * Tunnel is empty: destroy it.
1050 * Notifies all participants (peers, cleints) about the destruction.
1052 * @param t Tunnel to destroy.
1055 tunnel_destroy_empty (struct MeshTunnel2 *t);
1058 * Destroy the tunnel.
1060 * This function does not generate any warning traffic to clients or peers.
1063 * Cancel messages belonging to this tunnel queued to neighbors.
1064 * Free any allocated resources linked to the tunnel.
1066 * @param t The tunnel to destroy.
1069 tunnel_destroy (struct MeshTunnel2 *t);
1072 * Create a connection.
1074 * @param tid Tunnel ID.
1075 * @param cid Connection ID.
1077 static struct MeshConnection *
1078 connection_new (struct GNUNET_HashCode *tid, uint32_t cid);
1081 * Connection is no longer needed: destroy it and remove from tunnel.
1083 * @param c Connection to destroy.
1086 connection_destroy (struct MeshConnection *c);
1089 * Send FWD keepalive packets for a connection.
1091 * @param cls Closure (connection for which to send the keepalive).
1092 * @param tc Notification context.
1095 connection_fwd_keepalive (void *cls,
1096 const struct GNUNET_SCHEDULER_TaskContext *tc);
1099 * Send BCK keepalive packets for a connection.
1101 * @param cls Closure (connection for which to send the keepalive).
1102 * @param tc Notification context.
1105 connection_bck_keepalive (void *cls,
1106 const struct GNUNET_SCHEDULER_TaskContext *tc);
1110 * Change the tunnel state.
1112 * @param c Connection whose state to change.
1113 * @param state New state.
1116 connection_change_state (struct MeshConnection* c,
1117 enum MeshConnectionState state);
1122 * @brief Queue and pass message to core when possible.
1124 * @param cls Closure (@c type dependant). It will be used by queue_send to
1125 * build the message to be sent if not already prebuilt.
1126 * @param type Type of the message, 0 for a raw message.
1127 * @param size Size of the message.
1128 * @param dst Neighbor to send message to.
1129 * @param c Connection this message belongs to, if any.
1130 * @param ch Channel this message belongs to, if applicable (otherwise NULL).
1133 queue_add (void *cls, uint16_t type, size_t size,
1134 struct MeshPeer *dst,
1135 struct MeshConnection *c,
1136 struct MeshChannel *ch);
1140 * Free a transmission that was already queued with all resources
1141 * associated to the request.
1143 * @param queue Queue handler to cancel.
1144 * @param clear_cls Is it necessary to free associated cls?
1147 queue_destroy (struct MeshPeerQueue *queue, int clear_cls);
1151 * Core callback to write a queued packet to core buffer
1153 * @param cls Closure (peer info).
1154 * @param size Number of bytes available in buf.
1155 * @param buf Where the to write the message.
1157 * @return number of bytes written to buf
1160 queue_send (void *cls, size_t size, void *buf);
1164 * Dummy function to separate declarations from definitions in function list.
1167 __mesh_divider______________________________________________________________();
1171 * Get string description for tunnel state.
1173 * @param s Tunnel state.
1175 * @return String representation.
1178 GNUNET_MESH_DEBUG_TS2S (enum MeshTunnelState s)
1180 static char buf[128];
1184 case MESH_TUNNEL_NEW:
1185 return "MESH_TUNNEL_NEW";
1186 case MESH_TUNNEL_SEARCHING:
1187 return "MESH_TUNNEL_SEARCHING";
1188 case MESH_TUNNEL_WAITING:
1189 return "MESH_TUNNEL_WAITING";
1190 case MESH_TUNNEL_READY:
1191 return "MESH_TUNNEL_READY";
1192 case MESH_TUNNEL_RECONNECTING:
1193 return "MESH_TUNNEL_RECONNECTING";
1196 sprintf (buf, "%u (UNKNOWN STATE)", s);
1203 * Get string description for tunnel state.
1205 * @param s Tunnel state.
1207 * @return String representation.
1210 GNUNET_MESH_DEBUG_CS2S (enum MeshTunnelState s)
1214 case MESH_CONNECTION_NEW:
1215 return "MESH_CONNECTION_NEW";
1216 case MESH_CONNECTION_SENT:
1217 return "MESH_CONNECTION_SENT";
1218 case MESH_CONNECTION_READY:
1219 return "MESH_CONNECTION_READY";
1221 return "MESH_CONNECTION_STATE_ERROR";
1227 /******************************************************************************/
1228 /************************ PERIODIC FUNCTIONS ****************************/
1229 /******************************************************************************/
1232 * Periodically announce self id in the DHT
1234 * @param cls closure
1235 * @param tc task context
1238 announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1240 struct PBlock block;
1242 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1244 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
1248 * - Set data expiration in function of X
1249 * - Adapt X to churn
1251 DEBUG_DHT ("DHT_put for ID %s started.\n", GNUNET_i2s (&my_full_id));
1253 block.id = my_full_id;
1254 GNUNET_DHT_put (dht_handle, /* DHT handle */
1255 &my_full_id.hashPubKey, /* Key to use */
1256 dht_replication_level, /* Replication level */
1257 GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, /* DHT options */
1258 GNUNET_BLOCK_TYPE_MESH_PEER, /* Block type */
1259 sizeof (block), /* Size of the data */
1260 (const char *) &block, /* Data itself */
1261 GNUNET_TIME_UNIT_FOREVER_ABS, /* Data expiration */
1262 GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */
1263 NULL, /* Continuation */
1264 NULL); /* Continuation closure */
1266 GNUNET_SCHEDULER_add_delayed (id_announce_time, &announce_id, cls);
1270 /******************************************************************************/
1271 /****************** GENERAL HELPER FUNCTIONS ************************/
1272 /******************************************************************************/
1276 * Get the static string for a peer ID.
1280 * @return Static string for it's ID.
1283 peer2s (const struct MeshPeer *peer)
1287 return GNUNET_i2s (GNUNET_PEER_resolve2 (peer->id));
1292 * Get the previous hop in a connection
1294 * @param c Connection.
1296 * @return Previous peer in the connection.
1298 static struct MeshPeer *
1299 connection_get_prev_hop (struct MeshConnection *c)
1303 if (0 == c->own_pos || c->path->length < 2)
1304 id = c->path->peers[0];
1306 id = c->path->peers[c->own_pos - 1];
1308 return peer_get_short (id);
1313 * Get the next hop in a connection
1315 * @param c Connection.
1317 * @return Next peer in the connection.
1319 static struct MeshPeer *
1320 connection_get_next_hop (struct MeshConnection *c)
1324 if ((c->path->length - 1) == c->own_pos || c->path->length < 2)
1325 id = c->path->peers[c->path->length - 1];
1327 id = c->path->peers[c->own_pos + 1];
1329 return peer_get_short (id);
1334 * Get the hop in a connection.
1336 * @param c Connection.
1337 * @param fwd Next hop?
1339 * @return Next peer in the connection.
1341 static struct MeshPeer *
1342 connection_get_hop (struct MeshConnection *c, int fwd)
1345 return connection_get_next_hop (c);
1346 return connection_get_prev_hop (c);
1350 * Check if client has registered with the service and has not disconnected
1352 * @param client the client to check
1354 * @return non-NULL if client exists in the global DLL
1356 static struct MeshClient *
1357 client_get (struct GNUNET_SERVER_Client *client)
1359 return GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
1364 * Deletes a tunnel from a client (either owner or destination).
1366 * @param c Client whose tunnel to delete.
1367 * @param ch Channel which should be deleted.
1370 client_delete_channel (struct MeshClient *c, struct MeshChannel *ch)
1376 res = GNUNET_CONTAINER_multihashmap32_remove (c->own_channels,
1378 if (GNUNET_YES != res)
1379 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client_delete_channel owner KO\n");
1383 res = GNUNET_CONTAINER_multihashmap32_remove (c->incoming_channels,
1385 if (GNUNET_YES != res)
1386 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client_delete_tunnel client KO\n");
1392 * Notify the appropriate client that a new incoming channel was created.
1394 * @param ch Channel that was created.
1397 send_local_channel_create (struct MeshChannel *ch)
1399 struct GNUNET_MESH_ChannelMessage msg;
1400 struct MeshTunnel2 *t = ch->t;
1402 if (NULL == ch->dest)
1404 msg.header.size = htons (sizeof (msg));
1405 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
1406 msg.channel_id = htonl (ch->lid_dest);
1407 msg.port = htonl (ch->port);
1409 msg.opt |= GNUNET_YES == ch->reliable ? GNUNET_MESH_OPTION_RELIABLE : 0;
1410 msg.opt |= GNUNET_YES == ch->nobuffer ? GNUNET_MESH_OPTION_NOBUFFER : 0;
1411 msg.opt = htonl (msg.opt);
1412 GNUNET_PEER_resolve (t->peer->id, &msg.peer);
1413 GNUNET_SERVER_notification_context_unicast (nc, ch->dest->handle,
1414 &msg.header, GNUNET_NO);
1419 * Notify a client that the incoming tunnel is no longer valid.
1421 * @param ch Channel that is destroyed.
1422 * @param fwd Forward notification (owner->dest)?
1425 send_local_channel_destroy (struct MeshChannel *ch, int fwd)
1427 struct GNUNET_MESH_ChannelMessage msg;
1428 struct MeshClient *c;
1430 c = fwd ? ch->dest : ch->root;
1436 msg.header.size = htons (sizeof (msg));
1437 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1438 msg.channel_id = htonl (fwd ? ch->lid_dest : ch->lid_root);
1439 msg.port = htonl (0);
1440 memset (&msg.peer, 0, sizeof (msg.peer));
1441 msg.opt = htonl (0);
1442 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
1443 &msg.header, GNUNET_NO);
1448 * Build a local ACK message and send it to a local client.
1450 * @param ch Channel on which to send the ACK.
1451 * @param c Client to whom send the ACK.
1452 * @param is_fwd Set to GNUNET_YES for FWD ACK (dest->owner)
1455 send_local_ack (struct MeshChannel *ch,
1456 struct MeshClient *c,
1459 struct GNUNET_MESH_LocalAck msg;
1461 msg.header.size = htons (sizeof (msg));
1462 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
1463 msg.channel_id = htonl (is_fwd ? ch->lid_root : ch->lid_dest);
1464 GNUNET_SERVER_notification_context_unicast (nc,
1472 * Count established (ready) connections of a tunnel.
1474 * @param t Tunnel on which to send the message.
1476 * @return Number of connections.
1479 tunnel_count_connections (struct MeshTunnel2 *t)
1481 struct MeshConnection *c;
1484 for (c = t->connection_head, i = 0; NULL != c; c = c->next, i++);
1491 * Pick a connection on which send the next data message.
1493 * @param t Tunnel on which to send the message.
1494 * @param fwd Is this a fwd message?
1496 * @return The connection on which to send the next message.
1498 static struct MeshConnection *
1499 tunnel_get_connection (struct MeshTunnel2 *t, int fwd)
1501 struct MeshConnection *c;
1502 struct MeshConnection *best;
1503 struct MeshFlowControl *fc;
1504 unsigned int lowest_q;
1507 lowest_q = UINT_MAX;
1508 for (c = t->connection_head; NULL != c; c = c->next)
1510 if (MESH_CONNECTION_READY == c->state)
1512 fc = fwd ? &c->fwd_fc : &c->bck_fc;
1518 if (fc->queue_n < lowest_q)
1521 lowest_q = fc->queue_n;
1530 * Get the total buffer space for a tunnel.
1533 tunnel_get_buffer (struct MeshTunnel2 *t, int fwd)
1535 struct MeshConnection *c;
1536 struct MeshFlowControl *fc;
1537 unsigned int buffer;
1539 for (buffer = 0, c = t->connection_head; NULL != c; c = c->next)
1541 if (c->state != MESH_CONNECTION_READY)
1544 fc = fwd ? &c->fwd_fc : &c->bck_fc;
1545 buffer += fc->last_ack_recv - fc->last_pid_sent;
1553 * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
1554 * Encrypt data with the tunnel key.
1556 * @param t Tunnel whose key to use.
1557 * @param dst Destination for the encrypted data.
1558 * @param src Source of the plaintext.
1559 * @param size Size of the plaintext.
1560 * @param iv Initialization Vector to use.
1561 * @param fwd Is this a fwd message?
1564 tunnel_encrypt (struct MeshTunnel2 *t,
1565 void *dst, const void *src,
1566 size_t size, uint64_t iv, int fwd)
1568 memcpy (dst, src, size);
1573 * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
1574 * Decrypt data with the tunnel key.
1576 * @param t Tunnel whose key to use.
1577 * @param dst Destination for the plaintext.
1578 * @param src Source of the encrypted data.
1579 * @param size Size of the encrypted data.
1580 * @param iv Initialization Vector to use.
1581 * @param fwd Is this a fwd message?
1584 tunnel_decrypt (struct MeshTunnel2 *t,
1585 void *dst, const void *src,
1586 size_t size, uint64_t iv, int fwd)
1588 memcpy (dst, src, size);
1593 * Sends an already built message on a connection, properly registering
1594 * all used resources.
1596 * @param message Message to send. Function makes a copy of it.
1597 * If message is not hop-by-hop, decrements TTL of copy.
1598 * @param c Connection on which this message is transmitted.
1599 * @param ch Channel on which this message is transmitted, or NULL.
1600 * @param fwd Is this a fwd message?
1603 send_prebuilt_message_connection (const struct GNUNET_MessageHeader *message,
1604 struct MeshConnection *c,
1605 struct MeshChannel *ch,
1608 struct MeshPeer *neighbor;
1613 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send on Connection %s[%X]\n",
1614 GNUNET_h2s (&c->t->id), c->id);
1615 neighbor = connection_get_hop (c, fwd);
1616 if (NULL == neighbor)
1622 size = ntohs (message->size);
1623 data = GNUNET_malloc (size);
1624 memcpy (data, message, size);
1625 type = ntohs (message->type);
1627 if (GNUNET_MESSAGE_TYPE_MESH_FWD == type ||
1628 GNUNET_MESSAGE_TYPE_MESH_BCK == type)
1630 struct GNUNET_MESH_Encrypted *msg;
1633 msg = (struct GNUNET_MESH_Encrypted *) data;
1634 ttl = ntohl (msg->ttl);
1637 GNUNET_break_op (0);
1640 msg->ttl = htonl (ttl - 1);
1653 * Sends an already built message on a tunnel, choosing the best connection.
1655 * @param message Message to send. Function modifies it.
1656 * @param t Tunnel on which this message is transmitted.
1657 * @param ch Channel on which this message is transmitted.
1658 * @param fwd Is this a fwd message?
1661 send_prebuilt_message_tunnel (struct GNUNET_MESH_Encrypted *msg,
1662 struct MeshTunnel2 *t,
1663 struct MeshChannel *ch,
1666 struct MeshConnection *c;
1669 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send on Tunnel %s\n",
1670 GNUNET_h2s (&t->id));
1671 c = tunnel_get_connection (t, fwd);
1677 type = ntohs (msg->header.type);
1680 case GNUNET_MESSAGE_TYPE_MESH_FWD:
1681 case GNUNET_MESSAGE_TYPE_MESH_BCK:
1682 msg->cid = htonl (c->id);
1684 msg->ttl = default_ttl;
1687 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n",
1688 GNUNET_MESH_DEBUG_M2S (type));
1692 send_prebuilt_message_connection (&msg->header, c, ch, fwd);
1697 * Sends an already built message on a channel, properly registering
1698 * all used resources and encrypting the message with the tunnel's key.
1700 * @param message Message to send. Function makes a copy of it.
1701 * @param ch Channel on which this message is transmitted.
1702 * @param fwd Is this a fwd message?
1705 send_prebuilt_message_channel (const struct GNUNET_MessageHeader *message,
1706 struct MeshChannel *ch,
1709 struct GNUNET_MESH_Encrypted *msg;
1710 size_t size = ntohs (message->size);
1711 char *cbuf[sizeof (struct GNUNET_MESH_Encrypted) + size];
1715 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send on Channel %s:%X\n",
1716 GNUNET_h2s (&ch->t->id), ch->gid);
1717 type = fwd ? GNUNET_MESSAGE_TYPE_MESH_FWD : GNUNET_MESSAGE_TYPE_MESH_BCK;
1718 iv = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_NONCE, UINT64_MAX);
1720 msg = (struct GNUNET_MESH_Encrypted *) cbuf;
1721 msg->header.type = htons (type);
1722 msg->header.size = htons (sizeof (struct GNUNET_MESH_Encrypted) + size);
1723 msg->iv = GNUNET_htonll (iv);
1724 tunnel_encrypt (ch->t, &msg[1], message, size, iv, fwd);
1726 send_prebuilt_message_tunnel (msg, ch->t, ch, fwd);
1731 * Sends a CREATE CONNECTION message for a path to a peer.
1732 * Changes the connection and tunnel states if necessary.
1734 * @param connection Connection to create.
1737 send_connection_create (struct MeshConnection *connection)
1739 struct MeshPeer *neighbor;
1740 struct MeshTunnel2 *t;
1743 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send connection create\n");
1744 neighbor = connection_get_next_hop (connection);
1745 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " to %s\n", peer2s (neighbor));
1746 queue_add (connection,
1747 GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE,
1748 sizeof (struct GNUNET_MESH_ConnectionCreate) +
1749 (connection->path->length *
1750 sizeof (struct GNUNET_PeerIdentity)),
1754 if (MESH_TUNNEL_SEARCHING == t->state || MESH_TUNNEL_NEW == t->state)
1755 tunnel_change_state (t, MESH_TUNNEL_WAITING);
1756 if (MESH_CONNECTION_NEW == connection->state)
1757 connection_change_state (connection, MESH_CONNECTION_SENT);
1762 * Sends a CONNECTION ACK message in reponse to a received CONNECTION_CREATE
1765 * @param connection Connection to confirm.
1768 send_connection_ack (struct MeshConnection *connection)
1770 struct MeshPeer *neighbor;
1771 struct MeshTunnel2 *t;
1774 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send connection ack\n");
1775 neighbor = connection_get_prev_hop (connection);
1776 queue_add (connection,
1777 GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK,
1778 sizeof (struct GNUNET_MESH_ConnectionACK),
1782 if (MESH_TUNNEL_NEW == t->state)
1783 tunnel_change_state (t, MESH_TUNNEL_WAITING);
1788 * Build a hop-by-hop ACK message and queue it to send for the given connection.
1790 * @param c Which connection to send the hop-by-hop ACK.
1791 * @param ack Value of the ACK.
1792 * @param fwd Is this fwd?
1795 send_ack (struct MeshConnection *c, uint32_t ack, int fwd)
1797 struct GNUNET_MESH_ACK msg;
1799 msg.header.size = htons (sizeof (msg));
1800 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK);
1801 msg.ack = htonl (ack);
1803 msg.cid = htonl (c->id);
1805 send_prebuilt_message_connection (&msg.header, c, NULL, fwd);
1810 * Core callback to write a pre-constructed data packet to core buffer
1812 * @param cls Closure (MeshTransmissionDescriptor with data in "data" member).
1813 * @param size Number of bytes available in buf.
1814 * @param buf Where the to write the message.
1816 * @return number of bytes written to buf
1819 send_core_data_raw (void *cls, size_t size, void *buf)
1821 struct GNUNET_MessageHeader *msg = cls;
1824 GNUNET_assert (NULL != msg);
1825 total_size = ntohs (msg->size);
1827 if (total_size > size)
1832 memcpy (buf, msg, total_size);
1839 * Function to send a create connection message to a peer.
1841 * @param cls closure
1842 * @param size number of bytes available in buf
1843 * @param buf where the callee should write the message
1844 * @return number of bytes written to buf
1847 send_core_connection_create (void *cls, size_t size, void *buf)
1849 struct MeshConnection *c = cls;
1850 struct GNUNET_MESH_ConnectionCreate *msg;
1851 struct GNUNET_PeerIdentity *peer_ptr;
1852 struct MeshPeerPath *p = c->path;
1856 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION CREATE...\n");
1858 sizeof (struct GNUNET_MESH_ConnectionCreate) +
1859 p->length * sizeof (struct GNUNET_PeerIdentity);
1861 if (size < size_needed || NULL == buf)
1866 msg = (struct GNUNET_MESH_ConnectionCreate *) buf;
1867 msg->header.size = htons (size_needed);
1868 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE);
1869 msg->cid = htonl (c->id);
1870 msg->tid = c->t->id;
1872 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
1873 for (i = 0; i < p->length; i++)
1875 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
1878 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1879 "CONNECTION CREATE (%u bytes long) sent!\n", size_needed);
1885 * Creates a path ack message in buf and frees all unused resources.
1887 * @param cls closure (MeshTransmissionDescriptor)
1888 * @param size number of bytes available in buf
1889 * @param buf where the callee should write the message
1890 * @return number of bytes written to buf
1893 send_core_connection_ack (void *cls, size_t size, void *buf)
1895 struct GNUNET_MESH_ConnectionACK *msg = buf;
1896 struct MeshConnection *c = cls;
1897 struct MeshTunnel2 *t = c->t;
1899 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION ACK...\n");
1900 GNUNET_assert (NULL != t);
1901 if (sizeof (struct GNUNET_MESH_ConnectionACK) > size)
1906 msg->header.size = htons (sizeof (struct GNUNET_MESH_ConnectionACK));
1907 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK);
1908 msg->cid = htonl (c->id);
1911 /* TODO add signature */
1913 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION ACK sent!\n");
1914 return sizeof (struct GNUNET_MESH_ConnectionACK);
1919 * Destroy the peer_info and free any allocated resources linked to it
1921 * @param peer The peer_info to destroy.
1923 * @return GNUNET_OK on success
1926 peer_destroy (struct MeshPeer *peer)
1928 struct GNUNET_PeerIdentity id;
1929 struct MeshPeerPath *p;
1930 struct MeshPeerPath *nextp;
1932 GNUNET_PEER_resolve (peer->id, &id);
1933 GNUNET_PEER_change_rc (peer->id, -1);
1936 GNUNET_CONTAINER_multihashmap_remove (peers, &id.hashPubKey, peer))
1939 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1940 "removing peer %s, not in hashmap\n", GNUNET_i2s (&id));
1942 if (NULL != peer->dhtget)
1944 GNUNET_DHT_get_stop (peer->dhtget);
1946 p = peer->path_head;
1950 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
1954 tunnel_destroy_empty (peer->tunnel);
1961 * Returns if peer is used (has a tunnel, is neighbor).
1963 * @peer Peer to check.
1965 * @return GNUNET_YES if peer is in use.
1968 peer_is_used (struct MeshPeer *peer)
1970 struct MeshPeerPath *p;
1972 if (NULL != peer->tunnel)
1975 for (p = peer->path_head; NULL != p; p = p->next)
1984 * Iterator over all the peers to get the oldest timestamp.
1986 * @param cls Closure (unsued).
1987 * @param key ID of the peer.
1988 * @param value Peer_Info of the peer.
1991 peer_get_oldest (void *cls,
1992 const struct GNUNET_HashCode *key,
1995 struct MeshPeer *p = value;
1996 struct GNUNET_TIME_Absolute *abs = cls;
1998 /* Don't count active peers */
1999 if (GNUNET_YES == peer_is_used (p))
2002 if (abs->abs_value_us < p->last_contact.abs_value_us)
2003 abs->abs_value_us = p->last_contact.abs_value_us;
2010 * Iterator over all the peers to remove the oldest entry.
2012 * @param cls Closure (unsued).
2013 * @param key ID of the peer.
2014 * @param value Peer_Info of the peer.
2017 peer_timeout (void *cls,
2018 const struct GNUNET_HashCode *key,
2021 struct MeshPeer *p = value;
2022 struct GNUNET_TIME_Absolute *abs = cls;
2024 if (p->last_contact.abs_value_us == abs->abs_value_us &&
2025 GNUNET_NO == peer_is_used (p))
2035 * Delete oldest unused peer.
2038 peer_delete_oldest (void)
2040 struct GNUNET_TIME_Absolute abs;
2042 abs = GNUNET_TIME_UNIT_FOREVER_ABS;
2044 GNUNET_CONTAINER_multihashmap_iterate (peers,
2047 GNUNET_CONTAINER_multihashmap_iterate (peers,
2054 * Retrieve the MeshPeer stucture associated with the peer, create one
2055 * and insert it in the appropriate structures if the peer is not known yet.
2057 * @param peer Full identity of the peer.
2059 * @return Existing or newly created peer info.
2061 static struct MeshPeer *
2062 peer_get (const struct GNUNET_PeerIdentity *peer_id)
2064 struct MeshPeer *peer;
2066 peer = GNUNET_CONTAINER_multihashmap_get (peers, &peer_id->hashPubKey);
2069 peer = GNUNET_new (struct MeshPeer);
2070 if (GNUNET_CONTAINER_multihashmap_size (peers) > max_peers)
2072 peer_delete_oldest ();
2074 GNUNET_CONTAINER_multihashmap_put (peers, &peer_id->hashPubKey, peer,
2075 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
2076 peer->id = GNUNET_PEER_intern (peer_id);
2078 peer->last_contact = GNUNET_TIME_absolute_get();
2085 * Retrieve the MeshPeer stucture associated with the peer, create one
2086 * and insert it in the appropriate structures if the peer is not known yet.
2088 * @param peer Short identity of the peer.
2090 * @return Existing or newly created peer info.
2092 static struct MeshPeer *
2093 peer_get_short (const GNUNET_PEER_Id peer)
2095 return peer_get (GNUNET_PEER_resolve2 (peer));
2100 * Get a cost of a path for a peer considering existing tunnel connections.
2102 * @param peer Peer towards which the path is considered.
2103 * @param path Candidate path.
2105 * @return Cost of the path (path length + number of overlapping nodes)
2108 peer_get_path_cost (const struct MeshPeer *peer,
2109 const struct MeshPeerPath *path)
2111 struct MeshConnection *c;
2112 unsigned int overlap;
2120 GNUNET_assert (NULL != peer->tunnel);
2122 for (i = 0; i < path->length; i++)
2124 for (c = peer->tunnel->connection_head; NULL != c; c = c->next)
2126 for (j = 0; j < c->path->length; j++)
2128 if (path->peers[i] == c->path->peers[j])
2136 return (path->length + overlap) * (path->score * -1);
2141 * Choose the best path towards a peer considering the tunnel properties.
2143 * @param peer The destination peer.
2145 * @return Best current known path towards the peer, if any.
2147 static struct MeshPeerPath *
2148 peer_get_best_path (const struct MeshPeer *peer)
2150 struct MeshPeerPath *best_p;
2151 struct MeshPeerPath *p;
2152 struct MeshConnection *c;
2153 unsigned int best_cost;
2156 best_cost = UINT_MAX;
2158 for (p = peer->path_head; NULL != p; p = p->next)
2160 for (c = peer->tunnel->connection_head; NULL != c; c = c->next)
2164 continue; /* If path is in use in a connection, skip it. */
2166 if ((cost = peer_get_path_cost (peer, p)) < best_cost)
2176 queue_is_sendable (struct MeshPeerQueue *q)
2178 struct MeshFlowControl *fc;
2180 /* Is PID-independent? */
2183 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2184 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2188 /* Is PID allowed? */
2189 fc = q->fwd ? &q->c->fwd_fc : &q->c->bck_fc;
2190 if (GMC_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
2198 * Get first sendable message.
2200 * @param peer The destination peer.
2202 * @return Best current known path towards the peer, if any.
2204 static struct MeshPeerQueue *
2205 peer_get_first_message (const struct MeshPeer *peer)
2207 struct MeshPeerQueue *q;
2209 for (q = peer->queue_head; NULL != q; q = q->next)
2211 if (queue_is_sendable (q))
2220 * Try to establish a new connection to this peer in the given tunnel.
2221 * If the peer doesn't have any path to it yet, try to get one.
2222 * If the peer already has some path, send a CREATE CONNECTION towards it.
2224 * @param peer PeerInfo of the peer.
2227 peer_connect (struct MeshPeer *peer)
2229 struct MeshTunnel2 *t;
2230 struct MeshPeerPath *p;
2231 struct MeshConnection *c;
2233 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2234 "peer_connect towards %s\n",
2237 if (NULL != peer->path_head)
2239 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "path exists\n");
2240 p = peer_get_best_path (peer);
2243 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u hops\n", p->length);
2244 c = tunnel_use_path (t, p);
2245 send_connection_create (c);
2248 else if (NULL == peer->dhtget)
2250 const struct GNUNET_PeerIdentity *id;
2252 id = GNUNET_PEER_resolve2 (peer->id);
2253 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2254 " Starting DHT GET for peer %s\n", peer2s (peer));
2255 peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
2256 GNUNET_BLOCK_TYPE_MESH_PEER, /* type */
2257 &id->hashPubKey, /* key to search */
2258 dht_replication_level, /* replication level */
2259 GNUNET_DHT_RO_RECORD_ROUTE |
2260 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
2262 0, /* xquery bits */
2263 &dht_get_id_handler, peer);
2264 if (MESH_TUNNEL_NEW == t->state)
2265 tunnel_change_state (t, MESH_TUNNEL_SEARCHING);
2269 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2270 "There is no path but the DHT GET is already started.\n");
2276 * Get the first transmittable message for a connection.
2278 * @param c Connection.
2279 * @param fwd Is this FWD?
2281 * @return First transmittable message.
2283 static struct MeshPeerQueue *
2284 connection_get_first_message (struct MeshConnection *c, int fwd)
2286 struct MeshPeerQueue *q;
2289 p = connection_get_hop (c, fwd);
2291 for (q = p->queue_head; NULL != q; q = q->next)
2295 if (queue_is_sendable (q))
2304 * Is this peer the last one on the connection?
2306 * @param c Connection.
2307 * @param fwd Is this about fwd traffic?
2308 * Note that the ROOT is the terminal for BCK traffic!
2310 * @return GNUNET_YES if terminal, GNUNET_NO if relay/origin.
2313 connection_is_terminal (struct MeshConnection *c, int fwd)
2315 if (fwd && c->own_pos == c->path->length - 1)
2317 if (!fwd && c->own_pos == 0)
2324 * @brief Re-initiate traffic on this connection if necessary.
2326 * Check if there is traffic queued towards this peer
2327 * and the core transmit handle is NULL (traffic was stalled).
2328 * If so, call core tmt rdy.
2330 * @param c Connection on which initiate traffic.
2331 * @param fwd Is this about fwd traffic?
2334 connection_unlock_queue (struct MeshConnection *c, int fwd)
2336 struct MeshPeer *peer;
2337 struct MeshPeerQueue *q;
2340 peer = connection_get_hop (c, fwd);
2342 if (NULL != peer->core_transmit)
2343 return; /* Already unlocked */
2345 q = connection_get_first_message (c, fwd);
2347 return; /* Nothing to transmit */
2350 peer->core_transmit =
2351 GNUNET_CORE_notify_transmit_ready (core_handle,
2354 GNUNET_TIME_UNIT_FOREVER_REL,
2355 GNUNET_PEER_resolve2 (peer->id),
2363 * Cancel all transmissions that belong to a certain connection.
2365 * @param c Connection which to cancel.
2366 * @param fwd Cancel fwd traffic?
2369 connection_cancel_queues (struct MeshConnection *c, int fwd)
2371 struct MeshPeerQueue *q;
2372 struct MeshPeerQueue *next;
2373 struct MeshFlowControl *fc;
2374 struct MeshPeer *peer;
2381 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2382 peer = connection_get_hop (c, fwd);
2384 for (q = peer->queue_head; NULL != q; q = next)
2389 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2390 "connection_cancel_queue %s\n",
2391 GNUNET_MESH_DEBUG_M2S (q->type));
2392 queue_destroy (q, GNUNET_YES);
2395 if (NULL == peer->queue_head)
2397 if (NULL != peer->core_transmit)
2399 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
2400 peer->core_transmit = NULL;
2402 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
2404 GNUNET_SCHEDULER_cancel (fc->poll_task);
2405 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2412 * Remove all paths that rely on a direct connection between p1 and p2
2413 * from the peer itself and notify all tunnels about it.
2415 * @param peer PeerInfo of affected peer.
2416 * @param p1 GNUNET_PEER_Id of one peer.
2417 * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and
2420 * TODO: optimize (see below)
2423 peer_remove_path (struct MeshPeer *peer, GNUNET_PEER_Id p1,
2426 struct MeshPeerPath *p;
2427 struct MeshPeerPath *next;
2428 struct MeshPeer *peer_d;
2430 unsigned int destroyed;
2433 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path\n");
2435 for (p = peer->path_head; NULL != p; p = next)
2438 for (i = 0; i < (p->length - 1); i++)
2440 if ((p->peers[i] == p1 && p->peers[i + 1] == p2) ||
2441 (p->peers[i] == p2 && p->peers[i + 1] == p1))
2443 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
2454 d = tunnel_notify_connection_broken (peer->tunnel, p1, p2);
2456 peer_d = peer_get_short (d); // FIXME
2457 next = peer_get_best_path (peer_d);
2458 tunnel_use_path (peer->tunnel, next);
2459 peer_connect (peer_d);
2461 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path END\n");
2466 * Add the path to the peer and update the path used to reach it in case this
2469 * @param peer_info Destination peer to add the path to.
2470 * @param path New path to add. Last peer must be the peer in arg 1.
2471 * Path will be either used of freed if already known.
2472 * @param trusted Do we trust that this path is real?
2475 peer_add_path (struct MeshPeer *peer_info, struct MeshPeerPath *path,
2478 struct MeshPeerPath *aux;
2482 if ((NULL == peer_info) || (NULL == path))
2485 path_destroy (path);
2488 if (path->peers[path->length - 1] != peer_info->id)
2491 path_destroy (path);
2494 if (2 >= path->length && GNUNET_NO == trusted)
2496 /* Only allow CORE to tell us about direct paths */
2497 path_destroy (path);
2500 for (l = 1; l < path->length; l++)
2502 if (path->peers[l] == myid)
2504 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shortening path by %u\n", l);
2505 for (l2 = 0; l2 < path->length - l; l2++)
2507 path->peers[l2] = path->peers[l + l2];
2512 GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id));
2516 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
2517 path->length, peer2s (peer_info));
2519 l = path_get_length (path);
2522 path_destroy (path);
2526 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
2527 for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
2529 l2 = path_get_length (aux);
2532 GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
2533 peer_info->path_tail, aux, path);
2538 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
2540 path_destroy (path);
2545 GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail,
2552 * Add the path to the origin peer and update the path used to reach it in case
2553 * this is the shortest.
2554 * The path is given in peer_info -> destination, therefore we turn the path
2555 * upside down first.
2557 * @param peer_info Peer to add the path to, being the origin of the path.
2558 * @param path New path to add after being inversed.
2559 * Path will be either used or freed.
2560 * @param trusted Do we trust that this path is real?
2563 peer_add_path_to_origin (struct MeshPeer *peer_info,
2564 struct MeshPeerPath *path, int trusted)
2567 peer_add_path (peer_info, path, trusted);
2573 * Function called if a connection has been stalled for a while,
2574 * possibly due to a missed ACK. Poll the neighbor about its ACK status.
2576 * @param cls Closure (poll ctx).
2577 * @param tc TaskContext.
2580 connection_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2582 struct MeshFlowControl *fc = cls;
2583 struct GNUNET_MESH_Poll msg;
2584 struct MeshConnection *c;
2586 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2587 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2593 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** Polling!\n");
2594 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** connection %s[%X]\n",
2595 peer2s (c->t->peer), c->id);
2597 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL);
2598 msg.header.size = htons (sizeof (msg));
2599 msg.pid = htonl (fc->last_pid_sent);
2600 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** pid (%u)!\n", fc->last_pid_sent);
2601 send_prebuilt_message_connection (&msg.header, c, NULL, fc == &c->fwd_fc);
2602 fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
2603 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
2604 &connection_poll, fc);
2609 * Build a PeerPath from the paths returned from the DHT, reversing the paths
2610 * to obtain a local peer -> destination path and interning the peer ids.
2612 * @return Newly allocated and created path
2614 static struct MeshPeerPath *
2615 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
2616 unsigned int get_path_length,
2617 const struct GNUNET_PeerIdentity *put_path,
2618 unsigned int put_path_length)
2620 struct MeshPeerPath *p;
2626 GNUNET_PEER_change_rc (myid, 1);
2627 i = get_path_length;
2628 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " GET has %d hops.\n", i);
2629 for (i--; i >= 0; i--)
2631 id = GNUNET_PEER_intern (&get_path[i]);
2632 if (p->length > 0 && id == p->peers[p->length - 1])
2634 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
2635 GNUNET_PEER_change_rc (id, -1);
2639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from GET: %s.\n",
2640 GNUNET_i2s (&get_path[i]));
2642 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
2643 p->peers[p->length - 1] = id;
2646 i = put_path_length;
2647 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PUT has %d hops.\n", i);
2648 for (i--; i >= 0; i--)
2650 id = GNUNET_PEER_intern (&put_path[i]);
2653 /* PUT path went through us, so discard the path up until now and start
2654 * from here to get a much shorter (and loop-free) path.
2659 if (p->length > 0 && id == p->peers[p->length - 1])
2661 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
2662 GNUNET_PEER_change_rc (id, -1);
2666 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from PUT: %s.\n",
2667 GNUNET_i2s (&put_path[i]));
2669 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
2670 p->peers[p->length - 1] = id;
2674 if (get_path_length > 0)
2675 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of GET: %s)\n",
2676 GNUNET_i2s (&get_path[0]));
2677 if (put_path_length > 0)
2678 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of PUT: %s)\n",
2679 GNUNET_i2s (&put_path[0]));
2680 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " In total: %d hops\n",
2682 for (i = 0; i < p->length; i++)
2684 struct GNUNET_PeerIdentity peer_id;
2686 GNUNET_PEER_resolve (p->peers[i], &peer_id);
2687 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u: %s\n", p->peers[i],
2688 GNUNET_i2s (&peer_id));
2696 * Adds a path to the peer_infos of all the peers in the path
2698 * @param p Path to process.
2699 * @param confirmed Whether we know if the path works or not.
2702 path_add_to_peers (struct MeshPeerPath *p, int confirmed)
2706 /* TODO: invert and add */
2707 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
2708 for (i++; i < p->length; i++)
2710 struct MeshPeer *aux;
2711 struct MeshPeerPath *copy;
2713 aux = peer_get_short (p->peers[i]);
2714 copy = path_duplicate (p);
2715 copy->length = i + 1;
2716 peer_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
2722 * Search for a channel among the channels for a client
2724 * @param c the client whose channels to search in
2725 * @param chid the local id of the channel
2727 * @return channel handler, NULL if doesn't exist
2729 static struct MeshChannel *
2730 channel_get_by_local_id (struct MeshClient *c, MESH_ChannelNumber chid)
2732 if (0 == (chid & GNUNET_MESH_LOCAL_CHANNEL_ID_CLI))
2734 GNUNET_break_op (0);
2735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CHID %X not a local chid\n", chid);
2738 if (chid >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV)
2739 return GNUNET_CONTAINER_multihashmap32_get (c->incoming_channels, chid);
2740 return GNUNET_CONTAINER_multihashmap32_get (c->own_channels, chid);
2744 * Search for a tunnel by global ID using full PeerIdentities.
2746 * @param t Tunnel containing the channel.
2747 * @param chid Public channel number.
2749 * @return channel handler, NULL if doesn't exist
2751 static struct MeshChannel *
2752 channel_get (struct MeshTunnel2 *t, MESH_ChannelNumber chid)
2754 struct MeshChannel *ch;
2759 for (ch = t->channel_head; NULL != ch; ch = ch->next)
2761 if (ch->gid == chid)
2770 * Change the tunnel state.
2772 * @param t Tunnel whose state to change.
2773 * @param state New state.
2776 tunnel_change_state (struct MeshTunnel2* t, enum MeshTunnelState state)
2778 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2779 "Tunnel %s state was %s\n",
2781 GNUNET_MESH_DEBUG_TS2S (t->state));
2782 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2783 "Tunnel %s state is now %s\n",
2785 GNUNET_MESH_DEBUG_TS2S (state));
2791 * Cache a message to be sent once tunnel is online.
2793 * @param t Tunnel to hold the message.
2794 * @param ch Channel the message is about.
2795 * @param msg Message itself (copy will be made).
2796 * @param fwd Is this fwd?
2799 tunnel_queue_data (struct MeshTunnel2 *t,
2800 struct MeshChannel *ch,
2801 struct GNUNET_MessageHeader *msg,
2804 struct MeshTunnelQueue *tq;
2805 uint16_t size = ntohs (msg->size);
2807 tq = GNUNET_malloc (sizeof (struct MeshTunnelQueue) + size);
2810 memcpy (&tq[1], msg, size);
2811 GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tq);
2816 * Send all cached messages that we can, tunnel is online.
2818 * @param t Tunnel that holds the messages.
2819 * @param fwd Is this fwd?
2822 tunnel_send_queued_data (struct MeshTunnel2 *t, int fwd)
2824 struct MeshTunnelQueue *tq;
2825 struct MeshTunnelQueue *next;
2828 room = tunnel_get_buffer (t, fwd);
2829 for (tq = t->tq_head; NULL != tq && room > 0; tq = next)
2833 GNUNET_CONTAINER_DLL_remove (t->tq_head, t->tq_tail, tq);
2834 send_prebuilt_message_channel ((struct GNUNET_MessageHeader *) &tq[1],
2843 connection_change_state (struct MeshConnection* c,
2844 enum MeshConnectionState state)
2846 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2847 "Connection %s[%X] state was %s\n",
2848 peer2s (c->t->peer), c->id,
2849 GNUNET_MESH_DEBUG_CS2S (c->state));
2850 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2851 "Connection %s[%X] state is now %s\n",
2852 peer2s (c->t->peer), c->id,
2853 GNUNET_MESH_DEBUG_CS2S (state));
2859 * Add a client to a channel, initializing all needed data structures.
2861 * @param ch Channel to which add the client.
2862 * @param c Client which to add to the channel.
2865 channel_add_client (struct MeshChannel *ch, struct MeshClient *c)
2867 struct MeshTunnel2 *t = ch->t;
2869 if (NULL != ch->dest)
2875 /* Assign local id as destination */
2876 while (NULL != channel_get_by_local_id (c, t->next_local_chid))
2877 t->next_local_chid = (t->next_local_chid + 1) | GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
2878 ch->lid_dest = t->next_local_chid++;
2879 t->next_local_chid = t->next_local_chid | GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
2881 /* Store in client's hashmap */
2883 GNUNET_CONTAINER_multihashmap32_put (c->incoming_channels,
2885 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
2894 static struct MeshConnection *
2895 tunnel_use_path (struct MeshTunnel2 *t, struct MeshPeerPath *p)
2897 struct MeshConnection *c;
2898 unsigned int own_pos;
2900 c = connection_new (&t->id, t->next_cid++);
2901 for (own_pos = 0; own_pos < p->length; own_pos++)
2903 if (p->peers[own_pos] == myid)
2906 if (own_pos > p->length - 1)
2909 connection_destroy (c);
2912 c->own_pos = own_pos;
2917 c->fwd_maintenance_task =
2918 GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
2919 &connection_fwd_keepalive, c);
2926 * Notifies a tunnel that a connection has broken that affects at least
2927 * some of its peers. Sends a notification towards the root of the tree.
2928 * In case the peer is the owner of the tree, notifies the client that owns
2929 * the tunnel and tries to reconnect.
2931 * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
2933 * @param t Tunnel affected.
2934 * @param p1 Peer that got disconnected from p2.
2935 * @param p2 Peer that got disconnected from p1.
2937 * @return Short ID of the peer disconnected (either p1 or p2).
2938 * 0 if the tunnel remained unaffected.
2940 static GNUNET_PEER_Id
2941 tunnel_notify_connection_broken (struct MeshTunnel2* t,
2942 GNUNET_PEER_Id p1, GNUNET_PEER_Id p2)
2944 // if (myid != p1 && myid != p2) FIXME
2949 // if (tree_get_predecessor (t->tree) != 0)
2951 // /* We are the peer still connected, notify owner of the disconnection. */
2952 // struct GNUNET_MESH_PathBroken msg;
2953 // struct GNUNET_PeerIdentity neighbor;
2955 // msg.header.size = htons (sizeof (msg));
2956 // msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN);
2957 // GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2958 // msg.tid = htonl (t->id.tid);
2959 // msg.peer1 = my_full_id;
2960 // GNUNET_PEER_resolve (pid, &msg.peer2);
2961 // GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor);
2962 // send_prebuilt_message (&msg.header, &neighbor, t);
2969 * Send an end-to-end FWD ACK message for the most recent in-sequence payload.
2971 * @param ch Channel this is about.
2972 * @param fwd Is for FWD traffic? (ACK dest->owner)
2975 channel_send_data_ack (struct MeshChannel *ch, int fwd)
2977 struct GNUNET_MESH_DataACK msg;
2978 struct MeshChannelReliability *rel;
2979 struct MeshReliableMessage *copy;
2984 if (GNUNET_NO == ch->reliable)
2989 rel = fwd ? ch->bck_rel : ch->fwd_rel;
2990 mid = fwd ? &ch->mid_recv_fwd : &ch->mid_recv_bck;
2991 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2992 "send_data_ack for %u\n",
2995 msg.header.type = htons (fwd ? GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK :
2996 GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK);
2997 msg.header.size = htons (sizeof (msg));
2998 msg.chid = htonl (ch->gid);
2999 msg.mid = htonl (*mid - 1);
3001 for (copy = rel->head_recv; NULL != copy; copy = copy->next)
3003 delta = copy->mid - *mid;
3006 mask = 0x1LL << delta;
3007 msg.futures |= mask;
3008 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3009 " setting bit for %u (delta %u) (%llX) -> %llX\n",
3010 copy->mid, delta, mask, msg.futures);
3012 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " final futures %llX\n", msg.futures);
3014 send_prebuilt_message_channel (&msg.header, ch, fwd);
3015 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_data_ack END\n");
3020 * Send an ACK informing the predecessor about the available buffer space.
3022 * Note that for fwd ack, the FWD mean forward *traffic* (root->dest),
3023 * the ACK itself goes "back" (dest->root).
3025 * @param c Connection on which to send the ACK.
3026 * @param fwd Is this FWD ACK? (Going dest->owner)
3029 connection_send_ack (struct MeshConnection *c, int fwd)
3031 struct MeshFlowControl *next_fc;
3032 struct MeshFlowControl *prev_fc;
3036 next_fc = fwd ? &c->fwd_fc : &c->bck_fc;
3037 prev_fc = fwd ? &c->bck_fc : &c->fwd_fc;
3039 /* Check if we need to transmit the ACK */
3040 if (prev_fc->last_ack_sent - prev_fc->last_pid_recv > 3)
3042 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer > 3\n");
3043 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3044 " last pid recv: %u, last ack sent: %u\n",
3045 prev_fc->last_pid_recv, prev_fc->last_ack_sent);
3049 /* Ok, ACK might be necessary, what PID to ACK? */
3050 delta = next_fc->queue_max - next_fc->queue_n;
3051 ack = prev_fc->last_pid_recv + delta;
3052 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
3053 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3054 " last pid %u, last ack %u, qmax %u, q %u\n",
3055 prev_fc->last_pid_recv, prev_fc->last_ack_sent,
3056 next_fc->queue_max, next_fc->queue_n);
3057 if (ack == prev_fc->last_ack_sent)
3059 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
3063 prev_fc->last_ack_sent = ack;
3064 send_ack (c, ack, fwd);
3069 * Send an ACK informing the client about available buffer space.
3071 * Note that although the name is fwd_ack, the FWD mean forward *traffic*,
3072 * the ACK itself goes "back" (towards root).
3074 * @param ch Channel on which to send the ACK, NULL if unknown.
3075 * @param fwd Is this FWD ACK? (Going dest->owner)
3078 // channel_send_ack (struct MeshChannel *ch, uint16_t type, int fwd)
3080 // struct MeshChannelReliability *rel;
3081 // struct MeshFlowControl *next_fc;
3082 // struct MeshFlowControl *prev_fc;
3083 // struct MeshClient *c;
3084 // struct MeshClient *o;
3085 // GNUNET_PEER_Id hop;
3086 // uint32_t delta_mid;
3090 // rel = fwd ? ch->fwd_rel : ch->bck_rel;
3091 // c = fwd ? ch->client : ch->owner;
3092 // o = fwd ? ch->owner : ch->client;
3093 // hop = fwd ? connection_get_prev_hop (cn) : connection_get_next_hop (cn);
3094 // next_fc = fwd ? &t->next_fc : &t->prev_fc;
3095 // prev_fc = fwd ? &t->prev_fc : &t->next_fc;
3099 // case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3100 // case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3101 // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3102 // "ACK due to %s\n",
3103 // GNUNET_MESH_DEBUG_M2S (type));
3104 // if (GNUNET_YES == t->nobuffer && (GNUNET_NO == t->reliable || NULL == c))
3106 // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, nobuffer\n");
3109 // if (GNUNET_YES == t->reliable && NULL != c)
3110 // tunnel_send_data_ack (t, fwd);
3112 // case GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK:
3113 // case GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK:
3114 // case GNUNET_MESSAGE_TYPE_MESH_ACK:
3115 // case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
3117 // case GNUNET_MESSAGE_TYPE_MESH_POLL:
3118 // case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
3119 // t->force_ack = GNUNET_YES;
3122 // GNUNET_break (0);
3125 // /* Check if we need to transmit the ACK */
3127 // prev_fc->last_ack_sent - prev_fc->last_pid_recv > 3 &&
3128 // GNUNET_NO == t->force_ack)
3130 // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer free\n");
3131 // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3132 // " last pid recv: %u, last ack sent: %u\n",
3133 // prev_fc->last_pid_recv, prev_fc->last_ack_sent);
3137 // /* Ok, ACK might be necessary, what PID to ACK? */
3138 // delta = t->queue_max - next_fc->queue_n;
3139 // if (NULL != o && GNUNET_YES == t->reliable && NULL != rel->head_sent)
3140 // delta_mid = rel->mid_sent - rel->head_sent->mid;
3143 // if (0 > delta || (GNUNET_YES == t->reliable &&
3145 // (10 < rel->n_sent || 64 <= delta_mid)))
3147 // if (NULL != o && delta > 1)
3149 // ack = prev_fc->last_pid_recv + delta;
3150 // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
3151 // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3152 // " last pid %u, last ack %u, qmax %u, q %u\n",
3153 // prev_fc->last_pid_recv, prev_fc->last_ack_sent,
3154 // t->queue_max, next_fc->queue_n);
3155 // if (ack == prev_fc->last_ack_sent && GNUNET_NO == t->force_ack)
3157 // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
3161 // prev_fc->last_ack_sent = ack;
3163 // send_local_ack (t, o, fwd);
3164 // else if (0 != hop)
3165 // send_ack (t, hop, ack);
3167 // GNUNET_break (GNUNET_YES == t->destroy);
3168 // t->force_ack = GNUNET_NO;
3173 * Modify the mesh message TID from global to local and send to client.
3175 * @param ch Channel on which to send the message.
3176 * @param msg Message to modify and send.
3177 * @param c Client to send to.
3178 * @param tid Tunnel ID to use (c can be both owner and client).
3181 channel_send_client_to_tid (struct MeshChannel *ch,
3182 const struct GNUNET_MESH_Data *msg,
3183 struct MeshClient *c, MESH_ChannelNumber id)
3185 struct GNUNET_MESH_LocalData *copy;
3186 uint16_t size = ntohs (msg->header.size) - sizeof (struct GNUNET_MESH_Data);
3187 char cbuf[size + sizeof (struct GNUNET_MESH_LocalData)];
3189 if (size < sizeof (struct GNUNET_MessageHeader))
3191 GNUNET_break_op (0);
3199 copy = (struct GNUNET_MESH_LocalData *) cbuf;
3200 memcpy (©[1], &msg[1], size);
3201 copy->header.size = htons (sizeof (struct GNUNET_MESH_LocalData) + size);
3202 copy->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA);
3203 copy->id = htonl (id);
3204 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
3205 ©->header, GNUNET_NO);
3209 * Modify the data message ID from global to local and send to client.
3211 * @param ch Channel on which to send the message.
3212 * @param msg Message to modify and send.
3213 * @param fwd Forward?
3216 channel_send_client_data (struct MeshChannel *ch,
3217 const struct GNUNET_MESH_Data *msg,
3221 channel_send_client_to_tid (ch, msg, ch->dest, ch->lid_dest);
3223 channel_send_client_to_tid (ch, msg, ch->root, ch->lid_root);
3228 * Send a buffered message to the client, for in order delivery or
3229 * as result of client ACK.
3231 * @param ch Channel on which to empty the message buffer.
3232 * @param c Client to send to.
3233 * @param rel Reliability structure to corresponding peer.
3234 * If rel == bck_rel, this is FWD data.
3237 channel_send_client_buffered_data (struct MeshChannel *ch,
3238 struct MeshClient *c,
3239 struct MeshChannelReliability *rel)
3241 struct MeshReliableMessage *copy;
3244 if (GNUNET_NO == rel->client_ready)
3246 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client not ready\n");
3250 mid = rel == ch->bck_rel ? &ch->mid_recv_fwd : &ch->mid_recv_bck;
3252 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data\n");
3253 copy = rel->head_recv;
3256 if (copy->mid == *mid || GNUNET_NO == ch->reliable)
3258 struct GNUNET_MESH_Data *msg = (struct GNUNET_MESH_Data *) ©[1];
3260 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3261 " have %u! now expecting %u\n",
3262 copy->mid, *mid + 1);
3263 channel_send_client_data (ch, msg, (rel == ch->bck_rel));
3266 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
3271 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3272 " reliable && don't have %u, next is %u\n",
3278 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data END\n");
3283 * We have received a message out of order, or the client is not ready.
3284 * Buffer it until we receive an ACK from the client or the missing
3285 * message from the channel.
3287 * @param msg Message to buffer.
3288 * @param rel Reliability data to the corresponding direction.
3291 channel_rel_add_buffered_data (const struct GNUNET_MESH_Data *msg,
3292 struct MeshChannelReliability *rel)
3294 struct MeshReliableMessage *copy;
3295 struct MeshReliableMessage *prev;
3299 size = ntohs (msg->header.size);
3300 mid = ntohl (msg->mid);
3301 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data %u\n", mid);
3303 copy = GNUNET_malloc (sizeof (*copy) + size);
3306 memcpy (©[1], msg, size);
3310 // FIXME do something better than O(n), although n < 64...
3311 // FIXME start from the end (most messages are the latest ones)
3312 for (prev = rel->head_recv; NULL != prev; prev = prev->next)
3314 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " prev %u\n", prev->mid);
3315 if (GMC_is_pid_bigger (prev->mid, mid))
3317 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " bingo!\n");
3318 GNUNET_CONTAINER_DLL_insert_before (rel->head_recv, rel->tail_recv,
3323 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " insert at tail!\n");
3324 GNUNET_CONTAINER_DLL_insert_tail (rel->head_recv, rel->tail_recv, copy);
3325 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data END\n");
3330 * Destroy a reliable message after it has been acknowledged, either by
3331 * direct mid ACK or bitfield. Updates the appropriate data structures and
3332 * timers and frees all memory.
3334 * @param copy Message that is no longer needed: remote peer got it.
3337 rel_message_free (struct MeshReliableMessage *copy)
3339 struct MeshChannelReliability *rel;
3340 struct GNUNET_TIME_Relative time;
3343 time = GNUNET_TIME_absolute_get_duration (copy->timestamp);
3344 rel->expected_delay.rel_value_us *= 7;
3345 rel->expected_delay.rel_value_us += time.rel_value_us;
3346 rel->expected_delay.rel_value_us /= 8;
3348 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Freeing %u\n", copy->mid);
3349 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " n_sent %u\n", rel->n_sent);
3350 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! took %s\n",
3351 GNUNET_STRINGS_relative_time_to_string (time, GNUNET_NO));
3352 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! new expected delay %s\n",
3353 GNUNET_STRINGS_relative_time_to_string (rel->expected_delay,
3355 rel->retry_timer = rel->expected_delay;
3356 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
3362 * Destroy all reliable messages queued for a channel,
3363 * during a channel destruction.
3364 * Frees the reliability structure itself.
3366 * @param rel Reliability data for a channel.
3369 channel_rel_free_all (struct MeshChannelReliability *rel)
3371 struct MeshReliableMessage *copy;
3372 struct MeshReliableMessage *next;
3377 for (copy = rel->head_recv; NULL != copy; copy = next)
3380 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
3383 for (copy = rel->head_sent; NULL != copy; copy = next)
3386 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
3389 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
3390 GNUNET_SCHEDULER_cancel (rel->retry_task);
3396 * Mark future messages as ACK'd.
3398 * @param rel Reliability data.
3399 * @param msg DataACK message with a bitfield of future ACK'd messages.
3402 channel_rel_free_sent (struct MeshChannelReliability *rel,
3403 const struct GNUNET_MESH_DataACK *msg)
3405 struct MeshReliableMessage *copy;
3406 struct MeshReliableMessage *next;
3413 bitfield = msg->futures;
3414 mid = ntohl (msg->mid);
3415 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3416 "free_sent_reliable %u %llX\n",
3418 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3419 " rel %p, head %p\n",
3420 rel, rel->head_sent);
3421 for (i = 0, copy = rel->head_sent;
3422 i < 64 && NULL != copy && 0 != bitfield;
3425 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3426 " trying bit %u (mid %u)\n",
3429 if (0 == (bitfield & mask))
3432 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " set!\n");
3433 /* Bit was set, clear the bit from the bitfield */
3436 /* The i-th bit was set. Do we have that copy? */
3437 /* Skip copies with mid < target */
3438 target = mid + i + 1;
3439 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " target %u\n", target);
3440 while (NULL != copy && GMC_is_pid_bigger (target, copy->mid))
3443 /* Did we run out of copies? (previously freed, it's ok) */
3446 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "run out of copies...\n");
3450 /* Did we overshoot the target? (previously freed, it's ok) */
3451 if (GMC_is_pid_bigger (copy->mid, target))
3453 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " next copy %u\n", copy->mid);
3457 /* Now copy->mid == target, free it */
3459 rel_message_free (copy);
3462 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "free_sent_reliable END\n");
3467 * We haven't received an ACK after a certain time: restransmit the message.
3469 * @param cls Closure (MeshReliableMessage with the message to restransmit)
3470 * @param tc TaskContext.
3473 channel_retransmit_message (void *cls,
3474 const struct GNUNET_SCHEDULER_TaskContext *tc)
3476 struct MeshChannelReliability *rel = cls;
3477 struct MeshReliableMessage *copy;
3478 struct MeshPeerQueue *q;
3479 struct MeshChannel *ch;
3480 struct MeshConnection *c;
3481 struct GNUNET_MESH_Data *payload;
3482 struct MeshPeer *hop;
3485 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
3486 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3490 copy = rel->head_sent;
3497 /* Search the message to be retransmitted in the outgoing queue.
3498 * Check only the queue for the connection that is going to be used,
3499 * if the message is stuck in some other connection's queue we shouldn't
3501 * - cancelling it and sending the new one doesn't guarantee it's delivery,
3502 * the old connection could be temporary stalled or the queue happened to
3503 * be long at time of insertion.
3504 * - not sending the new one could cause terrible delays the old connection
3507 payload = (struct GNUNET_MESH_Data *) ©[1];
3508 fwd = (rel == ch->fwd_rel);
3509 c = tunnel_get_connection (ch->t, fwd);
3510 hop = connection_get_hop (c, fwd);
3511 for (q = hop->queue_head; NULL != q; q = q->next)
3513 if (ntohs (payload->header.type) == q->type && ch == q->ch)
3515 struct GNUNET_MESH_Data *queued_data = q->cls;
3517 if (queued_data->mid == payload->mid)
3522 /* Message not found in the queue that we are going to use. */
3525 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RETRANSMIT %u\n", copy->mid);
3527 send_prebuilt_message_channel (&payload->header, ch, ch->fwd_rel == rel);
3528 GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO);
3532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! ALREADY IN QUEUE %u\n", copy->mid);
3535 rel->retry_timer = GNUNET_TIME_STD_BACKOFF (rel->retry_timer);
3536 rel->retry_task = GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
3537 &channel_retransmit_message,
3544 * Send ACK on one or more connections due to buffer space to the client.
3547 channel_send_ack (struct MeshChannel *ch, uint32_t buffer, int fwd)
3549 struct MeshTunnel2 *t = ch->t;
3550 struct MeshConnection *c;
3551 struct MeshFlowControl *fc;
3556 /* Count connections, how many messages are already allowed */
3557 for (cs = 0, allowed = 0, c = t->connection_head; NULL != c; c = c->next)
3559 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3560 if (GMC_is_pid_bigger(fc->last_pid_recv, fc->last_ack_sent))
3565 allowed += fc->last_ack_sent - fc->last_pid_recv;
3569 /* Make sure there is no overflow */
3570 if (allowed > buffer)
3576 /* Authorize connections to send more data */
3577 to_allow = buffer - allowed;
3578 for (c = t->connection_head; NULL != c && to_allow > 0; c = c->next)
3580 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3581 if (fc->last_ack_sent - fc->last_pid_recv > 64 / 3)
3585 send_ack (c, fc->last_ack_sent + 1, fwd);
3589 GNUNET_break (to_allow == 0);
3594 * Send keepalive packets for a connection.
3596 * @param c Connection to keep alive..
3597 * @param fwd Is this a FWD keepalive? (owner -> dest).
3600 connection_keepalive (struct MeshConnection *c, int fwd)
3602 struct GNUNET_MESH_ConnectionKeepAlive *msg;
3603 size_t size = sizeof (struct GNUNET_MESH_ConnectionKeepAlive);
3607 type = fwd ? GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE :
3608 GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE;
3610 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3611 "sending %s keepalive for connection %s[%d]\n",
3612 fwd ? "FWD" : "BCK",
3613 peer2s (c->t->peer),
3616 msg = (struct GNUNET_MESH_ConnectionKeepAlive *) cbuf;
3617 msg->header.size = htons (size);
3618 msg->header.type = htons (type);
3619 msg->cid = htonl (c->id);
3620 msg->tid = c->t->id;
3622 send_prebuilt_message_connection (&msg->header, c, NULL, fwd);
3627 * Send CONNECTION_{CREATE/ACK} packets for a connection.
3629 * @param c Connection for which to send the message.
3630 * @param fwd If GNUNET_YES, send CREATE, otherwise send ACK.
3633 connection_recreate (struct MeshConnection *c, int fwd)
3635 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "sending connection recreate\n");
3637 send_connection_create (c);
3639 send_connection_ack (c);
3644 * Generic connection timer management.
3645 * Depending on the role of the peer in the connection will send the
3646 * appropriate message (build or keepalive)
3648 * @param c Conncetion to maintain.
3649 * @param fwd Is FWD?
3652 connection_maintain (struct MeshConnection *c, int fwd)
3654 if (MESH_TUNNEL_SEARCHING == c->t->state)
3656 /* TODO DHT GET with RO_BART */
3661 case MESH_CONNECTION_NEW:
3663 case MESH_CONNECTION_SENT:
3664 connection_recreate (c, fwd);
3666 case MESH_CONNECTION_READY:
3667 connection_keepalive (c, fwd);
3676 connection_fwd_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3678 struct MeshConnection *c = cls;
3680 c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
3681 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3684 connection_maintain (c, GNUNET_YES);
3685 c->fwd_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
3686 &connection_fwd_keepalive,
3692 connection_bck_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3694 struct MeshConnection *c = cls;
3696 c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
3697 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3700 connection_maintain (c, GNUNET_NO);
3701 c->bck_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
3702 &connection_bck_keepalive,
3708 * Send a message to all peers in this connection that the connection
3709 * is no longer valid.
3711 * If some peer should not receive the message, it should be zero'ed out
3712 * before calling this function.
3714 * @param c The connection whose peers to notify.
3717 connection_send_destroy (struct MeshConnection *c)
3719 struct GNUNET_MESH_ConnectionDestroy msg;
3721 msg.header.size = htons (sizeof (msg));
3722 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);;
3723 msg.cid = htonl (c->id);
3725 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3726 " sending connection destroy for connection %s[%X]\n",
3727 peer2s (c->t->peer),
3730 send_prebuilt_message_connection (&msg.header, c, NULL, GNUNET_YES);
3731 send_prebuilt_message_connection (&msg.header, c, NULL, GNUNET_NO);
3732 c->destroy = GNUNET_YES;
3737 * Send a message to all clients (local and remote) of this channel
3738 * notifying that the channel is no longer valid.
3740 * If some peer or client should not receive the message,
3741 * should be zero'ed out before calling this function.
3743 * @param ch The channel whose clients to notify.
3746 channel_send_destroy (struct MeshChannel *ch)
3748 struct GNUNET_MESH_ChannelDestroy msg;
3750 msg.header.size = htons (sizeof (msg));
3751 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY);
3752 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3753 " sending channel destroy for channel %s:%X\n",
3754 peer2s (ch->t->peer),
3757 if (NULL != ch->root)
3759 msg.chid = htonl (ch->lid_root);
3760 send_local_channel_destroy (ch, GNUNET_NO);
3764 msg.chid = htonl (ch->gid);
3765 send_prebuilt_message_channel (&msg.header, ch, GNUNET_NO);
3768 if (NULL != ch->dest)
3770 msg.chid = htonl (ch->lid_dest);
3771 send_local_channel_destroy (ch, GNUNET_YES);
3775 msg.chid = htonl (ch->gid);
3776 send_prebuilt_message_channel (&msg.header, ch, GNUNET_YES);
3784 * @param tid Tunnel ID.
3786 static struct MeshTunnel2 *
3787 tunnel_new (const struct GNUNET_HashCode *tid)
3789 struct MeshTunnel2 *t;
3791 t = GNUNET_new (struct MeshTunnel2);
3793 t->next_chid = GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
3795 GNUNET_CONTAINER_multihashmap_put (tunnels, tid, t,
3796 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
3810 * @param tid Tunnel ID.
3812 static struct MeshTunnel2 *
3813 tunnel_get (const struct GNUNET_HashCode *tid)
3815 return GNUNET_CONTAINER_multihashmap_get (tunnels, tid);
3820 * Add a connection to a tunnel.
3823 * @param c Connection.
3826 tunnel_add_connection (struct MeshTunnel2 *t, struct MeshConnection *c)
3829 GNUNET_CONTAINER_DLL_insert_tail (t->connection_head, t->connection_tail, c);
3834 * Initialize a Flow Control structure to the initial state.
3836 * @param fc Flow Control structure to initialize.
3839 fc_init (struct MeshFlowControl *fc)
3841 fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
3842 fc->last_pid_recv = (uint32_t) -1;
3843 fc->last_ack_sent = (uint32_t) 0;
3844 fc->last_ack_recv = (uint32_t) 0;
3845 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
3846 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
3848 fc->queue_max = (max_msgs_queue / max_connections) + 1;
3852 static struct MeshConnection *
3853 connection_new (struct GNUNET_HashCode *tid, uint32_t cid)
3855 struct MeshConnection *c;
3856 struct MeshTunnel2 *t;
3858 t = tunnel_get (tid);
3861 t = tunnel_new (tid);
3869 c = GNUNET_new (struct MeshConnection);
3871 fc_init (&c->fwd_fc);
3872 fc_init (&c->bck_fc);
3873 tunnel_add_connection (t, c);
3880 * Find a connection.
3882 * @param tid Tunnel ID.
3883 * @param cid Connection ID.
3885 static struct MeshConnection *
3886 connection_get (const struct GNUNET_HashCode *tid, uint32_t cid)
3888 struct MeshConnection *c;
3889 struct MeshTunnel2 *t;
3891 t = tunnel_get (tid);
3894 for (c = t->connection_head; NULL != c; c = c->next)
3903 connection_destroy (struct MeshConnection *c)
3908 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying connection %s[%X]\n",
3909 peer2s (c->t->peer),
3912 connection_cancel_queues (c, GNUNET_YES);
3913 connection_cancel_queues (c, GNUNET_NO);
3915 if (GNUNET_SCHEDULER_NO_TASK != c->fwd_maintenance_task)
3916 GNUNET_SCHEDULER_cancel (c->fwd_maintenance_task);
3917 if (GNUNET_SCHEDULER_NO_TASK != c->bck_maintenance_task)
3918 GNUNET_SCHEDULER_cancel (c->bck_maintenance_task);
3920 GNUNET_CONTAINER_DLL_remove (c->t->connection_head, c->t->connection_tail, c);
3922 GNUNET_STATISTICS_update (stats, "# connections", -1, GNUNET_NO);
3928 tunnel_destroy (struct MeshTunnel2 *t)
3930 struct MeshConnection *c;
3931 struct MeshConnection *next;
3936 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n",
3939 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &t->id, t))
3942 for (c = t->connection_head; NULL != c; c = next)
3945 connection_destroy (c);
3948 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
3955 * Tunnel is empty: destroy it.
3957 * Notifies all connections about the destruction.
3959 * @param t Tunnel to destroy.
3962 tunnel_destroy_empty (struct MeshTunnel2 *t)
3964 struct MeshConnection *c;
3966 for (c = t->connection_head; NULL != c; c = c->next)
3968 if (GNUNET_NO == c->destroy)
3969 connection_send_destroy (c);
3972 if (0 == t->pending_messages)
3975 t->destroy = GNUNET_YES;
3980 * Destroy tunnel if empty (no more channels).
3982 * @param t Tunnel to destroy if empty.
3985 tunnel_destroy_if_empty (struct MeshTunnel2 *t)
3987 if (NULL != t->channel_head)
3990 tunnel_destroy_empty (t);
3995 * Destroy a channel and free all resources.
3997 * @param ch Channel to destroy.
4000 channel_destroy (struct MeshChannel *ch)
4002 struct MeshClient *c;
4010 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap32_remove (c->own_channels,
4021 GNUNET_CONTAINER_multihashmap32_remove (c->incoming_channels,
4028 if (GNUNET_YES == ch->reliable)
4030 channel_rel_free_all (ch->fwd_rel);
4031 channel_rel_free_all (ch->bck_rel);
4034 GNUNET_CONTAINER_DLL_remove (ch->t->channel_head, ch->t->channel_tail, ch);
4035 GNUNET_STATISTICS_update (stats, "# channels", -1, GNUNET_NO);
4041 * Create a new channel.
4043 * @param t Tunnel this channel is in.
4044 * @param owner Client that owns the channel, NULL for foreign channels.
4045 * @param lid_root Local ID for root client.
4047 * @return A new initialized channel. NULL on error.
4049 static struct MeshChannel *
4050 channel_new (struct MeshTunnel2 *t,
4051 struct MeshClient *owner, MESH_ChannelNumber lid_root)
4053 struct MeshChannel *ch;
4055 ch = GNUNET_new (struct MeshChannel);
4057 ch->lid_root = lid_root;
4060 GNUNET_CONTAINER_DLL_insert (t->channel_head, t->channel_tail, ch);
4062 GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
4066 while (NULL != channel_get_by_local_id (owner, t->next_chid))
4067 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
4068 ch->gid = t->next_chid;
4069 t->next_chid = (t->next_chid + 1) & ~GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
4072 GNUNET_CONTAINER_multihashmap32_put (owner->own_channels, lid_root, ch,
4073 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
4076 channel_destroy (ch);
4077 GNUNET_SERVER_receive_done (owner->handle, GNUNET_SYSERR);
4087 * Set options in a channel, extracted from a bit flag field
4089 * @param ch Channel to set options to.
4090 * @param options Bit array in host byte order.
4093 channel_set_options (struct MeshChannel *ch, uint32_t options)
4095 ch->nobuffer = (options & GNUNET_MESH_OPTION_NOBUFFER) != 0 ?
4096 GNUNET_YES : GNUNET_NO;
4097 ch->reliable = (options & GNUNET_MESH_OPTION_RELIABLE) != 0 ?
4098 GNUNET_YES : GNUNET_NO;
4103 * Iterator for deleting each channel whose client endpoint disconnected.
4105 * @param cls Closure (client that has disconnected).
4106 * @param key The local channel id (used to access the hashmap).
4107 * @param value The value stored at the key (channel to destroy).
4109 * @return GNUNET_OK, keep iterating.
4112 channel_destroy_iterator (void *cls,
4116 struct MeshChannel *ch = value;
4117 struct MeshClient *c = cls;
4118 struct MeshTunnel2 *t;
4120 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4121 " Channel %X (%X / %X) destroy, due to client %u shutdown.\n",
4122 ch->gid, ch->lid_root, ch->lid_dest, c->id);
4126 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is destination.\n", c->id);
4131 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is owner.\n", c->id);
4136 channel_send_destroy (ch);
4137 channel_destroy (ch);
4138 tunnel_destroy_if_empty (t);
4145 * Remove client's ports from the global hashmap on disconnect.
4147 * @param cls Closure (unused).
4149 * @param value Client structure.
4151 * @return GNUNET_OK, keep iterating.
4154 client_release_ports (void *cls,
4160 res = GNUNET_CONTAINER_multihashmap32_remove (ports, key, value);
4161 if (GNUNET_YES != res)
4164 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4165 "Port %u by client %p was not registered.\n",
4173 * Timeout function due to lack of keepalive/traffic from the owner.
4174 * Destroys connection if called.
4176 * @param cls Closure (connection to destroy).
4177 * @param tc TaskContext.
4180 connection_fwd_timeout (void *cls,
4181 const struct GNUNET_SCHEDULER_TaskContext *tc)
4183 struct MeshConnection *c = cls;
4185 c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4186 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
4188 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4189 "Connection %s[%X] FWD timed out. Destroying.\n",
4190 peer2s (c->t->peer),
4193 if (connection_is_terminal (c, GNUNET_NO)) /* If local, leave. */
4196 connection_destroy (c);
4201 * Timeout function due to lack of keepalive/traffic from the destination.
4202 * Destroys connection if called.
4204 * @param cls Closure (connection to destroy).
4205 * @param tc TaskContext
4208 connection_bck_timeout (void *cls,
4209 const struct GNUNET_SCHEDULER_TaskContext *tc)
4211 struct MeshConnection *c = cls;
4213 c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4214 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
4217 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4218 "Connection %s[%X] FWD timed out. Destroying.\n",
4219 peer2s (c->t->peer),
4222 if (connection_is_terminal (c, GNUNET_YES)) /* If local, leave. */
4225 connection_destroy (c);
4230 * Resets the connection timeout task, some other message has done the
4232 * - For the first peer on the direction this means to send
4233 * a keepalive or a path confirmation message (either create or ACK).
4234 * - For all other peers, this means to destroy the connection,
4235 * due to lack of activity.
4236 * Starts the tiemout if no timeout was running (connection just created).
4238 * @param c Connection whose timeout to reset.
4239 * @param fwd Is this forward?
4241 * TODO use heap to improve efficiency of scheduler.
4244 connection_reset_timeout (struct MeshConnection *c, int fwd)
4246 GNUNET_SCHEDULER_TaskIdentifier *ti;
4247 GNUNET_SCHEDULER_Task f;
4249 ti = fwd ? &c->fwd_maintenance_task : &c->bck_maintenance_task;
4251 if (GNUNET_SCHEDULER_NO_TASK != *ti)
4252 GNUNET_SCHEDULER_cancel (*ti);
4254 if (connection_is_terminal (c, !fwd)) /* Endpoint */
4256 f = fwd ? &connection_fwd_keepalive : &connection_bck_keepalive;
4257 *ti = GNUNET_SCHEDULER_add_delayed (refresh_connection_time, f, c);
4261 struct GNUNET_TIME_Relative delay;
4263 delay = GNUNET_TIME_relative_multiply (refresh_connection_time, 4);
4264 f = fwd ? &connection_fwd_timeout : &connection_bck_timeout;
4265 *ti = GNUNET_SCHEDULER_add_delayed (delay, f, c);
4271 * Iterator to notify all connections of a broken link. Mark connections
4272 * to destroy after all traffic has been sent.
4274 * @param cls Closure (peer disconnected).
4275 * @param key Current key code (tid).
4276 * @param value Value in the hash map (connection).
4278 * @return GNUNET_YES if we should continue to iterate,
4282 connection_broken (void *cls,
4283 const struct GNUNET_HashCode *key,
4286 struct MeshPeer *peer = cls;
4287 struct MeshConnection *c = value;
4288 struct GNUNET_MESH_ConnectionBroken msg;
4291 fwd = peer == connection_get_prev_hop (c);
4292 connection_cancel_queues (c, !fwd);
4294 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectionBroken));
4295 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN);
4296 msg.cid = htonl (c->id);
4298 msg.peer1 = my_full_id;
4299 msg.peer2 = *GNUNET_PEER_resolve2 (peer->id);
4300 send_prebuilt_message_connection (&msg.header, c, NULL, fwd);
4301 c->destroy = GNUNET_YES;
4306 /******************************************************************************/
4307 /**************** MESH NETWORK HANDLER HELPERS ***********************/
4308 /******************************************************************************/
4311 * Free a transmission that was already queued with all resources
4312 * associated to the request.
4314 * @param queue Queue handler to cancel.
4315 * @param clear_cls Is it necessary to free associated cls?
4318 queue_destroy (struct MeshPeerQueue *queue, int clear_cls)
4320 struct MeshPeer *peer;
4321 struct MeshFlowControl *fc;
4326 fc = fwd ? &queue->c->fwd_fc : &queue->c->bck_fc;
4328 if (GNUNET_YES == clear_cls)
4330 switch (queue->type)
4332 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY:
4333 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "destroying CONNECTION_DESTROY\n");
4334 GNUNET_break (GNUNET_YES == queue->c->destroy);
4336 case GNUNET_MESSAGE_TYPE_MESH_FWD:
4337 case GNUNET_MESSAGE_TYPE_MESH_BCK:
4338 case GNUNET_MESSAGE_TYPE_MESH_ACK:
4339 case GNUNET_MESSAGE_TYPE_MESH_POLL:
4340 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
4341 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " prebuilt message\n");
4342 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type %s\n",
4343 GNUNET_MESH_DEBUG_M2S (queue->type));
4346 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
4347 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type create path\n");
4352 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n",
4353 GNUNET_MESH_DEBUG_M2S (queue->type));
4355 GNUNET_free_non_null (queue->cls);
4357 GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue);
4361 if (NULL != queue->c)
4363 queue->c->pending_messages--;
4364 if (NULL != queue->c->t)
4366 queue->c->t->pending_messages--;
4370 GNUNET_free (queue);
4375 queue_send (void *cls, size_t size, void *buf)
4377 struct MeshPeer *peer = cls;
4378 struct MeshFlowControl *fc;
4379 struct MeshConnection *c;
4380 struct GNUNET_MessageHeader *msg;
4381 struct MeshPeerQueue *queue;
4382 struct MeshTunnel2 *t;
4383 const struct GNUNET_PeerIdentity *dst_id;
4389 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Queue send\n");
4391 if (NULL == buf || 0 == size)
4393 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Buffer size 0.\n");
4398 queue = peer_get_first_message (peer);
4401 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
4404 queue->peer->core_transmit = NULL;
4407 fc = fwd ? &c->fwd_fc : &c->bck_fc;
4410 dst_id = GNUNET_PEER_resolve2 (peer->id);
4411 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* towards %s\n", GNUNET_i2s (dst_id));
4412 /* Check if buffer size is enough for the message */
4413 if (queue->size > size)
4415 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not enough room, reissue\n");
4416 peer->core_transmit =
4417 GNUNET_CORE_notify_transmit_ready (core_handle,
4420 GNUNET_TIME_UNIT_FOREVER_REL,
4427 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* size ok\n");
4429 t = (NULL != c) ? c->t : NULL;
4433 switch (queue->type)
4435 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY:
4436 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
4437 case GNUNET_MESSAGE_TYPE_MESH_FWD:
4438 case GNUNET_MESSAGE_TYPE_MESH_BCK:
4439 case GNUNET_MESSAGE_TYPE_MESH_ACK:
4440 case GNUNET_MESSAGE_TYPE_MESH_POLL:
4441 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4443 GNUNET_MESH_DEBUG_M2S (queue->type));
4445 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
4446 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
4447 data_size = send_core_data_raw (queue->cls, size, buf);
4448 msg = (struct GNUNET_MessageHeader *) buf;
4449 type = ntohs (msg->type);
4451 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
4452 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path create\n");
4453 if (connection_is_terminal (c, GNUNET_NO))
4454 data_size = send_core_connection_create (queue->cls, size, buf);
4456 data_size = send_core_data_raw (queue->cls, size, buf);
4458 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
4459 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n");
4460 if (connection_is_terminal (c, GNUNET_YES))
4461 data_size = send_core_connection_ack (queue->cls, size, buf);
4463 data_size = send_core_data_raw (queue->cls, size, buf);
4467 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "* type unknown: %u\n",
4472 if (0 < drop_percent &&
4473 GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
4475 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4476 "Dropping message of type %s\n",
4477 GNUNET_MESH_DEBUG_M2S (queue->type));
4480 /* Free queue, but cls was freed by send_core_* */
4481 queue_destroy (queue, GNUNET_NO);
4483 /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
4486 case GNUNET_MESSAGE_TYPE_MESH_FWD:
4487 case GNUNET_MESSAGE_TYPE_MESH_BCK:
4488 pid = ntohl ( ((struct GNUNET_MESH_Encrypted *) buf)->pid );
4489 fc->last_pid_sent = pid;
4490 connection_send_ack (c, fwd);
4496 /* If more data in queue, send next */
4497 queue = peer_get_first_message (peer);
4500 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* more data!\n");
4501 if (NULL == peer->core_transmit) {
4502 peer->core_transmit =
4503 GNUNET_CORE_notify_transmit_ready(core_handle,
4506 GNUNET_TIME_UNIT_FOREVER_REL,
4514 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4515 "* tmt rdy called somewhere else\n");
4517 if (GNUNET_SCHEDULER_NO_TASK == fc->poll_task)
4519 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "* %s starting poll timeout\n");
4521 GNUNET_SCHEDULER_add_delayed (fc->poll_time, &connection_poll, fc);
4526 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
4528 GNUNET_SCHEDULER_cancel (fc->poll_task);
4529 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
4534 c->pending_messages--;
4535 if (GNUNET_YES == c->destroy && 0 == c->pending_messages)
4537 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying connection!\n");
4538 connection_destroy (c);
4544 t->pending_messages--;
4545 if (GNUNET_YES == t->destroy && 0 == t->pending_messages)
4547 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying tunnel!\n");
4551 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Return %d\n", data_size);
4557 queue_add (void *cls, uint16_t type, size_t size,
4558 struct MeshPeer *dst,
4559 struct MeshConnection *c,
4560 struct MeshChannel *ch)
4562 struct MeshPeerQueue *queue;
4563 struct MeshFlowControl *fc;
4567 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4568 "queue add %s (%u bytes) on c %p, ch %p\n",
4569 GNUNET_MESH_DEBUG_M2S (type), size, c, ch);
4571 fwd = (dst == connection_get_next_hop (c));
4572 fc = fwd ? &c->fwd_fc : &c->bck_fc;
4582 if (GNUNET_MESSAGE_TYPE_MESH_POLL == type ||
4583 GNUNET_MESSAGE_TYPE_MESH_ACK == type)
4587 ( (NULL != ch->root && GNUNET_MESSAGE_TYPE_MESH_FWD == type) ||
4588 (NULL != ch->dest && GNUNET_MESSAGE_TYPE_MESH_BCK == type) ))
4591 if (fc->queue_n >= fc->queue_max && 0 == priority)
4593 GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)",
4596 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4597 "queue full: %u/%u\n",
4598 fc->queue_n, fc->queue_max);
4599 return; /* Drop this message */
4602 if (GMC_is_pid_bigger(fc->last_pid_sent + 1, fc->last_ack_recv) &&
4603 GNUNET_SCHEDULER_NO_TASK == fc->poll_task)
4604 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
4607 queue = GNUNET_malloc (sizeof (struct MeshPeerQueue));
4615 if (100 <= priority)
4616 GNUNET_CONTAINER_DLL_insert (dst->queue_head, dst->queue_tail, queue);
4618 GNUNET_CONTAINER_DLL_insert_tail (dst->queue_head, dst->queue_tail, queue);
4620 if (NULL == dst->core_transmit)
4622 dst->core_transmit =
4623 GNUNET_CORE_notify_transmit_ready (core_handle,
4626 GNUNET_TIME_UNIT_FOREVER_REL,
4627 GNUNET_PEER_resolve2 (dst->id),
4632 c->pending_messages++;
4633 c->t->pending_messages++;
4639 /******************************************************************************/
4640 /******************** MESH NETWORK HANDLERS **************************/
4641 /******************************************************************************/
4645 * Generic handler for mesh network payload traffic.
4647 * @param t Tunnel on which we got this message.
4648 * @param message Unencryted data message.
4649 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
4651 * @return GNUNET_OK to keep the connection open,
4652 * GNUNET_SYSERR to close it (signal serious error)
4655 handle_data (struct MeshTunnel2 *t, const struct GNUNET_MESH_Data *msg, int fwd)
4657 struct MeshChannelReliability *rel;
4658 struct MeshChannel *ch;
4659 struct MeshClient *c;
4666 size = ntohs (msg->header.size);
4668 sizeof (struct GNUNET_MESH_Data) +
4669 sizeof (struct GNUNET_MessageHeader))
4674 type = ntohs (msg->header.type);
4675 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message\n",
4676 GNUNET_MESH_DEBUG_M2S (type));
4677 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
4678 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
4681 ch = channel_get (t, ntohl (msg->chid));
4684 GNUNET_STATISTICS_update (stats, "# data on unknown channel", 1, GNUNET_NO);
4685 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel unknown\n");
4689 /* Initialize FWD/BCK data */
4690 c = fwd ? ch->dest : ch->root;
4691 rel = fwd ? ch->bck_rel : ch->fwd_rel;
4692 mid_recv = fwd ? &ch->mid_recv_fwd : &ch->mid_recv_bck;
4700 tunnel_change_state (t, MESH_TUNNEL_READY);
4702 GNUNET_STATISTICS_update (stats, "# data received", 1, GNUNET_NO);
4704 mid = ntohl (msg->mid);
4705 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " mid %u\n", mid);
4707 if (GNUNET_NO == ch->reliable ||
4708 ( !GMC_is_pid_bigger (*mid_recv, mid) &&
4709 GMC_is_pid_bigger (*mid_recv + 64, mid) ) )
4711 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RECV %u\n", mid);
4712 if (GNUNET_YES == ch->reliable)
4714 /* Is this the exact next expected messasge? */
4715 if (mid == *mid_recv)
4717 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "as expected\n");
4718 *mid_recv = *mid_recv + 1;
4719 channel_send_client_data (ch, msg, fwd);
4720 channel_send_client_buffered_data (ch, c, rel);
4724 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "save for later\n");
4725 channel_rel_add_buffered_data (msg, rel);
4728 else /* Tunnel unreliable, send to clients directly */
4730 channel_send_client_data (ch, msg, fwd);
4735 GNUNET_break_op (0);
4736 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4737 " MID %u not expected (%u - %u), dropping!\n",
4738 mid, *mid_recv, *mid_recv + 64);
4741 channel_send_data_ack (ch, fwd);
4746 * Handler for mesh network traffic end-to-end ACKs.
4748 * @param t Tunnel on which we got this message.
4749 * @param message Data message.
4750 * @param fwd Is this a fwd ACK? (dest->orig)
4752 * @return GNUNET_OK to keep the connection open,
4753 * GNUNET_SYSERR to close it (signal serious error)
4756 handle_data_ack (struct MeshTunnel2 *t,
4757 const struct GNUNET_MESH_DataACK *msg, int fwd)
4759 struct MeshChannelReliability *rel;
4760 struct MeshReliableMessage *copy;
4761 struct MeshReliableMessage *next;
4762 struct MeshChannel *ch;
4767 type = ntohs (msg->header.type);
4768 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a %s message!\n",
4769 GNUNET_MESH_DEBUG_M2S (type));
4770 ch = channel_get (t, ntohl (msg->chid));
4773 GNUNET_STATISTICS_update (stats, "# ack on unknown channel", 1, GNUNET_NO);
4776 ack = ntohl (msg->mid);
4777 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! %s ACK %u\n",
4778 (GNUNET_YES == fwd) ? "FWD" : "BCK", ack);
4780 if (GNUNET_YES == fwd)
4793 for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next)
4795 if (GMC_is_pid_bigger (copy->mid, ack))
4797 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! head %u, out!\n", copy->mid);
4798 channel_rel_free_sent (rel, msg);
4802 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! id %u\n", copy->mid);
4804 rel_message_free (copy);
4806 /* ACK client if needed */
4807 // channel_send_ack (t, type, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK == type);
4809 /* If some message was free'd, update the retransmission delay*/
4810 if (GNUNET_YES == work)
4812 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
4814 GNUNET_SCHEDULER_cancel (rel->retry_task);
4815 if (NULL == rel->head_sent)
4817 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
4821 struct GNUNET_TIME_Absolute new_target;
4822 struct GNUNET_TIME_Relative delay;
4824 delay = GNUNET_TIME_relative_multiply (rel->retry_timer,
4825 MESH_RETRANSMIT_MARGIN);
4826 new_target = GNUNET_TIME_absolute_add (rel->head_sent->timestamp,
4828 delay = GNUNET_TIME_absolute_get_remaining (new_target);
4830 GNUNET_SCHEDULER_add_delayed (delay,
4831 &channel_retransmit_message,
4843 * Core handler for connection creation.
4845 * @param cls Closure (unused).
4846 * @param peer Sender (neighbor).
4847 * @param message Message.
4849 * @return GNUNET_OK to keep the connection open,
4850 * GNUNET_SYSERR to close it (signal serious error)
4853 handle_mesh_connection_create (void *cls,
4854 const struct GNUNET_PeerIdentity *peer,
4855 const struct GNUNET_MessageHeader *message)
4857 struct GNUNET_MESH_ConnectionCreate *msg;
4858 struct GNUNET_PeerIdentity *id;
4859 struct GNUNET_HashCode *tid;
4860 struct MeshPeerPath *path;
4861 struct MeshPeer *dest_peer;
4862 struct MeshPeer *orig_peer;
4863 struct MeshConnection *c;
4864 unsigned int own_pos;
4869 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a connection create msg\n");
4872 size = ntohs (message->size);
4873 if (size < sizeof (struct GNUNET_MESH_ConnectionCreate))
4875 GNUNET_break_op (0);
4879 /* Calculate hops */
4880 size -= sizeof (struct GNUNET_MESH_ConnectionCreate);
4881 if (size % sizeof (struct GNUNET_PeerIdentity))
4883 GNUNET_break_op (0);
4886 size /= sizeof (struct GNUNET_PeerIdentity);
4889 GNUNET_break_op (0);
4892 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
4894 /* Get parameters */
4895 msg = (struct GNUNET_MESH_ConnectionCreate *) message;
4896 cid = ntohl (msg->cid);
4898 id = (struct GNUNET_PeerIdentity *) &msg[1];
4899 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4900 " connection %s[%X] (%s).\n",
4901 GNUNET_h2s (tid), cid, GNUNET_i2s (id));
4903 /* Create connection */
4904 c = connection_get (tid, cid);
4907 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating connection\n");
4908 c = connection_new (tid, cid);
4912 connection_reset_timeout (c, GNUNET_YES);
4913 tunnel_change_state (c->t, MESH_TUNNEL_WAITING);
4915 /* Remember peers */
4916 dest_peer = peer_get (&id[size - 1]);
4917 orig_peer = peer_get (&id[0]);
4920 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
4921 path = path_new (size);
4923 for (i = 0; i < size; i++)
4925 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n",
4926 GNUNET_i2s (&id[i]));
4927 path->peers[i] = GNUNET_PEER_intern (&id[i]);
4928 if (path->peers[i] == myid)
4931 if (own_pos == 0 && path->peers[own_pos] != myid)
4933 /* create path: self not found in path through self */
4934 GNUNET_break_op (0);
4935 path_destroy (path);
4936 connection_destroy (c);
4939 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
4940 path_add_to_peers (path, GNUNET_NO);
4941 c->path = path_duplicate (path);
4942 c->own_pos = own_pos;
4944 /* Is it a connection to us? */
4945 if (own_pos == size - 1)
4947 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
4948 peer_add_path_to_origin (orig_peer, path, GNUNET_YES);
4950 send_connection_ack (c);
4952 /* Keep tunnel alive in direction dest->owner*/
4953 connection_reset_timeout (c, GNUNET_NO);
4957 /* It's for somebody else! Retransmit. */
4958 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
4959 peer_add_path (dest_peer, path_duplicate (path), GNUNET_NO);
4960 peer_add_path_to_origin (orig_peer, path, GNUNET_NO);
4961 send_prebuilt_message_connection (message, c, NULL, GNUNET_YES);
4968 * Core handler for path ACKs
4970 * @param cls closure
4971 * @param message message
4972 * @param peer peer identity this notification is about
4974 * @return GNUNET_OK to keep the connection open,
4975 * GNUNET_SYSERR to close it (signal serious error)
4978 handle_mesh_connection_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
4979 const struct GNUNET_MessageHeader *message)
4981 struct GNUNET_MESH_ConnectionACK *msg;
4982 struct MeshPeerPath *p;
4983 struct MeshConnection *c;
4986 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a connection ACK msg\n");
4987 msg = (struct GNUNET_MESH_ConnectionACK *) message;
4988 cid = ntohl(msg->cid);
4989 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on connection %s[%X]\n",
4990 GNUNET_h2s (&msg->tid), cid);
4991 c = connection_get (&msg->tid, cid);
4994 GNUNET_STATISTICS_update (stats, "# control on unknown connection",
4996 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't know the connection!\n");
5000 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n",
5003 /* Add path to peers? */
5007 path_add_to_peers (p, GNUNET_YES);
5013 connection_change_state (c, MESH_CONNECTION_READY);
5014 connection_reset_timeout (c, GNUNET_NO);
5015 if (MESH_TUNNEL_READY != c->t->state)
5016 tunnel_change_state (c->t, MESH_TUNNEL_READY);
5017 tunnel_send_queued_data (c->t, GNUNET_YES);
5019 /* Message for us? */
5020 if (connection_is_terminal (c, GNUNET_NO))
5022 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
5023 if (3 <= tunnel_count_connections (c->t) && NULL != c->t->peer->dhtget)
5025 GNUNET_DHT_get_stop (c->t->peer->dhtget);
5026 c->t->peer->dhtget = NULL;
5028 //connection_send_ack (c, GNUNET_NO); /* FIXME */
5032 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
5033 send_prebuilt_message_connection (message, c, NULL, GNUNET_NO);
5039 * Core handler for notifications of broken paths
5041 * @param cls Closure (unused).
5042 * @param peer Peer identity of sending neighbor.
5043 * @param message Message.
5045 * @return GNUNET_OK to keep the connection open,
5046 * GNUNET_SYSERR to close it (signal serious error)
5049 handle_mesh_connection_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
5050 const struct GNUNET_MessageHeader *message)
5052 struct GNUNET_MESH_ConnectionBroken *msg;
5053 struct MeshConnection *c;
5055 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5056 "Received a CONNECTION BROKEN msg from %s\n", GNUNET_i2s (peer));
5057 msg = (struct GNUNET_MESH_ConnectionBroken *) message;
5058 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
5059 GNUNET_i2s (&msg->peer1));
5060 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
5061 GNUNET_i2s (&msg->peer2));
5062 c = connection_get (&msg->tid, ntohl (msg->cid));
5065 GNUNET_break_op (0);
5068 tunnel_notify_connection_broken (c->t, GNUNET_PEER_search (&msg->peer1),
5069 GNUNET_PEER_search (&msg->peer2));
5076 * Core handler for tunnel destruction
5078 * @param cls Closure (unused).
5079 * @param peer Peer identity of sending neighbor.
5080 * @param message Message.
5082 * @return GNUNET_OK to keep the connection open,
5083 * GNUNET_SYSERR to close it (signal serious error)
5086 handle_mesh_connection_destroy (void *cls,
5087 const struct GNUNET_PeerIdentity *peer,
5088 const struct GNUNET_MessageHeader *message)
5090 struct GNUNET_MESH_ConnectionDestroy *msg;
5091 struct MeshConnection *c;
5095 msg = (struct GNUNET_MESH_ConnectionDestroy *) message;
5096 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5097 "Got a CONNECTION DESTROY message from %s\n",
5099 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5100 " for connection %s[%X]\n",
5101 GNUNET_h2s (&msg->tid), ntohl (msg->cid));
5102 c = connection_get (&msg->tid, ntohl (msg->cid));
5105 /* Probably already got the message from another path,
5106 * destroyed the tunnel and retransmitted to children.
5109 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel",
5113 id = GNUNET_PEER_search (peer);
5114 if (id == connection_get_prev_hop (c)->id)
5116 else if (id == connection_get_next_hop (c)->id)
5120 GNUNET_break_op (0);
5123 send_prebuilt_message_connection (message, c, NULL, fwd);
5124 c->destroy = GNUNET_YES;
5130 * Handler for channel create messages.
5132 * @param t Tunnel this channel is to be created in.
5133 * @param msg Message.
5134 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
5136 * @return GNUNET_OK to keep the connection open,
5137 * GNUNET_SYSERR to close it (signal serious error)
5140 handle_channel_create (struct MeshTunnel2 *t,
5141 struct GNUNET_MESH_ChannelCreate *msg,
5144 MESH_ChannelNumber chid;
5145 struct MeshChannel *ch;
5146 struct MeshClient *c;
5148 /* Check message size */
5149 if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelCreate))
5151 GNUNET_break_op (0);
5155 /* Check if channel exists */
5156 chid = ntohl (msg->chid);
5157 ch = channel_get (t, chid);
5160 /* Probably a retransmission, safe to ignore */
5164 /* Find a destination client */
5165 c = GNUNET_CONTAINER_multihashmap32_get (ports, msg->port);
5168 /* TODO send reject */
5172 /* Create channel */
5173 ch = channel_new (t, NULL, 0);
5174 channel_set_options (ch, ntohl (msg->opt));
5175 channel_add_client (ch, c);
5176 if (GNUNET_YES == ch->reliable)
5178 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
5179 ch->bck_rel = GNUNET_malloc (sizeof (struct MeshChannelReliability));
5180 ch->bck_rel->ch = ch;
5181 ch->bck_rel->expected_delay = MESH_RETRANSMIT_TIME;
5184 send_local_channel_create (ch);
5191 * Handler for channel destroy messages.
5193 * @param t Tunnel this channel is to be destroyed of.
5194 * @param msg Message.
5195 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
5197 * @return GNUNET_OK to keep the connection open,
5198 * GNUNET_SYSERR to close it (signal serious error)
5201 handle_channel_destroy (struct MeshTunnel2 *t,
5202 struct GNUNET_MESH_ChannelDestroy *msg,
5205 MESH_ChannelNumber chid;
5206 struct MeshChannel *ch;
5208 /* Check message size */
5209 if (ntohs (msg->header.size) != sizeof (struct GNUNET_MESH_ChannelDestroy))
5211 GNUNET_break_op (0);
5215 /* Check if channel exists */
5216 chid = ntohl (msg->chid);
5217 ch = channel_get (t, chid);
5220 /* Probably a retransmission, safe to ignore */
5224 send_local_channel_destroy (ch, fwd);
5225 channel_destroy (ch);
5232 * Generic handler for mesh network encrypted traffic.
5234 * @param peer Peer identity this notification is about.
5235 * @param message Encrypted message.
5236 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
5238 * @return GNUNET_OK to keep the connection open,
5239 * GNUNET_SYSERR to close it (signal serious error)
5242 handle_mesh_encrypted (const struct GNUNET_PeerIdentity *peer,
5243 const struct GNUNET_MESH_Encrypted *msg,
5246 struct MeshConnection *c;
5247 struct MeshTunnel2 *t;
5248 struct MeshPeer *neighbor;
5249 struct MeshFlowControl *fc;
5256 size = ntohs (msg->header.size);
5258 sizeof (struct GNUNET_MESH_Encrypted) +
5259 sizeof (struct GNUNET_MessageHeader))
5264 type = ntohs (msg->header.type);
5265 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message from %s\n",
5266 GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer));
5268 /* Check connection */
5269 c = connection_get (&msg->tid, ntohl (msg->cid));
5272 GNUNET_STATISTICS_update (stats, "# unknown connection", 1, GNUNET_NO);
5273 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING connection unknown\n");
5277 fc = fwd ? &c->fwd_fc : &c->bck_fc;
5279 /* Check if origin is as expected */
5280 neighbor = connection_get_hop (c, fwd);
5281 if (peer_get (peer)->id != neighbor->id)
5283 GNUNET_break_op (0);
5288 pid = ntohl (msg->pid);
5289 if (GMC_is_pid_bigger (pid, fc->last_ack_sent))
5291 GNUNET_STATISTICS_update (stats, "# unsolicited message", 1, GNUNET_NO);
5292 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5293 "WARNING Received PID %u, (prev %u), ACK %u\n",
5294 pid, fc->last_pid_recv, fc->last_ack_sent);
5297 if (GNUNET_NO == GMC_is_pid_bigger (pid, fc->last_pid_recv))
5299 GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO);
5300 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5301 " Pid %u not expected (%u+), dropping!\n",
5302 pid, fc->last_pid_recv + 1);
5305 if (MESH_CONNECTION_SENT == c->state)
5306 connection_change_state (c, MESH_CONNECTION_READY);
5307 connection_reset_timeout (c, fwd);
5308 fc->last_pid_recv = pid;
5310 /* Is this message for us? */
5311 if (connection_is_terminal (c, fwd))
5313 size_t dsize = size - sizeof (struct GNUNET_MESH_Encrypted);
5315 struct GNUNET_MessageHeader *msgh;
5317 /* TODO signature verification */
5318 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " it's for us!\n");
5319 GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO);
5321 fc->last_pid_recv = pid;
5322 tunnel_decrypt (t, cbuf, &msg[1], dsize, msg->iv, fwd);
5323 msgh = (struct GNUNET_MessageHeader *) cbuf;
5324 switch (ntohs (msgh->type))
5326 case GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK:
5327 if (GNUNET_YES == fwd)
5328 return handle_data_ack (t, (struct GNUNET_MESH_DataACK *) msgh,
5330 GNUNET_break_op (0);
5332 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK:
5333 if (GNUNET_NO == fwd)
5334 return handle_data_ack (t, (struct GNUNET_MESH_DataACK *) msgh,
5336 GNUNET_break_op (0);
5338 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
5339 if (GNUNET_YES == fwd)
5340 handle_data (t, (struct GNUNET_MESH_Data *) msgh, GNUNET_YES);
5341 GNUNET_break_op (0);
5343 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
5344 if (GNUNET_NO == fwd)
5345 handle_data (t, (struct GNUNET_MESH_Data *) msgh, GNUNET_NO);
5346 GNUNET_break_op (0);
5348 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
5349 return handle_channel_create (t,
5350 (struct GNUNET_MESH_ChannelCreate *) msgh,
5353 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
5354 return handle_channel_destroy (t,
5355 (struct GNUNET_MESH_ChannelDestroy *)
5360 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5361 "end-to-end message not known (%u)\n",
5362 ntohs (msgh->type));
5365 connection_send_ack (c, fwd);
5369 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
5370 ttl = ntohl (msg->ttl);
5371 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
5374 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
5375 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
5376 connection_send_ack (c, fwd);
5379 GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
5381 send_prebuilt_message_connection (&msg->header, c, NULL, fwd);
5382 connection_send_ack (c, fwd);
5389 * Core handler for mesh network traffic going orig->dest.
5391 * @param cls Closure (unused).
5392 * @param message Message received.
5393 * @param peer Peer who sent the message.
5395 * @return GNUNET_OK to keep the connection open,
5396 * GNUNET_SYSERR to close it (signal serious error)
5399 handle_mesh_fwd (void *cls, const struct GNUNET_PeerIdentity *peer,
5400 const struct GNUNET_MessageHeader *message)
5402 return handle_mesh_encrypted (peer,
5403 (struct GNUNET_MESH_Encrypted *)message,
5408 * Core handler for mesh network traffic going dest->orig.
5410 * @param cls Closure (unused).
5411 * @param message Message received.
5412 * @param peer Peer who sent the message.
5414 * @return GNUNET_OK to keep the connection open,
5415 * GNUNET_SYSERR to close it (signal serious error)
5418 handle_mesh_bck (void *cls, const struct GNUNET_PeerIdentity *peer,
5419 const struct GNUNET_MessageHeader *message)
5421 return handle_mesh_encrypted (peer,
5422 (struct GNUNET_MESH_Encrypted *)message,
5428 * Core handler for mesh network traffic point-to-point acks.
5430 * @param cls closure
5431 * @param message message
5432 * @param peer peer identity this notification is about
5434 * @return GNUNET_OK to keep the connection open,
5435 * GNUNET_SYSERR to close it (signal serious error)
5438 handle_mesh_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
5439 const struct GNUNET_MessageHeader *message)
5441 struct GNUNET_MESH_ACK *msg;
5442 struct MeshConnection *c;
5443 struct MeshFlowControl *fc;
5447 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
5449 msg = (struct GNUNET_MESH_ACK *) message;
5451 c = connection_get (&msg->tid, ntohl (msg->cid));
5455 GNUNET_STATISTICS_update (stats, "# ack on unknown connection", 1,
5460 ack = ntohl (msg->ack);
5461 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
5463 /* Is this a forward or backward ACK? */
5464 id = GNUNET_PEER_search (peer);
5465 if (connection_get_next_hop (c)->id == id)
5467 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
5470 else if (connection_get_prev_hop (c)->id == id)
5472 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
5477 GNUNET_break_op (0);
5481 /* Cancel polling if the ACK is bigger than before. */
5482 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task &&
5483 GMC_is_pid_bigger (ack, fc->last_ack_recv))
5485 GNUNET_SCHEDULER_cancel (fc->poll_task);
5486 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
5487 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
5490 fc->last_ack_recv = ack;
5491 connection_unlock_queue (c, fc == &c->fwd_fc);
5498 * Core handler for mesh network traffic point-to-point ack polls.
5500 * @param cls closure
5501 * @param message message
5502 * @param peer peer identity this notification is about
5504 * @return GNUNET_OK to keep the connection open,
5505 * GNUNET_SYSERR to close it (signal serious error)
5508 handle_mesh_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
5509 const struct GNUNET_MessageHeader *message)
5511 struct GNUNET_MESH_Poll *msg;
5512 struct MeshConnection *c;
5513 struct MeshFlowControl *fc;
5517 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a POLL packet from %s!\n",
5520 msg = (struct GNUNET_MESH_Poll *) message;
5522 c = connection_get (&msg->tid, ntohl (msg->cid));
5526 GNUNET_STATISTICS_update (stats, "# poll on unknown connection", 1,
5528 GNUNET_break_op (0);
5532 /* Is this a forward or backward ACK? */
5533 id = GNUNET_PEER_search (peer);
5534 if (connection_get_next_hop (c)->id == id)
5536 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
5539 else if (connection_get_prev_hop (c)->id == id)
5541 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
5546 GNUNET_break_op (0);
5550 pid = ntohl (msg->pid);
5551 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PID %u, OLD %u\n",
5552 pid, fc->last_pid_recv);
5553 fc->last_pid_recv = pid;
5554 connection_send_ack (c, fc == &c->fwd_fc);
5561 * Core handler for mesh keepalives.
5563 * @param cls closure
5564 * @param message message
5565 * @param peer peer identity this notification is about
5566 * @return GNUNET_OK to keep the connection open,
5567 * GNUNET_SYSERR to close it (signal serious error)
5569 * TODO: Check who we got this from, to validate route.
5572 handle_mesh_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
5573 const struct GNUNET_MessageHeader *message)
5575 struct GNUNET_MESH_ConnectionKeepAlive *msg;
5576 struct MeshConnection *c;
5577 struct MeshPeer *neighbor;
5580 msg = (struct GNUNET_MESH_ConnectionKeepAlive *) message;
5581 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
5584 c = connection_get (&msg->tid, ntohl (msg->cid));
5587 GNUNET_STATISTICS_update (stats, "# keepalive on unknown connection", 1,
5592 fwd = GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE == ntohs (message->type) ?
5593 GNUNET_YES : GNUNET_NO;
5595 /* Check if origin is as expected */
5596 neighbor = connection_get_hop (c, fwd);
5597 if (peer_get (peer)->id != neighbor->id)
5599 GNUNET_break_op (0);
5603 connection_change_state (c, MESH_CONNECTION_READY);
5604 connection_reset_timeout (c, fwd);
5606 if (connection_is_terminal (c, fwd))
5609 GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
5610 send_prebuilt_message_connection (message, c, NULL, fwd);
5618 * Functions to handle messages from core
5620 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
5621 {&handle_mesh_connection_create, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE,
5623 {&handle_mesh_connection_ack, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK,
5624 sizeof (struct GNUNET_MESH_ConnectionACK)},
5625 {&handle_mesh_connection_broken, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN,
5626 sizeof (struct GNUNET_MESH_ConnectionBroken)},
5627 {&handle_mesh_connection_destroy, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY,
5628 sizeof (struct GNUNET_MESH_ConnectionDestroy)},
5629 {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE,
5630 sizeof (struct GNUNET_MESH_ConnectionKeepAlive)},
5631 {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE,
5632 sizeof (struct GNUNET_MESH_ConnectionKeepAlive)},
5633 {&handle_mesh_ack, GNUNET_MESSAGE_TYPE_MESH_ACK,
5634 sizeof (struct GNUNET_MESH_ACK)},
5635 {&handle_mesh_poll, GNUNET_MESSAGE_TYPE_MESH_POLL,
5636 sizeof (struct GNUNET_MESH_Poll)},
5637 {&handle_mesh_fwd, GNUNET_MESSAGE_TYPE_MESH_FWD, 0},
5638 {&handle_mesh_bck, GNUNET_MESSAGE_TYPE_MESH_BCK, 0},
5644 * Function to process paths received for a new peer addition. The recorded
5645 * paths form the initial tunnel, which can be optimized later.
5646 * Called on each result obtained for the DHT search.
5648 * @param cls closure
5649 * @param exp when will this value expire
5650 * @param key key of the result
5651 * @param get_path path of the get request
5652 * @param get_path_length lenght of get_path
5653 * @param put_path path of the put request
5654 * @param put_path_length length of the put_path
5655 * @param type type of the result
5656 * @param size number of bytes in data
5657 * @param data pointer to the result data
5660 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
5661 const struct GNUNET_HashCode * key,
5662 const struct GNUNET_PeerIdentity *get_path,
5663 unsigned int get_path_length,
5664 const struct GNUNET_PeerIdentity *put_path,
5665 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
5666 size_t size, const void *data)
5668 struct MeshPeer *peer = cls;
5669 struct MeshPeerPath *p;
5670 struct MeshConnection *c;
5671 struct GNUNET_PeerIdentity pi;
5674 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got results from DHT!\n");
5675 GNUNET_PEER_resolve (peer->id, &pi);
5676 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&pi));
5678 p = path_build_from_dht (get_path, get_path_length,
5679 put_path, put_path_length);
5680 path_add_to_peers (p, GNUNET_NO);
5683 /* Count connections */
5684 for (c = peer->tunnel->connection_head, i = 0; NULL != c; c = c->next, i++);
5686 /* If we already have 3 (or more (?!)) connections, it's enough */
5690 if (peer->tunnel->state == MESH_TUNNEL_SEARCHING)
5692 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
5693 peer_connect (peer);
5699 /******************************************************************************/
5700 /********************* MESH LOCAL HANDLES **************************/
5701 /******************************************************************************/
5705 * Handler for client connection.
5707 * @param cls Closure (unused).
5708 * @param client Client handler.
5711 handle_local_client_connect (void *cls, struct GNUNET_SERVER_Client *client)
5713 struct MeshClient *c;
5717 c = GNUNET_malloc (sizeof (struct MeshClient));
5719 c->id = next_client_id++; /* overflow not important: just for debug */
5720 GNUNET_SERVER_client_keep (client);
5721 GNUNET_SERVER_client_set_user_context (client, c);
5722 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, c);
5727 * Handler for client disconnection
5729 * @param cls closure
5730 * @param client identification of the client; NULL
5731 * for the last call when the server is destroyed
5734 handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
5736 struct MeshClient *c;
5737 struct MeshClient *next;
5739 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected: %p\n", client);
5742 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (SERVER DOWN)\n");
5746 c = client_get (client);
5749 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "matching client found (%u, %p)\n",
5751 GNUNET_SERVER_client_drop (c->handle);
5752 c->shutting_down = GNUNET_YES;
5753 if (NULL != c->own_channels)
5755 GNUNET_CONTAINER_multihashmap32_iterate (c->own_channels,
5756 &channel_destroy_iterator, c);
5757 GNUNET_CONTAINER_multihashmap32_destroy (c->own_channels);
5760 if (NULL != c->incoming_channels)
5762 GNUNET_CONTAINER_multihashmap32_iterate (c->incoming_channels,
5763 &channel_destroy_iterator, c);
5764 GNUNET_CONTAINER_multihashmap32_destroy (c->incoming_channels);
5767 if (NULL != c->ports)
5769 GNUNET_CONTAINER_multihashmap32_iterate (c->ports,
5770 &client_release_ports, c);
5771 GNUNET_CONTAINER_multihashmap32_destroy (c->ports);
5774 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, c);
5775 GNUNET_STATISTICS_update (stats, "# clients", -1, GNUNET_NO);
5776 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client free (%p)\n", c);
5782 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " context NULL!\n");
5784 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "done!\n");
5790 * Handler for new clients
5792 * @param cls closure
5793 * @param client identification of the client
5794 * @param message the actual message, which includes messages the client wants
5797 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
5798 const struct GNUNET_MessageHeader *message)
5800 struct GNUNET_MESH_ClientConnect *cc_msg;
5801 struct MeshClient *c;
5806 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client connected %p\n", client);
5808 /* Check data sanity */
5809 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
5810 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
5811 if (0 != (size % sizeof (uint32_t)))
5814 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5817 size /= sizeof (uint32_t);
5819 /* Initialize new client structure */
5820 c = GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
5821 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client id %u\n", c->id);
5822 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client has %u ports\n", size);
5827 p = (uint32_t *) &cc_msg[1];
5828 c->ports = GNUNET_CONTAINER_multihashmap32_create (size);
5829 for (i = 0; i < size; i++)
5832 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port: %u\n", u32);
5834 /* store in client's hashmap */
5835 GNUNET_CONTAINER_multihashmap32_put (c->ports, u32, c,
5836 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
5837 /* store in global hashmap */
5838 /* FIXME only allow one client to have the port open,
5839 * have a backup hashmap with waiting clients */
5840 GNUNET_CONTAINER_multihashmap32_put (ports, u32, c,
5841 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
5845 c->own_channels = GNUNET_CONTAINER_multihashmap32_create (32);
5846 c->incoming_channels = GNUNET_CONTAINER_multihashmap32_create (32);
5847 GNUNET_SERVER_notification_context_add (nc, client);
5848 GNUNET_STATISTICS_update (stats, "# clients", 1, GNUNET_NO);
5850 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5851 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client processed\n");
5856 * Handler for requests of new tunnels
5858 * @param cls Closure.
5859 * @param client Identification of the client.
5860 * @param message The actual message.
5863 handle_local_channel_create (void *cls, struct GNUNET_SERVER_Client *client,
5864 const struct GNUNET_MessageHeader *message)
5866 struct GNUNET_MESH_ChannelMessage *msg;
5867 struct MeshPeer *peer;
5868 struct MeshTunnel2 *t;
5869 struct MeshChannel *ch;
5870 struct MeshClient *c;
5871 MESH_ChannelNumber chid;
5873 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new channel requested\n");
5875 /* Sanity check for client registration */
5876 if (NULL == (c = client_get (client)))
5879 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5882 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
5884 /* Message size sanity check */
5885 if (sizeof (struct GNUNET_MESH_ChannelMessage) != ntohs (message->size))
5888 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5892 msg = (struct GNUNET_MESH_ChannelMessage *) message;
5893 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " towards %s:%u\n",
5894 GNUNET_i2s (&msg->peer), ntohl (msg->port));
5895 chid = ntohl (msg->channel_id);
5897 /* Sanity check for duplicate channel IDs */
5898 if (NULL != channel_get_by_local_id (c, chid))
5901 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5905 peer = peer_get (&msg->peer);
5906 if (NULL == peer->tunnel)
5908 struct GNUNET_HashCode tid;
5910 GNUNET_CRYPTO_hash_create_random (GNUNET_CRYPTO_QUALITY_NONCE, &tid);
5911 peer->tunnel = tunnel_new (&tid);
5912 peer->tunnel->peer = peer;
5916 /* Create channel */
5917 ch = channel_new (t, c, chid);
5921 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5924 ch->port = ntohl (msg->port);
5925 channel_set_options (ch, ntohl (msg->opt));
5927 /* In unreliable channels, we'll use the DLL to buffer data for the root */
5928 ch->fwd_rel = GNUNET_malloc (sizeof (struct MeshChannelReliability));
5929 ch->fwd_rel->ch = ch;
5930 ch->fwd_rel->expected_delay = MESH_RETRANSMIT_TIME;
5932 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATED CHANNEL %s[%x]:%u (%x)\n",
5933 GNUNET_h2s (&t->id), ch->gid, ch->port, ch->lid_root);
5934 peer_connect (peer);
5936 /* Send create channel */
5938 struct GNUNET_MESH_ChannelCreate msgcc;
5940 msgcc.header.size = htons (sizeof (msgcc));
5941 msgcc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE);
5942 msgcc.chid = htonl (ch->gid);
5943 msgcc.port = msg->port;
5944 msgcc.opt = msg->opt;
5946 tunnel_queue_data (t, ch, &msgcc.header, GNUNET_YES);
5949 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5955 * Handler for requests of deleting tunnels
5957 * @param cls closure
5958 * @param client identification of the client
5959 * @param message the actual message
5962 handle_local_channel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
5963 const struct GNUNET_MessageHeader *message)
5965 struct GNUNET_MESH_ChannelMessage *msg;
5966 struct MeshClient *c;
5967 struct MeshChannel *ch;
5968 struct MeshTunnel2 *t;
5969 MESH_ChannelNumber chid;
5971 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5972 "Got a DESTROY CHANNEL from client!\n");
5974 /* Sanity check for client registration */
5975 if (NULL == (c = client_get (client)))
5978 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5981 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
5983 /* Message sanity check */
5984 if (sizeof (struct GNUNET_MESH_ChannelMessage) != ntohs (message->size))
5987 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5991 msg = (struct GNUNET_MESH_ChannelMessage *) message;
5993 /* Retrieve tunnel */
5994 chid = ntohl (msg->channel_id);
5995 ch = channel_get_by_local_id (c, chid);
5998 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " channel %X not found\n", chid);
6000 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6004 /* Cleanup after the tunnel */
6005 client_delete_channel (c, ch);
6006 if (c == ch->dest && GNUNET_MESH_LOCAL_CHANNEL_ID_SERV <= chid)
6010 else if (c == ch->root && GNUNET_MESH_LOCAL_CHANNEL_ID_SERV > chid)
6016 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6017 " channel %X client %p (%p, %p)\n",
6018 chid, c, ch->root, ch->dest);
6023 channel_destroy (ch);
6024 tunnel_destroy_if_empty (t);
6026 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6032 * Handler for client traffic
6034 * @param cls closure
6035 * @param client identification of the client
6036 * @param message the actual message
6039 handle_local_data (void *cls, struct GNUNET_SERVER_Client *client,
6040 const struct GNUNET_MessageHeader *message)
6042 struct GNUNET_MESH_LocalData *msg;
6043 struct MeshClient *c;
6044 struct MeshChannel *ch;
6045 MESH_ChannelNumber chid;
6049 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
6050 "Got data from a client!\n");
6052 /* Sanity check for client registration */
6053 if (NULL == (c = client_get (client)))
6056 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6059 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
6061 msg = (struct GNUNET_MESH_LocalData *) message;
6063 /* Sanity check for message size */
6064 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_LocalData);
6065 if (size < sizeof (struct GNUNET_MessageHeader))
6068 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6072 /* Channel exists? */
6073 chid = ntohl (msg->id);
6074 fwd = chid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
6075 ch = channel_get_by_local_id (c, chid);
6079 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6083 /* Is the client in the channel? */
6086 ch->root->handle == client)
6090 ch->dest->handle == client) ) )
6093 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6097 /* Ok, everything is correct, send the message
6098 * (pretend we got it from a mesh peer)
6101 struct GNUNET_MESH_Data *payload;
6102 char cbuf[sizeof(struct GNUNET_MESH_Data) + size];
6105 mid = fwd ? &ch->mid_send_fwd : &ch->mid_send_bck;
6106 if (GNUNET_YES == ch->reliable)
6108 struct MeshChannelReliability *rel;
6109 struct MeshReliableMessage *copy;
6111 rel = fwd ? ch->fwd_rel : ch->bck_rel;
6112 copy = GNUNET_malloc (sizeof (struct MeshReliableMessage)
6113 + sizeof(struct GNUNET_MESH_Data)
6116 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! DATA %u\n", copy->mid);
6117 copy->timestamp = GNUNET_TIME_absolute_get ();
6120 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " n_sent %u\n", rel->n_sent);
6121 GNUNET_CONTAINER_DLL_insert_tail (rel->head_sent, rel->tail_sent, copy);
6122 if (GNUNET_SCHEDULER_NO_TASK == rel->retry_task)
6125 GNUNET_TIME_relative_multiply (rel->expected_delay,
6126 MESH_RETRANSMIT_MARGIN);
6128 GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
6129 &channel_retransmit_message,
6132 payload = (struct GNUNET_MESH_Data *) ©[1];
6136 payload = (struct GNUNET_MESH_Data *) cbuf;
6138 payload->mid = htonl (*mid);
6140 memcpy (&payload[1], &msg[1], size);
6141 payload->header.size = htons (sizeof (struct GNUNET_MESH_Data) + size);
6142 payload->header.type = htons (chid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV ?
6143 GNUNET_MESSAGE_TYPE_MESH_UNICAST :
6144 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
6145 payload->chid = htonl (ch->gid);
6146 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
6147 " calling generic handler...\n");
6148 send_prebuilt_message_channel (&payload->header, ch, fwd);
6150 if (tunnel_get_buffer (ch->t, fwd) > 0)
6151 send_local_ack (ch, c, fwd);
6152 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "receive done OK\n");
6153 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6160 * Handler for client's ACKs for payload traffic.
6162 * @param cls Closure (unused).
6163 * @param client Identification of the client.
6164 * @param message The actual message.
6167 handle_local_ack (void *cls, struct GNUNET_SERVER_Client *client,
6168 const struct GNUNET_MessageHeader *message)
6170 struct GNUNET_MESH_LocalAck *msg;
6171 struct MeshChannelReliability *rel;
6172 struct MeshChannel *ch;
6173 struct MeshClient *c;
6174 MESH_ChannelNumber chid;
6177 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a local ACK\n");
6179 /* Sanity check for client registration */
6180 if (NULL == (c = client_get (client)))
6183 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6186 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
6188 msg = (struct GNUNET_MESH_LocalAck *) message;
6190 /* Channel exists? */
6191 chid = ntohl (msg->channel_id);
6192 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on channel %X\n", chid);
6193 ch = channel_get_by_local_id (c, chid);
6197 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Channel %X unknown.\n", chid);
6198 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id);
6199 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6203 fwd = chid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
6204 rel = fwd ? ch->fwd_rel : ch->bck_rel;
6206 rel->client_ready = GNUNET_YES;
6207 channel_send_client_buffered_data (ch, c, rel);
6208 channel_send_ack (ch, 64 - rel->n_recv, fwd);
6210 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6217 * Iterator over all tunnels to send a monitoring client info about each tunnel.
6219 * @param cls Closure (client handle).
6220 * @param key Key (hashed tunnel ID, unused).
6221 * @param value Tunnel info.
6223 * @return GNUNET_YES, to keep iterating.
6226 monitor_all_tunnels_iterator (void *cls,
6227 const struct GNUNET_HashCode * key,
6230 struct GNUNET_SERVER_Client *client = cls;
6231 struct MeshChannel *ch = value;
6232 struct GNUNET_MESH_LocalMonitor *msg;
6234 msg = GNUNET_malloc (sizeof(struct GNUNET_MESH_LocalMonitor));
6235 msg->channel_id = htonl (ch->gid);
6236 msg->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
6237 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS);
6239 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6240 "* sending info about tunnel %s\n",
6241 GNUNET_i2s (&msg->owner));
6243 GNUNET_SERVER_notification_context_unicast (nc, client,
6244 &msg->header, GNUNET_NO);
6250 * Handler for client's MONITOR request.
6252 * @param cls Closure (unused).
6253 * @param client Identification of the client.
6254 * @param message The actual message.
6257 handle_local_get_tunnels (void *cls, struct GNUNET_SERVER_Client *client,
6258 const struct GNUNET_MessageHeader *message)
6260 struct MeshClient *c;
6262 /* Sanity check for client registration */
6263 if (NULL == (c = client_get (client)))
6266 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6270 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6271 "Received get tunnels request from client %u\n",
6273 GNUNET_CONTAINER_multihashmap_iterate (tunnels,
6274 monitor_all_tunnels_iterator,
6276 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6277 "Get tunnels request from client %u completed\n",
6279 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6284 * Handler for client's MONITOR_TUNNEL request.
6286 * @param cls Closure (unused).
6287 * @param client Identification of the client.
6288 * @param message The actual message.
6291 handle_local_show_tunnel (void *cls, struct GNUNET_SERVER_Client *client,
6292 const struct GNUNET_MessageHeader *message)
6294 const struct GNUNET_MESH_LocalMonitor *msg;
6295 struct GNUNET_MESH_LocalMonitor *resp;
6296 struct MeshClient *c;
6297 struct MeshChannel *ch;
6299 /* Sanity check for client registration */
6300 if (NULL == (c = client_get (client)))
6303 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
6307 msg = (struct GNUNET_MESH_LocalMonitor *) message;
6308 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6309 "Received tunnel info request from client %u for tunnel %s[%X]\n",
6312 ntohl (msg->channel_id));
6313 // ch = channel_get (&msg->owner, ntohl (msg->channel_id));
6317 /* We don't know the tunnel */
6318 struct GNUNET_MESH_LocalMonitor warn;
6321 GNUNET_SERVER_notification_context_unicast (nc, client,
6324 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6328 /* Initialize context */
6329 resp = GNUNET_malloc (sizeof (struct GNUNET_MESH_LocalMonitor));
6331 resp->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
6332 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
6333 &resp->header, GNUNET_NO);
6336 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6337 "Monitor tunnel request from client %u completed\n",
6339 GNUNET_SERVER_receive_done (client, GNUNET_OK);
6344 * Functions to handle messages from clients
6346 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
6347 {&handle_local_new_client, NULL,
6348 GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
6349 {&handle_local_channel_create, NULL,
6350 GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE,
6351 sizeof (struct GNUNET_MESH_ChannelMessage)},
6352 {&handle_local_channel_destroy, NULL,
6353 GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY,
6354 sizeof (struct GNUNET_MESH_ChannelMessage)},
6355 {&handle_local_data, NULL,
6356 GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA, 0},
6357 {&handle_local_ack, NULL,
6358 GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK,
6359 sizeof (struct GNUNET_MESH_LocalAck)},
6360 {&handle_local_get_tunnels, NULL,
6361 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS,
6362 sizeof (struct GNUNET_MessageHeader)},
6363 {&handle_local_show_tunnel, NULL,
6364 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL,
6365 sizeof (struct GNUNET_MESH_LocalMonitor)},
6371 * Method called whenever a given peer connects.
6373 * @param cls closure
6374 * @param peer peer identity this notification is about
6377 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
6379 struct MeshPeer *pi;
6380 struct MeshPeerPath *path;
6382 DEBUG_CONN ("Peer connected\n");
6383 DEBUG_CONN (" %s\n", GNUNET_i2s (&my_full_id));
6384 pi = peer_get (peer);
6387 DEBUG_CONN (" (self)\n");
6388 path = path_new (1);
6392 DEBUG_CONN (" %s\n", GNUNET_i2s (peer));
6393 path = path_new (2);
6394 path->peers[1] = pi->id;
6395 GNUNET_PEER_change_rc (pi->id, 1);
6396 GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO);
6398 path->peers[0] = myid;
6399 GNUNET_PEER_change_rc (myid, 1);
6400 peer_add_path (pi, path, GNUNET_YES);
6402 pi->connections = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_YES);
6408 * Method called whenever a peer disconnects.
6410 * @param cls closure
6411 * @param peer peer identity this notification is about
6414 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
6416 struct MeshPeer *pi;
6418 DEBUG_CONN ("Peer disconnected\n");
6419 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
6426 peer_remove_path (pi, myid, pi->id);
6428 GNUNET_CONTAINER_multihashmap_iterate (pi->connections,
6431 GNUNET_CONTAINER_multihashmap_destroy (pi->connections);
6432 pi->connections = NULL;
6435 DEBUG_CONN (" (self)\n");
6437 GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO);
6444 * Install server (service) handlers and start listening to clients.
6449 GNUNET_SERVER_add_handlers (server_handle, client_handlers);
6450 GNUNET_SERVER_connect_notify (server_handle,
6451 &handle_local_client_connect, NULL);
6452 GNUNET_SERVER_disconnect_notify (server_handle,
6453 &handle_local_client_disconnect, NULL);
6454 nc = GNUNET_SERVER_notification_context_create (server_handle, 1);
6456 clients_head = NULL;
6457 clients_tail = NULL;
6459 GNUNET_SERVER_resume (server_handle);
6464 * To be called on core init/fail.
6466 * @param cls Closure (config)
6467 * @param server handle to the server for this service
6468 * @param identity the public identity of this peer
6471 core_init (void *cls, struct GNUNET_CORE_Handle *server,
6472 const struct GNUNET_PeerIdentity *identity)
6474 const struct GNUNET_CONFIGURATION_Handle *c = cls;
6477 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
6478 GNUNET_break (core_handle == server);
6479 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)) ||
6482 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
6483 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6485 GNUNET_i2s (identity));
6486 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6488 GNUNET_i2s (&my_full_id));
6489 GNUNET_CORE_disconnect (core_handle);
6490 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
6491 NULL, /* Closure passed to MESH functions */
6492 &core_init, /* Call core_init once connected */
6493 &core_connect, /* Handle connects */
6494 &core_disconnect, /* remove peers on disconnects */
6495 NULL, /* Don't notify about all incoming messages */
6496 GNUNET_NO, /* For header only in notification */
6497 NULL, /* Don't notify about all outbound messages */
6498 GNUNET_NO, /* For header-only out notification */
6499 core_handlers); /* Register these handlers */
6508 /******************************************************************************/
6509 /************************ MAIN FUNCTIONS ****************************/
6510 /******************************************************************************/
6513 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
6515 * @param cls closure
6516 * @param key current key code
6517 * @param value value in the hash map
6518 * @return GNUNET_YES if we should continue to iterate,
6522 shutdown_tunnel (void *cls, const struct GNUNET_HashCode * key, void *value)
6524 struct MeshTunnel2 *t = value;
6532 * Task run during shutdown.
6538 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
6540 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n");
6542 if (core_handle != NULL)
6544 GNUNET_CORE_disconnect (core_handle);
6547 GNUNET_CONTAINER_multihashmap_iterate (tunnels, &shutdown_tunnel, NULL);
6548 if (dht_handle != NULL)
6550 GNUNET_DHT_disconnect (dht_handle);
6555 GNUNET_SERVER_notification_context_destroy (nc);
6558 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
6560 GNUNET_SCHEDULER_cancel (announce_id_task);
6561 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
6563 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shut down\n");
6568 * Process mesh requests.
6570 * @param cls closure
6571 * @param server the initialized server
6572 * @param c configuration to use
6575 run (void *cls, struct GNUNET_SERVER_Handle *server,
6576 const struct GNUNET_CONFIGURATION_Handle *c)
6579 struct GNUNET_CRYPTO_EccPrivateKey *pk;
6581 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n");
6582 server_handle = server;
6583 GNUNET_SERVER_suspend (server_handle);
6586 GNUNET_CONFIGURATION_get_value_filename (c, "PEER", "PRIVATE_KEY",
6589 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6591 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
6592 "mesh", "peer/privatekey");
6593 GNUNET_SCHEDULER_shutdown ();
6598 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_CONNECTION_TIME",
6599 &refresh_connection_time))
6601 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6603 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
6604 "mesh", "refresh path time");
6605 GNUNET_SCHEDULER_shutdown ();
6610 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "ID_ANNOUNCE_TIME",
6613 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6615 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
6616 "mesh", "id announce time");
6617 GNUNET_SCHEDULER_shutdown ();
6622 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "CONNECT_TIMEOUT",
6625 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6627 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
6628 "mesh", "connect timeout");
6629 GNUNET_SCHEDULER_shutdown ();
6634 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
6637 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6639 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
6640 "mesh", "max msgs queue");
6641 GNUNET_SCHEDULER_shutdown ();
6646 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_CONNECTIONS",
6649 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
6651 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
6652 "mesh", "max tunnels");
6653 GNUNET_SCHEDULER_shutdown ();
6658 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
6661 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
6663 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
6664 "mesh", "default ttl", 64);
6669 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_PEERS",
6672 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
6673 _("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
6674 "mesh", "max peers", 1000);
6679 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DROP_PERCENT",
6686 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
6687 "Mesh is running with drop mode enabled. "
6688 "This is NOT a good idea! "
6689 "Remove the DROP_PERCENT option from your configuration.\n");
6693 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DHT_REPLICATION_LEVEL",
6694 &dht_replication_level))
6696 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
6698 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
6699 "mesh", "dht replication level", 3);
6700 dht_replication_level = 3;
6703 tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
6704 peers = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
6705 ports = GNUNET_CONTAINER_multihashmap32_create (32);
6707 dht_handle = GNUNET_DHT_connect (c, 64);
6708 if (NULL == dht_handle)
6712 stats = GNUNET_STATISTICS_create ("mesh", c);
6714 /* Scheduled the task to clean up when shutdown is called */
6715 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
6717 pk = GNUNET_CRYPTO_ecc_key_create_from_file (keyfile);
6718 GNUNET_free (keyfile);
6719 GNUNET_assert (NULL != pk);
6720 my_private_key = pk;
6721 GNUNET_CRYPTO_ecc_key_get_public (my_private_key, &my_public_key);
6722 GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
6723 &my_full_id.hashPubKey);
6724 myid = GNUNET_PEER_intern (&my_full_id);
6725 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
6726 "Mesh for peer [%s] starting\n",
6727 GNUNET_i2s(&my_full_id));
6729 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
6730 NULL, /* Closure passed to MESH functions */
6731 &core_init, /* Call core_init once connected */
6732 &core_connect, /* Handle connects */
6733 &core_disconnect, /* remove peers on disconnects */
6734 NULL, /* Don't notify about all incoming messages */
6735 GNUNET_NO, /* For header only in notification */
6736 NULL, /* Don't notify about all outbound messages */
6737 GNUNET_NO, /* For header-only out notification */
6738 core_handlers); /* Register these handlers */
6739 if (NULL == core_handle)
6742 GNUNET_SCHEDULER_shutdown ();
6745 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
6746 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mesh service running\n");
6751 * The main function for the mesh service.
6753 * @param argc number of arguments from the command line
6754 * @param argv command line arguments
6755 * @return 0 ok, 1 on error
6758 main (int argc, char *const *argv)
6763 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main()\n");
6764 r = GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
6766 ret = (GNUNET_OK == r) ? 0 : 1;
6767 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main() END\n");