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.c
23 * @brief GNUnet MESH service
24 * @author Bartlomiej Polot
27 * - keep queues until receiving ACK
30 * - relay corking down to core
31 * - set ttl relative to path length
39 #include "mesh_protocol.h"
40 #include "mesh_path.h"
41 #include "block_mesh.h"
42 #include "gnunet_dht_service.h"
43 #include "gnunet_statistics_service.h"
45 #define MESH_BLOOM_SIZE 128
47 #define MESH_DEBUG_DHT GNUNET_NO
48 #define MESH_DEBUG_CONNECTION GNUNET_NO
49 #define MESH_DEBUG_TIMING __LINUX__ && GNUNET_NO
51 #define MESH_MAX_POLL_TIME GNUNET_TIME_relative_multiply (\
52 GNUNET_TIME_UNIT_MINUTES,\
55 #if MESH_DEBUG_CONNECTION
56 #define DEBUG_CONN(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
58 #define DEBUG_CONN(...)
62 #define DEBUG_DHT(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
64 #define DEBUG_DHT(...)
71 struct timespec __mesh_start;
72 struct timespec __mesh_end;
73 #define INTERVAL_START clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_start))
74 #define INTERVAL_END \
76 clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_end));\
77 double __diff = __mesh_end.tv_nsec - __mesh_start.tv_nsec;\
78 if (__diff < 0) __diff += 1000000000;\
82 #define INTERVAL_SHOW \
84 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "AVG process time: %f ns\n", __sum/__count)
86 #define INTERVAL_START
91 /******************************************************************************/
92 /************************ DATA STRUCTURES ****************************/
93 /******************************************************************************/
95 /** FWD declaration */
101 * Struct containing info about a queued transmission to this peer
108 struct MeshPeerQueue *next;
113 struct MeshPeerQueue *prev;
116 * Peer this transmission is directed to.
118 struct MeshPeerInfo *peer;
121 * Tunnel this message belongs to.
123 struct MeshTunnel *tunnel;
126 * Pointer to info stucture used as cls.
136 * Size of the message
143 * Struct containing all information regarding a given peer
153 * Last time we heard from this peer
155 struct GNUNET_TIME_Absolute last_contact;
158 * Number of attempts to reconnect so far
160 int n_reconnect_attempts;
163 * Paths to reach the peer, ordered by ascending hop count
165 struct MeshPeerPath *path_head;
168 * Paths to reach the peer, ordered by ascending hop count
170 struct MeshPeerPath *path_tail;
173 * Handle to stop the DHT search for a path to this peer
175 struct GNUNET_DHT_GetHandle *dhtget;
178 * Array of tunnels this peer is the target of.
179 * Most probably a small amount, therefore not a hashmap.
180 * When the path to the peer changes, notify these tunnels to let them
181 * re-adjust their path trees.
183 struct MeshTunnel **tunnels;
186 * Number of tunnels this peers participates in
188 unsigned int ntunnels;
191 * Transmission queue to core DLL head
193 struct MeshPeerQueue *queue_head;
196 * Transmission queue to core DLL tail
198 struct MeshPeerQueue *queue_tail;
201 * How many messages are in the queue to this peer.
203 unsigned int queue_n;
206 * Handle for queued transmissions
208 struct GNUNET_CORE_TransmitHandle *core_transmit;
213 * Struct to encapsulate all the Flow Control information to a peer in the
214 * context of a tunnel: Same peer in different tunnels will have independent
215 * flow control structures, allowing to choke/free tunnels according to its
218 struct MeshFlowControl
221 * ID of the last packet sent towards the peer.
223 uint32_t last_pid_sent;
226 * ID of the last packet received from the peer.
228 uint32_t last_pid_recv;
231 * Last ACK sent to the peer (peer can't send more than this PID).
233 uint32_t last_ack_sent;
236 * Last ACK sent towards the origin (for traffic towards leaf node).
238 uint32_t last_ack_recv;
241 * How many payload messages are in the queue towards this peer.
246 * Task to poll the peer in case of a lost ACK causes stall.
248 GNUNET_SCHEDULER_TaskIdentifier poll_task;
251 * How frequently to poll for ACKs.
253 struct GNUNET_TIME_Relative poll_time;
256 * On which tunnel to poll.
257 * Using an explicit poll_ctx would not help memory wise,
258 * since the allocated context would have to be stored in the
259 * fc struct in order to free it upon cancelling poll_task.
261 struct MeshTunnel *t;
266 * Globally unique tunnel identification (owner + number)
267 * DO NOT USE OVER THE NETWORK
272 * Node that owns the tunnel
277 * Tunnel number to differentiate all the tunnels owned by the node oid
278 * ( tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI )
280 MESH_TunnelNumber tid;
285 * Info needed to retry a message in case it gets lost.
287 struct MeshSentMessage {
290 * Tunnel this message is in.
292 struct MeshTunnel *t;
295 * ID of the message (ACK needed to free)
300 * Task to resend/poll in case no ACK is received.
302 GNUNET_SCHEDULER_TaskIdentifier retry_task; // FIXME move to per tunnel timer?
305 * Counter for exponential backoff.
307 struct GNUNET_TIME_Relative retry_timer;
310 * Is this a forward or backward going message?
314 /* struct GNUNET_MESH_Data with payload */
318 * Struct containing all information regarding a tunnel
319 * For an intermediate node the improtant info used will be:
320 * - id Tunnel unique identification
321 * - paths[0] To know where to send it next
322 * - metainfo: ready, speeds, accounting
329 struct MESH_TunnelID id;
332 * Port of the tunnel.
337 * State of the tunnel.
339 enum MeshTunnelState state;
342 * Local tunnel number ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI or 0 )
344 MESH_TunnelNumber local_tid;
347 * Local tunnel number for local destination clients (incoming number)
348 * ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV or 0). All clients share the same
351 MESH_TunnelNumber local_tid_dest;
354 * Is the tunnel bufferless (minimum latency)?
359 * Is the tunnel reliable?
364 * Force sending ACK? Flag to allow duplicate ACK on POLL.
369 * How many messages do we accept in the forward queue.
371 unsigned int queue_max;
374 * Last time the tunnel was used
376 struct GNUNET_TIME_Absolute timestamp;
379 * Destination of the tunnel.
384 * Next hop in the tunnel. If 0, @c client must be set.
386 GNUNET_PEER_Id next_hop;
389 * Previous hop in the tunnel. If 0, @c owner must be set.
391 GNUNET_PEER_Id prev_hop;
394 * Flow control information about @c next_hop or @c client.
396 struct MeshFlowControl next_fc;
399 * Flow control information about @c prev_hop or @c owner.
401 struct MeshFlowControl prev_fc;
404 * Client owner of the tunnel, if any
406 struct MeshClient *owner;
409 * Client destination of the tunnel, if any.
411 struct MeshClient *client;
414 * Task to keep the used paths alive at the owner,
415 * time tunnel out on all the other peers.
417 GNUNET_SCHEDULER_TaskIdentifier maintenance_task;
420 * Path being used for the tunnel.
422 struct MeshPeerPath *path;
425 * Flag to signal the destruction of the tunnel.
426 * If this is set GNUNET_YES the tunnel will be destroyed
427 * when the queue is empty.
432 * Total messages pending for this tunnels, payload or not.
434 unsigned int pending_messages;
437 * Messages sent and not yet ACK'd.
438 * Only present (non-NULL) at the owner of a tunnel.
440 struct GNUNET_CONTAINER_MultiHashMap32 *sent_messages_fwd;
443 * Messages sent and not yet ACK'd.
444 * Only present (non-NULL) at the destination of a tunnel.
446 struct GNUNET_CONTAINER_MultiHashMap32 *sent_messages_bck;
451 * Struct containing information about a client of the service
453 * TODO: add a list of 'waiting' ports
460 struct MeshClient *next;
465 struct MeshClient *prev;
468 * Tunnels that belong to this client, indexed by local id
470 struct GNUNET_CONTAINER_MultiHashMap *own_tunnels;
473 * Tunnels this client has accepted, indexed by incoming local id
475 struct GNUNET_CONTAINER_MultiHashMap *incoming_tunnels;
478 * Handle to communicate with the client
480 struct GNUNET_SERVER_Client *handle;
483 * Ports that this client has declared interest in.
484 * Indexed by a GMC_hash32 (type), contains *Client.
486 struct GNUNET_CONTAINER_MultiHashMap *ports;
489 * Whether the client is active or shutting down (don't send confirmations
490 * to a client that is shutting down.
495 * ID of the client, mainly for debug messages
502 /******************************************************************************/
503 /************************ DEBUG FUNCTIONS ****************************/
504 /******************************************************************************/
508 * GNUNET_SCHEDULER_Task for printing a message after some operation is done
509 * @param cls string to print
510 * @param success GNUNET_OK if the PUT was transmitted,
511 * GNUNET_NO on timeout,
512 * GNUNET_SYSERR on disconnect from service
513 * after the PUT message was transmitted
514 * (so we don't know if it was received or not)
519 mesh_debug (void *cls, int success)
523 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%s (%d)\n", s, success);
528 unsigned int debug_fwd_ack;
529 unsigned int debug_bck_ack;
533 /******************************************************************************/
534 /*********************** GLOBAL VARIABLES ****************************/
535 /******************************************************************************/
537 /************************** Configuration parameters **************************/
540 * How often to send tunnel keepalives. Tunnels timeout after 4 missed.
542 static struct GNUNET_TIME_Relative refresh_path_time;
545 * How often to PUT own ID in the DHT.
547 static struct GNUNET_TIME_Relative id_announce_time;
550 * Maximum time allowed to connect to a peer found by string.
552 static struct GNUNET_TIME_Relative connect_timeout;
555 * Default TTL for payload packets.
557 static unsigned long long default_ttl;
560 * DHT replication level, see DHT API: GNUNET_DHT_get_start, GNUNET_DHT_put.
562 static unsigned long long dht_replication_level;
565 * How many tunnels are we willing to maintain.
566 * Local tunnels are always allowed, even if there are more tunnels than max.
568 static unsigned long long max_tunnels;
571 * How many messages *in total* are we willing to queue, divided by number of
572 * tunnels to get tunnel queue size.
574 static unsigned long long max_msgs_queue;
577 * How many peers do we want to remember?
579 static unsigned long long max_peers;
582 * Percentage of messages that will be dropped (for test purposes only).
584 static unsigned long long drop_percent;
586 /*************************** Static global variables **************************/
589 * Hostkey generation context
591 static struct GNUNET_CRYPTO_EccKeyGenerationContext *keygen;
594 * DLL with all the clients, head.
596 static struct MeshClient *clients_head;
599 * DLL with all the clients, tail.
601 static struct MeshClient *clients_tail;
604 * Tunnels known, indexed by MESH_TunnelID (MeshTunnel).
606 static struct GNUNET_CONTAINER_MultiHashMap *tunnels;
609 * Number of tunnels known.
611 static unsigned long long n_tunnels;
614 * Tunnels incoming, indexed by MESH_TunnelNumber
615 * (which is greater than GNUNET_MESH_LOCAL_TUNNEL_ID_SERV).
617 static struct GNUNET_CONTAINER_MultiHashMap *incoming_tunnels;
620 * Peers known, indexed by PeerIdentity (MeshPeerInfo).
622 static struct GNUNET_CONTAINER_MultiHashMap *peers;
625 * Handle to communicate with transport
627 // static struct GNUNET_TRANSPORT_Handle *transport_handle;
630 * Handle to communicate with core.
632 static struct GNUNET_CORE_Handle *core_handle;
637 static struct GNUNET_DHT_Handle *dht_handle;
642 static struct GNUNET_SERVER_Handle *server_handle;
645 * Handle to the statistics service.
647 static struct GNUNET_STATISTICS_Handle *stats;
650 * Notification context, to send messages to local clients.
652 static struct GNUNET_SERVER_NotificationContext *nc;
655 * Local peer own ID (memory efficient handle).
657 static GNUNET_PEER_Id myid;
660 * Local peer own ID (full value).
662 static struct GNUNET_PeerIdentity my_full_id;
667 static struct GNUNET_CRYPTO_EccPrivateKey *my_private_key;
672 static struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded my_public_key;
675 * Tunnel ID for the next created tunnel (global tunnel number).
677 static MESH_TunnelNumber next_tid;
680 * Tunnel ID for the next incoming tunnel (local tunnel number).
682 static MESH_TunnelNumber next_local_tid;
685 * All ports clients of this peer have opened.
687 static struct GNUNET_CONTAINER_MultiHashMap *ports;
690 * Task to periodically announce itself in the network.
692 GNUNET_SCHEDULER_TaskIdentifier announce_id_task;
695 * Next ID to assign to a client.
697 unsigned int next_client_id;
700 /******************************************************************************/
701 /*********************** DECLARATIONS **************************/
702 /******************************************************************************/
705 * Function to process paths received for a new peer addition. The recorded
706 * paths form the initial tunnel, which can be optimized later.
707 * Called on each result obtained for the DHT search.
710 * @param exp when will this value expire
711 * @param key key of the result
712 * @param type type of the result
713 * @param size number of bytes in data
714 * @param data pointer to the result data
717 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
718 const struct GNUNET_HashCode * key,
719 const struct GNUNET_PeerIdentity *get_path,
720 unsigned int get_path_length,
721 const struct GNUNET_PeerIdentity *put_path,
722 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
723 size_t size, const void *data);
727 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
728 * and insert it in the appropriate structures if the peer is not known yet.
730 * @param peer Full identity of the peer.
732 * @return Existing or newly created peer info.
734 static struct MeshPeerInfo *
735 peer_get (const struct GNUNET_PeerIdentity *peer);
739 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
740 * and insert it in the appropriate structures if the peer is not known yet.
742 * @param peer Short identity of the peer.
744 * @return Existing or newly created peer info.
746 static struct MeshPeerInfo *
747 peer_get_short (const GNUNET_PEER_Id peer);
751 * Build a PeerPath from the paths returned from the DHT, reversing the paths
752 * to obtain a local peer -> destination path and interning the peer ids.
754 * @return Newly allocated and created path
756 static struct MeshPeerPath *
757 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
758 unsigned int get_path_length,
759 const struct GNUNET_PeerIdentity *put_path,
760 unsigned int put_path_length);
764 * Adds a path to the peer_infos of all the peers in the path
766 * @param p Path to process.
767 * @param confirmed Whether we know if the path works or not.
770 path_add_to_peers (struct MeshPeerPath *p, int confirmed);
775 * Search for a tunnel by global ID using full PeerIdentities.
777 * @param oid owner of the tunnel.
778 * @param tid global tunnel number.
780 * @return tunnel handler, NULL if doesn't exist.
782 static struct MeshTunnel *
783 tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid);
787 * Notify a tunnel that a connection has broken that affects at least
790 * @param t Tunnel affected.
791 * @param p1 Peer that got disconnected from p2.
792 * @param p2 Peer that got disconnected from p1.
794 * @return Short ID of the peer disconnected (either p1 or p2).
795 * 0 if the tunnel remained unaffected.
797 static GNUNET_PEER_Id
798 tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
803 * @brief Use the given path for the tunnel.
804 * Update the next and prev hops (and RCs).
805 * (Re)start the path refresh in case the tunnel is locally owned.
807 * @param t Tunnel to update.
808 * @param p Path to use.
811 tunnel_use_path (struct MeshTunnel *t, struct MeshPeerPath *p);
814 * Tunnel is empty: destroy it.
816 * Notifies all participants (peers, cleints) about the destruction.
818 * @param t Tunnel to destroy.
821 tunnel_destroy_empty (struct MeshTunnel *t);
824 * @brief Queue and pass message to core when possible.
826 * If type is payload (UNICAST, TO_ORIGIN, MULTICAST) checks for queue status
827 * and accounts for it. In case the queue is full, the message is dropped and
830 * Otherwise, message is treated as internal and allowed to go regardless of
833 * @param cls Closure (@c type dependant). It will be used by queue_send to
834 * build the message to be sent if not already prebuilt.
835 * @param type Type of the message, 0 for a raw message.
836 * @param size Size of the message.
837 * @param dst Neighbor to send message to.
838 * @param t Tunnel this message belongs to.
841 queue_add (void *cls, uint16_t type, size_t size,
842 struct MeshPeerInfo *dst, struct MeshTunnel *t);
846 * Free a transmission that was already queued with all resources
847 * associated to the request.
849 * @param queue Queue handler to cancel.
850 * @param clear_cls Is it necessary to free associated cls?
853 queue_destroy (struct MeshPeerQueue *queue, int clear_cls);
857 * @brief Get the next transmittable message from the queue.
859 * This will be the head, except in the case of being a data packet
860 * not allowed by the destination peer.
862 * @param peer Destination peer.
864 * @return The next viable MeshPeerQueue element to send to that peer.
865 * NULL when there are no transmittable messages.
867 struct MeshPeerQueue *
868 queue_get_next (const struct MeshPeerInfo *peer);
872 * Core callback to write a queued packet to core buffer
874 * @param cls Closure (peer info).
875 * @param size Number of bytes available in buf.
876 * @param buf Where the to write the message.
878 * @return number of bytes written to buf
881 queue_send (void *cls, size_t size, void *buf);
884 /******************************************************************************/
885 /************************ PERIODIC FUNCTIONS ****************************/
886 /******************************************************************************/
889 * Periodically announce self id in the DHT
892 * @param tc task context
895 announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
899 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
901 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
905 * - Set data expiration in function of X
908 DEBUG_DHT ("DHT_put for ID %s started.\n", GNUNET_i2s (&my_full_id));
910 block.id = my_full_id;
911 GNUNET_DHT_put (dht_handle, /* DHT handle */
912 &my_full_id.hashPubKey, /* Key to use */
913 dht_replication_level, /* Replication level */
914 GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, /* DHT options */
915 GNUNET_BLOCK_TYPE_MESH_PEER, /* Block type */
916 sizeof (block), /* Size of the data */
917 (const char *) &block, /* Data itself */
918 GNUNET_TIME_UNIT_FOREVER_ABS, /* Data expiration */
919 GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */
920 NULL, /* Continuation */
921 NULL); /* Continuation closure */
923 GNUNET_SCHEDULER_add_delayed (id_announce_time, &announce_id, cls);
927 /******************************************************************************/
928 /****************** GENERAL HELPER FUNCTIONS ************************/
929 /******************************************************************************/
933 * Check if client has registered with the service and has not disconnected
935 * @param client the client to check
937 * @return non-NULL if client exists in the global DLL
939 static struct MeshClient *
940 client_get (struct GNUNET_SERVER_Client *client)
942 struct MeshClient *c;
947 if (c->handle == client)
956 * Deletes a tunnel from a client (either owner or destination). To be used on
959 * @param c Client whose tunnel to delete.
960 * @param t Tunnel which should be deleted.
963 client_delete_tunnel (struct MeshClient *c, struct MeshTunnel *t)
965 struct GNUNET_HashCode hash;
969 GMC_hash32 (t->local_tid, &hash);
970 GNUNET_assert (GNUNET_YES ==
971 GNUNET_CONTAINER_multihashmap_remove (c->own_tunnels,
975 else if (c == t->client)
977 GMC_hash32 (t->local_tid_dest, &hash);
978 GNUNET_assert (GNUNET_YES ==
979 GNUNET_CONTAINER_multihashmap_remove (c->incoming_tunnels,
990 * Notify the appropriate client that a new incoming tunnel was created.
992 * @param t Tunnel that was created.
995 send_client_tunnel_create (struct MeshTunnel *t)
997 struct GNUNET_MESH_TunnelMessage msg;
999 if (NULL == t->client)
1001 msg.header.size = htons (sizeof (msg));
1002 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
1003 msg.tunnel_id = htonl (t->local_tid_dest);
1004 msg.port = htonl (t->port);
1005 GNUNET_PEER_resolve (t->id.oid, &msg.peer);
1006 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
1007 &msg.header, GNUNET_NO);
1012 * Notify dest client that the incoming tunnel is no longer valid.
1014 * @param c Client to notify..
1015 * @param t Tunnel that is destroyed.
1018 send_client_tunnel_destroy (struct MeshClient *c, struct MeshTunnel *t)
1020 struct GNUNET_MESH_TunnelMessage msg;
1027 if (c != t->client && c != t->owner)
1032 msg.header.size = htons (sizeof (msg));
1033 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1034 msg.tunnel_id = htonl (t->local_tid_dest);
1035 msg.port = htonl (0);
1036 memset(&msg.peer, 0, sizeof (msg.peer));
1037 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
1038 &msg.header, GNUNET_NO);
1043 * Iterator over all the peers to remove the oldest not-used entry.
1045 * @param cls Closure (unsued).
1046 * @param key ID of the peer.
1047 * @param value Peer_Info of the peer.
1052 peer_info_timeout (void *cls,
1053 const struct GNUNET_HashCode *key,
1060 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
1061 * and insert it in the appropriate structures if the peer is not known yet.
1063 * @param peer Full identity of the peer.
1065 * @return Existing or newly created peer info.
1067 static struct MeshPeerInfo *
1068 peer_get (const struct GNUNET_PeerIdentity *peer)
1070 struct MeshPeerInfo *peer_info;
1072 peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
1073 if (NULL == peer_info)
1076 (struct MeshPeerInfo *) GNUNET_malloc (sizeof (struct MeshPeerInfo));
1077 if (GNUNET_CONTAINER_multihashmap_size (peers) > max_peers)
1079 GNUNET_CONTAINER_multihashmap_iterate (peers,
1083 GNUNET_CONTAINER_multihashmap_put (peers, &peer->hashPubKey, peer_info,
1084 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
1085 peer_info->id = GNUNET_PEER_intern (peer);
1087 peer_info->last_contact = GNUNET_TIME_absolute_get();
1094 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
1095 * and insert it in the appropriate structures if the peer is not known yet.
1097 * @param peer Short identity of the peer.
1099 * @return Existing or newly created peer info.
1101 static struct MeshPeerInfo *
1102 peer_get_short (const GNUNET_PEER_Id peer)
1104 struct GNUNET_PeerIdentity id;
1106 GNUNET_PEER_resolve (peer, &id);
1107 return peer_get (&id);
1112 * Choose the best path towards a peer considering the tunnel properties.
1114 * @param peer The destination peer.
1115 * @param t The tunnel the path is for.
1117 * @return Best current known path towards the peer, if any.
1119 static struct MeshPeerPath *
1120 peer_get_best_path (const struct MeshPeerInfo *peer, const struct MeshTunnel *t)
1122 struct MeshPeerPath *best_p;
1123 struct MeshPeerPath *p;
1124 unsigned int best_cost;
1127 best_p = p = peer->path_head;
1128 best_cost = cost = p->length;
1131 if ((cost = p->length) < best_cost)
1142 * Core callback to write a pre-constructed data packet to core buffer
1144 * @param cls Closure (MeshTransmissionDescriptor with data in "data" member).
1145 * @param size Number of bytes available in buf.
1146 * @param buf Where the to write the message.
1148 * @return number of bytes written to buf
1151 send_core_data_raw (void *cls, size_t size, void *buf)
1153 struct GNUNET_MessageHeader *msg = cls;
1156 GNUNET_assert (NULL != msg);
1157 total_size = ntohs (msg->size);
1159 if (total_size > size)
1164 memcpy (buf, msg, total_size);
1171 * Sends an already built message to a peer, properly registrating
1172 * all used resources.
1174 * @param message Message to send. Function makes a copy of it.
1175 * @param peer Short ID of the neighbor whom to send the message.
1176 * @param t Tunnel on which this message is transmitted.
1179 send_prebuilt_message (const struct GNUNET_MessageHeader *message,
1180 GNUNET_PEER_Id peer,
1181 struct MeshTunnel *t)
1183 struct GNUNET_PeerIdentity id;
1184 struct MeshPeerInfo *neighbor;
1185 struct MeshPeerPath *p;
1190 // GNUNET_TRANSPORT_try_connect(); FIXME use?
1195 size = ntohs (message->size);
1196 data = GNUNET_malloc (size);
1197 memcpy (data, message, size);
1198 type = ntohs(message->type);
1199 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type ||
1200 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type)
1202 struct GNUNET_MESH_Data *u;
1204 u = (struct GNUNET_MESH_Data *) data;
1205 u->ttl = htonl (ntohl (u->ttl) - 1);
1207 GNUNET_PEER_resolve (peer, &id);
1208 neighbor = peer_get (&id);
1209 for (p = neighbor->path_head; NULL != p; p = p->next)
1219 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1220 " %s IS NOT DIRECTLY CONNECTED\n",
1222 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1225 for (p = neighbor->path_head; NULL != p; p = p->next)
1227 struct GNUNET_PeerIdentity debug_id;
1230 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1231 " path with %u hops through:\n",
1233 for (i = 0; i < p->length; i++)
1235 GNUNET_PEER_resolve(p->peers[i], &debug_id);
1236 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1238 i, GNUNET_i2s(&debug_id));
1242 GNUNET_break (0); // FIXME sometimes fails (testing disconnect?)
1243 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1244 " no direct connection to %s\n",
1249 if (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK == type)
1260 * Sends a CREATE PATH message for a path to a peer, properly registrating
1261 * all used resources.
1263 * @param t Tunnel for which the path is created.
1266 send_create_path (struct MeshTunnel *t)
1268 struct MeshPeerInfo *neighbor;
1270 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send create path\n");
1271 neighbor = peer_get_short (t->next_hop);
1273 GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE,
1274 sizeof (struct GNUNET_MESH_CreateTunnel) +
1275 (t->path->length * sizeof (struct GNUNET_PeerIdentity)),
1278 t->state = MESH_TUNNEL_WAITING;
1283 * Sends a PATH ACK message in reponse to a received PATH_CREATE directed to us.
1285 * @param t Tunnel which to confirm.
1288 send_path_ack (struct MeshTunnel *t)
1290 struct MeshPeerInfo *peer;
1292 peer = peer_get_short (t->prev_hop);
1295 GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
1296 sizeof (struct GNUNET_MESH_PathACK),
1303 * Try to establish a new connection to this peer in the given tunnel.
1304 * If the peer doesn't have any path to it yet, try to get one.
1305 * If the peer already has some path, send a CREATE PATH towards it.
1307 * @param peer PeerInfo of the peer.
1308 * @param t Tunnel for which to create the path, if possible.
1311 peer_connect (struct MeshPeerInfo *peer, struct MeshTunnel *t)
1313 struct MeshPeerPath *p;
1315 if (NULL != peer->path_head)
1317 p = peer_get_best_path (peer, t);
1318 tunnel_use_path (t, p);
1319 send_create_path (t);
1321 else if (NULL == peer->dhtget)
1323 struct GNUNET_PeerIdentity id;
1325 GNUNET_PEER_resolve (peer->id, &id);
1326 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1327 " Starting DHT GET for peer %s\n", GNUNET_i2s (&id));
1328 peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
1329 GNUNET_BLOCK_TYPE_MESH_PEER, /* type */
1330 &id.hashPubKey, /* key to search */
1331 dht_replication_level, /* replication level */
1332 GNUNET_DHT_RO_RECORD_ROUTE |
1333 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
1335 0, /* xquery bits */
1336 &dht_get_id_handler, peer);
1337 t->state = MESH_TUNNEL_SEARCHING;
1341 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1342 "There is no path but the DHT GET is already started.\n");
1348 * Destroy the peer_info and free any allocated resources linked to it
1350 * @param pi The peer_info to destroy.
1352 * @return GNUNET_OK on success
1355 peer_info_destroy (struct MeshPeerInfo *pi)
1357 struct GNUNET_PeerIdentity id;
1358 struct MeshPeerPath *p;
1359 struct MeshPeerPath *nextp;
1362 GNUNET_PEER_resolve (pi->id, &id);
1363 GNUNET_PEER_change_rc (pi->id, -1);
1366 GNUNET_CONTAINER_multihashmap_remove (peers, &id.hashPubKey, pi))
1369 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1370 "removing peer %s, not in hashmap\n", GNUNET_i2s (&id));
1372 if (NULL != pi->dhtget)
1374 GNUNET_DHT_get_stop (pi->dhtget);
1380 GNUNET_CONTAINER_DLL_remove (pi->path_head, pi->path_tail, p);
1384 for (i = 0; i < pi->ntunnels; i++)
1385 tunnel_destroy_empty (pi->tunnels[i]);
1386 GNUNET_array_grow (pi->tunnels, pi->ntunnels, 0);
1393 * Remove all paths that rely on a direct connection between p1 and p2
1394 * from the peer itself and notify all tunnels about it.
1396 * @param peer PeerInfo of affected peer.
1397 * @param p1 GNUNET_PEER_Id of one peer.
1398 * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and
1401 * TODO: optimize (see below)
1404 peer_remove_path (struct MeshPeerInfo *peer, GNUNET_PEER_Id p1,
1407 struct MeshPeerPath *p;
1408 struct MeshPeerPath *next;
1409 struct MeshPeerInfo *peer_d;
1411 unsigned int destroyed;
1414 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path\n");
1416 for (p = peer->path_head; NULL != p; p = next)
1419 for (i = 0; i < (p->length - 1); i++)
1421 if ((p->peers[i] == p1 && p->peers[i + 1] == p2) ||
1422 (p->peers[i] == p2 && p->peers[i + 1] == p1))
1424 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
1434 for (i = 0; i < peer->ntunnels; i++)
1436 d = tunnel_notify_connection_broken (peer->tunnels[i], p1, p2);
1440 peer_d = peer_get_short (d);
1441 next = peer_get_best_path (peer_d, peer->tunnels[i]);
1442 tunnel_use_path (peer->tunnels[i], next);
1443 peer_connect (peer_d, peer->tunnels[i]);
1445 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path END\n");
1450 * Add the path to the peer and update the path used to reach it in case this
1453 * @param peer_info Destination peer to add the path to.
1454 * @param path New path to add. Last peer must be the peer in arg 1.
1455 * Path will be either used of freed if already known.
1456 * @param trusted Do we trust that this path is real?
1459 peer_info_add_path (struct MeshPeerInfo *peer_info, struct MeshPeerPath *path,
1462 struct MeshPeerPath *aux;
1466 if ((NULL == peer_info) || (NULL == path))
1469 path_destroy (path);
1472 if (path->peers[path->length - 1] != peer_info->id)
1475 path_destroy (path);
1478 if (2 >= path->length && GNUNET_NO == trusted)
1480 /* Only allow CORE to tell us about direct paths */
1481 path_destroy (path);
1484 for (l = 1; l < path->length; l++)
1486 if (path->peers[l] == myid)
1488 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shortening path by %u\n", l);
1489 for (l2 = 0; l2 < path->length - l; l2++)
1491 path->peers[l2] = path->peers[l + l2];
1496 GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id));
1501 struct GNUNET_PeerIdentity id;
1503 GNUNET_PEER_resolve (peer_info->id, &id);
1504 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
1505 path->length, GNUNET_i2s (&id));
1508 l = path_get_length (path);
1511 path_destroy (path);
1515 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
1516 for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
1518 l2 = path_get_length (aux);
1521 GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
1522 peer_info->path_tail, aux, path);
1527 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
1529 path_destroy (path);
1534 GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail,
1541 * Add the path to the origin peer and update the path used to reach it in case
1542 * this is the shortest.
1543 * The path is given in peer_info -> destination, therefore we turn the path
1544 * upside down first.
1546 * @param peer_info Peer to add the path to, being the origin of the path.
1547 * @param path New path to add after being inversed.
1548 * Path will be either used or freed.
1549 * @param trusted Do we trust that this path is real?
1552 peer_info_add_path_to_origin (struct MeshPeerInfo *peer_info,
1553 struct MeshPeerPath *path, int trusted)
1556 peer_info_add_path (peer_info, path, trusted);
1561 * Add a tunnel to the list of tunnels a peer participates in.
1562 * Update the tunnel's destination.
1564 * @param p Peer to add to.
1565 * @param t Tunnel to add.
1568 peer_info_add_tunnel (struct MeshPeerInfo *p, struct MeshTunnel *t)
1572 GNUNET_break (t->dest == p->id);
1576 GNUNET_PEER_change_rc (t->dest, 1);
1577 GNUNET_array_append (p->tunnels, p->ntunnels, t);
1582 * Remove a tunnel from the list of tunnels a peer participates in.
1583 * Free the tunnel's destination.
1585 * @param p Peer to clean.
1586 * @param t Tunnel to remove.
1589 peer_info_remove_tunnel (struct MeshPeerInfo *p, struct MeshTunnel *t)
1593 if (t->dest == p->id)
1595 GNUNET_PEER_change_rc (t->dest, -1);
1598 for (i = 0; i < p->ntunnels; i++)
1600 if (p->tunnels[i] == t)
1602 p->tunnels[i] = p->tunnels[p->ntunnels - 1];
1603 GNUNET_array_grow (p->tunnels, p->ntunnels, p->ntunnels - 1);
1611 * Function called if the connection to the peer has been stalled for a while,
1612 * possibly due to a missed ACK. Poll the peer about its ACK status.
1614 * @param cls Closure (poll ctx).
1615 * @param tc TaskContext.
1618 tunnel_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1620 struct MeshFlowControl *fc = cls;
1621 struct GNUNET_MESH_Poll msg;
1622 struct MeshTunnel *t = fc->t;
1623 GNUNET_PEER_Id peer;
1625 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
1626 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1631 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL);
1632 msg.header.size = htons (sizeof (msg));
1633 msg.tid = htonl (t->id.tid);
1634 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
1636 if (fc == &t->prev_fc)
1640 else if (fc == &t->next_fc)
1649 send_prebuilt_message (&msg.header, peer, t);
1650 fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
1651 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
1657 * Build a PeerPath from the paths returned from the DHT, reversing the paths
1658 * to obtain a local peer -> destination path and interning the peer ids.
1660 * @return Newly allocated and created path
1662 static struct MeshPeerPath *
1663 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
1664 unsigned int get_path_length,
1665 const struct GNUNET_PeerIdentity *put_path,
1666 unsigned int put_path_length)
1668 struct MeshPeerPath *p;
1674 GNUNET_PEER_change_rc (myid, 1);
1675 i = get_path_length;
1676 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " GET has %d hops.\n", i);
1677 for (i--; i >= 0; i--)
1679 id = GNUNET_PEER_intern (&get_path[i]);
1680 if (p->length > 0 && id == p->peers[p->length - 1])
1682 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
1683 GNUNET_PEER_change_rc (id, -1);
1687 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from GET: %s.\n",
1688 GNUNET_i2s (&get_path[i]));
1690 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
1691 p->peers[p->length - 1] = id;
1694 i = put_path_length;
1695 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PUT has %d hops.\n", i);
1696 for (i--; i >= 0; i--)
1698 id = GNUNET_PEER_intern (&put_path[i]);
1701 /* PUT path went through us, so discard the path up until now and start
1702 * from here to get a much shorter (and loop-free) path.
1707 if (p->length > 0 && id == p->peers[p->length - 1])
1709 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
1710 GNUNET_PEER_change_rc (id, -1);
1714 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from PUT: %s.\n",
1715 GNUNET_i2s (&put_path[i]));
1717 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
1718 p->peers[p->length - 1] = id;
1722 if (get_path_length > 0)
1723 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of GET: %s)\n",
1724 GNUNET_i2s (&get_path[0]));
1725 if (put_path_length > 0)
1726 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of PUT: %s)\n",
1727 GNUNET_i2s (&put_path[0]));
1728 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " In total: %d hops\n",
1730 for (i = 0; i < p->length; i++)
1732 struct GNUNET_PeerIdentity peer_id;
1734 GNUNET_PEER_resolve (p->peers[i], &peer_id);
1735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u: %s\n", p->peers[i],
1736 GNUNET_i2s (&peer_id));
1744 * Adds a path to the peer_infos of all the peers in the path
1746 * @param p Path to process.
1747 * @param confirmed Whether we know if the path works or not.
1750 path_add_to_peers (struct MeshPeerPath *p, int confirmed)
1754 /* TODO: invert and add */
1755 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
1756 for (i++; i < p->length; i++)
1758 struct MeshPeerInfo *aux;
1759 struct MeshPeerPath *copy;
1761 aux = peer_get_short (p->peers[i]);
1762 copy = path_duplicate (p);
1763 copy->length = i + 1;
1764 peer_info_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
1770 * Send keepalive packets for a peer
1772 * @param cls Closure (tunnel for which to send the keepalive).
1773 * @param tc Notification context.
1776 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
1780 * Search for a tunnel among the incoming tunnels
1782 * @param tid the local id of the tunnel
1784 * @return tunnel handler, NULL if doesn't exist
1786 static struct MeshTunnel *
1787 tunnel_get_incoming (MESH_TunnelNumber tid)
1789 struct GNUNET_HashCode hash;
1791 GNUNET_assert (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV);
1792 GMC_hash32 (tid, &hash);
1793 return GNUNET_CONTAINER_multihashmap_get (incoming_tunnels, &hash);
1798 * Search for a tunnel among the tunnels for a client
1800 * @param c the client whose tunnels to search in
1801 * @param tid the local id of the tunnel
1803 * @return tunnel handler, NULL if doesn't exist
1805 static struct MeshTunnel *
1806 tunnel_get_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid)
1808 if (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1810 return tunnel_get_incoming (tid);
1814 struct GNUNET_HashCode hash;
1816 GMC_hash32 (tid, &hash);
1817 return GNUNET_CONTAINER_multihashmap_get (c->own_tunnels, &hash);
1823 * Search for a tunnel by global ID using PEER_ID
1825 * @param pi owner of the tunnel
1826 * @param tid global tunnel number
1828 * @return tunnel handler, NULL if doesn't exist
1830 static struct MeshTunnel *
1831 tunnel_get_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid)
1833 struct MESH_TunnelID id;
1834 struct GNUNET_HashCode hash;
1839 GNUNET_CRYPTO_hash (&id, sizeof (struct MESH_TunnelID), &hash);
1840 return GNUNET_CONTAINER_multihashmap_get (tunnels, &hash);
1845 * Search for a tunnel by global ID using full PeerIdentities
1847 * @param oid owner of the tunnel
1848 * @param tid global tunnel number
1850 * @return tunnel handler, NULL if doesn't exist
1852 static struct MeshTunnel *
1853 tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid)
1855 return tunnel_get_by_pi (GNUNET_PEER_search (oid), tid);
1860 * Add a client to a tunnel, initializing all needed data structures.
1862 * @param t Tunnel to which add the client.
1863 * @param c Client which to add to the tunnel.
1866 tunnel_add_client (struct MeshTunnel *t, struct MeshClient *c)
1868 struct GNUNET_HashCode hash;
1870 if (NULL != t->client)
1875 GMC_hash32 (t->local_tid_dest, &hash);
1877 GNUNET_CONTAINER_multihashmap_put (c->incoming_tunnels, &hash, t,
1878 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
1884 GNUNET_CONTAINER_multihashmap_put (incoming_tunnels, &hash, t,
1885 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
1895 tunnel_use_path (struct MeshTunnel *t, struct MeshPeerPath *p)
1897 unsigned int own_pos;
1899 for (own_pos = 0; own_pos < p->length; own_pos++)
1901 if (p->peers[own_pos] == myid)
1904 if (own_pos > p->length - 1)
1910 if (own_pos < p->length - 1)
1911 t->next_hop = p->peers[own_pos + 1];
1913 t->next_hop = p->peers[own_pos];
1914 GNUNET_PEER_change_rc (t->next_hop, 1);
1916 t->prev_hop = p->peers[own_pos - 1];
1918 t->prev_hop = p->peers[0];
1919 GNUNET_PEER_change_rc (t->prev_hop, 1);
1921 if (NULL != t->path)
1922 path_destroy (t->path);
1923 t->path = path_duplicate (p);
1926 if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
1927 GNUNET_SCHEDULER_cancel (t->maintenance_task);
1928 t->maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_path_time,
1935 * Notifies a tunnel that a connection has broken that affects at least
1936 * some of its peers. Sends a notification towards the root of the tree.
1937 * In case the peer is the owner of the tree, notifies the client that owns
1938 * the tunnel and tries to reconnect.
1940 * @param t Tunnel affected.
1941 * @param p1 Peer that got disconnected from p2.
1942 * @param p2 Peer that got disconnected from p1.
1944 * @return Short ID of the peer disconnected (either p1 or p2).
1945 * 0 if the tunnel remained unaffected.
1947 static GNUNET_PEER_Id
1948 tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
1951 // if (myid != p1 && myid != p2) FIXME
1956 // if (tree_get_predecessor (t->tree) != 0)
1958 // /* We are the peer still connected, notify owner of the disconnection. */
1959 // struct GNUNET_MESH_PathBroken msg;
1960 // struct GNUNET_PeerIdentity neighbor;
1962 // msg.header.size = htons (sizeof (msg));
1963 // msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN);
1964 // GNUNET_PEER_resolve (t->id.oid, &msg.oid);
1965 // msg.tid = htonl (t->id.tid);
1966 // msg.peer1 = my_full_id;
1967 // GNUNET_PEER_resolve (pid, &msg.peer2);
1968 // GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor);
1969 // send_prebuilt_message (&msg.header, &neighbor, t);
1976 * Build a local ACK message and send it to a local client.
1978 * @param t Tunnel on which to send the ACK.
1979 * @param c Client to whom send the ACK.
1980 * @param ack Value of the ACK.
1981 * @param is_fwd Set to GNUNET_YES for FWD ACK (dest->owner)
1984 send_local_ack (struct MeshTunnel *t,
1985 struct MeshClient *c,
1989 struct GNUNET_MESH_LocalAck msg;
1991 msg.header.size = htons (sizeof (msg));
1992 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
1993 msg.tunnel_id = htonl (is_fwd ? t->local_tid : t->local_tid_dest);
1994 msg.ack = htonl (ack);
1995 GNUNET_SERVER_notification_context_unicast(nc,
2002 * Build an ACK message and queue it to send to the given peer.
2004 * @param t Tunnel on which to send the ACK.
2005 * @param peer Peer to whom send the ACK.
2006 * @param ack Value of the ACK.
2009 send_ack (struct MeshTunnel *t, GNUNET_PEER_Id peer, uint32_t ack)
2011 struct GNUNET_MESH_ACK msg;
2013 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2014 msg.header.size = htons (sizeof (msg));
2015 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK);
2016 msg.pid = htonl (ack);
2017 msg.tid = htonl (t->id.tid);
2019 send_prebuilt_message (&msg.header, peer, t);
2024 * Send an end-to-end FWD ACK message for the most recent in-sequence payload.
2026 * @param t Tunnel this is about.
2029 tunnel_send_fwd_data_ack (struct MeshTunnel *t)
2031 struct GNUNET_MESH_DataACK msg;
2033 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_DATA_ACK);
2034 msg.header.size = htons (sizeof (msg));
2035 msg.tid = htonl (t->id.tid);
2036 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2037 msg.pid = htonl (t->prev_fc.last_pid_recv);
2038 msg.futures = 0; // FIXME set bits of other newer messages received
2040 send_prebuilt_message (&msg.header, t->prev_hop, t);
2045 * Send an end-to-end BCK ACK message for the most recent in-sequence payload.
2047 * @param t Tunnel this is about.
2050 tunnel_send_bck_data_ack (struct MeshTunnel *t)
2052 struct GNUNET_MESH_DataACK msg;
2054 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_DATA_ACK);
2055 msg.header.size = htons (sizeof (msg));
2056 msg.tid = htonl (t->id.tid);
2057 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2058 msg.pid = htonl (t->next_fc.last_pid_recv);
2059 msg.futures = 0; // FIXME set bits of other newer messages received
2061 send_prebuilt_message (&msg.header, t->next_hop, t);
2066 * Send an ACK informing the predecessor about the available buffer space.
2067 * In case there is no predecessor, inform the owning client.
2068 * If buffering is off, send only on behalf of children or self if endpoint.
2069 * If buffering is on, send when sent to children and buffer space is free.
2070 * Note that although the name is fwd_ack, the FWD mean forward *traffic*,
2071 * the ACK itself goes "back" (towards root).
2073 * @param t Tunnel on which to send the ACK.
2074 * @param type Type of message that triggered the ACK transmission.
2077 tunnel_send_fwd_ack (struct MeshTunnel *t, uint16_t type)
2081 /* Is it after unicast retransmission? */
2084 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
2085 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2086 "ACK due to FWD DATA retransmission\n");
2087 if (GNUNET_YES == t->nobuffer)
2089 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, nobuffer\n");
2093 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2094 if (NULL != t->owner && GNUNET_YES == t->reliable)
2096 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
2098 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
2099 tunnel_send_fwd_data_ack (t);
2101 case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
2102 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2103 t->force_ack = GNUNET_YES;
2109 /* Check if we need to transmit the ACK */
2110 if (t->queue_max > t->next_fc.queue_n * 4 &&
2111 GMC_is_pid_bigger(t->prev_fc.last_ack_sent, t->prev_fc.last_pid_recv) &&
2112 GNUNET_NO == t->force_ack)
2114 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer free\n");
2115 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2116 " t->qmax: %u, t->qn: %u\n",
2117 t->queue_max, t->next_fc.queue_n);
2118 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2119 " t->pid: %u, t->ack: %u\n",
2120 t->prev_fc.last_pid_recv, t->prev_fc.last_ack_sent);
2124 /* Ok, ACK might be necessary, what PID to ACK? */
2125 ack = t->prev_fc.last_pid_recv + t->queue_max - t->next_fc.queue_n;
2126 if (ack == t->prev_fc.last_ack_sent && GNUNET_NO == t->force_ack)
2128 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
2132 t->prev_fc.last_ack_sent = ack;
2133 if (NULL != t->owner)
2134 send_local_ack (t, t->owner, ack, GNUNET_YES);
2135 else if (0 != t->prev_hop)
2136 send_ack (t, t->prev_hop, ack);
2140 t->force_ack = GNUNET_NO;
2145 * Send an ACK informing the children node/client about the available
2147 * If buffering is off, send only on behalf of root (can be self).
2148 * If buffering is on, send when sent to predecessor and buffer space is free.
2149 * Note that although the name is bck_ack, the BCK mean backwards *traffic*,
2150 * the ACK itself goes "forward" (towards children/clients).
2152 * @param t Tunnel on which to send the ACK.
2153 * @param type Type of message that triggered the ACK transmission.
2156 tunnel_send_bck_ack (struct MeshTunnel *t, uint16_t type)
2159 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2160 "Sending BCK ACK on tunnel %u [%u] due to %s\n",
2161 t->id.oid, t->id.tid, GNUNET_MESH_DEBUG_M2S(type));
2162 /* Is it after data to_origin retransmission? */
2165 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
2166 if (GNUNET_YES == t->nobuffer)
2168 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2169 " Not sending ACK, nobuffer + traffic\n");
2173 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2174 if (NULL != t->client && GNUNET_YES == t->reliable)
2176 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
2178 case GNUNET_MESSAGE_TYPE_MESH_DATA_ACK:
2179 tunnel_send_bck_data_ack (t);
2181 case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
2182 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2183 t->force_ack = GNUNET_YES;
2189 /* TODO: Check if we need to transmit the ACK (as in fwd) */
2191 ack = t->next_fc.last_pid_recv + t->queue_max - t->prev_fc.queue_n;
2193 if (t->next_fc.last_ack_sent == ack && GNUNET_NO == t->force_ack)
2195 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2196 " Not sending ACK, not needed, last ack sent was %u\n",
2197 t->next_fc.last_ack_sent);
2200 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2201 " Sending BCK ACK %u (last sent: %u)\n",
2202 ack, t->next_fc.last_ack_sent);
2203 t->next_fc.last_ack_sent = ack;
2205 if (NULL != t->client)
2206 send_local_ack (t, t->client, ack, GNUNET_NO);
2207 else if (0 != t->next_hop)
2208 send_ack (t, t->next_hop, ack);
2211 t->force_ack = GNUNET_NO;
2216 * Modify the unicast message TID from global to local and send to client.
2218 * @param t Tunnel on which to send the message.
2219 * @param msg Message to modify and send.
2222 tunnel_send_client_ucast (struct MeshTunnel *t,
2223 const struct GNUNET_MESH_Data *msg)
2225 struct GNUNET_MESH_Data *copy;
2226 uint16_t size = ntohs (msg->header.size);
2229 if (size < sizeof (struct GNUNET_MESH_Data) +
2230 sizeof (struct GNUNET_MessageHeader))
2232 GNUNET_break_op (0);
2235 if (NULL == t->client)
2240 copy = (struct GNUNET_MESH_Data *) cbuf;
2241 memcpy (copy, msg, size);
2242 copy->tid = htonl (t->local_tid_dest);
2243 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
2244 ©->header, GNUNET_NO);
2249 * Modify the to_origin message TID from global to local and send to client.
2251 * @param t Tunnel on which to send the message.
2252 * @param msg Message to modify and send.
2255 tunnel_send_client_to_orig (struct MeshTunnel *t,
2256 const struct GNUNET_MESH_Data *msg)
2258 struct GNUNET_MESH_Data *copy;
2259 uint16_t size = ntohs (msg->header.size);
2262 if (size < sizeof (struct GNUNET_MESH_Data) +
2263 sizeof (struct GNUNET_MessageHeader))
2265 GNUNET_break_op (0);
2268 if (NULL == t->owner)
2273 copy = (struct GNUNET_MESH_Data *) cbuf;
2274 memcpy (cbuf, msg, size);
2275 copy->tid = htonl (t->local_tid);
2276 GNUNET_SERVER_notification_context_unicast (nc, t->owner->handle,
2277 ©->header, GNUNET_NO);
2282 * We haven't received an ACK after a certain time: restransmit the message.
2284 * @param cls Closure (MeshSentMessage with the message to restransmit)
2285 * @param tc TaskContext.
2288 tunnel_retransmit_message (void *cls,
2289 const struct GNUNET_SCHEDULER_TaskContext *tc)
2291 struct MeshSentMessage *copy = cls;
2292 struct GNUNET_MESH_Data *payload;
2295 copy->retry_task = GNUNET_SCHEDULER_NO_TASK;
2296 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2299 payload = (struct GNUNET_MESH_Data *) ©[1];
2300 hop = copy->is_forward ? copy->t->next_hop : copy->t->prev_hop;
2301 send_prebuilt_message (&payload->header, hop, copy->t);
2302 GNUNET_STATISTICS_update (stats, "# unicast retransmitted", 1, GNUNET_NO);
2303 copy->retry_timer = GNUNET_TIME_STD_BACKOFF (copy->retry_timer);
2304 copy->retry_task = GNUNET_SCHEDULER_add_delayed (copy->retry_timer,
2305 &tunnel_retransmit_message,
2311 * @brief Re-initiate traffic to this peer if necessary.
2313 * Check if there is traffic queued towards this peer
2314 * and the core transmit handle is NULL (traffic was stalled).
2315 * If so, call core tmt rdy.
2317 * @param peer_id Short ID of peer to which initiate traffic.
2320 peer_unlock_queue(GNUNET_PEER_Id peer_id)
2322 struct MeshPeerInfo *peer;
2323 struct GNUNET_PeerIdentity id;
2324 struct MeshPeerQueue *q;
2327 peer = peer_get_short (peer_id);
2328 if (NULL != peer->core_transmit)
2331 q = queue_get_next (peer);
2334 /* Might br multicast traffic already sent to this particular peer but
2335 * not to other children in this tunnel.
2336 * This way t->queue_n would be > 0 but the queue of this particular peer
2342 GNUNET_PEER_resolve (peer->id, &id);
2343 peer->core_transmit =
2344 GNUNET_CORE_notify_transmit_ready(core_handle,
2347 GNUNET_TIME_UNIT_FOREVER_REL,
2357 * Send a message to all peers and clients in this tunnel that the tunnel
2358 * is no longer valid. If some peer or client should not receive the message,
2359 * should be zero'ed out before calling this function.
2361 * @param t The tunnel whose peers and clients to notify.
2364 tunnel_send_destroy (struct MeshTunnel *t)
2366 struct GNUNET_MESH_TunnelDestroy msg;
2367 struct GNUNET_PeerIdentity id;
2369 msg.header.size = htons (sizeof (msg));
2370 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);
2371 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2372 msg.tid = htonl (t->id.tid);
2373 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2374 " sending tunnel destroy for tunnel: %s [%X]\n",
2375 GNUNET_i2s (&msg.oid), t->id.tid);
2377 if (NULL == t->client && 0 != t->next_hop)
2379 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " child: %u\n", t->next_hop);
2380 GNUNET_PEER_resolve (t->next_hop, &id);
2381 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2382 " sending forward to %s\n",
2384 send_prebuilt_message (&msg.header, t->next_hop, t);
2386 if (NULL == t->owner && 0 != t->prev_hop)
2388 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " parent: %u\n", t->prev_hop);
2389 GNUNET_PEER_resolve (t->prev_hop, &id);
2390 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2391 " sending back to %s\n",
2393 send_prebuilt_message (&msg.header, t->prev_hop, t);
2395 if (NULL != t->owner)
2397 send_client_tunnel_destroy (t->owner, t);
2399 if (NULL != t->client)
2401 send_client_tunnel_destroy (t->client, t);
2407 * Cancel all transmissions towards a neighbor that belongs to a certain tunnel.
2409 * @param t Tunnel which to cancel.
2410 * @param neighbor Short ID of the neighbor to whom cancel the transmissions.
2413 peer_cancel_queues (GNUNET_PEER_Id neighbor, struct MeshTunnel *t)
2415 struct MeshPeerInfo *peer_info;
2416 struct MeshPeerQueue *pq;
2417 struct MeshPeerQueue *next;
2420 return; /* Was local peer, 0'ed in tunnel_destroy_iterator */
2421 peer_info = peer_get_short (neighbor);
2422 for (pq = peer_info->queue_head; NULL != pq; pq = next)
2425 if (pq->tunnel == t)
2427 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == pq->type ||
2428 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == pq->type)
2430 /* Should have been removed on destroy children */
2433 queue_destroy (pq, GNUNET_YES);
2436 if (NULL == peer_info->queue_head && NULL != peer_info->core_transmit)
2438 GNUNET_CORE_notify_transmit_ready_cancel(peer_info->core_transmit);
2439 peer_info->core_transmit = NULL;
2445 * Destroy the tunnel.
2447 * This function does not generate any warning traffic to clients or peers.
2450 * Remove the tunnel from peer_info's and clients' hashmaps.
2451 * Cancel messages belonging to this tunnel queued to neighbors.
2452 * Free any allocated resources linked to the tunnel.
2454 * @param t the tunnel to destroy
2456 * @return GNUNET_OK on success
2459 tunnel_destroy (struct MeshTunnel *t)
2461 struct MeshClient *c;
2462 struct GNUNET_HashCode hash;
2472 struct GNUNET_PeerIdentity id;
2474 GNUNET_PEER_resolve (t->id.oid, &id);
2475 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s [%x]\n",
2476 GNUNET_i2s (&id), t->id.tid);
2478 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
2482 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2483 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t))
2491 GMC_hash32 (t->local_tid, &hash);
2493 GNUNET_CONTAINER_multihashmap_remove (c->own_tunnels, &hash, t))
2500 if (NULL != t->client)
2503 GMC_hash32 (t->local_tid_dest, &hash);
2505 GNUNET_CONTAINER_multihashmap_remove (c->incoming_tunnels, &hash, t))
2511 GNUNET_CONTAINER_multihashmap_remove (incoming_tunnels, &hash, t))
2518 if (0 != t->prev_hop)
2520 peer_cancel_queues (t->prev_hop, t);
2521 GNUNET_PEER_change_rc (t->prev_hop, -1);
2523 if (0 != t->next_hop)
2525 peer_cancel_queues (t->next_hop, t);
2526 GNUNET_PEER_change_rc (t->next_hop, -1);
2529 peer_info_remove_tunnel (peer_get_short (t->dest), t);
2532 if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
2533 GNUNET_SCHEDULER_cancel (t->maintenance_task);
2536 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
2537 path_destroy (t->path);
2543 * Tunnel is empty: destroy it.
2545 * Notifies all participants (peers, cleints) about the destruction.
2547 * @param t Tunnel to destroy.
2550 tunnel_destroy_empty (struct MeshTunnel *t)
2554 struct GNUNET_PeerIdentity id;
2556 GNUNET_PEER_resolve (t->id.oid, &id);
2557 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2558 "executing destruction of empty tunnel %s [%X]\n",
2559 GNUNET_i2s (&id), t->id.tid);
2563 if (GNUNET_NO == t->destroy)
2564 tunnel_send_destroy (t);
2565 if (0 == t->pending_messages)
2568 t->destroy = GNUNET_YES;
2572 * Initialize a Flow Control structure to the initial state.
2574 * @param fc Flow Control structure to initialize.
2577 fc_init (struct MeshFlowControl *fc)
2579 fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
2580 fc->last_pid_recv = (uint32_t) -1;
2581 fc->last_ack_sent = (uint32_t) -1; /* No traffic allowed yet */
2582 fc->last_ack_recv = (uint32_t) -1;
2583 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2584 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
2589 * Create a new tunnel
2591 * @param owner Who is the owner of the tunnel (short ID).
2592 * @param tid Tunnel Number of the tunnel.
2593 * @param client Clients that owns the tunnel, NULL for foreign tunnels.
2594 * @param local Tunnel Number for the tunnel, for the client point of view.
2596 * @return A new initialized tunnel. NULL on error.
2598 static struct MeshTunnel *
2599 tunnel_new (GNUNET_PEER_Id owner,
2600 MESH_TunnelNumber tid,
2601 struct MeshClient *client,
2602 MESH_TunnelNumber local)
2604 struct MeshTunnel *t;
2605 struct GNUNET_HashCode hash;
2607 if (n_tunnels >= max_tunnels && NULL == client)
2610 t = GNUNET_malloc (sizeof (struct MeshTunnel));
2613 t->queue_max = (max_msgs_queue / max_tunnels) + 1;
2615 fc_init (&t->next_fc);
2616 fc_init (&t->prev_fc);
2617 t->local_tid = local;
2619 GNUNET_STATISTICS_update (stats, "# tunnels", 1, GNUNET_NO);
2621 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2623 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
2624 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2631 GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR);
2638 GMC_hash32 (t->local_tid, &hash);
2640 GNUNET_CONTAINER_multihashmap_put (client->own_tunnels, &hash, t,
2641 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2645 GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR);
2655 * Set options in a tunnel, extracted from a bit flag field
2657 * @param t Tunnel to set options to.
2658 * @param options Bit array in host byte order.
2661 tunnel_set_options (struct MeshTunnel *t, uint32_t options)
2663 t->nobuffer = options & GNUNET_MESH_OPTION_NOBUFFER;
2664 t->reliable = options & GNUNET_MESH_OPTION_RELIABLE;
2669 * Iterator for deleting each tunnel whose client endpoint disconnected.
2671 * @param cls Closure (client that has disconnected).
2672 * @param key The hash of the local tunnel id (used to access the hashmap).
2673 * @param value The value stored at the key (tunnel to destroy).
2675 * @return GNUNET_OK, keep iterating.
2678 tunnel_destroy_iterator (void *cls,
2679 const struct GNUNET_HashCode * key,
2682 struct MeshTunnel *t = value;
2683 struct MeshClient *c = cls;
2685 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2686 " Tunnel %X / %X destroy, due to client %u shutdown.\n",
2687 t->local_tid, t->local_tid_dest, c->id);
2688 client_delete_tunnel (c, t);
2691 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is destination.\n", c->id);
2693 if (0 != t->next_hop) { /* destroy could come before a path is used */
2694 GNUNET_PEER_change_rc (t->next_hop, -1);
2698 else if (c == t->owner)
2700 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is owner.\n", c->id);
2702 if (0 != t->prev_hop) { /* destroy could come before a path is used */
2703 GNUNET_PEER_change_rc (t->prev_hop, -1);
2711 tunnel_destroy_empty (t);
2718 * Timeout function, destroys tunnel if called
2720 * @param cls Closure (tunnel to destroy).
2721 * @param tc TaskContext
2724 tunnel_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2726 struct MeshTunnel *t = cls;
2727 struct GNUNET_PeerIdentity id;
2729 t->maintenance_task = GNUNET_SCHEDULER_NO_TASK;
2730 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2732 GNUNET_PEER_resolve(t->id.oid, &id);
2733 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2734 "Tunnel %s [%X] timed out. Destroying.\n",
2735 GNUNET_i2s(&id), t->id.tid);
2736 if (NULL != t->client)
2737 send_client_tunnel_destroy (t->client, t);
2738 tunnel_destroy (t); /* Do not notify other */
2743 * Resets the tunnel timeout. Starts it if no timeout was running.
2745 * @param t Tunnel whose timeout to reset.
2747 * TODO use heap to improve efficiency of scheduler.
2750 tunnel_reset_timeout (struct MeshTunnel *t)
2752 if (NULL != t->owner || 0 != t->local_tid || 0 == t->prev_hop)
2754 if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
2755 GNUNET_SCHEDULER_cancel (t->maintenance_task);
2756 t->maintenance_task =
2757 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
2758 (refresh_path_time, 4), &tunnel_timeout, t);
2762 /******************************************************************************/
2763 /**************** MESH NETWORK HANDLER HELPERS ***********************/
2764 /******************************************************************************/
2767 * Function to send a create path packet to a peer.
2769 * @param cls closure
2770 * @param size number of bytes available in buf
2771 * @param buf where the callee should write the message
2772 * @return number of bytes written to buf
2775 send_core_path_create (void *cls, size_t size, void *buf)
2777 struct MeshTunnel *t = cls;
2778 struct GNUNET_MESH_CreateTunnel *msg;
2779 struct GNUNET_PeerIdentity *peer_ptr;
2780 struct MeshPeerPath *p = t->path;
2785 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATE PATH sending...\n");
2787 sizeof (struct GNUNET_MESH_CreateTunnel) +
2788 p->length * sizeof (struct GNUNET_PeerIdentity);
2790 if (size < size_needed || NULL == buf)
2795 msg = (struct GNUNET_MESH_CreateTunnel *) buf;
2796 msg->header.size = htons (size_needed);
2797 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE);
2798 msg->tid = ntohl (t->id.tid);
2801 if (GNUNET_YES == t->nobuffer)
2802 opt |= GNUNET_MESH_OPTION_NOBUFFER;
2803 if (GNUNET_YES == t->reliable)
2804 opt |= GNUNET_MESH_OPTION_RELIABLE;
2805 msg->opt = htonl (opt);
2806 msg->port = htonl (t->port);
2808 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
2809 for (i = 0; i < p->length; i++)
2811 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
2814 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2815 "CREATE PATH (%u bytes long) sent!\n", size_needed);
2821 * Creates a path ack message in buf and frees all unused resources.
2823 * @param cls closure (MeshTransmissionDescriptor)
2824 * @param size number of bytes available in buf
2825 * @param buf where the callee should write the message
2826 * @return number of bytes written to buf
2829 send_core_path_ack (void *cls, size_t size, void *buf)
2831 struct MeshTunnel *t = cls;
2832 struct GNUNET_MESH_PathACK *msg = buf;
2834 GNUNET_assert (NULL != t);
2835 if (sizeof (struct GNUNET_MESH_PathACK) > size)
2840 t->prev_fc.last_ack_sent = t->nobuffer ? 0 : t->queue_max - 1;
2841 msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK));
2842 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
2843 GNUNET_PEER_resolve (t->id.oid, &msg->oid);
2844 msg->tid = htonl (t->id.tid);
2845 msg->peer_id = my_full_id;
2846 msg->ack = htonl (t->prev_fc.last_ack_sent);
2848 /* TODO add signature */
2850 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "PATH ACK sent!\n");
2851 return sizeof (struct GNUNET_MESH_PathACK);
2856 * Free a transmission that was already queued with all resources
2857 * associated to the request.
2859 * @param queue Queue handler to cancel.
2860 * @param clear_cls Is it necessary to free associated cls?
2863 queue_destroy (struct MeshPeerQueue *queue, int clear_cls)
2865 struct MeshFlowControl *fc;
2867 if (GNUNET_YES == clear_cls)
2869 switch (queue->type)
2871 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
2872 GNUNET_log (GNUNET_ERROR_TYPE_INFO, " cancelling TUNNEL_DESTROY\n");
2873 GNUNET_break (GNUNET_YES == queue->tunnel->destroy);
2875 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
2876 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
2877 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2878 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2879 case GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE:
2880 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2881 " prebuilt message\n");
2882 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2884 GNUNET_MESH_DEBUG_M2S (queue->type));
2886 case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
2887 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type create path\n");
2891 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2892 " type %s unknown!\n",
2893 GNUNET_MESH_DEBUG_M2S (queue->type));
2895 GNUNET_free_non_null (queue->cls);
2897 GNUNET_CONTAINER_DLL_remove (queue->peer->queue_head,
2898 queue->peer->queue_tail,
2901 /* Delete from appropriate fc in the tunnel */
2902 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == queue->type ||
2903 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == queue->type )
2905 if (queue->peer->id == queue->tunnel->prev_hop)
2906 fc = &queue->tunnel->prev_fc;
2907 else if (queue->peer->id == queue->tunnel->next_hop)
2908 fc = &queue->tunnel->next_fc;
2916 GNUNET_free (queue);
2921 * @brief Get the next transmittable message from the queue.
2923 * This will be the head, except in the case of being a data packet
2924 * not allowed by the destination peer.
2926 * @param peer Destination peer.
2928 * @return The next viable MeshPeerQueue element to send to that peer.
2929 * NULL when there are no transmittable messages.
2931 struct MeshPeerQueue *
2932 queue_get_next (const struct MeshPeerInfo *peer)
2934 struct MeshPeerQueue *q;
2936 struct GNUNET_MESH_Data *dmsg;
2937 struct MeshTunnel* t;
2941 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* selecting message\n");
2942 for (q = peer->queue_head; NULL != q; q = q->next)
2945 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2947 GNUNET_MESH_DEBUG_M2S (q->type));
2948 dmsg = (struct GNUNET_MESH_Data *) q->cls;
2949 pid = ntohl (dmsg->pid);
2952 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
2953 ack = t->next_fc.last_ack_recv;
2955 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
2956 ack = t->prev_fc.last_ack_recv;
2959 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2963 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2964 "* ACK: %u, PID: %u\n",
2966 if (GNUNET_NO == GMC_is_pid_bigger (pid, ack))
2968 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2974 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2978 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2979 "* nothing found\n");
2985 queue_send (void *cls, size_t size, void *buf)
2987 struct MeshPeerInfo *peer = cls;
2988 struct GNUNET_MessageHeader *msg;
2989 struct MeshPeerQueue *queue;
2990 struct MeshTunnel *t;
2991 struct GNUNET_PeerIdentity dst_id;
2992 struct MeshFlowControl *fc;
2997 peer->core_transmit = NULL;
2999 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Queue send\n");
3000 queue = queue_get_next (peer);
3002 /* Queue has no internal mesh traffic nor sendable payload */
3005 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not ready, return\n");
3006 if (NULL == peer->queue_head)
3007 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
3010 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not empty\n");
3012 GNUNET_PEER_resolve (peer->id, &dst_id);
3013 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3015 GNUNET_i2s (&dst_id));
3016 /* Check if buffer size is enough for the message */
3017 if (queue->size > size)
3019 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3020 "* not enough room, reissue\n");
3021 peer->core_transmit =
3022 GNUNET_CORE_notify_transmit_ready (core_handle,
3025 GNUNET_TIME_UNIT_FOREVER_REL,
3032 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* size ok\n");
3035 GNUNET_assert (0 < t->pending_messages);
3036 t->pending_messages--;
3040 switch (queue->type)
3043 case GNUNET_MESSAGE_TYPE_MESH_ACK:
3044 case GNUNET_MESSAGE_TYPE_MESH_POLL:
3045 case GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN:
3046 case GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY:
3047 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
3048 case GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE:
3049 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3051 GNUNET_MESH_DEBUG_M2S (queue->type));
3053 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3054 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3055 data_size = send_core_data_raw (queue->cls, size, buf);
3056 msg = (struct GNUNET_MessageHeader *) buf;
3057 type = ntohs (msg->type);
3059 case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
3060 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path create\n");
3061 data_size = send_core_path_create (queue->cls, size, buf);
3063 case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
3064 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n");
3065 data_size = send_core_path_ack (queue->cls, size, buf);
3069 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3070 "* type unknown: %u\n",
3075 if (0 < drop_percent &&
3076 GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
3078 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3079 "Dropping message of type %s\n",
3080 GNUNET_MESH_DEBUG_M2S(queue->type));
3083 /* Free queue, but cls was freed by send_core_* */
3084 queue_destroy (queue, GNUNET_NO);
3086 /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
3087 pid = ((struct GNUNET_MESH_Data *) buf)->pid;
3090 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3091 t->next_fc.last_pid_sent = pid;
3092 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST);
3094 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3095 t->prev_fc.last_pid_sent = pid;
3096 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
3102 if (GNUNET_YES == t->destroy && 0 == t->pending_messages)
3104 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying tunnel!\n");
3108 /* If more data in queue, send next */
3109 queue = queue_get_next (peer);
3112 struct GNUNET_PeerIdentity id;
3114 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* more data!\n");
3115 GNUNET_PEER_resolve (peer->id, &id);
3116 peer->core_transmit =
3117 GNUNET_CORE_notify_transmit_ready(core_handle,
3120 GNUNET_TIME_UNIT_FOREVER_REL,
3126 else if (NULL != peer->queue_head)
3128 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3130 GNUNET_i2s (&my_full_id));
3131 if (peer->id == t->next_hop)
3133 else if (peer->id == t->prev_hop)
3140 if (NULL != fc && GNUNET_SCHEDULER_NO_TASK == fc->poll_task)
3143 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
3147 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Return %d\n", data_size);
3153 * @brief Queue and pass message to core when possible.
3155 * If type is payload (UNICAST, TO_ORIGIN) checks for queue status and
3156 * accounts for it. In case the queue is full, the message is dropped and
3159 * Otherwise, message is treated as internal and allowed to go regardless of
3162 * @param cls Closure (@c type dependant). It will be used by queue_send to
3163 * build the message to be sent if not already prebuilt.
3164 * @param type Type of the message, 0 for a raw message.
3165 * @param size Size of the message.
3166 * @param dst Neighbor to send message to.
3167 * @param t Tunnel this message belongs to.
3170 queue_add (void *cls, uint16_t type, size_t size,
3171 struct MeshPeerInfo *dst, struct MeshTunnel *t)
3173 struct MeshPeerQueue *queue;
3174 struct GNUNET_PeerIdentity id;
3178 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type)
3180 n = &t->next_fc.queue_n;
3182 else if (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type)
3184 n = &t->prev_fc.queue_n;
3188 if (*n >= t->queue_max)
3191 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3192 "queue full: %u/%u\n",
3194 GNUNET_STATISTICS_update(stats,
3195 "# messages dropped (buffer full)",
3197 return; /* Drop message */
3201 queue = GNUNET_malloc (sizeof (struct MeshPeerQueue));
3207 GNUNET_CONTAINER_DLL_insert_tail (dst->queue_head, dst->queue_tail, queue);
3208 if (NULL == dst->core_transmit)
3210 GNUNET_PEER_resolve (dst->id, &id);
3211 dst->core_transmit =
3212 GNUNET_CORE_notify_transmit_ready (core_handle,
3215 GNUNET_TIME_UNIT_FOREVER_REL,
3221 t->pending_messages++;
3225 /******************************************************************************/
3226 /******************** MESH NETWORK HANDLERS **************************/
3227 /******************************************************************************/
3231 * Core handler for path creation
3233 * @param cls closure
3234 * @param message message
3235 * @param peer peer identity this notification is about
3237 * @return GNUNET_OK to keep the connection open,
3238 * GNUNET_SYSERR to close it (signal serious error)
3241 handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer,
3242 const struct GNUNET_MessageHeader *message)
3244 unsigned int own_pos;
3247 MESH_TunnelNumber tid;
3248 struct GNUNET_MESH_CreateTunnel *msg;
3249 struct GNUNET_PeerIdentity *pi;
3250 struct MeshPeerPath *path;
3251 struct MeshPeerInfo *dest_peer_info;
3252 struct MeshPeerInfo *orig_peer_info;
3253 struct MeshTunnel *t;
3255 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3256 "Received a path create msg [%s]\n",
3257 GNUNET_i2s (&my_full_id));
3258 size = ntohs (message->size);
3259 if (size < sizeof (struct GNUNET_MESH_CreateTunnel))
3261 GNUNET_break_op (0);
3265 size -= sizeof (struct GNUNET_MESH_CreateTunnel);
3266 if (size % sizeof (struct GNUNET_PeerIdentity))
3268 GNUNET_break_op (0);
3271 size /= sizeof (struct GNUNET_PeerIdentity);
3274 GNUNET_break_op (0);
3277 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
3278 msg = (struct GNUNET_MESH_CreateTunnel *) message;
3280 tid = ntohl (msg->tid);
3281 pi = (struct GNUNET_PeerIdentity *) &msg[1];
3282 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3283 " path is for tunnel %s[%X].\n", GNUNET_i2s (pi), tid);
3284 t = tunnel_get (pi, tid);
3285 if (NULL == t) /* might be a local tunnel */
3289 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating tunnel\n");
3290 t = tunnel_new (GNUNET_PEER_intern (pi), tid, NULL, 0);
3296 t->port = ntohl (msg->port);
3297 opt = ntohl (msg->opt);
3298 if (0 != (opt & GNUNET_MESH_OPTION_NOBUFFER))
3300 t->nobuffer = GNUNET_YES;
3303 if (0 != (opt & GNUNET_MESH_OPTION_RELIABLE))
3305 t->reliable = GNUNET_YES;
3307 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " nobuffer:%d\n", t->nobuffer);
3309 tunnel_reset_timeout (t);
3311 t->state = MESH_TUNNEL_WAITING;
3313 GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey);
3314 if (NULL == dest_peer_info)
3316 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3317 " Creating PeerInfo for destination.\n");
3318 dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
3319 dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]);
3320 GNUNET_CONTAINER_multihashmap_put (peers, &pi[size - 1].hashPubKey,
3322 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
3324 orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey);
3325 if (NULL == orig_peer_info)
3327 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3328 " Creating PeerInfo for origin.\n");
3329 orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
3330 orig_peer_info->id = GNUNET_PEER_intern (pi);
3331 GNUNET_CONTAINER_multihashmap_put (peers, &pi->hashPubKey, orig_peer_info,
3332 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
3334 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
3335 path = path_new (size);
3337 for (i = 0; i < size; i++)
3339 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n",
3340 GNUNET_i2s (&pi[i]));
3341 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
3342 if (path->peers[i] == myid)
3345 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
3346 if (own_pos == 0 && path->peers[own_pos] != myid)
3348 /* create path: self not found in path through self */
3349 GNUNET_break_op (0);
3350 path_destroy (path);
3354 path_add_to_peers (path, GNUNET_NO);
3355 tunnel_use_path (t, path);
3357 peer_info_add_tunnel (dest_peer_info, t);
3359 if (own_pos == size - 1)
3361 struct MeshClient *c;
3362 struct GNUNET_HashCode hc;
3364 /* Find target client */
3365 GMC_hash32 (t->port, &hc);
3366 c = GNUNET_CONTAINER_multihashmap_get (ports, &hc);
3369 /* TODO send reject */
3373 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
3374 peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_YES);
3376 /* Assign local tid */
3377 while (NULL != tunnel_get_incoming (next_local_tid))
3378 next_local_tid = (next_local_tid + 1) | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
3379 t->local_tid_dest = next_local_tid++;
3380 next_local_tid = next_local_tid | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
3382 if (GNUNET_YES == t->reliable)
3383 t->sent_messages_bck =
3384 GNUNET_CONTAINER_multihashmap32_create (t->queue_max);
3386 tunnel_add_client (t, c);
3387 send_client_tunnel_create (t);
3392 struct MeshPeerPath *path2;
3394 t->next_hop = path->peers[own_pos + 1];
3395 GNUNET_PEER_change_rc(t->next_hop, 1);
3397 /* It's for somebody else! Retransmit. */
3398 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
3399 path2 = path_duplicate (path);
3400 peer_info_add_path (dest_peer_info, path2, GNUNET_NO);
3401 peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_NO);
3402 send_create_path (t);
3410 * Core handler for path ACKs
3412 * @param cls closure
3413 * @param message message
3414 * @param peer peer identity this notification is about
3416 * @return GNUNET_OK to keep the connection open,
3417 * GNUNET_SYSERR to close it (signal serious error)
3420 handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
3421 const struct GNUNET_MessageHeader *message)
3423 struct GNUNET_MESH_PathACK *msg;
3424 struct MeshPeerInfo *peer_info;
3425 struct MeshPeerPath *p;
3426 struct MeshTunnel *t;
3428 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a path ACK msg [%s]\n",
3429 GNUNET_i2s (&my_full_id));
3430 msg = (struct GNUNET_MESH_PathACK *) message;
3431 t = tunnel_get (&msg->oid, ntohl(msg->tid));
3434 /* TODO notify that we don't know the tunnel */
3435 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel", 1, GNUNET_NO);
3436 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't know the tunnel %s [%X]!\n",
3437 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3440 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %s [%X]\n",
3441 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3443 peer_info = peer_get (&msg->peer_id);
3444 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by peer %s\n",
3445 GNUNET_i2s (&msg->peer_id));
3446 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n",
3449 /* Add path to peers? */
3453 path_add_to_peers (p, GNUNET_YES);
3459 t->state = MESH_TUNNEL_READY;
3460 t->next_fc.last_ack_recv = (NULL == t->client) ? ntohl (msg->ack) : 0;
3461 t->prev_fc.last_ack_sent = ntohl (msg->ack);
3463 /* Message for us? */
3464 if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity)))
3466 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
3467 if (NULL == t->owner)
3469 GNUNET_break_op (0);
3472 if (NULL != peer_info->dhtget)
3474 GNUNET_DHT_get_stop (peer_info->dhtget);
3475 peer_info->dhtget = NULL;
3477 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
3478 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
3482 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3483 " not for us, retransmitting...\n");
3484 peer_info = peer_get (&msg->oid);
3485 send_prebuilt_message (message, t->prev_hop, t);
3491 * Core handler for notifications of broken paths
3493 * @param cls closure
3494 * @param message message
3495 * @param peer peer identity this notification is about
3497 * @return GNUNET_OK to keep the connection open,
3498 * GNUNET_SYSERR to close it (signal serious error)
3501 handle_mesh_path_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
3502 const struct GNUNET_MessageHeader *message)
3504 struct GNUNET_MESH_PathBroken *msg;
3505 struct MeshTunnel *t;
3507 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3508 "Received a PATH BROKEN msg from %s\n", GNUNET_i2s (peer));
3509 msg = (struct GNUNET_MESH_PathBroken *) message;
3510 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
3511 GNUNET_i2s (&msg->peer1));
3512 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
3513 GNUNET_i2s (&msg->peer2));
3514 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3517 GNUNET_break_op (0);
3520 tunnel_notify_connection_broken (t, GNUNET_PEER_search (&msg->peer1),
3521 GNUNET_PEER_search (&msg->peer2));
3528 * Core handler for tunnel destruction
3530 * @param cls closure
3531 * @param message message
3532 * @param peer peer identity this notification is about
3534 * @return GNUNET_OK to keep the connection open,
3535 * GNUNET_SYSERR to close it (signal serious error)
3538 handle_mesh_tunnel_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
3539 const struct GNUNET_MessageHeader *message)
3541 struct GNUNET_MESH_TunnelDestroy *msg;
3542 struct MeshTunnel *t;
3544 msg = (struct GNUNET_MESH_TunnelDestroy *) message;
3545 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3546 "Got a TUNNEL DESTROY packet from %s\n",
3548 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3549 " for tunnel %s [%u]\n",
3550 GNUNET_i2s (&msg->oid), ntohl (msg->tid));
3551 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3554 /* Probably already got the message from another path,
3555 * destroyed the tunnel and retransmitted to children.
3558 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel",
3562 if (t->local_tid_dest >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
3564 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "INCOMING TUNNEL %X %X\n",
3565 t->local_tid, t->local_tid_dest);
3567 if (GNUNET_PEER_search (peer) == t->prev_hop)
3569 // TODO check owner's signature
3570 // TODO add owner's signatue to tunnel for retransmission
3571 peer_cancel_queues (t->prev_hop, t);
3572 GNUNET_PEER_change_rc (t->prev_hop, -1);
3575 else if (GNUNET_PEER_search (peer) == t->next_hop)
3577 // TODO check dest's signature
3578 // TODO add dest's signatue to tunnel for retransmission
3579 peer_cancel_queues (t->next_hop, t);
3580 GNUNET_PEER_change_rc (t->next_hop, -1);
3585 GNUNET_break_op (0);
3586 // TODO check both owner AND destination's signature to see which matches
3587 // TODO restransmit in appropriate direction
3590 tunnel_destroy_empty (t);
3592 // TODO: add timeout to destroy the tunnel anyway
3598 * Core handler for mesh network traffic going from the origin to a peer
3600 * @param cls closure
3601 * @param peer peer identity this notification is about
3602 * @param message message
3603 * @return GNUNET_OK to keep the connection open,
3604 * GNUNET_SYSERR to close it (signal serious error)
3607 handle_mesh_unicast (void *cls, const struct GNUNET_PeerIdentity *peer,
3608 const struct GNUNET_MessageHeader *message)
3610 struct GNUNET_MESH_Data *msg;
3611 struct MeshTunnel *t;
3616 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a unicast packet from %s\n",
3619 size = ntohs (message->size);
3621 sizeof (struct GNUNET_MESH_Data) +
3622 sizeof (struct GNUNET_MessageHeader))
3627 msg = (struct GNUNET_MESH_Data *) message;
3628 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " of type %s\n",
3629 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
3631 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3634 /* TODO notify back: we don't know this tunnel */
3635 GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO);
3636 GNUNET_break_op (0);
3639 pid = ntohl (msg->pid);
3640 if (GMC_is_pid_bigger (pid, t->prev_fc.last_ack_sent))
3642 GNUNET_STATISTICS_update (stats, "# unsolicited unicast", 1, GNUNET_NO);
3643 GNUNET_break_op (0);
3644 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3645 "Received PID %u, ACK %u\n",
3646 pid, t->prev_fc.last_ack_sent);
3647 tunnel_send_fwd_ack(t, GNUNET_MESSAGE_TYPE_MESH_POLL);
3651 tunnel_reset_timeout (t);
3652 if (t->dest == myid)
3654 /* TODO signature verification */
3655 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3656 " it's for us! sending to clients...\n");
3657 GNUNET_STATISTICS_update (stats, "# unicast received", 1, GNUNET_NO);
3658 // if (GMC_is_pid_bigger(pid, t->prev_fc.last_pid_recv)) FIXME use
3659 if (pid == t->prev_fc.last_pid_recv + 1)
3661 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3662 " pid %u not seen yet, forwarding\n", pid);
3663 t->prev_fc.last_pid_recv = pid;
3664 tunnel_send_client_ucast (t, msg);
3665 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST);
3669 // GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO);
3670 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3671 " Pid %u not expected, sending FWD ACK!\n", pid);
3672 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_DATA_ACK);
3676 t->prev_fc.last_pid_recv = pid;
3677 if (0 == t->next_hop)
3682 ttl = ntohl (msg->ttl);
3683 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
3686 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
3687 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
3688 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
3691 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3692 " not for us, retransmitting...\n");
3694 send_prebuilt_message (message, t->next_hop, t);
3695 GNUNET_STATISTICS_update (stats, "# unicast forwarded", 1, GNUNET_NO);
3701 * Core handler for mesh network traffic toward the owner of a tunnel
3703 * @param cls closure
3704 * @param message message
3705 * @param peer peer identity this notification is about
3707 * @return GNUNET_OK to keep the connection open,
3708 * GNUNET_SYSERR to close it (signal serious error)
3711 handle_mesh_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
3712 const struct GNUNET_MessageHeader *message)
3714 struct GNUNET_MESH_Data *msg;
3715 struct MeshTunnel *t;
3720 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a ToOrigin packet from %s\n",
3722 size = ntohs (message->size);
3723 if (size < sizeof (struct GNUNET_MESH_Data) + /* Payload must be */
3724 sizeof (struct GNUNET_MessageHeader)) /* at least a header */
3726 GNUNET_break_op (0);
3729 msg = (struct GNUNET_MESH_Data *) message;
3730 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " of type %s\n",
3731 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
3732 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3733 pid = ntohl (msg->pid);
3736 /* TODO notify that we dont know this tunnel (whom)? */
3737 GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO);
3738 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3739 "Received to_origin with PID %u on unknown tunnel %s [%u]\n",
3740 pid, GNUNET_i2s (&msg->oid), ntohl (msg->tid));
3744 if (GMC_is_pid_bigger (pid, t->next_fc.last_ack_sent))
3746 GNUNET_STATISTICS_update (stats, "# unsolicited to_orig", 1, GNUNET_NO);
3747 GNUNET_break_op (0);
3748 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3749 "Received PID %u, ACK %u\n",
3750 pid, t->next_fc.last_ack_sent);
3751 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
3755 if (myid == t->id.oid)
3757 /* TODO signature verification */
3758 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3759 " it's for us! sending to clients...\n");
3760 GNUNET_STATISTICS_update (stats, "# to origin received", 1, GNUNET_NO);
3761 if (pid == t->next_fc.last_pid_recv + 1) // FIXME use "futures" as accepting
3763 t->next_fc.last_pid_recv = pid;
3764 tunnel_send_client_to_orig (t, msg);
3765 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
3769 // GNUNET_STATISTICS_update (stats, "# duplicate PID drops BCK", 1, GNUNET_NO);
3770 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3771 " Pid %u not expected, sending FWD ACK!\n", pid);
3772 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_DATA_ACK);
3776 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3777 " not for us, retransmitting...\n");
3778 t->next_fc.last_pid_recv = pid;
3779 if (0 == t->prev_hop) /* No owner AND no prev hop */
3781 if (GNUNET_YES == t->destroy)
3783 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3784 "to orig received on a dying tunnel %s [%X]\n",
3785 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3788 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3789 "unknown to origin at %s\n",
3790 GNUNET_i2s (&my_full_id));
3791 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3794 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3795 "on tunnel %s [%X]\n",
3796 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3799 ttl = ntohl (msg->ttl);
3800 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
3803 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
3804 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
3805 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
3808 send_prebuilt_message (message, t->prev_hop, t);
3809 GNUNET_STATISTICS_update (stats, "# to origin forwarded", 1, GNUNET_NO);
3816 * Core handler for mesh network traffic end-to-end ACKs.
3818 * @param cls Closure.
3819 * @param message Message.
3820 * @param peer Peer identity this notification is about.
3822 * @return GNUNET_OK to keep the connection open,
3823 * GNUNET_SYSERR to close it (signal serious error)
3826 handle_mesh_data_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
3827 const struct GNUNET_MessageHeader *message)
3829 struct GNUNET_MESH_DataACK *msg;
3830 struct GNUNET_CONTAINER_MultiHashMap32 *hm;
3831 struct MeshSentMessage *copy;
3832 struct MeshTunnel *t;
3836 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a DATA ACK message from %s!\n",
3838 msg = (struct GNUNET_MESH_DataACK *) message;
3840 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3843 /* TODO notify that we dont know this tunnel (whom)? */
3844 GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO);
3847 ack = ntohl (msg->pid);
3848 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
3850 /* Is this a forward or backward ACK? */
3851 id = GNUNET_PEER_search (peer);
3852 if (t->next_hop == id)
3854 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
3855 if (NULL == t->owner)
3857 send_prebuilt_message (message, t->prev_hop, t);
3860 hm = t->sent_messages_fwd;
3861 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_DATA_ACK);
3863 else if (t->prev_hop == id)
3865 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
3866 if (NULL == t->client)
3868 send_prebuilt_message (message, t->next_hop, t);
3871 hm = t->sent_messages_bck;
3872 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_DATA_ACK);
3875 GNUNET_break_op (0);
3877 copy = GNUNET_CONTAINER_multihashmap32_get (hm, ack);
3880 GNUNET_break (0); // FIXME needed?
3883 GNUNET_break (GNUNET_YES ==
3884 GNUNET_CONTAINER_multihashmap32_remove (hm, ack, copy));
3885 if (GNUNET_SCHEDULER_NO_TASK != copy->retry_task)
3887 GNUNET_SCHEDULER_cancel (copy->retry_task);
3896 * Core handler for mesh network traffic point-to-point acks.
3898 * @param cls closure
3899 * @param message message
3900 * @param peer peer identity this notification is about
3902 * @return GNUNET_OK to keep the connection open,
3903 * GNUNET_SYSERR to close it (signal serious error)
3906 handle_mesh_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
3907 const struct GNUNET_MessageHeader *message)
3909 struct GNUNET_MESH_ACK *msg;
3910 struct MeshTunnel *t;
3914 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
3916 msg = (struct GNUNET_MESH_ACK *) message;
3918 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3922 /* TODO notify that we dont know this tunnel (whom)? */
3923 GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO);
3926 ack = ntohl (msg->pid);
3927 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
3929 /* Is this a forward or backward ACK? */
3930 id = GNUNET_PEER_search (peer);
3931 if (t->next_hop == id)
3934 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
3935 if (GNUNET_SCHEDULER_NO_TASK != t->next_fc.poll_task &&
3936 GMC_is_pid_bigger (ack, t->next_fc.last_ack_recv))
3938 GNUNET_SCHEDULER_cancel (t->next_fc.poll_task);
3939 t->next_fc.poll_task = GNUNET_SCHEDULER_NO_TASK;
3940 t->next_fc.poll_time = GNUNET_TIME_UNIT_SECONDS;
3942 t->next_fc.last_ack_recv = ack;
3943 peer_unlock_queue (t->next_hop);
3944 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
3946 else if (t->prev_hop == id)
3949 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
3950 if (GNUNET_SCHEDULER_NO_TASK != t->prev_fc.poll_task &&
3951 GMC_is_pid_bigger (ack, t->prev_fc.last_ack_recv))
3953 GNUNET_SCHEDULER_cancel (t->prev_fc.poll_task);
3954 t->prev_fc.poll_task = GNUNET_SCHEDULER_NO_TASK;
3955 t->prev_fc.poll_time = GNUNET_TIME_UNIT_SECONDS;
3957 t->prev_fc.last_ack_recv = ack;
3958 peer_unlock_queue (t->prev_hop);
3959 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
3962 GNUNET_break_op (0);
3968 * Core handler for mesh network traffic point-to-point ack polls.
3970 * @param cls closure
3971 * @param message message
3972 * @param peer peer identity this notification is about
3974 * @return GNUNET_OK to keep the connection open,
3975 * GNUNET_SYSERR to close it (signal serious error)
3978 handle_mesh_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
3979 const struct GNUNET_MessageHeader *message)
3981 struct GNUNET_MESH_Poll *msg;
3982 struct MeshTunnel *t;
3985 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an POLL packet from %s!\n",
3988 msg = (struct GNUNET_MESH_Poll *) message;
3990 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3994 /* TODO notify that we dont know this tunnel (whom)? */
3995 GNUNET_STATISTICS_update (stats, "# poll on unknown tunnel", 1, GNUNET_NO);
3996 GNUNET_break_op (0);
4000 /* Is this a forward or backward ACK? */
4001 id = GNUNET_PEER_search(peer);
4002 if (t->next_hop == id)
4004 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from FWD\n");
4005 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
4007 else if (t->prev_hop == id)
4009 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from BCK\n");
4010 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
4020 * Core handler for mesh keepalives.
4022 * @param cls closure
4023 * @param message message
4024 * @param peer peer identity this notification is about
4025 * @return GNUNET_OK to keep the connection open,
4026 * GNUNET_SYSERR to close it (signal serious error)
4028 * TODO: Check who we got this from, to validate route.
4031 handle_mesh_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
4032 const struct GNUNET_MessageHeader *message)
4034 struct GNUNET_MESH_TunnelKeepAlive *msg;
4035 struct MeshTunnel *t;
4037 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
4040 msg = (struct GNUNET_MESH_TunnelKeepAlive *) message;
4041 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4045 /* TODO notify that we dont know that tunnel */
4046 GNUNET_STATISTICS_update (stats, "# keepalive on unknown tunnel", 1,
4051 tunnel_reset_timeout (t);
4052 if (NULL != t->client || 0 == t->next_hop || myid == t->next_hop)
4055 GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
4056 send_prebuilt_message (message, t->next_hop, t);
4063 * Functions to handle messages from core
4065 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
4066 {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0},
4067 {&handle_mesh_path_broken, GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN,
4068 sizeof (struct GNUNET_MESH_PathBroken)},
4069 {&handle_mesh_tunnel_destroy, GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY,
4070 sizeof (struct GNUNET_MESH_TunnelDestroy)},
4071 {&handle_mesh_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
4072 {&handle_mesh_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
4073 {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_DATA_ACK,
4074 sizeof (struct GNUNET_MESH_DataACK)},
4075 {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE,
4076 sizeof (struct GNUNET_MESH_TunnelKeepAlive)},
4077 {&handle_mesh_ack, GNUNET_MESSAGE_TYPE_MESH_ACK,
4078 sizeof (struct GNUNET_MESH_ACK)},
4079 {&handle_mesh_poll, GNUNET_MESSAGE_TYPE_MESH_POLL,
4080 sizeof (struct GNUNET_MESH_Poll)},
4081 {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
4082 sizeof (struct GNUNET_MESH_PathACK)},
4088 /******************************************************************************/
4089 /**************** MESH LOCAL HANDLER HELPERS ***********************/
4090 /******************************************************************************/
4095 * notify_client_connection_failure: notify a client that the connection to the
4096 * requested remote peer is not possible (for instance, no route found)
4097 * Function called when the socket is ready to queue more data. "buf" will be
4098 * NULL and "size" zero if the socket was closed for writing in the meantime.
4100 * @param cls closure
4101 * @param size number of bytes available in buf
4102 * @param buf where the callee should write the message
4103 * @return number of bytes written to buf
4106 notify_client_connection_failure (void *cls, size_t size, void *buf)
4109 struct MeshPeerInfo *peer_info;
4110 struct GNUNET_MESH_PeerControl *msg;
4111 struct GNUNET_PeerIdentity id;
4113 if (0 == size && NULL == buf)
4115 // TODO retry? cancel?
4119 size_needed = sizeof (struct GNUNET_MESH_PeerControl);
4120 peer_info = (struct MeshPeerInfo *) cls;
4121 msg = (struct GNUNET_MESH_PeerControl *) buf;
4122 msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
4123 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED);
4124 // msg->tunnel_id = htonl(peer_info->t->tid);
4125 GNUNET_PEER_resolve (peer_info->id, &id);
4126 memcpy (&msg->peer, &id, sizeof (struct GNUNET_PeerIdentity));
4134 * Send keepalive packets for a tunnel.
4136 * @param cls Closure (tunnel for which to send the keepalive).
4137 * @param tc Notification context.
4139 * FIXME: add a refresh reset in case of normal unicast traffic is doing the job
4142 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4144 struct MeshTunnel *t = cls;
4145 struct GNUNET_MESH_TunnelKeepAlive *msg;
4146 size_t size = sizeof (struct GNUNET_MESH_TunnelKeepAlive);
4149 t->maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4150 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) ||
4151 NULL == t->owner || 0 == t->local_tid)
4156 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4157 "sending keepalive for tunnel %d\n", t->id.tid);
4159 msg = (struct GNUNET_MESH_TunnelKeepAlive *) cbuf;
4160 msg->header.size = htons (size);
4161 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE);
4162 msg->oid = my_full_id;
4163 msg->tid = htonl (t->id.tid);
4164 send_prebuilt_message (&msg->header, t->next_hop, t);
4166 t->maintenance_task =
4167 GNUNET_SCHEDULER_add_delayed (refresh_path_time, &path_refresh, t);
4172 * Function to process paths received for a new peer addition. The recorded
4173 * paths form the initial tunnel, which can be optimized later.
4174 * Called on each result obtained for the DHT search.
4176 * @param cls closure
4177 * @param exp when will this value expire
4178 * @param key key of the result
4179 * @param get_path path of the get request
4180 * @param get_path_length lenght of get_path
4181 * @param put_path path of the put request
4182 * @param put_path_length length of the put_path
4183 * @param type type of the result
4184 * @param size number of bytes in data
4185 * @param data pointer to the result data
4188 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
4189 const struct GNUNET_HashCode * key,
4190 const struct GNUNET_PeerIdentity *get_path,
4191 unsigned int get_path_length,
4192 const struct GNUNET_PeerIdentity *put_path,
4193 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
4194 size_t size, const void *data)
4196 struct MeshPeerInfo *peer = cls;
4197 struct MeshPeerPath *p;
4198 struct GNUNET_PeerIdentity pi;
4201 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got results from DHT!\n");
4202 GNUNET_PEER_resolve (peer->id, &pi);
4203 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&pi));
4205 p = path_build_from_dht (get_path, get_path_length,
4206 put_path, put_path_length);
4207 path_add_to_peers (p, GNUNET_NO);
4209 for (i = 0; i < peer->ntunnels; i++)
4211 struct GNUNET_PeerIdentity id;
4213 GNUNET_PEER_resolve (peer->tunnels[i]->id.oid, &id);
4214 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... tunnel %s:%X (%X / %X)\n",
4215 GNUNET_i2s (&id), peer->tunnels[i]->id.tid,
4216 peer->tunnels[i]->local_tid,
4217 peer->tunnels[i]->local_tid_dest);
4218 if (peer->tunnels[i]->state == MESH_TUNNEL_SEARCHING)
4220 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
4221 peer_connect (peer, peer->tunnels[i]);
4229 /******************************************************************************/
4230 /********************* MESH LOCAL HANDLES **************************/
4231 /******************************************************************************/
4235 * Handler for client disconnection
4237 * @param cls closure
4238 * @param client identification of the client; NULL
4239 * for the last call when the server is destroyed
4242 handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
4244 struct MeshClient *c;
4245 struct MeshClient *next;
4247 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected: %p\n", client);
4250 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (SERVER DOWN)\n");
4257 if (c->handle != client)
4259 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4260 " ... searching %p (%u)\n",
4265 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "matching client found (%u)\n",
4267 GNUNET_SERVER_client_drop (c->handle);
4268 c->shutting_down = GNUNET_YES;
4269 GNUNET_CONTAINER_multihashmap_iterate (c->own_tunnels,
4270 &tunnel_destroy_iterator, c);
4271 GNUNET_CONTAINER_multihashmap_iterate (c->incoming_tunnels,
4272 &tunnel_destroy_iterator, c);
4273 GNUNET_CONTAINER_multihashmap_destroy (c->own_tunnels);
4274 GNUNET_CONTAINER_multihashmap_destroy (c->incoming_tunnels);
4276 if (NULL != c->ports)
4277 GNUNET_CONTAINER_multihashmap_destroy (c->ports);
4279 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, c);
4280 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " CLIENT FREE at %p\n", c);
4282 GNUNET_STATISTICS_update (stats, "# clients", -1, GNUNET_NO);
4285 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "done!\n");
4291 * Handler for new clients
4293 * @param cls closure
4294 * @param client identification of the client
4295 * @param message the actual message, which includes messages the client wants
4298 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
4299 const struct GNUNET_MessageHeader *message)
4301 struct GNUNET_MESH_ClientConnect *cc_msg;
4302 struct MeshClient *c;
4307 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client connected %p\n", client);
4309 /* Check data sanity */
4310 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
4311 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
4312 if (0 != (size % sizeof (uint32_t)))
4315 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4318 size /= sizeof (uint32_t);
4320 /* Create new client structure */
4321 c = GNUNET_malloc (sizeof (struct MeshClient));
4322 c->id = next_client_id++; /* overflow not important: just for debug */
4323 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client id %u\n", c->id);
4324 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client has %u ports\n", size);
4326 GNUNET_SERVER_client_keep (client);
4330 struct GNUNET_HashCode hc;
4332 p = (uint32_t *) &cc_msg[1];
4333 c->ports = GNUNET_CONTAINER_multihashmap_create (size, GNUNET_NO);
4334 for (i = 0; i < size; i++)
4337 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port: %u\n", u32);
4338 GMC_hash32 (u32, &hc);
4340 /* store in client's hashmap */
4341 GNUNET_CONTAINER_multihashmap_put (c->ports, &hc, c,
4342 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
4343 /* store in global hashmap */
4344 /* FIXME only allow one client to have the port open,
4345 * have a backup hashmap with waiting clients */
4346 GNUNET_CONTAINER_multihashmap_put (ports, &hc, c,
4347 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
4351 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, c);
4352 c->own_tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
4353 c->incoming_tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
4354 GNUNET_SERVER_notification_context_add (nc, client);
4355 GNUNET_STATISTICS_update (stats, "# clients", 1, GNUNET_NO);
4357 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4358 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client processed\n");
4363 * Handler for requests of new tunnels
4365 * @param cls Closure.
4366 * @param client Identification of the client.
4367 * @param message The actual message.
4370 handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client,
4371 const struct GNUNET_MessageHeader *message)
4373 struct GNUNET_MESH_TunnelMessage *t_msg;
4374 struct MeshPeerInfo *peer_info;
4375 struct MeshTunnel *t;
4376 struct MeshClient *c;
4377 MESH_TunnelNumber tid;
4379 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new tunnel requested\n");
4381 /* Sanity check for client registration */
4382 if (NULL == (c = client_get (client)))
4385 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4388 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4390 /* Message size sanity check */
4391 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
4394 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4398 t_msg = (struct GNUNET_MESH_TunnelMessage *) message;
4399 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n",
4400 GNUNET_i2s (&t_msg->peer));
4401 /* Sanity check for tunnel numbering */
4402 tid = ntohl (t_msg->tunnel_id);
4403 if (0 == (tid & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI))
4406 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4409 /* Sanity check for duplicate tunnel IDs */
4410 if (NULL != tunnel_get_by_local_id (c, tid))
4413 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4418 while (NULL != tunnel_get_by_pi (myid, next_tid))
4419 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
4420 t = tunnel_new (myid, next_tid, c, tid);
4421 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
4425 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4428 t->port = ntohl (t_msg->port);
4429 tunnel_set_options (t, ntohl (t_msg->options));
4430 if (GNUNET_YES == t->reliable)
4431 t->sent_messages_fwd =
4432 GNUNET_CONTAINER_multihashmap32_create (t->queue_max);
4433 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATED TUNNEL %s[%x]:%u (%x)\n",
4434 GNUNET_i2s (&my_full_id), t->id.tid, t->port, t->local_tid);
4436 peer_info = peer_get (&t_msg->peer);
4437 peer_info_add_tunnel (peer_info, t);
4438 peer_connect (peer_info, t);
4439 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4445 * Handler for requests of deleting tunnels
4447 * @param cls closure
4448 * @param client identification of the client
4449 * @param message the actual message
4452 handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
4453 const struct GNUNET_MessageHeader *message)
4455 struct GNUNET_MESH_TunnelMessage *tunnel_msg;
4456 struct MeshClient *c;
4457 struct MeshTunnel *t;
4458 MESH_TunnelNumber tid;
4460 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4461 "Got a DESTROY TUNNEL from client!\n");
4463 /* Sanity check for client registration */
4464 if (NULL == (c = client_get (client)))
4467 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4470 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4472 /* Message sanity check */
4473 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
4476 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4480 tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message;
4482 /* Retrieve tunnel */
4483 tid = ntohl (tunnel_msg->tunnel_id);
4484 t = tunnel_get_by_local_id(c, tid);
4487 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " tunnel %X not found\n", tid);
4489 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4493 /* Cleanup after the tunnel */
4494 client_delete_tunnel (c, t);
4499 else if (c == t->owner)
4501 peer_info_remove_tunnel (peer_get_short (t->dest), t);
4505 /* The tunnel will be destroyed when the last message is transmitted. */
4506 tunnel_destroy_empty (t);
4508 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4514 * Handler for client traffic directed to one peer
4516 * @param cls closure
4517 * @param client identification of the client
4518 * @param message the actual message
4521 handle_local_unicast (void *cls, struct GNUNET_SERVER_Client *client,
4522 const struct GNUNET_MessageHeader *message)
4524 struct MeshClient *c;
4525 struct MeshTunnel *t;
4526 struct GNUNET_MESH_Data *data_msg;
4527 MESH_TunnelNumber tid;
4530 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4531 "Got a unicast request from a client!\n");
4533 /* Sanity check for client registration */
4534 if (NULL == (c = client_get (client)))
4537 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4540 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4542 data_msg = (struct GNUNET_MESH_Data *) message;
4544 /* Sanity check for message size */
4545 size = ntohs (message->size);
4546 if (sizeof (struct GNUNET_MESH_Data) +
4547 sizeof (struct GNUNET_MessageHeader) > size)
4550 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4554 /* Tunnel exists? */
4555 tid = ntohl (data_msg->tid);
4556 t = tunnel_get_by_local_id (c, tid);
4560 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4564 /* Is it a local tunnel? Then, does client own the tunnel? */
4565 if (t->owner->handle != client)
4568 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4572 /* PID should be as expected: client<->service communication */
4573 if (ntohl (data_msg->pid) != t->prev_fc.last_pid_recv + 1)
4576 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4577 "Unicast PID, expected %u, got %u\n",
4578 t->prev_fc.last_pid_recv + 1, ntohl (data_msg->pid));
4579 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4583 /* Ok, everything is correct, send the message
4584 * (pretend we got it from a mesh peer)
4587 struct MeshSentMessage *copy;
4588 struct GNUNET_MESH_Data *payload;
4590 copy = GNUNET_malloc (sizeof (struct MeshSentMessage) + size);
4591 copy->id = ntohl (data_msg->pid);
4592 copy->is_forward = GNUNET_YES;
4593 copy->retry_timer = GNUNET_TIME_UNIT_MINUTES;
4594 copy->retry_task = GNUNET_SCHEDULER_add_delayed (copy->retry_timer,
4595 &tunnel_retransmit_message,
4597 if (GNUNET_YES == t->reliable &&
4599 GNUNET_CONTAINER_multihashmap32_put (t->sent_messages_fwd,
4602 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
4605 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4608 payload = (struct GNUNET_MESH_Data *) ©[1];
4609 memcpy (payload, data_msg, size);
4610 payload->oid = my_full_id;
4611 payload->tid = htonl (t->id.tid);
4612 payload->ttl = htonl (default_ttl);
4613 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4614 " calling generic handler...\n");
4615 handle_mesh_unicast (NULL, &my_full_id, &payload->header);
4617 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "receive done OK\n");
4618 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4625 * Handler for client traffic directed to the origin
4627 * @param cls closure
4628 * @param client identification of the client
4629 * @param message the actual message
4632 handle_local_to_origin (void *cls, struct GNUNET_SERVER_Client *client,
4633 const struct GNUNET_MessageHeader *message)
4635 struct GNUNET_MESH_Data *data_msg;
4636 struct MeshFlowControl *fc;
4637 struct MeshClient *c;
4638 struct MeshTunnel *t;
4639 MESH_TunnelNumber tid;
4642 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4643 "Got a ToOrigin request from a client!\n");
4644 /* Sanity check for client registration */
4645 if (NULL == (c = client_get (client)))
4648 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4651 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4653 data_msg = (struct GNUNET_MESH_Data *) message;
4655 /* Sanity check for message size */
4656 size = ntohs (message->size);
4657 if (sizeof (struct GNUNET_MESH_Data) +
4658 sizeof (struct GNUNET_MessageHeader) > size)
4661 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4665 /* Tunnel exists? */
4666 tid = ntohl (data_msg->tid);
4667 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", tid);
4668 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
4671 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4674 t = tunnel_get_by_local_id (c, tid);
4677 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Tunnel %X unknown.\n", tid);
4678 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id);
4680 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4684 /* It should be sent by someone who has this as incoming tunnel. */
4688 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4692 /* PID should be as expected */
4694 if (ntohl (data_msg->pid) != fc->last_pid_recv + 1)
4697 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4698 "To Origin PID, expected %u, got %u\n",
4699 fc->last_pid_recv + 1,
4700 ntohl (data_msg->pid));
4701 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4705 /* Ok, everything is correct, send the message
4706 * (pretend we got it from a mesh peer)
4709 struct MeshSentMessage *copy;
4710 struct GNUNET_MESH_Data *payload;
4712 copy = GNUNET_malloc (sizeof (struct MeshSentMessage) + size);
4713 copy->id = ntohl (data_msg->pid);
4714 copy->is_forward = GNUNET_NO;
4715 copy->retry_timer = GNUNET_TIME_UNIT_MINUTES;
4716 copy->retry_task = GNUNET_SCHEDULER_add_delayed (copy->retry_timer,
4717 &tunnel_retransmit_message,
4719 if (GNUNET_YES == t->reliable &&
4721 GNUNET_CONTAINER_multihashmap32_put (t->sent_messages_bck,
4724 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
4727 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4730 payload = (struct GNUNET_MESH_Data *) ©[1];
4731 memcpy (payload, data_msg, size);
4732 GNUNET_PEER_resolve (t->id.oid, &payload->oid);
4733 payload->tid = htonl (t->id.tid);
4734 payload->ttl = htonl (default_ttl);
4736 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4737 " calling generic handler...\n");
4738 handle_mesh_to_orig (NULL, &my_full_id, &payload->header);
4740 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4747 * Handler for client's ACKs for payload traffic.
4749 * @param cls Closure (unused).
4750 * @param client Identification of the client.
4751 * @param message The actual message.
4754 handle_local_ack (void *cls, struct GNUNET_SERVER_Client *client,
4755 const struct GNUNET_MessageHeader *message)
4757 struct GNUNET_MESH_LocalAck *msg;
4758 struct MeshTunnel *t;
4759 struct MeshClient *c;
4760 MESH_TunnelNumber tid;
4763 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a local ACK\n");
4764 /* Sanity check for client registration */
4765 if (NULL == (c = client_get (client)))
4768 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4771 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4773 msg = (struct GNUNET_MESH_LocalAck *) message;
4775 /* Tunnel exists? */
4776 tid = ntohl (msg->tunnel_id);
4777 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", tid);
4778 t = tunnel_get_by_local_id (c, tid);
4782 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Tunnel %X unknown.\n", tid);
4783 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id);
4784 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4788 ack = ntohl (msg->ack);
4789 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", ack);
4791 /* Does client own tunnel? I.E: Is this an ACK for BCK traffic? */
4794 /* The client owns the tunnel, ACK is for data to_origin, send BCK ACK. */
4795 t->prev_fc.last_ack_recv = ack;
4796 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
4800 /* The client doesn't own the tunnel, this ACK is for FWD traffic. */
4801 t->next_fc.last_ack_recv = ack;
4802 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
4805 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4813 * Iterator over all tunnels to send a monitoring client info about each tunnel.
4815 * @param cls Closure (client handle).
4816 * @param key Key (hashed tunnel ID, unused).
4817 * @param value Tunnel info.
4819 * @return GNUNET_YES, to keep iterating.
4822 monitor_all_tunnels_iterator (void *cls,
4823 const struct GNUNET_HashCode * key,
4826 struct GNUNET_SERVER_Client *client = cls;
4827 struct MeshTunnel *t = value;
4828 struct GNUNET_MESH_LocalMonitor *msg;
4830 msg = GNUNET_malloc (sizeof(struct GNUNET_MESH_LocalMonitor));
4831 GNUNET_PEER_resolve(t->id.oid, &msg->owner);
4832 msg->tunnel_id = htonl (t->id.tid);
4833 msg->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
4834 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS);
4835 GNUNET_PEER_resolve (t->dest, &msg->destination);
4837 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4838 "* sending info about tunnel %s [%u]\n",
4839 GNUNET_i2s (&msg->owner), t->id.tid);
4841 GNUNET_SERVER_notification_context_unicast (nc, client,
4842 &msg->header, GNUNET_NO);
4848 * Handler for client's MONITOR request.
4850 * @param cls Closure (unused).
4851 * @param client Identification of the client.
4852 * @param message The actual message.
4855 handle_local_get_tunnels (void *cls, struct GNUNET_SERVER_Client *client,
4856 const struct GNUNET_MessageHeader *message)
4858 struct MeshClient *c;
4860 /* Sanity check for client registration */
4861 if (NULL == (c = client_get (client)))
4864 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4868 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4869 "Received get tunnels request from client %u\n",
4871 GNUNET_CONTAINER_multihashmap_iterate (tunnels,
4872 monitor_all_tunnels_iterator,
4874 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4875 "Get tunnels request from client %u completed\n",
4877 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4882 * Handler for client's MONITOR_TUNNEL request.
4884 * @param cls Closure (unused).
4885 * @param client Identification of the client.
4886 * @param message The actual message.
4889 handle_local_show_tunnel (void *cls, struct GNUNET_SERVER_Client *client,
4890 const struct GNUNET_MessageHeader *message)
4892 const struct GNUNET_MESH_LocalMonitor *msg;
4893 struct GNUNET_MESH_LocalMonitor *resp;
4894 struct MeshClient *c;
4895 struct MeshTunnel *t;
4897 /* Sanity check for client registration */
4898 if (NULL == (c = client_get (client)))
4901 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4905 msg = (struct GNUNET_MESH_LocalMonitor *) message;
4906 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4907 "Received tunnel info request from client %u for tunnel %s[%X]\n",
4910 ntohl (msg->tunnel_id));
4911 t = tunnel_get (&msg->owner, ntohl (msg->tunnel_id));
4914 /* We don't know the tunnel FIXME */
4915 struct GNUNET_MESH_LocalMonitor warn;
4918 GNUNET_SERVER_notification_context_unicast (nc, client,
4921 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4925 /* Initialize context */
4926 resp = GNUNET_malloc (sizeof (struct GNUNET_MESH_LocalMonitor));
4928 GNUNET_PEER_resolve (t->dest, &resp->destination);
4929 resp->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
4930 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
4931 &resp->header, GNUNET_NO);
4934 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4935 "Monitor tunnel request from client %u completed\n",
4937 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4942 * Functions to handle messages from clients
4944 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
4945 {&handle_local_new_client, NULL,
4946 GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
4947 {&handle_local_tunnel_create, NULL,
4948 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE,
4949 sizeof (struct GNUNET_MESH_TunnelMessage)},
4950 {&handle_local_tunnel_destroy, NULL,
4951 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY,
4952 sizeof (struct GNUNET_MESH_TunnelMessage)},
4953 {&handle_local_unicast, NULL,
4954 GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
4955 {&handle_local_to_origin, NULL,
4956 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
4957 {&handle_local_ack, NULL,
4958 GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK,
4959 sizeof (struct GNUNET_MESH_LocalAck)},
4960 {&handle_local_get_tunnels, NULL,
4961 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS,
4962 sizeof (struct GNUNET_MessageHeader)},
4963 {&handle_local_show_tunnel, NULL,
4964 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL,
4965 sizeof (struct GNUNET_MESH_LocalMonitor)},
4971 * Method called whenever a given peer connects.
4973 * @param cls closure
4974 * @param peer peer identity this notification is about
4977 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
4979 struct MeshPeerInfo *peer_info;
4980 struct MeshPeerPath *path;
4982 DEBUG_CONN ("Peer connected\n");
4983 DEBUG_CONN (" %s\n", GNUNET_i2s (&my_full_id));
4984 peer_info = peer_get (peer);
4985 if (myid == peer_info->id)
4987 DEBUG_CONN (" (self)\n");
4988 path = path_new (1);
4992 DEBUG_CONN (" %s\n", GNUNET_i2s (peer));
4993 path = path_new (2);
4994 path->peers[1] = peer_info->id;
4995 GNUNET_PEER_change_rc (peer_info->id, 1);
4996 GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO);
4998 path->peers[0] = myid;
4999 GNUNET_PEER_change_rc (myid, 1);
5000 peer_info_add_path (peer_info, path, GNUNET_YES);
5006 * Method called whenever a peer disconnects.
5008 * @param cls closure
5009 * @param peer peer identity this notification is about
5012 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
5014 struct MeshPeerInfo *pi;
5015 struct MeshPeerQueue *q;
5016 struct MeshPeerQueue *n;
5018 DEBUG_CONN ("Peer disconnected\n");
5019 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
5029 /* TODO try to reroute this traffic instead */
5030 queue_destroy(q, GNUNET_YES);
5033 if (NULL != pi->core_transmit)
5035 GNUNET_CORE_notify_transmit_ready_cancel(pi->core_transmit);
5036 pi->core_transmit = NULL;
5038 peer_remove_path (pi, pi->id, myid);
5041 DEBUG_CONN (" (self)\n");
5043 GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO);
5049 * Install server (service) handlers and start listening to clients.
5054 GNUNET_SERVER_add_handlers (server_handle, client_handlers);
5055 GNUNET_SERVER_disconnect_notify (server_handle,
5056 &handle_local_client_disconnect, NULL);
5057 nc = GNUNET_SERVER_notification_context_create (server_handle, 1);
5059 clients_head = NULL;
5060 clients_tail = NULL;
5062 GNUNET_SERVER_resume (server_handle);
5067 * To be called on core init/fail.
5069 * @param cls Closure (config)
5070 * @param server handle to the server for this service
5071 * @param identity the public identity of this peer
5074 core_init (void *cls, struct GNUNET_CORE_Handle *server,
5075 const struct GNUNET_PeerIdentity *identity)
5077 const struct GNUNET_CONFIGURATION_Handle *c = cls;
5080 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
5081 GNUNET_break (core_handle == server);
5082 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)) ||
5085 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
5086 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5088 GNUNET_i2s (identity));
5089 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5091 GNUNET_i2s (&my_full_id));
5092 GNUNET_CORE_disconnect (core_handle);
5093 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
5094 NULL, /* Closure passed to MESH functions */
5095 &core_init, /* Call core_init once connected */
5096 &core_connect, /* Handle connects */
5097 &core_disconnect, /* remove peers on disconnects */
5098 NULL, /* Don't notify about all incoming messages */
5099 GNUNET_NO, /* For header only in notification */
5100 NULL, /* Don't notify about all outbound messages */
5101 GNUNET_NO, /* For header-only out notification */
5102 core_handlers); /* Register these handlers */
5111 /******************************************************************************/
5112 /************************ MAIN FUNCTIONS ****************************/
5113 /******************************************************************************/
5116 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
5118 * @param cls closure
5119 * @param key current key code
5120 * @param value value in the hash map
5121 * @return GNUNET_YES if we should continue to iterate,
5125 shutdown_tunnel (void *cls, const struct GNUNET_HashCode * key, void *value)
5127 struct MeshTunnel *t = value;
5134 * Iterator over peer hash map entries to destroy the tunnel during shutdown.
5136 * @param cls closure
5137 * @param key current key code
5138 * @param value value in the hash map
5139 * @return GNUNET_YES if we should continue to iterate,
5143 shutdown_peer (void *cls, const struct GNUNET_HashCode * key, void *value)
5145 struct MeshPeerInfo *p = value;
5146 struct MeshPeerQueue *q;
5147 struct MeshPeerQueue *n;
5155 queue_destroy(q, GNUNET_YES);
5159 peer_info_destroy (p);
5165 * Task run during shutdown.
5171 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
5173 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n");
5175 if (core_handle != NULL)
5177 GNUNET_CORE_disconnect (core_handle);
5182 GNUNET_CRYPTO_ecc_key_create_stop (keygen);
5185 GNUNET_CONTAINER_multihashmap_iterate (tunnels, &shutdown_tunnel, NULL);
5186 GNUNET_CONTAINER_multihashmap_iterate (peers, &shutdown_peer, NULL);
5187 if (dht_handle != NULL)
5189 GNUNET_DHT_disconnect (dht_handle);
5194 GNUNET_SERVER_notification_context_destroy (nc);
5197 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
5199 GNUNET_SCHEDULER_cancel (announce_id_task);
5200 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
5202 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shut down\n");
5207 * Callback for hostkey read/generation.
5209 * @param cls Closure (Configuration handle).
5210 * @param pk The ECC private key.
5211 * @param emsg Error message, if any.
5214 key_generation_cb (void *cls,
5215 struct GNUNET_CRYPTO_EccPrivateKey *pk,
5218 const struct GNUNET_CONFIGURATION_Handle *c = cls;
5223 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5224 _("Could not access hostkey: %s. Exiting.\n"),
5226 GNUNET_SCHEDULER_shutdown ();
5229 my_private_key = pk;
5230 GNUNET_CRYPTO_ecc_key_get_public (my_private_key, &my_public_key);
5231 GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
5232 &my_full_id.hashPubKey);
5233 myid = GNUNET_PEER_intern (&my_full_id);
5234 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5235 "Mesh for peer [%s] starting\n",
5236 GNUNET_i2s(&my_full_id));
5238 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
5239 NULL, /* Closure passed to MESH functions */
5240 &core_init, /* Call core_init once connected */
5241 &core_connect, /* Handle connects */
5242 &core_disconnect, /* remove peers on disconnects */
5243 NULL, /* Don't notify about all incoming messages */
5244 GNUNET_NO, /* For header only in notification */
5245 NULL, /* Don't notify about all outbound messages */
5246 GNUNET_NO, /* For header-only out notification */
5247 core_handlers); /* Register these handlers */
5248 if (core_handle == NULL)
5251 GNUNET_SCHEDULER_shutdown ();
5256 next_local_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
5258 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
5260 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mesh service running\n");
5265 * Process mesh requests.
5267 * @param cls closure
5268 * @param server the initialized server
5269 * @param c configuration to use
5272 run (void *cls, struct GNUNET_SERVER_Handle *server,
5273 const struct GNUNET_CONFIGURATION_Handle *c)
5277 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n");
5278 server_handle = server;
5279 GNUNET_SERVER_suspend (server_handle);
5282 GNUNET_CONFIGURATION_get_value_filename (c, "PEER", "PRIVATE_KEY",
5285 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5287 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5288 "mesh", "peer/privatekey");
5289 GNUNET_SCHEDULER_shutdown ();
5294 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_PATH_TIME",
5295 &refresh_path_time))
5297 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5299 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5300 "mesh", "refresh path time");
5301 GNUNET_SCHEDULER_shutdown ();
5306 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "ID_ANNOUNCE_TIME",
5309 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5311 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5312 "mesh", "id announce time");
5313 GNUNET_SCHEDULER_shutdown ();
5318 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "CONNECT_TIMEOUT",
5321 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5323 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5324 "mesh", "connect timeout");
5325 GNUNET_SCHEDULER_shutdown ();
5330 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
5333 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5335 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5336 "mesh", "max msgs queue");
5337 GNUNET_SCHEDULER_shutdown ();
5342 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_TUNNELS",
5345 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5347 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5348 "mesh", "max tunnels");
5349 GNUNET_SCHEDULER_shutdown ();
5354 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
5357 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5359 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5360 "mesh", "default ttl", 64);
5365 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_PEERS",
5368 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5369 _("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5370 "mesh", "max peers", 1000);
5375 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DROP_PERCENT",
5382 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5383 "Mesh is running with drop mode enabled. "
5384 "This is NOT a good idea! "
5385 "Remove the DROP_PERCENT option from your configuration.\n");
5389 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DHT_REPLICATION_LEVEL",
5390 &dht_replication_level))
5392 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5394 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5395 "mesh", "dht replication level", 3);
5396 dht_replication_level = 3;
5399 tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
5400 incoming_tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
5401 peers = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
5402 ports = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
5404 dht_handle = GNUNET_DHT_connect (c, 64);
5405 if (NULL == dht_handle)
5409 stats = GNUNET_STATISTICS_create ("mesh", c);
5411 /* Scheduled the task to clean up when shutdown is called */
5412 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
5414 keygen = GNUNET_CRYPTO_ecc_key_create_start (keyfile,
5417 GNUNET_free (keyfile);
5422 * The main function for the mesh service.
5424 * @param argc number of arguments from the command line
5425 * @param argv command line arguments
5426 * @return 0 ok, 1 on error
5429 main (int argc, char *const *argv)
5434 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main()\n");
5435 r = GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
5437 ret = (GNUNET_OK == r) ? 0 : 1;
5438 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main() END\n");
5442 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5443 "Mesh for peer [%s] FWD ACKs %u, BCK ACKs %u\n",
5444 GNUNET_i2s(&my_full_id), debug_fwd_ack, debug_bck_ack);