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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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
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,\
54 #define MESH_RETRANSMIT_TIME GNUNET_TIME_UNIT_SECONDS
55 #define MESH_RETRANSMIT_MARGIN 4
57 #if MESH_DEBUG_CONNECTION
58 #define DEBUG_CONN(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
60 #define DEBUG_CONN(...)
64 #define DEBUG_DHT(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
66 #define DEBUG_DHT(...)
73 struct timespec __mesh_start;
74 struct timespec __mesh_end;
75 #define INTERVAL_START clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_start))
76 #define INTERVAL_END \
78 clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_end));\
79 double __diff = __mesh_end.tv_nsec - __mesh_start.tv_nsec;\
80 if (__diff < 0) __diff += 1000000000;\
84 #define INTERVAL_SHOW \
86 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "AVG process time: %f ns\n", __sum/__count)
88 #define INTERVAL_START
93 /******************************************************************************/
94 /************************ DATA STRUCTURES ****************************/
95 /******************************************************************************/
97 /** FWD declaration */
103 * Struct containing info about a queued transmission to this peer
110 struct MeshPeerQueue *next;
115 struct MeshPeerQueue *prev;
118 * Peer this transmission is directed to.
120 struct MeshPeerInfo *peer;
123 * Tunnel this message belongs to.
125 struct MeshTunnel *tunnel;
128 * Pointer to info stucture used as cls.
138 * Size of the message
145 * Struct containing all information regarding a given peer
155 * Last time we heard from this peer
157 struct GNUNET_TIME_Absolute last_contact;
160 * Number of attempts to reconnect so far
162 int n_reconnect_attempts;
165 * Paths to reach the peer, ordered by ascending hop count
167 struct MeshPeerPath *path_head;
170 * Paths to reach the peer, ordered by ascending hop count
172 struct MeshPeerPath *path_tail;
175 * Handle to stop the DHT search for a path to this peer
177 struct GNUNET_DHT_GetHandle *dhtget;
180 * Array of tunnels this peer is the target of.
181 * Most probably a small amount, therefore not a hashmap.
182 * When the path to the peer changes, notify these tunnels to let them
183 * re-adjust their path trees.
185 struct MeshTunnel **tunnels;
188 * Number of tunnels this peers participates in
190 unsigned int ntunnels;
193 * Transmission queue to core DLL head
195 struct MeshPeerQueue *queue_head;
198 * Transmission queue to core DLL tail
200 struct MeshPeerQueue *queue_tail;
203 * How many messages are in the queue to this peer.
205 unsigned int queue_n;
208 * Handle for queued transmissions
210 struct GNUNET_CORE_TransmitHandle *core_transmit;
215 * Struct to encapsulate all the Flow Control information to a peer in the
216 * context of a tunnel: Same peer in different tunnels will have independent
217 * flow control structures, allowing to choke/free tunnels according to its
220 struct MeshFlowControl
223 * ID of the last packet sent towards the peer.
225 uint32_t last_pid_sent;
228 * ID of the last packet received from the peer.
230 uint32_t last_pid_recv;
233 * Last ACK sent to the peer (peer can't send more than this PID).
235 uint32_t last_ack_sent;
238 * Last ACK sent towards the origin (for traffic towards leaf node).
240 uint32_t last_ack_recv;
243 * How many payload messages are in the queue towards this peer.
248 * Task to poll the peer in case of a lost ACK causes stall.
250 GNUNET_SCHEDULER_TaskIdentifier poll_task;
253 * How frequently to poll for ACKs.
255 struct GNUNET_TIME_Relative poll_time;
258 * On which tunnel to poll.
259 * Using an explicit poll_ctx would not help memory wise,
260 * since the allocated context would have to be stored in the
261 * fc struct in order to free it upon cancelling poll_task.
263 struct MeshTunnel *t;
268 * Globally unique tunnel identification (owner + number)
269 * DO NOT USE OVER THE NETWORK
274 * Node that owns the tunnel
279 * Tunnel number to differentiate all the tunnels owned by the node oid
280 * ( tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI )
282 MESH_TunnelNumber tid;
287 * Data needed for reliable tunnel endpoint retransmission management.
289 struct MeshTunnelReliability;
293 * Info needed to retry a message in case it gets lost.
295 struct MeshReliableMessage
298 * Double linked list, FIFO style
300 struct MeshReliableMessage *next;
301 struct MeshReliableMessage *prev;
304 * Tunnel Reliability queue this message is in.
306 struct MeshTunnelReliability *rel;
309 * ID of the message (ACK needed to free)
314 * When was this message issued (to calculate ACK delay) FIXME update with traffic
316 struct GNUNET_TIME_Absolute timestamp;
318 /* struct GNUNET_MESH_Data with payload */
322 struct MeshTunnelReliability
325 * Tunnel this is about.
327 struct MeshTunnel *t;
330 * DLL of messages sent and not yet ACK'd.
332 struct MeshReliableMessage *head_sent;
333 struct MeshReliableMessage *tail_sent;
346 * DLL of messages received out of order.
348 struct MeshReliableMessage *head_recv;
349 struct MeshReliableMessage *tail_recv;
354 * Task to resend/poll in case no ACK is received.
356 GNUNET_SCHEDULER_TaskIdentifier retry_task;
359 * Counter for exponential backoff.
361 struct GNUNET_TIME_Relative retry_timer;
364 * How long does it usually take to get an ACK. FIXME update with traffic
366 struct GNUNET_TIME_Relative expected_delay;
371 * Struct containing all information regarding a tunnel
372 * For an intermediate node the improtant info used will be:
373 * - id Tunnel unique identification
374 * - paths[0] To know where to send it next
375 * - metainfo: ready, speeds, accounting
382 struct MESH_TunnelID id;
385 * Port of the tunnel.
390 * State of the tunnel.
392 enum MeshTunnelState state;
395 * Local tunnel number ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI or 0 )
397 MESH_TunnelNumber local_tid;
400 * Local tunnel number for local destination clients (incoming number)
401 * ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV or 0). All clients share the same
404 MESH_TunnelNumber local_tid_dest;
407 * Is the tunnel bufferless (minimum latency)?
412 * Is the tunnel reliable?
417 * Force sending ACK? Flag to allow duplicate ACK on POLL.
422 * How many messages do we accept in the forward queue.
424 unsigned int queue_max;
427 * Last time the tunnel was used
429 struct GNUNET_TIME_Absolute timestamp;
432 * Destination of the tunnel.
437 * Next hop in the tunnel. If 0, @c client must be set.
439 GNUNET_PEER_Id next_hop;
442 * Previous hop in the tunnel. If 0, @c owner must be set.
444 GNUNET_PEER_Id prev_hop;
447 * Flow control information about @c next_hop or @c client.
449 struct MeshFlowControl next_fc;
452 * Flow control information about @c prev_hop or @c owner.
454 struct MeshFlowControl prev_fc;
457 * Client owner of the tunnel, if any
459 struct MeshClient *owner;
462 * Client destination of the tunnel, if any.
464 struct MeshClient *client;
467 * Task to keep the used paths alive at the owner,
468 * time tunnel out on all the other peers.
470 GNUNET_SCHEDULER_TaskIdentifier maintenance_task;
473 * Path being used for the tunnel.
475 struct MeshPeerPath *path;
478 * Flag to signal the destruction of the tunnel.
479 * If this is set GNUNET_YES the tunnel will be destroyed
480 * when the queue is empty.
485 * Total messages pending for this tunnels, payload or not.
487 unsigned int pending_messages;
491 * Only present (non-NULL) at the owner of a tunnel.
493 struct MeshTunnelReliability *fwd_rel;
497 * Only present (non-NULL) at the destination of a tunnel.
499 struct MeshTunnelReliability *bck_rel;
504 * Struct containing information about a client of the service
506 * TODO: add a list of 'waiting' ports
513 struct MeshClient *next;
518 struct MeshClient *prev;
521 * Tunnels that belong to this client, indexed by local id
523 struct GNUNET_CONTAINER_MultiHashMap32 *own_tunnels;
526 * Tunnels this client has accepted, indexed by incoming local id
528 struct GNUNET_CONTAINER_MultiHashMap32 *incoming_tunnels;
531 * Handle to communicate with the client
533 struct GNUNET_SERVER_Client *handle;
536 * Ports that this client has declared interest in.
537 * Indexed by port, contains *Client.
539 struct GNUNET_CONTAINER_MultiHashMap32 *ports;
542 * Whether the client is active or shutting down (don't send confirmations
543 * to a client that is shutting down.
548 * ID of the client, mainly for debug messages
555 /******************************************************************************/
556 /************************ DEBUG FUNCTIONS ****************************/
557 /******************************************************************************/
561 * GNUNET_SCHEDULER_Task for printing a message after some operation is done
562 * @param cls string to print
563 * @param success GNUNET_OK if the PUT was transmitted,
564 * GNUNET_NO on timeout,
565 * GNUNET_SYSERR on disconnect from service
566 * after the PUT message was transmitted
567 * (so we don't know if it was received or not)
572 mesh_debug (void *cls, int success)
576 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%s (%d)\n", s, success);
581 unsigned int debug_fwd_ack;
582 unsigned int debug_bck_ack;
586 /******************************************************************************/
587 /*********************** GLOBAL VARIABLES ****************************/
588 /******************************************************************************/
590 /************************** Configuration parameters **************************/
593 * How often to send tunnel keepalives. Tunnels timeout after 4 missed.
595 static struct GNUNET_TIME_Relative refresh_path_time;
598 * How often to PUT own ID in the DHT.
600 static struct GNUNET_TIME_Relative id_announce_time;
603 * Maximum time allowed to connect to a peer found by string.
605 static struct GNUNET_TIME_Relative connect_timeout;
608 * Default TTL for payload packets.
610 static unsigned long long default_ttl;
613 * DHT replication level, see DHT API: GNUNET_DHT_get_start, GNUNET_DHT_put.
615 static unsigned long long dht_replication_level;
618 * How many tunnels are we willing to maintain.
619 * Local tunnels are always allowed, even if there are more tunnels than max.
621 static unsigned long long max_tunnels;
624 * How many messages *in total* are we willing to queue, divided by number of
625 * tunnels to get tunnel queue size.
627 static unsigned long long max_msgs_queue;
630 * How many peers do we want to remember?
632 static unsigned long long max_peers;
635 * Percentage of messages that will be dropped (for test purposes only).
637 static unsigned long long drop_percent;
639 /*************************** Static global variables **************************/
642 * DLL with all the clients, head.
644 static struct MeshClient *clients_head;
647 * DLL with all the clients, tail.
649 static struct MeshClient *clients_tail;
652 * Tunnels known, indexed by MESH_TunnelID (MeshTunnel).
654 static struct GNUNET_CONTAINER_MultiHashMap *tunnels;
657 * Number of tunnels known.
659 static unsigned long long n_tunnels;
662 * Tunnels incoming, indexed by MESH_TunnelNumber
663 * (which is greater than GNUNET_MESH_LOCAL_TUNNEL_ID_SERV).
665 static struct GNUNET_CONTAINER_MultiHashMap32 *incoming_tunnels;
668 * Peers known, indexed by PeerIdentity (MeshPeerInfo).
670 static struct GNUNET_CONTAINER_MultiHashMap *peers;
673 * Handle to communicate with transport
675 // static struct GNUNET_TRANSPORT_Handle *transport_handle;
678 * Handle to communicate with core.
680 static struct GNUNET_CORE_Handle *core_handle;
685 static struct GNUNET_DHT_Handle *dht_handle;
690 static struct GNUNET_SERVER_Handle *server_handle;
693 * Handle to the statistics service.
695 static struct GNUNET_STATISTICS_Handle *stats;
698 * Notification context, to send messages to local clients.
700 static struct GNUNET_SERVER_NotificationContext *nc;
703 * Local peer own ID (memory efficient handle).
705 static GNUNET_PEER_Id myid;
708 * Local peer own ID (full value).
710 static struct GNUNET_PeerIdentity my_full_id;
715 static struct GNUNET_CRYPTO_EccPrivateKey *my_private_key;
720 static struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded my_public_key;
723 * Tunnel ID for the next created tunnel (global tunnel number).
725 static MESH_TunnelNumber next_tid;
728 * Tunnel ID for the next incoming tunnel (local tunnel number).
730 static MESH_TunnelNumber next_local_tid;
733 * All ports clients of this peer have opened.
735 static struct GNUNET_CONTAINER_MultiHashMap32 *ports;
738 * Task to periodically announce itself in the network.
740 GNUNET_SCHEDULER_TaskIdentifier announce_id_task;
743 * Next ID to assign to a client.
745 unsigned int next_client_id;
748 /******************************************************************************/
749 /*********************** DECLARATIONS **************************/
750 /******************************************************************************/
753 * Function to process paths received for a new peer addition. The recorded
754 * paths form the initial tunnel, which can be optimized later.
755 * Called on each result obtained for the DHT search.
758 * @param exp when will this value expire
759 * @param key key of the result
760 * @param type type of the result
761 * @param size number of bytes in data
762 * @param data pointer to the result data
765 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
766 const struct GNUNET_HashCode * key,
767 const struct GNUNET_PeerIdentity *get_path,
768 unsigned int get_path_length,
769 const struct GNUNET_PeerIdentity *put_path,
770 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
771 size_t size, const void *data);
775 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
776 * and insert it in the appropriate structures if the peer is not known yet.
778 * @param peer Full identity of the peer.
780 * @return Existing or newly created peer info.
782 static struct MeshPeerInfo *
783 peer_get (const struct GNUNET_PeerIdentity *peer);
787 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
788 * and insert it in the appropriate structures if the peer is not known yet.
790 * @param peer Short identity of the peer.
792 * @return Existing or newly created peer info.
794 static struct MeshPeerInfo *
795 peer_get_short (const GNUNET_PEER_Id peer);
799 * Build a PeerPath from the paths returned from the DHT, reversing the paths
800 * to obtain a local peer -> destination path and interning the peer ids.
802 * @return Newly allocated and created path
804 static struct MeshPeerPath *
805 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
806 unsigned int get_path_length,
807 const struct GNUNET_PeerIdentity *put_path,
808 unsigned int put_path_length);
812 * Adds a path to the peer_infos of all the peers in the path
814 * @param p Path to process.
815 * @param confirmed Whether we know if the path works or not.
818 path_add_to_peers (struct MeshPeerPath *p, int confirmed);
823 * Search for a tunnel by global ID using full PeerIdentities.
825 * @param oid owner of the tunnel.
826 * @param tid global tunnel number.
828 * @return tunnel handler, NULL if doesn't exist.
830 static struct MeshTunnel *
831 tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid);
835 * Notify a tunnel that a connection has broken that affects at least
838 * @param t Tunnel affected.
839 * @param p1 Peer that got disconnected from p2.
840 * @param p2 Peer that got disconnected from p1.
842 * @return Short ID of the peer disconnected (either p1 or p2).
843 * 0 if the tunnel remained unaffected.
845 static GNUNET_PEER_Id
846 tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
851 * @brief Use the given path for the tunnel.
852 * Update the next and prev hops (and RCs).
853 * (Re)start the path refresh in case the tunnel is locally owned.
855 * @param t Tunnel to update.
856 * @param p Path to use.
859 tunnel_use_path (struct MeshTunnel *t, struct MeshPeerPath *p);
862 * Tunnel is empty: destroy it.
864 * Notifies all participants (peers, cleints) about the destruction.
866 * @param t Tunnel to destroy.
869 tunnel_destroy_empty (struct MeshTunnel *t);
872 * @brief Queue and pass message to core when possible.
874 * If type is payload (UNICAST, TO_ORIGIN, MULTICAST) checks for queue status
875 * and accounts for it. In case the queue is full, the message is dropped and
878 * Otherwise, message is treated as internal and allowed to go regardless of
881 * @param cls Closure (@c type dependant). It will be used by queue_send to
882 * build the message to be sent if not already prebuilt.
883 * @param type Type of the message, 0 for a raw message.
884 * @param size Size of the message.
885 * @param dst Neighbor to send message to.
886 * @param t Tunnel this message belongs to.
889 queue_add (void *cls, uint16_t type, size_t size,
890 struct MeshPeerInfo *dst, struct MeshTunnel *t);
894 * Free a transmission that was already queued with all resources
895 * associated to the request.
897 * @param queue Queue handler to cancel.
898 * @param clear_cls Is it necessary to free associated cls?
901 queue_destroy (struct MeshPeerQueue *queue, int clear_cls);
905 * @brief Get the next transmittable message from the queue.
907 * This will be the head, except in the case of being a data packet
908 * not allowed by the destination peer.
910 * @param peer Destination peer.
912 * @return The next viable MeshPeerQueue element to send to that peer.
913 * NULL when there are no transmittable messages.
915 struct MeshPeerQueue *
916 queue_get_next (const struct MeshPeerInfo *peer);
920 * Core callback to write a queued packet to core buffer
922 * @param cls Closure (peer info).
923 * @param size Number of bytes available in buf.
924 * @param buf Where the to write the message.
926 * @return number of bytes written to buf
929 queue_send (void *cls, size_t size, void *buf);
932 /******************************************************************************/
933 /************************ PERIODIC FUNCTIONS ****************************/
934 /******************************************************************************/
937 * Periodically announce self id in the DHT
940 * @param tc task context
943 announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
947 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
949 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
953 * - Set data expiration in function of X
956 DEBUG_DHT ("DHT_put for ID %s started.\n", GNUNET_i2s (&my_full_id));
958 block.id = my_full_id;
959 GNUNET_DHT_put (dht_handle, /* DHT handle */
960 &my_full_id.hashPubKey, /* Key to use */
961 dht_replication_level, /* Replication level */
962 GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, /* DHT options */
963 GNUNET_BLOCK_TYPE_MESH_PEER, /* Block type */
964 sizeof (block), /* Size of the data */
965 (const char *) &block, /* Data itself */
966 GNUNET_TIME_UNIT_FOREVER_ABS, /* Data expiration */
967 GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */
968 NULL, /* Continuation */
969 NULL); /* Continuation closure */
971 GNUNET_SCHEDULER_add_delayed (id_announce_time, &announce_id, cls);
975 /******************************************************************************/
976 /****************** GENERAL HELPER FUNCTIONS ************************/
977 /******************************************************************************/
981 * Check if client has registered with the service and has not disconnected
983 * @param client the client to check
985 * @return non-NULL if client exists in the global DLL
987 static struct MeshClient *
988 client_get (struct GNUNET_SERVER_Client *client)
990 return GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
995 * Deletes a tunnel from a client (either owner or destination). To be used on
998 * @param c Client whose tunnel to delete.
999 * @param t Tunnel which should be deleted.
1002 client_delete_tunnel (struct MeshClient *c, struct MeshTunnel *t)
1006 GNUNET_assert (GNUNET_YES ==
1007 GNUNET_CONTAINER_multihashmap32_remove (c->own_tunnels,
1013 GNUNET_assert (GNUNET_YES ==
1014 GNUNET_CONTAINER_multihashmap32_remove (c->incoming_tunnels,
1021 * Notify the appropriate client that a new incoming tunnel was created.
1023 * @param t Tunnel that was created.
1026 send_client_tunnel_create (struct MeshTunnel *t)
1028 struct GNUNET_MESH_TunnelMessage msg;
1030 if (NULL == t->client)
1032 msg.header.size = htons (sizeof (msg));
1033 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
1034 msg.tunnel_id = htonl (t->local_tid_dest);
1035 msg.port = htonl (t->port);
1037 msg.options |= GNUNET_YES == t->reliable ? GNUNET_MESH_OPTION_RELIABLE : 0;
1038 msg.options |= GNUNET_YES == t->nobuffer ? GNUNET_MESH_OPTION_NOBUFFER : 0;
1039 msg.options = htonl (msg.options);
1040 GNUNET_PEER_resolve (t->id.oid, &msg.peer);
1041 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
1042 &msg.header, GNUNET_NO);
1047 * Notify dest client that the incoming tunnel is no longer valid.
1049 * @param c Client to notify..
1050 * @param t Tunnel that is destroyed.
1053 send_client_tunnel_destroy (struct MeshClient *c, struct MeshTunnel *t)
1055 struct GNUNET_MESH_TunnelMessage msg;
1062 if (c != t->client && c != t->owner)
1067 msg.header.size = htons (sizeof (msg));
1068 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1069 msg.tunnel_id = htonl (t->local_tid_dest);
1070 msg.port = htonl (0);
1071 memset(&msg.peer, 0, sizeof (msg.peer));
1072 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
1073 &msg.header, GNUNET_NO);
1078 * Iterator over all the peers to remove the oldest not-used entry.
1080 * @param cls Closure (unsued).
1081 * @param key ID of the peer.
1082 * @param value Peer_Info of the peer.
1087 peer_info_timeout (void *cls,
1088 const struct GNUNET_HashCode *key,
1095 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
1096 * and insert it in the appropriate structures if the peer is not known yet.
1098 * @param peer Full identity of the peer.
1100 * @return Existing or newly created peer info.
1102 static struct MeshPeerInfo *
1103 peer_get (const struct GNUNET_PeerIdentity *peer)
1105 struct MeshPeerInfo *peer_info;
1107 peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
1108 if (NULL == peer_info)
1111 (struct MeshPeerInfo *) GNUNET_malloc (sizeof (struct MeshPeerInfo));
1112 if (GNUNET_CONTAINER_multihashmap_size (peers) > max_peers)
1114 GNUNET_CONTAINER_multihashmap_iterate (peers,
1118 GNUNET_CONTAINER_multihashmap_put (peers, &peer->hashPubKey, peer_info,
1119 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
1120 peer_info->id = GNUNET_PEER_intern (peer);
1122 peer_info->last_contact = GNUNET_TIME_absolute_get();
1129 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
1130 * and insert it in the appropriate structures if the peer is not known yet.
1132 * @param peer Short identity of the peer.
1134 * @return Existing or newly created peer info.
1136 static struct MeshPeerInfo *
1137 peer_get_short (const GNUNET_PEER_Id peer)
1139 struct GNUNET_PeerIdentity id;
1141 GNUNET_PEER_resolve (peer, &id);
1142 return peer_get (&id);
1147 * Choose the best path towards a peer considering the tunnel properties.
1149 * @param peer The destination peer.
1150 * @param t The tunnel the path is for.
1152 * @return Best current known path towards the peer, if any.
1154 static struct MeshPeerPath *
1155 peer_get_best_path (const struct MeshPeerInfo *peer, const struct MeshTunnel *t)
1157 struct MeshPeerPath *best_p;
1158 struct MeshPeerPath *p;
1159 unsigned int best_cost;
1162 best_p = p = peer->path_head;
1163 best_cost = cost = p->length;
1166 if ((cost = p->length) < best_cost)
1177 * Core callback to write a pre-constructed data packet to core buffer
1179 * @param cls Closure (MeshTransmissionDescriptor with data in "data" member).
1180 * @param size Number of bytes available in buf.
1181 * @param buf Where the to write the message.
1183 * @return number of bytes written to buf
1186 send_core_data_raw (void *cls, size_t size, void *buf)
1188 struct GNUNET_MessageHeader *msg = cls;
1191 GNUNET_assert (NULL != msg);
1192 total_size = ntohs (msg->size);
1194 if (total_size > size)
1199 memcpy (buf, msg, total_size);
1206 * Sends an already built message to a peer, properly registrating
1207 * all used resources.
1209 * @param message Message to send. Function makes a copy of it.
1210 * @param peer Short ID of the neighbor whom to send the message.
1211 * @param t Tunnel on which this message is transmitted.
1214 send_prebuilt_message (const struct GNUNET_MessageHeader *message,
1215 GNUNET_PEER_Id peer,
1216 struct MeshTunnel *t)
1218 struct GNUNET_PeerIdentity id;
1219 struct MeshPeerInfo *neighbor;
1220 struct MeshPeerPath *p;
1225 // GNUNET_TRANSPORT_try_connect(); FIXME use?
1230 size = ntohs (message->size);
1231 data = GNUNET_malloc (size);
1232 memcpy (data, message, size);
1233 type = ntohs(message->type);
1234 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type ||
1235 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type)
1237 struct GNUNET_MESH_Data *u;
1239 u = (struct GNUNET_MESH_Data *) data;
1240 u->ttl = htonl (ntohl (u->ttl) - 1);
1242 GNUNET_PEER_resolve (peer, &id);
1243 neighbor = peer_get (&id);
1244 for (p = neighbor->path_head; NULL != p; p = p->next)
1254 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1255 " %s IS NOT DIRECTLY CONNECTED\n",
1257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1260 for (p = neighbor->path_head; NULL != p; p = p->next)
1262 struct GNUNET_PeerIdentity debug_id;
1265 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1266 " path with %u hops through:\n",
1268 for (i = 0; i < p->length; i++)
1270 GNUNET_PEER_resolve(p->peers[i], &debug_id);
1271 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1273 i, GNUNET_i2s(&debug_id));
1277 GNUNET_break (0); // FIXME sometimes fails (testing disconnect?)
1278 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1279 " no direct connection to %s\n",
1284 if (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK == type)
1295 * Sends a CREATE PATH message for a path to a peer, properly registrating
1296 * all used resources.
1298 * @param t Tunnel for which the path is created.
1301 send_create_path (struct MeshTunnel *t)
1303 struct MeshPeerInfo *neighbor;
1305 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send create path\n");
1306 neighbor = peer_get_short (t->next_hop);
1308 GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE,
1309 sizeof (struct GNUNET_MESH_CreateTunnel) +
1310 (t->path->length * sizeof (struct GNUNET_PeerIdentity)),
1313 t->state = MESH_TUNNEL_WAITING;
1318 * Sends a PATH ACK message in reponse to a received PATH_CREATE directed to us.
1320 * @param t Tunnel which to confirm.
1323 send_path_ack (struct MeshTunnel *t)
1325 struct MeshPeerInfo *peer;
1327 peer = peer_get_short (t->prev_hop);
1330 GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
1331 sizeof (struct GNUNET_MESH_PathACK),
1338 * Try to establish a new connection to this peer in the given tunnel.
1339 * If the peer doesn't have any path to it yet, try to get one.
1340 * If the peer already has some path, send a CREATE PATH towards it.
1342 * @param peer PeerInfo of the peer.
1343 * @param t Tunnel for which to create the path, if possible.
1346 peer_connect (struct MeshPeerInfo *peer, struct MeshTunnel *t)
1348 struct MeshPeerPath *p;
1350 if (NULL != peer->path_head)
1352 p = peer_get_best_path (peer, t);
1353 tunnel_use_path (t, p);
1354 send_create_path (t);
1356 else if (NULL == peer->dhtget)
1358 struct GNUNET_PeerIdentity id;
1360 GNUNET_PEER_resolve (peer->id, &id);
1361 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1362 " Starting DHT GET for peer %s\n", GNUNET_i2s (&id));
1363 peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
1364 GNUNET_BLOCK_TYPE_MESH_PEER, /* type */
1365 &id.hashPubKey, /* key to search */
1366 dht_replication_level, /* replication level */
1367 GNUNET_DHT_RO_RECORD_ROUTE |
1368 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
1370 0, /* xquery bits */
1371 &dht_get_id_handler, peer);
1372 t->state = MESH_TUNNEL_SEARCHING;
1376 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1377 "There is no path but the DHT GET is already started.\n");
1383 * Destroy the peer_info and free any allocated resources linked to it
1385 * @param pi The peer_info to destroy.
1387 * @return GNUNET_OK on success
1390 peer_info_destroy (struct MeshPeerInfo *pi)
1392 struct GNUNET_PeerIdentity id;
1393 struct MeshPeerPath *p;
1394 struct MeshPeerPath *nextp;
1397 GNUNET_PEER_resolve (pi->id, &id);
1398 GNUNET_PEER_change_rc (pi->id, -1);
1401 GNUNET_CONTAINER_multihashmap_remove (peers, &id.hashPubKey, pi))
1404 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1405 "removing peer %s, not in hashmap\n", GNUNET_i2s (&id));
1407 if (NULL != pi->dhtget)
1409 GNUNET_DHT_get_stop (pi->dhtget);
1415 GNUNET_CONTAINER_DLL_remove (pi->path_head, pi->path_tail, p);
1419 for (i = 0; i < pi->ntunnels; i++)
1420 tunnel_destroy_empty (pi->tunnels[i]);
1421 GNUNET_array_grow (pi->tunnels, pi->ntunnels, 0);
1428 * Remove all paths that rely on a direct connection between p1 and p2
1429 * from the peer itself and notify all tunnels about it.
1431 * @param peer PeerInfo of affected peer.
1432 * @param p1 GNUNET_PEER_Id of one peer.
1433 * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and
1436 * TODO: optimize (see below)
1439 peer_remove_path (struct MeshPeerInfo *peer, GNUNET_PEER_Id p1,
1442 struct MeshPeerPath *p;
1443 struct MeshPeerPath *next;
1444 struct MeshPeerInfo *peer_d;
1446 unsigned int destroyed;
1449 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path\n");
1451 for (p = peer->path_head; NULL != p; p = next)
1454 for (i = 0; i < (p->length - 1); i++)
1456 if ((p->peers[i] == p1 && p->peers[i + 1] == p2) ||
1457 (p->peers[i] == p2 && p->peers[i + 1] == p1))
1459 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
1469 for (i = 0; i < peer->ntunnels; i++)
1471 d = tunnel_notify_connection_broken (peer->tunnels[i], p1, p2);
1475 peer_d = peer_get_short (d);
1476 next = peer_get_best_path (peer_d, peer->tunnels[i]);
1477 tunnel_use_path (peer->tunnels[i], next);
1478 peer_connect (peer_d, peer->tunnels[i]);
1480 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path END\n");
1485 * Add the path to the peer and update the path used to reach it in case this
1488 * @param peer_info Destination peer to add the path to.
1489 * @param path New path to add. Last peer must be the peer in arg 1.
1490 * Path will be either used of freed if already known.
1491 * @param trusted Do we trust that this path is real?
1494 peer_info_add_path (struct MeshPeerInfo *peer_info, struct MeshPeerPath *path,
1497 struct MeshPeerPath *aux;
1501 if ((NULL == peer_info) || (NULL == path))
1504 path_destroy (path);
1507 if (path->peers[path->length - 1] != peer_info->id)
1510 path_destroy (path);
1513 if (2 >= path->length && GNUNET_NO == trusted)
1515 /* Only allow CORE to tell us about direct paths */
1516 path_destroy (path);
1519 for (l = 1; l < path->length; l++)
1521 if (path->peers[l] == myid)
1523 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shortening path by %u\n", l);
1524 for (l2 = 0; l2 < path->length - l; l2++)
1526 path->peers[l2] = path->peers[l + l2];
1531 GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id));
1536 struct GNUNET_PeerIdentity id;
1538 GNUNET_PEER_resolve (peer_info->id, &id);
1539 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
1540 path->length, GNUNET_i2s (&id));
1543 l = path_get_length (path);
1546 path_destroy (path);
1550 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
1551 for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
1553 l2 = path_get_length (aux);
1556 GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
1557 peer_info->path_tail, aux, path);
1562 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
1564 path_destroy (path);
1569 GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail,
1576 * Add the path to the origin peer and update the path used to reach it in case
1577 * this is the shortest.
1578 * The path is given in peer_info -> destination, therefore we turn the path
1579 * upside down first.
1581 * @param peer_info Peer to add the path to, being the origin of the path.
1582 * @param path New path to add after being inversed.
1583 * Path will be either used or freed.
1584 * @param trusted Do we trust that this path is real?
1587 peer_info_add_path_to_origin (struct MeshPeerInfo *peer_info,
1588 struct MeshPeerPath *path, int trusted)
1591 peer_info_add_path (peer_info, path, trusted);
1596 * Add a tunnel to the list of tunnels a peer participates in.
1597 * Update the tunnel's destination.
1599 * @param p Peer to add to.
1600 * @param t Tunnel to add.
1603 peer_info_add_tunnel (struct MeshPeerInfo *p, struct MeshTunnel *t)
1607 GNUNET_break (t->dest == p->id);
1611 GNUNET_PEER_change_rc (t->dest, 1);
1612 GNUNET_array_append (p->tunnels, p->ntunnels, t);
1617 * Remove a tunnel from the list of tunnels a peer participates in.
1618 * Free the tunnel's destination.
1620 * @param p Peer to clean.
1621 * @param t Tunnel to remove.
1624 peer_info_remove_tunnel (struct MeshPeerInfo *p, struct MeshTunnel *t)
1628 if (t->dest == p->id)
1630 GNUNET_PEER_change_rc (t->dest, -1);
1633 for (i = 0; i < p->ntunnels; i++)
1635 if (p->tunnels[i] == t)
1637 p->tunnels[i] = p->tunnels[p->ntunnels - 1];
1638 GNUNET_array_grow (p->tunnels, p->ntunnels, p->ntunnels - 1);
1646 * Function called if the connection to the peer has been stalled for a while,
1647 * possibly due to a missed ACK. Poll the peer about its ACK status.
1649 * @param cls Closure (poll ctx).
1650 * @param tc TaskContext.
1653 tunnel_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1655 struct MeshFlowControl *fc = cls;
1656 struct GNUNET_MESH_Poll msg;
1657 struct MeshTunnel *t = fc->t;
1658 GNUNET_PEER_Id peer;
1660 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
1661 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1666 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** Polling!\n");
1668 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL);
1669 msg.header.size = htons (sizeof (msg));
1670 msg.tid = htonl (t->id.tid);
1671 msg.pid = htonl (fc->last_pid_sent);
1672 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
1674 if (fc == &t->prev_fc)
1676 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** prev peer!\n");
1679 else if (fc == &t->next_fc)
1681 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** next peer!\n");
1689 send_prebuilt_message (&msg.header, peer, t);
1690 fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
1691 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
1697 * Build a PeerPath from the paths returned from the DHT, reversing the paths
1698 * to obtain a local peer -> destination path and interning the peer ids.
1700 * @return Newly allocated and created path
1702 static struct MeshPeerPath *
1703 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
1704 unsigned int get_path_length,
1705 const struct GNUNET_PeerIdentity *put_path,
1706 unsigned int put_path_length)
1708 struct MeshPeerPath *p;
1714 GNUNET_PEER_change_rc (myid, 1);
1715 i = get_path_length;
1716 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " GET has %d hops.\n", i);
1717 for (i--; i >= 0; i--)
1719 id = GNUNET_PEER_intern (&get_path[i]);
1720 if (p->length > 0 && id == p->peers[p->length - 1])
1722 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
1723 GNUNET_PEER_change_rc (id, -1);
1727 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from GET: %s.\n",
1728 GNUNET_i2s (&get_path[i]));
1730 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
1731 p->peers[p->length - 1] = id;
1734 i = put_path_length;
1735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PUT has %d hops.\n", i);
1736 for (i--; i >= 0; i--)
1738 id = GNUNET_PEER_intern (&put_path[i]);
1741 /* PUT path went through us, so discard the path up until now and start
1742 * from here to get a much shorter (and loop-free) path.
1747 if (p->length > 0 && id == p->peers[p->length - 1])
1749 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
1750 GNUNET_PEER_change_rc (id, -1);
1754 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from PUT: %s.\n",
1755 GNUNET_i2s (&put_path[i]));
1757 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
1758 p->peers[p->length - 1] = id;
1762 if (get_path_length > 0)
1763 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of GET: %s)\n",
1764 GNUNET_i2s (&get_path[0]));
1765 if (put_path_length > 0)
1766 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of PUT: %s)\n",
1767 GNUNET_i2s (&put_path[0]));
1768 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " In total: %d hops\n",
1770 for (i = 0; i < p->length; i++)
1772 struct GNUNET_PeerIdentity peer_id;
1774 GNUNET_PEER_resolve (p->peers[i], &peer_id);
1775 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u: %s\n", p->peers[i],
1776 GNUNET_i2s (&peer_id));
1784 * Adds a path to the peer_infos of all the peers in the path
1786 * @param p Path to process.
1787 * @param confirmed Whether we know if the path works or not.
1790 path_add_to_peers (struct MeshPeerPath *p, int confirmed)
1794 /* TODO: invert and add */
1795 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
1796 for (i++; i < p->length; i++)
1798 struct MeshPeerInfo *aux;
1799 struct MeshPeerPath *copy;
1801 aux = peer_get_short (p->peers[i]);
1802 copy = path_duplicate (p);
1803 copy->length = i + 1;
1804 peer_info_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
1810 * Send keepalive packets for a peer
1812 * @param cls Closure (tunnel for which to send the keepalive).
1813 * @param tc Notification context.
1816 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
1820 * Search for a tunnel among the incoming tunnels
1822 * @param tid the local id of the tunnel
1824 * @return tunnel handler, NULL if doesn't exist
1826 static struct MeshTunnel *
1827 tunnel_get_incoming (MESH_TunnelNumber tid)
1829 GNUNET_assert (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV);
1830 return GNUNET_CONTAINER_multihashmap32_get (incoming_tunnels, tid);
1835 * Search for a tunnel among the tunnels for a client
1837 * @param c the client whose tunnels to search in
1838 * @param tid the local id of the tunnel
1840 * @return tunnel handler, NULL if doesn't exist
1842 static struct MeshTunnel *
1843 tunnel_get_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid)
1845 if (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1847 return tunnel_get_incoming (tid);
1851 GNUNET_assert (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI);
1852 return GNUNET_CONTAINER_multihashmap32_get (c->own_tunnels, tid);
1858 * Search for a tunnel by global ID using PEER_ID
1860 * @param pi owner of the tunnel
1861 * @param tid global tunnel number
1863 * @return tunnel handler, NULL if doesn't exist
1865 static struct MeshTunnel *
1866 tunnel_get_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid)
1868 struct MESH_TunnelID id;
1869 struct GNUNET_HashCode hash;
1874 GNUNET_CRYPTO_hash (&id, sizeof (struct MESH_TunnelID), &hash);
1875 return GNUNET_CONTAINER_multihashmap_get (tunnels, &hash);
1880 * Search for a tunnel by global ID using full PeerIdentities
1882 * @param oid owner of the tunnel
1883 * @param tid global tunnel number
1885 * @return tunnel handler, NULL if doesn't exist
1887 static struct MeshTunnel *
1888 tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid)
1890 return tunnel_get_by_pi (GNUNET_PEER_search (oid), tid);
1895 * Add a client to a tunnel, initializing all needed data structures.
1897 * @param t Tunnel to which add the client.
1898 * @param c Client which to add to the tunnel.
1901 tunnel_add_client (struct MeshTunnel *t, struct MeshClient *c)
1903 if (NULL != t->client)
1909 GNUNET_CONTAINER_multihashmap32_put (c->incoming_tunnels,
1910 t->local_tid_dest, t,
1911 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
1917 GNUNET_CONTAINER_multihashmap32_put (incoming_tunnels,
1918 t->local_tid_dest, t,
1919 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
1929 tunnel_use_path (struct MeshTunnel *t, struct MeshPeerPath *p)
1931 unsigned int own_pos;
1933 for (own_pos = 0; own_pos < p->length; own_pos++)
1935 if (p->peers[own_pos] == myid)
1938 if (own_pos > p->length - 1)
1944 if (own_pos < p->length - 1)
1945 t->next_hop = p->peers[own_pos + 1];
1947 t->next_hop = p->peers[own_pos];
1948 GNUNET_PEER_change_rc (t->next_hop, 1);
1950 t->prev_hop = p->peers[own_pos - 1];
1952 t->prev_hop = p->peers[0];
1953 GNUNET_PEER_change_rc (t->prev_hop, 1);
1955 if (NULL != t->path)
1956 path_destroy (t->path);
1957 t->path = path_duplicate (p);
1960 if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
1961 GNUNET_SCHEDULER_cancel (t->maintenance_task);
1962 t->maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_path_time,
1969 * Notifies a tunnel that a connection has broken that affects at least
1970 * some of its peers. Sends a notification towards the root of the tree.
1971 * In case the peer is the owner of the tree, notifies the client that owns
1972 * the tunnel and tries to reconnect.
1974 * @param t Tunnel affected.
1975 * @param p1 Peer that got disconnected from p2.
1976 * @param p2 Peer that got disconnected from p1.
1978 * @return Short ID of the peer disconnected (either p1 or p2).
1979 * 0 if the tunnel remained unaffected.
1981 static GNUNET_PEER_Id
1982 tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
1985 // if (myid != p1 && myid != p2) FIXME
1990 // if (tree_get_predecessor (t->tree) != 0)
1992 // /* We are the peer still connected, notify owner of the disconnection. */
1993 // struct GNUNET_MESH_PathBroken msg;
1994 // struct GNUNET_PeerIdentity neighbor;
1996 // msg.header.size = htons (sizeof (msg));
1997 // msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN);
1998 // GNUNET_PEER_resolve (t->id.oid, &msg.oid);
1999 // msg.tid = htonl (t->id.tid);
2000 // msg.peer1 = my_full_id;
2001 // GNUNET_PEER_resolve (pid, &msg.peer2);
2002 // GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor);
2003 // send_prebuilt_message (&msg.header, &neighbor, t);
2010 * Build a local ACK message and send it to a local client.
2012 * @param t Tunnel on which to send the ACK.
2013 * @param c Client to whom send the ACK.
2014 * @param is_fwd Set to GNUNET_YES for FWD ACK (dest->owner)
2017 send_local_ack (struct MeshTunnel *t,
2018 struct MeshClient *c,
2021 struct GNUNET_MESH_LocalAck msg;
2023 msg.header.size = htons (sizeof (msg));
2024 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
2025 msg.tunnel_id = htonl (is_fwd ? t->local_tid : t->local_tid_dest);
2026 GNUNET_SERVER_notification_context_unicast (nc,
2033 * Build an ACK message and queue it to send to the given peer.
2035 * @param t Tunnel on which to send the ACK.
2036 * @param peer Peer to whom send the ACK.
2037 * @param ack Value of the ACK.
2040 send_ack (struct MeshTunnel *t, GNUNET_PEER_Id peer, uint32_t ack)
2042 struct GNUNET_MESH_ACK msg;
2044 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2045 msg.header.size = htons (sizeof (msg));
2046 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK);
2047 msg.pid = htonl (ack);
2048 msg.tid = htonl (t->id.tid);
2050 send_prebuilt_message (&msg.header, peer, t);
2055 * Send an end-to-end FWD ACK message for the most recent in-sequence payload.
2057 * @param t Tunnel this is about.
2060 tunnel_send_fwd_data_ack (struct MeshTunnel *t)
2062 struct GNUNET_MESH_DataACK msg;
2064 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK);
2065 msg.header.size = htons (sizeof (msg));
2066 msg.tid = htonl (t->id.tid);
2067 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2068 msg.mid = GNUNET_htonll (t->bck_rel->mid_recv);
2069 msg.futures = 0; // FIXME set bits of other newer messages received
2071 send_prebuilt_message (&msg.header, t->prev_hop, t);
2076 * Send an end-to-end BCK ACK message for the most recent in-sequence payload.
2078 * @param t Tunnel this is about.
2081 tunnel_send_bck_data_ack (struct MeshTunnel *t)
2083 struct GNUNET_MESH_DataACK msg;
2085 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK);
2086 msg.header.size = htons (sizeof (msg));
2087 msg.tid = htonl (t->id.tid);
2088 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2089 msg.mid = GNUNET_htonll (t->fwd_rel->mid_recv);
2090 msg.futures = 0; // FIXME set bits of other newer messages received
2092 send_prebuilt_message (&msg.header, t->next_hop, t);
2097 * Send an ACK informing the predecessor about the available buffer space.
2098 * In case there is no predecessor, inform the owning client.
2099 * If buffering is off, send only on behalf of children or self if endpoint.
2100 * If buffering is on, send when sent to children and buffer space is free.
2101 * Note that although the name is fwd_ack, the FWD mean forward *traffic*,
2102 * the ACK itself goes "back" (towards root).
2104 * @param t Tunnel on which to send the ACK.
2105 * @param type Type of message that triggered the ACK transmission.
2108 tunnel_send_fwd_ack (struct MeshTunnel *t, uint16_t type)
2113 /* Is it after unicast retransmission? */
2116 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
2117 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2118 "ACK due to FWD DATA retransmission\n");
2119 if (GNUNET_YES == t->nobuffer)
2121 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, nobuffer\n");
2124 if (GNUNET_YES == t->reliable && NULL != t->client)
2125 tunnel_send_fwd_data_ack (t);
2127 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2128 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
2130 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2131 case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
2132 t->force_ack = GNUNET_YES;
2138 /* Check if we need to transmit the ACK */
2139 if (NULL == t->owner &&
2140 t->queue_max > t->next_fc.queue_n * 4 &&
2141 GMC_is_pid_bigger(t->prev_fc.last_ack_sent, t->prev_fc.last_pid_recv) &&
2142 GNUNET_NO == t->force_ack)
2144 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, buffer free\n");
2145 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2146 " t->qmax: %u, t->qn: %u\n",
2147 t->queue_max, t->next_fc.queue_n);
2148 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2149 " t->pid: %u, t->ack: %u\n",
2150 t->prev_fc.last_pid_recv, t->prev_fc.last_ack_sent);
2154 /* Ok, ACK might be necessary, what PID to ACK? */
2155 delta = t->queue_max - t->next_fc.queue_n;
2158 ack = t->prev_fc.last_pid_recv + delta;
2159 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK %u\n", ack);
2160 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2161 " last %u, qmax %u, q %u\n",
2162 t->prev_fc.last_pid_recv, t->queue_max, t->next_fc.queue_n);
2163 if (ack == t->prev_fc.last_ack_sent && GNUNET_NO == t->force_ack)
2165 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
2169 t->prev_fc.last_ack_sent = ack;
2170 if (NULL != t->owner)
2171 send_local_ack (t, t->owner, GNUNET_YES);
2172 else if (0 != t->prev_hop)
2173 send_ack (t, t->prev_hop, ack);
2177 t->force_ack = GNUNET_NO;
2182 * Send an ACK informing the children node/client about the available
2184 * If buffering is off, send only on behalf of root (can be self).
2185 * If buffering is on, send when sent to predecessor and buffer space is free.
2186 * Note that although the name is bck_ack, the BCK mean backwards *traffic*,
2187 * the ACK itself goes "forward" (towards children/clients).
2189 * @param t Tunnel on which to send the ACK.
2190 * @param type Type of message that triggered the ACK transmission.
2193 tunnel_send_bck_ack (struct MeshTunnel *t, uint16_t type)
2196 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2197 "Sending BCK ACK on tunnel %u [%u] due to %s\n",
2198 t->id.oid, t->id.tid, GNUNET_MESH_DEBUG_M2S(type));
2199 /* Is it after data to_origin retransmission? */
2202 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
2203 if (GNUNET_YES == t->nobuffer)
2205 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2206 " Not sending ACK, nobuffer + traffic\n");
2209 if (GNUNET_YES == t->reliable && NULL != t->owner)
2210 tunnel_send_bck_data_ack (t);
2212 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2213 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
2215 case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
2216 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2217 t->force_ack = GNUNET_YES;
2223 /* TODO: Check if we need to transmit the ACK (as in fwd) */
2225 ack = t->next_fc.last_pid_recv + t->queue_max - t->prev_fc.queue_n;
2227 if (t->next_fc.last_ack_sent == ack && GNUNET_NO == t->force_ack)
2229 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2230 " Not sending ACK, not needed, last ack sent was %u\n",
2231 t->next_fc.last_ack_sent);
2234 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2235 " Sending BCK ACK %u (last sent: %u)\n",
2236 ack, t->next_fc.last_ack_sent);
2237 t->next_fc.last_ack_sent = ack;
2239 if (NULL != t->client)
2240 send_local_ack (t, t->client, GNUNET_NO);
2241 else if (0 != t->next_hop)
2242 send_ack (t, t->next_hop, ack);
2245 t->force_ack = GNUNET_NO;
2250 * Modify the mesh message TID from global to local and send to client.
2252 * @param t Tunnel on which to send the message.
2253 * @param msg Message to modify and send.
2254 * @param c Client to send to.
2255 * @param tid Tunnel ID to use (c can be both owner and client).
2258 tunnel_send_client_data (struct MeshTunnel *t,
2259 const struct GNUNET_MESH_Data *msg,
2260 struct MeshClient *c, MESH_TunnelNumber tid)
2262 struct GNUNET_MESH_LocalData *copy;
2263 uint16_t size = ntohs (msg->header.size) - sizeof (struct GNUNET_MESH_Data);
2264 char cbuf[size + sizeof (struct GNUNET_MESH_LocalData)];
2266 if (size < sizeof (struct GNUNET_MessageHeader))
2268 GNUNET_break_op (0);
2276 copy = (struct GNUNET_MESH_LocalData *) cbuf;
2277 memcpy (©[1], &msg[1], size);
2278 copy->header.size = htons (sizeof (struct GNUNET_MESH_LocalData) + size);
2279 copy->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA);
2280 copy->tid = htonl (tid);
2281 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
2282 ©->header, GNUNET_NO);
2286 * Modify the unicast message TID from global to local and send to client.
2288 * @param t Tunnel on which to send the message.
2289 * @param msg Message to modify and send.
2292 tunnel_send_client_ucast (struct MeshTunnel *t,
2293 const struct GNUNET_MESH_Data *msg)
2295 tunnel_send_client_data (t, msg, t->client, t->local_tid_dest);
2300 * Modify the to_origin message TID from global to local and send to client.
2302 * @param t Tunnel on which to send the message.
2303 * @param msg Message to modify and send.
2306 tunnel_send_client_to_orig (struct MeshTunnel *t,
2307 const struct GNUNET_MESH_Data *msg)
2309 tunnel_send_client_data (t, msg, t->owner, t->local_tid);
2314 * We haven't received an ACK after a certain time: restransmit the message.
2316 * @param cls Closure (MeshReliableMessage with the message to restransmit)
2317 * @param tc TaskContext.
2320 tunnel_retransmit_message (void *cls,
2321 const struct GNUNET_SCHEDULER_TaskContext *tc)
2323 struct MeshTunnelReliability *rel = cls;
2324 struct MeshReliableMessage *copy;
2325 struct MeshFlowControl *fc;
2326 struct MeshPeerQueue *q;
2327 struct MeshPeerInfo *pi;
2328 struct MeshTunnel *t;
2329 struct GNUNET_MESH_Data *payload;
2332 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
2333 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2337 copy = rel->head_sent;
2344 /* Search the message to be retransmitted in the outgoing queue */
2345 payload = (struct GNUNET_MESH_Data *) ©[1];
2346 hop = rel == t->fwd_rel ? t->next_hop : t->prev_hop;
2347 fc = rel == t->fwd_rel ? &t->next_fc : &t->prev_fc;
2348 pi = peer_get_short (hop);
2349 for (q = pi->queue_head; NULL != q; q = q->next)
2351 if (ntohs (payload->header.type) == q->type)
2353 struct GNUNET_MESH_Data *queued_data = q->cls;
2355 if (queued_data->mid == payload->mid)
2360 /* Message not found in the queue */
2363 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RETRANSMIT %llu\n", copy->mid);
2364 copy->timestamp = GNUNET_TIME_absolute_get ();
2366 fc->last_ack_sent++;
2367 payload->pid = htonl (fc->last_pid_recv + 1);
2368 fc->last_pid_recv++;
2369 send_prebuilt_message (&payload->header, hop, t);
2370 GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO);
2374 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! STILL IN QUEUE %llu\n", copy->mid);
2377 rel->retry_timer = GNUNET_TIME_STD_BACKOFF (rel->retry_timer);
2378 rel->retry_task = GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
2379 &tunnel_retransmit_message,
2385 * @brief Re-initiate traffic to this peer if necessary.
2387 * Check if there is traffic queued towards this peer
2388 * and the core transmit handle is NULL (traffic was stalled).
2389 * If so, call core tmt rdy.
2391 * @param peer_id Short ID of peer to which initiate traffic.
2394 peer_unlock_queue(GNUNET_PEER_Id peer_id)
2396 struct MeshPeerInfo *peer;
2397 struct GNUNET_PeerIdentity id;
2398 struct MeshPeerQueue *q;
2401 peer = peer_get_short (peer_id);
2402 if (NULL != peer->core_transmit)
2405 q = queue_get_next (peer);
2408 /* Might br multicast traffic already sent to this particular peer but
2409 * not to other children in this tunnel.
2410 * This way t->queue_n would be > 0 but the queue of this particular peer
2416 GNUNET_PEER_resolve (peer->id, &id);
2417 peer->core_transmit =
2418 GNUNET_CORE_notify_transmit_ready(core_handle,
2421 GNUNET_TIME_UNIT_FOREVER_REL,
2431 * Send a message to all peers and clients in this tunnel that the tunnel
2432 * is no longer valid. If some peer or client should not receive the message,
2433 * should be zero'ed out before calling this function.
2435 * @param t The tunnel whose peers and clients to notify.
2438 tunnel_send_destroy (struct MeshTunnel *t)
2440 struct GNUNET_MESH_TunnelDestroy msg;
2441 struct GNUNET_PeerIdentity id;
2443 msg.header.size = htons (sizeof (msg));
2444 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);
2445 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2446 msg.tid = htonl (t->id.tid);
2447 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2448 " sending tunnel destroy for tunnel: %s [%X]\n",
2449 GNUNET_i2s (&msg.oid), t->id.tid);
2451 if (NULL == t->client && 0 != t->next_hop)
2453 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " child: %u\n", t->next_hop);
2454 GNUNET_PEER_resolve (t->next_hop, &id);
2455 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2456 " sending forward to %s\n",
2458 send_prebuilt_message (&msg.header, t->next_hop, t);
2460 if (NULL == t->owner && 0 != t->prev_hop)
2462 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " parent: %u\n", t->prev_hop);
2463 GNUNET_PEER_resolve (t->prev_hop, &id);
2464 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2465 " sending back to %s\n",
2467 send_prebuilt_message (&msg.header, t->prev_hop, t);
2469 if (NULL != t->owner)
2471 send_client_tunnel_destroy (t->owner, t);
2473 if (NULL != t->client)
2475 send_client_tunnel_destroy (t->client, t);
2481 * Cancel all transmissions towards a neighbor that belongs to a certain tunnel.
2483 * @param t Tunnel which to cancel.
2484 * @param neighbor Short ID of the neighbor to whom cancel the transmissions.
2487 peer_cancel_queues (GNUNET_PEER_Id neighbor, struct MeshTunnel *t)
2489 struct MeshPeerInfo *peer_info;
2490 struct MeshPeerQueue *pq;
2491 struct MeshPeerQueue *next;
2494 return; /* Was local peer, 0'ed in tunnel_destroy_iterator */
2495 peer_info = peer_get_short (neighbor);
2496 for (pq = peer_info->queue_head; NULL != pq; pq = next)
2499 if (pq->tunnel == t)
2501 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == pq->type ||
2502 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == pq->type)
2504 /* Should have been removed on destroy children */
2507 queue_destroy (pq, GNUNET_YES);
2510 if (NULL == peer_info->queue_head && NULL != peer_info->core_transmit)
2512 GNUNET_CORE_notify_transmit_ready_cancel(peer_info->core_transmit);
2513 peer_info->core_transmit = NULL;
2519 * Destroy the tunnel.
2521 * This function does not generate any warning traffic to clients or peers.
2524 * Remove the tunnel from peer_info's and clients' hashmaps.
2525 * Cancel messages belonging to this tunnel queued to neighbors.
2526 * Free any allocated resources linked to the tunnel.
2528 * @param t the tunnel to destroy
2530 * @return GNUNET_OK on success
2533 tunnel_destroy (struct MeshTunnel *t)
2535 struct MeshClient *c;
2536 struct GNUNET_HashCode hash;
2546 struct GNUNET_PeerIdentity id;
2548 GNUNET_PEER_resolve (t->id.oid, &id);
2549 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s [%x]\n",
2550 GNUNET_i2s (&id), t->id.tid);
2552 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
2556 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2557 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t))
2566 GNUNET_CONTAINER_multihashmap32_remove (c->own_tunnels, t->local_tid, t))
2573 if (NULL != t->client)
2577 GNUNET_CONTAINER_multihashmap32_remove (c->incoming_tunnels,
2578 t->local_tid_dest, t))
2584 GNUNET_CONTAINER_multihashmap32_remove (incoming_tunnels,
2585 t->local_tid_dest, t))
2592 if (0 != t->prev_hop)
2594 peer_cancel_queues (t->prev_hop, t);
2595 GNUNET_PEER_change_rc (t->prev_hop, -1);
2597 if (0 != t->next_hop)
2599 peer_cancel_queues (t->next_hop, t);
2600 GNUNET_PEER_change_rc (t->next_hop, -1);
2603 peer_info_remove_tunnel (peer_get_short (t->dest), t);
2606 if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
2607 GNUNET_SCHEDULER_cancel (t->maintenance_task);
2610 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
2611 path_destroy (t->path);
2617 * Tunnel is empty: destroy it.
2619 * Notifies all participants (peers, cleints) about the destruction.
2621 * @param t Tunnel to destroy.
2624 tunnel_destroy_empty (struct MeshTunnel *t)
2628 struct GNUNET_PeerIdentity id;
2630 GNUNET_PEER_resolve (t->id.oid, &id);
2631 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2632 "executing destruction of empty tunnel %s [%X]\n",
2633 GNUNET_i2s (&id), t->id.tid);
2637 if (GNUNET_NO == t->destroy)
2638 tunnel_send_destroy (t);
2639 if (0 == t->pending_messages)
2642 t->destroy = GNUNET_YES;
2646 * Initialize a Flow Control structure to the initial state.
2648 * @param fc Flow Control structure to initialize.
2651 fc_init (struct MeshFlowControl *fc)
2653 fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
2654 fc->last_pid_recv = (uint32_t) -1;
2655 fc->last_ack_sent = (uint32_t) -1; /* No traffic allowed yet */
2656 fc->last_ack_recv = (uint32_t) -1;
2657 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2658 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
2663 * Create a new tunnel
2665 * @param owner Who is the owner of the tunnel (short ID).
2666 * @param tid Tunnel Number of the tunnel.
2667 * @param client Clients that owns the tunnel, NULL for foreign tunnels.
2668 * @param local Tunnel Number for the tunnel, for the client point of view.
2670 * @return A new initialized tunnel. NULL on error.
2672 static struct MeshTunnel *
2673 tunnel_new (GNUNET_PEER_Id owner,
2674 MESH_TunnelNumber tid,
2675 struct MeshClient *client,
2676 MESH_TunnelNumber local)
2678 struct MeshTunnel *t;
2679 struct GNUNET_HashCode hash;
2681 if (n_tunnels >= max_tunnels && NULL == client)
2684 t = GNUNET_malloc (sizeof (struct MeshTunnel));
2687 t->queue_max = (max_msgs_queue / max_tunnels) + 1;
2689 fc_init (&t->next_fc);
2690 fc_init (&t->prev_fc);
2691 t->local_tid = local;
2693 GNUNET_STATISTICS_update (stats, "# tunnels", 1, GNUNET_NO);
2695 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2697 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
2698 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2705 GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR);
2713 GNUNET_CONTAINER_multihashmap32_put (client->own_tunnels,
2715 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2719 GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR);
2729 * Set options in a tunnel, extracted from a bit flag field
2731 * @param t Tunnel to set options to.
2732 * @param options Bit array in host byte order.
2735 tunnel_set_options (struct MeshTunnel *t, uint32_t options)
2737 t->nobuffer = (options & GNUNET_MESH_OPTION_NOBUFFER) != 0 ?
2738 GNUNET_YES : GNUNET_NO;
2739 t->reliable = (options & GNUNET_MESH_OPTION_RELIABLE) != 0 ?
2740 GNUNET_YES : GNUNET_NO;
2745 * Iterator for deleting each tunnel whose client endpoint disconnected.
2747 * @param cls Closure (client that has disconnected).
2748 * @param key The local tunnel id (used to access the hashmap).
2749 * @param value The value stored at the key (tunnel to destroy).
2751 * @return GNUNET_OK, keep iterating.
2754 tunnel_destroy_iterator (void *cls,
2758 struct MeshTunnel *t = value;
2759 struct MeshClient *c = cls;
2761 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2762 " Tunnel %X / %X destroy, due to client %u shutdown.\n",
2763 t->local_tid, t->local_tid_dest, c->id);
2764 client_delete_tunnel (c, t);
2767 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is destination.\n", c->id);
2769 if (0 != t->next_hop) { /* destroy could come before a path is used */
2770 GNUNET_PEER_change_rc (t->next_hop, -1);
2776 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is owner.\n", c->id);
2778 if (0 != t->prev_hop) { /* destroy could come before a path is used */
2779 GNUNET_PEER_change_rc (t->prev_hop, -1);
2784 tunnel_destroy_empty (t);
2791 * Timeout function, destroys tunnel if called
2793 * @param cls Closure (tunnel to destroy).
2794 * @param tc TaskContext
2797 tunnel_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2799 struct MeshTunnel *t = cls;
2800 struct GNUNET_PeerIdentity id;
2802 t->maintenance_task = GNUNET_SCHEDULER_NO_TASK;
2803 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2805 GNUNET_PEER_resolve(t->id.oid, &id);
2806 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2807 "Tunnel %s [%X] timed out. Destroying.\n",
2808 GNUNET_i2s(&id), t->id.tid);
2809 if (NULL != t->client)
2810 send_client_tunnel_destroy (t->client, t);
2811 tunnel_destroy (t); /* Do not notify other */
2816 * Resets the tunnel timeout. Starts it if no timeout was running.
2818 * @param t Tunnel whose timeout to reset.
2820 * TODO use heap to improve efficiency of scheduler.
2823 tunnel_reset_timeout (struct MeshTunnel *t)
2825 if (NULL != t->owner || 0 != t->local_tid || 0 == t->prev_hop)
2827 if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
2828 GNUNET_SCHEDULER_cancel (t->maintenance_task);
2829 t->maintenance_task =
2830 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
2831 (refresh_path_time, 4), &tunnel_timeout, t);
2835 /******************************************************************************/
2836 /**************** MESH NETWORK HANDLER HELPERS ***********************/
2837 /******************************************************************************/
2840 * Function to send a create path packet to a peer.
2842 * @param cls closure
2843 * @param size number of bytes available in buf
2844 * @param buf where the callee should write the message
2845 * @return number of bytes written to buf
2848 send_core_path_create (void *cls, size_t size, void *buf)
2850 struct MeshTunnel *t = cls;
2851 struct GNUNET_MESH_CreateTunnel *msg;
2852 struct GNUNET_PeerIdentity *peer_ptr;
2853 struct MeshPeerPath *p = t->path;
2858 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATE PATH sending...\n");
2860 sizeof (struct GNUNET_MESH_CreateTunnel) +
2861 p->length * sizeof (struct GNUNET_PeerIdentity);
2863 if (size < size_needed || NULL == buf)
2868 msg = (struct GNUNET_MESH_CreateTunnel *) buf;
2869 msg->header.size = htons (size_needed);
2870 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE);
2871 msg->tid = ntohl (t->id.tid);
2874 if (GNUNET_YES == t->nobuffer)
2875 opt |= GNUNET_MESH_OPTION_NOBUFFER;
2876 if (GNUNET_YES == t->reliable)
2877 opt |= GNUNET_MESH_OPTION_RELIABLE;
2878 msg->opt = htonl (opt);
2879 msg->port = htonl (t->port);
2881 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
2882 for (i = 0; i < p->length; i++)
2884 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
2887 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2888 "CREATE PATH (%u bytes long) sent!\n", size_needed);
2894 * Creates a path ack message in buf and frees all unused resources.
2896 * @param cls closure (MeshTransmissionDescriptor)
2897 * @param size number of bytes available in buf
2898 * @param buf where the callee should write the message
2899 * @return number of bytes written to buf
2902 send_core_path_ack (void *cls, size_t size, void *buf)
2904 struct MeshTunnel *t = cls;
2905 struct GNUNET_MESH_PathACK *msg = buf;
2907 GNUNET_assert (NULL != t);
2908 if (sizeof (struct GNUNET_MESH_PathACK) > size)
2913 t->prev_fc.last_ack_sent = t->nobuffer ? 0 : t->queue_max - 1;
2914 msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK));
2915 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
2916 GNUNET_PEER_resolve (t->id.oid, &msg->oid);
2917 msg->tid = htonl (t->id.tid);
2918 msg->peer_id = my_full_id;
2919 msg->ack = htonl (t->prev_fc.last_ack_sent);
2921 /* TODO add signature */
2923 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "PATH ACK sent!\n");
2924 return sizeof (struct GNUNET_MESH_PathACK);
2929 * Free a transmission that was already queued with all resources
2930 * associated to the request.
2932 * @param queue Queue handler to cancel.
2933 * @param clear_cls Is it necessary to free associated cls?
2936 queue_destroy (struct MeshPeerQueue *queue, int clear_cls)
2938 struct MeshFlowControl *fc;
2940 if (GNUNET_YES == clear_cls)
2942 switch (queue->type)
2944 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
2945 GNUNET_log (GNUNET_ERROR_TYPE_INFO, " cancelling TUNNEL_DESTROY\n");
2946 GNUNET_break (GNUNET_YES == queue->tunnel->destroy);
2948 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
2949 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
2950 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2951 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2952 case GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE:
2953 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2954 " prebuilt message\n");
2955 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2957 GNUNET_MESH_DEBUG_M2S (queue->type));
2959 case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
2960 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type create path\n");
2964 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2965 " type %s unknown!\n",
2966 GNUNET_MESH_DEBUG_M2S (queue->type));
2968 GNUNET_free_non_null (queue->cls);
2970 GNUNET_CONTAINER_DLL_remove (queue->peer->queue_head,
2971 queue->peer->queue_tail,
2974 /* Delete from appropriate fc in the tunnel */
2975 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == queue->type ||
2976 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == queue->type )
2978 if (queue->peer->id == queue->tunnel->prev_hop)
2979 fc = &queue->tunnel->prev_fc;
2980 else if (queue->peer->id == queue->tunnel->next_hop)
2981 fc = &queue->tunnel->next_fc;
2985 GNUNET_free (queue);
2990 GNUNET_free (queue);
2995 * @brief Get the next transmittable message from the queue.
2997 * This will be the head, except in the case of being a data packet
2998 * not allowed by the destination peer.
3000 * @param peer Destination peer.
3002 * @return The next viable MeshPeerQueue element to send to that peer.
3003 * NULL when there are no transmittable messages.
3005 struct MeshPeerQueue *
3006 queue_get_next (const struct MeshPeerInfo *peer)
3008 struct MeshPeerQueue *q;
3010 struct GNUNET_MESH_Data *dmsg;
3011 struct MeshTunnel* t;
3015 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* selecting message\n");
3016 for (q = peer->queue_head; NULL != q; q = q->next)
3019 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3021 GNUNET_MESH_DEBUG_M2S (q->type));
3022 dmsg = (struct GNUNET_MESH_Data *) q->cls;
3023 pid = ntohl (dmsg->pid);
3026 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3027 ack = t->next_fc.last_ack_recv;
3029 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3030 ack = t->prev_fc.last_ack_recv;
3033 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3037 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3038 "* ACK: %u, PID: %u\n",
3040 if (GNUNET_NO == GMC_is_pid_bigger (pid, ack))
3042 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3048 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3052 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3053 "* nothing found\n");
3059 queue_send (void *cls, size_t size, void *buf)
3061 struct MeshPeerInfo *peer = cls;
3062 struct GNUNET_MessageHeader *msg;
3063 struct MeshPeerQueue *queue;
3064 struct MeshTunnel *t;
3065 struct GNUNET_PeerIdentity dst_id;
3066 struct MeshFlowControl *fc;
3071 peer->core_transmit = NULL;
3073 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Queue send\n");
3074 queue = queue_get_next (peer);
3076 /* Queue has no internal mesh traffic nor sendable payload */
3079 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not ready, return\n");
3080 if (NULL == peer->queue_head)
3081 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
3084 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not empty\n");
3086 GNUNET_PEER_resolve (peer->id, &dst_id);
3087 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3089 GNUNET_i2s (&dst_id));
3090 /* Check if buffer size is enough for the message */
3091 if (queue->size > size)
3093 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3094 "* not enough room, reissue\n");
3095 peer->core_transmit =
3096 GNUNET_CORE_notify_transmit_ready (core_handle,
3099 GNUNET_TIME_UNIT_FOREVER_REL,
3106 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* size ok\n");
3109 GNUNET_assert (0 < t->pending_messages);
3110 t->pending_messages--;
3114 switch (queue->type)
3117 case GNUNET_MESSAGE_TYPE_MESH_ACK:
3118 case GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK:
3119 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK:
3120 case GNUNET_MESSAGE_TYPE_MESH_POLL:
3121 case GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN:
3122 case GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY:
3123 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
3124 case GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE:
3125 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3127 GNUNET_MESH_DEBUG_M2S (queue->type));
3129 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3130 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3131 data_size = send_core_data_raw (queue->cls, size, buf);
3132 msg = (struct GNUNET_MessageHeader *) buf;
3133 type = ntohs (msg->type);
3135 case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
3136 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path create\n");
3137 data_size = send_core_path_create (queue->cls, size, buf);
3139 case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
3140 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n");
3141 data_size = send_core_path_ack (queue->cls, size, buf);
3145 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3146 "* type unknown: %u\n",
3151 if (0 < drop_percent &&
3152 GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
3154 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3155 "Dropping message of type %s\n",
3156 GNUNET_MESH_DEBUG_M2S(queue->type));
3159 /* Free queue, but cls was freed by send_core_* */
3160 queue_destroy (queue, GNUNET_NO);
3162 /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
3163 pid = ((struct GNUNET_MESH_Data *) buf)->pid;
3167 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3168 t->next_fc.last_pid_sent = pid;
3169 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST);
3171 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3172 t->prev_fc.last_pid_sent = pid;
3173 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
3179 if (GNUNET_YES == t->destroy && 0 == t->pending_messages)
3181 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying tunnel!\n");
3185 /* If more data in queue, send next */
3186 queue = queue_get_next (peer);
3189 struct GNUNET_PeerIdentity id;
3191 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* more data!\n");
3192 GNUNET_PEER_resolve (peer->id, &id);
3193 peer->core_transmit =
3194 GNUNET_CORE_notify_transmit_ready(core_handle,
3197 GNUNET_TIME_UNIT_FOREVER_REL,
3203 else if (NULL != peer->queue_head)
3205 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3207 GNUNET_i2s (&my_full_id));
3208 if (peer->id == t->next_hop)
3210 else if (peer->id == t->prev_hop)
3217 if (NULL != fc && GNUNET_SCHEDULER_NO_TASK == fc->poll_task)
3220 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
3224 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Return %d\n", data_size);
3230 * @brief Queue and pass message to core when possible.
3232 * If type is payload (UNICAST, TO_ORIGIN) checks for queue status and
3233 * accounts for it. In case the queue is full, the message is dropped and
3236 * Otherwise, message is treated as internal and allowed to go regardless of
3239 * @param cls Closure (@c type dependant). It will be used by queue_send to
3240 * build the message to be sent if not already prebuilt.
3241 * @param type Type of the message, 0 for a raw message.
3242 * @param size Size of the message.
3243 * @param dst Neighbor to send message to.
3244 * @param t Tunnel this message belongs to.
3247 queue_add (void *cls, uint16_t type, size_t size,
3248 struct MeshPeerInfo *dst, struct MeshTunnel *t)
3250 struct MeshPeerQueue *queue;
3251 struct GNUNET_PeerIdentity id;
3252 struct MeshFlowControl *fc;
3256 priority = GNUNET_NO;
3257 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type)
3261 else if (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type)
3267 if (fc->queue_n >= t->queue_max)
3270 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3271 "queue full: %u/%u\n",
3272 fc->queue_n, t->queue_max);
3274 /* If this isn't a retransmission, drop the message */
3275 if (GNUNET_NO == t->reliable ||
3276 (NULL == t->owner && GNUNET_MESSAGE_TYPE_MESH_UNICAST == type) ||
3277 (NULL == t->client && GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type))
3279 GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)",
3281 return; /* Drop this message */
3283 priority = GNUNET_YES;
3287 queue = GNUNET_malloc (sizeof (struct MeshPeerQueue));
3293 if (GNUNET_YES == priority)
3294 GNUNET_CONTAINER_DLL_insert (dst->queue_head, dst->queue_tail, queue);
3296 GNUNET_CONTAINER_DLL_insert_tail (dst->queue_head, dst->queue_tail, queue);
3297 if (NULL == dst->core_transmit)
3299 GNUNET_PEER_resolve (dst->id, &id);
3300 dst->core_transmit =
3301 GNUNET_CORE_notify_transmit_ready (core_handle,
3304 GNUNET_TIME_UNIT_FOREVER_REL,
3310 t->pending_messages++;
3314 /******************************************************************************/
3315 /******************** MESH NETWORK HANDLERS **************************/
3316 /******************************************************************************/
3320 * Core handler for path creation
3322 * @param cls closure
3323 * @param message message
3324 * @param peer peer identity this notification is about
3326 * @return GNUNET_OK to keep the connection open,
3327 * GNUNET_SYSERR to close it (signal serious error)
3330 handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer,
3331 const struct GNUNET_MessageHeader *message)
3333 unsigned int own_pos;
3336 MESH_TunnelNumber tid;
3337 struct GNUNET_MESH_CreateTunnel *msg;
3338 struct GNUNET_PeerIdentity *pi;
3339 struct MeshPeerPath *path;
3340 struct MeshPeerInfo *dest_peer_info;
3341 struct MeshPeerInfo *orig_peer_info;
3342 struct MeshTunnel *t;
3344 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3345 "Received a path create msg [%s]\n",
3346 GNUNET_i2s (&my_full_id));
3347 size = ntohs (message->size);
3348 if (size < sizeof (struct GNUNET_MESH_CreateTunnel))
3350 GNUNET_break_op (0);
3354 size -= sizeof (struct GNUNET_MESH_CreateTunnel);
3355 if (size % sizeof (struct GNUNET_PeerIdentity))
3357 GNUNET_break_op (0);
3360 size /= sizeof (struct GNUNET_PeerIdentity);
3363 GNUNET_break_op (0);
3366 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
3367 msg = (struct GNUNET_MESH_CreateTunnel *) message;
3369 tid = ntohl (msg->tid);
3370 pi = (struct GNUNET_PeerIdentity *) &msg[1];
3371 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3372 " path is for tunnel %s[%X].\n", GNUNET_i2s (pi), tid);
3373 t = tunnel_get (pi, tid);
3374 if (NULL == t) /* might be a local tunnel */
3378 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating tunnel\n");
3379 t = tunnel_new (GNUNET_PEER_intern (pi), tid, NULL, 0);
3385 t->port = ntohl (msg->port);
3386 opt = ntohl (msg->opt);
3387 if (0 != (opt & GNUNET_MESH_OPTION_NOBUFFER))
3389 t->nobuffer = GNUNET_YES;
3392 if (0 != (opt & GNUNET_MESH_OPTION_RELIABLE))
3394 t->reliable = GNUNET_YES;
3396 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " nobuffer:%d\n", t->nobuffer);
3398 tunnel_reset_timeout (t);
3400 t->state = MESH_TUNNEL_WAITING;
3402 GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey);
3403 if (NULL == dest_peer_info)
3405 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3406 " Creating PeerInfo for destination.\n");
3407 dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
3408 dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]);
3409 GNUNET_CONTAINER_multihashmap_put (peers, &pi[size - 1].hashPubKey,
3411 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
3413 orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey);
3414 if (NULL == orig_peer_info)
3416 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3417 " Creating PeerInfo for origin.\n");
3418 orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
3419 orig_peer_info->id = GNUNET_PEER_intern (pi);
3420 GNUNET_CONTAINER_multihashmap_put (peers, &pi->hashPubKey, orig_peer_info,
3421 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
3423 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
3424 path = path_new (size);
3426 for (i = 0; i < size; i++)
3428 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n",
3429 GNUNET_i2s (&pi[i]));
3430 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
3431 if (path->peers[i] == myid)
3434 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
3435 if (own_pos == 0 && path->peers[own_pos] != myid)
3437 /* create path: self not found in path through self */
3438 GNUNET_break_op (0);
3439 path_destroy (path);
3443 path_add_to_peers (path, GNUNET_NO);
3444 tunnel_use_path (t, path);
3446 peer_info_add_tunnel (dest_peer_info, t);
3448 if (own_pos == size - 1)
3450 struct MeshClient *c;
3452 /* Find target client */
3453 c = GNUNET_CONTAINER_multihashmap32_get (ports, t->port);
3456 /* TODO send reject */
3460 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
3461 peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_YES);
3463 /* Assign local tid */
3464 while (NULL != tunnel_get_incoming (next_local_tid))
3465 next_local_tid = (next_local_tid + 1) | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
3466 t->local_tid_dest = next_local_tid++;
3467 next_local_tid = next_local_tid | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
3469 if (GNUNET_YES == t->reliable)
3471 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
3472 t->bck_rel = GNUNET_malloc (sizeof (struct MeshTunnelReliability));
3474 t->bck_rel->expected_delay = MESH_RETRANSMIT_TIME;
3477 tunnel_add_client (t, c);
3478 send_client_tunnel_create (t);
3483 struct MeshPeerPath *path2;
3485 t->next_hop = path->peers[own_pos + 1];
3486 GNUNET_PEER_change_rc(t->next_hop, 1);
3488 /* It's for somebody else! Retransmit. */
3489 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
3490 path2 = path_duplicate (path);
3491 peer_info_add_path (dest_peer_info, path2, GNUNET_NO);
3492 peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_NO);
3493 send_create_path (t);
3501 * Core handler for path ACKs
3503 * @param cls closure
3504 * @param message message
3505 * @param peer peer identity this notification is about
3507 * @return GNUNET_OK to keep the connection open,
3508 * GNUNET_SYSERR to close it (signal serious error)
3511 handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
3512 const struct GNUNET_MessageHeader *message)
3514 struct GNUNET_MESH_PathACK *msg;
3515 struct MeshPeerInfo *peer_info;
3516 struct MeshPeerPath *p;
3517 struct MeshTunnel *t;
3519 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a path ACK msg [%s]\n",
3520 GNUNET_i2s (&my_full_id));
3521 msg = (struct GNUNET_MESH_PathACK *) message;
3522 t = tunnel_get (&msg->oid, ntohl(msg->tid));
3525 /* TODO notify that we don't know the tunnel */
3526 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel", 1, GNUNET_NO);
3527 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't know the tunnel %s [%X]!\n",
3528 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3531 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %s [%X]\n",
3532 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3534 peer_info = peer_get (&msg->peer_id);
3535 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by peer %s\n",
3536 GNUNET_i2s (&msg->peer_id));
3537 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n",
3540 /* Add path to peers? */
3544 path_add_to_peers (p, GNUNET_YES);
3550 t->state = MESH_TUNNEL_READY;
3551 t->next_fc.last_ack_recv = (NULL == t->client) ? ntohl (msg->ack) : 0;
3552 t->prev_fc.last_ack_sent = ntohl (msg->ack);
3554 /* Message for us? */
3555 if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity)))
3557 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
3558 if (NULL == t->owner)
3560 GNUNET_break_op (0);
3563 if (NULL != peer_info->dhtget)
3565 GNUNET_DHT_get_stop (peer_info->dhtget);
3566 peer_info->dhtget = NULL;
3568 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
3569 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
3573 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3574 " not for us, retransmitting...\n");
3575 peer_info = peer_get (&msg->oid);
3576 send_prebuilt_message (message, t->prev_hop, t);
3582 * Core handler for notifications of broken paths
3584 * @param cls closure
3585 * @param message message
3586 * @param peer peer identity this notification is about
3588 * @return GNUNET_OK to keep the connection open,
3589 * GNUNET_SYSERR to close it (signal serious error)
3592 handle_mesh_path_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
3593 const struct GNUNET_MessageHeader *message)
3595 struct GNUNET_MESH_PathBroken *msg;
3596 struct MeshTunnel *t;
3598 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3599 "Received a PATH BROKEN msg from %s\n", GNUNET_i2s (peer));
3600 msg = (struct GNUNET_MESH_PathBroken *) message;
3601 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
3602 GNUNET_i2s (&msg->peer1));
3603 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
3604 GNUNET_i2s (&msg->peer2));
3605 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3608 GNUNET_break_op (0);
3611 tunnel_notify_connection_broken (t, GNUNET_PEER_search (&msg->peer1),
3612 GNUNET_PEER_search (&msg->peer2));
3619 * Core handler for tunnel destruction
3621 * @param cls closure
3622 * @param message message
3623 * @param peer peer identity this notification is about
3625 * @return GNUNET_OK to keep the connection open,
3626 * GNUNET_SYSERR to close it (signal serious error)
3629 handle_mesh_tunnel_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
3630 const struct GNUNET_MessageHeader *message)
3632 struct GNUNET_MESH_TunnelDestroy *msg;
3633 struct MeshTunnel *t;
3635 msg = (struct GNUNET_MESH_TunnelDestroy *) message;
3636 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3637 "Got a TUNNEL DESTROY packet from %s\n",
3639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3640 " for tunnel %s [%u]\n",
3641 GNUNET_i2s (&msg->oid), ntohl (msg->tid));
3642 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3645 /* Probably already got the message from another path,
3646 * destroyed the tunnel and retransmitted to children.
3649 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel",
3653 if (t->local_tid_dest >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
3655 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "INCOMING TUNNEL %X %X\n",
3656 t->local_tid, t->local_tid_dest);
3658 if (GNUNET_PEER_search (peer) == t->prev_hop)
3660 // TODO check owner's signature
3661 // TODO add owner's signatue to tunnel for retransmission
3662 peer_cancel_queues (t->prev_hop, t);
3663 GNUNET_PEER_change_rc (t->prev_hop, -1);
3666 else if (GNUNET_PEER_search (peer) == t->next_hop)
3668 // TODO check dest's signature
3669 // TODO add dest's signatue to tunnel for retransmission
3670 peer_cancel_queues (t->next_hop, t);
3671 GNUNET_PEER_change_rc (t->next_hop, -1);
3676 GNUNET_break_op (0);
3677 // TODO check both owner AND destination's signature to see which matches
3678 // TODO restransmit in appropriate direction
3681 tunnel_destroy_empty (t);
3683 // TODO: add timeout to destroy the tunnel anyway
3689 * Core handler for mesh network traffic going from the origin to a peer
3691 * @param cls closure
3692 * @param peer peer identity this notification is about
3693 * @param message message
3694 * @return GNUNET_OK to keep the connection open,
3695 * GNUNET_SYSERR to close it (signal serious error)
3698 handle_mesh_unicast (void *cls, const struct GNUNET_PeerIdentity *peer,
3699 const struct GNUNET_MessageHeader *message)
3701 struct GNUNET_MESH_Data *msg;
3702 struct MeshTunnel *t;
3707 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a unicast packet from %s\n",
3710 size = ntohs (message->size);
3712 sizeof (struct GNUNET_MESH_Data) +
3713 sizeof (struct GNUNET_MessageHeader))
3718 msg = (struct GNUNET_MESH_Data *) message;
3719 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " of type %s\n",
3720 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
3722 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3725 /* TODO notify back: we don't know this tunnel */
3726 GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO);
3727 GNUNET_break_op (0);
3730 pid = ntohl (msg->pid);
3731 if (GMC_is_pid_bigger (pid, t->prev_fc.last_ack_sent))
3733 GNUNET_STATISTICS_update (stats, "# unsolicited unicast", 1, GNUNET_NO);
3734 GNUNET_break_op (0);
3735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3736 "Received PID %u, ACK %u\n",
3737 pid, t->prev_fc.last_ack_sent);
3738 tunnel_send_fwd_ack(t, GNUNET_MESSAGE_TYPE_MESH_POLL);
3742 tunnel_reset_timeout (t);
3743 if (t->dest == myid)
3745 /* TODO signature verification */
3746 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3747 " it's for us! sending to clients...\n");
3748 GNUNET_STATISTICS_update (stats, "# unicast received", 1, GNUNET_NO);
3749 // if (GMC_is_pid_bigger(pid, t->prev_fc.last_pid_recv)) FIXME use
3750 if (GMC_is_pid_bigger (pid, t->prev_fc.last_pid_recv)
3752 (GNUNET_NO == t->reliable ||
3753 GNUNET_ntohll (msg->mid) == (t->bck_rel->mid_recv + 1)) )
3755 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3756 " pid %u not seen yet, forwarding\n", pid);
3757 t->prev_fc.last_pid_recv = pid;
3758 t->bck_rel->mid_recv++;
3759 tunnel_send_client_ucast (t, msg);
3763 // GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO);
3764 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3765 " Pid %u not expected (%u), sending FWD ACK!\n",
3766 pid, t->prev_fc.last_pid_recv + 1);
3768 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST);
3771 if (GMC_is_pid_bigger(pid, t->prev_fc.last_pid_recv))
3772 t->prev_fc.last_pid_recv = pid;
3773 if (0 == t->next_hop)
3778 ttl = ntohl (msg->ttl);
3779 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
3782 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
3783 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
3784 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
3787 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3788 " not for us, retransmitting...\n");
3790 send_prebuilt_message (message, t->next_hop, t);
3791 GNUNET_STATISTICS_update (stats, "# unicast forwarded", 1, GNUNET_NO);
3797 * Core handler for mesh network traffic toward the owner of a tunnel
3799 * @param cls closure
3800 * @param message message
3801 * @param peer peer identity this notification is about
3803 * @return GNUNET_OK to keep the connection open,
3804 * GNUNET_SYSERR to close it (signal serious error)
3807 handle_mesh_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
3808 const struct GNUNET_MessageHeader *message)
3810 struct GNUNET_MESH_Data *msg;
3811 struct MeshTunnel *t;
3816 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a ToOrigin packet from %s\n",
3818 size = ntohs (message->size);
3819 if (size < sizeof (struct GNUNET_MESH_Data) + /* Payload must be */
3820 sizeof (struct GNUNET_MessageHeader)) /* at least a header */
3822 GNUNET_break_op (0);
3825 msg = (struct GNUNET_MESH_Data *) message;
3826 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " of type %s\n",
3827 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
3828 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3829 pid = ntohl (msg->pid);
3832 /* TODO notify that we dont know this tunnel (whom)? */
3833 GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO);
3834 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3835 "Received to_origin with PID %u on unknown tunnel %s [%u]\n",
3836 pid, GNUNET_i2s (&msg->oid), ntohl (msg->tid));
3840 if (GMC_is_pid_bigger (pid, t->next_fc.last_ack_sent))
3842 GNUNET_STATISTICS_update (stats, "# unsolicited to_orig", 1, GNUNET_NO);
3843 GNUNET_break_op (0);
3844 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3845 "Received PID %u, ACK %u\n",
3846 pid, t->next_fc.last_ack_sent);
3847 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
3851 if (myid == t->id.oid)
3853 /* TODO signature verification */
3854 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3855 " it's for us! sending to clients...\n");
3856 GNUNET_STATISTICS_update (stats, "# to origin received", 1, GNUNET_NO);
3857 if ( (GNUNET_NO == t->reliable &&
3858 GMC_is_pid_bigger(pid, t->next_fc.last_pid_recv))
3860 (GNUNET_YES == t->reliable &&
3861 pid == t->next_fc.last_pid_recv + 1) ) // FIXME use "futures" as accepting
3863 t->next_fc.last_pid_recv = pid;
3864 tunnel_send_client_to_orig (t, msg);
3868 // GNUNET_STATISTICS_update (stats, "# duplicate PID drops BCK", 1, GNUNET_NO);
3869 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3870 " Pid %u not expected, sending FWD ACK!\n", pid);
3872 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
3875 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3876 " not for us, retransmitting...\n");
3877 if (GMC_is_pid_bigger (pid, t->next_fc.last_pid_recv))
3878 t->next_fc.last_pid_recv = pid;
3879 if (0 == t->prev_hop) /* No owner AND no prev hop */
3881 if (GNUNET_YES == t->destroy)
3883 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3884 "to orig received on a dying tunnel %s [%X]\n",
3885 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3888 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3889 "unknown to origin at %s\n",
3890 GNUNET_i2s (&my_full_id));
3891 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3894 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3895 "on tunnel %s [%X]\n",
3896 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3899 ttl = ntohl (msg->ttl);
3900 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
3903 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
3904 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
3905 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
3908 send_prebuilt_message (message, t->prev_hop, t);
3909 GNUNET_STATISTICS_update (stats, "# to origin forwarded", 1, GNUNET_NO);
3916 * Core handler for mesh network traffic end-to-end ACKs.
3918 * @param cls Closure.
3919 * @param message Message.
3920 * @param peer Peer identity this notification is about.
3922 * @return GNUNET_OK to keep the connection open,
3923 * GNUNET_SYSERR to close it (signal serious error)
3926 handle_mesh_data_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
3927 const struct GNUNET_MessageHeader *message)
3929 struct GNUNET_MESH_DataACK *msg;
3930 struct MeshTunnelReliability *rel;
3931 struct MeshReliableMessage *copy;
3932 struct MeshReliableMessage *next;
3933 struct MeshTunnel *t;
3939 type = ntohs (message->type);
3940 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a %s message from %s!\n",
3941 GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer));
3942 msg = (struct GNUNET_MESH_DataACK *) message;
3944 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3947 /* TODO notify that we dont know this tunnel (whom)? */
3948 GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO);
3951 ack = GNUNET_ntohll (msg->mid);
3952 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %llu\n", ack);
3954 /* Is this a forward or backward ACK? */
3955 id = GNUNET_PEER_search (peer);
3956 if (t->next_hop == id && GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK == type)
3958 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
3959 if (NULL == t->owner)
3961 send_prebuilt_message (message, t->prev_hop, t);
3965 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST);
3967 else if (t->prev_hop == id && GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK == type)
3969 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
3970 if (NULL == t->client)
3972 send_prebuilt_message (message, t->next_hop, t);
3976 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
3980 GNUNET_break_op (0);
3984 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! ACK %llu\n", ack);
3985 for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next)
3987 struct GNUNET_TIME_Relative time;
3989 if (copy->mid > ack)
3991 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! head %llu, out!\n", copy->mid);
3995 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! id %llu\n", copy->mid);
3997 time = GNUNET_TIME_absolute_get_duration (copy->timestamp);
3998 rel->expected_delay.rel_value += time.rel_value;
3999 rel->expected_delay.rel_value /= 2;
4001 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! new expected delay %s\n",
4002 GNUNET_STRINGS_relative_time_to_string (rel->expected_delay,
4004 rel->retry_timer = rel->expected_delay;
4005 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
4009 if (GNUNET_YES == work)
4011 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
4013 GNUNET_SCHEDULER_cancel (rel->retry_task);
4014 if (NULL == rel->head_sent)
4016 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
4020 struct GNUNET_TIME_Absolute new_target;
4021 struct GNUNET_TIME_Relative delay;
4023 new_target = GNUNET_TIME_absolute_add (rel->head_sent->timestamp,
4025 delay = GNUNET_TIME_absolute_get_remaining (new_target);
4027 GNUNET_SCHEDULER_add_delayed (delay,
4028 &tunnel_retransmit_message,
4039 * Core handler for mesh network traffic point-to-point acks.
4041 * @param cls closure
4042 * @param message message
4043 * @param peer peer identity this notification is about
4045 * @return GNUNET_OK to keep the connection open,
4046 * GNUNET_SYSERR to close it (signal serious error)
4049 handle_mesh_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
4050 const struct GNUNET_MessageHeader *message)
4052 struct GNUNET_MESH_ACK *msg;
4053 struct MeshTunnel *t;
4054 struct MeshFlowControl *fc;
4058 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
4060 msg = (struct GNUNET_MESH_ACK *) message;
4062 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4066 /* TODO notify that we dont know this tunnel (whom)? */
4067 GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO);
4070 ack = ntohl (msg->pid);
4071 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
4073 /* Is this a forward or backward ACK? */
4074 id = GNUNET_PEER_search (peer);
4075 if (t->next_hop == id)
4078 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
4081 else if (t->prev_hop == id)
4084 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
4089 GNUNET_break_op (0);
4093 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task &&
4094 GMC_is_pid_bigger (ack, fc->last_ack_recv))
4096 GNUNET_SCHEDULER_cancel (fc->poll_task);
4097 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
4098 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
4100 fc->last_ack_recv = ack;
4101 peer_unlock_queue (id);
4103 if (t->next_hop == id)
4104 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
4106 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
4113 * Core handler for mesh network traffic point-to-point ack polls.
4115 * @param cls closure
4116 * @param message message
4117 * @param peer peer identity this notification is about
4119 * @return GNUNET_OK to keep the connection open,
4120 * GNUNET_SYSERR to close it (signal serious error)
4123 handle_mesh_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
4124 const struct GNUNET_MessageHeader *message)
4126 struct GNUNET_MESH_Poll *msg;
4127 struct MeshTunnel *t;
4128 struct MeshFlowControl *fc;
4133 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an POLL packet from %s!\n",
4136 msg = (struct GNUNET_MESH_Poll *) message;
4138 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4142 /* TODO notify that we dont know this tunnel (whom)? */
4143 GNUNET_STATISTICS_update (stats, "# poll on unknown tunnel", 1, GNUNET_NO);
4144 GNUNET_break_op (0);
4148 /* Is this a forward or backward ACK? */
4149 id = GNUNET_PEER_search(peer);
4150 pid = ntohl (msg->pid);
4151 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PID %u\n", pid);
4152 if (t->next_hop == id)
4154 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from FWD\n");
4155 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " was %u\n", t->next_fc.last_pid_recv);
4157 old = fc->last_pid_recv;
4158 fc->last_pid_recv = pid;
4159 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
4161 else if (t->prev_hop == id)
4163 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from BCK\n");
4164 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " was %u\n", t->prev_fc.last_pid_recv);
4166 old = fc->last_pid_recv;
4167 fc->last_pid_recv = pid;
4168 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
4173 if (GNUNET_YES == t->reliable)
4174 fc->last_pid_recv = old;
4181 * Core handler for mesh keepalives.
4183 * @param cls closure
4184 * @param message message
4185 * @param peer peer identity this notification is about
4186 * @return GNUNET_OK to keep the connection open,
4187 * GNUNET_SYSERR to close it (signal serious error)
4189 * TODO: Check who we got this from, to validate route.
4192 handle_mesh_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
4193 const struct GNUNET_MessageHeader *message)
4195 struct GNUNET_MESH_TunnelKeepAlive *msg;
4196 struct MeshTunnel *t;
4198 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
4201 msg = (struct GNUNET_MESH_TunnelKeepAlive *) message;
4202 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4206 /* TODO notify that we dont know that tunnel */
4207 GNUNET_STATISTICS_update (stats, "# keepalive on unknown tunnel", 1,
4212 tunnel_reset_timeout (t);
4213 if (NULL != t->client || 0 == t->next_hop || myid == t->next_hop)
4216 GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
4217 send_prebuilt_message (message, t->next_hop, t);
4224 * Functions to handle messages from core
4226 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
4227 {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0},
4228 {&handle_mesh_path_broken, GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN,
4229 sizeof (struct GNUNET_MESH_PathBroken)},
4230 {&handle_mesh_tunnel_destroy, GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY,
4231 sizeof (struct GNUNET_MESH_TunnelDestroy)},
4232 {&handle_mesh_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
4233 {&handle_mesh_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
4234 {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK,
4235 sizeof (struct GNUNET_MESH_DataACK)},
4236 {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK,
4237 sizeof (struct GNUNET_MESH_DataACK)},
4238 {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE,
4239 sizeof (struct GNUNET_MESH_TunnelKeepAlive)},
4240 {&handle_mesh_ack, GNUNET_MESSAGE_TYPE_MESH_ACK,
4241 sizeof (struct GNUNET_MESH_ACK)},
4242 {&handle_mesh_poll, GNUNET_MESSAGE_TYPE_MESH_POLL,
4243 sizeof (struct GNUNET_MESH_Poll)},
4244 {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
4245 sizeof (struct GNUNET_MESH_PathACK)},
4251 /******************************************************************************/
4252 /**************** MESH LOCAL HANDLER HELPERS ***********************/
4253 /******************************************************************************/
4258 * notify_client_connection_failure: notify a client that the connection to the
4259 * requested remote peer is not possible (for instance, no route found)
4260 * Function called when the socket is ready to queue more data. "buf" will be
4261 * NULL and "size" zero if the socket was closed for writing in the meantime.
4263 * @param cls closure
4264 * @param size number of bytes available in buf
4265 * @param buf where the callee should write the message
4266 * @return number of bytes written to buf
4269 notify_client_connection_failure (void *cls, size_t size, void *buf)
4272 struct MeshPeerInfo *peer_info;
4273 struct GNUNET_MESH_PeerControl *msg;
4274 struct GNUNET_PeerIdentity id;
4276 if (0 == size && NULL == buf)
4278 // TODO retry? cancel?
4282 size_needed = sizeof (struct GNUNET_MESH_PeerControl);
4283 peer_info = (struct MeshPeerInfo *) cls;
4284 msg = (struct GNUNET_MESH_PeerControl *) buf;
4285 msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
4286 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED);
4287 // msg->tunnel_id = htonl(peer_info->t->tid);
4288 GNUNET_PEER_resolve (peer_info->id, &id);
4289 memcpy (&msg->peer, &id, sizeof (struct GNUNET_PeerIdentity));
4297 * Send keepalive packets for a tunnel.
4299 * @param cls Closure (tunnel for which to send the keepalive).
4300 * @param tc Notification context.
4302 * FIXME: add a refresh reset in case of normal unicast traffic is doing the job
4305 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4307 struct MeshTunnel *t = cls;
4308 struct GNUNET_MESH_TunnelKeepAlive *msg;
4309 size_t size = sizeof (struct GNUNET_MESH_TunnelKeepAlive);
4312 t->maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4313 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) ||
4314 NULL == t->owner || 0 == t->local_tid)
4319 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4320 "sending keepalive for tunnel %d\n", t->id.tid);
4322 msg = (struct GNUNET_MESH_TunnelKeepAlive *) cbuf;
4323 msg->header.size = htons (size);
4324 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE);
4325 msg->oid = my_full_id;
4326 msg->tid = htonl (t->id.tid);
4327 send_prebuilt_message (&msg->header, t->next_hop, t);
4329 t->maintenance_task =
4330 GNUNET_SCHEDULER_add_delayed (refresh_path_time, &path_refresh, t);
4335 * Function to process paths received for a new peer addition. The recorded
4336 * paths form the initial tunnel, which can be optimized later.
4337 * Called on each result obtained for the DHT search.
4339 * @param cls closure
4340 * @param exp when will this value expire
4341 * @param key key of the result
4342 * @param get_path path of the get request
4343 * @param get_path_length lenght of get_path
4344 * @param put_path path of the put request
4345 * @param put_path_length length of the put_path
4346 * @param type type of the result
4347 * @param size number of bytes in data
4348 * @param data pointer to the result data
4351 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
4352 const struct GNUNET_HashCode * key,
4353 const struct GNUNET_PeerIdentity *get_path,
4354 unsigned int get_path_length,
4355 const struct GNUNET_PeerIdentity *put_path,
4356 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
4357 size_t size, const void *data)
4359 struct MeshPeerInfo *peer = cls;
4360 struct MeshPeerPath *p;
4361 struct GNUNET_PeerIdentity pi;
4364 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got results from DHT!\n");
4365 GNUNET_PEER_resolve (peer->id, &pi);
4366 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&pi));
4368 p = path_build_from_dht (get_path, get_path_length,
4369 put_path, put_path_length);
4370 path_add_to_peers (p, GNUNET_NO);
4372 for (i = 0; i < peer->ntunnels; i++)
4374 struct GNUNET_PeerIdentity id;
4376 GNUNET_PEER_resolve (peer->tunnels[i]->id.oid, &id);
4377 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... tunnel %s:%X (%X / %X)\n",
4378 GNUNET_i2s (&id), peer->tunnels[i]->id.tid,
4379 peer->tunnels[i]->local_tid,
4380 peer->tunnels[i]->local_tid_dest);
4381 if (peer->tunnels[i]->state == MESH_TUNNEL_SEARCHING)
4383 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
4384 peer_connect (peer, peer->tunnels[i]);
4392 /******************************************************************************/
4393 /********************* MESH LOCAL HANDLES **************************/
4394 /******************************************************************************/
4398 * Handler for client connection.
4400 * @param cls Closure (unused).
4401 * @param client Client handler.
4404 handle_local_client_connect (void *cls, struct GNUNET_SERVER_Client *client)
4406 struct MeshClient *c;
4408 c = GNUNET_malloc (sizeof (struct MeshClient));
4410 GNUNET_SERVER_client_keep (client);
4411 GNUNET_SERVER_client_set_user_context (client, c);
4416 * Handler for client disconnection
4418 * @param cls closure
4419 * @param client identification of the client; NULL
4420 * for the last call when the server is destroyed
4423 handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
4425 struct MeshClient *c;
4426 struct MeshClient *next;
4428 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected: %p\n", client);
4431 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (SERVER DOWN)\n");
4435 c = client_get (client);
4438 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "matching client found (%u)\n",
4440 GNUNET_SERVER_client_drop (c->handle);
4441 c->shutting_down = GNUNET_YES;
4442 GNUNET_CONTAINER_multihashmap32_iterate (c->own_tunnels,
4443 &tunnel_destroy_iterator, c);
4444 GNUNET_CONTAINER_multihashmap32_iterate (c->incoming_tunnels,
4445 &tunnel_destroy_iterator, c);
4446 GNUNET_CONTAINER_multihashmap32_destroy (c->own_tunnels);
4447 GNUNET_CONTAINER_multihashmap32_destroy (c->incoming_tunnels);
4449 if (NULL != c->ports)
4450 GNUNET_CONTAINER_multihashmap32_destroy (c->ports);
4452 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, c);
4453 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " CLIENT FREE at %p\n", c);
4455 GNUNET_STATISTICS_update (stats, "# clients", -1, GNUNET_NO);
4460 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " context NULL!\n");
4462 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "done!\n");
4468 * Handler for new clients
4470 * @param cls closure
4471 * @param client identification of the client
4472 * @param message the actual message, which includes messages the client wants
4475 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
4476 const struct GNUNET_MessageHeader *message)
4478 struct GNUNET_MESH_ClientConnect *cc_msg;
4479 struct MeshClient *c;
4484 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client connected %p\n", client);
4486 /* Check data sanity */
4487 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
4488 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
4489 if (0 != (size % sizeof (uint32_t)))
4492 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4495 size /= sizeof (uint32_t);
4497 /* Initialize new client structure */
4498 c = GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
4499 c->id = next_client_id++; /* overflow not important: just for debug */
4500 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client id %u\n", c->id);
4501 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client has %u ports\n", size);
4506 p = (uint32_t *) &cc_msg[1];
4507 c->ports = GNUNET_CONTAINER_multihashmap32_create (size);
4508 for (i = 0; i < size; i++)
4511 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port: %u\n", u32);
4513 /* store in client's hashmap */
4514 GNUNET_CONTAINER_multihashmap32_put (c->ports, u32, c,
4515 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
4516 /* store in global hashmap */
4517 /* FIXME only allow one client to have the port open,
4518 * have a backup hashmap with waiting clients */
4519 GNUNET_CONTAINER_multihashmap32_put (ports, u32, c,
4520 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
4524 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, c);
4525 c->own_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
4526 c->incoming_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
4527 GNUNET_SERVER_notification_context_add (nc, client);
4528 GNUNET_STATISTICS_update (stats, "# clients", 1, GNUNET_NO);
4530 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4531 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client processed\n");
4536 * Handler for requests of new tunnels
4538 * @param cls Closure.
4539 * @param client Identification of the client.
4540 * @param message The actual message.
4543 handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client,
4544 const struct GNUNET_MessageHeader *message)
4546 struct GNUNET_MESH_TunnelMessage *t_msg;
4547 struct MeshPeerInfo *peer_info;
4548 struct MeshTunnel *t;
4549 struct MeshClient *c;
4550 MESH_TunnelNumber tid;
4552 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new tunnel requested\n");
4554 /* Sanity check for client registration */
4555 if (NULL == (c = client_get (client)))
4558 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4561 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4563 /* Message size sanity check */
4564 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
4567 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4571 t_msg = (struct GNUNET_MESH_TunnelMessage *) message;
4572 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n",
4573 GNUNET_i2s (&t_msg->peer));
4574 /* Sanity check for tunnel numbering */
4575 tid = ntohl (t_msg->tunnel_id);
4576 if (0 == (tid & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI))
4579 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4582 /* Sanity check for duplicate tunnel IDs */
4583 if (NULL != tunnel_get_by_local_id (c, tid))
4586 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4591 while (NULL != tunnel_get_by_pi (myid, next_tid))
4592 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
4593 t = tunnel_new (myid, next_tid, c, tid);
4594 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
4598 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4601 t->port = ntohl (t_msg->port);
4602 tunnel_set_options (t, ntohl (t_msg->options));
4603 if (GNUNET_YES == t->reliable)
4605 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
4606 t->fwd_rel = GNUNET_malloc (sizeof (struct MeshTunnelReliability));
4608 t->fwd_rel->expected_delay = MESH_RETRANSMIT_TIME;
4611 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATED TUNNEL %s[%x]:%u (%x)\n",
4612 GNUNET_i2s (&my_full_id), t->id.tid, t->port, t->local_tid);
4614 peer_info = peer_get (&t_msg->peer);
4615 peer_info_add_tunnel (peer_info, t);
4616 peer_connect (peer_info, t);
4617 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4623 * Handler for requests of deleting tunnels
4625 * @param cls closure
4626 * @param client identification of the client
4627 * @param message the actual message
4630 handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
4631 const struct GNUNET_MessageHeader *message)
4633 struct GNUNET_MESH_TunnelMessage *tunnel_msg;
4634 struct MeshClient *c;
4635 struct MeshTunnel *t;
4636 MESH_TunnelNumber tid;
4638 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4639 "Got a DESTROY TUNNEL from client!\n");
4641 /* Sanity check for client registration */
4642 if (NULL == (c = client_get (client)))
4645 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4648 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4650 /* Message sanity check */
4651 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
4654 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4658 tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message;
4660 /* Retrieve tunnel */
4661 tid = ntohl (tunnel_msg->tunnel_id);
4662 t = tunnel_get_by_local_id(c, tid);
4665 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " tunnel %X not found\n", tid);
4667 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4671 /* Cleanup after the tunnel */
4672 client_delete_tunnel (c, t);
4679 peer_info_remove_tunnel (peer_get_short (t->dest), t);
4683 /* The tunnel will be destroyed when the last message is transmitted. */
4684 tunnel_destroy_empty (t);
4686 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4692 * Handler for client traffic
4694 * @param cls closure
4695 * @param client identification of the client
4696 * @param message the actual message
4699 handle_local_data (void *cls, struct GNUNET_SERVER_Client *client,
4700 const struct GNUNET_MessageHeader *message)
4702 struct GNUNET_MESH_LocalData *data_msg;
4703 struct MeshClient *c;
4704 struct MeshTunnel *t;
4705 struct MeshFlowControl *fc;
4706 MESH_TunnelNumber tid;
4709 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4710 "Got data from a client!\n");
4712 /* Sanity check for client registration */
4713 if (NULL == (c = client_get (client)))
4716 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4719 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4721 data_msg = (struct GNUNET_MESH_LocalData *) message;
4723 /* Sanity check for message size */
4724 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_LocalData);
4725 if (size < sizeof (struct GNUNET_MessageHeader))
4728 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4732 /* Tunnel exists? */
4733 tid = ntohl (data_msg->tid);
4734 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI)
4737 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4740 t = tunnel_get_by_local_id (c, tid);
4744 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4748 /* Is the client in the tunnel? */
4749 if ( !( (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV &&
4751 t->owner->handle == client)
4753 (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV &&
4755 t->client->handle == client) ) )
4758 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4762 /* Ok, everything is correct, send the message
4763 * (pretend we got it from a mesh peer)
4766 struct GNUNET_MESH_Data *payload;
4767 char cbuf[sizeof(struct GNUNET_MESH_Data) + size];
4769 fc = tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV ? &t->prev_fc : &t->next_fc;
4770 if (GNUNET_YES == t->reliable)
4772 struct MeshTunnelReliability *rel;
4773 struct MeshReliableMessage *copy;
4775 rel = (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) ? t->fwd_rel : t->bck_rel;
4776 copy = GNUNET_malloc (sizeof (struct MeshReliableMessage)
4777 + sizeof(struct GNUNET_MESH_Data)
4779 copy->mid = rel->mid_sent++;
4780 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! DATA %llu\n", copy->mid);
4781 copy->timestamp = GNUNET_TIME_absolute_get ();
4784 GNUNET_CONTAINER_DLL_insert_tail (rel->head_sent, rel->tail_sent, copy);
4785 if (GNUNET_SCHEDULER_NO_TASK == rel->retry_task)
4788 GNUNET_TIME_relative_multiply (rel->expected_delay,
4789 MESH_RETRANSMIT_MARGIN);
4791 GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
4792 &tunnel_retransmit_message,
4795 payload = (struct GNUNET_MESH_Data *) ©[1];
4796 payload->mid = GNUNET_htonll (copy->mid);
4800 payload = (struct GNUNET_MESH_Data *) cbuf;
4802 // FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
4803 // use different struct for unreliable traffic, save 8 bytes
4805 memcpy (&payload[1], &data_msg[1], size);
4806 payload->header.size = htons (sizeof (struct GNUNET_MESH_Data) + size);
4807 payload->header.type = htons (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV ?
4808 GNUNET_MESSAGE_TYPE_MESH_UNICAST :
4809 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
4810 GNUNET_PEER_resolve(t->id.oid, &payload->oid);;
4811 payload->tid = htonl (t->id.tid);
4812 payload->ttl = htonl (default_ttl);
4813 payload->pid = htonl (fc->last_pid_recv + 1);
4814 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4815 " calling generic handler...\n");
4816 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
4817 handle_mesh_unicast (NULL, &my_full_id, &payload->header);
4819 handle_mesh_to_orig (NULL, &my_full_id, &payload->header);
4821 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "receive done OK\n");
4822 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4829 * Handler for client's ACKs for payload traffic.
4831 * @param cls Closure (unused).
4832 * @param client Identification of the client.
4833 * @param message The actual message.
4836 handle_local_ack (void *cls, struct GNUNET_SERVER_Client *client,
4837 const struct GNUNET_MessageHeader *message)
4839 struct GNUNET_MESH_LocalAck *msg;
4840 struct MeshTunnel *t;
4841 struct MeshClient *c;
4842 MESH_TunnelNumber tid;
4844 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a local ACK\n");
4845 /* Sanity check for client registration */
4846 if (NULL == (c = client_get (client)))
4849 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4852 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4854 msg = (struct GNUNET_MESH_LocalAck *) message;
4856 /* Tunnel exists? */
4857 tid = ntohl (msg->tunnel_id);
4858 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", tid);
4859 t = tunnel_get_by_local_id (c, tid);
4863 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Tunnel %X unknown.\n", tid);
4864 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id);
4865 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4869 /* Does client own tunnel? I.E: Is this an ACK for BCK traffic? */
4872 /* The client owns the tunnel, ACK is for data to_origin, send BCK ACK. */
4873 t->prev_fc.last_ack_recv++;
4874 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
4878 /* The client doesn't own the tunnel, this ACK is for FWD traffic. */
4879 t->next_fc.last_ack_recv++;
4880 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
4883 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4891 * Iterator over all tunnels to send a monitoring client info about each tunnel.
4893 * @param cls Closure (client handle).
4894 * @param key Key (hashed tunnel ID, unused).
4895 * @param value Tunnel info.
4897 * @return GNUNET_YES, to keep iterating.
4900 monitor_all_tunnels_iterator (void *cls,
4901 const struct GNUNET_HashCode * key,
4904 struct GNUNET_SERVER_Client *client = cls;
4905 struct MeshTunnel *t = value;
4906 struct GNUNET_MESH_LocalMonitor *msg;
4908 msg = GNUNET_malloc (sizeof(struct GNUNET_MESH_LocalMonitor));
4909 GNUNET_PEER_resolve(t->id.oid, &msg->owner);
4910 msg->tunnel_id = htonl (t->id.tid);
4911 msg->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
4912 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS);
4913 GNUNET_PEER_resolve (t->dest, &msg->destination);
4915 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4916 "* sending info about tunnel %s [%u]\n",
4917 GNUNET_i2s (&msg->owner), t->id.tid);
4919 GNUNET_SERVER_notification_context_unicast (nc, client,
4920 &msg->header, GNUNET_NO);
4926 * Handler for client's MONITOR request.
4928 * @param cls Closure (unused).
4929 * @param client Identification of the client.
4930 * @param message The actual message.
4933 handle_local_get_tunnels (void *cls, struct GNUNET_SERVER_Client *client,
4934 const struct GNUNET_MessageHeader *message)
4936 struct MeshClient *c;
4938 /* Sanity check for client registration */
4939 if (NULL == (c = client_get (client)))
4942 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4946 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4947 "Received get tunnels request from client %u\n",
4949 GNUNET_CONTAINER_multihashmap_iterate (tunnels,
4950 monitor_all_tunnels_iterator,
4952 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4953 "Get tunnels request from client %u completed\n",
4955 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4960 * Handler for client's MONITOR_TUNNEL request.
4962 * @param cls Closure (unused).
4963 * @param client Identification of the client.
4964 * @param message The actual message.
4967 handle_local_show_tunnel (void *cls, struct GNUNET_SERVER_Client *client,
4968 const struct GNUNET_MessageHeader *message)
4970 const struct GNUNET_MESH_LocalMonitor *msg;
4971 struct GNUNET_MESH_LocalMonitor *resp;
4972 struct MeshClient *c;
4973 struct MeshTunnel *t;
4975 /* Sanity check for client registration */
4976 if (NULL == (c = client_get (client)))
4979 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4983 msg = (struct GNUNET_MESH_LocalMonitor *) message;
4984 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4985 "Received tunnel info request from client %u for tunnel %s[%X]\n",
4988 ntohl (msg->tunnel_id));
4989 t = tunnel_get (&msg->owner, ntohl (msg->tunnel_id));
4992 /* We don't know the tunnel FIXME */
4993 struct GNUNET_MESH_LocalMonitor warn;
4996 GNUNET_SERVER_notification_context_unicast (nc, client,
4999 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5003 /* Initialize context */
5004 resp = GNUNET_malloc (sizeof (struct GNUNET_MESH_LocalMonitor));
5006 GNUNET_PEER_resolve (t->dest, &resp->destination);
5007 resp->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
5008 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
5009 &resp->header, GNUNET_NO);
5012 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5013 "Monitor tunnel request from client %u completed\n",
5015 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5020 * Functions to handle messages from clients
5022 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
5023 {&handle_local_new_client, NULL,
5024 GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
5025 {&handle_local_tunnel_create, NULL,
5026 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE,
5027 sizeof (struct GNUNET_MESH_TunnelMessage)},
5028 {&handle_local_tunnel_destroy, NULL,
5029 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY,
5030 sizeof (struct GNUNET_MESH_TunnelMessage)},
5031 {&handle_local_data, NULL,
5032 GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA, 0},
5033 {&handle_local_ack, NULL,
5034 GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK,
5035 sizeof (struct GNUNET_MESH_LocalAck)},
5036 {&handle_local_get_tunnels, NULL,
5037 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS,
5038 sizeof (struct GNUNET_MessageHeader)},
5039 {&handle_local_show_tunnel, NULL,
5040 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL,
5041 sizeof (struct GNUNET_MESH_LocalMonitor)},
5047 * Method called whenever a given peer connects.
5049 * @param cls closure
5050 * @param peer peer identity this notification is about
5053 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
5055 struct MeshPeerInfo *peer_info;
5056 struct MeshPeerPath *path;
5058 DEBUG_CONN ("Peer connected\n");
5059 DEBUG_CONN (" %s\n", GNUNET_i2s (&my_full_id));
5060 peer_info = peer_get (peer);
5061 if (myid == peer_info->id)
5063 DEBUG_CONN (" (self)\n");
5064 path = path_new (1);
5068 DEBUG_CONN (" %s\n", GNUNET_i2s (peer));
5069 path = path_new (2);
5070 path->peers[1] = peer_info->id;
5071 GNUNET_PEER_change_rc (peer_info->id, 1);
5072 GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO);
5074 path->peers[0] = myid;
5075 GNUNET_PEER_change_rc (myid, 1);
5076 peer_info_add_path (peer_info, path, GNUNET_YES);
5082 * Method called whenever a peer disconnects.
5084 * @param cls closure
5085 * @param peer peer identity this notification is about
5088 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
5090 struct MeshPeerInfo *pi;
5091 struct MeshPeerQueue *q;
5092 struct MeshPeerQueue *n;
5094 DEBUG_CONN ("Peer disconnected\n");
5095 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
5105 /* TODO try to reroute this traffic instead */
5106 queue_destroy(q, GNUNET_YES);
5109 if (NULL != pi->core_transmit)
5111 GNUNET_CORE_notify_transmit_ready_cancel(pi->core_transmit);
5112 pi->core_transmit = NULL;
5114 peer_remove_path (pi, pi->id, myid);
5117 DEBUG_CONN (" (self)\n");
5119 GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO);
5125 * Install server (service) handlers and start listening to clients.
5130 GNUNET_SERVER_add_handlers (server_handle, client_handlers);
5131 GNUNET_SERVER_connect_notify (server_handle,
5132 &handle_local_client_connect, NULL);
5133 GNUNET_SERVER_disconnect_notify (server_handle,
5134 &handle_local_client_disconnect, NULL);
5135 nc = GNUNET_SERVER_notification_context_create (server_handle, 1);
5137 clients_head = NULL;
5138 clients_tail = NULL;
5140 GNUNET_SERVER_resume (server_handle);
5145 * To be called on core init/fail.
5147 * @param cls Closure (config)
5148 * @param server handle to the server for this service
5149 * @param identity the public identity of this peer
5152 core_init (void *cls, struct GNUNET_CORE_Handle *server,
5153 const struct GNUNET_PeerIdentity *identity)
5155 const struct GNUNET_CONFIGURATION_Handle *c = cls;
5158 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
5159 GNUNET_break (core_handle == server);
5160 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)) ||
5163 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
5164 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5166 GNUNET_i2s (identity));
5167 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5169 GNUNET_i2s (&my_full_id));
5170 GNUNET_CORE_disconnect (core_handle);
5171 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
5172 NULL, /* Closure passed to MESH functions */
5173 &core_init, /* Call core_init once connected */
5174 &core_connect, /* Handle connects */
5175 &core_disconnect, /* remove peers on disconnects */
5176 NULL, /* Don't notify about all incoming messages */
5177 GNUNET_NO, /* For header only in notification */
5178 NULL, /* Don't notify about all outbound messages */
5179 GNUNET_NO, /* For header-only out notification */
5180 core_handlers); /* Register these handlers */
5189 /******************************************************************************/
5190 /************************ MAIN FUNCTIONS ****************************/
5191 /******************************************************************************/
5194 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
5196 * @param cls closure
5197 * @param key current key code
5198 * @param value value in the hash map
5199 * @return GNUNET_YES if we should continue to iterate,
5203 shutdown_tunnel (void *cls, const struct GNUNET_HashCode * key, void *value)
5205 struct MeshTunnel *t = value;
5212 * Iterator over peer hash map entries to destroy the tunnel during shutdown.
5214 * @param cls closure
5215 * @param key current key code
5216 * @param value value in the hash map
5217 * @return GNUNET_YES if we should continue to iterate,
5221 shutdown_peer (void *cls, const struct GNUNET_HashCode * key, void *value)
5223 struct MeshPeerInfo *p = value;
5224 struct MeshPeerQueue *q;
5225 struct MeshPeerQueue *n;
5233 queue_destroy(q, GNUNET_YES);
5237 peer_info_destroy (p);
5243 * Task run during shutdown.
5249 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
5251 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n");
5253 if (core_handle != NULL)
5255 GNUNET_CORE_disconnect (core_handle);
5258 GNUNET_CONTAINER_multihashmap_iterate (tunnels, &shutdown_tunnel, NULL);
5259 GNUNET_CONTAINER_multihashmap_iterate (peers, &shutdown_peer, NULL);
5260 if (dht_handle != NULL)
5262 GNUNET_DHT_disconnect (dht_handle);
5267 GNUNET_SERVER_notification_context_destroy (nc);
5270 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
5272 GNUNET_SCHEDULER_cancel (announce_id_task);
5273 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
5275 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shut down\n");
5280 * Process mesh requests.
5282 * @param cls closure
5283 * @param server the initialized server
5284 * @param c configuration to use
5287 run (void *cls, struct GNUNET_SERVER_Handle *server,
5288 const struct GNUNET_CONFIGURATION_Handle *c)
5291 struct GNUNET_CRYPTO_EccPrivateKey *pk;
5293 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n");
5294 server_handle = server;
5295 GNUNET_SERVER_suspend (server_handle);
5298 GNUNET_CONFIGURATION_get_value_filename (c, "PEER", "PRIVATE_KEY",
5301 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5303 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5304 "mesh", "peer/privatekey");
5305 GNUNET_SCHEDULER_shutdown ();
5310 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_PATH_TIME",
5311 &refresh_path_time))
5313 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5315 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5316 "mesh", "refresh path time");
5317 GNUNET_SCHEDULER_shutdown ();
5322 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "ID_ANNOUNCE_TIME",
5325 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5327 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5328 "mesh", "id announce time");
5329 GNUNET_SCHEDULER_shutdown ();
5334 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "CONNECT_TIMEOUT",
5337 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5339 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5340 "mesh", "connect timeout");
5341 GNUNET_SCHEDULER_shutdown ();
5346 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
5349 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5351 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5352 "mesh", "max msgs queue");
5353 GNUNET_SCHEDULER_shutdown ();
5358 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_TUNNELS",
5361 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5363 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5364 "mesh", "max tunnels");
5365 GNUNET_SCHEDULER_shutdown ();
5370 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
5373 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5375 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5376 "mesh", "default ttl", 64);
5381 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_PEERS",
5384 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5385 _("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5386 "mesh", "max peers", 1000);
5391 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DROP_PERCENT",
5398 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5399 "Mesh is running with drop mode enabled. "
5400 "This is NOT a good idea! "
5401 "Remove the DROP_PERCENT option from your configuration.\n");
5405 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DHT_REPLICATION_LEVEL",
5406 &dht_replication_level))
5408 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5410 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5411 "mesh", "dht replication level", 3);
5412 dht_replication_level = 3;
5415 tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
5416 incoming_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
5417 peers = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
5418 ports = GNUNET_CONTAINER_multihashmap32_create (32);
5420 dht_handle = GNUNET_DHT_connect (c, 64);
5421 if (NULL == dht_handle)
5425 stats = GNUNET_STATISTICS_create ("mesh", c);
5427 /* Scheduled the task to clean up when shutdown is called */
5428 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
5430 pk = GNUNET_CRYPTO_ecc_key_create_from_file (keyfile);
5431 GNUNET_free (keyfile);
5432 GNUNET_assert (NULL != pk);
5433 my_private_key = pk;
5434 GNUNET_CRYPTO_ecc_key_get_public (my_private_key, &my_public_key);
5435 GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
5436 &my_full_id.hashPubKey);
5437 myid = GNUNET_PEER_intern (&my_full_id);
5438 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5439 "Mesh for peer [%s] starting\n",
5440 GNUNET_i2s(&my_full_id));
5442 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
5443 NULL, /* Closure passed to MESH functions */
5444 &core_init, /* Call core_init once connected */
5445 &core_connect, /* Handle connects */
5446 &core_disconnect, /* remove peers on disconnects */
5447 NULL, /* Don't notify about all incoming messages */
5448 GNUNET_NO, /* For header only in notification */
5449 NULL, /* Don't notify about all outbound messages */
5450 GNUNET_NO, /* For header-only out notification */
5451 core_handlers); /* Register these handlers */
5452 if (NULL == core_handle)
5455 GNUNET_SCHEDULER_shutdown ();
5459 next_local_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
5460 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
5461 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mesh service running\n");
5466 * The main function for the mesh service.
5468 * @param argc number of arguments from the command line
5469 * @param argv command line arguments
5470 * @return 0 ok, 1 on error
5473 main (int argc, char *const *argv)
5478 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main()\n");
5479 r = GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
5481 ret = (GNUNET_OK == r) ? 0 : 1;
5482 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main() END\n");
5486 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5487 "Mesh for peer [%s] FWD ACKs %u, BCK ACKs %u\n",
5488 GNUNET_i2s(&my_full_id), debug_fwd_ack, debug_bck_ack);