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_relative_multiply (\
55 GNUNET_TIME_UNIT_SECONDS,\
58 #if MESH_DEBUG_CONNECTION
59 #define DEBUG_CONN(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
61 #define DEBUG_CONN(...)
65 #define DEBUG_DHT(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
67 #define DEBUG_DHT(...)
74 struct timespec __mesh_start;
75 struct timespec __mesh_end;
76 #define INTERVAL_START clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_start))
77 #define INTERVAL_END \
79 clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_end));\
80 double __diff = __mesh_end.tv_nsec - __mesh_start.tv_nsec;\
81 if (__diff < 0) __diff += 1000000000;\
85 #define INTERVAL_SHOW \
87 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "AVG process time: %f ns\n", __sum/__count)
89 #define INTERVAL_START
94 /******************************************************************************/
95 /************************ DATA STRUCTURES ****************************/
96 /******************************************************************************/
98 /** FWD declaration */
104 * Struct containing info about a queued transmission to this peer
111 struct MeshPeerQueue *next;
116 struct MeshPeerQueue *prev;
119 * Peer this transmission is directed to.
121 struct MeshPeerInfo *peer;
124 * Tunnel this message belongs to.
126 struct MeshTunnel *tunnel;
129 * Pointer to info stucture used as cls.
139 * Size of the message
146 * Struct containing all information regarding a given peer
156 * Last time we heard from this peer
158 struct GNUNET_TIME_Absolute last_contact;
161 * Number of attempts to reconnect so far
163 int n_reconnect_attempts;
166 * Paths to reach the peer, ordered by ascending hop count
168 struct MeshPeerPath *path_head;
171 * Paths to reach the peer, ordered by ascending hop count
173 struct MeshPeerPath *path_tail;
176 * Handle to stop the DHT search for a path to this peer
178 struct GNUNET_DHT_GetHandle *dhtget;
181 * Array of tunnels this peer is the target of.
182 * Most probably a small amount, therefore not a hashmap.
183 * When the path to the peer changes, notify these tunnels to let them
184 * re-adjust their path trees.
186 struct MeshTunnel **tunnels;
189 * Number of tunnels this peers participates in
191 unsigned int ntunnels;
194 * Transmission queue to core DLL head
196 struct MeshPeerQueue *queue_head;
199 * Transmission queue to core DLL tail
201 struct MeshPeerQueue *queue_tail;
204 * How many messages are in the queue to this peer.
206 unsigned int queue_n;
209 * Handle for queued transmissions
211 struct GNUNET_CORE_TransmitHandle *core_transmit;
216 * Struct to encapsulate all the Flow Control information to a peer in the
217 * context of a tunnel: Same peer in different tunnels will have independent
218 * flow control structures, allowing to choke/free tunnels according to its
221 struct MeshFlowControl
224 * ID of the last packet sent towards the peer.
226 uint32_t last_pid_sent;
229 * ID of the last packet received from the peer.
231 uint32_t last_pid_recv;
234 * Last ACK sent to the peer (peer can't send more than this PID).
236 uint32_t last_ack_sent;
239 * Last ACK sent towards the origin (for traffic towards leaf node).
241 uint32_t last_ack_recv;
244 * How many payload messages are in the queue towards this peer.
249 * Task to poll the peer in case of a lost ACK causes stall.
251 GNUNET_SCHEDULER_TaskIdentifier poll_task;
254 * How frequently to poll for ACKs.
256 struct GNUNET_TIME_Relative poll_time;
259 * On which tunnel to poll.
260 * Using an explicit poll_ctx would not help memory wise,
261 * since the allocated context would have to be stored in the
262 * fc struct in order to free it upon cancelling poll_task.
264 struct MeshTunnel *t;
269 * Globally unique tunnel identification (owner + number)
270 * DO NOT USE OVER THE NETWORK
275 * Node that owns the tunnel
280 * Tunnel number to differentiate all the tunnels owned by the node oid
281 * ( tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI )
283 MESH_TunnelNumber tid;
288 * Info needed to retry a message in case it gets lost.
290 struct MeshReliableMessage
293 * Double linked list, FIFO style
295 struct MeshReliableMessage *next;
296 struct MeshReliableMessage *prev;
299 * Tunnel Reliability queue this message is in.
301 struct MeshTunnelReliability *rel;
304 * ID of the message (ACK needed to free)
309 * When was this message issued (to calculate ACK delay) FIXME update with traffic
311 struct GNUNET_TIME_Absolute timestamp;
313 /* struct GNUNET_MESH_Data with payload */
318 * Data needed for reliable tunnel endpoint retransmission management.
320 struct MeshTunnelReliability
323 * Tunnel this is about.
325 struct MeshTunnel *t;
328 * DLL of messages sent and not yet ACK'd.
330 struct MeshReliableMessage *head_sent;
331 struct MeshReliableMessage *tail_sent;
334 * DLL of messages received out of order.
336 struct MeshReliableMessage *head_recv;
337 struct MeshReliableMessage *tail_recv;
340 * Task to resend/poll in case no ACK is received.
342 GNUNET_SCHEDULER_TaskIdentifier retry_task;
345 * Counter for exponential backoff.
347 struct GNUNET_TIME_Relative retry_timer;
350 * How long does it usually take to get an ACK. FIXME update with traffic
352 struct GNUNET_TIME_Relative expected_delay;
357 * Struct containing all information regarding a tunnel
358 * For an intermediate node the improtant info used will be:
359 * - id Tunnel unique identification
360 * - paths[0] To know where to send it next
361 * - metainfo: ready, speeds, accounting
368 struct MESH_TunnelID id;
371 * Port of the tunnel.
376 * State of the tunnel.
378 enum MeshTunnelState state;
381 * Local tunnel number ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI or 0 )
383 MESH_TunnelNumber local_tid;
386 * Local tunnel number for local destination clients (incoming number)
387 * ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV or 0). All clients share the same
390 MESH_TunnelNumber local_tid_dest;
393 * Is the tunnel bufferless (minimum latency)?
398 * Is the tunnel reliable?
403 * Force sending ACK? Flag to allow duplicate ACK on POLL.
408 * How many messages do we accept in the forward queue.
410 unsigned int queue_max;
413 * Last time the tunnel was used
415 struct GNUNET_TIME_Absolute timestamp;
418 * Destination of the tunnel.
423 * Next hop in the tunnel. If 0, @c client must be set.
425 GNUNET_PEER_Id next_hop;
428 * Previous hop in the tunnel. If 0, @c owner must be set.
430 GNUNET_PEER_Id prev_hop;
433 * Flow control information about @c next_hop or @c client.
435 struct MeshFlowControl next_fc;
438 * Flow control information about @c prev_hop or @c owner.
440 struct MeshFlowControl prev_fc;
443 * Client owner of the tunnel, if any
445 struct MeshClient *owner;
448 * Client destination of the tunnel, if any.
450 struct MeshClient *client;
453 * Task to keep the used paths alive at the owner,
454 * time tunnel out on all the other peers.
456 GNUNET_SCHEDULER_TaskIdentifier maintenance_task;
459 * Path being used for the tunnel.
461 struct MeshPeerPath *path;
464 * Flag to signal the destruction of the tunnel.
465 * If this is set GNUNET_YES the tunnel will be destroyed
466 * when the queue is empty.
471 * Total messages pending for this tunnels, payload or not.
473 unsigned int pending_messages;
477 * Only present (non-NULL) at the owner of a tunnel.
479 struct MeshTunnelReliability *fwd_rel;
483 * Only present (non-NULL) at the destination of a tunnel.
485 struct MeshTunnelReliability *bck_rel;
490 * Struct containing information about a client of the service
492 * TODO: add a list of 'waiting' ports
499 struct MeshClient *next;
504 struct MeshClient *prev;
507 * Tunnels that belong to this client, indexed by local id
509 struct GNUNET_CONTAINER_MultiHashMap32 *own_tunnels;
512 * Tunnels this client has accepted, indexed by incoming local id
514 struct GNUNET_CONTAINER_MultiHashMap32 *incoming_tunnels;
517 * Handle to communicate with the client
519 struct GNUNET_SERVER_Client *handle;
522 * Ports that this client has declared interest in.
523 * Indexed by port, contains *Client.
525 struct GNUNET_CONTAINER_MultiHashMap32 *ports;
528 * Whether the client is active or shutting down (don't send confirmations
529 * to a client that is shutting down.
534 * ID of the client, mainly for debug messages
541 /******************************************************************************/
542 /************************ DEBUG FUNCTIONS ****************************/
543 /******************************************************************************/
547 * GNUNET_SCHEDULER_Task for printing a message after some operation is done
548 * @param cls string to print
549 * @param success GNUNET_OK if the PUT was transmitted,
550 * GNUNET_NO on timeout,
551 * GNUNET_SYSERR on disconnect from service
552 * after the PUT message was transmitted
553 * (so we don't know if it was received or not)
558 mesh_debug (void *cls, int success)
562 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%s (%d)\n", s, success);
567 unsigned int debug_fwd_ack;
568 unsigned int debug_bck_ack;
572 /******************************************************************************/
573 /*********************** GLOBAL VARIABLES ****************************/
574 /******************************************************************************/
576 /************************** Configuration parameters **************************/
579 * How often to send tunnel keepalives. Tunnels timeout after 4 missed.
581 static struct GNUNET_TIME_Relative refresh_path_time;
584 * How often to PUT own ID in the DHT.
586 static struct GNUNET_TIME_Relative id_announce_time;
589 * Maximum time allowed to connect to a peer found by string.
591 static struct GNUNET_TIME_Relative connect_timeout;
594 * Default TTL for payload packets.
596 static unsigned long long default_ttl;
599 * DHT replication level, see DHT API: GNUNET_DHT_get_start, GNUNET_DHT_put.
601 static unsigned long long dht_replication_level;
604 * How many tunnels are we willing to maintain.
605 * Local tunnels are always allowed, even if there are more tunnels than max.
607 static unsigned long long max_tunnels;
610 * How many messages *in total* are we willing to queue, divided by number of
611 * tunnels to get tunnel queue size.
613 static unsigned long long max_msgs_queue;
616 * How many peers do we want to remember?
618 static unsigned long long max_peers;
621 * Percentage of messages that will be dropped (for test purposes only).
623 static unsigned long long drop_percent;
625 /*************************** Static global variables **************************/
628 * DLL with all the clients, head.
630 static struct MeshClient *clients_head;
633 * DLL with all the clients, tail.
635 static struct MeshClient *clients_tail;
638 * Tunnels known, indexed by MESH_TunnelID (MeshTunnel).
640 static struct GNUNET_CONTAINER_MultiHashMap *tunnels;
643 * Number of tunnels known.
645 static unsigned long long n_tunnels;
648 * Tunnels incoming, indexed by MESH_TunnelNumber
649 * (which is greater than GNUNET_MESH_LOCAL_TUNNEL_ID_SERV).
651 static struct GNUNET_CONTAINER_MultiHashMap32 *incoming_tunnels;
654 * Peers known, indexed by PeerIdentity (MeshPeerInfo).
656 static struct GNUNET_CONTAINER_MultiHashMap *peers;
659 * Handle to communicate with transport
661 // static struct GNUNET_TRANSPORT_Handle *transport_handle;
664 * Handle to communicate with core.
666 static struct GNUNET_CORE_Handle *core_handle;
671 static struct GNUNET_DHT_Handle *dht_handle;
676 static struct GNUNET_SERVER_Handle *server_handle;
679 * Handle to the statistics service.
681 static struct GNUNET_STATISTICS_Handle *stats;
684 * Notification context, to send messages to local clients.
686 static struct GNUNET_SERVER_NotificationContext *nc;
689 * Local peer own ID (memory efficient handle).
691 static GNUNET_PEER_Id myid;
694 * Local peer own ID (full value).
696 static struct GNUNET_PeerIdentity my_full_id;
701 static struct GNUNET_CRYPTO_EccPrivateKey *my_private_key;
706 static struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded my_public_key;
709 * Tunnel ID for the next created tunnel (global tunnel number).
711 static MESH_TunnelNumber next_tid;
714 * Tunnel ID for the next incoming tunnel (local tunnel number).
716 static MESH_TunnelNumber next_local_tid;
719 * All ports clients of this peer have opened.
721 static struct GNUNET_CONTAINER_MultiHashMap32 *ports;
724 * Task to periodically announce itself in the network.
726 GNUNET_SCHEDULER_TaskIdentifier announce_id_task;
729 * Next ID to assign to a client.
731 unsigned int next_client_id;
734 /******************************************************************************/
735 /*********************** DECLARATIONS **************************/
736 /******************************************************************************/
739 * Function to process paths received for a new peer addition. The recorded
740 * paths form the initial tunnel, which can be optimized later.
741 * Called on each result obtained for the DHT search.
744 * @param exp when will this value expire
745 * @param key key of the result
746 * @param type type of the result
747 * @param size number of bytes in data
748 * @param data pointer to the result data
751 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
752 const struct GNUNET_HashCode * key,
753 const struct GNUNET_PeerIdentity *get_path,
754 unsigned int get_path_length,
755 const struct GNUNET_PeerIdentity *put_path,
756 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
757 size_t size, const void *data);
761 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
762 * and insert it in the appropriate structures if the peer is not known yet.
764 * @param peer Full identity of the peer.
766 * @return Existing or newly created peer info.
768 static struct MeshPeerInfo *
769 peer_get (const struct GNUNET_PeerIdentity *peer);
773 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
774 * and insert it in the appropriate structures if the peer is not known yet.
776 * @param peer Short identity of the peer.
778 * @return Existing or newly created peer info.
780 static struct MeshPeerInfo *
781 peer_get_short (const GNUNET_PEER_Id peer);
785 * Build a PeerPath from the paths returned from the DHT, reversing the paths
786 * to obtain a local peer -> destination path and interning the peer ids.
788 * @return Newly allocated and created path
790 static struct MeshPeerPath *
791 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
792 unsigned int get_path_length,
793 const struct GNUNET_PeerIdentity *put_path,
794 unsigned int put_path_length);
798 * Adds a path to the peer_infos of all the peers in the path
800 * @param p Path to process.
801 * @param confirmed Whether we know if the path works or not.
804 path_add_to_peers (struct MeshPeerPath *p, int confirmed);
809 * Search for a tunnel by global ID using full PeerIdentities.
811 * @param oid owner of the tunnel.
812 * @param tid global tunnel number.
814 * @return tunnel handler, NULL if doesn't exist.
816 static struct MeshTunnel *
817 tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid);
821 * Notify a tunnel that a connection has broken that affects at least
824 * @param t Tunnel affected.
825 * @param p1 Peer that got disconnected from p2.
826 * @param p2 Peer that got disconnected from p1.
828 * @return Short ID of the peer disconnected (either p1 or p2).
829 * 0 if the tunnel remained unaffected.
831 static GNUNET_PEER_Id
832 tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
837 * @brief Use the given path for the tunnel.
838 * Update the next and prev hops (and RCs).
839 * (Re)start the path refresh in case the tunnel is locally owned.
841 * @param t Tunnel to update.
842 * @param p Path to use.
845 tunnel_use_path (struct MeshTunnel *t, struct MeshPeerPath *p);
848 * Tunnel is empty: destroy it.
850 * Notifies all participants (peers, cleints) about the destruction.
852 * @param t Tunnel to destroy.
855 tunnel_destroy_empty (struct MeshTunnel *t);
858 * @brief Queue and pass message to core when possible.
860 * If type is payload (UNICAST, TO_ORIGIN, MULTICAST) checks for queue status
861 * and accounts for it. In case the queue is full, the message is dropped and
864 * Otherwise, message is treated as internal and allowed to go regardless of
867 * @param cls Closure (@c type dependant). It will be used by queue_send to
868 * build the message to be sent if not already prebuilt.
869 * @param type Type of the message, 0 for a raw message.
870 * @param size Size of the message.
871 * @param dst Neighbor to send message to.
872 * @param t Tunnel this message belongs to.
875 queue_add (void *cls, uint16_t type, size_t size,
876 struct MeshPeerInfo *dst, struct MeshTunnel *t);
880 * Free a transmission that was already queued with all resources
881 * associated to the request.
883 * @param queue Queue handler to cancel.
884 * @param clear_cls Is it necessary to free associated cls?
887 queue_destroy (struct MeshPeerQueue *queue, int clear_cls);
891 * @brief Get the next transmittable message from the queue.
893 * This will be the head, except in the case of being a data packet
894 * not allowed by the destination peer.
896 * @param peer Destination peer.
898 * @return The next viable MeshPeerQueue element to send to that peer.
899 * NULL when there are no transmittable messages.
901 struct MeshPeerQueue *
902 queue_get_next (const struct MeshPeerInfo *peer);
906 * Core callback to write a queued packet to core buffer
908 * @param cls Closure (peer info).
909 * @param size Number of bytes available in buf.
910 * @param buf Where the to write the message.
912 * @return number of bytes written to buf
915 queue_send (void *cls, size_t size, void *buf);
918 /******************************************************************************/
919 /************************ PERIODIC FUNCTIONS ****************************/
920 /******************************************************************************/
923 * Periodically announce self id in the DHT
926 * @param tc task context
929 announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
933 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
935 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
939 * - Set data expiration in function of X
942 DEBUG_DHT ("DHT_put for ID %s started.\n", GNUNET_i2s (&my_full_id));
944 block.id = my_full_id;
945 GNUNET_DHT_put (dht_handle, /* DHT handle */
946 &my_full_id.hashPubKey, /* Key to use */
947 dht_replication_level, /* Replication level */
948 GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, /* DHT options */
949 GNUNET_BLOCK_TYPE_MESH_PEER, /* Block type */
950 sizeof (block), /* Size of the data */
951 (const char *) &block, /* Data itself */
952 GNUNET_TIME_UNIT_FOREVER_ABS, /* Data expiration */
953 GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */
954 NULL, /* Continuation */
955 NULL); /* Continuation closure */
957 GNUNET_SCHEDULER_add_delayed (id_announce_time, &announce_id, cls);
961 /******************************************************************************/
962 /****************** GENERAL HELPER FUNCTIONS ************************/
963 /******************************************************************************/
967 * Check if client has registered with the service and has not disconnected
969 * @param client the client to check
971 * @return non-NULL if client exists in the global DLL
973 static struct MeshClient *
974 client_get (struct GNUNET_SERVER_Client *client)
976 return GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
981 * Deletes a tunnel from a client (either owner or destination). To be used on
984 * @param c Client whose tunnel to delete.
985 * @param t Tunnel which should be deleted.
988 client_delete_tunnel (struct MeshClient *c, struct MeshTunnel *t)
992 GNUNET_assert (GNUNET_YES ==
993 GNUNET_CONTAINER_multihashmap32_remove (c->own_tunnels,
999 GNUNET_assert (GNUNET_YES ==
1000 GNUNET_CONTAINER_multihashmap32_remove (c->incoming_tunnels,
1007 * Notify the appropriate client that a new incoming tunnel was created.
1009 * @param t Tunnel that was created.
1012 send_client_tunnel_create (struct MeshTunnel *t)
1014 struct GNUNET_MESH_TunnelMessage msg;
1016 if (NULL == t->client)
1018 msg.header.size = htons (sizeof (msg));
1019 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
1020 msg.tunnel_id = htonl (t->local_tid_dest);
1021 msg.port = htonl (t->port);
1023 msg.options |= GNUNET_YES == t->reliable ? GNUNET_MESH_OPTION_RELIABLE : 0;
1024 msg.options |= GNUNET_YES == t->nobuffer ? GNUNET_MESH_OPTION_NOBUFFER : 0;
1025 msg.options = htonl (msg.options);
1026 GNUNET_PEER_resolve (t->id.oid, &msg.peer);
1027 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
1028 &msg.header, GNUNET_NO);
1033 * Notify dest client that the incoming tunnel is no longer valid.
1035 * @param c Client to notify..
1036 * @param t Tunnel that is destroyed.
1039 send_client_tunnel_destroy (struct MeshClient *c, struct MeshTunnel *t)
1041 struct GNUNET_MESH_TunnelMessage msg;
1048 if (c != t->client && c != t->owner)
1053 msg.header.size = htons (sizeof (msg));
1054 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1055 msg.tunnel_id = htonl (t->local_tid_dest);
1056 msg.port = htonl (0);
1057 memset(&msg.peer, 0, sizeof (msg.peer));
1058 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
1059 &msg.header, GNUNET_NO);
1064 * Iterator over all the peers to remove the oldest not-used entry.
1066 * @param cls Closure (unsued).
1067 * @param key ID of the peer.
1068 * @param value Peer_Info of the peer.
1073 peer_info_timeout (void *cls,
1074 const struct GNUNET_HashCode *key,
1081 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
1082 * and insert it in the appropriate structures if the peer is not known yet.
1084 * @param peer Full identity of the peer.
1086 * @return Existing or newly created peer info.
1088 static struct MeshPeerInfo *
1089 peer_get (const struct GNUNET_PeerIdentity *peer)
1091 struct MeshPeerInfo *peer_info;
1093 peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
1094 if (NULL == peer_info)
1097 (struct MeshPeerInfo *) GNUNET_malloc (sizeof (struct MeshPeerInfo));
1098 if (GNUNET_CONTAINER_multihashmap_size (peers) > max_peers)
1100 GNUNET_CONTAINER_multihashmap_iterate (peers,
1104 GNUNET_CONTAINER_multihashmap_put (peers, &peer->hashPubKey, peer_info,
1105 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
1106 peer_info->id = GNUNET_PEER_intern (peer);
1108 peer_info->last_contact = GNUNET_TIME_absolute_get();
1115 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
1116 * and insert it in the appropriate structures if the peer is not known yet.
1118 * @param peer Short identity of the peer.
1120 * @return Existing or newly created peer info.
1122 static struct MeshPeerInfo *
1123 peer_get_short (const GNUNET_PEER_Id peer)
1125 struct GNUNET_PeerIdentity id;
1127 GNUNET_PEER_resolve (peer, &id);
1128 return peer_get (&id);
1133 * Choose the best path towards a peer considering the tunnel properties.
1135 * @param peer The destination peer.
1136 * @param t The tunnel the path is for.
1138 * @return Best current known path towards the peer, if any.
1140 static struct MeshPeerPath *
1141 peer_get_best_path (const struct MeshPeerInfo *peer, const struct MeshTunnel *t)
1143 struct MeshPeerPath *best_p;
1144 struct MeshPeerPath *p;
1145 unsigned int best_cost;
1148 best_p = p = peer->path_head;
1149 best_cost = cost = p->length;
1152 if ((cost = p->length) < best_cost)
1163 * Core callback to write a pre-constructed data packet to core buffer
1165 * @param cls Closure (MeshTransmissionDescriptor with data in "data" member).
1166 * @param size Number of bytes available in buf.
1167 * @param buf Where the to write the message.
1169 * @return number of bytes written to buf
1172 send_core_data_raw (void *cls, size_t size, void *buf)
1174 struct GNUNET_MessageHeader *msg = cls;
1177 GNUNET_assert (NULL != msg);
1178 total_size = ntohs (msg->size);
1180 if (total_size > size)
1185 memcpy (buf, msg, total_size);
1192 * Sends an already built message to a peer, properly registrating
1193 * all used resources.
1195 * @param message Message to send. Function makes a copy of it.
1196 * @param peer Short ID of the neighbor whom to send the message.
1197 * @param t Tunnel on which this message is transmitted.
1200 send_prebuilt_message (const struct GNUNET_MessageHeader *message,
1201 GNUNET_PEER_Id peer,
1202 struct MeshTunnel *t)
1204 struct GNUNET_PeerIdentity id;
1205 struct MeshPeerInfo *neighbor;
1206 struct MeshPeerPath *p;
1211 // GNUNET_TRANSPORT_try_connect(); FIXME use?
1216 size = ntohs (message->size);
1217 data = GNUNET_malloc (size);
1218 memcpy (data, message, size);
1219 type = ntohs(message->type);
1220 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type ||
1221 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type)
1223 struct GNUNET_MESH_Data *u;
1225 u = (struct GNUNET_MESH_Data *) data;
1226 u->ttl = htonl (ntohl (u->ttl) - 1);
1228 GNUNET_PEER_resolve (peer, &id);
1229 neighbor = peer_get (&id);
1230 for (p = neighbor->path_head; NULL != p; p = p->next)
1240 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1241 " %s IS NOT DIRECTLY CONNECTED\n",
1243 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1246 for (p = neighbor->path_head; NULL != p; p = p->next)
1248 struct GNUNET_PeerIdentity debug_id;
1251 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1252 " path with %u hops through:\n",
1254 for (i = 0; i < p->length; i++)
1256 GNUNET_PEER_resolve(p->peers[i], &debug_id);
1257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1259 i, GNUNET_i2s(&debug_id));
1263 GNUNET_break (0); // FIXME sometimes fails (testing disconnect?)
1264 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1265 " no direct connection to %s\n",
1270 if (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK == type)
1281 * Sends a CREATE PATH message for a path to a peer, properly registrating
1282 * all used resources.
1284 * @param t Tunnel for which the path is created.
1287 send_create_path (struct MeshTunnel *t)
1289 struct MeshPeerInfo *neighbor;
1291 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send create path\n");
1292 neighbor = peer_get_short (t->next_hop);
1294 GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE,
1295 sizeof (struct GNUNET_MESH_CreateTunnel) +
1296 (t->path->length * sizeof (struct GNUNET_PeerIdentity)),
1299 t->state = MESH_TUNNEL_WAITING;
1304 * Sends a PATH ACK message in reponse to a received PATH_CREATE directed to us.
1306 * @param t Tunnel which to confirm.
1309 send_path_ack (struct MeshTunnel *t)
1311 struct MeshPeerInfo *peer;
1313 peer = peer_get_short (t->prev_hop);
1316 GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
1317 sizeof (struct GNUNET_MESH_PathACK),
1324 * Try to establish a new connection to this peer in the given tunnel.
1325 * If the peer doesn't have any path to it yet, try to get one.
1326 * If the peer already has some path, send a CREATE PATH towards it.
1328 * @param peer PeerInfo of the peer.
1329 * @param t Tunnel for which to create the path, if possible.
1332 peer_connect (struct MeshPeerInfo *peer, struct MeshTunnel *t)
1334 struct MeshPeerPath *p;
1336 if (NULL != peer->path_head)
1338 p = peer_get_best_path (peer, t);
1339 tunnel_use_path (t, p);
1340 send_create_path (t);
1342 else if (NULL == peer->dhtget)
1344 struct GNUNET_PeerIdentity id;
1346 GNUNET_PEER_resolve (peer->id, &id);
1347 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1348 " Starting DHT GET for peer %s\n", GNUNET_i2s (&id));
1349 peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
1350 GNUNET_BLOCK_TYPE_MESH_PEER, /* type */
1351 &id.hashPubKey, /* key to search */
1352 dht_replication_level, /* replication level */
1353 GNUNET_DHT_RO_RECORD_ROUTE |
1354 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
1356 0, /* xquery bits */
1357 &dht_get_id_handler, peer);
1358 t->state = MESH_TUNNEL_SEARCHING;
1362 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1363 "There is no path but the DHT GET is already started.\n");
1369 * Destroy the peer_info and free any allocated resources linked to it
1371 * @param pi The peer_info to destroy.
1373 * @return GNUNET_OK on success
1376 peer_info_destroy (struct MeshPeerInfo *pi)
1378 struct GNUNET_PeerIdentity id;
1379 struct MeshPeerPath *p;
1380 struct MeshPeerPath *nextp;
1383 GNUNET_PEER_resolve (pi->id, &id);
1384 GNUNET_PEER_change_rc (pi->id, -1);
1387 GNUNET_CONTAINER_multihashmap_remove (peers, &id.hashPubKey, pi))
1390 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1391 "removing peer %s, not in hashmap\n", GNUNET_i2s (&id));
1393 if (NULL != pi->dhtget)
1395 GNUNET_DHT_get_stop (pi->dhtget);
1401 GNUNET_CONTAINER_DLL_remove (pi->path_head, pi->path_tail, p);
1405 for (i = 0; i < pi->ntunnels; i++)
1406 tunnel_destroy_empty (pi->tunnels[i]);
1407 GNUNET_array_grow (pi->tunnels, pi->ntunnels, 0);
1414 * Remove all paths that rely on a direct connection between p1 and p2
1415 * from the peer itself and notify all tunnels about it.
1417 * @param peer PeerInfo of affected peer.
1418 * @param p1 GNUNET_PEER_Id of one peer.
1419 * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and
1422 * TODO: optimize (see below)
1425 peer_remove_path (struct MeshPeerInfo *peer, GNUNET_PEER_Id p1,
1428 struct MeshPeerPath *p;
1429 struct MeshPeerPath *next;
1430 struct MeshPeerInfo *peer_d;
1432 unsigned int destroyed;
1435 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path\n");
1437 for (p = peer->path_head; NULL != p; p = next)
1440 for (i = 0; i < (p->length - 1); i++)
1442 if ((p->peers[i] == p1 && p->peers[i + 1] == p2) ||
1443 (p->peers[i] == p2 && p->peers[i + 1] == p1))
1445 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
1455 for (i = 0; i < peer->ntunnels; i++)
1457 d = tunnel_notify_connection_broken (peer->tunnels[i], p1, p2);
1461 peer_d = peer_get_short (d);
1462 next = peer_get_best_path (peer_d, peer->tunnels[i]);
1463 tunnel_use_path (peer->tunnels[i], next);
1464 peer_connect (peer_d, peer->tunnels[i]);
1466 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path END\n");
1471 * Add the path to the peer and update the path used to reach it in case this
1474 * @param peer_info Destination peer to add the path to.
1475 * @param path New path to add. Last peer must be the peer in arg 1.
1476 * Path will be either used of freed if already known.
1477 * @param trusted Do we trust that this path is real?
1480 peer_info_add_path (struct MeshPeerInfo *peer_info, struct MeshPeerPath *path,
1483 struct MeshPeerPath *aux;
1487 if ((NULL == peer_info) || (NULL == path))
1490 path_destroy (path);
1493 if (path->peers[path->length - 1] != peer_info->id)
1496 path_destroy (path);
1499 if (2 >= path->length && GNUNET_NO == trusted)
1501 /* Only allow CORE to tell us about direct paths */
1502 path_destroy (path);
1505 for (l = 1; l < path->length; l++)
1507 if (path->peers[l] == myid)
1509 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shortening path by %u\n", l);
1510 for (l2 = 0; l2 < path->length - l; l2++)
1512 path->peers[l2] = path->peers[l + l2];
1517 GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id));
1522 struct GNUNET_PeerIdentity id;
1524 GNUNET_PEER_resolve (peer_info->id, &id);
1525 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
1526 path->length, GNUNET_i2s (&id));
1529 l = path_get_length (path);
1532 path_destroy (path);
1536 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
1537 for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
1539 l2 = path_get_length (aux);
1542 GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
1543 peer_info->path_tail, aux, path);
1548 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
1550 path_destroy (path);
1555 GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail,
1562 * Add the path to the origin peer and update the path used to reach it in case
1563 * this is the shortest.
1564 * The path is given in peer_info -> destination, therefore we turn the path
1565 * upside down first.
1567 * @param peer_info Peer to add the path to, being the origin of the path.
1568 * @param path New path to add after being inversed.
1569 * Path will be either used or freed.
1570 * @param trusted Do we trust that this path is real?
1573 peer_info_add_path_to_origin (struct MeshPeerInfo *peer_info,
1574 struct MeshPeerPath *path, int trusted)
1577 peer_info_add_path (peer_info, path, trusted);
1582 * Add a tunnel to the list of tunnels a peer participates in.
1583 * Update the tunnel's destination.
1585 * @param p Peer to add to.
1586 * @param t Tunnel to add.
1589 peer_info_add_tunnel (struct MeshPeerInfo *p, struct MeshTunnel *t)
1593 GNUNET_break (t->dest == p->id);
1597 GNUNET_PEER_change_rc (t->dest, 1);
1598 GNUNET_array_append (p->tunnels, p->ntunnels, t);
1603 * Remove a tunnel from the list of tunnels a peer participates in.
1604 * Free the tunnel's destination.
1606 * @param p Peer to clean.
1607 * @param t Tunnel to remove.
1610 peer_info_remove_tunnel (struct MeshPeerInfo *p, struct MeshTunnel *t)
1614 if (t->dest == p->id)
1616 GNUNET_PEER_change_rc (t->dest, -1);
1619 for (i = 0; i < p->ntunnels; i++)
1621 if (p->tunnels[i] == t)
1623 p->tunnels[i] = p->tunnels[p->ntunnels - 1];
1624 GNUNET_array_grow (p->tunnels, p->ntunnels, p->ntunnels - 1);
1632 * Function called if the connection to the peer has been stalled for a while,
1633 * possibly due to a missed ACK. Poll the peer about its ACK status.
1635 * @param cls Closure (poll ctx).
1636 * @param tc TaskContext.
1639 tunnel_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1641 struct MeshFlowControl *fc = cls;
1642 struct GNUNET_MESH_Poll msg;
1643 struct MeshTunnel *t = fc->t;
1644 GNUNET_PEER_Id peer;
1646 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
1647 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1652 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** Polling!\n");
1654 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL);
1655 msg.header.size = htons (sizeof (msg));
1656 msg.tid = htonl (t->id.tid);
1657 msg.pid = htonl (fc->last_pid_sent);
1658 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
1660 if (fc == &t->prev_fc)
1662 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** prev peer!\n");
1665 else if (fc == &t->next_fc)
1667 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** next peer!\n");
1675 send_prebuilt_message (&msg.header, peer, t);
1676 fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
1677 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
1683 * Build a PeerPath from the paths returned from the DHT, reversing the paths
1684 * to obtain a local peer -> destination path and interning the peer ids.
1686 * @return Newly allocated and created path
1688 static struct MeshPeerPath *
1689 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
1690 unsigned int get_path_length,
1691 const struct GNUNET_PeerIdentity *put_path,
1692 unsigned int put_path_length)
1694 struct MeshPeerPath *p;
1700 GNUNET_PEER_change_rc (myid, 1);
1701 i = get_path_length;
1702 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " GET has %d hops.\n", i);
1703 for (i--; i >= 0; i--)
1705 id = GNUNET_PEER_intern (&get_path[i]);
1706 if (p->length > 0 && id == p->peers[p->length - 1])
1708 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
1709 GNUNET_PEER_change_rc (id, -1);
1713 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from GET: %s.\n",
1714 GNUNET_i2s (&get_path[i]));
1716 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
1717 p->peers[p->length - 1] = id;
1720 i = put_path_length;
1721 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PUT has %d hops.\n", i);
1722 for (i--; i >= 0; i--)
1724 id = GNUNET_PEER_intern (&put_path[i]);
1727 /* PUT path went through us, so discard the path up until now and start
1728 * from here to get a much shorter (and loop-free) path.
1733 if (p->length > 0 && id == p->peers[p->length - 1])
1735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
1736 GNUNET_PEER_change_rc (id, -1);
1740 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from PUT: %s.\n",
1741 GNUNET_i2s (&put_path[i]));
1743 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
1744 p->peers[p->length - 1] = id;
1748 if (get_path_length > 0)
1749 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of GET: %s)\n",
1750 GNUNET_i2s (&get_path[0]));
1751 if (put_path_length > 0)
1752 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of PUT: %s)\n",
1753 GNUNET_i2s (&put_path[0]));
1754 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " In total: %d hops\n",
1756 for (i = 0; i < p->length; i++)
1758 struct GNUNET_PeerIdentity peer_id;
1760 GNUNET_PEER_resolve (p->peers[i], &peer_id);
1761 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u: %s\n", p->peers[i],
1762 GNUNET_i2s (&peer_id));
1770 * Adds a path to the peer_infos of all the peers in the path
1772 * @param p Path to process.
1773 * @param confirmed Whether we know if the path works or not.
1776 path_add_to_peers (struct MeshPeerPath *p, int confirmed)
1780 /* TODO: invert and add */
1781 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
1782 for (i++; i < p->length; i++)
1784 struct MeshPeerInfo *aux;
1785 struct MeshPeerPath *copy;
1787 aux = peer_get_short (p->peers[i]);
1788 copy = path_duplicate (p);
1789 copy->length = i + 1;
1790 peer_info_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
1796 * Send keepalive packets for a peer
1798 * @param cls Closure (tunnel for which to send the keepalive).
1799 * @param tc Notification context.
1802 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
1806 * Search for a tunnel among the incoming tunnels
1808 * @param tid the local id of the tunnel
1810 * @return tunnel handler, NULL if doesn't exist
1812 static struct MeshTunnel *
1813 tunnel_get_incoming (MESH_TunnelNumber tid)
1815 GNUNET_assert (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV);
1816 return GNUNET_CONTAINER_multihashmap32_get (incoming_tunnels, tid);
1821 * Search for a tunnel among the tunnels for a client
1823 * @param c the client whose tunnels to search in
1824 * @param tid the local id of the tunnel
1826 * @return tunnel handler, NULL if doesn't exist
1828 static struct MeshTunnel *
1829 tunnel_get_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid)
1831 if (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1833 return tunnel_get_incoming (tid);
1837 GNUNET_assert (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI);
1838 return GNUNET_CONTAINER_multihashmap32_get (c->own_tunnels, tid);
1844 * Search for a tunnel by global ID using PEER_ID
1846 * @param pi owner of the tunnel
1847 * @param tid global tunnel number
1849 * @return tunnel handler, NULL if doesn't exist
1851 static struct MeshTunnel *
1852 tunnel_get_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid)
1854 struct MESH_TunnelID id;
1855 struct GNUNET_HashCode hash;
1860 GNUNET_CRYPTO_hash (&id, sizeof (struct MESH_TunnelID), &hash);
1861 return GNUNET_CONTAINER_multihashmap_get (tunnels, &hash);
1866 * Search for a tunnel by global ID using full PeerIdentities
1868 * @param oid owner of the tunnel
1869 * @param tid global tunnel number
1871 * @return tunnel handler, NULL if doesn't exist
1873 static struct MeshTunnel *
1874 tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid)
1876 return tunnel_get_by_pi (GNUNET_PEER_search (oid), tid);
1881 * Add a client to a tunnel, initializing all needed data structures.
1883 * @param t Tunnel to which add the client.
1884 * @param c Client which to add to the tunnel.
1887 tunnel_add_client (struct MeshTunnel *t, struct MeshClient *c)
1889 if (NULL != t->client)
1895 GNUNET_CONTAINER_multihashmap32_put (c->incoming_tunnels,
1896 t->local_tid_dest, t,
1897 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
1903 GNUNET_CONTAINER_multihashmap32_put (incoming_tunnels,
1904 t->local_tid_dest, t,
1905 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
1915 tunnel_use_path (struct MeshTunnel *t, struct MeshPeerPath *p)
1917 unsigned int own_pos;
1919 for (own_pos = 0; own_pos < p->length; own_pos++)
1921 if (p->peers[own_pos] == myid)
1924 if (own_pos > p->length - 1)
1930 if (own_pos < p->length - 1)
1931 t->next_hop = p->peers[own_pos + 1];
1933 t->next_hop = p->peers[own_pos];
1934 GNUNET_PEER_change_rc (t->next_hop, 1);
1936 t->prev_hop = p->peers[own_pos - 1];
1938 t->prev_hop = p->peers[0];
1939 GNUNET_PEER_change_rc (t->prev_hop, 1);
1941 if (NULL != t->path)
1942 path_destroy (t->path);
1943 t->path = path_duplicate (p);
1946 if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
1947 GNUNET_SCHEDULER_cancel (t->maintenance_task);
1948 t->maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_path_time,
1955 * Notifies a tunnel that a connection has broken that affects at least
1956 * some of its peers. Sends a notification towards the root of the tree.
1957 * In case the peer is the owner of the tree, notifies the client that owns
1958 * the tunnel and tries to reconnect.
1960 * @param t Tunnel affected.
1961 * @param p1 Peer that got disconnected from p2.
1962 * @param p2 Peer that got disconnected from p1.
1964 * @return Short ID of the peer disconnected (either p1 or p2).
1965 * 0 if the tunnel remained unaffected.
1967 static GNUNET_PEER_Id
1968 tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
1971 // if (myid != p1 && myid != p2) FIXME
1976 // if (tree_get_predecessor (t->tree) != 0)
1978 // /* We are the peer still connected, notify owner of the disconnection. */
1979 // struct GNUNET_MESH_PathBroken msg;
1980 // struct GNUNET_PeerIdentity neighbor;
1982 // msg.header.size = htons (sizeof (msg));
1983 // msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN);
1984 // GNUNET_PEER_resolve (t->id.oid, &msg.oid);
1985 // msg.tid = htonl (t->id.tid);
1986 // msg.peer1 = my_full_id;
1987 // GNUNET_PEER_resolve (pid, &msg.peer2);
1988 // GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor);
1989 // send_prebuilt_message (&msg.header, &neighbor, t);
1996 * Build a local ACK message and send it to a local client.
1998 * @param t Tunnel on which to send the ACK.
1999 * @param c Client to whom send the ACK.
2000 * @param is_fwd Set to GNUNET_YES for FWD ACK (dest->owner)
2003 send_local_ack (struct MeshTunnel *t,
2004 struct MeshClient *c,
2007 struct GNUNET_MESH_LocalAck msg;
2009 msg.header.size = htons (sizeof (msg));
2010 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
2011 msg.tunnel_id = htonl (is_fwd ? t->local_tid : t->local_tid_dest);
2012 GNUNET_SERVER_notification_context_unicast (nc,
2019 * Build an ACK message and queue it to send to the given peer.
2021 * @param t Tunnel on which to send the ACK.
2022 * @param peer Peer to whom send the ACK.
2023 * @param ack Value of the ACK.
2026 send_ack (struct MeshTunnel *t, GNUNET_PEER_Id peer, uint32_t ack)
2028 struct GNUNET_MESH_ACK msg;
2030 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2031 msg.header.size = htons (sizeof (msg));
2032 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK);
2033 msg.pid = htonl (ack);
2034 msg.tid = htonl (t->id.tid);
2036 send_prebuilt_message (&msg.header, peer, t);
2041 * Send an end-to-end FWD ACK message for the most recent in-sequence payload.
2043 * @param t Tunnel this is about.
2046 tunnel_send_fwd_data_ack (struct MeshTunnel *t)
2048 struct GNUNET_MESH_DataACK msg;
2050 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK);
2051 msg.header.size = htons (sizeof (msg));
2052 msg.tid = htonl (t->id.tid);
2053 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2054 msg.pid = htonl (t->prev_fc.last_pid_recv);
2055 msg.futures = 0; // FIXME set bits of other newer messages received
2057 send_prebuilt_message (&msg.header, t->prev_hop, t);
2062 * Send an end-to-end BCK ACK message for the most recent in-sequence payload.
2064 * @param t Tunnel this is about.
2067 tunnel_send_bck_data_ack (struct MeshTunnel *t)
2069 struct GNUNET_MESH_DataACK msg;
2071 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK);
2072 msg.header.size = htons (sizeof (msg));
2073 msg.tid = htonl (t->id.tid);
2074 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2075 msg.pid = htonl (t->next_fc.last_pid_recv);
2076 msg.futures = 0; // FIXME set bits of other newer messages received
2078 send_prebuilt_message (&msg.header, t->next_hop, t);
2083 * Send an ACK informing the predecessor about the available buffer space.
2084 * In case there is no predecessor, inform the owning client.
2085 * If buffering is off, send only on behalf of children or self if endpoint.
2086 * If buffering is on, send when sent to children and buffer space is free.
2087 * Note that although the name is fwd_ack, the FWD mean forward *traffic*,
2088 * the ACK itself goes "back" (towards root).
2090 * @param t Tunnel on which to send the ACK.
2091 * @param type Type of message that triggered the ACK transmission.
2094 tunnel_send_fwd_ack (struct MeshTunnel *t, uint16_t type)
2098 /* Is it after unicast retransmission? */
2101 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
2102 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2103 "ACK due to FWD DATA retransmission\n");
2104 if (GNUNET_YES == t->nobuffer)
2106 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, nobuffer\n");
2109 if (GNUNET_YES == t->reliable && NULL != t->client)
2110 tunnel_send_fwd_data_ack (t);
2112 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2113 if (NULL != t->owner && GNUNET_YES == t->reliable)
2115 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
2117 case GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK:
2118 tunnel_send_fwd_data_ack (t);
2120 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2121 case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
2122 t->force_ack = GNUNET_YES;
2128 /* Check if we need to transmit the ACK */
2129 if (NULL == t->owner &&
2130 t->queue_max > t->next_fc.queue_n * 4 &&
2131 GMC_is_pid_bigger(t->prev_fc.last_ack_sent, t->prev_fc.last_pid_recv) &&
2132 GNUNET_NO == t->force_ack)
2134 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, buffer free\n");
2135 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2136 " t->qmax: %u, t->qn: %u\n",
2137 t->queue_max, t->next_fc.queue_n);
2138 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2139 " t->pid: %u, t->ack: %u\n",
2140 t->prev_fc.last_pid_recv, t->prev_fc.last_ack_sent);
2144 /* Ok, ACK might be necessary, what PID to ACK? */
2145 ack = t->prev_fc.last_pid_recv + t->queue_max - t->next_fc.queue_n;
2146 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK %u\n", ack);
2147 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2148 " last %u, qmax %u, q %u\n",
2149 t->prev_fc.last_pid_recv, t->queue_max, t->next_fc.queue_n);
2150 if (ack == t->prev_fc.last_ack_sent && GNUNET_NO == t->force_ack)
2152 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
2156 t->prev_fc.last_ack_sent = ack;
2157 if (NULL != t->owner)
2158 send_local_ack (t, t->owner, GNUNET_YES);
2159 else if (0 != t->prev_hop)
2160 send_ack (t, t->prev_hop, ack);
2164 t->force_ack = GNUNET_NO;
2169 * Send an ACK informing the children node/client about the available
2171 * If buffering is off, send only on behalf of root (can be self).
2172 * If buffering is on, send when sent to predecessor and buffer space is free.
2173 * Note that although the name is bck_ack, the BCK mean backwards *traffic*,
2174 * the ACK itself goes "forward" (towards children/clients).
2176 * @param t Tunnel on which to send the ACK.
2177 * @param type Type of message that triggered the ACK transmission.
2180 tunnel_send_bck_ack (struct MeshTunnel *t, uint16_t type)
2183 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2184 "Sending BCK ACK on tunnel %u [%u] due to %s\n",
2185 t->id.oid, t->id.tid, GNUNET_MESH_DEBUG_M2S(type));
2186 /* Is it after data to_origin retransmission? */
2189 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
2190 if (GNUNET_YES == t->nobuffer)
2192 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2193 " Not sending ACK, nobuffer + traffic\n");
2197 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2198 /* Why was this here?!
2199 * This prevents the destination from starting traffic to the origin
2201 // if (NULL != t->client && GNUNET_YES == t->reliable)
2203 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
2205 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK:
2206 tunnel_send_bck_data_ack (t);
2208 case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
2209 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2210 t->force_ack = GNUNET_YES;
2216 /* TODO: Check if we need to transmit the ACK (as in fwd) */
2218 ack = t->next_fc.last_pid_recv + t->queue_max - t->prev_fc.queue_n;
2220 if (t->next_fc.last_ack_sent == ack && GNUNET_NO == t->force_ack)
2222 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2223 " Not sending ACK, not needed, last ack sent was %u\n",
2224 t->next_fc.last_ack_sent);
2227 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2228 " Sending BCK ACK %u (last sent: %u)\n",
2229 ack, t->next_fc.last_ack_sent);
2230 t->next_fc.last_ack_sent = ack;
2232 if (NULL != t->client)
2233 send_local_ack (t, t->client, GNUNET_NO);
2234 else if (0 != t->next_hop)
2235 send_ack (t, t->next_hop, ack);
2238 t->force_ack = GNUNET_NO;
2243 * Modify the mesh message TID from global to local and send to client.
2245 * @param t Tunnel on which to send the message.
2246 * @param msg Message to modify and send.
2247 * @param c Client to send to.
2248 * @param tid Tunnel ID to use (c can be both owner and client).
2251 tunnel_send_client_data (struct MeshTunnel *t,
2252 const struct GNUNET_MESH_Data *msg,
2253 struct MeshClient *c, MESH_TunnelNumber tid)
2255 struct GNUNET_MESH_LocalData *copy;
2256 uint16_t size = ntohs (msg->header.size) - sizeof (struct GNUNET_MESH_Data);
2257 char cbuf[size + sizeof (struct GNUNET_MESH_LocalData)];
2259 if (size < sizeof (struct GNUNET_MessageHeader))
2261 GNUNET_break_op (0);
2269 copy = (struct GNUNET_MESH_LocalData *) cbuf;
2270 memcpy (©[1], &msg[1], size);
2271 copy->header.size = htons (sizeof (struct GNUNET_MESH_LocalData) + size);
2272 copy->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA);
2273 copy->tid = htonl (tid);
2274 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
2275 ©->header, GNUNET_NO);
2279 * Modify the unicast message TID from global to local and send to client.
2281 * @param t Tunnel on which to send the message.
2282 * @param msg Message to modify and send.
2285 tunnel_send_client_ucast (struct MeshTunnel *t,
2286 const struct GNUNET_MESH_Data *msg)
2288 tunnel_send_client_data (t, msg, t->client, t->local_tid_dest);
2293 * Modify the to_origin message TID from global to local and send to client.
2295 * @param t Tunnel on which to send the message.
2296 * @param msg Message to modify and send.
2299 tunnel_send_client_to_orig (struct MeshTunnel *t,
2300 const struct GNUNET_MESH_Data *msg)
2302 tunnel_send_client_data (t, msg, t->owner, t->local_tid);
2307 * We haven't received an ACK after a certain time: restransmit the message.
2309 * @param cls Closure (MeshReliableMessage with the message to restransmit)
2310 * @param tc TaskContext.
2313 tunnel_retransmit_message (void *cls,
2314 const struct GNUNET_SCHEDULER_TaskContext *tc)
2316 struct MeshTunnelReliability *rel = cls;
2317 struct MeshReliableMessage *copy;
2318 struct MeshTunnel *t;
2319 struct GNUNET_MESH_Data *payload;
2322 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
2323 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2327 copy = rel->head_sent;
2328 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RETRANSMIT %u\n", copy->id);
2330 payload = (struct GNUNET_MESH_Data *) ©[1];
2331 hop = rel == t->fwd_rel ? t->next_hop : t->prev_hop;
2332 send_prebuilt_message (&payload->header, hop, t);
2333 GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO);
2334 rel->retry_timer = GNUNET_TIME_STD_BACKOFF (rel->retry_timer); // FIXME adapt
2335 rel->retry_task = GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
2336 &tunnel_retransmit_message,
2342 * @brief Re-initiate traffic to this peer if necessary.
2344 * Check if there is traffic queued towards this peer
2345 * and the core transmit handle is NULL (traffic was stalled).
2346 * If so, call core tmt rdy.
2348 * @param peer_id Short ID of peer to which initiate traffic.
2351 peer_unlock_queue(GNUNET_PEER_Id peer_id)
2353 struct MeshPeerInfo *peer;
2354 struct GNUNET_PeerIdentity id;
2355 struct MeshPeerQueue *q;
2358 peer = peer_get_short (peer_id);
2359 if (NULL != peer->core_transmit)
2362 q = queue_get_next (peer);
2365 /* Might br multicast traffic already sent to this particular peer but
2366 * not to other children in this tunnel.
2367 * This way t->queue_n would be > 0 but the queue of this particular peer
2373 GNUNET_PEER_resolve (peer->id, &id);
2374 peer->core_transmit =
2375 GNUNET_CORE_notify_transmit_ready(core_handle,
2378 GNUNET_TIME_UNIT_FOREVER_REL,
2388 * Send a message to all peers and clients in this tunnel that the tunnel
2389 * is no longer valid. If some peer or client should not receive the message,
2390 * should be zero'ed out before calling this function.
2392 * @param t The tunnel whose peers and clients to notify.
2395 tunnel_send_destroy (struct MeshTunnel *t)
2397 struct GNUNET_MESH_TunnelDestroy msg;
2398 struct GNUNET_PeerIdentity id;
2400 msg.header.size = htons (sizeof (msg));
2401 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);
2402 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2403 msg.tid = htonl (t->id.tid);
2404 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2405 " sending tunnel destroy for tunnel: %s [%X]\n",
2406 GNUNET_i2s (&msg.oid), t->id.tid);
2408 if (NULL == t->client && 0 != t->next_hop)
2410 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " child: %u\n", t->next_hop);
2411 GNUNET_PEER_resolve (t->next_hop, &id);
2412 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2413 " sending forward to %s\n",
2415 send_prebuilt_message (&msg.header, t->next_hop, t);
2417 if (NULL == t->owner && 0 != t->prev_hop)
2419 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " parent: %u\n", t->prev_hop);
2420 GNUNET_PEER_resolve (t->prev_hop, &id);
2421 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2422 " sending back to %s\n",
2424 send_prebuilt_message (&msg.header, t->prev_hop, t);
2426 if (NULL != t->owner)
2428 send_client_tunnel_destroy (t->owner, t);
2430 if (NULL != t->client)
2432 send_client_tunnel_destroy (t->client, t);
2438 * Cancel all transmissions towards a neighbor that belongs to a certain tunnel.
2440 * @param t Tunnel which to cancel.
2441 * @param neighbor Short ID of the neighbor to whom cancel the transmissions.
2444 peer_cancel_queues (GNUNET_PEER_Id neighbor, struct MeshTunnel *t)
2446 struct MeshPeerInfo *peer_info;
2447 struct MeshPeerQueue *pq;
2448 struct MeshPeerQueue *next;
2451 return; /* Was local peer, 0'ed in tunnel_destroy_iterator */
2452 peer_info = peer_get_short (neighbor);
2453 for (pq = peer_info->queue_head; NULL != pq; pq = next)
2456 if (pq->tunnel == t)
2458 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == pq->type ||
2459 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == pq->type)
2461 /* Should have been removed on destroy children */
2464 queue_destroy (pq, GNUNET_YES);
2467 if (NULL == peer_info->queue_head && NULL != peer_info->core_transmit)
2469 GNUNET_CORE_notify_transmit_ready_cancel(peer_info->core_transmit);
2470 peer_info->core_transmit = NULL;
2476 * Destroy the tunnel.
2478 * This function does not generate any warning traffic to clients or peers.
2481 * Remove the tunnel from peer_info's and clients' hashmaps.
2482 * Cancel messages belonging to this tunnel queued to neighbors.
2483 * Free any allocated resources linked to the tunnel.
2485 * @param t the tunnel to destroy
2487 * @return GNUNET_OK on success
2490 tunnel_destroy (struct MeshTunnel *t)
2492 struct MeshClient *c;
2493 struct GNUNET_HashCode hash;
2503 struct GNUNET_PeerIdentity id;
2505 GNUNET_PEER_resolve (t->id.oid, &id);
2506 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s [%x]\n",
2507 GNUNET_i2s (&id), t->id.tid);
2509 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
2513 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2514 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t))
2523 GNUNET_CONTAINER_multihashmap32_remove (c->own_tunnels, t->local_tid, t))
2530 if (NULL != t->client)
2534 GNUNET_CONTAINER_multihashmap32_remove (c->incoming_tunnels,
2535 t->local_tid_dest, t))
2541 GNUNET_CONTAINER_multihashmap32_remove (incoming_tunnels,
2542 t->local_tid_dest, t))
2549 if (0 != t->prev_hop)
2551 peer_cancel_queues (t->prev_hop, t);
2552 GNUNET_PEER_change_rc (t->prev_hop, -1);
2554 if (0 != t->next_hop)
2556 peer_cancel_queues (t->next_hop, t);
2557 GNUNET_PEER_change_rc (t->next_hop, -1);
2560 peer_info_remove_tunnel (peer_get_short (t->dest), t);
2563 if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
2564 GNUNET_SCHEDULER_cancel (t->maintenance_task);
2567 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
2568 path_destroy (t->path);
2574 * Tunnel is empty: destroy it.
2576 * Notifies all participants (peers, cleints) about the destruction.
2578 * @param t Tunnel to destroy.
2581 tunnel_destroy_empty (struct MeshTunnel *t)
2585 struct GNUNET_PeerIdentity id;
2587 GNUNET_PEER_resolve (t->id.oid, &id);
2588 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2589 "executing destruction of empty tunnel %s [%X]\n",
2590 GNUNET_i2s (&id), t->id.tid);
2594 if (GNUNET_NO == t->destroy)
2595 tunnel_send_destroy (t);
2596 if (0 == t->pending_messages)
2599 t->destroy = GNUNET_YES;
2603 * Initialize a Flow Control structure to the initial state.
2605 * @param fc Flow Control structure to initialize.
2608 fc_init (struct MeshFlowControl *fc)
2610 fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
2611 fc->last_pid_recv = (uint32_t) -1;
2612 fc->last_ack_sent = (uint32_t) -1; /* No traffic allowed yet */
2613 fc->last_ack_recv = (uint32_t) -1;
2614 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2615 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
2620 * Create a new tunnel
2622 * @param owner Who is the owner of the tunnel (short ID).
2623 * @param tid Tunnel Number of the tunnel.
2624 * @param client Clients that owns the tunnel, NULL for foreign tunnels.
2625 * @param local Tunnel Number for the tunnel, for the client point of view.
2627 * @return A new initialized tunnel. NULL on error.
2629 static struct MeshTunnel *
2630 tunnel_new (GNUNET_PEER_Id owner,
2631 MESH_TunnelNumber tid,
2632 struct MeshClient *client,
2633 MESH_TunnelNumber local)
2635 struct MeshTunnel *t;
2636 struct GNUNET_HashCode hash;
2638 if (n_tunnels >= max_tunnels && NULL == client)
2641 t = GNUNET_malloc (sizeof (struct MeshTunnel));
2644 t->queue_max = (max_msgs_queue / max_tunnels) + 1;
2646 fc_init (&t->next_fc);
2647 fc_init (&t->prev_fc);
2648 t->local_tid = local;
2650 GNUNET_STATISTICS_update (stats, "# tunnels", 1, GNUNET_NO);
2652 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2654 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
2655 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2662 GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR);
2670 GNUNET_CONTAINER_multihashmap32_put (client->own_tunnels,
2672 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2676 GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR);
2686 * Set options in a tunnel, extracted from a bit flag field
2688 * @param t Tunnel to set options to.
2689 * @param options Bit array in host byte order.
2692 tunnel_set_options (struct MeshTunnel *t, uint32_t options)
2694 t->nobuffer = (options & GNUNET_MESH_OPTION_NOBUFFER) != 0 ?
2695 GNUNET_YES : GNUNET_NO;
2696 t->reliable = (options & GNUNET_MESH_OPTION_RELIABLE) != 0 ?
2697 GNUNET_YES : GNUNET_NO;
2702 * Iterator for deleting each tunnel whose client endpoint disconnected.
2704 * @param cls Closure (client that has disconnected).
2705 * @param key The local tunnel id (used to access the hashmap).
2706 * @param value The value stored at the key (tunnel to destroy).
2708 * @return GNUNET_OK, keep iterating.
2711 tunnel_destroy_iterator (void *cls,
2715 struct MeshTunnel *t = value;
2716 struct MeshClient *c = cls;
2718 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2719 " Tunnel %X / %X destroy, due to client %u shutdown.\n",
2720 t->local_tid, t->local_tid_dest, c->id);
2721 client_delete_tunnel (c, t);
2724 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is destination.\n", c->id);
2726 if (0 != t->next_hop) { /* destroy could come before a path is used */
2727 GNUNET_PEER_change_rc (t->next_hop, -1);
2733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is owner.\n", c->id);
2735 if (0 != t->prev_hop) { /* destroy could come before a path is used */
2736 GNUNET_PEER_change_rc (t->prev_hop, -1);
2741 tunnel_destroy_empty (t);
2748 * Timeout function, destroys tunnel if called
2750 * @param cls Closure (tunnel to destroy).
2751 * @param tc TaskContext
2754 tunnel_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2756 struct MeshTunnel *t = cls;
2757 struct GNUNET_PeerIdentity id;
2759 t->maintenance_task = GNUNET_SCHEDULER_NO_TASK;
2760 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2762 GNUNET_PEER_resolve(t->id.oid, &id);
2763 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2764 "Tunnel %s [%X] timed out. Destroying.\n",
2765 GNUNET_i2s(&id), t->id.tid);
2766 if (NULL != t->client)
2767 send_client_tunnel_destroy (t->client, t);
2768 tunnel_destroy (t); /* Do not notify other */
2773 * Resets the tunnel timeout. Starts it if no timeout was running.
2775 * @param t Tunnel whose timeout to reset.
2777 * TODO use heap to improve efficiency of scheduler.
2780 tunnel_reset_timeout (struct MeshTunnel *t)
2782 if (NULL != t->owner || 0 != t->local_tid || 0 == t->prev_hop)
2784 if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
2785 GNUNET_SCHEDULER_cancel (t->maintenance_task);
2786 t->maintenance_task =
2787 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
2788 (refresh_path_time, 4), &tunnel_timeout, t);
2792 /******************************************************************************/
2793 /**************** MESH NETWORK HANDLER HELPERS ***********************/
2794 /******************************************************************************/
2797 * Function to send a create path packet to a peer.
2799 * @param cls closure
2800 * @param size number of bytes available in buf
2801 * @param buf where the callee should write the message
2802 * @return number of bytes written to buf
2805 send_core_path_create (void *cls, size_t size, void *buf)
2807 struct MeshTunnel *t = cls;
2808 struct GNUNET_MESH_CreateTunnel *msg;
2809 struct GNUNET_PeerIdentity *peer_ptr;
2810 struct MeshPeerPath *p = t->path;
2815 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATE PATH sending...\n");
2817 sizeof (struct GNUNET_MESH_CreateTunnel) +
2818 p->length * sizeof (struct GNUNET_PeerIdentity);
2820 if (size < size_needed || NULL == buf)
2825 msg = (struct GNUNET_MESH_CreateTunnel *) buf;
2826 msg->header.size = htons (size_needed);
2827 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE);
2828 msg->tid = ntohl (t->id.tid);
2831 if (GNUNET_YES == t->nobuffer)
2832 opt |= GNUNET_MESH_OPTION_NOBUFFER;
2833 if (GNUNET_YES == t->reliable)
2834 opt |= GNUNET_MESH_OPTION_RELIABLE;
2835 msg->opt = htonl (opt);
2836 msg->port = htonl (t->port);
2838 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
2839 for (i = 0; i < p->length; i++)
2841 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
2844 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2845 "CREATE PATH (%u bytes long) sent!\n", size_needed);
2851 * Creates a path ack message in buf and frees all unused resources.
2853 * @param cls closure (MeshTransmissionDescriptor)
2854 * @param size number of bytes available in buf
2855 * @param buf where the callee should write the message
2856 * @return number of bytes written to buf
2859 send_core_path_ack (void *cls, size_t size, void *buf)
2861 struct MeshTunnel *t = cls;
2862 struct GNUNET_MESH_PathACK *msg = buf;
2864 GNUNET_assert (NULL != t);
2865 if (sizeof (struct GNUNET_MESH_PathACK) > size)
2870 t->prev_fc.last_ack_sent = t->nobuffer ? 0 : t->queue_max - 1;
2871 msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK));
2872 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
2873 GNUNET_PEER_resolve (t->id.oid, &msg->oid);
2874 msg->tid = htonl (t->id.tid);
2875 msg->peer_id = my_full_id;
2876 msg->ack = htonl (t->prev_fc.last_ack_sent);
2878 /* TODO add signature */
2880 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "PATH ACK sent!\n");
2881 return sizeof (struct GNUNET_MESH_PathACK);
2886 * Free a transmission that was already queued with all resources
2887 * associated to the request.
2889 * @param queue Queue handler to cancel.
2890 * @param clear_cls Is it necessary to free associated cls?
2893 queue_destroy (struct MeshPeerQueue *queue, int clear_cls)
2895 struct MeshFlowControl *fc;
2897 if (GNUNET_YES == clear_cls)
2899 switch (queue->type)
2901 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
2902 GNUNET_log (GNUNET_ERROR_TYPE_INFO, " cancelling TUNNEL_DESTROY\n");
2903 GNUNET_break (GNUNET_YES == queue->tunnel->destroy);
2905 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
2906 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
2907 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2908 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2909 case GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE:
2910 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2911 " prebuilt message\n");
2912 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2914 GNUNET_MESH_DEBUG_M2S (queue->type));
2916 case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
2917 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type create path\n");
2921 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2922 " type %s unknown!\n",
2923 GNUNET_MESH_DEBUG_M2S (queue->type));
2925 GNUNET_free_non_null (queue->cls);
2927 GNUNET_CONTAINER_DLL_remove (queue->peer->queue_head,
2928 queue->peer->queue_tail,
2931 /* Delete from appropriate fc in the tunnel */
2932 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == queue->type ||
2933 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == queue->type )
2935 if (queue->peer->id == queue->tunnel->prev_hop)
2936 fc = &queue->tunnel->prev_fc;
2937 else if (queue->peer->id == queue->tunnel->next_hop)
2938 fc = &queue->tunnel->next_fc;
2942 GNUNET_free (queue);
2947 GNUNET_free (queue);
2952 * @brief Get the next transmittable message from the queue.
2954 * This will be the head, except in the case of being a data packet
2955 * not allowed by the destination peer.
2957 * @param peer Destination peer.
2959 * @return The next viable MeshPeerQueue element to send to that peer.
2960 * NULL when there are no transmittable messages.
2962 struct MeshPeerQueue *
2963 queue_get_next (const struct MeshPeerInfo *peer)
2965 struct MeshPeerQueue *q;
2967 struct GNUNET_MESH_Data *dmsg;
2968 struct MeshTunnel* t;
2972 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* selecting message\n");
2973 for (q = peer->queue_head; NULL != q; q = q->next)
2976 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2978 GNUNET_MESH_DEBUG_M2S (q->type));
2979 dmsg = (struct GNUNET_MESH_Data *) q->cls;
2980 pid = ntohl (dmsg->pid);
2983 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
2984 ack = t->next_fc.last_ack_recv;
2986 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
2987 ack = t->prev_fc.last_ack_recv;
2990 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2994 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2995 "* ACK: %u, PID: %u\n",
2997 if (GNUNET_NO == GMC_is_pid_bigger (pid, ack))
2999 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3005 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3009 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3010 "* nothing found\n");
3016 queue_send (void *cls, size_t size, void *buf)
3018 struct MeshPeerInfo *peer = cls;
3019 struct GNUNET_MessageHeader *msg;
3020 struct MeshPeerQueue *queue;
3021 struct MeshTunnel *t;
3022 struct GNUNET_PeerIdentity dst_id;
3023 struct MeshFlowControl *fc;
3028 peer->core_transmit = NULL;
3030 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Queue send\n");
3031 queue = queue_get_next (peer);
3033 /* Queue has no internal mesh traffic nor sendable payload */
3036 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not ready, return\n");
3037 if (NULL == peer->queue_head)
3038 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
3041 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not empty\n");
3043 GNUNET_PEER_resolve (peer->id, &dst_id);
3044 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3046 GNUNET_i2s (&dst_id));
3047 /* Check if buffer size is enough for the message */
3048 if (queue->size > size)
3050 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3051 "* not enough room, reissue\n");
3052 peer->core_transmit =
3053 GNUNET_CORE_notify_transmit_ready (core_handle,
3056 GNUNET_TIME_UNIT_FOREVER_REL,
3063 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* size ok\n");
3066 GNUNET_assert (0 < t->pending_messages);
3067 t->pending_messages--;
3071 switch (queue->type)
3074 case GNUNET_MESSAGE_TYPE_MESH_ACK:
3075 case GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK:
3076 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK:
3077 case GNUNET_MESSAGE_TYPE_MESH_POLL:
3078 case GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN:
3079 case GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY:
3080 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
3081 case GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE:
3082 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3084 GNUNET_MESH_DEBUG_M2S (queue->type));
3086 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3087 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3088 data_size = send_core_data_raw (queue->cls, size, buf);
3089 msg = (struct GNUNET_MessageHeader *) buf;
3090 type = ntohs (msg->type);
3092 case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
3093 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path create\n");
3094 data_size = send_core_path_create (queue->cls, size, buf);
3096 case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
3097 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n");
3098 data_size = send_core_path_ack (queue->cls, size, buf);
3102 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3103 "* type unknown: %u\n",
3108 if (0 < drop_percent &&
3109 GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
3111 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3112 "Dropping message of type %s\n",
3113 GNUNET_MESH_DEBUG_M2S(queue->type));
3116 /* Free queue, but cls was freed by send_core_* */
3117 queue_destroy (queue, GNUNET_NO);
3119 /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
3120 pid = ((struct GNUNET_MESH_Data *) buf)->pid;
3124 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3125 if (GMC_is_pid_bigger(pid, t->next_fc.last_pid_sent))
3126 t->next_fc.last_pid_sent = pid;
3127 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST);
3129 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3130 if (GMC_is_pid_bigger(pid, t->prev_fc.last_pid_sent))
3131 t->prev_fc.last_pid_sent = pid;
3132 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
3138 if (GNUNET_YES == t->destroy && 0 == t->pending_messages)
3140 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying tunnel!\n");
3144 /* If more data in queue, send next */
3145 queue = queue_get_next (peer);
3148 struct GNUNET_PeerIdentity id;
3150 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* more data!\n");
3151 GNUNET_PEER_resolve (peer->id, &id);
3152 peer->core_transmit =
3153 GNUNET_CORE_notify_transmit_ready(core_handle,
3156 GNUNET_TIME_UNIT_FOREVER_REL,
3162 else if (NULL != peer->queue_head)
3164 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3166 GNUNET_i2s (&my_full_id));
3167 if (peer->id == t->next_hop)
3169 else if (peer->id == t->prev_hop)
3176 if (NULL != fc && GNUNET_SCHEDULER_NO_TASK == fc->poll_task)
3179 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
3183 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Return %d\n", data_size);
3189 * @brief Queue and pass message to core when possible.
3191 * If type is payload (UNICAST, TO_ORIGIN) checks for queue status and
3192 * accounts for it. In case the queue is full, the message is dropped and
3195 * Otherwise, message is treated as internal and allowed to go regardless of
3198 * @param cls Closure (@c type dependant). It will be used by queue_send to
3199 * build the message to be sent if not already prebuilt.
3200 * @param type Type of the message, 0 for a raw message.
3201 * @param size Size of the message.
3202 * @param dst Neighbor to send message to.
3203 * @param t Tunnel this message belongs to.
3206 queue_add (void *cls, uint16_t type, size_t size,
3207 struct MeshPeerInfo *dst, struct MeshTunnel *t)
3209 struct MeshPeerQueue *queue;
3210 struct GNUNET_PeerIdentity id;
3211 struct MeshFlowControl *fc;
3217 priority = GNUNET_NO;
3218 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type)
3221 pid = ntohl (((struct GNUNET_MESH_Data *)cls)->pid);
3223 else if (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type)
3226 pid = ntohl (((struct GNUNET_MESH_Data *)cls)->pid);
3230 if (fc->queue_n >= t->queue_max)
3233 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3234 "queue full: %u/%u\n",
3235 fc->queue_n, t->queue_max);
3236 GNUNET_STATISTICS_update (stats,
3237 "# messages dropped (buffer full)",
3239 /* Get the PID of the oldest message in the queue */
3240 for (queue = dst->queue_head; queue != NULL; queue = queue->next)
3241 if (queue->type == type && queue->tunnel == t)
3243 pid_q = ntohl (((struct GNUNET_MESH_Data *)(queue->cls))->pid);
3244 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3245 "pid: %u, pid_q: %u\n", pid, pid_q);
3248 GNUNET_assert (NULL != queue);
3250 /* If this is an earlier message that that, give it priority:
3251 * - drop the newest message in the queue
3252 * - instert current one at the end of the queue (first to get out)
3254 if (GNUNET_YES == t->reliable && GMC_is_pid_bigger(pid_q, pid))
3256 for (queue = dst->queue_tail; queue != NULL; queue = queue->prev)
3257 if (queue->type == type && queue->tunnel == t)
3259 /* Drop message from queue */
3260 pid_q = ntohl (((struct GNUNET_MESH_Data *)(queue->cls))->pid);
3261 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3262 "dropping pid: %u\n", pid_q);
3263 queue_destroy (queue, GNUNET_YES);
3264 t->pending_messages--;
3265 priority = GNUNET_YES;
3270 return; /* Drop this message */
3274 queue = GNUNET_malloc (sizeof (struct MeshPeerQueue));
3280 if (GNUNET_YES == priority)
3281 GNUNET_CONTAINER_DLL_insert (dst->queue_head, dst->queue_tail, queue);
3283 GNUNET_CONTAINER_DLL_insert_tail (dst->queue_head, dst->queue_tail, queue);
3284 if (NULL == dst->core_transmit)
3286 GNUNET_PEER_resolve (dst->id, &id);
3287 dst->core_transmit =
3288 GNUNET_CORE_notify_transmit_ready (core_handle,
3291 GNUNET_TIME_UNIT_FOREVER_REL,
3297 t->pending_messages++;
3301 /******************************************************************************/
3302 /******************** MESH NETWORK HANDLERS **************************/
3303 /******************************************************************************/
3307 * Core handler for path creation
3309 * @param cls closure
3310 * @param message message
3311 * @param peer peer identity this notification is about
3313 * @return GNUNET_OK to keep the connection open,
3314 * GNUNET_SYSERR to close it (signal serious error)
3317 handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer,
3318 const struct GNUNET_MessageHeader *message)
3320 unsigned int own_pos;
3323 MESH_TunnelNumber tid;
3324 struct GNUNET_MESH_CreateTunnel *msg;
3325 struct GNUNET_PeerIdentity *pi;
3326 struct MeshPeerPath *path;
3327 struct MeshPeerInfo *dest_peer_info;
3328 struct MeshPeerInfo *orig_peer_info;
3329 struct MeshTunnel *t;
3331 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3332 "Received a path create msg [%s]\n",
3333 GNUNET_i2s (&my_full_id));
3334 size = ntohs (message->size);
3335 if (size < sizeof (struct GNUNET_MESH_CreateTunnel))
3337 GNUNET_break_op (0);
3341 size -= sizeof (struct GNUNET_MESH_CreateTunnel);
3342 if (size % sizeof (struct GNUNET_PeerIdentity))
3344 GNUNET_break_op (0);
3347 size /= sizeof (struct GNUNET_PeerIdentity);
3350 GNUNET_break_op (0);
3353 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
3354 msg = (struct GNUNET_MESH_CreateTunnel *) message;
3356 tid = ntohl (msg->tid);
3357 pi = (struct GNUNET_PeerIdentity *) &msg[1];
3358 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3359 " path is for tunnel %s[%X].\n", GNUNET_i2s (pi), tid);
3360 t = tunnel_get (pi, tid);
3361 if (NULL == t) /* might be a local tunnel */
3365 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating tunnel\n");
3366 t = tunnel_new (GNUNET_PEER_intern (pi), tid, NULL, 0);
3372 t->port = ntohl (msg->port);
3373 opt = ntohl (msg->opt);
3374 if (0 != (opt & GNUNET_MESH_OPTION_NOBUFFER))
3376 t->nobuffer = GNUNET_YES;
3379 if (0 != (opt & GNUNET_MESH_OPTION_RELIABLE))
3381 t->reliable = GNUNET_YES;
3383 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " nobuffer:%d\n", t->nobuffer);
3385 tunnel_reset_timeout (t);
3387 t->state = MESH_TUNNEL_WAITING;
3389 GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey);
3390 if (NULL == dest_peer_info)
3392 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3393 " Creating PeerInfo for destination.\n");
3394 dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
3395 dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]);
3396 GNUNET_CONTAINER_multihashmap_put (peers, &pi[size - 1].hashPubKey,
3398 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
3400 orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey);
3401 if (NULL == orig_peer_info)
3403 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3404 " Creating PeerInfo for origin.\n");
3405 orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
3406 orig_peer_info->id = GNUNET_PEER_intern (pi);
3407 GNUNET_CONTAINER_multihashmap_put (peers, &pi->hashPubKey, orig_peer_info,
3408 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
3410 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
3411 path = path_new (size);
3413 for (i = 0; i < size; i++)
3415 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n",
3416 GNUNET_i2s (&pi[i]));
3417 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
3418 if (path->peers[i] == myid)
3421 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
3422 if (own_pos == 0 && path->peers[own_pos] != myid)
3424 /* create path: self not found in path through self */
3425 GNUNET_break_op (0);
3426 path_destroy (path);
3430 path_add_to_peers (path, GNUNET_NO);
3431 tunnel_use_path (t, path);
3433 peer_info_add_tunnel (dest_peer_info, t);
3435 if (own_pos == size - 1)
3437 struct MeshClient *c;
3439 /* Find target client */
3440 c = GNUNET_CONTAINER_multihashmap32_get (ports, t->port);
3443 /* TODO send reject */
3447 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
3448 peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_YES);
3450 /* Assign local tid */
3451 while (NULL != tunnel_get_incoming (next_local_tid))
3452 next_local_tid = (next_local_tid + 1) | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
3453 t->local_tid_dest = next_local_tid++;
3454 next_local_tid = next_local_tid | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
3456 if (GNUNET_YES == t->reliable)
3458 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
3459 t->bck_rel = GNUNET_malloc (sizeof (struct MeshTunnelReliability));
3461 t->bck_rel->expected_delay = MESH_RETRANSMIT_TIME;
3464 tunnel_add_client (t, c);
3465 send_client_tunnel_create (t);
3470 struct MeshPeerPath *path2;
3472 t->next_hop = path->peers[own_pos + 1];
3473 GNUNET_PEER_change_rc(t->next_hop, 1);
3475 /* It's for somebody else! Retransmit. */
3476 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
3477 path2 = path_duplicate (path);
3478 peer_info_add_path (dest_peer_info, path2, GNUNET_NO);
3479 peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_NO);
3480 send_create_path (t);
3488 * Core handler for path ACKs
3490 * @param cls closure
3491 * @param message message
3492 * @param peer peer identity this notification is about
3494 * @return GNUNET_OK to keep the connection open,
3495 * GNUNET_SYSERR to close it (signal serious error)
3498 handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
3499 const struct GNUNET_MessageHeader *message)
3501 struct GNUNET_MESH_PathACK *msg;
3502 struct MeshPeerInfo *peer_info;
3503 struct MeshPeerPath *p;
3504 struct MeshTunnel *t;
3506 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a path ACK msg [%s]\n",
3507 GNUNET_i2s (&my_full_id));
3508 msg = (struct GNUNET_MESH_PathACK *) message;
3509 t = tunnel_get (&msg->oid, ntohl(msg->tid));
3512 /* TODO notify that we don't know the tunnel */
3513 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel", 1, GNUNET_NO);
3514 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't know the tunnel %s [%X]!\n",
3515 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3518 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %s [%X]\n",
3519 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3521 peer_info = peer_get (&msg->peer_id);
3522 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by peer %s\n",
3523 GNUNET_i2s (&msg->peer_id));
3524 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n",
3527 /* Add path to peers? */
3531 path_add_to_peers (p, GNUNET_YES);
3537 t->state = MESH_TUNNEL_READY;
3538 t->next_fc.last_ack_recv = (NULL == t->client) ? ntohl (msg->ack) : 0;
3539 t->prev_fc.last_ack_sent = ntohl (msg->ack);
3541 /* Message for us? */
3542 if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity)))
3544 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
3545 if (NULL == t->owner)
3547 GNUNET_break_op (0);
3550 if (NULL != peer_info->dhtget)
3552 GNUNET_DHT_get_stop (peer_info->dhtget);
3553 peer_info->dhtget = NULL;
3555 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
3556 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
3560 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3561 " not for us, retransmitting...\n");
3562 peer_info = peer_get (&msg->oid);
3563 send_prebuilt_message (message, t->prev_hop, t);
3569 * Core handler for notifications of broken paths
3571 * @param cls closure
3572 * @param message message
3573 * @param peer peer identity this notification is about
3575 * @return GNUNET_OK to keep the connection open,
3576 * GNUNET_SYSERR to close it (signal serious error)
3579 handle_mesh_path_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
3580 const struct GNUNET_MessageHeader *message)
3582 struct GNUNET_MESH_PathBroken *msg;
3583 struct MeshTunnel *t;
3585 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3586 "Received a PATH BROKEN msg from %s\n", GNUNET_i2s (peer));
3587 msg = (struct GNUNET_MESH_PathBroken *) message;
3588 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
3589 GNUNET_i2s (&msg->peer1));
3590 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
3591 GNUNET_i2s (&msg->peer2));
3592 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3595 GNUNET_break_op (0);
3598 tunnel_notify_connection_broken (t, GNUNET_PEER_search (&msg->peer1),
3599 GNUNET_PEER_search (&msg->peer2));
3606 * Core handler for tunnel destruction
3608 * @param cls closure
3609 * @param message message
3610 * @param peer peer identity this notification is about
3612 * @return GNUNET_OK to keep the connection open,
3613 * GNUNET_SYSERR to close it (signal serious error)
3616 handle_mesh_tunnel_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
3617 const struct GNUNET_MessageHeader *message)
3619 struct GNUNET_MESH_TunnelDestroy *msg;
3620 struct MeshTunnel *t;
3622 msg = (struct GNUNET_MESH_TunnelDestroy *) message;
3623 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3624 "Got a TUNNEL DESTROY packet from %s\n",
3626 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3627 " for tunnel %s [%u]\n",
3628 GNUNET_i2s (&msg->oid), ntohl (msg->tid));
3629 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3632 /* Probably already got the message from another path,
3633 * destroyed the tunnel and retransmitted to children.
3636 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel",
3640 if (t->local_tid_dest >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
3642 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "INCOMING TUNNEL %X %X\n",
3643 t->local_tid, t->local_tid_dest);
3645 if (GNUNET_PEER_search (peer) == t->prev_hop)
3647 // TODO check owner's signature
3648 // TODO add owner's signatue to tunnel for retransmission
3649 peer_cancel_queues (t->prev_hop, t);
3650 GNUNET_PEER_change_rc (t->prev_hop, -1);
3653 else if (GNUNET_PEER_search (peer) == t->next_hop)
3655 // TODO check dest's signature
3656 // TODO add dest's signatue to tunnel for retransmission
3657 peer_cancel_queues (t->next_hop, t);
3658 GNUNET_PEER_change_rc (t->next_hop, -1);
3663 GNUNET_break_op (0);
3664 // TODO check both owner AND destination's signature to see which matches
3665 // TODO restransmit in appropriate direction
3668 tunnel_destroy_empty (t);
3670 // TODO: add timeout to destroy the tunnel anyway
3676 * Core handler for mesh network traffic going from the origin to a peer
3678 * @param cls closure
3679 * @param peer peer identity this notification is about
3680 * @param message message
3681 * @return GNUNET_OK to keep the connection open,
3682 * GNUNET_SYSERR to close it (signal serious error)
3685 handle_mesh_unicast (void *cls, const struct GNUNET_PeerIdentity *peer,
3686 const struct GNUNET_MessageHeader *message)
3688 struct GNUNET_MESH_Data *msg;
3689 struct MeshTunnel *t;
3694 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a unicast packet from %s\n",
3697 size = ntohs (message->size);
3699 sizeof (struct GNUNET_MESH_Data) +
3700 sizeof (struct GNUNET_MessageHeader))
3705 msg = (struct GNUNET_MESH_Data *) message;
3706 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " of type %s\n",
3707 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
3709 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3712 /* TODO notify back: we don't know this tunnel */
3713 GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO);
3714 GNUNET_break_op (0);
3717 pid = ntohl (msg->pid);
3718 if (GMC_is_pid_bigger (pid, t->prev_fc.last_ack_sent))
3720 GNUNET_STATISTICS_update (stats, "# unsolicited unicast", 1, GNUNET_NO);
3721 GNUNET_break_op (0);
3722 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3723 "Received PID %u, ACK %u\n",
3724 pid, t->prev_fc.last_ack_sent);
3725 tunnel_send_fwd_ack(t, GNUNET_MESSAGE_TYPE_MESH_POLL);
3729 tunnel_reset_timeout (t);
3730 if (t->dest == myid)
3732 /* TODO signature verification */
3733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3734 " it's for us! sending to clients...\n");
3735 GNUNET_STATISTICS_update (stats, "# unicast received", 1, GNUNET_NO);
3736 // if (GMC_is_pid_bigger(pid, t->prev_fc.last_pid_recv)) FIXME use
3737 if ( (GNUNET_NO == t->reliable &&
3738 GMC_is_pid_bigger(pid, t->prev_fc.last_pid_recv))
3740 (GNUNET_YES == t->reliable &&
3741 pid == t->prev_fc.last_pid_recv + 1) )
3743 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3744 " pid %u not seen yet, forwarding\n", pid);
3745 t->prev_fc.last_pid_recv = pid;
3746 tunnel_send_client_ucast (t, msg);
3750 // GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO);
3751 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3752 " Pid %u not expected (%u), sending FWD ACK!\n",
3753 pid, t->prev_fc.last_pid_recv + 1);
3755 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK);
3758 if (GMC_is_pid_bigger(pid, t->prev_fc.last_pid_recv))
3759 t->prev_fc.last_pid_recv = pid;
3760 if (0 == t->next_hop)
3765 ttl = ntohl (msg->ttl);
3766 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
3769 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
3770 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
3771 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
3774 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3775 " not for us, retransmitting...\n");
3777 send_prebuilt_message (message, t->next_hop, t);
3778 GNUNET_STATISTICS_update (stats, "# unicast forwarded", 1, GNUNET_NO);
3784 * Core handler for mesh network traffic toward the owner of a tunnel
3786 * @param cls closure
3787 * @param message message
3788 * @param peer peer identity this notification is about
3790 * @return GNUNET_OK to keep the connection open,
3791 * GNUNET_SYSERR to close it (signal serious error)
3794 handle_mesh_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
3795 const struct GNUNET_MessageHeader *message)
3797 struct GNUNET_MESH_Data *msg;
3798 struct MeshTunnel *t;
3803 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a ToOrigin packet from %s\n",
3805 size = ntohs (message->size);
3806 if (size < sizeof (struct GNUNET_MESH_Data) + /* Payload must be */
3807 sizeof (struct GNUNET_MessageHeader)) /* at least a header */
3809 GNUNET_break_op (0);
3812 msg = (struct GNUNET_MESH_Data *) message;
3813 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " of type %s\n",
3814 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
3815 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3816 pid = ntohl (msg->pid);
3819 /* TODO notify that we dont know this tunnel (whom)? */
3820 GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO);
3821 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3822 "Received to_origin with PID %u on unknown tunnel %s [%u]\n",
3823 pid, GNUNET_i2s (&msg->oid), ntohl (msg->tid));
3827 if (GMC_is_pid_bigger (pid, t->next_fc.last_ack_sent))
3829 GNUNET_STATISTICS_update (stats, "# unsolicited to_orig", 1, GNUNET_NO);
3830 GNUNET_break_op (0);
3831 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3832 "Received PID %u, ACK %u\n",
3833 pid, t->next_fc.last_ack_sent);
3834 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
3838 if (myid == t->id.oid)
3840 /* TODO signature verification */
3841 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3842 " it's for us! sending to clients...\n");
3843 GNUNET_STATISTICS_update (stats, "# to origin received", 1, GNUNET_NO);
3844 if ( (GNUNET_NO == t->reliable &&
3845 GMC_is_pid_bigger(pid, t->next_fc.last_pid_recv))
3847 (GNUNET_YES == t->reliable &&
3848 pid == t->next_fc.last_pid_recv + 1) ) // FIXME use "futures" as accepting
3850 t->next_fc.last_pid_recv = pid;
3851 tunnel_send_client_to_orig (t, msg);
3855 // GNUNET_STATISTICS_update (stats, "# duplicate PID drops BCK", 1, GNUNET_NO);
3856 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3857 " Pid %u not expected, sending FWD ACK!\n", pid);
3859 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK);
3862 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3863 " not for us, retransmitting...\n");
3864 if (GMC_is_pid_bigger (pid, t->next_fc.last_pid_recv))
3865 t->next_fc.last_pid_recv = pid;
3866 if (0 == t->prev_hop) /* No owner AND no prev hop */
3868 if (GNUNET_YES == t->destroy)
3870 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3871 "to orig received on a dying tunnel %s [%X]\n",
3872 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3875 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3876 "unknown to origin at %s\n",
3877 GNUNET_i2s (&my_full_id));
3878 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3881 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3882 "on tunnel %s [%X]\n",
3883 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3886 ttl = ntohl (msg->ttl);
3887 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
3890 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
3891 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
3892 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
3895 send_prebuilt_message (message, t->prev_hop, t);
3896 GNUNET_STATISTICS_update (stats, "# to origin forwarded", 1, GNUNET_NO);
3903 * Core handler for mesh network traffic end-to-end ACKs.
3905 * @param cls Closure.
3906 * @param message Message.
3907 * @param peer Peer identity this notification is about.
3909 * @return GNUNET_OK to keep the connection open,
3910 * GNUNET_SYSERR to close it (signal serious error)
3913 handle_mesh_data_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
3914 const struct GNUNET_MessageHeader *message)
3916 struct GNUNET_MESH_DataACK *msg;
3917 struct MeshTunnelReliability *rel;
3918 struct MeshReliableMessage *copy;
3919 struct MeshReliableMessage *next;
3920 struct MeshTunnel *t;
3926 type = ntohs (message->type);
3927 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a %s message from %s!\n",
3928 GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer));
3929 msg = (struct GNUNET_MESH_DataACK *) message;
3931 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3934 /* TODO notify that we dont know this tunnel (whom)? */
3935 GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO);
3938 ack = ntohl (msg->pid);
3939 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
3941 /* Is this a forward or backward ACK? */
3942 id = GNUNET_PEER_search (peer);
3943 if (t->next_hop == id && GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK == type)
3945 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
3946 if (NULL == t->owner)
3948 send_prebuilt_message (message, t->prev_hop, t);
3952 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST);
3954 else if (t->prev_hop == id && GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK == type)
3956 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
3957 if (NULL == t->client)
3959 send_prebuilt_message (message, t->next_hop, t);
3963 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
3967 GNUNET_break_op (0);
3971 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! ACK %u\n", ack);
3972 for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next)
3974 struct GNUNET_TIME_Relative time;
3978 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! head %u, out!\n", copy->id);
3982 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! id %u\n", copy->id);
3984 time = GNUNET_TIME_absolute_get_duration (copy->timestamp);
3985 rel->expected_delay.rel_value += time.rel_value;
3986 rel->expected_delay.rel_value /= 2;
3987 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! new expected delay %s\n",
3988 GNUNET_STRINGS_relative_time_to_string (rel->expected_delay,
3990 rel->retry_timer = rel->expected_delay;
3991 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
3995 if (GNUNET_YES == work)
3997 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
3999 GNUNET_SCHEDULER_cancel (rel->retry_task);
4000 if (NULL == rel->head_sent)
4002 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
4006 struct GNUNET_TIME_Absolute new_target;
4007 struct GNUNET_TIME_Relative delay;
4009 new_target = GNUNET_TIME_absolute_add (rel->head_sent->timestamp,
4011 delay = GNUNET_TIME_absolute_get_remaining (new_target);
4013 GNUNET_SCHEDULER_add_delayed (delay,
4014 &tunnel_retransmit_message,
4025 * Core handler for mesh network traffic point-to-point acks.
4027 * @param cls closure
4028 * @param message message
4029 * @param peer peer identity this notification is about
4031 * @return GNUNET_OK to keep the connection open,
4032 * GNUNET_SYSERR to close it (signal serious error)
4035 handle_mesh_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
4036 const struct GNUNET_MessageHeader *message)
4038 struct GNUNET_MESH_ACK *msg;
4039 struct MeshTunnel *t;
4040 struct MeshFlowControl *fc;
4044 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
4046 msg = (struct GNUNET_MESH_ACK *) message;
4048 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4052 /* TODO notify that we dont know this tunnel (whom)? */
4053 GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO);
4056 ack = ntohl (msg->pid);
4057 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
4059 /* Is this a forward or backward ACK? */
4060 id = GNUNET_PEER_search (peer);
4061 if (t->next_hop == id)
4064 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
4067 else if (t->prev_hop == id)
4070 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
4075 GNUNET_break_op (0);
4079 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task &&
4080 GMC_is_pid_bigger (ack, fc->last_ack_recv))
4082 GNUNET_SCHEDULER_cancel (fc->poll_task);
4083 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
4084 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
4086 fc->last_ack_recv = ack;
4087 peer_unlock_queue (id);
4089 if (t->next_hop == id)
4090 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
4092 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
4099 * Core handler for mesh network traffic point-to-point ack polls.
4101 * @param cls closure
4102 * @param message message
4103 * @param peer peer identity this notification is about
4105 * @return GNUNET_OK to keep the connection open,
4106 * GNUNET_SYSERR to close it (signal serious error)
4109 handle_mesh_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
4110 const struct GNUNET_MessageHeader *message)
4112 struct GNUNET_MESH_Poll *msg;
4113 struct MeshTunnel *t;
4114 struct MeshFlowControl *fc;
4119 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an POLL packet from %s!\n",
4122 msg = (struct GNUNET_MESH_Poll *) message;
4124 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4128 /* TODO notify that we dont know this tunnel (whom)? */
4129 GNUNET_STATISTICS_update (stats, "# poll on unknown tunnel", 1, GNUNET_NO);
4130 GNUNET_break_op (0);
4134 /* Is this a forward or backward ACK? */
4135 id = GNUNET_PEER_search(peer);
4136 pid = ntohl (msg->pid);
4137 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PID %u\n", pid);
4138 if (t->next_hop == id)
4140 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from FWD\n");
4141 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " was %u\n", t->next_fc.last_pid_recv);
4143 old = fc->last_pid_recv;
4144 fc->last_pid_recv = pid;
4145 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
4147 else if (t->prev_hop == id)
4149 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from BCK\n");
4150 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " was %u\n", t->prev_fc.last_pid_recv);
4152 old = fc->last_pid_recv;
4153 fc->last_pid_recv = pid;
4154 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
4159 if (GNUNET_YES == t->reliable)
4160 fc->last_pid_recv = old;
4167 * Core handler for mesh keepalives.
4169 * @param cls closure
4170 * @param message message
4171 * @param peer peer identity this notification is about
4172 * @return GNUNET_OK to keep the connection open,
4173 * GNUNET_SYSERR to close it (signal serious error)
4175 * TODO: Check who we got this from, to validate route.
4178 handle_mesh_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
4179 const struct GNUNET_MessageHeader *message)
4181 struct GNUNET_MESH_TunnelKeepAlive *msg;
4182 struct MeshTunnel *t;
4184 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
4187 msg = (struct GNUNET_MESH_TunnelKeepAlive *) message;
4188 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4192 /* TODO notify that we dont know that tunnel */
4193 GNUNET_STATISTICS_update (stats, "# keepalive on unknown tunnel", 1,
4198 tunnel_reset_timeout (t);
4199 if (NULL != t->client || 0 == t->next_hop || myid == t->next_hop)
4202 GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
4203 send_prebuilt_message (message, t->next_hop, t);
4210 * Functions to handle messages from core
4212 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
4213 {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0},
4214 {&handle_mesh_path_broken, GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN,
4215 sizeof (struct GNUNET_MESH_PathBroken)},
4216 {&handle_mesh_tunnel_destroy, GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY,
4217 sizeof (struct GNUNET_MESH_TunnelDestroy)},
4218 {&handle_mesh_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
4219 {&handle_mesh_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
4220 {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK,
4221 sizeof (struct GNUNET_MESH_DataACK)},
4222 {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK,
4223 sizeof (struct GNUNET_MESH_DataACK)},
4224 {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE,
4225 sizeof (struct GNUNET_MESH_TunnelKeepAlive)},
4226 {&handle_mesh_ack, GNUNET_MESSAGE_TYPE_MESH_ACK,
4227 sizeof (struct GNUNET_MESH_ACK)},
4228 {&handle_mesh_poll, GNUNET_MESSAGE_TYPE_MESH_POLL,
4229 sizeof (struct GNUNET_MESH_Poll)},
4230 {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
4231 sizeof (struct GNUNET_MESH_PathACK)},
4237 /******************************************************************************/
4238 /**************** MESH LOCAL HANDLER HELPERS ***********************/
4239 /******************************************************************************/
4244 * notify_client_connection_failure: notify a client that the connection to the
4245 * requested remote peer is not possible (for instance, no route found)
4246 * Function called when the socket is ready to queue more data. "buf" will be
4247 * NULL and "size" zero if the socket was closed for writing in the meantime.
4249 * @param cls closure
4250 * @param size number of bytes available in buf
4251 * @param buf where the callee should write the message
4252 * @return number of bytes written to buf
4255 notify_client_connection_failure (void *cls, size_t size, void *buf)
4258 struct MeshPeerInfo *peer_info;
4259 struct GNUNET_MESH_PeerControl *msg;
4260 struct GNUNET_PeerIdentity id;
4262 if (0 == size && NULL == buf)
4264 // TODO retry? cancel?
4268 size_needed = sizeof (struct GNUNET_MESH_PeerControl);
4269 peer_info = (struct MeshPeerInfo *) cls;
4270 msg = (struct GNUNET_MESH_PeerControl *) buf;
4271 msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
4272 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED);
4273 // msg->tunnel_id = htonl(peer_info->t->tid);
4274 GNUNET_PEER_resolve (peer_info->id, &id);
4275 memcpy (&msg->peer, &id, sizeof (struct GNUNET_PeerIdentity));
4283 * Send keepalive packets for a tunnel.
4285 * @param cls Closure (tunnel for which to send the keepalive).
4286 * @param tc Notification context.
4288 * FIXME: add a refresh reset in case of normal unicast traffic is doing the job
4291 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4293 struct MeshTunnel *t = cls;
4294 struct GNUNET_MESH_TunnelKeepAlive *msg;
4295 size_t size = sizeof (struct GNUNET_MESH_TunnelKeepAlive);
4298 t->maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4299 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) ||
4300 NULL == t->owner || 0 == t->local_tid)
4305 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4306 "sending keepalive for tunnel %d\n", t->id.tid);
4308 msg = (struct GNUNET_MESH_TunnelKeepAlive *) cbuf;
4309 msg->header.size = htons (size);
4310 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE);
4311 msg->oid = my_full_id;
4312 msg->tid = htonl (t->id.tid);
4313 send_prebuilt_message (&msg->header, t->next_hop, t);
4315 t->maintenance_task =
4316 GNUNET_SCHEDULER_add_delayed (refresh_path_time, &path_refresh, t);
4321 * Function to process paths received for a new peer addition. The recorded
4322 * paths form the initial tunnel, which can be optimized later.
4323 * Called on each result obtained for the DHT search.
4325 * @param cls closure
4326 * @param exp when will this value expire
4327 * @param key key of the result
4328 * @param get_path path of the get request
4329 * @param get_path_length lenght of get_path
4330 * @param put_path path of the put request
4331 * @param put_path_length length of the put_path
4332 * @param type type of the result
4333 * @param size number of bytes in data
4334 * @param data pointer to the result data
4337 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
4338 const struct GNUNET_HashCode * key,
4339 const struct GNUNET_PeerIdentity *get_path,
4340 unsigned int get_path_length,
4341 const struct GNUNET_PeerIdentity *put_path,
4342 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
4343 size_t size, const void *data)
4345 struct MeshPeerInfo *peer = cls;
4346 struct MeshPeerPath *p;
4347 struct GNUNET_PeerIdentity pi;
4350 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got results from DHT!\n");
4351 GNUNET_PEER_resolve (peer->id, &pi);
4352 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&pi));
4354 p = path_build_from_dht (get_path, get_path_length,
4355 put_path, put_path_length);
4356 path_add_to_peers (p, GNUNET_NO);
4358 for (i = 0; i < peer->ntunnels; i++)
4360 struct GNUNET_PeerIdentity id;
4362 GNUNET_PEER_resolve (peer->tunnels[i]->id.oid, &id);
4363 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... tunnel %s:%X (%X / %X)\n",
4364 GNUNET_i2s (&id), peer->tunnels[i]->id.tid,
4365 peer->tunnels[i]->local_tid,
4366 peer->tunnels[i]->local_tid_dest);
4367 if (peer->tunnels[i]->state == MESH_TUNNEL_SEARCHING)
4369 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
4370 peer_connect (peer, peer->tunnels[i]);
4378 /******************************************************************************/
4379 /********************* MESH LOCAL HANDLES **************************/
4380 /******************************************************************************/
4384 * Handler for client disconnection
4386 * @param cls closure
4387 * @param client identification of the client; NULL
4388 * for the last call when the server is destroyed
4391 handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
4393 struct MeshClient *c;
4394 struct MeshClient *next;
4396 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected: %p\n", client);
4399 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (SERVER DOWN)\n");
4403 c = client_get (client);
4406 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "matching client found (%u)\n",
4408 GNUNET_SERVER_client_drop (c->handle);
4409 c->shutting_down = GNUNET_YES;
4410 GNUNET_CONTAINER_multihashmap32_iterate (c->own_tunnels,
4411 &tunnel_destroy_iterator, c);
4412 GNUNET_CONTAINER_multihashmap32_iterate (c->incoming_tunnels,
4413 &tunnel_destroy_iterator, c);
4414 GNUNET_CONTAINER_multihashmap32_destroy (c->own_tunnels);
4415 GNUNET_CONTAINER_multihashmap32_destroy (c->incoming_tunnels);
4417 if (NULL != c->ports)
4418 GNUNET_CONTAINER_multihashmap32_destroy (c->ports);
4420 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, c);
4421 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " CLIENT FREE at %p\n", c);
4423 GNUNET_STATISTICS_update (stats, "# clients", -1, GNUNET_NO);
4428 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " context NULL!\n");
4430 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "done!\n");
4436 * Handler for new clients
4438 * @param cls closure
4439 * @param client identification of the client
4440 * @param message the actual message, which includes messages the client wants
4443 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
4444 const struct GNUNET_MessageHeader *message)
4446 struct GNUNET_MESH_ClientConnect *cc_msg;
4447 struct MeshClient *c;
4452 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client connected %p\n", client);
4454 /* Check data sanity */
4455 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
4456 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
4457 if (0 != (size % sizeof (uint32_t)))
4460 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4463 size /= sizeof (uint32_t);
4465 /* Create new client structure */
4466 c = GNUNET_malloc (sizeof (struct MeshClient));
4467 c->id = next_client_id++; /* overflow not important: just for debug */
4468 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client id %u\n", c->id);
4469 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client has %u ports\n", size);
4471 GNUNET_SERVER_client_keep (client);
4472 GNUNET_SERVER_client_set_user_context (client, c);
4477 p = (uint32_t *) &cc_msg[1];
4478 c->ports = GNUNET_CONTAINER_multihashmap32_create (size);
4479 for (i = 0; i < size; i++)
4482 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port: %u\n", u32);
4484 /* store in client's hashmap */
4485 GNUNET_CONTAINER_multihashmap32_put (c->ports, u32, c,
4486 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
4487 /* store in global hashmap */
4488 /* FIXME only allow one client to have the port open,
4489 * have a backup hashmap with waiting clients */
4490 GNUNET_CONTAINER_multihashmap32_put (ports, u32, c,
4491 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
4495 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, c);
4496 c->own_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
4497 c->incoming_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
4498 GNUNET_SERVER_notification_context_add (nc, client);
4499 GNUNET_STATISTICS_update (stats, "# clients", 1, GNUNET_NO);
4501 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4502 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client processed\n");
4507 * Handler for requests of new tunnels
4509 * @param cls Closure.
4510 * @param client Identification of the client.
4511 * @param message The actual message.
4514 handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client,
4515 const struct GNUNET_MessageHeader *message)
4517 struct GNUNET_MESH_TunnelMessage *t_msg;
4518 struct MeshPeerInfo *peer_info;
4519 struct MeshTunnel *t;
4520 struct MeshClient *c;
4521 MESH_TunnelNumber tid;
4523 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new tunnel requested\n");
4525 /* Sanity check for client registration */
4526 if (NULL == (c = client_get (client)))
4529 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4534 /* Message size sanity check */
4535 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
4538 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4542 t_msg = (struct GNUNET_MESH_TunnelMessage *) message;
4543 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n",
4544 GNUNET_i2s (&t_msg->peer));
4545 /* Sanity check for tunnel numbering */
4546 tid = ntohl (t_msg->tunnel_id);
4547 if (0 == (tid & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI))
4550 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4553 /* Sanity check for duplicate tunnel IDs */
4554 if (NULL != tunnel_get_by_local_id (c, tid))
4557 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4562 while (NULL != tunnel_get_by_pi (myid, next_tid))
4563 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
4564 t = tunnel_new (myid, next_tid, c, tid);
4565 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
4569 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4572 t->port = ntohl (t_msg->port);
4573 tunnel_set_options (t, ntohl (t_msg->options));
4574 if (GNUNET_YES == t->reliable)
4576 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
4577 t->fwd_rel = GNUNET_malloc (sizeof (struct MeshTunnelReliability));
4579 t->fwd_rel->expected_delay = MESH_RETRANSMIT_TIME;
4582 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATED TUNNEL %s[%x]:%u (%x)\n",
4583 GNUNET_i2s (&my_full_id), t->id.tid, t->port, t->local_tid);
4585 peer_info = peer_get (&t_msg->peer);
4586 peer_info_add_tunnel (peer_info, t);
4587 peer_connect (peer_info, t);
4588 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4594 * Handler for requests of deleting tunnels
4596 * @param cls closure
4597 * @param client identification of the client
4598 * @param message the actual message
4601 handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
4602 const struct GNUNET_MessageHeader *message)
4604 struct GNUNET_MESH_TunnelMessage *tunnel_msg;
4605 struct MeshClient *c;
4606 struct MeshTunnel *t;
4607 MESH_TunnelNumber tid;
4609 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4610 "Got a DESTROY TUNNEL from client!\n");
4612 /* Sanity check for client registration */
4613 if (NULL == (c = client_get (client)))
4616 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4619 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4621 /* Message sanity check */
4622 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
4625 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4629 tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message;
4631 /* Retrieve tunnel */
4632 tid = ntohl (tunnel_msg->tunnel_id);
4633 t = tunnel_get_by_local_id(c, tid);
4636 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " tunnel %X not found\n", tid);
4638 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4642 /* Cleanup after the tunnel */
4643 client_delete_tunnel (c, t);
4650 peer_info_remove_tunnel (peer_get_short (t->dest), t);
4654 /* The tunnel will be destroyed when the last message is transmitted. */
4655 tunnel_destroy_empty (t);
4657 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4663 * Handler for client traffic
4665 * @param cls closure
4666 * @param client identification of the client
4667 * @param message the actual message
4670 handle_local_data (void *cls, struct GNUNET_SERVER_Client *client,
4671 const struct GNUNET_MessageHeader *message)
4673 struct GNUNET_MESH_LocalData *data_msg;
4674 struct MeshClient *c;
4675 struct MeshTunnel *t;
4676 struct MeshFlowControl *fc;
4677 MESH_TunnelNumber tid;
4680 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4681 "Got data from a client!\n");
4683 /* Sanity check for client registration */
4684 if (NULL == (c = client_get (client)))
4687 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4690 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4692 data_msg = (struct GNUNET_MESH_LocalData *) message;
4694 /* Sanity check for message size */
4695 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_LocalData);
4696 if (size < sizeof (struct GNUNET_MessageHeader))
4699 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4703 /* Tunnel exists? */
4704 tid = ntohl (data_msg->tid);
4705 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI)
4708 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4711 t = tunnel_get_by_local_id (c, tid);
4715 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4719 /* Is the client in the tunnel? */
4720 if ( !( (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV &&
4722 t->owner->handle == client)
4724 (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV &&
4726 t->client->handle == client) ) )
4729 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4733 /* Ok, everything is correct, send the message
4734 * (pretend we got it from a mesh peer)
4737 struct GNUNET_MESH_Data *payload;
4738 char cbuf[sizeof(struct GNUNET_MESH_Data) + size];
4740 fc = tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV ? &t->prev_fc : &t->next_fc;
4741 if (GNUNET_YES == t->reliable)
4743 struct MeshTunnelReliability *rel;
4744 struct MeshReliableMessage *copy;
4746 copy = GNUNET_malloc (sizeof (struct MeshReliableMessage)
4747 + sizeof(struct GNUNET_MESH_Data)
4749 copy->id = fc->last_pid_recv + 1;
4750 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! DATA %u\n", copy->id);
4751 copy->timestamp = GNUNET_TIME_absolute_get ();
4752 rel = (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) ? t->fwd_rel : t->bck_rel;
4754 GNUNET_CONTAINER_DLL_insert_tail (rel->head_sent, rel->tail_sent, copy);
4755 if (GNUNET_SCHEDULER_NO_TASK == rel->retry_task)
4757 rel->retry_timer = rel->expected_delay;
4759 GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
4760 &tunnel_retransmit_message,
4763 payload = (struct GNUNET_MESH_Data *) ©[1];
4767 payload = (struct GNUNET_MESH_Data *) cbuf;
4769 memcpy (&payload[1], &data_msg[1], size);
4770 payload->header.size = htons (sizeof (struct GNUNET_MESH_Data) + size);
4771 payload->header.type = htons (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV ?
4772 GNUNET_MESSAGE_TYPE_MESH_UNICAST :
4773 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
4774 GNUNET_PEER_resolve(t->id.oid, &payload->oid);;
4775 payload->tid = htonl (t->id.tid);
4776 payload->ttl = htonl (default_ttl);
4777 payload->pid = htonl (fc->last_pid_recv + 1);
4778 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4779 " calling generic handler...\n");
4780 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
4781 handle_mesh_unicast (NULL, &my_full_id, &payload->header);
4783 handle_mesh_to_orig (NULL, &my_full_id, &payload->header);
4785 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "receive done OK\n");
4786 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4793 * Handler for client's ACKs for payload traffic.
4795 * @param cls Closure (unused).
4796 * @param client Identification of the client.
4797 * @param message The actual message.
4800 handle_local_ack (void *cls, struct GNUNET_SERVER_Client *client,
4801 const struct GNUNET_MessageHeader *message)
4803 struct GNUNET_MESH_LocalAck *msg;
4804 struct MeshTunnel *t;
4805 struct MeshClient *c;
4806 MESH_TunnelNumber tid;
4808 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a local ACK\n");
4809 /* Sanity check for client registration */
4810 if (NULL == (c = client_get (client)))
4813 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4816 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4818 msg = (struct GNUNET_MESH_LocalAck *) message;
4820 /* Tunnel exists? */
4821 tid = ntohl (msg->tunnel_id);
4822 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", tid);
4823 t = tunnel_get_by_local_id (c, tid);
4827 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Tunnel %X unknown.\n", tid);
4828 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id);
4829 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4833 /* Does client own tunnel? I.E: Is this an ACK for BCK traffic? */
4836 /* The client owns the tunnel, ACK is for data to_origin, send BCK ACK. */
4837 t->prev_fc.last_ack_recv++;
4838 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
4842 /* The client doesn't own the tunnel, this ACK is for FWD traffic. */
4843 t->next_fc.last_ack_recv++;
4844 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
4847 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4855 * Iterator over all tunnels to send a monitoring client info about each tunnel.
4857 * @param cls Closure (client handle).
4858 * @param key Key (hashed tunnel ID, unused).
4859 * @param value Tunnel info.
4861 * @return GNUNET_YES, to keep iterating.
4864 monitor_all_tunnels_iterator (void *cls,
4865 const struct GNUNET_HashCode * key,
4868 struct GNUNET_SERVER_Client *client = cls;
4869 struct MeshTunnel *t = value;
4870 struct GNUNET_MESH_LocalMonitor *msg;
4872 msg = GNUNET_malloc (sizeof(struct GNUNET_MESH_LocalMonitor));
4873 GNUNET_PEER_resolve(t->id.oid, &msg->owner);
4874 msg->tunnel_id = htonl (t->id.tid);
4875 msg->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
4876 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS);
4877 GNUNET_PEER_resolve (t->dest, &msg->destination);
4879 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4880 "* sending info about tunnel %s [%u]\n",
4881 GNUNET_i2s (&msg->owner), t->id.tid);
4883 GNUNET_SERVER_notification_context_unicast (nc, client,
4884 &msg->header, GNUNET_NO);
4890 * Handler for client's MONITOR request.
4892 * @param cls Closure (unused).
4893 * @param client Identification of the client.
4894 * @param message The actual message.
4897 handle_local_get_tunnels (void *cls, struct GNUNET_SERVER_Client *client,
4898 const struct GNUNET_MessageHeader *message)
4900 struct MeshClient *c;
4902 /* Sanity check for client registration */
4903 if (NULL == (c = client_get (client)))
4906 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4910 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4911 "Received get tunnels request from client %u\n",
4913 GNUNET_CONTAINER_multihashmap_iterate (tunnels,
4914 monitor_all_tunnels_iterator,
4916 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4917 "Get tunnels request from client %u completed\n",
4919 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4924 * Handler for client's MONITOR_TUNNEL request.
4926 * @param cls Closure (unused).
4927 * @param client Identification of the client.
4928 * @param message The actual message.
4931 handle_local_show_tunnel (void *cls, struct GNUNET_SERVER_Client *client,
4932 const struct GNUNET_MessageHeader *message)
4934 const struct GNUNET_MESH_LocalMonitor *msg;
4935 struct GNUNET_MESH_LocalMonitor *resp;
4936 struct MeshClient *c;
4937 struct MeshTunnel *t;
4939 /* Sanity check for client registration */
4940 if (NULL == (c = client_get (client)))
4943 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4947 msg = (struct GNUNET_MESH_LocalMonitor *) message;
4948 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4949 "Received tunnel info request from client %u for tunnel %s[%X]\n",
4952 ntohl (msg->tunnel_id));
4953 t = tunnel_get (&msg->owner, ntohl (msg->tunnel_id));
4956 /* We don't know the tunnel FIXME */
4957 struct GNUNET_MESH_LocalMonitor warn;
4960 GNUNET_SERVER_notification_context_unicast (nc, client,
4963 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4967 /* Initialize context */
4968 resp = GNUNET_malloc (sizeof (struct GNUNET_MESH_LocalMonitor));
4970 GNUNET_PEER_resolve (t->dest, &resp->destination);
4971 resp->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
4972 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
4973 &resp->header, GNUNET_NO);
4976 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4977 "Monitor tunnel request from client %u completed\n",
4979 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4984 * Functions to handle messages from clients
4986 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
4987 {&handle_local_new_client, NULL,
4988 GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
4989 {&handle_local_tunnel_create, NULL,
4990 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE,
4991 sizeof (struct GNUNET_MESH_TunnelMessage)},
4992 {&handle_local_tunnel_destroy, NULL,
4993 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY,
4994 sizeof (struct GNUNET_MESH_TunnelMessage)},
4995 {&handle_local_data, NULL,
4996 GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA, 0},
4997 {&handle_local_ack, NULL,
4998 GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK,
4999 sizeof (struct GNUNET_MESH_LocalAck)},
5000 {&handle_local_get_tunnels, NULL,
5001 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS,
5002 sizeof (struct GNUNET_MessageHeader)},
5003 {&handle_local_show_tunnel, NULL,
5004 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL,
5005 sizeof (struct GNUNET_MESH_LocalMonitor)},
5011 * Method called whenever a given peer connects.
5013 * @param cls closure
5014 * @param peer peer identity this notification is about
5017 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
5019 struct MeshPeerInfo *peer_info;
5020 struct MeshPeerPath *path;
5022 DEBUG_CONN ("Peer connected\n");
5023 DEBUG_CONN (" %s\n", GNUNET_i2s (&my_full_id));
5024 peer_info = peer_get (peer);
5025 if (myid == peer_info->id)
5027 DEBUG_CONN (" (self)\n");
5028 path = path_new (1);
5032 DEBUG_CONN (" %s\n", GNUNET_i2s (peer));
5033 path = path_new (2);
5034 path->peers[1] = peer_info->id;
5035 GNUNET_PEER_change_rc (peer_info->id, 1);
5036 GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO);
5038 path->peers[0] = myid;
5039 GNUNET_PEER_change_rc (myid, 1);
5040 peer_info_add_path (peer_info, path, GNUNET_YES);
5046 * Method called whenever a peer disconnects.
5048 * @param cls closure
5049 * @param peer peer identity this notification is about
5052 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
5054 struct MeshPeerInfo *pi;
5055 struct MeshPeerQueue *q;
5056 struct MeshPeerQueue *n;
5058 DEBUG_CONN ("Peer disconnected\n");
5059 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
5069 /* TODO try to reroute this traffic instead */
5070 queue_destroy(q, GNUNET_YES);
5073 if (NULL != pi->core_transmit)
5075 GNUNET_CORE_notify_transmit_ready_cancel(pi->core_transmit);
5076 pi->core_transmit = NULL;
5078 peer_remove_path (pi, pi->id, myid);
5081 DEBUG_CONN (" (self)\n");
5083 GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO);
5089 * Install server (service) handlers and start listening to clients.
5094 GNUNET_SERVER_add_handlers (server_handle, client_handlers);
5095 GNUNET_SERVER_disconnect_notify (server_handle,
5096 &handle_local_client_disconnect, NULL);
5097 nc = GNUNET_SERVER_notification_context_create (server_handle, 1);
5099 clients_head = NULL;
5100 clients_tail = NULL;
5102 GNUNET_SERVER_resume (server_handle);
5107 * To be called on core init/fail.
5109 * @param cls Closure (config)
5110 * @param server handle to the server for this service
5111 * @param identity the public identity of this peer
5114 core_init (void *cls, struct GNUNET_CORE_Handle *server,
5115 const struct GNUNET_PeerIdentity *identity)
5117 const struct GNUNET_CONFIGURATION_Handle *c = cls;
5120 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
5121 GNUNET_break (core_handle == server);
5122 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)) ||
5125 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
5126 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5128 GNUNET_i2s (identity));
5129 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5131 GNUNET_i2s (&my_full_id));
5132 GNUNET_CORE_disconnect (core_handle);
5133 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
5134 NULL, /* Closure passed to MESH functions */
5135 &core_init, /* Call core_init once connected */
5136 &core_connect, /* Handle connects */
5137 &core_disconnect, /* remove peers on disconnects */
5138 NULL, /* Don't notify about all incoming messages */
5139 GNUNET_NO, /* For header only in notification */
5140 NULL, /* Don't notify about all outbound messages */
5141 GNUNET_NO, /* For header-only out notification */
5142 core_handlers); /* Register these handlers */
5151 /******************************************************************************/
5152 /************************ MAIN FUNCTIONS ****************************/
5153 /******************************************************************************/
5156 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
5158 * @param cls closure
5159 * @param key current key code
5160 * @param value value in the hash map
5161 * @return GNUNET_YES if we should continue to iterate,
5165 shutdown_tunnel (void *cls, const struct GNUNET_HashCode * key, void *value)
5167 struct MeshTunnel *t = value;
5174 * Iterator over peer hash map entries to destroy the tunnel during shutdown.
5176 * @param cls closure
5177 * @param key current key code
5178 * @param value value in the hash map
5179 * @return GNUNET_YES if we should continue to iterate,
5183 shutdown_peer (void *cls, const struct GNUNET_HashCode * key, void *value)
5185 struct MeshPeerInfo *p = value;
5186 struct MeshPeerQueue *q;
5187 struct MeshPeerQueue *n;
5195 queue_destroy(q, GNUNET_YES);
5199 peer_info_destroy (p);
5205 * Task run during shutdown.
5211 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
5213 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n");
5215 if (core_handle != NULL)
5217 GNUNET_CORE_disconnect (core_handle);
5220 GNUNET_CONTAINER_multihashmap_iterate (tunnels, &shutdown_tunnel, NULL);
5221 GNUNET_CONTAINER_multihashmap_iterate (peers, &shutdown_peer, NULL);
5222 if (dht_handle != NULL)
5224 GNUNET_DHT_disconnect (dht_handle);
5229 GNUNET_SERVER_notification_context_destroy (nc);
5232 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
5234 GNUNET_SCHEDULER_cancel (announce_id_task);
5235 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
5237 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shut down\n");
5242 * Process mesh requests.
5244 * @param cls closure
5245 * @param server the initialized server
5246 * @param c configuration to use
5249 run (void *cls, struct GNUNET_SERVER_Handle *server,
5250 const struct GNUNET_CONFIGURATION_Handle *c)
5253 struct GNUNET_CRYPTO_EccPrivateKey *pk;
5255 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n");
5256 server_handle = server;
5257 GNUNET_SERVER_suspend (server_handle);
5260 GNUNET_CONFIGURATION_get_value_filename (c, "PEER", "PRIVATE_KEY",
5263 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5265 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5266 "mesh", "peer/privatekey");
5267 GNUNET_SCHEDULER_shutdown ();
5272 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_PATH_TIME",
5273 &refresh_path_time))
5275 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5277 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5278 "mesh", "refresh path time");
5279 GNUNET_SCHEDULER_shutdown ();
5284 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "ID_ANNOUNCE_TIME",
5287 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5289 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5290 "mesh", "id announce time");
5291 GNUNET_SCHEDULER_shutdown ();
5296 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "CONNECT_TIMEOUT",
5299 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5301 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5302 "mesh", "connect timeout");
5303 GNUNET_SCHEDULER_shutdown ();
5308 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
5311 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5313 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5314 "mesh", "max msgs queue");
5315 GNUNET_SCHEDULER_shutdown ();
5320 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_TUNNELS",
5323 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5325 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5326 "mesh", "max tunnels");
5327 GNUNET_SCHEDULER_shutdown ();
5332 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
5335 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5337 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5338 "mesh", "default ttl", 64);
5343 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_PEERS",
5346 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5347 _("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5348 "mesh", "max peers", 1000);
5353 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DROP_PERCENT",
5360 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5361 "Mesh is running with drop mode enabled. "
5362 "This is NOT a good idea! "
5363 "Remove the DROP_PERCENT option from your configuration.\n");
5367 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DHT_REPLICATION_LEVEL",
5368 &dht_replication_level))
5370 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5372 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5373 "mesh", "dht replication level", 3);
5374 dht_replication_level = 3;
5377 tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
5378 incoming_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
5379 peers = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
5380 ports = GNUNET_CONTAINER_multihashmap32_create (32);
5382 dht_handle = GNUNET_DHT_connect (c, 64);
5383 if (NULL == dht_handle)
5387 stats = GNUNET_STATISTICS_create ("mesh", c);
5389 /* Scheduled the task to clean up when shutdown is called */
5390 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
5392 pk = GNUNET_CRYPTO_ecc_key_create_from_file (keyfile);
5393 GNUNET_free (keyfile);
5394 GNUNET_assert (NULL != pk);
5395 my_private_key = pk;
5396 GNUNET_CRYPTO_ecc_key_get_public (my_private_key, &my_public_key);
5397 GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
5398 &my_full_id.hashPubKey);
5399 myid = GNUNET_PEER_intern (&my_full_id);
5400 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5401 "Mesh for peer [%s] starting\n",
5402 GNUNET_i2s(&my_full_id));
5404 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
5405 NULL, /* Closure passed to MESH functions */
5406 &core_init, /* Call core_init once connected */
5407 &core_connect, /* Handle connects */
5408 &core_disconnect, /* remove peers on disconnects */
5409 NULL, /* Don't notify about all incoming messages */
5410 GNUNET_NO, /* For header only in notification */
5411 NULL, /* Don't notify about all outbound messages */
5412 GNUNET_NO, /* For header-only out notification */
5413 core_handlers); /* Register these handlers */
5414 if (NULL == core_handle)
5417 GNUNET_SCHEDULER_shutdown ();
5421 next_local_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
5422 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
5423 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mesh service running\n");
5428 * The main function for the mesh service.
5430 * @param argc number of arguments from the command line
5431 * @param argv command line arguments
5432 * @return 0 ok, 1 on error
5435 main (int argc, char *const *argv)
5440 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main()\n");
5441 r = GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
5443 ret = (GNUNET_OK == r) ? 0 : 1;
5444 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main() END\n");
5448 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5449 "Mesh for peer [%s] FWD ACKs %u, BCK ACKs %u\n",
5450 GNUNET_i2s(&my_full_id), debug_fwd_ack, debug_bck_ack);