2 This file is part of GNUnet.
3 (C) 2001-2013 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file mesh/gnunet-service-mesh.c
23 * @brief GNUnet MESH service
24 * @author Bartlomiej Polot
27 * - keep queues until receiving ACK
30 * - relay corking down to core
31 * - set ttl relative to path length
39 #include "mesh_protocol.h"
40 #include "mesh_path.h"
41 #include "block_mesh.h"
42 #include "gnunet_dht_service.h"
43 #include "gnunet_statistics_service.h"
45 #define MESH_BLOOM_SIZE 128
47 #define MESH_DEBUG_DHT GNUNET_NO
48 #define MESH_DEBUG_CONNECTION GNUNET_NO
49 #define MESH_DEBUG_TIMING __LINUX__ && GNUNET_NO
51 #define MESH_MAX_POLL_TIME GNUNET_TIME_relative_multiply (\
52 GNUNET_TIME_UNIT_MINUTES,\
54 #define MESH_RETRANSMIT_TIME GNUNET_TIME_UNIT_SECONDS
55 #define MESH_RETRANSMIT_MARGIN 4
57 #if MESH_DEBUG_CONNECTION
58 #define DEBUG_CONN(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
60 #define DEBUG_CONN(...)
64 #define DEBUG_DHT(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
66 #define DEBUG_DHT(...)
73 struct timespec __mesh_start;
74 struct timespec __mesh_end;
75 #define INTERVAL_START clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_start))
76 #define INTERVAL_END \
78 clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_end));\
79 double __diff = __mesh_end.tv_nsec - __mesh_start.tv_nsec;\
80 if (__diff < 0) __diff += 1000000000;\
84 #define INTERVAL_SHOW \
86 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "AVG process time: %f ns\n", __sum/__count)
88 #define INTERVAL_START
93 /******************************************************************************/
94 /************************ DATA STRUCTURES ****************************/
95 /******************************************************************************/
97 /** FWD declaration */
103 * Struct containing info about a queued transmission to this peer
110 struct MeshPeerQueue *next;
115 struct MeshPeerQueue *prev;
118 * Peer this transmission is directed to.
120 struct MeshPeerInfo *peer;
123 * Tunnel this message belongs to.
125 struct MeshTunnel *tunnel;
128 * Pointer to info stucture used as cls.
138 * Size of the message
145 * Struct containing all information regarding a given peer
155 * Last time we heard from this peer
157 struct GNUNET_TIME_Absolute last_contact;
160 * Number of attempts to reconnect so far
162 int n_reconnect_attempts;
165 * Paths to reach the peer, ordered by ascending hop count
167 struct MeshPeerPath *path_head;
170 * Paths to reach the peer, ordered by ascending hop count
172 struct MeshPeerPath *path_tail;
175 * Handle to stop the DHT search for a path to this peer
177 struct GNUNET_DHT_GetHandle *dhtget;
180 * Array of tunnels this peer is the target of.
181 * Most probably a small amount, therefore not a hashmap.
182 * When the path to the peer changes, notify these tunnels to let them
183 * re-adjust their path trees.
185 struct MeshTunnel **tunnels;
188 * Number of tunnels this peers participates in
190 unsigned int ntunnels;
193 * Transmission queue to core DLL head
195 struct MeshPeerQueue *queue_head;
198 * Transmission queue to core DLL tail
200 struct MeshPeerQueue *queue_tail;
203 * How many messages are in the queue to this peer.
205 unsigned int queue_n;
208 * Handle for queued transmissions
210 struct GNUNET_CORE_TransmitHandle *core_transmit;
215 * Struct to encapsulate all the Flow Control information to a peer in the
216 * context of a tunnel: Same peer in different tunnels will have independent
217 * flow control structures, allowing to choke/free tunnels according to its
220 struct MeshFlowControl
223 * ID of the last packet sent towards the peer.
225 uint32_t last_pid_sent;
228 * ID of the last packet received from the peer.
230 uint32_t last_pid_recv;
233 * Last ACK sent to the peer (peer can't send more than this PID).
235 uint32_t last_ack_sent;
238 * Last ACK sent towards the origin (for traffic towards leaf node).
240 uint32_t last_ack_recv;
243 * How many payload messages are in the queue towards this peer.
248 * Task to poll the peer in case of a lost ACK causes stall.
250 GNUNET_SCHEDULER_TaskIdentifier poll_task;
253 * How frequently to poll for ACKs.
255 struct GNUNET_TIME_Relative poll_time;
258 * On which tunnel to poll.
259 * Using an explicit poll_ctx would not help memory wise,
260 * since the allocated context would have to be stored in the
261 * fc struct in order to free it upon cancelling poll_task.
263 struct MeshTunnel *t;
268 * Globally unique tunnel identification (owner + number)
269 * DO NOT USE OVER THE NETWORK
274 * Node that owns the tunnel
279 * Tunnel number to differentiate all the tunnels owned by the node oid
280 * ( tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI )
282 MESH_TunnelNumber tid;
287 * Data needed for reliable tunnel endpoint retransmission management.
289 struct MeshTunnelReliability;
293 * Info needed to retry a message in case it gets lost.
295 struct MeshReliableMessage
298 * Double linked list, FIFO style
300 struct MeshReliableMessage *next;
301 struct MeshReliableMessage *prev;
304 * Tunnel Reliability queue this message is in.
306 struct MeshTunnelReliability *rel;
309 * ID of the message (ACK needed to free)
314 * When was this message issued (to calculate ACK delay) FIXME update with traffic
316 struct GNUNET_TIME_Absolute timestamp;
318 /* struct GNUNET_MESH_Data with payload */
322 struct MeshTunnelReliability
325 * Tunnel this is about.
327 struct MeshTunnel *t;
330 * DLL of messages sent and not yet ACK'd.
332 struct MeshReliableMessage *head_sent;
333 struct MeshReliableMessage *tail_sent;
346 * DLL of messages received out of order.
348 struct MeshReliableMessage *head_recv;
349 struct MeshReliableMessage *tail_recv;
357 * Task to resend/poll in case no ACK is received.
359 GNUNET_SCHEDULER_TaskIdentifier retry_task;
362 * Counter for exponential backoff.
364 struct GNUNET_TIME_Relative retry_timer;
367 * How long does it usually take to get an ACK. FIXME update with traffic
369 struct GNUNET_TIME_Relative expected_delay;
374 * Struct containing all information regarding a tunnel
375 * For an intermediate node the improtant info used will be:
376 * - id Tunnel unique identification
377 * - paths[0] To know where to send it next
378 * - metainfo: ready, speeds, accounting
385 struct MESH_TunnelID id;
388 * Port of the tunnel.
393 * State of the tunnel.
395 enum MeshTunnelState state;
398 * Local tunnel number ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI or 0 )
400 MESH_TunnelNumber local_tid;
403 * Local tunnel number for local destination clients (incoming number)
404 * ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV or 0). All clients share the same
407 MESH_TunnelNumber local_tid_dest;
410 * Is the tunnel bufferless (minimum latency)?
415 * Is the tunnel reliable?
420 * Force sending ACK? Flag to allow duplicate ACK on POLL.
425 * How many messages do we accept in the forward queue.
427 unsigned int queue_max;
430 * Last time the tunnel was used
432 struct GNUNET_TIME_Absolute timestamp;
435 * Destination of the tunnel.
440 * Next hop in the tunnel. If 0, @c client must be set.
442 GNUNET_PEER_Id next_hop;
445 * Previous hop in the tunnel. If 0, @c owner must be set.
447 GNUNET_PEER_Id prev_hop;
450 * Flow control information about @c next_hop or @c client.
452 struct MeshFlowControl next_fc;
455 * Flow control information about @c prev_hop or @c owner.
457 struct MeshFlowControl prev_fc;
460 * Client owner of the tunnel, if any
462 struct MeshClient *owner;
465 * Client destination of the tunnel, if any.
467 struct MeshClient *client;
470 * Task to keep the used paths alive at the owner,
471 * time tunnel out on all the other peers.
473 GNUNET_SCHEDULER_TaskIdentifier maintenance_task;
476 * Path being used for the tunnel.
478 struct MeshPeerPath *path;
481 * Flag to signal the destruction of the tunnel.
482 * If this is set GNUNET_YES the tunnel will be destroyed
483 * when the queue is empty.
488 * Total messages pending for this tunnels, payload or not.
490 unsigned int pending_messages;
494 * Only present (non-NULL) at the owner of a tunnel.
496 struct MeshTunnelReliability *fwd_rel;
500 * Only present (non-NULL) at the destination of a tunnel.
502 struct MeshTunnelReliability *bck_rel;
507 * Struct containing information about a client of the service
509 * TODO: add a list of 'waiting' ports
516 struct MeshClient *next;
521 struct MeshClient *prev;
524 * Tunnels that belong to this client, indexed by local id
526 struct GNUNET_CONTAINER_MultiHashMap32 *own_tunnels;
529 * Tunnels this client has accepted, indexed by incoming local id
531 struct GNUNET_CONTAINER_MultiHashMap32 *incoming_tunnels;
534 * Handle to communicate with the client
536 struct GNUNET_SERVER_Client *handle;
539 * Ports that this client has declared interest in.
540 * Indexed by port, contains *Client.
542 struct GNUNET_CONTAINER_MultiHashMap32 *ports;
545 * Whether the client is active or shutting down (don't send confirmations
546 * to a client that is shutting down.
551 * ID of the client, mainly for debug messages
558 /******************************************************************************/
559 /************************ DEBUG FUNCTIONS ****************************/
560 /******************************************************************************/
564 * GNUNET_SCHEDULER_Task for printing a message after some operation is done
565 * @param cls string to print
566 * @param success GNUNET_OK if the PUT was transmitted,
567 * GNUNET_NO on timeout,
568 * GNUNET_SYSERR on disconnect from service
569 * after the PUT message was transmitted
570 * (so we don't know if it was received or not)
575 mesh_debug (void *cls, int success)
579 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%s (%d)\n", s, success);
584 unsigned int debug_fwd_ack;
585 unsigned int debug_bck_ack;
589 /******************************************************************************/
590 /*********************** GLOBAL VARIABLES ****************************/
591 /******************************************************************************/
593 /************************** Configuration parameters **************************/
596 * How often to send tunnel keepalives. Tunnels timeout after 4 missed.
598 static struct GNUNET_TIME_Relative refresh_path_time;
601 * How often to PUT own ID in the DHT.
603 static struct GNUNET_TIME_Relative id_announce_time;
606 * Maximum time allowed to connect to a peer found by string.
608 static struct GNUNET_TIME_Relative connect_timeout;
611 * Default TTL for payload packets.
613 static unsigned long long default_ttl;
616 * DHT replication level, see DHT API: GNUNET_DHT_get_start, GNUNET_DHT_put.
618 static unsigned long long dht_replication_level;
621 * How many tunnels are we willing to maintain.
622 * Local tunnels are always allowed, even if there are more tunnels than max.
624 static unsigned long long max_tunnels;
627 * How many messages *in total* are we willing to queue, divided by number of
628 * tunnels to get tunnel queue size.
630 static unsigned long long max_msgs_queue;
633 * How many peers do we want to remember?
635 static unsigned long long max_peers;
638 * Percentage of messages that will be dropped (for test purposes only).
640 static unsigned long long drop_percent;
642 /*************************** Static global variables **************************/
645 * DLL with all the clients, head.
647 static struct MeshClient *clients_head;
650 * DLL with all the clients, tail.
652 static struct MeshClient *clients_tail;
655 * Tunnels known, indexed by MESH_TunnelID (MeshTunnel).
657 static struct GNUNET_CONTAINER_MultiHashMap *tunnels;
660 * Number of tunnels known.
662 static unsigned long long n_tunnels;
665 * Tunnels incoming, indexed by MESH_TunnelNumber
666 * (which is greater than GNUNET_MESH_LOCAL_TUNNEL_ID_SERV).
668 static struct GNUNET_CONTAINER_MultiHashMap32 *incoming_tunnels;
671 * Peers known, indexed by PeerIdentity (MeshPeerInfo).
673 static struct GNUNET_CONTAINER_MultiHashMap *peers;
676 * Handle to communicate with transport
678 // static struct GNUNET_TRANSPORT_Handle *transport_handle;
681 * Handle to communicate with core.
683 static struct GNUNET_CORE_Handle *core_handle;
688 static struct GNUNET_DHT_Handle *dht_handle;
693 static struct GNUNET_SERVER_Handle *server_handle;
696 * Handle to the statistics service.
698 static struct GNUNET_STATISTICS_Handle *stats;
701 * Notification context, to send messages to local clients.
703 static struct GNUNET_SERVER_NotificationContext *nc;
706 * Local peer own ID (memory efficient handle).
708 static GNUNET_PEER_Id myid;
711 * Local peer own ID (full value).
713 static struct GNUNET_PeerIdentity my_full_id;
718 static struct GNUNET_CRYPTO_EccPrivateKey *my_private_key;
723 static struct GNUNET_CRYPTO_EccPublicKeyBinaryEncoded my_public_key;
726 * Tunnel ID for the next created tunnel (global tunnel number).
728 static MESH_TunnelNumber next_tid;
731 * Tunnel ID for the next incoming tunnel (local tunnel number).
733 static MESH_TunnelNumber next_local_tid;
736 * All ports clients of this peer have opened.
738 static struct GNUNET_CONTAINER_MultiHashMap32 *ports;
741 * Task to periodically announce itself in the network.
743 GNUNET_SCHEDULER_TaskIdentifier announce_id_task;
746 * Next ID to assign to a client.
748 unsigned int next_client_id;
751 /******************************************************************************/
752 /*********************** DECLARATIONS **************************/
753 /******************************************************************************/
756 * Function to process paths received for a new peer addition. The recorded
757 * paths form the initial tunnel, which can be optimized later.
758 * Called on each result obtained for the DHT search.
761 * @param exp when will this value expire
762 * @param key key of the result
763 * @param type type of the result
764 * @param size number of bytes in data
765 * @param data pointer to the result data
768 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
769 const struct GNUNET_HashCode * key,
770 const struct GNUNET_PeerIdentity *get_path,
771 unsigned int get_path_length,
772 const struct GNUNET_PeerIdentity *put_path,
773 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
774 size_t size, const void *data);
778 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
779 * and insert it in the appropriate structures if the peer is not known yet.
781 * @param peer Full identity of the peer.
783 * @return Existing or newly created peer info.
785 static struct MeshPeerInfo *
786 peer_get (const struct GNUNET_PeerIdentity *peer);
790 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
791 * and insert it in the appropriate structures if the peer is not known yet.
793 * @param peer Short identity of the peer.
795 * @return Existing or newly created peer info.
797 static struct MeshPeerInfo *
798 peer_get_short (const GNUNET_PEER_Id peer);
802 * Build a PeerPath from the paths returned from the DHT, reversing the paths
803 * to obtain a local peer -> destination path and interning the peer ids.
805 * @return Newly allocated and created path
807 static struct MeshPeerPath *
808 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
809 unsigned int get_path_length,
810 const struct GNUNET_PeerIdentity *put_path,
811 unsigned int put_path_length);
815 * Adds a path to the peer_infos of all the peers in the path
817 * @param p Path to process.
818 * @param confirmed Whether we know if the path works or not.
821 path_add_to_peers (struct MeshPeerPath *p, int confirmed);
826 * Search for a tunnel by global ID using full PeerIdentities.
828 * @param oid owner of the tunnel.
829 * @param tid global tunnel number.
831 * @return tunnel handler, NULL if doesn't exist.
833 static struct MeshTunnel *
834 tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid);
838 * Notify a tunnel that a connection has broken that affects at least
841 * @param t Tunnel affected.
842 * @param p1 Peer that got disconnected from p2.
843 * @param p2 Peer that got disconnected from p1.
845 * @return Short ID of the peer disconnected (either p1 or p2).
846 * 0 if the tunnel remained unaffected.
848 static GNUNET_PEER_Id
849 tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
854 * @brief Use the given path for the tunnel.
855 * Update the next and prev hops (and RCs).
856 * (Re)start the path refresh in case the tunnel is locally owned.
858 * @param t Tunnel to update.
859 * @param p Path to use.
862 tunnel_use_path (struct MeshTunnel *t, struct MeshPeerPath *p);
865 * Tunnel is empty: destroy it.
867 * Notifies all participants (peers, cleints) about the destruction.
869 * @param t Tunnel to destroy.
872 tunnel_destroy_empty (struct MeshTunnel *t);
875 * @brief Queue and pass message to core when possible.
877 * If type is payload (UNICAST, TO_ORIGIN, MULTICAST) checks for queue status
878 * and accounts for it. In case the queue is full, the message is dropped and
881 * Otherwise, message is treated as internal and allowed to go regardless of
884 * @param cls Closure (@c type dependant). It will be used by queue_send to
885 * build the message to be sent if not already prebuilt.
886 * @param type Type of the message, 0 for a raw message.
887 * @param size Size of the message.
888 * @param dst Neighbor to send message to.
889 * @param t Tunnel this message belongs to.
892 queue_add (void *cls, uint16_t type, size_t size,
893 struct MeshPeerInfo *dst, struct MeshTunnel *t);
897 * Free a transmission that was already queued with all resources
898 * associated to the request.
900 * @param queue Queue handler to cancel.
901 * @param clear_cls Is it necessary to free associated cls?
904 queue_destroy (struct MeshPeerQueue *queue, int clear_cls);
908 * @brief Get the next transmittable message from the queue.
910 * This will be the head, except in the case of being a data packet
911 * not allowed by the destination peer.
913 * @param peer Destination peer.
915 * @return The next viable MeshPeerQueue element to send to that peer.
916 * NULL when there are no transmittable messages.
918 struct MeshPeerQueue *
919 queue_get_next (const struct MeshPeerInfo *peer);
923 * Core callback to write a queued packet to core buffer
925 * @param cls Closure (peer info).
926 * @param size Number of bytes available in buf.
927 * @param buf Where the to write the message.
929 * @return number of bytes written to buf
932 queue_send (void *cls, size_t size, void *buf);
935 /******************************************************************************/
936 /************************ PERIODIC FUNCTIONS ****************************/
937 /******************************************************************************/
940 * Periodically announce self id in the DHT
943 * @param tc task context
946 announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
950 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
952 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
956 * - Set data expiration in function of X
959 DEBUG_DHT ("DHT_put for ID %s started.\n", GNUNET_i2s (&my_full_id));
961 block.id = my_full_id;
962 GNUNET_DHT_put (dht_handle, /* DHT handle */
963 &my_full_id.hashPubKey, /* Key to use */
964 dht_replication_level, /* Replication level */
965 GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, /* DHT options */
966 GNUNET_BLOCK_TYPE_MESH_PEER, /* Block type */
967 sizeof (block), /* Size of the data */
968 (const char *) &block, /* Data itself */
969 GNUNET_TIME_UNIT_FOREVER_ABS, /* Data expiration */
970 GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */
971 NULL, /* Continuation */
972 NULL); /* Continuation closure */
974 GNUNET_SCHEDULER_add_delayed (id_announce_time, &announce_id, cls);
978 /******************************************************************************/
979 /****************** GENERAL HELPER FUNCTIONS ************************/
980 /******************************************************************************/
984 * Check if client has registered with the service and has not disconnected
986 * @param client the client to check
988 * @return non-NULL if client exists in the global DLL
990 static struct MeshClient *
991 client_get (struct GNUNET_SERVER_Client *client)
993 return GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
998 * Deletes a tunnel from a client (either owner or destination). To be used on
1001 * @param c Client whose tunnel to delete.
1002 * @param t Tunnel which should be deleted.
1005 client_delete_tunnel (struct MeshClient *c, struct MeshTunnel *t)
1009 GNUNET_assert (GNUNET_YES ==
1010 GNUNET_CONTAINER_multihashmap32_remove (c->own_tunnels,
1016 GNUNET_assert (GNUNET_YES ==
1017 GNUNET_CONTAINER_multihashmap32_remove (c->incoming_tunnels,
1024 * Notify the appropriate client that a new incoming tunnel was created.
1026 * @param t Tunnel that was created.
1029 send_client_tunnel_create (struct MeshTunnel *t)
1031 struct GNUNET_MESH_TunnelMessage msg;
1033 if (NULL == t->client)
1035 msg.header.size = htons (sizeof (msg));
1036 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
1037 msg.tunnel_id = htonl (t->local_tid_dest);
1038 msg.port = htonl (t->port);
1040 msg.options |= GNUNET_YES == t->reliable ? GNUNET_MESH_OPTION_RELIABLE : 0;
1041 msg.options |= GNUNET_YES == t->nobuffer ? GNUNET_MESH_OPTION_NOBUFFER : 0;
1042 msg.options = htonl (msg.options);
1043 GNUNET_PEER_resolve (t->id.oid, &msg.peer);
1044 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
1045 &msg.header, GNUNET_NO);
1050 * Notify dest client that the incoming tunnel is no longer valid.
1052 * @param c Client to notify..
1053 * @param t Tunnel that is destroyed.
1056 send_client_tunnel_destroy (struct MeshClient *c, struct MeshTunnel *t)
1058 struct GNUNET_MESH_TunnelMessage msg;
1065 if (c != t->client && c != t->owner)
1070 msg.header.size = htons (sizeof (msg));
1071 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1072 msg.tunnel_id = htonl (t->local_tid_dest);
1073 msg.port = htonl (0);
1074 memset(&msg.peer, 0, sizeof (msg.peer));
1075 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
1076 &msg.header, GNUNET_NO);
1081 * Iterator over all the peers to remove the oldest not-used entry.
1083 * @param cls Closure (unsued).
1084 * @param key ID of the peer.
1085 * @param value Peer_Info of the peer.
1090 peer_info_timeout (void *cls,
1091 const struct GNUNET_HashCode *key,
1098 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
1099 * and insert it in the appropriate structures if the peer is not known yet.
1101 * @param peer Full identity of the peer.
1103 * @return Existing or newly created peer info.
1105 static struct MeshPeerInfo *
1106 peer_get (const struct GNUNET_PeerIdentity *peer)
1108 struct MeshPeerInfo *peer_info;
1110 peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
1111 if (NULL == peer_info)
1114 (struct MeshPeerInfo *) GNUNET_malloc (sizeof (struct MeshPeerInfo));
1115 if (GNUNET_CONTAINER_multihashmap_size (peers) > max_peers)
1117 GNUNET_CONTAINER_multihashmap_iterate (peers,
1121 GNUNET_CONTAINER_multihashmap_put (peers, &peer->hashPubKey, peer_info,
1122 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
1123 peer_info->id = GNUNET_PEER_intern (peer);
1125 peer_info->last_contact = GNUNET_TIME_absolute_get();
1132 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
1133 * and insert it in the appropriate structures if the peer is not known yet.
1135 * @param peer Short identity of the peer.
1137 * @return Existing or newly created peer info.
1139 static struct MeshPeerInfo *
1140 peer_get_short (const GNUNET_PEER_Id peer)
1142 struct GNUNET_PeerIdentity id;
1144 GNUNET_PEER_resolve (peer, &id);
1145 return peer_get (&id);
1150 * Choose the best path towards a peer considering the tunnel properties.
1152 * @param peer The destination peer.
1153 * @param t The tunnel the path is for.
1155 * @return Best current known path towards the peer, if any.
1157 static struct MeshPeerPath *
1158 peer_get_best_path (const struct MeshPeerInfo *peer, const struct MeshTunnel *t)
1160 struct MeshPeerPath *best_p;
1161 struct MeshPeerPath *p;
1162 unsigned int best_cost;
1165 best_p = p = peer->path_head;
1166 best_cost = cost = p->length;
1169 if ((cost = p->length) < best_cost)
1180 * Core callback to write a pre-constructed data packet to core buffer
1182 * @param cls Closure (MeshTransmissionDescriptor with data in "data" member).
1183 * @param size Number of bytes available in buf.
1184 * @param buf Where the to write the message.
1186 * @return number of bytes written to buf
1189 send_core_data_raw (void *cls, size_t size, void *buf)
1191 struct GNUNET_MessageHeader *msg = cls;
1194 GNUNET_assert (NULL != msg);
1195 total_size = ntohs (msg->size);
1197 if (total_size > size)
1202 memcpy (buf, msg, total_size);
1209 * Sends an already built message to a peer, properly registrating
1210 * all used resources.
1212 * @param message Message to send. Function makes a copy of it.
1213 * @param peer Short ID of the neighbor whom to send the message.
1214 * @param t Tunnel on which this message is transmitted.
1217 send_prebuilt_message (const struct GNUNET_MessageHeader *message,
1218 GNUNET_PEER_Id peer,
1219 struct MeshTunnel *t)
1221 struct GNUNET_PeerIdentity id;
1222 struct MeshPeerInfo *neighbor;
1223 struct MeshPeerPath *p;
1228 // GNUNET_TRANSPORT_try_connect(); FIXME use?
1233 size = ntohs (message->size);
1234 data = GNUNET_malloc (size);
1235 memcpy (data, message, size);
1236 type = ntohs(message->type);
1237 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type ||
1238 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type)
1240 struct GNUNET_MESH_Data *u;
1242 u = (struct GNUNET_MESH_Data *) data;
1243 u->ttl = htonl (ntohl (u->ttl) - 1);
1245 GNUNET_PEER_resolve (peer, &id);
1246 neighbor = peer_get (&id);
1247 for (p = neighbor->path_head; NULL != p; p = p->next)
1257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1258 " %s IS NOT DIRECTLY CONNECTED\n",
1260 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1263 for (p = neighbor->path_head; NULL != p; p = p->next)
1265 struct GNUNET_PeerIdentity debug_id;
1268 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1269 " path with %u hops through:\n",
1271 for (i = 0; i < p->length; i++)
1273 GNUNET_PEER_resolve(p->peers[i], &debug_id);
1274 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1276 i, GNUNET_i2s(&debug_id));
1280 GNUNET_break (0); // FIXME sometimes fails (testing disconnect?)
1281 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1282 " no direct connection to %s\n",
1287 if (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK == type)
1298 * Sends a CREATE PATH message for a path to a peer, properly registrating
1299 * all used resources.
1301 * @param t Tunnel for which the path is created.
1304 send_create_path (struct MeshTunnel *t)
1306 struct MeshPeerInfo *neighbor;
1308 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send create path\n");
1309 neighbor = peer_get_short (t->next_hop);
1311 GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE,
1312 sizeof (struct GNUNET_MESH_CreateTunnel) +
1313 (t->path->length * sizeof (struct GNUNET_PeerIdentity)),
1316 t->state = MESH_TUNNEL_WAITING;
1321 * Sends a PATH ACK message in reponse to a received PATH_CREATE directed to us.
1323 * @param t Tunnel which to confirm.
1326 send_path_ack (struct MeshTunnel *t)
1328 struct MeshPeerInfo *peer;
1330 peer = peer_get_short (t->prev_hop);
1333 GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
1334 sizeof (struct GNUNET_MESH_PathACK),
1341 * Try to establish a new connection to this peer in the given tunnel.
1342 * If the peer doesn't have any path to it yet, try to get one.
1343 * If the peer already has some path, send a CREATE PATH towards it.
1345 * @param peer PeerInfo of the peer.
1346 * @param t Tunnel for which to create the path, if possible.
1349 peer_connect (struct MeshPeerInfo *peer, struct MeshTunnel *t)
1351 struct MeshPeerPath *p;
1353 if (NULL != peer->path_head)
1355 p = peer_get_best_path (peer, t);
1356 tunnel_use_path (t, p);
1357 send_create_path (t);
1359 else if (NULL == peer->dhtget)
1361 struct GNUNET_PeerIdentity id;
1363 GNUNET_PEER_resolve (peer->id, &id);
1364 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1365 " Starting DHT GET for peer %s\n", GNUNET_i2s (&id));
1366 peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
1367 GNUNET_BLOCK_TYPE_MESH_PEER, /* type */
1368 &id.hashPubKey, /* key to search */
1369 dht_replication_level, /* replication level */
1370 GNUNET_DHT_RO_RECORD_ROUTE |
1371 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
1373 0, /* xquery bits */
1374 &dht_get_id_handler, peer);
1375 t->state = MESH_TUNNEL_SEARCHING;
1379 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1380 "There is no path but the DHT GET is already started.\n");
1386 * Destroy the peer_info and free any allocated resources linked to it
1388 * @param pi The peer_info to destroy.
1390 * @return GNUNET_OK on success
1393 peer_info_destroy (struct MeshPeerInfo *pi)
1395 struct GNUNET_PeerIdentity id;
1396 struct MeshPeerPath *p;
1397 struct MeshPeerPath *nextp;
1400 GNUNET_PEER_resolve (pi->id, &id);
1401 GNUNET_PEER_change_rc (pi->id, -1);
1404 GNUNET_CONTAINER_multihashmap_remove (peers, &id.hashPubKey, pi))
1407 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1408 "removing peer %s, not in hashmap\n", GNUNET_i2s (&id));
1410 if (NULL != pi->dhtget)
1412 GNUNET_DHT_get_stop (pi->dhtget);
1418 GNUNET_CONTAINER_DLL_remove (pi->path_head, pi->path_tail, p);
1422 for (i = 0; i < pi->ntunnels; i++)
1423 tunnel_destroy_empty (pi->tunnels[i]);
1424 GNUNET_array_grow (pi->tunnels, pi->ntunnels, 0);
1431 * Remove all paths that rely on a direct connection between p1 and p2
1432 * from the peer itself and notify all tunnels about it.
1434 * @param peer PeerInfo of affected peer.
1435 * @param p1 GNUNET_PEER_Id of one peer.
1436 * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and
1439 * TODO: optimize (see below)
1442 peer_remove_path (struct MeshPeerInfo *peer, GNUNET_PEER_Id p1,
1445 struct MeshPeerPath *p;
1446 struct MeshPeerPath *next;
1447 struct MeshPeerInfo *peer_d;
1449 unsigned int destroyed;
1452 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path\n");
1454 for (p = peer->path_head; NULL != p; p = next)
1457 for (i = 0; i < (p->length - 1); i++)
1459 if ((p->peers[i] == p1 && p->peers[i + 1] == p2) ||
1460 (p->peers[i] == p2 && p->peers[i + 1] == p1))
1462 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
1472 for (i = 0; i < peer->ntunnels; i++)
1474 d = tunnel_notify_connection_broken (peer->tunnels[i], p1, p2);
1478 peer_d = peer_get_short (d);
1479 next = peer_get_best_path (peer_d, peer->tunnels[i]);
1480 tunnel_use_path (peer->tunnels[i], next);
1481 peer_connect (peer_d, peer->tunnels[i]);
1483 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path END\n");
1488 * Add the path to the peer and update the path used to reach it in case this
1491 * @param peer_info Destination peer to add the path to.
1492 * @param path New path to add. Last peer must be the peer in arg 1.
1493 * Path will be either used of freed if already known.
1494 * @param trusted Do we trust that this path is real?
1497 peer_info_add_path (struct MeshPeerInfo *peer_info, struct MeshPeerPath *path,
1500 struct MeshPeerPath *aux;
1504 if ((NULL == peer_info) || (NULL == path))
1507 path_destroy (path);
1510 if (path->peers[path->length - 1] != peer_info->id)
1513 path_destroy (path);
1516 if (2 >= path->length && GNUNET_NO == trusted)
1518 /* Only allow CORE to tell us about direct paths */
1519 path_destroy (path);
1522 for (l = 1; l < path->length; l++)
1524 if (path->peers[l] == myid)
1526 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shortening path by %u\n", l);
1527 for (l2 = 0; l2 < path->length - l; l2++)
1529 path->peers[l2] = path->peers[l + l2];
1534 GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id));
1539 struct GNUNET_PeerIdentity id;
1541 GNUNET_PEER_resolve (peer_info->id, &id);
1542 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
1543 path->length, GNUNET_i2s (&id));
1546 l = path_get_length (path);
1549 path_destroy (path);
1553 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
1554 for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
1556 l2 = path_get_length (aux);
1559 GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
1560 peer_info->path_tail, aux, path);
1565 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
1567 path_destroy (path);
1572 GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail,
1579 * Add the path to the origin peer and update the path used to reach it in case
1580 * this is the shortest.
1581 * The path is given in peer_info -> destination, therefore we turn the path
1582 * upside down first.
1584 * @param peer_info Peer to add the path to, being the origin of the path.
1585 * @param path New path to add after being inversed.
1586 * Path will be either used or freed.
1587 * @param trusted Do we trust that this path is real?
1590 peer_info_add_path_to_origin (struct MeshPeerInfo *peer_info,
1591 struct MeshPeerPath *path, int trusted)
1594 peer_info_add_path (peer_info, path, trusted);
1599 * Add a tunnel to the list of tunnels a peer participates in.
1600 * Update the tunnel's destination.
1602 * @param p Peer to add to.
1603 * @param t Tunnel to add.
1606 peer_info_add_tunnel (struct MeshPeerInfo *p, struct MeshTunnel *t)
1610 GNUNET_break (t->dest == p->id);
1614 GNUNET_PEER_change_rc (t->dest, 1);
1615 GNUNET_array_append (p->tunnels, p->ntunnels, t);
1620 * Remove a tunnel from the list of tunnels a peer participates in.
1621 * Free the tunnel's destination.
1623 * @param p Peer to clean.
1624 * @param t Tunnel to remove.
1627 peer_info_remove_tunnel (struct MeshPeerInfo *p, struct MeshTunnel *t)
1631 if (t->dest == p->id)
1633 GNUNET_PEER_change_rc (t->dest, -1);
1636 for (i = 0; i < p->ntunnels; i++)
1638 if (p->tunnels[i] == t)
1640 p->tunnels[i] = p->tunnels[p->ntunnels - 1];
1641 GNUNET_array_grow (p->tunnels, p->ntunnels, p->ntunnels - 1);
1649 * Function called if the connection to the peer has been stalled for a while,
1650 * possibly due to a missed ACK. Poll the peer about its ACK status.
1652 * @param cls Closure (poll ctx).
1653 * @param tc TaskContext.
1656 tunnel_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1658 struct MeshFlowControl *fc = cls;
1659 struct GNUNET_MESH_Poll msg;
1660 struct MeshTunnel *t = fc->t;
1661 GNUNET_PEER_Id peer;
1663 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
1664 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1669 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** Polling!\n");
1671 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL);
1672 msg.header.size = htons (sizeof (msg));
1673 msg.tid = htonl (t->id.tid);
1674 msg.pid = htonl (fc->last_pid_sent);
1675 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
1677 if (fc == &t->prev_fc)
1679 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** prev peer!\n");
1682 else if (fc == &t->next_fc)
1684 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** next peer!\n");
1692 send_prebuilt_message (&msg.header, peer, t);
1693 fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
1694 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
1700 * Build a PeerPath from the paths returned from the DHT, reversing the paths
1701 * to obtain a local peer -> destination path and interning the peer ids.
1703 * @return Newly allocated and created path
1705 static struct MeshPeerPath *
1706 path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
1707 unsigned int get_path_length,
1708 const struct GNUNET_PeerIdentity *put_path,
1709 unsigned int put_path_length)
1711 struct MeshPeerPath *p;
1717 GNUNET_PEER_change_rc (myid, 1);
1718 i = get_path_length;
1719 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " GET has %d hops.\n", i);
1720 for (i--; i >= 0; i--)
1722 id = GNUNET_PEER_intern (&get_path[i]);
1723 if (p->length > 0 && id == p->peers[p->length - 1])
1725 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
1726 GNUNET_PEER_change_rc (id, -1);
1730 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from GET: %s.\n",
1731 GNUNET_i2s (&get_path[i]));
1733 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
1734 p->peers[p->length - 1] = id;
1737 i = put_path_length;
1738 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PUT has %d hops.\n", i);
1739 for (i--; i >= 0; i--)
1741 id = GNUNET_PEER_intern (&put_path[i]);
1744 /* PUT path went through us, so discard the path up until now and start
1745 * from here to get a much shorter (and loop-free) path.
1750 if (p->length > 0 && id == p->peers[p->length - 1])
1752 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
1753 GNUNET_PEER_change_rc (id, -1);
1757 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from PUT: %s.\n",
1758 GNUNET_i2s (&put_path[i]));
1760 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
1761 p->peers[p->length - 1] = id;
1765 if (get_path_length > 0)
1766 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of GET: %s)\n",
1767 GNUNET_i2s (&get_path[0]));
1768 if (put_path_length > 0)
1769 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of PUT: %s)\n",
1770 GNUNET_i2s (&put_path[0]));
1771 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " In total: %d hops\n",
1773 for (i = 0; i < p->length; i++)
1775 struct GNUNET_PeerIdentity peer_id;
1777 GNUNET_PEER_resolve (p->peers[i], &peer_id);
1778 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u: %s\n", p->peers[i],
1779 GNUNET_i2s (&peer_id));
1787 * Adds a path to the peer_infos of all the peers in the path
1789 * @param p Path to process.
1790 * @param confirmed Whether we know if the path works or not.
1793 path_add_to_peers (struct MeshPeerPath *p, int confirmed)
1797 /* TODO: invert and add */
1798 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
1799 for (i++; i < p->length; i++)
1801 struct MeshPeerInfo *aux;
1802 struct MeshPeerPath *copy;
1804 aux = peer_get_short (p->peers[i]);
1805 copy = path_duplicate (p);
1806 copy->length = i + 1;
1807 peer_info_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
1813 * Send keepalive packets for a peer
1815 * @param cls Closure (tunnel for which to send the keepalive).
1816 * @param tc Notification context.
1819 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
1823 * Search for a tunnel among the incoming tunnels
1825 * @param tid the local id of the tunnel
1827 * @return tunnel handler, NULL if doesn't exist
1829 static struct MeshTunnel *
1830 tunnel_get_incoming (MESH_TunnelNumber tid)
1832 GNUNET_assert (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV);
1833 return GNUNET_CONTAINER_multihashmap32_get (incoming_tunnels, tid);
1838 * Search for a tunnel among the tunnels for a client
1840 * @param c the client whose tunnels to search in
1841 * @param tid the local id of the tunnel
1843 * @return tunnel handler, NULL if doesn't exist
1845 static struct MeshTunnel *
1846 tunnel_get_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid)
1848 if (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1850 return tunnel_get_incoming (tid);
1854 GNUNET_assert (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI);
1855 return GNUNET_CONTAINER_multihashmap32_get (c->own_tunnels, tid);
1861 * Search for a tunnel by global ID using PEER_ID
1863 * @param pi owner of the tunnel
1864 * @param tid global tunnel number
1866 * @return tunnel handler, NULL if doesn't exist
1868 static struct MeshTunnel *
1869 tunnel_get_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid)
1871 struct MESH_TunnelID id;
1872 struct GNUNET_HashCode hash;
1877 GNUNET_CRYPTO_hash (&id, sizeof (struct MESH_TunnelID), &hash);
1878 return GNUNET_CONTAINER_multihashmap_get (tunnels, &hash);
1883 * Search for a tunnel by global ID using full PeerIdentities
1885 * @param oid owner of the tunnel
1886 * @param tid global tunnel number
1888 * @return tunnel handler, NULL if doesn't exist
1890 static struct MeshTunnel *
1891 tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid)
1893 return tunnel_get_by_pi (GNUNET_PEER_search (oid), tid);
1898 * Add a client to a tunnel, initializing all needed data structures.
1900 * @param t Tunnel to which add the client.
1901 * @param c Client which to add to the tunnel.
1904 tunnel_add_client (struct MeshTunnel *t, struct MeshClient *c)
1906 if (NULL != t->client)
1912 GNUNET_CONTAINER_multihashmap32_put (c->incoming_tunnels,
1913 t->local_tid_dest, t,
1914 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
1920 GNUNET_CONTAINER_multihashmap32_put (incoming_tunnels,
1921 t->local_tid_dest, t,
1922 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
1932 tunnel_use_path (struct MeshTunnel *t, struct MeshPeerPath *p)
1934 unsigned int own_pos;
1936 for (own_pos = 0; own_pos < p->length; own_pos++)
1938 if (p->peers[own_pos] == myid)
1941 if (own_pos > p->length - 1)
1947 if (own_pos < p->length - 1)
1948 t->next_hop = p->peers[own_pos + 1];
1950 t->next_hop = p->peers[own_pos];
1951 GNUNET_PEER_change_rc (t->next_hop, 1);
1953 t->prev_hop = p->peers[own_pos - 1];
1955 t->prev_hop = p->peers[0];
1956 GNUNET_PEER_change_rc (t->prev_hop, 1);
1958 if (NULL != t->path)
1959 path_destroy (t->path);
1960 t->path = path_duplicate (p);
1963 if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
1964 GNUNET_SCHEDULER_cancel (t->maintenance_task);
1965 t->maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_path_time,
1972 * Notifies a tunnel that a connection has broken that affects at least
1973 * some of its peers. Sends a notification towards the root of the tree.
1974 * In case the peer is the owner of the tree, notifies the client that owns
1975 * the tunnel and tries to reconnect.
1977 * @param t Tunnel affected.
1978 * @param p1 Peer that got disconnected from p2.
1979 * @param p2 Peer that got disconnected from p1.
1981 * @return Short ID of the peer disconnected (either p1 or p2).
1982 * 0 if the tunnel remained unaffected.
1984 static GNUNET_PEER_Id
1985 tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
1988 // if (myid != p1 && myid != p2) FIXME
1993 // if (tree_get_predecessor (t->tree) != 0)
1995 // /* We are the peer still connected, notify owner of the disconnection. */
1996 // struct GNUNET_MESH_PathBroken msg;
1997 // struct GNUNET_PeerIdentity neighbor;
1999 // msg.header.size = htons (sizeof (msg));
2000 // msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN);
2001 // GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2002 // msg.tid = htonl (t->id.tid);
2003 // msg.peer1 = my_full_id;
2004 // GNUNET_PEER_resolve (pid, &msg.peer2);
2005 // GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor);
2006 // send_prebuilt_message (&msg.header, &neighbor, t);
2013 * Build a local ACK message and send it to a local client.
2015 * @param t Tunnel on which to send the ACK.
2016 * @param c Client to whom send the ACK.
2017 * @param is_fwd Set to GNUNET_YES for FWD ACK (dest->owner)
2020 send_local_ack (struct MeshTunnel *t,
2021 struct MeshClient *c,
2024 struct GNUNET_MESH_LocalAck msg;
2026 msg.header.size = htons (sizeof (msg));
2027 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
2028 msg.tunnel_id = htonl (is_fwd ? t->local_tid : t->local_tid_dest);
2029 GNUNET_SERVER_notification_context_unicast (nc,
2036 * Build an ACK message and queue it to send to the given peer.
2038 * @param t Tunnel on which to send the ACK.
2039 * @param peer Peer to whom send the ACK.
2040 * @param ack Value of the ACK.
2043 send_ack (struct MeshTunnel *t, GNUNET_PEER_Id peer, uint32_t ack)
2045 struct GNUNET_MESH_ACK msg;
2047 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2048 msg.header.size = htons (sizeof (msg));
2049 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK);
2050 msg.pid = htonl (ack);
2051 msg.tid = htonl (t->id.tid);
2053 send_prebuilt_message (&msg.header, peer, t);
2058 * Send an end-to-end FWD ACK message for the most recent in-sequence payload.
2060 * @param t Tunnel this is about.
2063 tunnel_send_fwd_data_ack (struct MeshTunnel *t)
2065 struct GNUNET_MESH_DataACK msg;
2067 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK);
2068 msg.header.size = htons (sizeof (msg));
2069 msg.tid = htonl (t->id.tid);
2070 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2071 msg.mid = GNUNET_htonll (t->bck_rel->mid_recv - 1);
2072 msg.futures = 0; // FIXME set bits of other newer messages received
2074 send_prebuilt_message (&msg.header, t->prev_hop, t);
2079 * Send an end-to-end BCK ACK message for the most recent in-sequence payload.
2081 * @param t Tunnel this is about.
2084 tunnel_send_bck_data_ack (struct MeshTunnel *t)
2086 struct GNUNET_MESH_DataACK msg;
2088 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK);
2089 msg.header.size = htons (sizeof (msg));
2090 msg.tid = htonl (t->id.tid);
2091 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2092 msg.mid = GNUNET_htonll (t->fwd_rel->mid_recv - 1);
2093 msg.futures = 0; // FIXME set bits of other newer messages received
2095 send_prebuilt_message (&msg.header, t->next_hop, t);
2100 * Send an ACK informing the predecessor about the available buffer space.
2101 * In case there is no predecessor, inform the owning client.
2102 * If buffering is off, send only on behalf of children or self if endpoint.
2103 * If buffering is on, send when sent to children and buffer space is free.
2104 * Note that although the name is fwd_ack, the FWD mean forward *traffic*,
2105 * the ACK itself goes "back" (towards root).
2107 * @param t Tunnel on which to send the ACK.
2108 * @param type Type of message that triggered the ACK transmission.
2111 tunnel_send_fwd_ack (struct MeshTunnel *t, uint16_t type)
2116 /* Is it after unicast retransmission? */
2119 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
2120 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2121 "ACK due to FWD DATA retransmission\n");
2122 if (GNUNET_YES == t->nobuffer)
2124 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, nobuffer\n");
2127 if (GNUNET_YES == t->reliable && NULL != t->client)
2128 tunnel_send_fwd_data_ack (t);
2130 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2131 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
2133 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2134 case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
2135 t->force_ack = GNUNET_YES;
2141 /* Check if we need to transmit the ACK */
2142 if (0 && NULL == t->owner &&
2143 t->queue_max > t->next_fc.queue_n * 4 &&
2144 GMC_is_pid_bigger(t->prev_fc.last_ack_sent, t->prev_fc.last_pid_recv) &&
2145 GNUNET_NO == t->force_ack)
2147 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, buffer free\n");
2148 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2149 " t->qmax: %u, t->qn: %u\n",
2150 t->queue_max, t->next_fc.queue_n);
2151 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2152 " t->pid: %u, t->ack: %u\n",
2153 t->prev_fc.last_pid_recv, t->prev_fc.last_ack_sent);
2157 /* Ok, ACK might be necessary, what PID to ACK? */
2158 delta = t->queue_max - t->next_fc.queue_n;
2159 if (0 > delta || (GNUNET_YES == t->reliable &&
2161 t->fwd_rel->n_sent > 10))
2163 if (NULL != t->owner && delta > 1)
2165 ack = t->prev_fc.last_pid_recv + delta;
2166 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK %u\n", ack);
2167 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2168 " last %u, qmax %u, q %u\n",
2169 t->prev_fc.last_pid_recv, t->queue_max, t->next_fc.queue_n);
2170 if (ack == t->prev_fc.last_ack_sent && GNUNET_NO == t->force_ack)
2172 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
2176 t->prev_fc.last_ack_sent = ack;
2177 if (NULL != t->owner)
2178 send_local_ack (t, t->owner, GNUNET_YES);
2179 else if (0 != t->prev_hop)
2180 send_ack (t, t->prev_hop, ack);
2184 t->force_ack = GNUNET_NO;
2189 * Send an ACK informing the children node/client about the available
2191 * If buffering is off, send only on behalf of root (can be self).
2192 * If buffering is on, send when sent to predecessor and buffer space is free.
2193 * Note that although the name is bck_ack, the BCK mean backwards *traffic*,
2194 * the ACK itself goes "forward" (towards children/clients).
2196 * @param t Tunnel on which to send the ACK.
2197 * @param type Type of message that triggered the ACK transmission.
2200 tunnel_send_bck_ack (struct MeshTunnel *t, uint16_t type)
2203 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2204 "Sending BCK ACK on tunnel %u [%u] due to %s\n",
2205 t->id.oid, t->id.tid, GNUNET_MESH_DEBUG_M2S(type));
2206 /* Is it after data to_origin retransmission? */
2209 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
2210 if (GNUNET_YES == t->nobuffer)
2212 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2213 " Not sending ACK, nobuffer + traffic\n");
2216 if (GNUNET_YES == t->reliable && NULL != t->owner)
2217 tunnel_send_bck_data_ack (t);
2219 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2220 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
2222 case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
2223 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2224 t->force_ack = GNUNET_YES;
2230 /* TODO: Check if we need to transmit the ACK (as in fwd) */
2232 ack = t->next_fc.last_pid_recv + t->queue_max - t->prev_fc.queue_n;
2234 if (t->next_fc.last_ack_sent == ack && GNUNET_NO == t->force_ack)
2236 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2237 " Not sending ACK, not needed, last ack sent was %u\n",
2238 t->next_fc.last_ack_sent);
2241 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2242 " Sending BCK ACK %u (last sent: %u)\n",
2243 ack, t->next_fc.last_ack_sent);
2244 t->next_fc.last_ack_sent = ack;
2246 if (NULL != t->client)
2247 send_local_ack (t, t->client, GNUNET_NO);
2248 else if (0 != t->next_hop)
2249 send_ack (t, t->next_hop, ack);
2252 t->force_ack = GNUNET_NO;
2257 * Modify the mesh message TID from global to local and send to client.
2259 * @param t Tunnel on which to send the message.
2260 * @param msg Message to modify and send.
2261 * @param c Client to send to.
2262 * @param tid Tunnel ID to use (c can be both owner and client).
2265 tunnel_send_client_data (struct MeshTunnel *t,
2266 const struct GNUNET_MESH_Data *msg,
2267 struct MeshClient *c, MESH_TunnelNumber tid)
2269 struct GNUNET_MESH_LocalData *copy;
2270 uint16_t size = ntohs (msg->header.size) - sizeof (struct GNUNET_MESH_Data);
2271 char cbuf[size + sizeof (struct GNUNET_MESH_LocalData)];
2273 if (size < sizeof (struct GNUNET_MessageHeader))
2275 GNUNET_break_op (0);
2283 copy = (struct GNUNET_MESH_LocalData *) cbuf;
2284 memcpy (©[1], &msg[1], size);
2285 copy->header.size = htons (sizeof (struct GNUNET_MESH_LocalData) + size);
2286 copy->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA);
2287 copy->tid = htonl (tid);
2288 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
2289 ©->header, GNUNET_NO);
2293 * Modify the unicast 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_ucast (struct MeshTunnel *t,
2300 const struct GNUNET_MESH_Data *msg)
2302 tunnel_send_client_data (t, msg, t->client, t->local_tid_dest);
2307 * Modify the to_origin message TID from global to local and send to client.
2309 * @param t Tunnel on which to send the message.
2310 * @param msg Message to modify and send.
2313 tunnel_send_client_to_orig (struct MeshTunnel *t,
2314 const struct GNUNET_MESH_Data *msg)
2316 tunnel_send_client_data (t, msg, t->owner, t->local_tid);
2321 * We haven't received an ACK after a certain time: restransmit the message.
2323 * @param cls Closure (MeshReliableMessage with the message to restransmit)
2324 * @param tc TaskContext.
2327 tunnel_retransmit_message (void *cls,
2328 const struct GNUNET_SCHEDULER_TaskContext *tc)
2330 struct MeshTunnelReliability *rel = cls;
2331 struct MeshReliableMessage *copy;
2332 struct MeshFlowControl *fc;
2333 struct MeshPeerQueue *q;
2334 struct MeshPeerInfo *pi;
2335 struct MeshTunnel *t;
2336 struct GNUNET_MESH_Data *payload;
2339 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
2340 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2344 copy = rel->head_sent;
2351 /* Search the message to be retransmitted in the outgoing queue */
2352 payload = (struct GNUNET_MESH_Data *) ©[1];
2353 hop = rel == t->fwd_rel ? t->next_hop : t->prev_hop;
2354 fc = rel == t->fwd_rel ? &t->prev_fc : &t->next_fc;
2355 pi = peer_get_short (hop);
2356 for (q = pi->queue_head; NULL != q; q = q->next)
2358 if (ntohs (payload->header.type) == q->type)
2360 struct GNUNET_MESH_Data *queued_data = q->cls;
2362 if (queued_data->mid == payload->mid)
2367 /* Message not found in the queue */
2370 struct GNUNET_TIME_Relative diff;
2372 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RETRANSMIT %llu\n", copy->mid);
2373 diff = GNUNET_TIME_absolute_get_duration (copy->timestamp);
2374 diff = GNUNET_TIME_relative_divide (diff, 10);
2375 copy->timestamp = GNUNET_TIME_absolute_subtract (GNUNET_TIME_absolute_get(),
2378 fc->last_ack_sent++;
2379 payload->pid = htonl (fc->last_pid_recv + 1);
2380 fc->last_pid_recv++;
2381 send_prebuilt_message (&payload->header, hop, t);
2382 GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO);
2386 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! STILL IN QUEUE %llu\n", copy->mid);
2389 rel->retry_timer = GNUNET_TIME_STD_BACKOFF (rel->retry_timer);
2390 rel->retry_task = GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
2391 &tunnel_retransmit_message,
2397 * @brief Re-initiate traffic to this peer if necessary.
2399 * Check if there is traffic queued towards this peer
2400 * and the core transmit handle is NULL (traffic was stalled).
2401 * If so, call core tmt rdy.
2403 * @param peer_id Short ID of peer to which initiate traffic.
2406 peer_unlock_queue(GNUNET_PEER_Id peer_id)
2408 struct MeshPeerInfo *peer;
2409 struct GNUNET_PeerIdentity id;
2410 struct MeshPeerQueue *q;
2413 peer = peer_get_short (peer_id);
2414 if (NULL != peer->core_transmit)
2417 q = queue_get_next (peer);
2420 /* Might br multicast traffic already sent to this particular peer but
2421 * not to other children in this tunnel.
2422 * This way t->queue_n would be > 0 but the queue of this particular peer
2428 GNUNET_PEER_resolve (peer->id, &id);
2429 peer->core_transmit =
2430 GNUNET_CORE_notify_transmit_ready(core_handle,
2433 GNUNET_TIME_UNIT_FOREVER_REL,
2443 * Send a message to all peers and clients in this tunnel that the tunnel
2444 * is no longer valid. If some peer or client should not receive the message,
2445 * should be zero'ed out before calling this function.
2447 * @param t The tunnel whose peers and clients to notify.
2450 tunnel_send_destroy (struct MeshTunnel *t)
2452 struct GNUNET_MESH_TunnelDestroy msg;
2453 struct GNUNET_PeerIdentity id;
2455 msg.header.size = htons (sizeof (msg));
2456 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);
2457 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2458 msg.tid = htonl (t->id.tid);
2459 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2460 " sending tunnel destroy for tunnel: %s [%X]\n",
2461 GNUNET_i2s (&msg.oid), t->id.tid);
2463 if (NULL == t->client && 0 != t->next_hop)
2465 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " child: %u\n", t->next_hop);
2466 GNUNET_PEER_resolve (t->next_hop, &id);
2467 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2468 " sending forward to %s\n",
2470 send_prebuilt_message (&msg.header, t->next_hop, t);
2472 if (NULL == t->owner && 0 != t->prev_hop)
2474 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " parent: %u\n", t->prev_hop);
2475 GNUNET_PEER_resolve (t->prev_hop, &id);
2476 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2477 " sending back to %s\n",
2479 send_prebuilt_message (&msg.header, t->prev_hop, t);
2481 if (NULL != t->owner)
2483 send_client_tunnel_destroy (t->owner, t);
2485 if (NULL != t->client)
2487 send_client_tunnel_destroy (t->client, t);
2493 * Cancel all transmissions towards a neighbor that belongs to a certain tunnel.
2495 * @param t Tunnel which to cancel.
2496 * @param neighbor Short ID of the neighbor to whom cancel the transmissions.
2499 peer_cancel_queues (GNUNET_PEER_Id neighbor, struct MeshTunnel *t)
2501 struct MeshPeerInfo *peer_info;
2502 struct MeshPeerQueue *pq;
2503 struct MeshPeerQueue *next;
2506 return; /* Was local peer, 0'ed in tunnel_destroy_iterator */
2507 peer_info = peer_get_short (neighbor);
2508 for (pq = peer_info->queue_head; NULL != pq; pq = next)
2511 if (pq->tunnel == t)
2513 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == pq->type ||
2514 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == pq->type)
2516 /* Should have been removed on destroy children */
2519 queue_destroy (pq, GNUNET_YES);
2522 if (NULL == peer_info->queue_head && NULL != peer_info->core_transmit)
2524 GNUNET_CORE_notify_transmit_ready_cancel(peer_info->core_transmit);
2525 peer_info->core_transmit = NULL;
2531 * Destroy the tunnel.
2533 * This function does not generate any warning traffic to clients or peers.
2536 * Remove the tunnel from peer_info's and clients' hashmaps.
2537 * Cancel messages belonging to this tunnel queued to neighbors.
2538 * Free any allocated resources linked to the tunnel.
2540 * @param t the tunnel to destroy
2542 * @return GNUNET_OK on success
2545 tunnel_destroy (struct MeshTunnel *t)
2547 struct MeshClient *c;
2548 struct GNUNET_HashCode hash;
2558 struct GNUNET_PeerIdentity id;
2560 GNUNET_PEER_resolve (t->id.oid, &id);
2561 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s [%x]\n",
2562 GNUNET_i2s (&id), t->id.tid);
2564 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
2568 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2569 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t))
2578 GNUNET_CONTAINER_multihashmap32_remove (c->own_tunnels, t->local_tid, t))
2585 if (NULL != t->client)
2589 GNUNET_CONTAINER_multihashmap32_remove (c->incoming_tunnels,
2590 t->local_tid_dest, t))
2596 GNUNET_CONTAINER_multihashmap32_remove (incoming_tunnels,
2597 t->local_tid_dest, t))
2604 if (0 != t->prev_hop)
2606 peer_cancel_queues (t->prev_hop, t);
2607 GNUNET_PEER_change_rc (t->prev_hop, -1);
2609 if (0 != t->next_hop)
2611 peer_cancel_queues (t->next_hop, t);
2612 GNUNET_PEER_change_rc (t->next_hop, -1);
2615 peer_info_remove_tunnel (peer_get_short (t->dest), t);
2618 if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
2619 GNUNET_SCHEDULER_cancel (t->maintenance_task);
2622 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
2623 path_destroy (t->path);
2629 * Tunnel is empty: destroy it.
2631 * Notifies all participants (peers, cleints) about the destruction.
2633 * @param t Tunnel to destroy.
2636 tunnel_destroy_empty (struct MeshTunnel *t)
2640 struct GNUNET_PeerIdentity id;
2642 GNUNET_PEER_resolve (t->id.oid, &id);
2643 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2644 "executing destruction of empty tunnel %s [%X]\n",
2645 GNUNET_i2s (&id), t->id.tid);
2649 if (GNUNET_NO == t->destroy)
2650 tunnel_send_destroy (t);
2651 if (0 == t->pending_messages)
2654 t->destroy = GNUNET_YES;
2658 * Initialize a Flow Control structure to the initial state.
2660 * @param fc Flow Control structure to initialize.
2663 fc_init (struct MeshFlowControl *fc)
2665 fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
2666 fc->last_pid_recv = (uint32_t) -1;
2667 fc->last_ack_sent = (uint32_t) -1; /* No traffic allowed yet */
2668 fc->last_ack_recv = (uint32_t) -1;
2669 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2670 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
2675 * Create a new tunnel
2677 * @param owner Who is the owner of the tunnel (short ID).
2678 * @param tid Tunnel Number of the tunnel.
2679 * @param client Clients that owns the tunnel, NULL for foreign tunnels.
2680 * @param local Tunnel Number for the tunnel, for the client point of view.
2682 * @return A new initialized tunnel. NULL on error.
2684 static struct MeshTunnel *
2685 tunnel_new (GNUNET_PEER_Id owner,
2686 MESH_TunnelNumber tid,
2687 struct MeshClient *client,
2688 MESH_TunnelNumber local)
2690 struct MeshTunnel *t;
2691 struct GNUNET_HashCode hash;
2693 if (n_tunnels >= max_tunnels && NULL == client)
2696 t = GNUNET_malloc (sizeof (struct MeshTunnel));
2699 t->queue_max = (max_msgs_queue / max_tunnels) + 1;
2701 fc_init (&t->next_fc);
2702 fc_init (&t->prev_fc);
2703 t->local_tid = local;
2705 GNUNET_STATISTICS_update (stats, "# tunnels", 1, GNUNET_NO);
2707 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2709 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
2710 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2717 GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR);
2725 GNUNET_CONTAINER_multihashmap32_put (client->own_tunnels,
2727 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2731 GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR);
2741 * Set options in a tunnel, extracted from a bit flag field
2743 * @param t Tunnel to set options to.
2744 * @param options Bit array in host byte order.
2747 tunnel_set_options (struct MeshTunnel *t, uint32_t options)
2749 t->nobuffer = (options & GNUNET_MESH_OPTION_NOBUFFER) != 0 ?
2750 GNUNET_YES : GNUNET_NO;
2751 t->reliable = (options & GNUNET_MESH_OPTION_RELIABLE) != 0 ?
2752 GNUNET_YES : GNUNET_NO;
2757 * Iterator for deleting each tunnel whose client endpoint disconnected.
2759 * @param cls Closure (client that has disconnected).
2760 * @param key The local tunnel id (used to access the hashmap).
2761 * @param value The value stored at the key (tunnel to destroy).
2763 * @return GNUNET_OK, keep iterating.
2766 tunnel_destroy_iterator (void *cls,
2770 struct MeshTunnel *t = value;
2771 struct MeshClient *c = cls;
2773 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2774 " Tunnel %X / %X destroy, due to client %u shutdown.\n",
2775 t->local_tid, t->local_tid_dest, c->id);
2776 client_delete_tunnel (c, t);
2779 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is destination.\n", c->id);
2781 if (0 != t->next_hop) { /* destroy could come before a path is used */
2782 GNUNET_PEER_change_rc (t->next_hop, -1);
2788 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is owner.\n", c->id);
2790 if (0 != t->prev_hop) { /* destroy could come before a path is used */
2791 GNUNET_PEER_change_rc (t->prev_hop, -1);
2796 tunnel_destroy_empty (t);
2803 * Timeout function, destroys tunnel if called
2805 * @param cls Closure (tunnel to destroy).
2806 * @param tc TaskContext
2809 tunnel_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2811 struct MeshTunnel *t = cls;
2812 struct GNUNET_PeerIdentity id;
2814 t->maintenance_task = GNUNET_SCHEDULER_NO_TASK;
2815 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2817 GNUNET_PEER_resolve(t->id.oid, &id);
2818 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2819 "Tunnel %s [%X] timed out. Destroying.\n",
2820 GNUNET_i2s(&id), t->id.tid);
2821 if (NULL != t->client)
2822 send_client_tunnel_destroy (t->client, t);
2823 tunnel_destroy (t); /* Do not notify other */
2828 * Resets the tunnel timeout. Starts it if no timeout was running.
2830 * @param t Tunnel whose timeout to reset.
2832 * TODO use heap to improve efficiency of scheduler.
2835 tunnel_reset_timeout (struct MeshTunnel *t)
2837 if (NULL != t->owner || 0 != t->local_tid || 0 == t->prev_hop)
2839 if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
2840 GNUNET_SCHEDULER_cancel (t->maintenance_task);
2841 t->maintenance_task =
2842 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
2843 (refresh_path_time, 4), &tunnel_timeout, t);
2847 /******************************************************************************/
2848 /**************** MESH NETWORK HANDLER HELPERS ***********************/
2849 /******************************************************************************/
2852 * Function to send a create path packet to a peer.
2854 * @param cls closure
2855 * @param size number of bytes available in buf
2856 * @param buf where the callee should write the message
2857 * @return number of bytes written to buf
2860 send_core_path_create (void *cls, size_t size, void *buf)
2862 struct MeshTunnel *t = cls;
2863 struct GNUNET_MESH_CreateTunnel *msg;
2864 struct GNUNET_PeerIdentity *peer_ptr;
2865 struct MeshPeerPath *p = t->path;
2870 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATE PATH sending...\n");
2872 sizeof (struct GNUNET_MESH_CreateTunnel) +
2873 p->length * sizeof (struct GNUNET_PeerIdentity);
2875 if (size < size_needed || NULL == buf)
2880 msg = (struct GNUNET_MESH_CreateTunnel *) buf;
2881 msg->header.size = htons (size_needed);
2882 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE);
2883 msg->tid = ntohl (t->id.tid);
2886 if (GNUNET_YES == t->nobuffer)
2887 opt |= GNUNET_MESH_OPTION_NOBUFFER;
2888 if (GNUNET_YES == t->reliable)
2889 opt |= GNUNET_MESH_OPTION_RELIABLE;
2890 msg->opt = htonl (opt);
2891 msg->port = htonl (t->port);
2893 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
2894 for (i = 0; i < p->length; i++)
2896 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
2899 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2900 "CREATE PATH (%u bytes long) sent!\n", size_needed);
2906 * Creates a path ack message in buf and frees all unused resources.
2908 * @param cls closure (MeshTransmissionDescriptor)
2909 * @param size number of bytes available in buf
2910 * @param buf where the callee should write the message
2911 * @return number of bytes written to buf
2914 send_core_path_ack (void *cls, size_t size, void *buf)
2916 struct MeshTunnel *t = cls;
2917 struct GNUNET_MESH_PathACK *msg = buf;
2919 GNUNET_assert (NULL != t);
2920 if (sizeof (struct GNUNET_MESH_PathACK) > size)
2925 t->prev_fc.last_ack_sent = t->nobuffer ? 0 : t->queue_max - 1;
2926 msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK));
2927 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
2928 GNUNET_PEER_resolve (t->id.oid, &msg->oid);
2929 msg->tid = htonl (t->id.tid);
2930 msg->peer_id = my_full_id;
2931 msg->ack = htonl (t->prev_fc.last_ack_sent);
2933 /* TODO add signature */
2935 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "PATH ACK sent!\n");
2936 return sizeof (struct GNUNET_MESH_PathACK);
2941 * Free a transmission that was already queued with all resources
2942 * associated to the request.
2944 * @param queue Queue handler to cancel.
2945 * @param clear_cls Is it necessary to free associated cls?
2948 queue_destroy (struct MeshPeerQueue *queue, int clear_cls)
2950 struct MeshFlowControl *fc;
2952 if (GNUNET_YES == clear_cls)
2954 switch (queue->type)
2956 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
2957 GNUNET_log (GNUNET_ERROR_TYPE_INFO, " cancelling TUNNEL_DESTROY\n");
2958 GNUNET_break (GNUNET_YES == queue->tunnel->destroy);
2960 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
2961 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
2962 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2963 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2964 case GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE:
2965 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2966 " prebuilt message\n");
2967 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2969 GNUNET_MESH_DEBUG_M2S (queue->type));
2971 case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
2972 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type create path\n");
2976 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2977 " type %s unknown!\n",
2978 GNUNET_MESH_DEBUG_M2S (queue->type));
2980 GNUNET_free_non_null (queue->cls);
2982 GNUNET_CONTAINER_DLL_remove (queue->peer->queue_head,
2983 queue->peer->queue_tail,
2986 /* Delete from appropriate fc in the tunnel */
2987 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == queue->type ||
2988 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == queue->type )
2990 if (queue->peer->id == queue->tunnel->prev_hop)
2991 fc = &queue->tunnel->prev_fc;
2992 else if (queue->peer->id == queue->tunnel->next_hop)
2993 fc = &queue->tunnel->next_fc;
2997 GNUNET_free (queue);
3002 GNUNET_free (queue);
3007 * @brief Get the next transmittable message from the queue.
3009 * This will be the head, except in the case of being a data packet
3010 * not allowed by the destination peer.
3012 * @param peer Destination peer.
3014 * @return The next viable MeshPeerQueue element to send to that peer.
3015 * NULL when there are no transmittable messages.
3017 struct MeshPeerQueue *
3018 queue_get_next (const struct MeshPeerInfo *peer)
3020 struct MeshPeerQueue *q;
3022 struct GNUNET_MESH_Data *dmsg;
3023 struct MeshTunnel* t;
3027 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* selecting message\n");
3028 for (q = peer->queue_head; NULL != q; q = q->next)
3031 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3033 GNUNET_MESH_DEBUG_M2S (q->type));
3034 dmsg = (struct GNUNET_MESH_Data *) q->cls;
3035 pid = ntohl (dmsg->pid);
3038 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3039 ack = t->next_fc.last_ack_recv;
3041 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3042 ack = t->prev_fc.last_ack_recv;
3045 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3049 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3050 "* ACK: %u, PID: %u, MID: %llu\n",
3051 ack, pid, GNUNET_ntohll (dmsg->mid));
3052 if (GNUNET_NO == GMC_is_pid_bigger (pid, ack))
3054 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3060 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3064 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3065 "* nothing found\n");
3071 queue_send (void *cls, size_t size, void *buf)
3073 struct MeshPeerInfo *peer = cls;
3074 struct GNUNET_MessageHeader *msg;
3075 struct MeshPeerQueue *queue;
3076 struct MeshTunnel *t;
3077 struct GNUNET_PeerIdentity dst_id;
3078 struct MeshFlowControl *fc;
3083 peer->core_transmit = NULL;
3085 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Queue send\n");
3086 queue = queue_get_next (peer);
3088 /* Queue has no internal mesh traffic nor sendable payload */
3091 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not ready, return\n");
3092 if (NULL == peer->queue_head)
3093 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
3096 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not empty\n");
3098 GNUNET_PEER_resolve (peer->id, &dst_id);
3099 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3101 GNUNET_i2s (&dst_id));
3102 /* Check if buffer size is enough for the message */
3103 if (queue->size > size)
3105 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3106 "* not enough room, reissue\n");
3107 peer->core_transmit =
3108 GNUNET_CORE_notify_transmit_ready (core_handle,
3111 GNUNET_TIME_UNIT_FOREVER_REL,
3118 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* size ok\n");
3121 GNUNET_assert (0 < t->pending_messages);
3122 t->pending_messages--;
3126 switch (queue->type)
3129 case GNUNET_MESSAGE_TYPE_MESH_ACK:
3130 case GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK:
3131 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK:
3132 case GNUNET_MESSAGE_TYPE_MESH_POLL:
3133 case GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN:
3134 case GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY:
3135 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
3136 case GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE:
3137 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3139 GNUNET_MESH_DEBUG_M2S (queue->type));
3141 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3142 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3143 data_size = send_core_data_raw (queue->cls, size, buf);
3144 msg = (struct GNUNET_MessageHeader *) buf;
3145 type = ntohs (msg->type);
3147 case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
3148 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path create\n");
3149 data_size = send_core_path_create (queue->cls, size, buf);
3151 case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
3152 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n");
3153 data_size = send_core_path_ack (queue->cls, size, buf);
3157 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3158 "* type unknown: %u\n",
3163 if (0 < drop_percent &&
3164 GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
3166 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3167 "Dropping message of type %s\n",
3168 GNUNET_MESH_DEBUG_M2S(queue->type));
3171 /* Free queue, but cls was freed by send_core_* */
3172 queue_destroy (queue, GNUNET_NO);
3174 /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
3175 pid = ((struct GNUNET_MESH_Data *) buf)->pid;
3179 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3180 t->next_fc.last_pid_sent = pid;
3181 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST);
3183 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3184 t->prev_fc.last_pid_sent = pid;
3185 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
3191 if (GNUNET_YES == t->destroy && 0 == t->pending_messages)
3193 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying tunnel!\n");
3197 /* If more data in queue, send next */
3198 queue = queue_get_next (peer);
3201 struct GNUNET_PeerIdentity id;
3203 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* more data!\n");
3204 GNUNET_PEER_resolve (peer->id, &id);
3205 peer->core_transmit =
3206 GNUNET_CORE_notify_transmit_ready(core_handle,
3209 GNUNET_TIME_UNIT_FOREVER_REL,
3215 else if (NULL != peer->queue_head)
3217 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3219 GNUNET_i2s (&my_full_id));
3220 if (peer->id == t->next_hop)
3222 else if (peer->id == t->prev_hop)
3229 if (NULL != fc && GNUNET_SCHEDULER_NO_TASK == fc->poll_task)
3232 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
3236 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Return %d\n", data_size);
3242 * @brief Queue and pass message to core when possible.
3244 * If type is payload (UNICAST, TO_ORIGIN) checks for queue status and
3245 * accounts for it. In case the queue is full, the message is dropped and
3248 * Otherwise, message is treated as internal and allowed to go regardless of
3251 * @param cls Closure (@c type dependant). It will be used by queue_send to
3252 * build the message to be sent if not already prebuilt.
3253 * @param type Type of the message, 0 for a raw message.
3254 * @param size Size of the message.
3255 * @param dst Neighbor to send message to.
3256 * @param t Tunnel this message belongs to.
3259 queue_add (void *cls, uint16_t type, size_t size,
3260 struct MeshPeerInfo *dst, struct MeshTunnel *t)
3262 struct MeshPeerQueue *queue;
3263 struct GNUNET_PeerIdentity id;
3264 struct MeshFlowControl *fc;
3268 priority = GNUNET_NO;
3269 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type)
3273 else if (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type)
3279 if (fc->queue_n >= t->queue_max)
3281 /* If this isn't a retransmission, drop the message */
3282 if (GNUNET_NO == t->reliable ||
3283 (NULL == t->owner && GNUNET_MESSAGE_TYPE_MESH_UNICAST == type) ||
3284 (NULL == t->client && GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type))
3286 GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)",
3289 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3290 "queue full: %u/%u\n",
3291 fc->queue_n, t->queue_max);
3292 return; /* Drop this message */
3294 priority = GNUNET_YES;
3298 queue = GNUNET_malloc (sizeof (struct MeshPeerQueue));
3304 if (GNUNET_YES == priority)
3306 struct GNUNET_MESH_Data *d;
3310 GNUNET_CONTAINER_DLL_insert (dst->queue_head, dst->queue_tail, queue);
3311 d = (struct GNUNET_MESH_Data *) queue->cls;
3313 for (queue = dst->queue_tail; NULL != queue; queue = queue->prev)
3315 if (queue->type != type)
3317 d = (struct GNUNET_MESH_Data *) queue->cls;
3324 GNUNET_CONTAINER_DLL_insert_tail (dst->queue_head, dst->queue_tail, queue);
3325 if (NULL == dst->core_transmit)
3327 GNUNET_PEER_resolve (dst->id, &id);
3328 dst->core_transmit =
3329 GNUNET_CORE_notify_transmit_ready (core_handle,
3332 GNUNET_TIME_UNIT_FOREVER_REL,
3338 t->pending_messages++;
3342 /******************************************************************************/
3343 /******************** MESH NETWORK HANDLERS **************************/
3344 /******************************************************************************/
3348 * Core handler for path creation
3350 * @param cls closure
3351 * @param message message
3352 * @param peer peer identity this notification is about
3354 * @return GNUNET_OK to keep the connection open,
3355 * GNUNET_SYSERR to close it (signal serious error)
3358 handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer,
3359 const struct GNUNET_MessageHeader *message)
3361 unsigned int own_pos;
3364 MESH_TunnelNumber tid;
3365 struct GNUNET_MESH_CreateTunnel *msg;
3366 struct GNUNET_PeerIdentity *pi;
3367 struct MeshPeerPath *path;
3368 struct MeshPeerInfo *dest_peer_info;
3369 struct MeshPeerInfo *orig_peer_info;
3370 struct MeshTunnel *t;
3372 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3373 "Received a path create msg [%s]\n",
3374 GNUNET_i2s (&my_full_id));
3375 size = ntohs (message->size);
3376 if (size < sizeof (struct GNUNET_MESH_CreateTunnel))
3378 GNUNET_break_op (0);
3382 size -= sizeof (struct GNUNET_MESH_CreateTunnel);
3383 if (size % sizeof (struct GNUNET_PeerIdentity))
3385 GNUNET_break_op (0);
3388 size /= sizeof (struct GNUNET_PeerIdentity);
3391 GNUNET_break_op (0);
3394 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
3395 msg = (struct GNUNET_MESH_CreateTunnel *) message;
3397 tid = ntohl (msg->tid);
3398 pi = (struct GNUNET_PeerIdentity *) &msg[1];
3399 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3400 " path is for tunnel %s[%X].\n", GNUNET_i2s (pi), tid);
3401 t = tunnel_get (pi, tid);
3402 if (NULL == t) /* might be a local tunnel */
3406 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating tunnel\n");
3407 t = tunnel_new (GNUNET_PEER_intern (pi), tid, NULL, 0);
3413 t->port = ntohl (msg->port);
3414 opt = ntohl (msg->opt);
3415 if (0 != (opt & GNUNET_MESH_OPTION_NOBUFFER))
3417 t->nobuffer = GNUNET_YES;
3420 if (0 != (opt & GNUNET_MESH_OPTION_RELIABLE))
3422 t->reliable = GNUNET_YES;
3424 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " nobuffer:%d\n", t->nobuffer);
3426 tunnel_reset_timeout (t);
3428 t->state = MESH_TUNNEL_WAITING;
3430 GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey);
3431 if (NULL == dest_peer_info)
3433 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3434 " Creating PeerInfo for destination.\n");
3435 dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
3436 dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]);
3437 GNUNET_CONTAINER_multihashmap_put (peers, &pi[size - 1].hashPubKey,
3439 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
3441 orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey);
3442 if (NULL == orig_peer_info)
3444 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3445 " Creating PeerInfo for origin.\n");
3446 orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
3447 orig_peer_info->id = GNUNET_PEER_intern (pi);
3448 GNUNET_CONTAINER_multihashmap_put (peers, &pi->hashPubKey, orig_peer_info,
3449 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
3451 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
3452 path = path_new (size);
3454 for (i = 0; i < size; i++)
3456 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n",
3457 GNUNET_i2s (&pi[i]));
3458 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
3459 if (path->peers[i] == myid)
3462 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
3463 if (own_pos == 0 && path->peers[own_pos] != myid)
3465 /* create path: self not found in path through self */
3466 GNUNET_break_op (0);
3467 path_destroy (path);
3471 path_add_to_peers (path, GNUNET_NO);
3472 tunnel_use_path (t, path);
3474 peer_info_add_tunnel (dest_peer_info, t);
3476 if (own_pos == size - 1)
3478 struct MeshClient *c;
3480 /* Find target client */
3481 c = GNUNET_CONTAINER_multihashmap32_get (ports, t->port);
3484 /* TODO send reject */
3488 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
3489 peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_YES);
3491 /* Assign local tid */
3492 while (NULL != tunnel_get_incoming (next_local_tid))
3493 next_local_tid = (next_local_tid + 1) | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
3494 t->local_tid_dest = next_local_tid++;
3495 next_local_tid = next_local_tid | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
3497 if (GNUNET_YES == t->reliable)
3499 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
3500 t->bck_rel = GNUNET_malloc (sizeof (struct MeshTunnelReliability));
3502 t->bck_rel->expected_delay = MESH_RETRANSMIT_TIME;
3505 tunnel_add_client (t, c);
3506 send_client_tunnel_create (t);
3511 struct MeshPeerPath *path2;
3513 t->next_hop = path->peers[own_pos + 1];
3514 GNUNET_PEER_change_rc(t->next_hop, 1);
3516 /* It's for somebody else! Retransmit. */
3517 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
3518 path2 = path_duplicate (path);
3519 peer_info_add_path (dest_peer_info, path2, GNUNET_NO);
3520 peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_NO);
3521 send_create_path (t);
3529 * Core handler for path ACKs
3531 * @param cls closure
3532 * @param message message
3533 * @param peer peer identity this notification is about
3535 * @return GNUNET_OK to keep the connection open,
3536 * GNUNET_SYSERR to close it (signal serious error)
3539 handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
3540 const struct GNUNET_MessageHeader *message)
3542 struct GNUNET_MESH_PathACK *msg;
3543 struct MeshPeerInfo *peer_info;
3544 struct MeshPeerPath *p;
3545 struct MeshTunnel *t;
3547 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a path ACK msg [%s]\n",
3548 GNUNET_i2s (&my_full_id));
3549 msg = (struct GNUNET_MESH_PathACK *) message;
3550 t = tunnel_get (&msg->oid, ntohl(msg->tid));
3553 /* TODO notify that we don't know the tunnel */
3554 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel", 1, GNUNET_NO);
3555 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't know the tunnel %s [%X]!\n",
3556 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3559 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %s [%X]\n",
3560 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3562 peer_info = peer_get (&msg->peer_id);
3563 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by peer %s\n",
3564 GNUNET_i2s (&msg->peer_id));
3565 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n",
3568 /* Add path to peers? */
3572 path_add_to_peers (p, GNUNET_YES);
3578 t->state = MESH_TUNNEL_READY;
3579 t->next_fc.last_ack_recv = (NULL == t->client) ? ntohl (msg->ack) : 0;
3580 t->prev_fc.last_ack_sent = ntohl (msg->ack);
3582 /* Message for us? */
3583 if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity)))
3585 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
3586 if (NULL == t->owner)
3588 GNUNET_break_op (0);
3591 if (NULL != peer_info->dhtget)
3593 GNUNET_DHT_get_stop (peer_info->dhtget);
3594 peer_info->dhtget = NULL;
3596 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
3597 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
3601 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3602 " not for us, retransmitting...\n");
3603 peer_info = peer_get (&msg->oid);
3604 send_prebuilt_message (message, t->prev_hop, t);
3610 * Core handler for notifications of broken paths
3612 * @param cls closure
3613 * @param message message
3614 * @param peer peer identity this notification is about
3616 * @return GNUNET_OK to keep the connection open,
3617 * GNUNET_SYSERR to close it (signal serious error)
3620 handle_mesh_path_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
3621 const struct GNUNET_MessageHeader *message)
3623 struct GNUNET_MESH_PathBroken *msg;
3624 struct MeshTunnel *t;
3626 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3627 "Received a PATH BROKEN msg from %s\n", GNUNET_i2s (peer));
3628 msg = (struct GNUNET_MESH_PathBroken *) message;
3629 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
3630 GNUNET_i2s (&msg->peer1));
3631 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
3632 GNUNET_i2s (&msg->peer2));
3633 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3636 GNUNET_break_op (0);
3639 tunnel_notify_connection_broken (t, GNUNET_PEER_search (&msg->peer1),
3640 GNUNET_PEER_search (&msg->peer2));
3647 * Core handler for tunnel destruction
3649 * @param cls closure
3650 * @param message message
3651 * @param peer peer identity this notification is about
3653 * @return GNUNET_OK to keep the connection open,
3654 * GNUNET_SYSERR to close it (signal serious error)
3657 handle_mesh_tunnel_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
3658 const struct GNUNET_MessageHeader *message)
3660 struct GNUNET_MESH_TunnelDestroy *msg;
3661 struct MeshTunnel *t;
3663 msg = (struct GNUNET_MESH_TunnelDestroy *) message;
3664 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3665 "Got a TUNNEL DESTROY packet from %s\n",
3667 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3668 " for tunnel %s [%u]\n",
3669 GNUNET_i2s (&msg->oid), ntohl (msg->tid));
3670 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3673 /* Probably already got the message from another path,
3674 * destroyed the tunnel and retransmitted to children.
3677 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel",
3681 if (t->local_tid_dest >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
3683 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "INCOMING TUNNEL %X %X\n",
3684 t->local_tid, t->local_tid_dest);
3686 if (GNUNET_PEER_search (peer) == t->prev_hop)
3688 // TODO check owner's signature
3689 // TODO add owner's signatue to tunnel for retransmission
3690 peer_cancel_queues (t->prev_hop, t);
3691 GNUNET_PEER_change_rc (t->prev_hop, -1);
3694 else if (GNUNET_PEER_search (peer) == t->next_hop)
3696 // TODO check dest's signature
3697 // TODO add dest's signatue to tunnel for retransmission
3698 peer_cancel_queues (t->next_hop, t);
3699 GNUNET_PEER_change_rc (t->next_hop, -1);
3704 GNUNET_break_op (0);
3705 // TODO check both owner AND destination's signature to see which matches
3706 // TODO restransmit in appropriate direction
3709 tunnel_destroy_empty (t);
3711 // TODO: add timeout to destroy the tunnel anyway
3717 * Core handler for mesh network traffic going from the origin to a peer
3719 * @param cls closure
3720 * @param peer peer identity this notification is about
3721 * @param message message
3722 * @return GNUNET_OK to keep the connection open,
3723 * GNUNET_SYSERR to close it (signal serious error)
3726 handle_mesh_unicast (void *cls, const struct GNUNET_PeerIdentity *peer,
3727 const struct GNUNET_MessageHeader *message)
3729 struct GNUNET_MESH_Data *msg;
3730 struct MeshTunnel *t;
3735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a unicast packet from %s\n",
3738 size = ntohs (message->size);
3740 sizeof (struct GNUNET_MESH_Data) +
3741 sizeof (struct GNUNET_MessageHeader))
3746 msg = (struct GNUNET_MESH_Data *) message;
3747 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " of type %s\n",
3748 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
3750 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3753 /* TODO notify back: we don't know this tunnel */
3754 GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO);
3755 GNUNET_break_op (0);
3758 pid = ntohl (msg->pid);
3759 if (GMC_is_pid_bigger (pid, t->prev_fc.last_ack_sent))
3761 GNUNET_STATISTICS_update (stats, "# unsolicited unicast", 1, GNUNET_NO);
3762 GNUNET_break_op (0);
3763 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3764 "Received PID %u, (prev %u), ACK %u\n",
3765 pid, t->prev_fc.last_pid_recv, t->prev_fc.last_ack_sent);
3766 tunnel_send_fwd_ack(t, GNUNET_MESSAGE_TYPE_MESH_POLL);
3770 tunnel_reset_timeout (t);
3771 if (t->dest == myid)
3773 /* TODO signature verification */
3774 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3775 " it's for us! sending to clients...\n");
3776 GNUNET_STATISTICS_update (stats, "# unicast received", 1, GNUNET_NO);
3777 // if (GMC_is_pid_bigger(pid, t->prev_fc.last_pid_recv)) FIXME use
3778 if (GMC_is_pid_bigger (pid, t->prev_fc.last_pid_recv))
3782 mid = GNUNET_ntohll (msg->mid);
3783 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3784 " pid %u (%llu) not seen yet\n", pid, mid);
3785 t->prev_fc.last_pid_recv = pid;
3787 if (GNUNET_NO == t->reliable ||
3788 (mid >= t->bck_rel->mid_recv && mid < t->bck_rel->mid_recv + 64))
3790 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3791 "!!! RECV %llu\n", GNUNET_ntohll(msg->mid));
3792 if (GNUNET_YES == t->reliable)
3794 if (mid == t->bck_rel->mid_recv)
3795 t->bck_rel->mid_recv++;
3797 tunnel_send_client_ucast (t, msg);
3801 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3802 " MID %llu not expected (%llu), dropping!\n",
3803 GNUNET_ntohll (msg->mid), t->bck_rel->mid_recv);
3808 // GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO);
3809 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3810 " Pid %u not expected (%u), dropping!\n",
3811 pid, t->prev_fc.last_pid_recv + 1);
3813 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST);
3816 t->prev_fc.last_pid_recv = pid;
3817 if (0 == t->next_hop)
3822 ttl = ntohl (msg->ttl);
3823 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
3826 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
3827 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
3828 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
3831 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3832 " not for us, retransmitting...\n");
3834 send_prebuilt_message (message, t->next_hop, t);
3835 GNUNET_STATISTICS_update (stats, "# unicast forwarded", 1, GNUNET_NO);
3841 * Core handler for mesh network traffic toward the owner of a tunnel
3843 * @param cls closure
3844 * @param message message
3845 * @param peer peer identity this notification is about
3847 * @return GNUNET_OK to keep the connection open,
3848 * GNUNET_SYSERR to close it (signal serious error)
3851 handle_mesh_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
3852 const struct GNUNET_MessageHeader *message)
3854 struct GNUNET_MESH_Data *msg;
3855 struct MeshTunnel *t;
3860 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a ToOrigin packet from %s\n",
3862 size = ntohs (message->size);
3863 if (size < sizeof (struct GNUNET_MESH_Data) + /* Payload must be */
3864 sizeof (struct GNUNET_MessageHeader)) /* at least a header */
3866 GNUNET_break_op (0);
3869 msg = (struct GNUNET_MESH_Data *) message;
3870 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " of type %s\n",
3871 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
3872 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3873 pid = ntohl (msg->pid);
3876 /* TODO notify that we dont know this tunnel (whom)? */
3877 GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO);
3878 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3879 "Received to_origin with PID %u on unknown tunnel %s [%u]\n",
3880 pid, GNUNET_i2s (&msg->oid), ntohl (msg->tid));
3884 if (GMC_is_pid_bigger (pid, t->next_fc.last_ack_sent))
3886 GNUNET_STATISTICS_update (stats, "# unsolicited to_orig", 1, GNUNET_NO);
3887 GNUNET_break_op (0);
3888 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3889 "Received PID %u, ACK %u\n",
3890 pid, t->next_fc.last_ack_sent);
3891 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
3895 if (myid == t->id.oid)
3897 /* TODO signature verification */
3898 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3899 " it's for us! sending to clients...\n");
3900 GNUNET_STATISTICS_update (stats, "# to origin received", 1, GNUNET_NO);
3901 if ( (GNUNET_NO == t->reliable &&
3902 GMC_is_pid_bigger(pid, t->next_fc.last_pid_recv))
3904 (GNUNET_YES == t->reliable &&
3905 pid == t->next_fc.last_pid_recv + 1) ) // FIXME use "futures" as accepting
3907 t->next_fc.last_pid_recv = pid;
3908 tunnel_send_client_to_orig (t, msg);
3912 // GNUNET_STATISTICS_update (stats, "# duplicate PID drops BCK", 1, GNUNET_NO);
3913 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3914 " Pid %u not expected, sending FWD ACK!\n", pid);
3916 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
3919 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3920 " not for us, retransmitting...\n");
3921 t->next_fc.last_pid_recv = pid;
3922 if (0 == t->prev_hop) /* No owner AND no prev hop */
3924 if (GNUNET_YES == t->destroy)
3926 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3927 "to orig received on a dying tunnel %s [%X]\n",
3928 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3931 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3932 "unknown to origin at %s\n",
3933 GNUNET_i2s (&my_full_id));
3934 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3937 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3938 "on tunnel %s [%X]\n",
3939 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3942 ttl = ntohl (msg->ttl);
3943 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
3946 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
3947 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
3948 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
3951 send_prebuilt_message (message, t->prev_hop, t);
3952 GNUNET_STATISTICS_update (stats, "# to origin forwarded", 1, GNUNET_NO);
3959 * Core handler for mesh network traffic end-to-end ACKs.
3961 * @param cls Closure.
3962 * @param message Message.
3963 * @param peer Peer identity this notification is about.
3965 * @return GNUNET_OK to keep the connection open,
3966 * GNUNET_SYSERR to close it (signal serious error)
3969 handle_mesh_data_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
3970 const struct GNUNET_MessageHeader *message)
3972 struct GNUNET_MESH_DataACK *msg;
3973 struct MeshTunnelReliability *rel;
3974 struct MeshReliableMessage *copy;
3975 struct MeshReliableMessage *next;
3976 struct MeshTunnel *t;
3982 type = ntohs (message->type);
3983 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a %s message from %s!\n",
3984 GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer));
3985 msg = (struct GNUNET_MESH_DataACK *) message;
3987 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3990 /* TODO notify that we dont know this tunnel (whom)? */
3991 GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO);
3994 ack = GNUNET_ntohll (msg->mid);
3995 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %llu\n", ack);
3997 /* Is this a forward or backward ACK? */
3998 id = GNUNET_PEER_search (peer);
3999 if (t->next_hop == id && GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK == type)
4001 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
4002 if (NULL == t->owner)
4004 send_prebuilt_message (message, t->prev_hop, t);
4008 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST);
4010 else if (t->prev_hop == id && GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK == type)
4012 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
4013 if (NULL == t->client)
4015 send_prebuilt_message (message, t->next_hop, t);
4019 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
4023 GNUNET_break_op (0);
4027 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! ACK %llu\n", ack);
4028 for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next)
4030 struct GNUNET_TIME_Relative time;
4032 if (copy->mid > ack)
4034 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! head %llu, out!\n", copy->mid);
4038 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! id %llu\n", copy->mid);
4040 time = GNUNET_TIME_absolute_get_duration (copy->timestamp);
4041 rel->expected_delay.rel_value += time.rel_value;
4042 rel->expected_delay.rel_value /= 2;
4044 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! new expected delay %s\n",
4045 GNUNET_STRINGS_relative_time_to_string (rel->expected_delay,
4047 rel->retry_timer = rel->expected_delay;
4048 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
4052 if (GNUNET_YES == work)
4054 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
4056 GNUNET_SCHEDULER_cancel (rel->retry_task);
4057 if (NULL == rel->head_sent)
4059 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
4063 struct GNUNET_TIME_Absolute new_target;
4064 struct GNUNET_TIME_Relative delay;
4066 delay = GNUNET_TIME_relative_multiply (rel->retry_timer,
4067 MESH_RETRANSMIT_MARGIN);
4068 new_target = GNUNET_TIME_absolute_add (rel->head_sent->timestamp,
4070 delay = GNUNET_TIME_absolute_get_remaining (new_target);
4072 GNUNET_SCHEDULER_add_delayed (delay,
4073 &tunnel_retransmit_message,
4084 * Core handler for mesh network traffic point-to-point acks.
4086 * @param cls closure
4087 * @param message message
4088 * @param peer peer identity this notification is about
4090 * @return GNUNET_OK to keep the connection open,
4091 * GNUNET_SYSERR to close it (signal serious error)
4094 handle_mesh_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
4095 const struct GNUNET_MessageHeader *message)
4097 struct GNUNET_MESH_ACK *msg;
4098 struct MeshTunnel *t;
4099 struct MeshFlowControl *fc;
4103 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
4105 msg = (struct GNUNET_MESH_ACK *) message;
4107 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4111 /* TODO notify that we dont know this tunnel (whom)? */
4112 GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO);
4115 ack = ntohl (msg->pid);
4116 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
4118 /* Is this a forward or backward ACK? */
4119 id = GNUNET_PEER_search (peer);
4120 if (t->next_hop == id)
4123 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
4126 else if (t->prev_hop == id)
4129 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
4134 GNUNET_break_op (0);
4138 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task &&
4139 GMC_is_pid_bigger (ack, fc->last_ack_recv))
4141 GNUNET_SCHEDULER_cancel (fc->poll_task);
4142 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
4143 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
4145 fc->last_ack_recv = ack;
4146 peer_unlock_queue (id);
4148 if (t->next_hop == id)
4149 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
4151 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
4158 * Core handler for mesh network traffic point-to-point ack polls.
4160 * @param cls closure
4161 * @param message message
4162 * @param peer peer identity this notification is about
4164 * @return GNUNET_OK to keep the connection open,
4165 * GNUNET_SYSERR to close it (signal serious error)
4168 handle_mesh_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
4169 const struct GNUNET_MessageHeader *message)
4171 struct GNUNET_MESH_Poll *msg;
4172 struct MeshTunnel *t;
4173 struct MeshFlowControl *fc;
4178 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an POLL packet from %s!\n",
4181 msg = (struct GNUNET_MESH_Poll *) message;
4183 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4187 /* TODO notify that we dont know this tunnel (whom)? */
4188 GNUNET_STATISTICS_update (stats, "# poll on unknown tunnel", 1, GNUNET_NO);
4189 GNUNET_break_op (0);
4193 /* Is this a forward or backward ACK? */
4194 id = GNUNET_PEER_search(peer);
4195 pid = ntohl (msg->pid);
4196 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PID %u\n", pid);
4197 if (t->next_hop == id)
4199 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from FWD\n");
4200 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " was %u\n", t->next_fc.last_pid_recv);
4202 old = fc->last_pid_recv;
4203 fc->last_pid_recv = pid;
4204 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
4206 else if (t->prev_hop == id)
4208 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from BCK\n");
4209 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " was %u\n", t->prev_fc.last_pid_recv);
4211 old = fc->last_pid_recv;
4212 fc->last_pid_recv = pid;
4213 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
4218 if (GNUNET_YES == t->reliable)
4219 fc->last_pid_recv = old;
4226 * Core handler for mesh keepalives.
4228 * @param cls closure
4229 * @param message message
4230 * @param peer peer identity this notification is about
4231 * @return GNUNET_OK to keep the connection open,
4232 * GNUNET_SYSERR to close it (signal serious error)
4234 * TODO: Check who we got this from, to validate route.
4237 handle_mesh_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
4238 const struct GNUNET_MessageHeader *message)
4240 struct GNUNET_MESH_TunnelKeepAlive *msg;
4241 struct MeshTunnel *t;
4243 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
4246 msg = (struct GNUNET_MESH_TunnelKeepAlive *) message;
4247 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4251 /* TODO notify that we dont know that tunnel */
4252 GNUNET_STATISTICS_update (stats, "# keepalive on unknown tunnel", 1,
4257 tunnel_reset_timeout (t);
4258 if (NULL != t->client || 0 == t->next_hop || myid == t->next_hop)
4261 GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
4262 send_prebuilt_message (message, t->next_hop, t);
4269 * Functions to handle messages from core
4271 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
4272 {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0},
4273 {&handle_mesh_path_broken, GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN,
4274 sizeof (struct GNUNET_MESH_PathBroken)},
4275 {&handle_mesh_tunnel_destroy, GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY,
4276 sizeof (struct GNUNET_MESH_TunnelDestroy)},
4277 {&handle_mesh_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
4278 {&handle_mesh_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
4279 {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK,
4280 sizeof (struct GNUNET_MESH_DataACK)},
4281 {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK,
4282 sizeof (struct GNUNET_MESH_DataACK)},
4283 {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE,
4284 sizeof (struct GNUNET_MESH_TunnelKeepAlive)},
4285 {&handle_mesh_ack, GNUNET_MESSAGE_TYPE_MESH_ACK,
4286 sizeof (struct GNUNET_MESH_ACK)},
4287 {&handle_mesh_poll, GNUNET_MESSAGE_TYPE_MESH_POLL,
4288 sizeof (struct GNUNET_MESH_Poll)},
4289 {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
4290 sizeof (struct GNUNET_MESH_PathACK)},
4296 /******************************************************************************/
4297 /**************** MESH LOCAL HANDLER HELPERS ***********************/
4298 /******************************************************************************/
4303 * notify_client_connection_failure: notify a client that the connection to the
4304 * requested remote peer is not possible (for instance, no route found)
4305 * Function called when the socket is ready to queue more data. "buf" will be
4306 * NULL and "size" zero if the socket was closed for writing in the meantime.
4308 * @param cls closure
4309 * @param size number of bytes available in buf
4310 * @param buf where the callee should write the message
4311 * @return number of bytes written to buf
4314 notify_client_connection_failure (void *cls, size_t size, void *buf)
4317 struct MeshPeerInfo *peer_info;
4318 struct GNUNET_MESH_PeerControl *msg;
4319 struct GNUNET_PeerIdentity id;
4321 if (0 == size && NULL == buf)
4323 // TODO retry? cancel?
4327 size_needed = sizeof (struct GNUNET_MESH_PeerControl);
4328 peer_info = (struct MeshPeerInfo *) cls;
4329 msg = (struct GNUNET_MESH_PeerControl *) buf;
4330 msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
4331 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED);
4332 // msg->tunnel_id = htonl(peer_info->t->tid);
4333 GNUNET_PEER_resolve (peer_info->id, &id);
4334 memcpy (&msg->peer, &id, sizeof (struct GNUNET_PeerIdentity));
4342 * Send keepalive packets for a tunnel.
4344 * @param cls Closure (tunnel for which to send the keepalive).
4345 * @param tc Notification context.
4347 * FIXME: add a refresh reset in case of normal unicast traffic is doing the job
4350 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4352 struct MeshTunnel *t = cls;
4353 struct GNUNET_MESH_TunnelKeepAlive *msg;
4354 size_t size = sizeof (struct GNUNET_MESH_TunnelKeepAlive);
4357 t->maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4358 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) ||
4359 NULL == t->owner || 0 == t->local_tid)
4364 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4365 "sending keepalive for tunnel %d\n", t->id.tid);
4367 msg = (struct GNUNET_MESH_TunnelKeepAlive *) cbuf;
4368 msg->header.size = htons (size);
4369 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE);
4370 msg->oid = my_full_id;
4371 msg->tid = htonl (t->id.tid);
4372 send_prebuilt_message (&msg->header, t->next_hop, t);
4374 t->maintenance_task =
4375 GNUNET_SCHEDULER_add_delayed (refresh_path_time, &path_refresh, t);
4380 * Function to process paths received for a new peer addition. The recorded
4381 * paths form the initial tunnel, which can be optimized later.
4382 * Called on each result obtained for the DHT search.
4384 * @param cls closure
4385 * @param exp when will this value expire
4386 * @param key key of the result
4387 * @param get_path path of the get request
4388 * @param get_path_length lenght of get_path
4389 * @param put_path path of the put request
4390 * @param put_path_length length of the put_path
4391 * @param type type of the result
4392 * @param size number of bytes in data
4393 * @param data pointer to the result data
4396 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
4397 const struct GNUNET_HashCode * key,
4398 const struct GNUNET_PeerIdentity *get_path,
4399 unsigned int get_path_length,
4400 const struct GNUNET_PeerIdentity *put_path,
4401 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
4402 size_t size, const void *data)
4404 struct MeshPeerInfo *peer = cls;
4405 struct MeshPeerPath *p;
4406 struct GNUNET_PeerIdentity pi;
4409 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got results from DHT!\n");
4410 GNUNET_PEER_resolve (peer->id, &pi);
4411 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&pi));
4413 p = path_build_from_dht (get_path, get_path_length,
4414 put_path, put_path_length);
4415 path_add_to_peers (p, GNUNET_NO);
4417 for (i = 0; i < peer->ntunnels; i++)
4419 struct GNUNET_PeerIdentity id;
4421 GNUNET_PEER_resolve (peer->tunnels[i]->id.oid, &id);
4422 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... tunnel %s:%X (%X / %X)\n",
4423 GNUNET_i2s (&id), peer->tunnels[i]->id.tid,
4424 peer->tunnels[i]->local_tid,
4425 peer->tunnels[i]->local_tid_dest);
4426 if (peer->tunnels[i]->state == MESH_TUNNEL_SEARCHING)
4428 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
4429 peer_connect (peer, peer->tunnels[i]);
4437 /******************************************************************************/
4438 /********************* MESH LOCAL HANDLES **************************/
4439 /******************************************************************************/
4443 * Handler for client connection.
4445 * @param cls Closure (unused).
4446 * @param client Client handler.
4449 handle_local_client_connect (void *cls, struct GNUNET_SERVER_Client *client)
4451 struct MeshClient *c;
4455 c = GNUNET_malloc (sizeof (struct MeshClient));
4457 GNUNET_SERVER_client_keep (client);
4458 GNUNET_SERVER_client_set_user_context (client, c);
4459 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, c);
4464 * Handler for client disconnection
4466 * @param cls closure
4467 * @param client identification of the client; NULL
4468 * for the last call when the server is destroyed
4471 handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
4473 struct MeshClient *c;
4474 struct MeshClient *next;
4476 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected: %p\n", client);
4479 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (SERVER DOWN)\n");
4483 c = client_get (client);
4486 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "matching client found (%u)\n",
4488 GNUNET_SERVER_client_drop (c->handle);
4489 c->shutting_down = GNUNET_YES;
4490 if (NULL != c->own_tunnels)
4492 GNUNET_CONTAINER_multihashmap32_iterate (c->own_tunnels,
4493 &tunnel_destroy_iterator, c);
4494 GNUNET_CONTAINER_multihashmap32_destroy (c->own_tunnels);
4497 if (NULL != c->incoming_tunnels)
4499 GNUNET_CONTAINER_multihashmap32_iterate (c->incoming_tunnels,
4500 &tunnel_destroy_iterator, c);
4501 GNUNET_CONTAINER_multihashmap32_destroy (c->incoming_tunnels);
4504 if (NULL != c->ports)
4505 GNUNET_CONTAINER_multihashmap32_destroy (c->ports);
4507 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, c);
4508 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " CLIENT FREE at %p\n", c);
4510 GNUNET_STATISTICS_update (stats, "# clients", -1, GNUNET_NO);
4515 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " context NULL!\n");
4517 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "done!\n");
4523 * Handler for new clients
4525 * @param cls closure
4526 * @param client identification of the client
4527 * @param message the actual message, which includes messages the client wants
4530 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
4531 const struct GNUNET_MessageHeader *message)
4533 struct GNUNET_MESH_ClientConnect *cc_msg;
4534 struct MeshClient *c;
4539 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client connected %p\n", client);
4541 /* Check data sanity */
4542 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
4543 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
4544 if (0 != (size % sizeof (uint32_t)))
4547 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4550 size /= sizeof (uint32_t);
4552 /* Initialize new client structure */
4553 c = GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
4554 c->id = next_client_id++; /* overflow not important: just for debug */
4555 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client id %u\n", c->id);
4556 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client has %u ports\n", size);
4561 p = (uint32_t *) &cc_msg[1];
4562 c->ports = GNUNET_CONTAINER_multihashmap32_create (size);
4563 for (i = 0; i < size; i++)
4566 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port: %u\n", u32);
4568 /* store in client's hashmap */
4569 GNUNET_CONTAINER_multihashmap32_put (c->ports, u32, c,
4570 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
4571 /* store in global hashmap */
4572 /* FIXME only allow one client to have the port open,
4573 * have a backup hashmap with waiting clients */
4574 GNUNET_CONTAINER_multihashmap32_put (ports, u32, c,
4575 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
4579 c->own_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
4580 c->incoming_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
4581 GNUNET_SERVER_notification_context_add (nc, client);
4582 GNUNET_STATISTICS_update (stats, "# clients", 1, GNUNET_NO);
4584 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4585 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client processed\n");
4590 * Handler for requests of new tunnels
4592 * @param cls Closure.
4593 * @param client Identification of the client.
4594 * @param message The actual message.
4597 handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client,
4598 const struct GNUNET_MessageHeader *message)
4600 struct GNUNET_MESH_TunnelMessage *t_msg;
4601 struct MeshPeerInfo *peer_info;
4602 struct MeshTunnel *t;
4603 struct MeshClient *c;
4604 MESH_TunnelNumber tid;
4606 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new tunnel requested\n");
4608 /* Sanity check for client registration */
4609 if (NULL == (c = client_get (client)))
4612 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4615 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4617 /* Message size sanity check */
4618 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
4621 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4625 t_msg = (struct GNUNET_MESH_TunnelMessage *) message;
4626 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n",
4627 GNUNET_i2s (&t_msg->peer));
4628 /* Sanity check for tunnel numbering */
4629 tid = ntohl (t_msg->tunnel_id);
4630 if (0 == (tid & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI))
4633 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4636 /* Sanity check for duplicate tunnel IDs */
4637 if (NULL != tunnel_get_by_local_id (c, tid))
4640 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4645 while (NULL != tunnel_get_by_pi (myid, next_tid))
4646 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
4647 t = tunnel_new (myid, next_tid, c, tid);
4648 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
4652 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4655 t->port = ntohl (t_msg->port);
4656 tunnel_set_options (t, ntohl (t_msg->options));
4657 if (GNUNET_YES == t->reliable)
4659 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
4660 t->fwd_rel = GNUNET_malloc (sizeof (struct MeshTunnelReliability));
4662 t->fwd_rel->expected_delay = MESH_RETRANSMIT_TIME;
4665 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATED TUNNEL %s[%x]:%u (%x)\n",
4666 GNUNET_i2s (&my_full_id), t->id.tid, t->port, t->local_tid);
4668 peer_info = peer_get (&t_msg->peer);
4669 peer_info_add_tunnel (peer_info, t);
4670 peer_connect (peer_info, t);
4671 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4677 * Handler for requests of deleting tunnels
4679 * @param cls closure
4680 * @param client identification of the client
4681 * @param message the actual message
4684 handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
4685 const struct GNUNET_MessageHeader *message)
4687 struct GNUNET_MESH_TunnelMessage *tunnel_msg;
4688 struct MeshClient *c;
4689 struct MeshTunnel *t;
4690 MESH_TunnelNumber tid;
4692 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4693 "Got a DESTROY TUNNEL from client!\n");
4695 /* Sanity check for client registration */
4696 if (NULL == (c = client_get (client)))
4699 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4702 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4704 /* Message sanity check */
4705 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
4708 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4712 tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message;
4714 /* Retrieve tunnel */
4715 tid = ntohl (tunnel_msg->tunnel_id);
4716 t = tunnel_get_by_local_id(c, tid);
4719 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " tunnel %X not found\n", tid);
4721 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4725 /* Cleanup after the tunnel */
4726 client_delete_tunnel (c, t);
4733 peer_info_remove_tunnel (peer_get_short (t->dest), t);
4737 /* The tunnel will be destroyed when the last message is transmitted. */
4738 tunnel_destroy_empty (t);
4740 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4746 * Handler for client traffic
4748 * @param cls closure
4749 * @param client identification of the client
4750 * @param message the actual message
4753 handle_local_data (void *cls, struct GNUNET_SERVER_Client *client,
4754 const struct GNUNET_MessageHeader *message)
4756 struct GNUNET_MESH_LocalData *data_msg;
4757 struct MeshClient *c;
4758 struct MeshTunnel *t;
4759 struct MeshFlowControl *fc;
4760 MESH_TunnelNumber tid;
4763 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4764 "Got data from a client!\n");
4766 /* Sanity check for client registration */
4767 if (NULL == (c = client_get (client)))
4770 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4773 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4775 data_msg = (struct GNUNET_MESH_LocalData *) message;
4777 /* Sanity check for message size */
4778 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_LocalData);
4779 if (size < sizeof (struct GNUNET_MessageHeader))
4782 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4786 /* Tunnel exists? */
4787 tid = ntohl (data_msg->tid);
4788 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI)
4791 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4794 t = tunnel_get_by_local_id (c, tid);
4798 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4802 /* Is the client in the tunnel? */
4803 if ( !( (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV &&
4805 t->owner->handle == client)
4807 (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV &&
4809 t->client->handle == client) ) )
4812 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4816 /* Ok, everything is correct, send the message
4817 * (pretend we got it from a mesh peer)
4820 struct GNUNET_MESH_Data *payload;
4821 char cbuf[sizeof(struct GNUNET_MESH_Data) + size];
4823 fc = tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV ? &t->prev_fc : &t->next_fc;
4824 if (GNUNET_YES == t->reliable)
4826 struct MeshTunnelReliability *rel;
4827 struct MeshReliableMessage *copy;
4829 rel = (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) ? t->fwd_rel : t->bck_rel;
4830 copy = GNUNET_malloc (sizeof (struct MeshReliableMessage)
4831 + sizeof(struct GNUNET_MESH_Data)
4833 copy->mid = rel->mid_sent++;
4834 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! DATA %llu\n", copy->mid);
4835 copy->timestamp = GNUNET_TIME_absolute_get ();
4838 GNUNET_CONTAINER_DLL_insert_tail (rel->head_sent, rel->tail_sent, copy);
4839 if (GNUNET_SCHEDULER_NO_TASK == rel->retry_task)
4842 GNUNET_TIME_relative_multiply (rel->expected_delay,
4843 MESH_RETRANSMIT_MARGIN);
4845 GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
4846 &tunnel_retransmit_message,
4849 payload = (struct GNUNET_MESH_Data *) ©[1];
4850 payload->mid = GNUNET_htonll (copy->mid);
4854 payload = (struct GNUNET_MESH_Data *) cbuf;
4856 // FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
4857 // use different struct for unreliable traffic, save 8 bytes
4859 memcpy (&payload[1], &data_msg[1], size);
4860 payload->header.size = htons (sizeof (struct GNUNET_MESH_Data) + size);
4861 payload->header.type = htons (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV ?
4862 GNUNET_MESSAGE_TYPE_MESH_UNICAST :
4863 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
4864 GNUNET_PEER_resolve(t->id.oid, &payload->oid);;
4865 payload->tid = htonl (t->id.tid);
4866 payload->ttl = htonl (default_ttl);
4867 payload->pid = htonl (fc->last_pid_recv + 1);
4868 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4869 " calling generic handler...\n");
4870 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
4871 handle_mesh_unicast (NULL, &my_full_id, &payload->header);
4873 handle_mesh_to_orig (NULL, &my_full_id, &payload->header);
4875 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "receive done OK\n");
4876 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4883 * Handler for client's ACKs for payload traffic.
4885 * @param cls Closure (unused).
4886 * @param client Identification of the client.
4887 * @param message The actual message.
4890 handle_local_ack (void *cls, struct GNUNET_SERVER_Client *client,
4891 const struct GNUNET_MessageHeader *message)
4893 struct GNUNET_MESH_LocalAck *msg;
4894 struct MeshTunnel *t;
4895 struct MeshClient *c;
4896 MESH_TunnelNumber tid;
4898 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a local ACK\n");
4899 /* Sanity check for client registration */
4900 if (NULL == (c = client_get (client)))
4903 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4906 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4908 msg = (struct GNUNET_MESH_LocalAck *) message;
4910 /* Tunnel exists? */
4911 tid = ntohl (msg->tunnel_id);
4912 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", tid);
4913 t = tunnel_get_by_local_id (c, tid);
4917 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Tunnel %X unknown.\n", tid);
4918 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id);
4919 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4923 /* Does client own tunnel? I.E: Is this an ACK for BCK traffic? */
4926 /* The client owns the tunnel, ACK is for data to_origin, send BCK ACK. */
4927 t->prev_fc.last_ack_recv++;
4928 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
4932 /* The client doesn't own the tunnel, this ACK is for FWD traffic. */
4933 t->next_fc.last_ack_recv++;
4934 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
4937 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4945 * Iterator over all tunnels to send a monitoring client info about each tunnel.
4947 * @param cls Closure (client handle).
4948 * @param key Key (hashed tunnel ID, unused).
4949 * @param value Tunnel info.
4951 * @return GNUNET_YES, to keep iterating.
4954 monitor_all_tunnels_iterator (void *cls,
4955 const struct GNUNET_HashCode * key,
4958 struct GNUNET_SERVER_Client *client = cls;
4959 struct MeshTunnel *t = value;
4960 struct GNUNET_MESH_LocalMonitor *msg;
4962 msg = GNUNET_malloc (sizeof(struct GNUNET_MESH_LocalMonitor));
4963 GNUNET_PEER_resolve(t->id.oid, &msg->owner);
4964 msg->tunnel_id = htonl (t->id.tid);
4965 msg->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
4966 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS);
4967 GNUNET_PEER_resolve (t->dest, &msg->destination);
4969 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4970 "* sending info about tunnel %s [%u]\n",
4971 GNUNET_i2s (&msg->owner), t->id.tid);
4973 GNUNET_SERVER_notification_context_unicast (nc, client,
4974 &msg->header, GNUNET_NO);
4980 * Handler for client's MONITOR request.
4982 * @param cls Closure (unused).
4983 * @param client Identification of the client.
4984 * @param message The actual message.
4987 handle_local_get_tunnels (void *cls, struct GNUNET_SERVER_Client *client,
4988 const struct GNUNET_MessageHeader *message)
4990 struct MeshClient *c;
4992 /* Sanity check for client registration */
4993 if (NULL == (c = client_get (client)))
4996 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5000 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5001 "Received get tunnels request from client %u\n",
5003 GNUNET_CONTAINER_multihashmap_iterate (tunnels,
5004 monitor_all_tunnels_iterator,
5006 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5007 "Get tunnels request from client %u completed\n",
5009 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5014 * Handler for client's MONITOR_TUNNEL request.
5016 * @param cls Closure (unused).
5017 * @param client Identification of the client.
5018 * @param message The actual message.
5021 handle_local_show_tunnel (void *cls, struct GNUNET_SERVER_Client *client,
5022 const struct GNUNET_MessageHeader *message)
5024 const struct GNUNET_MESH_LocalMonitor *msg;
5025 struct GNUNET_MESH_LocalMonitor *resp;
5026 struct MeshClient *c;
5027 struct MeshTunnel *t;
5029 /* Sanity check for client registration */
5030 if (NULL == (c = client_get (client)))
5033 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5037 msg = (struct GNUNET_MESH_LocalMonitor *) message;
5038 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5039 "Received tunnel info request from client %u for tunnel %s[%X]\n",
5042 ntohl (msg->tunnel_id));
5043 t = tunnel_get (&msg->owner, ntohl (msg->tunnel_id));
5046 /* We don't know the tunnel FIXME */
5047 struct GNUNET_MESH_LocalMonitor warn;
5050 GNUNET_SERVER_notification_context_unicast (nc, client,
5053 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5057 /* Initialize context */
5058 resp = GNUNET_malloc (sizeof (struct GNUNET_MESH_LocalMonitor));
5060 GNUNET_PEER_resolve (t->dest, &resp->destination);
5061 resp->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
5062 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
5063 &resp->header, GNUNET_NO);
5066 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5067 "Monitor tunnel request from client %u completed\n",
5069 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5074 * Functions to handle messages from clients
5076 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
5077 {&handle_local_new_client, NULL,
5078 GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
5079 {&handle_local_tunnel_create, NULL,
5080 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE,
5081 sizeof (struct GNUNET_MESH_TunnelMessage)},
5082 {&handle_local_tunnel_destroy, NULL,
5083 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY,
5084 sizeof (struct GNUNET_MESH_TunnelMessage)},
5085 {&handle_local_data, NULL,
5086 GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA, 0},
5087 {&handle_local_ack, NULL,
5088 GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK,
5089 sizeof (struct GNUNET_MESH_LocalAck)},
5090 {&handle_local_get_tunnels, NULL,
5091 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS,
5092 sizeof (struct GNUNET_MessageHeader)},
5093 {&handle_local_show_tunnel, NULL,
5094 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL,
5095 sizeof (struct GNUNET_MESH_LocalMonitor)},
5101 * Method called whenever a given peer connects.
5103 * @param cls closure
5104 * @param peer peer identity this notification is about
5107 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
5109 struct MeshPeerInfo *peer_info;
5110 struct MeshPeerPath *path;
5112 DEBUG_CONN ("Peer connected\n");
5113 DEBUG_CONN (" %s\n", GNUNET_i2s (&my_full_id));
5114 peer_info = peer_get (peer);
5115 if (myid == peer_info->id)
5117 DEBUG_CONN (" (self)\n");
5118 path = path_new (1);
5122 DEBUG_CONN (" %s\n", GNUNET_i2s (peer));
5123 path = path_new (2);
5124 path->peers[1] = peer_info->id;
5125 GNUNET_PEER_change_rc (peer_info->id, 1);
5126 GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO);
5128 path->peers[0] = myid;
5129 GNUNET_PEER_change_rc (myid, 1);
5130 peer_info_add_path (peer_info, path, GNUNET_YES);
5136 * Method called whenever a peer disconnects.
5138 * @param cls closure
5139 * @param peer peer identity this notification is about
5142 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
5144 struct MeshPeerInfo *pi;
5145 struct MeshPeerQueue *q;
5146 struct MeshPeerQueue *n;
5148 DEBUG_CONN ("Peer disconnected\n");
5149 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
5159 /* TODO try to reroute this traffic instead */
5160 queue_destroy(q, GNUNET_YES);
5163 if (NULL != pi->core_transmit)
5165 GNUNET_CORE_notify_transmit_ready_cancel(pi->core_transmit);
5166 pi->core_transmit = NULL;
5168 peer_remove_path (pi, pi->id, myid);
5171 DEBUG_CONN (" (self)\n");
5173 GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO);
5179 * Install server (service) handlers and start listening to clients.
5184 GNUNET_SERVER_add_handlers (server_handle, client_handlers);
5185 GNUNET_SERVER_connect_notify (server_handle,
5186 &handle_local_client_connect, NULL);
5187 GNUNET_SERVER_disconnect_notify (server_handle,
5188 &handle_local_client_disconnect, NULL);
5189 nc = GNUNET_SERVER_notification_context_create (server_handle, 1);
5191 clients_head = NULL;
5192 clients_tail = NULL;
5194 GNUNET_SERVER_resume (server_handle);
5199 * To be called on core init/fail.
5201 * @param cls Closure (config)
5202 * @param server handle to the server for this service
5203 * @param identity the public identity of this peer
5206 core_init (void *cls, struct GNUNET_CORE_Handle *server,
5207 const struct GNUNET_PeerIdentity *identity)
5209 const struct GNUNET_CONFIGURATION_Handle *c = cls;
5212 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
5213 GNUNET_break (core_handle == server);
5214 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)) ||
5217 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
5218 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5220 GNUNET_i2s (identity));
5221 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5223 GNUNET_i2s (&my_full_id));
5224 GNUNET_CORE_disconnect (core_handle);
5225 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
5226 NULL, /* Closure passed to MESH functions */
5227 &core_init, /* Call core_init once connected */
5228 &core_connect, /* Handle connects */
5229 &core_disconnect, /* remove peers on disconnects */
5230 NULL, /* Don't notify about all incoming messages */
5231 GNUNET_NO, /* For header only in notification */
5232 NULL, /* Don't notify about all outbound messages */
5233 GNUNET_NO, /* For header-only out notification */
5234 core_handlers); /* Register these handlers */
5243 /******************************************************************************/
5244 /************************ MAIN FUNCTIONS ****************************/
5245 /******************************************************************************/
5248 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
5250 * @param cls closure
5251 * @param key current key code
5252 * @param value value in the hash map
5253 * @return GNUNET_YES if we should continue to iterate,
5257 shutdown_tunnel (void *cls, const struct GNUNET_HashCode * key, void *value)
5259 struct MeshTunnel *t = value;
5266 * Iterator over peer hash map entries to destroy the tunnel during shutdown.
5268 * @param cls closure
5269 * @param key current key code
5270 * @param value value in the hash map
5271 * @return GNUNET_YES if we should continue to iterate,
5275 shutdown_peer (void *cls, const struct GNUNET_HashCode * key, void *value)
5277 struct MeshPeerInfo *p = value;
5278 struct MeshPeerQueue *q;
5279 struct MeshPeerQueue *n;
5287 queue_destroy(q, GNUNET_YES);
5291 peer_info_destroy (p);
5297 * Task run during shutdown.
5303 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
5305 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n");
5307 if (core_handle != NULL)
5309 GNUNET_CORE_disconnect (core_handle);
5312 GNUNET_CONTAINER_multihashmap_iterate (tunnels, &shutdown_tunnel, NULL);
5313 GNUNET_CONTAINER_multihashmap_iterate (peers, &shutdown_peer, NULL);
5314 if (dht_handle != NULL)
5316 GNUNET_DHT_disconnect (dht_handle);
5321 GNUNET_SERVER_notification_context_destroy (nc);
5324 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
5326 GNUNET_SCHEDULER_cancel (announce_id_task);
5327 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
5329 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shut down\n");
5334 * Process mesh requests.
5336 * @param cls closure
5337 * @param server the initialized server
5338 * @param c configuration to use
5341 run (void *cls, struct GNUNET_SERVER_Handle *server,
5342 const struct GNUNET_CONFIGURATION_Handle *c)
5345 struct GNUNET_CRYPTO_EccPrivateKey *pk;
5347 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n");
5348 server_handle = server;
5349 GNUNET_SERVER_suspend (server_handle);
5352 GNUNET_CONFIGURATION_get_value_filename (c, "PEER", "PRIVATE_KEY",
5355 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5357 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5358 "mesh", "peer/privatekey");
5359 GNUNET_SCHEDULER_shutdown ();
5364 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_PATH_TIME",
5365 &refresh_path_time))
5367 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5369 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5370 "mesh", "refresh path time");
5371 GNUNET_SCHEDULER_shutdown ();
5376 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "ID_ANNOUNCE_TIME",
5379 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5381 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5382 "mesh", "id announce time");
5383 GNUNET_SCHEDULER_shutdown ();
5388 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "CONNECT_TIMEOUT",
5391 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5393 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5394 "mesh", "connect timeout");
5395 GNUNET_SCHEDULER_shutdown ();
5400 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
5403 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5405 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5406 "mesh", "max msgs queue");
5407 GNUNET_SCHEDULER_shutdown ();
5412 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_TUNNELS",
5415 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5417 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5418 "mesh", "max tunnels");
5419 GNUNET_SCHEDULER_shutdown ();
5424 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
5427 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5429 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5430 "mesh", "default ttl", 64);
5435 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_PEERS",
5438 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5439 _("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5440 "mesh", "max peers", 1000);
5445 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DROP_PERCENT",
5452 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5453 "Mesh is running with drop mode enabled. "
5454 "This is NOT a good idea! "
5455 "Remove the DROP_PERCENT option from your configuration.\n");
5459 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DHT_REPLICATION_LEVEL",
5460 &dht_replication_level))
5462 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5464 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5465 "mesh", "dht replication level", 3);
5466 dht_replication_level = 3;
5469 tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
5470 incoming_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
5471 peers = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
5472 ports = GNUNET_CONTAINER_multihashmap32_create (32);
5474 dht_handle = GNUNET_DHT_connect (c, 64);
5475 if (NULL == dht_handle)
5479 stats = GNUNET_STATISTICS_create ("mesh", c);
5481 /* Scheduled the task to clean up when shutdown is called */
5482 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
5484 pk = GNUNET_CRYPTO_ecc_key_create_from_file (keyfile);
5485 GNUNET_free (keyfile);
5486 GNUNET_assert (NULL != pk);
5487 my_private_key = pk;
5488 GNUNET_CRYPTO_ecc_key_get_public (my_private_key, &my_public_key);
5489 GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
5490 &my_full_id.hashPubKey);
5491 myid = GNUNET_PEER_intern (&my_full_id);
5492 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5493 "Mesh for peer [%s] starting\n",
5494 GNUNET_i2s(&my_full_id));
5496 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
5497 NULL, /* Closure passed to MESH functions */
5498 &core_init, /* Call core_init once connected */
5499 &core_connect, /* Handle connects */
5500 &core_disconnect, /* remove peers on disconnects */
5501 NULL, /* Don't notify about all incoming messages */
5502 GNUNET_NO, /* For header only in notification */
5503 NULL, /* Don't notify about all outbound messages */
5504 GNUNET_NO, /* For header-only out notification */
5505 core_handlers); /* Register these handlers */
5506 if (NULL == core_handle)
5509 GNUNET_SCHEDULER_shutdown ();
5513 next_local_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
5514 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
5515 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mesh service running\n");
5520 * The main function for the mesh service.
5522 * @param argc number of arguments from the command line
5523 * @param argv command line arguments
5524 * @return 0 ok, 1 on error
5527 main (int argc, char *const *argv)
5532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main()\n");
5533 r = GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
5535 ret = (GNUNET_OK == r) ? 0 : 1;
5536 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main() END\n");
5540 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5541 "Mesh for peer [%s] FWD ACKs %u, BCK ACKs %u\n",
5542 GNUNET_i2s(&my_full_id), debug_fwd_ack, debug_bck_ack);