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
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
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;
2161 if (NULL != t->owner && delta > 1)
2163 ack = t->prev_fc.last_pid_recv + delta;
2164 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK %u\n", ack);
2165 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2166 " last %u, qmax %u, q %u\n",
2167 t->prev_fc.last_pid_recv, t->queue_max, t->next_fc.queue_n);
2168 if (ack == t->prev_fc.last_ack_sent && GNUNET_NO == t->force_ack)
2170 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
2174 t->prev_fc.last_ack_sent = ack;
2175 if (NULL != t->owner)
2176 send_local_ack (t, t->owner, GNUNET_YES);
2177 else if (0 != t->prev_hop)
2178 send_ack (t, t->prev_hop, ack);
2182 t->force_ack = GNUNET_NO;
2187 * Send an ACK informing the children node/client about the available
2189 * If buffering is off, send only on behalf of root (can be self).
2190 * If buffering is on, send when sent to predecessor and buffer space is free.
2191 * Note that although the name is bck_ack, the BCK mean backwards *traffic*,
2192 * the ACK itself goes "forward" (towards children/clients).
2194 * @param t Tunnel on which to send the ACK.
2195 * @param type Type of message that triggered the ACK transmission.
2198 tunnel_send_bck_ack (struct MeshTunnel *t, uint16_t type)
2201 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2202 "Sending BCK ACK on tunnel %u [%u] due to %s\n",
2203 t->id.oid, t->id.tid, GNUNET_MESH_DEBUG_M2S(type));
2204 /* Is it after data to_origin retransmission? */
2207 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
2208 if (GNUNET_YES == t->nobuffer)
2210 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2211 " Not sending ACK, nobuffer + traffic\n");
2214 if (GNUNET_YES == t->reliable && NULL != t->owner)
2215 tunnel_send_bck_data_ack (t);
2217 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2218 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
2220 case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
2221 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2222 t->force_ack = GNUNET_YES;
2228 /* TODO: Check if we need to transmit the ACK (as in fwd) */
2230 ack = t->next_fc.last_pid_recv + t->queue_max - t->prev_fc.queue_n;
2232 if (t->next_fc.last_ack_sent == ack && GNUNET_NO == t->force_ack)
2234 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2235 " Not sending ACK, not needed, last ack sent was %u\n",
2236 t->next_fc.last_ack_sent);
2239 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2240 " Sending BCK ACK %u (last sent: %u)\n",
2241 ack, t->next_fc.last_ack_sent);
2242 t->next_fc.last_ack_sent = ack;
2244 if (NULL != t->client)
2245 send_local_ack (t, t->client, GNUNET_NO);
2246 else if (0 != t->next_hop)
2247 send_ack (t, t->next_hop, ack);
2250 t->force_ack = GNUNET_NO;
2255 * Modify the mesh message TID from global to local and send to client.
2257 * @param t Tunnel on which to send the message.
2258 * @param msg Message to modify and send.
2259 * @param c Client to send to.
2260 * @param tid Tunnel ID to use (c can be both owner and client).
2263 tunnel_send_client_data (struct MeshTunnel *t,
2264 const struct GNUNET_MESH_Data *msg,
2265 struct MeshClient *c, MESH_TunnelNumber tid)
2267 struct GNUNET_MESH_LocalData *copy;
2268 uint16_t size = ntohs (msg->header.size) - sizeof (struct GNUNET_MESH_Data);
2269 char cbuf[size + sizeof (struct GNUNET_MESH_LocalData)];
2271 if (size < sizeof (struct GNUNET_MessageHeader))
2273 GNUNET_break_op (0);
2281 copy = (struct GNUNET_MESH_LocalData *) cbuf;
2282 memcpy (©[1], &msg[1], size);
2283 copy->header.size = htons (sizeof (struct GNUNET_MESH_LocalData) + size);
2284 copy->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA);
2285 copy->tid = htonl (tid);
2286 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
2287 ©->header, GNUNET_NO);
2291 * Modify the unicast message TID from global to local and send to client.
2293 * @param t Tunnel on which to send the message.
2294 * @param msg Message to modify and send.
2297 tunnel_send_client_ucast (struct MeshTunnel *t,
2298 const struct GNUNET_MESH_Data *msg)
2300 tunnel_send_client_data (t, msg, t->client, t->local_tid_dest);
2305 * Modify the to_origin message TID from global to local and send to client.
2307 * @param t Tunnel on which to send the message.
2308 * @param msg Message to modify and send.
2311 tunnel_send_client_to_orig (struct MeshTunnel *t,
2312 const struct GNUNET_MESH_Data *msg)
2314 tunnel_send_client_data (t, msg, t->owner, t->local_tid);
2319 * We haven't received an ACK after a certain time: restransmit the message.
2321 * @param cls Closure (MeshReliableMessage with the message to restransmit)
2322 * @param tc TaskContext.
2325 tunnel_retransmit_message (void *cls,
2326 const struct GNUNET_SCHEDULER_TaskContext *tc)
2328 struct MeshTunnelReliability *rel = cls;
2329 struct MeshReliableMessage *copy;
2330 struct MeshFlowControl *fc;
2331 struct MeshPeerQueue *q;
2332 struct MeshPeerInfo *pi;
2333 struct MeshTunnel *t;
2334 struct GNUNET_MESH_Data *payload;
2337 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
2338 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2342 copy = rel->head_sent;
2349 /* Search the message to be retransmitted in the outgoing queue */
2350 payload = (struct GNUNET_MESH_Data *) ©[1];
2351 hop = rel == t->fwd_rel ? t->next_hop : t->prev_hop;
2352 fc = rel == t->fwd_rel ? &t->prev_fc : &t->next_fc;
2353 pi = peer_get_short (hop);
2354 for (q = pi->queue_head; NULL != q; q = q->next)
2356 if (ntohs (payload->header.type) == q->type)
2358 struct GNUNET_MESH_Data *queued_data = q->cls;
2360 if (queued_data->mid == payload->mid)
2365 /* Message not found in the queue */
2368 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RETRANSMIT %llu\n", copy->mid);
2369 copy->timestamp = GNUNET_TIME_absolute_get ();
2371 fc->last_ack_sent++;
2372 payload->pid = htonl (fc->last_pid_recv + 1);
2373 fc->last_pid_recv++;
2374 send_prebuilt_message (&payload->header, hop, t);
2375 GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO);
2379 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! STILL IN QUEUE %llu\n", copy->mid);
2382 rel->retry_timer = GNUNET_TIME_STD_BACKOFF (rel->retry_timer);
2383 rel->retry_task = GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
2384 &tunnel_retransmit_message,
2390 * @brief Re-initiate traffic to this peer if necessary.
2392 * Check if there is traffic queued towards this peer
2393 * and the core transmit handle is NULL (traffic was stalled).
2394 * If so, call core tmt rdy.
2396 * @param peer_id Short ID of peer to which initiate traffic.
2399 peer_unlock_queue(GNUNET_PEER_Id peer_id)
2401 struct MeshPeerInfo *peer;
2402 struct GNUNET_PeerIdentity id;
2403 struct MeshPeerQueue *q;
2406 peer = peer_get_short (peer_id);
2407 if (NULL != peer->core_transmit)
2410 q = queue_get_next (peer);
2413 /* Might br multicast traffic already sent to this particular peer but
2414 * not to other children in this tunnel.
2415 * This way t->queue_n would be > 0 but the queue of this particular peer
2421 GNUNET_PEER_resolve (peer->id, &id);
2422 peer->core_transmit =
2423 GNUNET_CORE_notify_transmit_ready(core_handle,
2426 GNUNET_TIME_UNIT_FOREVER_REL,
2436 * Send a message to all peers and clients in this tunnel that the tunnel
2437 * is no longer valid. If some peer or client should not receive the message,
2438 * should be zero'ed out before calling this function.
2440 * @param t The tunnel whose peers and clients to notify.
2443 tunnel_send_destroy (struct MeshTunnel *t)
2445 struct GNUNET_MESH_TunnelDestroy msg;
2446 struct GNUNET_PeerIdentity id;
2448 msg.header.size = htons (sizeof (msg));
2449 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);
2450 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2451 msg.tid = htonl (t->id.tid);
2452 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2453 " sending tunnel destroy for tunnel: %s [%X]\n",
2454 GNUNET_i2s (&msg.oid), t->id.tid);
2456 if (NULL == t->client && 0 != t->next_hop)
2458 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " child: %u\n", t->next_hop);
2459 GNUNET_PEER_resolve (t->next_hop, &id);
2460 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2461 " sending forward to %s\n",
2463 send_prebuilt_message (&msg.header, t->next_hop, t);
2465 if (NULL == t->owner && 0 != t->prev_hop)
2467 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " parent: %u\n", t->prev_hop);
2468 GNUNET_PEER_resolve (t->prev_hop, &id);
2469 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2470 " sending back to %s\n",
2472 send_prebuilt_message (&msg.header, t->prev_hop, t);
2474 if (NULL != t->owner)
2476 send_client_tunnel_destroy (t->owner, t);
2478 if (NULL != t->client)
2480 send_client_tunnel_destroy (t->client, t);
2486 * Cancel all transmissions towards a neighbor that belongs to a certain tunnel.
2488 * @param t Tunnel which to cancel.
2489 * @param neighbor Short ID of the neighbor to whom cancel the transmissions.
2492 peer_cancel_queues (GNUNET_PEER_Id neighbor, struct MeshTunnel *t)
2494 struct MeshPeerInfo *peer_info;
2495 struct MeshPeerQueue *pq;
2496 struct MeshPeerQueue *next;
2499 return; /* Was local peer, 0'ed in tunnel_destroy_iterator */
2500 peer_info = peer_get_short (neighbor);
2501 for (pq = peer_info->queue_head; NULL != pq; pq = next)
2504 if (pq->tunnel == t)
2506 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == pq->type ||
2507 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == pq->type)
2509 /* Should have been removed on destroy children */
2512 queue_destroy (pq, GNUNET_YES);
2515 if (NULL == peer_info->queue_head && NULL != peer_info->core_transmit)
2517 GNUNET_CORE_notify_transmit_ready_cancel(peer_info->core_transmit);
2518 peer_info->core_transmit = NULL;
2524 * Destroy the tunnel.
2526 * This function does not generate any warning traffic to clients or peers.
2529 * Remove the tunnel from peer_info's and clients' hashmaps.
2530 * Cancel messages belonging to this tunnel queued to neighbors.
2531 * Free any allocated resources linked to the tunnel.
2533 * @param t the tunnel to destroy
2535 * @return GNUNET_OK on success
2538 tunnel_destroy (struct MeshTunnel *t)
2540 struct MeshClient *c;
2541 struct GNUNET_HashCode hash;
2551 struct GNUNET_PeerIdentity id;
2553 GNUNET_PEER_resolve (t->id.oid, &id);
2554 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s [%x]\n",
2555 GNUNET_i2s (&id), t->id.tid);
2557 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
2561 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2562 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t))
2571 GNUNET_CONTAINER_multihashmap32_remove (c->own_tunnels, t->local_tid, t))
2578 if (NULL != t->client)
2582 GNUNET_CONTAINER_multihashmap32_remove (c->incoming_tunnels,
2583 t->local_tid_dest, t))
2589 GNUNET_CONTAINER_multihashmap32_remove (incoming_tunnels,
2590 t->local_tid_dest, t))
2597 if (0 != t->prev_hop)
2599 peer_cancel_queues (t->prev_hop, t);
2600 GNUNET_PEER_change_rc (t->prev_hop, -1);
2602 if (0 != t->next_hop)
2604 peer_cancel_queues (t->next_hop, t);
2605 GNUNET_PEER_change_rc (t->next_hop, -1);
2608 peer_info_remove_tunnel (peer_get_short (t->dest), t);
2611 if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
2612 GNUNET_SCHEDULER_cancel (t->maintenance_task);
2615 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
2616 path_destroy (t->path);
2622 * Tunnel is empty: destroy it.
2624 * Notifies all participants (peers, cleints) about the destruction.
2626 * @param t Tunnel to destroy.
2629 tunnel_destroy_empty (struct MeshTunnel *t)
2633 struct GNUNET_PeerIdentity id;
2635 GNUNET_PEER_resolve (t->id.oid, &id);
2636 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2637 "executing destruction of empty tunnel %s [%X]\n",
2638 GNUNET_i2s (&id), t->id.tid);
2642 if (GNUNET_NO == t->destroy)
2643 tunnel_send_destroy (t);
2644 if (0 == t->pending_messages)
2647 t->destroy = GNUNET_YES;
2651 * Initialize a Flow Control structure to the initial state.
2653 * @param fc Flow Control structure to initialize.
2656 fc_init (struct MeshFlowControl *fc)
2658 fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
2659 fc->last_pid_recv = (uint32_t) -1;
2660 fc->last_ack_sent = (uint32_t) -1; /* No traffic allowed yet */
2661 fc->last_ack_recv = (uint32_t) -1;
2662 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2663 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
2668 * Create a new tunnel
2670 * @param owner Who is the owner of the tunnel (short ID).
2671 * @param tid Tunnel Number of the tunnel.
2672 * @param client Clients that owns the tunnel, NULL for foreign tunnels.
2673 * @param local Tunnel Number for the tunnel, for the client point of view.
2675 * @return A new initialized tunnel. NULL on error.
2677 static struct MeshTunnel *
2678 tunnel_new (GNUNET_PEER_Id owner,
2679 MESH_TunnelNumber tid,
2680 struct MeshClient *client,
2681 MESH_TunnelNumber local)
2683 struct MeshTunnel *t;
2684 struct GNUNET_HashCode hash;
2686 if (n_tunnels >= max_tunnels && NULL == client)
2689 t = GNUNET_malloc (sizeof (struct MeshTunnel));
2692 t->queue_max = (max_msgs_queue / max_tunnels) + 1;
2694 fc_init (&t->next_fc);
2695 fc_init (&t->prev_fc);
2696 t->local_tid = local;
2698 GNUNET_STATISTICS_update (stats, "# tunnels", 1, GNUNET_NO);
2700 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2702 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
2703 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2710 GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR);
2718 GNUNET_CONTAINER_multihashmap32_put (client->own_tunnels,
2720 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2724 GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR);
2734 * Set options in a tunnel, extracted from a bit flag field
2736 * @param t Tunnel to set options to.
2737 * @param options Bit array in host byte order.
2740 tunnel_set_options (struct MeshTunnel *t, uint32_t options)
2742 t->nobuffer = (options & GNUNET_MESH_OPTION_NOBUFFER) != 0 ?
2743 GNUNET_YES : GNUNET_NO;
2744 t->reliable = (options & GNUNET_MESH_OPTION_RELIABLE) != 0 ?
2745 GNUNET_YES : GNUNET_NO;
2750 * Iterator for deleting each tunnel whose client endpoint disconnected.
2752 * @param cls Closure (client that has disconnected).
2753 * @param key The local tunnel id (used to access the hashmap).
2754 * @param value The value stored at the key (tunnel to destroy).
2756 * @return GNUNET_OK, keep iterating.
2759 tunnel_destroy_iterator (void *cls,
2763 struct MeshTunnel *t = value;
2764 struct MeshClient *c = cls;
2766 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2767 " Tunnel %X / %X destroy, due to client %u shutdown.\n",
2768 t->local_tid, t->local_tid_dest, c->id);
2769 client_delete_tunnel (c, t);
2772 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is destination.\n", c->id);
2774 if (0 != t->next_hop) { /* destroy could come before a path is used */
2775 GNUNET_PEER_change_rc (t->next_hop, -1);
2781 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is owner.\n", c->id);
2783 if (0 != t->prev_hop) { /* destroy could come before a path is used */
2784 GNUNET_PEER_change_rc (t->prev_hop, -1);
2789 tunnel_destroy_empty (t);
2796 * Timeout function, destroys tunnel if called
2798 * @param cls Closure (tunnel to destroy).
2799 * @param tc TaskContext
2802 tunnel_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2804 struct MeshTunnel *t = cls;
2805 struct GNUNET_PeerIdentity id;
2807 t->maintenance_task = GNUNET_SCHEDULER_NO_TASK;
2808 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2810 GNUNET_PEER_resolve(t->id.oid, &id);
2811 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2812 "Tunnel %s [%X] timed out. Destroying.\n",
2813 GNUNET_i2s(&id), t->id.tid);
2814 if (NULL != t->client)
2815 send_client_tunnel_destroy (t->client, t);
2816 tunnel_destroy (t); /* Do not notify other */
2821 * Resets the tunnel timeout. Starts it if no timeout was running.
2823 * @param t Tunnel whose timeout to reset.
2825 * TODO use heap to improve efficiency of scheduler.
2828 tunnel_reset_timeout (struct MeshTunnel *t)
2830 if (NULL != t->owner || 0 != t->local_tid || 0 == t->prev_hop)
2832 if (GNUNET_SCHEDULER_NO_TASK != t->maintenance_task)
2833 GNUNET_SCHEDULER_cancel (t->maintenance_task);
2834 t->maintenance_task =
2835 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
2836 (refresh_path_time, 4), &tunnel_timeout, t);
2840 /******************************************************************************/
2841 /**************** MESH NETWORK HANDLER HELPERS ***********************/
2842 /******************************************************************************/
2845 * Function to send a create path packet to a peer.
2847 * @param cls closure
2848 * @param size number of bytes available in buf
2849 * @param buf where the callee should write the message
2850 * @return number of bytes written to buf
2853 send_core_path_create (void *cls, size_t size, void *buf)
2855 struct MeshTunnel *t = cls;
2856 struct GNUNET_MESH_CreateTunnel *msg;
2857 struct GNUNET_PeerIdentity *peer_ptr;
2858 struct MeshPeerPath *p = t->path;
2863 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATE PATH sending...\n");
2865 sizeof (struct GNUNET_MESH_CreateTunnel) +
2866 p->length * sizeof (struct GNUNET_PeerIdentity);
2868 if (size < size_needed || NULL == buf)
2873 msg = (struct GNUNET_MESH_CreateTunnel *) buf;
2874 msg->header.size = htons (size_needed);
2875 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE);
2876 msg->tid = ntohl (t->id.tid);
2879 if (GNUNET_YES == t->nobuffer)
2880 opt |= GNUNET_MESH_OPTION_NOBUFFER;
2881 if (GNUNET_YES == t->reliable)
2882 opt |= GNUNET_MESH_OPTION_RELIABLE;
2883 msg->opt = htonl (opt);
2884 msg->port = htonl (t->port);
2886 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
2887 for (i = 0; i < p->length; i++)
2889 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
2892 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2893 "CREATE PATH (%u bytes long) sent!\n", size_needed);
2899 * Creates a path ack message in buf and frees all unused resources.
2901 * @param cls closure (MeshTransmissionDescriptor)
2902 * @param size number of bytes available in buf
2903 * @param buf where the callee should write the message
2904 * @return number of bytes written to buf
2907 send_core_path_ack (void *cls, size_t size, void *buf)
2909 struct MeshTunnel *t = cls;
2910 struct GNUNET_MESH_PathACK *msg = buf;
2912 GNUNET_assert (NULL != t);
2913 if (sizeof (struct GNUNET_MESH_PathACK) > size)
2918 t->prev_fc.last_ack_sent = t->nobuffer ? 0 : t->queue_max - 1;
2919 msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK));
2920 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
2921 GNUNET_PEER_resolve (t->id.oid, &msg->oid);
2922 msg->tid = htonl (t->id.tid);
2923 msg->peer_id = my_full_id;
2924 msg->ack = htonl (t->prev_fc.last_ack_sent);
2926 /* TODO add signature */
2928 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "PATH ACK sent!\n");
2929 return sizeof (struct GNUNET_MESH_PathACK);
2934 * Free a transmission that was already queued with all resources
2935 * associated to the request.
2937 * @param queue Queue handler to cancel.
2938 * @param clear_cls Is it necessary to free associated cls?
2941 queue_destroy (struct MeshPeerQueue *queue, int clear_cls)
2943 struct MeshFlowControl *fc;
2945 if (GNUNET_YES == clear_cls)
2947 switch (queue->type)
2949 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
2950 GNUNET_log (GNUNET_ERROR_TYPE_INFO, " cancelling TUNNEL_DESTROY\n");
2951 GNUNET_break (GNUNET_YES == queue->tunnel->destroy);
2953 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
2954 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
2955 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2956 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2957 case GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE:
2958 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2959 " prebuilt message\n");
2960 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2962 GNUNET_MESH_DEBUG_M2S (queue->type));
2964 case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
2965 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type create path\n");
2969 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2970 " type %s unknown!\n",
2971 GNUNET_MESH_DEBUG_M2S (queue->type));
2973 GNUNET_free_non_null (queue->cls);
2975 GNUNET_CONTAINER_DLL_remove (queue->peer->queue_head,
2976 queue->peer->queue_tail,
2979 /* Delete from appropriate fc in the tunnel */
2980 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == queue->type ||
2981 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == queue->type )
2983 if (queue->peer->id == queue->tunnel->prev_hop)
2984 fc = &queue->tunnel->prev_fc;
2985 else if (queue->peer->id == queue->tunnel->next_hop)
2986 fc = &queue->tunnel->next_fc;
2990 GNUNET_free (queue);
2995 GNUNET_free (queue);
3000 * @brief Get the next transmittable message from the queue.
3002 * This will be the head, except in the case of being a data packet
3003 * not allowed by the destination peer.
3005 * @param peer Destination peer.
3007 * @return The next viable MeshPeerQueue element to send to that peer.
3008 * NULL when there are no transmittable messages.
3010 struct MeshPeerQueue *
3011 queue_get_next (const struct MeshPeerInfo *peer)
3013 struct MeshPeerQueue *q;
3015 struct GNUNET_MESH_Data *dmsg;
3016 struct MeshTunnel* t;
3020 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* selecting message\n");
3021 for (q = peer->queue_head; NULL != q; q = q->next)
3024 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3026 GNUNET_MESH_DEBUG_M2S (q->type));
3027 dmsg = (struct GNUNET_MESH_Data *) q->cls;
3028 pid = ntohl (dmsg->pid);
3031 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3032 ack = t->next_fc.last_ack_recv;
3034 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3035 ack = t->prev_fc.last_ack_recv;
3038 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3042 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3043 "* ACK: %u, PID: %u, MID: %llu\n",
3044 ack, pid, GNUNET_ntohll (dmsg->mid));
3045 if (GNUNET_NO == GMC_is_pid_bigger (pid, ack))
3047 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3053 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3057 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3058 "* nothing found\n");
3064 queue_send (void *cls, size_t size, void *buf)
3066 struct MeshPeerInfo *peer = cls;
3067 struct GNUNET_MessageHeader *msg;
3068 struct MeshPeerQueue *queue;
3069 struct MeshTunnel *t;
3070 struct GNUNET_PeerIdentity dst_id;
3071 struct MeshFlowControl *fc;
3076 peer->core_transmit = NULL;
3078 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Queue send\n");
3079 queue = queue_get_next (peer);
3081 /* Queue has no internal mesh traffic nor sendable payload */
3084 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not ready, return\n");
3085 if (NULL == peer->queue_head)
3086 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
3089 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not empty\n");
3091 GNUNET_PEER_resolve (peer->id, &dst_id);
3092 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3094 GNUNET_i2s (&dst_id));
3095 /* Check if buffer size is enough for the message */
3096 if (queue->size > size)
3098 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3099 "* not enough room, reissue\n");
3100 peer->core_transmit =
3101 GNUNET_CORE_notify_transmit_ready (core_handle,
3104 GNUNET_TIME_UNIT_FOREVER_REL,
3111 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* size ok\n");
3114 GNUNET_assert (0 < t->pending_messages);
3115 t->pending_messages--;
3119 switch (queue->type)
3122 case GNUNET_MESSAGE_TYPE_MESH_ACK:
3123 case GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK:
3124 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK:
3125 case GNUNET_MESSAGE_TYPE_MESH_POLL:
3126 case GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN:
3127 case GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY:
3128 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
3129 case GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE:
3130 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3132 GNUNET_MESH_DEBUG_M2S (queue->type));
3134 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3135 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3136 data_size = send_core_data_raw (queue->cls, size, buf);
3137 msg = (struct GNUNET_MessageHeader *) buf;
3138 type = ntohs (msg->type);
3140 case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
3141 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path create\n");
3142 data_size = send_core_path_create (queue->cls, size, buf);
3144 case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
3145 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n");
3146 data_size = send_core_path_ack (queue->cls, size, buf);
3150 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3151 "* type unknown: %u\n",
3156 if (0 < drop_percent &&
3157 GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
3159 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3160 "Dropping message of type %s\n",
3161 GNUNET_MESH_DEBUG_M2S(queue->type));
3164 /* Free queue, but cls was freed by send_core_* */
3165 queue_destroy (queue, GNUNET_NO);
3167 /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
3168 pid = ((struct GNUNET_MESH_Data *) buf)->pid;
3172 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3173 t->next_fc.last_pid_sent = pid;
3174 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST);
3176 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3177 t->prev_fc.last_pid_sent = pid;
3178 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
3184 if (GNUNET_YES == t->destroy && 0 == t->pending_messages)
3186 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying tunnel!\n");
3190 /* If more data in queue, send next */
3191 queue = queue_get_next (peer);
3194 struct GNUNET_PeerIdentity id;
3196 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* more data!\n");
3197 GNUNET_PEER_resolve (peer->id, &id);
3198 peer->core_transmit =
3199 GNUNET_CORE_notify_transmit_ready(core_handle,
3202 GNUNET_TIME_UNIT_FOREVER_REL,
3208 else if (NULL != peer->queue_head)
3210 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3212 GNUNET_i2s (&my_full_id));
3213 if (peer->id == t->next_hop)
3215 else if (peer->id == t->prev_hop)
3222 if (NULL != fc && GNUNET_SCHEDULER_NO_TASK == fc->poll_task)
3225 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
3229 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Return %d\n", data_size);
3235 * @brief Queue and pass message to core when possible.
3237 * If type is payload (UNICAST, TO_ORIGIN) checks for queue status and
3238 * accounts for it. In case the queue is full, the message is dropped and
3241 * Otherwise, message is treated as internal and allowed to go regardless of
3244 * @param cls Closure (@c type dependant). It will be used by queue_send to
3245 * build the message to be sent if not already prebuilt.
3246 * @param type Type of the message, 0 for a raw message.
3247 * @param size Size of the message.
3248 * @param dst Neighbor to send message to.
3249 * @param t Tunnel this message belongs to.
3252 queue_add (void *cls, uint16_t type, size_t size,
3253 struct MeshPeerInfo *dst, struct MeshTunnel *t)
3255 struct MeshPeerQueue *queue;
3256 struct GNUNET_PeerIdentity id;
3257 struct MeshFlowControl *fc;
3261 priority = GNUNET_NO;
3262 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type)
3266 else if (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type)
3272 if (fc->queue_n >= t->queue_max)
3274 /* If this isn't a retransmission, drop the message */
3275 if (GNUNET_NO == t->reliable ||
3276 (NULL == t->owner && GNUNET_MESSAGE_TYPE_MESH_UNICAST == type) ||
3277 (NULL == t->client && GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type))
3279 GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)",
3282 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3283 "queue full: %u/%u\n",
3284 fc->queue_n, t->queue_max);
3285 return; /* Drop this message */
3287 priority = GNUNET_YES;
3291 queue = GNUNET_malloc (sizeof (struct MeshPeerQueue));
3297 if (GNUNET_YES == priority)
3299 struct GNUNET_MESH_Data *d;
3303 GNUNET_CONTAINER_DLL_insert (dst->queue_head, dst->queue_tail, queue);
3304 d = (struct GNUNET_MESH_Data *) queue->cls;
3306 for (queue = dst->queue_tail; NULL != queue; queue = queue->prev)
3308 d = (struct GNUNET_MESH_Data *) queue->cls;
3315 GNUNET_CONTAINER_DLL_insert_tail (dst->queue_head, dst->queue_tail, queue);
3316 if (NULL == dst->core_transmit)
3318 GNUNET_PEER_resolve (dst->id, &id);
3319 dst->core_transmit =
3320 GNUNET_CORE_notify_transmit_ready (core_handle,
3323 GNUNET_TIME_UNIT_FOREVER_REL,
3329 t->pending_messages++;
3333 /******************************************************************************/
3334 /******************** MESH NETWORK HANDLERS **************************/
3335 /******************************************************************************/
3339 * Core handler for path creation
3341 * @param cls closure
3342 * @param message message
3343 * @param peer peer identity this notification is about
3345 * @return GNUNET_OK to keep the connection open,
3346 * GNUNET_SYSERR to close it (signal serious error)
3349 handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer,
3350 const struct GNUNET_MessageHeader *message)
3352 unsigned int own_pos;
3355 MESH_TunnelNumber tid;
3356 struct GNUNET_MESH_CreateTunnel *msg;
3357 struct GNUNET_PeerIdentity *pi;
3358 struct MeshPeerPath *path;
3359 struct MeshPeerInfo *dest_peer_info;
3360 struct MeshPeerInfo *orig_peer_info;
3361 struct MeshTunnel *t;
3363 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3364 "Received a path create msg [%s]\n",
3365 GNUNET_i2s (&my_full_id));
3366 size = ntohs (message->size);
3367 if (size < sizeof (struct GNUNET_MESH_CreateTunnel))
3369 GNUNET_break_op (0);
3373 size -= sizeof (struct GNUNET_MESH_CreateTunnel);
3374 if (size % sizeof (struct GNUNET_PeerIdentity))
3376 GNUNET_break_op (0);
3379 size /= sizeof (struct GNUNET_PeerIdentity);
3382 GNUNET_break_op (0);
3385 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
3386 msg = (struct GNUNET_MESH_CreateTunnel *) message;
3388 tid = ntohl (msg->tid);
3389 pi = (struct GNUNET_PeerIdentity *) &msg[1];
3390 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3391 " path is for tunnel %s[%X].\n", GNUNET_i2s (pi), tid);
3392 t = tunnel_get (pi, tid);
3393 if (NULL == t) /* might be a local tunnel */
3397 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating tunnel\n");
3398 t = tunnel_new (GNUNET_PEER_intern (pi), tid, NULL, 0);
3404 t->port = ntohl (msg->port);
3405 opt = ntohl (msg->opt);
3406 if (0 != (opt & GNUNET_MESH_OPTION_NOBUFFER))
3408 t->nobuffer = GNUNET_YES;
3411 if (0 != (opt & GNUNET_MESH_OPTION_RELIABLE))
3413 t->reliable = GNUNET_YES;
3415 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " nobuffer:%d\n", t->nobuffer);
3417 tunnel_reset_timeout (t);
3419 t->state = MESH_TUNNEL_WAITING;
3421 GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey);
3422 if (NULL == dest_peer_info)
3424 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3425 " Creating PeerInfo for destination.\n");
3426 dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
3427 dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]);
3428 GNUNET_CONTAINER_multihashmap_put (peers, &pi[size - 1].hashPubKey,
3430 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
3432 orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey);
3433 if (NULL == orig_peer_info)
3435 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3436 " Creating PeerInfo for origin.\n");
3437 orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
3438 orig_peer_info->id = GNUNET_PEER_intern (pi);
3439 GNUNET_CONTAINER_multihashmap_put (peers, &pi->hashPubKey, orig_peer_info,
3440 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
3442 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
3443 path = path_new (size);
3445 for (i = 0; i < size; i++)
3447 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n",
3448 GNUNET_i2s (&pi[i]));
3449 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
3450 if (path->peers[i] == myid)
3453 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
3454 if (own_pos == 0 && path->peers[own_pos] != myid)
3456 /* create path: self not found in path through self */
3457 GNUNET_break_op (0);
3458 path_destroy (path);
3462 path_add_to_peers (path, GNUNET_NO);
3463 tunnel_use_path (t, path);
3465 peer_info_add_tunnel (dest_peer_info, t);
3467 if (own_pos == size - 1)
3469 struct MeshClient *c;
3471 /* Find target client */
3472 c = GNUNET_CONTAINER_multihashmap32_get (ports, t->port);
3475 /* TODO send reject */
3479 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
3480 peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_YES);
3482 /* Assign local tid */
3483 while (NULL != tunnel_get_incoming (next_local_tid))
3484 next_local_tid = (next_local_tid + 1) | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
3485 t->local_tid_dest = next_local_tid++;
3486 next_local_tid = next_local_tid | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
3488 if (GNUNET_YES == t->reliable)
3490 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
3491 t->bck_rel = GNUNET_malloc (sizeof (struct MeshTunnelReliability));
3493 t->bck_rel->expected_delay = MESH_RETRANSMIT_TIME;
3496 tunnel_add_client (t, c);
3497 send_client_tunnel_create (t);
3502 struct MeshPeerPath *path2;
3504 t->next_hop = path->peers[own_pos + 1];
3505 GNUNET_PEER_change_rc(t->next_hop, 1);
3507 /* It's for somebody else! Retransmit. */
3508 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
3509 path2 = path_duplicate (path);
3510 peer_info_add_path (dest_peer_info, path2, GNUNET_NO);
3511 peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_NO);
3512 send_create_path (t);
3520 * Core handler for path ACKs
3522 * @param cls closure
3523 * @param message message
3524 * @param peer peer identity this notification is about
3526 * @return GNUNET_OK to keep the connection open,
3527 * GNUNET_SYSERR to close it (signal serious error)
3530 handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
3531 const struct GNUNET_MessageHeader *message)
3533 struct GNUNET_MESH_PathACK *msg;
3534 struct MeshPeerInfo *peer_info;
3535 struct MeshPeerPath *p;
3536 struct MeshTunnel *t;
3538 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a path ACK msg [%s]\n",
3539 GNUNET_i2s (&my_full_id));
3540 msg = (struct GNUNET_MESH_PathACK *) message;
3541 t = tunnel_get (&msg->oid, ntohl(msg->tid));
3544 /* TODO notify that we don't know the tunnel */
3545 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel", 1, GNUNET_NO);
3546 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't know the tunnel %s [%X]!\n",
3547 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3550 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %s [%X]\n",
3551 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3553 peer_info = peer_get (&msg->peer_id);
3554 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by peer %s\n",
3555 GNUNET_i2s (&msg->peer_id));
3556 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n",
3559 /* Add path to peers? */
3563 path_add_to_peers (p, GNUNET_YES);
3569 t->state = MESH_TUNNEL_READY;
3570 t->next_fc.last_ack_recv = (NULL == t->client) ? ntohl (msg->ack) : 0;
3571 t->prev_fc.last_ack_sent = ntohl (msg->ack);
3573 /* Message for us? */
3574 if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity)))
3576 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
3577 if (NULL == t->owner)
3579 GNUNET_break_op (0);
3582 if (NULL != peer_info->dhtget)
3584 GNUNET_DHT_get_stop (peer_info->dhtget);
3585 peer_info->dhtget = NULL;
3587 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
3588 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
3592 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3593 " not for us, retransmitting...\n");
3594 peer_info = peer_get (&msg->oid);
3595 send_prebuilt_message (message, t->prev_hop, t);
3601 * Core handler for notifications of broken paths
3603 * @param cls closure
3604 * @param message message
3605 * @param peer peer identity this notification is about
3607 * @return GNUNET_OK to keep the connection open,
3608 * GNUNET_SYSERR to close it (signal serious error)
3611 handle_mesh_path_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
3612 const struct GNUNET_MessageHeader *message)
3614 struct GNUNET_MESH_PathBroken *msg;
3615 struct MeshTunnel *t;
3617 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3618 "Received a PATH BROKEN msg from %s\n", GNUNET_i2s (peer));
3619 msg = (struct GNUNET_MESH_PathBroken *) message;
3620 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
3621 GNUNET_i2s (&msg->peer1));
3622 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
3623 GNUNET_i2s (&msg->peer2));
3624 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3627 GNUNET_break_op (0);
3630 tunnel_notify_connection_broken (t, GNUNET_PEER_search (&msg->peer1),
3631 GNUNET_PEER_search (&msg->peer2));
3638 * Core handler for tunnel destruction
3640 * @param cls closure
3641 * @param message message
3642 * @param peer peer identity this notification is about
3644 * @return GNUNET_OK to keep the connection open,
3645 * GNUNET_SYSERR to close it (signal serious error)
3648 handle_mesh_tunnel_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
3649 const struct GNUNET_MessageHeader *message)
3651 struct GNUNET_MESH_TunnelDestroy *msg;
3652 struct MeshTunnel *t;
3654 msg = (struct GNUNET_MESH_TunnelDestroy *) message;
3655 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3656 "Got a TUNNEL DESTROY packet from %s\n",
3658 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3659 " for tunnel %s [%u]\n",
3660 GNUNET_i2s (&msg->oid), ntohl (msg->tid));
3661 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3664 /* Probably already got the message from another path,
3665 * destroyed the tunnel and retransmitted to children.
3668 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel",
3672 if (t->local_tid_dest >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
3674 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "INCOMING TUNNEL %X %X\n",
3675 t->local_tid, t->local_tid_dest);
3677 if (GNUNET_PEER_search (peer) == t->prev_hop)
3679 // TODO check owner's signature
3680 // TODO add owner's signatue to tunnel for retransmission
3681 peer_cancel_queues (t->prev_hop, t);
3682 GNUNET_PEER_change_rc (t->prev_hop, -1);
3685 else if (GNUNET_PEER_search (peer) == t->next_hop)
3687 // TODO check dest's signature
3688 // TODO add dest's signatue to tunnel for retransmission
3689 peer_cancel_queues (t->next_hop, t);
3690 GNUNET_PEER_change_rc (t->next_hop, -1);
3695 GNUNET_break_op (0);
3696 // TODO check both owner AND destination's signature to see which matches
3697 // TODO restransmit in appropriate direction
3700 tunnel_destroy_empty (t);
3702 // TODO: add timeout to destroy the tunnel anyway
3708 * Core handler for mesh network traffic going from the origin to a peer
3710 * @param cls closure
3711 * @param peer peer identity this notification is about
3712 * @param message message
3713 * @return GNUNET_OK to keep the connection open,
3714 * GNUNET_SYSERR to close it (signal serious error)
3717 handle_mesh_unicast (void *cls, const struct GNUNET_PeerIdentity *peer,
3718 const struct GNUNET_MessageHeader *message)
3720 struct GNUNET_MESH_Data *msg;
3721 struct MeshTunnel *t;
3726 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a unicast packet from %s\n",
3729 size = ntohs (message->size);
3731 sizeof (struct GNUNET_MESH_Data) +
3732 sizeof (struct GNUNET_MessageHeader))
3737 msg = (struct GNUNET_MESH_Data *) message;
3738 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " of type %s\n",
3739 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
3741 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3744 /* TODO notify back: we don't know this tunnel */
3745 GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO);
3746 GNUNET_break_op (0);
3749 pid = ntohl (msg->pid);
3750 if (GMC_is_pid_bigger (pid, t->prev_fc.last_ack_sent))
3752 GNUNET_STATISTICS_update (stats, "# unsolicited unicast", 1, GNUNET_NO);
3753 GNUNET_break_op (0);
3754 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3755 "Received PID %u, (prev %u), ACK %u\n",
3756 pid, t->prev_fc.last_pid_recv, t->prev_fc.last_ack_sent);
3757 tunnel_send_fwd_ack(t, GNUNET_MESSAGE_TYPE_MESH_POLL);
3761 tunnel_reset_timeout (t);
3762 if (t->dest == myid)
3764 /* TODO signature verification */
3765 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3766 " it's for us! sending to clients...\n");
3767 GNUNET_STATISTICS_update (stats, "# unicast received", 1, GNUNET_NO);
3768 // if (GMC_is_pid_bigger(pid, t->prev_fc.last_pid_recv)) FIXME use
3769 if (GMC_is_pid_bigger (pid, t->prev_fc.last_pid_recv))
3771 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3772 " pid %u not seen yet\n", pid);
3773 t->prev_fc.last_pid_recv = pid;
3775 if (GNUNET_NO == t->reliable ||
3776 GNUNET_ntohll (msg->mid) == t->bck_rel->mid_recv)
3778 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3779 "!!! RECV %llu\n", GNUNET_ntohll(msg->mid));
3780 if (GNUNET_YES == t->reliable)
3781 t->bck_rel->mid_recv++;
3782 tunnel_send_client_ucast (t, msg);
3787 // GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO);
3788 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3789 " Pid %u not expected (%u), dropping!\n",
3790 pid, t->prev_fc.last_pid_recv + 1);
3792 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST);
3795 t->prev_fc.last_pid_recv = pid;
3796 if (0 == t->next_hop)
3801 ttl = ntohl (msg->ttl);
3802 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
3805 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
3806 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
3807 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
3810 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3811 " not for us, retransmitting...\n");
3813 send_prebuilt_message (message, t->next_hop, t);
3814 GNUNET_STATISTICS_update (stats, "# unicast forwarded", 1, GNUNET_NO);
3820 * Core handler for mesh network traffic toward the owner of a tunnel
3822 * @param cls closure
3823 * @param message message
3824 * @param peer peer identity this notification is about
3826 * @return GNUNET_OK to keep the connection open,
3827 * GNUNET_SYSERR to close it (signal serious error)
3830 handle_mesh_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
3831 const struct GNUNET_MessageHeader *message)
3833 struct GNUNET_MESH_Data *msg;
3834 struct MeshTunnel *t;
3839 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a ToOrigin packet from %s\n",
3841 size = ntohs (message->size);
3842 if (size < sizeof (struct GNUNET_MESH_Data) + /* Payload must be */
3843 sizeof (struct GNUNET_MessageHeader)) /* at least a header */
3845 GNUNET_break_op (0);
3848 msg = (struct GNUNET_MESH_Data *) message;
3849 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " of type %s\n",
3850 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
3851 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3852 pid = ntohl (msg->pid);
3855 /* TODO notify that we dont know this tunnel (whom)? */
3856 GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO);
3857 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3858 "Received to_origin with PID %u on unknown tunnel %s [%u]\n",
3859 pid, GNUNET_i2s (&msg->oid), ntohl (msg->tid));
3863 if (GMC_is_pid_bigger (pid, t->next_fc.last_ack_sent))
3865 GNUNET_STATISTICS_update (stats, "# unsolicited to_orig", 1, GNUNET_NO);
3866 GNUNET_break_op (0);
3867 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3868 "Received PID %u, ACK %u\n",
3869 pid, t->next_fc.last_ack_sent);
3870 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
3874 if (myid == t->id.oid)
3876 /* TODO signature verification */
3877 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3878 " it's for us! sending to clients...\n");
3879 GNUNET_STATISTICS_update (stats, "# to origin received", 1, GNUNET_NO);
3880 if ( (GNUNET_NO == t->reliable &&
3881 GMC_is_pid_bigger(pid, t->next_fc.last_pid_recv))
3883 (GNUNET_YES == t->reliable &&
3884 pid == t->next_fc.last_pid_recv + 1) ) // FIXME use "futures" as accepting
3886 t->next_fc.last_pid_recv = pid;
3887 tunnel_send_client_to_orig (t, msg);
3891 // GNUNET_STATISTICS_update (stats, "# duplicate PID drops BCK", 1, GNUNET_NO);
3892 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3893 " Pid %u not expected, sending FWD ACK!\n", pid);
3895 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
3898 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3899 " not for us, retransmitting...\n");
3900 t->next_fc.last_pid_recv = pid;
3901 if (0 == t->prev_hop) /* No owner AND no prev hop */
3903 if (GNUNET_YES == t->destroy)
3905 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3906 "to orig received on a dying tunnel %s [%X]\n",
3907 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3910 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3911 "unknown to origin at %s\n",
3912 GNUNET_i2s (&my_full_id));
3913 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3916 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3917 "on tunnel %s [%X]\n",
3918 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
3921 ttl = ntohl (msg->ttl);
3922 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
3925 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
3926 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
3927 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
3930 send_prebuilt_message (message, t->prev_hop, t);
3931 GNUNET_STATISTICS_update (stats, "# to origin forwarded", 1, GNUNET_NO);
3938 * Core handler for mesh network traffic end-to-end ACKs.
3940 * @param cls Closure.
3941 * @param message Message.
3942 * @param peer Peer identity this notification is about.
3944 * @return GNUNET_OK to keep the connection open,
3945 * GNUNET_SYSERR to close it (signal serious error)
3948 handle_mesh_data_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
3949 const struct GNUNET_MessageHeader *message)
3951 struct GNUNET_MESH_DataACK *msg;
3952 struct MeshTunnelReliability *rel;
3953 struct MeshReliableMessage *copy;
3954 struct MeshReliableMessage *next;
3955 struct MeshTunnel *t;
3961 type = ntohs (message->type);
3962 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a %s message from %s!\n",
3963 GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer));
3964 msg = (struct GNUNET_MESH_DataACK *) message;
3966 t = tunnel_get (&msg->oid, ntohl (msg->tid));
3969 /* TODO notify that we dont know this tunnel (whom)? */
3970 GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO);
3973 ack = GNUNET_ntohll (msg->mid);
3974 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %llu\n", ack);
3976 /* Is this a forward or backward ACK? */
3977 id = GNUNET_PEER_search (peer);
3978 if (t->next_hop == id && GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK == type)
3980 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
3981 if (NULL == t->owner)
3983 send_prebuilt_message (message, t->prev_hop, t);
3987 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST);
3989 else if (t->prev_hop == id && GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK == type)
3991 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
3992 if (NULL == t->client)
3994 send_prebuilt_message (message, t->next_hop, t);
3998 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
4002 GNUNET_break_op (0);
4006 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! ACK %llu\n", ack);
4007 for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next)
4009 struct GNUNET_TIME_Relative time;
4011 if (copy->mid > ack)
4013 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! head %llu, out!\n", copy->mid);
4017 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! id %llu\n", copy->mid);
4019 time = GNUNET_TIME_absolute_get_duration (copy->timestamp);
4020 rel->expected_delay.rel_value += time.rel_value;
4021 rel->expected_delay.rel_value /= 2;
4023 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! new expected delay %s\n",
4024 GNUNET_STRINGS_relative_time_to_string (rel->expected_delay,
4026 rel->retry_timer = rel->expected_delay;
4027 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
4031 if (GNUNET_YES == work)
4033 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
4035 GNUNET_SCHEDULER_cancel (rel->retry_task);
4036 if (NULL == rel->head_sent)
4038 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
4042 struct GNUNET_TIME_Absolute new_target;
4043 struct GNUNET_TIME_Relative delay;
4045 new_target = GNUNET_TIME_absolute_add (rel->head_sent->timestamp,
4047 delay = GNUNET_TIME_absolute_get_remaining (new_target);
4049 GNUNET_SCHEDULER_add_delayed (delay,
4050 &tunnel_retransmit_message,
4061 * Core handler for mesh network traffic point-to-point acks.
4063 * @param cls closure
4064 * @param message message
4065 * @param peer peer identity this notification is about
4067 * @return GNUNET_OK to keep the connection open,
4068 * GNUNET_SYSERR to close it (signal serious error)
4071 handle_mesh_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
4072 const struct GNUNET_MessageHeader *message)
4074 struct GNUNET_MESH_ACK *msg;
4075 struct MeshTunnel *t;
4076 struct MeshFlowControl *fc;
4080 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
4082 msg = (struct GNUNET_MESH_ACK *) message;
4084 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4088 /* TODO notify that we dont know this tunnel (whom)? */
4089 GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO);
4092 ack = ntohl (msg->pid);
4093 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
4095 /* Is this a forward or backward ACK? */
4096 id = GNUNET_PEER_search (peer);
4097 if (t->next_hop == id)
4100 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
4103 else if (t->prev_hop == id)
4106 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
4111 GNUNET_break_op (0);
4115 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task &&
4116 GMC_is_pid_bigger (ack, fc->last_ack_recv))
4118 GNUNET_SCHEDULER_cancel (fc->poll_task);
4119 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
4120 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
4122 fc->last_ack_recv = ack;
4123 peer_unlock_queue (id);
4125 if (t->next_hop == id)
4126 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
4128 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK);
4135 * Core handler for mesh network traffic point-to-point ack polls.
4137 * @param cls closure
4138 * @param message message
4139 * @param peer peer identity this notification is about
4141 * @return GNUNET_OK to keep the connection open,
4142 * GNUNET_SYSERR to close it (signal serious error)
4145 handle_mesh_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
4146 const struct GNUNET_MessageHeader *message)
4148 struct GNUNET_MESH_Poll *msg;
4149 struct MeshTunnel *t;
4150 struct MeshFlowControl *fc;
4155 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an POLL packet from %s!\n",
4158 msg = (struct GNUNET_MESH_Poll *) message;
4160 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4164 /* TODO notify that we dont know this tunnel (whom)? */
4165 GNUNET_STATISTICS_update (stats, "# poll on unknown tunnel", 1, GNUNET_NO);
4166 GNUNET_break_op (0);
4170 /* Is this a forward or backward ACK? */
4171 id = GNUNET_PEER_search(peer);
4172 pid = ntohl (msg->pid);
4173 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PID %u\n", pid);
4174 if (t->next_hop == id)
4176 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from FWD\n");
4177 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " was %u\n", t->next_fc.last_pid_recv);
4179 old = fc->last_pid_recv;
4180 fc->last_pid_recv = pid;
4181 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
4183 else if (t->prev_hop == id)
4185 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from BCK\n");
4186 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " was %u\n", t->prev_fc.last_pid_recv);
4188 old = fc->last_pid_recv;
4189 fc->last_pid_recv = pid;
4190 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL);
4195 if (GNUNET_YES == t->reliable)
4196 fc->last_pid_recv = old;
4203 * Core handler for mesh keepalives.
4205 * @param cls closure
4206 * @param message message
4207 * @param peer peer identity this notification is about
4208 * @return GNUNET_OK to keep the connection open,
4209 * GNUNET_SYSERR to close it (signal serious error)
4211 * TODO: Check who we got this from, to validate route.
4214 handle_mesh_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
4215 const struct GNUNET_MessageHeader *message)
4217 struct GNUNET_MESH_TunnelKeepAlive *msg;
4218 struct MeshTunnel *t;
4220 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
4223 msg = (struct GNUNET_MESH_TunnelKeepAlive *) message;
4224 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4228 /* TODO notify that we dont know that tunnel */
4229 GNUNET_STATISTICS_update (stats, "# keepalive on unknown tunnel", 1,
4234 tunnel_reset_timeout (t);
4235 if (NULL != t->client || 0 == t->next_hop || myid == t->next_hop)
4238 GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
4239 send_prebuilt_message (message, t->next_hop, t);
4246 * Functions to handle messages from core
4248 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
4249 {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0},
4250 {&handle_mesh_path_broken, GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN,
4251 sizeof (struct GNUNET_MESH_PathBroken)},
4252 {&handle_mesh_tunnel_destroy, GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY,
4253 sizeof (struct GNUNET_MESH_TunnelDestroy)},
4254 {&handle_mesh_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
4255 {&handle_mesh_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
4256 {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK,
4257 sizeof (struct GNUNET_MESH_DataACK)},
4258 {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK,
4259 sizeof (struct GNUNET_MESH_DataACK)},
4260 {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE,
4261 sizeof (struct GNUNET_MESH_TunnelKeepAlive)},
4262 {&handle_mesh_ack, GNUNET_MESSAGE_TYPE_MESH_ACK,
4263 sizeof (struct GNUNET_MESH_ACK)},
4264 {&handle_mesh_poll, GNUNET_MESSAGE_TYPE_MESH_POLL,
4265 sizeof (struct GNUNET_MESH_Poll)},
4266 {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
4267 sizeof (struct GNUNET_MESH_PathACK)},
4273 /******************************************************************************/
4274 /**************** MESH LOCAL HANDLER HELPERS ***********************/
4275 /******************************************************************************/
4280 * notify_client_connection_failure: notify a client that the connection to the
4281 * requested remote peer is not possible (for instance, no route found)
4282 * Function called when the socket is ready to queue more data. "buf" will be
4283 * NULL and "size" zero if the socket was closed for writing in the meantime.
4285 * @param cls closure
4286 * @param size number of bytes available in buf
4287 * @param buf where the callee should write the message
4288 * @return number of bytes written to buf
4291 notify_client_connection_failure (void *cls, size_t size, void *buf)
4294 struct MeshPeerInfo *peer_info;
4295 struct GNUNET_MESH_PeerControl *msg;
4296 struct GNUNET_PeerIdentity id;
4298 if (0 == size && NULL == buf)
4300 // TODO retry? cancel?
4304 size_needed = sizeof (struct GNUNET_MESH_PeerControl);
4305 peer_info = (struct MeshPeerInfo *) cls;
4306 msg = (struct GNUNET_MESH_PeerControl *) buf;
4307 msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
4308 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED);
4309 // msg->tunnel_id = htonl(peer_info->t->tid);
4310 GNUNET_PEER_resolve (peer_info->id, &id);
4311 memcpy (&msg->peer, &id, sizeof (struct GNUNET_PeerIdentity));
4319 * Send keepalive packets for a tunnel.
4321 * @param cls Closure (tunnel for which to send the keepalive).
4322 * @param tc Notification context.
4324 * FIXME: add a refresh reset in case of normal unicast traffic is doing the job
4327 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4329 struct MeshTunnel *t = cls;
4330 struct GNUNET_MESH_TunnelKeepAlive *msg;
4331 size_t size = sizeof (struct GNUNET_MESH_TunnelKeepAlive);
4334 t->maintenance_task = GNUNET_SCHEDULER_NO_TASK;
4335 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) ||
4336 NULL == t->owner || 0 == t->local_tid)
4341 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4342 "sending keepalive for tunnel %d\n", t->id.tid);
4344 msg = (struct GNUNET_MESH_TunnelKeepAlive *) cbuf;
4345 msg->header.size = htons (size);
4346 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE);
4347 msg->oid = my_full_id;
4348 msg->tid = htonl (t->id.tid);
4349 send_prebuilt_message (&msg->header, t->next_hop, t);
4351 t->maintenance_task =
4352 GNUNET_SCHEDULER_add_delayed (refresh_path_time, &path_refresh, t);
4357 * Function to process paths received for a new peer addition. The recorded
4358 * paths form the initial tunnel, which can be optimized later.
4359 * Called on each result obtained for the DHT search.
4361 * @param cls closure
4362 * @param exp when will this value expire
4363 * @param key key of the result
4364 * @param get_path path of the get request
4365 * @param get_path_length lenght of get_path
4366 * @param put_path path of the put request
4367 * @param put_path_length length of the put_path
4368 * @param type type of the result
4369 * @param size number of bytes in data
4370 * @param data pointer to the result data
4373 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
4374 const struct GNUNET_HashCode * key,
4375 const struct GNUNET_PeerIdentity *get_path,
4376 unsigned int get_path_length,
4377 const struct GNUNET_PeerIdentity *put_path,
4378 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
4379 size_t size, const void *data)
4381 struct MeshPeerInfo *peer = cls;
4382 struct MeshPeerPath *p;
4383 struct GNUNET_PeerIdentity pi;
4386 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got results from DHT!\n");
4387 GNUNET_PEER_resolve (peer->id, &pi);
4388 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&pi));
4390 p = path_build_from_dht (get_path, get_path_length,
4391 put_path, put_path_length);
4392 path_add_to_peers (p, GNUNET_NO);
4394 for (i = 0; i < peer->ntunnels; i++)
4396 struct GNUNET_PeerIdentity id;
4398 GNUNET_PEER_resolve (peer->tunnels[i]->id.oid, &id);
4399 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... tunnel %s:%X (%X / %X)\n",
4400 GNUNET_i2s (&id), peer->tunnels[i]->id.tid,
4401 peer->tunnels[i]->local_tid,
4402 peer->tunnels[i]->local_tid_dest);
4403 if (peer->tunnels[i]->state == MESH_TUNNEL_SEARCHING)
4405 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
4406 peer_connect (peer, peer->tunnels[i]);
4414 /******************************************************************************/
4415 /********************* MESH LOCAL HANDLES **************************/
4416 /******************************************************************************/
4420 * Handler for client connection.
4422 * @param cls Closure (unused).
4423 * @param client Client handler.
4426 handle_local_client_connect (void *cls, struct GNUNET_SERVER_Client *client)
4428 struct MeshClient *c;
4432 c = GNUNET_malloc (sizeof (struct MeshClient));
4434 GNUNET_SERVER_client_keep (client);
4435 GNUNET_SERVER_client_set_user_context (client, c);
4436 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, c);
4441 * Handler for client disconnection
4443 * @param cls closure
4444 * @param client identification of the client; NULL
4445 * for the last call when the server is destroyed
4448 handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
4450 struct MeshClient *c;
4451 struct MeshClient *next;
4453 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected: %p\n", client);
4456 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (SERVER DOWN)\n");
4460 c = client_get (client);
4463 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "matching client found (%u)\n",
4465 GNUNET_SERVER_client_drop (c->handle);
4466 c->shutting_down = GNUNET_YES;
4467 if (NULL != c->own_tunnels)
4469 GNUNET_CONTAINER_multihashmap32_iterate (c->own_tunnels,
4470 &tunnel_destroy_iterator, c);
4471 GNUNET_CONTAINER_multihashmap32_destroy (c->own_tunnels);
4474 if (NULL != c->incoming_tunnels)
4476 GNUNET_CONTAINER_multihashmap32_iterate (c->incoming_tunnels,
4477 &tunnel_destroy_iterator, c);
4478 GNUNET_CONTAINER_multihashmap32_destroy (c->incoming_tunnels);
4481 if (NULL != c->ports)
4482 GNUNET_CONTAINER_multihashmap32_destroy (c->ports);
4484 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, c);
4485 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " CLIENT FREE at %p\n", c);
4487 GNUNET_STATISTICS_update (stats, "# clients", -1, GNUNET_NO);
4492 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " context NULL!\n");
4494 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "done!\n");
4500 * Handler for new clients
4502 * @param cls closure
4503 * @param client identification of the client
4504 * @param message the actual message, which includes messages the client wants
4507 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
4508 const struct GNUNET_MessageHeader *message)
4510 struct GNUNET_MESH_ClientConnect *cc_msg;
4511 struct MeshClient *c;
4516 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client connected %p\n", client);
4518 /* Check data sanity */
4519 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
4520 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
4521 if (0 != (size % sizeof (uint32_t)))
4524 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4527 size /= sizeof (uint32_t);
4529 /* Initialize new client structure */
4530 c = GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
4531 c->id = next_client_id++; /* overflow not important: just for debug */
4532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client id %u\n", c->id);
4533 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client has %u ports\n", size);
4538 p = (uint32_t *) &cc_msg[1];
4539 c->ports = GNUNET_CONTAINER_multihashmap32_create (size);
4540 for (i = 0; i < size; i++)
4543 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port: %u\n", u32);
4545 /* store in client's hashmap */
4546 GNUNET_CONTAINER_multihashmap32_put (c->ports, u32, c,
4547 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
4548 /* store in global hashmap */
4549 /* FIXME only allow one client to have the port open,
4550 * have a backup hashmap with waiting clients */
4551 GNUNET_CONTAINER_multihashmap32_put (ports, u32, c,
4552 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
4556 c->own_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
4557 c->incoming_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
4558 GNUNET_SERVER_notification_context_add (nc, client);
4559 GNUNET_STATISTICS_update (stats, "# clients", 1, GNUNET_NO);
4561 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4562 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client processed\n");
4567 * Handler for requests of new tunnels
4569 * @param cls Closure.
4570 * @param client Identification of the client.
4571 * @param message The actual message.
4574 handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client,
4575 const struct GNUNET_MessageHeader *message)
4577 struct GNUNET_MESH_TunnelMessage *t_msg;
4578 struct MeshPeerInfo *peer_info;
4579 struct MeshTunnel *t;
4580 struct MeshClient *c;
4581 MESH_TunnelNumber tid;
4583 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new tunnel requested\n");
4585 /* Sanity check for client registration */
4586 if (NULL == (c = client_get (client)))
4589 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4592 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4594 /* Message size sanity check */
4595 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
4598 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4602 t_msg = (struct GNUNET_MESH_TunnelMessage *) message;
4603 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " towards %s\n",
4604 GNUNET_i2s (&t_msg->peer));
4605 /* Sanity check for tunnel numbering */
4606 tid = ntohl (t_msg->tunnel_id);
4607 if (0 == (tid & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI))
4610 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4613 /* Sanity check for duplicate tunnel IDs */
4614 if (NULL != tunnel_get_by_local_id (c, tid))
4617 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4622 while (NULL != tunnel_get_by_pi (myid, next_tid))
4623 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
4624 t = tunnel_new (myid, next_tid, c, tid);
4625 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
4629 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4632 t->port = ntohl (t_msg->port);
4633 tunnel_set_options (t, ntohl (t_msg->options));
4634 if (GNUNET_YES == t->reliable)
4636 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
4637 t->fwd_rel = GNUNET_malloc (sizeof (struct MeshTunnelReliability));
4639 t->fwd_rel->expected_delay = MESH_RETRANSMIT_TIME;
4642 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATED TUNNEL %s[%x]:%u (%x)\n",
4643 GNUNET_i2s (&my_full_id), t->id.tid, t->port, t->local_tid);
4645 peer_info = peer_get (&t_msg->peer);
4646 peer_info_add_tunnel (peer_info, t);
4647 peer_connect (peer_info, t);
4648 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4654 * Handler for requests of deleting tunnels
4656 * @param cls closure
4657 * @param client identification of the client
4658 * @param message the actual message
4661 handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
4662 const struct GNUNET_MessageHeader *message)
4664 struct GNUNET_MESH_TunnelMessage *tunnel_msg;
4665 struct MeshClient *c;
4666 struct MeshTunnel *t;
4667 MESH_TunnelNumber tid;
4669 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4670 "Got a DESTROY TUNNEL from client!\n");
4672 /* Sanity check for client registration */
4673 if (NULL == (c = client_get (client)))
4676 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4679 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4681 /* Message sanity check */
4682 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
4685 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4689 tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message;
4691 /* Retrieve tunnel */
4692 tid = ntohl (tunnel_msg->tunnel_id);
4693 t = tunnel_get_by_local_id(c, tid);
4696 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " tunnel %X not found\n", tid);
4698 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4702 /* Cleanup after the tunnel */
4703 client_delete_tunnel (c, t);
4710 peer_info_remove_tunnel (peer_get_short (t->dest), t);
4714 /* The tunnel will be destroyed when the last message is transmitted. */
4715 tunnel_destroy_empty (t);
4717 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4723 * Handler for client traffic
4725 * @param cls closure
4726 * @param client identification of the client
4727 * @param message the actual message
4730 handle_local_data (void *cls, struct GNUNET_SERVER_Client *client,
4731 const struct GNUNET_MessageHeader *message)
4733 struct GNUNET_MESH_LocalData *data_msg;
4734 struct MeshClient *c;
4735 struct MeshTunnel *t;
4736 struct MeshFlowControl *fc;
4737 MESH_TunnelNumber tid;
4740 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4741 "Got data from a client!\n");
4743 /* Sanity check for client registration */
4744 if (NULL == (c = client_get (client)))
4747 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4750 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4752 data_msg = (struct GNUNET_MESH_LocalData *) message;
4754 /* Sanity check for message size */
4755 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_LocalData);
4756 if (size < sizeof (struct GNUNET_MessageHeader))
4759 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4763 /* Tunnel exists? */
4764 tid = ntohl (data_msg->tid);
4765 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI)
4768 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4771 t = tunnel_get_by_local_id (c, tid);
4775 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4779 /* Is the client in the tunnel? */
4780 if ( !( (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV &&
4782 t->owner->handle == client)
4784 (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV &&
4786 t->client->handle == client) ) )
4789 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4793 /* Ok, everything is correct, send the message
4794 * (pretend we got it from a mesh peer)
4797 struct GNUNET_MESH_Data *payload;
4798 char cbuf[sizeof(struct GNUNET_MESH_Data) + size];
4800 fc = tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV ? &t->prev_fc : &t->next_fc;
4801 if (GNUNET_YES == t->reliable)
4803 struct MeshTunnelReliability *rel;
4804 struct MeshReliableMessage *copy;
4806 rel = (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) ? t->fwd_rel : t->bck_rel;
4807 copy = GNUNET_malloc (sizeof (struct MeshReliableMessage)
4808 + sizeof(struct GNUNET_MESH_Data)
4810 copy->mid = rel->mid_sent++;
4811 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! DATA %llu\n", copy->mid);
4812 copy->timestamp = GNUNET_TIME_absolute_get ();
4815 GNUNET_CONTAINER_DLL_insert_tail (rel->head_sent, rel->tail_sent, copy);
4816 if (GNUNET_SCHEDULER_NO_TASK == rel->retry_task)
4819 GNUNET_TIME_relative_multiply (rel->expected_delay,
4820 MESH_RETRANSMIT_MARGIN);
4822 GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
4823 &tunnel_retransmit_message,
4826 payload = (struct GNUNET_MESH_Data *) ©[1];
4827 payload->mid = GNUNET_htonll (copy->mid);
4831 payload = (struct GNUNET_MESH_Data *) cbuf;
4833 // FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
4834 // use different struct for unreliable traffic, save 8 bytes
4836 memcpy (&payload[1], &data_msg[1], size);
4837 payload->header.size = htons (sizeof (struct GNUNET_MESH_Data) + size);
4838 payload->header.type = htons (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV ?
4839 GNUNET_MESSAGE_TYPE_MESH_UNICAST :
4840 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
4841 GNUNET_PEER_resolve(t->id.oid, &payload->oid);;
4842 payload->tid = htonl (t->id.tid);
4843 payload->ttl = htonl (default_ttl);
4844 payload->pid = htonl (fc->last_pid_recv + 1);
4845 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4846 " calling generic handler...\n");
4847 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
4848 handle_mesh_unicast (NULL, &my_full_id, &payload->header);
4850 handle_mesh_to_orig (NULL, &my_full_id, &payload->header);
4852 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "receive done OK\n");
4853 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4860 * Handler for client's ACKs for payload traffic.
4862 * @param cls Closure (unused).
4863 * @param client Identification of the client.
4864 * @param message The actual message.
4867 handle_local_ack (void *cls, struct GNUNET_SERVER_Client *client,
4868 const struct GNUNET_MessageHeader *message)
4870 struct GNUNET_MESH_LocalAck *msg;
4871 struct MeshTunnel *t;
4872 struct MeshClient *c;
4873 MESH_TunnelNumber tid;
4875 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a local ACK\n");
4876 /* Sanity check for client registration */
4877 if (NULL == (c = client_get (client)))
4880 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4883 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
4885 msg = (struct GNUNET_MESH_LocalAck *) message;
4887 /* Tunnel exists? */
4888 tid = ntohl (msg->tunnel_id);
4889 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", tid);
4890 t = tunnel_get_by_local_id (c, tid);
4894 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Tunnel %X unknown.\n", tid);
4895 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id);
4896 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4900 /* Does client own tunnel? I.E: Is this an ACK for BCK traffic? */
4903 /* The client owns the tunnel, ACK is for data to_origin, send BCK ACK. */
4904 t->prev_fc.last_ack_recv++;
4905 tunnel_send_bck_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
4909 /* The client doesn't own the tunnel, this ACK is for FWD traffic. */
4910 t->next_fc.last_ack_recv++;
4911 tunnel_send_fwd_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
4914 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4922 * Iterator over all tunnels to send a monitoring client info about each tunnel.
4924 * @param cls Closure (client handle).
4925 * @param key Key (hashed tunnel ID, unused).
4926 * @param value Tunnel info.
4928 * @return GNUNET_YES, to keep iterating.
4931 monitor_all_tunnels_iterator (void *cls,
4932 const struct GNUNET_HashCode * key,
4935 struct GNUNET_SERVER_Client *client = cls;
4936 struct MeshTunnel *t = value;
4937 struct GNUNET_MESH_LocalMonitor *msg;
4939 msg = GNUNET_malloc (sizeof(struct GNUNET_MESH_LocalMonitor));
4940 GNUNET_PEER_resolve(t->id.oid, &msg->owner);
4941 msg->tunnel_id = htonl (t->id.tid);
4942 msg->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
4943 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS);
4944 GNUNET_PEER_resolve (t->dest, &msg->destination);
4946 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4947 "* sending info about tunnel %s [%u]\n",
4948 GNUNET_i2s (&msg->owner), t->id.tid);
4950 GNUNET_SERVER_notification_context_unicast (nc, client,
4951 &msg->header, GNUNET_NO);
4957 * Handler for client's MONITOR request.
4959 * @param cls Closure (unused).
4960 * @param client Identification of the client.
4961 * @param message The actual message.
4964 handle_local_get_tunnels (void *cls, struct GNUNET_SERVER_Client *client,
4965 const struct GNUNET_MessageHeader *message)
4967 struct MeshClient *c;
4969 /* Sanity check for client registration */
4970 if (NULL == (c = client_get (client)))
4973 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4977 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4978 "Received get tunnels request from client %u\n",
4980 GNUNET_CONTAINER_multihashmap_iterate (tunnels,
4981 monitor_all_tunnels_iterator,
4983 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4984 "Get tunnels request from client %u completed\n",
4986 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4991 * Handler for client's MONITOR_TUNNEL request.
4993 * @param cls Closure (unused).
4994 * @param client Identification of the client.
4995 * @param message The actual message.
4998 handle_local_show_tunnel (void *cls, struct GNUNET_SERVER_Client *client,
4999 const struct GNUNET_MessageHeader *message)
5001 const struct GNUNET_MESH_LocalMonitor *msg;
5002 struct GNUNET_MESH_LocalMonitor *resp;
5003 struct MeshClient *c;
5004 struct MeshTunnel *t;
5006 /* Sanity check for client registration */
5007 if (NULL == (c = client_get (client)))
5010 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5014 msg = (struct GNUNET_MESH_LocalMonitor *) message;
5015 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5016 "Received tunnel info request from client %u for tunnel %s[%X]\n",
5019 ntohl (msg->tunnel_id));
5020 t = tunnel_get (&msg->owner, ntohl (msg->tunnel_id));
5023 /* We don't know the tunnel FIXME */
5024 struct GNUNET_MESH_LocalMonitor warn;
5027 GNUNET_SERVER_notification_context_unicast (nc, client,
5030 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5034 /* Initialize context */
5035 resp = GNUNET_malloc (sizeof (struct GNUNET_MESH_LocalMonitor));
5037 GNUNET_PEER_resolve (t->dest, &resp->destination);
5038 resp->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
5039 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
5040 &resp->header, GNUNET_NO);
5043 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5044 "Monitor tunnel request from client %u completed\n",
5046 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5051 * Functions to handle messages from clients
5053 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
5054 {&handle_local_new_client, NULL,
5055 GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
5056 {&handle_local_tunnel_create, NULL,
5057 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE,
5058 sizeof (struct GNUNET_MESH_TunnelMessage)},
5059 {&handle_local_tunnel_destroy, NULL,
5060 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY,
5061 sizeof (struct GNUNET_MESH_TunnelMessage)},
5062 {&handle_local_data, NULL,
5063 GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA, 0},
5064 {&handle_local_ack, NULL,
5065 GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK,
5066 sizeof (struct GNUNET_MESH_LocalAck)},
5067 {&handle_local_get_tunnels, NULL,
5068 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS,
5069 sizeof (struct GNUNET_MessageHeader)},
5070 {&handle_local_show_tunnel, NULL,
5071 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL,
5072 sizeof (struct GNUNET_MESH_LocalMonitor)},
5078 * Method called whenever a given peer connects.
5080 * @param cls closure
5081 * @param peer peer identity this notification is about
5084 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
5086 struct MeshPeerInfo *peer_info;
5087 struct MeshPeerPath *path;
5089 DEBUG_CONN ("Peer connected\n");
5090 DEBUG_CONN (" %s\n", GNUNET_i2s (&my_full_id));
5091 peer_info = peer_get (peer);
5092 if (myid == peer_info->id)
5094 DEBUG_CONN (" (self)\n");
5095 path = path_new (1);
5099 DEBUG_CONN (" %s\n", GNUNET_i2s (peer));
5100 path = path_new (2);
5101 path->peers[1] = peer_info->id;
5102 GNUNET_PEER_change_rc (peer_info->id, 1);
5103 GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO);
5105 path->peers[0] = myid;
5106 GNUNET_PEER_change_rc (myid, 1);
5107 peer_info_add_path (peer_info, path, GNUNET_YES);
5113 * Method called whenever a peer disconnects.
5115 * @param cls closure
5116 * @param peer peer identity this notification is about
5119 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
5121 struct MeshPeerInfo *pi;
5122 struct MeshPeerQueue *q;
5123 struct MeshPeerQueue *n;
5125 DEBUG_CONN ("Peer disconnected\n");
5126 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
5136 /* TODO try to reroute this traffic instead */
5137 queue_destroy(q, GNUNET_YES);
5140 if (NULL != pi->core_transmit)
5142 GNUNET_CORE_notify_transmit_ready_cancel(pi->core_transmit);
5143 pi->core_transmit = NULL;
5145 peer_remove_path (pi, pi->id, myid);
5148 DEBUG_CONN (" (self)\n");
5150 GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO);
5156 * Install server (service) handlers and start listening to clients.
5161 GNUNET_SERVER_add_handlers (server_handle, client_handlers);
5162 GNUNET_SERVER_connect_notify (server_handle,
5163 &handle_local_client_connect, NULL);
5164 GNUNET_SERVER_disconnect_notify (server_handle,
5165 &handle_local_client_disconnect, NULL);
5166 nc = GNUNET_SERVER_notification_context_create (server_handle, 1);
5168 clients_head = NULL;
5169 clients_tail = NULL;
5171 GNUNET_SERVER_resume (server_handle);
5176 * To be called on core init/fail.
5178 * @param cls Closure (config)
5179 * @param server handle to the server for this service
5180 * @param identity the public identity of this peer
5183 core_init (void *cls, struct GNUNET_CORE_Handle *server,
5184 const struct GNUNET_PeerIdentity *identity)
5186 const struct GNUNET_CONFIGURATION_Handle *c = cls;
5189 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
5190 GNUNET_break (core_handle == server);
5191 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)) ||
5194 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
5195 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5197 GNUNET_i2s (identity));
5198 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5200 GNUNET_i2s (&my_full_id));
5201 GNUNET_CORE_disconnect (core_handle);
5202 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
5203 NULL, /* Closure passed to MESH functions */
5204 &core_init, /* Call core_init once connected */
5205 &core_connect, /* Handle connects */
5206 &core_disconnect, /* remove peers on disconnects */
5207 NULL, /* Don't notify about all incoming messages */
5208 GNUNET_NO, /* For header only in notification */
5209 NULL, /* Don't notify about all outbound messages */
5210 GNUNET_NO, /* For header-only out notification */
5211 core_handlers); /* Register these handlers */
5220 /******************************************************************************/
5221 /************************ MAIN FUNCTIONS ****************************/
5222 /******************************************************************************/
5225 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
5227 * @param cls closure
5228 * @param key current key code
5229 * @param value value in the hash map
5230 * @return GNUNET_YES if we should continue to iterate,
5234 shutdown_tunnel (void *cls, const struct GNUNET_HashCode * key, void *value)
5236 struct MeshTunnel *t = value;
5243 * Iterator over peer hash map entries to destroy the tunnel during shutdown.
5245 * @param cls closure
5246 * @param key current key code
5247 * @param value value in the hash map
5248 * @return GNUNET_YES if we should continue to iterate,
5252 shutdown_peer (void *cls, const struct GNUNET_HashCode * key, void *value)
5254 struct MeshPeerInfo *p = value;
5255 struct MeshPeerQueue *q;
5256 struct MeshPeerQueue *n;
5264 queue_destroy(q, GNUNET_YES);
5268 peer_info_destroy (p);
5274 * Task run during shutdown.
5280 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
5282 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n");
5284 if (core_handle != NULL)
5286 GNUNET_CORE_disconnect (core_handle);
5289 GNUNET_CONTAINER_multihashmap_iterate (tunnels, &shutdown_tunnel, NULL);
5290 GNUNET_CONTAINER_multihashmap_iterate (peers, &shutdown_peer, NULL);
5291 if (dht_handle != NULL)
5293 GNUNET_DHT_disconnect (dht_handle);
5298 GNUNET_SERVER_notification_context_destroy (nc);
5301 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
5303 GNUNET_SCHEDULER_cancel (announce_id_task);
5304 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
5306 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shut down\n");
5311 * Process mesh requests.
5313 * @param cls closure
5314 * @param server the initialized server
5315 * @param c configuration to use
5318 run (void *cls, struct GNUNET_SERVER_Handle *server,
5319 const struct GNUNET_CONFIGURATION_Handle *c)
5322 struct GNUNET_CRYPTO_EccPrivateKey *pk;
5324 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n");
5325 server_handle = server;
5326 GNUNET_SERVER_suspend (server_handle);
5329 GNUNET_CONFIGURATION_get_value_filename (c, "PEER", "PRIVATE_KEY",
5332 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5334 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5335 "mesh", "peer/privatekey");
5336 GNUNET_SCHEDULER_shutdown ();
5341 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_PATH_TIME",
5342 &refresh_path_time))
5344 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5346 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5347 "mesh", "refresh path time");
5348 GNUNET_SCHEDULER_shutdown ();
5353 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "ID_ANNOUNCE_TIME",
5356 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5358 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5359 "mesh", "id announce time");
5360 GNUNET_SCHEDULER_shutdown ();
5365 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "CONNECT_TIMEOUT",
5368 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5370 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5371 "mesh", "connect timeout");
5372 GNUNET_SCHEDULER_shutdown ();
5377 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
5380 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5382 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5383 "mesh", "max msgs queue");
5384 GNUNET_SCHEDULER_shutdown ();
5389 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_TUNNELS",
5392 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5394 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5395 "mesh", "max tunnels");
5396 GNUNET_SCHEDULER_shutdown ();
5401 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
5404 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5406 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5407 "mesh", "default ttl", 64);
5412 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_PEERS",
5415 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5416 _("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5417 "mesh", "max peers", 1000);
5422 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DROP_PERCENT",
5429 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5430 "Mesh is running with drop mode enabled. "
5431 "This is NOT a good idea! "
5432 "Remove the DROP_PERCENT option from your configuration.\n");
5436 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DHT_REPLICATION_LEVEL",
5437 &dht_replication_level))
5439 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5441 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5442 "mesh", "dht replication level", 3);
5443 dht_replication_level = 3;
5446 tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
5447 incoming_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
5448 peers = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
5449 ports = GNUNET_CONTAINER_multihashmap32_create (32);
5451 dht_handle = GNUNET_DHT_connect (c, 64);
5452 if (NULL == dht_handle)
5456 stats = GNUNET_STATISTICS_create ("mesh", c);
5458 /* Scheduled the task to clean up when shutdown is called */
5459 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
5461 pk = GNUNET_CRYPTO_ecc_key_create_from_file (keyfile);
5462 GNUNET_free (keyfile);
5463 GNUNET_assert (NULL != pk);
5464 my_private_key = pk;
5465 GNUNET_CRYPTO_ecc_key_get_public (my_private_key, &my_public_key);
5466 GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
5467 &my_full_id.hashPubKey);
5468 myid = GNUNET_PEER_intern (&my_full_id);
5469 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5470 "Mesh for peer [%s] starting\n",
5471 GNUNET_i2s(&my_full_id));
5473 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
5474 NULL, /* Closure passed to MESH functions */
5475 &core_init, /* Call core_init once connected */
5476 &core_connect, /* Handle connects */
5477 &core_disconnect, /* remove peers on disconnects */
5478 NULL, /* Don't notify about all incoming messages */
5479 GNUNET_NO, /* For header only in notification */
5480 NULL, /* Don't notify about all outbound messages */
5481 GNUNET_NO, /* For header-only out notification */
5482 core_handlers); /* Register these handlers */
5483 if (NULL == core_handle)
5486 GNUNET_SCHEDULER_shutdown ();
5490 next_local_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
5491 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
5492 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mesh service running\n");
5497 * The main function for the mesh service.
5499 * @param argc number of arguments from the command line
5500 * @param argv command line arguments
5501 * @return 0 ok, 1 on error
5504 main (int argc, char *const *argv)
5509 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main()\n");
5510 r = GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
5512 ret = (GNUNET_OK == r) ? 0 : 1;
5513 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main() END\n");
5517 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5518 "Mesh for peer [%s] FWD ACKs %u, BCK ACKs %u\n",
5519 GNUNET_i2s(&my_full_id), debug_fwd_ack, debug_bck_ack);