2 This file is part of GNUnet.
3 (C) 2011 Christian Grothoff (and other contributing authors)
4 GNUnet is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published
6 by the Free Software Foundation; either version 3, or (at your
7 option) any later version.
8 GNUnet is distributed in the hope that it will be useful, but
9 WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 General Public License for more details.
12 You should have received a copy of the GNU General Public License
13 along with GNUnet; see the file COPYING. If not, write to the
14 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
15 Boston, MA 02111-1307, USA.
19 * @file mesh/mesh_api.c
20 * @brief mesh api: client implementation of mesh service
21 * @author Bartlomiej Polot
26 * - AUXILIARY FUNCTIONS
29 * - API CALL DEFINITIONS
34 #if 0 /* keep Emacsens' auto-indent happy */
40 #include "gnunet_common.h"
41 #include "gnunet_client_lib.h"
42 #include "gnunet_util_lib.h"
43 #include "gnunet_peer_lib.h"
44 #include "gnunet_mesh_service.h"
46 #include "mesh_protocol.h"
48 #define MESH_API_DEBUG GNUNET_YES
50 #define LOG(kind,...) GNUNET_log_from (kind, "mesh-api",__VA_ARGS__)
52 /******************************************************************************/
53 /************************ DATA STRUCTURES ****************************/
54 /******************************************************************************/
57 * Transmission queue to the service
59 struct GNUNET_MESH_TransmitHandle
65 struct GNUNET_MESH_TransmitHandle *next;
70 struct GNUNET_MESH_TransmitHandle *prev;
73 * Tunnel this message is sent on / for (may be NULL for control messages).
75 struct GNUNET_MESH_Tunnel *tunnel;
78 * Callback to obtain the message to transmit, or NULL if we
79 * got the message in 'data'. Notice that messages built
80 * by 'notify' need to be encapsulated with information about
83 GNUNET_CONNECTION_TransmitReadyNotify notify;
86 * Closure for 'notify'
91 * How long is this message valid. Once the timeout has been
92 * reached, the message must no longer be sent. If this
93 * is a message with a 'notify' callback set, the 'notify'
94 * function should be called with 'buf' NULL and size 0.
96 struct GNUNET_TIME_Absolute timeout;
99 * Task triggering a timeout, can be NO_TASK if the timeout is FOREVER.
101 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
104 * Priority of the message. The queue is sorted by priority,
105 * control messages have the maximum priority (UINT32_MAX).
110 * Target of the message, 0 for multicast. This field
111 * is only valid if 'notify' is non-NULL.
113 GNUNET_PEER_Id target;
116 * Size of 'data' -- or the desired size of 'notify' if 'data' is NULL.
123 * Opaque handle to the service.
125 struct GNUNET_MESH_Handle
129 * Handle to the server connection, to send messages later
131 struct GNUNET_CLIENT_Connection *client;
134 * Set of handlers used for processing incoming messages in the tunnels
136 const struct GNUNET_MESH_MessageHandler *message_handlers;
139 * Set of applications that should be claimed to be offered at this node.
140 * Note that this is just informative, the appropiate handlers must be
141 * registered independently and the mapping is up to the developer of the
142 * client application.
144 const GNUNET_MESH_ApplicationType *applications;
147 * Double linked list of the tunnels this client is connected to.
149 struct GNUNET_MESH_Tunnel *tunnels_head;
150 struct GNUNET_MESH_Tunnel *tunnels_tail;
153 * Callback for inbound tunnel creation
155 GNUNET_MESH_InboundTunnelNotificationHandler *new_tunnel;
158 * Callback for inbound tunnel disconnection
160 GNUNET_MESH_TunnelEndHandler *cleaner;
163 * Handle to cancel pending transmissions in case of disconnection
165 struct GNUNET_CLIENT_TransmitHandle *th;
168 * Closure for all the handlers given by the client
173 * Messages to send to the service
175 struct GNUNET_MESH_TransmitHandle *th_head;
176 struct GNUNET_MESH_TransmitHandle *th_tail;
179 * tid of the next tunnel to create (to avoid reusing IDs often)
181 MESH_TunnelNumber next_tid;
182 unsigned int n_handlers;
183 unsigned int n_applications;
184 unsigned int max_queue_size;
187 * Have we started the task to receive messages from the service
188 * yet? We do this after we send the 'MESH_LOCAL_CONNECT' message.
193 * Number of packets queued
195 unsigned int npackets;
198 * Configuration given by the client, in case of reconnection
200 const struct GNUNET_CONFIGURATION_Handle *cfg;
203 * Time to the next reconnect in case one reconnect fails
205 struct GNUNET_TIME_Relative reconnect_time;
210 * Description of a peer
212 struct GNUNET_MESH_Peer
215 * ID of the peer in short form
220 * Tunnel this peer belongs to
222 struct GNUNET_MESH_Tunnel *t;
225 * Flag indicating whether service has informed about its connection
233 * Opaque handle to a tunnel.
235 struct GNUNET_MESH_Tunnel
241 struct GNUNET_MESH_Tunnel *next;
242 struct GNUNET_MESH_Tunnel *prev;
245 * Callback to execute when peers connect to the tunnel
247 GNUNET_MESH_PeerConnectHandler connect_handler;
250 * Callback to execute when peers disconnect from the tunnel
252 GNUNET_MESH_PeerDisconnectHandler disconnect_handler;
255 * Closure for the connect/disconnect handlers
260 * Handle to the mesh this tunnel belongs to
262 struct GNUNET_MESH_Handle *mesh;
265 * Local ID of the tunnel
267 MESH_TunnelNumber tid;
270 * Owner of the tunnel. 0 if the tunnel is the local client.
272 GNUNET_PEER_Id owner;
275 * All peers added to the tunnel
277 struct GNUNET_MESH_Peer **peers;
280 * List of application types that have been requested for this tunnel
282 GNUNET_MESH_ApplicationType *apps;
285 * Any data the caller wants to put in here
290 * Number of peers added to the tunnel
295 * Number of packets queued in this tunnel
297 unsigned int npackets;
300 * Number of applications requested this tunnel
307 /******************************************************************************/
308 /*********************** AUXILIARY FUNCTIONS *************************/
309 /******************************************************************************/
312 * Get the tunnel handler for the tunnel specified by id from the given handle
313 * @param h Mesh handle
314 * @param tid ID of the wanted tunnel
315 * @return handle to the required tunnel or NULL if not found
317 static struct GNUNET_MESH_Tunnel *
318 retrieve_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid)
320 struct GNUNET_MESH_Tunnel *t;
334 * Create a new tunnel and insert it in the tunnel list of the mesh handle
335 * @param h Mesh handle
336 * @param tid desired tid of the tunnel, 0 to assign one automatically
337 * @return handle to the created tunnel
339 static struct GNUNET_MESH_Tunnel *
340 create_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid)
342 struct GNUNET_MESH_Tunnel *t;
344 t = GNUNET_malloc (sizeof (struct GNUNET_MESH_Tunnel));
345 GNUNET_CONTAINER_DLL_insert (h->tunnels_head, h->tunnels_tail, t);
349 t->tid = h->next_tid;
350 while (NULL != retrieve_tunnel (h, h->next_tid))
353 h->next_tid &= ~GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
354 h->next_tid |= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
366 * Destroy the specified tunnel.
367 * - Destroys all peers, calling the disconnect callback on each if needed
368 * - Cancels all outgoing traffic for that tunnel, calling respective notifys
369 * - Calls cleaner if tunnel was inbound
370 * - Frees all memory used
372 * @param t Pointer to the tunnel.
373 * @param call_handler Whether to call the cleaner handler.
375 * @return Handle to the required tunnel or NULL if not found.
378 destroy_tunnel (struct GNUNET_MESH_Tunnel *t, int call_cleaner)
380 struct GNUNET_MESH_Handle *h;
381 struct GNUNET_PeerIdentity pi;
382 struct GNUNET_MESH_TransmitHandle *th;
383 struct GNUNET_MESH_TransmitHandle *aux;
398 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
399 if (NULL == h->th_head && NULL != h->th)
401 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
404 if (NULL != th->notify)
405 th->notify (th->notify_cls, 0, NULL);
406 if (GNUNET_SCHEDULER_NO_TASK != th->timeout_task)
407 GNUNET_SCHEDULER_cancel (th->timeout_task);
416 GNUNET_CONTAINER_DLL_remove (h->tunnels_head, h->tunnels_tail, t);
417 for (i = 0; i < t->npeers; i++)
419 if (NULL != t->disconnect_handler && t->peers[i]->connected)
421 GNUNET_PEER_resolve (t->peers[i]->id, &pi);
422 t->disconnect_handler (t->cls, &pi);
424 GNUNET_PEER_change_rc (t->peers[i]->id, -1);
425 GNUNET_free (t->peers[i]);
428 GNUNET_free (t->peers);
429 if (NULL != h->cleaner && 0 != t->owner && GNUNET_YES == call_cleaner)
430 h->cleaner (h->cls, t, t->ctx);
432 GNUNET_PEER_change_rc (t->owner, -1);
433 if (0 != t->napps && t->apps)
434 GNUNET_free (t->apps);
441 * Get the peer descriptor for the peer with id from the given tunnel
442 * @param t Tunnel handle
443 * @param id Short form ID of the wanted peer
444 * @return handle to the requested peer or NULL if not found
446 static struct GNUNET_MESH_Peer *
447 retrieve_peer (struct GNUNET_MESH_Tunnel *t, GNUNET_PEER_Id id)
451 for (i = 0; i < t->npeers; i++)
452 if (t->peers[i]->id == id)
459 * Add a peer into a tunnel
460 * @param t Tunnel handle
461 * @param pi Full ID of the new peer
462 * @return handle to the newly created peer
464 static struct GNUNET_MESH_Peer *
465 add_peer_to_tunnel (struct GNUNET_MESH_Tunnel *t,
466 const struct GNUNET_PeerIdentity *pi)
468 struct GNUNET_MESH_Peer *p;
476 id = GNUNET_PEER_intern (pi);
478 p = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
481 GNUNET_array_append (t->peers, t->npeers, p);
487 * Remove a peer from a tunnel
488 * @param p Peer handle
491 remove_peer_from_tunnel (struct GNUNET_MESH_Peer *p)
495 for (i = 0; i < p->t->npeers; i++)
497 if (p->t->peers[i] == p)
500 if (i == p->t->npeers)
505 p->t->peers[i] = p->t->peers[p->t->npeers - 1];
506 GNUNET_array_grow (p->t->peers, p->t->npeers, p->t->npeers - 1);
511 * Notify client that the transmission has timed out
513 * @param tc task context
516 timeout_transmission (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
518 struct GNUNET_MESH_TransmitHandle *th = cls;
519 struct GNUNET_MESH_Handle *mesh;
521 mesh = th->tunnel->mesh;
522 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
523 if (th->notify != NULL)
524 th->notify (th->notify_cls, 0, NULL);
526 if ((NULL == mesh->th_head) && (NULL != mesh->th))
528 /* queue empty, no point in asking for transmission */
529 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
536 * Add a transmit handle to the transmission queue by priority and set the
539 * @param h mesh handle with the queue head and tail
540 * @param th handle to the packet to be transmitted
543 add_to_queue (struct GNUNET_MESH_Handle *h,
544 struct GNUNET_MESH_TransmitHandle *th)
546 struct GNUNET_MESH_TransmitHandle *p;
549 while ((NULL != p) && (th->priority <= p->priority))
555 GNUNET_CONTAINER_DLL_insert_after (h->th_head, h->th_tail, p, th);
556 if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value == th->timeout.abs_value)
559 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
560 (th->timeout), &timeout_transmission, th);
565 * Auxiliary function to send an already constructed packet to the service.
566 * Takes care of creating a new queue element, copying the message and
567 * calling the tmt_rdy function if necessary.
569 * @param h mesh handle
570 * @param msg message to transmit
571 * @param tunnel tunnel this send is related to (NULL if N/A)
574 send_packet (struct GNUNET_MESH_Handle *h,
575 const struct GNUNET_MessageHeader *msg,
576 struct GNUNET_MESH_Tunnel *tunnel);
580 * Reconnect callback: tries to reconnect again after a failer previous
582 * @param cls closure (mesh handle)
583 * @param tc task context
586 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
590 * Send a connect packet to the service with the applications and types
591 * requested by the user.
593 * @param h The mesh handle.
597 send_connect (struct GNUNET_MESH_Handle *h)
601 size = sizeof (struct GNUNET_MESH_ClientConnect);
602 size += h->n_applications * sizeof (GNUNET_MESH_ApplicationType);
603 size += h->n_handlers * sizeof (uint16_t);
606 struct GNUNET_MESH_ClientConnect *msg;
607 GNUNET_MESH_ApplicationType *apps;
612 /* build connection packet */
613 msg = (struct GNUNET_MESH_ClientConnect *) buf;
614 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT);
615 msg->header.size = htons (size);
616 apps = (GNUNET_MESH_ApplicationType *) &msg[1];
617 for (napps = 0; napps < h->n_applications; napps++)
619 apps[napps] = htonl (h->applications[napps]);
620 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: app %u\n", h->applications[napps]);
622 types = (uint16_t *) & apps[napps];
623 for (ntypes = 0; ntypes < h->n_handlers; ntypes++)
624 types[ntypes] = htons (h->message_handlers[ntypes].type);
625 msg->applications = htons (napps);
626 msg->types = htons (ntypes);
628 LOG (GNUNET_ERROR_TYPE_DEBUG,
629 "mesh: Sending %lu bytes long message %d types and %d apps\n",
630 ntohs (msg->header.size), ntypes, napps);
632 send_packet (h, &msg->header, NULL);
638 * Reconnect to the service, retransmit all infomation to try to restore the
641 * @param h handle to the mesh
643 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
646 reconnect (struct GNUNET_MESH_Handle *h)
648 struct GNUNET_MESH_Tunnel *t;
652 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: *****************************\n");
653 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: ******* RECONNECT *******\n");
654 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: *****************************\n");
656 h->in_receive = GNUNET_NO;
660 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
662 if (NULL != h->client)
664 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
668 h->client = GNUNET_CLIENT_connect ("mesh", h->cfg);
669 if (h->client == NULL)
671 GNUNET_SCHEDULER_add_delayed (h->reconnect_time, &reconnect_cbk, h);
673 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
674 GNUNET_TIME_relative_multiply
675 (h->reconnect_time, 2));
676 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Next retry in %sms\n",
677 GNUNET_TIME_relative_to_string (h->reconnect_time));
683 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
686 /* Rebuild all tunnels */
687 for (t = h->tunnels_head; NULL != t; t = t->next)
689 struct GNUNET_MESH_TunnelMessage tmsg;
690 struct GNUNET_MESH_PeerControl pmsg;
692 if (t->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
694 /* Tunnel was created by service (incoming tunnel) */
695 /* TODO: Notify service of missing tunnel, to request
696 * creator to recreate path (find a path to him via DHT?)
700 tmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
701 tmsg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
702 tmsg.tunnel_id = htonl (t->tid);
703 send_packet (h, &tmsg.header, t);
705 pmsg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
706 pmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
707 pmsg.tunnel_id = htonl (t->tid);
709 /* Reconnect all peers */
710 for (i = 0; i < t->npeers; i++)
712 GNUNET_PEER_resolve (t->peers[i]->id, &pmsg.peer);
713 if (NULL != t->disconnect_handler && t->peers[i]->connected)
714 t->disconnect_handler (t->cls, &pmsg.peer);
715 /* If the tunnel was "by type", dont connect individual peers */
717 send_packet (t->mesh, &pmsg.header, t);
719 /* Reconnect all types, if any */
720 for (i = 0; i < t->napps; i++)
722 struct GNUNET_MESH_ConnectPeerByType msg;
724 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
725 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
726 msg.tunnel_id = htonl (t->tid);
727 msg.type = htonl (t->apps[i]);
728 send_packet (t->mesh, &msg.header, t);
735 * Reconnect callback: tries to reconnect again after a failer previous
737 * @param cls closure (mesh handle)
738 * @param tc task context
741 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
743 struct GNUNET_MESH_Handle *h = cls;
745 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
751 /******************************************************************************/
752 /*********************** RECEIVE HANDLERS ****************************/
753 /******************************************************************************/
756 * Process the new tunnel notification and add it to the tunnels in the handle
758 * @param h The mesh handle
759 * @param msg A message with the details of the new incoming tunnel
762 process_tunnel_created (struct GNUNET_MESH_Handle *h,
763 const struct GNUNET_MESH_TunnelNotification *msg)
765 struct GNUNET_MESH_Tunnel *t;
766 MESH_TunnelNumber tid;
768 tid = ntohl (msg->tunnel_id);
769 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
774 t = create_tunnel (h, tid);
775 t->owner = GNUNET_PEER_intern (&msg->peer);
777 t->peers = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer *));
778 t->peers[0] = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
780 t->peers[0]->connected = 1;
781 t->peers[0]->id = t->owner;
782 GNUNET_PEER_change_rc (t->owner, 1);
785 if (NULL != h->new_tunnel)
787 struct GNUNET_ATS_Information atsi;
791 t->ctx = h->new_tunnel (h->cls, t, &msg->peer, &atsi);
794 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: new incoming tunnel %X\n",
802 * Process the tunnel destroy notification and free associated resources
804 * @param h The mesh handle
805 * @param msg A message with the details of the tunnel being destroyed
808 process_tunnel_destroy (struct GNUNET_MESH_Handle *h,
809 const struct GNUNET_MESH_TunnelMessage *msg)
811 struct GNUNET_MESH_Tunnel *t;
812 MESH_TunnelNumber tid;
814 tid = ntohl (msg->tunnel_id);
815 t = retrieve_tunnel (h, tid);
826 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: tunnel %u destroyed\n", t->tid);
828 destroy_tunnel (t, GNUNET_YES);
834 * Process the new peer event and notify the upper level of it
836 * @param h The mesh handle
837 * @param msg A message with the details of the peer event
840 process_peer_event (struct GNUNET_MESH_Handle *h,
841 const struct GNUNET_MESH_PeerControl *msg)
843 struct GNUNET_MESH_Tunnel *t;
844 struct GNUNET_MESH_Peer *p;
845 struct GNUNET_ATS_Information atsi;
849 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: processig peer event\n");
850 size = ntohs (msg->header.size);
851 if (size != sizeof (struct GNUNET_MESH_PeerControl))
856 t = retrieve_tunnel (h, ntohl (msg->tunnel_id));
862 id = GNUNET_PEER_search (&msg->peer);
863 if ((p = retrieve_peer (t, id)) == NULL)
864 p = add_peer_to_tunnel (t, &msg->peer);
865 if (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD == ntohs (msg->header.type))
867 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: adding peer\n");
868 if (NULL != t->connect_handler)
872 t->connect_handler (t->cls, &msg->peer, &atsi);
878 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: removing peer\n");
879 if (NULL != t->disconnect_handler && p->connected)
881 t->disconnect_handler (t->cls, &msg->peer);
883 remove_peer_from_tunnel (p);
886 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: processing peer event END\n");
891 * Process the incoming data packets
893 * @param h The mesh handle
894 * @param message A message encapsulating the data
897 process_incoming_data (struct GNUNET_MESH_Handle *h,
898 const struct GNUNET_MessageHeader *message)
900 const struct GNUNET_MessageHeader *payload;
901 const struct GNUNET_MESH_MessageHandler *handler;
902 const struct GNUNET_PeerIdentity *peer;
903 struct GNUNET_MESH_Unicast *ucast;
904 struct GNUNET_MESH_Multicast *mcast;
905 struct GNUNET_MESH_ToOrigin *to_orig;
906 struct GNUNET_MESH_Tunnel *t;
910 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Got a data message!\n");
911 type = ntohs (message->type);
914 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
915 ucast = (struct GNUNET_MESH_Unicast *) message;
917 t = retrieve_tunnel (h, ntohl (ucast->tid));
918 payload = (struct GNUNET_MessageHeader *) &ucast[1];
920 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: ucast on tunnel %s [%x]\n",
921 GNUNET_i2s (peer), ntohl (ucast->tid));
923 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
924 mcast = (struct GNUNET_MESH_Multicast *) message;
925 t = retrieve_tunnel (h, ntohl (mcast->tid));
926 payload = (struct GNUNET_MessageHeader *) &mcast[1];
928 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: mcast on tunnel %s [%x]\n",
929 GNUNET_i2s (peer), ntohl (mcast->tid));
931 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
932 to_orig = (struct GNUNET_MESH_ToOrigin *) message;
933 t = retrieve_tunnel (h, ntohl (to_orig->tid));
934 payload = (struct GNUNET_MessageHeader *) &to_orig[1];
935 peer = &to_orig->sender;
936 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: torig on tunnel %s [%x]\n",
937 GNUNET_i2s (peer), ntohl (to_orig->tid));
948 type = ntohs (payload->type);
949 for (i = 0; i < h->n_handlers; i++)
951 handler = &h->message_handlers[i];
952 if (handler->type == type)
954 struct GNUNET_ATS_Information atsi;
959 handler->callback (h->cls, t, &t->ctx, peer, payload, &atsi))
961 LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH: callback caused disconnection\n");
962 GNUNET_MESH_disconnect (h);
968 LOG (GNUNET_ERROR_TYPE_DEBUG,
969 "MESH: callback completed successfully\n");
979 * Function to process all messages received from the service
982 * @param msg message received, NULL on timeout or fatal error
985 msg_received (void *cls, const struct GNUNET_MessageHeader *msg)
987 struct GNUNET_MESH_Handle *h = cls;
994 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: received a message type %hu from MESH\n",
996 switch (ntohs (msg->type))
998 /* Notify of a new incoming tunnel */
999 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE:
1000 process_tunnel_created (h, (struct GNUNET_MESH_TunnelNotification *) msg);
1002 /* Notify of a tunnel disconnection */
1003 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY:
1004 process_tunnel_destroy (h, (struct GNUNET_MESH_TunnelMessage *) msg);
1006 /* Notify of a new peer or a peer disconnect in the tunnel */
1007 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD:
1008 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL:
1009 process_peer_event (h, (struct GNUNET_MESH_PeerControl *) msg);
1011 /* Notify of a new data packet in the tunnel */
1012 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
1013 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
1014 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
1015 process_incoming_data (h, msg);
1017 /* We shouldn't get any other packages, log and ignore */
1019 LOG (GNUNET_ERROR_TYPE_WARNING,
1020 "MESH: unsolicited message form service (type %d)\n",
1023 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: message processed\n");
1024 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1025 GNUNET_TIME_UNIT_FOREVER_REL);
1029 /******************************************************************************/
1030 /************************ SEND FUNCTIONS ****************************/
1031 /******************************************************************************/
1034 * Function called to send a message to the service.
1035 * "buf" will be NULL and "size" zero if the socket was closed for writing in
1038 * @param cls closure, the mesh handle
1039 * @param size number of bytes available in buf
1040 * @param buf where the callee should write the connect message
1041 * @return number of bytes written to buf
1044 send_callback (void *cls, size_t size, void *buf)
1046 struct GNUNET_MESH_Handle *h = cls;
1047 struct GNUNET_MESH_TransmitHandle *th;
1052 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Send packet() Buffer %u\n", size);
1054 if ((0 == size) || (NULL == buf))
1060 while ((NULL != (th = h->th_head)) && (size >= th->size))
1062 if (NULL != th->notify)
1064 if (th->tunnel->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1066 /* traffic to origin */
1067 struct GNUNET_MESH_ToOrigin to;
1068 struct GNUNET_MessageHeader *mh;
1070 GNUNET_assert (size >= th->size);
1071 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (to)];
1072 psize = th->notify (th->notify_cls, size - sizeof (to), mh);
1073 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: to origin, type %u\n",
1077 psize += sizeof (to);
1078 GNUNET_assert (size >= psize);
1079 to.header.size = htons (psize);
1080 to.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
1081 to.tid = htonl (th->tunnel->tid);
1082 memset (&to.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1083 memset (&to.sender, 0, sizeof (struct GNUNET_PeerIdentity));
1084 memcpy (cbuf, &to, sizeof (to));
1087 else if (th->target == 0)
1090 struct GNUNET_MESH_Multicast mc;
1091 struct GNUNET_MessageHeader *mh;
1093 GNUNET_assert (size >= th->size);
1094 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (mc)];
1095 psize = th->notify (th->notify_cls, size - sizeof (mc), mh);
1096 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: multicast, type %u\n",
1100 psize += sizeof (mc);
1101 GNUNET_assert (size >= psize);
1102 mc.header.size = htons (psize);
1103 mc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
1104 mc.tid = htonl (th->tunnel->tid);
1107 memset (&mc.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1108 memcpy (cbuf, &mc, sizeof (mc));
1114 struct GNUNET_MESH_Unicast uc;
1115 struct GNUNET_MessageHeader *mh;
1117 GNUNET_assert (size >= th->size);
1118 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (uc)];
1119 psize = th->notify (th->notify_cls, size - sizeof (uc), mh);
1120 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: unicast, type %u\n",
1124 psize += sizeof (uc);
1125 GNUNET_assert (size >= psize);
1126 uc.header.size = htons (psize);
1127 uc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST);
1128 uc.tid = htonl (th->tunnel->tid);
1129 memset (&uc.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1130 GNUNET_PEER_resolve (th->target, &uc.destination);
1131 memcpy (cbuf, &uc, sizeof (uc));
1137 memcpy (cbuf, &th[1], th->size);
1140 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1141 GNUNET_SCHEDULER_cancel (th->timeout_task);
1142 if (NULL != th->tunnel)
1144 th->tunnel->mesh->npackets--;
1145 th->tunnel->npackets--;
1147 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1153 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: total size: %u\n", tsize);
1154 if (NULL != (th = h->th_head))
1156 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: next size: %u\n", th->size);
1158 GNUNET_CLIENT_notify_transmit_ready (h->client, th->size,
1159 GNUNET_TIME_UNIT_FOREVER_REL,
1160 GNUNET_YES, &send_callback, h);
1162 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Send packet() END\n");
1163 if (GNUNET_NO == h->in_receive)
1165 h->in_receive = GNUNET_YES;
1166 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1167 GNUNET_TIME_UNIT_FOREVER_REL);
1174 * Auxiliary function to send an already constructed packet to the service.
1175 * Takes care of creating a new queue element, copying the message and
1176 * calling the tmt_rdy function if necessary.
1178 * @param h mesh handle
1179 * @param msg message to transmit
1180 * @param tunnel tunnel this send is related to (NULL if N/A)
1183 send_packet (struct GNUNET_MESH_Handle *h,
1184 const struct GNUNET_MessageHeader *msg,
1185 struct GNUNET_MESH_Tunnel *tunnel)
1187 struct GNUNET_MESH_TransmitHandle *th;
1190 msize = ntohs (msg->size);
1191 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle) + msize);
1192 th->priority = UINT32_MAX;
1193 th->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
1195 th->tunnel = tunnel;
1196 memcpy (&th[1], msg, msize);
1197 add_to_queue (h, th);
1201 GNUNET_CLIENT_notify_transmit_ready (h->client, msize,
1202 GNUNET_TIME_UNIT_FOREVER_REL,
1203 GNUNET_YES, &send_callback, h);
1207 /******************************************************************************/
1208 /********************** API CALL DEFINITIONS *************************/
1209 /******************************************************************************/
1212 * Connect to the mesh service.
1214 * @param cfg configuration to use
1215 * @param queue_size size of the data message queue, shared among all tunnels
1216 * (each tunnel is guaranteed to accept at least one message,
1217 * no matter what is the status of other tunnels)
1218 * @param cls closure for the various callbacks that follow
1219 * (including handlers in the handlers array)
1220 * @param new_tunnel function called when an *inbound* tunnel is created
1221 * @param cleaner function called when an *inbound* tunnel is destroyed by the
1222 * remote peer, it is *not* called if GNUNET_MESH_tunnel_destroy
1223 * is called on the tunnel
1224 * @param handlers callbacks for messages we care about, NULL-terminated
1225 * note that the mesh is allowed to drop notifications about
1226 * inbound messages if the client does not process them fast
1227 * enough (for this notification type, a bounded queue is used)
1228 * @param stypes list of the applications that this client claims to provide
1229 * @return handle to the mesh service NULL on error
1230 * (in this case, init is never called)
1232 struct GNUNET_MESH_Handle *
1233 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1234 unsigned int queue_size, void *cls,
1235 GNUNET_MESH_InboundTunnelNotificationHandler new_tunnel,
1236 GNUNET_MESH_TunnelEndHandler cleaner,
1237 const struct GNUNET_MESH_MessageHandler *handlers,
1238 const GNUNET_MESH_ApplicationType *stypes)
1240 struct GNUNET_MESH_Handle *h;
1242 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: GNUNET_MESH_connect()\n");
1243 h = GNUNET_malloc (sizeof (struct GNUNET_MESH_Handle));
1245 h->max_queue_size = queue_size;
1246 h->new_tunnel = new_tunnel;
1247 h->cleaner = cleaner;
1248 h->client = GNUNET_CLIENT_connect ("mesh", cfg);
1249 if (h->client == NULL)
1257 h->applications = stypes;
1258 h->message_handlers = handlers;
1259 h->next_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
1260 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
1262 /* count handlers and apps, calculate size */
1263 for (h->n_applications = 0; stypes[h->n_applications]; h->n_applications++) ;
1264 for (h->n_handlers = 0; handlers[h->n_handlers].type; h->n_handlers++) ;
1266 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: GNUNET_MESH_connect() END\n");
1272 * Disconnect from the mesh service. All tunnels will be destroyed. All tunnel
1273 * disconnect callbacks will be called on any still connected peers, notifying
1274 * about their disconnection. The registered inbound tunnel cleaner will be
1275 * called should any inbound tunnels still exist.
1277 * @param handle connection to mesh to disconnect
1280 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle)
1282 struct GNUNET_MESH_Tunnel *t;
1283 struct GNUNET_MESH_Tunnel *aux;
1284 struct GNUNET_MESH_TransmitHandle *th;
1286 t = handle->tunnels_head;
1290 if (t->tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1294 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: tunnel %X not destroyed\n",
1298 destroy_tunnel (t, GNUNET_YES);
1301 while ( (th = handle->th_head) != NULL)
1303 struct GNUNET_MessageHeader *msg;
1305 /* Make sure it is an allowed packet (everything else should have been
1306 * already canceled).
1308 GNUNET_break (UINT32_MAX == th->priority);
1309 GNUNET_break (NULL == th->notify);
1310 msg = (struct GNUNET_MessageHeader *) &th[1];
1311 switch (ntohs(msg->type))
1313 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT:
1314 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY:
1319 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: unexpected msg %u\n",
1324 GNUNET_CONTAINER_DLL_remove (handle->th_head, handle->th_tail, th);
1328 if (NULL != handle->th)
1330 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
1332 if (NULL != handle->client)
1334 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
1336 GNUNET_free (handle);
1341 * Create a new tunnel (we're initiator and will be allowed to add/remove peers
1342 * and to broadcast).
1344 * @param h mesh handle
1345 * @param tunnel_ctx client's tunnel context to associate with the tunnel
1346 * @param connect_handler function to call when peers are actually connected
1347 * @param disconnect_handler function to call when peers are disconnected
1348 * @param handler_cls closure for connect/disconnect handlers
1350 struct GNUNET_MESH_Tunnel *
1351 GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle *h, void *tunnel_ctx,
1352 GNUNET_MESH_PeerConnectHandler connect_handler,
1353 GNUNET_MESH_PeerDisconnectHandler disconnect_handler,
1356 struct GNUNET_MESH_Tunnel *t;
1357 struct GNUNET_MESH_TunnelMessage msg;
1359 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Creating new tunnel\n");
1360 t = create_tunnel (h, 0);
1361 t->connect_handler = connect_handler;
1362 t->disconnect_handler = disconnect_handler;
1363 t->cls = handler_cls;
1364 t->ctx = tunnel_ctx;
1365 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
1366 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1367 msg.tunnel_id = htonl (t->tid);
1368 send_packet (h, &msg.header, t);
1374 * Destroy an existing tunnel. The existing callback for the tunnel will NOT
1377 * @param tunnel tunnel handle
1380 GNUNET_MESH_tunnel_destroy (struct GNUNET_MESH_Tunnel *tunnel)
1382 struct GNUNET_MESH_Handle *h;
1383 struct GNUNET_MESH_TunnelMessage msg;
1384 struct GNUNET_MESH_TransmitHandle *th;
1386 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Destroying tunnel\n");
1389 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1390 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1391 msg.tunnel_id = htonl (tunnel->tid);
1395 struct GNUNET_MESH_TransmitHandle *aux;
1396 if (th->tunnel == tunnel)
1399 /* FIXME call the handler? */
1400 if (NULL != th->notify)
1401 th->notify (th->notify_cls, 0, NULL);
1402 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1410 destroy_tunnel (tunnel, GNUNET_NO);
1411 send_packet (h, &msg.header, tunnel);
1416 * Request that a peer should be added to the tunnel. The existing
1417 * connect handler will be called ONCE with either success or failure.
1418 * This function should NOT be called again with the same peer before the
1419 * connect handler is called.
1421 * @param tunnel handle to existing tunnel
1422 * @param peer peer to add
1425 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
1426 const struct GNUNET_PeerIdentity *peer)
1428 struct GNUNET_MESH_PeerControl msg;
1429 GNUNET_PEER_Id peer_id;
1432 peer_id = GNUNET_PEER_intern (peer);
1433 for (i = 0; i < tunnel->npeers; i++)
1435 if (tunnel->peers[i]->id == peer_id)
1437 /* Peer already exists in tunnel */
1438 GNUNET_PEER_change_rc (peer_id, -1);
1443 if (NULL == add_peer_to_tunnel (tunnel, peer))
1446 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1447 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
1448 msg.tunnel_id = htonl (tunnel->tid);
1450 send_packet (tunnel->mesh, &msg.header, tunnel);
1457 * Request that a peer should be removed from the tunnel. The existing
1458 * disconnect handler will be called ONCE if we were connected.
1460 * @param tunnel handle to existing tunnel
1461 * @param peer peer to remove
1464 GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
1465 const struct GNUNET_PeerIdentity *peer)
1467 struct GNUNET_MESH_PeerControl msg;
1468 GNUNET_PEER_Id peer_id;
1471 peer_id = GNUNET_PEER_search (peer);
1477 for (i = 0; i < tunnel->npeers; i++)
1478 if (tunnel->peers[i]->id == peer_id)
1480 if (i == tunnel->npeers)
1485 if (NULL != tunnel->disconnect_handler && tunnel->peers[i]->connected == 1)
1486 tunnel->disconnect_handler (tunnel->cls, peer);
1487 GNUNET_PEER_change_rc (peer_id, -1);
1488 GNUNET_free (tunnel->peers[i]);
1489 tunnel->peers[i] = tunnel->peers[tunnel->npeers - 1];
1490 GNUNET_array_grow (tunnel->peers, tunnel->npeers, tunnel->npeers - 1);
1492 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1493 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL);
1494 msg.tunnel_id = htonl (tunnel->tid);
1495 memcpy (&msg.peer, peer, sizeof (struct GNUNET_PeerIdentity));
1496 send_packet (tunnel->mesh, &msg.header, tunnel);
1501 * Request that the mesh should try to connect to a peer supporting the given
1504 * @param tunnel handle to existing tunnel
1505 * @param app_type application type that must be supported by the peer (MESH
1506 * should discover peer in proximity handling this type)
1509 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Tunnel *tunnel,
1510 GNUNET_MESH_ApplicationType app_type)
1512 struct GNUNET_MESH_ConnectPeerByType msg;
1514 GNUNET_array_append (tunnel->apps, tunnel->napps, app_type);
1516 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
1517 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
1518 msg.tunnel_id = htonl (tunnel->tid);
1519 msg.type = htonl (app_type);
1520 send_packet (tunnel->mesh, &msg.header, tunnel);
1525 * Ask the mesh to call "notify" once it is ready to transmit the
1526 * given number of bytes to the specified "target". If we are not yet
1527 * connected to the specified peer, a call to this function will cause
1528 * us to try to establish a connection.
1530 * @param tunnel tunnel to use for transmission
1531 * @param cork is corking allowed for this transmission?
1532 * @param priority how important is the message?
1533 * @param maxdelay how long can the message wait?
1534 * @param target destination for the message,
1535 * NULL for multicast to all tunnel targets
1536 * @param notify_size how many bytes of buffer space does notify want?
1537 * @param notify function to call when buffer space is available;
1538 * will be called with NULL on timeout or if the overall queue
1539 * for this peer is larger than queue_size and this is currently
1540 * the message with the lowest priority
1541 * @param notify_cls closure for notify
1542 * @return non-NULL if the notify callback was queued,
1543 * NULL if we can not even queue the request (insufficient
1544 * memory); if NULL is returned, "notify" will NOT be called.
1546 struct GNUNET_MESH_TransmitHandle *
1547 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Tunnel *tunnel, int cork,
1549 struct GNUNET_TIME_Relative maxdelay,
1550 const struct GNUNET_PeerIdentity *target,
1552 GNUNET_CONNECTION_TransmitReadyNotify notify,
1555 struct GNUNET_MESH_TransmitHandle *th;
1556 struct GNUNET_MESH_TransmitHandle *least_priority_th;
1557 uint32_t least_priority;
1560 GNUNET_assert (NULL != tunnel);
1562 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1563 "mesh: mesh notify transmit ready called\n");
1565 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: target %s\n",
1566 GNUNET_i2s (target));
1568 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: target multicast\n");
1570 GNUNET_assert (NULL != notify);
1571 if (tunnel->mesh->npackets >= tunnel->mesh->max_queue_size &&
1572 tunnel->npackets > 0)
1577 th = tunnel->mesh->th_tail;
1578 least_priority = priority;
1579 least_priority_th = NULL;
1582 if (th->priority < least_priority && th->tunnel->npackets > 1)
1584 least_priority_th = th;
1585 least_priority = th->priority;
1589 if (NULL == least_priority_th)
1591 /* Can't be a control message */
1592 GNUNET_assert (NULL != least_priority_th->notify);
1593 least_priority_th->notify (notify_cls, 0, NULL);
1594 least_priority_th->tunnel->npackets--;
1595 tunnel->mesh->npackets--;
1596 GNUNET_CONTAINER_DLL_remove (tunnel->mesh->th_head, tunnel->mesh->th_tail,
1598 if (GNUNET_SCHEDULER_NO_TASK != least_priority_th->timeout_task)
1599 GNUNET_SCHEDULER_cancel (least_priority_th->timeout_task);
1600 GNUNET_free (least_priority_th);
1603 tunnel->mesh->npackets++;
1604 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle));
1605 th->tunnel = tunnel;
1606 th->priority = priority;
1607 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1608 th->target = GNUNET_PEER_intern (target);
1609 if (tunnel->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1610 overhead = sizeof (struct GNUNET_MESH_ToOrigin);
1611 else if (NULL == target)
1612 overhead = sizeof (struct GNUNET_MESH_Multicast);
1614 overhead = sizeof (struct GNUNET_MESH_Unicast);
1615 th->size = notify_size + overhead;
1616 th->notify = notify;
1617 th->notify_cls = notify_cls;
1618 add_to_queue (tunnel->mesh, th);
1619 if (NULL != tunnel->mesh->th)
1622 GNUNET_CLIENT_notify_transmit_ready (tunnel->mesh->client, th->size,
1623 GNUNET_TIME_UNIT_FOREVER_REL,
1624 GNUNET_YES, &send_callback,
1631 * Cancel the specified transmission-ready notification.
1633 * @param th handle that was returned by "notify_transmit_ready".
1636 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle *th)
1638 struct GNUNET_MESH_Handle *mesh;
1640 mesh = th->tunnel->mesh;
1641 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1642 GNUNET_SCHEDULER_cancel (th->timeout_task);
1643 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
1645 if ((NULL == mesh->th_head) && (NULL != mesh->th))
1647 /* queue empty, no point in asking for transmission */
1648 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
1655 * Transition API for tunnel ctx management
1658 GNUNET_MESH_tunnel_set_data (struct GNUNET_MESH_Tunnel *tunnel, void *data)
1664 * Transition API for tunnel ctx management
1667 GNUNET_MESH_tunnel_get_data (struct GNUNET_MESH_Tunnel *tunnel)
1673 #if 0 /* keep Emacsens' auto-indent happy */