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
32 #include "gnunet_common.h"
33 #include "gnunet_client_lib.h"
34 #include "gnunet_util_lib.h"
35 #include "gnunet_peer_lib.h"
36 #include "gnunet_mesh_service.h"
38 #include "mesh_protocol.h"
40 #define LOG(kind,...) GNUNET_log_from (kind, "mesh-api",__VA_ARGS__)
43 /******************************************************************************/
44 /************************ DATA STRUCTURES ****************************/
45 /******************************************************************************/
48 * Transmission queue to the service
50 struct GNUNET_MESH_TransmitHandle
56 struct GNUNET_MESH_TransmitHandle *next;
61 struct GNUNET_MESH_TransmitHandle *prev;
64 * Tunnel this message is sent on / for (may be NULL for control messages).
66 struct GNUNET_MESH_Tunnel *tunnel;
69 * Callback to obtain the message to transmit, or NULL if we
70 * got the message in 'data'. Notice that messages built
71 * by 'notify' need to be encapsulated with information about
74 GNUNET_CONNECTION_TransmitReadyNotify notify;
77 * Closure for 'notify'
82 * How long is this message valid. Once the timeout has been
83 * reached, the message must no longer be sent. If this
84 * is a message with a 'notify' callback set, the 'notify'
85 * function should be called with 'buf' NULL and size 0.
87 struct GNUNET_TIME_Absolute timeout;
90 * Task triggering a timeout, can be NO_TASK if the timeout is FOREVER.
92 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
95 * Priority of the message. The queue is sorted by priority,
96 * control messages have the maximum priority (UINT32_MAX).
101 * Target of the message, 0 for multicast. This field
102 * is only valid if 'notify' is non-NULL.
104 GNUNET_PEER_Id target;
107 * Size of 'data' -- or the desired size of 'notify' if 'data' is NULL.
114 * Opaque handle to the service.
116 struct GNUNET_MESH_Handle
120 * Handle to the server connection, to send messages later
122 struct GNUNET_CLIENT_Connection *client;
125 * Set of handlers used for processing incoming messages in the tunnels
127 const struct GNUNET_MESH_MessageHandler *message_handlers;
130 * Set of applications that should be claimed to be offered at this node.
131 * Note that this is just informative, the appropiate handlers must be
132 * registered independently and the mapping is up to the developer of the
133 * client application.
135 const GNUNET_MESH_ApplicationType *applications;
138 * Double linked list of the tunnels this client is connected to.
140 struct GNUNET_MESH_Tunnel *tunnels_head;
141 struct GNUNET_MESH_Tunnel *tunnels_tail;
144 * Callback for inbound tunnel creation
146 GNUNET_MESH_InboundTunnelNotificationHandler *new_tunnel;
149 * Callback for inbound tunnel disconnection
151 GNUNET_MESH_TunnelEndHandler *cleaner;
154 * Handle to cancel pending transmissions in case of disconnection
156 struct GNUNET_CLIENT_TransmitHandle *th;
159 * Closure for all the handlers given by the client
164 * Messages to send to the service
166 struct GNUNET_MESH_TransmitHandle *th_head;
167 struct GNUNET_MESH_TransmitHandle *th_tail;
170 * tid of the next tunnel to create (to avoid reusing IDs often)
172 MESH_TunnelNumber next_tid;
173 unsigned int n_handlers;
174 unsigned int n_applications;
175 unsigned int max_queue_size;
178 * Have we started the task to receive messages from the service
179 * yet? We do this after we send the 'MESH_LOCAL_CONNECT' message.
184 * Number of packets queued
186 unsigned int npackets;
189 * Configuration given by the client, in case of reconnection
191 const struct GNUNET_CONFIGURATION_Handle *cfg;
194 * Time to the next reconnect in case one reconnect fails
196 struct GNUNET_TIME_Relative reconnect_time;
199 * Task for trying to reconnect.
201 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
206 * Description of a peer
208 struct GNUNET_MESH_Peer
211 * ID of the peer in short form
216 * Tunnel this peer belongs to
218 struct GNUNET_MESH_Tunnel *t;
221 * Flag indicating whether service has informed about its connection
229 * Opaque handle to a tunnel.
231 struct GNUNET_MESH_Tunnel
237 struct GNUNET_MESH_Tunnel *next;
238 struct GNUNET_MESH_Tunnel *prev;
241 * Callback to execute when peers connect to the tunnel
243 GNUNET_MESH_PeerConnectHandler connect_handler;
246 * Callback to execute when peers disconnect from the tunnel
248 GNUNET_MESH_PeerDisconnectHandler disconnect_handler;
251 * Closure for the connect/disconnect handlers
256 * Handle to the mesh this tunnel belongs to
258 struct GNUNET_MESH_Handle *mesh;
261 * Local ID of the tunnel
263 MESH_TunnelNumber tid;
266 * Owner of the tunnel. 0 if the tunnel is the local client.
268 GNUNET_PEER_Id owner;
271 * All peers added to the tunnel
273 struct GNUNET_MESH_Peer **peers;
276 * List of application types that have been requested for this tunnel
278 GNUNET_MESH_ApplicationType *apps;
281 * Any data the caller wants to put in here
286 * Number of peers added to the tunnel
291 * Number of packets queued in this tunnel
293 unsigned int npackets;
296 * Number of applications requested this tunnel
303 /******************************************************************************/
304 /*********************** AUXILIARY FUNCTIONS *************************/
305 /******************************************************************************/
308 * Get the tunnel handler for the tunnel specified by id from the given handle
309 * @param h Mesh handle
310 * @param tid ID of the wanted tunnel
311 * @return handle to the required tunnel or NULL if not found
313 static struct GNUNET_MESH_Tunnel *
314 retrieve_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid)
316 struct GNUNET_MESH_Tunnel *t;
330 * Create a new tunnel and insert it in the tunnel list of the mesh handle
331 * @param h Mesh handle
332 * @param tid desired tid of the tunnel, 0 to assign one automatically
333 * @return handle to the created tunnel
335 static struct GNUNET_MESH_Tunnel *
336 create_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid)
338 struct GNUNET_MESH_Tunnel *t;
340 t = GNUNET_malloc (sizeof (struct GNUNET_MESH_Tunnel));
341 GNUNET_CONTAINER_DLL_insert (h->tunnels_head, h->tunnels_tail, t);
345 t->tid = h->next_tid;
346 while (NULL != retrieve_tunnel (h, h->next_tid))
349 h->next_tid &= ~GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
350 h->next_tid |= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
362 * Destroy the specified tunnel.
363 * - Destroys all peers, calling the disconnect callback on each if needed
364 * - Cancels all outgoing traffic for that tunnel, calling respective notifys
365 * - Calls cleaner if tunnel was inbound
366 * - Frees all memory used
368 * @param t Pointer to the tunnel.
369 * @param call_cleaner Whether to call the cleaner handler.
371 * @return Handle to the required tunnel or NULL if not found.
374 destroy_tunnel (struct GNUNET_MESH_Tunnel *t, int call_cleaner)
376 struct GNUNET_MESH_Handle *h;
377 struct GNUNET_PeerIdentity pi;
378 struct GNUNET_MESH_TransmitHandle *th;
379 struct GNUNET_MESH_TransmitHandle *next;
389 /* disconnect all peers */
390 GNUNET_CONTAINER_DLL_remove (h->tunnels_head, h->tunnels_tail, t);
391 for (i = 0; i < t->npeers; i++)
393 if ( (NULL != t->disconnect_handler) && t->peers[i]->connected)
395 GNUNET_PEER_resolve (t->peers[i]->id, &pi);
396 t->disconnect_handler (t->cls, &pi);
398 GNUNET_PEER_change_rc (t->peers[i]->id, -1);
399 GNUNET_free (t->peers[i]);
402 /* signal tunnel destruction */
403 if ( (NULL != h->cleaner) && (0 != t->owner) && (GNUNET_YES == call_cleaner) )
404 h->cleaner (h->cls, t, t->ctx);
406 /* check that clients did not leave messages behind in the queue */
407 for (th = h->th_head; NULL != th; th = next)
412 /* Clients should have aborted their requests already.
413 * Management traffic should be ok, as clients can't cancel that */
414 GNUNET_break (NULL == th->notify);
415 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
417 /* clean up request */
418 if (GNUNET_SCHEDULER_NO_TASK != th->timeout_task)
419 GNUNET_SCHEDULER_cancel (th->timeout_task);
423 /* if there are no more pending requests with mesh service, cancel active request */
424 /* Note: this should be unnecessary... */
425 if ( (NULL == h->th_head) && (NULL != h->th))
427 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
433 GNUNET_free (t->peers);
435 GNUNET_PEER_change_rc (t->owner, -1);
436 if (0 != t->napps && t->apps)
437 GNUNET_free (t->apps);
444 * Get the peer descriptor for the peer with id from the given tunnel
445 * @param t Tunnel handle
446 * @param id Short form ID of the wanted peer
447 * @return handle to the requested peer or NULL if not found
449 static struct GNUNET_MESH_Peer *
450 retrieve_peer (struct GNUNET_MESH_Tunnel *t, GNUNET_PEER_Id id)
454 for (i = 0; i < t->npeers; i++)
455 if (t->peers[i]->id == id)
462 * Add a peer into a tunnel
463 * @param t Tunnel handle
464 * @param pi Full ID of the new peer
465 * @return handle to the newly created peer
467 static struct GNUNET_MESH_Peer *
468 add_peer_to_tunnel (struct GNUNET_MESH_Tunnel *t,
469 const struct GNUNET_PeerIdentity *pi)
471 struct GNUNET_MESH_Peer *p;
479 id = GNUNET_PEER_intern (pi);
481 p = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
484 GNUNET_array_append (t->peers, t->npeers, p);
490 * Remove a peer from a tunnel
491 * @param p Peer handle
494 remove_peer_from_tunnel (struct GNUNET_MESH_Peer *p)
498 for (i = 0; i < p->t->npeers; i++)
500 if (p->t->peers[i] == p)
503 if (i == p->t->npeers)
508 p->t->peers[i] = p->t->peers[p->t->npeers - 1];
509 GNUNET_array_grow (p->t->peers, p->t->npeers, p->t->npeers - 1);
514 * Notify client that the transmission has timed out
516 * @param tc task context
519 timeout_transmission (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
521 struct GNUNET_MESH_TransmitHandle *th = cls;
522 struct GNUNET_MESH_Handle *mesh;
524 mesh = th->tunnel->mesh;
525 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
526 if (th->notify != NULL)
527 th->notify (th->notify_cls, 0, NULL);
529 if ((NULL == mesh->th_head) && (NULL != mesh->th))
531 /* queue empty, no point in asking for transmission */
532 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
539 * Add a transmit handle to the transmission queue by priority and set the
542 * @param h mesh handle with the queue head and tail
543 * @param th handle to the packet to be transmitted
546 add_to_queue (struct GNUNET_MESH_Handle *h,
547 struct GNUNET_MESH_TransmitHandle *th)
549 struct GNUNET_MESH_TransmitHandle *p;
552 while ((NULL != p) && (th->priority <= p->priority))
558 GNUNET_CONTAINER_DLL_insert_after (h->th_head, h->th_tail, p, th);
559 if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value == th->timeout.abs_value)
562 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
563 (th->timeout), &timeout_transmission, th);
568 * Auxiliary function to send an already constructed packet to the service.
569 * Takes care of creating a new queue element, copying the message and
570 * calling the tmt_rdy function if necessary.
572 * @param h mesh handle
573 * @param msg message to transmit
574 * @param tunnel tunnel this send is related to (NULL if N/A)
577 send_packet (struct GNUNET_MESH_Handle *h,
578 const struct GNUNET_MessageHeader *msg,
579 struct GNUNET_MESH_Tunnel *tunnel);
583 * Reconnect callback: tries to reconnect again after a failer previous
585 * @param cls closure (mesh handle)
586 * @param tc task context
589 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
593 * Send a connect packet to the service with the applications and types
594 * requested by the user.
596 * @param h The mesh handle.
600 send_connect (struct GNUNET_MESH_Handle *h)
604 size = sizeof (struct GNUNET_MESH_ClientConnect);
605 size += h->n_applications * sizeof (GNUNET_MESH_ApplicationType);
606 size += h->n_handlers * sizeof (uint16_t);
608 char buf[size] GNUNET_ALIGN;
609 struct GNUNET_MESH_ClientConnect *msg;
610 GNUNET_MESH_ApplicationType *apps;
615 /* build connection packet */
616 msg = (struct GNUNET_MESH_ClientConnect *) buf;
617 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT);
618 msg->header.size = htons (size);
619 apps = (GNUNET_MESH_ApplicationType *) &msg[1];
620 for (napps = 0; napps < h->n_applications; napps++)
622 apps[napps] = htonl (h->applications[napps]);
623 LOG (GNUNET_ERROR_TYPE_DEBUG, " app %u\n", h->applications[napps]);
625 types = (uint16_t *) & apps[napps];
626 for (ntypes = 0; ntypes < h->n_handlers; ntypes++)
627 types[ntypes] = htons (h->message_handlers[ntypes].type);
628 msg->applications = htons (napps);
629 msg->types = htons (ntypes);
630 LOG (GNUNET_ERROR_TYPE_DEBUG,
631 "Sending %lu bytes long message %d types and %d apps\n",
632 ntohs (msg->header.size), ntypes, napps);
633 send_packet (h, &msg->header, NULL);
639 * Reconnect to the service, retransmit all infomation to try to restore the
642 * @param h handle to the mesh
644 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
647 do_reconnect (struct GNUNET_MESH_Handle *h)
649 struct GNUNET_MESH_Tunnel *t;
652 LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n");
653 LOG (GNUNET_ERROR_TYPE_DEBUG, "******* RECONNECT *******\n");
654 LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n");
656 h->in_receive = GNUNET_NO;
660 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
663 if (NULL != h->client)
665 GNUNET_CLIENT_disconnect (h->client);
669 h->client = GNUNET_CLIENT_connect ("mesh", h->cfg);
670 if (h->client == NULL)
672 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->reconnect_time,
675 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
676 GNUNET_TIME_relative_multiply
677 (h->reconnect_time, 2));
678 LOG (GNUNET_ERROR_TYPE_DEBUG, " Next retry in %sms\n",
679 GNUNET_TIME_relative_to_string (h->reconnect_time));
685 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
688 /* Rebuild all tunnels */
689 for (t = h->tunnels_head; NULL != t; t = t->next)
691 struct GNUNET_MESH_TunnelMessage tmsg;
692 struct GNUNET_MESH_PeerControl pmsg;
694 if (t->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
696 /* Tunnel was created by service (incoming tunnel) */
697 /* TODO: Notify service of missing tunnel, to request
698 * creator to recreate path (find a path to him via DHT?)
702 tmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
703 tmsg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
704 tmsg.tunnel_id = htonl (t->tid);
705 send_packet (h, &tmsg.header, t);
707 pmsg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
708 pmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
709 pmsg.tunnel_id = htonl (t->tid);
711 /* Reconnect all peers */
712 for (i = 0; i < t->npeers; i++)
714 GNUNET_PEER_resolve (t->peers[i]->id, &pmsg.peer);
715 if (NULL != t->disconnect_handler && t->peers[i]->connected)
716 t->disconnect_handler (t->cls, &pmsg.peer);
717 /* If the tunnel was "by type", dont connect individual peers */
719 send_packet (t->mesh, &pmsg.header, t);
721 /* Reconnect all types, if any */
722 for (i = 0; i < t->napps; i++)
724 struct GNUNET_MESH_ConnectPeerByType msg;
726 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
727 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
728 msg.tunnel_id = htonl (t->tid);
729 msg.type = htonl (t->apps[i]);
730 send_packet (t->mesh, &msg.header, t);
737 * Reconnect callback: tries to reconnect again after a failer previous
739 * @param cls closure (mesh handle)
740 * @param tc task context
743 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
745 struct GNUNET_MESH_Handle *h = cls;
747 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
748 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
755 * Reconnect to the service, retransmit all infomation to try to restore the
758 * @param h handle to the mesh
760 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
763 reconnect (struct GNUNET_MESH_Handle *h)
765 LOG (GNUNET_ERROR_TYPE_DEBUG, "Requested RECONNECT\n");
766 if (GNUNET_SCHEDULER_NO_TASK == h->reconnect_task)
767 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->reconnect_time,
772 /******************************************************************************/
773 /*********************** RECEIVE HANDLERS ****************************/
774 /******************************************************************************/
777 * Process the new tunnel notification and add it to the tunnels in the handle
779 * @param h The mesh handle
780 * @param msg A message with the details of the new incoming tunnel
783 process_tunnel_created (struct GNUNET_MESH_Handle *h,
784 const struct GNUNET_MESH_TunnelNotification *msg)
786 struct GNUNET_MESH_Tunnel *t;
787 MESH_TunnelNumber tid;
789 tid = ntohl (msg->tunnel_id);
790 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
795 if (NULL != h->new_tunnel)
797 struct GNUNET_ATS_Information atsi;
799 t = create_tunnel (h, tid);
800 t->owner = GNUNET_PEER_intern (&msg->peer);
802 t->peers = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer *));
803 t->peers[0] = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
805 t->peers[0]->connected = 1;
806 t->peers[0]->id = t->owner;
807 GNUNET_PEER_change_rc (t->owner, 1);
812 t->ctx = h->new_tunnel (h->cls, t, &msg->peer, &atsi);
813 LOG (GNUNET_ERROR_TYPE_DEBUG, "new incoming tunnel %X\n", t->tid);
817 struct GNUNET_MESH_TunnelMessage d_msg;
819 LOG (GNUNET_ERROR_TYPE_DEBUG, "No handler for incoming tunnels\n");
821 d_msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
822 d_msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
823 d_msg.tunnel_id = msg->tunnel_id;
825 send_packet (h, &d_msg.header, NULL);
832 * Process the tunnel destroy notification and free associated resources
834 * @param h The mesh handle
835 * @param msg A message with the details of the tunnel being destroyed
838 process_tunnel_destroy (struct GNUNET_MESH_Handle *h,
839 const struct GNUNET_MESH_TunnelMessage *msg)
841 struct GNUNET_MESH_Tunnel *t;
842 MESH_TunnelNumber tid;
844 tid = ntohl (msg->tunnel_id);
845 t = retrieve_tunnel (h, tid);
855 LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel %X destroyed\n", t->tid);
856 destroy_tunnel (t, GNUNET_YES);
862 * Process the new peer event and notify the upper level of it
864 * @param h The mesh handle
865 * @param msg A message with the details of the peer event
868 process_peer_event (struct GNUNET_MESH_Handle *h,
869 const struct GNUNET_MESH_PeerControl *msg)
871 struct GNUNET_MESH_Tunnel *t;
872 struct GNUNET_MESH_Peer *p;
873 struct GNUNET_ATS_Information atsi;
877 LOG (GNUNET_ERROR_TYPE_DEBUG, "processig peer event\n");
878 size = ntohs (msg->header.size);
879 if (size != sizeof (struct GNUNET_MESH_PeerControl))
884 t = retrieve_tunnel (h, ntohl (msg->tunnel_id));
890 id = GNUNET_PEER_search (&msg->peer);
891 if ((p = retrieve_peer (t, id)) == NULL)
892 p = add_peer_to_tunnel (t, &msg->peer);
893 if (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD == ntohs (msg->header.type))
895 LOG (GNUNET_ERROR_TYPE_DEBUG, "adding peer\n");
896 if (NULL != t->connect_handler)
900 t->connect_handler (t->cls, &msg->peer, &atsi);
906 LOG (GNUNET_ERROR_TYPE_DEBUG, "removing peer\n");
907 if (NULL != t->disconnect_handler && p->connected)
909 t->disconnect_handler (t->cls, &msg->peer);
911 remove_peer_from_tunnel (p);
914 LOG (GNUNET_ERROR_TYPE_DEBUG, "processing peer event END\n");
919 * Process the incoming data packets
921 * @param h The mesh handle
922 * @param message A message encapsulating the data
924 * @return GNUNET_YES if everything went fine
925 * GNUNET_NO if client closed connection (h no longer valid)
928 process_incoming_data (struct GNUNET_MESH_Handle *h,
929 const struct GNUNET_MessageHeader *message)
931 const struct GNUNET_MessageHeader *payload;
932 const struct GNUNET_MESH_MessageHandler *handler;
933 const struct GNUNET_PeerIdentity *peer;
934 struct GNUNET_MESH_Unicast *ucast;
935 struct GNUNET_MESH_Multicast *mcast;
936 struct GNUNET_MESH_ToOrigin *to_orig;
937 struct GNUNET_MESH_Tunnel *t;
941 LOG (GNUNET_ERROR_TYPE_DEBUG, "Got a data message!\n");
942 type = ntohs (message->type);
945 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
946 ucast = (struct GNUNET_MESH_Unicast *) message;
948 t = retrieve_tunnel (h, ntohl (ucast->tid));
949 payload = (struct GNUNET_MessageHeader *) &ucast[1];
951 LOG (GNUNET_ERROR_TYPE_DEBUG, " ucast on tunnel %s [%x]\n",
952 GNUNET_i2s (peer), ntohl (ucast->tid));
954 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
955 mcast = (struct GNUNET_MESH_Multicast *) message;
956 t = retrieve_tunnel (h, ntohl (mcast->tid));
957 payload = (struct GNUNET_MessageHeader *) &mcast[1];
959 LOG (GNUNET_ERROR_TYPE_DEBUG, " mcast on tunnel %s [%x]\n",
960 GNUNET_i2s (peer), ntohl (mcast->tid));
962 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
963 to_orig = (struct GNUNET_MESH_ToOrigin *) message;
964 t = retrieve_tunnel (h, ntohl (to_orig->tid));
965 payload = (struct GNUNET_MessageHeader *) &to_orig[1];
966 peer = &to_orig->sender;
967 LOG (GNUNET_ERROR_TYPE_DEBUG, " torig on tunnel %s [%x]\n",
968 GNUNET_i2s (peer), ntohl (to_orig->tid));
976 /* Tunnel was ignored, probably service didn't get it yet */
979 type = ntohs (payload->type);
980 for (i = 0; i < h->n_handlers; i++)
982 handler = &h->message_handlers[i];
983 if (handler->type == type)
985 struct GNUNET_ATS_Information atsi;
990 handler->callback (h->cls, t, &t->ctx, peer, payload, &atsi))
992 LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH: callback caused disconnection\n");
993 GNUNET_MESH_disconnect (h);
998 LOG (GNUNET_ERROR_TYPE_DEBUG,
999 "MESH: callback completed successfully\n");
1009 * Function to process all messages received from the service
1011 * @param cls closure
1012 * @param msg message received, NULL on timeout or fatal error
1015 msg_received (void *cls, const struct GNUNET_MessageHeader *msg)
1017 struct GNUNET_MESH_Handle *h = cls;
1021 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received NULL msg\n");
1025 LOG (GNUNET_ERROR_TYPE_DEBUG, "received a message type %hu from MESH\n",
1027 switch (ntohs (msg->type))
1029 /* Notify of a new incoming tunnel */
1030 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE:
1031 process_tunnel_created (h, (struct GNUNET_MESH_TunnelNotification *) msg);
1033 /* Notify of a tunnel disconnection */
1034 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY:
1035 process_tunnel_destroy (h, (struct GNUNET_MESH_TunnelMessage *) msg);
1037 /* Notify of a new peer or a peer disconnect in the tunnel */
1038 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD:
1039 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL:
1040 process_peer_event (h, (struct GNUNET_MESH_PeerControl *) msg);
1042 /* Notify of a new data packet in the tunnel */
1043 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
1044 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
1045 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
1046 if (GNUNET_NO == process_incoming_data (h, msg))
1049 /* We shouldn't get any other packages, log and ignore */
1051 LOG (GNUNET_ERROR_TYPE_WARNING,
1052 "MESH: unsolicited message form service (type %d)\n",
1055 LOG (GNUNET_ERROR_TYPE_DEBUG, "message processed\n");
1056 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1057 GNUNET_TIME_UNIT_FOREVER_REL);
1061 /******************************************************************************/
1062 /************************ SEND FUNCTIONS ****************************/
1063 /******************************************************************************/
1066 * Function called to send a message to the service.
1067 * "buf" will be NULL and "size" zero if the socket was closed for writing in
1070 * @param cls closure, the mesh handle
1071 * @param size number of bytes available in buf
1072 * @param buf where the callee should write the connect message
1073 * @return number of bytes written to buf
1076 send_callback (void *cls, size_t size, void *buf)
1078 struct GNUNET_MESH_Handle *h = cls;
1079 struct GNUNET_MESH_TransmitHandle *th;
1084 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send packet() Buffer %u\n", size);
1086 if ((0 == size) || (NULL == buf))
1088 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received NULL callback\n");
1093 while ((NULL != (th = h->th_head)) && (size >= th->size))
1095 if (NULL != th->notify)
1097 if (th->tunnel->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1099 /* traffic to origin */
1100 struct GNUNET_MESH_ToOrigin to;
1101 struct GNUNET_MessageHeader *mh;
1103 GNUNET_assert (size >= th->size);
1104 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (to)];
1105 psize = th->notify (th->notify_cls, size - sizeof (to), mh);
1106 LOG (GNUNET_ERROR_TYPE_DEBUG, " to origin, type %u\n",
1110 psize += sizeof (to);
1111 GNUNET_assert (size >= psize);
1112 to.header.size = htons (psize);
1113 to.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
1114 to.tid = htonl (th->tunnel->tid);
1115 memset (&to.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1116 memset (&to.sender, 0, sizeof (struct GNUNET_PeerIdentity));
1117 memcpy (cbuf, &to, sizeof (to));
1120 else if (th->target == 0)
1123 struct GNUNET_MESH_Multicast mc;
1124 struct GNUNET_MessageHeader *mh;
1126 GNUNET_assert (size >= th->size);
1127 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (mc)];
1128 psize = th->notify (th->notify_cls, size - sizeof (mc), mh);
1129 LOG (GNUNET_ERROR_TYPE_DEBUG, " multicast, type %u\n",
1133 psize += sizeof (mc);
1134 GNUNET_assert (size >= psize);
1135 mc.header.size = htons (psize);
1136 mc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
1137 mc.tid = htonl (th->tunnel->tid);
1140 memset (&mc.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1141 memcpy (cbuf, &mc, sizeof (mc));
1147 struct GNUNET_MESH_Unicast uc;
1148 struct GNUNET_MessageHeader *mh;
1150 GNUNET_assert (size >= th->size);
1151 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (uc)];
1152 psize = th->notify (th->notify_cls, size - sizeof (uc), mh);
1153 LOG (GNUNET_ERROR_TYPE_DEBUG, " unicast, type %u\n",
1157 psize += sizeof (uc);
1158 GNUNET_assert (size >= psize);
1159 uc.header.size = htons (psize);
1160 uc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST);
1161 uc.tid = htonl (th->tunnel->tid);
1162 memset (&uc.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1163 GNUNET_PEER_resolve (th->target, &uc.destination);
1164 memcpy (cbuf, &uc, sizeof (uc));
1170 memcpy (cbuf, &th[1], th->size);
1173 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1174 GNUNET_SCHEDULER_cancel (th->timeout_task);
1175 if (NULL != th->notify)
1177 th->tunnel->mesh->npackets--;
1178 th->tunnel->npackets--;
1180 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1186 LOG (GNUNET_ERROR_TYPE_DEBUG, " total size: %u\n", tsize);
1187 if (NULL != (th = h->th_head))
1189 LOG (GNUNET_ERROR_TYPE_DEBUG, " next size: %u\n", th->size);
1192 GNUNET_CLIENT_notify_transmit_ready (h->client, th->size,
1193 GNUNET_TIME_UNIT_FOREVER_REL,
1194 GNUNET_YES, &send_callback, h);
1196 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send packet() END\n");
1197 if (GNUNET_NO == h->in_receive)
1199 h->in_receive = GNUNET_YES;
1200 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1201 GNUNET_TIME_UNIT_FOREVER_REL);
1208 * Auxiliary function to send an already constructed packet to the service.
1209 * Takes care of creating a new queue element, copying the message and
1210 * calling the tmt_rdy function if necessary.
1212 * @param h mesh handle
1213 * @param msg message to transmit
1214 * @param tunnel tunnel this send is related to (NULL if N/A)
1217 send_packet (struct GNUNET_MESH_Handle *h,
1218 const struct GNUNET_MessageHeader *msg,
1219 struct GNUNET_MESH_Tunnel *tunnel)
1221 struct GNUNET_MESH_TransmitHandle *th;
1224 msize = ntohs (msg->size);
1225 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle) + msize);
1226 th->priority = UINT32_MAX;
1227 th->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
1229 th->tunnel = tunnel;
1230 memcpy (&th[1], msg, msize);
1231 add_to_queue (h, th);
1235 GNUNET_CLIENT_notify_transmit_ready (h->client, msize,
1236 GNUNET_TIME_UNIT_FOREVER_REL,
1237 GNUNET_YES, &send_callback, h);
1241 /******************************************************************************/
1242 /********************** API CALL DEFINITIONS *************************/
1243 /******************************************************************************/
1246 * Connect to the mesh service.
1248 * @param cfg configuration to use
1249 * @param queue_size size of the data message queue, shared among all tunnels
1250 * (each tunnel is guaranteed to accept at least one message,
1251 * no matter what is the status of other tunnels)
1252 * @param cls closure for the various callbacks that follow
1253 * (including handlers in the handlers array)
1254 * @param new_tunnel function called when an *inbound* tunnel is created
1255 * @param cleaner function called when an *inbound* tunnel is destroyed by the
1256 * remote peer, it is *not* called if GNUNET_MESH_tunnel_destroy
1257 * is called on the tunnel
1258 * @param handlers callbacks for messages we care about, NULL-terminated
1259 * note that the mesh is allowed to drop notifications about
1260 * inbound messages if the client does not process them fast
1261 * enough (for this notification type, a bounded queue is used)
1262 * @param stypes list of the applications that this client claims to provide
1263 * @return handle to the mesh service NULL on error
1264 * (in this case, init is never called)
1266 struct GNUNET_MESH_Handle *
1267 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1268 unsigned int queue_size, void *cls,
1269 GNUNET_MESH_InboundTunnelNotificationHandler new_tunnel,
1270 GNUNET_MESH_TunnelEndHandler cleaner,
1271 const struct GNUNET_MESH_MessageHandler *handlers,
1272 const GNUNET_MESH_ApplicationType *stypes)
1274 struct GNUNET_MESH_Handle *h;
1276 LOG (GNUNET_ERROR_TYPE_DEBUG, "GNUNET_MESH_connect()\n");
1277 h = GNUNET_malloc (sizeof (struct GNUNET_MESH_Handle));
1279 h->max_queue_size = queue_size;
1280 h->new_tunnel = new_tunnel;
1281 h->cleaner = cleaner;
1282 h->client = GNUNET_CLIENT_connect ("mesh", cfg);
1283 if (h->client == NULL)
1291 h->applications = stypes;
1292 h->message_handlers = handlers;
1293 h->next_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
1294 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
1295 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1297 /* count handlers and apps, calculate size */
1298 for (h->n_applications = 0; stypes[h->n_applications]; h->n_applications++) ;
1299 for (h->n_handlers = 0; handlers[h->n_handlers].type; h->n_handlers++) ;
1301 LOG (GNUNET_ERROR_TYPE_DEBUG, "GNUNET_MESH_connect() END\n");
1307 * Disconnect from the mesh service. All tunnels will be destroyed. All tunnel
1308 * disconnect callbacks will be called on any still connected peers, notifying
1309 * about their disconnection. The registered inbound tunnel cleaner will be
1310 * called should any inbound tunnels still exist.
1312 * @param handle connection to mesh to disconnect
1315 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle)
1317 struct GNUNET_MESH_Tunnel *t;
1318 struct GNUNET_MESH_Tunnel *aux;
1319 struct GNUNET_MESH_TransmitHandle *th;
1321 t = handle->tunnels_head;
1325 if (t->tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1328 LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel %X not destroyed\n", t->tid);
1330 destroy_tunnel (t, GNUNET_YES);
1333 while ( (th = handle->th_head) != NULL)
1335 struct GNUNET_MessageHeader *msg;
1337 /* Make sure it is an allowed packet (everything else should have been
1338 * already canceled).
1340 GNUNET_break (UINT32_MAX == th->priority);
1341 GNUNET_break (NULL == th->notify);
1342 msg = (struct GNUNET_MessageHeader *) &th[1];
1343 switch (ntohs(msg->type))
1345 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT:
1346 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY:
1350 LOG (GNUNET_ERROR_TYPE_DEBUG, "unexpected msg %u\n",
1354 GNUNET_CONTAINER_DLL_remove (handle->th_head, handle->th_tail, th);
1358 if (NULL != handle->th)
1360 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
1363 if (NULL != handle->client)
1365 GNUNET_CLIENT_disconnect (handle->client);
1366 handle->client = NULL;
1368 if (GNUNET_SCHEDULER_NO_TASK != handle->reconnect_task)
1370 GNUNET_SCHEDULER_cancel(handle->reconnect_task);
1371 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1373 GNUNET_free (handle);
1378 * Create a new tunnel (we're initiator and will be allowed to add/remove peers
1379 * and to broadcast).
1381 * @param h mesh handle
1382 * @param tunnel_ctx client's tunnel context to associate with the tunnel
1383 * @param connect_handler function to call when peers are actually connected
1384 * @param disconnect_handler function to call when peers are disconnected
1385 * @param handler_cls closure for connect/disconnect handlers
1387 struct GNUNET_MESH_Tunnel *
1388 GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle *h, void *tunnel_ctx,
1389 GNUNET_MESH_PeerConnectHandler connect_handler,
1390 GNUNET_MESH_PeerDisconnectHandler disconnect_handler,
1393 struct GNUNET_MESH_Tunnel *t;
1394 struct GNUNET_MESH_TunnelMessage msg;
1396 LOG (GNUNET_ERROR_TYPE_DEBUG, "Creating new tunnel\n");
1397 t = create_tunnel (h, 0);
1398 t->connect_handler = connect_handler;
1399 t->disconnect_handler = disconnect_handler;
1400 t->cls = handler_cls;
1401 t->ctx = tunnel_ctx;
1402 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
1403 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1404 msg.tunnel_id = htonl (t->tid);
1405 send_packet (h, &msg.header, t);
1411 * Destroy an existing tunnel. The existing callback for the tunnel will NOT
1414 * @param tunnel tunnel handle
1417 GNUNET_MESH_tunnel_destroy (struct GNUNET_MESH_Tunnel *tunnel)
1419 struct GNUNET_MESH_Handle *h;
1420 struct GNUNET_MESH_TunnelMessage msg;
1421 struct GNUNET_MESH_TransmitHandle *th;
1423 LOG (GNUNET_ERROR_TYPE_DEBUG, "Destroying tunnel\n");
1426 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1427 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1428 msg.tunnel_id = htonl (tunnel->tid);
1432 struct GNUNET_MESH_TransmitHandle *aux;
1433 if (th->tunnel == tunnel)
1436 /* FIXME call the handler? */
1437 if (NULL != th->notify)
1438 th->notify (th->notify_cls, 0, NULL);
1439 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1447 destroy_tunnel (tunnel, GNUNET_NO);
1448 send_packet (h, &msg.header, NULL);
1453 * Request that a peer should be added to the tunnel. The existing
1454 * connect handler will be called ONCE with either success or failure.
1455 * This function should NOT be called again with the same peer before the
1456 * connect handler is called.
1458 * @param tunnel handle to existing tunnel
1459 * @param peer peer to add
1462 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
1463 const struct GNUNET_PeerIdentity *peer)
1465 struct GNUNET_MESH_PeerControl msg;
1466 GNUNET_PEER_Id peer_id;
1469 peer_id = GNUNET_PEER_intern (peer);
1470 for (i = 0; i < tunnel->npeers; i++)
1472 if (tunnel->peers[i]->id == peer_id)
1474 /* Peer already exists in tunnel */
1475 GNUNET_PEER_change_rc (peer_id, -1);
1480 if (NULL == add_peer_to_tunnel (tunnel, peer))
1483 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1484 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
1485 msg.tunnel_id = htonl (tunnel->tid);
1487 send_packet (tunnel->mesh, &msg.header, tunnel);
1494 * Request that a peer should be removed from the tunnel. The existing
1495 * disconnect handler will be called ONCE if we were connected.
1497 * @param tunnel handle to existing tunnel
1498 * @param peer peer to remove
1501 GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
1502 const struct GNUNET_PeerIdentity *peer)
1504 struct GNUNET_MESH_PeerControl msg;
1505 GNUNET_PEER_Id peer_id;
1508 peer_id = GNUNET_PEER_search (peer);
1514 for (i = 0; i < tunnel->npeers; i++)
1515 if (tunnel->peers[i]->id == peer_id)
1517 if (i == tunnel->npeers)
1522 if (NULL != tunnel->disconnect_handler && tunnel->peers[i]->connected == 1)
1523 tunnel->disconnect_handler (tunnel->cls, peer);
1524 GNUNET_PEER_change_rc (peer_id, -1);
1525 GNUNET_free (tunnel->peers[i]);
1526 tunnel->peers[i] = tunnel->peers[tunnel->npeers - 1];
1527 GNUNET_array_grow (tunnel->peers, tunnel->npeers, tunnel->npeers - 1);
1529 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1530 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL);
1531 msg.tunnel_id = htonl (tunnel->tid);
1532 memcpy (&msg.peer, peer, sizeof (struct GNUNET_PeerIdentity));
1533 send_packet (tunnel->mesh, &msg.header, tunnel);
1538 * Request that the mesh should try to connect to a peer supporting the given
1541 * @param tunnel handle to existing tunnel
1542 * @param app_type application type that must be supported by the peer (MESH
1543 * should discover peer in proximity handling this type)
1546 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Tunnel *tunnel,
1547 GNUNET_MESH_ApplicationType app_type)
1549 struct GNUNET_MESH_ConnectPeerByType msg;
1551 GNUNET_array_append (tunnel->apps, tunnel->napps, app_type);
1553 LOG (GNUNET_ERROR_TYPE_DEBUG, "* CONNECT BY TYPE *\n");
1554 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
1555 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
1556 msg.tunnel_id = htonl (tunnel->tid);
1557 msg.type = htonl (app_type);
1558 send_packet (tunnel->mesh, &msg.header, tunnel);
1563 * Ask the mesh to call "notify" once it is ready to transmit the
1564 * given number of bytes to the specified "target". If we are not yet
1565 * connected to the specified peer, a call to this function will cause
1566 * us to try to establish a connection.
1568 * @param tunnel tunnel to use for transmission
1569 * @param cork is corking allowed for this transmission?
1570 * @param priority how important is the message?
1571 * @param maxdelay how long can the message wait?
1572 * @param target destination for the message,
1573 * NULL for multicast to all tunnel targets
1574 * @param notify_size how many bytes of buffer space does notify want?
1575 * @param notify function to call when buffer space is available;
1576 * will be called with NULL on timeout or if the overall queue
1577 * for this peer is larger than queue_size and this is currently
1578 * the message with the lowest priority
1579 * @param notify_cls closure for notify
1580 * @return non-NULL if the notify callback was queued,
1581 * NULL if we can not even queue the request (insufficient
1582 * memory); if NULL is returned, "notify" will NOT be called.
1584 struct GNUNET_MESH_TransmitHandle *
1585 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Tunnel *tunnel, int cork,
1587 struct GNUNET_TIME_Relative maxdelay,
1588 const struct GNUNET_PeerIdentity *target,
1590 GNUNET_CONNECTION_TransmitReadyNotify notify,
1593 struct GNUNET_MESH_TransmitHandle *th;
1594 struct GNUNET_MESH_TransmitHandle *least_priority_th;
1595 uint32_t least_priority;
1598 GNUNET_assert (NULL != tunnel);
1599 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh notify transmit ready called\n");
1601 LOG (GNUNET_ERROR_TYPE_DEBUG, " target %s\n", GNUNET_i2s (target));
1603 LOG (GNUNET_ERROR_TYPE_DEBUG, " target multicast\n");
1604 GNUNET_assert (NULL != notify);
1605 if (tunnel->mesh->npackets >= tunnel->mesh->max_queue_size &&
1606 tunnel->npackets > 0)
1611 th = tunnel->mesh->th_tail;
1612 least_priority = priority;
1613 least_priority_th = NULL;
1616 if (th->priority < least_priority && th->tunnel->npackets > 1)
1618 least_priority_th = th;
1619 least_priority = th->priority;
1623 if (NULL == least_priority_th)
1625 /* Can't be a control message */
1626 GNUNET_assert (NULL != least_priority_th->notify);
1627 least_priority_th->notify (notify_cls, 0, NULL);
1628 least_priority_th->tunnel->npackets--;
1629 tunnel->mesh->npackets--;
1630 GNUNET_CONTAINER_DLL_remove (tunnel->mesh->th_head, tunnel->mesh->th_tail,
1632 if (GNUNET_SCHEDULER_NO_TASK != least_priority_th->timeout_task)
1633 GNUNET_SCHEDULER_cancel (least_priority_th->timeout_task);
1634 GNUNET_free (least_priority_th);
1637 tunnel->mesh->npackets++;
1638 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle));
1639 th->tunnel = tunnel;
1640 th->priority = priority;
1641 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1642 th->target = GNUNET_PEER_intern (target);
1643 if (tunnel->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1644 overhead = sizeof (struct GNUNET_MESH_ToOrigin);
1645 else if (NULL == target)
1646 overhead = sizeof (struct GNUNET_MESH_Multicast);
1648 overhead = sizeof (struct GNUNET_MESH_Unicast);
1649 th->size = notify_size + overhead;
1650 th->notify = notify;
1651 th->notify_cls = notify_cls;
1652 add_to_queue (tunnel->mesh, th);
1653 if (NULL != tunnel->mesh->th)
1656 GNUNET_CLIENT_notify_transmit_ready (tunnel->mesh->client, th->size,
1657 GNUNET_TIME_UNIT_FOREVER_REL,
1658 GNUNET_YES, &send_callback,
1665 * Cancel the specified transmission-ready notification.
1667 * @param th handle that was returned by "notify_transmit_ready".
1670 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle *th)
1672 struct GNUNET_MESH_Handle *mesh;
1674 mesh = th->tunnel->mesh;
1675 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1676 GNUNET_SCHEDULER_cancel (th->timeout_task);
1677 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
1679 if ((NULL == mesh->th_head) && (NULL != mesh->th))
1681 /* queue empty, no point in asking for transmission */
1682 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
1689 * Transition API for tunnel ctx management
1692 GNUNET_MESH_tunnel_set_data (struct GNUNET_MESH_Tunnel *tunnel, void *data)
1698 * Transition API for tunnel ctx management
1701 GNUNET_MESH_tunnel_get_data (struct GNUNET_MESH_Tunnel *tunnel)