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_connection.c
23 * @brief GNUnet MESH service connection handling
24 * @author Bartlomiej Polot
28 #include "gnunet_util_lib.h"
30 #include "gnunet_statistics_service.h"
32 #include "mesh_path.h"
33 #include "mesh_protocol.h"
35 #include "gnunet-service-mesh_connection.h"
36 #include "gnunet-service-mesh_peer.h"
37 #include "gnunet-service-mesh_tunnel.h"
40 #define LOG(level, ...) GNUNET_log_from (level,"mesh-con",__VA_ARGS__)
42 #define MESH_MAX_POLL_TIME GNUNET_TIME_relative_multiply (\
43 GNUNET_TIME_UNIT_MINUTES,\
48 /******************************************************************************/
49 /******************************** STRUCTS **********************************/
50 /******************************************************************************/
53 * Struct to encapsulate all the Flow Control information to a peer to which
54 * we are directly connected (on a core level).
56 struct MeshFlowControl
59 * Connection this controls.
61 struct MeshConnection *c;
64 * How many messages are in the queue on this connection.
69 * How many messages do we accept in the queue.
71 unsigned int queue_max;
79 * ID of the last packet sent towards the peer.
81 uint32_t last_pid_sent;
84 * ID of the last packet received from the peer.
86 uint32_t last_pid_recv;
89 * Last ACK sent to the peer (peer can't send more than this PID).
91 uint32_t last_ack_sent;
94 * Last ACK sent towards the origin (for traffic towards leaf node).
96 uint32_t last_ack_recv;
99 * Task to poll the peer in case of a lost ACK causes stall.
101 GNUNET_SCHEDULER_TaskIdentifier poll_task;
104 * How frequently to poll for ACKs.
106 struct GNUNET_TIME_Relative poll_time;
109 * Queued poll message, to cancel if not necessary anymore (got ACK).
111 struct MeshConnectionQueue *poll_msg;
114 * Queued poll message, to cancel if not necessary anymore (got ACK).
116 struct MeshConnectionQueue *ack_msg;
120 * Keep a record of the last messages sent on this connection.
122 struct MeshConnectionPerformance
125 * Circular buffer for storing measurements.
127 double usecsperbyte[AVG_MSGS];
130 * Running average of @c usecsperbyte.
135 * How many values of @c usecsperbyte are valid.
140 * Index of the next "free" position in @c usecsperbyte.
147 * Struct containing all information regarding a connection to a peer.
149 struct MeshConnection
152 * Tunnel this connection is part of.
154 struct MeshTunnel3 *t;
157 * Flow control information for traffic fwd.
159 struct MeshFlowControl fwd_fc;
162 * Flow control information for traffic bck.
164 struct MeshFlowControl bck_fc;
167 * Measure connection performance on the endpoint.
169 struct MeshConnectionPerformance *perf;
172 * ID of the connection.
174 struct GNUNET_HashCode id;
177 * State of the connection.
179 enum MeshConnectionState state;
182 * Path being used for the tunnel.
184 struct MeshPeerPath *path;
187 * Position of the local peer in the path.
189 unsigned int own_pos;
192 * Task to keep the used paths alive at the owner,
193 * time tunnel out on all the other peers.
195 GNUNET_SCHEDULER_TaskIdentifier fwd_maintenance_task;
198 * Task to keep the used paths alive at the destination,
199 * time tunnel out on all the other peers.
201 GNUNET_SCHEDULER_TaskIdentifier bck_maintenance_task;
204 * Pending message count.
206 int pending_messages;
209 * Destroy flag: if true, destroy on last message.
215 * Handle for messages queued but not yet sent.
217 struct MeshConnectionQueue
220 * Peer queue handle, to cancel if necessary.
222 struct MeshPeerQueue *q;
225 * Continuation to call once sent.
230 * Closure for @c cont.
235 /******************************************************************************/
236 /******************************* GLOBALS ***********************************/
237 /******************************************************************************/
240 * Global handle to the statistics service.
242 extern struct GNUNET_STATISTICS_Handle *stats;
245 * Local peer own ID (memory efficient handle).
247 extern GNUNET_PEER_Id myid;
250 * Local peer own ID (full value).
252 extern struct GNUNET_PeerIdentity my_full_id;
255 * Connections known, indexed by cid (MeshConnection).
257 static struct GNUNET_CONTAINER_MultiHashMap *connections;
260 * How many connections are we willing to maintain.
261 * Local connections are always allowed, even if there are more connections than max.
263 static unsigned long long max_connections;
266 * How many messages *in total* are we willing to queue, divide by number of
267 * connections to get connection queue size.
269 static unsigned long long max_msgs_queue;
272 * How often to send path keepalives. Paths timeout after 4 missed.
274 static struct GNUNET_TIME_Relative refresh_connection_time;
277 * How often to send path create / ACKs.
279 static struct GNUNET_TIME_Relative create_connection_time;
282 /******************************************************************************/
283 /******************************** STATIC ***********************************/
284 /******************************************************************************/
286 #if 0 // avoid compiler warning for unused static function
288 fc_debug (struct MeshFlowControl *fc)
290 LOG (GNUNET_ERROR_TYPE_DEBUG, " IN: %u/%u\n",
291 fc->last_pid_recv, fc->last_ack_sent);
292 LOG (GNUNET_ERROR_TYPE_DEBUG, " OUT: %u/%u\n",
293 fc->last_pid_sent, fc->last_ack_recv);
294 LOG (GNUNET_ERROR_TYPE_DEBUG, " QUEUE: %u/%u\n",
295 fc->queue_n, fc->queue_max);
299 connection_debug (struct MeshConnection *c)
303 LOG (GNUNET_ERROR_TYPE_DEBUG, "*** DEBUG NULL CONNECTION ***\n");
306 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connection %s:%X\n",
307 peer2s (c->t->peer), GMC_2s (c));
308 LOG (GNUNET_ERROR_TYPE_DEBUG, " state: %u, pending msgs: %u\n",
309 c->state, c->pending_messages);
310 LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD FC\n");
311 fc_debug (&c->fwd_fc);
312 LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK FC\n");
313 fc_debug (&c->bck_fc);
318 * Get string description for tunnel state.
320 * @param s Tunnel state.
322 * @return String representation.
325 GMC_state2s (enum MeshConnectionState s)
329 case MESH_CONNECTION_NEW:
330 return "MESH_CONNECTION_NEW";
331 case MESH_CONNECTION_SENT:
332 return "MESH_CONNECTION_SENT";
333 case MESH_CONNECTION_ACK:
334 return "MESH_CONNECTION_ACK";
335 case MESH_CONNECTION_READY:
336 return "MESH_CONNECTION_READY";
337 case MESH_CONNECTION_DESTROYED:
338 return "MESH_CONNECTION_DESTROYED";
340 return "MESH_CONNECTION_STATE_ERROR";
346 * Initialize a Flow Control structure to the initial state.
348 * @param fc Flow Control structure to initialize.
351 fc_init (struct MeshFlowControl *fc)
354 fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
355 fc->last_pid_recv = (uint32_t) -1;
356 fc->last_ack_sent = (uint32_t) 0;
357 fc->last_ack_recv = (uint32_t) 0;
358 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
359 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
361 fc->queue_max = (max_msgs_queue / max_connections) + 1;
368 * @param cid Connection ID.
370 static struct MeshConnection *
371 connection_get (const struct GNUNET_HashCode *cid)
373 return GNUNET_CONTAINER_multihashmap_get (connections, cid);
378 connection_change_state (struct MeshConnection* c,
379 enum MeshConnectionState state)
381 LOG (GNUNET_ERROR_TYPE_DEBUG,
382 "Connection %s state was %s\n",
383 GMC_2s (c), GMC_state2s (c->state));
384 if (MESH_CONNECTION_DESTROYED == c->state)
386 LOG (GNUNET_ERROR_TYPE_DEBUG, "state not changing anymore\n");
389 LOG (GNUNET_ERROR_TYPE_DEBUG,
390 "Connection %s state is now %s\n",
391 GMC_2s (c), GMC_state2s (state));
397 * Callback called when a queued ACK message is sent.
399 * @param cls Closure (FC).
400 * @param c Connection this message was on.
401 * @param q Queue handler this call invalidates.
402 * @param type Type of message sent.
403 * @param fwd Was this a FWD going message?
404 * @param size Size of the message.
408 struct MeshConnection *c,
409 struct MeshConnectionQueue *q,
410 uint16_t type, int fwd, size_t size)
412 struct MeshFlowControl *fc = cls;
419 * Send an ACK on the connection, informing the predecessor about
420 * the available buffer space. Should not be called in case the peer
421 * is origin (no predecessor) in the @c fwd direction.
423 * Note that for fwd ack, the FWD mean forward *traffic* (root->dest),
424 * the ACK itself goes "back" (dest->root).
426 * @param c Connection on which to send the ACK.
427 * @param buffer How much space free to advertise?
428 * @param fwd Is this FWD ACK? (Going dest -> root)
429 * @param force Don't optimize out.
432 send_ack (struct MeshConnection *c, unsigned int buffer, int fwd, int force)
434 struct MeshFlowControl *next_fc;
435 struct MeshFlowControl *prev_fc;
436 struct GNUNET_MESH_ACK msg;
440 /* If origin, there is no connection to send ACKs. Wrong function! */
441 if (GMC_is_origin (c, fwd))
447 next_fc = fwd ? &c->fwd_fc : &c->bck_fc;
448 prev_fc = fwd ? &c->bck_fc : &c->fwd_fc;
450 LOG (GNUNET_ERROR_TYPE_DEBUG,
451 "connection send %s ack on %s\n",
452 GM_f2s (fwd), GMC_2s (c));
454 /* Check if we need to transmit the ACK. */
455 delta = prev_fc->last_ack_sent - prev_fc->last_pid_recv;
456 if (3 < delta && buffer < delta && GNUNET_NO == force)
458 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer > 3\n");
459 LOG (GNUNET_ERROR_TYPE_DEBUG,
460 " last pid recv: %u, last ack sent: %u\n",
461 prev_fc->last_pid_recv, prev_fc->last_ack_sent);
465 /* Ok, ACK might be necessary, what PID to ACK? */
466 ack = prev_fc->last_pid_recv + buffer;
467 LOG (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
468 LOG (GNUNET_ERROR_TYPE_DEBUG,
469 " last pid %u, last ack %u, qmax %u, q %u\n",
470 prev_fc->last_pid_recv, prev_fc->last_ack_sent,
471 next_fc->queue_max, next_fc->queue_n);
472 if (ack == prev_fc->last_ack_sent && GNUNET_NO == force)
474 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
478 /* Check if message is already in queue */
479 if (NULL != prev_fc->ack_msg)
481 if (GM_is_pid_bigger (ack, prev_fc->last_ack_sent))
483 LOG (GNUNET_ERROR_TYPE_DEBUG, " canceling old ACK\n");
484 GMC_cancel (prev_fc->ack_msg);
485 /* GMC_cancel triggers ack_sent(), which clears fc->ack_msg */
489 LOG (GNUNET_ERROR_TYPE_DEBUG, " same ACK already in queue\n");
494 prev_fc->last_ack_sent = ack;
496 /* Build ACK message and send on connection */
497 msg.header.size = htons (sizeof (msg));
498 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK);
499 msg.ack = htonl (ack);
502 prev_fc->ack_msg = GMC_send_prebuilt_message (&msg.header, c, !fwd,
508 * Callback called when a queued message is sent.
510 * Calculates the average time and connection packet tracking.
512 * @param cls Closure (ConnectionQueue Handle).
513 * @param c Connection this message was on.
514 * @param type Type of message sent.
515 * @param fwd Was this a FWD going message?
516 * @param size Size of the message.
517 * @param wait Time spent waiting for core (only the time for THIS message)
520 message_sent (void *cls,
521 struct MeshConnection *c, uint16_t type,
522 int fwd, size_t size,
523 struct GNUNET_TIME_Relative wait)
525 struct MeshConnectionPerformance *p;
526 struct MeshFlowControl *fc;
527 struct MeshConnectionQueue *q = cls;
530 fc = fwd ? &c->fwd_fc : &c->bck_fc;
531 LOG (GNUNET_ERROR_TYPE_DEBUG,
535 LOG (GNUNET_ERROR_TYPE_DEBUG, "! C_P- %p %u\n", c, c->pending_messages);
540 LOG (GNUNET_ERROR_TYPE_DEBUG, "! calling cont\n");
541 q->cont (q->cont_cls, c, q, type, fwd, size);
545 c->pending_messages--;
546 if (GNUNET_YES == c->destroy && 0 == c->pending_messages)
548 LOG (GNUNET_ERROR_TYPE_DEBUG, "! destroying connection!\n");
552 /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
555 case GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED:
557 LOG (GNUNET_ERROR_TYPE_DEBUG, "! Q_N- %p %u\n", fc, fc->queue_n);
559 LOG (GNUNET_ERROR_TYPE_DEBUG,
560 "! accounting pid %u\n",
562 GMC_send_ack (c, fwd, GNUNET_NO);
565 case GNUNET_MESSAGE_TYPE_MESH_POLL:
569 case GNUNET_MESSAGE_TYPE_MESH_ACK:
576 LOG (GNUNET_ERROR_TYPE_DEBUG, "! message sent!\n");
579 return; /* Only endpoints are interested in timing. */
582 usecsperbyte = ((double) wait.rel_value_us) / size;
583 if (p->size == AVG_MSGS)
585 /* Array is full. Substract oldest value, add new one and store. */
586 p->avg -= (p->usecsperbyte[p->idx] / AVG_MSGS);
587 p->usecsperbyte[p->idx] = usecsperbyte;
588 p->avg += (p->usecsperbyte[p->idx] / AVG_MSGS);
592 /* Array not yet full. Add current value to avg and store. */
593 p->usecsperbyte[p->idx] = usecsperbyte;
595 p->avg += p->usecsperbyte[p->idx];
599 p->idx = (p->idx + 1) % AVG_MSGS;
604 * Get the previous hop in a connection
606 * @param c Connection.
608 * @return Previous peer in the connection.
610 static struct MeshPeer *
611 get_prev_hop (const struct MeshConnection *c)
615 LOG (GNUNET_ERROR_TYPE_DEBUG, "Get prev hop, own pos %u\n", c->own_pos);
616 if (0 == c->own_pos || c->path->length < 2)
617 id = c->path->peers[0];
619 id = c->path->peers[c->own_pos - 1];
621 return GMP_get_short (id);
626 * Get the next hop in a connection
628 * @param c Connection.
630 * @return Next peer in the connection.
632 static struct MeshPeer *
633 get_next_hop (const struct MeshConnection *c)
637 if ((c->path->length - 1) == c->own_pos || c->path->length < 2)
638 id = c->path->peers[c->path->length - 1];
640 id = c->path->peers[c->own_pos + 1];
642 return GMP_get_short (id);
647 * Get the hop in a connection.
649 * @param c Connection.
650 * @param fwd Next hop?
652 * @return Next peer in the connection.
654 static struct MeshPeer *
655 get_hop (struct MeshConnection *c, int fwd)
658 return get_next_hop (c);
659 return get_prev_hop (c);
664 * Is traffic coming from this sender 'FWD' traffic?
666 * @param c Connection to check.
667 * @param sender Peer identity of neighbor.
669 * @return #GNUNET_YES in case the sender is the 'prev' hop and therefore
670 * the traffic is 'FWD'.
671 * #GNUNET_NO for BCK.
672 * #GNUNET_SYSERR for errors.
675 is_fwd (const struct MeshConnection *c,
676 const struct GNUNET_PeerIdentity *sender)
680 id = GNUNET_PEER_search (sender);
681 if (GMP_get_short_id (get_prev_hop (c)) == id)
684 if (GMP_get_short_id (get_next_hop (c)) == id)
688 return GNUNET_SYSERR;
693 * Sends a CONNECTION ACK message in reponse to a received CONNECTION_CREATE
694 * or a first CONNECTION_ACK directed to us.
696 * @param connection Connection to confirm.
697 * @param fwd Should we send it FWD? (root->dest)
698 * (First (~SYNACK) goes BCK, second (~ACK) goes FWD)
701 send_connection_ack (struct MeshConnection *connection, int fwd)
703 struct MeshTunnel3 *t;
706 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send connection %s ACK\n",
708 GMP_queue_add (get_hop (connection, fwd), NULL,
709 GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK,
710 sizeof (struct GNUNET_MESH_ConnectionACK),
711 connection, fwd, &message_sent, NULL);
712 connection->pending_messages++;
713 if (MESH_TUNNEL3_NEW == GMT_get_cstate (t))
714 GMT_change_cstate (t, MESH_TUNNEL3_WAITING);
715 if (MESH_CONNECTION_READY != connection->state)
716 connection_change_state (connection, MESH_CONNECTION_SENT);
721 * Send a notification that a connection is broken.
723 * @param c Connection that is broken.
724 * @param id1 Peer that has disconnected.
725 * @param id2 Peer that has disconnected.
726 * @param fwd Direction towards which to send it.
729 send_broken (struct MeshConnection *c,
730 const struct GNUNET_PeerIdentity *id1,
731 const struct GNUNET_PeerIdentity *id2,
734 struct GNUNET_MESH_ConnectionBroken msg;
736 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectionBroken));
737 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN);
741 GMC_send_prebuilt_message (&msg.header, c, fwd, NULL, NULL);
747 * Send keepalive packets for a connection.
749 * @param c Connection to keep alive..
750 * @param fwd Is this a FWD keepalive? (owner -> dest).
752 * FIXME register in GMC_send_prebuilt_message()
755 connection_keepalive (struct MeshConnection *c, int fwd)
757 struct GNUNET_MESH_ConnectionKeepAlive *msg;
758 size_t size = sizeof (struct GNUNET_MESH_ConnectionKeepAlive);
761 LOG (GNUNET_ERROR_TYPE_DEBUG,
762 "sending %s keepalive for connection %s]\n",
763 GM_f2s (fwd), GMC_2s (c));
765 msg = (struct GNUNET_MESH_ConnectionKeepAlive *) cbuf;
766 msg->header.size = htons (size);
767 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KEEPALIVE);
770 GMC_send_prebuilt_message (&msg->header, c, fwd, NULL, NULL);
775 * Send CONNECTION_{CREATE/ACK} packets for a connection.
777 * @param c Connection for which to send the message.
778 * @param fwd If #GNUNET_YES, send CREATE, otherwise send ACK.
781 connection_recreate (struct MeshConnection *c, int fwd)
783 LOG (GNUNET_ERROR_TYPE_DEBUG, "sending connection recreate\n");
787 send_connection_ack (c, GNUNET_NO);
792 * Generic connection timer management.
793 * Depending on the role of the peer in the connection will send the
794 * appropriate message (build or keepalive)
796 * @param c Conncetion to maintain.
800 connection_maintain (struct MeshConnection *c, int fwd)
802 if (MESH_TUNNEL3_SEARCHING == GMT_get_cstate (c->t))
804 /* TODO DHT GET with RO_BART */
809 case MESH_CONNECTION_NEW:
812 case MESH_CONNECTION_SENT:
813 connection_recreate (c, fwd);
815 case MESH_CONNECTION_READY:
816 connection_keepalive (c, fwd);
825 connection_fwd_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
827 struct MeshConnection *c = cls;
828 struct GNUNET_TIME_Relative delay;
830 c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
831 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
834 connection_maintain (c, GNUNET_YES);
835 delay = c->state == MESH_CONNECTION_READY ?
836 refresh_connection_time : create_connection_time;
837 c->fwd_maintenance_task = GNUNET_SCHEDULER_add_delayed (delay,
838 &connection_fwd_keepalive,
844 connection_bck_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
846 struct MeshConnection *c = cls;
847 struct GNUNET_TIME_Relative delay;
849 c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
850 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
853 connection_maintain (c, GNUNET_NO);
854 delay = c->state == MESH_CONNECTION_READY ?
855 refresh_connection_time : create_connection_time;
856 c->bck_maintenance_task = GNUNET_SCHEDULER_add_delayed (delay,
857 &connection_bck_keepalive,
863 * @brief Re-initiate traffic on this connection if necessary.
865 * Check if there is traffic queued towards this peer
866 * and the core transmit handle is NULL (traffic was stalled).
867 * If so, call core tmt rdy.
869 * @param c Connection on which initiate traffic.
870 * @param fwd Is this about fwd traffic?
873 connection_unlock_queue (struct MeshConnection *c, int fwd)
875 struct MeshPeer *peer;
877 LOG (GNUNET_ERROR_TYPE_DEBUG,
878 "connection_unlock_queue %s on %s\n",
879 GM_f2s (fwd), GMC_2s (c));
881 if (GMC_is_terminal (c, fwd))
883 LOG (GNUNET_ERROR_TYPE_DEBUG, " is terminal!\n");
887 peer = get_hop (c, fwd);
888 GMP_queue_unlock (peer, c);
893 * Cancel all transmissions that belong to a certain connection.
895 * If the connection is scheduled for destruction and no more messages are left,
896 * the connection will be destroyed by the continuation call.
898 * @param c Connection which to cancel. Might be destroyed during this call.
899 * @param fwd Cancel fwd traffic?
902 connection_cancel_queues (struct MeshConnection *c, int fwd)
904 struct MeshFlowControl *fc;
905 struct MeshPeer *peer;
907 LOG (GNUNET_ERROR_TYPE_DEBUG,
908 " *** Cancel %s queues for connection %s\n",
909 GM_f2s (fwd), GMC_2s (c));
916 fc = fwd ? &c->fwd_fc : &c->bck_fc;
917 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
919 GNUNET_SCHEDULER_cancel (fc->poll_task);
920 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
921 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** Cancel POLL in ccq for fc %p\n", fc);
923 peer = get_hop (c, fwd);
924 GMP_queue_cancel (peer, c);
929 * Function called if a connection has been stalled for a while,
930 * possibly due to a missed ACK. Poll the neighbor about its ACK status.
932 * @param cls Closure (poll ctx).
933 * @param tc TaskContext.
936 connection_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
940 * Callback called when a queued POLL message is sent.
942 * @param cls Closure (FC).
943 * @param c Connection this message was on.
944 * @param q Queue handler this call invalidates.
945 * @param type Type of message sent.
946 * @param fwd Was this a FWD going message?
947 * @param size Size of the message.
950 poll_sent (void *cls,
951 struct MeshConnection *c,
952 struct MeshConnectionQueue *q,
953 uint16_t type, int fwd, size_t size)
955 struct MeshFlowControl *fc = cls;
959 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL canceled on shutdown\n");
962 LOG (GNUNET_ERROR_TYPE_DEBUG,
963 " *** POLL sent for , scheduling new one!\n");
965 fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
966 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
967 &connection_poll, fc);
968 LOG (GNUNET_ERROR_TYPE_DEBUG, " task %u\n", fc->poll_task);
973 * Function called if a connection has been stalled for a while,
974 * possibly due to a missed ACK. Poll the neighbor about its ACK status.
976 * @param cls Closure (poll ctx).
977 * @param tc TaskContext.
980 connection_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
982 struct MeshFlowControl *fc = cls;
983 struct GNUNET_MESH_Poll msg;
984 struct MeshConnection *c;
986 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
987 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
993 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** Polling!\n");
994 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** connection [%s]\n", GMC_2s (c));
995 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** %s\n",
996 fc == &c->fwd_fc ? "FWD" : "BCK");
998 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL);
999 msg.header.size = htons (sizeof (msg));
1000 msg.pid = htonl (fc->last_pid_sent);
1001 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** last pid sent: %u!\n", fc->last_pid_sent);
1002 fc->poll_msg = GMC_send_prebuilt_message (&msg.header, c, fc == &c->fwd_fc,
1008 * Timeout function due to lack of keepalive/traffic from the owner.
1009 * Destroys connection if called.
1011 * @param cls Closure (connection to destroy).
1012 * @param tc TaskContext.
1015 connection_fwd_timeout (void *cls,
1016 const struct GNUNET_SCHEDULER_TaskContext *tc)
1018 struct MeshConnection *c = cls;
1020 c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
1021 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1023 LOG (GNUNET_ERROR_TYPE_DEBUG,
1024 "Connection %s[%X] FWD timed out. Destroying.\n",
1028 if (GMC_is_origin (c, GNUNET_YES)) /* If local, leave. */
1036 * Timeout function due to lack of keepalive/traffic from the destination.
1037 * Destroys connection if called.
1039 * @param cls Closure (connection to destroy).
1040 * @param tc TaskContext
1043 connection_bck_timeout (void *cls,
1044 const struct GNUNET_SCHEDULER_TaskContext *tc)
1046 struct MeshConnection *c = cls;
1048 c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
1049 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1052 LOG (GNUNET_ERROR_TYPE_DEBUG,
1053 "Connection %s[%X] FWD timed out. Destroying.\n",
1054 GMT_2s (c->t), c->id);
1056 if (GMC_is_origin (c, GNUNET_NO)) /* If local, leave. */
1064 * Resets the connection timeout task, some other message has done the
1066 * - For the first peer on the direction this means to send
1067 * a keepalive or a path confirmation message (either create or ACK).
1068 * - For all other peers, this means to destroy the connection,
1069 * due to lack of activity.
1070 * Starts the tiemout if no timeout was running (connection just created).
1072 * @param c Connection whose timeout to reset.
1073 * @param fwd Is this forward?
1075 * TODO use heap to improve efficiency of scheduler.
1078 connection_reset_timeout (struct MeshConnection *c, int fwd)
1080 GNUNET_SCHEDULER_TaskIdentifier *ti;
1081 GNUNET_SCHEDULER_Task f;
1083 ti = fwd ? &c->fwd_maintenance_task : &c->bck_maintenance_task;
1085 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connection %s reset timeout\n", GM_f2s (fwd));
1087 if (GNUNET_SCHEDULER_NO_TASK != *ti)
1088 GNUNET_SCHEDULER_cancel (*ti);
1090 if (GMC_is_origin (c, fwd)) /* Startpoint */
1092 f = fwd ? &connection_fwd_keepalive : &connection_bck_keepalive;
1093 *ti = GNUNET_SCHEDULER_add_delayed (refresh_connection_time, f, c);
1095 else /* Relay, endpoint. */
1097 struct GNUNET_TIME_Relative delay;
1099 delay = GNUNET_TIME_relative_multiply (refresh_connection_time, 4);
1100 f = fwd ? &connection_fwd_timeout : &connection_bck_timeout;
1101 *ti = GNUNET_SCHEDULER_add_delayed (delay, f, c);
1107 * Add the connection to the list of both neighbors.
1109 * @param c Connection.
1111 * @return #GNUNET_OK if everything went fine
1112 * #GNUNET_SYSERR if the was an error and @c c is malformed.
1115 register_neighbors (struct MeshConnection *c)
1117 struct MeshPeer *next_peer;
1118 struct MeshPeer *prev_peer;
1120 next_peer = get_next_hop (c);
1121 prev_peer = get_prev_hop (c);
1123 if (GNUNET_NO == GMP_is_neighbor (next_peer)
1124 || GNUNET_NO == GMP_is_neighbor (prev_peer))
1125 return GNUNET_SYSERR;
1127 GMP_add_connection (next_peer, c);
1128 GMP_add_connection (prev_peer, c);
1135 * Remove the connection from the list of both neighbors.
1137 * @param c Connection.
1140 unregister_neighbors (struct MeshConnection *c)
1142 struct MeshPeer *peer;
1144 peer = get_next_hop (c);
1145 GMP_remove_connection (peer, c);
1147 peer = get_prev_hop (c);
1148 GMP_remove_connection (peer, c);
1154 * Bind the connection to the peer and the tunnel to that peer.
1156 * If the peer has no tunnel, create one. Update tunnel and connection
1157 * data structres to reflect new status.
1159 * @param c Connection.
1163 add_to_peer (struct MeshConnection *c, struct MeshPeer *peer)
1165 GMP_add_tunnel (peer);
1166 c->t = GMP_get_tunnel (peer);
1167 GMT_add_connection (c->t, c);
1170 /******************************************************************************/
1171 /******************************** API ***********************************/
1172 /******************************************************************************/
1175 * Core handler for connection creation.
1177 * @param cls Closure (unused).
1178 * @param peer Sender (neighbor).
1179 * @param message Message.
1181 * @return GNUNET_OK to keep the connection open,
1182 * GNUNET_SYSERR to close it (signal serious error)
1185 GMC_handle_create (void *cls, const struct GNUNET_PeerIdentity *peer,
1186 const struct GNUNET_MessageHeader *message)
1188 struct GNUNET_MESH_ConnectionCreate *msg;
1189 struct GNUNET_PeerIdentity *id;
1190 struct GNUNET_HashCode *cid;
1191 struct MeshPeerPath *path;
1192 struct MeshPeer *dest_peer;
1193 struct MeshPeer *orig_peer;
1194 struct MeshConnection *c;
1195 unsigned int own_pos;
1199 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1200 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received a connection create msg\n");
1203 size = ntohs (message->size);
1204 if (size < sizeof (struct GNUNET_MESH_ConnectionCreate))
1206 GNUNET_break_op (0);
1210 /* Calculate hops */
1211 size -= sizeof (struct GNUNET_MESH_ConnectionCreate);
1212 if (size % sizeof (struct GNUNET_PeerIdentity))
1214 GNUNET_break_op (0);
1217 size /= sizeof (struct GNUNET_PeerIdentity);
1220 GNUNET_break_op (0);
1223 LOG (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
1225 /* Get parameters */
1226 msg = (struct GNUNET_MESH_ConnectionCreate *) message;
1228 id = (struct GNUNET_PeerIdentity *) &msg[1];
1229 LOG (GNUNET_ERROR_TYPE_DEBUG,
1230 " connection %s (%s).\n",
1231 GNUNET_h2s (cid), GNUNET_i2s (id));
1233 /* Create connection */
1234 c = connection_get (cid);
1238 LOG (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
1239 path = path_new (size);
1241 for (i = 0; i < size; i++)
1243 LOG (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n",
1244 GNUNET_i2s (&id[i]));
1245 path->peers[i] = GNUNET_PEER_intern (&id[i]);
1246 if (path->peers[i] == myid)
1249 if (own_pos == 0 && path->peers[own_pos] != myid)
1251 /* create path: self not found in path through self */
1252 GNUNET_break_op (0);
1253 path_destroy (path);
1256 LOG (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
1257 GMP_add_path_to_all (path, GNUNET_NO);
1258 LOG (GNUNET_ERROR_TYPE_DEBUG, " Creating connection\n");
1259 c = GMC_new (cid, NULL, path_duplicate (path), own_pos);
1262 path_destroy (path);
1265 connection_reset_timeout (c, GNUNET_YES);
1269 path = path_duplicate (c->path);
1271 if (MESH_CONNECTION_NEW == c->state)
1272 connection_change_state (c, MESH_CONNECTION_SENT);
1274 /* Remember peers */
1275 dest_peer = GMP_get (&id[size - 1]);
1276 orig_peer = GMP_get (&id[0]);
1278 /* Is it a connection to us? */
1279 if (c->own_pos == size - 1)
1281 LOG (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
1282 GMP_add_path_to_origin (orig_peer, path_duplicate (path), GNUNET_YES);
1284 add_to_peer (c, orig_peer);
1285 if (MESH_TUNNEL3_NEW == GMT_get_cstate (c->t))
1286 GMT_change_cstate (c->t, MESH_TUNNEL3_WAITING);
1288 send_connection_ack (c, GNUNET_NO);
1289 if (MESH_CONNECTION_SENT == c->state)
1290 connection_change_state (c, MESH_CONNECTION_ACK);
1292 /* Keep tunnel alive in direction dest->owner*/
1293 c->bck_maintenance_task =
1294 GNUNET_SCHEDULER_add_delayed (create_connection_time,
1295 &connection_bck_keepalive, c);
1299 /* It's for somebody else! Retransmit. */
1300 LOG (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
1301 GMP_add_path (dest_peer, path_duplicate (path), GNUNET_NO);
1302 GMP_add_path_to_origin (orig_peer, path_duplicate (path), GNUNET_NO);
1303 GMC_send_prebuilt_message (message, c, GNUNET_YES, NULL, NULL);
1305 path_destroy (path);
1311 * Core handler for path confirmations.
1313 * @param cls closure
1314 * @param message message
1315 * @param peer peer identity this notification is about
1317 * @return GNUNET_OK to keep the connection open,
1318 * GNUNET_SYSERR to close it (signal serious error)
1321 GMC_handle_confirm (void *cls, const struct GNUNET_PeerIdentity *peer,
1322 const struct GNUNET_MessageHeader *message)
1324 struct GNUNET_MESH_ConnectionACK *msg;
1325 struct MeshConnection *c;
1326 struct MeshPeerPath *p;
1327 struct MeshPeer *pi;
1328 enum MeshConnectionState oldstate;
1331 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1332 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received a connection ACK msg\n");
1333 msg = (struct GNUNET_MESH_ConnectionACK *) message;
1334 LOG (GNUNET_ERROR_TYPE_DEBUG, " on connection %s\n",
1335 GNUNET_h2s (&msg->cid));
1336 c = connection_get (&msg->cid);
1339 GNUNET_STATISTICS_update (stats, "# control on unknown connection",
1341 LOG (GNUNET_ERROR_TYPE_DEBUG, " don't know the connection!\n");
1345 oldstate = c->state;
1346 LOG (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n", GNUNET_i2s (peer));
1347 pi = GMP_get (peer);
1348 if (get_next_hop (c) == pi)
1350 LOG (GNUNET_ERROR_TYPE_DEBUG, " SYNACK\n");
1352 if (MESH_CONNECTION_SENT == oldstate)
1353 connection_change_state (c, MESH_CONNECTION_ACK);
1355 else if (get_prev_hop (c) == pi)
1357 LOG (GNUNET_ERROR_TYPE_DEBUG, " ACK\n");
1359 connection_change_state (c, MESH_CONNECTION_READY);
1363 GNUNET_break_op (0);
1367 connection_reset_timeout (c, fwd);
1369 /* Add path to peers? */
1373 GMP_add_path_to_all (p, GNUNET_YES);
1380 /* Message for us as creator? */
1381 if (GMC_is_origin (c, GNUNET_YES))
1383 if (GNUNET_NO != fwd)
1385 GNUNET_break_op (0);
1388 LOG (GNUNET_ERROR_TYPE_DEBUG, " Connection (SYN)ACK for us!\n");
1390 /* If just created, cancel the short timeout and start a long one */
1391 if (MESH_CONNECTION_SENT == oldstate)
1392 connection_reset_timeout (c, GNUNET_YES);
1394 /* Change connection and tunnel state */
1395 connection_change_state (c, MESH_CONNECTION_READY);
1396 if (MESH_TUNNEL3_WAITING == GMT_get_cstate (c->t))
1397 GMT_change_cstate (c->t, MESH_TUNNEL3_READY);
1399 /* Send ACK (~TCP ACK)*/
1400 send_connection_ack (c, GNUNET_YES);
1404 /* Message for us as destination? */
1405 if (GMC_is_terminal (c, GNUNET_YES))
1407 if (GNUNET_YES != fwd)
1409 GNUNET_break_op (0);
1412 LOG (GNUNET_ERROR_TYPE_DEBUG, " Connection ACK for us!\n");
1414 /* If just created, cancel the short timeout and start a long one */
1415 if (MESH_CONNECTION_ACK == oldstate)
1416 connection_reset_timeout (c, GNUNET_NO);
1418 /* Change tunnel state */
1419 if (MESH_TUNNEL3_WAITING == GMT_get_cstate (c->t))
1420 GMT_change_cstate (c->t, MESH_TUNNEL3_READY);
1425 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
1426 GMC_send_prebuilt_message (message, c, fwd, NULL, NULL);
1432 * Core handler for notifications of broken paths
1434 * @param cls Closure (unused).
1435 * @param id Peer identity of sending neighbor.
1436 * @param message Message.
1438 * @return GNUNET_OK to keep the connection open,
1439 * GNUNET_SYSERR to close it (signal serious error)
1442 GMC_handle_broken (void* cls,
1443 const struct GNUNET_PeerIdentity* id,
1444 const struct GNUNET_MessageHeader* message)
1446 struct GNUNET_MESH_ConnectionBroken *msg;
1447 struct MeshConnection *c;
1450 LOG (GNUNET_ERROR_TYPE_DEBUG,
1451 "Received a CONNECTION BROKEN msg from %s\n", GNUNET_i2s (id));
1452 msg = (struct GNUNET_MESH_ConnectionBroken *) message;
1453 LOG (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
1454 GNUNET_i2s (&msg->peer1));
1455 LOG (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
1456 GNUNET_i2s (&msg->peer2));
1457 c = connection_get (&msg->cid);
1460 GNUNET_break_op (0);
1464 fwd = is_fwd (c, id);
1465 connection_cancel_queues (c, !fwd);
1466 if (GMC_is_terminal (c, fwd))
1468 if (0 < c->pending_messages)
1469 c->destroy = GNUNET_YES;
1475 GMC_send_prebuilt_message (message, c, fwd, NULL, NULL);
1476 c->destroy = GNUNET_YES;
1485 * Core handler for tunnel destruction
1487 * @param cls Closure (unused).
1488 * @param peer Peer identity of sending neighbor.
1489 * @param message Message.
1491 * @return GNUNET_OK to keep the connection open,
1492 * GNUNET_SYSERR to close it (signal serious error)
1495 GMC_handle_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
1496 const struct GNUNET_MessageHeader *message)
1498 struct GNUNET_MESH_ConnectionDestroy *msg;
1499 struct MeshConnection *c;
1502 msg = (struct GNUNET_MESH_ConnectionDestroy *) message;
1503 LOG (GNUNET_ERROR_TYPE_DEBUG,
1504 "Got a CONNECTION DESTROY message from %s\n",
1506 LOG (GNUNET_ERROR_TYPE_DEBUG,
1507 " for connection %s\n",
1508 GNUNET_h2s (&msg->cid));
1509 c = connection_get (&msg->cid);
1512 /* Probably already got the message from another path,
1513 * destroyed the tunnel and retransmitted to children.
1516 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel",
1518 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection unknown: already destroyed?\n");
1521 fwd = is_fwd (c, peer);
1522 if (GNUNET_SYSERR == fwd)
1524 GNUNET_break_op (0);
1527 GMC_send_prebuilt_message (message, c, fwd, NULL, NULL);
1528 c->destroy = GNUNET_YES;
1529 c->state = MESH_CONNECTION_DESTROYED;
1535 * Generic handler for mesh network encrypted traffic.
1537 * @param peer Peer identity this notification is about.
1538 * @param msg Encrypted message.
1540 * @return GNUNET_OK to keep the connection open,
1541 * GNUNET_SYSERR to close it (signal serious error)
1544 handle_mesh_encrypted (const struct GNUNET_PeerIdentity *peer,
1545 const struct GNUNET_MESH_Encrypted *msg)
1547 struct MeshConnection *c;
1548 struct MeshPeer *neighbor;
1549 struct MeshFlowControl *fc;
1550 GNUNET_PEER_Id peer_id;
1558 size = ntohs (msg->header.size);
1560 sizeof (struct GNUNET_MESH_Encrypted) +
1561 sizeof (struct GNUNET_MessageHeader))
1563 GNUNET_break_op (0);
1566 type = ntohs (msg->header.type);
1567 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1568 LOG (GNUNET_ERROR_TYPE_DEBUG, "got a %s message (#%u) from %s\n",
1569 GM_m2s (type), ntohl (msg->pid), GNUNET_i2s (peer));
1571 /* Check connection */
1572 c = connection_get (&msg->cid);
1575 GNUNET_STATISTICS_update (stats, "# unknown connection", 1, GNUNET_NO);
1576 LOG (GNUNET_ERROR_TYPE_DEBUG,
1577 "WARNING connection %s unknown\n",
1578 GNUNET_h2s (&msg->cid));
1582 /* Check if origin is as expected */
1583 neighbor = get_prev_hop (c);
1584 peer_id = GNUNET_PEER_search (peer);
1585 if (peer_id == GMP_get_short_id (neighbor))
1591 neighbor = get_next_hop (c);
1592 if (peer_id == GMP_get_short_id (neighbor))
1598 /* Unexpected peer sending traffic on a connection. */
1599 GNUNET_break_op (0);
1605 fc = fwd ? &c->bck_fc : &c->fwd_fc;
1606 pid = ntohl (msg->pid);
1607 if (GM_is_pid_bigger (pid, fc->last_ack_sent))
1609 GNUNET_STATISTICS_update (stats, "# unsolicited message", 1, GNUNET_NO);
1610 LOG (GNUNET_ERROR_TYPE_DEBUG,
1611 "WARNING Received PID %u, (prev %u), ACK %u\n",
1612 pid, fc->last_pid_recv, fc->last_ack_sent);
1615 if (GNUNET_NO == GM_is_pid_bigger (pid, fc->last_pid_recv))
1617 GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO);
1618 LOG (GNUNET_ERROR_TYPE_DEBUG,
1619 " Pid %u not expected (%u+), dropping!\n",
1620 pid, fc->last_pid_recv + 1);
1623 if (MESH_CONNECTION_SENT == c->state || MESH_CONNECTION_ACK == c->state)
1624 connection_change_state (c, MESH_CONNECTION_READY);
1625 connection_reset_timeout (c, fwd);
1626 fc->last_pid_recv = pid;
1628 /* Is this message for us? */
1629 if (GMC_is_terminal (c, fwd))
1631 /* TODO signature verification */
1632 LOG (GNUNET_ERROR_TYPE_DEBUG, " message for us!\n");
1633 GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO);
1640 fc->last_pid_recv = pid;
1641 GMT_handle_encrypted (c->t, msg);
1642 GMC_send_ack (c, fwd, GNUNET_NO);
1646 /* Message not for us: forward to next hop */
1647 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
1648 ttl = ntohl (msg->ttl);
1649 LOG (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
1652 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
1653 LOG (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
1654 GMC_send_ack (c, fwd, GNUNET_NO);
1658 GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
1659 GMC_send_prebuilt_message (&msg->header, c, fwd, NULL, NULL);
1665 * Generic handler for mesh network encrypted traffic.
1667 * @param peer Peer identity this notification is about.
1668 * @param msg Encrypted message.
1670 * @return GNUNET_OK to keep the connection open,
1671 * GNUNET_SYSERR to close it (signal serious error)
1674 handle_mesh_kx (const struct GNUNET_PeerIdentity *peer,
1675 const struct GNUNET_MESH_KX *msg)
1677 struct MeshConnection *c;
1678 struct MeshPeer *neighbor;
1679 GNUNET_PEER_Id peer_id;
1685 size = ntohs (msg->header.size);
1687 sizeof (struct GNUNET_MESH_Encrypted) +
1688 sizeof (struct GNUNET_MessageHeader))
1690 GNUNET_break_op (0);
1693 type = ntohs (msg->header.type);
1694 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1695 LOG (GNUNET_ERROR_TYPE_DEBUG, "got a %s message from %s\n",
1696 GM_m2s (type), GNUNET_i2s (peer));
1698 /* Check connection */
1699 c = connection_get (&msg->cid);
1702 GNUNET_STATISTICS_update (stats, "# unknown connection", 1, GNUNET_NO);
1703 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING connection unknown\n");
1707 /* Check if origin is as expected */
1708 neighbor = get_prev_hop (c);
1709 peer_id = GNUNET_PEER_search (peer);
1710 if (peer_id == GMP_get_short_id (neighbor))
1716 neighbor = get_next_hop (c);
1717 if (peer_id == GMP_get_short_id (neighbor))
1723 /* Unexpected peer sending traffic on a connection. */
1724 GNUNET_break_op (0);
1729 /* Count as connection confirmation. */
1730 if (MESH_CONNECTION_SENT == c->state || MESH_CONNECTION_ACK == c->state)
1731 connection_change_state (c, MESH_CONNECTION_READY);
1732 connection_reset_timeout (c, fwd);
1735 if (MESH_TUNNEL3_WAITING == GMT_get_cstate (c->t))
1736 GMT_change_cstate (c->t, MESH_TUNNEL3_READY);
1739 /* Is this message for us? */
1740 if (GMC_is_terminal (c, fwd))
1742 LOG (GNUNET_ERROR_TYPE_DEBUG, " message for us!\n");
1743 GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO);
1749 GMT_handle_kx (c->t, &msg[1].header);
1753 /* Message not for us: forward to next hop */
1754 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
1755 GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
1756 GMC_send_prebuilt_message (&msg->header, c, fwd, NULL, NULL);
1763 * Core handler for encrypted mesh network traffic (channel mgmt, data).
1765 * @param cls Closure (unused).
1766 * @param message Message received.
1767 * @param peer Peer who sent the message.
1769 * @return GNUNET_OK to keep the connection open,
1770 * GNUNET_SYSERR to close it (signal serious error)
1773 GMC_handle_encrypted (void *cls, const struct GNUNET_PeerIdentity *peer,
1774 const struct GNUNET_MessageHeader *message)
1776 return handle_mesh_encrypted (peer,
1777 (struct GNUNET_MESH_Encrypted *)message);
1782 * Core handler for key exchange traffic (ephemeral key, ping, pong).
1784 * @param cls Closure (unused).
1785 * @param message Message received.
1786 * @param peer Peer who sent the message.
1788 * @return GNUNET_OK to keep the connection open,
1789 * GNUNET_SYSERR to close it (signal serious error)
1792 GMC_handle_kx (void *cls, const struct GNUNET_PeerIdentity *peer,
1793 const struct GNUNET_MessageHeader *message)
1795 return handle_mesh_kx (peer,
1796 (struct GNUNET_MESH_KX *) message);
1801 * Core handler for mesh network traffic point-to-point acks.
1803 * @param cls closure
1804 * @param message message
1805 * @param peer peer identity this notification is about
1807 * @return GNUNET_OK to keep the connection open,
1808 * GNUNET_SYSERR to close it (signal serious error)
1811 GMC_handle_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
1812 const struct GNUNET_MessageHeader *message)
1814 struct GNUNET_MESH_ACK *msg;
1815 struct MeshConnection *c;
1816 struct MeshFlowControl *fc;
1821 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1822 LOG (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
1824 msg = (struct GNUNET_MESH_ACK *) message;
1826 c = connection_get (&msg->cid);
1830 GNUNET_STATISTICS_update (stats, "# ack on unknown connection", 1,
1835 /* Is this a forward or backward ACK? */
1836 id = GNUNET_PEER_search (peer);
1837 if (GMP_get_short_id (get_next_hop (c)) == id)
1839 LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
1843 else if (GMP_get_short_id (get_prev_hop (c)) == id)
1845 LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
1851 GNUNET_break_op (0);
1855 ack = ntohl (msg->ack);
1856 LOG (GNUNET_ERROR_TYPE_DEBUG, " ACK %u (was %u)\n",
1857 ack, fc->last_ack_recv);
1858 if (GM_is_pid_bigger (ack, fc->last_ack_recv))
1859 fc->last_ack_recv = ack;
1861 /* Cancel polling if the ACK is big enough. */
1862 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task &&
1863 GM_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
1865 LOG (GNUNET_ERROR_TYPE_DEBUG, " Cancel poll\n");
1866 GNUNET_SCHEDULER_cancel (fc->poll_task);
1867 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
1868 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
1871 connection_unlock_queue (c, fwd);
1878 * Core handler for mesh network traffic point-to-point ack polls.
1880 * @param cls closure
1881 * @param message message
1882 * @param peer peer identity this notification is about
1884 * @return GNUNET_OK to keep the connection open,
1885 * GNUNET_SYSERR to close it (signal serious error)
1888 GMC_handle_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
1889 const struct GNUNET_MessageHeader *message)
1891 struct GNUNET_MESH_Poll *msg;
1892 struct MeshConnection *c;
1893 struct MeshFlowControl *fc;
1898 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1899 LOG (GNUNET_ERROR_TYPE_DEBUG,
1900 "Got a POLL packet from %s!\n",
1903 msg = (struct GNUNET_MESH_Poll *) message;
1905 c = connection_get (&msg->cid);
1909 GNUNET_STATISTICS_update (stats, "# poll on unknown connection", 1,
1911 GNUNET_break_op (0);
1915 /* Is this a forward or backward ACK?
1916 * Note: a poll should never be needed in a loopback case,
1917 * since there is no possiblility of packet loss there, so
1918 * this way of discerining FWD/BCK should not be a problem.
1920 id = GNUNET_PEER_search (peer);
1921 if (GMP_get_short_id (get_next_hop (c)) == id)
1923 LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD FC\n");
1926 else if (GMP_get_short_id (get_prev_hop (c)) == id)
1928 LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK FC\n");
1933 GNUNET_break_op (0);
1937 pid = ntohl (msg->pid);
1938 LOG (GNUNET_ERROR_TYPE_DEBUG, " PID %u, OLD %u\n", pid, fc->last_pid_recv);
1939 fc->last_pid_recv = pid;
1940 fwd = fc == &c->bck_fc;
1941 GMC_send_ack (c, fwd, GNUNET_YES);
1948 * Core handler for mesh keepalives.
1950 * @param cls closure
1951 * @param message message
1952 * @param peer peer identity this notification is about
1953 * @return GNUNET_OK to keep the connection open,
1954 * GNUNET_SYSERR to close it (signal serious error)
1956 * TODO: Check who we got this from, to validate route.
1959 GMC_handle_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
1960 const struct GNUNET_MessageHeader *message)
1962 struct GNUNET_MESH_ConnectionKeepAlive *msg;
1963 struct MeshConnection *c;
1964 struct MeshPeer *neighbor;
1965 GNUNET_PEER_Id peer_id;
1968 msg = (struct GNUNET_MESH_ConnectionKeepAlive *) message;
1969 LOG (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
1972 c = connection_get (&msg->cid);
1975 GNUNET_STATISTICS_update (stats, "# keepalive on unknown connection", 1,
1980 /* Check if origin is as expected TODO refactor and reuse */
1981 peer_id = GNUNET_PEER_search (peer);
1982 neighbor = get_prev_hop (c);
1983 if (peer_id == GMP_get_short_id (neighbor))
1989 neighbor = get_next_hop (c);
1990 if (peer_id == GMP_get_short_id (neighbor))
1996 GNUNET_break_op (0);
2001 connection_change_state (c, MESH_CONNECTION_READY);
2002 connection_reset_timeout (c, fwd);
2004 if (GMC_is_terminal (c, fwd))
2007 GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
2008 GMC_send_prebuilt_message (message, c, fwd, NULL, NULL);
2015 * Send an ACK on the appropriate connection/channel, depending on
2016 * the direction and the position of the peer.
2018 * @param c Which connection to send the hop-by-hop ACK.
2019 * @param fwd Is this a fwd ACK? (will go dest->root).
2020 * @param force Send the ACK even if suboptimal (e.g. requested by POLL).
2023 GMC_send_ack (struct MeshConnection *c, int fwd, int force)
2025 unsigned int buffer;
2027 LOG (GNUNET_ERROR_TYPE_DEBUG,
2028 "GMC send %s ACK on %s\n",
2029 GM_f2s (fwd), GMC_2s (c));
2037 if (GNUNET_NO != c->destroy)
2039 LOG (GNUNET_ERROR_TYPE_DEBUG, " being destroyed, why bother...\n");
2043 /* Get available buffer space */
2044 if (GMC_is_terminal (c, fwd))
2046 LOG (GNUNET_ERROR_TYPE_DEBUG, " getting from all channels\n");
2047 buffer = GMT_get_channels_buffer (c->t);
2051 LOG (GNUNET_ERROR_TYPE_DEBUG, " getting from one connection\n");
2052 buffer = GMC_get_buffer (c, fwd);
2054 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer available: %u\n", buffer);
2055 if (0 == buffer && GNUNET_NO == force)
2058 /* Send available buffer space */
2059 if (GMC_is_origin (c, fwd))
2061 GNUNET_assert (NULL != c->t);
2062 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on channels...\n");
2063 GMT_unchoke_channels (c->t);
2067 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on connection\n");
2068 send_ack (c, buffer, fwd, force);
2074 * Initialize the connections subsystem
2076 * @param c Configuration handle.
2079 GMC_init (const struct GNUNET_CONFIGURATION_Handle *c)
2081 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
2083 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
2086 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
2087 "MESH", "MAX_MSGS_QUEUE", "MISSING");
2088 GNUNET_SCHEDULER_shutdown ();
2093 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_CONNECTIONS",
2096 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
2097 "MESH", "MAX_CONNECTIONS", "MISSING");
2098 GNUNET_SCHEDULER_shutdown ();
2103 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_CONNECTION_TIME",
2104 &refresh_connection_time))
2106 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
2107 "MESH", "REFRESH_CONNECTION_TIME", "MISSING");
2108 GNUNET_SCHEDULER_shutdown ();
2111 create_connection_time = GNUNET_TIME_UNIT_SECONDS;
2112 connections = GNUNET_CONTAINER_multihashmap_create (1024, GNUNET_YES);
2117 * Destroy each connection on shutdown.
2119 * @param cls Closure (unused).
2120 * @param key Current key code (CID, unused).
2121 * @param value Value in the hash map (connection)
2123 * @return #GNUNET_YES, because we should continue to iterate,
2126 shutdown_iterator (void *cls,
2127 const struct GNUNET_HashCode *key,
2130 struct MeshConnection *c = value;
2138 * Shut down the connections subsystem.
2143 GNUNET_CONTAINER_multihashmap_iterate (connections, &shutdown_iterator, NULL);
2144 GNUNET_CONTAINER_multihashmap_destroy (connections);
2149 struct MeshConnection *
2150 GMC_new (const struct GNUNET_HashCode *cid,
2151 struct MeshTunnel3 *t,
2152 struct MeshPeerPath *p,
2153 unsigned int own_pos)
2155 struct MeshConnection *c;
2157 c = GNUNET_new (struct MeshConnection);
2159 GNUNET_CONTAINER_multihashmap_put (connections, &c->id, c,
2160 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
2161 fc_init (&c->fwd_fc);
2162 fc_init (&c->bck_fc);
2167 if (own_pos > p->length - 1)
2173 c->own_pos = own_pos;
2178 c->fwd_maintenance_task =
2179 GNUNET_SCHEDULER_add_delayed (create_connection_time,
2180 &connection_fwd_keepalive, c);
2182 if (GNUNET_OK != register_neighbors (c))
2193 GMC_destroy (struct MeshConnection *c)
2198 if (2 == c->destroy) /* cancel queues -> GMP_queue_cancel -> q_destroy -> */
2199 return; /* -> message_sent -> GMC_destroy. Don't loop. */
2202 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying connection %s\n", GMC_2s (c));
2203 LOG (GNUNET_ERROR_TYPE_DEBUG, " fc's f: %p, b: %p\n",
2204 &c->fwd_fc, &c->bck_fc);
2205 LOG (GNUNET_ERROR_TYPE_DEBUG, " fc tasks f: %u, b: %u\n",
2206 c->fwd_fc.poll_task, c->bck_fc.poll_task);
2208 /* Cancel all traffic */
2209 connection_cancel_queues (c, GNUNET_YES);
2210 connection_cancel_queues (c, GNUNET_NO);
2212 LOG (GNUNET_ERROR_TYPE_DEBUG, " fc tasks f: %u, b: %u\n",
2213 c->fwd_fc.poll_task, c->bck_fc.poll_task);
2215 /* Cancel maintainance task (keepalive/timeout) */
2216 if (GNUNET_SCHEDULER_NO_TASK != c->fwd_maintenance_task)
2217 GNUNET_SCHEDULER_cancel (c->fwd_maintenance_task);
2218 if (GNUNET_SCHEDULER_NO_TASK != c->bck_maintenance_task)
2219 GNUNET_SCHEDULER_cancel (c->bck_maintenance_task);
2220 if (GNUNET_SCHEDULER_NO_TASK != c->fwd_fc.poll_task)
2222 GNUNET_SCHEDULER_cancel (c->fwd_fc.poll_task);
2223 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL FWD canceled\n");
2225 if (GNUNET_SCHEDULER_NO_TASK != c->bck_fc.poll_task)
2227 GNUNET_SCHEDULER_cancel (c->bck_fc.poll_task);
2228 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL BCK canceled\n");
2230 if (NULL != c->fwd_fc.poll_msg)
2232 GMC_cancel (c->fwd_fc.poll_msg);
2233 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL msg FWD canceled\n");
2235 if (NULL != c->bck_fc.poll_msg)
2237 GMC_cancel (c->bck_fc.poll_msg);
2238 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL msg BCK canceled\n");
2241 /* Unregister from neighbors */
2242 unregister_neighbors (c);
2245 GNUNET_STATISTICS_update (stats, "# connections", -1, GNUNET_NO);
2247 GMT_remove_connection (c->t, c);
2249 if (GNUNET_NO == GMC_is_origin (c, GNUNET_YES))
2250 path_destroy (c->path);
2252 GNUNET_break (GNUNET_YES ==
2253 GNUNET_CONTAINER_multihashmap_remove (connections, &c->id, c));
2259 * Get the connection ID.
2261 * @param c Connection to get the ID from.
2263 * @return ID of the connection.
2265 const struct GNUNET_HashCode *
2266 GMC_get_id (const struct MeshConnection *c)
2273 * Get the connection path.
2275 * @param c Connection to get the path from.
2277 * @return path used by the connection.
2279 const struct MeshPeerPath *
2280 GMC_get_path (const struct MeshConnection *c)
2282 if (GNUNET_NO == c->destroy)
2289 * Get the connection state.
2291 * @param c Connection to get the state from.
2293 * @return state of the connection.
2295 enum MeshConnectionState
2296 GMC_get_state (const struct MeshConnection *c)
2302 * Get the connection tunnel.
2304 * @param c Connection to get the tunnel from.
2306 * @return tunnel of the connection.
2308 struct MeshTunnel3 *
2309 GMC_get_tunnel (const struct MeshConnection *c)
2316 * Get free buffer space in a connection.
2318 * @param c Connection.
2319 * @param fwd Is query about FWD traffic?
2321 * @return Free buffer space [0 - max_msgs_queue/max_connections]
2324 GMC_get_buffer (struct MeshConnection *c, int fwd)
2326 struct MeshFlowControl *fc;
2328 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2330 return (fc->queue_max - fc->queue_n);
2334 * Get how many messages have we allowed to send to us from a direction.
2336 * @param c Connection.
2337 * @param fwd Are we asking about traffic from FWD (BCK messages)?
2339 * @return last_ack_sent - last_pid_recv
2342 GMC_get_allowed (struct MeshConnection *c, int fwd)
2344 struct MeshFlowControl *fc;
2346 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2347 if (GM_is_pid_bigger(fc->last_pid_recv, fc->last_ack_sent))
2351 return (fc->last_ack_sent - fc->last_pid_recv);
2355 * Get messages queued in a connection.
2357 * @param c Connection.
2358 * @param fwd Is query about FWD traffic?
2360 * @return Number of messages queued.
2363 GMC_get_qn (struct MeshConnection *c, int fwd)
2365 struct MeshFlowControl *fc;
2367 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2374 * Allow the connection to advertise a buffer of the given size.
2376 * The connection will send an @c fwd ACK message (so: in direction !fwd)
2377 * allowing up to last_pid_recv + buffer.
2379 * @param c Connection.
2380 * @param buffer How many more messages the connection can accept.
2381 * @param fwd Is this about FWD traffic? (The ack will go dest->root).
2384 GMC_allow (struct MeshConnection *c, unsigned int buffer, int fwd)
2386 send_ack (c, buffer, fwd, GNUNET_NO);
2391 * Notify other peers on a connection of a broken link. Mark connections
2392 * to destroy after all traffic has been sent.
2394 * @param c Connection on which there has been a disconnection.
2395 * @param peer Peer that disconnected.
2398 GMC_notify_broken (struct MeshConnection *c,
2399 struct MeshPeer *peer)
2403 LOG (GNUNET_ERROR_TYPE_DEBUG,
2404 " notify broken on %s due to %s disconnect\n",
2405 GMC_2s (c), GMP_2s (peer));
2407 fwd = peer == get_prev_hop (c);
2409 if (GNUNET_YES == GMC_is_terminal (c, fwd))
2411 /* Local shutdown, no one to notify about this. */
2415 if (GNUNET_NO == c->destroy)
2416 send_broken (c, &my_full_id, GMP_get_id (peer), fwd);
2418 /* Connection will have at least one pending message
2419 * (the one we just scheduled), so no point in checking whether to
2420 * destroy immediately. */
2421 c->destroy = GNUNET_YES;
2422 c->state = MESH_CONNECTION_DESTROYED;
2425 * Cancel all queues, if no message is left, connection will be destroyed.
2427 connection_cancel_queues (c, !fwd);
2434 * Is this peer the first one on the connection?
2436 * @param c Connection.
2437 * @param fwd Is this about fwd traffic?
2439 * @return #GNUNET_YES if origin, #GNUNET_NO if relay/terminal.
2442 GMC_is_origin (struct MeshConnection *c, int fwd)
2444 if (!fwd && c->path->length - 1 == c->own_pos )
2446 if (fwd && 0 == c->own_pos)
2453 * Is this peer the last one on the connection?
2455 * @param c Connection.
2456 * @param fwd Is this about fwd traffic?
2457 * Note that the ROOT is the terminal for BCK traffic!
2459 * @return #GNUNET_YES if terminal, #GNUNET_NO if relay/origin.
2462 GMC_is_terminal (struct MeshConnection *c, int fwd)
2464 return GMC_is_origin (c, !fwd);
2469 * See if we are allowed to send by the next hop in the given direction.
2471 * @param c Connection.
2472 * @param fwd Is this about fwd traffic?
2474 * @return #GNUNET_YES in case it's OK to send.
2477 GMC_is_sendable (struct MeshConnection *c, int fwd)
2479 struct MeshFlowControl *fc;
2481 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2482 if (GM_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
2488 * Sends an already built message on a connection, properly registering
2489 * all used resources.
2491 * @param message Message to send. Function makes a copy of it.
2492 * If message is not hop-by-hop, decrements TTL of copy.
2493 * @param c Connection on which this message is transmitted.
2494 * @param fwd Is this a fwd message?
2495 * @param cont Continuation called once message is sent. Can be NULL.
2496 * @param cont_cls Closure for @c cont.
2498 * @return Handle to cancel the message before it's sent.
2499 * NULL on error or if @c cont is NULL.
2500 * Invalid on @c cont call.
2502 struct MeshConnectionQueue *
2503 GMC_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
2504 struct MeshConnection *c, int fwd,
2505 GMC_sent cont, void *cont_cls)
2507 struct MeshFlowControl *fc;
2508 struct MeshConnectionQueue *q;
2514 size = ntohs (message->size);
2515 data = GNUNET_malloc (size);
2516 memcpy (data, message, size);
2517 type = ntohs (message->type);
2518 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send %s (%u bytes) on connection %s\n",
2519 GM_m2s (type), size, GMC_2s (c));
2521 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2522 droppable = GNUNET_YES;
2525 struct GNUNET_MESH_Encrypted *emsg;
2526 struct GNUNET_MESH_KX *kmsg;
2527 struct GNUNET_MESH_ACK *amsg;
2528 struct GNUNET_MESH_Poll *pmsg;
2529 struct GNUNET_MESH_ConnectionDestroy *dmsg;
2530 struct GNUNET_MESH_ConnectionBroken *bmsg;
2533 case GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED:
2534 emsg = (struct GNUNET_MESH_Encrypted *) data;
2535 ttl = ntohl (emsg->ttl);
2538 GNUNET_break_op (0);
2543 emsg->ttl = htonl (ttl - 1);
2544 emsg->pid = htonl (fc->next_pid++);
2545 LOG (GNUNET_ERROR_TYPE_DEBUG, " Q_N+ %p %u\n", fc, fc->queue_n);
2547 LOG (GNUNET_ERROR_TYPE_DEBUG, "pid %u\n", ntohl (emsg->pid));
2548 LOG (GNUNET_ERROR_TYPE_DEBUG, "last pid sent %u\n", fc->last_pid_sent);
2549 LOG (GNUNET_ERROR_TYPE_DEBUG, " ack recv %u\n", fc->last_ack_recv);
2550 if (GM_is_pid_bigger (fc->last_pid_sent + 1, fc->last_ack_recv))
2552 GMC_start_poll (c, fwd);
2556 case GNUNET_MESSAGE_TYPE_MESH_KX:
2557 kmsg = (struct GNUNET_MESH_KX *) data;
2561 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2562 amsg = (struct GNUNET_MESH_ACK *) data;
2564 LOG (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", ntohl (amsg->ack));
2565 droppable = GNUNET_NO;
2568 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2569 pmsg = (struct GNUNET_MESH_Poll *) data;
2571 LOG (GNUNET_ERROR_TYPE_DEBUG, " poll %u\n", ntohl (pmsg->pid));
2572 droppable = GNUNET_NO;
2575 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY:
2576 dmsg = (struct GNUNET_MESH_ConnectionDestroy *) data;
2581 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
2582 bmsg = (struct GNUNET_MESH_ConnectionBroken *) data;
2587 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
2588 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
2597 if (fc->queue_n > fc->queue_max && droppable)
2599 GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)",
2602 LOG (GNUNET_ERROR_TYPE_DEBUG,
2603 "queue full: %u/%u\n",
2604 fc->queue_n, fc->queue_max);
2605 if (GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED == type)
2611 return NULL; /* Drop this message */
2614 LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P+ %p %u\n", c, c->pending_messages);
2615 c->pending_messages++;
2619 (void) GMP_queue_add (get_hop (c, fwd), data, type, size, c, fwd,
2620 &message_sent, NULL);
2624 q = GNUNET_new (struct MeshConnectionQueue);
2625 q->q = GMP_queue_add (get_hop (c, fwd), data, type, size, c, fwd,
2635 q->cont_cls = cont_cls;
2641 * Cancel a previously sent message while it's in the queue.
2643 * ONLY can be called before the continuation given to the send function
2644 * is called. Once the continuation is called, the message is no longer in the
2647 * @param q Handle to the queue.
2650 GMC_cancel (struct MeshConnectionQueue *q)
2652 LOG (GNUNET_ERROR_TYPE_DEBUG, "! GMC cancel message\n");
2654 /* queue destroy calls message_sent, which calls q->cont and frees q */
2655 GMP_queue_destroy (q->q, GNUNET_YES);
2660 * Sends a CREATE CONNECTION message for a path to a peer.
2661 * Changes the connection and tunnel states if necessary.
2663 * @param connection Connection to create.
2666 GMC_send_create (struct MeshConnection *connection)
2668 enum MeshTunnel3CState state;
2671 size = sizeof (struct GNUNET_MESH_ConnectionCreate);
2672 size += connection->path->length * sizeof (struct GNUNET_PeerIdentity);
2673 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send connection create\n");
2674 GMP_queue_add (get_next_hop (connection), NULL,
2675 GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE,
2676 size, connection, GNUNET_YES, &message_sent, NULL);
2677 LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P+ %p %u (create)\n",
2678 connection, connection->pending_messages);
2679 connection->pending_messages++;
2680 state = GMT_get_cstate (connection->t);
2681 if (MESH_TUNNEL3_SEARCHING == state || MESH_TUNNEL3_NEW == state)
2682 GMT_change_cstate (connection->t, MESH_TUNNEL3_WAITING);
2683 if (MESH_CONNECTION_NEW == connection->state)
2684 connection_change_state (connection, MESH_CONNECTION_SENT);
2689 * Send a message to all peers in this connection that the connection
2690 * is no longer valid.
2692 * If some peer should not receive the message, it should be zero'ed out
2693 * before calling this function.
2695 * @param c The connection whose peers to notify.
2698 GMC_send_destroy (struct MeshConnection *c)
2700 struct GNUNET_MESH_ConnectionDestroy msg;
2702 if (GNUNET_YES == c->destroy)
2705 msg.header.size = htons (sizeof (msg));
2706 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY);;
2708 LOG (GNUNET_ERROR_TYPE_DEBUG,
2709 " sending connection destroy for connection %s\n",
2712 if (GNUNET_NO == GMC_is_terminal (c, GNUNET_YES))
2713 GMC_send_prebuilt_message (&msg.header, c, GNUNET_YES, NULL, NULL);
2714 if (GNUNET_NO == GMC_is_terminal (c, GNUNET_NO))
2715 GMC_send_prebuilt_message (&msg.header, c, GNUNET_NO, NULL, NULL);
2716 c->destroy = GNUNET_YES;
2717 c->state = MESH_CONNECTION_DESTROYED;
2722 * @brief Start a polling timer for the connection.
2724 * When a neighbor does not accept more traffic on the connection it could be
2725 * caused by a simple congestion or by a lost ACK. Polling enables to check
2726 * for the lastest ACK status for a connection.
2728 * @param c Connection.
2729 * @param fwd Should we poll in the FWD direction?
2732 GMC_start_poll (struct MeshConnection *c, int fwd)
2734 struct MeshFlowControl *fc;
2736 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2737 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL %s requested\n",
2739 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task || NULL != fc->poll_msg)
2741 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** not needed (%u, %p)\n",
2742 fc->poll_task, fc->poll_msg);
2745 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL started on request\n");
2746 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
2753 * @brief Stop polling a connection for ACKs.
2755 * Once we have enough ACKs for future traffic, polls are no longer necessary.
2757 * @param c Connection.
2758 * @param fwd Should we stop the poll in the FWD direction?
2761 GMC_stop_poll (struct MeshConnection *c, int fwd)
2763 struct MeshFlowControl *fc;
2765 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2766 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
2768 GNUNET_SCHEDULER_cancel (fc->poll_task);
2769 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2774 * Get a (static) string for a connection.
2776 * @param c Connection.
2779 GMC_2s (struct MeshConnection *c)
2786 static char buf[128];
2788 sprintf (buf, "%s (->%s)", GNUNET_h2s (&c->id), GMT_2s (c->t));
2791 return GNUNET_h2s (&c->id);