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 "gnunet-service-mesh_connection.h"
33 #include "gnunet-service-mesh_peer.h"
34 #include "gnunet-service-mesh_tunnel.h"
35 #include "gnunet-service-mesh_channel.h"
36 #include "mesh_protocol_enc.h"
37 #include "mesh_path.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;
110 * Keep a record of the last messages sent on this connection.
112 struct MeshConnectionPerformance
115 * Circular buffer for storing measurements.
117 double usecsperbyte[AVG_MSGS];
120 * Running average of @c usecsperbyte.
125 * How many values of @c usecsperbyte are valid.
130 * Index of the next "free" position in @c usecsperbyte.
137 * Struct containing all information regarding a connection to a peer.
139 struct MeshConnection
142 * Tunnel this connection is part of.
144 struct MeshTunnel3 *t;
147 * Flow control information for traffic fwd.
149 struct MeshFlowControl fwd_fc;
152 * Flow control information for traffic bck.
154 struct MeshFlowControl bck_fc;
157 * Measure connection performance on the endpoint.
159 struct MeshConnectionPerformance *perf;
162 * ID of the connection.
164 struct GNUNET_HashCode id;
167 * State of the connection.
169 enum MeshConnectionState state;
172 * Path being used for the tunnel.
174 struct MeshPeerPath *path;
177 * Position of the local peer in the path.
179 unsigned int own_pos;
182 * Task to keep the used paths alive at the owner,
183 * time tunnel out on all the other peers.
185 GNUNET_SCHEDULER_TaskIdentifier fwd_maintenance_task;
188 * Task to keep the used paths alive at the destination,
189 * time tunnel out on all the other peers.
191 GNUNET_SCHEDULER_TaskIdentifier bck_maintenance_task;
194 * Pending message count.
196 int pending_messages;
199 * Destroy flag: if true, destroy on last message.
204 /******************************************************************************/
205 /******************************* GLOBALS ***********************************/
206 /******************************************************************************/
209 * Global handle to the statistics service.
211 extern struct GNUNET_STATISTICS_Handle *stats;
214 * Connections known, indexed by cid (MeshConnection).
216 static struct GNUNET_CONTAINER_MultiHashMap *connections;
219 * How many connections are we willing to maintain.
220 * Local connections are always allowed, even if there are more connections than max.
222 static unsigned long long max_connections;
225 * How many messages *in total* are we willing to queue, divide by number of
226 * connections to get connection queue size.
228 static unsigned long long max_msgs_queue;
231 * How often to send path keepalives. Paths timeout after 4 missed.
233 static struct GNUNET_TIME_Relative refresh_connection_time;
236 /******************************************************************************/
237 /******************************** STATIC ***********************************/
238 /******************************************************************************/
240 #if 0 // avoid compiler warning for unused static function
242 fc_debug (struct MeshFlowControl *fc)
244 LOG (GNUNET_ERROR_TYPE_DEBUG, " IN: %u/%u\n",
245 fc->last_pid_recv, fc->last_ack_sent);
246 LOG (GNUNET_ERROR_TYPE_DEBUG, " OUT: %u/%u\n",
247 fc->last_pid_sent, fc->last_ack_recv);
248 LOG (GNUNET_ERROR_TYPE_DEBUG, " QUEUE: %u/%u\n",
249 fc->queue_n, fc->queue_max);
253 connection_debug (struct MeshConnection *c)
257 LOG (GNUNET_ERROR_TYPE_DEBUG, "*** DEBUG NULL CONNECTION ***\n");
260 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connection %s:%X\n",
261 peer2s (c->t->peer), GNUNET_h2s (&c->id));
262 LOG (GNUNET_ERROR_TYPE_DEBUG, " state: %u, pending msgs: %u\n",
263 c->state, c->pending_messages);
264 LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD FC\n");
265 fc_debug (&c->fwd_fc);
266 LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK FC\n");
267 fc_debug (&c->bck_fc);
272 * Get string description for tunnel state.
274 * @param s Tunnel state.
276 * @return String representation.
279 GMC_state2s (enum MeshConnectionState s)
283 case MESH_CONNECTION_NEW:
284 return "MESH_CONNECTION_NEW";
285 case MESH_CONNECTION_SENT:
286 return "MESH_CONNECTION_SENT";
287 case MESH_CONNECTION_ACK:
288 return "MESH_CONNECTION_ACK";
289 case MESH_CONNECTION_READY:
290 return "MESH_CONNECTION_READY";
292 return "MESH_CONNECTION_STATE_ERROR";
298 * Initialize a Flow Control structure to the initial state.
300 * @param fc Flow Control structure to initialize.
303 fc_init (struct MeshFlowControl *fc)
306 fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
307 fc->last_pid_recv = (uint32_t) -1;
308 fc->last_ack_sent = (uint32_t) 0;
309 fc->last_ack_recv = (uint32_t) 0;
310 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
311 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
313 fc->queue_max = (max_msgs_queue / max_connections) + 1;
320 * @param cid Connection ID.
322 static struct MeshConnection *
323 connection_get (const struct GNUNET_HashCode *cid)
325 return GNUNET_CONTAINER_multihashmap_get (connections, cid);
330 * Send an ACK informing the predecessor about the available buffer space.
332 * Note that for fwd ack, the FWD mean forward *traffic* (root->dest),
333 * the ACK itself goes "back" (dest->root).
335 * @param c Connection on which to send the ACK.
336 * @param buffer How much space free to advertise?
337 * @param fwd Is this FWD ACK? (Going dest->owner)
340 connection_send_ack (struct MeshConnection *c, unsigned int buffer, int fwd)
342 struct MeshFlowControl *next_fc;
343 struct MeshFlowControl *prev_fc;
344 struct GNUNET_MESH_ACK msg;
348 next_fc = fwd ? &c->fwd_fc : &c->bck_fc;
349 prev_fc = fwd ? &c->bck_fc : &c->fwd_fc;
351 LOG (GNUNET_ERROR_TYPE_DEBUG,
352 "connection send %s ack on %s\n",
353 fwd ? "FWD" : "BCK", GNUNET_h2s (&c->id));
355 /* Check if we need to transmit the ACK */
356 if (prev_fc->last_ack_sent - prev_fc->last_pid_recv > 3)
358 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer > 3\n");
359 LOG (GNUNET_ERROR_TYPE_DEBUG,
360 " last pid recv: %u, last ack sent: %u\n",
361 prev_fc->last_pid_recv, prev_fc->last_ack_sent);
365 /* Ok, ACK might be necessary, what PID to ACK? */
366 delta = next_fc->queue_max - next_fc->queue_n;
367 ack = prev_fc->last_pid_recv + delta;
368 LOG (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
369 LOG (GNUNET_ERROR_TYPE_DEBUG,
370 " last pid %u, last ack %u, qmax %u, q %u\n",
371 prev_fc->last_pid_recv, prev_fc->last_ack_sent,
372 next_fc->queue_max, next_fc->queue_n);
373 if (ack == prev_fc->last_ack_sent)
375 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
379 prev_fc->last_ack_sent = ack;
381 /* Build ACK message and send on connection */
382 msg.header.size = htons (sizeof (msg));
383 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK);
384 msg.ack = htonl (ack);
387 GMC_send_prebuilt_message (&msg.header, c, NULL, !fwd);
392 * Sends a CONNECTION ACK message in reponse to a received CONNECTION_CREATE
393 * or a first CONNECTION_ACK directed to us.
395 * @param connection Connection to confirm.
396 * @param fwd Is this a fwd ACK? (First is bck (SYNACK), second is fwd (ACK))
399 send_connection_ack (struct MeshConnection *connection, int fwd)
401 struct MeshTunnel3 *t;
404 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send connection ack\n");
406 GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK,
407 sizeof (struct GNUNET_MESH_ConnectionACK),
408 connection, NULL, fwd,
409 &message_sent, sizeof (struct GNUNET_MESH_ConnectionACK));
410 if (MESH_TUNNEL_NEW == t->state)
411 GMT_change_state (t, MESH_TUNNEL_WAITING);
412 if (MESH_CONNECTION_READY != connection->state)
413 GMC_change_state (connection, MESH_CONNECTION_SENT);
418 * Sends a CREATE CONNECTION message for a path to a peer.
419 * Changes the connection and tunnel states if necessary.
421 * @param connection Connection to create.
424 send_connection_create (struct MeshConnection *connection)
426 struct MeshTunnel3 *t;
429 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send connection create\n");
431 GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE,
432 sizeof (struct GNUNET_MESH_ConnectionCreate) +
433 (connection->path->length *
434 sizeof (struct GNUNET_PeerIdentity)),
439 (MESH_TUNNEL_SEARCHING == t->state || MESH_TUNNEL_NEW == t->state))
440 tunnel_change_state (t, MESH_TUNNEL_WAITING);
441 if (MESH_CONNECTION_NEW == connection->state)
442 connection_change_state (connection, MESH_CONNECTION_SENT);
447 connection_change_state (struct MeshConnection* c,
448 enum MeshConnectionState state)
450 LOG (GNUNET_ERROR_TYPE_DEBUG,
451 "Connection %s state was %s\n",
452 GNUNET_h2s (&c->id), GMC_state2s (c->state));
453 LOG (GNUNET_ERROR_TYPE_DEBUG,
454 "Connection %s state is now %s\n",
455 GNUNET_h2s (&c->id), GMC_state2s (state));
462 * Send keepalive packets for a connection.
464 * @param c Connection to keep alive..
465 * @param fwd Is this a FWD keepalive? (owner -> dest).
468 connection_keepalive (struct MeshConnection *c, int fwd)
470 struct GNUNET_MESH_ConnectionKeepAlive *msg;
471 size_t size = sizeof (struct GNUNET_MESH_ConnectionKeepAlive);
475 type = fwd ? GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE :
476 GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE;
478 LOG (GNUNET_ERROR_TYPE_DEBUG,
479 "sending %s keepalive for connection %s[%d]\n",
484 msg = (struct GNUNET_MESH_ConnectionKeepAlive *) cbuf;
485 msg->header.size = htons (size);
486 msg->header.type = htons (type);
489 send_prebuilt_message_connection (&msg->header, c, NULL, fwd);
494 * Send CONNECTION_{CREATE/ACK} packets for a connection.
496 * @param c Connection for which to send the message.
497 * @param fwd If GNUNET_YES, send CREATE, otherwise send ACK.
500 connection_recreate (struct MeshConnection *c, int fwd)
502 LOG (GNUNET_ERROR_TYPE_DEBUG, "sending connection recreate\n");
504 send_connection_create (c);
506 send_connection_ack (c, GNUNET_NO);
511 * Generic connection timer management.
512 * Depending on the role of the peer in the connection will send the
513 * appropriate message (build or keepalive)
515 * @param c Conncetion to maintain.
519 connection_maintain (struct MeshConnection *c, int fwd)
521 if (MESH_TUNNEL_SEARCHING == c->t->state)
523 /* TODO DHT GET with RO_BART */
528 case MESH_CONNECTION_NEW:
530 case MESH_CONNECTION_SENT:
531 connection_recreate (c, fwd);
533 case MESH_CONNECTION_READY:
534 connection_keepalive (c, fwd);
543 connection_fwd_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
545 struct MeshConnection *c = cls;
547 c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
548 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
551 connection_maintain (c, GNUNET_YES);
552 c->fwd_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
553 &connection_fwd_keepalive,
559 connection_bck_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
561 struct MeshConnection *c = cls;
563 c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
564 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
567 connection_maintain (c, GNUNET_NO);
568 c->bck_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
569 &connection_bck_keepalive,
576 * Get the previous hop in a connection
578 * @param c Connection.
580 * @return Previous peer in the connection.
582 static struct MeshPeer *
583 connection_get_prev_hop (struct MeshConnection *c)
587 if (0 == c->own_pos || c->path->length < 2)
588 id = c->path->peers[0];
590 id = c->path->peers[c->own_pos - 1];
592 return peer_get_short (id);
597 * Get the next hop in a connection
599 * @param c Connection.
601 * @return Next peer in the connection.
603 static struct MeshPeer *
604 connection_get_next_hop (struct MeshConnection *c)
608 if ((c->path->length - 1) == c->own_pos || c->path->length < 2)
609 id = c->path->peers[c->path->length - 1];
611 id = c->path->peers[c->own_pos + 1];
613 return peer_get_short (id);
618 * Get the hop in a connection.
620 * @param c Connection.
621 * @param fwd Next hop?
623 * @return Next peer in the connection.
625 static struct MeshPeer *
626 connection_get_hop (struct MeshConnection *c, int fwd)
629 return connection_get_next_hop (c);
630 return connection_get_prev_hop (c);
635 * Get the first transmittable message for a connection.
637 * @param c Connection.
638 * @param fwd Is this FWD?
640 * @return First transmittable message.
642 static struct MeshPeerQueue *
643 connection_get_first_message (struct MeshConnection *c, int fwd)
645 struct MeshPeerQueue *q;
648 p = connection_get_hop (c, fwd);
650 for (q = p->queue_head; NULL != q; q = q->next)
654 if (queue_is_sendable (q))
663 * @brief Re-initiate traffic on this connection if necessary.
665 * Check if there is traffic queued towards this peer
666 * and the core transmit handle is NULL (traffic was stalled).
667 * If so, call core tmt rdy.
669 * @param c Connection on which initiate traffic.
670 * @param fwd Is this about fwd traffic?
673 connection_unlock_queue (struct MeshConnection *c, int fwd)
675 struct MeshPeer *peer;
676 struct MeshPeerQueue *q;
679 LOG (GNUNET_ERROR_TYPE_DEBUG,
680 "connection_unlock_queue %s on %s\n",
681 fwd ? "FWD" : "BCK", GNUNET_h2s (&c->id));
683 if (GMC_is_terminal (c, fwd))
685 LOG (GNUNET_ERROR_TYPE_DEBUG, " is terminal!\n");
689 peer = connection_get_hop (c, fwd);
691 if (NULL != peer->core_transmit)
693 LOG (GNUNET_ERROR_TYPE_DEBUG, " already unlocked!\n");
694 return; /* Already unlocked */
697 q = connection_get_first_message (c, fwd);
700 LOG (GNUNET_ERROR_TYPE_DEBUG, " queue empty!\n");
701 return; /* Nothing to transmit */
705 peer->core_transmit =
706 GNUNET_CORE_notify_transmit_ready (core_handle,
709 GNUNET_TIME_UNIT_FOREVER_REL,
710 GNUNET_PEER_resolve2 (peer->id),
718 * Cancel all transmissions that belong to a certain connection.
720 * @param c Connection which to cancel.
721 * @param fwd Cancel fwd traffic?
724 connection_cancel_queues (struct MeshConnection *c, int fwd)
726 struct MeshPeerQueue *q;
727 struct MeshPeerQueue *next;
728 struct MeshFlowControl *fc;
729 struct MeshPeer *peer;
736 fc = fwd ? &c->fwd_fc : &c->bck_fc;
737 peer = connection_get_hop (c, fwd);
739 for (q = peer->queue_head; NULL != q; q = next)
744 LOG (GNUNET_ERROR_TYPE_DEBUG,
745 "connection_cancel_queue %s\n",
746 GNUNET_MESH_DEBUG_M2S (q->type));
747 queue_destroy (q, GNUNET_YES);
750 if (NULL == peer->queue_head)
752 if (NULL != peer->core_transmit)
754 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
755 peer->core_transmit = NULL;
757 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
759 GNUNET_SCHEDULER_cancel (fc->poll_task);
760 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
767 * Function called if a connection has been stalled for a while,
768 * possibly due to a missed ACK. Poll the neighbor about its ACK status.
770 * @param cls Closure (poll ctx).
771 * @param tc TaskContext.
774 connection_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
776 struct MeshFlowControl *fc = cls;
777 struct GNUNET_MESH_Poll msg;
778 struct MeshConnection *c;
780 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
781 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
787 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** Polling!\n");
788 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** connection [%X]\n",
789 GNUNET_h2s (&c->id));
790 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** %s\n",
791 fc == &c->fwd_fc ? "FWD" : "BCK");
793 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL);
794 msg.header.size = htons (sizeof (msg));
795 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** pid (%u)!\n", fc->last_pid_sent);
796 send_prebuilt_message_connection (&msg.header, c, NULL, fc == &c->fwd_fc);
797 fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
798 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
799 &connection_poll, fc);
804 * Timeout function due to lack of keepalive/traffic from the owner.
805 * Destroys connection if called.
807 * @param cls Closure (connection to destroy).
808 * @param tc TaskContext.
811 connection_fwd_timeout (void *cls,
812 const struct GNUNET_SCHEDULER_TaskContext *tc)
814 struct MeshConnection *c = cls;
816 c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
817 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
819 LOG (GNUNET_ERROR_TYPE_DEBUG,
820 "Connection %s[%X] FWD timed out. Destroying.\n",
824 if (GMC_is_origin (c, GNUNET_YES)) /* If local, leave. */
832 * Timeout function due to lack of keepalive/traffic from the destination.
833 * Destroys connection if called.
835 * @param cls Closure (connection to destroy).
836 * @param tc TaskContext
839 connection_bck_timeout (void *cls,
840 const struct GNUNET_SCHEDULER_TaskContext *tc)
842 struct MeshConnection *c = cls;
844 c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
845 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
848 LOG (GNUNET_ERROR_TYPE_DEBUG,
849 "Connection %s[%X] FWD timed out. Destroying.\n",
850 GMT_2s (c->t), c->id);
852 if (GMC_is_origin (c, GNUNET_NO)) /* If local, leave. */
860 * Resets the connection timeout task, some other message has done the
862 * - For the first peer on the direction this means to send
863 * a keepalive or a path confirmation message (either create or ACK).
864 * - For all other peers, this means to destroy the connection,
865 * due to lack of activity.
866 * Starts the tiemout if no timeout was running (connection just created).
868 * @param c Connection whose timeout to reset.
869 * @param fwd Is this forward?
871 * TODO use heap to improve efficiency of scheduler.
874 connection_reset_timeout (struct MeshConnection *c, int fwd)
876 GNUNET_SCHEDULER_TaskIdentifier *ti;
877 GNUNET_SCHEDULER_Task f;
879 ti = fwd ? &c->fwd_maintenance_task : &c->bck_maintenance_task;
881 if (GNUNET_SCHEDULER_NO_TASK != *ti)
882 GNUNET_SCHEDULER_cancel (*ti);
884 if (GMC_is_origin (c, fwd)) /* Endpoint */
886 f = fwd ? &connection_fwd_keepalive : &connection_bck_keepalive;
887 *ti = GNUNET_SCHEDULER_add_delayed (refresh_connection_time, f, c);
891 struct GNUNET_TIME_Relative delay;
893 delay = GNUNET_TIME_relative_multiply (refresh_connection_time, 4);
894 f = fwd ? &connection_fwd_timeout : &connection_bck_timeout;
895 *ti = GNUNET_SCHEDULER_add_delayed (delay, f, c);
901 * Add the connection to the list of both neighbors.
903 * @param c Connection.
906 register_neighbors (struct MeshConnection *c)
908 struct MeshPeer *peer;
910 peer = connection_get_next_hop (c);
911 if (GNUNET_NO == GMP_is_neighbor (peer))
916 GMP_add_connection (peer, c);
917 peer = connection_get_prev_hop (c);
918 if (GNUNET_NO == GMP_is_neighbor (peer))
923 GMP_add_connection (peer, c);
928 * Remove the connection from the list of both neighbors.
930 * @param c Connection.
933 unregister_neighbors (struct MeshConnection *c)
935 struct MeshPeer *peer;
937 peer = connection_get_next_hop (c);
938 GMP_remove_connection (peer, c);
940 peer = connection_get_prev_hop (c);
941 GMP_remove_connection (peer, c);
947 * Callback called when a queued message is sent.
949 * Calculates the average time
951 * @param cls Closure.
952 * @param c Connection this message was on.
953 * @param wait Time spent waiting for core (only the time for THIS message)
956 message_sent (void *cls,
957 struct MeshConnection *c,
958 struct GNUNET_TIME_Relative wait)
960 struct MeshConnectionPerformance *p;
961 size_t size = (size_t) cls;
965 return; /* Only endpoints are interested in this. */
968 usecsperbyte = ((double) wait.rel_value_us) / size;
969 if (p->size == AVG_MSGS)
971 /* Array is full. Substract oldest value, add new one and store. */
972 p->avg -= (p->usecsperbyte[p->idx] / AVG_MSGS);
973 p->usecsperbyte[p->idx] = usecsperbyte;
974 p->avg += (p->usecsperbyte[p->idx] / AVG_MSGS);
978 /* Array not yet full. Add current value to avg and store. */
979 p->usecsperbyte[p->idx] = usecsperbyte;
981 p->avg += p->usecsperbyte[p->idx];
985 p->idx = (p->idx + 1) % AVG_MSGS;
989 /******************************************************************************/
990 /******************************** API ***********************************/
991 /******************************************************************************/
994 * Core handler for connection creation.
996 * @param cls Closure (unused).
997 * @param peer Sender (neighbor).
998 * @param message Message.
1000 * @return GNUNET_OK to keep the connection open,
1001 * GNUNET_SYSERR to close it (signal serious error)
1004 GMC_handle_create (void *cls, const struct GNUNET_PeerIdentity *peer,
1005 const struct GNUNET_MessageHeader *message)
1007 struct GNUNET_MESH_ConnectionCreate *msg;
1008 struct GNUNET_PeerIdentity *id;
1009 struct GNUNET_HashCode *cid;
1010 struct MeshPeerPath *path;
1011 struct MeshPeer *dest_peer;
1012 struct MeshPeer *orig_peer;
1013 struct MeshConnection *c;
1014 unsigned int own_pos;
1018 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1019 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received a connection create msg\n");
1022 size = ntohs (message->size);
1023 if (size < sizeof (struct GNUNET_MESH_ConnectionCreate))
1025 GNUNET_break_op (0);
1029 /* Calculate hops */
1030 size -= sizeof (struct GNUNET_MESH_ConnectionCreate);
1031 if (size % sizeof (struct GNUNET_PeerIdentity))
1033 GNUNET_break_op (0);
1036 size /= sizeof (struct GNUNET_PeerIdentity);
1039 GNUNET_break_op (0);
1042 LOG (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
1044 /* Get parameters */
1045 msg = (struct GNUNET_MESH_ConnectionCreate *) message;
1047 id = (struct GNUNET_PeerIdentity *) &msg[1];
1048 LOG (GNUNET_ERROR_TYPE_DEBUG,
1049 " connection %s (%s).\n",
1050 GNUNET_h2s (cid), GNUNET_i2s (id));
1052 /* Create connection */
1053 c = connection_get (cid);
1057 LOG (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
1058 path = path_new (size);
1060 for (i = 0; i < size; i++)
1062 LOG (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n",
1063 GNUNET_i2s (&id[i]));
1064 path->peers[i] = GNUNET_PEER_intern (&id[i]);
1065 if (path->peers[i] == my_short_id)
1068 if (own_pos == 0 && path->peers[own_pos] != myid)
1070 /* create path: self not found in path through self */
1071 GNUNET_break_op (0);
1072 path_destroy (path);
1076 LOG (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
1077 path_add_to_peers (path, GNUNET_NO);
1078 LOG (GNUNET_ERROR_TYPE_DEBUG, " Creating connection\n");
1079 c = GMC_new (cid, NULL, path_duplicate (path), own_pos);
1082 connection_reset_timeout (c, GNUNET_YES);
1088 if (MESH_CONNECTION_NEW == c->state)
1089 connection_change_state (c, MESH_CONNECTION_SENT);
1091 /* Remember peers */
1092 dest_peer = peer_get (&id[size - 1]);
1093 orig_peer = peer_get (&id[0]);
1095 /* Is it a connection to us? */
1096 if (c->own_pos == size - 1)
1098 LOG (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
1099 peer_add_path_to_origin (orig_peer, path, GNUNET_YES);
1101 if (NULL == orig_peer->tunnel)
1103 orig_peer->tunnel = tunnel_new ();
1104 orig_peer->tunnel->peer = orig_peer;
1106 GMT_add_connection (orig_peer->tunnel, c);
1107 if (MESH_TUNNEL_NEW == GMT_get_state (c->t))
1108 GMT_change_state (c->t, MESH_TUNNEL_WAITING);
1110 send_connection_ack (c, GNUNET_NO);
1111 if (MESH_CONNECTION_SENT == c->state)
1112 connection_change_state (c, MESH_CONNECTION_ACK);
1114 /* Keep tunnel alive in direction dest->owner*/
1115 connection_reset_timeout (c, GNUNET_NO);
1119 /* It's for somebody else! Retransmit. */
1120 LOG (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
1121 peer_add_path (dest_peer, path_duplicate (path), GNUNET_NO);
1122 peer_add_path_to_origin (orig_peer, path, GNUNET_NO);
1123 GMC_send_prebuilt_message (message, c, NULL, GNUNET_YES);
1130 * Core handler for path confirmations.
1132 * @param cls closure
1133 * @param message message
1134 * @param peer peer identity this notification is about
1136 * @return GNUNET_OK to keep the connection open,
1137 * GNUNET_SYSERR to close it (signal serious error)
1140 GMC_handle_confirm (void *cls, const struct GNUNET_PeerIdentity *peer,
1141 const struct GNUNET_MessageHeader *message)
1143 struct GNUNET_MESH_ConnectionACK *msg;
1144 struct MeshConnection *c;
1145 struct MeshPeerPath *p;
1146 struct MeshPeer *pi;
1149 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1150 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received a connection ACK msg\n");
1151 msg = (struct GNUNET_MESH_ConnectionACK *) message;
1152 LOG (GNUNET_ERROR_TYPE_DEBUG, " on connection %s\n",
1153 GNUNET_h2s (&msg->cid));
1154 c = connection_get (&msg->cid);
1157 GNUNET_STATISTICS_update (stats, "# control on unknown connection",
1159 LOG (GNUNET_ERROR_TYPE_DEBUG, " don't know the connection!\n");
1164 LOG (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n",
1166 pi = peer_get (peer);
1167 if (connection_get_next_hop (c) == pi)
1169 LOG (GNUNET_ERROR_TYPE_DEBUG, " SYNACK\n");
1171 if (MESH_CONNECTION_SENT == c->state)
1172 connection_change_state (c, MESH_CONNECTION_ACK);
1174 else if (connection_get_prev_hop (c) == pi)
1176 LOG (GNUNET_ERROR_TYPE_DEBUG, " ACK\n");
1178 connection_change_state (c, MESH_CONNECTION_READY);
1182 GNUNET_break_op (0);
1185 connection_reset_timeout (c, fwd);
1187 /* Add path to peers? */
1191 path_add_to_peers (p, GNUNET_YES);
1198 /* Message for us as creator? */
1199 if (GMC_is_origin (c, GNUNET_YES))
1201 LOG (GNUNET_ERROR_TYPE_DEBUG, " Connection (SYN)ACK for us!\n");
1202 connection_change_state (c, MESH_CONNECTION_READY);
1203 GMT_change_state (c->t, MESH_TUNNEL_READY);
1204 send_connection_ack (c, GNUNET_YES);
1205 GMT_send_queued_data (c->t, GNUNET_YES);
1209 /* Message for us as destination? */
1210 if (GMC_is_terminal (c, GNUNET_YES))
1212 LOG (GNUNET_ERROR_TYPE_DEBUG, " Connection ACK for us!\n");
1213 GMC_change_state (c, MESH_CONNECTION_READY);
1214 GMT_change_state (c->t, MESH_TUNNEL_READY);
1215 GMT_send_queued_data (c->t, GNUNET_NO);
1219 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
1220 GMC_send_prebuilt_message (message, c, NULL, fwd);
1226 * Core handler for notifications of broken paths
1228 * @param cls Closure (unused).
1229 * @param peer Peer identity of sending neighbor.
1230 * @param message Message.
1232 * @return GNUNET_OK to keep the connection open,
1233 * GNUNET_SYSERR to close it (signal serious error)
1236 GMC_handle_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
1237 const struct GNUNET_MessageHeader *message)
1239 struct GNUNET_MESH_ConnectionBroken *msg;
1240 struct MeshConnection *c;
1242 LOG (GNUNET_ERROR_TYPE_DEBUG,
1243 "Received a CONNECTION BROKEN msg from %s\n", GNUNET_i2s (peer));
1244 msg = (struct GNUNET_MESH_ConnectionBroken *) message;
1245 LOG (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
1246 GNUNET_i2s (&msg->peer1));
1247 LOG (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
1248 GNUNET_i2s (&msg->peer2));
1249 c = connection_get (&msg->cid);
1252 GNUNET_break_op (0);
1255 tunnel_notify_connection_broken (c->t, GNUNET_PEER_search (&msg->peer1),
1256 GNUNET_PEER_search (&msg->peer2));
1263 * Core handler for tunnel destruction
1265 * @param cls Closure (unused).
1266 * @param peer Peer identity of sending neighbor.
1267 * @param message Message.
1269 * @return GNUNET_OK to keep the connection open,
1270 * GNUNET_SYSERR to close it (signal serious error)
1273 GMC_handle_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
1274 const struct GNUNET_MessageHeader *message)
1276 struct GNUNET_MESH_ConnectionDestroy *msg;
1277 struct MeshConnection *c;
1281 msg = (struct GNUNET_MESH_ConnectionDestroy *) message;
1282 LOG (GNUNET_ERROR_TYPE_DEBUG,
1283 "Got a CONNECTION DESTROY message from %s\n",
1285 LOG (GNUNET_ERROR_TYPE_DEBUG,
1286 " for connection %s\n",
1287 GNUNET_h2s (&msg->cid));
1288 c = connection_get (&msg->cid);
1291 /* Probably already got the message from another path,
1292 * destroyed the tunnel and retransmitted to children.
1295 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel",
1299 id = GNUNET_PEER_search (peer);
1300 if (id == GMP_get_short_id (connection_get_prev_hop (c)))
1302 else if (id == GMP_get_short_id (connection_get_next_hop (c)))
1306 GNUNET_break_op (0);
1309 GMC_send_prebuilt_message (message, c, NULL, fwd);
1310 c->destroy = GNUNET_YES;
1316 * Generic handler for mesh network encrypted traffic.
1318 * @param peer Peer identity this notification is about.
1319 * @param message Encrypted message.
1320 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
1322 * @return GNUNET_OK to keep the connection open,
1323 * GNUNET_SYSERR to close it (signal serious error)
1326 handle_mesh_encrypted (const struct GNUNET_PeerIdentity *peer,
1327 const struct GNUNET_MESH_Encrypted *msg,
1330 struct MeshConnection *c;
1331 struct MeshTunnel3 *t;
1332 struct MeshPeer *neighbor;
1333 struct MeshFlowControl *fc;
1340 size = ntohs (msg->header.size);
1342 sizeof (struct GNUNET_MESH_Encrypted) +
1343 sizeof (struct GNUNET_MessageHeader))
1345 GNUNET_break_op (0);
1348 type = ntohs (msg->header.type);
1349 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1350 LOG (GNUNET_ERROR_TYPE_DEBUG, "got a %s message from %s\n",
1351 GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer));
1353 /* Check connection */
1354 c = connection_get (&msg->cid);
1357 GNUNET_STATISTICS_update (stats, "# unknown connection", 1, GNUNET_NO);
1358 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING connection unknown\n");
1362 fc = fwd ? &c->bck_fc : &c->fwd_fc;
1364 /* Check if origin is as expected */
1365 neighbor = connection_get_hop (c, !fwd);
1366 if (GNUNET_PEER_search (peer) != GMP_get_short_id (neighbor))
1368 GNUNET_break_op (0);
1373 pid = ntohl (msg->pid);
1374 if (GMC_is_pid_bigger (pid, fc->last_ack_sent))
1376 GNUNET_STATISTICS_update (stats, "# unsolicited message", 1, GNUNET_NO);
1377 LOG (GNUNET_ERROR_TYPE_DEBUG,
1378 "WARNING Received PID %u, (prev %u), ACK %u\n",
1379 pid, fc->last_pid_recv, fc->last_ack_sent);
1382 if (GNUNET_NO == GMC_is_pid_bigger (pid, fc->last_pid_recv))
1384 GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO);
1385 LOG (GNUNET_ERROR_TYPE_DEBUG,
1386 " Pid %u not expected (%u+), dropping!\n",
1387 pid, fc->last_pid_recv + 1);
1390 if (MESH_CONNECTION_SENT == c->state)
1391 connection_change_state (c, MESH_CONNECTION_READY);
1392 connection_reset_timeout (c, fwd);
1393 fc->last_pid_recv = pid;
1395 /* Is this message for us? */
1396 if (GMC_is_terminal (c, fwd))
1398 size_t dsize = size - sizeof (struct GNUNET_MESH_Encrypted);
1400 struct GNUNET_MessageHeader *msgh;
1403 /* TODO signature verification */
1404 LOG (GNUNET_ERROR_TYPE_DEBUG, " message for us!\n");
1405 GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO);
1407 fc->last_pid_recv = pid;
1408 tunnel_decrypt (t, cbuf, &msg[1], dsize, msg->iv, fwd);
1412 msgh = (struct GNUNET_MessageHeader *) &cbuf[off];
1413 handle_decrypted (t, msgh, fwd);
1414 off += ntohs (msgh->size);
1416 send_ack (c, NULL, fwd);
1420 /* Message not for us: forward to next hop */
1421 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
1422 ttl = ntohl (msg->ttl);
1423 LOG (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
1426 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
1427 LOG (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
1428 send_ack (c, NULL, fwd);
1431 GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
1433 send_prebuilt_message_connection (&msg->header, c, NULL, fwd);
1440 * Core handler for mesh network traffic going orig->dest.
1442 * @param cls Closure (unused).
1443 * @param message Message received.
1444 * @param peer Peer who sent the message.
1446 * @return GNUNET_OK to keep the connection open,
1447 * GNUNET_SYSERR to close it (signal serious error)
1450 GMC_handle_fwd (void *cls, const struct GNUNET_PeerIdentity *peer,
1451 const struct GNUNET_MessageHeader *message)
1453 return handle_mesh_encrypted (peer,
1454 (struct GNUNET_MESH_Encrypted *)message,
1459 * Core handler for mesh network traffic going dest->orig.
1461 * @param cls Closure (unused).
1462 * @param message Message received.
1463 * @param peer Peer who sent the message.
1465 * @return GNUNET_OK to keep the connection open,
1466 * GNUNET_SYSERR to close it (signal serious error)
1469 GMC_handle_bck (void *cls, const struct GNUNET_PeerIdentity *peer,
1470 const struct GNUNET_MessageHeader *message)
1472 return handle_mesh_encrypted (peer,
1473 (struct GNUNET_MESH_Encrypted *)message,
1479 * Core handler for mesh network traffic point-to-point acks.
1481 * @param cls closure
1482 * @param message message
1483 * @param peer peer identity this notification is about
1485 * @return GNUNET_OK to keep the connection open,
1486 * GNUNET_SYSERR to close it (signal serious error)
1489 GMC_handle_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
1490 const struct GNUNET_MessageHeader *message)
1492 struct GNUNET_MESH_ACK *msg;
1493 struct MeshConnection *c;
1494 struct MeshFlowControl *fc;
1499 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1500 LOG (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
1502 msg = (struct GNUNET_MESH_ACK *) message;
1504 c = connection_get (&msg->cid);
1508 GNUNET_STATISTICS_update (stats, "# ack on unknown connection", 1,
1513 /* Is this a forward or backward ACK? */
1514 id = GNUNET_PEER_search (peer);
1515 if (GMP_get_short_id (connection_get_next_hop (c)) == id)
1517 LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
1521 else if (GMP_get_short_id (connection_get_prev_hop (c)) == id)
1523 LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
1529 GNUNET_break_op (0);
1533 ack = ntohl (msg->ack);
1534 LOG (GNUNET_ERROR_TYPE_DEBUG, " ACK %u (was %u)\n",
1535 ack, fc->last_ack_recv);
1536 if (GMC_is_pid_bigger (ack, fc->last_ack_recv))
1537 fc->last_ack_recv = ack;
1539 /* Cancel polling if the ACK is big enough. */
1540 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task &&
1541 GMC_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
1543 LOG (GNUNET_ERROR_TYPE_DEBUG, " Cancel poll\n");
1544 GNUNET_SCHEDULER_cancel (fc->poll_task);
1545 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
1546 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
1549 connection_unlock_queue (c, fwd);
1556 * Core handler for mesh network traffic point-to-point ack polls.
1558 * @param cls closure
1559 * @param message message
1560 * @param peer peer identity this notification is about
1562 * @return GNUNET_OK to keep the connection open,
1563 * GNUNET_SYSERR to close it (signal serious error)
1566 GMC_handle_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
1567 const struct GNUNET_MessageHeader *message)
1569 struct GNUNET_MESH_Poll *msg;
1570 struct MeshConnection *c;
1571 struct MeshFlowControl *fc;
1576 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1577 LOG (GNUNET_ERROR_TYPE_DEBUG, "Got a POLL packet from %s!\n",
1580 msg = (struct GNUNET_MESH_Poll *) message;
1582 c = connection_get (&msg->cid);
1586 GNUNET_STATISTICS_update (stats, "# poll on unknown connection", 1,
1588 GNUNET_break_op (0);
1592 /* Is this a forward or backward ACK?
1593 * Note: a poll should never be needed in a loopback case,
1594 * since there is no possiblility of packet loss there, so
1595 * this way of discerining FWD/BCK should not be a problem.
1597 id = GNUNET_PEER_search (peer);
1598 if (GMP_get_short_id (connection_get_next_hop (c)) == id)
1600 LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
1603 else if (GMP_get_short_id (connection_get_prev_hop (c)) == id)
1605 LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
1610 GNUNET_break_op (0);
1614 pid = ntohl (msg->pid);
1615 LOG (GNUNET_ERROR_TYPE_DEBUG, " PID %u, OLD %u\n",
1616 pid, fc->last_pid_recv);
1617 fc->last_pid_recv = pid;
1618 fwd = fc == &c->fwd_fc;
1619 send_ack (c, NULL, fwd);
1626 * Core handler for mesh keepalives.
1628 * @param cls closure
1629 * @param message message
1630 * @param peer peer identity this notification is about
1631 * @return GNUNET_OK to keep the connection open,
1632 * GNUNET_SYSERR to close it (signal serious error)
1634 * TODO: Check who we got this from, to validate route.
1637 GMC_handle_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
1638 const struct GNUNET_MessageHeader *message)
1640 struct GNUNET_MESH_ConnectionKeepAlive *msg;
1641 struct MeshConnection *c;
1642 struct MeshPeer *neighbor;
1645 msg = (struct GNUNET_MESH_ConnectionKeepAlive *) message;
1646 LOG (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
1649 c = connection_get (&msg->cid);
1652 GNUNET_STATISTICS_update (stats, "# keepalive on unknown connection", 1,
1657 fwd = GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE == ntohs (message->type) ?
1658 GNUNET_YES : GNUNET_NO;
1660 /* Check if origin is as expected */
1661 neighbor = connection_get_hop (c, fwd);
1662 if (GNUNET_PEER_search (peer) != GMP_get_short_id (neighbor))
1664 GNUNET_break_op (0);
1668 connection_change_state (c, MESH_CONNECTION_READY);
1669 connection_reset_timeout (c, fwd);
1671 if (GMC_is_terminal (c, fwd))
1674 GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
1675 GMC_send_prebuilt_message (message, c, NULL, fwd);
1682 * Send an ACK on the appropriate connection/channel, depending on
1683 * the direction and the position of the peer.
1685 * @param c Which connection to send the hop-by-hop ACK.
1686 * @param ch Channel, if any.
1687 * @param fwd Is this a fwd ACK? (will go dest->root)
1690 GMC_send_ack (struct MeshConnection *c, struct MeshChannel *ch, int fwd)
1692 unsigned int buffer;
1694 LOG (GNUNET_ERROR_TYPE_DEBUG,
1695 "send ack %s on %p %p\n",
1696 fwd ? "FWD" : "BCK", c, ch);
1697 if (NULL == c || GMC_is_terminal (c, fwd))
1699 struct MeshTunnel3 *t;
1700 LOG (GNUNET_ERROR_TYPE_DEBUG, " getting from all connections\n");
1701 t = (NULL == c) ? GMCH_get_tunnel (ch) : GMC_get_tunnel (c);
1702 buffer = GMT_get_buffer (t, fwd);
1706 LOG (GNUNET_ERROR_TYPE_DEBUG, " getting from one connection\n");
1707 buffer = GMC_get_buffer (c, fwd);
1709 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer available: %u\n", buffer);
1711 if ( (NULL != ch && GMCH_is_origin (ch, fwd)) ||
1712 (NULL != c && GMC_is_origin (c, fwd)) )
1714 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on channel...\n");
1717 GNUNET_assert (NULL != ch);
1718 LOG (GNUNET_ERROR_TYPE_DEBUG, " really sending!\n");
1719 send_local_ack (ch, fwd);
1724 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on all connections\n");
1725 GNUNET_assert (NULL != ch);
1726 channel_send_connections_ack (ch, buffer, fwd);
1730 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on connection\n");
1731 connection_send_ack (c, buffer, fwd);
1737 * Initialize the connections subsystem
1739 * @param c Configuration handle.
1742 GMC_init (const struct GNUNET_CONFIGURATION_Handle *c)
1745 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
1748 LOG_config_invalid (GNUNET_ERROR_TYPE_ERROR,
1749 "MESH", "MAX_MSGS_QUEUE", "MISSING");
1750 GNUNET_SCHEDULER_shutdown ();
1755 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_CONNECTIONS",
1758 LOG_config_invalid (GNUNET_ERROR_TYPE_ERROR,
1759 "MESH", "MAX_CONNECTIONS", "MISSING");
1760 GNUNET_SCHEDULER_shutdown ();
1765 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_CONNECTION_TIME",
1766 &refresh_connection_time))
1768 LOG_config_invalid (GNUNET_ERROR_TYPE_ERROR,
1769 "MESH", "REFRESH_CONNECTION_TIME", "MISSING");
1770 GNUNET_SCHEDULER_shutdown ();
1773 connections = GNUNET_CONTAINER_multihashmap_create (1024, GNUNET_YES);
1777 * Shut down the connections subsystem.
1785 struct MeshConnection *
1786 GMC_new (const struct GNUNET_HashCode *cid,
1787 struct MeshTunnel3 *t,
1788 struct MeshPeerPath *p,
1789 unsigned int own_pos)
1791 struct MeshConnection *c;
1793 c = GNUNET_new (struct MeshConnection);
1795 GNUNET_CONTAINER_multihashmap_put (connections, &c->id, c,
1796 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
1797 fc_init (&c->fwd_fc);
1798 fc_init (&c->bck_fc);
1803 if (own_pos > p->length - 1)
1809 c->own_pos = own_pos;
1814 c->fwd_maintenance_task =
1815 GNUNET_SCHEDULER_add_delayed (refresh_connection_time,
1816 &connection_fwd_keepalive, c);
1818 register_neighbors (c);
1824 GMC_destroy (struct MeshConnection *c)
1826 struct MeshPeer *peer;
1831 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying connection %s\n",
1832 GNUNET_h2s (&c->id));
1834 /* Cancel all traffic */
1835 connection_cancel_queues (c, GNUNET_YES);
1836 connection_cancel_queues (c, GNUNET_NO);
1838 /* Cancel maintainance task (keepalive/timeout) */
1839 if (GNUNET_SCHEDULER_NO_TASK != c->fwd_maintenance_task)
1840 GNUNET_SCHEDULER_cancel (c->fwd_maintenance_task);
1841 if (GNUNET_SCHEDULER_NO_TASK != c->bck_maintenance_task)
1842 GNUNET_SCHEDULER_cancel (c->bck_maintenance_task);
1844 /* Unregister from neighbors */
1845 unregister_neighbors (c);
1848 GNUNET_STATISTICS_update (stats, "# connections", -1, GNUNET_NO);
1849 GMT_remove_connection (c->t, c);
1854 * Get the connection ID.
1856 * @param c Connection to get the ID from.
1858 * @return ID of the connection.
1860 const struct GNUNET_HashCode *
1861 GMC_get_id (const struct MeshConnection *c)
1868 * Get the connection state.
1870 * @param c Connection to get the state from.
1872 * @return state of the connection.
1874 enum MeshConnectionState
1875 GMC_get_state (const struct MeshConnection *c)
1881 * Get the connection tunnel.
1883 * @param c Connection to get the tunnel from.
1885 * @return tunnel of the connection.
1887 struct MeshTunnel3 *
1888 GMC_get_tunnel (const struct MeshConnection *c)
1895 * Get free buffer space in a connection.
1897 * @param c Connection.
1898 * @param fwd Is query about FWD traffic?
1900 * @return Free buffer space [0 - max_msgs_queue/max_connections]
1903 GMC_get_buffer (struct MeshConnection *c, int fwd)
1905 struct MeshFlowControl *fc;
1907 fc = fwd ? &c->fwd_fc : &c->bck_fc;
1909 return (fc->queue_max - fc->queue_n);
1913 * Get messages queued in a connection.
1915 * @param c Connection.
1916 * @param fwd Is query about FWD traffic?
1918 * @return Number of messages queued.
1921 GMC_get_qn (struct MeshConnection *c, int fwd)
1923 struct MeshFlowControl *fc;
1925 fc = fwd ? &c->fwd_fc : &c->bck_fc;
1932 * Notify other peers on a connection of a broken link. Mark connections
1933 * to destroy after all traffic has been sent.
1935 * @param c Connection on which there has been a disconnection.
1936 * @param peer Peer that disconnected.
1937 * @param my_full_id My ID (to send to other peers).
1940 GMC_notify_broken (struct MeshConnection *c,
1941 struct MeshPeer *peer,
1942 struct GNUNET_PeerIdentity *my_full_id)
1944 struct GNUNET_MESH_ConnectionBroken msg;
1947 fwd = peer == connection_get_prev_hop (c);
1949 connection_cancel_queues (c, !fwd);
1950 if (GMC_is_terminal (c, fwd))
1952 /* Local shutdown, no one to notify about this. */
1957 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectionBroken));
1958 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN);
1960 msg.peer1 = *my_full_id;
1961 msg.peer2 = *GMP_get_id (peer);
1962 GMC_send_prebuilt_message (&msg.header, c, NULL, fwd);
1963 c->destroy = GNUNET_YES;
1970 * Is this peer the first one on the connection?
1972 * @param c Connection.
1973 * @param fwd Is this about fwd traffic?
1975 * @return GNUNET_YES if origin, GNUNET_NO if relay/terminal.
1978 GMC_is_origin (struct MeshConnection *c, int fwd)
1980 if (!fwd && c->path->length - 1 == c->own_pos )
1982 if (fwd && 0 == c->own_pos)
1989 * Is this peer the last one on the connection?
1991 * @param c Connection.
1992 * @param fwd Is this about fwd traffic?
1993 * Note that the ROOT is the terminal for BCK traffic!
1995 * @return GNUNET_YES if terminal, GNUNET_NO if relay/origin.
1998 GMC_is_terminal (struct MeshConnection *c, int fwd)
2000 return GMC_is_origin (c, !fwd);
2005 * Sends an already built message on a connection, properly registering
2006 * all used resources.
2008 * @param message Message to send. Function makes a copy of it.
2009 * If message is not hop-by-hop, decrements TTL of copy.
2010 * @param c Connection on which this message is transmitted.
2011 * @param ch Channel on which this message is transmitted, or NULL.
2012 * @param fwd Is this a fwd message?
2015 GMC_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
2016 struct MeshConnection *c,
2017 struct MeshChannel *ch,
2024 size = ntohs (message->size);
2025 data = GNUNET_malloc (size);
2026 memcpy (data, message, size);
2027 type = ntohs (message->type);
2028 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send %s (%u) on connection %s\n",
2029 GNUNET_MESH_DEBUG_M2S (type), size, GNUNET_h2s (&c->id));
2033 struct GNUNET_MESH_Encrypted *emsg;
2034 struct GNUNET_MESH_ACK *amsg;
2035 struct GNUNET_MESH_Poll *pmsg;
2036 struct GNUNET_MESH_ConnectionDestroy *dmsg;
2037 struct GNUNET_MESH_ConnectionBroken *bmsg;
2040 case GNUNET_MESSAGE_TYPE_MESH_FWD:
2041 case GNUNET_MESSAGE_TYPE_MESH_BCK:
2042 emsg = (struct GNUNET_MESH_Encrypted *) data;
2043 ttl = ntohl (emsg->ttl);
2046 GNUNET_break_op (0);
2050 emsg->ttl = htonl (ttl - 1);
2051 emsg->pid = htonl (fwd ? c->fwd_fc.next_pid++ : c->bck_fc.next_pid++);
2052 LOG (GNUNET_ERROR_TYPE_DEBUG, " pid %u\n", ntohl (emsg->pid));
2055 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2056 amsg = (struct GNUNET_MESH_ACK *) data;
2058 LOG (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", ntohl (amsg->ack));
2061 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2062 pmsg = (struct GNUNET_MESH_Poll *) data;
2064 pmsg->pid = htonl (fwd ? c->fwd_fc.last_pid_sent : c->bck_fc.last_pid_sent);
2065 LOG (GNUNET_ERROR_TYPE_DEBUG, " poll %u\n", ntohl (pmsg->pid));
2068 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
2069 dmsg = (struct GNUNET_MESH_ConnectionDestroy *) data;
2074 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
2075 bmsg = (struct GNUNET_MESH_ConnectionBroken *) data;
2080 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
2081 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
2088 GMP_queue_add (data, type, size, c, ch, fwd, &message_sent, (void *) size);
2093 * Send a message to all peers in this connection that the connection
2094 * is no longer valid.
2096 * If some peer should not receive the message, it should be zero'ed out
2097 * before calling this function.
2099 * @param c The connection whose peers to notify.
2102 GMC_send_destroy (struct MeshConnection *c)
2104 struct GNUNET_MESH_ConnectionDestroy msg;
2106 if (GNUNET_YES == c->destroy)
2109 msg.header.size = htons (sizeof (msg));
2110 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);;
2112 LOG (GNUNET_ERROR_TYPE_DEBUG,
2113 " sending connection destroy for connection %s\n",
2114 GNUNET_h2s (&c->id));
2116 if (GNUNET_NO == GMC_is_terminal (c, GNUNET_YES))
2117 GMC_send_prebuilt_message (&msg.header, c, NULL, GNUNET_YES);
2118 if (GNUNET_NO == GMC_is_terminal (c, GNUNET_NO))
2119 GMC_send_prebuilt_message (&msg.header, c, NULL, GNUNET_NO);
2120 c->destroy = GNUNET_YES;