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.
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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 * Was this a forced message? (Do not account for it)
230 * Continuation to call once sent.
235 * Closure for @c cont.
240 /******************************************************************************/
241 /******************************* GLOBALS ***********************************/
242 /******************************************************************************/
245 * Global handle to the statistics service.
247 extern struct GNUNET_STATISTICS_Handle *stats;
250 * Local peer own ID (memory efficient handle).
252 extern GNUNET_PEER_Id myid;
255 * Local peer own ID (full value).
257 extern struct GNUNET_PeerIdentity my_full_id;
260 * Connections known, indexed by cid (MeshConnection).
262 static struct GNUNET_CONTAINER_MultiHashMap *connections;
265 * How many connections are we willing to maintain.
266 * Local connections are always allowed, even if there are more connections than max.
268 static unsigned long long max_connections;
271 * How many messages *in total* are we willing to queue, divide by number of
272 * connections to get connection queue size.
274 static unsigned long long max_msgs_queue;
277 * How often to send path keepalives. Paths timeout after 4 missed.
279 static struct GNUNET_TIME_Relative refresh_connection_time;
282 * How often to send path create / ACKs.
284 static struct GNUNET_TIME_Relative create_connection_time;
287 /******************************************************************************/
288 /******************************** STATIC ***********************************/
289 /******************************************************************************/
291 #if 0 // avoid compiler warning for unused static function
293 fc_debug (struct MeshFlowControl *fc)
295 LOG (GNUNET_ERROR_TYPE_DEBUG, " IN: %u/%u\n",
296 fc->last_pid_recv, fc->last_ack_sent);
297 LOG (GNUNET_ERROR_TYPE_DEBUG, " OUT: %u/%u\n",
298 fc->last_pid_sent, fc->last_ack_recv);
299 LOG (GNUNET_ERROR_TYPE_DEBUG, " QUEUE: %u/%u\n",
300 fc->queue_n, fc->queue_max);
304 connection_debug (struct MeshConnection *c)
308 LOG (GNUNET_ERROR_TYPE_DEBUG, "*** DEBUG NULL CONNECTION ***\n");
311 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connection %s:%X\n",
312 peer2s (c->t->peer), GMC_2s (c));
313 LOG (GNUNET_ERROR_TYPE_DEBUG, " state: %u, pending msgs: %u\n",
314 c->state, c->pending_messages);
315 LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD FC\n");
316 fc_debug (&c->fwd_fc);
317 LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK FC\n");
318 fc_debug (&c->bck_fc);
323 * Get string description for tunnel state.
325 * @param s Tunnel state.
327 * @return String representation.
330 GMC_state2s (enum MeshConnectionState s)
334 case MESH_CONNECTION_NEW:
335 return "MESH_CONNECTION_NEW";
336 case MESH_CONNECTION_SENT:
337 return "MESH_CONNECTION_SENT";
338 case MESH_CONNECTION_ACK:
339 return "MESH_CONNECTION_ACK";
340 case MESH_CONNECTION_READY:
341 return "MESH_CONNECTION_READY";
342 case MESH_CONNECTION_DESTROYED:
343 return "MESH_CONNECTION_DESTROYED";
345 return "MESH_CONNECTION_STATE_ERROR";
351 * Initialize a Flow Control structure to the initial state.
353 * @param fc Flow Control structure to initialize.
356 fc_init (struct MeshFlowControl *fc)
359 fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
360 fc->last_pid_recv = (uint32_t) -1;
361 fc->last_ack_sent = (uint32_t) 0;
362 fc->last_ack_recv = (uint32_t) 0;
363 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
364 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
366 fc->queue_max = (max_msgs_queue / max_connections) + 1;
373 * @param cid Connection ID.
375 static struct MeshConnection *
376 connection_get (const struct GNUNET_HashCode *cid)
378 return GNUNET_CONTAINER_multihashmap_get (connections, cid);
383 connection_change_state (struct MeshConnection* c,
384 enum MeshConnectionState state)
386 LOG (GNUNET_ERROR_TYPE_DEBUG,
387 "Connection %s state was %s\n",
388 GMC_2s (c), GMC_state2s (c->state));
389 if (MESH_CONNECTION_DESTROYED == c->state)
391 LOG (GNUNET_ERROR_TYPE_DEBUG, "state not changing anymore\n");
394 LOG (GNUNET_ERROR_TYPE_DEBUG,
395 "Connection %s state is now %s\n",
396 GMC_2s (c), GMC_state2s (state));
402 * Callback called when a queued ACK message is sent.
404 * @param cls Closure (FC).
405 * @param c Connection this message was on.
406 * @param q Queue handler this call invalidates.
407 * @param type Type of message sent.
408 * @param fwd Was this a FWD going message?
409 * @param size Size of the message.
413 struct MeshConnection *c,
414 struct MeshConnectionQueue *q,
415 uint16_t type, int fwd, size_t size)
417 struct MeshFlowControl *fc = cls;
424 * Send an ACK on the connection, informing the predecessor about
425 * the available buffer space. Should not be called in case the peer
426 * is origin (no predecessor) in the @c fwd direction.
428 * Note that for fwd ack, the FWD mean forward *traffic* (root->dest),
429 * the ACK itself goes "back" (dest->root).
431 * @param c Connection on which to send the ACK.
432 * @param buffer How much space free to advertise?
433 * @param fwd Is this FWD ACK? (Going dest -> root)
434 * @param force Don't optimize out.
437 send_ack (struct MeshConnection *c, unsigned int buffer, int fwd, int force)
439 struct MeshFlowControl *next_fc;
440 struct MeshFlowControl *prev_fc;
441 struct GNUNET_MESH_ACK msg;
445 /* If origin, there is no connection to send ACKs. Wrong function! */
446 if (GMC_is_origin (c, fwd))
452 next_fc = fwd ? &c->fwd_fc : &c->bck_fc;
453 prev_fc = fwd ? &c->bck_fc : &c->fwd_fc;
455 LOG (GNUNET_ERROR_TYPE_DEBUG,
456 "connection send %s ack on %s\n",
457 GM_f2s (fwd), GMC_2s (c));
459 /* Check if we need to transmit the ACK. */
460 delta = prev_fc->last_ack_sent - prev_fc->last_pid_recv;
461 if (3 < delta && buffer < delta && GNUNET_NO == force)
463 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer > 3\n");
464 LOG (GNUNET_ERROR_TYPE_DEBUG,
465 " last pid recv: %u, last ack sent: %u\n",
466 prev_fc->last_pid_recv, prev_fc->last_ack_sent);
470 /* Ok, ACK might be necessary, what PID to ACK? */
471 ack = prev_fc->last_pid_recv + buffer;
472 LOG (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
473 LOG (GNUNET_ERROR_TYPE_DEBUG,
474 " last pid %u, last ack %u, qmax %u, q %u\n",
475 prev_fc->last_pid_recv, prev_fc->last_ack_sent,
476 next_fc->queue_max, next_fc->queue_n);
477 if (ack == prev_fc->last_ack_sent && GNUNET_NO == force)
479 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
483 /* Check if message is already in queue */
484 if (NULL != prev_fc->ack_msg)
486 if (GM_is_pid_bigger (ack, prev_fc->last_ack_sent))
488 LOG (GNUNET_ERROR_TYPE_DEBUG, " canceling old ACK\n");
489 GMC_cancel (prev_fc->ack_msg);
490 /* GMC_cancel triggers ack_sent(), which clears fc->ack_msg */
494 LOG (GNUNET_ERROR_TYPE_DEBUG, " same ACK already in queue\n");
499 prev_fc->last_ack_sent = ack;
501 /* Build ACK message and send on connection */
502 msg.header.size = htons (sizeof (msg));
503 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK);
504 msg.ack = htonl (ack);
507 prev_fc->ack_msg = GMC_send_prebuilt_message (&msg.header, c,
514 * Callback called when a queued message is sent.
516 * Calculates the average time and connection packet tracking.
518 * @param cls Closure (ConnectionQueue Handle).
519 * @param c Connection this message was on.
520 * @param type Type of message sent.
521 * @param fwd Was this a FWD going message?
522 * @param size Size of the message.
523 * @param wait Time spent waiting for core (only the time for THIS message)
526 message_sent (void *cls,
527 struct MeshConnection *c, uint16_t type,
528 int fwd, size_t size,
529 struct GNUNET_TIME_Relative wait)
531 struct MeshConnectionPerformance *p;
532 struct MeshFlowControl *fc;
533 struct MeshConnectionQueue *q = cls;
537 fc = fwd ? &c->fwd_fc : &c->bck_fc;
538 LOG (GNUNET_ERROR_TYPE_DEBUG,
542 LOG (GNUNET_ERROR_TYPE_DEBUG, "! C_P- %p %u\n", c, c->pending_messages);
548 LOG (GNUNET_ERROR_TYPE_DEBUG, "! calling cont\n");
549 q->cont (q->cont_cls, c, q, type, fwd, size);
553 else if (type == GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED)
555 /* If NULL == q and ENCRYPTED == type, message must have been ch_mngmnt */
562 c->pending_messages--;
563 if (GNUNET_YES == c->destroy && 0 == c->pending_messages)
565 LOG (GNUNET_ERROR_TYPE_DEBUG, "! destroying connection!\n");
569 /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
572 case GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED:
574 LOG (GNUNET_ERROR_TYPE_DEBUG, "! Q_N- %p %u\n", fc, fc->queue_n);
575 if (GNUNET_NO == forced)
578 LOG (GNUNET_ERROR_TYPE_DEBUG,
579 "! accounting pid %u\n",
584 LOG (GNUNET_ERROR_TYPE_DEBUG,
585 "! forced, Q_N not accounting pid %u\n",
588 GMC_send_ack (c, fwd, GNUNET_NO);
591 case GNUNET_MESSAGE_TYPE_MESH_POLL:
595 case GNUNET_MESSAGE_TYPE_MESH_ACK:
602 LOG (GNUNET_ERROR_TYPE_DEBUG, "! message sent!\n");
605 return; /* Only endpoints are interested in timing. */
608 usecsperbyte = ((double) wait.rel_value_us) / size;
609 if (p->size == AVG_MSGS)
611 /* Array is full. Substract oldest value, add new one and store. */
612 p->avg -= (p->usecsperbyte[p->idx] / AVG_MSGS);
613 p->usecsperbyte[p->idx] = usecsperbyte;
614 p->avg += (p->usecsperbyte[p->idx] / AVG_MSGS);
618 /* Array not yet full. Add current value to avg and store. */
619 p->usecsperbyte[p->idx] = usecsperbyte;
621 p->avg += p->usecsperbyte[p->idx];
625 p->idx = (p->idx + 1) % AVG_MSGS;
630 * Get the previous hop in a connection
632 * @param c Connection.
634 * @return Previous peer in the connection.
636 static struct MeshPeer *
637 get_prev_hop (const struct MeshConnection *c)
641 LOG (GNUNET_ERROR_TYPE_DEBUG, "Get prev hop, own pos %u\n", c->own_pos);
642 if (0 == c->own_pos || c->path->length < 2)
643 id = c->path->peers[0];
645 id = c->path->peers[c->own_pos - 1];
647 return GMP_get_short (id);
652 * Get the next hop in a connection
654 * @param c Connection.
656 * @return Next peer in the connection.
658 static struct MeshPeer *
659 get_next_hop (const struct MeshConnection *c)
663 if ((c->path->length - 1) == c->own_pos || c->path->length < 2)
664 id = c->path->peers[c->path->length - 1];
666 id = c->path->peers[c->own_pos + 1];
668 return GMP_get_short (id);
673 * Get the hop in a connection.
675 * @param c Connection.
676 * @param fwd Next hop?
678 * @return Next peer in the connection.
680 static struct MeshPeer *
681 get_hop (struct MeshConnection *c, int fwd)
684 return get_next_hop (c);
685 return get_prev_hop (c);
690 * Is traffic coming from this sender 'FWD' traffic?
692 * @param c Connection to check.
693 * @param sender Peer identity of neighbor.
695 * @return #GNUNET_YES in case the sender is the 'prev' hop and therefore
696 * the traffic is 'FWD'.
697 * #GNUNET_NO for BCK.
698 * #GNUNET_SYSERR for errors.
701 is_fwd (const struct MeshConnection *c,
702 const struct GNUNET_PeerIdentity *sender)
706 id = GNUNET_PEER_search (sender);
707 if (GMP_get_short_id (get_prev_hop (c)) == id)
710 if (GMP_get_short_id (get_next_hop (c)) == id)
714 return GNUNET_SYSERR;
719 * Sends a CONNECTION ACK message in reponse to a received CONNECTION_CREATE
720 * or a first CONNECTION_ACK directed to us.
722 * @param connection Connection to confirm.
723 * @param fwd Should we send it FWD? (root->dest)
724 * (First (~SYNACK) goes BCK, second (~ACK) goes FWD)
727 send_connection_ack (struct MeshConnection *connection, int fwd)
729 struct MeshTunnel3 *t;
732 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send connection %s ACK\n",
734 GMP_queue_add (get_hop (connection, fwd), NULL,
735 GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK,
736 sizeof (struct GNUNET_MESH_ConnectionACK),
737 connection, fwd, &message_sent, NULL);
738 connection->pending_messages++;
739 if (MESH_TUNNEL3_NEW == GMT_get_cstate (t))
740 GMT_change_cstate (t, MESH_TUNNEL3_WAITING);
741 if (MESH_CONNECTION_READY != connection->state)
742 connection_change_state (connection, MESH_CONNECTION_SENT);
747 * Send a notification that a connection is broken.
749 * @param c Connection that is broken.
750 * @param id1 Peer that has disconnected.
751 * @param id2 Peer that has disconnected.
752 * @param fwd Direction towards which to send it.
755 send_broken (struct MeshConnection *c,
756 const struct GNUNET_PeerIdentity *id1,
757 const struct GNUNET_PeerIdentity *id2,
760 struct GNUNET_MESH_ConnectionBroken msg;
762 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectionBroken));
763 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN);
767 GMC_send_prebuilt_message (&msg.header, c, fwd, GNUNET_YES, NULL, NULL);
772 * Send keepalive packets for a connection.
774 * @param c Connection to keep alive..
775 * @param fwd Is this a FWD keepalive? (owner -> dest).
778 connection_keepalive (struct MeshConnection *c, int fwd)
780 struct GNUNET_MESH_ConnectionKeepAlive *msg;
781 size_t size = sizeof (struct GNUNET_MESH_ConnectionKeepAlive);
784 LOG (GNUNET_ERROR_TYPE_DEBUG,
785 "sending %s keepalive for connection %s]\n",
786 GM_f2s (fwd), GMC_2s (c));
788 msg = (struct GNUNET_MESH_ConnectionKeepAlive *) cbuf;
789 msg->header.size = htons (size);
790 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KEEPALIVE);
792 msg->reserved = htonl (0);
794 GMC_send_prebuilt_message (&msg->header, c, fwd, GNUNET_YES, NULL, NULL);
799 * Send CONNECTION_{CREATE/ACK} packets for a connection.
801 * @param c Connection for which to send the message.
802 * @param fwd If #GNUNET_YES, send CREATE, otherwise send ACK.
805 connection_recreate (struct MeshConnection *c, int fwd)
807 LOG (GNUNET_ERROR_TYPE_DEBUG, "sending connection recreate\n");
811 send_connection_ack (c, GNUNET_NO);
816 * Generic connection timer management.
817 * Depending on the role of the peer in the connection will send the
818 * appropriate message (build or keepalive)
820 * @param c Conncetion to maintain.
824 connection_maintain (struct MeshConnection *c, int fwd)
826 if (MESH_TUNNEL3_SEARCHING == GMT_get_cstate (c->t))
828 /* TODO DHT GET with RO_BART */
833 case MESH_CONNECTION_NEW:
836 case MESH_CONNECTION_SENT:
837 connection_recreate (c, fwd);
839 case MESH_CONNECTION_READY:
840 connection_keepalive (c, fwd);
849 connection_fwd_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
851 struct MeshConnection *c = cls;
852 struct GNUNET_TIME_Relative delay;
854 c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
855 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
858 connection_maintain (c, GNUNET_YES);
859 delay = c->state == MESH_CONNECTION_READY ?
860 refresh_connection_time : create_connection_time;
861 c->fwd_maintenance_task = GNUNET_SCHEDULER_add_delayed (delay,
862 &connection_fwd_keepalive,
868 connection_bck_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
870 struct MeshConnection *c = cls;
871 struct GNUNET_TIME_Relative delay;
873 c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
874 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
877 connection_maintain (c, GNUNET_NO);
878 delay = c->state == MESH_CONNECTION_READY ?
879 refresh_connection_time : create_connection_time;
880 c->bck_maintenance_task = GNUNET_SCHEDULER_add_delayed (delay,
881 &connection_bck_keepalive,
887 * @brief Re-initiate traffic on this connection if necessary.
889 * Check if there is traffic queued towards this peer
890 * and the core transmit handle is NULL (traffic was stalled).
891 * If so, call core tmt rdy.
893 * @param c Connection on which initiate traffic.
894 * @param fwd Is this about fwd traffic?
897 connection_unlock_queue (struct MeshConnection *c, int fwd)
899 struct MeshPeer *peer;
901 LOG (GNUNET_ERROR_TYPE_DEBUG,
902 "connection_unlock_queue %s on %s\n",
903 GM_f2s (fwd), GMC_2s (c));
905 if (GMC_is_terminal (c, fwd))
907 LOG (GNUNET_ERROR_TYPE_DEBUG, " is terminal!\n");
911 peer = get_hop (c, fwd);
912 GMP_queue_unlock (peer, c);
917 * Cancel all transmissions that belong to a certain connection.
919 * If the connection is scheduled for destruction and no more messages are left,
920 * the connection will be destroyed by the continuation call.
922 * @param c Connection which to cancel. Might be destroyed during this call.
923 * @param fwd Cancel fwd traffic?
926 connection_cancel_queues (struct MeshConnection *c, int fwd)
928 struct MeshFlowControl *fc;
929 struct MeshPeer *peer;
931 LOG (GNUNET_ERROR_TYPE_DEBUG,
932 " *** Cancel %s queues for connection %s\n",
933 GM_f2s (fwd), GMC_2s (c));
940 fc = fwd ? &c->fwd_fc : &c->bck_fc;
941 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
943 GNUNET_SCHEDULER_cancel (fc->poll_task);
944 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
945 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** Cancel POLL in ccq for fc %p\n", fc);
947 peer = get_hop (c, fwd);
948 GMP_queue_cancel (peer, c);
953 * Function called if a connection has been stalled for a while,
954 * possibly due to a missed ACK. Poll the neighbor about its ACK status.
956 * @param cls Closure (poll ctx).
957 * @param tc TaskContext.
960 connection_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
964 * Callback called when a queued POLL message is sent.
966 * @param cls Closure (FC).
967 * @param c Connection this message was on.
968 * @param q Queue handler this call invalidates.
969 * @param type Type of message sent.
970 * @param fwd Was this a FWD going message?
971 * @param size Size of the message.
974 poll_sent (void *cls,
975 struct MeshConnection *c,
976 struct MeshConnectionQueue *q,
977 uint16_t type, int fwd, size_t size)
979 struct MeshFlowControl *fc = cls;
983 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL canceled on shutdown\n");
986 LOG (GNUNET_ERROR_TYPE_DEBUG,
987 " *** POLL sent for , scheduling new one!\n");
989 fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
990 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
991 &connection_poll, fc);
992 LOG (GNUNET_ERROR_TYPE_DEBUG, " task %u\n", fc->poll_task);
997 * Function called if a connection has been stalled for a while,
998 * possibly due to a missed ACK. Poll the neighbor about its ACK status.
1000 * @param cls Closure (poll ctx).
1001 * @param tc TaskContext.
1004 connection_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1006 struct MeshFlowControl *fc = cls;
1007 struct GNUNET_MESH_Poll msg;
1008 struct MeshConnection *c;
1010 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
1011 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1017 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** Polling!\n");
1018 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** connection [%s]\n", GMC_2s (c));
1019 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** %s\n",
1020 fc == &c->fwd_fc ? "FWD" : "BCK");
1022 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL);
1023 msg.header.size = htons (sizeof (msg));
1024 msg.pid = htonl (fc->last_pid_sent);
1025 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** last pid sent: %u!\n", fc->last_pid_sent);
1026 fc->poll_msg = GMC_send_prebuilt_message (&msg.header, c,
1027 fc == &c->fwd_fc, GNUNET_YES,
1033 * Timeout function due to lack of keepalive/traffic from the owner.
1034 * Destroys connection if called.
1036 * @param cls Closure (connection to destroy).
1037 * @param tc TaskContext.
1040 connection_fwd_timeout (void *cls,
1041 const struct GNUNET_SCHEDULER_TaskContext *tc)
1043 struct MeshConnection *c = cls;
1045 c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
1046 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1048 LOG (GNUNET_ERROR_TYPE_DEBUG,
1049 "Connection %s[%X] FWD timed out. Destroying.\n",
1053 if (GMC_is_origin (c, GNUNET_YES)) /* If local, leave. */
1061 * Timeout function due to lack of keepalive/traffic from the destination.
1062 * Destroys connection if called.
1064 * @param cls Closure (connection to destroy).
1065 * @param tc TaskContext
1068 connection_bck_timeout (void *cls,
1069 const struct GNUNET_SCHEDULER_TaskContext *tc)
1071 struct MeshConnection *c = cls;
1073 c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
1074 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1077 LOG (GNUNET_ERROR_TYPE_DEBUG,
1078 "Connection %s[%X] FWD timed out. Destroying.\n",
1079 GMT_2s (c->t), c->id);
1081 if (GMC_is_origin (c, GNUNET_NO)) /* If local, leave. */
1089 * Resets the connection timeout task, some other message has done the
1091 * - For the first peer on the direction this means to send
1092 * a keepalive or a path confirmation message (either create or ACK).
1093 * - For all other peers, this means to destroy the connection,
1094 * due to lack of activity.
1095 * Starts the timeout if no timeout was running (connection just created).
1097 * @param c Connection whose timeout to reset.
1098 * @param fwd Is this forward?
1100 * TODO use heap to improve efficiency of scheduler.
1103 connection_reset_timeout (struct MeshConnection *c, int fwd)
1105 GNUNET_SCHEDULER_TaskIdentifier *ti;
1106 GNUNET_SCHEDULER_Task f;
1108 ti = fwd ? &c->fwd_maintenance_task : &c->bck_maintenance_task;
1110 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connection %s reset timeout\n", GM_f2s (fwd));
1112 if (GNUNET_SCHEDULER_NO_TASK != *ti)
1113 GNUNET_SCHEDULER_cancel (*ti);
1115 if (GMC_is_origin (c, fwd)) /* Startpoint */
1117 f = fwd ? &connection_fwd_keepalive : &connection_bck_keepalive;
1118 *ti = GNUNET_SCHEDULER_add_delayed (refresh_connection_time, f, c);
1120 else /* Relay, endpoint. */
1122 struct GNUNET_TIME_Relative delay;
1124 delay = GNUNET_TIME_relative_multiply (refresh_connection_time, 4);
1125 f = fwd ? &connection_fwd_timeout : &connection_bck_timeout;
1126 *ti = GNUNET_SCHEDULER_add_delayed (delay, f, c);
1132 * Add the connection to the list of both neighbors.
1134 * @param c Connection.
1136 * @return #GNUNET_OK if everything went fine
1137 * #GNUNET_SYSERR if the was an error and @c c is malformed.
1140 register_neighbors (struct MeshConnection *c)
1142 struct MeshPeer *next_peer;
1143 struct MeshPeer *prev_peer;
1145 next_peer = get_next_hop (c);
1146 prev_peer = get_prev_hop (c);
1148 if (GNUNET_NO == GMP_is_neighbor (next_peer)
1149 || GNUNET_NO == GMP_is_neighbor (prev_peer))
1151 if (GMC_is_origin (c, GNUNET_YES))
1154 GNUNET_break_op (0);
1155 LOG (GNUNET_ERROR_TYPE_DEBUG, " register neighbors failed\n");
1156 LOG (GNUNET_ERROR_TYPE_DEBUG, " prev: %s, %d\n",
1157 GMP_2s (prev_peer), GMP_is_neighbor (prev_peer));
1158 LOG (GNUNET_ERROR_TYPE_DEBUG, " next: %s, %d\n",
1159 GMP_2s (next_peer), GMP_is_neighbor (next_peer));
1160 return GNUNET_SYSERR;
1163 GMP_add_connection (next_peer, c);
1164 GMP_add_connection (prev_peer, c);
1171 * Remove the connection from the list of both neighbors.
1173 * @param c Connection.
1176 unregister_neighbors (struct MeshConnection *c)
1178 struct MeshPeer *peer;
1180 peer = get_next_hop (c);
1181 GMP_remove_connection (peer, c);
1183 peer = get_prev_hop (c);
1184 GMP_remove_connection (peer, c);
1190 * Bind the connection to the peer and the tunnel to that peer.
1192 * If the peer has no tunnel, create one. Update tunnel and connection
1193 * data structres to reflect new status.
1195 * @param c Connection.
1199 add_to_peer (struct MeshConnection *c, struct MeshPeer *peer)
1201 GMP_add_tunnel (peer);
1202 c->t = GMP_get_tunnel (peer);
1203 GMT_add_connection (c->t, c);
1206 /******************************************************************************/
1207 /******************************** API ***********************************/
1208 /******************************************************************************/
1211 * Core handler for connection creation.
1213 * @param cls Closure (unused).
1214 * @param peer Sender (neighbor).
1215 * @param message Message.
1217 * @return GNUNET_OK to keep the connection open,
1218 * GNUNET_SYSERR to close it (signal serious error)
1221 GMC_handle_create (void *cls, const struct GNUNET_PeerIdentity *peer,
1222 const struct GNUNET_MessageHeader *message)
1224 struct GNUNET_MESH_ConnectionCreate *msg;
1225 struct GNUNET_PeerIdentity *id;
1226 struct GNUNET_HashCode *cid;
1227 struct MeshPeerPath *path;
1228 struct MeshPeer *dest_peer;
1229 struct MeshPeer *orig_peer;
1230 struct MeshConnection *c;
1231 unsigned int own_pos;
1235 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1236 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received a connection create msg\n");
1239 size = ntohs (message->size);
1240 if (size < sizeof (struct GNUNET_MESH_ConnectionCreate))
1242 GNUNET_break_op (0);
1246 /* Calculate hops */
1247 size -= sizeof (struct GNUNET_MESH_ConnectionCreate);
1248 if (size % sizeof (struct GNUNET_PeerIdentity))
1250 GNUNET_break_op (0);
1253 size /= sizeof (struct GNUNET_PeerIdentity);
1256 GNUNET_break_op (0);
1259 LOG (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
1261 /* Get parameters */
1262 msg = (struct GNUNET_MESH_ConnectionCreate *) message;
1264 id = (struct GNUNET_PeerIdentity *) &msg[1];
1265 LOG (GNUNET_ERROR_TYPE_DEBUG,
1266 " connection %s (%s).\n",
1267 GNUNET_h2s (cid), GNUNET_i2s (id));
1269 /* Create connection */
1270 c = connection_get (cid);
1274 LOG (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
1275 path = path_new (size);
1277 for (i = 0; i < size; i++)
1279 LOG (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n",
1280 GNUNET_i2s (&id[i]));
1281 path->peers[i] = GNUNET_PEER_intern (&id[i]);
1282 if (path->peers[i] == myid)
1285 if (own_pos == 0 && path->peers[own_pos] != myid)
1287 /* create path: self not found in path through self */
1288 GNUNET_break_op (0);
1289 path_destroy (path);
1292 LOG (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
1293 GMP_add_path_to_all (path, GNUNET_NO);
1294 LOG (GNUNET_ERROR_TYPE_DEBUG, " Creating connection\n");
1295 c = GMC_new (cid, NULL, path_duplicate (path), own_pos);
1298 path_destroy (path);
1301 connection_reset_timeout (c, GNUNET_YES);
1305 path = path_duplicate (c->path);
1307 if (MESH_CONNECTION_NEW == c->state)
1308 connection_change_state (c, MESH_CONNECTION_SENT);
1310 /* Remember peers */
1311 dest_peer = GMP_get (&id[size - 1]);
1312 orig_peer = GMP_get (&id[0]);
1314 /* Is it a connection to us? */
1315 if (c->own_pos == size - 1)
1317 LOG (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
1318 GMP_add_path_to_origin (orig_peer, path_duplicate (path), GNUNET_YES);
1320 add_to_peer (c, orig_peer);
1321 if (MESH_TUNNEL3_NEW == GMT_get_cstate (c->t))
1322 GMT_change_cstate (c->t, MESH_TUNNEL3_WAITING);
1324 send_connection_ack (c, GNUNET_NO);
1325 if (MESH_CONNECTION_SENT == c->state)
1326 connection_change_state (c, MESH_CONNECTION_ACK);
1328 /* Keep tunnel alive in direction dest->owner*/
1329 if (GNUNET_SCHEDULER_NO_TASK == c->bck_maintenance_task)
1331 c->bck_maintenance_task =
1332 GNUNET_SCHEDULER_add_delayed (create_connection_time,
1333 &connection_bck_keepalive, c);
1338 /* It's for somebody else! Retransmit. */
1339 LOG (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
1340 GMP_add_path (dest_peer, path_duplicate (path), GNUNET_NO);
1341 GMP_add_path_to_origin (orig_peer, path_duplicate (path), GNUNET_NO);
1342 GMC_send_prebuilt_message (message, c, GNUNET_YES, GNUNET_YES, NULL, NULL);
1344 path_destroy (path);
1350 * Core handler for path confirmations.
1352 * @param cls closure
1353 * @param message message
1354 * @param peer peer identity this notification is about
1356 * @return GNUNET_OK to keep the connection open,
1357 * GNUNET_SYSERR to close it (signal serious error)
1360 GMC_handle_confirm (void *cls, const struct GNUNET_PeerIdentity *peer,
1361 const struct GNUNET_MessageHeader *message)
1363 struct GNUNET_MESH_ConnectionACK *msg;
1364 struct MeshConnection *c;
1365 struct MeshPeerPath *p;
1366 struct MeshPeer *pi;
1367 enum MeshConnectionState oldstate;
1370 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1371 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received a connection ACK msg\n");
1372 msg = (struct GNUNET_MESH_ConnectionACK *) message;
1373 LOG (GNUNET_ERROR_TYPE_DEBUG, " on connection %s\n",
1374 GNUNET_h2s (&msg->cid));
1375 c = connection_get (&msg->cid);
1378 GNUNET_STATISTICS_update (stats, "# control on unknown connection",
1380 LOG (GNUNET_ERROR_TYPE_DEBUG, " don't know the connection!\n");
1384 oldstate = c->state;
1385 LOG (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n", GNUNET_i2s (peer));
1386 pi = GMP_get (peer);
1387 if (get_next_hop (c) == pi)
1389 LOG (GNUNET_ERROR_TYPE_DEBUG, " SYNACK\n");
1391 if (MESH_CONNECTION_SENT == oldstate)
1392 connection_change_state (c, MESH_CONNECTION_ACK);
1394 else if (get_prev_hop (c) == pi)
1396 LOG (GNUNET_ERROR_TYPE_DEBUG, " ACK\n");
1398 connection_change_state (c, MESH_CONNECTION_READY);
1402 GNUNET_break_op (0);
1406 connection_reset_timeout (c, fwd);
1408 /* Add path to peers? */
1412 GMP_add_path_to_all (p, GNUNET_YES);
1419 /* Message for us as creator? */
1420 if (GMC_is_origin (c, GNUNET_YES))
1422 if (GNUNET_NO != fwd)
1424 GNUNET_break_op (0);
1427 LOG (GNUNET_ERROR_TYPE_DEBUG, " Connection (SYN)ACK for us!\n");
1429 /* If just created, cancel the short timeout and start a long one */
1430 if (MESH_CONNECTION_SENT == oldstate)
1431 connection_reset_timeout (c, GNUNET_YES);
1433 /* Change connection state */
1434 connection_change_state (c, MESH_CONNECTION_READY);
1435 send_connection_ack (c, GNUNET_YES);
1437 /* Change tunnel state, trigger KX */
1438 if (MESH_TUNNEL3_WAITING == GMT_get_cstate (c->t))
1439 GMT_change_cstate (c->t, MESH_TUNNEL3_READY);
1444 /* Message for us as destination? */
1445 if (GMC_is_terminal (c, GNUNET_YES))
1447 if (GNUNET_YES != fwd)
1449 GNUNET_break_op (0);
1452 LOG (GNUNET_ERROR_TYPE_DEBUG, " Connection ACK for us!\n");
1454 /* If just created, cancel the short timeout and start a long one */
1455 if (MESH_CONNECTION_ACK == oldstate)
1456 connection_reset_timeout (c, GNUNET_NO);
1458 /* Change tunnel state */
1459 if (MESH_TUNNEL3_WAITING == GMT_get_cstate (c->t))
1460 GMT_change_cstate (c->t, MESH_TUNNEL3_READY);
1465 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
1466 GMC_send_prebuilt_message (message, c, fwd, GNUNET_YES, NULL, NULL);
1472 * Core handler for notifications of broken paths
1474 * @param cls Closure (unused).
1475 * @param id Peer identity of sending neighbor.
1476 * @param message Message.
1478 * @return GNUNET_OK to keep the connection open,
1479 * GNUNET_SYSERR to close it (signal serious error)
1482 GMC_handle_broken (void* cls,
1483 const struct GNUNET_PeerIdentity* id,
1484 const struct GNUNET_MessageHeader* message)
1486 struct GNUNET_MESH_ConnectionBroken *msg;
1487 struct MeshConnection *c;
1490 LOG (GNUNET_ERROR_TYPE_DEBUG,
1491 "Received a CONNECTION BROKEN msg from %s\n", GNUNET_i2s (id));
1492 msg = (struct GNUNET_MESH_ConnectionBroken *) message;
1493 LOG (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
1494 GNUNET_i2s (&msg->peer1));
1495 LOG (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
1496 GNUNET_i2s (&msg->peer2));
1497 c = connection_get (&msg->cid);
1500 GNUNET_break_op (0);
1504 fwd = is_fwd (c, id);
1505 if (GMC_is_terminal (c, fwd))
1507 if (0 < c->pending_messages)
1508 c->destroy = GNUNET_YES;
1514 GMC_send_prebuilt_message (message, c, fwd, GNUNET_YES, NULL, NULL);
1515 c->destroy = GNUNET_YES;
1516 connection_cancel_queues (c, !fwd);
1525 * Core handler for tunnel destruction
1527 * @param cls Closure (unused).
1528 * @param peer Peer identity of sending neighbor.
1529 * @param message Message.
1531 * @return GNUNET_OK to keep the connection open,
1532 * GNUNET_SYSERR to close it (signal serious error)
1535 GMC_handle_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
1536 const struct GNUNET_MessageHeader *message)
1538 struct GNUNET_MESH_ConnectionDestroy *msg;
1539 struct MeshConnection *c;
1542 msg = (struct GNUNET_MESH_ConnectionDestroy *) message;
1543 LOG (GNUNET_ERROR_TYPE_DEBUG,
1544 "Got a CONNECTION DESTROY message from %s\n",
1546 LOG (GNUNET_ERROR_TYPE_DEBUG,
1547 " for connection %s\n",
1548 GNUNET_h2s (&msg->cid));
1549 c = connection_get (&msg->cid);
1552 /* Probably already got the message from another path,
1553 * destroyed the tunnel and retransmitted to children.
1556 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel",
1558 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection unknown: already destroyed?\n");
1561 fwd = is_fwd (c, peer);
1562 if (GNUNET_SYSERR == fwd)
1564 GNUNET_break_op (0);
1567 GMC_send_prebuilt_message (message, c, fwd, GNUNET_YES, NULL, NULL);
1568 c->destroy = GNUNET_YES;
1569 c->state = MESH_CONNECTION_DESTROYED;
1575 * Generic handler for mesh network encrypted traffic.
1577 * @param peer Peer identity this notification is about.
1578 * @param msg Encrypted message.
1580 * @return GNUNET_OK to keep the connection open,
1581 * GNUNET_SYSERR to close it (signal serious error)
1584 handle_mesh_encrypted (const struct GNUNET_PeerIdentity *peer,
1585 const struct GNUNET_MESH_Encrypted *msg)
1587 struct MeshConnection *c;
1588 struct MeshPeer *neighbor;
1589 struct MeshFlowControl *fc;
1590 GNUNET_PEER_Id peer_id;
1598 size = ntohs (msg->header.size);
1600 sizeof (struct GNUNET_MESH_Encrypted) +
1601 sizeof (struct GNUNET_MessageHeader))
1603 GNUNET_break_op (0);
1606 type = ntohs (msg->header.type);
1607 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1608 LOG (GNUNET_ERROR_TYPE_DEBUG, "got a %s message (#%u) from %s\n",
1609 GM_m2s (type), ntohl (msg->pid), GNUNET_i2s (peer));
1611 /* Check connection */
1612 c = connection_get (&msg->cid);
1615 GNUNET_STATISTICS_update (stats, "# unknown connection", 1, GNUNET_NO);
1616 LOG (GNUNET_ERROR_TYPE_DEBUG,
1617 "WARNING connection %s unknown\n",
1618 GNUNET_h2s (&msg->cid));
1622 /* Check if origin is as expected */
1623 neighbor = get_prev_hop (c);
1624 peer_id = GNUNET_PEER_search (peer);
1625 if (peer_id == GMP_get_short_id (neighbor))
1631 neighbor = get_next_hop (c);
1632 if (peer_id == GMP_get_short_id (neighbor))
1638 /* Unexpected peer sending traffic on a connection. */
1639 GNUNET_break_op (0);
1645 fc = fwd ? &c->bck_fc : &c->fwd_fc;
1646 pid = ntohl (msg->pid);
1647 if (GM_is_pid_bigger (pid, fc->last_ack_sent))
1649 GNUNET_STATISTICS_update (stats, "# unsolicited message", 1, GNUNET_NO);
1650 LOG (GNUNET_ERROR_TYPE_DEBUG,
1651 "WARNING Received PID %u, (prev %u), ACK %u\n",
1652 pid, fc->last_pid_recv, fc->last_ack_sent);
1655 if (GNUNET_NO == GM_is_pid_bigger (pid, fc->last_pid_recv))
1657 GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO);
1658 LOG (GNUNET_ERROR_TYPE_DEBUG,
1659 " Pid %u not expected (%u+), dropping!\n",
1660 pid, fc->last_pid_recv + 1);
1663 if (MESH_CONNECTION_SENT == c->state || MESH_CONNECTION_ACK == c->state)
1664 connection_change_state (c, MESH_CONNECTION_READY);
1665 connection_reset_timeout (c, fwd);
1666 fc->last_pid_recv = pid;
1668 /* Is this message for us? */
1669 if (GMC_is_terminal (c, fwd))
1671 /* TODO signature verification */
1672 LOG (GNUNET_ERROR_TYPE_DEBUG, " message for us!\n");
1673 GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO);
1680 fc->last_pid_recv = pid;
1681 GMT_handle_encrypted (c->t, msg);
1682 GMC_send_ack (c, fwd, GNUNET_NO);
1686 /* Message not for us: forward to next hop */
1687 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
1688 ttl = ntohl (msg->ttl);
1689 LOG (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
1692 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
1693 LOG (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
1694 GMC_send_ack (c, fwd, GNUNET_NO);
1698 GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
1699 GMC_send_prebuilt_message (&msg->header, c, fwd, GNUNET_NO, NULL, NULL);
1705 * Generic handler for mesh network encrypted traffic.
1707 * @param peer Peer identity this notification is about.
1708 * @param msg Encrypted message.
1710 * @return GNUNET_OK to keep the connection open,
1711 * GNUNET_SYSERR to close it (signal serious error)
1714 handle_mesh_kx (const struct GNUNET_PeerIdentity *peer,
1715 const struct GNUNET_MESH_KX *msg)
1717 struct MeshConnection *c;
1718 struct MeshPeer *neighbor;
1719 GNUNET_PEER_Id peer_id;
1725 size = ntohs (msg->header.size);
1727 sizeof (struct GNUNET_MESH_Encrypted) +
1728 sizeof (struct GNUNET_MessageHeader))
1730 GNUNET_break_op (0);
1733 type = ntohs (msg->header.type);
1734 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1735 LOG (GNUNET_ERROR_TYPE_DEBUG, "got a %s message from %s\n",
1736 GM_m2s (type), GNUNET_i2s (peer));
1738 /* Check connection */
1739 c = connection_get (&msg->cid);
1742 GNUNET_STATISTICS_update (stats, "# unknown connection", 1, GNUNET_NO);
1743 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING connection unknown\n");
1747 /* Check if origin is as expected */
1748 neighbor = get_prev_hop (c);
1749 peer_id = GNUNET_PEER_search (peer);
1750 if (peer_id == GMP_get_short_id (neighbor))
1756 neighbor = get_next_hop (c);
1757 if (peer_id == GMP_get_short_id (neighbor))
1763 /* Unexpected peer sending traffic on a connection. */
1764 GNUNET_break_op (0);
1769 /* Count as connection confirmation. */
1770 if (MESH_CONNECTION_SENT == c->state || MESH_CONNECTION_ACK == c->state)
1771 connection_change_state (c, MESH_CONNECTION_READY);
1772 connection_reset_timeout (c, fwd);
1775 if (MESH_TUNNEL3_WAITING == GMT_get_cstate (c->t))
1776 GMT_change_cstate (c->t, MESH_TUNNEL3_READY);
1779 /* Is this message for us? */
1780 if (GMC_is_terminal (c, fwd))
1782 LOG (GNUNET_ERROR_TYPE_DEBUG, " message for us!\n");
1783 GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO);
1789 GMT_handle_kx (c->t, &msg[1].header);
1793 /* Message not for us: forward to next hop */
1794 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
1795 GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
1796 GMC_send_prebuilt_message (&msg->header, c, fwd, GNUNET_NO, NULL, NULL);
1803 * Core handler for encrypted mesh network traffic (channel mgmt, data).
1805 * @param cls Closure (unused).
1806 * @param message Message received.
1807 * @param peer Peer who sent the message.
1809 * @return GNUNET_OK to keep the connection open,
1810 * GNUNET_SYSERR to close it (signal serious error)
1813 GMC_handle_encrypted (void *cls, const struct GNUNET_PeerIdentity *peer,
1814 const struct GNUNET_MessageHeader *message)
1816 return handle_mesh_encrypted (peer,
1817 (struct GNUNET_MESH_Encrypted *)message);
1822 * Core handler for key exchange traffic (ephemeral key, ping, pong).
1824 * @param cls Closure (unused).
1825 * @param message Message received.
1826 * @param peer Peer who sent the message.
1828 * @return GNUNET_OK to keep the connection open,
1829 * GNUNET_SYSERR to close it (signal serious error)
1832 GMC_handle_kx (void *cls, const struct GNUNET_PeerIdentity *peer,
1833 const struct GNUNET_MessageHeader *message)
1835 return handle_mesh_kx (peer,
1836 (struct GNUNET_MESH_KX *) message);
1841 * Core handler for mesh network traffic point-to-point acks.
1843 * @param cls closure
1844 * @param message message
1845 * @param peer peer identity this notification is about
1847 * @return GNUNET_OK to keep the connection open,
1848 * GNUNET_SYSERR to close it (signal serious error)
1851 GMC_handle_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
1852 const struct GNUNET_MessageHeader *message)
1854 struct GNUNET_MESH_ACK *msg;
1855 struct MeshConnection *c;
1856 struct MeshFlowControl *fc;
1861 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1862 LOG (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
1864 msg = (struct GNUNET_MESH_ACK *) message;
1866 c = connection_get (&msg->cid);
1870 GNUNET_STATISTICS_update (stats, "# ack on unknown connection", 1,
1875 /* Is this a forward or backward ACK? */
1876 id = GNUNET_PEER_search (peer);
1877 if (GMP_get_short_id (get_next_hop (c)) == id)
1879 LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
1883 else if (GMP_get_short_id (get_prev_hop (c)) == id)
1885 LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
1891 GNUNET_break_op (0);
1895 ack = ntohl (msg->ack);
1896 LOG (GNUNET_ERROR_TYPE_DEBUG, " ACK %u (was %u)\n",
1897 ack, fc->last_ack_recv);
1898 if (GM_is_pid_bigger (ack, fc->last_ack_recv))
1899 fc->last_ack_recv = ack;
1901 /* Cancel polling if the ACK is big enough. */
1902 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task &&
1903 GM_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
1905 LOG (GNUNET_ERROR_TYPE_DEBUG, " Cancel poll\n");
1906 GNUNET_SCHEDULER_cancel (fc->poll_task);
1907 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
1908 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
1911 connection_unlock_queue (c, fwd);
1918 * Core handler for mesh network traffic point-to-point ack polls.
1920 * @param cls closure
1921 * @param message message
1922 * @param peer peer identity this notification is about
1924 * @return GNUNET_OK to keep the connection open,
1925 * GNUNET_SYSERR to close it (signal serious error)
1928 GMC_handle_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
1929 const struct GNUNET_MessageHeader *message)
1931 struct GNUNET_MESH_Poll *msg;
1932 struct MeshConnection *c;
1933 struct MeshFlowControl *fc;
1938 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1939 LOG (GNUNET_ERROR_TYPE_DEBUG,
1940 "Got a POLL packet from %s!\n",
1943 msg = (struct GNUNET_MESH_Poll *) message;
1945 c = connection_get (&msg->cid);
1949 GNUNET_STATISTICS_update (stats, "# poll on unknown connection", 1,
1951 GNUNET_break_op (0);
1955 /* Is this a forward or backward ACK?
1956 * Note: a poll should never be needed in a loopback case,
1957 * since there is no possiblility of packet loss there, so
1958 * this way of discerining FWD/BCK should not be a problem.
1960 id = GNUNET_PEER_search (peer);
1961 if (GMP_get_short_id (get_next_hop (c)) == id)
1963 LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD FC\n");
1966 else if (GMP_get_short_id (get_prev_hop (c)) == id)
1968 LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK FC\n");
1973 GNUNET_break_op (0);
1977 pid = ntohl (msg->pid);
1978 LOG (GNUNET_ERROR_TYPE_DEBUG, " PID %u, OLD %u\n", pid, fc->last_pid_recv);
1979 fc->last_pid_recv = pid;
1980 fwd = fc == &c->bck_fc;
1981 GMC_send_ack (c, fwd, GNUNET_YES);
1988 * Core handler for mesh keepalives.
1990 * @param cls closure
1991 * @param message message
1992 * @param peer peer identity this notification is about
1993 * @return GNUNET_OK to keep the connection open,
1994 * GNUNET_SYSERR to close it (signal serious error)
1996 * TODO: Check who we got this from, to validate route.
1999 GMC_handle_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
2000 const struct GNUNET_MessageHeader *message)
2002 struct GNUNET_MESH_ConnectionKeepAlive *msg;
2003 struct MeshConnection *c;
2004 struct MeshPeer *neighbor;
2005 GNUNET_PEER_Id peer_id;
2008 msg = (struct GNUNET_MESH_ConnectionKeepAlive *) message;
2009 LOG (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
2012 c = connection_get (&msg->cid);
2015 GNUNET_STATISTICS_update (stats, "# keepalive on unknown connection", 1,
2020 /* Check if origin is as expected TODO refactor and reuse */
2021 peer_id = GNUNET_PEER_search (peer);
2022 neighbor = get_prev_hop (c);
2023 if (peer_id == GMP_get_short_id (neighbor))
2029 neighbor = get_next_hop (c);
2030 if (peer_id == GMP_get_short_id (neighbor))
2036 GNUNET_break_op (0);
2041 connection_change_state (c, MESH_CONNECTION_READY);
2042 connection_reset_timeout (c, fwd);
2044 if (GMC_is_terminal (c, fwd))
2047 GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
2048 GMC_send_prebuilt_message (message, c, fwd, GNUNET_YES, NULL, NULL);
2055 * Send an ACK on the appropriate connection/channel, depending on
2056 * the direction and the position of the peer.
2058 * @param c Which connection to send the hop-by-hop ACK.
2059 * @param fwd Is this a fwd ACK? (will go dest->root).
2060 * @param force Send the ACK even if suboptimal (e.g. requested by POLL).
2063 GMC_send_ack (struct MeshConnection *c, int fwd, int force)
2065 unsigned int buffer;
2067 LOG (GNUNET_ERROR_TYPE_DEBUG,
2068 "GMC send %s ACK on %s\n",
2069 GM_f2s (fwd), GMC_2s (c));
2077 if (GNUNET_NO != c->destroy)
2079 LOG (GNUNET_ERROR_TYPE_DEBUG, " being destroyed, why bother...\n");
2083 /* Get available buffer space */
2084 if (GMC_is_terminal (c, fwd))
2086 LOG (GNUNET_ERROR_TYPE_DEBUG, " getting from all channels\n");
2087 buffer = GMT_get_channels_buffer (c->t);
2091 LOG (GNUNET_ERROR_TYPE_DEBUG, " getting from one connection\n");
2092 buffer = GMC_get_buffer (c, fwd);
2094 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer available: %u\n", buffer);
2095 if (0 == buffer && GNUNET_NO == force)
2098 /* Send available buffer space */
2099 if (GMC_is_origin (c, fwd))
2101 GNUNET_assert (NULL != c->t);
2102 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on channels...\n");
2103 GMT_unchoke_channels (c->t);
2107 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on connection\n");
2108 send_ack (c, buffer, fwd, force);
2114 * Initialize the connections subsystem
2116 * @param c Configuration handle.
2119 GMC_init (const struct GNUNET_CONFIGURATION_Handle *c)
2121 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
2123 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
2126 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
2127 "MESH", "MAX_MSGS_QUEUE", "MISSING");
2128 GNUNET_SCHEDULER_shutdown ();
2133 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_CONNECTIONS",
2136 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
2137 "MESH", "MAX_CONNECTIONS", "MISSING");
2138 GNUNET_SCHEDULER_shutdown ();
2143 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_CONNECTION_TIME",
2144 &refresh_connection_time))
2146 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
2147 "MESH", "REFRESH_CONNECTION_TIME", "MISSING");
2148 GNUNET_SCHEDULER_shutdown ();
2151 create_connection_time = GNUNET_TIME_UNIT_SECONDS;
2152 connections = GNUNET_CONTAINER_multihashmap_create (1024, GNUNET_YES);
2157 * Destroy each connection on shutdown.
2159 * @param cls Closure (unused).
2160 * @param key Current key code (CID, unused).
2161 * @param value Value in the hash map (connection)
2163 * @return #GNUNET_YES, because we should continue to iterate,
2166 shutdown_iterator (void *cls,
2167 const struct GNUNET_HashCode *key,
2170 struct MeshConnection *c = value;
2178 * Shut down the connections subsystem.
2183 GNUNET_CONTAINER_multihashmap_iterate (connections, &shutdown_iterator, NULL);
2184 GNUNET_CONTAINER_multihashmap_destroy (connections);
2189 struct MeshConnection *
2190 GMC_new (const struct GNUNET_HashCode *cid,
2191 struct MeshTunnel3 *t,
2192 struct MeshPeerPath *p,
2193 unsigned int own_pos)
2195 struct MeshConnection *c;
2197 c = GNUNET_new (struct MeshConnection);
2199 GNUNET_CONTAINER_multihashmap_put (connections, &c->id, c,
2200 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
2201 fc_init (&c->fwd_fc);
2202 fc_init (&c->bck_fc);
2207 if (own_pos > p->length - 1)
2213 c->own_pos = own_pos;
2218 c->fwd_maintenance_task =
2219 GNUNET_SCHEDULER_add_delayed (create_connection_time,
2220 &connection_fwd_keepalive, c);
2222 if (GNUNET_OK != register_neighbors (c))
2233 GMC_destroy (struct MeshConnection *c)
2238 if (2 == c->destroy) /* cancel queues -> GMP_queue_cancel -> q_destroy -> */
2239 return; /* -> message_sent -> GMC_destroy. Don't loop. */
2242 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying connection %s\n", GMC_2s (c));
2243 LOG (GNUNET_ERROR_TYPE_DEBUG, " fc's f: %p, b: %p\n",
2244 &c->fwd_fc, &c->bck_fc);
2245 LOG (GNUNET_ERROR_TYPE_DEBUG, " fc tasks f: %u, b: %u\n",
2246 c->fwd_fc.poll_task, c->bck_fc.poll_task);
2248 /* Cancel all traffic */
2249 connection_cancel_queues (c, GNUNET_YES);
2250 connection_cancel_queues (c, GNUNET_NO);
2252 LOG (GNUNET_ERROR_TYPE_DEBUG, " fc tasks f: %u, b: %u\n",
2253 c->fwd_fc.poll_task, c->bck_fc.poll_task);
2255 /* Cancel maintainance task (keepalive/timeout) */
2256 if (NULL != c->fwd_fc.poll_msg)
2258 GMC_cancel (c->fwd_fc.poll_msg);
2259 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL msg FWD canceled\n");
2261 if (NULL != c->bck_fc.poll_msg)
2263 GMC_cancel (c->bck_fc.poll_msg);
2264 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL msg BCK canceled\n");
2267 /* Unregister from neighbors */
2268 unregister_neighbors (c);
2271 GNUNET_STATISTICS_update (stats, "# connections", -1, GNUNET_NO);
2273 GMT_remove_connection (c->t, c);
2275 if (GNUNET_NO == GMC_is_origin (c, GNUNET_YES))
2276 path_destroy (c->path);
2277 if (GNUNET_SCHEDULER_NO_TASK != c->fwd_maintenance_task)
2278 GNUNET_SCHEDULER_cancel (c->fwd_maintenance_task);
2279 if (GNUNET_SCHEDULER_NO_TASK != c->bck_maintenance_task)
2280 GNUNET_SCHEDULER_cancel (c->bck_maintenance_task);
2281 if (GNUNET_SCHEDULER_NO_TASK != c->fwd_fc.poll_task)
2283 GNUNET_SCHEDULER_cancel (c->fwd_fc.poll_task);
2284 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL FWD canceled\n");
2286 if (GNUNET_SCHEDULER_NO_TASK != c->bck_fc.poll_task)
2288 GNUNET_SCHEDULER_cancel (c->bck_fc.poll_task);
2289 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL BCK canceled\n");
2292 GNUNET_break (GNUNET_YES ==
2293 GNUNET_CONTAINER_multihashmap_remove (connections, &c->id, c));
2299 * Get the connection ID.
2301 * @param c Connection to get the ID from.
2303 * @return ID of the connection.
2305 const struct GNUNET_HashCode *
2306 GMC_get_id (const struct MeshConnection *c)
2313 * Get the connection path.
2315 * @param c Connection to get the path from.
2317 * @return path used by the connection.
2319 const struct MeshPeerPath *
2320 GMC_get_path (const struct MeshConnection *c)
2322 if (GNUNET_NO == c->destroy)
2329 * Get the connection state.
2331 * @param c Connection to get the state from.
2333 * @return state of the connection.
2335 enum MeshConnectionState
2336 GMC_get_state (const struct MeshConnection *c)
2342 * Get the connection tunnel.
2344 * @param c Connection to get the tunnel from.
2346 * @return tunnel of the connection.
2348 struct MeshTunnel3 *
2349 GMC_get_tunnel (const struct MeshConnection *c)
2356 * Get free buffer space in a connection.
2358 * @param c Connection.
2359 * @param fwd Is query about FWD traffic?
2361 * @return Free buffer space [0 - max_msgs_queue/max_connections]
2364 GMC_get_buffer (struct MeshConnection *c, int fwd)
2366 struct MeshFlowControl *fc;
2368 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2370 return (fc->queue_max - fc->queue_n);
2374 * Get how many messages have we allowed to send to us from a direction.
2376 * @param c Connection.
2377 * @param fwd Are we asking about traffic from FWD (BCK messages)?
2379 * @return last_ack_sent - last_pid_recv
2382 GMC_get_allowed (struct MeshConnection *c, int fwd)
2384 struct MeshFlowControl *fc;
2386 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2387 if (GM_is_pid_bigger(fc->last_pid_recv, fc->last_ack_sent))
2391 return (fc->last_ack_sent - fc->last_pid_recv);
2395 * Get messages queued in a connection.
2397 * @param c Connection.
2398 * @param fwd Is query about FWD traffic?
2400 * @return Number of messages queued.
2403 GMC_get_qn (struct MeshConnection *c, int fwd)
2405 struct MeshFlowControl *fc;
2407 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2414 * Allow the connection to advertise a buffer of the given size.
2416 * The connection will send an @c fwd ACK message (so: in direction !fwd)
2417 * allowing up to last_pid_recv + buffer.
2419 * @param c Connection.
2420 * @param buffer How many more messages the connection can accept.
2421 * @param fwd Is this about FWD traffic? (The ack will go dest->root).
2424 GMC_allow (struct MeshConnection *c, unsigned int buffer, int fwd)
2426 send_ack (c, buffer, fwd, GNUNET_NO);
2431 * Notify other peers on a connection of a broken link. Mark connections
2432 * to destroy after all traffic has been sent.
2434 * @param c Connection on which there has been a disconnection.
2435 * @param peer Peer that disconnected.
2438 GMC_notify_broken (struct MeshConnection *c,
2439 struct MeshPeer *peer)
2443 LOG (GNUNET_ERROR_TYPE_DEBUG,
2444 " notify broken on %s due to %s disconnect\n",
2445 GMC_2s (c), GMP_2s (peer));
2447 fwd = peer == get_prev_hop (c);
2449 if (GNUNET_YES == GMC_is_terminal (c, fwd))
2451 /* Local shutdown, no one to notify about this. */
2455 if (GNUNET_NO == c->destroy)
2456 send_broken (c, &my_full_id, GMP_get_id (peer), fwd);
2458 /* Connection will have at least one pending message
2459 * (the one we just scheduled), so no point in checking whether to
2460 * destroy immediately. */
2461 c->destroy = GNUNET_YES;
2462 c->state = MESH_CONNECTION_DESTROYED;
2465 * Cancel all queues, if no message is left, connection will be destroyed.
2467 connection_cancel_queues (c, !fwd);
2474 * Is this peer the first one on the connection?
2476 * @param c Connection.
2477 * @param fwd Is this about fwd traffic?
2479 * @return #GNUNET_YES if origin, #GNUNET_NO if relay/terminal.
2482 GMC_is_origin (struct MeshConnection *c, int fwd)
2484 if (!fwd && c->path->length - 1 == c->own_pos )
2486 if (fwd && 0 == c->own_pos)
2493 * Is this peer the last one on the connection?
2495 * @param c Connection.
2496 * @param fwd Is this about fwd traffic?
2497 * Note that the ROOT is the terminal for BCK traffic!
2499 * @return #GNUNET_YES if terminal, #GNUNET_NO if relay/origin.
2502 GMC_is_terminal (struct MeshConnection *c, int fwd)
2504 return GMC_is_origin (c, !fwd);
2509 * See if we are allowed to send by the next hop in the given direction.
2511 * @param c Connection.
2512 * @param fwd Is this about fwd traffic?
2514 * @return #GNUNET_YES in case it's OK to send.
2517 GMC_is_sendable (struct MeshConnection *c, int fwd)
2519 struct MeshFlowControl *fc;
2521 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2522 if (GM_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
2528 * Sends an already built message on a connection, properly registering
2529 * all used resources.
2531 * @param message Message to send. Function makes a copy of it.
2532 * If message is not hop-by-hop, decrements TTL of copy.
2533 * @param c Connection on which this message is transmitted.
2534 * @param fwd Is this a fwd message?
2535 * @param force Force the connection to accept the message (buffer overfill).
2536 * @param cont Continuation called once message is sent. Can be NULL.
2537 * @param cont_cls Closure for @c cont.
2539 * @return Handle to cancel the message before it's sent.
2540 * NULL on error or if @c cont is NULL.
2541 * Invalid on @c cont call.
2543 struct MeshConnectionQueue *
2544 GMC_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
2545 struct MeshConnection *c, int fwd, int force,
2546 GMC_sent cont, void *cont_cls)
2548 struct MeshFlowControl *fc;
2549 struct MeshConnectionQueue *q;
2555 size = ntohs (message->size);
2556 data = GNUNET_malloc (size);
2557 memcpy (data, message, size);
2558 type = ntohs (message->type);
2559 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send %s (%u bytes) on connection %s\n",
2560 GM_m2s (type), size, GMC_2s (c));
2562 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2563 droppable = GNUNET_NO == force;
2566 struct GNUNET_MESH_Encrypted *emsg;
2567 struct GNUNET_MESH_KX *kmsg;
2568 struct GNUNET_MESH_ACK *amsg;
2569 struct GNUNET_MESH_Poll *pmsg;
2570 struct GNUNET_MESH_ConnectionDestroy *dmsg;
2571 struct GNUNET_MESH_ConnectionBroken *bmsg;
2574 case GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED:
2575 emsg = (struct GNUNET_MESH_Encrypted *) data;
2576 ttl = ntohl (emsg->ttl);
2579 GNUNET_break_op (0);
2584 emsg->ttl = htonl (ttl - 1);
2585 emsg->pid = htonl (fc->next_pid++);
2586 LOG (GNUNET_ERROR_TYPE_DEBUG, " Q_N+ %p %u\n", fc, fc->queue_n);
2587 if (GNUNET_YES == droppable)
2590 LOG (GNUNET_ERROR_TYPE_DEBUG, "pid %u\n", ntohl (emsg->pid));
2591 LOG (GNUNET_ERROR_TYPE_DEBUG, "last pid sent %u\n", fc->last_pid_sent);
2592 LOG (GNUNET_ERROR_TYPE_DEBUG, " ack recv %u\n", fc->last_ack_recv);
2596 LOG (GNUNET_ERROR_TYPE_DEBUG, " not droppable, Q_N stays the same\n");
2598 if (GM_is_pid_bigger (fc->last_pid_sent + 1, fc->last_ack_recv))
2600 GMC_start_poll (c, fwd);
2604 case GNUNET_MESSAGE_TYPE_MESH_KX:
2605 kmsg = (struct GNUNET_MESH_KX *) data;
2609 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2610 amsg = (struct GNUNET_MESH_ACK *) data;
2612 LOG (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", ntohl (amsg->ack));
2613 droppable = GNUNET_NO;
2616 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2617 pmsg = (struct GNUNET_MESH_Poll *) data;
2619 LOG (GNUNET_ERROR_TYPE_DEBUG, " poll %u\n", ntohl (pmsg->pid));
2620 droppable = GNUNET_NO;
2623 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY:
2624 dmsg = (struct GNUNET_MESH_ConnectionDestroy *) data;
2629 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
2630 bmsg = (struct GNUNET_MESH_ConnectionBroken *) data;
2635 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
2636 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
2637 case GNUNET_MESSAGE_TYPE_MESH_KEEPALIVE:
2646 if (fc->queue_n > fc->queue_max && droppable)
2648 GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)",
2651 LOG (GNUNET_ERROR_TYPE_DEBUG,
2652 "queue full: %u/%u\n",
2653 fc->queue_n, fc->queue_max);
2654 if (GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED == type)
2660 return NULL; /* Drop this message */
2663 LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P+ %p %u\n", c, c->pending_messages);
2664 c->pending_messages++;
2666 q = GNUNET_new (struct MeshConnectionQueue);
2667 q->forced = !droppable;
2668 q->q = GMP_queue_add (get_hop (c, fwd), data, type, size, c, fwd,
2678 q->cont_cls = cont_cls;
2684 * Cancel a previously sent message while it's in the queue.
2686 * ONLY can be called before the continuation given to the send function
2687 * is called. Once the continuation is called, the message is no longer in the
2690 * @param q Handle to the queue.
2693 GMC_cancel (struct MeshConnectionQueue *q)
2695 LOG (GNUNET_ERROR_TYPE_DEBUG, "! GMC cancel message\n");
2697 /* queue destroy calls message_sent, which calls q->cont and frees q */
2698 GMP_queue_destroy (q->q, GNUNET_YES);
2703 * Sends a CREATE CONNECTION message for a path to a peer.
2704 * Changes the connection and tunnel states if necessary.
2706 * @param connection Connection to create.
2709 GMC_send_create (struct MeshConnection *connection)
2711 enum MeshTunnel3CState state;
2714 size = sizeof (struct GNUNET_MESH_ConnectionCreate);
2715 size += connection->path->length * sizeof (struct GNUNET_PeerIdentity);
2717 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send connection create\n");
2718 LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P+ %p %u (create)\n",
2719 connection, connection->pending_messages);
2720 connection->pending_messages++;
2722 GMP_queue_add (get_next_hop (connection), NULL,
2723 GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE,
2724 size, connection, GNUNET_YES, &message_sent, NULL);
2726 state = GMT_get_cstate (connection->t);
2727 if (MESH_TUNNEL3_SEARCHING == state || MESH_TUNNEL3_NEW == state)
2728 GMT_change_cstate (connection->t, MESH_TUNNEL3_WAITING);
2729 if (MESH_CONNECTION_NEW == connection->state)
2730 connection_change_state (connection, MESH_CONNECTION_SENT);
2735 * Send a message to all peers in this connection that the connection
2736 * is no longer valid.
2738 * If some peer should not receive the message, it should be zero'ed out
2739 * before calling this function.
2741 * @param c The connection whose peers to notify.
2744 GMC_send_destroy (struct MeshConnection *c)
2746 struct GNUNET_MESH_ConnectionDestroy msg;
2748 if (GNUNET_YES == c->destroy)
2751 msg.header.size = htons (sizeof (msg));
2752 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY);;
2754 LOG (GNUNET_ERROR_TYPE_DEBUG,
2755 " sending connection destroy for connection %s\n",
2758 if (GNUNET_NO == GMC_is_terminal (c, GNUNET_YES))
2759 GMC_send_prebuilt_message (&msg.header, c,
2760 GNUNET_YES, GNUNET_YES, NULL, NULL);
2761 if (GNUNET_NO == GMC_is_terminal (c, GNUNET_NO))
2762 GMC_send_prebuilt_message (&msg.header, c,
2763 GNUNET_NO, GNUNET_YES, NULL, NULL);
2764 c->destroy = GNUNET_YES;
2765 c->state = MESH_CONNECTION_DESTROYED;
2770 * @brief Start a polling timer for the connection.
2772 * When a neighbor does not accept more traffic on the connection it could be
2773 * caused by a simple congestion or by a lost ACK. Polling enables to check
2774 * for the lastest ACK status for a connection.
2776 * @param c Connection.
2777 * @param fwd Should we poll in the FWD direction?
2780 GMC_start_poll (struct MeshConnection *c, int fwd)
2782 struct MeshFlowControl *fc;
2784 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2785 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL %s requested\n",
2787 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task || NULL != fc->poll_msg)
2789 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** not needed (%u, %p)\n",
2790 fc->poll_task, fc->poll_msg);
2793 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL started on request\n");
2794 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
2801 * @brief Stop polling a connection for ACKs.
2803 * Once we have enough ACKs for future traffic, polls are no longer necessary.
2805 * @param c Connection.
2806 * @param fwd Should we stop the poll in the FWD direction?
2809 GMC_stop_poll (struct MeshConnection *c, int fwd)
2811 struct MeshFlowControl *fc;
2813 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2814 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
2816 GNUNET_SCHEDULER_cancel (fc->poll_task);
2817 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2822 * Get a (static) string for a connection.
2824 * @param c Connection.
2827 GMC_2s (struct MeshConnection *c)
2834 static char buf[128];
2836 sprintf (buf, "%s (->%s)", GNUNET_h2s (&c->id), GMT_2s (c->t));
2839 return GNUNET_h2s (&c->id);