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
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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.
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16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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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. At the origin of the connection
183 * it's a pointer to the destination's path pool, otherwise just a copy.
185 struct MeshPeerPath *path;
188 * Position of the local peer in the path.
190 unsigned int own_pos;
193 * Task to keep the used paths alive at the owner,
194 * time tunnel out on all the other peers.
196 GNUNET_SCHEDULER_TaskIdentifier fwd_maintenance_task;
199 * Task to keep the used paths alive at the destination,
200 * time tunnel out on all the other peers.
202 GNUNET_SCHEDULER_TaskIdentifier bck_maintenance_task;
205 * Pending message count.
207 int pending_messages;
210 * Destroy flag: if true, destroy on last message.
216 * Handle for messages queued but not yet sent.
218 struct MeshConnectionQueue
221 * Peer queue handle, to cancel if necessary.
223 struct MeshPeerQueue *q;
226 * Was this a forced message? (Do not account for it)
231 * Continuation to call once sent.
236 * Closure for @c cont.
241 /******************************************************************************/
242 /******************************* GLOBALS ***********************************/
243 /******************************************************************************/
246 * Global handle to the statistics service.
248 extern struct GNUNET_STATISTICS_Handle *stats;
251 * Local peer own ID (memory efficient handle).
253 extern GNUNET_PEER_Id myid;
256 * Local peer own ID (full value).
258 extern struct GNUNET_PeerIdentity my_full_id;
261 * Connections known, indexed by cid (MeshConnection).
263 static struct GNUNET_CONTAINER_MultiHashMap *connections;
266 * How many connections are we willing to maintain.
267 * Local connections are always allowed, even if there are more connections than max.
269 static unsigned long long max_connections;
272 * How many messages *in total* are we willing to queue, divide by number of
273 * connections to get connection queue size.
275 static unsigned long long max_msgs_queue;
278 * How often to send path keepalives. Paths timeout after 4 missed.
280 static struct GNUNET_TIME_Relative refresh_connection_time;
283 * How often to send path create / ACKs.
285 static struct GNUNET_TIME_Relative create_connection_time;
288 /******************************************************************************/
289 /******************************** STATIC ***********************************/
290 /******************************************************************************/
292 #if 0 // avoid compiler warning for unused static function
294 fc_debug (struct MeshFlowControl *fc)
296 LOG (GNUNET_ERROR_TYPE_DEBUG, " IN: %u/%u\n",
297 fc->last_pid_recv, fc->last_ack_sent);
298 LOG (GNUNET_ERROR_TYPE_DEBUG, " OUT: %u/%u\n",
299 fc->last_pid_sent, fc->last_ack_recv);
300 LOG (GNUNET_ERROR_TYPE_DEBUG, " QUEUE: %u/%u\n",
301 fc->queue_n, fc->queue_max);
305 connection_debug (struct MeshConnection *c)
309 LOG (GNUNET_ERROR_TYPE_DEBUG, "*** DEBUG NULL CONNECTION ***\n");
312 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connection %s:%X\n",
313 peer2s (c->t->peer), GMC_2s (c));
314 LOG (GNUNET_ERROR_TYPE_DEBUG, " state: %u, pending msgs: %u\n",
315 c->state, c->pending_messages);
316 LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD FC\n");
317 fc_debug (&c->fwd_fc);
318 LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK FC\n");
319 fc_debug (&c->bck_fc);
324 * Get string description for tunnel state.
326 * @param s Tunnel state.
328 * @return String representation.
331 GMC_state2s (enum MeshConnectionState s)
335 case MESH_CONNECTION_NEW:
336 return "MESH_CONNECTION_NEW";
337 case MESH_CONNECTION_SENT:
338 return "MESH_CONNECTION_SENT";
339 case MESH_CONNECTION_ACK:
340 return "MESH_CONNECTION_ACK";
341 case MESH_CONNECTION_READY:
342 return "MESH_CONNECTION_READY";
343 case MESH_CONNECTION_DESTROYED:
344 return "MESH_CONNECTION_DESTROYED";
346 return "MESH_CONNECTION_STATE_ERROR";
352 * Initialize a Flow Control structure to the initial state.
354 * @param fc Flow Control structure to initialize.
357 fc_init (struct MeshFlowControl *fc)
360 fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
361 fc->last_pid_recv = (uint32_t) -1;
362 fc->last_ack_sent = (uint32_t) 0;
363 fc->last_ack_recv = (uint32_t) 0;
364 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
365 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
367 fc->queue_max = (max_msgs_queue / max_connections) + 1;
374 * @param cid Connection ID.
376 static struct MeshConnection *
377 connection_get (const struct GNUNET_HashCode *cid)
379 return GNUNET_CONTAINER_multihashmap_get (connections, cid);
384 connection_change_state (struct MeshConnection* c,
385 enum MeshConnectionState state)
387 LOG (GNUNET_ERROR_TYPE_DEBUG,
388 "Connection %s state was %s\n",
389 GMC_2s (c), GMC_state2s (c->state));
390 if (MESH_CONNECTION_DESTROYED == c->state)
392 LOG (GNUNET_ERROR_TYPE_DEBUG, "state not changing anymore\n");
395 LOG (GNUNET_ERROR_TYPE_DEBUG,
396 "Connection %s state is now %s\n",
397 GMC_2s (c), GMC_state2s (state));
403 * Callback called when a queued ACK message is sent.
405 * @param cls Closure (FC).
406 * @param c Connection this message was on.
407 * @param q Queue handler this call invalidates.
408 * @param type Type of message sent.
409 * @param fwd Was this a FWD going message?
410 * @param size Size of the message.
414 struct MeshConnection *c,
415 struct MeshConnectionQueue *q,
416 uint16_t type, int fwd, size_t size)
418 struct MeshFlowControl *fc = cls;
425 * Send an ACK on the connection, informing the predecessor about
426 * the available buffer space. Should not be called in case the peer
427 * is origin (no predecessor) in the @c fwd direction.
429 * Note that for fwd ack, the FWD mean forward *traffic* (root->dest),
430 * the ACK itself goes "back" (dest->root).
432 * @param c Connection on which to send the ACK.
433 * @param buffer How much space free to advertise?
434 * @param fwd Is this FWD ACK? (Going dest -> root)
435 * @param force Don't optimize out.
438 send_ack (struct MeshConnection *c, unsigned int buffer, int fwd, int force)
440 struct MeshFlowControl *next_fc;
441 struct MeshFlowControl *prev_fc;
442 struct GNUNET_MESH_ACK msg;
446 /* If origin, there is no connection to send ACKs. Wrong function! */
447 if (GMC_is_origin (c, fwd))
449 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection %s is origin in %s\n",
450 GMC_2s (c), GM_f2s (fwd));
455 next_fc = fwd ? &c->fwd_fc : &c->bck_fc;
456 prev_fc = fwd ? &c->bck_fc : &c->fwd_fc;
458 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection send %s ack on %s\n",
459 GM_f2s (fwd), GMC_2s (c));
461 /* Check if we need to transmit the ACK. */
462 delta = prev_fc->last_ack_sent - prev_fc->last_pid_recv;
463 if (3 < delta && buffer < delta && GNUNET_NO == force)
465 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer > 3\n");
466 LOG (GNUNET_ERROR_TYPE_DEBUG,
467 " last pid recv: %u, last ack sent: %u\n",
468 prev_fc->last_pid_recv, prev_fc->last_ack_sent);
472 /* Ok, ACK might be necessary, what PID to ACK? */
473 ack = prev_fc->last_pid_recv + buffer;
474 LOG (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
475 LOG (GNUNET_ERROR_TYPE_DEBUG,
476 " last pid %u, last ack %u, qmax %u, q %u\n",
477 prev_fc->last_pid_recv, prev_fc->last_ack_sent,
478 next_fc->queue_max, next_fc->queue_n);
479 if (ack == prev_fc->last_ack_sent && GNUNET_NO == force)
481 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
485 /* Check if message is already in queue */
486 if (NULL != prev_fc->ack_msg)
488 if (GM_is_pid_bigger (ack, prev_fc->last_ack_sent))
490 LOG (GNUNET_ERROR_TYPE_DEBUG, " canceling old ACK\n");
491 GMC_cancel (prev_fc->ack_msg);
492 /* GMC_cancel triggers ack_sent(), which clears fc->ack_msg */
496 LOG (GNUNET_ERROR_TYPE_DEBUG, " same ACK already in queue\n");
501 prev_fc->last_ack_sent = ack;
503 /* Build ACK message and send on connection */
504 msg.header.size = htons (sizeof (msg));
505 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK);
506 msg.ack = htonl (ack);
509 prev_fc->ack_msg = GMC_send_prebuilt_message (&msg.header, c,
516 * Callback called when a queued message is sent.
518 * Calculates the average time and connection packet tracking.
520 * @param cls Closure (ConnectionQueue Handle).
521 * @param c Connection this message was on.
522 * @param type Type of message sent.
523 * @param fwd Was this a FWD going message?
524 * @param size Size of the message.
525 * @param wait Time spent waiting for core (only the time for THIS message)
528 message_sent (void *cls,
529 struct MeshConnection *c, uint16_t type,
530 int fwd, size_t size,
531 struct GNUNET_TIME_Relative wait)
533 struct MeshConnectionPerformance *p;
534 struct MeshFlowControl *fc;
535 struct MeshConnectionQueue *q = cls;
539 fc = fwd ? &c->fwd_fc : &c->bck_fc;
540 LOG (GNUNET_ERROR_TYPE_DEBUG,
544 LOG (GNUNET_ERROR_TYPE_DEBUG, "! C_P- %p %u\n", c, c->pending_messages);
550 LOG (GNUNET_ERROR_TYPE_DEBUG, "! calling cont\n");
551 q->cont (q->cont_cls, c, q, type, fwd, size);
555 else if (type == GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED)
557 /* If NULL == q and ENCRYPTED == type, message must have been ch_mngmnt */
564 c->pending_messages--;
565 if (GNUNET_YES == c->destroy && 0 == c->pending_messages)
567 LOG (GNUNET_ERROR_TYPE_DEBUG, "! destroying connection!\n");
571 /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
574 case GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED:
576 LOG (GNUNET_ERROR_TYPE_DEBUG, "! Q_N- %p %u\n", fc, fc->queue_n);
577 if (GNUNET_NO == forced)
580 LOG (GNUNET_ERROR_TYPE_DEBUG,
581 "! accounting pid %u\n",
586 LOG (GNUNET_ERROR_TYPE_DEBUG,
587 "! forced, Q_N not accounting pid %u\n",
590 GMC_send_ack (c, fwd, GNUNET_NO);
593 case GNUNET_MESSAGE_TYPE_MESH_POLL:
597 case GNUNET_MESSAGE_TYPE_MESH_ACK:
604 LOG (GNUNET_ERROR_TYPE_DEBUG, "! message sent!\n");
607 return; /* Only endpoints are interested in timing. */
610 usecsperbyte = ((double) wait.rel_value_us) / size;
611 if (p->size == AVG_MSGS)
613 /* Array is full. Substract oldest value, add new one and store. */
614 p->avg -= (p->usecsperbyte[p->idx] / AVG_MSGS);
615 p->usecsperbyte[p->idx] = usecsperbyte;
616 p->avg += (p->usecsperbyte[p->idx] / AVG_MSGS);
620 /* Array not yet full. Add current value to avg and store. */
621 p->usecsperbyte[p->idx] = usecsperbyte;
623 p->avg += p->usecsperbyte[p->idx];
627 p->idx = (p->idx + 1) % AVG_MSGS;
632 * Get the previous hop in a connection
634 * @param c Connection.
636 * @return Previous peer in the connection.
638 static struct MeshPeer *
639 get_prev_hop (const struct MeshConnection *c)
643 if (0 == c->own_pos || c->path->length < 2)
644 id = c->path->peers[0];
646 id = c->path->peers[c->own_pos - 1];
648 return GMP_get_short (id);
653 * Get the next hop in a connection
655 * @param c Connection.
657 * @return Next peer in the connection.
659 static struct MeshPeer *
660 get_next_hop (const struct MeshConnection *c)
664 if ((c->path->length - 1) == c->own_pos || c->path->length < 2)
665 id = c->path->peers[c->path->length - 1];
667 id = c->path->peers[c->own_pos + 1];
669 return GMP_get_short (id);
674 * Get the hop in a connection.
676 * @param c Connection.
677 * @param fwd Next hop?
679 * @return Next peer in the connection.
681 static struct MeshPeer *
682 get_hop (struct MeshConnection *c, int fwd)
685 return get_next_hop (c);
686 return get_prev_hop (c);
691 * Is traffic coming from this sender 'FWD' traffic?
693 * @param c Connection to check.
694 * @param sender Peer identity of neighbor.
696 * @return #GNUNET_YES in case the sender is the 'prev' hop and therefore
697 * the traffic is 'FWD'.
698 * #GNUNET_NO for BCK.
699 * #GNUNET_SYSERR for errors.
702 is_fwd (const struct MeshConnection *c,
703 const struct GNUNET_PeerIdentity *sender)
707 id = GNUNET_PEER_search (sender);
708 if (GMP_get_short_id (get_prev_hop (c)) == id)
711 if (GMP_get_short_id (get_next_hop (c)) == id)
715 return GNUNET_SYSERR;
720 * Sends a CONNECTION ACK message in reponse to a received CONNECTION_CREATE
721 * or a first CONNECTION_ACK directed to us.
723 * @param connection Connection to confirm.
724 * @param fwd Should we send it FWD? (root->dest)
725 * (First (~SYNACK) goes BCK, second (~ACK) goes FWD)
728 send_connection_ack (struct MeshConnection *connection, int fwd)
730 struct MeshTunnel3 *t;
733 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send connection %s ACK\n",
735 GMP_queue_add (get_hop (connection, fwd), NULL,
736 GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK,
737 sizeof (struct GNUNET_MESH_ConnectionACK),
738 connection, fwd, &message_sent, NULL);
739 connection->pending_messages++;
740 if (MESH_TUNNEL3_NEW == GMT_get_cstate (t))
741 GMT_change_cstate (t, MESH_TUNNEL3_WAITING);
742 if (MESH_CONNECTION_READY != connection->state)
743 connection_change_state (connection, MESH_CONNECTION_SENT);
748 * Send a notification that a connection is broken.
750 * @param c Connection that is broken.
751 * @param id1 Peer that has disconnected.
752 * @param id2 Peer that has disconnected.
753 * @param fwd Direction towards which to send it.
756 send_broken (struct MeshConnection *c,
757 const struct GNUNET_PeerIdentity *id1,
758 const struct GNUNET_PeerIdentity *id2,
761 struct GNUNET_MESH_ConnectionBroken msg;
763 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectionBroken));
764 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN);
768 GMC_send_prebuilt_message (&msg.header, c, fwd, GNUNET_YES, NULL, NULL);
773 * Send keepalive packets for a connection.
775 * @param c Connection to keep alive..
776 * @param fwd Is this a FWD keepalive? (owner -> dest).
779 connection_keepalive (struct MeshConnection *c, int fwd)
781 struct GNUNET_MESH_ConnectionKeepAlive *msg;
782 size_t size = sizeof (struct GNUNET_MESH_ConnectionKeepAlive);
785 LOG (GNUNET_ERROR_TYPE_DEBUG,
786 "sending %s keepalive for connection %s]\n",
787 GM_f2s (fwd), GMC_2s (c));
789 msg = (struct GNUNET_MESH_ConnectionKeepAlive *) cbuf;
790 msg->header.size = htons (size);
791 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_KEEPALIVE);
793 msg->reserved = htonl (0);
795 GMC_send_prebuilt_message (&msg->header, c, fwd, GNUNET_YES, NULL, NULL);
800 * Send CONNECTION_{CREATE/ACK} packets for a connection.
802 * @param c Connection for which to send the message.
803 * @param fwd If #GNUNET_YES, send CREATE, otherwise send ACK.
806 connection_recreate (struct MeshConnection *c, int fwd)
808 LOG (GNUNET_ERROR_TYPE_DEBUG, "sending connection recreate\n");
812 send_connection_ack (c, GNUNET_NO);
817 * Generic connection timer management.
818 * Depending on the role of the peer in the connection will send the
819 * appropriate message (build or keepalive)
821 * @param c Conncetion to maintain.
825 connection_maintain (struct MeshConnection *c, int fwd)
827 if (GNUNET_NO != c->destroy)
830 if (MESH_TUNNEL3_SEARCHING == GMT_get_cstate (c->t))
832 /* TODO DHT GET with RO_BART */
837 case MESH_CONNECTION_NEW:
840 case MESH_CONNECTION_SENT:
841 connection_recreate (c, fwd);
843 case MESH_CONNECTION_READY:
844 connection_keepalive (c, fwd);
853 connection_fwd_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
855 struct MeshConnection *c = cls;
856 struct GNUNET_TIME_Relative delay;
858 c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
859 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
862 connection_maintain (c, GNUNET_YES);
863 delay = c->state == MESH_CONNECTION_READY ?
864 refresh_connection_time : create_connection_time;
865 c->fwd_maintenance_task = GNUNET_SCHEDULER_add_delayed (delay,
866 &connection_fwd_keepalive,
872 connection_bck_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
874 struct MeshConnection *c = cls;
875 struct GNUNET_TIME_Relative delay;
877 c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
878 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
881 connection_maintain (c, GNUNET_NO);
882 delay = c->state == MESH_CONNECTION_READY ?
883 refresh_connection_time : create_connection_time;
884 c->bck_maintenance_task = GNUNET_SCHEDULER_add_delayed (delay,
885 &connection_bck_keepalive,
891 * @brief Re-initiate traffic on this connection if necessary.
893 * Check if there is traffic queued towards this peer
894 * and the core transmit handle is NULL (traffic was stalled).
895 * If so, call core tmt rdy.
897 * @param c Connection on which initiate traffic.
898 * @param fwd Is this about fwd traffic?
901 connection_unlock_queue (struct MeshConnection *c, int fwd)
903 struct MeshPeer *peer;
905 LOG (GNUNET_ERROR_TYPE_DEBUG,
906 "connection_unlock_queue %s on %s\n",
907 GM_f2s (fwd), GMC_2s (c));
909 if (GMC_is_terminal (c, fwd))
911 LOG (GNUNET_ERROR_TYPE_DEBUG, " is terminal!\n");
915 peer = get_hop (c, fwd);
916 GMP_queue_unlock (peer, c);
921 * Cancel all transmissions that belong to a certain connection.
923 * If the connection is scheduled for destruction and no more messages are left,
924 * the connection will be destroyed by the continuation call.
926 * @param c Connection which to cancel. Might be destroyed during this call.
927 * @param fwd Cancel fwd traffic?
930 connection_cancel_queues (struct MeshConnection *c, int fwd)
932 struct MeshFlowControl *fc;
933 struct MeshPeer *peer;
935 LOG (GNUNET_ERROR_TYPE_DEBUG,
936 " *** Cancel %s queues for connection %s\n",
937 GM_f2s (fwd), GMC_2s (c));
944 fc = fwd ? &c->fwd_fc : &c->bck_fc;
945 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
947 GNUNET_SCHEDULER_cancel (fc->poll_task);
948 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
949 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** Cancel POLL in ccq for fc %p\n", fc);
951 peer = get_hop (c, fwd);
952 GMP_queue_cancel (peer, c);
957 * Function called if a connection has been stalled for a while,
958 * possibly due to a missed ACK. Poll the neighbor about its ACK status.
960 * @param cls Closure (poll ctx).
961 * @param tc TaskContext.
964 connection_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
968 * Callback called when a queued POLL message is sent.
970 * @param cls Closure (FC).
971 * @param c Connection this message was on.
972 * @param q Queue handler this call invalidates.
973 * @param type Type of message sent.
974 * @param fwd Was this a FWD going message?
975 * @param size Size of the message.
978 poll_sent (void *cls,
979 struct MeshConnection *c,
980 struct MeshConnectionQueue *q,
981 uint16_t type, int fwd, size_t size)
983 struct MeshFlowControl *fc = cls;
987 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL canceled on shutdown\n");
990 LOG (GNUNET_ERROR_TYPE_DEBUG,
991 " *** POLL sent for , scheduling new one!\n");
993 fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
994 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
995 &connection_poll, fc);
996 LOG (GNUNET_ERROR_TYPE_DEBUG, " task %u\n", fc->poll_task);
1001 * Function called if a connection has been stalled for a while,
1002 * possibly due to a missed ACK. Poll the neighbor about its ACK status.
1004 * @param cls Closure (poll ctx).
1005 * @param tc TaskContext.
1008 connection_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1010 struct MeshFlowControl *fc = cls;
1011 struct GNUNET_MESH_Poll msg;
1012 struct MeshConnection *c;
1014 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
1015 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1021 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** Polling!\n");
1022 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** connection [%s]\n", GMC_2s (c));
1023 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** %s\n",
1024 fc == &c->fwd_fc ? "FWD" : "BCK");
1026 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL);
1027 msg.header.size = htons (sizeof (msg));
1028 msg.pid = htonl (fc->last_pid_sent);
1029 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** last pid sent: %u!\n", fc->last_pid_sent);
1030 fc->poll_msg = GMC_send_prebuilt_message (&msg.header, c,
1031 fc == &c->fwd_fc, GNUNET_YES,
1037 * Timeout function due to lack of keepalive/traffic from the owner.
1038 * Destroys connection if called.
1040 * @param cls Closure (connection to destroy).
1041 * @param tc TaskContext.
1044 connection_fwd_timeout (void *cls,
1045 const struct GNUNET_SCHEDULER_TaskContext *tc)
1047 struct MeshConnection *c = cls;
1049 c->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
1050 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1053 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connection %s FWD timed out. Destroying.\n",
1055 if (GMC_is_origin (c, GNUNET_YES)) /* If local, leave. */
1066 * Timeout function due to lack of keepalive/traffic from the destination.
1067 * Destroys connection if called.
1069 * @param cls Closure (connection to destroy).
1070 * @param tc TaskContext
1073 connection_bck_timeout (void *cls,
1074 const struct GNUNET_SCHEDULER_TaskContext *tc)
1076 struct MeshConnection *c = cls;
1078 c->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
1079 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1082 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connection %s BCK timed out. Destroying.\n",
1085 if (GMC_is_origin (c, GNUNET_NO)) /* If local, leave. */
1096 * Resets the connection timeout task, some other message has done the
1098 * - For the first peer on the direction this means to send
1099 * a keepalive or a path confirmation message (either create or ACK).
1100 * - For all other peers, this means to destroy the connection,
1101 * due to lack of activity.
1102 * Starts the timeout if no timeout was running (connection just created).
1104 * @param c Connection whose timeout to reset.
1105 * @param fwd Is this forward?
1107 * TODO use heap to improve efficiency of scheduler.
1110 connection_reset_timeout (struct MeshConnection *c, int fwd)
1112 GNUNET_SCHEDULER_TaskIdentifier *ti;
1113 GNUNET_SCHEDULER_Task f;
1115 ti = fwd ? &c->fwd_maintenance_task : &c->bck_maintenance_task;
1117 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connection %s reset timeout\n", GM_f2s (fwd));
1119 if (GNUNET_SCHEDULER_NO_TASK != *ti)
1120 GNUNET_SCHEDULER_cancel (*ti);
1122 if (GMC_is_origin (c, fwd)) /* Startpoint */
1124 f = fwd ? &connection_fwd_keepalive : &connection_bck_keepalive;
1125 *ti = GNUNET_SCHEDULER_add_delayed (refresh_connection_time, f, c);
1127 else /* Relay, endpoint. */
1129 struct GNUNET_TIME_Relative delay;
1131 delay = GNUNET_TIME_relative_multiply (refresh_connection_time, 4);
1132 f = fwd ? &connection_fwd_timeout : &connection_bck_timeout;
1133 *ti = GNUNET_SCHEDULER_add_delayed (delay, f, c);
1139 * Add the connection to the list of both neighbors.
1141 * @param c Connection.
1143 * @return #GNUNET_OK if everything went fine
1144 * #GNUNET_SYSERR if the was an error and @c c is malformed.
1147 register_neighbors (struct MeshConnection *c)
1149 struct MeshPeer *next_peer;
1150 struct MeshPeer *prev_peer;
1152 next_peer = get_next_hop (c);
1153 prev_peer = get_prev_hop (c);
1155 LOG (GNUNET_ERROR_TYPE_DEBUG, "putting connection %s to next peer %s\n",
1156 GMC_2s (c), GMP_2s (next_peer));
1157 LOG (GNUNET_ERROR_TYPE_DEBUG, "putting connection %s to prev peer %s\n",
1158 GMC_2s (c), GMP_2s (prev_peer));
1160 if (GNUNET_NO == GMP_is_neighbor (next_peer)
1161 || GNUNET_NO == GMP_is_neighbor (prev_peer))
1163 if (GMC_is_origin (c, GNUNET_YES))
1164 GNUNET_STATISTICS_update (stats, "# local bad paths", 1, GNUNET_NO);
1165 GNUNET_STATISTICS_update (stats, "# bad paths", 1, GNUNET_NO);
1167 LOG (GNUNET_ERROR_TYPE_DEBUG, " register neighbors failed\n");
1168 LOG (GNUNET_ERROR_TYPE_DEBUG, " prev: %s, neighbor?: %d\n",
1169 GMP_2s (prev_peer), GMP_is_neighbor (prev_peer));
1170 LOG (GNUNET_ERROR_TYPE_DEBUG, " next: %s, neighbor?: %d\n",
1171 GMP_2s (next_peer), GMP_is_neighbor (next_peer));
1172 return GNUNET_SYSERR;
1175 GMP_add_connection (next_peer, c);
1176 GMP_add_connection (prev_peer, c);
1183 * Remove the connection from the list of both neighbors.
1185 * @param c Connection.
1188 unregister_neighbors (struct MeshConnection *c)
1190 struct MeshPeer *peer;
1192 peer = get_next_hop (c);
1193 if (GNUNET_OK != GMP_remove_connection (peer, c))
1195 GNUNET_assert (MESH_CONNECTION_NEW == c->state
1196 || MESH_CONNECTION_DESTROYED == c->state);
1197 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate: %u\n", c->state);
1198 if (NULL != c->t) GMT_debug (c->t);
1201 peer = get_prev_hop (c);
1202 if (GNUNET_OK != GMP_remove_connection (peer, c))
1204 GNUNET_assert (MESH_CONNECTION_NEW == c->state
1205 || MESH_CONNECTION_DESTROYED == c->state);
1206 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate: %u\n", c->state);
1207 if (NULL != c->t) GMT_debug (c->t);
1213 * Bind the connection to the peer and the tunnel to that peer.
1215 * If the peer has no tunnel, create one. Update tunnel and connection
1216 * data structres to reflect new status.
1218 * @param c Connection.
1222 add_to_peer (struct MeshConnection *c, struct MeshPeer *peer)
1224 GMP_add_tunnel (peer);
1225 c->t = GMP_get_tunnel (peer);
1226 GMT_add_connection (c->t, c);
1231 * Builds a path from a PeerIdentity array.
1233 * @param peers PeerIdentity array.
1234 * @param size Size of the @c peers array.
1235 * @param own_pos Output parameter: own position in the path.
1237 * @return Fixed and shortened path.
1239 static struct MeshPeerPath *
1240 build_path_from_peer_ids (struct GNUNET_PeerIdentity *peers,
1242 unsigned int *own_pos)
1244 struct MeshPeerPath *path;
1245 GNUNET_PEER_Id shortid;
1248 unsigned int offset;
1251 LOG (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
1252 path = path_new (size);
1255 for (i = 0; i < size; i++)
1257 LOG (GNUNET_ERROR_TYPE_DEBUG, " - %u: taking %s\n",
1258 i, GNUNET_i2s (&peers[i]));
1259 shortid = GNUNET_PEER_intern (&peers[i]);
1261 /* Check for loops / duplicates */
1262 for (j = 0; j < i - offset; j++)
1264 if (path->peers[j] == shortid)
1266 LOG (GNUNET_ERROR_TYPE_DEBUG, " already exists at pos %u\n", j);
1268 LOG (GNUNET_ERROR_TYPE_DEBUG, " offset now\n", offset);
1269 GNUNET_PEER_change_rc (shortid, -1);
1272 LOG (GNUNET_ERROR_TYPE_DEBUG, " storing at %u\n", i - offset);
1273 path->peers[i - offset] = shortid;
1274 if (path->peers[i] == myid)
1277 path->length -= offset;
1279 if (path->peers[*own_pos] != myid)
1281 /* create path: self not found in path through self */
1282 GNUNET_break_op (0);
1283 path_destroy (path);
1290 /******************************************************************************/
1291 /******************************** API ***********************************/
1292 /******************************************************************************/
1295 * Core handler for connection creation.
1297 * @param cls Closure (unused).
1298 * @param peer Sender (neighbor).
1299 * @param message Message.
1301 * @return GNUNET_OK to keep the connection open,
1302 * GNUNET_SYSERR to close it (signal serious error)
1305 GMC_handle_create (void *cls, const struct GNUNET_PeerIdentity *peer,
1306 const struct GNUNET_MessageHeader *message)
1308 struct GNUNET_MESH_ConnectionCreate *msg;
1309 struct GNUNET_PeerIdentity *id;
1310 struct GNUNET_HashCode *cid;
1311 struct MeshPeerPath *path;
1312 struct MeshPeer *dest_peer;
1313 struct MeshPeer *orig_peer;
1314 struct MeshConnection *c;
1315 unsigned int own_pos;
1318 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1319 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received a connection create msg\n");
1322 size = ntohs (message->size);
1323 if (size < sizeof (struct GNUNET_MESH_ConnectionCreate))
1325 GNUNET_break_op (0);
1329 /* Calculate hops */
1330 size -= sizeof (struct GNUNET_MESH_ConnectionCreate);
1331 if (size % sizeof (struct GNUNET_PeerIdentity))
1333 GNUNET_break_op (0);
1336 size /= sizeof (struct GNUNET_PeerIdentity);
1339 GNUNET_break_op (0);
1342 LOG (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
1344 /* Get parameters */
1345 msg = (struct GNUNET_MESH_ConnectionCreate *) message;
1347 id = (struct GNUNET_PeerIdentity *) &msg[1];
1348 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection %s (%s->).\n",
1349 GNUNET_h2s (cid), GNUNET_i2s (id));
1351 /* Create connection */
1352 c = connection_get (cid);
1355 path = build_path_from_peer_ids ((struct GNUNET_PeerIdentity *) &msg[1],
1359 LOG (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
1360 GMP_add_path_to_all (path, GNUNET_NO);
1361 LOG (GNUNET_ERROR_TYPE_DEBUG, " Creating connection\n");
1362 c = GMC_new (cid, NULL, path_duplicate (path), own_pos);
1365 path_destroy (path);
1368 connection_reset_timeout (c, GNUNET_YES);
1372 path = path_duplicate (c->path);
1374 if (MESH_CONNECTION_NEW == c->state)
1375 connection_change_state (c, MESH_CONNECTION_SENT);
1377 /* Remember peers */
1378 dest_peer = GMP_get (&id[size - 1]);
1379 orig_peer = GMP_get (&id[0]);
1381 /* Is it a connection to us? */
1382 if (c->own_pos == size - 1)
1384 LOG (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
1385 GMP_add_path_to_origin (orig_peer, path_duplicate (path), GNUNET_YES);
1387 add_to_peer (c, orig_peer);
1388 if (MESH_TUNNEL3_NEW == GMT_get_cstate (c->t))
1389 GMT_change_cstate (c->t, MESH_TUNNEL3_WAITING);
1391 send_connection_ack (c, GNUNET_NO);
1392 if (MESH_CONNECTION_SENT == c->state)
1393 connection_change_state (c, MESH_CONNECTION_ACK);
1395 /* Keep tunnel alive in direction dest->owner*/
1396 if (GNUNET_SCHEDULER_NO_TASK == c->bck_maintenance_task)
1398 c->bck_maintenance_task =
1399 GNUNET_SCHEDULER_add_delayed (create_connection_time,
1400 &connection_bck_keepalive, c);
1405 /* It's for somebody else! Retransmit. */
1406 LOG (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
1407 GMP_add_path (dest_peer, path_duplicate (path), GNUNET_NO);
1408 GMP_add_path_to_origin (orig_peer, path_duplicate (path), GNUNET_NO);
1409 GMC_send_prebuilt_message (message, c, GNUNET_YES, GNUNET_YES,
1412 path_destroy (path);
1418 * Core handler for path confirmations.
1420 * @param cls closure
1421 * @param message message
1422 * @param peer peer identity this notification is about
1424 * @return GNUNET_OK to keep the connection open,
1425 * GNUNET_SYSERR to close it (signal serious error)
1428 GMC_handle_confirm (void *cls, const struct GNUNET_PeerIdentity *peer,
1429 const struct GNUNET_MessageHeader *message)
1431 struct GNUNET_MESH_ConnectionACK *msg;
1432 struct MeshConnection *c;
1433 struct MeshPeerPath *p;
1434 struct MeshPeer *pi;
1435 enum MeshConnectionState oldstate;
1438 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1439 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received a connection ACK msg\n");
1440 msg = (struct GNUNET_MESH_ConnectionACK *) message;
1441 LOG (GNUNET_ERROR_TYPE_DEBUG, " on connection %s\n",
1442 GNUNET_h2s (&msg->cid));
1443 c = connection_get (&msg->cid);
1446 GNUNET_STATISTICS_update (stats, "# control on unknown connection",
1448 LOG (GNUNET_ERROR_TYPE_DEBUG, " don't know the connection!\n");
1452 if (GNUNET_NO != c->destroy)
1454 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection being destroyed\n");
1458 oldstate = c->state;
1459 LOG (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n", GNUNET_i2s (peer));
1460 pi = GMP_get (peer);
1461 if (get_next_hop (c) == pi)
1463 LOG (GNUNET_ERROR_TYPE_DEBUG, " SYNACK\n");
1465 if (MESH_CONNECTION_SENT == oldstate)
1466 connection_change_state (c, MESH_CONNECTION_ACK);
1468 else if (get_prev_hop (c) == pi)
1470 LOG (GNUNET_ERROR_TYPE_DEBUG, " ACK\n");
1472 connection_change_state (c, MESH_CONNECTION_READY);
1476 GNUNET_break_op (0);
1480 connection_reset_timeout (c, fwd);
1482 /* Add path to peers? */
1486 GMP_add_path_to_all (p, GNUNET_YES);
1493 /* Message for us as creator? */
1494 if (GMC_is_origin (c, GNUNET_YES))
1496 if (GNUNET_NO != fwd)
1498 GNUNET_break_op (0);
1501 LOG (GNUNET_ERROR_TYPE_DEBUG, " Connection (SYN)ACK for us!\n");
1503 /* If just created, cancel the short timeout and start a long one */
1504 if (MESH_CONNECTION_SENT == oldstate)
1505 connection_reset_timeout (c, GNUNET_YES);
1507 /* Change connection state */
1508 connection_change_state (c, MESH_CONNECTION_READY);
1509 send_connection_ack (c, GNUNET_YES);
1511 /* Change tunnel state, trigger KX */
1512 if (MESH_TUNNEL3_WAITING == GMT_get_cstate (c->t))
1513 GMT_change_cstate (c->t, MESH_TUNNEL3_READY);
1518 /* Message for us as destination? */
1519 if (GMC_is_terminal (c, GNUNET_YES))
1521 if (GNUNET_YES != fwd)
1523 GNUNET_break_op (0);
1526 LOG (GNUNET_ERROR_TYPE_DEBUG, " Connection ACK for us!\n");
1528 /* If just created, cancel the short timeout and start a long one */
1529 if (MESH_CONNECTION_ACK == oldstate)
1530 connection_reset_timeout (c, GNUNET_NO);
1532 /* Change tunnel state */
1533 if (MESH_TUNNEL3_WAITING == GMT_get_cstate (c->t))
1534 GMT_change_cstate (c->t, MESH_TUNNEL3_READY);
1539 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
1540 GMC_send_prebuilt_message (message, c, fwd, GNUNET_YES, NULL, NULL);
1546 * Core handler for notifications of broken paths
1548 * @param cls Closure (unused).
1549 * @param id Peer identity of sending neighbor.
1550 * @param message Message.
1552 * @return GNUNET_OK to keep the connection open,
1553 * GNUNET_SYSERR to close it (signal serious error)
1556 GMC_handle_broken (void* cls,
1557 const struct GNUNET_PeerIdentity* id,
1558 const struct GNUNET_MessageHeader* message)
1560 struct GNUNET_MESH_ConnectionBroken *msg;
1561 struct MeshConnection *c;
1564 LOG (GNUNET_ERROR_TYPE_DEBUG,
1565 "Received a CONNECTION BROKEN msg from %s\n", GNUNET_i2s (id));
1566 msg = (struct GNUNET_MESH_ConnectionBroken *) message;
1567 LOG (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
1568 GNUNET_i2s (&msg->peer1));
1569 LOG (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
1570 GNUNET_i2s (&msg->peer2));
1571 c = connection_get (&msg->cid);
1574 GNUNET_break_op (0);
1578 fwd = is_fwd (c, id);
1579 if (GMC_is_terminal (c, fwd))
1581 if (0 < c->pending_messages)
1582 c->destroy = GNUNET_YES;
1588 GMC_send_prebuilt_message (message, c, fwd, GNUNET_YES, NULL, NULL);
1589 c->destroy = GNUNET_YES;
1590 connection_cancel_queues (c, !fwd);
1599 * Core handler for tunnel destruction
1601 * @param cls Closure (unused).
1602 * @param peer Peer identity of sending neighbor.
1603 * @param message Message.
1605 * @return GNUNET_OK to keep the connection open,
1606 * GNUNET_SYSERR to close it (signal serious error)
1609 GMC_handle_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
1610 const struct GNUNET_MessageHeader *message)
1612 struct GNUNET_MESH_ConnectionDestroy *msg;
1613 struct MeshConnection *c;
1616 msg = (struct GNUNET_MESH_ConnectionDestroy *) message;
1617 LOG (GNUNET_ERROR_TYPE_DEBUG,
1618 "Got a CONNECTION DESTROY message from %s\n",
1620 LOG (GNUNET_ERROR_TYPE_DEBUG,
1621 " for connection %s\n",
1622 GNUNET_h2s (&msg->cid));
1623 c = connection_get (&msg->cid);
1626 /* Probably already got the message from another path,
1627 * destroyed the tunnel and retransmitted to children.
1630 GNUNET_STATISTICS_update (stats, "# control on unknown connection",
1632 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection unknown: already destroyed?\n");
1635 fwd = is_fwd (c, peer);
1636 if (GNUNET_SYSERR == fwd)
1638 GNUNET_break_op (0); /* FIXME */
1641 if (GNUNET_NO == GMC_is_terminal (c, fwd))
1642 GMC_send_prebuilt_message (message, c, fwd, GNUNET_YES, NULL, NULL);
1643 else if (0 == c->pending_messages)
1645 LOG (GNUNET_ERROR_TYPE_DEBUG, "! directly destroying connection!\n");
1649 c->destroy = GNUNET_YES;
1650 c->state = MESH_CONNECTION_DESTROYED;
1653 GMT_remove_connection (c->t, c);
1661 * Generic handler for mesh network encrypted traffic.
1663 * @param peer Peer identity this notification is about.
1664 * @param msg Encrypted message.
1666 * @return GNUNET_OK to keep the connection open,
1667 * GNUNET_SYSERR to close it (signal serious error)
1670 handle_mesh_encrypted (const struct GNUNET_PeerIdentity *peer,
1671 const struct GNUNET_MESH_Encrypted *msg)
1673 struct MeshConnection *c;
1674 struct MeshPeer *neighbor;
1675 struct MeshFlowControl *fc;
1676 GNUNET_PEER_Id peer_id;
1684 size = ntohs (msg->header.size);
1686 sizeof (struct GNUNET_MESH_Encrypted) +
1687 sizeof (struct GNUNET_MessageHeader))
1689 GNUNET_break_op (0);
1692 type = ntohs (msg->header.type);
1693 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1694 LOG (GNUNET_ERROR_TYPE_DEBUG, "got a %s message (#%u) from %s\n",
1695 GM_m2s (type), ntohl (msg->pid), GNUNET_i2s (peer));
1697 /* Check connection */
1698 c = connection_get (&msg->cid);
1701 GNUNET_STATISTICS_update (stats, "# unknown connection", 1, GNUNET_NO);
1702 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING enc on unknown connection %s\n",
1703 GNUNET_h2s (&msg->cid));
1707 LOG (GNUNET_ERROR_TYPE_DEBUG, " on connection %s\n", GMC_2s (c));
1709 /* Check if origin is as expected */
1710 neighbor = get_prev_hop (c);
1711 peer_id = GNUNET_PEER_search (peer);
1712 if (peer_id == GMP_get_short_id (neighbor))
1718 neighbor = get_next_hop (c);
1719 if (peer_id == GMP_get_short_id (neighbor))
1725 /* Unexpected peer sending traffic on a connection. */
1726 GNUNET_break_op (0);
1732 fc = fwd ? &c->bck_fc : &c->fwd_fc;
1733 pid = ntohl (msg->pid);
1734 if (GM_is_pid_bigger (pid, fc->last_ack_sent))
1736 GNUNET_STATISTICS_update (stats, "# unsolicited message", 1, GNUNET_NO);
1737 LOG (GNUNET_ERROR_TYPE_DEBUG,
1738 "WARNING Received PID %u, (prev %u), ACK %u\n",
1739 pid, fc->last_pid_recv, fc->last_ack_sent);
1742 if (GNUNET_NO == GM_is_pid_bigger (pid, fc->last_pid_recv))
1744 GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO);
1745 LOG (GNUNET_ERROR_TYPE_DEBUG,
1746 " Pid %u not expected (%u+), dropping!\n",
1747 pid, fc->last_pid_recv + 1);
1750 if (MESH_CONNECTION_SENT == c->state || MESH_CONNECTION_ACK == c->state)
1751 connection_change_state (c, MESH_CONNECTION_READY);
1752 connection_reset_timeout (c, fwd);
1753 fc->last_pid_recv = pid;
1755 /* Is this message for us? */
1756 if (GMC_is_terminal (c, fwd))
1758 LOG (GNUNET_ERROR_TYPE_DEBUG, " message for us!\n");
1759 GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO);
1763 GNUNET_break (GNUNET_NO != c->destroy);
1766 fc->last_pid_recv = pid;
1767 GMT_handle_encrypted (c->t, msg);
1768 GMC_send_ack (c, fwd, GNUNET_NO);
1772 /* Message not for us: forward to next hop */
1773 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
1774 ttl = ntohl (msg->ttl);
1775 LOG (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
1778 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
1779 LOG (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
1780 GMC_send_ack (c, fwd, GNUNET_NO);
1784 GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
1785 GMC_send_prebuilt_message (&msg->header, c, fwd, GNUNET_NO, NULL, NULL);
1791 * Generic handler for mesh network encrypted traffic.
1793 * @param peer Peer identity this notification is about.
1794 * @param msg Encrypted message.
1796 * @return GNUNET_OK to keep the connection open,
1797 * GNUNET_SYSERR to close it (signal serious error)
1800 handle_mesh_kx (const struct GNUNET_PeerIdentity *peer,
1801 const struct GNUNET_MESH_KX *msg)
1803 struct MeshConnection *c;
1804 struct MeshPeer *neighbor;
1805 GNUNET_PEER_Id peer_id;
1811 size = ntohs (msg->header.size);
1813 sizeof (struct GNUNET_MESH_Encrypted) +
1814 sizeof (struct GNUNET_MessageHeader))
1816 GNUNET_break_op (0);
1819 type = ntohs (msg->header.type);
1820 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1821 LOG (GNUNET_ERROR_TYPE_DEBUG, "got a %s message from %s\n",
1822 GM_m2s (type), GNUNET_i2s (peer));
1824 /* Check connection */
1825 c = connection_get (&msg->cid);
1828 GNUNET_STATISTICS_update (stats, "# unknown connection", 1, GNUNET_NO);
1829 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING kx on unknown connection %s\n",
1830 GNUNET_h2s (&msg->cid));
1833 LOG (GNUNET_ERROR_TYPE_DEBUG, " on connection %s\n", GMC_2s (c));
1835 /* Check if origin is as expected */
1836 neighbor = get_prev_hop (c);
1837 peer_id = GNUNET_PEER_search (peer);
1838 if (peer_id == GMP_get_short_id (neighbor))
1844 neighbor = get_next_hop (c);
1845 if (peer_id == GMP_get_short_id (neighbor))
1851 /* Unexpected peer sending traffic on a connection. */
1852 GNUNET_break_op (0);
1857 /* Count as connection confirmation. */
1858 if (MESH_CONNECTION_SENT == c->state || MESH_CONNECTION_ACK == c->state)
1860 connection_change_state (c, MESH_CONNECTION_READY);
1863 if (MESH_TUNNEL3_WAITING == GMT_get_cstate (c->t))
1864 GMT_change_cstate (c->t, MESH_TUNNEL3_READY);
1867 connection_reset_timeout (c, fwd);
1869 /* Is this message for us? */
1870 if (GMC_is_terminal (c, fwd))
1872 LOG (GNUNET_ERROR_TYPE_DEBUG, " message for us!\n");
1873 GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO);
1879 GMT_handle_kx (c->t, &msg[1].header);
1883 /* Message not for us: forward to next hop */
1884 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
1885 GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
1886 GMC_send_prebuilt_message (&msg->header, c, fwd, GNUNET_NO, NULL, NULL);
1893 * Core handler for encrypted mesh network traffic (channel mgmt, data).
1895 * @param cls Closure (unused).
1896 * @param message Message received.
1897 * @param peer Peer who sent the message.
1899 * @return GNUNET_OK to keep the connection open,
1900 * GNUNET_SYSERR to close it (signal serious error)
1903 GMC_handle_encrypted (void *cls, const struct GNUNET_PeerIdentity *peer,
1904 const struct GNUNET_MessageHeader *message)
1906 return handle_mesh_encrypted (peer,
1907 (struct GNUNET_MESH_Encrypted *)message);
1912 * Core handler for key exchange traffic (ephemeral key, ping, pong).
1914 * @param cls Closure (unused).
1915 * @param message Message received.
1916 * @param peer Peer who sent the message.
1918 * @return GNUNET_OK to keep the connection open,
1919 * GNUNET_SYSERR to close it (signal serious error)
1922 GMC_handle_kx (void *cls, const struct GNUNET_PeerIdentity *peer,
1923 const struct GNUNET_MessageHeader *message)
1925 return handle_mesh_kx (peer,
1926 (struct GNUNET_MESH_KX *) message);
1931 * Core handler for mesh network traffic point-to-point acks.
1933 * @param cls closure
1934 * @param message message
1935 * @param peer peer identity this notification is about
1937 * @return GNUNET_OK to keep the connection open,
1938 * GNUNET_SYSERR to close it (signal serious error)
1941 GMC_handle_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
1942 const struct GNUNET_MessageHeader *message)
1944 struct GNUNET_MESH_ACK *msg;
1945 struct MeshConnection *c;
1946 struct MeshFlowControl *fc;
1951 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
1952 LOG (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
1954 msg = (struct GNUNET_MESH_ACK *) message;
1956 c = connection_get (&msg->cid);
1960 GNUNET_STATISTICS_update (stats, "# ack on unknown connection", 1,
1965 /* Is this a forward or backward ACK? */
1966 id = GNUNET_PEER_search (peer);
1967 if (GMP_get_short_id (get_next_hop (c)) == id)
1969 LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
1973 else if (GMP_get_short_id (get_prev_hop (c)) == id)
1975 LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
1981 GNUNET_break_op (0);
1985 ack = ntohl (msg->ack);
1986 LOG (GNUNET_ERROR_TYPE_DEBUG, " ACK %u (was %u)\n",
1987 ack, fc->last_ack_recv);
1988 if (GM_is_pid_bigger (ack, fc->last_ack_recv))
1989 fc->last_ack_recv = ack;
1991 /* Cancel polling if the ACK is big enough. */
1992 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task &&
1993 GM_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
1995 LOG (GNUNET_ERROR_TYPE_DEBUG, " Cancel poll\n");
1996 GNUNET_SCHEDULER_cancel (fc->poll_task);
1997 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
1998 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
2001 connection_unlock_queue (c, fwd);
2008 * Core handler for mesh network traffic point-to-point ack polls.
2010 * @param cls closure
2011 * @param message message
2012 * @param peer peer identity this notification is about
2014 * @return GNUNET_OK to keep the connection open,
2015 * GNUNET_SYSERR to close it (signal serious error)
2018 GMC_handle_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
2019 const struct GNUNET_MessageHeader *message)
2021 struct GNUNET_MESH_Poll *msg;
2022 struct MeshConnection *c;
2023 struct MeshFlowControl *fc;
2028 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n\n");
2029 LOG (GNUNET_ERROR_TYPE_DEBUG,
2030 "Got a POLL message from %s!\n",
2033 msg = (struct GNUNET_MESH_Poll *) message;
2035 c = connection_get (&msg->cid);
2039 GNUNET_STATISTICS_update (stats, "# poll on unknown connection", 1,
2041 LOG (GNUNET_ERROR_TYPE_DEBUG,
2042 "WARNING POLL message on unknown connection %s!\n",
2043 GNUNET_h2s (&msg->cid));
2047 /* Is this a forward or backward ACK?
2048 * Note: a poll should never be needed in a loopback case,
2049 * since there is no possiblility of packet loss there, so
2050 * this way of discerining FWD/BCK should not be a problem.
2052 id = GNUNET_PEER_search (peer);
2053 if (GMP_get_short_id (get_next_hop (c)) == id)
2055 LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD FC\n");
2058 else if (GMP_get_short_id (get_prev_hop (c)) == id)
2060 LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK FC\n");
2065 GNUNET_break_op (0);
2069 pid = ntohl (msg->pid);
2070 LOG (GNUNET_ERROR_TYPE_DEBUG, " PID %u, OLD %u\n", pid, fc->last_pid_recv);
2071 fc->last_pid_recv = pid;
2072 fwd = fc == &c->bck_fc;
2073 GMC_send_ack (c, fwd, GNUNET_YES);
2080 * Core handler for mesh keepalives.
2082 * @param cls closure
2083 * @param message message
2084 * @param peer peer identity this notification is about
2085 * @return GNUNET_OK to keep the connection open,
2086 * GNUNET_SYSERR to close it (signal serious error)
2088 * TODO: Check who we got this from, to validate route.
2091 GMC_handle_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
2092 const struct GNUNET_MessageHeader *message)
2094 struct GNUNET_MESH_ConnectionKeepAlive *msg;
2095 struct MeshConnection *c;
2096 struct MeshPeer *neighbor;
2097 GNUNET_PEER_Id peer_id;
2100 msg = (struct GNUNET_MESH_ConnectionKeepAlive *) message;
2101 LOG (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
2104 c = connection_get (&msg->cid);
2107 GNUNET_STATISTICS_update (stats, "# keepalive on unknown connection", 1,
2112 /* Check if origin is as expected TODO refactor and reuse */
2113 peer_id = GNUNET_PEER_search (peer);
2114 neighbor = get_prev_hop (c);
2115 if (peer_id == GMP_get_short_id (neighbor))
2121 neighbor = get_next_hop (c);
2122 if (peer_id == GMP_get_short_id (neighbor))
2128 GNUNET_break_op (0);
2133 connection_change_state (c, MESH_CONNECTION_READY);
2134 connection_reset_timeout (c, fwd);
2136 if (GMC_is_terminal (c, fwd))
2139 GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
2140 GMC_send_prebuilt_message (message, c, fwd, GNUNET_YES, NULL, NULL);
2147 * Send an ACK on the appropriate connection/channel, depending on
2148 * the direction and the position of the peer.
2150 * @param c Which connection to send the hop-by-hop ACK.
2151 * @param fwd Is this a fwd ACK? (will go dest->root).
2152 * @param force Send the ACK even if suboptimal (e.g. requested by POLL).
2155 GMC_send_ack (struct MeshConnection *c, int fwd, int force)
2157 unsigned int buffer;
2159 LOG (GNUNET_ERROR_TYPE_DEBUG,
2160 "GMC send %s ACK on %s\n",
2161 GM_f2s (fwd), GMC_2s (c));
2169 if (GNUNET_NO != c->destroy)
2171 LOG (GNUNET_ERROR_TYPE_DEBUG, " being destroyed, why bother...\n");
2175 /* Get available buffer space */
2176 if (GMC_is_terminal (c, fwd))
2178 LOG (GNUNET_ERROR_TYPE_DEBUG, " getting from all channels\n");
2179 buffer = GMT_get_channels_buffer (c->t);
2183 LOG (GNUNET_ERROR_TYPE_DEBUG, " getting from one connection\n");
2184 buffer = GMC_get_buffer (c, fwd);
2186 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer available: %u\n", buffer);
2187 if (0 == buffer && GNUNET_NO == force)
2190 /* Send available buffer space */
2191 if (GMC_is_origin (c, fwd))
2193 GNUNET_assert (NULL != c->t);
2194 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on channels...\n");
2195 GMT_unchoke_channels (c->t);
2199 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on connection\n");
2200 send_ack (c, buffer, fwd, force);
2206 * Initialize the connections subsystem
2208 * @param c Configuration handle.
2211 GMC_init (const struct GNUNET_CONFIGURATION_Handle *c)
2213 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
2215 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
2218 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
2219 "MESH", "MAX_MSGS_QUEUE", "MISSING");
2220 GNUNET_SCHEDULER_shutdown ();
2225 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_CONNECTIONS",
2228 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
2229 "MESH", "MAX_CONNECTIONS", "MISSING");
2230 GNUNET_SCHEDULER_shutdown ();
2235 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_CONNECTION_TIME",
2236 &refresh_connection_time))
2238 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
2239 "MESH", "REFRESH_CONNECTION_TIME", "MISSING");
2240 GNUNET_SCHEDULER_shutdown ();
2243 create_connection_time = GNUNET_TIME_UNIT_SECONDS;
2244 connections = GNUNET_CONTAINER_multihashmap_create (1024, GNUNET_YES);
2249 * Destroy each connection on shutdown.
2251 * @param cls Closure (unused).
2252 * @param key Current key code (CID, unused).
2253 * @param value Value in the hash map (connection)
2255 * @return #GNUNET_YES, because we should continue to iterate,
2258 shutdown_iterator (void *cls,
2259 const struct GNUNET_HashCode *key,
2262 struct MeshConnection *c = value;
2270 * Shut down the connections subsystem.
2275 GNUNET_CONTAINER_multihashmap_iterate (connections, &shutdown_iterator, NULL);
2276 GNUNET_CONTAINER_multihashmap_destroy (connections);
2281 struct MeshConnection *
2282 GMC_new (const struct GNUNET_HashCode *cid,
2283 struct MeshTunnel3 *t,
2284 struct MeshPeerPath *p,
2285 unsigned int own_pos)
2287 struct MeshConnection *c;
2289 c = GNUNET_new (struct MeshConnection);
2291 GNUNET_assert (GNUNET_OK ==
2292 GNUNET_CONTAINER_multihashmap_put (connections,
2294 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2295 fc_init (&c->fwd_fc);
2296 fc_init (&c->bck_fc);
2301 GNUNET_assert (own_pos <= p->length - 1);
2302 c->own_pos = own_pos;
2305 if (GNUNET_OK != register_neighbors (c))
2309 path_invalidate (c->path);
2319 c->fwd_maintenance_task =
2320 GNUNET_SCHEDULER_add_delayed (create_connection_time,
2321 &connection_fwd_keepalive, c);
2329 GMC_destroy (struct MeshConnection *c)
2337 if (2 == c->destroy) /* cancel queues -> GMP_queue_cancel -> q_destroy -> */
2338 return; /* -> message_sent -> GMC_destroy. Don't loop. */
2341 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying connection %s\n", GMC_2s (c));
2342 LOG (GNUNET_ERROR_TYPE_DEBUG, " fc's f: %p, b: %p\n",
2343 &c->fwd_fc, &c->bck_fc);
2344 LOG (GNUNET_ERROR_TYPE_DEBUG, " fc tasks f: %u, b: %u\n",
2345 c->fwd_fc.poll_task, c->bck_fc.poll_task);
2347 /* Cancel all traffic */
2348 if (NULL != c->path)
2350 connection_cancel_queues (c, GNUNET_YES);
2351 connection_cancel_queues (c, GNUNET_NO);
2352 unregister_neighbors (c);
2355 LOG (GNUNET_ERROR_TYPE_DEBUG, " fc tasks f: %u, b: %u\n",
2356 c->fwd_fc.poll_task, c->bck_fc.poll_task);
2358 /* Cancel maintainance task (keepalive/timeout) */
2359 if (NULL != c->fwd_fc.poll_msg)
2361 GMC_cancel (c->fwd_fc.poll_msg);
2362 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL msg FWD canceled\n");
2364 if (NULL != c->bck_fc.poll_msg)
2366 GMC_cancel (c->bck_fc.poll_msg);
2367 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL msg BCK canceled\n");
2370 /* Delete from tunnel */
2372 GMT_remove_connection (c->t, c);
2374 if (GNUNET_NO == GMC_is_origin (c, GNUNET_YES) && NULL != c->path)
2375 path_destroy (c->path);
2376 if (GNUNET_SCHEDULER_NO_TASK != c->fwd_maintenance_task)
2377 GNUNET_SCHEDULER_cancel (c->fwd_maintenance_task);
2378 if (GNUNET_SCHEDULER_NO_TASK != c->bck_maintenance_task)
2379 GNUNET_SCHEDULER_cancel (c->bck_maintenance_task);
2380 if (GNUNET_SCHEDULER_NO_TASK != c->fwd_fc.poll_task)
2382 GNUNET_SCHEDULER_cancel (c->fwd_fc.poll_task);
2383 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL FWD canceled\n");
2385 if (GNUNET_SCHEDULER_NO_TASK != c->bck_fc.poll_task)
2387 GNUNET_SCHEDULER_cancel (c->bck_fc.poll_task);
2388 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL BCK canceled\n");
2391 GNUNET_break (GNUNET_YES ==
2392 GNUNET_CONTAINER_multihashmap_remove (connections, &c->id, c));
2394 GNUNET_STATISTICS_update (stats, "# connections", -1, GNUNET_NO);
2399 * Get the connection ID.
2401 * @param c Connection to get the ID from.
2403 * @return ID of the connection.
2405 const struct GNUNET_HashCode *
2406 GMC_get_id (const struct MeshConnection *c)
2413 * Get the connection path.
2415 * @param c Connection to get the path from.
2417 * @return path used by the connection.
2419 const struct MeshPeerPath *
2420 GMC_get_path (const struct MeshConnection *c)
2422 if (GNUNET_NO == c->destroy)
2429 * Get the connection state.
2431 * @param c Connection to get the state from.
2433 * @return state of the connection.
2435 enum MeshConnectionState
2436 GMC_get_state (const struct MeshConnection *c)
2442 * Get the connection tunnel.
2444 * @param c Connection to get the tunnel from.
2446 * @return tunnel of the connection.
2448 struct MeshTunnel3 *
2449 GMC_get_tunnel (const struct MeshConnection *c)
2456 * Get free buffer space in a connection.
2458 * @param c Connection.
2459 * @param fwd Is query about FWD traffic?
2461 * @return Free buffer space [0 - max_msgs_queue/max_connections]
2464 GMC_get_buffer (struct MeshConnection *c, int fwd)
2466 struct MeshFlowControl *fc;
2468 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2470 return (fc->queue_max - fc->queue_n);
2474 * Get how many messages have we allowed to send to us from a direction.
2476 * @param c Connection.
2477 * @param fwd Are we asking about traffic from FWD (BCK messages)?
2479 * @return last_ack_sent - last_pid_recv
2482 GMC_get_allowed (struct MeshConnection *c, int fwd)
2484 struct MeshFlowControl *fc;
2486 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2487 if (GM_is_pid_bigger(fc->last_pid_recv, fc->last_ack_sent))
2491 return (fc->last_ack_sent - fc->last_pid_recv);
2495 * Get messages queued in a connection.
2497 * @param c Connection.
2498 * @param fwd Is query about FWD traffic?
2500 * @return Number of messages queued.
2503 GMC_get_qn (struct MeshConnection *c, int fwd)
2505 struct MeshFlowControl *fc;
2507 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2514 * Allow the connection to advertise a buffer of the given size.
2516 * The connection will send an @c fwd ACK message (so: in direction !fwd)
2517 * allowing up to last_pid_recv + buffer.
2519 * @param c Connection.
2520 * @param buffer How many more messages the connection can accept.
2521 * @param fwd Is this about FWD traffic? (The ack will go dest->root).
2524 GMC_allow (struct MeshConnection *c, unsigned int buffer, int fwd)
2526 LOG (GNUNET_ERROR_TYPE_DEBUG, " allowing %s %u messages %s\n",
2527 GMC_2s (c), buffer, GM_f2s (fwd));
2528 send_ack (c, buffer, fwd, GNUNET_NO);
2533 * Notify other peers on a connection of a broken link. Mark connections
2534 * to destroy after all traffic has been sent.
2536 * @param c Connection on which there has been a disconnection.
2537 * @param peer Peer that disconnected.
2540 GMC_notify_broken (struct MeshConnection *c,
2541 struct MeshPeer *peer)
2545 LOG (GNUNET_ERROR_TYPE_DEBUG,
2546 " notify broken on %s due to %s disconnect\n",
2547 GMC_2s (c), GMP_2s (peer));
2549 fwd = peer == get_prev_hop (c);
2551 if (GNUNET_YES == GMC_is_terminal (c, fwd))
2553 /* Local shutdown, no one to notify about this. */
2557 if (GNUNET_NO == c->destroy)
2558 send_broken (c, &my_full_id, GMP_get_id (peer), fwd);
2560 /* Connection will have at least one pending message
2561 * (the one we just scheduled), so no point in checking whether to
2562 * destroy immediately. */
2563 c->destroy = GNUNET_YES;
2564 c->state = MESH_CONNECTION_DESTROYED;
2567 * Cancel all queues, if no message is left, connection will be destroyed.
2569 connection_cancel_queues (c, !fwd);
2576 * Is this peer the first one on the connection?
2578 * @param c Connection.
2579 * @param fwd Is this about fwd traffic?
2581 * @return #GNUNET_YES if origin, #GNUNET_NO if relay/terminal.
2584 GMC_is_origin (struct MeshConnection *c, int fwd)
2586 if (!fwd && c->path->length - 1 == c->own_pos )
2588 if (fwd && 0 == c->own_pos)
2595 * Is this peer the last one on the connection?
2597 * @param c Connection.
2598 * @param fwd Is this about fwd traffic?
2599 * Note that the ROOT is the terminal for BCK traffic!
2601 * @return #GNUNET_YES if terminal, #GNUNET_NO if relay/origin.
2604 GMC_is_terminal (struct MeshConnection *c, int fwd)
2606 return GMC_is_origin (c, !fwd);
2611 * See if we are allowed to send by the next hop in the given direction.
2613 * @param c Connection.
2614 * @param fwd Is this about fwd traffic?
2616 * @return #GNUNET_YES in case it's OK to send.
2619 GMC_is_sendable (struct MeshConnection *c, int fwd)
2621 struct MeshFlowControl *fc;
2623 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2624 if (GM_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
2630 * Sends an already built message on a connection, properly registering
2631 * all used resources.
2633 * @param message Message to send. Function makes a copy of it.
2634 * If message is not hop-by-hop, decrements TTL of copy.
2635 * @param c Connection on which this message is transmitted.
2636 * @param fwd Is this a fwd message?
2637 * @param force Force the connection to accept the message (buffer overfill).
2638 * @param cont Continuation called once message is sent. Can be NULL.
2639 * @param cont_cls Closure for @c cont.
2641 * @return Handle to cancel the message before it's sent.
2642 * NULL on error or if @c cont is NULL.
2643 * Invalid on @c cont call.
2645 struct MeshConnectionQueue *
2646 GMC_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
2647 struct MeshConnection *c, int fwd, int force,
2648 GMC_sent cont, void *cont_cls)
2650 struct MeshFlowControl *fc;
2651 struct MeshConnectionQueue *q;
2657 size = ntohs (message->size);
2658 data = GNUNET_malloc (size);
2659 memcpy (data, message, size);
2660 type = ntohs (message->type);
2661 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send %s (%u bytes) on connection %s\n",
2662 GM_m2s (type), size, GMC_2s (c));
2664 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2665 droppable = GNUNET_NO == force;
2668 struct GNUNET_MESH_Encrypted *emsg;
2669 struct GNUNET_MESH_KX *kmsg;
2670 struct GNUNET_MESH_ACK *amsg;
2671 struct GNUNET_MESH_Poll *pmsg;
2672 struct GNUNET_MESH_ConnectionDestroy *dmsg;
2673 struct GNUNET_MESH_ConnectionBroken *bmsg;
2676 case GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED:
2677 emsg = (struct GNUNET_MESH_Encrypted *) data;
2678 ttl = ntohl (emsg->ttl);
2681 GNUNET_break_op (0);
2686 emsg->ttl = htonl (ttl - 1);
2687 emsg->pid = htonl (fc->next_pid++);
2688 LOG (GNUNET_ERROR_TYPE_DEBUG, " Q_N+ %p %u\n", fc, fc->queue_n);
2689 if (GNUNET_YES == droppable)
2692 LOG (GNUNET_ERROR_TYPE_DEBUG, "pid %u\n", ntohl (emsg->pid));
2693 LOG (GNUNET_ERROR_TYPE_DEBUG, "last pid sent %u\n", fc->last_pid_sent);
2694 LOG (GNUNET_ERROR_TYPE_DEBUG, " ack recv %u\n", fc->last_ack_recv);
2698 LOG (GNUNET_ERROR_TYPE_DEBUG, " not droppable, Q_N stays the same\n");
2700 if (GM_is_pid_bigger (fc->last_pid_sent + 1, fc->last_ack_recv))
2702 GMC_start_poll (c, fwd);
2706 case GNUNET_MESSAGE_TYPE_MESH_KX:
2707 kmsg = (struct GNUNET_MESH_KX *) data;
2711 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2712 amsg = (struct GNUNET_MESH_ACK *) data;
2714 LOG (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", ntohl (amsg->ack));
2715 droppable = GNUNET_NO;
2718 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2719 pmsg = (struct GNUNET_MESH_Poll *) data;
2721 LOG (GNUNET_ERROR_TYPE_DEBUG, " poll %u\n", ntohl (pmsg->pid));
2722 droppable = GNUNET_NO;
2725 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY:
2726 dmsg = (struct GNUNET_MESH_ConnectionDestroy *) data;
2731 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN:
2732 bmsg = (struct GNUNET_MESH_ConnectionBroken *) data;
2737 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE:
2738 case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK:
2739 case GNUNET_MESSAGE_TYPE_MESH_KEEPALIVE:
2748 if (fc->queue_n > fc->queue_max && droppable)
2750 GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)",
2753 LOG (GNUNET_ERROR_TYPE_DEBUG,
2754 "queue full: %u/%u\n",
2755 fc->queue_n, fc->queue_max);
2756 if (GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED == type)
2762 return NULL; /* Drop this message */
2765 LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P+ %p %u\n", c, c->pending_messages);
2766 c->pending_messages++;
2768 q = GNUNET_new (struct MeshConnectionQueue);
2769 q->forced = !droppable;
2770 q->q = GMP_queue_add (get_hop (c, fwd), data, type, size, c, fwd,
2774 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING dropping msg on %s\n", GMC_2s (c));
2780 q->cont_cls = cont_cls;
2786 * Cancel a previously sent message while it's in the queue.
2788 * ONLY can be called before the continuation given to the send function
2789 * is called. Once the continuation is called, the message is no longer in the
2792 * @param q Handle to the queue.
2795 GMC_cancel (struct MeshConnectionQueue *q)
2797 LOG (GNUNET_ERROR_TYPE_DEBUG, "! GMC cancel message\n");
2799 /* queue destroy calls message_sent, which calls q->cont and frees q */
2800 GMP_queue_destroy (q->q, GNUNET_YES);
2805 * Sends a CREATE CONNECTION message for a path to a peer.
2806 * Changes the connection and tunnel states if necessary.
2808 * @param connection Connection to create.
2811 GMC_send_create (struct MeshConnection *connection)
2813 enum MeshTunnel3CState state;
2816 size = sizeof (struct GNUNET_MESH_ConnectionCreate);
2817 size += connection->path->length * sizeof (struct GNUNET_PeerIdentity);
2819 LOG (GNUNET_ERROR_TYPE_DEBUG, "Send connection create\n");
2820 LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P+ %p %u (create)\n",
2821 connection, connection->pending_messages);
2822 connection->pending_messages++;
2824 GMP_queue_add (get_next_hop (connection), NULL,
2825 GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE,
2826 size, connection, GNUNET_YES, &message_sent, NULL);
2828 state = GMT_get_cstate (connection->t);
2829 if (MESH_TUNNEL3_SEARCHING == state || MESH_TUNNEL3_NEW == state)
2830 GMT_change_cstate (connection->t, MESH_TUNNEL3_WAITING);
2831 if (MESH_CONNECTION_NEW == connection->state)
2832 connection_change_state (connection, MESH_CONNECTION_SENT);
2837 * Send a message to all peers in this connection that the connection
2838 * is no longer valid.
2840 * If some peer should not receive the message, it should be zero'ed out
2841 * before calling this function.
2843 * @param c The connection whose peers to notify.
2846 GMC_send_destroy (struct MeshConnection *c)
2848 struct GNUNET_MESH_ConnectionDestroy msg;
2850 if (GNUNET_YES == c->destroy)
2853 msg.header.size = htons (sizeof (msg));
2854 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY);;
2856 LOG (GNUNET_ERROR_TYPE_DEBUG,
2857 " sending connection destroy for connection %s\n",
2860 if (GNUNET_NO == GMC_is_terminal (c, GNUNET_YES))
2861 GMC_send_prebuilt_message (&msg.header, c,
2862 GNUNET_YES, GNUNET_YES, NULL, NULL);
2863 if (GNUNET_NO == GMC_is_terminal (c, GNUNET_NO))
2864 GMC_send_prebuilt_message (&msg.header, c,
2865 GNUNET_NO, GNUNET_YES, NULL, NULL);
2866 c->destroy = GNUNET_YES;
2867 c->state = MESH_CONNECTION_DESTROYED;
2872 * @brief Start a polling timer for the connection.
2874 * When a neighbor does not accept more traffic on the connection it could be
2875 * caused by a simple congestion or by a lost ACK. Polling enables to check
2876 * for the lastest ACK status for a connection.
2878 * @param c Connection.
2879 * @param fwd Should we poll in the FWD direction?
2882 GMC_start_poll (struct MeshConnection *c, int fwd)
2884 struct MeshFlowControl *fc;
2886 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2887 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL %s requested\n",
2889 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task || NULL != fc->poll_msg)
2891 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** not needed (%u, %p)\n",
2892 fc->poll_task, fc->poll_msg);
2895 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL started on request\n");
2896 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
2903 * @brief Stop polling a connection for ACKs.
2905 * Once we have enough ACKs for future traffic, polls are no longer necessary.
2907 * @param c Connection.
2908 * @param fwd Should we stop the poll in the FWD direction?
2911 GMC_stop_poll (struct MeshConnection *c, int fwd)
2913 struct MeshFlowControl *fc;
2915 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2916 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
2918 GNUNET_SCHEDULER_cancel (fc->poll_task);
2919 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2924 * Get a (static) string for a connection.
2926 * @param c Connection.
2929 GMC_2s (const struct MeshConnection *c)
2936 static char buf[128];
2938 sprintf (buf, "%s (->%s)", GNUNET_h2s (&c->id), GMT_2s (c->t));
2941 return GNUNET_h2s (&c->id);