2 This file is part of GNUnet.
3 Copyright (C) 2001-2015 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
21 * @file cadet/gnunet-service-cadet_connection.c
22 * @brief GNUnet CADET service connection handling
23 * @author Bartlomiej Polot
26 #include "gnunet_util_lib.h"
27 #include "gnunet_statistics_service.h"
28 #include "cadet_path.h"
29 #include "cadet_protocol.h"
31 #include "gnunet-service-cadet_connection.h"
32 #include "gnunet-service-cadet_peer.h"
33 #include "gnunet-service-cadet_tunnel.h"
36 #define LOG(level, ...) GNUNET_log_from (level,"cadet-con",__VA_ARGS__)
37 #define LOG2(level, ...) GNUNET_log_from_nocheck(level,"cadet-con",__VA_ARGS__)
40 #define CADET_MAX_POLL_TIME GNUNET_TIME_relative_multiply (\
41 GNUNET_TIME_UNIT_MINUTES,\
46 /******************************************************************************/
47 /******************************** STRUCTS **********************************/
48 /******************************************************************************/
51 * Struct to encapsulate all the Flow Control information to a peer to which
52 * we are directly connected (on a core level).
54 struct CadetFlowControl
57 * Connection this controls.
59 struct CadetConnection *c;
62 * How many messages are in the queue on this connection.
67 * How many messages do we accept in the queue.
69 unsigned int queue_max;
72 * ID of the last packet sent towards the peer.
74 uint32_t last_pid_sent;
77 * ID of the last packet received from the peer.
79 uint32_t last_pid_recv;
82 * Bitmap of past 32 messages received:
83 * - LSB being @c last_pid_recv.
84 * - MSB being @c last_pid_recv - 31 (mod UINTMAX).
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 struct GNUNET_SCHEDULER_Task *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 CadetConnectionQueue *poll_msg;
114 * Queued poll message, to cancel if not necessary anymore (got ACK).
116 struct CadetConnectionQueue *ack_msg;
120 * Keep a record of the last messages sent on this connection.
122 struct CadetConnectionPerformance
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 CadetConnection
152 * Tunnel this connection is part of.
154 struct CadetTunnel *t;
157 * Flow control information for traffic fwd.
159 struct CadetFlowControl fwd_fc;
162 * Flow control information for traffic bck.
164 struct CadetFlowControl bck_fc;
167 * Measure connection performance on the endpoint.
169 struct CadetConnectionPerformance *perf;
172 * ID of the connection.
174 struct GNUNET_CADET_Hash id;
177 * Path being used for the tunnel. At the origin of the connection
178 * it's a pointer to the destination's path pool, otherwise just a copy.
180 struct CadetPeerPath *path;
183 * Task to keep the used paths alive at the owner,
184 * time tunnel out on all the other peers.
186 struct GNUNET_SCHEDULER_Task *fwd_maintenance_task;
189 * Task to keep the used paths alive at the destination,
190 * time tunnel out on all the other peers.
192 struct GNUNET_SCHEDULER_Task *bck_maintenance_task;
195 * Queue handle for maintainance traffic. One handle for FWD and BCK since
196 * one peer never needs to maintain both directions (no loopback connections).
198 struct CadetPeerQueue *maintenance_q;
201 * Should equal #get_next_hop().
203 struct CadetPeer *next_peer;
206 * Should equal #get_prev_hop().
208 struct CadetPeer *prev_peer;
211 * State of the connection.
213 enum CadetConnectionState state;
216 * Position of the local peer in the path.
218 unsigned int own_pos;
221 * Pending message count.
223 unsigned int pending_messages;
227 * - if 0, connection in use.
228 * - if 1, destroy on last message.
229 * - if 2, connection is being destroyed don't re-enter.
234 * Counter to do exponential backoff when creating a connection (max 64).
236 unsigned short create_retry;
241 * Handle for messages queued but not yet sent.
243 struct CadetConnectionQueue
246 * Peer queue handle, to cancel if necessary.
248 struct CadetPeerQueue *q;
251 * Continuation to call once sent.
256 * Closure for @e cont.
261 * Was this a forced message? (Do not account for it)
266 /******************************************************************************/
267 /******************************* GLOBALS ***********************************/
268 /******************************************************************************/
271 * Global handle to the statistics service.
273 extern struct GNUNET_STATISTICS_Handle *stats;
276 * Local peer own ID (memory efficient handle).
278 extern GNUNET_PEER_Id myid;
281 * Local peer own ID (full value).
283 extern struct GNUNET_PeerIdentity my_full_id;
286 * Connections known, indexed by cid (CadetConnection).
288 static struct GNUNET_CONTAINER_MultiHashMap *connections;
291 * How many connections are we willing to maintain.
292 * Local connections are always allowed, even if there are more connections than max.
294 static unsigned long long max_connections;
297 * How many messages *in total* are we willing to queue, divide by number of
298 * connections to get connection queue size.
300 static unsigned long long max_msgs_queue;
303 * How often to send path keepalives. Paths timeout after 4 missed.
305 static struct GNUNET_TIME_Relative refresh_connection_time;
308 * How often to send path create / ACKs.
310 static struct GNUNET_TIME_Relative create_connection_time;
313 /******************************************************************************/
314 /******************************** STATIC ***********************************/
315 /******************************************************************************/
317 #if 0 // avoid compiler warning for unused static function
319 fc_debug (struct CadetFlowControl *fc)
321 LOG (GNUNET_ERROR_TYPE_DEBUG, " IN: %u/%u\n",
322 fc->last_pid_recv, fc->last_ack_sent);
323 LOG (GNUNET_ERROR_TYPE_DEBUG, " OUT: %u/%u\n",
324 fc->last_pid_sent, fc->last_ack_recv);
325 LOG (GNUNET_ERROR_TYPE_DEBUG, " QUEUE: %u/%u\n",
326 fc->queue_n, fc->queue_max);
330 connection_debug (struct CadetConnection *c)
334 LOG (GNUNET_ERROR_TYPE_INFO, "DEBUG NULL CONNECTION\n");
337 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connection %s:%X\n",
338 peer2s (c->t->peer), GCC_2s (c));
339 LOG (GNUNET_ERROR_TYPE_DEBUG, " state: %u, pending msgs: %u\n",
340 c->state, c->pending_messages);
341 LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD FC\n");
342 fc_debug (&c->fwd_fc);
343 LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK FC\n");
344 fc_debug (&c->bck_fc);
350 * Schedule next keepalive task, taking in consideration
351 * the connection state and number of retries.
353 * @param c Connection for which to schedule the next keepalive.
354 * @param fwd Direction for the next keepalive.
357 schedule_next_keepalive (struct CadetConnection *c, int fwd);
361 * Resets the connection timeout task, some other message has done the
363 * - For the first peer on the direction this means to send
364 * a keepalive or a path confirmation message (either create or ACK).
365 * - For all other peers, this means to destroy the connection,
366 * due to lack of activity.
367 * Starts the timeout if no timeout was running (connection just created).
369 * @param c Connection whose timeout to reset.
370 * @param fwd Is this forward?
373 connection_reset_timeout (struct CadetConnection *c, int fwd);
377 * Get string description for tunnel state. Reentrant.
379 * @param s Tunnel state.
381 * @return String representation.
384 GCC_state2s (enum CadetConnectionState s)
388 case CADET_CONNECTION_NEW:
389 return "CADET_CONNECTION_NEW";
390 case CADET_CONNECTION_SENT:
391 return "CADET_CONNECTION_SENT";
392 case CADET_CONNECTION_ACK:
393 return "CADET_CONNECTION_ACK";
394 case CADET_CONNECTION_READY:
395 return "CADET_CONNECTION_READY";
396 case CADET_CONNECTION_DESTROYED:
397 return "CADET_CONNECTION_DESTROYED";
398 case CADET_CONNECTION_BROKEN:
399 return "CADET_CONNECTION_BROKEN";
402 LOG (GNUNET_ERROR_TYPE_ERROR, " conn state %u unknown!\n", s);
403 return "CADET_CONNECTION_STATE_ERROR";
409 * Initialize a Flow Control structure to the initial state.
411 * @param fc Flow Control structure to initialize.
414 fc_init (struct CadetFlowControl *fc)
416 fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
417 fc->last_pid_recv = (uint32_t) -1;
418 fc->last_ack_sent = (uint32_t) 0;
419 fc->last_ack_recv = (uint32_t) 0;
420 fc->poll_task = NULL;
421 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
423 fc->queue_max = (max_msgs_queue / max_connections) + 1;
430 * @param cid Connection ID.
432 static struct CadetConnection *
433 connection_get (const struct GNUNET_CADET_Hash *cid)
435 return GNUNET_CONTAINER_multihashmap_get (connections, GC_h2hc (cid));
440 connection_change_state (struct CadetConnection* c,
441 enum CadetConnectionState state)
443 LOG (GNUNET_ERROR_TYPE_DEBUG,
444 "Connection %s state %s -> %s\n",
445 GCC_2s (c), GCC_state2s (c->state), GCC_state2s (state));
446 if (CADET_CONNECTION_DESTROYED <= c->state) /* Destroyed or broken. */
448 LOG (GNUNET_ERROR_TYPE_DEBUG, "state not changing anymore\n");
452 if (CADET_CONNECTION_READY == state)
458 * Callback called when a queued ACK message is sent.
460 * @param cls Closure (FC).
461 * @param c Connection this message was on.
462 * @param q Queue handler this call invalidates.
463 * @param type Type of message sent.
464 * @param fwd Was this a FWD going message?
465 * @param size Size of the message.
469 struct CadetConnection *c,
470 struct CadetConnectionQueue *q,
471 uint16_t type, int fwd, size_t size)
473 struct CadetFlowControl *fc = cls;
480 * Send an ACK on the connection, informing the predecessor about
481 * the available buffer space. Should not be called in case the peer
482 * is origin (no predecessor) in the @c fwd direction.
484 * Note that for fwd ack, the FWD mean forward *traffic* (root->dest),
485 * the ACK itself goes "back" (dest->root).
487 * @param c Connection on which to send the ACK.
488 * @param buffer How much space free to advertise?
489 * @param fwd Is this FWD ACK? (Going dest -> root)
490 * @param force Don't optimize out.
493 send_ack (struct CadetConnection *c, unsigned int buffer, int fwd, int force)
495 struct CadetFlowControl *next_fc;
496 struct CadetFlowControl *prev_fc;
497 struct GNUNET_CADET_ACK msg;
501 /* If origin, there is no connection to send ACKs. Wrong function! */
502 if (GCC_is_origin (c, fwd))
504 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection %s is origin in %s\n",
505 GCC_2s (c), GC_f2s (fwd));
510 next_fc = fwd ? &c->fwd_fc : &c->bck_fc;
511 prev_fc = fwd ? &c->bck_fc : &c->fwd_fc;
513 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection send %s ack on %s\n",
514 GC_f2s (fwd), GCC_2s (c));
516 /* Check if we need to transmit the ACK. */
517 delta = prev_fc->last_ack_sent - prev_fc->last_pid_recv;
518 if (3 < delta && buffer < delta && GNUNET_NO == force)
520 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer > 3\n");
521 LOG (GNUNET_ERROR_TYPE_DEBUG,
522 " last pid recv: %u, last ack sent: %u\n",
523 prev_fc->last_pid_recv, prev_fc->last_ack_sent);
527 /* Ok, ACK might be necessary, what PID to ACK? */
528 ack = prev_fc->last_pid_recv + buffer;
529 LOG (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
530 LOG (GNUNET_ERROR_TYPE_DEBUG,
531 " last pid %u, last ack %u, qmax %u, q %u\n",
532 prev_fc->last_pid_recv, prev_fc->last_ack_sent,
533 next_fc->queue_max, next_fc->queue_n);
534 if (ack == prev_fc->last_ack_sent && GNUNET_NO == force)
536 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
540 /* Check if message is already in queue */
541 if (NULL != prev_fc->ack_msg)
543 if (GC_is_pid_bigger (ack, prev_fc->last_ack_sent))
545 LOG (GNUNET_ERROR_TYPE_DEBUG, " canceling old ACK\n");
546 GCC_cancel (prev_fc->ack_msg);
547 /* GCC_cancel triggers ack_sent(), which clears fc->ack_msg */
551 LOG (GNUNET_ERROR_TYPE_DEBUG, " same ACK already in queue\n");
556 prev_fc->last_ack_sent = ack;
558 /* Build ACK message and send on connection */
559 msg.header.size = htons (sizeof (msg));
560 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_ACK);
561 msg.ack = htonl (ack);
564 prev_fc->ack_msg = GCC_send_prebuilt_message (&msg.header, 0, ack, c,
567 GNUNET_assert (NULL != prev_fc->ack_msg);
572 * Callback called when a connection queued message is sent.
574 * Calculates the average time and connection packet tracking.
576 * @param cls Closure (ConnectionQueue Handle).
577 * @param c Connection this message was on.
578 * @param sent Was it really sent? (Could have been canceled)
579 * @param type Type of message sent.
580 * @param pid Packet ID, or 0 if not applicable (create, destroy, etc).
581 * @param fwd Was this a FWD going message?
582 * @param size Size of the message.
583 * @param wait Time spent waiting for core (only the time for THIS message)
585 * @return #GNUNET_YES if connection was destroyed, #GNUNET_NO otherwise.
588 conn_message_sent (void *cls,
589 struct CadetConnection *c, int sent,
590 uint16_t type, uint32_t pid, int fwd, size_t size,
591 struct GNUNET_TIME_Relative wait)
593 struct CadetConnectionPerformance *p;
594 struct CadetFlowControl *fc;
595 struct CadetConnectionQueue *q = cls;
599 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection message_sent\n");
601 GCC_debug (c, GNUNET_ERROR_TYPE_DEBUG);
603 fc = fwd ? &c->fwd_fc : &c->bck_fc;
604 LOG (GNUNET_ERROR_TYPE_DEBUG, " %ssent %s %s pid %u\n",
605 sent ? "" : "not ", GC_f2s (fwd), GC_m2s (type), pid);
611 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling cont\n");
612 q->cont (q->cont_cls, c, q, type, fwd, size);
616 else if (type == GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED
617 || type == GNUNET_MESSAGE_TYPE_CADET_AX)
619 /* If NULL == q and ENCRYPTED == type, message must have been ch_mngmnt */
628 if (type != GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN
629 && type != GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY)
631 LOG (GNUNET_ERROR_TYPE_ERROR, "Message %s sent on NULL connection!\n",
636 LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P- %p %u\n", c, c->pending_messages);
637 c->pending_messages--;
638 if ( (GNUNET_YES == c->destroy) &&
639 (0 == c->pending_messages) )
641 LOG (GNUNET_ERROR_TYPE_DEBUG,
642 "! destroying connection!\n");
646 /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
649 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
650 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
651 c->maintenance_q = NULL;
652 /* Don't trigger a keepalive for sent ACKs, only SYN and SYNACKs */
653 if (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE == type || !fwd)
654 schedule_next_keepalive (c, fwd);
657 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
658 case GNUNET_MESSAGE_TYPE_CADET_AX:
659 if (GNUNET_YES == sent)
661 GNUNET_assert (NULL != q);
662 fc->last_pid_sent = pid;
663 if (GC_is_pid_bigger (fc->last_pid_sent + 1, fc->last_ack_recv))
664 GCC_start_poll (c, fwd);
665 GCC_send_ack (c, fwd, GNUNET_NO);
666 connection_reset_timeout (c, fwd);
669 LOG (GNUNET_ERROR_TYPE_DEBUG, "! Q_N- %p %u\n", fc, fc->queue_n);
670 if (GNUNET_NO == forced)
673 LOG (GNUNET_ERROR_TYPE_DEBUG,
674 "! accounting pid %u\n",
679 LOG (GNUNET_ERROR_TYPE_DEBUG,
680 "! forced, Q_N not accounting pid %u\n",
685 case GNUNET_MESSAGE_TYPE_CADET_KX:
686 if (GNUNET_YES == sent)
687 connection_reset_timeout (c, fwd);
690 case GNUNET_MESSAGE_TYPE_CADET_POLL:
694 case GNUNET_MESSAGE_TYPE_CADET_ACK:
698 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
702 LOG (GNUNET_ERROR_TYPE_ERROR, "%s unknown\n", GC_m2s (type));
706 LOG (GNUNET_ERROR_TYPE_DEBUG, "! message sent!\n");
709 return GNUNET_NO; /* Only endpoints are interested in timing. */
712 usecsperbyte = ((double) wait.rel_value_us) / size;
713 if (p->size == AVG_MSGS)
715 /* Array is full. Substract oldest value, add new one and store. */
716 p->avg -= (p->usecsperbyte[p->idx] / AVG_MSGS);
717 p->usecsperbyte[p->idx] = usecsperbyte;
718 p->avg += (p->usecsperbyte[p->idx] / AVG_MSGS);
722 /* Array not yet full. Add current value to avg and store. */
723 p->usecsperbyte[p->idx] = usecsperbyte;
725 p->avg += p->usecsperbyte[p->idx];
729 p->idx = (p->idx + 1) % AVG_MSGS;
735 * Get the previous hop in a connection
737 * @param c Connection.
739 * @return Previous peer in the connection.
741 static struct CadetPeer *
742 get_prev_hop (const struct CadetConnection *c)
748 LOG (GNUNET_ERROR_TYPE_DEBUG,
749 " get prev hop %s [%u/%u]\n",
750 GCC_2s (c), c->own_pos, c->path->length);
751 if (0 == c->own_pos || c->path->length < 2)
752 id = c->path->peers[0];
754 id = c->path->peers[c->own_pos - 1];
756 LOG (GNUNET_ERROR_TYPE_DEBUG, " ID: %s (%u)\n",
757 GNUNET_i2s (GNUNET_PEER_resolve2 (id)), id);
759 return GCP_get_short (id);
764 * Get the next hop in a connection
766 * @param c Connection.
768 * @return Next peer in the connection.
770 static struct CadetPeer *
771 get_next_hop (const struct CadetConnection *c)
778 LOG (GNUNET_ERROR_TYPE_DEBUG, " get next hop %s [%u/%u]\n",
779 GCC_2s (c), c->own_pos, c->path->length);
780 if ((c->path->length - 1) == c->own_pos || c->path->length < 2)
781 id = c->path->peers[c->path->length - 1];
783 id = c->path->peers[c->own_pos + 1];
785 LOG (GNUNET_ERROR_TYPE_DEBUG, " ID: %s (%u)\n",
786 GNUNET_i2s (GNUNET_PEER_resolve2 (id)), id);
788 return GCP_get_short (id);
793 * Get the hop in a connection.
795 * @param c Connection.
796 * @param fwd Next in the FWD direction?
798 * @return Next peer in the connection.
800 static struct CadetPeer *
801 get_hop (struct CadetConnection *c, int fwd)
804 return get_next_hop (c);
805 return get_prev_hop (c);
810 * Get a bit mask for a message received out-of-order.
812 * @param last_pid_recv Last PID we received prior to the out-of-order.
813 * @param ooo_pid PID of the out-of-order message.
816 get_recv_bitmask (uint32_t last_pid_recv, uint32_t ooo_pid)
818 return 1 << (last_pid_recv - ooo_pid);
823 * Check is an out-of-order message is ok:
824 * - at most 31 messages behind.
827 * @param last_pid_recv Last in-order PID received.
830 is_ooo_ok (uint32_t last_pid_recv, uint32_t ooo_pid, uint32_t ooo_bitmap)
834 if (GC_is_pid_bigger (last_pid_recv - 31, ooo_pid))
837 mask = get_recv_bitmask (last_pid_recv, ooo_pid);
838 if (0 != (ooo_bitmap & mask))
846 * Is traffic coming from this sender 'FWD' traffic?
848 * @param c Connection to check.
849 * @param sender Peer identity of neighbor.
851 * @return #GNUNET_YES in case the sender is the 'prev' hop and therefore
852 * the traffic is 'FWD'.
853 * #GNUNET_NO for BCK.
854 * #GNUNET_SYSERR for errors.
857 is_fwd (const struct CadetConnection *c,
858 const struct GNUNET_PeerIdentity *sender)
862 id = GNUNET_PEER_search (sender);
863 if (GCP_get_short_id (get_prev_hop (c)) == id)
866 if (GCP_get_short_id (get_next_hop (c)) == id)
870 return GNUNET_SYSERR;
875 * Sends a CONNECTION ACK message in reponse to a received CONNECTION_CREATE
876 * or a first CONNECTION_ACK directed to us.
878 * @param connection Connection to confirm.
879 * @param fwd Should we send it FWD? (root->dest)
880 * (First (~SYNACK) goes BCK, second (~ACK) goes FWD)
883 send_connection_ack (struct CadetConnection *connection, int fwd)
885 struct CadetTunnel *t;
888 LOG (GNUNET_ERROR_TYPE_INFO, "---> {%14s ACK} on connection %s\n",
889 GC_f2s (!fwd), GCC_2s (connection));
890 GCP_queue_add (get_hop (connection, fwd), NULL,
891 GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK, 0, 0,
892 sizeof (struct GNUNET_CADET_ConnectionACK),
893 connection, fwd, &conn_message_sent, NULL);
894 connection->pending_messages++;
895 if (CADET_TUNNEL_NEW == GCT_get_cstate (t))
896 GCT_change_cstate (t, CADET_TUNNEL_WAITING);
897 if (CADET_CONNECTION_READY != connection->state)
898 connection_change_state (connection, CADET_CONNECTION_SENT);
903 * Send a notification that a connection is broken.
905 * @param c Connection that is broken.
906 * @param id1 Peer that has disconnected.
907 * @param id2 Peer that has disconnected.
908 * @param fwd Direction towards which to send it.
911 send_broken (struct CadetConnection *c,
912 const struct GNUNET_PeerIdentity *id1,
913 const struct GNUNET_PeerIdentity *id2,
916 struct GNUNET_CADET_ConnectionBroken msg;
918 msg.header.size = htons (sizeof (struct GNUNET_CADET_ConnectionBroken));
919 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN);
923 GNUNET_assert (NULL == GCC_send_prebuilt_message (&msg.header, 0, 0, c, fwd,
924 GNUNET_YES, NULL, NULL));
929 * Send a notification that a connection is broken, when a connection
930 * isn't even known to the local peer or soon to be destroyed.
932 * @param connection_id Connection ID.
933 * @param id1 Peer that has disconnected, probably local peer.
934 * @param id2 Peer that has disconnected can be NULL if unknown.
935 * @param peer Peer to notify (neighbor who sent the connection).
938 send_broken_unknown (const struct GNUNET_CADET_Hash *connection_id,
939 const struct GNUNET_PeerIdentity *id1,
940 const struct GNUNET_PeerIdentity *id2,
941 const struct GNUNET_PeerIdentity *peer_id)
943 struct GNUNET_CADET_ConnectionBroken *msg;
944 struct CadetPeer *neighbor;
946 LOG (GNUNET_ERROR_TYPE_INFO, "---> BROKEN on unknown connection %s\n",
947 GNUNET_h2s (GC_h2hc (connection_id)));
949 msg = GNUNET_new (struct GNUNET_CADET_ConnectionBroken);
950 msg->header.size = htons (sizeof (struct GNUNET_CADET_ConnectionBroken));
951 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN);
952 msg->cid = *connection_id;
957 memset (&msg->peer2, 0, sizeof (msg->peer2));
958 neighbor = GCP_get (peer_id);
959 GCP_queue_add (neighbor, msg, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN,
960 0, 2, sizeof (struct GNUNET_CADET_ConnectionBroken),
961 NULL, GNUNET_SYSERR, /* connection, fwd */
962 NULL, NULL); /* continuation */
967 * Send keepalive packets for a connection.
969 * @param c Connection to keep alive..
970 * @param fwd Is this a FWD keepalive? (owner -> dest).
973 send_connection_keepalive (struct CadetConnection *c, int fwd)
975 struct GNUNET_MessageHeader msg;
976 struct CadetFlowControl *fc;
978 LOG (GNUNET_ERROR_TYPE_INFO, "keepalive %s for connection %s\n",
979 GC_f2s (fwd), GCC_2s (c));
981 fc = fwd ? &c->fwd_fc : &c->bck_fc;
984 LOG (GNUNET_ERROR_TYPE_INFO, "not sending keepalive, traffic in queue\n");
988 GNUNET_STATISTICS_update (stats, "# keepalives sent", 1, GNUNET_NO);
990 GNUNET_assert (NULL != c->t);
991 msg.size = htons (sizeof (msg));
992 msg.type = htons (GNUNET_MESSAGE_TYPE_CADET_KEEPALIVE);
994 GNUNET_assert (NULL ==
995 GCT_send_prebuilt_message (&msg, c->t, c,
996 GNUNET_NO, NULL, NULL));
1001 * Send CONNECTION_{CREATE/ACK} packets for a connection.
1003 * @param c Connection for which to send the message.
1004 * @param fwd If #GNUNET_YES, send CREATE, otherwise send ACK.
1007 connection_recreate (struct CadetConnection *c, int fwd)
1009 LOG (GNUNET_ERROR_TYPE_DEBUG, "sending connection recreate\n");
1011 GCC_send_create (c);
1013 send_connection_ack (c, GNUNET_NO);
1018 * Generic connection timer management.
1019 * Depending on the role of the peer in the connection will send the
1020 * appropriate message (build or keepalive)
1022 * @param c Conncetion to maintain.
1023 * @param fwd Is FWD?
1026 connection_maintain (struct CadetConnection *c, int fwd)
1028 if (GNUNET_NO != c->destroy)
1030 LOG (GNUNET_ERROR_TYPE_INFO, "not sending keepalive, being destroyed\n");
1037 GCC_debug (c, GNUNET_ERROR_TYPE_ERROR);
1041 if (CADET_TUNNEL_SEARCHING == GCT_get_cstate (c->t))
1043 /* If status is SEARCHING, why is there a connection? Should be WAITING */
1045 GCT_debug (c->t, GNUNET_ERROR_TYPE_ERROR);
1046 LOG (GNUNET_ERROR_TYPE_INFO, "not sending keepalive, tunnel SEARCHING\n");
1047 schedule_next_keepalive (c, fwd);
1052 case CADET_CONNECTION_NEW:
1055 case CADET_CONNECTION_SENT:
1056 connection_recreate (c, fwd);
1058 case CADET_CONNECTION_READY:
1059 send_connection_keepalive (c, fwd);
1069 * Keep the connection alive.
1071 * @param c Connection to keep alive.
1072 * @param fwd Direction.
1073 * @param shutdown Are we shutting down? (Don't send traffic)
1074 * Non-zero value for true, not necessarily GNUNET_YES.
1077 connection_keepalive (struct CadetConnection *c, int fwd, int shutdown)
1079 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s keepalive for %s\n",
1080 GC_f2s (fwd), GCC_2s (c));
1083 c->fwd_maintenance_task = NULL;
1085 c->bck_maintenance_task = NULL;
1087 if (GNUNET_NO != shutdown)
1090 connection_maintain (c, fwd);
1092 /* Next execution will be scheduled by message_sent or _maintain*/
1097 * Keep the connection alive in the FWD direction.
1099 * @param cls Closure (connection to keepalive).
1100 * @param tc TaskContext.
1103 connection_fwd_keepalive (void *cls,
1104 const struct GNUNET_SCHEDULER_TaskContext *tc)
1106 connection_keepalive ((struct CadetConnection *) cls,
1108 tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN);
1113 * Keep the connection alive in the BCK direction.
1115 * @param cls Closure (connection to keepalive).
1116 * @param tc TaskContext.
1119 connection_bck_keepalive (void *cls,
1120 const struct GNUNET_SCHEDULER_TaskContext *tc)
1122 connection_keepalive ((struct CadetConnection *) cls,
1124 tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN);
1129 * Schedule next keepalive task, taking in consideration
1130 * the connection state and number of retries.
1132 * If the peer is not the origin, do nothing.
1134 * @param c Connection for which to schedule the next keepalive.
1135 * @param fwd Direction for the next keepalive.
1138 schedule_next_keepalive (struct CadetConnection *c, int fwd)
1140 struct GNUNET_TIME_Relative delay;
1141 struct GNUNET_SCHEDULER_Task * *task_id;
1142 GNUNET_SCHEDULER_TaskCallback keepalive_task;
1144 if (GNUNET_NO == GCC_is_origin (c, fwd))
1147 /* Calculate delay to use, depending on the state of the connection */
1148 if (CADET_CONNECTION_READY == c->state)
1150 delay = refresh_connection_time;
1154 if (1 > c->create_retry)
1155 c->create_retry = 1;
1156 delay = GNUNET_TIME_relative_multiply (create_connection_time,
1158 if (c->create_retry < 64)
1159 c->create_retry *= 2;
1162 /* Select direction-dependent parameters */
1163 if (GNUNET_YES == fwd)
1165 task_id = &c->fwd_maintenance_task;
1166 keepalive_task = &connection_fwd_keepalive;
1170 task_id = &c->bck_maintenance_task;
1171 keepalive_task = &connection_bck_keepalive;
1174 /* Check that no one scheduled it before us */
1175 if (NULL != *task_id)
1177 /* No need for a _break. It can happen for instance when sending a SYNACK
1178 * for a duplicate SYN: the first SYNACK scheduled the task. */
1179 GNUNET_SCHEDULER_cancel (*task_id);
1182 /* Schedule the task */
1183 *task_id = GNUNET_SCHEDULER_add_delayed (delay, keepalive_task, c);
1184 LOG (GNUNET_ERROR_TYPE_DEBUG, "next keepalive in %s\n",
1185 GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES));
1190 * @brief Re-initiate traffic on this connection if necessary.
1192 * Check if there is traffic queued towards this peer
1193 * and the core transmit handle is NULL (traffic was stalled).
1194 * If so, call core tmt rdy.
1196 * @param c Connection on which initiate traffic.
1197 * @param fwd Is this about fwd traffic?
1200 connection_unlock_queue (struct CadetConnection *c, int fwd)
1202 struct CadetPeer *peer;
1204 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection_unlock_queue %s on %s\n",
1205 GC_f2s (fwd), GCC_2s (c));
1207 if (GCC_is_terminal (c, fwd))
1209 LOG (GNUNET_ERROR_TYPE_DEBUG, " is terminal, can unlock!\n");
1213 peer = get_hop (c, fwd);
1214 GCP_queue_unlock (peer, c);
1219 * Cancel all transmissions that belong to a certain connection.
1221 * If the connection is scheduled for destruction and no more messages are left,
1222 * the connection will be destroyed by the continuation call.
1224 * @param c Connection which to cancel. Might be destroyed during this call.
1225 * @param fwd Cancel fwd traffic?
1228 connection_cancel_queues (struct CadetConnection *c, int fwd)
1230 struct CadetFlowControl *fc;
1231 struct CadetPeer *peer;
1233 LOG (GNUNET_ERROR_TYPE_DEBUG, "Cancel %s queues for connection %s\n",
1234 GC_f2s (fwd), GCC_2s (c));
1241 fc = fwd ? &c->fwd_fc : &c->bck_fc;
1242 if (NULL != fc->poll_task)
1244 GNUNET_SCHEDULER_cancel (fc->poll_task);
1245 fc->poll_task = NULL;
1246 LOG (GNUNET_ERROR_TYPE_DEBUG, "Cancel POLL in ccq for fc %p\n", fc);
1248 peer = get_hop (c, fwd);
1249 GCP_queue_cancel (peer, c);
1254 * Function called if a connection has been stalled for a while,
1255 * possibly due to a missed ACK. Poll the neighbor about its ACK status.
1257 * @param cls Closure (poll ctx).
1258 * @param tc TaskContext.
1261 connection_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
1265 * Callback called when a queued POLL message is sent.
1267 * @param cls Closure (FC).
1268 * @param c Connection this message was on.
1269 * @param q Queue handler this call invalidates.
1270 * @param type Type of message sent.
1271 * @param fwd Was this a FWD going message?
1272 * @param size Size of the message.
1275 poll_sent (void *cls,
1276 struct CadetConnection *c,
1277 struct CadetConnectionQueue *q,
1278 uint16_t type, int fwd, size_t size)
1280 struct CadetFlowControl *fc = cls;
1282 if (2 == c->destroy)
1284 LOG (GNUNET_ERROR_TYPE_DEBUG, "POLL canceled on shutdown\n");
1287 LOG (GNUNET_ERROR_TYPE_DEBUG, "POLL sent for %s, scheduling new one!\n",
1289 fc->poll_msg = NULL;
1290 fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
1291 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
1292 &connection_poll, fc);
1293 LOG (GNUNET_ERROR_TYPE_DEBUG, " task %u\n", fc->poll_task);
1298 * Function called if a connection has been stalled for a while,
1299 * possibly due to a missed ACK. Poll the neighbor about its ACK status.
1301 * @param cls Closure (poll ctx).
1302 * @param tc TaskContext.
1305 connection_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1307 struct CadetFlowControl *fc = cls;
1308 struct GNUNET_CADET_Poll msg;
1309 struct CadetConnection *c;
1312 fc->poll_task = NULL;
1313 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1319 fwd = fc == &c->fwd_fc;
1320 LOG (GNUNET_ERROR_TYPE_DEBUG, "Polling connection %s %s\n",
1321 GCC_2s (c), GC_f2s (fwd));
1323 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_POLL);
1324 msg.header.size = htons (sizeof (msg));
1325 msg.pid = htonl (fc->last_pid_sent);
1326 LOG (GNUNET_ERROR_TYPE_DEBUG, " last pid sent: %u\n", fc->last_pid_sent);
1328 GCC_send_prebuilt_message (&msg.header, 0, fc->last_pid_sent, c,
1329 fc == &c->fwd_fc, GNUNET_YES, &poll_sent, fc);
1330 GNUNET_assert (NULL != fc->poll_msg);
1335 * Resend all queued messages for a connection on other connections of the
1336 * same tunnel, if possible. The connection WILL BE DESTROYED by this function.
1338 * @param c Connection whose messages to resend.
1339 * @param fwd Resend fwd messages?
1342 resend_messages_and_destroy (struct CadetConnection *c, int fwd)
1344 struct GNUNET_MessageHeader *out_msg;
1345 struct CadetTunnel *t = c->t;
1346 struct CadetPeer *neighbor;
1347 unsigned int pending;
1350 c->state = CADET_CONNECTION_DESTROYED;
1351 c->destroy = GNUNET_YES;
1353 destroyed = GNUNET_NO;
1354 neighbor = get_hop (c, fwd);
1355 pending = c->pending_messages;
1357 while (NULL != (out_msg = GCP_connection_pop (neighbor, c, &destroyed)))
1360 GCT_resend_message (out_msg, t);
1361 GNUNET_free (out_msg);
1364 /* All pending messages should have been popped,
1365 * and the connection destroyed by the continuation.
1367 if (GNUNET_YES != destroyed)
1372 GCC_debug (c, GNUNET_ERROR_TYPE_ERROR);
1373 if (NULL != t) GCT_debug (t, GNUNET_ERROR_TYPE_ERROR);
1381 * Generic connection timeout implementation.
1383 * Timeout function due to lack of keepalive/traffic from an endpoint.
1384 * Destroys connection if called.
1386 * @param c Connection to destroy.
1387 * @param fwd Was the timeout from the origin? (FWD timeout)
1390 connection_timeout (struct CadetConnection *c, int fwd)
1392 struct CadetFlowControl *reverse_fc;
1394 reverse_fc = fwd ? &c->bck_fc : &c->fwd_fc;
1396 LOG (GNUNET_ERROR_TYPE_INFO,
1397 "Connection %s %s timed out. Destroying.\n",
1400 GCC_debug (c, GNUNET_ERROR_TYPE_DEBUG);
1402 if (GCC_is_origin (c, fwd)) /* Loopback? Something is wrong! */
1408 /* If dest, salvage queued traffic. */
1409 if (GCC_is_origin (c, !fwd))
1411 const struct GNUNET_PeerIdentity *next_hop;
1413 next_hop = GCP_get_id (fwd ? get_prev_hop (c) : get_next_hop (c));
1414 send_broken_unknown (&c->id, &my_full_id, NULL, next_hop);
1415 if (0 < reverse_fc->queue_n)
1416 resend_messages_and_destroy (c, !fwd);
1425 * Timeout function due to lack of keepalive/traffic from the owner.
1426 * Destroys connection if called.
1428 * @param cls Closure (connection to destroy).
1429 * @param tc TaskContext.
1432 connection_fwd_timeout (void *cls,
1433 const struct GNUNET_SCHEDULER_TaskContext *tc)
1435 struct CadetConnection *c = cls;
1437 c->fwd_maintenance_task = NULL;
1438 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1441 connection_timeout (c, GNUNET_YES);
1446 * Timeout function due to lack of keepalive/traffic from the destination.
1447 * Destroys connection if called.
1449 * @param cls Closure (connection to destroy).
1450 * @param tc TaskContext
1453 connection_bck_timeout (void *cls,
1454 const struct GNUNET_SCHEDULER_TaskContext *tc)
1456 struct CadetConnection *c = cls;
1458 c->bck_maintenance_task = NULL;
1459 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1462 connection_timeout (c, GNUNET_NO);
1467 * Resets the connection timeout task, some other message has done the
1469 * - For the first peer on the direction this means to send
1470 * a keepalive or a path confirmation message (either create or ACK).
1471 * - For all other peers, this means to destroy the connection,
1472 * due to lack of activity.
1473 * Starts the timeout if no timeout was running (connection just created).
1475 * @param c Connection whose timeout to reset.
1476 * @param fwd Is this forward?
1478 * TODO use heap to improve efficiency of scheduler.
1481 connection_reset_timeout (struct CadetConnection *c, int fwd)
1483 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connection %s reset timeout\n", GC_f2s (fwd));
1485 if (GCC_is_origin (c, fwd)) /* Startpoint */
1487 schedule_next_keepalive (c, fwd);
1489 else /* Relay, endpoint. */
1491 struct GNUNET_TIME_Relative delay;
1492 struct GNUNET_SCHEDULER_Task * *ti;
1493 GNUNET_SCHEDULER_TaskCallback f;
1495 ti = fwd ? &c->fwd_maintenance_task : &c->bck_maintenance_task;
1498 GNUNET_SCHEDULER_cancel (*ti);
1499 delay = GNUNET_TIME_relative_multiply (refresh_connection_time, 4);
1500 LOG (GNUNET_ERROR_TYPE_DEBUG, " timing out in %s\n",
1501 GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_NO));
1502 f = fwd ? &connection_fwd_timeout : &connection_bck_timeout;
1503 *ti = GNUNET_SCHEDULER_add_delayed (delay, f, c);
1509 * Add the connection to the list of both neighbors.
1511 * @param c Connection.
1513 * @return #GNUNET_OK if everything went fine
1514 * #GNUNET_SYSERR if the was an error and @c c is malformed.
1517 register_neighbors (struct CadetConnection *c)
1519 c->next_peer = get_next_hop (c);
1520 c->prev_peer = get_prev_hop (c);
1521 GNUNET_assert (c->next_peer != c->prev_peer);
1522 LOG (GNUNET_ERROR_TYPE_DEBUG,
1523 "register neighbors for connection %s\n",
1525 path_debug (c->path);
1526 LOG (GNUNET_ERROR_TYPE_DEBUG,
1527 "own pos %u\n", c->own_pos);
1528 LOG (GNUNET_ERROR_TYPE_DEBUG,
1529 "putting connection %s to next peer %p\n",
1532 LOG (GNUNET_ERROR_TYPE_DEBUG, "next peer %p %s\n",
1534 GCP_2s (c->next_peer));
1535 LOG (GNUNET_ERROR_TYPE_DEBUG,
1536 "putting connection %s to prev peer %p\n",
1539 LOG (GNUNET_ERROR_TYPE_DEBUG,
1540 "prev peer %p %s\n",
1542 GCP_2s (c->prev_peer));
1544 if ( (GNUNET_NO == GCP_is_neighbor (c->next_peer)) ||
1545 (GNUNET_NO == GCP_is_neighbor (c->prev_peer)) )
1547 if (GCC_is_origin (c, GNUNET_YES))
1548 GNUNET_STATISTICS_update (stats, "# local bad paths", 1, GNUNET_NO);
1549 GNUNET_STATISTICS_update (stats, "# bad paths", 1, GNUNET_NO);
1551 LOG (GNUNET_ERROR_TYPE_DEBUG,
1552 " register neighbors failed\n");
1553 LOG (GNUNET_ERROR_TYPE_DEBUG,
1554 " prev: %s, neighbor?: %d\n",
1555 GCP_2s (c->prev_peer),
1556 GCP_is_neighbor (c->prev_peer));
1557 LOG (GNUNET_ERROR_TYPE_DEBUG,
1558 " next: %s, neighbor?: %d\n",
1559 GCP_2s (c->next_peer),
1560 GCP_is_neighbor (c->next_peer));
1561 return GNUNET_SYSERR;
1563 GCP_add_connection (c->next_peer, c, GNUNET_NO);
1564 GCP_add_connection (c->prev_peer, c, GNUNET_YES);
1571 * Remove the connection from the list of both neighbors.
1573 * @param c Connection.
1576 unregister_neighbors (struct CadetConnection *c)
1578 struct CadetPeer *peer;
1580 /* Either already unregistered or never got registered, it's ok either way. */
1581 if (NULL == c->path)
1584 peer = get_next_hop (c);
1585 GNUNET_assert (c->next_peer == peer);
1586 GCP_remove_connection (peer, c);
1587 peer = get_prev_hop (c);
1588 GNUNET_assert (c->prev_peer == peer);
1589 GCP_remove_connection (peer, c);
1594 * Bind the connection to the peer and the tunnel to that peer.
1596 * If the peer has no tunnel, create one. Update tunnel and connection
1597 * data structres to reflect new status.
1599 * @param c Connection.
1603 add_to_peer (struct CadetConnection *c,
1604 struct CadetPeer *peer)
1606 GCP_add_tunnel (peer);
1607 c->t = GCP_get_tunnel (peer);
1608 GCT_add_connection (c->t, c);
1614 * Iterator to compare each connection's path with the path of a new connection.
1616 * If the connection conincides, the c member of path is set to the connection
1617 * and the destroy flag of the connection is set.
1619 * @param cls Closure (new path).
1620 * @param c Connection in the tunnel to check.
1623 check_path (void *cls, struct CadetConnection *c)
1625 struct CadetConnection *new_conn = cls;
1626 struct CadetPeerPath *path = new_conn->path;
1628 LOG (GNUNET_ERROR_TYPE_DEBUG, " checking %s (%p), length %u\n",
1629 GCC_2s (c), c, c->path->length);
1632 && c->destroy == GNUNET_NO
1633 && c->state != CADET_CONNECTION_BROKEN
1634 && c->state != CADET_CONNECTION_DESTROYED
1635 && path_equivalent (path, c->path))
1637 new_conn->destroy = GNUNET_YES;
1638 new_conn->path->c = c;
1639 LOG (GNUNET_ERROR_TYPE_DEBUG, " MATCH!\n");
1644 * Finds out if this path is already being used by and existing connection.
1646 * Checks the tunnel towards the first peer in the path to see if it contains
1647 * any connection with the same path.
1649 * If the existing connection is ready, it is kept.
1650 * Otherwise if the sender has a smaller ID that ours, we accept it (and
1651 * the peer will eventually reject our attempt).
1653 * @param path Path to check.
1655 * @return GNUNET_YES if the tunnel has a connection with the same path,
1656 * GNUNET_NO otherwise.
1659 does_connection_exist (struct CadetConnection *conn)
1661 struct CadetPeer *p;
1662 struct CadetTunnel *t;
1663 struct CadetConnection *c;
1665 p = GCP_get_short (conn->path->peers[0]);
1666 t = GCP_get_tunnel (p);
1670 LOG (GNUNET_ERROR_TYPE_DEBUG,
1671 "Checking for duplicates\n");
1673 GCT_iterate_connections (t, &check_path, conn);
1675 if (GNUNET_YES == conn->destroy)
1678 conn->destroy = GNUNET_NO;
1679 conn->path->c = conn;
1680 LOG (GNUNET_ERROR_TYPE_DEBUG, " found duplicate of %s\n", GCC_2s (conn));
1681 LOG (GNUNET_ERROR_TYPE_DEBUG, " duplicate: %s\n", GCC_2s (c));
1682 GCC_debug (c, GNUNET_ERROR_TYPE_DEBUG);
1683 if (CADET_CONNECTION_READY == c->state)
1685 /* The other peer confirmed a live connection with this path,
1686 * why is it trying to duplicate it. */
1690 if (GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, GCP_get_id (p)) > 0)
1692 struct CadetPeer *neighbor;
1694 LOG (GNUNET_ERROR_TYPE_DEBUG, " duplicate allowed (killing old)\n");
1695 if (GCC_is_origin (c, GNUNET_YES))
1696 neighbor = get_next_hop (c);
1698 neighbor = get_prev_hop (c);
1699 send_broken_unknown (&c->id, &my_full_id, NULL,
1700 GCP_get_id (neighbor));
1709 LOG (GNUNET_ERROR_TYPE_DEBUG, " %s has no duplicates\n", GCC_2s (conn));
1716 * Log receipt of message on stderr (INFO level).
1718 * @param message Message received.
1719 * @param peer Peer who sent the message.
1720 * @param hash Connection ID.
1723 log_message (const struct GNUNET_MessageHeader *message,
1724 const struct GNUNET_PeerIdentity *peer,
1725 const struct GNUNET_CADET_Hash *hash)
1729 size = ntohs (message->size);
1730 LOG (GNUNET_ERROR_TYPE_INFO, "\n");
1731 LOG (GNUNET_ERROR_TYPE_INFO, "\n");
1732 LOG (GNUNET_ERROR_TYPE_INFO, "<-- %s on connection %s from %s, %6u bytes\n",
1733 GC_m2s (ntohs (message->type)), GNUNET_h2s (GC_h2hc (hash)),
1734 GNUNET_i2s (peer), (unsigned int) size);
1737 /******************************************************************************/
1738 /******************************** API ***********************************/
1739 /******************************************************************************/
1742 * Core handler for connection creation.
1744 * @param cls Closure (unused).
1745 * @param peer Sender (neighbor).
1746 * @param message Message.
1748 * @return GNUNET_OK to keep the connection open,
1749 * GNUNET_SYSERR to close it (signal serious error)
1752 GCC_handle_create (void *cls, const struct GNUNET_PeerIdentity *peer,
1753 const struct GNUNET_MessageHeader *message)
1755 struct GNUNET_CADET_ConnectionCreate *msg;
1756 struct GNUNET_PeerIdentity *id;
1757 struct GNUNET_CADET_Hash *cid;
1758 struct CadetPeerPath *path;
1759 struct CadetPeer *dest_peer;
1760 struct CadetPeer *orig_peer;
1761 struct CadetConnection *c;
1762 unsigned int own_pos;
1766 size = ntohs (message->size);
1767 if (size < sizeof (struct GNUNET_CADET_ConnectionCreate))
1769 GNUNET_break_op (0);
1773 /* Calculate hops */
1774 size -= sizeof (struct GNUNET_CADET_ConnectionCreate);
1775 if (size % sizeof (struct GNUNET_PeerIdentity))
1777 GNUNET_break_op (0);
1780 if (0 != size % sizeof (struct GNUNET_PeerIdentity))
1782 GNUNET_break_op (0);
1785 size /= sizeof (struct GNUNET_PeerIdentity);
1788 GNUNET_break_op (0);
1791 LOG (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
1793 /* Get parameters */
1794 msg = (struct GNUNET_CADET_ConnectionCreate *) message;
1796 log_message (message, peer, cid);
1797 id = (struct GNUNET_PeerIdentity *) &msg[1];
1798 LOG (GNUNET_ERROR_TYPE_DEBUG, " origin: %s\n", GNUNET_i2s (id));
1800 /* Create connection */
1801 c = connection_get (cid);
1804 path = path_build_from_peer_ids ((struct GNUNET_PeerIdentity *) &msg[1],
1805 size, myid, &own_pos);
1808 /* Path was malformed, probably our own ID was not in it. */
1809 GNUNET_STATISTICS_update (stats, "# malformed paths", 1, GNUNET_NO);
1810 GNUNET_break_op (0);
1816 /* We received this request from a neighbor, we cannot be origin */
1817 GNUNET_STATISTICS_update (stats, "# fake paths", 1, GNUNET_NO);
1818 GNUNET_break_op (0);
1819 path_destroy (path);
1823 LOG (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
1824 LOG (GNUNET_ERROR_TYPE_DEBUG, " Creating connection\n");
1825 c = GCC_new (cid, NULL, path, own_pos);
1828 if (path->length - 1 == own_pos)
1830 /* If we are destination, why did the creation fail? */
1832 path_destroy (path);
1835 send_broken_unknown (cid, &my_full_id,
1836 GNUNET_PEER_resolve2 (path->peers[own_pos + 1]),
1838 path_destroy (path);
1841 GCP_add_path_to_all (path, GNUNET_NO);
1842 connection_reset_timeout (c, GNUNET_YES);
1846 path = path_duplicate (c->path);
1848 if (CADET_CONNECTION_NEW == c->state)
1849 connection_change_state (c, CADET_CONNECTION_SENT);
1851 /* Remember peers */
1852 dest_peer = GCP_get (&id[size - 1]);
1853 orig_peer = GCP_get (&id[0]);
1855 /* Is it a connection to us? */
1856 if (c->own_pos == path->length - 1)
1858 LOG (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
1859 GCP_add_path_to_origin (orig_peer, path_duplicate (path), GNUNET_YES);
1861 add_to_peer (c, orig_peer);
1862 if (GNUNET_YES == does_connection_exist (c))
1864 // FIXME Peer created a connection equal to one we think exists
1865 // and is fine. What should we do?
1866 // Use explicit duplicate?
1867 // Accept new conn and destroy the old? (interruption in higher level)
1868 // Keep both and postpone disambiguation?
1869 // Keep the one created by peer with higher ID?
1870 // For now: reject new connection until current confirmed dead
1871 GNUNET_break_op (0);
1872 GCC_debug (c, GNUNET_ERROR_TYPE_WARNING);
1873 path_destroy (path);
1875 send_broken_unknown (cid, &my_full_id, NULL, peer);
1880 if (CADET_TUNNEL_NEW == GCT_get_cstate (c->t))
1881 GCT_change_cstate (c->t, CADET_TUNNEL_WAITING);
1883 send_connection_ack (c, GNUNET_NO);
1884 if (CADET_CONNECTION_SENT == c->state)
1885 connection_change_state (c, CADET_CONNECTION_ACK);
1889 /* It's for somebody else! Retransmit. */
1890 LOG (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
1891 GCP_add_path (dest_peer, path_duplicate (path), GNUNET_NO);
1892 GCP_add_path_to_origin (orig_peer, path_duplicate (path), GNUNET_NO);
1893 GNUNET_assert (NULL == GCC_send_prebuilt_message (message, 0, 0, c,
1894 GNUNET_YES, GNUNET_YES,
1897 path_destroy (path);
1903 * Core handler for path confirmations.
1905 * @param cls closure
1906 * @param message message
1907 * @param peer peer identity this notification is about
1909 * @return GNUNET_OK to keep the connection open,
1910 * GNUNET_SYSERR to close it (signal serious error)
1913 GCC_handle_confirm (void *cls, const struct GNUNET_PeerIdentity *peer,
1914 const struct GNUNET_MessageHeader *message)
1916 struct GNUNET_CADET_ConnectionACK *msg;
1917 struct CadetConnection *c;
1918 struct CadetPeerPath *p;
1919 struct CadetPeer *pi;
1920 enum CadetConnectionState oldstate;
1923 msg = (struct GNUNET_CADET_ConnectionACK *) message;
1924 log_message (message, peer, &msg->cid);
1925 c = connection_get (&msg->cid);
1928 GNUNET_STATISTICS_update (stats, "# control on unknown connection",
1930 LOG (GNUNET_ERROR_TYPE_DEBUG, " don't know the connection!\n");
1931 send_broken_unknown (&msg->cid, &my_full_id, NULL, peer);
1935 if (GNUNET_NO != c->destroy)
1937 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection being destroyed\n");
1941 oldstate = c->state;
1942 LOG (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n", GNUNET_i2s (peer));
1943 pi = GCP_get (peer);
1944 if (get_next_hop (c) == pi)
1946 LOG (GNUNET_ERROR_TYPE_DEBUG, " SYNACK\n");
1948 if (CADET_CONNECTION_SENT == oldstate)
1949 connection_change_state (c, CADET_CONNECTION_ACK);
1951 else if (get_prev_hop (c) == pi)
1953 LOG (GNUNET_ERROR_TYPE_DEBUG, " FINAL ACK\n");
1955 connection_change_state (c, CADET_CONNECTION_READY);
1959 GNUNET_break_op (0);
1963 connection_reset_timeout (c, fwd);
1965 /* Add path to peers? */
1969 GCP_add_path_to_all (p, GNUNET_YES);
1976 /* Message for us as creator? */
1977 if (GCC_is_origin (c, GNUNET_YES))
1979 if (GNUNET_NO != fwd)
1981 GNUNET_break_op (0);
1984 LOG (GNUNET_ERROR_TYPE_DEBUG, " Connection (SYN)ACK for us!\n");
1986 /* If just created, cancel the short timeout and start a long one */
1987 if (CADET_CONNECTION_SENT == oldstate)
1988 connection_reset_timeout (c, GNUNET_YES);
1990 /* Change connection state */
1991 connection_change_state (c, CADET_CONNECTION_READY);
1992 send_connection_ack (c, GNUNET_YES);
1994 /* Change tunnel state, trigger KX */
1995 if (CADET_TUNNEL_WAITING == GCT_get_cstate (c->t))
1996 GCT_change_cstate (c->t, CADET_TUNNEL_READY);
2001 /* Message for us as destination? */
2002 if (GCC_is_terminal (c, GNUNET_YES))
2004 if (GNUNET_YES != fwd)
2006 GNUNET_break_op (0);
2009 LOG (GNUNET_ERROR_TYPE_DEBUG, " Connection ACK for us!\n");
2011 /* If just created, cancel the short timeout and start a long one */
2012 if (CADET_CONNECTION_ACK == oldstate)
2013 connection_reset_timeout (c, GNUNET_NO);
2015 /* Change tunnel state */
2016 if (CADET_TUNNEL_WAITING == GCT_get_cstate (c->t))
2017 GCT_change_cstate (c->t, CADET_TUNNEL_READY);
2022 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
2023 GNUNET_assert (NULL == GCC_send_prebuilt_message (message, 0, 0, c, fwd,
2024 GNUNET_YES, NULL, NULL));
2030 * Core handler for notifications of broken connections.
2032 * @param cls Closure (unused).
2033 * @param id Peer identity of sending neighbor.
2034 * @param message Message.
2036 * @return #GNUNET_OK to keep the connection open,
2037 * #GNUNET_SYSERR to close it (signal serious error)
2040 GCC_handle_broken (void* cls,
2041 const struct GNUNET_PeerIdentity* id,
2042 const struct GNUNET_MessageHeader* message)
2044 struct GNUNET_CADET_ConnectionBroken *msg;
2045 struct CadetConnection *c;
2046 struct CadetTunnel *t;
2050 msg = (struct GNUNET_CADET_ConnectionBroken *) message;
2051 log_message (message, id, &msg->cid);
2052 LOG (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
2053 GNUNET_i2s (&msg->peer1));
2054 LOG (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
2055 GNUNET_i2s (&msg->peer2));
2056 c = connection_get (&msg->cid);
2059 LOG (GNUNET_ERROR_TYPE_DEBUG, " duplicate CONNECTION_BROKEN\n");
2065 fwd = is_fwd (c, id);
2066 c->destroy = GNUNET_YES;
2067 if (GCC_is_terminal (c, fwd))
2069 struct CadetPeer *endpoint;
2073 /* A terminal connection should not have 't' set to NULL. */
2075 GCC_debug (c, GNUNET_ERROR_TYPE_ERROR);
2078 endpoint = GCP_get_short (c->path->peers[c->path->length - 1]);
2079 if (2 < c->path->length)
2080 path_invalidate (c->path);
2081 GCP_notify_broken_link (endpoint, &msg->peer1, &msg->peer2);
2083 c->state = CADET_CONNECTION_BROKEN;
2084 GCT_remove_connection (t, c);
2087 pending = c->pending_messages;
2089 resend_messages_and_destroy (c, !fwd);
2095 GNUNET_assert (NULL == GCC_send_prebuilt_message (message, 0, 0, c, fwd,
2096 GNUNET_YES, NULL, NULL));
2097 connection_cancel_queues (c, !fwd);
2105 * Core handler for tunnel destruction
2107 * @param cls Closure (unused).
2108 * @param peer Peer identity of sending neighbor.
2109 * @param message Message.
2110 * @return #GNUNET_OK to keep the connection open,
2111 * #GNUNET_SYSERR to close it (signal serious error)
2114 GCC_handle_destroy (void *cls,
2115 const struct GNUNET_PeerIdentity *peer,
2116 const struct GNUNET_MessageHeader *message)
2118 const struct GNUNET_CADET_ConnectionDestroy *msg;
2119 struct CadetConnection *c;
2122 msg = (const struct GNUNET_CADET_ConnectionDestroy *) message;
2123 log_message (message, peer, &msg->cid);
2124 c = connection_get (&msg->cid);
2127 /* Probably already got the message from another path,
2128 * destroyed the tunnel and retransmitted to children.
2131 GNUNET_STATISTICS_update (stats, "# control on unknown connection",
2133 LOG (GNUNET_ERROR_TYPE_DEBUG,
2134 " connection unknown: already destroyed?\n");
2137 fwd = is_fwd (c, peer);
2138 if (GNUNET_SYSERR == fwd)
2140 GNUNET_break_op (0); /* FIXME */
2143 if (GNUNET_NO == GCC_is_terminal (c, fwd))
2144 GNUNET_assert (NULL == GCC_send_prebuilt_message (message, 0, 0, c, fwd,
2145 GNUNET_YES, NULL, NULL));
2146 else if (0 == c->pending_messages)
2148 LOG (GNUNET_ERROR_TYPE_DEBUG, " directly destroying connection!\n");
2152 c->destroy = GNUNET_YES;
2153 c->state = CADET_CONNECTION_DESTROYED;
2156 GCT_remove_connection (c->t, c);
2165 * Check the message against internal state and test if it goes FWD or BCK.
2167 * Updates the PID, state and timeout values for the connection.
2169 * @param message Message to check. It must belong to an existing connection.
2170 * @param minimum_size The message cannot be smaller than this value.
2171 * @param cid Connection ID (even if @a c is NULL, the ID is still needed).
2172 * @param c Connection this message should belong. If NULL, check fails.
2173 * @param neighbor Neighbor that sent the message.
2176 check_message (const struct GNUNET_MessageHeader *message,
2177 size_t minimum_size,
2178 const struct GNUNET_CADET_Hash* cid,
2179 struct CadetConnection *c,
2180 const struct GNUNET_PeerIdentity *neighbor,
2183 GNUNET_PEER_Id neighbor_id;
2184 struct CadetFlowControl *fc;
2185 struct CadetPeer *hop;
2190 if (ntohs (message->size) < minimum_size)
2192 GNUNET_break_op (0);
2193 LOG (GNUNET_ERROR_TYPE_WARNING, "Size %u < %u\n",
2194 ntohs (message->size), minimum_size);
2195 return GNUNET_SYSERR;
2198 /* Check connection */
2201 GNUNET_STATISTICS_update (stats, "# unknown connection", 1, GNUNET_NO);
2202 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s on unknown connection %s\n",
2203 GC_m2s (ntohs (message->type)), GNUNET_h2s (GC_h2hc (cid)));
2204 send_broken_unknown (cid, &my_full_id, NULL, neighbor);
2205 return GNUNET_SYSERR;
2208 /* Check if origin is as expected */
2209 neighbor_id = GNUNET_PEER_search (neighbor);
2210 hop = get_prev_hop (c);
2211 if (neighbor_id == GCP_get_short_id (hop))
2217 hop = get_next_hop (c);
2218 GNUNET_break (hop == c->next_peer);
2219 if (neighbor_id == GCP_get_short_id (hop))
2225 /* Unexpected peer sending traffic on a connection. */
2226 GNUNET_break_op (0);
2227 return GNUNET_SYSERR;
2231 /* Check PID for payload messages */
2232 type = ntohs (message->type);
2233 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == type
2234 || GNUNET_MESSAGE_TYPE_CADET_AX == type)
2236 fc = fwd ? &c->bck_fc : &c->fwd_fc;
2237 LOG (GNUNET_ERROR_TYPE_DEBUG, " PID %u (expected %u - %u)\n",
2238 pid, fc->last_pid_recv + 1, fc->last_ack_sent);
2239 if (GC_is_pid_bigger (pid, fc->last_ack_sent))
2241 GNUNET_break_op (0);
2242 GNUNET_STATISTICS_update (stats, "# unsolicited message", 1, GNUNET_NO);
2243 LOG (GNUNET_ERROR_TYPE_WARNING, "Received PID %u, (prev %u), ACK %u\n",
2244 pid, fc->last_pid_recv, fc->last_ack_sent);
2245 return GNUNET_SYSERR;
2247 if (GC_is_pid_bigger (pid, fc->last_pid_recv))
2251 delta = pid - fc->last_pid_recv;
2252 fc->last_pid_recv = pid;
2253 fc->recv_bitmap <<= delta;
2254 fc->recv_bitmap |= 1;
2258 GNUNET_STATISTICS_update (stats, "# out of order PID", 1, GNUNET_NO);
2259 if (GNUNET_NO == is_ooo_ok (fc->last_pid_recv, pid, fc->recv_bitmap))
2261 LOG (GNUNET_ERROR_TYPE_WARNING, "PID %u unexpected (%u+), dropping!\n",
2262 pid, fc->last_pid_recv - 31);
2263 return GNUNET_SYSERR;
2265 fc->recv_bitmap |= get_recv_bitmask (fc->last_pid_recv, pid);
2269 /* Count as connection confirmation. */
2270 if (CADET_CONNECTION_SENT == c->state || CADET_CONNECTION_ACK == c->state)
2272 connection_change_state (c, CADET_CONNECTION_READY);
2275 if (CADET_TUNNEL_WAITING == GCT_get_cstate (c->t))
2276 GCT_change_cstate (c->t, CADET_TUNNEL_READY);
2279 connection_reset_timeout (c, fwd);
2286 * Generic handler for cadet network encrypted traffic.
2288 * @param peer Peer identity this notification is about.
2289 * @param msg Encrypted message.
2291 * @return GNUNET_OK to keep the connection open,
2292 * GNUNET_SYSERR to close it (signal serious error)
2295 handle_cadet_encrypted (const struct GNUNET_PeerIdentity *peer,
2296 const struct GNUNET_MessageHeader *message)
2298 const struct GNUNET_CADET_Encrypted *otr_msg;
2299 const struct GNUNET_CADET_AX *ax_msg;
2300 const struct GNUNET_CADET_Hash* cid;
2301 struct CadetConnection *c;
2302 size_t minumum_size;
2308 if (GNUNET_MESSAGE_TYPE_CADET_AX == ntohs (message->type))
2310 overhead = sizeof (struct GNUNET_CADET_AX);
2311 ax_msg = (const struct GNUNET_CADET_AX *) message;
2313 pid = ntohl (ax_msg->pid);
2318 overhead = sizeof (struct GNUNET_CADET_Encrypted);
2319 otr_msg = (const struct GNUNET_CADET_Encrypted *) message;
2320 cid = &otr_msg->cid;
2321 pid = ntohl (otr_msg->pid);
2324 log_message (message, peer, cid);
2326 minumum_size = sizeof (struct GNUNET_MessageHeader) + overhead;
2327 c = connection_get (cid);
2328 fwd = check_message (message, minumum_size, cid, c, peer, pid);
2330 /* If something went wrong, discard message. */
2331 if (GNUNET_SYSERR == fwd)
2334 /* Is this message for us? */
2335 if (GCC_is_terminal (c, fwd))
2337 GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO);
2341 GNUNET_break (GNUNET_NO != c->destroy);
2344 GCT_handle_encrypted (c->t, message);
2345 GCC_send_ack (c, fwd, GNUNET_NO);
2349 /* Message not for us: forward to next hop */
2350 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
2351 if (NULL != otr_msg) /* only otr has ttl */
2353 ttl = ntohl (otr_msg->ttl);
2354 LOG (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
2357 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
2358 LOG (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
2359 GCC_send_ack (c, fwd, GNUNET_NO);
2364 GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
2365 GNUNET_assert (NULL == GCC_send_prebuilt_message (message, 0, 0, c, fwd,
2366 GNUNET_NO, NULL, NULL));
2372 * Generic handler for cadet network encrypted traffic.
2374 * @param peer Peer identity this notification is about.
2375 * @param msg Encrypted message.
2377 * @return GNUNET_OK to keep the connection open,
2378 * GNUNET_SYSERR to close it (signal serious error)
2381 handle_cadet_kx (const struct GNUNET_PeerIdentity *peer,
2382 const struct GNUNET_CADET_KX *msg)
2384 const struct GNUNET_CADET_Hash* cid;
2385 struct CadetConnection *c;
2386 size_t expected_size;
2390 log_message (&msg->header, peer, cid);
2392 expected_size = sizeof (struct GNUNET_CADET_KX)
2393 + sizeof (struct GNUNET_MessageHeader);
2394 c = connection_get (cid);
2395 fwd = check_message (&msg->header, expected_size, cid, c, peer, 0);
2397 /* If something went wrong, discard message. */
2398 if (GNUNET_SYSERR == fwd)
2401 /* Is this message for us? */
2402 if (GCC_is_terminal (c, fwd))
2404 LOG (GNUNET_ERROR_TYPE_DEBUG, " message for us!\n");
2405 GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO);
2411 GCT_handle_kx (c->t, &msg[1].header);
2415 /* Message not for us: forward to next hop */
2416 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
2417 GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
2418 GNUNET_assert (NULL == GCC_send_prebuilt_message (&msg->header, 0, 0, c, fwd,
2419 GNUNET_NO, NULL, NULL));
2426 * Core handler for key exchange traffic (ephemeral key, ping, pong).
2428 * @param cls Closure (unused).
2429 * @param message Message received.
2430 * @param peer Peer who sent the message.
2432 * @return GNUNET_OK to keep the connection open,
2433 * GNUNET_SYSERR to close it (signal serious error)
2436 GCC_handle_kx (void *cls, const struct GNUNET_PeerIdentity *peer,
2437 const struct GNUNET_MessageHeader *message)
2439 return handle_cadet_kx (peer, (struct GNUNET_CADET_KX *) message);
2444 * Core handler for encrypted cadet network traffic (channel mgmt, data).
2446 * @param cls Closure (unused).
2447 * @param message Message received.
2448 * @param peer Peer who sent the message.
2450 * @return GNUNET_OK to keep the connection open,
2451 * GNUNET_SYSERR to close it (signal serious error)
2454 GCC_handle_encrypted (void *cls, const struct GNUNET_PeerIdentity *peer,
2455 const struct GNUNET_MessageHeader *message)
2457 return handle_cadet_encrypted (peer, message);
2462 * Core handler for cadet network traffic point-to-point acks.
2464 * @param cls closure
2465 * @param message message
2466 * @param peer peer identity this notification is about
2468 * @return GNUNET_OK to keep the connection open,
2469 * GNUNET_SYSERR to close it (signal serious error)
2472 GCC_handle_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
2473 const struct GNUNET_MessageHeader *message)
2475 struct GNUNET_CADET_ACK *msg;
2476 struct CadetConnection *c;
2477 struct CadetFlowControl *fc;
2482 msg = (struct GNUNET_CADET_ACK *) message;
2483 log_message (message, peer, &msg->cid);
2484 c = connection_get (&msg->cid);
2487 GNUNET_STATISTICS_update (stats, "# ack on unknown connection", 1,
2489 send_broken_unknown (&msg->cid, &my_full_id, NULL, peer);
2493 /* Is this a forward or backward ACK? */
2494 id = GNUNET_PEER_search (peer);
2495 if (GCP_get_short_id (get_next_hop (c)) == id)
2500 else if (GCP_get_short_id (get_prev_hop (c)) == id)
2507 GNUNET_break_op (0);
2511 ack = ntohl (msg->ack);
2512 LOG (GNUNET_ERROR_TYPE_DEBUG, " %s ACK %u (was %u)\n",
2513 GC_f2s (fwd), ack, fc->last_ack_recv);
2514 if (GC_is_pid_bigger (ack, fc->last_ack_recv))
2515 fc->last_ack_recv = ack;
2517 /* Cancel polling if the ACK is big enough. */
2518 if (NULL != fc->poll_task &&
2519 GC_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
2521 LOG (GNUNET_ERROR_TYPE_DEBUG, " Cancel poll\n");
2522 GNUNET_SCHEDULER_cancel (fc->poll_task);
2523 fc->poll_task = NULL;
2524 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
2527 connection_unlock_queue (c, fwd);
2534 * Core handler for cadet network traffic point-to-point ack polls.
2536 * @param cls closure
2537 * @param message message
2538 * @param peer peer identity this notification is about
2540 * @return GNUNET_OK to keep the connection open,
2541 * GNUNET_SYSERR to close it (signal serious error)
2544 GCC_handle_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
2545 const struct GNUNET_MessageHeader *message)
2547 struct GNUNET_CADET_Poll *msg;
2548 struct CadetConnection *c;
2549 struct CadetFlowControl *fc;
2554 msg = (struct GNUNET_CADET_Poll *) message;
2555 log_message (message, peer, &msg->cid);
2556 c = connection_get (&msg->cid);
2559 GNUNET_STATISTICS_update (stats, "# poll on unknown connection", 1,
2561 LOG (GNUNET_ERROR_TYPE_DEBUG, "POLL message on unknown connection %s!\n",
2562 GNUNET_h2s (GC_h2hc (&msg->cid)));
2563 send_broken_unknown (&msg->cid, &my_full_id, NULL, peer);
2567 /* Is this a forward or backward ACK?
2568 * Note: a poll should never be needed in a loopback case,
2569 * since there is no possiblility of packet loss there, so
2570 * this way of discerining FWD/BCK should not be a problem.
2572 id = GNUNET_PEER_search (peer);
2573 if (GCP_get_short_id (get_next_hop (c)) == id)
2575 LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD FC\n");
2578 else if (GCP_get_short_id (get_prev_hop (c)) == id)
2580 LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK FC\n");
2585 GNUNET_break_op (0);
2589 pid = ntohl (msg->pid);
2590 LOG (GNUNET_ERROR_TYPE_DEBUG, " PID %u, OLD %u\n", pid, fc->last_pid_recv);
2591 fc->last_pid_recv = pid;
2592 fwd = fc == &c->bck_fc;
2593 GCC_send_ack (c, fwd, GNUNET_YES);
2600 * Send an ACK on the appropriate connection/channel, depending on
2601 * the direction and the position of the peer.
2603 * @param c Which connection to send the hop-by-hop ACK.
2604 * @param fwd Is this a fwd ACK? (will go dest->root).
2605 * @param force Send the ACK even if suboptimal (e.g. requested by POLL).
2608 GCC_send_ack (struct CadetConnection *c, int fwd, int force)
2610 unsigned int buffer;
2612 LOG (GNUNET_ERROR_TYPE_DEBUG, "GCC send %s ACK on %s\n",
2613 GC_f2s (fwd), GCC_2s (c));
2621 if (GNUNET_NO != c->destroy)
2623 LOG (GNUNET_ERROR_TYPE_DEBUG, " being destroyed, why bother...\n");
2627 /* Get available buffer space */
2628 if (GCC_is_terminal (c, fwd))
2630 LOG (GNUNET_ERROR_TYPE_DEBUG, " getting from all channels\n");
2631 buffer = GCT_get_channels_buffer (c->t);
2635 LOG (GNUNET_ERROR_TYPE_DEBUG, " getting from one connection\n");
2636 buffer = GCC_get_buffer (c, fwd);
2638 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer available: %u\n", buffer);
2639 if (0 == buffer && GNUNET_NO == force)
2642 /* Send available buffer space */
2643 if (GCC_is_origin (c, fwd))
2645 GNUNET_assert (NULL != c->t);
2646 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on channels...\n");
2647 GCT_unchoke_channels (c->t);
2651 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on connection\n");
2652 send_ack (c, buffer, fwd, force);
2658 * Initialize the connections subsystem
2660 * @param c Configuration handle.
2663 GCC_init (const struct GNUNET_CONFIGURATION_Handle *c)
2665 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
2667 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_MSGS_QUEUE",
2670 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
2671 "CADET", "MAX_MSGS_QUEUE", "MISSING");
2672 GNUNET_SCHEDULER_shutdown ();
2677 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_CONNECTIONS",
2680 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
2681 "CADET", "MAX_CONNECTIONS", "MISSING");
2682 GNUNET_SCHEDULER_shutdown ();
2687 GNUNET_CONFIGURATION_get_value_time (c, "CADET", "REFRESH_CONNECTION_TIME",
2688 &refresh_connection_time))
2690 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
2691 "CADET", "REFRESH_CONNECTION_TIME", "MISSING");
2692 GNUNET_SCHEDULER_shutdown ();
2695 create_connection_time = GNUNET_TIME_UNIT_SECONDS;
2696 connections = GNUNET_CONTAINER_multihashmap_create (1024, GNUNET_NO);
2701 * Destroy each connection on shutdown.
2703 * @param cls Closure (unused).
2704 * @param key Current key code (CID, unused).
2705 * @param value Value in the hash map (`struct CadetConnection`)
2707 * @return #GNUNET_YES, because we should continue to iterate
2710 shutdown_iterator (void *cls,
2711 const struct GNUNET_HashCode *key,
2714 struct CadetConnection *c = value;
2716 c->state = CADET_CONNECTION_DESTROYED;
2723 * Shut down the connections subsystem.
2728 GNUNET_CONTAINER_multihashmap_iterate (connections,
2731 GNUNET_CONTAINER_multihashmap_destroy (connections);
2737 * Create a connection.
2739 * @param cid Connection ID (either created locally or imposed remotely).
2740 * @param t Tunnel this connection belongs to (or NULL);
2741 * @param path Path this connection has to use (copy is made).
2742 * @param own_pos Own position in the @c path path.
2744 * @return Newly created connection, NULL in case of error (own id not in path).
2746 struct CadetConnection *
2747 GCC_new (const struct GNUNET_CADET_Hash *cid,
2748 struct CadetTunnel *t,
2749 struct CadetPeerPath *path,
2750 unsigned int own_pos)
2752 struct CadetConnection *c;
2753 struct CadetPeerPath *p;
2755 p = path_duplicate (path);
2756 c = GNUNET_new (struct CadetConnection);
2758 GNUNET_assert (GNUNET_OK ==
2759 GNUNET_CONTAINER_multihashmap_put (connections,
2761 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2762 fc_init (&c->fwd_fc);
2763 fc_init (&c->bck_fc);
2768 GNUNET_assert (own_pos <= p->length - 1);
2769 c->own_pos = own_pos;
2772 GNUNET_assert (NULL != p);
2773 if (GNUNET_OK != register_neighbors (c))
2777 /* We were the origin of this request, this means we have invalid
2778 * info about the paths to reach the destination. We must invalidate
2779 * the *original* path to avoid trying it again in the next minute.
2781 path_invalidate (path);
2784 path_destroy (c->path);
2789 LOG (GNUNET_ERROR_TYPE_INFO, "New connection %s\n", GCC_2s (c));
2795 GCC_destroy (struct CadetConnection *c)
2803 if (2 == c->destroy) /* cancel queues -> GCP_queue_cancel -> q_destroy -> */
2804 return; /* -> message_sent -> GCC_destroy. Don't loop. */
2807 LOG (GNUNET_ERROR_TYPE_DEBUG,
2808 "destroying connection %s\n",
2810 LOG (GNUNET_ERROR_TYPE_DEBUG,
2811 " fc's f: %p, b: %p\n",
2812 &c->fwd_fc, &c->bck_fc);
2813 LOG (GNUNET_ERROR_TYPE_DEBUG,
2814 " fc tasks f: %u, b: %u\n",
2815 c->fwd_fc.poll_task,
2816 c->bck_fc.poll_task);
2818 /* Cancel all traffic */
2819 if (NULL != c->path)
2821 connection_cancel_queues (c, GNUNET_YES);
2822 connection_cancel_queues (c, GNUNET_NO);
2824 unregister_neighbors (c);
2825 path_destroy (c->path);
2828 /* Cancel maintainance task (keepalive/timeout) */
2829 if (NULL != c->fwd_fc.poll_msg)
2831 GCC_cancel (c->fwd_fc.poll_msg);
2832 LOG (GNUNET_ERROR_TYPE_DEBUG,
2833 " POLL msg FWD canceled\n");
2835 if (NULL != c->bck_fc.poll_msg)
2837 GCC_cancel (c->bck_fc.poll_msg);
2838 LOG (GNUNET_ERROR_TYPE_DEBUG,
2839 " POLL msg BCK canceled\n");
2842 /* Delete from tunnel */
2844 GCT_remove_connection (c->t, c);
2846 if (NULL != c->fwd_maintenance_task)
2847 GNUNET_SCHEDULER_cancel (c->fwd_maintenance_task);
2848 if (NULL != c->bck_maintenance_task)
2849 GNUNET_SCHEDULER_cancel (c->bck_maintenance_task);
2850 if (NULL != c->fwd_fc.poll_task)
2852 GNUNET_SCHEDULER_cancel (c->fwd_fc.poll_task);
2853 LOG (GNUNET_ERROR_TYPE_DEBUG, " POLL task FWD canceled\n");
2855 if (NULL != c->bck_fc.poll_task)
2857 GNUNET_SCHEDULER_cancel (c->bck_fc.poll_task);
2858 LOG (GNUNET_ERROR_TYPE_DEBUG, " POLL task BCK canceled\n");
2861 GNUNET_break (GNUNET_YES ==
2862 GNUNET_CONTAINER_multihashmap_remove (connections,
2865 GNUNET_STATISTICS_update (stats,
2874 * Get the connection ID.
2876 * @param c Connection to get the ID from.
2878 * @return ID of the connection.
2880 const struct GNUNET_CADET_Hash *
2881 GCC_get_id (const struct CadetConnection *c)
2888 * Get the connection ID.
2890 * @param c Connection to get the ID from.
2892 * @return ID of the connection.
2894 const struct GNUNET_HashCode *
2895 GCC_get_h (const struct CadetConnection *c)
2897 return GC_h2hc (&c->id);
2902 * Get the connection path.
2904 * @param c Connection to get the path from.
2906 * @return path used by the connection.
2908 const struct CadetPeerPath *
2909 GCC_get_path (const struct CadetConnection *c)
2911 if (GNUNET_NO == c->destroy)
2918 * Get the connection state.
2920 * @param c Connection to get the state from.
2922 * @return state of the connection.
2924 enum CadetConnectionState
2925 GCC_get_state (const struct CadetConnection *c)
2931 * Get the connection tunnel.
2933 * @param c Connection to get the tunnel from.
2935 * @return tunnel of the connection.
2937 struct CadetTunnel *
2938 GCC_get_tunnel (const struct CadetConnection *c)
2945 * Get free buffer space in a connection.
2947 * @param c Connection.
2948 * @param fwd Is query about FWD traffic?
2950 * @return Free buffer space [0 - max_msgs_queue/max_connections]
2953 GCC_get_buffer (struct CadetConnection *c, int fwd)
2955 struct CadetFlowControl *fc;
2957 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2959 LOG (GNUNET_ERROR_TYPE_DEBUG, " Get %s buffer on %s: %u - %u\n",
2960 GC_f2s (fwd), GCC_2s (c), fc->queue_max, fc->queue_n);
2961 GCC_debug (c, GNUNET_ERROR_TYPE_DEBUG);
2963 return (fc->queue_max - fc->queue_n);
2967 * Get how many messages have we allowed to send to us from a direction.
2969 * @param c Connection.
2970 * @param fwd Are we asking about traffic from FWD (BCK messages)?
2972 * @return last_ack_sent - last_pid_recv
2975 GCC_get_allowed (struct CadetConnection *c, int fwd)
2977 struct CadetFlowControl *fc;
2979 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2980 if (CADET_CONNECTION_READY != c->state
2981 || GC_is_pid_bigger (fc->last_pid_recv, fc->last_ack_sent))
2985 return (fc->last_ack_sent - fc->last_pid_recv);
2989 * Get messages queued in a connection.
2991 * @param c Connection.
2992 * @param fwd Is query about FWD traffic?
2994 * @return Number of messages queued.
2997 GCC_get_qn (struct CadetConnection *c, int fwd)
2999 struct CadetFlowControl *fc;
3001 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3008 * Get next PID to use.
3010 * @param c Connection.
3011 * @param fwd Is query about FWD traffic?
3013 * @return Last PID used + 1.
3016 GCC_get_pid (struct CadetConnection *c, int fwd)
3018 struct CadetFlowControl *fc;
3020 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3022 return fc->last_pid_sent + 1;
3027 * Allow the connection to advertise a buffer of the given size.
3029 * The connection will send an @c fwd ACK message (so: in direction !fwd)
3030 * allowing up to last_pid_recv + buffer.
3032 * @param c Connection.
3033 * @param buffer How many more messages the connection can accept.
3034 * @param fwd Is this about FWD traffic? (The ack will go dest->root).
3037 GCC_allow (struct CadetConnection *c, unsigned int buffer, int fwd)
3039 LOG (GNUNET_ERROR_TYPE_DEBUG, " allowing %s %u messages %s\n",
3040 GCC_2s (c), buffer, GC_f2s (fwd));
3041 send_ack (c, buffer, fwd, GNUNET_NO);
3046 * Notify other peers on a connection of a broken link. Mark connections
3047 * to destroy after all traffic has been sent.
3049 * @param c Connection on which there has been a disconnection.
3050 * @param peer Peer that disconnected.
3053 GCC_notify_broken (struct CadetConnection *c,
3054 struct CadetPeer *peer)
3056 struct CadetPeer *hop;
3059 LOG (GNUNET_ERROR_TYPE_DEBUG,
3060 "Notify broken on %s due to %s disconnect\n",
3063 hop = get_prev_hop (c);
3066 /* Path was NULL, we should have deleted the connection. */
3070 fwd = (peer == hop);
3071 if (GNUNET_YES == GCC_is_terminal (c, fwd))
3073 /* Local shutdown, no one to notify about this. */
3077 if (GNUNET_NO == c->destroy)
3078 send_broken (c, &my_full_id, GCP_get_id (peer), fwd);
3080 /* Connection will have at least one pending message
3081 * (the one we just scheduled), so no point in checking whether to
3082 * destroy immediately. */
3083 c->destroy = GNUNET_YES;
3084 c->state = CADET_CONNECTION_DESTROYED;
3087 * Cancel all queues, if no message is left, connection will be destroyed.
3089 connection_cancel_queues (c, !fwd);
3094 * Is this peer the first one on the connection?
3096 * @param c Connection.
3097 * @param fwd Is this about fwd traffic?
3099 * @return #GNUNET_YES if origin, #GNUNET_NO if relay/terminal.
3102 GCC_is_origin (struct CadetConnection *c, int fwd)
3104 if (!fwd && c->path->length - 1 == c->own_pos )
3106 if (fwd && 0 == c->own_pos)
3113 * Is this peer the last one on the connection?
3115 * @param c Connection.
3116 * @param fwd Is this about fwd traffic?
3117 * Note that the ROOT is the terminal for BCK traffic!
3119 * @return #GNUNET_YES if terminal, #GNUNET_NO if relay/origin.
3122 GCC_is_terminal (struct CadetConnection *c, int fwd)
3124 return GCC_is_origin (c, !fwd);
3129 * See if we are allowed to send by the next hop in the given direction.
3131 * @param c Connection.
3132 * @param fwd Is this about fwd traffic?
3134 * @return #GNUNET_YES in case it's OK to send.
3137 GCC_is_sendable (struct CadetConnection *c, int fwd)
3139 struct CadetFlowControl *fc;
3141 LOG (GNUNET_ERROR_TYPE_DEBUG, " checking sendability of %s traffic on %s\n",
3142 GC_f2s (fwd), GCC_2s (c));
3148 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3149 LOG (GNUNET_ERROR_TYPE_DEBUG,
3150 " last ack recv: %u, last pid sent: %u\n",
3151 fc->last_ack_recv, fc->last_pid_sent);
3152 if (GC_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
3154 LOG (GNUNET_ERROR_TYPE_DEBUG, " sendable\n");
3157 LOG (GNUNET_ERROR_TYPE_DEBUG, " not sendable\n");
3163 * Check if this connection is a direct one (never trim a direct connection).
3165 * @param c Connection.
3167 * @return #GNUNET_YES in case it's a direct connection, #GNUNET_NO otherwise.
3170 GCC_is_direct (struct CadetConnection *c)
3172 return (c->path->length == 2) ? GNUNET_YES : GNUNET_NO;
3176 * Sends an already built message on a connection, properly registering
3177 * all used resources.
3179 * @param message Message to send. Function makes a copy of it.
3180 * If message is not hop-by-hop, decrements TTL of copy.
3181 * @param payload_type Type of payload, in case the message is encrypted.
3182 * @param c Connection on which this message is transmitted.
3183 * @param fwd Is this a fwd message?
3184 * @param force Force the connection to accept the message (buffer overfill).
3185 * @param cont Continuation called once message is sent. Can be NULL.
3186 * @param cont_cls Closure for @c cont.
3188 * @return Handle to cancel the message before it's sent.
3189 * NULL on error or if @c cont is NULL.
3190 * Invalid on @c cont call.
3192 struct CadetConnectionQueue *
3193 GCC_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
3194 uint16_t payload_type, uint32_t payload_id,
3195 struct CadetConnection *c, int fwd, int force,
3196 GCC_sent cont, void *cont_cls)
3198 struct CadetFlowControl *fc;
3199 struct CadetConnectionQueue *q;
3205 size = ntohs (message->size);
3206 data = GNUNET_malloc (size);
3207 memcpy (data, message, size);
3208 type = ntohs (message->type);
3209 LOG (GNUNET_ERROR_TYPE_INFO, "--> %s (%s %4u) on connection %s (%u bytes)\n",
3210 GC_m2s (type), GC_m2s (payload_type), payload_id, GCC_2s (c), size);
3212 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3213 droppable = GNUNET_NO == force;
3216 struct GNUNET_CADET_AX *axmsg;
3217 struct GNUNET_CADET_Encrypted *emsg;
3218 struct GNUNET_CADET_KX *kmsg;
3219 struct GNUNET_CADET_ACK *amsg;
3220 struct GNUNET_CADET_Poll *pmsg;
3221 struct GNUNET_CADET_ConnectionDestroy *dmsg;
3222 struct GNUNET_CADET_ConnectionBroken *bmsg;
3225 case GNUNET_MESSAGE_TYPE_CADET_AX:
3226 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
3227 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == type)
3229 emsg = (struct GNUNET_CADET_Encrypted *) data;
3230 ttl = ntohl (emsg->ttl);
3233 GNUNET_break_op (0);
3238 emsg->ttl = htonl (ttl - 1);
3242 axmsg = (struct GNUNET_CADET_AX *) data;
3245 LOG (GNUNET_ERROR_TYPE_DEBUG, " Q_N+ %p %u\n", fc, fc->queue_n);
3246 LOG (GNUNET_ERROR_TYPE_DEBUG, "last pid sent %u\n", fc->last_pid_sent);
3247 LOG (GNUNET_ERROR_TYPE_DEBUG, " ack recv %u\n", fc->last_ack_recv);
3248 if (GNUNET_YES == droppable)
3254 LOG (GNUNET_ERROR_TYPE_DEBUG, " not droppable, Q_N stays the same\n");
3258 case GNUNET_MESSAGE_TYPE_CADET_KX:
3259 kmsg = (struct GNUNET_CADET_KX *) data;
3263 case GNUNET_MESSAGE_TYPE_CADET_ACK:
3264 amsg = (struct GNUNET_CADET_ACK *) data;
3266 LOG (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", ntohl (amsg->ack));
3267 droppable = GNUNET_NO;
3270 case GNUNET_MESSAGE_TYPE_CADET_POLL:
3271 pmsg = (struct GNUNET_CADET_Poll *) data;
3273 LOG (GNUNET_ERROR_TYPE_DEBUG, " POLL %u\n", ntohl (pmsg->pid));
3274 droppable = GNUNET_NO;
3277 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
3278 dmsg = (struct GNUNET_CADET_ConnectionDestroy *) data;
3282 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
3283 bmsg = (struct GNUNET_CADET_ConnectionBroken *) data;
3287 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
3288 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
3297 if (fc->queue_n > fc->queue_max && droppable)
3299 GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)",
3302 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue full: %u/%u\n",
3303 fc->queue_n, fc->queue_max);
3304 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == type
3305 || GNUNET_MESSAGE_TYPE_CADET_AX == type)
3310 return NULL; /* Drop this message */
3313 LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P+ %s %u\n",
3314 GCC_2s (c), c->pending_messages);
3315 c->pending_messages++;
3317 q = GNUNET_new (struct CadetConnectionQueue);
3318 q->forced = !droppable;
3319 q->q = GCP_queue_add (get_hop (c, fwd), data, type, payload_type, payload_id,
3320 size, c, fwd, &conn_message_sent, q);
3323 LOG (GNUNET_ERROR_TYPE_DEBUG, "dropping msg on %s, NULL q\n", GCC_2s (c));
3329 q->cont_cls = cont_cls;
3330 return (NULL == cont) ? NULL : q;
3335 * Cancel a previously sent message while it's in the queue.
3337 * ONLY can be called before the continuation given to the send function
3338 * is called. Once the continuation is called, the message is no longer in the
3341 * @param q Handle to the queue.
3344 GCC_cancel (struct CadetConnectionQueue *q)
3346 LOG (GNUNET_ERROR_TYPE_DEBUG, "! GCC cancel message\n");
3348 /* queue destroy calls message_sent, which calls q->cont and frees q */
3349 GCP_queue_destroy (q->q, GNUNET_YES, GNUNET_NO, 0);
3354 * Sends a CREATE CONNECTION message for a path to a peer.
3355 * Changes the connection and tunnel states if necessary.
3357 * @param connection Connection to create.
3360 GCC_send_create (struct CadetConnection *connection)
3362 enum CadetTunnelCState state;
3365 size = sizeof (struct GNUNET_CADET_ConnectionCreate);
3366 size += connection->path->length * sizeof (struct GNUNET_PeerIdentity);
3368 LOG (GNUNET_ERROR_TYPE_INFO, "---> %s on connection %s (%u bytes)\n",
3369 GC_m2s (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE),
3370 GCC_2s (connection), size);
3371 LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P+ %p %u (create)\n",
3372 connection, connection->pending_messages);
3373 connection->pending_messages++;
3375 connection->maintenance_q =
3376 GCP_queue_add (get_next_hop (connection), NULL,
3377 GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE, 0, 0,
3378 size, connection, GNUNET_YES, &conn_message_sent, NULL);
3380 state = GCT_get_cstate (connection->t);
3381 if (CADET_TUNNEL_SEARCHING == state || CADET_TUNNEL_NEW == state)
3382 GCT_change_cstate (connection->t, CADET_TUNNEL_WAITING);
3383 if (CADET_CONNECTION_NEW == connection->state)
3384 connection_change_state (connection, CADET_CONNECTION_SENT);
3389 * Send a message to all peers in this connection that the connection
3390 * is no longer valid.
3392 * If some peer should not receive the message, it should be zero'ed out
3393 * before calling this function.
3395 * @param c The connection whose peers to notify.
3398 GCC_send_destroy (struct CadetConnection *c)
3400 struct GNUNET_CADET_ConnectionDestroy msg;
3402 if (GNUNET_YES == c->destroy)
3405 msg.header.size = htons (sizeof (msg));
3406 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY);
3408 LOG (GNUNET_ERROR_TYPE_DEBUG,
3409 " sending connection destroy for connection %s\n",
3412 if (GNUNET_NO == GCC_is_terminal (c, GNUNET_YES))
3413 GNUNET_assert (NULL == GCC_send_prebuilt_message (&msg.header, 0, 0, c,
3414 GNUNET_YES, GNUNET_YES,
3416 if (GNUNET_NO == GCC_is_terminal (c, GNUNET_NO))
3417 GNUNET_assert (NULL == GCC_send_prebuilt_message (&msg.header, 0, 0, c,
3418 GNUNET_NO, GNUNET_YES,
3420 c->destroy = GNUNET_YES;
3421 c->state = CADET_CONNECTION_DESTROYED;
3426 * @brief Start a polling timer for the connection.
3428 * When a neighbor does not accept more traffic on the connection it could be
3429 * caused by a simple congestion or by a lost ACK. Polling enables to check
3430 * for the lastest ACK status for a connection.
3432 * @param c Connection.
3433 * @param fwd Should we poll in the FWD direction?
3436 GCC_start_poll (struct CadetConnection *c, int fwd)
3438 struct CadetFlowControl *fc;
3440 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3441 LOG (GNUNET_ERROR_TYPE_DEBUG, "POLL %s requested\n",
3443 if (NULL != fc->poll_task || NULL != fc->poll_msg)
3445 LOG (GNUNET_ERROR_TYPE_DEBUG, " POLL not needed (%p, %p)\n",
3446 fc->poll_task, fc->poll_msg);
3449 LOG (GNUNET_ERROR_TYPE_DEBUG, "POLL started on request\n");
3450 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
3457 * @brief Stop polling a connection for ACKs.
3459 * Once we have enough ACKs for future traffic, polls are no longer necessary.
3461 * @param c Connection.
3462 * @param fwd Should we stop the poll in the FWD direction?
3465 GCC_stop_poll (struct CadetConnection *c, int fwd)
3467 struct CadetFlowControl *fc;
3469 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3470 if (NULL != fc->poll_task)
3472 GNUNET_SCHEDULER_cancel (fc->poll_task);
3473 fc->poll_task = NULL;
3478 * Get a (static) string for a connection.
3480 * @param c Connection.
3483 GCC_2s (const struct CadetConnection *c)
3490 static char buf[128];
3492 SPRINTF (buf, "%s (->%s)",
3493 GNUNET_h2s (GC_h2hc (GCC_get_id (c))), GCT_2s (c->t));
3496 return GNUNET_h2s (GC_h2hc (&c->id));
3501 * Log all possible info about the connection state.
3503 * @param c Connection to debug.
3504 * @param level Debug level to use.
3507 GCC_debug (const struct CadetConnection *c, enum GNUNET_ErrorType level)
3512 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
3514 __FILE__, __FUNCTION__, __LINE__);
3520 LOG2 (level, "CCC DEBUG NULL CONNECTION\n");
3524 LOG2 (level, "CCC DEBUG CONNECTION %s\n", GCC_2s (c));
3525 s = path_2s (c->path);
3526 LOG2 (level, "CCC path %s, own pos: %u\n", s, c->own_pos);
3528 LOG2 (level, "CCC state: %s, destroy: %u\n",
3529 GCC_state2s (c->state), c->destroy);
3530 LOG2 (level, "CCC pending messages: %u\n", c->pending_messages);
3531 if (NULL != c->perf)
3532 LOG2 (level, "CCC us/byte: %f\n", c->perf->avg);
3534 LOG2 (level, "CCC FWD flow control:\n");
3535 LOG2 (level, "CCC queue: %u/%u\n", c->fwd_fc.queue_n, c->fwd_fc.queue_max);
3536 LOG2 (level, "CCC last PID sent: %5u, recv: %5u\n",
3537 c->fwd_fc.last_pid_sent, c->fwd_fc.last_pid_recv);
3538 LOG2 (level, "CCC last ACK sent: %5u, recv: %5u\n",
3539 c->fwd_fc.last_ack_sent, c->fwd_fc.last_ack_recv);
3540 LOG2 (level, "CCC recv PID bitmap: %X\n", c->fwd_fc.recv_bitmap);
3541 LOG2 (level, "CCC poll: task %d, msg %p, msg_ack %p)\n",
3542 c->fwd_fc.poll_task, c->fwd_fc.poll_msg, c->fwd_fc.ack_msg);
3544 LOG2 (level, "CCC BCK flow control:\n");
3545 LOG2 (level, "CCC queue: %u/%u\n", c->bck_fc.queue_n, c->bck_fc.queue_max);
3546 LOG2 (level, "CCC last PID sent: %5u, recv: %5u\n",
3547 c->bck_fc.last_pid_sent, c->bck_fc.last_pid_recv);
3548 LOG2 (level, "CCC last ACK sent: %5u, recv: %5u\n",
3549 c->bck_fc.last_ack_sent, c->bck_fc.last_ack_recv);
3550 LOG2 (level, "CCC recv PID bitmap: %X\n", c->bck_fc.recv_bitmap);
3551 LOG2 (level, "CCC poll: task %d, msg %p, msg_ack %p)\n",
3552 c->bck_fc.poll_task, c->bck_fc.poll_msg, c->bck_fc.ack_msg);
3554 LOG2 (level, "CCC DEBUG CONNECTION END\n");