2 This file is part of GNUnet.
3 Copyright (C) 2001-2013 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file cadet/gnunet-service-cadet_connection.c
23 * @brief GNUnet CADET service connection handling
24 * @author Bartlomiej Polot
28 #include "gnunet_util_lib.h"
30 #include "gnunet_statistics_service.h"
32 #include "cadet_path.h"
33 #include "cadet_protocol.h"
35 #include "gnunet-service-cadet_connection.h"
36 #include "gnunet-service-cadet_peer.h"
37 #include "gnunet-service-cadet_tunnel.h"
40 #define LOG(level, ...) GNUNET_log_from (level,"cadet-con",__VA_ARGS__)
41 #define LOG2(level, ...) GNUNET_log_from_nocheck(level,"cadet-con",__VA_ARGS__)
44 #define CADET_MAX_POLL_TIME GNUNET_TIME_relative_multiply (\
45 GNUNET_TIME_UNIT_MINUTES,\
50 /******************************************************************************/
51 /******************************** STRUCTS **********************************/
52 /******************************************************************************/
55 * Struct to encapsulate all the Flow Control information to a peer to which
56 * we are directly connected (on a core level).
58 struct CadetFlowControl
61 * Connection this controls.
63 struct CadetConnection *c;
66 * How many messages are in the queue on this connection.
71 * How many messages do we accept in the queue.
73 unsigned int queue_max;
76 * ID of the last packet sent towards the peer.
78 uint32_t last_pid_sent;
81 * ID of the last packet received from the peer.
83 uint32_t last_pid_recv;
86 * Bitmap of past 32 messages received:
87 * - LSB being @c last_pid_recv.
88 * - MSB being @c last_pid_recv - 31 (mod UINTMAX).
93 * Last ACK sent to the peer (peer can't send more than this PID).
95 uint32_t last_ack_sent;
98 * Last ACK sent towards the origin (for traffic towards leaf node).
100 uint32_t last_ack_recv;
103 * Task to poll the peer in case of a lost ACK causes stall.
105 struct GNUNET_SCHEDULER_Task * poll_task;
108 * How frequently to poll for ACKs.
110 struct GNUNET_TIME_Relative poll_time;
113 * Queued poll message, to cancel if not necessary anymore (got ACK).
115 struct CadetConnectionQueue *poll_msg;
118 * Queued poll message, to cancel if not necessary anymore (got ACK).
120 struct CadetConnectionQueue *ack_msg;
124 * Keep a record of the last messages sent on this connection.
126 struct CadetConnectionPerformance
129 * Circular buffer for storing measurements.
131 double usecsperbyte[AVG_MSGS];
134 * Running average of @c usecsperbyte.
139 * How many values of @c usecsperbyte are valid.
144 * Index of the next "free" position in @c usecsperbyte.
151 * Struct containing all information regarding a connection to a peer.
153 struct CadetConnection
156 * Tunnel this connection is part of.
158 struct CadetTunnel *t;
161 * Flow control information for traffic fwd.
163 struct CadetFlowControl fwd_fc;
166 * Flow control information for traffic bck.
168 struct CadetFlowControl bck_fc;
171 * Measure connection performance on the endpoint.
173 struct CadetConnectionPerformance *perf;
176 * ID of the connection.
178 struct GNUNET_CADET_Hash id;
181 * State of the connection.
183 enum CadetConnectionState state;
186 * Path being used for the tunnel. At the origin of the connection
187 * it's a pointer to the destination's path pool, otherwise just a copy.
189 struct CadetPeerPath *path;
192 * Position of the local peer in the path.
194 unsigned int own_pos;
197 * Task to keep the used paths alive at the owner,
198 * time tunnel out on all the other peers.
200 struct GNUNET_SCHEDULER_Task * fwd_maintenance_task;
203 * Task to keep the used paths alive at the destination,
204 * time tunnel out on all the other peers.
206 struct GNUNET_SCHEDULER_Task * bck_maintenance_task;
209 * Queue handle for maintainance traffic. One handle for FWD and BCK since
210 * one peer never needs to maintain both directions (no loopback connections).
212 struct CadetPeerQueue *maintenance_q;
215 * Counter to do exponential backoff when creating a connection (max 64).
217 unsigned short create_retry;
220 * Pending message count.
222 unsigned int pending_messages;
225 * Destroy flag: if true, destroy on last message.
231 * Handle for messages queued but not yet sent.
233 struct CadetConnectionQueue
236 * Peer queue handle, to cancel if necessary.
238 struct CadetPeerQueue *q;
241 * Was this a forced message? (Do not account for it)
246 * Continuation to call once sent.
251 * Closure for @c cont.
256 /******************************************************************************/
257 /******************************* GLOBALS ***********************************/
258 /******************************************************************************/
261 * Global handle to the statistics service.
263 extern struct GNUNET_STATISTICS_Handle *stats;
266 * Local peer own ID (memory efficient handle).
268 extern GNUNET_PEER_Id myid;
271 * Local peer own ID (full value).
273 extern struct GNUNET_PeerIdentity my_full_id;
276 * Connections known, indexed by cid (CadetConnection).
278 static struct GNUNET_CONTAINER_MultiHashMap *connections;
281 * How many connections are we willing to maintain.
282 * Local connections are always allowed, even if there are more connections than max.
284 static unsigned long long max_connections;
287 * How many messages *in total* are we willing to queue, divide by number of
288 * connections to get connection queue size.
290 static unsigned long long max_msgs_queue;
293 * How often to send path keepalives. Paths timeout after 4 missed.
295 static struct GNUNET_TIME_Relative refresh_connection_time;
298 * How often to send path create / ACKs.
300 static struct GNUNET_TIME_Relative create_connection_time;
303 /******************************************************************************/
304 /******************************** STATIC ***********************************/
305 /******************************************************************************/
307 #if 0 // avoid compiler warning for unused static function
309 fc_debug (struct CadetFlowControl *fc)
311 LOG (GNUNET_ERROR_TYPE_DEBUG, " IN: %u/%u\n",
312 fc->last_pid_recv, fc->last_ack_sent);
313 LOG (GNUNET_ERROR_TYPE_DEBUG, " OUT: %u/%u\n",
314 fc->last_pid_sent, fc->last_ack_recv);
315 LOG (GNUNET_ERROR_TYPE_DEBUG, " QUEUE: %u/%u\n",
316 fc->queue_n, fc->queue_max);
320 connection_debug (struct CadetConnection *c)
324 LOG (GNUNET_ERROR_TYPE_DEBUG, "*** DEBUG NULL CONNECTION ***\n");
327 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connection %s:%X\n",
328 peer2s (c->t->peer), GCC_2s (c));
329 LOG (GNUNET_ERROR_TYPE_DEBUG, " state: %u, pending msgs: %u\n",
330 c->state, c->pending_messages);
331 LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD FC\n");
332 fc_debug (&c->fwd_fc);
333 LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK FC\n");
334 fc_debug (&c->bck_fc);
340 * Schedule next keepalive task, taking in consideration
341 * the connection state and number of retries.
343 * @param c Connection for which to schedule the next keepalive.
344 * @param fwd Direction for the next keepalive.
347 schedule_next_keepalive (struct CadetConnection *c, int fwd);
351 * Resets the connection timeout task, some other message has done the
353 * - For the first peer on the direction this means to send
354 * a keepalive or a path confirmation message (either create or ACK).
355 * - For all other peers, this means to destroy the connection,
356 * due to lack of activity.
357 * Starts the timeout if no timeout was running (connection just created).
359 * @param c Connection whose timeout to reset.
360 * @param fwd Is this forward?
363 connection_reset_timeout (struct CadetConnection *c, int fwd);
367 * Get string description for tunnel state. Reentrant.
369 * @param s Tunnel state.
371 * @return String representation.
374 GCC_state2s (enum CadetConnectionState s)
378 case CADET_CONNECTION_NEW:
379 return "CADET_CONNECTION_NEW";
380 case CADET_CONNECTION_SENT:
381 return "CADET_CONNECTION_SENT";
382 case CADET_CONNECTION_ACK:
383 return "CADET_CONNECTION_ACK";
384 case CADET_CONNECTION_READY:
385 return "CADET_CONNECTION_READY";
386 case CADET_CONNECTION_DESTROYED:
387 return "CADET_CONNECTION_DESTROYED";
388 case CADET_CONNECTION_BROKEN:
389 return "CADET_CONNECTION_BROKEN";
392 LOG (GNUNET_ERROR_TYPE_ERROR, " conn state %u unknown!\n", s);
393 return "CADET_CONNECTION_STATE_ERROR";
399 * Initialize a Flow Control structure to the initial state.
401 * @param fc Flow Control structure to initialize.
404 fc_init (struct CadetFlowControl *fc)
406 fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
407 fc->last_pid_recv = (uint32_t) -1;
408 fc->last_ack_sent = (uint32_t) 0;
409 fc->last_ack_recv = (uint32_t) 0;
410 fc->poll_task = NULL;
411 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
413 fc->queue_max = (max_msgs_queue / max_connections) + 1;
420 * @param cid Connection ID.
422 static struct CadetConnection *
423 connection_get (const struct GNUNET_CADET_Hash *cid)
425 return GNUNET_CONTAINER_multihashmap_get (connections, GC_h2hc (cid));
430 connection_change_state (struct CadetConnection* c,
431 enum CadetConnectionState state)
433 LOG (GNUNET_ERROR_TYPE_DEBUG,
434 "Connection %s state %s -> %s\n",
435 GCC_2s (c), GCC_state2s (c->state), GCC_state2s (state));
436 if (CADET_CONNECTION_DESTROYED <= c->state) /* Destroyed or broken. */
438 LOG (GNUNET_ERROR_TYPE_DEBUG, "state not changing anymore\n");
442 if (CADET_CONNECTION_READY == state)
448 * Callback called when a queued ACK message is sent.
450 * @param cls Closure (FC).
451 * @param c Connection this message was on.
452 * @param q Queue handler this call invalidates.
453 * @param type Type of message sent.
454 * @param fwd Was this a FWD going message?
455 * @param size Size of the message.
459 struct CadetConnection *c,
460 struct CadetConnectionQueue *q,
461 uint16_t type, int fwd, size_t size)
463 struct CadetFlowControl *fc = cls;
470 * Send an ACK on the connection, informing the predecessor about
471 * the available buffer space. Should not be called in case the peer
472 * is origin (no predecessor) in the @c fwd direction.
474 * Note that for fwd ack, the FWD mean forward *traffic* (root->dest),
475 * the ACK itself goes "back" (dest->root).
477 * @param c Connection on which to send the ACK.
478 * @param buffer How much space free to advertise?
479 * @param fwd Is this FWD ACK? (Going dest -> root)
480 * @param force Don't optimize out.
483 send_ack (struct CadetConnection *c, unsigned int buffer, int fwd, int force)
485 struct CadetFlowControl *next_fc;
486 struct CadetFlowControl *prev_fc;
487 struct GNUNET_CADET_ACK msg;
491 /* If origin, there is no connection to send ACKs. Wrong function! */
492 if (GCC_is_origin (c, fwd))
494 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection %s is origin in %s\n",
495 GCC_2s (c), GC_f2s (fwd));
500 next_fc = fwd ? &c->fwd_fc : &c->bck_fc;
501 prev_fc = fwd ? &c->bck_fc : &c->fwd_fc;
503 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection send %s ack on %s\n",
504 GC_f2s (fwd), GCC_2s (c));
506 /* Check if we need to transmit the ACK. */
507 delta = prev_fc->last_ack_sent - prev_fc->last_pid_recv;
508 if (3 < delta && buffer < delta && GNUNET_NO == force)
510 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer > 3\n");
511 LOG (GNUNET_ERROR_TYPE_DEBUG,
512 " last pid recv: %u, last ack sent: %u\n",
513 prev_fc->last_pid_recv, prev_fc->last_ack_sent);
517 /* Ok, ACK might be necessary, what PID to ACK? */
518 ack = prev_fc->last_pid_recv + buffer;
519 LOG (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
520 LOG (GNUNET_ERROR_TYPE_DEBUG,
521 " last pid %u, last ack %u, qmax %u, q %u\n",
522 prev_fc->last_pid_recv, prev_fc->last_ack_sent,
523 next_fc->queue_max, next_fc->queue_n);
524 if (ack == prev_fc->last_ack_sent && GNUNET_NO == force)
526 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
530 /* Check if message is already in queue */
531 if (NULL != prev_fc->ack_msg)
533 if (GC_is_pid_bigger (ack, prev_fc->last_ack_sent))
535 LOG (GNUNET_ERROR_TYPE_DEBUG, " canceling old ACK\n");
536 GCC_cancel (prev_fc->ack_msg);
537 /* GCC_cancel triggers ack_sent(), which clears fc->ack_msg */
541 LOG (GNUNET_ERROR_TYPE_DEBUG, " same ACK already in queue\n");
546 prev_fc->last_ack_sent = ack;
548 /* Build ACK message and send on connection */
549 msg.header.size = htons (sizeof (msg));
550 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_ACK);
551 msg.ack = htonl (ack);
554 prev_fc->ack_msg = GCC_send_prebuilt_message (&msg.header, 0, ack, c,
557 GNUNET_assert (NULL != prev_fc->ack_msg);
562 * Callback called when a connection queued message is sent.
564 * Calculates the average time and connection packet tracking.
566 * @param cls Closure (ConnectionQueue Handle).
567 * @param c Connection this message was on.
568 * @param sent Was it really sent? (Could have been canceled)
569 * @param type Type of message sent.
570 * @param pid Packet ID, or 0 if not applicable (create, destroy, etc).
571 * @param fwd Was this a FWD going message?
572 * @param size Size of the message.
573 * @param wait Time spent waiting for core (only the time for THIS message)
575 * @return #GNUNET_YES if connection was destroyed, #GNUNET_NO otherwise.
578 conn_message_sent (void *cls,
579 struct CadetConnection *c, int sent,
580 uint16_t type, uint32_t pid, int fwd, size_t size,
581 struct GNUNET_TIME_Relative wait)
583 struct CadetConnectionPerformance *p;
584 struct CadetFlowControl *fc;
585 struct CadetConnectionQueue *q = cls;
589 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection message_sent\n");
591 fc = fwd ? &c->fwd_fc : &c->bck_fc;
592 LOG (GNUNET_ERROR_TYPE_DEBUG, " %ssent %s %s pid %u\n",
593 sent ? "" : "not ", GC_f2s (fwd), GC_m2s (type), pid);
599 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling cont\n");
600 q->cont (q->cont_cls, c, q, type, fwd, size);
604 else if (type == GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED
605 || type == GNUNET_MESSAGE_TYPE_CADET_AX)
607 /* If NULL == q and ENCRYPTED == type, message must have been ch_mngmnt */
616 if (type != GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN
617 && type != GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY)
619 LOG (GNUNET_ERROR_TYPE_ERROR, "Message %s sent on NULL connection!\n",
624 LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P- %p %u\n", c, c->pending_messages);
625 c->pending_messages--;
626 if (GNUNET_YES == c->destroy && 0 == c->pending_messages)
628 LOG (GNUNET_ERROR_TYPE_DEBUG, "! destroying connection!\n");
632 /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
635 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
636 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
637 c->maintenance_q = NULL;
638 /* Don't trigger a keepalive for sent ACKs, only SYN and SYNACKs */
639 if (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE == type || !fwd)
640 schedule_next_keepalive (c, fwd);
643 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
644 case GNUNET_MESSAGE_TYPE_CADET_AX:
645 if (GNUNET_YES == sent)
647 GNUNET_assert (NULL != q);
648 fc->last_pid_sent = pid; // FIXME
649 GCC_send_ack (c, fwd, GNUNET_NO);
650 connection_reset_timeout (c, fwd);
653 LOG (GNUNET_ERROR_TYPE_DEBUG, "! Q_N- %p %u\n", fc, fc->queue_n);
654 if (GNUNET_NO == forced)
657 LOG (GNUNET_ERROR_TYPE_DEBUG,
658 "! accounting pid %u\n",
663 LOG (GNUNET_ERROR_TYPE_DEBUG,
664 "! forced, Q_N not accounting pid %u\n",
669 case GNUNET_MESSAGE_TYPE_CADET_KX:
670 if (GNUNET_YES == sent)
671 connection_reset_timeout (c, fwd);
674 case GNUNET_MESSAGE_TYPE_CADET_POLL:
678 case GNUNET_MESSAGE_TYPE_CADET_ACK:
682 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
686 LOG (GNUNET_ERROR_TYPE_ERROR, "%s unknown\n", GC_m2s (type));
690 LOG (GNUNET_ERROR_TYPE_DEBUG, "! message sent!\n");
693 return GNUNET_NO; /* Only endpoints are interested in timing. */
696 usecsperbyte = ((double) wait.rel_value_us) / size;
697 if (p->size == AVG_MSGS)
699 /* Array is full. Substract oldest value, add new one and store. */
700 p->avg -= (p->usecsperbyte[p->idx] / AVG_MSGS);
701 p->usecsperbyte[p->idx] = usecsperbyte;
702 p->avg += (p->usecsperbyte[p->idx] / AVG_MSGS);
706 /* Array not yet full. Add current value to avg and store. */
707 p->usecsperbyte[p->idx] = usecsperbyte;
709 p->avg += p->usecsperbyte[p->idx];
713 p->idx = (p->idx + 1) % AVG_MSGS;
719 * Get the previous hop in a connection
721 * @param c Connection.
723 * @return Previous peer in the connection.
725 static struct CadetPeer *
726 get_prev_hop (const struct CadetConnection *c)
733 LOG (GNUNET_ERROR_TYPE_DEBUG, " get prev hop %s [%u/%u]\n",
734 GCC_2s (c), c->own_pos, c->path->length);
735 if (0 == c->own_pos || c->path->length < 2)
736 id = c->path->peers[0];
738 id = c->path->peers[c->own_pos - 1];
740 LOG (GNUNET_ERROR_TYPE_DEBUG, " ID: %s (%u)\n",
741 GNUNET_i2s (GNUNET_PEER_resolve2 (id)), id);
743 return GCP_get_short (id);
748 * Get the next hop in a connection
750 * @param c Connection.
752 * @return Next peer in the connection.
754 static struct CadetPeer *
755 get_next_hop (const struct CadetConnection *c)
762 LOG (GNUNET_ERROR_TYPE_DEBUG, " get next hop %s [%u/%u]\n",
763 GCC_2s (c), c->own_pos, c->path->length);
764 if ((c->path->length - 1) == c->own_pos || c->path->length < 2)
765 id = c->path->peers[c->path->length - 1];
767 id = c->path->peers[c->own_pos + 1];
769 LOG (GNUNET_ERROR_TYPE_DEBUG, " ID: %s (%u)\n",
770 GNUNET_i2s (GNUNET_PEER_resolve2 (id)), id);
772 return GCP_get_short (id);
777 * Get the hop in a connection.
779 * @param c Connection.
780 * @param fwd Next in the FWD direction?
782 * @return Next peer in the connection.
784 static struct CadetPeer *
785 get_hop (struct CadetConnection *c, int fwd)
788 return get_next_hop (c);
789 return get_prev_hop (c);
794 * Get a bit mask for a message received out-of-order.
796 * @param last_pid_recv Last PID we received prior to the out-of-order.
797 * @param ooo_pid PID of the out-of-order message.
800 get_recv_bitmask (uint32_t last_pid_recv, uint32_t ooo_pid)
802 return 1 << (last_pid_recv - ooo_pid);
807 * Check is an out-of-order message is ok:
808 * - at most 31 messages behind.
811 * @param last_pid_recv Last in-order PID received.
814 is_ooo_ok (uint32_t last_pid_recv, uint32_t ooo_pid, uint32_t ooo_bitmap)
818 if (GC_is_pid_bigger (last_pid_recv - 31, ooo_pid))
821 mask = get_recv_bitmask (last_pid_recv, ooo_pid);
822 if (0 != (ooo_bitmap & mask))
830 * Is traffic coming from this sender 'FWD' traffic?
832 * @param c Connection to check.
833 * @param sender Peer identity of neighbor.
835 * @return #GNUNET_YES in case the sender is the 'prev' hop and therefore
836 * the traffic is 'FWD'.
837 * #GNUNET_NO for BCK.
838 * #GNUNET_SYSERR for errors.
841 is_fwd (const struct CadetConnection *c,
842 const struct GNUNET_PeerIdentity *sender)
846 id = GNUNET_PEER_search (sender);
847 if (GCP_get_short_id (get_prev_hop (c)) == id)
850 if (GCP_get_short_id (get_next_hop (c)) == id)
854 return GNUNET_SYSERR;
859 * Sends a CONNECTION ACK message in reponse to a received CONNECTION_CREATE
860 * or a first CONNECTION_ACK directed to us.
862 * @param connection Connection to confirm.
863 * @param fwd Should we send it FWD? (root->dest)
864 * (First (~SYNACK) goes BCK, second (~ACK) goes FWD)
867 send_connection_ack (struct CadetConnection *connection, int fwd)
869 struct CadetTunnel *t;
872 LOG (GNUNET_ERROR_TYPE_INFO, "---> {%14s ACK} on connection %s\n",
873 GC_f2s (!fwd), GCC_2s (connection));
874 GCP_queue_add (get_hop (connection, fwd), NULL,
875 GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK, 0, 0,
876 sizeof (struct GNUNET_CADET_ConnectionACK),
877 connection, fwd, &conn_message_sent, NULL);
878 connection->pending_messages++;
879 if (CADET_TUNNEL_NEW == GCT_get_cstate (t))
880 GCT_change_cstate (t, CADET_TUNNEL_WAITING);
881 if (CADET_CONNECTION_READY != connection->state)
882 connection_change_state (connection, CADET_CONNECTION_SENT);
887 * Send a notification that a connection is broken.
889 * @param c Connection that is broken.
890 * @param id1 Peer that has disconnected.
891 * @param id2 Peer that has disconnected.
892 * @param fwd Direction towards which to send it.
895 send_broken (struct CadetConnection *c,
896 const struct GNUNET_PeerIdentity *id1,
897 const struct GNUNET_PeerIdentity *id2,
900 struct GNUNET_CADET_ConnectionBroken msg;
902 msg.header.size = htons (sizeof (struct GNUNET_CADET_ConnectionBroken));
903 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN);
907 GNUNET_assert (NULL == GCC_send_prebuilt_message (&msg.header, 0, 0, c, fwd,
908 GNUNET_YES, NULL, NULL));
913 * Send a notification that a connection is broken, when a connection
914 * isn't even known to the local peer or soon to be destroyed.
916 * @param connection_id Connection ID.
917 * @param id1 Peer that has disconnected, probably local peer.
918 * @param id2 Peer that has disconnected can be NULL if unknown.
919 * @param peer Peer to notify (neighbor who sent the connection).
922 send_broken_unknown (const struct GNUNET_CADET_Hash *connection_id,
923 const struct GNUNET_PeerIdentity *id1,
924 const struct GNUNET_PeerIdentity *id2,
925 const struct GNUNET_PeerIdentity *peer_id)
927 struct GNUNET_CADET_ConnectionBroken *msg;
928 struct CadetPeer *neighbor;
930 LOG (GNUNET_ERROR_TYPE_INFO, "---> BROKEN on unknown connection %s\n",
931 GNUNET_h2s (GC_h2hc (connection_id)));
933 msg = GNUNET_new (struct GNUNET_CADET_ConnectionBroken);
934 msg->header.size = htons (sizeof (struct GNUNET_CADET_ConnectionBroken));
935 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN);
936 msg->cid = *connection_id;
941 memset (&msg->peer2, 0, sizeof (msg->peer2));
942 neighbor = GCP_get (peer_id);
943 GCP_queue_add (neighbor, msg, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN,
944 0, 2, sizeof (struct GNUNET_CADET_ConnectionBroken),
945 NULL, GNUNET_SYSERR, /* connection, fwd */
946 NULL, NULL); /* continuation */
951 * Send keepalive packets for a connection.
953 * @param c Connection to keep alive..
954 * @param fwd Is this a FWD keepalive? (owner -> dest).
957 send_connection_keepalive (struct CadetConnection *c, int fwd)
959 struct GNUNET_MessageHeader msg;
960 struct CadetFlowControl *fc;
962 LOG (GNUNET_ERROR_TYPE_INFO, "keepalive %s for connection %s\n",
963 GC_f2s (fwd), GCC_2s (c));
965 fc = fwd ? &c->fwd_fc : &c->bck_fc;
968 LOG (GNUNET_ERROR_TYPE_INFO, "not sending keepalive, traffic in queue\n");
972 GNUNET_STATISTICS_update (stats, "# keepalives sent", 1, GNUNET_NO);
974 GNUNET_assert (NULL != c->t);
975 msg.size = htons (sizeof (msg));
976 msg.type = htons (GNUNET_MESSAGE_TYPE_CADET_KEEPALIVE);
978 GNUNET_assert (NULL ==
979 GCT_send_prebuilt_message (&msg, c->t, c,
980 GNUNET_NO, NULL, NULL));
985 * Send CONNECTION_{CREATE/ACK} packets for a connection.
987 * @param c Connection for which to send the message.
988 * @param fwd If #GNUNET_YES, send CREATE, otherwise send ACK.
991 connection_recreate (struct CadetConnection *c, int fwd)
993 LOG (GNUNET_ERROR_TYPE_DEBUG, "sending connection recreate\n");
997 send_connection_ack (c, GNUNET_NO);
1002 * Generic connection timer management.
1003 * Depending on the role of the peer in the connection will send the
1004 * appropriate message (build or keepalive)
1006 * @param c Conncetion to maintain.
1007 * @param fwd Is FWD?
1010 connection_maintain (struct CadetConnection *c, int fwd)
1012 if (GNUNET_NO != c->destroy)
1014 LOG (GNUNET_ERROR_TYPE_INFO, "not sending keepalive, being destroyed\n");
1021 GCC_debug (c, GNUNET_ERROR_TYPE_ERROR);
1025 if (CADET_TUNNEL_SEARCHING == GCT_get_cstate (c->t))
1027 /* If status is SEARCHING, why is there a connection? Should be WAITING */
1029 GCT_debug (c->t, GNUNET_ERROR_TYPE_ERROR);
1030 LOG (GNUNET_ERROR_TYPE_INFO, "not sending keepalive, tunnel SEARCHING\n");
1031 schedule_next_keepalive (c, fwd);
1036 case CADET_CONNECTION_NEW:
1039 case CADET_CONNECTION_SENT:
1040 connection_recreate (c, fwd);
1042 case CADET_CONNECTION_READY:
1043 send_connection_keepalive (c, fwd);
1053 * Keep the connection alive.
1055 * @param c Connection to keep alive.
1056 * @param fwd Direction.
1057 * @param shutdown Are we shutting down? (Don't send traffic)
1058 * Non-zero value for true, not necessarily GNUNET_YES.
1061 connection_keepalive (struct CadetConnection *c, int fwd, int shutdown)
1063 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s keepalive for %s\n",
1064 GC_f2s (fwd), GCC_2s (c));
1067 c->fwd_maintenance_task = NULL;
1069 c->bck_maintenance_task = NULL;
1071 if (GNUNET_NO != shutdown)
1074 connection_maintain (c, fwd);
1076 /* Next execution will be scheduled by message_sent or _maintain*/
1081 * Keep the connection alive in the FWD direction.
1083 * @param cls Closure (connection to keepalive).
1084 * @param tc TaskContext.
1087 connection_fwd_keepalive (void *cls,
1088 const struct GNUNET_SCHEDULER_TaskContext *tc)
1090 connection_keepalive ((struct CadetConnection *) cls,
1092 tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN);
1097 * Keep the connection alive in the BCK direction.
1099 * @param cls Closure (connection to keepalive).
1100 * @param tc TaskContext.
1103 connection_bck_keepalive (void *cls,
1104 const struct GNUNET_SCHEDULER_TaskContext *tc)
1106 connection_keepalive ((struct CadetConnection *) cls,
1108 tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN);
1113 * Schedule next keepalive task, taking in consideration
1114 * the connection state and number of retries.
1116 * If the peer is not the origin, do nothing.
1118 * @param c Connection for which to schedule the next keepalive.
1119 * @param fwd Direction for the next keepalive.
1122 schedule_next_keepalive (struct CadetConnection *c, int fwd)
1124 struct GNUNET_TIME_Relative delay;
1125 struct GNUNET_SCHEDULER_Task * *task_id;
1126 GNUNET_SCHEDULER_TaskCallback keepalive_task;
1128 if (GNUNET_NO == GCC_is_origin (c, fwd))
1131 /* Calculate delay to use, depending on the state of the connection */
1132 if (CADET_CONNECTION_READY == c->state)
1134 delay = refresh_connection_time;
1138 if (1 > c->create_retry)
1139 c->create_retry = 1;
1140 delay = GNUNET_TIME_relative_multiply (create_connection_time,
1142 if (c->create_retry < 64)
1143 c->create_retry *= 2;
1146 /* Select direction-dependent parameters */
1147 if (GNUNET_YES == fwd)
1149 task_id = &c->fwd_maintenance_task;
1150 keepalive_task = &connection_fwd_keepalive;
1154 task_id = &c->bck_maintenance_task;
1155 keepalive_task = &connection_bck_keepalive;
1158 /* Check that no one scheduled it before us */
1159 if (NULL != *task_id)
1161 /* No need for a _break. It can happen for instance when sending a SYNACK
1162 * for a duplicate SYN: the first SYNACK scheduled the task. */
1163 GNUNET_SCHEDULER_cancel (*task_id);
1166 /* Schedule the task */
1167 *task_id = GNUNET_SCHEDULER_add_delayed (delay, keepalive_task, c);
1168 LOG (GNUNET_ERROR_TYPE_DEBUG, "next keepalive in %s\n",
1169 GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES));
1174 * @brief Re-initiate traffic on this connection if necessary.
1176 * Check if there is traffic queued towards this peer
1177 * and the core transmit handle is NULL (traffic was stalled).
1178 * If so, call core tmt rdy.
1180 * @param c Connection on which initiate traffic.
1181 * @param fwd Is this about fwd traffic?
1184 connection_unlock_queue (struct CadetConnection *c, int fwd)
1186 struct CadetPeer *peer;
1188 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection_unlock_queue %s on %s\n",
1189 GC_f2s (fwd), GCC_2s (c));
1191 if (GCC_is_terminal (c, fwd))
1193 LOG (GNUNET_ERROR_TYPE_DEBUG, " is terminal, can unlock!\n");
1197 peer = get_hop (c, fwd);
1198 GCP_queue_unlock (peer, c);
1203 * Cancel all transmissions that belong to a certain connection.
1205 * If the connection is scheduled for destruction and no more messages are left,
1206 * the connection will be destroyed by the continuation call.
1208 * @param c Connection which to cancel. Might be destroyed during this call.
1209 * @param fwd Cancel fwd traffic?
1212 connection_cancel_queues (struct CadetConnection *c, int fwd)
1214 struct CadetFlowControl *fc;
1215 struct CadetPeer *peer;
1217 LOG (GNUNET_ERROR_TYPE_DEBUG,
1218 " *** Cancel %s queues for connection %s\n",
1219 GC_f2s (fwd), GCC_2s (c));
1226 fc = fwd ? &c->fwd_fc : &c->bck_fc;
1227 if (NULL != fc->poll_task)
1229 GNUNET_SCHEDULER_cancel (fc->poll_task);
1230 fc->poll_task = NULL;
1231 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** Cancel POLL in ccq for fc %p\n", fc);
1233 peer = get_hop (c, fwd);
1234 GCP_queue_cancel (peer, c);
1239 * Function called if a connection has been stalled for a while,
1240 * possibly due to a missed ACK. Poll the neighbor about its ACK status.
1242 * @param cls Closure (poll ctx).
1243 * @param tc TaskContext.
1246 connection_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
1250 * Callback called when a queued POLL message is sent.
1252 * @param cls Closure (FC).
1253 * @param c Connection this message was on.
1254 * @param q Queue handler this call invalidates.
1255 * @param type Type of message sent.
1256 * @param fwd Was this a FWD going message?
1257 * @param size Size of the message.
1260 poll_sent (void *cls,
1261 struct CadetConnection *c,
1262 struct CadetConnectionQueue *q,
1263 uint16_t type, int fwd, size_t size)
1265 struct CadetFlowControl *fc = cls;
1267 if (2 == c->destroy)
1269 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL canceled on shutdown\n");
1272 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL sent for , scheduling new one!\n");
1273 fc->poll_msg = NULL;
1274 fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
1275 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
1276 &connection_poll, fc);
1277 LOG (GNUNET_ERROR_TYPE_DEBUG, " task %u\n", fc->poll_task);
1282 * Function called if a connection has been stalled for a while,
1283 * possibly due to a missed ACK. Poll the neighbor about its ACK status.
1285 * @param cls Closure (poll ctx).
1286 * @param tc TaskContext.
1289 connection_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1291 struct CadetFlowControl *fc = cls;
1292 struct GNUNET_CADET_Poll msg;
1293 struct CadetConnection *c;
1295 fc->poll_task = NULL;
1296 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1302 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** Polling connection %s %s\n",
1303 GCC_2s (c), fc == &c->fwd_fc ? "FWD" : "BCK");
1305 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_POLL);
1306 msg.header.size = htons (sizeof (msg));
1307 msg.pid = htonl (fc->last_pid_sent);
1308 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** last pid sent: %u!\n", fc->last_pid_sent);
1310 GCC_send_prebuilt_message (&msg.header, 0, fc->last_pid_sent, c,
1311 fc == &c->fwd_fc, GNUNET_YES, &poll_sent, fc);
1312 GNUNET_assert (NULL != fc->poll_msg);
1317 * Resend all queued messages for a connection on other connections of the
1318 * same tunnel, if possible. The connection WILL BE DESTROYED by this function.
1320 * @param c Connection whose messages to resend.
1321 * @param fwd Resend fwd messages?
1324 resend_messages_and_destroy (struct CadetConnection *c, int fwd)
1326 struct GNUNET_MessageHeader *out_msg;
1327 struct CadetTunnel *t = c->t;
1328 struct CadetPeer *neighbor;
1329 unsigned int pending;
1332 c->state = CADET_CONNECTION_DESTROYED;
1333 c->destroy = GNUNET_YES;
1335 destroyed = GNUNET_NO;
1336 neighbor = get_hop (c, fwd);
1337 pending = c->pending_messages;
1339 while (NULL != (out_msg = GCP_connection_pop (neighbor, c, &destroyed)))
1342 GCT_resend_message (out_msg, t);
1343 GNUNET_free (out_msg);
1346 /* All pending messages should have been popped,
1347 * and the connection destroyed by the continuation.
1349 if (GNUNET_YES != destroyed)
1354 GCC_debug (c, GNUNET_ERROR_TYPE_ERROR);
1355 if (NULL != t) GCT_debug (t, GNUNET_ERROR_TYPE_ERROR);
1363 * Timeout function due to lack of keepalive/traffic from the owner.
1364 * Destroys connection if called.
1366 * @param cls Closure (connection to destroy).
1367 * @param tc TaskContext.
1370 connection_fwd_timeout (void *cls,
1371 const struct GNUNET_SCHEDULER_TaskContext *tc)
1373 struct CadetConnection *c = cls;
1375 c->fwd_maintenance_task = NULL;
1376 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1379 LOG (GNUNET_ERROR_TYPE_INFO, "Connection %s FWD timed out. Destroying.\n",
1381 GCC_debug (c, GNUNET_ERROR_TYPE_DEBUG);
1383 if (GCC_is_origin (c, GNUNET_YES)) /* If local, leave. */
1389 /* If dest, salvage queued traffic. */
1390 if (GCC_is_origin (c, GNUNET_NO) && 0 < c->bck_fc.queue_n)
1392 send_broken_unknown (&c->id, &my_full_id, NULL,
1393 GCP_get_id( get_prev_hop (c)));
1394 resend_messages_and_destroy (c, GNUNET_NO);
1403 * Timeout function due to lack of keepalive/traffic from the destination.
1404 * Destroys connection if called.
1406 * FIXME refactor and merge with connection_fwd_timeout.
1408 * @param cls Closure (connection to destroy).
1409 * @param tc TaskContext
1412 connection_bck_timeout (void *cls,
1413 const struct GNUNET_SCHEDULER_TaskContext *tc)
1415 struct CadetConnection *c = cls;
1417 c->bck_maintenance_task = NULL;
1418 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1421 LOG (GNUNET_ERROR_TYPE_INFO, "Connection %s BCK timed out. Destroying.\n",
1424 if (GCC_is_origin (c, GNUNET_NO)) /* If local, leave. */
1430 /* If dest, salvage queued traffic. */
1431 if (GCC_is_origin (c, GNUNET_YES) && 0 < c->fwd_fc.queue_n)
1433 send_broken_unknown (&c->id, &my_full_id, NULL,
1434 GCP_get_id( get_next_hop (c)));
1435 resend_messages_and_destroy (c, GNUNET_YES);
1444 * Resets the connection timeout task, some other message has done the
1446 * - For the first peer on the direction this means to send
1447 * a keepalive or a path confirmation message (either create or ACK).
1448 * - For all other peers, this means to destroy the connection,
1449 * due to lack of activity.
1450 * Starts the timeout if no timeout was running (connection just created).
1452 * @param c Connection whose timeout to reset.
1453 * @param fwd Is this forward?
1455 * TODO use heap to improve efficiency of scheduler.
1458 connection_reset_timeout (struct CadetConnection *c, int fwd)
1460 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connection %s reset timeout\n", GC_f2s (fwd));
1462 if (GCC_is_origin (c, fwd)) /* Startpoint */
1464 schedule_next_keepalive (c, fwd);
1466 else /* Relay, endpoint. */
1468 struct GNUNET_TIME_Relative delay;
1469 struct GNUNET_SCHEDULER_Task * *ti;
1470 GNUNET_SCHEDULER_TaskCallback f;
1472 ti = fwd ? &c->fwd_maintenance_task : &c->bck_maintenance_task;
1475 GNUNET_SCHEDULER_cancel (*ti);
1476 delay = GNUNET_TIME_relative_multiply (refresh_connection_time, 4);
1477 LOG (GNUNET_ERROR_TYPE_DEBUG, " timing out in %s\n",
1478 GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_NO));
1479 f = fwd ? &connection_fwd_timeout : &connection_bck_timeout;
1480 *ti = GNUNET_SCHEDULER_add_delayed (delay, f, c);
1486 * Add the connection to the list of both neighbors.
1488 * @param c Connection.
1490 * @return #GNUNET_OK if everything went fine
1491 * #GNUNET_SYSERR if the was an error and @c c is malformed.
1494 register_neighbors (struct CadetConnection *c)
1496 struct CadetPeer *next_peer;
1497 struct CadetPeer *prev_peer;
1499 next_peer = get_next_hop (c);
1500 prev_peer = get_prev_hop (c);
1502 LOG (GNUNET_ERROR_TYPE_DEBUG, "register neighbors for connection %s\n",
1504 path_debug (c->path);
1505 LOG (GNUNET_ERROR_TYPE_DEBUG, "own pos %u\n", c->own_pos);
1506 LOG (GNUNET_ERROR_TYPE_DEBUG, "putting connection %s to next peer %p\n",
1507 GCC_2s (c), next_peer);
1508 LOG (GNUNET_ERROR_TYPE_DEBUG, "next peer %p %s\n", next_peer, GCP_2s (next_peer));
1509 LOG (GNUNET_ERROR_TYPE_DEBUG, "putting connection %s to prev peer %p\n",
1510 GCC_2s (c), prev_peer);
1511 LOG (GNUNET_ERROR_TYPE_DEBUG, "prev peer %p %s\n", prev_peer, GCP_2s (prev_peer));
1513 if (GNUNET_NO == GCP_is_neighbor (next_peer)
1514 || GNUNET_NO == GCP_is_neighbor (prev_peer))
1516 if (GCC_is_origin (c, GNUNET_YES))
1517 GNUNET_STATISTICS_update (stats, "# local bad paths", 1, GNUNET_NO);
1518 GNUNET_STATISTICS_update (stats, "# bad paths", 1, GNUNET_NO);
1520 LOG (GNUNET_ERROR_TYPE_DEBUG, " register neighbors failed\n");
1521 LOG (GNUNET_ERROR_TYPE_DEBUG, " prev: %s, neighbor?: %d\n",
1522 GCP_2s (prev_peer), GCP_is_neighbor (prev_peer));
1523 LOG (GNUNET_ERROR_TYPE_DEBUG, " next: %s, neighbor?: %d\n",
1524 GCP_2s (next_peer), GCP_is_neighbor (next_peer));
1525 return GNUNET_SYSERR;
1528 GCP_add_connection (next_peer, c);
1529 GCP_add_connection (prev_peer, c);
1536 * Remove the connection from the list of both neighbors.
1538 * @param c Connection.
1541 unregister_neighbors (struct CadetConnection *c)
1543 struct CadetPeer *peer;
1545 peer = get_next_hop (c);
1546 if (GNUNET_OK != GCP_remove_connection (peer, c))
1548 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate: %u\n", c->state);
1549 if (NULL != c->t) GCT_debug (c->t, GNUNET_ERROR_TYPE_DEBUG);
1552 peer = get_prev_hop (c);
1553 if (GNUNET_OK != GCP_remove_connection (peer, c))
1555 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate: %u\n", c->state);
1556 if (NULL != c->t) GCT_debug (c->t, GNUNET_ERROR_TYPE_DEBUG);
1562 * Bind the connection to the peer and the tunnel to that peer.
1564 * If the peer has no tunnel, create one. Update tunnel and connection
1565 * data structres to reflect new status.
1567 * @param c Connection.
1571 add_to_peer (struct CadetConnection *c, struct CadetPeer *peer)
1573 GCP_add_tunnel (peer);
1574 c->t = GCP_get_tunnel (peer);
1575 GCT_add_connection (c->t, c);
1581 * Iterator to compare each connection's path with the path of a new connection.
1583 * If the connection conincides, the c member of path is set to the connection
1584 * and the destroy flag of the connection is set.
1586 * @param cls Closure (new path).
1587 * @param c Connection in the tunnel to check.
1590 check_path (void *cls, struct CadetConnection *c)
1592 struct CadetConnection *new_conn = cls;
1593 struct CadetPeerPath *path = new_conn->path;
1595 LOG (GNUNET_ERROR_TYPE_DEBUG, " checking %s (%p), length %u\n",
1596 GCC_2s (c), c, c->path->length);
1599 && c->destroy == GNUNET_NO
1600 && c->state != CADET_CONNECTION_BROKEN
1601 && c->state != CADET_CONNECTION_DESTROYED
1602 && path_equivalent (path, c->path))
1604 new_conn->destroy = GNUNET_YES;
1605 new_conn->path->c = c;
1606 LOG (GNUNET_ERROR_TYPE_DEBUG, " MATCH!\n");
1611 * Finds out if this path is already being used by and existing connection.
1613 * Checks the tunnel towards the first peer in the path to see if it contains
1614 * any connection with the same path.
1616 * If the existing connection is ready, it is kept.
1617 * Otherwise if the sender has a smaller ID that ours, we accept it (and
1618 * the peer will eventually reject our attempt).
1620 * @param path Path to check.
1622 * @return GNUNET_YES if the tunnel has a connection with the same path,
1623 * GNUNET_NO otherwise.
1626 does_connection_exist (struct CadetConnection *conn)
1628 struct CadetPeer *p;
1629 struct CadetTunnel *t;
1630 struct CadetConnection *c;
1632 p = GCP_get_short (conn->path->peers[0]);
1633 t = GCP_get_tunnel (p);
1637 LOG (GNUNET_ERROR_TYPE_DEBUG, "Checking for duplicates\n");
1639 GCT_iterate_connections (t, &check_path, conn);
1641 if (GNUNET_YES == conn->destroy)
1644 conn->destroy = GNUNET_NO;
1645 conn->path->c = conn;
1646 LOG (GNUNET_ERROR_TYPE_DEBUG, " found duplicate of %s\n", GCC_2s (conn));
1647 LOG (GNUNET_ERROR_TYPE_DEBUG, " duplicate: %s\n", GCC_2s (c));
1648 GCC_debug (c, GNUNET_ERROR_TYPE_DEBUG);
1649 if (CADET_CONNECTION_READY == c->state)
1651 /* The other peer confirmed this connection,
1652 * they should not try to duplicate it. */
1653 GNUNET_break_op (0);
1657 if (GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, GCP_get_id (p)) > 0)
1659 struct CadetPeer *neighbor;
1661 LOG (GNUNET_ERROR_TYPE_DEBUG, " duplicate allowed (killing old)\n");
1662 if (GCC_is_origin (c, GNUNET_YES))
1663 neighbor = get_next_hop (c);
1665 neighbor = get_prev_hop (c);
1666 send_broken_unknown (&c->id, &my_full_id, NULL,
1667 GCP_get_id (neighbor));
1676 LOG (GNUNET_ERROR_TYPE_DEBUG, " %s has no duplicates\n", GCC_2s (conn));
1683 * Log receipt of message on stderr (INFO level).
1685 * @param message Message received.
1686 * @param peer Peer who sent the message.
1687 * @param hash Connection ID.
1690 log_message (const struct GNUNET_MessageHeader *message,
1691 const struct GNUNET_PeerIdentity *peer,
1692 const struct GNUNET_CADET_Hash *hash)
1696 size = ntohs (message->size);
1697 LOG (GNUNET_ERROR_TYPE_INFO, "\n");
1698 LOG (GNUNET_ERROR_TYPE_INFO, "\n");
1699 LOG (GNUNET_ERROR_TYPE_INFO, "<-- %s on connection %s from %s, %6u bytes\n",
1700 GC_m2s (ntohs (message->type)), GNUNET_h2s (GC_h2hc (hash)),
1701 GNUNET_i2s (peer), (unsigned int) size);
1704 /******************************************************************************/
1705 /******************************** API ***********************************/
1706 /******************************************************************************/
1709 * Core handler for connection creation.
1711 * @param cls Closure (unused).
1712 * @param peer Sender (neighbor).
1713 * @param message Message.
1715 * @return GNUNET_OK to keep the connection open,
1716 * GNUNET_SYSERR to close it (signal serious error)
1719 GCC_handle_create (void *cls, const struct GNUNET_PeerIdentity *peer,
1720 const struct GNUNET_MessageHeader *message)
1722 struct GNUNET_CADET_ConnectionCreate *msg;
1723 struct GNUNET_PeerIdentity *id;
1724 struct GNUNET_CADET_Hash *cid;
1725 struct CadetPeerPath *path;
1726 struct CadetPeer *dest_peer;
1727 struct CadetPeer *orig_peer;
1728 struct CadetConnection *c;
1729 unsigned int own_pos;
1733 size = ntohs (message->size);
1734 if (size < sizeof (struct GNUNET_CADET_ConnectionCreate))
1736 GNUNET_break_op (0);
1740 /* Calculate hops */
1741 size -= sizeof (struct GNUNET_CADET_ConnectionCreate);
1742 if (size % sizeof (struct GNUNET_PeerIdentity))
1744 GNUNET_break_op (0);
1747 if (0 != size % sizeof (struct GNUNET_PeerIdentity))
1749 GNUNET_break_op (0);
1752 size /= sizeof (struct GNUNET_PeerIdentity);
1755 GNUNET_break_op (0);
1758 LOG (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
1760 /* Get parameters */
1761 msg = (struct GNUNET_CADET_ConnectionCreate *) message;
1763 log_message (message, peer, cid);
1764 id = (struct GNUNET_PeerIdentity *) &msg[1];
1765 LOG (GNUNET_ERROR_TYPE_DEBUG, " origin: %s\n", GNUNET_i2s (id));
1767 /* Create connection */
1768 c = connection_get (cid);
1771 path = path_build_from_peer_ids ((struct GNUNET_PeerIdentity *) &msg[1],
1772 size, myid, &own_pos);
1778 GNUNET_break_op (0);
1779 path_destroy (path);
1783 LOG (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
1784 LOG (GNUNET_ERROR_TYPE_DEBUG, " Creating connection\n");
1785 c = GCC_new (cid, NULL, path, own_pos);
1788 if (path->length - 1 == own_pos)
1790 /* If we are destination, why did the creation fail? */
1792 path_destroy (path);
1795 send_broken_unknown (cid, &my_full_id,
1796 GNUNET_PEER_resolve2 (path->peers[own_pos + 1]),
1798 path_destroy (path);
1801 GCP_add_path_to_all (path, GNUNET_NO);
1802 connection_reset_timeout (c, GNUNET_YES);
1806 path = path_duplicate (c->path);
1808 if (CADET_CONNECTION_NEW == c->state)
1809 connection_change_state (c, CADET_CONNECTION_SENT);
1811 /* Remember peers */
1812 dest_peer = GCP_get (&id[size - 1]);
1813 orig_peer = GCP_get (&id[0]);
1815 /* Is it a connection to us? */
1816 if (c->own_pos == path->length - 1)
1818 LOG (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
1819 GCP_add_path_to_origin (orig_peer, path_duplicate (path), GNUNET_YES);
1821 add_to_peer (c, orig_peer);
1822 if (GNUNET_YES == does_connection_exist (c))
1824 path_destroy (path);
1826 // FIXME use explicit duplicate
1827 send_broken_unknown (cid, &my_full_id, NULL, peer);
1832 if (CADET_TUNNEL_NEW == GCT_get_cstate (c->t))
1833 GCT_change_cstate (c->t, CADET_TUNNEL_WAITING);
1835 send_connection_ack (c, GNUNET_NO);
1836 if (CADET_CONNECTION_SENT == c->state)
1837 connection_change_state (c, CADET_CONNECTION_ACK);
1841 /* It's for somebody else! Retransmit. */
1842 LOG (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
1843 GCP_add_path (dest_peer, path_duplicate (path), GNUNET_NO);
1844 GCP_add_path_to_origin (orig_peer, path_duplicate (path), GNUNET_NO);
1845 GNUNET_assert (NULL == GCC_send_prebuilt_message (message, 0, 0, c,
1846 GNUNET_YES, GNUNET_YES,
1849 path_destroy (path);
1855 * Core handler for path confirmations.
1857 * @param cls closure
1858 * @param message message
1859 * @param peer peer identity this notification is about
1861 * @return GNUNET_OK to keep the connection open,
1862 * GNUNET_SYSERR to close it (signal serious error)
1865 GCC_handle_confirm (void *cls, const struct GNUNET_PeerIdentity *peer,
1866 const struct GNUNET_MessageHeader *message)
1868 struct GNUNET_CADET_ConnectionACK *msg;
1869 struct CadetConnection *c;
1870 struct CadetPeerPath *p;
1871 struct CadetPeer *pi;
1872 enum CadetConnectionState oldstate;
1875 msg = (struct GNUNET_CADET_ConnectionACK *) message;
1876 log_message (message, peer, &msg->cid);
1877 c = connection_get (&msg->cid);
1880 GNUNET_STATISTICS_update (stats, "# control on unknown connection",
1882 LOG (GNUNET_ERROR_TYPE_DEBUG, " don't know the connection!\n");
1883 send_broken_unknown (&msg->cid, &my_full_id, NULL, peer);
1887 if (GNUNET_NO != c->destroy)
1889 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection being destroyed\n");
1893 oldstate = c->state;
1894 LOG (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n", GNUNET_i2s (peer));
1895 pi = GCP_get (peer);
1896 if (get_next_hop (c) == pi)
1898 LOG (GNUNET_ERROR_TYPE_DEBUG, " SYNACK\n");
1900 if (CADET_CONNECTION_SENT == oldstate)
1901 connection_change_state (c, CADET_CONNECTION_ACK);
1903 else if (get_prev_hop (c) == pi)
1905 LOG (GNUNET_ERROR_TYPE_DEBUG, " FINAL ACK\n");
1907 connection_change_state (c, CADET_CONNECTION_READY);
1911 GNUNET_break_op (0);
1915 connection_reset_timeout (c, fwd);
1917 /* Add path to peers? */
1921 GCP_add_path_to_all (p, GNUNET_YES);
1928 /* Message for us as creator? */
1929 if (GCC_is_origin (c, GNUNET_YES))
1931 if (GNUNET_NO != fwd)
1933 GNUNET_break_op (0);
1936 LOG (GNUNET_ERROR_TYPE_DEBUG, " Connection (SYN)ACK for us!\n");
1938 /* If just created, cancel the short timeout and start a long one */
1939 if (CADET_CONNECTION_SENT == oldstate)
1940 connection_reset_timeout (c, GNUNET_YES);
1942 /* Change connection state */
1943 connection_change_state (c, CADET_CONNECTION_READY);
1944 send_connection_ack (c, GNUNET_YES);
1946 /* Change tunnel state, trigger KX */
1947 if (CADET_TUNNEL_WAITING == GCT_get_cstate (c->t))
1948 GCT_change_cstate (c->t, CADET_TUNNEL_READY);
1953 /* Message for us as destination? */
1954 if (GCC_is_terminal (c, GNUNET_YES))
1956 if (GNUNET_YES != fwd)
1958 GNUNET_break_op (0);
1961 LOG (GNUNET_ERROR_TYPE_DEBUG, " Connection ACK for us!\n");
1963 /* If just created, cancel the short timeout and start a long one */
1964 if (CADET_CONNECTION_ACK == oldstate)
1965 connection_reset_timeout (c, GNUNET_NO);
1967 /* Change tunnel state */
1968 if (CADET_TUNNEL_WAITING == GCT_get_cstate (c->t))
1969 GCT_change_cstate (c->t, CADET_TUNNEL_READY);
1974 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
1975 GNUNET_assert (NULL == GCC_send_prebuilt_message (message, 0, 0, c, fwd,
1976 GNUNET_YES, NULL, NULL));
1982 * Core handler for notifications of broken connections.
1984 * @param cls Closure (unused).
1985 * @param id Peer identity of sending neighbor.
1986 * @param message Message.
1988 * @return GNUNET_OK to keep the connection open,
1989 * GNUNET_SYSERR to close it (signal serious error)
1992 GCC_handle_broken (void* cls,
1993 const struct GNUNET_PeerIdentity* id,
1994 const struct GNUNET_MessageHeader* message)
1996 struct GNUNET_CADET_ConnectionBroken *msg;
1997 struct CadetConnection *c;
1998 struct CadetTunnel *t;
2002 msg = (struct GNUNET_CADET_ConnectionBroken *) message;
2003 log_message (message, id, &msg->cid);
2004 LOG (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
2005 GNUNET_i2s (&msg->peer1));
2006 LOG (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
2007 GNUNET_i2s (&msg->peer2));
2008 c = connection_get (&msg->cid);
2011 LOG (GNUNET_ERROR_TYPE_DEBUG, " duplicate CONNECTION_BROKEN\n");
2017 fwd = is_fwd (c, id);
2018 c->destroy = GNUNET_YES;
2019 if (GCC_is_terminal (c, fwd))
2021 struct CadetPeer *endpoint;
2025 /* A terminal connection should not have 't' set to NULL. */
2027 GCC_debug (c, GNUNET_ERROR_TYPE_ERROR);
2030 endpoint = GCP_get_short (c->path->peers[c->path->length - 1]);
2031 path_invalidate (c->path);
2032 GCP_notify_broken_link (endpoint, &msg->peer1, &msg->peer2);
2034 c->state = CADET_CONNECTION_BROKEN;
2035 GCT_remove_connection (t, c);
2038 pending = c->pending_messages;
2040 resend_messages_and_destroy (c, !fwd);
2046 GNUNET_assert (NULL == GCC_send_prebuilt_message (message, 0, 0, c, fwd,
2047 GNUNET_YES, NULL, NULL));
2048 connection_cancel_queues (c, !fwd);
2056 * Core handler for tunnel destruction
2058 * @param cls Closure (unused).
2059 * @param peer Peer identity of sending neighbor.
2060 * @param message Message.
2062 * @return GNUNET_OK to keep the connection open,
2063 * GNUNET_SYSERR to close it (signal serious error)
2066 GCC_handle_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
2067 const struct GNUNET_MessageHeader *message)
2069 struct GNUNET_CADET_ConnectionDestroy *msg;
2070 struct CadetConnection *c;
2073 msg = (struct GNUNET_CADET_ConnectionDestroy *) message;
2074 log_message (message, peer, &msg->cid);
2075 c = connection_get (&msg->cid);
2078 /* Probably already got the message from another path,
2079 * destroyed the tunnel and retransmitted to children.
2082 GNUNET_STATISTICS_update (stats, "# control on unknown connection",
2084 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection unknown: already destroyed?\n");
2087 fwd = is_fwd (c, peer);
2088 if (GNUNET_SYSERR == fwd)
2090 GNUNET_break_op (0); /* FIXME */
2093 if (GNUNET_NO == GCC_is_terminal (c, fwd))
2094 GNUNET_assert (NULL == GCC_send_prebuilt_message (message, 0, 0, c, fwd,
2095 GNUNET_YES, NULL, NULL));
2096 else if (0 == c->pending_messages)
2098 LOG (GNUNET_ERROR_TYPE_DEBUG, " directly destroying connection!\n");
2102 c->destroy = GNUNET_YES;
2103 c->state = CADET_CONNECTION_DESTROYED;
2106 GCT_remove_connection (c->t, c);
2115 * Check the message against internal state and test if it goes FWD or BCK.
2117 * Updates the PID, state and timeout values for the connection.
2119 * @param message Message to check. It must belong to an existing connection.
2120 * @param minimum_size The message cannot be smaller than this value.
2121 * @param cid Connection ID (even if @a c is NULL, the ID is still needed).
2122 * @param c Connection this message should belong. If NULL, check fails.
2123 * @param neighbor Neighbor that sent the message.
2126 check_message (const struct GNUNET_MessageHeader *message,
2127 size_t minimum_size,
2128 const struct GNUNET_CADET_Hash* cid,
2129 struct CadetConnection *c,
2130 const struct GNUNET_PeerIdentity *neighbor,
2133 GNUNET_PEER_Id neighbor_id;
2134 struct CadetFlowControl *fc;
2135 struct CadetPeer *hop;
2140 if (ntohs (message->size) < minimum_size)
2142 GNUNET_break_op (0);
2143 LOG (GNUNET_ERROR_TYPE_WARNING, "Size %u < %u\n",
2144 ntohs (message->size), minimum_size);
2145 return GNUNET_SYSERR;
2148 /* Check connection */
2151 GNUNET_STATISTICS_update (stats, "# unknown connection", 1, GNUNET_NO);
2152 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s on unknown connection %s\n",
2153 GC_m2s (ntohs (message->type)), GNUNET_h2s (GC_h2hc (cid)));
2154 send_broken_unknown (cid, &my_full_id, NULL, neighbor);
2155 return GNUNET_SYSERR;
2158 /* Check if origin is as expected */
2159 neighbor_id = GNUNET_PEER_search (neighbor);
2160 hop = get_prev_hop (c);
2161 if (neighbor_id == GCP_get_short_id (hop))
2167 hop = get_next_hop (c);
2168 if (neighbor_id == GCP_get_short_id (hop))
2174 /* Unexpected peer sending traffic on a connection. */
2175 GNUNET_break_op (0);
2176 return GNUNET_SYSERR;
2180 /* Check PID for payload messages */
2181 type = ntohs (message->type);
2182 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == type
2183 || GNUNET_MESSAGE_TYPE_CADET_AX == type)
2185 fc = fwd ? &c->bck_fc : &c->fwd_fc;
2186 LOG (GNUNET_ERROR_TYPE_DEBUG, " PID %u (expected %u - %u)\n",
2187 pid, fc->last_pid_recv + 1, fc->last_ack_sent);
2188 if (GC_is_pid_bigger (pid, fc->last_ack_sent))
2190 GNUNET_break_op (0);
2191 GNUNET_STATISTICS_update (stats, "# unsolicited message", 1, GNUNET_NO);
2192 LOG (GNUNET_ERROR_TYPE_WARNING, "Received PID %u, (prev %u), ACK %u\n",
2193 pid, fc->last_pid_recv, fc->last_ack_sent);
2194 return GNUNET_SYSERR;
2196 if (GC_is_pid_bigger (pid, fc->last_pid_recv))
2200 delta = pid - fc->last_pid_recv;
2201 fc->last_pid_recv = pid;
2202 fc->recv_bitmap <<= delta;
2203 fc->recv_bitmap |= 1;
2207 GNUNET_STATISTICS_update (stats, "# out of order PID", 1, GNUNET_NO);
2208 if (GNUNET_NO == is_ooo_ok (fc->last_pid_recv, pid, fc->recv_bitmap))
2210 LOG (GNUNET_ERROR_TYPE_WARNING, "PID %u unexpected (%u+), dropping!\n",
2211 pid, fc->last_pid_recv - 31);
2212 return GNUNET_SYSERR;
2214 fc->recv_bitmap |= get_recv_bitmask (fc->last_pid_recv, pid);
2218 /* Count as connection confirmation. */
2219 if (CADET_CONNECTION_SENT == c->state || CADET_CONNECTION_ACK == c->state)
2221 connection_change_state (c, CADET_CONNECTION_READY);
2224 if (CADET_TUNNEL_WAITING == GCT_get_cstate (c->t))
2225 GCT_change_cstate (c->t, CADET_TUNNEL_READY);
2228 connection_reset_timeout (c, fwd);
2235 * Generic handler for cadet network encrypted traffic.
2237 * @param peer Peer identity this notification is about.
2238 * @param msg Encrypted message.
2240 * @return GNUNET_OK to keep the connection open,
2241 * GNUNET_SYSERR to close it (signal serious error)
2244 handle_cadet_encrypted (const struct GNUNET_PeerIdentity *peer,
2245 const struct GNUNET_MessageHeader *message)
2247 const struct GNUNET_CADET_Encrypted *otr_msg;
2248 const struct GNUNET_CADET_AX *ax_msg;
2249 const struct GNUNET_CADET_Hash* cid;
2250 struct CadetConnection *c;
2251 size_t minumum_size;
2257 if (GNUNET_MESSAGE_TYPE_CADET_AX == ntohs (message->type))
2259 overhead = sizeof (struct GNUNET_CADET_AX);
2260 ax_msg = (const struct GNUNET_CADET_AX *) message;
2262 pid = ntohl (ax_msg->pid);
2267 overhead = sizeof (struct GNUNET_CADET_Encrypted);
2268 otr_msg = (const struct GNUNET_CADET_Encrypted *) message;
2269 cid = &otr_msg->cid;
2270 pid = ntohl (otr_msg->pid);
2273 log_message (message, peer, cid);
2275 minumum_size = sizeof (struct GNUNET_MessageHeader) + overhead;
2276 c = connection_get (cid);
2277 fwd = check_message (message, minumum_size, cid, c, peer, pid);
2279 /* If something went wrong, discard message. */
2280 if (GNUNET_SYSERR == fwd)
2283 /* Is this message for us? */
2284 if (GCC_is_terminal (c, fwd))
2286 GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO);
2290 GNUNET_break (GNUNET_NO != c->destroy);
2293 GCT_handle_encrypted (c->t, message);
2294 GCC_send_ack (c, fwd, GNUNET_NO);
2298 /* Message not for us: forward to next hop */
2299 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
2300 if (NULL != otr_msg) /* only otr has ttl */
2302 ttl = ntohl (otr_msg->ttl);
2303 LOG (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
2306 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
2307 LOG (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
2308 GCC_send_ack (c, fwd, GNUNET_NO);
2313 GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
2314 GNUNET_assert (NULL == GCC_send_prebuilt_message (message, 0, 0, c, fwd,
2315 GNUNET_NO, NULL, NULL));
2321 * Generic handler for cadet network encrypted traffic.
2323 * @param peer Peer identity this notification is about.
2324 * @param msg Encrypted message.
2326 * @return GNUNET_OK to keep the connection open,
2327 * GNUNET_SYSERR to close it (signal serious error)
2330 handle_cadet_kx (const struct GNUNET_PeerIdentity *peer,
2331 const struct GNUNET_CADET_KX *msg)
2333 const struct GNUNET_CADET_Hash* cid;
2334 struct CadetConnection *c;
2335 size_t expected_size;
2339 log_message (&msg->header, peer, cid);
2341 expected_size = sizeof (struct GNUNET_CADET_KX)
2342 + sizeof (struct GNUNET_MessageHeader);
2343 c = connection_get (cid);
2344 fwd = check_message (&msg->header, expected_size, cid, c, peer, 0);
2346 /* If something went wrong, discard message. */
2347 if (GNUNET_SYSERR == fwd)
2350 /* Is this message for us? */
2351 if (GCC_is_terminal (c, fwd))
2353 LOG (GNUNET_ERROR_TYPE_DEBUG, " message for us!\n");
2354 GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO);
2360 GCT_handle_kx (c->t, &msg[1].header);
2364 /* Message not for us: forward to next hop */
2365 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
2366 GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
2367 GNUNET_assert (NULL == GCC_send_prebuilt_message (&msg->header, 0, 0, c, fwd,
2368 GNUNET_NO, NULL, NULL));
2375 * Core handler for key exchange traffic (ephemeral key, ping, pong).
2377 * @param cls Closure (unused).
2378 * @param message Message received.
2379 * @param peer Peer who sent the message.
2381 * @return GNUNET_OK to keep the connection open,
2382 * GNUNET_SYSERR to close it (signal serious error)
2385 GCC_handle_kx (void *cls, const struct GNUNET_PeerIdentity *peer,
2386 const struct GNUNET_MessageHeader *message)
2388 return handle_cadet_kx (peer, (struct GNUNET_CADET_KX *) message);
2393 * Core handler for encrypted cadet network traffic (channel mgmt, data).
2395 * @param cls Closure (unused).
2396 * @param message Message received.
2397 * @param peer Peer who sent the message.
2399 * @return GNUNET_OK to keep the connection open,
2400 * GNUNET_SYSERR to close it (signal serious error)
2403 GCC_handle_encrypted (void *cls, const struct GNUNET_PeerIdentity *peer,
2404 const struct GNUNET_MessageHeader *message)
2406 return handle_cadet_encrypted (peer, message);
2411 * Core handler for cadet network traffic point-to-point acks.
2413 * @param cls closure
2414 * @param message message
2415 * @param peer peer identity this notification is about
2417 * @return GNUNET_OK to keep the connection open,
2418 * GNUNET_SYSERR to close it (signal serious error)
2421 GCC_handle_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
2422 const struct GNUNET_MessageHeader *message)
2424 struct GNUNET_CADET_ACK *msg;
2425 struct CadetConnection *c;
2426 struct CadetFlowControl *fc;
2431 msg = (struct GNUNET_CADET_ACK *) message;
2432 log_message (message, peer, &msg->cid);
2433 c = connection_get (&msg->cid);
2436 GNUNET_STATISTICS_update (stats, "# ack on unknown connection", 1,
2438 send_broken_unknown (&msg->cid, &my_full_id, NULL, peer);
2442 /* Is this a forward or backward ACK? */
2443 id = GNUNET_PEER_search (peer);
2444 if (GCP_get_short_id (get_next_hop (c)) == id)
2449 else if (GCP_get_short_id (get_prev_hop (c)) == id)
2456 GNUNET_break_op (0);
2460 ack = ntohl (msg->ack);
2461 LOG (GNUNET_ERROR_TYPE_DEBUG, " %s ACK %u (was %u)\n",
2462 GC_f2s (fwd), ack, fc->last_ack_recv);
2463 if (GC_is_pid_bigger (ack, fc->last_ack_recv))
2464 fc->last_ack_recv = ack;
2466 /* Cancel polling if the ACK is big enough. */
2467 if (NULL != fc->poll_task &&
2468 GC_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
2470 LOG (GNUNET_ERROR_TYPE_DEBUG, " Cancel poll\n");
2471 GNUNET_SCHEDULER_cancel (fc->poll_task);
2472 fc->poll_task = NULL;
2473 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
2476 connection_unlock_queue (c, fwd);
2483 * Core handler for cadet network traffic point-to-point ack polls.
2485 * @param cls closure
2486 * @param message message
2487 * @param peer peer identity this notification is about
2489 * @return GNUNET_OK to keep the connection open,
2490 * GNUNET_SYSERR to close it (signal serious error)
2493 GCC_handle_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
2494 const struct GNUNET_MessageHeader *message)
2496 struct GNUNET_CADET_Poll *msg;
2497 struct CadetConnection *c;
2498 struct CadetFlowControl *fc;
2503 msg = (struct GNUNET_CADET_Poll *) message;
2504 log_message (message, peer, &msg->cid);
2505 c = connection_get (&msg->cid);
2508 GNUNET_STATISTICS_update (stats, "# poll on unknown connection", 1,
2510 LOG (GNUNET_ERROR_TYPE_DEBUG, "POLL message on unknown connection %s!\n",
2511 GNUNET_h2s (GC_h2hc (&msg->cid)));
2512 send_broken_unknown (&msg->cid, &my_full_id, NULL, peer);
2516 /* Is this a forward or backward ACK?
2517 * Note: a poll should never be needed in a loopback case,
2518 * since there is no possiblility of packet loss there, so
2519 * this way of discerining FWD/BCK should not be a problem.
2521 id = GNUNET_PEER_search (peer);
2522 if (GCP_get_short_id (get_next_hop (c)) == id)
2524 LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD FC\n");
2527 else if (GCP_get_short_id (get_prev_hop (c)) == id)
2529 LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK FC\n");
2534 GNUNET_break_op (0);
2538 pid = ntohl (msg->pid);
2539 LOG (GNUNET_ERROR_TYPE_DEBUG, " PID %u, OLD %u\n", pid, fc->last_pid_recv);
2540 fc->last_pid_recv = pid;
2541 fwd = fc == &c->bck_fc;
2542 GCC_send_ack (c, fwd, GNUNET_YES);
2549 * Send an ACK on the appropriate connection/channel, depending on
2550 * the direction and the position of the peer.
2552 * @param c Which connection to send the hop-by-hop ACK.
2553 * @param fwd Is this a fwd ACK? (will go dest->root).
2554 * @param force Send the ACK even if suboptimal (e.g. requested by POLL).
2557 GCC_send_ack (struct CadetConnection *c, int fwd, int force)
2559 unsigned int buffer;
2561 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMC send %s ACK on %s\n",
2562 GC_f2s (fwd), GCC_2s (c));
2570 if (GNUNET_NO != c->destroy)
2572 LOG (GNUNET_ERROR_TYPE_DEBUG, " being destroyed, why bother...\n");
2576 /* Get available buffer space */
2577 if (GCC_is_terminal (c, fwd))
2579 LOG (GNUNET_ERROR_TYPE_DEBUG, " getting from all channels\n");
2580 buffer = GCT_get_channels_buffer (c->t);
2584 LOG (GNUNET_ERROR_TYPE_DEBUG, " getting from one connection\n");
2585 buffer = GCC_get_buffer (c, fwd);
2587 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer available: %u\n", buffer);
2588 if (0 == buffer && GNUNET_NO == force)
2591 /* Send available buffer space */
2592 if (GCC_is_origin (c, fwd))
2594 GNUNET_assert (NULL != c->t);
2595 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on channels...\n");
2596 GCT_unchoke_channels (c->t);
2600 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on connection\n");
2601 send_ack (c, buffer, fwd, force);
2607 * Initialize the connections subsystem
2609 * @param c Configuration handle.
2612 GCC_init (const struct GNUNET_CONFIGURATION_Handle *c)
2614 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
2616 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_MSGS_QUEUE",
2619 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
2620 "CADET", "MAX_MSGS_QUEUE", "MISSING");
2621 GNUNET_SCHEDULER_shutdown ();
2626 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_CONNECTIONS",
2629 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
2630 "CADET", "MAX_CONNECTIONS", "MISSING");
2631 GNUNET_SCHEDULER_shutdown ();
2636 GNUNET_CONFIGURATION_get_value_time (c, "CADET", "REFRESH_CONNECTION_TIME",
2637 &refresh_connection_time))
2639 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
2640 "CADET", "REFRESH_CONNECTION_TIME", "MISSING");
2641 GNUNET_SCHEDULER_shutdown ();
2644 create_connection_time = GNUNET_TIME_UNIT_SECONDS;
2645 connections = GNUNET_CONTAINER_multihashmap_create (1024, GNUNET_NO);
2650 * Destroy each connection on shutdown.
2652 * @param cls Closure (unused).
2653 * @param key Current key code (CID, unused).
2654 * @param value Value in the hash map (connection)
2656 * @return #GNUNET_YES, because we should continue to iterate,
2659 shutdown_iterator (void *cls,
2660 const struct GNUNET_HashCode *key,
2663 struct CadetConnection *c = value;
2671 * Shut down the connections subsystem.
2676 GNUNET_CONTAINER_multihashmap_iterate (connections, &shutdown_iterator, NULL);
2677 GNUNET_CONTAINER_multihashmap_destroy (connections);
2683 * Create a connection.
2685 * @param cid Connection ID (either created locally or imposed remotely).
2686 * @param t Tunnel this connection belongs to (or NULL);
2687 * @param path Path this connection has to use (copy is made).
2688 * @param own_pos Own position in the @c path path.
2690 * @return Newly created connection, NULL in case of error (own id not in path).
2692 struct CadetConnection *
2693 GCC_new (const struct GNUNET_CADET_Hash *cid,
2694 struct CadetTunnel *t,
2695 struct CadetPeerPath *path,
2696 unsigned int own_pos)
2698 struct CadetConnection *c;
2699 struct CadetPeerPath *p;
2701 p = path_duplicate (path);
2702 c = GNUNET_new (struct CadetConnection);
2704 GNUNET_assert (GNUNET_OK ==
2705 GNUNET_CONTAINER_multihashmap_put (connections,
2707 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2708 fc_init (&c->fwd_fc);
2709 fc_init (&c->bck_fc);
2714 GNUNET_assert (own_pos <= p->length - 1);
2715 c->own_pos = own_pos;
2719 if (GNUNET_OK != register_neighbors (c))
2723 path_invalidate (c->path);
2730 LOG (GNUNET_ERROR_TYPE_INFO, "New connection %s\n", GCC_2s (c));
2736 GCC_destroy (struct CadetConnection *c)
2744 if (2 == c->destroy) /* cancel queues -> GCP_queue_cancel -> q_destroy -> */
2745 return; /* -> message_sent -> GCC_destroy. Don't loop. */
2748 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying connection %s\n", GCC_2s (c));
2749 LOG (GNUNET_ERROR_TYPE_DEBUG, " fc's f: %p, b: %p\n",
2750 &c->fwd_fc, &c->bck_fc);
2751 LOG (GNUNET_ERROR_TYPE_DEBUG, " fc tasks f: %u, b: %u\n",
2752 c->fwd_fc.poll_task, c->bck_fc.poll_task);
2754 /* Cancel all traffic */
2755 if (NULL != c->path)
2757 connection_cancel_queues (c, GNUNET_YES);
2758 connection_cancel_queues (c, GNUNET_NO);
2759 unregister_neighbors (c);
2762 /* Cancel maintainance task (keepalive/timeout) */
2763 if (NULL != c->fwd_fc.poll_msg)
2765 GCC_cancel (c->fwd_fc.poll_msg);
2766 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL msg FWD canceled\n");
2768 if (NULL != c->bck_fc.poll_msg)
2770 GCC_cancel (c->bck_fc.poll_msg);
2771 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL msg BCK canceled\n");
2774 /* Delete from tunnel */
2776 GCT_remove_connection (c->t, c);
2778 if (GNUNET_NO == GCC_is_origin (c, GNUNET_YES) && NULL != c->path)
2779 path_destroy (c->path);
2780 if (NULL != c->fwd_maintenance_task)
2781 GNUNET_SCHEDULER_cancel (c->fwd_maintenance_task);
2782 if (NULL != c->bck_maintenance_task)
2783 GNUNET_SCHEDULER_cancel (c->bck_maintenance_task);
2784 if (NULL != c->fwd_fc.poll_task)
2786 GNUNET_SCHEDULER_cancel (c->fwd_fc.poll_task);
2787 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL FWD canceled\n");
2789 if (NULL != c->bck_fc.poll_task)
2791 GNUNET_SCHEDULER_cancel (c->bck_fc.poll_task);
2792 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL BCK canceled\n");
2795 GNUNET_break (GNUNET_YES ==
2796 GNUNET_CONTAINER_multihashmap_remove (connections,
2799 GNUNET_STATISTICS_update (stats, "# connections", -1, GNUNET_NO);
2804 * Get the connection ID.
2806 * @param c Connection to get the ID from.
2808 * @return ID of the connection.
2810 const struct GNUNET_CADET_Hash *
2811 GCC_get_id (const struct CadetConnection *c)
2818 * Get the connection ID.
2820 * @param c Connection to get the ID from.
2822 * @return ID of the connection.
2824 const struct GNUNET_HashCode *
2825 GCC_get_h (const struct CadetConnection *c)
2827 return GC_h2hc (&c->id);
2832 * Get the connection path.
2834 * @param c Connection to get the path from.
2836 * @return path used by the connection.
2838 const struct CadetPeerPath *
2839 GCC_get_path (const struct CadetConnection *c)
2841 if (GNUNET_NO == c->destroy)
2848 * Get the connection state.
2850 * @param c Connection to get the state from.
2852 * @return state of the connection.
2854 enum CadetConnectionState
2855 GCC_get_state (const struct CadetConnection *c)
2861 * Get the connection tunnel.
2863 * @param c Connection to get the tunnel from.
2865 * @return tunnel of the connection.
2867 struct CadetTunnel *
2868 GCC_get_tunnel (const struct CadetConnection *c)
2875 * Get free buffer space in a connection.
2877 * @param c Connection.
2878 * @param fwd Is query about FWD traffic?
2880 * @return Free buffer space [0 - max_msgs_queue/max_connections]
2883 GCC_get_buffer (struct CadetConnection *c, int fwd)
2885 struct CadetFlowControl *fc;
2887 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2889 return (fc->queue_max - fc->queue_n);
2893 * Get how many messages have we allowed to send to us from a direction.
2895 * @param c Connection.
2896 * @param fwd Are we asking about traffic from FWD (BCK messages)?
2898 * @return last_ack_sent - last_pid_recv
2901 GCC_get_allowed (struct CadetConnection *c, int fwd)
2903 struct CadetFlowControl *fc;
2905 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2906 if (CADET_CONNECTION_READY != c->state
2907 || GC_is_pid_bigger (fc->last_pid_recv, fc->last_ack_sent))
2911 return (fc->last_ack_sent - fc->last_pid_recv);
2915 * Get messages queued in a connection.
2917 * @param c Connection.
2918 * @param fwd Is query about FWD traffic?
2920 * @return Number of messages queued.
2923 GCC_get_qn (struct CadetConnection *c, int fwd)
2925 struct CadetFlowControl *fc;
2927 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2934 * Get next PID to use.
2936 * @param c Connection.
2937 * @param fwd Is query about FWD traffic?
2939 * @return Last PID used + 1.
2942 GCC_get_pid (struct CadetConnection *c, int fwd)
2944 struct CadetFlowControl *fc;
2946 fc = fwd ? &c->fwd_fc : &c->bck_fc;
2948 return fc->last_pid_sent + 1;
2953 * Allow the connection to advertise a buffer of the given size.
2955 * The connection will send an @c fwd ACK message (so: in direction !fwd)
2956 * allowing up to last_pid_recv + buffer.
2958 * @param c Connection.
2959 * @param buffer How many more messages the connection can accept.
2960 * @param fwd Is this about FWD traffic? (The ack will go dest->root).
2963 GCC_allow (struct CadetConnection *c, unsigned int buffer, int fwd)
2965 LOG (GNUNET_ERROR_TYPE_DEBUG, " allowing %s %u messages %s\n",
2966 GCC_2s (c), buffer, GC_f2s (fwd));
2967 send_ack (c, buffer, fwd, GNUNET_NO);
2972 * Notify other peers on a connection of a broken link. Mark connections
2973 * to destroy after all traffic has been sent.
2975 * @param c Connection on which there has been a disconnection.
2976 * @param peer Peer that disconnected.
2979 GCC_notify_broken (struct CadetConnection *c,
2980 struct CadetPeer *peer)
2982 struct CadetPeer *hop;
2985 LOG (GNUNET_ERROR_TYPE_DEBUG,
2986 " notify broken on %s due to %s disconnect\n",
2987 GCC_2s (c), GCP_2s (peer));
2989 hop = get_prev_hop (c);
2992 /* Path was NULL, we should have deleted the connection. */
2997 fwd = (peer == hop);
2998 if (GNUNET_YES == GCC_is_terminal (c, fwd))
3000 /* Local shutdown, no one to notify about this. */
3004 if (GNUNET_NO == c->destroy)
3005 send_broken (c, &my_full_id, GCP_get_id (peer), fwd);
3007 /* Connection will have at least one pending message
3008 * (the one we just scheduled), so no point in checking whether to
3009 * destroy immediately. */
3010 c->destroy = GNUNET_YES;
3011 c->state = CADET_CONNECTION_DESTROYED;
3014 * Cancel all queues, if no message is left, connection will be destroyed.
3016 connection_cancel_queues (c, !fwd);
3023 * Is this peer the first one on the connection?
3025 * @param c Connection.
3026 * @param fwd Is this about fwd traffic?
3028 * @return #GNUNET_YES if origin, #GNUNET_NO if relay/terminal.
3031 GCC_is_origin (struct CadetConnection *c, int fwd)
3033 if (!fwd && c->path->length - 1 == c->own_pos )
3035 if (fwd && 0 == c->own_pos)
3042 * Is this peer the last one on the connection?
3044 * @param c Connection.
3045 * @param fwd Is this about fwd traffic?
3046 * Note that the ROOT is the terminal for BCK traffic!
3048 * @return #GNUNET_YES if terminal, #GNUNET_NO if relay/origin.
3051 GCC_is_terminal (struct CadetConnection *c, int fwd)
3053 return GCC_is_origin (c, !fwd);
3058 * See if we are allowed to send by the next hop in the given direction.
3060 * @param c Connection.
3061 * @param fwd Is this about fwd traffic?
3063 * @return #GNUNET_YES in case it's OK to send.
3066 GCC_is_sendable (struct CadetConnection *c, int fwd)
3068 struct CadetFlowControl *fc;
3070 LOG (GNUNET_ERROR_TYPE_DEBUG, " checking sendability of %s traffic on %s\n",
3071 GC_f2s (fwd), GCC_2s (c));
3077 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3078 LOG (GNUNET_ERROR_TYPE_DEBUG,
3079 " last ack recv: %u, last pid sent: %u\n",
3080 fc->last_ack_recv, fc->last_pid_sent);
3081 if (GC_is_pid_bigger (fc->last_ack_recv, fc->last_pid_sent))
3083 LOG (GNUNET_ERROR_TYPE_DEBUG, " sendable\n");
3086 LOG (GNUNET_ERROR_TYPE_DEBUG, " not sendable\n");
3092 * Check if this connection is a direct one (never trim a direct connection).
3094 * @param c Connection.
3096 * @return #GNUNET_YES in case it's a direct connection, #GNUNET_NO otherwise.
3099 GCC_is_direct (struct CadetConnection *c)
3101 return (c->path->length == 2) ? GNUNET_YES : GNUNET_NO;
3105 * Sends an already built message on a connection, properly registering
3106 * all used resources.
3108 * @param message Message to send. Function makes a copy of it.
3109 * If message is not hop-by-hop, decrements TTL of copy.
3110 * @param payload_type Type of payload, in case the message is encrypted.
3111 * @param c Connection on which this message is transmitted.
3112 * @param fwd Is this a fwd message?
3113 * @param force Force the connection to accept the message (buffer overfill).
3114 * @param cont Continuation called once message is sent. Can be NULL.
3115 * @param cont_cls Closure for @c cont.
3117 * @return Handle to cancel the message before it's sent.
3118 * NULL on error or if @c cont is NULL.
3119 * Invalid on @c cont call.
3121 struct CadetConnectionQueue *
3122 GCC_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
3123 uint16_t payload_type, uint32_t payload_id,
3124 struct CadetConnection *c, int fwd, int force,
3125 GCC_sent cont, void *cont_cls)
3127 struct CadetFlowControl *fc;
3128 struct CadetConnectionQueue *q;
3134 size = ntohs (message->size);
3135 data = GNUNET_malloc (size);
3136 memcpy (data, message, size);
3137 type = ntohs (message->type);
3138 LOG (GNUNET_ERROR_TYPE_INFO, "--> %s (%s %4u) on connection %s (%u bytes)\n",
3139 GC_m2s (type), GC_m2s (payload_type), payload_id, GCC_2s (c), size);
3141 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3142 droppable = GNUNET_NO == force;
3145 struct GNUNET_CADET_AX *axmsg;
3146 struct GNUNET_CADET_Encrypted *emsg;
3147 struct GNUNET_CADET_KX *kmsg;
3148 struct GNUNET_CADET_ACK *amsg;
3149 struct GNUNET_CADET_Poll *pmsg;
3150 struct GNUNET_CADET_ConnectionDestroy *dmsg;
3151 struct GNUNET_CADET_ConnectionBroken *bmsg;
3154 case GNUNET_MESSAGE_TYPE_CADET_AX:
3155 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
3156 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == type)
3158 emsg = (struct GNUNET_CADET_Encrypted *) data;
3159 ttl = ntohl (emsg->ttl);
3162 GNUNET_break_op (0);
3167 emsg->ttl = htonl (ttl - 1);
3171 axmsg = (struct GNUNET_CADET_AX *) data;
3174 LOG (GNUNET_ERROR_TYPE_DEBUG, " Q_N+ %p %u\n", fc, fc->queue_n);
3175 LOG (GNUNET_ERROR_TYPE_DEBUG, "last pid sent %u\n", fc->last_pid_sent);
3176 LOG (GNUNET_ERROR_TYPE_DEBUG, " ack recv %u\n", fc->last_ack_recv);
3177 if (GNUNET_YES == droppable)
3183 LOG (GNUNET_ERROR_TYPE_DEBUG, " not droppable, Q_N stays the same\n");
3185 if (GC_is_pid_bigger (fc->last_pid_sent + 1, fc->last_ack_recv))
3187 GCC_start_poll (c, fwd);
3191 case GNUNET_MESSAGE_TYPE_CADET_KX:
3192 kmsg = (struct GNUNET_CADET_KX *) data;
3196 case GNUNET_MESSAGE_TYPE_CADET_ACK:
3197 amsg = (struct GNUNET_CADET_ACK *) data;
3199 LOG (GNUNET_ERROR_TYPE_DEBUG, " ack %u\n", ntohl (amsg->ack));
3200 droppable = GNUNET_NO;
3203 case GNUNET_MESSAGE_TYPE_CADET_POLL:
3204 pmsg = (struct GNUNET_CADET_Poll *) data;
3206 LOG (GNUNET_ERROR_TYPE_DEBUG, " poll %u\n", ntohl (pmsg->pid));
3207 droppable = GNUNET_NO;
3210 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
3211 dmsg = (struct GNUNET_CADET_ConnectionDestroy *) data;
3215 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
3216 bmsg = (struct GNUNET_CADET_ConnectionBroken *) data;
3220 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
3221 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
3230 if (fc->queue_n > fc->queue_max && droppable)
3232 GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)",
3235 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue full: %u/%u\n",
3236 fc->queue_n, fc->queue_max);
3237 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == type
3238 || GNUNET_MESSAGE_TYPE_CADET_AX == type)
3243 return NULL; /* Drop this message */
3246 LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P+ %s %u\n",
3247 GCC_2s (c), c->pending_messages);
3248 c->pending_messages++;
3250 q = GNUNET_new (struct CadetConnectionQueue);
3251 q->forced = !droppable;
3252 q->q = GCP_queue_add (get_hop (c, fwd), data, type, payload_type, payload_id,
3253 size, c, fwd, &conn_message_sent, q);
3256 LOG (GNUNET_ERROR_TYPE_DEBUG, "dropping msg on %s, NULL q\n", GCC_2s (c));
3262 q->cont_cls = cont_cls;
3263 return (NULL == cont) ? NULL : q;
3268 * Cancel a previously sent message while it's in the queue.
3270 * ONLY can be called before the continuation given to the send function
3271 * is called. Once the continuation is called, the message is no longer in the
3274 * @param q Handle to the queue.
3277 GCC_cancel (struct CadetConnectionQueue *q)
3279 LOG (GNUNET_ERROR_TYPE_DEBUG, "! GMC cancel message\n");
3281 /* queue destroy calls message_sent, which calls q->cont and frees q */
3282 GCP_queue_destroy (q->q, GNUNET_YES, GNUNET_NO, 0);
3287 * Sends a CREATE CONNECTION message for a path to a peer.
3288 * Changes the connection and tunnel states if necessary.
3290 * @param connection Connection to create.
3293 GCC_send_create (struct CadetConnection *connection)
3295 enum CadetTunnelCState state;
3298 size = sizeof (struct GNUNET_CADET_ConnectionCreate);
3299 size += connection->path->length * sizeof (struct GNUNET_PeerIdentity);
3301 LOG (GNUNET_ERROR_TYPE_INFO, "---> %s on connection %s (%u bytes)\n",
3302 GC_m2s (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE),
3303 GCC_2s (connection), size);
3304 LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P+ %p %u (create)\n",
3305 connection, connection->pending_messages);
3306 connection->pending_messages++;
3308 connection->maintenance_q =
3309 GCP_queue_add (get_next_hop (connection), NULL,
3310 GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE, 0, 0,
3311 size, connection, GNUNET_YES, &conn_message_sent, NULL);
3313 state = GCT_get_cstate (connection->t);
3314 if (CADET_TUNNEL_SEARCHING == state || CADET_TUNNEL_NEW == state)
3315 GCT_change_cstate (connection->t, CADET_TUNNEL_WAITING);
3316 if (CADET_CONNECTION_NEW == connection->state)
3317 connection_change_state (connection, CADET_CONNECTION_SENT);
3322 * Send a message to all peers in this connection that the connection
3323 * is no longer valid.
3325 * If some peer should not receive the message, it should be zero'ed out
3326 * before calling this function.
3328 * @param c The connection whose peers to notify.
3331 GCC_send_destroy (struct CadetConnection *c)
3333 struct GNUNET_CADET_ConnectionDestroy msg;
3335 if (GNUNET_YES == c->destroy)
3338 msg.header.size = htons (sizeof (msg));
3339 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY);
3341 LOG (GNUNET_ERROR_TYPE_DEBUG,
3342 " sending connection destroy for connection %s\n",
3345 if (GNUNET_NO == GCC_is_terminal (c, GNUNET_YES))
3346 GNUNET_assert (NULL == GCC_send_prebuilt_message (&msg.header, 0, 0, c,
3347 GNUNET_YES, GNUNET_YES,
3349 if (GNUNET_NO == GCC_is_terminal (c, GNUNET_NO))
3350 GNUNET_assert (NULL == GCC_send_prebuilt_message (&msg.header, 0, 0, c,
3351 GNUNET_NO, GNUNET_YES,
3353 c->destroy = GNUNET_YES;
3354 c->state = CADET_CONNECTION_DESTROYED;
3359 * @brief Start a polling timer for the connection.
3361 * When a neighbor does not accept more traffic on the connection it could be
3362 * caused by a simple congestion or by a lost ACK. Polling enables to check
3363 * for the lastest ACK status for a connection.
3365 * @param c Connection.
3366 * @param fwd Should we poll in the FWD direction?
3369 GCC_start_poll (struct CadetConnection *c, int fwd)
3371 struct CadetFlowControl *fc;
3373 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3374 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL %s requested\n",
3376 if (NULL != fc->poll_task || NULL != fc->poll_msg)
3378 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** not needed (%u, %p)\n",
3379 fc->poll_task, fc->poll_msg);
3382 LOG (GNUNET_ERROR_TYPE_DEBUG, " *** POLL started on request\n");
3383 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
3390 * @brief Stop polling a connection for ACKs.
3392 * Once we have enough ACKs for future traffic, polls are no longer necessary.
3394 * @param c Connection.
3395 * @param fwd Should we stop the poll in the FWD direction?
3398 GCC_stop_poll (struct CadetConnection *c, int fwd)
3400 struct CadetFlowControl *fc;
3402 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3403 if (NULL != fc->poll_task)
3405 GNUNET_SCHEDULER_cancel (fc->poll_task);
3406 fc->poll_task = NULL;
3411 * Get a (static) string for a connection.
3413 * @param c Connection.
3416 GCC_2s (const struct CadetConnection *c)
3423 static char buf[128];
3425 SPRINTF (buf, "%s (->%s)",
3426 GNUNET_h2s (GC_h2hc (GCC_get_id (c))), GCT_2s (c->t));
3429 return GNUNET_h2s (GC_h2hc (&c->id));
3434 * Log all possible info about the connection state.
3436 * @param c Connection to debug.
3437 * @param level Debug level to use.
3440 GCC_debug (const struct CadetConnection *c, enum GNUNET_ErrorType level)
3445 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
3447 __FILE__, __FUNCTION__, __LINE__);
3453 LOG2 (level, "CCC DEBUG NULL CONNECTION\n");
3457 LOG2 (level, "CCC DEBUG CONNECTION %s\n", GCC_2s (c));
3458 s = path_2s (c->path);
3459 LOG2 (level, "CCC path %s, own pos: %u\n", s, c->own_pos);
3461 LOG2 (level, "CCC state: %s, destroy: %u\n",
3462 GCC_state2s (c->state), c->destroy);
3463 LOG2 (level, "CCC pending messages: %u\n", c->pending_messages);
3464 if (NULL != c->perf)
3465 LOG2 (level, "CCC us/byte: %f\n", c->perf->avg);
3467 LOG2 (level, "CCC FWD flow control:\n");
3468 LOG2 (level, "CCC queue: %u/%u\n", c->fwd_fc.queue_n, c->fwd_fc.queue_max);
3469 LOG2 (level, "CCC last PID sent: %5u, recv: %5u\n",
3470 c->fwd_fc.last_pid_sent, c->fwd_fc.last_pid_recv);
3471 LOG2 (level, "CCC last ACK sent: %5u, recv: %5u\n",
3472 c->fwd_fc.last_ack_sent, c->fwd_fc.last_ack_recv);
3473 LOG2 (level, "CCC recv PID bitmap: %X\n", c->fwd_fc.recv_bitmap);
3474 LOG2 (level, "CCC POLL: task %d, msg %p, msg_ack %p)\n",
3475 c->fwd_fc.poll_task, c->fwd_fc.poll_msg, c->fwd_fc.ack_msg);
3477 LOG2 (level, "CCC BCK flow control:\n");
3478 LOG2 (level, "CCC queue: %u/%u\n", c->bck_fc.queue_n, c->bck_fc.queue_max);
3479 LOG2 (level, "CCC last PID sent: %5u, recv: %5u\n",
3480 c->bck_fc.last_pid_sent, c->bck_fc.last_pid_recv);
3481 LOG2 (level, "CCC last ACK sent: %5u, recv: %5u\n",
3482 c->bck_fc.last_ack_sent, c->bck_fc.last_ack_recv);
3483 LOG2 (level, "CCC recv PID bitmap: %X\n", c->bck_fc.recv_bitmap);
3484 LOG2 (level, "CCC POLL: task %d, msg %p, msg_ack %p)\n",
3485 c->bck_fc.poll_task, c->bck_fc.poll_msg, c->bck_fc.ack_msg);
3487 LOG2 (level, "CCC DEBUG CONNECTION END\n");