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3 (C) 2010,2011 Christian Grothoff (and other contributing authors)
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22 * @file transport/gnunet-service-transport_neighbours.c
23 * @brief neighbour management
24 * @author Christian Grothoff
27 #include "gnunet_ats_service.h"
28 #include "gnunet-service-transport_neighbours.h"
29 #include "gnunet-service-transport_plugins.h"
30 #include "gnunet-service-transport_validation.h"
31 #include "gnunet-service-transport.h"
32 #include "gnunet_peerinfo_service.h"
33 #include "gnunet_constants.h"
34 #include "transport.h"
38 * Size of the neighbour hash map.
40 #define NEIGHBOUR_TABLE_SIZE 256
43 * How often must a peer violate bandwidth quotas before we start
44 * to simply drop its messages?
46 #define QUOTA_VIOLATION_DROP_THRESHOLD 10
50 * Entry in neighbours.
52 struct NeighbourMapEntry;
56 * For each neighbour we keep a list of messages
57 * that we still want to transmit to the neighbour.
63 * This is a doubly linked list.
65 struct MessageQueue *next;
68 * This is a doubly linked list.
70 struct MessageQueue *prev;
73 * Once this message is actively being transmitted, which
74 * neighbour is it associated with?
76 struct NeighbourMapEntry *n;
79 * Function to call once we're done.
81 GST_NeighbourSendContinuation cont;
89 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
90 * stuck together in memory. Allocated at the end of this struct.
92 const char *message_buf;
95 * Size of the message buf
97 size_t message_buf_size;
100 * At what time should we fail?
102 struct GNUNET_TIME_Absolute timeout;
108 * Entry in neighbours.
110 struct NeighbourMapEntry
114 * Head of list of messages we would like to send to this peer;
115 * must contain at most one message per client.
117 struct MessageQueue *messages_head;
120 * Tail of list of messages we would like to send to this peer; must
121 * contain at most one message per client.
123 struct MessageQueue *messages_tail;
126 * Context for address suggestion.
127 * NULL after we are connected.
129 struct GNUNET_ATS_SuggestionContext *asc;
132 * Performance data for the peer.
134 struct GNUNET_TRANSPORT_ATS_Information *ats;
137 * Are we currently trying to send a message? If so, which one?
139 struct MessageQueue *is_active;
142 * Active session for communicating with the peer.
144 struct Session *session;
147 * Name of the plugin we currently use.
152 * Address used for communicating with the peer, NULL for inbound connections.
157 * Number of bytes in 'addr'.
162 * Identity of this neighbour.
164 struct GNUNET_PeerIdentity id;
167 * ID of task scheduled to run when this peer is about to
168 * time out (will free resources associated with the peer).
170 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
173 * ID of task scheduled to run when we should try transmitting
174 * the head of the message queue.
176 GNUNET_SCHEDULER_TaskIdentifier transmission_task;
179 * Tracker for inbound bandwidth.
181 struct GNUNET_BANDWIDTH_Tracker in_tracker;
184 * How often has the other peer (recently) violated the inbound
185 * traffic limit? Incremented by 10 per violation, decremented by 1
186 * per non-violation (for each time interval).
188 unsigned int quota_violation_count;
191 * Number of values in 'ats' array.
193 unsigned int ats_count;
196 * Are we already in the process of disconnecting this neighbour?
201 * Do we currently consider this neighbour connected? (as far as
202 * the connect/disconnect callbacks are concerned)?
210 * All known neighbours and their HELLOs.
212 static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
215 * Closure for connect_notify_cb and disconnect_notify_cb
217 static void *callback_cls;
220 * Function to call when we connected to a neighbour.
222 static GNUNET_TRANSPORT_NotifyConnect connect_notify_cb;
225 * Function to call when we disconnected from a neighbour.
227 static GNUNET_TRANSPORT_NotifyDisconnect disconnect_notify_cb;
230 * Lookup a neighbour entry in the neighbours hash map.
232 * @param pid identity of the peer to look up
233 * @return the entry, NULL if there is no existing record
235 static struct NeighbourMapEntry *
236 lookup_neighbour (const struct GNUNET_PeerIdentity *pid)
238 return GNUNET_CONTAINER_multihashmap_get (neighbours, &pid->hashPubKey);
243 * Task invoked to start a transmission to another peer.
245 * @param cls the 'struct NeighbourMapEntry'
246 * @param tc scheduler context
249 transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
253 * We're done with our transmission attempt, continue processing.
255 * @param cls the 'struct MessageQueue' of the message
256 * @param receiver intended receiver
257 * @param success whether it worked or not
260 transmit_send_continuation (void *cls,
261 const struct GNUNET_PeerIdentity *receiver,
264 struct MessageQueue *mq;
265 struct NeighbourMapEntry *n;
271 GNUNET_assert (n->is_active == mq);
273 GNUNET_assert (n->transmission_task == GNUNET_SCHEDULER_NO_TASK);
274 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
276 if (NULL != mq->cont)
277 mq->cont (mq->cont_cls, success);
283 * Check the ready list for the given neighbour and if a plugin is
284 * ready for transmission (and if we have a message), do so!
286 * @param neighbour target peer for which to transmit
289 try_transmission_to_peer (struct NeighbourMapEntry *n)
291 struct MessageQueue *mq;
292 struct GNUNET_TIME_Relative timeout;
294 struct GNUNET_TRANSPORT_PluginFunctions *papi;
296 if (n->is_active != NULL)
297 return; /* transmission already pending */
298 if (n->transmission_task != GNUNET_SCHEDULER_NO_TASK)
299 return; /* currently waiting for bandwidth */
300 mq = n->messages_head;
301 while (NULL != (mq = n->messages_head))
303 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
304 if (timeout.rel_value > 0)
306 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR); /* timeout */
309 return; /* no more messages */
311 papi = GST_plugins_find (n->plugin_name);
317 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
322 papi->send (papi->cls, &n->id, mq->message_buf, mq->message_buf_size,
323 0 /* priority -- remove from plugin API? */ ,
324 timeout, n->session, n->addr, n->addrlen, GNUNET_YES,
325 &transmit_send_continuation, mq);
328 /* failure, but 'send' would not call continuation in this case,
329 * so we need to do it here! */
330 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);
331 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
337 * Task invoked to start a transmission to another peer.
339 * @param cls the 'struct NeighbourMapEntry'
340 * @param tc scheduler context
343 transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
345 struct NeighbourMapEntry *n = cls;
347 n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
348 try_transmission_to_peer (n);
353 * Initialize the neighbours subsystem.
355 * @param cls closure for callbacks
356 * @param connect_cb function to call if we connect to a peer
357 * @param disconnect_cb function to call if we disconnect from a peer
360 GST_neighbours_start (void *cls, GNUNET_TRANSPORT_NotifyConnect connect_cb,
361 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb)
364 connect_notify_cb = connect_cb;
365 disconnect_notify_cb = disconnect_cb;
366 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
371 * Disconnect from the given neighbour, clean up the record.
373 * @param n neighbour to disconnect from
376 disconnect_neighbour (struct NeighbourMapEntry *n)
378 struct MessageQueue *mq;
380 if (GNUNET_YES == n->in_disconnect)
382 n->in_disconnect = GNUNET_YES;
383 while (NULL != (mq = n->messages_head))
385 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
386 mq->cont (mq->cont_cls, GNUNET_SYSERR);
389 if (NULL != n->is_active)
391 n->is_active->n = NULL;
394 if (GNUNET_YES == n->is_connected)
396 n->is_connected = GNUNET_NO;
397 disconnect_notify_cb (callback_cls, &n->id);
399 GNUNET_assert (GNUNET_YES ==
400 GNUNET_CONTAINER_multihashmap_remove (neighbours,
401 &n->id.hashPubKey, n));
402 if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
404 GNUNET_SCHEDULER_cancel (n->timeout_task);
405 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
407 if (GNUNET_SCHEDULER_NO_TASK != n->transmission_task)
409 GNUNET_SCHEDULER_cancel (n->timeout_task);
410 n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
414 GNUNET_ATS_suggest_address_cancel (n->asc);
417 GNUNET_array_grow (n->ats, n->ats_count, 0);
418 if (NULL != n->plugin_name)
420 GNUNET_free (n->plugin_name);
421 n->plugin_name = NULL;
425 GNUNET_free (n->addr);
435 * Peer has been idle for too long. Disconnect.
437 * @param cls the 'struct NeighbourMapEntry' of the neighbour that went idle
438 * @param tc scheduler context
441 neighbour_timeout_task (void *cls,
442 const struct GNUNET_SCHEDULER_TaskContext *tc)
444 struct NeighbourMapEntry *n = cls;
446 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
447 disconnect_neighbour (n);
452 * Disconnect from the given neighbour.
455 * @param key hash of neighbour's public key (not used)
456 * @param value the 'struct NeighbourMapEntry' of the neighbour
459 disconnect_all_neighbours (void *cls, const GNUNET_HashCode * key, void *value)
461 struct NeighbourMapEntry *n = value;
464 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s', %s\n",
465 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
467 disconnect_neighbour (n);
473 * Cleanup the neighbours subsystem.
476 GST_neighbours_stop ()
478 GNUNET_assert (neighbours != NULL);
480 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &disconnect_all_neighbours,
482 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
485 connect_notify_cb = NULL;
486 disconnect_notify_cb = NULL;
491 * For an existing neighbour record, set the active connection to
494 * @param peer identity of the peer to switch the address for
495 * @param plugin_name name of transport that delivered the PONG
496 * @param address address of the other peer, NULL if other peer
498 * @param address_len number of bytes in address
499 * @param session session to use (or NULL)
500 * @param ats performance data
501 * @param ats_count number of entries in ats (excluding 0-termination)
504 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
505 const char *plugin_name, const void *address,
506 size_t address_len, struct Session *session,
507 const struct GNUNET_TRANSPORT_ATS_Information
508 *ats, uint32_t ats_count)
510 struct NeighbourMapEntry *n;
511 struct GNUNET_MessageHeader connect_msg;
513 GNUNET_assert (neighbours != NULL);
515 n = lookup_neighbour (peer);
523 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
524 "SWITCH! Peer `%4s' switches to plugin `%s' address '%s' session %X\n",
525 GNUNET_i2s (peer), plugin_name,
526 (address_len == 0) ? "<inbound>" : GST_plugins_a2s (plugin_name,
532 GNUNET_free_non_null (n->addr);
533 n->addr = GNUNET_malloc (address_len);
534 memcpy (n->addr, address, address_len);
535 n->addrlen = address_len;
536 n->session = session;
537 GNUNET_array_grow (n->ats, n->ats_count, ats_count);
539 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
540 GNUNET_free_non_null (n->plugin_name);
541 n->plugin_name = GNUNET_strdup (plugin_name);
542 GNUNET_SCHEDULER_cancel (n->timeout_task);
544 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
545 &neighbour_timeout_task, n);
546 connect_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
547 connect_msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
548 GST_neighbours_send (peer, &connect_msg, sizeof (connect_msg),
549 GNUNET_TIME_UNIT_FOREVER_REL, NULL, NULL);
554 * Try to connect to the target peer using the given address
556 * @param cls the 'struct NeighbourMapEntry' of the target
557 * @param target identity of the target peer
558 * @param plugin_name name of the plugin
559 * @param plugin_address binary address
560 * @param plugin_address_len length of address
561 * @param bandwidth available bandwidth
562 * @param ats performance data for the address (as far as known)
563 * @param ats_count number of performance records in 'ats'
566 try_connect_using_address (void *cls, const struct GNUNET_PeerIdentity *target,
567 const char *plugin_name, const void *plugin_address,
568 size_t plugin_address_len, struct Session *session,
569 struct GNUNET_BANDWIDTH_Value32NBO bandwidth,
570 const struct GNUNET_TRANSPORT_ATS_Information *ats,
573 struct NeighbourMapEntry *n = cls;
577 was_connected = n->is_connected;
578 n->is_connected = GNUNET_YES;
579 GST_neighbours_switch_to_address (target, plugin_name, plugin_address,
580 plugin_address_len, session, ats,
582 if (GNUNET_YES == was_connected)
584 connect_notify_cb (callback_cls, target, n->ats, n->ats_count);
589 * Try to create a connection to the given target (eventually).
591 * @param target peer to try to connect to
594 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
596 struct NeighbourMapEntry *n;
598 GNUNET_assert (neighbours != NULL);
601 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Trying to connect to peer `%s'\n",
602 GNUNET_i2s (target));
606 memcmp (target, &GST_my_identity,
607 sizeof (struct GNUNET_PeerIdentity)));
608 n = lookup_neighbour (target);
609 if ((NULL != n) && (GNUNET_YES == n->is_connected))
610 return; /* already connected */
614 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
615 "Unknown peer `%s', creating new neighbour\n",
616 GNUNET_i2s (target));
618 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
620 GNUNET_array_grow (n->ats, n->ats_count, 1);
621 n->ats[0].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);;
622 n->ats[0].value = htonl (0);
623 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
624 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
625 MAX_BANDWIDTH_CARRY_S);
627 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
628 &neighbour_timeout_task, n);
629 GNUNET_assert (GNUNET_OK ==
630 GNUNET_CONTAINER_multihashmap_put (neighbours,
631 &n->id.hashPubKey, n,
632 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
635 return; /* already trying */
637 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
638 "Asking ATS for suggested address to connect to peer `%s'\n",
639 GNUNET_i2s (target));
642 GNUNET_ATS_suggest_address (GST_ats, target, &try_connect_using_address,
648 * Test if we're connected to the given peer.
650 * @param target peer to test
651 * @return GNUNET_YES if we are connected, GNUNET_NO if not
654 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
656 struct NeighbourMapEntry *n;
658 GNUNET_assert (neighbours != NULL);
660 n = lookup_neighbour (target);
661 if ((NULL == n) || (n->is_connected != GNUNET_YES))
662 return GNUNET_NO; /* not connected */
668 * A session was terminated. Take note.
670 * @param peer identity of the peer where the session died
671 * @param session session that is gone
674 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
675 struct Session *session)
677 struct NeighbourMapEntry *n;
679 GNUNET_assert (neighbours != NULL);
681 n = lookup_neighbour (peer);
684 if (session != n->session)
685 return; /* doesn't affect us */
687 if (GNUNET_YES != n->is_connected)
688 return; /* not connected anymore anyway, shouldn't matter */
690 GNUNET_SCHEDULER_cancel (n->timeout_task);
692 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
693 &neighbour_timeout_task, n);
694 /* try QUICKLY to re-establish a connection, reduce timeout! */
697 /* how can this be!? */
702 GNUNET_ATS_suggest_address (GST_ats, peer, &try_connect_using_address, n);
707 * Transmit a message to the given target using the active connection.
709 * @param target destination
710 * @param msg message to send
711 * @param msg_size number of bytes in msg
712 * @param timeout when to fail with timeout
713 * @param cont function to call when done
714 * @param cont_cls closure for 'cont'
717 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
718 size_t msg_size, struct GNUNET_TIME_Relative timeout,
719 GST_NeighbourSendContinuation cont, void *cont_cls)
721 struct NeighbourMapEntry *n;
722 struct MessageQueue *mq;
724 GNUNET_assert (neighbours != NULL);
726 n = lookup_neighbour (target);
727 if ((n == NULL) || (GNUNET_YES != n->is_connected))
729 GNUNET_STATISTICS_update (GST_stats,
731 ("# messages not sent (no such peer or not connected)"),
735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
736 "Could not send message to peer `%s': unknown neighbor",
737 GNUNET_i2s (target));
738 if (GNUNET_YES != n->is_connected)
739 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
740 "Could not send message to peer `%s': not connected\n",
741 GNUNET_i2s (target));
744 cont (cont_cls, GNUNET_SYSERR);
748 GNUNET_assert (msg_size >= sizeof (struct GNUNET_MessageHeader));
749 GNUNET_STATISTICS_update (GST_stats,
751 ("# bytes in message queue for other peers"),
752 msg_size, GNUNET_NO);
753 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
755 mq->cont_cls = cont_cls;
756 /* FIXME: this memcpy can be up to 7% of our total runtime! */
757 memcpy (&mq[1], msg, msg_size);
758 mq->message_buf = (const char *) &mq[1];
759 mq->message_buf_size = msg_size;
760 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
761 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
762 if ((GNUNET_SCHEDULER_NO_TASK == n->transmission_task) &&
763 (NULL == n->is_active))
764 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
769 * We have received a message from the given sender. How long should
770 * we delay before receiving more? (Also used to keep the peer marked
773 * @param sender sender of the message
774 * @param size size of the message
775 * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
776 * GNUNET_NO if the neighbour is not connected or violates the quota
777 * @return how long to wait before reading more from this sender
779 struct GNUNET_TIME_Relative
780 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
781 *sender, ssize_t size, int *do_forward)
783 struct NeighbourMapEntry *n;
784 struct GNUNET_TIME_Relative ret;
786 GNUNET_assert (neighbours != NULL);
788 n = lookup_neighbour (sender);
791 *do_forward = GNUNET_NO;
792 return GNUNET_TIME_UNIT_ZERO;
794 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
796 n->quota_violation_count++;
798 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
799 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
800 n->in_tracker.available_bytes_per_s__,
801 n->quota_violation_count);
803 /* Discount 32k per violation */
804 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
808 if (n->quota_violation_count > 0)
810 /* try to add 32k back */
811 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
812 n->quota_violation_count--;
815 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
817 GNUNET_STATISTICS_update (GST_stats,
819 ("# bandwidth quota violations by other peers"),
821 *do_forward = GNUNET_NO;
822 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
824 *do_forward = GNUNET_YES;
825 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
826 if (ret.rel_value > 0)
829 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
830 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
831 (unsigned long long) n->in_tracker.
832 consumption_since_last_update__,
833 (unsigned int) n->in_tracker.available_bytes_per_s__,
834 (unsigned long long) ret.rel_value);
836 GNUNET_STATISTICS_update (GST_stats,
837 gettext_noop ("# ms throttling suggested"),
838 (int64_t) ret.rel_value, GNUNET_NO);
845 * Keep the connection to the given neighbour alive longer,
846 * we received a KEEPALIVE (or equivalent).
848 * @param neighbour neighbour to keep alive
851 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
853 struct NeighbourMapEntry *n;
855 GNUNET_assert (neighbours != NULL);
857 n = lookup_neighbour (neighbour);
860 GNUNET_STATISTICS_update (GST_stats,
862 ("# KEEPALIVE messages discarded (not connected)"),
866 GNUNET_SCHEDULER_cancel (n->timeout_task);
868 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
869 &neighbour_timeout_task, n);
874 * Change the incoming quota for the given peer.
876 * @param neighbour identity of peer to change qutoa for
877 * @param quota new quota
880 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
881 struct GNUNET_BANDWIDTH_Value32NBO quota)
883 struct NeighbourMapEntry *n;
885 GNUNET_assert (neighbours != NULL);
887 n = lookup_neighbour (neighbour);
890 GNUNET_STATISTICS_update (GST_stats,
892 ("# SET QUOTA messages ignored (no such peer)"),
896 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
897 if (0 != ntohl (quota.value__))
900 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
901 GNUNET_i2s (&n->id), "SET_QUOTA");
903 GNUNET_STATISTICS_update (GST_stats,
904 gettext_noop ("# disconnects due to quota of 0"), 1,
906 disconnect_neighbour (n);
911 * Closure for the neighbours_iterate function.
913 struct IteratorContext
916 * Function to call on each connected neighbour.
918 GST_NeighbourIterator cb;
928 * Call the callback from the closure for each connected neighbour.
930 * @param cls the 'struct IteratorContext'
931 * @param key the hash of the public key of the neighbour
932 * @param value the 'struct NeighbourMapEntry'
933 * @return GNUNET_OK (continue to iterate)
936 neighbours_iterate (void *cls, const GNUNET_HashCode * key, void *value)
938 struct IteratorContext *ic = cls;
939 struct NeighbourMapEntry *n = value;
941 if (GNUNET_YES != n->is_connected)
944 GNUNET_assert (n->ats_count > 0);
945 ic->cb (ic->cb_cls, &n->id, n->ats, n->ats_count);
951 * Iterate over all connected neighbours.
953 * @param cb function to call
954 * @param cb_cls closure for cb
957 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
959 struct IteratorContext ic;
961 GNUNET_assert (neighbours != NULL);
965 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
970 * If we have an active connection to the given target, it must be shutdown.
972 * @param target peer to disconnect from
975 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
977 struct NeighbourMapEntry *n;
978 struct GNUNET_TRANSPORT_PluginFunctions *papi;
979 struct GNUNET_MessageHeader disconnect_msg;
981 GNUNET_assert (neighbours != NULL);
983 n = lookup_neighbour (target);
985 return; /* not active */
986 if (GNUNET_YES == n->is_connected)
988 /* we're actually connected, send DISCONNECT message */
989 disconnect_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
990 disconnect_msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
991 papi = GST_plugins_find (n->plugin_name);
993 papi->send (papi->cls, target, (const void *) &disconnect_msg,
994 sizeof (struct GNUNET_MessageHeader),
995 UINT32_MAX /* priority */ ,
996 GNUNET_TIME_UNIT_FOREVER_REL, n->session, n->addr, n->addrlen,
997 GNUNET_YES, NULL, NULL);
999 disconnect_neighbour (n);
1003 /* end of file gnunet-service-transport_neighbours.c */