2 This file is part of GNUnet.
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 * counter for connected neighbours
232 static int neighbours_connected;
235 * Lookup a neighbour entry in the neighbours hash map.
237 * @param pid identity of the peer to look up
238 * @return the entry, NULL if there is no existing record
240 static struct NeighbourMapEntry *
241 lookup_neighbour (const struct GNUNET_PeerIdentity *pid)
243 return GNUNET_CONTAINER_multihashmap_get (neighbours, &pid->hashPubKey);
248 * Task invoked to start a transmission to another peer.
250 * @param cls the 'struct NeighbourMapEntry'
251 * @param tc scheduler context
254 transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
258 * We're done with our transmission attempt, continue processing.
260 * @param cls the 'struct MessageQueue' of the message
261 * @param receiver intended receiver
262 * @param success whether it worked or not
265 transmit_send_continuation (void *cls,
266 const struct GNUNET_PeerIdentity *receiver,
269 struct MessageQueue *mq;
270 struct NeighbourMapEntry *n;
276 GNUNET_assert (n->is_active == mq);
278 GNUNET_assert (n->transmission_task == GNUNET_SCHEDULER_NO_TASK);
279 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
281 if (NULL != mq->cont)
282 mq->cont (mq->cont_cls, success);
288 * Check the ready list for the given neighbour and if a plugin is
289 * ready for transmission (and if we have a message), do so!
291 * @param neighbour target peer for which to transmit
294 try_transmission_to_peer (struct NeighbourMapEntry *n)
296 struct MessageQueue *mq;
297 struct GNUNET_TIME_Relative timeout;
299 struct GNUNET_TRANSPORT_PluginFunctions *papi;
301 if (n->is_active != NULL)
302 return; /* transmission already pending */
303 if (n->transmission_task != GNUNET_SCHEDULER_NO_TASK)
304 return; /* currently waiting for bandwidth */
305 mq = n->messages_head;
306 while (NULL != (mq = n->messages_head))
308 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
309 if (timeout.rel_value > 0)
311 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR); /* timeout */
314 return; /* no more messages */
316 papi = GST_plugins_find (n->plugin_name);
322 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
327 papi->send (papi->cls, &n->id, mq->message_buf, mq->message_buf_size,
328 0 /* priority -- remove from plugin API? */ ,
329 timeout, n->session, n->addr, n->addrlen, GNUNET_YES,
330 &transmit_send_continuation, mq);
333 /* failure, but 'send' would not call continuation in this case,
334 * so we need to do it here! */
335 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);
336 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
342 * Task invoked to start a transmission to another peer.
344 * @param cls the 'struct NeighbourMapEntry'
345 * @param tc scheduler context
348 transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
350 struct NeighbourMapEntry *n = cls;
352 n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
353 try_transmission_to_peer (n);
358 * Initialize the neighbours subsystem.
360 * @param cls closure for callbacks
361 * @param connect_cb function to call if we connect to a peer
362 * @param disconnect_cb function to call if we disconnect from a peer
365 GST_neighbours_start (void *cls, GNUNET_TRANSPORT_NotifyConnect connect_cb,
366 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb)
369 connect_notify_cb = connect_cb;
370 disconnect_notify_cb = disconnect_cb;
371 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
376 * Disconnect from the given neighbour, clean up the record.
378 * @param n neighbour to disconnect from
381 disconnect_neighbour (struct NeighbourMapEntry *n)
383 struct MessageQueue *mq;
385 if (GNUNET_YES == n->in_disconnect)
387 n->in_disconnect = GNUNET_YES;
388 while (NULL != (mq = n->messages_head))
390 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
391 mq->cont (mq->cont_cls, GNUNET_SYSERR);
394 if (NULL != n->is_active)
396 n->is_active->n = NULL;
399 if (GNUNET_YES == n->is_connected)
401 n->is_connected = GNUNET_NO;
403 GNUNET_assert (neighbours_connected > 0);
404 neighbours_connected--;
406 GNUNET_STATISTICS_update (GST_stats,
408 ("# peers connected"),
410 disconnect_notify_cb (callback_cls, &n->id);
412 GNUNET_assert (GNUNET_YES ==
413 GNUNET_CONTAINER_multihashmap_remove (neighbours,
414 &n->id.hashPubKey, n));
415 if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
417 GNUNET_SCHEDULER_cancel (n->timeout_task);
418 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
420 if (GNUNET_SCHEDULER_NO_TASK != n->transmission_task)
422 GNUNET_SCHEDULER_cancel (n->timeout_task);
423 n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
427 GNUNET_ATS_suggest_address_cancel (n->asc);
430 GNUNET_array_grow (n->ats, n->ats_count, 0);
431 if (NULL != n->plugin_name)
433 GNUNET_free (n->plugin_name);
434 n->plugin_name = NULL;
438 GNUNET_free (n->addr);
448 * Peer has been idle for too long. Disconnect.
450 * @param cls the 'struct NeighbourMapEntry' of the neighbour that went idle
451 * @param tc scheduler context
454 neighbour_timeout_task (void *cls,
455 const struct GNUNET_SCHEDULER_TaskContext *tc)
457 struct NeighbourMapEntry *n = cls;
459 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
460 disconnect_neighbour (n);
465 * Disconnect from the given neighbour.
468 * @param key hash of neighbour's public key (not used)
469 * @param value the 'struct NeighbourMapEntry' of the neighbour
472 disconnect_all_neighbours (void *cls, const GNUNET_HashCode * key, void *value)
474 struct NeighbourMapEntry *n = value;
477 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s', %s\n",
478 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
480 disconnect_neighbour (n);
486 * Cleanup the neighbours subsystem.
489 GST_neighbours_stop ()
491 GNUNET_assert (neighbours != NULL);
493 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &disconnect_all_neighbours,
495 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
496 GNUNET_assert (neighbours_connected == 0);
499 connect_notify_cb = NULL;
500 disconnect_notify_cb = NULL;
505 * For an existing neighbour record, set the active connection to
508 * @param peer identity of the peer to switch the address for
509 * @param plugin_name name of transport that delivered the PONG
510 * @param address address of the other peer, NULL if other peer
512 * @param address_len number of bytes in address
513 * @param session session to use (or NULL)
514 * @param ats performance data
515 * @param ats_count number of entries in ats (excluding 0-termination)
518 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
519 const char *plugin_name, const void *address,
520 size_t address_len, struct Session *session,
521 const struct GNUNET_TRANSPORT_ATS_Information
522 *ats, uint32_t ats_count)
524 struct NeighbourMapEntry *n;
525 struct GNUNET_MessageHeader connect_msg;
527 GNUNET_assert (neighbours != NULL);
529 n = lookup_neighbour (peer);
537 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
538 "SWITCH! Peer `%4s' switches to plugin `%s' address '%s' session %X\n",
539 GNUNET_i2s (peer), plugin_name,
540 (address_len == 0) ? "<inbound>" : GST_plugins_a2s (plugin_name,
546 GNUNET_free_non_null (n->addr);
547 n->addr = GNUNET_malloc (address_len);
548 memcpy (n->addr, address, address_len);
549 n->addrlen = address_len;
550 n->session = session;
551 GNUNET_array_grow (n->ats, n->ats_count, ats_count);
553 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
554 GNUNET_free_non_null (n->plugin_name);
555 n->plugin_name = GNUNET_strdup (plugin_name);
556 GNUNET_SCHEDULER_cancel (n->timeout_task);
558 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
559 &neighbour_timeout_task, n);
560 connect_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
561 connect_msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
562 GST_neighbours_send (peer, &connect_msg, sizeof (connect_msg),
563 GNUNET_TIME_UNIT_FOREVER_REL, NULL, NULL);
568 * Try to connect to the target peer using the given address
570 * @param cls the 'struct NeighbourMapEntry' of the target
571 * @param target identity of the target peer
572 * @param plugin_name name of the plugin
573 * @param plugin_address binary address
574 * @param plugin_address_len length of address
575 * @param bandwidth available bandwidth
576 * @param ats performance data for the address (as far as known)
577 * @param ats_count number of performance records in 'ats'
580 try_connect_using_address (void *cls, const struct GNUNET_PeerIdentity *target,
581 const char *plugin_name, const void *plugin_address,
582 size_t plugin_address_len, struct Session *session,
583 struct GNUNET_BANDWIDTH_Value32NBO bandwidth,
584 const struct GNUNET_TRANSPORT_ATS_Information *ats,
587 struct NeighbourMapEntry *n = cls;
591 was_connected = n->is_connected;
592 n->is_connected = GNUNET_YES;
593 GST_neighbours_switch_to_address (target, plugin_name, plugin_address,
594 plugin_address_len, session, ats,
596 if (GNUNET_YES == was_connected)
599 neighbours_connected++;
600 GNUNET_STATISTICS_update (GST_stats,
602 ("# peers connected"),
604 connect_notify_cb (callback_cls, target, n->ats, n->ats_count);
609 * Try to create a connection to the given target (eventually).
611 * @param target peer to try to connect to
614 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
616 struct NeighbourMapEntry *n;
618 GNUNET_assert (neighbours != NULL);
621 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Trying to connect to peer `%s'\n",
622 GNUNET_i2s (target));
626 memcmp (target, &GST_my_identity,
627 sizeof (struct GNUNET_PeerIdentity)));
628 n = lookup_neighbour (target);
629 if ((NULL != n) && (GNUNET_YES == n->is_connected))
630 return; /* already connected */
634 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
635 "Unknown peer `%s', creating new neighbour\n",
636 GNUNET_i2s (target));
638 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
640 GNUNET_array_grow (n->ats, n->ats_count, 1);
641 n->ats[0].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);;
642 n->ats[0].value = htonl (0);
643 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
644 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
645 MAX_BANDWIDTH_CARRY_S);
647 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
648 &neighbour_timeout_task, n);
649 GNUNET_assert (GNUNET_OK ==
650 GNUNET_CONTAINER_multihashmap_put (neighbours,
651 &n->id.hashPubKey, n,
652 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
655 return; /* already trying */
657 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
658 "Asking ATS for suggested address to connect to peer `%s'\n",
659 GNUNET_i2s (target));
662 GNUNET_ATS_suggest_address (GST_ats, target, &try_connect_using_address,
668 * Test if we're connected to the given peer.
670 * @param target peer to test
671 * @return GNUNET_YES if we are connected, GNUNET_NO if not
674 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
676 struct NeighbourMapEntry *n;
678 GNUNET_assert (neighbours != NULL);
680 n = lookup_neighbour (target);
681 if ((NULL == n) || (n->is_connected != GNUNET_YES))
682 return GNUNET_NO; /* not connected */
688 * A session was terminated. Take note.
690 * @param peer identity of the peer where the session died
691 * @param session session that is gone
694 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
695 struct Session *session)
697 struct NeighbourMapEntry *n;
699 GNUNET_assert (neighbours != NULL);
701 n = lookup_neighbour (peer);
704 if (session != n->session)
705 return; /* doesn't affect us */
707 if (GNUNET_YES != n->is_connected)
708 return; /* not connected anymore anyway, shouldn't matter */
710 GNUNET_SCHEDULER_cancel (n->timeout_task);
712 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
713 &neighbour_timeout_task, n);
714 /* try QUICKLY to re-establish a connection, reduce timeout! */
717 /* how can this be!? */
722 GNUNET_ATS_suggest_address (GST_ats, peer, &try_connect_using_address, n);
727 * Transmit a message to the given target using the active connection.
729 * @param target destination
730 * @param msg message to send
731 * @param msg_size number of bytes in msg
732 * @param timeout when to fail with timeout
733 * @param cont function to call when done
734 * @param cont_cls closure for 'cont'
737 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
738 size_t msg_size, struct GNUNET_TIME_Relative timeout,
739 GST_NeighbourSendContinuation cont, void *cont_cls)
741 struct NeighbourMapEntry *n;
742 struct MessageQueue *mq;
744 GNUNET_assert (neighbours != NULL);
746 n = lookup_neighbour (target);
747 if ((n == NULL) || (GNUNET_YES != n->is_connected))
749 GNUNET_STATISTICS_update (GST_stats,
751 ("# messages not sent (no such peer or not connected)"),
755 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
756 "Could not send message to peer `%s': unknown neighbor",
757 GNUNET_i2s (target));
758 if (GNUNET_YES != n->is_connected)
759 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
760 "Could not send message to peer `%s': not connected\n",
761 GNUNET_i2s (target));
764 cont (cont_cls, GNUNET_SYSERR);
768 GNUNET_assert (msg_size >= sizeof (struct GNUNET_MessageHeader));
769 GNUNET_STATISTICS_update (GST_stats,
771 ("# bytes in message queue for other peers"),
772 msg_size, GNUNET_NO);
773 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
775 mq->cont_cls = cont_cls;
776 /* FIXME: this memcpy can be up to 7% of our total runtime! */
777 memcpy (&mq[1], msg, msg_size);
778 mq->message_buf = (const char *) &mq[1];
779 mq->message_buf_size = msg_size;
780 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
781 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
782 if ((GNUNET_SCHEDULER_NO_TASK == n->transmission_task) &&
783 (NULL == n->is_active))
784 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
789 * We have received a message from the given sender. How long should
790 * we delay before receiving more? (Also used to keep the peer marked
793 * @param sender sender of the message
794 * @param size size of the message
795 * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
796 * GNUNET_NO if the neighbour is not connected or violates the quota
797 * @return how long to wait before reading more from this sender
799 struct GNUNET_TIME_Relative
800 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
801 *sender, ssize_t size, int *do_forward)
803 struct NeighbourMapEntry *n;
804 struct GNUNET_TIME_Relative ret;
806 GNUNET_assert (neighbours != NULL);
808 n = lookup_neighbour (sender);
811 *do_forward = GNUNET_NO;
812 return GNUNET_TIME_UNIT_ZERO;
814 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
816 n->quota_violation_count++;
818 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
819 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
820 n->in_tracker.available_bytes_per_s__,
821 n->quota_violation_count);
823 /* Discount 32k per violation */
824 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
828 if (n->quota_violation_count > 0)
830 /* try to add 32k back */
831 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
832 n->quota_violation_count--;
835 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
837 GNUNET_STATISTICS_update (GST_stats,
839 ("# bandwidth quota violations by other peers"),
841 *do_forward = GNUNET_NO;
842 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
844 *do_forward = GNUNET_YES;
845 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
846 if (ret.rel_value > 0)
849 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
850 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
851 (unsigned long long) n->in_tracker.
852 consumption_since_last_update__,
853 (unsigned int) n->in_tracker.available_bytes_per_s__,
854 (unsigned long long) ret.rel_value);
856 GNUNET_STATISTICS_update (GST_stats,
857 gettext_noop ("# ms throttling suggested"),
858 (int64_t) ret.rel_value, GNUNET_NO);
865 * Keep the connection to the given neighbour alive longer,
866 * we received a KEEPALIVE (or equivalent).
868 * @param neighbour neighbour to keep alive
871 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
873 struct NeighbourMapEntry *n;
875 GNUNET_assert (neighbours != NULL);
877 n = lookup_neighbour (neighbour);
880 GNUNET_STATISTICS_update (GST_stats,
882 ("# KEEPALIVE messages discarded (not connected)"),
886 GNUNET_SCHEDULER_cancel (n->timeout_task);
888 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
889 &neighbour_timeout_task, n);
894 * Change the incoming quota for the given peer.
896 * @param neighbour identity of peer to change qutoa for
897 * @param quota new quota
900 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
901 struct GNUNET_BANDWIDTH_Value32NBO quota)
903 struct NeighbourMapEntry *n;
905 GNUNET_assert (neighbours != NULL);
907 n = lookup_neighbour (neighbour);
910 GNUNET_STATISTICS_update (GST_stats,
912 ("# SET QUOTA messages ignored (no such peer)"),
916 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
917 if (0 != ntohl (quota.value__))
920 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
921 GNUNET_i2s (&n->id), "SET_QUOTA");
923 GNUNET_STATISTICS_update (GST_stats,
924 gettext_noop ("# disconnects due to quota of 0"), 1,
926 disconnect_neighbour (n);
931 * Closure for the neighbours_iterate function.
933 struct IteratorContext
936 * Function to call on each connected neighbour.
938 GST_NeighbourIterator cb;
948 * Call the callback from the closure for each connected neighbour.
950 * @param cls the 'struct IteratorContext'
951 * @param key the hash of the public key of the neighbour
952 * @param value the 'struct NeighbourMapEntry'
953 * @return GNUNET_OK (continue to iterate)
956 neighbours_iterate (void *cls, const GNUNET_HashCode * key, void *value)
958 struct IteratorContext *ic = cls;
959 struct NeighbourMapEntry *n = value;
961 if (GNUNET_YES != n->is_connected)
964 GNUNET_assert (n->ats_count > 0);
965 ic->cb (ic->cb_cls, &n->id, n->ats, n->ats_count);
971 * Iterate over all connected neighbours.
973 * @param cb function to call
974 * @param cb_cls closure for cb
977 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
979 struct IteratorContext ic;
981 GNUNET_assert (neighbours != NULL);
985 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
990 * If we have an active connection to the given target, it must be shutdown.
992 * @param target peer to disconnect from
995 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
997 struct NeighbourMapEntry *n;
998 struct GNUNET_TRANSPORT_PluginFunctions *papi;
999 struct GNUNET_MessageHeader disconnect_msg;
1001 GNUNET_assert (neighbours != NULL);
1003 n = lookup_neighbour (target);
1005 return; /* not active */
1006 if (GNUNET_YES == n->is_connected)
1008 /* we're actually connected, send DISCONNECT message */
1009 disconnect_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
1010 disconnect_msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
1011 papi = GST_plugins_find (n->plugin_name);
1013 papi->send (papi->cls, target, (const void *) &disconnect_msg,
1014 sizeof (struct GNUNET_MessageHeader),
1015 UINT32_MAX /* priority */ ,
1016 GNUNET_TIME_UNIT_FOREVER_REL, n->session, n->addr, n->addrlen,
1017 GNUNET_YES, NULL, NULL);
1019 disconnect_neighbour (n);
1023 /* end of file gnunet-service-transport_neighbours.c */