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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);
323 papi->send (papi->cls, &n->id, mq->message_buf, mq->message_buf_size,
324 0 /* priority -- remove from plugin API? */ ,
325 timeout, n->session, n->addr, n->addrlen, GNUNET_YES,
326 &transmit_send_continuation, mq);
329 /* failure, but 'send' would not call continuation in this case,
330 * so we need to do it here! */
331 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);
332 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
338 * Task invoked to start a transmission to another peer.
340 * @param cls the 'struct NeighbourMapEntry'
341 * @param tc scheduler context
344 transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
346 struct NeighbourMapEntry *n = cls;
348 n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
349 try_transmission_to_peer (n);
354 * Initialize the neighbours subsystem.
356 * @param cls closure for callbacks
357 * @param connect_cb function to call if we connect to a peer
358 * @param disconnect_cb function to call if we disconnect from a peer
361 GST_neighbours_start (void *cls, GNUNET_TRANSPORT_NotifyConnect connect_cb,
362 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb)
365 connect_notify_cb = connect_cb;
366 disconnect_notify_cb = disconnect_cb;
367 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
372 * Disconnect from the given neighbour, clean up the record.
374 * @param n neighbour to disconnect from
377 disconnect_neighbour (struct NeighbourMapEntry *n)
379 struct MessageQueue *mq;
381 if (GNUNET_YES == n->in_disconnect)
383 n->in_disconnect = GNUNET_YES;
384 while (NULL != (mq = n->messages_head))
386 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
387 mq->cont (mq->cont_cls, GNUNET_SYSERR);
390 if (NULL != n->is_active)
392 n->is_active->n = NULL;
395 if (GNUNET_YES == n->is_connected)
397 n->is_connected = GNUNET_NO;
398 disconnect_notify_cb (callback_cls, &n->id);
400 GNUNET_assert (GNUNET_YES ==
401 GNUNET_CONTAINER_multihashmap_remove (neighbours,
402 &n->id.hashPubKey, n));
403 if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
405 GNUNET_SCHEDULER_cancel (n->timeout_task);
406 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
408 if (GNUNET_SCHEDULER_NO_TASK != n->transmission_task)
410 GNUNET_SCHEDULER_cancel (n->timeout_task);
411 n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
415 GNUNET_ATS_suggest_address_cancel (n->asc);
418 GNUNET_array_grow (n->ats, n->ats_count, 0);
419 if (NULL != n->plugin_name)
421 GNUNET_free (n->plugin_name);
422 n->plugin_name = NULL;
426 GNUNET_free (n->addr);
436 * Peer has been idle for too long. Disconnect.
438 * @param cls the 'struct NeighbourMapEntry' of the neighbour that went idle
439 * @param tc scheduler context
442 neighbour_timeout_task (void *cls,
443 const struct GNUNET_SCHEDULER_TaskContext *tc)
445 struct NeighbourMapEntry *n = cls;
447 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
448 disconnect_neighbour (n);
453 * Disconnect from the given neighbour.
456 * @param key hash of neighbour's public key (not used)
457 * @param value the 'struct NeighbourMapEntry' of the neighbour
460 disconnect_all_neighbours (void *cls, const GNUNET_HashCode * key, void *value)
462 struct NeighbourMapEntry *n = value;
465 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s', %s\n",
466 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
468 disconnect_neighbour (n);
474 * Cleanup the neighbours subsystem.
477 GST_neighbours_stop ()
479 GNUNET_assert (neighbours != NULL);
481 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &disconnect_all_neighbours,
483 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
486 connect_notify_cb = NULL;
487 disconnect_notify_cb = NULL;
492 * For an existing neighbour record, set the active connection to
495 * @param peer identity of the peer to switch the address for
496 * @param plugin_name name of transport that delivered the PONG
497 * @param address address of the other peer, NULL if other peer
499 * @param address_len number of bytes in address
500 * @param session session to use (or NULL)
501 * @param ats performance data
502 * @param ats_count number of entries in ats (excluding 0-termination)
505 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
506 const char *plugin_name, const void *address,
507 size_t address_len, struct Session *session,
508 const struct GNUNET_TRANSPORT_ATS_Information
509 *ats, uint32_t ats_count)
511 struct NeighbourMapEntry *n;
512 struct GNUNET_MessageHeader connect_msg;
514 GNUNET_assert (neighbours != NULL);
516 n = lookup_neighbour (peer);
524 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
525 "SWITCH! Peer `%4s' switches to plugin `%s' address '%s' session %X\n",
526 GNUNET_i2s (peer), plugin_name,
527 (address_len == 0) ? "<inbound>" : GST_plugins_a2s (plugin_name,
533 GNUNET_free_non_null (n->addr);
534 n->addr = GNUNET_malloc (address_len);
535 memcpy (n->addr, address, address_len);
536 n->addrlen = address_len;
537 n->session = session;
538 GNUNET_array_grow (n->ats, n->ats_count, ats_count);
540 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
541 GNUNET_free_non_null (n->plugin_name);
542 n->plugin_name = GNUNET_strdup (plugin_name);
543 GNUNET_SCHEDULER_cancel (n->timeout_task);
545 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
546 &neighbour_timeout_task, n);
547 connect_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
548 connect_msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
549 GST_neighbours_send (peer, &connect_msg, sizeof (connect_msg),
550 GNUNET_TIME_UNIT_FOREVER_REL, NULL, NULL);
555 * Try to connect to the target peer using the given address
557 * @param cls the 'struct NeighbourMapEntry' of the target
558 * @param target identity of the target peer
559 * @param plugin_name name of the plugin
560 * @param plugin_address binary address
561 * @param plugin_address_len length of address
562 * @param bandwidth available bandwidth
563 * @param ats performance data for the address (as far as known)
564 * @param ats_count number of performance records in 'ats'
567 try_connect_using_address (void *cls, const struct GNUNET_PeerIdentity *target,
568 const char *plugin_name, const void *plugin_address,
569 size_t plugin_address_len, struct Session *session,
570 struct GNUNET_BANDWIDTH_Value32NBO bandwidth,
571 const struct GNUNET_TRANSPORT_ATS_Information *ats,
574 struct NeighbourMapEntry *n = cls;
578 was_connected = n->is_connected;
579 n->is_connected = GNUNET_YES;
580 GST_neighbours_switch_to_address (target, plugin_name, plugin_address,
581 plugin_address_len, session, ats,
583 if (GNUNET_YES == was_connected)
585 connect_notify_cb (callback_cls, target, n->ats, n->ats_count);
590 * Try to create a connection to the given target (eventually).
592 * @param target peer to try to connect to
595 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
597 struct NeighbourMapEntry *n;
599 GNUNET_assert (neighbours != NULL);
602 memcmp (target, &GST_my_identity,
603 sizeof (struct GNUNET_PeerIdentity)));
604 n = lookup_neighbour (target);
605 if ((NULL != n) && (GNUNET_YES == n->is_connected))
606 return; /* already connected */
609 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
611 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
612 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
613 MAX_BANDWIDTH_CARRY_S);
615 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
616 &neighbour_timeout_task, n);
617 GNUNET_assert (GNUNET_OK ==
618 GNUNET_CONTAINER_multihashmap_put (neighbours,
619 &n->id.hashPubKey, n,
620 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
623 return; /* already trying */
625 GNUNET_ATS_suggest_address (GST_ats, target, &try_connect_using_address,
631 * Test if we're connected to the given peer.
633 * @param target peer to test
634 * @return GNUNET_YES if we are connected, GNUNET_NO if not
637 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
639 struct NeighbourMapEntry *n;
641 GNUNET_assert (neighbours != NULL);
643 n = lookup_neighbour (target);
644 if ((NULL == n) || (n->is_connected != GNUNET_YES))
645 return GNUNET_NO; /* not connected */
651 * A session was terminated. Take note.
653 * @param peer identity of the peer where the session died
654 * @param session session that is gone
657 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
658 struct Session *session)
660 struct NeighbourMapEntry *n;
662 GNUNET_assert (neighbours != NULL);
664 n = lookup_neighbour (peer);
667 if (session != n->session)
668 return; /* doesn't affect us */
670 if (GNUNET_YES != n->is_connected)
671 return; /* not connected anymore anyway, shouldn't matter */
673 GNUNET_SCHEDULER_cancel (n->timeout_task);
675 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
676 &neighbour_timeout_task, n);
677 /* try QUICKLY to re-establish a connection, reduce timeout! */
680 /* how can this be!? */
685 GNUNET_ATS_suggest_address (GST_ats, peer, &try_connect_using_address, n);
690 * Transmit a message to the given target using the active connection.
692 * @param target destination
693 * @param msg message to send
694 * @param msg_size number of bytes in msg
695 * @param timeout when to fail with timeout
696 * @param cont function to call when done
697 * @param cont_cls closure for 'cont'
700 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
701 size_t msg_size, struct GNUNET_TIME_Relative timeout,
702 GST_NeighbourSendContinuation cont, void *cont_cls)
704 struct NeighbourMapEntry *n;
705 struct MessageQueue *mq;
707 GNUNET_assert (neighbours != NULL);
709 n = lookup_neighbour (target);
710 if ((n == NULL) || (GNUNET_YES != n->is_connected))
712 GNUNET_STATISTICS_update (GST_stats,
714 ("# messages not sent (no such peer or not connected)"),
718 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
719 "Could not send message to peer `%s': unknown neighbor",
720 GNUNET_i2s (target));
721 if (GNUNET_YES != n->is_connected)
722 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
723 "Could not send message to peer `%s': not connected\n",
724 GNUNET_i2s (target));
727 cont (cont_cls, GNUNET_SYSERR);
730 GNUNET_assert (msg_size >= sizeof (struct GNUNET_MessageHeader));
731 GNUNET_STATISTICS_update (GST_stats,
733 ("# bytes in message queue for other peers"),
734 msg_size, GNUNET_NO);
735 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
737 mq->cont_cls = cont_cls;
738 /* FIXME: this memcpy can be up to 7% of our total runtime! */
739 memcpy (&mq[1], msg, msg_size);
740 mq->message_buf = (const char *) &mq[1];
741 mq->message_buf_size = msg_size;
742 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
743 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
744 if ((GNUNET_SCHEDULER_NO_TASK == n->transmission_task) &&
745 (NULL == n->is_active))
746 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
751 * We have received a message from the given sender. How long should
752 * we delay before receiving more? (Also used to keep the peer marked
755 * @param sender sender of the message
756 * @param size size of the message
757 * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
758 * GNUNET_NO if the neighbour is not connected or violates the quota
759 * @return how long to wait before reading more from this sender
761 struct GNUNET_TIME_Relative
762 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
763 *sender, ssize_t size, int *do_forward)
765 struct NeighbourMapEntry *n;
766 struct GNUNET_TIME_Relative ret;
768 GNUNET_assert (neighbours != NULL);
770 n = lookup_neighbour (sender);
773 *do_forward = GNUNET_NO;
774 return GNUNET_TIME_UNIT_ZERO;
776 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
778 n->quota_violation_count++;
780 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
781 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
782 n->in_tracker.available_bytes_per_s__,
783 n->quota_violation_count);
785 /* Discount 32k per violation */
786 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
790 if (n->quota_violation_count > 0)
792 /* try to add 32k back */
793 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
794 n->quota_violation_count--;
797 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
799 GNUNET_STATISTICS_update (GST_stats,
801 ("# bandwidth quota violations by other peers"),
803 *do_forward = GNUNET_NO;
804 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
806 *do_forward = GNUNET_YES;
807 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
808 if (ret.rel_value > 0)
811 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
812 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
813 (unsigned long long) n->in_tracker.
814 consumption_since_last_update__,
815 (unsigned int) n->in_tracker.available_bytes_per_s__,
816 (unsigned long long) ret.rel_value);
818 GNUNET_STATISTICS_update (GST_stats,
819 gettext_noop ("# ms throttling suggested"),
820 (int64_t) ret.rel_value, GNUNET_NO);
827 * Keep the connection to the given neighbour alive longer,
828 * we received a KEEPALIVE (or equivalent).
830 * @param neighbour neighbour to keep alive
833 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
835 struct NeighbourMapEntry *n;
837 GNUNET_assert (neighbours != NULL);
839 n = lookup_neighbour (neighbour);
842 GNUNET_STATISTICS_update (GST_stats,
844 ("# KEEPALIVE messages discarded (not connected)"),
848 GNUNET_SCHEDULER_cancel (n->timeout_task);
850 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
851 &neighbour_timeout_task, n);
856 * Change the incoming quota for the given peer.
858 * @param neighbour identity of peer to change qutoa for
859 * @param quota new quota
862 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
863 struct GNUNET_BANDWIDTH_Value32NBO quota)
865 struct NeighbourMapEntry *n;
867 GNUNET_assert (neighbours != NULL);
869 n = lookup_neighbour (neighbour);
872 GNUNET_STATISTICS_update (GST_stats,
874 ("# SET QUOTA messages ignored (no such peer)"),
878 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
879 if (0 != ntohl (quota.value__))
882 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
883 GNUNET_i2s (&n->id), "SET_QUOTA");
885 GNUNET_STATISTICS_update (GST_stats,
886 gettext_noop ("# disconnects due to quota of 0"), 1,
888 disconnect_neighbour (n);
893 * Closure for the neighbours_iterate function.
895 struct IteratorContext
898 * Function to call on each connected neighbour.
900 GST_NeighbourIterator cb;
910 * Call the callback from the closure for each connected neighbour.
912 * @param cls the 'struct IteratorContext'
913 * @param key the hash of the public key of the neighbour
914 * @param value the 'struct NeighbourMapEntry'
915 * @return GNUNET_OK (continue to iterate)
918 neighbours_iterate (void *cls, const GNUNET_HashCode * key, void *value)
920 struct IteratorContext *ic = cls;
921 struct NeighbourMapEntry *n = value;
923 if (GNUNET_YES != n->is_connected)
925 GNUNET_assert (n->ats_count > 0);
926 ic->cb (ic->cb_cls, &n->id, n->ats, n->ats_count - 1);
932 * Iterate over all connected neighbours.
934 * @param cb function to call
935 * @param cb_cls closure for cb
938 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
940 struct IteratorContext ic;
942 GNUNET_assert (neighbours != NULL);
946 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
951 * If we have an active connection to the given target, it must be shutdown.
953 * @param target peer to disconnect from
956 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
958 struct NeighbourMapEntry *n;
959 struct GNUNET_TRANSPORT_PluginFunctions *papi;
960 struct GNUNET_MessageHeader disconnect_msg;
962 GNUNET_assert (neighbours != NULL);
964 n = lookup_neighbour (target);
966 return; /* not active */
967 if (GNUNET_YES == n->is_connected)
969 /* we're actually connected, send DISCONNECT message */
970 disconnect_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
971 disconnect_msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
972 papi = GST_plugins_find (n->plugin_name);
974 papi->send (papi->cls, target, (const void *) &disconnect_msg,
975 sizeof (struct GNUNET_MessageHeader),
976 UINT32_MAX /* priority */ ,
977 GNUNET_TIME_UNIT_FOREVER_REL, n->session, n->addr, n->addrlen,
978 GNUNET_YES, NULL, NULL);
980 disconnect_neighbour (n);
984 /* end of file gnunet-service-transport_neighbours.c */