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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;
231 * Lookup a neighbour entry in the neighbours hash map.
233 * @param pid identity of the peer to look up
234 * @return the entry, NULL if there is no existing record
236 static struct NeighbourMapEntry *
237 lookup_neighbour (const struct GNUNET_PeerIdentity *pid)
239 return GNUNET_CONTAINER_multihashmap_get (neighbours, &pid->hashPubKey);
244 * Task invoked to start a transmission to another peer.
246 * @param cls the 'struct NeighbourMapEntry'
247 * @param tc scheduler context
250 transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
254 * We're done with our transmission attempt, continue processing.
256 * @param cls the 'struct MessageQueue' of the message
257 * @param receiver intended receiver
258 * @param success whether it worked or not
261 transmit_send_continuation (void *cls,
262 const struct GNUNET_PeerIdentity *receiver,
265 struct MessageQueue *mq;
266 struct NeighbourMapEntry *n;
272 GNUNET_assert (n->is_active == mq);
274 GNUNET_assert (n->transmission_task == GNUNET_SCHEDULER_NO_TASK);
275 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
277 if (NULL != mq->cont)
278 mq->cont (mq->cont_cls, success);
284 * Check the ready list for the given neighbour and if a plugin is
285 * ready for transmission (and if we have a message), do so!
287 * @param neighbour target peer for which to transmit
290 try_transmission_to_peer (struct NeighbourMapEntry *n)
292 struct MessageQueue *mq;
293 struct GNUNET_TIME_Relative timeout;
295 struct GNUNET_TRANSPORT_PluginFunctions *papi;
297 if (n->is_active != NULL)
298 return; /* transmission already pending */
299 if (n->transmission_task != GNUNET_SCHEDULER_NO_TASK)
300 return; /* currently waiting for bandwidth */
301 mq = n->messages_head;
302 while (NULL != (mq = n->messages_head))
304 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
305 if (timeout.rel_value > 0)
307 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR); /* timeout */
310 return; /* no more messages */
312 papi = GST_plugins_find (n->plugin_name);
318 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
324 papi->send (papi->cls, &n->id, mq->message_buf, mq->message_buf_size,
325 0 /* priority -- remove from plugin API? */ ,
326 timeout, n->session, n->addr, n->addrlen, GNUNET_YES,
327 &transmit_send_continuation, mq);
330 /* failure, but 'send' would not call continuation in this case,
331 * so we need to do it here! */
332 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);
333 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
339 * Task invoked to start a transmission to another peer.
341 * @param cls the 'struct NeighbourMapEntry'
342 * @param tc scheduler context
345 transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
347 struct NeighbourMapEntry *n = cls;
349 n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
350 try_transmission_to_peer (n);
355 * Initialize the neighbours subsystem.
357 * @param cls closure for callbacks
358 * @param connect_cb function to call if we connect to a peer
359 * @param disconnect_cb function to call if we disconnect from a peer
362 GST_neighbours_start (void *cls, GNUNET_TRANSPORT_NotifyConnect connect_cb,
363 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb)
366 connect_notify_cb = connect_cb;
367 disconnect_notify_cb = disconnect_cb;
368 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
373 * Disconnect from the given neighbour, clean up the record.
375 * @param n neighbour to disconnect from
378 disconnect_neighbour (struct NeighbourMapEntry *n)
380 struct MessageQueue *mq;
382 if (GNUNET_YES == n->in_disconnect)
384 n->in_disconnect = GNUNET_YES;
385 while (NULL != (mq = n->messages_head))
387 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
388 mq->cont (mq->cont_cls, GNUNET_SYSERR);
391 if (NULL != n->is_active)
393 n->is_active->n = NULL;
396 if (GNUNET_YES == n->is_connected)
398 n->is_connected = GNUNET_NO;
399 disconnect_notify_cb (callback_cls, &n->id);
401 GNUNET_assert (GNUNET_YES ==
402 GNUNET_CONTAINER_multihashmap_remove (neighbours,
403 &n->id.hashPubKey, n));
404 if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
406 GNUNET_SCHEDULER_cancel (n->timeout_task);
407 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
409 if (GNUNET_SCHEDULER_NO_TASK != n->transmission_task)
411 GNUNET_SCHEDULER_cancel (n->timeout_task);
412 n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
416 GNUNET_ATS_suggest_address_cancel (n->asc);
419 GNUNET_array_grow (n->ats, n->ats_count, 0);
420 if (NULL != n->plugin_name)
422 GNUNET_free (n->plugin_name);
423 n->plugin_name = NULL;
427 GNUNET_free (n->addr);
437 * Peer has been idle for too long. Disconnect.
439 * @param cls the 'struct NeighbourMapEntry' of the neighbour that went idle
440 * @param tc scheduler context
443 neighbour_timeout_task (void *cls,
444 const struct GNUNET_SCHEDULER_TaskContext *tc)
446 struct NeighbourMapEntry *n = cls;
448 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
449 disconnect_neighbour (n);
454 * Disconnect from the given neighbour.
457 * @param key hash of neighbour's public key (not used)
458 * @param value the 'struct NeighbourMapEntry' of the neighbour
461 disconnect_all_neighbours (void *cls, const GNUNET_HashCode * key, void *value)
463 struct NeighbourMapEntry *n = value;
466 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s', %s\n",
467 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
469 disconnect_neighbour (n);
475 * Cleanup the neighbours subsystem.
478 GST_neighbours_stop ()
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 n = lookup_neighbour (peer);
521 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "SWITCH! Peer `%4s' switches to plugin `%s' address '%s' session %X\n",
524 (address_len == 0) ? "<inbound>" :
525 GST_plugins_a2s(plugin_name,address,address_len),
529 GNUNET_free_non_null (n->addr);
530 n->addr = GNUNET_malloc (address_len);
531 memcpy (n->addr, address, address_len);
532 n->addrlen = address_len;
533 n->session = session;
534 GNUNET_array_grow (n->ats, n->ats_count, ats_count);
536 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
537 GNUNET_free_non_null (n->plugin_name);
538 n->plugin_name = GNUNET_strdup (plugin_name);
539 GNUNET_SCHEDULER_cancel (n->timeout_task);
541 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
542 &neighbour_timeout_task, n);
543 connect_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
544 connect_msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
545 GST_neighbours_send (peer, &connect_msg, sizeof (connect_msg),
546 GNUNET_TIME_UNIT_FOREVER_REL, NULL, NULL);
551 * Try to connect to the target peer using the given address
553 * @param cls the 'struct NeighbourMapEntry' of the target
554 * @param target identity of the target peer
555 * @param plugin_name name of the plugin
556 * @param plugin_address binary address
557 * @param plugin_address_len length of address
558 * @param bandwidth available bandwidth
559 * @param ats performance data for the address (as far as known)
560 * @param ats_count number of performance records in 'ats'
563 try_connect_using_address (void *cls, const struct GNUNET_PeerIdentity *target,
564 const char *plugin_name, const void *plugin_address,
565 size_t plugin_address_len,
566 struct Session *session,
567 struct GNUNET_BANDWIDTH_Value32NBO bandwidth,
568 const struct GNUNET_TRANSPORT_ATS_Information *ats,
571 struct NeighbourMapEntry *n = cls;
574 GST_neighbours_switch_to_address (target, plugin_name, plugin_address,
575 plugin_address_len, session, ats, ats_count);
576 if (GNUNET_YES == n->is_connected)
578 n->is_connected = GNUNET_YES;
579 connect_notify_cb (callback_cls, target, n->ats, n->ats_count);
584 * Try to create a connection to the given target (eventually).
586 * @param target peer to try to connect to
589 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
591 struct NeighbourMapEntry *n;
594 memcmp (target, &GST_my_identity,
595 sizeof (struct GNUNET_PeerIdentity)));
596 n = lookup_neighbour (target);
597 if ((NULL != n) && (GNUNET_YES == n->is_connected))
598 return; /* already connected */
601 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
603 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
604 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
605 MAX_BANDWIDTH_CARRY_S);
607 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
608 &neighbour_timeout_task, n);
609 GNUNET_assert (GNUNET_OK ==
610 GNUNET_CONTAINER_multihashmap_put (neighbours,
611 &n->id.hashPubKey, n,
612 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
615 return; /* already trying */
617 GNUNET_ATS_suggest_address (GST_ats, target, &try_connect_using_address,
623 * Test if we're connected to the given peer.
625 * @param target peer to test
626 * @return GNUNET_YES if we are connected, GNUNET_NO if not
629 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
631 struct NeighbourMapEntry *n;
633 n = lookup_neighbour (target);
634 if ((NULL == n) || (n->is_connected != GNUNET_YES))
635 return GNUNET_NO; /* not connected */
641 * A session was terminated. Take note.
643 * @param peer identity of the peer where the session died
644 * @param session session that is gone
647 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
648 struct Session *session)
650 struct NeighbourMapEntry *n;
652 n = lookup_neighbour (peer);
655 if (session != n->session)
656 return; /* doesn't affect us */
658 if (GNUNET_YES != n->is_connected)
659 return; /* not connected anymore anyway, shouldn't matter */
660 /* try QUICKLY to re-establish a connection, reduce timeout! */
663 /* how can this be!? */
667 GNUNET_SCHEDULER_cancel (n->timeout_task);
669 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
670 &neighbour_timeout_task, n);
672 GNUNET_ATS_suggest_address (GST_ats, peer, &try_connect_using_address, n);
677 * Transmit a message to the given target using the active connection.
679 * @param target destination
680 * @param msg message to send
681 * @param msg_size number of bytes in msg
682 * @param timeout when to fail with timeout
683 * @param cont function to call when done
684 * @param cont_cls closure for 'cont'
687 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
688 size_t msg_size, struct GNUNET_TIME_Relative timeout,
689 GST_NeighbourSendContinuation cont, void *cont_cls)
691 struct NeighbourMapEntry *n;
692 struct MessageQueue *mq;
694 n = lookup_neighbour (target);
695 if ((n == NULL) || (GNUNET_YES != n->is_connected))
697 GNUNET_STATISTICS_update (GST_stats,
699 ("# SET QUOTA messages ignored (no such peer)"),
703 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
704 "Could not send message to peer `%s': unknown neighbor", GNUNET_i2s (target));
705 if (GNUNET_YES != n->is_connected)
706 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
707 "Could not send message to peer `%s': not connected\n", GNUNET_i2s (target));
710 cont (cont_cls, GNUNET_SYSERR);
713 GNUNET_assert (msg_size >= sizeof (struct GNUNET_MessageHeader));
714 GNUNET_STATISTICS_update (GST_stats,
716 ("# bytes in message queue for other peers"),
717 msg_size, GNUNET_NO);
718 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
720 mq->cont_cls = cont_cls;
721 /* FIXME: this memcpy can be up to 7% of our total runtime! */
722 memcpy (&mq[1], msg, msg_size);
723 mq->message_buf = (const char *) &mq[1];
724 mq->message_buf_size = msg_size;
725 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
726 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
727 if ((GNUNET_SCHEDULER_NO_TASK == n->transmission_task) &&
728 (NULL == n->is_active))
729 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
734 * We have received a message from the given sender. How long should
735 * we delay before receiving more? (Also used to keep the peer marked
738 * @param sender sender of the message
739 * @param size size of the message
740 * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
741 * GNUNET_NO if the neighbour is not connected or violates the quota
742 * @return how long to wait before reading more from this sender
744 struct GNUNET_TIME_Relative
745 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
746 *sender, ssize_t size, int *do_forward)
748 struct NeighbourMapEntry *n;
749 struct GNUNET_TIME_Relative ret;
751 n = lookup_neighbour (sender);
754 *do_forward = GNUNET_NO;
755 return GNUNET_TIME_UNIT_ZERO;
757 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
759 n->quota_violation_count++;
761 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
762 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
763 n->in_tracker.available_bytes_per_s__,
764 n->quota_violation_count);
766 /* Discount 32k per violation */
767 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
771 if (n->quota_violation_count > 0)
773 /* try to add 32k back */
774 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
775 n->quota_violation_count--;
778 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
780 GNUNET_STATISTICS_update (GST_stats,
782 ("# bandwidth quota violations by other peers"),
784 *do_forward = GNUNET_NO;
785 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
787 *do_forward = GNUNET_YES;
788 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
789 if (ret.rel_value > 0)
792 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
793 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
794 (unsigned long long) n->
795 in_tracker.consumption_since_last_update__,
796 (unsigned int) n->in_tracker.available_bytes_per_s__,
797 (unsigned long long) ret.rel_value);
799 GNUNET_STATISTICS_update (GST_stats,
800 gettext_noop ("# ms throttling suggested"),
801 (int64_t) ret.rel_value, GNUNET_NO);
808 * Keep the connection to the given neighbour alive longer,
809 * we received a KEEPALIVE (or equivalent).
811 * @param neighbour neighbour to keep alive
814 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
816 struct NeighbourMapEntry *n;
818 n = lookup_neighbour (neighbour);
821 GNUNET_STATISTICS_update (GST_stats,
823 ("# KEEPALIVE messages discarded (not connected)"),
827 GNUNET_SCHEDULER_cancel (n->timeout_task);
829 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
830 &neighbour_timeout_task, n);
835 * Change the incoming quota for the given peer.
837 * @param neighbour identity of peer to change qutoa for
838 * @param quota new quota
841 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
842 struct GNUNET_BANDWIDTH_Value32NBO quota)
844 struct NeighbourMapEntry *n;
846 n = lookup_neighbour (neighbour);
849 GNUNET_STATISTICS_update (GST_stats,
851 ("# SET QUOTA messages ignored (no such peer)"),
855 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
856 if (0 != ntohl (quota.value__))
859 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
860 GNUNET_i2s (&n->id), "SET_QUOTA");
862 GNUNET_STATISTICS_update (GST_stats,
863 gettext_noop ("# disconnects due to quota of 0"), 1,
865 disconnect_neighbour (n);
870 * Closure for the neighbours_iterate function.
872 struct IteratorContext
875 * Function to call on each connected neighbour.
877 GST_NeighbourIterator cb;
887 * Call the callback from the closure for each connected neighbour.
889 * @param cls the 'struct IteratorContext'
890 * @param key the hash of the public key of the neighbour
891 * @param value the 'struct NeighbourMapEntry'
892 * @return GNUNET_OK (continue to iterate)
895 neighbours_iterate (void *cls, const GNUNET_HashCode * key, void *value)
897 struct IteratorContext *ic = cls;
898 struct NeighbourMapEntry *n = value;
900 if (GNUNET_YES != n->is_connected)
902 GNUNET_assert (n->ats_count > 0);
903 ic->cb (ic->cb_cls, &n->id, n->ats, n->ats_count - 1);
909 * Iterate over all connected neighbours.
911 * @param cb function to call
912 * @param cb_cls closure for cb
915 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
917 struct IteratorContext ic;
921 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
926 * If we have an active connection to the given target, it must be shutdown.
928 * @param target peer to disconnect from
931 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
933 struct NeighbourMapEntry *n;
934 struct GNUNET_TRANSPORT_PluginFunctions *papi;
935 struct GNUNET_MessageHeader disconnect_msg;
937 n = lookup_neighbour (target);
939 return; /* not active */
940 if (GNUNET_YES == n->is_connected)
942 /* we're actually connected, send DISCONNECT message */
943 disconnect_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
944 disconnect_msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
945 papi = GST_plugins_find (n->plugin_name);
947 papi->send (papi->cls, target, (const void *) &disconnect_msg,
948 sizeof (struct GNUNET_MessageHeader),
949 UINT32_MAX /* priority */ ,
950 GNUNET_TIME_UNIT_FOREVER_REL, n->session, n->addr, n->addrlen,
951 GNUNET_YES, NULL, NULL);
953 disconnect_neighbour (n);
957 /* end of file gnunet-service-transport_neighbours.c */