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
49 * How often do we send KEEPALIVE messages to each of our neighbours?
50 * (idle timeout is 5 minutes or 300 seconds, so with 90s interval we
51 * send 3 keepalives in each interval, so 3 messages would need to be
52 * lost in a row for a disconnect).
54 #define KEEPALIVE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 90)
58 * Entry in neighbours.
60 struct NeighbourMapEntry;
63 * Message a peer sends to another to indicate its
64 * preference for communicating via a particular
65 * session (and the desire to establish a real
68 struct SessionConnectMessage
71 * Header of type 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT'
73 struct GNUNET_MessageHeader header;
78 uint32_t reserved GNUNET_PACKED;
81 * Absolute time at the sender. Only the most recent connect
82 * message implies which session is preferred by the sender.
84 struct GNUNET_TIME_AbsoluteNBO timestamp;
89 struct SessionDisconnectMessage
92 * Header of type 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT'
94 struct GNUNET_MessageHeader header;
99 uint32_t reserved GNUNET_PACKED;
102 * Purpose of the signature. Extends over the timestamp.
103 * Purpose should be GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DISCONNECT.
105 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
108 * Absolute time at the sender. Only the most recent connect
109 * message implies which session is preferred by the sender.
111 struct GNUNET_TIME_AbsoluteNBO timestamp;
114 * Signature of the peer that sends us the disconnect. Only
115 * valid if the timestamp is AFTER the timestamp from the
116 * corresponding 'CONNECT' message.
118 struct GNUNET_CRYPTO_RsaSignature signature;
123 * For each neighbour we keep a list of messages
124 * that we still want to transmit to the neighbour.
130 * This is a doubly linked list.
132 struct MessageQueue *next;
135 * This is a doubly linked list.
137 struct MessageQueue *prev;
140 * Once this message is actively being transmitted, which
141 * neighbour is it associated with?
143 struct NeighbourMapEntry *n;
146 * Function to call once we're done.
148 GST_NeighbourSendContinuation cont;
156 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
157 * stuck together in memory. Allocated at the end of this struct.
159 const char *message_buf;
162 * Size of the message buf
164 size_t message_buf_size;
167 * At what time should we fail?
169 struct GNUNET_TIME_Absolute timeout;
175 * Entry in neighbours.
177 struct NeighbourMapEntry
181 * Head of list of messages we would like to send to this peer;
182 * must contain at most one message per client.
184 struct MessageQueue *messages_head;
187 * Tail of list of messages we would like to send to this peer; must
188 * contain at most one message per client.
190 struct MessageQueue *messages_tail;
193 * Context for address suggestion.
194 * NULL after we are connected.
196 struct GNUNET_ATS_SuggestionContext *asc;
199 * Performance data for the peer.
201 struct GNUNET_TRANSPORT_ATS_Information *ats;
204 * Are we currently trying to send a message? If so, which one?
206 struct MessageQueue *is_active;
209 * Active session for communicating with the peer.
211 struct Session *session;
214 * Name of the plugin we currently use.
219 * Address used for communicating with the peer, NULL for inbound connections.
224 * Number of bytes in 'addr'.
229 * Identity of this neighbour.
231 struct GNUNET_PeerIdentity id;
234 * ID of task scheduled to run when this peer is about to
235 * time out (will free resources associated with the peer).
237 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
240 * ID of task scheduled to send keepalives.
242 GNUNET_SCHEDULER_TaskIdentifier keepalive_task;
245 * ID of task scheduled to run when we should try transmitting
246 * the head of the message queue.
248 GNUNET_SCHEDULER_TaskIdentifier transmission_task;
251 * Tracker for inbound bandwidth.
253 struct GNUNET_BANDWIDTH_Tracker in_tracker;
256 * How often has the other peer (recently) violated the inbound
257 * traffic limit? Incremented by 10 per violation, decremented by 1
258 * per non-violation (for each time interval).
260 unsigned int quota_violation_count;
263 * Number of values in 'ats' array.
265 unsigned int ats_count;
268 * Are we already in the process of disconnecting this neighbour?
273 * Do we currently consider this neighbour connected? (as far as
274 * the connect/disconnect callbacks are concerned)?
282 * All known neighbours and their HELLOs.
284 static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
287 * Closure for connect_notify_cb and disconnect_notify_cb
289 static void *callback_cls;
292 * Function to call when we connected to a neighbour.
294 static GNUNET_TRANSPORT_NotifyConnect connect_notify_cb;
297 * Function to call when we disconnected from a neighbour.
299 static GNUNET_TRANSPORT_NotifyDisconnect disconnect_notify_cb;
302 * counter for connected neighbours
304 static int neighbours_connected;
307 * Lookup a neighbour entry in the neighbours hash map.
309 * @param pid identity of the peer to look up
310 * @return the entry, NULL if there is no existing record
312 static struct NeighbourMapEntry *
313 lookup_neighbour (const struct GNUNET_PeerIdentity *pid)
315 return GNUNET_CONTAINER_multihashmap_get (neighbours, &pid->hashPubKey);
320 * Task invoked to start a transmission to another peer.
322 * @param cls the 'struct NeighbourMapEntry'
323 * @param tc scheduler context
326 transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
330 * We're done with our transmission attempt, continue processing.
332 * @param cls the 'struct MessageQueue' of the message
333 * @param receiver intended receiver
334 * @param success whether it worked or not
337 transmit_send_continuation (void *cls,
338 const struct GNUNET_PeerIdentity *receiver,
341 struct MessageQueue *mq;
342 struct NeighbourMapEntry *n;
348 GNUNET_assert (n->is_active == mq);
350 GNUNET_assert (n->transmission_task == GNUNET_SCHEDULER_NO_TASK);
351 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
353 if (NULL != mq->cont)
354 mq->cont (mq->cont_cls, success);
360 * Check the ready list for the given neighbour and if a plugin is
361 * ready for transmission (and if we have a message), do so!
363 * @param n target peer for which to transmit
366 try_transmission_to_peer (struct NeighbourMapEntry *n)
368 struct MessageQueue *mq;
369 struct GNUNET_TIME_Relative timeout;
371 struct GNUNET_TRANSPORT_PluginFunctions *papi;
373 if (n->is_active != NULL)
374 return; /* transmission already pending */
375 if (n->transmission_task != GNUNET_SCHEDULER_NO_TASK)
376 return; /* currently waiting for bandwidth */
377 while (NULL != (mq = n->messages_head))
379 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
380 if (timeout.rel_value > 0)
382 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
384 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR); /* timeout */
387 return; /* no more messages */
389 papi = GST_plugins_find (n->plugin_name);
395 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
399 if (((n->session == NULL) && (n->addr == NULL) && (n->addrlen == 0)))
401 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No address peer for peer `%s'\n",
402 GNUNET_i2s (&n->id));
403 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);
404 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
409 papi->send (papi->cls, &n->id, mq->message_buf, mq->message_buf_size,
410 0 /* priority -- remove from plugin API? */ ,
411 timeout, n->session, n->addr, n->addrlen, GNUNET_YES,
412 &transmit_send_continuation, mq);
415 /* failure, but 'send' would not call continuation in this case,
416 * so we need to do it here! */
417 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);
418 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
424 * Task invoked to start a transmission to another peer.
426 * @param cls the 'struct NeighbourMapEntry'
427 * @param tc scheduler context
430 transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
432 struct NeighbourMapEntry *n = cls;
434 n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
435 try_transmission_to_peer (n);
440 * Initialize the neighbours subsystem.
442 * @param cls closure for callbacks
443 * @param connect_cb function to call if we connect to a peer
444 * @param disconnect_cb function to call if we disconnect from a peer
447 GST_neighbours_start (void *cls, GNUNET_TRANSPORT_NotifyConnect connect_cb,
448 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb)
451 connect_notify_cb = connect_cb;
452 disconnect_notify_cb = disconnect_cb;
453 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
458 * Disconnect from the given neighbour, clean up the record.
460 * @param n neighbour to disconnect from
463 disconnect_neighbour (struct NeighbourMapEntry *n)
465 struct MessageQueue *mq;
467 if (GNUNET_YES == n->in_disconnect)
469 n->in_disconnect = GNUNET_YES;
470 while (NULL != (mq = n->messages_head))
472 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
473 if (NULL != mq->cont)
474 mq->cont (mq->cont_cls, GNUNET_SYSERR);
477 if (NULL != n->is_active)
479 n->is_active->n = NULL;
482 if (GNUNET_YES == n->is_connected)
484 n->is_connected = GNUNET_NO;
485 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != n->keepalive_task);
486 GNUNET_SCHEDULER_cancel (n->keepalive_task);
487 n->keepalive_task = GNUNET_SCHEDULER_NO_TASK;
488 GNUNET_assert (neighbours_connected > 0);
489 neighbours_connected--;
490 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# peers connected"), -1,
492 disconnect_notify_cb (callback_cls, &n->id);
494 GNUNET_assert (GNUNET_YES ==
495 GNUNET_CONTAINER_multihashmap_remove (neighbours,
496 &n->id.hashPubKey, n));
497 if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
499 GNUNET_SCHEDULER_cancel (n->timeout_task);
500 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
502 if (GNUNET_SCHEDULER_NO_TASK != n->transmission_task)
504 GNUNET_SCHEDULER_cancel (n->transmission_task);
505 n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
509 GNUNET_ATS_suggest_address_cancel (n->asc);
512 GNUNET_array_grow (n->ats, n->ats_count, 0);
513 if (NULL != n->plugin_name)
515 GNUNET_free (n->plugin_name);
516 n->plugin_name = NULL;
520 GNUNET_free (n->addr);
530 * Peer has been idle for too long. Disconnect.
532 * @param cls the 'struct NeighbourMapEntry' of the neighbour that went idle
533 * @param tc scheduler context
536 neighbour_timeout_task (void *cls,
537 const struct GNUNET_SCHEDULER_TaskContext *tc)
539 struct NeighbourMapEntry *n = cls;
541 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
542 if (GNUNET_YES == n->is_connected)
543 GNUNET_STATISTICS_update (GST_stats,
544 gettext_noop ("# peers disconnected due to timeout"), 1,
546 disconnect_neighbour (n);
551 * Send another keepalive message.
553 * @param cls the 'struct NeighbourMapEntry' of the neighbour that went idle
554 * @param tc scheduler context
557 neighbour_keepalive_task (void *cls,
558 const struct GNUNET_SCHEDULER_TaskContext *tc)
560 struct NeighbourMapEntry *n = cls;
561 struct GNUNET_MessageHeader m;
562 struct GNUNET_TRANSPORT_PluginFunctions *papi;
564 n->keepalive_task = GNUNET_SCHEDULER_NO_TASK;
565 GNUNET_assert (GNUNET_YES == n->is_connected);
566 GNUNET_STATISTICS_update (GST_stats,
567 gettext_noop ("# keepalives sent"), 1,
569 m.size = htons (sizeof (struct GNUNET_MessageHeader));
570 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
571 papi = GST_plugins_find (n->plugin_name);
573 papi->send (papi->cls,
574 &n->id, (const void *) &m,
576 UINT32_MAX /* priority */ ,
577 GNUNET_TIME_UNIT_FOREVER_REL, n->session, n->addr, n->addrlen,
578 GNUNET_YES, NULL, NULL);
579 n->keepalive_task = GNUNET_SCHEDULER_add_delayed (KEEPALIVE_FREQUENCY,
580 &neighbour_keepalive_task,
586 * Disconnect from the given neighbour.
589 * @param key hash of neighbour's public key (not used)
590 * @param value the 'struct NeighbourMapEntry' of the neighbour
593 disconnect_all_neighbours (void *cls, const GNUNET_HashCode * key, void *value)
595 struct NeighbourMapEntry *n = value;
598 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s', %s\n",
599 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
601 if (GNUNET_YES == n->is_connected)
602 GNUNET_STATISTICS_update (GST_stats,
603 gettext_noop ("# peers disconnected due to global disconnect"), 1,
605 disconnect_neighbour (n);
611 * Cleanup the neighbours subsystem.
614 GST_neighbours_stop ()
616 GNUNET_assert (neighbours != NULL);
618 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &disconnect_all_neighbours,
620 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
621 GNUNET_assert (neighbours_connected == 0);
624 connect_notify_cb = NULL;
625 disconnect_notify_cb = NULL;
630 * For an existing neighbour record, set the active connection to
633 * @param peer identity of the peer to switch the address for
634 * @param plugin_name name of transport that delivered the PONG
635 * @param address address of the other peer, NULL if other peer
637 * @param address_len number of bytes in address
638 * @param session session to use (or NULL)
639 * @param ats performance data
640 * @param ats_count number of entries in ats (excluding 0-termination)
643 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
644 const char *plugin_name, const void *address,
645 size_t address_len, struct Session *session,
646 const struct GNUNET_TRANSPORT_ATS_Information
647 *ats, uint32_t ats_count)
649 struct NeighbourMapEntry *n;
650 struct SessionConnectMessage connect_msg;
652 GNUNET_assert (neighbours != NULL);
654 n = lookup_neighbour (peer);
662 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
663 "SWITCH! Peer `%4s' switches to plugin `%s' address '%s' session %X\n",
664 GNUNET_i2s (peer), plugin_name,
665 (address_len == 0) ? "<inbound>" : GST_plugins_a2s (plugin_name,
671 GNUNET_free_non_null (n->addr);
672 n->addr = GNUNET_malloc (address_len);
673 memcpy (n->addr, address, address_len);
674 n->addrlen = address_len;
675 n->session = session;
676 GNUNET_array_grow (n->ats, n->ats_count, ats_count);
678 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
679 GNUNET_free_non_null (n->plugin_name);
680 n->plugin_name = GNUNET_strdup (plugin_name);
681 GNUNET_SCHEDULER_cancel (n->timeout_task);
683 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
684 &neighbour_timeout_task, n);
685 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
686 connect_msg.header.type =
687 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
688 connect_msg.reserved = htonl (0);
689 connect_msg.timestamp =
690 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
691 GST_neighbours_send (peer, &connect_msg, sizeof (connect_msg),
692 GNUNET_TIME_UNIT_FOREVER_REL, NULL, NULL);
697 * Try to connect to the target peer using the given address
699 * @param cls the 'struct NeighbourMapEntry' of the target
700 * @param target identity of the target peer
701 * @param plugin_name name of the plugin
702 * @param plugin_address binary address
703 * @param plugin_address_len length of address
704 * @param session session to use
705 * @param bandwidth available bandwidth
706 * @param ats performance data for the address (as far as known)
707 * @param ats_count number of performance records in 'ats'
710 try_connect_using_address (void *cls, const struct GNUNET_PeerIdentity *target,
711 const char *plugin_name, const void *plugin_address,
712 size_t plugin_address_len, struct Session *session,
713 struct GNUNET_BANDWIDTH_Value32NBO bandwidth,
714 const struct GNUNET_TRANSPORT_ATS_Information *ats,
717 struct NeighbourMapEntry *n = cls;
721 was_connected = n->is_connected;
722 n->is_connected = GNUNET_YES;
723 GST_neighbours_switch_to_address (target, plugin_name, plugin_address,
724 plugin_address_len, session, ats,
726 if (GNUNET_YES == was_connected)
728 n->keepalive_task = GNUNET_SCHEDULER_add_now (&neighbour_keepalive_task,
730 neighbours_connected++;
731 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# peers connected"), 1,
733 connect_notify_cb (callback_cls, target, n->ats, n->ats_count);
738 * Try to create a connection to the given target (eventually).
740 * @param target peer to try to connect to
743 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
745 struct NeighbourMapEntry *n;
747 GNUNET_assert (neighbours != NULL);
750 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Trying to connect to peer `%s'\n",
751 GNUNET_i2s (target));
755 memcmp (target, &GST_my_identity,
756 sizeof (struct GNUNET_PeerIdentity)));
757 n = lookup_neighbour (target);
758 if ((NULL != n) && (GNUNET_YES == n->is_connected))
759 return; /* already connected */
763 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
764 "Unknown peer `%s', creating new neighbour\n",
765 GNUNET_i2s (target));
767 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
769 GNUNET_array_grow (n->ats, n->ats_count, 1);
770 n->ats[0].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);;
771 n->ats[0].value = htonl (0);
772 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
773 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
774 MAX_BANDWIDTH_CARRY_S);
776 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
777 &neighbour_timeout_task, n);
778 GNUNET_assert (GNUNET_OK ==
779 GNUNET_CONTAINER_multihashmap_put (neighbours,
780 &n->id.hashPubKey, n,
781 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
784 return; /* already trying */
786 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
787 "Asking ATS for suggested address to connect to peer `%s'\n",
788 GNUNET_i2s (target));
791 GNUNET_ATS_suggest_address (GST_ats, target, &try_connect_using_address,
797 * Test if we're connected to the given peer.
799 * @param target peer to test
800 * @return GNUNET_YES if we are connected, GNUNET_NO if not
803 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
805 struct NeighbourMapEntry *n;
807 GNUNET_assert (neighbours != NULL);
809 n = lookup_neighbour (target);
810 if ((NULL == n) || (n->is_connected != GNUNET_YES))
811 return GNUNET_NO; /* not connected */
817 * A session was terminated. Take note.
819 * @param peer identity of the peer where the session died
820 * @param session session that is gone
823 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
824 struct Session *session)
826 struct NeighbourMapEntry *n;
828 GNUNET_assert (neighbours != NULL);
831 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
832 "Session %X to peer `%s' ended \n",
833 session, GNUNET_i2s (peer));
836 n = lookup_neighbour (peer);
839 if (session != n->session)
840 return; /* doesn't affect us */
843 GNUNET_free (n->addr);
848 if (GNUNET_YES != n->is_connected)
849 return; /* not connected anymore anyway, shouldn't matter */
851 //n->is_connected = GNUNET_NO;
853 /* fast disconnect unless ATS suggests a new address */
854 GNUNET_SCHEDULER_cancel (n->timeout_task);
856 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
857 &neighbour_timeout_task, n);
858 /* try QUICKLY to re-establish a connection, reduce timeout! */
861 /* how can this be!? */
866 GNUNET_ATS_suggest_address (GST_ats, peer, &try_connect_using_address, n);
871 * Transmit a message to the given target using the active connection.
873 * @param target destination
874 * @param msg message to send
875 * @param msg_size number of bytes in msg
876 * @param timeout when to fail with timeout
877 * @param cont function to call when done
878 * @param cont_cls closure for 'cont'
881 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
882 size_t msg_size, struct GNUNET_TIME_Relative timeout,
883 GST_NeighbourSendContinuation cont, void *cont_cls)
885 struct NeighbourMapEntry *n;
886 struct MessageQueue *mq;
888 GNUNET_assert (neighbours != NULL);
890 n = lookup_neighbour (target);
891 if ((n == NULL) || (GNUNET_YES != n->is_connected))
893 GNUNET_STATISTICS_update (GST_stats,
895 ("# messages not sent (no such peer or not connected)"),
899 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
900 "Could not send message to peer `%s': unknown neighbor",
901 GNUNET_i2s (target));
902 else if (GNUNET_YES != n->is_connected)
903 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
904 "Could not send message to peer `%s': not connected\n",
905 GNUNET_i2s (target));
908 cont (cont_cls, GNUNET_SYSERR);
912 if ((n->session == NULL) && (n->addr == NULL) && (n->addrlen ==0))
914 GNUNET_STATISTICS_update (GST_stats,
916 ("# messages not sent (no such peer or not connected)"),
919 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
920 "Could not send message to peer `%s': no address available\n",
921 GNUNET_i2s (target));
925 cont (cont_cls, GNUNET_SYSERR);
930 GNUNET_assert (msg_size >= sizeof (struct GNUNET_MessageHeader));
931 GNUNET_STATISTICS_update (GST_stats,
933 ("# bytes in message queue for other peers"),
934 msg_size, GNUNET_NO);
935 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
937 mq->cont_cls = cont_cls;
938 /* FIXME: this memcpy can be up to 7% of our total runtime! */
939 memcpy (&mq[1], msg, msg_size);
940 mq->message_buf = (const char *) &mq[1];
941 mq->message_buf_size = msg_size;
942 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
943 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
944 if ((GNUNET_SCHEDULER_NO_TASK == n->transmission_task) &&
945 (NULL == n->is_active))
946 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
951 * We have received a message from the given sender. How long should
952 * we delay before receiving more? (Also used to keep the peer marked
955 * @param sender sender of the message
956 * @param size size of the message
957 * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
958 * GNUNET_NO if the neighbour is not connected or violates the quota
959 * @return how long to wait before reading more from this sender
961 struct GNUNET_TIME_Relative
962 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
963 *sender, ssize_t size, int *do_forward)
965 struct NeighbourMapEntry *n;
966 struct GNUNET_TIME_Relative ret;
968 GNUNET_assert (neighbours != NULL);
970 n = lookup_neighbour (sender);
973 *do_forward = GNUNET_NO;
974 return GNUNET_TIME_UNIT_ZERO;
976 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
978 n->quota_violation_count++;
980 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
981 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
982 n->in_tracker.available_bytes_per_s__,
983 n->quota_violation_count);
985 /* Discount 32k per violation */
986 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
990 if (n->quota_violation_count > 0)
992 /* try to add 32k back */
993 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
994 n->quota_violation_count--;
997 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
999 GNUNET_STATISTICS_update (GST_stats,
1001 ("# bandwidth quota violations by other peers"),
1003 *do_forward = GNUNET_NO;
1004 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
1006 *do_forward = GNUNET_YES;
1007 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
1008 if (ret.rel_value > 0)
1011 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1012 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
1013 (unsigned long long) n->in_tracker.
1014 consumption_since_last_update__,
1015 (unsigned int) n->in_tracker.available_bytes_per_s__,
1016 (unsigned long long) ret.rel_value);
1018 GNUNET_STATISTICS_update (GST_stats,
1019 gettext_noop ("# ms throttling suggested"),
1020 (int64_t) ret.rel_value, GNUNET_NO);
1027 * Keep the connection to the given neighbour alive longer,
1028 * we received a KEEPALIVE (or equivalent).
1030 * @param neighbour neighbour to keep alive
1033 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
1035 struct NeighbourMapEntry *n;
1037 GNUNET_assert (neighbours != NULL);
1039 n = lookup_neighbour (neighbour);
1042 GNUNET_STATISTICS_update (GST_stats,
1044 ("# KEEPALIVE messages discarded (not connected)"),
1048 GNUNET_SCHEDULER_cancel (n->timeout_task);
1050 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1051 &neighbour_timeout_task, n);
1056 * Change the incoming quota for the given peer.
1058 * @param neighbour identity of peer to change qutoa for
1059 * @param quota new quota
1062 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
1063 struct GNUNET_BANDWIDTH_Value32NBO quota)
1065 struct NeighbourMapEntry *n;
1067 GNUNET_assert (neighbours != NULL);
1069 n = lookup_neighbour (neighbour);
1072 GNUNET_STATISTICS_update (GST_stats,
1074 ("# SET QUOTA messages ignored (no such peer)"),
1078 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
1079 if (0 != ntohl (quota.value__))
1082 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
1083 GNUNET_i2s (&n->id), "SET_QUOTA");
1085 if (GNUNET_YES == n->is_connected)
1086 GNUNET_STATISTICS_update (GST_stats,
1087 gettext_noop ("# disconnects due to quota of 0"), 1,
1089 disconnect_neighbour (n);
1094 * Closure for the neighbours_iterate function.
1096 struct IteratorContext
1099 * Function to call on each connected neighbour.
1101 GST_NeighbourIterator cb;
1111 * Call the callback from the closure for each connected neighbour.
1113 * @param cls the 'struct IteratorContext'
1114 * @param key the hash of the public key of the neighbour
1115 * @param value the 'struct NeighbourMapEntry'
1116 * @return GNUNET_OK (continue to iterate)
1119 neighbours_iterate (void *cls, const GNUNET_HashCode * key, void *value)
1121 struct IteratorContext *ic = cls;
1122 struct NeighbourMapEntry *n = value;
1124 if (GNUNET_YES != n->is_connected)
1127 GNUNET_assert (n->ats_count > 0);
1128 ic->cb (ic->cb_cls, &n->id, n->ats, n->ats_count, n->plugin_name, n->addr, n->addrlen);
1134 * Iterate over all connected neighbours.
1136 * @param cb function to call
1137 * @param cb_cls closure for cb
1140 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
1142 struct IteratorContext ic;
1144 GNUNET_assert (neighbours != NULL);
1148 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
1153 * If we have an active connection to the given target, it must be shutdown.
1155 * @param target peer to disconnect from
1158 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
1160 struct NeighbourMapEntry *n;
1161 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1162 struct SessionDisconnectMessage disconnect_msg;
1164 GNUNET_assert (neighbours != NULL);
1166 n = lookup_neighbour (target);
1168 return; /* not active */
1169 if (GNUNET_YES == n->is_connected)
1171 /* we're actually connected, send DISCONNECT message */
1172 disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
1173 disconnect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
1174 disconnect_msg.reserved = htonl (0);
1175 disconnect_msg.purpose.size = htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1176 sizeof (struct GNUNET_TIME_AbsoluteNBO));
1177 disconnect_msg.purpose.purpose = htonl (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1178 disconnect_msg.timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1179 GNUNET_assert (GNUNET_OK ==
1180 GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
1181 &disconnect_msg.purpose,
1182 &disconnect_msg.signature));
1183 papi = GST_plugins_find (n->plugin_name);
1185 papi->send (papi->cls, target, (const void *) &disconnect_msg,
1186 sizeof (disconnect_msg),
1187 UINT32_MAX /* priority */ ,
1188 GNUNET_TIME_UNIT_FOREVER_REL, n->session, n->addr, n->addrlen,
1189 GNUNET_YES, NULL, NULL);
1190 GNUNET_STATISTICS_update (GST_stats,
1191 gettext_noop ("# peers disconnected due to external request"), 1,
1194 disconnect_neighbour (n);
1198 /* end of file gnunet-service-transport_neighbours.c */