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);
383 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR); /* timeout */
386 return; /* no more messages */
388 papi = GST_plugins_find (n->plugin_name);
394 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
398 if (((n->session == NULL) && (n->addr == NULL) && (n->addrlen == 0)))
400 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "No address peer for peer `%s'\n",
401 GNUNET_i2s (&n->id));
402 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);
403 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
408 papi->send (papi->cls, &n->id, mq->message_buf, mq->message_buf_size,
409 0 /* priority -- remove from plugin API? */ ,
410 timeout, n->session, n->addr, n->addrlen, GNUNET_YES,
411 &transmit_send_continuation, mq);
414 /* failure, but 'send' would not call continuation in this case,
415 * so we need to do it here! */
416 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);
417 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
423 * Task invoked to start a transmission to another peer.
425 * @param cls the 'struct NeighbourMapEntry'
426 * @param tc scheduler context
429 transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
431 struct NeighbourMapEntry *n = cls;
433 n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
434 try_transmission_to_peer (n);
439 * Initialize the neighbours subsystem.
441 * @param cls closure for callbacks
442 * @param connect_cb function to call if we connect to a peer
443 * @param disconnect_cb function to call if we disconnect from a peer
446 GST_neighbours_start (void *cls, GNUNET_TRANSPORT_NotifyConnect connect_cb,
447 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb)
450 connect_notify_cb = connect_cb;
451 disconnect_notify_cb = disconnect_cb;
452 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
457 * Disconnect from the given neighbour, clean up the record.
459 * @param n neighbour to disconnect from
462 disconnect_neighbour (struct NeighbourMapEntry *n)
464 struct MessageQueue *mq;
466 if (GNUNET_YES == n->in_disconnect)
468 n->in_disconnect = GNUNET_YES;
469 while (NULL != (mq = n->messages_head))
471 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
472 mq->cont (mq->cont_cls, GNUNET_SYSERR);
475 if (NULL != n->is_active)
477 n->is_active->n = NULL;
480 if (GNUNET_YES == n->is_connected)
482 n->is_connected = GNUNET_NO;
483 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != n->keepalive_task);
484 GNUNET_SCHEDULER_cancel (n->keepalive_task);
485 n->keepalive_task = GNUNET_SCHEDULER_NO_TASK;
486 GNUNET_assert (neighbours_connected > 0);
487 neighbours_connected--;
488 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# peers connected"), -1,
490 disconnect_notify_cb (callback_cls, &n->id);
492 GNUNET_assert (GNUNET_YES ==
493 GNUNET_CONTAINER_multihashmap_remove (neighbours,
494 &n->id.hashPubKey, n));
495 if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
497 GNUNET_SCHEDULER_cancel (n->timeout_task);
498 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
500 if (GNUNET_SCHEDULER_NO_TASK != n->transmission_task)
502 GNUNET_SCHEDULER_cancel (n->transmission_task);
503 n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
507 GNUNET_ATS_suggest_address_cancel (n->asc);
510 GNUNET_array_grow (n->ats, n->ats_count, 0);
511 if (NULL != n->plugin_name)
513 GNUNET_free (n->plugin_name);
514 n->plugin_name = NULL;
518 GNUNET_free (n->addr);
528 * Peer has been idle for too long. Disconnect.
530 * @param cls the 'struct NeighbourMapEntry' of the neighbour that went idle
531 * @param tc scheduler context
534 neighbour_timeout_task (void *cls,
535 const struct GNUNET_SCHEDULER_TaskContext *tc)
537 struct NeighbourMapEntry *n = cls;
539 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
540 if (GNUNET_YES == n->is_connected)
541 GNUNET_STATISTICS_update (GST_stats,
542 gettext_noop ("# peers disconnected due to timeout"), 1,
544 disconnect_neighbour (n);
549 * Send another keepalive message.
551 * @param cls the 'struct NeighbourMapEntry' of the neighbour that went idle
552 * @param tc scheduler context
555 neighbour_keepalive_task (void *cls,
556 const struct GNUNET_SCHEDULER_TaskContext *tc)
558 struct NeighbourMapEntry *n = cls;
559 struct GNUNET_MessageHeader m;
560 struct GNUNET_TRANSPORT_PluginFunctions *papi;
562 n->keepalive_task = GNUNET_SCHEDULER_NO_TASK;
563 GNUNET_assert (GNUNET_YES == n->is_connected);
564 GNUNET_STATISTICS_update (GST_stats,
565 gettext_noop ("# keepalives sent"), 1,
567 m.size = htons (sizeof (struct GNUNET_MessageHeader));
568 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
569 papi = GST_plugins_find (n->plugin_name);
571 papi->send (papi->cls,
572 &n->id, (const void *) &m,
574 UINT32_MAX /* priority */ ,
575 GNUNET_TIME_UNIT_FOREVER_REL, n->session, n->addr, n->addrlen,
576 GNUNET_YES, NULL, NULL);
577 n->keepalive_task = GNUNET_SCHEDULER_add_delayed (KEEPALIVE_FREQUENCY,
578 &neighbour_keepalive_task,
584 * Disconnect from the given neighbour.
587 * @param key hash of neighbour's public key (not used)
588 * @param value the 'struct NeighbourMapEntry' of the neighbour
591 disconnect_all_neighbours (void *cls, const GNUNET_HashCode * key, void *value)
593 struct NeighbourMapEntry *n = value;
596 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s', %s\n",
597 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
599 if (GNUNET_YES == n->is_connected)
600 GNUNET_STATISTICS_update (GST_stats,
601 gettext_noop ("# peers disconnected due to global disconnect"), 1,
603 disconnect_neighbour (n);
609 * Cleanup the neighbours subsystem.
612 GST_neighbours_stop ()
614 GNUNET_assert (neighbours != NULL);
616 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &disconnect_all_neighbours,
618 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
619 GNUNET_assert (neighbours_connected == 0);
622 connect_notify_cb = NULL;
623 disconnect_notify_cb = NULL;
628 * For an existing neighbour record, set the active connection to
631 * @param peer identity of the peer to switch the address for
632 * @param plugin_name name of transport that delivered the PONG
633 * @param address address of the other peer, NULL if other peer
635 * @param address_len number of bytes in address
636 * @param session session to use (or NULL)
637 * @param ats performance data
638 * @param ats_count number of entries in ats (excluding 0-termination)
641 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
642 const char *plugin_name, const void *address,
643 size_t address_len, struct Session *session,
644 const struct GNUNET_TRANSPORT_ATS_Information
645 *ats, uint32_t ats_count)
647 struct NeighbourMapEntry *n;
648 struct SessionConnectMessage connect_msg;
650 GNUNET_assert (neighbours != NULL);
652 n = lookup_neighbour (peer);
660 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
661 "SWITCH! Peer `%4s' switches to plugin `%s' address '%s' session %X\n",
662 GNUNET_i2s (peer), plugin_name,
663 (address_len == 0) ? "<inbound>" : GST_plugins_a2s (plugin_name,
669 GNUNET_free_non_null (n->addr);
670 n->addr = GNUNET_malloc (address_len);
671 memcpy (n->addr, address, address_len);
672 n->addrlen = address_len;
673 n->session = session;
674 GNUNET_array_grow (n->ats, n->ats_count, ats_count);
676 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
677 GNUNET_free_non_null (n->plugin_name);
678 n->plugin_name = GNUNET_strdup (plugin_name);
679 GNUNET_SCHEDULER_cancel (n->timeout_task);
681 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
682 &neighbour_timeout_task, n);
683 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
684 connect_msg.header.type =
685 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
686 connect_msg.reserved = htonl (0);
687 connect_msg.timestamp =
688 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
689 GST_neighbours_send (peer, &connect_msg, sizeof (connect_msg),
690 GNUNET_TIME_UNIT_FOREVER_REL, NULL, NULL);
695 * Try to connect to the target peer using the given address
697 * @param cls the 'struct NeighbourMapEntry' of the target
698 * @param target identity of the target peer
699 * @param plugin_name name of the plugin
700 * @param plugin_address binary address
701 * @param plugin_address_len length of address
702 * @param session session to use
703 * @param bandwidth available bandwidth
704 * @param ats performance data for the address (as far as known)
705 * @param ats_count number of performance records in 'ats'
708 try_connect_using_address (void *cls, const struct GNUNET_PeerIdentity *target,
709 const char *plugin_name, const void *plugin_address,
710 size_t plugin_address_len, struct Session *session,
711 struct GNUNET_BANDWIDTH_Value32NBO bandwidth,
712 const struct GNUNET_TRANSPORT_ATS_Information *ats,
715 struct NeighbourMapEntry *n = cls;
719 was_connected = n->is_connected;
720 n->is_connected = GNUNET_YES;
721 GST_neighbours_switch_to_address (target, plugin_name, plugin_address,
722 plugin_address_len, session, ats,
724 if (GNUNET_YES == was_connected)
726 n->keepalive_task = GNUNET_SCHEDULER_add_now (&neighbour_keepalive_task,
728 neighbours_connected++;
729 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# peers connected"), 1,
731 connect_notify_cb (callback_cls, target, n->ats, n->ats_count);
736 * Try to create a connection to the given target (eventually).
738 * @param target peer to try to connect to
741 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
743 struct NeighbourMapEntry *n;
745 GNUNET_assert (neighbours != NULL);
748 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Trying to connect to peer `%s'\n",
749 GNUNET_i2s (target));
753 memcmp (target, &GST_my_identity,
754 sizeof (struct GNUNET_PeerIdentity)));
755 n = lookup_neighbour (target);
756 if ((NULL != n) && (GNUNET_YES == n->is_connected))
757 return; /* already connected */
761 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
762 "Unknown peer `%s', creating new neighbour\n",
763 GNUNET_i2s (target));
765 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
767 GNUNET_array_grow (n->ats, n->ats_count, 1);
768 n->ats[0].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);;
769 n->ats[0].value = htonl (0);
770 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
771 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
772 MAX_BANDWIDTH_CARRY_S);
774 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
775 &neighbour_timeout_task, n);
776 GNUNET_assert (GNUNET_OK ==
777 GNUNET_CONTAINER_multihashmap_put (neighbours,
778 &n->id.hashPubKey, n,
779 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
782 return; /* already trying */
784 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
785 "Asking ATS for suggested address to connect to peer `%s'\n",
786 GNUNET_i2s (target));
789 GNUNET_ATS_suggest_address (GST_ats, target, &try_connect_using_address,
795 * Test if we're connected to the given peer.
797 * @param target peer to test
798 * @return GNUNET_YES if we are connected, GNUNET_NO if not
801 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
803 struct NeighbourMapEntry *n;
805 GNUNET_assert (neighbours != NULL);
807 n = lookup_neighbour (target);
808 if ((NULL == n) || (n->is_connected != GNUNET_YES))
809 return GNUNET_NO; /* not connected */
815 * A session was terminated. Take note.
817 * @param peer identity of the peer where the session died
818 * @param session session that is gone
821 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
822 struct Session *session)
824 struct NeighbourMapEntry *n;
826 GNUNET_assert (neighbours != NULL);
829 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
830 "Session %X to peer `%s' ended \n",
831 session, GNUNET_i2s (peer));
834 n = lookup_neighbour (peer);
837 if (session != n->session)
838 return; /* doesn't affect us */
841 GNUNET_free (n->addr);
846 if (GNUNET_YES != n->is_connected)
847 return; /* not connected anymore anyway, shouldn't matter */
849 //n->is_connected = GNUNET_NO;
851 /* fast disconnect unless ATS suggests a new address */
852 GNUNET_SCHEDULER_cancel (n->timeout_task);
854 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
855 &neighbour_timeout_task, n);
856 /* try QUICKLY to re-establish a connection, reduce timeout! */
859 /* how can this be!? */
864 GNUNET_ATS_suggest_address (GST_ats, peer, &try_connect_using_address, n);
869 * Transmit a message to the given target using the active connection.
871 * @param target destination
872 * @param msg message to send
873 * @param msg_size number of bytes in msg
874 * @param timeout when to fail with timeout
875 * @param cont function to call when done
876 * @param cont_cls closure for 'cont'
879 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
880 size_t msg_size, struct GNUNET_TIME_Relative timeout,
881 GST_NeighbourSendContinuation cont, void *cont_cls)
883 struct NeighbourMapEntry *n;
884 struct MessageQueue *mq;
886 GNUNET_assert (neighbours != NULL);
888 n = lookup_neighbour (target);
889 if ((n == NULL) || (GNUNET_YES != n->is_connected))
891 GNUNET_STATISTICS_update (GST_stats,
893 ("# messages not sent (no such peer or not connected)"),
897 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
898 "Could not send message to peer `%s': unknown neighbor",
899 GNUNET_i2s (target));
900 else if (GNUNET_YES != n->is_connected)
901 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
902 "Could not send message to peer `%s': not connected\n",
903 GNUNET_i2s (target));
906 cont (cont_cls, GNUNET_SYSERR);
910 if ((n->session == NULL) && (n->addr == NULL) && (n->addrlen ==0))
912 GNUNET_STATISTICS_update (GST_stats,
914 ("# messages not sent (no such peer or not connected)"),
917 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
918 "Could not send message to peer `%s': no address available\n",
919 GNUNET_i2s (target));
923 cont (cont_cls, GNUNET_SYSERR);
928 GNUNET_assert (msg_size >= sizeof (struct GNUNET_MessageHeader));
929 GNUNET_STATISTICS_update (GST_stats,
931 ("# bytes in message queue for other peers"),
932 msg_size, GNUNET_NO);
933 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
935 mq->cont_cls = cont_cls;
936 /* FIXME: this memcpy can be up to 7% of our total runtime! */
937 memcpy (&mq[1], msg, msg_size);
938 mq->message_buf = (const char *) &mq[1];
939 mq->message_buf_size = msg_size;
940 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
941 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
942 if ((GNUNET_SCHEDULER_NO_TASK == n->transmission_task) &&
943 (NULL == n->is_active))
944 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
949 * We have received a message from the given sender. How long should
950 * we delay before receiving more? (Also used to keep the peer marked
953 * @param sender sender of the message
954 * @param size size of the message
955 * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
956 * GNUNET_NO if the neighbour is not connected or violates the quota
957 * @return how long to wait before reading more from this sender
959 struct GNUNET_TIME_Relative
960 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
961 *sender, ssize_t size, int *do_forward)
963 struct NeighbourMapEntry *n;
964 struct GNUNET_TIME_Relative ret;
966 GNUNET_assert (neighbours != NULL);
968 n = lookup_neighbour (sender);
971 *do_forward = GNUNET_NO;
972 return GNUNET_TIME_UNIT_ZERO;
974 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
976 n->quota_violation_count++;
978 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
979 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
980 n->in_tracker.available_bytes_per_s__,
981 n->quota_violation_count);
983 /* Discount 32k per violation */
984 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
988 if (n->quota_violation_count > 0)
990 /* try to add 32k back */
991 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
992 n->quota_violation_count--;
995 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
997 GNUNET_STATISTICS_update (GST_stats,
999 ("# bandwidth quota violations by other peers"),
1001 *do_forward = GNUNET_NO;
1002 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
1004 *do_forward = GNUNET_YES;
1005 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
1006 if (ret.rel_value > 0)
1009 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1010 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
1011 (unsigned long long) n->in_tracker.
1012 consumption_since_last_update__,
1013 (unsigned int) n->in_tracker.available_bytes_per_s__,
1014 (unsigned long long) ret.rel_value);
1016 GNUNET_STATISTICS_update (GST_stats,
1017 gettext_noop ("# ms throttling suggested"),
1018 (int64_t) ret.rel_value, GNUNET_NO);
1025 * Keep the connection to the given neighbour alive longer,
1026 * we received a KEEPALIVE (or equivalent).
1028 * @param neighbour neighbour to keep alive
1031 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
1033 struct NeighbourMapEntry *n;
1035 GNUNET_assert (neighbours != NULL);
1037 n = lookup_neighbour (neighbour);
1040 GNUNET_STATISTICS_update (GST_stats,
1042 ("# KEEPALIVE messages discarded (not connected)"),
1046 GNUNET_SCHEDULER_cancel (n->timeout_task);
1048 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1049 &neighbour_timeout_task, n);
1054 * Change the incoming quota for the given peer.
1056 * @param neighbour identity of peer to change qutoa for
1057 * @param quota new quota
1060 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
1061 struct GNUNET_BANDWIDTH_Value32NBO quota)
1063 struct NeighbourMapEntry *n;
1065 GNUNET_assert (neighbours != NULL);
1067 n = lookup_neighbour (neighbour);
1070 GNUNET_STATISTICS_update (GST_stats,
1072 ("# SET QUOTA messages ignored (no such peer)"),
1076 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
1077 if (0 != ntohl (quota.value__))
1080 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
1081 GNUNET_i2s (&n->id), "SET_QUOTA");
1083 if (GNUNET_YES == n->is_connected)
1084 GNUNET_STATISTICS_update (GST_stats,
1085 gettext_noop ("# disconnects due to quota of 0"), 1,
1087 disconnect_neighbour (n);
1092 * Closure for the neighbours_iterate function.
1094 struct IteratorContext
1097 * Function to call on each connected neighbour.
1099 GST_NeighbourIterator cb;
1109 * Call the callback from the closure for each connected neighbour.
1111 * @param cls the 'struct IteratorContext'
1112 * @param key the hash of the public key of the neighbour
1113 * @param value the 'struct NeighbourMapEntry'
1114 * @return GNUNET_OK (continue to iterate)
1117 neighbours_iterate (void *cls, const GNUNET_HashCode * key, void *value)
1119 struct IteratorContext *ic = cls;
1120 struct NeighbourMapEntry *n = value;
1122 if (GNUNET_YES != n->is_connected)
1125 GNUNET_assert (n->ats_count > 0);
1126 ic->cb (ic->cb_cls, &n->id, n->ats, n->ats_count, n->plugin_name, n->addr, n->addrlen);
1132 * Iterate over all connected neighbours.
1134 * @param cb function to call
1135 * @param cb_cls closure for cb
1138 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
1140 struct IteratorContext ic;
1142 GNUNET_assert (neighbours != NULL);
1146 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
1151 * If we have an active connection to the given target, it must be shutdown.
1153 * @param target peer to disconnect from
1156 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
1158 struct NeighbourMapEntry *n;
1159 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1160 struct SessionDisconnectMessage disconnect_msg;
1162 GNUNET_assert (neighbours != NULL);
1164 n = lookup_neighbour (target);
1166 return; /* not active */
1167 if (GNUNET_YES == n->is_connected)
1169 /* we're actually connected, send DISCONNECT message */
1170 disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
1171 disconnect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
1172 disconnect_msg.reserved = htonl (0);
1173 disconnect_msg.purpose.size = htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1174 sizeof (struct GNUNET_TIME_AbsoluteNBO));
1175 disconnect_msg.purpose.purpose = htonl (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1176 disconnect_msg.timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1177 GNUNET_assert (GNUNET_OK ==
1178 GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
1179 &disconnect_msg.purpose,
1180 &disconnect_msg.signature));
1181 papi = GST_plugins_find (n->plugin_name);
1183 papi->send (papi->cls, target, (const void *) &disconnect_msg,
1184 sizeof (disconnect_msg),
1185 UINT32_MAX /* priority */ ,
1186 GNUNET_TIME_UNIT_FOREVER_REL, n->session, n->addr, n->addrlen,
1187 GNUNET_YES, NULL, NULL);
1188 GNUNET_STATISTICS_update (GST_stats,
1189 gettext_noop ("# peers disconnected due to external request"), 1,
1192 disconnect_neighbour (n);
1196 /* end of file gnunet-service-transport_neighbours.c */