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_clients.h"
32 #include "gnunet-service-transport.h"
33 #include "gnunet_peerinfo_service.h"
34 #include "gnunet_constants.h"
35 #include "transport.h"
39 * Size of the neighbour hash map.
41 #define NEIGHBOUR_TABLE_SIZE 256
44 * How often must a peer violate bandwidth quotas before we start
45 * to simply drop its messages?
47 #define QUOTA_VIOLATION_DROP_THRESHOLD 10
50 * How often do we send KEEPALIVE messages to each of our neighbours?
51 * (idle timeout is 5 minutes or 300 seconds, so with 90s interval we
52 * send 3 keepalives in each interval, so 3 messages would need to be
53 * lost in a row for a disconnect).
55 #define KEEPALIVE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 90)
59 * Entry in neighbours.
61 struct NeighbourMapEntry;
64 * Message a peer sends to another to indicate its
65 * preference for communicating via a particular
66 * session (and the desire to establish a real
69 struct SessionConnectMessage
72 * Header of type 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT'
74 struct GNUNET_MessageHeader header;
79 uint32_t reserved GNUNET_PACKED;
82 * Absolute time at the sender. Only the most recent connect
83 * message implies which session is preferred by the sender.
85 struct GNUNET_TIME_AbsoluteNBO timestamp;
90 struct SessionDisconnectMessage
93 * Header of type 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT'
95 struct GNUNET_MessageHeader header;
100 uint32_t reserved GNUNET_PACKED;
103 * Purpose of the signature. Extends over the timestamp.
104 * Purpose should be GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DISCONNECT.
106 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
109 * Absolute time at the sender. Only the most recent connect
110 * message implies which session is preferred by the sender.
112 struct GNUNET_TIME_AbsoluteNBO timestamp;
115 * Public key of the sender.
117 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
120 * Signature of the peer that sends us the disconnect. Only
121 * valid if the timestamp is AFTER the timestamp from the
122 * corresponding 'CONNECT' message.
124 struct GNUNET_CRYPTO_RsaSignature signature;
130 * For each neighbour we keep a list of messages
131 * that we still want to transmit to the neighbour.
137 * This is a doubly linked list.
139 struct MessageQueue *next;
142 * This is a doubly linked list.
144 struct MessageQueue *prev;
147 * Once this message is actively being transmitted, which
148 * neighbour is it associated with?
150 struct NeighbourMapEntry *n;
153 * Function to call once we're done.
155 GST_NeighbourSendContinuation cont;
163 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
164 * stuck together in memory. Allocated at the end of this struct.
166 const char *message_buf;
169 * Size of the message buf
171 size_t message_buf_size;
174 * At what time should we fail?
176 struct GNUNET_TIME_Absolute timeout;
182 * Entry in neighbours.
184 struct NeighbourMapEntry
188 * Head of list of messages we would like to send to this peer;
189 * must contain at most one message per client.
191 struct MessageQueue *messages_head;
194 * Tail of list of messages we would like to send to this peer; must
195 * contain at most one message per client.
197 struct MessageQueue *messages_tail;
200 * Performance data for the peer.
202 //struct GNUNET_ATS_Information *ats;
205 * Are we currently trying to send a message? If so, which one?
207 struct MessageQueue *is_active;
210 * Active session for communicating with the peer.
212 struct Session *session;
215 * Name of the plugin we currently use.
220 * Address used for communicating with the peer, NULL for inbound connections.
225 * Number of bytes in 'addr'.
230 * Identity of this neighbour.
232 struct GNUNET_PeerIdentity id;
235 * ID of task scheduled to run when this peer is about to
236 * time out (will free resources associated with the peer).
238 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
241 * ID of task scheduled to send keepalives.
243 GNUNET_SCHEDULER_TaskIdentifier keepalive_task;
246 * ID of task scheduled to run when we should try transmitting
247 * the head of the message queue.
249 GNUNET_SCHEDULER_TaskIdentifier transmission_task;
252 * Tracker for inbound bandwidth.
254 struct GNUNET_BANDWIDTH_Tracker in_tracker;
257 * Timestamp of the 'SESSION_CONNECT' message we got from the other peer
259 struct GNUNET_TIME_Absolute connect_ts;
262 * How often has the other peer (recently) violated the inbound
263 * traffic limit? Incremented by 10 per violation, decremented by 1
264 * per non-violation (for each time interval).
266 unsigned int quota_violation_count;
269 * Number of values in 'ats' array.
271 //unsigned int ats_count;
274 * Are we already in the process of disconnecting this neighbour?
279 * Do we currently consider this neighbour connected? (as far as
280 * the connect/disconnect callbacks are concerned)?
288 * All known neighbours and their HELLOs.
290 static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
293 * Closure for connect_notify_cb and disconnect_notify_cb
295 static void *callback_cls;
298 * Function to call when we connected to a neighbour.
300 static GNUNET_TRANSPORT_NotifyConnect connect_notify_cb;
303 * Function to call when we disconnected from a neighbour.
305 static GNUNET_TRANSPORT_NotifyDisconnect disconnect_notify_cb;
308 * counter for connected neighbours
310 static int neighbours_connected;
313 * Lookup a neighbour entry in the neighbours hash map.
315 * @param pid identity of the peer to look up
316 * @return the entry, NULL if there is no existing record
318 static struct NeighbourMapEntry *
319 lookup_neighbour (const struct GNUNET_PeerIdentity *pid)
321 return GNUNET_CONTAINER_multihashmap_get (neighbours, &pid->hashPubKey);
326 * Task invoked to start a transmission to another peer.
328 * @param cls the 'struct NeighbourMapEntry'
329 * @param tc scheduler context
332 transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
336 * We're done with our transmission attempt, continue processing.
338 * @param cls the 'struct MessageQueue' of the message
339 * @param receiver intended receiver
340 * @param success whether it worked or not
343 transmit_send_continuation (void *cls,
344 const struct GNUNET_PeerIdentity *receiver,
347 struct MessageQueue *mq;
348 struct NeighbourMapEntry *n;
354 GNUNET_assert (n->is_active == mq);
356 if (success == GNUNET_YES)
358 GNUNET_assert (n->transmission_task == GNUNET_SCHEDULER_NO_TASK);
359 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
362 if (NULL != mq->cont)
363 mq->cont (mq->cont_cls, success);
369 * Check the ready list for the given neighbour and if a plugin is
370 * ready for transmission (and if we have a message), do so!
372 * @param n target peer for which to transmit
375 try_transmission_to_peer (struct NeighbourMapEntry *n)
377 struct MessageQueue *mq;
378 struct GNUNET_TIME_Relative timeout;
380 struct GNUNET_TRANSPORT_PluginFunctions *papi;
382 if (n->is_active != NULL)
383 return; /* transmission already pending */
384 if (n->transmission_task != GNUNET_SCHEDULER_NO_TASK)
385 return; /* currently waiting for bandwidth */
386 while (NULL != (mq = n->messages_head))
388 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
389 if (timeout.rel_value > 0)
391 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
394 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR); /* timeout */
397 return; /* no more messages */
399 papi = GST_plugins_find (n->plugin_name);
405 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
409 if (((n->session == NULL) && (n->addr == NULL) && (n->addrlen == 0)))
411 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "No address for peer `%s'\n",
412 GNUNET_i2s (&n->id));
413 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);
414 GNUNET_assert (n->transmission_task == GNUNET_SCHEDULER_NO_TASK);
415 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
420 papi->send (papi->cls, &n->id, mq->message_buf, mq->message_buf_size,
421 0 /* priority -- remove from plugin API? */ ,
422 timeout, n->session, n->addr, n->addrlen, GNUNET_YES,
423 &transmit_send_continuation, mq);
426 /* failure, but 'send' would not call continuation in this case,
427 * so we need to do it here! */
428 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);
434 * Task invoked to start a transmission to another peer.
436 * @param cls the 'struct NeighbourMapEntry'
437 * @param tc scheduler context
440 transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
442 struct NeighbourMapEntry *n = cls;
443 GNUNET_assert (NULL != lookup_neighbour(&n->id));
444 n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
445 try_transmission_to_peer (n);
450 * Initialize the neighbours subsystem.
452 * @param cls closure for callbacks
453 * @param connect_cb function to call if we connect to a peer
454 * @param disconnect_cb function to call if we disconnect from a peer
457 GST_neighbours_start (void *cls, GNUNET_TRANSPORT_NotifyConnect connect_cb,
458 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb)
461 connect_notify_cb = connect_cb;
462 disconnect_notify_cb = disconnect_cb;
463 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
468 * Disconnect from the given neighbour, clean up the record.
470 * @param n neighbour to disconnect from
473 disconnect_neighbour (struct NeighbourMapEntry *n)
475 struct MessageQueue *mq;
477 if (GNUNET_YES == n->in_disconnect)
479 n->in_disconnect = GNUNET_YES;
480 while (NULL != (mq = n->messages_head))
482 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
483 if (NULL != mq->cont)
484 mq->cont (mq->cont_cls, GNUNET_SYSERR);
487 if (NULL != n->is_active)
489 n->is_active->n = NULL;
492 if (GNUNET_YES == n->is_connected)
494 n->is_connected = GNUNET_NO;
495 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != n->keepalive_task);
496 GNUNET_SCHEDULER_cancel (n->keepalive_task);
497 n->keepalive_task = GNUNET_SCHEDULER_NO_TASK;
498 GNUNET_assert (neighbours_connected > 0);
499 neighbours_connected--;
500 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# peers connected"), -1,
502 disconnect_notify_cb (callback_cls, &n->id);
504 GNUNET_assert (GNUNET_YES ==
505 GNUNET_CONTAINER_multihashmap_remove (neighbours,
506 &n->id.hashPubKey, n));
507 if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
509 GNUNET_SCHEDULER_cancel (n->timeout_task);
510 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
512 if (GNUNET_SCHEDULER_NO_TASK != n->transmission_task)
514 GNUNET_SCHEDULER_cancel (n->transmission_task);
515 n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
517 if (NULL != n->plugin_name)
519 GNUNET_free (n->plugin_name);
520 n->plugin_name = NULL;
524 GNUNET_free (n->addr);
534 * Peer has been idle for too long. Disconnect.
536 * @param cls the 'struct NeighbourMapEntry' of the neighbour that went idle
537 * @param tc scheduler context
540 neighbour_timeout_task (void *cls,
541 const struct GNUNET_SCHEDULER_TaskContext *tc)
543 struct NeighbourMapEntry *n = cls;
545 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
546 if (GNUNET_YES == n->is_connected)
547 GNUNET_STATISTICS_update (GST_stats,
548 gettext_noop ("# peers disconnected due to timeout"), 1,
550 disconnect_neighbour (n);
555 * Send another keepalive message.
557 * @param cls the 'struct NeighbourMapEntry' of the neighbour that went idle
558 * @param tc scheduler context
561 neighbour_keepalive_task (void *cls,
562 const struct GNUNET_SCHEDULER_TaskContext *tc)
564 struct NeighbourMapEntry *n = cls;
565 struct GNUNET_MessageHeader m;
566 struct GNUNET_TRANSPORT_PluginFunctions *papi;
568 n->keepalive_task = GNUNET_SCHEDULER_add_delayed (KEEPALIVE_FREQUENCY,
569 &neighbour_keepalive_task,
571 GNUNET_assert (GNUNET_YES == n->is_connected);
572 GNUNET_STATISTICS_update (GST_stats,
573 gettext_noop ("# keepalives sent"), 1,
575 m.size = htons (sizeof (struct GNUNET_MessageHeader));
576 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
577 papi = GST_plugins_find (n->plugin_name);
579 papi->send (papi->cls,
580 &n->id, (const void *) &m,
582 UINT32_MAX /* priority */ ,
583 GNUNET_TIME_UNIT_FOREVER_REL, n->session, n->addr, n->addrlen,
584 GNUNET_YES, NULL, NULL);
589 * Disconnect from the given neighbour.
592 * @param key hash of neighbour's public key (not used)
593 * @param value the 'struct NeighbourMapEntry' of the neighbour
596 disconnect_all_neighbours (void *cls, const GNUNET_HashCode * key, void *value)
598 struct NeighbourMapEntry *n = value;
601 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s', %s\n",
602 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
604 if (GNUNET_YES == n->is_connected)
605 GNUNET_STATISTICS_update (GST_stats,
606 gettext_noop ("# peers disconnected due to global disconnect"), 1,
608 disconnect_neighbour (n);
614 * Cleanup the neighbours subsystem.
617 GST_neighbours_stop ()
619 GNUNET_assert (neighbours != NULL);
621 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &disconnect_all_neighbours,
623 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
624 GNUNET_assert (neighbours_connected == 0);
627 connect_notify_cb = NULL;
628 disconnect_notify_cb = NULL;
633 * We tried to send a SESSION_CONNECT message to another peer. If this
634 * succeeded, we should mark the peer up. If it failed, we should tell
635 * ATS to not use this address anymore (until it is re-validated).
637 * @param cls the 'struct NeighbourMapEntry'
638 * @param success GNUNET_OK on success
641 send_connect_continuation (void *cls,
644 struct NeighbourMapEntry *n = cls;
646 GNUNET_assert (n != NULL);
647 if (GNUNET_YES == n->in_disconnect)
648 return; /* neighbour is going away */
649 if (GNUNET_YES != success)
651 GNUNET_ATS_address_destroyed (GST_ats,
657 disconnect_neighbour (n);
664 * For an existing neighbour record, set the active connection to
667 * @param peer identity of the peer to switch the address for
668 * @param plugin_name name of transport that delivered the PONG
669 * @param address address of the other peer, NULL if other peer
671 * @param address_len number of bytes in address
672 * @param session session to use (or NULL)
673 * @param ats performance data
674 * @param ats_count number of entries in ats (excluding 0-termination)
675 * @return GNUNET_YES if we are currently connected, GNUNET_NO if the
676 * connection is not up (yet)
679 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
680 const char *plugin_name, const void *address,
681 size_t address_len, struct Session *session,
682 const struct GNUNET_ATS_Information
683 *ats, uint32_t ats_count)
685 struct NeighbourMapEntry *n;
686 struct SessionConnectMessage connect_msg;
689 GNUNET_assert (neighbours != NULL);
690 n = lookup_neighbour (peer);
694 GNUNET_ATS_address_destroyed (GST_ats,
696 plugin_name, address,
700 was_connected = n->is_connected;
701 n->is_connected = GNUNET_YES;
702 if (GNUNET_YES != was_connected)
703 n->keepalive_task = GNUNET_SCHEDULER_add_delayed (KEEPALIVE_FREQUENCY,
704 &neighbour_keepalive_task,
708 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
709 "SWITCH! Peer `%4s' switches to plugin `%s' address '%s' session %X\n",
710 GNUNET_i2s (peer), plugin_name,
711 (address_len == 0) ? "<inbound>" : GST_plugins_a2s (plugin_name,
716 GNUNET_free_non_null (n->addr);
717 n->addr = GNUNET_malloc (address_len);
718 memcpy (n->addr, address, address_len);
719 n->addrlen = address_len;
720 n->session = session;
721 GNUNET_free_non_null (n->plugin_name);
722 n->plugin_name = GNUNET_strdup (plugin_name);
723 GNUNET_SCHEDULER_cancel (n->timeout_task);
725 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
726 &neighbour_timeout_task, n);
727 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
728 connect_msg.header.type =
729 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
730 connect_msg.reserved = htonl (0);
731 connect_msg.timestamp =
732 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
733 GST_neighbours_send (peer, &connect_msg, sizeof (connect_msg),
734 GNUNET_TIME_UNIT_FOREVER_REL,
735 &send_connect_continuation,
737 if (GNUNET_YES == was_connected)
739 /* First tell clients about connected neighbours...*/
740 neighbours_connected++;
741 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# peers connected"), 1,
743 connect_notify_cb (callback_cls, peer, ats, ats_count);
749 * Create an entry in the neighbour map for the given peer
751 * @param peer peer to create an entry for
752 * @return new neighbour map entry
754 static struct NeighbourMapEntry *
755 setup_neighbour (const struct GNUNET_PeerIdentity *peer)
757 struct NeighbourMapEntry *n;
760 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
761 "Unknown peer `%s', creating new neighbour\n",
764 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
766 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
767 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
768 MAX_BANDWIDTH_CARRY_S);
770 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
771 &neighbour_timeout_task, n);
772 GNUNET_assert (GNUNET_OK ==
773 GNUNET_CONTAINER_multihashmap_put (neighbours,
774 &n->id.hashPubKey, n,
775 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
781 * Try to create a connection to the given target (eventually).
783 * @param target peer to try to connect to
786 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
788 struct NeighbourMapEntry *n;
790 GNUNET_assert (neighbours != NULL);
792 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Trying to connect to peer `%s'\n",
793 GNUNET_i2s (target));
796 memcmp (target, &GST_my_identity,
797 sizeof (struct GNUNET_PeerIdentity)));
798 n = lookup_neighbour (target);
799 if ((NULL != n) && (GNUNET_YES == n->is_connected))
800 return; /* already connected */
802 n = setup_neighbour (target);
804 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
805 "Asking ATS for suggested address to connect to peer `%s'\n",
806 GNUNET_i2s (&n->id));
808 GNUNET_ATS_suggest_address (GST_ats, &n->id);
813 * Test if we're connected to the given peer.
815 * @param target peer to test
816 * @return GNUNET_YES if we are connected, GNUNET_NO if not
819 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
821 struct NeighbourMapEntry *n;
823 GNUNET_assert (neighbours != NULL);
825 n = lookup_neighbour (target);
826 if ((NULL == n) || (n->is_connected != GNUNET_YES))
827 return GNUNET_NO; /* not connected */
833 * A session was terminated. Take note.
835 * @param peer identity of the peer where the session died
836 * @param session session that is gone
839 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
840 struct Session *session)
842 struct NeighbourMapEntry *n;
844 GNUNET_assert (neighbours != NULL);
847 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
848 "Session %X to peer `%s' ended \n",
849 session, GNUNET_i2s (peer));
851 n = lookup_neighbour (peer);
854 if (session != n->session)
855 return; /* doesn't affect us */
858 GNUNET_free (n->addr);
863 if (GNUNET_YES != n->is_connected)
864 return; /* not connected anymore anyway, shouldn't matter */
865 /* fast disconnect unless ATS suggests a new address */
866 GNUNET_SCHEDULER_cancel (n->timeout_task);
868 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
869 &neighbour_timeout_task, n);
870 /* try QUICKLY to re-establish a connection, reduce timeout! */
871 GNUNET_ATS_suggest_address (GST_ats, peer);
876 * Transmit a message to the given target using the active connection.
878 * @param target destination
879 * @param msg message to send
880 * @param msg_size number of bytes in msg
881 * @param timeout when to fail with timeout
882 * @param cont function to call when done
883 * @param cont_cls closure for 'cont'
886 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
887 size_t msg_size, struct GNUNET_TIME_Relative timeout,
888 GST_NeighbourSendContinuation cont, void *cont_cls)
890 struct NeighbourMapEntry *n;
891 struct MessageQueue *mq;
893 GNUNET_assert (neighbours != NULL);
895 n = lookup_neighbour (target);
896 if ((n == NULL) || (GNUNET_YES != n->is_connected))
898 GNUNET_STATISTICS_update (GST_stats,
900 ("# messages not sent (no such peer or not connected)"),
904 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
905 "Could not send message to peer `%s': unknown neighbor",
906 GNUNET_i2s (target));
907 else if (GNUNET_YES != n->is_connected)
908 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
909 "Could not send message to peer `%s': not connected\n",
910 GNUNET_i2s (target));
913 cont (cont_cls, GNUNET_SYSERR);
917 if ((n->session == NULL) && (n->addr == NULL) && (n->addrlen ==0))
919 GNUNET_STATISTICS_update (GST_stats,
921 ("# messages not sent (no such peer or not connected)"),
924 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
925 "Could not send message to peer `%s': no address available\n",
926 GNUNET_i2s (target));
930 cont (cont_cls, GNUNET_SYSERR);
933 GNUNET_assert (msg_size >= sizeof (struct GNUNET_MessageHeader));
934 GNUNET_STATISTICS_update (GST_stats,
936 ("# bytes in message queue for other peers"),
937 msg_size, GNUNET_NO);
938 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
940 mq->cont_cls = cont_cls;
941 /* FIXME: this memcpy can be up to 7% of our total runtime! */
942 memcpy (&mq[1], msg, msg_size);
943 mq->message_buf = (const char *) &mq[1];
944 mq->message_buf_size = msg_size;
945 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
946 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
947 if ((GNUNET_SCHEDULER_NO_TASK == n->transmission_task) &&
948 (NULL == n->is_active))
949 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
954 * We have received a message from the given sender. How long should
955 * we delay before receiving more? (Also used to keep the peer marked
958 * @param sender sender of the message
959 * @param size size of the message
960 * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
961 * GNUNET_NO if the neighbour is not connected or violates the quota,
962 * GNUNET_SYSERR if the connection is not fully up yet
963 * @return how long to wait before reading more from this sender
965 struct GNUNET_TIME_Relative
966 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
967 *sender, ssize_t size, int *do_forward)
969 struct NeighbourMapEntry *n;
970 struct GNUNET_TIME_Relative ret;
972 GNUNET_assert (neighbours != NULL);
974 n = lookup_neighbour (sender);
977 GST_neighbours_try_connect (sender);
978 n = lookup_neighbour (sender);
981 GNUNET_STATISTICS_update (GST_stats,
983 ("# messages discarded due to lack of neighbour record"),
985 *do_forward = GNUNET_NO;
986 return GNUNET_TIME_UNIT_ZERO;
989 if (GNUNET_YES != n->is_connected)
991 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
992 _("Plugin gave us %d bytes of data but somehow the session is not marked as UP yet!\n"),
994 *do_forward = GNUNET_SYSERR;
995 return GNUNET_TIME_UNIT_ZERO;
997 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
999 n->quota_violation_count++;
1001 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1002 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
1003 n->in_tracker.available_bytes_per_s__,
1004 n->quota_violation_count);
1006 /* Discount 32k per violation */
1007 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
1011 if (n->quota_violation_count > 0)
1013 /* try to add 32k back */
1014 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
1015 n->quota_violation_count--;
1018 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
1020 GNUNET_STATISTICS_update (GST_stats,
1022 ("# bandwidth quota violations by other peers"),
1024 *do_forward = GNUNET_NO;
1025 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
1027 *do_forward = GNUNET_YES;
1028 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 32 * 1024);
1029 if (ret.rel_value > 0)
1032 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1033 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
1034 (unsigned long long) n->in_tracker.
1035 consumption_since_last_update__,
1036 (unsigned int) n->in_tracker.available_bytes_per_s__,
1037 (unsigned long long) ret.rel_value);
1039 GNUNET_STATISTICS_update (GST_stats,
1040 gettext_noop ("# ms throttling suggested"),
1041 (int64_t) ret.rel_value, GNUNET_NO);
1048 * Keep the connection to the given neighbour alive longer,
1049 * we received a KEEPALIVE (or equivalent).
1051 * @param neighbour neighbour to keep alive
1054 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
1056 struct NeighbourMapEntry *n;
1058 GNUNET_assert (neighbours != NULL);
1060 n = lookup_neighbour (neighbour);
1063 GNUNET_STATISTICS_update (GST_stats,
1065 ("# KEEPALIVE messages discarded (not connected)"),
1069 GNUNET_SCHEDULER_cancel (n->timeout_task);
1071 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1072 &neighbour_timeout_task, n);
1077 * Change the incoming quota for the given peer.
1079 * @param neighbour identity of peer to change qutoa for
1080 * @param quota new quota
1083 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
1084 struct GNUNET_BANDWIDTH_Value32NBO quota)
1086 struct NeighbourMapEntry *n;
1088 GNUNET_assert (neighbours != NULL);
1090 n = lookup_neighbour (neighbour);
1093 GNUNET_STATISTICS_update (GST_stats,
1095 ("# SET QUOTA messages ignored (no such peer)"),
1099 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
1100 if (0 != ntohl (quota.value__))
1103 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
1104 GNUNET_i2s (&n->id), "SET_QUOTA");
1106 if (GNUNET_YES == n->is_connected)
1107 GNUNET_STATISTICS_update (GST_stats,
1108 gettext_noop ("# disconnects due to quota of 0"), 1,
1110 disconnect_neighbour (n);
1115 * Closure for the neighbours_iterate function.
1117 struct IteratorContext
1120 * Function to call on each connected neighbour.
1122 GST_NeighbourIterator cb;
1132 * Call the callback from the closure for each connected neighbour.
1134 * @param cls the 'struct IteratorContext'
1135 * @param key the hash of the public key of the neighbour
1136 * @param value the 'struct NeighbourMapEntry'
1137 * @return GNUNET_OK (continue to iterate)
1140 neighbours_iterate (void *cls, const GNUNET_HashCode * key, void *value)
1142 struct IteratorContext *ic = cls;
1143 struct NeighbourMapEntry *n = value;
1145 if (GNUNET_YES != n->is_connected)
1148 ic->cb (ic->cb_cls, &n->id, NULL, 0, n->plugin_name, n->addr, n->addrlen);
1154 * Iterate over all connected neighbours.
1156 * @param cb function to call
1157 * @param cb_cls closure for cb
1160 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
1162 struct IteratorContext ic;
1164 GNUNET_assert (neighbours != NULL);
1168 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
1173 * If we have an active connection to the given target, it must be shutdown.
1175 * @param target peer to disconnect from
1178 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
1180 struct NeighbourMapEntry *n;
1181 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1182 struct SessionDisconnectMessage disconnect_msg;
1184 GNUNET_assert (neighbours != NULL);
1186 n = lookup_neighbour (target);
1188 return; /* not active */
1189 if (GNUNET_YES == n->is_connected)
1191 /* we're actually connected, send DISCONNECT message */
1192 disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
1193 disconnect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
1194 disconnect_msg.reserved = htonl (0);
1195 disconnect_msg.purpose.size = htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1196 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
1197 sizeof (struct GNUNET_TIME_AbsoluteNBO) );
1198 disconnect_msg.purpose.purpose = htonl (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1199 disconnect_msg.timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1200 disconnect_msg.public_key = GST_my_public_key;
1201 GNUNET_assert (GNUNET_OK ==
1202 GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
1203 &disconnect_msg.purpose,
1204 &disconnect_msg.signature));
1205 papi = GST_plugins_find (n->plugin_name);
1207 papi->send (papi->cls, target, (const void *) &disconnect_msg,
1208 sizeof (disconnect_msg),
1209 UINT32_MAX /* priority */ ,
1210 GNUNET_TIME_UNIT_FOREVER_REL, n->session, n->addr, n->addrlen,
1211 GNUNET_YES, NULL, NULL);
1212 GNUNET_STATISTICS_update (GST_stats,
1213 gettext_noop ("# peers disconnected due to external request"), 1,
1215 n = lookup_neighbour (target);
1217 return; /* gone already */
1219 disconnect_neighbour (n);
1224 * We received a disconnect message from the given peer,
1225 * validate and process.
1227 * @param peer sender of the message
1228 * @param msg the disconnect message
1231 GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity *peer,
1232 const struct GNUNET_MessageHeader *msg)
1234 struct NeighbourMapEntry *n;
1235 const struct SessionDisconnectMessage *sdm;
1238 if (ntohs (msg->size) != sizeof (struct SessionDisconnectMessage))
1240 // GNUNET_break_op (0);
1241 GNUNET_STATISTICS_update (GST_stats,
1242 gettext_noop ("# disconnect messages ignored (old format)"), 1,
1246 sdm = (const struct SessionDisconnectMessage* ) msg;
1247 n = lookup_neighbour (peer);
1249 return; /* gone already */
1250 if (GNUNET_TIME_absolute_ntoh (sdm->timestamp).abs_value <=
1251 n->connect_ts.abs_value)
1253 GNUNET_STATISTICS_update (GST_stats,
1254 gettext_noop ("# disconnect messages ignored (timestamp)"), 1,
1258 GNUNET_CRYPTO_hash (&sdm->public_key,
1259 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1261 if (0 != memcmp (peer,
1263 sizeof (struct GNUNET_PeerIdentity)))
1265 GNUNET_break_op (0);
1268 if (ntohl (sdm->purpose.size) !=
1269 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1270 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
1271 sizeof (struct GNUNET_TIME_AbsoluteNBO))
1273 GNUNET_break_op (0);
1277 GNUNET_CRYPTO_rsa_verify (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT,
1282 GNUNET_break_op (0);
1285 GST_neighbours_force_disconnect (peer);
1290 * We received a 'SESSION_CONNECT' message from the other peer.
1291 * Consider switching to it.
1293 * @param message possibly a 'struct SessionConnectMessage' (check format)
1294 * @param peer identity of the peer to switch the address for
1295 * @param plugin_name name of transport that delivered the PONG
1296 * @param address address of the other peer, NULL if other peer
1298 * @param address_len number of bytes in address
1299 * @param session session to use (or NULL)
1300 * @param ats performance data
1301 * @param ats_count number of entries in ats (excluding 0-termination)
1304 GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
1305 const struct GNUNET_PeerIdentity *peer,
1306 const char *plugin_name,
1307 const char *sender_address, uint16_t sender_address_len,
1308 struct Session *session,
1309 const struct GNUNET_ATS_Information *ats,
1312 const struct SessionConnectMessage *scm;
1313 struct GNUNET_TIME_Absolute ts;
1314 struct NeighbourMapEntry *n;
1316 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
1318 GNUNET_break_op (0);
1321 scm = (const struct SessionConnectMessage *) message;
1322 GNUNET_break_op (ntohl (scm->reserved) == 0);
1323 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
1324 n = lookup_neighbour (peer);
1326 n = setup_neighbour (peer);
1327 if (ts.abs_value > n->connect_ts.abs_value)
1329 if (NULL != session)
1330 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO | GNUNET_ERROR_TYPE_BULK,
1332 "Giving ATS session %p of plugin %s for peer %s\n",
1336 GNUNET_ATS_address_update (GST_ats,
1338 plugin_name, sender_address, sender_address_len,
1339 session, ats, ats_count);
1345 /* end of file gnunet-service-transport_neighbours.c */