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 GNUNET_assert (n->transmission_task == GNUNET_SCHEDULER_NO_TASK);
357 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
359 if (NULL != mq->cont)
360 mq->cont (mq->cont_cls, success);
366 * Check the ready list for the given neighbour and if a plugin is
367 * ready for transmission (and if we have a message), do so!
369 * @param n target peer for which to transmit
372 try_transmission_to_peer (struct NeighbourMapEntry *n)
374 struct MessageQueue *mq;
375 struct GNUNET_TIME_Relative timeout;
377 struct GNUNET_TRANSPORT_PluginFunctions *papi;
379 if (n->is_active != NULL)
380 return; /* transmission already pending */
381 if (n->transmission_task != GNUNET_SCHEDULER_NO_TASK)
382 return; /* currently waiting for bandwidth */
383 while (NULL != (mq = n->messages_head))
385 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
386 if (timeout.rel_value > 0)
388 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
390 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR); /* timeout */
393 return; /* no more messages */
395 papi = GST_plugins_find (n->plugin_name);
401 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
405 if (((n->session == NULL) && (n->addr == NULL) && (n->addrlen == 0)))
407 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "No address for peer `%s'\n",
408 GNUNET_i2s (&n->id));
409 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);
410 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
415 papi->send (papi->cls, &n->id, mq->message_buf, mq->message_buf_size,
416 0 /* priority -- remove from plugin API? */ ,
417 timeout, n->session, n->addr, n->addrlen, GNUNET_YES,
418 &transmit_send_continuation, mq);
421 /* failure, but 'send' would not call continuation in this case,
422 * so we need to do it here! */
423 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);
424 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
430 * Task invoked to start a transmission to another peer.
432 * @param cls the 'struct NeighbourMapEntry'
433 * @param tc scheduler context
436 transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
438 struct NeighbourMapEntry *n = cls;
440 n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
441 try_transmission_to_peer (n);
446 * Initialize the neighbours subsystem.
448 * @param cls closure for callbacks
449 * @param connect_cb function to call if we connect to a peer
450 * @param disconnect_cb function to call if we disconnect from a peer
453 GST_neighbours_start (void *cls, GNUNET_TRANSPORT_NotifyConnect connect_cb,
454 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb)
457 connect_notify_cb = connect_cb;
458 disconnect_notify_cb = disconnect_cb;
459 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
464 * Disconnect from the given neighbour, clean up the record.
466 * @param n neighbour to disconnect from
469 disconnect_neighbour (struct NeighbourMapEntry *n)
471 struct MessageQueue *mq;
473 if (GNUNET_YES == n->in_disconnect)
475 n->in_disconnect = GNUNET_YES;
476 while (NULL != (mq = n->messages_head))
478 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
479 if (NULL != mq->cont)
480 mq->cont (mq->cont_cls, GNUNET_SYSERR);
483 if (NULL != n->is_active)
485 n->is_active->n = NULL;
488 if (GNUNET_YES == n->is_connected)
490 n->is_connected = GNUNET_NO;
491 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != n->keepalive_task);
492 GNUNET_SCHEDULER_cancel (n->keepalive_task);
493 n->keepalive_task = GNUNET_SCHEDULER_NO_TASK;
494 GNUNET_assert (neighbours_connected > 0);
495 neighbours_connected--;
496 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# peers connected"), -1,
498 disconnect_notify_cb (callback_cls, &n->id);
500 GNUNET_assert (GNUNET_YES ==
501 GNUNET_CONTAINER_multihashmap_remove (neighbours,
502 &n->id.hashPubKey, n));
503 if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
505 GNUNET_SCHEDULER_cancel (n->timeout_task);
506 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
508 if (GNUNET_SCHEDULER_NO_TASK != n->transmission_task)
510 GNUNET_SCHEDULER_cancel (n->transmission_task);
511 n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
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_add_delayed (KEEPALIVE_FREQUENCY,
565 &neighbour_keepalive_task,
567 GNUNET_assert (GNUNET_YES == n->is_connected);
568 GNUNET_STATISTICS_update (GST_stats,
569 gettext_noop ("# keepalives sent"), 1,
571 m.size = htons (sizeof (struct GNUNET_MessageHeader));
572 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
573 papi = GST_plugins_find (n->plugin_name);
575 papi->send (papi->cls,
576 &n->id, (const void *) &m,
578 UINT32_MAX /* priority */ ,
579 GNUNET_TIME_UNIT_FOREVER_REL, n->session, n->addr, n->addrlen,
580 GNUNET_YES, NULL, NULL);
585 * Disconnect from the given neighbour.
588 * @param key hash of neighbour's public key (not used)
589 * @param value the 'struct NeighbourMapEntry' of the neighbour
592 disconnect_all_neighbours (void *cls, const GNUNET_HashCode * key, void *value)
594 struct NeighbourMapEntry *n = value;
597 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s', %s\n",
598 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
600 if (GNUNET_YES == n->is_connected)
601 GNUNET_STATISTICS_update (GST_stats,
602 gettext_noop ("# peers disconnected due to global disconnect"), 1,
604 disconnect_neighbour (n);
610 * Cleanup the neighbours subsystem.
613 GST_neighbours_stop ()
615 GNUNET_assert (neighbours != NULL);
617 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &disconnect_all_neighbours,
619 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
620 GNUNET_assert (neighbours_connected == 0);
623 connect_notify_cb = NULL;
624 disconnect_notify_cb = NULL;
629 * We tried to send a SESSION_CONNECT message to another peer. If this
630 * succeeded, we should mark the peer up. If it failed, we should tell
631 * ATS to not use this address anymore (until it is re-validated).
633 * @param cls the 'struct NeighbourMapEntry'
634 * @param success GNUNET_OK on success
637 send_connect_continuation (void *cls,
640 struct NeighbourMapEntry *n = cls;
642 if (GNUNET_YES == n->in_disconnect)
643 return; /* neighbour is going away */
644 if (GNUNET_YES != success)
646 GNUNET_ATS_address_destroyed (GST_ats,
652 disconnect_neighbour (n);
659 * For an existing neighbour record, set the active connection to
662 * @param peer identity of the peer to switch the address for
663 * @param plugin_name name of transport that delivered the PONG
664 * @param address address of the other peer, NULL if other peer
666 * @param address_len number of bytes in address
667 * @param session session to use (or NULL)
668 * @param ats performance data
669 * @param ats_count number of entries in ats (excluding 0-termination)
670 * @return GNUNET_YES if we are currently connected, GNUNET_NO if the
671 * connection is not up (yet)
674 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
675 const char *plugin_name, const void *address,
676 size_t address_len, struct Session *session,
677 const struct GNUNET_ATS_Information
678 *ats, uint32_t ats_count)
680 struct NeighbourMapEntry *n;
681 struct SessionConnectMessage connect_msg;
684 GNUNET_assert (neighbours != NULL);
685 n = lookup_neighbour (peer);
689 GNUNET_ATS_address_destroyed (GST_ats,
691 plugin_name, address,
695 was_connected = n->is_connected;
696 n->is_connected = GNUNET_YES;
697 if (GNUNET_YES != was_connected)
698 n->keepalive_task = GNUNET_SCHEDULER_add_delayed (KEEPALIVE_FREQUENCY,
699 &neighbour_keepalive_task,
703 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
704 "SWITCH! Peer `%4s' switches to plugin `%s' address '%s' session %X\n",
705 GNUNET_i2s (peer), plugin_name,
706 (address_len == 0) ? "<inbound>" : GST_plugins_a2s (plugin_name,
711 GNUNET_free_non_null (n->addr);
712 n->addr = GNUNET_malloc (address_len);
713 memcpy (n->addr, address, address_len);
714 n->addrlen = address_len;
715 n->session = session;
716 GNUNET_free_non_null (n->plugin_name);
717 n->plugin_name = GNUNET_strdup (plugin_name);
718 GNUNET_SCHEDULER_cancel (n->timeout_task);
720 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
721 &neighbour_timeout_task, n);
722 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
723 connect_msg.header.type =
724 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
725 connect_msg.reserved = htonl (0);
726 connect_msg.timestamp =
727 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
728 GST_neighbours_send (peer, &connect_msg, sizeof (connect_msg),
729 GNUNET_TIME_UNIT_FOREVER_REL,
730 &send_connect_continuation,
732 if (GNUNET_YES == was_connected)
734 /* First tell clients about connected neighbours...*/
735 neighbours_connected++;
736 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# peers connected"), 1,
738 connect_notify_cb (callback_cls, peer, ats, ats_count);
744 * Create an entry in the neighbour map for the given peer
746 * @param peer peer to create an entry for
747 * @return new neighbour map entry
749 static struct NeighbourMapEntry *
750 setup_neighbour (const struct GNUNET_PeerIdentity *peer)
752 struct NeighbourMapEntry *n;
755 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
756 "Unknown peer `%s', creating new neighbour\n",
759 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
761 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
762 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
763 MAX_BANDWIDTH_CARRY_S);
765 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
766 &neighbour_timeout_task, n);
767 GNUNET_assert (GNUNET_OK ==
768 GNUNET_CONTAINER_multihashmap_put (neighbours,
769 &n->id.hashPubKey, n,
770 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
776 * Try to create a connection to the given target (eventually).
778 * @param target peer to try to connect to
781 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
783 struct NeighbourMapEntry *n;
785 GNUNET_assert (neighbours != NULL);
787 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Trying to connect to peer `%s'\n",
788 GNUNET_i2s (target));
791 memcmp (target, &GST_my_identity,
792 sizeof (struct GNUNET_PeerIdentity)));
793 n = lookup_neighbour (target);
794 if ((NULL != n) && (GNUNET_YES == n->is_connected))
795 return; /* already connected */
797 n = setup_neighbour (target);
799 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
800 "Asking ATS for suggested address to connect to peer `%s'\n",
801 GNUNET_i2s (&n->id));
803 GNUNET_ATS_suggest_address (GST_ats, &n->id);
808 * Test if we're connected to the given peer.
810 * @param target peer to test
811 * @return GNUNET_YES if we are connected, GNUNET_NO if not
814 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
816 struct NeighbourMapEntry *n;
818 GNUNET_assert (neighbours != NULL);
820 n = lookup_neighbour (target);
821 if ((NULL == n) || (n->is_connected != GNUNET_YES))
822 return GNUNET_NO; /* not connected */
828 * A session was terminated. Take note.
830 * @param peer identity of the peer where the session died
831 * @param session session that is gone
834 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
835 struct Session *session)
837 struct NeighbourMapEntry *n;
839 GNUNET_assert (neighbours != NULL);
842 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
843 "Session %X to peer `%s' ended \n",
844 session, GNUNET_i2s (peer));
846 n = lookup_neighbour (peer);
849 if (session != n->session)
850 return; /* doesn't affect us */
853 GNUNET_free (n->addr);
858 if (GNUNET_YES != n->is_connected)
859 return; /* not connected anymore anyway, shouldn't matter */
860 /* fast disconnect unless ATS suggests a new address */
861 GNUNET_SCHEDULER_cancel (n->timeout_task);
863 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
864 &neighbour_timeout_task, n);
865 /* try QUICKLY to re-establish a connection, reduce timeout! */
866 GNUNET_ATS_suggest_address (GST_ats, peer);
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);
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 * GNUNET_SYSERR if the connection is not fully up yet
958 * @return how long to wait before reading more from this sender
960 struct GNUNET_TIME_Relative
961 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
962 *sender, ssize_t size, int *do_forward)
964 struct NeighbourMapEntry *n;
965 struct GNUNET_TIME_Relative ret;
967 GNUNET_assert (neighbours != NULL);
969 n = lookup_neighbour (sender);
972 GST_neighbours_try_connect (sender);
973 n = lookup_neighbour (sender);
976 GNUNET_STATISTICS_update (GST_stats,
978 ("# messages discarded due to lack of neighbour record"),
980 *do_forward = GNUNET_NO;
981 return GNUNET_TIME_UNIT_ZERO;
984 if (GNUNET_YES != n->is_connected)
986 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
987 _("Plugin gave us %d bytes of data but somehow the session is not marked as UP yet!\n"),
989 *do_forward = GNUNET_SYSERR;
990 return GNUNET_TIME_UNIT_ZERO;
992 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
994 n->quota_violation_count++;
996 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
997 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
998 n->in_tracker.available_bytes_per_s__,
999 n->quota_violation_count);
1001 /* Discount 32k per violation */
1002 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
1006 if (n->quota_violation_count > 0)
1008 /* try to add 32k back */
1009 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
1010 n->quota_violation_count--;
1013 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
1015 GNUNET_STATISTICS_update (GST_stats,
1017 ("# bandwidth quota violations by other peers"),
1019 *do_forward = GNUNET_NO;
1020 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
1022 *do_forward = GNUNET_YES;
1023 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 32 * 1024);
1024 if (ret.rel_value > 0)
1027 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1028 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
1029 (unsigned long long) n->in_tracker.
1030 consumption_since_last_update__,
1031 (unsigned int) n->in_tracker.available_bytes_per_s__,
1032 (unsigned long long) ret.rel_value);
1034 GNUNET_STATISTICS_update (GST_stats,
1035 gettext_noop ("# ms throttling suggested"),
1036 (int64_t) ret.rel_value, GNUNET_NO);
1043 * Keep the connection to the given neighbour alive longer,
1044 * we received a KEEPALIVE (or equivalent).
1046 * @param neighbour neighbour to keep alive
1049 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
1051 struct NeighbourMapEntry *n;
1053 GNUNET_assert (neighbours != NULL);
1055 n = lookup_neighbour (neighbour);
1058 GNUNET_STATISTICS_update (GST_stats,
1060 ("# KEEPALIVE messages discarded (not connected)"),
1064 GNUNET_SCHEDULER_cancel (n->timeout_task);
1066 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1067 &neighbour_timeout_task, n);
1072 * Change the incoming quota for the given peer.
1074 * @param neighbour identity of peer to change qutoa for
1075 * @param quota new quota
1078 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
1079 struct GNUNET_BANDWIDTH_Value32NBO quota)
1081 struct NeighbourMapEntry *n;
1083 GNUNET_assert (neighbours != NULL);
1085 n = lookup_neighbour (neighbour);
1088 GNUNET_STATISTICS_update (GST_stats,
1090 ("# SET QUOTA messages ignored (no such peer)"),
1094 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
1095 if (0 != ntohl (quota.value__))
1098 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
1099 GNUNET_i2s (&n->id), "SET_QUOTA");
1101 if (GNUNET_YES == n->is_connected)
1102 GNUNET_STATISTICS_update (GST_stats,
1103 gettext_noop ("# disconnects due to quota of 0"), 1,
1105 disconnect_neighbour (n);
1110 * Closure for the neighbours_iterate function.
1112 struct IteratorContext
1115 * Function to call on each connected neighbour.
1117 GST_NeighbourIterator cb;
1127 * Call the callback from the closure for each connected neighbour.
1129 * @param cls the 'struct IteratorContext'
1130 * @param key the hash of the public key of the neighbour
1131 * @param value the 'struct NeighbourMapEntry'
1132 * @return GNUNET_OK (continue to iterate)
1135 neighbours_iterate (void *cls, const GNUNET_HashCode * key, void *value)
1137 struct IteratorContext *ic = cls;
1138 struct NeighbourMapEntry *n = value;
1140 if (GNUNET_YES != n->is_connected)
1143 ic->cb (ic->cb_cls, &n->id, NULL, 0, n->plugin_name, n->addr, n->addrlen);
1149 * Iterate over all connected neighbours.
1151 * @param cb function to call
1152 * @param cb_cls closure for cb
1155 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
1157 struct IteratorContext ic;
1159 GNUNET_assert (neighbours != NULL);
1163 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
1168 * If we have an active connection to the given target, it must be shutdown.
1170 * @param target peer to disconnect from
1173 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
1175 struct NeighbourMapEntry *n;
1176 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1177 struct SessionDisconnectMessage disconnect_msg;
1179 GNUNET_assert (neighbours != NULL);
1181 n = lookup_neighbour (target);
1183 return; /* not active */
1184 if (GNUNET_YES == n->is_connected)
1186 /* we're actually connected, send DISCONNECT message */
1187 disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
1188 disconnect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
1189 disconnect_msg.reserved = htonl (0);
1190 disconnect_msg.purpose.size = htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1191 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
1192 sizeof (struct GNUNET_TIME_AbsoluteNBO) );
1193 disconnect_msg.purpose.purpose = htonl (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1194 disconnect_msg.timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1195 disconnect_msg.public_key = GST_my_public_key;
1196 GNUNET_assert (GNUNET_OK ==
1197 GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
1198 &disconnect_msg.purpose,
1199 &disconnect_msg.signature));
1200 papi = GST_plugins_find (n->plugin_name);
1202 papi->send (papi->cls, target, (const void *) &disconnect_msg,
1203 sizeof (disconnect_msg),
1204 UINT32_MAX /* priority */ ,
1205 GNUNET_TIME_UNIT_FOREVER_REL, n->session, n->addr, n->addrlen,
1206 GNUNET_YES, NULL, NULL);
1207 GNUNET_STATISTICS_update (GST_stats,
1208 gettext_noop ("# peers disconnected due to external request"), 1,
1210 n = lookup_neighbour (target);
1212 return; /* gone already */
1214 disconnect_neighbour (n);
1219 * We received a disconnect message from the given peer,
1220 * validate and process.
1222 * @param peer sender of the message
1223 * @param msg the disconnect message
1226 GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity *peer,
1227 const struct GNUNET_MessageHeader *msg)
1229 struct NeighbourMapEntry *n;
1230 const struct SessionDisconnectMessage *sdm;
1233 if (ntohs (msg->size) != sizeof (struct SessionDisconnectMessage))
1235 // GNUNET_break_op (0);
1236 GNUNET_STATISTICS_update (GST_stats,
1237 gettext_noop ("# disconnect messages ignored (old format)"), 1,
1241 sdm = (const struct SessionDisconnectMessage* ) msg;
1242 n = lookup_neighbour (peer);
1244 return; /* gone already */
1245 if (GNUNET_TIME_absolute_ntoh (sdm->timestamp).abs_value <=
1246 n->connect_ts.abs_value)
1248 GNUNET_STATISTICS_update (GST_stats,
1249 gettext_noop ("# disconnect messages ignored (timestamp)"), 1,
1253 GNUNET_CRYPTO_hash (&sdm->public_key,
1254 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1256 if (0 != memcmp (peer,
1258 sizeof (struct GNUNET_PeerIdentity)))
1260 GNUNET_break_op (0);
1263 if (ntohl (sdm->purpose.size) !=
1264 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1265 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
1266 sizeof (struct GNUNET_TIME_AbsoluteNBO))
1268 GNUNET_break_op (0);
1272 GNUNET_CRYPTO_rsa_verify (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT,
1277 GNUNET_break_op (0);
1280 GST_neighbours_force_disconnect (peer);
1285 * We received a 'SESSION_CONNECT' message from the other peer.
1286 * Consider switching to it.
1288 * @param message possibly a 'struct SessionConnectMessage' (check format)
1289 * @param peer identity of the peer to switch the address for
1290 * @param plugin_name name of transport that delivered the PONG
1291 * @param address address of the other peer, NULL if other peer
1293 * @param address_len number of bytes in address
1294 * @param session session to use (or NULL)
1295 * @param ats performance data
1296 * @param ats_count number of entries in ats (excluding 0-termination)
1299 GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
1300 const struct GNUNET_PeerIdentity *peer,
1301 const char *plugin_name,
1302 const char *sender_address, uint16_t sender_address_len,
1303 struct Session *session,
1304 const struct GNUNET_ATS_Information *ats,
1307 const struct SessionConnectMessage *scm;
1308 struct GNUNET_TIME_Absolute ts;
1309 struct NeighbourMapEntry *n;
1311 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
1313 GNUNET_break_op (0);
1316 scm = (const struct SessionConnectMessage *) message;
1317 GNUNET_break_op (ntohl (scm->reserved) == 0);
1318 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
1319 n = lookup_neighbour (peer);
1321 n = setup_neighbour (peer);
1322 if (ts.abs_value > n->connect_ts.abs_value)
1324 if (NULL != session)
1325 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO | GNUNET_ERROR_TYPE_BULK,
1327 "Giving ATS session %p of plugin %s for peer %s\n",
1331 GNUNET_ATS_address_update (GST_ats,
1333 plugin_name, sender_address, sender_address_len,
1334 session, ats, ats_count);
1340 /* end of file gnunet-service-transport_neighbours.c */