2 This file is part of GNUnet.
3 (C) 2010,2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
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-service-transport_blacklist.h"
35 #include "gnunet_constants.h"
36 #include "transport.h"
40 * Size of the neighbour hash map.
42 #define NEIGHBOUR_TABLE_SIZE 256
45 * How often must a peer violate bandwidth quotas before we start
46 * to simply drop its messages?
48 #define QUOTA_VIOLATION_DROP_THRESHOLD 10
51 * How often do we send KEEPALIVE messages to each of our neighbours and measure
52 * the latency with this neighbour?
53 * (idle timeout is 5 minutes or 300 seconds, so with 30s interval we
54 * send 10 keepalives in each interval, so 10 messages would need to be
55 * lost in a row for a disconnect).
57 #define KEEPALIVE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
60 #define ATS_RESPONSE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
62 #define FAST_RECONNECT_RATE GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 100)
64 #define FAST_RECONNECT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
66 #define SETUP_CONNECTION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
69 * Entry in neighbours.
71 struct NeighbourMapEntry;
73 GNUNET_NETWORK_STRUCT_BEGIN
76 * Message a peer sends to another to indicate its
77 * preference for communicating via a particular
78 * session (and the desire to establish a real
81 struct SessionConnectMessage
84 * Header of type 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT'
86 struct GNUNET_MessageHeader header;
91 uint32_t reserved GNUNET_PACKED;
94 * Absolute time at the sender. Only the most recent connect
95 * message implies which session is preferred by the sender.
97 struct GNUNET_TIME_AbsoluteNBO timestamp;
102 struct SessionDisconnectMessage
105 * Header of type 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT'
107 struct GNUNET_MessageHeader header;
112 uint32_t reserved GNUNET_PACKED;
115 * Purpose of the signature. Extends over the timestamp.
116 * Purpose should be GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DISCONNECT.
118 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
121 * Absolute time at the sender. Only the most recent connect
122 * message implies which session is preferred by the sender.
124 struct GNUNET_TIME_AbsoluteNBO timestamp;
127 * Public key of the sender.
129 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
132 * Signature of the peer that sends us the disconnect. Only
133 * valid if the timestamp is AFTER the timestamp from the
134 * corresponding 'CONNECT' message.
136 struct GNUNET_CRYPTO_RsaSignature signature;
139 GNUNET_NETWORK_STRUCT_END
142 * For each neighbour we keep a list of messages
143 * that we still want to transmit to the neighbour.
149 * This is a doubly linked list.
151 struct MessageQueue *next;
154 * This is a doubly linked list.
156 struct MessageQueue *prev;
159 * Once this message is actively being transmitted, which
160 * neighbour is it associated with?
162 struct NeighbourMapEntry *n;
165 * Function to call once we're done.
167 GST_NeighbourSendContinuation cont;
175 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
176 * stuck together in memory. Allocated at the end of this struct.
178 const char *message_buf;
181 * Size of the message buf
183 size_t message_buf_size;
186 * At what time should we fail?
188 struct GNUNET_TIME_Absolute timeout;
196 * fresh peer or completely disconnected
201 * sent CONNECT message to other peer, waiting for CONNECT_ACK
206 * received CONNECT message to other peer, sending CONNECT_ACK
211 * received ACK or payload
216 * connection ended, fast reconnect
221 * Disconnect in progress
235 * Entry in neighbours.
237 struct NeighbourMapEntry
241 * Head of list of messages we would like to send to this peer;
242 * must contain at most one message per client.
244 struct MessageQueue *messages_head;
247 * Tail of list of messages we would like to send to this peer; must
248 * contain at most one message per client.
250 struct MessageQueue *messages_tail;
253 * Are we currently trying to send a message? If so, which one?
255 struct MessageQueue *is_active;
258 * Active session for communicating with the peer.
260 struct Session *session;
263 * Address we currently use.
265 struct GNUNET_HELLO_Address *address;
268 * Address we currently use.
270 struct GNUNET_HELLO_Address *fast_reconnect_address;
274 * Identity of this neighbour.
276 struct GNUNET_PeerIdentity id;
279 * ID of task scheduled to run when this peer is about to
280 * time out (will free resources associated with the peer).
282 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
285 * ID of task scheduled to send keepalives.
287 GNUNET_SCHEDULER_TaskIdentifier keepalive_task;
290 * ID of task scheduled to run when we should try transmitting
291 * the head of the message queue.
293 GNUNET_SCHEDULER_TaskIdentifier transmission_task;
296 * Tracker for inbound bandwidth.
298 struct GNUNET_BANDWIDTH_Tracker in_tracker;
301 * Inbound bandwidth from ATS, activated when connection is up
303 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in;
306 * Inbound bandwidth from ATS, activated when connection is up
308 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out;
311 * Timestamp of the 'SESSION_CONNECT' message we got from the other peer
313 struct GNUNET_TIME_Absolute connect_ts;
316 * When did we sent the last keep-alive message?
318 struct GNUNET_TIME_Absolute keep_alive_sent;
321 * Latest calculated latency value
323 struct GNUNET_TIME_Relative latency;
327 * We asked ATS for a new address for this peer
329 GNUNET_SCHEDULER_TaskIdentifier ats_suggest;
332 * Delay for ATS request
334 GNUNET_SCHEDULER_TaskIdentifier ats_request;
337 * Task the resets the peer state after due to an pending
338 * unsuccessful connection setup
340 GNUNET_SCHEDULER_TaskIdentifier state_reset;
344 * How often has the other peer (recently) violated the inbound
345 * traffic limit? Incremented by 10 per violation, decremented by 1
346 * per non-violation (for each time interval).
348 unsigned int quota_violation_count;
352 * The current state of the peer
353 * Element of enum State
358 * Did we sent an KEEP_ALIVE message and are we expecting a response?
360 int expect_latency_response;
363 * Was the address used successfully
368 * Fast reconnect attempts for identical address
370 unsigned int fast_reconnect_attempts;
375 * All known neighbours and their HELLOs.
377 static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
380 * Closure for connect_notify_cb, disconnect_notify_cb and address_change_cb
382 static void *callback_cls;
385 * Function to call when we connected to a neighbour.
387 static GNUNET_TRANSPORT_NotifyConnect connect_notify_cb;
390 * Function to call when we disconnected from a neighbour.
392 static GNUNET_TRANSPORT_NotifyDisconnect disconnect_notify_cb;
395 * Function to call when we changed an active address of a neighbour.
397 static GNUNET_TRANSPORT_PeerIterateCallback address_change_cb;
400 * counter for connected neighbours
402 static int neighbours_connected;
405 * Lookup a neighbour entry in the neighbours hash map.
407 * @param pid identity of the peer to look up
408 * @return the entry, NULL if there is no existing record
410 static struct NeighbourMapEntry *
411 lookup_neighbour (const struct GNUNET_PeerIdentity *pid)
413 return GNUNET_CONTAINER_multihashmap_get (neighbours, &pid->hashPubKey);
417 * Disconnect from the given neighbour, clean up the record.
419 * @param n neighbour to disconnect from
422 disconnect_neighbour (struct NeighbourMapEntry *n);
424 #define change_state(n, state, ...) change (n, state, __LINE__)
427 is_connecting (struct NeighbourMapEntry *n)
429 if ((n->state > S_NOT_CONNECTED) && (n->state < S_CONNECTED))
435 is_connected (struct NeighbourMapEntry *n)
437 if (n->state == S_CONNECTED)
443 is_disconnecting (struct NeighbourMapEntry *n)
445 if (n->state == S_DISCONNECT)
451 print_state (int state)
456 return "S_CONNECTED";
459 return "S_CONNECT_RECV";
462 return "S_CONNECT_SENT";
465 return "S_DISCONNECT";
467 case S_NOT_CONNECTED:
468 return "S_NOT_CONNECTED";
470 case S_FAST_RECONNECT:
471 return "S_FAST_RECONNECT";
481 change (struct NeighbourMapEntry *n, int state, int line);
484 ats_suggest_cancel (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
488 reset_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
490 struct NeighbourMapEntry *n = cls;
495 n->state_reset = GNUNET_SCHEDULER_NO_TASK;
496 if (n->state == S_CONNECTED)
498 GNUNET_STATISTICS_update (GST_stats,
500 ("# failed connection attempts due to timeout"), 1,
502 /* resetting state */
504 if (n->state == S_FAST_RECONNECT)
506 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
507 "Fast reconnect time out, disconnecting peer `%s'\n",
508 GNUNET_i2s (&n->id));
509 disconnect_neighbour(n);
513 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
514 "State for neighbour `%s' %X changed from `%s' to `%s' in line %u\n",
515 GNUNET_i2s (&n->id), n, print_state(n->state), "S_NOT_CONNECTED", __LINE__);
517 n->state = S_NOT_CONNECTED;
519 /* destroying address */
520 if (n->address != NULL)
522 GNUNET_assert (strlen (n->address->transport_name) > 0);
523 GNUNET_ATS_address_destroyed (GST_ats, n->address, n->session);
526 /* request new address */
527 if (n->ats_suggest != GNUNET_SCHEDULER_NO_TASK)
528 GNUNET_SCHEDULER_cancel (n->ats_suggest);
530 GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT, ats_suggest_cancel,
532 GNUNET_ATS_suggest_address (GST_ats, &n->id);
536 change (struct NeighbourMapEntry *n, int state, int line)
539 /* allowed transitions */
540 int allowed = GNUNET_NO;
542 previous_state = n->state;
546 case S_NOT_CONNECTED:
547 if ((state == S_CONNECT_RECV) || (state == S_CONNECT_SENT) ||
548 (state == S_DISCONNECT))
549 allowed = GNUNET_YES;
552 allowed = GNUNET_YES;
555 allowed = GNUNET_YES;
558 if ((state == S_DISCONNECT) || (state == S_FAST_RECONNECT))
559 allowed = GNUNET_YES;
563 case S_FAST_RECONNECT:
564 if ((state == S_CONNECTED) || (state == S_DISCONNECT))
565 allowed = GNUNET_YES;
571 if (allowed == GNUNET_NO)
573 char *old = GNUNET_strdup (print_state (n->state));
574 char *new = GNUNET_strdup (print_state (state));
576 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
577 "Illegal state transition from `%s' to `%s' in line %u \n", old,
582 return GNUNET_SYSERR;
585 char *old = GNUNET_strdup (print_state (n->state));
586 char *new = GNUNET_strdup (print_state (state));
588 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
589 "State for neighbour `%s' %X changed from `%s' to `%s' in line %u\n",
590 GNUNET_i2s (&n->id), n, old, new, line);
598 case S_FAST_RECONNECT:
601 if (n->state_reset != GNUNET_SCHEDULER_NO_TASK)
602 GNUNET_SCHEDULER_cancel (n->state_reset);
604 GNUNET_SCHEDULER_add_delayed (SETUP_CONNECTION_TIMEOUT, &reset_task, n);
607 case S_NOT_CONNECTED:
609 if (GNUNET_SCHEDULER_NO_TASK != n->state_reset)
612 char *old = GNUNET_strdup (print_state (n->state));
613 char *new = GNUNET_strdup (print_state (state));
615 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
616 "Removed reset task for peer `%s' %s failed in state transition `%s' -> `%s' \n",
617 GNUNET_i2s (&n->id), GST_plugins_a2s (n->address), old, new);
621 GNUNET_assert (n->state_reset != GNUNET_SCHEDULER_NO_TASK);
622 GNUNET_SCHEDULER_cancel (n->state_reset);
623 n->state_reset = GNUNET_SCHEDULER_NO_TASK;
631 if (NULL != address_change_cb)
633 if (n->state == S_CONNECTED)
634 address_change_cb (callback_cls, &n->id, n->address);
635 else if (previous_state == S_CONNECTED)
636 address_change_cb (callback_cls, &n->id, NULL);
643 send_with_session (struct NeighbourMapEntry *n,
644 const char *msgbuf, size_t msgbuf_size,
646 struct GNUNET_TIME_Relative timeout,
647 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
649 struct GNUNET_TRANSPORT_PluginFunctions *papi;
650 size_t ret = GNUNET_SYSERR;
652 GNUNET_assert (n != NULL);
653 GNUNET_assert (n->session != NULL);
655 papi = GST_plugins_find (n->address->transport_name);
659 cont (cont_cls, &n->id, GNUNET_SYSERR);
660 return GNUNET_SYSERR;
663 ret = papi->send (papi->cls,
670 if ((ret == -1) && (cont != NULL))
671 cont (cont_cls, &n->id, GNUNET_SYSERR);
676 * Task invoked to start a transmission to another peer.
678 * @param cls the 'struct NeighbourMapEntry'
679 * @param tc scheduler context
682 transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
686 * We're done with our transmission attempt, continue processing.
688 * @param cls the 'struct MessageQueue' of the message
689 * @param receiver intended receiver
690 * @param success whether it worked or not
693 transmit_send_continuation (void *cls,
694 const struct GNUNET_PeerIdentity *receiver,
697 struct MessageQueue *mq = cls;
698 struct NeighbourMapEntry *n;
699 struct NeighbourMapEntry *tmp;
701 tmp = lookup_neighbour (receiver);
703 if ((NULL != n) && (tmp != NULL) && (tmp == n))
705 GNUNET_assert (n->is_active == mq);
707 if (success == GNUNET_YES)
709 GNUNET_assert (n->transmission_task == GNUNET_SCHEDULER_NO_TASK);
710 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
713 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending message of type %u was %s\n",
714 ntohs (((struct GNUNET_MessageHeader *) mq->message_buf)->type),
715 (success == GNUNET_OK) ? "successful" : "FAILED");
716 if (NULL != mq->cont)
717 mq->cont (mq->cont_cls, success);
723 * Check the ready list for the given neighbour and if a plugin is
724 * ready for transmission (and if we have a message), do so!
726 * @param n target peer for which to transmit
729 try_transmission_to_peer (struct NeighbourMapEntry *n)
731 struct MessageQueue *mq;
732 struct GNUNET_TIME_Relative timeout;
735 if (n->is_active != NULL)
738 return; /* transmission already pending */
740 if (n->transmission_task != GNUNET_SCHEDULER_NO_TASK)
743 return; /* currently waiting for bandwidth */
745 while (NULL != (mq = n->messages_head))
747 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
748 if (timeout.rel_value > 0)
750 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
753 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR); /* timeout */
756 return; /* no more messages */
758 if (n->address == NULL)
760 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "No address for peer `%s'\n",
761 GNUNET_i2s (&n->id));
762 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
763 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);
764 GNUNET_assert (n->transmission_task == GNUNET_SCHEDULER_NO_TASK);
765 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
769 if (GST_plugins_find (n->address->transport_name) == NULL)
774 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
778 if ((n->address->address_length == 0) && (n->session == NULL))
780 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "No address for peer `%s'\n",
781 GNUNET_i2s (&n->id));
782 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);
783 GNUNET_assert (n->transmission_task == GNUNET_SCHEDULER_NO_TASK);
784 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
788 ret = send_with_session(n,
789 mq->message_buf, mq->message_buf_size,
791 &transmit_send_continuation, mq);
795 /* failure, but 'send' would not call continuation in this case,
796 * so we need to do it here! */
797 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR);
804 * Task invoked to start a transmission to another peer.
806 * @param cls the 'struct NeighbourMapEntry'
807 * @param tc scheduler context
810 transmission_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
812 struct NeighbourMapEntry *n = cls;
814 GNUNET_assert (NULL != lookup_neighbour (&n->id));
815 n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
816 try_transmission_to_peer (n);
821 * Initialize the neighbours subsystem.
823 * @param cls closure for callbacks
824 * @param connect_cb function to call if we connect to a peer
825 * @param disconnect_cb function to call if we disconnect from a peer
826 * @param peer_address_cb function to call if we change an active address
830 GST_neighbours_start (void *cls,
831 GNUNET_TRANSPORT_NotifyConnect connect_cb,
832 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb,
833 GNUNET_TRANSPORT_PeerIterateCallback peer_address_cb)
836 connect_notify_cb = connect_cb;
837 disconnect_notify_cb = disconnect_cb;
838 address_change_cb = peer_address_cb;
839 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
840 neighbours_connected = 0;
845 send_disconnect_cont (void *cls, const struct GNUNET_PeerIdentity *target,
848 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
849 "Sending DISCONNECT message to peer `%4s': %i\n",
850 GNUNET_i2s (target), result);
855 send_disconnect (struct NeighbourMapEntry * n)
858 struct SessionDisconnectMessage disconnect_msg;
860 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
861 "Sending DISCONNECT message to peer `%4s'\n",
862 GNUNET_i2s (&n->id));
863 disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
864 disconnect_msg.header.type =
865 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
866 disconnect_msg.reserved = htonl (0);
867 disconnect_msg.purpose.size =
868 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
869 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
870 sizeof (struct GNUNET_TIME_AbsoluteNBO));
871 disconnect_msg.purpose.purpose =
872 htonl (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
873 disconnect_msg.timestamp =
874 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
875 disconnect_msg.public_key = GST_my_public_key;
876 GNUNET_assert (GNUNET_OK ==
877 GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
878 &disconnect_msg.purpose,
879 &disconnect_msg.signature));
881 ret = send_with_session (n,
882 (const char *) &disconnect_msg, sizeof (disconnect_msg),
883 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
884 &send_disconnect_cont, NULL);
886 if (ret == GNUNET_SYSERR)
887 return GNUNET_SYSERR;
889 GNUNET_STATISTICS_update (GST_stats,
891 ("# peers disconnected due to external request"), 1,
898 * Disconnect from the given neighbour, clean up the record.
900 * @param n neighbour to disconnect from
903 disconnect_neighbour (struct NeighbourMapEntry *n)
905 struct MessageQueue *mq;
908 previous_state = n->state;
910 if (is_disconnecting (n))
913 /* send DISCONNECT MESSAGE */
914 if (previous_state == S_CONNECTED)
916 if (GNUNET_OK == send_disconnect (n))
917 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sent DISCONNECT_MSG to `%s'\n",
918 GNUNET_i2s (&n->id));
920 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
921 "Could not send DISCONNECT_MSG to `%s'\n",
922 GNUNET_i2s (&n->id));
925 change_state (n, S_DISCONNECT);
927 if (previous_state == S_CONNECTED)
929 GNUNET_assert (NULL != n->address);
930 if (n->address_state == USED)
932 GST_validation_set_address_use (n->address, n->session, GNUNET_NO, __LINE__);
933 GNUNET_ATS_address_in_use (GST_ats, n->address, n->session, GNUNET_NO);
934 n->address_state = UNUSED;
938 if (n->address != NULL)
940 struct GNUNET_TRANSPORT_PluginFunctions *papi;
942 papi = GST_plugins_find (n->address->transport_name);
944 papi->disconnect (papi->cls, &n->id);
946 while (NULL != (mq = n->messages_head))
948 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
949 if (NULL != mq->cont)
950 mq->cont (mq->cont_cls, GNUNET_SYSERR);
953 if (NULL != n->is_active)
955 n->is_active->n = NULL;
956 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
957 "Failing transmission of active message due to disconnect\n");
958 if (NULL != n->is_active->cont)
959 n->is_active->cont (n->is_active->cont_cls, GNUNET_SYSERR);
960 GNUNET_free (n->is_active);
964 switch (previous_state)
967 GNUNET_assert (neighbours_connected > 0);
968 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != n->keepalive_task);
969 GNUNET_SCHEDULER_cancel (n->keepalive_task);
970 n->keepalive_task = GNUNET_SCHEDULER_NO_TASK;
971 n->expect_latency_response = GNUNET_NO;
972 neighbours_connected--;
973 GNUNET_STATISTICS_set (GST_stats, gettext_noop ("# peers connected"), neighbours_connected,
975 disconnect_notify_cb (callback_cls, &n->id);
977 case S_FAST_RECONNECT:
978 GNUNET_STATISTICS_update (GST_stats,
979 gettext_noop ("# fast reconnects failed"), 1,
981 disconnect_notify_cb (callback_cls, &n->id);
987 GNUNET_ATS_suggest_address_cancel (GST_ats, &n->id);
989 GNUNET_assert (GNUNET_YES ==
990 GNUNET_CONTAINER_multihashmap_remove (neighbours,
991 &n->id.hashPubKey, n));
992 if (GNUNET_SCHEDULER_NO_TASK != n->ats_suggest)
994 GNUNET_SCHEDULER_cancel (n->ats_suggest);
995 n->ats_suggest = GNUNET_SCHEDULER_NO_TASK;
997 if (n->ats_request != GNUNET_SCHEDULER_NO_TASK)
999 GNUNET_SCHEDULER_cancel (n->ats_request);
1000 n->ats_request = GNUNET_SCHEDULER_NO_TASK;
1003 if (GNUNET_SCHEDULER_NO_TASK != n->timeout_task)
1005 GNUNET_SCHEDULER_cancel (n->timeout_task);
1006 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1008 if (GNUNET_SCHEDULER_NO_TASK != n->transmission_task)
1010 GNUNET_SCHEDULER_cancel (n->transmission_task);
1011 n->transmission_task = GNUNET_SCHEDULER_NO_TASK;
1013 if (NULL != n->fast_reconnect_address)
1015 GNUNET_HELLO_address_free (n->fast_reconnect_address);
1016 n->fast_reconnect_address = NULL;
1018 if (NULL != n->address)
1020 GNUNET_HELLO_address_free (n->address);
1024 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Deleting peer `%4s', %X\n",
1025 GNUNET_i2s (&n->id), n);
1031 * Peer has been idle for too long. Disconnect.
1033 * @param cls the 'struct NeighbourMapEntry' of the neighbour that went idle
1034 * @param tc scheduler context
1037 neighbour_timeout_task (void *cls,
1038 const struct GNUNET_SCHEDULER_TaskContext *tc)
1040 struct NeighbourMapEntry *n = cls;
1042 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1043 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Peer`%4s' disconnected due to timeout\n",
1044 GNUNET_i2s (&n->id));
1046 GNUNET_STATISTICS_update (GST_stats,
1048 ("# peers disconnected due to timeout"), 1,
1050 disconnect_neighbour (n);
1055 * Send another keepalive message.
1057 * @param cls the 'struct NeighbourMapEntry' of the neighbour that went idle
1058 * @param tc scheduler context
1061 neighbour_keepalive_task (void *cls,
1062 const struct GNUNET_SCHEDULER_TaskContext *tc)
1064 struct NeighbourMapEntry *n = cls;
1065 struct GNUNET_MessageHeader m;
1068 GNUNET_assert (S_CONNECTED == n->state);
1070 GNUNET_SCHEDULER_add_delayed (KEEPALIVE_FREQUENCY,
1071 &neighbour_keepalive_task, n);
1073 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# keepalives sent"), 1,
1075 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1076 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
1078 ret = send_with_session (n,
1079 (const void *) &m, sizeof (m),
1080 UINT32_MAX /* priority */ ,
1081 GNUNET_TIME_UNIT_FOREVER_REL,
1084 n->expect_latency_response = GNUNET_NO;
1085 n->keep_alive_sent = GNUNET_TIME_absolute_get_zero ();
1086 if (ret != GNUNET_SYSERR)
1088 n->expect_latency_response = GNUNET_YES;
1089 n->keep_alive_sent = GNUNET_TIME_absolute_get ();
1096 * Disconnect from the given neighbour.
1099 * @param key hash of neighbour's public key (not used)
1100 * @param value the 'struct NeighbourMapEntry' of the neighbour
1103 disconnect_all_neighbours (void *cls, const GNUNET_HashCode * key, void *value)
1105 struct NeighbourMapEntry *n = value;
1107 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s', %s\n",
1108 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
1109 if (S_CONNECTED == n->state)
1110 GNUNET_STATISTICS_update (GST_stats,
1112 ("# peers disconnected due to global disconnect"),
1114 disconnect_neighbour (n);
1120 ats_suggest_cancel (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1122 struct NeighbourMapEntry *n = cls;
1124 n->ats_suggest = GNUNET_SCHEDULER_NO_TASK;
1126 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1127 "ATS did not suggested address to connect to peer `%s'\n",
1128 GNUNET_i2s (&n->id));
1130 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# ATS address suggestions failed"), 1,
1134 disconnect_neighbour (n);
1138 * Cleanup the neighbours subsystem.
1141 GST_neighbours_stop ()
1143 // This can happen during shutdown
1144 if (neighbours == NULL)
1149 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &disconnect_all_neighbours,
1151 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
1152 // GNUNET_assert (neighbours_connected == 0);
1154 callback_cls = NULL;
1155 connect_notify_cb = NULL;
1156 disconnect_notify_cb = NULL;
1157 address_change_cb = NULL;
1160 struct ContinutionContext
1162 struct GNUNET_HELLO_Address *address;
1164 struct Session *session;
1168 send_outbound_quota (const struct GNUNET_PeerIdentity *target,
1169 struct GNUNET_BANDWIDTH_Value32NBO quota)
1171 struct QuotaSetMessage q_msg;
1173 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1174 "Sending outbound quota of %u Bps for peer `%s' to all clients\n",
1175 ntohl (quota.value__), GNUNET_i2s (target));
1176 q_msg.header.size = htons (sizeof (struct QuotaSetMessage));
1177 q_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
1178 q_msg.quota = quota;
1179 q_msg.peer = (*target);
1180 GST_clients_broadcast (&q_msg.header, GNUNET_NO);
1184 * We tried to send a SESSION_CONNECT message to another peer. If this
1185 * succeeded, we change the state. If it failed, we should tell
1186 * ATS to not use this address anymore (until it is re-validated).
1188 * @param cls the 'struct GNUNET_HELLO_Address' of the address that was tried
1189 * @param target peer to send the message to
1190 * @param success GNUNET_OK on success
1193 send_connect_continuation (void *cls, const struct GNUNET_PeerIdentity *target,
1196 struct ContinutionContext *cc = cls;
1197 struct NeighbourMapEntry *n = lookup_neighbour (&cc->address->peer);
1199 if (GNUNET_YES != success)
1201 GNUNET_assert (strlen (cc->address->transport_name) > 0);
1202 GNUNET_ATS_address_destroyed (GST_ats, cc->address, cc->session);
1204 if ((NULL == neighbours) || (NULL == n) || (n->state == S_DISCONNECT))
1206 GNUNET_HELLO_address_free (cc->address);
1211 if ((GNUNET_YES == success) &&
1212 ((n->state == S_NOT_CONNECTED) || (n->state == S_CONNECT_SENT)))
1214 change_state (n, S_CONNECT_SENT);
1215 GNUNET_HELLO_address_free (cc->address);
1220 if ((GNUNET_NO == success) &&
1221 ((n->state == S_NOT_CONNECTED) || (n->state == S_CONNECT_SENT)))
1223 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1224 "Failed to send CONNECT_MSG to peer `%4s' with address '%s' session %p, asking ATS for new address \n",
1225 GNUNET_i2s (&n->id), GST_plugins_a2s (n->address), n->session);
1226 change_state (n, S_NOT_CONNECTED);
1227 if (n->ats_suggest != GNUNET_SCHEDULER_NO_TASK)
1228 GNUNET_SCHEDULER_cancel (n->ats_suggest);
1230 GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT, &ats_suggest_cancel,
1232 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1234 GNUNET_HELLO_address_free (cc->address);
1240 ats_request (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1242 struct NeighbourMapEntry *n = cls;
1243 n->ats_request = GNUNET_SCHEDULER_NO_TASK;
1246 GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT, ats_suggest_cancel,
1252 * We tried to switch addresses with an peer already connected. If it failed,
1253 * we should tell ATS to not use this address anymore (until it is re-validated).
1255 * @param cls the 'struct NeighbourMapEntry'
1256 * @param target peer to send the message to
1257 * @param success GNUNET_OK on success
1260 send_switch_address_continuation (void *cls,
1261 const struct GNUNET_PeerIdentity *target,
1264 struct ContinutionContext *cc = cls;
1265 struct NeighbourMapEntry *n;
1267 if (neighbours == NULL)
1269 GNUNET_HELLO_address_free (cc->address);
1271 return; /* neighbour is going away */
1274 n = lookup_neighbour (&cc->address->peer);
1275 if ((n == NULL) || (is_disconnecting (n)))
1277 GNUNET_HELLO_address_free (cc->address);
1279 return; /* neighbour is going away */
1282 GNUNET_assert ((n->state == S_CONNECTED) || (n->state == S_FAST_RECONNECT));
1283 if (GNUNET_YES != success)
1286 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1287 "Failed to switch connected peer `%s' in state %s to address '%s' session %X, asking ATS for new address \n",
1288 GNUNET_i2s (&n->id), print_state(n->state), GST_plugins_a2s (cc->address), cc->session);
1290 GNUNET_assert (strlen (cc->address->transport_name) > 0);
1291 GNUNET_ATS_address_destroyed (GST_ats, cc->address, cc->session);
1293 if (n->ats_suggest != GNUNET_SCHEDULER_NO_TASK)
1295 GNUNET_SCHEDULER_cancel (n->ats_suggest);
1296 n->ats_suggest = GNUNET_SCHEDULER_NO_TASK;
1299 if (n->state == S_FAST_RECONNECT)
1301 if (GNUNET_SCHEDULER_NO_TASK == n->ats_request)
1303 /* Throtteled ATS request for fast reconnect */
1304 struct GNUNET_TIME_Relative delay = GNUNET_TIME_relative_multiply(FAST_RECONNECT_RATE, n->fast_reconnect_attempts);
1305 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1306 "Fast reconnect attempt %u failed, delay ATS request for %llu ms\n", n->fast_reconnect_attempts, delay.rel_value);
1308 GNUNET_SCHEDULER_add_delayed (delay,
1315 /* Immediate ATS request for connected peers */
1317 GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT, ats_suggest_cancel,
1319 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1321 GNUNET_HELLO_address_free (cc->address);
1325 /* Tell ATS that switching addresses was successful */
1329 if (n->address_state == FRESH)
1331 GST_validation_set_address_use (cc->address, cc->session, GNUNET_YES, __LINE__);
1332 GNUNET_ATS_address_update (GST_ats, cc->address, cc->session, NULL, 0);
1333 GNUNET_break (cc->session == n->session);
1334 GNUNET_ATS_address_in_use (GST_ats, cc->address, cc->session, GNUNET_YES);
1335 n->address_state = USED;
1338 case S_FAST_RECONNECT:
1339 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1340 "Successful fast reconnect to peer `%s'\n",
1341 GNUNET_i2s (&n->id));
1342 change_state (n, S_CONNECTED);
1343 neighbours_connected++;
1344 GNUNET_STATISTICS_set (GST_stats, gettext_noop ("# peers connected"), neighbours_connected,
1347 if (n->address_state == FRESH)
1349 GST_validation_set_address_use (cc->address, cc->session, GNUNET_YES, __LINE__);
1350 GNUNET_ATS_address_update (GST_ats, cc->address, cc->session, NULL, 0);
1351 GNUNET_ATS_address_in_use (GST_ats, cc->address, cc->session, GNUNET_YES);
1352 n->address_state = USED;
1355 if (n->keepalive_task == GNUNET_SCHEDULER_NO_TASK)
1357 GNUNET_SCHEDULER_add_now (&neighbour_keepalive_task, n);
1359 /* Updating quotas */
1360 GST_neighbours_set_incoming_quota (&n->id, n->bandwidth_in);
1361 send_outbound_quota (target, n->bandwidth_out);
1366 GNUNET_HELLO_address_free (cc->address);
1372 * We tried to send a SESSION_CONNECT message to another peer. If this
1373 * succeeded, we change the state. If it failed, we should tell
1374 * ATS to not use this address anymore (until it is re-validated).
1376 * @param cls the 'struct NeighbourMapEntry'
1377 * @param target peer to send the message to
1378 * @param success GNUNET_OK on success
1381 send_connect_ack_continuation (void *cls,
1382 const struct GNUNET_PeerIdentity *target,
1385 struct ContinutionContext *cc = cls;
1386 struct NeighbourMapEntry *n;
1388 if (neighbours == NULL)
1390 GNUNET_HELLO_address_free (cc->address);
1392 return; /* neighbour is going away */
1395 n = lookup_neighbour (&cc->address->peer);
1396 if ((n == NULL) || (is_disconnecting (n)))
1398 GNUNET_HELLO_address_free (cc->address);
1400 return; /* neighbour is going away */
1403 if (GNUNET_YES == success)
1405 GNUNET_HELLO_address_free (cc->address);
1407 return; /* sending successful */
1410 /* sending failed, ask for next address */
1411 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1412 "Failed to send CONNECT_MSG to peer `%4s' with address '%s' session %X, asking ATS for new address \n",
1413 GNUNET_i2s (&n->id), GST_plugins_a2s (n->address), n->session);
1414 if (n->state != S_NOT_CONNECTED)
1415 change_state (n, S_NOT_CONNECTED);
1416 GNUNET_assert (strlen (cc->address->transport_name) > 0);
1417 GNUNET_ATS_address_destroyed (GST_ats, cc->address, cc->session);
1419 if (n->ats_suggest != GNUNET_SCHEDULER_NO_TASK)
1420 GNUNET_SCHEDULER_cancel (n->ats_suggest);
1422 GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT, ats_suggest_cancel,
1424 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1425 GNUNET_HELLO_address_free (cc->address);
1431 * For an existing neighbour record, set the active connection to
1432 * use the given address.
1434 * @param peer identity of the peer to switch the address for
1435 * @param address address of the other peer, NULL if other peer
1437 * @param session session to use (or NULL)
1438 * @param ats performance data
1439 * @param ats_count number of entries in ats
1440 * @param bandwidth_in inbound quota to be used when connection is up
1441 * @param bandwidth_out outbound quota to be used when connection is up
1442 * @return GNUNET_YES if we are currently connected, GNUNET_NO if the
1443 * connection is not up (yet)
1446 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
1447 const struct GNUNET_HELLO_Address
1449 struct Session *session,
1450 const struct GNUNET_ATS_Information *ats,
1452 struct GNUNET_BANDWIDTH_Value32NBO
1454 struct GNUNET_BANDWIDTH_Value32NBO
1457 struct NeighbourMapEntry *n;
1458 struct SessionConnectMessage connect_msg;
1459 struct ContinutionContext *cc;
1463 if (neighbours == NULL)
1465 /* This can happen during shutdown */
1468 n = lookup_neighbour (peer);
1471 if (n->state == S_DISCONNECT)
1473 /* We are disconnecting, nothing to do here */
1476 GNUNET_assert (address->transport_name != NULL);
1477 if ((session == NULL) && (0 == address->address_length))
1479 GNUNET_break_op (0);
1480 /* FIXME: is this actually possible? When does this happen? */
1481 if (strlen (address->transport_name) > 0)
1482 GNUNET_ATS_address_destroyed (GST_ats, address, session);
1483 GNUNET_ATS_suggest_address (GST_ats, peer);
1487 /* checks successful and neighbour != NULL */
1488 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1489 "ATS tells us to switch to address '%s' session %p for peer `%s' in state `%s'\n",
1490 (address->address_length != 0) ? GST_plugins_a2s (address): "<inbound>",
1493 print_state (n->state));
1495 if (n->ats_suggest != GNUNET_SCHEDULER_NO_TASK)
1497 GNUNET_SCHEDULER_cancel (n->ats_suggest);
1498 n->ats_suggest = GNUNET_SCHEDULER_NO_TASK;
1502 if (n->state == S_FAST_RECONNECT)
1504 /* Throtteled fast reconnect */
1506 if (NULL == n->fast_reconnect_address)
1508 n->fast_reconnect_address = GNUNET_HELLO_address_copy (address);
1511 else if (0 == GNUNET_HELLO_address_cmp(address, n->fast_reconnect_address))
1513 n->fast_reconnect_attempts ++;
1515 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1516 "FAST RECONNECT to peer `%s' and address '%s' with identical address attempt %u\n",
1517 GNUNET_i2s (&n->id), GST_plugins_a2s (address), n->fast_reconnect_attempts);
1522 n->fast_reconnect_attempts = 0;
1525 /* do not switch addresses just update quotas */
1526 if ((n->state == S_CONNECTED) && (NULL != n->address) &&
1527 (0 == GNUNET_HELLO_address_cmp (address, n->address)) &&
1528 (n->session == session))
1530 n->bandwidth_in = bandwidth_in;
1531 n->bandwidth_out = bandwidth_out;
1532 GST_neighbours_set_incoming_quota (&n->id, n->bandwidth_in);
1533 send_outbound_quota (peer, n->bandwidth_out);
1536 if (n->state == S_CONNECTED)
1538 /* mark old address as no longer used */
1539 GNUNET_assert (NULL != n->address);
1540 if (n->address_state == USED)
1542 GST_validation_set_address_use (n->address, n->session, GNUNET_NO, __LINE__);
1543 GNUNET_ATS_address_in_use (GST_ats, n->address, n->session, GNUNET_NO);
1544 n->address_state = UNUSED;
1548 /* set new address */
1549 if (NULL != n->address)
1550 GNUNET_HELLO_address_free (n->address);
1551 n->address = GNUNET_HELLO_address_copy (address);
1552 n->address_state = FRESH;
1553 n->bandwidth_in = bandwidth_in;
1554 n->bandwidth_out = bandwidth_out;
1555 GNUNET_SCHEDULER_cancel (n->timeout_task);
1557 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1558 &neighbour_timeout_task, n);
1560 if (NULL != address_change_cb && n->state == S_CONNECTED)
1561 address_change_cb (callback_cls, &n->id, n->address);
1563 /* Obtain an session for this address from plugin */
1564 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1565 papi = GST_plugins_find (address->transport_name);
1569 /* we don't have the plugin for this address */
1570 GNUNET_ATS_address_destroyed (GST_ats, n->address, NULL);
1572 if (n->ats_suggest != GNUNET_SCHEDULER_NO_TASK)
1573 GNUNET_SCHEDULER_cancel (n->ats_suggest);
1574 n->ats_suggest = GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT,
1577 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1578 GNUNET_HELLO_address_free (n->address);
1584 if (session == NULL)
1586 n->session = papi->get_session (papi->cls, address);
1587 /* Session could not be initiated */
1588 if (n->session == NULL)
1590 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1591 "Failed to obtain new session %p for peer `%s' and address '%s'\n",
1592 n->session, GNUNET_i2s (&n->id), GST_plugins_a2s (n->address));
1594 GNUNET_ATS_address_destroyed (GST_ats, n->address, NULL);
1596 if (n->ats_suggest != GNUNET_SCHEDULER_NO_TASK)
1597 GNUNET_SCHEDULER_cancel (n->ats_suggest);
1598 n->ats_suggest = GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT,
1601 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1602 GNUNET_HELLO_address_free (n->address);
1608 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1609 "Obtained new session %p for peer `%s' and address '%s'\n",
1610 n->session, GNUNET_i2s (&n->id), GST_plugins_a2s (n->address));
1611 /* Telling ATS about new session */
1612 GNUNET_ATS_address_update (GST_ats, n->address, n->session, NULL, 0);
1616 n->session = session;
1617 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1618 "Using existing session %p for peer `%s' and address '%s'\n",
1620 GNUNET_i2s (&n->id),
1621 (address->address_length != 0) ? GST_plugins_a2s (address): "<inbound>");
1626 case S_NOT_CONNECTED:
1627 case S_CONNECT_SENT:
1628 msg_len = sizeof (struct SessionConnectMessage);
1629 connect_msg.header.size = htons (msg_len);
1630 connect_msg.header.type =
1631 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
1632 connect_msg.reserved = htonl (0);
1633 connect_msg.timestamp =
1634 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1636 cc = GNUNET_malloc (sizeof (struct ContinutionContext));
1637 cc->session = n->session;
1638 cc->address = GNUNET_HELLO_address_copy (address);
1639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1640 "Sending CONNECT message to %s\n",
1641 GNUNET_i2s (&n->id));
1642 if (n->state != S_CONNECT_RECV)
1643 change_state (n, S_CONNECT_RECV);
1644 ret = send_with_session (n,
1645 (const char *) &connect_msg, msg_len,
1646 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
1647 &send_connect_continuation, cc);
1650 case S_CONNECT_RECV:
1651 /* We received a CONNECT message and asked ATS for an address */
1652 msg_len = sizeof (struct SessionConnectMessage);
1653 connect_msg.header.size = htons (msg_len);
1654 connect_msg.header.type =
1655 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK);
1656 connect_msg.reserved = htonl (0);
1657 connect_msg.timestamp =
1658 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1659 cc = GNUNET_malloc (sizeof (struct ContinutionContext));
1660 cc->session = n->session;
1661 cc->address = GNUNET_HELLO_address_copy (address);
1663 ret = send_with_session(n,
1664 (const void *) &connect_msg, msg_len,
1665 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
1666 &send_connect_ack_continuation,
1670 case S_FAST_RECONNECT:
1671 /* connected peer is switching addresses or tries fast reconnect */
1672 msg_len = sizeof (struct SessionConnectMessage);
1673 connect_msg.header.size = htons (msg_len);
1674 connect_msg.header.type =
1675 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
1676 connect_msg.reserved = htonl (0);
1677 connect_msg.timestamp =
1678 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1679 cc = GNUNET_malloc (sizeof (struct ContinutionContext));
1680 cc->session = n->session;
1681 cc->address = GNUNET_HELLO_address_copy (address);
1682 ret = send_with_session(n,
1683 (const void *) &connect_msg, msg_len,
1684 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
1685 &send_switch_address_continuation, cc);
1686 if (ret == GNUNET_SYSERR)
1688 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1689 "Failed to send CONNECT_MESSAGE to `%4s' using address '%s' session %X\n",
1690 GNUNET_i2s (peer), GST_plugins_a2s (address), session);
1694 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1695 "Invalid connection state to switch addresses %u \n", n->state);
1696 GNUNET_break_op (0);
1703 * Obtain current latency information for the given neighbour.
1706 * @return observed latency of the address, FOREVER if the address was
1707 * never successfully validated
1709 struct GNUNET_TIME_Relative
1710 GST_neighbour_get_latency (const struct GNUNET_PeerIdentity *peer)
1712 struct NeighbourMapEntry *n;
1714 n = lookup_neighbour (peer);
1715 if ((NULL == n) || ((n->address == NULL) && (n->session == NULL)))
1716 return GNUNET_TIME_UNIT_FOREVER_REL;
1722 * Obtain current address information for the given neighbour.
1725 * @return address currently used
1727 struct GNUNET_HELLO_Address *
1728 GST_neighbour_get_current_address (const struct GNUNET_PeerIdentity *peer)
1730 struct NeighbourMapEntry *n;
1732 n = lookup_neighbour (peer);
1733 if ((NULL == n) || ((n->address == NULL) && (n->session == NULL)))
1742 * Create an entry in the neighbour map for the given peer
1744 * @param peer peer to create an entry for
1745 * @return new neighbour map entry
1747 static struct NeighbourMapEntry *
1748 setup_neighbour (const struct GNUNET_PeerIdentity *peer)
1750 struct NeighbourMapEntry *n;
1752 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1753 "Unknown peer `%s', creating new neighbour\n", GNUNET_i2s (peer));
1754 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
1756 n->state = S_NOT_CONNECTED;
1757 n->latency = GNUNET_TIME_relative_get_forever ();
1758 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
1759 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
1760 MAX_BANDWIDTH_CARRY_S);
1762 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1763 &neighbour_timeout_task, n);
1764 GNUNET_assert (GNUNET_OK ==
1765 GNUNET_CONTAINER_multihashmap_put (neighbours,
1766 &n->id.hashPubKey, n,
1767 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1773 * Try to create a connection to the given target (eventually).
1775 * @param target peer to try to connect to
1778 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
1780 struct NeighbourMapEntry *n;
1782 // This can happen during shutdown
1783 if (neighbours == NULL)
1787 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Trying to connect to peer `%s'\n",
1788 GNUNET_i2s (target));
1790 memcmp (target, &GST_my_identity, sizeof (struct GNUNET_PeerIdentity)))
1795 n = lookup_neighbour (target);
1799 if ((S_CONNECTED == n->state) || (is_connecting (n)))
1800 return; /* already connecting or connected */
1801 if (is_disconnecting (n))
1802 change_state (n, S_NOT_CONNECTED);
1807 n = setup_neighbour (target);
1808 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1809 "Asking ATS for suggested address to connect to peer `%s'\n",
1810 GNUNET_i2s (&n->id));
1811 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1815 * Test if we're connected to the given peer.
1817 * @param target peer to test
1818 * @return GNUNET_YES if we are connected, GNUNET_NO if not
1821 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
1823 struct NeighbourMapEntry *n;
1825 // This can happen during shutdown
1826 if (neighbours == NULL)
1831 n = lookup_neighbour (target);
1833 if ((NULL == n) || (S_CONNECTED != n->state))
1834 return GNUNET_NO; /* not connected */
1839 * A session was terminated. Take note.
1841 * @param peer identity of the peer where the session died
1842 * @param session session that is gone
1845 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
1846 struct Session *session)
1848 struct NeighbourMapEntry *n;
1850 if (neighbours == NULL)
1852 /* This can happen during shutdown */
1855 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Session %X to peer `%s' ended \n",
1856 session, GNUNET_i2s (peer));
1857 n = lookup_neighbour (peer);
1860 if (session != n->session)
1861 return; /* doesn't affect us */
1862 if (n->state == S_CONNECTED)
1864 if (n->address_state == USED)
1866 GST_validation_set_address_use (n->address, n->session, GNUNET_NO, __LINE__);
1867 GNUNET_ATS_address_in_use (GST_ats, n->address, n->session, GNUNET_NO);
1868 n->address_state = UNUSED;
1873 if (NULL != n->address)
1875 GNUNET_HELLO_address_free (n->address);
1880 /* not connected anymore anyway, shouldn't matter */
1881 if (S_CONNECTED != n->state)
1884 if (n->keepalive_task != GNUNET_SCHEDULER_NO_TASK)
1886 GNUNET_SCHEDULER_cancel (n->keepalive_task);
1887 n->keepalive_task = GNUNET_SCHEDULER_NO_TASK;
1888 n->expect_latency_response = GNUNET_NO;
1891 /* connected, try fast reconnect */
1892 /* statistics "transport" : "# peers connected" -= 1
1893 * neighbours_connected -= 1
1894 * BUT: no disconnect_cb to notify clients about disconnect
1897 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Trying fast reconnect to peer `%s'\n",
1900 GNUNET_assert (neighbours_connected > 0);
1901 change_state (n, S_FAST_RECONNECT);
1902 neighbours_connected--;
1903 GNUNET_STATISTICS_set (GST_stats, gettext_noop ("# peers connected"), neighbours_connected,
1907 /* We are connected, so ask ATS to switch addresses */
1908 GNUNET_SCHEDULER_cancel (n->timeout_task);
1909 n->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
1910 &neighbour_timeout_task, n);
1911 /* try QUICKLY to re-establish a connection, reduce timeout! */
1912 if (n->ats_suggest != GNUNET_SCHEDULER_NO_TASK)
1913 GNUNET_SCHEDULER_cancel (n->ats_suggest);
1914 n->ats_suggest = GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT,
1915 &ats_suggest_cancel,
1917 GNUNET_ATS_suggest_address (GST_ats, peer);
1922 * Transmit a message to the given target using the active connection.
1924 * @param target destination
1925 * @param msg message to send
1926 * @param msg_size number of bytes in msg
1927 * @param timeout when to fail with timeout
1928 * @param cont function to call when done
1929 * @param cont_cls closure for 'cont'
1932 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
1933 size_t msg_size, struct GNUNET_TIME_Relative timeout,
1934 GST_NeighbourSendContinuation cont, void *cont_cls)
1936 struct NeighbourMapEntry *n;
1937 struct MessageQueue *mq;
1939 // This can happen during shutdown
1940 if (neighbours == NULL)
1945 n = lookup_neighbour (target);
1946 if ((n == NULL) || (!is_connected (n)))
1948 GNUNET_STATISTICS_update (GST_stats,
1950 ("# messages not sent (no such peer or not connected)"),
1953 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1954 "Could not send message to peer `%s': unknown neighbour",
1955 GNUNET_i2s (target));
1956 else if (!is_connected (n))
1957 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1958 "Could not send message to peer `%s': not connected\n",
1959 GNUNET_i2s (target));
1961 cont (cont_cls, GNUNET_SYSERR);
1965 if ((n->session == NULL) && (n->address == NULL))
1967 GNUNET_STATISTICS_update (GST_stats,
1969 ("# messages not sent (no such peer or not connected)"),
1971 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1972 "Could not send message to peer `%s': no address available\n",
1973 GNUNET_i2s (target));
1975 cont (cont_cls, GNUNET_SYSERR);
1979 GNUNET_assert (msg_size >= sizeof (struct GNUNET_MessageHeader));
1980 GNUNET_STATISTICS_update (GST_stats,
1982 ("# bytes in message queue for other peers"),
1983 msg_size, GNUNET_NO);
1984 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
1986 mq->cont_cls = cont_cls;
1987 /* FIXME: this memcpy can be up to 7% of our total runtime! */
1988 memcpy (&mq[1], msg, msg_size);
1989 mq->message_buf = (const char *) &mq[1];
1990 mq->message_buf_size = msg_size;
1991 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1992 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
1994 if ((GNUNET_SCHEDULER_NO_TASK == n->transmission_task) &&
1995 (NULL == n->is_active))
1996 n->transmission_task = GNUNET_SCHEDULER_add_now (&transmission_task, n);
2001 * We have received a message from the given sender. How long should
2002 * we delay before receiving more? (Also used to keep the peer marked
2005 * @param sender sender of the message
2006 * @param size size of the message
2007 * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
2008 * GNUNET_NO if the neighbour is not connected or violates the quota,
2009 * GNUNET_SYSERR if the connection is not fully up yet
2010 * @return how long to wait before reading more from this sender
2012 struct GNUNET_TIME_Relative
2013 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
2014 *sender, ssize_t size, int *do_forward)
2016 struct NeighbourMapEntry *n;
2017 struct GNUNET_TIME_Relative ret;
2019 // This can happen during shutdown
2020 if (neighbours == NULL)
2022 return GNUNET_TIME_UNIT_FOREVER_REL;
2025 n = lookup_neighbour (sender);
2028 GST_neighbours_try_connect (sender);
2029 n = lookup_neighbour (sender);
2032 GNUNET_STATISTICS_update (GST_stats,
2034 ("# messages discarded due to lack of neighbour record"),
2036 *do_forward = GNUNET_NO;
2037 return GNUNET_TIME_UNIT_ZERO;
2040 if (!is_connected (n))
2042 *do_forward = GNUNET_SYSERR;
2043 return GNUNET_TIME_UNIT_ZERO;
2045 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
2047 n->quota_violation_count++;
2048 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2049 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
2050 n->in_tracker.available_bytes_per_s__,
2051 n->quota_violation_count);
2052 /* Discount 32k per violation */
2053 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
2057 if (n->quota_violation_count > 0)
2059 /* try to add 32k back */
2060 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
2061 n->quota_violation_count--;
2064 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
2066 GNUNET_STATISTICS_update (GST_stats,
2068 ("# bandwidth quota violations by other peers"),
2070 *do_forward = GNUNET_NO;
2071 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
2073 *do_forward = GNUNET_YES;
2074 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 32 * 1024);
2075 if (ret.rel_value > 0)
2077 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2078 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
2079 (unsigned long long) n->in_tracker.
2080 consumption_since_last_update__,
2081 (unsigned int) n->in_tracker.available_bytes_per_s__,
2082 (unsigned long long) ret.rel_value);
2083 GNUNET_STATISTICS_update (GST_stats,
2084 gettext_noop ("# ms throttling suggested"),
2085 (int64_t) ret.rel_value, GNUNET_NO);
2092 * Keep the connection to the given neighbour alive longer,
2093 * we received a KEEPALIVE (or equivalent).
2095 * @param neighbour neighbour to keep alive
2098 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
2100 struct NeighbourMapEntry *n;
2102 // This can happen during shutdown
2103 if (neighbours == NULL)
2108 n = lookup_neighbour (neighbour);
2111 GNUNET_STATISTICS_update (GST_stats,
2113 ("# KEEPALIVE messages discarded (not connected)"),
2117 GNUNET_SCHEDULER_cancel (n->timeout_task);
2119 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2120 &neighbour_timeout_task, n);
2122 /* send reply to measure latency */
2123 if (S_CONNECTED != n->state)
2126 struct GNUNET_MessageHeader m;
2128 m.size = htons (sizeof (struct GNUNET_MessageHeader));
2129 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE);
2131 send_with_session(n,
2132 (const void *) &m, sizeof (m),
2134 GNUNET_TIME_UNIT_FOREVER_REL,
2139 * We received a KEEP_ALIVE_RESPONSE message and use this to calculate latency
2142 * @param neighbour neighbour to keep alive
2143 * @param ats performance data
2144 * @param ats_count number of entries in ats
2147 GST_neighbours_keepalive_response (const struct GNUNET_PeerIdentity *neighbour,
2148 const struct GNUNET_ATS_Information *ats,
2151 struct NeighbourMapEntry *n;
2152 struct GNUNET_ATS_Information *ats_new;
2155 if (neighbours == NULL)
2157 // This can happen during shutdown
2161 n = lookup_neighbour (neighbour);
2162 if ((NULL == n) || (n->state != S_CONNECTED))
2164 GNUNET_STATISTICS_update (GST_stats,
2166 ("# KEEPALIVE_RESPONSE messages discarded (not connected)"),
2170 if (n->expect_latency_response != GNUNET_YES)
2172 GNUNET_STATISTICS_update (GST_stats,
2174 ("# KEEPALIVE_RESPONSE messages discarded (not expected)"),
2178 n->expect_latency_response = GNUNET_NO;
2180 GNUNET_assert (n->keep_alive_sent.abs_value !=
2181 GNUNET_TIME_absolute_get_zero ().abs_value);
2183 GNUNET_TIME_absolute_get_difference (n->keep_alive_sent,
2184 GNUNET_TIME_absolute_get ());
2185 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Latency for peer `%s' is %llu ms\n",
2186 GNUNET_i2s (&n->id), n->latency.rel_value);
2188 if (n->latency.rel_value == GNUNET_TIME_relative_get_forever ().rel_value)
2190 GNUNET_ATS_address_update (GST_ats, n->address, n->session, ats, ats_count);
2195 GNUNET_malloc (sizeof (struct GNUNET_ATS_Information) *
2197 memcpy (ats_new, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
2200 ats_new[ats_count].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
2201 if (n->latency.rel_value > UINT32_MAX)
2202 latency = UINT32_MAX;
2204 latency = n->latency.rel_value;
2205 ats_new[ats_count].value = htonl (latency);
2207 GNUNET_ATS_address_update (GST_ats, n->address, n->session, ats_new,
2209 GNUNET_free (ats_new);
2215 * Change the incoming quota for the given peer.
2217 * @param neighbour identity of peer to change qutoa for
2218 * @param quota new quota
2221 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
2222 struct GNUNET_BANDWIDTH_Value32NBO quota)
2224 struct NeighbourMapEntry *n;
2226 // This can happen during shutdown
2227 if (neighbours == NULL)
2232 n = lookup_neighbour (neighbour);
2235 GNUNET_STATISTICS_update (GST_stats,
2237 ("# SET QUOTA messages ignored (no such peer)"),
2241 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2242 "Setting inbound quota of %u Bps for peer `%s' to all clients\n",
2243 ntohl (quota.value__), GNUNET_i2s (&n->id));
2244 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
2245 if (0 != ntohl (quota.value__))
2247 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
2248 GNUNET_i2s (&n->id), "SET_QUOTA");
2249 if (is_connected (n))
2250 GNUNET_STATISTICS_update (GST_stats,
2251 gettext_noop ("# disconnects due to quota of 0"),
2253 disconnect_neighbour (n);
2258 * Closure for the neighbours_iterate function.
2260 struct IteratorContext
2263 * Function to call on each connected neighbour.
2265 GST_NeighbourIterator cb;
2275 * Call the callback from the closure for each connected neighbour.
2277 * @param cls the 'struct IteratorContext'
2278 * @param key the hash of the public key of the neighbour
2279 * @param value the 'struct NeighbourMapEntry'
2280 * @return GNUNET_OK (continue to iterate)
2283 neighbours_iterate (void *cls, const GNUNET_HashCode * key, void *value)
2285 struct IteratorContext *ic = cls;
2286 struct NeighbourMapEntry *n = value;
2288 if (!is_connected (n))
2291 ic->cb (ic->cb_cls, &n->id, NULL, 0, n->address);
2297 * Iterate over all connected neighbours.
2299 * @param cb function to call
2300 * @param cb_cls closure for cb
2303 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
2305 struct IteratorContext ic;
2307 // This can happen during shutdown
2308 if (neighbours == NULL)
2315 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
2319 * If we have an active connection to the given target, it must be shutdown.
2321 * @param target peer to disconnect from
2324 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
2326 struct NeighbourMapEntry *n;
2328 // This can happen during shutdown
2329 if (neighbours == NULL)
2334 n = lookup_neighbour (target);
2336 return; /* not active */
2337 disconnect_neighbour (n);
2342 * We received a disconnect message from the given peer,
2343 * validate and process.
2345 * @param peer sender of the message
2346 * @param msg the disconnect message
2349 GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity
2351 const struct GNUNET_MessageHeader
2354 struct NeighbourMapEntry *n;
2355 const struct SessionDisconnectMessage *sdm;
2358 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2359 "Received DISCONNECT message from peer `%s'\n",
2361 if (ntohs (msg->size) != sizeof (struct SessionDisconnectMessage))
2363 // GNUNET_break_op (0);
2364 GNUNET_STATISTICS_update (GST_stats,
2366 ("# disconnect messages ignored (old format)"), 1,
2370 sdm = (const struct SessionDisconnectMessage *) msg;
2371 n = lookup_neighbour (peer);
2373 return; /* gone already */
2374 if (GNUNET_TIME_absolute_ntoh (sdm->timestamp).abs_value <=
2375 n->connect_ts.abs_value)
2377 GNUNET_STATISTICS_update (GST_stats,
2379 ("# disconnect messages ignored (timestamp)"), 1,
2383 GNUNET_CRYPTO_hash (&sdm->public_key,
2384 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2386 if (0 != memcmp (peer, &hc, sizeof (struct GNUNET_PeerIdentity)))
2388 GNUNET_break_op (0);
2391 if (ntohl (sdm->purpose.size) !=
2392 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2393 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
2394 sizeof (struct GNUNET_TIME_AbsoluteNBO))
2396 GNUNET_break_op (0);
2400 GNUNET_CRYPTO_rsa_verify
2401 (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT, &sdm->purpose,
2402 &sdm->signature, &sdm->public_key))
2404 GNUNET_break_op (0);
2407 GST_neighbours_force_disconnect (peer);
2412 * We received a 'SESSION_CONNECT_ACK' message from the other peer.
2413 * Consider switching to it.
2415 * @param message possibly a 'struct SessionConnectMessage' (check format)
2416 * @param peer identity of the peer to switch the address for
2417 * @param address address of the other peer, NULL if other peer
2419 * @param session session to use (or NULL)
2420 * @param ats performance data
2421 * @param ats_count number of entries in ats
2424 GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
2425 const struct GNUNET_PeerIdentity *peer,
2426 const struct GNUNET_HELLO_Address *address,
2427 struct Session *session,
2428 const struct GNUNET_ATS_Information *ats,
2431 const struct SessionConnectMessage *scm;
2432 struct GNUNET_MessageHeader msg;
2433 struct NeighbourMapEntry *n;
2437 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2438 "Received CONNECT_ACK message from peer `%s'\n",
2441 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2443 GNUNET_break_op (0);
2446 scm = (const struct SessionConnectMessage *) message;
2447 GNUNET_break_op (ntohl (scm->reserved) == 0);
2448 n = lookup_neighbour (peer);
2451 /* we did not send 'CONNECT' -- at least not recently */
2452 GNUNET_STATISTICS_update (GST_stats,
2454 ("# unexpected CONNECT_ACK messages (no peer)"),
2461 * ((n->state != S_CONNECT_RECV) && (n->address != NULL)):
2463 * We also received an CONNECT message, switched from SENDT to RECV and
2464 * ATS already suggested us an address after a successful blacklist check
2467 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2468 "Received CONNECT_ACK message from peer `%s' in state `%s'\n",
2470 print_state(n->state));
2472 if ((n->address != NULL) && (n->state == S_CONNECTED))
2474 /* After fast reconnect: send ACK (ACK) even when we are connected */
2475 msg_len = sizeof (msg);
2476 msg.size = htons (msg_len);
2477 msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK);
2479 ret = send_with_session(n,
2480 (const char *) &msg, msg_len,
2481 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
2484 if (ret == GNUNET_SYSERR)
2485 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2486 "Failed to send SESSION_ACK to `%4s' using address '%s' session %X\n",
2487 GNUNET_i2s (&n->id), GST_plugins_a2s (n->address), n->session);
2491 if ((NULL == n->address) ||
2492 ((n->state != S_CONNECT_SENT) &&
2493 ((n->state != S_CONNECT_RECV) && (n->address != NULL))))
2495 GNUNET_STATISTICS_update (GST_stats,
2497 ("# unexpected CONNECT_ACK messages"), 1,
2501 if (n->state != S_CONNECTED)
2502 change_state (n, S_CONNECTED);
2504 if (NULL != session)
2506 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2508 "Giving ATS session %p of plugin %s for peer %s\n",
2509 session, address->transport_name, GNUNET_i2s (peer));
2511 GNUNET_ATS_address_update (GST_ats, address, session, ats, ats_count);
2512 GNUNET_assert (NULL != n->address);
2514 if ((n->address_state == FRESH) && (0 == GNUNET_HELLO_address_cmp(address, n->address)))
2516 GST_validation_set_address_use (n->address, n->session, GNUNET_YES, __LINE__);
2517 GNUNET_ATS_address_in_use (GST_ats, n->address, n->session, GNUNET_YES);
2518 n->address_state = USED;
2521 GST_neighbours_set_incoming_quota (&n->id, n->bandwidth_in);
2523 /* send ACK (ACK) */
2524 msg_len = sizeof (msg);
2525 msg.size = htons (msg_len);
2526 msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK);
2528 ret = send_with_session(n,
2529 (const char *) &msg, msg_len,
2530 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
2533 if (ret == GNUNET_SYSERR)
2534 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2535 "Failed to send SESSION_ACK to `%4s' using address '%s' session %X\n",
2536 GNUNET_i2s (&n->id), GST_plugins_a2s (n->address), n->session);
2539 if (n->keepalive_task == GNUNET_SCHEDULER_NO_TASK)
2540 n->keepalive_task = GNUNET_SCHEDULER_add_now (&neighbour_keepalive_task, n);
2542 neighbours_connected++;
2543 GNUNET_STATISTICS_set (GST_stats, gettext_noop ("# peers connected"), neighbours_connected,
2545 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2546 "Notify about connect of `%4s' using address '%s' session %X LINE %u\n",
2547 GNUNET_i2s (&n->id), GST_plugins_a2s (n->address), n->session,
2549 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2550 send_outbound_quota (peer, n->bandwidth_out);
2556 GST_neighbours_handle_ack (const struct GNUNET_MessageHeader *message,
2557 const struct GNUNET_PeerIdentity *peer,
2558 const struct GNUNET_HELLO_Address *address,
2559 struct Session *session,
2560 const struct GNUNET_ATS_Information *ats,
2563 struct NeighbourMapEntry *n;
2565 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received ACK message from peer `%s'\n",
2567 if (ntohs (message->size) != sizeof (struct GNUNET_MessageHeader))
2569 GNUNET_break_op (0);
2572 n = lookup_neighbour (peer);
2578 if (S_CONNECTED == n->state)
2580 if (!is_connecting (n))
2582 GNUNET_STATISTICS_update (GST_stats,
2583 gettext_noop ("# unexpected ACK messages"), 1,
2587 change_state (n, S_CONNECTED);
2588 if (NULL != session)
2589 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2591 "Giving ATS session %p of plugin %s for peer %s\n",
2592 session, address->transport_name, GNUNET_i2s (peer));
2593 GNUNET_ATS_address_update (GST_ats, address, session, ats, ats_count);
2594 GNUNET_assert (n->address != NULL);
2596 if ((n->address_state == FRESH) && (0 == GNUNET_HELLO_address_cmp(address, n->address)))
2598 GST_validation_set_address_use (n->address, n->session, GNUNET_YES, __LINE__);
2599 GNUNET_ATS_address_in_use (GST_ats, n->address, n->session, GNUNET_YES);
2600 n->address_state = USED;
2604 neighbours_connected++;
2605 GNUNET_STATISTICS_set (GST_stats, gettext_noop ("# peers connected"), neighbours_connected,
2608 GST_neighbours_set_incoming_quota (&n->id, n->bandwidth_in);
2609 if (n->keepalive_task == GNUNET_SCHEDULER_NO_TASK)
2610 n->keepalive_task = GNUNET_SCHEDULER_add_now (&neighbour_keepalive_task, n);
2611 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2612 "Notify about connect of `%4s' using address '%s' session %X LINE %u\n",
2613 GNUNET_i2s (&n->id), GST_plugins_a2s (n->address), n->session,
2615 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2616 send_outbound_quota (peer, n->bandwidth_out);
2619 struct BlackListCheckContext
2621 struct GNUNET_ATS_Information *ats;
2625 struct Session *session;
2627 struct GNUNET_HELLO_Address *address;
2629 struct GNUNET_TIME_Absolute ts;
2634 handle_connect_blacklist_cont (void *cls,
2635 const struct GNUNET_PeerIdentity *peer,
2638 struct NeighbourMapEntry *n;
2639 struct BlackListCheckContext *bcc = cls;
2641 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2642 "Blacklist check due to CONNECT message: `%s'\n",
2644 (result == GNUNET_OK) ? "ALLOWED" : "FORBIDDEN");
2646 if (GNUNET_OK != result)
2648 GNUNET_HELLO_address_free (bcc->address);
2653 n = lookup_neighbour (peer);
2655 n = setup_neighbour (peer);
2657 if (bcc->ts.abs_value > n->connect_ts.abs_value)
2659 if (NULL != bcc->session)
2660 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2662 "Giving ATS session %p of address `%s' for peer %s\n",
2663 bcc->session, GST_plugins_a2s (bcc->address),
2665 /* Tell ATS about the session, so ATS can suggest it if it likes it. */
2667 GNUNET_ATS_address_update (GST_ats, bcc->address, bcc->session, bcc->ats,
2669 n->connect_ts = bcc->ts;
2672 GNUNET_HELLO_address_free (bcc->address);
2675 if (n->state != S_CONNECT_RECV)
2676 change_state (n, S_CONNECT_RECV);
2679 /* Ask ATS for an address to connect via that address */
2680 if (n->ats_suggest != GNUNET_SCHEDULER_NO_TASK)
2681 GNUNET_SCHEDULER_cancel (n->ats_suggest);
2683 GNUNET_SCHEDULER_add_delayed (ATS_RESPONSE_TIMEOUT, ats_suggest_cancel,
2685 GNUNET_ATS_suggest_address (GST_ats, peer);
2689 * We received a 'SESSION_CONNECT' message from the other peer.
2690 * Consider switching to it.
2692 * @param message possibly a 'struct SessionConnectMessage' (check format)
2693 * @param peer identity of the peer to switch the address for
2694 * @param address address of the other peer, NULL if other peer
2696 * @param session session to use (or NULL)
2697 * @param ats performance data
2698 * @param ats_count number of entries in ats (excluding 0-termination)
2701 GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
2702 const struct GNUNET_PeerIdentity *peer,
2703 const struct GNUNET_HELLO_Address *address,
2704 struct Session *session,
2705 const struct GNUNET_ATS_Information *ats,
2708 const struct SessionConnectMessage *scm;
2709 struct BlackListCheckContext *bcc = NULL;
2710 struct NeighbourMapEntry *n;
2712 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2713 "Received CONNECT message from peer `%s'\n", GNUNET_i2s (peer));
2714 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2716 GNUNET_break_op (0);
2720 scm = (const struct SessionConnectMessage *) message;
2721 GNUNET_break_op (ntohl (scm->reserved) == 0);
2723 GNUNET_ATS_address_update (GST_ats, address, session, ats, ats_count);
2725 n = lookup_neighbour (peer);
2726 if ((n != NULL) && ((S_CONNECTED == n->state) || (S_FAST_RECONNECT == n->state)))
2728 /* connected peer switches addresses or is trying to do a fast reconnect*/
2733 /* we are not connected to this peer */
2734 /* do blacklist check */
2736 GNUNET_malloc (sizeof (struct BlackListCheckContext) +
2737 sizeof (struct GNUNET_ATS_Information) * (ats_count + 1));
2738 bcc->ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2739 bcc->ats_count = ats_count + 1;
2740 bcc->address = GNUNET_HELLO_address_copy (address);
2741 bcc->session = session;
2742 bcc->ats = (struct GNUNET_ATS_Information *) &bcc[1];
2743 memcpy (bcc->ats, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
2744 bcc->ats[ats_count].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
2745 bcc->ats[ats_count].value =
2746 htonl ((uint32_t) GST_neighbour_get_latency (peer).rel_value);
2747 GST_blacklist_test_allowed (peer, address->transport_name,
2748 &handle_connect_blacklist_cont, bcc);
2752 /* end of file gnunet-service-transport_neighbours.c */