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3 (C) 2010,2011,2012 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 * - "address_change_cb" is NEVER invoked; when should we call this one exactly?
28 * - TEST, TEST, TEST...
31 #include "gnunet_ats_service.h"
32 #include "gnunet-service-transport_neighbours.h"
33 #include "gnunet-service-transport_plugins.h"
34 #include "gnunet-service-transport_validation.h"
35 #include "gnunet-service-transport_clients.h"
36 #include "gnunet-service-transport.h"
37 #include "gnunet_peerinfo_service.h"
38 #include "gnunet-service-transport_blacklist.h"
39 #include "gnunet_constants.h"
40 #include "transport.h"
45 * Size of the neighbour hash map.
47 #define NEIGHBOUR_TABLE_SIZE 256
50 * Time we give plugin to transmit DISCONNECT message before the
51 * neighbour entry self-destructs.
53 #define DISCONNECT_SENT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 100)
56 * How often must a peer violate bandwidth quotas before we start
57 * to simply drop its messages?
59 #define QUOTA_VIOLATION_DROP_THRESHOLD 10
62 * How often do we send KEEPALIVE messages to each of our neighbours and measure
63 * the latency with this neighbour?
64 * (idle timeout is 5 minutes or 300 seconds, so with 100s interval we
65 * send 3 keepalives in each interval, so 3 messages would need to be
66 * lost in a row for a disconnect).
68 #define KEEPALIVE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 100)
71 * How long are we willing to wait for a response from ATS before timing out?
73 #define ATS_RESPONSE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 500)
76 * How long are we willing to wait for an ACK from the other peer before
77 * giving up on our connect operation?
79 #define SETUP_CONNECTION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
82 * How long are we willing to wait for a successful reconnect if
83 * an existing connection went down? Much shorter than the
84 * usual SETUP_CONNECTION_TIMEOUT as we do not inform the
85 * higher layers about the disconnect during this period.
87 #define FAST_RECONNECT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
90 * How long are we willing to wait for a response from the blacklist
91 * subsystem before timing out?
93 #define BLACKLIST_RESPONSE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 500)
96 GNUNET_NETWORK_STRUCT_BEGIN
99 * Message a peer sends to another to indicate that it intends to
100 * setup a connection/session for data exchange. A 'SESSION_CONNECT'
101 * should be answered with a 'SESSION_CONNECT_ACK' with the same body
102 * to confirm. A 'SESSION_CONNECT_ACK' should then be followed with
103 * a 'SESSION_ACK'. Once the 'SESSION_ACK' is received, both peers
104 * should be connected.
106 struct SessionConnectMessage
109 * Header of type 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT'
110 * or 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK'
112 struct GNUNET_MessageHeader header;
117 uint32_t reserved GNUNET_PACKED;
120 * Absolute time at the sender. Only the most recent connect
121 * message implies which session is preferred by the sender.
123 struct GNUNET_TIME_AbsoluteNBO timestamp;
129 * Message we send to the other peer to notify him that we intentionally
130 * are disconnecting (to reduce timeouts). This is just a friendly
131 * notification, peers must not rely on always receiving disconnect
134 struct SessionDisconnectMessage
137 * Header of type 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT'
139 struct GNUNET_MessageHeader header;
144 uint32_t reserved GNUNET_PACKED;
147 * Purpose of the signature. Extends over the timestamp.
148 * Purpose should be GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DISCONNECT.
150 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
153 * Absolute time at the sender. Only the most recent connect
154 * message implies which session is preferred by the sender.
156 struct GNUNET_TIME_AbsoluteNBO timestamp;
159 * Public key of the sender.
161 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
164 * Signature of the peer that sends us the disconnect. Only
165 * valid if the timestamp is AFTER the timestamp from the
166 * corresponding 'CONNECT' message.
168 struct GNUNET_CRYPTO_RsaSignature signature;
172 GNUNET_NETWORK_STRUCT_END
176 * For each neighbour we keep a list of messages
177 * that we still want to transmit to the neighbour.
183 * This is a doubly linked list.
185 struct MessageQueue *next;
188 * This is a doubly linked list.
190 struct MessageQueue *prev;
193 * Function to call once we're done.
195 GST_NeighbourSendContinuation cont;
203 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
204 * stuck together in memory. Allocated at the end of this struct.
206 const char *message_buf;
209 * Size of the message buf
211 size_t message_buf_size;
214 * At what time should we fail?
216 struct GNUNET_TIME_Absolute timeout;
222 * Possible state of a neighbour. Initially, we are S_NOT_CONNECTED.
224 * Then, there are two main paths. If we receive a CONNECT message, we
225 * first run a check against the blacklist (S_CONNECT_RECV_BLACKLIST_INBOUND).
226 * If this check is successful, we give the inbound address to ATS.
227 * After the check we ask ATS for a suggestion (S_CONNECT_RECV_ATS).
228 * If ATS makes a suggestion, we ALSO give that suggestion to the blacklist
229 * (S_CONNECT_RECV_BLACKLIST). Once the blacklist approves the
230 * address we got from ATS, we send our CONNECT_ACK and go to
231 * S_CONNECT_RECV_ACK. If we receive a SESSION_ACK, we go to
232 * S_CONNECTED (and notify everyone about the new connection). If the
233 * operation times out, we go to S_DISCONNECT.
235 * The other case is where we transmit a CONNECT message first. We
236 * start with S_INIT_ATS. If we get an address, we enter
237 * S_INIT_BLACKLIST and check the blacklist. If the blacklist is OK
238 * with the connection, we actually send the CONNECT message and go to
239 * state S_CONNECT_SENT. Once we receive a CONNECT_ACK, we go to
240 * S_CONNECTED (and notify everyone about the new connection and send
241 * back a SESSION_ACK). If the operation times out, we go to
244 * If the session is in trouble (i.e. transport-level disconnect or
245 * timeout), we go to S_RECONNECT_ATS where we ask ATS for a new
246 * address (we don't notify anyone about the disconnect yet). Once we
247 * have a new address, we go to S_RECONNECT_BLACKLIST to check the new
248 * address against the blacklist. If the blacklist approves, we enter
249 * S_RECONNECT_SENT and send a CONNECT message. If we receive a
250 * CONNECT_ACK, we go to S_CONNECTED and nobody noticed that we had
251 * trouble; we also send a SESSION_ACK at this time just in case. If
252 * the operation times out, we go to S_DISCONNECT (and notify everyone
253 * about the lost connection).
255 * If ATS decides to switch addresses while we have a normal
256 * connection, we go to S_CONNECTED_SWITCHING_BLACKLIST to check the
257 * new address against the blacklist. If the blacklist approves, we
258 * go to S_CONNECTED_SWITCHING_CONNECT_SENT and send a
259 * SESSION_CONNECT. If we get a SESSION_ACK back, we switch the
260 * primary connection to the suggested alternative from ATS, go back
261 * to S_CONNECTED and send a SESSION_ACK to the other peer just to be
262 * sure. If the operation times out (or the blacklist disapproves),
263 * we go to S_CONNECTED (and notify ATS that the given alternative
264 * address is "invalid").
266 * Once a session is in S_DISCONNECT, it is cleaned up and then goes
267 * to (S_DISCONNECT_FINISHED). If we receive an explicit disconnect
268 * request, we can go from any state to S_DISCONNECT, possibly after
269 * generating disconnect notifications.
271 * Note that it is quite possible that while we are in any of these
272 * states, we could receive a 'CONNECT' request from the other peer.
273 * We then enter a 'weird' state where we pursue our own primary state
274 * machine (as described above), but with the 'send_connect_ack' flag
275 * set to 1. If our state machine allows us to send a 'CONNECT_ACK'
276 * (because we have an acceptable address), we send the 'CONNECT_ACK'
277 * and set the 'send_connect_ack' to 2. If we then receive a
278 * 'SESSION_ACK', we go to 'S_CONNECTED' (and reset 'send_connect_ack'
285 * fresh peer or completely disconnected
290 * Asked to initiate connection, trying to get address from ATS
295 * Asked to initiate connection, trying to get address approved
301 * Sent CONNECT message to other peer, waiting for CONNECT_ACK
306 * Received a CONNECT, do a blacklist check for inbound address
308 S_CONNECT_RECV_BLACKLIST_INBOUND,
311 * Received a CONNECT, asking ATS about address suggestions.
316 * Received CONNECT from other peer, got an address, checking with blacklist.
318 S_CONNECT_RECV_BLACKLIST,
321 * CONNECT request from other peer was SESSION_ACK'ed, waiting for
327 * Got our CONNECT_ACK/SESSION_ACK, connection is up.
332 * Connection got into trouble, rest of the system still believes
333 * it to be up, but we're getting a new address from ATS.
338 * Connection got into trouble, rest of the system still believes
339 * it to be up; we are checking the new address against the blacklist.
341 S_RECONNECT_BLACKLIST,
344 * Sent CONNECT over new address (either by ATS telling us to switch
345 * addresses or from RECONNECT_ATS); if this fails, we need to tell
346 * the rest of the system about a disconnect.
351 * We have some primary connection, but ATS suggested we switch
352 * to some alternative; we're now checking the alternative against
355 S_CONNECTED_SWITCHING_BLACKLIST,
358 * We have some primary connection, but ATS suggested we switch
359 * to some alternative; we now sent a CONNECT message for the
360 * alternative session to the other peer and waiting for a
361 * CONNECT_ACK to make this our primary connection.
363 S_CONNECTED_SWITCHING_CONNECT_SENT,
366 * Disconnect in progress (we're sending the DISCONNECT message to the
367 * other peer; after that is finished, the state will be cleaned up).
372 * We're finished with the disconnect; and are cleaning up the state
373 * now! We put the struct into this state when we are really in the
374 * task that calls 'free' on it and are about to remove the record
375 * from the map. We should never find a 'struct NeighbourMapEntry'
376 * in this state in the map. Accessing a 'struct NeighbourMapEntry'
377 * in this state virtually always means using memory that has been
378 * freed (the exception being the cleanup code in 'free_neighbour').
380 S_DISCONNECT_FINISHED
385 * A possible address we could use to communicate with a neighbour.
387 struct NeighbourAddress
391 * Active session for this address.
393 struct Session *session;
396 * Network-level address information.
398 struct GNUNET_HELLO_Address *address;
401 * Timestamp of the 'SESSION_CONNECT' message we sent to the other
402 * peer for this address. Use to check that the ACK is in response
403 * to our most recent 'CONNECT'.
405 struct GNUNET_TIME_Absolute connect_timestamp;
408 * Inbound bandwidth from ATS for this address.
410 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in;
413 * Outbound bandwidth from ATS for this address.
415 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out;
418 * Did we tell ATS that this is our 'active' address?
426 * Entry in neighbours.
428 struct NeighbourMapEntry
432 * Head of list of messages we would like to send to this peer;
433 * must contain at most one message per client.
435 struct MessageQueue *messages_head;
438 * Tail of list of messages we would like to send to this peer; must
439 * contain at most one message per client.
441 struct MessageQueue *messages_tail;
444 * Are we currently trying to send a message? If so, which one?
446 struct MessageQueue *is_active;
449 * Primary address we currently use to communicate with the neighbour.
451 struct NeighbourAddress primary_address;
454 * Alternative address currently under consideration for communicating
455 * with the neighbour.
457 struct NeighbourAddress alternative_address;
460 * Identity of this neighbour.
462 struct GNUNET_PeerIdentity id;
465 * Main task that drives this peer (timeouts, keepalives, etc.).
466 * Always runs the 'master_task'.
468 GNUNET_SCHEDULER_TaskIdentifier task;
471 * At what time should we sent the next keep-alive message?
473 struct GNUNET_TIME_Absolute keep_alive_time;
476 * At what time did we sent the last keep-alive message? Used
477 * to calculate round-trip time ("latency").
479 struct GNUNET_TIME_Absolute last_keep_alive_time;
482 * Timestamp we should include in our next CONNECT_ACK message.
483 * (only valid if 'send_connect_ack' is GNUNET_YES). Used to build
484 * our CONNECT_ACK message.
486 struct GNUNET_TIME_Absolute connect_ack_timestamp;
489 * Time where we should cut the connection (timeout) if we don't
490 * make progress in the state machine (or get a KEEPALIVE_RESPONSE
491 * if we are in S_CONNECTED).
493 struct GNUNET_TIME_Absolute timeout;
496 * Latest calculated latency value
498 struct GNUNET_TIME_Relative latency;
501 * Tracker for inbound bandwidth.
503 struct GNUNET_BANDWIDTH_Tracker in_tracker;
506 * How often has the other peer (recently) violated the inbound
507 * traffic limit? Incremented by 10 per violation, decremented by 1
508 * per non-violation (for each time interval).
510 unsigned int quota_violation_count;
513 * The current state of the peer.
518 * Did we sent an KEEP_ALIVE message and are we expecting a response?
520 int expect_latency_response;
523 * Flag to set if we still need to send a CONNECT_ACK message to the other peer
524 * (once we have an address to use and the peer has been allowed by our
525 * blacklist). Set to 1 if we need to send a CONNECT_ACK. Set to 2 if we
526 * did send a CONNECT_ACK and should go to 'S_CONNECTED' upon receiving
527 * a 'SESSION_ACK' (regardless of what our own state machine might say).
529 int send_connect_ack;
535 * Context for blacklist checks and the 'handle_test_blacklist_cont'
536 * function. Stores information about ongoing blacklist checks.
538 struct BlackListCheckContext
542 * We keep blacklist checks in a DLL.
544 struct BlackListCheckContext *next;
547 * We keep blacklist checks in a DLL.
549 struct BlackListCheckContext *prev;
552 * Address that is being checked.
554 struct NeighbourAddress na;
557 * ATS information about the address.
559 struct GNUNET_ATS_Information *ats;
562 * Handle to the ongoing blacklist check.
564 struct GST_BlacklistCheck *bc;
567 * Size of the 'ats' array.
575 * Hash map from peer identities to the respective 'struct NeighbourMapEntry'.
577 static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
580 * We keep blacklist checks in a DLL so that we can find
581 * the 'sessions' in their 'struct NeighbourAddress' if
582 * a session goes down.
584 static struct BlackListCheckContext *bc_head;
587 * We keep blacklist checks in a DLL.
589 static struct BlackListCheckContext *bc_tail;
592 * Closure for connect_notify_cb, disconnect_notify_cb and address_change_cb
594 static void *callback_cls;
597 * Function to call when we connected to a neighbour.
599 static NotifyConnect connect_notify_cb;
602 * Function to call when we disconnected from a neighbour.
604 static GNUNET_TRANSPORT_NotifyDisconnect disconnect_notify_cb;
607 * Function to call when we changed an active address of a neighbour.
609 static GNUNET_TRANSPORT_PeerIterateCallback address_change_cb;
612 * counter for connected neighbours
614 static unsigned int neighbours_connected;
617 * Number of bytes we have currently queued for transmission.
619 static unsigned long long bytes_in_send_queue;
623 * Lookup a neighbour entry in the neighbours hash map.
625 * @param pid identity of the peer to look up
626 * @return the entry, NULL if there is no existing record
628 static struct NeighbourMapEntry *
629 lookup_neighbour (const struct GNUNET_PeerIdentity *pid)
631 if (NULL == neighbours)
633 return GNUNET_CONTAINER_multihashmap_get (neighbours, &pid->hashPubKey);
637 print_state (int state)
642 case S_NOT_CONNECTED:
643 return "S_NOT_CONNECTED";
646 case S_INIT_BLACKLIST:
647 return "S_INIT_BLACKLIST";
649 return "S_CONNECT_SENT";
650 case S_CONNECT_RECV_BLACKLIST_INBOUND:
651 return "S_CONNECT_RECV_BLACKLIST_INBOUND";
652 case S_CONNECT_RECV_ATS:
653 return "S_CONNECT_RECV_ATS";
654 case S_CONNECT_RECV_BLACKLIST:
655 return "S_CONNECT_RECV_BLACKLIST";
656 case S_CONNECT_RECV_ACK:
657 return "S_CONNECT_RECV_ACK";
659 return "S_CONNECTED";
660 case S_RECONNECT_ATS:
661 return "S_RECONNECT_ATS";
662 case S_RECONNECT_BLACKLIST:
663 return "S_RECONNECT_BLACKLIST";
664 case S_RECONNECT_SENT:
665 return "S_RECONNECT_SENT";
666 case S_CONNECTED_SWITCHING_BLACKLIST:
667 return "S_CONNECTED_SWITCHING_BLACKLIST";
668 case S_CONNECTED_SWITCHING_CONNECT_SENT:
669 return "S_CONNECTED_SWITCHING_CONNECT_SENT";
671 return "S_DISCONNECT";
672 case S_DISCONNECT_FINISHED:
673 return "S_DISCONNECT_FINISHED";
682 * Test if we're connected to the given peer.
684 * @param n neighbour entry of peer to test
685 * @return GNUNET_YES if we are connected, GNUNET_NO if not
688 test_connected (struct NeighbourMapEntry *n)
694 case S_NOT_CONNECTED:
696 case S_INIT_BLACKLIST:
698 case S_CONNECT_RECV_BLACKLIST_INBOUND:
699 case S_CONNECT_RECV_ATS:
700 case S_CONNECT_RECV_BLACKLIST:
701 case S_CONNECT_RECV_ACK:
704 case S_RECONNECT_ATS:
705 case S_RECONNECT_BLACKLIST:
706 case S_RECONNECT_SENT:
707 case S_CONNECTED_SWITCHING_BLACKLIST:
708 case S_CONNECTED_SWITCHING_CONNECT_SENT:
711 case S_DISCONNECT_FINISHED:
714 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
718 return GNUNET_SYSERR;
722 * Send information about a new outbound quota to our clients.
724 * @param target affected peer
725 * @param quota new quota
728 send_outbound_quota (const struct GNUNET_PeerIdentity *target,
729 struct GNUNET_BANDWIDTH_Value32NBO quota)
731 struct QuotaSetMessage q_msg;
733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
734 "Sending outbound quota of %u Bps for peer `%s' to all clients\n",
735 ntohl (quota.value__), GNUNET_i2s (target));
736 q_msg.header.size = htons (sizeof (struct QuotaSetMessage));
737 q_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
739 q_msg.peer = (*target);
740 GST_clients_broadcast (&q_msg.header, GNUNET_NO);
745 * We don't need a given neighbour address any more.
746 * Release its resources and give appropriate notifications
747 * to ATS and other subsystems.
749 * @param na address we are done with; 'na' itself must NOT be 'free'd, only the contents!
752 free_address (struct NeighbourAddress *na)
754 if (GNUNET_YES == na->ats_active)
756 GST_validation_set_address_use (na->address, na->session, GNUNET_NO, __LINE__);
757 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, GNUNET_NO);
760 na->ats_active = GNUNET_NO;
761 if (NULL != na->address)
763 GNUNET_HELLO_address_free (na->address);
771 * Initialize the 'struct NeighbourAddress'.
773 * @param na neighbour address to initialize
774 * @param address address of the other peer, NULL if other peer
776 * @param session session to use (or NULL, in which case an
777 * address must be setup)
778 * @param bandwidth_in inbound quota to be used when connection is up
779 * @param bandwidth_out outbound quota to be used when connection is up
780 * @param is_active GNUNET_YES to mark this as the active address with ATS
783 set_address (struct NeighbourAddress *na,
784 const struct GNUNET_HELLO_Address *address,
785 struct Session *session,
786 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
787 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
790 struct GNUNET_TRANSPORT_PluginFunctions *papi;
792 if (NULL == (papi = GST_plugins_find (address->transport_name)))
797 if (session == na->session)
799 na->bandwidth_in = bandwidth_in;
800 na->bandwidth_out = bandwidth_out;
801 if (is_active != na->ats_active)
803 na->ats_active = is_active;
804 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, is_active);
805 GST_validation_set_address_use (na->address, na->session, is_active, __LINE__);
807 if (GNUNET_YES == is_active)
809 /* FIXME: is this the right place to set quotas? */
810 GST_neighbours_set_incoming_quota (&address->peer, bandwidth_in);
811 send_outbound_quota (&address->peer, bandwidth_out);
817 session = papi->get_session (papi->cls, address);
820 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
821 "Failed to obtain new session for peer `%s' and address '%s'\n",
822 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
823 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
826 na->address = GNUNET_HELLO_address_copy (address);
827 na->bandwidth_in = bandwidth_in;
828 na->bandwidth_out = bandwidth_out;
829 na->session = session;
830 na->ats_active = is_active;
831 if (GNUNET_YES == is_active)
833 /* Telling ATS about new session */
834 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, GNUNET_YES);
835 GST_validation_set_address_use (na->address, na->session, GNUNET_YES, __LINE__);
837 /* FIXME: is this the right place to set quotas? */
838 GST_neighbours_set_incoming_quota (&address->peer, bandwidth_in);
839 send_outbound_quota (&address->peer, bandwidth_out);
845 * Free a neighbour map entry.
847 * @param n entry to free
848 * @param keep_sessions GNUNET_NO to tell plugin to terminate sessions,
849 * GNUNET_YES to keep all sessions
852 free_neighbour (struct NeighbourMapEntry *n, int keep_sessions)
854 struct MessageQueue *mq;
855 struct GNUNET_TRANSPORT_PluginFunctions *papi;
856 struct GNUNET_HELLO_Address *backup_primary;
858 n->is_active = NULL; /* always free'd by its own continuation! */
860 /* fail messages currently in the queue */
861 while (NULL != (mq = n->messages_head))
863 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
864 if (NULL != mq->cont)
865 mq->cont (mq->cont_cls, GNUNET_SYSERR, mq->message_buf_size, 0);
868 /* It is too late to send other peer disconnect notifications, but at
869 least internally we need to get clean... */
870 if (GNUNET_YES == test_connected (n))
872 GNUNET_STATISTICS_set (GST_stats,
873 gettext_noop ("# peers connected"),
874 --neighbours_connected,
876 disconnect_notify_cb (callback_cls, &n->id);
879 n->state = S_DISCONNECT_FINISHED;
881 if (NULL != n->primary_address.address)
882 backup_primary = GNUNET_HELLO_address_copy(n->primary_address.address);
884 backup_primary = NULL;
886 /* free addresses and mark as unused */
887 free_address (&n->primary_address);
888 free_address (&n->alternative_address);
890 /* FIXME-PLUGIN-API: This does not seem to guarantee that all
891 transport sessions eventually get killed due to inactivity; they
892 MUST have their own timeout logic (but at least TCP doesn't have
893 one yet). Are we sure that EVERY 'session' of a plugin is
894 actually cleaned up this way!? Note that if we are switching
895 between two TCP sessions to the same peer, the existing plugin
896 API gives us not even the means to selectively kill only one of
897 them! Killing all sessions like this seems to be very, very
900 /* cut transport-level connection */
901 if ((GNUNET_NO == keep_sessions) &&
902 (NULL != backup_primary) &&
903 (NULL != (papi = GST_plugins_find (backup_primary->transport_name))))
904 papi->disconnect (papi->cls, &n->id);
906 GNUNET_free_non_null (backup_primary);
908 GNUNET_assert (GNUNET_YES ==
909 GNUNET_CONTAINER_multihashmap_remove (neighbours,
910 &n->id.hashPubKey, n));
912 // FIXME-ATS-API: we might want to be more specific about
913 // which states we do this from in the future (ATS should
914 // have given us a 'suggest_address' handle, and if we have
915 // such a handle, we should cancel the operation here!
916 GNUNET_ATS_suggest_address_cancel (GST_ats, &n->id);
918 if (GNUNET_SCHEDULER_NO_TASK != n->task)
920 GNUNET_SCHEDULER_cancel (n->task);
921 n->task = GNUNET_SCHEDULER_NO_TASK;
923 /* free rest of memory */
928 * Transmit a message using the current session of the given
931 * @param n entry for the recipient
932 * @param msgbuf buffer to transmit
933 * @param msgbuf_size number of bytes in buffer
934 * @param priority transmission priority
935 * @param timeout transmission timeout
936 * @param cont continuation to call when finished (can be NULL)
937 * @param cont_cls closure for cont
940 send_with_session (struct NeighbourMapEntry *n,
941 const char *msgbuf, size_t msgbuf_size,
943 struct GNUNET_TIME_Relative timeout,
944 GNUNET_TRANSPORT_TransmitContinuation cont,
947 struct GNUNET_TRANSPORT_PluginFunctions *papi;
949 GNUNET_assert (n->primary_address.session != NULL);
950 if ( ((NULL == (papi = GST_plugins_find (n->primary_address.address->transport_name)) ||
951 (-1 == papi->send (papi->cls,
952 n->primary_address.session,
956 cont, cont_cls)))) &&
958 cont (cont_cls, &n->id, GNUNET_SYSERR, msgbuf_size, 0);
959 GNUNET_break (NULL != papi);
964 * Master task run for every neighbour. Performs all of the time-related
965 * activities (keep alive, send next message, disconnect if idle, finish
966 * clean up after disconnect).
968 * @param cls the 'struct NeighbourMapEntry' for which we are running
969 * @param tc scheduler context (unused)
972 master_task (void *cls,
973 const struct GNUNET_SCHEDULER_TaskContext *tc);
977 * Function called when the 'DISCONNECT' message has been sent by the
978 * plugin. Frees the neighbour --- if the entry still exists.
981 * @param target identity of the neighbour that was disconnected
982 * @param result GNUNET_OK if the disconnect got out successfully
985 send_disconnect_cont (void *cls, const struct GNUNET_PeerIdentity *target,
986 int result, size_t payload, size_t physical)
988 struct NeighbourMapEntry *n;
990 n = lookup_neighbour (target);
992 return; /* already gone */
993 if (S_DISCONNECT != n->state)
994 return; /* have created a fresh entry since */
995 n->state = S_DISCONNECT;
996 if (GNUNET_SCHEDULER_NO_TASK != n->task)
997 GNUNET_SCHEDULER_cancel (n->task);
998 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1003 * Transmit a DISCONNECT message to the other peer.
1005 * @param n neighbour to send DISCONNECT message.
1008 send_disconnect (struct NeighbourMapEntry *n)
1010 struct SessionDisconnectMessage disconnect_msg;
1012 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1013 "Sending DISCONNECT message to peer `%4s'\n",
1014 GNUNET_i2s (&n->id));
1015 disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
1016 disconnect_msg.header.type =
1017 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1018 disconnect_msg.reserved = htonl (0);
1019 disconnect_msg.purpose.size =
1020 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1021 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
1022 sizeof (struct GNUNET_TIME_AbsoluteNBO));
1023 disconnect_msg.purpose.purpose =
1024 htonl (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1025 disconnect_msg.timestamp =
1026 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1027 disconnect_msg.public_key = GST_my_public_key;
1028 GNUNET_assert (GNUNET_OK ==
1029 GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
1030 &disconnect_msg.purpose,
1031 &disconnect_msg.signature));
1033 send_with_session (n,
1034 (const char *) &disconnect_msg, sizeof (disconnect_msg),
1035 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
1036 &send_disconnect_cont, NULL);
1037 GNUNET_STATISTICS_update (GST_stats,
1039 ("# DISCONNECT messages sent"), 1,
1045 * Disconnect from the given neighbour, clean up the record.
1047 * @param n neighbour to disconnect from
1050 disconnect_neighbour (struct NeighbourMapEntry *n)
1052 /* depending on state, notify neighbour and/or upper layers of this peer
1056 case S_NOT_CONNECTED:
1058 case S_INIT_BLACKLIST:
1059 /* other peer is completely unaware of us, no need to send DISCONNECT */
1060 n->state = S_DISCONNECT_FINISHED;
1061 free_neighbour (n, GNUNET_NO);
1063 case S_CONNECT_SENT:
1064 send_disconnect (n);
1065 n->state = S_DISCONNECT;
1067 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1068 case S_CONNECT_RECV_ATS:
1069 case S_CONNECT_RECV_BLACKLIST:
1070 /* we never ACK'ed the other peer's request, no need to send DISCONNECT */
1071 n->state = S_DISCONNECT_FINISHED;
1072 free_neighbour (n, GNUNET_NO);
1074 case S_CONNECT_RECV_ACK:
1075 /* we DID ACK the other peer's request, must send DISCONNECT */
1076 send_disconnect (n);
1077 n->state = S_DISCONNECT;
1080 case S_RECONNECT_BLACKLIST:
1081 case S_RECONNECT_SENT:
1082 case S_CONNECTED_SWITCHING_BLACKLIST:
1083 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1084 /* we are currently connected, need to send disconnect and do
1085 internal notifications and update statistics */
1086 send_disconnect (n);
1087 GNUNET_STATISTICS_set (GST_stats,
1088 gettext_noop ("# peers connected"),
1089 --neighbours_connected,
1091 disconnect_notify_cb (callback_cls, &n->id);
1092 n->state = S_DISCONNECT;
1094 case S_RECONNECT_ATS:
1095 /* ATS address request timeout, disconnect without sending disconnect message */
1096 GNUNET_STATISTICS_set (GST_stats,
1097 gettext_noop ("# peers connected"),
1098 --neighbours_connected,
1100 disconnect_notify_cb (callback_cls, &n->id);
1101 n->state = S_DISCONNECT;
1104 /* already disconnected, ignore */
1106 case S_DISCONNECT_FINISHED:
1107 /* already cleaned up, how did we get here!? */
1111 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1115 /* schedule timeout to clean up */
1116 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1117 GNUNET_SCHEDULER_cancel (n->task);
1118 n->task = GNUNET_SCHEDULER_add_delayed (DISCONNECT_SENT_TIMEOUT,
1124 * We're done with our transmission attempt, continue processing.
1126 * @param cls the 'struct MessageQueue' of the message
1127 * @param receiver intended receiver
1128 * @param success whether it worked or not
1131 transmit_send_continuation (void *cls,
1132 const struct GNUNET_PeerIdentity *receiver,
1133 int success, size_t size_payload, size_t physical)
1135 struct MessageQueue *mq = cls;
1136 struct NeighbourMapEntry *n;
1138 if (NULL == (n = lookup_neighbour (receiver)))
1141 return; /* disconnect or other error while transmitting, can happen */
1143 if (n->is_active == mq)
1145 /* this is still "our" neighbour, remove us from its queue
1146 and allow it to send the next message now */
1147 n->is_active = NULL;
1148 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1149 GNUNET_SCHEDULER_cancel (n->task);
1150 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1152 GNUNET_assert (bytes_in_send_queue >= mq->message_buf_size);
1153 GNUNET_break (size_payload == mq->message_buf_size);
1154 bytes_in_send_queue -= mq->message_buf_size;
1155 GNUNET_STATISTICS_set (GST_stats,
1157 ("# bytes in message queue for other peers"),
1158 bytes_in_send_queue, GNUNET_NO);
1159 if (GNUNET_OK == success)
1160 GNUNET_STATISTICS_update (GST_stats,
1162 ("# messages transmitted to other peers"),
1165 GNUNET_STATISTICS_update (GST_stats,
1167 ("# transmission failures for messages to other peers"),
1169 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1170 "Sending message to `%s' of type %u was a %s\n",
1171 GNUNET_i2s (receiver),
1172 ntohs (((struct GNUNET_MessageHeader *) mq->message_buf)->type),
1173 (success == GNUNET_OK) ? "success" : "FAILURE");
1174 if (NULL != mq->cont)
1175 mq->cont (mq->cont_cls, success, size_payload, physical);
1181 * Check the message list for the given neighbour and if we can
1182 * send a message, do so. This function should only be called
1183 * if the connection is at least generally ready for transmission.
1184 * While we will only send one message at a time, no bandwidth
1185 * quota management is performed here. If a message was given to
1186 * the plugin, the continuation will automatically re-schedule
1187 * the 'master' task once the next message might be transmitted.
1189 * @param n target peer for which to transmit
1192 try_transmission_to_peer (struct NeighbourMapEntry *n)
1194 struct MessageQueue *mq;
1195 struct GNUNET_TIME_Relative timeout;
1197 if (NULL == n->primary_address.address)
1199 /* no address, why are we here? */
1203 if ((0 == n->primary_address.address->address_length) &&
1204 (NULL == n->primary_address.session))
1206 /* no address, why are we here? */
1210 if (NULL != n->is_active)
1212 /* transmission already pending */
1216 /* timeout messages from the queue that are past their due date */
1217 while (NULL != (mq = n->messages_head))
1219 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1220 if (timeout.rel_value > 0)
1222 GNUNET_STATISTICS_update (GST_stats,
1224 ("# messages timed out while in transport queue"),
1226 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1228 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR, mq->message_buf_size, 0); /* timeout */
1231 return; /* no more messages */
1232 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1234 send_with_session (n,
1235 mq->message_buf, mq->message_buf_size,
1236 0 /* priority */, timeout,
1237 &transmit_send_continuation, mq);
1242 * Send keepalive message to the neighbour. Must only be called
1243 * if we are on 'connected' state or while trying to switch addresses.
1244 * Will internally determine if a keepalive is truly needed (so can
1245 * always be called).
1247 * @param n neighbour that went idle and needs a keepalive
1250 send_keepalive (struct NeighbourMapEntry *n)
1252 struct GNUNET_MessageHeader m;
1254 GNUNET_assert ((S_CONNECTED == n->state) ||
1255 (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
1256 (S_CONNECTED_SWITCHING_CONNECT_SENT));
1257 if (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time).rel_value > 0)
1258 return; /* no keepalive needed at this time */
1259 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1260 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
1261 send_with_session (n,
1262 (const void *) &m, sizeof (m),
1263 UINT32_MAX /* priority */,
1264 KEEPALIVE_FREQUENCY,
1266 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# keepalives sent"), 1,
1268 n->expect_latency_response = GNUNET_YES;
1269 n->last_keep_alive_time = GNUNET_TIME_absolute_get ();
1270 n->keep_alive_time = GNUNET_TIME_relative_to_absolute (KEEPALIVE_FREQUENCY);
1275 * Keep the connection to the given neighbour alive longer,
1276 * we received a KEEPALIVE (or equivalent); send a response.
1278 * @param neighbour neighbour to keep alive (by sending keep alive response)
1281 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
1283 struct NeighbourMapEntry *n;
1284 struct GNUNET_MessageHeader m;
1286 if (NULL == (n = lookup_neighbour (neighbour)))
1288 GNUNET_STATISTICS_update (GST_stats,
1290 ("# KEEPALIVE messages discarded (peer unknown)"),
1294 if (NULL == n->primary_address.session)
1296 GNUNET_STATISTICS_update (GST_stats,
1298 ("# KEEPALIVE messages discarded (no session)"),
1302 /* send reply to allow neighbour to measure latency */
1303 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1304 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE);
1305 send_with_session(n,
1306 (const void *) &m, sizeof (m),
1307 UINT32_MAX /* priority */,
1308 KEEPALIVE_FREQUENCY,
1314 * We received a KEEP_ALIVE_RESPONSE message and use this to calculate
1315 * latency to this peer. Pass the updated information (existing ats
1316 * plus calculated latency) to ATS.
1318 * @param neighbour neighbour to keep alive
1319 * @param ats performance data
1320 * @param ats_count number of entries in ats
1323 GST_neighbours_keepalive_response (const struct GNUNET_PeerIdentity *neighbour,
1324 const struct GNUNET_ATS_Information *ats,
1327 struct NeighbourMapEntry *n;
1329 struct GNUNET_ATS_Information ats_new[ats_count + 1];
1331 if (NULL == (n = lookup_neighbour (neighbour)))
1333 GNUNET_STATISTICS_update (GST_stats,
1335 ("# KEEPALIVE_RESPONSE messages discarded (not connected)"),
1339 if ( (S_CONNECTED != n->state) ||
1340 (GNUNET_YES != n->expect_latency_response) )
1342 GNUNET_STATISTICS_update (GST_stats,
1344 ("# KEEPALIVE_RESPONSE messages discarded (not expected)"),
1348 n->expect_latency_response = GNUNET_NO;
1349 n->latency = GNUNET_TIME_absolute_get_duration (n->last_keep_alive_time);
1350 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1351 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1352 "Latency for peer `%s' is %llu ms\n",
1353 GNUNET_i2s (&n->id), n->latency.rel_value);
1354 memcpy (ats_new, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1355 /* append latency */
1356 ats_new[ats_count].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
1357 if (n->latency.rel_value > UINT32_MAX)
1358 latency = UINT32_MAX;
1360 latency = n->latency.rel_value;
1361 ats_new[ats_count].value = htonl (latency);
1362 GNUNET_ATS_address_update (GST_ats,
1363 n->primary_address.address,
1364 n->primary_address.session, ats_new,
1370 * We have received a message from the given sender. How long should
1371 * we delay before receiving more? (Also used to keep the peer marked
1374 * @param sender sender of the message
1375 * @param size size of the message
1376 * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
1377 * GNUNET_NO if the neighbour is not connected or violates the quota,
1378 * GNUNET_SYSERR if the connection is not fully up yet
1379 * @return how long to wait before reading more from this sender
1381 struct GNUNET_TIME_Relative
1382 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
1383 *sender, ssize_t size, int *do_forward)
1385 struct NeighbourMapEntry *n;
1386 struct GNUNET_TIME_Relative ret;
1388 if (NULL == neighbours)
1390 *do_forward = GNUNET_NO;
1391 return GNUNET_TIME_UNIT_FOREVER_REL; /* This can happen during shutdown */
1393 if (NULL == (n = lookup_neighbour (sender)))
1395 GST_neighbours_try_connect (sender);
1396 if (NULL == (n = lookup_neighbour (sender)))
1398 GNUNET_STATISTICS_update (GST_stats,
1400 ("# messages discarded due to lack of neighbour record"),
1402 *do_forward = GNUNET_NO;
1403 return GNUNET_TIME_UNIT_ZERO;
1406 if (! test_connected (n))
1408 *do_forward = GNUNET_SYSERR;
1409 return GNUNET_TIME_UNIT_ZERO;
1411 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
1413 n->quota_violation_count++;
1414 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1415 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
1416 n->in_tracker.available_bytes_per_s__,
1417 n->quota_violation_count);
1418 /* Discount 32k per violation */
1419 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
1423 if (n->quota_violation_count > 0)
1425 /* try to add 32k back */
1426 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
1427 n->quota_violation_count--;
1430 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
1432 GNUNET_STATISTICS_update (GST_stats,
1434 ("# bandwidth quota violations by other peers"),
1436 *do_forward = GNUNET_NO;
1437 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
1439 *do_forward = GNUNET_YES;
1440 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 32 * 1024);
1441 if (ret.rel_value > 0)
1443 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1444 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
1445 (unsigned long long) n->in_tracker.
1446 consumption_since_last_update__,
1447 (unsigned int) n->in_tracker.available_bytes_per_s__,
1448 (unsigned long long) ret.rel_value);
1449 GNUNET_STATISTICS_update (GST_stats,
1450 gettext_noop ("# ms throttling suggested"),
1451 (int64_t) ret.rel_value, GNUNET_NO);
1458 * Transmit a message to the given target using the active connection.
1460 * @param target destination
1461 * @param msg message to send
1462 * @param msg_size number of bytes in msg
1463 * @param timeout when to fail with timeout
1464 * @param cont function to call when done
1465 * @param cont_cls closure for 'cont'
1468 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
1469 size_t msg_size, struct GNUNET_TIME_Relative timeout,
1470 GST_NeighbourSendContinuation cont, void *cont_cls)
1472 struct NeighbourMapEntry *n;
1473 struct MessageQueue *mq;
1475 /* All ove these cases should never happen; they are all API violations.
1476 But we check anyway, just to be sure. */
1477 if (NULL == (n = lookup_neighbour (target)))
1481 cont (cont_cls, GNUNET_SYSERR, msg_size, 0);
1484 if (GNUNET_YES != test_connected (n))
1488 cont (cont_cls, GNUNET_SYSERR, msg_size, 0);
1491 bytes_in_send_queue += msg_size;
1492 GNUNET_STATISTICS_set (GST_stats,
1494 ("# bytes in message queue for other peers"),
1495 bytes_in_send_queue, GNUNET_NO);
1496 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
1498 mq->cont_cls = cont_cls;
1499 memcpy (&mq[1], msg, msg_size);
1500 mq->message_buf = (const char *) &mq[1];
1501 mq->message_buf_size = msg_size;
1502 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1503 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
1504 if ( (NULL != n->is_active) ||
1505 ( (NULL == n->primary_address.session) && (NULL == n->primary_address.address)) )
1507 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1508 GNUNET_SCHEDULER_cancel (n->task);
1509 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1514 * Send a SESSION_CONNECT message via the given address.
1516 * @param na address to use
1519 send_session_connect (struct NeighbourAddress *na)
1521 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1522 struct SessionConnectMessage connect_msg;
1524 if (NULL == (papi = GST_plugins_find (na->address->transport_name)))
1529 if (NULL == na->session)
1530 na->session = papi->get_session (papi->cls, na->address);
1531 if (NULL == na->session)
1536 na->connect_timestamp = GNUNET_TIME_absolute_get ();
1537 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1538 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
1539 connect_msg.reserved = htonl (0);
1540 connect_msg.timestamp = GNUNET_TIME_absolute_hton (na->connect_timestamp);
1541 (void) papi->send (papi->cls,
1543 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1545 GNUNET_TIME_UNIT_FOREVER_REL,
1552 * Send a SESSION_CONNECT_ACK message via the given address.
1554 * @param address address to use
1555 * @param session session to use
1556 * @param timestamp timestamp to use for the ACK message
1559 send_session_connect_ack_message (const struct GNUNET_HELLO_Address *address,
1560 struct Session *session,
1561 struct GNUNET_TIME_Absolute timestamp)
1563 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1564 struct SessionConnectMessage connect_msg;
1566 if (NULL == (papi = GST_plugins_find (address->transport_name)))
1571 if (NULL == session)
1572 session = papi->get_session (papi->cls, address);
1573 if (NULL == session)
1578 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1579 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK);
1580 connect_msg.reserved = htonl (0);
1581 connect_msg.timestamp = GNUNET_TIME_absolute_hton (timestamp);
1582 (void) papi->send (papi->cls,
1584 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1586 GNUNET_TIME_UNIT_FOREVER_REL,
1593 * Create a fresh entry in the neighbour map for the given peer
1595 * @param peer peer to create an entry for
1596 * @return new neighbour map entry
1598 static struct NeighbourMapEntry *
1599 setup_neighbour (const struct GNUNET_PeerIdentity *peer)
1601 struct NeighbourMapEntry *n;
1603 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1604 "Creating new neighbour entry for `%s'\n",
1606 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
1608 n->state = S_NOT_CONNECTED;
1609 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
1610 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
1611 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
1612 MAX_BANDWIDTH_CARRY_S);
1613 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1614 GNUNET_assert (GNUNET_OK ==
1615 GNUNET_CONTAINER_multihashmap_put (neighbours,
1616 &n->id.hashPubKey, n,
1617 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1623 * Check if the two given addresses are the same.
1624 * Actually only checks if the sessions are non-NULL
1625 * (which they should be) and then if they are identical;
1626 * the actual addresses don't matter if the session
1627 * pointers match anyway, and we must have session pointers
1630 * @param a1 first address to compare
1631 * @param a2 other address to compare
1632 * @return GNUNET_NO if the addresses do not match, GNUNET_YES if they do match
1635 address_matches (const struct NeighbourAddress *a1,
1636 const struct NeighbourAddress *a2)
1638 if ( (NULL == a1->session) ||
1639 (NULL == a2->session) )
1644 return (a1->session == a2->session) ? GNUNET_YES : GNUNET_NO;
1649 * Try to create a connection to the given target (eventually).
1651 * @param target peer to try to connect to
1654 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
1656 struct NeighbourMapEntry *n;
1658 if (NULL == neighbours)
1659 return; /* during shutdown, do nothing */
1660 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1661 "Asked to connect to peer `%s'\n",
1662 GNUNET_i2s (target));
1664 memcmp (target, &GST_my_identity, sizeof (struct GNUNET_PeerIdentity)))
1666 /* refuse to connect to myself */
1667 /* FIXME: can this happen? Is this not an API violation? */
1668 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1669 "Refusing to try to connect to myself.\n");
1672 n = lookup_neighbour (target);
1677 case S_NOT_CONNECTED:
1678 /* this should not be possible */
1680 free_neighbour (n, GNUNET_NO);
1683 case S_INIT_BLACKLIST:
1684 case S_CONNECT_SENT:
1685 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1686 case S_CONNECT_RECV_ATS:
1687 case S_CONNECT_RECV_BLACKLIST:
1688 case S_CONNECT_RECV_ACK:
1689 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1690 "Ignoring request to try to connect to `%s', already trying!\n",
1691 GNUNET_i2s (target));
1692 return; /* already trying */
1694 case S_RECONNECT_ATS:
1695 case S_RECONNECT_BLACKLIST:
1696 case S_RECONNECT_SENT:
1697 case S_CONNECTED_SWITCHING_BLACKLIST:
1698 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1699 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1700 "Ignoring request to try to connect, already connected to `%s'!\n",
1701 GNUNET_i2s (target));
1702 return; /* already connected */
1704 /* get rid of remains, ready to re-try immediately */
1705 free_neighbour (n, GNUNET_NO);
1707 case S_DISCONNECT_FINISHED:
1708 /* should not be possible */
1711 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1713 free_neighbour (n, GNUNET_NO);
1717 n = setup_neighbour (target);
1718 n->state = S_INIT_ATS;
1719 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1721 GNUNET_ATS_reset_backoff (GST_ats, target);
1722 GNUNET_ATS_suggest_address (GST_ats, target);
1727 * Function called with the result of a blacklist check.
1729 * @param cls closure with the 'struct BlackListCheckContext'
1730 * @param peer peer this check affects
1731 * @param result GNUNET_OK if the address is allowed
1734 handle_test_blacklist_cont (void *cls,
1735 const struct GNUNET_PeerIdentity *peer,
1738 struct BlackListCheckContext *bcc = cls;
1739 struct NeighbourMapEntry *n;
1742 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1743 "Connection to new address of peer `%s' based on blacklist is `%s'\n",
1745 (GNUNET_OK == result) ? "allowed" : "FORBIDDEN");
1746 if (NULL == (n = lookup_neighbour (peer)))
1747 goto cleanup; /* nobody left to care about new address */
1750 case S_NOT_CONNECTED:
1751 /* this should not be possible */
1753 free_neighbour (n, GNUNET_NO);
1756 /* still waiting on ATS suggestion */
1758 case S_INIT_BLACKLIST:
1759 /* check if the address the blacklist was fine with matches
1760 ATS suggestion, if so, we can move on! */
1761 if ( (GNUNET_OK == result) &&
1762 (1 == n->send_connect_ack) )
1764 n->send_connect_ack = 2;
1765 send_session_connect_ack_message (bcc->na.address,
1767 n->connect_ack_timestamp);
1769 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1770 break; /* result for an address we currently don't care about */
1771 if (GNUNET_OK == result)
1773 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1774 n->state = S_CONNECT_SENT;
1775 send_session_connect (&n->primary_address);
1779 // FIXME: should also possibly destroy session with plugin!?
1780 GNUNET_ATS_address_destroyed (GST_ats,
1783 free_address (&n->primary_address);
1784 n->state = S_INIT_ATS;
1785 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1786 // FIXME: do we need to ask ATS again for suggestions?
1787 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1790 case S_CONNECT_SENT:
1791 /* waiting on CONNECT_ACK, send ACK if one is pending */
1792 if ( (GNUNET_OK == result) &&
1793 (1 == n->send_connect_ack) )
1795 n->send_connect_ack = 2;
1796 send_session_connect_ack_message (n->primary_address.address,
1797 n->primary_address.session,
1798 n->connect_ack_timestamp);
1801 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1802 if (GNUNET_OK == result)
1804 /* valid new address, let ATS know! */
1805 GNUNET_ATS_address_add (GST_ats,
1808 bcc->ats, bcc->ats_count);
1810 n->state = S_CONNECT_RECV_ATS;
1811 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1812 GNUNET_ATS_reset_backoff (GST_ats, peer);
1813 GNUNET_ATS_suggest_address (GST_ats, peer);
1815 case S_CONNECT_RECV_ATS:
1816 /* still waiting on ATS suggestion, don't care about blacklist */
1818 case S_CONNECT_RECV_BLACKLIST:
1819 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1820 break; /* result for an address we currently don't care about */
1821 if (GNUNET_OK == result)
1823 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1824 n->state = S_CONNECT_RECV_ACK;
1825 send_session_connect_ack_message (bcc->na.address,
1827 n->connect_ack_timestamp);
1828 if (1 == n->send_connect_ack)
1829 n->send_connect_ack = 2;
1833 // FIXME: should also possibly destroy session with plugin!?
1834 GNUNET_ATS_address_destroyed (GST_ats,
1837 free_address (&n->primary_address);
1838 n->state = S_INIT_ATS;
1839 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1840 // FIXME: do we need to ask ATS again for suggestions?
1841 GNUNET_ATS_reset_backoff (GST_ats, peer);
1842 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1845 case S_CONNECT_RECV_ACK:
1846 /* waiting on SESSION_ACK, send ACK if one is pending */
1847 if ( (GNUNET_OK == result) &&
1848 (1 == n->send_connect_ack) )
1850 n->send_connect_ack = 2;
1851 send_session_connect_ack_message (n->primary_address.address,
1852 n->primary_address.session,
1853 n->connect_ack_timestamp);
1857 /* already connected, don't care about blacklist */
1859 case S_RECONNECT_ATS:
1860 /* still waiting on ATS suggestion, don't care about blacklist */
1862 case S_RECONNECT_BLACKLIST:
1863 if ( (GNUNET_OK == result) &&
1864 (1 == n->send_connect_ack) )
1866 n->send_connect_ack = 2;
1867 send_session_connect_ack_message (bcc->na.address,
1869 n->connect_ack_timestamp);
1871 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1872 break; /* result for an address we currently don't care about */
1873 if (GNUNET_OK == result)
1875 send_session_connect (&n->primary_address);
1876 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
1877 n->state = S_RECONNECT_SENT;
1881 GNUNET_ATS_address_destroyed (GST_ats,
1884 n->state = S_RECONNECT_ATS;
1885 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1886 // FIXME: do we need to ask ATS again for suggestions?
1887 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1890 case S_RECONNECT_SENT:
1891 /* waiting on CONNECT_ACK, don't care about blacklist */
1892 if ( (GNUNET_OK == result) &&
1893 (1 == n->send_connect_ack) )
1895 n->send_connect_ack = 2;
1896 send_session_connect_ack_message (n->primary_address.address,
1897 n->primary_address.session,
1898 n->connect_ack_timestamp);
1901 case S_CONNECTED_SWITCHING_BLACKLIST:
1902 if (GNUNET_YES != address_matches (&bcc->na, &n->alternative_address))
1903 break; /* result for an address we currently don't care about */
1904 if (GNUNET_OK == result)
1906 send_session_connect (&n->alternative_address);
1907 n->state = S_CONNECTED_SWITCHING_CONNECT_SENT;
1911 GNUNET_ATS_address_destroyed (GST_ats,
1914 free_address (&n->alternative_address);
1915 n->state = S_CONNECTED;
1918 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1919 /* waiting on CONNECT_ACK, don't care about blacklist */
1920 if ( (GNUNET_OK == result) &&
1921 (1 == n->send_connect_ack) )
1923 n->send_connect_ack = 2;
1924 send_session_connect_ack_message (n->primary_address.address,
1925 n->primary_address.session,
1926 n->connect_ack_timestamp);
1930 /* Nothing to do here, ATS will already do what can be done */
1932 case S_DISCONNECT_FINISHED:
1933 /* should not be possible */
1937 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1939 free_neighbour (n, GNUNET_NO);
1943 GNUNET_HELLO_address_free (bcc->na.address);
1944 GNUNET_CONTAINER_DLL_remove (bc_head,
1952 * We want to know if connecting to a particular peer via
1953 * a particular address is allowed. Check it!
1955 * @param peer identity of the peer to switch the address for
1956 * @param ts time at which the check was initiated
1957 * @param address address of the other peer, NULL if other peer
1959 * @param session session to use (or NULL)
1960 * @param ats performance data
1961 * @param ats_count number of entries in ats (excluding 0-termination)
1964 check_blacklist (const struct GNUNET_PeerIdentity *peer,
1965 struct GNUNET_TIME_Absolute ts,
1966 const struct GNUNET_HELLO_Address *address,
1967 struct Session *session,
1968 const struct GNUNET_ATS_Information *ats,
1971 struct BlackListCheckContext *bcc;
1972 struct GST_BlacklistCheck *bc;
1975 GNUNET_malloc (sizeof (struct BlackListCheckContext) +
1976 sizeof (struct GNUNET_ATS_Information) * ats_count);
1977 bcc->ats_count = ats_count;
1978 bcc->na.address = GNUNET_HELLO_address_copy (address);
1979 bcc->na.session = session;
1980 bcc->na.connect_timestamp = ts;
1981 bcc->ats = (struct GNUNET_ATS_Information *) &bcc[1];
1982 memcpy (bcc->ats, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1983 GNUNET_CONTAINER_DLL_insert (bc_head,
1986 if (NULL != (bc = GST_blacklist_test_allowed (peer,
1987 address->transport_name,
1988 &handle_test_blacklist_cont, bcc)))
1990 /* if NULL == bc, 'cont' was already called and 'bcc' already free'd, so
1991 we must only store 'bc' if 'bc' is non-NULL... */
1996 * We received a 'SESSION_CONNECT' message from the other peer.
1997 * Consider switching to it.
1999 * @param message possibly a 'struct SessionConnectMessage' (check format)
2000 * @param peer identity of the peer to switch the address for
2001 * @param address address of the other peer, NULL if other peer
2003 * @param session session to use (or NULL)
2004 * @param ats performance data
2005 * @param ats_count number of entries in ats (excluding 0-termination)
2008 GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
2009 const struct GNUNET_PeerIdentity *peer,
2010 const struct GNUNET_HELLO_Address *address,
2011 struct Session *session,
2012 const struct GNUNET_ATS_Information *ats,
2015 const struct SessionConnectMessage *scm;
2016 struct NeighbourMapEntry *n;
2017 struct GNUNET_TIME_Absolute ts;
2019 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2020 "Received CONNECT message from peer `%s'\n",
2023 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2025 GNUNET_break_op (0);
2028 if (NULL == neighbours)
2029 return; /* we're shutting down */
2030 scm = (const struct SessionConnectMessage *) message;
2031 GNUNET_break_op (0 == ntohl (scm->reserved));
2032 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2033 n = lookup_neighbour (peer);
2035 n = setup_neighbour (peer);
2036 n->send_connect_ack = 1;
2037 n->connect_ack_timestamp = ts;
2041 case S_NOT_CONNECTED:
2042 n->state = S_CONNECT_RECV_BLACKLIST_INBOUND;
2043 /* Do a blacklist check for the new address */
2044 check_blacklist (peer, ts, address, session, ats, ats_count);
2047 /* CONNECT message takes priority over us asking ATS for address */
2048 n->state = S_CONNECT_RECV_BLACKLIST_INBOUND;
2050 case S_INIT_BLACKLIST:
2051 case S_CONNECT_SENT:
2052 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2053 case S_CONNECT_RECV_ATS:
2054 case S_CONNECT_RECV_BLACKLIST:
2055 case S_CONNECT_RECV_ACK:
2056 /* It can never hurt to have an alternative address in the above cases,
2057 see if it is allowed */
2058 check_blacklist (peer, ts, address, session, ats, ats_count);
2061 /* we are already connected and can thus send the ACK immediately;
2062 still, it can never hurt to have an alternative address, so also
2063 tell ATS about it */
2064 GNUNET_assert (NULL != n->primary_address.address);
2065 GNUNET_assert (NULL != n->primary_address.session);
2066 n->send_connect_ack = 0;
2067 send_session_connect_ack_message (n->primary_address.address,
2068 n->primary_address.session, ts);
2069 check_blacklist (peer, ts, address, session, ats, ats_count);
2071 case S_RECONNECT_ATS:
2072 case S_RECONNECT_BLACKLIST:
2073 case S_RECONNECT_SENT:
2074 /* It can never hurt to have an alternative address in the above cases,
2075 see if it is allowed */
2076 check_blacklist (peer, ts, address, session, ats, ats_count);
2078 case S_CONNECTED_SWITCHING_BLACKLIST:
2079 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2080 /* we are already connected and can thus send the ACK immediately;
2081 still, it can never hurt to have an alternative address, so also
2082 tell ATS about it */
2083 GNUNET_assert (NULL != n->primary_address.address);
2084 GNUNET_assert (NULL != n->primary_address.session);
2085 n->send_connect_ack = 0;
2086 send_session_connect_ack_message (n->primary_address.address,
2087 n->primary_address.session, ts);
2088 check_blacklist (peer, ts, address, session, ats, ats_count);
2091 /* get rid of remains without terminating sessions, ready to re-try */
2092 free_neighbour (n, GNUNET_YES);
2093 n = setup_neighbour (peer);
2094 n->state = S_CONNECT_RECV_ATS;
2095 GNUNET_ATS_reset_backoff (GST_ats, peer);
2096 GNUNET_ATS_suggest_address (GST_ats, peer);
2098 case S_DISCONNECT_FINISHED:
2099 /* should not be possible */
2103 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2105 free_neighbour (n, GNUNET_NO);
2112 * For an existing neighbour record, set the active connection to
2113 * use the given address.
2115 * @param peer identity of the peer to switch the address for
2116 * @param address address of the other peer, NULL if other peer
2118 * @param session session to use (or NULL)
2119 * @param ats performance data
2120 * @param ats_count number of entries in ats
2121 * @param bandwidth_in inbound quota to be used when connection is up
2122 * @param bandwidth_out outbound quota to be used when connection is up
2125 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
2126 const struct GNUNET_HELLO_Address *address,
2127 struct Session *session,
2128 const struct GNUNET_ATS_Information *ats,
2130 struct GNUNET_BANDWIDTH_Value32NBO
2132 struct GNUNET_BANDWIDTH_Value32NBO
2135 struct NeighbourMapEntry *n;
2136 struct GNUNET_TRANSPORT_PluginFunctions *papi;
2138 GNUNET_assert (address->transport_name != NULL);
2139 if (NULL == (n = lookup_neighbour (peer)))
2142 /* Obtain an session for this address from plugin */
2143 if (NULL == (papi = GST_plugins_find (address->transport_name)))
2145 /* we don't have the plugin for this address */
2146 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2149 if ((NULL == session) && (0 == address->address_length))
2152 if (strlen (address->transport_name) > 0)
2153 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2157 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2158 "ATS tells us to switch to address '%s' session %p for "
2159 "peer `%s' in state %s (quota in/out %u %u )\n",
2160 (address->address_length != 0) ? GST_plugins_a2s (address): "<inbound>",
2163 print_state (n->state),
2164 ntohl (bandwidth_in.value__),
2165 ntohl (bandwidth_out.value__));
2167 if (NULL == session)
2169 session = papi->get_session (papi->cls, address);
2170 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2171 "Obtained new session for peer `%s' and address '%s': %p\n",
2172 GNUNET_i2s (&address->peer), GST_plugins_a2s (address), session);
2174 if (NULL == session)
2176 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2177 "Failed to obtain new session for peer `%s' and address '%s'\n",
2178 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
2179 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2184 case S_NOT_CONNECTED:
2186 free_neighbour (n, GNUNET_NO);
2189 set_address (&n->primary_address,
2190 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2191 n->state = S_INIT_BLACKLIST;
2192 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2193 check_blacklist (&n->id,
2194 n->connect_ack_timestamp,
2195 address, session, ats, ats_count);
2197 case S_INIT_BLACKLIST:
2198 /* ATS suggests a different address, switch again */
2199 set_address (&n->primary_address,
2200 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2201 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2202 check_blacklist (&n->id,
2203 n->connect_ack_timestamp,
2204 address, session, ats, ats_count);
2206 case S_CONNECT_SENT:
2207 /* ATS suggests a different address, switch again */
2208 set_address (&n->primary_address,
2209 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2210 n->state = S_INIT_BLACKLIST;
2211 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2212 check_blacklist (&n->id,
2213 n->connect_ack_timestamp,
2214 address, session, ats, ats_count);
2216 case S_CONNECT_RECV_ATS:
2217 set_address (&n->primary_address,
2218 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2219 n->state = S_CONNECT_RECV_BLACKLIST;
2220 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2221 check_blacklist (&n->id,
2222 n->connect_ack_timestamp,
2223 address, session, ats, ats_count);
2225 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2226 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2227 check_blacklist (&n->id,
2228 n->connect_ack_timestamp,
2229 address, session, ats, ats_count);
2231 case S_CONNECT_RECV_BLACKLIST:
2232 case S_CONNECT_RECV_ACK:
2233 /* ATS asks us to switch while we were trying to connect; switch to new
2234 address and check blacklist again */
2235 set_address (&n->primary_address,
2236 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2237 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2238 check_blacklist (&n->id,
2239 n->connect_ack_timestamp,
2240 address, session, ats, ats_count);
2243 GNUNET_assert (NULL != n->primary_address.address);
2244 GNUNET_assert (NULL != n->primary_address.session);
2245 if (n->primary_address.session == session)
2247 /* not an address change, just a quota change */
2248 set_address (&n->primary_address,
2249 address, session, bandwidth_in, bandwidth_out, GNUNET_YES);
2252 /* ATS asks us to switch a life connection; see if we can get
2253 a CONNECT_ACK on it before we actually do this! */
2254 set_address (&n->alternative_address,
2255 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2256 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2257 check_blacklist (&n->id,
2258 GNUNET_TIME_absolute_get (),
2259 address, session, ats, ats_count);
2261 case S_RECONNECT_ATS:
2262 set_address (&n->primary_address,
2263 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2264 n->state = S_RECONNECT_BLACKLIST;
2265 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2266 check_blacklist (&n->id,
2267 n->connect_ack_timestamp,
2268 address, session, ats, ats_count);
2270 case S_RECONNECT_BLACKLIST:
2271 /* ATS asks us to switch while we were trying to reconnect; switch to new
2272 address and check blacklist again */
2273 set_address (&n->primary_address,
2274 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2275 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2276 check_blacklist (&n->id,
2277 n->connect_ack_timestamp,
2278 address, session, ats, ats_count);
2280 case S_RECONNECT_SENT:
2281 /* ATS asks us to switch while we were trying to reconnect; switch to new
2282 address and check blacklist again */
2283 set_address (&n->primary_address,
2284 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2285 n->state = S_RECONNECT_BLACKLIST;
2286 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2287 check_blacklist (&n->id,
2288 n->connect_ack_timestamp,
2289 address, session, ats, ats_count);
2291 case S_CONNECTED_SWITCHING_BLACKLIST:
2292 if (n->primary_address.session == session)
2294 /* ATS switches back to still-active session */
2295 free_address (&n->alternative_address);
2296 n->state = S_CONNECTED;
2299 /* ATS asks us to switch a life connection, update blacklist check */
2300 set_address (&n->alternative_address,
2301 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2302 check_blacklist (&n->id,
2303 GNUNET_TIME_absolute_get (),
2304 address, session, ats, ats_count);
2306 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2307 if (n->primary_address.session == session)
2309 /* ATS switches back to still-active session */
2310 free_address (&n->alternative_address);
2311 n->state = S_CONNECTED;
2314 /* ATS asks us to switch a life connection, update blacklist check */
2315 set_address (&n->alternative_address,
2316 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2317 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2318 check_blacklist (&n->id,
2319 GNUNET_TIME_absolute_get (),
2320 address, session, ats, ats_count);
2323 /* not going to switch addresses while disconnecting */
2325 case S_DISCONNECT_FINISHED:
2329 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2337 * Master task run for every neighbour. Performs all of the time-related
2338 * activities (keep alive, send next message, disconnect if idle, finish
2339 * clean up after disconnect).
2341 * @param cls the 'struct NeighbourMapEntry' for which we are running
2342 * @param tc scheduler context (unused)
2345 master_task (void *cls,
2346 const struct GNUNET_SCHEDULER_TaskContext *tc)
2348 struct NeighbourMapEntry *n = cls;
2349 struct GNUNET_TIME_Relative delay;
2351 n->task = GNUNET_SCHEDULER_NO_TASK;
2352 delay = GNUNET_TIME_absolute_get_remaining (n->timeout);
2353 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2354 "Master task runs for neighbour `%s' in state %s with timeout in %llu ms\n",
2355 GNUNET_i2s (&n->id),
2356 print_state(n->state),
2357 (unsigned long long) delay.rel_value);
2360 case S_NOT_CONNECTED:
2361 /* invalid state for master task, clean up */
2363 n->state = S_DISCONNECT_FINISHED;
2364 free_neighbour (n, GNUNET_NO);
2367 if (0 == delay.rel_value)
2369 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2370 "Connection to `%s' timed out waiting for ATS to provide address\n",
2371 GNUNET_i2s (&n->id));
2372 n->state = S_DISCONNECT_FINISHED;
2373 free_neighbour (n, GNUNET_NO);
2377 case S_INIT_BLACKLIST:
2378 if (0 == delay.rel_value)
2380 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2381 "Connection to `%s' timed out waiting for BLACKLIST to approve address\n",
2382 GNUNET_i2s (&n->id));
2383 n->state = S_DISCONNECT_FINISHED;
2384 free_neighbour (n, GNUNET_NO);
2388 case S_CONNECT_SENT:
2389 if (0 == delay.rel_value)
2391 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2392 "Connection to `%s' timed out waiting for other peer to send CONNECT_ACK\n",
2393 GNUNET_i2s (&n->id));
2394 disconnect_neighbour (n);
2398 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2399 if (0 == delay.rel_value)
2401 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2402 "Connection to `%s' timed out waiting BLACKLIST to approve address to use for received CONNECT\n",
2403 GNUNET_i2s (&n->id));
2404 n->state = S_DISCONNECT_FINISHED;
2405 free_neighbour (n, GNUNET_NO);
2409 case S_CONNECT_RECV_ATS:
2410 if (0 == delay.rel_value)
2412 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2413 "Connection to `%s' timed out waiting ATS to provide address to use for CONNECT_ACK\n",
2414 GNUNET_i2s (&n->id));
2415 n->state = S_DISCONNECT_FINISHED;
2416 free_neighbour (n, GNUNET_NO);
2420 case S_CONNECT_RECV_BLACKLIST:
2421 if (0 == delay.rel_value)
2423 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2424 "Connection to `%s' timed out waiting BLACKLIST to approve address to use for CONNECT_ACK\n",
2425 GNUNET_i2s (&n->id));
2426 n->state = S_DISCONNECT_FINISHED;
2427 free_neighbour (n, GNUNET_NO);
2431 case S_CONNECT_RECV_ACK:
2432 if (0 == delay.rel_value)
2434 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2435 "Connection to `%s' timed out waiting for other peer to send SESSION_ACK\n",
2436 GNUNET_i2s (&n->id));
2437 disconnect_neighbour (n);
2442 if (0 == delay.rel_value)
2444 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2445 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2446 GNUNET_i2s (&n->id));
2447 disconnect_neighbour (n);
2450 try_transmission_to_peer (n);
2453 case S_RECONNECT_ATS:
2454 if (0 == delay.rel_value)
2456 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2457 "Connection to `%s' timed out, waiting for ATS replacement address\n",
2458 GNUNET_i2s (&n->id));
2459 disconnect_neighbour (n);
2463 case S_RECONNECT_BLACKLIST:
2464 if (0 == delay.rel_value)
2466 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2467 "Connection to `%s' timed out, waiting for BLACKLIST to approve replacement address\n",
2468 GNUNET_i2s (&n->id));
2469 disconnect_neighbour (n);
2473 case S_RECONNECT_SENT:
2474 if (0 == delay.rel_value)
2476 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2477 "Connection to `%s' timed out, waiting for other peer to CONNECT_ACK replacement address\n",
2478 GNUNET_i2s (&n->id));
2479 disconnect_neighbour (n);
2483 case S_CONNECTED_SWITCHING_BLACKLIST:
2484 if (0 == delay.rel_value)
2486 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2487 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2488 GNUNET_i2s (&n->id));
2489 disconnect_neighbour (n);
2492 try_transmission_to_peer (n);
2495 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2496 if (0 == delay.rel_value)
2498 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2499 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs (after trying to CONNECT on alternative address)\n",
2500 GNUNET_i2s (&n->id));
2501 disconnect_neighbour (n);
2504 try_transmission_to_peer (n);
2508 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2509 "Cleaning up connection to `%s' after sending DISCONNECT\n",
2510 GNUNET_i2s (&n->id));
2511 free_neighbour (n, GNUNET_NO);
2513 case S_DISCONNECT_FINISHED:
2514 /* how did we get here!? */
2518 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2522 if ( (S_CONNECTED_SWITCHING_CONNECT_SENT == n->state) ||
2523 (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
2524 (S_CONNECTED == n->state) )
2526 /* if we are *now* in one of these three states, we're sending
2527 keep alive messages, so we need to consider the keepalive
2528 delay, not just the connection timeout */
2529 delay = GNUNET_TIME_relative_min (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time),
2532 if (GNUNET_SCHEDULER_NO_TASK == n->task)
2533 n->task = GNUNET_SCHEDULER_add_delayed (delay,
2540 * Send a SESSION_ACK message to the neighbour to confirm that we
2541 * got his CONNECT_ACK.
2543 * @param n neighbour to send the SESSION_ACK to
2546 send_session_ack_message (struct NeighbourMapEntry *n)
2548 struct GNUNET_MessageHeader msg;
2550 msg.size = htons (sizeof (struct GNUNET_MessageHeader));
2551 msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK);
2552 (void) send_with_session(n,
2553 (const char *) &msg, sizeof (struct GNUNET_MessageHeader),
2554 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
2560 * We received a 'SESSION_CONNECT_ACK' message from the other peer.
2561 * Consider switching to it.
2563 * @param message possibly a 'struct SessionConnectMessage' (check format)
2564 * @param peer identity of the peer to switch the address for
2565 * @param address address of the other peer, NULL if other peer
2567 * @param session session to use (or NULL)
2568 * @param ats performance data
2569 * @param ats_count number of entries in ats
2572 GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
2573 const struct GNUNET_PeerIdentity *peer,
2574 const struct GNUNET_HELLO_Address *address,
2575 struct Session *session,
2576 const struct GNUNET_ATS_Information *ats,
2579 const struct SessionConnectMessage *scm;
2580 struct GNUNET_TIME_Absolute ts;
2581 struct NeighbourMapEntry *n;
2583 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2584 "Received CONNECT_ACK message from peer `%s'\n",
2587 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2589 GNUNET_break_op (0);
2592 scm = (const struct SessionConnectMessage *) message;
2593 GNUNET_break_op (ntohl (scm->reserved) == 0);
2594 if (NULL == (n = lookup_neighbour (peer)))
2596 GNUNET_STATISTICS_update (GST_stats,
2598 ("# unexpected CONNECT_ACK messages (no peer)"),
2602 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2605 case S_NOT_CONNECTED:
2607 free_neighbour (n, GNUNET_NO);
2610 case S_INIT_BLACKLIST:
2611 GNUNET_STATISTICS_update (GST_stats,
2613 ("# unexpected CONNECT_ACK messages (not ready)"),
2616 case S_CONNECT_SENT:
2617 if (ts.abs_value != n->primary_address.connect_timestamp.abs_value)
2618 break; /* ACK does not match our original CONNECT message */
2619 n->state = S_CONNECTED;
2620 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2621 GNUNET_STATISTICS_set (GST_stats,
2622 gettext_noop ("# peers connected"),
2623 ++neighbours_connected,
2625 connect_notify_cb (callback_cls, &n->id, ats, ats_count,
2626 n->primary_address.bandwidth_in,
2627 n->primary_address.bandwidth_out);
2628 /* Tell ATS that the outbound session we created to send CONNECT was successfull */
2629 GNUNET_ATS_address_add (GST_ats,
2630 n->primary_address.address,
2631 n->primary_address.session,
2633 set_address (&n->primary_address,
2634 n->primary_address.address,
2635 n->primary_address.session,
2636 n->primary_address.bandwidth_in,
2637 n->primary_address.bandwidth_out,
2639 send_session_ack_message (n);
2641 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2642 case S_CONNECT_RECV_ATS:
2643 case S_CONNECT_RECV_BLACKLIST:
2644 case S_CONNECT_RECV_ACK:
2645 GNUNET_STATISTICS_update (GST_stats,
2647 ("# unexpected CONNECT_ACK messages (not ready)"),
2651 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2652 send_session_ack_message (n);
2654 case S_RECONNECT_ATS:
2655 case S_RECONNECT_BLACKLIST:
2656 /* we didn't expect any CONNECT_ACK, as we are waiting for ATS
2657 to give us a new address... */
2658 GNUNET_STATISTICS_update (GST_stats,
2660 ("# unexpected CONNECT_ACK messages (waiting on ATS)"),
2663 case S_RECONNECT_SENT:
2664 /* new address worked; go back to connected! */
2665 n->state = S_CONNECTED;
2666 send_session_ack_message (n);
2668 case S_CONNECTED_SWITCHING_BLACKLIST:
2669 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2670 send_session_ack_message (n);
2672 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2673 /* new address worked; adopt it and go back to connected! */
2674 n->state = S_CONNECTED;
2675 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2676 GNUNET_break (GNUNET_NO == n->alternative_address.ats_active);
2677 GNUNET_ATS_address_add(GST_ats,
2678 n->alternative_address.address,
2679 n->alternative_address.session,
2681 set_address (&n->primary_address,
2682 n->alternative_address.address,
2683 n->alternative_address.session,
2684 n->alternative_address.bandwidth_in,
2685 n->alternative_address.bandwidth_out,
2687 free_address (&n->alternative_address);
2688 send_session_ack_message (n);
2691 GNUNET_STATISTICS_update (GST_stats,
2693 ("# unexpected CONNECT_ACK messages (disconnecting)"),
2696 case S_DISCONNECT_FINISHED:
2700 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2708 * A session was terminated. Take note; if needed, try to get
2709 * an alternative address from ATS.
2711 * @param peer identity of the peer where the session died
2712 * @param session session that is gone
2713 * @return GNUNET_YES if this was a session used, GNUNET_NO if
2714 * this session was not in use
2717 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
2718 struct Session *session)
2720 struct NeighbourMapEntry *n;
2721 struct BlackListCheckContext *bcc;
2722 struct BlackListCheckContext *bcc_next;
2724 /* make sure to cancel all ongoing blacklist checks involving 'session' */
2726 while (NULL != (bcc = bcc_next))
2728 bcc_next = bcc->next;
2729 if (bcc->na.session == session)
2731 GST_blacklist_test_cancel (bcc->bc);
2732 GNUNET_HELLO_address_free (bcc->na.address);
2733 GNUNET_CONTAINER_DLL_remove (bc_head,
2739 if (NULL == (n = lookup_neighbour (peer)))
2740 return GNUNET_NO; /* can't affect us */
2741 if (session != n->primary_address.session)
2743 if (session == n->alternative_address.session)
2745 free_address (&n->alternative_address);
2746 if ( (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
2747 (S_CONNECTED_SWITCHING_CONNECT_SENT == n->state) )
2748 n->state = S_CONNECTED;
2752 return GNUNET_NO; /* doesn't affect us further */
2755 n->expect_latency_response = GNUNET_NO;
2758 case S_NOT_CONNECTED:
2760 free_neighbour (n, GNUNET_NO);
2764 free_neighbour (n, GNUNET_NO);
2766 case S_INIT_BLACKLIST:
2767 case S_CONNECT_SENT:
2768 free_address (&n->primary_address);
2769 n->state = S_INIT_ATS;
2770 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2771 // FIXME: need to ask ATS for suggestions again?
2772 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2774 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2775 case S_CONNECT_RECV_ATS:
2776 case S_CONNECT_RECV_BLACKLIST:
2777 case S_CONNECT_RECV_ACK:
2778 /* error on inbound session; free neighbour entirely */
2779 free_address (&n->primary_address);
2780 free_neighbour (n, GNUNET_NO);
2783 free_address (&n->primary_address);
2784 n->state = S_RECONNECT_ATS;
2785 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2786 /* FIXME: is this ATS call needed? */
2787 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2789 case S_RECONNECT_ATS:
2790 /* we don't have an address, how can it go down? */
2793 case S_RECONNECT_BLACKLIST:
2794 case S_RECONNECT_SENT:
2795 n->state = S_RECONNECT_ATS;
2796 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2797 // FIXME: need to ask ATS for suggestions again?
2798 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2800 case S_CONNECTED_SWITCHING_BLACKLIST:
2801 /* primary went down while we were checking secondary against
2802 blacklist, adopt secondary as primary */
2803 free_address (&n->primary_address);
2804 n->primary_address = n->alternative_address;
2805 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2806 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2807 n->state = S_RECONNECT_BLACKLIST;
2809 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2810 /* primary went down while we were waiting for CONNECT_ACK on secondary;
2811 secondary as primary */
2812 free_address (&n->primary_address);
2813 n->primary_address = n->alternative_address;
2814 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2815 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2816 n->state = S_RECONNECT_SENT;
2819 free_address (&n->primary_address);
2821 case S_DISCONNECT_FINISHED:
2822 /* neighbour was freed and plugins told to terminate session */
2826 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2830 if (GNUNET_SCHEDULER_NO_TASK != n->task)
2831 GNUNET_SCHEDULER_cancel (n->task);
2832 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
2838 * We received a 'SESSION_ACK' message from the other peer.
2839 * If we sent a 'CONNECT_ACK' last, this means we are now
2840 * connected. Otherwise, do nothing.
2842 * @param message possibly a 'struct SessionConnectMessage' (check format)
2843 * @param peer identity of the peer to switch the address for
2844 * @param address address of the other peer, NULL if other peer
2846 * @param session session to use (or NULL)
2847 * @param ats performance data
2848 * @param ats_count number of entries in ats
2851 GST_neighbours_handle_session_ack (const struct GNUNET_MessageHeader *message,
2852 const struct GNUNET_PeerIdentity *peer,
2853 const struct GNUNET_HELLO_Address *address,
2854 struct Session *session,
2855 const struct GNUNET_ATS_Information *ats,
2858 struct NeighbourMapEntry *n;
2860 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2861 "Received SESSION_ACK message from peer `%s'\n",
2863 if (ntohs (message->size) != sizeof (struct GNUNET_MessageHeader))
2865 GNUNET_break_op (0);
2868 if (NULL == (n = lookup_neighbour (peer)))
2870 /* check if we are in a plausible state for having sent
2871 a CONNECT_ACK. If not, return, otherwise break */
2872 if ( ( (S_CONNECT_RECV_ACK != n->state) &&
2873 (S_CONNECT_SENT != n->state) ) ||
2874 (2 != n->send_connect_ack) )
2876 GNUNET_STATISTICS_update (GST_stats,
2877 gettext_noop ("# unexpected SESSION ACK messages"), 1,
2881 n->state = S_CONNECTED;
2882 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2883 GNUNET_STATISTICS_set (GST_stats,
2884 gettext_noop ("# peers connected"),
2885 ++neighbours_connected,
2887 connect_notify_cb (callback_cls, &n->id, ats, ats_count,
2888 n->primary_address.bandwidth_in,
2889 n->primary_address.bandwidth_out);
2890 GNUNET_ATS_address_add(GST_ats,
2891 n->primary_address.address,
2892 n->primary_address.session,
2894 set_address (&n->primary_address,
2895 n->primary_address.address,
2896 n->primary_address.session,
2897 n->primary_address.bandwidth_in,
2898 n->primary_address.bandwidth_out,
2904 * Test if we're connected to the given peer.
2906 * @param target peer to test
2907 * @return GNUNET_YES if we are connected, GNUNET_NO if not
2910 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
2912 return test_connected (lookup_neighbour (target));
2917 * Change the incoming quota for the given peer.
2919 * @param neighbour identity of peer to change qutoa for
2920 * @param quota new quota
2923 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
2924 struct GNUNET_BANDWIDTH_Value32NBO quota)
2926 struct NeighbourMapEntry *n;
2928 if (NULL == (n = lookup_neighbour (neighbour)))
2930 GNUNET_STATISTICS_update (GST_stats,
2932 ("# SET QUOTA messages ignored (no such peer)"),
2936 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2937 "Setting inbound quota of %u Bps for peer `%s' to all clients\n",
2938 ntohl (quota.value__), GNUNET_i2s (&n->id));
2939 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
2940 if (0 != ntohl (quota.value__))
2942 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
2943 GNUNET_i2s (&n->id), "SET_QUOTA");
2944 if (GNUNET_YES == test_connected (n))
2945 GNUNET_STATISTICS_update (GST_stats,
2946 gettext_noop ("# disconnects due to quota of 0"),
2948 disconnect_neighbour (n);
2953 * We received a disconnect message from the given peer,
2954 * validate and process.
2956 * @param peer sender of the message
2957 * @param msg the disconnect message
2960 GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity
2962 const struct GNUNET_MessageHeader
2965 struct NeighbourMapEntry *n;
2966 const struct SessionDisconnectMessage *sdm;
2967 struct GNUNET_HashCode hc;
2969 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2970 "Received DISCONNECT message from peer `%s'\n",
2972 if (ntohs (msg->size) != sizeof (struct SessionDisconnectMessage))
2974 // GNUNET_break_op (0);
2975 GNUNET_STATISTICS_update (GST_stats,
2977 ("# disconnect messages ignored (old format)"), 1,
2981 sdm = (const struct SessionDisconnectMessage *) msg;
2982 if (NULL == (n = lookup_neighbour (peer)))
2983 return; /* gone already */
2984 if (GNUNET_TIME_absolute_ntoh (sdm->timestamp).abs_value <= n->connect_ack_timestamp.abs_value)
2986 GNUNET_STATISTICS_update (GST_stats,
2988 ("# disconnect messages ignored (timestamp)"), 1,
2992 GNUNET_CRYPTO_hash (&sdm->public_key,
2993 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2995 if (0 != memcmp (peer, &hc, sizeof (struct GNUNET_PeerIdentity)))
2997 GNUNET_break_op (0);
3000 if (ntohl (sdm->purpose.size) !=
3001 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3002 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
3003 sizeof (struct GNUNET_TIME_AbsoluteNBO))
3005 GNUNET_break_op (0);
3009 GNUNET_CRYPTO_rsa_verify
3010 (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT, &sdm->purpose,
3011 &sdm->signature, &sdm->public_key))
3013 GNUNET_break_op (0);
3016 if (GNUNET_YES == test_connected (n))
3017 GNUNET_STATISTICS_update (GST_stats,
3019 ("# other peer asked to disconnect from us"), 1,
3021 disconnect_neighbour (n);
3026 * Closure for the neighbours_iterate function.
3028 struct IteratorContext
3031 * Function to call on each connected neighbour.
3033 GST_NeighbourIterator cb;
3043 * Call the callback from the closure for each connected neighbour.
3045 * @param cls the 'struct IteratorContext'
3046 * @param key the hash of the public key of the neighbour
3047 * @param value the 'struct NeighbourMapEntry'
3048 * @return GNUNET_OK (continue to iterate)
3051 neighbours_iterate (void *cls, const struct GNUNET_HashCode * key, void *value)
3053 struct IteratorContext *ic = cls;
3054 struct NeighbourMapEntry *n = value;
3056 if (GNUNET_YES == test_connected (n))
3058 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in;
3059 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out;
3061 if (NULL != n->primary_address.address)
3063 bandwidth_in = n->primary_address.bandwidth_in;
3064 bandwidth_out = n->primary_address.bandwidth_out;
3068 bandwidth_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
3069 bandwidth_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
3072 ic->cb (ic->cb_cls, &n->id, NULL, 0,
3073 n->primary_address.address,
3074 bandwidth_in, bandwidth_out);
3081 * Iterate over all connected neighbours.
3083 * @param cb function to call
3084 * @param cb_cls closure for cb
3087 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
3089 struct IteratorContext ic;
3091 if (NULL == neighbours)
3092 return; /* can happen during shutdown */
3095 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
3100 * If we have an active connection to the given target, it must be shutdown.
3102 * @param target peer to disconnect from
3105 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
3107 struct NeighbourMapEntry *n;
3109 if (NULL == (n = lookup_neighbour (target)))
3110 return; /* not active */
3111 if (GNUNET_YES == test_connected (n))
3112 GNUNET_STATISTICS_update (GST_stats,
3114 ("# disconnected from peer upon explicit request"), 1,
3116 disconnect_neighbour (n);
3121 * Obtain current latency information for the given neighbour.
3123 * @param peer to get the latency for
3124 * @return observed latency of the address, FOREVER if the
3125 * the connection is not up
3127 struct GNUNET_TIME_Relative
3128 GST_neighbour_get_latency (const struct GNUNET_PeerIdentity *peer)
3130 struct NeighbourMapEntry *n;
3132 n = lookup_neighbour (peer);
3134 return GNUNET_TIME_UNIT_FOREVER_REL;
3138 case S_CONNECTED_SWITCHING_CONNECT_SENT:
3139 case S_CONNECTED_SWITCHING_BLACKLIST:
3140 case S_RECONNECT_SENT:
3141 case S_RECONNECT_ATS:
3142 case S_RECONNECT_BLACKLIST:
3144 case S_NOT_CONNECTED:
3145 case S_INIT_BLACKLIST:
3147 case S_CONNECT_RECV_BLACKLIST_INBOUND:
3148 case S_CONNECT_RECV_ATS:
3149 case S_CONNECT_RECV_BLACKLIST:
3150 case S_CONNECT_RECV_ACK:
3151 case S_CONNECT_SENT:
3153 case S_DISCONNECT_FINISHED:
3154 return GNUNET_TIME_UNIT_FOREVER_REL;
3156 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
3160 return GNUNET_TIME_UNIT_FOREVER_REL;
3165 * Obtain current address information for the given neighbour.
3168 * @return address currently used
3170 struct GNUNET_HELLO_Address *
3171 GST_neighbour_get_current_address (const struct GNUNET_PeerIdentity *peer)
3173 struct NeighbourMapEntry *n;
3175 n = lookup_neighbour (peer);
3178 return n->primary_address.address;
3183 * Initialize the neighbours subsystem.
3185 * @param cls closure for callbacks
3186 * @param connect_cb function to call if we connect to a peer
3187 * @param disconnect_cb function to call if we disconnect from a peer
3188 * @param peer_address_cb function to call if we change an active address
3192 GST_neighbours_start (void *cls,
3193 NotifyConnect connect_cb,
3194 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb,
3195 GNUNET_TRANSPORT_PeerIterateCallback peer_address_cb)
3198 connect_notify_cb = connect_cb;
3199 disconnect_notify_cb = disconnect_cb;
3200 address_change_cb = peer_address_cb;
3201 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE, GNUNET_NO);
3206 * Disconnect from the given neighbour.
3209 * @param key hash of neighbour's public key (not used)
3210 * @param value the 'struct NeighbourMapEntry' of the neighbour
3211 * @return GNUNET_OK (continue to iterate)
3214 disconnect_all_neighbours (void *cls, const struct GNUNET_HashCode * key, void *value)
3216 struct NeighbourMapEntry *n = value;
3218 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3219 "Disconnecting peer `%4s', %s\n",
3220 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
3221 n->state = S_DISCONNECT_FINISHED;
3222 free_neighbour (n, GNUNET_NO);
3228 * Cleanup the neighbours subsystem.
3231 GST_neighbours_stop ()
3233 if (NULL == neighbours)
3235 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
3236 &disconnect_all_neighbours,
3238 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
3240 callback_cls = NULL;
3241 connect_notify_cb = NULL;
3242 disconnect_notify_cb = NULL;
3243 address_change_cb = NULL;
3247 /* end of file gnunet-service-transport_neighbours.c */