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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 if (bytes_in_send_queue < mq->message_buf_size)
1154 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1155 "bytes_in_send_queue `%u' mq->message_buf_size %u\n",
1156 bytes_in_send_queue, mq->message_buf_size );
1161 GNUNET_break (size_payload == mq->message_buf_size);
1162 bytes_in_send_queue -= mq->message_buf_size;
1163 GNUNET_STATISTICS_set (GST_stats,
1165 ("# bytes in message queue for other peers"),
1166 bytes_in_send_queue, GNUNET_NO);
1167 if (GNUNET_OK == success)
1168 GNUNET_STATISTICS_update (GST_stats,
1170 ("# messages transmitted to other peers"),
1173 GNUNET_STATISTICS_update (GST_stats,
1175 ("# transmission failures for messages to other peers"),
1177 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1178 "Sending message to `%s' of type %u was a %s\n",
1179 GNUNET_i2s (receiver),
1180 ntohs (((struct GNUNET_MessageHeader *) mq->message_buf)->type),
1181 (success == GNUNET_OK) ? "success" : "FAILURE");
1182 if (NULL != mq->cont)
1183 mq->cont (mq->cont_cls, success, size_payload, physical);
1189 * Check the message list for the given neighbour and if we can
1190 * send a message, do so. This function should only be called
1191 * if the connection is at least generally ready for transmission.
1192 * While we will only send one message at a time, no bandwidth
1193 * quota management is performed here. If a message was given to
1194 * the plugin, the continuation will automatically re-schedule
1195 * the 'master' task once the next message might be transmitted.
1197 * @param n target peer for which to transmit
1200 try_transmission_to_peer (struct NeighbourMapEntry *n)
1202 struct MessageQueue *mq;
1203 struct GNUNET_TIME_Relative timeout;
1205 if (NULL == n->primary_address.address)
1207 /* no address, why are we here? */
1211 if ((0 == n->primary_address.address->address_length) &&
1212 (NULL == n->primary_address.session))
1214 /* no address, why are we here? */
1218 if (NULL != n->is_active)
1220 /* transmission already pending */
1224 /* timeout messages from the queue that are past their due date */
1225 while (NULL != (mq = n->messages_head))
1227 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1228 if (timeout.rel_value > 0)
1230 GNUNET_STATISTICS_update (GST_stats,
1232 ("# messages timed out while in transport queue"),
1234 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1236 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR, mq->message_buf_size, 0); /* timeout */
1239 return; /* no more messages */
1240 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1242 send_with_session (n,
1243 mq->message_buf, mq->message_buf_size,
1244 0 /* priority */, timeout,
1245 &transmit_send_continuation, mq);
1250 * Send keepalive message to the neighbour. Must only be called
1251 * if we are on 'connected' state or while trying to switch addresses.
1252 * Will internally determine if a keepalive is truly needed (so can
1253 * always be called).
1255 * @param n neighbour that went idle and needs a keepalive
1258 send_keepalive (struct NeighbourMapEntry *n)
1260 struct GNUNET_MessageHeader m;
1262 GNUNET_assert ((S_CONNECTED == n->state) ||
1263 (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
1264 (S_CONNECTED_SWITCHING_CONNECT_SENT));
1265 if (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time).rel_value > 0)
1266 return; /* no keepalive needed at this time */
1267 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1268 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
1269 send_with_session (n,
1270 (const void *) &m, sizeof (m),
1271 UINT32_MAX /* priority */,
1272 KEEPALIVE_FREQUENCY,
1274 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# keepalives sent"), 1,
1276 n->expect_latency_response = GNUNET_YES;
1277 n->last_keep_alive_time = GNUNET_TIME_absolute_get ();
1278 n->keep_alive_time = GNUNET_TIME_relative_to_absolute (KEEPALIVE_FREQUENCY);
1283 * Keep the connection to the given neighbour alive longer,
1284 * we received a KEEPALIVE (or equivalent); send a response.
1286 * @param neighbour neighbour to keep alive (by sending keep alive response)
1289 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
1291 struct NeighbourMapEntry *n;
1292 struct GNUNET_MessageHeader m;
1294 if (NULL == (n = lookup_neighbour (neighbour)))
1296 GNUNET_STATISTICS_update (GST_stats,
1298 ("# KEEPALIVE messages discarded (peer unknown)"),
1302 if (NULL == n->primary_address.session)
1304 GNUNET_STATISTICS_update (GST_stats,
1306 ("# KEEPALIVE messages discarded (no session)"),
1310 /* send reply to allow neighbour to measure latency */
1311 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1312 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE);
1313 send_with_session(n,
1314 (const void *) &m, sizeof (m),
1315 UINT32_MAX /* priority */,
1316 KEEPALIVE_FREQUENCY,
1322 * We received a KEEP_ALIVE_RESPONSE message and use this to calculate
1323 * latency to this peer. Pass the updated information (existing ats
1324 * plus calculated latency) to ATS.
1326 * @param neighbour neighbour to keep alive
1327 * @param ats performance data
1328 * @param ats_count number of entries in ats
1331 GST_neighbours_keepalive_response (const struct GNUNET_PeerIdentity *neighbour,
1332 const struct GNUNET_ATS_Information *ats,
1335 struct NeighbourMapEntry *n;
1337 struct GNUNET_ATS_Information ats_new[ats_count + 1];
1339 if (NULL == (n = lookup_neighbour (neighbour)))
1341 GNUNET_STATISTICS_update (GST_stats,
1343 ("# KEEPALIVE_RESPONSE messages discarded (not connected)"),
1347 if ( (S_CONNECTED != n->state) ||
1348 (GNUNET_YES != n->expect_latency_response) )
1350 GNUNET_STATISTICS_update (GST_stats,
1352 ("# KEEPALIVE_RESPONSE messages discarded (not expected)"),
1356 n->expect_latency_response = GNUNET_NO;
1357 n->latency = GNUNET_TIME_absolute_get_duration (n->last_keep_alive_time);
1358 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1359 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1360 "Latency for peer `%s' is %llu ms\n",
1361 GNUNET_i2s (&n->id), n->latency.rel_value);
1362 memcpy (ats_new, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1363 /* append latency */
1364 ats_new[ats_count].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
1365 if (n->latency.rel_value > UINT32_MAX)
1366 latency = UINT32_MAX;
1368 latency = n->latency.rel_value;
1369 ats_new[ats_count].value = htonl (latency);
1370 GNUNET_ATS_address_update (GST_ats,
1371 n->primary_address.address,
1372 n->primary_address.session, ats_new,
1378 * We have received a message from the given sender. How long should
1379 * we delay before receiving more? (Also used to keep the peer marked
1382 * @param sender sender of the message
1383 * @param size size of the message
1384 * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
1385 * GNUNET_NO if the neighbour is not connected or violates the quota,
1386 * GNUNET_SYSERR if the connection is not fully up yet
1387 * @return how long to wait before reading more from this sender
1389 struct GNUNET_TIME_Relative
1390 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
1391 *sender, ssize_t size, int *do_forward)
1393 struct NeighbourMapEntry *n;
1394 struct GNUNET_TIME_Relative ret;
1396 if (NULL == neighbours)
1398 *do_forward = GNUNET_NO;
1399 return GNUNET_TIME_UNIT_FOREVER_REL; /* This can happen during shutdown */
1401 if (NULL == (n = lookup_neighbour (sender)))
1403 GST_neighbours_try_connect (sender);
1404 if (NULL == (n = lookup_neighbour (sender)))
1406 GNUNET_STATISTICS_update (GST_stats,
1408 ("# messages discarded due to lack of neighbour record"),
1410 *do_forward = GNUNET_NO;
1411 return GNUNET_TIME_UNIT_ZERO;
1414 if (! test_connected (n))
1416 *do_forward = GNUNET_SYSERR;
1417 return GNUNET_TIME_UNIT_ZERO;
1419 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
1421 n->quota_violation_count++;
1422 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1423 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
1424 n->in_tracker.available_bytes_per_s__,
1425 n->quota_violation_count);
1426 /* Discount 32k per violation */
1427 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
1431 if (n->quota_violation_count > 0)
1433 /* try to add 32k back */
1434 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
1435 n->quota_violation_count--;
1438 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
1440 GNUNET_STATISTICS_update (GST_stats,
1442 ("# bandwidth quota violations by other peers"),
1444 *do_forward = GNUNET_NO;
1445 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
1447 *do_forward = GNUNET_YES;
1448 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 32 * 1024);
1449 if (ret.rel_value > 0)
1451 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1452 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
1453 (unsigned long long) n->in_tracker.
1454 consumption_since_last_update__,
1455 (unsigned int) n->in_tracker.available_bytes_per_s__,
1456 (unsigned long long) ret.rel_value);
1457 GNUNET_STATISTICS_update (GST_stats,
1458 gettext_noop ("# ms throttling suggested"),
1459 (int64_t) ret.rel_value, GNUNET_NO);
1466 * Transmit a message to the given target using the active connection.
1468 * @param target destination
1469 * @param msg message to send
1470 * @param msg_size number of bytes in msg
1471 * @param timeout when to fail with timeout
1472 * @param cont function to call when done
1473 * @param cont_cls closure for 'cont'
1476 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
1477 size_t msg_size, struct GNUNET_TIME_Relative timeout,
1478 GST_NeighbourSendContinuation cont, void *cont_cls)
1480 struct NeighbourMapEntry *n;
1481 struct MessageQueue *mq;
1483 /* All ove these cases should never happen; they are all API violations.
1484 But we check anyway, just to be sure. */
1485 if (NULL == (n = lookup_neighbour (target)))
1489 cont (cont_cls, GNUNET_SYSERR, msg_size, 0);
1492 if (GNUNET_YES != test_connected (n))
1496 cont (cont_cls, GNUNET_SYSERR, msg_size, 0);
1499 bytes_in_send_queue += msg_size;
1500 GNUNET_STATISTICS_set (GST_stats,
1502 ("# bytes in message queue for other peers"),
1503 bytes_in_send_queue, GNUNET_NO);
1504 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
1506 mq->cont_cls = cont_cls;
1507 memcpy (&mq[1], msg, msg_size);
1508 mq->message_buf = (const char *) &mq[1];
1509 mq->message_buf_size = msg_size;
1510 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1511 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
1512 if ( (NULL != n->is_active) ||
1513 ( (NULL == n->primary_address.session) && (NULL == n->primary_address.address)) )
1515 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1516 GNUNET_SCHEDULER_cancel (n->task);
1517 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1522 * Send a SESSION_CONNECT message via the given address.
1524 * @param na address to use
1527 send_session_connect (struct NeighbourAddress *na)
1529 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1530 struct SessionConnectMessage connect_msg;
1532 if (NULL == (papi = GST_plugins_find (na->address->transport_name)))
1537 if (NULL == na->session)
1538 na->session = papi->get_session (papi->cls, na->address);
1539 if (NULL == na->session)
1544 na->connect_timestamp = GNUNET_TIME_absolute_get ();
1545 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1546 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
1547 connect_msg.reserved = htonl (0);
1548 connect_msg.timestamp = GNUNET_TIME_absolute_hton (na->connect_timestamp);
1549 (void) papi->send (papi->cls,
1551 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1553 GNUNET_TIME_UNIT_FOREVER_REL,
1560 * Send a SESSION_CONNECT_ACK message via the given address.
1562 * @param address address to use
1563 * @param session session to use
1564 * @param timestamp timestamp to use for the ACK message
1567 send_session_connect_ack_message (const struct GNUNET_HELLO_Address *address,
1568 struct Session *session,
1569 struct GNUNET_TIME_Absolute timestamp)
1571 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1572 struct SessionConnectMessage connect_msg;
1574 if (NULL == (papi = GST_plugins_find (address->transport_name)))
1579 if (NULL == session)
1580 session = papi->get_session (papi->cls, address);
1581 if (NULL == session)
1586 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1587 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK);
1588 connect_msg.reserved = htonl (0);
1589 connect_msg.timestamp = GNUNET_TIME_absolute_hton (timestamp);
1590 (void) papi->send (papi->cls,
1592 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1594 GNUNET_TIME_UNIT_FOREVER_REL,
1601 * Create a fresh entry in the neighbour map for the given peer
1603 * @param peer peer to create an entry for
1604 * @return new neighbour map entry
1606 static struct NeighbourMapEntry *
1607 setup_neighbour (const struct GNUNET_PeerIdentity *peer)
1609 struct NeighbourMapEntry *n;
1611 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1612 "Creating new neighbour entry for `%s'\n",
1614 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
1616 n->state = S_NOT_CONNECTED;
1617 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
1618 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
1619 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
1620 MAX_BANDWIDTH_CARRY_S);
1621 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1622 GNUNET_assert (GNUNET_OK ==
1623 GNUNET_CONTAINER_multihashmap_put (neighbours,
1624 &n->id.hashPubKey, n,
1625 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1631 * Check if the two given addresses are the same.
1632 * Actually only checks if the sessions are non-NULL
1633 * (which they should be) and then if they are identical;
1634 * the actual addresses don't matter if the session
1635 * pointers match anyway, and we must have session pointers
1638 * @param a1 first address to compare
1639 * @param a2 other address to compare
1640 * @return GNUNET_NO if the addresses do not match, GNUNET_YES if they do match
1643 address_matches (const struct NeighbourAddress *a1,
1644 const struct NeighbourAddress *a2)
1646 if ( (NULL == a1->session) ||
1647 (NULL == a2->session) )
1652 return (a1->session == a2->session) ? GNUNET_YES : GNUNET_NO;
1657 * Try to create a connection to the given target (eventually).
1659 * @param target peer to try to connect to
1662 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
1664 struct NeighbourMapEntry *n;
1666 if (NULL == neighbours)
1667 return; /* during shutdown, do nothing */
1668 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1669 "Asked to connect to peer `%s'\n",
1670 GNUNET_i2s (target));
1672 memcmp (target, &GST_my_identity, sizeof (struct GNUNET_PeerIdentity)))
1674 /* refuse to connect to myself */
1675 /* FIXME: can this happen? Is this not an API violation? */
1676 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1677 "Refusing to try to connect to myself.\n");
1680 n = lookup_neighbour (target);
1685 case S_NOT_CONNECTED:
1686 /* this should not be possible */
1688 free_neighbour (n, GNUNET_NO);
1691 case S_INIT_BLACKLIST:
1692 case S_CONNECT_SENT:
1693 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1694 case S_CONNECT_RECV_ATS:
1695 case S_CONNECT_RECV_BLACKLIST:
1696 case S_CONNECT_RECV_ACK:
1697 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1698 "Ignoring request to try to connect to `%s', already trying!\n",
1699 GNUNET_i2s (target));
1700 return; /* already trying */
1702 case S_RECONNECT_ATS:
1703 case S_RECONNECT_BLACKLIST:
1704 case S_RECONNECT_SENT:
1705 case S_CONNECTED_SWITCHING_BLACKLIST:
1706 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1707 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1708 "Ignoring request to try to connect, already connected to `%s'!\n",
1709 GNUNET_i2s (target));
1710 return; /* already connected */
1712 /* get rid of remains, ready to re-try immediately */
1713 free_neighbour (n, GNUNET_NO);
1715 case S_DISCONNECT_FINISHED:
1716 /* should not be possible */
1719 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1721 free_neighbour (n, GNUNET_NO);
1725 n = setup_neighbour (target);
1726 n->state = S_INIT_ATS;
1727 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1729 GNUNET_ATS_reset_backoff (GST_ats, target);
1730 GNUNET_ATS_suggest_address (GST_ats, target);
1735 * Function called with the result of a blacklist check.
1737 * @param cls closure with the 'struct BlackListCheckContext'
1738 * @param peer peer this check affects
1739 * @param result GNUNET_OK if the address is allowed
1742 handle_test_blacklist_cont (void *cls,
1743 const struct GNUNET_PeerIdentity *peer,
1746 struct BlackListCheckContext *bcc = cls;
1747 struct NeighbourMapEntry *n;
1750 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1751 "Connection to new address of peer `%s' based on blacklist is `%s'\n",
1753 (GNUNET_OK == result) ? "allowed" : "FORBIDDEN");
1754 if (NULL == (n = lookup_neighbour (peer)))
1755 goto cleanup; /* nobody left to care about new address */
1758 case S_NOT_CONNECTED:
1759 /* this should not be possible */
1761 free_neighbour (n, GNUNET_NO);
1764 /* still waiting on ATS suggestion */
1766 case S_INIT_BLACKLIST:
1767 /* check if the address the blacklist was fine with matches
1768 ATS suggestion, if so, we can move on! */
1769 if ( (GNUNET_OK == result) &&
1770 (1 == n->send_connect_ack) )
1772 n->send_connect_ack = 2;
1773 send_session_connect_ack_message (bcc->na.address,
1775 n->connect_ack_timestamp);
1777 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1778 break; /* result for an address we currently don't care about */
1779 if (GNUNET_OK == result)
1781 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1782 n->state = S_CONNECT_SENT;
1783 send_session_connect (&n->primary_address);
1787 // FIXME: should also possibly destroy session with plugin!?
1788 GNUNET_ATS_address_destroyed (GST_ats,
1791 free_address (&n->primary_address);
1792 n->state = S_INIT_ATS;
1793 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1794 // FIXME: do we need to ask ATS again for suggestions?
1795 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1798 case S_CONNECT_SENT:
1799 /* waiting on CONNECT_ACK, send ACK if one is pending */
1800 if ( (GNUNET_OK == result) &&
1801 (1 == n->send_connect_ack) )
1803 n->send_connect_ack = 2;
1804 send_session_connect_ack_message (n->primary_address.address,
1805 n->primary_address.session,
1806 n->connect_ack_timestamp);
1809 case S_CONNECT_RECV_BLACKLIST_INBOUND:
1810 if (GNUNET_OK == result)
1812 /* valid new address, let ATS know! */
1813 GNUNET_ATS_address_add (GST_ats,
1816 bcc->ats, bcc->ats_count);
1818 n->state = S_CONNECT_RECV_ATS;
1819 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1820 GNUNET_ATS_reset_backoff (GST_ats, peer);
1821 GNUNET_ATS_suggest_address (GST_ats, peer);
1823 case S_CONNECT_RECV_ATS:
1824 /* still waiting on ATS suggestion, don't care about blacklist */
1826 case S_CONNECT_RECV_BLACKLIST:
1827 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1828 break; /* result for an address we currently don't care about */
1829 if (GNUNET_OK == result)
1831 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1832 n->state = S_CONNECT_RECV_ACK;
1833 send_session_connect_ack_message (bcc->na.address,
1835 n->connect_ack_timestamp);
1836 if (1 == n->send_connect_ack)
1837 n->send_connect_ack = 2;
1841 // FIXME: should also possibly destroy session with plugin!?
1842 GNUNET_ATS_address_destroyed (GST_ats,
1845 free_address (&n->primary_address);
1846 n->state = S_INIT_ATS;
1847 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1848 // FIXME: do we need to ask ATS again for suggestions?
1849 GNUNET_ATS_reset_backoff (GST_ats, peer);
1850 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1853 case S_CONNECT_RECV_ACK:
1854 /* waiting on SESSION_ACK, send ACK if one is pending */
1855 if ( (GNUNET_OK == result) &&
1856 (1 == n->send_connect_ack) )
1858 n->send_connect_ack = 2;
1859 send_session_connect_ack_message (n->primary_address.address,
1860 n->primary_address.session,
1861 n->connect_ack_timestamp);
1865 /* already connected, don't care about blacklist */
1867 case S_RECONNECT_ATS:
1868 /* still waiting on ATS suggestion, don't care about blacklist */
1870 case S_RECONNECT_BLACKLIST:
1871 if ( (GNUNET_OK == result) &&
1872 (1 == n->send_connect_ack) )
1874 n->send_connect_ack = 2;
1875 send_session_connect_ack_message (bcc->na.address,
1877 n->connect_ack_timestamp);
1879 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1880 break; /* result for an address we currently don't care about */
1881 if (GNUNET_OK == result)
1883 send_session_connect (&n->primary_address);
1884 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
1885 n->state = S_RECONNECT_SENT;
1889 GNUNET_ATS_address_destroyed (GST_ats,
1892 n->state = S_RECONNECT_ATS;
1893 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1894 // FIXME: do we need to ask ATS again for suggestions?
1895 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1898 case S_RECONNECT_SENT:
1899 /* waiting on CONNECT_ACK, don't care about blacklist */
1900 if ( (GNUNET_OK == result) &&
1901 (1 == n->send_connect_ack) )
1903 n->send_connect_ack = 2;
1904 send_session_connect_ack_message (n->primary_address.address,
1905 n->primary_address.session,
1906 n->connect_ack_timestamp);
1909 case S_CONNECTED_SWITCHING_BLACKLIST:
1910 if (GNUNET_YES != address_matches (&bcc->na, &n->alternative_address))
1911 break; /* result for an address we currently don't care about */
1912 if (GNUNET_OK == result)
1914 send_session_connect (&n->alternative_address);
1915 n->state = S_CONNECTED_SWITCHING_CONNECT_SENT;
1919 GNUNET_ATS_address_destroyed (GST_ats,
1922 free_address (&n->alternative_address);
1923 n->state = S_CONNECTED;
1926 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1927 /* waiting on CONNECT_ACK, don't care about blacklist */
1928 if ( (GNUNET_OK == result) &&
1929 (1 == n->send_connect_ack) )
1931 n->send_connect_ack = 2;
1932 send_session_connect_ack_message (n->primary_address.address,
1933 n->primary_address.session,
1934 n->connect_ack_timestamp);
1938 /* Nothing to do here, ATS will already do what can be done */
1940 case S_DISCONNECT_FINISHED:
1941 /* should not be possible */
1945 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
1947 free_neighbour (n, GNUNET_NO);
1951 GNUNET_HELLO_address_free (bcc->na.address);
1952 GNUNET_CONTAINER_DLL_remove (bc_head,
1960 * We want to know if connecting to a particular peer via
1961 * a particular address is allowed. Check it!
1963 * @param peer identity of the peer to switch the address for
1964 * @param ts time at which the check was initiated
1965 * @param address address of the other peer, NULL if other peer
1967 * @param session session to use (or NULL)
1968 * @param ats performance data
1969 * @param ats_count number of entries in ats (excluding 0-termination)
1972 check_blacklist (const struct GNUNET_PeerIdentity *peer,
1973 struct GNUNET_TIME_Absolute ts,
1974 const struct GNUNET_HELLO_Address *address,
1975 struct Session *session,
1976 const struct GNUNET_ATS_Information *ats,
1979 struct BlackListCheckContext *bcc;
1980 struct GST_BlacklistCheck *bc;
1983 GNUNET_malloc (sizeof (struct BlackListCheckContext) +
1984 sizeof (struct GNUNET_ATS_Information) * ats_count);
1985 bcc->ats_count = ats_count;
1986 bcc->na.address = GNUNET_HELLO_address_copy (address);
1987 bcc->na.session = session;
1988 bcc->na.connect_timestamp = ts;
1989 bcc->ats = (struct GNUNET_ATS_Information *) &bcc[1];
1990 memcpy (bcc->ats, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1991 GNUNET_CONTAINER_DLL_insert (bc_head,
1994 if (NULL != (bc = GST_blacklist_test_allowed (peer,
1995 address->transport_name,
1996 &handle_test_blacklist_cont, bcc)))
1998 /* if NULL == bc, 'cont' was already called and 'bcc' already free'd, so
1999 we must only store 'bc' if 'bc' is non-NULL... */
2004 * We received a 'SESSION_CONNECT' message from the other peer.
2005 * Consider switching to it.
2007 * @param message possibly a 'struct SessionConnectMessage' (check format)
2008 * @param peer identity of the peer to switch the address for
2009 * @param address address of the other peer, NULL if other peer
2011 * @param session session to use (or NULL)
2012 * @param ats performance data
2013 * @param ats_count number of entries in ats (excluding 0-termination)
2016 GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
2017 const struct GNUNET_PeerIdentity *peer,
2018 const struct GNUNET_HELLO_Address *address,
2019 struct Session *session,
2020 const struct GNUNET_ATS_Information *ats,
2023 const struct SessionConnectMessage *scm;
2024 struct NeighbourMapEntry *n;
2025 struct GNUNET_TIME_Absolute ts;
2027 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2028 "Received CONNECT message from peer `%s'\n",
2031 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2033 GNUNET_break_op (0);
2036 if (NULL == neighbours)
2037 return; /* we're shutting down */
2038 scm = (const struct SessionConnectMessage *) message;
2039 GNUNET_break_op (0 == ntohl (scm->reserved));
2040 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2041 n = lookup_neighbour (peer);
2043 n = setup_neighbour (peer);
2044 n->send_connect_ack = 1;
2045 n->connect_ack_timestamp = ts;
2049 case S_NOT_CONNECTED:
2050 n->state = S_CONNECT_RECV_BLACKLIST_INBOUND;
2051 /* Do a blacklist check for the new address */
2052 check_blacklist (peer, ts, address, session, ats, ats_count);
2055 /* CONNECT message takes priority over us asking ATS for address */
2056 n->state = S_CONNECT_RECV_BLACKLIST_INBOUND;
2058 case S_INIT_BLACKLIST:
2059 case S_CONNECT_SENT:
2060 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2061 case S_CONNECT_RECV_ATS:
2062 case S_CONNECT_RECV_BLACKLIST:
2063 case S_CONNECT_RECV_ACK:
2064 /* It can never hurt to have an alternative address in the above cases,
2065 see if it is allowed */
2066 check_blacklist (peer, ts, address, session, ats, ats_count);
2069 /* we are already connected and can thus send the ACK immediately;
2070 still, it can never hurt to have an alternative address, so also
2071 tell ATS about it */
2072 GNUNET_assert (NULL != n->primary_address.address);
2073 GNUNET_assert (NULL != n->primary_address.session);
2074 n->send_connect_ack = 0;
2075 send_session_connect_ack_message (n->primary_address.address,
2076 n->primary_address.session, ts);
2077 check_blacklist (peer, ts, address, session, ats, ats_count);
2079 case S_RECONNECT_ATS:
2080 case S_RECONNECT_BLACKLIST:
2081 case S_RECONNECT_SENT:
2082 /* It can never hurt to have an alternative address in the above cases,
2083 see if it is allowed */
2084 check_blacklist (peer, ts, address, session, ats, ats_count);
2086 case S_CONNECTED_SWITCHING_BLACKLIST:
2087 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2088 /* we are already connected and can thus send the ACK immediately;
2089 still, it can never hurt to have an alternative address, so also
2090 tell ATS about it */
2091 GNUNET_assert (NULL != n->primary_address.address);
2092 GNUNET_assert (NULL != n->primary_address.session);
2093 n->send_connect_ack = 0;
2094 send_session_connect_ack_message (n->primary_address.address,
2095 n->primary_address.session, ts);
2096 check_blacklist (peer, ts, address, session, ats, ats_count);
2099 /* get rid of remains without terminating sessions, ready to re-try */
2100 free_neighbour (n, GNUNET_YES);
2101 n = setup_neighbour (peer);
2102 n->state = S_CONNECT_RECV_ATS;
2103 GNUNET_ATS_reset_backoff (GST_ats, peer);
2104 GNUNET_ATS_suggest_address (GST_ats, peer);
2106 case S_DISCONNECT_FINISHED:
2107 /* should not be possible */
2111 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2113 free_neighbour (n, GNUNET_NO);
2120 * For an existing neighbour record, set the active connection to
2121 * use the given address.
2123 * @param peer identity of the peer to switch the address for
2124 * @param address address of the other peer, NULL if other peer
2126 * @param session session to use (or NULL)
2127 * @param ats performance data
2128 * @param ats_count number of entries in ats
2129 * @param bandwidth_in inbound quota to be used when connection is up
2130 * @param bandwidth_out outbound quota to be used when connection is up
2133 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
2134 const struct GNUNET_HELLO_Address *address,
2135 struct Session *session,
2136 const struct GNUNET_ATS_Information *ats,
2138 struct GNUNET_BANDWIDTH_Value32NBO
2140 struct GNUNET_BANDWIDTH_Value32NBO
2143 struct NeighbourMapEntry *n;
2144 struct GNUNET_TRANSPORT_PluginFunctions *papi;
2146 GNUNET_assert (address->transport_name != NULL);
2147 if (NULL == (n = lookup_neighbour (peer)))
2150 /* Obtain an session for this address from plugin */
2151 if (NULL == (papi = GST_plugins_find (address->transport_name)))
2153 /* we don't have the plugin for this address */
2154 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2157 if ((NULL == session) && (0 == address->address_length))
2160 if (strlen (address->transport_name) > 0)
2161 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2165 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2166 "ATS tells us to switch to address '%s' session %p for "
2167 "peer `%s' in state %s (quota in/out %u %u )\n",
2168 (address->address_length != 0) ? GST_plugins_a2s (address): "<inbound>",
2171 print_state (n->state),
2172 ntohl (bandwidth_in.value__),
2173 ntohl (bandwidth_out.value__));
2175 if (NULL == session)
2177 session = papi->get_session (papi->cls, address);
2178 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2179 "Obtained new session for peer `%s' and address '%s': %p\n",
2180 GNUNET_i2s (&address->peer), GST_plugins_a2s (address), session);
2182 if (NULL == session)
2184 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2185 "Failed to obtain new session for peer `%s' and address '%s'\n",
2186 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
2187 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2192 case S_NOT_CONNECTED:
2194 free_neighbour (n, GNUNET_NO);
2197 set_address (&n->primary_address,
2198 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2199 n->state = S_INIT_BLACKLIST;
2200 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2201 check_blacklist (&n->id,
2202 n->connect_ack_timestamp,
2203 address, session, ats, ats_count);
2205 case S_INIT_BLACKLIST:
2206 /* ATS suggests a different address, switch again */
2207 set_address (&n->primary_address,
2208 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2209 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2210 check_blacklist (&n->id,
2211 n->connect_ack_timestamp,
2212 address, session, ats, ats_count);
2214 case S_CONNECT_SENT:
2215 /* ATS suggests a different address, switch again */
2216 set_address (&n->primary_address,
2217 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2218 n->state = S_INIT_BLACKLIST;
2219 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2220 check_blacklist (&n->id,
2221 n->connect_ack_timestamp,
2222 address, session, ats, ats_count);
2224 case S_CONNECT_RECV_ATS:
2225 set_address (&n->primary_address,
2226 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2227 n->state = S_CONNECT_RECV_BLACKLIST;
2228 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2229 check_blacklist (&n->id,
2230 n->connect_ack_timestamp,
2231 address, session, ats, ats_count);
2233 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2234 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2235 check_blacklist (&n->id,
2236 n->connect_ack_timestamp,
2237 address, session, ats, ats_count);
2239 case S_CONNECT_RECV_BLACKLIST:
2240 case S_CONNECT_RECV_ACK:
2241 /* ATS asks us to switch while we were trying to connect; switch to new
2242 address and check blacklist again */
2243 set_address (&n->primary_address,
2244 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2245 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2246 check_blacklist (&n->id,
2247 n->connect_ack_timestamp,
2248 address, session, ats, ats_count);
2251 GNUNET_assert (NULL != n->primary_address.address);
2252 GNUNET_assert (NULL != n->primary_address.session);
2253 if (n->primary_address.session == session)
2255 /* not an address change, just a quota change */
2256 set_address (&n->primary_address,
2257 address, session, bandwidth_in, bandwidth_out, GNUNET_YES);
2260 /* ATS asks us to switch a life connection; see if we can get
2261 a CONNECT_ACK on it before we actually do this! */
2262 set_address (&n->alternative_address,
2263 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2264 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2265 check_blacklist (&n->id,
2266 GNUNET_TIME_absolute_get (),
2267 address, session, ats, ats_count);
2269 case S_RECONNECT_ATS:
2270 set_address (&n->primary_address,
2271 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2272 n->state = S_RECONNECT_BLACKLIST;
2273 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2274 check_blacklist (&n->id,
2275 n->connect_ack_timestamp,
2276 address, session, ats, ats_count);
2278 case S_RECONNECT_BLACKLIST:
2279 /* ATS asks us to switch while we were trying to reconnect; switch to new
2280 address and check blacklist again */
2281 set_address (&n->primary_address,
2282 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2283 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2284 check_blacklist (&n->id,
2285 n->connect_ack_timestamp,
2286 address, session, ats, ats_count);
2288 case S_RECONNECT_SENT:
2289 /* ATS asks us to switch while we were trying to reconnect; switch to new
2290 address and check blacklist again */
2291 set_address (&n->primary_address,
2292 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2293 n->state = S_RECONNECT_BLACKLIST;
2294 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2295 check_blacklist (&n->id,
2296 n->connect_ack_timestamp,
2297 address, session, ats, ats_count);
2299 case S_CONNECTED_SWITCHING_BLACKLIST:
2300 if (n->primary_address.session == session)
2302 /* ATS switches back to still-active session */
2303 free_address (&n->alternative_address);
2304 n->state = S_CONNECTED;
2307 /* ATS asks us to switch a life connection, update blacklist check */
2308 set_address (&n->alternative_address,
2309 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2310 check_blacklist (&n->id,
2311 GNUNET_TIME_absolute_get (),
2312 address, session, ats, ats_count);
2314 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2315 if (n->primary_address.session == session)
2317 /* ATS switches back to still-active session */
2318 free_address (&n->alternative_address);
2319 n->state = S_CONNECTED;
2322 /* ATS asks us to switch a life connection, update blacklist check */
2323 set_address (&n->alternative_address,
2324 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2325 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2326 check_blacklist (&n->id,
2327 GNUNET_TIME_absolute_get (),
2328 address, session, ats, ats_count);
2331 /* not going to switch addresses while disconnecting */
2333 case S_DISCONNECT_FINISHED:
2337 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2345 * Master task run for every neighbour. Performs all of the time-related
2346 * activities (keep alive, send next message, disconnect if idle, finish
2347 * clean up after disconnect).
2349 * @param cls the 'struct NeighbourMapEntry' for which we are running
2350 * @param tc scheduler context (unused)
2353 master_task (void *cls,
2354 const struct GNUNET_SCHEDULER_TaskContext *tc)
2356 struct NeighbourMapEntry *n = cls;
2357 struct GNUNET_TIME_Relative delay;
2359 n->task = GNUNET_SCHEDULER_NO_TASK;
2360 delay = GNUNET_TIME_absolute_get_remaining (n->timeout);
2361 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2362 "Master task runs for neighbour `%s' in state %s with timeout in %llu ms\n",
2363 GNUNET_i2s (&n->id),
2364 print_state(n->state),
2365 (unsigned long long) delay.rel_value);
2368 case S_NOT_CONNECTED:
2369 /* invalid state for master task, clean up */
2371 n->state = S_DISCONNECT_FINISHED;
2372 free_neighbour (n, GNUNET_NO);
2375 if (0 == delay.rel_value)
2377 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2378 "Connection to `%s' timed out waiting for ATS to provide address\n",
2379 GNUNET_i2s (&n->id));
2380 n->state = S_DISCONNECT_FINISHED;
2381 free_neighbour (n, GNUNET_NO);
2385 case S_INIT_BLACKLIST:
2386 if (0 == delay.rel_value)
2388 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2389 "Connection to `%s' timed out waiting for BLACKLIST to approve address\n",
2390 GNUNET_i2s (&n->id));
2391 n->state = S_DISCONNECT_FINISHED;
2392 free_neighbour (n, GNUNET_NO);
2396 case S_CONNECT_SENT:
2397 if (0 == delay.rel_value)
2399 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2400 "Connection to `%s' timed out waiting for other peer to send CONNECT_ACK\n",
2401 GNUNET_i2s (&n->id));
2402 disconnect_neighbour (n);
2406 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2407 if (0 == delay.rel_value)
2409 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2410 "Connection to `%s' timed out waiting BLACKLIST to approve address to use for received CONNECT\n",
2411 GNUNET_i2s (&n->id));
2412 n->state = S_DISCONNECT_FINISHED;
2413 free_neighbour (n, GNUNET_NO);
2417 case S_CONNECT_RECV_ATS:
2418 if (0 == delay.rel_value)
2420 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2421 "Connection to `%s' timed out waiting ATS to provide address to use for CONNECT_ACK\n",
2422 GNUNET_i2s (&n->id));
2423 n->state = S_DISCONNECT_FINISHED;
2424 free_neighbour (n, GNUNET_NO);
2428 case S_CONNECT_RECV_BLACKLIST:
2429 if (0 == delay.rel_value)
2431 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2432 "Connection to `%s' timed out waiting BLACKLIST to approve address to use for CONNECT_ACK\n",
2433 GNUNET_i2s (&n->id));
2434 n->state = S_DISCONNECT_FINISHED;
2435 free_neighbour (n, GNUNET_NO);
2439 case S_CONNECT_RECV_ACK:
2440 if (0 == delay.rel_value)
2442 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2443 "Connection to `%s' timed out waiting for other peer to send SESSION_ACK\n",
2444 GNUNET_i2s (&n->id));
2445 disconnect_neighbour (n);
2450 if (0 == delay.rel_value)
2452 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2453 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2454 GNUNET_i2s (&n->id));
2455 disconnect_neighbour (n);
2458 try_transmission_to_peer (n);
2461 case S_RECONNECT_ATS:
2462 if (0 == delay.rel_value)
2464 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2465 "Connection to `%s' timed out, waiting for ATS replacement address\n",
2466 GNUNET_i2s (&n->id));
2467 disconnect_neighbour (n);
2471 case S_RECONNECT_BLACKLIST:
2472 if (0 == delay.rel_value)
2474 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2475 "Connection to `%s' timed out, waiting for BLACKLIST to approve replacement address\n",
2476 GNUNET_i2s (&n->id));
2477 disconnect_neighbour (n);
2481 case S_RECONNECT_SENT:
2482 if (0 == delay.rel_value)
2484 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2485 "Connection to `%s' timed out, waiting for other peer to CONNECT_ACK replacement address\n",
2486 GNUNET_i2s (&n->id));
2487 disconnect_neighbour (n);
2491 case S_CONNECTED_SWITCHING_BLACKLIST:
2492 if (0 == delay.rel_value)
2494 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2495 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2496 GNUNET_i2s (&n->id));
2497 disconnect_neighbour (n);
2500 try_transmission_to_peer (n);
2503 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2504 if (0 == delay.rel_value)
2506 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2507 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs (after trying to CONNECT on alternative address)\n",
2508 GNUNET_i2s (&n->id));
2509 disconnect_neighbour (n);
2512 try_transmission_to_peer (n);
2516 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2517 "Cleaning up connection to `%s' after sending DISCONNECT\n",
2518 GNUNET_i2s (&n->id));
2519 free_neighbour (n, GNUNET_NO);
2521 case S_DISCONNECT_FINISHED:
2522 /* how did we get here!? */
2526 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2530 if ( (S_CONNECTED_SWITCHING_CONNECT_SENT == n->state) ||
2531 (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
2532 (S_CONNECTED == n->state) )
2534 /* if we are *now* in one of these three states, we're sending
2535 keep alive messages, so we need to consider the keepalive
2536 delay, not just the connection timeout */
2537 delay = GNUNET_TIME_relative_min (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time),
2540 if (GNUNET_SCHEDULER_NO_TASK == n->task)
2541 n->task = GNUNET_SCHEDULER_add_delayed (delay,
2548 * Send a SESSION_ACK message to the neighbour to confirm that we
2549 * got his CONNECT_ACK.
2551 * @param n neighbour to send the SESSION_ACK to
2554 send_session_ack_message (struct NeighbourMapEntry *n)
2556 struct GNUNET_MessageHeader msg;
2558 msg.size = htons (sizeof (struct GNUNET_MessageHeader));
2559 msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK);
2560 (void) send_with_session(n,
2561 (const char *) &msg, sizeof (struct GNUNET_MessageHeader),
2562 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
2568 * We received a 'SESSION_CONNECT_ACK' message from the other peer.
2569 * Consider switching to it.
2571 * @param message possibly a 'struct SessionConnectMessage' (check format)
2572 * @param peer identity of the peer to switch the address for
2573 * @param address address of the other peer, NULL if other peer
2575 * @param session session to use (or NULL)
2576 * @param ats performance data
2577 * @param ats_count number of entries in ats
2580 GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
2581 const struct GNUNET_PeerIdentity *peer,
2582 const struct GNUNET_HELLO_Address *address,
2583 struct Session *session,
2584 const struct GNUNET_ATS_Information *ats,
2587 const struct SessionConnectMessage *scm;
2588 struct GNUNET_TIME_Absolute ts;
2589 struct NeighbourMapEntry *n;
2591 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2592 "Received CONNECT_ACK message from peer `%s'\n",
2595 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2597 GNUNET_break_op (0);
2600 scm = (const struct SessionConnectMessage *) message;
2601 GNUNET_break_op (ntohl (scm->reserved) == 0);
2602 if (NULL == (n = lookup_neighbour (peer)))
2604 GNUNET_STATISTICS_update (GST_stats,
2606 ("# unexpected CONNECT_ACK messages (no peer)"),
2610 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2613 case S_NOT_CONNECTED:
2615 free_neighbour (n, GNUNET_NO);
2618 case S_INIT_BLACKLIST:
2619 GNUNET_STATISTICS_update (GST_stats,
2621 ("# unexpected CONNECT_ACK messages (not ready)"),
2624 case S_CONNECT_SENT:
2625 if (ts.abs_value != n->primary_address.connect_timestamp.abs_value)
2626 break; /* ACK does not match our original CONNECT message */
2627 n->state = S_CONNECTED;
2628 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2629 GNUNET_STATISTICS_set (GST_stats,
2630 gettext_noop ("# peers connected"),
2631 ++neighbours_connected,
2633 connect_notify_cb (callback_cls, &n->id, ats, ats_count,
2634 n->primary_address.bandwidth_in,
2635 n->primary_address.bandwidth_out);
2636 /* Tell ATS that the outbound session we created to send CONNECT was successfull */
2637 GNUNET_ATS_address_add (GST_ats,
2638 n->primary_address.address,
2639 n->primary_address.session,
2641 set_address (&n->primary_address,
2642 n->primary_address.address,
2643 n->primary_address.session,
2644 n->primary_address.bandwidth_in,
2645 n->primary_address.bandwidth_out,
2647 send_session_ack_message (n);
2649 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2650 case S_CONNECT_RECV_ATS:
2651 case S_CONNECT_RECV_BLACKLIST:
2652 case S_CONNECT_RECV_ACK:
2653 GNUNET_STATISTICS_update (GST_stats,
2655 ("# unexpected CONNECT_ACK messages (not ready)"),
2659 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2660 send_session_ack_message (n);
2662 case S_RECONNECT_ATS:
2663 case S_RECONNECT_BLACKLIST:
2664 /* we didn't expect any CONNECT_ACK, as we are waiting for ATS
2665 to give us a new address... */
2666 GNUNET_STATISTICS_update (GST_stats,
2668 ("# unexpected CONNECT_ACK messages (waiting on ATS)"),
2671 case S_RECONNECT_SENT:
2672 /* new address worked; go back to connected! */
2673 n->state = S_CONNECTED;
2674 send_session_ack_message (n);
2676 case S_CONNECTED_SWITCHING_BLACKLIST:
2677 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2678 send_session_ack_message (n);
2680 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2681 /* new address worked; adopt it and go back to connected! */
2682 n->state = S_CONNECTED;
2683 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2684 GNUNET_break (GNUNET_NO == n->alternative_address.ats_active);
2685 GNUNET_ATS_address_add(GST_ats,
2686 n->alternative_address.address,
2687 n->alternative_address.session,
2689 set_address (&n->primary_address,
2690 n->alternative_address.address,
2691 n->alternative_address.session,
2692 n->alternative_address.bandwidth_in,
2693 n->alternative_address.bandwidth_out,
2695 free_address (&n->alternative_address);
2696 send_session_ack_message (n);
2699 GNUNET_STATISTICS_update (GST_stats,
2701 ("# unexpected CONNECT_ACK messages (disconnecting)"),
2704 case S_DISCONNECT_FINISHED:
2708 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2716 * A session was terminated. Take note; if needed, try to get
2717 * an alternative address from ATS.
2719 * @param peer identity of the peer where the session died
2720 * @param session session that is gone
2721 * @return GNUNET_YES if this was a session used, GNUNET_NO if
2722 * this session was not in use
2725 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
2726 struct Session *session)
2728 struct NeighbourMapEntry *n;
2729 struct BlackListCheckContext *bcc;
2730 struct BlackListCheckContext *bcc_next;
2732 /* make sure to cancel all ongoing blacklist checks involving 'session' */
2734 while (NULL != (bcc = bcc_next))
2736 bcc_next = bcc->next;
2737 if (bcc->na.session == session)
2739 GST_blacklist_test_cancel (bcc->bc);
2740 GNUNET_HELLO_address_free (bcc->na.address);
2741 GNUNET_CONTAINER_DLL_remove (bc_head,
2747 if (NULL == (n = lookup_neighbour (peer)))
2748 return GNUNET_NO; /* can't affect us */
2749 if (session != n->primary_address.session)
2751 if (session == n->alternative_address.session)
2753 free_address (&n->alternative_address);
2754 if ( (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
2755 (S_CONNECTED_SWITCHING_CONNECT_SENT == n->state) )
2756 n->state = S_CONNECTED;
2760 return GNUNET_NO; /* doesn't affect us further */
2763 n->expect_latency_response = GNUNET_NO;
2766 case S_NOT_CONNECTED:
2768 free_neighbour (n, GNUNET_NO);
2772 free_neighbour (n, GNUNET_NO);
2774 case S_INIT_BLACKLIST:
2775 case S_CONNECT_SENT:
2776 free_address (&n->primary_address);
2777 n->state = S_INIT_ATS;
2778 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2779 // FIXME: need to ask ATS for suggestions again?
2780 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2782 case S_CONNECT_RECV_BLACKLIST_INBOUND:
2783 case S_CONNECT_RECV_ATS:
2784 case S_CONNECT_RECV_BLACKLIST:
2785 case S_CONNECT_RECV_ACK:
2786 /* error on inbound session; free neighbour entirely */
2787 free_address (&n->primary_address);
2788 free_neighbour (n, GNUNET_NO);
2791 free_address (&n->primary_address);
2792 n->state = S_RECONNECT_ATS;
2793 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2794 /* FIXME: is this ATS call needed? */
2795 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2797 case S_RECONNECT_ATS:
2798 /* we don't have an address, how can it go down? */
2801 case S_RECONNECT_BLACKLIST:
2802 case S_RECONNECT_SENT:
2803 n->state = S_RECONNECT_ATS;
2804 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2805 // FIXME: need to ask ATS for suggestions again?
2806 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2808 case S_CONNECTED_SWITCHING_BLACKLIST:
2809 /* primary went down while we were checking secondary against
2810 blacklist, adopt secondary as primary */
2811 free_address (&n->primary_address);
2812 n->primary_address = n->alternative_address;
2813 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2814 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2815 n->state = S_RECONNECT_BLACKLIST;
2817 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2818 /* primary went down while we were waiting for CONNECT_ACK on secondary;
2819 secondary as primary */
2820 free_address (&n->primary_address);
2821 n->primary_address = n->alternative_address;
2822 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2823 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2824 n->state = S_RECONNECT_SENT;
2827 free_address (&n->primary_address);
2829 case S_DISCONNECT_FINISHED:
2830 /* neighbour was freed and plugins told to terminate session */
2834 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
2838 if (GNUNET_SCHEDULER_NO_TASK != n->task)
2839 GNUNET_SCHEDULER_cancel (n->task);
2840 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
2846 * We received a 'SESSION_ACK' message from the other peer.
2847 * If we sent a 'CONNECT_ACK' last, this means we are now
2848 * connected. Otherwise, do nothing.
2850 * @param message possibly a 'struct SessionConnectMessage' (check format)
2851 * @param peer identity of the peer to switch the address for
2852 * @param address address of the other peer, NULL if other peer
2854 * @param session session to use (or NULL)
2855 * @param ats performance data
2856 * @param ats_count number of entries in ats
2859 GST_neighbours_handle_session_ack (const struct GNUNET_MessageHeader *message,
2860 const struct GNUNET_PeerIdentity *peer,
2861 const struct GNUNET_HELLO_Address *address,
2862 struct Session *session,
2863 const struct GNUNET_ATS_Information *ats,
2866 struct NeighbourMapEntry *n;
2868 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2869 "Received SESSION_ACK message from peer `%s'\n",
2871 if (ntohs (message->size) != sizeof (struct GNUNET_MessageHeader))
2873 GNUNET_break_op (0);
2876 if (NULL == (n = lookup_neighbour (peer)))
2878 /* check if we are in a plausible state for having sent
2879 a CONNECT_ACK. If not, return, otherwise break */
2880 if ( ( (S_CONNECT_RECV_ACK != n->state) &&
2881 (S_CONNECT_SENT != n->state) ) ||
2882 (2 != n->send_connect_ack) )
2884 GNUNET_STATISTICS_update (GST_stats,
2885 gettext_noop ("# unexpected SESSION ACK messages"), 1,
2889 n->state = S_CONNECTED;
2890 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2891 GNUNET_STATISTICS_set (GST_stats,
2892 gettext_noop ("# peers connected"),
2893 ++neighbours_connected,
2895 connect_notify_cb (callback_cls, &n->id, ats, ats_count,
2896 n->primary_address.bandwidth_in,
2897 n->primary_address.bandwidth_out);
2898 GNUNET_ATS_address_add(GST_ats,
2899 n->primary_address.address,
2900 n->primary_address.session,
2902 set_address (&n->primary_address,
2903 n->primary_address.address,
2904 n->primary_address.session,
2905 n->primary_address.bandwidth_in,
2906 n->primary_address.bandwidth_out,
2912 * Test if we're connected to the given peer.
2914 * @param target peer to test
2915 * @return GNUNET_YES if we are connected, GNUNET_NO if not
2918 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
2920 return test_connected (lookup_neighbour (target));
2925 * Change the incoming quota for the given peer.
2927 * @param neighbour identity of peer to change qutoa for
2928 * @param quota new quota
2931 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
2932 struct GNUNET_BANDWIDTH_Value32NBO quota)
2934 struct NeighbourMapEntry *n;
2936 if (NULL == (n = lookup_neighbour (neighbour)))
2938 GNUNET_STATISTICS_update (GST_stats,
2940 ("# SET QUOTA messages ignored (no such peer)"),
2944 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2945 "Setting inbound quota of %u Bps for peer `%s' to all clients\n",
2946 ntohl (quota.value__), GNUNET_i2s (&n->id));
2947 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
2948 if (0 != ntohl (quota.value__))
2950 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
2951 GNUNET_i2s (&n->id), "SET_QUOTA");
2952 if (GNUNET_YES == test_connected (n))
2953 GNUNET_STATISTICS_update (GST_stats,
2954 gettext_noop ("# disconnects due to quota of 0"),
2956 disconnect_neighbour (n);
2961 * We received a disconnect message from the given peer,
2962 * validate and process.
2964 * @param peer sender of the message
2965 * @param msg the disconnect message
2968 GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity
2970 const struct GNUNET_MessageHeader
2973 struct NeighbourMapEntry *n;
2974 const struct SessionDisconnectMessage *sdm;
2975 struct GNUNET_HashCode hc;
2977 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2978 "Received DISCONNECT message from peer `%s'\n",
2980 if (ntohs (msg->size) != sizeof (struct SessionDisconnectMessage))
2982 // GNUNET_break_op (0);
2983 GNUNET_STATISTICS_update (GST_stats,
2985 ("# disconnect messages ignored (old format)"), 1,
2989 sdm = (const struct SessionDisconnectMessage *) msg;
2990 if (NULL == (n = lookup_neighbour (peer)))
2991 return; /* gone already */
2992 if (GNUNET_TIME_absolute_ntoh (sdm->timestamp).abs_value <= n->connect_ack_timestamp.abs_value)
2994 GNUNET_STATISTICS_update (GST_stats,
2996 ("# disconnect messages ignored (timestamp)"), 1,
3000 GNUNET_CRYPTO_hash (&sdm->public_key,
3001 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3003 if (0 != memcmp (peer, &hc, sizeof (struct GNUNET_PeerIdentity)))
3005 GNUNET_break_op (0);
3008 if (ntohl (sdm->purpose.size) !=
3009 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3010 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
3011 sizeof (struct GNUNET_TIME_AbsoluteNBO))
3013 GNUNET_break_op (0);
3017 GNUNET_CRYPTO_rsa_verify
3018 (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT, &sdm->purpose,
3019 &sdm->signature, &sdm->public_key))
3021 GNUNET_break_op (0);
3024 if (GNUNET_YES == test_connected (n))
3025 GNUNET_STATISTICS_update (GST_stats,
3027 ("# other peer asked to disconnect from us"), 1,
3029 disconnect_neighbour (n);
3034 * Closure for the neighbours_iterate function.
3036 struct IteratorContext
3039 * Function to call on each connected neighbour.
3041 GST_NeighbourIterator cb;
3051 * Call the callback from the closure for each connected neighbour.
3053 * @param cls the 'struct IteratorContext'
3054 * @param key the hash of the public key of the neighbour
3055 * @param value the 'struct NeighbourMapEntry'
3056 * @return GNUNET_OK (continue to iterate)
3059 neighbours_iterate (void *cls, const struct GNUNET_HashCode * key, void *value)
3061 struct IteratorContext *ic = cls;
3062 struct NeighbourMapEntry *n = value;
3064 if (GNUNET_YES == test_connected (n))
3066 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in;
3067 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out;
3069 if (NULL != n->primary_address.address)
3071 bandwidth_in = n->primary_address.bandwidth_in;
3072 bandwidth_out = n->primary_address.bandwidth_out;
3076 bandwidth_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
3077 bandwidth_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
3080 ic->cb (ic->cb_cls, &n->id, NULL, 0,
3081 n->primary_address.address,
3082 bandwidth_in, bandwidth_out);
3089 * Iterate over all connected neighbours.
3091 * @param cb function to call
3092 * @param cb_cls closure for cb
3095 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
3097 struct IteratorContext ic;
3099 if (NULL == neighbours)
3100 return; /* can happen during shutdown */
3103 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
3108 * If we have an active connection to the given target, it must be shutdown.
3110 * @param target peer to disconnect from
3113 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
3115 struct NeighbourMapEntry *n;
3117 if (NULL == (n = lookup_neighbour (target)))
3118 return; /* not active */
3119 if (GNUNET_YES == test_connected (n))
3120 GNUNET_STATISTICS_update (GST_stats,
3122 ("# disconnected from peer upon explicit request"), 1,
3124 disconnect_neighbour (n);
3129 * Obtain current latency information for the given neighbour.
3131 * @param peer to get the latency for
3132 * @return observed latency of the address, FOREVER if the
3133 * the connection is not up
3135 struct GNUNET_TIME_Relative
3136 GST_neighbour_get_latency (const struct GNUNET_PeerIdentity *peer)
3138 struct NeighbourMapEntry *n;
3140 n = lookup_neighbour (peer);
3142 return GNUNET_TIME_UNIT_FOREVER_REL;
3146 case S_CONNECTED_SWITCHING_CONNECT_SENT:
3147 case S_CONNECTED_SWITCHING_BLACKLIST:
3148 case S_RECONNECT_SENT:
3149 case S_RECONNECT_ATS:
3150 case S_RECONNECT_BLACKLIST:
3152 case S_NOT_CONNECTED:
3153 case S_INIT_BLACKLIST:
3155 case S_CONNECT_RECV_BLACKLIST_INBOUND:
3156 case S_CONNECT_RECV_ATS:
3157 case S_CONNECT_RECV_BLACKLIST:
3158 case S_CONNECT_RECV_ACK:
3159 case S_CONNECT_SENT:
3161 case S_DISCONNECT_FINISHED:
3162 return GNUNET_TIME_UNIT_FOREVER_REL;
3164 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Unhandled state `%s' \n",print_state (n->state));
3168 return GNUNET_TIME_UNIT_FOREVER_REL;
3173 * Obtain current address information for the given neighbour.
3176 * @return address currently used
3178 struct GNUNET_HELLO_Address *
3179 GST_neighbour_get_current_address (const struct GNUNET_PeerIdentity *peer)
3181 struct NeighbourMapEntry *n;
3183 n = lookup_neighbour (peer);
3186 return n->primary_address.address;
3191 * Initialize the neighbours subsystem.
3193 * @param cls closure for callbacks
3194 * @param connect_cb function to call if we connect to a peer
3195 * @param disconnect_cb function to call if we disconnect from a peer
3196 * @param peer_address_cb function to call if we change an active address
3200 GST_neighbours_start (void *cls,
3201 NotifyConnect connect_cb,
3202 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb,
3203 GNUNET_TRANSPORT_PeerIterateCallback peer_address_cb)
3206 connect_notify_cb = connect_cb;
3207 disconnect_notify_cb = disconnect_cb;
3208 address_change_cb = peer_address_cb;
3209 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE, GNUNET_NO);
3214 * Disconnect from the given neighbour.
3217 * @param key hash of neighbour's public key (not used)
3218 * @param value the 'struct NeighbourMapEntry' of the neighbour
3219 * @return GNUNET_OK (continue to iterate)
3222 disconnect_all_neighbours (void *cls, const struct GNUNET_HashCode * key, void *value)
3224 struct NeighbourMapEntry *n = value;
3226 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3227 "Disconnecting peer `%4s', %s\n",
3228 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
3229 n->state = S_DISCONNECT_FINISHED;
3230 free_neighbour (n, GNUNET_NO);
3236 * Cleanup the neighbours subsystem.
3239 GST_neighbours_stop ()
3241 if (NULL == neighbours)
3243 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
3244 &disconnect_all_neighbours,
3246 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
3248 callback_cls = NULL;
3249 connect_notify_cb = NULL;
3250 disconnect_notify_cb = NULL;
3251 address_change_cb = NULL;
3255 /* end of file gnunet-service-transport_neighbours.c */