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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"
44 * Size of the neighbour hash map.
46 #define NEIGHBOUR_TABLE_SIZE 256
49 * Time we give plugin to transmit DISCONNECT message before the
50 * neighbour entry self-destructs.
52 #define DISCONNECT_SENT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 100)
55 * How often must a peer violate bandwidth quotas before we start
56 * to simply drop its messages?
58 #define QUOTA_VIOLATION_DROP_THRESHOLD 10
61 * How often do we send KEEPALIVE messages to each of our neighbours and measure
62 * the latency with this neighbour?
63 * (idle timeout is 5 minutes or 300 seconds, so with 30s interval we
64 * send 10 keepalives in each interval, so 10 messages would need to be
65 * lost in a row for a disconnect).
67 #define KEEPALIVE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
70 * How long are we willing to wait for a response from ATS before timing out?
72 #define ATS_RESPONSE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 500)
75 * How long are we willing to wait for an ACK from the other peer before
76 * giving up on our connect operation?
78 #define SETUP_CONNECTION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
81 * How long are we willing to wait for a successful reconnect if
82 * an existing connection went down? Much shorter than the
83 * usual SETUP_CONNECTION_TIMEOUT as we do not inform the
84 * higher layers about the disconnect during this period.
86 #define FAST_RECONNECT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
89 * How long are we willing to wait for a response from the blacklist
90 * subsystem before timing out?
92 #define BLACKLIST_RESPONSE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 500)
95 GNUNET_NETWORK_STRUCT_BEGIN
98 * Message a peer sends to another to indicate that it intends to
99 * setup a connection/session for data exchange. A 'SESSION_CONNECT'
100 * should be answered with a 'SESSION_CONNECT_ACK' with the same body
101 * to confirm. A 'SESSION_CONNECT_ACK' should then be followed with
102 * a 'SESSION_ACK'. Once the 'SESSION_ACK' is received, both peers
103 * should be connected.
105 struct SessionConnectMessage
108 * Header of type 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT'
109 * or 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK'
111 struct GNUNET_MessageHeader header;
116 uint32_t reserved GNUNET_PACKED;
119 * Absolute time at the sender. Only the most recent connect
120 * message implies which session is preferred by the sender.
122 struct GNUNET_TIME_AbsoluteNBO timestamp;
128 * Message we send to the other peer to notify him that we intentionally
129 * are disconnecting (to reduce timeouts). This is just a friendly
130 * notification, peers must not rely on always receiving disconnect
133 struct SessionDisconnectMessage
136 * Header of type 'GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT'
138 struct GNUNET_MessageHeader header;
143 uint32_t reserved GNUNET_PACKED;
146 * Purpose of the signature. Extends over the timestamp.
147 * Purpose should be GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DISCONNECT.
149 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
152 * Absolute time at the sender. Only the most recent connect
153 * message implies which session is preferred by the sender.
155 struct GNUNET_TIME_AbsoluteNBO timestamp;
158 * Public key of the sender.
160 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
163 * Signature of the peer that sends us the disconnect. Only
164 * valid if the timestamp is AFTER the timestamp from the
165 * corresponding 'CONNECT' message.
167 struct GNUNET_CRYPTO_RsaSignature signature;
171 GNUNET_NETWORK_STRUCT_END
175 * For each neighbour we keep a list of messages
176 * that we still want to transmit to the neighbour.
182 * This is a doubly linked list.
184 struct MessageQueue *next;
187 * This is a doubly linked list.
189 struct MessageQueue *prev;
192 * Function to call once we're done.
194 GST_NeighbourSendContinuation cont;
202 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
203 * stuck together in memory. Allocated at the end of this struct.
205 const char *message_buf;
208 * Size of the message buf
210 size_t message_buf_size;
213 * At what time should we fail?
215 struct GNUNET_TIME_Absolute timeout;
221 * Possible state of a neighbour. Initially, we are S_NOT_CONNECTED.
223 * Then, there are two main paths. If we receive a CONNECT message, we
224 * first run a check against the blacklist and ask ATS for a
225 * suggestion. (S_CONNECT_RECV_ATS). If the blacklist comes back
226 * positive, we give the address to ATS. If ATS makes a suggestion,
227 * we ALSO give that suggestion to the blacklist
228 * (S_CONNECT_RECV_BLACKLIST). Once the blacklist approves the
229 * address we got from ATS, we send our CONNECT_ACK and go to
230 * S_CONNECT_RECV_ACK. If we receive a SESSION_ACK, we go to
231 * S_CONNECTED (and notify everyone about the new connection). If the
232 * operation times out, we go to S_DISCONNECT.
234 * The other case is where we transmit a CONNECT message first. We
235 * start with S_INIT_ATS. If we get an address, we enter
236 * S_INIT_BLACKLIST and check the blacklist. If the blacklist is OK
237 * with the connection, we actually send the CONNECT message and go to
238 * state S_CONNECT_SENT. Once we receive a CONNECT_ACK, we go to
239 * S_CONNECTED (and notify everyone about the new connection and send
240 * back a SESSION_ACK). If the operation times out, we go to
243 * If the session is in trouble (i.e. transport-level disconnect or
244 * timeout), we go to S_RECONNECT_ATS where we ask ATS for a new
245 * address (we don't notify anyone about the disconnect yet). Once we
246 * have a new address, we go to S_RECONNECT_BLACKLIST to check the new
247 * address against the blacklist. If the blacklist approves, we enter
248 * S_RECONNECT_SENT and send a CONNECT message. If we receive a
249 * CONNECT_ACK, we go to S_CONNECTED and nobody noticed that we had
250 * trouble; we also send a SESSION_ACK at this time just in case. If
251 * the operation times out, we go to S_DISCONNECT (and notify everyone
252 * about the lost connection).
254 * If ATS decides to switch addresses while we have a normal
255 * connection, we go to S_CONNECTED_SWITCHING_BLACKLIST to check the
256 * new address against the blacklist. If the blacklist approves, we
257 * go to S_CONNECTED_SWITCHING_CONNECT_SENT and send a
258 * SESSION_CONNECT. If we get a SESSION_ACK back, we switch the
259 * primary connection to the suggested alternative from ATS, go back
260 * to S_CONNECTED and send a SESSION_ACK to the other peer just to be
261 * sure. If the operation times out (or the blacklist disapproves),
262 * we go to S_CONNECTED (and notify ATS that the given alternative
263 * address is "invalid").
265 * Once a session is in S_DISCONNECT, it is cleaned up and then goes
266 * to (S_DISCONNECT_FINISHED). If we receive an explicit disconnect
267 * request, we can go from any state to S_DISCONNECT, possibly after
268 * generating disconnect notifications.
270 * Note that it is quite possible that while we are in any of these
271 * states, we could receive a 'CONNECT' request from the other peer.
272 * We then enter a 'weird' state where we pursue our own primary state
273 * machine (as described above), but with the 'send_connect_ack' flag
274 * set to 1. If our state machine allows us to send a 'CONNECT_ACK'
275 * (because we have an acceptable address), we send the 'CONNECT_ACK'
276 * and set the 'send_connect_ack' to 2. If we then receive a
277 * 'SESSION_ACK', we go to 'S_CONNECTED' (and reset 'send_connect_ack'
284 * fresh peer or completely disconnected
289 * Asked to initiate connection, trying to get address from ATS
294 * Asked to initiate connection, trying to get address approved
300 * Sent CONNECT message to other peer, waiting for CONNECT_ACK
305 * Received a CONNECT, asking ATS about address suggestions.
310 * Received CONNECT from other peer, got an address, checking with blacklist.
312 S_CONNECT_RECV_BLACKLIST,
315 * CONNECT request from other peer was SESSION_ACK'ed, waiting for
321 * Got our CONNECT_ACK/SESSION_ACK, connection is up.
326 * Connection got into trouble, rest of the system still believes
327 * it to be up, but we're getting a new address from ATS.
332 * Connection got into trouble, rest of the system still believes
333 * it to be up; we are checking the new address against the blacklist.
335 S_RECONNECT_BLACKLIST,
338 * Sent CONNECT over new address (either by ATS telling us to switch
339 * addresses or from RECONNECT_ATS); if this fails, we need to tell
340 * the rest of the system about a disconnect.
345 * We have some primary connection, but ATS suggested we switch
346 * to some alternative; we're now checking the alternative against
349 S_CONNECTED_SWITCHING_BLACKLIST,
352 * We have some primary connection, but ATS suggested we switch
353 * to some alternative; we now sent a CONNECT message for the
354 * alternative session to the other peer and waiting for a
355 * CONNECT_ACK to make this our primary connection.
357 S_CONNECTED_SWITCHING_CONNECT_SENT,
360 * Disconnect in progress (we're sending the DISCONNECT message to the
361 * other peer; after that is finished, the state will be cleaned up).
366 * We're finished with the disconnect; clean up state now!
368 S_DISCONNECT_FINISHED
373 * A possible address we could use to communicate with a neighbour.
375 struct NeighbourAddress
379 * Active session for this address.
381 struct Session *session;
384 * Network-level address information.
386 struct GNUNET_HELLO_Address *address;
389 * Timestamp of the 'SESSION_CONNECT' message we sent to the other
390 * peer for this address. Use to check that the ACK is in response
391 * to our most recent 'CONNECT'.
393 struct GNUNET_TIME_Absolute connect_timestamp;
396 * Inbound bandwidth from ATS for this address.
398 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in;
401 * Outbound bandwidth from ATS for this address.
403 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out;
406 * Did we tell ATS that this is our 'active' address?
414 * Entry in neighbours.
416 struct NeighbourMapEntry
420 * Head of list of messages we would like to send to this peer;
421 * must contain at most one message per client.
423 struct MessageQueue *messages_head;
426 * Tail of list of messages we would like to send to this peer; must
427 * contain at most one message per client.
429 struct MessageQueue *messages_tail;
432 * Are we currently trying to send a message? If so, which one?
434 struct MessageQueue *is_active;
437 * Primary address we currently use to communicate with the neighbour.
439 struct NeighbourAddress primary_address;
442 * Alternative address currently under consideration for communicating
443 * with the neighbour.
445 struct NeighbourAddress alternative_address;
448 * Identity of this neighbour.
450 struct GNUNET_PeerIdentity id;
453 * Main task that drives this peer (timeouts, keepalives, etc.).
454 * Always runs the 'master_task'.
456 GNUNET_SCHEDULER_TaskIdentifier task;
459 * At what time should we sent the next keep-alive message?
461 struct GNUNET_TIME_Absolute keep_alive_time;
464 * At what time did we sent the last keep-alive message? Used
465 * to calculate round-trip time ("latency").
467 struct GNUNET_TIME_Absolute last_keep_alive_time;
470 * Timestamp we should include in our next CONNECT_ACK message.
471 * (only valid if 'send_connect_ack' is GNUNET_YES). Used to build
472 * our CONNECT_ACK message.
474 struct GNUNET_TIME_Absolute connect_ack_timestamp;
477 * Time where we should cut the connection (timeout) if we don't
478 * make progress in the state machine (or get a KEEPALIVE_RESPONSE
479 * if we are in S_CONNECTED).
481 struct GNUNET_TIME_Absolute timeout;
484 * Latest calculated latency value
486 struct GNUNET_TIME_Relative latency;
489 * Tracker for inbound bandwidth.
491 struct GNUNET_BANDWIDTH_Tracker in_tracker;
494 * How often has the other peer (recently) violated the inbound
495 * traffic limit? Incremented by 10 per violation, decremented by 1
496 * per non-violation (for each time interval).
498 unsigned int quota_violation_count;
501 * The current state of the peer.
506 * Did we sent an KEEP_ALIVE message and are we expecting a response?
508 int expect_latency_response;
511 * Flag to set if we still need to send a CONNECT_ACK message to the other peer
512 * (once we have an address to use and the peer has been allowed by our
513 * blacklist). Set to 1 if we need to send a CONNECT_ACK. Set to 2 if we
514 * did send a CONNECT_ACK and should go to 'S_CONNECTED' upon receiving
515 * a 'SESSION_ACK' (regardless of what our own state machine might say).
517 int send_connect_ack;
523 * Context for blacklist checks and the 'handle_test_blacklist_cont'
524 * function. Stores information about ongoing blacklist checks.
526 struct BlackListCheckContext
530 * We keep blacklist checks in a DLL.
532 struct BlackListCheckContext *next;
535 * We keep blacklist checks in a DLL.
537 struct BlackListCheckContext *prev;
540 * Address that is being checked.
542 struct NeighbourAddress na;
545 * ATS information about the address.
547 struct GNUNET_ATS_Information *ats;
550 * Handle to the ongoing blacklist check.
552 struct GST_BlacklistCheck *bc;
555 * Size of the 'ats' array.
563 * Hash map from peer identities to the respective 'struct NeighbourMapEntry'.
565 static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
568 * We keep blacklist checks in a DLL so that we can find
569 * the 'sessions' in their 'struct NeighbourAddress' if
570 * a session goes down.
572 static struct BlackListCheckContext *bc_head;
575 * We keep blacklist checks in a DLL.
577 static struct BlackListCheckContext *bc_tail;
580 * Closure for connect_notify_cb, disconnect_notify_cb and address_change_cb
582 static void *callback_cls;
585 * Function to call when we connected to a neighbour.
587 static GNUNET_TRANSPORT_NotifyConnect connect_notify_cb;
590 * Function to call when we disconnected from a neighbour.
592 static GNUNET_TRANSPORT_NotifyDisconnect disconnect_notify_cb;
595 * Function to call when we changed an active address of a neighbour.
597 static GNUNET_TRANSPORT_PeerIterateCallback address_change_cb;
600 * counter for connected neighbours
602 static unsigned int neighbours_connected;
605 * Number of bytes we have currently queued for transmission.
607 static unsigned long long bytes_in_send_queue;
611 * Lookup a neighbour entry in the neighbours hash map.
613 * @param pid identity of the peer to look up
614 * @return the entry, NULL if there is no existing record
616 static struct NeighbourMapEntry *
617 lookup_neighbour (const struct GNUNET_PeerIdentity *pid)
619 if (NULL == neighbours)
621 return GNUNET_CONTAINER_multihashmap_get (neighbours, &pid->hashPubKey);
626 * Test if we're connected to the given peer.
628 * @param n neighbour entry of peer to test
629 * @return GNUNET_YES if we are connected, GNUNET_NO if not
632 test_connected (struct NeighbourMapEntry *n)
638 case S_NOT_CONNECTED:
640 case S_INIT_BLACKLIST:
642 case S_CONNECT_RECV_ATS:
643 case S_CONNECT_RECV_BLACKLIST:
644 case S_CONNECT_RECV_ACK:
647 case S_RECONNECT_ATS:
648 case S_RECONNECT_BLACKLIST:
649 case S_RECONNECT_SENT:
650 case S_CONNECTED_SWITCHING_BLACKLIST:
651 case S_CONNECTED_SWITCHING_CONNECT_SENT:
654 case S_DISCONNECT_FINISHED:
660 return GNUNET_SYSERR;
665 * Send information about a new outbound quota to our clients.
667 * @param target affected peer
668 * @param quota new quota
671 send_outbound_quota (const struct GNUNET_PeerIdentity *target,
672 struct GNUNET_BANDWIDTH_Value32NBO quota)
674 struct QuotaSetMessage q_msg;
676 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
677 "Sending outbound quota of %u Bps for peer `%s' to all clients\n",
678 ntohl (quota.value__), GNUNET_i2s (target));
679 q_msg.header.size = htons (sizeof (struct QuotaSetMessage));
680 q_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
682 q_msg.peer = (*target);
683 GST_clients_broadcast (&q_msg.header, GNUNET_NO);
688 * We don't need a given neighbour address any more.
689 * Release its resources and give appropriate notifications
690 * to ATS and other subsystems.
692 * @param na address we are done with; 'na' itself must NOT be 'free'd, only the contents!
695 free_address (struct NeighbourAddress *na)
697 if (GNUNET_YES == na->ats_active)
699 GST_validation_set_address_use (na->address, na->session, GNUNET_NO, __LINE__);
700 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, GNUNET_NO);
702 na->ats_active = GNUNET_NO;
703 if (NULL != na->address)
705 GNUNET_HELLO_address_free (na->address);
713 * Initialize the 'struct NeighbourAddress'.
715 * @param na neighbour address to initialize
716 * @param address address of the other peer, NULL if other peer
718 * @param session session to use (or NULL, in which case an
719 * address must be setup)
720 * @param bandwidth_in inbound quota to be used when connection is up
721 * @param bandwidth_out outbound quota to be used when connection is up
722 * @param is_active GNUNET_YES to mark this as the active address with ATS
725 set_address (struct NeighbourAddress *na,
726 const struct GNUNET_HELLO_Address *address,
727 struct Session *session,
728 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
729 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
732 struct GNUNET_TRANSPORT_PluginFunctions *papi;
734 if (NULL == (papi = GST_plugins_find (address->transport_name)))
739 if (session == na->session)
741 na->bandwidth_in = bandwidth_in;
742 na->bandwidth_out = bandwidth_out;
743 if (is_active != na->ats_active)
745 na->ats_active = is_active;
746 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, is_active);
747 GST_validation_set_address_use (na->address, na->session, is_active, __LINE__);
749 if (GNUNET_YES == is_active)
751 /* FIXME: is this the right place to set quotas? */
752 GST_neighbours_set_incoming_quota (&address->peer, bandwidth_in);
753 send_outbound_quota (&address->peer, bandwidth_out);
759 session = papi->get_session (papi->cls, address);
762 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
763 "Failed to obtain new session for peer `%s' and address '%s'\n",
764 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
765 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
768 na->address = GNUNET_HELLO_address_copy (address);
769 na->bandwidth_in = bandwidth_in;
770 na->bandwidth_out = bandwidth_out;
771 na->session = session;
772 na->ats_active = is_active;
773 if (GNUNET_YES == is_active)
775 /* Telling ATS about new session */
776 GNUNET_ATS_address_update (GST_ats, na->address, na->session, NULL, 0);
777 GNUNET_ATS_address_in_use (GST_ats, na->address, na->session, GNUNET_YES);
778 GST_validation_set_address_use (na->address, na->session, GNUNET_YES, __LINE__);
780 /* FIXME: is this the right place to set quotas? */
781 GST_neighbours_set_incoming_quota (&address->peer, bandwidth_in);
782 send_outbound_quota (&address->peer, bandwidth_out);
788 * Free a neighbour map entry.
790 * @param n entry to free
793 free_neighbour (struct NeighbourMapEntry *n)
795 struct MessageQueue *mq;
796 struct GNUNET_TRANSPORT_PluginFunctions *papi;
798 n->is_active = NULL; /* always free'd by its own continuation! */
800 /* fail messages currently in the queue */
801 while (NULL != (mq = n->messages_head))
803 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
804 if (NULL != mq->cont)
805 mq->cont (mq->cont_cls, GNUNET_SYSERR);
808 /* It is too late to send other peer disconnect notifications, but at
809 least internally we need to get clean... */
810 if (GNUNET_YES == test_connected (n))
812 GNUNET_STATISTICS_set (GST_stats,
813 gettext_noop ("# peers connected"),
814 --neighbours_connected,
816 disconnect_notify_cb (callback_cls, &n->id);
819 /* FIXME-PLUGIN-API: This does not seem to guarantee that all
820 transport sessions eventually get killed due to inactivity; they
821 MUST have their own timeout logic (but at least TCP doesn't have
822 one yet). Are we sure that EVERY 'session' of a plugin is
823 actually cleaned up this way!? Note that if we are switching
824 between two TCP sessions to the same peer, the existing plugin
825 API gives us not even the means to selectively kill only one of
826 them! Killing all sessions like this seems to be very, very
828 if ( (NULL != n->primary_address.address) &&
829 (NULL != (papi = GST_plugins_find (n->primary_address.address->transport_name))) )
830 papi->disconnect (papi->cls, &n->id);
832 n->state = S_DISCONNECT_FINISHED;
834 GNUNET_assert (GNUNET_YES ==
835 GNUNET_CONTAINER_multihashmap_remove (neighbours,
836 &n->id.hashPubKey, n));
838 /* cut transport-level connection */
839 free_address (&n->primary_address);
840 free_address (&n->alternative_address);
842 // FIXME-ATS-API: we might want to be more specific about
843 // which states we do this from in the future (ATS should
844 // have given us a 'suggest_address' handle, and if we have
845 // such a handle, we should cancel the operation here!
846 GNUNET_ATS_suggest_address_cancel (GST_ats, &n->id);
848 if (GNUNET_SCHEDULER_NO_TASK != n->task)
850 GNUNET_SCHEDULER_cancel (n->task);
851 n->task = GNUNET_SCHEDULER_NO_TASK;
853 /* free rest of memory */
859 * Transmit a message using the current session of the given
862 * @param n entry for the recipient
863 * @param msgbuf buffer to transmit
864 * @param msgbuf_size number of bytes in buffer
865 * @param priority transmission priority
866 * @param timeout transmission timeout
867 * @param cont continuation to call when finished (can be NULL)
868 * @param cont_cls closure for cont
871 send_with_session (struct NeighbourMapEntry *n,
872 const char *msgbuf, size_t msgbuf_size,
874 struct GNUNET_TIME_Relative timeout,
875 GNUNET_TRANSPORT_TransmitContinuation cont,
878 struct GNUNET_TRANSPORT_PluginFunctions *papi;
880 GNUNET_assert (n->primary_address.session != NULL);
881 if ( ( (NULL == (papi = GST_plugins_find (n->primary_address.address->transport_name))) ||
882 (-1 == papi->send (papi->cls,
883 n->primary_address.session,
889 cont (cont_cls, &n->id, GNUNET_SYSERR);
890 GNUNET_break (NULL != papi);
895 * Master task run for every neighbour. Performs all of the time-related
896 * activities (keep alive, send next message, disconnect if idle, finish
897 * clean up after disconnect).
899 * @param cls the 'struct NeighbourMapEntry' for which we are running
900 * @param tc scheduler context (unused)
903 master_task (void *cls,
904 const struct GNUNET_SCHEDULER_TaskContext *tc);
908 * Function called when the 'DISCONNECT' message has been sent by the
909 * plugin. Frees the neighbour --- if the entry still exists.
912 * @param target identity of the neighbour that was disconnected
913 * @param result GNUNET_OK if the disconnect got out successfully
916 send_disconnect_cont (void *cls, const struct GNUNET_PeerIdentity *target,
919 struct NeighbourMapEntry *n;
921 n = lookup_neighbour (target);
923 return; /* already gone */
924 if (S_DISCONNECT != n->state)
925 return; /* have created a fresh entry since */
926 n->state = S_DISCONNECT;
927 GNUNET_SCHEDULER_cancel (n->task);
928 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
933 * Transmit a DISCONNECT message to the other peer.
935 * @param n neighbour to send DISCONNECT message.
938 send_disconnect (struct NeighbourMapEntry *n)
940 struct SessionDisconnectMessage disconnect_msg;
942 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
943 "Sending DISCONNECT message to peer `%4s'\n",
944 GNUNET_i2s (&n->id));
945 disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
946 disconnect_msg.header.type =
947 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
948 disconnect_msg.reserved = htonl (0);
949 disconnect_msg.purpose.size =
950 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
951 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
952 sizeof (struct GNUNET_TIME_AbsoluteNBO));
953 disconnect_msg.purpose.purpose =
954 htonl (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
955 disconnect_msg.timestamp =
956 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
957 disconnect_msg.public_key = GST_my_public_key;
958 GNUNET_assert (GNUNET_OK ==
959 GNUNET_CRYPTO_rsa_sign (GST_my_private_key,
960 &disconnect_msg.purpose,
961 &disconnect_msg.signature));
963 send_with_session (n,
964 (const char *) &disconnect_msg, sizeof (disconnect_msg),
965 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
966 &send_disconnect_cont, NULL);
967 GNUNET_STATISTICS_update (GST_stats,
969 ("# DISCONNECT messages sent"), 1,
975 * Disconnect from the given neighbour, clean up the record.
977 * @param n neighbour to disconnect from
980 disconnect_neighbour (struct NeighbourMapEntry *n)
982 /* depending on state, notify neighbour and/or upper layers of this peer
986 case S_NOT_CONNECTED:
988 case S_INIT_BLACKLIST:
989 /* other peer is completely unaware of us, no need to send DISCONNECT */
990 n->state = S_DISCONNECT_FINISHED;
995 n->state = S_DISCONNECT;
997 case S_CONNECT_RECV_ATS:
998 case S_CONNECT_RECV_BLACKLIST:
999 /* we never ACK'ed the other peer's request, no need to send DISCONNECT */
1000 n->state = S_DISCONNECT_FINISHED;
1003 case S_CONNECT_RECV_ACK:
1004 /* we DID ACK the other peer's request, must send DISCONNECT */
1005 send_disconnect (n);
1006 n->state = S_DISCONNECT;
1009 case S_RECONNECT_BLACKLIST:
1010 case S_RECONNECT_SENT:
1011 case S_CONNECTED_SWITCHING_BLACKLIST:
1012 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1013 /* we are currently connected, need to send disconnect and do
1014 internal notifications and update statistics */
1015 send_disconnect (n);
1016 GNUNET_STATISTICS_set (GST_stats,
1017 gettext_noop ("# peers connected"),
1018 --neighbours_connected,
1020 disconnect_notify_cb (callback_cls, &n->id);
1021 n->state = S_DISCONNECT;
1023 case S_RECONNECT_ATS:
1024 /* ATS address request timeout, disconnect without sending disconnect message */
1025 GNUNET_STATISTICS_set (GST_stats,
1026 gettext_noop ("# peers connected"),
1027 --neighbours_connected,
1029 disconnect_notify_cb (callback_cls, &n->id);
1030 n->state = S_DISCONNECT;
1033 /* already disconnected, ignore */
1035 case S_DISCONNECT_FINISHED:
1036 /* already cleaned up, how did we get here!? */
1043 /* schedule timeout to clean up */
1044 if (GNUNET_SCHEDULER_NO_TASK != n->task)
1045 GNUNET_SCHEDULER_cancel (n->task);
1046 n->task = GNUNET_SCHEDULER_add_delayed (DISCONNECT_SENT_TIMEOUT,
1052 * We're done with our transmission attempt, continue processing.
1054 * @param cls the 'struct MessageQueue' of the message
1055 * @param receiver intended receiver
1056 * @param success whether it worked or not
1059 transmit_send_continuation (void *cls,
1060 const struct GNUNET_PeerIdentity *receiver,
1063 struct MessageQueue *mq = cls;
1064 struct NeighbourMapEntry *n;
1066 n = lookup_neighbour (receiver);
1073 if (n->is_active == mq)
1075 /* this is still "our" neighbour, remove us from its queue
1076 and allow it to send the next message now */
1077 n->is_active = NULL;
1078 GNUNET_SCHEDULER_cancel (n->task);
1079 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1081 GNUNET_assert (bytes_in_send_queue >= mq->message_buf_size);
1082 bytes_in_send_queue -= mq->message_buf_size;
1083 GNUNET_STATISTICS_set (GST_stats,
1085 ("# bytes in message queue for other peers"),
1086 bytes_in_send_queue, GNUNET_NO);
1087 if (GNUNET_OK == success)
1088 GNUNET_STATISTICS_update (GST_stats,
1090 ("# messages transmitted to other peers"),
1093 GNUNET_STATISTICS_update (GST_stats,
1095 ("# transmission failures for messages to other peers"),
1097 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1098 "Sending message to `%s' of type %u was a %s\n",
1099 GNUNET_i2s (receiver),
1100 ntohs (((struct GNUNET_MessageHeader *) mq->message_buf)->type),
1101 (success == GNUNET_OK) ? "success" : "FAILURE");
1102 if (NULL != mq->cont)
1103 mq->cont (mq->cont_cls, success);
1109 * Check the message list for the given neighbour and if we can
1110 * send a message, do so. This function should only be called
1111 * if the connection is at least generally ready for transmission.
1112 * While we will only send one message at a time, no bandwidth
1113 * quota management is performed here. If a message was given to
1114 * the plugin, the continuation will automatically re-schedule
1115 * the 'master' task once the next message might be transmitted.
1117 * @param n target peer for which to transmit
1120 try_transmission_to_peer (struct NeighbourMapEntry *n)
1122 struct MessageQueue *mq;
1123 struct GNUNET_TIME_Relative timeout;
1125 if (NULL == n->primary_address.address)
1127 /* no address, why are we here? */
1131 if ((0 == n->primary_address.address->address_length) &&
1132 (NULL == n->primary_address.session))
1134 /* no address, why are we here? */
1138 if (NULL != n->is_active)
1140 /* transmission already pending */
1144 /* timeout messages from the queue that are past their due date */
1145 while (NULL != (mq = n->messages_head))
1147 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1148 if (timeout.rel_value > 0)
1150 GNUNET_STATISTICS_update (GST_stats,
1152 ("# messages timed out while in transport queue"),
1154 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1156 transmit_send_continuation (mq, &n->id, GNUNET_SYSERR); /* timeout */
1159 return; /* no more messages */
1160 GNUNET_CONTAINER_DLL_remove (n->messages_head, n->messages_tail, mq);
1162 send_with_session (n,
1163 mq->message_buf, mq->message_buf_size,
1164 0 /* priority */, timeout,
1165 &transmit_send_continuation, mq);
1170 * Send keepalive message to the neighbour. Must only be called
1171 * if we are on 'connected' state. Will internally determine
1172 * if a keepalive is truly needed (so can always be called).
1174 * @param n neighbour that went idle and needs a keepalive
1177 send_keepalive (struct NeighbourMapEntry *n)
1179 struct GNUNET_MessageHeader m;
1181 GNUNET_assert (S_CONNECTED == n->state);
1182 if (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time).rel_value > 0)
1183 return; /* no keepalive needed at this time */
1184 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1185 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
1186 send_with_session (n,
1187 (const void *) &m, sizeof (m),
1188 UINT32_MAX /* priority */,
1189 KEEPALIVE_FREQUENCY,
1191 GNUNET_STATISTICS_update (GST_stats, gettext_noop ("# keepalives sent"), 1,
1193 n->expect_latency_response = GNUNET_YES;
1194 n->last_keep_alive_time = GNUNET_TIME_absolute_get ();
1195 n->keep_alive_time = GNUNET_TIME_relative_to_absolute (KEEPALIVE_FREQUENCY);
1200 * Keep the connection to the given neighbour alive longer,
1201 * we received a KEEPALIVE (or equivalent); send a response.
1203 * @param neighbour neighbour to keep alive (by sending keep alive response)
1206 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour)
1208 struct NeighbourMapEntry *n;
1209 struct GNUNET_MessageHeader m;
1211 if (NULL == (n = lookup_neighbour (neighbour)))
1213 GNUNET_STATISTICS_update (GST_stats,
1215 ("# KEEPALIVE messages discarded (peer unknown)"),
1219 if (NULL == n->primary_address.session)
1221 GNUNET_STATISTICS_update (GST_stats,
1223 ("# KEEPALIVE messages discarded (no session)"),
1227 /* send reply to allow neighbour to measure latency */
1228 m.size = htons (sizeof (struct GNUNET_MessageHeader));
1229 m.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE);
1230 send_with_session(n,
1231 (const void *) &m, sizeof (m),
1232 UINT32_MAX /* priority */,
1233 KEEPALIVE_FREQUENCY,
1239 * We received a KEEP_ALIVE_RESPONSE message and use this to calculate
1240 * latency to this peer. Pass the updated information (existing ats
1241 * plus calculated latency) to ATS.
1243 * @param neighbour neighbour to keep alive
1244 * @param ats performance data
1245 * @param ats_count number of entries in ats
1248 GST_neighbours_keepalive_response (const struct GNUNET_PeerIdentity *neighbour,
1249 const struct GNUNET_ATS_Information *ats,
1252 struct NeighbourMapEntry *n;
1254 struct GNUNET_ATS_Information ats_new[ats_count + 1];
1256 if (NULL == (n = lookup_neighbour (neighbour)))
1258 GNUNET_STATISTICS_update (GST_stats,
1260 ("# KEEPALIVE_RESPONSE messages discarded (not connected)"),
1264 if ( (S_CONNECTED != n->state) ||
1265 (GNUNET_YES != n->expect_latency_response) )
1267 GNUNET_STATISTICS_update (GST_stats,
1269 ("# KEEPALIVE_RESPONSE messages discarded (not expected)"),
1273 n->expect_latency_response = GNUNET_NO;
1274 n->latency = GNUNET_TIME_absolute_get_duration (n->last_keep_alive_time);
1275 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1276 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1277 "Latency for peer `%s' is %llu ms\n",
1278 GNUNET_i2s (&n->id), n->latency.rel_value);
1279 memcpy (ats_new, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1280 /* append latency */
1281 ats_new[ats_count].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
1282 if (n->latency.rel_value > UINT32_MAX)
1283 latency = UINT32_MAX;
1285 latency = n->latency.rel_value;
1286 ats_new[ats_count].value = htonl (latency);
1287 GNUNET_ATS_address_update (GST_ats,
1288 n->primary_address.address,
1289 n->primary_address.session, ats_new,
1295 * We have received a message from the given sender. How long should
1296 * we delay before receiving more? (Also used to keep the peer marked
1299 * @param sender sender of the message
1300 * @param size size of the message
1301 * @param do_forward set to GNUNET_YES if the message should be forwarded to clients
1302 * GNUNET_NO if the neighbour is not connected or violates the quota,
1303 * GNUNET_SYSERR if the connection is not fully up yet
1304 * @return how long to wait before reading more from this sender
1306 struct GNUNET_TIME_Relative
1307 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
1308 *sender, ssize_t size, int *do_forward)
1310 struct NeighbourMapEntry *n;
1311 struct GNUNET_TIME_Relative ret;
1313 if (NULL == neighbours)
1315 *do_forward = GNUNET_NO;
1316 return GNUNET_TIME_UNIT_FOREVER_REL; /* This can happen during shutdown */
1318 if (NULL == (n = lookup_neighbour (sender)))
1320 GST_neighbours_try_connect (sender);
1321 if (NULL == (n = lookup_neighbour (sender)))
1323 GNUNET_STATISTICS_update (GST_stats,
1325 ("# messages discarded due to lack of neighbour record"),
1327 *do_forward = GNUNET_NO;
1328 return GNUNET_TIME_UNIT_ZERO;
1331 if (! test_connected (n))
1333 *do_forward = GNUNET_SYSERR;
1334 return GNUNET_TIME_UNIT_ZERO;
1336 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
1338 n->quota_violation_count++;
1339 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1340 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
1341 n->in_tracker.available_bytes_per_s__,
1342 n->quota_violation_count);
1343 /* Discount 32k per violation */
1344 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
1348 if (n->quota_violation_count > 0)
1350 /* try to add 32k back */
1351 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
1352 n->quota_violation_count--;
1355 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
1357 GNUNET_STATISTICS_update (GST_stats,
1359 ("# bandwidth quota violations by other peers"),
1361 *do_forward = GNUNET_NO;
1362 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
1364 *do_forward = GNUNET_YES;
1365 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 32 * 1024);
1366 if (ret.rel_value > 0)
1368 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1369 "Throttling read (%llu bytes excess at %u b/s), waiting %llu ms before reading more.\n",
1370 (unsigned long long) n->in_tracker.
1371 consumption_since_last_update__,
1372 (unsigned int) n->in_tracker.available_bytes_per_s__,
1373 (unsigned long long) ret.rel_value);
1374 GNUNET_STATISTICS_update (GST_stats,
1375 gettext_noop ("# ms throttling suggested"),
1376 (int64_t) ret.rel_value, GNUNET_NO);
1383 * Transmit a message to the given target using the active connection.
1385 * @param target destination
1386 * @param msg message to send
1387 * @param msg_size number of bytes in msg
1388 * @param timeout when to fail with timeout
1389 * @param cont function to call when done
1390 * @param cont_cls closure for 'cont'
1393 GST_neighbours_send (const struct GNUNET_PeerIdentity *target, const void *msg,
1394 size_t msg_size, struct GNUNET_TIME_Relative timeout,
1395 GST_NeighbourSendContinuation cont, void *cont_cls)
1397 struct NeighbourMapEntry *n;
1398 struct MessageQueue *mq;
1400 /* All ove these cases should never happen; they are all API violations.
1401 But we check anyway, just to be sure. */
1402 if (NULL == (n = lookup_neighbour (target)))
1406 cont (cont_cls, GNUNET_SYSERR);
1409 if (GNUNET_YES != test_connected (n))
1413 cont (cont_cls, GNUNET_SYSERR);
1416 if ((NULL == n->primary_address.session) && (NULL == n->primary_address.address))
1420 cont (cont_cls, GNUNET_SYSERR);
1424 bytes_in_send_queue += msg_size;
1425 GNUNET_STATISTICS_set (GST_stats,
1427 ("# bytes in message queue for other peers"),
1428 bytes_in_send_queue, GNUNET_NO);
1429 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
1431 mq->cont_cls = cont_cls;
1432 memcpy (&mq[1], msg, msg_size);
1433 mq->message_buf = (const char *) &mq[1];
1434 mq->message_buf_size = msg_size;
1435 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1436 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
1437 if (NULL != n->is_active)
1439 GNUNET_SCHEDULER_cancel (n->task);
1440 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1445 * Send a SESSION_CONNECT message via the given address.
1447 * @param na address to use
1450 send_session_connect (struct NeighbourAddress *na)
1452 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1453 struct SessionConnectMessage connect_msg;
1455 if (NULL == (papi = GST_plugins_find (na->address->transport_name)))
1460 if (NULL == na->session)
1461 na->session = papi->get_session (papi->cls, na->address);
1462 if (NULL == na->session)
1467 na->connect_timestamp = GNUNET_TIME_absolute_get ();
1468 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1469 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT);
1470 connect_msg.reserved = htonl (0);
1471 connect_msg.timestamp = GNUNET_TIME_absolute_hton (na->connect_timestamp);
1472 (void) papi->send (papi->cls,
1474 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1476 GNUNET_TIME_UNIT_FOREVER_REL,
1482 * Send a SESSION_CONNECT_ACK message via the given address.
1484 * @param address address to use
1485 * @param session session to use
1486 * @param timestamp timestamp to use for the ACK message
1489 send_session_connect_ack_message (const struct GNUNET_HELLO_Address *address,
1490 struct Session *session,
1491 struct GNUNET_TIME_Absolute timestamp)
1493 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1494 struct SessionConnectMessage connect_msg;
1496 if (NULL == (papi = GST_plugins_find (address->transport_name)))
1501 if (NULL == session)
1502 session = papi->get_session (papi->cls, address);
1503 if (NULL == session)
1508 connect_msg.header.size = htons (sizeof (struct SessionConnectMessage));
1509 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT_ACK);
1510 connect_msg.reserved = htonl (0);
1511 connect_msg.timestamp = GNUNET_TIME_absolute_hton (timestamp);
1512 (void) papi->send (papi->cls,
1514 (const char *) &connect_msg, sizeof (struct SessionConnectMessage),
1516 GNUNET_TIME_UNIT_FOREVER_REL,
1522 * Create a fresh entry in the neighbour map for the given peer
1524 * @param peer peer to create an entry for
1525 * @return new neighbour map entry
1527 static struct NeighbourMapEntry *
1528 setup_neighbour (const struct GNUNET_PeerIdentity *peer)
1530 struct NeighbourMapEntry *n;
1532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1533 "Creating new neighbour entry for `%s'\n",
1535 n = GNUNET_malloc (sizeof (struct NeighbourMapEntry));
1537 n->state = S_NOT_CONNECTED;
1538 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
1539 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
1540 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
1541 MAX_BANDWIDTH_CARRY_S);
1542 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1543 GNUNET_assert (GNUNET_OK ==
1544 GNUNET_CONTAINER_multihashmap_put (neighbours,
1545 &n->id.hashPubKey, n,
1546 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1552 * Check if the two given addresses are the same.
1553 * Actually only checks if the sessions are non-NULL
1554 * (which they should be) and then if they are identical;
1555 * the actual addresses don't matter if the session
1556 * pointers match anyway, and we must have session pointers
1559 * @param a1 first address to compare
1560 * @param a2 other address to compare
1561 * @return GNUNET_NO if the addresses do not match, GNUNET_YES if they do match
1564 address_matches (const struct NeighbourAddress *a1,
1565 const struct NeighbourAddress *a2)
1567 if ( (NULL == a1->session) ||
1568 (NULL == a2->session) )
1573 return (a1->session == a2->session) ? GNUNET_YES : GNUNET_NO;
1578 * Try to create a connection to the given target (eventually).
1580 * @param target peer to try to connect to
1583 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
1585 struct NeighbourMapEntry *n;
1587 if (NULL == neighbours)
1588 return; /* during shutdown, do nothing */
1589 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1590 "Asked to connect to peer `%s'\n",
1591 GNUNET_i2s (target));
1593 memcmp (target, &GST_my_identity, sizeof (struct GNUNET_PeerIdentity)))
1595 /* refuse to connect to myself */
1596 /* FIXME: can this happen? Is this not an API violation? */
1597 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1598 "Refusing to try to connect to myself.\n");
1601 n = lookup_neighbour (target);
1606 case S_NOT_CONNECTED:
1607 /* this should not be possible */
1612 case S_INIT_BLACKLIST:
1613 case S_CONNECT_SENT:
1614 case S_CONNECT_RECV_ATS:
1615 case S_CONNECT_RECV_BLACKLIST:
1616 case S_CONNECT_RECV_ACK:
1617 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1618 "Ignoring request to try to connect to `%s', already trying!\n",
1619 GNUNET_i2s (target));
1620 return; /* already trying */
1622 case S_RECONNECT_ATS:
1623 case S_RECONNECT_BLACKLIST:
1624 case S_RECONNECT_SENT:
1625 case S_CONNECTED_SWITCHING_BLACKLIST:
1626 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1627 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1628 "Ignoring request to try to connect, already connected to `%s'!\n",
1629 GNUNET_i2s (target));
1630 return; /* already connected */
1632 /* get rid of remains, ready to re-try immediately */
1635 case S_DISCONNECT_FINISHED:
1636 /* should not be possible */
1644 n = setup_neighbour (target);
1645 n->state = S_INIT_ATS;
1646 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1647 GNUNET_ATS_suggest_address (GST_ats, target);
1652 * Function called with the result of a blacklist check.
1654 * @param cls closure with the 'struct BlackListCheckContext'
1655 * @param peer peer this check affects
1656 * @param result GNUNET_OK if the address is allowed
1659 handle_test_blacklist_cont (void *cls,
1660 const struct GNUNET_PeerIdentity *peer,
1663 struct BlackListCheckContext *bcc = cls;
1664 struct NeighbourMapEntry *n;
1667 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1668 "Connection to new address of peer `%s' based on blacklist is `%s'\n",
1670 (GNUNET_OK == result) ? "allowed" : "FORBIDDEN");
1671 if (GNUNET_OK == result)
1673 /* valid new address, let ATS know! */
1674 GNUNET_ATS_address_update (GST_ats,
1677 bcc->ats, bcc->ats_count);
1679 if (NULL == (n = lookup_neighbour (peer)))
1680 goto cleanup; /* nobody left to care about new address */
1683 case S_NOT_CONNECTED:
1684 /* this should not be possible */
1689 /* still waiting on ATS suggestion */
1691 case S_INIT_BLACKLIST:
1692 /* check if the address the blacklist was fine with matches
1693 ATS suggestion, if so, we can move on! */
1694 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1695 break; /* result for an address we currently don't care about */
1696 if (GNUNET_OK == result)
1698 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1699 n->state = S_CONNECT_SENT;
1700 send_session_connect (&n->primary_address);
1701 if (1 == n->send_connect_ack)
1703 n->send_connect_ack = 2;
1704 send_session_connect_ack_message (bcc->na.address,
1706 n->connect_ack_timestamp);
1711 GNUNET_ATS_address_destroyed (GST_ats,
1714 n->state = S_INIT_ATS;
1715 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1716 // FIXME: do we need to ask ATS again for suggestions?
1717 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1720 case S_CONNECT_SENT:
1721 /* waiting on CONNECT_ACK, don't care about blacklist */
1723 case S_CONNECT_RECV_ATS:
1724 /* still waiting on ATS suggestion, don't care about blacklist */
1726 case S_CONNECT_RECV_BLACKLIST:
1727 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1728 break; /* result for an address we currently don't care about */
1729 if (GNUNET_OK == result)
1731 n->timeout = GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT);
1732 n->state = S_CONNECT_RECV_ACK;
1733 send_session_connect_ack_message (bcc->na.address,
1735 n->connect_ack_timestamp);
1736 if (1 == n->send_connect_ack)
1737 n->send_connect_ack = 2;
1741 GNUNET_ATS_address_destroyed (GST_ats,
1744 n->state = S_INIT_ATS;
1745 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1746 // FIXME: do we need to ask ATS again for suggestions?
1747 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1750 case S_CONNECT_RECV_ACK:
1751 /* waiting on SESSION_ACK, don't care about blacklist */
1754 /* already connected, don't care about blacklist */
1756 case S_RECONNECT_ATS:
1757 /* still waiting on ATS suggestion, don't care about blacklist */
1759 case S_RECONNECT_BLACKLIST:
1760 if (GNUNET_YES != address_matches (&bcc->na, &n->primary_address))
1761 break; /* result for an address we currently don't care about */
1762 if (GNUNET_OK == result)
1764 send_session_connect (&n->primary_address);
1765 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
1766 n->state = S_RECONNECT_SENT;
1767 if (1 == n->send_connect_ack)
1769 n->send_connect_ack = 2;
1770 send_session_connect_ack_message (bcc->na.address,
1772 n->connect_ack_timestamp);
1777 GNUNET_ATS_address_destroyed (GST_ats,
1780 n->state = S_RECONNECT_ATS;
1781 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1782 // FIXME: do we need to ask ATS again for suggestions?
1783 GNUNET_ATS_suggest_address (GST_ats, &n->id);
1786 case S_RECONNECT_SENT:
1787 /* waiting on CONNECT_ACK, don't care about blacklist */
1789 case S_CONNECTED_SWITCHING_BLACKLIST:
1790 if (GNUNET_YES != address_matches (&bcc->na, &n->alternative_address))
1791 break; /* result for an address we currently don't care about */
1792 if (GNUNET_OK == result)
1794 send_session_connect (&n->alternative_address);
1795 n->state = S_CONNECTED_SWITCHING_CONNECT_SENT;
1799 GNUNET_ATS_address_destroyed (GST_ats,
1802 free_address (&n->alternative_address);
1803 n->state = S_CONNECTED;
1806 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1807 /* waiting on CONNECT_ACK, don't care about blacklist */
1810 /* Nothing to do here, ATS will already do what can be done */
1812 case S_DISCONNECT_FINISHED:
1813 /* should not be possible */
1822 GNUNET_HELLO_address_free (bcc->na.address);
1823 GNUNET_CONTAINER_DLL_remove (bc_head,
1831 * We want to know if connecting to a particular peer via
1832 * a particular address is allowed. Check it!
1834 * @param peer identity of the peer to switch the address for
1835 * @param ts time at which the check was initiated
1836 * @param address address of the other peer, NULL if other peer
1838 * @param session session to use (or NULL)
1839 * @param ats performance data
1840 * @param ats_count number of entries in ats (excluding 0-termination)
1843 check_blacklist (const struct GNUNET_PeerIdentity *peer,
1844 struct GNUNET_TIME_Absolute ts,
1845 const struct GNUNET_HELLO_Address *address,
1846 struct Session *session,
1847 const struct GNUNET_ATS_Information *ats,
1850 struct BlackListCheckContext *bcc;
1851 struct GST_BlacklistCheck *bc;
1854 GNUNET_malloc (sizeof (struct BlackListCheckContext) +
1855 sizeof (struct GNUNET_ATS_Information) * ats_count);
1856 bcc->ats_count = ats_count;
1857 bcc->na.address = GNUNET_HELLO_address_copy (address);
1858 bcc->na.session = session;
1859 bcc->na.connect_timestamp = ts;
1860 bcc->ats = (struct GNUNET_ATS_Information *) &bcc[1];
1861 memcpy (bcc->ats, ats, sizeof (struct GNUNET_ATS_Information) * ats_count);
1862 GNUNET_CONTAINER_DLL_insert (bc_head,
1865 if (NULL != (bc = GST_blacklist_test_allowed (peer,
1866 address->transport_name,
1867 &handle_test_blacklist_cont, bcc)))
1869 /* if NULL == bc, 'cont' was already called and 'bcc' already free'd, so
1870 we must only store 'bc' if 'bc' is non-NULL... */
1875 * We received a 'SESSION_CONNECT' message from the other peer.
1876 * Consider switching to it.
1878 * @param message possibly a 'struct SessionConnectMessage' (check format)
1879 * @param peer identity of the peer to switch the address for
1880 * @param address address of the other peer, NULL if other peer
1882 * @param session session to use (or NULL)
1883 * @param ats performance data
1884 * @param ats_count number of entries in ats (excluding 0-termination)
1887 GST_neighbours_handle_connect (const struct GNUNET_MessageHeader *message,
1888 const struct GNUNET_PeerIdentity *peer,
1889 const struct GNUNET_HELLO_Address *address,
1890 struct Session *session,
1891 const struct GNUNET_ATS_Information *ats,
1894 const struct SessionConnectMessage *scm;
1895 struct NeighbourMapEntry *n;
1896 struct GNUNET_TIME_Absolute ts;
1898 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1899 "Received CONNECT message from peer `%s'\n",
1901 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
1903 GNUNET_break_op (0);
1906 if (NULL == neighbours)
1907 return; /* we're shutting down */
1908 scm = (const struct SessionConnectMessage *) message;
1909 GNUNET_break_op (0 == ntohl (scm->reserved));
1910 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
1911 n = lookup_neighbour (peer);
1913 n = setup_neighbour (peer);
1914 n->send_connect_ack = 1;
1915 n->connect_ack_timestamp = ts;
1918 case S_NOT_CONNECTED:
1919 n->state = S_CONNECT_RECV_ATS;
1920 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
1921 GNUNET_ATS_suggest_address (GST_ats, peer);
1922 check_blacklist (peer, ts, address, session, ats, ats_count);
1925 case S_INIT_BLACKLIST:
1926 case S_CONNECT_SENT:
1927 case S_CONNECT_RECV_ATS:
1928 case S_CONNECT_RECV_BLACKLIST:
1929 case S_CONNECT_RECV_ACK:
1930 /* It can never hurt to have an alternative address in the above cases,
1931 see if it is allowed */
1932 check_blacklist (peer, ts, address, session, ats, ats_count);
1935 /* we are already connected and can thus send the ACK immediately;
1936 still, it can never hurt to have an alternative address, so also
1937 tell ATS about it */
1938 GNUNET_assert (NULL != n->primary_address.address);
1939 GNUNET_assert (NULL != n->primary_address.session);
1940 n->send_connect_ack = 0;
1941 send_session_connect_ack_message (n->primary_address.address,
1942 n->primary_address.session, ts);
1943 check_blacklist (peer, ts, address, session, ats, ats_count);
1945 case S_RECONNECT_ATS:
1946 case S_RECONNECT_BLACKLIST:
1947 case S_RECONNECT_SENT:
1948 /* It can never hurt to have an alternative address in the above cases,
1949 see if it is allowed */
1950 check_blacklist (peer, ts, address, session, ats, ats_count);
1952 case S_CONNECTED_SWITCHING_BLACKLIST:
1953 case S_CONNECTED_SWITCHING_CONNECT_SENT:
1954 /* we are already connected and can thus send the ACK immediately;
1955 still, it can never hurt to have an alternative address, so also
1956 tell ATS about it */
1957 GNUNET_assert (NULL != n->primary_address.address);
1958 GNUNET_assert (NULL != n->primary_address.session);
1959 n->send_connect_ack = 0;
1960 send_session_connect_ack_message (n->primary_address.address,
1961 n->primary_address.session, ts);
1962 check_blacklist (peer, ts, address, session, ats, ats_count);
1965 /* get rid of remains, ready to re-try */
1967 n = setup_neighbour (peer);
1968 n->state = S_CONNECT_RECV_ATS;
1969 GNUNET_ATS_suggest_address (GST_ats, peer);
1970 check_blacklist (peer, ts, address, session, ats, ats_count);
1972 case S_DISCONNECT_FINISHED:
1973 /* should not be possible */
1985 * For an existing neighbour record, set the active connection to
1986 * use the given address.
1988 * @param peer identity of the peer to switch the address for
1989 * @param address address of the other peer, NULL if other peer
1991 * @param session session to use (or NULL)
1992 * @param ats performance data
1993 * @param ats_count number of entries in ats
1994 * @param bandwidth_in inbound quota to be used when connection is up
1995 * @param bandwidth_out outbound quota to be used when connection is up
1998 GST_neighbours_switch_to_address (const struct GNUNET_PeerIdentity *peer,
1999 const struct GNUNET_HELLO_Address *address,
2000 struct Session *session,
2001 const struct GNUNET_ATS_Information *ats,
2003 struct GNUNET_BANDWIDTH_Value32NBO
2005 struct GNUNET_BANDWIDTH_Value32NBO
2008 struct NeighbourMapEntry *n;
2009 struct GNUNET_TRANSPORT_PluginFunctions *papi;
2011 GNUNET_assert (address->transport_name != NULL);
2012 if (NULL == (n = lookup_neighbour (peer)))
2015 /* Obtain an session for this address from plugin */
2016 if (NULL == (papi = GST_plugins_find (address->transport_name)))
2018 /* we don't have the plugin for this address */
2019 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2022 if ((NULL == session) && (0 == address->address_length))
2025 if (strlen (address->transport_name) > 0)
2026 GNUNET_ATS_address_destroyed (GST_ats, address, session);
2029 if (NULL == session)
2030 session = papi->get_session (papi->cls, address);
2031 if (NULL == session)
2033 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2034 "Failed to obtain new session for peer `%s' and address '%s'\n",
2035 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
2036 GNUNET_ATS_address_destroyed (GST_ats, address, NULL);
2039 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2040 "ATS tells us to switch to address '%s' for peer `%s'\n",
2041 (address->address_length != 0) ? GST_plugins_a2s (address): "<inbound>",
2045 case S_NOT_CONNECTED:
2050 set_address (&n->primary_address,
2051 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2052 n->state = S_INIT_BLACKLIST;
2053 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2054 check_blacklist (&n->id,
2055 n->connect_ack_timestamp,
2056 address, session, ats, ats_count);
2058 case S_INIT_BLACKLIST:
2059 /* ATS suggests a different address, switch again */
2060 set_address (&n->primary_address,
2061 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2062 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2063 check_blacklist (&n->id,
2064 n->connect_ack_timestamp,
2065 address, session, ats, ats_count);
2067 case S_CONNECT_SENT:
2068 /* ATS suggests a different address, switch again */
2069 set_address (&n->primary_address,
2070 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2071 n->state = S_INIT_BLACKLIST;
2072 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2073 check_blacklist (&n->id,
2074 n->connect_ack_timestamp,
2075 address, session, ats, ats_count);
2077 case S_CONNECT_RECV_ATS:
2078 set_address (&n->primary_address,
2079 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2080 n->state = S_CONNECT_RECV_BLACKLIST;
2081 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2082 check_blacklist (&n->id,
2083 n->connect_ack_timestamp,
2084 address, session, ats, ats_count);
2086 case S_CONNECT_RECV_BLACKLIST:
2087 /* ATS asks us to switch while we were trying to connect; switch to new
2088 address and check blacklist again */
2089 set_address (&n->primary_address,
2090 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2091 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2092 check_blacklist (&n->id,
2093 n->connect_ack_timestamp,
2094 address, session, ats, ats_count);
2097 GNUNET_assert (NULL != n->primary_address.address);
2098 GNUNET_assert (NULL != n->primary_address.session);
2099 if (n->primary_address.session == session)
2101 /* not an address change, just a quota change */
2102 set_address (&n->primary_address,
2103 address, session, bandwidth_in, bandwidth_out, GNUNET_YES);
2106 /* ATS asks us to switch a life connection; see if we can get
2107 a CONNECT_ACK on it before we actually do this! */
2108 set_address (&n->alternative_address,
2109 address, session, bandwidth_in, bandwidth_out, GNUNET_YES);
2110 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2111 check_blacklist (&n->id,
2112 GNUNET_TIME_absolute_get (),
2113 address, session, ats, ats_count);
2115 case S_RECONNECT_ATS:
2116 set_address (&n->primary_address,
2117 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2118 n->state = S_RECONNECT_BLACKLIST;
2119 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2120 check_blacklist (&n->id,
2121 n->connect_ack_timestamp,
2122 address, session, ats, ats_count);
2124 case S_RECONNECT_BLACKLIST:
2125 /* ATS asks us to switch while we were trying to reconnect; switch to new
2126 address and check blacklist again */
2127 set_address (&n->primary_address,
2128 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2129 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2130 check_blacklist (&n->id,
2131 n->connect_ack_timestamp,
2132 address, session, ats, ats_count);
2134 case S_RECONNECT_SENT:
2135 /* ATS asks us to switch while we were trying to reconnect; switch to new
2136 address and check blacklist again */
2137 set_address (&n->primary_address,
2138 address, session, bandwidth_in, bandwidth_out, GNUNET_NO);
2139 n->state = S_RECONNECT_BLACKLIST;
2140 n->timeout = GNUNET_TIME_relative_to_absolute (BLACKLIST_RESPONSE_TIMEOUT);
2141 check_blacklist (&n->id,
2142 n->connect_ack_timestamp,
2143 address, session, ats, ats_count);
2145 case S_CONNECTED_SWITCHING_BLACKLIST:
2146 if (n->primary_address.session == session)
2148 /* ATS switches back to still-active session */
2149 free_address (&n->alternative_address);
2150 n->state = S_CONNECTED;
2153 /* ATS asks us to switch a life connection, update blacklist check */
2154 set_address (&n->alternative_address,
2155 address, session, bandwidth_in, bandwidth_out, GNUNET_YES);
2156 check_blacklist (&n->id,
2157 GNUNET_TIME_absolute_get (),
2158 address, session, ats, ats_count);
2160 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2161 if (n->primary_address.session == session)
2163 /* ATS switches back to still-active session */
2164 free_address (&n->alternative_address);
2165 n->state = S_CONNECTED;
2168 /* ATS asks us to switch a life connection, update blacklist check */
2169 set_address (&n->alternative_address,
2170 address, session, bandwidth_in, bandwidth_out, GNUNET_YES);
2171 n->state = S_CONNECTED_SWITCHING_BLACKLIST;
2172 check_blacklist (&n->id,
2173 GNUNET_TIME_absolute_get (),
2174 address, session, ats, ats_count);
2177 /* not going to switch addresses while disconnecting */
2179 case S_DISCONNECT_FINISHED:
2190 * Master task run for every neighbour. Performs all of the time-related
2191 * activities (keep alive, send next message, disconnect if idle, finish
2192 * clean up after disconnect).
2194 * @param cls the 'struct NeighbourMapEntry' for which we are running
2195 * @param tc scheduler context (unused)
2198 master_task (void *cls,
2199 const struct GNUNET_SCHEDULER_TaskContext *tc)
2201 struct NeighbourMapEntry *n = cls;
2202 struct GNUNET_TIME_Relative delay;
2204 n->task = GNUNET_SCHEDULER_NO_TASK;
2205 delay = GNUNET_TIME_absolute_get_remaining (n->timeout);
2208 case S_NOT_CONNECTED:
2209 /* invalid state for master task, clean up */
2211 n->state = S_DISCONNECT_FINISHED;
2215 if (0 == delay.rel_value)
2217 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2218 "Connection to `%s' timed out waiting for ATS to provide address\n",
2219 GNUNET_i2s (&n->id));
2220 n->state = S_DISCONNECT_FINISHED;
2225 case S_INIT_BLACKLIST:
2226 if (0 == delay.rel_value)
2228 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2229 "Connection to `%s' timed out waiting for BLACKLIST to approve address\n",
2230 GNUNET_i2s (&n->id));
2231 n->state = S_DISCONNECT_FINISHED;
2236 case S_CONNECT_SENT:
2237 if (0 == delay.rel_value)
2239 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2240 "Connection to `%s' timed out waiting for other peer to send CONNECT_ACK\n",
2241 GNUNET_i2s (&n->id));
2242 disconnect_neighbour (n);
2246 case S_CONNECT_RECV_ATS:
2247 if (0 == delay.rel_value)
2249 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2250 "Connection to `%s' timed out waiting ATS to provide address to use for CONNECT_ACK\n",
2251 GNUNET_i2s (&n->id));
2252 n->state = S_DISCONNECT_FINISHED;
2257 case S_CONNECT_RECV_BLACKLIST:
2258 if (0 == delay.rel_value)
2260 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2261 "Connection to `%s' timed out waiting BLACKLIST to approve address to use for CONNECT_ACK\n",
2262 GNUNET_i2s (&n->id));
2263 n->state = S_DISCONNECT_FINISHED;
2268 case S_CONNECT_RECV_ACK:
2269 if (0 == delay.rel_value)
2271 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2272 "Connection to `%s' timed out waiting for other peer to send SESSION_ACK\n",
2273 GNUNET_i2s (&n->id));
2274 disconnect_neighbour (n);
2279 if (0 == delay.rel_value)
2281 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2282 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2283 GNUNET_i2s (&n->id));
2284 disconnect_neighbour (n);
2287 try_transmission_to_peer (n);
2290 case S_RECONNECT_ATS:
2291 if (0 == delay.rel_value)
2293 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2294 "Connection to `%s' timed out, waiting for ATS replacement address\n",
2295 GNUNET_i2s (&n->id));
2296 disconnect_neighbour (n);
2300 case S_RECONNECT_BLACKLIST:
2301 if (0 == delay.rel_value)
2303 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2304 "Connection to `%s' timed out, waiting for BLACKLIST to approve replacement address\n",
2305 GNUNET_i2s (&n->id));
2306 disconnect_neighbour (n);
2310 case S_RECONNECT_SENT:
2311 if (0 == delay.rel_value)
2313 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2314 "Connection to `%s' timed out, waiting for other peer to CONNECT_ACK replacement address\n",
2315 GNUNET_i2s (&n->id));
2316 disconnect_neighbour (n);
2320 case S_CONNECTED_SWITCHING_BLACKLIST:
2321 if (0 == delay.rel_value)
2323 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2324 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2325 GNUNET_i2s (&n->id));
2326 disconnect_neighbour (n);
2329 try_transmission_to_peer (n);
2332 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2333 if (0 == delay.rel_value)
2335 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2336 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs (after trying to CONNECT on alternative address)\n",
2337 GNUNET_i2s (&n->id));
2338 disconnect_neighbour (n);
2341 try_transmission_to_peer (n);
2345 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2346 "Cleaning up connection to `%s' after sending DISCONNECT\n",
2347 GNUNET_i2s (&n->id));
2348 n->state = S_DISCONNECT_FINISHED;
2351 case S_DISCONNECT_FINISHED:
2352 /* how did we get here!? */
2359 delay = GNUNET_TIME_relative_min (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time),
2361 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == n->task);
2362 n->task = GNUNET_SCHEDULER_add_delayed (delay,
2369 * Send a SESSION_ACK message to the neighbour to confirm that we
2370 * got his CONNECT_ACK.
2372 * @param n neighbour to send the SESSION_ACK to
2375 send_session_ack_message (struct NeighbourMapEntry *n)
2377 struct GNUNET_MessageHeader msg;
2379 msg.size = htons (sizeof (struct GNUNET_MessageHeader));
2380 msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK);
2381 (void) send_with_session(n,
2382 (const char *) &msg, sizeof (struct GNUNET_MessageHeader),
2383 UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_REL,
2389 * We received a 'SESSION_CONNECT_ACK' message from the other peer.
2390 * Consider switching to it.
2392 * @param message possibly a 'struct SessionConnectMessage' (check format)
2393 * @param peer identity of the peer to switch the address for
2394 * @param address address of the other peer, NULL if other peer
2396 * @param session session to use (or NULL)
2397 * @param ats performance data
2398 * @param ats_count number of entries in ats
2401 GST_neighbours_handle_connect_ack (const struct GNUNET_MessageHeader *message,
2402 const struct GNUNET_PeerIdentity *peer,
2403 const struct GNUNET_HELLO_Address *address,
2404 struct Session *session,
2405 const struct GNUNET_ATS_Information *ats,
2408 const struct SessionConnectMessage *scm;
2409 struct GNUNET_TIME_Absolute ts;
2410 struct NeighbourMapEntry *n;
2412 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2413 "Received CONNECT_ACK message from peer `%s'\n",
2415 if (ntohs (message->size) != sizeof (struct SessionConnectMessage))
2417 GNUNET_break_op (0);
2420 scm = (const struct SessionConnectMessage *) message;
2421 GNUNET_break_op (ntohl (scm->reserved) == 0);
2422 if (NULL == (n = lookup_neighbour (peer)))
2424 GNUNET_STATISTICS_update (GST_stats,
2426 ("# unexpected CONNECT_ACK messages (no peer)"),
2430 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2433 case S_NOT_CONNECTED:
2438 case S_INIT_BLACKLIST:
2439 GNUNET_STATISTICS_update (GST_stats,
2441 ("# unexpected CONNECT_ACK messages (not ready)"),
2444 case S_CONNECT_SENT:
2445 if (ts.abs_value != n->primary_address.connect_timestamp.abs_value)
2446 break; /* ACK does not match our original CONNECT message */
2447 n->state = S_CONNECTED;
2448 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2449 GNUNET_STATISTICS_set (GST_stats,
2450 gettext_noop ("# peers connected"),
2451 ++neighbours_connected,
2453 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2454 set_address (&n->primary_address,
2455 n->primary_address.address,
2456 n->primary_address.session,
2457 n->primary_address.bandwidth_in,
2458 n->primary_address.bandwidth_out,
2460 send_session_ack_message (n);
2462 case S_CONNECT_RECV_ATS:
2463 case S_CONNECT_RECV_BLACKLIST:
2464 case S_CONNECT_RECV_ACK:
2465 GNUNET_STATISTICS_update (GST_stats,
2467 ("# unexpected CONNECT_ACK messages (not ready)"),
2471 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2472 send_session_ack_message (n);
2474 case S_RECONNECT_ATS:
2475 case S_RECONNECT_BLACKLIST:
2476 /* we didn't expect any CONNECT_ACK, as we are waiting for ATS
2477 to give us a new address... */
2478 GNUNET_STATISTICS_update (GST_stats,
2480 ("# unexpected CONNECT_ACK messages (waiting on ATS)"),
2483 case S_RECONNECT_SENT:
2484 /* new address worked; go back to connected! */
2485 n->state = S_CONNECTED;
2486 send_session_ack_message (n);
2488 case S_CONNECTED_SWITCHING_BLACKLIST:
2489 /* duplicate CONNECT_ACK, let's answer by duplciate SESSION_ACK just in case */
2490 send_session_ack_message (n);
2492 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2493 /* new address worked; adopt it and go back to connected! */
2494 n->state = S_CONNECTED;
2495 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2496 GNUNET_assert (GNUNET_NO == n->alternative_address.ats_active);
2497 set_address (&n->primary_address,
2498 n->alternative_address.address,
2499 n->alternative_address.session,
2500 n->alternative_address.bandwidth_in,
2501 n->alternative_address.bandwidth_out,
2503 free_address (&n->alternative_address);
2504 send_session_ack_message (n);
2507 GNUNET_STATISTICS_update (GST_stats,
2509 ("# unexpected CONNECT_ACK messages (disconnecting)"),
2512 case S_DISCONNECT_FINISHED:
2523 * A session was terminated. Take note; if needed, try to get
2524 * an alternative address from ATS.
2526 * @param peer identity of the peer where the session died
2527 * @param session session that is gone
2530 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
2531 struct Session *session)
2533 struct NeighbourMapEntry *n;
2534 struct BlackListCheckContext *bcc;
2535 struct BlackListCheckContext *bcc_next;
2537 /* make sure to cancel all ongoing blacklist checks involving 'session' */
2539 while (NULL != (bcc = bcc_next))
2541 bcc_next = bcc->next;
2542 if (bcc->na.session == session)
2544 GST_blacklist_test_cancel (bcc->bc);
2545 GNUNET_HELLO_address_free (bcc->na.address);
2546 GNUNET_CONTAINER_DLL_remove (bc_head,
2552 if (NULL == (n = lookup_neighbour (peer)))
2553 return; /* can't affect us */
2554 if (session != n->primary_address.session)
2556 if (session == n->alternative_address.session)
2558 free_address (&n->alternative_address);
2559 if ( (S_CONNECTED_SWITCHING_BLACKLIST == n->state) ||
2560 (S_CONNECTED_SWITCHING_CONNECT_SENT == n->state) )
2561 n->state = S_CONNECTED;
2565 return; /* doesn't affect us further */
2568 n->expect_latency_response = GNUNET_NO;
2572 case S_NOT_CONNECTED:
2580 case S_INIT_BLACKLIST:
2581 case S_CONNECT_SENT:
2582 free_address (&n->primary_address);
2583 n->state = S_INIT_ATS;
2584 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2585 // FIXME: need to ask ATS for suggestions again?
2586 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2588 case S_CONNECT_RECV_ATS:
2589 case S_CONNECT_RECV_BLACKLIST:
2590 case S_CONNECT_RECV_ACK:
2591 /* error on inbound session; free neighbour entirely */
2592 free_address (&n->primary_address);
2596 free_address (&n->primary_address);
2597 n->state = S_RECONNECT_ATS;
2598 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2599 /* FIXME: is this ATS call needed? */
2600 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2602 case S_RECONNECT_ATS:
2603 /* we don't have an address, how can it go down? */
2606 case S_RECONNECT_BLACKLIST:
2607 case S_RECONNECT_SENT:
2608 n->state = S_RECONNECT_ATS;
2609 n->timeout = GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT);
2610 // FIXME: need to ask ATS for suggestions again?
2611 GNUNET_ATS_suggest_address (GST_ats, &n->id);
2613 case S_CONNECTED_SWITCHING_BLACKLIST:
2614 /* primary went down while we were checking secondary against
2615 blacklist, adopt secondary as primary */
2616 free_address (&n->primary_address);
2617 n->primary_address = n->alternative_address;
2618 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2619 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2620 n->state = S_RECONNECT_BLACKLIST;
2622 case S_CONNECTED_SWITCHING_CONNECT_SENT:
2623 /* primary went down while we were waiting for CONNECT_ACK on secondary;
2624 secondary as primary */
2625 free_address (&n->primary_address);
2626 n->primary_address = n->alternative_address;
2627 memset (&n->alternative_address, 0, sizeof (struct NeighbourAddress));
2628 n->timeout = GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT);
2629 n->state = S_RECONNECT_SENT;
2632 free_address (&n->primary_address);
2634 case S_DISCONNECT_FINISHED:
2635 /* neighbour was freed and plugins told to terminate session */
2641 if (GNUNET_SCHEDULER_NO_TASK != n->task)
2642 GNUNET_SCHEDULER_cancel (n->task);
2643 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
2648 * We received a 'SESSION_ACK' message from the other peer.
2649 * If we sent a 'CONNECT_ACK' last, this means we are now
2650 * connected. Otherwise, do nothing.
2652 * @param message possibly a 'struct SessionConnectMessage' (check format)
2653 * @param peer identity of the peer to switch the address for
2654 * @param address address of the other peer, NULL if other peer
2656 * @param session session to use (or NULL)
2657 * @param ats performance data
2658 * @param ats_count number of entries in ats
2661 GST_neighbours_handle_session_ack (const struct GNUNET_MessageHeader *message,
2662 const struct GNUNET_PeerIdentity *peer,
2663 const struct GNUNET_HELLO_Address *address,
2664 struct Session *session,
2665 const struct GNUNET_ATS_Information *ats,
2668 struct NeighbourMapEntry *n;
2670 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2671 "Received SESSION_ACK message from peer `%s'\n",
2673 if (ntohs (message->size) != sizeof (struct GNUNET_MessageHeader))
2675 GNUNET_break_op (0);
2678 if (NULL == (n = lookup_neighbour (peer)))
2680 /* check if we are in a plausible state for having sent
2681 a CONNECT_ACK. If not, return, otherwise break */
2682 if ( ( (S_CONNECT_RECV_ACK != n->state) &&
2683 (S_CONNECT_SENT != n->state) ) ||
2684 (2 != n->send_connect_ack) )
2686 GNUNET_STATISTICS_update (GST_stats,
2687 gettext_noop ("# unexpected SESSION ACK messages"), 1,
2691 n->state = S_CONNECTED;
2692 n->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2693 GNUNET_STATISTICS_set (GST_stats,
2694 gettext_noop ("# peers connected"),
2695 ++neighbours_connected,
2697 connect_notify_cb (callback_cls, &n->id, ats, ats_count);
2698 set_address (&n->primary_address,
2699 n->primary_address.address,
2700 n->primary_address.session,
2701 n->primary_address.bandwidth_in,
2702 n->primary_address.bandwidth_out,
2708 * Test if we're connected to the given peer.
2710 * @param target peer to test
2711 * @return GNUNET_YES if we are connected, GNUNET_NO if not
2714 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
2716 return test_connected (lookup_neighbour (target));
2721 * Change the incoming quota for the given peer.
2723 * @param neighbour identity of peer to change qutoa for
2724 * @param quota new quota
2727 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
2728 struct GNUNET_BANDWIDTH_Value32NBO quota)
2730 struct NeighbourMapEntry *n;
2732 if (NULL == (n = lookup_neighbour (neighbour)))
2734 GNUNET_STATISTICS_update (GST_stats,
2736 ("# SET QUOTA messages ignored (no such peer)"),
2740 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2741 "Setting inbound quota of %u Bps for peer `%s' to all clients\n",
2742 ntohl (quota.value__), GNUNET_i2s (&n->id));
2743 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
2744 if (0 != ntohl (quota.value__))
2746 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting peer `%4s' due to `%s'\n",
2747 GNUNET_i2s (&n->id), "SET_QUOTA");
2748 if (GNUNET_YES == test_connected (n))
2749 GNUNET_STATISTICS_update (GST_stats,
2750 gettext_noop ("# disconnects due to quota of 0"),
2752 disconnect_neighbour (n);
2757 * We received a disconnect message from the given peer,
2758 * validate and process.
2760 * @param peer sender of the message
2761 * @param msg the disconnect message
2764 GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity
2766 const struct GNUNET_MessageHeader
2769 struct NeighbourMapEntry *n;
2770 const struct SessionDisconnectMessage *sdm;
2773 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2774 "Received DISCONNECT message from peer `%s'\n",
2776 if (ntohs (msg->size) != sizeof (struct SessionDisconnectMessage))
2778 // GNUNET_break_op (0);
2779 GNUNET_STATISTICS_update (GST_stats,
2781 ("# disconnect messages ignored (old format)"), 1,
2785 sdm = (const struct SessionDisconnectMessage *) msg;
2786 if (NULL == (n = lookup_neighbour (peer)))
2787 return; /* gone already */
2788 if (GNUNET_TIME_absolute_ntoh (sdm->timestamp).abs_value <= n->connect_ack_timestamp.abs_value)
2790 GNUNET_STATISTICS_update (GST_stats,
2792 ("# disconnect messages ignored (timestamp)"), 1,
2796 GNUNET_CRYPTO_hash (&sdm->public_key,
2797 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2799 if (0 != memcmp (peer, &hc, sizeof (struct GNUNET_PeerIdentity)))
2801 GNUNET_break_op (0);
2804 if (ntohl (sdm->purpose.size) !=
2805 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2806 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) +
2807 sizeof (struct GNUNET_TIME_AbsoluteNBO))
2809 GNUNET_break_op (0);
2813 GNUNET_CRYPTO_rsa_verify
2814 (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT, &sdm->purpose,
2815 &sdm->signature, &sdm->public_key))
2817 GNUNET_break_op (0);
2820 if (GNUNET_YES == test_connected (n))
2821 GNUNET_STATISTICS_update (GST_stats,
2823 ("# other peer asked to disconnect from us"), 1,
2825 disconnect_neighbour (n);
2830 * Closure for the neighbours_iterate function.
2832 struct IteratorContext
2835 * Function to call on each connected neighbour.
2837 GST_NeighbourIterator cb;
2847 * Call the callback from the closure for each connected neighbour.
2849 * @param cls the 'struct IteratorContext'
2850 * @param key the hash of the public key of the neighbour
2851 * @param value the 'struct NeighbourMapEntry'
2852 * @return GNUNET_OK (continue to iterate)
2855 neighbours_iterate (void *cls, const GNUNET_HashCode * key, void *value)
2857 struct IteratorContext *ic = cls;
2858 struct NeighbourMapEntry *n = value;
2860 if (GNUNET_YES == test_connected (n))
2861 ic->cb (ic->cb_cls, &n->id, NULL, 0, n->primary_address.address);
2867 * Iterate over all connected neighbours.
2869 * @param cb function to call
2870 * @param cb_cls closure for cb
2873 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
2875 struct IteratorContext ic;
2877 if (NULL == neighbours)
2878 return; /* can happen during shutdown */
2881 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &neighbours_iterate, &ic);
2886 * If we have an active connection to the given target, it must be shutdown.
2888 * @param target peer to disconnect from
2891 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
2893 struct NeighbourMapEntry *n;
2895 if (NULL == (n = lookup_neighbour (target)))
2896 return; /* not active */
2897 if (GNUNET_YES == test_connected (n))
2898 GNUNET_STATISTICS_update (GST_stats,
2900 ("# disconnected from peer upon explicit request"), 1,
2902 disconnect_neighbour (n);
2907 * Obtain current latency information for the given neighbour.
2909 * @param peer to get the latency for
2910 * @return observed latency of the address, FOREVER if the
2911 * the connection is not up
2913 struct GNUNET_TIME_Relative
2914 GST_neighbour_get_latency (const struct GNUNET_PeerIdentity *peer)
2916 struct NeighbourMapEntry *n;
2918 n = lookup_neighbour (peer);
2920 return GNUNET_TIME_UNIT_FOREVER_REL;
2924 case S_RECONNECT_SENT:
2925 case S_RECONNECT_ATS:
2927 case S_NOT_CONNECTED:
2928 case S_INIT_BLACKLIST:
2930 case S_CONNECT_SENT:
2931 case S_CONNECT_RECV_BLACKLIST:
2933 case S_DISCONNECT_FINISHED:
2934 return GNUNET_TIME_UNIT_FOREVER_REL;
2939 return GNUNET_TIME_UNIT_FOREVER_REL;
2944 * Obtain current address information for the given neighbour.
2947 * @return address currently used
2949 struct GNUNET_HELLO_Address *
2950 GST_neighbour_get_current_address (const struct GNUNET_PeerIdentity *peer)
2952 struct NeighbourMapEntry *n;
2954 n = lookup_neighbour (peer);
2957 return n->primary_address.address;
2962 * Initialize the neighbours subsystem.
2964 * @param cls closure for callbacks
2965 * @param connect_cb function to call if we connect to a peer
2966 * @param disconnect_cb function to call if we disconnect from a peer
2967 * @param peer_address_cb function to call if we change an active address
2971 GST_neighbours_start (void *cls,
2972 GNUNET_TRANSPORT_NotifyConnect connect_cb,
2973 GNUNET_TRANSPORT_NotifyDisconnect disconnect_cb,
2974 GNUNET_TRANSPORT_PeerIterateCallback peer_address_cb)
2977 connect_notify_cb = connect_cb;
2978 disconnect_notify_cb = disconnect_cb;
2979 address_change_cb = peer_address_cb;
2980 neighbours = GNUNET_CONTAINER_multihashmap_create (NEIGHBOUR_TABLE_SIZE);
2985 * Disconnect from the given neighbour.
2988 * @param key hash of neighbour's public key (not used)
2989 * @param value the 'struct NeighbourMapEntry' of the neighbour
2990 * @return GNUNET_OK (continue to iterate)
2993 disconnect_all_neighbours (void *cls, const GNUNET_HashCode * key, void *value)
2995 struct NeighbourMapEntry *n = value;
2997 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2998 "Disconnecting peer `%4s', %s\n",
2999 GNUNET_i2s (&n->id), "SHUTDOWN_TASK");
3006 * Cleanup the neighbours subsystem.
3009 GST_neighbours_stop ()
3011 if (NULL == neighbours)
3013 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
3014 &disconnect_all_neighbours,
3016 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
3018 callback_cls = NULL;
3019 connect_notify_cb = NULL;
3020 disconnect_notify_cb = NULL;
3021 address_change_cb = NULL;
3025 /* end of file gnunet-service-transport_neighbours.c */