2 This file is part of GNUnet.
3 Copyright (C) 2010-2015 Christian Grothoff (and other contributing authors)
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22 * @file transport/gnunet-service-transport_neighbours.c
23 * @brief neighbour management
24 * @author Christian Grothoff
27 #include "gnunet_ats_service.h"
28 #include "gnunet-service-transport_ats.h"
29 #include "gnunet-service-transport_blacklist.h"
30 #include "gnunet-service-transport_clients.h"
31 #include "gnunet-service-transport_neighbours.h"
32 #include "gnunet-service-transport_manipulation.h"
33 #include "gnunet-service-transport_plugins.h"
34 #include "gnunet-service-transport_validation.h"
35 #include "gnunet-service-transport.h"
36 #include "gnunet_peerinfo_service.h"
37 #include "gnunet_constants.h"
38 #include "transport.h"
42 * Size of the neighbour hash map.
44 #define NEIGHBOUR_TABLE_SIZE 256
47 * Time we give plugin to transmit DISCONNECT message before the
48 * neighbour entry self-destructs.
50 #define DISCONNECT_SENT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 500)
53 * How often must a peer violate bandwidth quotas before we start
54 * to simply drop its messages?
56 #define QUOTA_VIOLATION_DROP_THRESHOLD 10
59 * How long are we willing to wait for a response from ATS before timing out?
61 #define ATS_RESPONSE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
64 * How long are we willing to wait for an ACK from the other peer before
65 * giving up on our connect operation?
67 #define SETUP_CONNECTION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
70 * How long are we willing to wait for a successful reconnect if
71 * an existing connection went down? Much shorter than the
72 * usual SETUP_CONNECTION_TIMEOUT as we do not inform the
73 * higher layers about the disconnect during this period.
75 #define FAST_RECONNECT_TIMEOUT GNUNET_TIME_UNIT_SECONDS
78 * Interval to send utilization data
80 #define UTIL_TRANSMISSION_INTERVAL GNUNET_TIME_UNIT_SECONDS
83 * State describing which kind a reply this neighbour should send
88 * We did not receive a SYN message for this neighbour
93 * The neighbour received a SYN message and has to send a SYN_ACK
99 * The neighbour sent a SYN_ACK message and has to send a ACK
106 GNUNET_NETWORK_STRUCT_BEGIN
109 * Message a peer sends to another to indicate that it intends to
110 * setup a connection/session for data exchange. A 'SESSION_SYN'
111 * should be answered with a 'SESSION_SYN_ACK' with the same body
112 * to confirm. A 'SESSION_SYN_ACK' should then be followed with
113 * a 'ACK'. Once the 'ACK' is received, both peers
114 * should be connected.
116 struct TransportSynMessage
119 * Header of type #GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_SYN
120 * or #GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_SYN_ACK
122 struct GNUNET_MessageHeader header;
127 uint32_t reserved GNUNET_PACKED;
130 * Absolute time at the sender. Only the most recent connect
131 * message implies which session is preferred by the sender.
133 struct GNUNET_TIME_AbsoluteNBO timestamp;
139 * Message a peer sends to another when connected to indicate that a
140 * session is in use and the peer is still alive or to respond to a keep alive.
141 * A peer sends a message with type #GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE
142 * to request a message with #GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE.
143 * When the keep alive response with type is received, transport service
144 * will call the respective plugin to update the session timeout
146 struct SessionKeepAliveMessage
149 * Header of type #GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE or
150 * #GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE.
152 struct GNUNET_MessageHeader header;
155 * A nonce to identify the session the keep alive is used for
157 uint32_t nonce GNUNET_PACKED;
161 * Message we send to the other peer to notify him that we intentionally
162 * are disconnecting (to reduce timeouts). This is just a friendly
163 * notification, peers must not rely on always receiving disconnect
166 struct SessionDisconnectMessage
169 * Header of type #GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT
171 struct GNUNET_MessageHeader header;
176 uint32_t reserved GNUNET_PACKED;
179 * Purpose of the signature. Extends over the timestamp.
180 * Purpose should be #GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DISCONNECT.
182 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
185 * Absolute time at the sender. Only the most recent connect
186 * message implies which session is preferred by the sender.
188 struct GNUNET_TIME_AbsoluteNBO timestamp;
191 * Public key of the sender.
193 struct GNUNET_CRYPTO_EddsaPublicKey public_key;
196 * Signature of the peer that sends us the disconnect. Only
197 * valid if the timestamp is AFTER the timestamp from the
198 * corresponding 'SYN' message.
200 struct GNUNET_CRYPTO_EddsaSignature signature;
204 GNUNET_NETWORK_STRUCT_END
208 * For each neighbour we keep a list of messages
209 * that we still want to transmit to the neighbour.
215 * This is a doubly linked list.
217 struct MessageQueue *next;
220 * This is a doubly linked list.
222 struct MessageQueue *prev;
225 * Function to call once we're done.
227 GST_NeighbourSendContinuation cont;
230 * Closure for @e cont
235 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
236 * stuck together in memory. Allocated at the end of this struct.
238 const char *message_buf;
241 * Size of the message buf
243 size_t message_buf_size;
246 * At what time should we fail?
248 struct GNUNET_TIME_Absolute timeout;
254 * A possible address we could use to communicate with a neighbour.
256 struct NeighbourAddress
260 * Active session for this address.
262 struct Session *session;
265 * Network-level address information.
267 struct GNUNET_HELLO_Address *address;
270 * Timestamp of the 'SESSION_CONNECT' message we sent to the other
271 * peer for this address. Use to check that the ACK is in response
272 * to our most recent 'SYN'.
274 struct GNUNET_TIME_Absolute connect_timestamp;
277 * Inbound bandwidth from ATS for this address.
279 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in;
282 * Outbound bandwidth from ATS for this address.
284 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out;
287 * Did we tell ATS that this is our 'active' address?
292 * The current nonce sent in the last keep alive messages
294 uint32_t keep_alive_nonce;
299 * Entry in neighbours.
301 struct NeighbourMapEntry
305 * Head of list of messages we would like to send to this peer;
306 * must contain at most one message per client.
308 struct MessageQueue *messages_head;
311 * Tail of list of messages we would like to send to this peer; must
312 * contain at most one message per client.
314 struct MessageQueue *messages_tail;
317 * Are we currently trying to send a message? If so, which one?
319 struct MessageQueue *is_active;
322 * Primary address we currently use to communicate with the neighbour.
324 struct NeighbourAddress primary_address;
327 * Alternative address currently under consideration for communicating
328 * with the neighbour.
330 struct NeighbourAddress alternative_address;
333 * Identity of this neighbour.
335 struct GNUNET_PeerIdentity id;
338 * Main task that drives this peer (timeouts, keepalives, etc.).
339 * Always runs the 'master_task'.
341 struct GNUNET_SCHEDULER_Task *task;
344 * Task to disconnect neighbour after we received a DISCONNECT message
346 struct GNUNET_SCHEDULER_Task *delayed_disconnect_task;
349 * At what time should we sent the next keep-alive message?
351 struct GNUNET_TIME_Absolute keep_alive_time;
354 * At what time did we sent the last keep-alive message? Used
355 * to calculate round-trip time ("latency").
357 struct GNUNET_TIME_Absolute last_keep_alive_time;
360 * Timestamp we should include in our next SYN_ACK message.
361 * (only valid if 'send_connect_ack' is #GNUNET_YES). Used to build
362 * our SYN_ACK message.
364 struct GNUNET_TIME_Absolute connect_ack_timestamp;
367 * ATS address suggest handle
369 struct GNUNET_ATS_ConnectivitySuggestHandle *suggest_handle;
372 * Time where we should cut the connection (timeout) if we don't
373 * make progress in the state machine (or get a KEEPALIVE_RESPONSE
374 * if we are in #S_CONNECTED).
376 struct GNUNET_TIME_Absolute timeout;
379 * Tracker for inbound bandwidth.
381 struct GNUNET_BANDWIDTH_Tracker in_tracker;
384 * How often has the other peer (recently) violated the inbound
385 * traffic limit? Incremented by 10 per violation, decremented by 1
386 * per non-violation (for each time interval).
388 unsigned int quota_violation_count;
391 * The current state of the peer.
393 enum GNUNET_TRANSPORT_PeerState state;
396 * Did we sent an KEEP_ALIVE message and are we expecting a response?
398 int expect_latency_response;
401 * When a peer wants to connect we have to reply to the 1st SYN message
402 * with a SYN_ACK message. But sometime we cannot send this message
403 * immediately since we do not have an address and then we have to remember
404 * to send this message as soon as we have an address.
406 * Flag to set if we still need to send a SYN_ACK message to the other peer
407 * (once we have an address to use and the peer has been allowed by our
408 * blacklist). Initially set to #ACK_UNDEFINED. Set to #ACK_SEND_SYN_ACK
409 * if we need to send a SYN_ACK. Set to #ACK_SEND_ACK if we did
410 * send a SYN_ACK and should go to #S_CONNECTED upon receiving a
411 * 'ACK' (regardless of what our own state machine might say).
413 enum GST_ACK_State ack_state;
416 * Tracking utilization of outbound bandwidth
418 uint32_t util_total_bytes_sent;
421 * Tracking utilization of inbound bandwidth
423 uint32_t util_total_bytes_recv;
426 * Date of last utilization transmission
428 struct GNUNET_TIME_Absolute last_util_transmission;
433 * Context for blacklist checks and the #try_connect_bl_check_cont()
434 * function. Stores information about ongoing blacklist checks.
436 struct BlackListCheckContext
440 * We keep blacklist checks in a DLL.
442 struct BlackListCheckContext *next;
445 * We keep blacklist checks in a DLL.
447 struct BlackListCheckContext *prev;
450 * Address that is being checked.
452 struct NeighbourAddress na;
455 * Handle to the ongoing blacklist check.
457 struct GST_BlacklistCheck *bc;
462 * Hash map from peer identities to the respective `struct NeighbourMapEntry`.
464 static struct GNUNET_CONTAINER_MultiPeerMap *neighbours;
467 * We keep blacklist checks in a DLL so that we can find
468 * the 'sessions' in their 'struct NeighbourAddress' if
469 * a session goes down.
471 static struct BlackListCheckContext *bc_head;
474 * We keep blacklist checks in a DLL.
476 static struct BlackListCheckContext *bc_tail;
479 * List of pending blacklist checks: head
481 static struct BlacklistCheckSwitchContext *pending_bc_head;
484 * List of pending blacklist checks: tail
486 static struct BlacklistCheckSwitchContext *pending_bc_tail;
489 * counter for connected neighbours
491 static unsigned int neighbours_connected;
494 * Number of bytes we have currently queued for transmission.
496 static unsigned long long bytes_in_send_queue;
499 * Task transmitting utilization data
501 static struct GNUNET_SCHEDULER_Task *util_transmission_tk;
505 * Convert the given ACK state to a string.
508 * @return corresponding human-readable string
511 print_ack_state (enum GST_ACK_State s)
516 case ACK_SEND_SYN_ACK:
517 return "SEND_SYN_ACK";
528 * Notify our clients that another peer connected to us.
530 * @param peer the peer that connected
531 * @param bandwidth_in inbound bandwidth in NBO
532 * @param bandwidth_out outbound bandwidth in NBO
535 neighbours_connect_notification (const struct GNUNET_PeerIdentity *peer,
536 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
537 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
539 size_t len = sizeof(struct ConnectInfoMessage);
540 char buf[len] GNUNET_ALIGN;
541 struct ConnectInfoMessage *connect_msg = (struct ConnectInfoMessage *) buf;
543 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
544 "We are now connected to peer `%s'\n",
546 connect_msg->header.size = htons (sizeof(buf));
547 connect_msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
548 connect_msg->id = *peer;
549 connect_msg->quota_in = bandwidth_in;
550 connect_msg->quota_out = bandwidth_out;
551 GST_clients_broadcast (&connect_msg->header, GNUNET_NO);
556 * Notify our clients (and manipulation) that a peer disconnected from
559 * @param peer the peer that disconnected
562 neighbours_disconnect_notification (const struct GNUNET_PeerIdentity *peer)
564 struct DisconnectInfoMessage disconnect_msg;
566 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
567 "Peer `%s' disconnected\n",
569 GST_manipulation_peer_disconnect (peer);
570 disconnect_msg.header.size = htons (sizeof(struct DisconnectInfoMessage));
571 disconnect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
572 disconnect_msg.reserved = htonl (0);
573 disconnect_msg.peer = *peer;
574 GST_clients_broadcast (&disconnect_msg.header,
580 * Notify transport clients that a neighbour peer changed its active
583 * @param peer identity of the peer
584 * @param address address possibly NULL if peer is not connected
585 * @param state current state this peer is in
586 * @param state_timeout timeout for the current state of the peer
587 * @param bandwidth_in bandwidth assigned inbound, 0 on disconnect
588 * @param bandwidth_out bandwidth assigned outbound, 0 on disconnect
591 neighbours_changed_notification (const struct GNUNET_PeerIdentity *peer,
592 const struct GNUNET_HELLO_Address *address,
593 enum GNUNET_TRANSPORT_PeerState state,
594 struct GNUNET_TIME_Absolute state_timeout,
595 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
596 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
598 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
599 "Notifying about change for peer `%s' with address `%s' in state `%s' timing out at %s\n",
601 GST_plugins_a2s (address),
602 GNUNET_TRANSPORT_ps2s (state),
603 GNUNET_STRINGS_absolute_time_to_string (state_timeout));
604 /* FIXME: include bandwidth in notification! */
605 GST_clients_broadcast_peer_notification (peer,
613 * Lookup a neighbour entry in the neighbours hash map.
615 * @param pid identity of the peer to look up
616 * @return the entry, NULL if there is no existing record
618 static struct NeighbourMapEntry *
619 lookup_neighbour (const struct GNUNET_PeerIdentity *pid)
621 if (NULL == neighbours)
623 return GNUNET_CONTAINER_multipeermap_get (neighbours, pid);
628 * Test if we're connected to the given peer.
630 * @param n neighbour entry of peer to test
631 * @return #GNUNET_YES if we are connected, #GNUNET_NO if not
634 test_connected (struct NeighbourMapEntry *n)
638 return GNUNET_TRANSPORT_is_connected (n->state);
643 * Send information about a new outbound quota to our clients.
645 * @param target affected peer
646 * @param quota new quota
649 send_outbound_quota (const struct GNUNET_PeerIdentity *target,
650 struct GNUNET_BANDWIDTH_Value32NBO quota)
652 struct QuotaSetMessage q_msg;
654 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
655 "Sending outbound quota of %u Bps for peer `%s' to all clients\n",
656 ntohl (quota.value__),
657 GNUNET_i2s (target));
658 q_msg.header.size = htons (sizeof (struct QuotaSetMessage));
659 q_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
661 q_msg.peer = (*target);
662 GST_clients_broadcast (&q_msg.header, GNUNET_NO);
667 * We don't need a given neighbour address any more.
668 * Release its resources and give appropriate notifications
669 * to ATS and other subsystems.
671 * @param na address we are done with; @a na itself must NOT be 'free'd, only the contents!
674 free_address (struct NeighbourAddress *na)
676 if (GNUNET_YES == na->ats_active)
677 GST_validation_set_address_use (na->address,
679 if (NULL != na->address)
681 GST_ats_block_address (na->address,
683 GNUNET_HELLO_address_free (na->address);
686 na->bandwidth_in = GNUNET_BANDWIDTH_value_init (0);
687 na->bandwidth_out = GNUNET_BANDWIDTH_value_init (0);
688 na->ats_active = GNUNET_NO;
689 na->keep_alive_nonce = 0;
695 * Master task run for every neighbour. Performs all of the time-related
696 * activities (keep alive, send next message, disconnect if idle, finish
697 * clean up after disconnect).
699 * @param cls the `struct NeighbourMapEntry` for which we are running
700 * @param tc scheduler context (unused)
703 master_task (void *cls,
704 const struct GNUNET_SCHEDULER_TaskContext *tc);
708 * Set net state and state timeout for this neighbour and notify monitoring
710 * @param n the respective neighbour
711 * @param s the new state
712 * @param timeout the new timeout
715 set_state_and_timeout (struct NeighbourMapEntry *n,
716 enum GNUNET_TRANSPORT_PeerState s,
717 struct GNUNET_TIME_Absolute timeout)
719 if (GNUNET_TRANSPORT_is_connected (s) &&
720 ! GNUNET_TRANSPORT_is_connected (n->state) )
722 neighbours_connect_notification (&n->id,
723 n->primary_address.bandwidth_in,
724 n->primary_address.bandwidth_out);
725 GNUNET_STATISTICS_set (GST_stats,
726 gettext_noop ("# peers connected"),
727 ++neighbours_connected,
730 if (! GNUNET_TRANSPORT_is_connected (s) &&
731 GNUNET_TRANSPORT_is_connected (n->state) )
733 GNUNET_STATISTICS_set (GST_stats,
734 gettext_noop ("# peers connected"),
735 --neighbours_connected,
737 neighbours_disconnect_notification (&n->id);
740 if ( (timeout.abs_value_us < n->timeout.abs_value_us) &&
743 /* new timeout is earlier, reschedule master task */
744 GNUNET_SCHEDULER_cancel (n->task);
745 n->task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining (timeout),
749 n->timeout = timeout;
750 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
751 "Neighbour `%s' changed state to %s with timeout %s\n",
753 GNUNET_TRANSPORT_ps2s(s),
754 GNUNET_STRINGS_absolute_time_to_string (timeout));
755 neighbours_changed_notification (&n->id,
756 n->primary_address.address,
759 n->primary_address.bandwidth_in,
760 n->primary_address.bandwidth_out);
765 * Initialize the alternative address of a neighbour
767 * @param n the neighbour
768 * @param address address of the other peer, NULL if other peer
770 * @param session session to use (or NULL, in which case an
771 * address must be setup)
772 * @param bandwidth_in inbound quota to be used when connection is up
773 * @param bandwidth_out outbound quota to be used when connection is up
776 set_alternative_address (struct NeighbourMapEntry *n,
777 const struct GNUNET_HELLO_Address *address,
778 struct Session *session,
779 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
780 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
782 struct GNUNET_TRANSPORT_PluginFunctions *papi;
784 if (NULL == (papi = GST_plugins_find (address->transport_name)))
789 if (session == n->alternative_address.session)
791 n->alternative_address.bandwidth_in = bandwidth_in;
792 n->alternative_address.bandwidth_out = bandwidth_out;
795 if (NULL != n->alternative_address.address)
797 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
798 "Replacing existing alternative address with another one\n");
799 free_address (&n->alternative_address);
802 session = papi->get_session (papi->cls,
806 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
807 "Failed to obtain new session for peer `%s' and address '%s'\n",
808 GNUNET_i2s (&address->peer),
809 GST_plugins_a2s (address));
810 GNUNET_STATISTICS_update (GST_stats,
811 gettext_noop ("# session creation failed"),
816 GST_ats_new_session (address,
818 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
819 "Neighbour `%s' configured alternative address %s\n",
821 GST_plugins_a2s(address));
823 n->alternative_address.address = GNUNET_HELLO_address_copy (address);
824 n->alternative_address.bandwidth_in = bandwidth_in;
825 n->alternative_address.bandwidth_out = bandwidth_out;
826 n->alternative_address.session = session;
827 n->alternative_address.ats_active = GNUNET_NO;
828 n->alternative_address.keep_alive_nonce = 0;
833 * Initialize the primary address of a neighbour
835 * @param n the neighbour
836 * @param address address of the other peer, NULL if other peer
838 * @param session session to use (or NULL, in which case an
839 * address must be setup)
840 * @param bandwidth_in inbound quota to be used when connection is up
841 * @param bandwidth_out outbound quota to be used when connection is up
844 set_primary_address (struct NeighbourMapEntry *n,
845 const struct GNUNET_HELLO_Address *address,
846 struct Session *session,
847 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
848 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
850 if (session == n->primary_address.session)
852 GST_validation_set_address_use (n->primary_address.address,
854 if (n->primary_address.bandwidth_in.value__ != bandwidth_in.value__)
856 n->primary_address.bandwidth_in = bandwidth_in;
857 GST_neighbours_set_incoming_quota (&address->peer,
860 if (n->primary_address.bandwidth_out.value__ != bandwidth_out.value__)
862 n->primary_address.bandwidth_out = bandwidth_out;
863 send_outbound_quota (&address->peer,
868 if ( (NULL != n->primary_address.address) &&
869 (0 == GNUNET_HELLO_address_cmp (address,
870 n->primary_address.address)) )
878 GST_ats_block_address (address,
882 if (NULL != n->primary_address.address)
884 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
885 "Replacing existing primary address with another one\n");
886 free_address (&n->primary_address);
888 n->primary_address.address = GNUNET_HELLO_address_copy (address);
889 n->primary_address.bandwidth_in = bandwidth_in;
890 n->primary_address.bandwidth_out = bandwidth_out;
891 n->primary_address.session = session;
892 n->primary_address.keep_alive_nonce = 0;
893 /* subsystems about address use */
894 GST_validation_set_address_use (n->primary_address.address,
896 GST_neighbours_set_incoming_quota (&address->peer,
898 send_outbound_quota (&address->peer,
900 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
901 "Neighbour `%s' switched to address `%s'\n",
903 GST_plugins_a2s(address));
905 neighbours_changed_notification (&n->id,
906 n->primary_address.address,
909 n->primary_address.bandwidth_in,
910 n->primary_address.bandwidth_out);
915 * Clear the primary address of a neighbour since this address is not
916 * valid anymore and notify monitoring about it
918 * @param n the neighbour
921 unset_primary_address (struct NeighbourMapEntry *n)
923 /* Notify monitoring about change */
924 if (NULL == n->primary_address.address)
926 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
927 "Disabling primary address\n");
928 neighbours_changed_notification (&n->id,
929 n->primary_address.address,
932 GNUNET_BANDWIDTH_value_init (0),
933 GNUNET_BANDWIDTH_value_init (0));
934 free_address (&n->primary_address);
939 * Free a neighbour map entry.
941 * @param n entry to free
944 free_neighbour (struct NeighbourMapEntry *n)
946 struct MessageQueue *mq;
948 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
949 "Freeing neighbour state of peer `%s'\n",
950 GNUNET_i2s (&n->id));
951 n->is_active = NULL; /* always free'd by its own continuation! */
953 /* fail messages currently in the queue */
954 while (NULL != (mq = n->messages_head))
956 GNUNET_CONTAINER_DLL_remove (n->messages_head,
959 if (NULL != mq->cont)
960 mq->cont (mq->cont_cls,
962 mq->message_buf_size,
966 /* Mark peer as disconnected */
967 set_state_and_timeout (n,
968 GNUNET_TRANSPORT_PS_DISCONNECT_FINISHED,
969 GNUNET_TIME_UNIT_FOREVER_ABS);
970 /* free addresses and mark as unused */
971 unset_primary_address (n);
973 if (NULL != n->alternative_address.address)
975 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
976 "Cleaning up alternative address\n");
977 free_address (&n->alternative_address);
979 GNUNET_assert (GNUNET_YES ==
980 GNUNET_CONTAINER_multipeermap_remove (neighbours,
983 /* Cancel address requests for this peer */
984 if (NULL != n->suggest_handle)
986 GNUNET_ATS_connectivity_suggest_cancel (n->suggest_handle);
987 n->suggest_handle = NULL;
990 /* Cancel the disconnect task */
991 if (NULL != n->delayed_disconnect_task)
993 GNUNET_SCHEDULER_cancel (n->delayed_disconnect_task);
994 n->delayed_disconnect_task = NULL;
997 /* Cancel the master task */
1000 GNUNET_SCHEDULER_cancel (n->task);
1003 /* free rest of memory */
1009 * Transmit a message using the current session of the given
1012 * @param n entry for the recipient
1013 * @param msgbuf buffer to transmit
1014 * @param msgbuf_size number of bytes in @a msgbuf buffer
1015 * @param priority transmission priority
1016 * @param timeout transmission timeout
1017 * @param use_keepalive_timeout #GNUNET_YES to use plugin-specific keep-alive
1018 * timeout (@a timeout is ignored in that case), #GNUNET_NO otherwise
1019 * @param cont continuation to call when finished (can be NULL)
1020 * @param cont_cls closure for @a cont
1021 * @return timeout (copy of @a timeout or a calculated one if
1022 * @a use_keepalive_timeout is #GNUNET_YES.
1024 static struct GNUNET_TIME_Relative
1025 send_with_session (struct NeighbourMapEntry *n,
1029 struct GNUNET_TIME_Relative timeout,
1030 unsigned int use_keepalive_timeout,
1031 GNUNET_TRANSPORT_TransmitContinuation cont,
1034 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1035 struct GNUNET_TIME_Relative result = GNUNET_TIME_UNIT_FOREVER_REL;
1037 GNUNET_assert (NULL != n->primary_address.session);
1038 if ( ((NULL == (papi = GST_plugins_find (n->primary_address.address->transport_name)) ||
1039 (-1 == papi->send (papi->cls,
1040 n->primary_address.session,
1044 (result = (GNUNET_NO == use_keepalive_timeout) ? timeout :
1045 GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1046 papi->query_keepalive_factor (papi->cls))),
1055 GST_neighbours_notify_data_sent (n->primary_address.address,
1056 n->primary_address.session,
1058 GNUNET_break (NULL != papi);
1064 * Function called when the 'DISCONNECT' message has been sent by the
1065 * plugin. Frees the neighbour --- if the entry still exists.
1068 * @param target identity of the neighbour that was disconnected
1069 * @param result #GNUNET_OK if the disconnect got out successfully
1070 * @param payload bytes payload
1071 * @param physical bytes on wire
1074 send_disconnect_cont (void *cls,
1075 const struct GNUNET_PeerIdentity *target,
1080 struct NeighbourMapEntry *n;
1082 n = lookup_neighbour (target);
1084 return; /* already gone */
1085 if (GNUNET_TRANSPORT_PS_DISCONNECT != n->state)
1086 return; /* have created a fresh entry since */
1087 if (NULL != n->task)
1088 GNUNET_SCHEDULER_cancel (n->task);
1089 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1094 * Transmit a DISCONNECT message to the other peer.
1096 * @param n neighbour to send DISCONNECT message.
1099 send_disconnect (struct NeighbourMapEntry *n)
1101 struct SessionDisconnectMessage disconnect_msg;
1103 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1104 "Sending DISCONNECT message to peer `%4s'\n",
1105 GNUNET_i2s (&n->id));
1106 disconnect_msg.header.size = htons (sizeof (struct SessionDisconnectMessage));
1107 disconnect_msg.header.type =
1108 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1109 disconnect_msg.reserved = htonl (0);
1110 disconnect_msg.purpose.size =
1111 htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
1112 sizeof (struct GNUNET_CRYPTO_EddsaPublicKey) +
1113 sizeof (struct GNUNET_TIME_AbsoluteNBO));
1114 disconnect_msg.purpose.purpose =
1115 htonl (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT);
1116 disconnect_msg.timestamp =
1117 GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1118 disconnect_msg.public_key = GST_my_identity.public_key;
1119 GNUNET_assert (GNUNET_OK ==
1120 GNUNET_CRYPTO_eddsa_sign (GST_my_private_key,
1121 &disconnect_msg.purpose,
1122 &disconnect_msg.signature));
1124 (void) send_with_session (n,
1126 sizeof (disconnect_msg),
1128 GNUNET_TIME_UNIT_FOREVER_REL,
1130 &send_disconnect_cont,
1132 GNUNET_STATISTICS_update (GST_stats,
1133 gettext_noop ("# DISCONNECT messages sent"),
1140 * Disconnect from the given neighbour, clean up the record.
1142 * @param n neighbour to disconnect from
1145 disconnect_neighbour (struct NeighbourMapEntry *n)
1147 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1148 "Disconnecting from peer %s in state %s\n",
1149 GNUNET_i2s (&n->id),
1150 GNUNET_TRANSPORT_ps2s (n->state));
1151 /* depending on state, notify neighbour and/or upper layers of this peer
1155 case GNUNET_TRANSPORT_PS_NOT_CONNECTED:
1156 case GNUNET_TRANSPORT_PS_INIT_ATS:
1157 /* other peer is completely unaware of us, no need to send DISCONNECT */
1160 case GNUNET_TRANSPORT_PS_SYN_SENT:
1161 send_disconnect (n);
1162 set_state_and_timeout (n,
1163 GNUNET_TRANSPORT_PS_DISCONNECT,
1164 GNUNET_TIME_UNIT_FOREVER_ABS);
1166 case GNUNET_TRANSPORT_PS_SYN_RECV_ATS:
1167 /* we never ACK'ed the other peer's request, no need to send DISCONNECT */
1170 case GNUNET_TRANSPORT_PS_SYN_RECV_ACK:
1171 /* we DID ACK the other peer's request, must send DISCONNECT */
1172 send_disconnect (n);
1173 set_state_and_timeout (n,
1174 GNUNET_TRANSPORT_PS_DISCONNECT,
1175 GNUNET_TIME_UNIT_FOREVER_ABS);
1177 case GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT:
1178 case GNUNET_TRANSPORT_PS_CONNECTED:
1179 case GNUNET_TRANSPORT_PS_RECONNECT_SENT:
1180 /* we are currently connected, need to send disconnect and do
1181 internal notifications and update statistics */
1182 send_disconnect (n);
1183 set_state_and_timeout (n,
1184 GNUNET_TRANSPORT_PS_DISCONNECT,
1185 GNUNET_TIME_UNIT_FOREVER_ABS);
1187 case GNUNET_TRANSPORT_PS_RECONNECT_ATS:
1188 /* Disconnecting while waiting for an ATS address to reconnect,
1189 * cannot send DISCONNECT */
1192 case GNUNET_TRANSPORT_PS_DISCONNECT:
1193 /* already disconnected, ignore */
1195 case GNUNET_TRANSPORT_PS_DISCONNECT_FINISHED:
1196 /* already cleaned up, how did we get here!? */
1200 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1201 "Unhandled state `%s'\n",
1202 GNUNET_TRANSPORT_ps2s (n->state));
1206 /* schedule timeout to clean up */
1207 if (NULL != n->task)
1208 GNUNET_SCHEDULER_cancel (n->task);
1209 n->task = GNUNET_SCHEDULER_add_delayed (DISCONNECT_SENT_TIMEOUT,
1216 * We're done with our transmission attempt, continue processing.
1218 * @param cls the `struct MessageQueue` of the message
1219 * @param receiver intended receiver
1220 * @param success whether it worked or not
1221 * @param size_payload bytes payload sent
1222 * @param physical bytes sent on wire
1225 transmit_send_continuation (void *cls,
1226 const struct GNUNET_PeerIdentity *receiver,
1228 size_t size_payload,
1231 struct MessageQueue *mq = cls;
1232 struct NeighbourMapEntry *n;
1234 if (NULL == (n = lookup_neighbour (receiver)))
1236 if (NULL != mq->cont)
1237 mq->cont (mq->cont_cls,
1238 GNUNET_SYSERR /* not connected */,
1242 return; /* disconnect or other error while transmitting, can happen */
1244 if (n->is_active == mq)
1246 /* this is still "our" neighbour, remove us from its queue
1247 and allow it to send the next message now */
1248 n->is_active = NULL;
1249 if (NULL != n->task)
1250 GNUNET_SCHEDULER_cancel (n->task);
1251 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1253 if (bytes_in_send_queue < mq->message_buf_size)
1255 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1256 "Bytes_in_send_queue `%u', Message_size %u, result: %s, payload %u, on wire %u\n",
1257 bytes_in_send_queue,
1258 mq->message_buf_size,
1259 (GNUNET_OK == success) ? "OK" : "FAIL",
1265 GNUNET_break (size_payload == mq->message_buf_size);
1266 bytes_in_send_queue -= mq->message_buf_size;
1267 GNUNET_STATISTICS_set (GST_stats,
1269 ("# bytes in message queue for other peers"),
1270 bytes_in_send_queue, GNUNET_NO);
1271 if (GNUNET_OK == success)
1272 GNUNET_STATISTICS_update (GST_stats,
1274 ("# messages transmitted to other peers"),
1277 GNUNET_STATISTICS_update (GST_stats,
1279 ("# transmission failures for messages to other peers"),
1281 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1282 "Sending message to `%s' of type %u with %u bytes was a %s\n",
1283 GNUNET_i2s (receiver),
1284 ntohs (((struct GNUNET_MessageHeader *) mq->message_buf)->type),
1285 mq->message_buf_size,
1286 (success == GNUNET_OK) ? "success" : "FAILURE");
1287 if (NULL != mq->cont)
1288 mq->cont (mq->cont_cls, success, size_payload, physical);
1294 * Check the message list for the given neighbour and if we can
1295 * send a message, do so. This function should only be called
1296 * if the connection is at least generally ready for transmission.
1297 * While we will only send one message at a time, no bandwidth
1298 * quota management is performed here. If a message was given to
1299 * the plugin, the continuation will automatically re-schedule
1300 * the 'master' task once the next message might be transmitted.
1302 * @param n target peer for which to transmit
1305 try_transmission_to_peer (struct NeighbourMapEntry *n)
1307 struct MessageQueue *mq;
1308 struct GNUNET_TIME_Relative timeout;
1310 if (NULL == n->primary_address.address)
1312 /* no address, why are we here? */
1316 if ((0 == n->primary_address.address->address_length) &&
1317 (NULL == n->primary_address.session))
1319 /* no address, why are we here? */
1323 if (NULL != n->is_active)
1325 /* transmission already pending */
1329 /* timeout messages from the queue that are past their due date */
1330 while (NULL != (mq = n->messages_head))
1332 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1333 if (timeout.rel_value_us > 0)
1335 GNUNET_STATISTICS_update (GST_stats,
1336 gettext_noop ("# messages timed out while in transport queue"),
1339 GNUNET_CONTAINER_DLL_remove (n->messages_head,
1343 transmit_send_continuation (mq,
1346 mq->message_buf_size,
1350 return; /* no more messages */
1351 GNUNET_CONTAINER_DLL_remove (n->messages_head,
1356 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1357 "Giving message with %u bytes to plugin session %p\n",
1358 mq->message_buf_size,
1359 n->primary_address.session);
1360 (void) send_with_session (n,
1362 mq->message_buf_size,
1366 &transmit_send_continuation,
1372 * Send keepalive message to the neighbour. Must only be called
1373 * if we are on 'connected' state or while trying to switch addresses.
1374 * Will internally determine if a keepalive is truly needed (so can
1375 * always be called).
1377 * @param n neighbour that went idle and needs a keepalive
1380 send_keepalive (struct NeighbourMapEntry *n)
1382 struct SessionKeepAliveMessage m;
1383 struct GNUNET_TIME_Relative timeout;
1386 GNUNET_assert ((GNUNET_TRANSPORT_PS_CONNECTED == n->state) ||
1387 (GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT == n->state));
1388 if (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time).rel_value_us > 0)
1389 return; /* no keepalive needed at this time */
1391 nonce = 0; /* 0 indicates 'not set' */
1393 nonce = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
1396 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1397 "Sending KEEPALIVE to peer `%s' with nonce %u\n",
1398 GNUNET_i2s (&n->id),
1400 m.header.size = htons (sizeof (struct SessionKeepAliveMessage));
1401 m.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
1402 m.nonce = htonl (nonce);
1404 timeout = send_with_session (n,
1407 UINT32_MAX /* priority */,
1408 GNUNET_TIME_UNIT_FOREVER_REL,
1411 GNUNET_STATISTICS_update (GST_stats,
1412 gettext_noop ("# KEEPALIVES sent"),
1415 n->primary_address.keep_alive_nonce = nonce;
1416 n->expect_latency_response = GNUNET_YES;
1417 n->last_keep_alive_time = GNUNET_TIME_absolute_get ();
1418 n->keep_alive_time = GNUNET_TIME_relative_to_absolute (timeout);
1423 * Keep the connection to the given neighbour alive longer,
1424 * we received a KEEPALIVE (or equivalent); send a response.
1426 * @param neighbour neighbour to keep alive (by sending keep alive response)
1427 * @param m the keep alive message containing the nonce to respond to
1430 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour,
1431 const struct GNUNET_MessageHeader *m)
1433 struct NeighbourMapEntry *n;
1434 const struct SessionKeepAliveMessage *msg_in;
1435 struct SessionKeepAliveMessage msg;
1437 if (sizeof (struct SessionKeepAliveMessage) != ntohs (m->size))
1439 GNUNET_break_op (0);
1443 msg_in = (const struct SessionKeepAliveMessage *) m;
1444 if (NULL == (n = lookup_neighbour (neighbour)))
1446 GNUNET_STATISTICS_update (GST_stats,
1448 ("# KEEPALIVE messages discarded (peer unknown)"),
1452 if (NULL == n->primary_address.session)
1454 GNUNET_STATISTICS_update (GST_stats,
1456 ("# KEEPALIVE messages discarded (no session)"),
1461 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1462 "Received KEEPALIVE request from peer `%s' with nonce %u\n",
1463 GNUNET_i2s (&n->id),
1464 ntohl (msg_in->nonce));
1465 GNUNET_STATISTICS_update (GST_stats,
1466 gettext_noop ("# KEEPALIVES received in good order"),
1470 /* send reply to allow neighbour to measure latency */
1471 msg.header.size = htons (sizeof (struct SessionKeepAliveMessage));
1472 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE);
1473 msg.nonce = msg_in->nonce;
1474 (void) send_with_session (n,
1476 sizeof (struct SessionKeepAliveMessage),
1477 UINT32_MAX /* priority */,
1478 GNUNET_TIME_UNIT_FOREVER_REL,
1485 * We received a KEEP_ALIVE_RESPONSE message and use this to calculate
1486 * latency to this peer. Pass the updated information (existing ats
1487 * plus calculated latency) to ATS.
1489 * @param neighbour neighbour to keep alive
1490 * @param m the message containing the keep alive response
1493 GST_neighbours_keepalive_response (const struct GNUNET_PeerIdentity *neighbour,
1494 const struct GNUNET_MessageHeader *m)
1496 struct NeighbourMapEntry *n;
1497 const struct SessionKeepAliveMessage *msg;
1498 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1499 struct GNUNET_TIME_Relative latency;
1501 if (sizeof (struct SessionKeepAliveMessage) != ntohs (m->size))
1503 GNUNET_break_op (0);
1507 msg = (const struct SessionKeepAliveMessage *) m;
1508 if (NULL == (n = lookup_neighbour (neighbour)))
1510 GNUNET_STATISTICS_update (GST_stats,
1511 gettext_noop ("# KEEPALIVE_RESPONSE messages discarded (not connected)"),
1516 if ( (GNUNET_TRANSPORT_PS_CONNECTED != n->state) ||
1517 (GNUNET_YES != n->expect_latency_response) )
1519 GNUNET_STATISTICS_update (GST_stats,
1520 gettext_noop ("# KEEPALIVE_RESPONSE messages discarded (not expected)"),
1525 if (NULL == n->primary_address.address)
1527 GNUNET_STATISTICS_update (GST_stats,
1528 gettext_noop ("# KEEPALIVE_RESPONSE messages discarded (address changed)"),
1533 if (n->primary_address.keep_alive_nonce != ntohl (msg->nonce))
1535 if (0 == n->primary_address.keep_alive_nonce)
1536 GNUNET_STATISTICS_update (GST_stats,
1537 gettext_noop ("# KEEPALIVE_RESPONSE messages discarded (no nonce)"),
1541 GNUNET_STATISTICS_update (GST_stats,
1542 gettext_noop ("# KEEPALIVE_RESPONSE messages discarded (wrong nonce)"),
1547 GNUNET_STATISTICS_update (GST_stats,
1548 gettext_noop ("# KEEPALIVE_RESPONSE messages received in good order"),
1553 /* Update session timeout here */
1554 if (NULL != (papi = GST_plugins_find (n->primary_address.address->transport_name)))
1556 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1557 "Updating session for peer `%s' for session %p\n",
1558 GNUNET_i2s (&n->id),
1559 n->primary_address.session);
1560 papi->update_session_timeout (papi->cls,
1562 n->primary_address.session);
1569 n->primary_address.keep_alive_nonce = 0;
1570 n->expect_latency_response = GNUNET_NO;
1571 set_state_and_timeout (n,
1573 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
1575 latency = GNUNET_TIME_absolute_get_duration (n->last_keep_alive_time);
1576 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1577 "Received KEEPALIVE_RESPONSE from peer `%s', latency is %s\n",
1578 GNUNET_i2s (&n->id),
1579 GNUNET_STRINGS_relative_time_to_string (latency,
1581 GST_ats_update_delay (n->primary_address.address,
1582 GNUNET_TIME_relative_divide (latency,
1588 * We have received a message from the given sender. How long should
1589 * we delay before receiving more? (Also used to keep the peer marked
1592 * @param sender sender of the message
1593 * @param size size of the message
1594 * @param do_forward set to #GNUNET_YES if the message should be forwarded to clients
1595 * #GNUNET_NO if the neighbour is not connected or violates the quota,
1596 * #GNUNET_SYSERR if the connection is not fully up yet
1597 * @return how long to wait before reading more from this sender
1599 struct GNUNET_TIME_Relative
1600 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity *sender,
1604 struct NeighbourMapEntry *n;
1605 struct GNUNET_TIME_Relative ret;
1607 if (NULL == neighbours)
1609 *do_forward = GNUNET_NO;
1610 return GNUNET_TIME_UNIT_FOREVER_REL; /* This can happen during shutdown */
1612 if (NULL == (n = lookup_neighbour (sender)))
1614 GST_neighbours_try_connect (sender);
1615 if (NULL == (n = lookup_neighbour (sender)))
1617 GNUNET_STATISTICS_update (GST_stats,
1619 ("# messages discarded due to lack of neighbour record"),
1621 *do_forward = GNUNET_NO;
1622 return GNUNET_TIME_UNIT_ZERO;
1625 if (! test_connected (n))
1627 *do_forward = GNUNET_SYSERR;
1628 return GNUNET_TIME_UNIT_ZERO;
1630 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
1632 n->quota_violation_count++;
1633 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1634 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
1635 n->in_tracker.available_bytes_per_s__,
1636 n->quota_violation_count);
1637 /* Discount 32k per violation */
1638 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
1642 if (n->quota_violation_count > 0)
1644 /* try to add 32k back */
1645 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
1646 n->quota_violation_count--;
1649 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
1651 GNUNET_STATISTICS_update (GST_stats,
1653 ("# bandwidth quota violations by other peers"),
1655 *do_forward = GNUNET_NO;
1656 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
1658 *do_forward = GNUNET_YES;
1659 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 32 * 1024);
1660 if (ret.rel_value_us > 0)
1662 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1663 "Throttling read (%lld bytes excess at %u b/s), waiting %s before reading more.\n",
1664 (long long) n->in_tracker.consumption_since_last_update__,
1665 (unsigned int) n->in_tracker.available_bytes_per_s__,
1666 GNUNET_STRINGS_relative_time_to_string (ret, GNUNET_YES));
1667 GNUNET_STATISTICS_update (GST_stats,
1668 gettext_noop ("# ms throttling suggested"),
1669 (int64_t) ret.rel_value_us / 1000LL,
1677 * Transmit a message to the given target using the active connection.
1679 * @param target destination
1680 * @param msg message to send
1681 * @param msg_size number of bytes in msg
1682 * @param timeout when to fail with timeout
1683 * @param cont function to call when done
1684 * @param cont_cls closure for @a cont
1687 GST_neighbours_send (const struct GNUNET_PeerIdentity *target,
1690 struct GNUNET_TIME_Relative timeout,
1691 GST_NeighbourSendContinuation cont,
1694 struct NeighbourMapEntry *n;
1695 struct MessageQueue *mq;
1697 /* All ove these cases should never happen; they are all API violations.
1698 But we check anyway, just to be sure. */
1699 if (NULL == (n = lookup_neighbour (target)))
1709 if (GNUNET_YES != test_connected (n))
1719 bytes_in_send_queue += msg_size;
1720 GNUNET_STATISTICS_set (GST_stats,
1722 ("# bytes in message queue for other peers"),
1723 bytes_in_send_queue, GNUNET_NO);
1724 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
1726 mq->cont_cls = cont_cls;
1727 memcpy (&mq[1], msg, msg_size);
1728 mq->message_buf = (const char *) &mq[1];
1729 mq->message_buf_size = msg_size;
1730 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1732 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1733 "Enqueueing %u bytes to send to peer %s\n",
1735 GNUNET_i2s (target));
1736 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head,
1739 if (NULL != n->task)
1740 GNUNET_SCHEDULER_cancel (n->task);
1741 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1746 * Continuation called from our attempt to transmitted our
1747 * #GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_SYN to the specified @a
1748 * target. Continue processing based on the @a result. Specifically,
1749 * if we failed to transmit, discard the address we used.
1752 * @param target which peer received the transmission
1753 * @param result #GNUNET_OK if sending worked
1754 * @param size_payload how many bytes of payload were sent (ignored)
1755 * @param size_on_wire how much bandwidth was consumed on the wire (ignored)
1758 send_session_syn_cont (void *cls,
1759 const struct GNUNET_PeerIdentity *target,
1761 size_t size_payload,
1762 size_t size_on_wire)
1764 struct NeighbourMapEntry *n;
1766 n = lookup_neighbour (target);
1769 /* SYN continuation was called after neighbor was freed,
1770 * for example due to a time out for the state or the session
1771 * used was already terminated: nothing to do here... */
1775 if ( (GNUNET_TRANSPORT_PS_SYN_SENT != n->state) &&
1776 (GNUNET_TRANSPORT_PS_RECONNECT_SENT != n->state) &&
1777 (GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT != n->state))
1779 /* SYN continuation was called after neighbor changed state,
1780 * for example due to a time out for the state or the session
1781 * used was already terminated: nothing to do here... */
1784 if (GNUNET_OK == result)
1787 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1788 _("Failed to send SYN message to peer `%s'\n"),
1789 GNUNET_i2s (target));
1791 case GNUNET_TRANSPORT_PS_SYN_SENT:
1792 /* Remove address and request an additional one */
1793 unset_primary_address (n);
1794 set_state_and_timeout (n,
1795 GNUNET_TRANSPORT_PS_INIT_ATS,
1796 GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT));
1798 case GNUNET_TRANSPORT_PS_RECONNECT_SENT:
1799 /* Remove address and request an additional one */
1800 unset_primary_address (n);
1801 set_state_and_timeout (n,
1802 GNUNET_TRANSPORT_PS_RECONNECT_ATS,
1803 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
1805 case GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT:
1806 /* Remove address and request and go back to primary address */
1807 GNUNET_STATISTICS_update (GST_stats,
1808 gettext_noop ("# Failed attempts to switch addresses (failed to send SYN CONT)"),
1811 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1812 "Switch failed, cleaning up alternative address\n");
1813 free_address (&n->alternative_address);
1814 set_state_and_timeout (n,
1815 GNUNET_TRANSPORT_PS_CONNECTED,
1816 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
1819 disconnect_neighbour (n);
1826 * Send a SYN message via the given address.
1828 * @param na address to use
1831 send_syn (struct NeighbourAddress *na)
1833 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1834 struct TransportSynMessage connect_msg;
1835 struct NeighbourMapEntry *n;
1837 GNUNET_assert (NULL != na->session);
1838 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1839 "Sending SYN message to peer `%s' at %s\n",
1840 GNUNET_i2s (&na->address->peer),
1841 GST_plugins_a2s (na->address));
1843 papi = GST_plugins_find (na->address->transport_name);
1844 GNUNET_assert (NULL != papi);
1845 GNUNET_STATISTICS_update (GST_stats,
1847 ("# SYN messages sent"),
1849 na->connect_timestamp = GNUNET_TIME_absolute_get ();
1850 connect_msg.header.size = htons (sizeof (struct TransportSynMessage));
1851 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_SYN);
1852 connect_msg.reserved = htonl (0);
1853 connect_msg.timestamp = GNUNET_TIME_absolute_hton (na->connect_timestamp);
1855 papi->send (papi->cls,
1857 (const char *) &connect_msg,
1858 sizeof (struct TransportSynMessage),
1860 SETUP_CONNECTION_TIMEOUT,
1861 &send_session_syn_cont, NULL))
1863 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1864 _("Failed to transmit SYN message to %s\n"),
1865 GST_plugins_a2s (na->address));
1866 n = lookup_neighbour (&na->address->peer);
1873 case GNUNET_TRANSPORT_PS_SYN_SENT:
1874 /* Remove address and request and additional one */
1875 GNUNET_assert (na == &n->primary_address);
1876 unset_primary_address (n);
1877 set_state_and_timeout (n,
1878 GNUNET_TRANSPORT_PS_INIT_ATS,
1879 GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT));
1880 /* Hard failure to send the SYN message with this address:
1881 Destroy address and session */
1883 case GNUNET_TRANSPORT_PS_RECONNECT_SENT:
1884 /* Remove address and request an additional one */
1885 GNUNET_assert (na == &n->primary_address);
1886 unset_primary_address (n);
1887 set_state_and_timeout (n,
1888 GNUNET_TRANSPORT_PS_RECONNECT_ATS,
1889 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
1891 case GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT:
1892 GNUNET_assert (na == &n->alternative_address);
1893 GNUNET_STATISTICS_update (GST_stats,
1894 gettext_noop ("# Failed attempts to switch addresses (failed to send SYN)"),
1897 /* Remove address and request an additional one */
1898 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1899 "Switch failed, cleaning up alternative address\n");
1900 free_address (&n->alternative_address);
1901 set_state_and_timeout (n,
1902 GNUNET_TRANSPORT_PS_CONNECTED,
1903 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
1907 disconnect_neighbour (n);
1912 GST_neighbours_notify_data_sent (na->address,
1914 sizeof (struct TransportSynMessage));
1919 * Continuation called from our attempt to transmitted our
1920 * #GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_SYN_ACK to the specified @a
1921 * target. Continue processing based on the @a result. Specifically,
1922 * if we failed to transmit, discard the address we used.
1925 * @param target which peer received the transmission
1926 * @param result #GNUNET_OK if sending worked
1927 * @param size_payload how many bytes of payload were sent (ignored)
1928 * @param size_on_wire how much bandwidth was consumed on the wire (ignored)
1931 send_session_syn_ack_cont (void *cls,
1932 const struct GNUNET_PeerIdentity *target,
1934 size_t size_payload,
1935 size_t size_on_wire)
1937 struct NeighbourMapEntry *n;
1939 n = lookup_neighbour (target);
1942 /* SYN_ACK continuation was called after neighbor was freed,
1943 * for example due to a time out for the state or the session
1944 * used was already terminated: nothing to do here... */
1948 if (GNUNET_TRANSPORT_PS_SYN_RECV_ACK != n->state)
1950 /* SYN_ACK continuation was called after neighbor changed state,
1951 * for example due to a time out for the state or the session
1952 * used was already terminated: nothing to do here... */
1955 if (GNUNET_OK == result)
1958 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1959 _("Failed to send SYN_ACK message to peer `%s' using address `%s'\n"),
1960 GNUNET_i2s (target),
1961 GST_plugins_a2s (n->primary_address.address));
1963 /* Remove address and request and additional one */
1964 /* FIXME: what if the neighbour's primary address
1965 changed in the meantime? Might want to instead
1966 pass "something" around in closure to be sure. */
1967 unset_primary_address (n);
1968 n->ack_state = ACK_SEND_SYN_ACK;
1969 set_state_and_timeout (n,
1970 GNUNET_TRANSPORT_PS_SYN_RECV_ATS,
1971 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
1976 * Send a SYN_ACK message via the given address.
1978 * @param na address and session to use
1979 * @param timestamp timestamp to use for the ACK message
1980 * @return #GNUNET_SYSERR if sending immediately failed, #GNUNET_OK otherwise
1983 send_syn_ack_message (struct NeighbourAddress *na,
1984 struct GNUNET_TIME_Absolute timestamp)
1986 const struct GNUNET_HELLO_Address *address = na->address;
1987 struct Session *session = na->session;
1988 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1989 struct TransportSynMessage connect_msg;
1990 struct NeighbourMapEntry *n;
1992 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1993 "Sending SYN_ACK to peer `%s'\n",
1994 GNUNET_i2s (&address->peer));
1996 if (NULL == (papi = GST_plugins_find (address->transport_name)))
2001 if (NULL == session)
2002 session = papi->get_session (papi->cls,
2004 if (NULL == session)
2009 GST_ats_new_session (address,
2011 GNUNET_STATISTICS_update (GST_stats,
2013 ("# SYN_ACK messages sent"),
2015 connect_msg.header.size = htons (sizeof (struct TransportSynMessage));
2016 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_SYN_ACK);
2017 connect_msg.reserved = htonl (0);
2018 connect_msg.timestamp = GNUNET_TIME_absolute_hton (timestamp);
2020 if (GNUNET_SYSERR ==
2021 papi->send (papi->cls,
2023 (const char *) &connect_msg,
2024 sizeof (struct TransportSynMessage),
2026 GNUNET_TIME_UNIT_FOREVER_REL,
2027 &send_session_syn_ack_cont, NULL))
2029 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2030 _("Failed to transmit SYN_ACK message to %s\n"),
2031 GST_plugins_a2s (address));
2033 n = lookup_neighbour (&address->peer);
2039 /* Remove address and request and additional one */
2040 unset_primary_address (n);
2041 n->ack_state = ACK_SEND_SYN_ACK;
2042 set_state_and_timeout (n,
2043 GNUNET_TRANSPORT_PS_SYN_RECV_ATS,
2044 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
2051 * Function called by the bandwidth tracker for a peer whenever
2052 * the tracker's state changed such that we need to recalculate
2053 * the delay for flow control. We calculate the latest delay
2054 * and inform the plugin (if applicable).
2056 * @param cls the `struct NeighbourMapEntry` to update calculations for
2059 inbound_bw_tracker_update (void *cls)
2061 struct NeighbourMapEntry *n = cls;
2062 struct GNUNET_TRANSPORT_PluginFunctions *papi;
2063 struct GNUNET_TIME_Relative delay;
2066 if (NULL == n->primary_address.address)
2067 return; /* not active, ignore */
2068 papi = GST_plugins_find (n->primary_address.address->transport_name);
2069 GNUNET_assert (NULL != papi);
2070 if (NULL == papi->update_inbound_delay)
2072 delay = GST_neighbours_calculate_receive_delay (&n->id,
2075 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2076 "New inbound delay for peer `%s' is %llu ms\n",
2077 GNUNET_i2s (&n->id),
2078 delay.rel_value_us / 1000);
2079 papi->update_inbound_delay (papi->cls,
2081 n->primary_address.session,
2087 * Create a fresh entry in the neighbour map for the given peer
2089 * @param peer peer to create an entry for
2090 * @return new neighbour map entry
2092 static struct NeighbourMapEntry *
2093 setup_neighbour (const struct GNUNET_PeerIdentity *peer)
2095 struct NeighbourMapEntry *n;
2097 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2098 "Creating new neighbour entry for `%s'\n",
2100 n = GNUNET_new (struct NeighbourMapEntry);
2102 n->ack_state = ACK_UNDEFINED;
2103 n->last_util_transmission = GNUNET_TIME_absolute_get();
2104 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
2105 &inbound_bw_tracker_update,
2107 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
2108 MAX_BANDWIDTH_CARRY_S);
2109 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
2110 set_state_and_timeout (n,
2111 GNUNET_TRANSPORT_PS_NOT_CONNECTED,
2112 GNUNET_TIME_UNIT_FOREVER_ABS);
2113 GNUNET_assert (GNUNET_OK ==
2114 GNUNET_CONTAINER_multipeermap_put (neighbours,
2116 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2117 n->suggest_handle = GNUNET_ATS_connectivity_suggest (GST_ats_connect,
2125 * Entry in a DLL we use to keep track of pending blacklist checks.
2127 struct BlacklistCheckSwitchContext
2132 struct BlacklistCheckSwitchContext *prev;
2137 struct BlacklistCheckSwitchContext *next;
2140 * Handle to the blacklist check we are performing.
2142 struct GST_BlacklistCheck *blc;
2145 * Address we are asking the blacklist subsystem about.
2147 struct GNUNET_HELLO_Address *address;
2150 * Session we should use in conjunction with @e address, can be NULL.
2152 struct Session *session;
2155 * Inbound bandwidth that was assigned to @e address.
2157 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in;
2160 * Outbound bandwidth that was assigned to @e address.
2162 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out;
2167 * Black list check result for try_connect call
2168 * If connection to the peer is allowed request adddress and
2170 * @param cls blc_ctx bl context
2171 * @param peer the peer
2172 * @param result the result
2175 try_connect_bl_check_cont (void *cls,
2176 const struct GNUNET_PeerIdentity *peer,
2179 struct BlacklistCheckSwitchContext *blc_ctx = cls;
2180 struct NeighbourMapEntry *n;
2182 GNUNET_CONTAINER_DLL_remove (pending_bc_head,
2185 GNUNET_free (blc_ctx);
2186 if (GNUNET_OK != result)
2188 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2189 _("Blacklisting disapproved to connect to peer `%s'\n"),
2194 /* Setup a new neighbour */
2195 if (NULL != lookup_neighbour(peer))
2196 return; /* The neighbor was created in the meantime while waited for BL clients */
2198 n = setup_neighbour (peer);
2200 /* Request address suggestions for this peer */
2201 set_state_and_timeout (n,
2202 GNUNET_TRANSPORT_PS_INIT_ATS,
2203 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
2208 * Try to create a connection to the given target (eventually).
2210 * @param target peer to try to connect to
2213 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
2215 struct NeighbourMapEntry *n;
2216 struct GST_BlacklistCheck *blc;
2217 struct BlacklistCheckSwitchContext *blc_ctx;
2219 if (NULL == neighbours)
2221 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2222 "Asked to connect to peer `%s' during shutdown\n",
2223 GNUNET_i2s (target));
2224 return; /* during shutdown, do nothing */
2226 n = lookup_neighbour (target);
2227 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2228 "Asked to connect to peer `%s' (state: %s)\n",
2229 GNUNET_i2s (target),
2230 (NULL != n) ? GNUNET_TRANSPORT_ps2s(n->state) : "NEW PEER");
2235 case GNUNET_TRANSPORT_PS_NOT_CONNECTED:
2236 /* this should not be possible */
2240 case GNUNET_TRANSPORT_PS_INIT_ATS:
2241 case GNUNET_TRANSPORT_PS_SYN_SENT:
2242 case GNUNET_TRANSPORT_PS_SYN_RECV_ATS:
2243 case GNUNET_TRANSPORT_PS_SYN_RECV_ACK:
2244 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2245 "Ignoring request to try to connect to `%s', already trying!\n",
2246 GNUNET_i2s (target));
2247 return; /* already trying */
2248 case GNUNET_TRANSPORT_PS_CONNECTED:
2249 case GNUNET_TRANSPORT_PS_RECONNECT_ATS:
2250 case GNUNET_TRANSPORT_PS_RECONNECT_SENT:
2251 case GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT:
2252 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2253 "Ignoring request to try to connect, already connected to `%s'!\n",
2254 GNUNET_i2s (target));
2255 return; /* already connected */
2256 case GNUNET_TRANSPORT_PS_DISCONNECT:
2257 /* get rid of remains, ready to re-try immediately */
2260 case GNUNET_TRANSPORT_PS_DISCONNECT_FINISHED:
2261 /* should not be possible */
2265 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2266 "Unhandled state `%s'\n",
2267 GNUNET_TRANSPORT_ps2s (n->state));
2274 /* Do blacklist check if connecting to this peer is allowed */
2275 blc_ctx = GNUNET_new (struct BlacklistCheckSwitchContext);
2276 GNUNET_CONTAINER_DLL_insert (pending_bc_head,
2281 (blc = GST_blacklist_test_allowed (target,
2283 &try_connect_bl_check_cont,
2292 * We received a 'SYN' message from the other peer.
2293 * Consider switching to it.
2295 * @param message possibly a 'struct TransportSynMessage' (check format)
2296 * @param peer identity of the peer to switch the address for
2297 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
2300 GST_neighbours_handle_session_syn (const struct GNUNET_MessageHeader *message,
2301 const struct GNUNET_PeerIdentity *peer)
2303 const struct TransportSynMessage *scm;
2304 struct NeighbourMapEntry *n;
2305 struct GNUNET_TIME_Absolute ts;
2307 if (ntohs (message->size) != sizeof (struct TransportSynMessage))
2309 GNUNET_break_op (0);
2310 return GNUNET_SYSERR;
2312 GNUNET_STATISTICS_update (GST_stats,
2314 ("# SYN messages received"),
2316 if (NULL == neighbours)
2318 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2319 _("SYN request from peer `%s' ignored due impending shutdown\n"),
2321 return GNUNET_OK; /* we're shutting down */
2323 scm = (const struct TransportSynMessage *) message;
2324 GNUNET_break_op (0 == ntohl (scm->reserved));
2325 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2326 n = lookup_neighbour (peer);
2329 /* This is a new neighbour and set to not connected */
2330 n = setup_neighbour (peer);
2333 /* Remember this SYN message in neighbour */
2334 n->ack_state = ACK_SEND_SYN_ACK;
2335 n->connect_ack_timestamp = ts;
2337 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2338 "Received SYN for peer `%s' in state %s/%s\n",
2340 GNUNET_TRANSPORT_ps2s (n->state),
2341 print_ack_state (n->ack_state));
2345 case GNUNET_TRANSPORT_PS_NOT_CONNECTED:
2346 /* Request an address from ATS to send SYN_ACK to this peer */
2347 set_state_and_timeout (n,
2348 GNUNET_TRANSPORT_PS_SYN_RECV_ATS,
2349 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
2351 case GNUNET_TRANSPORT_PS_INIT_ATS:
2352 /* SYN message takes priority over us asking ATS for address:
2353 * Wait for ATS to suggest an address and send SYN_ACK */
2354 set_state_and_timeout (n,
2355 GNUNET_TRANSPORT_PS_SYN_RECV_ATS,
2356 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
2358 case GNUNET_TRANSPORT_PS_SYN_RECV_ATS:
2359 /* We already wait for an address to send an SYN_ACK */
2361 case GNUNET_TRANSPORT_PS_SYN_SENT:
2362 case GNUNET_TRANSPORT_PS_SYN_RECV_ACK:
2363 /* Send ACK immediately */
2364 n->ack_state = ACK_SEND_ACK;
2365 send_syn_ack_message (&n->primary_address,
2368 case GNUNET_TRANSPORT_PS_CONNECTED:
2369 /* we are already connected and can thus send the ACK immediately */
2370 GNUNET_assert (NULL != n->primary_address.address);
2371 GNUNET_assert (NULL != n->primary_address.session);
2372 n->ack_state = ACK_SEND_ACK;
2373 send_syn_ack_message (&n->primary_address,
2376 case GNUNET_TRANSPORT_PS_RECONNECT_ATS:
2377 /* We wait for ATS address suggestion */
2379 case GNUNET_TRANSPORT_PS_RECONNECT_SENT:
2380 /* We received a SYN message while waiting for a SYN_ACK in fast
2381 * reconnect. Send SYN_ACK immediately */
2382 n->ack_state = ACK_SEND_ACK;
2383 send_syn_ack_message (&n->primary_address,
2384 n->connect_ack_timestamp);
2386 case GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT:
2387 /* We are already connected and can thus send the ACK immediately;
2388 still, it can never hurt to have an alternative address, so also
2389 tell ATS about it */
2390 GNUNET_assert (NULL != n->primary_address.address);
2391 GNUNET_assert (NULL != n->primary_address.session);
2392 n->ack_state = ACK_SEND_ACK;
2393 send_syn_ack_message (&n->primary_address,
2396 case GNUNET_TRANSPORT_PS_DISCONNECT:
2397 /* Get rid of remains and re-try */
2399 n = setup_neighbour (peer);
2400 /* Remember the SYN time stamp for ACK message */
2401 n->ack_state = ACK_SEND_SYN_ACK;
2402 n->connect_ack_timestamp = ts;
2403 /* Request an address for the peer */
2404 set_state_and_timeout (n,
2405 GNUNET_TRANSPORT_PS_SYN_RECV_ATS,
2406 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
2408 case GNUNET_TRANSPORT_PS_DISCONNECT_FINISHED:
2409 /* should not be possible */
2413 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2414 "Unhandled state `%s'\n",
2415 GNUNET_TRANSPORT_ps2s (n->state));
2417 return GNUNET_SYSERR;
2424 * Check if the given @a address is the same that we are already
2425 * using for the respective neighbour. If so, update the bandwidth
2426 * assignment and possibly the session and return #GNUNET_OK.
2427 * If the new address is different from what the neighbour is
2428 * using right now, return #GNUNET_NO.
2430 * @param address address of the other peer,
2431 * @param session session to use or NULL if transport should initiate a session
2432 * @param bandwidth_in inbound quota to be used when connection is up,
2433 * 0 to disconnect from peer
2434 * @param bandwidth_out outbound quota to be used when connection is up,
2435 * 0 to disconnect from peer
2436 * @return #GNUNET_OK if we were able to just update the bandwidth and session,
2437 * #GNUNET_NO if more extensive changes are required (address changed)
2440 try_run_fast_ats_update (const struct GNUNET_HELLO_Address *address,
2441 struct Session *session,
2442 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
2443 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
2445 struct NeighbourMapEntry *n;
2447 n = lookup_neighbour (&address->peer);
2449 (NULL == n->primary_address.address) ||
2450 (0 != GNUNET_HELLO_address_cmp (address,
2451 n->primary_address.address)) )
2453 /* We are not really switching addresses, but merely adjusting
2454 session and/or bandwidth, can do fast ATS update! */
2455 if (session != n->primary_address.session)
2457 /* switch to a different session, but keeping same address; could
2458 happen if there is a 2nd inbound connection */
2459 n->primary_address.session = session;
2461 n->primary_address.bandwidth_in = bandwidth_in;
2462 n->primary_address.bandwidth_out = bandwidth_out;
2463 GST_neighbours_set_incoming_quota (&address->peer,
2465 send_outbound_quota (&address->peer,
2472 * We've been asked to switch addresses, and just now got the result
2473 * from the blacklist check to see if this is allowed.
2475 * @param cls the `struct BlacklistCheckSwitchContext` with
2476 * the information about the future address
2477 * @param peer the peer we may switch addresses on
2478 * @param result #GNUNET_NO if we are not allowed to use the new
2482 switch_address_bl_check_cont (void *cls,
2483 const struct GNUNET_PeerIdentity *peer,
2486 struct BlacklistCheckSwitchContext *blc_ctx = cls;
2487 struct GNUNET_TRANSPORT_PluginFunctions *papi;
2488 struct NeighbourMapEntry *n;
2490 if (result == GNUNET_NO)
2492 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2493 "Blacklist denied to switch to suggested address `%s' session %p for peer `%s'\n",
2494 GST_plugins_a2s (blc_ctx->address),
2496 GNUNET_i2s (&blc_ctx->address->peer));
2497 GNUNET_STATISTICS_update (GST_stats,
2498 "# ATS suggestions ignored (blacklist denied)",
2501 /* FIXME: tell plugin to force killing session here and now
2502 (note: _proper_ plugin API for this does not yet exist) */
2503 GST_ats_block_address (blc_ctx->address,
2508 papi = GST_plugins_find (blc_ctx->address->transport_name);
2509 GNUNET_assert (NULL != papi);
2511 if (NULL == blc_ctx->session)
2513 /* need to create a session, ATS only gave us an address */
2514 blc_ctx->session = papi->get_session (papi->cls,
2516 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2517 "Obtained new session for peer `%s' and address '%s': %p\n",
2518 GNUNET_i2s (&blc_ctx->address->peer),
2519 GST_plugins_a2s (blc_ctx->address),
2521 if (NULL != blc_ctx->session)
2522 GST_ats_new_session (blc_ctx->address,
2525 if (NULL == blc_ctx->session)
2527 /* session creation failed, bad!, fail! */
2528 GNUNET_STATISTICS_update (GST_stats,
2529 "# ATS suggestions ignored (failed to create session)",
2532 /* No session could be obtained, remove blacklist check and clean up */
2533 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2534 "Failed to obtain new session for peer `%s' and address '%s'\n",
2535 GNUNET_i2s (&blc_ctx->address->peer),
2536 GST_plugins_a2s (blc_ctx->address));
2537 GST_ats_block_address (blc_ctx->address,
2542 /* We did this check already before going into blacklist, but
2543 it is theoretically possible that the situation changed in
2544 the meantime, hence we check again here */
2546 try_run_fast_ats_update (blc_ctx->address,
2548 blc_ctx->bandwidth_in,
2549 blc_ctx->bandwidth_out))
2550 goto cleanup; /* was just a minor update, we're done */
2552 /* check if we also need to setup the neighbour entry */
2553 if (NULL == (n = lookup_neighbour (peer)))
2555 n = setup_neighbour (peer);
2556 n->state = GNUNET_TRANSPORT_PS_INIT_ATS;
2559 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2560 "Peer `%s' switches to address `%s'\n",
2561 GNUNET_i2s (&blc_ctx->address->peer),
2562 GST_plugins_a2s (blc_ctx->address));
2566 case GNUNET_TRANSPORT_PS_NOT_CONNECTED:
2568 GST_ats_block_address (blc_ctx->address,
2572 case GNUNET_TRANSPORT_PS_INIT_ATS:
2573 /* We requested an address and ATS suggests one:
2574 * set primary address and send SYN message*/
2575 set_primary_address (n,
2578 blc_ctx->bandwidth_in,
2579 blc_ctx->bandwidth_out);
2580 if (ACK_SEND_SYN_ACK == n->ack_state)
2582 /* Send pending SYN_ACK message */
2583 n->ack_state = ACK_SEND_ACK;
2584 send_syn_ack_message (&n->primary_address,
2585 n->connect_ack_timestamp);
2587 set_state_and_timeout (n,
2588 GNUNET_TRANSPORT_PS_SYN_SENT,
2589 GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT));
2590 send_syn (&n->primary_address);
2592 case GNUNET_TRANSPORT_PS_SYN_SENT:
2593 /* ATS suggested a new address while waiting for an SYN_ACK:
2594 * Switch and send new SYN */
2595 /* ATS suggests a different address, switch again */
2596 set_primary_address (n,
2599 blc_ctx->bandwidth_in,
2600 blc_ctx->bandwidth_out);
2601 if (ACK_SEND_SYN_ACK == n->ack_state)
2603 /* Send pending SYN_ACK message */
2604 n->ack_state = ACK_SEND_ACK;
2605 send_syn_ack_message (&n->primary_address,
2606 n->connect_ack_timestamp);
2608 set_state_and_timeout (n,
2609 GNUNET_TRANSPORT_PS_SYN_SENT,
2610 GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT));
2611 send_syn (&n->primary_address);
2613 case GNUNET_TRANSPORT_PS_SYN_RECV_ATS:
2614 /* We requested an address and ATS suggests one:
2615 * set primary address and send SYN_ACK message*/
2616 set_primary_address (n,
2619 blc_ctx->bandwidth_in,
2620 blc_ctx->bandwidth_out);
2621 /* Send an ACK message as a response to the SYN msg */
2622 set_state_and_timeout (n,
2623 GNUNET_TRANSPORT_PS_SYN_RECV_ACK,
2624 GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT));
2625 send_syn_ack_message (&n->primary_address,
2626 n->connect_ack_timestamp);
2627 if ( (ACK_SEND_SYN_ACK == n->ack_state) ||
2628 (ACK_UNDEFINED == n->ack_state) )
2629 n->ack_state = ACK_SEND_ACK;
2631 case GNUNET_TRANSPORT_PS_SYN_RECV_ACK:
2632 /* ATS asks us to switch while we were trying to connect; switch to new
2633 address and check blacklist again */
2634 if ( (ACK_SEND_SYN_ACK == n->ack_state) )
2636 n->ack_state = ACK_SEND_ACK;
2637 send_syn_ack_message (&n->primary_address,
2638 n->connect_ack_timestamp);
2640 set_primary_address (n,
2643 blc_ctx->bandwidth_in,
2644 blc_ctx->bandwidth_out);
2645 set_state_and_timeout (n,
2646 GNUNET_TRANSPORT_PS_SYN_RECV_ACK,
2647 GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT));
2649 case GNUNET_TRANSPORT_PS_CONNECTED:
2650 GNUNET_assert (NULL != n->primary_address.address);
2651 GNUNET_assert (NULL != n->primary_address.session);
2652 GNUNET_break (n->primary_address.session != blc_ctx->session);
2653 /* ATS asks us to switch a life connection; see if we can get
2654 a SYN_ACK on it before we actually do this! */
2655 set_alternative_address (n,
2658 blc_ctx->bandwidth_in,
2659 blc_ctx->bandwidth_out);
2660 set_state_and_timeout (n,
2661 GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT,
2662 GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT));
2663 GNUNET_STATISTICS_update (GST_stats,
2664 gettext_noop ("# Attempts to switch addresses"),
2667 send_syn (&n->alternative_address);
2669 case GNUNET_TRANSPORT_PS_RECONNECT_ATS:
2670 set_primary_address (n,
2673 blc_ctx->bandwidth_in,
2674 blc_ctx->bandwidth_out);
2675 if (ACK_SEND_SYN_ACK == n->ack_state)
2677 /* Send pending SYN_ACK message */
2678 n->ack_state = ACK_SEND_ACK;
2679 send_syn_ack_message (&n->primary_address,
2680 n->connect_ack_timestamp);
2682 set_state_and_timeout (n,
2683 GNUNET_TRANSPORT_PS_RECONNECT_SENT,
2684 GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT));
2685 send_syn (&n->primary_address);
2687 case GNUNET_TRANSPORT_PS_RECONNECT_SENT:
2688 /* ATS asks us to switch while we were trying to reconnect; switch to new
2689 address and send SYN again */
2690 set_primary_address (n,
2693 blc_ctx->bandwidth_in,
2694 blc_ctx->bandwidth_out);
2695 set_state_and_timeout (n,
2696 GNUNET_TRANSPORT_PS_RECONNECT_SENT,
2697 GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT));
2698 send_syn (&n->primary_address);
2700 case GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT:
2701 if ( (0 == GNUNET_HELLO_address_cmp (n->primary_address.address,
2702 blc_ctx->address)) &&
2703 (n->primary_address.session == blc_ctx->session) )
2705 /* ATS switches back to still-active session */
2706 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2707 "ATS double-switched, cleaning up alternative address\n");
2708 free_address (&n->alternative_address);
2709 set_state_and_timeout (n,
2710 GNUNET_TRANSPORT_PS_CONNECTED,
2714 /* ATS asks us to switch a life connection, send */
2715 set_alternative_address (n,
2718 blc_ctx->bandwidth_in,
2719 blc_ctx->bandwidth_out);
2720 set_state_and_timeout (n,
2721 GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT,
2722 GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT));
2723 send_syn (&n->alternative_address);
2725 case GNUNET_TRANSPORT_PS_DISCONNECT:
2726 /* not going to switch addresses while disconnecting */
2727 GNUNET_STATISTICS_update (GST_stats,
2728 "# ATS suggestion ignored (disconnecting)",
2732 case GNUNET_TRANSPORT_PS_DISCONNECT_FINISHED:
2736 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2737 "Unhandled state `%s'\n",
2738 GNUNET_TRANSPORT_ps2s (n->state));
2743 GNUNET_CONTAINER_DLL_remove (pending_bc_head,
2746 GNUNET_HELLO_address_free (blc_ctx->address);
2747 GNUNET_free (blc_ctx);
2752 * For the given peer, switch to this address.
2754 * Before accepting this addresses and actively using it, a blacklist check
2757 * If any check fails or the suggestion can somehow not be followed, we
2758 * MUST call #GST_ats_block_address() to tell ATS that the suggestion
2759 * could not be satisfied and force ATS to do something else.
2761 * @param address address of the other peer,
2762 * @param session session to use or NULL if transport should initiate a session
2763 * @param bandwidth_in inbound quota to be used when connection is up,
2764 * 0 to disconnect from peer
2765 * @param bandwidth_out outbound quota to be used when connection is up,
2766 * 0 to disconnect from peer
2769 GST_neighbours_switch_to_address (const struct GNUNET_HELLO_Address *address,
2770 struct Session *session,
2771 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
2772 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
2774 struct GST_BlacklistCheck *blc;
2775 struct BlacklistCheckSwitchContext *blc_ctx;
2777 GNUNET_assert (NULL != address->transport_name);
2779 try_run_fast_ats_update (address,
2785 /* Check if plugin is available */
2786 if (NULL == (GST_plugins_find (address->transport_name)))
2788 /* we don't have the plugin for this address */
2790 GST_ats_block_address (address,
2794 if ((NULL == session) &&
2795 (GNUNET_HELLO_address_check_option (address,
2796 GNUNET_HELLO_ADDRESS_INFO_INBOUND)))
2798 /* This is a inbound address and we do not have a session to use! */
2800 GST_ats_block_address (address,
2805 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2806 "ATS suggests address '%s' for peer `%s' at %u/%u speed\n",
2807 GST_plugins_a2s (address),
2808 GNUNET_i2s (&address->peer),
2809 (unsigned int) ntohl (bandwidth_in.value__),
2810 (unsigned int) ntohl (bandwidth_out.value__));
2812 /* Perform blacklist check */
2813 blc_ctx = GNUNET_new (struct BlacklistCheckSwitchContext);
2814 blc_ctx->address = GNUNET_HELLO_address_copy (address);
2815 blc_ctx->session = session;
2816 blc_ctx->bandwidth_in = bandwidth_in;
2817 blc_ctx->bandwidth_out = bandwidth_out;
2818 GNUNET_CONTAINER_DLL_insert (pending_bc_head,
2821 if (NULL != (blc = GST_blacklist_test_allowed (&address->peer,
2822 address->transport_name,
2823 &switch_address_bl_check_cont,
2832 * Function called to send network utilization data to ATS for
2833 * each active connection.
2836 * @param key peer we send utilization data for
2837 * @param value the `struct NeighbourMapEntry *` with data to send
2838 * @return #GNUNET_OK (continue to iterate)
2841 send_utilization_data (void *cls,
2842 const struct GNUNET_PeerIdentity *key,
2845 struct NeighbourMapEntry *n = value;
2848 struct GNUNET_TIME_Relative delta;
2850 if ( (GNUNET_YES != test_connected (n)) ||
2851 (NULL == n->primary_address.address) )
2853 delta = GNUNET_TIME_absolute_get_difference (n->last_util_transmission,
2854 GNUNET_TIME_absolute_get ());
2856 if ((0 != n->util_total_bytes_recv) && (0 != delta.rel_value_us))
2857 bps_in = (1000LL * 1000LL * n->util_total_bytes_recv) / (delta.rel_value_us);
2859 if ((0 != n->util_total_bytes_sent) && (0 != delta.rel_value_us))
2860 bps_out = (1000LL * 1000LL * n->util_total_bytes_sent) / delta.rel_value_us;
2862 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2863 "`%s' total: received %u Bytes/s, sent %u Bytes/s\n",
2867 GST_ats_update_utilization (n->primary_address.address,
2870 n->util_total_bytes_recv = 0;
2871 n->util_total_bytes_sent = 0;
2872 n->last_util_transmission = GNUNET_TIME_absolute_get ();
2878 * Task transmitting utilization in a regular interval
2880 * @param cls the 'struct NeighbourMapEntry' for which we are running
2881 * @param tc scheduler context (unused)
2884 utilization_transmission (void *cls,
2885 const struct GNUNET_SCHEDULER_TaskContext *tc)
2887 util_transmission_tk = NULL;
2888 GNUNET_CONTAINER_multipeermap_iterate (neighbours,
2889 &send_utilization_data,
2891 util_transmission_tk
2892 = GNUNET_SCHEDULER_add_delayed (UTIL_TRANSMISSION_INTERVAL,
2893 &utilization_transmission,
2899 * Track information about data we received from the
2900 * given address (used to notify ATS about our utilization
2901 * of allocated resources).
2903 * @param address the address we got data from
2904 * @param message the message we received (really only the size is used)
2907 GST_neighbours_notify_data_recv (const struct GNUNET_HELLO_Address *address,
2908 const struct GNUNET_MessageHeader *message)
2910 struct NeighbourMapEntry *n;
2912 n = lookup_neighbour (&address->peer);
2915 n->util_total_bytes_recv += ntohs (message->size);
2920 * Track information about data we transmitted using the given @a
2921 * address and @a session (used to notify ATS about our utilization of
2922 * allocated resources).
2924 * @param address the address we transmitted data to
2925 * @param session session we used to transmit data
2926 * @param message the message we sent (really only the size is used)
2929 GST_neighbours_notify_data_sent (const struct GNUNET_HELLO_Address *address,
2930 struct Session *session,
2933 struct NeighbourMapEntry *n;
2935 n = lookup_neighbour (&address->peer);
2938 if (n->primary_address.session != session)
2940 n->util_total_bytes_sent += size;
2945 * Master task run for every neighbour. Performs all of the time-related
2946 * activities (keep alive, send next message, disconnect if idle, finish
2947 * clean up after disconnect).
2949 * @param cls the 'struct NeighbourMapEntry' for which we are running
2950 * @param tc scheduler context (unused)
2953 master_task (void *cls,
2954 const struct GNUNET_SCHEDULER_TaskContext *tc)
2956 struct NeighbourMapEntry *n = cls;
2957 struct GNUNET_TIME_Relative delay;
2960 delay = GNUNET_TIME_absolute_get_remaining (n->timeout);
2961 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2962 "Master task runs for neighbour `%s' in state %s with timeout in %s\n",
2963 GNUNET_i2s (&n->id),
2964 GNUNET_TRANSPORT_ps2s(n->state),
2965 GNUNET_STRINGS_relative_time_to_string (delay,
2969 case GNUNET_TRANSPORT_PS_NOT_CONNECTED:
2970 /* invalid state for master task, clean up */
2974 case GNUNET_TRANSPORT_PS_INIT_ATS:
2975 if (0 == delay.rel_value_us)
2977 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2978 "Connection to `%s' timed out waiting for ATS to provide address\n",
2979 GNUNET_i2s (&n->id));
2984 case GNUNET_TRANSPORT_PS_SYN_SENT:
2985 if (0 == delay.rel_value_us)
2987 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2988 "Connection to `%s' timed out waiting for other peer to send SYN_ACK\n",
2989 GNUNET_i2s (&n->id));
2990 /* Remove address and request and additional one */
2991 unset_primary_address (n);
2992 set_state_and_timeout (n,
2993 GNUNET_TRANSPORT_PS_INIT_ATS,
2994 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
2998 case GNUNET_TRANSPORT_PS_SYN_RECV_ATS:
2999 if (0 == delay.rel_value_us)
3001 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3002 "Connection to `%s' timed out waiting ATS to provide address to use for SYN_ACK\n",
3003 GNUNET_i2s (&n->id));
3008 case GNUNET_TRANSPORT_PS_SYN_RECV_ACK:
3009 if (0 == delay.rel_value_us)
3011 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3012 "Connection to `%s' timed out waiting for other peer to send ACK\n",
3013 GNUNET_i2s (&n->id));
3014 disconnect_neighbour (n);
3018 case GNUNET_TRANSPORT_PS_CONNECTED:
3019 if (0 == delay.rel_value_us)
3021 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3022 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
3023 GNUNET_i2s (&n->id));
3024 disconnect_neighbour (n);
3027 try_transmission_to_peer (n);
3030 case GNUNET_TRANSPORT_PS_RECONNECT_ATS:
3031 if (0 == delay.rel_value_us)
3033 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3034 "Connection to `%s' timed out, waiting for ATS replacement address\n",
3035 GNUNET_i2s (&n->id));
3036 disconnect_neighbour (n);
3040 case GNUNET_TRANSPORT_PS_RECONNECT_SENT:
3041 if (0 == delay.rel_value_us)
3043 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3044 "Connection to `%s' timed out, waiting for other peer to SYN_ACK replacement address\n",
3045 GNUNET_i2s (&n->id));
3046 disconnect_neighbour (n);
3050 case GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT:
3051 if (0 == delay.rel_value_us)
3053 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3054 "Switch failed, cleaning up alternative address\n");
3055 free_address (&n->alternative_address);
3056 set_state_and_timeout (n,
3057 GNUNET_TRANSPORT_PS_CONNECTED,
3058 GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT));
3060 try_transmission_to_peer (n);
3063 case GNUNET_TRANSPORT_PS_DISCONNECT:
3064 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3065 "Cleaning up connection to `%s' after sending DISCONNECT\n",
3066 GNUNET_i2s (&n->id));
3069 case GNUNET_TRANSPORT_PS_DISCONNECT_FINISHED:
3070 /* how did we get here!? */
3074 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3075 "Unhandled state `%s'\n",
3076 GNUNET_TRANSPORT_ps2s (n->state));
3080 delay = GNUNET_TIME_absolute_get_remaining (n->timeout);
3081 if ( (GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT == n->state) ||
3082 (GNUNET_TRANSPORT_PS_CONNECTED == n->state) )
3084 /* if we are *now* in one of the two states, we're sending
3085 keep alive messages, so we need to consider the keepalive
3086 delay, not just the connection timeout */
3087 delay = GNUNET_TIME_relative_min (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time),
3090 if (NULL == n->task)
3091 n->task = GNUNET_SCHEDULER_add_delayed (delay,
3098 * Send a ACK message to the neighbour to confirm that we
3101 * @param n neighbour to send the ACK to
3104 send_session_ack_message (struct NeighbourMapEntry *n)
3106 struct GNUNET_MessageHeader msg;
3108 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3109 "Sending ACK message to peer `%s'\n",
3110 GNUNET_i2s (&n->id));
3112 msg.size = htons (sizeof (struct GNUNET_MessageHeader));
3113 msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK);
3114 (void) send_with_session (n,
3116 sizeof (struct GNUNET_MessageHeader),
3118 GNUNET_TIME_UNIT_FOREVER_REL,
3125 * We received a 'SESSION_SYN_ACK' message from the other peer.
3126 * Consider switching to it.
3128 * @param message possibly a `struct SessionConnectMessage` (check format)
3129 * @param peer identity of the peer to switch the address for
3130 * @param address address of the other peer, NULL if other peer
3132 * @param session session to use (or NULL)
3133 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
3136 GST_neighbours_handle_session_syn_ack (const struct GNUNET_MessageHeader *message,
3137 const struct GNUNET_HELLO_Address *address,
3138 struct Session *session)
3140 const struct TransportSynMessage *scm;
3141 struct GNUNET_TIME_Absolute ts;
3142 struct NeighbourMapEntry *n;
3144 if (ntohs (message->size) != sizeof (struct TransportSynMessage))
3146 GNUNET_break_op (0);
3147 return GNUNET_SYSERR;
3149 GNUNET_STATISTICS_update (GST_stats,
3151 ("# SYN_ACK messages received"),
3153 scm = (const struct TransportSynMessage *) message;
3154 GNUNET_break_op (ntohl (scm->reserved) == 0);
3155 if (NULL == (n = lookup_neighbour (&address->peer)))
3157 GNUNET_STATISTICS_update (GST_stats,
3159 ("# unexpected SYN_ACK messages (no peer)"),
3161 return GNUNET_SYSERR;
3163 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3164 "Received SYN_ACK message from peer `%s' in state %s/%s\n",
3165 GNUNET_i2s (&address->peer),
3166 GNUNET_TRANSPORT_ps2s (n->state),
3167 print_ack_state (n->ack_state));
3168 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
3171 case GNUNET_TRANSPORT_PS_NOT_CONNECTED:
3174 return GNUNET_SYSERR;
3175 case GNUNET_TRANSPORT_PS_INIT_ATS:
3176 GNUNET_STATISTICS_update (GST_stats,
3177 gettext_noop ("# unexpected SYN_ACK messages (not ready)"),
3181 case GNUNET_TRANSPORT_PS_SYN_SENT:
3182 if (ts.abs_value_us != n->primary_address.connect_timestamp.abs_value_us)
3184 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3185 "SYN_ACK ignored as the timestamp does not match our SYN request\n");
3188 set_state_and_timeout (n,
3189 GNUNET_TRANSPORT_PS_CONNECTED,
3190 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
3191 set_primary_address (n,
3192 n->primary_address.address,
3193 n->primary_address.session,
3194 n->primary_address.bandwidth_in,
3195 n->primary_address.bandwidth_out);
3196 send_session_ack_message (n);
3198 case GNUNET_TRANSPORT_PS_SYN_RECV_ATS:
3199 case GNUNET_TRANSPORT_PS_SYN_RECV_ACK:
3200 GNUNET_STATISTICS_update (GST_stats,
3201 gettext_noop ("# unexpected SYN_ACK messages (not ready)"),
3205 case GNUNET_TRANSPORT_PS_CONNECTED:
3206 /* duplicate SYN_ACK, let's answer by duplicate ACK just in case */
3207 send_session_ack_message (n);
3209 case GNUNET_TRANSPORT_PS_RECONNECT_ATS:
3210 /* we didn't expect any SYN_ACK, as we are waiting for ATS
3211 to give us a new address... */
3212 GNUNET_STATISTICS_update (GST_stats,
3213 gettext_noop ("# unexpected SYN_ACK messages (waiting on ATS)"),
3217 case GNUNET_TRANSPORT_PS_RECONNECT_SENT:
3218 /* Reconnecting with new address address worked; go back to connected! */
3219 set_state_and_timeout (n,
3220 GNUNET_TRANSPORT_PS_CONNECTED,
3221 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
3222 send_session_ack_message (n);
3224 case GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT:
3225 /* new address worked; adopt it and go back to connected! */
3226 set_state_and_timeout (n,
3227 GNUNET_TRANSPORT_PS_CONNECTED,
3228 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
3229 GNUNET_break (GNUNET_NO == n->alternative_address.ats_active);
3231 /* Set primary addresses */
3232 set_primary_address (n,
3233 n->alternative_address.address,
3234 n->alternative_address.session,
3235 n->alternative_address.bandwidth_in,
3236 n->alternative_address.bandwidth_out);
3237 GNUNET_STATISTICS_update (GST_stats,
3238 gettext_noop ("# Successful attempts to switch addresses"),
3242 GNUNET_HELLO_address_free (n->alternative_address.address);
3243 memset (&n->alternative_address,
3245 sizeof (n->alternative_address));
3246 send_session_ack_message (n);
3248 case GNUNET_TRANSPORT_PS_DISCONNECT:
3249 GNUNET_STATISTICS_update (GST_stats,
3251 ("# unexpected SYN_ACK messages (disconnecting)"),
3253 return GNUNET_SYSERR;
3254 case GNUNET_TRANSPORT_PS_DISCONNECT_FINISHED:
3258 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3259 "Unhandled state `%s'\n",
3260 GNUNET_TRANSPORT_ps2s (n->state));
3262 return GNUNET_SYSERR;
3269 * A session was terminated. Take note; if needed, try to get
3270 * an alternative address from ATS.
3272 * @param peer identity of the peer where the session died
3273 * @param session session that is gone
3274 * @return #GNUNET_YES if this was a session used, #GNUNET_NO if
3275 * this session was not in use
3278 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
3279 struct Session *session)
3281 struct NeighbourMapEntry *n;
3282 struct BlackListCheckContext *bcc;
3283 struct BlackListCheckContext *bcc_next;
3285 /* make sure to cancel all ongoing blacklist checks involving 'session' */
3287 while (NULL != (bcc = bcc_next))
3289 bcc_next = bcc->next;
3290 if (bcc->na.session == session)
3292 if (NULL != bcc->bc)
3293 GST_blacklist_test_cancel (bcc->bc);
3294 GNUNET_HELLO_address_free (bcc->na.address);
3295 GNUNET_CONTAINER_DLL_remove (bc_head,
3301 if (NULL == (n = lookup_neighbour (peer)))
3302 return GNUNET_NO; /* can't affect us */
3303 if (session != n->primary_address.session)
3305 /* Free alternative address */
3306 if (session == n->alternative_address.session)
3308 if (GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT == n->state)
3309 set_state_and_timeout (n,
3310 GNUNET_TRANSPORT_PS_CONNECTED,
3312 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3313 "Session died, cleaning up alternative address\n");
3314 free_address (&n->alternative_address);
3316 return GNUNET_NO; /* doesn't affect us further */
3319 n->expect_latency_response = GNUNET_NO;
3320 /* The session for neighbour's primary address died */
3323 case GNUNET_TRANSPORT_PS_NOT_CONNECTED:
3327 case GNUNET_TRANSPORT_PS_INIT_ATS:
3331 case GNUNET_TRANSPORT_PS_SYN_SENT:
3332 /* The session used to send the SYN terminated:
3333 * this implies a connect error*/
3334 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3335 "Failed to send SYN in %s with `%s' %p: session terminated\n",
3337 GST_plugins_a2s (n->primary_address.address),
3338 n->primary_address.session,
3341 /* Destroy the address since it cannot be used */
3342 unset_primary_address (n);
3343 set_state_and_timeout (n,
3344 GNUNET_TRANSPORT_PS_INIT_ATS,
3345 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
3347 case GNUNET_TRANSPORT_PS_SYN_RECV_ATS:
3348 case GNUNET_TRANSPORT_PS_SYN_RECV_ACK:
3349 /* error on inbound session; free neighbour entirely */
3352 case GNUNET_TRANSPORT_PS_CONNECTED:
3353 /* Our primary connection died, try a fast reconnect */
3354 unset_primary_address (n);
3355 set_state_and_timeout (n,
3356 GNUNET_TRANSPORT_PS_RECONNECT_ATS,
3357 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
3359 case GNUNET_TRANSPORT_PS_RECONNECT_ATS:
3360 /* we don't have an address, how can it go down? */
3363 case GNUNET_TRANSPORT_PS_RECONNECT_SENT:
3364 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3365 "Failed to send SYN in %s with `%s' %p: session terminated\n",
3367 GST_plugins_a2s (n->primary_address.address),
3368 n->primary_address.session,
3370 /* Destroy the address since it cannot be used */
3371 unset_primary_address (n);
3372 set_state_and_timeout (n,
3373 GNUNET_TRANSPORT_PS_RECONNECT_ATS,
3374 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
3376 case GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT:
3377 /* primary went down while we were waiting for SYN_ACK on secondary;
3378 secondary as primary */
3380 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3381 "Connection `%s' %p to peer `%s' was terminated while switching, "
3382 "switching to alternative address `%s' %p\n",
3383 GST_plugins_a2s (n->primary_address.address),
3384 n->primary_address.session,
3386 GST_plugins_a2s (n->alternative_address.address),
3387 n->alternative_address.session);
3389 /* Destroy the inbound address since it cannot be used */
3390 free_address (&n->primary_address);
3391 n->primary_address = n->alternative_address;
3392 memset (&n->alternative_address,
3394 sizeof (struct NeighbourAddress));
3395 set_state_and_timeout (n,
3396 GNUNET_TRANSPORT_PS_RECONNECT_SENT,
3397 GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT));
3399 case GNUNET_TRANSPORT_PS_DISCONNECT:
3400 unset_primary_address (n);
3402 case GNUNET_TRANSPORT_PS_DISCONNECT_FINISHED:
3403 /* neighbour was freed and plugins told to terminate session */
3406 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3407 "Unhandled state `%s'\n",
3408 GNUNET_TRANSPORT_ps2s (n->state));
3412 if (NULL != n->task)
3413 GNUNET_SCHEDULER_cancel (n->task);
3414 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
3420 * We received a 'ACK' message from the other peer.
3421 * If we sent a 'SYN_ACK' last, this means we are now
3422 * connected. Otherwise, do nothing.
3424 * @param message possibly a 'struct SessionConnectMessage' (check format)
3425 * @param address address of the other peer
3426 * @param session session to use (or NULL)
3427 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
3430 GST_neighbours_handle_session_ack (const struct GNUNET_MessageHeader *message,
3431 const struct GNUNET_HELLO_Address *address,
3432 struct Session *session)
3434 struct NeighbourMapEntry *n;
3436 if (ntohs (message->size) != sizeof (struct GNUNET_MessageHeader))
3438 GNUNET_break_op (0);
3439 return GNUNET_SYSERR;
3441 GNUNET_STATISTICS_update (GST_stats,
3442 gettext_noop ("# ACK messages received"),
3445 if (NULL == (n = lookup_neighbour (&address->peer)))
3447 GNUNET_break_op (0);
3448 return GNUNET_SYSERR;
3450 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3451 "Received ACK for peer `%s' in state %s/%s\n",
3452 GNUNET_i2s (&address->peer),
3453 GNUNET_TRANSPORT_ps2s (n->state),
3454 print_ack_state (n->ack_state));
3456 /* Check if we are in a plausible state for having sent
3457 a SYN_ACK. If not, return, otherwise break.
3459 The remote peers sends a ACK as a response for a SYN_ACK
3463 - If a remote peer has sent a SYN, we responded with a SYN_ACK and
3464 now wait for the ACK to finally be connected
3465 - If we sent a SYN_ACK to this peer before */
3467 if ( (GNUNET_TRANSPORT_PS_SYN_RECV_ACK != n->state) &&
3468 (ACK_SEND_ACK != n->ack_state))
3470 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3471 "Received unexpected ACK message from peer `%s' in state %s/%s\n",
3472 GNUNET_i2s (&address->peer),
3473 GNUNET_TRANSPORT_ps2s (n->state),
3474 print_ack_state (n->ack_state));
3476 GNUNET_STATISTICS_update (GST_stats,
3477 gettext_noop ("# unexpected ACK messages"), 1,
3481 if (GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT == n->state)
3483 /* We tried to switch addresses while being connect. We explicitly wait
3484 * for a SYN_ACK before going to GNUNET_TRANSPORT_PS_CONNECTED,
3485 * so we do not want to set the address as in use! */
3488 set_state_and_timeout (n,
3489 GNUNET_TRANSPORT_PS_CONNECTED,
3490 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
3492 /* Reset backoff for primary address */
3493 GST_ats_block_reset (n->primary_address.address,
3494 n->primary_address.session);
3500 * Test if we're connected to the given peer.
3502 * @param target peer to test
3503 * @return #GNUNET_YES if we are connected, #GNUNET_NO if not
3506 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
3508 return test_connected (lookup_neighbour (target));
3513 * Change the incoming quota for the given peer.
3515 * @param neighbour identity of peer to change qutoa for
3516 * @param quota new quota
3519 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
3520 struct GNUNET_BANDWIDTH_Value32NBO quota)
3522 struct NeighbourMapEntry *n;
3524 if (NULL == (n = lookup_neighbour (neighbour)))
3526 GNUNET_STATISTICS_update (GST_stats,
3528 ("# SET QUOTA messages ignored (no such peer)"),
3532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3533 "Setting inbound quota of %u Bps for peer `%s' to all clients\n",
3534 ntohl (quota.value__), GNUNET_i2s (&n->id));
3535 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
3536 if (0 != ntohl (quota.value__))
3538 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3539 "Disconnecting peer `%4s' due to SET_QUOTA\n",
3540 GNUNET_i2s (&n->id));
3541 if (GNUNET_YES == test_connected (n))
3542 GNUNET_STATISTICS_update (GST_stats,
3543 gettext_noop ("# disconnects due to quota of 0"),
3545 disconnect_neighbour (n);
3550 * Task to asynchronously run #free_neighbour().
3552 * @param cls the `struct NeighbourMapEntry` to free
3556 delayed_disconnect (void *cls,
3557 const struct GNUNET_SCHEDULER_TaskContext* tc)
3559 struct NeighbourMapEntry *n = cls;
3561 n->delayed_disconnect_task = NULL;
3562 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3563 "Disconnecting by request from peer %s\n",
3564 GNUNET_i2s (&n->id));
3570 * We received a disconnect message from the given peer,
3571 * validate and process.
3573 * @param peer sender of the message
3574 * @param msg the disconnect message
3577 GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity *peer,
3578 const struct GNUNET_MessageHeader *msg)
3580 struct NeighbourMapEntry *n;
3581 const struct SessionDisconnectMessage *sdm;
3583 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3584 "Received DISCONNECT message from peer `%s'\n",
3586 if (ntohs (msg->size) != sizeof (struct SessionDisconnectMessage))
3588 GNUNET_break_op (0);
3589 GNUNET_STATISTICS_update (GST_stats,
3591 ("# disconnect messages ignored (malformed)"), 1,
3595 GNUNET_STATISTICS_update (GST_stats,
3597 ("# DISCONNECT messages received"),
3599 sdm = (const struct SessionDisconnectMessage *) msg;
3600 if (NULL == (n = lookup_neighbour (peer)))
3605 if (GNUNET_TIME_absolute_ntoh (sdm->timestamp).abs_value_us <= n->connect_ack_timestamp.abs_value_us)
3607 GNUNET_STATISTICS_update (GST_stats,
3608 gettext_noop ("# disconnect messages ignored (timestamp)"),
3613 if (0 != memcmp (peer,
3615 sizeof (struct GNUNET_PeerIdentity)))
3617 GNUNET_break_op (0);
3620 if (ntohl (sdm->purpose.size) !=
3621 sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
3622 sizeof (struct GNUNET_CRYPTO_EddsaPublicKey) +
3623 sizeof (struct GNUNET_TIME_AbsoluteNBO))
3625 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3626 "DISCONNECT message from peer `%s' has invalid size\n",
3628 GNUNET_break_op (0);
3632 GNUNET_CRYPTO_eddsa_verify (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT,
3637 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3638 "DISCONNECT message from peer `%s' cannot be verified \n",
3640 GNUNET_break_op (0);
3643 n->delayed_disconnect_task = GNUNET_SCHEDULER_add_now (&delayed_disconnect, n);
3648 * Closure for the #neighbours_iterate() function.
3650 struct IteratorContext
3653 * Function to call on each connected neighbour.
3655 GST_NeighbourIterator cb;
3658 * Closure for @e cb.
3665 * Call the callback from the closure for each neighbour.
3667 * @param cls the `struct IteratorContext`
3668 * @param key the hash of the public key of the neighbour
3669 * @param value the `struct NeighbourMapEntry`
3670 * @return #GNUNET_OK (continue to iterate)
3673 neighbours_iterate (void *cls,
3674 const struct GNUNET_PeerIdentity *key,
3677 struct IteratorContext *ic = cls;
3678 struct NeighbourMapEntry *n = value;
3679 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in;
3680 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out;
3682 if (NULL != n->primary_address.address)
3684 bandwidth_in = n->primary_address.bandwidth_in;
3685 bandwidth_out = n->primary_address.bandwidth_out;
3689 bandwidth_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
3690 bandwidth_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
3694 n->primary_address.address,
3697 bandwidth_in, bandwidth_out);
3703 * Iterate over all connected neighbours.
3705 * @param cb function to call
3706 * @param cb_cls closure for cb
3709 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
3711 struct IteratorContext ic;
3713 if (NULL == neighbours)
3714 return; /* can happen during shutdown */
3717 GNUNET_CONTAINER_multipeermap_iterate (neighbours,
3718 &neighbours_iterate,
3724 * If we have an active connection to the given target, it must be shutdown.
3726 * @param target peer to disconnect from
3729 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
3731 struct NeighbourMapEntry *n;
3733 if (NULL == (n = lookup_neighbour (target)))
3734 return; /* not active */
3735 if (GNUNET_YES == test_connected (n))
3736 GNUNET_STATISTICS_update (GST_stats,
3737 gettext_noop ("# disconnected from peer upon explicit request"),
3740 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3741 "Forced disconnect from peer %s\n",
3742 GNUNET_i2s (target));
3743 disconnect_neighbour (n);
3748 * Obtain current address information for the given neighbour.
3751 * @return address currently used
3753 struct GNUNET_HELLO_Address *
3754 GST_neighbour_get_current_address (const struct GNUNET_PeerIdentity *peer)
3756 struct NeighbourMapEntry *n;
3758 n = lookup_neighbour (peer);
3761 return n->primary_address.address;
3766 * Initialize the neighbours subsystem.
3768 * @param max_fds maximum number of fds to use
3771 GST_neighbours_start (unsigned int max_fds)
3773 neighbours = GNUNET_CONTAINER_multipeermap_create (NEIGHBOUR_TABLE_SIZE,
3775 util_transmission_tk = GNUNET_SCHEDULER_add_delayed (UTIL_TRANSMISSION_INTERVAL,
3776 &utilization_transmission,
3782 * Disconnect from the given neighbour.
3785 * @param key hash of neighbour's public key (not used)
3786 * @param value the 'struct NeighbourMapEntry' of the neighbour
3787 * @return #GNUNET_OK (continue to iterate)
3790 disconnect_all_neighbours (void *cls,
3791 const struct GNUNET_PeerIdentity *key,
3794 struct NeighbourMapEntry *n = value;
3796 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3797 "Disconnecting peer `%4s' during shutdown\n",
3798 GNUNET_i2s (&n->id));
3805 * Cleanup the neighbours subsystem.
3808 GST_neighbours_stop ()
3810 struct BlacklistCheckSwitchContext *cur;
3811 struct BlacklistCheckSwitchContext *next;
3813 if (NULL == neighbours)
3815 if (NULL != util_transmission_tk)
3817 GNUNET_SCHEDULER_cancel (util_transmission_tk);
3818 util_transmission_tk = NULL;
3820 GNUNET_CONTAINER_multipeermap_iterate (neighbours,
3821 &disconnect_all_neighbours,
3823 GNUNET_CONTAINER_multipeermap_destroy (neighbours);
3825 next = pending_bc_head;
3826 for (cur = next; NULL != cur; cur = next)
3829 GNUNET_CONTAINER_DLL_remove (pending_bc_head,
3833 if (NULL != cur->blc)
3835 GST_blacklist_test_cancel (cur->blc);
3838 if (NULL != cur->address)
3839 GNUNET_HELLO_address_free (cur->address);
3845 /* end of file gnunet-service-transport_neighbours.c */