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 (n->primary_address.session != NULL);
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,
1227 int success, size_t size_payload, size_t physical)
1229 struct MessageQueue *mq = cls;
1230 struct NeighbourMapEntry *n;
1232 if (NULL == (n = lookup_neighbour (receiver)))
1235 return; /* disconnect or other error while transmitting, can happen */
1237 if (n->is_active == mq)
1239 /* this is still "our" neighbour, remove us from its queue
1240 and allow it to send the next message now */
1241 n->is_active = NULL;
1242 if (NULL != n->task)
1243 GNUNET_SCHEDULER_cancel (n->task);
1244 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1246 if (bytes_in_send_queue < mq->message_buf_size)
1248 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1249 "Bytes_in_send_queue `%u', Message_size %u, result: %s, payload %u, on wire %u\n",
1250 bytes_in_send_queue,
1251 mq->message_buf_size,
1252 (GNUNET_OK == success) ? "OK" : "FAIL",
1259 GNUNET_break (size_payload == mq->message_buf_size);
1260 bytes_in_send_queue -= mq->message_buf_size;
1261 GNUNET_STATISTICS_set (GST_stats,
1263 ("# bytes in message queue for other peers"),
1264 bytes_in_send_queue, GNUNET_NO);
1265 if (GNUNET_OK == success)
1266 GNUNET_STATISTICS_update (GST_stats,
1268 ("# messages transmitted to other peers"),
1271 GNUNET_STATISTICS_update (GST_stats,
1273 ("# transmission failures for messages to other peers"),
1275 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1276 "Sending message to `%s' of type %u with %u bytes was a %s\n",
1277 GNUNET_i2s (receiver),
1278 ntohs (((struct GNUNET_MessageHeader *) mq->message_buf)->type),
1279 mq->message_buf_size,
1280 (success == GNUNET_OK) ? "success" : "FAILURE");
1281 if (NULL != mq->cont)
1282 mq->cont (mq->cont_cls, success, size_payload, physical);
1288 * Check the message list for the given neighbour and if we can
1289 * send a message, do so. This function should only be called
1290 * if the connection is at least generally ready for transmission.
1291 * While we will only send one message at a time, no bandwidth
1292 * quota management is performed here. If a message was given to
1293 * the plugin, the continuation will automatically re-schedule
1294 * the 'master' task once the next message might be transmitted.
1296 * @param n target peer for which to transmit
1299 try_transmission_to_peer (struct NeighbourMapEntry *n)
1301 struct MessageQueue *mq;
1302 struct GNUNET_TIME_Relative timeout;
1304 if (NULL == n->primary_address.address)
1306 /* no address, why are we here? */
1310 if ((0 == n->primary_address.address->address_length) &&
1311 (NULL == n->primary_address.session))
1313 /* no address, why are we here? */
1317 if (NULL != n->is_active)
1319 /* transmission already pending */
1323 /* timeout messages from the queue that are past their due date */
1324 while (NULL != (mq = n->messages_head))
1326 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1327 if (timeout.rel_value_us > 0)
1329 GNUNET_STATISTICS_update (GST_stats,
1331 ("# messages timed out while in transport queue"),
1333 GNUNET_CONTAINER_DLL_remove (n->messages_head,
1337 transmit_send_continuation (mq,
1340 mq->message_buf_size,
1344 return; /* no more messages */
1345 GNUNET_CONTAINER_DLL_remove (n->messages_head,
1350 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1351 "Giving message with %u bytes to plugin session %p\n",
1352 mq->message_buf_size,
1353 n->primary_address.session);
1354 (void) send_with_session (n,
1356 mq->message_buf_size,
1360 &transmit_send_continuation,
1366 * Send keepalive message to the neighbour. Must only be called
1367 * if we are on 'connected' state or while trying to switch addresses.
1368 * Will internally determine if a keepalive is truly needed (so can
1369 * always be called).
1371 * @param n neighbour that went idle and needs a keepalive
1374 send_keepalive (struct NeighbourMapEntry *n)
1376 struct SessionKeepAliveMessage m;
1377 struct GNUNET_TIME_Relative timeout;
1380 GNUNET_assert ((GNUNET_TRANSPORT_PS_CONNECTED == n->state) ||
1381 (GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT == n->state));
1382 if (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time).rel_value_us > 0)
1383 return; /* no keepalive needed at this time */
1385 nonce = 0; /* 0 indicates 'not set' */
1387 nonce = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1389 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1390 "Sending keep alive to peer `%s' with nonce %u\n",
1391 GNUNET_i2s (&n->id),
1393 m.header.size = htons (sizeof (struct SessionKeepAliveMessage));
1394 m.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE);
1395 m.nonce = htonl (nonce);
1397 timeout = send_with_session (n,
1400 UINT32_MAX /* priority */,
1401 GNUNET_TIME_UNIT_FOREVER_REL,
1404 GNUNET_STATISTICS_update (GST_stats,
1405 gettext_noop ("# keepalives sent"),
1408 n->primary_address.keep_alive_nonce = nonce;
1409 n->expect_latency_response = GNUNET_YES;
1410 n->last_keep_alive_time = GNUNET_TIME_absolute_get ();
1411 n->keep_alive_time = GNUNET_TIME_relative_to_absolute (timeout);
1416 * Keep the connection to the given neighbour alive longer,
1417 * we received a KEEPALIVE (or equivalent); send a response.
1419 * @param neighbour neighbour to keep alive (by sending keep alive response)
1420 * @param m the keep alive message containing the nonce to respond to
1423 GST_neighbours_keepalive (const struct GNUNET_PeerIdentity *neighbour,
1424 const struct GNUNET_MessageHeader *m)
1426 struct NeighbourMapEntry *n;
1427 const struct SessionKeepAliveMessage *msg_in;
1428 struct SessionKeepAliveMessage msg;
1430 if (sizeof (struct SessionKeepAliveMessage) != ntohs (m->size))
1433 msg_in = (struct SessionKeepAliveMessage *) m;
1434 if (NULL == (n = lookup_neighbour (neighbour)))
1436 GNUNET_STATISTICS_update (GST_stats,
1438 ("# KEEPALIVE messages discarded (peer unknown)"),
1442 if (NULL == n->primary_address.session)
1444 GNUNET_STATISTICS_update (GST_stats,
1446 ("# KEEPALIVE messages discarded (no session)"),
1451 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1452 "Received keep alive request from peer `%s' with nonce %u\n",
1453 GNUNET_i2s (&n->id), ntohl (msg_in->nonce));
1455 /* send reply to allow neighbour to measure latency */
1456 msg.header.size = htons (sizeof (struct SessionKeepAliveMessage));
1457 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE);
1458 msg.nonce = msg_in->nonce;
1459 (void) send_with_session (n,
1461 sizeof (struct SessionKeepAliveMessage),
1462 UINT32_MAX /* priority */,
1463 GNUNET_TIME_UNIT_FOREVER_REL,
1470 * We received a KEEP_ALIVE_RESPONSE message and use this to calculate
1471 * latency to this peer. Pass the updated information (existing ats
1472 * plus calculated latency) to ATS.
1474 * @param neighbour neighbour to keep alive
1475 * @param m the message containing the keep alive response
1478 GST_neighbours_keepalive_response (const struct GNUNET_PeerIdentity *neighbour,
1479 const struct GNUNET_MessageHeader *m)
1481 struct NeighbourMapEntry *n;
1482 const struct SessionKeepAliveMessage *msg;
1483 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1484 struct GNUNET_ATS_Information ats;
1485 struct GNUNET_TIME_Relative latency;
1487 if (sizeof (struct SessionKeepAliveMessage) != ntohs (m->size))
1490 msg = (const struct SessionKeepAliveMessage *) m;
1491 if (NULL == (n = lookup_neighbour (neighbour)))
1493 GNUNET_STATISTICS_update (GST_stats,
1495 ("# KEEPALIVE_RESPONSE messages discarded (not connected)"),
1499 if ( (GNUNET_TRANSPORT_PS_CONNECTED != n->state) ||
1500 (GNUNET_YES != n->expect_latency_response) )
1502 GNUNET_STATISTICS_update (GST_stats,
1504 ("# KEEPALIVE_RESPONSE messages discarded (not expected)"),
1508 if (NULL == n->primary_address.address)
1510 GNUNET_STATISTICS_update (GST_stats,
1512 ("# KEEPALIVE_RESPONSE messages discarded (address changed)"),
1516 if (n->primary_address.keep_alive_nonce != ntohl (msg->nonce))
1518 GNUNET_STATISTICS_update (GST_stats,
1520 ("# KEEPALIVE_RESPONSE messages discarded (wrong nonce)"),
1526 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1527 "Received keep alive response from peer `%s' for session %p\n",
1528 GNUNET_i2s (&n->id), n->primary_address.session);
1532 /* Update session timeout here */
1533 if (NULL != (papi = GST_plugins_find (n->primary_address.address->transport_name)))
1535 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1536 "Updating session for peer `%s' for session %p\n",
1537 GNUNET_i2s (&n->id), n->primary_address.session);
1538 papi->update_session_timeout (papi->cls, &n->id, n->primary_address.session);
1545 n->primary_address.keep_alive_nonce = 0;
1546 n->expect_latency_response = GNUNET_NO;
1547 set_state_and_timeout (n,
1549 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
1551 latency = GNUNET_TIME_absolute_get_duration (n->last_keep_alive_time);
1552 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1553 "Latency for peer `%s' is %s\n",
1554 GNUNET_i2s (&n->id),
1555 GNUNET_STRINGS_relative_time_to_string (latency,
1557 /* append latency */
1558 ats.type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
1559 ats.value = htonl ( (latency.rel_value_us > UINT32_MAX)
1561 : (uint32_t) latency.rel_value_us );
1562 GST_ats_update_metrics (n->primary_address.address,
1563 n->primary_address.session,
1569 * We have received a message from the given sender. How long should
1570 * we delay before receiving more? (Also used to keep the peer marked
1573 * @param sender sender of the message
1574 * @param size size of the message
1575 * @param do_forward set to #GNUNET_YES if the message should be forwarded to clients
1576 * #GNUNET_NO if the neighbour is not connected or violates the quota,
1577 * #GNUNET_SYSERR if the connection is not fully up yet
1578 * @return how long to wait before reading more from this sender
1580 struct GNUNET_TIME_Relative
1581 GST_neighbours_calculate_receive_delay (const struct GNUNET_PeerIdentity
1582 *sender, ssize_t size, int *do_forward)
1584 struct NeighbourMapEntry *n;
1585 struct GNUNET_TIME_Relative ret;
1587 if (NULL == neighbours)
1589 *do_forward = GNUNET_NO;
1590 return GNUNET_TIME_UNIT_FOREVER_REL; /* This can happen during shutdown */
1592 if (NULL == (n = lookup_neighbour (sender)))
1594 GST_neighbours_try_connect (sender);
1595 if (NULL == (n = lookup_neighbour (sender)))
1597 GNUNET_STATISTICS_update (GST_stats,
1599 ("# messages discarded due to lack of neighbour record"),
1601 *do_forward = GNUNET_NO;
1602 return GNUNET_TIME_UNIT_ZERO;
1605 if (! test_connected (n))
1607 *do_forward = GNUNET_SYSERR;
1608 return GNUNET_TIME_UNIT_ZERO;
1610 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, size))
1612 n->quota_violation_count++;
1613 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1614 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
1615 n->in_tracker.available_bytes_per_s__,
1616 n->quota_violation_count);
1617 /* Discount 32k per violation */
1618 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, -32 * 1024);
1622 if (n->quota_violation_count > 0)
1624 /* try to add 32k back */
1625 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker, 32 * 1024);
1626 n->quota_violation_count--;
1629 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
1631 GNUNET_STATISTICS_update (GST_stats,
1633 ("# bandwidth quota violations by other peers"),
1635 *do_forward = GNUNET_NO;
1636 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
1638 *do_forward = GNUNET_YES;
1639 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 32 * 1024);
1640 if (ret.rel_value_us > 0)
1642 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1643 "Throttling read (%lld bytes excess at %u b/s), waiting %s before reading more.\n",
1644 (long long) n->in_tracker.consumption_since_last_update__,
1645 (unsigned int) n->in_tracker.available_bytes_per_s__,
1646 GNUNET_STRINGS_relative_time_to_string (ret, GNUNET_YES));
1647 GNUNET_STATISTICS_update (GST_stats,
1648 gettext_noop ("# ms throttling suggested"),
1649 (int64_t) ret.rel_value_us / 1000LL,
1657 * Transmit a message to the given target using the active connection.
1659 * @param target destination
1660 * @param msg message to send
1661 * @param msg_size number of bytes in msg
1662 * @param timeout when to fail with timeout
1663 * @param cont function to call when done
1664 * @param cont_cls closure for @a cont
1667 GST_neighbours_send (const struct GNUNET_PeerIdentity *target,
1670 struct GNUNET_TIME_Relative timeout,
1671 GST_NeighbourSendContinuation cont,
1674 struct NeighbourMapEntry *n;
1675 struct MessageQueue *mq;
1677 /* All ove these cases should never happen; they are all API violations.
1678 But we check anyway, just to be sure. */
1679 if (NULL == (n = lookup_neighbour (target)))
1683 cont (cont_cls, GNUNET_SYSERR, msg_size, 0);
1686 if (GNUNET_YES != test_connected (n))
1690 cont (cont_cls, GNUNET_SYSERR, msg_size, 0);
1693 bytes_in_send_queue += msg_size;
1694 GNUNET_STATISTICS_set (GST_stats,
1696 ("# bytes in message queue for other peers"),
1697 bytes_in_send_queue, GNUNET_NO);
1698 mq = GNUNET_malloc (sizeof (struct MessageQueue) + msg_size);
1700 mq->cont_cls = cont_cls;
1701 memcpy (&mq[1], msg, msg_size);
1702 mq->message_buf = (const char *) &mq[1];
1703 mq->message_buf_size = msg_size;
1704 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1706 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Enqueueing %u bytes to send to peer %s\n",
1707 msg_size, GNUNET_i2s (target));
1709 GNUNET_CONTAINER_DLL_insert_tail (n->messages_head, n->messages_tail, mq);
1710 if (NULL != n->task)
1711 GNUNET_SCHEDULER_cancel (n->task);
1712 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
1717 * Continuation called from our attempt to transmitted our
1718 * #GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_SYN to the specified @a
1719 * target. Continue processing based on the @a result. Specifically,
1720 * if we failed to transmit, discard the address we used.
1723 * @param target which peer received the transmission
1724 * @param result #GNUNET_OK if sending worked
1725 * @param size_payload how many bytes of payload were sent (ignored)
1726 * @param size_on_wire how much bandwidth was consumed on the wire (ignored)
1729 send_session_syn_cont (void *cls,
1730 const struct GNUNET_PeerIdentity *target,
1732 size_t size_payload,
1733 size_t size_on_wire)
1735 struct NeighbourMapEntry *n;
1737 n = lookup_neighbour (target);
1740 /* SYN continuation was called after neighbor was freed,
1741 * for example due to a time out for the state or the session
1742 * used was already terminated: nothing to do here... */
1746 if ( (GNUNET_TRANSPORT_PS_SYN_SENT != n->state) &&
1747 (GNUNET_TRANSPORT_PS_RECONNECT_SENT != n->state) &&
1748 (GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT != n->state))
1750 /* SYN continuation was called after neighbor changed state,
1751 * for example due to a time out for the state or the session
1752 * used was already terminated: nothing to do here... */
1755 if (GNUNET_OK == result)
1758 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1759 _("Failed to send SYN message to peer `%s'\n"),
1760 GNUNET_i2s (target));
1762 case GNUNET_TRANSPORT_PS_SYN_SENT:
1763 /* Remove address and request an additional one */
1764 unset_primary_address (n);
1765 set_state_and_timeout (n,
1766 GNUNET_TRANSPORT_PS_INIT_ATS,
1767 GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT));
1769 case GNUNET_TRANSPORT_PS_RECONNECT_SENT:
1770 /* Remove address and request an additional one */
1771 unset_primary_address (n);
1772 set_state_and_timeout (n,
1773 GNUNET_TRANSPORT_PS_RECONNECT_ATS,
1774 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
1776 case GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT:
1777 /* Remove address and request and go back to primary address */
1778 GNUNET_STATISTICS_update (GST_stats,
1779 gettext_noop ("# Failed attempts to switch addresses (failed to send SYN CONT)"),
1782 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1783 "Switch failed, cleaning up alternative address\n");
1784 free_address (&n->alternative_address);
1785 set_state_and_timeout (n,
1786 GNUNET_TRANSPORT_PS_CONNECTED,
1787 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
1790 disconnect_neighbour (n);
1797 * Send a SYN message via the given address.
1799 * @param na address to use
1802 send_syn (struct NeighbourAddress *na)
1804 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1805 struct TransportSynMessage connect_msg;
1806 struct NeighbourMapEntry *n;
1808 GNUNET_assert (NULL != na->session);
1809 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1810 "Sending SYN message to peer `%s' at %s\n",
1811 GNUNET_i2s (&na->address->peer),
1812 GST_plugins_a2s (na->address));
1814 papi = GST_plugins_find (na->address->transport_name);
1815 GNUNET_assert (NULL != papi);
1816 GNUNET_STATISTICS_update (GST_stats,
1818 ("# SYN messages sent"),
1820 na->connect_timestamp = GNUNET_TIME_absolute_get ();
1821 connect_msg.header.size = htons (sizeof (struct TransportSynMessage));
1822 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_SYN);
1823 connect_msg.reserved = htonl (0);
1824 connect_msg.timestamp = GNUNET_TIME_absolute_hton (na->connect_timestamp);
1826 papi->send (papi->cls,
1828 (const char *) &connect_msg,
1829 sizeof (struct TransportSynMessage),
1831 SETUP_CONNECTION_TIMEOUT,
1832 &send_session_syn_cont, NULL))
1834 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1835 _("Failed to transmit SYN message to %s\n"),
1836 GST_plugins_a2s (na->address));
1837 n = lookup_neighbour (&na->address->peer);
1844 case GNUNET_TRANSPORT_PS_SYN_SENT:
1845 /* Remove address and request and additional one */
1846 GNUNET_assert (na == &n->primary_address);
1847 unset_primary_address (n);
1848 set_state_and_timeout (n,
1849 GNUNET_TRANSPORT_PS_INIT_ATS,
1850 GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT));
1851 /* Hard failure to send the SYN message with this address:
1852 Destroy address and session */
1854 case GNUNET_TRANSPORT_PS_RECONNECT_SENT:
1855 /* Remove address and request an additional one */
1856 GNUNET_assert (na == &n->primary_address);
1857 unset_primary_address (n);
1858 set_state_and_timeout (n,
1859 GNUNET_TRANSPORT_PS_RECONNECT_ATS,
1860 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
1862 case GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT:
1863 GNUNET_assert (na == &n->alternative_address);
1864 GNUNET_STATISTICS_update (GST_stats,
1865 gettext_noop ("# Failed attempts to switch addresses (failed to send SYN)"),
1868 /* Remove address and request an additional one */
1869 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1870 "Switch failed, cleaning up alternative address\n");
1871 free_address (&n->alternative_address);
1872 set_state_and_timeout (n,
1873 GNUNET_TRANSPORT_PS_CONNECTED,
1874 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
1878 disconnect_neighbour (n);
1883 GST_neighbours_notify_data_sent (na->address,
1885 sizeof (struct TransportSynMessage));
1890 * Continuation called from our attempt to transmitted our
1891 * #GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_SYN_ACK to the specified @a
1892 * target. Continue processing based on the @a result. Specifically,
1893 * if we failed to transmit, discard the address we used.
1896 * @param target which peer received the transmission
1897 * @param result #GNUNET_OK if sending worked
1898 * @param size_payload how many bytes of payload were sent (ignored)
1899 * @param size_on_wire how much bandwidth was consumed on the wire (ignored)
1902 send_session_syn_ack_cont (void *cls,
1903 const struct GNUNET_PeerIdentity *target,
1905 size_t size_payload,
1906 size_t size_on_wire)
1908 struct NeighbourMapEntry *n;
1910 n = lookup_neighbour (target);
1913 /* SYN_ACK continuation was called after neighbor was freed,
1914 * for example due to a time out for the state or the session
1915 * used was already terminated: nothing to do here... */
1919 if (GNUNET_TRANSPORT_PS_SYN_RECV_ACK != n->state)
1921 /* SYN_ACK continuation was called after neighbor changed state,
1922 * for example due to a time out for the state or the session
1923 * used was already terminated: nothing to do here... */
1926 if (GNUNET_OK == result)
1929 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1930 _("Failed to send SYN_ACK message to peer `%s' using address `%s'\n"),
1931 GNUNET_i2s (target),
1932 GST_plugins_a2s (n->primary_address.address));
1934 /* Remove address and request and additional one */
1935 /* FIXME: what if the neighbour's primary address
1936 changed in the meantime? Might want to instead
1937 pass "something" around in closure to be sure. */
1938 unset_primary_address (n);
1939 n->ack_state = ACK_SEND_SYN_ACK;
1940 set_state_and_timeout (n,
1941 GNUNET_TRANSPORT_PS_SYN_RECV_ATS,
1942 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
1947 * Send a SYN_ACK message via the given address.
1949 * @param na address and session to use
1950 * @param timestamp timestamp to use for the ACK message
1951 * @return #GNUNET_SYSERR if sending immediately failed, #GNUNET_OK otherwise
1954 send_syn_ack_message (struct NeighbourAddress *na,
1955 struct GNUNET_TIME_Absolute timestamp)
1957 const struct GNUNET_HELLO_Address *address = na->address;
1958 struct Session *session = na->session;
1959 struct GNUNET_TRANSPORT_PluginFunctions *papi;
1960 struct TransportSynMessage connect_msg;
1961 struct NeighbourMapEntry *n;
1963 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1964 "Sending SYN_ACK to peer `%s'\n",
1965 GNUNET_i2s (&address->peer));
1967 if (NULL == (papi = GST_plugins_find (address->transport_name)))
1972 if (NULL == session)
1973 session = papi->get_session (papi->cls,
1975 if (NULL == session)
1980 GST_ats_new_session (address,
1982 GNUNET_STATISTICS_update (GST_stats,
1984 ("# SYN_ACK messages sent"),
1986 connect_msg.header.size = htons (sizeof (struct TransportSynMessage));
1987 connect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_SYN_ACK);
1988 connect_msg.reserved = htonl (0);
1989 connect_msg.timestamp = GNUNET_TIME_absolute_hton (timestamp);
1991 if (GNUNET_SYSERR ==
1992 papi->send (papi->cls,
1994 (const char *) &connect_msg,
1995 sizeof (struct TransportSynMessage),
1997 GNUNET_TIME_UNIT_FOREVER_REL,
1998 &send_session_syn_ack_cont, NULL))
2000 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2001 _("Failed to transmit SYN_ACK message to %s\n"),
2002 GST_plugins_a2s (address));
2004 n = lookup_neighbour (&address->peer);
2010 /* Remove address and request and additional one */
2011 unset_primary_address (n);
2012 n->ack_state = ACK_SEND_SYN_ACK;
2013 set_state_and_timeout (n,
2014 GNUNET_TRANSPORT_PS_SYN_RECV_ATS,
2015 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
2022 * Function called by the bandwidth tracker for a peer whenever
2023 * the tracker's state changed such that we need to recalculate
2024 * the delay for flow control. We calculate the latest delay
2025 * and inform the plugin (if applicable).
2027 * @param cls the `struct NeighbourMapEntry` to update calculations for
2030 inbound_bw_tracker_update (void *cls)
2032 struct NeighbourMapEntry *n = cls;
2033 struct GNUNET_TRANSPORT_PluginFunctions *papi;
2034 struct GNUNET_TIME_Relative delay;
2037 if (NULL == n->primary_address.address)
2038 return; /* not active, ignore */
2039 papi = GST_plugins_find (n->primary_address.address->transport_name);
2040 GNUNET_assert (NULL != papi);
2041 if (NULL == papi->update_inbound_delay)
2043 delay = GST_neighbours_calculate_receive_delay (&n->id,
2046 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2047 "New inbound delay for peer `%s' is %llu ms\n",
2048 GNUNET_i2s (&n->id),
2049 delay.rel_value_us / 1000);
2050 papi->update_inbound_delay (papi->cls,
2052 n->primary_address.session,
2058 * Create a fresh entry in the neighbour map for the given peer
2060 * @param peer peer to create an entry for
2061 * @return new neighbour map entry
2063 static struct NeighbourMapEntry *
2064 setup_neighbour (const struct GNUNET_PeerIdentity *peer)
2066 struct NeighbourMapEntry *n;
2068 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2069 "Creating new neighbour entry for `%s'\n",
2071 n = GNUNET_new (struct NeighbourMapEntry);
2073 n->ack_state = ACK_UNDEFINED;
2074 n->last_util_transmission = GNUNET_TIME_absolute_get();
2075 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
2076 &inbound_bw_tracker_update,
2078 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
2079 MAX_BANDWIDTH_CARRY_S);
2080 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
2081 set_state_and_timeout (n,
2082 GNUNET_TRANSPORT_PS_NOT_CONNECTED,
2083 GNUNET_TIME_UNIT_FOREVER_ABS);
2084 GNUNET_assert (GNUNET_OK ==
2085 GNUNET_CONTAINER_multipeermap_put (neighbours,
2087 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2088 n->suggest_handle = GNUNET_ATS_connectivity_suggest (GST_ats_connect,
2096 * Entry in a DLL we use to keep track of pending blacklist checks.
2098 struct BlacklistCheckSwitchContext
2103 struct BlacklistCheckSwitchContext *prev;
2108 struct BlacklistCheckSwitchContext *next;
2111 * Handle to the blacklist check we are performing.
2113 struct GST_BlacklistCheck *blc;
2116 * Address we are asking the blacklist subsystem about.
2118 struct GNUNET_HELLO_Address *address;
2121 * Session we should use in conjunction with @e address, can be NULL.
2123 struct Session *session;
2126 * Inbound bandwidth that was assigned to @e address.
2128 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in;
2131 * Outbound bandwidth that was assigned to @e address.
2133 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out;
2138 * Black list check result for try_connect call
2139 * If connection to the peer is allowed request adddress and
2141 * @param cls blc_ctx bl context
2142 * @param peer the peer
2143 * @param result the result
2146 try_connect_bl_check_cont (void *cls,
2147 const struct GNUNET_PeerIdentity *peer,
2150 struct BlacklistCheckSwitchContext *blc_ctx = cls;
2151 struct NeighbourMapEntry *n;
2153 GNUNET_CONTAINER_DLL_remove (pending_bc_head,
2156 GNUNET_free (blc_ctx);
2157 if (GNUNET_OK != result)
2159 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2160 _("Blacklisting disapproved to connect to peer `%s'\n"),
2165 /* Setup a new neighbour */
2166 if (NULL != lookup_neighbour(peer))
2167 return; /* The neighbor was created in the meantime while waited for BL clients */
2169 n = setup_neighbour (peer);
2171 /* Request address suggestions for this peer */
2172 set_state_and_timeout (n,
2173 GNUNET_TRANSPORT_PS_INIT_ATS,
2174 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
2179 * Try to create a connection to the given target (eventually).
2181 * @param target peer to try to connect to
2184 GST_neighbours_try_connect (const struct GNUNET_PeerIdentity *target)
2186 struct NeighbourMapEntry *n;
2187 struct GST_BlacklistCheck *blc;
2188 struct BlacklistCheckSwitchContext *blc_ctx;
2190 if (NULL == neighbours)
2192 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2193 "Asked to connect to peer `%s' during shutdown\n",
2194 GNUNET_i2s (target));
2195 return; /* during shutdown, do nothing */
2197 n = lookup_neighbour (target);
2198 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2199 "Asked to connect to peer `%s' (state: %s)\n",
2200 GNUNET_i2s (target),
2201 (NULL != n) ? GNUNET_TRANSPORT_ps2s(n->state) : "NEW PEER");
2206 case GNUNET_TRANSPORT_PS_NOT_CONNECTED:
2207 /* this should not be possible */
2211 case GNUNET_TRANSPORT_PS_INIT_ATS:
2212 case GNUNET_TRANSPORT_PS_SYN_SENT:
2213 case GNUNET_TRANSPORT_PS_SYN_RECV_ATS:
2214 case GNUNET_TRANSPORT_PS_SYN_RECV_ACK:
2215 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2216 "Ignoring request to try to connect to `%s', already trying!\n",
2217 GNUNET_i2s (target));
2218 return; /* already trying */
2219 case GNUNET_TRANSPORT_PS_CONNECTED:
2220 case GNUNET_TRANSPORT_PS_RECONNECT_ATS:
2221 case GNUNET_TRANSPORT_PS_RECONNECT_SENT:
2222 case GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT:
2223 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2224 "Ignoring request to try to connect, already connected to `%s'!\n",
2225 GNUNET_i2s (target));
2226 return; /* already connected */
2227 case GNUNET_TRANSPORT_PS_DISCONNECT:
2228 /* get rid of remains, ready to re-try immediately */
2231 case GNUNET_TRANSPORT_PS_DISCONNECT_FINISHED:
2232 /* should not be possible */
2236 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2237 "Unhandled state `%s'\n",
2238 GNUNET_TRANSPORT_ps2s (n->state));
2245 /* Do blacklist check if connecting to this peer is allowed */
2246 blc_ctx = GNUNET_new (struct BlacklistCheckSwitchContext);
2247 GNUNET_CONTAINER_DLL_insert (pending_bc_head,
2252 (blc = GST_blacklist_test_allowed (target,
2254 &try_connect_bl_check_cont,
2263 * We received a 'SYN' message from the other peer.
2264 * Consider switching to it.
2266 * @param message possibly a 'struct TransportSynMessage' (check format)
2267 * @param peer identity of the peer to switch the address for
2268 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
2271 GST_neighbours_handle_session_syn (const struct GNUNET_MessageHeader *message,
2272 const struct GNUNET_PeerIdentity *peer)
2274 const struct TransportSynMessage *scm;
2275 struct NeighbourMapEntry *n;
2276 struct GNUNET_TIME_Absolute ts;
2278 if (ntohs (message->size) != sizeof (struct TransportSynMessage))
2280 GNUNET_break_op (0);
2281 return GNUNET_SYSERR;
2283 GNUNET_STATISTICS_update (GST_stats,
2285 ("# SYN messages received"),
2287 if (NULL == neighbours)
2289 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2290 _("SYN request from peer `%s' ignored due impending shutdown\n"),
2292 return GNUNET_OK; /* we're shutting down */
2294 scm = (const struct TransportSynMessage *) message;
2295 GNUNET_break_op (0 == ntohl (scm->reserved));
2296 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
2297 n = lookup_neighbour (peer);
2300 /* This is a new neighbour and set to not connected */
2301 n = setup_neighbour (peer);
2304 /* Remember this SYN message in neighbour */
2305 n->ack_state = ACK_SEND_SYN_ACK;
2306 n->connect_ack_timestamp = ts;
2308 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2309 "Received SYN for peer `%s' in state %s/%s\n",
2311 GNUNET_TRANSPORT_ps2s (n->state),
2312 print_ack_state (n->ack_state));
2316 case GNUNET_TRANSPORT_PS_NOT_CONNECTED:
2317 /* Request an address from ATS to send SYN_ACK to this peer */
2318 set_state_and_timeout (n,
2319 GNUNET_TRANSPORT_PS_SYN_RECV_ATS,
2320 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
2322 case GNUNET_TRANSPORT_PS_INIT_ATS:
2323 /* SYN message takes priority over us asking ATS for address:
2324 * Wait for ATS to suggest an address and send SYN_ACK */
2325 set_state_and_timeout (n,
2326 GNUNET_TRANSPORT_PS_SYN_RECV_ATS,
2327 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
2329 case GNUNET_TRANSPORT_PS_SYN_RECV_ATS:
2330 /* We already wait for an address to send an SYN_ACK */
2332 case GNUNET_TRANSPORT_PS_SYN_SENT:
2333 case GNUNET_TRANSPORT_PS_SYN_RECV_ACK:
2334 /* Send ACK immediately */
2335 n->ack_state = ACK_SEND_ACK;
2336 send_syn_ack_message (&n->primary_address,
2339 case GNUNET_TRANSPORT_PS_CONNECTED:
2340 /* we are already connected and can thus send the ACK immediately */
2341 GNUNET_assert (NULL != n->primary_address.address);
2342 GNUNET_assert (NULL != n->primary_address.session);
2343 n->ack_state = ACK_SEND_ACK;
2344 send_syn_ack_message (&n->primary_address,
2347 case GNUNET_TRANSPORT_PS_RECONNECT_ATS:
2348 /* We wait for ATS address suggestion */
2350 case GNUNET_TRANSPORT_PS_RECONNECT_SENT:
2351 /* We received a SYN message while waiting for a SYN_ACK in fast
2352 * reconnect. Send SYN_ACK immediately */
2353 n->ack_state = ACK_SEND_ACK;
2354 send_syn_ack_message (&n->primary_address,
2355 n->connect_ack_timestamp);
2357 case GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT:
2358 /* We are already connected and can thus send the ACK immediately;
2359 still, it can never hurt to have an alternative address, so also
2360 tell ATS about it */
2361 GNUNET_assert (NULL != n->primary_address.address);
2362 GNUNET_assert (NULL != n->primary_address.session);
2363 n->ack_state = ACK_SEND_ACK;
2364 send_syn_ack_message (&n->primary_address,
2367 case GNUNET_TRANSPORT_PS_DISCONNECT:
2368 /* Get rid of remains and re-try */
2370 n = setup_neighbour (peer);
2371 /* Remember the SYN time stamp for ACK message */
2372 n->ack_state = ACK_SEND_SYN_ACK;
2373 n->connect_ack_timestamp = ts;
2374 /* Request an address for the peer */
2375 set_state_and_timeout (n,
2376 GNUNET_TRANSPORT_PS_SYN_RECV_ATS,
2377 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
2379 case GNUNET_TRANSPORT_PS_DISCONNECT_FINISHED:
2380 /* should not be possible */
2384 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2385 "Unhandled state `%s'\n",
2386 GNUNET_TRANSPORT_ps2s (n->state));
2388 return GNUNET_SYSERR;
2395 * Check if the given @a address is the same that we are already
2396 * using for the respective neighbour. If so, update the bandwidth
2397 * assignment and possibly the session and return #GNUNET_OK.
2398 * If the new address is different from what the neighbour is
2399 * using right now, return #GNUNET_NO.
2401 * @param address address of the other peer,
2402 * @param session session to use or NULL if transport should initiate a session
2403 * @param bandwidth_in inbound quota to be used when connection is up,
2404 * 0 to disconnect from peer
2405 * @param bandwidth_out outbound quota to be used when connection is up,
2406 * 0 to disconnect from peer
2407 * @return #GNUNET_OK if we were able to just update the bandwidth and session,
2408 * #GNUNET_NO if more extensive changes are required (address changed)
2411 try_run_fast_ats_update (const struct GNUNET_HELLO_Address *address,
2412 struct Session *session,
2413 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
2414 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
2416 struct NeighbourMapEntry *n;
2418 n = lookup_neighbour (&address->peer);
2420 (NULL == n->primary_address.address) ||
2421 (0 != GNUNET_HELLO_address_cmp (address,
2422 n->primary_address.address)) )
2424 /* We are not really switching addresses, but merely adjusting
2425 session and/or bandwidth, can do fast ATS update! */
2426 if (session != n->primary_address.session)
2428 /* switch to a different session, but keeping same address; could
2429 happen if there is a 2nd inbound connection */
2430 n->primary_address.session = session;
2432 n->primary_address.bandwidth_in = bandwidth_in;
2433 n->primary_address.bandwidth_out = bandwidth_out;
2434 GST_neighbours_set_incoming_quota (&address->peer,
2436 send_outbound_quota (&address->peer,
2443 * We've been asked to switch addresses, and just now got the result
2444 * from the blacklist check to see if this is allowed.
2446 * @param cls the `struct BlacklistCheckSwitchContext` with
2447 * the information about the future address
2448 * @param peer the peer we may switch addresses on
2449 * @param result #GNUNET_NO if we are not allowed to use the new
2453 switch_address_bl_check_cont (void *cls,
2454 const struct GNUNET_PeerIdentity *peer,
2457 struct BlacklistCheckSwitchContext *blc_ctx = cls;
2458 struct GNUNET_TRANSPORT_PluginFunctions *papi;
2459 struct NeighbourMapEntry *n;
2461 if (result == GNUNET_NO)
2463 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2464 "Blacklist denied to switch to suggested address `%s' session %p for peer `%s'\n",
2465 GST_plugins_a2s (blc_ctx->address),
2467 GNUNET_i2s (&blc_ctx->address->peer));
2468 GNUNET_STATISTICS_update (GST_stats,
2469 "# ATS suggestions ignored (blacklist denied)",
2472 /* FIXME: tell plugin to force killing session here and now
2473 (note: _proper_ plugin API for this does not yet exist) */
2474 GST_ats_block_address (blc_ctx->address,
2479 papi = GST_plugins_find (blc_ctx->address->transport_name);
2480 GNUNET_assert (NULL != papi);
2482 if (NULL == blc_ctx->session)
2484 /* need to create a session, ATS only gave us an address */
2485 blc_ctx->session = papi->get_session (papi->cls,
2487 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2488 "Obtained new session for peer `%s' and address '%s': %p\n",
2489 GNUNET_i2s (&blc_ctx->address->peer),
2490 GST_plugins_a2s (blc_ctx->address),
2492 if (NULL != blc_ctx->session)
2493 GST_ats_new_session (blc_ctx->address,
2496 if (NULL == blc_ctx->session)
2498 /* session creation failed, bad!, fail! */
2499 GNUNET_STATISTICS_update (GST_stats,
2500 "# ATS suggestions ignored (failed to create session)",
2503 /* No session could be obtained, remove blacklist check and clean up */
2504 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2505 "Failed to obtain new session for peer `%s' and address '%s'\n",
2506 GNUNET_i2s (&blc_ctx->address->peer),
2507 GST_plugins_a2s (blc_ctx->address));
2508 GST_ats_block_address (blc_ctx->address,
2513 /* We did this check already before going into blacklist, but
2514 it is theoretically possible that the situation changed in
2515 the meantime, hence we check again here */
2517 try_run_fast_ats_update (blc_ctx->address,
2519 blc_ctx->bandwidth_in,
2520 blc_ctx->bandwidth_out))
2521 goto cleanup; /* was just a minor update, we're done */
2523 /* check if we also need to setup the neighbour entry */
2524 if (NULL == (n = lookup_neighbour (peer)))
2526 n = setup_neighbour (peer);
2527 n->state = GNUNET_TRANSPORT_PS_INIT_ATS;
2530 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2531 "Peer `%s' switches to address `%s'\n",
2532 GNUNET_i2s (&blc_ctx->address->peer),
2533 GST_plugins_a2s (blc_ctx->address));
2537 case GNUNET_TRANSPORT_PS_NOT_CONNECTED:
2539 GST_ats_block_address (blc_ctx->address,
2543 case GNUNET_TRANSPORT_PS_INIT_ATS:
2544 /* We requested an address and ATS suggests one:
2545 * set primary address and send SYN message*/
2546 set_primary_address (n,
2549 blc_ctx->bandwidth_in,
2550 blc_ctx->bandwidth_out);
2551 if (ACK_SEND_SYN_ACK == n->ack_state)
2553 /* Send pending SYN_ACK message */
2554 n->ack_state = ACK_SEND_ACK;
2555 send_syn_ack_message (&n->primary_address,
2556 n->connect_ack_timestamp);
2558 set_state_and_timeout (n,
2559 GNUNET_TRANSPORT_PS_SYN_SENT,
2560 GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT));
2561 send_syn (&n->primary_address);
2563 case GNUNET_TRANSPORT_PS_SYN_SENT:
2564 /* ATS suggested a new address while waiting for an SYN_ACK:
2565 * Switch and send new SYN */
2566 /* ATS suggests a different address, switch again */
2567 set_primary_address (n,
2570 blc_ctx->bandwidth_in,
2571 blc_ctx->bandwidth_out);
2572 if (ACK_SEND_SYN_ACK == n->ack_state)
2574 /* Send pending SYN_ACK message */
2575 n->ack_state = ACK_SEND_ACK;
2576 send_syn_ack_message (&n->primary_address,
2577 n->connect_ack_timestamp);
2579 set_state_and_timeout (n,
2580 GNUNET_TRANSPORT_PS_SYN_SENT,
2581 GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT));
2582 send_syn (&n->primary_address);
2584 case GNUNET_TRANSPORT_PS_SYN_RECV_ATS:
2585 /* We requested an address and ATS suggests one:
2586 * set primary address and send SYN_ACK message*/
2587 set_primary_address (n,
2590 blc_ctx->bandwidth_in,
2591 blc_ctx->bandwidth_out);
2592 /* Send an ACK message as a response to the SYN msg */
2593 set_state_and_timeout (n,
2594 GNUNET_TRANSPORT_PS_SYN_RECV_ACK,
2595 GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT));
2596 send_syn_ack_message (&n->primary_address,
2597 n->connect_ack_timestamp);
2598 if ( (ACK_SEND_SYN_ACK == n->ack_state) ||
2599 (ACK_UNDEFINED == n->ack_state) )
2600 n->ack_state = ACK_SEND_ACK;
2602 case GNUNET_TRANSPORT_PS_SYN_RECV_ACK:
2603 /* ATS asks us to switch while we were trying to connect; switch to new
2604 address and check blacklist again */
2605 if ( (ACK_SEND_SYN_ACK == n->ack_state) )
2607 n->ack_state = ACK_SEND_ACK;
2608 send_syn_ack_message (&n->primary_address,
2609 n->connect_ack_timestamp);
2611 set_primary_address (n,
2614 blc_ctx->bandwidth_in,
2615 blc_ctx->bandwidth_out);
2616 set_state_and_timeout (n,
2617 GNUNET_TRANSPORT_PS_SYN_RECV_ACK,
2618 GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT));
2620 case GNUNET_TRANSPORT_PS_CONNECTED:
2621 GNUNET_assert (NULL != n->primary_address.address);
2622 GNUNET_assert (NULL != n->primary_address.session);
2623 GNUNET_break (n->primary_address.session != blc_ctx->session);
2624 /* ATS asks us to switch a life connection; see if we can get
2625 a SYN_ACK on it before we actually do this! */
2626 set_alternative_address (n,
2629 blc_ctx->bandwidth_in,
2630 blc_ctx->bandwidth_out);
2631 set_state_and_timeout (n,
2632 GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT,
2633 GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT));
2634 GNUNET_STATISTICS_update (GST_stats,
2635 gettext_noop ("# Attempts to switch addresses"),
2638 send_syn (&n->alternative_address);
2640 case GNUNET_TRANSPORT_PS_RECONNECT_ATS:
2641 set_primary_address (n,
2644 blc_ctx->bandwidth_in,
2645 blc_ctx->bandwidth_out);
2646 if (ACK_SEND_SYN_ACK == n->ack_state)
2648 /* Send pending SYN_ACK message */
2649 n->ack_state = ACK_SEND_ACK;
2650 send_syn_ack_message (&n->primary_address,
2651 n->connect_ack_timestamp);
2653 set_state_and_timeout (n,
2654 GNUNET_TRANSPORT_PS_RECONNECT_SENT,
2655 GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT));
2656 send_syn (&n->primary_address);
2658 case GNUNET_TRANSPORT_PS_RECONNECT_SENT:
2659 /* ATS asks us to switch while we were trying to reconnect; switch to new
2660 address and send SYN again */
2661 set_primary_address (n,
2664 blc_ctx->bandwidth_in,
2665 blc_ctx->bandwidth_out);
2666 set_state_and_timeout (n,
2667 GNUNET_TRANSPORT_PS_RECONNECT_SENT,
2668 GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT));
2669 send_syn (&n->primary_address);
2671 case GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT:
2672 if ( (0 == GNUNET_HELLO_address_cmp (n->primary_address.address,
2673 blc_ctx->address)) &&
2674 (n->primary_address.session == blc_ctx->session) )
2676 /* ATS switches back to still-active session */
2677 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2678 "ATS double-switched, cleaning up alternative address\n");
2679 free_address (&n->alternative_address);
2680 set_state_and_timeout (n,
2681 GNUNET_TRANSPORT_PS_CONNECTED,
2685 /* ATS asks us to switch a life connection, send */
2686 set_alternative_address (n,
2689 blc_ctx->bandwidth_in,
2690 blc_ctx->bandwidth_out);
2691 set_state_and_timeout (n,
2692 GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT,
2693 GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT));
2694 send_syn (&n->alternative_address);
2696 case GNUNET_TRANSPORT_PS_DISCONNECT:
2697 /* not going to switch addresses while disconnecting */
2698 GNUNET_STATISTICS_update (GST_stats,
2699 "# ATS suggestion ignored (disconnecting)",
2703 case GNUNET_TRANSPORT_PS_DISCONNECT_FINISHED:
2707 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2708 "Unhandled state `%s'\n",
2709 GNUNET_TRANSPORT_ps2s (n->state));
2714 GNUNET_CONTAINER_DLL_remove (pending_bc_head,
2717 GNUNET_HELLO_address_free (blc_ctx->address);
2718 GNUNET_free (blc_ctx);
2723 * For the given peer, switch to this address.
2725 * Before accepting this addresses and actively using it, a blacklist check
2728 * If any check fails or the suggestion can somehow not be followed, we
2729 * MUST call #GST_ats_block_address() to tell ATS that the suggestion
2730 * could not be satisfied and force ATS to do something else.
2732 * @param address address of the other peer,
2733 * @param session session to use or NULL if transport should initiate a session
2734 * @param bandwidth_in inbound quota to be used when connection is up,
2735 * 0 to disconnect from peer
2736 * @param bandwidth_out outbound quota to be used when connection is up,
2737 * 0 to disconnect from peer
2740 GST_neighbours_switch_to_address (const struct GNUNET_HELLO_Address *address,
2741 struct Session *session,
2742 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
2743 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
2745 struct GST_BlacklistCheck *blc;
2746 struct BlacklistCheckSwitchContext *blc_ctx;
2748 GNUNET_assert (NULL != address->transport_name);
2750 try_run_fast_ats_update (address,
2756 /* Check if plugin is available */
2757 if (NULL == (GST_plugins_find (address->transport_name)))
2759 /* we don't have the plugin for this address */
2761 GST_ats_block_address (address,
2765 if ((NULL == session) &&
2766 (GNUNET_HELLO_address_check_option (address,
2767 GNUNET_HELLO_ADDRESS_INFO_INBOUND)))
2769 /* This is a inbound address and we do not have a session to use! */
2771 GST_ats_block_address (address,
2776 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2777 "ATS suggests address '%s' for peer `%s' at %u/%u speed\n",
2778 GST_plugins_a2s (address),
2779 GNUNET_i2s (&address->peer),
2780 (unsigned int) ntohl (bandwidth_in.value__),
2781 (unsigned int) ntohl (bandwidth_out.value__));
2783 /* Perform blacklist check */
2784 blc_ctx = GNUNET_new (struct BlacklistCheckSwitchContext);
2785 blc_ctx->address = GNUNET_HELLO_address_copy (address);
2786 blc_ctx->session = session;
2787 blc_ctx->bandwidth_in = bandwidth_in;
2788 blc_ctx->bandwidth_out = bandwidth_out;
2789 GNUNET_CONTAINER_DLL_insert (pending_bc_head,
2792 if (NULL != (blc = GST_blacklist_test_allowed (&address->peer,
2793 address->transport_name,
2794 &switch_address_bl_check_cont,
2803 * Function called to send network utilization data to ATS for
2804 * each active connection.
2807 * @param key peer we send utilization data for
2808 * @param value the `struct NeighbourMapEntry *` with data to send
2809 * @return #GNUNET_OK (continue to iterate)
2812 send_utilization_data (void *cls,
2813 const struct GNUNET_PeerIdentity *key,
2816 struct NeighbourMapEntry *n = value;
2817 struct GNUNET_ATS_Information atsi[4];
2820 struct GNUNET_TIME_Relative delta;
2822 if (GNUNET_YES != test_connected (n))
2824 delta = GNUNET_TIME_absolute_get_difference (n->last_util_transmission,
2825 GNUNET_TIME_absolute_get ());
2827 if ((0 != n->util_total_bytes_recv) && (0 != delta.rel_value_us))
2828 bps_in = (1000LL * 1000LL * n->util_total_bytes_recv) / (delta.rel_value_us);
2830 if ((0 != n->util_total_bytes_sent) && (0 != delta.rel_value_us))
2831 bps_out = (1000LL * 1000LL * n->util_total_bytes_sent) / delta.rel_value_us;
2834 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2835 "`%s' total: received %u Bytes/s, sent %u Bytes/s\n",
2839 atsi[0].type = htonl (GNUNET_ATS_UTILIZATION_OUT);
2840 atsi[0].value = htonl (bps_out);
2841 atsi[1].type = htonl (GNUNET_ATS_UTILIZATION_IN);
2842 atsi[1].value = htonl (bps_in);
2843 GST_ats_update_metrics (n->primary_address.address,
2844 n->primary_address.session,
2846 n->util_total_bytes_recv = 0;
2847 n->util_total_bytes_sent = 0;
2848 n->last_util_transmission = GNUNET_TIME_absolute_get ();
2854 * Task transmitting utilization in a regular interval
2856 * @param cls the 'struct NeighbourMapEntry' for which we are running
2857 * @param tc scheduler context (unused)
2860 utilization_transmission (void *cls,
2861 const struct GNUNET_SCHEDULER_TaskContext *tc)
2863 util_transmission_tk = NULL;
2864 GNUNET_CONTAINER_multipeermap_iterate (neighbours,
2865 &send_utilization_data,
2867 util_transmission_tk
2868 = GNUNET_SCHEDULER_add_delayed (UTIL_TRANSMISSION_INTERVAL,
2869 &utilization_transmission,
2875 * Track information about data we received from the
2876 * given address (used to notify ATS about our utilization
2877 * of allocated resources).
2879 * @param address the address we got data from
2880 * @param message the message we received (really only the size is used)
2883 GST_neighbours_notify_data_recv (const struct GNUNET_HELLO_Address *address,
2884 const struct GNUNET_MessageHeader *message)
2886 struct NeighbourMapEntry *n;
2888 n = lookup_neighbour (&address->peer);
2891 n->util_total_bytes_recv += ntohs (message->size);
2896 * Track information about data we transmitted using the given @a
2897 * address and @a session (used to notify ATS about our utilization of
2898 * allocated resources).
2900 * @param address the address we transmitted data to
2901 * @param session session we used to transmit data
2902 * @param message the message we sent (really only the size is used)
2905 GST_neighbours_notify_data_sent (const struct GNUNET_HELLO_Address *address,
2906 struct Session *session,
2909 struct NeighbourMapEntry *n;
2911 n = lookup_neighbour (&address->peer);
2914 if (n->primary_address.session != session)
2916 n->util_total_bytes_sent += size;
2921 * Master task run for every neighbour. Performs all of the time-related
2922 * activities (keep alive, send next message, disconnect if idle, finish
2923 * clean up after disconnect).
2925 * @param cls the 'struct NeighbourMapEntry' for which we are running
2926 * @param tc scheduler context (unused)
2929 master_task (void *cls,
2930 const struct GNUNET_SCHEDULER_TaskContext *tc)
2932 struct NeighbourMapEntry *n = cls;
2933 struct GNUNET_TIME_Relative delay;
2936 delay = GNUNET_TIME_absolute_get_remaining (n->timeout);
2937 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2938 "Master task runs for neighbour `%s' in state %s with timeout in %s\n",
2939 GNUNET_i2s (&n->id),
2940 GNUNET_TRANSPORT_ps2s(n->state),
2941 GNUNET_STRINGS_relative_time_to_string (delay,
2945 case GNUNET_TRANSPORT_PS_NOT_CONNECTED:
2946 /* invalid state for master task, clean up */
2950 case GNUNET_TRANSPORT_PS_INIT_ATS:
2951 if (0 == delay.rel_value_us)
2953 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2954 "Connection to `%s' timed out waiting for ATS to provide address\n",
2955 GNUNET_i2s (&n->id));
2960 case GNUNET_TRANSPORT_PS_SYN_SENT:
2961 if (0 == delay.rel_value_us)
2963 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2964 "Connection to `%s' timed out waiting for other peer to send SYN_ACK\n",
2965 GNUNET_i2s (&n->id));
2966 /* Remove address and request and additional one */
2967 unset_primary_address (n);
2968 set_state_and_timeout (n,
2969 GNUNET_TRANSPORT_PS_INIT_ATS,
2970 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
2974 case GNUNET_TRANSPORT_PS_SYN_RECV_ATS:
2975 if (0 == delay.rel_value_us)
2977 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2978 "Connection to `%s' timed out waiting ATS to provide address to use for SYN_ACK\n",
2979 GNUNET_i2s (&n->id));
2984 case GNUNET_TRANSPORT_PS_SYN_RECV_ACK:
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 ACK\n",
2989 GNUNET_i2s (&n->id));
2990 disconnect_neighbour (n);
2994 case GNUNET_TRANSPORT_PS_CONNECTED:
2995 if (0 == delay.rel_value_us)
2997 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2998 "Connection to `%s' timed out, missing KEEPALIVE_RESPONSEs\n",
2999 GNUNET_i2s (&n->id));
3000 disconnect_neighbour (n);
3003 try_transmission_to_peer (n);
3006 case GNUNET_TRANSPORT_PS_RECONNECT_ATS:
3007 if (0 == delay.rel_value_us)
3009 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3010 "Connection to `%s' timed out, waiting for ATS replacement address\n",
3011 GNUNET_i2s (&n->id));
3012 disconnect_neighbour (n);
3016 case GNUNET_TRANSPORT_PS_RECONNECT_SENT:
3017 if (0 == delay.rel_value_us)
3019 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3020 "Connection to `%s' timed out, waiting for other peer to SYN_ACK replacement address\n",
3021 GNUNET_i2s (&n->id));
3022 disconnect_neighbour (n);
3026 case GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT:
3027 if (0 == delay.rel_value_us)
3029 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3030 "Switch failed, cleaning up alternative address\n");
3031 free_address (&n->alternative_address);
3032 set_state_and_timeout (n,
3033 GNUNET_TRANSPORT_PS_CONNECTED,
3034 GNUNET_TIME_relative_to_absolute (SETUP_CONNECTION_TIMEOUT));
3036 try_transmission_to_peer (n);
3039 case GNUNET_TRANSPORT_PS_DISCONNECT:
3040 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3041 "Cleaning up connection to `%s' after sending DISCONNECT\n",
3042 GNUNET_i2s (&n->id));
3045 case GNUNET_TRANSPORT_PS_DISCONNECT_FINISHED:
3046 /* how did we get here!? */
3050 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3051 "Unhandled state `%s'\n",
3052 GNUNET_TRANSPORT_ps2s (n->state));
3056 delay = GNUNET_TIME_absolute_get_remaining (n->timeout);
3057 if ( (GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT == n->state) ||
3058 (GNUNET_TRANSPORT_PS_CONNECTED == n->state) )
3060 /* if we are *now* in one of the two states, we're sending
3061 keep alive messages, so we need to consider the keepalive
3062 delay, not just the connection timeout */
3063 delay = GNUNET_TIME_relative_min (GNUNET_TIME_absolute_get_remaining (n->keep_alive_time),
3066 if (NULL == n->task)
3067 n->task = GNUNET_SCHEDULER_add_delayed (delay,
3074 * Send a ACK message to the neighbour to confirm that we
3077 * @param n neighbour to send the ACK to
3080 send_session_ack_message (struct NeighbourMapEntry *n)
3082 struct GNUNET_MessageHeader msg;
3084 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3085 "Sending ACK message to peer `%s'\n",
3086 GNUNET_i2s (&n->id));
3088 msg.size = htons (sizeof (struct GNUNET_MessageHeader));
3089 msg.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK);
3090 (void) send_with_session (n,
3092 sizeof (struct GNUNET_MessageHeader),
3094 GNUNET_TIME_UNIT_FOREVER_REL,
3101 * We received a 'SESSION_SYN_ACK' message from the other peer.
3102 * Consider switching to it.
3104 * @param message possibly a `struct SessionConnectMessage` (check format)
3105 * @param peer identity of the peer to switch the address for
3106 * @param address address of the other peer, NULL if other peer
3108 * @param session session to use (or NULL)
3109 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
3112 GST_neighbours_handle_session_syn_ack (const struct GNUNET_MessageHeader *message,
3113 const struct GNUNET_HELLO_Address *address,
3114 struct Session *session)
3116 const struct TransportSynMessage *scm;
3117 struct GNUNET_TIME_Absolute ts;
3118 struct NeighbourMapEntry *n;
3120 if (ntohs (message->size) != sizeof (struct TransportSynMessage))
3122 GNUNET_break_op (0);
3123 return GNUNET_SYSERR;
3125 GNUNET_STATISTICS_update (GST_stats,
3127 ("# SYN_ACK messages received"),
3129 scm = (const struct TransportSynMessage *) message;
3130 GNUNET_break_op (ntohl (scm->reserved) == 0);
3131 if (NULL == (n = lookup_neighbour (&address->peer)))
3133 GNUNET_STATISTICS_update (GST_stats,
3135 ("# unexpected SYN_ACK messages (no peer)"),
3137 return GNUNET_SYSERR;
3139 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3140 "Received SYN_ACK message from peer `%s' in state %s/%s\n",
3141 GNUNET_i2s (&address->peer),
3142 GNUNET_TRANSPORT_ps2s (n->state),
3143 print_ack_state (n->ack_state));
3144 ts = GNUNET_TIME_absolute_ntoh (scm->timestamp);
3147 case GNUNET_TRANSPORT_PS_NOT_CONNECTED:
3150 return GNUNET_SYSERR;
3151 case GNUNET_TRANSPORT_PS_INIT_ATS:
3152 GNUNET_STATISTICS_update (GST_stats,
3153 gettext_noop ("# unexpected SYN_ACK messages (not ready)"),
3157 case GNUNET_TRANSPORT_PS_SYN_SENT:
3158 if (ts.abs_value_us != n->primary_address.connect_timestamp.abs_value_us)
3160 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3161 "SYN_ACK ignored as the timestamp does not match our SYN request\n");
3164 set_state_and_timeout (n,
3165 GNUNET_TRANSPORT_PS_CONNECTED,
3166 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
3167 set_primary_address (n,
3168 n->primary_address.address,
3169 n->primary_address.session,
3170 n->primary_address.bandwidth_in,
3171 n->primary_address.bandwidth_out);
3172 send_session_ack_message (n);
3174 case GNUNET_TRANSPORT_PS_SYN_RECV_ATS:
3175 case GNUNET_TRANSPORT_PS_SYN_RECV_ACK:
3176 GNUNET_STATISTICS_update (GST_stats,
3177 gettext_noop ("# unexpected SYN_ACK messages (not ready)"),
3181 case GNUNET_TRANSPORT_PS_CONNECTED:
3182 /* duplicate SYN_ACK, let's answer by duplicate ACK just in case */
3183 send_session_ack_message (n);
3185 case GNUNET_TRANSPORT_PS_RECONNECT_ATS:
3186 /* we didn't expect any SYN_ACK, as we are waiting for ATS
3187 to give us a new address... */
3188 GNUNET_STATISTICS_update (GST_stats,
3189 gettext_noop ("# unexpected SYN_ACK messages (waiting on ATS)"),
3193 case GNUNET_TRANSPORT_PS_RECONNECT_SENT:
3194 /* Reconnecting with new address address worked; go back to connected! */
3195 set_state_and_timeout (n,
3196 GNUNET_TRANSPORT_PS_CONNECTED,
3197 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
3198 send_session_ack_message (n);
3200 case GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT:
3201 /* new address worked; adopt it and go back to connected! */
3202 set_state_and_timeout (n,
3203 GNUNET_TRANSPORT_PS_CONNECTED,
3204 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
3205 GNUNET_break (GNUNET_NO == n->alternative_address.ats_active);
3207 /* Set primary addresses */
3208 set_primary_address (n,
3209 n->alternative_address.address,
3210 n->alternative_address.session,
3211 n->alternative_address.bandwidth_in,
3212 n->alternative_address.bandwidth_out);
3213 GNUNET_STATISTICS_update (GST_stats,
3214 gettext_noop ("# Successful attempts to switch addresses"),
3218 GNUNET_HELLO_address_free (n->alternative_address.address);
3219 memset (&n->alternative_address,
3221 sizeof (n->alternative_address));
3222 send_session_ack_message (n);
3224 case GNUNET_TRANSPORT_PS_DISCONNECT:
3225 GNUNET_STATISTICS_update (GST_stats,
3227 ("# unexpected SYN_ACK messages (disconnecting)"),
3229 return GNUNET_SYSERR;
3230 case GNUNET_TRANSPORT_PS_DISCONNECT_FINISHED:
3234 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3235 "Unhandled state `%s'\n",
3236 GNUNET_TRANSPORT_ps2s (n->state));
3238 return GNUNET_SYSERR;
3245 * A session was terminated. Take note; if needed, try to get
3246 * an alternative address from ATS.
3248 * @param peer identity of the peer where the session died
3249 * @param session session that is gone
3250 * @return #GNUNET_YES if this was a session used, #GNUNET_NO if
3251 * this session was not in use
3254 GST_neighbours_session_terminated (const struct GNUNET_PeerIdentity *peer,
3255 struct Session *session)
3257 struct NeighbourMapEntry *n;
3258 struct BlackListCheckContext *bcc;
3259 struct BlackListCheckContext *bcc_next;
3261 /* make sure to cancel all ongoing blacklist checks involving 'session' */
3263 while (NULL != (bcc = bcc_next))
3265 bcc_next = bcc->next;
3266 if (bcc->na.session == session)
3268 if (NULL != bcc->bc)
3269 GST_blacklist_test_cancel (bcc->bc);
3270 GNUNET_HELLO_address_free (bcc->na.address);
3271 GNUNET_CONTAINER_DLL_remove (bc_head,
3277 if (NULL == (n = lookup_neighbour (peer)))
3278 return GNUNET_NO; /* can't affect us */
3279 if (session != n->primary_address.session)
3281 /* Free alternative address */
3282 if (session == n->alternative_address.session)
3284 if (GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT == n->state)
3285 set_state_and_timeout (n,
3286 GNUNET_TRANSPORT_PS_CONNECTED,
3288 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3289 "Session died, cleaning up alternative address\n");
3290 free_address (&n->alternative_address);
3292 return GNUNET_NO; /* doesn't affect us further */
3295 n->expect_latency_response = GNUNET_NO;
3296 /* The session for neighbour's primary address died */
3299 case GNUNET_TRANSPORT_PS_NOT_CONNECTED:
3303 case GNUNET_TRANSPORT_PS_INIT_ATS:
3307 case GNUNET_TRANSPORT_PS_SYN_SENT:
3308 /* The session used to send the SYN terminated:
3309 * this implies a connect error*/
3310 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3311 "Failed to send SYN in %s with `%s' %p: session terminated\n",
3313 GST_plugins_a2s (n->primary_address.address),
3314 n->primary_address.session,
3317 /* Destroy the address since it cannot be used */
3318 unset_primary_address (n);
3319 set_state_and_timeout (n,
3320 GNUNET_TRANSPORT_PS_INIT_ATS,
3321 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
3323 case GNUNET_TRANSPORT_PS_SYN_RECV_ATS:
3324 case GNUNET_TRANSPORT_PS_SYN_RECV_ACK:
3325 /* error on inbound session; free neighbour entirely */
3328 case GNUNET_TRANSPORT_PS_CONNECTED:
3329 /* Our primary connection died, try a fast reconnect */
3330 unset_primary_address (n);
3331 set_state_and_timeout (n,
3332 GNUNET_TRANSPORT_PS_RECONNECT_ATS,
3333 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
3335 case GNUNET_TRANSPORT_PS_RECONNECT_ATS:
3336 /* we don't have an address, how can it go down? */
3339 case GNUNET_TRANSPORT_PS_RECONNECT_SENT:
3340 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3341 "Failed to send SYN in %s with `%s' %p: session terminated\n",
3343 GST_plugins_a2s (n->primary_address.address),
3344 n->primary_address.session,
3346 /* Destroy the address since it cannot be used */
3347 unset_primary_address (n);
3348 set_state_and_timeout (n,
3349 GNUNET_TRANSPORT_PS_RECONNECT_ATS,
3350 GNUNET_TIME_relative_to_absolute (ATS_RESPONSE_TIMEOUT));
3352 case GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT:
3353 /* primary went down while we were waiting for SYN_ACK on secondary;
3354 secondary as primary */
3356 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3357 "Connection `%s' %p to peer `%s' was terminated while switching, "
3358 "switching to alternative address `%s' %p\n",
3359 GST_plugins_a2s (n->primary_address.address),
3360 n->primary_address.session,
3362 GST_plugins_a2s (n->alternative_address.address),
3363 n->alternative_address.session);
3365 /* Destroy the inbound address since it cannot be used */
3366 free_address (&n->primary_address);
3367 n->primary_address = n->alternative_address;
3368 memset (&n->alternative_address,
3370 sizeof (struct NeighbourAddress));
3371 set_state_and_timeout (n,
3372 GNUNET_TRANSPORT_PS_RECONNECT_SENT,
3373 GNUNET_TIME_relative_to_absolute (FAST_RECONNECT_TIMEOUT));
3375 case GNUNET_TRANSPORT_PS_DISCONNECT:
3376 unset_primary_address (n);
3378 case GNUNET_TRANSPORT_PS_DISCONNECT_FINISHED:
3379 /* neighbour was freed and plugins told to terminate session */
3382 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3383 "Unhandled state `%s'\n",
3384 GNUNET_TRANSPORT_ps2s (n->state));
3388 if (NULL != n->task)
3389 GNUNET_SCHEDULER_cancel (n->task);
3390 n->task = GNUNET_SCHEDULER_add_now (&master_task, n);
3396 * We received a 'ACK' message from the other peer.
3397 * If we sent a 'SYN_ACK' last, this means we are now
3398 * connected. Otherwise, do nothing.
3400 * @param message possibly a 'struct SessionConnectMessage' (check format)
3401 * @param address address of the other peer
3402 * @param session session to use (or NULL)
3403 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
3406 GST_neighbours_handle_session_ack (const struct GNUNET_MessageHeader *message,
3407 const struct GNUNET_HELLO_Address *address,
3408 struct Session *session)
3410 struct NeighbourMapEntry *n;
3412 if (ntohs (message->size) != sizeof (struct GNUNET_MessageHeader))
3414 GNUNET_break_op (0);
3415 return GNUNET_SYSERR;
3417 GNUNET_STATISTICS_update (GST_stats,
3419 ("# ACK messages received"),
3421 if (NULL == (n = lookup_neighbour (&address->peer)))
3423 GNUNET_break_op (0);
3424 return GNUNET_SYSERR;
3426 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3427 "Received ACK for peer `%s' in state %s/%s\n",
3428 GNUNET_i2s (&address->peer),
3429 GNUNET_TRANSPORT_ps2s (n->state),
3430 print_ack_state (n->ack_state));
3432 /* Check if we are in a plausible state for having sent
3433 a SYN_ACK. If not, return, otherwise break.
3435 The remote peers sends a ACK as a response for a SYN_ACK
3439 - If a remote peer has sent a SYN, we responded with a SYN_ACK and
3440 now wait for the ACK to finally be connected
3441 - If we sent a SYN_ACK to this peer before */
3443 if ( (GNUNET_TRANSPORT_PS_SYN_RECV_ACK != n->state) &&
3444 (ACK_SEND_ACK != n->ack_state))
3446 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3447 "Received unexpected ACK message from peer `%s' in state %s/%s\n",
3448 GNUNET_i2s (&address->peer),
3449 GNUNET_TRANSPORT_ps2s (n->state),
3450 print_ack_state (n->ack_state));
3452 GNUNET_STATISTICS_update (GST_stats,
3453 gettext_noop ("# unexpected ACK messages"), 1,
3457 if (GNUNET_TRANSPORT_PS_SWITCH_SYN_SENT == n->state)
3459 /* We tried to switch addresses while being connect. We explicitly wait
3460 * for a SYN_ACK before going to GNUNET_TRANSPORT_PS_CONNECTED,
3461 * so we do not want to set the address as in use! */
3464 set_state_and_timeout (n,
3465 GNUNET_TRANSPORT_PS_CONNECTED,
3466 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
3468 /* Set primary address to used */
3469 set_primary_address (n,
3470 n->primary_address.address,
3471 n->primary_address.session,
3472 n->primary_address.bandwidth_in,
3473 n->primary_address.bandwidth_out);
3479 * Test if we're connected to the given peer.
3481 * @param target peer to test
3482 * @return #GNUNET_YES if we are connected, #GNUNET_NO if not
3485 GST_neighbours_test_connected (const struct GNUNET_PeerIdentity *target)
3487 return test_connected (lookup_neighbour (target));
3492 * Change the incoming quota for the given peer.
3494 * @param neighbour identity of peer to change qutoa for
3495 * @param quota new quota
3498 GST_neighbours_set_incoming_quota (const struct GNUNET_PeerIdentity *neighbour,
3499 struct GNUNET_BANDWIDTH_Value32NBO quota)
3501 struct NeighbourMapEntry *n;
3503 if (NULL == (n = lookup_neighbour (neighbour)))
3505 GNUNET_STATISTICS_update (GST_stats,
3507 ("# SET QUOTA messages ignored (no such peer)"),
3511 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3512 "Setting inbound quota of %u Bps for peer `%s' to all clients\n",
3513 ntohl (quota.value__), GNUNET_i2s (&n->id));
3514 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker, quota);
3515 if (0 != ntohl (quota.value__))
3517 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3518 "Disconnecting peer `%4s' due to SET_QUOTA\n",
3519 GNUNET_i2s (&n->id));
3520 if (GNUNET_YES == test_connected (n))
3521 GNUNET_STATISTICS_update (GST_stats,
3522 gettext_noop ("# disconnects due to quota of 0"),
3524 disconnect_neighbour (n);
3529 * Task to asynchronously run #free_neighbour().
3531 * @param cls the `struct NeighbourMapEntry` to free
3535 delayed_disconnect (void *cls,
3536 const struct GNUNET_SCHEDULER_TaskContext* tc)
3538 struct NeighbourMapEntry *n = cls;
3540 n->delayed_disconnect_task = NULL;
3541 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3542 "Disconnecting by request from peer %s\n",
3543 GNUNET_i2s (&n->id));
3549 * We received a disconnect message from the given peer,
3550 * validate and process.
3552 * @param peer sender of the message
3553 * @param msg the disconnect message
3556 GST_neighbours_handle_disconnect_message (const struct GNUNET_PeerIdentity *peer,
3557 const struct GNUNET_MessageHeader *msg)
3559 struct NeighbourMapEntry *n;
3560 const struct SessionDisconnectMessage *sdm;
3562 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3563 "Received DISCONNECT message from peer `%s'\n",
3565 if (ntohs (msg->size) != sizeof (struct SessionDisconnectMessage))
3567 GNUNET_break_op (0);
3568 GNUNET_STATISTICS_update (GST_stats,
3570 ("# disconnect messages ignored (malformed)"), 1,
3574 GNUNET_STATISTICS_update (GST_stats,
3576 ("# DISCONNECT messages received"),
3578 sdm = (const struct SessionDisconnectMessage *) msg;
3579 if (NULL == (n = lookup_neighbour (peer)))
3584 if (GNUNET_TIME_absolute_ntoh (sdm->timestamp).abs_value_us <= n->connect_ack_timestamp.abs_value_us)
3586 GNUNET_STATISTICS_update (GST_stats,
3587 gettext_noop ("# disconnect messages ignored (timestamp)"),
3592 if (0 != memcmp (peer,
3594 sizeof (struct GNUNET_PeerIdentity)))
3596 GNUNET_break_op (0);
3599 if (ntohl (sdm->purpose.size) !=
3600 sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
3601 sizeof (struct GNUNET_CRYPTO_EddsaPublicKey) +
3602 sizeof (struct GNUNET_TIME_AbsoluteNBO))
3604 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3605 "DISCONNECT message from peer `%s' has invalid size\n",
3607 GNUNET_break_op (0);
3611 GNUNET_CRYPTO_eddsa_verify (GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT,
3616 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3617 "DISCONNECT message from peer `%s' cannot be verified \n",
3619 GNUNET_break_op (0);
3622 n->delayed_disconnect_task = GNUNET_SCHEDULER_add_now (&delayed_disconnect, n);
3627 * Closure for the #neighbours_iterate() function.
3629 struct IteratorContext
3632 * Function to call on each connected neighbour.
3634 GST_NeighbourIterator cb;
3637 * Closure for @e cb.
3644 * Call the callback from the closure for each neighbour.
3646 * @param cls the `struct IteratorContext`
3647 * @param key the hash of the public key of the neighbour
3648 * @param value the `struct NeighbourMapEntry`
3649 * @return #GNUNET_OK (continue to iterate)
3652 neighbours_iterate (void *cls,
3653 const struct GNUNET_PeerIdentity *key,
3656 struct IteratorContext *ic = cls;
3657 struct NeighbourMapEntry *n = value;
3658 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in;
3659 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out;
3661 if (NULL != n->primary_address.address)
3663 bandwidth_in = n->primary_address.bandwidth_in;
3664 bandwidth_out = n->primary_address.bandwidth_out;
3668 bandwidth_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
3669 bandwidth_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
3673 n->primary_address.address,
3676 bandwidth_in, bandwidth_out);
3682 * Iterate over all connected neighbours.
3684 * @param cb function to call
3685 * @param cb_cls closure for cb
3688 GST_neighbours_iterate (GST_NeighbourIterator cb, void *cb_cls)
3690 struct IteratorContext ic;
3692 if (NULL == neighbours)
3693 return; /* can happen during shutdown */
3696 GNUNET_CONTAINER_multipeermap_iterate (neighbours,
3697 &neighbours_iterate,
3703 * If we have an active connection to the given target, it must be shutdown.
3705 * @param target peer to disconnect from
3708 GST_neighbours_force_disconnect (const struct GNUNET_PeerIdentity *target)
3710 struct NeighbourMapEntry *n;
3712 if (NULL == (n = lookup_neighbour (target)))
3713 return; /* not active */
3714 if (GNUNET_YES == test_connected (n))
3715 GNUNET_STATISTICS_update (GST_stats,
3716 gettext_noop ("# disconnected from peer upon explicit request"),
3719 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3720 "Forced disconnect from peer %s\n",
3721 GNUNET_i2s (target));
3722 disconnect_neighbour (n);
3727 * Obtain current address information for the given neighbour.
3730 * @return address currently used
3732 struct GNUNET_HELLO_Address *
3733 GST_neighbour_get_current_address (const struct GNUNET_PeerIdentity *peer)
3735 struct NeighbourMapEntry *n;
3737 n = lookup_neighbour (peer);
3740 return n->primary_address.address;
3745 * Initialize the neighbours subsystem.
3747 * @param max_fds maximum number of fds to use
3750 GST_neighbours_start (unsigned int max_fds)
3752 neighbours = GNUNET_CONTAINER_multipeermap_create (NEIGHBOUR_TABLE_SIZE,
3754 util_transmission_tk = GNUNET_SCHEDULER_add_delayed (UTIL_TRANSMISSION_INTERVAL,
3755 &utilization_transmission,
3761 * Disconnect from the given neighbour.
3764 * @param key hash of neighbour's public key (not used)
3765 * @param value the 'struct NeighbourMapEntry' of the neighbour
3766 * @return #GNUNET_OK (continue to iterate)
3769 disconnect_all_neighbours (void *cls,
3770 const struct GNUNET_PeerIdentity *key,
3773 struct NeighbourMapEntry *n = value;
3775 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3776 "Disconnecting peer `%4s' during shutdown\n",
3777 GNUNET_i2s (&n->id));
3784 * Cleanup the neighbours subsystem.
3787 GST_neighbours_stop ()
3789 struct BlacklistCheckSwitchContext *cur;
3790 struct BlacklistCheckSwitchContext *next;
3792 if (NULL == neighbours)
3794 if (NULL != util_transmission_tk)
3796 GNUNET_SCHEDULER_cancel (util_transmission_tk);
3797 util_transmission_tk = NULL;
3799 GNUNET_CONTAINER_multipeermap_iterate (neighbours,
3800 &disconnect_all_neighbours,
3802 GNUNET_CONTAINER_multipeermap_destroy (neighbours);
3804 next = pending_bc_head;
3805 for (cur = next; NULL != cur; cur = next)
3808 GNUNET_CONTAINER_DLL_remove (pending_bc_head,
3812 if (NULL != cur->blc)
3814 GST_blacklist_test_cancel (cur->blc);
3817 if (NULL != cur->address)
3818 GNUNET_HELLO_address_free (cur->address);
3824 /* end of file gnunet-service-transport_neighbours.c */