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21 * @file include/gnunet_ats_service.h
22 * @brief automatic transport selection and outbound bandwidth determination
23 * @author Christian Grothoff
24 * @author Matthias Wachs
26 #ifndef GNUNET_ATS_SERVICE_H
27 #define GNUNET_ATS_SERVICE_H
29 #include "gnunet_constants.h"
30 #include "gnunet_util_lib.h"
31 #include "gnunet_hello_lib.h"
34 * Number of network types supported by ATS
36 #define GNUNET_ATS_NetworkTypeCount 6
40 * Types of networks (with separate quotas) we support.
42 enum GNUNET_ATS_Network_Type
45 * Category of last resort.
47 GNUNET_ATS_NET_UNSPECIFIED = 0,
50 * Loopback (same host).
52 GNUNET_ATS_NET_LOOPBACK = 1,
57 GNUNET_ATS_NET_LAN = 2,
60 * Wide area network (i.e. Internet)
62 GNUNET_ATS_NET_WAN = 3,
65 * Wireless LAN (i.e. 802.11abgn)
67 GNUNET_ATS_NET_WLAN = 4,
77 * ATS network types as array initializer
79 #define GNUNET_ATS_NetworkType { GNUNET_ATS_NET_UNSPECIFIED, GNUNET_ATS_NET_LOOPBACK, GNUNET_ATS_NET_LAN, GNUNET_ATS_NET_WAN, GNUNET_ATS_NET_WLAN, GNUNET_ATS_NET_BT }
84 * Default bandwidth assigned to a network : 64 KB/s
86 #define GNUNET_ATS_DefaultBandwidth 65536
89 * Undefined value for an `enum GNUNET_ATS_Property`
91 #define GNUNET_ATS_VALUE_UNDEFINED UINT32_MAX
94 * String representation for GNUNET_ATS_VALUE_UNDEFINED
96 #define GNUNET_ATS_VALUE_UNDEFINED_STR "undefined"
99 * Maximum bandwidth assigned to a network : 4095 MB/s
101 #define GNUNET_ATS_MaxBandwidth UINT32_MAX
104 * Textual equivalent for GNUNET_ATS_MaxBandwidth
106 #define GNUNET_ATS_MaxBandwidthString "unlimited"
109 * Number of property types supported by ATS
111 #define GNUNET_ATS_PropertyCount 11
115 * Enum defining all known property types for ATS Enum values are used
116 * in the GNUNET_ATS_Information struct as
119 * Cost are always stored in uint32_t, so all units used to define costs
120 * have to be normalized to fit in uint32_t [0 .. UINT32_MAX-1]
122 * UINT32_MAX is reserved for uninitialized values #GNUNET_ATS_VALUE_UNDEFINED
124 enum GNUNET_ATS_Property
131 GNUNET_ATS_ARRAY_TERMINATOR = 0,
134 * Actual traffic on this connection from this peer to the other peer.
135 * Includes transport overhead
137 * Unit: [bytes/second]
139 GNUNET_ATS_UTILIZATION_OUT,
142 * Actual traffic on this connection from the other peer to this peer.
143 * Includes transport overhead
145 * Unit: [bytes/second]
147 GNUNET_ATS_UTILIZATION_IN,
150 * Actual traffic on this connection from this peer to the other peer.
151 * Only payload from layers > transport
153 * Unit: [bytes/second]
155 GNUNET_ATS_UTILIZATION_PAYLOAD_OUT,
158 * Actual traffic on this connection from the other peer to this peer.
159 * Only payload from layers > transport
161 * Unit: [bytes/second]
163 GNUNET_ATS_UTILIZATION_PAYLOAD_IN,
166 * Is this address located in WAN, LAN or a loopback address
167 * Value is element of GNUNET_ATS_Network_Type
169 GNUNET_ATS_NETWORK_TYPE,
173 * Time between when the time packet is sent and the packet arrives
175 * Unit: [microseconds]
183 GNUNET_ATS_QUALITY_NET_DELAY,
186 * Distance on network layer (required for distance-vector routing).
190 GNUNET_ATS_QUALITY_NET_DISTANCE,
193 * Network overhead on WAN (Wide-Area Network)
195 * How many bytes are sent on the WAN when 1 kilobyte (1024 bytes)
196 * of application data is transmitted?
197 * A factor used with connect cost, bandwidth cost and energy cost
198 * to describe the overhead produced by the transport protocol
202 * Interpretation: less is better
206 * TCP/IPv4 over Ethernet: 1024 + 38 + 20 + 20 = 1102 [bytes/kb]
207 * TCP/IPv6 over Ethernet: 1024 + 38 + 20 + 40 = 1122 [bytes/kb]
208 * UDP/IPv4 over Ethernet: 1024 + 38 + 20 + 8 = 1090 [bytes/kb]
209 * UDP/IPv6 over Ethernet: 1024 + 38 + 40 + 8 = 1110 [bytes/kb]
214 * Network overhead on LAN (Local-Area Network)
216 * How many bytes are sent on the LAN when 1 kilobyte (1024 bytes)
217 * of application data is transmitted?
218 * A factor used with connect cost, bandwidth cost and energy cost
219 * to describe the overhead produced by the transport protocol
223 * Interpretation: less is better
227 * TCP/IPv4 over Ethernet: 1024 + 38 + 20 + 20 = 1102 [bytes/kb]
228 * TCP/IPv6 over Ethernet: 1024 + 38 + 20 + 40 = 1122 [bytes/kb]
229 * UDP/IPv4 over Ethernet: 1024 + 38 + 20 + 8 = 1090 [bytes/kb]
230 * UDP/IPv6 over Ethernet: 1024 + 38 + 40 + 8 = 1110 [bytes/kb]
235 * Network overhead on WLAN (Wireless Local Area Network)
237 * How many bytes are sent on the LAN when 1 kilobyte (1024 bytes)
238 * of application data is transmitted?
239 * A factor used with connect cost, bandwidth cost and energy cost
240 * to describe the overhead produced by the transport protocol
244 * Interpretation: less is better
248 * TCP/IPv4 over Ethernet: 1024 + 38 + 20 + 20 = 1102 [bytes/kb]
249 * TCP/IPv6 over Ethernet: 1024 + 38 + 20 + 40 = 1122 [bytes/kb]
250 * UDP/IPv4 over Ethernet: 1024 + 38 + 20 + 8 = 1090 [bytes/kb]
251 * UDP/IPv6 over Ethernet: 1024 + 38 + 40 + 8 = 1110 [bytes/kb]
259 * Number of ATS quality properties
261 #define GNUNET_ATS_QualityPropertiesCount 2
264 * ATS quality properties as array initializer
266 #define GNUNET_ATS_QualityProperties { GNUNET_ATS_QUALITY_NET_DELAY, GNUNET_ATS_QUALITY_NET_DISTANCE }
269 * ATS quality properties as string array initializer
271 #define GNUNET_ATS_QualityPropertiesString {"Delay", "Distance"}
273 GNUNET_NETWORK_STRUCT_BEGIN
276 * struct used to communicate the transport's properties like cost and
277 * quality of service as well as high-level constraints on resource
281 * +-----------+ Constraints | | Plugin properties +---------+
282 * | Highlevel |------------> |ATS| <------------------|Transport|
283 * | Component | ATS struct | | ATS struct | Plugin |
284 * +-----------+ | | +---------+
287 * This structure will be used by transport plugins to communicate
288 * costs to ATS or by higher level components to tell ATS their
289 * constraints. Always a pair of (GNUNET_ATS_Property,
290 * uint32_t value). Value is always uint32_t, so all units used to
291 * define costs have to be normalized to fit uint32_t.
293 struct GNUNET_ATS_Information
296 * ATS property type, in network byte order.
298 uint32_t type GNUNET_PACKED;
301 * ATS property value, in network byte order.
303 uint32_t value GNUNET_PACKED;
305 GNUNET_NETWORK_STRUCT_END
307 /* ******************************** Scheduling API ***************************** */
310 * Handle to the ATS subsystem for bandwidth/transport scheduling information.
312 struct GNUNET_ATS_SchedulingHandle;
315 * Handle for address suggestion requests
317 struct GNUNET_ATS_SuggestHandle;
320 * Opaque session handle, defined by plugins. Contents not known to ATS.
325 * Signature of a function called by ATS with the current bandwidth
326 * and address preferences as determined by ATS.
329 * @param address suggested address (including peer identity of the peer)
330 * @param session session to use, NULL to establish a new outgoing session
331 * @param bandwidth_out assigned outbound bandwidth for the connection,
333 * @param bandwidth_in assigned inbound bandwidth for the connection,
337 (*GNUNET_ATS_AddressSuggestionCallback) (void *cls,
338 const struct GNUNET_PeerIdentity *peer,
339 const struct GNUNET_HELLO_Address *address,
340 struct Session *session,
341 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
342 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in);
346 * Initialize the ATS subsystem.
348 * @param cfg configuration to use
349 * @param suggest_cb notification to call whenever the suggestation changed
350 * @param suggest_cb_cls closure for @a suggest_cb
351 * @return ats context
353 struct GNUNET_ATS_SchedulingHandle *
354 GNUNET_ATS_scheduling_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
355 GNUNET_ATS_AddressSuggestionCallback suggest_cb, void *suggest_cb_cls);
359 * Client is done with ATS scheduling, release resources.
361 * @param sh handle to release
364 GNUNET_ATS_scheduling_done (struct GNUNET_ATS_SchedulingHandle *sh);
368 * We would like to reset the address suggestion block time for this
372 * @param peer identity of the peer we want to reset
375 GNUNET_ATS_reset_backoff (struct GNUNET_ATS_SchedulingHandle *sh,
376 const struct GNUNET_PeerIdentity *peer);
380 * We would like to establish a new connection with a peer. ATS
381 * should suggest a good address to begin with.
384 * @param peer identity of the peer we need an address for
385 * @return suggestion handle, NULL if a request is already pending
387 struct GNUNET_ATS_SuggestHandle *
388 GNUNET_ATS_suggest_address (struct GNUNET_ATS_SchedulingHandle *sh,
389 const struct GNUNET_PeerIdentity *peer);
393 * We want to cancel ATS suggesting addresses for a peer.
396 * @param peer identity of the peer
399 GNUNET_ATS_suggest_address_cancel (struct GNUNET_ATS_SchedulingHandle *sh,
400 const struct GNUNET_PeerIdentity *peer);
404 * Convert a ATS property to a string
406 * @param type the property type
407 * @return a string or NULL if invalid
410 GNUNET_ATS_print_property_type (enum GNUNET_ATS_Property type);
414 * Convert a `enum GNUNET_ATS_Network_Type` to a string
416 * @param net the network type
417 * @return a string or NULL if invalid
420 GNUNET_ATS_print_network_type (enum GNUNET_ATS_Network_Type net);
424 * Returns where the address is located: LAN or WAN or ...
426 * @param sh the `struct GNUNET_ATS_SchedulingHandle` handle
427 * @param addr address
428 * @param addrlen address length
429 * @return type of the network the address belongs to
431 enum GNUNET_ATS_Network_Type
432 GNUNET_ATS_address_get_type (struct GNUNET_ATS_SchedulingHandle *sh,
433 const struct sockaddr *addr,
438 * Test if a address and a session is known to ATS.
440 * @param sh the scheduling handle
441 * @param address the address
442 * @param session the session
443 * @return #GNUNET_YES or #GNUNET_NO
446 GNUNET_ATS_session_known (struct GNUNET_ATS_SchedulingHandle *sh,
447 const struct GNUNET_HELLO_Address *address,
448 struct Session *session);
452 * We have a new address ATS should know. Addresses have to be added with this
453 * function before they can be: updated, set in use and destroyed
456 * @param address the address
457 * @param session session handle (if available)
458 * @param ats performance data for the address
459 * @param ats_count number of performance records in @a ats
462 GNUNET_ATS_address_add (struct GNUNET_ATS_SchedulingHandle *sh,
463 const struct GNUNET_HELLO_Address *address,
464 struct Session *session,
465 const struct GNUNET_ATS_Information *ats,
470 * We have updated performance statistics for a given address. Note
471 * that this function can be called for addresses that are currently
472 * in use as well as addresses that are valid but not actively in use.
473 * Furthermore, the peer may not even be connected to us right now (in
474 * which case the call may be ignored or the information may be stored
475 * for later use). Update bandwidth assignments.
478 * @param address updated address
479 * @param session session handle (if available)
480 * @param ats performance data for the address
481 * @param ats_count number of performance records in @a ats
482 * @return #GNUNET_OK or #GNUNET_SYSERR
485 GNUNET_ATS_address_update (struct GNUNET_ATS_SchedulingHandle *sh,
486 const struct GNUNET_HELLO_Address *address,
487 struct Session *session,
488 const struct GNUNET_ATS_Information *ats,
493 * An address is now in use or not used any more.
496 * @param address the address
497 * @param session session handle
498 * @param in_use #GNUNET_YES if this address is now used, #GNUNET_NO
499 * if address is not used any more
502 GNUNET_ATS_address_in_use (struct GNUNET_ATS_SchedulingHandle *sh,
503 const struct GNUNET_HELLO_Address *address,
504 struct Session *session,
509 * An address got destroyed, stop including it as a valid address.
511 * If a session is given, only the session will be removed, if no session is
512 * given the full address will be deleted.
515 * @param address the address
516 * @param session session handle that is no longer valid (if available)
519 GNUNET_ATS_address_destroyed (struct GNUNET_ATS_SchedulingHandle *sh,
520 const struct GNUNET_HELLO_Address *address,
521 struct Session *session);
524 /* ******************************** Performance API ***************************** */
527 * ATS Handle to obtain and/or modify performance information.
529 struct GNUNET_ATS_PerformanceHandle;
532 * Signature of a function that is called with QoS information about an address.
535 * @param address the address, NULL if ATS service was disconnected
536 * @param address_active #GNUNET_YES if this address is actively used
537 * to maintain a connection to a peer;
538 * #GNUNET_NO if the address is not actively used;
539 * #GNUNET_SYSERR if this address is no longer available for ATS
540 * @param bandwidth_out assigned outbound bandwidth for the connection
541 * @param bandwidth_in assigned inbound bandwidth for the connection
542 * @param ats performance data for the address (as far as known)
543 * @param ats_count number of performance records in @a ats
546 (*GNUNET_ATS_AddressInformationCallback) (void *cls,
547 const struct GNUNET_HELLO_Address *address,
549 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
550 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
551 const struct GNUNET_ATS_Information *ats,
556 * Handle for an address listing operation
558 struct GNUNET_ATS_AddressListHandle;
562 * Get handle to access performance API of the ATS subsystem.
564 * @param cfg configuration to use
565 * @param addr_info_cb callback called when performance characteristics for
567 * @param addr_info_cb_cls closure for @a addr_info_cb
568 * @return ats performance context
570 struct GNUNET_ATS_PerformanceHandle *
571 GNUNET_ATS_performance_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
572 GNUNET_ATS_AddressInformationCallback addr_info_cb,
573 void *addr_info_cb_cls);
578 * Get information about addresses known to the ATS subsystem.
580 * @param handle the performance handle to use
581 * @param peer peer idm can be NULL for all peers
582 * @param all GNUNET_YES to get information about all addresses or GNUNET_NO to
583 * get only address currently used
584 * @param infocb callback to call with the addresses,
585 * will callback with address == NULL when done
586 * @param infocb_cls closure for @a infocb
587 * @return ats performance context
589 struct GNUNET_ATS_AddressListHandle *
590 GNUNET_ATS_performance_list_addresses (struct GNUNET_ATS_PerformanceHandle *handle,
591 const struct GNUNET_PeerIdentity *peer,
593 GNUNET_ATS_AddressInformationCallback infocb,
598 * Cancel a pending address listing operation
600 * @param handle the `struct GNUNET_ATS_AddressListHandle` handle to cancel
603 GNUNET_ATS_performance_list_addresses_cancel (struct GNUNET_ATS_AddressListHandle *handle);
607 * Client is done using the ATS performance subsystem, release resources.
612 GNUNET_ATS_performance_done (struct GNUNET_ATS_PerformanceHandle *ph);
616 * Function called with reservation result.
619 * @param peer identifies the peer
620 * @param amount set to the amount that was actually reserved or unreserved;
621 * either the full requested amount or zero (no partial reservations)
622 * @param res_delay if the reservation could not be satisfied (amount was 0), how
623 * long should the client wait until re-trying?
626 (*GNUNET_ATS_ReservationCallback) (void *cls,
627 const struct GNUNET_PeerIdentity * peer,
629 struct GNUNET_TIME_Relative res_delay);
633 * Context that can be used to cancel a peer information request.
635 struct GNUNET_ATS_ReservationContext;
639 * Reserve inbound bandwidth from the given peer. ATS will look at
640 * the current amount of traffic we receive from the peer and ensure
641 * that the peer could add 'amount' of data to its stream.
643 * @param ph performance handle
644 * @param peer identifies the peer
645 * @param amount reserve N bytes for receiving, negative
646 * amounts can be used to undo a (recent) reservation;
647 * @param rcb function to call with the resulting reservation information
648 * @param rcb_cls closure for info
649 * @return NULL on error
650 * @deprecated will be replaced soon
652 struct GNUNET_ATS_ReservationContext *
653 GNUNET_ATS_reserve_bandwidth (struct GNUNET_ATS_PerformanceHandle *ph,
654 const struct GNUNET_PeerIdentity *peer, int32_t amount,
655 GNUNET_ATS_ReservationCallback rcb, void *rcb_cls);
659 * Cancel request for reserving bandwidth.
661 * @param rc context returned by the original GNUNET_ATS_reserve_bandwidth call
664 GNUNET_ATS_reserve_bandwidth_cancel (struct GNUNET_ATS_ReservationContext *rc);
667 * Number of preference types supported by ATS
669 #define GNUNET_ATS_PreferenceCount 3
672 * ATS preference types as array initializer
674 #define GNUNET_ATS_PreferenceType {GNUNET_ATS_PREFERENCE_END, GNUNET_ATS_PREFERENCE_BANDWIDTH, GNUNET_ATS_PREFERENCE_LATENCY}
677 * ATS preference types as string array initializer
679 #define GNUNET_ATS_PreferenceTypeString {"END", "BANDWIDTH", "LATENCY"}
682 * Enum defining all known preference categories.
684 enum GNUNET_ATS_PreferenceKind
688 * End of preference list.
690 GNUNET_ATS_PREFERENCE_END = 0,
693 * Change the peer's bandwidth value (value per byte of bandwidth in
694 * the goal function) to the given amount. The argument is followed
695 * by a double value giving the desired value (can be negative).
696 * Preference changes are forgotten if peers disconnect.
698 GNUNET_ATS_PREFERENCE_BANDWIDTH,
701 * Change the peer's latency value to the given amount. The
702 * argument is followed by a double value giving the desired value
703 * (can be negative). The absolute score in the goal function is
704 * the inverse of the latency in microseconds (minimum: 1
705 * microsecond) multiplied by the latency preferences.
707 GNUNET_ATS_PREFERENCE_LATENCY
711 * Convert a GNUNET_ATS_PreferenceType to a string
713 * @param type the preference type
714 * @return a string or NULL if invalid
717 GNUNET_ATS_print_preference_type (uint32_t type);
721 * Change preferences for the given peer. Preference changes are forgotten if peers
724 * @param ph performance handle
725 * @param peer identifies the peer
726 * @param ... 0-terminated specification of the desired changes
729 GNUNET_ATS_performance_change_preference (struct GNUNET_ATS_PerformanceHandle *ph,
730 const struct GNUNET_PeerIdentity *peer, ...);
734 * Application feedback on how good preference requirements are fulfilled
735 * for the preferences included in the given time scope [now - scope .. now]
737 * An application notifies ATS if (and only if) it has feedback information
738 * for specific properties. This values are valid until the feedback scores are
739 * updated by the application.
741 * If the application has no feedback for this preference kind the application
742 * will not explicitly call for this property and will not include it in this
745 * @param ph performance handle
746 * @param scope the time interval this valid for: [now - scope .. now]
747 * @param peer identifies the peer
748 * @param ... 0-terminated specification of the desired changes
751 GNUNET_ATS_performance_give_feedback (struct GNUNET_ATS_PerformanceHandle *ph,
752 const struct GNUNET_PeerIdentity *peer,
753 const struct GNUNET_TIME_Relative scope, ...);
756 /* end of file gnunet-service-transport_ats.h */