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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.
328 * If an address is available immediately the address will be included. If no
329 * address can be suggested, address, session, bandwidth and ATS information will
330 * be NULL/0. ATS will suggest an address as soon as it can provide such an
334 * @param address suggested address (including peer identity of the peer)
335 * @param session session to use
336 * @param bandwidth_out assigned outbound bandwidth for the connection
337 * @param bandwidth_in assigned inbound bandwidth for the connection
338 * @param ats performance data for the address (as far as known)
339 * @param ats_count number of performance records in @a ats
342 (*GNUNET_ATS_AddressSuggestionCallback) (void *cls,
343 const struct GNUNET_PeerIdentity *peer,
344 const struct GNUNET_HELLO_Address *address,
345 struct Session *session,
346 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
347 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
348 const struct GNUNET_ATS_Information *ats, uint32_t ats_count);
352 * Initialize the ATS subsystem.
354 * @param cfg configuration to use
355 * @param suggest_cb notification to call whenever the suggestation changed
356 * @param suggest_cb_cls closure for @a suggest_cb
357 * @return ats context
359 struct GNUNET_ATS_SchedulingHandle *
360 GNUNET_ATS_scheduling_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
361 GNUNET_ATS_AddressSuggestionCallback suggest_cb, void *suggest_cb_cls);
365 * Client is done with ATS scheduling, release resources.
367 * @param sh handle to release
370 GNUNET_ATS_scheduling_done (struct GNUNET_ATS_SchedulingHandle *sh);
374 * We would like to reset the address suggestion block time for this
378 * @param peer identity of the peer we want to reset
381 GNUNET_ATS_reset_backoff (struct GNUNET_ATS_SchedulingHandle *sh,
382 const struct GNUNET_PeerIdentity *peer);
386 * We would like to establish a new connection with a peer. ATS
387 * should suggest a good address to begin with.
390 * @param peer identity of the peer we need an address for
391 * @return suggestion handle
393 struct GNUNET_ATS_SuggestHandle *
394 GNUNET_ATS_suggest_address (struct GNUNET_ATS_SchedulingHandle *sh,
395 const struct GNUNET_PeerIdentity *peer);
399 * We want to cancel ATS suggesting addresses for a peer.
402 * @param peer identity of the peer
405 GNUNET_ATS_suggest_address_cancel (struct GNUNET_ATS_SchedulingHandle *sh,
406 const struct GNUNET_PeerIdentity *peer);
410 * Convert a ATS property to a string
412 * @param type the property type
413 * @return a string or NULL if invalid
416 GNUNET_ATS_print_property_type (enum GNUNET_ATS_Property type);
420 * Convert a `enum GNUNET_ATS_Network_Type` to a string
422 * @param net the network type
423 * @return a string or NULL if invalid
426 GNUNET_ATS_print_network_type (enum GNUNET_ATS_Network_Type net);
430 * Returns where the address is located: LAN or WAN or ...
432 * @param sh the `struct GNUNET_ATS_SchedulingHandle` handle
433 * @param addr address
434 * @param addrlen address length
435 * @return type of the network the address belongs to
437 enum GNUNET_ATS_Network_Type
438 GNUNET_ATS_address_get_type (struct GNUNET_ATS_SchedulingHandle *sh,
439 const struct sockaddr *addr,
444 * Test if a address and a session is known to ATS.
446 * @param sh the scheduling handle
447 * @param address the address
448 * @param session the session
449 * @return #GNUNET_YES or #GNUNET_NO
452 GNUNET_ATS_session_known (struct GNUNET_ATS_SchedulingHandle *sh,
453 const struct GNUNET_HELLO_Address *address,
454 struct Session *session);
458 * We have a new address ATS should know. Addresses have to be added with this
459 * function before they can be: updated, set in use and destroyed
462 * @param address the address
463 * @param session session handle (if available)
464 * @param ats performance data for the address
465 * @param ats_count number of performance records in @a ats
468 GNUNET_ATS_address_add (struct GNUNET_ATS_SchedulingHandle *sh,
469 const struct GNUNET_HELLO_Address *address,
470 struct Session *session,
471 const struct GNUNET_ATS_Information *ats,
476 * We have updated performance statistics for a given address. Note
477 * that this function can be called for addresses that are currently
478 * in use as well as addresses that are valid but not actively in use.
479 * Furthermore, the peer may not even be connected to us right now (in
480 * which case the call may be ignored or the information may be stored
481 * for later use). Update bandwidth assignments.
484 * @param address updated address
485 * @param session session handle (if available)
486 * @param ats performance data for the address
487 * @param ats_count number of performance records in @a ats
488 * @return #GNUNET_OK or #GNUNET_SYSERR
491 GNUNET_ATS_address_update (struct GNUNET_ATS_SchedulingHandle *sh,
492 const struct GNUNET_HELLO_Address *address,
493 struct Session *session,
494 const struct GNUNET_ATS_Information *ats,
499 * An address is now in use or not used any more.
502 * @param address the address
503 * @param session session handle
504 * @param in_use #GNUNET_YES if this address is now used, #GNUNET_NO
505 * if address is not used any more
508 GNUNET_ATS_address_in_use (struct GNUNET_ATS_SchedulingHandle *sh,
509 const struct GNUNET_HELLO_Address *address,
510 struct Session *session,
515 * An address got destroyed, stop including it as a valid address.
517 * If a session is given, only the session will be removed, if no session is
518 * given the full address will be deleted.
521 * @param address the address
522 * @param session session handle that is no longer valid (if available)
525 GNUNET_ATS_address_destroyed (struct GNUNET_ATS_SchedulingHandle *sh,
526 const struct GNUNET_HELLO_Address *address,
527 struct Session *session);
530 /* ******************************** Performance API ***************************** */
533 * ATS Handle to obtain and/or modify performance information.
535 struct GNUNET_ATS_PerformanceHandle;
538 * Signature of a function that is called with QoS information about an address.
541 * @param address the address, NULL if ATS service was disconnected
542 * @param address_active #GNUNET_YES if this address is actively used
543 * to maintain a connection to a peer;
544 * #GNUNET_NO if the address is not actively used;
545 * #GNUNET_SYSERR if this address is no longer available for ATS
546 * @param bandwidth_out assigned outbound bandwidth for the connection
547 * @param bandwidth_in assigned inbound bandwidth for the connection
548 * @param ats performance data for the address (as far as known)
549 * @param ats_count number of performance records in @a ats
552 (*GNUNET_ATS_AddressInformationCallback) (void *cls,
553 const struct GNUNET_HELLO_Address *address,
555 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
556 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
557 const struct GNUNET_ATS_Information *ats,
562 * Handle for an address listing operation
564 struct GNUNET_ATS_AddressListHandle;
568 * Get handle to access performance API of the ATS subsystem.
570 * @param cfg configuration to use
571 * @param addr_info_cb callback called when performance characteristics for
573 * @param addr_info_cb_cls closure for @a addr_info_cb
574 * @return ats performance context
576 struct GNUNET_ATS_PerformanceHandle *
577 GNUNET_ATS_performance_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
578 GNUNET_ATS_AddressInformationCallback addr_info_cb,
579 void *addr_info_cb_cls);
584 * Get information about addresses known to the ATS subsystem.
586 * @param handle the performance handle to use
587 * @param peer peer idm can be NULL for all peers
588 * @param all GNUNET_YES to get information about all addresses or GNUNET_NO to
589 * get only address currently used
590 * @param infocb callback to call with the addresses,
591 * will callback with address == NULL when done
592 * @param infocb_cls closure for @a infocb
593 * @return ats performance context
595 struct GNUNET_ATS_AddressListHandle *
596 GNUNET_ATS_performance_list_addresses (struct GNUNET_ATS_PerformanceHandle *handle,
597 const struct GNUNET_PeerIdentity *peer,
599 GNUNET_ATS_AddressInformationCallback infocb,
604 * Cancel a pending address listing operation
606 * @param handle the `struct GNUNET_ATS_AddressListHandle` handle to cancel
609 GNUNET_ATS_performance_list_addresses_cancel (struct GNUNET_ATS_AddressListHandle *handle);
613 * Client is done using the ATS performance subsystem, release resources.
618 GNUNET_ATS_performance_done (struct GNUNET_ATS_PerformanceHandle *ph);
622 * Function called with reservation result.
625 * @param peer identifies the peer
626 * @param amount set to the amount that was actually reserved or unreserved;
627 * either the full requested amount or zero (no partial reservations)
628 * @param res_delay if the reservation could not be satisfied (amount was 0), how
629 * long should the client wait until re-trying?
632 (*GNUNET_ATS_ReservationCallback) (void *cls,
633 const struct GNUNET_PeerIdentity * peer,
635 struct GNUNET_TIME_Relative res_delay);
639 * Context that can be used to cancel a peer information request.
641 struct GNUNET_ATS_ReservationContext;
645 * Reserve inbound bandwidth from the given peer. ATS will look at
646 * the current amount of traffic we receive from the peer and ensure
647 * that the peer could add 'amount' of data to its stream.
649 * @param ph performance handle
650 * @param peer identifies the peer
651 * @param amount reserve N bytes for receiving, negative
652 * amounts can be used to undo a (recent) reservation;
653 * @param rcb function to call with the resulting reservation information
654 * @param rcb_cls closure for info
655 * @return NULL on error
656 * @deprecated will be replaced soon
658 struct GNUNET_ATS_ReservationContext *
659 GNUNET_ATS_reserve_bandwidth (struct GNUNET_ATS_PerformanceHandle *ph,
660 const struct GNUNET_PeerIdentity *peer, int32_t amount,
661 GNUNET_ATS_ReservationCallback rcb, void *rcb_cls);
665 * Cancel request for reserving bandwidth.
667 * @param rc context returned by the original GNUNET_ATS_reserve_bandwidth call
670 GNUNET_ATS_reserve_bandwidth_cancel (struct GNUNET_ATS_ReservationContext *rc);
673 * Number of preference types supported by ATS
675 #define GNUNET_ATS_PreferenceCount 3
678 * ATS preference types as array initializer
680 #define GNUNET_ATS_PreferenceType {GNUNET_ATS_PREFERENCE_END, GNUNET_ATS_PREFERENCE_BANDWIDTH, GNUNET_ATS_PREFERENCE_LATENCY}
683 * ATS preference types as string array initializer
685 #define GNUNET_ATS_PreferenceTypeString {"END", "BANDWIDTH", "LATENCY"}
688 * Enum defining all known preference categories.
690 enum GNUNET_ATS_PreferenceKind
694 * End of preference list.
696 GNUNET_ATS_PREFERENCE_END = 0,
699 * Change the peer's bandwidth value (value per byte of bandwidth in
700 * the goal function) to the given amount. The argument is followed
701 * by a double value giving the desired value (can be negative).
702 * Preference changes are forgotten if peers disconnect.
704 GNUNET_ATS_PREFERENCE_BANDWIDTH,
707 * Change the peer's latency value to the given amount. The
708 * argument is followed by a double value giving the desired value
709 * (can be negative). The absolute score in the goal function is
710 * the inverse of the latency in microseconds (minimum: 1
711 * microsecond) multiplied by the latency preferences.
713 GNUNET_ATS_PREFERENCE_LATENCY
717 * Convert a GNUNET_ATS_PreferenceType to a string
719 * @param type the preference type
720 * @return a string or NULL if invalid
723 GNUNET_ATS_print_preference_type (uint32_t type);
727 * Change preferences for the given peer. Preference changes are forgotten if peers
730 * @param ph performance handle
731 * @param peer identifies the peer
732 * @param ... 0-terminated specification of the desired changes
735 GNUNET_ATS_performance_change_preference (struct GNUNET_ATS_PerformanceHandle *ph,
736 const struct GNUNET_PeerIdentity *peer, ...);
740 * Application feedback on how good preference requirements are fulfilled
741 * for the preferences included in the given time scope [now - scope .. now]
743 * An application notifies ATS if (and only if) it has feedback information
744 * for specific properties. This values are valid until the feedback scores are
745 * updated by the application.
747 * If the application has no feedback for this preference kind the application
748 * will not explicitly call for this property and will not include it in this
751 * @param ph performance handle
752 * @param scope the time interval this valid for: [now - scope .. now]
753 * @param peer identifies the peer
754 * @param ... 0-terminated specification of the desired changes
757 GNUNET_ATS_performance_give_feedback (struct GNUNET_ATS_PerformanceHandle *ph,
758 const struct GNUNET_PeerIdentity *peer,
759 const struct GNUNET_TIME_Relative scope, ...);
762 /* end of file gnunet-service-transport_ats.h */