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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"
34 * Enum defining all known property types for ATS Enum values are used
35 * in the GNUNET_ATS_Information struct as
38 * Cost are always stored in uint32_t, so all units used to define costs
39 * have to be normalized to fit in uint32_t [0 .. 4.294.967.295]
41 enum GNUNET_ATS_Property
48 GNUNET_ATS_ARRAY_TERMINATOR = 0,
51 * Actual traffic on this connection from the other peer to this peer.
53 * Unit: [bytes/second]
55 GNUNET_ATS_UTILIZATION_UP,
58 * Actual traffic on this connection from this peer to the other peer.
60 * Unit: [bytes/second]
62 GNUNET_ATS_UTILIZATION_DOWN,
66 * Time between when the time packet is sent and the packet arrives
76 GNUNET_ATS_QUALITY_NET_DELAY,
79 * Distance on network layer (required for distance-vector routing).
83 GNUNET_ATS_QUALITY_NET_DISTANCE,
86 * Network overhead on WAN (Wide-Area Network)
88 * How many bytes are sent on the WAN when 1 kilobyte (1024 bytes)
89 * of application data is transmitted?
90 * A factor used with connect cost, bandwidth cost and energy cost
91 * to describe the overhead produced by the transport protocol
95 * Interpretation: less is better
99 * TCP/IPv4 over Ethernet: 1024 + 38 + 20 + 20 = 1102 [bytes/kb]
100 * TCP/IPv6 over Ethernet: 1024 + 38 + 20 + 40 = 1122 [bytes/kb]
101 * UDP/IPv4 over Ethernet: 1024 + 38 + 20 + 8 = 1090 [bytes/kb]
102 * UDP/IPv6 over Ethernet: 1024 + 38 + 40 + 8 = 1110 [bytes/kb]
107 * Network overhead on LAN (Local-Area Network)
109 * How many bytes are sent on the LAN when 1 kilobyte (1024 bytes)
110 * of application data is transmitted?
111 * A factor used with connect cost, bandwidth cost and energy cost
112 * to describe the overhead produced by the transport protocol
116 * Interpretation: less is better
120 * TCP/IPv4 over Ethernet: 1024 + 38 + 20 + 20 = 1102 [bytes/kb]
121 * TCP/IPv6 over Ethernet: 1024 + 38 + 20 + 40 = 1122 [bytes/kb]
122 * UDP/IPv4 over Ethernet: 1024 + 38 + 20 + 8 = 1090 [bytes/kb]
123 * UDP/IPv6 over Ethernet: 1024 + 38 + 40 + 8 = 1110 [bytes/kb]
128 * Network overhead on WLAN (Wireless Local Area Network)
130 * How many bytes are sent on the LAN when 1 kilobyte (1024 bytes)
131 * of application data is transmitted?
132 * A factor used with connect cost, bandwidth cost and energy cost
133 * to describe the overhead produced by the transport protocol
137 * Interpretation: less is better
141 * TCP/IPv4 over Ethernet: 1024 + 38 + 20 + 20 = 1102 [bytes/kb]
142 * TCP/IPv6 over Ethernet: 1024 + 38 + 20 + 40 = 1122 [bytes/kb]
143 * UDP/IPv4 over Ethernet: 1024 + 38 + 20 + 8 = 1090 [bytes/kb]
144 * UDP/IPv6 over Ethernet: 1024 + 38 + 40 + 8 = 1110 [bytes/kb]
147 /* Cost related values */
148 /* =================== */
150 * Volume based cost in financial units to transmit data
152 * Note: This value is not bound to a specific currency or unit and only
154 * "cent" just refers the smallest amount of money in the respective
159 * Interpretation: less is better
165 // GNUNET_ATS_COST_FINANCIAL_PER_VOLUME = 1,
167 * Time based cost in financial units to transmit data
169 * Note: This value is not bound to a specific currency or unit and only
171 * "cent" just refers the smallest amount of money in the respective
176 * Interpretation: less is better
180 * Dialup: 10 [cent/h]
182 // GNUNET_ATS_COST_FINANCIAL_PER_TIME = 2,
184 * Computational costs
186 * Effort of preparing data to be sent with this transport
187 * Includes encoding, encryption and conversion of data
188 * Partial values can be summed up: c_sum = c_enc + c_enc + c_conv
189 * Resulting values depend on local system properties, e.g. CPU
193 * Interpretation: less is better
197 * HTTPS with AES CBC-256: 7,382
198 * HTTPS with AES CBC-128: 5,279
199 * HTTPS with RC4-1024: 2,652
201 // GNUNET_ATS_COST_COMPUTATIONAL = 3,
205 * Energy consumption using this transport when sending with a certain
206 * power at a certain bitrate. This is only an approximation based on:
207 * Energy consumption E = P / D
210 * Power P in Watt (J/s)
211 * Datarate D in MBit/s
213 * Conversion between power P and dBm used by WLAN in radiotap's dBm TX power:
215 * Lp(dbm) = 10 log10 (P/ 1mW)
217 * => P = 1 mW * 10^(Lp(dbm)/10)
221 * Interpretation: less is better
226 * WLAN: 89 (600 mW @ 802.11g /w 54 MBit/s)
227 * Bluetooth: 267 (100 mW @ BT2.0 EDR /w 3 MBit/s)
229 // GNUNET_ATS_COST_ENERGY_CONSUMPTION = 4,
232 * How many bytes are transmitted to initiate a new connection using
237 * Interpretation: less is better
241 * UDP (No connection) :
243 * TCP (TCP 3-Way handshake):
244 * 220 bytes Ethernet, 172 bytes TCP/IP, 122 bytes TCP
245 * HTTP (TCP + Header) :
246 * 477 bytes Ethernet, 429 bytes TCP/IP, 374 bytes TCP, 278 bytes HTTP
247 * HTTPS HTTP+TLS Handshake:
248 * 2129 bytes Ethernet, 1975 bytes TCP/IP, 1755 bytes TCP, 1403 bytes HTTPS
251 // GNUNET_ATS_COST_CONNECT = 5,
255 * How many bandwidth is available to consume?
256 * Used to calculate which impact sending data with this transport has
260 * Interpretation: more is better
263 * LAN: 12,800 (100 MBit/s)
264 * WLAN: 6,912 (54 MBit/s)
265 * Dial-up: 8 (64 Kbit/s)
268 // GNUNET_ATS_COST_BANDWITH_AVAILABLE = 6,
272 * How many bytes are sent over the wire when 1 kilobyte (1024 bytes)
273 * of application data is transmitted?
274 * A factor used with connect cost, bandwidth cost and energy cost
275 * to describe the overhead produced by the transport protocol
279 * Interpretation: less is better
283 * TCP/IPv4 over Ethernet: 1024 + 38 + 20 + 20 = 1102 [bytes/kb]
284 * TCP/IPv6 over Ethernet: 1024 + 38 + 20 + 40 = 1122 [bytes/kb]
285 * UDP/IPv4 over Ethernet: 1024 + 38 + 20 + 8 = 1090 [bytes/kb]
286 * UDP/IPv6 over Ethernet: 1024 + 38 + 40 + 8 = 1110 [bytes/kb]
288 // GNUNET_ATS_COST_NETWORK_OVERHEAD = 7,
289 /* Quality related values */
290 /* ====================== */
291 /* Physical layer quality properties */
293 * Signal strength on physical layer
297 // GNUNET_ATS_QUALITY_PHY_SIGNAL_STRENGTH = 1025,
299 * Collision rate on physical layer
303 // GNUNET_ATS_QUALITY_PHY_COLLISION_RATE = 1026,
305 * Error rate on physical layer
309 // GNUNET_ATS_QUALITY_PHY_ERROR_RATE = 1027,
312 * Time variations of the delay
313 * 1st derivative of a delay function
317 // GNUNET_ATS_QUALITY_NET_JITTER = 1029,
319 * Error rate on network layer
328 * Note: This numbers are just assumptions as an example, not
329 * measured or somehow determined
331 // GNUNET_ATS_QUALITY_NET_ERRORRATE = 1030,
333 * Drop rate on network layer
334 * Bytes actively dismissed by a network component during transmission
335 * Reasons for dropped data can be full queues, congestion, quota violations...
344 * Note: This numbers are just assumptions as an example, not
345 * measured or somehow determined
347 // GNUNET_ATS_QUALITY_NET_DROPRATE = 1031,
349 * Loss rate on network layer
350 * Bytes lost during transmission
351 * Reasons can be collisions, ...
360 * Note: This numbers are just assumptions as an example, not measured
361 * or somehow determined
363 // GNUNET_ATS_QUALITY_NET_LOSSRATE = 1032,
365 * Throughput on network layer
376 // GNUNET_ATS_QUALITY_NET_THROUGHPUT = 1033,
377 /* Availability related values */
378 /* =========================== */
380 * Is a peer reachable?
382 // GNUNET_ATS_AVAILABILITY_REACHABLE = 2048,
384 * Is there a connection established to a peer using this transport
386 // GNUNET_ATS_AVAILABILITY_CONNECTED = 2049
391 * struct used to communicate the transport's properties like cost and
392 * quality of service as well as high-level constraints on resource
396 * +-----------+ Constraints | | Plugin properties +---------+
397 * | Highlevel |------------> |ATS| <------------------|Transport|
398 * | Component | ATS struct | | ATS struct | Plugin |
399 * +-----------+ | | +---------+
402 * This structure will be used by transport plugins to communicate
403 * costs to ATS or by higher level components to tell ATS their
404 * constraints. Always a pair of (GNUNET_ATS_Property,
405 * uint32_t value). Value is always uint32_t, so all units used to
406 * define costs have to be normalized to fit uint32_t.
408 struct GNUNET_ATS_Information
411 * ATS property type, in network byte order.
413 uint32_t type GNUNET_PACKED;
416 * ATS property value, in network byte order.
418 uint32_t value GNUNET_PACKED;
423 /* ******************************** Scheduling API ***************************** */
426 * Handle to the ATS subsystem for bandwidth/transport scheduling information.
428 struct GNUNET_ATS_SchedulingHandle;
432 * Opaque session handle, defined by plugins. Contents not known to ATS.
438 * Signature of a function called by ATS with the current bandwidth
439 * and address preferences as determined by ATS.
442 * @param peer identity of the new peer
443 * @param plugin_name name of the plugin, NULL if we have no suggestion
444 * @param plugin_addr suggested address, NULL if we have no suggestion
445 * @param plugin_addr_len number of bytes in plugin_addr
446 * @param session session to use
447 * @param bandwidth_out assigned outbound bandwidth for the connection
448 * @param bandwidth_in assigned inbound bandwidth for the connection
449 * @param ats performance data for the address (as far as known)
450 * @param ats_count number of performance records in 'ats'
452 typedef void (*GNUNET_ATS_AddressSuggestionCallback) (void *cls,
454 GNUNET_PeerIdentity *
456 const char *plugin_name,
457 const void *plugin_addr,
458 size_t plugin_addr_len,
459 struct Session * session,
461 GNUNET_BANDWIDTH_Value32NBO
464 GNUNET_BANDWIDTH_Value32NBO
467 GNUNET_ATS_Information *
468 ats, uint32_t ats_count);
472 * Initialize the ATS subsystem.
474 * @param cfg configuration to use
475 * @param suggest_cb notification to call whenever the suggestation changed
476 * @param suggest_cb_cls closure for 'suggest_cb'
477 * @return ats context
479 struct GNUNET_ATS_SchedulingHandle *
480 GNUNET_ATS_scheduling_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
481 GNUNET_ATS_AddressSuggestionCallback suggest_cb,
482 void *suggest_cb_cls);
486 * Client is done with ATS scheduling, release resources.
488 * @param sh handle to release
491 GNUNET_ATS_scheduling_done (struct GNUNET_ATS_SchedulingHandle *sh);
495 * We would like to establish a new connection with a peer. ATS
496 * should suggest a good address to begin with.
499 * @param peer identity of the peer we need an address for
502 GNUNET_ATS_suggest_address (struct GNUNET_ATS_SchedulingHandle *sh,
503 const struct GNUNET_PeerIdentity *peer);
507 * We have updated performance statistics for a given address. Note
508 * that this function can be called for addresses that are currently
509 * in use as well as addresses that are valid but not actively in use.
510 * Furthermore, the peer may not even be connected to us right now (in
511 * which case the call may be ignored or the information may be stored
512 * for later use). Update bandwidth assignments.
515 * @param peer identity of the new peer
516 * @param plugin_name name of the transport plugin
517 * @param plugin_addr address (if available)
518 * @param plugin_addr_len number of bytes in plugin_addr
519 * @param session session handle (if available)
520 * @param ats performance data for the address
521 * @param ats_count number of performance records in 'ats'
524 GNUNET_ATS_address_update (struct GNUNET_ATS_SchedulingHandle *sh,
525 const struct GNUNET_PeerIdentity *peer,
526 const char *plugin_name, const void *plugin_addr,
527 size_t plugin_addr_len, struct Session *session,
528 const struct GNUNET_ATS_Information *ats,
533 * An address is now in use or not used any more.
536 * @param peer identity of the peer
537 * @param plugin_name name of the transport plugin
538 * @param plugin_addr address (if available)
539 * @param plugin_addr_len number of bytes in plugin_addr
540 * @param session session handle
541 * @param in_use GNUNET_YES if this address is now used, GNUNET_NO
542 * if address is not used any more
545 GNUNET_ATS_address_in_use (struct GNUNET_ATS_SchedulingHandle *sh,
546 const struct GNUNET_PeerIdentity *peer,
547 const char *plugin_name, const void *plugin_addr,
548 size_t plugin_addr_len, struct Session *session,
552 * A session got destroyed, stop including it as a valid address.
555 * @param peer identity of the peer
556 * @param plugin_name name of the transport plugin
557 * @param plugin_addr address (if available)
558 * @param plugin_addr_len number of bytes in plugin_addr
559 * @param session session handle that is no longer valid (if available)
562 GNUNET_ATS_address_destroyed (struct GNUNET_ATS_SchedulingHandle *sh,
563 const struct GNUNET_PeerIdentity *peer,
564 const char *plugin_name, const void *plugin_addr,
565 size_t plugin_addr_len, struct Session *session);
568 /* ******************************** Performance API ***************************** */
571 * ATS Handle to obtain and/or modify performance information.
573 struct GNUNET_ATS_PerformanceHandle;
577 * Signature of a function that is called with QoS information about a peer.
580 * @param peer identity of the new peer
581 * @param plugin_name name of the plugin, NULL if we have no suggestion
582 * @param plugin_addr suggested address, NULL if we have no suggestion
583 * @param plugin_addr_len number of bytes in plugin_addr
584 * @param bandwidth_out assigned outbound bandwidth for the connection
585 * @param bandwidth_in assigned inbound bandwidth for the connection
586 * @param ats performance data for the address (as far as known)
587 * @param ats_count number of performance records in 'ats'
589 typedef void (*GNUNET_ATS_PeerInformationCallback) (void *cls,
591 GNUNET_PeerIdentity * peer,
592 const char *plugin_name,
593 const void *plugin_addr,
594 size_t plugin_addr_len,
596 GNUNET_BANDWIDTH_Value32NBO
599 GNUNET_BANDWIDTH_Value32NBO
602 GNUNET_ATS_Information *
603 ats, uint32_t ats_count);
607 * Get handle to access performance API of the ATS subsystem.
609 * @param cfg configuration to use
610 * @param infocb function to call on performance changes, can be NULL
611 * @param infocb_cls closure for infocb
612 * @return ats performance context
614 struct GNUNET_ATS_PerformanceHandle *
615 GNUNET_ATS_performance_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
616 GNUNET_ATS_PeerInformationCallback infocb,
621 * Client is done using the ATS performance subsystem, release resources.
626 GNUNET_ATS_performance_done (struct GNUNET_ATS_PerformanceHandle *ph);
630 * Function called with reservation result.
633 * @param peer identifies the peer
634 * @param amount set to the amount that was actually reserved or unreserved;
635 * either the full requested amount or zero (no partial reservations)
636 * @param res_delay if the reservation could not be satisfied (amount was 0), how
637 * long should the client wait until re-trying?
639 typedef void (*GNUNET_ATS_ReservationCallback) (void *cls,
640 const struct GNUNET_PeerIdentity
641 * peer, int32_t amount,
642 struct GNUNET_TIME_Relative
648 * Context that can be used to cancel a peer information request.
650 struct GNUNET_ATS_ReservationContext;
654 * Reserve inbound bandwidth from the given peer. ATS will look at
655 * the current amount of traffic we receive from the peer and ensure
656 * that the peer could add 'amount' of data to its stream.
658 * @param ph performance handle
659 * @param peer identifies the peer
660 * @param amount reserve N bytes for receiving, negative
661 * amounts can be used to undo a (recent) reservation;
662 * @param rcb function to call with the resulting reservation information
663 * @param rcb_cls closure for info
664 * @return NULL on error
665 * @deprecated will be replaced soon
667 struct GNUNET_ATS_ReservationContext *
668 GNUNET_ATS_reserve_bandwidth (struct GNUNET_ATS_PerformanceHandle *ph,
669 const struct GNUNET_PeerIdentity *peer,
671 GNUNET_ATS_ReservationCallback rcb,
676 * Cancel request for reserving bandwidth.
678 * @param rc context returned by the original GNUNET_ATS_reserve_bandwidth call
681 GNUNET_ATS_reserve_bandwidth_cancel (struct GNUNET_ATS_ReservationContext *rc);
686 * Enum defining all known preference categories.
688 enum GNUNET_ATS_PreferenceKind
692 * End of preference list.
694 GNUNET_ATS_PREFERENCE_END = 0,
697 * Change the peer's bandwidth value (value per byte of bandwidth in
698 * the goal function) to the given amount. The argument is followed
699 * by a double value giving the desired value (can be negative).
700 * Preference changes are forgotten if peers disconnect.
702 GNUNET_ATS_PREFERENCE_BANDWIDTH,
705 * Change the peer's latency value to the given amount. The
706 * argument is followed by a double value giving the desired value
707 * (can be negative). The absolute score in the goal function is
708 * the inverse of the latency in ms (minimum: 1 ms) multiplied by
709 * the latency preferences.
711 GNUNET_ATS_PREFERENCE_LATENCY
716 * Change preferences for the given peer. Preference changes are forgotten if peers
719 * @param ph performance handle
720 * @param peer identifies the peer
721 * @param ... 0-terminated specification of the desired changes
724 GNUNET_ATS_change_preference (struct GNUNET_ATS_PerformanceHandle *ph,
725 const struct GNUNET_PeerIdentity *peer, ...);
730 /* end of file gnunet-service-transport_ats.h */