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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]
150 /* Cost related values */
151 /* =================== */
154 * Volume based cost in financial units to transmit data
156 * Note: This value is not bound to a specific currency or unit and only
158 * "cent" just refers the smallest amount of money in the respective
163 * Interpretation: less is better
169 // GNUNET_ATS_COST_FINANCIAL_PER_VOLUME = 1,
172 * Time based cost in financial units to transmit data
174 * Note: This value is not bound to a specific currency or unit and only
176 * "cent" just refers the smallest amount of money in the respective
181 * Interpretation: less is better
185 * Dialup: 10 [cent/h]
187 // GNUNET_ATS_COST_FINANCIAL_PER_TIME = 2,
190 * Computational costs
192 * Effort of preparing data to be sent with this transport
193 * Includes encoding, encryption and conversion of data
194 * Partial values can be summed up: c_sum = c_enc + c_enc + c_conv
195 * Resulting values depend on local system properties, e.g. CPU
199 * Interpretation: less is better
203 * HTTPS with AES CBC-256: 7,382
204 * HTTPS with AES CBC-128: 5,279
205 * HTTPS with RC4-1024: 2,652
207 // GNUNET_ATS_COST_COMPUTATIONAL = 3,
212 * Energy consumption using this transport when sending with a certain
213 * power at a certain bitrate. This is only an approximation based on:
214 * Energy consumption E = P / D
217 * Power P in Watt (J/s)
218 * Datarate D in MBit/s
220 * Conversion between power P and dBm used by WLAN in radiotap's dBm TX power:
222 * Lp(dbm) = 10 log10 (P/ 1mW)
224 * => P = 1 mW * 10^(Lp(dbm)/10)
228 * Interpretation: less is better
233 * WLAN: 89 (600 mW @ 802.11g /w 54 MBit/s)
234 * Bluetooth: 267 (100 mW @ BT2.0 EDR /w 3 MBit/s)
236 // GNUNET_ATS_COST_ENERGY_CONSUMPTION = 4,
240 * How many bytes are transmitted to initiate a new connection using
245 * Interpretation: less is better
249 * UDP (No connection) :
251 * TCP (TCP 3-Way handshake):
252 * 220 bytes Ethernet, 172 bytes TCP/IP, 122 bytes TCP
253 * HTTP (TCP + Header) :
254 * 477 bytes Ethernet, 429 bytes TCP/IP, 374 bytes TCP, 278 bytes HTTP
255 * HTTPS HTTP+TLS Handshake:
256 * 2129 bytes Ethernet, 1975 bytes TCP/IP, 1755 bytes TCP, 1403 bytes HTTPS
259 // GNUNET_ATS_COST_CONNECT = 5,
264 * How many bandwidth is available to consume?
265 * Used to calculate which impact sending data with this transport has
269 * Interpretation: more is better
272 * LAN: 12,800 (100 MBit/s)
273 * WLAN: 6,912 (54 MBit/s)
274 * Dial-up: 8 (64 Kbit/s)
277 // GNUNET_ATS_COST_BANDWITH_AVAILABLE = 6,
282 * How many bytes are sent over the wire when 1 kilobyte (1024 bytes)
283 * of application data is transmitted?
284 * A factor used with connect cost, bandwidth cost and energy cost
285 * to describe the overhead produced by the transport protocol
289 * Interpretation: less is better
293 * TCP/IPv4 over Ethernet: 1024 + 38 + 20 + 20 = 1102 [bytes/kb]
294 * TCP/IPv6 over Ethernet: 1024 + 38 + 20 + 40 = 1122 [bytes/kb]
295 * UDP/IPv4 over Ethernet: 1024 + 38 + 20 + 8 = 1090 [bytes/kb]
296 * UDP/IPv6 over Ethernet: 1024 + 38 + 40 + 8 = 1110 [bytes/kb]
298 // GNUNET_ATS_COST_NETWORK_OVERHEAD = 7,
301 /* Quality related values */
302 /* ====================== */
304 /* Physical layer quality properties */
307 * Signal strength on physical layer
311 // GNUNET_ATS_QUALITY_PHY_SIGNAL_STRENGTH = 1025,
314 * Collision rate on physical layer
318 // GNUNET_ATS_QUALITY_PHY_COLLISION_RATE = 1026,
321 * Error rate on physical layer
325 // GNUNET_ATS_QUALITY_PHY_ERROR_RATE = 1027,
329 * Time variations of the delay
330 * 1st derivative of a delay function
334 // GNUNET_ATS_QUALITY_NET_JITTER = 1029,
337 * Error rate on network layer
346 * Note: This numbers are just assumptions as an example, not
347 * measured or somehow determined
349 // GNUNET_ATS_QUALITY_NET_ERRORRATE = 1030,
352 * Drop rate on network layer
353 * Bytes actively dismissed by a network component during transmission
354 * Reasons for dropped data can be full queues, congestion, quota violations...
363 * Note: This numbers are just assumptions as an example, not
364 * measured or somehow determined
366 // GNUNET_ATS_QUALITY_NET_DROPRATE = 1031,
369 * Loss rate on network layer
370 * Bytes lost during transmission
371 * Reasons can be collisions, ...
380 * Note: This numbers are just assumptions as an example, not measured
381 * or somehow determined
383 // GNUNET_ATS_QUALITY_NET_LOSSRATE = 1032,
386 * Throughput on network layer
397 // GNUNET_ATS_QUALITY_NET_THROUGHPUT = 1033,
400 /* Availability related values */
401 /* =========================== */
404 * Is a peer reachable?
406 // GNUNET_ATS_AVAILABILITY_REACHABLE = 2048,
409 * Is there a connection established to a peer using this transport
411 // GNUNET_ATS_AVAILABILITY_CONNECTED = 2049
416 * struct used to communicate the transport's properties like cost and
417 * quality of service as well as high-level constraints on resource
421 * +-----------+ Constraints | | Plugin properties +---------+
422 * | Highlevel |------------> |ATS| <------------------|Transport|
423 * | Component | ATS struct | | ATS struct | Plugin |
424 * +-----------+ | | +---------+
427 * This structure will be used by transport plugins to communicate
428 * costs to ATS or by higher level components to tell ATS their
429 * constraints. Always a pair of (GNUNET_ATS_Property,
430 * uint32_t value). Value is always uint32_t, so all units used to
431 * define costs have to be normalized to fit uint32_t.
433 struct GNUNET_ATS_Information
436 * ATS property type, in network byte order.
441 * ATS property value, in network byte order.
448 /* ******************************** Scheduling API ***************************** */
451 * Handle to the ATS subsystem for bandwidth/transport scheduling information.
453 struct GNUNET_ATS_SchedulingHandle;
457 * Opaque session handle, defined by plugins. Contents not known to ATS.
463 * Signature of a function called by ATS with the current bandwidth
464 * and address preferences as determined by ATS.
467 * @param peer identity of the new peer
468 * @param plugin_name name of the plugin, NULL if we have no suggestion
469 * @param plugin_addr suggested address, NULL if we have no suggestion
470 * @param plugin_addr_len number of bytes in plugin_addr
471 * @param session session to use
472 * @param bandwidth_out assigned outbound bandwidth for the connection
473 * @param bandwidth_in assigned inbound bandwidth for the connection
474 * @param ats performance data for the address (as far as known)
475 * @param ats_count number of performance records in 'ats'
477 typedef void (*GNUNET_ATS_AddressSuggestionCallback) (void *cls,
479 GNUNET_PeerIdentity *
481 const char *plugin_name,
482 const void *plugin_addr,
483 size_t plugin_addr_len,
484 struct Session * session,
486 GNUNET_BANDWIDTH_Value32NBO
489 GNUNET_BANDWIDTH_Value32NBO
492 GNUNET_ATS_Information
498 * Initialize the ATS subsystem.
500 * @param cfg configuration to use
501 * @param suggest_cb notification to call whenever the suggestation changed
502 * @param suggest_cb_cls closure for 'suggest_cb'
503 * @return ats context
505 struct GNUNET_ATS_SchedulingHandle *
506 GNUNET_ATS_scheduling_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
507 GNUNET_ATS_AddressSuggestionCallback suggest_cb,
508 void *suggest_cb_cls);
512 * Client is done with ATS scheduling, release resources.
514 * @param sh handle to release
517 GNUNET_ATS_scheduling_done (struct GNUNET_ATS_SchedulingHandle *sh);
521 * We would like to establish a new connection with a peer. ATS
522 * should suggest a good address to begin with.
525 * @param peer identity of the peer we need an address for
528 GNUNET_ATS_suggest_address (struct GNUNET_ATS_SchedulingHandle *sh,
529 const struct GNUNET_PeerIdentity *peer);
533 * We have updated performance statistics for a given address. Note
534 * that this function can be called for addresses that are currently
535 * in use as well as addresses that are valid but not actively in use.
536 * Furthermore, the peer may not even be connected to us right now (in
537 * which case the call may be ignored or the information may be stored
538 * for later use). Update bandwidth assignments.
541 * @param peer identity of the new peer
542 * @param plugin_name name of the transport plugin
543 * @param plugin_addr address (if available)
544 * @param plugin_addr_len number of bytes in plugin_addr
545 * @param session session handle (if available)
546 * @param ats performance data for the address
547 * @param ats_count number of performance records in 'ats'
550 GNUNET_ATS_address_update (struct GNUNET_ATS_SchedulingHandle *sh,
551 const struct GNUNET_PeerIdentity *peer,
552 const char *plugin_name,
553 const void *plugin_addr, size_t plugin_addr_len,
554 struct Session *session,
555 const struct GNUNET_ATS_Information *ats,
560 * A session got destroyed, stop including it as a valid address.
563 * @param peer identity of the peer
564 * @param plugin_name name of the transport plugin
565 * @param plugin_addr address (if available)
566 * @param plugin_addr_len number of bytes in plugin_addr
567 * @param session session handle that is no longer valid (if available)
570 GNUNET_ATS_address_destroyed (struct GNUNET_ATS_SchedulingHandle *sh,
571 const struct GNUNET_PeerIdentity *peer,
572 const char *plugin_name,
573 const void *plugin_addr,
574 size_t plugin_addr_len,
575 struct Session *session);
578 /* ******************************** Performance API ***************************** */
581 * ATS Handle to obtain and/or modify performance information.
583 struct GNUNET_ATS_PerformanceHandle;
587 * Signature of a function that is called with QoS information about a peer.
590 * @param peer identity of the new peer
591 * @param plugin_name name of the plugin, NULL if we have no suggestion
592 * @param plugin_addr suggested address, NULL if we have no suggestion
593 * @param plugin_addr_len number of bytes in plugin_addr
594 * @param bandwidth_out assigned outbound bandwidth for the connection
595 * @param bandwidth_in assigned inbound bandwidth for the connection
596 * @param ats performance data for the address (as far as known)
597 * @param ats_count number of performance records in 'ats'
599 typedef void (*GNUNET_ATS_PeerInformationCallback) (void *cls,
601 GNUNET_PeerIdentity *
603 const char *plugin_name,
604 const void *plugin_addr,
605 size_t plugin_addr_len,
607 GNUNET_BANDWIDTH_Value32NBO
610 GNUNET_BANDWIDTH_Value32NBO
613 GNUNET_ATS_Information
619 * Get handle to access performance API of the ATS subsystem.
621 * @param cfg configuration to use
622 * @param infocb function to call on performance changes, can be NULL
623 * @param infocb_cls closure for infocb
624 * @return ats performance context
626 struct GNUNET_ATS_PerformanceHandle *
627 GNUNET_ATS_performance_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
628 GNUNET_ATS_PeerInformationCallback infocb,
633 * Client is done using the ATS performance subsystem, release resources.
638 GNUNET_ATS_performance_done (struct GNUNET_ATS_PerformanceHandle *ph);
642 * Function called with reservation result.
645 * @param peer identifies the peer
646 * @param amount set to the amount that was actually reserved or unreserved;
647 * either the full requested amount or zero (no partial reservations)
648 * @param res_delay if the reservation could not be satisfied (amount was 0), how
649 * long should the client wait until re-trying?
651 typedef void (*GNUNET_ATS_ReservationCallback) (void *cls,
653 GNUNET_PeerIdentity *
663 * Context that can be used to cancel a peer information request.
665 struct GNUNET_ATS_ReservationContext;
669 * Reserve inbound bandwidth from the given peer. ATS will look at
670 * the current amount of traffic we receive from the peer and ensure
671 * that the peer could add 'amount' of data to its stream.
673 * @param ph performance handle
674 * @param peer identifies the peer
675 * @param amount reserve N bytes for receiving, negative
676 * amounts can be used to undo a (recent) reservation;
677 * @param rcb function to call with the resulting reservation information
678 * @param rcb_cls closure for info
679 * @return NULL on error
680 * @deprecated will be replaced soon
682 struct GNUNET_ATS_ReservationContext *
683 GNUNET_ATS_reserve_bandwidth (struct GNUNET_ATS_PerformanceHandle *ph,
684 const struct GNUNET_PeerIdentity *peer,
686 GNUNET_ATS_ReservationCallback rcb,
691 * Cancel request for reserving bandwidth.
693 * @param rc context returned by the original GNUNET_ATS_reserve_bandwidth call
696 GNUNET_ATS_reserve_bandwidth_cancel (struct
697 GNUNET_ATS_ReservationContext *rc);
702 * Enum defining all known preference categories.
704 enum GNUNET_ATS_PreferenceKind
708 * End of preference list.
710 GNUNET_ATS_PREFERENCE_END = 0,
713 * Change the peer's bandwidth value (value per byte of bandwidth in
714 * the goal function) to the given amount. The argument is followed
715 * by a double value giving the desired value (can be negative).
716 * Preference changes are forgotten if peers disconnect.
718 GNUNET_ATS_PREFERENCE_BANDWIDTH,
721 * Change the peer's latency value to the given amount. The
722 * argument is followed by a double value giving the desired value
723 * (can be negative). The absolute score in the goal function is
724 * the inverse of the latency in ms (minimum: 1 ms) multiplied by
725 * the latency preferences.
727 GNUNET_ATS_PREFERENCE_LATENCY
733 * Change preferences for the given peer. Preference changes are forgotten if peers
736 * @param ph performance handle
737 * @param peer identifies the peer
738 * @param ... 0-terminated specification of the desired changes
741 GNUNET_ATS_change_preference (struct GNUNET_ATS_PerformanceHandle *ph,
742 const struct GNUNET_PeerIdentity *peer,
748 /* end of file gnunet-service-transport_ats.h */