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1/*
2 This file is part of GNUnet.
3 Copyright (C) 2010-2015 GNUnet e.V.
4
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
14
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17
18 SPDX-License-Identifier: AGPL3.0-or-later
19 */
20/**
21 * @addtogroup Backbone
22 * @{
23 *
24 * @file
25 * Automatic transport selection and outbound bandwidth determination
26 *
27 * @author Christian Grothoff
28 * @author Matthias Wachs
29 *
30 * @defgroup ats ATS service
31 * Automatic Transport Selection and outbound bandwidth determination
32 *
33 * @see [Documentation](https://gnunet.org/ats-subsystem)
34 *
35 * @{
36 */
37#ifndef GNUNET_ATS_SERVICE_H
38#define GNUNET_ATS_SERVICE_H
39
40
41#include "gnunet_constants.h"
42#include "gnunet_util_lib.h"
43#include "gnunet_hello_lib.h"
44
45
46/**
47 * Default bandwidth assigned to a network : 64 KB/s
48 */
49#define GNUNET_ATS_DefaultBandwidth 65536
50
51/**
52 * Undefined value for an `enum GNUNET_ATS_Property`
53 */
54#define GNUNET_ATS_VALUE_UNDEFINED UINT32_MAX
55
56/**
57 * String representation for GNUNET_ATS_VALUE_UNDEFINED
58 */
59#define GNUNET_ATS_VALUE_UNDEFINED_STR "undefined"
60
61/**
62 * Maximum bandwidth assigned to a network : 4095 MB/s
63 */
64#define GNUNET_ATS_MaxBandwidth UINT32_MAX
65
66/**
67 * Textual equivalent for GNUNET_ATS_MaxBandwidth
68 */
69#define GNUNET_ATS_MaxBandwidthString "unlimited"
70
71
72/**
73 * ATS performance characteristics for an address.
74 */
75struct GNUNET_ATS_Properties
76{
77 /**
78 * Delay. Time between when the time packet is sent and the packet
79 * arrives. FOREVER if we did not measure yet.
80 */
81 struct GNUNET_TIME_Relative delay;
82
83 /**
84 * Actual traffic on this connection from this peer to the other peer.
85 * Includes transport overhead.
86 *
87 * Unit: [bytes/second]
88 */
89 uint32_t utilization_out;
90
91 /**
92 * Actual traffic on this connection from the other peer to this peer.
93 * Includes transport overhead.
94 *
95 * Unit: [bytes/second]
96 */
97 uint32_t utilization_in;
98
99 /**
100 * Distance on network layer (required for distance-vector routing)
101 * in hops. Zero for direct connections (e.g. plain TCP/UDP).
102 */
103 unsigned int distance;
104
105 /**
106 * Which network scope does the respective address belong to?
107 * This property does not change.
108 */
109 enum GNUNET_NetworkType scope;
110};
111
112
113/**
114 * ATS performance characteristics for an address in
115 * network byte order (for IPC).
116 */
117struct GNUNET_ATS_PropertiesNBO
118{
119 /**
120 * Actual traffic on this connection from this peer to the other peer.
121 * Includes transport overhead.
122 *
123 * Unit: [bytes/second]
124 */
125 uint32_t utilization_out GNUNET_PACKED;
126
127 /**
128 * Actual traffic on this connection from the other peer to this peer.
129 * Includes transport overhead.
130 *
131 * Unit: [bytes/second]
132 */
133 uint32_t utilization_in GNUNET_PACKED;
134
135 /**
136 * Which network scope does the respective address belong to?
137 * This property does not change.
138 */
139 uint32_t scope GNUNET_PACKED;
140
141 /**
142 * Distance on network layer (required for distance-vector routing)
143 * in hops. Zero for direct connections (e.g. plain TCP/UDP).
144 */
145 uint32_t distance GNUNET_PACKED;
146
147 /**
148 * Delay. Time between when the time packet is sent and the packet
149 * arrives. FOREVER if we did not measure yet.
150 */
151 struct GNUNET_TIME_RelativeNBO delay;
152};
153
154
155/* ********************* LAN Characterization library ************************ */
156/* Note: these functions do not really communicate with the ATS service */
157
158
159/**
160 * Convert ATS properties from host to network byte order.
161 *
162 * @param nbo[out] value written
163 * @param hbo value read
164 */
165void
166GNUNET_ATS_properties_hton (struct GNUNET_ATS_PropertiesNBO *nbo,
167 const struct GNUNET_ATS_Properties *hbo);
168
169
170/**
171 * Convert ATS properties from network to host byte order.
172 *
173 * @param hbo[out] value written
174 * @param nbo value read
175 */
176void
177GNUNET_ATS_properties_ntoh (struct GNUNET_ATS_Properties *hbo,
178 const struct GNUNET_ATS_PropertiesNBO *nbo);
179
180
181/* ********************Connection Suggestion API ***************************** */
182
183/**
184 * Handle to the ATS subsystem for making suggestions about
185 * connections the peer would like to have.
186 */
187struct GNUNET_ATS_ConnectivityHandle;
188
189/**
190 * Handle for address suggestion requests.
191 */
192struct GNUNET_ATS_ConnectivitySuggestHandle;
193
194
195/**
196 * Initialize the ATS connectivity suggestion client handle.
197 *
198 * @param cfg configuration to use
199 * @return ats connectivity handle, NULL on error
200 */
201struct GNUNET_ATS_ConnectivityHandle *
202GNUNET_ATS_connectivity_init (const struct GNUNET_CONFIGURATION_Handle *cfg);
203
204
205/**
206 * Shutdown ATS connectivity suggestion client.
207 *
208 * @param ch handle to destroy
209 */
210void
211GNUNET_ATS_connectivity_done (struct GNUNET_ATS_ConnectivityHandle *ch);
212
213
214/**
215 * We would like to establish a new connection with a peer. ATS
216 * should suggest a good address to begin with.
217 *
218 * @param ch handle
219 * @param peer identity of the peer we need an address for
220 * @param strength how urgent is the need for such a suggestion
221 * @return suggestion handle, NULL if request is already pending
222 */
223struct GNUNET_ATS_ConnectivitySuggestHandle *
224GNUNET_ATS_connectivity_suggest (struct GNUNET_ATS_ConnectivityHandle *ch,
225 const struct GNUNET_PeerIdentity *peer,
226 uint32_t strength);
227
228
229/**
230 * We no longer care about being connected to a peer.
231 *
232 * @param sh handle to stop
233 */
234void
235GNUNET_ATS_connectivity_suggest_cancel (struct
236 GNUNET_ATS_ConnectivitySuggestHandle *sh);
237
238
239/* ******************************** Scheduling API ***************************** */
240
241/**
242 * Handle to the ATS subsystem for bandwidth/transport scheduling information.
243 */
244struct GNUNET_ATS_SchedulingHandle;
245
246/**
247 * Opaque session handle, defined by plugins. Contents not known to ATS.
248 */
249struct GNUNET_ATS_Session;
250
251
252/**
253 * Signature of a function called by ATS with the current bandwidth
254 * and address preferences as determined by ATS. If our connection
255 * to ATS dies and thus all suggestions become invalid, this function
256 * is called ONCE with all arguments (except @a cls) being NULL/0.
257 *
258 * @param cls closure
259 * @param peer for which we suggest an address, NULL if ATS connection died
260 * @param address suggested address (including peer identity of the peer),
261 * may be NULL to signal disconnect from peer
262 * @param session session to use, NULL to establish a new outgoing session
263 * @param bandwidth_out assigned outbound bandwidth for the connection,
264 * 0 to signal disconnect
265 * @param bandwidth_in assigned inbound bandwidth for the connection,
266 * 0 to signal disconnect
267 */
268typedef void
269(*GNUNET_ATS_AddressSuggestionCallback) (void *cls,
270 const struct GNUNET_PeerIdentity *peer,
271 const struct
272 GNUNET_HELLO_Address *address,
273 struct GNUNET_ATS_Session *session,
274 struct GNUNET_BANDWIDTH_Value32NBO
275 bandwidth_out,
276 struct GNUNET_BANDWIDTH_Value32NBO
277 bandwidth_in);
278
279
280/**
281 * Initialize the ATS scheduling subsystem.
282 *
283 * @param cfg configuration to use
284 * @param suggest_cb notification to call whenever the suggestation changed
285 * @param suggest_cb_cls closure for @a suggest_cb
286 * @return ats context
287 */
288struct GNUNET_ATS_SchedulingHandle *
289GNUNET_ATS_scheduling_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
290 GNUNET_ATS_AddressSuggestionCallback suggest_cb,
291 void *suggest_cb_cls);
292
293
294/**
295 * Client is done with ATS scheduling, release resources.
296 *
297 * @param sh handle to release
298 */
299void
300GNUNET_ATS_scheduling_done (struct GNUNET_ATS_SchedulingHandle *sh);
301
302
303/**
304 * Handle used within ATS to track an address.
305 */
306struct GNUNET_ATS_AddressRecord;
307
308
309/**
310 * We have a new address ATS should know. Addresses have to be added with this
311 * function before they can be: updated, set in use and destroyed
312 *
313 * @param sh handle
314 * @param address the address
315 * @param session session handle (if available, e.g for incoming connections)
316 * @param prop performance data for the address
317 * @return handle to the address representation inside ATS, NULL
318 * on error (i.e. ATS knows this exact address already, or
319 * address is invalid)
320 */
321struct GNUNET_ATS_AddressRecord *
322GNUNET_ATS_address_add (struct GNUNET_ATS_SchedulingHandle *sh,
323 const struct GNUNET_HELLO_Address *address,
324 struct GNUNET_ATS_Session *session,
325 const struct GNUNET_ATS_Properties *prop);
326
327
328/**
329 * An address was used to initiate a session.
330 *
331 * @param ar address record to update information for
332 * @param session session handle
333 */
334void
335GNUNET_ATS_address_add_session (struct GNUNET_ATS_AddressRecord *ar,
336 struct GNUNET_ATS_Session *session);
337
338
339/**
340 * A @a session was destroyed, disassociate it from the given address
341 * record. If this was an incoming address, destroys the address as
342 * well.
343 *
344 * @param ar address record to update information for
345 * @param session session handle
346 * @return #GNUNET_YES if the @a ar was destroyed because
347 * it was an incoming address,
348 * #GNUNET_NO if the @a ar was kept because we can
349 * use it still to establish a new session
350 */
351int
352GNUNET_ATS_address_del_session (struct GNUNET_ATS_AddressRecord *ar,
353 struct GNUNET_ATS_Session *session);
354
355
356/**
357 * We have updated performance statistics for a given address. Note
358 * that this function can be called for addresses that are currently
359 * in use as well as addresses that are valid but not actively in use.
360 * Furthermore, the peer may not even be connected to us right now (@a
361 * session value of NULL used to signal disconnect, or somehow we
362 * otherwise got updated on @a ats information). Based on the
363 * information provided, ATS may update bandwidth assignments and
364 * suggest to switch addresses.
365 *
366 * @param ar address record to update information for
367 * @param prop performance data for the address
368 */
369void
370GNUNET_ATS_address_update (struct GNUNET_ATS_AddressRecord *ar,
371 const struct GNUNET_ATS_Properties *prop);
372
373
374/**
375 * An address got destroyed, stop using it as a valid address.
376 *
377 * @param ar address record to destroy, its validation has
378 * expired and ATS may no longer use it
379 */
380void
381GNUNET_ATS_address_destroy (struct GNUNET_ATS_AddressRecord *ar);
382
383
384/* ******************************** Performance API ***************************** */
385
386/**
387 * ATS Handle to obtain and/or modify performance information.
388 */
389struct GNUNET_ATS_PerformanceHandle;
390
391/**
392 * Signature of a function that is called with QoS information about an address.
393 *
394 * @param cls closure
395 * @param address the address, NULL if ATS service was disconnected or
396 * when the iteration is completed in the case of
397 * #GNUNET_ATS_performance_list_addresses()
398 * @param address_active #GNUNET_YES if this address is actively used
399 * to maintain a connection to a peer;
400 * #GNUNET_NO if the address is not actively used;
401 * #GNUNET_SYSERR if this address is no longer available for ATS
402 * @param bandwidth_out assigned outbound bandwidth for the connection
403 * @param bandwidth_in assigned inbound bandwidth for the connection
404 * @param prop performance data for the address
405 */
406typedef void
407(*GNUNET_ATS_AddressInformationCallback) (void *cls,
408 const struct
409 GNUNET_HELLO_Address *address,
410 int address_active,
411 struct GNUNET_BANDWIDTH_Value32NBO
412 bandwidth_out,
413 struct GNUNET_BANDWIDTH_Value32NBO
414 bandwidth_in,
415 const struct
416 GNUNET_ATS_Properties *prop);
417
418
419/**
420 * Handle for an address listing operation
421 */
422struct GNUNET_ATS_AddressListHandle;
423
424
425/**
426 * Get handle to access performance API of the ATS subsystem.
427 *
428 * @param cfg configuration to use
429 * @param addr_info_cb callback called when performance characteristics for
430 * an address change
431 * @param addr_info_cb_cls closure for @a addr_info_cb
432 * @return ats performance context
433 */
434struct GNUNET_ATS_PerformanceHandle *
435GNUNET_ATS_performance_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
436 GNUNET_ATS_AddressInformationCallback addr_info_cb,
437 void *addr_info_cb_cls);
438
439
440/**
441 * Get information about addresses known to the ATS subsystem.
442 *
443 * @param ph the performance handle to use
444 * @param peer peer idm can be NULL for all peers
445 * @param all #GNUNET_YES to get information about all addresses or #GNUNET_NO to
446 * get only address currently used
447 * @param infocb callback to call with the addresses,
448 * will callback with address == NULL when done
449 * @param infocb_cls closure for @a infocb
450 * @return handle to abort the operation
451 */
452struct GNUNET_ATS_AddressListHandle *
453GNUNET_ATS_performance_list_addresses (struct GNUNET_ATS_PerformanceHandle *ph,
454 const struct GNUNET_PeerIdentity *peer,
455 int all,
456 GNUNET_ATS_AddressInformationCallback
457 infocb,
458 void *infocb_cls);
459
460
461/**
462 * Cancel a pending address listing operation
463 *
464 * @param alh the `struct GNUNET_ATS_AddressListHandle` handle to cancel
465 */
466void
467GNUNET_ATS_performance_list_addresses_cancel (struct
468 GNUNET_ATS_AddressListHandle *alh);
469
470
471/**
472 * Client is done using the ATS performance subsystem, release resources.
473 *
474 * @param ph handle
475 */
476void
477GNUNET_ATS_performance_done (struct GNUNET_ATS_PerformanceHandle *ph);
478
479
480/**
481 * Function called with reservation result.
482 *
483 * @param cls closure
484 * @param peer identifies the peer
485 * @param amount set to the amount that was actually reserved or unreserved;
486 * either the full requested amount or zero (no partial reservations)
487 * @param res_delay if the reservation could not be satisfied (amount was 0), how
488 * long should the client wait until re-trying?
489 */
490typedef void
491(*GNUNET_ATS_ReservationCallback) (void *cls,
492 const struct GNUNET_PeerIdentity *peer,
493 int32_t amount,
494 struct GNUNET_TIME_Relative res_delay);
495
496
497/**
498 * Context that can be used to cancel a peer information request.
499 */
500struct GNUNET_ATS_ReservationContext;
501
502
503/**
504 * Reserve inbound bandwidth from the given peer. ATS will look at
505 * the current amount of traffic we receive from the peer and ensure
506 * that the peer could add 'amount' of data to its stream.
507 *
508 * @param ph performance handle
509 * @param peer identifies the peer
510 * @param amount reserve N bytes for receiving, negative
511 * amounts can be used to undo a (recent) reservation;
512 * @param rcb function to call with the resulting reservation information
513 * @param rcb_cls closure for @a rcb
514 * @return NULL on error
515 * @deprecated will be replaced soon
516 */
517struct GNUNET_ATS_ReservationContext *
518GNUNET_ATS_reserve_bandwidth (struct GNUNET_ATS_PerformanceHandle *ph,
519 const struct GNUNET_PeerIdentity *peer,
520 int32_t amount,
521 GNUNET_ATS_ReservationCallback rcb,
522 void *rcb_cls);
523
524
525/**
526 * Cancel request for reserving bandwidth.
527 *
528 * @param rc context returned by the original #GNUNET_ATS_reserve_bandwidth() call
529 */
530void
531GNUNET_ATS_reserve_bandwidth_cancel (struct GNUNET_ATS_ReservationContext *rc);
532
533
534/**
535 * ATS preference types as array initializer
536 */
537#define GNUNET_ATS_PreferenceType { GNUNET_ATS_PREFERENCE_BANDWIDTH, \
538 GNUNET_ATS_PREFERENCE_LATENCY, \
539 GNUNET_ATS_PREFERENCE_END }
540
541/**
542 * ATS preference types as string array initializer
543 */
544#define GNUNET_ATS_PreferenceTypeString { "BANDWIDTH", "LATENCY", "END" }
545
546/**
547 * Enum defining all known preference categories.
548 */
549enum GNUNET_ATS_PreferenceKind
550{
551 /**
552 * Change the peer's bandwidth value (value per byte of bandwidth in
553 * the goal function) to the given amount. The argument is followed
554 * by a double value giving the desired value (can be negative).
555 * Preference changes are forgotten if peers disconnect.
556 */
557 GNUNET_ATS_PREFERENCE_BANDWIDTH = 0,
558
559 /**
560 * Change the peer's latency value to the given amount. The
561 * argument is followed by a double value giving the desired value
562 * (can be negative). The absolute score in the goal function is
563 * the inverse of the latency in microseconds (minimum: 1
564 * microsecond) multiplied by the latency preferences.
565 */
566 GNUNET_ATS_PREFERENCE_LATENCY = 1,
567
568 /**
569 * End of preference list.
570 */
571 GNUNET_ATS_PREFERENCE_END = 2
572};
573
574
575/**
576 * Convert an `enum GNUNET_ATS_PreferenceType` to a string
577 *
578 * @param type the preference type
579 * @return a string or NULL if invalid
580 */
581const char *
582GNUNET_ATS_print_preference_type (enum GNUNET_ATS_PreferenceKind type);
583
584
585/**
586 * Change preferences for the given peer. Preference changes are
587 * forgotten if peers disconnect.
588 *
589 * @param ph performance handle
590 * @param peer identifies the peer
591 * @param ... #GNUNET_ATS_PREFERENCE_END-terminated specification of the
592 * desired changes
593 */
594void
595GNUNET_ATS_performance_change_preference (struct
596 GNUNET_ATS_PerformanceHandle *ph,
597 const struct
598 GNUNET_PeerIdentity *peer,
599 ...);
600
601
602/**
603 * Application feedback on how good preference requirements are fulfilled
604 * for the preferences included in the given time scope [now - scope .. now]
605 *
606 * An application notifies ATS if (and only if) it has feedback information
607 * for specific properties. This values are valid until the feedback scores are
608 * updated by the application.
609 *
610 * If the application has no feedback for this preference kind the application
611 * will not explicitly call for this property and will not include it in this
612 * function call.
613 *
614 * @param ph performance handle
615 * @param scope the time interval this valid for: [now - scope .. now]
616 * @param peer identifies the peer
617 * @param ... #GNUNET_ATS_PREFERENCE_END-terminated specification of the desired changes
618 */
619void
620GNUNET_ATS_performance_give_feedback (struct GNUNET_ATS_PerformanceHandle *ph,
621 const struct GNUNET_PeerIdentity *peer,
622 const struct GNUNET_TIME_Relative scope,
623 ...);
624
625#endif
626
627/** @} */ /* end of group */
628
629/** @} */ /* end of Backbone addition */
630
631/* end of file gnunet-service-transport_ats.h */