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22 * @file ats/gnunet-service-ats_addresses.h
23 * @brief ats service address management
24 * @author Matthias Wachs
25 * @author Christian Grothoff
27 #ifndef GNUNET_SERVICE_ATS_ADDRESSES_H
28 #define GNUNET_SERVICE_ATS_ADDRESSES_H
30 #include "gnunet_util_lib.h"
31 #include "gnunet_ats_service.h"
32 #include "gnunet-service-ats.h"
33 #include "gnunet_statistics_service.h"
37 * NOTE: Do not change this documentation. This documentation is based on
38 * gnunet.org:/vcs/fsnsg/ats-paper.git/tech-doku/ats-tech-guide.tex
39 * use build_txt.sh to generate plaintext output
41 * 1 ATS addresses : ATS address management
43 * This ATS addresses ("addresses") component manages the addresses known to
44 * ATS service and suggests addresses to transport service when it is
45 * interested in address suggestion for a peer. ATS addresses also
46 * instantiates the bandwidth assignment mechanism (solver), notifies it
47 * about changes to addresses and forwards changes to bandwidth assignments
48 * to transport, depending if transport is interested in this change.
54 * Addresses are added by specifying peer ID, plugin, address, address length
55 * and session, if available. ATS information can be specified if available.
59 * ATS specifies a fix set of networks an address can belong to. For each
60 * network an inbound and outbound quota will be specified. The available
61 * networks and addtional helper varaibles are defined in
62 * gnunet_ats_service.h. At the moment 5 networks are defined:
63 * * GNUNET_ATS_NET_UNSPECIFIED
64 * * GNUNET_ATS_NET_LOOPBACK
65 * * GNUNET_ATS_NET_LAN
66 * * GNUNET_ATS_NET_WAN
67 * * GNUNET_ATS_NET_WLAN
69 * The total number of networks defined is stored in
70 * GNUNET_ATS_NetworkTypeCount GNUNET_ATS_NetworkType can be used array
71 * initializer for an int array, while GNUNET_ATS_NetworkType is an
72 * initializer for a char array containing a string description of all
77 * An inbound and outbound quota for each of the networks mentioned in 1.1.2
78 * is loaded from ats configuration during initialization. This quota defines
79 * to total amount of inbound and outbound traffic allowed for a specific
80 * network. The configuration values used are in section ats:
81 * * "NETWORK"_QUOTA_IN = <value>
82 * * "NETWORK"_QUOTA_IN = <value>
84 * You can specify quotas by setting the <value> to a:
85 * * unrestricted: unlimited
86 * * number of bytes: e.g. 10240
87 * * fancy value: e.g. 64 Kib
89 * unlimited is defined as GNUNET_ATS_MaxBandwidthString and equivalent to
90 * the value GNUNET_ATS_MaxBandwidth Important predefined values for quotas
92 * * GNUNET_ATS_DefaultBandwidth: 65536
93 * * GNUNET_ATS_MaxBandwidth: UINT32_MAX
94 * * GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT: 1024
96 * Details of loading quotas and default values will be described on
98 * 1.1.4 Preference values
100 * 1.2 Data structures used
102 * Addresse uses struct ATS_Address for each address. The structs are stored
103 * in a linked list and provides a pointer void *solver_information for the
104 * solver to store address specific information. It provides the int values
105 * active which is set to GNUNET_YES if the address is select for transport
106 * use and used, representing that transport service is actively using this
107 * address. Address information are stored in peer, addr, addr_len, plugin.
111 * During initialization a hashmap to store addresses is created. The quotas
112 * for all networks defined for ATS are loaded from configuration. For each
113 * network first the logic will check if the string
114 * GNUNET_ATS_MaxBandwidthString is configured, if not it will try to convert
115 * the configured value as a fancy size and if this fails it will try to use
116 * it as a value_number. If no configuration value is found it will assign
117 * GNUNET_ATS_DefaultBandwidth. The most important step is to load the
118 * configured solver using configuration "[ats]:MODE". Current solvers are
119 * MODE_PROPORTIONAL, MODE_MLP. Interaction is done using a solver API
124 * * s_init: init the solver with required information
125 * * s_add: add a new address
126 * * s_update: update ATS values or session for an address
127 * * s_get: get prefered address for a peer
128 * * s_del: delete an address
129 * * s_pref: change preference value for a peer
130 * * s_done: shutdown solver
132 * Callbacks: addresses provides a bandwidth_changed_cb callback to the
133 * solver which is called when bandwidth assigned to peer has changed
137 * During shutdown all addresses are freed and the solver told to shutdown
139 * 1.6 Addresses and sessions
141 * Addresses consist of the address itself and a numerical session. When a
142 * new address without a session is added it has no session, so it gets
143 * session 0 assigned. When an address with a session is added and an address
144 * object with session 0 is found, this object is updated with the session
145 * otherwise a new address object with this session assigned is created.
149 * Addresses a1,a2 with session s1, s2 are "exact" if:
150 * (a1 == a2)&&(s1 == s2)
151 * Addresses a1,a2 with session s1, s2 are "equivalent" if:
152 * (a1 == a2)&&((s1 == s2)||(s1 == 0)||(s2 == 0)
154 * 1.7 Address management
156 * Transport service notifies ATS about changes to the addresses known to
159 * 1.7.1 Adding an address
161 * When transport learns a new address it tells ATS and ATS is telling
162 * addresses about it using GAS_address_add. If not known to addresses it
163 * creates a new address object and calls solver's s_add. ATS information are
164 * deserialized and solver is notified about the session and ATS information
167 * 1.7.2 Updating an address
169 * Addresses does an lookup up for the existing address with the given
170 * session. If disassembles included ATS information and notifies the solver
171 * using s_update about the update.
173 * 1.7.3 Deleting an address
175 * Addresses does an lookup for the exact address and session and if removes
176 * this address. If session != 0 the session is set to 0 and the address is
177 * kept. If session == 0, the addresses is removed.
179 * 1.7.4 Requesting an address suggestion
181 * The address client issues a request address message to be notified about
182 * address suggestions for a specific peer. Addresses asks the solver with
183 * s_get. If no address is available, it will not send a response, otherwise
184 * it will respond with the choosen address.
186 * 1.7.5 Address suggestions
188 * Addresses will notify the client automatically on any bandwidth_changed_cb
189 * by the solver if a address suggestion request is pending. If no address is
190 * available it will not respond at all If the client is not interested
191 * anymore, it has to cancel the address suggestion request.
193 * 1.7.6 Suggestions blocks and reset
195 * After suggesting an address it is blocked for ATS_BLOCKING_DELTA sec. to
196 * prevent the client from being thrashed. If the client requires immediately
197 * it can reset this block using GAS_addresses_handle_backoff_reset.
199 * 1.7.7 Marking address in use
201 * The client can notify addresses that it successfully uses an address and
202 * wants this address to be kept by calling GSA_address_in_use. Adresses will
203 * mark the address as used an notify the solver about the use.
205 * 1.7.8 Address lifecycle
208 * * (updated address) || (address in use)
211 * 1.8 Bandwidth assignment
213 * The addresses are used to perform resource allocation operations. ATS
214 * addresses takes care of instantiating the solver configured and notifies
215 * the respective solver about address changes and receives changes to the
216 * bandwidth assignment from the solver. The current bandwidth assignment is
217 * sent to transport. The specific solvers will be described in the specific
220 * 1.9 Changing peer preferences
222 * The bandwidth assigned to a peer can be influenced by setting a preference
223 * for a peer. The prefernce will be given to to the solver with s_pref which
224 * has to take care of the preference value
229 * Available ressource assignment modes
236 * Assign each peer an equal amount of bandwidth (bw)
238 * bw_per_peer = bw_total / #active addresses
245 * Solve ressource assignment as an optimization problem
246 * Uses an mixed integer programming solver
251 * Reinforcement Learning mode:
253 * Solve resource assignment using a learning agent
260 * How long will address suggestions blocked after a suggestion
262 #define ATS_BLOCKING_DELTA GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 100)
265 * Information provided by ATS normalization
267 struct GAS_NormalizationInfo
270 * Next index to use in averaging queue
272 unsigned int avg_queue_index;
277 uint32_t atsi_abs[GAS_normalization_queue_length];
280 * Averaged ATSI values from queue
285 * Normalized values from queue to a range of values [1.0...2.0]
291 * Address with additional information
296 * Next element in DLL
298 struct ATS_Address *next;
301 * Previous element in DLL
303 struct ATS_Address *prev;
308 struct GNUNET_PeerIdentity peer;
311 * Session ID, 0 if no session is given
315 uint32_t local_address_info;
333 * Solver specific information for this address
335 void *solver_information;
338 * ATS performance information for this address
340 struct GNUNET_ATS_Information *atsi;
343 * ATS performance information for this address
348 * Inbound bandwidth assigned by solver in NBO
350 struct GNUNET_BANDWIDTH_Value32NBO assigned_bw_in;
353 * Outbound bandwidth assigned by solver in NBO
355 struct GNUNET_BANDWIDTH_Value32NBO assigned_bw_out;
360 struct GNUNET_TIME_Relative block_interval;
363 * Time when address can be suggested again
365 struct GNUNET_TIME_Absolute blocked_until;
368 * Time when address had last activity (update, in uses)
370 struct GNUNET_TIME_Absolute t_last_activity;
373 * Time when address was added
375 struct GNUNET_TIME_Absolute t_added;
378 * Is this the active address for this peer?
383 * Is this the address for this peer in use?
388 * Normalized ATS performance information for this address
389 * Each entry can be accessed using the GNUNET_ATS_QualityProperties avg_queue_index
391 struct GAS_NormalizationInfo atsin[GNUNET_ATS_QualityPropertiesCount];
397 * Initialize address subsystem. The addresses subsystem manages the addresses
398 * known and current performance information. It has a solver component
399 * responsible for the resource allocation. It tells the solver about changes
400 * and receives updates when the solver changes the ressource allocation.
402 * @param cfg configuration to use
403 * @param stats the statistics handle to use
404 * @return an address handle
406 struct GAS_Addresses_Handle *
407 GAS_addresses_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
408 const struct GNUNET_STATISTICS_Handle *stats);
411 * Shutdown address subsystem.
413 * @param handle the address handle to shutdown
416 GAS_addresses_done (struct GAS_Addresses_Handle *handle);
419 * Add a new address for a peer.
421 * @param handle the address handle to use
423 * @param plugin_name transport plugin name
424 * @param plugin_addr plugin address
425 * @param plugin_addr_len length of the plugin address
426 * @param local_address_info the local address for the address
427 * @param session_id session id, can be 0
428 * @param atsi performance information for this address
429 * @param atsi_count number of performance information contained
432 GAS_addresses_add (struct GAS_Addresses_Handle *handle,
433 const struct GNUNET_PeerIdentity *peer,
434 const char *plugin_name,
435 const void *plugin_addr,
436 size_t plugin_addr_len,
437 uint32_t local_address_info,
439 const struct GNUNET_ATS_Information *atsi,
440 uint32_t atsi_count);
443 * Notification about active use of an address.
444 * in_use == GNUNET_YES:
445 * This address is used to maintain an active connection with a peer.
446 * in_use == GNUNET_NO:
447 * This address is no longer used to maintain an active connection with a peer.
449 * Note: can only be called with in_use == GNUNET_NO if called with GNUNET_YES
452 * @param handle the address handle to use
454 * @param plugin_name transport plugin name
455 * @param plugin_addr plugin address
456 * @param plugin_addr_len length of the plugin address
457 * @param local_address_info the local address for the address
458 * @param session_id session id, can be 0
459 * @param in_use GNUNET_YES if GNUNET_NO
460 * @return GNUNET_SYSERR on failure (address unknown ...)
463 GAS_addresses_in_use (struct GAS_Addresses_Handle *handle,
464 const struct GNUNET_PeerIdentity *peer, const char *plugin_name,
465 const void *plugin_addr, size_t plugin_addr_len,
466 uint32_t local_address_info,
471 * Update an address with a session or performance information for a peer.
473 * If an address was added without a session it will be updated with the
476 * @param handle the address handle to use
478 * @param plugin_name transport plugin name
479 * @param plugin_addr plugin address
480 * @param plugin_addr_len length of the plugin address
481 * @param local_address_info the local address for the address
482 * @param session_id session id, can be 0
483 * @param atsi performance information for this address
484 * @param atsi_count number of performance information contained
487 GAS_addresses_update (struct GAS_Addresses_Handle *handle,
488 const struct GNUNET_PeerIdentity *peer, const char *plugin_name,
489 const void *plugin_addr, size_t plugin_addr_len,
490 uint32_t local_address_info, uint32_t session_id,
491 const struct GNUNET_ATS_Information *atsi, uint32_t atsi_count);
494 * Remove an address or just a session for a peer.
496 * @param handle the address handle to use
498 * @param plugin_name transport plugin name
499 * @param plugin_addr plugin address
500 * @param plugin_addr_len length of the plugin address
501 * @param session_id session id, can be 0
502 * @param local_address_info the local address for the address
505 GAS_addresses_destroy (struct GAS_Addresses_Handle *handle,
506 const struct GNUNET_PeerIdentity *peer, const char *plugin_name,
507 const void *plugin_addr, size_t plugin_addr_len,
508 uint32_t local_address_info, uint32_t session_id);
511 * Remove all addresses
513 * @param handle the address handle to use
516 GAS_addresses_destroy_all (struct GAS_Addresses_Handle *handle);
519 * Request address suggestions for a peer
521 * @param handle the address handle
522 * @param peer the peer id
525 GAS_addresses_request_address (struct GAS_Addresses_Handle *handle,
526 const struct GNUNET_PeerIdentity *peer);
529 * Cancel address suggestions for a peer
531 * @param handle the address handle
532 * @param peer the peer id
535 GAS_addresses_request_address_cancel (struct GAS_Addresses_Handle *handle,
536 const struct GNUNET_PeerIdentity *peer);
539 * Reset suggestion backoff for a peer
541 * Suggesting addresses is blocked for ATS_BLOCKING_DELTA. Blocking can be
542 * reset using this function
544 * @param handle the address handle
545 * @param peer the peer id
548 GAS_addresses_handle_backoff_reset (struct GAS_Addresses_Handle *handle,
549 const struct GNUNET_PeerIdentity *peer);
553 * A performance client disconnected
555 * @param handle address handle
556 * @param client the client
560 GAS_addresses_preference_client_disconnect (struct GAS_Addresses_Handle *handle,
564 * Change the preference for a peer
566 * @param handle the address handle
567 * @param client the client sending this request
568 * @param peer the peer id
569 * @param kind the preference kind to change
570 * @param score_abs the new preference score
573 GAS_addresses_preference_change (struct GAS_Addresses_Handle *handle,
574 void *client, const struct GNUNET_PeerIdentity *peer,
575 enum GNUNET_ATS_PreferenceKind kind, float score_abs);
578 * Application feedback on how good preference requirements are fulfilled
579 * for a specific preference in the given time scope [now - scope .. now]
581 * An application notifies ATS if (and only if) it has feedback information
582 * for a specific property. This value is valid until the feedback score is
583 * updated by the application.
585 * If the application has no feedback for this preference kind the application
586 * will not explicitly call.
588 * @param handle the address handle
589 * @param application the application sending this request
590 * @param peer the peer id
591 * @param scope the time interval this valid for: [now - scope .. now]
592 * @param kind the preference kind this feedback is intended for
593 * @param score_abs the new preference score
596 GAS_addresses_preference_feedback (struct GAS_Addresses_Handle *handle,
597 void *application, const struct GNUNET_PeerIdentity *peer,
598 const struct GNUNET_TIME_Relative scope,
599 enum GNUNET_ATS_PreferenceKind kind, float score_abs);
602 * Iterator for GAS_addresses_iterate_peers
604 * @param p_it_cls closure
605 * @param id the peer id
608 (*GNUNET_ATS_Peer_Iterator) (void *p_it_cls,
609 const struct GNUNET_PeerIdentity *id);
612 * Return all peers currently known to ATS
614 * @param handle the address handle to use
615 * @param p_it the iterator to call for every peer
616 * @param p_it_cls the closure for the iterator
619 GAS_addresses_iterate_peers (struct GAS_Addresses_Handle *handle,
620 GNUNET_ATS_Peer_Iterator p_it, void *p_it_cls);
623 * Iterator for GAS_addresses_get_peer_info
625 * @param p_it_cls closure closure
626 * @param id the peer id
627 * @param plugin_name plugin name
628 * @param plugin_addr address
629 * @param plugin_addr_len address length
630 * @param address_active is address actively used
631 * @param atsi ats performance information
632 * @param atsi_count number of ats performance elements
633 * @param bandwidth_out current outbound bandwidth assigned to address
634 * @param bandwidth_in current inbound bandwidth assigned to address
637 (*GNUNET_ATS_PeerInfo_Iterator) (void *p_it_cls,
638 const struct GNUNET_PeerIdentity *id, const char *plugin_name,
639 const void *plugin_addr, size_t plugin_addr_len, const int address_active,
640 const struct GNUNET_ATS_Information *atsi, uint32_t atsi_count,
641 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
642 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in);
645 * Return information all peers currently known to ATS
647 * @param handle the address handle to use
648 * @param peer the respective peer
649 * @param pi_it the iterator to call for every peer
650 * @param pi_it_cls the closure for the iterator
653 GAS_addresses_get_peer_info (struct GAS_Addresses_Handle *handle,
654 const struct GNUNET_PeerIdentity *peer, GNUNET_ATS_PeerInfo_Iterator pi_it,
659 /* end of gnunet-service-ats_addresses.h */