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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_SIMPLISTIC, 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
230 * How long will address suggestions blocked after a suggestion
232 #define ATS_BLOCKING_DELTA GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 100)
234 struct GAS_Addresses_Handle;
237 struct GAS_NormalizationInfo
241 uint32_t atsi_abs[GAS_normalization_queue_length];
245 * Address with additional information
250 * Next element in DLL
252 struct ATS_Address *next;
255 * Previous element in DLL
257 struct ATS_Address *prev;
262 struct GNUNET_PeerIdentity peer;
265 * Session ID, 0 if no session is given
285 * Solver specific information for this address
287 void *solver_information;
290 * ATS performance information for this address
292 struct GNUNET_ATS_Information *atsi;
295 * ATS performance information for this address
301 struct GNUNET_TIME_Relative atsp_latency;
304 struct GNUNET_BANDWIDTH_Value32NBO atsp_utilization_in;
307 struct GNUNET_BANDWIDTH_Value32NBO atsp_utilization_out;
311 uint32_t atsp_distance;
314 uint32_t atsp_cost_wan;
317 uint32_t atsp_cost_lan;
320 uint32_t atsp_cost_wlan;
323 uint32_t atsp_network_type;
326 * Inbound bandwidth assigned by solver in NBO
328 struct GNUNET_BANDWIDTH_Value32NBO assigned_bw_in;
331 * Outbound bandwidth assigned by solver in NBO
333 struct GNUNET_BANDWIDTH_Value32NBO assigned_bw_out;
338 struct GNUNET_TIME_Relative block_interval;
341 * Time when address can be suggested again
343 struct GNUNET_TIME_Absolute blocked_until;
346 * Is this the active address for this peer?
351 * Is this the address for this peer in use?
356 * Normalized ATS performance information for this address
357 * Each entry can be accessed using the GNUNET_ATS_QualityProperties index
359 struct GAS_NormalizationInfo atsin[GNUNET_ATS_QualityPropertiesCount];
364 * Callback to call from solver when bandwidth for address has changed
366 * @param address the with changed bandwidth assigned
370 (*GAS_bandwidth_changed_cb) (void *cls, struct ATS_Address *address);
372 typedef const double *
373 (*GAS_get_preferences) (void *cls, const struct GNUNET_PeerIdentity *id);
382 * Init the simplistic problem solving component
385 * network[i] contains the network type as type GNUNET_ATS_NetworkType[i]
386 * out_quota[i] contains outbound quota for network type i
387 * in_quota[i] contains inbound quota for network type i
390 * network = {GNUNET_ATS_NET_UNSPECIFIED, GNUNET_ATS_NET_LOOPBACK, GNUNET_ATS_NET_LAN, GNUNET_ATS_NET_WAN, GNUNET_ATS_NET_WLAN}
391 * network[2] == GNUNET_ATS_NET_LAN
392 * out_quota[2] == 65353
393 * in_quota[2] == 65353
395 * @param cfg configuration handle
396 * @param stats the GNUNET_STATISTICS handle
397 * @param network array of GNUNET_ATS_NetworkType with length dest_length
398 * @param out_quota array of outbound quotas
399 * @param in_quota array of outbound quota
400 * @param bw_changed_cb callback to call when assigned changes
401 * @return handle for the solver on success, NULL on fail
404 (*GAS_solver_init) (const struct GNUNET_CONFIGURATION_Handle *cfg,
405 const struct GNUNET_STATISTICS_Handle *stats,
407 unsigned long long *out_quota,
408 unsigned long long *in_quota,
410 GAS_bandwidth_changed_cb bw_changed_cb,
411 void *bw_changed_cb_cls,
412 GAS_get_preferences get_preference,
413 void *get_preference_cls);
417 * Change the preference for a peer
419 * @param handle the solver handle
420 * @param client the client sending this request
421 * @param peer the peer id
422 * @param kind the preference kind to change
423 * @param score the new preference score
424 * @param pref_rel the normalized preference value for this kind over all clients
427 (*GAS_solver_address_change_preference) (void *solver,
428 struct GNUNET_CONTAINER_MultiHashMap *addresses,
429 const struct GNUNET_PeerIdentity *peer,
430 enum GNUNET_ATS_PreferenceKind kind,
434 * Add a single address within a network to the solver
436 * @param solver the solver Handle
437 * @param addresses the address hashmap containing all addresses
438 * @param address the address to add
439 * @param network network type of this address
442 (*GAS_solver_address_add) (void *solver,
443 struct GNUNET_CONTAINER_MultiHashMap *addresses,
444 struct ATS_Address *address,
449 * Delete an address or just the session from the solver
451 * @param solver the solver Handle
452 * @param addresses the address hashmap containing all addresses
453 * @param address the address to delete
454 * @param session_only remove address or just session
457 (*GAS_solver_address_delete) (void *solver,
458 struct GNUNET_CONTAINER_MultiHashMap *addresses,
459 struct ATS_Address *address,
463 * Notify the solver about an update for an address
465 * @param solver the solver to use
466 * @param addresses the address hashmap containing all addresses
467 * @param address the address
468 * @param session the previous session
469 * @param in_use previous address used state: yes or no
470 * @param atsi ats previous performance information
471 * @param atsi_count previous number of ats performance information
475 (*GAS_solver_address_update) (void *solver,
476 struct GNUNET_CONTAINER_MultiHashMap *addresses,
477 struct ATS_Address *address,
478 uint32_t prev_session,
480 const struct GNUNET_ATS_Information *prev_atsi,
481 uint32_t prev_atsi_count);
485 * Get the prefered address for a peer from solver
487 * @param solver the solver to use
488 * @param addresses the address hashmap containing all addresses
489 * @param peer the peer
491 typedef const struct ATS_Address *
492 (*GAS_solver_get_preferred_address) (void *solver,
493 struct GNUNET_CONTAINER_MultiHashMap *addresses,
494 const struct GNUNET_PeerIdentity *peer);
498 * Stop getting the prefered address for a peer from solver
500 * @param solver the solver to use
501 * @param addresses the address hashmap containing all addresses
502 * @param peer the peer
505 (*GAS_solver_stop_get_preferred_address) (void *solver,
506 struct GNUNET_CONTAINER_MultiHashMap *addresses,
507 const struct GNUNET_PeerIdentity *peer);
512 * @param solver the solver to shutdown
516 (*GAS_solver_done) (void *solver);
520 * Initialize address subsystem. The addresses subsystem manages the addresses
521 * known and current performance information. It has a solver component
522 * responsible for the resource allocation. It tells the solver about changes
523 * and receives updates when the solver changes the ressource allocation.
525 * @param cfg configuration to use
526 * @param stats the statistics handle to use
527 * @return an address handle
529 struct GAS_Addresses_Handle *
530 GAS_addresses_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
531 const struct GNUNET_STATISTICS_Handle *stats);
535 * Shutdown address subsystem.
537 * @param handle the address handle to shutdown
540 GAS_addresses_done (struct GAS_Addresses_Handle *handle);
544 * Add a new address for a peer.
546 * @param handle the address handle to use
548 * @param plugin_name transport plugin name
549 * @param plugin_addr plugin address
550 * @param plugin_addr_len length of the plugin address
551 * @param session_id session id, can be 0
552 * @param atsi performance information for this address
553 * @param atsi_count number of performance information contained
556 GAS_addresses_add (struct GAS_Addresses_Handle *handle,
557 const struct GNUNET_PeerIdentity *peer,
558 const char *plugin_name,
559 const void *plugin_addr,
560 size_t plugin_addr_len,
562 const struct GNUNET_ATS_Information *atsi,
563 uint32_t atsi_count);
567 * Notification about active use of an address.
568 * in_use == GNUNET_YES:
569 * This address is used to maintain an active connection with a peer.
570 * in_use == GNUNET_NO:
571 * This address is no longer used to maintain an active connection with a peer.
573 * Note: can only be called with in_use == GNUNET_NO if called with GNUNET_YES
576 * @param handle the address handle to use
578 * @param plugin_name transport plugin name
579 * @param plugin_addr plugin address
580 * @param plugin_addr_len length of the plugin address
581 * @param session_id session id, can be 0
582 * @param in_use GNUNET_YES if GNUNET_NO
583 * @return GNUNET_SYSERR on failure (address unknown ...)
586 GAS_addresses_in_use (struct GAS_Addresses_Handle *handle,
587 const struct GNUNET_PeerIdentity *peer,
588 const char *plugin_name,
589 const void *plugin_addr,
590 size_t plugin_addr_len,
596 * Update an address with a session or performance information for a peer.
598 * If an address was added without a session it will be updated with the
601 * @param handle the address handle to use
603 * @param plugin_name transport plugin name
604 * @param plugin_addr plugin address
605 * @param plugin_addr_len length of the plugin address
606 * @param session_id session id, can be 0
607 * @param atsi performance information for this address
608 * @param atsi_count number of performance information contained
611 GAS_addresses_update (struct GAS_Addresses_Handle *handle,
612 const struct GNUNET_PeerIdentity *peer,
613 const char *plugin_name,
614 const void *plugin_addr,
615 size_t plugin_addr_len,
617 const struct GNUNET_ATS_Information *atsi,
618 uint32_t atsi_count);
622 * Remove an address or just a session for a peer.
624 * @param handle the address handle to use
626 * @param plugin_name transport plugin name
627 * @param plugin_addr plugin address
628 * @param plugin_addr_len length of the plugin address
629 * @param session_id session id, can be 0
632 GAS_addresses_destroy (struct GAS_Addresses_Handle *handle,
633 const struct GNUNET_PeerIdentity *peer,
634 const char *plugin_name,
635 const void *plugin_addr,
636 size_t plugin_addr_len,
637 uint32_t session_id);
641 * Remove all addresses
643 * @param handle the address handle to use
646 GAS_addresses_destroy_all (struct GAS_Addresses_Handle *handle);
650 * Request address suggestions for a peer
652 * @param handle the address handle
653 * @param peer the peer id
656 GAS_addresses_request_address (struct GAS_Addresses_Handle *handle,
657 const struct GNUNET_PeerIdentity *peer);
660 * Cancel address suggestions for a peer
662 * @param handle the address handle
663 * @param peer the peer id
666 GAS_addresses_request_address_cancel (struct GAS_Addresses_Handle *handle,
667 const struct GNUNET_PeerIdentity *peer);
671 * Reset suggestion backoff for a peer
673 * Suggesting addresses is blocked for ATS_BLOCKING_DELTA. Blocking can be
674 * reset using this function
676 * @param handle the address handle
677 * @param peer the peer id
680 GAS_addresses_handle_backoff_reset (struct GAS_Addresses_Handle *handle,
681 const struct GNUNET_PeerIdentity *peer);
685 * Change the preference for a peer
687 * @param handle the address handle
688 * @param client the client sending this request
689 * @param peer the peer id
690 * @param kind the preference kind to change
691 * @param score_abs the new preference score
694 GAS_addresses_change_preference (struct GAS_Addresses_Handle *handle,
696 const struct GNUNET_PeerIdentity *peer,
697 enum GNUNET_ATS_PreferenceKind kind,
702 * Iterator for GAS_addresses_iterate_peers
704 * @param p_it_cls closure
705 * @param id the peer id
707 typedef void (*GNUNET_ATS_Peer_Iterator) (void *p_it_cls,
708 const struct GNUNET_PeerIdentity *id);
712 * Return all peers currently known to ATS
714 * @param handle the address handle to use
715 * @param p_it the iterator to call for every peer
716 * @param p_it_cls the closure for the iterator
719 GAS_addresses_iterate_peers (struct GAS_Addresses_Handle *handle,
720 GNUNET_ATS_Peer_Iterator p_it,
725 * Iterator for GAS_addresses_get_peer_info
727 * @param p_it_cls closure closure
728 * @param id the peer id
729 * @param plugin_name plugin name
730 * @param plugin_addr address
731 * @param plugin_addr_len address length
732 * @param address_active is address actively used
733 * @param atsi ats performance information
734 * @param atsi_count number of ats performance elements
735 * @param bandwidth_out current outbound bandwidth assigned to address
736 * @param bandwidth_in current inbound bandwidth assigned to address
738 typedef void (*GNUNET_ATS_PeerInfo_Iterator) (void *p_it_cls,
739 const struct GNUNET_PeerIdentity *id,
740 const char *plugin_name,
741 const void *plugin_addr,
742 size_t plugin_addr_len,
743 const int address_active,
744 const struct GNUNET_ATS_Information *atsi,
746 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
747 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in);
751 * Return information all peers currently known to ATS
753 * @param handle the address handle to use
754 * @param peer the respective peer
755 * @param pi_it the iterator to call for every peer
756 * @param pi_it_cls the closure for the iterator
759 GAS_addresses_get_peer_info (struct GAS_Addresses_Handle *handle,
760 const struct GNUNET_PeerIdentity *peer,
761 GNUNET_ATS_PeerInfo_Iterator pi_it,
766 /* end of gnunet-service-ats_addresses.h */