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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
230 * How long will address suggestions blocked after a suggestion
232 #define ATS_BLOCKING_DELTA GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 100)
236 * Information provided by ATS normalization
238 struct GAS_NormalizationInfo
241 * Next index to use in averaging queue
243 unsigned int avg_queue_index;
248 uint32_t atsi_abs[GAS_normalization_queue_length];
251 * Averaged ATSI values from queue
256 * Normalized values from queue to a range of values [1.0...2.0]
263 * Address with additional information
268 * Next element in DLL
270 struct ATS_Address *next;
273 * Previous element in DLL
275 struct ATS_Address *prev;
280 struct GNUNET_PeerIdentity peer;
283 * Session ID, 0 if no session is given
303 * Solver specific information for this address
305 void *solver_information;
308 * ATS performance information for this address
310 struct GNUNET_ATS_Information *atsi;
313 * ATS performance information for this address
318 * Inbound bandwidth assigned by solver in NBO
320 struct GNUNET_BANDWIDTH_Value32NBO assigned_bw_in;
323 * Outbound bandwidth assigned by solver in NBO
325 struct GNUNET_BANDWIDTH_Value32NBO assigned_bw_out;
330 struct GNUNET_TIME_Relative block_interval;
333 * Time when address can be suggested again
335 struct GNUNET_TIME_Absolute blocked_until;
338 * Is this the active address for this peer?
343 * Is this the address for this peer in use?
348 * Normalized ATS performance information for this address
349 * Each entry can be accessed using the GNUNET_ATS_QualityProperties avg_queue_index
351 struct GAS_NormalizationInfo atsin[GNUNET_ATS_QualityPropertiesCount];
356 * Callback to call from solver when bandwidth for address has changed
358 * @param address the with changed bandwidth assigned
361 (*GAS_bandwidth_changed_cb) (void *cls, struct ATS_Address *address);
365 * Callback to call from solver to obtain application preference values for a
369 * @param id the peer id
370 * @return carry of double values containing the preferences with
371 * GNUNET_ATS_PreferenceCount elements
373 typedef const double *
374 (*GAS_get_preferences) (void *cls, const struct GNUNET_PeerIdentity *id);
378 * Callback to call from solver to obtain transport properties for an
382 * @param address the address
383 * @return carry of double values containing the preferences with
384 * GNUNET_ATS_PreferenceCount elements
386 typedef const double *
387 (*GAS_get_properties) (void *cls, const struct ATS_Address *address);
397 * Init the problem solving component
400 * network[i] contains the network type as type GNUNET_ATS_NetworkType[i]
401 * out_quota[i] contains outbound quota for network type i
402 * in_quota[i] contains inbound quota for network type i
405 * network = {GNUNET_ATS_NET_UNSPECIFIED, GNUNET_ATS_NET_LOOPBACK, GNUNET_ATS_NET_LAN, GNUNET_ATS_NET_WAN, GNUNET_ATS_NET_WLAN}
406 * network[2] == GNUNET_ATS_NET_LAN
407 * out_quota[2] == 65353
408 * in_quota[2] == 65353
410 * @param cfg configuration handle
411 * @param stats the GNUNET_STATISTICS handle
412 * @param addresses hashmap containing all addresses
413 * @param network array of GNUNET_ATS_NetworkType with length dest_length
414 * @param out_quota array of outbound quotas
415 * @param in_quota array of outbound quota
416 * @param bw_changed_cb callback to call when assigned changes
417 * @return handle for the solver on success, NULL on fail
420 (*GAS_solver_init) (const struct GNUNET_CONFIGURATION_Handle *cfg,
421 const struct GNUNET_STATISTICS_Handle *stats,
422 const struct GNUNET_CONTAINER_MultiHashMap *addresses,
424 unsigned long long *out_quota,
425 unsigned long long *in_quota,
427 GAS_bandwidth_changed_cb bw_changed_cb,
428 void *bw_changed_cb_cls,
429 GAS_get_preferences get_preference,
430 void *get_preference_cls,
431 GAS_get_properties get_properties,
432 void *get_properties_cls);
436 * Change the preference for a peer
438 * @param handle the solver handle
439 * @param client the client sending this request
440 * @param peer the peer id
441 * @param kind the preference kind to change
442 * @param score the new preference score
443 * @param pref_rel the normalized preference value for this kind over all clients
446 (*GAS_solver_address_change_preference) (void *solver,
447 const struct GNUNET_PeerIdentity *peer,
448 enum GNUNET_ATS_PreferenceKind kind,
453 * Give feedback about the current assignment
455 * @param handle the solver handle
456 * @param application the application sending this request
457 * @param peer the peer id
458 * @param scope the time interval for this feedback: [now - scope .. now]
459 * @param kind the preference kind for this feedback
460 * @param score the feedback score
463 (*GAS_solver_address_feedback_preference) (void *solver,
465 const struct GNUNET_PeerIdentity *peer,
466 const struct GNUNET_TIME_Relative scope,
467 enum GNUNET_ATS_PreferenceKind kind,
471 * Notify the solver about a bulk operation changing possibly a lot of values
472 * Solver will not resolve until all bulk operations are marked as done
474 * @param solver the solver
477 (*GAS_solver_bulk_start) (void *solver);
481 * Mark a bulk operation as done
482 * Solver will resolve if values have changed
484 * @param solver the solver
487 (*GAS_solver_bulk_stop) (void *solver);
491 * Add a single address within a network to the solver
493 * @param solver the solver Handle
494 * @param addresses the address hashmap containing all addresses
495 * @param address the address to add
496 * @param network network type of this address
499 (*GAS_solver_address_add) (void *solver,
500 struct ATS_Address *address,
505 * Delete an address or just the session from the solver
507 * @param solver the solver Handle
508 * @param addresses the address hashmap containing all addresses
509 * @param address the address to delete
510 * @param session_only remove address or just session
513 (*GAS_solver_address_delete) (void *solver,
514 struct ATS_Address *address,
519 * Transport properties for this address have changed
521 * @param solver solver handle
522 * @param address the address
523 * @param type the ATSI type in HBO
524 * @param abs_value the absolute value of the property
525 * @param rel_value the normalized value
528 (*GAS_solver_address_property_changed) (void *solver,
529 struct ATS_Address *address,
536 * Transport session for this address has changed
538 * NOTE: values in addresses are already updated
540 * @param solver solver handle
541 * @param address the address
542 * @param cur_session the current session
543 * @param new_session the new session
546 (*GAS_solver_address_session_changed) (void *solver,
547 struct ATS_Address *address,
548 uint32_t cur_session,
549 uint32_t new_session);
552 * Transport session for this address has changed
554 * NOTE: values in addresses are already updated
556 * @param solver solver handle
557 * @param address the address
558 * @param in_use usage state
561 (*GAS_solver_address_inuse_changed) (void *solver,
562 struct ATS_Address *address,
566 * Network scope for this address has changed
568 * NOTE: values in addresses are already updated
570 * @param solver solver handle
571 * @param address the address
572 * @param current_network the current network
573 * @param new_network the new network
576 (*GAS_solver_address_network_changed) (void *solver,
577 struct ATS_Address *address,
578 uint32_t current_network,
579 uint32_t new_network);
583 * Get the prefered address for a peer from solver
585 * @param solver the solver to use
586 * @param addresses the address hashmap containing all addresses
587 * @param peer the peer
589 typedef const struct ATS_Address *
590 (*GAS_solver_get_preferred_address) (void *solver,
591 const struct GNUNET_PeerIdentity *peer);
595 * Stop getting the prefered address for a peer from solver
597 * @param solver the solver to use
598 * @param addresses the address hashmap containing all addresses
599 * @param peer the peer
602 (*GAS_solver_stop_get_preferred_address) (void *solver,
603 const struct GNUNET_PeerIdentity *peer);
608 * @param solver the solver to shutdown
612 (*GAS_solver_done) (void *solver);
616 * Initialize address subsystem. The addresses subsystem manages the addresses
617 * known and current performance information. It has a solver component
618 * responsible for the resource allocation. It tells the solver about changes
619 * and receives updates when the solver changes the ressource allocation.
621 * @param cfg configuration to use
622 * @param stats the statistics handle to use
623 * @return an address handle
625 struct GAS_Addresses_Handle *
626 GAS_addresses_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
627 const struct GNUNET_STATISTICS_Handle *stats);
631 * Shutdown address subsystem.
633 * @param handle the address handle to shutdown
636 GAS_addresses_done (struct GAS_Addresses_Handle *handle);
640 * Add a new address for a peer.
642 * @param handle the address handle to use
644 * @param plugin_name transport plugin name
645 * @param plugin_addr plugin address
646 * @param plugin_addr_len length of the plugin address
647 * @param session_id session id, can be 0
648 * @param atsi performance information for this address
649 * @param atsi_count number of performance information contained
652 GAS_addresses_add (struct GAS_Addresses_Handle *handle,
653 const struct GNUNET_PeerIdentity *peer,
654 const char *plugin_name,
655 const void *plugin_addr,
656 size_t plugin_addr_len,
658 const struct GNUNET_ATS_Information *atsi,
659 uint32_t atsi_count);
663 * Notification about active use of an address.
664 * in_use == GNUNET_YES:
665 * This address is used to maintain an active connection with a peer.
666 * in_use == GNUNET_NO:
667 * This address is no longer used to maintain an active connection with a peer.
669 * Note: can only be called with in_use == GNUNET_NO if called with GNUNET_YES
672 * @param handle the address handle to use
674 * @param plugin_name transport plugin name
675 * @param plugin_addr plugin address
676 * @param plugin_addr_len length of the plugin address
677 * @param session_id session id, can be 0
678 * @param in_use GNUNET_YES if GNUNET_NO
679 * @return GNUNET_SYSERR on failure (address unknown ...)
682 GAS_addresses_in_use (struct GAS_Addresses_Handle *handle,
683 const struct GNUNET_PeerIdentity *peer,
684 const char *plugin_name,
685 const void *plugin_addr,
686 size_t plugin_addr_len,
692 * Update an address with a session or performance information for a peer.
694 * If an address was added without a session it will be updated with the
697 * @param handle the address handle to use
699 * @param plugin_name transport plugin name
700 * @param plugin_addr plugin address
701 * @param plugin_addr_len length of the plugin address
702 * @param session_id session id, can be 0
703 * @param atsi performance information for this address
704 * @param atsi_count number of performance information contained
707 GAS_addresses_update (struct GAS_Addresses_Handle *handle,
708 const struct GNUNET_PeerIdentity *peer,
709 const char *plugin_name,
710 const void *plugin_addr,
711 size_t plugin_addr_len,
713 const struct GNUNET_ATS_Information *atsi,
714 uint32_t atsi_count);
718 * Remove an address or just a session for a peer.
720 * @param handle the address handle to use
722 * @param plugin_name transport plugin name
723 * @param plugin_addr plugin address
724 * @param plugin_addr_len length of the plugin address
725 * @param session_id session id, can be 0
728 GAS_addresses_destroy (struct GAS_Addresses_Handle *handle,
729 const struct GNUNET_PeerIdentity *peer,
730 const char *plugin_name,
731 const void *plugin_addr,
732 size_t plugin_addr_len,
733 uint32_t session_id);
737 * Remove all addresses
739 * @param handle the address handle to use
742 GAS_addresses_destroy_all (struct GAS_Addresses_Handle *handle);
746 * Request address suggestions for a peer
748 * @param handle the address handle
749 * @param peer the peer id
752 GAS_addresses_request_address (struct GAS_Addresses_Handle *handle,
753 const struct GNUNET_PeerIdentity *peer);
756 * Cancel address suggestions for a peer
758 * @param handle the address handle
759 * @param peer the peer id
762 GAS_addresses_request_address_cancel (struct GAS_Addresses_Handle *handle,
763 const struct GNUNET_PeerIdentity *peer);
767 * Reset suggestion backoff for a peer
769 * Suggesting addresses is blocked for ATS_BLOCKING_DELTA. Blocking can be
770 * reset using this function
772 * @param handle the address handle
773 * @param peer the peer id
776 GAS_addresses_handle_backoff_reset (struct GAS_Addresses_Handle *handle,
777 const struct GNUNET_PeerIdentity *peer);
781 * Change the preference for a peer
783 * @param handle the address handle
784 * @param client the client sending this request
785 * @param peer the peer id
786 * @param kind the preference kind to change
787 * @param score_abs the new preference score
790 GAS_addresses_change_preference (struct GAS_Addresses_Handle *handle,
792 const struct GNUNET_PeerIdentity *peer,
793 enum GNUNET_ATS_PreferenceKind kind,
798 * Change the preference for a peer
800 * @param handle the address handle
801 * @param application the client sending this request
802 * @param peer the peer id
803 * @param scope the time interval this valid for: [now - scope .. now]
804 * @param kind the preference kind to change
805 * @param score_abs the new preference score
808 GAS_addresses_preference_feedback (struct GAS_Addresses_Handle *handle,
810 const struct GNUNET_PeerIdentity *peer,
811 const struct GNUNET_TIME_Relative scope,
812 enum GNUNET_ATS_PreferenceKind kind,
817 * Iterator for GAS_addresses_iterate_peers
819 * @param p_it_cls closure
820 * @param id the peer id
822 typedef void (*GNUNET_ATS_Peer_Iterator) (void *p_it_cls,
823 const struct GNUNET_PeerIdentity *id);
827 * Return all peers currently known to ATS
829 * @param handle the address handle to use
830 * @param p_it the iterator to call for every peer
831 * @param p_it_cls the closure for the iterator
834 GAS_addresses_iterate_peers (struct GAS_Addresses_Handle *handle,
835 GNUNET_ATS_Peer_Iterator p_it,
840 * Iterator for GAS_addresses_get_peer_info
842 * @param p_it_cls closure closure
843 * @param id the peer id
844 * @param plugin_name plugin name
845 * @param plugin_addr address
846 * @param plugin_addr_len address length
847 * @param address_active is address actively used
848 * @param atsi ats performance information
849 * @param atsi_count number of ats performance elements
850 * @param bandwidth_out current outbound bandwidth assigned to address
851 * @param bandwidth_in current inbound bandwidth assigned to address
853 typedef void (*GNUNET_ATS_PeerInfo_Iterator) (void *p_it_cls,
854 const struct GNUNET_PeerIdentity *id,
855 const char *plugin_name,
856 const void *plugin_addr,
857 size_t plugin_addr_len,
858 const int address_active,
859 const struct GNUNET_ATS_Information *atsi,
861 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
862 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in);
866 * Return information all peers currently known to ATS
868 * @param handle the address handle to use
869 * @param peer the respective peer
870 * @param pi_it the iterator to call for every peer
871 * @param pi_it_cls the closure for the iterator
874 GAS_addresses_get_peer_info (struct GAS_Addresses_Handle *handle,
875 const struct GNUNET_PeerIdentity *peer,
876 GNUNET_ATS_PeerInfo_Iterator pi_it,
881 /* end of gnunet-service-ats_addresses.h */