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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 Address lifecycle
202 * * (updated address)
205 * 1.8 Bandwidth assignment
207 * The addresses are used to perform resource allocation operations. ATS
208 * addresses takes care of instantiating the solver configured and notifies
209 * the respective solver about address changes and receives changes to the
210 * bandwidth assignment from the solver. The current bandwidth assignment is
211 * sent to transport. The specific solvers will be described in the specific
214 * 1.9 Changing peer preferences
216 * The bandwidth assigned to a peer can be influenced by setting a preference
217 * for a peer. The prefernce will be given to to the solver with s_pref which
218 * has to take care of the preference value
223 * How long will address suggestions blocked after a suggestion
225 #define ATS_BLOCKING_DELTA GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 100)
228 * Information provided by ATS normalization
230 struct GAS_NormalizationInfo
233 * Next index to use in averaging queue
235 unsigned int avg_queue_index;
240 uint32_t atsi_abs[GAS_normalization_queue_length];
243 * Averaged ATSI values from queue
248 * Normalized values from queue to a range of values [1.0...2.0]
255 * Address with additional information
260 * Peer ID this address is for.
262 struct GNUNET_PeerIdentity peer;
265 * Address (in plugin-specific binary format).
275 * Solver specific information for this address
277 void *solver_information;
280 * ATS performance information for this address
282 struct GNUNET_ATS_Information *atsi;
285 * Time when address had last activity (update, in uses)
287 struct GNUNET_TIME_Absolute t_last_activity;
290 * Time when address was added
292 struct GNUNET_TIME_Absolute t_added;
295 * Address length, number of bytes in @e addr.
300 * Session ID, can never be 0.
305 * Field to store local flags
307 uint32_t local_address_info;
310 * ATS performance information for this address, size of the @e atsi array.
315 * Inbound bandwidth assigned by solver
317 uint32_t assigned_bw_in;
320 * Outbound bandwidth assigned by solver
322 uint32_t assigned_bw_out;
325 * Inbound bandwidth assigned by solver in NBO
327 uint32_t last_notified_bw_in;
330 * Outbound bandwidth assigned by solver in NBO
332 uint32_t last_notified_bw_out;
335 * Is this the active address for this peer?
340 * Is this the address for this peer in use?
345 * Normalized ATS performance information for this address
346 * Each entry can be accessed using the GNUNET_ATS_QualityProperties avg_queue_index
348 struct GAS_NormalizationInfo atsin[GNUNET_ATS_QualityPropertiesCount];
353 * A multipeermap mapping peer identities to `struct ATS_Address`.
355 extern struct GNUNET_CONTAINER_MultiPeerMap *GSA_addresses;
360 * Initialize address subsystem. The addresses subsystem manages the addresses
361 * known and current performance information.
364 GAS_addresses_init (void);
368 * Shutdown address subsystem.
371 GAS_addresses_done (void);
375 * Add a new address for a peer.
378 * @param plugin_name transport plugin name
379 * @param plugin_addr plugin address
380 * @param plugin_addr_len length of the plugin address
381 * @param local_address_info the local address for the address
382 * @param session_id session id, can never be 0.
383 * @param atsi performance information for this address
384 * @param atsi_count number of performance information contained in @a atsi
387 GAS_addresses_add (const struct GNUNET_PeerIdentity *peer,
388 const char *plugin_name,
389 const void *plugin_addr,
390 size_t plugin_addr_len,
391 uint32_t local_address_info,
393 const struct GNUNET_ATS_Information *atsi,
394 uint32_t atsi_count);
398 * Update an address with new performance information for a peer.
401 * @param session_id session id, can never be 0
402 * @param atsi performance information for this address
403 * @param atsi_count number of performance information contained in @a atsi
406 GAS_addresses_update (const struct GNUNET_PeerIdentity *peer,
408 const struct GNUNET_ATS_Information *atsi,
409 uint32_t atsi_count);
413 * Remove an address or just a session for a peer.
416 * @param session_id session id, can never be 0
419 GAS_addresses_destroy (const struct GNUNET_PeerIdentity *peer,
420 uint32_t session_id);
424 * Remove all addresses.
427 GAS_addresses_destroy_all (void);
431 * Iterator for #GAS_addresses_get_peer_info()
433 * @param p_it_cls closure closure
434 * @param id the peer id
435 * @param plugin_name plugin name
436 * @param plugin_addr address
437 * @param plugin_addr_len length of @a plugin_addr
438 * @param address_active is address actively used
439 * @param atsi ats performance information
440 * @param atsi_count number of ats performance elements in @a atsi
441 * @param bandwidth_out current outbound bandwidth assigned to address
442 * @param bandwidth_in current inbound bandwidth assigned to address
445 (*GNUNET_ATS_PeerInfo_Iterator) (void *p_it_cls,
446 const struct GNUNET_PeerIdentity *id,
447 const char *plugin_name,
448 const void *plugin_addr,
449 size_t plugin_addr_len,
450 const int address_active,
451 const struct GNUNET_ATS_Information *atsi,
453 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
454 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in);
458 * Return information all peers currently known to ATS
460 * @param peer the respective peer
461 * @param pi_it the iterator to call for every peer
462 * @param pi_it_cls the closure for @a pi_it
465 GAS_addresses_get_peer_info (const struct GNUNET_PeerIdentity *peer,
466 GNUNET_ATS_PeerInfo_Iterator pi_it,
471 /* end of gnunet-service-ats_addresses.h */