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17 * @file ats/gnunet-service-ats_addresses.h
18 * @brief ats service address management
19 * @author Matthias Wachs
20 * @author Christian Grothoff
22 #ifndef GNUNET_SERVICE_ATS_ADDRESSES_H
23 #define GNUNET_SERVICE_ATS_ADDRESSES_H
25 #include "gnunet_util_lib.h"
26 #include "gnunet_ats_service.h"
27 #include "gnunet-service-ats.h"
31 * NOTE: Do not change this documentation. This documentation is based on
32 * gnunet.org:/vcs/fsnsg/ats-paper.git/tech-doku/ats-tech-guide.tex
33 * use build_txt.sh to generate plaintext output
35 * 1 ATS addresses : ATS address management
37 * This ATS addresses ("addresses") component manages the addresses known to
38 * ATS service and suggests addresses to transport service when it is
39 * interested in address suggestion for a peer. ATS addresses also
40 * instantiates the bandwidth assignment mechanism (solver), notifies it
41 * about changes to addresses and forwards changes to bandwidth assignments
42 * to transport, depending if transport is interested in this change.
48 * Addresses are added by specifying peer ID, plugin, address, address length
49 * and session, if available. ATS information can be specified if available.
53 * ATS specifies a fix set of networks an address can belong to. For each
54 * network an inbound and outbound quota will be specified. The available
55 * networks and addtional helper varaibles are defined in
56 * gnunet_ats_service.h. At the moment 5 networks are defined:
57 * * GNUNET_ATS_NET_UNSPECIFIED
58 * * GNUNET_ATS_NET_LOOPBACK
59 * * GNUNET_ATS_NET_LAN
60 * * GNUNET_ATS_NET_WAN
61 * * GNUNET_ATS_NET_WLAN
63 * The total number of networks defined is stored in
64 * GNUNET_ATS_NetworkTypeCount GNUNET_ATS_NetworkType can be used array
65 * initializer for an int array, while GNUNET_ATS_NetworkType is an
66 * initializer for a char array containing a string description of all
71 * An inbound and outbound quota for each of the networks mentioned in 1.1.2
72 * is loaded from ats configuration during initialization. This quota defines
73 * to total amount of inbound and outbound traffic allowed for a specific
74 * network. The configuration values used are in section ats:
75 * * "NETWORK"_QUOTA_IN = <value>
76 * * "NETWORK"_QUOTA_IN = <value>
78 * You can specify quotas by setting the <value> to a:
79 * * unrestricted: unlimited
80 * * number of bytes: e.g. 10240
81 * * fancy value: e.g. 64 Kib
83 * unlimited is defined as GNUNET_ATS_MaxBandwidthString and equivalent to
84 * the value GNUNET_ATS_MaxBandwidth Important predefined values for quotas
86 * * GNUNET_ATS_DefaultBandwidth: 65536
87 * * GNUNET_ATS_MaxBandwidth: UINT32_MAX
88 * * GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT: 1024
90 * Details of loading quotas and default values will be described on
92 * 1.1.4 Preference values
94 * 1.2 Data structures used
96 * Addresse uses struct ATS_Address for each address. The structs are stored
97 * in a linked list and provides a pointer void *solver_information for the
98 * solver to store address specific information. It provides the int values
99 * active which is set to GNUNET_YES if the address is select for transport
100 * use and used, representing that transport service is actively using this
101 * address. Address information are stored in peer, addr, addr_len, plugin.
105 * During initialization a hashmap to store addresses is created. The quotas
106 * for all networks defined for ATS are loaded from configuration. For each
107 * network first the logic will check if the string
108 * GNUNET_ATS_MaxBandwidthString is configured, if not it will try to convert
109 * the configured value as a fancy size and if this fails it will try to use
110 * it as a value_number. If no configuration value is found it will assign
111 * GNUNET_ATS_DefaultBandwidth. The most important step is to load the
112 * configured solver using configuration "[ats]:MODE". Current solvers are
113 * MODE_PROPORTIONAL, MODE_MLP. Interaction is done using a solver API
118 * * s_init: init the solver with required information
119 * * s_add: add a new address
120 * * s_update: update ATS values or session for an address
121 * * s_get: get prefered address for a peer
122 * * s_del: delete an address
123 * * s_pref: change preference value for a peer
124 * * s_done: shutdown solver
126 * Callbacks: addresses provides a bandwidth_changed_cb callback to the
127 * solver which is called when bandwidth assigned to peer has changed
131 * During shutdown all addresses are freed and the solver told to shutdown
133 * 1.6 Addresses and sessions
135 * Addresses consist of the address itself and a numerical session. When a
136 * new address without a session is added it has no session, so it gets
137 * session 0 assigned. When an address with a session is added and an address
138 * object with session 0 is found, this object is updated with the session
139 * otherwise a new address object with this session assigned is created.
143 * Addresses a1,a2 with session s1, s2 are "exact" if:
144 * (a1 == a2)&&(s1 == s2)
145 * Addresses a1,a2 with session s1, s2 are "equivalent" if:
146 * (a1 == a2)&&((s1 == s2)||(s1 == 0)||(s2 == 0)
148 * 1.7 Address management
150 * Transport service notifies ATS about changes to the addresses known to
153 * 1.7.1 Adding an address
155 * When transport learns a new address it tells ATS and ATS is telling
156 * addresses about it using GAS_address_add. If not known to addresses it
157 * creates a new address object and calls solver's s_add. ATS information are
158 * deserialized and solver is notified about the session and ATS information
161 * 1.7.2 Updating an address
163 * Addresses does an lookup up for the existing address with the given
164 * session. If disassembles included ATS information and notifies the solver
165 * using s_update about the update.
167 * 1.7.3 Deleting an address
169 * Addresses does an lookup for the exact address and session and if removes
170 * this address. If session != 0 the session is set to 0 and the address is
171 * kept. If session == 0, the addresses is removed.
173 * 1.7.4 Requesting an address suggestion
175 * The address client issues a request address message to be notified about
176 * address suggestions for a specific peer. Addresses asks the solver with
177 * s_get. If no address is available, it will not send a response, otherwise
178 * it will respond with the choosen address.
180 * 1.7.5 Address suggestions
182 * Addresses will notify the client automatically on any bandwidth_changed_cb
183 * by the solver if a address suggestion request is pending. If no address is
184 * available it will not respond at all If the client is not interested
185 * anymore, it has to cancel the address suggestion request.
187 * 1.7.6 Suggestions blocks and reset
189 * After suggesting an address it is blocked for ATS_BLOCKING_DELTA sec. to
190 * prevent the client from being thrashed. If the client requires immediately
191 * it can reset this block using GAS_addresses_handle_backoff_reset.
193 * 1.7.7 Address lifecycle
196 * * (updated address)
199 * 1.8 Bandwidth assignment
201 * The addresses are used to perform resource allocation operations. ATS
202 * addresses takes care of instantiating the solver configured and notifies
203 * the respective solver about address changes and receives changes to the
204 * bandwidth assignment from the solver. The current bandwidth assignment is
205 * sent to transport. The specific solvers will be described in the specific
208 * 1.9 Changing peer preferences
210 * The bandwidth assigned to a peer can be influenced by setting a preference
211 * for a peer. The prefernce will be given to to the solver with s_pref which
212 * has to take care of the preference value
217 * How long will address suggestions blocked after a suggestion
219 #define ATS_BLOCKING_DELTA GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 100)
222 * Information provided by ATS normalization
224 struct GAS_NormalizationInfo
227 * Next index to use in averaging queue
229 unsigned int avg_queue_index;
234 uint64_t atsi_abs[GAS_normalization_queue_length];
237 * Averaged ATSI values from queue
242 * Normalized values from queue to a range of values [1.0...2.0]
249 * Address with additional information
254 * Peer ID this address is for.
256 struct GNUNET_PeerIdentity peer;
259 * Address (in plugin-specific binary format).
269 * Solver-specific information for this address
271 void *solver_information;
274 * ATS performance information for this address
276 struct GNUNET_ATS_Properties properties;
279 * Time when address had last activity (update, in uses)
281 struct GNUNET_TIME_Absolute t_last_activity;
284 * Time when address was added
286 struct GNUNET_TIME_Absolute t_added;
289 * Address length, number of bytes in @e addr.
294 * Session ID, can never be 0.
299 * Field to store local flags.
301 enum GNUNET_HELLO_AddressInfo local_address_info;
304 * ATS performance information for this address, size of the @e atsi array.
309 * Inbound bandwidth assigned by solver
311 uint32_t assigned_bw_in;
314 * Outbound bandwidth assigned by solver
316 uint32_t assigned_bw_out;
319 * Inbound bandwidth assigned by solver in NBO
321 uint32_t last_notified_bw_in;
324 * Outbound bandwidth assigned by solver in NBO
326 uint32_t last_notified_bw_out;
329 * Is this the active address for this peer?
334 * Normalized delay information for this address.
336 struct GAS_NormalizationInfo norm_delay;
339 * Normalized distance information for this address.
341 struct GAS_NormalizationInfo norm_distance;
344 * Normalized utilization inbound for this address.
346 struct GAS_NormalizationInfo norm_utilization_in;
349 * Normalized utilization outbound for this address.
351 struct GAS_NormalizationInfo norm_utilization_out;
357 * A multipeermap mapping peer identities to `struct ATS_Address`.
359 extern struct GNUNET_CONTAINER_MultiPeerMap *GSA_addresses;
363 * Initialize address subsystem. The addresses subsystem manages the addresses
364 * known and current performance information.
367 GAS_addresses_init (void);
371 * Shutdown address subsystem.
374 GAS_addresses_done (void);
378 * Add a new address for a peer.
381 * @param plugin_name transport plugin name
382 * @param plugin_addr plugin address
383 * @param plugin_addr_len length of the @a plugin_addr
384 * @param local_address_info the local address for the address
385 * @param session_id session id, can never be 0.
386 * @param prop performance information for this address
389 GAS_addresses_add (const struct GNUNET_PeerIdentity *peer,
390 const char *plugin_name,
391 const void *plugin_addr,
392 size_t plugin_addr_len,
393 uint32_t local_address_info,
395 const struct GNUNET_ATS_Properties *prop);
399 * Update an address with new performance information for a peer.
402 * @param session_id session id, can never be 0
403 * @param prop performance information for this address
406 GAS_addresses_update (const struct GNUNET_PeerIdentity *peer,
408 const struct GNUNET_ATS_Properties *prop);
412 * Remove an address for a peer.
415 * @param session_id session id, can never be 0
418 GAS_addresses_destroy (const struct GNUNET_PeerIdentity *peer,
419 uint32_t session_id);
423 * Remove all addresses.
426 GAS_addresses_destroy_all (void);
430 * Iterator for #GAS_addresses_get_peer_info()
433 * @param id the peer id
434 * @param plugin_name plugin name
435 * @param plugin_addr address
436 * @param plugin_addr_len length of @a plugin_addr
437 * @param address_active is address actively used
438 * @param atsi ats performance information
439 * @param local_address_info flags for the address
440 * @param bandwidth_out current outbound bandwidth assigned to address
441 * @param bandwidth_in current inbound bandwidth assigned to address
444 (*GNUNET_ATS_PeerInfo_Iterator) (void *cls,
445 const struct GNUNET_PeerIdentity *id,
446 const char *plugin_name,
447 const void *plugin_addr,
448 size_t plugin_addr_len,
449 const int address_active,
450 const struct GNUNET_ATS_Properties *prop,
451 enum GNUNET_HELLO_AddressInfo local_address_info,
452 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
453 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in);
457 * Return information all peers currently known to ATS
459 * @param peer the respective peer
460 * @param pi_it the iterator to call for every peer
461 * @param pi_it_cls the closure for @a pi_it
464 GAS_addresses_get_peer_info (const struct GNUNET_PeerIdentity *peer,
465 GNUNET_ATS_PeerInfo_Iterator pi_it,
470 * Handle 'address list request' messages from clients.
472 * @param client client that sent the request
473 * @param alrm the request message
476 GAS_handle_request_address_list (struct GNUNET_SERVICE_Client *client,
477 const struct AddressListRequestMessage *alrm);
482 /* end of gnunet-service-ats_addresses.h */