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- /*
- This file is part of GNUnet.
- Copyright (C) 2010-2015 GNUnet e.V.
- GNUnet is free software: you can redistribute it and/or modify it
- under the terms of the GNU Affero General Public License as published
- by the Free Software Foundation, either version 3 of the License,
- or (at your option) any later version.
- GNUnet is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Affero General Public License for more details.
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @file
- * Automatic transport selection and outbound bandwidth determination
- *
- * @author Christian Grothoff
- * @author Matthias Wachs
- *
- * @defgroup ats ATS service
- * Automatic Transport Selection and outbound bandwidth determination
- *
- * @see [Documentation](https://gnunet.org/ats-subsystem)
- *
- * @{
- */
- #ifndef GNUNET_ATS_SERVICE_H
- #define GNUNET_ATS_SERVICE_H
- #include "gnunet_constants.h"
- #include "gnunet_util_lib.h"
- #include "gnunet_hello_lib.h"
- /**
- * Default bandwidth assigned to a network : 64 KB/s
- */
- #define GNUNET_ATS_DefaultBandwidth 65536
- /**
- * Undefined value for an `enum GNUNET_ATS_Property`
- */
- #define GNUNET_ATS_VALUE_UNDEFINED UINT32_MAX
- /**
- * String representation for GNUNET_ATS_VALUE_UNDEFINED
- */
- #define GNUNET_ATS_VALUE_UNDEFINED_STR "undefined"
- /**
- * Maximum bandwidth assigned to a network : 4095 MB/s
- */
- #define GNUNET_ATS_MaxBandwidth UINT32_MAX
- /**
- * Textual equivalent for GNUNET_ATS_MaxBandwidth
- */
- #define GNUNET_ATS_MaxBandwidthString "unlimited"
- /**
- * ATS performance characteristics for an address.
- */
- struct GNUNET_ATS_Properties
- {
- /**
- * Delay. Time between when the time packet is sent and the packet
- * arrives. FOREVER if we did not measure yet.
- */
- struct GNUNET_TIME_Relative delay;
- /**
- * Actual traffic on this connection from this peer to the other peer.
- * Includes transport overhead.
- *
- * Unit: [bytes/second]
- */
- uint32_t utilization_out;
- /**
- * Actual traffic on this connection from the other peer to this peer.
- * Includes transport overhead.
- *
- * Unit: [bytes/second]
- */
- uint32_t utilization_in;
- /**
- * Distance on network layer (required for distance-vector routing)
- * in hops. Zero for direct connections (i.e. plain TCP/UDP).
- */
- unsigned int distance;
- /**
- * Which network scope does the respective address belong to?
- * This property does not change.
- */
- enum GNUNET_NetworkType scope;
- };
- /**
- * ATS performance characteristics for an address in
- * network byte order (for IPC).
- */
- struct GNUNET_ATS_PropertiesNBO
- {
- /**
- * Actual traffic on this connection from this peer to the other peer.
- * Includes transport overhead.
- *
- * Unit: [bytes/second]
- */
- uint32_t utilization_out GNUNET_PACKED;
- /**
- * Actual traffic on this connection from the other peer to this peer.
- * Includes transport overhead.
- *
- * Unit: [bytes/second]
- */
- uint32_t utilization_in GNUNET_PACKED;
- /**
- * Which network scope does the respective address belong to?
- * This property does not change.
- */
- uint32_t scope GNUNET_PACKED;
- /**
- * Distance on network layer (required for distance-vector routing)
- * in hops. Zero for direct connections (i.e. plain TCP/UDP).
- */
- uint32_t distance GNUNET_PACKED;
- /**
- * Delay. Time between when the time packet is sent and the packet
- * arrives. FOREVER if we did not measure yet.
- */
- struct GNUNET_TIME_RelativeNBO delay;
- };
- /* ********************* LAN Characterization library ************************ */
- /* Note: these functions do not really communicate with the ATS service */
- /**
- * Convert ATS properties from host to network byte order.
- *
- * @param nbo[OUT] value written
- * @param hbo value read
- */
- void
- GNUNET_ATS_properties_hton (struct GNUNET_ATS_PropertiesNBO *nbo,
- const struct GNUNET_ATS_Properties *hbo);
- /**
- * Convert ATS properties from network to host byte order.
- *
- * @param hbo[OUT] value written
- * @param nbo value read
- */
- void
- GNUNET_ATS_properties_ntoh (struct GNUNET_ATS_Properties *hbo,
- const struct GNUNET_ATS_PropertiesNBO *nbo);
- /* ********************Connection Suggestion API ***************************** */
- /**
- * Handle to the ATS subsystem for making suggestions about
- * connections the peer would like to have.
- */
- struct GNUNET_ATS_ConnectivityHandle;
- /**
- * Handle for address suggestion requests.
- */
- struct GNUNET_ATS_ConnectivitySuggestHandle;
- /**
- * Initialize the ATS connectivity suggestion client handle.
- *
- * @param cfg configuration to use
- * @return ats connectivity handle, NULL on error
- */
- struct GNUNET_ATS_ConnectivityHandle *
- GNUNET_ATS_connectivity_init (const struct GNUNET_CONFIGURATION_Handle *cfg);
- /**
- * Shutdown ATS connectivity suggestion client.
- *
- * @param ch handle to destroy
- */
- void
- GNUNET_ATS_connectivity_done (struct GNUNET_ATS_ConnectivityHandle *ch);
- /**
- * We would like to establish a new connection with a peer. ATS
- * should suggest a good address to begin with.
- *
- * @param ch handle
- * @param peer identity of the peer we need an address for
- * @param strength how urgent is the need for such a suggestion
- * @return suggestion handle, NULL if request is already pending
- */
- struct GNUNET_ATS_ConnectivitySuggestHandle *
- GNUNET_ATS_connectivity_suggest (struct GNUNET_ATS_ConnectivityHandle *ch,
- const struct GNUNET_PeerIdentity *peer,
- uint32_t strength);
- /**
- * We no longer care about being connected to a peer.
- *
- * @param sh handle
- */
- void
- GNUNET_ATS_connectivity_suggest_cancel (struct GNUNET_ATS_ConnectivitySuggestHandle *sh);
- /* ******************************** Scheduling API ***************************** */
- /**
- * Handle to the ATS subsystem for bandwidth/transport scheduling information.
- */
- struct GNUNET_ATS_SchedulingHandle;
- /**
- * Opaque session handle, defined by plugins. Contents not known to ATS.
- */
- struct GNUNET_ATS_Session;
- /**
- * Signature of a function called by ATS with the current bandwidth
- * and address preferences as determined by ATS. If our connection
- * to ATS dies and thus all suggestions become invalid, this function
- * is called ONCE with all arguments (except @a cls) being NULL/0.
- *
- * @param cls closure
- * @param peer for which we suggest an address, NULL if ATS connection died
- * @param address suggested address (including peer identity of the peer),
- * may be NULL to signal disconnect from peer
- * @param session session to use, NULL to establish a new outgoing session
- * @param bandwidth_out assigned outbound bandwidth for the connection,
- * 0 to signal disconnect
- * @param bandwidth_in assigned inbound bandwidth for the connection,
- * 0 to signal disconnect
- */
- typedef void
- (*GNUNET_ATS_AddressSuggestionCallback) (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_HELLO_Address *address,
- struct GNUNET_ATS_Session *session,
- struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
- struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in);
- /**
- * Initialize the ATS scheduling subsystem.
- *
- * @param cfg configuration to use
- * @param suggest_cb notification to call whenever the suggestation changed
- * @param suggest_cb_cls closure for @a suggest_cb
- * @return ats context
- */
- struct GNUNET_ATS_SchedulingHandle *
- GNUNET_ATS_scheduling_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
- GNUNET_ATS_AddressSuggestionCallback suggest_cb,
- void *suggest_cb_cls);
- /**
- * Client is done with ATS scheduling, release resources.
- *
- * @param sh handle to release
- */
- void
- GNUNET_ATS_scheduling_done (struct GNUNET_ATS_SchedulingHandle *sh);
- /**
- * Handle used within ATS to track an address.
- */
- struct GNUNET_ATS_AddressRecord;
- /**
- * We have a new address ATS should know. Addresses have to be added with this
- * function before they can be: updated, set in use and destroyed
- *
- * @param sh handle
- * @param address the address
- * @param session session handle (if available, i.e. for incoming connections)
- * @param prop performance data for the address
- * @return handle to the address representation inside ATS, NULL
- * on error (i.e. ATS knows this exact address already, or
- * address is invalid)
- */
- struct GNUNET_ATS_AddressRecord *
- GNUNET_ATS_address_add (struct GNUNET_ATS_SchedulingHandle *sh,
- const struct GNUNET_HELLO_Address *address,
- struct GNUNET_ATS_Session *session,
- const struct GNUNET_ATS_Properties *prop);
- /**
- * An address was used to initiate a session.
- *
- * @param ar address record to update information for
- * @param session session handle
- */
- void
- GNUNET_ATS_address_add_session (struct GNUNET_ATS_AddressRecord *ar,
- struct GNUNET_ATS_Session *session);
- /**
- * A @a session was destroyed, disassociate it from the given address
- * record. If this was an incoming addess, destroys the address as
- * well.
- *
- * @param ar address record to update information for
- * @param session session handle
- * @return #GNUNET_YES if the @a ar was destroyed because
- * it was an incoming address,
- * #GNUNET_NO if the @ar was kept because we can
- * use it still to establish a new session
- */
- int
- GNUNET_ATS_address_del_session (struct GNUNET_ATS_AddressRecord *ar,
- struct GNUNET_ATS_Session *session);
- /**
- * We have updated performance statistics for a given address. Note
- * that this function can be called for addresses that are currently
- * in use as well as addresses that are valid but not actively in use.
- * Furthermore, the peer may not even be connected to us right now (@a
- * session value of NULL used to signal disconnect, or somehow we
- * otherwise got updated on @a ats information). Based on the
- * information provided, ATS may update bandwidth assignments and
- * suggest to switch addresses.
- *
- * @param ar address record to update information for
- * @param prop performance data for the address
- */
- void
- GNUNET_ATS_address_update (struct GNUNET_ATS_AddressRecord *ar,
- const struct GNUNET_ATS_Properties *prop);
- /**
- * An address got destroyed, stop using it as a valid address.
- *
- * @param ar address record to destroy, it's validation has
- * expired and ATS may no longer use it
- */
- void
- GNUNET_ATS_address_destroy (struct GNUNET_ATS_AddressRecord *ar);
- /* ******************************** Performance API ***************************** */
- /**
- * ATS Handle to obtain and/or modify performance information.
- */
- struct GNUNET_ATS_PerformanceHandle;
- /**
- * Signature of a function that is called with QoS information about an address.
- *
- * @param cls closure
- * @param address the address, NULL if ATS service was disconnected or
- * when the iteration is completed in the case of
- * #GNUNET_ATS_performance_list_addresses()
- * @param address_active #GNUNET_YES if this address is actively used
- * to maintain a connection to a peer;
- * #GNUNET_NO if the address is not actively used;
- * #GNUNET_SYSERR if this address is no longer available for ATS
- * @param bandwidth_out assigned outbound bandwidth for the connection
- * @param bandwidth_in assigned inbound bandwidth for the connection
- * @param prop performance data for the address
- */
- typedef void
- (*GNUNET_ATS_AddressInformationCallback) (void *cls,
- const struct GNUNET_HELLO_Address *address,
- int address_active,
- struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
- struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
- const struct GNUNET_ATS_Properties *prop);
- /**
- * Handle for an address listing operation
- */
- struct GNUNET_ATS_AddressListHandle;
- /**
- * Get handle to access performance API of the ATS subsystem.
- *
- * @param cfg configuration to use
- * @param addr_info_cb callback called when performance characteristics for
- * an address change
- * @param addr_info_cb_cls closure for @a addr_info_cb
- * @return ats performance context
- */
- struct GNUNET_ATS_PerformanceHandle *
- GNUNET_ATS_performance_init (const struct GNUNET_CONFIGURATION_Handle *cfg,
- GNUNET_ATS_AddressInformationCallback addr_info_cb,
- void *addr_info_cb_cls);
- /**
- * Get information about addresses known to the ATS subsystem.
- *
- * @param ph the performance handle to use
- * @param peer peer idm can be NULL for all peers
- * @param all #GNUNET_YES to get information about all addresses or #GNUNET_NO to
- * get only address currently used
- * @param infocb callback to call with the addresses,
- * will callback with address == NULL when done
- * @param infocb_cls closure for @a infocb
- * @return handle to abort the operation
- */
- struct GNUNET_ATS_AddressListHandle *
- GNUNET_ATS_performance_list_addresses (struct GNUNET_ATS_PerformanceHandle *ph,
- const struct GNUNET_PeerIdentity *peer,
- int all,
- GNUNET_ATS_AddressInformationCallback infocb,
- void *infocb_cls);
- /**
- * Cancel a pending address listing operation
- *
- * @param alh the `struct GNUNET_ATS_AddressListHandle` handle to cancel
- */
- void
- GNUNET_ATS_performance_list_addresses_cancel (struct GNUNET_ATS_AddressListHandle *alh);
- /**
- * Client is done using the ATS performance subsystem, release resources.
- *
- * @param ph handle
- */
- void
- GNUNET_ATS_performance_done (struct GNUNET_ATS_PerformanceHandle *ph);
- /**
- * Function called with reservation result.
- *
- * @param cls closure
- * @param peer identifies the peer
- * @param amount set to the amount that was actually reserved or unreserved;
- * either the full requested amount or zero (no partial reservations)
- * @param res_delay if the reservation could not be satisfied (amount was 0), how
- * long should the client wait until re-trying?
- */
- typedef void
- (*GNUNET_ATS_ReservationCallback) (void *cls,
- const struct GNUNET_PeerIdentity *peer,
- int32_t amount,
- struct GNUNET_TIME_Relative res_delay);
- /**
- * Context that can be used to cancel a peer information request.
- */
- struct GNUNET_ATS_ReservationContext;
- /**
- * Reserve inbound bandwidth from the given peer. ATS will look at
- * the current amount of traffic we receive from the peer and ensure
- * that the peer could add 'amount' of data to its stream.
- *
- * @param ph performance handle
- * @param peer identifies the peer
- * @param amount reserve N bytes for receiving, negative
- * amounts can be used to undo a (recent) reservation;
- * @param rcb function to call with the resulting reservation information
- * @param rcb_cls closure for @a rcb
- * @return NULL on error
- * @deprecated will be replaced soon
- */
- struct GNUNET_ATS_ReservationContext *
- GNUNET_ATS_reserve_bandwidth (struct GNUNET_ATS_PerformanceHandle *ph,
- const struct GNUNET_PeerIdentity *peer,
- int32_t amount,
- GNUNET_ATS_ReservationCallback rcb,
- void *rcb_cls);
- /**
- * Cancel request for reserving bandwidth.
- *
- * @param rc context returned by the original GNUNET_ATS_reserve_bandwidth call
- */
- void
- GNUNET_ATS_reserve_bandwidth_cancel (struct GNUNET_ATS_ReservationContext *rc);
- /**
- * ATS preference types as array initializer
- */
- #define GNUNET_ATS_PreferenceType {GNUNET_ATS_PREFERENCE_BANDWIDTH, GNUNET_ATS_PREFERENCE_LATENCY, GNUNET_ATS_PREFERENCE_END}
- /**
- * ATS preference types as string array initializer
- */
- #define GNUNET_ATS_PreferenceTypeString {"BANDWIDTH", "LATENCY", "END" }
- /**
- * Enum defining all known preference categories.
- */
- enum GNUNET_ATS_PreferenceKind
- {
- /**
- * Change the peer's bandwidth value (value per byte of bandwidth in
- * the goal function) to the given amount. The argument is followed
- * by a double value giving the desired value (can be negative).
- * Preference changes are forgotten if peers disconnect.
- */
- GNUNET_ATS_PREFERENCE_BANDWIDTH = 0,
- /**
- * Change the peer's latency value to the given amount. The
- * argument is followed by a double value giving the desired value
- * (can be negative). The absolute score in the goal function is
- * the inverse of the latency in microseconds (minimum: 1
- * microsecond) multiplied by the latency preferences.
- */
- GNUNET_ATS_PREFERENCE_LATENCY = 1,
- /**
- * End of preference list.
- */
- GNUNET_ATS_PREFERENCE_END = 2
- };
- /**
- * Convert a GNUNET_ATS_PreferenceType to a string
- *
- * @param type the preference type
- * @return a string or NULL if invalid
- */
- const char *
- GNUNET_ATS_print_preference_type (enum GNUNET_ATS_PreferenceKind type);
- /**
- * Change preferences for the given peer. Preference changes are forgotten if peers
- * disconnect.
- *
- * @param ph performance handle @param peer identifies the peer
- * @param ... #GNUNET_ATS_PREFERENCE_END-terminated specification of the
- * desired changes
- */
- void
- GNUNET_ATS_performance_change_preference (struct GNUNET_ATS_PerformanceHandle *ph,
- const struct GNUNET_PeerIdentity *peer,
- ...);
- /**
- * Application feedback on how good preference requirements are fulfilled
- * for the preferences included in the given time scope [now - scope .. now]
- *
- * An application notifies ATS if (and only if) it has feedback information
- * for specific properties. This values are valid until the feedback scores are
- * updated by the application.
- *
- * If the application has no feedback for this preference kind the application
- * will not explicitly call for this property and will not include it in this
- * function call.
- *
- * @param ph performance handle
- * @param scope the time interval this valid for: [now - scope .. now]
- * @param peer identifies the peer
- * @param ... #GNUNET_ATS_PREFERENCE_END-terminated specification of the desired changes
- */
- void
- GNUNET_ATS_performance_give_feedback (struct GNUNET_ATS_PerformanceHandle *ph,
- const struct GNUNET_PeerIdentity *peer,
- const struct GNUNET_TIME_Relative scope,
- ...);
- #endif
- /** @} */ /* end of group */
- /* end of file gnunet-service-transport_ats.h */
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