/* This file is part of GNUnet. (C) 2010,2011 Christian Grothoff (and other contributing authors) GNUnet is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, 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 General Public License for more details. You should have received a copy of the GNU General Public License along with GNUnet; see the file COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /** * @file include/gnunet_ats_service.h * @brief automatic transport selection and outbound bandwidth determination * @author Christian Grothoff * @author Matthias Wachs */ #ifndef GNUNET_ATS_SERVICE_H #define GNUNET_ATS_SERVICE_H #include "gnunet_constants.h" #include "gnunet_util_lib.h" #include "gnunet_hello_lib.h" /** * Enum defining all known property types for ATS Enum values are used * in the GNUNET_ATS_Information struct as * (key,value)-pairs. * * Cost are always stored in uint32_t, so all units used to define costs * have to be normalized to fit in uint32_t [0 .. 4.294.967.295] */ enum GNUNET_ATS_Property { /** * End of the array. * @deprecated */ GNUNET_ATS_ARRAY_TERMINATOR = 0, /** * Actual traffic on this connection from the other peer to this peer. * * Unit: [bytes/second] */ GNUNET_ATS_UTILIZATION_UP, /** * Actual traffic on this connection from this peer to the other peer. * * Unit: [bytes/second] */ GNUNET_ATS_UTILIZATION_DOWN, /** * Delay * Time between when the time packet is sent and the packet arrives * * Unit: [ms] * * Examples: * * LAN : 1 * WLAN : 2 * Dialup: 500 */ GNUNET_ATS_QUALITY_NET_DELAY, /** * Distance on network layer (required for distance-vector routing). * * Unit: [DV-hops] */ GNUNET_ATS_QUALITY_NET_DISTANCE, /** * Network overhead on WAN (Wide-Area Network) * * How many bytes are sent on the WAN when 1 kilobyte (1024 bytes) * of application data is transmitted? * A factor used with connect cost, bandwidth cost and energy cost * to describe the overhead produced by the transport protocol * * Unit: [bytes/kb] * * Interpretation: less is better * * Examples: * * TCP/IPv4 over Ethernet: 1024 + 38 + 20 + 20 = 1102 [bytes/kb] * TCP/IPv6 over Ethernet: 1024 + 38 + 20 + 40 = 1122 [bytes/kb] * UDP/IPv4 over Ethernet: 1024 + 38 + 20 + 8 = 1090 [bytes/kb] * UDP/IPv6 over Ethernet: 1024 + 38 + 40 + 8 = 1110 [bytes/kb] */ GNUNET_ATS_COST_WAN, /** * Network overhead on LAN (Local-Area Network) * * How many bytes are sent on the LAN when 1 kilobyte (1024 bytes) * of application data is transmitted? * A factor used with connect cost, bandwidth cost and energy cost * to describe the overhead produced by the transport protocol * * Unit: [bytes/kb] * * Interpretation: less is better * * Examples: * * TCP/IPv4 over Ethernet: 1024 + 38 + 20 + 20 = 1102 [bytes/kb] * TCP/IPv6 over Ethernet: 1024 + 38 + 20 + 40 = 1122 [bytes/kb] * UDP/IPv4 over Ethernet: 1024 + 38 + 20 + 8 = 1090 [bytes/kb] * UDP/IPv6 over Ethernet: 1024 + 38 + 40 + 8 = 1110 [bytes/kb] */ GNUNET_ATS_COST_LAN, /** * Network overhead on WLAN (Wireless Local Area Network) * * How many bytes are sent on the LAN when 1 kilobyte (1024 bytes) * of application data is transmitted? * A factor used with connect cost, bandwidth cost and energy cost * to describe the overhead produced by the transport protocol * * Unit: [bytes/kb] * * Interpretation: less is better * * Examples: * * TCP/IPv4 over Ethernet: 1024 + 38 + 20 + 20 = 1102 [bytes/kb] * TCP/IPv6 over Ethernet: 1024 + 38 + 20 + 40 = 1122 [bytes/kb] * UDP/IPv4 over Ethernet: 1024 + 38 + 20 + 8 = 1090 [bytes/kb] * UDP/IPv6 over Ethernet: 1024 + 38 + 40 + 8 = 1110 [bytes/kb] */ GNUNET_ATS_COST_WLAN /* Cost related values */ /* =================== */ /** * Volume based cost in financial units to transmit data * * Note: This value is not bound to a specific currency or unit and only * used locally. * "cent" just refers the smallest amount of money in the respective * currency. * * Unit: [cent/MB] * * Interpretation: less is better * * Examples: * LAN: 0 [cent/MB] * 2G : 10 [cent/MB] */ // GNUNET_ATS_COST_FINANCIAL_PER_VOLUME = 1, /** * Time based cost in financial units to transmit data * * Note: This value is not bound to a specific currency or unit and only * used locally. * "cent" just refers the smallest amount of money in the respective * currency. * * Unit: [cent/h] * * Interpretation: less is better * * Examples: * LAN : 0 [cent/h] * Dialup: 10 [cent/h] */ // GNUNET_ATS_COST_FINANCIAL_PER_TIME = 2, /** * Computational costs * * Effort of preparing data to be sent with this transport * Includes encoding, encryption and conversion of data * Partial values can be summed up: c_sum = c_enc + c_enc + c_conv * Resulting values depend on local system properties, e.g. CPU * * Unit: [ms/GB] * * Interpretation: less is better * * Examples: * * HTTPS with AES CBC-256: 7,382 * HTTPS with AES CBC-128: 5,279 * HTTPS with RC4-1024: 2,652 */ // GNUNET_ATS_COST_COMPUTATIONAL = 3, /** * Energy consumption * * Energy consumption using this transport when sending with a certain * power at a certain bitrate. This is only an approximation based on: * Energy consumption E = P / D * * with: * Power P in Watt (J/s) * Datarate D in MBit/s * * Conversion between power P and dBm used by WLAN in radiotap's dBm TX power: * * Lp(dbm) = 10 log10 (P/ 1mW) * * => P = 1 mW * 10^(Lp(dbm)/10) * * Unit: [mJ/MB] * * Interpretation: less is better * * Examples: * * LAN: 0 * WLAN: 89 (600 mW @ 802.11g /w 54 MBit/s) * Bluetooth: 267 (100 mW @ BT2.0 EDR /w 3 MBit/s) */ // GNUNET_ATS_COST_ENERGY_CONSUMPTION = 4, /** * Connect cost * How many bytes are transmitted to initiate a new connection using * this transport? * * Unit: [bytes] * * Interpretation: less is better * * Examples: * * UDP (No connection) : * 0 bytes * TCP (TCP 3-Way handshake): * 220 bytes Ethernet, 172 bytes TCP/IP, 122 bytes TCP * HTTP (TCP + Header) : * 477 bytes Ethernet, 429 bytes TCP/IP, 374 bytes TCP, 278 bytes HTTP * HTTPS HTTP+TLS Handshake: * 2129 bytes Ethernet, 1975 bytes TCP/IP, 1755 bytes TCP, 1403 bytes HTTPS * * */ // GNUNET_ATS_COST_CONNECT = 5, /** * Bandwidth cost * * How many bandwidth is available to consume? * Used to calculate which impact sending data with this transport has * * Unit: [kB/s] * * Interpretation: more is better * * Examples: * LAN: 12,800 (100 MBit/s) * WLAN: 6,912 (54 MBit/s) * Dial-up: 8 (64 Kbit/s) * */ // GNUNET_ATS_COST_BANDWITH_AVAILABLE = 6, /** * Network overhead * * How many bytes are sent over the wire when 1 kilobyte (1024 bytes) * of application data is transmitted? * A factor used with connect cost, bandwidth cost and energy cost * to describe the overhead produced by the transport protocol * * Unit: [bytes/kb] * * Interpretation: less is better * * Examples: * * TCP/IPv4 over Ethernet: 1024 + 38 + 20 + 20 = 1102 [bytes/kb] * TCP/IPv6 over Ethernet: 1024 + 38 + 20 + 40 = 1122 [bytes/kb] * UDP/IPv4 over Ethernet: 1024 + 38 + 20 + 8 = 1090 [bytes/kb] * UDP/IPv6 over Ethernet: 1024 + 38 + 40 + 8 = 1110 [bytes/kb] */ // GNUNET_ATS_COST_NETWORK_OVERHEAD = 7, /* Quality related values */ /* ====================== */ /* Physical layer quality properties */ /** * Signal strength on physical layer * * Unit: [dBm] */ // GNUNET_ATS_QUALITY_PHY_SIGNAL_STRENGTH = 1025, /** * Collision rate on physical layer * * Unit: [B/s] */ // GNUNET_ATS_QUALITY_PHY_COLLISION_RATE = 1026, /** * Error rate on physical layer * * Unit: [B/s] */ // GNUNET_ATS_QUALITY_PHY_ERROR_RATE = 1027, /** * Jitter * Time variations of the delay * 1st derivative of a delay function * * Unit: [ms] */ // GNUNET_ATS_QUALITY_NET_JITTER = 1029, /** * Error rate on network layer * * Unit: [B/s] * * Examples: * * LAN : 0 * WLAN : 400 * Bluetooth : 100 * Note: This numbers are just assumptions as an example, not * measured or somehow determined */ // GNUNET_ATS_QUALITY_NET_ERRORRATE = 1030, /** * Drop rate on network layer * Bytes actively dismissed by a network component during transmission * Reasons for dropped data can be full queues, congestion, quota violations... * * Unit: [B/s] * * Examples: * * LAN : 0 * WLAN : 400 * Bluetooth : 100 * Note: This numbers are just assumptions as an example, not * measured or somehow determined */ // GNUNET_ATS_QUALITY_NET_DROPRATE = 1031, /** * Loss rate on network layer * Bytes lost during transmission * Reasons can be collisions, ... * * Unit: [B/s] * * Examples: * * LAN : 0 * WLAN : 40 * Bluetooth : 10 * Note: This numbers are just assumptions as an example, not measured * or somehow determined */ // GNUNET_ATS_QUALITY_NET_LOSSRATE = 1032, /** * Throughput on network layer * * Unit: [kB/s] * * Examples: * * LAN : 3400 * WLAN : 1200 * Dialup: 4 * */ // GNUNET_ATS_QUALITY_NET_THROUGHPUT = 1033, /* Availability related values */ /* =========================== */ /** * Is a peer reachable? */ // GNUNET_ATS_AVAILABILITY_REACHABLE = 2048, /** * Is there a connection established to a peer using this transport */ // GNUNET_ATS_AVAILABILITY_CONNECTED = 2049 }; /** * struct used to communicate the transport's properties like cost and * quality of service as well as high-level constraints on resource * consumption. * * +---+ * +-----------+ Constraints | | Plugin properties +---------+ * | Highlevel |------------> |ATS| <------------------|Transport| * | Component | ATS struct | | ATS struct | Plugin | * +-----------+ | | +---------+ * +---+ * * This structure will be used by transport plugins to communicate * costs to ATS or by higher level components to tell ATS their * constraints. Always a pair of (GNUNET_ATS_Property, * uint32_t value). Value is always uint32_t, so all units used to * define costs have to be normalized to fit uint32_t. */ struct GNUNET_ATS_Information { /** * ATS property type, in network byte order. */ uint32_t type GNUNET_PACKED; /** * ATS property value, in network byte order. */ uint32_t value GNUNET_PACKED; }; /* ******************************** 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 Session; /** * Signature of a function called by ATS with the current bandwidth * and address preferences as determined by ATS. * * @param cls closure * @param address suggested address (including peer identity of the peer) * @param session session to use * @param bandwidth_out assigned outbound bandwidth for the connection * @param bandwidth_in assigned inbound bandwidth for the connection * @param ats performance data for the address (as far as known) * @param ats_count number of performance records in 'ats' */ typedef void (*GNUNET_ATS_AddressSuggestionCallback) (void *cls, const struct GNUNET_HELLO_Address *address, struct Session * session, struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out, struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in, const struct GNUNET_ATS_Information * ats, uint32_t ats_count); /** * Initialize the ATS subsystem. * * @param cfg configuration to use * @param suggest_cb notification to call whenever the suggestation changed * @param suggest_cb_cls closure for '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); /** * We would like to establish a new connection with a peer. ATS * should suggest a good address to begin with. * * @param sh handle * @param peer identity of the peer we need an address for */ void GNUNET_ATS_suggest_address (struct GNUNET_ATS_SchedulingHandle *sh, const struct GNUNET_PeerIdentity *peer); /** * We want to cancel ATS suggesting addresses for a peer. * * @param sh handle * @param peer identity of the peer */ void GNUNET_ATS_suggest_address_cancel (struct GNUNET_ATS_SchedulingHandle *sh, const struct GNUNET_PeerIdentity *peer); /** * 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 (in * which case the call may be ignored or the information may be stored * for later use). Update bandwidth assignments. * * @param sh handle * @param address updated address * @param session session handle (if available) * @param ats performance data for the address * @param ats_count number of performance records in 'ats' */ void GNUNET_ATS_address_update (struct GNUNET_ATS_SchedulingHandle *sh, const struct GNUNET_HELLO_Address *address, struct Session *session, const struct GNUNET_ATS_Information *ats, uint32_t ats_count); /** * An address is now in use or not used any more. * * @param sh handle * @param address the address * @param session session handle * @param in_use GNUNET_YES if this address is now used, GNUNET_NO * if address is not used any more */ void GNUNET_ATS_address_in_use (struct GNUNET_ATS_SchedulingHandle *sh, const struct GNUNET_HELLO_Address *address, struct Session *session, int in_use); /** * A session got destroyed, stop including it as a valid address. * * @param sh handle * @param address the address * @param session session handle that is no longer valid (if available) */ void GNUNET_ATS_address_destroyed (struct GNUNET_ATS_SchedulingHandle *sh, const struct GNUNET_HELLO_Address *address, struct Session *session); /* ******************************** 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 a peer. * * @param cls closure * @param address the address * @param bandwidth_out assigned outbound bandwidth for the connection * @param bandwidth_in assigned inbound bandwidth for the connection * @param ats performance data for the address (as far as known) * @param ats_count number of performance records in 'ats' */ typedef void (*GNUNET_ATS_PeerInformationCallback) (void *cls, const struct GNUNET_HELLO_Address *address, struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out, struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in, const struct GNUNET_ATS_Information * ats, uint32_t ats_count); /** * Get handle to access performance API of the ATS subsystem. * * @param cfg configuration to use * @param infocb function to call on performance changes, can be NULL * @param infocb_cls closure for infocb * @return ats performance context */ struct GNUNET_ATS_PerformanceHandle * GNUNET_ATS_performance_init (const struct GNUNET_CONFIGURATION_Handle *cfg, GNUNET_ATS_PeerInformationCallback infocb, void *infocb_cls); /** * 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 info * @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); /** * Enum defining all known preference categories. */ enum GNUNET_ATS_PreferenceKind { /** * End of preference list. */ GNUNET_ATS_PREFERENCE_END = 0, /** * 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, /** * 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 ms (minimum: 1 ms) multiplied by * the latency preferences. */ GNUNET_ATS_PREFERENCE_LATENCY }; /** * Change preferences for the given peer. Preference changes are forgotten if peers * disconnect. * * @param ph performance handle * @param peer identifies the peer * @param ... 0-terminated specification of the desired changes */ void GNUNET_ATS_change_preference (struct GNUNET_ATS_PerformanceHandle *ph, const struct GNUNET_PeerIdentity *peer, ...); #endif /* end of file gnunet-service-transport_ats.h */