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3 (C) 2009 Christian Grothoff (and other contributing authors)
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22 * @file transport/transport_selection.h
23 * @brief structure definition for automatic transport selection (ATS)
24 * @author Matthias Wachs
28 * The structs defined here are used by the transport plugin to tell ATS about the transport's properties like cost and quality
29 * and on the other side the structs are used by highlevel components to communicate the constraints they have for a transport to ATS
32 * +-----------+ Constraints | | Plugin properties +---------+
33 * | Highlevel |------------> |ATS| <------------------|Transport|
34 * | Component | ATS struct | | ATS struct | Plugin |
35 * +-----------+ | | +---------+
40 #define GNUNET_ATS_ARRAY_TERMINATOR 0
43 * Enum defining all known property types for ATS
44 * Enum values are used in the GNUNET_ATS_Information struct as (key,value)-pair
45 * 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]
46 * To keep the elements ordered
47 * 1..1024 : Values with a relation to cost
48 * 1025..2048 : Values with a relation to quality
51 enum GNUNET_ATS_Property
54 /* Cost related values */
55 /* =================== */
58 * Volume based cost in financial units to transmit data
60 * Note: This value is not bound to a specific currency or unit and only used locally
61 * "cent" just refers the smallest amount of money in the respective currency
65 * Interpretation: less is better
71 GNUNET_ATS_COST_FINANCIAL_PER_VOLUME = 1,
74 * Time based cost in financial units to transmit data
76 * Note: This value is not bound to a specific currency or unit and only used locally
77 * "cent" just refers the smallest amount of money in the respective currency
81 * Interpretation: less is better
87 GNUNET_ATS_COST_FINANCIAL_PER_TIME = 2,
92 * Effort of preparing data to be sent with this transport
93 * Includes encoding, encryption and conversion of data
94 * Partial values can be summed up: c_sum = c_enc + c_enc + c_conv
95 * Resulting values depend on local system properties, e.g. CPU
99 * Interpretation: less is better
103 * HTTPS with AES CBC-256: 7,382
104 * HTTPS with AES CBC-128: 5,279
105 * HTTPS with RC4-1024: 2,652
107 GNUNET_ATS_COST_COMPUTATIONAL = 3,
112 * Energy consumption using this transport when sending with a certain power at a certain bitrate
113 * This is only an approximation based on:
114 * Energy consumption E = P / D
117 * Power P in Watt (J/s)
118 * Datarate D in MBit/s
120 * Conversion between power P and dBm used by WLAN in radiotap's dBm TX power:
122 * Lp(dbm) = 10 log10 (P/ 1mW)
124 * => P = 1 mW * 10^(Lp(dbm)/10)
128 * Interpretation: less is better
133 * WLAN: 89 (600 mW @ 802.11g /w 54 MBit/s)
134 * Bluetooth: 267 (100 mW @ BT2.0 EDR /w 3 MBit/s)
136 GNUNET_ATS_COST_ENERGY_CONSUMPTION = 4,
140 * How many bytes are transmitted to initiate a new connection using this transport?
144 * Interpretation: less is better
148 * UDP (No connection) : 0 bytes
149 * TCP (TCP 3-Way handshake): 220 bytes Ethernet, 172 bytes TCP/IP, 122 bytes TCP
150 * HTTP (TCP + Header) : 477 bytes Ethernet, 429 bytes TCP/IP, 374 bytes TCP, 278 bytes HTTP
151 * HTTPS HTTP+TLS Handshake: 2129 bytes Ethernet, 1975 bytes TCP/IP, 1755 bytes TCP, 1403 bytes HTTPS
154 GNUNET_ATS_COST_CONNECT = 5,
159 * How many bandwidth is available to consume?
160 * Used to calculate which impact sending data with this transport has
164 * Interpretation: more is better
167 * LAN: 12,800 (100 MBit/s)
168 * WLAN: 6,912 (54 MBit/s)
169 * Dial-up: 8 (64 Kbit/s)
172 GNUNET_ATS_COST_BANDWITH_AVAILABLE = 6,
177 * How many bytes are sent over the wire when 1 kilobyte (1024 bytes) of application data is transmitted?
178 * A factor used with connect cost, bandwidth cost and energy cost to describe the overhead produced by the transport protocol
182 * Interpretation: less is better
186 * TCP/IPv4 over Ethernet: 1024 + 38 + 20 + 20 = 1102 [bytes/kb]
187 * TCP/IPv6 over Ethernet: 1024 + 38 + 20 + 40 = 1122 [bytes/kb]
188 * UDP/IPv4 over Ethernet: 1024 + 38 + 20 + 8 = 1090 [bytes/kb]
189 * UDP/IPv6 over Ethernet: 1024 + 38 + 40 + 8 = 1110 [bytes/kb]
191 GNUNET_ATS_COST_NETWORK_OVERHEAD = 7,
194 /* Quality related values */
195 /* ====================== */
197 /* Physical layer quality properties */
200 * Signal strength on physical layer
204 GNUNET_ATS_QUALITY_PHY_SIGNAL_STRENGTH = 1025,
207 * Collision rate on physical layer
211 GNUNET_ATS_QUALITY_PHY_COLLISION_RATE = 1026,
214 * Error rate on physical layer
218 GNUNET_ATS_QUALITY_PHY_ERROR_RATE = 1027,
220 /* Network layer quality properties */
224 * Time between when the time packet is sent and the packet arrives
234 GNUNET_ATS_QUALITY_NET_DELAY = 1028,
238 * Time variations of the delay
239 * 1st derivative of a delay function
243 GNUNET_ATS_QUALITY_NET_JITTER = 1029,
246 * Error rate on network layer
255 * Note: This numbers are just assumptions as an example, not measured or somehow determined
257 GNUNET_ATS_QUALITY_NET_ERRORRATE = 1030,
260 * Drop rate on network layer
261 * Bytes actively dismissed by a network component during transmission
262 * Reasons for dropped data can be full queues, congestion, quota violations...
271 * Note: This numbers are just assumptions as an example, not measured or somehow determined
273 GNUNET_ATS_QUALITY_NET_DROPRATE = 1031,
276 * Loss rate on network layer
277 * Bytes lost during transmission
278 * Reasons can be collisions, ...
287 * Note: This numbers are just assumptions as an example, not measured or somehow determined
289 GNUNET_ATS_QUALITY_NET_LOSSRATE = 1032,
292 * Throughput on network layer
303 GNUNET_ATS_QUALITY_NET_THROUGHPUT = 1033
307 * This structure will be used by plugins to communicate costs to ATS or by higher level components to tell ATS their constraints
308 * Always a pair of (GNUNET_ATS_Property, uint32_t value)
309 * Value is always uint32_t, so all units used to define costs have to be normalized to fit uint32_t
311 struct GNUNET_ATS_Information