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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 * Enum defining all known cost types for ATS
29 * Enum values are used in the GNUNET_ATS_Cost_Information struct as (key,value)-pair
30 * 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]
33 enum GNUNET_ATS_Cost_Type
36 * Cost will be passed as struct GNUNET_ATS_Cost_Information[]
37 * array is 0-terminated:
38 * the last element in the array is the pair (GNUNET_ATS_ARRAY_TERMINATOR, 0)
40 GNUNET_ATS_ARRAY_TERMINATOR= 0,
42 /* Volume based cost in financial units to transmit data
43 * Note: this value is not bound to a specific currency or unit and only used locally
47 * Interpretation: less is better
53 GNUNET_ATS_FINANCIAL_PER_VOLUME_COST = 1,
55 /* Time based cost in financial units to transmit data
56 * Note: this value is not bound to a specific currency or unit
60 * Interpretation: less is better
66 GNUNET_ATS_FINANCIAL_PER_TIME_COST = 2,
68 /* Computational costs
69 * Effort of preparing data to send with this transport
70 * Includes encoding, encryption and conversion of data
71 * Partial values can be summed: c_sum = c_enc + c_conv + c_enc
72 * Resulting value depends on local system properties, e.g. CPU
76 * Interpretation: less is better
80 * HTTPS with AES CBC-256: 7,382
81 * HTTPS with AES CBC-128: 5,279
82 * HTTPS with RC4-1024: 2,652
84 GNUNET_ATS_COMPUTATIONAL_COST = 3,
87 * Energy consumption using this transport when sending with a certain power at a certain bitrate
88 * This is only an approximation based on:
89 * Energy consumption E = P / D
92 * Power P in Watt (J/s)
93 * Datarate D in MBit/s
97 * Interpretation: less is better
102 * WLAN: 89 (600 mW @ 802.11g /w 54 MBit/s)
103 * Bluetooth: 267 (100 mW @ BT2.0 EDR /w 3 MBit/s)
105 GNUNET_ATS_ENERGY_CONSUMPTION = 4,
108 * How expensive is it to initiate a new connection using this transport
112 * Interpretation: less is better
116 * UDP (No connection) : 0 bytes
117 * TCP (TCP 3-Way handshake): 220 bytes Ethernet, 172 bytes TCP/IP, 122 bytes TCP
118 * HTTP (TCP + Header) : 477 bytes Ethernet, 429 bytes TCP/IP, 374 bytes TCP, 278 bytes HTTP
119 * HTTPS HTTP+TLS Handshake: 2129 bytes Ethernet, 1975 bytes TCP/IP, 1755 bytes TCP, 1403 bytes HTTPS
122 GNUNET_ATS_CONNECT_COST = 5,
125 * How many bandwidth is available to consume
126 * Used to calculate which impact sending data with this transport has
130 * Interpretation: more is better
133 * LAN: 12,800 (100 MBit/s)
134 * WLAN: 6,912 (54 MBit/s)
135 * Dial-up: 8 (64 Kbit/s)
138 GNUNET_ATS_BANDWITH_COST = 6,
141 * a factor used with connect cost, bandwidth cost and energy cost to describe the overhead produced by the transport protocol
143 * Unit: [10,000 - (Efficiency in Percent * 100)]
145 * Interpretation: less is better
149 * TCP/IPv4 over Ethernet: 507 (Efficiency: 94,93 %)
150 * TCP/IPv6 over Ethernet: 646 (Efficiency: 93,64 %)
151 * UDP/IPv4 over Ethernet: 429 (Efficiency: 95,71 %)
152 * UDP/IPv6 over Ethernet: 559 (Efficiency: 94,41 %)
154 GNUNET_ATS_NETWORK_OVERHEAD_COST = 7,
158 * This structure will be used by plugins to communicate costs to ATS
159 * Always a pair of (GNUNET_ATS_Cost_Types, uint32_t value)
160 * Value is always uint32_t, so all units used to define costs have to be normalized to fit uint32_t
162 struct GNUNET_ATS_Cost_Information