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3545 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; Copyright (C) KolibriOS team 2004-2013. All rights reserved. ;; |
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4 | ;; Distributed under terms of the GNU General Public License ;; |
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5 | ;; ;; |
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6 | ;; Part of the TCP/IP network stack for KolibriOS ;; |
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7 | ;; ;; |
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8 | ;; Written by hidnplayr@kolibrios.org ;; |
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9 | ;; ;; |
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10 | ;; Based on the code of 4.4BSD ;; |
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11 | ;; ;; |
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12 | ;; GNU GENERAL PUBLIC LICENSE ;; |
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13 | ;; Version 2, June 1991 ;; |
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14 | ;; ;; |
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15 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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16 | |||
17 | $Revision: 3406 $ |
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18 | |||
19 | ; Socket states |
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20 | TCPS_CLOSED = 0 |
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21 | TCPS_LISTEN = 1 |
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22 | TCPS_SYN_SENT = 2 |
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23 | TCPS_SYN_RECEIVED = 3 |
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24 | TCPS_ESTABLISHED = 4 |
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25 | TCPS_CLOSE_WAIT = 5 |
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26 | TCPS_FIN_WAIT_1 = 6 |
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27 | TCPS_CLOSING = 7 |
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28 | TCPS_LAST_ACK = 8 |
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29 | TCPS_FIN_WAIT_2 = 9 |
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30 | TCPS_TIMED_WAIT = 10 |
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31 | |||
32 | ; Socket Flags |
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33 | TF_ACKNOW = 1 shl 0 ; ack peer immediately |
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34 | TF_DELACK = 1 shl 1 ; ack, but try to delay it |
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35 | TF_NODELAY = 1 shl 2 ; don't delay packets to coalesce |
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36 | TF_NOOPT = 1 shl 3 ; don't use tcp options |
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37 | TF_SENTFIN = 1 shl 4 ; have sent FIN |
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38 | TF_REQ_SCALE = 1 shl 5 ; have/will request window scaling |
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39 | TF_RCVD_SCALE = 1 shl 6 ; other side has requested scaling |
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40 | TF_REQ_TSTMP = 1 shl 7 ; have/will request timestamps |
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41 | TF_RCVD_TSTMP = 1 shl 8 ; a timestamp was received in SYN |
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42 | TF_SACK_PERMIT = 1 shl 9 ; other side said I could SACK |
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43 | |||
44 | ; Segment flags |
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45 | TH_FIN = 1 shl 0 |
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46 | TH_SYN = 1 shl 1 |
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47 | TH_RST = 1 shl 2 |
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48 | TH_PUSH = 1 shl 3 |
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49 | TH_ACK = 1 shl 4 |
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50 | TH_URG = 1 shl 5 |
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51 | |||
52 | ; Segment header options |
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53 | TCP_OPT_EOL = 0 ; End of option list. |
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54 | TCP_OPT_NOP = 1 ; No-Operation. |
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55 | TCP_OPT_MAXSEG = 2 ; Maximum Segment Size. |
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56 | TCP_OPT_WINDOW = 3 ; window scale |
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57 | TCP_OPT_SACK_PERMIT = 4 ; Selective Acknowledgement |
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58 | TCP_OPT_SACK = 5 |
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59 | TCP_OPT_TIMESTAMP = 8 |
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60 | |||
61 | ; Fundamental timer values |
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62 | TCP_time_MSL = 47 ; max segment lifetime (30s) |
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63 | TCP_time_re_min = 2 ; min retransmission (1,28s) |
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64 | TCP_time_re_max = 100 ; max retransmission (64s) |
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65 | TCP_time_pers_min = 8 ; min persist (5,12s) |
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66 | TCP_time_pers_max = 94 ; max persist (60,16s) |
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67 | TCP_time_keep_init = 118 ; connection establishment (75,52s) |
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68 | TCP_time_keep_idle = 4608 ; idle time before 1st probe (2h) |
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69 | TCP_time_keep_interval = 118 ; between probes when no response (75,52s) |
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70 | TCP_time_rtt_default = 5 ; default Round Trip Time (3,2s) |
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71 | TCP_time_srtt_default = 0 ; |
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72 | TCP_time_max_idle = 8*TCP_time_keep_interval ; FIXME |
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73 | |||
4030 | hidnplayr | 74 | TCP_time_connect = 300 ; in 1/100s (default=3s) |
75 | |||
3545 | hidnplayr | 76 | ; timer constants |
77 | TCP_max_rxtshift = 12 ; max retransmissions waiting for ACK |
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78 | TCP_max_keepcnt = 8 ; max keepalive probes |
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79 | |||
80 | ; |
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81 | TCP_max_winshift = 14 |
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82 | TCP_max_win = 65535 |
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83 | |||
84 | TCP_re_xmit_thresh = 3 |
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85 | |||
86 | TCP_mss_default = 1480 ; default max segment size |
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87 | |||
88 | ; smoothed round trip time and estimated variance are stored as fixed point numbers, |
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89 | ; shifted by the value below. |
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90 | ; With these scales, srtt has 3 bits to the right of the binary point, and thus an "alpha" |
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91 | ; of .875. rttvar has 2 bits to the right and thus "alpha" of 0.75 |
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92 | TCP_RTT_SHIFT = 3 |
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93 | TCP_RTTVAR_SHIFT = 2 |
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94 | |||
95 | ; bits used by tcp_input and tcp_output |
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96 | TCP_BIT_NEEDOUTPUT = 1 shl 0 |
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97 | TCP_BIT_TIMESTAMP = 1 shl 1 |
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98 | TCP_BIT_DROPSOCKET = 1 shl 2 |
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99 | |||
100 | TCP_BIT_SENDALOT = 1 shl 0 |
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101 | |||
102 | TCP_PAWS_IDLE = 24*24*60*60*100 ; 24 days, in 1/100 seconds |
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103 | |||
104 | TCP_QUEUE_SIZE = 50 |
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105 | |||
106 | struct TCP_header |
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107 | |||
108 | SourcePort dw ? |
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109 | DestinationPort dw ? |
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110 | SequenceNumber dd ? |
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111 | AckNumber dd ? |
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112 | DataOffset db ? ; DataOffset[0-3 bits] and Reserved[4-7] |
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113 | Flags db ? ; Reserved[0-1 bits]|URG|ACK|PSH|RST|SYN|FIN |
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114 | Window dw ? |
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115 | Checksum dw ? |
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116 | UrgentPointer dw ? |
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117 | |||
118 | ends |
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119 | |||
120 | struct TCP_queue_entry |
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121 | |||
122 | ip_ptr dd ? |
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123 | segment_ptr dd ? |
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124 | segment_size dd ? |
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125 | device_ptr dd ? |
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126 | |||
127 | buffer_ptr dd ? |
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128 | timestamp dd ? |
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129 | |||
130 | ends |
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131 | |||
3697 | hidnplayr | 132 | uglobal |
3545 | hidnplayr | 133 | align 4 |
3697 | hidnplayr | 134 | |
3600 | hidnplayr | 135 | TCP_segments_tx rd NET_DEVICES_MAX |
136 | TCP_segments_rx rd NET_DEVICES_MAX |
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137 | TCP_segments_missed rd NET_DEVICES_MAX |
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138 | TCP_segments_dumped rd NET_DEVICES_MAX |
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139 | ; TCP_bytes_rx rq NET_DEVICES_MAX |
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140 | ; TCP_bytes_tx rq NET_DEVICES_MAX |
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3545 | hidnplayr | 141 | TCP_sequence_num dd ? |
3697 | hidnplayr | 142 | TCP_queue rd (TCP_QUEUE_SIZE*sizeof.TCP_queue_entry + sizeof.queue)/4 |
3545 | hidnplayr | 143 | TCP_input_event dd ? |
144 | endg |
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145 | |||
146 | |||
147 | ;----------------------------------------------------------------- |
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148 | ; |
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149 | ; TCP_init |
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150 | ; |
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151 | ; This function resets all TCP variables |
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152 | ; |
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153 | ;----------------------------------------------------------------- |
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154 | macro TCP_init { |
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155 | |||
156 | xor eax, eax |
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157 | mov edi, TCP_segments_tx |
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3600 | hidnplayr | 158 | mov ecx, (6*NET_DEVICES_MAX) |
3711 | clevermous | 159 | rep stosd |
3545 | hidnplayr | 160 | |
161 | pseudo_random eax |
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162 | mov [TCP_sequence_num], eax |
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163 | |||
164 | init_queue TCP_queue |
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165 | |||
3598 | clevermous | 166 | movi ebx, 1 |
3545 | hidnplayr | 167 | mov ecx, TCP_process_input |
168 | call new_sys_threads |
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3697 | hidnplayr | 169 | test eax, eax |
170 | jns @f |
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171 | DEBUGF DEBUG_NETWORK_ERROR,'K : cannot create kernel thread for TCP, error %d\n', eax |
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172 | @@: |
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3545 | hidnplayr | 173 | |
174 | } |
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175 | |||
176 | |||
177 | include 'tcp_timer.inc' |
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178 | include 'tcp_subr.inc' |
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179 | include 'tcp_usreq.inc' |
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180 | include 'tcp_input.inc' |
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181 | include 'tcp_output.inc' |
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182 | |||
183 | |||
184 | ;--------------------------------------------------------------------------- |
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185 | ; |
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186 | ; TCP_API |
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187 | ; |
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188 | ; This function is called by system function 76 |
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189 | ; |
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190 | ; IN: subfunction number in bl |
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191 | ; device number in bh |
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192 | ; ecx, edx, .. depends on subfunction |
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193 | ; |
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194 | ; OUT: |
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195 | ; |
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196 | ;--------------------------------------------------------------------------- |
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197 | align 4 |
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198 | TCP_api: |
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199 | |||
200 | movzx eax, bh |
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201 | shl eax, 2 |
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202 | |||
203 | test bl, bl |
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204 | jz .packets_tx ; 0 |
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205 | dec bl |
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206 | jz .packets_rx ; 1 |
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207 | dec bl |
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208 | jz .packets_missed ; 2 |
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209 | dec bl |
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210 | jz .packets_dumped ; 3 |
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211 | |||
212 | .error: |
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213 | mov eax, -1 |
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214 | ret |
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215 | |||
216 | .packets_tx: |
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217 | mov eax, [TCP_segments_tx + eax] |
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218 | ret |
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219 | |||
220 | .packets_rx: |
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221 | mov eax, [TCP_segments_rx + eax] |
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222 | ret |
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223 | |||
224 | .packets_missed: |
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225 | mov eax, [TCP_segments_missed + eax] |
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226 | ret |
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227 | |||
228 | .packets_dumped: |
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229 | mov eax, [TCP_segments_dumped + eax] |
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230 | ret |