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Rev | Author | Line No. | Line |
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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: 3289 $ |
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18 | |||
19 | ;----------------------------------------------------------------- |
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20 | ; |
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21 | ; TCP_output |
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22 | ; |
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23 | ; IN: eax = socket pointer |
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24 | ; |
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25 | ; OUT: / |
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26 | ; |
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27 | ;----------------------------------------------------------------- |
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28 | align 4 |
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4347 | hidnplayr | 29 | proc TCP_output |
3545 | hidnplayr | 30 | |
4347 | hidnplayr | 31 | locals |
32 | temp_bits db ? |
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33 | endl |
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34 | |||
3556 | hidnplayr | 35 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_output: socket=%x\n", eax |
3545 | hidnplayr | 36 | |
37 | push eax |
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38 | lea ecx, [eax + SOCKET.mutex] |
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39 | call mutex_lock |
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40 | pop eax |
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41 | |||
3652 | hidnplayr | 42 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_output: socket locked\n" |
43 | |||
3545 | hidnplayr | 44 | ; We'll detect the length of the data to be transmitted, and flags to be used |
45 | ; If there is some data, or any critical controls to send (SYN / RST), then transmit |
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46 | ; Otherwise, investigate further |
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47 | |||
48 | mov ebx, [eax + TCP_SOCKET.SND_MAX] |
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49 | cmp ebx, [eax + TCP_SOCKET.SND_UNA] |
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50 | jbe .not_idle |
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51 | |||
52 | mov ebx, [eax + TCP_SOCKET.t_idle] |
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53 | cmp ebx, [eax + TCP_SOCKET.t_rxtcur] |
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54 | jbe .not_idle |
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55 | |||
56 | ; We have been idle for a while and no ACKS are expected to clock out any data we send.. |
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57 | ; Slow start to get ack "clock" running again. |
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58 | |||
59 | mov ebx, [eax + TCP_SOCKET.t_maxseg] |
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60 | mov [eax + TCP_SOCKET.SND_CWND], ebx |
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61 | |||
62 | .not_idle: |
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63 | .again: |
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4347 | hidnplayr | 64 | mov [temp_bits], 0 |
3545 | hidnplayr | 65 | |
66 | mov ebx, [eax + TCP_SOCKET.SND_NXT] ; calculate offset (71) |
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67 | sub ebx, [eax + TCP_SOCKET.SND_UNA] ; |
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68 | |||
69 | mov ecx, [eax + TCP_SOCKET.SND_WND] ; determine window |
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70 | cmp ecx, [eax + TCP_SOCKET.SND_CWND] ; |
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71 | jb @f ; |
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72 | mov ecx, [eax + TCP_SOCKET.SND_CWND] ; |
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73 | @@: ; |
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74 | |||
75 | call TCP_outflags ; flags in dl |
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76 | |||
77 | ;------------------------ |
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78 | ; data being forced out ? |
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79 | |||
80 | ; If in persist timeout with window of 0, send 1 byte. |
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81 | ; Otherwise, if window is small but nonzero, and timer expired, |
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82 | ; we will send what we can and go to transmit state |
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83 | |||
84 | cmp [eax + TCP_SOCKET.t_force], 0 |
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85 | je .no_force |
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86 | |||
3556 | hidnplayr | 87 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_output: forcing data out\n" |
3545 | hidnplayr | 88 | |
89 | test ecx, ecx |
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90 | jnz .no_zero_window |
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91 | |||
92 | cmp ebx, [eax + STREAM_SOCKET.snd.size] |
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93 | jae @f |
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94 | |||
95 | and dl, not (TH_FIN) |
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96 | |||
97 | @@: |
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98 | inc ecx |
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99 | jmp .no_force |
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100 | |||
101 | .no_zero_window: |
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3603 | hidnplayr | 102 | and [eax + TCP_SOCKET.timer_flags], not timer_flag_persist |
3545 | hidnplayr | 103 | mov [eax + TCP_SOCKET.t_rxtshift], 0 |
104 | |||
105 | .no_force: |
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106 | |||
107 | ;-------------------------------- |
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108 | ; Calculate how much data to send (106) |
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109 | |||
110 | mov esi, [eax + STREAM_SOCKET.snd.size] |
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111 | cmp esi, ecx |
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112 | jb @f |
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113 | mov esi, ecx |
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114 | @@: |
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115 | sub esi, ebx |
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116 | |||
117 | |||
118 | ;------------------------ |
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119 | ; check for window shrink (107) |
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120 | |||
121 | ; If FIN has been set, but not ACKed, but we havent been called to retransmit, esi will be -1 |
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122 | ; Otherwise, window shrank after we sent into it. |
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123 | |||
124 | jae .not_persist |
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125 | |||
126 | ; enter persist state |
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127 | xor esi, esi |
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128 | |||
129 | ; If window shrank to 0 |
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130 | test ecx, ecx |
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131 | jnz @f |
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132 | |||
133 | ; cancel pending retransmit |
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3603 | hidnplayr | 134 | and [eax + TCP_SOCKET.timer_flags], not timer_flag_retransmission |
3545 | hidnplayr | 135 | |
136 | ; pull SND_NXT back to (closed) window, We will enter persist state below. |
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137 | push [eax + TCP_SOCKET.SND_UNA] |
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138 | pop [eax + TCP_SOCKET.SND_NXT] |
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139 | @@: |
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140 | |||
141 | ; If window didn't close completely, just wait for an ACK |
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142 | |||
143 | .not_persist: |
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144 | |||
145 | ;--------------------------- |
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146 | ; Send one segment at a time (124) |
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147 | |||
148 | cmp esi, [eax + TCP_SOCKET.t_maxseg] |
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149 | jbe @f |
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150 | |||
151 | mov esi, [eax + TCP_SOCKET.t_maxseg] |
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4347 | hidnplayr | 152 | or [temp_bits], TCP_BIT_SENDALOT |
3545 | hidnplayr | 153 | @@: |
154 | |||
155 | ;-------------------------------------------- |
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156 | ; Turn of FIN flag if send buffer not emptied (128) |
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157 | |||
158 | mov edi, [eax + TCP_SOCKET.SND_NXT] |
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159 | add edi, esi |
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160 | sub edi, [eax + TCP_SOCKET.SND_UNA] |
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161 | cmp edi, [eax + STREAM_SOCKET.snd.size] |
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162 | jae @f |
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163 | and dl, not (TH_FIN) |
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164 | |||
165 | @@: |
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166 | |||
167 | ;------------------------------- |
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168 | ; calculate window advertisement (130) |
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169 | |||
170 | mov ecx, SOCKET_MAXDATA |
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171 | sub ecx, [eax + STREAM_SOCKET.rcv.size] |
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172 | |||
173 | ;------------------------------ |
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174 | ; Sender silly window avoidance (131) |
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175 | |||
176 | test esi, esi |
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177 | jz .len_zero |
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178 | |||
179 | cmp esi, [eax + TCP_SOCKET.t_maxseg] |
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180 | je TCP_send |
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181 | |||
182 | add ebx, esi ; offset + length |
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183 | cmp ebx, [eax + STREAM_SOCKET.snd.size] |
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184 | jb @f |
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185 | |||
186 | test [eax + TCP_SOCKET.t_flags], TF_NODELAY |
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187 | jnz TCP_send |
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188 | |||
189 | mov ebx, [eax + TCP_SOCKET.SND_MAX] |
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190 | cmp ebx, [eax + TCP_SOCKET.SND_UNA] |
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191 | je TCP_send |
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192 | @@: |
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193 | |||
194 | test [eax + TCP_SOCKET.t_force], -1 ;;; |
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195 | jnz TCP_send |
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196 | |||
197 | mov ebx, [eax + TCP_SOCKET.max_sndwnd] |
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198 | shr ebx, 1 |
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199 | cmp esi, ebx |
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200 | jae TCP_send |
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201 | |||
202 | mov ebx, [eax + TCP_SOCKET.SND_NXT] |
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203 | cmp ebx, [eax + TCP_SOCKET.SND_MAX] |
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204 | jb TCP_send |
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205 | |||
206 | .len_zero: |
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207 | |||
208 | ;---------------------------------------- |
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209 | ; Check if a window update should be sent (154) |
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210 | |||
3556 | hidnplayr | 211 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_output: window=%d\n", ecx |
3545 | hidnplayr | 212 | |
213 | ; Compare available window to amount of window known to peer (as advertised window less next expected input) |
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214 | ; If the difference is at least two max size segments, or at least 50% of the maximum possible window, |
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215 | ; Then we want to send a window update to the peer. |
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216 | |||
217 | test ecx, ecx |
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218 | jz .no_window |
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219 | |||
220 | push ecx |
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221 | mov cl, [eax + TCP_SOCKET.RCV_SCALE] |
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222 | mov ebx, TCP_max_win |
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223 | shl ebx, cl |
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224 | pop ecx |
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3652 | hidnplayr | 225 | |
3545 | hidnplayr | 226 | cmp ebx, ecx |
227 | jb @f |
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228 | mov ebx, ecx |
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229 | @@: |
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230 | sub ebx, [eax + TCP_SOCKET.RCV_ADV] |
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231 | add ebx, [eax + TCP_SOCKET.RCV_NXT] |
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232 | |||
233 | mov edi, [eax + TCP_SOCKET.t_maxseg] |
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234 | shl edi, 1 |
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235 | |||
236 | ; cmp ebx, edi |
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237 | ; jae TCP_send |
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238 | |||
239 | ; cmp ebx, [eax + TCP_SOCKET.] ;;; TODO: check with receive buffer high water mark |
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240 | ; jae TCP_send |
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241 | |||
242 | .no_window: |
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243 | |||
244 | ;-------------------------- |
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245 | ; Should a segment be sent? (174) |
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246 | |||
3556 | hidnplayr | 247 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_output: 174\n" |
3545 | hidnplayr | 248 | |
249 | test [eax + TCP_SOCKET.t_flags], TF_ACKNOW ; we need to ACK |
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250 | jnz TCP_send |
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251 | |||
252 | test dl, TH_SYN + TH_RST ; we need to send a SYN or RST |
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253 | jnz TCP_send |
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254 | |||
255 | mov ebx, [eax + TCP_SOCKET.SND_UP] ; when urgent pointer is beyond start of send bufer |
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256 | cmp ebx, [eax + TCP_SOCKET.SND_UNA] |
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257 | ja TCP_send |
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258 | |||
259 | test dl, TH_FIN |
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260 | jz .enter_persist ; no reason to send, enter persist state |
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261 | |||
262 | ; FIN was set, only send if not already sent, or on retransmit |
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263 | |||
264 | test [eax + TCP_SOCKET.t_flags], TF_SENTFIN |
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265 | jz TCP_send |
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266 | |||
267 | mov ebx, [eax + TCP_SOCKET.SND_NXT] |
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268 | cmp ebx, [eax + TCP_SOCKET.SND_UNA] |
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269 | je TCP_send |
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270 | |||
271 | ;-------------------- |
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272 | ; Enter persist state (191) |
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273 | |||
274 | .enter_persist: |
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275 | |||
3600 | hidnplayr | 276 | cmp [eax + STREAM_SOCKET.snd.size], 0 ; Data ready to send? |
3545 | hidnplayr | 277 | jne @f |
3603 | hidnplayr | 278 | and [eax + TCP_SOCKET.timer_flags], not timer_flag_retransmission |
3545 | hidnplayr | 279 | jne @f |
280 | |||
3603 | hidnplayr | 281 | test [eax + TCP_SOCKET.timer_flags], timer_flag_persist ; Persist timer already expired? |
3600 | hidnplayr | 282 | jnz @f |
283 | |||
3556 | hidnplayr | 284 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_output: Entering persist state\n" |
3545 | hidnplayr | 285 | |
286 | mov [eax + TCP_SOCKET.t_rxtshift], 0 |
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287 | call TCP_set_persist |
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288 | @@: |
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289 | |||
290 | ;---------------------------- |
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291 | ; No reason to send a segment (219) |
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292 | |||
3556 | hidnplayr | 293 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_output: No reason to send a segment\n" |
3545 | hidnplayr | 294 | |
295 | pusha |
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296 | lea ecx, [eax + SOCKET.mutex] |
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297 | call mutex_unlock |
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298 | popa |
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299 | |||
300 | ; Fixme: returnvalue? |
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301 | |||
302 | ret |
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303 | |||
304 | |||
305 | |||
306 | |||
307 | |||
308 | |||
309 | |||
310 | |||
311 | |||
312 | ;----------------------------------------------- |
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313 | ; |
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314 | ; Send a segment (222) |
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315 | ; |
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316 | ; eax = socket pointer |
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317 | ; esi = data len |
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318 | ; dl = flags |
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319 | ; |
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320 | ;----------------------------------------------- |
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321 | align 4 |
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322 | TCP_send: |
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323 | |||
3556 | hidnplayr | 324 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_send: socket=%x length=%u flags=%x\n", eax, esi, dl |
3545 | hidnplayr | 325 | |
326 | push eax ; save socket ptr |
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327 | push esi ; and data length too |
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328 | mov edi, sizeof.TCP_header ; edi will contain headersize |
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329 | |||
330 | ;------------------------------------ |
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331 | ; Send options with first SYN segment |
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332 | |||
333 | test dl, TH_SYN |
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334 | jz .options_done |
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335 | |||
336 | push [eax + TCP_SOCKET.ISS] |
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337 | pop [eax + TCP_SOCKET.SND_NXT] |
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338 | |||
339 | test [eax + TCP_SOCKET.t_flags], TF_NOOPT |
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340 | jnz .options_done |
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341 | |||
342 | mov ecx, 1460 ;;;; FIXME: use routing blablabla to determine MSS |
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343 | or ecx, TCP_OPT_MAXSEG shl 24 + 4 shl 16 |
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344 | bswap ecx |
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345 | push ecx |
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346 | add di, 4 |
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347 | |||
3556 | hidnplayr | 348 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_send: added maxseg option\n" |
3545 | hidnplayr | 349 | |
350 | test [eax + TCP_SOCKET.t_flags], TF_REQ_SCALE |
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351 | jz .no_scale |
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352 | |||
353 | test dl, TH_ACK |
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354 | jz .scale_opt |
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355 | |||
356 | test [eax + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
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357 | jz .no_scale |
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358 | |||
359 | .scale_opt: |
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360 | mov cl, [eax + TCP_SOCKET.request_r_scale] |
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361 | mov ch, TCP_OPT_NOP |
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362 | pushw cx |
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363 | pushw TCP_OPT_WINDOW + 3 shl 8 |
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364 | add di, 4 |
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365 | |||
3556 | hidnplayr | 366 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_send: added scale option\n" |
3545 | hidnplayr | 367 | |
368 | .no_scale: |
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369 | .no_syn: |
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370 | |||
371 | ;------------------------------------ |
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372 | ; Make the timestamp option if needed |
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373 | |||
374 | test [eax + TCP_SOCKET.t_flags], TF_REQ_TSTMP |
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375 | jz .no_timestamp |
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376 | |||
377 | test dl, TH_RST |
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378 | jnz .no_timestamp |
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379 | |||
380 | test dl, TH_ACK |
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381 | jz .timestamp |
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382 | |||
383 | test [eax + TCP_SOCKET.t_flags], TF_RCVD_TSTMP |
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384 | jz .no_timestamp |
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385 | |||
386 | .timestamp: |
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387 | pushd 0 |
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388 | pushd [timer_ticks] |
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389 | pushd TCP_OPT_NOP + TCP_OPT_NOP shl 8 + TCP_OPT_TIMESTAMP shl 16 + 10 shl 24 |
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390 | add di, 12 |
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391 | |||
3556 | hidnplayr | 392 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_send: added timestamp\n" |
3545 | hidnplayr | 393 | |
394 | .no_timestamp: |
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395 | |||
396 | ; |
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397 | |||
398 | .options_done: |
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399 | |||
400 | ; eax = socket ptr |
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401 | ; edx = flags |
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402 | ; edi = header size |
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403 | ; esi = data len |
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404 | |||
405 | ;--------------------------------------------- |
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406 | ; check if we dont exceed the max segment size (270) |
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407 | |||
408 | add esi, edi ; total TCP segment size |
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409 | cmp esi, [eax + TCP_SOCKET.t_maxseg] |
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410 | jbe .no_overflow |
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411 | |||
412 | mov esi, [eax + TCP_SOCKET.t_maxseg] |
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4347 | hidnplayr | 413 | or [temp_bits], TCP_BIT_SENDALOT |
3545 | hidnplayr | 414 | .no_overflow: |
415 | |||
4347 | hidnplayr | 416 | ;---------------------------------------------------- |
417 | ; Calculate the receive window. |
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418 | ; Dont shrink window, but avoid silly window syndrome |
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419 | |||
420 | mov ebx, SOCKET_MAXDATA |
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421 | sub ebx, [eax + STREAM_SOCKET.rcv.size] |
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422 | |||
423 | cmp ebx, SOCKET_MAXDATA/4 |
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424 | jae @f |
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425 | cmp ebx, [eax + TCP_SOCKET.t_maxseg] |
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426 | jae @f |
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427 | xor ebx, ebx |
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428 | @@: |
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429 | |||
430 | cmp ebx, TCP_max_win |
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431 | jbe @f |
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432 | mov ebx, TCP_max_win |
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433 | @@: |
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434 | |||
435 | mov ecx, [eax + TCP_SOCKET.RCV_ADV] |
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436 | sub ecx, [eax + TCP_SOCKET.RCV_NXT] |
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437 | cmp ebx, ecx |
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438 | ja @f |
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439 | mov ebx, ecx |
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440 | @@: |
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441 | |||
442 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_send: window = %u\n", ebx |
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443 | |||
444 | mov cl, [eax + TCP_SOCKET.RCV_SCALE] |
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445 | shr ebx, cl |
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446 | xchg bl, bh |
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447 | |||
3545 | hidnplayr | 448 | ;----------------------------------------------------------------- |
449 | ; Start by pushing all TCP header values in reverse order on stack |
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450 | ; (essentially, creating the tcp header on the stack!) |
||
451 | |||
452 | pushw 0 ; .UrgentPointer dw ? |
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453 | pushw 0 ; .Checksum dw ? |
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4347 | hidnplayr | 454 | pushw bx ; .Window dw ? |
3545 | hidnplayr | 455 | shl edi, 2 ; .DataOffset db ? only 4 left-most bits |
456 | shl dx, 8 |
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457 | or dx, di ; .Flags db ? |
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458 | pushw dx |
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459 | shr edi, 2 ; .DataOffset db ? |
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460 | |||
461 | push [eax + TCP_SOCKET.RCV_NXT] ; .AckNumber dd ? |
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462 | ntohd [esp] |
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463 | |||
464 | push [eax + TCP_SOCKET.SND_NXT] ; .SequenceNumber dd ? |
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465 | ntohd [esp] |
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466 | |||
467 | push [eax + TCP_SOCKET.RemotePort] ; .DestinationPort dw ? |
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468 | push [eax + TCP_SOCKET.LocalPort] ; .SourcePort dw ? |
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469 | |||
470 | push edi ; header size |
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471 | |||
472 | ;--------------------- |
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473 | ; Create the IP packet |
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474 | |||
475 | mov ecx, esi |
||
476 | mov edx, [eax + IP_SOCKET.LocalIP] ; source ip |
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477 | mov eax, [eax + IP_SOCKET.RemoteIP] ; dest ip |
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478 | mov di, IP_PROTO_TCP shl 8 + 128 |
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479 | call IPv4_output |
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480 | jz .ip_error |
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481 | |||
482 | ;----------------------------------------- |
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483 | ; Move TCP header from stack to TCP packet |
||
484 | |||
485 | push ecx |
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486 | mov ecx, [esp + 4] |
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487 | lea esi, [esp + 8] |
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488 | shr ecx, 2 ; count is in bytes, we will work with dwords |
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3711 | clevermous | 489 | rep movsd |
3545 | hidnplayr | 490 | pop ecx ; full TCP packet size |
491 | |||
492 | pop esi ; headersize |
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493 | add esp, esi ; remove it from stack |
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494 | |||
495 | push edx ; packet size for send proc |
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496 | push eax ; packet ptr for send proc |
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497 | |||
498 | mov edx, edi ; begin of data |
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499 | sub edx, esi ; begin of packet (edi = begin of data) |
||
500 | push ecx |
||
501 | sub ecx, esi ; data size |
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502 | |||
503 | ;-------------- |
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504 | ; Copy the data |
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505 | |||
506 | ; eax = ptr to ring struct |
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507 | ; ecx = buffer size |
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508 | ; edi = ptr to buffer |
||
509 | |||
510 | mov eax, [esp + 16] ; get socket ptr |
||
511 | |||
512 | push edx |
||
513 | push [eax + TCP_SOCKET.SND_NXT] ; we'll need this for timing the transmission |
||
514 | test ecx, ecx |
||
515 | jz .nodata |
||
516 | mov edx, [eax + TCP_SOCKET.SND_NXT] |
||
517 | add [eax + TCP_SOCKET.SND_NXT], ecx ; update sequence number <<< CHECKME |
||
518 | sub edx, [eax + TCP_SOCKET.SND_UNA] ; offset |
||
519 | add eax, STREAM_SOCKET.snd |
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520 | call SOCKET_ring_read |
||
521 | .nodata: |
||
522 | pop edi |
||
523 | pop esi ; begin of data |
||
524 | pop ecx ; full packet size |
||
525 | mov eax, [esp + 12] ; socket ptr |
||
526 | |||
527 | ;---------------------------------- |
||
528 | ; initialize retransmit timer (400) |
||
529 | |||
530 | ;TODO: check t_force and persist |
||
531 | |||
532 | test [esi + TCP_header.Flags], TH_SYN + TH_FIN ; syn and fin take a sequence number |
||
533 | jz @f |
||
534 | inc [eax + TCP_SOCKET.SND_NXT] |
||
535 | test [esi + TCP_header.Flags], TH_FIN |
||
536 | jz @f |
||
537 | or [eax + TCP_SOCKET.t_flags], TF_SENTFIN ; if we sent a fin, set the sentfin flag |
||
538 | @@: |
||
539 | |||
540 | mov edx, [eax + TCP_SOCKET.SND_NXT] |
||
541 | cmp edx, [eax + TCP_SOCKET.SND_MAX] ; is this a retransmission? |
||
542 | jbe @f |
||
543 | mov [eax + TCP_SOCKET.SND_MAX], edx ; [eax + TCP_SOCKET.SND_NXT] from before we updated it |
||
544 | |||
545 | cmp [eax + TCP_SOCKET.t_rtt], 0 ; are we currently timing anything? |
||
546 | je @f |
||
547 | mov [eax + TCP_SOCKET.t_rtt], 1 ; nope, start transmission timer |
||
548 | mov [eax + TCP_SOCKET.t_rtseq], edi |
||
549 | ;TODO: update stats |
||
550 | @@: |
||
551 | |||
552 | ; set retransmission timer if not already set, and not doing an ACK or keepalive probe |
||
3600 | hidnplayr | 553 | test [eax + TCP_SOCKET.timer_flags], timer_flag_retransmission |
554 | jnz .retransmit_set |
||
3545 | hidnplayr | 555 | |
556 | cmp edx, [eax + TCP_SOCKET.SND_UNA] ; edx is still [eax + TCP_SOCKET.SND_NXT] |
||
557 | je .retransmit_set |
||
558 | |||
559 | mov edx, [eax + TCP_SOCKET.t_rxtcur] |
||
560 | mov [eax + TCP_SOCKET.timer_retransmission], edx |
||
3603 | hidnplayr | 561 | or [eax + TCP_SOCKET.timer_flags], timer_flag_retransmission |
3545 | hidnplayr | 562 | |
3600 | hidnplayr | 563 | test [eax + TCP_SOCKET.timer_flags], timer_flag_persist |
564 | jz .retransmit_set |
||
3603 | hidnplayr | 565 | and [eax + TCP_SOCKET.timer_flags], not timer_flag_persist |
3545 | hidnplayr | 566 | mov [eax + TCP_SOCKET.t_rxtshift], 0 |
567 | |||
568 | .retransmit_set: |
||
569 | |||
570 | ;-------------------- |
||
571 | ; Create the checksum |
||
572 | |||
573 | TCP_checksum (eax + IP_SOCKET.LocalIP), (eax + IP_SOCKET.RemoteIP) |
||
574 | mov [esi + TCP_header.Checksum], dx |
||
575 | |||
576 | ;---------------- |
||
577 | ; Send the packet |
||
578 | |||
3556 | hidnplayr | 579 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_send: Sending with device %x\n", ebx |
3545 | hidnplayr | 580 | call [ebx + NET_DEVICE.transmit] |
581 | jnz .send_error |
||
582 | |||
583 | ;--------------- |
||
584 | ; Ok, data sent! |
||
585 | |||
586 | pop ecx |
||
587 | pop eax |
||
588 | |||
3644 | hidnplayr | 589 | call NET_ptr_to_num4 |
590 | inc [TCP_segments_tx + edi] |
||
3545 | hidnplayr | 591 | |
592 | ; update advertised receive window |
||
593 | test ecx, ecx |
||
594 | jz @f |
||
595 | add ecx, [eax + TCP_SOCKET.RCV_NXT] |
||
596 | cmp ecx, [eax + TCP_SOCKET.RCV_ADV] |
||
597 | jbe @f |
||
598 | mov [eax + TCP_SOCKET.RCV_ADV], ecx |
||
599 | @@: |
||
600 | |||
601 | ; update last ack sent |
||
602 | push [eax + TCP_SOCKET.RCV_NXT] |
||
603 | pop [eax + TCP_SOCKET.last_ack_sent] |
||
604 | |||
4347 | hidnplayr | 605 | ; clear the ACK flags |
3545 | hidnplayr | 606 | and [eax + TCP_SOCKET.t_flags], not (TF_ACKNOW + TF_DELACK) |
607 | |||
608 | ;-------------- |
||
609 | ; unlock socket |
||
610 | |||
3652 | hidnplayr | 611 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_send: unlocking socket 0x%x\n", eax |
612 | |||
3545 | hidnplayr | 613 | push eax |
614 | lea ecx, [eax + SOCKET.mutex] |
||
615 | call mutex_unlock |
||
616 | pop eax |
||
617 | |||
618 | ;----------------------------- |
||
619 | ; Check if we need more output |
||
620 | |||
4347 | hidnplayr | 621 | test [temp_bits], TCP_BIT_SENDALOT |
3545 | hidnplayr | 622 | jnz TCP_output.again |
623 | |||
3556 | hidnplayr | 624 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_send: success!\n" |
3545 | hidnplayr | 625 | |
626 | xor eax, eax |
||
627 | ret |
||
628 | |||
629 | |||
630 | .ip_error: |
||
631 | pop ecx |
||
632 | add esp, ecx |
||
633 | add esp, 4 |
||
634 | pop eax |
||
635 | |||
636 | mov [eax + TCP_SOCKET.timer_retransmission], TCP_time_re_min |
||
3602 | hidnplayr | 637 | or [eax + TCP_SOCKET.timer_flags], timer_flag_retransmission |
3545 | hidnplayr | 638 | |
639 | lea ecx, [eax + SOCKET.mutex] |
||
640 | call mutex_unlock |
||
641 | |||
3602 | hidnplayr | 642 | DEBUGF DEBUG_NETWORK_ERROR, "TCP_send: IP error\n" |
3545 | hidnplayr | 643 | |
644 | or eax, -1 |
||
645 | ret |
||
646 | |||
647 | |||
648 | .send_error: |
||
3652 | hidnplayr | 649 | add esp, 4 |
650 | pop eax |
||
3545 | hidnplayr | 651 | |
652 | lea ecx, [eax + SOCKET.mutex] |
||
653 | call mutex_unlock |
||
654 | |||
3602 | hidnplayr | 655 | DEBUGF DEBUG_NETWORK_ERROR, "TCP_send: sending failed\n" |
3545 | hidnplayr | 656 | |
657 | or eax, -2 |
||
658 | ret |
||
659 | |||
660 | |||
4347 | hidnplayr | 661 | endp><><<> |