Rev 2938 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
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1763 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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2362 | hidnplayr | 3 | ;; Copyright (C) KolibriOS team 2004-2012. All rights reserved. ;; |
1763 | hidnplayr | 4 | ;; Distributed under terms of the GNU General Public License ;; |
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: 2940 $ |
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18 | |||
1733 | hidnplayr | 19 | ;----------------------------------------------------------------- |
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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29 | TCP_output: |
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30 | |||
2891 | hidnplayr | 31 | DEBUGF 1,"TCP_output: socket=%x\n", eax |
1733 | hidnplayr | 32 | |
2891 | hidnplayr | 33 | pusha |
34 | lea ecx, [eax + SOCKET.mutex] |
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35 | call mutex_lock |
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36 | popa |
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37 | |||
1733 | hidnplayr | 38 | ; We'll detect the length of the data to be transmitted, and flags to be used |
39 | ; If there is some data, or any critical controls to send (SYN / RST), then transmit |
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40 | ; Otherwise, investigate further |
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41 | |||
2402 | hidnplayr | 42 | mov ebx, [eax + TCP_SOCKET.SND_MAX] |
43 | cmp ebx, [eax + TCP_SOCKET.SND_UNA] |
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44 | jne .not_idle |
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1733 | hidnplayr | 45 | |
2402 | hidnplayr | 46 | mov ebx, [eax + TCP_SOCKET.t_idle] |
47 | cmp ebx, [eax + TCP_SOCKET.t_rxtcur] |
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48 | jbe .not_idle |
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1733 | hidnplayr | 49 | |
50 | ; We have been idle for a while and no ACKS are expected to clock out any data we send.. |
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51 | ; Slow start to get ack "clock" running again. |
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52 | |||
2402 | hidnplayr | 53 | mov ebx, [eax + TCP_SOCKET.t_maxseg] |
54 | mov [eax + TCP_SOCKET.SND_CWND], ebx |
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1733 | hidnplayr | 55 | |
56 | .not_idle: |
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57 | .again: |
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2937 | hidnplayr | 58 | mov [eax + TCP_SOCKET.temp_bits], 0 |
2890 | hidnplayr | 59 | |
2402 | hidnplayr | 60 | mov ebx, [eax + TCP_SOCKET.SND_NXT] ; calculate offset (71) |
61 | sub ebx, [eax + TCP_SOCKET.SND_UNA] ; |
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1733 | hidnplayr | 62 | |
2402 | hidnplayr | 63 | mov ecx, [eax + TCP_SOCKET.SND_WND] ; determine window |
64 | cmp ecx, [eax + TCP_SOCKET.SND_CWND] ; |
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65 | jb @f ; |
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66 | mov ecx, [eax + TCP_SOCKET.SND_CWND] ; |
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67 | @@: ; |
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1733 | hidnplayr | 68 | |
2402 | hidnplayr | 69 | call TCP_outflags ; flags in dl |
1733 | hidnplayr | 70 | |
1761 | hidnplayr | 71 | ;------------------------ |
72 | ; data being forced out ? |
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73 | |||
1733 | hidnplayr | 74 | ; If in persist timeout with window of 0, send 1 byte. |
75 | ; Otherwise, if window is small but nonzero, and timer expired, |
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76 | ; we will send what we can and go to transmit state |
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77 | |||
2402 | hidnplayr | 78 | test [eax + TCP_SOCKET.t_force], -1 |
79 | jz .no_force |
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1733 | hidnplayr | 80 | |
2402 | hidnplayr | 81 | test ecx, ecx |
82 | jnz .no_zero_window |
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1733 | hidnplayr | 83 | |
2402 | hidnplayr | 84 | cmp ebx, [eax + STREAM_SOCKET.snd.size] |
85 | jae @f |
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1733 | hidnplayr | 86 | |
2890 | hidnplayr | 87 | and dl, not (TH_FIN) |
1733 | hidnplayr | 88 | |
89 | @@: |
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2402 | hidnplayr | 90 | inc ecx |
91 | jmp .no_force |
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1733 | hidnplayr | 92 | |
93 | .no_zero_window: |
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2402 | hidnplayr | 94 | mov [eax + TCP_SOCKET.timer_persist], 0 |
95 | mov [eax + TCP_SOCKET.t_rxtshift], 0 |
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1733 | hidnplayr | 96 | |
1761 | hidnplayr | 97 | .no_force: |
1733 | hidnplayr | 98 | |
1761 | hidnplayr | 99 | ;-------------------------------- |
100 | ; Calculate how much data to send (106) |
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1733 | hidnplayr | 101 | |
2402 | hidnplayr | 102 | mov esi, [eax + STREAM_SOCKET.snd.size] |
103 | cmp esi, ecx |
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104 | jb @f |
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105 | mov esi, ecx |
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1733 | hidnplayr | 106 | @@: |
2402 | hidnplayr | 107 | sub esi, ebx |
1733 | hidnplayr | 108 | |
2612 | hidnplayr | 109 | |
1761 | hidnplayr | 110 | ;------------------------ |
111 | ; check for window shrink (107) |
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1733 | hidnplayr | 112 | |
1761 | hidnplayr | 113 | ; If FIN has been set, but not ACKed, but we havent been called to retransmit, esi will be -1 |
1733 | hidnplayr | 114 | ; Otherwise, window shrank after we sent into it. |
115 | |||
2612 | hidnplayr | 116 | jae .not_persist |
1761 | hidnplayr | 117 | |
118 | ; enter persist state |
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2402 | hidnplayr | 119 | xor esi, esi |
1733 | hidnplayr | 120 | |
1761 | hidnplayr | 121 | ; If window shrank to 0 |
2402 | hidnplayr | 122 | test ecx, ecx |
123 | jnz @f |
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1733 | hidnplayr | 124 | |
1761 | hidnplayr | 125 | ; cancel pending retransmit |
2402 | hidnplayr | 126 | mov [eax + TCP_SOCKET.timer_retransmission], 0 |
1733 | hidnplayr | 127 | |
1761 | hidnplayr | 128 | ; pull SND_NXT back to (closed) window, We will enter persist state below. |
2402 | hidnplayr | 129 | push [eax + TCP_SOCKET.SND_UNA] |
130 | pop [eax + TCP_SOCKET.SND_NXT] |
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1733 | hidnplayr | 131 | @@: |
132 | |||
1761 | hidnplayr | 133 | ; If window didn't close completely, just wait for an ACK |
1733 | hidnplayr | 134 | |
2612 | hidnplayr | 135 | .not_persist: |
1733 | hidnplayr | 136 | |
1761 | hidnplayr | 137 | ;--------------------------- |
138 | ; Send one segment at a time (124) |
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139 | |||
2402 | hidnplayr | 140 | cmp esi, [eax + TCP_SOCKET.t_maxseg] |
141 | jbe @f |
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1733 | hidnplayr | 142 | |
2402 | hidnplayr | 143 | mov esi, [eax + TCP_SOCKET.t_maxseg] |
2937 | hidnplayr | 144 | or [eax + TCP_SOCKET.temp_bits], TCP_BIT_SENDALOT |
1733 | hidnplayr | 145 | @@: |
146 | |||
1761 | hidnplayr | 147 | ;-------------------------------------------- |
148 | ; Turn of FIN flag if send buffer not emptied (128) |
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1733 | hidnplayr | 149 | |
2402 | hidnplayr | 150 | mov edi, [eax + TCP_SOCKET.SND_NXT] |
151 | add edi, esi |
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152 | sub edi, [eax + TCP_SOCKET.SND_UNA] |
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2890 | hidnplayr | 153 | cmp edi, [eax + STREAM_SOCKET.snd.size] |
154 | jae @f |
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2402 | hidnplayr | 155 | and dl, not (TH_FIN) |
1733 | hidnplayr | 156 | |
157 | @@: |
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158 | |||
1761 | hidnplayr | 159 | ;------------------------------- |
160 | ; calculate window advertisement (130) |
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1733 | hidnplayr | 161 | |
2402 | hidnplayr | 162 | mov ecx, SOCKET_MAXDATA |
163 | sub ecx, [eax + STREAM_SOCKET.rcv.size] |
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1733 | hidnplayr | 164 | |
165 | ;------------------------------ |
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1761 | hidnplayr | 166 | ; Sender silly window avoidance (131) |
1733 | hidnplayr | 167 | |
2402 | hidnplayr | 168 | test esi, esi |
169 | jz .len_zero |
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1761 | hidnplayr | 170 | |
2402 | hidnplayr | 171 | cmp esi, [eax + TCP_SOCKET.t_maxseg] |
2888 | hidnplayr | 172 | je TCP_send |
1733 | hidnplayr | 173 | |
2890 | hidnplayr | 174 | add ebx, esi ; offset + length |
175 | cmp ebx, [eax + STREAM_SOCKET.snd.size] |
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176 | jb @f |
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177 | |||
2402 | hidnplayr | 178 | test [eax + TCP_SOCKET.t_flags], TF_NODELAY |
2890 | hidnplayr | 179 | jnz TCP_send |
180 | |||
181 | mov ebx, [eax + TCP_SOCKET.SND_MAX] |
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182 | cmp ebx, [eax + TCP_SOCKET.SND_UNA] |
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183 | je TCP_send |
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2362 | hidnplayr | 184 | @@: |
1733 | hidnplayr | 185 | |
2402 | hidnplayr | 186 | test [eax + TCP_SOCKET.t_force], -1 ;;; |
2888 | hidnplayr | 187 | jnz TCP_send |
1733 | hidnplayr | 188 | |
2402 | hidnplayr | 189 | mov ebx, [eax + TCP_SOCKET.max_sndwnd] |
190 | shr ebx, 1 |
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191 | cmp esi, ebx |
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2888 | hidnplayr | 192 | jae TCP_send |
1733 | hidnplayr | 193 | |
2402 | hidnplayr | 194 | mov ebx, [eax + TCP_SOCKET.SND_NXT] |
195 | cmp ebx, [eax + TCP_SOCKET.SND_MAX] |
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2888 | hidnplayr | 196 | jb TCP_send |
1733 | hidnplayr | 197 | |
1761 | hidnplayr | 198 | .len_zero: |
199 | |||
1733 | hidnplayr | 200 | ;---------------------------------------- |
1761 | hidnplayr | 201 | ; Check if a window update should be sent (154) |
1733 | hidnplayr | 202 | |
2402 | hidnplayr | 203 | test ecx, ecx |
204 | jz .no_window |
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1733 | hidnplayr | 205 | |
2402 | hidnplayr | 206 | push ecx |
207 | mov cl, [eax + TCP_SOCKET.RCV_SCALE] |
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208 | inc cl ; we want it *2 |
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209 | mov ebx, TCP_max_win |
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210 | shl ebx, cl |
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211 | pop ecx |
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212 | cmp ebx, ecx |
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213 | cmovb ebx, ecx |
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1733 | hidnplayr | 214 | |
2402 | hidnplayr | 215 | ; now ebx is TWICE the amount we can increase the window |
216 | ; (with TCP_max_win shl rcv_scale as the maximum) |
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2362 | hidnplayr | 217 | |
2402 | hidnplayr | 218 | cmp ebx, [eax + TCP_SOCKET.t_maxseg] |
2888 | hidnplayr | 219 | jae TCP_send |
2362 | hidnplayr | 220 | |
2888 | hidnplayr | 221 | cmp ebx, 8192 ;[eax + TCP_SOCKET.] ;;; FIXME: check with receive buffer high water mark |
222 | jae TCP_send |
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2362 | hidnplayr | 223 | |
1733 | hidnplayr | 224 | .no_window: |
225 | |||
226 | ;-------------------------- |
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1761 | hidnplayr | 227 | ; Should a segment be sent? (174) |
1733 | hidnplayr | 228 | |
2402 | hidnplayr | 229 | test [eax + TCP_SOCKET.t_flags], TF_ACKNOW ; we need to ACK |
2888 | hidnplayr | 230 | jnz TCP_send |
1733 | hidnplayr | 231 | |
2402 | hidnplayr | 232 | test dl, TH_SYN + TH_RST ; we need to send a SYN or RST |
2888 | hidnplayr | 233 | jnz TCP_send |
1733 | hidnplayr | 234 | |
2402 | hidnplayr | 235 | mov ebx, [eax + TCP_SOCKET.SND_UP] ; when urgent pointer is beyond start of send bufer |
236 | cmp ebx, [eax + TCP_SOCKET.SND_UNA] |
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2888 | hidnplayr | 237 | ja TCP_send |
1733 | hidnplayr | 238 | |
2402 | hidnplayr | 239 | test dl, TH_FIN |
240 | jz .enter_persist ; no reason to send, enter persist state |
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1733 | hidnplayr | 241 | |
1761 | hidnplayr | 242 | ; FIN was set, only send if not already sent, or on retransmit |
243 | |||
2402 | hidnplayr | 244 | test [eax + TCP_SOCKET.t_flags], TF_SENTFIN |
2890 | hidnplayr | 245 | jz TCP_send |
1733 | hidnplayr | 246 | |
2402 | hidnplayr | 247 | mov ebx, [eax + TCP_SOCKET.SND_NXT] |
248 | cmp ebx, [eax + TCP_SOCKET.SND_UNA] |
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2888 | hidnplayr | 249 | je TCP_send |
1733 | hidnplayr | 250 | |
251 | ;-------------------- |
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1761 | hidnplayr | 252 | ; Enter persist state (191) |
1733 | hidnplayr | 253 | |
254 | .enter_persist: |
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255 | |||
2402 | hidnplayr | 256 | cmp [eax + STREAM_SOCKET.snd.size], 0 ; Data ready to send? |
257 | jne @f |
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258 | cmp [eax + TCP_SOCKET.timer_retransmission], 0 |
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259 | jne @f |
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260 | cmp [eax + TCP_SOCKET.timer_persist], 0 ; Persist timer already expired? |
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261 | jne @f |
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2362 | hidnplayr | 262 | |
2891 | hidnplayr | 263 | DEBUGF 1,"TCP_output: Entering persist state\n" |
1733 | hidnplayr | 264 | |
2402 | hidnplayr | 265 | mov [eax + TCP_SOCKET.t_rxtshift], 0 |
266 | TCP_set_persist eax |
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2362 | hidnplayr | 267 | @@: |
1733 | hidnplayr | 268 | |
1761 | hidnplayr | 269 | ;---------------------------- |
270 | ; No reason to send a segment (219) |
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271 | |||
2891 | hidnplayr | 272 | DEBUGF 1,"TCP_output: No reason to send a segment\n" |
1733 | hidnplayr | 273 | |
2402 | hidnplayr | 274 | pusha |
275 | lea ecx, [eax + SOCKET.mutex] |
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276 | call mutex_unlock |
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277 | popa |
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1733 | hidnplayr | 278 | |
2402 | hidnplayr | 279 | ret |
1733 | hidnplayr | 280 | |
281 | |||
1761 | hidnplayr | 282 | |
283 | |||
284 | |||
285 | |||
286 | |||
287 | |||
288 | |||
1733 | hidnplayr | 289 | ;----------------------------------------------- |
290 | ; |
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1761 | hidnplayr | 291 | ; Send a segment (222) |
1733 | hidnplayr | 292 | ; |
293 | ; eax = socket pointer |
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1761 | hidnplayr | 294 | ; esi = data len |
1733 | hidnplayr | 295 | ; dl = flags |
296 | ; |
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297 | ;----------------------------------------------- |
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2888 | hidnplayr | 298 | align 4 |
299 | TCP_send: |
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1733 | hidnplayr | 300 | |
2891 | hidnplayr | 301 | DEBUGF 1,"TCP_send: socket=%x length=%u flags=%x\n", eax, esi, dl |
1733 | hidnplayr | 302 | |
2890 | hidnplayr | 303 | push eax ; save socket ptr |
2937 | hidnplayr | 304 | push esi ; and data length too |
2402 | hidnplayr | 305 | mov edi, sizeof.TCP_header ; edi will contain headersize |
1733 | hidnplayr | 306 | |
307 | ;------------------------------------ |
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308 | ; Send options with first SYN segment |
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309 | |||
2402 | hidnplayr | 310 | test dl, TH_SYN |
311 | jz .options_done |
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1733 | hidnplayr | 312 | |
2402 | hidnplayr | 313 | push [eax + TCP_SOCKET.ISS] |
314 | pop [eax + TCP_SOCKET.SND_NXT] |
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1733 | hidnplayr | 315 | |
2402 | hidnplayr | 316 | test [eax + TCP_SOCKET.t_flags], TF_NOOPT |
317 | jnz .options_done |
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1733 | hidnplayr | 318 | |
2402 | hidnplayr | 319 | mov ecx, 1460 ;;;; FIXME |
320 | or ecx, TCP_OPT_MAXSEG shl 24 + 4 shl 16 |
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321 | bswap ecx |
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322 | push ecx |
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323 | add di, 4 |
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1733 | hidnplayr | 324 | |
2402 | hidnplayr | 325 | test [eax + TCP_SOCKET.t_flags], TF_REQ_SCALE |
326 | jz .no_syn |
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1733 | hidnplayr | 327 | |
2402 | hidnplayr | 328 | test dl, TH_ACK |
329 | jnz .scale_opt |
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1733 | hidnplayr | 330 | |
2402 | hidnplayr | 331 | test [eax + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
332 | jz .no_syn |
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1733 | hidnplayr | 333 | |
334 | .scale_opt: |
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2402 | hidnplayr | 335 | movzx ecx, byte [eax + TCP_SOCKET.request_r_scale] |
336 | or ecx, TCP_OPT_WINDOW shl 24 + 4 shl 16 + TCP_OPT_NOP shl 8 |
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337 | bswap ecx |
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338 | pushd ecx |
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339 | add di, 4 |
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1733 | hidnplayr | 340 | |
341 | .no_syn: |
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342 | |||
343 | ;------------------------------------ |
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344 | ; Make the timestamp option if needed |
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345 | |||
2402 | hidnplayr | 346 | test [eax + TCP_SOCKET.t_flags], TF_REQ_TSTMP |
347 | jz .no_timestamp |
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1733 | hidnplayr | 348 | |
2402 | hidnplayr | 349 | test dl, TH_RST |
350 | jnz .no_timestamp |
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1733 | hidnplayr | 351 | |
2402 | hidnplayr | 352 | test dl, TH_ACK |
353 | jz .timestamp |
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1733 | hidnplayr | 354 | |
2402 | hidnplayr | 355 | test [eax + TCP_SOCKET.t_flags], TF_RCVD_TSTMP |
356 | jz .no_timestamp |
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1733 | hidnplayr | 357 | |
358 | .timestamp: |
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2402 | hidnplayr | 359 | mov ebx, [timer_ticks] |
360 | bswap ebx |
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361 | push ebx |
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362 | pushw 0 |
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363 | pushd TCP_OPT_TIMESTAMP + 10 shl 8 + TCP_OPT_NOP shl 16 + TCP_OPT_NOP shl 24 |
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364 | add di, 10 |
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1733 | hidnplayr | 365 | |
366 | .no_timestamp: |
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367 | |||
2402 | hidnplayr | 368 | ; |
1733 | hidnplayr | 369 | |
1761 | hidnplayr | 370 | .options_done: |
371 | |||
372 | ; eax = socket ptr |
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373 | ; edx = flags |
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374 | ; edi = header size |
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375 | ; esi = data len |
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376 | |||
377 | ;--------------------------------------------- |
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378 | ; check if we dont exceed the max segment size (270) |
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379 | |||
2402 | hidnplayr | 380 | add esi, edi ; total TCP segment size |
381 | cmp esi, [eax + TCP_SOCKET.t_maxseg] |
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382 | jbe .no_overflow |
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1761 | hidnplayr | 383 | |
2402 | hidnplayr | 384 | mov esi, [eax + TCP_SOCKET.t_maxseg] |
2937 | hidnplayr | 385 | or [eax + TCP_SOCKET.temp_bits], TCP_BIT_SENDALOT |
1761 | hidnplayr | 386 | .no_overflow: |
387 | |||
388 | ;----------------------------------------------------------------- |
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1733 | hidnplayr | 389 | ; Start by pushing all TCP header values in reverse order on stack |
1761 | hidnplayr | 390 | ; (essentially, creating the tcp header on the stack!) |
1733 | hidnplayr | 391 | |
2402 | hidnplayr | 392 | pushw 0 ; .UrgentPointer dw ? |
393 | pushw 0 ; .Checksum dw ? |
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2888 | hidnplayr | 394 | pushw 0x00a0 ; .Window dw ? ;;;;;;; FIXME (370) |
2402 | hidnplayr | 395 | shl edi, 2 ; .DataOffset db ? only 4 left-most bits |
396 | shl dx, 8 |
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397 | or dx, di ; .Flags db ? |
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398 | pushw dx |
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2888 | hidnplayr | 399 | shr edi, 2 ; .DataOffset db ? |
1733 | hidnplayr | 400 | |
2402 | hidnplayr | 401 | push [eax + TCP_SOCKET.RCV_NXT] ; .AckNumber dd ? |
402 | ntohd [esp] |
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1733 | hidnplayr | 403 | |
2402 | hidnplayr | 404 | push [eax + TCP_SOCKET.SND_NXT] ; .SequenceNumber dd ? |
405 | ntohd [esp] |
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1733 | hidnplayr | 406 | |
2402 | hidnplayr | 407 | push [eax + TCP_SOCKET.RemotePort] ; .DestinationPort dw ? |
408 | ntohw [esp] |
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1733 | hidnplayr | 409 | |
2402 | hidnplayr | 410 | push [eax + TCP_SOCKET.LocalPort] ; .SourcePort dw ? |
411 | ntohw [esp] |
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1733 | hidnplayr | 412 | |
2890 | hidnplayr | 413 | push edi ; header size |
1733 | hidnplayr | 414 | |
1761 | hidnplayr | 415 | ;--------------------- |
1733 | hidnplayr | 416 | ; Create the IP packet |
1761 | hidnplayr | 417 | |
2402 | hidnplayr | 418 | mov ecx, esi |
1761 | hidnplayr | 419 | |
2877 | hidnplayr | 420 | mov ebx, [eax + SOCKET.device] |
421 | mov edx, [eax + IP_SOCKET.LocalIP] ; source ip |
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2402 | hidnplayr | 422 | mov eax, [eax + IP_SOCKET.RemoteIP] ; dest ip |
423 | mov di, IP_PROTO_TCP shl 8 + 128 |
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424 | call IPv4_output |
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2555 | hidnplayr | 425 | jz .ip_error |
1733 | hidnplayr | 426 | |
427 | ;----------------------------------------- |
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428 | ; Move TCP header from stack to TCP packet |
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429 | |||
2402 | hidnplayr | 430 | push ecx |
2890 | hidnplayr | 431 | mov ecx, [esp + 4] |
432 | lea esi, [esp + 8] |
||
433 | shr ecx, 2 ; count is in bytes, we will work with dwords |
||
2402 | hidnplayr | 434 | rep movsd |
2890 | hidnplayr | 435 | pop ecx ; full TCP packet size |
1733 | hidnplayr | 436 | |
2890 | hidnplayr | 437 | pop esi ; headersize |
438 | add esp, esi ; remove it from stack |
||
1733 | hidnplayr | 439 | |
2890 | hidnplayr | 440 | push edx ; packet size for send proc |
441 | push eax ; packet ptr for send proc |
||
1733 | hidnplayr | 442 | |
2402 | hidnplayr | 443 | mov edx, edi ; begin of data |
444 | sub edx, esi ; begin of packet (edi = begin of data) |
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445 | push ecx |
||
446 | sub ecx, esi ; data size |
||
1733 | hidnplayr | 447 | |
448 | ;-------------- |
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449 | ; Copy the data |
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450 | |||
451 | ; eax = ptr to ring struct |
||
452 | ; ecx = buffer size |
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453 | ; edi = ptr to buffer |
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454 | |||
2937 | hidnplayr | 455 | mov eax, [esp + 16] ; get socket ptr |
1761 | hidnplayr | 456 | |
2888 | hidnplayr | 457 | push edx |
2937 | hidnplayr | 458 | push [eax + TCP_SOCKET.SND_NXT] ; we'll need this for timing the transmission |
2888 | hidnplayr | 459 | test ecx, ecx |
460 | jz .nodata |
||
2893 | hidnplayr | 461 | mov edx, [eax + TCP_SOCKET.SND_NXT] |
2937 | hidnplayr | 462 | add [eax + TCP_SOCKET.SND_NXT], ecx ; update sequence number <<< CHECKME |
463 | sub edx, [eax + TCP_SOCKET.SND_UNA] ; offset |
||
2402 | hidnplayr | 464 | add eax, STREAM_SOCKET.snd |
465 | call SOCKET_ring_read |
||
2888 | hidnplayr | 466 | .nodata: |
2937 | hidnplayr | 467 | pop edi |
2402 | hidnplayr | 468 | pop esi ; begin of data |
469 | pop ecx ; full packet size |
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2938 | hidnplayr | 470 | mov eax, [esp + 12] ; socket ptr |
1733 | hidnplayr | 471 | |
1761 | hidnplayr | 472 | ;---------------------------------- |
2937 | hidnplayr | 473 | ; initialize retransmit timer (400) |
1761 | hidnplayr | 474 | |
2937 | hidnplayr | 475 | ;TODO: check t_force and persist |
476 | |||
477 | test [esi + TCP_header.Flags], TH_SYN + TH_FIN ; syn and fin take a sequence number |
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2402 | hidnplayr | 478 | jz @f |
2937 | hidnplayr | 479 | inc [eax + TCP_SOCKET.SND_NXT] |
2402 | hidnplayr | 480 | test [esi + TCP_header.Flags], TH_FIN |
481 | jz @f |
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2937 | hidnplayr | 482 | or [eax + TCP_SOCKET.t_flags], TF_SENTFIN ; if we sent a fin, set the sentfin flag |
1733 | hidnplayr | 483 | @@: |
484 | |||
2402 | hidnplayr | 485 | mov edx, [eax + TCP_SOCKET.SND_NXT] |
2937 | hidnplayr | 486 | cmp edx, [eax + TCP_SOCKET.SND_MAX] ; is this a retransmission? |
2402 | hidnplayr | 487 | jbe @f |
2937 | hidnplayr | 488 | mov [eax + TCP_SOCKET.SND_MAX], edx ; [eax + TCP_SOCKET.SND_NXT] from before we updated it |
1733 | hidnplayr | 489 | |
2937 | hidnplayr | 490 | cmp [eax + TCP_SOCKET.t_rtt], 0 ; are we currently timing anything? |
491 | je @f |
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492 | mov [eax + TCP_SOCKET.t_rtt], 1 ; nope, start transmission timer |
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493 | mov [eax + TCP_SOCKET.t_rtseq], edi |
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494 | ;TODO: update stats |
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1733 | hidnplayr | 495 | @@: |
496 | |||
1761 | hidnplayr | 497 | ; set retransmission timer if not already set, and not doing an ACK or keepalive probe |
1733 | hidnplayr | 498 | |
2937 | hidnplayr | 499 | cmp [eax + TCP_SOCKET.timer_retransmission], 0 ;;;; FIXME |
500 | ja .retransmit_set |
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1761 | hidnplayr | 501 | |
2937 | hidnplayr | 502 | cmp edx, [eax + TCP_SOCKET.SND_UNA] ; edx is still [eax + TCP_SOCKET.SND_NXT] |
2402 | hidnplayr | 503 | je .retransmit_set |
1761 | hidnplayr | 504 | |
2402 | hidnplayr | 505 | mov edx, [eax + TCP_SOCKET.t_rxtcur] |
506 | mov [eax + TCP_SOCKET.timer_retransmission], dx |
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1761 | hidnplayr | 507 | |
2402 | hidnplayr | 508 | cmp [eax + TCP_SOCKET.timer_persist], 0 |
2890 | hidnplayr | 509 | jne .retransmit_set |
2402 | hidnplayr | 510 | mov [eax + TCP_SOCKET.timer_persist], 0 |
511 | mov [eax + TCP_SOCKET.t_rxtshift], 0 |
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1761 | hidnplayr | 512 | |
513 | .retransmit_set: |
||
514 | |||
1733 | hidnplayr | 515 | ;-------------------- |
516 | ; Create the checksum |
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517 | |||
2402 | hidnplayr | 518 | TCP_checksum (eax + IP_SOCKET.LocalIP), (eax + IP_SOCKET.RemoteIP) |
519 | mov [esi + TCP_header.Checksum], dx |
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1733 | hidnplayr | 520 | |
2940 | hidnplayr | 521 | ; unlock socket |
522 | lea ecx, [eax + SOCKET.mutex] |
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523 | call mutex_unlock |
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524 | |||
1733 | hidnplayr | 525 | ;---------------- |
526 | ; Send the packet |
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527 | |||
2891 | hidnplayr | 528 | DEBUGF 1,"TCP_send: Sending with device %x\n", ebx |
2402 | hidnplayr | 529 | call [ebx + NET_DEVICE.transmit] |
2890 | hidnplayr | 530 | jnz .send_error |
2937 | hidnplayr | 531 | |
532 | ;--------------- |
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533 | ; Ok, data sent! |
||
534 | |||
535 | pop ecx |
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2890 | hidnplayr | 536 | pop eax |
537 | |||
538 | inc [TCP_segments_tx] ; FIXME: correct interface? |
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539 | |||
2940 | hidnplayr | 540 | ; unlock socket |
541 | lea ecx, [eax + SOCKET.mutex] |
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542 | call mutex_lock |
||
543 | |||
2937 | hidnplayr | 544 | ; update advertised receive window |
545 | test ecx, ecx |
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546 | jz @f |
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547 | add ecx, [eax + TCP_SOCKET.RCV_NXT] |
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548 | cmp ecx, [eax + TCP_SOCKET.RCV_ADV] |
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549 | jbe @f |
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550 | mov [eax + TCP_SOCKET.RCV_ADV], ecx |
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551 | @@: |
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2890 | hidnplayr | 552 | |
2937 | hidnplayr | 553 | ; update last ack sent |
2890 | hidnplayr | 554 | push [eax + TCP_SOCKET.RCV_NXT] |
555 | pop [eax + TCP_SOCKET.last_ack_sent] |
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556 | |||
2937 | hidnplayr | 557 | ; and flags |
2890 | hidnplayr | 558 | and [eax + TCP_SOCKET.t_flags], not (TF_ACKNOW + TF_DELACK) |
559 | |||
2937 | hidnplayr | 560 | test [eax + TCP_SOCKET.temp_bits], TCP_BIT_SENDALOT |
561 | jnz TCP_output.again |
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2890 | hidnplayr | 562 | |
563 | ; unlock socket |
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564 | lea ecx, [eax + SOCKET.mutex] |
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565 | call mutex_unlock |
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2932 | hidnplayr | 566 | |
2891 | hidnplayr | 567 | DEBUGF 1,"TCP_send: success!\n" |
2890 | hidnplayr | 568 | |
569 | xor eax, eax |
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2402 | hidnplayr | 570 | ret |
1733 | hidnplayr | 571 | |
572 | |||
2555 | hidnplayr | 573 | .ip_error: |
2402 | hidnplayr | 574 | pop ecx |
575 | add esp, ecx |
||
2937 | hidnplayr | 576 | add esp, 4 |
2402 | hidnplayr | 577 | pop eax |
1733 | hidnplayr | 578 | |
2629 | hidnplayr | 579 | mov [eax + TCP_SOCKET.timer_retransmission], TCP_time_re_min |
580 | |||
2890 | hidnplayr | 581 | ; unlock socket |
2402 | hidnplayr | 582 | lea ecx, [eax + SOCKET.mutex] |
583 | call mutex_unlock |
||
2932 | hidnplayr | 584 | |
2891 | hidnplayr | 585 | DEBUGF 1,"TCP_send: IP error\n" |
1733 | hidnplayr | 586 | |
2890 | hidnplayr | 587 | or eax, -1 |
2402 | hidnplayr | 588 | ret |
589 | |||
2890 | hidnplayr | 590 | .send_error: |
2940 | hidnplayr | 591 | add esp, 8 |
2937 | hidnplayr | 592 | |
2891 | hidnplayr | 593 | DEBUGF 1,"TCP_send: sending failed\n" |
2402 | hidnplayr | 594 | |
2890 | hidnplayr | 595 | or eax, -2 |
596 | ret><><<> |
||
2888 | hidnplayr | 597 |