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1763 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; Copyright (C) KolibriOS team 2004-2011. 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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1733 | hidnplayr | 16 | |
1763 | hidnplayr | 17 | $Revision: 1763 $ |
1733 | hidnplayr | 18 | |
19 | macro TCP_checksum IP1, IP2 { |
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20 | |||
21 | ;------------- |
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22 | ; Pseudoheader |
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23 | |||
24 | ; protocol type |
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25 | mov edx, IP_PROTO_TCP |
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26 | |||
27 | ; source address |
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28 | add dl, byte [IP1+1] |
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29 | adc dh, byte [IP1+0] |
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30 | adc dl, byte [IP1+3] |
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31 | adc dh, byte [IP1+2] |
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32 | |||
33 | ; destination address |
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34 | adc dl, byte [IP2+1] |
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35 | adc dh, byte [IP2+0] |
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36 | adc dl, byte [IP2+3] |
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37 | adc dh, byte [IP2+2] |
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38 | |||
39 | ; size |
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40 | adc dl, cl |
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41 | adc dh, ch |
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42 | |||
43 | ;--------------------- |
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44 | ; Real header and data |
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45 | |||
46 | push esi |
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47 | call checksum_1 |
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48 | call checksum_2 |
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49 | pop esi |
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50 | |||
51 | } ; returns in dx only |
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52 | |||
53 | |||
54 | |||
55 | |||
56 | macro TCP_sendseqinit ptr { |
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57 | |||
58 | push edi ;;;; i dont like this static use of edi |
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59 | mov edi, [ptr + TCP_SOCKET.ISS] |
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60 | mov [ptr + TCP_SOCKET.SND_UP], edi |
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61 | mov [ptr + TCP_SOCKET.SND_MAX], edi |
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62 | mov [ptr + TCP_SOCKET.SND_NXT], edi |
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63 | mov [ptr + TCP_SOCKET.SND_UNA], edi |
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64 | pop edi |
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65 | |||
66 | } |
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67 | |||
68 | |||
69 | |||
70 | macro TCP_rcvseqinit ptr { |
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71 | |||
72 | push edi |
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73 | mov edi, [ptr + TCP_SOCKET.IRS] |
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74 | inc edi |
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75 | mov [ptr + TCP_SOCKET.RCV_NXT], edi |
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76 | mov [ptr + TCP_SOCKET.RCV_ADV], edi |
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77 | pop edi |
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78 | |||
79 | } |
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80 | |||
81 | |||
82 | |||
83 | |||
84 | |||
85 | |||
86 | |||
87 | |||
88 | |||
89 | |||
90 | ;--------------------------- |
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91 | ; |
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92 | ; TCP_pull_out_of_band |
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93 | ; |
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94 | ; IN: eax = |
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95 | ; ebx = socket ptr |
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96 | ; edx = tcp packet ptr |
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97 | ; |
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98 | ; OUT: / |
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99 | ; |
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100 | ;--------------------------- |
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101 | |||
102 | align 4 |
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103 | TCP_pull_out_of_band: |
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104 | |||
105 | DEBUGF 1,"TCP_pull_out_of_band\n" |
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106 | |||
107 | ;;;; 1282-1305 |
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108 | |||
109 | ret |
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110 | |||
111 | |||
112 | |||
113 | |||
114 | |||
115 | |||
116 | |||
117 | |||
118 | ;------------------------- |
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119 | ; |
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120 | ; TCP_drop |
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121 | ; |
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122 | ; IN: eax = socket ptr |
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123 | ; ebx = error number |
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124 | ; |
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125 | ; OUT: eax = socket ptr |
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126 | ; |
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127 | ;------------------------- |
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128 | align 4 |
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129 | TCP_drop: |
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130 | |||
131 | DEBUGF 1,"TCP_drop\n" |
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132 | |||
133 | cmp [eax + TCP_SOCKET.t_state], TCB_SYN_RECEIVED |
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134 | jl .no_syn_received |
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135 | |||
136 | mov [eax + TCP_SOCKET.t_state], TCB_CLOSED |
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137 | |||
138 | call TCP_output |
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139 | |||
140 | ;;; TODO: update stats |
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141 | |||
142 | jmp TCP_close |
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143 | |||
144 | .no_syn_received: |
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145 | |||
146 | ;;; TODO: update stats |
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147 | |||
148 | ;;; TODO: check if error code is "Connection timed out' and handle accordingly |
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149 | |||
150 | mov [eax + SOCKET.errorcode], ebx |
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151 | |||
152 | |||
153 | |||
154 | |||
155 | |||
156 | |||
157 | |||
158 | |||
159 | ;------------------------- |
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160 | ; |
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161 | ; TCP_close |
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162 | ; |
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163 | ; IN: eax = socket ptr |
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164 | ; OUT: eax = socket ptr |
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165 | ; |
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166 | ;------------------------- |
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167 | align 4 |
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168 | TCP_close: |
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169 | |||
170 | DEBUGF 1,"TCP_close\n" |
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171 | |||
172 | ;;; TODO: update RTT and mean deviation |
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173 | ;;; TODO: update slow start threshold |
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174 | ;;; TODO: release connection resources |
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175 | |||
176 | ; Now, mark the socket as being disconnected |
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177 | |||
178 | mov [eax + SOCKET.state], 0 ;;; FIXME |
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179 | |||
180 | ret |
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181 | |||
182 | |||
183 | |||
184 | |||
185 | |||
186 | |||
187 | |||
188 | |||
189 | |||
190 | |||
191 | ;------------------------- |
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192 | ; |
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193 | ; TCP_outflags |
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194 | ; |
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195 | ; IN: eax = socket ptr |
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196 | ; |
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197 | ; OUT: edx = flags |
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198 | ; |
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199 | ;------------------------- |
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200 | align 4 |
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201 | TCP_outflags: |
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202 | |||
203 | mov edx, [eax + TCP_SOCKET.t_state] |
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204 | movzx edx, byte [edx + .flaglist] |
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205 | |||
206 | DEBUGF 1,"TCP_outflags, socket: %x, flags: %x\n", eax, dl |
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207 | |||
208 | ret |
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209 | |||
210 | .flaglist: |
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211 | |||
212 | db TH_RST + TH_ACK ; TCB_CLOSED |
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213 | db 0 ; TCB_LISTEN |
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214 | db TH_SYN ; TCB_SYN_SENT |
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215 | db TH_SYN + TH_ACK ; TCB_SYN_RECEIVED |
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216 | db TH_ACK ; TCB_ESTABLISHED |
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217 | db TH_ACK ; TCB_CLOSE_WAIT |
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218 | db TH_SYN + TH_ACK ; TCB_FIN_WAIT_1 |
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219 | db TH_SYN + TH_ACK ; TCB_CLOSING |
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220 | db TH_SYN + TH_ACK ; TCB_LAST_ACK |
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221 | db TH_ACK ; TCB_FIN_WAIT_2 |
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222 | db TH_ACK ; TCB_TIMED_WAIT |
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223 | |||
224 | |||
225 | |||
226 | |||
227 | |||
228 | |||
229 | ;--------------------------------------- |
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230 | ; |
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231 | ; The easy way to send an ACK/RST/keepalive segment |
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232 | ; |
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233 | ; TCP_respond_socket: |
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234 | ; |
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235 | ; IN: ebx = socket ptr |
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236 | ; cl = flags |
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237 | ; |
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238 | ;-------------------------------------- |
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239 | align 4 |
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240 | TCP_respond_socket: |
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241 | |||
242 | DEBUGF 1,"TCP_respond_socket\n" |
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243 | |||
244 | ;--------------------- |
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245 | ; Create the IP packet |
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246 | |||
247 | push cx ebx |
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248 | mov eax, [ebx + IP_SOCKET.RemoteIP] |
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249 | mov ebx, [ebx + IP_SOCKET.LocalIP] |
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250 | mov ecx, TCP_segment.Data |
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251 | mov di , IP_PROTO_TCP shl 8 + 128 |
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252 | call IPv4_output |
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253 | test edi, edi |
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254 | jz .error |
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255 | pop esi cx |
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256 | push edx eax |
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257 | |||
258 | ;----------------------------------------------- |
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259 | ; Fill in the TCP header by using the socket ptr |
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260 | |||
261 | mov ax, [esi + TCP_SOCKET.LocalPort] |
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262 | rol ax, 8 |
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263 | stosw |
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264 | mov ax, [esi + TCP_SOCKET.RemotePort] |
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265 | rol ax, 8 |
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266 | stosw |
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267 | mov eax, [esi + TCP_SOCKET.SND_NXT] |
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268 | bswap eax |
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269 | stosd |
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270 | mov eax, [esi + TCP_SOCKET.RCV_NXT] |
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271 | bswap eax |
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272 | stosd |
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273 | mov al, 0x50 ; Dataoffset: 20 bytes |
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274 | stosb |
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275 | mov al, cl |
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276 | stosb |
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277 | mov ax, [esi + TCP_SOCKET.RCV_WND] |
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278 | rol ax, 8 |
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279 | stosw ; window |
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280 | xor eax, eax |
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281 | stosd ; checksum + urgentpointer |
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282 | |||
283 | ;--------------------- |
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284 | ; Fill in the checksum |
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285 | |||
286 | .checksum: |
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287 | sub edi, TCP_segment.Data |
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288 | mov ecx, TCP_segment.Data |
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289 | xchg esi, edi |
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290 | TCP_checksum (edi + IP_SOCKET.LocalIP), (esi + IP_SOCKET.RemoteIP) |
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291 | mov [esi+TCP_segment.Checksum], dx |
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292 | |||
293 | ;-------------------- |
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294 | ; And send the segment |
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295 | |||
296 | call [ebx + NET_DEVICE.transmit] |
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297 | ret |
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298 | |||
299 | .error: |
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300 | DEBUGF 1,"TCP_respond failed\n" |
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301 | add esp, 2+4 |
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302 | |||
303 | ret |
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304 | |||
305 | |||
306 | |||
307 | |||
308 | |||
309 | |||
310 | |||
311 | |||
312 | ;------------------------- |
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313 | ; TCP_respond.segment: |
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314 | ; |
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315 | ; IN: edx = segment ptr (a previously received segment) |
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316 | ; cl = flags |
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317 | |||
318 | align 4 |
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319 | TCP_respond_segment: |
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320 | |||
321 | DEBUGF 1,"TCP_respond_segment\n" |
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322 | |||
323 | ;--------------------- |
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324 | ; Create the IP packet |
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325 | |||
326 | push cx edx |
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327 | mov ebx, [edx - 20 + IPv4_Packet.SourceAddress] ;;;; and what if ip packet had options?! |
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328 | mov eax, [edx - 20 + IPv4_Packet.DestinationAddress] ;;; |
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329 | mov ecx, TCP_segment.Data |
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330 | mov di , IP_PROTO_TCP shl 8 + 128 |
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331 | call IPv4_output |
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332 | jz .error |
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333 | pop esi cx |
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334 | |||
335 | push edx eax |
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336 | |||
337 | ;--------------------------------------------------- |
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338 | ; Fill in the TCP header by using a received segment |
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339 | |||
340 | mov ax, [esi + TCP_segment.DestinationPort] |
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341 | rol ax, 8 |
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342 | stosw |
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343 | mov ax, [esi + TCP_segment.SourcePort] |
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344 | rol ax, 8 |
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345 | stosw |
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346 | mov eax, [esi + TCP_segment.AckNumber] |
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347 | bswap eax |
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348 | stosd |
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349 | xor eax, eax |
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350 | stosd |
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351 | mov al, 0x50 ; Dataoffset: 20 bytes |
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352 | stosb |
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353 | mov al, cl |
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354 | stosb |
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355 | mov ax, 1280 |
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356 | rol ax, 8 |
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357 | stosw ; window |
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358 | xor eax, eax |
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359 | stosd ; checksum + urgentpointer |
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360 | |||
361 | ;--------------------- |
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362 | ; Fill in the checksum |
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363 | |||
364 | .checksum: |
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365 | lea esi, [edi - TCP_segment.Data] |
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366 | mov ecx, TCP_segment.Data |
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367 | TCP_checksum (esi - 20 + IPv4_Packet.DestinationAddress), (esi - 20 + IPv4_Packet.DestinationAddress) |
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368 | mov [esi+TCP_segment.Checksum], dx |
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369 | |||
370 | ;-------------------- |
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371 | ; And send the segment |
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372 | |||
373 | call [ebx + NET_DEVICE.transmit] |
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374 | ret |
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375 | |||
376 | .error: |
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377 | DEBUGF 1,"TCP_respond failed\n" |
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378 | add esp, 2+4 |
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379 | |||
380 | ret |