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4429 | Serge | 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: 3407 $ |
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18 | |||
19 | ;----------------------------------------------------------------- |
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20 | ; |
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21 | ; TCP_input: |
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22 | ; |
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23 | ; Add a segment to the incoming TCP queue |
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24 | ; |
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25 | ; IN: [esp] = ptr to buffer |
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26 | ; [esp+4] = buffer size (dont care) |
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27 | ; ebx = ptr to device struct |
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28 | ; ecx = segment size |
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29 | ; esi = ptr to TCP segment |
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30 | ; edi = ptr to ipv4 source address, followed by ipv4 dest address |
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31 | ; |
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32 | ; OUT: / |
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33 | ; |
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34 | ;----------------------------------------------------------------- |
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35 | |||
36 | align 4 |
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37 | TCP_input: |
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38 | |||
39 | ; record the current time |
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40 | mov eax, [timer_ticks] ; in 1/100 seconds |
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41 | mov [esp + 4], eax |
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42 | |||
43 | push ebx ecx esi edi ; mind the order |
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44 | mov esi, esp |
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45 | |||
46 | add_to_queue TCP_queue, TCP_QUEUE_SIZE, sizeof.TCP_queue_entry, .fail |
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47 | add esp, sizeof.TCP_queue_entry |
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48 | |||
49 | call NET_ptr_to_num4 |
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50 | inc [TCP_segments_rx + edi] |
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51 | |||
52 | xor edx, edx |
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53 | mov eax, [TCP_input_event] |
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54 | mov ebx, [eax + EVENT.id] |
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55 | xor esi, esi |
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56 | call raise_event |
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57 | |||
58 | ret |
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59 | |||
60 | .fail: |
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61 | popf |
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62 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP incoming queue is full, discarding packet!\n" |
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63 | |||
64 | call NET_ptr_to_num4 |
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65 | inc [TCP_segments_missed + edi] |
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66 | |||
67 | add esp, sizeof.TCP_queue_entry - 8 |
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68 | call NET_packet_free |
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69 | add esp, 4 |
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70 | |||
71 | ret |
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72 | |||
73 | |||
74 | |||
75 | |||
76 | align 4 |
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77 | proc TCP_process_input |
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78 | |||
79 | locals |
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80 | dataoffset dd ? |
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81 | timestamp dd ? |
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82 | temp_bits db ? |
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83 | endl |
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84 | |||
85 | xor esi, esi |
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86 | mov ecx, MANUAL_DESTROY |
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87 | call create_event |
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88 | mov [TCP_input_event], eax |
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89 | |||
90 | .wait: |
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91 | mov eax, [TCP_input_event] |
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92 | mov ebx, [eax + EVENT.id] |
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93 | call wait_event |
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94 | |||
95 | .loop: |
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96 | get_from_queue TCP_queue, TCP_QUEUE_SIZE, sizeof.TCP_queue_entry, .wait |
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97 | |||
98 | push [esi + TCP_queue_entry.timestamp] |
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99 | pop [timestamp] |
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100 | push [esi + TCP_queue_entry.buffer_ptr] |
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101 | |||
102 | mov ebx, [esi + TCP_queue_entry.device_ptr] |
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103 | mov ecx, [esi + TCP_queue_entry.segment_size] |
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104 | mov edi, [esi + TCP_queue_entry.ip_ptr] ; ptr to ipv4 source address, followed by ipv4 destination address |
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105 | mov esi, [esi + TCP_queue_entry.segment_ptr] ; change esi last |
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106 | |||
107 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: size=%u time=%d\n", ecx, [timer_ticks] |
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108 | |||
109 | mov edx, esi |
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110 | |||
111 | cmp ebx, LOOPBACK_DEVICE |
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112 | je .checksum_ok |
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113 | |||
114 | ; re-calculate the checksum (if not already done by hw) |
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115 | test [ebx + NET_DEVICE.hwacc], NET_HWACC_TCP_IPv4_IN |
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116 | jnz .checksum_ok |
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117 | |||
118 | push ecx esi |
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119 | pushw [esi + TCP_header.Checksum] |
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120 | mov [esi + TCP_header.Checksum], 0 |
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121 | TCP_checksum (edi), (edi+4) |
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122 | pop cx ; previous checksum |
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123 | cmp cx, dx |
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124 | pop edx ecx |
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125 | jne .drop_no_socket |
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126 | .checksum_ok: |
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127 | |||
128 | ; Verify the data offset |
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129 | movzx eax, [edx + TCP_header.DataOffset] |
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130 | and al, 0xf0 ; Calculate TCP segment header size (throwing away unused reserved bits in TCP header) |
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131 | shr al, 2 |
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132 | cmp al, sizeof.TCP_header ; Now see if it's at least the size of a standard TCP header |
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133 | jb .drop_no_socket ; If not, drop the packet |
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134 | mov [dataoffset], eax |
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135 | |||
136 | sub ecx, eax ; substract TCP header size from total segment size |
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137 | jb .drop_no_socket ; If total segment size is less then the advertised header size, drop packet |
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138 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: %u bytes of data\n", ecx |
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139 | |||
140 | ;------------------------------------------- |
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141 | ; Convert Big-endian values to little endian |
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142 | |||
143 | ntohd [edx + TCP_header.SequenceNumber] |
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144 | ntohd [edx + TCP_header.AckNumber] |
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145 | |||
146 | ntohw [edx + TCP_header.Window] |
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147 | ntohw [edx + TCP_header.UrgentPointer] |
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148 | |||
149 | ;------------------------ |
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150 | ; Find the socket pointer |
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151 | |||
152 | ; IP Packet TCP Destination Port = local Port |
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153 | ; (IP Packet SenderAddress = Remote IP) OR (Remote IP = 0) |
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154 | ; (IP Packet TCP Source Port = remote Port) OR (remote Port = 0) |
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155 | |||
156 | .findpcb: |
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157 | pusha |
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158 | mov ecx, socket_mutex |
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159 | call mutex_lock |
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160 | popa |
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161 | |||
162 | mov ebx, net_sockets |
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163 | mov si, [edx + TCP_header.DestinationPort] |
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164 | |||
165 | .socket_loop: |
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166 | mov ebx, [ebx + SOCKET.NextPtr] |
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167 | or ebx, ebx |
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168 | jz .no_socket ;respond_seg_reset |
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169 | |||
170 | cmp [ebx + SOCKET.Domain], AF_INET4 |
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171 | jne .socket_loop |
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172 | |||
173 | cmp [ebx + SOCKET.Protocol], IP_PROTO_TCP |
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174 | jne .socket_loop |
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175 | |||
176 | cmp [ebx + TCP_SOCKET.LocalPort], si |
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177 | jne .socket_loop |
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178 | |||
179 | mov eax, [ebx + IP_SOCKET.RemoteIP] |
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180 | cmp eax, [edi] ; Ipv4 source address |
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181 | je @f |
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182 | test eax, eax |
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183 | jnz .socket_loop |
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184 | @@: |
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185 | |||
186 | mov ax, [ebx + TCP_SOCKET.RemotePort] |
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187 | cmp [edx + TCP_header.SourcePort], ax |
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188 | je .found_socket |
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189 | test ax, ax |
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190 | jnz .socket_loop |
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191 | .found_socket: ; ebx now contains the socketpointer |
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192 | pusha |
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193 | mov ecx, socket_mutex |
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194 | call mutex_unlock |
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195 | popa |
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196 | |||
197 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: socket ptr=%x state=%u flags=%x\n", ebx, [ebx + TCP_SOCKET.t_state], [edx + TCP_header.Flags]:2 |
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198 | |||
199 | ;---------------------------- |
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200 | ; Check if socket isnt closed |
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201 | |||
202 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
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203 | je .drop_no_socket |
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204 | |||
205 | ;---------------- |
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206 | ; Lock the socket |
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207 | |||
208 | pusha |
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209 | lea ecx, [ebx + SOCKET.mutex] |
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210 | call mutex_lock |
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211 | popa |
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212 | |||
213 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: socket locked\n" |
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214 | |||
215 | ;--------------------------- |
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216 | ; disable all temporary bits |
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217 | |||
218 | mov [temp_bits], 0 |
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219 | |||
220 | ;--------------------------------------- |
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221 | ; unscale the window into a 32 bit value |
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222 | |||
223 | movzx eax, [edx + TCP_header.Window] |
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224 | push ecx |
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225 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
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226 | shl eax, cl |
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227 | mov dword [edx + TCP_header.Window], eax ; word after window is checksum, we dont need checksum anymore |
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228 | pop ecx |
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229 | |||
230 | ;--------------------------------------- |
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231 | ; Are we accepting incoming connections? |
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232 | |||
233 | test [ebx + SOCKET.options], SO_ACCEPTCON |
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234 | jz .no_accept |
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235 | |||
236 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Accepting new connection\n" |
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237 | |||
238 | pusha |
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239 | lea ecx, [ebx + SOCKET.mutex] |
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240 | call mutex_unlock |
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241 | popa |
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242 | |||
243 | push ecx edx esi edi ;;; |
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244 | call SOCKET_fork |
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245 | pop edi esi edx ecx |
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246 | |||
247 | test eax, eax |
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248 | jz .drop_no_socket |
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249 | |||
250 | mov ebx, eax |
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251 | |||
252 | mov [temp_bits], TCP_BIT_DROPSOCKET |
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253 | |||
254 | push dword [edi + 4] ; Ipv4 destination addres |
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255 | pop [ebx + IP_SOCKET.LocalIP] |
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256 | |||
257 | push [edx + TCP_header.DestinationPort] |
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258 | pop [ebx + TCP_SOCKET.LocalPort] |
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259 | |||
260 | mov [ebx + TCP_SOCKET.t_state], TCPS_LISTEN |
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261 | .no_accept: |
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262 | |||
263 | |||
264 | ;------------------------------------- |
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265 | ; Reset idle timer and keepalive timer |
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266 | |||
267 | mov [ebx + TCP_SOCKET.t_idle], 0 |
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268 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_idle |
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269 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_keepalive |
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270 | |||
271 | ;-------------------- |
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272 | ; Process TCP options |
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273 | |||
274 | ;;; FIXME: for LISTEN, options should be called after we determined route, we need it for MSS |
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275 | ;;; cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN ; no options when in listen state |
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276 | ;;; jz .not_uni_xfer ; also no header prediction |
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277 | |||
278 | push ecx |
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279 | |||
280 | mov ecx, [dataoffset] |
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281 | cmp ecx, sizeof.TCP_header ; Does header contain any options? |
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282 | je .no_options |
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283 | |||
284 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Segment has options\n" |
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285 | |||
286 | add ecx, edx |
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287 | lea esi, [edx + sizeof.TCP_header] |
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288 | |||
289 | .opt_loop: |
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290 | cmp esi, ecx ; are we scanning outside of header? |
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291 | jae .no_options |
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292 | lodsb |
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293 | cmp al, TCP_OPT_EOL ; end of option list? |
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294 | je .no_options |
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295 | cmp al, TCP_OPT_NOP |
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296 | je .opt_loop |
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297 | cmp al, TCP_OPT_MAXSEG |
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298 | je .opt_maxseg |
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299 | cmp al, TCP_OPT_WINDOW |
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300 | je .opt_window |
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301 | cmp al, TCP_OPT_SACK_PERMIT |
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302 | je .opt_sack_permit |
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303 | ; cmp al, TCP_OPT_SACK |
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304 | ; je .opt_sack |
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305 | cmp al, TCP_OPT_TIMESTAMP |
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306 | je .opt_timestamp |
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307 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: unknown option:%u\n", al |
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308 | jmp .no_options ; If we reach here, some unknown options were received, skip them all! |
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309 | |||
310 | .opt_maxseg: |
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311 | lodsb |
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312 | cmp al, 4 |
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313 | jne .no_options ; error occured, ignore all options! |
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314 | |||
315 | test [edx + TCP_header.Flags], TH_SYN |
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316 | jz @f |
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317 | |||
318 | xor eax, eax |
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319 | lodsw |
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320 | rol ax, 8 |
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321 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Maxseg=%u\n", eax |
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322 | call TCP_mss |
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323 | @@: |
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324 | jmp .opt_loop |
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325 | |||
326 | |||
327 | .opt_window: |
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328 | lodsb |
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329 | cmp al, 3 |
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330 | jne .no_options |
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331 | |||
332 | test [edx + TCP_header.Flags], TH_SYN |
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333 | jz @f |
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334 | |||
335 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Got window scale option\n" |
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336 | or [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
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337 | |||
338 | lodsb |
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339 | mov [ebx + TCP_SOCKET.SND_SCALE], al |
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340 | ;;;;; TODO |
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341 | |||
342 | @@: |
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343 | jmp .opt_loop |
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344 | |||
345 | |||
346 | .opt_sack_permit: |
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347 | lodsb |
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348 | cmp al, 2 |
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349 | jne .no_options |
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350 | |||
351 | test [edx + TCP_header.Flags], TH_SYN |
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352 | jz @f |
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353 | |||
354 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Selective Acknowledgement permitted\n" |
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355 | or [ebx + TCP_SOCKET.t_flags], TF_SACK_PERMIT |
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356 | |||
357 | @@: |
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358 | jmp .opt_loop |
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359 | |||
360 | |||
361 | .opt_timestamp: |
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362 | lodsb |
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363 | cmp al, 10 ; length must be 10 |
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364 | jne .no_options |
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365 | |||
366 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Got timestamp option\n" |
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367 | |||
368 | test [edx + TCP_header.Flags], TH_SYN |
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369 | jz @f |
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370 | or [ebx + TCP_SOCKET.t_flags], TF_RCVD_TSTMP |
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371 | @@: |
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372 | |||
373 | lodsd |
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374 | bswap eax |
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375 | mov [ebx + TCP_SOCKET.ts_val], eax |
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376 | lodsd ; timestamp echo reply |
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377 | mov [ebx + TCP_SOCKET.ts_ecr], eax |
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378 | or [temp_bits], TCP_BIT_TIMESTAMP |
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379 | |||
380 | ; Since we have a timestamp, lets do the paws test right away! |
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381 | |||
382 | test [edx + TCP_header.Flags], TH_RST |
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383 | jnz .no_paws |
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384 | |||
385 | mov eax, [ebx + TCP_SOCKET.ts_recent] |
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386 | test eax, eax |
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387 | jz .no_paws |
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388 | cmp eax, [ebx + TCP_SOCKET.ts_val] |
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389 | jbe .no_paws |
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390 | |||
391 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: PAWS: detected an old segment\n" |
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392 | |||
393 | mov eax, [timestamp] |
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394 | sub eax, [ebx + TCP_SOCKET.ts_recent_age] |
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395 | |||
396 | pop ecx |
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397 | cmp eax, TCP_PAWS_IDLE |
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398 | jle .drop_after_ack ; TODO: update stats |
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399 | push ecx |
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400 | |||
401 | mov [ebx + TCP_SOCKET.ts_recent], 0 ; timestamp was invalid, fix it. |
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402 | .no_paws: |
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403 | jmp .opt_loop |
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404 | |||
405 | .no_options: |
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406 | |||
407 | pop ecx |
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408 | |||
409 | ;----------------------------------------------------------------------- |
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410 | ; Time to do some header prediction (Original Principle by Van Jacobson) |
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411 | |||
412 | ; There are two common cases for an uni-directional data transfer. |
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413 | ; |
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414 | ; General rule: the packets has no control flags, is in-sequence, |
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415 | ; window width didnt change and we're not retransmitting. |
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416 | ; |
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417 | ; Second rules: |
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418 | ; - If the length is 0 and the ACK moved forward, we're the sender side of the transfer. |
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419 | ; In this case we'll free the ACK'ed data and notify higher levels that we have free space in buffer |
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420 | ; |
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421 | ; - If the length is not 0 and the ACK didn't move, we're the receiver side of the transfer. |
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422 | ; If the packets are in order (data queue is empty), add the data to the socket buffer and request a delayed ACK |
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423 | |||
424 | cmp [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
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425 | jnz .not_uni_xfer |
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426 | |||
427 | test [edx + TCP_header.Flags], TH_SYN + TH_FIN + TH_RST + TH_URG |
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428 | jnz .not_uni_xfer |
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429 | |||
430 | test [edx + TCP_header.Flags], TH_ACK |
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431 | jz .not_uni_xfer |
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432 | |||
433 | mov eax, [edx + TCP_header.SequenceNumber] |
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434 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
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435 | jne .not_uni_xfer |
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436 | |||
437 | mov eax, dword [edx + TCP_header.Window] |
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438 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
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439 | jne .not_uni_xfer |
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440 | |||
441 | mov eax, [ebx + TCP_SOCKET.SND_NXT] |
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442 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
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443 | jne .not_uni_xfer |
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444 | |||
445 | ;--------------------------------------- |
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446 | ; check if we are sender in the uni-xfer |
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447 | |||
448 | ; If the following 4 conditions are all true, this segment is a pure ACK. |
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449 | ; |
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450 | ; - The segment contains no data. |
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451 | test ecx, ecx |
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452 | jnz .not_sender |
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453 | |||
454 | ; - The congestion window is greater than or equal to the current send window. |
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455 | ; This test is true only if the window is fully open, that is, the connection is not in the middle of slow start or congestion avoidance. |
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456 | mov eax, [ebx + TCP_SOCKET.SND_CWND] |
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457 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
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458 | jb .not_uni_xfer |
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459 | |||
460 | ; - The acknowledgment field in the segment is less than or equal to the maximum sequence number sent. |
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461 | mov eax, [edx + TCP_header.AckNumber] |
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462 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
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463 | ja .not_uni_xfer |
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464 | |||
465 | ; - The acknowledgment field in the segment is greater than the largest unacknowledged sequence number. |
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466 | sub eax, [ebx + TCP_SOCKET.SND_UNA] |
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467 | jbe .not_uni_xfer |
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468 | |||
469 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Header prediction: we are sender\n" |
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470 | |||
471 | ;--------------------------------- |
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472 | ; Packet is a pure ACK, process it |
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473 | |||
474 | ; Delete acknowledged bytes from send buffer |
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475 | pusha |
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476 | mov ecx, eax |
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477 | lea eax, [ebx + STREAM_SOCKET.snd] |
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478 | call SOCKET_ring_free |
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479 | popa |
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480 | |||
481 | ; Update RTT estimators |
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482 | |||
483 | test [temp_bits], TCP_BIT_TIMESTAMP |
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484 | jz .no_timestamp_rtt |
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485 | mov eax, [timestamp] |
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486 | sub eax, [ebx + TCP_SOCKET.ts_ecr] |
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487 | inc eax |
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488 | call TCP_xmit_timer |
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489 | jmp .rtt_done |
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490 | |||
491 | .no_timestamp_rtt: |
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492 | cmp [ebx + TCP_SOCKET.t_rtt], 0 |
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493 | je .rtt_done |
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494 | mov eax, [edx + TCP_header.AckNumber] |
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495 | cmp eax, [ebx + TCP_SOCKET.t_rtseq] |
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496 | jbe .rtt_done |
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497 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
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498 | call TCP_xmit_timer |
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499 | |||
500 | .rtt_done: |
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501 | |||
502 | ; update window pointers |
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503 | mov eax, [edx + TCP_header.AckNumber] |
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504 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
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505 | |||
506 | ; Stop retransmit timer |
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507 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission |
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508 | |||
509 | ; Unlock the socket |
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510 | pusha |
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511 | lea ecx, [ebx + SOCKET.mutex] |
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512 | call mutex_unlock |
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513 | popa |
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514 | |||
515 | ; Awaken waiting processes |
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516 | mov eax, ebx |
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517 | call SOCKET_notify |
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518 | |||
519 | ; Generate more output |
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520 | call TCP_output |
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521 | |||
522 | jmp .drop_no_socket |
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523 | |||
524 | ;------------------------------------------------- |
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525 | ; maybe we are the receiver in the uni-xfer then.. |
||
526 | |||
527 | .not_sender: |
||
528 | ; - The amount of data in the segment is greater than 0 (data count is in ecx) |
||
529 | |||
530 | ; - The acknowledgment field equals the largest unacknowledged sequence number. This means no data is acknowledged by this segment. |
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531 | mov eax, [edx + TCP_header.AckNumber] |
||
532 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
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533 | jne .not_uni_xfer |
||
534 | |||
535 | ; - The reassembly list of out-of-order segments for the connection is empty (seg_next equals tp). |
||
536 | |||
537 | ;;; TODO |
||
538 | |||
539 | ; jnz .not_uni_xfer |
||
540 | |||
541 | ; Complete processing of received data |
||
542 | |||
543 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Header prediction: we are receiving %u bytes\n", ecx |
||
544 | |||
545 | mov esi, [dataoffset] |
||
546 | add esi, edx |
||
547 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
548 | call SOCKET_ring_write ; Add the data to the socket buffer |
||
549 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
||
550 | |||
551 | mov eax, ebx |
||
552 | call SOCKET_notify |
||
553 | |||
554 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK ; Set delayed ack flag |
||
555 | |||
556 | jmp .drop |
||
557 | |||
558 | ;-------------------------------------------------- |
||
559 | ; Header prediction failed, do it the slow way |
||
560 | |||
561 | .not_uni_xfer: |
||
562 | |||
563 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Header prediction failed\n" |
||
564 | |||
565 | ; Calculate receive window size |
||
566 | push edx |
||
567 | mov eax, SOCKET_MAXDATA |
||
568 | sub eax, [ebx + STREAM_SOCKET.rcv.size] |
||
569 | DEBUGF DEBUG_NETWORK_VERBOSE, "Space in receive buffer=%d\n", eax |
||
570 | mov edx, [ebx + TCP_SOCKET.RCV_ADV] |
||
571 | sub edx, [ebx + TCP_SOCKET.RCV_NXT] |
||
572 | DEBUGF DEBUG_NETWORK_VERBOSE, "Current advertised window=%d\n", edx |
||
573 | cmp eax, edx |
||
574 | jg @f |
||
575 | mov eax, edx |
||
576 | @@: |
||
577 | DEBUGF DEBUG_NETWORK_VERBOSE, "Receive window size=%d\n", eax |
||
578 | mov [ebx + TCP_SOCKET.RCV_WND], eax |
||
579 | pop edx |
||
580 | |||
581 | ; If we are in listen or syn_sent state, go to that specific code right away |
||
582 | |||
583 | cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN |
||
584 | je .LISTEN |
||
585 | |||
586 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_SENT |
||
587 | je .SYN_SENT |
||
588 | |||
589 | ;---------------------------- |
||
590 | ; trim any data not in window |
||
591 | |||
592 | ; 1. Check for duplicate data at beginning of segment |
||
593 | |||
594 | ; Calculate number of bytes we need to drop |
||
595 | mov eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
596 | sub eax, [edx + TCP_header.SequenceNumber] |
||
597 | jle .no_duplicate |
||
598 | |||
599 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: %u bytes duplicate data!\n", eax |
||
600 | |||
601 | test [edx + TCP_header.Flags], TH_SYN |
||
602 | jz .no_dup_syn |
||
603 | |||
604 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: got duplicate syn\n" |
||
605 | |||
606 | and [edx + TCP_header.Flags], not (TH_SYN) |
||
607 | inc [edx + TCP_header.SequenceNumber] |
||
608 | |||
609 | cmp [edx + TCP_header.UrgentPointer], 1 |
||
610 | jbe @f |
||
611 | dec [edx + TCP_header.UrgentPointer] |
||
612 | jmp .dup_syn |
||
613 | @@: |
||
614 | and [edx + TCP_header.Flags], not (TH_URG) |
||
615 | .dup_syn: |
||
616 | dec eax |
||
617 | .no_dup_syn: |
||
618 | |||
619 | ; 2. Check for entire duplicate segment |
||
620 | cmp eax, ecx ; eax holds number of bytes to drop, ecx is data size |
||
621 | jb .duplicate |
||
622 | jnz @f |
||
623 | test [edx + TCP_header.Flags], TH_FIN |
||
624 | jnz .duplicate |
||
625 | @@: |
||
626 | |||
627 | ; Any valid FIN must be to the left of the window. |
||
628 | ; At this point the FIN must be out of sequence or a duplicate, drop it |
||
629 | and [edx + TCP_header.Flags], not TH_FIN |
||
630 | |||
631 | ; send an ACK and resynchronize and drop any data. |
||
632 | ; But keep on processing for RST or ACK |
||
633 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
634 | mov eax, ecx |
||
635 | |||
636 | ;;; TODO: update stats |
||
637 | |||
638 | ;----------------------------------------------- |
||
639 | ; Remove duplicate data and update urgent offset |
||
640 | |||
641 | .duplicate: |
||
642 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: trimming duplicate data\n" |
||
643 | |||
644 | ; Trim data from left side of window |
||
645 | add [dataoffset], eax |
||
646 | add [edx + TCP_header.SequenceNumber], eax |
||
647 | sub ecx, eax |
||
648 | |||
649 | sub [edx + TCP_header.UrgentPointer], ax |
||
650 | jg @f |
||
651 | and [edx + TCP_header.Flags], not (TH_URG) |
||
652 | mov [edx + TCP_header.UrgentPointer], 0 |
||
653 | @@: |
||
654 | |||
655 | ;-------------------------------------------------- |
||
656 | ; Handle data that arrives after process terminates |
||
657 | |||
658 | .no_duplicate: |
||
659 | cmp [ebx + SOCKET.PID], 0 ;;; TODO: use socket flags instead?? |
||
660 | jne .not_terminated |
||
661 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
||
662 | jbe .not_terminated |
||
663 | test ecx, ecx |
||
664 | jz .not_terminated |
||
665 | |||
666 | mov eax, ebx |
||
667 | call TCP_close |
||
668 | ;;; TODO: update stats |
||
669 | jmp .respond_seg_reset |
||
670 | |||
671 | ;---------------------------------------- |
||
672 | ; Remove data beyond right edge of window |
||
673 | |||
674 | .not_terminated: |
||
675 | mov eax, [edx + TCP_header.SequenceNumber] |
||
676 | add eax, ecx |
||
677 | sub eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
678 | sub eax, [ebx + TCP_SOCKET.RCV_WND] ; eax now holds the number of bytes to drop |
||
679 | jle .no_excess_data |
||
680 | |||
681 | DEBUGF DEBUG_NETWORK_VERBOSE, "%d bytes beyond right edge of window\n", eax |
||
682 | |||
683 | ;;; TODO: update stats |
||
684 | cmp eax, ecx |
||
685 | jl .dont_drop_all |
||
686 | ; If a new connection request is received while in TIME_WAIT, drop the old connection and start over, |
||
687 | ; if the sequence numbers are above the previous ones |
||
688 | |||
689 | test [edx + TCP_header.Flags], TH_SYN |
||
690 | jz .no_new_request |
||
691 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
692 | jne .no_new_request |
||
693 | ; mov edx, [ebx + TCP_SOCKET.RCV_NXT] |
||
694 | ; cmp edx, [edx + TCP_header.SequenceNumber] |
||
695 | ; add edx, 64000 ; TCP_ISSINCR FIXME |
||
696 | mov eax, ebx |
||
697 | call TCP_close |
||
698 | jmp .findpcb ; FIXME: skip code for unscaling window, ... |
||
699 | .no_new_request: |
||
700 | |||
701 | ; If window is closed, we can only take segments at window edge, and have to drop data and PUSH from |
||
702 | ; incoming segments. Continue processing, but remember to ACK. Otherwise drop segment and ACK |
||
703 | |||
704 | cmp [ebx + TCP_SOCKET.RCV_WND], 0 |
||
705 | jne .drop_after_ack |
||
706 | mov esi, [edx + TCP_header.SequenceNumber] |
||
707 | cmp esi, [ebx + TCP_SOCKET.RCV_NXT] |
||
708 | jne .drop_after_ack |
||
709 | |||
710 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
711 | ;;; TODO: update stats |
||
712 | .dont_drop_all: |
||
713 | ;;; TODO: update stats |
||
714 | DEBUGF DEBUG_NETWORK_VERBOSE, "Trimming %u bytes from the right of the window\n" |
||
715 | sub ecx, eax ; remove data from the right side of window (decrease data length) |
||
716 | and [edx + TCP_header.Flags], not (TH_PUSH or TH_FIN) |
||
717 | .no_excess_data: |
||
718 | |||
719 | ;----------------- |
||
720 | ; Record timestamp |
||
721 | |||
722 | ; If last ACK falls within this segments sequence numbers, record its timestamp |
||
723 | test [temp_bits], TCP_BIT_TIMESTAMP |
||
724 | jz .no_timestamp |
||
725 | mov eax, [ebx + TCP_SOCKET.last_ack_sent] |
||
726 | sub eax, [edx + TCP_header.SequenceNumber] |
||
727 | jb .no_timestamp |
||
728 | test [ebx + TCP_header.Flags], TH_SYN or TH_FIN ; syn and fin occupy one byte |
||
729 | jz @f |
||
730 | dec eax |
||
731 | @@: |
||
732 | sub eax, ecx |
||
733 | jae .no_timestamp |
||
734 | |||
735 | DEBUGF DEBUG_NETWORK_VERBOSE, "Recording timestamp\n" |
||
736 | |||
737 | mov eax, [timestamp] |
||
738 | mov [ebx + TCP_SOCKET.ts_recent_age], eax |
||
739 | mov eax, [ebx + TCP_SOCKET.ts_val] |
||
740 | mov [ebx + TCP_SOCKET.ts_recent], eax |
||
741 | .no_timestamp: |
||
742 | |||
743 | ;------------------ |
||
744 | ; Process RST flags |
||
745 | |||
746 | test [edx + TCP_header.Flags], TH_RST |
||
747 | jz .no_rst |
||
748 | |||
749 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Got an RST flag\n" |
||
750 | |||
751 | mov eax, [ebx + TCP_SOCKET.t_state] |
||
752 | shl eax, 2 |
||
753 | jmp dword [eax + .rst_sw_list] |
||
754 | |||
755 | .rst_sw_list: |
||
756 | dd .no_rst ; TCPS_CLOSED |
||
757 | dd .no_rst ; TCPS_LISTEN |
||
758 | dd .no_rst ; TCPS_SYN_SENT |
||
759 | dd .econnrefused ; TCPS_SYN_RECEIVED |
||
760 | dd .econnreset ; TCPS_ESTABLISHED |
||
761 | dd .econnreset ; TCPS_CLOSE_WAIT |
||
762 | dd .econnreset ; TCPS_FIN_WAIT_1 |
||
763 | dd .rst_close ; TCPS_CLOSING |
||
764 | dd .rst_close ; TCPS_LAST_ACK |
||
765 | dd .econnreset ; TCPS_FIN_WAIT_2 |
||
766 | dd .rst_close ; TCPS_TIMED_WAIT |
||
767 | |||
768 | .econnrefused: |
||
769 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Connection refused\n" |
||
770 | |||
771 | mov [ebx + SOCKET.errorcode], ECONNREFUSED |
||
772 | jmp .close |
||
773 | |||
774 | .econnreset: |
||
775 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Connection reset\n" |
||
776 | |||
777 | mov [ebx + SOCKET.errorcode], ECONNRESET |
||
778 | |||
779 | .close: |
||
780 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Closing connection\n" |
||
781 | |||
782 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
||
783 | ;;; TODO: update stats (tcp drops) |
||
784 | mov eax, ebx |
||
785 | call TCP_close |
||
786 | jmp .drop_no_socket |
||
787 | |||
788 | .rst_close: |
||
789 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Closing with reset\n" |
||
790 | |||
791 | mov eax, ebx |
||
792 | call TCP_close |
||
793 | jmp .drop_no_socket |
||
794 | |||
795 | .no_rst: |
||
796 | |||
797 | ;-------------------------------------- |
||
798 | ; handle SYN-full and ACK-less segments |
||
799 | |||
800 | test [edx + TCP_header.Flags], TH_SYN |
||
801 | jz .not_syn_full |
||
802 | |||
803 | mov eax, ebx |
||
804 | mov ebx, ECONNRESET |
||
805 | call TCP_drop |
||
806 | jmp .drop_with_reset |
||
807 | .not_syn_full: |
||
808 | |||
809 | ;--------------- |
||
810 | ; ACK processing |
||
811 | |||
812 | test [edx + TCP_header.Flags], TH_ACK |
||
813 | jz .drop |
||
814 | |||
815 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
||
816 | jb .ack_processed ; states: closed, listen, syn_sent |
||
817 | ja .no_syn_rcv ; established, fin_wait_1, fin_wait_2, close_wait, closing, last_ack, time_wait |
||
818 | |||
819 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: state=syn_received\n" |
||
820 | |||
821 | mov eax, [edx + TCP_header.AckNumber] |
||
822 | cmp [ebx + TCP_SOCKET.SND_UNA], eax |
||
823 | ja .drop_with_reset |
||
824 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
825 | ja .drop_with_reset |
||
826 | |||
827 | ;;; TODO: update stats |
||
828 | |||
829 | mov eax, ebx |
||
830 | call SOCKET_is_connected |
||
831 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
||
832 | |||
833 | ; Do window scaling? |
||
834 | |||
835 | test [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
||
836 | jz @f |
||
837 | test [ebx + TCP_SOCKET.t_flags], TF_REQ_SCALE |
||
838 | jz @f |
||
839 | |||
840 | push word [ebx + TCP_SOCKET.requested_s_scale] ; Set send and receive scale factors to the received values |
||
841 | pop word [ebx + TCP_SOCKET.SND_SCALE] |
||
842 | @@: |
||
843 | |||
844 | ;;; TODO: call TCP_reassemble |
||
845 | |||
846 | mov eax, [edx + TCP_header.SequenceNumber] |
||
847 | dec eax |
||
848 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
849 | |||
850 | .no_syn_rcv: |
||
851 | |||
852 | ;------------------------- |
||
853 | ; check for duplicate ACKs |
||
854 | |||
855 | mov eax, [edx + TCP_header.AckNumber] |
||
856 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
857 | ja .not_dup_ack |
||
858 | |||
859 | test ecx, ecx |
||
860 | jnz .reset_dupacks |
||
861 | |||
862 | mov eax, dword [edx + TCP_header.Window] |
||
863 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
864 | jne .reset_dupacks |
||
865 | |||
866 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Processing duplicate ACK\n" |
||
867 | |||
868 | ; If we have outstanding data, other than a window probe, this is a completely duplicate ACK |
||
869 | ; (window info didnt change) The ACK is the biggest we've seen and we've seen exactly our rexmt threshold of them, |
||
870 | ; assume a packet has been dropped and retransmit it. Kludge snd_nxt & the congestion window so we send only this one packet. |
||
871 | |||
872 | test [ebx + TCP_SOCKET.timer_flags], timer_flag_retransmission |
||
873 | jz @f |
||
874 | |||
875 | mov eax, [edx + TCP_header.AckNumber] |
||
876 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
877 | je .dup_ack |
||
878 | |||
879 | @@: |
||
880 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
||
881 | jmp .not_dup_ack |
||
882 | |||
883 | .dup_ack: |
||
884 | inc [ebx + TCP_SOCKET.t_dupacks] |
||
885 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
||
886 | jne .no_re_xmit |
||
887 | |||
888 | push [ebx + TCP_SOCKET.SND_NXT] ; >>>> |
||
889 | |||
890 | mov eax, [ebx + TCP_SOCKET.SND_WND] |
||
891 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
||
892 | jbe @f |
||
893 | mov eax, [ebx + TCP_SOCKET.SND_CWND] |
||
894 | @@: |
||
895 | shr eax, 1 |
||
896 | push edx |
||
897 | xor edx, edx |
||
898 | div [ebx + TCP_SOCKET.t_maxseg] |
||
899 | cmp eax, 2 |
||
900 | ja @f |
||
901 | xor eax, eax |
||
902 | mov al, 2 |
||
903 | @@: |
||
904 | mul [ebx + TCP_SOCKET.t_maxseg] |
||
905 | pop edx |
||
906 | mov [ebx + TCP_SOCKET.SND_SSTHRESH], eax |
||
907 | |||
908 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission ; turn off retransmission timer |
||
909 | mov [ebx + TCP_SOCKET.t_rtt], 0 |
||
910 | mov eax, [edx + TCP_header.AckNumber] |
||
911 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
912 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
913 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
914 | |||
915 | ; Unlock the socket |
||
916 | push ebx |
||
917 | lea ecx, [ebx + SOCKET.mutex] |
||
918 | call mutex_unlock |
||
919 | |||
920 | ; retransmit missing segment |
||
921 | mov eax, [esp] |
||
922 | call TCP_output |
||
923 | |||
924 | ; Lock the socket again |
||
925 | mov ecx, [esp] |
||
926 | add ecx, SOCKET.mutex |
||
927 | call mutex_lock |
||
928 | pop ebx |
||
929 | |||
930 | ; Continue processing |
||
931 | xor edx, edx |
||
932 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
933 | mul [ebx + TCP_SOCKET.t_dupacks] |
||
934 | add eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
||
935 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
936 | |||
937 | pop eax ; <<<< |
||
938 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
939 | jb @f |
||
940 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
941 | @@: |
||
942 | |||
943 | jmp .drop |
||
944 | |||
945 | |||
946 | .no_re_xmit: |
||
947 | jbe .not_dup_ack |
||
948 | |||
949 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Increasing congestion window\n" |
||
950 | |||
951 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
952 | add [ebx + TCP_SOCKET.SND_CWND], eax |
||
953 | |||
954 | ; Unlock the socket |
||
955 | push ebx |
||
956 | lea ecx, [ebx + SOCKET.mutex] |
||
957 | call mutex_unlock |
||
958 | |||
959 | ; retransmit missing segment |
||
960 | mov eax, [esp] |
||
961 | call TCP_output |
||
962 | |||
963 | ; Lock the socket again |
||
964 | mov ecx, [esp] |
||
965 | add ecx, SOCKET.mutex |
||
966 | call mutex_lock |
||
967 | pop ebx |
||
968 | |||
969 | jmp .drop |
||
970 | |||
971 | |||
972 | .not_dup_ack: |
||
973 | |||
974 | ;------------------------------------------------- |
||
975 | ; If the congestion window was inflated to account |
||
976 | ; for the other side's cached packets, retract it |
||
977 | |||
978 | mov eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
||
979 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
||
980 | ja @f |
||
981 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
||
982 | jbe @f |
||
983 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
984 | @@: |
||
985 | |||
986 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
||
987 | |||
988 | mov eax, [edx + TCP_header.AckNumber] |
||
989 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
990 | jbe @f |
||
991 | |||
992 | ;;; TODO: update stats |
||
993 | jmp .drop_after_ack |
||
994 | |||
995 | @@: |
||
996 | |||
997 | mov edi, [edx + TCP_header.AckNumber] |
||
998 | sub edi, [ebx + TCP_SOCKET.SND_UNA] ; now we got the number of acked bytes in edi |
||
999 | |||
1000 | ;;; TODO: update stats |
||
1001 | |||
1002 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: acceptable ACK for %u bytes\n", edi |
||
1003 | |||
1004 | ;------------------------------------------ |
||
1005 | ; RTT measurements and retransmission timer |
||
1006 | |||
1007 | ; If we have a timestamp, update smoothed RTT |
||
1008 | |||
1009 | test [temp_bits], TCP_BIT_TIMESTAMP |
||
1010 | jz .timestamp_not_present |
||
1011 | mov eax, [timestamp] |
||
1012 | sub eax, [ebx + TCP_SOCKET.ts_ecr] |
||
1013 | inc eax |
||
1014 | call TCP_xmit_timer |
||
1015 | jmp .rtt_done_ |
||
1016 | |||
1017 | ; If no timestamp but transmit timer is running and timed sequence number was acked, |
||
1018 | ; update smoothed RTT. Since we now have an RTT measurement, cancel the timer backoff |
||
1019 | ; (Phil Karn's retransmit algo) |
||
1020 | ; Recompute the initial retransmit timer |
||
1021 | |||
1022 | .timestamp_not_present: |
||
1023 | mov eax, [edx + TCP_header.AckNumber] |
||
1024 | cmp eax, [ebx + TCP_SOCKET.t_rtseq] |
||
1025 | jbe .rtt_done_ |
||
1026 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
||
1027 | test eax, eax |
||
1028 | jz .rtt_done_ |
||
1029 | call TCP_xmit_timer |
||
1030 | |||
1031 | .rtt_done_: |
||
1032 | |||
1033 | ; If all outstanding data is acked, stop retransmit timer and remember to restart (more output or persist) |
||
1034 | ; If there is more data to be acked, restart retransmit timer, using current (possible backed-off) value. |
||
1035 | |||
1036 | mov eax, [ebx + TCP_SOCKET.SND_MAX] |
||
1037 | cmp eax, [edx + TCP_header.AckNumber] |
||
1038 | jne .more_data |
||
1039 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission |
||
1040 | or [temp_bits], TCP_BIT_NEEDOUTPUT |
||
1041 | jmp .no_restart |
||
1042 | .more_data: |
||
1043 | test [ebx + TCP_SOCKET.timer_flags], timer_flag_persist |
||
1044 | jnz .no_restart |
||
1045 | |||
1046 | mov eax, [ebx + TCP_SOCKET.t_rxtcur] |
||
1047 | mov [ebx + TCP_SOCKET.timer_retransmission], eax |
||
1048 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_retransmission |
||
1049 | .no_restart: |
||
1050 | |||
1051 | |||
1052 | ;------------------------------------------- |
||
1053 | ; Open congestion window in response to ACKs |
||
1054 | |||
1055 | mov esi, [ebx + TCP_SOCKET.SND_CWND] |
||
1056 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
1057 | |||
1058 | cmp esi, [ebx + TCP_SOCKET.SND_SSTHRESH] |
||
1059 | jbe @f |
||
1060 | push edx |
||
1061 | push eax |
||
1062 | mul eax |
||
1063 | div esi |
||
1064 | pop edx |
||
1065 | shr edx, 3 |
||
1066 | add eax, edx |
||
1067 | pop edx |
||
1068 | @@: |
||
1069 | |||
1070 | add esi, eax |
||
1071 | |||
1072 | push ecx |
||
1073 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
||
1074 | mov eax, TCP_max_win |
||
1075 | shl eax, cl |
||
1076 | pop ecx |
||
1077 | |||
1078 | cmp esi, eax |
||
1079 | jbe @f |
||
1080 | mov esi, eax |
||
1081 | @@: |
||
1082 | mov [ebx + TCP_SOCKET.SND_CWND], esi |
||
1083 | |||
1084 | ;------------------------------------------ |
||
1085 | ; Remove acknowledged data from send buffer |
||
1086 | |||
1087 | cmp edi, [ebx + STREAM_SOCKET.snd.size] |
||
1088 | jbe .finiacked |
||
1089 | |||
1090 | push ecx edx ebx |
||
1091 | mov ecx, [ebx + STREAM_SOCKET.snd.size] |
||
1092 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1093 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
||
1094 | call SOCKET_ring_free |
||
1095 | pop ebx edx ecx |
||
1096 | |||
1097 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: our FIN is acked\n" |
||
1098 | stc |
||
1099 | |||
1100 | jmp .wakeup |
||
1101 | |||
1102 | .finiacked: |
||
1103 | |||
1104 | push ecx edx ebx |
||
1105 | mov ecx, edi |
||
1106 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1107 | call SOCKET_ring_free |
||
1108 | pop ebx |
||
1109 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
||
1110 | pop edx ecx |
||
1111 | |||
1112 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: our FIN is not acked\n" |
||
1113 | clc |
||
1114 | |||
1115 | ;---------------------------------------- |
||
1116 | ; Wake up process waiting on send buffer |
||
1117 | |||
1118 | .wakeup: |
||
1119 | |||
1120 | pushf ; Keep the flags (Carry flag) |
||
1121 | mov eax, ebx |
||
1122 | call SOCKET_notify |
||
1123 | |||
1124 | ; Update TCPS |
||
1125 | |||
1126 | mov eax, [edx + TCP_header.AckNumber] |
||
1127 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
1128 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
1129 | jb @f |
||
1130 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1131 | @@: |
||
1132 | |||
1133 | popf |
||
1134 | |||
1135 | ; General ACK handling complete |
||
1136 | ; Now do the state-specific ones |
||
1137 | ; Carry flag is set when our FIN is acked |
||
1138 | |||
1139 | mov eax, [ebx + TCP_SOCKET.t_state] |
||
1140 | jmp dword [eax*4 + .ACK_sw_list] |
||
1141 | |||
1142 | .ACK_sw_list: |
||
1143 | dd .ack_processed ; TCPS_CLOSED |
||
1144 | dd .ack_processed ; TCPS_LISTEN |
||
1145 | dd .ack_processed ; TCPS_SYN_SENT |
||
1146 | dd .ack_processed ; TCPS_SYN_RECEIVED |
||
1147 | dd .ack_processed ; TCPS_ESTABLISHED |
||
1148 | dd .ack_processed ; TCPS_CLOSE_WAIT |
||
1149 | dd .ack_fw1 ; TCPS_FIN_WAIT_1 |
||
1150 | dd .ack_c ; TCPS_CLOSING |
||
1151 | dd .ack_la ; TCPS_LAST_ACK |
||
1152 | dd .ack_processed ; TCPS_FIN_WAIT_2 |
||
1153 | dd .ack_tw ; TCPS_TIMED_WAIT |
||
1154 | |||
1155 | |||
1156 | .ack_fw1: |
||
1157 | jnc .ack_processed |
||
1158 | |||
1159 | test [ebx + SOCKET.state], SS_CANTRCVMORE |
||
1160 | jnz @f |
||
1161 | mov eax, ebx |
||
1162 | call SOCKET_is_disconnected |
||
1163 | mov [ebx + TCP_SOCKET.timer_timed_wait], TCP_time_max_idle |
||
1164 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
||
1165 | @@: |
||
1166 | mov [ebx + TCP_SOCKET.t_state], TCPS_FIN_WAIT_2 |
||
1167 | jmp .ack_processed |
||
1168 | |||
1169 | .ack_c: |
||
1170 | jnc .ack_processed |
||
1171 | |||
1172 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
1173 | mov eax, ebx |
||
1174 | call TCP_cancel_timers |
||
1175 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
1176 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
||
1177 | mov eax, ebx |
||
1178 | call SOCKET_is_disconnected |
||
1179 | jmp .ack_processed |
||
1180 | |||
1181 | .ack_la: |
||
1182 | jnc .ack_processed |
||
1183 | |||
1184 | push ebx |
||
1185 | lea ecx, [ebx + SOCKET.mutex] |
||
1186 | call mutex_unlock |
||
1187 | pop ebx |
||
1188 | |||
1189 | mov eax, ebx |
||
1190 | call TCP_close |
||
1191 | jmp .drop_no_socket |
||
1192 | |||
1193 | .ack_tw: |
||
1194 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
1195 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
||
1196 | jmp .drop_after_ack |
||
1197 | |||
1198 | .reset_dupacks: ; We got a new ACK, reset duplicate ACK counter |
||
1199 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
||
1200 | jmp .ack_processed |
||
1201 | |||
1202 | ;------- |
||
1203 | ; LISTEN |
||
1204 | |||
1205 | align 4 |
||
1206 | .LISTEN: |
||
1207 | |||
1208 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: state=listen\n" |
||
1209 | |||
1210 | test [edx + TCP_header.Flags], TH_RST |
||
1211 | jnz .drop |
||
1212 | |||
1213 | test [edx + TCP_header.Flags], TH_ACK |
||
1214 | jnz .drop_with_reset |
||
1215 | |||
1216 | test [edx + TCP_header.Flags], TH_SYN |
||
1217 | jz .drop |
||
1218 | |||
1219 | ;;; TODO: check if it's a broadcast or multicast, and drop if so |
||
1220 | |||
1221 | push dword [edi] ; Ipv4 source addres |
||
1222 | pop [ebx + IP_SOCKET.RemoteIP] |
||
1223 | |||
1224 | push [edx + TCP_header.SourcePort] |
||
1225 | pop [ebx + TCP_SOCKET.RemotePort] |
||
1226 | |||
1227 | push [edx + TCP_header.SequenceNumber] |
||
1228 | pop [ebx + TCP_SOCKET.IRS] |
||
1229 | |||
1230 | mov eax, [TCP_sequence_num] |
||
1231 | add [TCP_sequence_num], 64000 / 2 |
||
1232 | mov [ebx + TCP_SOCKET.ISS], eax |
||
1233 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1234 | |||
1235 | TCP_sendseqinit ebx |
||
1236 | TCP_rcvseqinit ebx |
||
1237 | |||
1238 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
||
1239 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1240 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval ;;;; macro |
||
1241 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_keepalive |
||
1242 | |||
1243 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1244 | call SOCKET_ring_create |
||
1245 | |||
1246 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
1247 | call SOCKET_ring_create |
||
1248 | |||
1249 | and [temp_bits], not TCP_BIT_DROPSOCKET |
||
1250 | |||
1251 | pusha |
||
1252 | mov eax, ebx |
||
1253 | call SOCKET_notify |
||
1254 | popa |
||
1255 | |||
1256 | jmp .trim_then_step6 |
||
1257 | |||
1258 | ;------------ |
||
1259 | ; Active Open |
||
1260 | |||
1261 | align 4 |
||
1262 | .SYN_SENT: |
||
1263 | |||
1264 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: state=syn_sent\n" |
||
1265 | |||
1266 | test [edx + TCP_header.Flags], TH_ACK |
||
1267 | jz @f |
||
1268 | |||
1269 | mov eax, [edx + TCP_header.AckNumber] |
||
1270 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
1271 | jbe .drop_with_reset |
||
1272 | |||
1273 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
1274 | ja .drop_with_reset |
||
1275 | @@: |
||
1276 | |||
1277 | test [edx + TCP_header.Flags], TH_RST |
||
1278 | jz @f |
||
1279 | |||
1280 | test [edx + TCP_header.Flags], TH_ACK |
||
1281 | jz .drop |
||
1282 | |||
1283 | mov eax, ebx |
||
1284 | mov ebx, ECONNREFUSED |
||
1285 | call TCP_drop |
||
1286 | |||
1287 | jmp .drop |
||
1288 | @@: |
||
1289 | |||
1290 | test [edx + TCP_header.Flags], TH_SYN |
||
1291 | jz .drop |
||
1292 | |||
1293 | ; at this point, segment seems to be valid |
||
1294 | |||
1295 | test [edx + TCP_header.Flags], TH_ACK |
||
1296 | jz .no_syn_ack |
||
1297 | |||
1298 | ; now, process received SYN in response to an active open |
||
1299 | |||
1300 | mov eax, [edx + TCP_header.AckNumber] |
||
1301 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
1302 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
1303 | jbe @f |
||
1304 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1305 | @@: |
||
1306 | |||
1307 | .no_syn_ack: |
||
1308 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission ; disable retransmission timer |
||
1309 | |||
1310 | push [edx + TCP_header.SequenceNumber] |
||
1311 | pop [ebx + TCP_SOCKET.IRS] |
||
1312 | |||
1313 | TCP_rcvseqinit ebx |
||
1314 | |||
1315 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1316 | |||
1317 | mov eax, [ebx + TCP_SOCKET.SND_UNA] |
||
1318 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
1319 | jbe .simultaneous_open |
||
1320 | |||
1321 | test [edx + TCP_header.Flags], TH_ACK |
||
1322 | jz .simultaneous_open |
||
1323 | |||
1324 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: active open\n" |
||
1325 | |||
1326 | ;;; TODO: update stats |
||
1327 | |||
1328 | ; set socket state to connected |
||
1329 | push eax |
||
1330 | mov eax, ebx |
||
1331 | call SOCKET_is_connected |
||
1332 | pop eax |
||
1333 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
||
1334 | |||
1335 | ; Do window scaling on this connection ? |
||
1336 | mov eax, [ebx + TCP_SOCKET.t_flags] |
||
1337 | and eax, TF_REQ_SCALE or TF_RCVD_SCALE |
||
1338 | cmp eax, TF_REQ_SCALE or TF_RCVD_SCALE |
||
1339 | jne .no_scaling |
||
1340 | |||
1341 | mov ax, word [ebx + TCP_SOCKET.requested_s_scale] |
||
1342 | mov word [ebx + TCP_SOCKET.SND_SCALE], ax |
||
1343 | .no_scaling: |
||
1344 | |||
1345 | ;;; TODO: reassemble packets queue |
||
1346 | |||
1347 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
||
1348 | test eax, eax |
||
1349 | je .trim_then_step6 |
||
1350 | call TCP_xmit_timer |
||
1351 | jmp .trim_then_step6 |
||
1352 | |||
1353 | .simultaneous_open: |
||
1354 | |||
1355 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: simultaneous open\n" |
||
1356 | ; We have received a syn but no ACK, so we are having a simultaneous open.. |
||
1357 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
||
1358 | |||
1359 | ;------------------------------------- |
||
1360 | ; Common processing for receipt of SYN |
||
1361 | |||
1362 | .trim_then_step6: |
||
1363 | |||
1364 | inc [edx + TCP_header.SequenceNumber] |
||
1365 | |||
1366 | ; Drop any received data that doesnt fit in the receive window. |
||
1367 | cmp ecx, [ebx + TCP_SOCKET.RCV_WND] |
||
1368 | jbe .dont_trim |
||
1369 | |||
1370 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: received data does not fit in window, trimming %u bytes\n", eax |
||
1371 | mov ecx, [ebx + TCP_SOCKET.RCV_WND] |
||
1372 | and [edx + TCP_header.Flags], not (TH_FIN) |
||
1373 | ;;; TODO: update stats |
||
1374 | |||
1375 | .dont_trim: |
||
1376 | |||
1377 | mov eax, [edx + TCP_header.SequenceNumber] |
||
1378 | mov [ebx + TCP_SOCKET.RCV_UP], eax |
||
1379 | dec eax |
||
1380 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
1381 | |||
1382 | ;------- |
||
1383 | ; step 6 |
||
1384 | |||
1385 | .ack_processed: |
||
1386 | |||
1387 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: ACK processed\n" |
||
1388 | |||
1389 | ;---------------------------------------------- |
||
1390 | ; check if we need to update window information |
||
1391 | |||
1392 | test [edx + TCP_header.Flags], TH_ACK |
||
1393 | jz .no_window_update |
||
1394 | |||
1395 | mov eax, [ebx + TCP_SOCKET.SND_WL1] |
||
1396 | cmp eax, [edx + TCP_header.SequenceNumber] |
||
1397 | jb .update_window |
||
1398 | ja @f |
||
1399 | |||
1400 | mov eax, [ebx + TCP_SOCKET.SND_WL2] |
||
1401 | cmp eax, [edx + TCP_header.AckNumber] |
||
1402 | jb .update_window |
||
1403 | ja .no_window_update |
||
1404 | @@: |
||
1405 | |||
1406 | mov eax, dword [edx + TCP_header.Window] |
||
1407 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
1408 | jbe .no_window_update |
||
1409 | |||
1410 | .update_window: |
||
1411 | |||
1412 | ;;; TODO: update stats (Keep track of pure window updates) |
||
1413 | |||
1414 | mov eax, dword [edx + TCP_header.Window] |
||
1415 | cmp eax, [ebx + TCP_SOCKET.max_sndwnd] |
||
1416 | jbe @f |
||
1417 | mov [ebx + TCP_SOCKET.max_sndwnd], eax |
||
1418 | @@: |
||
1419 | mov [ebx + TCP_SOCKET.SND_WND], eax |
||
1420 | |||
1421 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Updating window to %u\n", eax |
||
1422 | |||
1423 | push [edx + TCP_header.SequenceNumber] |
||
1424 | pop [ebx + TCP_SOCKET.SND_WL1] |
||
1425 | |||
1426 | push [edx + TCP_header.AckNumber] |
||
1427 | pop [ebx + TCP_SOCKET.SND_WL2] |
||
1428 | |||
1429 | or [temp_bits], TCP_BIT_NEEDOUTPUT |
||
1430 | |||
1431 | .no_window_update: |
||
1432 | |||
1433 | ;----------------- |
||
1434 | ; process URG flag |
||
1435 | |||
1436 | test [edx + TCP_header.Flags], TH_URG |
||
1437 | jz .not_urgent |
||
1438 | |||
1439 | cmp [edx + TCP_header.UrgentPointer], 0 |
||
1440 | jz .not_urgent |
||
1441 | |||
1442 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
1443 | je .not_urgent |
||
1444 | |||
1445 | ; Ignore bogus urgent offsets |
||
1446 | |||
1447 | movzx eax, [edx + TCP_header.UrgentPointer] |
||
1448 | add eax, [ebx + STREAM_SOCKET.rcv.size] |
||
1449 | cmp eax, SOCKET_MAXDATA |
||
1450 | jbe .not_urgent |
||
1451 | |||
1452 | mov [edx + TCP_header.UrgentPointer], 0 |
||
1453 | and [edx + TCP_header.Flags], not (TH_URG) |
||
1454 | jmp .do_data |
||
1455 | |||
1456 | .not_urgent: |
||
1457 | |||
1458 | ; processing of received urgent pointer |
||
1459 | |||
1460 | ;;; TODO (1051-1093) |
||
1461 | |||
1462 | |||
1463 | ;--------------------------------------- |
||
1464 | ; process the data in the segment (1094) |
||
1465 | |||
1466 | .do_data: |
||
1467 | |||
1468 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
1469 | jae .final_processing |
||
1470 | |||
1471 | test [edx + TCP_header.Flags], TH_FIN |
||
1472 | jnz @f |
||
1473 | |||
1474 | test ecx, ecx |
||
1475 | jz .final_processing |
||
1476 | @@: |
||
1477 | |||
1478 | ; The segment is in order? |
||
1479 | mov eax, [edx + TCP_header.SequenceNumber] |
||
1480 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
1481 | jne .out_of_order |
||
1482 | |||
1483 | ; The reassembly queue is empty? |
||
1484 | cmp [ebx + TCP_SOCKET.seg_next], 0 |
||
1485 | jne .out_of_order |
||
1486 | |||
1487 | ; The connection is established? |
||
1488 | cmp [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
||
1489 | jne .out_of_order |
||
1490 | |||
1491 | ; Ok, lets do this.. Set delayed ACK flag and copy data into socket buffer |
||
1492 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK |
||
1493 | |||
1494 | pusha |
||
1495 | mov esi, [dataoffset] |
||
1496 | add esi, edx |
||
1497 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
1498 | call SOCKET_ring_write ; Add the data to the socket buffer |
||
1499 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
||
1500 | popa |
||
1501 | |||
1502 | ; Wake up the sleeping process |
||
1503 | mov eax, ebx |
||
1504 | call SOCKET_notify |
||
1505 | |||
1506 | jmp .data_done |
||
1507 | |||
1508 | .out_of_order: |
||
1509 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP data is out of order!\nSequencenumber is %u, we expected %u.\n", \ |
||
1510 | [edx + TCP_header.SequenceNumber], [ebx + TCP_SOCKET.RCV_NXT] |
||
1511 | |||
1512 | ; Uh-oh, some data is out of order, lets call TCP reassemble for help |
||
1513 | |||
1514 | call TCP_reassemble |
||
1515 | |||
1516 | ; Generate ACK immediately, to let the other end know that a segment was received out of order, |
||
1517 | ; and to tell it what sequence number is expected. This aids the fast-retransmit algorithm. |
||
1518 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1519 | .data_done: |
||
1520 | |||
1521 | ;--------------- |
||
1522 | ; FIN processing |
||
1523 | |||
1524 | test [edx + TCP_header.Flags], TH_FIN |
||
1525 | jz .final_processing |
||
1526 | |||
1527 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Processing FIN\n" |
||
1528 | |||
1529 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
1530 | jae .not_first_fin |
||
1531 | |||
1532 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: First FIN for this connection\n" |
||
1533 | |||
1534 | mov eax, ebx |
||
1535 | call SOCKET_cant_recv_more |
||
1536 | |||
1537 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1538 | inc [ebx + TCP_SOCKET.RCV_NXT] |
||
1539 | |||
1540 | .not_first_fin: |
||
1541 | mov eax, [ebx + TCP_SOCKET.t_state] |
||
1542 | shl eax, 2 |
||
1543 | jmp dword [eax + .FIN_sw_list] |
||
1544 | |||
1545 | .FIN_sw_list: |
||
1546 | dd .final_processing ; TCPS_CLOSED |
||
1547 | dd .final_processing ; TCPS_LISTEN |
||
1548 | dd .final_processing ; TCPS_SYN_SENT |
||
1549 | dd .fin_syn_est ; TCPS_SYN_RECEIVED |
||
1550 | dd .fin_syn_est ; TCPS_ESTABLISHED |
||
1551 | dd .final_processing ; TCPS_CLOSE_WAIT |
||
1552 | dd .fin_wait1 ; TCPS_FIN_WAIT_1 |
||
1553 | dd .final_processing ; TCPS_CLOSING |
||
1554 | dd .final_processing ; TCPS_LAST_ACK |
||
1555 | dd .fin_wait2 ; TCPS_FIN_WAIT_2 |
||
1556 | dd .fin_timed ; TCPS_TIMED_WAIT |
||
1557 | |||
1558 | .fin_syn_est: |
||
1559 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
||
1560 | jmp .final_processing |
||
1561 | |||
1562 | .fin_wait1: |
||
1563 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSING |
||
1564 | jmp .final_processing |
||
1565 | |||
1566 | .fin_wait2: |
||
1567 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
1568 | mov eax, ebx |
||
1569 | call TCP_cancel_timers |
||
1570 | call SOCKET_is_disconnected |
||
1571 | |||
1572 | .fin_timed: |
||
1573 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
1574 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
||
1575 | |||
1576 | ;----------------- |
||
1577 | ; Final processing |
||
1578 | |||
1579 | .final_processing: |
||
1580 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Final processing\n" |
||
1581 | |||
1582 | push ebx |
||
1583 | lea ecx, [ebx + SOCKET.mutex] |
||
1584 | call mutex_unlock |
||
1585 | pop eax |
||
1586 | |||
1587 | test [temp_bits], TCP_BIT_NEEDOUTPUT |
||
1588 | jnz .need_output |
||
1589 | |||
1590 | test [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1591 | jz .dumpit |
||
1592 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: ACK now!\n" |
||
1593 | |||
1594 | .need_output: |
||
1595 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: need output\n" |
||
1596 | call TCP_output |
||
1597 | |||
1598 | .dumpit: |
||
1599 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: dumping\n" |
||
1600 | |||
1601 | call NET_packet_free |
||
1602 | jmp .loop |
||
1603 | |||
1604 | |||
1605 | ;----------------- |
||
1606 | ; Drop the segment |
||
1607 | |||
1608 | |||
1609 | .drop_after_ack: |
||
1610 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Drop after ACK\n" |
||
1611 | |||
1612 | push edx ebx |
||
1613 | lea ecx, [ebx + SOCKET.mutex] |
||
1614 | call mutex_unlock |
||
1615 | pop eax edx |
||
1616 | |||
1617 | test [edx + TCP_header.Flags], TH_RST |
||
1618 | jnz .dumpit |
||
1619 | |||
1620 | or [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1621 | jmp .need_output |
||
1622 | |||
1623 | .drop_with_reset: |
||
1624 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Drop with reset\n" |
||
1625 | |||
1626 | push ebx edx |
||
1627 | lea ecx, [ebx + SOCKET.mutex] |
||
1628 | call mutex_unlock |
||
1629 | pop edx ebx |
||
1630 | |||
1631 | test [edx + TCP_header.Flags], TH_RST |
||
1632 | jnz .dumpit |
||
1633 | |||
1634 | ;;; if its a multicast/broadcast, also drop |
||
1635 | |||
1636 | test [edx + TCP_header.Flags], TH_ACK |
||
1637 | jnz .respond_ack |
||
1638 | |||
1639 | test [edx + TCP_header.Flags], TH_SYN |
||
1640 | jnz .respond_syn |
||
1641 | jmp .dumpit |
||
1642 | |||
1643 | ;--------- |
||
1644 | ; Respond |
||
1645 | |||
1646 | .respond_ack: |
||
1647 | push ebx |
||
1648 | mov cl, TH_RST |
||
1649 | call TCP_respond |
||
1650 | pop ebx |
||
1651 | jmp .destroy_new_socket |
||
1652 | |||
1653 | .respond_syn: |
||
1654 | push ebx |
||
1655 | mov cl, TH_RST + TH_ACK |
||
1656 | call TCP_respond |
||
1657 | pop ebx |
||
1658 | jmp .destroy_new_socket |
||
1659 | |||
1660 | .no_socket: |
||
1661 | |||
1662 | pusha |
||
1663 | mov ecx, socket_mutex |
||
1664 | call mutex_unlock |
||
1665 | popa |
||
1666 | |||
1667 | .respond_seg_reset: |
||
1668 | test [edx + TCP_header.Flags], TH_RST |
||
1669 | jnz .drop_no_socket |
||
1670 | |||
1671 | ;;; TODO: if its a multicast/broadcast, also drop |
||
1672 | |||
1673 | test [edx + TCP_header.Flags], TH_ACK |
||
1674 | jnz .respond_seg_ack |
||
1675 | |||
1676 | test [edx + TCP_header.Flags], TH_SYN |
||
1677 | jnz .respond_seg_syn |
||
1678 | |||
1679 | jmp .drop_no_socket |
||
1680 | |||
1681 | .respond_seg_ack: |
||
1682 | mov cl, TH_RST |
||
1683 | call TCP_respond_segment |
||
1684 | jmp .drop_no_socket |
||
1685 | |||
1686 | .respond_seg_syn: |
||
1687 | mov cl, TH_RST + TH_ACK |
||
1688 | call TCP_respond_segment |
||
1689 | jmp .drop_no_socket |
||
1690 | |||
1691 | ;----- |
||
1692 | ; Drop |
||
1693 | |||
1694 | .drop: |
||
1695 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Dropping segment\n" |
||
1696 | |||
1697 | pusha |
||
1698 | lea ecx, [ebx + SOCKET.mutex] |
||
1699 | call mutex_unlock |
||
1700 | popa |
||
1701 | |||
1702 | .destroy_new_socket: |
||
1703 | test [temp_bits], TCP_BIT_DROPSOCKET |
||
1704 | jz .drop_no_socket |
||
1705 | |||
1706 | mov eax, ebx |
||
1707 | call SOCKET_free |
||
1708 | |||
1709 | .drop_no_socket: |
||
1710 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Drop (no socket)\n" |
||
1711 | |||
1712 | call NET_packet_free |
||
1713 | jmp .loop |
||
1714 | |||
1715 | endp |