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3545 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; Copyright (C) KolibriOS team 2004-2013. All rights reserved. ;; |
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4 | ;; Distributed under terms of the GNU General Public License ;; |
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5 | ;; ;; |
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6 | ;; Part of the TCP/IP network stack for KolibriOS ;; |
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7 | ;; ;; |
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8 | ;; Written by hidnplayr@kolibrios.org ;; |
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9 | ;; ;; |
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10 | ;; Based on the code of 4.4BSD ;; |
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11 | ;; ;; |
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12 | ;; GNU GENERAL PUBLIC LICENSE ;; |
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13 | ;; Version 2, June 1991 ;; |
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14 | ;; ;; |
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15 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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16 | |||
17 | $Revision: 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 | pushf |
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47 | cli |
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48 | add_to_queue TCP_queue, TCP_QUEUE_SIZE, sizeof.TCP_queue_entry, .fail |
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49 | popf |
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50 | |||
51 | add esp, sizeof.TCP_queue_entry |
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52 | |||
3644 | hidnplayr | 53 | call NET_ptr_to_num4 |
54 | inc [TCP_segments_rx + edi] |
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55 | |||
3545 | hidnplayr | 56 | xor edx, edx |
57 | mov eax, [TCP_input_event] |
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58 | mov ebx, [eax + EVENT.id] |
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59 | xor esi, esi |
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60 | call raise_event |
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61 | |||
62 | ret |
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63 | |||
64 | .fail: |
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65 | popf |
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3556 | hidnplayr | 66 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP incoming queue is full, discarding packet!\n" |
3545 | hidnplayr | 67 | |
3644 | hidnplayr | 68 | call NET_ptr_to_num4 |
69 | inc [TCP_segments_missed + edi] |
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3545 | hidnplayr | 70 | |
71 | add esp, sizeof.TCP_queue_entry - 8 |
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3861 | hidnplayr | 72 | call NET_packet_free |
3545 | hidnplayr | 73 | add esp, 4 |
74 | |||
75 | ret |
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76 | |||
77 | |||
78 | |||
79 | |||
80 | align 4 |
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4339 | hidnplayr | 81 | proc TCP_process_input |
3545 | hidnplayr | 82 | |
4339 | hidnplayr | 83 | locals |
84 | dataoffset dd ? |
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4344 | hidnplayr | 85 | timestamp dd ? |
4339 | hidnplayr | 86 | endl |
87 | |||
3545 | hidnplayr | 88 | xor esi, esi |
89 | mov ecx, MANUAL_DESTROY |
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90 | call create_event |
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91 | mov [TCP_input_event], eax |
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92 | |||
93 | .wait: |
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94 | mov eax, [TCP_input_event] |
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95 | mov ebx, [eax + EVENT.id] |
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96 | call wait_event |
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97 | |||
98 | .loop: |
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99 | get_from_queue TCP_queue, TCP_QUEUE_SIZE, sizeof.TCP_queue_entry, .wait |
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100 | |||
101 | push [esi + TCP_queue_entry.timestamp] |
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4344 | hidnplayr | 102 | pop [timestamp] |
3545 | hidnplayr | 103 | push [esi + TCP_queue_entry.buffer_ptr] |
104 | |||
105 | mov ebx, [esi + TCP_queue_entry.device_ptr] |
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106 | mov ecx, [esi + TCP_queue_entry.segment_size] |
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107 | mov edi, [esi + TCP_queue_entry.ip_ptr] ; ptr to ipv4 source address, followed by ipv4 destination address |
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108 | mov esi, [esi + TCP_queue_entry.segment_ptr] ; change esi last |
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109 | |||
3556 | hidnplayr | 110 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: size=%u time=%d\n", ecx, [timer_ticks] |
3545 | hidnplayr | 111 | |
112 | mov edx, esi |
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113 | |||
114 | cmp ebx, LOOPBACK_DEVICE |
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115 | je .checksum_ok |
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116 | |||
117 | ; re-calculate the checksum (if not already done by hw) |
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118 | ; test [ebx + NET_DEVICE.hwacc], HWACC_TCP_IPv4_IN |
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119 | ; jnz .checksum_ok |
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120 | |||
121 | push ecx esi |
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122 | pushw [esi + TCP_header.Checksum] |
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123 | mov [esi + TCP_header.Checksum], 0 |
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124 | TCP_checksum (edi), (edi+4) |
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125 | pop cx ; previous checksum |
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126 | cmp cx, dx |
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127 | pop edx ecx |
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128 | jne .drop_no_socket |
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129 | .checksum_ok: |
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130 | |||
131 | ; Verify the data offset |
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4339 | hidnplayr | 132 | movzx eax, [edx + TCP_header.DataOffset] |
133 | and al, 0xf0 ; Calculate TCP segment header size (throwing away unused reserved bits in TCP header) |
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134 | shr al, 2 |
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135 | cmp al, sizeof.TCP_header ; Now see if it's at least the size of a standard TCP header |
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136 | jb .drop_no_socket ; If not, drop the packet |
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137 | mov [dataoffset], eax |
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3545 | hidnplayr | 138 | |
139 | sub ecx, eax ; substract TCP header size from total segment size |
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140 | jb .drop_no_socket ; If total segment size is less then the advertised header size, drop packet |
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3556 | hidnplayr | 141 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: %u bytes of data\n", ecx |
3545 | hidnplayr | 142 | |
143 | ;------------------------------------------- |
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144 | ; Convert Big-endian values to little endian |
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145 | |||
146 | ntohd [edx + TCP_header.SequenceNumber] |
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147 | ntohd [edx + TCP_header.AckNumber] |
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148 | |||
149 | ntohw [edx + TCP_header.Window] |
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150 | ntohw [edx + TCP_header.UrgentPointer] |
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151 | |||
152 | ;------------------------ |
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153 | ; Find the socket pointer |
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154 | |||
155 | ; IP Packet TCP Destination Port = local Port |
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156 | ; (IP Packet SenderAddress = Remote IP) OR (Remote IP = 0) |
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157 | ; (IP Packet TCP Source Port = remote Port) OR (remote Port = 0) |
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158 | |||
159 | .findpcb: |
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3647 | hidnplayr | 160 | pusha |
161 | mov ecx, socket_mutex |
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162 | call mutex_lock |
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163 | popa |
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164 | |||
3545 | hidnplayr | 165 | mov ebx, net_sockets |
166 | mov si, [edx + TCP_header.DestinationPort] |
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167 | |||
168 | .socket_loop: |
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169 | mov ebx, [ebx + SOCKET.NextPtr] |
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170 | or ebx, ebx |
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3647 | hidnplayr | 171 | jz .no_socket ;respond_seg_reset |
3545 | hidnplayr | 172 | |
173 | cmp [ebx + SOCKET.Domain], AF_INET4 |
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174 | jne .socket_loop |
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175 | |||
176 | cmp [ebx + SOCKET.Protocol], IP_PROTO_TCP |
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177 | jne .socket_loop |
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178 | |||
179 | cmp [ebx + TCP_SOCKET.LocalPort], si |
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180 | jne .socket_loop |
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181 | |||
182 | mov eax, [ebx + IP_SOCKET.RemoteIP] |
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183 | cmp eax, [edi] ; Ipv4 source address |
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184 | je @f |
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185 | test eax, eax |
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186 | jnz .socket_loop |
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187 | @@: |
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188 | |||
189 | mov ax, [ebx + TCP_SOCKET.RemotePort] |
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190 | cmp [edx + TCP_header.SourcePort], ax |
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191 | je .found_socket |
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192 | test ax, ax |
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193 | jnz .socket_loop |
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194 | .found_socket: ; ebx now contains the socketpointer |
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3647 | hidnplayr | 195 | pusha |
196 | mov ecx, socket_mutex |
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197 | call mutex_unlock |
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198 | popa |
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199 | |||
3556 | hidnplayr | 200 | 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 |
3545 | hidnplayr | 201 | |
202 | ;---------------------------- |
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203 | ; Check if socket isnt closed |
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204 | |||
205 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
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206 | je .drop_no_socket |
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207 | |||
208 | ;---------------- |
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209 | ; Lock the socket |
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210 | |||
211 | pusha |
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212 | lea ecx, [ebx + SOCKET.mutex] |
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213 | call mutex_lock |
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214 | popa |
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215 | |||
3556 | hidnplayr | 216 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: socket locked\n" |
3545 | hidnplayr | 217 | |
218 | ;--------------------------- |
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219 | ; disable all temporary bits |
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220 | |||
221 | mov [ebx + TCP_SOCKET.temp_bits], 0 |
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222 | |||
223 | ;--------------------------------------- |
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224 | ; unscale the window into a 32 bit value |
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225 | |||
226 | movzx eax, [edx + TCP_header.Window] |
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227 | push ecx |
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228 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
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229 | shl eax, cl |
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230 | mov dword [edx + TCP_header.Window], eax ; word after window is checksum, we dont need checksum anymore |
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231 | pop ecx |
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232 | |||
233 | ;--------------------------------------- |
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234 | ; Are we accepting incoming connections? |
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235 | |||
236 | test [ebx + SOCKET.options], SO_ACCEPTCON |
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237 | jz .no_accept |
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238 | |||
3556 | hidnplayr | 239 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Accepting new connection\n" |
3545 | hidnplayr | 240 | |
241 | pusha |
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242 | lea ecx, [ebx + SOCKET.mutex] |
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243 | call mutex_unlock |
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244 | popa |
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245 | |||
246 | push ecx edx esi edi ;;; |
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247 | call SOCKET_fork |
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248 | pop edi esi edx ecx |
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249 | |||
250 | test eax, eax |
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251 | jz .drop_no_socket |
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252 | |||
253 | mov ebx, eax |
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254 | |||
255 | mov [ebx + TCP_SOCKET.temp_bits], TCP_BIT_DROPSOCKET ;;; FIXME: should we take over bits from previous socket? |
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256 | |||
257 | push dword [edi + 4] ; Ipv4 destination addres |
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258 | pop [ebx + IP_SOCKET.LocalIP] |
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259 | |||
260 | push [edx + TCP_header.DestinationPort] |
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261 | pop [ebx + TCP_SOCKET.LocalPort] |
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262 | |||
263 | mov [ebx + TCP_SOCKET.t_state], TCPS_LISTEN |
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264 | .no_accept: |
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265 | |||
266 | |||
267 | ;------------------------------------- |
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268 | ; Reset idle timer and keepalive timer |
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269 | |||
270 | mov [ebx + TCP_SOCKET.t_idle], 0 |
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271 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_idle |
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3600 | hidnplayr | 272 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_keepalive |
3545 | hidnplayr | 273 | |
274 | ;-------------------- |
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275 | ; Process TCP options |
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276 | |||
4339 | hidnplayr | 277 | ;;; FIXME: for LISTEN, options should be called after we determined route, we need it for MSS |
278 | ;;; cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN ; no options when in listen state |
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279 | ;;; jz .not_uni_xfer ; also no header prediction |
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280 | |||
3545 | hidnplayr | 281 | push ecx |
282 | |||
4339 | hidnplayr | 283 | mov ecx, [dataoffset] |
3545 | hidnplayr | 284 | cmp ecx, sizeof.TCP_header ; Does header contain any options? |
285 | je .no_options |
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286 | |||
3556 | hidnplayr | 287 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Segment has options\n" |
3545 | hidnplayr | 288 | |
289 | add ecx, edx |
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290 | lea esi, [edx + sizeof.TCP_header] |
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291 | |||
292 | .opt_loop: |
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293 | cmp esi, ecx ; are we scanning outside of header? |
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294 | jae .no_options |
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295 | lodsb |
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296 | cmp al, TCP_OPT_EOL ; end of option list? |
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297 | je .no_options |
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298 | cmp al, TCP_OPT_NOP |
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299 | je .opt_loop |
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300 | cmp al, TCP_OPT_MAXSEG |
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301 | je .opt_maxseg |
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302 | cmp al, TCP_OPT_WINDOW |
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303 | je .opt_window |
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304 | cmp al, TCP_OPT_SACK_PERMIT |
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305 | je .opt_sack_permit |
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306 | ; cmp al, TCP_OPT_SACK |
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307 | ; je .opt_sack |
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308 | cmp al, TCP_OPT_TIMESTAMP |
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309 | je .opt_timestamp |
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3556 | hidnplayr | 310 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: unknown option:%u\n", al |
3545 | hidnplayr | 311 | jmp .no_options ; If we reach here, some unknown options were received, skip them all! |
312 | |||
313 | .opt_maxseg: |
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314 | lodsb |
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315 | cmp al, 4 |
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316 | jne .no_options ; error occured, ignore all options! |
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317 | |||
318 | test [edx + TCP_header.Flags], TH_SYN |
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319 | jz @f |
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320 | |||
4339 | hidnplayr | 321 | xor eax, eax |
3545 | hidnplayr | 322 | lodsw |
323 | rol ax, 8 |
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4339 | hidnplayr | 324 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Maxseg=%u\n", eax |
3545 | hidnplayr | 325 | call TCP_mss |
326 | @@: |
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327 | jmp .opt_loop |
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328 | |||
329 | |||
330 | .opt_window: |
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331 | lodsb |
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332 | cmp al, 3 |
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333 | jne .no_options |
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334 | |||
335 | test [edx + TCP_header.Flags], TH_SYN |
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336 | jz @f |
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337 | |||
3556 | hidnplayr | 338 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Got window scale option\n" |
3545 | hidnplayr | 339 | or [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
340 | |||
341 | lodsb |
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342 | mov [ebx + TCP_SOCKET.SND_SCALE], al |
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343 | ;;;;; TODO |
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344 | |||
345 | @@: |
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346 | jmp .opt_loop |
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347 | |||
348 | |||
349 | .opt_sack_permit: |
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350 | lodsb |
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351 | cmp al, 2 |
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352 | jne .no_options |
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353 | |||
354 | test [edx + TCP_header.Flags], TH_SYN |
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355 | jz @f |
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356 | |||
3556 | hidnplayr | 357 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Selective Acknowledgement permitted\n" |
3545 | hidnplayr | 358 | or [ebx + TCP_SOCKET.t_flags], TF_SACK_PERMIT |
359 | |||
360 | @@: |
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361 | jmp .opt_loop |
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362 | |||
363 | |||
364 | .opt_timestamp: |
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365 | lodsb |
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366 | cmp al, 10 ; length must be 10 |
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367 | jne .no_options |
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368 | |||
3556 | hidnplayr | 369 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Got timestamp option\n" |
3545 | hidnplayr | 370 | |
371 | test [edx + TCP_header.Flags], TH_SYN |
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372 | jz @f |
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373 | or [ebx + TCP_SOCKET.t_flags], TF_RCVD_TSTMP |
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374 | @@: |
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375 | |||
376 | lodsd |
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4344 | hidnplayr | 377 | bswap eax |
3545 | hidnplayr | 378 | mov [ebx + TCP_SOCKET.ts_val], eax |
379 | lodsd ; timestamp echo reply |
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380 | mov [ebx + TCP_SOCKET.ts_ecr], eax |
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381 | or [ebx + TCP_SOCKET.temp_bits], TCP_BIT_TIMESTAMP |
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382 | |||
383 | ; Since we have a timestamp, lets do the paws test right away! |
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384 | |||
385 | test [edx + TCP_header.Flags], TH_RST |
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386 | jnz .no_paws |
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387 | |||
388 | mov eax, [ebx + TCP_SOCKET.ts_recent] |
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389 | test eax, eax |
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390 | jz .no_paws |
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391 | cmp eax, [ebx + TCP_SOCKET.ts_val] |
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4344 | hidnplayr | 392 | jbe .no_paws |
3545 | hidnplayr | 393 | |
3556 | hidnplayr | 394 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: PAWS: detected an old segment\n" |
3545 | hidnplayr | 395 | |
4344 | hidnplayr | 396 | mov eax, [timestamp] |
3545 | hidnplayr | 397 | sub eax, [ebx + TCP_SOCKET.ts_recent_age] |
398 | |||
399 | pop ecx |
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400 | cmp eax, TCP_PAWS_IDLE |
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401 | jle .drop_after_ack ; TODO: update stats |
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402 | push ecx |
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403 | |||
404 | mov [ebx + TCP_SOCKET.ts_recent], 0 ; timestamp was invalid, fix it. |
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405 | .no_paws: |
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406 | jmp .opt_loop |
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407 | |||
408 | .no_options: |
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409 | |||
410 | pop ecx |
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411 | |||
412 | ;----------------------------------------------------------------------- |
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413 | ; Time to do some header prediction (Original Principle by Van Jacobson) |
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414 | |||
415 | ; There are two common cases for an uni-directional data transfer. |
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416 | ; |
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417 | ; General rule: the packets has no control flags, is in-sequence, |
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418 | ; window width didnt change and we're not retransmitting. |
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419 | ; |
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420 | ; Second rules: |
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421 | ; - If the length is 0 and the ACK moved forward, we're the sender side of the transfer. |
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422 | ; 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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423 | ; |
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424 | ; - If the length is not 0 and the ACK didn't move, we're the receiver side of the transfer. |
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425 | ; 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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426 | |||
427 | cmp [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
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428 | jnz .not_uni_xfer |
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429 | |||
430 | test [edx + TCP_header.Flags], TH_SYN + TH_FIN + TH_RST + TH_URG |
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431 | jnz .not_uni_xfer |
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432 | |||
433 | test [edx + TCP_header.Flags], TH_ACK |
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434 | jz .not_uni_xfer |
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435 | |||
436 | mov eax, [edx + TCP_header.SequenceNumber] |
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437 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
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438 | jne .not_uni_xfer |
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439 | |||
440 | mov eax, dword [edx + TCP_header.Window] |
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441 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
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442 | jne .not_uni_xfer |
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443 | |||
444 | mov eax, [ebx + TCP_SOCKET.SND_NXT] |
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445 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
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446 | jne .not_uni_xfer |
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447 | |||
448 | ;--------------------------------------- |
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449 | ; check if we are sender in the uni-xfer |
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450 | |||
451 | ; If the following 4 conditions are all true, this segment is a pure ACK. |
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452 | ; |
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453 | ; - The segment contains no data. |
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454 | test ecx, ecx |
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455 | jnz .not_sender |
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456 | |||
457 | ; - The congestion window is greater than or equal to the current send window. |
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458 | ; 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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459 | mov eax, [ebx + TCP_SOCKET.SND_CWND] |
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460 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
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461 | jb .not_uni_xfer |
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462 | |||
463 | ; - The acknowledgment field in the segment is less than or equal to the maximum sequence number sent. |
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464 | mov eax, [edx + TCP_header.AckNumber] |
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465 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
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466 | ja .not_uni_xfer |
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467 | |||
468 | ; - The acknowledgment field in the segment is greater than the largest unacknowledged sequence number. |
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469 | sub eax, [ebx + TCP_SOCKET.SND_UNA] |
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470 | jbe .not_uni_xfer |
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471 | |||
3556 | hidnplayr | 472 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Header prediction: we are sender\n" |
3545 | hidnplayr | 473 | |
474 | ;--------------------------------- |
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475 | ; Packet is a pure ACK, process it |
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476 | |||
477 | ; Delete acknowledged bytes from send buffer |
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478 | pusha |
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479 | mov ecx, eax |
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480 | lea eax, [ebx + STREAM_SOCKET.snd] |
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481 | call SOCKET_ring_free |
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482 | popa |
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483 | |||
484 | ; Update RTT estimators |
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485 | |||
486 | test [ebx + TCP_SOCKET.temp_bits], TCP_BIT_TIMESTAMP |
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487 | jz .no_timestamp_rtt |
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4344 | hidnplayr | 488 | mov eax, [timestamp] |
3545 | hidnplayr | 489 | sub eax, [ebx + TCP_SOCKET.ts_ecr] |
490 | inc eax |
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491 | call TCP_xmit_timer |
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492 | jmp .rtt_done |
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493 | |||
494 | .no_timestamp_rtt: |
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495 | cmp [ebx + TCP_SOCKET.t_rtt], 0 |
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496 | je .rtt_done |
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497 | mov eax, [edx + TCP_header.AckNumber] |
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498 | cmp eax, [ebx + TCP_SOCKET.t_rtseq] |
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499 | jbe .rtt_done |
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500 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
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501 | call TCP_xmit_timer |
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502 | |||
503 | .rtt_done: |
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504 | |||
505 | ; update window pointers |
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506 | mov eax, [edx + TCP_header.AckNumber] |
||
507 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
508 | |||
509 | ; Stop retransmit timer |
||
3600 | hidnplayr | 510 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission |
3545 | hidnplayr | 511 | |
512 | ; Unlock the socket |
||
513 | pusha |
||
514 | lea ecx, [ebx + SOCKET.mutex] |
||
515 | call mutex_unlock |
||
516 | popa |
||
517 | |||
518 | ; Awaken waiting processes |
||
519 | mov eax, ebx |
||
520 | call SOCKET_notify |
||
521 | |||
522 | ; Generate more output |
||
523 | call TCP_output |
||
524 | |||
525 | jmp .drop_no_socket |
||
526 | |||
527 | ;------------------------------------------------- |
||
528 | ; maybe we are the receiver in the uni-xfer then.. |
||
529 | |||
530 | .not_sender: |
||
531 | ; - The amount of data in the segment is greater than 0 (data count is in ecx) |
||
532 | |||
533 | ; - The acknowledgment field equals the largest unacknowledged sequence number. This means no data is acknowledged by this segment. |
||
534 | mov eax, [edx + TCP_header.AckNumber] |
||
535 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
536 | jne .not_uni_xfer |
||
537 | |||
538 | ; - The reassembly list of out-of-order segments for the connection is empty (seg_next equals tp). |
||
539 | |||
540 | ;;; TODO |
||
541 | |||
542 | ; jnz .not_uni_xfer |
||
543 | |||
544 | ; Complete processing of received data |
||
545 | |||
3556 | hidnplayr | 546 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Header prediction: we are receiving %u bytes\n", ecx |
3545 | hidnplayr | 547 | |
4339 | hidnplayr | 548 | mov esi, [dataoffset] |
3545 | hidnplayr | 549 | add esi, edx |
550 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
551 | call SOCKET_ring_write ; Add the data to the socket buffer |
||
4344 | hidnplayr | 552 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
3545 | hidnplayr | 553 | |
554 | mov eax, ebx |
||
555 | call SOCKET_notify |
||
556 | |||
557 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK ; Set delayed ack flag |
||
558 | |||
559 | jmp .drop |
||
560 | |||
561 | ;-------------------------------------------------- |
||
562 | ; Header prediction failed, do it the slow way |
||
563 | |||
564 | .not_uni_xfer: |
||
565 | |||
3556 | hidnplayr | 566 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Header prediction failed\n" |
3545 | hidnplayr | 567 | |
568 | ; Calculate receive window size |
||
569 | |||
570 | push edx |
||
571 | mov eax, SOCKETBUFFSIZE |
||
572 | sub eax, [ebx + STREAM_SOCKET.rcv.size] |
||
573 | mov edx, [ebx + TCP_SOCKET.RCV_ADV] |
||
574 | sub edx, [ebx + TCP_SOCKET.RCV_NXT] |
||
575 | cmp eax, edx |
||
576 | jg @f |
||
577 | mov eax, edx |
||
578 | @@: |
||
3556 | hidnplayr | 579 | DEBUGF DEBUG_NETWORK_VERBOSE, "Receive window size=%d\n", eax |
3545 | hidnplayr | 580 | mov [ebx + TCP_SOCKET.RCV_WND], eax |
581 | pop edx |
||
582 | |||
583 | ; If we are in listen or syn_sent state, go to that specific code right away |
||
584 | |||
585 | cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN |
||
586 | je .LISTEN |
||
587 | |||
588 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_SENT |
||
589 | je .SYN_SENT |
||
590 | |||
591 | ;---------------------------- |
||
592 | ; trim any data not in window |
||
593 | |||
4339 | hidnplayr | 594 | ; 1. Check for duplicate data at beginning of segment |
3545 | hidnplayr | 595 | |
4339 | hidnplayr | 596 | ; Calculate number of bytes we need to drop |
3545 | hidnplayr | 597 | mov eax, [ebx + TCP_SOCKET.RCV_NXT] |
598 | sub eax, [edx + TCP_header.SequenceNumber] |
||
599 | jle .no_duplicate |
||
600 | |||
3556 | hidnplayr | 601 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: %u bytes duplicate data!\n", eax |
3545 | hidnplayr | 602 | |
603 | test [edx + TCP_header.Flags], TH_SYN |
||
604 | jz .no_dup_syn |
||
605 | |||
3556 | hidnplayr | 606 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: got duplicate syn\n" |
3545 | hidnplayr | 607 | |
608 | and [edx + TCP_header.Flags], not (TH_SYN) |
||
609 | inc [edx + TCP_header.SequenceNumber] |
||
610 | |||
611 | cmp [edx + TCP_header.UrgentPointer], 1 |
||
612 | jbe @f |
||
613 | dec [edx + TCP_header.UrgentPointer] |
||
614 | jmp .dup_syn |
||
615 | @@: |
||
616 | and [edx + TCP_header.Flags], not (TH_URG) |
||
617 | .dup_syn: |
||
618 | dec eax |
||
619 | .no_dup_syn: |
||
620 | |||
4339 | hidnplayr | 621 | ; 2. Check for entire duplicate segment |
3545 | hidnplayr | 622 | cmp eax, ecx ; eax holds number of bytes to drop, ecx is data size |
623 | jb .duplicate |
||
624 | jnz @f |
||
625 | test [edx + TCP_header.Flags], TH_FIN |
||
626 | jnz .duplicate |
||
627 | @@: |
||
628 | |||
629 | ; Any valid FIN must be to the left of the window. |
||
630 | ; At this point the FIN must be out of sequence or a duplicate, drop it |
||
631 | and [edx + TCP_header.Flags], not TH_FIN |
||
632 | |||
633 | ; send an ACK and resynchronize and drop any data. |
||
634 | ; But keep on processing for RST or ACK |
||
635 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
636 | mov eax, ecx |
||
637 | |||
4339 | hidnplayr | 638 | ;;; TODO: update stats |
639 | |||
3545 | hidnplayr | 640 | ;----------------------------------------------- |
641 | ; Remove duplicate data and update urgent offset |
||
642 | |||
643 | .duplicate: |
||
4339 | hidnplayr | 644 | DEBUGF 1, "TCP_input: trimming duplicate data\n" |
645 | |||
646 | ; Trim data from left side of window |
||
647 | add [dataoffset], eax |
||
3545 | hidnplayr | 648 | add [edx + TCP_header.SequenceNumber], eax |
649 | sub ecx, eax |
||
650 | |||
651 | sub [edx + TCP_header.UrgentPointer], ax |
||
652 | jg @f |
||
653 | and [edx + TCP_header.Flags], not (TH_URG) |
||
654 | mov [edx + TCP_header.UrgentPointer], 0 |
||
655 | @@: |
||
656 | |||
657 | ;-------------------------------------------------- |
||
4339 | hidnplayr | 658 | ; Handle data that arrives after process terminates |
3545 | hidnplayr | 659 | |
660 | .no_duplicate: |
||
4339 | hidnplayr | 661 | cmp [ebx + SOCKET.PID], 0 ;;; TODO: use socket flags instead?? |
3545 | hidnplayr | 662 | jne .not_terminated |
663 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
||
664 | jbe .not_terminated |
||
665 | test ecx, ecx |
||
666 | jz .not_terminated |
||
667 | |||
668 | mov eax, ebx |
||
669 | call TCP_close |
||
4339 | hidnplayr | 670 | ;;; TODO: update stats |
3545 | hidnplayr | 671 | jmp .respond_seg_reset |
672 | |||
673 | ;---------------------------------------- |
||
4339 | hidnplayr | 674 | ; Remove data beyond right edge of window |
3545 | hidnplayr | 675 | |
676 | .not_terminated: |
||
677 | mov eax, [edx + TCP_header.SequenceNumber] |
||
678 | add eax, ecx |
||
679 | sub eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
680 | sub eax, [ebx + TCP_SOCKET.RCV_WND] ; eax now holds the number of bytes to drop |
||
681 | jle .no_excess_data |
||
682 | |||
3556 | hidnplayr | 683 | DEBUGF DEBUG_NETWORK_VERBOSE, "%d bytes beyond right edge of window\n", eax |
3545 | hidnplayr | 684 | |
685 | ;;; TODO: update stats |
||
686 | cmp eax, ecx |
||
687 | jl .dont_drop_all |
||
688 | ; If a new connection request is received while in TIME_WAIT, drop the old connection and start over, |
||
689 | ; if the sequence numbers are above the previous ones |
||
690 | |||
691 | test [edx + TCP_header.Flags], TH_SYN |
||
692 | jz .no_new_request |
||
693 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
694 | jne .no_new_request |
||
695 | ; mov edx, [ebx + TCP_SOCKET.RCV_NXT] |
||
696 | ; cmp edx, [edx + TCP_header.SequenceNumber] |
||
697 | ; add edx, 64000 ; TCP_ISSINCR FIXME |
||
698 | mov eax, ebx |
||
699 | call TCP_close |
||
700 | jmp .findpcb ; FIXME: skip code for unscaling window, ... |
||
701 | .no_new_request: |
||
702 | |||
4339 | hidnplayr | 703 | ; If window is closed, we can only take segments at window edge, and have to drop data and PUSH from |
3545 | hidnplayr | 704 | ; incoming segments. Continue processing, but remember to ACK. Otherwise drop segment and ACK |
705 | |||
706 | cmp [ebx + TCP_SOCKET.RCV_WND], 0 |
||
707 | jne .drop_after_ack |
||
4339 | hidnplayr | 708 | mov esi, [edx + TCP_header.SequenceNumber] |
709 | cmp esi, [ebx + TCP_SOCKET.RCV_NXT] |
||
3545 | hidnplayr | 710 | jne .drop_after_ack |
711 | |||
712 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
713 | ;;; TODO: update stats |
||
714 | .dont_drop_all: |
||
715 | ;;; TODO: update stats |
||
4339 | hidnplayr | 716 | DEBUGF 1, "Trimming %u bytes from the right of the window\n" |
717 | sub ecx, eax ; remove data from the right side of window (decrease data length) |
||
3545 | hidnplayr | 718 | and [ebx + TCP_SOCKET.t_flags], not (TH_PUSH or TH_FIN) |
719 | .no_excess_data: |
||
720 | |||
721 | ;----------------- |
||
4339 | hidnplayr | 722 | ; Record timestamp |
3545 | hidnplayr | 723 | |
724 | ; If last ACK falls within this segments sequence numbers, record its timestamp |
||
725 | test [ebx + TCP_SOCKET.temp_bits], TCP_BIT_TIMESTAMP |
||
726 | jz .no_timestamp |
||
727 | mov eax, [ebx + TCP_SOCKET.last_ack_sent] |
||
728 | sub eax, [edx + TCP_header.SequenceNumber] |
||
729 | jb .no_timestamp |
||
730 | test [ebx + TCP_header.Flags], TH_SYN or TH_FIN ; syn and fin occupy one byte |
||
731 | jz @f |
||
732 | dec eax |
||
733 | @@: |
||
734 | sub eax, ecx |
||
735 | jae .no_timestamp |
||
736 | |||
3556 | hidnplayr | 737 | DEBUGF DEBUG_NETWORK_VERBOSE, "Recording timestamp\n" |
3545 | hidnplayr | 738 | |
4344 | hidnplayr | 739 | mov eax, [timestamp] |
3545 | hidnplayr | 740 | mov [ebx + TCP_SOCKET.ts_recent_age], eax |
741 | mov eax, [ebx + TCP_SOCKET.ts_val] |
||
742 | mov [ebx + TCP_SOCKET.ts_recent], eax |
||
743 | .no_timestamp: |
||
744 | |||
745 | ;------------------ |
||
746 | ; Process RST flags |
||
747 | |||
748 | test [edx + TCP_header.Flags], TH_RST |
||
749 | jz .no_rst |
||
750 | |||
3556 | hidnplayr | 751 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Got an RST flag\n" |
3545 | hidnplayr | 752 | |
753 | mov eax, [ebx + TCP_SOCKET.t_state] |
||
754 | shl eax, 2 |
||
755 | jmp dword [eax + .rst_sw_list] |
||
756 | |||
757 | .rst_sw_list: |
||
758 | dd .no_rst ; TCPS_CLOSED |
||
759 | dd .no_rst ; TCPS_LISTEN |
||
760 | dd .no_rst ; TCPS_SYN_SENT |
||
761 | dd .econnrefused ; TCPS_SYN_RECEIVED |
||
762 | dd .econnreset ; TCPS_ESTABLISHED |
||
763 | dd .econnreset ; TCPS_CLOSE_WAIT |
||
764 | dd .econnreset ; TCPS_FIN_WAIT_1 |
||
765 | dd .rst_close ; TCPS_CLOSING |
||
766 | dd .rst_close ; TCPS_LAST_ACK |
||
767 | dd .econnreset ; TCPS_FIN_WAIT_2 |
||
768 | dd .rst_close ; TCPS_TIMED_WAIT |
||
769 | |||
770 | .econnrefused: |
||
3556 | hidnplayr | 771 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Connection refused\n" |
3545 | hidnplayr | 772 | |
773 | mov [ebx + SOCKET.errorcode], ECONNREFUSED |
||
774 | jmp .close |
||
775 | |||
776 | .econnreset: |
||
3556 | hidnplayr | 777 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Connection reset\n" |
3545 | hidnplayr | 778 | |
779 | mov [ebx + SOCKET.errorcode], ECONNRESET |
||
780 | |||
781 | .close: |
||
3556 | hidnplayr | 782 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Closing connection\n" |
3545 | hidnplayr | 783 | |
784 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
||
785 | ;;; TODO: update stats (tcp drops) |
||
786 | mov eax, ebx |
||
787 | call TCP_close |
||
788 | jmp .drop_no_socket |
||
789 | |||
790 | .rst_close: |
||
3556 | hidnplayr | 791 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Closing with reset\n" |
3545 | hidnplayr | 792 | |
793 | mov eax, ebx |
||
794 | call TCP_close |
||
795 | jmp .drop_no_socket |
||
796 | |||
797 | .no_rst: |
||
798 | |||
799 | ;-------------------------------------- |
||
800 | ; handle SYN-full and ACK-less segments |
||
801 | |||
802 | test [edx + TCP_header.Flags], TH_SYN |
||
803 | jz .not_syn_full |
||
804 | |||
805 | mov eax, ebx |
||
806 | mov ebx, ECONNRESET |
||
807 | call TCP_drop |
||
808 | jmp .drop_with_reset |
||
809 | .not_syn_full: |
||
810 | |||
811 | ;--------------- |
||
812 | ; ACK processing |
||
813 | |||
814 | test [edx + TCP_header.Flags], TH_ACK |
||
815 | jz .drop |
||
816 | |||
817 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
||
818 | jb .ack_processed ; states: closed, listen, syn_sent |
||
819 | ja .no_syn_rcv ; established, fin_wait_1, fin_wait_2, close_wait, closing, last_ack, time_wait |
||
820 | |||
3556 | hidnplayr | 821 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: state=syn_received\n" |
3545 | hidnplayr | 822 | |
823 | mov eax, [edx + TCP_header.AckNumber] |
||
824 | cmp [ebx + TCP_SOCKET.SND_UNA], eax |
||
825 | ja .drop_with_reset |
||
826 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
827 | ja .drop_with_reset |
||
828 | |||
829 | ;;; TODO: update stats |
||
830 | |||
831 | mov eax, ebx |
||
832 | call SOCKET_is_connected |
||
833 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
||
834 | |||
835 | ; Do window scaling? |
||
836 | |||
837 | test [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
||
838 | jz @f |
||
839 | test [ebx + TCP_SOCKET.t_flags], TF_REQ_SCALE |
||
840 | jz @f |
||
841 | |||
842 | push word [ebx + TCP_SOCKET.requested_s_scale] ; Set send and receive scale factors to the received values |
||
843 | pop word [ebx + TCP_SOCKET.SND_SCALE] |
||
844 | @@: |
||
845 | |||
846 | ;;; TODO: call TCP_reassemble |
||
847 | |||
848 | mov eax, [edx + TCP_header.SequenceNumber] |
||
849 | dec eax |
||
850 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
851 | |||
852 | .no_syn_rcv: |
||
853 | |||
854 | ;------------------------- |
||
855 | ; check for duplicate ACKs |
||
856 | |||
857 | mov eax, [edx + TCP_header.AckNumber] |
||
858 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
859 | ja .not_dup_ack |
||
860 | |||
861 | test ecx, ecx |
||
862 | jnz .reset_dupacks |
||
863 | |||
864 | mov eax, dword [edx + TCP_header.Window] |
||
865 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
866 | jne .reset_dupacks |
||
867 | |||
3556 | hidnplayr | 868 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Processing duplicate ACK\n" |
3545 | hidnplayr | 869 | |
870 | ; If we have outstanding data, other than a window probe, this is a completely duplicate ACK |
||
871 | ; (window info didnt change) The ACK is the biggest we've seen and we've seen exactly our rexmt threshold of them, |
||
872 | ; assume a packet has been dropped and retransmit it. Kludge snd_nxt & the congestion window so we send only this one packet. |
||
873 | |||
3600 | hidnplayr | 874 | test [ebx + TCP_SOCKET.timer_flags], timer_flag_retransmission |
875 | jz @f |
||
3545 | hidnplayr | 876 | |
877 | mov eax, [edx + TCP_header.AckNumber] |
||
878 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
879 | je .dup_ack |
||
880 | |||
881 | @@: |
||
882 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
||
883 | jmp .not_dup_ack |
||
884 | |||
885 | .dup_ack: |
||
886 | inc [ebx + TCP_SOCKET.t_dupacks] |
||
887 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
||
888 | jne .no_re_xmit |
||
889 | |||
890 | push [ebx + TCP_SOCKET.SND_NXT] ; >>>> |
||
891 | |||
892 | mov eax, [ebx + TCP_SOCKET.SND_WND] |
||
893 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
||
4296 | hidnplayr | 894 | jbe @f |
895 | mov eax, [ebx + TCP_SOCKET.SND_CWND] |
||
896 | @@: |
||
3545 | hidnplayr | 897 | shr eax, 1 |
898 | push edx |
||
899 | xor edx, edx |
||
900 | div [ebx + TCP_SOCKET.t_maxseg] |
||
901 | cmp eax, 2 |
||
902 | ja @f |
||
903 | xor eax, eax |
||
904 | mov al, 2 |
||
905 | @@: |
||
906 | mul [ebx + TCP_SOCKET.t_maxseg] |
||
907 | pop edx |
||
908 | mov [ebx + TCP_SOCKET.SND_SSTHRESH], eax |
||
909 | |||
3600 | hidnplayr | 910 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission ; turn off retransmission timer |
3545 | hidnplayr | 911 | mov [ebx + TCP_SOCKET.t_rtt], 0 |
912 | mov eax, [edx + TCP_header.AckNumber] |
||
913 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
914 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
915 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
916 | |||
917 | ; Unlock the socket |
||
918 | push ebx |
||
919 | lea ecx, [ebx + SOCKET.mutex] |
||
920 | call mutex_unlock |
||
921 | |||
922 | ; retransmit missing segment |
||
923 | mov eax, [esp] |
||
924 | call TCP_output |
||
925 | |||
926 | ; Lock the socket again |
||
927 | mov ecx, [esp] |
||
928 | add ecx, SOCKET.mutex |
||
929 | call mutex_lock |
||
3711 | clevermous | 930 | pop ebx |
3545 | hidnplayr | 931 | |
932 | ; Continue processing |
||
933 | xor edx, edx |
||
934 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
935 | mul [ebx + TCP_SOCKET.t_dupacks] |
||
936 | add eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
||
937 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
938 | |||
939 | pop eax ; <<<< |
||
940 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
941 | jb @f |
||
942 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
943 | @@: |
||
944 | |||
945 | jmp .drop |
||
946 | |||
947 | |||
948 | .no_re_xmit: |
||
949 | jbe .not_dup_ack |
||
950 | |||
3556 | hidnplayr | 951 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Increasing congestion window\n" |
3545 | hidnplayr | 952 | |
953 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
954 | add [ebx + TCP_SOCKET.SND_CWND], eax |
||
955 | |||
956 | ; Unlock the socket |
||
957 | push ebx |
||
958 | lea ecx, [ebx + SOCKET.mutex] |
||
959 | call mutex_unlock |
||
960 | |||
961 | ; retransmit missing segment |
||
962 | mov eax, [esp] |
||
963 | call TCP_output |
||
964 | |||
965 | ; Lock the socket again |
||
966 | mov ecx, [esp] |
||
967 | add ecx, SOCKET.mutex |
||
968 | call mutex_lock |
||
969 | pop ebx |
||
970 | |||
971 | jmp .drop |
||
972 | |||
973 | |||
974 | .not_dup_ack: |
||
975 | |||
976 | ;------------------------------------------------- |
||
977 | ; If the congestion window was inflated to account |
||
978 | ; for the other side's cached packets, retract it |
||
979 | |||
980 | mov eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
||
981 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
||
982 | ja @f |
||
983 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
||
984 | jbe @f |
||
985 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
986 | @@: |
||
987 | |||
988 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
||
989 | |||
990 | mov eax, [edx + TCP_header.AckNumber] |
||
991 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
992 | jbe @f |
||
993 | |||
994 | ;;; TODO: update stats |
||
995 | jmp .drop_after_ack |
||
996 | |||
997 | @@: |
||
998 | |||
999 | mov edi, [edx + TCP_header.AckNumber] |
||
1000 | sub edi, [ebx + TCP_SOCKET.SND_UNA] ; now we got the number of acked bytes in edi |
||
1001 | |||
1002 | ;;; TODO: update stats |
||
1003 | |||
3556 | hidnplayr | 1004 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: acceptable ACK for %u bytes\n", edi |
3545 | hidnplayr | 1005 | |
1006 | ;------------------------------------------ |
||
1007 | ; RTT measurements and retransmission timer (912-926) |
||
1008 | |||
1009 | ; If we have a timestamp, update smoothed RTT |
||
1010 | |||
1011 | test [ebx + TCP_SOCKET.temp_bits], TCP_BIT_TIMESTAMP |
||
1012 | jz .timestamp_not_present |
||
4344 | hidnplayr | 1013 | mov eax, [timestamp] |
3545 | hidnplayr | 1014 | sub eax, [ebx + TCP_SOCKET.ts_ecr] |
1015 | inc eax |
||
1016 | call TCP_xmit_timer |
||
1017 | jmp .rtt_done_ |
||
1018 | |||
1019 | ; If no timestamp but transmit timer is running and timed sequence number was acked, |
||
1020 | ; update smoothed RTT. Since we now have an RTT measurement, cancel the timer backoff |
||
1021 | ; (Phil Karn's retransmit algo) |
||
1022 | ; Recompute the initial retransmit timer |
||
1023 | |||
1024 | .timestamp_not_present: |
||
1025 | mov eax, [edx + TCP_header.AckNumber] |
||
1026 | cmp eax, [ebx + TCP_SOCKET.t_rtseq] |
||
1027 | jbe .rtt_done_ |
||
1028 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
||
1029 | test eax, eax |
||
1030 | jz .rtt_done_ |
||
1031 | call TCP_xmit_timer |
||
1032 | |||
1033 | .rtt_done_: |
||
1034 | |||
1035 | ; If all outstanding data is acked, stop retransmit timer and remember to restart (more output or persist) |
||
1036 | ; If there is more data to be acked, restart retransmit timer, using current (possible backed-off) value. |
||
1037 | |||
1038 | mov eax, [ebx + TCP_SOCKET.SND_MAX] |
||
1039 | cmp eax, [edx + TCP_header.AckNumber] |
||
1040 | jne .more_data |
||
3600 | hidnplayr | 1041 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission |
3545 | hidnplayr | 1042 | or [ebx + TCP_SOCKET.temp_bits], TCP_BIT_NEEDOUTPUT |
1043 | jmp .no_restart |
||
1044 | .more_data: |
||
3600 | hidnplayr | 1045 | test [ebx + TCP_SOCKET.timer_flags], timer_flag_persist |
1046 | jnz .no_restart |
||
3545 | hidnplayr | 1047 | |
1048 | mov eax, [ebx + TCP_SOCKET.t_rxtcur] |
||
1049 | mov [ebx + TCP_SOCKET.timer_retransmission], eax |
||
3600 | hidnplayr | 1050 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_retransmission |
3545 | hidnplayr | 1051 | .no_restart: |
1052 | |||
1053 | |||
1054 | ;------------------------------------------- |
||
1055 | ; Open congestion window in response to ACKs |
||
1056 | |||
1057 | mov esi, [ebx + TCP_SOCKET.SND_CWND] |
||
1058 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
1059 | |||
1060 | cmp esi, [ebx + TCP_SOCKET.SND_SSTHRESH] |
||
1061 | jbe @f |
||
1062 | push edx |
||
1063 | push eax |
||
1064 | mul eax |
||
1065 | div esi |
||
1066 | pop edx |
||
1067 | shr edx, 3 |
||
1068 | add eax, edx |
||
1069 | pop edx |
||
1070 | @@: |
||
1071 | |||
1072 | add esi, eax |
||
1073 | |||
1074 | push ecx |
||
1075 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
||
1076 | mov eax, TCP_max_win |
||
1077 | shl eax, cl |
||
1078 | pop ecx |
||
1079 | |||
1080 | cmp esi, eax |
||
4296 | hidnplayr | 1081 | jbe @f |
1082 | mov esi, eax |
||
1083 | @@: |
||
3545 | hidnplayr | 1084 | mov [ebx + TCP_SOCKET.SND_CWND], esi |
1085 | |||
1086 | ;------------------------------------------ |
||
1087 | ; Remove acknowledged data from send buffer |
||
1088 | |||
1089 | cmp edi, [ebx + STREAM_SOCKET.snd.size] |
||
1090 | jbe .finiacked |
||
1091 | |||
1092 | push ecx edx ebx |
||
1093 | mov ecx, [ebx + STREAM_SOCKET.snd.size] |
||
1094 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1095 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
||
1096 | call SOCKET_ring_free |
||
1097 | pop ebx edx ecx |
||
1098 | |||
3556 | hidnplayr | 1099 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: our FIN is acked\n" |
3545 | hidnplayr | 1100 | stc |
1101 | |||
1102 | jmp .wakeup |
||
1103 | |||
1104 | .finiacked: |
||
1105 | |||
1106 | push ecx edx ebx |
||
1107 | mov ecx, edi |
||
1108 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1109 | call SOCKET_ring_free |
||
1110 | pop ebx |
||
1111 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
||
1112 | pop edx ecx |
||
1113 | |||
3556 | hidnplayr | 1114 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: our FIN is not acked\n" |
3545 | hidnplayr | 1115 | clc |
1116 | |||
1117 | ;---------------------------------------- |
||
1118 | ; Wake up process waiting on send buffer |
||
1119 | |||
1120 | .wakeup: |
||
1121 | |||
1122 | pushf ; Keep the flags (Carry flag) |
||
1123 | mov eax, ebx |
||
1124 | call SOCKET_notify |
||
1125 | |||
1126 | ; Update TCPS |
||
1127 | |||
1128 | mov eax, [edx + TCP_header.AckNumber] |
||
1129 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
1130 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
1131 | jb @f |
||
1132 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1133 | @@: |
||
1134 | |||
1135 | popf |
||
1136 | |||
1137 | ; General ACK handling complete |
||
1138 | ; Now do the state-specific ones |
||
1139 | ; Carry flag is set when our FIN is acked |
||
1140 | |||
1141 | mov eax, [ebx + TCP_SOCKET.t_state] |
||
1142 | jmp dword [eax*4 + .ACK_sw_list] |
||
1143 | |||
1144 | .ACK_sw_list: |
||
1145 | dd .ack_processed ; TCPS_CLOSED |
||
1146 | dd .ack_processed ; TCPS_LISTEN |
||
1147 | dd .ack_processed ; TCPS_SYN_SENT |
||
1148 | dd .ack_processed ; TCPS_SYN_RECEIVED |
||
1149 | dd .ack_processed ; TCPS_ESTABLISHED |
||
1150 | dd .ack_processed ; TCPS_CLOSE_WAIT |
||
1151 | dd .ack_fw1 ; TCPS_FIN_WAIT_1 |
||
1152 | dd .ack_c ; TCPS_CLOSING |
||
1153 | dd .ack_la ; TCPS_LAST_ACK |
||
1154 | dd .ack_processed ; TCPS_FIN_WAIT_2 |
||
1155 | dd .ack_tw ; TCPS_TIMED_WAIT |
||
1156 | |||
1157 | |||
1158 | .ack_fw1: |
||
1159 | jnc .ack_processed |
||
1160 | |||
1161 | test [ebx + SOCKET.state], SS_CANTRCVMORE |
||
1162 | jnz @f |
||
1163 | mov eax, ebx |
||
1164 | call SOCKET_is_disconnected |
||
1165 | mov [ebx + TCP_SOCKET.timer_timed_wait], TCP_time_max_idle |
||
3600 | hidnplayr | 1166 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
3545 | hidnplayr | 1167 | @@: |
1168 | mov [ebx + TCP_SOCKET.t_state], TCPS_FIN_WAIT_2 |
||
1169 | jmp .ack_processed |
||
1170 | |||
1171 | .ack_c: |
||
1172 | jnc .ack_processed |
||
1173 | |||
1174 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
1175 | mov eax, ebx |
||
1176 | call TCP_cancel_timers |
||
1177 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
3600 | hidnplayr | 1178 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
3545 | hidnplayr | 1179 | mov eax, ebx |
1180 | call SOCKET_is_disconnected |
||
1181 | jmp .ack_processed |
||
1182 | |||
1183 | .ack_la: |
||
1184 | jnc .ack_processed |
||
1185 | |||
3652 | hidnplayr | 1186 | push ebx |
1187 | lea ecx, [ebx + SOCKET.mutex] |
||
1188 | call mutex_unlock |
||
1189 | pop ebx |
||
1190 | |||
1191 | push ebx |
||
3545 | hidnplayr | 1192 | mov eax, ebx |
1193 | call TCP_disconnect |
||
3652 | hidnplayr | 1194 | pop ebx |
3545 | hidnplayr | 1195 | |
3652 | hidnplayr | 1196 | jmp .destroy_new_socket |
1197 | |||
3545 | hidnplayr | 1198 | .ack_tw: |
1199 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
3600 | hidnplayr | 1200 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
3545 | hidnplayr | 1201 | jmp .drop_after_ack |
1202 | |||
1203 | .reset_dupacks: ; We got a new ACK, reset duplicate ACK counter |
||
1204 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
||
1205 | jmp .ack_processed |
||
1206 | |||
1207 | ;------- |
||
1208 | ; LISTEN |
||
1209 | |||
1210 | align 4 |
||
1211 | .LISTEN: |
||
1212 | |||
3556 | hidnplayr | 1213 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: state=listen\n" |
3545 | hidnplayr | 1214 | |
1215 | test [edx + TCP_header.Flags], TH_RST |
||
1216 | jnz .drop |
||
1217 | |||
1218 | test [edx + TCP_header.Flags], TH_ACK |
||
1219 | jnz .drop_with_reset |
||
1220 | |||
1221 | test [edx + TCP_header.Flags], TH_SYN |
||
1222 | jz .drop |
||
1223 | |||
1224 | ;;; TODO: check if it's a broadcast or multicast, and drop if so |
||
1225 | |||
1226 | push dword [edi] ; Ipv4 source addres |
||
1227 | pop [ebx + IP_SOCKET.RemoteIP] |
||
1228 | |||
1229 | push [edx + TCP_header.SourcePort] |
||
1230 | pop [ebx + TCP_SOCKET.RemotePort] |
||
1231 | |||
1232 | push [edx + TCP_header.SequenceNumber] |
||
1233 | pop [ebx + TCP_SOCKET.IRS] |
||
1234 | |||
1235 | mov eax, [TCP_sequence_num] |
||
1236 | add [TCP_sequence_num], 64000 / 2 |
||
1237 | mov [ebx + TCP_SOCKET.ISS], eax |
||
1238 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1239 | |||
1240 | TCP_sendseqinit ebx |
||
1241 | TCP_rcvseqinit ebx |
||
1242 | |||
1243 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
||
1244 | mov [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1245 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval ;;;; macro |
||
3600 | hidnplayr | 1246 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_keepalive |
3545 | hidnplayr | 1247 | |
1248 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1249 | call SOCKET_ring_create |
||
1250 | |||
1251 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
1252 | call SOCKET_ring_create |
||
1253 | |||
1254 | and [ebx + TCP_SOCKET.temp_bits], not TCP_BIT_DROPSOCKET |
||
1255 | |||
3674 | hidnplayr | 1256 | pusha |
1257 | mov eax, ebx |
||
1258 | call SOCKET_notify |
||
1259 | popa |
||
3545 | hidnplayr | 1260 | |
1261 | jmp .trim_then_step6 |
||
1262 | |||
1263 | ;------------ |
||
1264 | ; Active Open |
||
1265 | |||
1266 | align 4 |
||
1267 | .SYN_SENT: |
||
1268 | |||
3556 | hidnplayr | 1269 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: state=syn_sent\n" |
3545 | hidnplayr | 1270 | |
1271 | test [edx + TCP_header.Flags], TH_ACK |
||
1272 | jz @f |
||
1273 | |||
1274 | mov eax, [edx + TCP_header.AckNumber] |
||
1275 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
1276 | jbe .drop_with_reset |
||
1277 | |||
1278 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
1279 | ja .drop_with_reset |
||
1280 | @@: |
||
1281 | |||
1282 | test [edx + TCP_header.Flags], TH_RST |
||
1283 | jz @f |
||
1284 | |||
1285 | test [edx + TCP_header.Flags], TH_ACK |
||
1286 | jz .drop |
||
1287 | |||
1288 | mov eax, ebx |
||
1289 | mov ebx, ECONNREFUSED |
||
1290 | call TCP_drop |
||
1291 | |||
1292 | jmp .drop |
||
1293 | @@: |
||
1294 | |||
1295 | test [edx + TCP_header.Flags], TH_SYN |
||
1296 | jz .drop |
||
1297 | |||
1298 | ; at this point, segment seems to be valid |
||
1299 | |||
1300 | test [edx + TCP_header.Flags], TH_ACK |
||
1301 | jz .no_syn_ack |
||
1302 | |||
1303 | ; now, process received SYN in response to an active open |
||
1304 | |||
1305 | mov eax, [edx + TCP_header.AckNumber] |
||
1306 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
1307 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
1308 | jbe @f |
||
1309 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1310 | @@: |
||
1311 | |||
1312 | .no_syn_ack: |
||
3600 | hidnplayr | 1313 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission ; disable retransmission timer |
3545 | hidnplayr | 1314 | |
1315 | push [edx + TCP_header.SequenceNumber] |
||
1316 | pop [ebx + TCP_SOCKET.IRS] |
||
1317 | |||
1318 | TCP_rcvseqinit ebx |
||
1319 | |||
1320 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1321 | |||
1322 | mov eax, [ebx + TCP_SOCKET.SND_UNA] |
||
1323 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
1324 | jbe .simultaneous_open |
||
1325 | |||
1326 | test [edx + TCP_header.Flags], TH_ACK |
||
1327 | jz .simultaneous_open |
||
1328 | |||
3556 | hidnplayr | 1329 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: active open\n" |
3545 | hidnplayr | 1330 | |
1331 | ;;; TODO: update stats |
||
1332 | |||
1333 | ; set socket state to connected |
||
3674 | hidnplayr | 1334 | push eax |
1335 | mov eax, ebx |
||
1336 | call SOCKET_is_connected |
||
1337 | pop eax |
||
3545 | hidnplayr | 1338 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
1339 | |||
1340 | ; Do window scaling on this connection ? |
||
1341 | mov eax, [ebx + TCP_SOCKET.t_flags] |
||
1342 | and eax, TF_REQ_SCALE or TF_RCVD_SCALE |
||
1343 | cmp eax, TF_REQ_SCALE or TF_RCVD_SCALE |
||
1344 | jne .no_scaling |
||
1345 | |||
1346 | mov ax, word [ebx + TCP_SOCKET.requested_s_scale] |
||
1347 | mov word [ebx + TCP_SOCKET.SND_SCALE], ax |
||
1348 | .no_scaling: |
||
1349 | |||
1350 | ;;; TODO: reassemble packets queue |
||
1351 | |||
1352 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
||
1353 | test eax, eax |
||
1354 | je .trim_then_step6 |
||
1355 | call TCP_xmit_timer |
||
1356 | jmp .trim_then_step6 |
||
1357 | |||
1358 | .simultaneous_open: |
||
1359 | |||
3556 | hidnplayr | 1360 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: simultaneous open\n" |
3545 | hidnplayr | 1361 | ; We have received a syn but no ACK, so we are having a simultaneous open.. |
1362 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
||
1363 | |||
1364 | ;------------------------------------- |
||
1365 | ; Common processing for receipt of SYN |
||
1366 | |||
1367 | .trim_then_step6: |
||
1368 | |||
1369 | inc [edx + TCP_header.SequenceNumber] |
||
1370 | |||
4339 | hidnplayr | 1371 | ; Drop any received data that doesnt fit in the receive window. |
1372 | cmp ecx, [ebx + TCP_SOCKET.RCV_WND] |
||
1373 | jbe .dont_trim |
||
3545 | hidnplayr | 1374 | |
4339 | hidnplayr | 1375 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: received data does not fit in window, trimming %u bytes\n", eax |
1376 | mov ecx, [ebx + TCP_SOCKET.RCV_WND] |
||
1377 | and [edx + TCP_header.Flags], not (TH_FIN) |
||
1378 | ;;; TODO: update stats |
||
1379 | |||
1380 | .dont_trim: |
||
1381 | |||
3545 | hidnplayr | 1382 | mov eax, [edx + TCP_header.SequenceNumber] |
1383 | mov [ebx + TCP_SOCKET.RCV_UP], eax |
||
1384 | dec eax |
||
1385 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
1386 | |||
1387 | ;------- |
||
1388 | ; step 6 |
||
1389 | |||
1390 | .ack_processed: |
||
1391 | |||
3556 | hidnplayr | 1392 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: ACK processed\n" |
3545 | hidnplayr | 1393 | |
1394 | ;---------------------------------------------- |
||
1395 | ; check if we need to update window information |
||
1396 | |||
1397 | test [edx + TCP_header.Flags], TH_ACK |
||
1398 | jz .no_window_update |
||
1399 | |||
1400 | mov eax, [ebx + TCP_SOCKET.SND_WL1] |
||
1401 | cmp eax, [edx + TCP_header.SequenceNumber] |
||
1402 | jb .update_window |
||
1403 | ja @f |
||
1404 | |||
1405 | mov eax, [ebx + TCP_SOCKET.SND_WL2] |
||
1406 | cmp eax, [edx + TCP_header.AckNumber] |
||
1407 | jb .update_window |
||
1408 | ja .no_window_update |
||
1409 | @@: |
||
1410 | |||
1411 | mov eax, dword [edx + TCP_header.Window] |
||
1412 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
1413 | jbe .no_window_update |
||
1414 | |||
1415 | .update_window: |
||
1416 | |||
1417 | ;;; TODO: update stats (Keep track of pure window updates) |
||
1418 | |||
1419 | mov eax, dword [edx + TCP_header.Window] |
||
1420 | cmp eax, [ebx + TCP_SOCKET.max_sndwnd] |
||
1421 | jbe @f |
||
1422 | mov [ebx + TCP_SOCKET.max_sndwnd], eax |
||
1423 | @@: |
||
1424 | mov [ebx + TCP_SOCKET.SND_WND], eax |
||
1425 | |||
3556 | hidnplayr | 1426 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Updating window to %u\n", eax |
3545 | hidnplayr | 1427 | |
1428 | push [edx + TCP_header.SequenceNumber] |
||
1429 | pop [ebx + TCP_SOCKET.SND_WL1] |
||
1430 | |||
1431 | push [edx + TCP_header.AckNumber] |
||
1432 | pop [ebx + TCP_SOCKET.SND_WL2] |
||
1433 | |||
1434 | or [ebx + TCP_SOCKET.temp_bits], TCP_BIT_NEEDOUTPUT |
||
1435 | |||
1436 | .no_window_update: |
||
1437 | |||
1438 | ;----------------- |
||
1439 | ; process URG flag |
||
1440 | |||
1441 | test [edx + TCP_header.Flags], TH_URG |
||
1442 | jz .not_urgent |
||
1443 | |||
1444 | cmp [edx + TCP_header.UrgentPointer], 0 |
||
1445 | jz .not_urgent |
||
1446 | |||
1447 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
1448 | je .not_urgent |
||
1449 | |||
1450 | ; Ignore bogus urgent offsets |
||
1451 | |||
1452 | movzx eax, [edx + TCP_header.UrgentPointer] |
||
1453 | add eax, [ebx + STREAM_SOCKET.rcv.size] |
||
1454 | cmp eax, SOCKET_MAXDATA |
||
1455 | jbe .not_urgent |
||
1456 | |||
1457 | mov [edx + TCP_header.UrgentPointer], 0 |
||
1458 | and [edx + TCP_header.Flags], not (TH_URG) |
||
1459 | jmp .do_data |
||
1460 | |||
1461 | .not_urgent: |
||
1462 | |||
1463 | ; processing of received urgent pointer |
||
1464 | |||
1465 | ;;; TODO (1051-1093) |
||
1466 | |||
1467 | |||
1468 | ;--------------------------------------- |
||
1469 | ; process the data in the segment (1094) |
||
1470 | |||
1471 | .do_data: |
||
1472 | |||
1473 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
1474 | jae .final_processing |
||
1475 | |||
1476 | test [edx + TCP_header.Flags], TH_FIN |
||
1477 | jnz @f |
||
1478 | |||
1479 | test ecx, ecx |
||
3756 | hidnplayr | 1480 | jz .final_processing |
3545 | hidnplayr | 1481 | @@: |
1482 | |||
1483 | ; The segment is in order? |
||
1484 | mov eax, [edx + TCP_header.SequenceNumber] |
||
1485 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
1486 | jne .out_of_order |
||
1487 | |||
1488 | ; The reassembly queue is empty? |
||
1489 | cmp [ebx + TCP_SOCKET.seg_next], 0 |
||
1490 | jne .out_of_order |
||
1491 | |||
1492 | ; The connection is established? |
||
1493 | cmp [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
||
1494 | jne .out_of_order |
||
1495 | |||
1496 | ; Ok, lets do this.. Set delayed ACK flag and copy data into socket buffer |
||
1497 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK |
||
1498 | |||
1499 | pusha |
||
4339 | hidnplayr | 1500 | mov esi, [dataoffset] |
3545 | hidnplayr | 1501 | add esi, edx |
1502 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
1503 | call SOCKET_ring_write ; Add the data to the socket buffer |
||
1504 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
||
1505 | popa |
||
1506 | |||
1507 | ; Wake up the sleeping process |
||
1508 | mov eax, ebx |
||
1509 | call SOCKET_notify |
||
1510 | |||
1511 | jmp .data_done |
||
1512 | |||
1513 | .out_of_order: |
||
4339 | hidnplayr | 1514 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP data is out of order!\nSequencenumber is %u, we expected %u.\n", \ |
1515 | [edx + TCP_header.SequenceNumber], [ebx + TCP_SOCKET.RCV_NXT] |
||
3545 | hidnplayr | 1516 | |
1517 | ; Uh-oh, some data is out of order, lets call TCP reassemble for help |
||
1518 | |||
1519 | call TCP_reassemble |
||
1520 | |||
4339 | hidnplayr | 1521 | ; Generate ACK immediately, to let the other end know that a segment was received out of order, |
1522 | ; and to tell it what sequence number is expected. This aids the fast-retransmit algorithm. |
||
3545 | hidnplayr | 1523 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1524 | |||
1525 | .data_done: |
||
1526 | |||
1527 | ;--------------- |
||
1528 | ; FIN processing |
||
1529 | |||
1530 | test [edx + TCP_header.Flags], TH_FIN |
||
1531 | jz .final_processing |
||
1532 | |||
3556 | hidnplayr | 1533 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Processing FIN\n" |
3545 | hidnplayr | 1534 | |
1535 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
1536 | jae .not_first_fin |
||
1537 | |||
3556 | hidnplayr | 1538 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: First FIN for this connection\n" |
3545 | hidnplayr | 1539 | |
1540 | mov eax, ebx |
||
1541 | call SOCKET_cant_recv_more |
||
1542 | |||
1543 | mov [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1544 | inc [ebx + TCP_SOCKET.RCV_NXT] |
||
1545 | |||
1546 | .not_first_fin: |
||
1547 | mov eax, [ebx + TCP_SOCKET.t_state] |
||
1548 | shl eax, 2 |
||
1549 | jmp dword [eax + .FIN_sw_list] |
||
1550 | |||
1551 | .FIN_sw_list: |
||
1552 | dd .final_processing ; TCPS_CLOSED |
||
1553 | dd .final_processing ; TCPS_LISTEN |
||
1554 | dd .final_processing ; TCPS_SYN_SENT |
||
1555 | dd .fin_syn_est ; TCPS_SYN_RECEIVED |
||
1556 | dd .fin_syn_est ; TCPS_ESTABLISHED |
||
1557 | dd .final_processing ; TCPS_CLOSE_WAIT |
||
1558 | dd .fin_wait1 ; TCPS_FIN_WAIT_1 |
||
1559 | dd .final_processing ; TCPS_CLOSING |
||
1560 | dd .final_processing ; TCPS_LAST_ACK |
||
1561 | dd .fin_wait2 ; TCPS_FIN_WAIT_2 |
||
1562 | dd .fin_timed ; TCPS_TIMED_WAIT |
||
1563 | |||
1564 | .fin_syn_est: |
||
1565 | |||
1566 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
||
1567 | jmp .final_processing |
||
1568 | |||
1569 | .fin_wait1: |
||
1570 | |||
1571 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSING |
||
1572 | jmp .final_processing |
||
1573 | |||
1574 | .fin_wait2: |
||
1575 | |||
1576 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
1577 | mov eax, ebx |
||
1578 | call TCP_cancel_timers |
||
1579 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
3600 | hidnplayr | 1580 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
3545 | hidnplayr | 1581 | call SOCKET_is_disconnected |
1582 | jmp .final_processing |
||
1583 | |||
1584 | .fin_timed: |
||
1585 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
3600 | hidnplayr | 1586 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
3545 | hidnplayr | 1587 | jmp .final_processing |
1588 | |||
1589 | |||
1590 | .drop_after_ack: |
||
3556 | hidnplayr | 1591 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Drop after ACK\n" |
3545 | hidnplayr | 1592 | |
1593 | push edx ebx |
||
1594 | lea ecx, [ebx + SOCKET.mutex] |
||
1595 | call mutex_unlock |
||
1596 | pop eax edx |
||
1597 | |||
1598 | test [edx + TCP_header.Flags], TH_RST |
||
1599 | jnz .dumpit |
||
1600 | |||
1601 | or [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1602 | jmp .need_output |
||
1603 | |||
1604 | .drop_with_reset: |
||
3556 | hidnplayr | 1605 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Drop with reset\n" |
3545 | hidnplayr | 1606 | |
1607 | push ebx edx |
||
1608 | lea ecx, [ebx + SOCKET.mutex] |
||
1609 | call mutex_unlock |
||
1610 | pop edx ebx |
||
1611 | |||
1612 | test [edx + TCP_header.Flags], TH_RST |
||
1613 | jnz .dumpit |
||
1614 | |||
1615 | ;;; if its a multicast/broadcast, also drop |
||
1616 | |||
1617 | test [edx + TCP_header.Flags], TH_ACK |
||
1618 | jnz .respond_ack |
||
1619 | |||
1620 | test [edx + TCP_header.Flags], TH_SYN |
||
1621 | jnz .respond_syn |
||
1622 | jmp .dumpit |
||
1623 | |||
1624 | ;----------------- |
||
1625 | ; Final processing |
||
1626 | |||
1627 | .final_processing: |
||
3556 | hidnplayr | 1628 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Final processing\n" |
3545 | hidnplayr | 1629 | |
1630 | push ebx |
||
1631 | lea ecx, [ebx + SOCKET.mutex] |
||
1632 | call mutex_unlock |
||
1633 | pop eax |
||
1634 | |||
1635 | test [eax + TCP_SOCKET.temp_bits], TCP_BIT_NEEDOUTPUT |
||
1636 | jnz .need_output |
||
1637 | |||
1638 | test [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1639 | jz .dumpit |
||
3556 | hidnplayr | 1640 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: ACK now!\n" |
3545 | hidnplayr | 1641 | |
1642 | .need_output: |
||
3556 | hidnplayr | 1643 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: need output\n" |
3545 | hidnplayr | 1644 | call TCP_output |
1645 | |||
1646 | .dumpit: |
||
3556 | hidnplayr | 1647 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: dumping\n" |
3545 | hidnplayr | 1648 | |
3861 | hidnplayr | 1649 | call NET_packet_free |
3545 | hidnplayr | 1650 | jmp .loop |
1651 | |||
1652 | ;--------- |
||
1653 | ; Respond |
||
1654 | |||
1655 | .respond_ack: |
||
1656 | push ebx |
||
1657 | mov cl, TH_RST |
||
1658 | call TCP_respond |
||
1659 | pop ebx |
||
1660 | jmp .destroy_new_socket |
||
1661 | |||
1662 | .respond_syn: |
||
1663 | push ebx |
||
1664 | mov cl, TH_RST + TH_ACK |
||
1665 | call TCP_respond |
||
1666 | pop ebx |
||
1667 | jmp .destroy_new_socket |
||
1668 | |||
3647 | hidnplayr | 1669 | .no_socket: |
1670 | |||
1671 | pusha |
||
1672 | mov ecx, socket_mutex |
||
1673 | call mutex_unlock |
||
1674 | popa |
||
1675 | |||
3545 | hidnplayr | 1676 | .respond_seg_reset: |
1677 | test [edx + TCP_header.Flags], TH_RST |
||
1678 | jnz .drop_no_socket |
||
1679 | |||
1680 | ;;; TODO: if its a multicast/broadcast, also drop |
||
1681 | |||
1682 | test [edx + TCP_header.Flags], TH_ACK |
||
1683 | jnz .respond_seg_ack |
||
1684 | |||
1685 | test [edx + TCP_header.Flags], TH_SYN |
||
1686 | jnz .respond_seg_syn |
||
1687 | |||
1688 | jmp .drop_no_socket |
||
1689 | |||
1690 | .respond_seg_ack: |
||
1691 | mov cl, TH_RST |
||
1692 | call TCP_respond_segment |
||
1693 | jmp .drop_no_socket |
||
1694 | |||
1695 | .respond_seg_syn: |
||
1696 | mov cl, TH_RST + TH_ACK |
||
1697 | call TCP_respond_segment |
||
1698 | jmp .drop_no_socket |
||
1699 | |||
1700 | ;----- |
||
1701 | ; Drop |
||
1702 | |||
1703 | .drop: |
||
3556 | hidnplayr | 1704 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Dropping segment\n" |
3545 | hidnplayr | 1705 | |
1706 | pusha |
||
1707 | lea ecx, [ebx + SOCKET.mutex] |
||
1708 | call mutex_unlock |
||
1709 | popa |
||
1710 | |||
1711 | .destroy_new_socket: |
||
1712 | test [ebx + TCP_SOCKET.temp_bits], TCP_BIT_DROPSOCKET |
||
1713 | jz .drop_no_socket |
||
1714 | |||
1715 | mov eax, ebx |
||
1716 | call SOCKET_free |
||
1717 | |||
1718 | .drop_no_socket: |
||
3556 | hidnplayr | 1719 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Drop (no socket)\n" |
3545 | hidnplayr | 1720 | |
3861 | hidnplayr | 1721 | call NET_packet_free |
3545 | hidnplayr | 1722 | jmp .loop |
4339 | hidnplayr | 1723 | |
1724 | endp |