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