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Rev | Author | Line No. | Line |
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3545 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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5363 | yogev_ezra | 3 | ;; Copyright (C) KolibriOS team 2004-2015. All rights reserved. ;; |
3545 | hidnplayr | 4 | ;; Distributed under terms of the GNU General Public License ;; |
5 | ;; ;; |
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6 | ;; Part of the TCP/IP network stack for KolibriOS ;; |
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7 | ;; ;; |
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8 | ;; Written by hidnplayr@kolibrios.org ;; |
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9 | ;; ;; |
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5133 | hidnplayr | 10 | ;; Based on the algorithms used in 4.4BSD ;; |
3545 | hidnplayr | 11 | ;; ;; |
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 | |||
4850 | mario79 | 17 | $Revision: 5442 $ |
3545 | hidnplayr | 18 | |
19 | ;----------------------------------------------------------------- |
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20 | ; |
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21 | ; TCP_input: |
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22 | ; |
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23 | ; Add a segment to the incoming TCP queue |
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24 | ; |
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25 | ; IN: [esp] = ptr to buffer |
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26 | ; [esp+4] = buffer size (dont care) |
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27 | ; ebx = ptr to device struct |
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28 | ; ecx = segment size |
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29 | ; esi = ptr to TCP segment |
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30 | ; edi = ptr to ipv4 source address, followed by ipv4 dest address |
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31 | ; |
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32 | ; OUT: / |
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33 | ; |
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34 | ;----------------------------------------------------------------- |
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35 | |||
36 | align 4 |
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37 | TCP_input: |
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38 | |||
39 | ; record the current time |
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40 | mov eax, [timer_ticks] ; in 1/100 seconds |
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41 | mov [esp + 4], eax |
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42 | |||
43 | push ebx ecx esi edi ; mind the order |
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44 | mov esi, esp |
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45 | |||
46 | add_to_queue TCP_queue, TCP_QUEUE_SIZE, sizeof.TCP_queue_entry, .fail |
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47 | add esp, sizeof.TCP_queue_entry |
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48 | |||
3644 | hidnplayr | 49 | call NET_ptr_to_num4 |
50 | inc [TCP_segments_rx + edi] |
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51 | |||
3545 | hidnplayr | 52 | xor edx, edx |
53 | mov eax, [TCP_input_event] |
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54 | mov ebx, [eax + EVENT.id] |
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55 | xor esi, esi |
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56 | call raise_event |
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57 | |||
58 | ret |
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59 | |||
60 | .fail: |
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3556 | hidnplayr | 61 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP incoming queue is full, discarding packet!\n" |
3545 | hidnplayr | 62 | |
3644 | hidnplayr | 63 | call NET_ptr_to_num4 |
64 | inc [TCP_segments_missed + edi] |
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3545 | hidnplayr | 65 | |
66 | add esp, sizeof.TCP_queue_entry - 8 |
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3861 | hidnplayr | 67 | call NET_packet_free |
3545 | hidnplayr | 68 | add esp, 4 |
69 | |||
70 | ret |
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71 | |||
72 | |||
73 | |||
74 | |||
75 | align 4 |
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4339 | hidnplayr | 76 | proc TCP_process_input |
3545 | hidnplayr | 77 | |
4339 | hidnplayr | 78 | locals |
79 | dataoffset dd ? |
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4344 | hidnplayr | 80 | timestamp dd ? |
4347 | hidnplayr | 81 | temp_bits db ? |
4339 | hidnplayr | 82 | endl |
83 | |||
3545 | hidnplayr | 84 | xor esi, esi |
85 | mov ecx, MANUAL_DESTROY |
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86 | call create_event |
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87 | mov [TCP_input_event], eax |
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88 | |||
89 | .wait: |
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90 | mov eax, [TCP_input_event] |
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91 | mov ebx, [eax + EVENT.id] |
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92 | call wait_event |
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93 | |||
94 | .loop: |
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95 | get_from_queue TCP_queue, TCP_QUEUE_SIZE, sizeof.TCP_queue_entry, .wait |
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96 | |||
97 | push [esi + TCP_queue_entry.timestamp] |
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4344 | hidnplayr | 98 | pop [timestamp] |
3545 | hidnplayr | 99 | push [esi + TCP_queue_entry.buffer_ptr] |
100 | |||
101 | mov ebx, [esi + TCP_queue_entry.device_ptr] |
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102 | mov ecx, [esi + TCP_queue_entry.segment_size] |
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103 | mov edi, [esi + TCP_queue_entry.ip_ptr] ; ptr to ipv4 source address, followed by ipv4 destination address |
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104 | mov esi, [esi + TCP_queue_entry.segment_ptr] ; change esi last |
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105 | |||
3556 | hidnplayr | 106 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: size=%u time=%d\n", ecx, [timer_ticks] |
3545 | hidnplayr | 107 | |
108 | mov edx, esi |
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109 | |||
110 | cmp ebx, LOOPBACK_DEVICE |
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111 | je .checksum_ok |
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112 | |||
113 | ; re-calculate the checksum (if not already done by hw) |
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4388 | hidnplayr | 114 | test [ebx + NET_DEVICE.hwacc], NET_HWACC_TCP_IPv4_IN |
115 | jnz .checksum_ok |
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3545 | hidnplayr | 116 | |
117 | push ecx esi |
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118 | pushw [esi + TCP_header.Checksum] |
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119 | mov [esi + TCP_header.Checksum], 0 |
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120 | TCP_checksum (edi), (edi+4) |
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121 | pop cx ; previous checksum |
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122 | cmp cx, dx |
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123 | pop edx ecx |
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124 | jne .drop_no_socket |
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125 | .checksum_ok: |
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126 | |||
127 | ; Verify the data offset |
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4339 | hidnplayr | 128 | movzx eax, [edx + TCP_header.DataOffset] |
129 | and al, 0xf0 ; Calculate TCP segment header size (throwing away unused reserved bits in TCP header) |
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130 | shr al, 2 |
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131 | cmp al, sizeof.TCP_header ; Now see if it's at least the size of a standard TCP header |
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132 | jb .drop_no_socket ; If not, drop the packet |
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133 | mov [dataoffset], eax |
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3545 | hidnplayr | 134 | |
135 | sub ecx, eax ; substract TCP header size from total segment size |
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136 | jb .drop_no_socket ; If total segment size is less then the advertised header size, drop packet |
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3556 | hidnplayr | 137 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: %u bytes of data\n", ecx |
3545 | hidnplayr | 138 | |
139 | ;------------------------------------------- |
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140 | ; Convert Big-endian values to little endian |
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141 | |||
142 | ntohd [edx + TCP_header.SequenceNumber] |
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143 | ntohd [edx + TCP_header.AckNumber] |
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144 | |||
145 | ntohw [edx + TCP_header.Window] |
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146 | ntohw [edx + TCP_header.UrgentPointer] |
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147 | |||
148 | ;------------------------ |
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149 | ; Find the socket pointer |
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150 | |||
151 | ; IP Packet TCP Destination Port = local Port |
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152 | ; (IP Packet SenderAddress = Remote IP) OR (Remote IP = 0) |
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153 | ; (IP Packet TCP Source Port = remote Port) OR (remote Port = 0) |
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154 | |||
155 | .findpcb: |
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3647 | hidnplayr | 156 | pusha |
157 | mov ecx, socket_mutex |
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158 | call mutex_lock |
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159 | popa |
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160 | |||
3545 | hidnplayr | 161 | mov ebx, net_sockets |
162 | mov si, [edx + TCP_header.DestinationPort] |
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163 | |||
164 | .socket_loop: |
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165 | mov ebx, [ebx + SOCKET.NextPtr] |
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166 | or ebx, ebx |
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3647 | hidnplayr | 167 | jz .no_socket ;respond_seg_reset |
3545 | hidnplayr | 168 | |
169 | cmp [ebx + SOCKET.Domain], AF_INET4 |
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170 | jne .socket_loop |
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171 | |||
172 | cmp [ebx + SOCKET.Protocol], IP_PROTO_TCP |
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173 | jne .socket_loop |
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174 | |||
175 | cmp [ebx + TCP_SOCKET.LocalPort], si |
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176 | jne .socket_loop |
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177 | |||
178 | mov eax, [ebx + IP_SOCKET.RemoteIP] |
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179 | cmp eax, [edi] ; Ipv4 source address |
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180 | je @f |
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181 | test eax, eax |
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182 | jnz .socket_loop |
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183 | @@: |
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184 | |||
185 | mov ax, [ebx + TCP_SOCKET.RemotePort] |
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186 | cmp [edx + TCP_header.SourcePort], ax |
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187 | je .found_socket |
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188 | test ax, ax |
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189 | jnz .socket_loop |
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190 | .found_socket: ; ebx now contains the socketpointer |
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3647 | hidnplayr | 191 | pusha |
192 | mov ecx, socket_mutex |
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193 | call mutex_unlock |
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194 | popa |
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195 | |||
3556 | hidnplayr | 196 | 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 | 197 | |
198 | ;---------------------------- |
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199 | ; Check if socket isnt closed |
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200 | |||
201 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
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202 | je .drop_no_socket |
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203 | |||
204 | ;---------------- |
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205 | ; Lock the socket |
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206 | |||
207 | pusha |
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208 | lea ecx, [ebx + SOCKET.mutex] |
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209 | call mutex_lock |
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210 | popa |
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211 | |||
3556 | hidnplayr | 212 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: socket locked\n" |
3545 | hidnplayr | 213 | |
214 | ;--------------------------- |
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215 | ; disable all temporary bits |
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216 | |||
4347 | hidnplayr | 217 | mov [temp_bits], 0 |
3545 | hidnplayr | 218 | |
219 | ;--------------------------------------- |
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220 | ; unscale the window into a 32 bit value |
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221 | |||
222 | movzx eax, [edx + TCP_header.Window] |
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223 | push ecx |
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224 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
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225 | shl eax, cl |
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226 | mov dword [edx + TCP_header.Window], eax ; word after window is checksum, we dont need checksum anymore |
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227 | pop ecx |
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228 | |||
229 | ;--------------------------------------- |
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230 | ; Are we accepting incoming connections? |
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231 | |||
232 | test [ebx + SOCKET.options], SO_ACCEPTCON |
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233 | jz .no_accept |
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234 | |||
3556 | hidnplayr | 235 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Accepting new connection\n" |
3545 | hidnplayr | 236 | |
237 | pusha |
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238 | lea ecx, [ebx + SOCKET.mutex] |
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239 | call mutex_unlock |
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240 | popa |
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241 | |||
242 | push ecx edx esi edi ;;; |
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243 | call SOCKET_fork |
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244 | pop edi esi edx ecx |
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245 | |||
246 | test eax, eax |
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247 | jz .drop_no_socket |
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248 | |||
249 | mov ebx, eax |
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250 | |||
4347 | hidnplayr | 251 | mov [temp_bits], TCP_BIT_DROPSOCKET |
3545 | hidnplayr | 252 | |
253 | push dword [edi + 4] ; Ipv4 destination addres |
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254 | pop [ebx + IP_SOCKET.LocalIP] |
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255 | |||
256 | push [edx + TCP_header.DestinationPort] |
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257 | pop [ebx + TCP_SOCKET.LocalPort] |
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258 | |||
259 | mov [ebx + TCP_SOCKET.t_state], TCPS_LISTEN |
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260 | .no_accept: |
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261 | |||
262 | |||
263 | ;------------------------------------- |
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264 | ; Reset idle timer and keepalive timer |
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265 | |||
266 | mov [ebx + TCP_SOCKET.t_idle], 0 |
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267 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_idle |
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3600 | hidnplayr | 268 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_keepalive |
3545 | hidnplayr | 269 | |
270 | ;-------------------- |
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271 | ; Process TCP options |
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272 | |||
4339 | hidnplayr | 273 | ;;; FIXME: for LISTEN, options should be called after we determined route, we need it for MSS |
274 | ;;; cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN ; no options when in listen state |
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275 | ;;; jz .not_uni_xfer ; also no header prediction |
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276 | |||
3545 | hidnplayr | 277 | push ecx |
278 | |||
4339 | hidnplayr | 279 | mov ecx, [dataoffset] |
3545 | hidnplayr | 280 | cmp ecx, sizeof.TCP_header ; Does header contain any options? |
281 | je .no_options |
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282 | |||
3556 | hidnplayr | 283 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Segment has options\n" |
3545 | hidnplayr | 284 | |
285 | add ecx, edx |
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286 | lea esi, [edx + sizeof.TCP_header] |
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287 | |||
288 | .opt_loop: |
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289 | cmp esi, ecx ; are we scanning outside of header? |
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290 | jae .no_options |
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291 | lodsb |
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292 | cmp al, TCP_OPT_EOL ; end of option list? |
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293 | je .no_options |
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294 | cmp al, TCP_OPT_NOP |
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295 | je .opt_loop |
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296 | cmp al, TCP_OPT_MAXSEG |
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297 | je .opt_maxseg |
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298 | cmp al, TCP_OPT_WINDOW |
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299 | je .opt_window |
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300 | cmp al, TCP_OPT_SACK_PERMIT |
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301 | je .opt_sack_permit |
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302 | ; cmp al, TCP_OPT_SACK |
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303 | ; je .opt_sack |
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304 | cmp al, TCP_OPT_TIMESTAMP |
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305 | je .opt_timestamp |
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3556 | hidnplayr | 306 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: unknown option:%u\n", al |
3545 | hidnplayr | 307 | jmp .no_options ; If we reach here, some unknown options were received, skip them all! |
308 | |||
309 | .opt_maxseg: |
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310 | lodsb |
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311 | cmp al, 4 |
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312 | jne .no_options ; error occured, ignore all options! |
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313 | |||
314 | test [edx + TCP_header.Flags], TH_SYN |
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315 | jz @f |
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316 | |||
4339 | hidnplayr | 317 | xor eax, eax |
3545 | hidnplayr | 318 | lodsw |
319 | rol ax, 8 |
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4339 | hidnplayr | 320 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Maxseg=%u\n", eax |
3545 | hidnplayr | 321 | call TCP_mss |
322 | @@: |
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323 | jmp .opt_loop |
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324 | |||
325 | |||
326 | .opt_window: |
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327 | lodsb |
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328 | cmp al, 3 |
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329 | jne .no_options |
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330 | |||
331 | test [edx + TCP_header.Flags], TH_SYN |
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332 | jz @f |
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333 | |||
3556 | hidnplayr | 334 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Got window scale option\n" |
3545 | hidnplayr | 335 | or [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
336 | |||
337 | lodsb |
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338 | mov [ebx + TCP_SOCKET.SND_SCALE], al |
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339 | ;;;;; TODO |
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340 | |||
341 | @@: |
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342 | jmp .opt_loop |
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343 | |||
344 | |||
345 | .opt_sack_permit: |
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346 | lodsb |
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347 | cmp al, 2 |
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348 | jne .no_options |
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349 | |||
350 | test [edx + TCP_header.Flags], TH_SYN |
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351 | jz @f |
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352 | |||
3556 | hidnplayr | 353 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Selective Acknowledgement permitted\n" |
3545 | hidnplayr | 354 | or [ebx + TCP_SOCKET.t_flags], TF_SACK_PERMIT |
355 | |||
356 | @@: |
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357 | jmp .opt_loop |
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358 | |||
359 | |||
360 | .opt_timestamp: |
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361 | lodsb |
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362 | cmp al, 10 ; length must be 10 |
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363 | jne .no_options |
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364 | |||
3556 | hidnplayr | 365 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Got timestamp option\n" |
3545 | hidnplayr | 366 | |
367 | test [edx + TCP_header.Flags], TH_SYN |
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368 | jz @f |
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369 | or [ebx + TCP_SOCKET.t_flags], TF_RCVD_TSTMP |
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370 | @@: |
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371 | |||
372 | lodsd |
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4344 | hidnplayr | 373 | bswap eax |
3545 | hidnplayr | 374 | mov [ebx + TCP_SOCKET.ts_val], eax |
375 | lodsd ; timestamp echo reply |
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376 | mov [ebx + TCP_SOCKET.ts_ecr], eax |
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4347 | hidnplayr | 377 | or [temp_bits], TCP_BIT_TIMESTAMP |
3545 | hidnplayr | 378 | |
379 | ; Since we have a timestamp, lets do the paws test right away! |
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380 | |||
381 | test [edx + TCP_header.Flags], TH_RST |
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382 | jnz .no_paws |
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383 | |||
384 | mov eax, [ebx + TCP_SOCKET.ts_recent] |
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385 | test eax, eax |
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386 | jz .no_paws |
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387 | cmp eax, [ebx + TCP_SOCKET.ts_val] |
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4344 | hidnplayr | 388 | jbe .no_paws |
3545 | hidnplayr | 389 | |
3556 | hidnplayr | 390 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: PAWS: detected an old segment\n" |
3545 | hidnplayr | 391 | |
4344 | hidnplayr | 392 | mov eax, [timestamp] |
3545 | hidnplayr | 393 | sub eax, [ebx + TCP_SOCKET.ts_recent_age] |
394 | |||
395 | pop ecx |
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396 | cmp eax, TCP_PAWS_IDLE |
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5442 | hidnplayr | 397 | jle .paws_drop |
3545 | hidnplayr | 398 | push ecx |
399 | mov [ebx + TCP_SOCKET.ts_recent], 0 ; timestamp was invalid, fix it. |
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400 | .no_paws: |
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401 | jmp .opt_loop |
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402 | |||
5442 | hidnplayr | 403 | .paws_drop: |
404 | inc [TCPS_rcvduppack] ; update stats |
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405 | add [TCPS_rcvdupbyte], ecx |
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406 | inc [TCPS_pawsdrop] |
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407 | jmp .drop_after_ack |
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408 | |||
3545 | hidnplayr | 409 | .no_options: |
410 | |||
411 | pop ecx |
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412 | |||
413 | ;----------------------------------------------------------------------- |
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414 | ; Time to do some header prediction (Original Principle by Van Jacobson) |
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415 | |||
416 | ; There are two common cases for an uni-directional data transfer. |
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417 | ; |
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418 | ; General rule: the packets has no control flags, is in-sequence, |
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419 | ; window width didnt change and we're not retransmitting. |
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420 | ; |
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421 | ; Second rules: |
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422 | ; - If the length is 0 and the ACK moved forward, we're the sender side of the transfer. |
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423 | ; 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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424 | ; |
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425 | ; - If the length is not 0 and the ACK didn't move, we're the receiver side of the transfer. |
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426 | ; 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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427 | |||
428 | cmp [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
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429 | jnz .not_uni_xfer |
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430 | |||
431 | test [edx + TCP_header.Flags], TH_SYN + TH_FIN + TH_RST + TH_URG |
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432 | jnz .not_uni_xfer |
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433 | |||
434 | test [edx + TCP_header.Flags], TH_ACK |
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435 | jz .not_uni_xfer |
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436 | |||
437 | mov eax, [edx + TCP_header.SequenceNumber] |
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438 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
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439 | jne .not_uni_xfer |
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440 | |||
441 | mov eax, dword [edx + TCP_header.Window] |
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442 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
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443 | jne .not_uni_xfer |
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444 | |||
445 | mov eax, [ebx + TCP_SOCKET.SND_NXT] |
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446 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
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447 | jne .not_uni_xfer |
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448 | |||
449 | ;--------------------------------------- |
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450 | ; check if we are sender in the uni-xfer |
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451 | |||
452 | ; If the following 4 conditions are all true, this segment is a pure ACK. |
||
453 | ; |
||
454 | ; - The segment contains no data. |
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455 | test ecx, ecx |
||
456 | jnz .not_sender |
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457 | |||
458 | ; - The congestion window is greater than or equal to the current send window. |
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459 | ; 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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460 | mov eax, [ebx + TCP_SOCKET.SND_CWND] |
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461 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
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462 | jb .not_uni_xfer |
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463 | |||
464 | ; - The acknowledgment field in the segment is less than or equal to the maximum sequence number sent. |
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465 | mov eax, [edx + TCP_header.AckNumber] |
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466 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
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467 | ja .not_uni_xfer |
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468 | |||
469 | ; - The acknowledgment field in the segment is greater than the largest unacknowledged sequence number. |
||
470 | sub eax, [ebx + TCP_SOCKET.SND_UNA] |
||
471 | jbe .not_uni_xfer |
||
472 | |||
3556 | hidnplayr | 473 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Header prediction: we are sender\n" |
3545 | hidnplayr | 474 | |
475 | ;--------------------------------- |
||
476 | ; Packet is a pure ACK, process it |
||
477 | |||
478 | ; Delete acknowledged bytes from send buffer |
||
479 | pusha |
||
480 | mov ecx, eax |
||
481 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
482 | call SOCKET_ring_free |
||
483 | popa |
||
484 | |||
485 | ; Update RTT estimators |
||
486 | |||
4347 | hidnplayr | 487 | test [temp_bits], TCP_BIT_TIMESTAMP |
3545 | hidnplayr | 488 | jz .no_timestamp_rtt |
4344 | hidnplayr | 489 | mov eax, [timestamp] |
3545 | hidnplayr | 490 | sub eax, [ebx + TCP_SOCKET.ts_ecr] |
491 | inc eax |
||
492 | call TCP_xmit_timer |
||
493 | jmp .rtt_done |
||
494 | |||
495 | .no_timestamp_rtt: |
||
496 | cmp [ebx + TCP_SOCKET.t_rtt], 0 |
||
497 | je .rtt_done |
||
498 | mov eax, [edx + TCP_header.AckNumber] |
||
499 | cmp eax, [ebx + TCP_SOCKET.t_rtseq] |
||
500 | jbe .rtt_done |
||
501 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
||
502 | call TCP_xmit_timer |
||
503 | |||
504 | .rtt_done: |
||
505 | |||
506 | ; update window pointers |
||
507 | mov eax, [edx + TCP_header.AckNumber] |
||
508 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
509 | |||
510 | ; Stop retransmit timer |
||
3600 | hidnplayr | 511 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission |
3545 | hidnplayr | 512 | |
513 | ; Unlock the socket |
||
514 | pusha |
||
515 | lea ecx, [ebx + SOCKET.mutex] |
||
516 | call mutex_unlock |
||
517 | popa |
||
518 | |||
519 | ; Awaken waiting processes |
||
520 | mov eax, ebx |
||
521 | call SOCKET_notify |
||
522 | |||
523 | ; Generate more output |
||
524 | call TCP_output |
||
525 | |||
526 | jmp .drop_no_socket |
||
527 | |||
528 | ;------------------------------------------------- |
||
529 | ; maybe we are the receiver in the uni-xfer then.. |
||
530 | |||
531 | .not_sender: |
||
532 | ; - The amount of data in the segment is greater than 0 (data count is in ecx) |
||
533 | |||
534 | ; - The acknowledgment field equals the largest unacknowledged sequence number. This means no data is acknowledged by this segment. |
||
535 | mov eax, [edx + TCP_header.AckNumber] |
||
536 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
537 | jne .not_uni_xfer |
||
538 | |||
5133 | hidnplayr | 539 | ; - The reassembly list of out-of-order segments for the connection is empty. |
540 | cmp [ebx + TCP_SOCKET.seg_next], 0 |
||
541 | jne .not_uni_xfer |
||
3545 | hidnplayr | 542 | |
543 | ; Complete processing of received data |
||
544 | |||
3556 | hidnplayr | 545 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Header prediction: we are receiving %u bytes\n", ecx |
3545 | hidnplayr | 546 | |
4339 | hidnplayr | 547 | mov esi, [dataoffset] |
3545 | hidnplayr | 548 | add esi, edx |
549 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
550 | call SOCKET_ring_write ; Add the data to the socket buffer |
||
4344 | hidnplayr | 551 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
3545 | hidnplayr | 552 | |
553 | mov eax, ebx |
||
554 | call SOCKET_notify |
||
555 | |||
556 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK ; Set delayed ack flag |
||
557 | |||
558 | jmp .drop |
||
559 | |||
560 | ;-------------------------------------------------- |
||
561 | ; Header prediction failed, do it the slow way |
||
562 | |||
563 | .not_uni_xfer: |
||
564 | |||
3556 | hidnplayr | 565 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Header prediction failed\n" |
3545 | hidnplayr | 566 | |
567 | ; Calculate receive window size |
||
568 | push edx |
||
4366 | hidnplayr | 569 | mov eax, SOCKET_MAXDATA |
3545 | hidnplayr | 570 | sub eax, [ebx + STREAM_SOCKET.rcv.size] |
4366 | hidnplayr | 571 | DEBUGF DEBUG_NETWORK_VERBOSE, "Space in receive buffer=%d\n", eax |
3545 | hidnplayr | 572 | mov edx, [ebx + TCP_SOCKET.RCV_ADV] |
573 | sub edx, [ebx + TCP_SOCKET.RCV_NXT] |
||
4366 | hidnplayr | 574 | DEBUGF DEBUG_NETWORK_VERBOSE, "Current advertised window=%d\n", edx |
3545 | hidnplayr | 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 | |||
5442 | hidnplayr | 638 | inc [TCPS_rcvpartduppack] |
639 | |||
4339 | hidnplayr | 640 | ;;; TODO: update stats |
641 | |||
3545 | hidnplayr | 642 | ;----------------------------------------------- |
643 | ; Remove duplicate data and update urgent offset |
||
644 | |||
645 | .duplicate: |
||
4387 | hidnplayr | 646 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: trimming duplicate data\n" |
4339 | hidnplayr | 647 | |
648 | ; Trim data from left side of window |
||
649 | add [dataoffset], eax |
||
3545 | hidnplayr | 650 | add [edx + TCP_header.SequenceNumber], eax |
651 | sub ecx, eax |
||
652 | |||
653 | sub [edx + TCP_header.UrgentPointer], ax |
||
654 | jg @f |
||
655 | and [edx + TCP_header.Flags], not (TH_URG) |
||
656 | mov [edx + TCP_header.UrgentPointer], 0 |
||
657 | @@: |
||
658 | |||
659 | ;-------------------------------------------------- |
||
4339 | hidnplayr | 660 | ; Handle data that arrives after process terminates |
3545 | hidnplayr | 661 | |
662 | .no_duplicate: |
||
4339 | hidnplayr | 663 | cmp [ebx + SOCKET.PID], 0 ;;; TODO: use socket flags instead?? |
3545 | hidnplayr | 664 | jne .not_terminated |
665 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
||
666 | jbe .not_terminated |
||
667 | test ecx, ecx |
||
668 | jz .not_terminated |
||
669 | |||
670 | mov eax, ebx |
||
671 | call TCP_close |
||
5442 | hidnplayr | 672 | inc [TCPS_rcvafterclose] |
3545 | hidnplayr | 673 | jmp .respond_seg_reset |
674 | |||
675 | ;---------------------------------------- |
||
4339 | hidnplayr | 676 | ; Remove data beyond right edge of window |
3545 | hidnplayr | 677 | |
678 | .not_terminated: |
||
679 | mov eax, [edx + TCP_header.SequenceNumber] |
||
680 | add eax, ecx |
||
681 | sub eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
682 | sub eax, [ebx + TCP_SOCKET.RCV_WND] ; eax now holds the number of bytes to drop |
||
683 | jle .no_excess_data |
||
684 | |||
3556 | hidnplayr | 685 | DEBUGF DEBUG_NETWORK_VERBOSE, "%d bytes beyond right edge of window\n", eax |
3545 | hidnplayr | 686 | |
687 | ;;; TODO: update stats |
||
688 | cmp eax, ecx |
||
689 | jl .dont_drop_all |
||
690 | ; If a new connection request is received while in TIME_WAIT, drop the old connection and start over, |
||
691 | ; if the sequence numbers are above the previous ones |
||
692 | |||
693 | test [edx + TCP_header.Flags], TH_SYN |
||
694 | jz .no_new_request |
||
695 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
696 | jne .no_new_request |
||
697 | ; mov edx, [ebx + TCP_SOCKET.RCV_NXT] |
||
698 | ; cmp edx, [edx + TCP_header.SequenceNumber] |
||
699 | ; add edx, 64000 ; TCP_ISSINCR FIXME |
||
700 | mov eax, ebx |
||
701 | call TCP_close |
||
702 | jmp .findpcb ; FIXME: skip code for unscaling window, ... |
||
703 | .no_new_request: |
||
704 | |||
4339 | hidnplayr | 705 | ; If window is closed, we can only take segments at window edge, and have to drop data and PUSH from |
3545 | hidnplayr | 706 | ; incoming segments. Continue processing, but remember to ACK. Otherwise drop segment and ACK |
707 | |||
708 | cmp [ebx + TCP_SOCKET.RCV_WND], 0 |
||
709 | jne .drop_after_ack |
||
4339 | hidnplayr | 710 | mov esi, [edx + TCP_header.SequenceNumber] |
711 | cmp esi, [ebx + TCP_SOCKET.RCV_NXT] |
||
3545 | hidnplayr | 712 | jne .drop_after_ack |
713 | |||
714 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
715 | ;;; TODO: update stats |
||
716 | .dont_drop_all: |
||
717 | ;;; TODO: update stats |
||
4347 | hidnplayr | 718 | DEBUGF DEBUG_NETWORK_VERBOSE, "Trimming %u bytes from the right of the window\n" |
4339 | hidnplayr | 719 | sub ecx, eax ; remove data from the right side of window (decrease data length) |
4347 | hidnplayr | 720 | and [edx + TCP_header.Flags], not (TH_PUSH or TH_FIN) |
3545 | hidnplayr | 721 | .no_excess_data: |
722 | |||
723 | ;----------------- |
||
4339 | hidnplayr | 724 | ; Record timestamp |
3545 | hidnplayr | 725 | |
726 | ; If last ACK falls within this segments sequence numbers, record its timestamp |
||
4347 | hidnplayr | 727 | test [temp_bits], TCP_BIT_TIMESTAMP |
3545 | hidnplayr | 728 | jz .no_timestamp |
729 | mov eax, [ebx + TCP_SOCKET.last_ack_sent] |
||
730 | sub eax, [edx + TCP_header.SequenceNumber] |
||
731 | jb .no_timestamp |
||
732 | test [ebx + TCP_header.Flags], TH_SYN or TH_FIN ; syn and fin occupy one byte |
||
733 | jz @f |
||
734 | dec eax |
||
735 | @@: |
||
736 | sub eax, ecx |
||
737 | jae .no_timestamp |
||
738 | |||
3556 | hidnplayr | 739 | DEBUGF DEBUG_NETWORK_VERBOSE, "Recording timestamp\n" |
3545 | hidnplayr | 740 | |
4344 | hidnplayr | 741 | mov eax, [timestamp] |
3545 | hidnplayr | 742 | mov [ebx + TCP_SOCKET.ts_recent_age], eax |
743 | mov eax, [ebx + TCP_SOCKET.ts_val] |
||
744 | mov [ebx + TCP_SOCKET.ts_recent], eax |
||
745 | .no_timestamp: |
||
746 | |||
747 | ;------------------ |
||
748 | ; Process RST flags |
||
749 | |||
750 | test [edx + TCP_header.Flags], TH_RST |
||
751 | jz .no_rst |
||
752 | |||
3556 | hidnplayr | 753 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Got an RST flag\n" |
3545 | hidnplayr | 754 | |
755 | mov eax, [ebx + TCP_SOCKET.t_state] |
||
756 | shl eax, 2 |
||
757 | jmp dword [eax + .rst_sw_list] |
||
758 | |||
759 | .rst_sw_list: |
||
760 | dd .no_rst ; TCPS_CLOSED |
||
761 | dd .no_rst ; TCPS_LISTEN |
||
762 | dd .no_rst ; TCPS_SYN_SENT |
||
763 | dd .econnrefused ; TCPS_SYN_RECEIVED |
||
764 | dd .econnreset ; TCPS_ESTABLISHED |
||
765 | dd .econnreset ; TCPS_CLOSE_WAIT |
||
766 | dd .econnreset ; TCPS_FIN_WAIT_1 |
||
767 | dd .rst_close ; TCPS_CLOSING |
||
768 | dd .rst_close ; TCPS_LAST_ACK |
||
769 | dd .econnreset ; TCPS_FIN_WAIT_2 |
||
770 | dd .rst_close ; TCPS_TIMED_WAIT |
||
771 | |||
772 | .econnrefused: |
||
3556 | hidnplayr | 773 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Connection refused\n" |
3545 | hidnplayr | 774 | |
775 | mov [ebx + SOCKET.errorcode], ECONNREFUSED |
||
776 | jmp .close |
||
777 | |||
778 | .econnreset: |
||
3556 | hidnplayr | 779 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Connection reset\n" |
3545 | hidnplayr | 780 | |
781 | mov [ebx + SOCKET.errorcode], ECONNRESET |
||
782 | |||
783 | .close: |
||
3556 | hidnplayr | 784 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Closing connection\n" |
3545 | hidnplayr | 785 | |
786 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
||
787 | ;;; TODO: update stats (tcp drops) |
||
788 | mov eax, ebx |
||
789 | call TCP_close |
||
790 | jmp .drop_no_socket |
||
791 | |||
792 | .rst_close: |
||
3556 | hidnplayr | 793 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Closing with reset\n" |
3545 | hidnplayr | 794 | |
795 | mov eax, ebx |
||
796 | call TCP_close |
||
797 | jmp .drop_no_socket |
||
798 | |||
799 | .no_rst: |
||
800 | |||
801 | ;-------------------------------------- |
||
802 | ; handle SYN-full and ACK-less segments |
||
803 | |||
804 | test [edx + TCP_header.Flags], TH_SYN |
||
805 | jz .not_syn_full |
||
806 | |||
807 | mov eax, ebx |
||
808 | mov ebx, ECONNRESET |
||
809 | call TCP_drop |
||
810 | jmp .drop_with_reset |
||
811 | .not_syn_full: |
||
812 | |||
813 | ;--------------- |
||
814 | ; ACK processing |
||
815 | |||
816 | test [edx + TCP_header.Flags], TH_ACK |
||
817 | jz .drop |
||
818 | |||
819 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
||
820 | jb .ack_processed ; states: closed, listen, syn_sent |
||
821 | ja .no_syn_rcv ; established, fin_wait_1, fin_wait_2, close_wait, closing, last_ack, time_wait |
||
822 | |||
3556 | hidnplayr | 823 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: state=syn_received\n" |
3545 | hidnplayr | 824 | |
825 | mov eax, [edx + TCP_header.AckNumber] |
||
826 | cmp [ebx + TCP_SOCKET.SND_UNA], eax |
||
827 | ja .drop_with_reset |
||
828 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
829 | ja .drop_with_reset |
||
830 | |||
831 | ;;; TODO: update stats |
||
832 | |||
833 | mov eax, ebx |
||
834 | call SOCKET_is_connected |
||
835 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
||
836 | |||
837 | ; Do window scaling? |
||
838 | |||
839 | test [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
||
840 | jz @f |
||
841 | test [ebx + TCP_SOCKET.t_flags], TF_REQ_SCALE |
||
842 | jz @f |
||
843 | |||
844 | push word [ebx + TCP_SOCKET.requested_s_scale] ; Set send and receive scale factors to the received values |
||
845 | pop word [ebx + TCP_SOCKET.SND_SCALE] |
||
846 | @@: |
||
847 | |||
5133 | hidnplayr | 848 | call TCP_reassemble |
3545 | hidnplayr | 849 | |
850 | mov eax, [edx + TCP_header.SequenceNumber] |
||
851 | dec eax |
||
852 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
853 | |||
854 | .no_syn_rcv: |
||
855 | |||
856 | ;------------------------- |
||
857 | ; check for duplicate ACKs |
||
858 | |||
859 | mov eax, [edx + TCP_header.AckNumber] |
||
860 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
861 | ja .not_dup_ack |
||
862 | |||
863 | test ecx, ecx |
||
864 | jnz .reset_dupacks |
||
865 | |||
866 | mov eax, dword [edx + TCP_header.Window] |
||
867 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
868 | jne .reset_dupacks |
||
869 | |||
3556 | hidnplayr | 870 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Processing duplicate ACK\n" |
3545 | hidnplayr | 871 | |
872 | ; If we have outstanding data, other than a window probe, this is a completely duplicate ACK |
||
873 | ; (window info didnt change) The ACK is the biggest we've seen and we've seen exactly our rexmt threshold of them, |
||
874 | ; assume a packet has been dropped and retransmit it. Kludge snd_nxt & the congestion window so we send only this one packet. |
||
875 | |||
3600 | hidnplayr | 876 | test [ebx + TCP_SOCKET.timer_flags], timer_flag_retransmission |
877 | jz @f |
||
3545 | hidnplayr | 878 | |
879 | mov eax, [edx + TCP_header.AckNumber] |
||
880 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
881 | je .dup_ack |
||
882 | |||
883 | @@: |
||
884 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
||
885 | jmp .not_dup_ack |
||
886 | |||
887 | .dup_ack: |
||
888 | inc [ebx + TCP_SOCKET.t_dupacks] |
||
889 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
||
890 | jne .no_re_xmit |
||
891 | |||
892 | push [ebx + TCP_SOCKET.SND_NXT] ; >>>> |
||
893 | |||
894 | mov eax, [ebx + TCP_SOCKET.SND_WND] |
||
895 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
||
4296 | hidnplayr | 896 | jbe @f |
897 | mov eax, [ebx + TCP_SOCKET.SND_CWND] |
||
898 | @@: |
||
3545 | hidnplayr | 899 | shr eax, 1 |
900 | push edx |
||
901 | xor edx, edx |
||
902 | div [ebx + TCP_SOCKET.t_maxseg] |
||
903 | cmp eax, 2 |
||
904 | ja @f |
||
905 | xor eax, eax |
||
906 | mov al, 2 |
||
907 | @@: |
||
908 | mul [ebx + TCP_SOCKET.t_maxseg] |
||
909 | pop edx |
||
910 | mov [ebx + TCP_SOCKET.SND_SSTHRESH], eax |
||
911 | |||
3600 | hidnplayr | 912 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission ; turn off retransmission timer |
3545 | hidnplayr | 913 | mov [ebx + TCP_SOCKET.t_rtt], 0 |
914 | mov eax, [edx + TCP_header.AckNumber] |
||
915 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
916 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
917 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
918 | |||
919 | ; Unlock the socket |
||
920 | push ebx |
||
921 | lea ecx, [ebx + SOCKET.mutex] |
||
922 | call mutex_unlock |
||
923 | |||
924 | ; retransmit missing segment |
||
925 | mov eax, [esp] |
||
926 | call TCP_output |
||
927 | |||
928 | ; Lock the socket again |
||
929 | mov ecx, [esp] |
||
930 | add ecx, SOCKET.mutex |
||
931 | call mutex_lock |
||
3711 | clevermous | 932 | pop ebx |
3545 | hidnplayr | 933 | |
934 | ; Continue processing |
||
935 | xor edx, edx |
||
936 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
937 | mul [ebx + TCP_SOCKET.t_dupacks] |
||
938 | add eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
||
939 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
940 | |||
941 | pop eax ; <<<< |
||
942 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
943 | jb @f |
||
944 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
945 | @@: |
||
946 | |||
947 | jmp .drop |
||
948 | |||
949 | |||
950 | .no_re_xmit: |
||
951 | jbe .not_dup_ack |
||
952 | |||
3556 | hidnplayr | 953 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Increasing congestion window\n" |
3545 | hidnplayr | 954 | |
955 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
956 | add [ebx + TCP_SOCKET.SND_CWND], eax |
||
957 | |||
958 | ; Unlock the socket |
||
959 | push ebx |
||
960 | lea ecx, [ebx + SOCKET.mutex] |
||
961 | call mutex_unlock |
||
962 | |||
963 | ; retransmit missing segment |
||
964 | mov eax, [esp] |
||
965 | call TCP_output |
||
966 | |||
967 | ; Lock the socket again |
||
968 | mov ecx, [esp] |
||
969 | add ecx, SOCKET.mutex |
||
970 | call mutex_lock |
||
971 | pop ebx |
||
972 | |||
973 | jmp .drop |
||
974 | |||
975 | |||
976 | .not_dup_ack: |
||
977 | |||
978 | ;------------------------------------------------- |
||
979 | ; If the congestion window was inflated to account |
||
980 | ; for the other side's cached packets, retract it |
||
981 | |||
982 | mov eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
||
983 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
||
984 | ja @f |
||
985 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
||
986 | jbe @f |
||
987 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
988 | @@: |
||
989 | |||
990 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
||
991 | |||
992 | mov eax, [edx + TCP_header.AckNumber] |
||
993 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
994 | jbe @f |
||
5442 | hidnplayr | 995 | inc [TCPS_rcvacktoomuch] |
3545 | hidnplayr | 996 | jmp .drop_after_ack |
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 |
||
5442 | hidnplayr | 1001 | inc [TCPS_rcvackpack] |
1002 | add [TCPS_rcvackbyte], edi |
||
3556 | hidnplayr | 1003 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: acceptable ACK for %u bytes\n", edi |
3545 | hidnplayr | 1004 | |
1005 | ;------------------------------------------ |
||
4347 | hidnplayr | 1006 | ; RTT measurements and retransmission timer |
3545 | hidnplayr | 1007 | |
1008 | ; If we have a timestamp, update smoothed RTT |
||
1009 | |||
4347 | hidnplayr | 1010 | test [temp_bits], TCP_BIT_TIMESTAMP |
3545 | hidnplayr | 1011 | jz .timestamp_not_present |
4344 | hidnplayr | 1012 | mov eax, [timestamp] |
3545 | hidnplayr | 1013 | sub eax, [ebx + TCP_SOCKET.ts_ecr] |
1014 | inc eax |
||
1015 | call TCP_xmit_timer |
||
1016 | jmp .rtt_done_ |
||
1017 | |||
1018 | ; If no timestamp but transmit timer is running and timed sequence number was acked, |
||
1019 | ; update smoothed RTT. Since we now have an RTT measurement, cancel the timer backoff |
||
1020 | ; (Phil Karn's retransmit algo) |
||
1021 | ; Recompute the initial retransmit timer |
||
1022 | |||
1023 | .timestamp_not_present: |
||
1024 | mov eax, [edx + TCP_header.AckNumber] |
||
1025 | cmp eax, [ebx + TCP_SOCKET.t_rtseq] |
||
1026 | jbe .rtt_done_ |
||
1027 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
||
1028 | test eax, eax |
||
1029 | jz .rtt_done_ |
||
1030 | call TCP_xmit_timer |
||
1031 | |||
1032 | .rtt_done_: |
||
1033 | |||
1034 | ; If all outstanding data is acked, stop retransmit timer and remember to restart (more output or persist) |
||
1035 | ; If there is more data to be acked, restart retransmit timer, using current (possible backed-off) value. |
||
1036 | |||
1037 | mov eax, [ebx + TCP_SOCKET.SND_MAX] |
||
1038 | cmp eax, [edx + TCP_header.AckNumber] |
||
1039 | jne .more_data |
||
3600 | hidnplayr | 1040 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission |
4347 | hidnplayr | 1041 | or [temp_bits], TCP_BIT_NEEDOUTPUT |
3545 | hidnplayr | 1042 | jmp .no_restart |
1043 | .more_data: |
||
3600 | hidnplayr | 1044 | test [ebx + TCP_SOCKET.timer_flags], timer_flag_persist |
1045 | jnz .no_restart |
||
3545 | hidnplayr | 1046 | |
1047 | mov eax, [ebx + TCP_SOCKET.t_rxtcur] |
||
1048 | mov [ebx + TCP_SOCKET.timer_retransmission], eax |
||
3600 | hidnplayr | 1049 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_retransmission |
3545 | hidnplayr | 1050 | .no_restart: |
1051 | |||
1052 | |||
1053 | ;------------------------------------------- |
||
1054 | ; Open congestion window in response to ACKs |
||
1055 | |||
1056 | mov esi, [ebx + TCP_SOCKET.SND_CWND] |
||
1057 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
1058 | |||
1059 | cmp esi, [ebx + TCP_SOCKET.SND_SSTHRESH] |
||
1060 | jbe @f |
||
1061 | push edx |
||
1062 | push eax |
||
1063 | mul eax |
||
1064 | div esi |
||
1065 | pop edx |
||
1066 | shr edx, 3 |
||
1067 | add eax, edx |
||
1068 | pop edx |
||
1069 | @@: |
||
1070 | |||
1071 | add esi, eax |
||
1072 | |||
1073 | push ecx |
||
1074 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
||
1075 | mov eax, TCP_max_win |
||
1076 | shl eax, cl |
||
1077 | pop ecx |
||
1078 | |||
1079 | cmp esi, eax |
||
4296 | hidnplayr | 1080 | jbe @f |
1081 | mov esi, eax |
||
1082 | @@: |
||
3545 | hidnplayr | 1083 | mov [ebx + TCP_SOCKET.SND_CWND], esi |
1084 | |||
1085 | ;------------------------------------------ |
||
1086 | ; Remove acknowledged data from send buffer |
||
1087 | |||
1088 | cmp edi, [ebx + STREAM_SOCKET.snd.size] |
||
1089 | jbe .finiacked |
||
1090 | |||
1091 | push ecx edx ebx |
||
1092 | mov ecx, [ebx + STREAM_SOCKET.snd.size] |
||
1093 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1094 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
||
1095 | call SOCKET_ring_free |
||
1096 | pop ebx edx ecx |
||
1097 | |||
3556 | hidnplayr | 1098 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: our FIN is acked\n" |
5133 | hidnplayr | 1099 | or [temp_bits], TCP_BIT_FIN_IS_ACKED |
3545 | hidnplayr | 1100 | jmp .wakeup |
1101 | |||
1102 | .finiacked: |
||
1103 | |||
1104 | push ecx edx ebx |
||
1105 | mov ecx, edi |
||
1106 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1107 | call SOCKET_ring_free |
||
1108 | pop ebx |
||
1109 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
||
1110 | pop edx ecx |
||
1111 | |||
3556 | hidnplayr | 1112 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: our FIN is not acked\n" |
3545 | hidnplayr | 1113 | |
1114 | ;---------------------------------------- |
||
1115 | ; Wake up process waiting on send buffer |
||
1116 | |||
1117 | .wakeup: |
||
1118 | mov eax, ebx |
||
1119 | call SOCKET_notify |
||
1120 | |||
1121 | ; Update TCPS |
||
1122 | mov eax, [edx + TCP_header.AckNumber] |
||
1123 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
1124 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
1125 | jb @f |
||
1126 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1127 | @@: |
||
1128 | |||
1129 | ; General ACK handling complete |
||
1130 | ; Now do the state-specific ones |
||
1131 | ; Carry flag is set when our FIN is acked |
||
1132 | |||
1133 | mov eax, [ebx + TCP_SOCKET.t_state] |
||
1134 | jmp dword [eax*4 + .ACK_sw_list] |
||
1135 | |||
1136 | .ACK_sw_list: |
||
1137 | dd .ack_processed ; TCPS_CLOSED |
||
1138 | dd .ack_processed ; TCPS_LISTEN |
||
1139 | dd .ack_processed ; TCPS_SYN_SENT |
||
1140 | dd .ack_processed ; TCPS_SYN_RECEIVED |
||
1141 | dd .ack_processed ; TCPS_ESTABLISHED |
||
1142 | dd .ack_processed ; TCPS_CLOSE_WAIT |
||
1143 | dd .ack_fw1 ; TCPS_FIN_WAIT_1 |
||
1144 | dd .ack_c ; TCPS_CLOSING |
||
1145 | dd .ack_la ; TCPS_LAST_ACK |
||
1146 | dd .ack_processed ; TCPS_FIN_WAIT_2 |
||
1147 | dd .ack_tw ; TCPS_TIMED_WAIT |
||
1148 | |||
1149 | |||
1150 | .ack_fw1: |
||
5133 | hidnplayr | 1151 | test [temp_bits], TCP_BIT_FIN_IS_ACKED |
1152 | jz .ack_processed |
||
3545 | hidnplayr | 1153 | |
1154 | test [ebx + SOCKET.state], SS_CANTRCVMORE |
||
1155 | jnz @f |
||
1156 | mov eax, ebx |
||
1157 | call SOCKET_is_disconnected |
||
1158 | mov [ebx + TCP_SOCKET.timer_timed_wait], TCP_time_max_idle |
||
3600 | hidnplayr | 1159 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
3545 | hidnplayr | 1160 | @@: |
1161 | mov [ebx + TCP_SOCKET.t_state], TCPS_FIN_WAIT_2 |
||
1162 | jmp .ack_processed |
||
1163 | |||
1164 | .ack_c: |
||
5133 | hidnplayr | 1165 | test [temp_bits], TCP_BIT_FIN_IS_ACKED |
1166 | jz .ack_processed |
||
3545 | hidnplayr | 1167 | |
1168 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
1169 | mov eax, ebx |
||
1170 | call TCP_cancel_timers |
||
1171 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
3600 | hidnplayr | 1172 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
3545 | hidnplayr | 1173 | mov eax, ebx |
1174 | call SOCKET_is_disconnected |
||
1175 | jmp .ack_processed |
||
1176 | |||
1177 | .ack_la: |
||
5133 | hidnplayr | 1178 | test [temp_bits], TCP_BIT_FIN_IS_ACKED |
1179 | jz .ack_processed |
||
3545 | hidnplayr | 1180 | |
3652 | hidnplayr | 1181 | push ebx |
1182 | lea ecx, [ebx + SOCKET.mutex] |
||
1183 | call mutex_unlock |
||
1184 | pop ebx |
||
1185 | |||
3545 | hidnplayr | 1186 | mov eax, ebx |
4366 | hidnplayr | 1187 | call TCP_close |
1188 | jmp .drop_no_socket |
||
3545 | hidnplayr | 1189 | |
1190 | .ack_tw: |
||
1191 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
3600 | hidnplayr | 1192 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
3545 | hidnplayr | 1193 | jmp .drop_after_ack |
1194 | |||
1195 | .reset_dupacks: ; We got a new ACK, reset duplicate ACK counter |
||
1196 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
||
1197 | jmp .ack_processed |
||
1198 | |||
1199 | ;------- |
||
1200 | ; LISTEN |
||
1201 | |||
1202 | align 4 |
||
1203 | .LISTEN: |
||
1204 | |||
3556 | hidnplayr | 1205 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: state=listen\n" |
3545 | hidnplayr | 1206 | |
1207 | test [edx + TCP_header.Flags], TH_RST |
||
1208 | jnz .drop |
||
1209 | |||
1210 | test [edx + TCP_header.Flags], TH_ACK |
||
1211 | jnz .drop_with_reset |
||
1212 | |||
1213 | test [edx + TCP_header.Flags], TH_SYN |
||
1214 | jz .drop |
||
1215 | |||
5442 | hidnplayr | 1216 | inc [TCPS_accepts] ; update stats |
1217 | |||
3545 | hidnplayr | 1218 | ;;; TODO: check if it's a broadcast or multicast, and drop if so |
1219 | |||
1220 | push dword [edi] ; Ipv4 source addres |
||
1221 | pop [ebx + IP_SOCKET.RemoteIP] |
||
1222 | |||
1223 | push [edx + TCP_header.SourcePort] |
||
1224 | pop [ebx + TCP_SOCKET.RemotePort] |
||
1225 | |||
1226 | push [edx + TCP_header.SequenceNumber] |
||
1227 | pop [ebx + TCP_SOCKET.IRS] |
||
1228 | |||
1229 | mov eax, [TCP_sequence_num] |
||
1230 | add [TCP_sequence_num], 64000 / 2 |
||
1231 | mov [ebx + TCP_SOCKET.ISS], eax |
||
1232 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1233 | |||
1234 | TCP_sendseqinit ebx |
||
1235 | TCP_rcvseqinit ebx |
||
1236 | |||
1237 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
||
4347 | hidnplayr | 1238 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
3545 | hidnplayr | 1239 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval ;;;; macro |
3600 | hidnplayr | 1240 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_keepalive |
3545 | hidnplayr | 1241 | |
1242 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1243 | call SOCKET_ring_create |
||
5155 | hidnplayr | 1244 | test eax, eax |
1245 | jz .drop |
||
3545 | hidnplayr | 1246 | |
1247 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
1248 | call SOCKET_ring_create |
||
5155 | hidnplayr | 1249 | test eax, eax |
1250 | jz .drop |
||
3545 | hidnplayr | 1251 | |
4347 | hidnplayr | 1252 | and [temp_bits], not TCP_BIT_DROPSOCKET |
3545 | hidnplayr | 1253 | |
3674 | hidnplayr | 1254 | pusha |
1255 | mov eax, ebx |
||
1256 | call SOCKET_notify |
||
1257 | popa |
||
3545 | hidnplayr | 1258 | |
5133 | hidnplayr | 1259 | jmp .trim |
3545 | hidnplayr | 1260 | |
1261 | ;------------ |
||
1262 | ; Active Open |
||
1263 | |||
1264 | align 4 |
||
1265 | .SYN_SENT: |
||
1266 | |||
3556 | hidnplayr | 1267 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: state=syn_sent\n" |
3545 | hidnplayr | 1268 | |
1269 | test [edx + TCP_header.Flags], TH_ACK |
||
1270 | jz @f |
||
1271 | |||
1272 | mov eax, [edx + TCP_header.AckNumber] |
||
1273 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
1274 | jbe .drop_with_reset |
||
1275 | |||
1276 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
1277 | ja .drop_with_reset |
||
1278 | @@: |
||
1279 | |||
1280 | test [edx + TCP_header.Flags], TH_RST |
||
1281 | jz @f |
||
1282 | |||
1283 | test [edx + TCP_header.Flags], TH_ACK |
||
1284 | jz .drop |
||
1285 | |||
1286 | mov eax, ebx |
||
1287 | mov ebx, ECONNREFUSED |
||
1288 | call TCP_drop |
||
1289 | |||
1290 | jmp .drop |
||
1291 | @@: |
||
1292 | |||
1293 | test [edx + TCP_header.Flags], TH_SYN |
||
1294 | jz .drop |
||
1295 | |||
1296 | ; at this point, segment seems to be valid |
||
1297 | |||
1298 | test [edx + TCP_header.Flags], TH_ACK |
||
1299 | jz .no_syn_ack |
||
1300 | |||
1301 | ; now, process received SYN in response to an active open |
||
1302 | |||
1303 | mov eax, [edx + TCP_header.AckNumber] |
||
1304 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
1305 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
1306 | jbe @f |
||
1307 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1308 | @@: |
||
1309 | |||
1310 | .no_syn_ack: |
||
3600 | hidnplayr | 1311 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission ; disable retransmission timer |
3545 | hidnplayr | 1312 | |
1313 | push [edx + TCP_header.SequenceNumber] |
||
1314 | pop [ebx + TCP_SOCKET.IRS] |
||
1315 | |||
1316 | TCP_rcvseqinit ebx |
||
1317 | |||
1318 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1319 | |||
1320 | mov eax, [ebx + TCP_SOCKET.SND_UNA] |
||
1321 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
1322 | jbe .simultaneous_open |
||
1323 | |||
1324 | test [edx + TCP_header.Flags], TH_ACK |
||
1325 | jz .simultaneous_open |
||
1326 | |||
3556 | hidnplayr | 1327 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: active open\n" |
3545 | hidnplayr | 1328 | |
1329 | ;;; TODO: update stats |
||
1330 | |||
1331 | ; set socket state to connected |
||
3674 | hidnplayr | 1332 | push eax |
1333 | mov eax, ebx |
||
1334 | call SOCKET_is_connected |
||
1335 | pop eax |
||
3545 | hidnplayr | 1336 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
1337 | |||
1338 | ; Do window scaling on this connection ? |
||
1339 | mov eax, [ebx + TCP_SOCKET.t_flags] |
||
1340 | and eax, TF_REQ_SCALE or TF_RCVD_SCALE |
||
1341 | cmp eax, TF_REQ_SCALE or TF_RCVD_SCALE |
||
1342 | jne .no_scaling |
||
1343 | |||
1344 | mov ax, word [ebx + TCP_SOCKET.requested_s_scale] |
||
1345 | mov word [ebx + TCP_SOCKET.SND_SCALE], ax |
||
1346 | .no_scaling: |
||
1347 | |||
1348 | ;;; TODO: reassemble packets queue |
||
1349 | |||
1350 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
||
1351 | test eax, eax |
||
5133 | hidnplayr | 1352 | je .trim |
3545 | hidnplayr | 1353 | call TCP_xmit_timer |
5133 | hidnplayr | 1354 | jmp .trim |
3545 | hidnplayr | 1355 | |
1356 | .simultaneous_open: |
||
1357 | |||
3556 | hidnplayr | 1358 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: simultaneous open\n" |
3545 | hidnplayr | 1359 | ; We have received a syn but no ACK, so we are having a simultaneous open.. |
1360 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
||
1361 | |||
1362 | ;------------------------------------- |
||
1363 | ; Common processing for receipt of SYN |
||
1364 | |||
5133 | hidnplayr | 1365 | .trim: |
3545 | hidnplayr | 1366 | inc [edx + TCP_header.SequenceNumber] |
1367 | |||
4339 | hidnplayr | 1368 | ; Drop any received data that doesnt fit in the receive window. |
1369 | cmp ecx, [ebx + TCP_SOCKET.RCV_WND] |
||
1370 | jbe .dont_trim |
||
3545 | hidnplayr | 1371 | |
4339 | hidnplayr | 1372 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: received data does not fit in window, trimming %u bytes\n", eax |
1373 | mov ecx, [ebx + TCP_SOCKET.RCV_WND] |
||
1374 | and [edx + TCP_header.Flags], not (TH_FIN) |
||
1375 | ;;; TODO: update stats |
||
1376 | |||
1377 | .dont_trim: |
||
3545 | hidnplayr | 1378 | mov eax, [edx + TCP_header.SequenceNumber] |
1379 | mov [ebx + TCP_SOCKET.RCV_UP], eax |
||
1380 | dec eax |
||
1381 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
1382 | |||
1383 | .ack_processed: |
||
3556 | hidnplayr | 1384 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: ACK processed\n" |
3545 | hidnplayr | 1385 | |
1386 | ;---------------------------------------------- |
||
1387 | ; check if we need to update window information |
||
1388 | |||
1389 | test [edx + TCP_header.Flags], TH_ACK |
||
1390 | jz .no_window_update |
||
1391 | |||
1392 | mov eax, [ebx + TCP_SOCKET.SND_WL1] |
||
1393 | cmp eax, [edx + TCP_header.SequenceNumber] |
||
1394 | jb .update_window |
||
1395 | ja @f |
||
1396 | |||
1397 | mov eax, [ebx + TCP_SOCKET.SND_WL2] |
||
1398 | cmp eax, [edx + TCP_header.AckNumber] |
||
1399 | jb .update_window |
||
1400 | ja .no_window_update |
||
1401 | @@: |
||
1402 | |||
1403 | mov eax, dword [edx + TCP_header.Window] |
||
1404 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
1405 | jbe .no_window_update |
||
1406 | |||
1407 | .update_window: |
||
1408 | |||
1409 | ;;; TODO: update stats (Keep track of pure window updates) |
||
1410 | |||
1411 | mov eax, dword [edx + TCP_header.Window] |
||
1412 | cmp eax, [ebx + TCP_SOCKET.max_sndwnd] |
||
1413 | jbe @f |
||
1414 | mov [ebx + TCP_SOCKET.max_sndwnd], eax |
||
1415 | @@: |
||
1416 | mov [ebx + TCP_SOCKET.SND_WND], eax |
||
1417 | |||
3556 | hidnplayr | 1418 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Updating window to %u\n", eax |
3545 | hidnplayr | 1419 | |
1420 | push [edx + TCP_header.SequenceNumber] |
||
1421 | pop [ebx + TCP_SOCKET.SND_WL1] |
||
1422 | |||
1423 | push [edx + TCP_header.AckNumber] |
||
1424 | pop [ebx + TCP_SOCKET.SND_WL2] |
||
1425 | |||
4347 | hidnplayr | 1426 | or [temp_bits], TCP_BIT_NEEDOUTPUT |
3545 | hidnplayr | 1427 | |
1428 | .no_window_update: |
||
1429 | |||
1430 | ;----------------- |
||
1431 | ; process URG flag |
||
1432 | |||
1433 | test [edx + TCP_header.Flags], TH_URG |
||
1434 | jz .not_urgent |
||
1435 | |||
1436 | cmp [edx + TCP_header.UrgentPointer], 0 |
||
1437 | jz .not_urgent |
||
1438 | |||
1439 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
1440 | je .not_urgent |
||
1441 | |||
1442 | ; Ignore bogus urgent offsets |
||
1443 | |||
1444 | movzx eax, [edx + TCP_header.UrgentPointer] |
||
1445 | add eax, [ebx + STREAM_SOCKET.rcv.size] |
||
1446 | cmp eax, SOCKET_MAXDATA |
||
1447 | jbe .not_urgent |
||
1448 | |||
1449 | mov [edx + TCP_header.UrgentPointer], 0 |
||
1450 | and [edx + TCP_header.Flags], not (TH_URG) |
||
1451 | jmp .do_data |
||
1452 | |||
1453 | .not_urgent: |
||
1454 | |||
1455 | ; processing of received urgent pointer |
||
1456 | |||
1457 | ;;; TODO (1051-1093) |
||
1458 | |||
1459 | |||
1460 | ;--------------------------------------- |
||
1461 | ; process the data in the segment (1094) |
||
1462 | |||
1463 | .do_data: |
||
1464 | |||
1465 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
1466 | jae .final_processing |
||
1467 | |||
1468 | test [edx + TCP_header.Flags], TH_FIN |
||
1469 | jnz @f |
||
1470 | |||
1471 | test ecx, ecx |
||
3756 | hidnplayr | 1472 | jz .final_processing |
3545 | hidnplayr | 1473 | @@: |
1474 | |||
1475 | ; The segment is in order? |
||
1476 | mov eax, [edx + TCP_header.SequenceNumber] |
||
1477 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
1478 | jne .out_of_order |
||
1479 | |||
1480 | ; The reassembly queue is empty? |
||
1481 | cmp [ebx + TCP_SOCKET.seg_next], 0 |
||
1482 | jne .out_of_order |
||
1483 | |||
1484 | ; The connection is established? |
||
1485 | cmp [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
||
1486 | jne .out_of_order |
||
1487 | |||
1488 | ; Ok, lets do this.. Set delayed ACK flag and copy data into socket buffer |
||
1489 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK |
||
1490 | |||
1491 | pusha |
||
4339 | hidnplayr | 1492 | mov esi, [dataoffset] |
3545 | hidnplayr | 1493 | add esi, edx |
1494 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
1495 | call SOCKET_ring_write ; Add the data to the socket buffer |
||
1496 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
||
1497 | popa |
||
1498 | |||
1499 | ; Wake up the sleeping process |
||
1500 | mov eax, ebx |
||
1501 | call SOCKET_notify |
||
1502 | |||
1503 | jmp .data_done |
||
1504 | |||
1505 | .out_of_order: |
||
4339 | hidnplayr | 1506 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP data is out of order!\nSequencenumber is %u, we expected %u.\n", \ |
1507 | [edx + TCP_header.SequenceNumber], [ebx + TCP_SOCKET.RCV_NXT] |
||
3545 | hidnplayr | 1508 | |
1509 | ; Uh-oh, some data is out of order, lets call TCP reassemble for help |
||
1510 | |||
1511 | call TCP_reassemble |
||
1512 | |||
4339 | hidnplayr | 1513 | ; Generate ACK immediately, to let the other end know that a segment was received out of order, |
1514 | ; and to tell it what sequence number is expected. This aids the fast-retransmit algorithm. |
||
3545 | hidnplayr | 1515 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1516 | .data_done: |
||
1517 | |||
1518 | ;--------------- |
||
1519 | ; FIN processing |
||
1520 | |||
1521 | test [edx + TCP_header.Flags], TH_FIN |
||
1522 | jz .final_processing |
||
1523 | |||
3556 | hidnplayr | 1524 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Processing FIN\n" |
3545 | hidnplayr | 1525 | |
1526 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
1527 | jae .not_first_fin |
||
1528 | |||
3556 | hidnplayr | 1529 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: First FIN for this connection\n" |
3545 | hidnplayr | 1530 | |
1531 | mov eax, ebx |
||
1532 | call SOCKET_cant_recv_more |
||
1533 | |||
4347 | hidnplayr | 1534 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
3545 | hidnplayr | 1535 | inc [ebx + TCP_SOCKET.RCV_NXT] |
1536 | |||
1537 | .not_first_fin: |
||
1538 | mov eax, [ebx + TCP_SOCKET.t_state] |
||
1539 | shl eax, 2 |
||
1540 | jmp dword [eax + .FIN_sw_list] |
||
1541 | |||
1542 | .FIN_sw_list: |
||
1543 | dd .final_processing ; TCPS_CLOSED |
||
1544 | dd .final_processing ; TCPS_LISTEN |
||
1545 | dd .final_processing ; TCPS_SYN_SENT |
||
1546 | dd .fin_syn_est ; TCPS_SYN_RECEIVED |
||
1547 | dd .fin_syn_est ; TCPS_ESTABLISHED |
||
1548 | dd .final_processing ; TCPS_CLOSE_WAIT |
||
1549 | dd .fin_wait1 ; TCPS_FIN_WAIT_1 |
||
1550 | dd .final_processing ; TCPS_CLOSING |
||
1551 | dd .final_processing ; TCPS_LAST_ACK |
||
1552 | dd .fin_wait2 ; TCPS_FIN_WAIT_2 |
||
1553 | dd .fin_timed ; TCPS_TIMED_WAIT |
||
1554 | |||
1555 | .fin_syn_est: |
||
1556 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
||
1557 | jmp .final_processing |
||
1558 | |||
1559 | .fin_wait1: |
||
1560 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSING |
||
1561 | jmp .final_processing |
||
1562 | |||
1563 | .fin_wait2: |
||
1564 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
1565 | mov eax, ebx |
||
1566 | call TCP_cancel_timers |
||
1567 | call SOCKET_is_disconnected |
||
1568 | |||
1569 | .fin_timed: |
||
1570 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
3600 | hidnplayr | 1571 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
3545 | hidnplayr | 1572 | |
4347 | hidnplayr | 1573 | ;----------------- |
1574 | ; Final processing |
||
3545 | hidnplayr | 1575 | |
4347 | hidnplayr | 1576 | .final_processing: |
1577 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Final processing\n" |
||
1578 | |||
1579 | push ebx |
||
1580 | lea ecx, [ebx + SOCKET.mutex] |
||
1581 | call mutex_unlock |
||
1582 | pop eax |
||
1583 | |||
1584 | test [temp_bits], TCP_BIT_NEEDOUTPUT |
||
1585 | jnz .need_output |
||
1586 | |||
1587 | test [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
||
5133 | hidnplayr | 1588 | jz .done |
4347 | hidnplayr | 1589 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: ACK now!\n" |
1590 | |||
1591 | .need_output: |
||
1592 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: need output\n" |
||
1593 | call TCP_output |
||
1594 | |||
5133 | hidnplayr | 1595 | .done: |
4347 | hidnplayr | 1596 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: dumping\n" |
1597 | |||
1598 | call NET_packet_free |
||
1599 | jmp .loop |
||
1600 | |||
1601 | |||
1602 | ;----------------- |
||
1603 | ; Drop the segment |
||
1604 | |||
1605 | |||
3545 | hidnplayr | 1606 | .drop_after_ack: |
3556 | hidnplayr | 1607 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Drop after ACK\n" |
3545 | hidnplayr | 1608 | |
1609 | push edx ebx |
||
1610 | lea ecx, [ebx + SOCKET.mutex] |
||
1611 | call mutex_unlock |
||
1612 | pop eax edx |
||
1613 | |||
1614 | test [edx + TCP_header.Flags], TH_RST |
||
5133 | hidnplayr | 1615 | jnz .done |
3545 | hidnplayr | 1616 | |
1617 | or [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1618 | jmp .need_output |
||
1619 | |||
1620 | .drop_with_reset: |
||
3556 | hidnplayr | 1621 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Drop with reset\n" |
3545 | hidnplayr | 1622 | |
1623 | push ebx edx |
||
1624 | lea ecx, [ebx + SOCKET.mutex] |
||
1625 | call mutex_unlock |
||
1626 | pop edx ebx |
||
1627 | |||
1628 | test [edx + TCP_header.Flags], TH_RST |
||
5133 | hidnplayr | 1629 | jnz .done |
3545 | hidnplayr | 1630 | |
1631 | ;;; if its a multicast/broadcast, also drop |
||
1632 | |||
1633 | test [edx + TCP_header.Flags], TH_ACK |
||
1634 | jnz .respond_ack |
||
1635 | |||
1636 | test [edx + TCP_header.Flags], TH_SYN |
||
1637 | jnz .respond_syn |
||
5133 | hidnplayr | 1638 | jmp .done |
3545 | hidnplayr | 1639 | |
1640 | ;--------- |
||
1641 | ; Respond |
||
1642 | |||
1643 | .respond_ack: |
||
1644 | push ebx |
||
1645 | mov cl, TH_RST |
||
1646 | call TCP_respond |
||
1647 | pop ebx |
||
1648 | jmp .destroy_new_socket |
||
1649 | |||
1650 | .respond_syn: |
||
1651 | push ebx |
||
1652 | mov cl, TH_RST + TH_ACK |
||
1653 | call TCP_respond |
||
1654 | pop ebx |
||
1655 | jmp .destroy_new_socket |
||
1656 | |||
5133 | hidnplayr | 1657 | ;----------------------------------------- |
1658 | ; The connection has no associated socket |
||
1659 | |||
3647 | hidnplayr | 1660 | .no_socket: |
1661 | pusha |
||
1662 | mov ecx, socket_mutex |
||
1663 | call mutex_unlock |
||
1664 | popa |
||
1665 | |||
3545 | hidnplayr | 1666 | .respond_seg_reset: |
1667 | test [edx + TCP_header.Flags], TH_RST |
||
1668 | jnz .drop_no_socket |
||
1669 | |||
1670 | ;;; TODO: if its a multicast/broadcast, also drop |
||
1671 | |||
1672 | test [edx + TCP_header.Flags], TH_ACK |
||
1673 | jnz .respond_seg_ack |
||
1674 | |||
1675 | test [edx + TCP_header.Flags], TH_SYN |
||
1676 | jnz .respond_seg_syn |
||
1677 | |||
1678 | jmp .drop_no_socket |
||
1679 | |||
1680 | .respond_seg_ack: |
||
1681 | mov cl, TH_RST |
||
1682 | call TCP_respond_segment |
||
1683 | jmp .drop_no_socket |
||
1684 | |||
1685 | .respond_seg_syn: |
||
1686 | mov cl, TH_RST + TH_ACK |
||
1687 | call TCP_respond_segment |
||
1688 | jmp .drop_no_socket |
||
1689 | |||
5133 | hidnplayr | 1690 | ;------------------------------------------------ |
1691 | ; Unlock socket mutex and prepare to drop segment |
||
3545 | hidnplayr | 1692 | |
1693 | .drop: |
||
3556 | hidnplayr | 1694 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Dropping segment\n" |
3545 | hidnplayr | 1695 | |
1696 | pusha |
||
1697 | lea ecx, [ebx + SOCKET.mutex] |
||
1698 | call mutex_unlock |
||
1699 | popa |
||
1700 | |||
5133 | hidnplayr | 1701 | ;-------------------------------------------- |
1702 | ; Destroy the newly created socket if needed |
||
1703 | |||
3545 | hidnplayr | 1704 | .destroy_new_socket: |
4347 | hidnplayr | 1705 | test [temp_bits], TCP_BIT_DROPSOCKET |
3545 | hidnplayr | 1706 | jz .drop_no_socket |
1707 | |||
1708 | mov eax, ebx |
||
1709 | call SOCKET_free |
||
1710 | |||
5133 | hidnplayr | 1711 | ;------------------ |
1712 | ; Drop the segment |
||
1713 | |||
3545 | hidnplayr | 1714 | .drop_no_socket: |
3556 | hidnplayr | 1715 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Drop (no socket)\n" |
3545 | hidnplayr | 1716 | |
3861 | hidnplayr | 1717 | call NET_packet_free |
3545 | hidnplayr | 1718 | jmp .loop |
4339 | hidnplayr | 1719 | |
1720 | endp |