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Rev | Author | Line No. | Line |
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3545 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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7974 | hidnplayr | 3 | ;; Copyright (C) KolibriOS team 2004-2020. 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: 7974 $ |
3545 | hidnplayr | 18 | |
6476 | hidnplayr | 19 | TCP_BIT_NEEDOUTPUT = 1 shl 0 |
20 | TCP_BIT_TIMESTAMP = 1 shl 1 |
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21 | TCP_BIT_DROPSOCKET = 1 shl 2 |
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22 | TCP_BIT_FIN_IS_ACKED = 1 shl 3 |
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23 | |||
5976 | hidnplayr | 24 | ;-----------------------------------------------------------------; |
25 | ; ; |
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26 | ; TCP_input: Add a segment to the incoming TCP queue. ; |
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27 | ; ; |
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28 | ; IN: [esp] = ptr to buffer ; |
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29 | ; ebx = ptr to device struct ; |
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30 | ; ecx = TCP segment size ; |
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31 | ; edx = ptr to IPv4 header ; |
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32 | ; esi = ptr to TCP segment ; |
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33 | ; edi = interface number*4 ; |
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34 | ; ; |
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35 | ; OUT: / ; |
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36 | ; ; |
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37 | ;-----------------------------------------------------------------; |
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3545 | hidnplayr | 38 | align 4 |
6011 | hidnplayr | 39 | tcp_input: |
6908 | ashmew2 | 40 | |
3545 | hidnplayr | 41 | ; record the current time |
5522 | hidnplayr | 42 | push [timer_ticks] ; in 1/100 seconds |
5842 | hidnplayr | 43 | push ebx ecx esi edx ; mind the order (see TCP_queue_entry struct) |
3545 | hidnplayr | 44 | mov esi, esp |
45 | |||
5842 | hidnplayr | 46 | push edi |
3545 | hidnplayr | 47 | add_to_queue TCP_queue, TCP_QUEUE_SIZE, sizeof.TCP_queue_entry, .fail |
5842 | hidnplayr | 48 | pop edi |
3545 | hidnplayr | 49 | add esp, sizeof.TCP_queue_entry |
50 | |||
3644 | hidnplayr | 51 | inc [TCP_segments_rx + edi] |
52 | |||
3545 | hidnplayr | 53 | xor edx, edx |
54 | mov eax, [TCP_input_event] |
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55 | mov ebx, [eax + EVENT.id] |
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56 | xor esi, esi |
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57 | call raise_event |
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58 | |||
59 | ret |
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60 | |||
61 | .fail: |
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5842 | hidnplayr | 62 | pop edi |
3556 | hidnplayr | 63 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP incoming queue is full, discarding packet!\n" |
3545 | hidnplayr | 64 | |
6011 | hidnplayr | 65 | call net_ptr_to_num4 |
3644 | hidnplayr | 66 | inc [TCP_segments_missed + edi] |
3545 | hidnplayr | 67 | |
5841 | hidnplayr | 68 | add esp, sizeof.TCP_queue_entry - 4 |
6011 | hidnplayr | 69 | call net_buff_free |
3545 | hidnplayr | 70 | ret |
71 | |||
72 | |||
6476 | hidnplayr | 73 | ;-----------------------------------------------------------------; |
74 | ; ; |
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75 | ; TCP_process_input: Process segments from the incoming TCP queue.; |
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76 | ; ; |
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77 | ; IN: / ; |
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78 | ; OUT: / ; |
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79 | ; ; |
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80 | ;-----------------------------------------------------------------; |
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3545 | hidnplayr | 81 | align 4 |
6011 | hidnplayr | 82 | proc tcp_process_input |
3545 | hidnplayr | 83 | |
4339 | hidnplayr | 84 | locals |
85 | dataoffset dd ? |
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4344 | hidnplayr | 86 | timestamp dd ? |
4347 | hidnplayr | 87 | temp_bits db ? |
6910 | hidnplayr | 88 | device dd ? |
4339 | hidnplayr | 89 | endl |
90 | |||
3545 | hidnplayr | 91 | xor esi, esi |
92 | mov ecx, MANUAL_DESTROY |
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93 | call create_event |
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94 | mov [TCP_input_event], eax |
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95 | |||
96 | .wait: |
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97 | mov eax, [TCP_input_event] |
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98 | mov ebx, [eax + EVENT.id] |
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99 | call wait_event |
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100 | |||
101 | .loop: |
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102 | get_from_queue TCP_queue, TCP_QUEUE_SIZE, sizeof.TCP_queue_entry, .wait |
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103 | |||
104 | push [esi + TCP_queue_entry.timestamp] |
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4344 | hidnplayr | 105 | pop [timestamp] |
3545 | hidnplayr | 106 | push [esi + TCP_queue_entry.buffer_ptr] |
107 | |||
108 | mov ebx, [esi + TCP_queue_entry.device_ptr] |
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6910 | hidnplayr | 109 | mov [device], ebx |
3545 | hidnplayr | 110 | mov ecx, [esi + TCP_queue_entry.segment_size] |
6910 | hidnplayr | 111 | mov edi, [esi + TCP_queue_entry.ip_ptr] ; ptr to ipv4 header |
3545 | hidnplayr | 112 | mov esi, [esi + TCP_queue_entry.segment_ptr] ; change esi last |
113 | |||
6908 | ashmew2 | 114 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: size=%u time=%d\n", ecx, [timer_ticks] |
3545 | hidnplayr | 115 | |
116 | mov edx, esi |
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117 | |||
6476 | hidnplayr | 118 | ; Verify the checksum (if not already done by hw) |
3545 | hidnplayr | 119 | |
4388 | hidnplayr | 120 | test [ebx + NET_DEVICE.hwacc], NET_HWACC_TCP_IPv4_IN |
121 | jnz .checksum_ok |
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3545 | hidnplayr | 122 | |
123 | push ecx esi |
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124 | pushw [esi + TCP_header.Checksum] |
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125 | mov [esi + TCP_header.Checksum], 0 |
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6011 | hidnplayr | 126 | tcp_checksum (edi+IPv4_header.SourceAddress), (edi+IPv4_header.DestinationAddress) |
5842 | hidnplayr | 127 | pop cx ; previous checksum |
3545 | hidnplayr | 128 | cmp cx, dx |
129 | pop edx ecx |
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130 | jne .drop_no_socket |
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131 | .checksum_ok: |
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132 | |||
133 | ; Verify the data offset |
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6476 | hidnplayr | 134 | |
4339 | hidnplayr | 135 | movzx eax, [edx + TCP_header.DataOffset] |
136 | and al, 0xf0 ; Calculate TCP segment header size (throwing away unused reserved bits in TCP header) |
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137 | shr al, 2 |
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138 | cmp al, sizeof.TCP_header ; Now see if it's at least the size of a standard TCP header |
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139 | jb .drop_no_socket ; If not, drop the packet |
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140 | mov [dataoffset], eax |
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3545 | hidnplayr | 141 | |
142 | sub ecx, eax ; substract TCP header size from total segment size |
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143 | jb .drop_no_socket ; If total segment size is less then the advertised header size, drop packet |
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6908 | ashmew2 | 144 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: %u bytes of data\n", ecx |
3545 | hidnplayr | 145 | |
146 | ;------------------------------------------- |
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147 | ; Convert Big-endian values to little endian |
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148 | |||
149 | ntohd [edx + TCP_header.SequenceNumber] |
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150 | ntohd [edx + TCP_header.AckNumber] |
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151 | |||
152 | ntohw [edx + TCP_header.Window] |
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153 | ntohw [edx + TCP_header.UrgentPointer] |
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154 | |||
6476 | hidnplayr | 155 | ;----------------------------------------------------------------------------------- |
156 | ; |
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3545 | hidnplayr | 157 | ; Find the socket pointer |
6476 | hidnplayr | 158 | ; |
159 | ;----------------------------------------------------------------------------------- |
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3545 | hidnplayr | 160 | |
161 | ; IP Packet TCP Destination Port = local Port |
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162 | ; (IP Packet SenderAddress = Remote IP) OR (Remote IP = 0) |
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163 | ; (IP Packet TCP Source Port = remote Port) OR (remote Port = 0) |
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164 | |||
165 | .findpcb: |
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3647 | hidnplayr | 166 | pusha |
167 | mov ecx, socket_mutex |
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168 | call mutex_lock |
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169 | popa |
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170 | |||
3545 | hidnplayr | 171 | mov ebx, net_sockets |
172 | mov si, [edx + TCP_header.DestinationPort] |
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173 | |||
174 | .socket_loop: |
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175 | mov ebx, [ebx + SOCKET.NextPtr] |
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176 | or ebx, ebx |
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3647 | hidnplayr | 177 | jz .no_socket ;respond_seg_reset |
3545 | hidnplayr | 178 | |
179 | cmp [ebx + SOCKET.Domain], AF_INET4 |
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180 | jne .socket_loop |
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181 | |||
182 | cmp [ebx + SOCKET.Protocol], IP_PROTO_TCP |
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183 | jne .socket_loop |
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184 | |||
185 | cmp [ebx + TCP_SOCKET.LocalPort], si |
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186 | jne .socket_loop |
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187 | |||
188 | mov eax, [ebx + IP_SOCKET.RemoteIP] |
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5842 | hidnplayr | 189 | cmp eax, [edi + IPv4_header.SourceAddress] |
3545 | hidnplayr | 190 | je @f |
191 | test eax, eax |
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192 | jnz .socket_loop |
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193 | @@: |
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194 | |||
195 | mov ax, [ebx + TCP_SOCKET.RemotePort] |
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196 | cmp [edx + TCP_header.SourcePort], ax |
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197 | je .found_socket |
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198 | test ax, ax |
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199 | jnz .socket_loop |
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200 | .found_socket: ; ebx now contains the socketpointer |
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3647 | hidnplayr | 201 | pusha |
202 | mov ecx, socket_mutex |
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203 | call mutex_unlock |
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204 | popa |
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205 | |||
6908 | ashmew2 | 206 | 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 | 207 | |
208 | ;---------------------------- |
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209 | ; Check if socket isnt closed |
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210 | |||
211 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
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212 | je .drop_no_socket |
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213 | |||
214 | ;---------------- |
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215 | ; Lock the socket |
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216 | |||
217 | pusha |
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218 | lea ecx, [ebx + SOCKET.mutex] |
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219 | call mutex_lock |
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220 | popa |
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221 | |||
6908 | ashmew2 | 222 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: socket locked\n" |
3545 | hidnplayr | 223 | |
224 | ;--------------------------- |
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225 | ; disable all temporary bits |
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226 | |||
4347 | hidnplayr | 227 | mov [temp_bits], 0 |
3545 | hidnplayr | 228 | |
229 | ;--------------------------------------- |
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230 | ; unscale the window into a 32 bit value |
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231 | |||
232 | movzx eax, [edx + TCP_header.Window] |
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233 | push ecx |
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234 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
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235 | shl eax, cl |
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6476 | hidnplayr | 236 | mov dword[edx + TCP_header.Window], eax ; word after window is checksum, we dont need checksum anymore |
3545 | hidnplayr | 237 | pop ecx |
238 | |||
6476 | hidnplayr | 239 | ;----------------------------------------------------------------------------------- |
240 | ; |
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241 | ; Accept incoming connections |
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242 | ; |
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243 | ;----------------------------------------------------------------------------------- |
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3545 | hidnplayr | 244 | |
245 | test [ebx + SOCKET.options], SO_ACCEPTCON |
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246 | jz .no_accept |
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247 | |||
6908 | ashmew2 | 248 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Accepting new connection\n" |
3545 | hidnplayr | 249 | |
6476 | hidnplayr | 250 | ; Unlock current socket |
251 | |||
3545 | hidnplayr | 252 | pusha |
253 | lea ecx, [ebx + SOCKET.mutex] |
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254 | call mutex_unlock |
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255 | popa |
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256 | |||
6476 | hidnplayr | 257 | ; Fork it |
258 | |||
5842 | hidnplayr | 259 | push ecx edx esi edi |
6011 | hidnplayr | 260 | call socket_fork |
3545 | hidnplayr | 261 | pop edi esi edx ecx |
262 | |||
263 | test eax, eax |
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264 | jz .drop_no_socket |
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265 | |||
6476 | hidnplayr | 266 | ; Success! Use the new socket from now on (it is already locked) |
267 | |||
3545 | hidnplayr | 268 | mov ebx, eax |
269 | |||
4347 | hidnplayr | 270 | mov [temp_bits], TCP_BIT_DROPSOCKET |
3545 | hidnplayr | 271 | |
5842 | hidnplayr | 272 | push [edi + IPv4_header.DestinationAddress] |
3545 | hidnplayr | 273 | pop [ebx + IP_SOCKET.LocalIP] |
274 | |||
275 | push [edx + TCP_header.DestinationPort] |
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276 | pop [ebx + TCP_SOCKET.LocalPort] |
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277 | |||
278 | mov [ebx + TCP_SOCKET.t_state], TCPS_LISTEN |
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279 | .no_accept: |
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280 | |||
281 | |||
282 | ;------------------------------------- |
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283 | ; Reset idle timer and keepalive timer |
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284 | |||
285 | mov [ebx + TCP_SOCKET.t_idle], 0 |
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286 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_idle |
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3600 | hidnplayr | 287 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_keepalive |
3545 | hidnplayr | 288 | |
6476 | hidnplayr | 289 | ;----------------------------------------------------------------------------------- |
290 | ; |
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3545 | hidnplayr | 291 | ; Process TCP options |
6476 | hidnplayr | 292 | ; |
293 | ;----------------------------------------------------------------------------------- |
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3545 | hidnplayr | 294 | |
4339 | hidnplayr | 295 | ;;; FIXME: for LISTEN, options should be called after we determined route, we need it for MSS |
296 | ;;; cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN ; no options when in listen state |
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297 | ;;; jz .not_uni_xfer ; also no header prediction |
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298 | |||
3545 | hidnplayr | 299 | push ecx |
300 | |||
4339 | hidnplayr | 301 | mov ecx, [dataoffset] |
6476 | hidnplayr | 302 | cmp ecx, sizeof.TCP_header ; Does header contain any options? |
3545 | hidnplayr | 303 | je .no_options |
304 | |||
6908 | ashmew2 | 305 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Segment has options\n" |
3545 | hidnplayr | 306 | |
307 | add ecx, edx |
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308 | lea esi, [edx + sizeof.TCP_header] |
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309 | |||
310 | .opt_loop: |
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311 | cmp esi, ecx ; are we scanning outside of header? |
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312 | jae .no_options |
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313 | lodsb |
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314 | cmp al, TCP_OPT_EOL ; end of option list? |
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315 | je .no_options |
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316 | cmp al, TCP_OPT_NOP |
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317 | je .opt_loop |
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318 | cmp al, TCP_OPT_MAXSEG |
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319 | je .opt_maxseg |
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320 | cmp al, TCP_OPT_WINDOW |
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321 | je .opt_window |
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322 | cmp al, TCP_OPT_SACK_PERMIT |
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323 | je .opt_sack_permit |
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324 | ; cmp al, TCP_OPT_SACK |
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325 | ; je .opt_sack |
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326 | cmp al, TCP_OPT_TIMESTAMP |
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327 | je .opt_timestamp |
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6908 | ashmew2 | 328 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: unknown option:%u\n", al |
3545 | hidnplayr | 329 | jmp .no_options ; If we reach here, some unknown options were received, skip them all! |
330 | |||
331 | .opt_maxseg: |
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332 | lodsb |
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333 | cmp al, 4 |
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334 | jne .no_options ; error occured, ignore all options! |
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335 | |||
336 | test [edx + TCP_header.Flags], TH_SYN |
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337 | jz @f |
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338 | |||
4339 | hidnplayr | 339 | xor eax, eax |
3545 | hidnplayr | 340 | lodsw |
341 | rol ax, 8 |
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6908 | ashmew2 | 342 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Maxseg=%u\n", eax |
6011 | hidnplayr | 343 | call tcp_mss |
3545 | hidnplayr | 344 | @@: |
345 | jmp .opt_loop |
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346 | |||
347 | |||
348 | .opt_window: |
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349 | lodsb |
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350 | cmp al, 3 |
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351 | jne .no_options |
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352 | |||
353 | test [edx + TCP_header.Flags], TH_SYN |
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354 | jz @f |
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355 | |||
6908 | ashmew2 | 356 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Got window scale option\n" |
3545 | hidnplayr | 357 | or [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
358 | |||
359 | lodsb |
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360 | mov [ebx + TCP_SOCKET.SND_SCALE], al |
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361 | ;;;;; TODO |
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362 | |||
363 | @@: |
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364 | jmp .opt_loop |
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365 | |||
366 | |||
367 | .opt_sack_permit: |
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368 | lodsb |
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369 | cmp al, 2 |
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370 | jne .no_options |
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371 | |||
372 | test [edx + TCP_header.Flags], TH_SYN |
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373 | jz @f |
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374 | |||
6908 | ashmew2 | 375 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Selective Acknowledgement permitted\n" |
3545 | hidnplayr | 376 | or [ebx + TCP_SOCKET.t_flags], TF_SACK_PERMIT |
377 | |||
378 | @@: |
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379 | jmp .opt_loop |
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380 | |||
381 | |||
382 | .opt_timestamp: |
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383 | lodsb |
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384 | cmp al, 10 ; length must be 10 |
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385 | jne .no_options |
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386 | |||
6908 | ashmew2 | 387 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Got timestamp option\n" |
3545 | hidnplayr | 388 | |
389 | test [edx + TCP_header.Flags], TH_SYN |
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390 | jz @f |
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391 | or [ebx + TCP_SOCKET.t_flags], TF_RCVD_TSTMP |
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392 | @@: |
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393 | |||
394 | lodsd |
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4344 | hidnplayr | 395 | bswap eax |
3545 | hidnplayr | 396 | mov [ebx + TCP_SOCKET.ts_val], eax |
397 | lodsd ; timestamp echo reply |
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398 | mov [ebx + TCP_SOCKET.ts_ecr], eax |
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4347 | hidnplayr | 399 | or [temp_bits], TCP_BIT_TIMESTAMP |
3545 | hidnplayr | 400 | |
401 | ; Since we have a timestamp, lets do the paws test right away! |
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402 | |||
403 | test [edx + TCP_header.Flags], TH_RST |
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404 | jnz .no_paws |
||
405 | |||
406 | mov eax, [ebx + TCP_SOCKET.ts_recent] |
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407 | test eax, eax |
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408 | jz .no_paws |
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409 | cmp eax, [ebx + TCP_SOCKET.ts_val] |
||
4344 | hidnplayr | 410 | jbe .no_paws |
3545 | hidnplayr | 411 | |
6908 | ashmew2 | 412 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: PAWS: detected an old segment\n" |
3545 | hidnplayr | 413 | |
4344 | hidnplayr | 414 | mov eax, [timestamp] |
3545 | hidnplayr | 415 | sub eax, [ebx + TCP_SOCKET.ts_recent_age] |
416 | |||
417 | pop ecx |
||
418 | cmp eax, TCP_PAWS_IDLE |
||
5442 | hidnplayr | 419 | jle .paws_drop |
3545 | hidnplayr | 420 | push ecx |
421 | mov [ebx + TCP_SOCKET.ts_recent], 0 ; timestamp was invalid, fix it. |
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422 | .no_paws: |
||
423 | jmp .opt_loop |
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424 | |||
5442 | hidnplayr | 425 | .paws_drop: |
6476 | hidnplayr | 426 | inc [TCPS_rcvduppack] |
5442 | hidnplayr | 427 | add [TCPS_rcvdupbyte], ecx |
428 | inc [TCPS_pawsdrop] |
||
429 | jmp .drop_after_ack |
||
430 | |||
3545 | hidnplayr | 431 | .no_options: |
432 | |||
433 | pop ecx |
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434 | |||
6476 | hidnplayr | 435 | ;----------------------------------------------------------------------------------- |
436 | ; |
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437 | ; Header prediction |
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438 | ; |
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439 | ;----------------------------------------------------------------------------------- |
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3545 | hidnplayr | 440 | |
6476 | hidnplayr | 441 | ; According to Van Jacobson, there are two common cases for an uni-directional data transfer. |
3545 | hidnplayr | 442 | ; |
443 | ; General rule: the packets has no control flags, is in-sequence, |
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444 | ; window width didnt change and we're not retransmitting. |
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445 | ; |
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446 | ; Second rules: |
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447 | ; - If the length is 0 and the ACK moved forward, we're the sender side of the transfer. |
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448 | ; 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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449 | ; |
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450 | ; - If the length is not 0 and the ACK didn't move, we're the receiver side of the transfer. |
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451 | ; 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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452 | |||
453 | cmp [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
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454 | jnz .not_uni_xfer |
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455 | |||
456 | test [edx + TCP_header.Flags], TH_SYN + TH_FIN + TH_RST + TH_URG |
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457 | jnz .not_uni_xfer |
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458 | |||
459 | test [edx + TCP_header.Flags], TH_ACK |
||
460 | jz .not_uni_xfer |
||
461 | |||
462 | mov eax, [edx + TCP_header.SequenceNumber] |
||
463 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
464 | jne .not_uni_xfer |
||
465 | |||
6476 | hidnplayr | 466 | mov eax, dword[edx + TCP_header.Window] |
3545 | hidnplayr | 467 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
468 | jne .not_uni_xfer |
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469 | |||
470 | mov eax, [ebx + TCP_SOCKET.SND_NXT] |
||
471 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
472 | jne .not_uni_xfer |
||
473 | |||
474 | ;--------------------------------------- |
||
475 | ; check if we are sender in the uni-xfer |
||
476 | |||
477 | ; If the following 4 conditions are all true, this segment is a pure ACK. |
||
478 | ; |
||
479 | ; - The segment contains no data. |
||
6476 | hidnplayr | 480 | |
3545 | hidnplayr | 481 | test ecx, ecx |
482 | jnz .not_sender |
||
483 | |||
484 | ; - The congestion window is greater than or equal to the current send window. |
||
485 | ; 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. |
||
6476 | hidnplayr | 486 | |
3545 | hidnplayr | 487 | mov eax, [ebx + TCP_SOCKET.SND_CWND] |
488 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
489 | jb .not_uni_xfer |
||
490 | |||
491 | ; - The acknowledgment field in the segment is less than or equal to the maximum sequence number sent. |
||
6476 | hidnplayr | 492 | |
3545 | hidnplayr | 493 | mov eax, [edx + TCP_header.AckNumber] |
494 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
495 | ja .not_uni_xfer |
||
496 | |||
497 | ; - The acknowledgment field in the segment is greater than the largest unacknowledged sequence number. |
||
6476 | hidnplayr | 498 | |
3545 | hidnplayr | 499 | sub eax, [ebx + TCP_SOCKET.SND_UNA] |
500 | jbe .not_uni_xfer |
||
501 | |||
6908 | ashmew2 | 502 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Header prediction: we are sender\n" |
3545 | hidnplayr | 503 | |
504 | ;--------------------------------- |
||
505 | ; Packet is a pure ACK, process it |
||
506 | |||
6476 | hidnplayr | 507 | inc [TCPS_predack] |
508 | |||
509 | inc [TCPS_rcvackpack] |
||
510 | add [TCPS_rcvackbyte], eax |
||
511 | |||
3545 | hidnplayr | 512 | ; Delete acknowledged bytes from send buffer |
6476 | hidnplayr | 513 | |
3545 | hidnplayr | 514 | pusha |
515 | mov ecx, eax |
||
516 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
6011 | hidnplayr | 517 | call socket_ring_free |
3545 | hidnplayr | 518 | popa |
519 | |||
520 | ; Update RTT estimators |
||
521 | |||
4347 | hidnplayr | 522 | test [temp_bits], TCP_BIT_TIMESTAMP |
3545 | hidnplayr | 523 | jz .no_timestamp_rtt |
4344 | hidnplayr | 524 | mov eax, [timestamp] |
3545 | hidnplayr | 525 | sub eax, [ebx + TCP_SOCKET.ts_ecr] |
526 | inc eax |
||
6011 | hidnplayr | 527 | call tcp_xmit_timer |
3545 | hidnplayr | 528 | jmp .rtt_done |
5976 | hidnplayr | 529 | .no_timestamp_rtt: |
3545 | hidnplayr | 530 | |
531 | cmp [ebx + TCP_SOCKET.t_rtt], 0 |
||
532 | je .rtt_done |
||
533 | mov eax, [edx + TCP_header.AckNumber] |
||
534 | cmp eax, [ebx + TCP_SOCKET.t_rtseq] |
||
535 | jbe .rtt_done |
||
536 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
||
6011 | hidnplayr | 537 | call tcp_xmit_timer |
3545 | hidnplayr | 538 | .rtt_done: |
539 | |||
540 | ; update window pointers |
||
6476 | hidnplayr | 541 | |
3545 | hidnplayr | 542 | mov eax, [edx + TCP_header.AckNumber] |
543 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
544 | |||
545 | ; Stop retransmit timer |
||
6476 | hidnplayr | 546 | |
3600 | hidnplayr | 547 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission |
3545 | hidnplayr | 548 | |
549 | ; Unlock the socket |
||
6476 | hidnplayr | 550 | |
3545 | hidnplayr | 551 | pusha |
552 | lea ecx, [ebx + SOCKET.mutex] |
||
553 | call mutex_unlock |
||
554 | popa |
||
555 | |||
556 | ; Awaken waiting processes |
||
6476 | hidnplayr | 557 | |
3545 | hidnplayr | 558 | mov eax, ebx |
6011 | hidnplayr | 559 | call socket_notify |
3545 | hidnplayr | 560 | |
561 | ; Generate more output |
||
6476 | hidnplayr | 562 | |
6011 | hidnplayr | 563 | call tcp_output |
3545 | hidnplayr | 564 | |
565 | jmp .drop_no_socket |
||
566 | |||
567 | ;------------------------------------------------- |
||
568 | ; maybe we are the receiver in the uni-xfer then.. |
||
569 | |||
570 | .not_sender: |
||
6476 | hidnplayr | 571 | |
3545 | hidnplayr | 572 | ; - The amount of data in the segment is greater than 0 (data count is in ecx) |
6476 | hidnplayr | 573 | ; - The acknowledgment field equals the largest unacknowledged sequence number. This means no data is acknowledged by this segment. |
3545 | hidnplayr | 574 | |
575 | mov eax, [edx + TCP_header.AckNumber] |
||
576 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
577 | jne .not_uni_xfer |
||
578 | |||
5133 | hidnplayr | 579 | ; - The reassembly list of out-of-order segments for the connection is empty. |
6476 | hidnplayr | 580 | |
5133 | hidnplayr | 581 | cmp [ebx + TCP_SOCKET.seg_next], 0 |
582 | jne .not_uni_xfer |
||
3545 | hidnplayr | 583 | |
584 | ; Complete processing of received data |
||
585 | |||
6908 | ashmew2 | 586 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Header prediction: we are receiving %u bytes\n", ecx |
3545 | hidnplayr | 587 | |
4339 | hidnplayr | 588 | mov esi, [dataoffset] |
3545 | hidnplayr | 589 | add esi, edx |
590 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
6011 | hidnplayr | 591 | call socket_ring_write ; Add the data to the socket buffer |
4344 | hidnplayr | 592 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
3545 | hidnplayr | 593 | |
594 | mov eax, ebx |
||
6011 | hidnplayr | 595 | call socket_notify |
3545 | hidnplayr | 596 | |
597 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK ; Set delayed ack flag |
||
598 | |||
599 | jmp .drop |
||
600 | |||
601 | |||
6476 | hidnplayr | 602 | ;----------------------------------------------------------------------------------- |
603 | ; |
||
604 | ; TCP segment processing, the slow way |
||
605 | ; |
||
606 | ;----------------------------------------------------------------------------------- |
||
607 | |||
3545 | hidnplayr | 608 | .not_uni_xfer: |
6908 | ashmew2 | 609 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Header prediction failed\n" |
3545 | hidnplayr | 610 | |
611 | ; Calculate receive window size |
||
6476 | hidnplayr | 612 | |
3545 | hidnplayr | 613 | push edx |
6413 | hidnplayr | 614 | mov eax, SOCKET_BUFFER_SIZE |
3545 | hidnplayr | 615 | sub eax, [ebx + STREAM_SOCKET.rcv.size] |
6908 | ashmew2 | 616 | DEBUGF DEBUG_NETWORK_VERBOSE, "Space in receive buffer=%d\n", eax |
3545 | hidnplayr | 617 | mov edx, [ebx + TCP_SOCKET.RCV_ADV] |
618 | sub edx, [ebx + TCP_SOCKET.RCV_NXT] |
||
6908 | ashmew2 | 619 | DEBUGF DEBUG_NETWORK_VERBOSE, "Current advertised window=%d\n", edx |
3545 | hidnplayr | 620 | cmp eax, edx |
621 | jg @f |
||
622 | mov eax, edx |
||
623 | @@: |
||
6908 | ashmew2 | 624 | DEBUGF DEBUG_NETWORK_VERBOSE, "Receive window size=%d\n", eax |
3545 | hidnplayr | 625 | mov [ebx + TCP_SOCKET.RCV_WND], eax |
626 | pop edx |
||
627 | |||
628 | ; If we are in listen or syn_sent state, go to that specific code right away |
||
629 | |||
630 | cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN |
||
6476 | hidnplayr | 631 | je .state_listen |
3545 | hidnplayr | 632 | |
633 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_SENT |
||
6476 | hidnplayr | 634 | je .state_syn_sent |
3545 | hidnplayr | 635 | |
6476 | hidnplayr | 636 | ;----------------------------------------------------------------------------------- |
637 | ; |
||
638 | ; Trim any data not in window |
||
639 | ; |
||
640 | ;----------------------------------------------------------------------------------- |
||
3545 | hidnplayr | 641 | |
6476 | hidnplayr | 642 | ;------------------------------------------------- |
643 | ; Check for duplicate data at beginning of segment |
||
3545 | hidnplayr | 644 | |
4339 | hidnplayr | 645 | ; Calculate number of bytes we need to drop |
6476 | hidnplayr | 646 | |
3545 | hidnplayr | 647 | mov eax, [ebx + TCP_SOCKET.RCV_NXT] |
648 | sub eax, [edx + TCP_header.SequenceNumber] |
||
649 | jle .no_duplicate |
||
650 | |||
6908 | ashmew2 | 651 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: %u bytes duplicate data!\n", eax |
3545 | hidnplayr | 652 | |
6476 | hidnplayr | 653 | ; Check for duplicate SYN |
654 | |||
3545 | hidnplayr | 655 | test [edx + TCP_header.Flags], TH_SYN |
656 | jz .no_dup_syn |
||
657 | |||
6908 | ashmew2 | 658 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: got duplicate syn\n" |
3545 | hidnplayr | 659 | |
660 | and [edx + TCP_header.Flags], not (TH_SYN) |
||
661 | inc [edx + TCP_header.SequenceNumber] |
||
662 | |||
663 | cmp [edx + TCP_header.UrgentPointer], 1 |
||
664 | jbe @f |
||
665 | dec [edx + TCP_header.UrgentPointer] |
||
666 | jmp .dup_syn |
||
667 | @@: |
||
668 | and [edx + TCP_header.Flags], not (TH_URG) |
||
669 | .dup_syn: |
||
670 | dec eax |
||
671 | .no_dup_syn: |
||
672 | |||
6476 | hidnplayr | 673 | ;----------------------------------- |
674 | ; Check for entire duplicate segment |
||
675 | |||
3545 | hidnplayr | 676 | cmp eax, ecx ; eax holds number of bytes to drop, ecx is data size |
6476 | hidnplayr | 677 | jb .no_complete_dup |
3545 | hidnplayr | 678 | jnz @f |
679 | test [edx + TCP_header.Flags], TH_FIN |
||
6476 | hidnplayr | 680 | jnz .no_complete_dup |
3545 | hidnplayr | 681 | @@: |
682 | |||
683 | ; Any valid FIN must be to the left of the window. |
||
684 | ; At this point the FIN must be out of sequence or a duplicate, drop it |
||
6476 | hidnplayr | 685 | |
3545 | hidnplayr | 686 | and [edx + TCP_header.Flags], not TH_FIN |
687 | |||
6476 | hidnplayr | 688 | ; send an ACK to resynchronize and drop any data. |
3545 | hidnplayr | 689 | ; But keep on processing for RST or ACK |
6476 | hidnplayr | 690 | |
3545 | hidnplayr | 691 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
692 | mov eax, ecx |
||
693 | |||
6476 | hidnplayr | 694 | inc [TCPS_rcvduppack] |
695 | add [TCPS_rcvdupbyte], eax |
||
696 | jmp .dup_processed |
||
697 | .no_complete_dup: |
||
5442 | hidnplayr | 698 | inc [TCPS_rcvpartduppack] |
6476 | hidnplayr | 699 | add [TCPS_rcvpartdupbyte], eax |
700 | .dup_processed: |
||
5442 | hidnplayr | 701 | |
3545 | hidnplayr | 702 | ;----------------------------------------------- |
703 | ; Remove duplicate data and update urgent offset |
||
704 | |||
6908 | ashmew2 | 705 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: trimming duplicate data\n" |
4339 | hidnplayr | 706 | |
707 | ; Trim data from left side of window |
||
6476 | hidnplayr | 708 | |
4339 | hidnplayr | 709 | add [dataoffset], eax |
3545 | hidnplayr | 710 | add [edx + TCP_header.SequenceNumber], eax |
711 | sub ecx, eax |
||
712 | |||
713 | sub [edx + TCP_header.UrgentPointer], ax |
||
714 | jg @f |
||
715 | and [edx + TCP_header.Flags], not (TH_URG) |
||
716 | mov [edx + TCP_header.UrgentPointer], 0 |
||
717 | @@: |
||
6476 | hidnplayr | 718 | .no_duplicate: |
3545 | hidnplayr | 719 | |
720 | ;-------------------------------------------------- |
||
4339 | hidnplayr | 721 | ; Handle data that arrives after process terminates |
3545 | hidnplayr | 722 | |
4339 | hidnplayr | 723 | cmp [ebx + SOCKET.PID], 0 ;;; TODO: use socket flags instead?? |
3545 | hidnplayr | 724 | jne .not_terminated |
725 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
||
726 | jbe .not_terminated |
||
727 | test ecx, ecx |
||
728 | jz .not_terminated |
||
729 | |||
730 | mov eax, ebx |
||
6011 | hidnplayr | 731 | call tcp_close |
5442 | hidnplayr | 732 | inc [TCPS_rcvafterclose] |
3545 | hidnplayr | 733 | jmp .respond_seg_reset |
6476 | hidnplayr | 734 | .not_terminated: |
3545 | hidnplayr | 735 | |
736 | ;---------------------------------------- |
||
4339 | hidnplayr | 737 | ; Remove data beyond right edge of window |
3545 | hidnplayr | 738 | |
739 | mov eax, [edx + TCP_header.SequenceNumber] |
||
740 | add eax, ecx |
||
741 | sub eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
742 | sub eax, [ebx + TCP_SOCKET.RCV_WND] ; eax now holds the number of bytes to drop |
||
743 | jle .no_excess_data |
||
744 | |||
6908 | ashmew2 | 745 | DEBUGF DEBUG_NETWORK_VERBOSE, "%d bytes beyond right edge of window\n", eax |
3545 | hidnplayr | 746 | |
6476 | hidnplayr | 747 | inc [TCPS_rcvpackafterwin] |
748 | |||
3545 | hidnplayr | 749 | cmp eax, ecx |
750 | jl .dont_drop_all |
||
6476 | hidnplayr | 751 | |
752 | add [TCPS_rcvbyteafterwin], ecx |
||
753 | |||
754 | ;---------------------------------------------------------------------------------------------------- |
||
3545 | hidnplayr | 755 | ; If a new connection request is received while in TIME_WAIT, drop the old connection and start over, |
756 | ; if the sequence numbers are above the previous ones |
||
757 | |||
758 | test [edx + TCP_header.Flags], TH_SYN |
||
759 | jz .no_new_request |
||
6476 | hidnplayr | 760 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIME_WAIT |
3545 | hidnplayr | 761 | jne .no_new_request |
762 | ; mov edx, [ebx + TCP_SOCKET.RCV_NXT] |
||
763 | ; cmp edx, [edx + TCP_header.SequenceNumber] |
||
764 | ; add edx, 64000 ; TCP_ISSINCR FIXME |
||
765 | mov eax, ebx |
||
6011 | hidnplayr | 766 | call tcp_close |
3545 | hidnplayr | 767 | jmp .findpcb ; FIXME: skip code for unscaling window, ... |
768 | .no_new_request: |
||
769 | |||
4339 | hidnplayr | 770 | ; If window is closed, we can only take segments at window edge, and have to drop data and PUSH from |
3545 | hidnplayr | 771 | ; incoming segments. Continue processing, but remember to ACK. Otherwise drop segment and ACK |
772 | |||
773 | cmp [ebx + TCP_SOCKET.RCV_WND], 0 |
||
774 | jne .drop_after_ack |
||
4339 | hidnplayr | 775 | mov esi, [edx + TCP_header.SequenceNumber] |
776 | cmp esi, [ebx + TCP_SOCKET.RCV_NXT] |
||
3545 | hidnplayr | 777 | jne .drop_after_ack |
778 | |||
779 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
6476 | hidnplayr | 780 | inc [TCPS_rcvwinprobe] |
3545 | hidnplayr | 781 | .dont_drop_all: |
6476 | hidnplayr | 782 | add [TCPS_rcvbyteafterwin], eax |
6908 | ashmew2 | 783 | DEBUGF DEBUG_NETWORK_VERBOSE, "Trimming %u bytes from the right of the window\n" |
6476 | hidnplayr | 784 | |
785 | ; remove data from the right side of window (decrease data length) |
||
786 | |||
787 | sub ecx, eax |
||
4347 | hidnplayr | 788 | and [edx + TCP_header.Flags], not (TH_PUSH or TH_FIN) |
3545 | hidnplayr | 789 | .no_excess_data: |
790 | |||
6476 | hidnplayr | 791 | ;----------------------------------------------------------------------------------- |
792 | ; |
||
4339 | hidnplayr | 793 | ; Record timestamp |
6476 | hidnplayr | 794 | ; |
795 | ;----------------------------------------------------------------------------------- |
||
3545 | hidnplayr | 796 | |
797 | ; If last ACK falls within this segments sequence numbers, record its timestamp |
||
6476 | hidnplayr | 798 | |
4347 | hidnplayr | 799 | test [temp_bits], TCP_BIT_TIMESTAMP |
3545 | hidnplayr | 800 | jz .no_timestamp |
801 | mov eax, [ebx + TCP_SOCKET.last_ack_sent] |
||
802 | sub eax, [edx + TCP_header.SequenceNumber] |
||
803 | jb .no_timestamp |
||
6476 | hidnplayr | 804 | test [edx + TCP_header.Flags], TH_SYN or TH_FIN ; SYN and FIN occupy one byte |
3545 | hidnplayr | 805 | jz @f |
806 | dec eax |
||
807 | @@: |
||
808 | sub eax, ecx |
||
809 | jae .no_timestamp |
||
810 | |||
6908 | ashmew2 | 811 | DEBUGF DEBUG_NETWORK_VERBOSE, "Recording timestamp\n" |
3545 | hidnplayr | 812 | |
4344 | hidnplayr | 813 | mov eax, [timestamp] |
3545 | hidnplayr | 814 | mov [ebx + TCP_SOCKET.ts_recent_age], eax |
815 | mov eax, [ebx + TCP_SOCKET.ts_val] |
||
816 | mov [ebx + TCP_SOCKET.ts_recent], eax |
||
817 | .no_timestamp: |
||
818 | |||
6476 | hidnplayr | 819 | ;----------------------------------------------------------------------------------- |
820 | ; |
||
821 | ; Process RST flag |
||
822 | ; |
||
823 | ;----------------------------------------------------------------------------------- |
||
3545 | hidnplayr | 824 | |
825 | test [edx + TCP_header.Flags], TH_RST |
||
826 | jz .no_rst |
||
827 | |||
6908 | ashmew2 | 828 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Got an RST flag\n" |
3545 | hidnplayr | 829 | |
830 | mov eax, [ebx + TCP_SOCKET.t_state] |
||
831 | shl eax, 2 |
||
832 | jmp dword [eax + .rst_sw_list] |
||
833 | |||
6476 | hidnplayr | 834 | ;----------------------------------------------------------------------------------- |
3545 | hidnplayr | 835 | .rst_sw_list: |
836 | dd .no_rst ; TCPS_CLOSED |
||
837 | dd .no_rst ; TCPS_LISTEN |
||
838 | dd .no_rst ; TCPS_SYN_SENT |
||
839 | dd .econnrefused ; TCPS_SYN_RECEIVED |
||
840 | dd .econnreset ; TCPS_ESTABLISHED |
||
841 | dd .econnreset ; TCPS_CLOSE_WAIT |
||
842 | dd .econnreset ; TCPS_FIN_WAIT_1 |
||
843 | dd .rst_close ; TCPS_CLOSING |
||
844 | dd .rst_close ; TCPS_LAST_ACK |
||
845 | dd .econnreset ; TCPS_FIN_WAIT_2 |
||
6476 | hidnplayr | 846 | dd .rst_close ; TCPS_TIME_WAIT |
3545 | hidnplayr | 847 | |
6476 | hidnplayr | 848 | ;----------------------------------------------------------------------------------- |
3545 | hidnplayr | 849 | .econnrefused: |
6908 | ashmew2 | 850 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Connection refused\n" |
3545 | hidnplayr | 851 | mov [ebx + SOCKET.errorcode], ECONNREFUSED |
852 | jmp .close |
||
853 | |||
6476 | hidnplayr | 854 | ;----------------------------------------------------------------------------------- |
3545 | hidnplayr | 855 | .econnreset: |
6908 | ashmew2 | 856 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Connection reset\n" |
3545 | hidnplayr | 857 | mov [ebx + SOCKET.errorcode], ECONNRESET |
858 | .close: |
||
6908 | ashmew2 | 859 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Closing connection\n" |
6476 | hidnplayr | 860 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
861 | inc [TCPS_drops] |
||
3545 | hidnplayr | 862 | |
6476 | hidnplayr | 863 | |
6710 | clevermous | 864 | jmp .drop |
3545 | hidnplayr | 865 | |
6476 | hidnplayr | 866 | ;----------------------------------------------------------------------------------- |
3545 | hidnplayr | 867 | .rst_close: |
6908 | ashmew2 | 868 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Closing with reset\n" |
6710 | clevermous | 869 | jmp .unlock_and_close |
3545 | hidnplayr | 870 | |
6476 | hidnplayr | 871 | ;----------------------------------------------------------------------------------- |
3545 | hidnplayr | 872 | .no_rst: |
873 | |||
6476 | hidnplayr | 874 | ;----------------------------------------------------------------------------------- |
875 | ; |
||
876 | ; Handle SYN-full and ACK-less segments |
||
877 | ; |
||
878 | ;----------------------------------------------------------------------------------- |
||
3545 | hidnplayr | 879 | |
6476 | hidnplayr | 880 | ; If a SYN is in the window, then this is an error so we send an RST and drop the connection |
881 | |||
3545 | hidnplayr | 882 | test [edx + TCP_header.Flags], TH_SYN |
883 | jz .not_syn_full |
||
884 | |||
885 | mov eax, ebx |
||
886 | mov ebx, ECONNRESET |
||
6011 | hidnplayr | 887 | call tcp_drop |
3545 | hidnplayr | 888 | jmp .drop_with_reset |
889 | .not_syn_full: |
||
890 | |||
6476 | hidnplayr | 891 | ; If ACK bit is off, we drop the segment and return |
3545 | hidnplayr | 892 | |
893 | test [edx + TCP_header.Flags], TH_ACK |
||
894 | jz .drop |
||
895 | |||
6476 | hidnplayr | 896 | ;---------------------------------------------------------------------------------- |
897 | ; |
||
898 | ; ACK processing for SYN_RECEIVED state |
||
899 | ; |
||
900 | ;---------------------------------------------------------------------------------- |
||
901 | |||
3545 | hidnplayr | 902 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
903 | jb .ack_processed ; states: closed, listen, syn_sent |
||
904 | ja .no_syn_rcv ; established, fin_wait_1, fin_wait_2, close_wait, closing, last_ack, time_wait |
||
905 | |||
6908 | ashmew2 | 906 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: state=syn_received\n" |
3545 | hidnplayr | 907 | |
908 | mov eax, [edx + TCP_header.AckNumber] |
||
909 | cmp [ebx + TCP_SOCKET.SND_UNA], eax |
||
910 | ja .drop_with_reset |
||
911 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
912 | ja .drop_with_reset |
||
913 | |||
6476 | hidnplayr | 914 | inc [TCPS_connects] |
3545 | hidnplayr | 915 | |
916 | mov eax, ebx |
||
6011 | hidnplayr | 917 | call socket_is_connected |
3545 | hidnplayr | 918 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
919 | |||
920 | ; Do window scaling? |
||
921 | |||
922 | test [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
||
923 | jz @f |
||
924 | test [ebx + TCP_SOCKET.t_flags], TF_REQ_SCALE |
||
925 | jz @f |
||
926 | |||
6476 | hidnplayr | 927 | push word[ebx + TCP_SOCKET.requested_s_scale] ; Set send and receive scale factors to the received values |
928 | pop word[ebx + TCP_SOCKET.SND_SCALE] |
||
3545 | hidnplayr | 929 | @@: |
930 | |||
6011 | hidnplayr | 931 | call tcp_reassemble |
3545 | hidnplayr | 932 | |
933 | mov eax, [edx + TCP_header.SequenceNumber] |
||
934 | dec eax |
||
935 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
936 | .no_syn_rcv: |
||
937 | |||
6476 | hidnplayr | 938 | ;----------------------------------------------------------------------------------- |
939 | ; |
||
940 | ; ACK processing for SYN_RECEIVED state and higher |
||
941 | ; |
||
942 | ;----------------------------------------------------------------------------------- |
||
943 | |||
3545 | hidnplayr | 944 | ;------------------------- |
6476 | hidnplayr | 945 | ; Check for duplicate ACKs |
3545 | hidnplayr | 946 | |
947 | mov eax, [edx + TCP_header.AckNumber] |
||
948 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
6476 | hidnplayr | 949 | ja .dup_ack_complete |
3545 | hidnplayr | 950 | |
951 | test ecx, ecx |
||
952 | jnz .reset_dupacks |
||
953 | |||
6476 | hidnplayr | 954 | mov eax, dword[edx + TCP_header.Window] |
3545 | hidnplayr | 955 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
956 | jne .reset_dupacks |
||
957 | |||
6476 | hidnplayr | 958 | inc [TCPS_rcvdupack] |
6908 | ashmew2 | 959 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Processing duplicate ACK\n" |
3545 | hidnplayr | 960 | |
961 | ; If we have outstanding data, other than a window probe, this is a completely duplicate ACK |
||
962 | ; (window info didnt change) The ACK is the biggest we've seen and we've seen exactly our rexmt threshold of them, |
||
963 | ; assume a packet has been dropped and retransmit it. Kludge snd_nxt & the congestion window so we send only this one packet. |
||
964 | |||
3600 | hidnplayr | 965 | test [ebx + TCP_SOCKET.timer_flags], timer_flag_retransmission |
6476 | hidnplayr | 966 | jz .reset_dupacks |
3545 | hidnplayr | 967 | |
968 | mov eax, [edx + TCP_header.AckNumber] |
||
969 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
6476 | hidnplayr | 970 | jne .reset_dupacks |
3545 | hidnplayr | 971 | |
6476 | hidnplayr | 972 | ; Increment dupplicat ACK counter |
973 | ; If it reaches the threshold, re-transmit the missing segment |
||
3545 | hidnplayr | 974 | |
975 | inc [ebx + TCP_SOCKET.t_dupacks] |
||
976 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
||
6476 | hidnplayr | 977 | jb .dup_ack_complete |
978 | ja .another_lost |
||
3545 | hidnplayr | 979 | |
6908 | ashmew2 | 980 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Re-transmitting lost segment\n" |
6476 | hidnplayr | 981 | |
3545 | hidnplayr | 982 | push [ebx + TCP_SOCKET.SND_NXT] ; >>>> |
983 | |||
984 | mov eax, [ebx + TCP_SOCKET.SND_WND] |
||
985 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
||
4296 | hidnplayr | 986 | jbe @f |
987 | mov eax, [ebx + TCP_SOCKET.SND_CWND] |
||
988 | @@: |
||
3545 | hidnplayr | 989 | shr eax, 1 |
990 | push edx |
||
991 | xor edx, edx |
||
992 | div [ebx + TCP_SOCKET.t_maxseg] |
||
993 | cmp eax, 2 |
||
994 | ja @f |
||
995 | xor eax, eax |
||
996 | mov al, 2 |
||
997 | @@: |
||
998 | mul [ebx + TCP_SOCKET.t_maxseg] |
||
999 | pop edx |
||
1000 | mov [ebx + TCP_SOCKET.SND_SSTHRESH], eax |
||
1001 | |||
3600 | hidnplayr | 1002 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission ; turn off retransmission timer |
3545 | hidnplayr | 1003 | mov [ebx + TCP_SOCKET.t_rtt], 0 |
1004 | mov eax, [edx + TCP_header.AckNumber] |
||
1005 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1006 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
1007 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
1008 | |||
1009 | ; Unlock the socket |
||
6476 | hidnplayr | 1010 | |
3545 | hidnplayr | 1011 | push ebx |
1012 | lea ecx, [ebx + SOCKET.mutex] |
||
1013 | call mutex_unlock |
||
1014 | |||
1015 | ; retransmit missing segment |
||
6476 | hidnplayr | 1016 | |
3545 | hidnplayr | 1017 | mov eax, [esp] |
6011 | hidnplayr | 1018 | call tcp_output |
3545 | hidnplayr | 1019 | |
1020 | ; Lock the socket again |
||
6476 | hidnplayr | 1021 | |
3545 | hidnplayr | 1022 | mov ecx, [esp] |
1023 | add ecx, SOCKET.mutex |
||
1024 | call mutex_lock |
||
3711 | clevermous | 1025 | pop ebx |
3545 | hidnplayr | 1026 | |
1027 | ; Continue processing |
||
6476 | hidnplayr | 1028 | |
3545 | hidnplayr | 1029 | xor edx, edx |
1030 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
1031 | mul [ebx + TCP_SOCKET.t_dupacks] |
||
1032 | add eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
||
1033 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
1034 | |||
1035 | pop eax ; <<<< |
||
1036 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
1037 | jb @f |
||
1038 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1039 | @@: |
||
1040 | jmp .drop |
||
1041 | |||
6476 | hidnplayr | 1042 | .another_lost: |
6908 | ashmew2 | 1043 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Increasing congestion window\n" |
3545 | hidnplayr | 1044 | |
1045 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
1046 | add [ebx + TCP_SOCKET.SND_CWND], eax |
||
1047 | |||
1048 | ; Unlock the socket |
||
6476 | hidnplayr | 1049 | |
3545 | hidnplayr | 1050 | push ebx |
1051 | lea ecx, [ebx + SOCKET.mutex] |
||
1052 | call mutex_unlock |
||
1053 | |||
6476 | hidnplayr | 1054 | ; retransmit missing segment, again |
1055 | |||
3545 | hidnplayr | 1056 | mov eax, [esp] |
6011 | hidnplayr | 1057 | call tcp_output |
3545 | hidnplayr | 1058 | |
1059 | ; Lock the socket again |
||
6476 | hidnplayr | 1060 | |
3545 | hidnplayr | 1061 | mov ecx, [esp] |
1062 | add ecx, SOCKET.mutex |
||
1063 | call mutex_lock |
||
1064 | pop ebx |
||
1065 | |||
6476 | hidnplayr | 1066 | ; And drop the incoming segment |
1067 | |||
3545 | hidnplayr | 1068 | jmp .drop |
1069 | |||
6476 | hidnplayr | 1070 | .reset_dupacks: ; We got a new ACK, reset duplicate ACK counter |
1071 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
||
1072 | jmp .ack_processed |
||
3545 | hidnplayr | 1073 | |
6476 | hidnplayr | 1074 | .dup_ack_complete: |
3545 | hidnplayr | 1075 | |
1076 | ;------------------------------------------------- |
||
1077 | ; If the congestion window was inflated to account |
||
1078 | ; for the other side's cached packets, retract it |
||
1079 | |||
1080 | mov eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
||
1081 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
||
1082 | ja @f |
||
1083 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
||
1084 | jbe @f |
||
1085 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
1086 | @@: |
||
1087 | |||
1088 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
||
1089 | |||
1090 | mov eax, [edx + TCP_header.AckNumber] |
||
1091 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
1092 | jbe @f |
||
5442 | hidnplayr | 1093 | inc [TCPS_rcvacktoomuch] |
3545 | hidnplayr | 1094 | jmp .drop_after_ack |
1095 | @@: |
||
1096 | |||
1097 | mov edi, [edx + TCP_header.AckNumber] |
||
1098 | sub edi, [ebx + TCP_SOCKET.SND_UNA] ; now we got the number of acked bytes in edi |
||
5442 | hidnplayr | 1099 | inc [TCPS_rcvackpack] |
1100 | add [TCPS_rcvackbyte], edi |
||
6908 | ashmew2 | 1101 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: acceptable ACK for %u bytes\n", edi |
3545 | hidnplayr | 1102 | |
6476 | hidnplayr | 1103 | ;----------------------------------------------------------------------------------- |
1104 | ; |
||
4347 | hidnplayr | 1105 | ; RTT measurements and retransmission timer |
6476 | hidnplayr | 1106 | ; |
1107 | ;----------------------------------------------------------------------------------- |
||
3545 | hidnplayr | 1108 | |
1109 | ; If we have a timestamp, update smoothed RTT |
||
1110 | |||
4347 | hidnplayr | 1111 | test [temp_bits], TCP_BIT_TIMESTAMP |
3545 | hidnplayr | 1112 | jz .timestamp_not_present |
4344 | hidnplayr | 1113 | mov eax, [timestamp] |
3545 | hidnplayr | 1114 | sub eax, [ebx + TCP_SOCKET.ts_ecr] |
1115 | inc eax |
||
6011 | hidnplayr | 1116 | call tcp_xmit_timer |
3545 | hidnplayr | 1117 | jmp .rtt_done_ |
1118 | |||
1119 | ; If no timestamp but transmit timer is running and timed sequence number was acked, |
||
1120 | ; update smoothed RTT. Since we now have an RTT measurement, cancel the timer backoff |
||
1121 | ; (Phil Karn's retransmit algo) |
||
1122 | ; Recompute the initial retransmit timer |
||
1123 | |||
1124 | .timestamp_not_present: |
||
1125 | mov eax, [edx + TCP_header.AckNumber] |
||
1126 | cmp eax, [ebx + TCP_SOCKET.t_rtseq] |
||
1127 | jbe .rtt_done_ |
||
1128 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
||
1129 | test eax, eax |
||
1130 | jz .rtt_done_ |
||
6011 | hidnplayr | 1131 | call tcp_xmit_timer |
3545 | hidnplayr | 1132 | .rtt_done_: |
1133 | |||
1134 | ; If all outstanding data is acked, stop retransmit timer and remember to restart (more output or persist) |
||
1135 | ; If there is more data to be acked, restart retransmit timer, using current (possible backed-off) value. |
||
1136 | |||
1137 | mov eax, [ebx + TCP_SOCKET.SND_MAX] |
||
1138 | cmp eax, [edx + TCP_header.AckNumber] |
||
1139 | jne .more_data |
||
3600 | hidnplayr | 1140 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission |
4347 | hidnplayr | 1141 | or [temp_bits], TCP_BIT_NEEDOUTPUT |
3545 | hidnplayr | 1142 | jmp .no_restart |
1143 | .more_data: |
||
3600 | hidnplayr | 1144 | test [ebx + TCP_SOCKET.timer_flags], timer_flag_persist |
1145 | jnz .no_restart |
||
3545 | hidnplayr | 1146 | |
1147 | mov eax, [ebx + TCP_SOCKET.t_rxtcur] |
||
1148 | mov [ebx + TCP_SOCKET.timer_retransmission], eax |
||
3600 | hidnplayr | 1149 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_retransmission |
3545 | hidnplayr | 1150 | .no_restart: |
1151 | |||
6476 | hidnplayr | 1152 | ;----------------------------------------------------------------------------------- |
1153 | ; |
||
3545 | hidnplayr | 1154 | ; Open congestion window in response to ACKs |
6476 | hidnplayr | 1155 | ; |
1156 | ;----------------------------------------------------------------------------------- |
||
3545 | hidnplayr | 1157 | |
6476 | hidnplayr | 1158 | ; If the window gives us less then sstresh packets in flight, open exponentially. |
1159 | ; Otherwise, open lineary |
||
1160 | |||
3545 | hidnplayr | 1161 | mov esi, [ebx + TCP_SOCKET.SND_CWND] |
1162 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
1163 | cmp esi, [ebx + TCP_SOCKET.SND_SSTHRESH] |
||
1164 | jbe @f |
||
1165 | push edx |
||
1166 | push eax |
||
6476 | hidnplayr | 1167 | mul eax ; t_maxseg*t_maxseg |
1168 | div esi ; t_maxseg*t_maxseg/snd_cwnd |
||
1169 | pop edx ; t_maxseg |
||
1170 | shr edx, 3 ; t_maxseg/8 |
||
1171 | add eax, edx ; t_maxseg*t_maxseg/snd_cwnd + t_maxseg/8 |
||
3545 | hidnplayr | 1172 | pop edx |
1173 | @@: |
||
1174 | add esi, eax |
||
1175 | |||
1176 | push ecx |
||
1177 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
||
1178 | mov eax, TCP_max_win |
||
1179 | shl eax, cl |
||
1180 | pop ecx |
||
1181 | |||
1182 | cmp esi, eax |
||
4296 | hidnplayr | 1183 | jbe @f |
1184 | mov esi, eax |
||
1185 | @@: |
||
3545 | hidnplayr | 1186 | mov [ebx + TCP_SOCKET.SND_CWND], esi |
1187 | |||
6476 | hidnplayr | 1188 | ;----------------------------------------------------------------------------------- |
1189 | ; |
||
3545 | hidnplayr | 1190 | ; Remove acknowledged data from send buffer |
6476 | hidnplayr | 1191 | ; |
1192 | ;----------------------------------------------------------------------------------- |
||
3545 | hidnplayr | 1193 | |
6476 | hidnplayr | 1194 | ; If the number of bytes acknowledged exceeds the number of bytes on the send buffer, |
1195 | ; snd_wnd is decremented by the number of bytes in the send buffer and TCP knows |
||
1196 | ; that its FIN has been ACKed. (FIN occupies 1 byte in the sequence number space) |
||
1197 | |||
3545 | hidnplayr | 1198 | cmp edi, [ebx + STREAM_SOCKET.snd.size] |
6476 | hidnplayr | 1199 | jbe .no_fin_ack |
3545 | hidnplayr | 1200 | |
6476 | hidnplayr | 1201 | ; Drop all data in output buffer |
1202 | |||
3545 | hidnplayr | 1203 | push ecx edx ebx |
1204 | mov ecx, [ebx + STREAM_SOCKET.snd.size] |
||
6476 | hidnplayr | 1205 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
3545 | hidnplayr | 1206 | lea eax, [ebx + STREAM_SOCKET.snd] |
6011 | hidnplayr | 1207 | call socket_ring_free |
3545 | hidnplayr | 1208 | pop ebx edx ecx |
1209 | |||
6908 | ashmew2 | 1210 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: our FIN is acked\n" |
5133 | hidnplayr | 1211 | or [temp_bits], TCP_BIT_FIN_IS_ACKED |
6476 | hidnplayr | 1212 | jmp .ack_complete |
1213 | .no_fin_ack: |
||
3545 | hidnplayr | 1214 | |
6476 | hidnplayr | 1215 | ; Drop acknowledged data |
3545 | hidnplayr | 1216 | |
1217 | push ecx edx ebx |
||
1218 | mov ecx, edi |
||
1219 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
6011 | hidnplayr | 1220 | call socket_ring_free |
3545 | hidnplayr | 1221 | pop ebx |
1222 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
||
1223 | pop edx ecx |
||
6476 | hidnplayr | 1224 | .ack_complete: |
3545 | hidnplayr | 1225 | |
6476 | hidnplayr | 1226 | ;----------------------------------------------------------------------------------- |
1227 | ; |
||
3545 | hidnplayr | 1228 | ; Wake up process waiting on send buffer |
6476 | hidnplayr | 1229 | ; |
1230 | ;----------------------------------------------------------------------------------- |
||
3545 | hidnplayr | 1231 | |
1232 | mov eax, ebx |
||
6011 | hidnplayr | 1233 | call socket_notify |
3545 | hidnplayr | 1234 | |
1235 | ; Update TCPS |
||
6476 | hidnplayr | 1236 | |
3545 | hidnplayr | 1237 | mov eax, [edx + TCP_header.AckNumber] |
1238 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
1239 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
1240 | jb @f |
||
1241 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1242 | @@: |
||
1243 | |||
6476 | hidnplayr | 1244 | ;----------------------------------------------------------------------------------- |
1245 | ; |
||
1246 | ; State specific ACK handeling |
||
1247 | ; |
||
1248 | ;----------------------------------------------------------------------------------- |
||
3545 | hidnplayr | 1249 | |
1250 | mov eax, [ebx + TCP_SOCKET.t_state] |
||
6476 | hidnplayr | 1251 | jmp dword[.ack_sw_list+eax*4] |
3545 | hidnplayr | 1252 | |
6476 | hidnplayr | 1253 | .ack_sw_list: |
3545 | hidnplayr | 1254 | dd .ack_processed ; TCPS_CLOSED |
1255 | dd .ack_processed ; TCPS_LISTEN |
||
1256 | dd .ack_processed ; TCPS_SYN_SENT |
||
1257 | dd .ack_processed ; TCPS_SYN_RECEIVED |
||
1258 | dd .ack_processed ; TCPS_ESTABLISHED |
||
1259 | dd .ack_processed ; TCPS_CLOSE_WAIT |
||
1260 | dd .ack_fw1 ; TCPS_FIN_WAIT_1 |
||
1261 | dd .ack_c ; TCPS_CLOSING |
||
1262 | dd .ack_la ; TCPS_LAST_ACK |
||
1263 | dd .ack_processed ; TCPS_FIN_WAIT_2 |
||
1264 | dd .ack_tw ; TCPS_TIMED_WAIT |
||
1265 | |||
6476 | hidnplayr | 1266 | ;----------------------------------------------------------------------------------- |
1267 | .ack_fw1: |
||
1268 | ; If our FIN is now acked, enter FIN_WAIT_2 |
||
3545 | hidnplayr | 1269 | |
5133 | hidnplayr | 1270 | test [temp_bits], TCP_BIT_FIN_IS_ACKED |
1271 | jz .ack_processed |
||
3545 | hidnplayr | 1272 | |
6476 | hidnplayr | 1273 | ; If we can't receive any more data, then closing user can proceed. |
1274 | ; Starting the timer is contrary to the specification, but if we dont get a FIN, |
||
1275 | ; we'll hang forever. |
||
1276 | |||
3545 | hidnplayr | 1277 | test [ebx + SOCKET.state], SS_CANTRCVMORE |
7974 | hidnplayr | 1278 | jz @f |
3545 | hidnplayr | 1279 | mov eax, ebx |
6011 | hidnplayr | 1280 | call socket_is_disconnected |
3545 | hidnplayr | 1281 | mov [ebx + TCP_SOCKET.timer_timed_wait], TCP_time_max_idle |
3600 | hidnplayr | 1282 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
3545 | hidnplayr | 1283 | @@: |
1284 | mov [ebx + TCP_SOCKET.t_state], TCPS_FIN_WAIT_2 |
||
1285 | jmp .ack_processed |
||
1286 | |||
6476 | hidnplayr | 1287 | ;----------------------------------------------------------------------------------- |
3545 | hidnplayr | 1288 | .ack_c: |
6476 | hidnplayr | 1289 | ; Enter the TIME_WAIT state if our FIN is acked in CLOSED state. |
1290 | |||
5133 | hidnplayr | 1291 | test [temp_bits], TCP_BIT_FIN_IS_ACKED |
1292 | jz .ack_processed |
||
3545 | hidnplayr | 1293 | |
6476 | hidnplayr | 1294 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIME_WAIT |
3545 | hidnplayr | 1295 | mov eax, ebx |
6011 | hidnplayr | 1296 | call tcp_cancel_timers |
3545 | hidnplayr | 1297 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
3600 | hidnplayr | 1298 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
3545 | hidnplayr | 1299 | mov eax, ebx |
6011 | hidnplayr | 1300 | call socket_is_disconnected |
3545 | hidnplayr | 1301 | jmp .ack_processed |
1302 | |||
6476 | hidnplayr | 1303 | ;----------------------------------------------------------------------------------- |
3545 | hidnplayr | 1304 | .ack_la: |
6476 | hidnplayr | 1305 | ; In LAST_ACK state, we may still be waiting for data to drain and/or to be acked. |
1306 | ; If our FIN is acked however, enter CLOSED state and return. |
||
1307 | |||
5133 | hidnplayr | 1308 | test [temp_bits], TCP_BIT_FIN_IS_ACKED |
1309 | jz .ack_processed |
||
3545 | hidnplayr | 1310 | |
6710 | clevermous | 1311 | .unlock_and_close: |
3652 | hidnplayr | 1312 | push ebx |
1313 | lea ecx, [ebx + SOCKET.mutex] |
||
1314 | call mutex_unlock |
||
6476 | hidnplayr | 1315 | pop eax |
3652 | hidnplayr | 1316 | |
6011 | hidnplayr | 1317 | call tcp_close |
4366 | hidnplayr | 1318 | jmp .drop_no_socket |
3545 | hidnplayr | 1319 | |
6476 | hidnplayr | 1320 | ;----------------------------------------------------------------------------------- |
3545 | hidnplayr | 1321 | .ack_tw: |
6476 | hidnplayr | 1322 | ; In TIME_WAIT state the only thing that should arrive is a retransmission of the remote FIN. |
1323 | ; Acknowledge it and restart the FINACK timer |
||
1324 | |||
1325 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2*TCP_time_MSL |
||
1326 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_2msl |
||
3545 | hidnplayr | 1327 | jmp .drop_after_ack |
1328 | |||
6476 | hidnplayr | 1329 | ;----------------------------------------------------------------------------------- |
1330 | ; |
||
1331 | ; Initiation of Passive Open? |
||
1332 | ; |
||
1333 | ;----------------------------------------------------------------------------------- |
||
3545 | hidnplayr | 1334 | |
6476 | hidnplayr | 1335 | .state_listen: |
6908 | ashmew2 | 1336 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: state=listen\n" |
3545 | hidnplayr | 1337 | |
1338 | test [edx + TCP_header.Flags], TH_RST |
||
1339 | jnz .drop |
||
1340 | |||
1341 | test [edx + TCP_header.Flags], TH_ACK |
||
1342 | jnz .drop_with_reset |
||
1343 | |||
1344 | test [edx + TCP_header.Flags], TH_SYN |
||
1345 | jz .drop |
||
1346 | |||
6476 | hidnplayr | 1347 | inc [TCPS_accepts] |
5442 | hidnplayr | 1348 | |
3545 | hidnplayr | 1349 | ;;; TODO: check if it's a broadcast or multicast, and drop if so |
1350 | |||
6476 | hidnplayr | 1351 | ;------------------------------------------- |
1352 | ; Processing of SYN received in LISTEN state |
||
1353 | |||
5842 | hidnplayr | 1354 | push [edi + IPv4_header.SourceAddress] |
3545 | hidnplayr | 1355 | pop [ebx + IP_SOCKET.RemoteIP] |
1356 | |||
1357 | push [edx + TCP_header.SourcePort] |
||
1358 | pop [ebx + TCP_SOCKET.RemotePort] |
||
1359 | |||
1360 | push [edx + TCP_header.SequenceNumber] |
||
1361 | pop [ebx + TCP_SOCKET.IRS] |
||
1362 | |||
1363 | mov eax, [TCP_sequence_num] |
||
6476 | hidnplayr | 1364 | add [TCP_sequence_num], TCP_ISSINCR / 2 |
3545 | hidnplayr | 1365 | mov [ebx + TCP_SOCKET.ISS], eax |
1366 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1367 | |||
6011 | hidnplayr | 1368 | tcp_sendseqinit ebx |
1369 | tcp_rcvseqinit ebx |
||
3545 | hidnplayr | 1370 | |
1371 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
||
4347 | hidnplayr | 1372 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
3545 | hidnplayr | 1373 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval ;;;; macro |
3600 | hidnplayr | 1374 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_keepalive |
3545 | hidnplayr | 1375 | |
1376 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
6011 | hidnplayr | 1377 | call socket_ring_create |
5155 | hidnplayr | 1378 | test eax, eax |
1379 | jz .drop |
||
3545 | hidnplayr | 1380 | |
1381 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
6011 | hidnplayr | 1382 | call socket_ring_create |
5155 | hidnplayr | 1383 | test eax, eax |
1384 | jz .drop |
||
3545 | hidnplayr | 1385 | |
4347 | hidnplayr | 1386 | and [temp_bits], not TCP_BIT_DROPSOCKET |
3545 | hidnplayr | 1387 | |
3674 | hidnplayr | 1388 | pusha |
1389 | mov eax, ebx |
||
6011 | hidnplayr | 1390 | call socket_notify |
3674 | hidnplayr | 1391 | popa |
3545 | hidnplayr | 1392 | |
5133 | hidnplayr | 1393 | jmp .trim |
3545 | hidnplayr | 1394 | |
6476 | hidnplayr | 1395 | ;----------------------------------------------------------------------------------- |
1396 | ; |
||
1397 | ; Completion of active open? |
||
1398 | ; |
||
1399 | ;----------------------------------------------------------------------------------- |
||
3545 | hidnplayr | 1400 | |
6476 | hidnplayr | 1401 | .state_syn_sent: |
6908 | ashmew2 | 1402 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: state=syn_sent\n" |
3545 | hidnplayr | 1403 | |
1404 | test [edx + TCP_header.Flags], TH_ACK |
||
1405 | jz @f |
||
1406 | |||
1407 | mov eax, [edx + TCP_header.AckNumber] |
||
1408 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
1409 | jbe .drop_with_reset |
||
1410 | |||
1411 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
1412 | ja .drop_with_reset |
||
1413 | @@: |
||
1414 | |||
1415 | test [edx + TCP_header.Flags], TH_RST |
||
1416 | jz @f |
||
1417 | |||
1418 | test [edx + TCP_header.Flags], TH_ACK |
||
1419 | jz .drop |
||
1420 | |||
1421 | mov eax, ebx |
||
1422 | mov ebx, ECONNREFUSED |
||
6011 | hidnplayr | 1423 | call tcp_drop |
3545 | hidnplayr | 1424 | jmp .drop |
1425 | @@: |
||
1426 | |||
6476 | hidnplayr | 1427 | ;----------------------------------------------------------------------------------- |
1428 | ; |
||
1429 | ; Process received SYN in response to an active open |
||
1430 | ; |
||
1431 | ;----------------------------------------------------------------------------------- |
||
1432 | |||
3545 | hidnplayr | 1433 | test [edx + TCP_header.Flags], TH_SYN |
1434 | jz .drop |
||
1435 | |||
1436 | test [edx + TCP_header.Flags], TH_ACK |
||
6476 | hidnplayr | 1437 | jz @f |
3545 | hidnplayr | 1438 | |
1439 | mov eax, [edx + TCP_header.AckNumber] |
||
1440 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
1441 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
1442 | jbe @f |
||
1443 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1444 | |||
3600 | hidnplayr | 1445 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission ; disable retransmission timer |
6476 | hidnplayr | 1446 | @@: |
3545 | hidnplayr | 1447 | |
1448 | push [edx + TCP_header.SequenceNumber] |
||
1449 | pop [ebx + TCP_SOCKET.IRS] |
||
1450 | |||
6011 | hidnplayr | 1451 | tcp_rcvseqinit ebx |
3545 | hidnplayr | 1452 | |
1453 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1454 | |||
1455 | mov eax, [ebx + TCP_SOCKET.SND_UNA] |
||
1456 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
1457 | jbe .simultaneous_open |
||
1458 | |||
1459 | test [edx + TCP_header.Flags], TH_ACK |
||
1460 | jz .simultaneous_open |
||
1461 | |||
6908 | ashmew2 | 1462 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: active open\n" |
3545 | hidnplayr | 1463 | |
6476 | hidnplayr | 1464 | inc [TCPS_connects] |
3545 | hidnplayr | 1465 | |
1466 | ; set socket state to connected |
||
6476 | hidnplayr | 1467 | |
3674 | hidnplayr | 1468 | push eax |
1469 | mov eax, ebx |
||
6011 | hidnplayr | 1470 | call socket_is_connected |
3674 | hidnplayr | 1471 | pop eax |
3545 | hidnplayr | 1472 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
1473 | |||
1474 | ; Do window scaling on this connection ? |
||
6476 | hidnplayr | 1475 | |
3545 | hidnplayr | 1476 | mov eax, [ebx + TCP_SOCKET.t_flags] |
1477 | and eax, TF_REQ_SCALE or TF_RCVD_SCALE |
||
1478 | cmp eax, TF_REQ_SCALE or TF_RCVD_SCALE |
||
1479 | jne .no_scaling |
||
1480 | |||
6011 | hidnplayr | 1481 | mov ax, word[ebx + TCP_SOCKET.requested_s_scale] |
1482 | mov word[ebx + TCP_SOCKET.SND_SCALE], ax |
||
3545 | hidnplayr | 1483 | .no_scaling: |
1484 | |||
1485 | ;;; TODO: reassemble packets queue |
||
1486 | |||
6476 | hidnplayr | 1487 | ; If we didnt have time to re-transmit the SYN, |
1488 | ; Use its rtt as our initial srtt & rtt var. |
||
1489 | |||
3545 | hidnplayr | 1490 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
1491 | test eax, eax |
||
5133 | hidnplayr | 1492 | je .trim |
6011 | hidnplayr | 1493 | call tcp_xmit_timer |
5133 | hidnplayr | 1494 | jmp .trim |
3545 | hidnplayr | 1495 | |
6476 | hidnplayr | 1496 | ;----------------------------------------------------------------------------------- |
1497 | ; |
||
1498 | ; Simultaneous open (We have received a SYN but no ACK) |
||
1499 | ; |
||
1500 | ;----------------------------------------------------------------------------------- |
||
1501 | |||
3545 | hidnplayr | 1502 | .simultaneous_open: |
6908 | ashmew2 | 1503 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: simultaneous open\n" |
3545 | hidnplayr | 1504 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
1505 | |||
6476 | hidnplayr | 1506 | ;----------------------------------------------------------------------------------- |
1507 | ; |
||
3545 | hidnplayr | 1508 | ; Common processing for receipt of SYN |
6476 | hidnplayr | 1509 | ; |
1510 | ;----------------------------------------------------------------------------------- |
||
3545 | hidnplayr | 1511 | |
5133 | hidnplayr | 1512 | .trim: |
6476 | hidnplayr | 1513 | ; Advance sequence number to correspond to first data byte. |
1514 | ; If data, trim to stay within window, dropping FIN if necessary |
||
1515 | |||
3545 | hidnplayr | 1516 | inc [edx + TCP_header.SequenceNumber] |
1517 | |||
4339 | hidnplayr | 1518 | ; Drop any received data that doesnt fit in the receive window. |
6476 | hidnplayr | 1519 | |
4339 | hidnplayr | 1520 | cmp ecx, [ebx + TCP_SOCKET.RCV_WND] |
1521 | jbe .dont_trim |
||
3545 | hidnplayr | 1522 | |
6908 | ashmew2 | 1523 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: received data does not fit in window, trimming %u bytes\n", eax |
6476 | hidnplayr | 1524 | inc [TCPS_rcvpackafterwin] |
1525 | sub ecx, [ebx + TCP_SOCKET.RCV_WND] |
||
1526 | add [TCPS_rcvbyteafterwin], ecx |
||
1527 | |||
1528 | and [edx + TCP_header.Flags], not (TH_FIN) |
||
4339 | hidnplayr | 1529 | mov ecx, [ebx + TCP_SOCKET.RCV_WND] |
1530 | |||
1531 | .dont_trim: |
||
3545 | hidnplayr | 1532 | mov eax, [edx + TCP_header.SequenceNumber] |
1533 | mov [ebx + TCP_SOCKET.RCV_UP], eax |
||
1534 | dec eax |
||
1535 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
1536 | |||
6476 | hidnplayr | 1537 | ;----------------------------------------------------------------------------------- |
1538 | ; |
||
1539 | ; Update window information (step 6 in RFC793) |
||
1540 | ; |
||
1541 | ;----------------------------------------------------------------------------------- |
||
1542 | |||
3545 | hidnplayr | 1543 | .ack_processed: |
6908 | ashmew2 | 1544 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: ACK processed\n" |
3545 | hidnplayr | 1545 | |
6476 | hidnplayr | 1546 | ; dont look at window if no ACK |
3545 | hidnplayr | 1547 | |
1548 | test [edx + TCP_header.Flags], TH_ACK |
||
1549 | jz .no_window_update |
||
1550 | |||
6476 | hidnplayr | 1551 | ; Does the segment contain new data? |
1552 | |||
3545 | hidnplayr | 1553 | mov eax, [ebx + TCP_SOCKET.SND_WL1] |
1554 | cmp eax, [edx + TCP_header.SequenceNumber] |
||
1555 | jb .update_window |
||
1556 | ja @f |
||
1557 | |||
6476 | hidnplayr | 1558 | ; No new data but a new ACK ? |
1559 | |||
3545 | hidnplayr | 1560 | mov eax, [ebx + TCP_SOCKET.SND_WL2] |
1561 | cmp eax, [edx + TCP_header.AckNumber] |
||
1562 | jb .update_window |
||
1563 | @@: |
||
1564 | |||
6476 | hidnplayr | 1565 | ; No new data or ACK but advertised window is larger then current window? |
1566 | |||
1567 | mov eax, [ebx + TCP_SOCKET.SND_WL2] |
||
1568 | cmp eax, [edx + TCP_header.AckNumber] |
||
1569 | jne .no_window_update |
||
1570 | |||
1571 | mov eax, dword[edx + TCP_header.Window] |
||
3545 | hidnplayr | 1572 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
1573 | jbe .no_window_update |
||
1574 | |||
6476 | hidnplayr | 1575 | |
1576 | ; Keep track of pure window updates |
||
3545 | hidnplayr | 1577 | .update_window: |
6476 | hidnplayr | 1578 | test ecx, ecx |
1579 | jnz @f |
||
1580 | mov eax, [ebx + TCP_SOCKET.SND_WL2] |
||
1581 | cmp eax, [edx + TCP_header.AckNumber] |
||
1582 | jne @f |
||
1583 | mov eax, dword[edx + TCP_header.Window] |
||
1584 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
1585 | jbe @f |
||
1586 | inc [TCPS_rcvwinupd] |
||
1587 | @@: |
||
3545 | hidnplayr | 1588 | |
6476 | hidnplayr | 1589 | mov eax, dword[edx + TCP_header.Window] |
1590 | mov [ebx + TCP_SOCKET.SND_WND], eax |
||
3545 | hidnplayr | 1591 | cmp eax, [ebx + TCP_SOCKET.max_sndwnd] |
1592 | jbe @f |
||
1593 | mov [ebx + TCP_SOCKET.max_sndwnd], eax |
||
1594 | @@: |
||
1595 | |||
6908 | ashmew2 | 1596 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Updating window to %u\n", eax |
3545 | hidnplayr | 1597 | |
1598 | push [edx + TCP_header.SequenceNumber] |
||
1599 | pop [ebx + TCP_SOCKET.SND_WL1] |
||
1600 | |||
1601 | push [edx + TCP_header.AckNumber] |
||
1602 | pop [ebx + TCP_SOCKET.SND_WL2] |
||
1603 | |||
4347 | hidnplayr | 1604 | or [temp_bits], TCP_BIT_NEEDOUTPUT |
3545 | hidnplayr | 1605 | .no_window_update: |
1606 | |||
6476 | hidnplayr | 1607 | ;----------------------------------------------------------------------------------- |
1608 | ; |
||
1609 | ; Process URG flag |
||
1610 | ; |
||
1611 | ;----------------------------------------------------------------------------------- |
||
3545 | hidnplayr | 1612 | |
1613 | test [edx + TCP_header.Flags], TH_URG |
||
1614 | jz .not_urgent |
||
1615 | |||
1616 | cmp [edx + TCP_header.UrgentPointer], 0 |
||
1617 | jz .not_urgent |
||
1618 | |||
6476 | hidnplayr | 1619 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIME_WAIT |
3545 | hidnplayr | 1620 | je .not_urgent |
1621 | |||
1622 | ; Ignore bogus urgent offsets |
||
1623 | |||
1624 | movzx eax, [edx + TCP_header.UrgentPointer] |
||
1625 | add eax, [ebx + STREAM_SOCKET.rcv.size] |
||
6413 | hidnplayr | 1626 | cmp eax, SOCKET_BUFFER_SIZE |
3545 | hidnplayr | 1627 | jbe .not_urgent |
1628 | |||
1629 | mov [edx + TCP_header.UrgentPointer], 0 |
||
1630 | and [edx + TCP_header.Flags], not (TH_URG) |
||
1631 | jmp .do_data |
||
1632 | |||
1633 | .not_urgent: |
||
1634 | |||
1635 | ; processing of received urgent pointer |
||
1636 | |||
1637 | ;;; TODO (1051-1093) |
||
1638 | |||
6476 | hidnplayr | 1639 | ;----------------------------------------------------------------------------------- |
1640 | ; |
||
1641 | ; Process the data |
||
1642 | ; |
||
1643 | ;----------------------------------------------------------------------------------- |
||
3545 | hidnplayr | 1644 | |
1645 | .do_data: |
||
6476 | hidnplayr | 1646 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIME_WAIT |
3545 | hidnplayr | 1647 | jae .final_processing |
1648 | |||
1649 | test [edx + TCP_header.Flags], TH_FIN |
||
1650 | jnz @f |
||
1651 | |||
1652 | test ecx, ecx |
||
3756 | hidnplayr | 1653 | jz .final_processing |
3545 | hidnplayr | 1654 | @@: |
1655 | |||
1656 | ; The segment is in order? |
||
6476 | hidnplayr | 1657 | |
3545 | hidnplayr | 1658 | mov eax, [edx + TCP_header.SequenceNumber] |
1659 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
1660 | jne .out_of_order |
||
1661 | |||
1662 | ; The reassembly queue is empty? |
||
6476 | hidnplayr | 1663 | |
3545 | hidnplayr | 1664 | cmp [ebx + TCP_SOCKET.seg_next], 0 |
1665 | jne .out_of_order |
||
1666 | |||
1667 | ; The connection is established? |
||
6476 | hidnplayr | 1668 | |
3545 | hidnplayr | 1669 | cmp [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
1670 | jne .out_of_order |
||
1671 | |||
1672 | ; Ok, lets do this.. Set delayed ACK flag and copy data into socket buffer |
||
6476 | hidnplayr | 1673 | |
3545 | hidnplayr | 1674 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK |
1675 | |||
1676 | pusha |
||
4339 | hidnplayr | 1677 | mov esi, [dataoffset] |
3545 | hidnplayr | 1678 | add esi, edx |
1679 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
6011 | hidnplayr | 1680 | call socket_ring_write ; Add the data to the socket buffer |
3545 | hidnplayr | 1681 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
1682 | popa |
||
1683 | |||
1684 | ; Wake up the sleeping process |
||
6476 | hidnplayr | 1685 | |
3545 | hidnplayr | 1686 | mov eax, ebx |
6011 | hidnplayr | 1687 | call socket_notify |
3545 | hidnplayr | 1688 | |
1689 | jmp .data_done |
||
1690 | |||
1691 | .out_of_order: |
||
6908 | ashmew2 | 1692 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP data is out of order!\nSequencenumber is %u, we expected %u.\n", \ |
4339 | hidnplayr | 1693 | [edx + TCP_header.SequenceNumber], [ebx + TCP_SOCKET.RCV_NXT] |
3545 | hidnplayr | 1694 | |
1695 | ; Uh-oh, some data is out of order, lets call TCP reassemble for help |
||
1696 | |||
6915 | hidnplayr | 1697 | call tcp_reassemble ;;; TODO! |
3545 | hidnplayr | 1698 | |
4339 | hidnplayr | 1699 | ; Generate ACK immediately, to let the other end know that a segment was received out of order, |
1700 | ; and to tell it what sequence number is expected. This aids the fast-retransmit algorithm. |
||
6476 | hidnplayr | 1701 | |
3545 | hidnplayr | 1702 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
6915 | hidnplayr | 1703 | |
1704 | jmp .final_processing ;;; HACK because of unimplemented reassembly queue! |
||
3545 | hidnplayr | 1705 | .data_done: |
1706 | |||
6476 | hidnplayr | 1707 | ;----------------------------------------------------------------------------------- |
1708 | ; |
||
1709 | ; Process FIN |
||
1710 | ; |
||
1711 | ;----------------------------------------------------------------------------------- |
||
3545 | hidnplayr | 1712 | |
1713 | test [edx + TCP_header.Flags], TH_FIN |
||
1714 | jz .final_processing |
||
1715 | |||
6908 | ashmew2 | 1716 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Processing FIN\n" |
3545 | hidnplayr | 1717 | |
6476 | hidnplayr | 1718 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIME_WAIT |
3545 | hidnplayr | 1719 | jae .not_first_fin |
1720 | |||
6908 | ashmew2 | 1721 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: First FIN for this connection\n" |
3545 | hidnplayr | 1722 | |
1723 | mov eax, ebx |
||
6011 | hidnplayr | 1724 | call socket_cant_recv_more |
3545 | hidnplayr | 1725 | |
4347 | hidnplayr | 1726 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
3545 | hidnplayr | 1727 | inc [ebx + TCP_SOCKET.RCV_NXT] |
1728 | |||
1729 | .not_first_fin: |
||
1730 | mov eax, [ebx + TCP_SOCKET.t_state] |
||
6476 | hidnplayr | 1731 | jmp dword[.fin_sw_list+eax*4] |
3545 | hidnplayr | 1732 | |
6476 | hidnplayr | 1733 | .fin_sw_list: |
3545 | hidnplayr | 1734 | dd .final_processing ; TCPS_CLOSED |
1735 | dd .final_processing ; TCPS_LISTEN |
||
1736 | dd .final_processing ; TCPS_SYN_SENT |
||
1737 | dd .fin_syn_est ; TCPS_SYN_RECEIVED |
||
1738 | dd .fin_syn_est ; TCPS_ESTABLISHED |
||
1739 | dd .final_processing ; TCPS_CLOSE_WAIT |
||
1740 | dd .fin_wait1 ; TCPS_FIN_WAIT_1 |
||
1741 | dd .final_processing ; TCPS_CLOSING |
||
1742 | dd .final_processing ; TCPS_LAST_ACK |
||
1743 | dd .fin_wait2 ; TCPS_FIN_WAIT_2 |
||
1744 | dd .fin_timed ; TCPS_TIMED_WAIT |
||
1745 | |||
6476 | hidnplayr | 1746 | ;----------------------------------------------------------------------------------- |
3545 | hidnplayr | 1747 | .fin_syn_est: |
6476 | hidnplayr | 1748 | ; In SYN_RECEIVED and ESTABLISHED state, enter the CLOSE_WAIT state |
1749 | |||
3545 | hidnplayr | 1750 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
1751 | jmp .final_processing |
||
1752 | |||
6476 | hidnplayr | 1753 | ;----------------------------------------------------------------------------------- |
3545 | hidnplayr | 1754 | .fin_wait1: |
6476 | hidnplayr | 1755 | ; From FIN_WAIT_1 state, enter CLOSING state (our FIN has not been ACKed) |
1756 | |||
3545 | hidnplayr | 1757 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSING |
1758 | jmp .final_processing |
||
1759 | |||
6476 | hidnplayr | 1760 | ;----------------------------------------------------------------------------------- |
3545 | hidnplayr | 1761 | .fin_wait2: |
6476 | hidnplayr | 1762 | ; From FIN_WAIT_2 state, enter TIME_WAIT state and start the timer |
1763 | |||
1764 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIME_WAIT |
||
3545 | hidnplayr | 1765 | mov eax, ebx |
6011 | hidnplayr | 1766 | call tcp_cancel_timers |
1767 | call socket_is_disconnected |
||
3545 | hidnplayr | 1768 | |
6476 | hidnplayr | 1769 | ;----------------------------------------------------------------------------------- |
3545 | hidnplayr | 1770 | .fin_timed: |
6476 | hidnplayr | 1771 | ; (re)start the 2 MSL timer |
3545 | hidnplayr | 1772 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
3600 | hidnplayr | 1773 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
3545 | hidnplayr | 1774 | |
6476 | hidnplayr | 1775 | ;----------------------------------------------------------------------------------- |
1776 | ; |
||
1777 | ; Finally, drop the segment |
||
1778 | ; |
||
1779 | ;----------------------------------------------------------------------------------- |
||
3545 | hidnplayr | 1780 | |
4347 | hidnplayr | 1781 | .final_processing: |
6908 | ashmew2 | 1782 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Final processing\n" |
4347 | hidnplayr | 1783 | |
1784 | push ebx |
||
1785 | lea ecx, [ebx + SOCKET.mutex] |
||
1786 | call mutex_unlock |
||
1787 | pop eax |
||
1788 | |||
1789 | test [temp_bits], TCP_BIT_NEEDOUTPUT |
||
1790 | jnz .need_output |
||
1791 | |||
1792 | test [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
||
5133 | hidnplayr | 1793 | jz .done |
6908 | ashmew2 | 1794 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: ACK now!\n" |
4347 | hidnplayr | 1795 | |
1796 | .need_output: |
||
6908 | ashmew2 | 1797 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: need output\n" |
6011 | hidnplayr | 1798 | call tcp_output |
4347 | hidnplayr | 1799 | |
5133 | hidnplayr | 1800 | .done: |
6908 | ashmew2 | 1801 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: dumping\n" |
4347 | hidnplayr | 1802 | |
6011 | hidnplayr | 1803 | call net_buff_free |
4347 | hidnplayr | 1804 | jmp .loop |
1805 | |||
6476 | hidnplayr | 1806 | ;----------------------------------------------------------------------------------- |
1807 | ; |
||
1808 | ; Drop segment, reply with an RST segment when needed |
||
1809 | ; |
||
1810 | ;----------------------------------------------------------------------------------- |
||
4347 | hidnplayr | 1811 | |
6476 | hidnplayr | 1812 | ;----------------------------------------------------------------------------------- |
3545 | hidnplayr | 1813 | .drop_after_ack: |
6908 | ashmew2 | 1814 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Drop after ACK\n" |
3545 | hidnplayr | 1815 | |
1816 | push edx ebx |
||
1817 | lea ecx, [ebx + SOCKET.mutex] |
||
1818 | call mutex_unlock |
||
1819 | pop eax edx |
||
1820 | |||
1821 | test [edx + TCP_header.Flags], TH_RST |
||
5133 | hidnplayr | 1822 | jnz .done |
3545 | hidnplayr | 1823 | |
1824 | or [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1825 | jmp .need_output |
||
1826 | |||
6476 | hidnplayr | 1827 | ;----------------------------------------------------------------------------------- |
3545 | hidnplayr | 1828 | .drop_with_reset: |
6908 | ashmew2 | 1829 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Drop with reset\n" |
3545 | hidnplayr | 1830 | |
1831 | push ebx edx |
||
1832 | lea ecx, [ebx + SOCKET.mutex] |
||
1833 | call mutex_unlock |
||
1834 | pop edx ebx |
||
1835 | |||
1836 | test [edx + TCP_header.Flags], TH_RST |
||
5133 | hidnplayr | 1837 | jnz .done |
3545 | hidnplayr | 1838 | |
6011 | hidnplayr | 1839 | ; TODO: if its a multicast/broadcast, also drop |
3545 | hidnplayr | 1840 | |
1841 | test [edx + TCP_header.Flags], TH_ACK |
||
1842 | jnz .respond_ack |
||
1843 | |||
1844 | test [edx + TCP_header.Flags], TH_SYN |
||
1845 | jnz .respond_syn |
||
5133 | hidnplayr | 1846 | jmp .done |
3545 | hidnplayr | 1847 | |
1848 | .respond_ack: |
||
1849 | push ebx |
||
1850 | mov cl, TH_RST |
||
6011 | hidnplayr | 1851 | call tcp_respond |
3545 | hidnplayr | 1852 | pop ebx |
1853 | jmp .destroy_new_socket |
||
1854 | |||
1855 | .respond_syn: |
||
1856 | push ebx |
||
1857 | mov cl, TH_RST + TH_ACK |
||
6011 | hidnplayr | 1858 | call tcp_respond |
3545 | hidnplayr | 1859 | pop ebx |
1860 | jmp .destroy_new_socket |
||
1861 | |||
5133 | hidnplayr | 1862 | ;----------------------------------------- |
1863 | ; The connection has no associated socket |
||
1864 | |||
3647 | hidnplayr | 1865 | .no_socket: |
1866 | pusha |
||
1867 | mov ecx, socket_mutex |
||
1868 | call mutex_unlock |
||
1869 | popa |
||
1870 | |||
3545 | hidnplayr | 1871 | .respond_seg_reset: |
1872 | test [edx + TCP_header.Flags], TH_RST |
||
1873 | jnz .drop_no_socket |
||
1874 | |||
6011 | hidnplayr | 1875 | ; TODO: if its a multicast/broadcast, also drop |
3545 | hidnplayr | 1876 | |
1877 | test [edx + TCP_header.Flags], TH_ACK |
||
1878 | jnz .respond_seg_ack |
||
1879 | |||
1880 | test [edx + TCP_header.Flags], TH_SYN |
||
1881 | jnz .respond_seg_syn |
||
1882 | |||
1883 | jmp .drop_no_socket |
||
1884 | |||
1885 | .respond_seg_ack: |
||
1886 | mov cl, TH_RST |
||
6910 | hidnplayr | 1887 | mov ebx, [device] |
6011 | hidnplayr | 1888 | call tcp_respond_segment |
3545 | hidnplayr | 1889 | jmp .drop_no_socket |
1890 | |||
1891 | .respond_seg_syn: |
||
1892 | mov cl, TH_RST + TH_ACK |
||
6910 | hidnplayr | 1893 | mov ebx, [device] |
6011 | hidnplayr | 1894 | call tcp_respond_segment |
3545 | hidnplayr | 1895 | jmp .drop_no_socket |
1896 | |||
5133 | hidnplayr | 1897 | ;------------------------------------------------ |
1898 | ; Unlock socket mutex and prepare to drop segment |
||
3545 | hidnplayr | 1899 | |
1900 | .drop: |
||
6908 | ashmew2 | 1901 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Dropping segment\n" |
3545 | hidnplayr | 1902 | |
1903 | pusha |
||
1904 | lea ecx, [ebx + SOCKET.mutex] |
||
1905 | call mutex_unlock |
||
1906 | popa |
||
1907 | |||
5133 | hidnplayr | 1908 | ;-------------------------------------------- |
1909 | ; Destroy the newly created socket if needed |
||
1910 | |||
3545 | hidnplayr | 1911 | .destroy_new_socket: |
4347 | hidnplayr | 1912 | test [temp_bits], TCP_BIT_DROPSOCKET |
3545 | hidnplayr | 1913 | jz .drop_no_socket |
1914 | |||
1915 | mov eax, ebx |
||
6011 | hidnplayr | 1916 | call socket_free |
3545 | hidnplayr | 1917 | |
5133 | hidnplayr | 1918 | ;------------------ |
1919 | ; Drop the segment |
||
1920 | |||
3545 | hidnplayr | 1921 | .drop_no_socket: |
6908 | ashmew2 | 1922 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Drop (no socket)\n" |
3545 | hidnplayr | 1923 | |
6011 | hidnplayr | 1924 | call net_buff_free |
3545 | hidnplayr | 1925 | jmp .loop |
4339 | hidnplayr | 1926 | |
1927 | endp |