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Rev | Author | Line No. | Line |
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1763 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; Copyright (C) KolibriOS team 2004-2011. All rights reserved. ;; |
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4 | ;; Distributed under terms of the GNU General Public License ;; |
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5 | ;; ;; |
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6 | ;; Part of the tcp/ip network stack for KolibriOS ;; |
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7 | ;; ;; |
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8 | ;; Written by hidnplayr@kolibrios.org ;; |
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9 | ;; ;; |
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10 | ;; Based on the code of 4.4BSD ;; |
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11 | ;; ;; |
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12 | ;; GNU GENERAL PUBLIC LICENSE ;; |
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13 | ;; Version 2, June 1991 ;; |
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14 | ;; ;; |
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15 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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16 | |||
17 | $Revision: 2309 $ |
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18 | |||
1733 | hidnplayr | 19 | ;----------------------------------------------------------------- |
20 | ; |
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21 | ; TCP_input: |
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22 | ; |
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23 | ; IN: [esp] = ptr to buffer |
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24 | ; [esp+4] = buffer size |
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25 | ; ebx = ptr to device struct |
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26 | ; ecx = segment size |
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27 | ; edx = ptr to TCP segment |
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2308 | hidnplayr | 28 | ; edi = ptr to ipv4 source address, followed by ipv4 dest address |
1733 | hidnplayr | 29 | ; |
30 | ; OUT: / |
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31 | ; |
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32 | ;----------------------------------------------------------------- |
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1830 | hidnplayr | 33 | |
1733 | hidnplayr | 34 | align 4 |
35 | TCP_input: |
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36 | |||
2309 | hidnplayr | 37 | DEBUGF 1,"TCP_input size=%u\n", ecx |
1733 | hidnplayr | 38 | |
2309 | hidnplayr | 39 | and [edx + TCP_header.DataOffset], 0xf0 ; Calculate TCP segment header size (throwing away unused reserved bits in TCP header) |
40 | shr [edx + TCP_header.DataOffset], 2 |
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41 | cmp [edx + TCP_header.DataOffset], sizeof.TCP_header ; Now see if it's at least the size of a standard TCP header |
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42 | jb .drop_not_locked ; If not, drop the packet |
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1733 | hidnplayr | 43 | |
44 | ;------------------------------- |
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45 | ; Now, re-calculate the checksum |
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46 | |||
2309 | hidnplayr | 47 | push ecx edx |
2308 | hidnplayr | 48 | pushw [edx + TCP_header.Checksum] |
49 | mov [edx + TCP_header.Checksum], 0 |
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50 | mov esi, edx |
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51 | TCP_checksum (edi), (edi+4) |
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52 | pop cx ; previous checksum |
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53 | cmp cx, dx |
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2309 | hidnplayr | 54 | pop edx ecx |
2308 | hidnplayr | 55 | jnz .drop_not_locked |
1733 | hidnplayr | 56 | |
2309 | hidnplayr | 57 | DEBUGF 1,"Checksum ok\n" |
1733 | hidnplayr | 58 | |
2309 | hidnplayr | 59 | sub ecx, [edx + TCP_header.DataOffset] ; substract TCP header size from total segment size |
60 | jb .drop_not_locked ; If total segment size is less then the advertised header size, drop packet |
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2308 | hidnplayr | 61 | DEBUGF 1,"we got %u bytes of data\n", ecx |
1733 | hidnplayr | 62 | |
63 | ;----------------------------------------------------------------------------------------- |
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64 | ; Check if this packet has a timestamp option (We do it here so we can process it quickly) |
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65 | |||
2309 | hidnplayr | 66 | cmp [edx + TCP_header.DataOffset], sizeof.TCP_header + 12 ; Timestamp option is 12 bytes |
2308 | hidnplayr | 67 | jb .no_timestamp |
68 | je .is_ok |
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1733 | hidnplayr | 69 | |
2309 | hidnplayr | 70 | cmp byte [edx + sizeof.TCP_header + 12], TCP_OPT_EOL ; end of option list |
2308 | hidnplayr | 71 | jne .no_timestamp |
1733 | hidnplayr | 72 | |
73 | .is_ok: |
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2309 | hidnplayr | 74 | test [edx + TCP_header.Flags], TH_SYN ; SYN flag must not be set |
2308 | hidnplayr | 75 | jnz .no_timestamp |
1733 | hidnplayr | 76 | |
2309 | hidnplayr | 77 | cmp dword [edx + sizeof.TCP_header], 0x0101080a ; Timestamp header |
2308 | hidnplayr | 78 | jne .no_timestamp |
1733 | hidnplayr | 79 | |
2308 | hidnplayr | 80 | DEBUGF 1,"timestamp ok\n" |
1733 | hidnplayr | 81 | |
2308 | hidnplayr | 82 | ; TODO: Parse the option |
83 | ; TODO: Set a Bit in the TCP to tell all options are parsed |
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1733 | hidnplayr | 84 | |
85 | .no_timestamp: |
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86 | |||
87 | ;------------------------------------------- |
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88 | ; Convert Big-endian values to little endian |
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89 | |||
2308 | hidnplayr | 90 | ntohd [edx + TCP_header.SequenceNumber] |
91 | ntohd [edx + TCP_header.AckNumber] |
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1733 | hidnplayr | 92 | |
2308 | hidnplayr | 93 | ntohw [edx + TCP_header.Window] |
94 | ntohw [edx + TCP_header.UrgentPointer] |
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95 | ntohw [edx + TCP_header.SourcePort] |
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96 | ntohw [edx + TCP_header.DestinationPort] |
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1733 | hidnplayr | 97 | |
98 | ;------------------------------------------------------------ |
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1831 | hidnplayr | 99 | ; Next thing to do is find the TCPS (thus, the socket pointer) |
1733 | hidnplayr | 100 | |
101 | ; IP Packet TCP Destination Port = local Port |
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102 | ; (IP Packet SenderAddress = Remote IP) OR (Remote IP = 0) |
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2309 | hidnplayr | 103 | ; (IP Packet TCP Source Port = remote Port) OR (remote Port = 0) |
1733 | hidnplayr | 104 | |
2308 | hidnplayr | 105 | mov ebx, net_sockets |
2309 | hidnplayr | 106 | mov si, [edx + TCP_header.DestinationPort] |
1733 | hidnplayr | 107 | |
108 | .socket_loop: |
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2308 | hidnplayr | 109 | mov ebx, [ebx + SOCKET.NextPtr] |
110 | or ebx, ebx |
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111 | jz .drop_with_reset_not_locked |
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1733 | hidnplayr | 112 | |
2308 | hidnplayr | 113 | cmp [ebx + SOCKET.Domain], AF_INET4 |
114 | jne .socket_loop |
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1733 | hidnplayr | 115 | |
2308 | hidnplayr | 116 | cmp [ebx + SOCKET.Protocol], IP_PROTO_TCP |
117 | jne .socket_loop |
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1733 | hidnplayr | 118 | |
2309 | hidnplayr | 119 | cmp [ebx + TCP_SOCKET.LocalPort], si |
2308 | hidnplayr | 120 | jne .socket_loop |
1733 | hidnplayr | 121 | |
2308 | hidnplayr | 122 | mov eax, [ebx + IP_SOCKET.RemoteIP] |
123 | cmp eax, [edi] ; Ipv4 source addres |
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124 | je @f |
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125 | test eax, eax |
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126 | jnz .socket_loop |
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1733 | hidnplayr | 127 | @@: |
128 | |||
2308 | hidnplayr | 129 | mov ax, [ebx + TCP_SOCKET.RemotePort] |
130 | cmp [edx + TCP_header.SourcePort] , ax |
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131 | je .found_socket |
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132 | test ax, ax |
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133 | jnz .socket_loop |
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2309 | hidnplayr | 134 | .found_socket: ; ebx now contains the socketpointer |
2308 | hidnplayr | 135 | DEBUGF 1,"Socket ptr: %x\n", ebx |
1733 | hidnplayr | 136 | |
137 | |||
138 | ;---------------------------- |
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139 | ; Check if socket isnt closed |
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140 | |||
2308 | hidnplayr | 141 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
142 | je .drop_not_locked |
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1733 | hidnplayr | 143 | |
144 | ;---------------- |
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145 | ; Lock the socket |
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146 | |||
2308 | hidnplayr | 147 | cmp [ebx + SOCKET.lock], 0 |
148 | jne .drop_not_locked ;;; HACK ! HACK ! dirty fucking HACK ! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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1830 | hidnplayr | 149 | |
2308 | hidnplayr | 150 | add ebx, SOCKET.lock |
151 | DEBUGF 1,"lock: %x\n", [ebx] |
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152 | call wait_mutex |
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153 | sub ebx, SOCKET.lock |
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1733 | hidnplayr | 154 | |
2308 | hidnplayr | 155 | DEBUGF 1,"Socket locked\n" |
1733 | hidnplayr | 156 | |
157 | ;--------------------------------------- |
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158 | ; unscale the window into a 32 bit value |
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159 | |||
2308 | hidnplayr | 160 | movzx eax, [edx + TCP_header.Window] |
161 | push ecx |
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162 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
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163 | shl eax, cl |
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164 | mov dword [edx + TCP_header.Window], eax ; word after window is checksum, we dont need checksum anymore |
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165 | pop ecx |
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1733 | hidnplayr | 166 | |
167 | ;----------------------------------- |
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168 | ; Is this socket a listening socket? |
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169 | |||
2308 | hidnplayr | 170 | test [ebx + SOCKET.options], SO_ACCEPTCON |
171 | jz .no_listening_socket |
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1733 | hidnplayr | 172 | |
2308 | hidnplayr | 173 | DEBUGF 1,"Accepting new connection\n" |
1838 | hidnplayr | 174 | |
2308 | hidnplayr | 175 | mov [ebx + SOCKET.lock], 0 |
176 | call SOCKET_fork |
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1838 | hidnplayr | 177 | |
2308 | hidnplayr | 178 | test eax, eax |
179 | jz .drop |
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1733 | hidnplayr | 180 | |
2308 | hidnplayr | 181 | push dword [edi + 4] ; Ipv4 destination addres |
182 | pop [eax + IP_SOCKET.LocalIP] |
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1733 | hidnplayr | 183 | |
2308 | hidnplayr | 184 | push [edx + TCP_header.DestinationPort] |
185 | pop [eax + TCP_SOCKET.LocalPort] |
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1733 | hidnplayr | 186 | |
2308 | hidnplayr | 187 | mov [eax + TCP_SOCKET.t_state], TCPS_LISTEN |
1733 | hidnplayr | 188 | |
1838 | hidnplayr | 189 | ; mov [ebx + SOCKET.lock], 0 |
2308 | hidnplayr | 190 | mov ebx, eax |
1733 | hidnplayr | 191 | |
2308 | hidnplayr | 192 | jmp .LISTEN |
1838 | hidnplayr | 193 | |
1733 | hidnplayr | 194 | .no_listening_socket: |
195 | |||
196 | ;------------------------------------- |
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197 | ; Reset idle timer and keepalive timer |
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198 | |||
2308 | hidnplayr | 199 | mov [ebx + TCP_SOCKET.t_idle], 0 |
200 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval |
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1733 | hidnplayr | 201 | |
202 | ;-------------------- |
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203 | ; Process TCP options |
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204 | |||
2309 | hidnplayr | 205 | mov eax, [edx + TCP_header.DataOffset] |
206 | cmp eax, TCP_header.DataOffset ; Does header contain any options? |
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2308 | hidnplayr | 207 | je .no_options |
1733 | hidnplayr | 208 | |
2308 | hidnplayr | 209 | DEBUGF 1,"Segment has options\n" |
1733 | hidnplayr | 210 | |
2308 | hidnplayr | 211 | cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN ; no options when in listen state |
212 | jz .not_uni_xfer ; also no header prediction |
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1733 | hidnplayr | 213 | |
2309 | hidnplayr | 214 | add eax, edx |
2308 | hidnplayr | 215 | lea esi, [edx + sizeof.TCP_header] |
1733 | hidnplayr | 216 | |
217 | .opt_loop: |
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2308 | hidnplayr | 218 | cmp esi, eax ; are we scanning outside of header? |
219 | jae .no_options |
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1733 | hidnplayr | 220 | |
2308 | hidnplayr | 221 | cmp byte [esi], TCP_OPT_EOL ; end of option list? |
222 | jz .no_options |
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1733 | hidnplayr | 223 | |
2308 | hidnplayr | 224 | cmp byte [esi], TCP_OPT_NOP ; nop ? |
225 | jz .opt_nop |
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1733 | hidnplayr | 226 | |
2308 | hidnplayr | 227 | cmp byte [esi], TCP_OPT_MAXSEG |
228 | je .opt_maxseg |
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1733 | hidnplayr | 229 | |
2308 | hidnplayr | 230 | cmp byte [esi], TCP_OPT_WINDOW |
231 | je .opt_window |
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1733 | hidnplayr | 232 | |
2308 | hidnplayr | 233 | cmp byte [esi], TCP_OPT_TIMESTAMP |
234 | je .opt_timestamp |
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1733 | hidnplayr | 235 | |
2308 | hidnplayr | 236 | jmp .no_options ; If we reach here, some unknown options were received, skip them all! |
1733 | hidnplayr | 237 | |
238 | .opt_nop: |
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2308 | hidnplayr | 239 | inc edi |
240 | jmp .opt_loop |
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1733 | hidnplayr | 241 | |
242 | .opt_maxseg: |
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2308 | hidnplayr | 243 | cmp byte [esi+1], 4 |
244 | jne .no_options ; error occured, ignore all options! |
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1733 | hidnplayr | 245 | |
2308 | hidnplayr | 246 | test [edx + TCP_header.Flags], TH_SYN |
247 | jz @f |
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1733 | hidnplayr | 248 | |
2308 | hidnplayr | 249 | movzx eax, word[esi+2] |
250 | rol ax, 8 |
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251 | DEBUGF 1,"Maxseg: %u\n", ax |
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1733 | hidnplayr | 252 | |
2308 | hidnplayr | 253 | mov [ebx + TCP_SOCKET.t_maxseg], eax |
1733 | hidnplayr | 254 | |
255 | @@: |
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2308 | hidnplayr | 256 | add edi, 4 |
257 | jmp .opt_loop |
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1733 | hidnplayr | 258 | |
259 | |||
260 | .opt_window: |
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2308 | hidnplayr | 261 | cmp byte [esi+1], 3 |
262 | jne .no_options |
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1733 | hidnplayr | 263 | |
2308 | hidnplayr | 264 | test [edx + TCP_header.Flags], TH_SYN |
265 | jz @f |
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1733 | hidnplayr | 266 | |
2308 | hidnplayr | 267 | DEBUGF 1,"Got window option\n" |
1733 | hidnplayr | 268 | |
2308 | hidnplayr | 269 | ;;;;; |
1733 | hidnplayr | 270 | @@: |
2308 | hidnplayr | 271 | add edi, 3 |
272 | jmp .opt_loop |
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1733 | hidnplayr | 273 | |
274 | |||
275 | .opt_timestamp: |
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2308 | hidnplayr | 276 | cmp byte [esi+1], 10 |
277 | jne .no_options |
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1733 | hidnplayr | 278 | |
2308 | hidnplayr | 279 | DEBUGF 1,"Got timestamp option\n" |
1733 | hidnplayr | 280 | |
2308 | hidnplayr | 281 | ;;;;; |
1733 | hidnplayr | 282 | |
2308 | hidnplayr | 283 | add esi, 10 |
284 | jmp .opt_loop |
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1733 | hidnplayr | 285 | |
286 | .no_options: |
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287 | |||
288 | |||
289 | |||
290 | |||
291 | |||
292 | |||
293 | ;----------------------------------------------------------------------- |
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294 | ; Time to do some header prediction (Original Principle by Van Jacobson) |
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295 | |||
296 | ; There are two common cases for an uni-directional data transfer. |
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297 | ; |
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298 | ; General rule: the packets has no control flags, is in-sequence, |
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299 | ; window width didnt change and we're not retransmitting. |
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300 | ; |
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301 | ; Second rules: |
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302 | ; - If the length is 0 and the ACK moved forward, we're the sender side of the transfer. |
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303 | ; 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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304 | ; |
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305 | ; - If the length is not 0 and the ACK didn't move, we're the receiver side of the transfer. |
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306 | ; 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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307 | |||
2308 | hidnplayr | 308 | cmp [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
309 | jnz .not_uni_xfer |
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1733 | hidnplayr | 310 | |
2308 | hidnplayr | 311 | test [edx + TCP_header.Flags], TH_SYN + TH_FIN + TH_RST + TH_URG |
312 | jnz .not_uni_xfer |
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1733 | hidnplayr | 313 | |
2308 | hidnplayr | 314 | test [edx + TCP_header.Flags], TH_ACK |
315 | jz .not_uni_xfer |
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1733 | hidnplayr | 316 | |
2308 | hidnplayr | 317 | mov eax, [edx + TCP_header.SequenceNumber] |
318 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
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319 | jne .not_uni_xfer |
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1733 | hidnplayr | 320 | |
2308 | hidnplayr | 321 | mov eax, dword [edx + TCP_header.Window] |
322 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
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323 | jne .not_uni_xfer |
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1733 | hidnplayr | 324 | |
2308 | hidnplayr | 325 | mov eax, [ebx + TCP_SOCKET.SND_NXT] |
326 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
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327 | jne .not_uni_xfer |
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1733 | hidnplayr | 328 | |
329 | ;--------------------------------------- |
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330 | ; check if we are sender in the uni-xfer |
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331 | |||
332 | ; If the following 4 conditions are all true, this segment is a pure ACK. |
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333 | ; |
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334 | ; - The segment contains no data. |
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2308 | hidnplayr | 335 | test ecx, ecx |
336 | jnz .not_sender |
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1733 | hidnplayr | 337 | |
338 | ; - The congestion window is greater than or equal to the current send window. |
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339 | ; This test is true only if the window is fully open, that is, the connection is not in the middle of slow start or congestion avoidance. |
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2308 | hidnplayr | 340 | mov eax, [ebx + TCP_SOCKET.SND_CWND] |
341 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
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342 | jb .not_uni_xfer |
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1733 | hidnplayr | 343 | |
344 | ; - The acknowledgment field in the segment is less than or equal to the maximum sequence number sent. |
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2308 | hidnplayr | 345 | mov eax, [edx + TCP_header.AckNumber] |
346 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
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347 | ja .not_uni_xfer |
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1733 | hidnplayr | 348 | |
349 | ; - The acknowledgment field in the segment is greater than the largest unacknowledged sequence number. |
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2308 | hidnplayr | 350 | sub eax, [ebx + TCP_SOCKET.SND_UNA] |
351 | jbe .not_uni_xfer |
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1733 | hidnplayr | 352 | |
2308 | hidnplayr | 353 | DEBUGF 1,"Header prediction: we are sender\n" |
1733 | hidnplayr | 354 | |
355 | ;--------------------------------- |
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356 | ; Packet is a pure ACK, process it |
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357 | |||
358 | ; Update RTT estimators |
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359 | |||
1763 | hidnplayr | 360 | ;;; TODO |
361 | |||
1733 | hidnplayr | 362 | ; Delete acknowledged bytes from send buffer |
2308 | hidnplayr | 363 | pusha |
364 | mov ecx, eax |
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365 | lea eax, [ebx + STREAM_SOCKET.snd] |
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366 | call SOCKET_ring_free |
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367 | popa |
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1733 | hidnplayr | 368 | |
369 | ; update window pointers |
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2308 | hidnplayr | 370 | mov eax, [edx + TCP_header.AckNumber] |
371 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
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1733 | hidnplayr | 372 | |
373 | ; Stop retransmit timer |
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2308 | hidnplayr | 374 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 |
1733 | hidnplayr | 375 | |
376 | ; Awaken waiting processes |
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2308 | hidnplayr | 377 | mov [ebx + SOCKET.lock], 0 |
378 | mov eax, ebx |
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379 | call SOCKET_notify_owner |
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1733 | hidnplayr | 380 | |
1763 | hidnplayr | 381 | ; Generate more output |
2308 | hidnplayr | 382 | call TCP_output |
1733 | hidnplayr | 383 | |
2308 | hidnplayr | 384 | jmp .drop_not_locked |
1763 | hidnplayr | 385 | |
1733 | hidnplayr | 386 | ;------------------------------------------------- |
387 | ; maybe we are the receiver in the uni-xfer then.. |
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388 | |||
389 | .not_sender: |
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390 | ; - The amount of data in the segment is greater than 0 (data count is in ecx) |
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391 | |||
392 | ; - The acknowledgment field equals the largest unacknowledged sequence number. This means no data is acknowledged by this segment. |
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2308 | hidnplayr | 393 | mov eax, [edx + TCP_header.AckNumber] |
394 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
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395 | jne .not_uni_xfer |
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1733 | hidnplayr | 396 | |
397 | ; - The reassembly list of out-of-order segments for the connection is empty (seg_next equals tp). |
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398 | |||
399 | ;;; TODO |
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400 | |||
2308 | hidnplayr | 401 | jnz .not_uni_xfer |
1733 | hidnplayr | 402 | |
403 | ; Complete processing of received data |
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404 | |||
2308 | hidnplayr | 405 | DEBUGF 1,"header prediction: we are receiver\nreceiving %u bytes of data\n", ecx |
1733 | hidnplayr | 406 | |
2308 | hidnplayr | 407 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
1763 | hidnplayr | 408 | |
2308 | hidnplayr | 409 | movzx esi, [edx + TCP_header.DataOffset] |
410 | add esi, edx |
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411 | lea eax, [ebx + STREAM_SOCKET.rcv] |
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412 | call SOCKET_ring_write ; Add the data to the socket buffer |
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1733 | hidnplayr | 413 | |
2308 | hidnplayr | 414 | mov eax, ebx |
415 | call SOCKET_notify_owner |
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1733 | hidnplayr | 416 | |
2308 | hidnplayr | 417 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK ; Set delayed ack flag |
1733 | hidnplayr | 418 | |
2308 | hidnplayr | 419 | jmp .drop |
1733 | hidnplayr | 420 | |
421 | |||
422 | |||
423 | |||
424 | |||
425 | |||
426 | ;-------------------------------------------------- |
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427 | ; Header prediction failed, do it the slow way |
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428 | |||
429 | .not_uni_xfer: |
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430 | |||
2308 | hidnplayr | 431 | DEBUGF 1,"Header prediction failed\n" |
1733 | hidnplayr | 432 | |
433 | ; Calculate receive window size |
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434 | |||
2305 | hidnplayr | 435 | ; mov eax, [ebx + STREAM_SOCKET.rcv + RING_BUFFER.size] |
436 | ; neg eax |
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437 | ; add eax, SOCKETBUFFSIZE |
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438 | ; mov edx, [ebx + TCP_SOCKET.RCV_ADV] |
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439 | ; sub edx, [ebx + TCP_SOCKET.RCV_NXT] |
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440 | ; cmp eax, edx |
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441 | ; jae @f |
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442 | ; mov eax, edx |
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443 | ; @@: |
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1733 | hidnplayr | 444 | |
2308 | hidnplayr | 445 | cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN |
446 | je .LISTEN |
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1733 | hidnplayr | 447 | |
2308 | hidnplayr | 448 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_SENT |
449 | je .SYN_SENT |
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1733 | hidnplayr | 450 | |
2308 | hidnplayr | 451 | jmp .NOT_LISTEN_OR_SYN_SENT |
1733 | hidnplayr | 452 | |
453 | |||
454 | |||
455 | ;------------- |
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456 | ; Passive Open |
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457 | |||
458 | align 4 |
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459 | .LISTEN: |
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460 | |||
2308 | hidnplayr | 461 | DEBUGF 1,"TCP state: listen\n" |
1733 | hidnplayr | 462 | |
2308 | hidnplayr | 463 | test [edx + TCP_header.Flags], TH_RST ;;; TODO: kill new socket on error |
464 | jnz .drop |
||
1733 | hidnplayr | 465 | |
2308 | hidnplayr | 466 | test [edx + TCP_header.Flags], TH_ACK |
467 | jnz .drop_with_reset |
||
1733 | hidnplayr | 468 | |
2308 | hidnplayr | 469 | test [edx + TCP_header.Flags], TH_SYN |
470 | jz .drop |
||
1733 | hidnplayr | 471 | |
472 | ;;; TODO: check if it's a broadcast or multicast, and drop if so |
||
473 | |||
2308 | hidnplayr | 474 | push dword [edi + 4] ; Ipv4 destination addres |
475 | pop [ebx + IP_SOCKET.RemoteIP] |
||
1733 | hidnplayr | 476 | |
2308 | hidnplayr | 477 | push [edx + TCP_header.SourcePort] |
478 | pop [ebx + TCP_SOCKET.RemotePort] |
||
1733 | hidnplayr | 479 | |
2308 | hidnplayr | 480 | push [edx + TCP_header.SequenceNumber] |
481 | pop [ebx + TCP_SOCKET.IRS] |
||
1733 | hidnplayr | 482 | |
2308 | hidnplayr | 483 | push [TCP_sequence_num] ;;;;; |
484 | add [TCP_sequence_num], 64000 / 2 |
||
485 | pop [ebx + TCP_SOCKET.ISS] |
||
1733 | hidnplayr | 486 | |
2308 | hidnplayr | 487 | push [ebx + TCP_SOCKET.ISS] |
488 | pop [ebx + TCP_SOCKET.SND_NXT] |
||
1733 | hidnplayr | 489 | |
2308 | hidnplayr | 490 | TCP_sendseqinit ebx |
491 | TCP_rcvseqinit ebx |
||
1733 | hidnplayr | 492 | |
2308 | hidnplayr | 493 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
494 | mov [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
495 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval ;;;; macro |
||
1838 | hidnplayr | 496 | |
2308 | hidnplayr | 497 | lea eax, [ebx + STREAM_SOCKET.snd] |
498 | call SOCKET_ring_create |
||
1733 | hidnplayr | 499 | |
2308 | hidnplayr | 500 | lea eax, [ebx + STREAM_SOCKET.rcv] |
501 | call SOCKET_ring_create |
||
1733 | hidnplayr | 502 | |
1838 | hidnplayr | 503 | ;;; call SOCKET_notify_owner |
1733 | hidnplayr | 504 | |
2308 | hidnplayr | 505 | jmp .trim_then_step6 |
506 | |||
1733 | hidnplayr | 507 | |
508 | |||
509 | |||
510 | |||
511 | |||
512 | |||
513 | |||
514 | |||
1838 | hidnplayr | 515 | |
1733 | hidnplayr | 516 | ;------------ |
517 | ; Active Open |
||
518 | |||
519 | align 4 |
||
520 | .SYN_SENT: |
||
521 | |||
2308 | hidnplayr | 522 | DEBUGF 1,"TCP state: syn_sent\n" |
1733 | hidnplayr | 523 | |
2308 | hidnplayr | 524 | test [edx + TCP_header.Flags], TH_ACK |
525 | jz @f |
||
1733 | hidnplayr | 526 | |
2308 | hidnplayr | 527 | mov eax, [edx + TCP_header.AckNumber] |
528 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
529 | jbe .drop_with_reset |
||
1733 | hidnplayr | 530 | |
2308 | hidnplayr | 531 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
532 | ja .drop_with_reset |
||
1733 | hidnplayr | 533 | @@: |
534 | |||
2308 | hidnplayr | 535 | test [edx + TCP_header.Flags], TH_RST |
536 | jz @f |
||
1733 | hidnplayr | 537 | |
2308 | hidnplayr | 538 | test [edx + TCP_header.Flags], TH_ACK |
539 | jz .drop |
||
1733 | hidnplayr | 540 | |
2308 | hidnplayr | 541 | mov eax, ebx |
542 | mov ebx, ECONNREFUSED |
||
543 | call TCP_drop |
||
1733 | hidnplayr | 544 | |
2308 | hidnplayr | 545 | jmp .drop |
1733 | hidnplayr | 546 | @@: |
547 | |||
2308 | hidnplayr | 548 | test [edx + TCP_header.Flags], TH_SYN |
549 | jz .drop |
||
1733 | hidnplayr | 550 | |
551 | ; at this point, segment seems to be valid |
||
552 | |||
2308 | hidnplayr | 553 | test [edx + TCP_header.Flags], TH_ACK |
554 | jz .no_syn_ack |
||
1733 | hidnplayr | 555 | |
556 | ; now, process received SYN in response to an active open |
||
557 | |||
2308 | hidnplayr | 558 | mov eax, [edx + TCP_header.AckNumber] |
559 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
560 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
561 | jbe @f |
||
562 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1733 | hidnplayr | 563 | @@: |
564 | |||
565 | .no_syn_ack: |
||
566 | |||
2308 | hidnplayr | 567 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 ; disable retransmission |
1733 | hidnplayr | 568 | |
2308 | hidnplayr | 569 | push [edx + TCP_header.SequenceNumber] |
570 | pop [ebx + TCP_SOCKET.IRS] |
||
1733 | hidnplayr | 571 | |
2308 | hidnplayr | 572 | TCP_rcvseqinit ebx |
1733 | hidnplayr | 573 | |
2308 | hidnplayr | 574 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1733 | hidnplayr | 575 | |
2308 | hidnplayr | 576 | mov eax, [ebx + TCP_SOCKET.SND_UNA] |
577 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
578 | jbe .simultaneous_open |
||
1733 | hidnplayr | 579 | |
2308 | hidnplayr | 580 | test [edx + TCP_header.Flags], TH_ACK |
581 | jz .simultaneous_open |
||
1733 | hidnplayr | 582 | |
2308 | hidnplayr | 583 | DEBUGF 1,"TCP: active open\n" |
1733 | hidnplayr | 584 | |
585 | ;;; TODO: update stats |
||
586 | |||
587 | ; set socket state to connected |
||
588 | |||
2308 | hidnplayr | 589 | mov [ebx + SOCKET.state],1 ;;;; FIXME |
1733 | hidnplayr | 590 | |
2308 | hidnplayr | 591 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
1733 | hidnplayr | 592 | |
593 | ;;; TODO: check if we should scale the connection (567-572) |
||
594 | ;;; TODO: update RTT estimators |
||
595 | |||
2308 | hidnplayr | 596 | jmp .trim_then_step6 |
1733 | hidnplayr | 597 | |
598 | .simultaneous_open: |
||
599 | |||
2308 | hidnplayr | 600 | DEBUGF 1,"TCP: simultaneous open\n" |
1733 | hidnplayr | 601 | ; We have received a syn but no ACK, so we are having a simultaneous open.. |
2308 | hidnplayr | 602 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
1733 | hidnplayr | 603 | |
604 | |||
605 | |||
606 | |||
607 | |||
608 | |||
609 | |||
610 | ;------------------------------------- |
||
611 | ; Common processing for receipt of SYN |
||
612 | |||
613 | .trim_then_step6: |
||
614 | |||
2308 | hidnplayr | 615 | inc [edx + TCP_header.SequenceNumber] |
1733 | hidnplayr | 616 | |
617 | ;;; TODO: Drop any received data that follows receive window (590) |
||
618 | |||
2308 | hidnplayr | 619 | mov eax, [edx + TCP_header.SequenceNumber] |
620 | mov [ebx + TCP_SOCKET.RCV_UP], eax |
||
621 | dec eax |
||
622 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
1733 | hidnplayr | 623 | |
2308 | hidnplayr | 624 | jmp .ack_processed |
1733 | hidnplayr | 625 | |
626 | |||
627 | |||
628 | |||
629 | |||
630 | |||
631 | |||
632 | |||
633 | .NOT_LISTEN_OR_SYN_SENT: |
||
634 | |||
2308 | hidnplayr | 635 | DEBUGF 1,"Slow TCP input: not listen or syn_sent state\n" |
1733 | hidnplayr | 636 | |
637 | ;-------------------------------------------- |
||
638 | ; Protection Against Wrapped Sequence Numbers |
||
639 | |||
640 | ; First, check if timestamp is present |
||
641 | |||
1763 | hidnplayr | 642 | ;;;; TODO 602 |
1733 | hidnplayr | 643 | |
644 | ; Then, check if at least some bytes of data are within window |
||
645 | |||
646 | ;;;; TODO |
||
647 | |||
648 | |||
649 | |||
650 | |||
651 | |||
652 | |||
653 | |||
654 | |||
655 | ;---------------------------- |
||
656 | ; trim any data not in window |
||
657 | |||
658 | ; check for duplicate data at beginning of segment |
||
659 | |||
2308 | hidnplayr | 660 | mov eax, [ebx + TCP_SOCKET.RCV_NXT] |
661 | sub eax, [edx + TCP_header.SequenceNumber] |
||
662 | jbe .no_duplicate |
||
1733 | hidnplayr | 663 | |
2308 | hidnplayr | 664 | DEBUGF 1,"Uh oh.. %u bytes of duplicate data!\n", eax |
1763 | hidnplayr | 665 | |
2308 | hidnplayr | 666 | test [edx + TCP_header.Flags], TH_SYN |
667 | jz .no_dup_syn |
||
1733 | hidnplayr | 668 | |
669 | ; remove duplicate syn |
||
670 | |||
2308 | hidnplayr | 671 | and [edx + TCP_header.Flags], not (TH_SYN) |
672 | inc [edx + TCP_header.SequenceNumber] |
||
1733 | hidnplayr | 673 | |
2308 | hidnplayr | 674 | cmp [edx + TCP_header.UrgentPointer], 1 |
675 | jbe @f |
||
676 | dec [edx + TCP_header.UrgentPointer] |
||
677 | jmp .dup_syn |
||
1733 | hidnplayr | 678 | @@: |
2308 | hidnplayr | 679 | and [edx + TCP_header.Flags], not (TH_URG) |
1838 | hidnplayr | 680 | .dup_syn: |
2308 | hidnplayr | 681 | dec eax |
1763 | hidnplayr | 682 | .no_dup_syn: |
1733 | hidnplayr | 683 | |
684 | ; eax holds number of bytes to drop |
||
685 | |||
686 | ; Check for entire duplicate packet |
||
687 | |||
2308 | hidnplayr | 688 | cmp eax, ecx |
689 | jae .duplicate |
||
1733 | hidnplayr | 690 | |
2308 | hidnplayr | 691 | DEBUGF 1,"Going to drop %u out of %u bytes\n", eax, ecx |
1830 | hidnplayr | 692 | |
1733 | hidnplayr | 693 | ;;; TODO: apply figure 28.30 |
694 | |||
695 | ; Check for duplicate FIN |
||
696 | |||
2308 | hidnplayr | 697 | test [edx + TCP_header.Flags], TH_FIN |
698 | jz @f |
||
699 | inc ecx |
||
700 | cmp eax, ecx |
||
701 | dec ecx |
||
702 | jne @f |
||
1733 | hidnplayr | 703 | |
2308 | hidnplayr | 704 | mov eax, ecx |
705 | and [edx + TCP_header.Flags], not TH_FIN |
||
706 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
707 | jmp .no_duplicate |
||
1733 | hidnplayr | 708 | @@: |
709 | |||
710 | ; Handle the case when a bound socket connects to itself |
||
711 | ; Allow packets with a SYN and an ACKto continue with the processing |
||
712 | |||
713 | ;------------------------------------- |
||
714 | ; Generate duplicate ACK if nescessary |
||
715 | |||
716 | ; This code also handles simultaneous half-open or self-connects |
||
717 | |||
2308 | hidnplayr | 718 | test eax, eax |
719 | jnz .drop_after_ack |
||
1733 | hidnplayr | 720 | |
2308 | hidnplayr | 721 | cmp [edx + TCP_header.Flags], TH_ACK |
722 | jz .drop_after_ack |
||
1733 | hidnplayr | 723 | |
724 | .duplicate: |
||
725 | |||
2308 | hidnplayr | 726 | DEBUGF 1,"Duplicate received\n" |
1733 | hidnplayr | 727 | |
728 | ;---------------------------------------- |
||
729 | ; Update statistics for duplicate packets |
||
730 | |||
731 | ;;; TODO |
||
732 | |||
2308 | hidnplayr | 733 | jmp .drop_after_ack |
1733 | hidnplayr | 734 | |
735 | .no_duplicate: |
||
736 | |||
737 | ;----------------------------------------------- |
||
738 | ; Remove duplicate data and update urgent offset |
||
739 | |||
2308 | hidnplayr | 740 | add [edx + TCP_header.SequenceNumber], eax |
1733 | hidnplayr | 741 | |
742 | ;;; TODO |
||
743 | |||
2308 | hidnplayr | 744 | sub [edx + TCP_header.UrgentPointer], ax |
745 | ja @f |
||
1733 | hidnplayr | 746 | |
2308 | hidnplayr | 747 | and [edx + TCP_header.Flags], not (TH_URG) |
748 | mov [edx + TCP_header.UrgentPointer], 0 |
||
1733 | hidnplayr | 749 | @@: |
750 | |||
751 | ;-------------------------------------------------- |
||
752 | ; Handle data that arrives after process terminates |
||
753 | |||
2308 | hidnplayr | 754 | cmp [ebx + SOCKET.PID], 0 |
755 | ja @f |
||
1733 | hidnplayr | 756 | |
2308 | hidnplayr | 757 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
758 | jbe @f |
||
1733 | hidnplayr | 759 | |
2308 | hidnplayr | 760 | test ecx, ecx |
761 | jz @f |
||
1733 | hidnplayr | 762 | |
763 | ;;; Close the socket |
||
764 | ;;; update stats |
||
765 | |||
2308 | hidnplayr | 766 | jmp .drop_with_reset |
1733 | hidnplayr | 767 | @@: |
768 | |||
769 | ;---------------------------------------- |
||
770 | ; Remove data beyond right edge of window |
||
771 | |||
2308 | hidnplayr | 772 | mov eax, [edx + TCP_header.SequenceNumber] |
773 | add eax, ecx |
||
774 | sub eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
775 | sub ax, [ebx + TCP_SOCKET.RCV_WND] |
||
1733 | hidnplayr | 776 | |
777 | ; eax now holds the number of bytes to drop |
||
778 | |||
2308 | hidnplayr | 779 | jbe .no_excess_data |
1733 | hidnplayr | 780 | |
781 | ;;; TODO: update stats |
||
782 | |||
2308 | hidnplayr | 783 | cmp eax, ecx |
784 | jb .dont_drop_all |
||
1733 | hidnplayr | 785 | |
786 | ;;; TODO 700-736 |
||
787 | |||
788 | .dont_drop_all: |
||
789 | |||
790 | .no_excess_data: |
||
791 | |||
792 | |||
793 | |||
794 | |||
795 | |||
796 | |||
797 | |||
798 | |||
799 | ;----------------- |
||
800 | ; Record timestamp |
||
801 | |||
802 | ;;; TODO 737-746 |
||
803 | |||
804 | |||
805 | |||
806 | |||
807 | |||
808 | ;------------------ |
||
809 | ; Process RST flags |
||
810 | |||
2308 | hidnplayr | 811 | test [edx + TCP_header.Flags], TH_RST |
812 | jz .rst_skip |
||
1733 | hidnplayr | 813 | |
2308 | hidnplayr | 814 | DEBUGF 1,"Got an RST flag" |
1733 | hidnplayr | 815 | |
2308 | hidnplayr | 816 | mov eax, [ebx + TCP_SOCKET.t_state] |
817 | shl eax, 2 |
||
818 | jmp dword [eax + .rst_sw_list] |
||
1733 | hidnplayr | 819 | |
820 | .rst_sw_list: |
||
2308 | hidnplayr | 821 | dd .rst_skip ;TCPS_CLOSED |
822 | dd .rst_skip ;TCPS_LISTEN |
||
823 | dd .rst_skip ;TCPS_SYN_SENT |
||
824 | dd .econnrefused ;TCPS_SYN_RECEIVED |
||
825 | dd .econnreset ;TCPS_ESTABLISHED |
||
826 | dd .econnreset ;TCPS_CLOSE_WAIT |
||
827 | dd .econnreset ;TCPS_FIN_WAIT_1 |
||
828 | dd .rst_close ;TCPS_CLOSING |
||
829 | dd .rst_close ;TCPS_LAST_ACK |
||
830 | dd .econnreset ;TCPS_FIN_WAIT_2 |
||
831 | dd .rst_close ;TCPS_TIMED_WAIT |
||
1733 | hidnplayr | 832 | |
833 | .econnrefused: |
||
2308 | hidnplayr | 834 | DEBUGF 1,"Connection refused" |
1733 | hidnplayr | 835 | |
2308 | hidnplayr | 836 | mov [ebx + SOCKET.errorcode], ECONNREFUSED |
837 | jmp .close |
||
1733 | hidnplayr | 838 | |
839 | .econnreset: |
||
2308 | hidnplayr | 840 | DEBUGF 1,"Connection reset" |
1733 | hidnplayr | 841 | |
2308 | hidnplayr | 842 | mov [ebx + SOCKET.errorcode], ECONNRESET |
1733 | hidnplayr | 843 | |
1831 | hidnplayr | 844 | .close: |
2308 | hidnplayr | 845 | DEBUGF 1,"Closing connection" |
1733 | hidnplayr | 846 | |
2308 | hidnplayr | 847 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
848 | ;;; TODO: update stats |
||
849 | mov eax, ebx |
||
850 | call TCP_close |
||
851 | jmp .drop |
||
1733 | hidnplayr | 852 | |
853 | .rst_close: |
||
2308 | hidnplayr | 854 | DEBUGF 1,"Closing with reset\n" |
1733 | hidnplayr | 855 | |
2308 | hidnplayr | 856 | mov eax, ebx |
857 | call TCP_close |
||
858 | jmp .drop |
||
1733 | hidnplayr | 859 | |
860 | |||
861 | |||
862 | |||
863 | |||
864 | |||
865 | |||
1763 | hidnplayr | 866 | .rst_skip: |
1733 | hidnplayr | 867 | |
1763 | hidnplayr | 868 | |
1733 | hidnplayr | 869 | ;-------------------------------------- |
870 | ; handle SYN-full and ACK-less segments |
||
871 | |||
2308 | hidnplayr | 872 | test [edx + TCP_header.Flags], TH_SYN |
873 | jz @f |
||
1733 | hidnplayr | 874 | |
2308 | hidnplayr | 875 | mov eax, ebx |
876 | mov ebx, ECONNRESET |
||
877 | call TCP_drop |
||
878 | jmp .drop_with_reset |
||
1733 | hidnplayr | 879 | |
2308 | hidnplayr | 880 | test [edx + TCP_header.Flags], TH_ACK |
881 | jz .drop |
||
1733 | hidnplayr | 882 | @@: |
883 | |||
884 | |||
885 | |||
886 | |||
887 | |||
888 | |||
889 | |||
890 | ;--------------- |
||
891 | ; ACK processing |
||
892 | |||
2308 | hidnplayr | 893 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
894 | jnz .no_syn_rcv |
||
1733 | hidnplayr | 895 | |
2308 | hidnplayr | 896 | DEBUGF 1,"TCP state = syn received\n" |
1733 | hidnplayr | 897 | |
2308 | hidnplayr | 898 | mov eax, [edx + TCP_header.AckNumber] |
899 | cmp [ebx + TCP_SOCKET.SND_UNA], eax |
||
900 | ja .drop_with_reset |
||
901 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
902 | ja .drop_with_reset |
||
1733 | hidnplayr | 903 | |
2309 | hidnplayr | 904 | ;;; TODO: update stats |
905 | |||
2308 | hidnplayr | 906 | mov eax, ebx |
907 | call SOCKET_is_connected |
||
908 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
||
1831 | hidnplayr | 909 | |
910 | ; Do window scaling? |
||
911 | |||
2308 | hidnplayr | 912 | test [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
913 | jz @f |
||
914 | test [ebx + TCP_SOCKET.t_flags], TF_REQ_SCALE |
||
915 | jz @f |
||
1831 | hidnplayr | 916 | |
2309 | hidnplayr | 917 | push word [ebx + TCP_SOCKET.requested_s_scale] ; Set send and receive scale factors to the received values |
918 | pop word [ebx + TCP_SOCKET.SND_SCALE] |
||
1831 | hidnplayr | 919 | @@: |
920 | |||
2309 | hidnplayr | 921 | ;;; TODO: copy the data (if any) into the socket |
1831 | hidnplayr | 922 | |
2308 | hidnplayr | 923 | mov eax, [edx + TCP_header.SequenceNumber] |
924 | dec eax |
||
925 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
926 | jmp .not_dup_ack |
||
1831 | hidnplayr | 927 | |
1733 | hidnplayr | 928 | .no_syn_rcv: |
929 | |||
930 | ; check for duplicate ACK |
||
931 | |||
2308 | hidnplayr | 932 | mov eax, [edx + TCP_header.AckNumber] |
933 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
934 | ja .not_dup_ack |
||
1733 | hidnplayr | 935 | |
2308 | hidnplayr | 936 | test ecx, ecx |
937 | jnz .reset_dupacks |
||
1733 | hidnplayr | 938 | |
2308 | hidnplayr | 939 | mov eax, dword [edx + TCP_header.Window] |
940 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
941 | jne .reset_dupacks |
||
1733 | hidnplayr | 942 | |
2308 | hidnplayr | 943 | DEBUGF 1,"Processing a duplicate ACK..\n" |
1733 | hidnplayr | 944 | |
2309 | hidnplayr | 945 | cmp [ebx + TCP_SOCKET.timer_retransmission], 10000 ;;;; FIXME |
2308 | hidnplayr | 946 | ja @f |
1733 | hidnplayr | 947 | |
2308 | hidnplayr | 948 | mov eax, [edx + TCP_header.AckNumber] |
949 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
950 | je .dup_ack |
||
1763 | hidnplayr | 951 | |
952 | @@: |
||
2308 | hidnplayr | 953 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
954 | jmp .not_dup_ack |
||
1763 | hidnplayr | 955 | |
956 | .dup_ack: |
||
2308 | hidnplayr | 957 | inc [ebx + TCP_SOCKET.t_dupacks] |
958 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
||
959 | jne .no_re_xmit |
||
1763 | hidnplayr | 960 | |
2308 | hidnplayr | 961 | push [ebx + TCP_SOCKET.SND_NXT] ; >>>> |
1763 | hidnplayr | 962 | |
2308 | hidnplayr | 963 | mov eax, [ebx + TCP_SOCKET.SND_WND] |
964 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
||
965 | cmovg eax, [ebx + TCP_SOCKET.SND_CWND] |
||
966 | shr eax, 1 |
||
967 | push edx |
||
968 | xor edx, edx |
||
969 | div [ebx + TCP_SOCKET.t_maxseg] |
||
970 | cmp eax, 2 |
||
971 | jae @f |
||
972 | mov ax, 2 |
||
1763 | hidnplayr | 973 | @@: |
2308 | hidnplayr | 974 | mul [ebx + TCP_SOCKET.t_maxseg] |
975 | pop edx |
||
976 | mov [ebx + TCP_SOCKET.SND_SSTHRESH], eax |
||
1763 | hidnplayr | 977 | |
2308 | hidnplayr | 978 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 ; turn off retransmission timer |
979 | mov [ebx + TCP_SOCKET.t_rtt], 0 |
||
980 | mov eax, [edx + TCP_header.AckNumber] |
||
981 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
982 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
983 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
1763 | hidnplayr | 984 | |
2308 | hidnplayr | 985 | mov eax, ebx |
986 | call TCP_output ; retransmit missing segment |
||
1763 | hidnplayr | 987 | |
2308 | hidnplayr | 988 | push edx |
989 | xor edx, edx |
||
990 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
991 | mul [ebx + TCP_SOCKET.t_dupacks] |
||
992 | pop edx |
||
993 | add eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
||
994 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
1763 | hidnplayr | 995 | |
2308 | hidnplayr | 996 | pop eax ; <<<< |
997 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
998 | jb @f |
||
999 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1763 | hidnplayr | 1000 | @@: |
1001 | |||
2308 | hidnplayr | 1002 | jmp .drop |
1733 | hidnplayr | 1003 | |
1004 | |||
1763 | hidnplayr | 1005 | .no_re_xmit: |
2308 | hidnplayr | 1006 | jbe .not_dup_ack |
1733 | hidnplayr | 1007 | |
2308 | hidnplayr | 1008 | DEBUGF 1,"Increasing congestion window\n" |
1733 | hidnplayr | 1009 | |
2308 | hidnplayr | 1010 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
1011 | add [ebx + TCP_SOCKET.SND_CWND], eax |
||
1733 | hidnplayr | 1012 | |
2308 | hidnplayr | 1013 | mov eax, ebx |
1014 | call TCP_output |
||
1733 | hidnplayr | 1015 | |
2308 | hidnplayr | 1016 | jmp .drop |
1733 | hidnplayr | 1017 | |
1018 | |||
1019 | |||
1763 | hidnplayr | 1020 | |
1021 | |||
1022 | |||
1023 | .not_dup_ack: |
||
1024 | |||
1733 | hidnplayr | 1025 | ;------------------------------------------------- |
1026 | ; If the congestion window was inflated to account |
||
1027 | ; for the other side's cached packets, retract it |
||
1028 | |||
2308 | hidnplayr | 1029 | mov eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
1030 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
||
1031 | ja @f |
||
1032 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
||
1033 | jbe @f |
||
1034 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
1763 | hidnplayr | 1035 | @@: |
1733 | hidnplayr | 1036 | |
2308 | hidnplayr | 1037 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
1733 | hidnplayr | 1038 | |
2308 | hidnplayr | 1039 | mov eax, [edx + TCP_header.AckNumber] |
1040 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
1041 | jbe @f |
||
1733 | hidnplayr | 1042 | |
2308 | hidnplayr | 1043 | ;;; TODO: update stats |
1044 | jmp .drop_after_ack |
||
1733 | hidnplayr | 1045 | |
1763 | hidnplayr | 1046 | @@: |
1733 | hidnplayr | 1047 | |
2308 | hidnplayr | 1048 | mov edi, [edx + TCP_header.AckNumber] |
1049 | sub edi, [ebx + TCP_SOCKET.SND_UNA] ; now we got the number of acked bytes in edi |
||
1733 | hidnplayr | 1050 | |
2308 | hidnplayr | 1051 | ;;; TODO: update stats |
1733 | hidnplayr | 1052 | |
1053 | |||
2308 | hidnplayr | 1054 | DEBUGF 1,"We have an acceptable ACK of %x bytes\n", esi |
1763 | hidnplayr | 1055 | |
1056 | |||
1057 | |||
1058 | |||
1059 | |||
1060 | |||
1733 | hidnplayr | 1061 | ;------------------------------------------ |
1062 | ; RTT measurements and retransmission timer |
||
1063 | |||
2308 | hidnplayr | 1064 | ;;;;; 912 - 926 |
1733 | hidnplayr | 1065 | |
2308 | hidnplayr | 1066 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 |
1733 | hidnplayr | 1067 | |
2308 | hidnplayr | 1068 | mov eax, [ebx + TCP_SOCKET.SND_MAX] |
1069 | cmp eax, [edx + TCP_header.AckNumber] |
||
1070 | je .all_outstanding |
||
1071 | mov [ebx + TCP_SOCKET.timer_retransmission], 120 ;;;; TODO: correct this value (use a macro for it) |
||
1733 | hidnplayr | 1072 | .all_outstanding: |
1073 | |||
1074 | |||
1075 | |||
1076 | |||
1077 | |||
1078 | |||
1079 | |||
1080 | ;------------------------------------------- |
||
1081 | ; Open congestion window in response to ACKs |
||
1082 | |||
2308 | hidnplayr | 1083 | mov esi, [ebx + TCP_SOCKET.SND_CWND] |
1084 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
1733 | hidnplayr | 1085 | |
2308 | hidnplayr | 1086 | cmp esi, [ebx + TCP_SOCKET.SND_SSTHRESH] |
1087 | jbe @f |
||
1088 | push edx |
||
1089 | push eax |
||
1090 | mul eax |
||
1091 | div esi |
||
1092 | pop edx |
||
1093 | shr edx, 3 |
||
1094 | add eax, edx |
||
1095 | pop edx |
||
1763 | hidnplayr | 1096 | @@: |
1733 | hidnplayr | 1097 | |
2308 | hidnplayr | 1098 | add esi, eax |
1733 | hidnplayr | 1099 | |
2308 | hidnplayr | 1100 | push ecx |
1101 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
||
1102 | mov eax, TCP_max_win |
||
1103 | shl eax, cl |
||
1104 | pop ecx |
||
1733 | hidnplayr | 1105 | |
2308 | hidnplayr | 1106 | cmp esi, eax |
1107 | cmovg esi, eax |
||
1108 | mov [ebx + TCP_SOCKET.SND_CWND], esi |
||
1733 | hidnplayr | 1109 | |
1110 | |||
1111 | |||
1112 | |||
1763 | hidnplayr | 1113 | |
1114 | |||
1115 | |||
1733 | hidnplayr | 1116 | ;------------------------------------------ |
1117 | ; Remove acknowledged data from send buffer |
||
1118 | |||
2308 | hidnplayr | 1119 | push ecx edx ebx |
1120 | mov ecx, edi |
||
1121 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1122 | call SOCKET_ring_free |
||
1123 | pop ebx |
||
1124 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
||
1125 | pop edx ecx |
||
1733 | hidnplayr | 1126 | |
1127 | ; Wake up process waiting on send buffer |
||
1128 | |||
2308 | hidnplayr | 1129 | mov eax, ebx |
1130 | call SOCKET_notify_owner |
||
1733 | hidnplayr | 1131 | |
1831 | hidnplayr | 1132 | ; Update TCPS |
1733 | hidnplayr | 1133 | |
2308 | hidnplayr | 1134 | mov eax, [edx + TCP_header.AckNumber] |
1135 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
1733 | hidnplayr | 1136 | |
2308 | hidnplayr | 1137 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
1138 | jb @f |
||
1139 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1733 | hidnplayr | 1140 | @@: |
1141 | |||
1142 | |||
2308 | hidnplayr | 1143 | ;; TODO: use zero flag as 'ourfinisacked' |
1733 | hidnplayr | 1144 | |
1145 | |||
1146 | |||
1147 | |||
1148 | ; General ACK handling complete |
||
1149 | ; Now do the state-specific ones |
||
1150 | |||
2308 | hidnplayr | 1151 | mov eax, [ebx + TCP_SOCKET.t_state] |
1152 | jmp dword [eax*4 + .ACK_sw_list] |
||
1733 | hidnplayr | 1153 | |
1154 | .ACK_sw_list: |
||
2308 | hidnplayr | 1155 | dd .ack_processed ;TCPS_CLOSED |
1156 | dd .ack_processed ;TCPS_LISTEN |
||
1157 | dd .ack_processed ;TCPS_SYN_SENT |
||
1158 | dd .ack_processed ;TCPS_SYN_RECEIVED |
||
1159 | dd .ack_processed ;TCPS_ESTABLISHED |
||
1160 | dd .ack_processed ;TCPS_CLOSE_WAIT |
||
1161 | dd .ack_fw1 ;TCPS_FIN_WAIT_1 |
||
1162 | dd .ack_c ;TCPS_CLOSING |
||
1163 | dd .ack_la ;TCPS_LAST_ACK |
||
1164 | dd .ack_processed ;TCPS_FIN_WAIT_2 |
||
1165 | dd .ack_tw ;TCPS_TIMED_WAIT |
||
1733 | hidnplayr | 1166 | |
1167 | |||
1772 | hidnplayr | 1168 | .ack_fw1: |
2308 | hidnplayr | 1169 | jz .ack_processed |
1733 | hidnplayr | 1170 | |
2308 | hidnplayr | 1171 | test [ebx + SOCKET.state], SS_CANTRCVMORE |
1172 | jnz @f |
||
1173 | mov eax, ebx |
||
1174 | call SOCKET_is_disconnected |
||
1773 | hidnplayr | 1175 | ;;; mov [ebx + TCP_SOCKET.timer_timed_wait], TCP_time_max_idle |
1772 | hidnplayr | 1176 | @@: |
1733 | hidnplayr | 1177 | |
2308 | hidnplayr | 1178 | mov [ebx + TCP_SOCKET.t_state], TCPS_FIN_WAIT_2 |
1179 | jmp .ack_processed |
||
1733 | hidnplayr | 1180 | |
1181 | |||
1772 | hidnplayr | 1182 | .ack_c: |
2308 | hidnplayr | 1183 | jz .ack_processed |
1772 | hidnplayr | 1184 | |
2308 | hidnplayr | 1185 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1186 | mov eax, ebx |
||
1187 | call TCP_cancel_timers |
||
1188 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
1189 | mov eax, ebx |
||
1190 | call SOCKET_is_disconnected |
||
1191 | jmp .ack_processed |
||
1733 | hidnplayr | 1192 | |
1193 | |||
1772 | hidnplayr | 1194 | .ack_la: |
2308 | hidnplayr | 1195 | jz .ack_processed |
1733 | hidnplayr | 1196 | |
1773 | hidnplayr | 1197 | |
2308 | hidnplayr | 1198 | mov eax, ebx |
1199 | call TCP_close |
||
1200 | jmp .drop |
||
1733 | hidnplayr | 1201 | |
1202 | |||
1772 | hidnplayr | 1203 | .ack_tw: |
2308 | hidnplayr | 1204 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
1205 | jmp .drop_after_ack |
||
1733 | hidnplayr | 1206 | |
1207 | |||
1772 | hidnplayr | 1208 | |
1209 | |||
1210 | |||
1211 | |||
1212 | |||
2308 | hidnplayr | 1213 | .reset_dupacks: ; We got a new ACK, reset duplicate ACK counter |
1733 | hidnplayr | 1214 | |
2308 | hidnplayr | 1215 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
1733 | hidnplayr | 1216 | |
2308 | hidnplayr | 1217 | .ack_processed: ; (step 6) |
1733 | hidnplayr | 1218 | |
2308 | hidnplayr | 1219 | DEBUGF 1,"ACK processed\n" |
1733 | hidnplayr | 1220 | |
1221 | ;---------------------------------------------- |
||
1222 | ; check if we need to update window information |
||
1223 | |||
2308 | hidnplayr | 1224 | test [edx + TCP_header.Flags], TH_ACK |
1225 | jz .no_window_update |
||
1733 | hidnplayr | 1226 | |
2308 | hidnplayr | 1227 | mov eax, [ebx + TCP_SOCKET.SND_WL1] |
1228 | cmp eax, [edx + TCP_header.SequenceNumber] |
||
1229 | jb .update_window |
||
1230 | ja @f |
||
1733 | hidnplayr | 1231 | |
2308 | hidnplayr | 1232 | mov eax, [ebx + TCP_SOCKET.SND_WL2] |
1233 | cmp eax, [edx + TCP_header.AckNumber] |
||
1234 | jb .update_window |
||
1235 | ja .no_window_update |
||
1733 | hidnplayr | 1236 | @@: |
1237 | |||
2308 | hidnplayr | 1238 | mov eax, [ebx + TCP_SOCKET.SND_WL2] |
1239 | cmp eax, [edx + TCP_header.AckNumber] |
||
1240 | jne .no_window_update |
||
1733 | hidnplayr | 1241 | |
2309 | hidnplayr | 1242 | mov eax, dword [edx + TCP_header.Window] |
2308 | hidnplayr | 1243 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
1244 | jbe .no_window_update |
||
1733 | hidnplayr | 1245 | |
1246 | .update_window: |
||
1247 | |||
2308 | hidnplayr | 1248 | DEBUGF 1,"Updating window\n" |
1733 | hidnplayr | 1249 | |
1250 | ; Keep track of pure window updates |
||
1251 | |||
1252 | ; test ecx, ecx |
||
1253 | ; jz @f |
||
1254 | ; |
||
1255 | ; mov eax, [ebx + TCP_SOCKET.SND_WL2] |
||
2305 | hidnplayr | 1256 | ; cmp eax, [edx + TCP_header.AckNumber] |
1733 | hidnplayr | 1257 | ; jne @f |
1258 | ; |
||
1259 | ; ;; mov eax, tiwin |
||
1260 | ; cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
2300 | hidnplayr | 1261 | ; jbe @f |
1733 | hidnplayr | 1262 | ; |
1263 | ; ;;; update stats |
||
1264 | ; |
||
1265 | ; @@: |
||
1266 | |||
2308 | hidnplayr | 1267 | mov eax, dword [edx + TCP_header.Window] |
1268 | cmp eax, [ebx + TCP_SOCKET.max_sndwnd] |
||
1269 | jbe @f |
||
1270 | mov [ebx + TCP_SOCKET.max_sndwnd], eax |
||
1733 | hidnplayr | 1271 | @@: |
2308 | hidnplayr | 1272 | mov [ebx + TCP_SOCKET.SND_WND], eax |
1733 | hidnplayr | 1273 | |
2308 | hidnplayr | 1274 | push [edx + TCP_header.SequenceNumber] |
1275 | pop [ebx + TCP_SOCKET.SND_WL1] |
||
1733 | hidnplayr | 1276 | |
2308 | hidnplayr | 1277 | push [edx + TCP_header.AckNumber] |
1278 | pop [ebx + TCP_SOCKET.SND_WL2] |
||
1733 | hidnplayr | 1279 | |
2308 | hidnplayr | 1280 | ;;; needoutput = 1 |
1733 | hidnplayr | 1281 | |
1282 | .no_window_update: |
||
1283 | |||
1284 | |||
1285 | |||
1286 | |||
1287 | |||
1288 | |||
1289 | |||
1290 | ;----------------- |
||
1291 | ; process URG flag |
||
1292 | |||
2308 | hidnplayr | 1293 | test [edx + TCP_header.Flags], TH_URG |
1294 | jz .not_urgent |
||
1733 | hidnplayr | 1295 | |
2308 | hidnplayr | 1296 | cmp [edx + TCP_header.UrgentPointer], 0 |
1297 | jz .not_urgent |
||
1733 | hidnplayr | 1298 | |
2308 | hidnplayr | 1299 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1300 | je .not_urgent |
||
1733 | hidnplayr | 1301 | |
1302 | ; Ignore bogus urgent offsets |
||
1303 | |||
2308 | hidnplayr | 1304 | ;;; 1040-1050 |
1733 | hidnplayr | 1305 | |
2308 | hidnplayr | 1306 | movzx eax, [edx + TCP_header.UrgentPointer] |
1307 | add eax, [ebx + STREAM_SOCKET.rcv + RING_BUFFER.size] |
||
1308 | cmp eax, SOCKET_MAXDATA |
||
1309 | jbe .not_urgent |
||
1733 | hidnplayr | 1310 | |
2308 | hidnplayr | 1311 | mov [edx + TCP_header.UrgentPointer], 0 |
1312 | and [edx + TCP_header.Flags], not (TH_URG) |
||
1313 | jmp .do_data |
||
1733 | hidnplayr | 1314 | |
1315 | .not_urgent: |
||
1316 | |||
1317 | ; processing of received urgent pointer |
||
1318 | |||
2308 | hidnplayr | 1319 | ;;; TODO (1051-1093) |
1733 | hidnplayr | 1320 | |
1321 | |||
1322 | |||
1323 | |||
1324 | |||
1325 | |||
1326 | |||
1327 | |||
1328 | ;-------------------------------- |
||
1329 | ; process the data in the segment |
||
1330 | |||
1331 | .do_data: |
||
1332 | |||
2308 | hidnplayr | 1333 | DEBUGF 1,"TCP: do data (%u)\n", ecx |
1733 | hidnplayr | 1334 | |
2308 | hidnplayr | 1335 | test [edx + TCP_header.Flags], TH_FIN |
1336 | jnz .process_fin |
||
1733 | hidnplayr | 1337 | |
2308 | hidnplayr | 1338 | cmp [ebx + TCP_SOCKET.t_state], TCPS_FIN_WAIT_1 |
1339 | jae .dont_do_data |
||
1733 | hidnplayr | 1340 | |
2308 | hidnplayr | 1341 | test ecx, ecx |
1342 | jz .final_processing |
||
1733 | hidnplayr | 1343 | |
2308 | hidnplayr | 1344 | DEBUGF 1,"Processing data in segment\n" |
1733 | hidnplayr | 1345 | |
1346 | ;; TODO: check if data is in sequence ! |
||
1347 | |||
2308 | hidnplayr | 1348 | movzx esi, [edx + TCP_header.DataOffset] |
1349 | add esi, edx |
||
1733 | hidnplayr | 1350 | |
2308 | hidnplayr | 1351 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK |
1352 | add [ebx + TCP_SOCKET.RCV_NXT], ecx |
||
1733 | hidnplayr | 1353 | |
2308 | hidnplayr | 1354 | lea eax, [ebx + STREAM_SOCKET.rcv] |
1355 | call SOCKET_ring_write |
||
1733 | hidnplayr | 1356 | |
2308 | hidnplayr | 1357 | mov eax, ebx |
1358 | call SOCKET_notify_owner |
||
1733 | hidnplayr | 1359 | |
2308 | hidnplayr | 1360 | jmp .final_processing |
1733 | hidnplayr | 1361 | |
1362 | |||
1363 | .dont_do_data: |
||
1364 | |||
1365 | |||
1366 | |||
1367 | |||
1368 | |||
1369 | |||
1370 | |||
1371 | ;--------------- |
||
1372 | ; FIN processing |
||
1373 | |||
1374 | .process_fin: |
||
1375 | |||
2308 | hidnplayr | 1376 | DEBUGF 1,"Processing FIN\n" |
1733 | hidnplayr | 1377 | |
2308 | hidnplayr | 1378 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
1379 | je .not_first_fin |
||
1380 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSING |
||
1381 | je .not_first_fin |
||
1382 | cmp [ebx + TCP_SOCKET.t_state], TCPS_FIN_WAIT_2 |
||
1383 | je .not_first_fin |
||
1774 | hidnplayr | 1384 | |
2308 | hidnplayr | 1385 | DEBUGF 1,"First FIN for this connection\n" |
1774 | hidnplayr | 1386 | |
2308 | hidnplayr | 1387 | mov eax, ebx |
1388 | call SOCKET_cant_recv_more |
||
1774 | hidnplayr | 1389 | |
2308 | hidnplayr | 1390 | mov [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1391 | inc [ebx + TCP_SOCKET.RCV_NXT] |
||
1774 | hidnplayr | 1392 | |
1393 | .not_first_fin: |
||
2308 | hidnplayr | 1394 | mov eax, [ebx + TCP_SOCKET.t_state] |
1395 | shl eax, 2 |
||
1396 | jmp dword [eax + .FIN_sw_list] |
||
1733 | hidnplayr | 1397 | |
1398 | .FIN_sw_list: |
||
2308 | hidnplayr | 1399 | dd .no_fin ;TCPS_CLOSED |
1400 | dd .no_fin ;TCPS_LISTEN |
||
1401 | dd .no_fin ;TCPS_SYN_SENT |
||
1402 | dd .fin_syn_est ;TCPS_SYN_RECEIVED |
||
1403 | dd .fin_syn_est ;TCPS_ESTABLISHED |
||
1404 | dd .no_fin ;TCPS_CLOSE_WAIT |
||
1405 | dd .fin_wait1 ;TCPS_FIN_WAIT_1 |
||
1406 | dd .no_fin ;TCPS_CLOSING |
||
1407 | dd .no_fin ;TCPS_LAST_ACK |
||
1408 | dd .fin_wait2 ;TCPS_FIN_WAIT_2 |
||
1409 | dd .fin_timed ;TCPS_TIMED_WAIT |
||
1733 | hidnplayr | 1410 | |
1411 | .fin_syn_est: |
||
1412 | |||
2308 | hidnplayr | 1413 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
1414 | jmp .no_fin |
||
1733 | hidnplayr | 1415 | |
1416 | .fin_wait1: |
||
1417 | |||
2308 | hidnplayr | 1418 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSING |
1419 | jmp .no_fin |
||
1733 | hidnplayr | 1420 | |
1421 | .fin_wait2: |
||
1422 | |||
2308 | hidnplayr | 1423 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1424 | mov eax, ebx |
||
1425 | call TCP_cancel_timers |
||
1426 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
1427 | call SOCKET_is_disconnected |
||
1428 | jmp .no_fin |
||
1733 | hidnplayr | 1429 | |
1430 | .fin_timed: |
||
2308 | hidnplayr | 1431 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
1432 | jmp .no_fin |
||
1733 | hidnplayr | 1433 | |
1434 | .no_fin: |
||
1435 | |||
1436 | |||
1437 | |||
1438 | |||
1439 | |||
1440 | |||
1441 | |||
1442 | |||
1443 | ;----------------- |
||
1444 | ; Final processing |
||
1445 | |||
1446 | .final_processing: |
||
1447 | |||
2308 | hidnplayr | 1448 | DEBUGF 1,"Final processing\n" |
1733 | hidnplayr | 1449 | |
2308 | hidnplayr | 1450 | ;;; if debug enabled, output packet |
1733 | hidnplayr | 1451 | |
2308 | hidnplayr | 1452 | ;test needoutput, needoutput |
1453 | ;jz .dumpit |
||
1733 | hidnplayr | 1454 | |
2308 | hidnplayr | 1455 | test [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1456 | jz .dumpit |
||
1733 | hidnplayr | 1457 | |
2308 | hidnplayr | 1458 | DEBUGF 1,"ACK now!\n" |
1733 | hidnplayr | 1459 | |
2308 | hidnplayr | 1460 | push ebx |
1461 | mov eax, ebx |
||
1462 | call TCP_output |
||
1463 | pop ebx |
||
1733 | hidnplayr | 1464 | |
1465 | .dumpit: |
||
1466 | |||
2308 | hidnplayr | 1467 | mov [ebx + SOCKET.lock], 0 |
1733 | hidnplayr | 1468 | |
2308 | hidnplayr | 1469 | call kernel_free |
1470 | add esp, 4 |
||
1471 | ret |
||
1733 | hidnplayr | 1472 | |
1473 | |||
1474 | |||
1475 | |||
1476 | |||
1477 | |||
1478 | |||
1479 | ;------------------------------------------ |
||
1480 | ; Generate an ACK, droping incoming segment |
||
1481 | |||
1482 | align 4 |
||
1483 | .drop_after_ack: |
||
1484 | |||
2308 | hidnplayr | 1485 | DEBUGF 1,"Drop after ACK\n" |
1733 | hidnplayr | 1486 | |
2308 | hidnplayr | 1487 | test [edx + TCP_header.Flags], TH_RST |
1488 | jnz .drop |
||
1733 | hidnplayr | 1489 | |
2308 | hidnplayr | 1490 | and [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1733 | hidnplayr | 1491 | |
2308 | hidnplayr | 1492 | mov [ebx + SOCKET.lock], 0 |
1733 | hidnplayr | 1493 | |
2308 | hidnplayr | 1494 | push ebx |
1838 | hidnplayr | 1495 | ; mov cl, TH_ACK |
1496 | ; call TCP_respond_socket |
||
2308 | hidnplayr | 1497 | mov eax, ebx |
1498 | call TCP_output |
||
1499 | pop ebx |
||
1733 | hidnplayr | 1500 | |
2308 | hidnplayr | 1501 | call kernel_free |
1502 | add esp, 4 |
||
1503 | ret |
||
1733 | hidnplayr | 1504 | |
1505 | |||
1506 | |||
1507 | |||
1508 | |||
1509 | |||
1510 | |||
1511 | |||
1512 | ;------------------------------------------- |
||
1513 | ; Generate an RST, dropping incoming segment |
||
1514 | |||
1515 | align 4 |
||
1516 | .drop_with_reset: |
||
1517 | |||
2308 | hidnplayr | 1518 | mov [ebx + SOCKET.lock], 0 |
1733 | hidnplayr | 1519 | |
1520 | .drop_with_reset_not_locked: |
||
1521 | |||
2308 | hidnplayr | 1522 | DEBUGF 1,"Drop with reset\n" |
1733 | hidnplayr | 1523 | |
2308 | hidnplayr | 1524 | test [edx + TCP_header.Flags], TH_RST |
1525 | jnz .drop |
||
1733 | hidnplayr | 1526 | |
2308 | hidnplayr | 1527 | ;;; if its a multicast/broadcast, also drop |
1733 | hidnplayr | 1528 | |
2308 | hidnplayr | 1529 | test [edx + TCP_header.Flags], TH_ACK |
1530 | jnz .respond_ack |
||
1733 | hidnplayr | 1531 | |
2308 | hidnplayr | 1532 | test [edx + TCP_header.Flags], TH_SYN |
1533 | jnz .respond_syn |
||
1733 | hidnplayr | 1534 | |
2308 | hidnplayr | 1535 | call kernel_free |
1536 | add esp, 4 |
||
1537 | ret |
||
1733 | hidnplayr | 1538 | |
1539 | .respond_ack: |
||
1540 | |||
2308 | hidnplayr | 1541 | push ebx |
1542 | mov cl, TH_RST |
||
1543 | call TCP_respond_socket |
||
1544 | pop ebx |
||
1733 | hidnplayr | 1545 | |
2308 | hidnplayr | 1546 | jmp .destroy_new_socket |
1733 | hidnplayr | 1547 | |
1548 | |||
1549 | .respond_syn: |
||
1550 | |||
2308 | hidnplayr | 1551 | push ebx |
1552 | mov cl, TH_RST + TH_ACK |
||
1553 | call TCP_respond_socket |
||
1554 | pop ebx |
||
1733 | hidnplayr | 1555 | |
2308 | hidnplayr | 1556 | jmp .destroy_new_socket |
1733 | hidnplayr | 1557 | |
1558 | |||
1559 | |||
1560 | |||
1561 | |||
1562 | |||
1563 | |||
1564 | ;----- |
||
1565 | ; Drop |
||
1566 | |||
1567 | align 4 |
||
1568 | .drop: |
||
1569 | |||
2308 | hidnplayr | 1570 | mov [ebx + SOCKET.lock], 0 |
1733 | hidnplayr | 1571 | |
1572 | .drop_not_locked: |
||
1573 | |||
2308 | hidnplayr | 1574 | DEBUGF 1,"Dropping packet\n" |
1733 | hidnplayr | 1575 | |
2308 | hidnplayr | 1576 | ;;;; If debugging options are enabled, output the packet somwhere |
1733 | hidnplayr | 1577 | |
1578 | .destroy_new_socket: |
||
1579 | |||
2308 | hidnplayr | 1580 | ;;;; kill the newly created socket |
1733 | hidnplayr | 1581 | |
2308 | hidnplayr | 1582 | call kernel_free |
1583 | add esp, 4 |
||
1584 | ret |