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1763 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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2362 | hidnplayr | 3 | ;; Copyright (C) KolibriOS team 2004-2012. All rights reserved. ;; |
1763 | 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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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: 2995 $ |
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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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2310 | hidnplayr | 27 | ; esi = ptr to TCP segment |
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 | |||
2942 | hidnplayr | 37 | pushfd |
38 | cli |
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39 | |||
2957 | hidnplayr | 40 | DEBUGF 1,"TCP_input: size=%u time=%d\n", ecx, [timer_ticks] |
1733 | hidnplayr | 41 | |
2930 | hidnplayr | 42 | ; First, record the current time |
2937 | hidnplayr | 43 | mov eax, [timer_ticks] ; in 1/100 seconds |
2942 | hidnplayr | 44 | mov [esp+8], eax |
1733 | hidnplayr | 45 | |
2930 | hidnplayr | 46 | ; then, re-calculate the checksum (if not already done by hw) |
47 | ; test [ebx + NET_DEVICE.hwacc], HWACC_TCP_IPv4_IN |
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48 | ; jnz .checksum_ok |
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49 | |||
2390 | hidnplayr | 50 | push ecx esi |
51 | pushw [esi + TCP_header.Checksum] |
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52 | mov [esi + TCP_header.Checksum], 0 |
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53 | TCP_checksum (edi), (edi+4) |
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2937 | hidnplayr | 54 | pop cx ; previous checksum |
2390 | hidnplayr | 55 | cmp cx, dx |
56 | pop edx ecx |
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2600 | hidnplayr | 57 | jne .drop_no_socket |
2930 | hidnplayr | 58 | .checksum_ok: |
1733 | hidnplayr | 59 | |
2930 | hidnplayr | 60 | ; Verify the data offset |
2390 | hidnplayr | 61 | and [edx + TCP_header.DataOffset], 0xf0 ; Calculate TCP segment header size (throwing away unused reserved bits in TCP header) |
62 | shr [edx + TCP_header.DataOffset], 2 |
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63 | 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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2600 | hidnplayr | 64 | jb .drop_no_socket ; If not, drop the packet |
1733 | hidnplayr | 65 | |
2390 | hidnplayr | 66 | movzx eax, [edx + TCP_header.DataOffset] |
67 | sub ecx, eax ; substract TCP header size from total segment size |
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2600 | hidnplayr | 68 | jb .drop_no_socket ; If total segment size is less then the advertised header size, drop packet |
2891 | hidnplayr | 69 | DEBUGF 1,"TCP_input: %u bytes of data\n", ecx |
1733 | hidnplayr | 70 | |
71 | ;------------------------------------------- |
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72 | ; Convert Big-endian values to little endian |
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73 | |||
2390 | hidnplayr | 74 | ntohd [edx + TCP_header.SequenceNumber] |
75 | ntohd [edx + TCP_header.AckNumber] |
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1733 | hidnplayr | 76 | |
2390 | hidnplayr | 77 | ntohw [edx + TCP_header.Window] |
78 | ntohw [edx + TCP_header.UrgentPointer] |
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1733 | hidnplayr | 79 | |
2930 | hidnplayr | 80 | ;------------------------ |
81 | ; Find the socket pointer |
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1733 | hidnplayr | 82 | |
83 | ; IP Packet TCP Destination Port = local Port |
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84 | ; (IP Packet SenderAddress = Remote IP) OR (Remote IP = 0) |
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2309 | hidnplayr | 85 | ; (IP Packet TCP Source Port = remote Port) OR (remote Port = 0) |
1733 | hidnplayr | 86 | |
2937 | hidnplayr | 87 | .findpcb: |
2390 | hidnplayr | 88 | mov ebx, net_sockets |
89 | mov si, [edx + TCP_header.DestinationPort] |
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1733 | hidnplayr | 90 | |
91 | .socket_loop: |
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2390 | hidnplayr | 92 | mov ebx, [ebx + SOCKET.NextPtr] |
93 | or ebx, ebx |
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2600 | hidnplayr | 94 | jz .drop_with_reset_no_socket |
1733 | hidnplayr | 95 | |
2390 | hidnplayr | 96 | cmp [ebx + SOCKET.Domain], AF_INET4 |
97 | jne .socket_loop |
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1733 | hidnplayr | 98 | |
2390 | hidnplayr | 99 | cmp [ebx + SOCKET.Protocol], IP_PROTO_TCP |
100 | jne .socket_loop |
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1733 | hidnplayr | 101 | |
2390 | hidnplayr | 102 | cmp [ebx + TCP_SOCKET.LocalPort], si |
103 | jne .socket_loop |
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1733 | hidnplayr | 104 | |
2390 | hidnplayr | 105 | mov eax, [ebx + IP_SOCKET.RemoteIP] |
106 | cmp eax, [edi] ; Ipv4 source addres |
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107 | je @f |
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108 | test eax, eax |
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109 | jnz .socket_loop |
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1733 | hidnplayr | 110 | @@: |
111 | |||
2390 | hidnplayr | 112 | mov ax, [ebx + TCP_SOCKET.RemotePort] |
113 | cmp [edx + TCP_header.SourcePort], ax |
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114 | je .found_socket |
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115 | test ax, ax |
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116 | jnz .socket_loop |
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117 | .found_socket: ; ebx now contains the socketpointer |
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2891 | hidnplayr | 118 | DEBUGF 1,"TCP_input: socket ptr=%x state=%u flags=%x\n", ebx, [ebx + TCP_SOCKET.t_state], [edx + TCP_header.Flags]:2 |
1733 | hidnplayr | 119 | |
2930 | hidnplayr | 120 | ;------------- |
2890 | hidnplayr | 121 | ; update stats |
2930 | hidnplayr | 122 | |
2890 | hidnplayr | 123 | inc [TCP_segments_rx] ; FIXME: correct interface? |
1733 | hidnplayr | 124 | |
125 | ;---------------------------- |
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126 | ; Check if socket isnt closed |
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127 | |||
2390 | hidnplayr | 128 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
2937 | hidnplayr | 129 | je .drop_no_socket |
1733 | hidnplayr | 130 | |
131 | ;---------------- |
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132 | ; Lock the socket |
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133 | |||
2402 | hidnplayr | 134 | pusha |
135 | lea ecx, [ebx + SOCKET.mutex] |
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136 | call mutex_lock |
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137 | popa |
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1830 | hidnplayr | 138 | |
2891 | hidnplayr | 139 | DEBUGF 1,"TCP_input: socket locked\n" |
1733 | hidnplayr | 140 | |
2937 | hidnplayr | 141 | ;--------------------------- |
142 | ; disable all temporary bits |
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2891 | hidnplayr | 143 | |
2937 | hidnplayr | 144 | mov [ebx + TCP_SOCKET.temp_bits], 0 |
2891 | hidnplayr | 145 | |
1733 | hidnplayr | 146 | ;--------------------------------------- |
147 | ; unscale the window into a 32 bit value |
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148 | |||
2390 | hidnplayr | 149 | movzx eax, [edx + TCP_header.Window] |
150 | push ecx |
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151 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
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152 | shl eax, cl |
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153 | mov dword [edx + TCP_header.Window], eax ; word after window is checksum, we dont need checksum anymore |
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154 | pop ecx |
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1733 | hidnplayr | 155 | |
2930 | hidnplayr | 156 | ;--------------------------------------- |
157 | ; Are we accepting incoming connections? |
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1733 | hidnplayr | 158 | |
2390 | hidnplayr | 159 | test [ebx + SOCKET.options], SO_ACCEPTCON |
2954 | hidnplayr | 160 | jz .no_accept |
1733 | hidnplayr | 161 | |
2954 | hidnplayr | 162 | DEBUGF 1,"TCP_input: Accepting new connection\n" |
163 | |||
164 | pusha |
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165 | lea ecx, [ebx + SOCKET.mutex] |
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166 | call mutex_unlock |
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167 | popa |
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168 | |||
169 | push ecx edx esi edi ;;; |
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170 | call SOCKET_fork |
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171 | pop edi esi edx ecx |
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172 | |||
173 | test eax, eax |
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174 | jz .drop_no_socket |
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175 | |||
176 | mov ebx, eax |
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177 | |||
178 | mov [ebx + TCP_SOCKET.temp_bits], TCP_BIT_DROPSOCKET ;;; FIXME: should we take over bits from previous socket? |
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179 | |||
180 | push dword [edi + 4] ; Ipv4 destination addres |
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181 | pop [ebx + IP_SOCKET.LocalIP] |
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182 | |||
183 | push [edx + TCP_header.DestinationPort] |
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184 | pop [ebx + TCP_SOCKET.LocalPort] |
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185 | |||
186 | mov [ebx + TCP_SOCKET.t_state], TCPS_LISTEN |
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187 | .no_accept: |
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188 | |||
189 | |||
1733 | hidnplayr | 190 | ;------------------------------------- |
191 | ; Reset idle timer and keepalive timer |
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192 | |||
2390 | hidnplayr | 193 | mov [ebx + TCP_SOCKET.t_idle], 0 |
194 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval |
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1733 | hidnplayr | 195 | |
196 | ;-------------------- |
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197 | ; Process TCP options |
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198 | |||
2955 | hidnplayr | 199 | push ecx |
2954 | hidnplayr | 200 | |
201 | movzx ecx, [edx + TCP_header.DataOffset] |
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202 | cmp ecx, sizeof.TCP_header ; Does header contain any options? |
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2390 | hidnplayr | 203 | je .no_options |
1733 | hidnplayr | 204 | |
2891 | hidnplayr | 205 | DEBUGF 1,"TCP_input: Segment has options\n" |
1733 | hidnplayr | 206 | |
2954 | hidnplayr | 207 | ;;; FIXME: for LISTEN, options should be called after we determined route, we need it for MSS |
208 | ;;; cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN ; no options when in listen state |
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209 | ;;; jz .not_uni_xfer ; also no header prediction |
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1733 | hidnplayr | 210 | |
2954 | hidnplayr | 211 | add ecx, edx |
2390 | hidnplayr | 212 | lea esi, [edx + sizeof.TCP_header] |
1733 | hidnplayr | 213 | |
214 | .opt_loop: |
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2954 | hidnplayr | 215 | cmp esi, ecx ; are we scanning outside of header? |
2390 | hidnplayr | 216 | jae .no_options |
2954 | hidnplayr | 217 | lodsb |
218 | cmp al, TCP_OPT_EOL ; end of option list? |
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219 | je .no_options |
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220 | cmp al, TCP_OPT_NOP |
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221 | je .opt_loop |
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222 | cmp al, TCP_OPT_MAXSEG |
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2390 | hidnplayr | 223 | je .opt_maxseg |
2954 | hidnplayr | 224 | cmp al, TCP_OPT_WINDOW |
2390 | hidnplayr | 225 | je .opt_window |
2954 | hidnplayr | 226 | cmp al, TCP_OPT_SACK_PERMIT |
227 | je .opt_sack_permit |
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228 | ; cmp al, TCP_OPT_SACK |
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229 | ; je .opt_sack |
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230 | cmp al, TCP_OPT_TIMESTAMP |
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2390 | hidnplayr | 231 | je .opt_timestamp |
2954 | hidnplayr | 232 | DEBUGF 1,"TCP_input: unknown option:%u\n", al |
2937 | hidnplayr | 233 | jmp .no_options ; If we reach here, some unknown options were received, skip them all! |
1733 | hidnplayr | 234 | |
235 | .opt_maxseg: |
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2954 | hidnplayr | 236 | lodsb |
237 | cmp al, 4 |
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2937 | hidnplayr | 238 | jne .no_options ; error occured, ignore all options! |
1733 | hidnplayr | 239 | |
2390 | hidnplayr | 240 | test [edx + TCP_header.Flags], TH_SYN |
241 | jz @f |
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1733 | hidnplayr | 242 | |
2954 | hidnplayr | 243 | lodsw |
2390 | hidnplayr | 244 | rol ax, 8 |
2891 | hidnplayr | 245 | DEBUGF 1,"TCP_input: Maxseg=%u\n", ax |
2390 | hidnplayr | 246 | mov [ebx + TCP_SOCKET.t_maxseg], eax |
1733 | hidnplayr | 247 | @@: |
2390 | hidnplayr | 248 | jmp .opt_loop |
1733 | hidnplayr | 249 | |
250 | |||
251 | .opt_window: |
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2954 | hidnplayr | 252 | lodsb |
253 | cmp al, 3 |
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2390 | hidnplayr | 254 | jne .no_options |
1733 | hidnplayr | 255 | |
2390 | hidnplayr | 256 | test [edx + TCP_header.Flags], TH_SYN |
257 | jz @f |
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1733 | hidnplayr | 258 | |
2954 | hidnplayr | 259 | DEBUGF 1,"TCP_input: Got window scale option\n" |
260 | or [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
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1733 | hidnplayr | 261 | |
2954 | hidnplayr | 262 | lodsb |
263 | mov [ebx + TCP_SOCKET.SND_SCALE], al |
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264 | ;;;;; TODO |
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265 | |||
1733 | hidnplayr | 266 | @@: |
2390 | hidnplayr | 267 | jmp .opt_loop |
1733 | hidnplayr | 268 | |
269 | |||
2954 | hidnplayr | 270 | .opt_sack_permit: |
271 | lodsb |
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272 | cmp al, 2 |
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273 | jne .no_options |
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274 | |||
275 | test [edx + TCP_header.Flags], TH_SYN |
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276 | jz @f |
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277 | |||
278 | DEBUGF 1,"TCP_input: Selective Acknowledgement permitted\n" |
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279 | or [ebx + TCP_SOCKET.t_flags], TF_SACK_PERMIT |
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280 | |||
281 | @@: |
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282 | jmp .opt_loop |
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283 | |||
284 | |||
1733 | hidnplayr | 285 | .opt_timestamp: |
2954 | hidnplayr | 286 | lodsb |
287 | cmp al, 10 ; length must be 10 |
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2390 | hidnplayr | 288 | jne .no_options |
1733 | hidnplayr | 289 | |
2891 | hidnplayr | 290 | DEBUGF 1,"TCP_input: Got timestamp option\n" |
1733 | hidnplayr | 291 | |
2954 | hidnplayr | 292 | test [edx + TCP_header.Flags], TH_SYN |
293 | jz @f |
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294 | or [ebx + TCP_SOCKET.t_flags], TF_RCVD_TSTMP |
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295 | @@: |
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296 | |||
297 | lodsd |
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298 | mov [ebx + TCP_SOCKET.ts_val], eax |
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299 | lodsd ; timestamp echo reply |
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300 | mov [ebx + TCP_SOCKET.ts_ecr], eax |
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2937 | hidnplayr | 301 | or [ebx + TCP_SOCKET.temp_bits], TCP_BIT_TIMESTAMP |
2930 | hidnplayr | 302 | |
2946 | hidnplayr | 303 | ; Since we have a timestamp, lets do the paws test right away! |
304 | |||
305 | test [edx + TCP_header.Flags], TH_RST |
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306 | jnz .no_paws |
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307 | |||
308 | mov eax, [ebx + TCP_SOCKET.ts_recent] |
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309 | test eax, eax |
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310 | jz .no_paws |
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311 | cmp eax, [ebx + TCP_SOCKET.ts_val] |
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312 | jge .no_paws |
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313 | |||
314 | DEBUGF 1,"TCP_input: PAWS: detected an old segment\n" |
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315 | |||
2954 | hidnplayr | 316 | mov eax, [esp+4+4+4] ; tcp_now |
2946 | hidnplayr | 317 | sub eax, [ebx + TCP_SOCKET.ts_recent_age] |
318 | cmp eax, TCP_PAWS_IDLE |
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2947 | hidnplayr | 319 | jle .drop_after_ack ; TODO: update stats |
2946 | hidnplayr | 320 | |
321 | mov [ebx + TCP_SOCKET.ts_recent], 0 ; timestamp was invalid, fix it. |
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322 | .no_paws: |
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2390 | hidnplayr | 323 | jmp .opt_loop |
1733 | hidnplayr | 324 | |
325 | .no_options: |
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326 | |||
2954 | hidnplayr | 327 | pop ecx |
328 | |||
1733 | hidnplayr | 329 | ;----------------------------------------------------------------------- |
330 | ; Time to do some header prediction (Original Principle by Van Jacobson) |
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331 | |||
332 | ; There are two common cases for an uni-directional data transfer. |
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333 | ; |
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334 | ; General rule: the packets has no control flags, is in-sequence, |
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335 | ; window width didnt change and we're not retransmitting. |
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336 | ; |
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337 | ; Second rules: |
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338 | ; - If the length is 0 and the ACK moved forward, we're the sender side of the transfer. |
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339 | ; 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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340 | ; |
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341 | ; - If the length is not 0 and the ACK didn't move, we're the receiver side of the transfer. |
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342 | ; 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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343 | |||
2390 | hidnplayr | 344 | cmp [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
345 | jnz .not_uni_xfer |
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1733 | hidnplayr | 346 | |
2390 | hidnplayr | 347 | test [edx + TCP_header.Flags], TH_SYN + TH_FIN + TH_RST + TH_URG |
348 | jnz .not_uni_xfer |
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1733 | hidnplayr | 349 | |
2390 | hidnplayr | 350 | test [edx + TCP_header.Flags], TH_ACK |
351 | jz .not_uni_xfer |
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1733 | hidnplayr | 352 | |
2390 | hidnplayr | 353 | mov eax, [edx + TCP_header.SequenceNumber] |
354 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
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355 | jne .not_uni_xfer |
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1733 | hidnplayr | 356 | |
2390 | hidnplayr | 357 | mov eax, dword [edx + TCP_header.Window] |
358 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
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359 | jne .not_uni_xfer |
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1733 | hidnplayr | 360 | |
2390 | hidnplayr | 361 | mov eax, [ebx + TCP_SOCKET.SND_NXT] |
362 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
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363 | jne .not_uni_xfer |
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1733 | hidnplayr | 364 | |
365 | ;--------------------------------------- |
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366 | ; check if we are sender in the uni-xfer |
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367 | |||
368 | ; If the following 4 conditions are all true, this segment is a pure ACK. |
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369 | ; |
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370 | ; - The segment contains no data. |
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2390 | hidnplayr | 371 | test ecx, ecx |
372 | jnz .not_sender |
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1733 | hidnplayr | 373 | |
374 | ; - The congestion window is greater than or equal to the current send window. |
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375 | ; 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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2390 | hidnplayr | 376 | mov eax, [ebx + TCP_SOCKET.SND_CWND] |
377 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
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378 | jb .not_uni_xfer |
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1733 | hidnplayr | 379 | |
380 | ; - The acknowledgment field in the segment is less than or equal to the maximum sequence number sent. |
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2390 | hidnplayr | 381 | mov eax, [edx + TCP_header.AckNumber] |
382 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
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383 | ja .not_uni_xfer |
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1733 | hidnplayr | 384 | |
385 | ; - The acknowledgment field in the segment is greater than the largest unacknowledged sequence number. |
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2390 | hidnplayr | 386 | sub eax, [ebx + TCP_SOCKET.SND_UNA] |
387 | jbe .not_uni_xfer |
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1733 | hidnplayr | 388 | |
2891 | hidnplayr | 389 | DEBUGF 1,"TCP_input: Header prediction: we are sender\n" |
1733 | hidnplayr | 390 | |
391 | ;--------------------------------- |
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392 | ; Packet is a pure ACK, process it |
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393 | |||
394 | ; Delete acknowledged bytes from send buffer |
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2390 | hidnplayr | 395 | pusha |
396 | mov ecx, eax |
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397 | lea eax, [ebx + STREAM_SOCKET.snd] |
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398 | call SOCKET_ring_free |
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399 | popa |
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1733 | hidnplayr | 400 | |
2930 | hidnplayr | 401 | ; Update RTT estimators |
402 | |||
2937 | hidnplayr | 403 | test [ebx + TCP_SOCKET.temp_bits], TCP_BIT_TIMESTAMP |
404 | jz .no_timestamp_rtt |
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2942 | hidnplayr | 405 | mov eax, [esp + 4+4] ; timestamp when this segment was received |
2937 | hidnplayr | 406 | sub eax, [ebx + TCP_SOCKET.ts_ecr] |
407 | inc eax |
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408 | call TCP_xmit_timer |
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409 | jmp .rtt_done |
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2930 | hidnplayr | 410 | |
2937 | hidnplayr | 411 | .no_timestamp_rtt: |
412 | cmp [ebx + TCP_SOCKET.t_rtt], 0 |
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413 | je .rtt_done |
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414 | mov eax, [edx + TCP_header.AckNumber] |
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415 | cmp eax, [ebx + TCP_SOCKET.t_rtseq] |
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416 | jbe .rtt_done |
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417 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
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418 | call TCP_xmit_timer |
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2930 | hidnplayr | 419 | |
2937 | hidnplayr | 420 | .rtt_done: |
421 | |||
1733 | hidnplayr | 422 | ; update window pointers |
2390 | hidnplayr | 423 | mov eax, [edx + TCP_header.AckNumber] |
424 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
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1733 | hidnplayr | 425 | |
426 | ; Stop retransmit timer |
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2390 | hidnplayr | 427 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 |
1733 | hidnplayr | 428 | |
429 | ; Awaken waiting processes |
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2402 | hidnplayr | 430 | pusha |
431 | lea ecx, [ebx + SOCKET.mutex] |
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432 | call mutex_unlock |
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433 | popa |
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434 | |||
2390 | hidnplayr | 435 | mov eax, ebx |
436 | call SOCKET_notify_owner |
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1733 | hidnplayr | 437 | |
1763 | hidnplayr | 438 | ; Generate more output |
2390 | hidnplayr | 439 | call TCP_output |
1733 | hidnplayr | 440 | |
2937 | hidnplayr | 441 | jmp .drop_no_socket |
1763 | hidnplayr | 442 | |
1733 | hidnplayr | 443 | ;------------------------------------------------- |
444 | ; maybe we are the receiver in the uni-xfer then.. |
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445 | |||
446 | .not_sender: |
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447 | ; - The amount of data in the segment is greater than 0 (data count is in ecx) |
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448 | |||
449 | ; - The acknowledgment field equals the largest unacknowledged sequence number. This means no data is acknowledged by this segment. |
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2390 | hidnplayr | 450 | mov eax, [edx + TCP_header.AckNumber] |
451 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
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452 | jne .not_uni_xfer |
||
1733 | hidnplayr | 453 | |
454 | ; - The reassembly list of out-of-order segments for the connection is empty (seg_next equals tp). |
||
455 | |||
456 | ;;; TODO |
||
457 | |||
2930 | hidnplayr | 458 | ; jnz .not_uni_xfer |
1733 | hidnplayr | 459 | |
460 | ; Complete processing of received data |
||
461 | |||
2891 | hidnplayr | 462 | DEBUGF 1,"TCP_input: Header prediction: we are receiving %u bytes\n", ecx |
1733 | hidnplayr | 463 | |
2390 | hidnplayr | 464 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
1763 | hidnplayr | 465 | |
2390 | hidnplayr | 466 | movzx esi, [edx + TCP_header.DataOffset] |
467 | add esi, edx |
||
468 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
469 | call SOCKET_ring_write ; Add the data to the socket buffer |
||
1733 | hidnplayr | 470 | |
2390 | hidnplayr | 471 | mov eax, ebx |
472 | call SOCKET_notify_owner |
||
1733 | hidnplayr | 473 | |
2390 | hidnplayr | 474 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK ; Set delayed ack flag |
1733 | hidnplayr | 475 | |
2390 | hidnplayr | 476 | jmp .drop |
1733 | hidnplayr | 477 | |
478 | |||
479 | |||
480 | |||
481 | |||
482 | |||
483 | ;-------------------------------------------------- |
||
484 | ; Header prediction failed, do it the slow way |
||
485 | |||
486 | .not_uni_xfer: |
||
487 | |||
2891 | hidnplayr | 488 | DEBUGF 1,"TCP_input: Header prediction failed\n" |
1733 | hidnplayr | 489 | |
490 | ; Calculate receive window size |
||
491 | |||
2942 | hidnplayr | 492 | push edx |
2937 | hidnplayr | 493 | mov eax, SOCKETBUFFSIZE |
494 | sub eax, [ebx + STREAM_SOCKET.rcv.size] |
||
495 | mov edx, [ebx + TCP_SOCKET.RCV_ADV] |
||
496 | sub edx, [ebx + TCP_SOCKET.RCV_NXT] |
||
497 | cmp eax, edx |
||
2942 | hidnplayr | 498 | jg @f |
2937 | hidnplayr | 499 | mov eax, edx |
500 | @@: |
||
2957 | hidnplayr | 501 | DEBUGF 1,"Receive window size=%d\n", eax |
502 | mov [ebx + TCP_SOCKET.RCV_WND], eax |
||
2942 | hidnplayr | 503 | pop edx |
1733 | hidnplayr | 504 | |
2937 | hidnplayr | 505 | ; If listen or Syn sent, go to that specific code right away |
506 | |||
2390 | hidnplayr | 507 | cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN |
508 | je .LISTEN |
||
1733 | hidnplayr | 509 | |
2390 | hidnplayr | 510 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_SENT |
511 | je .SYN_SENT |
||
1733 | hidnplayr | 512 | |
2891 | hidnplayr | 513 | DEBUGF 1,"TCP_input: state is not listen or syn_sent\n" |
1733 | hidnplayr | 514 | |
515 | ;---------------------------- |
||
516 | ; trim any data not in window |
||
517 | |||
518 | ; check for duplicate data at beginning of segment |
||
519 | |||
2390 | hidnplayr | 520 | mov eax, [ebx + TCP_SOCKET.RCV_NXT] |
521 | sub eax, [edx + TCP_header.SequenceNumber] |
||
2942 | hidnplayr | 522 | jle .no_duplicate |
1733 | hidnplayr | 523 | |
2891 | hidnplayr | 524 | DEBUGF 1,"TCP_input: %u bytes duplicate data!\n", eax |
1763 | hidnplayr | 525 | |
2390 | hidnplayr | 526 | test [edx + TCP_header.Flags], TH_SYN |
527 | jz .no_dup_syn |
||
1733 | hidnplayr | 528 | |
2942 | hidnplayr | 529 | DEBUGF 1,"TCP_input: got duplicate syn\n" |
1733 | hidnplayr | 530 | |
2390 | hidnplayr | 531 | and [edx + TCP_header.Flags], not (TH_SYN) |
532 | inc [edx + TCP_header.SequenceNumber] |
||
1733 | hidnplayr | 533 | |
2390 | hidnplayr | 534 | cmp [edx + TCP_header.UrgentPointer], 1 |
535 | jbe @f |
||
536 | dec [edx + TCP_header.UrgentPointer] |
||
537 | jmp .dup_syn |
||
1733 | hidnplayr | 538 | @@: |
2390 | hidnplayr | 539 | and [edx + TCP_header.Flags], not (TH_URG) |
1838 | hidnplayr | 540 | .dup_syn: |
2390 | hidnplayr | 541 | dec eax |
1763 | hidnplayr | 542 | .no_dup_syn: |
1733 | hidnplayr | 543 | |
2937 | hidnplayr | 544 | ; Check for entire duplicate segment |
545 | cmp eax, ecx ; eax holds number of bytes to drop, ecx is data size |
||
546 | jb .duplicate |
||
547 | jnz @f |
||
2390 | hidnplayr | 548 | test [edx + TCP_header.Flags], TH_FIN |
2937 | hidnplayr | 549 | jnz .duplicate |
550 | @@: |
||
1733 | hidnplayr | 551 | |
2937 | hidnplayr | 552 | ; Any valid FIN must be to the left of the window. |
553 | ; At this point the FIN must be out of sequence or a duplicate, drop it |
||
2390 | hidnplayr | 554 | and [edx + TCP_header.Flags], not TH_FIN |
2937 | hidnplayr | 555 | |
556 | ; send an ACK and resynchronize and drop any data. |
||
557 | ; But keep on processing for RST or ACK |
||
2390 | hidnplayr | 558 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
2937 | hidnplayr | 559 | mov eax, ecx |
560 | ;TODO: update stats |
||
1733 | hidnplayr | 561 | |
562 | ;----------------------------------------------- |
||
563 | ; Remove duplicate data and update urgent offset |
||
564 | |||
2937 | hidnplayr | 565 | .duplicate: |
566 | ;;; TODO: 677 |
||
2390 | hidnplayr | 567 | add [edx + TCP_header.SequenceNumber], eax |
2937 | hidnplayr | 568 | sub ecx, eax |
1733 | hidnplayr | 569 | |
2390 | hidnplayr | 570 | sub [edx + TCP_header.UrgentPointer], ax |
2942 | hidnplayr | 571 | jg @f |
2390 | hidnplayr | 572 | and [edx + TCP_header.Flags], not (TH_URG) |
573 | mov [edx + TCP_header.UrgentPointer], 0 |
||
1733 | hidnplayr | 574 | @@: |
575 | |||
576 | ;-------------------------------------------------- |
||
577 | ; Handle data that arrives after process terminates |
||
578 | |||
2937 | hidnplayr | 579 | .no_duplicate: |
2390 | hidnplayr | 580 | cmp [ebx + SOCKET.PID], 0 |
2937 | hidnplayr | 581 | jne .not_terminated |
2390 | hidnplayr | 582 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
2937 | hidnplayr | 583 | jbe .not_terminated |
2390 | hidnplayr | 584 | test ecx, ecx |
2937 | hidnplayr | 585 | jz .not_terminated |
1733 | hidnplayr | 586 | |
2937 | hidnplayr | 587 | mov eax, ebx |
588 | call TCP_close |
||
589 | ;;;TODO: update stats |
||
2390 | hidnplayr | 590 | jmp .drop_with_reset |
1733 | hidnplayr | 591 | |
592 | ;---------------------------------------- |
||
2937 | hidnplayr | 593 | ; Remove data beyond right edge of window (700-736) |
1733 | hidnplayr | 594 | |
2937 | hidnplayr | 595 | .not_terminated: |
2390 | hidnplayr | 596 | mov eax, [edx + TCP_header.SequenceNumber] |
597 | add eax, ecx |
||
598 | sub eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
2957 | hidnplayr | 599 | sub eax, [ebx + TCP_SOCKET.RCV_WND] ; eax now holds the number of bytes to drop |
2942 | hidnplayr | 600 | jle .no_excess_data |
1733 | hidnplayr | 601 | |
2942 | hidnplayr | 602 | DEBUGF 1,"%d bytes beyond right edge of window\n", eax |
603 | |||
1733 | hidnplayr | 604 | ;;; TODO: update stats |
2390 | hidnplayr | 605 | cmp eax, ecx |
2942 | hidnplayr | 606 | jl .dont_drop_all |
2937 | hidnplayr | 607 | ; If a new connection request is received while in TIME_WAIT, drop the old connection and start over, |
608 | ; if the sequence numbers are above the previous ones |
||
1733 | hidnplayr | 609 | |
2937 | hidnplayr | 610 | test [edx + TCP_header.Flags], TH_SYN |
611 | jz .no_new_request |
||
612 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
613 | jne .no_new_request |
||
2942 | hidnplayr | 614 | ; mov edx, [ebx + TCP_SOCKET.RCV_NXT] |
615 | ; cmp edx, [edx + TCP_header.SequenceNumber] |
||
616 | ; add edx, 64000 ; TCP_ISSINCR FIXME |
||
2937 | hidnplayr | 617 | mov eax, ebx |
618 | call TCP_close |
||
619 | jmp .findpcb ; FIXME: skip code for unscaling window, ... |
||
620 | .no_new_request: |
||
1733 | hidnplayr | 621 | |
2937 | hidnplayr | 622 | ; If window is closed can only take segments at window edge, and have to drop data and PUSH from |
623 | ; incoming segments. Continue processing, but remember to ACK. Otherwise drop segment and ACK |
||
624 | |||
625 | cmp [ebx + TCP_SOCKET.RCV_WND], 0 |
||
626 | jne .drop_after_ack |
||
627 | mov eax, [edx + TCP_header.SequenceNumber] |
||
628 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
629 | jne .drop_after_ack |
||
630 | |||
631 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
632 | ;;; TODO: update stats |
||
633 | jmp .no_excess_data |
||
1733 | hidnplayr | 634 | .dont_drop_all: |
2937 | hidnplayr | 635 | ;;; TODO: update stats |
636 | ;;; TODO: 733 |
||
2957 | hidnplayr | 637 | |
2937 | hidnplayr | 638 | sub ecx, eax |
639 | and [ebx + TCP_SOCKET.t_flags], not (TH_PUSH or TH_FIN) |
||
1733 | hidnplayr | 640 | .no_excess_data: |
641 | |||
2957 | hidnplayr | 642 | ;--------------------- FIXME ------------------- |
643 | |||
644 | pusha |
||
645 | movzx esi, [edx + TCP_header.DataOffset] |
||
646 | add esi, edx |
||
647 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
648 | call SOCKET_ring_write ; Add the data to the socket buffer |
||
649 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
||
650 | popa |
||
651 | |||
652 | ;--------------------- FIXME -------------------- |
||
653 | |||
1733 | hidnplayr | 654 | ;----------------- |
2948 | hidnplayr | 655 | ; Record timestamp (737-746) |
1733 | hidnplayr | 656 | |
2937 | hidnplayr | 657 | ; If last ACK falls within this segments sequence numbers, record its timestamp |
658 | test [ebx + TCP_SOCKET.temp_bits], TCP_BIT_TIMESTAMP |
||
659 | jz .no_timestamp |
||
660 | mov eax, [ebx + TCP_SOCKET.last_ack_sent] |
||
661 | sub eax, [edx + TCP_header.SequenceNumber] |
||
662 | jb .no_timestamp |
||
663 | test [ebx + TCP_header.Flags], TH_SYN or TH_FIN ; syn and fin occupy one byte |
||
664 | jz @f |
||
665 | dec eax |
||
666 | @@: |
||
667 | sub eax, ecx |
||
668 | jae .no_timestamp |
||
1733 | hidnplayr | 669 | |
2948 | hidnplayr | 670 | DEBUGF 1,"Recording timestamp\n" |
671 | |||
672 | mov eax, [esp + 4+4] ; tcp_now |
||
2937 | hidnplayr | 673 | mov [ebx + TCP_SOCKET.ts_recent_age], eax |
674 | mov eax, [ebx + TCP_SOCKET.ts_val] |
||
675 | mov [ebx + TCP_SOCKET.ts_recent], eax |
||
676 | .no_timestamp: |
||
1733 | hidnplayr | 677 | |
678 | ;------------------ |
||
679 | ; Process RST flags |
||
680 | |||
2390 | hidnplayr | 681 | test [edx + TCP_header.Flags], TH_RST |
2891 | hidnplayr | 682 | jz .no_rst |
1733 | hidnplayr | 683 | |
2891 | hidnplayr | 684 | DEBUGF 1,"TCP_input: Got an RST flag\n" |
1733 | hidnplayr | 685 | |
2390 | hidnplayr | 686 | mov eax, [ebx + TCP_SOCKET.t_state] |
687 | shl eax, 2 |
||
688 | jmp dword [eax + .rst_sw_list] |
||
1733 | hidnplayr | 689 | |
690 | .rst_sw_list: |
||
2891 | hidnplayr | 691 | dd .no_rst ; TCPS_CLOSED |
692 | dd .no_rst ; TCPS_LISTEN |
||
693 | dd .no_rst ; TCPS_SYN_SENT |
||
694 | dd .econnrefused ; TCPS_SYN_RECEIVED |
||
695 | dd .econnreset ; TCPS_ESTABLISHED |
||
696 | dd .econnreset ; TCPS_CLOSE_WAIT |
||
697 | dd .econnreset ; TCPS_FIN_WAIT_1 |
||
698 | dd .rst_close ; TCPS_CLOSING |
||
699 | dd .rst_close ; TCPS_LAST_ACK |
||
700 | dd .econnreset ; TCPS_FIN_WAIT_2 |
||
701 | dd .rst_close ; TCPS_TIMED_WAIT |
||
1733 | hidnplayr | 702 | |
703 | .econnrefused: |
||
2891 | hidnplayr | 704 | DEBUGF 1,"TCP_input: Connection refused\n" |
1733 | hidnplayr | 705 | |
2390 | hidnplayr | 706 | mov [ebx + SOCKET.errorcode], ECONNREFUSED |
707 | jmp .close |
||
1733 | hidnplayr | 708 | |
709 | .econnreset: |
||
2891 | hidnplayr | 710 | DEBUGF 1,"TCP_input: Connection reset\n" |
1733 | hidnplayr | 711 | |
2390 | hidnplayr | 712 | mov [ebx + SOCKET.errorcode], ECONNRESET |
1733 | hidnplayr | 713 | |
2882 | hidnplayr | 714 | .close: |
2891 | hidnplayr | 715 | DEBUGF 1,"TCP_input: Closing connection\n" |
1733 | hidnplayr | 716 | |
2390 | hidnplayr | 717 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
2937 | hidnplayr | 718 | ;;; TODO: update stats (tcp drops) |
2390 | hidnplayr | 719 | mov eax, ebx |
720 | call TCP_close |
||
721 | jmp .drop |
||
1733 | hidnplayr | 722 | |
723 | .rst_close: |
||
2891 | hidnplayr | 724 | DEBUGF 1,"TCP_input: Closing with reset\n" |
1733 | hidnplayr | 725 | |
2390 | hidnplayr | 726 | mov eax, ebx |
727 | call TCP_close |
||
728 | jmp .drop |
||
1733 | hidnplayr | 729 | |
2891 | hidnplayr | 730 | .no_rst: |
1733 | hidnplayr | 731 | |
732 | ;-------------------------------------- |
||
733 | ; handle SYN-full and ACK-less segments |
||
734 | |||
2390 | hidnplayr | 735 | test [edx + TCP_header.Flags], TH_SYN |
2937 | hidnplayr | 736 | jz .not_syn_full |
1733 | hidnplayr | 737 | |
2390 | hidnplayr | 738 | mov eax, ebx |
739 | mov ebx, ECONNRESET |
||
740 | call TCP_drop |
||
741 | jmp .drop_with_reset |
||
2937 | hidnplayr | 742 | .not_syn_full: |
1733 | hidnplayr | 743 | |
744 | ;--------------- |
||
745 | ; ACK processing |
||
746 | |||
2891 | hidnplayr | 747 | test [edx + TCP_header.Flags], TH_ACK |
748 | jz .drop |
||
749 | |||
2390 | hidnplayr | 750 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
2937 | hidnplayr | 751 | jb .ack_processed ; states: closed, listen, syn_sent |
752 | ja .no_syn_rcv ; established, fin_wait_1, fin_wait_2, close_wait, closing, last_ack, time_wait |
||
1733 | hidnplayr | 753 | |
2891 | hidnplayr | 754 | DEBUGF 1,"TCP_input: state=syn_received\n" |
1733 | hidnplayr | 755 | |
2390 | hidnplayr | 756 | mov eax, [edx + TCP_header.AckNumber] |
757 | cmp [ebx + TCP_SOCKET.SND_UNA], eax |
||
758 | ja .drop_with_reset |
||
759 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
760 | ja .drop_with_reset |
||
1733 | hidnplayr | 761 | |
2309 | hidnplayr | 762 | ;;; TODO: update stats |
763 | |||
2390 | hidnplayr | 764 | mov eax, ebx |
765 | call SOCKET_is_connected |
||
766 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
||
1831 | hidnplayr | 767 | |
768 | ; Do window scaling? |
||
769 | |||
2390 | hidnplayr | 770 | test [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
771 | jz @f |
||
772 | test [ebx + TCP_SOCKET.t_flags], TF_REQ_SCALE |
||
773 | jz @f |
||
1831 | hidnplayr | 774 | |
2390 | hidnplayr | 775 | push word [ebx + TCP_SOCKET.requested_s_scale] ; Set send and receive scale factors to the received values |
776 | pop word [ebx + TCP_SOCKET.SND_SCALE] |
||
1831 | hidnplayr | 777 | @@: |
778 | |||
2891 | hidnplayr | 779 | ;;; TODO: call TCP_reassemble |
1831 | hidnplayr | 780 | |
2390 | hidnplayr | 781 | mov eax, [edx + TCP_header.SequenceNumber] |
782 | dec eax |
||
783 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
1831 | hidnplayr | 784 | |
1733 | hidnplayr | 785 | .no_syn_rcv: |
786 | |||
2937 | hidnplayr | 787 | ;------------------------- |
788 | ; check for duplicate ACKs |
||
1733 | hidnplayr | 789 | |
2390 | hidnplayr | 790 | mov eax, [edx + TCP_header.AckNumber] |
791 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
792 | ja .not_dup_ack |
||
1733 | hidnplayr | 793 | |
2390 | hidnplayr | 794 | test ecx, ecx |
795 | jnz .reset_dupacks |
||
1733 | hidnplayr | 796 | |
2390 | hidnplayr | 797 | mov eax, dword [edx + TCP_header.Window] |
798 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
799 | jne .reset_dupacks |
||
1733 | hidnplayr | 800 | |
2891 | hidnplayr | 801 | DEBUGF 1,"TCP_input: Processing duplicate ACK\n" |
1733 | hidnplayr | 802 | |
2948 | hidnplayr | 803 | ; If we have outstanding data, other than a window probe, this is a completely duplicate ACK |
2937 | hidnplayr | 804 | ; (window info didnt change) The ACK is the biggest we've seen and we've seen exactly our rexmt threshold of them, |
805 | ; assume a packet has been dropped and retransmit it. Kludge snd_nxt & the congestion window so we send only this one packet. |
||
1733 | hidnplayr | 806 | |
2937 | hidnplayr | 807 | cmp [ebx + TCP_SOCKET.timer_retransmission], 0 ;;;; FIXME |
808 | jg @f |
||
809 | |||
2390 | hidnplayr | 810 | mov eax, [edx + TCP_header.AckNumber] |
811 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
812 | je .dup_ack |
||
1763 | hidnplayr | 813 | |
814 | @@: |
||
2390 | hidnplayr | 815 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
816 | jmp .not_dup_ack |
||
1763 | hidnplayr | 817 | |
818 | .dup_ack: |
||
2390 | hidnplayr | 819 | inc [ebx + TCP_SOCKET.t_dupacks] |
820 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
||
821 | jne .no_re_xmit |
||
1763 | hidnplayr | 822 | |
2390 | hidnplayr | 823 | push [ebx + TCP_SOCKET.SND_NXT] ; >>>> |
1763 | hidnplayr | 824 | |
2390 | hidnplayr | 825 | mov eax, [ebx + TCP_SOCKET.SND_WND] |
826 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
||
2866 | hidnplayr | 827 | cmova eax, [ebx + TCP_SOCKET.SND_CWND] |
2390 | hidnplayr | 828 | shr eax, 1 |
829 | push edx |
||
830 | xor edx, edx |
||
831 | div [ebx + TCP_SOCKET.t_maxseg] |
||
832 | cmp eax, 2 |
||
2937 | hidnplayr | 833 | ja @f |
834 | xor eax, eax |
||
835 | mov al, 2 |
||
1763 | hidnplayr | 836 | @@: |
2390 | hidnplayr | 837 | mul [ebx + TCP_SOCKET.t_maxseg] |
838 | pop edx |
||
839 | mov [ebx + TCP_SOCKET.SND_SSTHRESH], eax |
||
1763 | hidnplayr | 840 | |
2390 | hidnplayr | 841 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 ; turn off retransmission timer |
842 | mov [ebx + TCP_SOCKET.t_rtt], 0 |
||
843 | mov eax, [edx + TCP_header.AckNumber] |
||
844 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
845 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
846 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
1763 | hidnplayr | 847 | |
2390 | hidnplayr | 848 | mov eax, ebx |
849 | call TCP_output ; retransmit missing segment |
||
1763 | hidnplayr | 850 | |
2390 | hidnplayr | 851 | push edx |
852 | xor edx, edx |
||
853 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
854 | mul [ebx + TCP_SOCKET.t_dupacks] |
||
855 | pop edx |
||
856 | add eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
||
857 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
1763 | hidnplayr | 858 | |
2390 | hidnplayr | 859 | pop eax ; <<<< |
860 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
861 | jb @f |
||
862 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1763 | hidnplayr | 863 | @@: |
864 | |||
2390 | hidnplayr | 865 | jmp .drop |
1733 | hidnplayr | 866 | |
867 | |||
1763 | hidnplayr | 868 | .no_re_xmit: |
2390 | hidnplayr | 869 | jbe .not_dup_ack |
1733 | hidnplayr | 870 | |
2891 | hidnplayr | 871 | DEBUGF 1,"TCP_input: Increasing congestion window\n" |
1733 | hidnplayr | 872 | |
2390 | hidnplayr | 873 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
874 | add [ebx + TCP_SOCKET.SND_CWND], eax |
||
1733 | hidnplayr | 875 | |
2390 | hidnplayr | 876 | mov eax, ebx |
877 | call TCP_output |
||
1733 | hidnplayr | 878 | |
2390 | hidnplayr | 879 | jmp .drop |
1733 | hidnplayr | 880 | |
881 | |||
1763 | hidnplayr | 882 | .not_dup_ack: |
883 | |||
1733 | hidnplayr | 884 | ;------------------------------------------------- |
885 | ; If the congestion window was inflated to account |
||
886 | ; for the other side's cached packets, retract it |
||
887 | |||
2390 | hidnplayr | 888 | mov eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
889 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
||
890 | ja @f |
||
891 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
||
892 | jbe @f |
||
893 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
1763 | hidnplayr | 894 | @@: |
1733 | hidnplayr | 895 | |
2390 | hidnplayr | 896 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
1733 | hidnplayr | 897 | |
2390 | hidnplayr | 898 | mov eax, [edx + TCP_header.AckNumber] |
899 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
900 | jbe @f |
||
1733 | hidnplayr | 901 | |
2390 | hidnplayr | 902 | ;;; TODO: update stats |
903 | jmp .drop_after_ack |
||
1733 | hidnplayr | 904 | |
1763 | hidnplayr | 905 | @@: |
1733 | hidnplayr | 906 | |
2390 | hidnplayr | 907 | mov edi, [edx + TCP_header.AckNumber] |
908 | sub edi, [ebx + TCP_SOCKET.SND_UNA] ; now we got the number of acked bytes in edi |
||
1733 | hidnplayr | 909 | |
2390 | hidnplayr | 910 | ;;; TODO: update stats |
1733 | hidnplayr | 911 | |
2891 | hidnplayr | 912 | DEBUGF 1,"TCP_input: acceptable ACK for %u bytes\n", edi |
1763 | hidnplayr | 913 | |
1733 | hidnplayr | 914 | ;------------------------------------------ |
2937 | hidnplayr | 915 | ; RTT measurements and retransmission timer (912-926) |
1733 | hidnplayr | 916 | |
2937 | hidnplayr | 917 | ; If we have a timestamp, update smoothed RTT |
1733 | hidnplayr | 918 | |
2937 | hidnplayr | 919 | test [ebx + TCP_SOCKET.temp_bits], TCP_BIT_TIMESTAMP |
2948 | hidnplayr | 920 | jz .timestamp_not_present |
2942 | hidnplayr | 921 | mov eax, [esp+4+4] |
2937 | hidnplayr | 922 | sub eax, [ebx + TCP_SOCKET.ts_ecr] |
923 | inc eax |
||
924 | call TCP_xmit_timer |
||
925 | jmp .rtt_done_ |
||
1733 | hidnplayr | 926 | |
2937 | hidnplayr | 927 | ; If no timestamp but transmit timer is running and timed sequence number was acked, |
928 | ; update smoothed RTT. Since we now have an RTT measurement, cancel the timer backoff |
||
929 | ; (Phil Karn's retransmit algo) |
||
930 | ; Recompute the initial retransmit timer |
||
931 | |||
932 | .timestamp_not_present: |
||
933 | mov eax, [edx + TCP_header.AckNumber] |
||
934 | cmp eax, [ebx + TCP_SOCKET.t_rtseq] |
||
935 | jbe .rtt_done_ |
||
936 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
||
937 | test eax, eax |
||
938 | jz .rtt_done_ |
||
939 | call TCP_xmit_timer |
||
940 | |||
941 | .rtt_done_: |
||
942 | |||
943 | ; If all outstanding data is acked, stop retransmit timer and remember to restart (more output or persist) |
||
944 | ; If there is more data to be acked, restart retransmit timer, using current (possible backed-off) value. |
||
945 | |||
2390 | hidnplayr | 946 | mov eax, [ebx + TCP_SOCKET.SND_MAX] |
947 | cmp eax, [edx + TCP_header.AckNumber] |
||
2937 | hidnplayr | 948 | jne .more_data |
949 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 |
||
950 | or [ebx + TCP_SOCKET.temp_bits], TCP_BIT_NEEDOUTPUT |
||
951 | jmp .no_restart |
||
952 | .more_data: |
||
953 | cmp [ebx + TCP_SOCKET.timer_persist], 0 |
||
954 | jne .no_restart |
||
2891 | hidnplayr | 955 | |
2937 | hidnplayr | 956 | mov eax, [ebx + TCP_SOCKET.t_rxtcur] |
2955 | hidnplayr | 957 | mov [ebx + TCP_SOCKET.timer_retransmission], eax |
1733 | hidnplayr | 958 | |
2937 | hidnplayr | 959 | .no_restart: |
960 | |||
961 | |||
1733 | hidnplayr | 962 | ;------------------------------------------- |
963 | ; Open congestion window in response to ACKs |
||
964 | |||
2390 | hidnplayr | 965 | mov esi, [ebx + TCP_SOCKET.SND_CWND] |
966 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
1733 | hidnplayr | 967 | |
2390 | hidnplayr | 968 | cmp esi, [ebx + TCP_SOCKET.SND_SSTHRESH] |
969 | jbe @f |
||
970 | push edx |
||
971 | push eax |
||
972 | mul eax |
||
973 | div esi |
||
974 | pop edx |
||
975 | shr edx, 3 |
||
976 | add eax, edx |
||
977 | pop edx |
||
1763 | hidnplayr | 978 | @@: |
1733 | hidnplayr | 979 | |
2390 | hidnplayr | 980 | add esi, eax |
1733 | hidnplayr | 981 | |
2390 | hidnplayr | 982 | push ecx |
983 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
||
984 | mov eax, TCP_max_win |
||
985 | shl eax, cl |
||
986 | pop ecx |
||
1733 | hidnplayr | 987 | |
2390 | hidnplayr | 988 | cmp esi, eax |
2866 | hidnplayr | 989 | cmova esi, eax |
2390 | hidnplayr | 990 | mov [ebx + TCP_SOCKET.SND_CWND], esi |
1733 | hidnplayr | 991 | |
2891 | hidnplayr | 992 | ;------------------------------------------ |
993 | ; Remove acknowledged data from send buffer |
||
1733 | hidnplayr | 994 | |
2891 | hidnplayr | 995 | cmp edi, [ebx + STREAM_SOCKET.snd.size] |
996 | jbe .finiacked |
||
1733 | hidnplayr | 997 | |
2891 | hidnplayr | 998 | push ecx edx ebx |
999 | mov ecx, [ebx + STREAM_SOCKET.snd.size] |
||
1000 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1001 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
||
1002 | call SOCKET_ring_free |
||
1003 | pop ebx edx ecx |
||
1733 | hidnplayr | 1004 | |
2891 | hidnplayr | 1005 | DEBUGF 1,"TCP_input: our FIN is acked\n" |
1006 | stc |
||
1763 | hidnplayr | 1007 | |
2891 | hidnplayr | 1008 | jmp .wakeup |
1763 | hidnplayr | 1009 | |
2891 | hidnplayr | 1010 | .finiacked: |
1763 | hidnplayr | 1011 | |
2390 | hidnplayr | 1012 | push ecx edx ebx |
1013 | mov ecx, edi |
||
1014 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1015 | call SOCKET_ring_free |
||
1016 | pop ebx |
||
1017 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
||
1018 | pop edx ecx |
||
1733 | hidnplayr | 1019 | |
2891 | hidnplayr | 1020 | DEBUGF 1,"TCP_input: our FIN is not acked\n" |
1021 | clc |
||
1022 | |||
1023 | ;---------------------------------------- |
||
1733 | hidnplayr | 1024 | ; Wake up process waiting on send buffer |
1025 | |||
2891 | hidnplayr | 1026 | .wakeup: |
1027 | |||
1028 | pushf |
||
2390 | hidnplayr | 1029 | mov eax, ebx |
1030 | call SOCKET_notify_owner |
||
1733 | hidnplayr | 1031 | |
1831 | hidnplayr | 1032 | ; Update TCPS |
1733 | hidnplayr | 1033 | |
2390 | hidnplayr | 1034 | mov eax, [edx + TCP_header.AckNumber] |
1035 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
1036 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
1037 | jb @f |
||
1038 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1733 | hidnplayr | 1039 | @@: |
1040 | |||
2891 | hidnplayr | 1041 | popf |
1733 | hidnplayr | 1042 | |
1043 | ; General ACK handling complete |
||
1044 | ; Now do the state-specific ones |
||
1045 | |||
2390 | hidnplayr | 1046 | mov eax, [ebx + TCP_SOCKET.t_state] |
1047 | jmp dword [eax*4 + .ACK_sw_list] |
||
1733 | hidnplayr | 1048 | |
1049 | .ACK_sw_list: |
||
2891 | hidnplayr | 1050 | dd .ack_processed ; TCPS_CLOSED |
1051 | dd .ack_processed ; TCPS_LISTEN |
||
1052 | dd .ack_processed ; TCPS_SYN_SENT |
||
1053 | dd .ack_processed ; TCPS_SYN_RECEIVED |
||
1054 | dd .ack_processed ; TCPS_ESTABLISHED |
||
1055 | dd .ack_processed ; TCPS_CLOSE_WAIT |
||
1056 | dd .ack_fw1 ; TCPS_FIN_WAIT_1 |
||
1057 | dd .ack_c ; TCPS_CLOSING |
||
1058 | dd .ack_la ; TCPS_LAST_ACK |
||
1059 | dd .ack_processed ; TCPS_FIN_WAIT_2 |
||
1060 | dd .ack_tw ; TCPS_TIMED_WAIT |
||
1733 | hidnplayr | 1061 | |
1062 | |||
1772 | hidnplayr | 1063 | .ack_fw1: |
2891 | hidnplayr | 1064 | jnc .ack_processed |
1733 | hidnplayr | 1065 | |
2390 | hidnplayr | 1066 | test [ebx + SOCKET.state], SS_CANTRCVMORE |
1067 | jnz @f |
||
1068 | mov eax, ebx |
||
1069 | call SOCKET_is_disconnected |
||
2937 | hidnplayr | 1070 | mov [ebx + TCP_SOCKET.timer_timed_wait], TCP_time_max_idle |
1772 | hidnplayr | 1071 | @@: |
2390 | hidnplayr | 1072 | mov [ebx + TCP_SOCKET.t_state], TCPS_FIN_WAIT_2 |
1073 | jmp .ack_processed |
||
1733 | hidnplayr | 1074 | |
1772 | hidnplayr | 1075 | .ack_c: |
2891 | hidnplayr | 1076 | jnc .ack_processed |
1772 | hidnplayr | 1077 | |
2390 | hidnplayr | 1078 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1079 | mov eax, ebx |
||
1080 | call TCP_cancel_timers |
||
1081 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
1082 | mov eax, ebx |
||
1083 | call SOCKET_is_disconnected |
||
1084 | jmp .ack_processed |
||
1733 | hidnplayr | 1085 | |
1772 | hidnplayr | 1086 | .ack_la: |
2891 | hidnplayr | 1087 | jnc .ack_processed |
1733 | hidnplayr | 1088 | |
2390 | hidnplayr | 1089 | mov eax, ebx |
2882 | hidnplayr | 1090 | call TCP_disconnect |
2390 | hidnplayr | 1091 | jmp .drop |
1733 | hidnplayr | 1092 | |
1772 | hidnplayr | 1093 | .ack_tw: |
2390 | hidnplayr | 1094 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
1095 | jmp .drop_after_ack |
||
1733 | hidnplayr | 1096 | |
2930 | hidnplayr | 1097 | .reset_dupacks: ; We got a new ACK, reset duplicate ACK counter |
1098 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
||
1099 | jmp .ack_processed |
||
1733 | hidnplayr | 1100 | |
1772 | hidnplayr | 1101 | |
1733 | hidnplayr | 1102 | |
1103 | |||
2930 | hidnplayr | 1104 | |
1105 | |||
1106 | .LISTEN: |
||
1107 | |||
1108 | DEBUGF 1,"TCP_input: state=listen\n" |
||
1109 | |||
2937 | hidnplayr | 1110 | test [edx + TCP_header.Flags], TH_RST |
2930 | hidnplayr | 1111 | jnz .drop |
1112 | |||
1113 | test [edx + TCP_header.Flags], TH_ACK |
||
1114 | jnz .drop_with_reset |
||
1115 | |||
1116 | test [edx + TCP_header.Flags], TH_SYN |
||
1117 | jz .drop |
||
1118 | |||
1119 | ;;; TODO: check if it's a broadcast or multicast, and drop if so |
||
1120 | |||
1121 | push dword [edi] ; Ipv4 source addres |
||
1122 | pop [ebx + IP_SOCKET.RemoteIP] |
||
1123 | |||
1124 | push [edx + TCP_header.SourcePort] |
||
1125 | pop [ebx + TCP_SOCKET.RemotePort] |
||
1126 | |||
1127 | push [edx + TCP_header.SequenceNumber] |
||
1128 | pop [ebx + TCP_SOCKET.IRS] |
||
1129 | |||
1130 | mov eax, [TCP_sequence_num] |
||
1131 | add [TCP_sequence_num], 64000 / 2 |
||
1132 | mov [ebx + TCP_SOCKET.ISS], eax |
||
1133 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1134 | |||
1135 | TCP_sendseqinit ebx |
||
1136 | TCP_rcvseqinit ebx |
||
1137 | |||
1138 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
||
1139 | mov [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1140 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval ;;;; macro |
||
1141 | |||
1142 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1143 | call SOCKET_ring_create |
||
1144 | |||
1145 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
1146 | call SOCKET_ring_create |
||
1147 | |||
2937 | hidnplayr | 1148 | and [ebx + TCP_SOCKET.temp_bits], not TCP_BIT_DROPSOCKET |
1149 | |||
2930 | hidnplayr | 1150 | ;;; call SOCKET_notify_owner |
1151 | |||
1152 | jmp .trim_then_step6 |
||
1153 | |||
1154 | |||
1155 | |||
1156 | |||
1157 | |||
1158 | |||
1159 | |||
1160 | |||
1161 | |||
1162 | |||
1163 | ;------------ |
||
1164 | ; Active Open |
||
1165 | |||
1166 | align 4 |
||
2937 | hidnplayr | 1167 | .SYN_SENT: |
2930 | hidnplayr | 1168 | |
1169 | DEBUGF 1,"TCP_input: state=syn_sent\n" |
||
1170 | |||
1171 | test [edx + TCP_header.Flags], TH_ACK |
||
1172 | jz @f |
||
1173 | |||
1174 | mov eax, [edx + TCP_header.AckNumber] |
||
1175 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
1176 | jbe .drop_with_reset |
||
1177 | |||
1178 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
1179 | ja .drop_with_reset |
||
1180 | @@: |
||
1181 | |||
1182 | test [edx + TCP_header.Flags], TH_RST |
||
1183 | jz @f |
||
1184 | |||
1185 | test [edx + TCP_header.Flags], TH_ACK |
||
1186 | jz .drop |
||
1187 | |||
1188 | mov eax, ebx |
||
1189 | mov ebx, ECONNREFUSED |
||
1190 | call TCP_drop |
||
1191 | |||
1192 | jmp .drop |
||
1193 | @@: |
||
1194 | |||
1195 | test [edx + TCP_header.Flags], TH_SYN |
||
1196 | jz .drop |
||
1197 | |||
1198 | ; at this point, segment seems to be valid |
||
1199 | |||
1200 | test [edx + TCP_header.Flags], TH_ACK |
||
1201 | jz .no_syn_ack |
||
1202 | |||
1203 | ; now, process received SYN in response to an active open |
||
1204 | |||
1205 | mov eax, [edx + TCP_header.AckNumber] |
||
1206 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
1207 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
1208 | jbe @f |
||
1209 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1210 | @@: |
||
1211 | |||
1212 | .no_syn_ack: |
||
1213 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 ; disable retransmission |
||
1214 | |||
1215 | push [edx + TCP_header.SequenceNumber] |
||
1216 | pop [ebx + TCP_SOCKET.IRS] |
||
1217 | |||
1218 | TCP_rcvseqinit ebx |
||
1219 | |||
1220 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1221 | |||
1222 | mov eax, [ebx + TCP_SOCKET.SND_UNA] |
||
1223 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
1224 | jbe .simultaneous_open |
||
1225 | |||
1226 | test [edx + TCP_header.Flags], TH_ACK |
||
1227 | jz .simultaneous_open |
||
1228 | |||
1229 | DEBUGF 1,"TCP_input: active open\n" |
||
1230 | |||
1231 | ;;; TODO: update stats |
||
1232 | |||
1233 | ; set socket state to connected |
||
1234 | mov [ebx + SOCKET.state], SS_ISCONNECTED |
||
1235 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
||
1236 | |||
2937 | hidnplayr | 1237 | ; Do window scaling on this connection ? |
1238 | mov eax, [ebx + TCP_SOCKET.t_flags] |
||
1239 | and eax, TF_REQ_SCALE or TF_RCVD_SCALE |
||
1240 | cmp eax, TF_REQ_SCALE or TF_RCVD_SCALE |
||
1241 | jne .no_scaling |
||
2930 | hidnplayr | 1242 | |
2937 | hidnplayr | 1243 | mov ax, word [ebx + TCP_SOCKET.requested_s_scale] |
1244 | mov word [ebx + TCP_SOCKET.SND_SCALE], ax |
||
1245 | .no_scaling: |
||
2930 | hidnplayr | 1246 | |
2937 | hidnplayr | 1247 | ;;; TODO: reassemble packets queue |
1248 | |||
1249 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
||
1250 | test eax, eax |
||
1251 | je .trim_then_step6 |
||
1252 | call TCP_xmit_timer |
||
2930 | hidnplayr | 1253 | jmp .trim_then_step6 |
1254 | |||
1255 | .simultaneous_open: |
||
1256 | |||
1257 | DEBUGF 1,"TCP_input: simultaneous open\n" |
||
1258 | ; We have received a syn but no ACK, so we are having a simultaneous open.. |
||
1259 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
||
1260 | |||
1261 | ;------------------------------------- |
||
1262 | ; Common processing for receipt of SYN |
||
1263 | |||
1264 | .trim_then_step6: |
||
1265 | |||
1266 | inc [edx + TCP_header.SequenceNumber] |
||
1267 | |||
1268 | ;;; TODO: Drop any received data that follows receive window (590) |
||
1269 | |||
1270 | mov eax, [edx + TCP_header.SequenceNumber] |
||
1271 | mov [ebx + TCP_SOCKET.RCV_UP], eax |
||
1272 | dec eax |
||
1273 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
1274 | |||
1275 | |||
1276 | |||
2390 | hidnplayr | 1277 | .ack_processed: ; (step 6) |
1733 | hidnplayr | 1278 | |
2891 | hidnplayr | 1279 | DEBUGF 1,"TCP_input: ACK processed\n" |
1733 | hidnplayr | 1280 | |
1281 | ;---------------------------------------------- |
||
1282 | ; check if we need to update window information |
||
1283 | |||
2390 | hidnplayr | 1284 | test [edx + TCP_header.Flags], TH_ACK |
1285 | jz .no_window_update |
||
1733 | hidnplayr | 1286 | |
2390 | hidnplayr | 1287 | mov eax, [ebx + TCP_SOCKET.SND_WL1] |
1288 | cmp eax, [edx + TCP_header.SequenceNumber] |
||
1289 | jb .update_window |
||
1290 | ja @f |
||
1733 | hidnplayr | 1291 | |
2390 | hidnplayr | 1292 | mov eax, [ebx + TCP_SOCKET.SND_WL2] |
1293 | cmp eax, [edx + TCP_header.AckNumber] |
||
1294 | jb .update_window |
||
1295 | ja .no_window_update |
||
1733 | hidnplayr | 1296 | @@: |
1297 | |||
2390 | hidnplayr | 1298 | mov eax, dword [edx + TCP_header.Window] |
1299 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
1300 | jbe .no_window_update |
||
1733 | hidnplayr | 1301 | |
1302 | .update_window: |
||
1303 | |||
2954 | hidnplayr | 1304 | ;;; TODO: update stats (Keep track of pure window updates) |
1733 | hidnplayr | 1305 | |
2390 | hidnplayr | 1306 | mov eax, dword [edx + TCP_header.Window] |
1307 | cmp eax, [ebx + TCP_SOCKET.max_sndwnd] |
||
1308 | jbe @f |
||
1309 | mov [ebx + TCP_SOCKET.max_sndwnd], eax |
||
1733 | hidnplayr | 1310 | @@: |
2390 | hidnplayr | 1311 | mov [ebx + TCP_SOCKET.SND_WND], eax |
1733 | hidnplayr | 1312 | |
2891 | hidnplayr | 1313 | DEBUGF 1,"TCP_input: Updating window to %u\n", eax |
2612 | hidnplayr | 1314 | |
2390 | hidnplayr | 1315 | push [edx + TCP_header.SequenceNumber] |
1316 | pop [ebx + TCP_SOCKET.SND_WL1] |
||
1733 | hidnplayr | 1317 | |
2390 | hidnplayr | 1318 | push [edx + TCP_header.AckNumber] |
1319 | pop [ebx + TCP_SOCKET.SND_WL2] |
||
1733 | hidnplayr | 1320 | |
2937 | hidnplayr | 1321 | or [ebx + TCP_SOCKET.temp_bits], TCP_BIT_NEEDOUTPUT |
1733 | hidnplayr | 1322 | |
1323 | .no_window_update: |
||
1324 | |||
1325 | ;----------------- |
||
1326 | ; process URG flag |
||
1327 | |||
2390 | hidnplayr | 1328 | test [edx + TCP_header.Flags], TH_URG |
1329 | jz .not_urgent |
||
1733 | hidnplayr | 1330 | |
2390 | hidnplayr | 1331 | cmp [edx + TCP_header.UrgentPointer], 0 |
1332 | jz .not_urgent |
||
1733 | hidnplayr | 1333 | |
2390 | hidnplayr | 1334 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1335 | je .not_urgent |
||
1733 | hidnplayr | 1336 | |
1337 | ; Ignore bogus urgent offsets |
||
1338 | |||
2390 | hidnplayr | 1339 | movzx eax, [edx + TCP_header.UrgentPointer] |
1340 | add eax, [ebx + STREAM_SOCKET.rcv.size] |
||
1341 | cmp eax, SOCKET_MAXDATA |
||
1342 | jbe .not_urgent |
||
1733 | hidnplayr | 1343 | |
2390 | hidnplayr | 1344 | mov [edx + TCP_header.UrgentPointer], 0 |
1345 | and [edx + TCP_header.Flags], not (TH_URG) |
||
1346 | jmp .do_data |
||
1733 | hidnplayr | 1347 | |
1348 | .not_urgent: |
||
1349 | |||
1350 | ; processing of received urgent pointer |
||
1351 | |||
2390 | hidnplayr | 1352 | ;;; TODO (1051-1093) |
1733 | hidnplayr | 1353 | |
1354 | |||
2891 | hidnplayr | 1355 | ;--------------------------------------- |
1356 | ; process the data in the segment (1094) |
||
1733 | hidnplayr | 1357 | |
1358 | .do_data: |
||
1359 | |||
2891 | hidnplayr | 1360 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1361 | jae .final_processing |
||
1733 | hidnplayr | 1362 | |
2390 | hidnplayr | 1363 | test [edx + TCP_header.Flags], TH_FIN |
2891 | hidnplayr | 1364 | jnz @f |
1733 | hidnplayr | 1365 | |
2390 | hidnplayr | 1366 | test ecx, ecx |
2891 | hidnplayr | 1367 | jnz .final_processing |
1368 | @@: |
||
1733 | hidnplayr | 1369 | |
2891 | hidnplayr | 1370 | ; call TCP_reassemble ;;; TODO |
1733 | hidnplayr | 1371 | |
1372 | ;--------------- |
||
1373 | ; FIN processing |
||
1374 | |||
2891 | hidnplayr | 1375 | test [edx + TCP_header.Flags], TH_FIN |
2930 | hidnplayr | 1376 | jz .final_processing |
1733 | hidnplayr | 1377 | |
2891 | hidnplayr | 1378 | DEBUGF 1,"TCP_input: Processing FIN\n" |
1733 | hidnplayr | 1379 | |
2891 | hidnplayr | 1380 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1381 | jae .not_first_fin |
||
1774 | hidnplayr | 1382 | |
2891 | hidnplayr | 1383 | DEBUGF 1,"TCP_input: First FIN for this connection\n" |
1774 | hidnplayr | 1384 | |
2390 | hidnplayr | 1385 | mov eax, ebx |
1386 | call SOCKET_cant_recv_more |
||
1774 | hidnplayr | 1387 | |
2390 | hidnplayr | 1388 | mov [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1389 | inc [ebx + TCP_SOCKET.RCV_NXT] |
||
1774 | hidnplayr | 1390 | |
1391 | .not_first_fin: |
||
2390 | hidnplayr | 1392 | mov eax, [ebx + TCP_SOCKET.t_state] |
1393 | shl eax, 2 |
||
1394 | jmp dword [eax + .FIN_sw_list] |
||
1733 | hidnplayr | 1395 | |
1396 | .FIN_sw_list: |
||
2937 | hidnplayr | 1397 | dd .final_processing ; TCPS_CLOSED |
1398 | dd .final_processing ; TCPS_LISTEN |
||
1399 | dd .final_processing ; TCPS_SYN_SENT |
||
1400 | dd .fin_syn_est ; TCPS_SYN_RECEIVED |
||
1401 | dd .fin_syn_est ; TCPS_ESTABLISHED |
||
1402 | dd .final_processing ; TCPS_CLOSE_WAIT |
||
1403 | dd .fin_wait1 ; TCPS_FIN_WAIT_1 |
||
1404 | dd .final_processing ; TCPS_CLOSING |
||
1405 | dd .final_processing ; TCPS_LAST_ACK |
||
1406 | dd .fin_wait2 ; TCPS_FIN_WAIT_2 |
||
1407 | dd .fin_timed ; TCPS_TIMED_WAIT |
||
1733 | hidnplayr | 1408 | |
1409 | .fin_syn_est: |
||
1410 | |||
2390 | hidnplayr | 1411 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
2930 | hidnplayr | 1412 | jmp .final_processing |
1733 | hidnplayr | 1413 | |
1414 | .fin_wait1: |
||
1415 | |||
2390 | hidnplayr | 1416 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSING |
2930 | hidnplayr | 1417 | jmp .final_processing |
1733 | hidnplayr | 1418 | |
1419 | .fin_wait2: |
||
1420 | |||
2390 | hidnplayr | 1421 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1422 | mov eax, ebx |
||
1423 | call TCP_cancel_timers |
||
1424 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
1425 | call SOCKET_is_disconnected |
||
2930 | hidnplayr | 1426 | jmp .final_processing |
1733 | hidnplayr | 1427 | |
1428 | .fin_timed: |
||
2390 | hidnplayr | 1429 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
2930 | hidnplayr | 1430 | jmp .final_processing |
1733 | hidnplayr | 1431 | |
1432 | |||
2930 | hidnplayr | 1433 | .drop_after_ack: |
1434 | DEBUGF 1,"TCP_input: Drop after ACK\n" |
||
1733 | hidnplayr | 1435 | |
2930 | hidnplayr | 1436 | push edx ebx |
2891 | hidnplayr | 1437 | lea ecx, [ebx + SOCKET.mutex] |
1438 | call mutex_unlock |
||
2930 | hidnplayr | 1439 | pop eax edx |
2891 | hidnplayr | 1440 | |
2930 | hidnplayr | 1441 | test [edx + TCP_header.Flags], TH_RST |
1442 | jnz .dumpit |
||
1733 | hidnplayr | 1443 | |
2930 | hidnplayr | 1444 | or [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
1445 | jmp .need_output |
||
2891 | hidnplayr | 1446 | |
1733 | hidnplayr | 1447 | |
2891 | hidnplayr | 1448 | |
2930 | hidnplayr | 1449 | .drop_with_reset: |
1450 | DEBUGF 1,"TCP_input: Drop with reset\n" |
||
1451 | |||
1452 | push ebx edx |
||
2402 | hidnplayr | 1453 | lea ecx, [ebx + SOCKET.mutex] |
1454 | call mutex_unlock |
||
2930 | hidnplayr | 1455 | pop edx ebx |
1733 | hidnplayr | 1456 | |
2930 | hidnplayr | 1457 | test [edx + TCP_header.Flags], TH_RST |
1458 | jnz .dumpit |
||
1733 | hidnplayr | 1459 | |
2930 | hidnplayr | 1460 | ;;; if its a multicast/broadcast, also drop |
1733 | hidnplayr | 1461 | |
2930 | hidnplayr | 1462 | test [edx + TCP_header.Flags], TH_ACK |
1463 | jnz .respond_ack |
||
1733 | hidnplayr | 1464 | |
2930 | hidnplayr | 1465 | test [edx + TCP_header.Flags], TH_SYN |
1466 | jnz .respond_syn |
||
1467 | jmp .dumpit |
||
1733 | hidnplayr | 1468 | |
2930 | hidnplayr | 1469 | ;----------------- |
1470 | ; Final processing |
||
1733 | hidnplayr | 1471 | |
2930 | hidnplayr | 1472 | .final_processing: |
1473 | DEBUGF 1,"TCP_input: Final processing\n" |
||
1733 | hidnplayr | 1474 | |
2930 | hidnplayr | 1475 | push ebx |
1476 | lea ecx, [ebx + SOCKET.mutex] |
||
1477 | call mutex_unlock |
||
1478 | pop eax |
||
1733 | hidnplayr | 1479 | |
2937 | hidnplayr | 1480 | test [eax + TCP_SOCKET.temp_bits], TCP_BIT_NEEDOUTPUT |
1481 | jnz .need_output |
||
1733 | hidnplayr | 1482 | |
2930 | hidnplayr | 1483 | test [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
1484 | jz .dumpit |
||
1485 | DEBUGF 1,"TCP_input: ACK now!\n" |
||
1733 | hidnplayr | 1486 | |
2930 | hidnplayr | 1487 | .need_output: |
2954 | hidnplayr | 1488 | DEBUGF 1,"TCP_input: need output\n" |
2930 | hidnplayr | 1489 | call TCP_output |
1733 | hidnplayr | 1490 | |
2930 | hidnplayr | 1491 | .dumpit: |
1492 | DEBUGF 1,"TCP_input: dumping\n" |
||
1733 | hidnplayr | 1493 | |
2942 | hidnplayr | 1494 | popf |
2390 | hidnplayr | 1495 | call kernel_free |
1496 | add esp, 4 |
||
2942 | hidnplayr | 1497 | |
2390 | hidnplayr | 1498 | ret |
1733 | hidnplayr | 1499 | |
1500 | |||
1501 | .respond_ack: |
||
2390 | hidnplayr | 1502 | push ebx |
1503 | mov cl, TH_RST |
||
1504 | call TCP_respond_socket |
||
1505 | pop ebx |
||
1506 | jmp .destroy_new_socket |
||
1733 | hidnplayr | 1507 | |
1508 | |||
1509 | .respond_syn: |
||
2390 | hidnplayr | 1510 | push ebx |
1511 | mov cl, TH_RST + TH_ACK |
||
1512 | call TCP_respond_socket |
||
1513 | pop ebx |
||
1514 | jmp .destroy_new_socket |
||
1733 | hidnplayr | 1515 | |
1516 | |||
1517 | |||
1518 | ;----- |
||
1519 | ; Drop |
||
1520 | |||
2930 | hidnplayr | 1521 | .drop: |
1733 | hidnplayr | 1522 | |
2937 | hidnplayr | 1523 | DEBUGF 1,"TCP_input: Dropping packet\n" |
1524 | |||
2402 | hidnplayr | 1525 | pusha |
1526 | lea ecx, [ebx + SOCKET.mutex] |
||
1527 | call mutex_unlock |
||
1528 | popa |
||
1733 | hidnplayr | 1529 | |
2937 | hidnplayr | 1530 | .destroy_new_socket: |
1733 | hidnplayr | 1531 | |
2937 | hidnplayr | 1532 | test [ebx + TCP_SOCKET.temp_bits], TCP_BIT_DROPSOCKET |
1533 | jz .drop_no_socket |
||
1733 | hidnplayr | 1534 | |
2937 | hidnplayr | 1535 | mov eax, ebx |
1536 | call SOCKET_free |
||
1733 | hidnplayr | 1537 | |
2930 | hidnplayr | 1538 | .drop_no_socket: |
1539 | DEBUGF 1,"TCP_input: Drop (no socket)\n" |
||
1540 | |||
2942 | hidnplayr | 1541 | popf |
2390 | hidnplayr | 1542 | call kernel_free |
1543 | add esp, 4 |
||
2942 | hidnplayr | 1544 | |
2600 | hidnplayr | 1545 | ret |
1546 | |||
2930 | hidnplayr | 1547 | .drop_with_reset_no_socket: |
2600 | hidnplayr | 1548 | |
2891 | hidnplayr | 1549 | DEBUGF 1,"TCP_input: Drop with reset (no socket)\n" |
2600 | hidnplayr | 1550 | |
1551 | test [edx + TCP_header.Flags], TH_RST |
||
1552 | jnz .drop_no_socket |
||
1553 | |||
1554 | ;;; if its a multicast/broadcast, also drop |
||
1555 | |||
1556 | test [edx + TCP_header.Flags], TH_ACK |
||
1557 | jnz .respond_seg_ack |
||
1558 | |||
1559 | test [edx + TCP_header.Flags], TH_SYN |
||
1560 | jnz .respond_seg_syn |
||
1561 | |||
2930 | hidnplayr | 1562 | jmp .drop_no_socket |
2600 | hidnplayr | 1563 | |
1564 | .respond_seg_ack: |
||
1565 | |||
1566 | mov cl, TH_RST |
||
1567 | call TCP_respond_segment |
||
1568 | jmp .drop_no_socket |
||
1569 | |||
1570 | .respond_seg_syn: |
||
1571 | |||
1572 | mov cl, TH_RST + TH_ACK |
||
1573 | call TCP_respond_segment |
||
1574 | jmp .drop_no_socket |