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