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