Rev 2930 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
1763 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
||
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 | ;; ;; |
||
6 | ;; Part of the tcp/ip network stack for KolibriOS ;; |
||
7 | ;; ;; |
||
8 | ;; Written by hidnplayr@kolibrios.org ;; |
||
9 | ;; ;; |
||
10 | ;; Based on the code of 4.4BSD ;; |
||
11 | ;; ;; |
||
12 | ;; GNU GENERAL PUBLIC LICENSE ;; |
||
13 | ;; Version 2, June 1991 ;; |
||
14 | ;; ;; |
||
15 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
||
16 | |||
17 | $Revision: 2932 $ |
||
18 | |||
1733 | hidnplayr | 19 | ;----------------------------------------------------------------- |
20 | ; |
||
21 | ; TCP_input: |
||
22 | ; |
||
23 | ; IN: [esp] = ptr to buffer |
||
24 | ; [esp+4] = buffer size |
||
25 | ; ebx = ptr to device struct |
||
26 | ; ecx = segment size |
||
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: / |
||
31 | ; |
||
32 | ;----------------------------------------------------------------- |
||
1830 | hidnplayr | 33 | |
1733 | hidnplayr | 34 | align 4 |
35 | TCP_input: |
||
36 | |||
2891 | hidnplayr | 37 | DEBUGF 1,"TCP_input: size=%u\n", ecx |
1733 | hidnplayr | 38 | |
2930 | hidnplayr | 39 | ; First, record the current time |
40 | mov eax, [timer_ticks] |
||
41 | mov [esp+4], eax |
||
1733 | hidnplayr | 42 | |
2930 | hidnplayr | 43 | ; then, re-calculate the checksum (if not already done by hw) |
44 | ; test [ebx + NET_DEVICE.hwacc], HWACC_TCP_IPv4_IN |
||
45 | ; jnz .checksum_ok |
||
46 | |||
2390 | hidnplayr | 47 | push ecx esi |
48 | pushw [esi + TCP_header.Checksum] |
||
49 | mov [esi + TCP_header.Checksum], 0 |
||
50 | TCP_checksum (edi), (edi+4) |
||
51 | pop cx ; previous checksum |
||
52 | cmp cx, dx |
||
53 | pop edx ecx |
||
2600 | hidnplayr | 54 | jne .drop_no_socket |
2930 | hidnplayr | 55 | .checksum_ok: |
1733 | hidnplayr | 56 | |
2930 | hidnplayr | 57 | ; Verify the data offset |
2390 | hidnplayr | 58 | and [edx + TCP_header.DataOffset], 0xf0 ; Calculate TCP segment header size (throwing away unused reserved bits in TCP header) |
59 | shr [edx + TCP_header.DataOffset], 2 |
||
60 | cmp [edx + TCP_header.DataOffset], sizeof.TCP_header ; Now see if it's at least the size of a standard TCP header |
||
2600 | hidnplayr | 61 | jb .drop_no_socket ; If not, drop the packet |
1733 | hidnplayr | 62 | |
2390 | hidnplayr | 63 | movzx eax, [edx + TCP_header.DataOffset] |
64 | sub ecx, eax ; substract TCP header size from total segment size |
||
2600 | hidnplayr | 65 | jb .drop_no_socket ; If total segment size is less then the advertised header size, drop packet |
2891 | hidnplayr | 66 | DEBUGF 1,"TCP_input: %u bytes of data\n", ecx |
1733 | hidnplayr | 67 | |
68 | ;------------------------------------------- |
||
69 | ; Convert Big-endian values to little endian |
||
70 | |||
2390 | hidnplayr | 71 | ntohd [edx + TCP_header.SequenceNumber] |
72 | ntohd [edx + TCP_header.AckNumber] |
||
1733 | hidnplayr | 73 | |
2390 | hidnplayr | 74 | ntohw [edx + TCP_header.Window] |
75 | ntohw [edx + TCP_header.UrgentPointer] |
||
76 | ntohw [edx + TCP_header.SourcePort] |
||
77 | ntohw [edx + TCP_header.DestinationPort] |
||
1733 | hidnplayr | 78 | |
2930 | hidnplayr | 79 | ;------------------------ |
80 | ; Find the socket pointer |
||
1733 | hidnplayr | 81 | |
82 | ; IP Packet TCP Destination Port = local Port |
||
83 | ; (IP Packet SenderAddress = Remote IP) OR (Remote IP = 0) |
||
2309 | hidnplayr | 84 | ; (IP Packet TCP Source Port = remote Port) OR (remote Port = 0) |
1733 | hidnplayr | 85 | |
2390 | hidnplayr | 86 | mov ebx, net_sockets |
87 | mov si, [edx + TCP_header.DestinationPort] |
||
1733 | hidnplayr | 88 | |
89 | .socket_loop: |
||
2390 | hidnplayr | 90 | mov ebx, [ebx + SOCKET.NextPtr] |
91 | or ebx, ebx |
||
2600 | hidnplayr | 92 | jz .drop_with_reset_no_socket |
1733 | hidnplayr | 93 | |
2390 | hidnplayr | 94 | cmp [ebx + SOCKET.Domain], AF_INET4 |
95 | jne .socket_loop |
||
1733 | hidnplayr | 96 | |
2390 | hidnplayr | 97 | cmp [ebx + SOCKET.Protocol], IP_PROTO_TCP |
98 | jne .socket_loop |
||
1733 | hidnplayr | 99 | |
2390 | hidnplayr | 100 | cmp [ebx + TCP_SOCKET.LocalPort], si |
101 | jne .socket_loop |
||
1733 | hidnplayr | 102 | |
2390 | hidnplayr | 103 | mov eax, [ebx + IP_SOCKET.RemoteIP] |
104 | cmp eax, [edi] ; Ipv4 source addres |
||
105 | je @f |
||
106 | test eax, eax |
||
107 | jnz .socket_loop |
||
1733 | hidnplayr | 108 | @@: |
109 | |||
2390 | hidnplayr | 110 | mov ax, [ebx + TCP_SOCKET.RemotePort] |
111 | cmp [edx + TCP_header.SourcePort], ax |
||
112 | je .found_socket |
||
113 | test ax, ax |
||
114 | jnz .socket_loop |
||
115 | .found_socket: ; ebx now contains the socketpointer |
||
2891 | hidnplayr | 116 | 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 | 117 | |
2930 | hidnplayr | 118 | ;------------- |
2890 | hidnplayr | 119 | ; update stats |
2930 | hidnplayr | 120 | |
2890 | hidnplayr | 121 | inc [TCP_segments_rx] ; FIXME: correct interface? |
1733 | hidnplayr | 122 | |
123 | ;---------------------------- |
||
124 | ; Check if socket isnt closed |
||
125 | |||
2390 | hidnplayr | 126 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
127 | je .drop_not_locked |
||
1733 | hidnplayr | 128 | |
129 | ;---------------- |
||
130 | ; Lock the socket |
||
131 | |||
2402 | hidnplayr | 132 | pusha |
133 | lea ecx, [ebx + SOCKET.mutex] |
||
134 | call mutex_lock |
||
135 | popa |
||
1830 | hidnplayr | 136 | |
2891 | hidnplayr | 137 | DEBUGF 1,"TCP_input: socket locked\n" |
1733 | hidnplayr | 138 | |
2891 | hidnplayr | 139 | ;---------------------- |
140 | ; set need_output to 0 |
||
141 | |||
142 | mov [ebx + TCP_SOCKET.sendalot], 0 |
||
143 | |||
1733 | hidnplayr | 144 | ;--------------------------------------- |
145 | ; unscale the window into a 32 bit value |
||
146 | |||
2390 | hidnplayr | 147 | movzx eax, [edx + TCP_header.Window] |
148 | push ecx |
||
149 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
||
150 | shl eax, cl |
||
151 | mov dword [edx + TCP_header.Window], eax ; word after window is checksum, we dont need checksum anymore |
||
152 | pop ecx |
||
1733 | hidnplayr | 153 | |
2930 | hidnplayr | 154 | ;--------------------------------------- |
155 | ; Are we accepting incoming connections? |
||
1733 | hidnplayr | 156 | |
2390 | hidnplayr | 157 | test [ebx + SOCKET.options], SO_ACCEPTCON |
2930 | hidnplayr | 158 | jnz .accept_connection |
1733 | hidnplayr | 159 | |
160 | ;------------------------------------- |
||
161 | ; Reset idle timer and keepalive timer |
||
162 | |||
2390 | hidnplayr | 163 | mov [ebx + TCP_SOCKET.t_idle], 0 |
164 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval |
||
1733 | hidnplayr | 165 | |
166 | ;-------------------- |
||
167 | ; Process TCP options |
||
168 | |||
2390 | hidnplayr | 169 | movzx eax, [edx + TCP_header.DataOffset] |
170 | cmp eax, sizeof.TCP_header ; Does header contain any options? |
||
171 | je .no_options |
||
1733 | hidnplayr | 172 | |
2891 | hidnplayr | 173 | DEBUGF 1,"TCP_input: Segment has options\n" |
1733 | hidnplayr | 174 | |
2390 | hidnplayr | 175 | cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN ; no options when in listen state |
176 | jz .not_uni_xfer ; also no header prediction |
||
1733 | hidnplayr | 177 | |
2390 | hidnplayr | 178 | add eax, edx |
179 | lea esi, [edx + sizeof.TCP_header] |
||
1733 | hidnplayr | 180 | |
181 | .opt_loop: |
||
2390 | hidnplayr | 182 | cmp esi, eax ; are we scanning outside of header? |
183 | jae .no_options |
||
1733 | hidnplayr | 184 | |
2390 | hidnplayr | 185 | cmp byte [esi], TCP_OPT_EOL ; end of option list? |
186 | jz .no_options |
||
1733 | hidnplayr | 187 | |
2390 | hidnplayr | 188 | cmp byte [esi], TCP_OPT_NOP ; nop ? |
189 | jz .opt_nop |
||
1733 | hidnplayr | 190 | |
2390 | hidnplayr | 191 | cmp byte [esi], TCP_OPT_MAXSEG |
192 | je .opt_maxseg |
||
1733 | hidnplayr | 193 | |
2390 | hidnplayr | 194 | cmp byte [esi], TCP_OPT_WINDOW |
195 | je .opt_window |
||
1733 | hidnplayr | 196 | |
2390 | hidnplayr | 197 | cmp byte [esi], TCP_OPT_TIMESTAMP |
198 | je .opt_timestamp |
||
1733 | hidnplayr | 199 | |
2390 | hidnplayr | 200 | jmp .no_options ; If we reach here, some unknown options were received, skip them all! |
1733 | hidnplayr | 201 | |
202 | .opt_nop: |
||
2930 | hidnplayr | 203 | inc esi |
2390 | hidnplayr | 204 | jmp .opt_loop |
1733 | hidnplayr | 205 | |
206 | .opt_maxseg: |
||
2390 | hidnplayr | 207 | cmp byte [esi+1], 4 |
208 | jne .no_options ; error occured, ignore all options! |
||
1733 | hidnplayr | 209 | |
2390 | hidnplayr | 210 | test [edx + TCP_header.Flags], TH_SYN |
211 | jz @f |
||
1733 | hidnplayr | 212 | |
2390 | hidnplayr | 213 | movzx eax, word[esi+2] |
214 | rol ax, 8 |
||
2891 | hidnplayr | 215 | DEBUGF 1,"TCP_input: Maxseg=%u\n", ax |
1733 | hidnplayr | 216 | |
2390 | hidnplayr | 217 | mov [ebx + TCP_SOCKET.t_maxseg], eax |
1733 | hidnplayr | 218 | |
219 | @@: |
||
2930 | hidnplayr | 220 | add esi, 4 |
2390 | hidnplayr | 221 | jmp .opt_loop |
1733 | hidnplayr | 222 | |
223 | |||
224 | .opt_window: |
||
2390 | hidnplayr | 225 | cmp byte [esi+1], 3 |
226 | jne .no_options |
||
1733 | hidnplayr | 227 | |
2390 | hidnplayr | 228 | test [edx + TCP_header.Flags], TH_SYN |
229 | jz @f |
||
1733 | hidnplayr | 230 | |
2891 | hidnplayr | 231 | DEBUGF 1,"TCP_input: Got window option\n" |
1733 | hidnplayr | 232 | |
2390 | hidnplayr | 233 | ;;;;; |
1733 | hidnplayr | 234 | @@: |
2930 | hidnplayr | 235 | add esi, 3 |
2390 | hidnplayr | 236 | jmp .opt_loop |
1733 | hidnplayr | 237 | |
238 | |||
239 | .opt_timestamp: |
||
2930 | hidnplayr | 240 | cmp byte [esi+1], 10 ; length must be 10 |
2390 | hidnplayr | 241 | jne .no_options |
1733 | hidnplayr | 242 | |
2891 | hidnplayr | 243 | DEBUGF 1,"TCP_input: Got timestamp option\n" |
1733 | hidnplayr | 244 | |
2930 | hidnplayr | 245 | push dword [esi + 2] ; timestamp |
246 | pop [ebx + TCP_SOCKET.ts_recent] |
||
1733 | hidnplayr | 247 | |
2930 | hidnplayr | 248 | push dword [esi + 6] ; timestamp echo reply |
249 | pop [ebx + TCP_SOCKET.ts_ecr] |
||
250 | |||
2390 | hidnplayr | 251 | add esi, 10 |
252 | jmp .opt_loop |
||
1733 | hidnplayr | 253 | |
254 | .no_options: |
||
255 | |||
256 | ;----------------------------------------------------------------------- |
||
257 | ; Time to do some header prediction (Original Principle by Van Jacobson) |
||
258 | |||
259 | ; There are two common cases for an uni-directional data transfer. |
||
260 | ; |
||
261 | ; General rule: the packets has no control flags, is in-sequence, |
||
262 | ; window width didnt change and we're not retransmitting. |
||
263 | ; |
||
264 | ; Second rules: |
||
265 | ; - If the length is 0 and the ACK moved forward, we're the sender side of the transfer. |
||
266 | ; In this case we'll free the ACK'ed data and notify higher levels that we have free space in buffer |
||
267 | ; |
||
268 | ; - If the length is not 0 and the ACK didn't move, we're the receiver side of the transfer. |
||
269 | ; If the packets are in order (data queue is empty), add the data to the socket buffer and request a delayed ACK |
||
270 | |||
2390 | hidnplayr | 271 | cmp [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
272 | jnz .not_uni_xfer |
||
1733 | hidnplayr | 273 | |
2390 | hidnplayr | 274 | test [edx + TCP_header.Flags], TH_SYN + TH_FIN + TH_RST + TH_URG |
275 | jnz .not_uni_xfer |
||
1733 | hidnplayr | 276 | |
2390 | hidnplayr | 277 | test [edx + TCP_header.Flags], TH_ACK |
278 | jz .not_uni_xfer |
||
1733 | hidnplayr | 279 | |
2390 | hidnplayr | 280 | mov eax, [edx + TCP_header.SequenceNumber] |
281 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
282 | jne .not_uni_xfer |
||
1733 | hidnplayr | 283 | |
2390 | hidnplayr | 284 | mov eax, dword [edx + TCP_header.Window] |
285 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
286 | jne .not_uni_xfer |
||
1733 | hidnplayr | 287 | |
2390 | hidnplayr | 288 | mov eax, [ebx + TCP_SOCKET.SND_NXT] |
289 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
290 | jne .not_uni_xfer |
||
1733 | hidnplayr | 291 | |
292 | ;--------------------------------------- |
||
293 | ; check if we are sender in the uni-xfer |
||
294 | |||
295 | ; If the following 4 conditions are all true, this segment is a pure ACK. |
||
296 | ; |
||
297 | ; - The segment contains no data. |
||
2390 | hidnplayr | 298 | test ecx, ecx |
299 | jnz .not_sender |
||
1733 | hidnplayr | 300 | |
301 | ; - The congestion window is greater than or equal to the current send window. |
||
302 | ; 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. |
||
2390 | hidnplayr | 303 | mov eax, [ebx + TCP_SOCKET.SND_CWND] |
304 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
305 | jb .not_uni_xfer |
||
1733 | hidnplayr | 306 | |
307 | ; - The acknowledgment field in the segment is less than or equal to the maximum sequence number sent. |
||
2390 | hidnplayr | 308 | mov eax, [edx + TCP_header.AckNumber] |
309 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
310 | ja .not_uni_xfer |
||
1733 | hidnplayr | 311 | |
312 | ; - The acknowledgment field in the segment is greater than the largest unacknowledged sequence number. |
||
2390 | hidnplayr | 313 | sub eax, [ebx + TCP_SOCKET.SND_UNA] |
314 | jbe .not_uni_xfer |
||
1733 | hidnplayr | 315 | |
2891 | hidnplayr | 316 | DEBUGF 1,"TCP_input: Header prediction: we are sender\n" |
1733 | hidnplayr | 317 | |
318 | ;--------------------------------- |
||
319 | ; Packet is a pure ACK, process it |
||
320 | |||
321 | ; Delete acknowledged bytes from send buffer |
||
2390 | hidnplayr | 322 | pusha |
323 | mov ecx, eax |
||
324 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
325 | call SOCKET_ring_free |
||
326 | popa |
||
1733 | hidnplayr | 327 | |
2930 | hidnplayr | 328 | ; Update RTT estimators |
329 | |||
330 | ; if ts_present |
||
331 | ; mov eax, [esp + 4] ; timestamp when this segment was received |
||
332 | ; sub eax, [ebx + TCP_SOCKET.ts_ecr] |
||
333 | ; inc eax |
||
334 | ; call TCP_xmit_timer |
||
335 | |||
336 | ; else if (t_rtt && SEG_GT(ti_ack - t_rtsec)) |
||
337 | ; mov eax, [ebx + t_rtt] |
||
338 | ; call TCP_xmit_timer |
||
339 | ; end if |
||
340 | |||
1733 | hidnplayr | 341 | ; update window pointers |
2390 | hidnplayr | 342 | mov eax, [edx + TCP_header.AckNumber] |
343 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
1733 | hidnplayr | 344 | |
345 | ; Stop retransmit timer |
||
2390 | hidnplayr | 346 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 |
1733 | hidnplayr | 347 | |
348 | ; Awaken waiting processes |
||
2402 | hidnplayr | 349 | pusha |
350 | lea ecx, [ebx + SOCKET.mutex] |
||
351 | call mutex_unlock |
||
352 | popa |
||
353 | |||
2390 | hidnplayr | 354 | mov eax, ebx |
355 | call SOCKET_notify_owner |
||
1733 | hidnplayr | 356 | |
1763 | hidnplayr | 357 | ; Generate more output |
2390 | hidnplayr | 358 | call TCP_output |
1733 | hidnplayr | 359 | |
2390 | hidnplayr | 360 | jmp .drop_not_locked |
1763 | hidnplayr | 361 | |
1733 | hidnplayr | 362 | ;------------------------------------------------- |
363 | ; maybe we are the receiver in the uni-xfer then.. |
||
364 | |||
365 | .not_sender: |
||
366 | ; - The amount of data in the segment is greater than 0 (data count is in ecx) |
||
367 | |||
368 | ; - The acknowledgment field equals the largest unacknowledged sequence number. This means no data is acknowledged by this segment. |
||
2390 | hidnplayr | 369 | mov eax, [edx + TCP_header.AckNumber] |
370 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
371 | jne .not_uni_xfer |
||
1733 | hidnplayr | 372 | |
373 | ; - The reassembly list of out-of-order segments for the connection is empty (seg_next equals tp). |
||
374 | |||
375 | ;;; TODO |
||
376 | |||
2930 | hidnplayr | 377 | ; jnz .not_uni_xfer |
1733 | hidnplayr | 378 | |
379 | ; Complete processing of received data |
||
380 | |||
2891 | hidnplayr | 381 | DEBUGF 1,"TCP_input: Header prediction: we are receiving %u bytes\n", ecx |
1733 | hidnplayr | 382 | |
2390 | hidnplayr | 383 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
1763 | hidnplayr | 384 | |
2390 | hidnplayr | 385 | movzx esi, [edx + TCP_header.DataOffset] |
386 | add esi, edx |
||
387 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
388 | call SOCKET_ring_write ; Add the data to the socket buffer |
||
1733 | hidnplayr | 389 | |
2390 | hidnplayr | 390 | mov eax, ebx |
391 | call SOCKET_notify_owner |
||
1733 | hidnplayr | 392 | |
2390 | hidnplayr | 393 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK ; Set delayed ack flag |
1733 | hidnplayr | 394 | |
2390 | hidnplayr | 395 | jmp .drop |
1733 | hidnplayr | 396 | |
397 | |||
398 | |||
399 | |||
400 | |||
401 | |||
402 | ;-------------------------------------------------- |
||
403 | ; Header prediction failed, do it the slow way |
||
404 | |||
405 | .not_uni_xfer: |
||
406 | |||
2891 | hidnplayr | 407 | DEBUGF 1,"TCP_input: Header prediction failed\n" |
1733 | hidnplayr | 408 | |
409 | ; Calculate receive window size |
||
410 | |||
2362 | hidnplayr | 411 | ; mov eax, [ebx + STREAM_SOCKET.rcv.size] |
2305 | hidnplayr | 412 | ; neg eax |
413 | ; add eax, SOCKETBUFFSIZE |
||
414 | ; mov edx, [ebx + TCP_SOCKET.RCV_ADV] |
||
415 | ; sub edx, [ebx + TCP_SOCKET.RCV_NXT] |
||
416 | ; cmp eax, edx |
||
417 | ; jae @f |
||
418 | ; mov eax, edx |
||
419 | ; @@: |
||
1733 | hidnplayr | 420 | |
2390 | hidnplayr | 421 | cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN |
422 | je .LISTEN |
||
1733 | hidnplayr | 423 | |
2390 | hidnplayr | 424 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_SENT |
425 | je .SYN_SENT |
||
1733 | hidnplayr | 426 | |
2891 | hidnplayr | 427 | DEBUGF 1,"TCP_input: state is not listen or syn_sent\n" |
1733 | hidnplayr | 428 | |
429 | ;-------------------------------------------- |
||
430 | ; Protection Against Wrapped Sequence Numbers |
||
431 | |||
432 | ; First, check if timestamp is present |
||
433 | |||
1763 | hidnplayr | 434 | ;;;; TODO 602 |
1733 | hidnplayr | 435 | |
436 | ; Then, check if at least some bytes of data are within window |
||
437 | |||
438 | ;;;; TODO |
||
439 | |||
440 | |||
441 | |||
442 | |||
443 | |||
444 | |||
445 | |||
446 | |||
447 | ;---------------------------- |
||
448 | ; trim any data not in window |
||
449 | |||
450 | ; check for duplicate data at beginning of segment |
||
451 | |||
2390 | hidnplayr | 452 | mov eax, [ebx + TCP_SOCKET.RCV_NXT] |
453 | sub eax, [edx + TCP_header.SequenceNumber] |
||
454 | jbe .no_duplicate |
||
1733 | hidnplayr | 455 | |
2891 | hidnplayr | 456 | DEBUGF 1,"TCP_input: %u bytes duplicate data!\n", eax |
1763 | hidnplayr | 457 | |
2390 | hidnplayr | 458 | test [edx + TCP_header.Flags], TH_SYN |
459 | jz .no_dup_syn |
||
1733 | hidnplayr | 460 | |
461 | ; remove duplicate syn |
||
462 | |||
2390 | hidnplayr | 463 | and [edx + TCP_header.Flags], not (TH_SYN) |
464 | inc [edx + TCP_header.SequenceNumber] |
||
1733 | hidnplayr | 465 | |
2390 | hidnplayr | 466 | cmp [edx + TCP_header.UrgentPointer], 1 |
467 | jbe @f |
||
468 | dec [edx + TCP_header.UrgentPointer] |
||
469 | jmp .dup_syn |
||
1733 | hidnplayr | 470 | @@: |
2390 | hidnplayr | 471 | and [edx + TCP_header.Flags], not (TH_URG) |
1838 | hidnplayr | 472 | .dup_syn: |
2390 | hidnplayr | 473 | dec eax |
1763 | hidnplayr | 474 | .no_dup_syn: |
1733 | hidnplayr | 475 | |
476 | ; eax holds number of bytes to drop |
||
477 | |||
478 | ; Check for entire duplicate packet |
||
479 | |||
2390 | hidnplayr | 480 | cmp eax, ecx |
481 | jae .duplicate |
||
1733 | hidnplayr | 482 | |
2891 | hidnplayr | 483 | DEBUGF 1,"TCP_input: Going to drop %u out of %u bytes\n", eax, ecx |
1830 | hidnplayr | 484 | |
1733 | hidnplayr | 485 | ;;; TODO: apply figure 28.30 |
486 | |||
487 | ; Check for duplicate FIN |
||
488 | |||
2390 | hidnplayr | 489 | test [edx + TCP_header.Flags], TH_FIN |
2891 | hidnplayr | 490 | jz .no_fin2 |
2390 | hidnplayr | 491 | inc ecx |
492 | cmp eax, ecx |
||
493 | jne @f |
||
1733 | hidnplayr | 494 | |
2390 | hidnplayr | 495 | mov eax, ecx |
496 | and [edx + TCP_header.Flags], not TH_FIN |
||
497 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
2891 | hidnplayr | 498 | dec ecx |
2390 | hidnplayr | 499 | jmp .no_duplicate |
2891 | hidnplayr | 500 | @@: |
501 | dec ecx |
||
502 | .no_fin2: |
||
1733 | hidnplayr | 503 | |
504 | ; Handle the case when a bound socket connects to itself |
||
2891 | hidnplayr | 505 | ; Allow packets with a SYN and an ACK to continue with the processing |
1733 | hidnplayr | 506 | |
507 | ;------------------------------------- |
||
508 | ; Generate duplicate ACK if nescessary |
||
509 | |||
510 | ; This code also handles simultaneous half-open or self-connects |
||
511 | |||
2390 | hidnplayr | 512 | test eax, eax |
513 | jnz .drop_after_ack |
||
1733 | hidnplayr | 514 | |
2390 | hidnplayr | 515 | cmp [edx + TCP_header.Flags], TH_ACK |
516 | jz .drop_after_ack |
||
1733 | hidnplayr | 517 | .duplicate: |
518 | |||
2891 | hidnplayr | 519 | DEBUGF 1,"TCP_input: Duplicate received\n" |
1733 | hidnplayr | 520 | |
521 | ;---------------------------------------- |
||
522 | ; Update statistics for duplicate packets |
||
523 | |||
524 | ;;; TODO |
||
525 | |||
2390 | hidnplayr | 526 | jmp .drop_after_ack |
1733 | hidnplayr | 527 | .no_duplicate: |
528 | |||
529 | ;----------------------------------------------- |
||
530 | ; Remove duplicate data and update urgent offset |
||
531 | |||
2390 | hidnplayr | 532 | add [edx + TCP_header.SequenceNumber], eax |
2891 | hidnplayr | 533 | sub ecx, eax ;;;;;;;; Checkme |
1733 | hidnplayr | 534 | |
2390 | hidnplayr | 535 | sub [edx + TCP_header.UrgentPointer], ax |
536 | ja @f |
||
1733 | hidnplayr | 537 | |
2390 | hidnplayr | 538 | and [edx + TCP_header.Flags], not (TH_URG) |
539 | mov [edx + TCP_header.UrgentPointer], 0 |
||
1733 | hidnplayr | 540 | @@: |
541 | |||
542 | ;-------------------------------------------------- |
||
543 | ; Handle data that arrives after process terminates |
||
544 | |||
2390 | hidnplayr | 545 | cmp [ebx + SOCKET.PID], 0 |
546 | ja @f |
||
1733 | hidnplayr | 547 | |
2390 | hidnplayr | 548 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
549 | jbe @f |
||
1733 | hidnplayr | 550 | |
2390 | hidnplayr | 551 | test ecx, ecx |
552 | jz @f |
||
1733 | hidnplayr | 553 | |
554 | ;;; Close the socket |
||
555 | ;;; update stats |
||
556 | |||
2390 | hidnplayr | 557 | jmp .drop_with_reset |
1733 | hidnplayr | 558 | @@: |
559 | |||
560 | ;---------------------------------------- |
||
561 | ; Remove data beyond right edge of window |
||
562 | |||
2390 | hidnplayr | 563 | mov eax, [edx + TCP_header.SequenceNumber] |
564 | add eax, ecx |
||
565 | sub eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
566 | sub ax, [ebx + TCP_SOCKET.RCV_WND] |
||
1733 | hidnplayr | 567 | |
568 | ; eax now holds the number of bytes to drop |
||
569 | |||
2390 | hidnplayr | 570 | jbe .no_excess_data |
1733 | hidnplayr | 571 | |
572 | ;;; TODO: update stats |
||
573 | |||
2390 | hidnplayr | 574 | cmp eax, ecx |
575 | jb .dont_drop_all |
||
1733 | hidnplayr | 576 | |
577 | ;;; TODO 700-736 |
||
578 | |||
579 | .dont_drop_all: |
||
580 | |||
581 | .no_excess_data: |
||
582 | |||
583 | ;----------------- |
||
584 | ; Record timestamp |
||
585 | |||
586 | ;;; TODO 737-746 |
||
587 | |||
588 | |||
589 | ;------------------ |
||
590 | ; Process RST flags |
||
591 | |||
2390 | hidnplayr | 592 | test [edx + TCP_header.Flags], TH_RST |
2891 | hidnplayr | 593 | jz .no_rst |
1733 | hidnplayr | 594 | |
2891 | hidnplayr | 595 | DEBUGF 1,"TCP_input: Got an RST flag\n" |
1733 | hidnplayr | 596 | |
2390 | hidnplayr | 597 | mov eax, [ebx + TCP_SOCKET.t_state] |
598 | shl eax, 2 |
||
599 | jmp dword [eax + .rst_sw_list] |
||
1733 | hidnplayr | 600 | |
601 | .rst_sw_list: |
||
2891 | hidnplayr | 602 | dd .no_rst ; TCPS_CLOSED |
603 | dd .no_rst ; TCPS_LISTEN |
||
604 | dd .no_rst ; TCPS_SYN_SENT |
||
605 | dd .econnrefused ; TCPS_SYN_RECEIVED |
||
606 | dd .econnreset ; TCPS_ESTABLISHED |
||
607 | dd .econnreset ; TCPS_CLOSE_WAIT |
||
608 | dd .econnreset ; TCPS_FIN_WAIT_1 |
||
609 | dd .rst_close ; TCPS_CLOSING |
||
610 | dd .rst_close ; TCPS_LAST_ACK |
||
611 | dd .econnreset ; TCPS_FIN_WAIT_2 |
||
612 | dd .rst_close ; TCPS_TIMED_WAIT |
||
1733 | hidnplayr | 613 | |
614 | .econnrefused: |
||
2891 | hidnplayr | 615 | DEBUGF 1,"TCP_input: Connection refused\n" |
1733 | hidnplayr | 616 | |
2390 | hidnplayr | 617 | mov [ebx + SOCKET.errorcode], ECONNREFUSED |
618 | jmp .close |
||
1733 | hidnplayr | 619 | |
620 | .econnreset: |
||
2891 | hidnplayr | 621 | DEBUGF 1,"TCP_input: Connection reset\n" |
1733 | hidnplayr | 622 | |
2390 | hidnplayr | 623 | mov [ebx + SOCKET.errorcode], ECONNRESET |
1733 | hidnplayr | 624 | |
2882 | hidnplayr | 625 | .close: |
2891 | hidnplayr | 626 | DEBUGF 1,"TCP_input: Closing connection\n" |
1733 | hidnplayr | 627 | |
2390 | hidnplayr | 628 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
2882 | hidnplayr | 629 | ;;; TODO: update stats (tcp drops) |
2390 | hidnplayr | 630 | mov eax, ebx |
631 | call TCP_close |
||
632 | jmp .drop |
||
1733 | hidnplayr | 633 | |
634 | .rst_close: |
||
2891 | hidnplayr | 635 | DEBUGF 1,"TCP_input: Closing with reset\n" |
1733 | hidnplayr | 636 | |
2390 | hidnplayr | 637 | mov eax, ebx |
638 | call TCP_close |
||
639 | jmp .drop |
||
1733 | hidnplayr | 640 | |
2891 | hidnplayr | 641 | .no_rst: |
1733 | hidnplayr | 642 | |
643 | ;-------------------------------------- |
||
644 | ; handle SYN-full and ACK-less segments |
||
645 | |||
2390 | hidnplayr | 646 | test [edx + TCP_header.Flags], TH_SYN |
647 | jz @f |
||
1733 | hidnplayr | 648 | |
2390 | hidnplayr | 649 | mov eax, ebx |
650 | mov ebx, ECONNRESET |
||
651 | call TCP_drop |
||
652 | jmp .drop_with_reset |
||
1733 | hidnplayr | 653 | @@: |
654 | |||
655 | ;--------------- |
||
656 | ; ACK processing |
||
657 | |||
2891 | hidnplayr | 658 | test [edx + TCP_header.Flags], TH_ACK |
659 | jz .drop |
||
660 | |||
2390 | hidnplayr | 661 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
662 | jnz .no_syn_rcv |
||
1733 | hidnplayr | 663 | |
2891 | hidnplayr | 664 | DEBUGF 1,"TCP_input: state=syn_received\n" |
1733 | hidnplayr | 665 | |
2390 | hidnplayr | 666 | mov eax, [edx + TCP_header.AckNumber] |
667 | cmp [ebx + TCP_SOCKET.SND_UNA], eax |
||
668 | ja .drop_with_reset |
||
669 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
670 | ja .drop_with_reset |
||
1733 | hidnplayr | 671 | |
2309 | hidnplayr | 672 | ;;; TODO: update stats |
673 | |||
2390 | hidnplayr | 674 | mov eax, ebx |
675 | call SOCKET_is_connected |
||
676 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
||
1831 | hidnplayr | 677 | |
678 | ; Do window scaling? |
||
679 | |||
2390 | hidnplayr | 680 | test [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
681 | jz @f |
||
682 | test [ebx + TCP_SOCKET.t_flags], TF_REQ_SCALE |
||
683 | jz @f |
||
1831 | hidnplayr | 684 | |
2390 | hidnplayr | 685 | push word [ebx + TCP_SOCKET.requested_s_scale] ; Set send and receive scale factors to the received values |
686 | pop word [ebx + TCP_SOCKET.SND_SCALE] |
||
1831 | hidnplayr | 687 | @@: |
688 | |||
2891 | hidnplayr | 689 | ;;; TODO: call TCP_reassemble |
1831 | hidnplayr | 690 | |
2390 | hidnplayr | 691 | mov eax, [edx + TCP_header.SequenceNumber] |
692 | dec eax |
||
693 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
1831 | hidnplayr | 694 | |
1733 | hidnplayr | 695 | .no_syn_rcv: |
696 | |||
697 | ; check for duplicate ACK |
||
698 | |||
2390 | hidnplayr | 699 | mov eax, [edx + TCP_header.AckNumber] |
700 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
701 | ja .not_dup_ack |
||
1733 | hidnplayr | 702 | |
2390 | hidnplayr | 703 | test ecx, ecx |
704 | jnz .reset_dupacks |
||
1733 | hidnplayr | 705 | |
2390 | hidnplayr | 706 | mov eax, dword [edx + TCP_header.Window] |
707 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
708 | jne .reset_dupacks |
||
1733 | hidnplayr | 709 | |
2891 | hidnplayr | 710 | DEBUGF 1,"TCP_input: Processing duplicate ACK\n" |
1733 | hidnplayr | 711 | |
2390 | hidnplayr | 712 | cmp [ebx + TCP_SOCKET.timer_retransmission], 10000 ;;;; FIXME |
713 | ja @f |
||
1733 | hidnplayr | 714 | |
2390 | hidnplayr | 715 | mov eax, [edx + TCP_header.AckNumber] |
716 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
717 | je .dup_ack |
||
1763 | hidnplayr | 718 | |
719 | @@: |
||
2390 | hidnplayr | 720 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
721 | jmp .not_dup_ack |
||
1763 | hidnplayr | 722 | |
723 | .dup_ack: |
||
2390 | hidnplayr | 724 | inc [ebx + TCP_SOCKET.t_dupacks] |
725 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
||
726 | jne .no_re_xmit |
||
1763 | hidnplayr | 727 | |
2390 | hidnplayr | 728 | push [ebx + TCP_SOCKET.SND_NXT] ; >>>> |
1763 | hidnplayr | 729 | |
2390 | hidnplayr | 730 | mov eax, [ebx + TCP_SOCKET.SND_WND] |
731 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
||
2866 | hidnplayr | 732 | cmova eax, [ebx + TCP_SOCKET.SND_CWND] |
2390 | hidnplayr | 733 | shr eax, 1 |
734 | push edx |
||
735 | xor edx, edx |
||
736 | div [ebx + TCP_SOCKET.t_maxseg] |
||
737 | cmp eax, 2 |
||
738 | jae @f |
||
739 | mov ax, 2 |
||
1763 | hidnplayr | 740 | @@: |
2390 | hidnplayr | 741 | mul [ebx + TCP_SOCKET.t_maxseg] |
742 | pop edx |
||
743 | mov [ebx + TCP_SOCKET.SND_SSTHRESH], eax |
||
1763 | hidnplayr | 744 | |
2390 | hidnplayr | 745 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 ; turn off retransmission timer |
746 | mov [ebx + TCP_SOCKET.t_rtt], 0 |
||
747 | mov eax, [edx + TCP_header.AckNumber] |
||
748 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
749 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
750 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
1763 | hidnplayr | 751 | |
2390 | hidnplayr | 752 | mov eax, ebx |
753 | call TCP_output ; retransmit missing segment |
||
1763 | hidnplayr | 754 | |
2390 | hidnplayr | 755 | push edx |
756 | xor edx, edx |
||
757 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
758 | mul [ebx + TCP_SOCKET.t_dupacks] |
||
759 | pop edx |
||
760 | add eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
||
761 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
1763 | hidnplayr | 762 | |
2390 | hidnplayr | 763 | pop eax ; <<<< |
764 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
765 | jb @f |
||
766 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1763 | hidnplayr | 767 | @@: |
768 | |||
2390 | hidnplayr | 769 | jmp .drop |
1733 | hidnplayr | 770 | |
771 | |||
1763 | hidnplayr | 772 | .no_re_xmit: |
2390 | hidnplayr | 773 | jbe .not_dup_ack |
1733 | hidnplayr | 774 | |
2891 | hidnplayr | 775 | DEBUGF 1,"TCP_input: Increasing congestion window\n" |
1733 | hidnplayr | 776 | |
2390 | hidnplayr | 777 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
778 | add [ebx + TCP_SOCKET.SND_CWND], eax |
||
1733 | hidnplayr | 779 | |
2390 | hidnplayr | 780 | mov eax, ebx |
781 | call TCP_output |
||
1733 | hidnplayr | 782 | |
2390 | hidnplayr | 783 | jmp .drop |
1733 | hidnplayr | 784 | |
785 | |||
1763 | hidnplayr | 786 | .not_dup_ack: |
787 | |||
1733 | hidnplayr | 788 | ;------------------------------------------------- |
789 | ; If the congestion window was inflated to account |
||
790 | ; for the other side's cached packets, retract it |
||
791 | |||
2390 | hidnplayr | 792 | mov eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
793 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
||
794 | ja @f |
||
795 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
||
796 | jbe @f |
||
797 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
1763 | hidnplayr | 798 | @@: |
1733 | hidnplayr | 799 | |
2390 | hidnplayr | 800 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
1733 | hidnplayr | 801 | |
2390 | hidnplayr | 802 | mov eax, [edx + TCP_header.AckNumber] |
803 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
804 | jbe @f |
||
1733 | hidnplayr | 805 | |
2390 | hidnplayr | 806 | ;;; TODO: update stats |
807 | jmp .drop_after_ack |
||
1733 | hidnplayr | 808 | |
1763 | hidnplayr | 809 | @@: |
1733 | hidnplayr | 810 | |
2390 | hidnplayr | 811 | mov edi, [edx + TCP_header.AckNumber] |
812 | sub edi, [ebx + TCP_SOCKET.SND_UNA] ; now we got the number of acked bytes in edi |
||
1733 | hidnplayr | 813 | |
2390 | hidnplayr | 814 | ;;; TODO: update stats |
1733 | hidnplayr | 815 | |
816 | |||
2891 | hidnplayr | 817 | DEBUGF 1,"TCP_input: acceptable ACK for %u bytes\n", edi |
1763 | hidnplayr | 818 | |
1733 | hidnplayr | 819 | ;------------------------------------------ |
820 | ; RTT measurements and retransmission timer |
||
821 | |||
2390 | hidnplayr | 822 | ;;;;; 912 - 926 |
1733 | hidnplayr | 823 | |
2390 | hidnplayr | 824 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 |
1733 | hidnplayr | 825 | |
2390 | hidnplayr | 826 | mov eax, [ebx + TCP_SOCKET.SND_MAX] |
827 | cmp eax, [edx + TCP_header.AckNumber] |
||
828 | je .all_outstanding |
||
829 | mov [ebx + TCP_SOCKET.timer_retransmission], 120 ;;;; TODO: correct this value (use a macro for it) |
||
2891 | hidnplayr | 830 | |
1733 | hidnplayr | 831 | .all_outstanding: |
2891 | hidnplayr | 832 | inc [ebx + TCP_SOCKET.sendalot] ; need output |
1733 | hidnplayr | 833 | |
834 | ;------------------------------------------- |
||
835 | ; Open congestion window in response to ACKs |
||
836 | |||
2390 | hidnplayr | 837 | mov esi, [ebx + TCP_SOCKET.SND_CWND] |
838 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
1733 | hidnplayr | 839 | |
2390 | hidnplayr | 840 | cmp esi, [ebx + TCP_SOCKET.SND_SSTHRESH] |
841 | jbe @f |
||
842 | push edx |
||
843 | push eax |
||
844 | mul eax |
||
845 | div esi |
||
846 | pop edx |
||
847 | shr edx, 3 |
||
848 | add eax, edx |
||
849 | pop edx |
||
1763 | hidnplayr | 850 | @@: |
1733 | hidnplayr | 851 | |
2390 | hidnplayr | 852 | add esi, eax |
1733 | hidnplayr | 853 | |
2390 | hidnplayr | 854 | push ecx |
855 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
||
856 | mov eax, TCP_max_win |
||
857 | shl eax, cl |
||
858 | pop ecx |
||
1733 | hidnplayr | 859 | |
2390 | hidnplayr | 860 | cmp esi, eax |
2866 | hidnplayr | 861 | cmova esi, eax |
2390 | hidnplayr | 862 | mov [ebx + TCP_SOCKET.SND_CWND], esi |
1733 | hidnplayr | 863 | |
2891 | hidnplayr | 864 | ;------------------------------------------ |
865 | ; Remove acknowledged data from send buffer |
||
1733 | hidnplayr | 866 | |
2891 | hidnplayr | 867 | cmp edi, [ebx + STREAM_SOCKET.snd.size] |
868 | jbe .finiacked |
||
1733 | hidnplayr | 869 | |
2891 | hidnplayr | 870 | push ecx edx ebx |
871 | mov ecx, [ebx + STREAM_SOCKET.snd.size] |
||
872 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
873 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
||
874 | call SOCKET_ring_free |
||
875 | pop ebx edx ecx |
||
1733 | hidnplayr | 876 | |
2891 | hidnplayr | 877 | DEBUGF 1,"TCP_input: our FIN is acked\n" |
878 | stc |
||
1763 | hidnplayr | 879 | |
2891 | hidnplayr | 880 | jmp .wakeup |
1763 | hidnplayr | 881 | |
2891 | hidnplayr | 882 | .finiacked: |
1763 | hidnplayr | 883 | |
2390 | hidnplayr | 884 | push ecx edx ebx |
885 | mov ecx, edi |
||
886 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
887 | call SOCKET_ring_free |
||
888 | pop ebx |
||
889 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
||
890 | pop edx ecx |
||
1733 | hidnplayr | 891 | |
2891 | hidnplayr | 892 | DEBUGF 1,"TCP_input: our FIN is not acked\n" |
893 | clc |
||
894 | |||
895 | ;---------------------------------------- |
||
1733 | hidnplayr | 896 | ; Wake up process waiting on send buffer |
897 | |||
2891 | hidnplayr | 898 | .wakeup: |
899 | |||
900 | pushf |
||
2390 | hidnplayr | 901 | mov eax, ebx |
902 | call SOCKET_notify_owner |
||
1733 | hidnplayr | 903 | |
1831 | hidnplayr | 904 | ; Update TCPS |
1733 | hidnplayr | 905 | |
2390 | hidnplayr | 906 | mov eax, [edx + TCP_header.AckNumber] |
907 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
908 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
909 | jb @f |
||
910 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1733 | hidnplayr | 911 | @@: |
912 | |||
2891 | hidnplayr | 913 | popf |
1733 | hidnplayr | 914 | |
915 | ; General ACK handling complete |
||
916 | ; Now do the state-specific ones |
||
917 | |||
2390 | hidnplayr | 918 | mov eax, [ebx + TCP_SOCKET.t_state] |
919 | jmp dword [eax*4 + .ACK_sw_list] |
||
1733 | hidnplayr | 920 | |
921 | .ACK_sw_list: |
||
2891 | hidnplayr | 922 | dd .ack_processed ; TCPS_CLOSED |
923 | dd .ack_processed ; TCPS_LISTEN |
||
924 | dd .ack_processed ; TCPS_SYN_SENT |
||
925 | dd .ack_processed ; TCPS_SYN_RECEIVED |
||
926 | dd .ack_processed ; TCPS_ESTABLISHED |
||
927 | dd .ack_processed ; TCPS_CLOSE_WAIT |
||
928 | dd .ack_fw1 ; TCPS_FIN_WAIT_1 |
||
929 | dd .ack_c ; TCPS_CLOSING |
||
930 | dd .ack_la ; TCPS_LAST_ACK |
||
931 | dd .ack_processed ; TCPS_FIN_WAIT_2 |
||
932 | dd .ack_tw ; TCPS_TIMED_WAIT |
||
1733 | hidnplayr | 933 | |
934 | |||
1772 | hidnplayr | 935 | .ack_fw1: |
2891 | hidnplayr | 936 | jnc .ack_processed |
1733 | hidnplayr | 937 | |
2390 | hidnplayr | 938 | test [ebx + SOCKET.state], SS_CANTRCVMORE |
939 | jnz @f |
||
940 | mov eax, ebx |
||
941 | call SOCKET_is_disconnected |
||
2891 | hidnplayr | 942 | ;;; mov [ebx + TCP_SOCKET.timer_timed_wait], TCP_time_max_idle ; FIXME |
1772 | hidnplayr | 943 | @@: |
1733 | hidnplayr | 944 | |
2390 | hidnplayr | 945 | mov [ebx + TCP_SOCKET.t_state], TCPS_FIN_WAIT_2 |
946 | jmp .ack_processed |
||
1733 | hidnplayr | 947 | |
1772 | hidnplayr | 948 | .ack_c: |
2891 | hidnplayr | 949 | jnc .ack_processed |
1772 | hidnplayr | 950 | |
2390 | hidnplayr | 951 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
952 | mov eax, ebx |
||
953 | call TCP_cancel_timers |
||
954 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
955 | mov eax, ebx |
||
956 | call SOCKET_is_disconnected |
||
957 | jmp .ack_processed |
||
1733 | hidnplayr | 958 | |
1772 | hidnplayr | 959 | .ack_la: |
2891 | hidnplayr | 960 | jnc .ack_processed |
1733 | hidnplayr | 961 | |
2390 | hidnplayr | 962 | mov eax, ebx |
2882 | hidnplayr | 963 | call TCP_disconnect |
2390 | hidnplayr | 964 | jmp .drop |
1733 | hidnplayr | 965 | |
1772 | hidnplayr | 966 | .ack_tw: |
2390 | hidnplayr | 967 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
968 | jmp .drop_after_ack |
||
1733 | hidnplayr | 969 | |
2930 | hidnplayr | 970 | .reset_dupacks: ; We got a new ACK, reset duplicate ACK counter |
971 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
||
972 | jmp .ack_processed |
||
1733 | hidnplayr | 973 | |
1772 | hidnplayr | 974 | |
1733 | hidnplayr | 975 | |
2930 | hidnplayr | 976 | ;------------- |
977 | ; Passive Open |
||
1733 | hidnplayr | 978 | |
2930 | hidnplayr | 979 | align 4 |
980 | |||
981 | .accept_connection: |
||
982 | |||
983 | DEBUGF 1,"TCP_input: Accepting new connection\n" |
||
984 | |||
985 | pusha |
||
986 | lea ecx, [ebx + SOCKET.mutex] |
||
987 | call mutex_unlock |
||
988 | popa |
||
989 | |||
990 | push ecx edx esi edi ;;; |
||
991 | call SOCKET_fork |
||
992 | pop edi esi edx ecx |
||
993 | |||
994 | test eax, eax |
||
995 | jz .drop |
||
996 | |||
997 | push dword [edi + 4] ; Ipv4 destination addres |
||
998 | pop [eax + IP_SOCKET.LocalIP] |
||
999 | |||
1000 | push [edx + TCP_header.DestinationPort] |
||
1001 | pop [eax + TCP_SOCKET.LocalPort] |
||
1002 | |||
1003 | mov [eax + TCP_SOCKET.t_state], TCPS_LISTEN |
||
1004 | mov ebx, eax |
||
1005 | |||
1006 | .LISTEN: |
||
1007 | |||
1008 | DEBUGF 1,"TCP_input: state=listen\n" |
||
1009 | |||
1010 | test [edx + TCP_header.Flags], TH_RST ;;; TODO: kill new socket on error |
||
1011 | jnz .drop |
||
1012 | |||
1013 | test [edx + TCP_header.Flags], TH_ACK |
||
1014 | jnz .drop_with_reset |
||
1015 | |||
1016 | test [edx + TCP_header.Flags], TH_SYN |
||
1017 | jz .drop |
||
1018 | |||
1019 | ;;; TODO: check if it's a broadcast or multicast, and drop if so |
||
1020 | |||
1021 | push dword [edi] ; Ipv4 source addres |
||
1022 | pop [ebx + IP_SOCKET.RemoteIP] |
||
1023 | |||
1024 | push [edx + TCP_header.SourcePort] |
||
1025 | pop [ebx + TCP_SOCKET.RemotePort] |
||
1026 | |||
1027 | push [edx + TCP_header.SequenceNumber] |
||
1028 | pop [ebx + TCP_SOCKET.IRS] |
||
1029 | |||
1030 | mov eax, [TCP_sequence_num] |
||
1031 | add [TCP_sequence_num], 64000 / 2 |
||
1032 | mov [ebx + TCP_SOCKET.ISS], eax |
||
1033 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1034 | |||
1035 | TCP_sendseqinit ebx |
||
1036 | TCP_rcvseqinit ebx |
||
1037 | |||
1038 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
||
1039 | mov [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1040 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval ;;;; macro |
||
1041 | |||
1042 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1043 | call SOCKET_ring_create |
||
1044 | |||
1045 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
1046 | call SOCKET_ring_create |
||
1047 | |||
1048 | ;;; call SOCKET_notify_owner |
||
1049 | |||
1050 | jmp .trim_then_step6 |
||
1051 | |||
1052 | |||
1053 | |||
1054 | |||
1055 | |||
1056 | |||
1057 | |||
1058 | |||
1059 | |||
1060 | |||
1061 | ;------------ |
||
1062 | ; Active Open |
||
1063 | |||
1064 | align 4 |
||
1065 | .SYN_SENT: |
||
1066 | |||
1067 | DEBUGF 1,"TCP_input: state=syn_sent\n" |
||
1068 | |||
1069 | test [edx + TCP_header.Flags], TH_ACK |
||
1070 | jz @f |
||
1071 | |||
1072 | mov eax, [edx + TCP_header.AckNumber] |
||
1073 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
1074 | jbe .drop_with_reset |
||
1075 | |||
1076 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
1077 | ja .drop_with_reset |
||
1078 | @@: |
||
1079 | |||
1080 | test [edx + TCP_header.Flags], TH_RST |
||
1081 | jz @f |
||
1082 | |||
1083 | test [edx + TCP_header.Flags], TH_ACK |
||
1084 | jz .drop |
||
1085 | |||
1086 | mov eax, ebx |
||
1087 | mov ebx, ECONNREFUSED |
||
1088 | call TCP_drop |
||
1089 | |||
1090 | jmp .drop |
||
1091 | @@: |
||
1092 | |||
1093 | test [edx + TCP_header.Flags], TH_SYN |
||
1094 | jz .drop |
||
1095 | |||
1096 | ; at this point, segment seems to be valid |
||
1097 | |||
1098 | test [edx + TCP_header.Flags], TH_ACK |
||
1099 | jz .no_syn_ack |
||
1100 | |||
1101 | ; now, process received SYN in response to an active open |
||
1102 | |||
1103 | mov eax, [edx + TCP_header.AckNumber] |
||
1104 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
1105 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
1106 | jbe @f |
||
1107 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1108 | @@: |
||
1109 | |||
1110 | .no_syn_ack: |
||
1111 | |||
1112 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 ; disable retransmission |
||
1113 | |||
1114 | push [edx + TCP_header.SequenceNumber] |
||
1115 | pop [ebx + TCP_SOCKET.IRS] |
||
1116 | |||
1117 | TCP_rcvseqinit ebx |
||
1118 | |||
1119 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1120 | |||
1121 | mov eax, [ebx + TCP_SOCKET.SND_UNA] |
||
1122 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
1123 | jbe .simultaneous_open |
||
1124 | |||
1125 | test [edx + TCP_header.Flags], TH_ACK |
||
1126 | jz .simultaneous_open |
||
1127 | |||
1128 | DEBUGF 1,"TCP_input: active open\n" |
||
1129 | |||
1130 | ;;; TODO: update stats |
||
1131 | |||
1132 | ; set socket state to connected |
||
1133 | mov [ebx + SOCKET.state], SS_ISCONNECTED |
||
1134 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
||
1135 | |||
1136 | ;;; TODO: check if we should scale the connection (567-572) |
||
1137 | mov [ebx + TCP_SOCKET.SND_SCALE], 0 |
||
1138 | |||
1139 | ;;; TODO: update RTT estimators |
||
1140 | |||
1141 | jmp .trim_then_step6 |
||
1142 | |||
1143 | .simultaneous_open: |
||
1144 | |||
1145 | DEBUGF 1,"TCP_input: simultaneous open\n" |
||
1146 | ; We have received a syn but no ACK, so we are having a simultaneous open.. |
||
1147 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
||
1148 | |||
1149 | ;------------------------------------- |
||
1150 | ; Common processing for receipt of SYN |
||
1151 | |||
1152 | .trim_then_step6: |
||
1153 | |||
1154 | inc [edx + TCP_header.SequenceNumber] |
||
1155 | |||
1156 | ;;; TODO: Drop any received data that follows receive window (590) |
||
1157 | |||
1158 | mov eax, [edx + TCP_header.SequenceNumber] |
||
1159 | mov [ebx + TCP_SOCKET.RCV_UP], eax |
||
1160 | dec eax |
||
1161 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
1162 | |||
1163 | jmp .ack_processed |
||
1164 | |||
1165 | |||
1166 | |||
2390 | hidnplayr | 1167 | .ack_processed: ; (step 6) |
1733 | hidnplayr | 1168 | |
2891 | hidnplayr | 1169 | DEBUGF 1,"TCP_input: ACK processed\n" |
1733 | hidnplayr | 1170 | |
1171 | ;---------------------------------------------- |
||
1172 | ; check if we need to update window information |
||
1173 | |||
2390 | hidnplayr | 1174 | test [edx + TCP_header.Flags], TH_ACK |
1175 | jz .no_window_update |
||
1733 | hidnplayr | 1176 | |
2390 | hidnplayr | 1177 | mov eax, [ebx + TCP_SOCKET.SND_WL1] |
1178 | cmp eax, [edx + TCP_header.SequenceNumber] |
||
1179 | jb .update_window |
||
1180 | ja @f |
||
1733 | hidnplayr | 1181 | |
2390 | hidnplayr | 1182 | mov eax, [ebx + TCP_SOCKET.SND_WL2] |
1183 | cmp eax, [edx + TCP_header.AckNumber] |
||
1184 | jb .update_window |
||
1185 | ja .no_window_update |
||
1733 | hidnplayr | 1186 | @@: |
1187 | |||
2390 | hidnplayr | 1188 | mov eax, [ebx + TCP_SOCKET.SND_WL2] |
1189 | cmp eax, [edx + TCP_header.AckNumber] |
||
1190 | jne .no_window_update |
||
1733 | hidnplayr | 1191 | |
2390 | hidnplayr | 1192 | mov eax, dword [edx + TCP_header.Window] |
1193 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
1194 | jbe .no_window_update |
||
1733 | hidnplayr | 1195 | |
1196 | .update_window: |
||
1197 | |||
2612 | hidnplayr | 1198 | ;;; TODO: Keep track of pure window updates |
1733 | hidnplayr | 1199 | |
2390 | hidnplayr | 1200 | mov eax, dword [edx + TCP_header.Window] |
1201 | cmp eax, [ebx + TCP_SOCKET.max_sndwnd] |
||
1202 | jbe @f |
||
1203 | mov [ebx + TCP_SOCKET.max_sndwnd], eax |
||
1733 | hidnplayr | 1204 | @@: |
2390 | hidnplayr | 1205 | mov [ebx + TCP_SOCKET.SND_WND], eax |
1733 | hidnplayr | 1206 | |
2891 | hidnplayr | 1207 | DEBUGF 1,"TCP_input: Updating window to %u\n", eax |
2612 | hidnplayr | 1208 | |
2390 | hidnplayr | 1209 | push [edx + TCP_header.SequenceNumber] |
1210 | pop [ebx + TCP_SOCKET.SND_WL1] |
||
1733 | hidnplayr | 1211 | |
2390 | hidnplayr | 1212 | push [edx + TCP_header.AckNumber] |
1213 | pop [ebx + TCP_SOCKET.SND_WL2] |
||
1733 | hidnplayr | 1214 | |
2891 | hidnplayr | 1215 | inc [ebx + TCP_SOCKET.sendalot] |
1733 | hidnplayr | 1216 | |
1217 | .no_window_update: |
||
1218 | |||
1219 | |||
1220 | |||
1221 | |||
1222 | |||
1223 | |||
1224 | |||
1225 | ;----------------- |
||
1226 | ; process URG flag |
||
1227 | |||
2390 | hidnplayr | 1228 | test [edx + TCP_header.Flags], TH_URG |
1229 | jz .not_urgent |
||
1733 | hidnplayr | 1230 | |
2390 | hidnplayr | 1231 | cmp [edx + TCP_header.UrgentPointer], 0 |
1232 | jz .not_urgent |
||
1733 | hidnplayr | 1233 | |
2390 | hidnplayr | 1234 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1235 | je .not_urgent |
||
1733 | hidnplayr | 1236 | |
1237 | ; Ignore bogus urgent offsets |
||
1238 | |||
2390 | hidnplayr | 1239 | ;;; 1040-1050 |
1733 | hidnplayr | 1240 | |
2390 | hidnplayr | 1241 | movzx eax, [edx + TCP_header.UrgentPointer] |
1242 | add eax, [ebx + STREAM_SOCKET.rcv.size] |
||
1243 | cmp eax, SOCKET_MAXDATA |
||
1244 | jbe .not_urgent |
||
1733 | hidnplayr | 1245 | |
2390 | hidnplayr | 1246 | mov [edx + TCP_header.UrgentPointer], 0 |
1247 | and [edx + TCP_header.Flags], not (TH_URG) |
||
1248 | jmp .do_data |
||
1733 | hidnplayr | 1249 | |
1250 | .not_urgent: |
||
1251 | |||
1252 | ; processing of received urgent pointer |
||
1253 | |||
2390 | hidnplayr | 1254 | ;;; TODO (1051-1093) |
1733 | hidnplayr | 1255 | |
1256 | |||
2891 | hidnplayr | 1257 | ;--------------------------------------- |
1258 | ; process the data in the segment (1094) |
||
1733 | hidnplayr | 1259 | |
1260 | .do_data: |
||
1261 | |||
2891 | hidnplayr | 1262 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1263 | jae .final_processing |
||
1733 | hidnplayr | 1264 | |
2390 | hidnplayr | 1265 | test [edx + TCP_header.Flags], TH_FIN |
2891 | hidnplayr | 1266 | jnz @f |
1733 | hidnplayr | 1267 | |
2390 | hidnplayr | 1268 | test ecx, ecx |
2891 | hidnplayr | 1269 | jnz .final_processing |
1270 | @@: |
||
1733 | hidnplayr | 1271 | |
2891 | hidnplayr | 1272 | ; call TCP_reassemble ;;; TODO |
1733 | hidnplayr | 1273 | |
1274 | ;--------------- |
||
1275 | ; FIN processing |
||
1276 | |||
2891 | hidnplayr | 1277 | test [edx + TCP_header.Flags], TH_FIN |
2930 | hidnplayr | 1278 | jz .final_processing |
1733 | hidnplayr | 1279 | |
2891 | hidnplayr | 1280 | DEBUGF 1,"TCP_input: Processing FIN\n" |
1733 | hidnplayr | 1281 | |
2891 | hidnplayr | 1282 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1283 | jae .not_first_fin |
||
1774 | hidnplayr | 1284 | |
2891 | hidnplayr | 1285 | DEBUGF 1,"TCP_input: First FIN for this connection\n" |
1774 | hidnplayr | 1286 | |
2390 | hidnplayr | 1287 | mov eax, ebx |
1288 | call SOCKET_cant_recv_more |
||
1774 | hidnplayr | 1289 | |
2390 | hidnplayr | 1290 | mov [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1291 | inc [ebx + TCP_SOCKET.RCV_NXT] |
||
1774 | hidnplayr | 1292 | |
1293 | .not_first_fin: |
||
2390 | hidnplayr | 1294 | mov eax, [ebx + TCP_SOCKET.t_state] |
1295 | shl eax, 2 |
||
1296 | jmp dword [eax + .FIN_sw_list] |
||
1733 | hidnplayr | 1297 | |
1298 | .FIN_sw_list: |
||
2930 | hidnplayr | 1299 | dd .final_processing ; TCPS_CLOSED |
1300 | dd .final_processing ; TCPS_LISTEN |
||
1301 | dd .final_processing ; TCPS_SYN_SENT |
||
2891 | hidnplayr | 1302 | dd .fin_syn_est ; TCPS_SYN_RECEIVED |
1303 | dd .fin_syn_est ; TCPS_ESTABLISHED |
||
2930 | hidnplayr | 1304 | dd .final_processing ; TCPS_CLOSE_WAIT |
2891 | hidnplayr | 1305 | dd .fin_wait1 ; TCPS_FIN_WAIT_1 |
2930 | hidnplayr | 1306 | dd .final_processing ; TCPS_CLOSING |
1307 | dd .final_processing ; TCPS_LAST_ACK |
||
2891 | hidnplayr | 1308 | dd .fin_wait2 ; TCPS_FIN_WAIT_2 |
1309 | dd .fin_timed ; TCPS_TIMED_WAIT |
||
1733 | hidnplayr | 1310 | |
1311 | .fin_syn_est: |
||
1312 | |||
2390 | hidnplayr | 1313 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
2930 | hidnplayr | 1314 | jmp .final_processing |
1733 | hidnplayr | 1315 | |
1316 | .fin_wait1: |
||
1317 | |||
2390 | hidnplayr | 1318 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSING |
2930 | hidnplayr | 1319 | jmp .final_processing |
1733 | hidnplayr | 1320 | |
1321 | .fin_wait2: |
||
1322 | |||
2390 | hidnplayr | 1323 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1324 | mov eax, ebx |
||
1325 | call TCP_cancel_timers |
||
1326 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
1327 | call SOCKET_is_disconnected |
||
2930 | hidnplayr | 1328 | jmp .final_processing |
1733 | hidnplayr | 1329 | |
1330 | .fin_timed: |
||
2390 | hidnplayr | 1331 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
2930 | hidnplayr | 1332 | jmp .final_processing |
1733 | hidnplayr | 1333 | |
1334 | |||
2930 | hidnplayr | 1335 | .drop_after_ack: |
1336 | DEBUGF 1,"TCP_input: Drop after ACK\n" |
||
1733 | hidnplayr | 1337 | |
2930 | hidnplayr | 1338 | push edx ebx |
2891 | hidnplayr | 1339 | lea ecx, [ebx + SOCKET.mutex] |
1340 | call mutex_unlock |
||
2930 | hidnplayr | 1341 | pop eax edx |
2891 | hidnplayr | 1342 | |
2930 | hidnplayr | 1343 | test [edx + TCP_header.Flags], TH_RST |
1344 | jnz .dumpit |
||
1733 | hidnplayr | 1345 | |
2930 | hidnplayr | 1346 | or [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
1347 | jmp .need_output |
||
2891 | hidnplayr | 1348 | |
1733 | hidnplayr | 1349 | |
2891 | hidnplayr | 1350 | |
2930 | hidnplayr | 1351 | .drop_with_reset: |
1352 | DEBUGF 1,"TCP_input: Drop with reset\n" |
||
1353 | |||
1354 | push ebx edx |
||
2402 | hidnplayr | 1355 | lea ecx, [ebx + SOCKET.mutex] |
1356 | call mutex_unlock |
||
2930 | hidnplayr | 1357 | pop edx ebx |
1733 | hidnplayr | 1358 | |
2930 | hidnplayr | 1359 | test [edx + TCP_header.Flags], TH_RST |
1360 | jnz .dumpit |
||
1733 | hidnplayr | 1361 | |
2930 | hidnplayr | 1362 | ;;; if its a multicast/broadcast, also drop |
1733 | hidnplayr | 1363 | |
2930 | hidnplayr | 1364 | test [edx + TCP_header.Flags], TH_ACK |
1365 | jnz .respond_ack |
||
1733 | hidnplayr | 1366 | |
2930 | hidnplayr | 1367 | test [edx + TCP_header.Flags], TH_SYN |
1368 | jnz .respond_syn |
||
1369 | jmp .dumpit |
||
1733 | hidnplayr | 1370 | |
2930 | hidnplayr | 1371 | ;----------------- |
1372 | ; Final processing |
||
1733 | hidnplayr | 1373 | |
2930 | hidnplayr | 1374 | .final_processing: |
1375 | DEBUGF 1,"TCP_input: Final processing\n" |
||
1733 | hidnplayr | 1376 | |
2930 | hidnplayr | 1377 | push ebx |
1378 | lea ecx, [ebx + SOCKET.mutex] |
||
1379 | call mutex_unlock |
||
1380 | pop eax |
||
1733 | hidnplayr | 1381 | |
2930 | hidnplayr | 1382 | cmp [eax + TCP_SOCKET.sendalot], 0 |
1383 | jne .need_output |
||
1733 | hidnplayr | 1384 | |
2930 | hidnplayr | 1385 | test [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
1386 | jz .dumpit |
||
1387 | DEBUGF 1,"TCP_input: ACK now!\n" |
||
1733 | hidnplayr | 1388 | |
2930 | hidnplayr | 1389 | .need_output: |
1390 | call TCP_output |
||
1733 | hidnplayr | 1391 | |
2930 | hidnplayr | 1392 | .dumpit: |
1393 | DEBUGF 1,"TCP_input: dumping\n" |
||
1733 | hidnplayr | 1394 | |
2390 | hidnplayr | 1395 | call kernel_free |
1396 | add esp, 4 |
||
1397 | ret |
||
1733 | hidnplayr | 1398 | |
1399 | |||
1400 | |||
1401 | |||
1402 | |||
1403 | .respond_ack: |
||
1404 | |||
2390 | hidnplayr | 1405 | push ebx |
1406 | mov cl, TH_RST |
||
1407 | call TCP_respond_socket |
||
1408 | pop ebx |
||
1409 | jmp .destroy_new_socket |
||
1733 | hidnplayr | 1410 | |
1411 | |||
1412 | .respond_syn: |
||
1413 | |||
2390 | hidnplayr | 1414 | push ebx |
1415 | mov cl, TH_RST + TH_ACK |
||
1416 | call TCP_respond_socket |
||
1417 | pop ebx |
||
1418 | jmp .destroy_new_socket |
||
1733 | hidnplayr | 1419 | |
1420 | |||
1421 | |||
1422 | |||
1423 | |||
1424 | ;----- |
||
1425 | ; Drop |
||
1426 | |||
2930 | hidnplayr | 1427 | .drop: |
1733 | hidnplayr | 1428 | |
2402 | hidnplayr | 1429 | pusha |
1430 | lea ecx, [ebx + SOCKET.mutex] |
||
1431 | call mutex_unlock |
||
1432 | popa |
||
1733 | hidnplayr | 1433 | |
2930 | hidnplayr | 1434 | .drop_not_locked: |
1733 | hidnplayr | 1435 | |
2891 | hidnplayr | 1436 | DEBUGF 1,"TCP_input: Dropping packet\n" |
1733 | hidnplayr | 1437 | |
2390 | hidnplayr | 1438 | ;;;; If debugging options are enabled, output the packet somwhere |
1733 | hidnplayr | 1439 | |
1440 | .destroy_new_socket: |
||
1441 | |||
2390 | hidnplayr | 1442 | ;;;; kill the newly created socket |
1733 | hidnplayr | 1443 | |
2930 | hidnplayr | 1444 | .drop_no_socket: |
1445 | DEBUGF 1,"TCP_input: Drop (no socket)\n" |
||
1446 | |||
2390 | hidnplayr | 1447 | call kernel_free |
1448 | add esp, 4 |
||
2600 | hidnplayr | 1449 | ret |
1450 | |||
2930 | hidnplayr | 1451 | .drop_with_reset_no_socket: |
2600 | hidnplayr | 1452 | |
2891 | hidnplayr | 1453 | DEBUGF 1,"TCP_input: Drop with reset (no socket)\n" |
2600 | hidnplayr | 1454 | |
1455 | test [edx + TCP_header.Flags], TH_RST |
||
1456 | jnz .drop_no_socket |
||
1457 | |||
1458 | ;;; if its a multicast/broadcast, also drop |
||
1459 | |||
1460 | test [edx + TCP_header.Flags], TH_ACK |
||
1461 | jnz .respond_seg_ack |
||
1462 | |||
1463 | test [edx + TCP_header.Flags], TH_SYN |
||
1464 | jnz .respond_seg_syn |
||
1465 | |||
2930 | hidnplayr | 1466 | jmp .drop_no_socket |
2600 | hidnplayr | 1467 | |
1468 | .respond_seg_ack: |
||
1469 | |||
1470 | mov cl, TH_RST |
||
1471 | call TCP_respond_segment |
||
1472 | jmp .drop_no_socket |
||
1473 | |||
1474 | .respond_seg_syn: |
||
1475 | |||
1476 | mov cl, TH_RST + TH_ACK |
||
1477 | call TCP_respond_segment |
||
1478 | jmp .drop_no_socket |