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1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
2 | ;; ;; |
3 | ;; Copyright (C) KolibriOS team 2004-2015. All rights reserved. ;; |
3 | ;; Copyright (C) KolibriOS team 2004-2015. All rights reserved. ;; |
4 | ;; Distributed under terms of the GNU General Public License ;; |
4 | ;; Distributed under terms of the GNU General Public License ;; |
5 | ;; ;; |
5 | ;; ;; |
6 | ;; Part of the TCP/IP network stack for KolibriOS ;; |
6 | ;; Part of the TCP/IP network stack for KolibriOS ;; |
7 | ;; ;; |
7 | ;; ;; |
8 | ;; Written by hidnplayr@kolibrios.org ;; |
8 | ;; Written by hidnplayr@kolibrios.org ;; |
9 | ;; ;; |
9 | ;; ;; |
10 | ;; Based on the algorithms used in 4.4BSD ;; |
10 | ;; Based on the algorithms used in 4.4BSD ;; |
11 | ;; ;; |
11 | ;; ;; |
12 | ;; GNU GENERAL PUBLIC LICENSE ;; |
12 | ;; GNU GENERAL PUBLIC LICENSE ;; |
13 | ;; Version 2, June 1991 ;; |
13 | ;; Version 2, June 1991 ;; |
14 | ;; ;; |
14 | ;; ;; |
15 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
15 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
16 | 16 | ||
17 | $Revision: 5522 $ |
- | |
18 | - | ||
19 | ;----------------------------------------------------------------- |
- | |
20 | ; |
- | |
21 | ; TCP_input: |
- | |
22 | ; |
- | |
23 | ; Add a segment to the incoming TCP queue |
- | |
24 | ; |
- | |
25 | ; IN: [esp] = ptr to buffer |
- | |
26 | ; ebx = ptr to device struct |
- | |
27 | ; ecx = segment size |
- | |
28 | ; esi = ptr to TCP segment |
- | |
29 | ; edi = ptr to ipv4 source address, followed by ipv4 dest address |
- | |
30 | ; |
- | |
31 | ; OUT: / |
- | |
32 | ; |
- | |
- | 17 | $Revision: 5976 $ |
|
- | 18 | ||
- | 19 | ;-----------------------------------------------------------------; |
|
- | 20 | ; ; |
|
- | 21 | ; TCP_input: Add a segment to the incoming TCP queue. ; |
|
- | 22 | ; ; |
|
- | 23 | ; IN: [esp] = ptr to buffer ; |
|
- | 24 | ; ebx = ptr to device struct ; |
|
- | 25 | ; ecx = TCP segment size ; |
|
- | 26 | ; edx = ptr to IPv4 header ; |
|
- | 27 | ; esi = ptr to TCP segment ; |
|
- | 28 | ; edi = interface number*4 ; |
|
- | 29 | ; ; |
|
- | 30 | ; OUT: / ; |
|
33 | ;----------------------------------------------------------------- |
31 | ; ; |
34 | 32 | ;-----------------------------------------------------------------; |
|
35 | align 4 |
33 | align 4 |
36 | TCP_input: |
34 | TCP_input: |
37 | 35 | ||
38 | ; record the current time |
36 | ; record the current time |
39 | push [timer_ticks] ; in 1/100 seconds |
37 | push [timer_ticks] ; in 1/100 seconds |
40 | push ebx ecx esi edi ; mind the order (see TCP_queue_entry struct) |
38 | push ebx ecx esi edx ; mind the order (see TCP_queue_entry struct) |
41 | mov esi, esp |
39 | mov esi, esp |
- | 40 | ||
42 | 41 | push edi |
|
- | 42 | add_to_queue TCP_queue, TCP_QUEUE_SIZE, sizeof.TCP_queue_entry, .fail |
|
43 | add_to_queue TCP_queue, TCP_QUEUE_SIZE, sizeof.TCP_queue_entry, .fail |
43 | pop edi |
44 | add esp, sizeof.TCP_queue_entry |
- | |
45 | 44 | add esp, sizeof.TCP_queue_entry |
|
46 | call NET_ptr_to_num4 |
45 | |
47 | inc [TCP_segments_rx + edi] |
46 | inc [TCP_segments_rx + edi] |
48 | 47 | ||
49 | xor edx, edx |
48 | xor edx, edx |
50 | mov eax, [TCP_input_event] |
49 | mov eax, [TCP_input_event] |
51 | mov ebx, [eax + EVENT.id] |
50 | mov ebx, [eax + EVENT.id] |
52 | xor esi, esi |
51 | xor esi, esi |
53 | call raise_event |
52 | call raise_event |
54 | 53 | ||
55 | ret |
54 | ret |
56 | 55 | ||
57 | .fail: |
56 | .fail: |
- | 57 | pop edi |
|
58 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP incoming queue is full, discarding packet!\n" |
58 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP incoming queue is full, discarding packet!\n" |
59 | 59 | ||
60 | call NET_ptr_to_num4 |
60 | call NET_ptr_to_num4 |
61 | inc [TCP_segments_missed + edi] |
61 | inc [TCP_segments_missed + edi] |
62 | 62 | ||
63 | add esp, sizeof.TCP_queue_entry - 8 |
63 | add esp, sizeof.TCP_queue_entry - 4 |
64 | call NET_BUFF_free |
64 | call NET_BUFF_free |
65 | ret |
65 | ret |
66 | 66 | ||
67 | 67 | ||
68 | 68 | ||
69 | align 4 |
69 | align 4 |
70 | proc TCP_process_input |
70 | proc TCP_process_input |
71 | 71 | ||
72 | locals |
72 | locals |
73 | dataoffset dd ? |
73 | dataoffset dd ? |
74 | timestamp dd ? |
74 | timestamp dd ? |
75 | temp_bits db ? |
75 | temp_bits db ? |
76 | endl |
76 | endl |
77 | 77 | ||
78 | xor esi, esi |
78 | xor esi, esi |
79 | mov ecx, MANUAL_DESTROY |
79 | mov ecx, MANUAL_DESTROY |
80 | call create_event |
80 | call create_event |
81 | mov [TCP_input_event], eax |
81 | mov [TCP_input_event], eax |
82 | 82 | ||
83 | .wait: |
83 | .wait: |
84 | mov eax, [TCP_input_event] |
84 | mov eax, [TCP_input_event] |
85 | mov ebx, [eax + EVENT.id] |
85 | mov ebx, [eax + EVENT.id] |
86 | call wait_event |
86 | call wait_event |
87 | 87 | ||
88 | .loop: |
88 | .loop: |
89 | get_from_queue TCP_queue, TCP_QUEUE_SIZE, sizeof.TCP_queue_entry, .wait |
89 | get_from_queue TCP_queue, TCP_QUEUE_SIZE, sizeof.TCP_queue_entry, .wait |
90 | 90 | ||
91 | push [esi + TCP_queue_entry.timestamp] |
91 | push [esi + TCP_queue_entry.timestamp] |
92 | pop [timestamp] |
92 | pop [timestamp] |
93 | push [esi + TCP_queue_entry.buffer_ptr] |
93 | push [esi + TCP_queue_entry.buffer_ptr] |
94 | 94 | ||
95 | mov ebx, [esi + TCP_queue_entry.device_ptr] |
95 | mov ebx, [esi + TCP_queue_entry.device_ptr] |
96 | mov ecx, [esi + TCP_queue_entry.segment_size] |
96 | mov ecx, [esi + TCP_queue_entry.segment_size] |
97 | mov edi, [esi + TCP_queue_entry.ip_ptr] ; ptr to ipv4 source address, followed by ipv4 destination address |
97 | mov edi, [esi + TCP_queue_entry.ip_ptr] ; ptr to ipv4 header |
98 | mov esi, [esi + TCP_queue_entry.segment_ptr] ; change esi last |
98 | mov esi, [esi + TCP_queue_entry.segment_ptr] ; change esi last |
99 | 99 | ||
100 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: size=%u time=%d\n", ecx, [timer_ticks] |
100 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: size=%u time=%d\n", ecx, [timer_ticks] |
101 | 101 | ||
102 | mov edx, esi |
102 | mov edx, esi |
103 | 103 | ||
104 | cmp ebx, LOOPBACK_DEVICE |
104 | cmp ebx, LOOPBACK_DEVICE |
105 | je .checksum_ok |
105 | je .checksum_ok |
106 | 106 | ||
107 | ; re-calculate the checksum (if not already done by hw) |
107 | ; re-calculate the checksum (if not already done by hw) |
108 | test [ebx + NET_DEVICE.hwacc], NET_HWACC_TCP_IPv4_IN |
108 | test [ebx + NET_DEVICE.hwacc], NET_HWACC_TCP_IPv4_IN |
109 | jnz .checksum_ok |
109 | jnz .checksum_ok |
110 | 110 | ||
111 | push ecx esi |
111 | push ecx esi |
112 | pushw [esi + TCP_header.Checksum] |
112 | pushw [esi + TCP_header.Checksum] |
113 | mov [esi + TCP_header.Checksum], 0 |
113 | mov [esi + TCP_header.Checksum], 0 |
114 | TCP_checksum (edi), (edi+4) |
114 | TCP_checksum (edi+IPv4_header.SourceAddress), (edi+IPv4_header.DestinationAddress) |
115 | pop cx ; previous checksum |
115 | pop cx ; previous checksum |
116 | cmp cx, dx |
116 | cmp cx, dx |
117 | pop edx ecx |
117 | pop edx ecx |
118 | jne .drop_no_socket |
118 | jne .drop_no_socket |
119 | .checksum_ok: |
119 | .checksum_ok: |
120 | 120 | ||
121 | ; Verify the data offset |
121 | ; Verify the data offset |
122 | movzx eax, [edx + TCP_header.DataOffset] |
122 | movzx eax, [edx + TCP_header.DataOffset] |
123 | and al, 0xf0 ; Calculate TCP segment header size (throwing away unused reserved bits in TCP header) |
123 | and al, 0xf0 ; Calculate TCP segment header size (throwing away unused reserved bits in TCP header) |
124 | shr al, 2 |
124 | shr al, 2 |
125 | cmp al, sizeof.TCP_header ; Now see if it's at least the size of a standard TCP header |
125 | cmp al, sizeof.TCP_header ; Now see if it's at least the size of a standard TCP header |
126 | jb .drop_no_socket ; If not, drop the packet |
126 | jb .drop_no_socket ; If not, drop the packet |
127 | mov [dataoffset], eax |
127 | mov [dataoffset], eax |
128 | 128 | ||
129 | sub ecx, eax ; substract TCP header size from total segment size |
129 | sub ecx, eax ; substract TCP header size from total segment size |
130 | jb .drop_no_socket ; If total segment size is less then the advertised header size, drop packet |
130 | jb .drop_no_socket ; If total segment size is less then the advertised header size, drop packet |
131 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: %u bytes of data\n", ecx |
131 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: %u bytes of data\n", ecx |
132 | 132 | ||
133 | ;------------------------------------------- |
133 | ;------------------------------------------- |
134 | ; Convert Big-endian values to little endian |
134 | ; Convert Big-endian values to little endian |
135 | 135 | ||
136 | ntohd [edx + TCP_header.SequenceNumber] |
136 | ntohd [edx + TCP_header.SequenceNumber] |
137 | ntohd [edx + TCP_header.AckNumber] |
137 | ntohd [edx + TCP_header.AckNumber] |
138 | 138 | ||
139 | ntohw [edx + TCP_header.Window] |
139 | ntohw [edx + TCP_header.Window] |
140 | ntohw [edx + TCP_header.UrgentPointer] |
140 | ntohw [edx + TCP_header.UrgentPointer] |
141 | 141 | ||
142 | ;------------------------ |
142 | ;------------------------ |
143 | ; Find the socket pointer |
143 | ; Find the socket pointer |
144 | 144 | ||
145 | ; IP Packet TCP Destination Port = local Port |
145 | ; IP Packet TCP Destination Port = local Port |
146 | ; (IP Packet SenderAddress = Remote IP) OR (Remote IP = 0) |
146 | ; (IP Packet SenderAddress = Remote IP) OR (Remote IP = 0) |
147 | ; (IP Packet TCP Source Port = remote Port) OR (remote Port = 0) |
147 | ; (IP Packet TCP Source Port = remote Port) OR (remote Port = 0) |
148 | 148 | ||
149 | .findpcb: |
149 | .findpcb: |
150 | pusha |
150 | pusha |
151 | mov ecx, socket_mutex |
151 | mov ecx, socket_mutex |
152 | call mutex_lock |
152 | call mutex_lock |
153 | popa |
153 | popa |
154 | 154 | ||
155 | mov ebx, net_sockets |
155 | mov ebx, net_sockets |
156 | mov si, [edx + TCP_header.DestinationPort] |
156 | mov si, [edx + TCP_header.DestinationPort] |
157 | 157 | ||
158 | .socket_loop: |
158 | .socket_loop: |
159 | mov ebx, [ebx + SOCKET.NextPtr] |
159 | mov ebx, [ebx + SOCKET.NextPtr] |
160 | or ebx, ebx |
160 | or ebx, ebx |
161 | jz .no_socket ;respond_seg_reset |
161 | jz .no_socket ;respond_seg_reset |
162 | 162 | ||
163 | cmp [ebx + SOCKET.Domain], AF_INET4 |
163 | cmp [ebx + SOCKET.Domain], AF_INET4 |
164 | jne .socket_loop |
164 | jne .socket_loop |
165 | 165 | ||
166 | cmp [ebx + SOCKET.Protocol], IP_PROTO_TCP |
166 | cmp [ebx + SOCKET.Protocol], IP_PROTO_TCP |
167 | jne .socket_loop |
167 | jne .socket_loop |
168 | 168 | ||
169 | cmp [ebx + TCP_SOCKET.LocalPort], si |
169 | cmp [ebx + TCP_SOCKET.LocalPort], si |
170 | jne .socket_loop |
170 | jne .socket_loop |
171 | 171 | ||
172 | mov eax, [ebx + IP_SOCKET.RemoteIP] |
172 | mov eax, [ebx + IP_SOCKET.RemoteIP] |
173 | cmp eax, [edi] ; Ipv4 source address |
173 | cmp eax, [edi + IPv4_header.SourceAddress] |
174 | je @f |
174 | je @f |
175 | test eax, eax |
175 | test eax, eax |
176 | jnz .socket_loop |
176 | jnz .socket_loop |
177 | @@: |
177 | @@: |
178 | 178 | ||
179 | mov ax, [ebx + TCP_SOCKET.RemotePort] |
179 | mov ax, [ebx + TCP_SOCKET.RemotePort] |
180 | cmp [edx + TCP_header.SourcePort], ax |
180 | cmp [edx + TCP_header.SourcePort], ax |
181 | je .found_socket |
181 | je .found_socket |
182 | test ax, ax |
182 | test ax, ax |
183 | jnz .socket_loop |
183 | jnz .socket_loop |
184 | .found_socket: ; ebx now contains the socketpointer |
184 | .found_socket: ; ebx now contains the socketpointer |
185 | pusha |
185 | pusha |
186 | mov ecx, socket_mutex |
186 | mov ecx, socket_mutex |
187 | call mutex_unlock |
187 | call mutex_unlock |
188 | popa |
188 | popa |
189 | 189 | ||
190 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: socket ptr=%x state=%u flags=%x\n", ebx, [ebx + TCP_SOCKET.t_state], [edx + TCP_header.Flags]:2 |
190 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: socket ptr=%x state=%u flags=%x\n", ebx, [ebx + TCP_SOCKET.t_state], [edx + TCP_header.Flags]:2 |
191 | 191 | ||
192 | ;---------------------------- |
192 | ;---------------------------- |
193 | ; Check if socket isnt closed |
193 | ; Check if socket isnt closed |
194 | 194 | ||
195 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
195 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
196 | je .drop_no_socket |
196 | je .drop_no_socket |
197 | 197 | ||
198 | ;---------------- |
198 | ;---------------- |
199 | ; Lock the socket |
199 | ; Lock the socket |
200 | 200 | ||
201 | pusha |
201 | pusha |
202 | lea ecx, [ebx + SOCKET.mutex] |
202 | lea ecx, [ebx + SOCKET.mutex] |
203 | call mutex_lock |
203 | call mutex_lock |
204 | popa |
204 | popa |
205 | 205 | ||
206 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: socket locked\n" |
206 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: socket locked\n" |
207 | 207 | ||
208 | ;--------------------------- |
208 | ;--------------------------- |
209 | ; disable all temporary bits |
209 | ; disable all temporary bits |
210 | 210 | ||
211 | mov [temp_bits], 0 |
211 | mov [temp_bits], 0 |
212 | 212 | ||
213 | ;--------------------------------------- |
213 | ;--------------------------------------- |
214 | ; unscale the window into a 32 bit value |
214 | ; unscale the window into a 32 bit value |
215 | 215 | ||
216 | movzx eax, [edx + TCP_header.Window] |
216 | movzx eax, [edx + TCP_header.Window] |
217 | push ecx |
217 | push ecx |
218 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
218 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
219 | shl eax, cl |
219 | shl eax, cl |
220 | mov dword [edx + TCP_header.Window], eax ; word after window is checksum, we dont need checksum anymore |
220 | mov dword [edx + TCP_header.Window], eax ; word after window is checksum, we dont need checksum anymore |
221 | pop ecx |
221 | pop ecx |
222 | 222 | ||
223 | ;--------------------------------------- |
223 | ;--------------------------------------- |
224 | ; Are we accepting incoming connections? |
224 | ; Are we accepting incoming connections? |
225 | 225 | ||
226 | test [ebx + SOCKET.options], SO_ACCEPTCON |
226 | test [ebx + SOCKET.options], SO_ACCEPTCON |
227 | jz .no_accept |
227 | jz .no_accept |
228 | 228 | ||
229 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Accepting new connection\n" |
229 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Accepting new connection\n" |
230 | 230 | ||
231 | pusha |
231 | pusha |
232 | lea ecx, [ebx + SOCKET.mutex] |
232 | lea ecx, [ebx + SOCKET.mutex] |
233 | call mutex_unlock |
233 | call mutex_unlock |
234 | popa |
234 | popa |
235 | 235 | ||
236 | push ecx edx esi edi ;;; |
236 | push ecx edx esi edi |
237 | call SOCKET_fork |
237 | call SOCKET_fork |
238 | pop edi esi edx ecx |
238 | pop edi esi edx ecx |
239 | 239 | ||
240 | test eax, eax |
240 | test eax, eax |
241 | jz .drop_no_socket |
241 | jz .drop_no_socket |
242 | 242 | ||
243 | mov ebx, eax |
243 | mov ebx, eax |
244 | 244 | ||
245 | mov [temp_bits], TCP_BIT_DROPSOCKET |
245 | mov [temp_bits], TCP_BIT_DROPSOCKET |
246 | 246 | ||
247 | push dword [edi + 4] ; Ipv4 destination addres |
247 | push [edi + IPv4_header.DestinationAddress] |
248 | pop [ebx + IP_SOCKET.LocalIP] |
248 | pop [ebx + IP_SOCKET.LocalIP] |
249 | 249 | ||
250 | push [edx + TCP_header.DestinationPort] |
250 | push [edx + TCP_header.DestinationPort] |
251 | pop [ebx + TCP_SOCKET.LocalPort] |
251 | pop [ebx + TCP_SOCKET.LocalPort] |
252 | 252 | ||
253 | mov [ebx + TCP_SOCKET.t_state], TCPS_LISTEN |
253 | mov [ebx + TCP_SOCKET.t_state], TCPS_LISTEN |
254 | .no_accept: |
254 | .no_accept: |
255 | 255 | ||
256 | 256 | ||
257 | ;------------------------------------- |
257 | ;------------------------------------- |
258 | ; Reset idle timer and keepalive timer |
258 | ; Reset idle timer and keepalive timer |
259 | 259 | ||
260 | mov [ebx + TCP_SOCKET.t_idle], 0 |
260 | mov [ebx + TCP_SOCKET.t_idle], 0 |
261 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_idle |
261 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_idle |
262 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_keepalive |
262 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_keepalive |
263 | 263 | ||
264 | ;-------------------- |
264 | ;-------------------- |
265 | ; Process TCP options |
265 | ; Process TCP options |
266 | 266 | ||
267 | ;;; FIXME: for LISTEN, options should be called after we determined route, we need it for MSS |
267 | ;;; FIXME: for LISTEN, options should be called after we determined route, we need it for MSS |
268 | ;;; cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN ; no options when in listen state |
268 | ;;; cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN ; no options when in listen state |
269 | ;;; jz .not_uni_xfer ; also no header prediction |
269 | ;;; jz .not_uni_xfer ; also no header prediction |
270 | 270 | ||
271 | push ecx |
271 | push ecx |
272 | 272 | ||
273 | mov ecx, [dataoffset] |
273 | mov ecx, [dataoffset] |
274 | cmp ecx, sizeof.TCP_header ; Does header contain any options? |
274 | cmp ecx, sizeof.TCP_header ; Does header contain any options? |
275 | je .no_options |
275 | je .no_options |
276 | 276 | ||
277 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Segment has options\n" |
277 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Segment has options\n" |
278 | 278 | ||
279 | add ecx, edx |
279 | add ecx, edx |
280 | lea esi, [edx + sizeof.TCP_header] |
280 | lea esi, [edx + sizeof.TCP_header] |
281 | 281 | ||
282 | .opt_loop: |
282 | .opt_loop: |
283 | cmp esi, ecx ; are we scanning outside of header? |
283 | cmp esi, ecx ; are we scanning outside of header? |
284 | jae .no_options |
284 | jae .no_options |
285 | lodsb |
285 | lodsb |
286 | cmp al, TCP_OPT_EOL ; end of option list? |
286 | cmp al, TCP_OPT_EOL ; end of option list? |
287 | je .no_options |
287 | je .no_options |
288 | cmp al, TCP_OPT_NOP |
288 | cmp al, TCP_OPT_NOP |
289 | je .opt_loop |
289 | je .opt_loop |
290 | cmp al, TCP_OPT_MAXSEG |
290 | cmp al, TCP_OPT_MAXSEG |
291 | je .opt_maxseg |
291 | je .opt_maxseg |
292 | cmp al, TCP_OPT_WINDOW |
292 | cmp al, TCP_OPT_WINDOW |
293 | je .opt_window |
293 | je .opt_window |
294 | cmp al, TCP_OPT_SACK_PERMIT |
294 | cmp al, TCP_OPT_SACK_PERMIT |
295 | je .opt_sack_permit |
295 | je .opt_sack_permit |
296 | ; cmp al, TCP_OPT_SACK |
296 | ; cmp al, TCP_OPT_SACK |
297 | ; je .opt_sack |
297 | ; je .opt_sack |
298 | cmp al, TCP_OPT_TIMESTAMP |
298 | cmp al, TCP_OPT_TIMESTAMP |
299 | je .opt_timestamp |
299 | je .opt_timestamp |
300 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: unknown option:%u\n", al |
300 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: unknown option:%u\n", al |
301 | jmp .no_options ; If we reach here, some unknown options were received, skip them all! |
301 | jmp .no_options ; If we reach here, some unknown options were received, skip them all! |
302 | 302 | ||
303 | .opt_maxseg: |
303 | .opt_maxseg: |
304 | lodsb |
304 | lodsb |
305 | cmp al, 4 |
305 | cmp al, 4 |
306 | jne .no_options ; error occured, ignore all options! |
306 | jne .no_options ; error occured, ignore all options! |
307 | 307 | ||
308 | test [edx + TCP_header.Flags], TH_SYN |
308 | test [edx + TCP_header.Flags], TH_SYN |
309 | jz @f |
309 | jz @f |
310 | 310 | ||
311 | xor eax, eax |
311 | xor eax, eax |
312 | lodsw |
312 | lodsw |
313 | rol ax, 8 |
313 | rol ax, 8 |
314 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Maxseg=%u\n", eax |
314 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Maxseg=%u\n", eax |
315 | call TCP_mss |
315 | call TCP_mss |
316 | @@: |
316 | @@: |
317 | jmp .opt_loop |
317 | jmp .opt_loop |
318 | 318 | ||
319 | 319 | ||
320 | .opt_window: |
320 | .opt_window: |
321 | lodsb |
321 | lodsb |
322 | cmp al, 3 |
322 | cmp al, 3 |
323 | jne .no_options |
323 | jne .no_options |
324 | 324 | ||
325 | test [edx + TCP_header.Flags], TH_SYN |
325 | test [edx + TCP_header.Flags], TH_SYN |
326 | jz @f |
326 | jz @f |
327 | 327 | ||
328 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Got window scale option\n" |
328 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Got window scale option\n" |
329 | or [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
329 | or [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
330 | 330 | ||
331 | lodsb |
331 | lodsb |
332 | mov [ebx + TCP_SOCKET.SND_SCALE], al |
332 | mov [ebx + TCP_SOCKET.SND_SCALE], al |
333 | ;;;;; TODO |
333 | ;;;;; TODO |
334 | 334 | ||
335 | @@: |
335 | @@: |
336 | jmp .opt_loop |
336 | jmp .opt_loop |
337 | 337 | ||
338 | 338 | ||
339 | .opt_sack_permit: |
339 | .opt_sack_permit: |
340 | lodsb |
340 | lodsb |
341 | cmp al, 2 |
341 | cmp al, 2 |
342 | jne .no_options |
342 | jne .no_options |
343 | 343 | ||
344 | test [edx + TCP_header.Flags], TH_SYN |
344 | test [edx + TCP_header.Flags], TH_SYN |
345 | jz @f |
345 | jz @f |
346 | 346 | ||
347 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Selective Acknowledgement permitted\n" |
347 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Selective Acknowledgement permitted\n" |
348 | or [ebx + TCP_SOCKET.t_flags], TF_SACK_PERMIT |
348 | or [ebx + TCP_SOCKET.t_flags], TF_SACK_PERMIT |
349 | 349 | ||
350 | @@: |
350 | @@: |
351 | jmp .opt_loop |
351 | jmp .opt_loop |
352 | 352 | ||
353 | 353 | ||
354 | .opt_timestamp: |
354 | .opt_timestamp: |
355 | lodsb |
355 | lodsb |
356 | cmp al, 10 ; length must be 10 |
356 | cmp al, 10 ; length must be 10 |
357 | jne .no_options |
357 | jne .no_options |
358 | 358 | ||
359 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Got timestamp option\n" |
359 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Got timestamp option\n" |
360 | 360 | ||
361 | test [edx + TCP_header.Flags], TH_SYN |
361 | test [edx + TCP_header.Flags], TH_SYN |
362 | jz @f |
362 | jz @f |
363 | or [ebx + TCP_SOCKET.t_flags], TF_RCVD_TSTMP |
363 | or [ebx + TCP_SOCKET.t_flags], TF_RCVD_TSTMP |
364 | @@: |
364 | @@: |
365 | 365 | ||
366 | lodsd |
366 | lodsd |
367 | bswap eax |
367 | bswap eax |
368 | mov [ebx + TCP_SOCKET.ts_val], eax |
368 | mov [ebx + TCP_SOCKET.ts_val], eax |
369 | lodsd ; timestamp echo reply |
369 | lodsd ; timestamp echo reply |
370 | mov [ebx + TCP_SOCKET.ts_ecr], eax |
370 | mov [ebx + TCP_SOCKET.ts_ecr], eax |
371 | or [temp_bits], TCP_BIT_TIMESTAMP |
371 | or [temp_bits], TCP_BIT_TIMESTAMP |
372 | 372 | ||
373 | ; Since we have a timestamp, lets do the paws test right away! |
373 | ; Since we have a timestamp, lets do the paws test right away! |
374 | 374 | ||
375 | test [edx + TCP_header.Flags], TH_RST |
375 | test [edx + TCP_header.Flags], TH_RST |
376 | jnz .no_paws |
376 | jnz .no_paws |
377 | 377 | ||
378 | mov eax, [ebx + TCP_SOCKET.ts_recent] |
378 | mov eax, [ebx + TCP_SOCKET.ts_recent] |
379 | test eax, eax |
379 | test eax, eax |
380 | jz .no_paws |
380 | jz .no_paws |
381 | cmp eax, [ebx + TCP_SOCKET.ts_val] |
381 | cmp eax, [ebx + TCP_SOCKET.ts_val] |
382 | jbe .no_paws |
382 | jbe .no_paws |
383 | 383 | ||
384 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: PAWS: detected an old segment\n" |
384 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: PAWS: detected an old segment\n" |
385 | 385 | ||
386 | mov eax, [timestamp] |
386 | mov eax, [timestamp] |
387 | sub eax, [ebx + TCP_SOCKET.ts_recent_age] |
387 | sub eax, [ebx + TCP_SOCKET.ts_recent_age] |
388 | 388 | ||
389 | pop ecx |
389 | pop ecx |
390 | cmp eax, TCP_PAWS_IDLE |
390 | cmp eax, TCP_PAWS_IDLE |
391 | jle .paws_drop |
391 | jle .paws_drop |
392 | push ecx |
392 | push ecx |
393 | mov [ebx + TCP_SOCKET.ts_recent], 0 ; timestamp was invalid, fix it. |
393 | mov [ebx + TCP_SOCKET.ts_recent], 0 ; timestamp was invalid, fix it. |
394 | .no_paws: |
394 | .no_paws: |
395 | jmp .opt_loop |
395 | jmp .opt_loop |
396 | 396 | ||
397 | .paws_drop: |
397 | .paws_drop: |
398 | inc [TCPS_rcvduppack] ; update stats |
398 | inc [TCPS_rcvduppack] ; update stats |
399 | add [TCPS_rcvdupbyte], ecx |
399 | add [TCPS_rcvdupbyte], ecx |
400 | inc [TCPS_pawsdrop] |
400 | inc [TCPS_pawsdrop] |
401 | jmp .drop_after_ack |
401 | jmp .drop_after_ack |
402 | 402 | ||
403 | .no_options: |
403 | .no_options: |
404 | 404 | ||
405 | pop ecx |
405 | pop ecx |
406 | 406 | ||
407 | ;----------------------------------------------------------------------- |
407 | ;----------------------------------------------------------------------- |
408 | ; Time to do some header prediction (Original Principle by Van Jacobson) |
408 | ; Time to do some header prediction (Original Principle by Van Jacobson) |
409 | 409 | ||
410 | ; There are two common cases for an uni-directional data transfer. |
410 | ; There are two common cases for an uni-directional data transfer. |
411 | ; |
411 | ; |
412 | ; General rule: the packets has no control flags, is in-sequence, |
412 | ; General rule: the packets has no control flags, is in-sequence, |
413 | ; window width didnt change and we're not retransmitting. |
413 | ; window width didnt change and we're not retransmitting. |
414 | ; |
414 | ; |
415 | ; Second rules: |
415 | ; Second rules: |
416 | ; - If the length is 0 and the ACK moved forward, we're the sender side of the transfer. |
416 | ; - If the length is 0 and the ACK moved forward, we're the sender side of the transfer. |
417 | ; In this case we'll free the ACK'ed data and notify higher levels that we have free space in buffer |
417 | ; In this case we'll free the ACK'ed data and notify higher levels that we have free space in buffer |
418 | ; |
418 | ; |
419 | ; - If the length is not 0 and the ACK didn't move, we're the receiver side of the transfer. |
419 | ; - If the length is not 0 and the ACK didn't move, we're the receiver side of the transfer. |
420 | ; If the packets are in order (data queue is empty), add the data to the socket buffer and request a delayed ACK |
420 | ; If the packets are in order (data queue is empty), add the data to the socket buffer and request a delayed ACK |
421 | 421 | ||
422 | cmp [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
422 | cmp [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
423 | jnz .not_uni_xfer |
423 | jnz .not_uni_xfer |
424 | 424 | ||
425 | test [edx + TCP_header.Flags], TH_SYN + TH_FIN + TH_RST + TH_URG |
425 | test [edx + TCP_header.Flags], TH_SYN + TH_FIN + TH_RST + TH_URG |
426 | jnz .not_uni_xfer |
426 | jnz .not_uni_xfer |
427 | 427 | ||
428 | test [edx + TCP_header.Flags], TH_ACK |
428 | test [edx + TCP_header.Flags], TH_ACK |
429 | jz .not_uni_xfer |
429 | jz .not_uni_xfer |
430 | 430 | ||
431 | mov eax, [edx + TCP_header.SequenceNumber] |
431 | mov eax, [edx + TCP_header.SequenceNumber] |
432 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
432 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
433 | jne .not_uni_xfer |
433 | jne .not_uni_xfer |
434 | 434 | ||
435 | mov eax, dword [edx + TCP_header.Window] |
435 | mov eax, dword [edx + TCP_header.Window] |
436 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
436 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
437 | jne .not_uni_xfer |
437 | jne .not_uni_xfer |
438 | 438 | ||
439 | mov eax, [ebx + TCP_SOCKET.SND_NXT] |
439 | mov eax, [ebx + TCP_SOCKET.SND_NXT] |
440 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
440 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
441 | jne .not_uni_xfer |
441 | jne .not_uni_xfer |
442 | 442 | ||
443 | ;--------------------------------------- |
443 | ;--------------------------------------- |
444 | ; check if we are sender in the uni-xfer |
444 | ; check if we are sender in the uni-xfer |
445 | 445 | ||
446 | ; If the following 4 conditions are all true, this segment is a pure ACK. |
446 | ; If the following 4 conditions are all true, this segment is a pure ACK. |
447 | ; |
447 | ; |
448 | ; - The segment contains no data. |
448 | ; - The segment contains no data. |
449 | test ecx, ecx |
449 | test ecx, ecx |
450 | jnz .not_sender |
450 | jnz .not_sender |
451 | 451 | ||
452 | ; - The congestion window is greater than or equal to the current send window. |
452 | ; - The congestion window is greater than or equal to the current send window. |
453 | ; 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. |
453 | ; 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. |
454 | mov eax, [ebx + TCP_SOCKET.SND_CWND] |
454 | mov eax, [ebx + TCP_SOCKET.SND_CWND] |
455 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
455 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
456 | jb .not_uni_xfer |
456 | jb .not_uni_xfer |
457 | 457 | ||
458 | ; - The acknowledgment field in the segment is less than or equal to the maximum sequence number sent. |
458 | ; - The acknowledgment field in the segment is less than or equal to the maximum sequence number sent. |
459 | mov eax, [edx + TCP_header.AckNumber] |
459 | mov eax, [edx + TCP_header.AckNumber] |
460 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
460 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
461 | ja .not_uni_xfer |
461 | ja .not_uni_xfer |
462 | 462 | ||
463 | ; - The acknowledgment field in the segment is greater than the largest unacknowledged sequence number. |
463 | ; - The acknowledgment field in the segment is greater than the largest unacknowledged sequence number. |
464 | sub eax, [ebx + TCP_SOCKET.SND_UNA] |
464 | sub eax, [ebx + TCP_SOCKET.SND_UNA] |
465 | jbe .not_uni_xfer |
465 | jbe .not_uni_xfer |
466 | 466 | ||
467 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Header prediction: we are sender\n" |
467 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Header prediction: we are sender\n" |
468 | 468 | ||
469 | ;--------------------------------- |
469 | ;--------------------------------- |
470 | ; Packet is a pure ACK, process it |
470 | ; Packet is a pure ACK, process it |
471 | 471 | ||
472 | ; Delete acknowledged bytes from send buffer |
472 | ; Delete acknowledged bytes from send buffer |
473 | pusha |
473 | pusha |
474 | mov ecx, eax |
474 | mov ecx, eax |
475 | lea eax, [ebx + STREAM_SOCKET.snd] |
475 | lea eax, [ebx + STREAM_SOCKET.snd] |
476 | call SOCKET_ring_free |
476 | call SOCKET_ring_free |
477 | popa |
477 | popa |
478 | 478 | ||
479 | ; Update RTT estimators |
479 | ; Update RTT estimators |
480 | 480 | ||
481 | test [temp_bits], TCP_BIT_TIMESTAMP |
481 | test [temp_bits], TCP_BIT_TIMESTAMP |
482 | jz .no_timestamp_rtt |
482 | jz .no_timestamp_rtt |
483 | mov eax, [timestamp] |
483 | mov eax, [timestamp] |
484 | sub eax, [ebx + TCP_SOCKET.ts_ecr] |
484 | sub eax, [ebx + TCP_SOCKET.ts_ecr] |
485 | inc eax |
485 | inc eax |
486 | call TCP_xmit_timer |
486 | call TCP_xmit_timer |
487 | jmp .rtt_done |
487 | jmp .rtt_done |
488 | - | ||
489 | .no_timestamp_rtt: |
488 | .no_timestamp_rtt: |
- | 489 | ||
490 | cmp [ebx + TCP_SOCKET.t_rtt], 0 |
490 | cmp [ebx + TCP_SOCKET.t_rtt], 0 |
491 | je .rtt_done |
491 | je .rtt_done |
492 | mov eax, [edx + TCP_header.AckNumber] |
492 | mov eax, [edx + TCP_header.AckNumber] |
493 | cmp eax, [ebx + TCP_SOCKET.t_rtseq] |
493 | cmp eax, [ebx + TCP_SOCKET.t_rtseq] |
494 | jbe .rtt_done |
494 | jbe .rtt_done |
495 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
495 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
496 | call TCP_xmit_timer |
496 | call TCP_xmit_timer |
497 | - | ||
498 | .rtt_done: |
497 | .rtt_done: |
499 | 498 | ||
500 | ; update window pointers |
499 | ; update window pointers |
501 | mov eax, [edx + TCP_header.AckNumber] |
500 | mov eax, [edx + TCP_header.AckNumber] |
502 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
501 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
503 | 502 | ||
504 | ; Stop retransmit timer |
503 | ; Stop retransmit timer |
505 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission |
504 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission |
506 | 505 | ||
507 | ; Unlock the socket |
506 | ; Unlock the socket |
508 | pusha |
507 | pusha |
509 | lea ecx, [ebx + SOCKET.mutex] |
508 | lea ecx, [ebx + SOCKET.mutex] |
510 | call mutex_unlock |
509 | call mutex_unlock |
511 | popa |
510 | popa |
512 | 511 | ||
513 | ; Awaken waiting processes |
512 | ; Awaken waiting processes |
514 | mov eax, ebx |
513 | mov eax, ebx |
515 | call SOCKET_notify |
514 | call SOCKET_notify |
516 | 515 | ||
517 | ; Generate more output |
516 | ; Generate more output |
518 | call TCP_output |
517 | call TCP_output |
519 | 518 | ||
520 | jmp .drop_no_socket |
519 | jmp .drop_no_socket |
521 | 520 | ||
522 | ;------------------------------------------------- |
521 | ;------------------------------------------------- |
523 | ; maybe we are the receiver in the uni-xfer then.. |
522 | ; maybe we are the receiver in the uni-xfer then.. |
524 | 523 | ||
525 | .not_sender: |
524 | .not_sender: |
526 | ; - The amount of data in the segment is greater than 0 (data count is in ecx) |
525 | ; - The amount of data in the segment is greater than 0 (data count is in ecx) |
527 | 526 | ||
528 | ; - The acknowledgment field equals the largest unacknowledged sequence number. This means no data is acknowledged by this segment. |
527 | ; - The acknowledgment field equals the largest unacknowledged sequence number. This means no data is acknowledged by this segment. |
529 | mov eax, [edx + TCP_header.AckNumber] |
528 | mov eax, [edx + TCP_header.AckNumber] |
530 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
529 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
531 | jne .not_uni_xfer |
530 | jne .not_uni_xfer |
532 | 531 | ||
533 | ; - The reassembly list of out-of-order segments for the connection is empty. |
532 | ; - The reassembly list of out-of-order segments for the connection is empty. |
534 | cmp [ebx + TCP_SOCKET.seg_next], 0 |
533 | cmp [ebx + TCP_SOCKET.seg_next], 0 |
535 | jne .not_uni_xfer |
534 | jne .not_uni_xfer |
536 | 535 | ||
537 | ; Complete processing of received data |
536 | ; Complete processing of received data |
538 | 537 | ||
539 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Header prediction: we are receiving %u bytes\n", ecx |
538 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Header prediction: we are receiving %u bytes\n", ecx |
540 | 539 | ||
541 | mov esi, [dataoffset] |
540 | mov esi, [dataoffset] |
542 | add esi, edx |
541 | add esi, edx |
543 | lea eax, [ebx + STREAM_SOCKET.rcv] |
542 | lea eax, [ebx + STREAM_SOCKET.rcv] |
544 | call SOCKET_ring_write ; Add the data to the socket buffer |
543 | call SOCKET_ring_write ; Add the data to the socket buffer |
545 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
544 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
546 | 545 | ||
547 | mov eax, ebx |
546 | mov eax, ebx |
548 | call SOCKET_notify |
547 | call SOCKET_notify |
549 | 548 | ||
550 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK ; Set delayed ack flag |
549 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK ; Set delayed ack flag |
551 | 550 | ||
552 | jmp .drop |
551 | jmp .drop |
553 | 552 | ||
554 | ;-------------------------------------------------- |
553 | ;-------------------------------------------------- |
555 | ; Header prediction failed, do it the slow way |
554 | ; Header prediction failed, do it the slow way |
556 | 555 | ||
557 | .not_uni_xfer: |
556 | .not_uni_xfer: |
558 | 557 | ||
559 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Header prediction failed\n" |
558 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Header prediction failed\n" |
560 | 559 | ||
561 | ; Calculate receive window size |
560 | ; Calculate receive window size |
562 | push edx |
561 | push edx |
563 | mov eax, SOCKET_MAXDATA |
562 | mov eax, SOCKET_MAXDATA |
564 | sub eax, [ebx + STREAM_SOCKET.rcv.size] |
563 | sub eax, [ebx + STREAM_SOCKET.rcv.size] |
565 | DEBUGF DEBUG_NETWORK_VERBOSE, "Space in receive buffer=%d\n", eax |
564 | DEBUGF DEBUG_NETWORK_VERBOSE, "Space in receive buffer=%d\n", eax |
566 | mov edx, [ebx + TCP_SOCKET.RCV_ADV] |
565 | mov edx, [ebx + TCP_SOCKET.RCV_ADV] |
567 | sub edx, [ebx + TCP_SOCKET.RCV_NXT] |
566 | sub edx, [ebx + TCP_SOCKET.RCV_NXT] |
568 | DEBUGF DEBUG_NETWORK_VERBOSE, "Current advertised window=%d\n", edx |
567 | DEBUGF DEBUG_NETWORK_VERBOSE, "Current advertised window=%d\n", edx |
569 | cmp eax, edx |
568 | cmp eax, edx |
570 | jg @f |
569 | jg @f |
571 | mov eax, edx |
570 | mov eax, edx |
572 | @@: |
571 | @@: |
573 | DEBUGF DEBUG_NETWORK_VERBOSE, "Receive window size=%d\n", eax |
572 | DEBUGF DEBUG_NETWORK_VERBOSE, "Receive window size=%d\n", eax |
574 | mov [ebx + TCP_SOCKET.RCV_WND], eax |
573 | mov [ebx + TCP_SOCKET.RCV_WND], eax |
575 | pop edx |
574 | pop edx |
576 | 575 | ||
577 | ; If we are in listen or syn_sent state, go to that specific code right away |
576 | ; If we are in listen or syn_sent state, go to that specific code right away |
578 | 577 | ||
579 | cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN |
578 | cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN |
580 | je .LISTEN |
579 | je .LISTEN |
581 | 580 | ||
582 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_SENT |
581 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_SENT |
583 | je .SYN_SENT |
582 | je .SYN_SENT |
584 | 583 | ||
585 | ;---------------------------- |
584 | ;---------------------------- |
586 | ; trim any data not in window |
585 | ; trim any data not in window |
587 | 586 | ||
588 | ; 1. Check for duplicate data at beginning of segment |
587 | ; 1. Check for duplicate data at beginning of segment |
589 | 588 | ||
590 | ; Calculate number of bytes we need to drop |
589 | ; Calculate number of bytes we need to drop |
591 | mov eax, [ebx + TCP_SOCKET.RCV_NXT] |
590 | mov eax, [ebx + TCP_SOCKET.RCV_NXT] |
592 | sub eax, [edx + TCP_header.SequenceNumber] |
591 | sub eax, [edx + TCP_header.SequenceNumber] |
593 | jle .no_duplicate |
592 | jle .no_duplicate |
594 | 593 | ||
595 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: %u bytes duplicate data!\n", eax |
594 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: %u bytes duplicate data!\n", eax |
596 | 595 | ||
597 | test [edx + TCP_header.Flags], TH_SYN |
596 | test [edx + TCP_header.Flags], TH_SYN |
598 | jz .no_dup_syn |
597 | jz .no_dup_syn |
599 | 598 | ||
600 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: got duplicate syn\n" |
599 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: got duplicate syn\n" |
601 | 600 | ||
602 | and [edx + TCP_header.Flags], not (TH_SYN) |
601 | and [edx + TCP_header.Flags], not (TH_SYN) |
603 | inc [edx + TCP_header.SequenceNumber] |
602 | inc [edx + TCP_header.SequenceNumber] |
604 | 603 | ||
605 | cmp [edx + TCP_header.UrgentPointer], 1 |
604 | cmp [edx + TCP_header.UrgentPointer], 1 |
606 | jbe @f |
605 | jbe @f |
607 | dec [edx + TCP_header.UrgentPointer] |
606 | dec [edx + TCP_header.UrgentPointer] |
608 | jmp .dup_syn |
607 | jmp .dup_syn |
609 | @@: |
608 | @@: |
610 | and [edx + TCP_header.Flags], not (TH_URG) |
609 | and [edx + TCP_header.Flags], not (TH_URG) |
611 | .dup_syn: |
610 | .dup_syn: |
612 | dec eax |
611 | dec eax |
613 | .no_dup_syn: |
612 | .no_dup_syn: |
614 | 613 | ||
615 | ; 2. Check for entire duplicate segment |
614 | ; 2. Check for entire duplicate segment |
616 | cmp eax, ecx ; eax holds number of bytes to drop, ecx is data size |
615 | cmp eax, ecx ; eax holds number of bytes to drop, ecx is data size |
617 | jb .duplicate |
616 | jb .duplicate |
618 | jnz @f |
617 | jnz @f |
619 | test [edx + TCP_header.Flags], TH_FIN |
618 | test [edx + TCP_header.Flags], TH_FIN |
620 | jnz .duplicate |
619 | jnz .duplicate |
621 | @@: |
620 | @@: |
622 | 621 | ||
623 | ; Any valid FIN must be to the left of the window. |
622 | ; Any valid FIN must be to the left of the window. |
624 | ; At this point the FIN must be out of sequence or a duplicate, drop it |
623 | ; At this point the FIN must be out of sequence or a duplicate, drop it |
625 | and [edx + TCP_header.Flags], not TH_FIN |
624 | and [edx + TCP_header.Flags], not TH_FIN |
626 | 625 | ||
627 | ; send an ACK and resynchronize and drop any data. |
626 | ; send an ACK and resynchronize and drop any data. |
628 | ; But keep on processing for RST or ACK |
627 | ; But keep on processing for RST or ACK |
629 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
628 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
630 | mov eax, ecx |
629 | mov eax, ecx |
631 | 630 | ||
632 | inc [TCPS_rcvpartduppack] |
631 | inc [TCPS_rcvpartduppack] |
633 | 632 | ||
634 | ;;; TODO: update stats |
633 | ;;; TODO: update stats |
635 | 634 | ||
636 | ;----------------------------------------------- |
635 | ;----------------------------------------------- |
637 | ; Remove duplicate data and update urgent offset |
636 | ; Remove duplicate data and update urgent offset |
638 | 637 | ||
639 | .duplicate: |
638 | .duplicate: |
640 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: trimming duplicate data\n" |
639 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: trimming duplicate data\n" |
641 | 640 | ||
642 | ; Trim data from left side of window |
641 | ; Trim data from left side of window |
643 | add [dataoffset], eax |
642 | add [dataoffset], eax |
644 | add [edx + TCP_header.SequenceNumber], eax |
643 | add [edx + TCP_header.SequenceNumber], eax |
645 | sub ecx, eax |
644 | sub ecx, eax |
646 | 645 | ||
647 | sub [edx + TCP_header.UrgentPointer], ax |
646 | sub [edx + TCP_header.UrgentPointer], ax |
648 | jg @f |
647 | jg @f |
649 | and [edx + TCP_header.Flags], not (TH_URG) |
648 | and [edx + TCP_header.Flags], not (TH_URG) |
650 | mov [edx + TCP_header.UrgentPointer], 0 |
649 | mov [edx + TCP_header.UrgentPointer], 0 |
651 | @@: |
650 | @@: |
652 | 651 | ||
653 | ;-------------------------------------------------- |
652 | ;-------------------------------------------------- |
654 | ; Handle data that arrives after process terminates |
653 | ; Handle data that arrives after process terminates |
655 | 654 | ||
656 | .no_duplicate: |
655 | .no_duplicate: |
657 | cmp [ebx + SOCKET.PID], 0 ;;; TODO: use socket flags instead?? |
656 | cmp [ebx + SOCKET.PID], 0 ;;; TODO: use socket flags instead?? |
658 | jne .not_terminated |
657 | jne .not_terminated |
659 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
658 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
660 | jbe .not_terminated |
659 | jbe .not_terminated |
661 | test ecx, ecx |
660 | test ecx, ecx |
662 | jz .not_terminated |
661 | jz .not_terminated |
663 | 662 | ||
664 | mov eax, ebx |
663 | mov eax, ebx |
665 | call TCP_close |
664 | call TCP_close |
666 | inc [TCPS_rcvafterclose] |
665 | inc [TCPS_rcvafterclose] |
667 | jmp .respond_seg_reset |
666 | jmp .respond_seg_reset |
668 | 667 | ||
669 | ;---------------------------------------- |
668 | ;---------------------------------------- |
670 | ; Remove data beyond right edge of window |
669 | ; Remove data beyond right edge of window |
671 | 670 | ||
672 | .not_terminated: |
671 | .not_terminated: |
673 | mov eax, [edx + TCP_header.SequenceNumber] |
672 | mov eax, [edx + TCP_header.SequenceNumber] |
674 | add eax, ecx |
673 | add eax, ecx |
675 | sub eax, [ebx + TCP_SOCKET.RCV_NXT] |
674 | sub eax, [ebx + TCP_SOCKET.RCV_NXT] |
676 | sub eax, [ebx + TCP_SOCKET.RCV_WND] ; eax now holds the number of bytes to drop |
675 | sub eax, [ebx + TCP_SOCKET.RCV_WND] ; eax now holds the number of bytes to drop |
677 | jle .no_excess_data |
676 | jle .no_excess_data |
678 | 677 | ||
679 | DEBUGF DEBUG_NETWORK_VERBOSE, "%d bytes beyond right edge of window\n", eax |
678 | DEBUGF DEBUG_NETWORK_VERBOSE, "%d bytes beyond right edge of window\n", eax |
680 | 679 | ||
681 | ;;; TODO: update stats |
680 | ;;; TODO: update stats |
682 | cmp eax, ecx |
681 | cmp eax, ecx |
683 | jl .dont_drop_all |
682 | jl .dont_drop_all |
684 | ; If a new connection request is received while in TIME_WAIT, drop the old connection and start over, |
683 | ; If a new connection request is received while in TIME_WAIT, drop the old connection and start over, |
685 | ; if the sequence numbers are above the previous ones |
684 | ; if the sequence numbers are above the previous ones |
686 | 685 | ||
687 | test [edx + TCP_header.Flags], TH_SYN |
686 | test [edx + TCP_header.Flags], TH_SYN |
688 | jz .no_new_request |
687 | jz .no_new_request |
689 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
688 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
690 | jne .no_new_request |
689 | jne .no_new_request |
691 | ; mov edx, [ebx + TCP_SOCKET.RCV_NXT] |
690 | ; mov edx, [ebx + TCP_SOCKET.RCV_NXT] |
692 | ; cmp edx, [edx + TCP_header.SequenceNumber] |
691 | ; cmp edx, [edx + TCP_header.SequenceNumber] |
693 | ; add edx, 64000 ; TCP_ISSINCR FIXME |
692 | ; add edx, 64000 ; TCP_ISSINCR FIXME |
694 | mov eax, ebx |
693 | mov eax, ebx |
695 | call TCP_close |
694 | call TCP_close |
696 | jmp .findpcb ; FIXME: skip code for unscaling window, ... |
695 | jmp .findpcb ; FIXME: skip code for unscaling window, ... |
697 | .no_new_request: |
696 | .no_new_request: |
698 | 697 | ||
699 | ; If window is closed, we can only take segments at window edge, and have to drop data and PUSH from |
698 | ; If window is closed, we can only take segments at window edge, and have to drop data and PUSH from |
700 | ; incoming segments. Continue processing, but remember to ACK. Otherwise drop segment and ACK |
699 | ; incoming segments. Continue processing, but remember to ACK. Otherwise drop segment and ACK |
701 | 700 | ||
702 | cmp [ebx + TCP_SOCKET.RCV_WND], 0 |
701 | cmp [ebx + TCP_SOCKET.RCV_WND], 0 |
703 | jne .drop_after_ack |
702 | jne .drop_after_ack |
704 | mov esi, [edx + TCP_header.SequenceNumber] |
703 | mov esi, [edx + TCP_header.SequenceNumber] |
705 | cmp esi, [ebx + TCP_SOCKET.RCV_NXT] |
704 | cmp esi, [ebx + TCP_SOCKET.RCV_NXT] |
706 | jne .drop_after_ack |
705 | jne .drop_after_ack |
707 | 706 | ||
708 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
707 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
709 | ;;; TODO: update stats |
708 | ;;; TODO: update stats |
710 | .dont_drop_all: |
709 | .dont_drop_all: |
711 | ;;; TODO: update stats |
710 | ;;; TODO: update stats |
712 | DEBUGF DEBUG_NETWORK_VERBOSE, "Trimming %u bytes from the right of the window\n" |
711 | DEBUGF DEBUG_NETWORK_VERBOSE, "Trimming %u bytes from the right of the window\n" |
713 | sub ecx, eax ; remove data from the right side of window (decrease data length) |
712 | sub ecx, eax ; remove data from the right side of window (decrease data length) |
714 | and [edx + TCP_header.Flags], not (TH_PUSH or TH_FIN) |
713 | and [edx + TCP_header.Flags], not (TH_PUSH or TH_FIN) |
715 | .no_excess_data: |
714 | .no_excess_data: |
716 | 715 | ||
717 | ;----------------- |
716 | ;----------------- |
718 | ; Record timestamp |
717 | ; Record timestamp |
719 | 718 | ||
720 | ; If last ACK falls within this segments sequence numbers, record its timestamp |
719 | ; If last ACK falls within this segments sequence numbers, record its timestamp |
721 | test [temp_bits], TCP_BIT_TIMESTAMP |
720 | test [temp_bits], TCP_BIT_TIMESTAMP |
722 | jz .no_timestamp |
721 | jz .no_timestamp |
723 | mov eax, [ebx + TCP_SOCKET.last_ack_sent] |
722 | mov eax, [ebx + TCP_SOCKET.last_ack_sent] |
724 | sub eax, [edx + TCP_header.SequenceNumber] |
723 | sub eax, [edx + TCP_header.SequenceNumber] |
725 | jb .no_timestamp |
724 | jb .no_timestamp |
726 | test [ebx + TCP_header.Flags], TH_SYN or TH_FIN ; syn and fin occupy one byte |
725 | test [ebx + TCP_header.Flags], TH_SYN or TH_FIN ; syn and fin occupy one byte |
727 | jz @f |
726 | jz @f |
728 | dec eax |
727 | dec eax |
729 | @@: |
728 | @@: |
730 | sub eax, ecx |
729 | sub eax, ecx |
731 | jae .no_timestamp |
730 | jae .no_timestamp |
732 | 731 | ||
733 | DEBUGF DEBUG_NETWORK_VERBOSE, "Recording timestamp\n" |
732 | DEBUGF DEBUG_NETWORK_VERBOSE, "Recording timestamp\n" |
734 | 733 | ||
735 | mov eax, [timestamp] |
734 | mov eax, [timestamp] |
736 | mov [ebx + TCP_SOCKET.ts_recent_age], eax |
735 | mov [ebx + TCP_SOCKET.ts_recent_age], eax |
737 | mov eax, [ebx + TCP_SOCKET.ts_val] |
736 | mov eax, [ebx + TCP_SOCKET.ts_val] |
738 | mov [ebx + TCP_SOCKET.ts_recent], eax |
737 | mov [ebx + TCP_SOCKET.ts_recent], eax |
739 | .no_timestamp: |
738 | .no_timestamp: |
740 | 739 | ||
741 | ;------------------ |
740 | ;------------------ |
742 | ; Process RST flags |
741 | ; Process RST flags |
743 | 742 | ||
744 | test [edx + TCP_header.Flags], TH_RST |
743 | test [edx + TCP_header.Flags], TH_RST |
745 | jz .no_rst |
744 | jz .no_rst |
746 | 745 | ||
747 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Got an RST flag\n" |
746 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Got an RST flag\n" |
748 | 747 | ||
749 | mov eax, [ebx + TCP_SOCKET.t_state] |
748 | mov eax, [ebx + TCP_SOCKET.t_state] |
750 | shl eax, 2 |
749 | shl eax, 2 |
751 | jmp dword [eax + .rst_sw_list] |
750 | jmp dword [eax + .rst_sw_list] |
752 | 751 | ||
753 | .rst_sw_list: |
752 | .rst_sw_list: |
754 | dd .no_rst ; TCPS_CLOSED |
753 | dd .no_rst ; TCPS_CLOSED |
755 | dd .no_rst ; TCPS_LISTEN |
754 | dd .no_rst ; TCPS_LISTEN |
756 | dd .no_rst ; TCPS_SYN_SENT |
755 | dd .no_rst ; TCPS_SYN_SENT |
757 | dd .econnrefused ; TCPS_SYN_RECEIVED |
756 | dd .econnrefused ; TCPS_SYN_RECEIVED |
758 | dd .econnreset ; TCPS_ESTABLISHED |
757 | dd .econnreset ; TCPS_ESTABLISHED |
759 | dd .econnreset ; TCPS_CLOSE_WAIT |
758 | dd .econnreset ; TCPS_CLOSE_WAIT |
760 | dd .econnreset ; TCPS_FIN_WAIT_1 |
759 | dd .econnreset ; TCPS_FIN_WAIT_1 |
761 | dd .rst_close ; TCPS_CLOSING |
760 | dd .rst_close ; TCPS_CLOSING |
762 | dd .rst_close ; TCPS_LAST_ACK |
761 | dd .rst_close ; TCPS_LAST_ACK |
763 | dd .econnreset ; TCPS_FIN_WAIT_2 |
762 | dd .econnreset ; TCPS_FIN_WAIT_2 |
764 | dd .rst_close ; TCPS_TIMED_WAIT |
763 | dd .rst_close ; TCPS_TIMED_WAIT |
765 | 764 | ||
766 | .econnrefused: |
765 | .econnrefused: |
767 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Connection refused\n" |
766 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Connection refused\n" |
768 | 767 | ||
769 | mov [ebx + SOCKET.errorcode], ECONNREFUSED |
768 | mov [ebx + SOCKET.errorcode], ECONNREFUSED |
770 | jmp .close |
769 | jmp .close |
771 | 770 | ||
772 | .econnreset: |
771 | .econnreset: |
773 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Connection reset\n" |
772 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Connection reset\n" |
774 | 773 | ||
775 | mov [ebx + SOCKET.errorcode], ECONNRESET |
774 | mov [ebx + SOCKET.errorcode], ECONNRESET |
776 | 775 | ||
777 | .close: |
776 | .close: |
778 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Closing connection\n" |
777 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Closing connection\n" |
779 | 778 | ||
780 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
779 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
781 | ;;; TODO: update stats (tcp drops) |
780 | ;;; TODO: update stats (tcp drops) |
782 | mov eax, ebx |
781 | mov eax, ebx |
783 | call TCP_close |
782 | call TCP_close |
784 | jmp .drop_no_socket |
783 | jmp .drop_no_socket |
785 | 784 | ||
786 | .rst_close: |
785 | .rst_close: |
787 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Closing with reset\n" |
786 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Closing with reset\n" |
788 | 787 | ||
789 | mov eax, ebx |
788 | mov eax, ebx |
790 | call TCP_close |
789 | call TCP_close |
791 | jmp .drop_no_socket |
790 | jmp .drop_no_socket |
792 | 791 | ||
793 | .no_rst: |
792 | .no_rst: |
794 | 793 | ||
795 | ;-------------------------------------- |
794 | ;-------------------------------------- |
796 | ; handle SYN-full and ACK-less segments |
795 | ; handle SYN-full and ACK-less segments |
797 | 796 | ||
798 | test [edx + TCP_header.Flags], TH_SYN |
797 | test [edx + TCP_header.Flags], TH_SYN |
799 | jz .not_syn_full |
798 | jz .not_syn_full |
800 | 799 | ||
801 | mov eax, ebx |
800 | mov eax, ebx |
802 | mov ebx, ECONNRESET |
801 | mov ebx, ECONNRESET |
803 | call TCP_drop |
802 | call TCP_drop |
804 | jmp .drop_with_reset |
803 | jmp .drop_with_reset |
805 | .not_syn_full: |
804 | .not_syn_full: |
806 | 805 | ||
807 | ;--------------- |
806 | ;--------------- |
808 | ; ACK processing |
807 | ; ACK processing |
809 | 808 | ||
810 | test [edx + TCP_header.Flags], TH_ACK |
809 | test [edx + TCP_header.Flags], TH_ACK |
811 | jz .drop |
810 | jz .drop |
812 | 811 | ||
813 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
812 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
814 | jb .ack_processed ; states: closed, listen, syn_sent |
813 | jb .ack_processed ; states: closed, listen, syn_sent |
815 | ja .no_syn_rcv ; established, fin_wait_1, fin_wait_2, close_wait, closing, last_ack, time_wait |
814 | ja .no_syn_rcv ; established, fin_wait_1, fin_wait_2, close_wait, closing, last_ack, time_wait |
816 | 815 | ||
817 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: state=syn_received\n" |
816 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: state=syn_received\n" |
818 | 817 | ||
819 | mov eax, [edx + TCP_header.AckNumber] |
818 | mov eax, [edx + TCP_header.AckNumber] |
820 | cmp [ebx + TCP_SOCKET.SND_UNA], eax |
819 | cmp [ebx + TCP_SOCKET.SND_UNA], eax |
821 | ja .drop_with_reset |
820 | ja .drop_with_reset |
822 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
821 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
823 | ja .drop_with_reset |
822 | ja .drop_with_reset |
824 | 823 | ||
825 | ;;; TODO: update stats |
824 | ;;; TODO: update stats |
826 | 825 | ||
827 | mov eax, ebx |
826 | mov eax, ebx |
828 | call SOCKET_is_connected |
827 | call SOCKET_is_connected |
829 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
828 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
830 | 829 | ||
831 | ; Do window scaling? |
830 | ; Do window scaling? |
832 | 831 | ||
833 | test [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
832 | test [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
834 | jz @f |
833 | jz @f |
835 | test [ebx + TCP_SOCKET.t_flags], TF_REQ_SCALE |
834 | test [ebx + TCP_SOCKET.t_flags], TF_REQ_SCALE |
836 | jz @f |
835 | jz @f |
837 | 836 | ||
838 | push word [ebx + TCP_SOCKET.requested_s_scale] ; Set send and receive scale factors to the received values |
837 | push word [ebx + TCP_SOCKET.requested_s_scale] ; Set send and receive scale factors to the received values |
839 | pop word [ebx + TCP_SOCKET.SND_SCALE] |
838 | pop word [ebx + TCP_SOCKET.SND_SCALE] |
840 | @@: |
839 | @@: |
841 | 840 | ||
842 | call TCP_reassemble |
841 | call TCP_reassemble |
843 | 842 | ||
844 | mov eax, [edx + TCP_header.SequenceNumber] |
843 | mov eax, [edx + TCP_header.SequenceNumber] |
845 | dec eax |
844 | dec eax |
846 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
845 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
847 | 846 | ||
848 | .no_syn_rcv: |
847 | .no_syn_rcv: |
849 | 848 | ||
850 | ;------------------------- |
849 | ;------------------------- |
851 | ; check for duplicate ACKs |
850 | ; check for duplicate ACKs |
852 | 851 | ||
853 | mov eax, [edx + TCP_header.AckNumber] |
852 | mov eax, [edx + TCP_header.AckNumber] |
854 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
853 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
855 | ja .not_dup_ack |
854 | ja .not_dup_ack |
856 | 855 | ||
857 | test ecx, ecx |
856 | test ecx, ecx |
858 | jnz .reset_dupacks |
857 | jnz .reset_dupacks |
859 | 858 | ||
860 | mov eax, dword [edx + TCP_header.Window] |
859 | mov eax, dword [edx + TCP_header.Window] |
861 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
860 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
862 | jne .reset_dupacks |
861 | jne .reset_dupacks |
863 | 862 | ||
864 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Processing duplicate ACK\n" |
863 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Processing duplicate ACK\n" |
865 | 864 | ||
866 | ; If we have outstanding data, other than a window probe, this is a completely duplicate ACK |
865 | ; If we have outstanding data, other than a window probe, this is a completely duplicate ACK |
867 | ; (window info didnt change) The ACK is the biggest we've seen and we've seen exactly our rexmt threshold of them, |
866 | ; (window info didnt change) The ACK is the biggest we've seen and we've seen exactly our rexmt threshold of them, |
868 | ; assume a packet has been dropped and retransmit it. Kludge snd_nxt & the congestion window so we send only this one packet. |
867 | ; assume a packet has been dropped and retransmit it. Kludge snd_nxt & the congestion window so we send only this one packet. |
869 | 868 | ||
870 | test [ebx + TCP_SOCKET.timer_flags], timer_flag_retransmission |
869 | test [ebx + TCP_SOCKET.timer_flags], timer_flag_retransmission |
871 | jz @f |
870 | jz @f |
872 | 871 | ||
873 | mov eax, [edx + TCP_header.AckNumber] |
872 | mov eax, [edx + TCP_header.AckNumber] |
874 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
873 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
875 | je .dup_ack |
874 | je .dup_ack |
876 | 875 | ||
877 | @@: |
876 | @@: |
878 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
877 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
879 | jmp .not_dup_ack |
878 | jmp .not_dup_ack |
880 | 879 | ||
881 | .dup_ack: |
880 | .dup_ack: |
882 | inc [ebx + TCP_SOCKET.t_dupacks] |
881 | inc [ebx + TCP_SOCKET.t_dupacks] |
883 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
882 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
884 | jne .no_re_xmit |
883 | jne .no_re_xmit |
885 | 884 | ||
886 | push [ebx + TCP_SOCKET.SND_NXT] ; >>>> |
885 | push [ebx + TCP_SOCKET.SND_NXT] ; >>>> |
887 | 886 | ||
888 | mov eax, [ebx + TCP_SOCKET.SND_WND] |
887 | mov eax, [ebx + TCP_SOCKET.SND_WND] |
889 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
888 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
890 | jbe @f |
889 | jbe @f |
891 | mov eax, [ebx + TCP_SOCKET.SND_CWND] |
890 | mov eax, [ebx + TCP_SOCKET.SND_CWND] |
892 | @@: |
891 | @@: |
893 | shr eax, 1 |
892 | shr eax, 1 |
894 | push edx |
893 | push edx |
895 | xor edx, edx |
894 | xor edx, edx |
896 | div [ebx + TCP_SOCKET.t_maxseg] |
895 | div [ebx + TCP_SOCKET.t_maxseg] |
897 | cmp eax, 2 |
896 | cmp eax, 2 |
898 | ja @f |
897 | ja @f |
899 | xor eax, eax |
898 | xor eax, eax |
900 | mov al, 2 |
899 | mov al, 2 |
901 | @@: |
900 | @@: |
902 | mul [ebx + TCP_SOCKET.t_maxseg] |
901 | mul [ebx + TCP_SOCKET.t_maxseg] |
903 | pop edx |
902 | pop edx |
904 | mov [ebx + TCP_SOCKET.SND_SSTHRESH], eax |
903 | mov [ebx + TCP_SOCKET.SND_SSTHRESH], eax |
905 | 904 | ||
906 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission ; turn off retransmission timer |
905 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission ; turn off retransmission timer |
907 | mov [ebx + TCP_SOCKET.t_rtt], 0 |
906 | mov [ebx + TCP_SOCKET.t_rtt], 0 |
908 | mov eax, [edx + TCP_header.AckNumber] |
907 | mov eax, [edx + TCP_header.AckNumber] |
909 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
908 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
910 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
909 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
911 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
910 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
912 | 911 | ||
913 | ; Unlock the socket |
912 | ; Unlock the socket |
914 | push ebx |
913 | push ebx |
915 | lea ecx, [ebx + SOCKET.mutex] |
914 | lea ecx, [ebx + SOCKET.mutex] |
916 | call mutex_unlock |
915 | call mutex_unlock |
917 | 916 | ||
918 | ; retransmit missing segment |
917 | ; retransmit missing segment |
919 | mov eax, [esp] |
918 | mov eax, [esp] |
920 | call TCP_output |
919 | call TCP_output |
921 | 920 | ||
922 | ; Lock the socket again |
921 | ; Lock the socket again |
923 | mov ecx, [esp] |
922 | mov ecx, [esp] |
924 | add ecx, SOCKET.mutex |
923 | add ecx, SOCKET.mutex |
925 | call mutex_lock |
924 | call mutex_lock |
926 | pop ebx |
925 | pop ebx |
927 | 926 | ||
928 | ; Continue processing |
927 | ; Continue processing |
929 | xor edx, edx |
928 | xor edx, edx |
930 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
929 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
931 | mul [ebx + TCP_SOCKET.t_dupacks] |
930 | mul [ebx + TCP_SOCKET.t_dupacks] |
932 | add eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
931 | add eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
933 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
932 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
934 | 933 | ||
935 | pop eax ; <<<< |
934 | pop eax ; <<<< |
936 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
935 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
937 | jb @f |
936 | jb @f |
938 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
937 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
939 | @@: |
938 | @@: |
940 | 939 | ||
941 | jmp .drop |
940 | jmp .drop |
942 | 941 | ||
943 | 942 | ||
944 | .no_re_xmit: |
943 | .no_re_xmit: |
945 | jbe .not_dup_ack |
944 | jbe .not_dup_ack |
946 | 945 | ||
947 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Increasing congestion window\n" |
946 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Increasing congestion window\n" |
948 | 947 | ||
949 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
948 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
950 | add [ebx + TCP_SOCKET.SND_CWND], eax |
949 | add [ebx + TCP_SOCKET.SND_CWND], eax |
951 | 950 | ||
952 | ; Unlock the socket |
951 | ; Unlock the socket |
953 | push ebx |
952 | push ebx |
954 | lea ecx, [ebx + SOCKET.mutex] |
953 | lea ecx, [ebx + SOCKET.mutex] |
955 | call mutex_unlock |
954 | call mutex_unlock |
956 | 955 | ||
957 | ; retransmit missing segment |
956 | ; retransmit missing segment |
958 | mov eax, [esp] |
957 | mov eax, [esp] |
959 | call TCP_output |
958 | call TCP_output |
960 | 959 | ||
961 | ; Lock the socket again |
960 | ; Lock the socket again |
962 | mov ecx, [esp] |
961 | mov ecx, [esp] |
963 | add ecx, SOCKET.mutex |
962 | add ecx, SOCKET.mutex |
964 | call mutex_lock |
963 | call mutex_lock |
965 | pop ebx |
964 | pop ebx |
966 | 965 | ||
967 | jmp .drop |
966 | jmp .drop |
968 | 967 | ||
969 | 968 | ||
970 | .not_dup_ack: |
969 | .not_dup_ack: |
971 | 970 | ||
972 | ;------------------------------------------------- |
971 | ;------------------------------------------------- |
973 | ; If the congestion window was inflated to account |
972 | ; If the congestion window was inflated to account |
974 | ; for the other side's cached packets, retract it |
973 | ; for the other side's cached packets, retract it |
975 | 974 | ||
976 | mov eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
975 | mov eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
977 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
976 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
978 | ja @f |
977 | ja @f |
979 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
978 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
980 | jbe @f |
979 | jbe @f |
981 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
980 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
982 | @@: |
981 | @@: |
983 | 982 | ||
984 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
983 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
985 | 984 | ||
986 | mov eax, [edx + TCP_header.AckNumber] |
985 | mov eax, [edx + TCP_header.AckNumber] |
987 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
986 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
988 | jbe @f |
987 | jbe @f |
989 | inc [TCPS_rcvacktoomuch] |
988 | inc [TCPS_rcvacktoomuch] |
990 | jmp .drop_after_ack |
989 | jmp .drop_after_ack |
991 | @@: |
990 | @@: |
992 | 991 | ||
993 | mov edi, [edx + TCP_header.AckNumber] |
992 | mov edi, [edx + TCP_header.AckNumber] |
994 | sub edi, [ebx + TCP_SOCKET.SND_UNA] ; now we got the number of acked bytes in edi |
993 | sub edi, [ebx + TCP_SOCKET.SND_UNA] ; now we got the number of acked bytes in edi |
995 | inc [TCPS_rcvackpack] |
994 | inc [TCPS_rcvackpack] |
996 | add [TCPS_rcvackbyte], edi |
995 | add [TCPS_rcvackbyte], edi |
997 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: acceptable ACK for %u bytes\n", edi |
996 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: acceptable ACK for %u bytes\n", edi |
998 | 997 | ||
999 | ;------------------------------------------ |
998 | ;------------------------------------------ |
1000 | ; RTT measurements and retransmission timer |
999 | ; RTT measurements and retransmission timer |
1001 | 1000 | ||
1002 | ; If we have a timestamp, update smoothed RTT |
1001 | ; If we have a timestamp, update smoothed RTT |
1003 | 1002 | ||
1004 | test [temp_bits], TCP_BIT_TIMESTAMP |
1003 | test [temp_bits], TCP_BIT_TIMESTAMP |
1005 | jz .timestamp_not_present |
1004 | jz .timestamp_not_present |
1006 | mov eax, [timestamp] |
1005 | mov eax, [timestamp] |
1007 | sub eax, [ebx + TCP_SOCKET.ts_ecr] |
1006 | sub eax, [ebx + TCP_SOCKET.ts_ecr] |
1008 | inc eax |
1007 | inc eax |
1009 | call TCP_xmit_timer |
1008 | call TCP_xmit_timer |
1010 | jmp .rtt_done_ |
1009 | jmp .rtt_done_ |
1011 | 1010 | ||
1012 | ; If no timestamp but transmit timer is running and timed sequence number was acked, |
1011 | ; If no timestamp but transmit timer is running and timed sequence number was acked, |
1013 | ; update smoothed RTT. Since we now have an RTT measurement, cancel the timer backoff |
1012 | ; update smoothed RTT. Since we now have an RTT measurement, cancel the timer backoff |
1014 | ; (Phil Karn's retransmit algo) |
1013 | ; (Phil Karn's retransmit algo) |
1015 | ; Recompute the initial retransmit timer |
1014 | ; Recompute the initial retransmit timer |
1016 | 1015 | ||
1017 | .timestamp_not_present: |
1016 | .timestamp_not_present: |
1018 | mov eax, [edx + TCP_header.AckNumber] |
1017 | mov eax, [edx + TCP_header.AckNumber] |
1019 | cmp eax, [ebx + TCP_SOCKET.t_rtseq] |
1018 | cmp eax, [ebx + TCP_SOCKET.t_rtseq] |
1020 | jbe .rtt_done_ |
1019 | jbe .rtt_done_ |
1021 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
1020 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
1022 | test eax, eax |
1021 | test eax, eax |
1023 | jz .rtt_done_ |
1022 | jz .rtt_done_ |
1024 | call TCP_xmit_timer |
1023 | call TCP_xmit_timer |
1025 | 1024 | ||
1026 | .rtt_done_: |
1025 | .rtt_done_: |
1027 | 1026 | ||
1028 | ; If all outstanding data is acked, stop retransmit timer and remember to restart (more output or persist) |
1027 | ; If all outstanding data is acked, stop retransmit timer and remember to restart (more output or persist) |
1029 | ; If there is more data to be acked, restart retransmit timer, using current (possible backed-off) value. |
1028 | ; If there is more data to be acked, restart retransmit timer, using current (possible backed-off) value. |
1030 | 1029 | ||
1031 | mov eax, [ebx + TCP_SOCKET.SND_MAX] |
1030 | mov eax, [ebx + TCP_SOCKET.SND_MAX] |
1032 | cmp eax, [edx + TCP_header.AckNumber] |
1031 | cmp eax, [edx + TCP_header.AckNumber] |
1033 | jne .more_data |
1032 | jne .more_data |
1034 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission |
1033 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission |
1035 | or [temp_bits], TCP_BIT_NEEDOUTPUT |
1034 | or [temp_bits], TCP_BIT_NEEDOUTPUT |
1036 | jmp .no_restart |
1035 | jmp .no_restart |
1037 | .more_data: |
1036 | .more_data: |
1038 | test [ebx + TCP_SOCKET.timer_flags], timer_flag_persist |
1037 | test [ebx + TCP_SOCKET.timer_flags], timer_flag_persist |
1039 | jnz .no_restart |
1038 | jnz .no_restart |
1040 | 1039 | ||
1041 | mov eax, [ebx + TCP_SOCKET.t_rxtcur] |
1040 | mov eax, [ebx + TCP_SOCKET.t_rxtcur] |
1042 | mov [ebx + TCP_SOCKET.timer_retransmission], eax |
1041 | mov [ebx + TCP_SOCKET.timer_retransmission], eax |
1043 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_retransmission |
1042 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_retransmission |
1044 | .no_restart: |
1043 | .no_restart: |
1045 | 1044 | ||
1046 | 1045 | ||
1047 | ;------------------------------------------- |
1046 | ;------------------------------------------- |
1048 | ; Open congestion window in response to ACKs |
1047 | ; Open congestion window in response to ACKs |
1049 | 1048 | ||
1050 | mov esi, [ebx + TCP_SOCKET.SND_CWND] |
1049 | mov esi, [ebx + TCP_SOCKET.SND_CWND] |
1051 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
1050 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
1052 | 1051 | ||
1053 | cmp esi, [ebx + TCP_SOCKET.SND_SSTHRESH] |
1052 | cmp esi, [ebx + TCP_SOCKET.SND_SSTHRESH] |
1054 | jbe @f |
1053 | jbe @f |
1055 | push edx |
1054 | push edx |
1056 | push eax |
1055 | push eax |
1057 | mul eax |
1056 | mul eax |
1058 | div esi |
1057 | div esi |
1059 | pop edx |
1058 | pop edx |
1060 | shr edx, 3 |
1059 | shr edx, 3 |
1061 | add eax, edx |
1060 | add eax, edx |
1062 | pop edx |
1061 | pop edx |
1063 | @@: |
1062 | @@: |
1064 | 1063 | ||
1065 | add esi, eax |
1064 | add esi, eax |
1066 | 1065 | ||
1067 | push ecx |
1066 | push ecx |
1068 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
1067 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
1069 | mov eax, TCP_max_win |
1068 | mov eax, TCP_max_win |
1070 | shl eax, cl |
1069 | shl eax, cl |
1071 | pop ecx |
1070 | pop ecx |
1072 | 1071 | ||
1073 | cmp esi, eax |
1072 | cmp esi, eax |
1074 | jbe @f |
1073 | jbe @f |
1075 | mov esi, eax |
1074 | mov esi, eax |
1076 | @@: |
1075 | @@: |
1077 | mov [ebx + TCP_SOCKET.SND_CWND], esi |
1076 | mov [ebx + TCP_SOCKET.SND_CWND], esi |
1078 | 1077 | ||
1079 | ;------------------------------------------ |
1078 | ;------------------------------------------ |
1080 | ; Remove acknowledged data from send buffer |
1079 | ; Remove acknowledged data from send buffer |
1081 | 1080 | ||
1082 | cmp edi, [ebx + STREAM_SOCKET.snd.size] |
1081 | cmp edi, [ebx + STREAM_SOCKET.snd.size] |
1083 | jbe .finiacked |
1082 | jbe .finiacked |
1084 | 1083 | ||
1085 | push ecx edx ebx |
1084 | push ecx edx ebx |
1086 | mov ecx, [ebx + STREAM_SOCKET.snd.size] |
1085 | mov ecx, [ebx + STREAM_SOCKET.snd.size] |
1087 | lea eax, [ebx + STREAM_SOCKET.snd] |
1086 | lea eax, [ebx + STREAM_SOCKET.snd] |
1088 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
1087 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
1089 | call SOCKET_ring_free |
1088 | call SOCKET_ring_free |
1090 | pop ebx edx ecx |
1089 | pop ebx edx ecx |
1091 | 1090 | ||
1092 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: our FIN is acked\n" |
1091 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: our FIN is acked\n" |
1093 | or [temp_bits], TCP_BIT_FIN_IS_ACKED |
1092 | or [temp_bits], TCP_BIT_FIN_IS_ACKED |
1094 | jmp .wakeup |
1093 | jmp .wakeup |
1095 | 1094 | ||
1096 | .finiacked: |
1095 | .finiacked: |
1097 | 1096 | ||
1098 | push ecx edx ebx |
1097 | push ecx edx ebx |
1099 | mov ecx, edi |
1098 | mov ecx, edi |
1100 | lea eax, [ebx + STREAM_SOCKET.snd] |
1099 | lea eax, [ebx + STREAM_SOCKET.snd] |
1101 | call SOCKET_ring_free |
1100 | call SOCKET_ring_free |
1102 | pop ebx |
1101 | pop ebx |
1103 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
1102 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
1104 | pop edx ecx |
1103 | pop edx ecx |
1105 | 1104 | ||
1106 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: our FIN is not acked\n" |
1105 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: our FIN is not acked\n" |
1107 | 1106 | ||
1108 | ;---------------------------------------- |
1107 | ;---------------------------------------- |
1109 | ; Wake up process waiting on send buffer |
1108 | ; Wake up process waiting on send buffer |
1110 | 1109 | ||
1111 | .wakeup: |
1110 | .wakeup: |
1112 | mov eax, ebx |
1111 | mov eax, ebx |
1113 | call SOCKET_notify |
1112 | call SOCKET_notify |
1114 | 1113 | ||
1115 | ; Update TCPS |
1114 | ; Update TCPS |
1116 | mov eax, [edx + TCP_header.AckNumber] |
1115 | mov eax, [edx + TCP_header.AckNumber] |
1117 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
1116 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
1118 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
1117 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
1119 | jb @f |
1118 | jb @f |
1120 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
1119 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
1121 | @@: |
1120 | @@: |
1122 | 1121 | ||
1123 | ; General ACK handling complete |
1122 | ; General ACK handling complete |
1124 | ; Now do the state-specific ones |
1123 | ; Now do the state-specific ones |
1125 | ; Carry flag is set when our FIN is acked |
1124 | ; Carry flag is set when our FIN is acked |
1126 | 1125 | ||
1127 | mov eax, [ebx + TCP_SOCKET.t_state] |
1126 | mov eax, [ebx + TCP_SOCKET.t_state] |
1128 | jmp dword [eax*4 + .ACK_sw_list] |
1127 | jmp dword [eax*4 + .ACK_sw_list] |
1129 | 1128 | ||
1130 | .ACK_sw_list: |
1129 | .ACK_sw_list: |
1131 | dd .ack_processed ; TCPS_CLOSED |
1130 | dd .ack_processed ; TCPS_CLOSED |
1132 | dd .ack_processed ; TCPS_LISTEN |
1131 | dd .ack_processed ; TCPS_LISTEN |
1133 | dd .ack_processed ; TCPS_SYN_SENT |
1132 | dd .ack_processed ; TCPS_SYN_SENT |
1134 | dd .ack_processed ; TCPS_SYN_RECEIVED |
1133 | dd .ack_processed ; TCPS_SYN_RECEIVED |
1135 | dd .ack_processed ; TCPS_ESTABLISHED |
1134 | dd .ack_processed ; TCPS_ESTABLISHED |
1136 | dd .ack_processed ; TCPS_CLOSE_WAIT |
1135 | dd .ack_processed ; TCPS_CLOSE_WAIT |
1137 | dd .ack_fw1 ; TCPS_FIN_WAIT_1 |
1136 | dd .ack_fw1 ; TCPS_FIN_WAIT_1 |
1138 | dd .ack_c ; TCPS_CLOSING |
1137 | dd .ack_c ; TCPS_CLOSING |
1139 | dd .ack_la ; TCPS_LAST_ACK |
1138 | dd .ack_la ; TCPS_LAST_ACK |
1140 | dd .ack_processed ; TCPS_FIN_WAIT_2 |
1139 | dd .ack_processed ; TCPS_FIN_WAIT_2 |
1141 | dd .ack_tw ; TCPS_TIMED_WAIT |
1140 | dd .ack_tw ; TCPS_TIMED_WAIT |
1142 | 1141 | ||
1143 | 1142 | ||
1144 | .ack_fw1: |
1143 | .ack_fw1: |
1145 | test [temp_bits], TCP_BIT_FIN_IS_ACKED |
1144 | test [temp_bits], TCP_BIT_FIN_IS_ACKED |
1146 | jz .ack_processed |
1145 | jz .ack_processed |
1147 | 1146 | ||
1148 | test [ebx + SOCKET.state], SS_CANTRCVMORE |
1147 | test [ebx + SOCKET.state], SS_CANTRCVMORE |
1149 | jnz @f |
1148 | jnz @f |
1150 | mov eax, ebx |
1149 | mov eax, ebx |
1151 | call SOCKET_is_disconnected |
1150 | call SOCKET_is_disconnected |
1152 | mov [ebx + TCP_SOCKET.timer_timed_wait], TCP_time_max_idle |
1151 | mov [ebx + TCP_SOCKET.timer_timed_wait], TCP_time_max_idle |
1153 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
1152 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
1154 | @@: |
1153 | @@: |
1155 | mov [ebx + TCP_SOCKET.t_state], TCPS_FIN_WAIT_2 |
1154 | mov [ebx + TCP_SOCKET.t_state], TCPS_FIN_WAIT_2 |
1156 | jmp .ack_processed |
1155 | jmp .ack_processed |
1157 | 1156 | ||
1158 | .ack_c: |
1157 | .ack_c: |
1159 | test [temp_bits], TCP_BIT_FIN_IS_ACKED |
1158 | test [temp_bits], TCP_BIT_FIN_IS_ACKED |
1160 | jz .ack_processed |
1159 | jz .ack_processed |
1161 | 1160 | ||
1162 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1161 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1163 | mov eax, ebx |
1162 | mov eax, ebx |
1164 | call TCP_cancel_timers |
1163 | call TCP_cancel_timers |
1165 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
1164 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
1166 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
1165 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
1167 | mov eax, ebx |
1166 | mov eax, ebx |
1168 | call SOCKET_is_disconnected |
1167 | call SOCKET_is_disconnected |
1169 | jmp .ack_processed |
1168 | jmp .ack_processed |
1170 | 1169 | ||
1171 | .ack_la: |
1170 | .ack_la: |
1172 | test [temp_bits], TCP_BIT_FIN_IS_ACKED |
1171 | test [temp_bits], TCP_BIT_FIN_IS_ACKED |
1173 | jz .ack_processed |
1172 | jz .ack_processed |
1174 | 1173 | ||
1175 | push ebx |
1174 | push ebx |
1176 | lea ecx, [ebx + SOCKET.mutex] |
1175 | lea ecx, [ebx + SOCKET.mutex] |
1177 | call mutex_unlock |
1176 | call mutex_unlock |
1178 | pop ebx |
1177 | pop ebx |
1179 | 1178 | ||
1180 | mov eax, ebx |
1179 | mov eax, ebx |
1181 | call TCP_close |
1180 | call TCP_close |
1182 | jmp .drop_no_socket |
1181 | jmp .drop_no_socket |
1183 | 1182 | ||
1184 | .ack_tw: |
1183 | .ack_tw: |
1185 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
1184 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
1186 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
1185 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
1187 | jmp .drop_after_ack |
1186 | jmp .drop_after_ack |
1188 | 1187 | ||
1189 | .reset_dupacks: ; We got a new ACK, reset duplicate ACK counter |
1188 | .reset_dupacks: ; We got a new ACK, reset duplicate ACK counter |
1190 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
1189 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
1191 | jmp .ack_processed |
1190 | jmp .ack_processed |
1192 | 1191 | ||
1193 | ;------- |
1192 | ;------- |
1194 | ; LISTEN |
1193 | ; LISTEN |
1195 | 1194 | ||
1196 | align 4 |
1195 | align 4 |
1197 | .LISTEN: |
1196 | .LISTEN: |
1198 | 1197 | ||
1199 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: state=listen\n" |
1198 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: state=listen\n" |
1200 | 1199 | ||
1201 | test [edx + TCP_header.Flags], TH_RST |
1200 | test [edx + TCP_header.Flags], TH_RST |
1202 | jnz .drop |
1201 | jnz .drop |
1203 | 1202 | ||
1204 | test [edx + TCP_header.Flags], TH_ACK |
1203 | test [edx + TCP_header.Flags], TH_ACK |
1205 | jnz .drop_with_reset |
1204 | jnz .drop_with_reset |
1206 | 1205 | ||
1207 | test [edx + TCP_header.Flags], TH_SYN |
1206 | test [edx + TCP_header.Flags], TH_SYN |
1208 | jz .drop |
1207 | jz .drop |
1209 | 1208 | ||
1210 | inc [TCPS_accepts] ; update stats |
1209 | inc [TCPS_accepts] ; update stats |
1211 | 1210 | ||
1212 | ;;; TODO: check if it's a broadcast or multicast, and drop if so |
1211 | ;;; TODO: check if it's a broadcast or multicast, and drop if so |
1213 | 1212 | ||
1214 | push dword [edi] ; Ipv4 source addres |
1213 | push [edi + IPv4_header.SourceAddress] |
1215 | pop [ebx + IP_SOCKET.RemoteIP] |
1214 | pop [ebx + IP_SOCKET.RemoteIP] |
1216 | 1215 | ||
1217 | push [edx + TCP_header.SourcePort] |
1216 | push [edx + TCP_header.SourcePort] |
1218 | pop [ebx + TCP_SOCKET.RemotePort] |
1217 | pop [ebx + TCP_SOCKET.RemotePort] |
1219 | 1218 | ||
1220 | push [edx + TCP_header.SequenceNumber] |
1219 | push [edx + TCP_header.SequenceNumber] |
1221 | pop [ebx + TCP_SOCKET.IRS] |
1220 | pop [ebx + TCP_SOCKET.IRS] |
1222 | 1221 | ||
1223 | mov eax, [TCP_sequence_num] |
1222 | mov eax, [TCP_sequence_num] |
1224 | add [TCP_sequence_num], 64000 / 2 |
1223 | add [TCP_sequence_num], 64000 / 2 |
1225 | mov [ebx + TCP_SOCKET.ISS], eax |
1224 | mov [ebx + TCP_SOCKET.ISS], eax |
1226 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
1225 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
1227 | 1226 | ||
1228 | TCP_sendseqinit ebx |
1227 | TCP_sendseqinit ebx |
1229 | TCP_rcvseqinit ebx |
1228 | TCP_rcvseqinit ebx |
1230 | 1229 | ||
1231 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
1230 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
1232 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1231 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1233 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval ;;;; macro |
1232 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval ;;;; macro |
1234 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_keepalive |
1233 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_keepalive |
1235 | 1234 | ||
1236 | lea eax, [ebx + STREAM_SOCKET.snd] |
1235 | lea eax, [ebx + STREAM_SOCKET.snd] |
1237 | call SOCKET_ring_create |
1236 | call SOCKET_ring_create |
1238 | test eax, eax |
1237 | test eax, eax |
1239 | jz .drop |
1238 | jz .drop |
1240 | 1239 | ||
1241 | lea eax, [ebx + STREAM_SOCKET.rcv] |
1240 | lea eax, [ebx + STREAM_SOCKET.rcv] |
1242 | call SOCKET_ring_create |
1241 | call SOCKET_ring_create |
1243 | test eax, eax |
1242 | test eax, eax |
1244 | jz .drop |
1243 | jz .drop |
1245 | 1244 | ||
1246 | and [temp_bits], not TCP_BIT_DROPSOCKET |
1245 | and [temp_bits], not TCP_BIT_DROPSOCKET |
1247 | 1246 | ||
1248 | pusha |
1247 | pusha |
1249 | mov eax, ebx |
1248 | mov eax, ebx |
1250 | call SOCKET_notify |
1249 | call SOCKET_notify |
1251 | popa |
1250 | popa |
1252 | 1251 | ||
1253 | jmp .trim |
1252 | jmp .trim |
1254 | 1253 | ||
1255 | ;------------ |
1254 | ;------------ |
1256 | ; Active Open |
1255 | ; Active Open |
1257 | 1256 | ||
1258 | align 4 |
1257 | align 4 |
1259 | .SYN_SENT: |
1258 | .SYN_SENT: |
1260 | 1259 | ||
1261 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: state=syn_sent\n" |
1260 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: state=syn_sent\n" |
1262 | 1261 | ||
1263 | test [edx + TCP_header.Flags], TH_ACK |
1262 | test [edx + TCP_header.Flags], TH_ACK |
1264 | jz @f |
1263 | jz @f |
1265 | 1264 | ||
1266 | mov eax, [edx + TCP_header.AckNumber] |
1265 | mov eax, [edx + TCP_header.AckNumber] |
1267 | cmp eax, [ebx + TCP_SOCKET.ISS] |
1266 | cmp eax, [ebx + TCP_SOCKET.ISS] |
1268 | jbe .drop_with_reset |
1267 | jbe .drop_with_reset |
1269 | 1268 | ||
1270 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
1269 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
1271 | ja .drop_with_reset |
1270 | ja .drop_with_reset |
1272 | @@: |
1271 | @@: |
1273 | 1272 | ||
1274 | test [edx + TCP_header.Flags], TH_RST |
1273 | test [edx + TCP_header.Flags], TH_RST |
1275 | jz @f |
1274 | jz @f |
1276 | 1275 | ||
1277 | test [edx + TCP_header.Flags], TH_ACK |
1276 | test [edx + TCP_header.Flags], TH_ACK |
1278 | jz .drop |
1277 | jz .drop |
1279 | 1278 | ||
1280 | mov eax, ebx |
1279 | mov eax, ebx |
1281 | mov ebx, ECONNREFUSED |
1280 | mov ebx, ECONNREFUSED |
1282 | call TCP_drop |
1281 | call TCP_drop |
1283 | 1282 | ||
1284 | jmp .drop |
1283 | jmp .drop |
1285 | @@: |
1284 | @@: |
1286 | 1285 | ||
1287 | test [edx + TCP_header.Flags], TH_SYN |
1286 | test [edx + TCP_header.Flags], TH_SYN |
1288 | jz .drop |
1287 | jz .drop |
1289 | 1288 | ||
1290 | ; at this point, segment seems to be valid |
1289 | ; at this point, segment seems to be valid |
1291 | 1290 | ||
1292 | test [edx + TCP_header.Flags], TH_ACK |
1291 | test [edx + TCP_header.Flags], TH_ACK |
1293 | jz .no_syn_ack |
1292 | jz .no_syn_ack |
1294 | 1293 | ||
1295 | ; now, process received SYN in response to an active open |
1294 | ; now, process received SYN in response to an active open |
1296 | 1295 | ||
1297 | mov eax, [edx + TCP_header.AckNumber] |
1296 | mov eax, [edx + TCP_header.AckNumber] |
1298 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
1297 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
1299 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
1298 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
1300 | jbe @f |
1299 | jbe @f |
1301 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
1300 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
1302 | @@: |
1301 | @@: |
1303 | 1302 | ||
1304 | .no_syn_ack: |
1303 | .no_syn_ack: |
1305 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission ; disable retransmission timer |
1304 | and [ebx + TCP_SOCKET.timer_flags], not timer_flag_retransmission ; disable retransmission timer |
1306 | 1305 | ||
1307 | push [edx + TCP_header.SequenceNumber] |
1306 | push [edx + TCP_header.SequenceNumber] |
1308 | pop [ebx + TCP_SOCKET.IRS] |
1307 | pop [ebx + TCP_SOCKET.IRS] |
1309 | 1308 | ||
1310 | TCP_rcvseqinit ebx |
1309 | TCP_rcvseqinit ebx |
1311 | 1310 | ||
1312 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1311 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1313 | 1312 | ||
1314 | mov eax, [ebx + TCP_SOCKET.SND_UNA] |
1313 | mov eax, [ebx + TCP_SOCKET.SND_UNA] |
1315 | cmp eax, [ebx + TCP_SOCKET.ISS] |
1314 | cmp eax, [ebx + TCP_SOCKET.ISS] |
1316 | jbe .simultaneous_open |
1315 | jbe .simultaneous_open |
1317 | 1316 | ||
1318 | test [edx + TCP_header.Flags], TH_ACK |
1317 | test [edx + TCP_header.Flags], TH_ACK |
1319 | jz .simultaneous_open |
1318 | jz .simultaneous_open |
1320 | 1319 | ||
1321 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: active open\n" |
1320 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: active open\n" |
1322 | 1321 | ||
1323 | ;;; TODO: update stats |
1322 | ;;; TODO: update stats |
1324 | 1323 | ||
1325 | ; set socket state to connected |
1324 | ; set socket state to connected |
1326 | push eax |
1325 | push eax |
1327 | mov eax, ebx |
1326 | mov eax, ebx |
1328 | call SOCKET_is_connected |
1327 | call SOCKET_is_connected |
1329 | pop eax |
1328 | pop eax |
1330 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
1329 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
1331 | 1330 | ||
1332 | ; Do window scaling on this connection ? |
1331 | ; Do window scaling on this connection ? |
1333 | mov eax, [ebx + TCP_SOCKET.t_flags] |
1332 | mov eax, [ebx + TCP_SOCKET.t_flags] |
1334 | and eax, TF_REQ_SCALE or TF_RCVD_SCALE |
1333 | and eax, TF_REQ_SCALE or TF_RCVD_SCALE |
1335 | cmp eax, TF_REQ_SCALE or TF_RCVD_SCALE |
1334 | cmp eax, TF_REQ_SCALE or TF_RCVD_SCALE |
1336 | jne .no_scaling |
1335 | jne .no_scaling |
1337 | 1336 | ||
1338 | mov ax, word [ebx + TCP_SOCKET.requested_s_scale] |
1337 | mov ax, word [ebx + TCP_SOCKET.requested_s_scale] |
1339 | mov word [ebx + TCP_SOCKET.SND_SCALE], ax |
1338 | mov word [ebx + TCP_SOCKET.SND_SCALE], ax |
1340 | .no_scaling: |
1339 | .no_scaling: |
1341 | 1340 | ||
1342 | ;;; TODO: reassemble packets queue |
1341 | ;;; TODO: reassemble packets queue |
1343 | 1342 | ||
1344 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
1343 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
1345 | test eax, eax |
1344 | test eax, eax |
1346 | je .trim |
1345 | je .trim |
1347 | call TCP_xmit_timer |
1346 | call TCP_xmit_timer |
1348 | jmp .trim |
1347 | jmp .trim |
1349 | 1348 | ||
1350 | .simultaneous_open: |
1349 | .simultaneous_open: |
1351 | 1350 | ||
1352 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: simultaneous open\n" |
1351 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: simultaneous open\n" |
1353 | ; We have received a syn but no ACK, so we are having a simultaneous open.. |
1352 | ; We have received a syn but no ACK, so we are having a simultaneous open.. |
1354 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
1353 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
1355 | 1354 | ||
1356 | ;------------------------------------- |
1355 | ;------------------------------------- |
1357 | ; Common processing for receipt of SYN |
1356 | ; Common processing for receipt of SYN |
1358 | 1357 | ||
1359 | .trim: |
1358 | .trim: |
1360 | inc [edx + TCP_header.SequenceNumber] |
1359 | inc [edx + TCP_header.SequenceNumber] |
1361 | 1360 | ||
1362 | ; Drop any received data that doesnt fit in the receive window. |
1361 | ; Drop any received data that doesnt fit in the receive window. |
1363 | cmp ecx, [ebx + TCP_SOCKET.RCV_WND] |
1362 | cmp ecx, [ebx + TCP_SOCKET.RCV_WND] |
1364 | jbe .dont_trim |
1363 | jbe .dont_trim |
1365 | 1364 | ||
1366 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: received data does not fit in window, trimming %u bytes\n", eax |
1365 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: received data does not fit in window, trimming %u bytes\n", eax |
1367 | mov ecx, [ebx + TCP_SOCKET.RCV_WND] |
1366 | mov ecx, [ebx + TCP_SOCKET.RCV_WND] |
1368 | and [edx + TCP_header.Flags], not (TH_FIN) |
1367 | and [edx + TCP_header.Flags], not (TH_FIN) |
1369 | ;;; TODO: update stats |
1368 | ;;; TODO: update stats |
1370 | 1369 | ||
1371 | .dont_trim: |
1370 | .dont_trim: |
1372 | mov eax, [edx + TCP_header.SequenceNumber] |
1371 | mov eax, [edx + TCP_header.SequenceNumber] |
1373 | mov [ebx + TCP_SOCKET.RCV_UP], eax |
1372 | mov [ebx + TCP_SOCKET.RCV_UP], eax |
1374 | dec eax |
1373 | dec eax |
1375 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
1374 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
1376 | 1375 | ||
1377 | .ack_processed: |
1376 | .ack_processed: |
1378 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: ACK processed\n" |
1377 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: ACK processed\n" |
1379 | 1378 | ||
1380 | ;---------------------------------------------- |
1379 | ;---------------------------------------------- |
1381 | ; check if we need to update window information |
1380 | ; check if we need to update window information |
1382 | 1381 | ||
1383 | test [edx + TCP_header.Flags], TH_ACK |
1382 | test [edx + TCP_header.Flags], TH_ACK |
1384 | jz .no_window_update |
1383 | jz .no_window_update |
1385 | 1384 | ||
1386 | mov eax, [ebx + TCP_SOCKET.SND_WL1] |
1385 | mov eax, [ebx + TCP_SOCKET.SND_WL1] |
1387 | cmp eax, [edx + TCP_header.SequenceNumber] |
1386 | cmp eax, [edx + TCP_header.SequenceNumber] |
1388 | jb .update_window |
1387 | jb .update_window |
1389 | ja @f |
1388 | ja @f |
1390 | 1389 | ||
1391 | mov eax, [ebx + TCP_SOCKET.SND_WL2] |
1390 | mov eax, [ebx + TCP_SOCKET.SND_WL2] |
1392 | cmp eax, [edx + TCP_header.AckNumber] |
1391 | cmp eax, [edx + TCP_header.AckNumber] |
1393 | jb .update_window |
1392 | jb .update_window |
1394 | ja .no_window_update |
1393 | ja .no_window_update |
1395 | @@: |
1394 | @@: |
1396 | 1395 | ||
1397 | mov eax, dword [edx + TCP_header.Window] |
1396 | mov eax, dword [edx + TCP_header.Window] |
1398 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
1397 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
1399 | jbe .no_window_update |
1398 | jbe .no_window_update |
1400 | 1399 | ||
1401 | .update_window: |
1400 | .update_window: |
1402 | 1401 | ||
1403 | ;;; TODO: update stats (Keep track of pure window updates) |
1402 | ;;; TODO: update stats (Keep track of pure window updates) |
1404 | 1403 | ||
1405 | mov eax, dword [edx + TCP_header.Window] |
1404 | mov eax, dword [edx + TCP_header.Window] |
1406 | cmp eax, [ebx + TCP_SOCKET.max_sndwnd] |
1405 | cmp eax, [ebx + TCP_SOCKET.max_sndwnd] |
1407 | jbe @f |
1406 | jbe @f |
1408 | mov [ebx + TCP_SOCKET.max_sndwnd], eax |
1407 | mov [ebx + TCP_SOCKET.max_sndwnd], eax |
1409 | @@: |
1408 | @@: |
1410 | mov [ebx + TCP_SOCKET.SND_WND], eax |
1409 | mov [ebx + TCP_SOCKET.SND_WND], eax |
1411 | 1410 | ||
1412 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Updating window to %u\n", eax |
1411 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Updating window to %u\n", eax |
1413 | 1412 | ||
1414 | push [edx + TCP_header.SequenceNumber] |
1413 | push [edx + TCP_header.SequenceNumber] |
1415 | pop [ebx + TCP_SOCKET.SND_WL1] |
1414 | pop [ebx + TCP_SOCKET.SND_WL1] |
1416 | 1415 | ||
1417 | push [edx + TCP_header.AckNumber] |
1416 | push [edx + TCP_header.AckNumber] |
1418 | pop [ebx + TCP_SOCKET.SND_WL2] |
1417 | pop [ebx + TCP_SOCKET.SND_WL2] |
1419 | 1418 | ||
1420 | or [temp_bits], TCP_BIT_NEEDOUTPUT |
1419 | or [temp_bits], TCP_BIT_NEEDOUTPUT |
1421 | 1420 | ||
1422 | .no_window_update: |
1421 | .no_window_update: |
1423 | 1422 | ||
1424 | ;----------------- |
1423 | ;----------------- |
1425 | ; process URG flag |
1424 | ; process URG flag |
1426 | 1425 | ||
1427 | test [edx + TCP_header.Flags], TH_URG |
1426 | test [edx + TCP_header.Flags], TH_URG |
1428 | jz .not_urgent |
1427 | jz .not_urgent |
1429 | 1428 | ||
1430 | cmp [edx + TCP_header.UrgentPointer], 0 |
1429 | cmp [edx + TCP_header.UrgentPointer], 0 |
1431 | jz .not_urgent |
1430 | jz .not_urgent |
1432 | 1431 | ||
1433 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1432 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1434 | je .not_urgent |
1433 | je .not_urgent |
1435 | 1434 | ||
1436 | ; Ignore bogus urgent offsets |
1435 | ; Ignore bogus urgent offsets |
1437 | 1436 | ||
1438 | movzx eax, [edx + TCP_header.UrgentPointer] |
1437 | movzx eax, [edx + TCP_header.UrgentPointer] |
1439 | add eax, [ebx + STREAM_SOCKET.rcv.size] |
1438 | add eax, [ebx + STREAM_SOCKET.rcv.size] |
1440 | cmp eax, SOCKET_MAXDATA |
1439 | cmp eax, SOCKET_MAXDATA |
1441 | jbe .not_urgent |
1440 | jbe .not_urgent |
1442 | 1441 | ||
1443 | mov [edx + TCP_header.UrgentPointer], 0 |
1442 | mov [edx + TCP_header.UrgentPointer], 0 |
1444 | and [edx + TCP_header.Flags], not (TH_URG) |
1443 | and [edx + TCP_header.Flags], not (TH_URG) |
1445 | jmp .do_data |
1444 | jmp .do_data |
1446 | 1445 | ||
1447 | .not_urgent: |
1446 | .not_urgent: |
1448 | 1447 | ||
1449 | ; processing of received urgent pointer |
1448 | ; processing of received urgent pointer |
1450 | 1449 | ||
1451 | ;;; TODO (1051-1093) |
1450 | ;;; TODO (1051-1093) |
1452 | 1451 | ||
1453 | 1452 | ||
1454 | ;--------------------------------------- |
1453 | ;--------------------------------------- |
1455 | ; process the data in the segment (1094) |
1454 | ; process the data in the segment (1094) |
1456 | 1455 | ||
1457 | .do_data: |
1456 | .do_data: |
1458 | 1457 | ||
1459 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1458 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1460 | jae .final_processing |
1459 | jae .final_processing |
1461 | 1460 | ||
1462 | test [edx + TCP_header.Flags], TH_FIN |
1461 | test [edx + TCP_header.Flags], TH_FIN |
1463 | jnz @f |
1462 | jnz @f |
1464 | 1463 | ||
1465 | test ecx, ecx |
1464 | test ecx, ecx |
1466 | jz .final_processing |
1465 | jz .final_processing |
1467 | @@: |
1466 | @@: |
1468 | 1467 | ||
1469 | ; The segment is in order? |
1468 | ; The segment is in order? |
1470 | mov eax, [edx + TCP_header.SequenceNumber] |
1469 | mov eax, [edx + TCP_header.SequenceNumber] |
1471 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
1470 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
1472 | jne .out_of_order |
1471 | jne .out_of_order |
1473 | 1472 | ||
1474 | ; The reassembly queue is empty? |
1473 | ; The reassembly queue is empty? |
1475 | cmp [ebx + TCP_SOCKET.seg_next], 0 |
1474 | cmp [ebx + TCP_SOCKET.seg_next], 0 |
1476 | jne .out_of_order |
1475 | jne .out_of_order |
1477 | 1476 | ||
1478 | ; The connection is established? |
1477 | ; The connection is established? |
1479 | cmp [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
1478 | cmp [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
1480 | jne .out_of_order |
1479 | jne .out_of_order |
1481 | 1480 | ||
1482 | ; Ok, lets do this.. Set delayed ACK flag and copy data into socket buffer |
1481 | ; Ok, lets do this.. Set delayed ACK flag and copy data into socket buffer |
1483 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK |
1482 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK |
1484 | 1483 | ||
1485 | pusha |
1484 | pusha |
1486 | mov esi, [dataoffset] |
1485 | mov esi, [dataoffset] |
1487 | add esi, edx |
1486 | add esi, edx |
1488 | lea eax, [ebx + STREAM_SOCKET.rcv] |
1487 | lea eax, [ebx + STREAM_SOCKET.rcv] |
1489 | call SOCKET_ring_write ; Add the data to the socket buffer |
1488 | call SOCKET_ring_write ; Add the data to the socket buffer |
1490 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
1489 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
1491 | popa |
1490 | popa |
1492 | 1491 | ||
1493 | ; Wake up the sleeping process |
1492 | ; Wake up the sleeping process |
1494 | mov eax, ebx |
1493 | mov eax, ebx |
1495 | call SOCKET_notify |
1494 | call SOCKET_notify |
1496 | 1495 | ||
1497 | jmp .data_done |
1496 | jmp .data_done |
1498 | 1497 | ||
1499 | .out_of_order: |
1498 | .out_of_order: |
1500 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP data is out of order!\nSequencenumber is %u, we expected %u.\n", \ |
1499 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP data is out of order!\nSequencenumber is %u, we expected %u.\n", \ |
1501 | [edx + TCP_header.SequenceNumber], [ebx + TCP_SOCKET.RCV_NXT] |
1500 | [edx + TCP_header.SequenceNumber], [ebx + TCP_SOCKET.RCV_NXT] |
1502 | 1501 | ||
1503 | ; Uh-oh, some data is out of order, lets call TCP reassemble for help |
1502 | ; Uh-oh, some data is out of order, lets call TCP reassemble for help |
1504 | 1503 | ||
1505 | call TCP_reassemble |
1504 | call TCP_reassemble |
1506 | 1505 | ||
1507 | ; Generate ACK immediately, to let the other end know that a segment was received out of order, |
1506 | ; Generate ACK immediately, to let the other end know that a segment was received out of order, |
1508 | ; and to tell it what sequence number is expected. This aids the fast-retransmit algorithm. |
1507 | ; and to tell it what sequence number is expected. This aids the fast-retransmit algorithm. |
1509 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1508 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1510 | .data_done: |
1509 | .data_done: |
1511 | 1510 | ||
1512 | ;--------------- |
1511 | ;--------------- |
1513 | ; FIN processing |
1512 | ; FIN processing |
1514 | 1513 | ||
1515 | test [edx + TCP_header.Flags], TH_FIN |
1514 | test [edx + TCP_header.Flags], TH_FIN |
1516 | jz .final_processing |
1515 | jz .final_processing |
1517 | 1516 | ||
1518 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Processing FIN\n" |
1517 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Processing FIN\n" |
1519 | 1518 | ||
1520 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1519 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1521 | jae .not_first_fin |
1520 | jae .not_first_fin |
1522 | 1521 | ||
1523 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: First FIN for this connection\n" |
1522 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: First FIN for this connection\n" |
1524 | 1523 | ||
1525 | mov eax, ebx |
1524 | mov eax, ebx |
1526 | call SOCKET_cant_recv_more |
1525 | call SOCKET_cant_recv_more |
1527 | 1526 | ||
1528 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1527 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1529 | inc [ebx + TCP_SOCKET.RCV_NXT] |
1528 | inc [ebx + TCP_SOCKET.RCV_NXT] |
1530 | 1529 | ||
1531 | .not_first_fin: |
1530 | .not_first_fin: |
1532 | mov eax, [ebx + TCP_SOCKET.t_state] |
1531 | mov eax, [ebx + TCP_SOCKET.t_state] |
1533 | shl eax, 2 |
1532 | shl eax, 2 |
1534 | jmp dword [eax + .FIN_sw_list] |
1533 | jmp dword [eax + .FIN_sw_list] |
1535 | 1534 | ||
1536 | .FIN_sw_list: |
1535 | .FIN_sw_list: |
1537 | dd .final_processing ; TCPS_CLOSED |
1536 | dd .final_processing ; TCPS_CLOSED |
1538 | dd .final_processing ; TCPS_LISTEN |
1537 | dd .final_processing ; TCPS_LISTEN |
1539 | dd .final_processing ; TCPS_SYN_SENT |
1538 | dd .final_processing ; TCPS_SYN_SENT |
1540 | dd .fin_syn_est ; TCPS_SYN_RECEIVED |
1539 | dd .fin_syn_est ; TCPS_SYN_RECEIVED |
1541 | dd .fin_syn_est ; TCPS_ESTABLISHED |
1540 | dd .fin_syn_est ; TCPS_ESTABLISHED |
1542 | dd .final_processing ; TCPS_CLOSE_WAIT |
1541 | dd .final_processing ; TCPS_CLOSE_WAIT |
1543 | dd .fin_wait1 ; TCPS_FIN_WAIT_1 |
1542 | dd .fin_wait1 ; TCPS_FIN_WAIT_1 |
1544 | dd .final_processing ; TCPS_CLOSING |
1543 | dd .final_processing ; TCPS_CLOSING |
1545 | dd .final_processing ; TCPS_LAST_ACK |
1544 | dd .final_processing ; TCPS_LAST_ACK |
1546 | dd .fin_wait2 ; TCPS_FIN_WAIT_2 |
1545 | dd .fin_wait2 ; TCPS_FIN_WAIT_2 |
1547 | dd .fin_timed ; TCPS_TIMED_WAIT |
1546 | dd .fin_timed ; TCPS_TIMED_WAIT |
1548 | 1547 | ||
1549 | .fin_syn_est: |
1548 | .fin_syn_est: |
1550 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
1549 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
1551 | jmp .final_processing |
1550 | jmp .final_processing |
1552 | 1551 | ||
1553 | .fin_wait1: |
1552 | .fin_wait1: |
1554 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSING |
1553 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSING |
1555 | jmp .final_processing |
1554 | jmp .final_processing |
1556 | 1555 | ||
1557 | .fin_wait2: |
1556 | .fin_wait2: |
1558 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1557 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1559 | mov eax, ebx |
1558 | mov eax, ebx |
1560 | call TCP_cancel_timers |
1559 | call TCP_cancel_timers |
1561 | call SOCKET_is_disconnected |
1560 | call SOCKET_is_disconnected |
1562 | 1561 | ||
1563 | .fin_timed: |
1562 | .fin_timed: |
1564 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
1563 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
1565 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
1564 | or [ebx + TCP_SOCKET.timer_flags], timer_flag_wait |
1566 | 1565 | ||
1567 | ;----------------- |
1566 | ;----------------- |
1568 | ; Final processing |
1567 | ; Final processing |
1569 | 1568 | ||
1570 | .final_processing: |
1569 | .final_processing: |
1571 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Final processing\n" |
1570 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Final processing\n" |
1572 | 1571 | ||
1573 | push ebx |
1572 | push ebx |
1574 | lea ecx, [ebx + SOCKET.mutex] |
1573 | lea ecx, [ebx + SOCKET.mutex] |
1575 | call mutex_unlock |
1574 | call mutex_unlock |
1576 | pop eax |
1575 | pop eax |
1577 | 1576 | ||
1578 | test [temp_bits], TCP_BIT_NEEDOUTPUT |
1577 | test [temp_bits], TCP_BIT_NEEDOUTPUT |
1579 | jnz .need_output |
1578 | jnz .need_output |
1580 | 1579 | ||
1581 | test [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
1580 | test [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
1582 | jz .done |
1581 | jz .done |
1583 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: ACK now!\n" |
1582 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: ACK now!\n" |
1584 | 1583 | ||
1585 | .need_output: |
1584 | .need_output: |
1586 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: need output\n" |
1585 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: need output\n" |
1587 | call TCP_output |
1586 | call TCP_output |
1588 | 1587 | ||
1589 | .done: |
1588 | .done: |
1590 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: dumping\n" |
1589 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: dumping\n" |
1591 | 1590 | ||
1592 | call NET_BUFF_free |
1591 | call NET_BUFF_free |
1593 | jmp .loop |
1592 | jmp .loop |
1594 | 1593 | ||
1595 | 1594 | ||
1596 | ;----------------- |
1595 | ;----------------- |
1597 | ; Drop the segment |
1596 | ; Drop the segment |
1598 | 1597 | ||
1599 | 1598 | ||
1600 | .drop_after_ack: |
1599 | .drop_after_ack: |
1601 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Drop after ACK\n" |
1600 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Drop after ACK\n" |
1602 | 1601 | ||
1603 | push edx ebx |
1602 | push edx ebx |
1604 | lea ecx, [ebx + SOCKET.mutex] |
1603 | lea ecx, [ebx + SOCKET.mutex] |
1605 | call mutex_unlock |
1604 | call mutex_unlock |
1606 | pop eax edx |
1605 | pop eax edx |
1607 | 1606 | ||
1608 | test [edx + TCP_header.Flags], TH_RST |
1607 | test [edx + TCP_header.Flags], TH_RST |
1609 | jnz .done |
1608 | jnz .done |
1610 | 1609 | ||
1611 | or [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
1610 | or [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
1612 | jmp .need_output |
1611 | jmp .need_output |
1613 | 1612 | ||
1614 | .drop_with_reset: |
1613 | .drop_with_reset: |
1615 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Drop with reset\n" |
1614 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Drop with reset\n" |
1616 | 1615 | ||
1617 | push ebx edx |
1616 | push ebx edx |
1618 | lea ecx, [ebx + SOCKET.mutex] |
1617 | lea ecx, [ebx + SOCKET.mutex] |
1619 | call mutex_unlock |
1618 | call mutex_unlock |
1620 | pop edx ebx |
1619 | pop edx ebx |
1621 | 1620 | ||
1622 | test [edx + TCP_header.Flags], TH_RST |
1621 | test [edx + TCP_header.Flags], TH_RST |
1623 | jnz .done |
1622 | jnz .done |
1624 | 1623 | ||
1625 | ;;; if its a multicast/broadcast, also drop |
1624 | ;;; if its a multicast/broadcast, also drop |
1626 | 1625 | ||
1627 | test [edx + TCP_header.Flags], TH_ACK |
1626 | test [edx + TCP_header.Flags], TH_ACK |
1628 | jnz .respond_ack |
1627 | jnz .respond_ack |
1629 | 1628 | ||
1630 | test [edx + TCP_header.Flags], TH_SYN |
1629 | test [edx + TCP_header.Flags], TH_SYN |
1631 | jnz .respond_syn |
1630 | jnz .respond_syn |
1632 | jmp .done |
1631 | jmp .done |
1633 | 1632 | ||
1634 | ;--------- |
1633 | ;--------- |
1635 | ; Respond |
1634 | ; Respond |
1636 | 1635 | ||
1637 | .respond_ack: |
1636 | .respond_ack: |
1638 | push ebx |
1637 | push ebx |
1639 | mov cl, TH_RST |
1638 | mov cl, TH_RST |
1640 | call TCP_respond |
1639 | call TCP_respond |
1641 | pop ebx |
1640 | pop ebx |
1642 | jmp .destroy_new_socket |
1641 | jmp .destroy_new_socket |
1643 | 1642 | ||
1644 | .respond_syn: |
1643 | .respond_syn: |
1645 | push ebx |
1644 | push ebx |
1646 | mov cl, TH_RST + TH_ACK |
1645 | mov cl, TH_RST + TH_ACK |
1647 | call TCP_respond |
1646 | call TCP_respond |
1648 | pop ebx |
1647 | pop ebx |
1649 | jmp .destroy_new_socket |
1648 | jmp .destroy_new_socket |
1650 | 1649 | ||
1651 | ;----------------------------------------- |
1650 | ;----------------------------------------- |
1652 | ; The connection has no associated socket |
1651 | ; The connection has no associated socket |
1653 | 1652 | ||
1654 | .no_socket: |
1653 | .no_socket: |
1655 | pusha |
1654 | pusha |
1656 | mov ecx, socket_mutex |
1655 | mov ecx, socket_mutex |
1657 | call mutex_unlock |
1656 | call mutex_unlock |
1658 | popa |
1657 | popa |
1659 | 1658 | ||
1660 | .respond_seg_reset: |
1659 | .respond_seg_reset: |
1661 | test [edx + TCP_header.Flags], TH_RST |
1660 | test [edx + TCP_header.Flags], TH_RST |
1662 | jnz .drop_no_socket |
1661 | jnz .drop_no_socket |
1663 | 1662 | ||
1664 | ;;; TODO: if its a multicast/broadcast, also drop |
1663 | ;;; TODO: if its a multicast/broadcast, also drop |
1665 | 1664 | ||
1666 | test [edx + TCP_header.Flags], TH_ACK |
1665 | test [edx + TCP_header.Flags], TH_ACK |
1667 | jnz .respond_seg_ack |
1666 | jnz .respond_seg_ack |
1668 | 1667 | ||
1669 | test [edx + TCP_header.Flags], TH_SYN |
1668 | test [edx + TCP_header.Flags], TH_SYN |
1670 | jnz .respond_seg_syn |
1669 | jnz .respond_seg_syn |
1671 | 1670 | ||
1672 | jmp .drop_no_socket |
1671 | jmp .drop_no_socket |
1673 | 1672 | ||
1674 | .respond_seg_ack: |
1673 | .respond_seg_ack: |
1675 | mov cl, TH_RST |
1674 | mov cl, TH_RST |
- | 1675 | xor ebx, ebx ; FIXME: find a way to get the receiving device ptr |
|
1676 | call TCP_respond_segment |
1676 | call TCP_respond_segment |
1677 | jmp .drop_no_socket |
1677 | jmp .drop_no_socket |
1678 | 1678 | ||
1679 | .respond_seg_syn: |
1679 | .respond_seg_syn: |
1680 | mov cl, TH_RST + TH_ACK |
1680 | mov cl, TH_RST + TH_ACK |
- | 1681 | xor ebx, ebx ; FIXME: find a way to get the receiving device ptr |
|
1681 | call TCP_respond_segment |
1682 | call TCP_respond_segment |
1682 | jmp .drop_no_socket |
1683 | jmp .drop_no_socket |
1683 | 1684 | ||
1684 | ;------------------------------------------------ |
1685 | ;------------------------------------------------ |
1685 | ; Unlock socket mutex and prepare to drop segment |
1686 | ; Unlock socket mutex and prepare to drop segment |
1686 | 1687 | ||
1687 | .drop: |
1688 | .drop: |
1688 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Dropping segment\n" |
1689 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Dropping segment\n" |
1689 | 1690 | ||
1690 | pusha |
1691 | pusha |
1691 | lea ecx, [ebx + SOCKET.mutex] |
1692 | lea ecx, [ebx + SOCKET.mutex] |
1692 | call mutex_unlock |
1693 | call mutex_unlock |
1693 | popa |
1694 | popa |
1694 | 1695 | ||
1695 | ;-------------------------------------------- |
1696 | ;-------------------------------------------- |
1696 | ; Destroy the newly created socket if needed |
1697 | ; Destroy the newly created socket if needed |
1697 | 1698 | ||
1698 | .destroy_new_socket: |
1699 | .destroy_new_socket: |
1699 | test [temp_bits], TCP_BIT_DROPSOCKET |
1700 | test [temp_bits], TCP_BIT_DROPSOCKET |
1700 | jz .drop_no_socket |
1701 | jz .drop_no_socket |
1701 | 1702 | ||
1702 | mov eax, ebx |
1703 | mov eax, ebx |
1703 | call SOCKET_free |
1704 | call SOCKET_free |
1704 | 1705 | ||
1705 | ;------------------ |
1706 | ;------------------ |
1706 | ; Drop the segment |
1707 | ; Drop the segment |
1707 | 1708 | ||
1708 | .drop_no_socket: |
1709 | .drop_no_socket: |
1709 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Drop (no socket)\n" |
1710 | DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Drop (no socket)\n" |
1710 | 1711 | ||
1711 | call NET_BUFF_free |
1712 | call NET_BUFF_free |
1712 | jmp .loop |
1713 | jmp .loop |
1713 | 1714 | ||
1714 | endp |
1715 | endp |
1715 | >< |
1716 | >< |
1716 | ><< |
1717 | ><< |
1717 | ><<< |
1718 | ><<< |
1718 | > |
1719 | > |