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1763 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3251 | hidnplayr | 3 | ;; Copyright (C) KolibriOS team 2004-2013. All rights reserved. ;; |
1763 | hidnplayr | 4 | ;; Distributed under terms of the GNU General Public License ;; |
5 | ;; ;; |
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3143 | hidnplayr | 6 | ;; Part of the TCP/IP network stack for KolibriOS ;; |
1763 | hidnplayr | 7 | ;; ;; |
8 | ;; Written by hidnplayr@kolibrios.org ;; |
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9 | ;; ;; |
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10 | ;; Based on the code of 4.4BSD ;; |
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11 | ;; ;; |
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12 | ;; GNU GENERAL PUBLIC LICENSE ;; |
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13 | ;; Version 2, June 1991 ;; |
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14 | ;; ;; |
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15 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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16 | |||
17 | $Revision: 3257 $ |
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18 | |||
1733 | hidnplayr | 19 | ;----------------------------------------------------------------- |
20 | ; |
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21 | ; TCP_input: |
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22 | ; |
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3251 | hidnplayr | 23 | ; Add a segment to the incoming TCP queue |
24 | ; |
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1733 | hidnplayr | 25 | ; IN: [esp] = ptr to buffer |
3252 | hidnplayr | 26 | ; [esp+4] = buffer size (dont care) |
1733 | hidnplayr | 27 | ; ebx = ptr to device struct |
28 | ; ecx = segment size |
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2310 | hidnplayr | 29 | ; esi = ptr to TCP segment |
2308 | hidnplayr | 30 | ; edi = ptr to ipv4 source address, followed by ipv4 dest address |
1733 | hidnplayr | 31 | ; |
32 | ; OUT: / |
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33 | ; |
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34 | ;----------------------------------------------------------------- |
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1830 | hidnplayr | 35 | |
1733 | hidnplayr | 36 | align 4 |
37 | TCP_input: |
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38 | |||
3252 | hidnplayr | 39 | ; record the current time |
40 | mov eax, [timer_ticks] ; in 1/100 seconds |
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41 | mov [esp + 4], eax |
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42 | |||
3251 | hidnplayr | 43 | push ebx ecx esi edi ; mind the order |
44 | mov esi, esp |
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45 | |||
46 | pushf |
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2942 | hidnplayr | 47 | cli |
3251 | hidnplayr | 48 | add_to_queue TCP_queue, TCP_QUEUE_SIZE, sizeof.TCP_queue_entry, .fail |
49 | popf |
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50 | |||
51 | add esp, sizeof.TCP_queue_entry |
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52 | ret |
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53 | |||
54 | .fail: |
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55 | DEBUGF 2, "TCP incoming queue is full, discarding packet!\n" |
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56 | |||
57 | add esp, sizeof.TCP_queue_entry - 8 |
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58 | call kernel_free |
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59 | add esp, 4 |
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60 | .done: |
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61 | ret |
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62 | |||
63 | |||
64 | |||
65 | align 4 |
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66 | TCP_process_input: |
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67 | |||
68 | .loop: |
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69 | get_from_queue TCP_queue, TCP_QUEUE_SIZE, sizeof.TCP_queue_entry, TCP_input.done |
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70 | |||
71 | push .loop |
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72 | push [esi + TCP_queue_entry.buffer_size] |
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73 | push [esi + TCP_queue_entry.buffer_ptr] |
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74 | |||
75 | mov ebx, [esi + TCP_queue_entry.device_ptr] |
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76 | mov ecx, [esi + TCP_queue_entry.segment_size] |
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77 | mov edi, [esi + TCP_queue_entry.ip_ptr] |
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78 | mov esi, [esi + TCP_queue_entry.segment_ptr] ; change esi last |
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79 | |||
80 | ;----------------------------------------------------------------- |
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81 | ; |
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82 | ; IN: [esp] = ptr to buffer |
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3252 | hidnplayr | 83 | ; [esp+4] = timestamp when segment was received |
3251 | hidnplayr | 84 | ; ebx = ptr to device struct |
85 | ; ecx = segment size |
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86 | ; esi = ptr to TCP segment |
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87 | ; edi = ptr to ipv4 source address, followed by ipv4 dest address |
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88 | ; |
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89 | ; OUT: / |
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90 | ; |
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91 | ;----------------------------------------------------------------- |
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92 | |||
2957 | hidnplayr | 93 | DEBUGF 1,"TCP_input: size=%u time=%d\n", ecx, [timer_ticks] |
1733 | hidnplayr | 94 | |
3252 | hidnplayr | 95 | ; re-calculate the checksum (if not already done by hw) |
2930 | hidnplayr | 96 | ; test [ebx + NET_DEVICE.hwacc], HWACC_TCP_IPv4_IN |
97 | ; jnz .checksum_ok |
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98 | |||
2390 | hidnplayr | 99 | push ecx esi |
100 | pushw [esi + TCP_header.Checksum] |
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101 | mov [esi + TCP_header.Checksum], 0 |
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102 | TCP_checksum (edi), (edi+4) |
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2937 | hidnplayr | 103 | pop cx ; previous checksum |
2390 | hidnplayr | 104 | cmp cx, dx |
105 | pop edx ecx |
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2600 | hidnplayr | 106 | jne .drop_no_socket |
2930 | hidnplayr | 107 | .checksum_ok: |
1733 | hidnplayr | 108 | |
2930 | hidnplayr | 109 | ; Verify the data offset |
2390 | hidnplayr | 110 | and [edx + TCP_header.DataOffset], 0xf0 ; Calculate TCP segment header size (throwing away unused reserved bits in TCP header) |
111 | shr [edx + TCP_header.DataOffset], 2 |
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112 | cmp [edx + TCP_header.DataOffset], sizeof.TCP_header ; Now see if it's at least the size of a standard TCP header |
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2600 | hidnplayr | 113 | jb .drop_no_socket ; If not, drop the packet |
1733 | hidnplayr | 114 | |
2390 | hidnplayr | 115 | movzx eax, [edx + TCP_header.DataOffset] |
116 | sub ecx, eax ; substract TCP header size from total segment size |
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2600 | hidnplayr | 117 | jb .drop_no_socket ; If total segment size is less then the advertised header size, drop packet |
2891 | hidnplayr | 118 | DEBUGF 1,"TCP_input: %u bytes of data\n", ecx |
1733 | hidnplayr | 119 | |
120 | ;------------------------------------------- |
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121 | ; Convert Big-endian values to little endian |
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122 | |||
2390 | hidnplayr | 123 | ntohd [edx + TCP_header.SequenceNumber] |
124 | ntohd [edx + TCP_header.AckNumber] |
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1733 | hidnplayr | 125 | |
2390 | hidnplayr | 126 | ntohw [edx + TCP_header.Window] |
127 | ntohw [edx + TCP_header.UrgentPointer] |
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1733 | hidnplayr | 128 | |
2930 | hidnplayr | 129 | ;------------------------ |
130 | ; Find the socket pointer |
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1733 | hidnplayr | 131 | |
132 | ; IP Packet TCP Destination Port = local Port |
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133 | ; (IP Packet SenderAddress = Remote IP) OR (Remote IP = 0) |
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2309 | hidnplayr | 134 | ; (IP Packet TCP Source Port = remote Port) OR (remote Port = 0) |
1733 | hidnplayr | 135 | |
2937 | hidnplayr | 136 | .findpcb: |
2390 | hidnplayr | 137 | mov ebx, net_sockets |
138 | mov si, [edx + TCP_header.DestinationPort] |
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1733 | hidnplayr | 139 | |
140 | .socket_loop: |
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2390 | hidnplayr | 141 | mov ebx, [ebx + SOCKET.NextPtr] |
142 | or ebx, ebx |
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2600 | hidnplayr | 143 | jz .drop_with_reset_no_socket |
1733 | hidnplayr | 144 | |
2390 | hidnplayr | 145 | cmp [ebx + SOCKET.Domain], AF_INET4 |
146 | jne .socket_loop |
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1733 | hidnplayr | 147 | |
2390 | hidnplayr | 148 | cmp [ebx + SOCKET.Protocol], IP_PROTO_TCP |
149 | jne .socket_loop |
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1733 | hidnplayr | 150 | |
2390 | hidnplayr | 151 | cmp [ebx + TCP_SOCKET.LocalPort], si |
152 | jne .socket_loop |
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1733 | hidnplayr | 153 | |
2390 | hidnplayr | 154 | mov eax, [ebx + IP_SOCKET.RemoteIP] |
155 | cmp eax, [edi] ; Ipv4 source addres |
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156 | je @f |
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157 | test eax, eax |
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158 | jnz .socket_loop |
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1733 | hidnplayr | 159 | @@: |
160 | |||
2390 | hidnplayr | 161 | mov ax, [ebx + TCP_SOCKET.RemotePort] |
162 | cmp [edx + TCP_header.SourcePort], ax |
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163 | je .found_socket |
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164 | test ax, ax |
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165 | jnz .socket_loop |
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166 | .found_socket: ; ebx now contains the socketpointer |
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2891 | hidnplayr | 167 | DEBUGF 1,"TCP_input: socket ptr=%x state=%u flags=%x\n", ebx, [ebx + TCP_SOCKET.t_state], [edx + TCP_header.Flags]:2 |
1733 | hidnplayr | 168 | |
2930 | hidnplayr | 169 | ;------------- |
2890 | hidnplayr | 170 | ; update stats |
2930 | hidnplayr | 171 | |
2890 | hidnplayr | 172 | inc [TCP_segments_rx] ; FIXME: correct interface? |
1733 | hidnplayr | 173 | |
174 | ;---------------------------- |
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175 | ; Check if socket isnt closed |
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176 | |||
2390 | hidnplayr | 177 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
2937 | hidnplayr | 178 | je .drop_no_socket |
1733 | hidnplayr | 179 | |
180 | ;---------------- |
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181 | ; Lock the socket |
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182 | |||
2402 | hidnplayr | 183 | pusha |
184 | lea ecx, [ebx + SOCKET.mutex] |
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185 | call mutex_lock |
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186 | popa |
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1830 | hidnplayr | 187 | |
2891 | hidnplayr | 188 | DEBUGF 1,"TCP_input: socket locked\n" |
1733 | hidnplayr | 189 | |
2937 | hidnplayr | 190 | ;--------------------------- |
191 | ; disable all temporary bits |
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2891 | hidnplayr | 192 | |
2937 | hidnplayr | 193 | mov [ebx + TCP_SOCKET.temp_bits], 0 |
2891 | hidnplayr | 194 | |
1733 | hidnplayr | 195 | ;--------------------------------------- |
196 | ; unscale the window into a 32 bit value |
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197 | |||
2390 | hidnplayr | 198 | movzx eax, [edx + TCP_header.Window] |
199 | push ecx |
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200 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
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201 | shl eax, cl |
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202 | mov dword [edx + TCP_header.Window], eax ; word after window is checksum, we dont need checksum anymore |
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203 | pop ecx |
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1733 | hidnplayr | 204 | |
2930 | hidnplayr | 205 | ;--------------------------------------- |
206 | ; Are we accepting incoming connections? |
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1733 | hidnplayr | 207 | |
2390 | hidnplayr | 208 | test [ebx + SOCKET.options], SO_ACCEPTCON |
2954 | hidnplayr | 209 | jz .no_accept |
1733 | hidnplayr | 210 | |
2954 | hidnplayr | 211 | DEBUGF 1,"TCP_input: Accepting new connection\n" |
212 | |||
213 | pusha |
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214 | lea ecx, [ebx + SOCKET.mutex] |
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215 | call mutex_unlock |
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216 | popa |
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217 | |||
218 | push ecx edx esi edi ;;; |
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219 | call SOCKET_fork |
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220 | pop edi esi edx ecx |
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221 | |||
222 | test eax, eax |
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223 | jz .drop_no_socket |
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224 | |||
225 | mov ebx, eax |
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226 | |||
227 | mov [ebx + TCP_SOCKET.temp_bits], TCP_BIT_DROPSOCKET ;;; FIXME: should we take over bits from previous socket? |
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228 | |||
229 | push dword [edi + 4] ; Ipv4 destination addres |
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230 | pop [ebx + IP_SOCKET.LocalIP] |
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231 | |||
232 | push [edx + TCP_header.DestinationPort] |
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233 | pop [ebx + TCP_SOCKET.LocalPort] |
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234 | |||
235 | mov [ebx + TCP_SOCKET.t_state], TCPS_LISTEN |
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236 | .no_accept: |
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237 | |||
238 | |||
1733 | hidnplayr | 239 | ;------------------------------------- |
240 | ; Reset idle timer and keepalive timer |
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241 | |||
2390 | hidnplayr | 242 | mov [ebx + TCP_SOCKET.t_idle], 0 |
3143 | hidnplayr | 243 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_idle |
1733 | hidnplayr | 244 | |
245 | ;-------------------- |
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246 | ; Process TCP options |
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247 | |||
3252 | hidnplayr | 248 | push ecx ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2954 | hidnplayr | 249 | |
250 | movzx ecx, [edx + TCP_header.DataOffset] |
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251 | cmp ecx, sizeof.TCP_header ; Does header contain any options? |
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2390 | hidnplayr | 252 | je .no_options |
1733 | hidnplayr | 253 | |
2891 | hidnplayr | 254 | DEBUGF 1,"TCP_input: Segment has options\n" |
1733 | hidnplayr | 255 | |
2954 | hidnplayr | 256 | ;;; FIXME: for LISTEN, options should be called after we determined route, we need it for MSS |
257 | ;;; cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN ; no options when in listen state |
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258 | ;;; jz .not_uni_xfer ; also no header prediction |
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1733 | hidnplayr | 259 | |
2954 | hidnplayr | 260 | add ecx, edx |
2390 | hidnplayr | 261 | lea esi, [edx + sizeof.TCP_header] |
1733 | hidnplayr | 262 | |
263 | .opt_loop: |
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2954 | hidnplayr | 264 | cmp esi, ecx ; are we scanning outside of header? |
2390 | hidnplayr | 265 | jae .no_options |
2954 | hidnplayr | 266 | lodsb |
267 | cmp al, TCP_OPT_EOL ; end of option list? |
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268 | je .no_options |
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269 | cmp al, TCP_OPT_NOP |
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270 | je .opt_loop |
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271 | cmp al, TCP_OPT_MAXSEG |
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2390 | hidnplayr | 272 | je .opt_maxseg |
2954 | hidnplayr | 273 | cmp al, TCP_OPT_WINDOW |
2390 | hidnplayr | 274 | je .opt_window |
2954 | hidnplayr | 275 | cmp al, TCP_OPT_SACK_PERMIT |
276 | je .opt_sack_permit |
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277 | ; cmp al, TCP_OPT_SACK |
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278 | ; je .opt_sack |
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279 | cmp al, TCP_OPT_TIMESTAMP |
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2390 | hidnplayr | 280 | je .opt_timestamp |
2954 | hidnplayr | 281 | DEBUGF 1,"TCP_input: unknown option:%u\n", al |
2937 | hidnplayr | 282 | jmp .no_options ; If we reach here, some unknown options were received, skip them all! |
1733 | hidnplayr | 283 | |
284 | .opt_maxseg: |
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2954 | hidnplayr | 285 | lodsb |
286 | cmp al, 4 |
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2937 | hidnplayr | 287 | jne .no_options ; error occured, ignore all options! |
1733 | hidnplayr | 288 | |
2390 | hidnplayr | 289 | test [edx + TCP_header.Flags], TH_SYN |
290 | jz @f |
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1733 | hidnplayr | 291 | |
2954 | hidnplayr | 292 | lodsw |
2390 | hidnplayr | 293 | rol ax, 8 |
2891 | hidnplayr | 294 | DEBUGF 1,"TCP_input: Maxseg=%u\n", ax |
3144 | hidnplayr | 295 | call TCP_mss |
1733 | hidnplayr | 296 | @@: |
2390 | hidnplayr | 297 | jmp .opt_loop |
1733 | hidnplayr | 298 | |
299 | |||
300 | .opt_window: |
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2954 | hidnplayr | 301 | lodsb |
302 | cmp al, 3 |
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2390 | hidnplayr | 303 | jne .no_options |
1733 | hidnplayr | 304 | |
2390 | hidnplayr | 305 | test [edx + TCP_header.Flags], TH_SYN |
306 | jz @f |
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1733 | hidnplayr | 307 | |
2954 | hidnplayr | 308 | DEBUGF 1,"TCP_input: Got window scale option\n" |
309 | or [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
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1733 | hidnplayr | 310 | |
2954 | hidnplayr | 311 | lodsb |
312 | mov [ebx + TCP_SOCKET.SND_SCALE], al |
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313 | ;;;;; TODO |
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314 | |||
1733 | hidnplayr | 315 | @@: |
2390 | hidnplayr | 316 | jmp .opt_loop |
1733 | hidnplayr | 317 | |
318 | |||
2954 | hidnplayr | 319 | .opt_sack_permit: |
320 | lodsb |
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321 | cmp al, 2 |
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322 | jne .no_options |
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323 | |||
324 | test [edx + TCP_header.Flags], TH_SYN |
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325 | jz @f |
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326 | |||
327 | DEBUGF 1,"TCP_input: Selective Acknowledgement permitted\n" |
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328 | or [ebx + TCP_SOCKET.t_flags], TF_SACK_PERMIT |
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329 | |||
330 | @@: |
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331 | jmp .opt_loop |
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332 | |||
333 | |||
1733 | hidnplayr | 334 | .opt_timestamp: |
2954 | hidnplayr | 335 | lodsb |
336 | cmp al, 10 ; length must be 10 |
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2390 | hidnplayr | 337 | jne .no_options |
1733 | hidnplayr | 338 | |
2891 | hidnplayr | 339 | DEBUGF 1,"TCP_input: Got timestamp option\n" |
1733 | hidnplayr | 340 | |
2954 | hidnplayr | 341 | test [edx + TCP_header.Flags], TH_SYN |
342 | jz @f |
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343 | or [ebx + TCP_SOCKET.t_flags], TF_RCVD_TSTMP |
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344 | @@: |
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345 | |||
346 | lodsd |
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347 | mov [ebx + TCP_SOCKET.ts_val], eax |
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348 | lodsd ; timestamp echo reply |
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349 | mov [ebx + TCP_SOCKET.ts_ecr], eax |
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2937 | hidnplayr | 350 | or [ebx + TCP_SOCKET.temp_bits], TCP_BIT_TIMESTAMP |
2930 | hidnplayr | 351 | |
2946 | hidnplayr | 352 | ; Since we have a timestamp, lets do the paws test right away! |
353 | |||
354 | test [edx + TCP_header.Flags], TH_RST |
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355 | jnz .no_paws |
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356 | |||
357 | mov eax, [ebx + TCP_SOCKET.ts_recent] |
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358 | test eax, eax |
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359 | jz .no_paws |
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360 | cmp eax, [ebx + TCP_SOCKET.ts_val] |
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361 | jge .no_paws |
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362 | |||
363 | DEBUGF 1,"TCP_input: PAWS: detected an old segment\n" |
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364 | |||
3251 | hidnplayr | 365 | mov eax, [esp+4+4] ; tcp_now |
2946 | hidnplayr | 366 | sub eax, [ebx + TCP_SOCKET.ts_recent_age] |
3252 | hidnplayr | 367 | |
368 | pop ecx |
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2946 | hidnplayr | 369 | cmp eax, TCP_PAWS_IDLE |
2947 | hidnplayr | 370 | jle .drop_after_ack ; TODO: update stats |
3252 | hidnplayr | 371 | push ecx |
2946 | hidnplayr | 372 | |
373 | mov [ebx + TCP_SOCKET.ts_recent], 0 ; timestamp was invalid, fix it. |
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374 | .no_paws: |
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2390 | hidnplayr | 375 | jmp .opt_loop |
1733 | hidnplayr | 376 | |
377 | .no_options: |
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378 | |||
3252 | hidnplayr | 379 | pop ecx;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2954 | hidnplayr | 380 | |
1733 | hidnplayr | 381 | ;----------------------------------------------------------------------- |
382 | ; Time to do some header prediction (Original Principle by Van Jacobson) |
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383 | |||
384 | ; There are two common cases for an uni-directional data transfer. |
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385 | ; |
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386 | ; General rule: the packets has no control flags, is in-sequence, |
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387 | ; window width didnt change and we're not retransmitting. |
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388 | ; |
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389 | ; Second rules: |
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390 | ; - If the length is 0 and the ACK moved forward, we're the sender side of the transfer. |
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391 | ; In this case we'll free the ACK'ed data and notify higher levels that we have free space in buffer |
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392 | ; |
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393 | ; - If the length is not 0 and the ACK didn't move, we're the receiver side of the transfer. |
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394 | ; If the packets are in order (data queue is empty), add the data to the socket buffer and request a delayed ACK |
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395 | |||
2390 | hidnplayr | 396 | cmp [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
397 | jnz .not_uni_xfer |
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1733 | hidnplayr | 398 | |
2390 | hidnplayr | 399 | test [edx + TCP_header.Flags], TH_SYN + TH_FIN + TH_RST + TH_URG |
400 | jnz .not_uni_xfer |
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1733 | hidnplayr | 401 | |
2390 | hidnplayr | 402 | test [edx + TCP_header.Flags], TH_ACK |
403 | jz .not_uni_xfer |
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1733 | hidnplayr | 404 | |
2390 | hidnplayr | 405 | mov eax, [edx + TCP_header.SequenceNumber] |
406 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
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407 | jne .not_uni_xfer |
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1733 | hidnplayr | 408 | |
2390 | hidnplayr | 409 | mov eax, dword [edx + TCP_header.Window] |
410 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
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411 | jne .not_uni_xfer |
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1733 | hidnplayr | 412 | |
2390 | hidnplayr | 413 | mov eax, [ebx + TCP_SOCKET.SND_NXT] |
414 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
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415 | jne .not_uni_xfer |
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1733 | hidnplayr | 416 | |
417 | ;--------------------------------------- |
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418 | ; check if we are sender in the uni-xfer |
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419 | |||
420 | ; If the following 4 conditions are all true, this segment is a pure ACK. |
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421 | ; |
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422 | ; - The segment contains no data. |
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2390 | hidnplayr | 423 | test ecx, ecx |
424 | jnz .not_sender |
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1733 | hidnplayr | 425 | |
426 | ; - The congestion window is greater than or equal to the current send window. |
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427 | ; This test is true only if the window is fully open, that is, the connection is not in the middle of slow start or congestion avoidance. |
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2390 | hidnplayr | 428 | mov eax, [ebx + TCP_SOCKET.SND_CWND] |
429 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
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430 | jb .not_uni_xfer |
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1733 | hidnplayr | 431 | |
432 | ; - The acknowledgment field in the segment is less than or equal to the maximum sequence number sent. |
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2390 | hidnplayr | 433 | mov eax, [edx + TCP_header.AckNumber] |
434 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
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435 | ja .not_uni_xfer |
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1733 | hidnplayr | 436 | |
437 | ; - The acknowledgment field in the segment is greater than the largest unacknowledged sequence number. |
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2390 | hidnplayr | 438 | sub eax, [ebx + TCP_SOCKET.SND_UNA] |
439 | jbe .not_uni_xfer |
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1733 | hidnplayr | 440 | |
2891 | hidnplayr | 441 | DEBUGF 1,"TCP_input: Header prediction: we are sender\n" |
1733 | hidnplayr | 442 | |
443 | ;--------------------------------- |
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444 | ; Packet is a pure ACK, process it |
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445 | |||
446 | ; Delete acknowledged bytes from send buffer |
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2390 | hidnplayr | 447 | pusha |
448 | mov ecx, eax |
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449 | lea eax, [ebx + STREAM_SOCKET.snd] |
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450 | call SOCKET_ring_free |
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451 | popa |
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1733 | hidnplayr | 452 | |
2930 | hidnplayr | 453 | ; Update RTT estimators |
454 | |||
2937 | hidnplayr | 455 | test [ebx + TCP_SOCKET.temp_bits], TCP_BIT_TIMESTAMP |
456 | jz .no_timestamp_rtt |
||
3251 | hidnplayr | 457 | mov eax, [esp + 4] ; timestamp when this segment was received |
2937 | hidnplayr | 458 | sub eax, [ebx + TCP_SOCKET.ts_ecr] |
459 | inc eax |
||
460 | call TCP_xmit_timer |
||
461 | jmp .rtt_done |
||
2930 | hidnplayr | 462 | |
2937 | hidnplayr | 463 | .no_timestamp_rtt: |
464 | cmp [ebx + TCP_SOCKET.t_rtt], 0 |
||
465 | je .rtt_done |
||
466 | mov eax, [edx + TCP_header.AckNumber] |
||
467 | cmp eax, [ebx + TCP_SOCKET.t_rtseq] |
||
468 | jbe .rtt_done |
||
469 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
||
470 | call TCP_xmit_timer |
||
2930 | hidnplayr | 471 | |
2937 | hidnplayr | 472 | .rtt_done: |
473 | |||
1733 | hidnplayr | 474 | ; update window pointers |
2390 | hidnplayr | 475 | mov eax, [edx + TCP_header.AckNumber] |
476 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
1733 | hidnplayr | 477 | |
478 | ; Stop retransmit timer |
||
2390 | hidnplayr | 479 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 |
1733 | hidnplayr | 480 | |
481 | ; Awaken waiting processes |
||
2402 | hidnplayr | 482 | pusha |
483 | lea ecx, [ebx + SOCKET.mutex] |
||
484 | call mutex_unlock |
||
485 | popa |
||
486 | |||
2390 | hidnplayr | 487 | mov eax, ebx |
3257 | hidnplayr | 488 | call SOCKET_notify |
1733 | hidnplayr | 489 | |
1763 | hidnplayr | 490 | ; Generate more output |
2390 | hidnplayr | 491 | call TCP_output |
1733 | hidnplayr | 492 | |
2937 | hidnplayr | 493 | jmp .drop_no_socket |
1763 | hidnplayr | 494 | |
1733 | hidnplayr | 495 | ;------------------------------------------------- |
496 | ; maybe we are the receiver in the uni-xfer then.. |
||
497 | |||
498 | .not_sender: |
||
499 | ; - The amount of data in the segment is greater than 0 (data count is in ecx) |
||
500 | |||
501 | ; - The acknowledgment field equals the largest unacknowledged sequence number. This means no data is acknowledged by this segment. |
||
2390 | hidnplayr | 502 | mov eax, [edx + TCP_header.AckNumber] |
503 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
504 | jne .not_uni_xfer |
||
1733 | hidnplayr | 505 | |
506 | ; - The reassembly list of out-of-order segments for the connection is empty (seg_next equals tp). |
||
507 | |||
508 | ;;; TODO |
||
509 | |||
2930 | hidnplayr | 510 | ; jnz .not_uni_xfer |
1733 | hidnplayr | 511 | |
512 | ; Complete processing of received data |
||
513 | |||
2891 | hidnplayr | 514 | DEBUGF 1,"TCP_input: Header prediction: we are receiving %u bytes\n", ecx |
1733 | hidnplayr | 515 | |
2390 | hidnplayr | 516 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
1763 | hidnplayr | 517 | |
2390 | hidnplayr | 518 | movzx esi, [edx + TCP_header.DataOffset] |
519 | add esi, edx |
||
520 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
521 | call SOCKET_ring_write ; Add the data to the socket buffer |
||
1733 | hidnplayr | 522 | |
2390 | hidnplayr | 523 | mov eax, ebx |
3257 | hidnplayr | 524 | call SOCKET_notify |
1733 | hidnplayr | 525 | |
2390 | hidnplayr | 526 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK ; Set delayed ack flag |
1733 | hidnplayr | 527 | |
2390 | hidnplayr | 528 | jmp .drop |
1733 | hidnplayr | 529 | |
530 | |||
531 | |||
532 | |||
533 | |||
534 | |||
535 | ;-------------------------------------------------- |
||
536 | ; Header prediction failed, do it the slow way |
||
537 | |||
538 | .not_uni_xfer: |
||
539 | |||
2891 | hidnplayr | 540 | DEBUGF 1,"TCP_input: Header prediction failed\n" |
1733 | hidnplayr | 541 | |
542 | ; Calculate receive window size |
||
543 | |||
2942 | hidnplayr | 544 | push edx |
2937 | hidnplayr | 545 | mov eax, SOCKETBUFFSIZE |
546 | sub eax, [ebx + STREAM_SOCKET.rcv.size] |
||
547 | mov edx, [ebx + TCP_SOCKET.RCV_ADV] |
||
548 | sub edx, [ebx + TCP_SOCKET.RCV_NXT] |
||
549 | cmp eax, edx |
||
2942 | hidnplayr | 550 | jg @f |
2937 | hidnplayr | 551 | mov eax, edx |
552 | @@: |
||
2957 | hidnplayr | 553 | DEBUGF 1,"Receive window size=%d\n", eax |
554 | mov [ebx + TCP_SOCKET.RCV_WND], eax |
||
2942 | hidnplayr | 555 | pop edx |
1733 | hidnplayr | 556 | |
2937 | hidnplayr | 557 | ; If listen or Syn sent, go to that specific code right away |
558 | |||
2390 | hidnplayr | 559 | cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN |
560 | je .LISTEN |
||
1733 | hidnplayr | 561 | |
2390 | hidnplayr | 562 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_SENT |
563 | je .SYN_SENT |
||
1733 | hidnplayr | 564 | |
2891 | hidnplayr | 565 | DEBUGF 1,"TCP_input: state is not listen or syn_sent\n" |
1733 | hidnplayr | 566 | |
567 | ;---------------------------- |
||
568 | ; trim any data not in window |
||
569 | |||
570 | ; check for duplicate data at beginning of segment |
||
571 | |||
2390 | hidnplayr | 572 | mov eax, [ebx + TCP_SOCKET.RCV_NXT] |
573 | sub eax, [edx + TCP_header.SequenceNumber] |
||
2942 | hidnplayr | 574 | jle .no_duplicate |
1733 | hidnplayr | 575 | |
2891 | hidnplayr | 576 | DEBUGF 1,"TCP_input: %u bytes duplicate data!\n", eax |
1763 | hidnplayr | 577 | |
2390 | hidnplayr | 578 | test [edx + TCP_header.Flags], TH_SYN |
579 | jz .no_dup_syn |
||
1733 | hidnplayr | 580 | |
2942 | hidnplayr | 581 | DEBUGF 1,"TCP_input: got duplicate syn\n" |
1733 | hidnplayr | 582 | |
2390 | hidnplayr | 583 | and [edx + TCP_header.Flags], not (TH_SYN) |
584 | inc [edx + TCP_header.SequenceNumber] |
||
1733 | hidnplayr | 585 | |
2390 | hidnplayr | 586 | cmp [edx + TCP_header.UrgentPointer], 1 |
587 | jbe @f |
||
588 | dec [edx + TCP_header.UrgentPointer] |
||
589 | jmp .dup_syn |
||
1733 | hidnplayr | 590 | @@: |
2390 | hidnplayr | 591 | and [edx + TCP_header.Flags], not (TH_URG) |
1838 | hidnplayr | 592 | .dup_syn: |
2390 | hidnplayr | 593 | dec eax |
1763 | hidnplayr | 594 | .no_dup_syn: |
1733 | hidnplayr | 595 | |
2937 | hidnplayr | 596 | ; Check for entire duplicate segment |
597 | cmp eax, ecx ; eax holds number of bytes to drop, ecx is data size |
||
598 | jb .duplicate |
||
599 | jnz @f |
||
2390 | hidnplayr | 600 | test [edx + TCP_header.Flags], TH_FIN |
2937 | hidnplayr | 601 | jnz .duplicate |
602 | @@: |
||
1733 | hidnplayr | 603 | |
2937 | hidnplayr | 604 | ; Any valid FIN must be to the left of the window. |
605 | ; At this point the FIN must be out of sequence or a duplicate, drop it |
||
2390 | hidnplayr | 606 | and [edx + TCP_header.Flags], not TH_FIN |
2937 | hidnplayr | 607 | |
608 | ; send an ACK and resynchronize and drop any data. |
||
609 | ; But keep on processing for RST or ACK |
||
2390 | hidnplayr | 610 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
2937 | hidnplayr | 611 | mov eax, ecx |
612 | ;TODO: update stats |
||
1733 | hidnplayr | 613 | |
614 | ;----------------------------------------------- |
||
615 | ; Remove duplicate data and update urgent offset |
||
616 | |||
2937 | hidnplayr | 617 | .duplicate: |
618 | ;;; TODO: 677 |
||
2390 | hidnplayr | 619 | add [edx + TCP_header.SequenceNumber], eax |
2937 | hidnplayr | 620 | sub ecx, eax |
1733 | hidnplayr | 621 | |
2390 | hidnplayr | 622 | sub [edx + TCP_header.UrgentPointer], ax |
2942 | hidnplayr | 623 | jg @f |
2390 | hidnplayr | 624 | and [edx + TCP_header.Flags], not (TH_URG) |
625 | mov [edx + TCP_header.UrgentPointer], 0 |
||
1733 | hidnplayr | 626 | @@: |
627 | |||
628 | ;-------------------------------------------------- |
||
629 | ; Handle data that arrives after process terminates |
||
630 | |||
2937 | hidnplayr | 631 | .no_duplicate: |
2390 | hidnplayr | 632 | cmp [ebx + SOCKET.PID], 0 |
2937 | hidnplayr | 633 | jne .not_terminated |
2390 | hidnplayr | 634 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
2937 | hidnplayr | 635 | jbe .not_terminated |
2390 | hidnplayr | 636 | test ecx, ecx |
2937 | hidnplayr | 637 | jz .not_terminated |
1733 | hidnplayr | 638 | |
2937 | hidnplayr | 639 | mov eax, ebx |
640 | call TCP_close |
||
641 | ;;;TODO: update stats |
||
2390 | hidnplayr | 642 | jmp .drop_with_reset |
1733 | hidnplayr | 643 | |
644 | ;---------------------------------------- |
||
2937 | hidnplayr | 645 | ; Remove data beyond right edge of window (700-736) |
1733 | hidnplayr | 646 | |
2937 | hidnplayr | 647 | .not_terminated: |
2390 | hidnplayr | 648 | mov eax, [edx + TCP_header.SequenceNumber] |
649 | add eax, ecx |
||
650 | sub eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
2957 | hidnplayr | 651 | sub eax, [ebx + TCP_SOCKET.RCV_WND] ; eax now holds the number of bytes to drop |
2942 | hidnplayr | 652 | jle .no_excess_data |
1733 | hidnplayr | 653 | |
2942 | hidnplayr | 654 | DEBUGF 1,"%d bytes beyond right edge of window\n", eax |
655 | |||
1733 | hidnplayr | 656 | ;;; TODO: update stats |
2390 | hidnplayr | 657 | cmp eax, ecx |
2942 | hidnplayr | 658 | jl .dont_drop_all |
2937 | hidnplayr | 659 | ; If a new connection request is received while in TIME_WAIT, drop the old connection and start over, |
660 | ; if the sequence numbers are above the previous ones |
||
1733 | hidnplayr | 661 | |
2937 | hidnplayr | 662 | test [edx + TCP_header.Flags], TH_SYN |
663 | jz .no_new_request |
||
664 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
665 | jne .no_new_request |
||
2942 | hidnplayr | 666 | ; mov edx, [ebx + TCP_SOCKET.RCV_NXT] |
667 | ; cmp edx, [edx + TCP_header.SequenceNumber] |
||
668 | ; add edx, 64000 ; TCP_ISSINCR FIXME |
||
2937 | hidnplayr | 669 | mov eax, ebx |
670 | call TCP_close |
||
671 | jmp .findpcb ; FIXME: skip code for unscaling window, ... |
||
672 | .no_new_request: |
||
1733 | hidnplayr | 673 | |
2937 | hidnplayr | 674 | ; If window is closed can only take segments at window edge, and have to drop data and PUSH from |
675 | ; incoming segments. Continue processing, but remember to ACK. Otherwise drop segment and ACK |
||
676 | |||
677 | cmp [ebx + TCP_SOCKET.RCV_WND], 0 |
||
678 | jne .drop_after_ack |
||
679 | mov eax, [edx + TCP_header.SequenceNumber] |
||
680 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
681 | jne .drop_after_ack |
||
682 | |||
683 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
684 | ;;; TODO: update stats |
||
685 | jmp .no_excess_data |
||
1733 | hidnplayr | 686 | .dont_drop_all: |
2937 | hidnplayr | 687 | ;;; TODO: update stats |
688 | ;;; TODO: 733 |
||
2957 | hidnplayr | 689 | |
2937 | hidnplayr | 690 | sub ecx, eax |
691 | and [ebx + TCP_SOCKET.t_flags], not (TH_PUSH or TH_FIN) |
||
1733 | hidnplayr | 692 | .no_excess_data: |
693 | |||
2957 | hidnplayr | 694 | ;--------------------- FIXME ------------------- |
695 | |||
696 | pusha |
||
697 | movzx esi, [edx + TCP_header.DataOffset] |
||
698 | add esi, edx |
||
699 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
700 | call SOCKET_ring_write ; Add the data to the socket buffer |
||
701 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
||
702 | popa |
||
703 | |||
704 | ;--------------------- FIXME -------------------- |
||
705 | |||
1733 | hidnplayr | 706 | ;----------------- |
2948 | hidnplayr | 707 | ; Record timestamp (737-746) |
1733 | hidnplayr | 708 | |
2937 | hidnplayr | 709 | ; If last ACK falls within this segments sequence numbers, record its timestamp |
710 | test [ebx + TCP_SOCKET.temp_bits], TCP_BIT_TIMESTAMP |
||
711 | jz .no_timestamp |
||
712 | mov eax, [ebx + TCP_SOCKET.last_ack_sent] |
||
713 | sub eax, [edx + TCP_header.SequenceNumber] |
||
714 | jb .no_timestamp |
||
715 | test [ebx + TCP_header.Flags], TH_SYN or TH_FIN ; syn and fin occupy one byte |
||
716 | jz @f |
||
717 | dec eax |
||
718 | @@: |
||
719 | sub eax, ecx |
||
720 | jae .no_timestamp |
||
1733 | hidnplayr | 721 | |
2948 | hidnplayr | 722 | DEBUGF 1,"Recording timestamp\n" |
723 | |||
3251 | hidnplayr | 724 | mov eax, [esp + 4] ; tcp_now |
2937 | hidnplayr | 725 | mov [ebx + TCP_SOCKET.ts_recent_age], eax |
726 | mov eax, [ebx + TCP_SOCKET.ts_val] |
||
727 | mov [ebx + TCP_SOCKET.ts_recent], eax |
||
728 | .no_timestamp: |
||
1733 | hidnplayr | 729 | |
730 | ;------------------ |
||
731 | ; Process RST flags |
||
732 | |||
2390 | hidnplayr | 733 | test [edx + TCP_header.Flags], TH_RST |
2891 | hidnplayr | 734 | jz .no_rst |
1733 | hidnplayr | 735 | |
2891 | hidnplayr | 736 | DEBUGF 1,"TCP_input: Got an RST flag\n" |
1733 | hidnplayr | 737 | |
2390 | hidnplayr | 738 | mov eax, [ebx + TCP_SOCKET.t_state] |
739 | shl eax, 2 |
||
740 | jmp dword [eax + .rst_sw_list] |
||
1733 | hidnplayr | 741 | |
742 | .rst_sw_list: |
||
2891 | hidnplayr | 743 | dd .no_rst ; TCPS_CLOSED |
744 | dd .no_rst ; TCPS_LISTEN |
||
745 | dd .no_rst ; TCPS_SYN_SENT |
||
746 | dd .econnrefused ; TCPS_SYN_RECEIVED |
||
747 | dd .econnreset ; TCPS_ESTABLISHED |
||
748 | dd .econnreset ; TCPS_CLOSE_WAIT |
||
749 | dd .econnreset ; TCPS_FIN_WAIT_1 |
||
750 | dd .rst_close ; TCPS_CLOSING |
||
751 | dd .rst_close ; TCPS_LAST_ACK |
||
752 | dd .econnreset ; TCPS_FIN_WAIT_2 |
||
753 | dd .rst_close ; TCPS_TIMED_WAIT |
||
1733 | hidnplayr | 754 | |
755 | .econnrefused: |
||
2891 | hidnplayr | 756 | DEBUGF 1,"TCP_input: Connection refused\n" |
1733 | hidnplayr | 757 | |
2390 | hidnplayr | 758 | mov [ebx + SOCKET.errorcode], ECONNREFUSED |
759 | jmp .close |
||
1733 | hidnplayr | 760 | |
761 | .econnreset: |
||
2891 | hidnplayr | 762 | DEBUGF 1,"TCP_input: Connection reset\n" |
1733 | hidnplayr | 763 | |
2390 | hidnplayr | 764 | mov [ebx + SOCKET.errorcode], ECONNRESET |
1733 | hidnplayr | 765 | |
2882 | hidnplayr | 766 | .close: |
2891 | hidnplayr | 767 | DEBUGF 1,"TCP_input: Closing connection\n" |
1733 | hidnplayr | 768 | |
2390 | hidnplayr | 769 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
2937 | hidnplayr | 770 | ;;; TODO: update stats (tcp drops) |
2390 | hidnplayr | 771 | mov eax, ebx |
772 | call TCP_close |
||
773 | jmp .drop |
||
1733 | hidnplayr | 774 | |
775 | .rst_close: |
||
2891 | hidnplayr | 776 | DEBUGF 1,"TCP_input: Closing with reset\n" |
1733 | hidnplayr | 777 | |
2390 | hidnplayr | 778 | mov eax, ebx |
779 | call TCP_close |
||
780 | jmp .drop |
||
1733 | hidnplayr | 781 | |
2891 | hidnplayr | 782 | .no_rst: |
1733 | hidnplayr | 783 | |
784 | ;-------------------------------------- |
||
785 | ; handle SYN-full and ACK-less segments |
||
786 | |||
2390 | hidnplayr | 787 | test [edx + TCP_header.Flags], TH_SYN |
2937 | hidnplayr | 788 | jz .not_syn_full |
1733 | hidnplayr | 789 | |
2390 | hidnplayr | 790 | mov eax, ebx |
791 | mov ebx, ECONNRESET |
||
792 | call TCP_drop |
||
793 | jmp .drop_with_reset |
||
2937 | hidnplayr | 794 | .not_syn_full: |
1733 | hidnplayr | 795 | |
796 | ;--------------- |
||
797 | ; ACK processing |
||
798 | |||
2891 | hidnplayr | 799 | test [edx + TCP_header.Flags], TH_ACK |
800 | jz .drop |
||
801 | |||
2390 | hidnplayr | 802 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
2937 | hidnplayr | 803 | jb .ack_processed ; states: closed, listen, syn_sent |
804 | ja .no_syn_rcv ; established, fin_wait_1, fin_wait_2, close_wait, closing, last_ack, time_wait |
||
1733 | hidnplayr | 805 | |
2891 | hidnplayr | 806 | DEBUGF 1,"TCP_input: state=syn_received\n" |
1733 | hidnplayr | 807 | |
2390 | hidnplayr | 808 | mov eax, [edx + TCP_header.AckNumber] |
809 | cmp [ebx + TCP_SOCKET.SND_UNA], eax |
||
810 | ja .drop_with_reset |
||
811 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
812 | ja .drop_with_reset |
||
1733 | hidnplayr | 813 | |
2309 | hidnplayr | 814 | ;;; TODO: update stats |
815 | |||
2390 | hidnplayr | 816 | mov eax, ebx |
817 | call SOCKET_is_connected |
||
818 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
||
1831 | hidnplayr | 819 | |
820 | ; Do window scaling? |
||
821 | |||
2390 | hidnplayr | 822 | test [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
823 | jz @f |
||
824 | test [ebx + TCP_SOCKET.t_flags], TF_REQ_SCALE |
||
825 | jz @f |
||
1831 | hidnplayr | 826 | |
2390 | hidnplayr | 827 | push word [ebx + TCP_SOCKET.requested_s_scale] ; Set send and receive scale factors to the received values |
828 | pop word [ebx + TCP_SOCKET.SND_SCALE] |
||
1831 | hidnplayr | 829 | @@: |
830 | |||
2891 | hidnplayr | 831 | ;;; TODO: call TCP_reassemble |
1831 | hidnplayr | 832 | |
2390 | hidnplayr | 833 | mov eax, [edx + TCP_header.SequenceNumber] |
834 | dec eax |
||
835 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
1831 | hidnplayr | 836 | |
1733 | hidnplayr | 837 | .no_syn_rcv: |
838 | |||
2937 | hidnplayr | 839 | ;------------------------- |
840 | ; check for duplicate ACKs |
||
1733 | hidnplayr | 841 | |
2390 | hidnplayr | 842 | mov eax, [edx + TCP_header.AckNumber] |
843 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
844 | ja .not_dup_ack |
||
1733 | hidnplayr | 845 | |
2390 | hidnplayr | 846 | test ecx, ecx |
847 | jnz .reset_dupacks |
||
1733 | hidnplayr | 848 | |
2390 | hidnplayr | 849 | mov eax, dword [edx + TCP_header.Window] |
850 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
851 | jne .reset_dupacks |
||
1733 | hidnplayr | 852 | |
2891 | hidnplayr | 853 | DEBUGF 1,"TCP_input: Processing duplicate ACK\n" |
1733 | hidnplayr | 854 | |
2948 | hidnplayr | 855 | ; If we have outstanding data, other than a window probe, this is a completely duplicate ACK |
2937 | hidnplayr | 856 | ; (window info didnt change) The ACK is the biggest we've seen and we've seen exactly our rexmt threshold of them, |
857 | ; assume a packet has been dropped and retransmit it. Kludge snd_nxt & the congestion window so we send only this one packet. |
||
1733 | hidnplayr | 858 | |
2937 | hidnplayr | 859 | cmp [ebx + TCP_SOCKET.timer_retransmission], 0 ;;;; FIXME |
860 | jg @f |
||
861 | |||
2390 | hidnplayr | 862 | mov eax, [edx + TCP_header.AckNumber] |
863 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
864 | je .dup_ack |
||
1763 | hidnplayr | 865 | |
866 | @@: |
||
2390 | hidnplayr | 867 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
868 | jmp .not_dup_ack |
||
1763 | hidnplayr | 869 | |
870 | .dup_ack: |
||
2390 | hidnplayr | 871 | inc [ebx + TCP_SOCKET.t_dupacks] |
872 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
||
873 | jne .no_re_xmit |
||
1763 | hidnplayr | 874 | |
2390 | hidnplayr | 875 | push [ebx + TCP_SOCKET.SND_NXT] ; >>>> |
1763 | hidnplayr | 876 | |
2390 | hidnplayr | 877 | mov eax, [ebx + TCP_SOCKET.SND_WND] |
878 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
||
2866 | hidnplayr | 879 | cmova eax, [ebx + TCP_SOCKET.SND_CWND] |
2390 | hidnplayr | 880 | shr eax, 1 |
881 | push edx |
||
882 | xor edx, edx |
||
883 | div [ebx + TCP_SOCKET.t_maxseg] |
||
884 | cmp eax, 2 |
||
2937 | hidnplayr | 885 | ja @f |
886 | xor eax, eax |
||
887 | mov al, 2 |
||
1763 | hidnplayr | 888 | @@: |
2390 | hidnplayr | 889 | mul [ebx + TCP_SOCKET.t_maxseg] |
890 | pop edx |
||
891 | mov [ebx + TCP_SOCKET.SND_SSTHRESH], eax |
||
1763 | hidnplayr | 892 | |
2390 | hidnplayr | 893 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 ; turn off retransmission timer |
894 | mov [ebx + TCP_SOCKET.t_rtt], 0 |
||
895 | mov eax, [edx + TCP_header.AckNumber] |
||
896 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
897 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
898 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
1763 | hidnplayr | 899 | |
2390 | hidnplayr | 900 | mov eax, ebx |
901 | call TCP_output ; retransmit missing segment |
||
1763 | hidnplayr | 902 | |
2390 | hidnplayr | 903 | push edx |
904 | xor edx, edx |
||
905 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
906 | mul [ebx + TCP_SOCKET.t_dupacks] |
||
907 | pop edx |
||
908 | add eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
||
909 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
1763 | hidnplayr | 910 | |
2390 | hidnplayr | 911 | pop eax ; <<<< |
912 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
913 | jb @f |
||
914 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1763 | hidnplayr | 915 | @@: |
916 | |||
2390 | hidnplayr | 917 | jmp .drop |
1733 | hidnplayr | 918 | |
919 | |||
1763 | hidnplayr | 920 | .no_re_xmit: |
2390 | hidnplayr | 921 | jbe .not_dup_ack |
1733 | hidnplayr | 922 | |
2891 | hidnplayr | 923 | DEBUGF 1,"TCP_input: Increasing congestion window\n" |
1733 | hidnplayr | 924 | |
2390 | hidnplayr | 925 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
926 | add [ebx + TCP_SOCKET.SND_CWND], eax |
||
1733 | hidnplayr | 927 | |
2390 | hidnplayr | 928 | mov eax, ebx |
929 | call TCP_output |
||
1733 | hidnplayr | 930 | |
2390 | hidnplayr | 931 | jmp .drop |
1733 | hidnplayr | 932 | |
933 | |||
1763 | hidnplayr | 934 | .not_dup_ack: |
935 | |||
1733 | hidnplayr | 936 | ;------------------------------------------------- |
937 | ; If the congestion window was inflated to account |
||
938 | ; for the other side's cached packets, retract it |
||
939 | |||
2390 | hidnplayr | 940 | mov eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
941 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
||
942 | ja @f |
||
943 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
||
944 | jbe @f |
||
945 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
1763 | hidnplayr | 946 | @@: |
1733 | hidnplayr | 947 | |
2390 | hidnplayr | 948 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
1733 | hidnplayr | 949 | |
2390 | hidnplayr | 950 | mov eax, [edx + TCP_header.AckNumber] |
951 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
952 | jbe @f |
||
1733 | hidnplayr | 953 | |
2390 | hidnplayr | 954 | ;;; TODO: update stats |
955 | jmp .drop_after_ack |
||
1733 | hidnplayr | 956 | |
1763 | hidnplayr | 957 | @@: |
1733 | hidnplayr | 958 | |
2390 | hidnplayr | 959 | mov edi, [edx + TCP_header.AckNumber] |
960 | sub edi, [ebx + TCP_SOCKET.SND_UNA] ; now we got the number of acked bytes in edi |
||
1733 | hidnplayr | 961 | |
2390 | hidnplayr | 962 | ;;; TODO: update stats |
1733 | hidnplayr | 963 | |
2891 | hidnplayr | 964 | DEBUGF 1,"TCP_input: acceptable ACK for %u bytes\n", edi |
1763 | hidnplayr | 965 | |
1733 | hidnplayr | 966 | ;------------------------------------------ |
2937 | hidnplayr | 967 | ; RTT measurements and retransmission timer (912-926) |
1733 | hidnplayr | 968 | |
2937 | hidnplayr | 969 | ; If we have a timestamp, update smoothed RTT |
1733 | hidnplayr | 970 | |
2937 | hidnplayr | 971 | test [ebx + TCP_SOCKET.temp_bits], TCP_BIT_TIMESTAMP |
2948 | hidnplayr | 972 | jz .timestamp_not_present |
3251 | hidnplayr | 973 | mov eax, [esp+4] |
2937 | hidnplayr | 974 | sub eax, [ebx + TCP_SOCKET.ts_ecr] |
975 | inc eax |
||
976 | call TCP_xmit_timer |
||
977 | jmp .rtt_done_ |
||
1733 | hidnplayr | 978 | |
2937 | hidnplayr | 979 | ; If no timestamp but transmit timer is running and timed sequence number was acked, |
980 | ; update smoothed RTT. Since we now have an RTT measurement, cancel the timer backoff |
||
981 | ; (Phil Karn's retransmit algo) |
||
982 | ; Recompute the initial retransmit timer |
||
983 | |||
984 | .timestamp_not_present: |
||
985 | mov eax, [edx + TCP_header.AckNumber] |
||
986 | cmp eax, [ebx + TCP_SOCKET.t_rtseq] |
||
987 | jbe .rtt_done_ |
||
988 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
||
989 | test eax, eax |
||
990 | jz .rtt_done_ |
||
991 | call TCP_xmit_timer |
||
992 | |||
993 | .rtt_done_: |
||
994 | |||
995 | ; If all outstanding data is acked, stop retransmit timer and remember to restart (more output or persist) |
||
996 | ; If there is more data to be acked, restart retransmit timer, using current (possible backed-off) value. |
||
997 | |||
2390 | hidnplayr | 998 | mov eax, [ebx + TCP_SOCKET.SND_MAX] |
999 | cmp eax, [edx + TCP_header.AckNumber] |
||
2937 | hidnplayr | 1000 | jne .more_data |
1001 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 |
||
1002 | or [ebx + TCP_SOCKET.temp_bits], TCP_BIT_NEEDOUTPUT |
||
1003 | jmp .no_restart |
||
1004 | .more_data: |
||
1005 | cmp [ebx + TCP_SOCKET.timer_persist], 0 |
||
1006 | jne .no_restart |
||
2891 | hidnplayr | 1007 | |
2937 | hidnplayr | 1008 | mov eax, [ebx + TCP_SOCKET.t_rxtcur] |
2955 | hidnplayr | 1009 | mov [ebx + TCP_SOCKET.timer_retransmission], eax |
1733 | hidnplayr | 1010 | |
2937 | hidnplayr | 1011 | .no_restart: |
1012 | |||
1013 | |||
1733 | hidnplayr | 1014 | ;------------------------------------------- |
1015 | ; Open congestion window in response to ACKs |
||
1016 | |||
2390 | hidnplayr | 1017 | mov esi, [ebx + TCP_SOCKET.SND_CWND] |
1018 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
1733 | hidnplayr | 1019 | |
2390 | hidnplayr | 1020 | cmp esi, [ebx + TCP_SOCKET.SND_SSTHRESH] |
1021 | jbe @f |
||
1022 | push edx |
||
1023 | push eax |
||
1024 | mul eax |
||
1025 | div esi |
||
1026 | pop edx |
||
1027 | shr edx, 3 |
||
1028 | add eax, edx |
||
1029 | pop edx |
||
1763 | hidnplayr | 1030 | @@: |
1733 | hidnplayr | 1031 | |
2390 | hidnplayr | 1032 | add esi, eax |
1733 | hidnplayr | 1033 | |
2390 | hidnplayr | 1034 | push ecx |
1035 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
||
1036 | mov eax, TCP_max_win |
||
1037 | shl eax, cl |
||
1038 | pop ecx |
||
1733 | hidnplayr | 1039 | |
2390 | hidnplayr | 1040 | cmp esi, eax |
2866 | hidnplayr | 1041 | cmova esi, eax |
2390 | hidnplayr | 1042 | mov [ebx + TCP_SOCKET.SND_CWND], esi |
1733 | hidnplayr | 1043 | |
2891 | hidnplayr | 1044 | ;------------------------------------------ |
1045 | ; Remove acknowledged data from send buffer |
||
1733 | hidnplayr | 1046 | |
2891 | hidnplayr | 1047 | cmp edi, [ebx + STREAM_SOCKET.snd.size] |
1048 | jbe .finiacked |
||
1733 | hidnplayr | 1049 | |
2891 | hidnplayr | 1050 | push ecx edx ebx |
1051 | mov ecx, [ebx + STREAM_SOCKET.snd.size] |
||
1052 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1053 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
||
1054 | call SOCKET_ring_free |
||
1055 | pop ebx edx ecx |
||
1733 | hidnplayr | 1056 | |
2891 | hidnplayr | 1057 | DEBUGF 1,"TCP_input: our FIN is acked\n" |
1058 | stc |
||
1763 | hidnplayr | 1059 | |
2891 | hidnplayr | 1060 | jmp .wakeup |
1763 | hidnplayr | 1061 | |
2891 | hidnplayr | 1062 | .finiacked: |
1763 | hidnplayr | 1063 | |
2390 | hidnplayr | 1064 | push ecx edx ebx |
1065 | mov ecx, edi |
||
1066 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1067 | call SOCKET_ring_free |
||
1068 | pop ebx |
||
1069 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
||
1070 | pop edx ecx |
||
1733 | hidnplayr | 1071 | |
2891 | hidnplayr | 1072 | DEBUGF 1,"TCP_input: our FIN is not acked\n" |
1073 | clc |
||
1074 | |||
1075 | ;---------------------------------------- |
||
1733 | hidnplayr | 1076 | ; Wake up process waiting on send buffer |
1077 | |||
2891 | hidnplayr | 1078 | .wakeup: |
1079 | |||
3251 | hidnplayr | 1080 | pushf ; Why? |
2390 | hidnplayr | 1081 | mov eax, ebx |
3257 | hidnplayr | 1082 | call SOCKET_notify |
1733 | hidnplayr | 1083 | |
1831 | hidnplayr | 1084 | ; Update TCPS |
1733 | hidnplayr | 1085 | |
2390 | hidnplayr | 1086 | mov eax, [edx + TCP_header.AckNumber] |
1087 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
1088 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
1089 | jb @f |
||
1090 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1733 | hidnplayr | 1091 | @@: |
1092 | |||
2891 | hidnplayr | 1093 | popf |
1733 | hidnplayr | 1094 | |
1095 | ; General ACK handling complete |
||
1096 | ; Now do the state-specific ones |
||
1097 | |||
2390 | hidnplayr | 1098 | mov eax, [ebx + TCP_SOCKET.t_state] |
1099 | jmp dword [eax*4 + .ACK_sw_list] |
||
1733 | hidnplayr | 1100 | |
1101 | .ACK_sw_list: |
||
2891 | hidnplayr | 1102 | dd .ack_processed ; TCPS_CLOSED |
1103 | dd .ack_processed ; TCPS_LISTEN |
||
1104 | dd .ack_processed ; TCPS_SYN_SENT |
||
1105 | dd .ack_processed ; TCPS_SYN_RECEIVED |
||
1106 | dd .ack_processed ; TCPS_ESTABLISHED |
||
1107 | dd .ack_processed ; TCPS_CLOSE_WAIT |
||
1108 | dd .ack_fw1 ; TCPS_FIN_WAIT_1 |
||
1109 | dd .ack_c ; TCPS_CLOSING |
||
1110 | dd .ack_la ; TCPS_LAST_ACK |
||
1111 | dd .ack_processed ; TCPS_FIN_WAIT_2 |
||
1112 | dd .ack_tw ; TCPS_TIMED_WAIT |
||
1733 | hidnplayr | 1113 | |
1114 | |||
1772 | hidnplayr | 1115 | .ack_fw1: |
2891 | hidnplayr | 1116 | jnc .ack_processed |
1733 | hidnplayr | 1117 | |
2390 | hidnplayr | 1118 | test [ebx + SOCKET.state], SS_CANTRCVMORE |
1119 | jnz @f |
||
1120 | mov eax, ebx |
||
1121 | call SOCKET_is_disconnected |
||
2937 | hidnplayr | 1122 | mov [ebx + TCP_SOCKET.timer_timed_wait], TCP_time_max_idle |
1772 | hidnplayr | 1123 | @@: |
2390 | hidnplayr | 1124 | mov [ebx + TCP_SOCKET.t_state], TCPS_FIN_WAIT_2 |
1125 | jmp .ack_processed |
||
1733 | hidnplayr | 1126 | |
1772 | hidnplayr | 1127 | .ack_c: |
2891 | hidnplayr | 1128 | jnc .ack_processed |
1772 | hidnplayr | 1129 | |
2390 | hidnplayr | 1130 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1131 | mov eax, ebx |
||
1132 | call TCP_cancel_timers |
||
1133 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
1134 | mov eax, ebx |
||
1135 | call SOCKET_is_disconnected |
||
1136 | jmp .ack_processed |
||
1733 | hidnplayr | 1137 | |
1772 | hidnplayr | 1138 | .ack_la: |
2891 | hidnplayr | 1139 | jnc .ack_processed |
1733 | hidnplayr | 1140 | |
2390 | hidnplayr | 1141 | mov eax, ebx |
2882 | hidnplayr | 1142 | call TCP_disconnect |
2390 | hidnplayr | 1143 | jmp .drop |
1733 | hidnplayr | 1144 | |
1772 | hidnplayr | 1145 | .ack_tw: |
2390 | hidnplayr | 1146 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
1147 | jmp .drop_after_ack |
||
1733 | hidnplayr | 1148 | |
2930 | hidnplayr | 1149 | .reset_dupacks: ; We got a new ACK, reset duplicate ACK counter |
1150 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
||
1151 | jmp .ack_processed |
||
1733 | hidnplayr | 1152 | |
1772 | hidnplayr | 1153 | |
1733 | hidnplayr | 1154 | |
1155 | |||
2930 | hidnplayr | 1156 | |
1157 | |||
1158 | .LISTEN: |
||
1159 | |||
1160 | DEBUGF 1,"TCP_input: state=listen\n" |
||
1161 | |||
2937 | hidnplayr | 1162 | test [edx + TCP_header.Flags], TH_RST |
2930 | hidnplayr | 1163 | jnz .drop |
1164 | |||
1165 | test [edx + TCP_header.Flags], TH_ACK |
||
1166 | jnz .drop_with_reset |
||
1167 | |||
1168 | test [edx + TCP_header.Flags], TH_SYN |
||
1169 | jz .drop |
||
1170 | |||
1171 | ;;; TODO: check if it's a broadcast or multicast, and drop if so |
||
1172 | |||
1173 | push dword [edi] ; Ipv4 source addres |
||
1174 | pop [ebx + IP_SOCKET.RemoteIP] |
||
1175 | |||
1176 | push [edx + TCP_header.SourcePort] |
||
1177 | pop [ebx + TCP_SOCKET.RemotePort] |
||
1178 | |||
1179 | push [edx + TCP_header.SequenceNumber] |
||
1180 | pop [ebx + TCP_SOCKET.IRS] |
||
1181 | |||
1182 | mov eax, [TCP_sequence_num] |
||
1183 | add [TCP_sequence_num], 64000 / 2 |
||
1184 | mov [ebx + TCP_SOCKET.ISS], eax |
||
1185 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1186 | |||
1187 | TCP_sendseqinit ebx |
||
1188 | TCP_rcvseqinit ebx |
||
1189 | |||
1190 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
||
1191 | mov [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1192 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval ;;;; macro |
||
1193 | |||
1194 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1195 | call SOCKET_ring_create |
||
1196 | |||
1197 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
1198 | call SOCKET_ring_create |
||
1199 | |||
2937 | hidnplayr | 1200 | and [ebx + TCP_SOCKET.temp_bits], not TCP_BIT_DROPSOCKET |
1201 | |||
2930 | hidnplayr | 1202 | ;;; call SOCKET_notify_owner |
1203 | |||
1204 | jmp .trim_then_step6 |
||
1205 | |||
1206 | |||
1207 | |||
1208 | |||
1209 | |||
1210 | |||
1211 | |||
1212 | |||
1213 | |||
1214 | |||
1215 | ;------------ |
||
1216 | ; Active Open |
||
1217 | |||
1218 | align 4 |
||
2937 | hidnplayr | 1219 | .SYN_SENT: |
2930 | hidnplayr | 1220 | |
1221 | DEBUGF 1,"TCP_input: state=syn_sent\n" |
||
1222 | |||
1223 | test [edx + TCP_header.Flags], TH_ACK |
||
1224 | jz @f |
||
1225 | |||
1226 | mov eax, [edx + TCP_header.AckNumber] |
||
1227 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
1228 | jbe .drop_with_reset |
||
1229 | |||
1230 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
1231 | ja .drop_with_reset |
||
1232 | @@: |
||
1233 | |||
1234 | test [edx + TCP_header.Flags], TH_RST |
||
1235 | jz @f |
||
1236 | |||
1237 | test [edx + TCP_header.Flags], TH_ACK |
||
1238 | jz .drop |
||
1239 | |||
1240 | mov eax, ebx |
||
1241 | mov ebx, ECONNREFUSED |
||
1242 | call TCP_drop |
||
1243 | |||
1244 | jmp .drop |
||
1245 | @@: |
||
1246 | |||
1247 | test [edx + TCP_header.Flags], TH_SYN |
||
1248 | jz .drop |
||
1249 | |||
1250 | ; at this point, segment seems to be valid |
||
1251 | |||
1252 | test [edx + TCP_header.Flags], TH_ACK |
||
1253 | jz .no_syn_ack |
||
1254 | |||
1255 | ; now, process received SYN in response to an active open |
||
1256 | |||
1257 | mov eax, [edx + TCP_header.AckNumber] |
||
1258 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
1259 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
1260 | jbe @f |
||
1261 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1262 | @@: |
||
1263 | |||
1264 | .no_syn_ack: |
||
1265 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 ; disable retransmission |
||
1266 | |||
1267 | push [edx + TCP_header.SequenceNumber] |
||
1268 | pop [ebx + TCP_SOCKET.IRS] |
||
1269 | |||
1270 | TCP_rcvseqinit ebx |
||
1271 | |||
1272 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1273 | |||
1274 | mov eax, [ebx + TCP_SOCKET.SND_UNA] |
||
1275 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
1276 | jbe .simultaneous_open |
||
1277 | |||
1278 | test [edx + TCP_header.Flags], TH_ACK |
||
1279 | jz .simultaneous_open |
||
1280 | |||
1281 | DEBUGF 1,"TCP_input: active open\n" |
||
1282 | |||
1283 | ;;; TODO: update stats |
||
1284 | |||
1285 | ; set socket state to connected |
||
1286 | mov [ebx + SOCKET.state], SS_ISCONNECTED |
||
1287 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
||
1288 | |||
2937 | hidnplayr | 1289 | ; Do window scaling on this connection ? |
1290 | mov eax, [ebx + TCP_SOCKET.t_flags] |
||
1291 | and eax, TF_REQ_SCALE or TF_RCVD_SCALE |
||
1292 | cmp eax, TF_REQ_SCALE or TF_RCVD_SCALE |
||
1293 | jne .no_scaling |
||
2930 | hidnplayr | 1294 | |
2937 | hidnplayr | 1295 | mov ax, word [ebx + TCP_SOCKET.requested_s_scale] |
1296 | mov word [ebx + TCP_SOCKET.SND_SCALE], ax |
||
1297 | .no_scaling: |
||
2930 | hidnplayr | 1298 | |
2937 | hidnplayr | 1299 | ;;; TODO: reassemble packets queue |
1300 | |||
1301 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
||
1302 | test eax, eax |
||
1303 | je .trim_then_step6 |
||
1304 | call TCP_xmit_timer |
||
2930 | hidnplayr | 1305 | jmp .trim_then_step6 |
1306 | |||
1307 | .simultaneous_open: |
||
1308 | |||
1309 | DEBUGF 1,"TCP_input: simultaneous open\n" |
||
1310 | ; We have received a syn but no ACK, so we are having a simultaneous open.. |
||
1311 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
||
1312 | |||
1313 | ;------------------------------------- |
||
1314 | ; Common processing for receipt of SYN |
||
1315 | |||
1316 | .trim_then_step6: |
||
1317 | |||
1318 | inc [edx + TCP_header.SequenceNumber] |
||
1319 | |||
1320 | ;;; TODO: Drop any received data that follows receive window (590) |
||
1321 | |||
1322 | mov eax, [edx + TCP_header.SequenceNumber] |
||
1323 | mov [ebx + TCP_SOCKET.RCV_UP], eax |
||
1324 | dec eax |
||
1325 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
1326 | |||
1327 | |||
1328 | |||
2390 | hidnplayr | 1329 | .ack_processed: ; (step 6) |
1733 | hidnplayr | 1330 | |
2891 | hidnplayr | 1331 | DEBUGF 1,"TCP_input: ACK processed\n" |
1733 | hidnplayr | 1332 | |
1333 | ;---------------------------------------------- |
||
1334 | ; check if we need to update window information |
||
1335 | |||
2390 | hidnplayr | 1336 | test [edx + TCP_header.Flags], TH_ACK |
1337 | jz .no_window_update |
||
1733 | hidnplayr | 1338 | |
2390 | hidnplayr | 1339 | mov eax, [ebx + TCP_SOCKET.SND_WL1] |
1340 | cmp eax, [edx + TCP_header.SequenceNumber] |
||
1341 | jb .update_window |
||
1342 | ja @f |
||
1733 | hidnplayr | 1343 | |
2390 | hidnplayr | 1344 | mov eax, [ebx + TCP_SOCKET.SND_WL2] |
1345 | cmp eax, [edx + TCP_header.AckNumber] |
||
1346 | jb .update_window |
||
1347 | ja .no_window_update |
||
1733 | hidnplayr | 1348 | @@: |
1349 | |||
2390 | hidnplayr | 1350 | mov eax, dword [edx + TCP_header.Window] |
1351 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
1352 | jbe .no_window_update |
||
1733 | hidnplayr | 1353 | |
1354 | .update_window: |
||
1355 | |||
2954 | hidnplayr | 1356 | ;;; TODO: update stats (Keep track of pure window updates) |
1733 | hidnplayr | 1357 | |
2390 | hidnplayr | 1358 | mov eax, dword [edx + TCP_header.Window] |
1359 | cmp eax, [ebx + TCP_SOCKET.max_sndwnd] |
||
1360 | jbe @f |
||
1361 | mov [ebx + TCP_SOCKET.max_sndwnd], eax |
||
1733 | hidnplayr | 1362 | @@: |
2390 | hidnplayr | 1363 | mov [ebx + TCP_SOCKET.SND_WND], eax |
1733 | hidnplayr | 1364 | |
2891 | hidnplayr | 1365 | DEBUGF 1,"TCP_input: Updating window to %u\n", eax |
2612 | hidnplayr | 1366 | |
2390 | hidnplayr | 1367 | push [edx + TCP_header.SequenceNumber] |
1368 | pop [ebx + TCP_SOCKET.SND_WL1] |
||
1733 | hidnplayr | 1369 | |
2390 | hidnplayr | 1370 | push [edx + TCP_header.AckNumber] |
1371 | pop [ebx + TCP_SOCKET.SND_WL2] |
||
1733 | hidnplayr | 1372 | |
2937 | hidnplayr | 1373 | or [ebx + TCP_SOCKET.temp_bits], TCP_BIT_NEEDOUTPUT |
1733 | hidnplayr | 1374 | |
1375 | .no_window_update: |
||
1376 | |||
1377 | ;----------------- |
||
1378 | ; process URG flag |
||
1379 | |||
2390 | hidnplayr | 1380 | test [edx + TCP_header.Flags], TH_URG |
1381 | jz .not_urgent |
||
1733 | hidnplayr | 1382 | |
2390 | hidnplayr | 1383 | cmp [edx + TCP_header.UrgentPointer], 0 |
1384 | jz .not_urgent |
||
1733 | hidnplayr | 1385 | |
2390 | hidnplayr | 1386 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1387 | je .not_urgent |
||
1733 | hidnplayr | 1388 | |
1389 | ; Ignore bogus urgent offsets |
||
1390 | |||
2390 | hidnplayr | 1391 | movzx eax, [edx + TCP_header.UrgentPointer] |
1392 | add eax, [ebx + STREAM_SOCKET.rcv.size] |
||
1393 | cmp eax, SOCKET_MAXDATA |
||
1394 | jbe .not_urgent |
||
1733 | hidnplayr | 1395 | |
2390 | hidnplayr | 1396 | mov [edx + TCP_header.UrgentPointer], 0 |
1397 | and [edx + TCP_header.Flags], not (TH_URG) |
||
1398 | jmp .do_data |
||
1733 | hidnplayr | 1399 | |
1400 | .not_urgent: |
||
1401 | |||
1402 | ; processing of received urgent pointer |
||
1403 | |||
2390 | hidnplayr | 1404 | ;;; TODO (1051-1093) |
1733 | hidnplayr | 1405 | |
1406 | |||
2891 | hidnplayr | 1407 | ;--------------------------------------- |
1408 | ; process the data in the segment (1094) |
||
1733 | hidnplayr | 1409 | |
1410 | .do_data: |
||
1411 | |||
2891 | hidnplayr | 1412 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1413 | jae .final_processing |
||
1733 | hidnplayr | 1414 | |
2390 | hidnplayr | 1415 | test [edx + TCP_header.Flags], TH_FIN |
2891 | hidnplayr | 1416 | jnz @f |
1733 | hidnplayr | 1417 | |
2390 | hidnplayr | 1418 | test ecx, ecx |
2891 | hidnplayr | 1419 | jnz .final_processing |
1420 | @@: |
||
1733 | hidnplayr | 1421 | |
2891 | hidnplayr | 1422 | ; call TCP_reassemble ;;; TODO |
1733 | hidnplayr | 1423 | |
1424 | ;--------------- |
||
1425 | ; FIN processing |
||
1426 | |||
2891 | hidnplayr | 1427 | test [edx + TCP_header.Flags], TH_FIN |
2930 | hidnplayr | 1428 | jz .final_processing |
1733 | hidnplayr | 1429 | |
2891 | hidnplayr | 1430 | DEBUGF 1,"TCP_input: Processing FIN\n" |
1733 | hidnplayr | 1431 | |
2891 | hidnplayr | 1432 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1433 | jae .not_first_fin |
||
1774 | hidnplayr | 1434 | |
2891 | hidnplayr | 1435 | DEBUGF 1,"TCP_input: First FIN for this connection\n" |
1774 | hidnplayr | 1436 | |
2390 | hidnplayr | 1437 | mov eax, ebx |
1438 | call SOCKET_cant_recv_more |
||
1774 | hidnplayr | 1439 | |
2390 | hidnplayr | 1440 | mov [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1441 | inc [ebx + TCP_SOCKET.RCV_NXT] |
||
1774 | hidnplayr | 1442 | |
1443 | .not_first_fin: |
||
2390 | hidnplayr | 1444 | mov eax, [ebx + TCP_SOCKET.t_state] |
1445 | shl eax, 2 |
||
1446 | jmp dword [eax + .FIN_sw_list] |
||
1733 | hidnplayr | 1447 | |
1448 | .FIN_sw_list: |
||
2937 | hidnplayr | 1449 | dd .final_processing ; TCPS_CLOSED |
1450 | dd .final_processing ; TCPS_LISTEN |
||
1451 | dd .final_processing ; TCPS_SYN_SENT |
||
1452 | dd .fin_syn_est ; TCPS_SYN_RECEIVED |
||
1453 | dd .fin_syn_est ; TCPS_ESTABLISHED |
||
1454 | dd .final_processing ; TCPS_CLOSE_WAIT |
||
1455 | dd .fin_wait1 ; TCPS_FIN_WAIT_1 |
||
1456 | dd .final_processing ; TCPS_CLOSING |
||
1457 | dd .final_processing ; TCPS_LAST_ACK |
||
1458 | dd .fin_wait2 ; TCPS_FIN_WAIT_2 |
||
1459 | dd .fin_timed ; TCPS_TIMED_WAIT |
||
1733 | hidnplayr | 1460 | |
1461 | .fin_syn_est: |
||
1462 | |||
2390 | hidnplayr | 1463 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
2930 | hidnplayr | 1464 | jmp .final_processing |
1733 | hidnplayr | 1465 | |
1466 | .fin_wait1: |
||
1467 | |||
2390 | hidnplayr | 1468 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSING |
2930 | hidnplayr | 1469 | jmp .final_processing |
1733 | hidnplayr | 1470 | |
1471 | .fin_wait2: |
||
1472 | |||
2390 | hidnplayr | 1473 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1474 | mov eax, ebx |
||
1475 | call TCP_cancel_timers |
||
1476 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
1477 | call SOCKET_is_disconnected |
||
2930 | hidnplayr | 1478 | jmp .final_processing |
1733 | hidnplayr | 1479 | |
1480 | .fin_timed: |
||
2390 | hidnplayr | 1481 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
2930 | hidnplayr | 1482 | jmp .final_processing |
1733 | hidnplayr | 1483 | |
1484 | |||
2930 | hidnplayr | 1485 | .drop_after_ack: |
1486 | DEBUGF 1,"TCP_input: Drop after ACK\n" |
||
1733 | hidnplayr | 1487 | |
2930 | hidnplayr | 1488 | push edx ebx |
2891 | hidnplayr | 1489 | lea ecx, [ebx + SOCKET.mutex] |
1490 | call mutex_unlock |
||
2930 | hidnplayr | 1491 | pop eax edx |
2891 | hidnplayr | 1492 | |
2930 | hidnplayr | 1493 | test [edx + TCP_header.Flags], TH_RST |
1494 | jnz .dumpit |
||
1733 | hidnplayr | 1495 | |
2930 | hidnplayr | 1496 | or [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
1497 | jmp .need_output |
||
2891 | hidnplayr | 1498 | |
1733 | hidnplayr | 1499 | |
2891 | hidnplayr | 1500 | |
2930 | hidnplayr | 1501 | .drop_with_reset: |
1502 | DEBUGF 1,"TCP_input: Drop with reset\n" |
||
1503 | |||
1504 | push ebx edx |
||
2402 | hidnplayr | 1505 | lea ecx, [ebx + SOCKET.mutex] |
1506 | call mutex_unlock |
||
2930 | hidnplayr | 1507 | pop edx ebx |
1733 | hidnplayr | 1508 | |
2930 | hidnplayr | 1509 | test [edx + TCP_header.Flags], TH_RST |
1510 | jnz .dumpit |
||
1733 | hidnplayr | 1511 | |
2930 | hidnplayr | 1512 | ;;; if its a multicast/broadcast, also drop |
1733 | hidnplayr | 1513 | |
2930 | hidnplayr | 1514 | test [edx + TCP_header.Flags], TH_ACK |
1515 | jnz .respond_ack |
||
1733 | hidnplayr | 1516 | |
2930 | hidnplayr | 1517 | test [edx + TCP_header.Flags], TH_SYN |
1518 | jnz .respond_syn |
||
1519 | jmp .dumpit |
||
1733 | hidnplayr | 1520 | |
2930 | hidnplayr | 1521 | ;----------------- |
1522 | ; Final processing |
||
1733 | hidnplayr | 1523 | |
2930 | hidnplayr | 1524 | .final_processing: |
1525 | DEBUGF 1,"TCP_input: Final processing\n" |
||
1733 | hidnplayr | 1526 | |
2930 | hidnplayr | 1527 | push ebx |
1528 | lea ecx, [ebx + SOCKET.mutex] |
||
1529 | call mutex_unlock |
||
1530 | pop eax |
||
1733 | hidnplayr | 1531 | |
2937 | hidnplayr | 1532 | test [eax + TCP_SOCKET.temp_bits], TCP_BIT_NEEDOUTPUT |
1533 | jnz .need_output |
||
1733 | hidnplayr | 1534 | |
2930 | hidnplayr | 1535 | test [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
1536 | jz .dumpit |
||
1537 | DEBUGF 1,"TCP_input: ACK now!\n" |
||
1733 | hidnplayr | 1538 | |
2930 | hidnplayr | 1539 | .need_output: |
2954 | hidnplayr | 1540 | DEBUGF 1,"TCP_input: need output\n" |
3252 | hidnplayr | 1541 | |
2930 | hidnplayr | 1542 | call TCP_output |
1733 | hidnplayr | 1543 | |
2930 | hidnplayr | 1544 | .dumpit: |
1545 | DEBUGF 1,"TCP_input: dumping\n" |
||
1733 | hidnplayr | 1546 | |
2390 | hidnplayr | 1547 | call kernel_free |
1548 | add esp, 4 |
||
2942 | hidnplayr | 1549 | |
2390 | hidnplayr | 1550 | ret |
1733 | hidnplayr | 1551 | |
1552 | |||
1553 | .respond_ack: |
||
2390 | hidnplayr | 1554 | push ebx |
1555 | mov cl, TH_RST |
||
3143 | hidnplayr | 1556 | call TCP_respond |
2390 | hidnplayr | 1557 | pop ebx |
1558 | jmp .destroy_new_socket |
||
1733 | hidnplayr | 1559 | |
1560 | |||
1561 | .respond_syn: |
||
2390 | hidnplayr | 1562 | push ebx |
1563 | mov cl, TH_RST + TH_ACK |
||
3143 | hidnplayr | 1564 | call TCP_respond |
2390 | hidnplayr | 1565 | pop ebx |
1566 | jmp .destroy_new_socket |
||
1733 | hidnplayr | 1567 | |
1568 | |||
1569 | |||
1570 | ;----- |
||
1571 | ; Drop |
||
1572 | |||
2930 | hidnplayr | 1573 | .drop: |
1733 | hidnplayr | 1574 | |
2937 | hidnplayr | 1575 | DEBUGF 1,"TCP_input: Dropping packet\n" |
1576 | |||
2402 | hidnplayr | 1577 | pusha |
1578 | lea ecx, [ebx + SOCKET.mutex] |
||
1579 | call mutex_unlock |
||
1580 | popa |
||
1733 | hidnplayr | 1581 | |
2937 | hidnplayr | 1582 | .destroy_new_socket: |
1733 | hidnplayr | 1583 | |
2937 | hidnplayr | 1584 | test [ebx + TCP_SOCKET.temp_bits], TCP_BIT_DROPSOCKET |
1585 | jz .drop_no_socket |
||
1733 | hidnplayr | 1586 | |
2937 | hidnplayr | 1587 | mov eax, ebx |
1588 | call SOCKET_free |
||
1733 | hidnplayr | 1589 | |
2930 | hidnplayr | 1590 | .drop_no_socket: |
1591 | DEBUGF 1,"TCP_input: Drop (no socket)\n" |
||
1592 | |||
2390 | hidnplayr | 1593 | call kernel_free |
1594 | add esp, 4 |
||
2942 | hidnplayr | 1595 | |
2600 | hidnplayr | 1596 | ret |
1597 | |||
2930 | hidnplayr | 1598 | .drop_with_reset_no_socket: |
2600 | hidnplayr | 1599 | |
2891 | hidnplayr | 1600 | DEBUGF 1,"TCP_input: Drop with reset (no socket)\n" |
2600 | hidnplayr | 1601 | |
1602 | test [edx + TCP_header.Flags], TH_RST |
||
1603 | jnz .drop_no_socket |
||
1604 | |||
1605 | ;;; if its a multicast/broadcast, also drop |
||
1606 | |||
1607 | test [edx + TCP_header.Flags], TH_ACK |
||
1608 | jnz .respond_seg_ack |
||
1609 | |||
1610 | test [edx + TCP_header.Flags], TH_SYN |
||
1611 | jnz .respond_seg_syn |
||
1612 | |||
2930 | hidnplayr | 1613 | jmp .drop_no_socket |
2600 | hidnplayr | 1614 | |
1615 | .respond_seg_ack: |
||
1616 | |||
1617 | mov cl, TH_RST |
||
1618 | call TCP_respond_segment |
||
1619 | jmp .drop_no_socket |
||
1620 | |||
1621 | .respond_seg_syn: |
||
1622 | |||
1623 | mov cl, TH_RST + TH_ACK |
||
1624 | call TCP_respond_segment |
||
1625 | jmp .drop_no_socket |