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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: 3275 $ |
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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 | |||
3275 | hidnplayr | 57 | inc [TCP_segments_missed] ; FIXME: use correct interface |
58 | |||
3251 | hidnplayr | 59 | add esp, sizeof.TCP_queue_entry - 8 |
60 | call kernel_free |
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61 | add esp, 4 |
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62 | .done: |
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63 | ret |
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64 | |||
65 | |||
66 | |||
67 | align 4 |
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68 | TCP_process_input: |
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69 | |||
70 | .loop: |
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71 | get_from_queue TCP_queue, TCP_QUEUE_SIZE, sizeof.TCP_queue_entry, TCP_input.done |
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72 | |||
73 | push .loop |
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74 | push [esi + TCP_queue_entry.buffer_size] |
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75 | push [esi + TCP_queue_entry.buffer_ptr] |
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76 | |||
77 | mov ebx, [esi + TCP_queue_entry.device_ptr] |
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78 | mov ecx, [esi + TCP_queue_entry.segment_size] |
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79 | mov edi, [esi + TCP_queue_entry.ip_ptr] |
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80 | mov esi, [esi + TCP_queue_entry.segment_ptr] ; change esi last |
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81 | |||
82 | ;----------------------------------------------------------------- |
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83 | ; |
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84 | ; IN: [esp] = ptr to buffer |
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3252 | hidnplayr | 85 | ; [esp+4] = timestamp when segment was received |
3251 | hidnplayr | 86 | ; ebx = ptr to device struct |
87 | ; ecx = segment size |
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88 | ; esi = ptr to TCP segment |
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89 | ; edi = ptr to ipv4 source address, followed by ipv4 dest address |
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90 | ; |
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91 | ; OUT: / |
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92 | ; |
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93 | ;----------------------------------------------------------------- |
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94 | |||
2957 | hidnplayr | 95 | DEBUGF 1,"TCP_input: size=%u time=%d\n", ecx, [timer_ticks] |
1733 | hidnplayr | 96 | |
3252 | hidnplayr | 97 | ; re-calculate the checksum (if not already done by hw) |
2930 | hidnplayr | 98 | ; test [ebx + NET_DEVICE.hwacc], HWACC_TCP_IPv4_IN |
99 | ; jnz .checksum_ok |
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100 | |||
2390 | hidnplayr | 101 | push ecx esi |
102 | pushw [esi + TCP_header.Checksum] |
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103 | mov [esi + TCP_header.Checksum], 0 |
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104 | TCP_checksum (edi), (edi+4) |
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2937 | hidnplayr | 105 | pop cx ; previous checksum |
2390 | hidnplayr | 106 | cmp cx, dx |
107 | pop edx ecx |
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2600 | hidnplayr | 108 | jne .drop_no_socket |
2930 | hidnplayr | 109 | .checksum_ok: |
1733 | hidnplayr | 110 | |
2930 | hidnplayr | 111 | ; Verify the data offset |
2390 | hidnplayr | 112 | and [edx + TCP_header.DataOffset], 0xf0 ; Calculate TCP segment header size (throwing away unused reserved bits in TCP header) |
113 | shr [edx + TCP_header.DataOffset], 2 |
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114 | 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 | 115 | jb .drop_no_socket ; If not, drop the packet |
1733 | hidnplayr | 116 | |
2390 | hidnplayr | 117 | movzx eax, [edx + TCP_header.DataOffset] |
118 | sub ecx, eax ; substract TCP header size from total segment size |
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2600 | hidnplayr | 119 | jb .drop_no_socket ; If total segment size is less then the advertised header size, drop packet |
2891 | hidnplayr | 120 | DEBUGF 1,"TCP_input: %u bytes of data\n", ecx |
1733 | hidnplayr | 121 | |
122 | ;------------------------------------------- |
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123 | ; Convert Big-endian values to little endian |
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124 | |||
2390 | hidnplayr | 125 | ntohd [edx + TCP_header.SequenceNumber] |
126 | ntohd [edx + TCP_header.AckNumber] |
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1733 | hidnplayr | 127 | |
2390 | hidnplayr | 128 | ntohw [edx + TCP_header.Window] |
129 | ntohw [edx + TCP_header.UrgentPointer] |
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1733 | hidnplayr | 130 | |
2930 | hidnplayr | 131 | ;------------------------ |
132 | ; Find the socket pointer |
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1733 | hidnplayr | 133 | |
134 | ; IP Packet TCP Destination Port = local Port |
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135 | ; (IP Packet SenderAddress = Remote IP) OR (Remote IP = 0) |
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2309 | hidnplayr | 136 | ; (IP Packet TCP Source Port = remote Port) OR (remote Port = 0) |
1733 | hidnplayr | 137 | |
2937 | hidnplayr | 138 | .findpcb: |
2390 | hidnplayr | 139 | mov ebx, net_sockets |
140 | mov si, [edx + TCP_header.DestinationPort] |
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1733 | hidnplayr | 141 | |
142 | .socket_loop: |
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2390 | hidnplayr | 143 | mov ebx, [ebx + SOCKET.NextPtr] |
144 | or ebx, ebx |
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3275 | hidnplayr | 145 | jz .respond_seg_reset |
1733 | hidnplayr | 146 | |
2390 | hidnplayr | 147 | cmp [ebx + SOCKET.Domain], AF_INET4 |
148 | jne .socket_loop |
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1733 | hidnplayr | 149 | |
2390 | hidnplayr | 150 | cmp [ebx + SOCKET.Protocol], IP_PROTO_TCP |
151 | jne .socket_loop |
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1733 | hidnplayr | 152 | |
2390 | hidnplayr | 153 | cmp [ebx + TCP_SOCKET.LocalPort], si |
154 | jne .socket_loop |
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1733 | hidnplayr | 155 | |
2390 | hidnplayr | 156 | mov eax, [ebx + IP_SOCKET.RemoteIP] |
157 | cmp eax, [edi] ; Ipv4 source addres |
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158 | je @f |
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159 | test eax, eax |
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160 | jnz .socket_loop |
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1733 | hidnplayr | 161 | @@: |
162 | |||
2390 | hidnplayr | 163 | mov ax, [ebx + TCP_SOCKET.RemotePort] |
164 | cmp [edx + TCP_header.SourcePort], ax |
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165 | je .found_socket |
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166 | test ax, ax |
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167 | jnz .socket_loop |
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168 | .found_socket: ; ebx now contains the socketpointer |
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2891 | hidnplayr | 169 | 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 | 170 | |
2930 | hidnplayr | 171 | ;------------- |
2890 | hidnplayr | 172 | ; update stats |
2930 | hidnplayr | 173 | |
2890 | hidnplayr | 174 | inc [TCP_segments_rx] ; FIXME: correct interface? |
1733 | hidnplayr | 175 | |
176 | ;---------------------------- |
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177 | ; Check if socket isnt closed |
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178 | |||
2390 | hidnplayr | 179 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
2937 | hidnplayr | 180 | je .drop_no_socket |
1733 | hidnplayr | 181 | |
182 | ;---------------- |
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183 | ; Lock the socket |
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184 | |||
2402 | hidnplayr | 185 | pusha |
186 | lea ecx, [ebx + SOCKET.mutex] |
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187 | call mutex_lock |
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188 | popa |
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1830 | hidnplayr | 189 | |
2891 | hidnplayr | 190 | DEBUGF 1,"TCP_input: socket locked\n" |
1733 | hidnplayr | 191 | |
2937 | hidnplayr | 192 | ;--------------------------- |
193 | ; disable all temporary bits |
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2891 | hidnplayr | 194 | |
2937 | hidnplayr | 195 | mov [ebx + TCP_SOCKET.temp_bits], 0 |
2891 | hidnplayr | 196 | |
1733 | hidnplayr | 197 | ;--------------------------------------- |
198 | ; unscale the window into a 32 bit value |
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199 | |||
2390 | hidnplayr | 200 | movzx eax, [edx + TCP_header.Window] |
201 | push ecx |
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202 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
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203 | shl eax, cl |
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204 | mov dword [edx + TCP_header.Window], eax ; word after window is checksum, we dont need checksum anymore |
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205 | pop ecx |
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1733 | hidnplayr | 206 | |
2930 | hidnplayr | 207 | ;--------------------------------------- |
208 | ; Are we accepting incoming connections? |
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1733 | hidnplayr | 209 | |
2390 | hidnplayr | 210 | test [ebx + SOCKET.options], SO_ACCEPTCON |
2954 | hidnplayr | 211 | jz .no_accept |
1733 | hidnplayr | 212 | |
2954 | hidnplayr | 213 | DEBUGF 1,"TCP_input: Accepting new connection\n" |
214 | |||
215 | pusha |
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216 | lea ecx, [ebx + SOCKET.mutex] |
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217 | call mutex_unlock |
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218 | popa |
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219 | |||
220 | push ecx edx esi edi ;;; |
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221 | call SOCKET_fork |
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222 | pop edi esi edx ecx |
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223 | |||
224 | test eax, eax |
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225 | jz .drop_no_socket |
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226 | |||
227 | mov ebx, eax |
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228 | |||
229 | mov [ebx + TCP_SOCKET.temp_bits], TCP_BIT_DROPSOCKET ;;; FIXME: should we take over bits from previous socket? |
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230 | |||
231 | push dword [edi + 4] ; Ipv4 destination addres |
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232 | pop [ebx + IP_SOCKET.LocalIP] |
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233 | |||
234 | push [edx + TCP_header.DestinationPort] |
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235 | pop [ebx + TCP_SOCKET.LocalPort] |
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236 | |||
237 | mov [ebx + TCP_SOCKET.t_state], TCPS_LISTEN |
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238 | .no_accept: |
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239 | |||
240 | |||
1733 | hidnplayr | 241 | ;------------------------------------- |
242 | ; Reset idle timer and keepalive timer |
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243 | |||
2390 | hidnplayr | 244 | mov [ebx + TCP_SOCKET.t_idle], 0 |
3143 | hidnplayr | 245 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_idle |
1733 | hidnplayr | 246 | |
247 | ;-------------------- |
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248 | ; Process TCP options |
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249 | |||
3275 | hidnplayr | 250 | push ecx |
2954 | hidnplayr | 251 | |
252 | movzx ecx, [edx + TCP_header.DataOffset] |
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253 | cmp ecx, sizeof.TCP_header ; Does header contain any options? |
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2390 | hidnplayr | 254 | je .no_options |
1733 | hidnplayr | 255 | |
2891 | hidnplayr | 256 | DEBUGF 1,"TCP_input: Segment has options\n" |
1733 | hidnplayr | 257 | |
2954 | hidnplayr | 258 | ;;; FIXME: for LISTEN, options should be called after we determined route, we need it for MSS |
259 | ;;; cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN ; no options when in listen state |
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260 | ;;; jz .not_uni_xfer ; also no header prediction |
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1733 | hidnplayr | 261 | |
2954 | hidnplayr | 262 | add ecx, edx |
2390 | hidnplayr | 263 | lea esi, [edx + sizeof.TCP_header] |
1733 | hidnplayr | 264 | |
265 | .opt_loop: |
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2954 | hidnplayr | 266 | cmp esi, ecx ; are we scanning outside of header? |
2390 | hidnplayr | 267 | jae .no_options |
2954 | hidnplayr | 268 | lodsb |
269 | cmp al, TCP_OPT_EOL ; end of option list? |
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270 | je .no_options |
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271 | cmp al, TCP_OPT_NOP |
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272 | je .opt_loop |
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273 | cmp al, TCP_OPT_MAXSEG |
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2390 | hidnplayr | 274 | je .opt_maxseg |
2954 | hidnplayr | 275 | cmp al, TCP_OPT_WINDOW |
2390 | hidnplayr | 276 | je .opt_window |
2954 | hidnplayr | 277 | cmp al, TCP_OPT_SACK_PERMIT |
278 | je .opt_sack_permit |
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279 | ; cmp al, TCP_OPT_SACK |
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280 | ; je .opt_sack |
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281 | cmp al, TCP_OPT_TIMESTAMP |
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2390 | hidnplayr | 282 | je .opt_timestamp |
2954 | hidnplayr | 283 | DEBUGF 1,"TCP_input: unknown option:%u\n", al |
2937 | hidnplayr | 284 | jmp .no_options ; If we reach here, some unknown options were received, skip them all! |
1733 | hidnplayr | 285 | |
286 | .opt_maxseg: |
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2954 | hidnplayr | 287 | lodsb |
288 | cmp al, 4 |
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2937 | hidnplayr | 289 | jne .no_options ; error occured, ignore all options! |
1733 | hidnplayr | 290 | |
2390 | hidnplayr | 291 | test [edx + TCP_header.Flags], TH_SYN |
292 | jz @f |
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1733 | hidnplayr | 293 | |
2954 | hidnplayr | 294 | lodsw |
2390 | hidnplayr | 295 | rol ax, 8 |
2891 | hidnplayr | 296 | DEBUGF 1,"TCP_input: Maxseg=%u\n", ax |
3144 | hidnplayr | 297 | call TCP_mss |
1733 | hidnplayr | 298 | @@: |
2390 | hidnplayr | 299 | jmp .opt_loop |
1733 | hidnplayr | 300 | |
301 | |||
302 | .opt_window: |
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2954 | hidnplayr | 303 | lodsb |
304 | cmp al, 3 |
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2390 | hidnplayr | 305 | jne .no_options |
1733 | hidnplayr | 306 | |
2390 | hidnplayr | 307 | test [edx + TCP_header.Flags], TH_SYN |
308 | jz @f |
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1733 | hidnplayr | 309 | |
2954 | hidnplayr | 310 | DEBUGF 1,"TCP_input: Got window scale option\n" |
311 | or [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
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1733 | hidnplayr | 312 | |
2954 | hidnplayr | 313 | lodsb |
314 | mov [ebx + TCP_SOCKET.SND_SCALE], al |
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315 | ;;;;; TODO |
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316 | |||
1733 | hidnplayr | 317 | @@: |
2390 | hidnplayr | 318 | jmp .opt_loop |
1733 | hidnplayr | 319 | |
320 | |||
2954 | hidnplayr | 321 | .opt_sack_permit: |
322 | lodsb |
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323 | cmp al, 2 |
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324 | jne .no_options |
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325 | |||
326 | test [edx + TCP_header.Flags], TH_SYN |
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327 | jz @f |
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328 | |||
329 | DEBUGF 1,"TCP_input: Selective Acknowledgement permitted\n" |
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330 | or [ebx + TCP_SOCKET.t_flags], TF_SACK_PERMIT |
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331 | |||
332 | @@: |
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333 | jmp .opt_loop |
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334 | |||
335 | |||
1733 | hidnplayr | 336 | .opt_timestamp: |
2954 | hidnplayr | 337 | lodsb |
338 | cmp al, 10 ; length must be 10 |
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2390 | hidnplayr | 339 | jne .no_options |
1733 | hidnplayr | 340 | |
2891 | hidnplayr | 341 | DEBUGF 1,"TCP_input: Got timestamp option\n" |
1733 | hidnplayr | 342 | |
2954 | hidnplayr | 343 | test [edx + TCP_header.Flags], TH_SYN |
344 | jz @f |
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345 | or [ebx + TCP_SOCKET.t_flags], TF_RCVD_TSTMP |
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346 | @@: |
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347 | |||
348 | lodsd |
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349 | mov [ebx + TCP_SOCKET.ts_val], eax |
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350 | lodsd ; timestamp echo reply |
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351 | mov [ebx + TCP_SOCKET.ts_ecr], eax |
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2937 | hidnplayr | 352 | or [ebx + TCP_SOCKET.temp_bits], TCP_BIT_TIMESTAMP |
2930 | hidnplayr | 353 | |
2946 | hidnplayr | 354 | ; Since we have a timestamp, lets do the paws test right away! |
355 | |||
356 | test [edx + TCP_header.Flags], TH_RST |
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357 | jnz .no_paws |
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358 | |||
359 | mov eax, [ebx + TCP_SOCKET.ts_recent] |
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360 | test eax, eax |
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361 | jz .no_paws |
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362 | cmp eax, [ebx + TCP_SOCKET.ts_val] |
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363 | jge .no_paws |
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364 | |||
365 | DEBUGF 1,"TCP_input: PAWS: detected an old segment\n" |
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366 | |||
3251 | hidnplayr | 367 | mov eax, [esp+4+4] ; tcp_now |
2946 | hidnplayr | 368 | sub eax, [ebx + TCP_SOCKET.ts_recent_age] |
3252 | hidnplayr | 369 | |
370 | pop ecx |
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2946 | hidnplayr | 371 | cmp eax, TCP_PAWS_IDLE |
2947 | hidnplayr | 372 | jle .drop_after_ack ; TODO: update stats |
3252 | hidnplayr | 373 | push ecx |
2946 | hidnplayr | 374 | |
375 | mov [ebx + TCP_SOCKET.ts_recent], 0 ; timestamp was invalid, fix it. |
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376 | .no_paws: |
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2390 | hidnplayr | 377 | jmp .opt_loop |
1733 | hidnplayr | 378 | |
379 | .no_options: |
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380 | |||
3275 | hidnplayr | 381 | pop ecx |
2954 | hidnplayr | 382 | |
1733 | hidnplayr | 383 | ;----------------------------------------------------------------------- |
384 | ; Time to do some header prediction (Original Principle by Van Jacobson) |
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385 | |||
386 | ; There are two common cases for an uni-directional data transfer. |
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387 | ; |
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388 | ; General rule: the packets has no control flags, is in-sequence, |
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389 | ; window width didnt change and we're not retransmitting. |
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390 | ; |
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391 | ; Second rules: |
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392 | ; - If the length is 0 and the ACK moved forward, we're the sender side of the transfer. |
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393 | ; 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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394 | ; |
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395 | ; - If the length is not 0 and the ACK didn't move, we're the receiver side of the transfer. |
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396 | ; 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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397 | |||
2390 | hidnplayr | 398 | cmp [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
399 | jnz .not_uni_xfer |
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1733 | hidnplayr | 400 | |
2390 | hidnplayr | 401 | test [edx + TCP_header.Flags], TH_SYN + TH_FIN + TH_RST + TH_URG |
402 | jnz .not_uni_xfer |
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1733 | hidnplayr | 403 | |
2390 | hidnplayr | 404 | test [edx + TCP_header.Flags], TH_ACK |
405 | jz .not_uni_xfer |
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1733 | hidnplayr | 406 | |
2390 | hidnplayr | 407 | mov eax, [edx + TCP_header.SequenceNumber] |
408 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
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409 | jne .not_uni_xfer |
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1733 | hidnplayr | 410 | |
2390 | hidnplayr | 411 | mov eax, dword [edx + TCP_header.Window] |
412 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
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413 | jne .not_uni_xfer |
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1733 | hidnplayr | 414 | |
2390 | hidnplayr | 415 | mov eax, [ebx + TCP_SOCKET.SND_NXT] |
416 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
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417 | jne .not_uni_xfer |
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1733 | hidnplayr | 418 | |
419 | ;--------------------------------------- |
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420 | ; check if we are sender in the uni-xfer |
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421 | |||
422 | ; If the following 4 conditions are all true, this segment is a pure ACK. |
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423 | ; |
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424 | ; - The segment contains no data. |
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2390 | hidnplayr | 425 | test ecx, ecx |
426 | jnz .not_sender |
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1733 | hidnplayr | 427 | |
428 | ; - The congestion window is greater than or equal to the current send window. |
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429 | ; 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 | 430 | mov eax, [ebx + TCP_SOCKET.SND_CWND] |
431 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
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432 | jb .not_uni_xfer |
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1733 | hidnplayr | 433 | |
434 | ; - The acknowledgment field in the segment is less than or equal to the maximum sequence number sent. |
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2390 | hidnplayr | 435 | mov eax, [edx + TCP_header.AckNumber] |
436 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
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437 | ja .not_uni_xfer |
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1733 | hidnplayr | 438 | |
439 | ; - The acknowledgment field in the segment is greater than the largest unacknowledged sequence number. |
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2390 | hidnplayr | 440 | sub eax, [ebx + TCP_SOCKET.SND_UNA] |
441 | jbe .not_uni_xfer |
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1733 | hidnplayr | 442 | |
2891 | hidnplayr | 443 | DEBUGF 1,"TCP_input: Header prediction: we are sender\n" |
1733 | hidnplayr | 444 | |
445 | ;--------------------------------- |
||
446 | ; Packet is a pure ACK, process it |
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447 | |||
448 | ; Delete acknowledged bytes from send buffer |
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2390 | hidnplayr | 449 | pusha |
450 | mov ecx, eax |
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451 | lea eax, [ebx + STREAM_SOCKET.snd] |
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452 | call SOCKET_ring_free |
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453 | popa |
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1733 | hidnplayr | 454 | |
2930 | hidnplayr | 455 | ; Update RTT estimators |
456 | |||
2937 | hidnplayr | 457 | test [ebx + TCP_SOCKET.temp_bits], TCP_BIT_TIMESTAMP |
458 | jz .no_timestamp_rtt |
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3251 | hidnplayr | 459 | mov eax, [esp + 4] ; timestamp when this segment was received |
2937 | hidnplayr | 460 | sub eax, [ebx + TCP_SOCKET.ts_ecr] |
461 | inc eax |
||
462 | call TCP_xmit_timer |
||
463 | jmp .rtt_done |
||
2930 | hidnplayr | 464 | |
2937 | hidnplayr | 465 | .no_timestamp_rtt: |
466 | cmp [ebx + TCP_SOCKET.t_rtt], 0 |
||
467 | je .rtt_done |
||
468 | mov eax, [edx + TCP_header.AckNumber] |
||
469 | cmp eax, [ebx + TCP_SOCKET.t_rtseq] |
||
470 | jbe .rtt_done |
||
471 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
||
472 | call TCP_xmit_timer |
||
2930 | hidnplayr | 473 | |
2937 | hidnplayr | 474 | .rtt_done: |
475 | |||
1733 | hidnplayr | 476 | ; update window pointers |
2390 | hidnplayr | 477 | mov eax, [edx + TCP_header.AckNumber] |
478 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
1733 | hidnplayr | 479 | |
480 | ; Stop retransmit timer |
||
2390 | hidnplayr | 481 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 |
1733 | hidnplayr | 482 | |
3275 | hidnplayr | 483 | ; Unlock the socket |
2402 | hidnplayr | 484 | pusha |
485 | lea ecx, [ebx + SOCKET.mutex] |
||
486 | call mutex_unlock |
||
487 | popa |
||
488 | |||
3275 | hidnplayr | 489 | ; Awaken waiting processes |
2390 | hidnplayr | 490 | mov eax, ebx |
3257 | hidnplayr | 491 | call SOCKET_notify |
1733 | hidnplayr | 492 | |
1763 | hidnplayr | 493 | ; Generate more output |
2390 | hidnplayr | 494 | call TCP_output |
1733 | hidnplayr | 495 | |
2937 | hidnplayr | 496 | jmp .drop_no_socket |
1763 | hidnplayr | 497 | |
1733 | hidnplayr | 498 | ;------------------------------------------------- |
499 | ; maybe we are the receiver in the uni-xfer then.. |
||
500 | |||
501 | .not_sender: |
||
502 | ; - The amount of data in the segment is greater than 0 (data count is in ecx) |
||
503 | |||
504 | ; - The acknowledgment field equals the largest unacknowledged sequence number. This means no data is acknowledged by this segment. |
||
2390 | hidnplayr | 505 | mov eax, [edx + TCP_header.AckNumber] |
506 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
507 | jne .not_uni_xfer |
||
1733 | hidnplayr | 508 | |
509 | ; - The reassembly list of out-of-order segments for the connection is empty (seg_next equals tp). |
||
510 | |||
511 | ;;; TODO |
||
512 | |||
2930 | hidnplayr | 513 | ; jnz .not_uni_xfer |
1733 | hidnplayr | 514 | |
515 | ; Complete processing of received data |
||
516 | |||
2891 | hidnplayr | 517 | DEBUGF 1,"TCP_input: Header prediction: we are receiving %u bytes\n", ecx |
1733 | hidnplayr | 518 | |
2390 | hidnplayr | 519 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
1763 | hidnplayr | 520 | |
2390 | hidnplayr | 521 | movzx esi, [edx + TCP_header.DataOffset] |
522 | add esi, edx |
||
523 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
524 | call SOCKET_ring_write ; Add the data to the socket buffer |
||
1733 | hidnplayr | 525 | |
2390 | hidnplayr | 526 | mov eax, ebx |
3257 | hidnplayr | 527 | call SOCKET_notify |
1733 | hidnplayr | 528 | |
2390 | hidnplayr | 529 | or [ebx + TCP_SOCKET.t_flags], TF_DELACK ; Set delayed ack flag |
1733 | hidnplayr | 530 | |
2390 | hidnplayr | 531 | jmp .drop |
1733 | hidnplayr | 532 | |
533 | ;-------------------------------------------------- |
||
534 | ; Header prediction failed, do it the slow way |
||
535 | |||
536 | .not_uni_xfer: |
||
537 | |||
2891 | hidnplayr | 538 | DEBUGF 1,"TCP_input: Header prediction failed\n" |
1733 | hidnplayr | 539 | |
540 | ; Calculate receive window size |
||
541 | |||
2942 | hidnplayr | 542 | push edx |
2937 | hidnplayr | 543 | mov eax, SOCKETBUFFSIZE |
544 | sub eax, [ebx + STREAM_SOCKET.rcv.size] |
||
545 | mov edx, [ebx + TCP_SOCKET.RCV_ADV] |
||
546 | sub edx, [ebx + TCP_SOCKET.RCV_NXT] |
||
547 | cmp eax, edx |
||
2942 | hidnplayr | 548 | jg @f |
2937 | hidnplayr | 549 | mov eax, edx |
550 | @@: |
||
2957 | hidnplayr | 551 | DEBUGF 1,"Receive window size=%d\n", eax |
552 | mov [ebx + TCP_SOCKET.RCV_WND], eax |
||
2942 | hidnplayr | 553 | pop edx |
1733 | hidnplayr | 554 | |
3275 | hidnplayr | 555 | ; If we are in listen or syn_sent state, go to that specific code right away |
2937 | hidnplayr | 556 | |
2390 | hidnplayr | 557 | cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN |
558 | je .LISTEN |
||
1733 | hidnplayr | 559 | |
2390 | hidnplayr | 560 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_SENT |
561 | je .SYN_SENT |
||
1733 | hidnplayr | 562 | |
563 | ;---------------------------- |
||
564 | ; trim any data not in window |
||
565 | |||
566 | ; check for duplicate data at beginning of segment |
||
567 | |||
2390 | hidnplayr | 568 | mov eax, [ebx + TCP_SOCKET.RCV_NXT] |
569 | sub eax, [edx + TCP_header.SequenceNumber] |
||
2942 | hidnplayr | 570 | jle .no_duplicate |
1733 | hidnplayr | 571 | |
2891 | hidnplayr | 572 | DEBUGF 1,"TCP_input: %u bytes duplicate data!\n", eax |
1763 | hidnplayr | 573 | |
2390 | hidnplayr | 574 | test [edx + TCP_header.Flags], TH_SYN |
575 | jz .no_dup_syn |
||
1733 | hidnplayr | 576 | |
2942 | hidnplayr | 577 | DEBUGF 1,"TCP_input: got duplicate syn\n" |
1733 | hidnplayr | 578 | |
2390 | hidnplayr | 579 | and [edx + TCP_header.Flags], not (TH_SYN) |
580 | inc [edx + TCP_header.SequenceNumber] |
||
1733 | hidnplayr | 581 | |
2390 | hidnplayr | 582 | cmp [edx + TCP_header.UrgentPointer], 1 |
583 | jbe @f |
||
584 | dec [edx + TCP_header.UrgentPointer] |
||
585 | jmp .dup_syn |
||
1733 | hidnplayr | 586 | @@: |
2390 | hidnplayr | 587 | and [edx + TCP_header.Flags], not (TH_URG) |
1838 | hidnplayr | 588 | .dup_syn: |
2390 | hidnplayr | 589 | dec eax |
1763 | hidnplayr | 590 | .no_dup_syn: |
1733 | hidnplayr | 591 | |
2937 | hidnplayr | 592 | ; Check for entire duplicate segment |
593 | cmp eax, ecx ; eax holds number of bytes to drop, ecx is data size |
||
594 | jb .duplicate |
||
595 | jnz @f |
||
2390 | hidnplayr | 596 | test [edx + TCP_header.Flags], TH_FIN |
2937 | hidnplayr | 597 | jnz .duplicate |
598 | @@: |
||
1733 | hidnplayr | 599 | |
2937 | hidnplayr | 600 | ; Any valid FIN must be to the left of the window. |
601 | ; At this point the FIN must be out of sequence or a duplicate, drop it |
||
2390 | hidnplayr | 602 | and [edx + TCP_header.Flags], not TH_FIN |
2937 | hidnplayr | 603 | |
604 | ; send an ACK and resynchronize and drop any data. |
||
605 | ; But keep on processing for RST or ACK |
||
2390 | hidnplayr | 606 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
2937 | hidnplayr | 607 | mov eax, ecx |
608 | ;TODO: update stats |
||
1733 | hidnplayr | 609 | |
610 | ;----------------------------------------------- |
||
611 | ; Remove duplicate data and update urgent offset |
||
612 | |||
2937 | hidnplayr | 613 | .duplicate: |
614 | ;;; TODO: 677 |
||
2390 | hidnplayr | 615 | add [edx + TCP_header.SequenceNumber], eax |
2937 | hidnplayr | 616 | sub ecx, eax |
1733 | hidnplayr | 617 | |
2390 | hidnplayr | 618 | sub [edx + TCP_header.UrgentPointer], ax |
2942 | hidnplayr | 619 | jg @f |
2390 | hidnplayr | 620 | and [edx + TCP_header.Flags], not (TH_URG) |
621 | mov [edx + TCP_header.UrgentPointer], 0 |
||
1733 | hidnplayr | 622 | @@: |
623 | |||
624 | ;-------------------------------------------------- |
||
625 | ; Handle data that arrives after process terminates |
||
626 | |||
2937 | hidnplayr | 627 | .no_duplicate: |
2390 | hidnplayr | 628 | cmp [ebx + SOCKET.PID], 0 |
2937 | hidnplayr | 629 | jne .not_terminated |
2390 | hidnplayr | 630 | cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
2937 | hidnplayr | 631 | jbe .not_terminated |
2390 | hidnplayr | 632 | test ecx, ecx |
2937 | hidnplayr | 633 | jz .not_terminated |
1733 | hidnplayr | 634 | |
2937 | hidnplayr | 635 | mov eax, ebx |
636 | call TCP_close |
||
637 | ;;;TODO: update stats |
||
3275 | hidnplayr | 638 | jmp .respond_seg_reset |
1733 | hidnplayr | 639 | |
640 | ;---------------------------------------- |
||
2937 | hidnplayr | 641 | ; Remove data beyond right edge of window (700-736) |
1733 | hidnplayr | 642 | |
2937 | hidnplayr | 643 | .not_terminated: |
2390 | hidnplayr | 644 | mov eax, [edx + TCP_header.SequenceNumber] |
645 | add eax, ecx |
||
646 | sub eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
2957 | hidnplayr | 647 | sub eax, [ebx + TCP_SOCKET.RCV_WND] ; eax now holds the number of bytes to drop |
2942 | hidnplayr | 648 | jle .no_excess_data |
1733 | hidnplayr | 649 | |
2942 | hidnplayr | 650 | DEBUGF 1,"%d bytes beyond right edge of window\n", eax |
651 | |||
1733 | hidnplayr | 652 | ;;; TODO: update stats |
2390 | hidnplayr | 653 | cmp eax, ecx |
2942 | hidnplayr | 654 | jl .dont_drop_all |
2937 | hidnplayr | 655 | ; If a new connection request is received while in TIME_WAIT, drop the old connection and start over, |
656 | ; if the sequence numbers are above the previous ones |
||
1733 | hidnplayr | 657 | |
2937 | hidnplayr | 658 | test [edx + TCP_header.Flags], TH_SYN |
659 | jz .no_new_request |
||
660 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
||
661 | jne .no_new_request |
||
2942 | hidnplayr | 662 | ; mov edx, [ebx + TCP_SOCKET.RCV_NXT] |
663 | ; cmp edx, [edx + TCP_header.SequenceNumber] |
||
664 | ; add edx, 64000 ; TCP_ISSINCR FIXME |
||
2937 | hidnplayr | 665 | mov eax, ebx |
666 | call TCP_close |
||
667 | jmp .findpcb ; FIXME: skip code for unscaling window, ... |
||
668 | .no_new_request: |
||
1733 | hidnplayr | 669 | |
2937 | hidnplayr | 670 | ; If window is closed can only take segments at window edge, and have to drop data and PUSH from |
671 | ; incoming segments. Continue processing, but remember to ACK. Otherwise drop segment and ACK |
||
672 | |||
673 | cmp [ebx + TCP_SOCKET.RCV_WND], 0 |
||
674 | jne .drop_after_ack |
||
675 | mov eax, [edx + TCP_header.SequenceNumber] |
||
676 | cmp eax, [ebx + TCP_SOCKET.RCV_NXT] |
||
677 | jne .drop_after_ack |
||
678 | |||
679 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
680 | ;;; TODO: update stats |
||
681 | jmp .no_excess_data |
||
1733 | hidnplayr | 682 | .dont_drop_all: |
2937 | hidnplayr | 683 | ;;; TODO: update stats |
684 | ;;; TODO: 733 |
||
2957 | hidnplayr | 685 | |
2937 | hidnplayr | 686 | sub ecx, eax |
687 | and [ebx + TCP_SOCKET.t_flags], not (TH_PUSH or TH_FIN) |
||
1733 | hidnplayr | 688 | .no_excess_data: |
689 | |||
2957 | hidnplayr | 690 | ;--------------------- FIXME ------------------- |
691 | |||
692 | pusha |
||
693 | movzx esi, [edx + TCP_header.DataOffset] |
||
694 | add esi, edx |
||
695 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
696 | call SOCKET_ring_write ; Add the data to the socket buffer |
||
697 | add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied |
||
698 | popa |
||
699 | |||
700 | ;--------------------- FIXME -------------------- |
||
701 | |||
1733 | hidnplayr | 702 | ;----------------- |
2948 | hidnplayr | 703 | ; Record timestamp (737-746) |
1733 | hidnplayr | 704 | |
2937 | hidnplayr | 705 | ; If last ACK falls within this segments sequence numbers, record its timestamp |
706 | test [ebx + TCP_SOCKET.temp_bits], TCP_BIT_TIMESTAMP |
||
707 | jz .no_timestamp |
||
708 | mov eax, [ebx + TCP_SOCKET.last_ack_sent] |
||
709 | sub eax, [edx + TCP_header.SequenceNumber] |
||
710 | jb .no_timestamp |
||
711 | test [ebx + TCP_header.Flags], TH_SYN or TH_FIN ; syn and fin occupy one byte |
||
712 | jz @f |
||
713 | dec eax |
||
714 | @@: |
||
715 | sub eax, ecx |
||
716 | jae .no_timestamp |
||
1733 | hidnplayr | 717 | |
2948 | hidnplayr | 718 | DEBUGF 1,"Recording timestamp\n" |
719 | |||
3251 | hidnplayr | 720 | mov eax, [esp + 4] ; tcp_now |
2937 | hidnplayr | 721 | mov [ebx + TCP_SOCKET.ts_recent_age], eax |
722 | mov eax, [ebx + TCP_SOCKET.ts_val] |
||
723 | mov [ebx + TCP_SOCKET.ts_recent], eax |
||
724 | .no_timestamp: |
||
1733 | hidnplayr | 725 | |
726 | ;------------------ |
||
727 | ; Process RST flags |
||
728 | |||
2390 | hidnplayr | 729 | test [edx + TCP_header.Flags], TH_RST |
2891 | hidnplayr | 730 | jz .no_rst |
1733 | hidnplayr | 731 | |
2891 | hidnplayr | 732 | DEBUGF 1,"TCP_input: Got an RST flag\n" |
1733 | hidnplayr | 733 | |
2390 | hidnplayr | 734 | mov eax, [ebx + TCP_SOCKET.t_state] |
735 | shl eax, 2 |
||
736 | jmp dword [eax + .rst_sw_list] |
||
1733 | hidnplayr | 737 | |
738 | .rst_sw_list: |
||
2891 | hidnplayr | 739 | dd .no_rst ; TCPS_CLOSED |
740 | dd .no_rst ; TCPS_LISTEN |
||
741 | dd .no_rst ; TCPS_SYN_SENT |
||
742 | dd .econnrefused ; TCPS_SYN_RECEIVED |
||
743 | dd .econnreset ; TCPS_ESTABLISHED |
||
744 | dd .econnreset ; TCPS_CLOSE_WAIT |
||
745 | dd .econnreset ; TCPS_FIN_WAIT_1 |
||
746 | dd .rst_close ; TCPS_CLOSING |
||
747 | dd .rst_close ; TCPS_LAST_ACK |
||
748 | dd .econnreset ; TCPS_FIN_WAIT_2 |
||
749 | dd .rst_close ; TCPS_TIMED_WAIT |
||
1733 | hidnplayr | 750 | |
751 | .econnrefused: |
||
2891 | hidnplayr | 752 | DEBUGF 1,"TCP_input: Connection refused\n" |
1733 | hidnplayr | 753 | |
2390 | hidnplayr | 754 | mov [ebx + SOCKET.errorcode], ECONNREFUSED |
755 | jmp .close |
||
1733 | hidnplayr | 756 | |
757 | .econnreset: |
||
2891 | hidnplayr | 758 | DEBUGF 1,"TCP_input: Connection reset\n" |
1733 | hidnplayr | 759 | |
2390 | hidnplayr | 760 | mov [ebx + SOCKET.errorcode], ECONNRESET |
1733 | hidnplayr | 761 | |
2882 | hidnplayr | 762 | .close: |
2891 | hidnplayr | 763 | DEBUGF 1,"TCP_input: Closing connection\n" |
1733 | hidnplayr | 764 | |
2390 | hidnplayr | 765 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSED |
2937 | hidnplayr | 766 | ;;; TODO: update stats (tcp drops) |
2390 | hidnplayr | 767 | mov eax, ebx |
768 | call TCP_close |
||
3270 | hidnplayr | 769 | jmp .drop_no_socket |
1733 | hidnplayr | 770 | |
771 | .rst_close: |
||
2891 | hidnplayr | 772 | DEBUGF 1,"TCP_input: Closing with reset\n" |
1733 | hidnplayr | 773 | |
2390 | hidnplayr | 774 | mov eax, ebx |
775 | call TCP_close |
||
3270 | hidnplayr | 776 | jmp .drop_no_socket |
1733 | hidnplayr | 777 | |
2891 | hidnplayr | 778 | .no_rst: |
1733 | hidnplayr | 779 | |
780 | ;-------------------------------------- |
||
781 | ; handle SYN-full and ACK-less segments |
||
782 | |||
2390 | hidnplayr | 783 | test [edx + TCP_header.Flags], TH_SYN |
2937 | hidnplayr | 784 | jz .not_syn_full |
1733 | hidnplayr | 785 | |
2390 | hidnplayr | 786 | mov eax, ebx |
787 | mov ebx, ECONNRESET |
||
788 | call TCP_drop |
||
789 | jmp .drop_with_reset |
||
2937 | hidnplayr | 790 | .not_syn_full: |
1733 | hidnplayr | 791 | |
792 | ;--------------- |
||
793 | ; ACK processing |
||
794 | |||
2891 | hidnplayr | 795 | test [edx + TCP_header.Flags], TH_ACK |
796 | jz .drop |
||
797 | |||
2390 | hidnplayr | 798 | cmp [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
2937 | hidnplayr | 799 | jb .ack_processed ; states: closed, listen, syn_sent |
800 | ja .no_syn_rcv ; established, fin_wait_1, fin_wait_2, close_wait, closing, last_ack, time_wait |
||
1733 | hidnplayr | 801 | |
2891 | hidnplayr | 802 | DEBUGF 1,"TCP_input: state=syn_received\n" |
1733 | hidnplayr | 803 | |
2390 | hidnplayr | 804 | mov eax, [edx + TCP_header.AckNumber] |
805 | cmp [ebx + TCP_SOCKET.SND_UNA], eax |
||
806 | ja .drop_with_reset |
||
807 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
808 | ja .drop_with_reset |
||
1733 | hidnplayr | 809 | |
2309 | hidnplayr | 810 | ;;; TODO: update stats |
811 | |||
2390 | hidnplayr | 812 | mov eax, ebx |
813 | call SOCKET_is_connected |
||
814 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
||
1831 | hidnplayr | 815 | |
816 | ; Do window scaling? |
||
817 | |||
2390 | hidnplayr | 818 | test [ebx + TCP_SOCKET.t_flags], TF_RCVD_SCALE |
819 | jz @f |
||
820 | test [ebx + TCP_SOCKET.t_flags], TF_REQ_SCALE |
||
821 | jz @f |
||
1831 | hidnplayr | 822 | |
2390 | hidnplayr | 823 | push word [ebx + TCP_SOCKET.requested_s_scale] ; Set send and receive scale factors to the received values |
824 | pop word [ebx + TCP_SOCKET.SND_SCALE] |
||
1831 | hidnplayr | 825 | @@: |
826 | |||
2891 | hidnplayr | 827 | ;;; TODO: call TCP_reassemble |
1831 | hidnplayr | 828 | |
2390 | hidnplayr | 829 | mov eax, [edx + TCP_header.SequenceNumber] |
830 | dec eax |
||
831 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
1831 | hidnplayr | 832 | |
1733 | hidnplayr | 833 | .no_syn_rcv: |
834 | |||
2937 | hidnplayr | 835 | ;------------------------- |
836 | ; check for duplicate ACKs |
||
1733 | hidnplayr | 837 | |
2390 | hidnplayr | 838 | mov eax, [edx + TCP_header.AckNumber] |
839 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
840 | ja .not_dup_ack |
||
1733 | hidnplayr | 841 | |
2390 | hidnplayr | 842 | test ecx, ecx |
843 | jnz .reset_dupacks |
||
1733 | hidnplayr | 844 | |
2390 | hidnplayr | 845 | mov eax, dword [edx + TCP_header.Window] |
846 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
847 | jne .reset_dupacks |
||
1733 | hidnplayr | 848 | |
2891 | hidnplayr | 849 | DEBUGF 1,"TCP_input: Processing duplicate ACK\n" |
1733 | hidnplayr | 850 | |
2948 | hidnplayr | 851 | ; If we have outstanding data, other than a window probe, this is a completely duplicate ACK |
2937 | hidnplayr | 852 | ; (window info didnt change) The ACK is the biggest we've seen and we've seen exactly our rexmt threshold of them, |
853 | ; assume a packet has been dropped and retransmit it. Kludge snd_nxt & the congestion window so we send only this one packet. |
||
1733 | hidnplayr | 854 | |
2937 | hidnplayr | 855 | cmp [ebx + TCP_SOCKET.timer_retransmission], 0 ;;;; FIXME |
856 | jg @f |
||
857 | |||
2390 | hidnplayr | 858 | mov eax, [edx + TCP_header.AckNumber] |
859 | cmp eax, [ebx + TCP_SOCKET.SND_UNA] |
||
860 | je .dup_ack |
||
1763 | hidnplayr | 861 | |
862 | @@: |
||
2390 | hidnplayr | 863 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
864 | jmp .not_dup_ack |
||
1763 | hidnplayr | 865 | |
866 | .dup_ack: |
||
2390 | hidnplayr | 867 | inc [ebx + TCP_SOCKET.t_dupacks] |
868 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
||
869 | jne .no_re_xmit |
||
1763 | hidnplayr | 870 | |
2390 | hidnplayr | 871 | push [ebx + TCP_SOCKET.SND_NXT] ; >>>> |
1763 | hidnplayr | 872 | |
2390 | hidnplayr | 873 | mov eax, [ebx + TCP_SOCKET.SND_WND] |
874 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
||
2866 | hidnplayr | 875 | cmova eax, [ebx + TCP_SOCKET.SND_CWND] |
2390 | hidnplayr | 876 | shr eax, 1 |
877 | push edx |
||
878 | xor edx, edx |
||
879 | div [ebx + TCP_SOCKET.t_maxseg] |
||
880 | cmp eax, 2 |
||
2937 | hidnplayr | 881 | ja @f |
882 | xor eax, eax |
||
883 | mov al, 2 |
||
1763 | hidnplayr | 884 | @@: |
2390 | hidnplayr | 885 | mul [ebx + TCP_SOCKET.t_maxseg] |
886 | pop edx |
||
887 | mov [ebx + TCP_SOCKET.SND_SSTHRESH], eax |
||
1763 | hidnplayr | 888 | |
2390 | hidnplayr | 889 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 ; turn off retransmission timer |
890 | mov [ebx + TCP_SOCKET.t_rtt], 0 |
||
891 | mov eax, [edx + TCP_header.AckNumber] |
||
892 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
893 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
894 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
1763 | hidnplayr | 895 | |
3275 | hidnplayr | 896 | ; Unlock the socket |
897 | push ebx |
||
898 | lea ecx, [ebx + SOCKET.mutex] |
||
899 | call mutex_unlock |
||
1763 | hidnplayr | 900 | |
3275 | hidnplayr | 901 | ; retransmit missing segment |
902 | mov eax, [esp] |
||
903 | call TCP_output |
||
904 | |||
905 | ; Lock the socket again |
||
906 | mov ecx, [esp] |
||
907 | add ecx, SOCKET.mutex |
||
908 | call mutex_lock |
||
909 | pop ebx |
||
910 | |||
911 | ; Continue processing |
||
2390 | hidnplayr | 912 | xor edx, edx |
913 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
914 | mul [ebx + TCP_SOCKET.t_dupacks] |
||
915 | add eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
||
916 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
1763 | hidnplayr | 917 | |
2390 | hidnplayr | 918 | pop eax ; <<<< |
919 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
920 | jb @f |
||
921 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1763 | hidnplayr | 922 | @@: |
923 | |||
2390 | hidnplayr | 924 | jmp .drop |
1733 | hidnplayr | 925 | |
926 | |||
1763 | hidnplayr | 927 | .no_re_xmit: |
2390 | hidnplayr | 928 | jbe .not_dup_ack |
1733 | hidnplayr | 929 | |
2891 | hidnplayr | 930 | DEBUGF 1,"TCP_input: Increasing congestion window\n" |
1733 | hidnplayr | 931 | |
2390 | hidnplayr | 932 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
933 | add [ebx + TCP_SOCKET.SND_CWND], eax |
||
1733 | hidnplayr | 934 | |
3275 | hidnplayr | 935 | ; Unlock the socket |
936 | push ebx |
||
937 | lea ecx, [ebx + SOCKET.mutex] |
||
938 | call mutex_unlock |
||
939 | |||
940 | ; retransmit missing segment |
||
941 | mov eax, [esp] |
||
2390 | hidnplayr | 942 | call TCP_output |
1733 | hidnplayr | 943 | |
3275 | hidnplayr | 944 | ; Lock the socket again |
945 | mov ecx, [esp] |
||
946 | add ecx, SOCKET.mutex |
||
947 | call mutex_lock |
||
948 | pop ebx |
||
949 | |||
2390 | hidnplayr | 950 | jmp .drop |
1733 | hidnplayr | 951 | |
952 | |||
1763 | hidnplayr | 953 | .not_dup_ack: |
954 | |||
1733 | hidnplayr | 955 | ;------------------------------------------------- |
956 | ; If the congestion window was inflated to account |
||
957 | ; for the other side's cached packets, retract it |
||
958 | |||
2390 | hidnplayr | 959 | mov eax, [ebx + TCP_SOCKET.SND_SSTHRESH] |
960 | cmp eax, [ebx + TCP_SOCKET.SND_CWND] |
||
961 | ja @f |
||
962 | cmp [ebx + TCP_SOCKET.t_dupacks], TCP_re_xmit_thresh |
||
963 | jbe @f |
||
964 | mov [ebx + TCP_SOCKET.SND_CWND], eax |
||
1763 | hidnplayr | 965 | @@: |
1733 | hidnplayr | 966 | |
2390 | hidnplayr | 967 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
1733 | hidnplayr | 968 | |
2390 | hidnplayr | 969 | mov eax, [edx + TCP_header.AckNumber] |
970 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
971 | jbe @f |
||
1733 | hidnplayr | 972 | |
2390 | hidnplayr | 973 | ;;; TODO: update stats |
974 | jmp .drop_after_ack |
||
1733 | hidnplayr | 975 | |
1763 | hidnplayr | 976 | @@: |
1733 | hidnplayr | 977 | |
2390 | hidnplayr | 978 | mov edi, [edx + TCP_header.AckNumber] |
979 | sub edi, [ebx + TCP_SOCKET.SND_UNA] ; now we got the number of acked bytes in edi |
||
1733 | hidnplayr | 980 | |
2390 | hidnplayr | 981 | ;;; TODO: update stats |
1733 | hidnplayr | 982 | |
2891 | hidnplayr | 983 | DEBUGF 1,"TCP_input: acceptable ACK for %u bytes\n", edi |
1763 | hidnplayr | 984 | |
1733 | hidnplayr | 985 | ;------------------------------------------ |
2937 | hidnplayr | 986 | ; RTT measurements and retransmission timer (912-926) |
1733 | hidnplayr | 987 | |
2937 | hidnplayr | 988 | ; If we have a timestamp, update smoothed RTT |
1733 | hidnplayr | 989 | |
2937 | hidnplayr | 990 | test [ebx + TCP_SOCKET.temp_bits], TCP_BIT_TIMESTAMP |
2948 | hidnplayr | 991 | jz .timestamp_not_present |
3251 | hidnplayr | 992 | mov eax, [esp+4] |
2937 | hidnplayr | 993 | sub eax, [ebx + TCP_SOCKET.ts_ecr] |
994 | inc eax |
||
995 | call TCP_xmit_timer |
||
996 | jmp .rtt_done_ |
||
1733 | hidnplayr | 997 | |
2937 | hidnplayr | 998 | ; If no timestamp but transmit timer is running and timed sequence number was acked, |
999 | ; update smoothed RTT. Since we now have an RTT measurement, cancel the timer backoff |
||
1000 | ; (Phil Karn's retransmit algo) |
||
1001 | ; Recompute the initial retransmit timer |
||
1002 | |||
1003 | .timestamp_not_present: |
||
1004 | mov eax, [edx + TCP_header.AckNumber] |
||
1005 | cmp eax, [ebx + TCP_SOCKET.t_rtseq] |
||
1006 | jbe .rtt_done_ |
||
1007 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
||
1008 | test eax, eax |
||
1009 | jz .rtt_done_ |
||
1010 | call TCP_xmit_timer |
||
1011 | |||
1012 | .rtt_done_: |
||
1013 | |||
1014 | ; If all outstanding data is acked, stop retransmit timer and remember to restart (more output or persist) |
||
1015 | ; If there is more data to be acked, restart retransmit timer, using current (possible backed-off) value. |
||
1016 | |||
2390 | hidnplayr | 1017 | mov eax, [ebx + TCP_SOCKET.SND_MAX] |
1018 | cmp eax, [edx + TCP_header.AckNumber] |
||
2937 | hidnplayr | 1019 | jne .more_data |
1020 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 |
||
1021 | or [ebx + TCP_SOCKET.temp_bits], TCP_BIT_NEEDOUTPUT |
||
1022 | jmp .no_restart |
||
1023 | .more_data: |
||
1024 | cmp [ebx + TCP_SOCKET.timer_persist], 0 |
||
1025 | jne .no_restart |
||
2891 | hidnplayr | 1026 | |
2937 | hidnplayr | 1027 | mov eax, [ebx + TCP_SOCKET.t_rxtcur] |
2955 | hidnplayr | 1028 | mov [ebx + TCP_SOCKET.timer_retransmission], eax |
1733 | hidnplayr | 1029 | |
2937 | hidnplayr | 1030 | .no_restart: |
1031 | |||
1032 | |||
1733 | hidnplayr | 1033 | ;------------------------------------------- |
1034 | ; Open congestion window in response to ACKs |
||
1035 | |||
2390 | hidnplayr | 1036 | mov esi, [ebx + TCP_SOCKET.SND_CWND] |
1037 | mov eax, [ebx + TCP_SOCKET.t_maxseg] |
||
1733 | hidnplayr | 1038 | |
2390 | hidnplayr | 1039 | cmp esi, [ebx + TCP_SOCKET.SND_SSTHRESH] |
1040 | jbe @f |
||
1041 | push edx |
||
1042 | push eax |
||
1043 | mul eax |
||
1044 | div esi |
||
1045 | pop edx |
||
1046 | shr edx, 3 |
||
1047 | add eax, edx |
||
1048 | pop edx |
||
1763 | hidnplayr | 1049 | @@: |
1733 | hidnplayr | 1050 | |
2390 | hidnplayr | 1051 | add esi, eax |
1733 | hidnplayr | 1052 | |
2390 | hidnplayr | 1053 | push ecx |
1054 | mov cl, [ebx + TCP_SOCKET.SND_SCALE] |
||
1055 | mov eax, TCP_max_win |
||
1056 | shl eax, cl |
||
1057 | pop ecx |
||
1733 | hidnplayr | 1058 | |
2390 | hidnplayr | 1059 | cmp esi, eax |
2866 | hidnplayr | 1060 | cmova esi, eax |
2390 | hidnplayr | 1061 | mov [ebx + TCP_SOCKET.SND_CWND], esi |
1733 | hidnplayr | 1062 | |
2891 | hidnplayr | 1063 | ;------------------------------------------ |
1064 | ; Remove acknowledged data from send buffer |
||
1733 | hidnplayr | 1065 | |
2891 | hidnplayr | 1066 | cmp edi, [ebx + STREAM_SOCKET.snd.size] |
1067 | jbe .finiacked |
||
1733 | hidnplayr | 1068 | |
2891 | hidnplayr | 1069 | push ecx edx ebx |
1070 | mov ecx, [ebx + STREAM_SOCKET.snd.size] |
||
1071 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1072 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
||
1073 | call SOCKET_ring_free |
||
1074 | pop ebx edx ecx |
||
1733 | hidnplayr | 1075 | |
2891 | hidnplayr | 1076 | DEBUGF 1,"TCP_input: our FIN is acked\n" |
1077 | stc |
||
1763 | hidnplayr | 1078 | |
2891 | hidnplayr | 1079 | jmp .wakeup |
1763 | hidnplayr | 1080 | |
2891 | hidnplayr | 1081 | .finiacked: |
1763 | hidnplayr | 1082 | |
2390 | hidnplayr | 1083 | push ecx edx ebx |
1084 | mov ecx, edi |
||
1085 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1086 | call SOCKET_ring_free |
||
1087 | pop ebx |
||
1088 | sub [ebx + TCP_SOCKET.SND_WND], ecx |
||
1089 | pop edx ecx |
||
1733 | hidnplayr | 1090 | |
2891 | hidnplayr | 1091 | DEBUGF 1,"TCP_input: our FIN is not acked\n" |
1092 | clc |
||
1093 | |||
1094 | ;---------------------------------------- |
||
1733 | hidnplayr | 1095 | ; Wake up process waiting on send buffer |
1096 | |||
2891 | hidnplayr | 1097 | .wakeup: |
1098 | |||
3275 | hidnplayr | 1099 | pushf ; Keep the flags (Carry flag) |
2390 | hidnplayr | 1100 | mov eax, ebx |
3257 | hidnplayr | 1101 | call SOCKET_notify |
1733 | hidnplayr | 1102 | |
1831 | hidnplayr | 1103 | ; Update TCPS |
1733 | hidnplayr | 1104 | |
2390 | hidnplayr | 1105 | mov eax, [edx + TCP_header.AckNumber] |
1106 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
1107 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
1108 | jb @f |
||
1109 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1733 | hidnplayr | 1110 | @@: |
1111 | |||
2891 | hidnplayr | 1112 | popf |
1733 | hidnplayr | 1113 | |
1114 | ; General ACK handling complete |
||
1115 | ; Now do the state-specific ones |
||
3275 | hidnplayr | 1116 | ; Carry flag is set when our FIN is acked |
1733 | hidnplayr | 1117 | |
2390 | hidnplayr | 1118 | mov eax, [ebx + TCP_SOCKET.t_state] |
1119 | jmp dword [eax*4 + .ACK_sw_list] |
||
1733 | hidnplayr | 1120 | |
1121 | .ACK_sw_list: |
||
2891 | hidnplayr | 1122 | dd .ack_processed ; TCPS_CLOSED |
1123 | dd .ack_processed ; TCPS_LISTEN |
||
1124 | dd .ack_processed ; TCPS_SYN_SENT |
||
1125 | dd .ack_processed ; TCPS_SYN_RECEIVED |
||
1126 | dd .ack_processed ; TCPS_ESTABLISHED |
||
1127 | dd .ack_processed ; TCPS_CLOSE_WAIT |
||
1128 | dd .ack_fw1 ; TCPS_FIN_WAIT_1 |
||
1129 | dd .ack_c ; TCPS_CLOSING |
||
1130 | dd .ack_la ; TCPS_LAST_ACK |
||
1131 | dd .ack_processed ; TCPS_FIN_WAIT_2 |
||
1132 | dd .ack_tw ; TCPS_TIMED_WAIT |
||
1733 | hidnplayr | 1133 | |
1134 | |||
1772 | hidnplayr | 1135 | .ack_fw1: |
2891 | hidnplayr | 1136 | jnc .ack_processed |
1733 | hidnplayr | 1137 | |
2390 | hidnplayr | 1138 | test [ebx + SOCKET.state], SS_CANTRCVMORE |
1139 | jnz @f |
||
1140 | mov eax, ebx |
||
1141 | call SOCKET_is_disconnected |
||
2937 | hidnplayr | 1142 | mov [ebx + TCP_SOCKET.timer_timed_wait], TCP_time_max_idle |
1772 | hidnplayr | 1143 | @@: |
2390 | hidnplayr | 1144 | mov [ebx + TCP_SOCKET.t_state], TCPS_FIN_WAIT_2 |
1145 | jmp .ack_processed |
||
1733 | hidnplayr | 1146 | |
1772 | hidnplayr | 1147 | .ack_c: |
2891 | hidnplayr | 1148 | jnc .ack_processed |
1772 | hidnplayr | 1149 | |
2390 | hidnplayr | 1150 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1151 | mov eax, ebx |
||
1152 | call TCP_cancel_timers |
||
1153 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
1154 | mov eax, ebx |
||
1155 | call SOCKET_is_disconnected |
||
1156 | jmp .ack_processed |
||
1733 | hidnplayr | 1157 | |
1772 | hidnplayr | 1158 | .ack_la: |
2891 | hidnplayr | 1159 | jnc .ack_processed |
1733 | hidnplayr | 1160 | |
2390 | hidnplayr | 1161 | mov eax, ebx |
2882 | hidnplayr | 1162 | call TCP_disconnect |
2390 | hidnplayr | 1163 | jmp .drop |
1733 | hidnplayr | 1164 | |
1772 | hidnplayr | 1165 | .ack_tw: |
2390 | hidnplayr | 1166 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
1167 | jmp .drop_after_ack |
||
1733 | hidnplayr | 1168 | |
2930 | hidnplayr | 1169 | .reset_dupacks: ; We got a new ACK, reset duplicate ACK counter |
1170 | mov [ebx + TCP_SOCKET.t_dupacks], 0 |
||
1171 | jmp .ack_processed |
||
1733 | hidnplayr | 1172 | |
3275 | hidnplayr | 1173 | ;------- |
1174 | ; LISTEN |
||
1772 | hidnplayr | 1175 | |
3275 | hidnplayr | 1176 | align 4 |
2930 | hidnplayr | 1177 | .LISTEN: |
1178 | |||
1179 | DEBUGF 1,"TCP_input: state=listen\n" |
||
1180 | |||
2937 | hidnplayr | 1181 | test [edx + TCP_header.Flags], TH_RST |
2930 | hidnplayr | 1182 | jnz .drop |
1183 | |||
1184 | test [edx + TCP_header.Flags], TH_ACK |
||
1185 | jnz .drop_with_reset |
||
1186 | |||
1187 | test [edx + TCP_header.Flags], TH_SYN |
||
1188 | jz .drop |
||
1189 | |||
1190 | ;;; TODO: check if it's a broadcast or multicast, and drop if so |
||
1191 | |||
1192 | push dword [edi] ; Ipv4 source addres |
||
1193 | pop [ebx + IP_SOCKET.RemoteIP] |
||
1194 | |||
1195 | push [edx + TCP_header.SourcePort] |
||
1196 | pop [ebx + TCP_SOCKET.RemotePort] |
||
1197 | |||
1198 | push [edx + TCP_header.SequenceNumber] |
||
1199 | pop [ebx + TCP_SOCKET.IRS] |
||
1200 | |||
1201 | mov eax, [TCP_sequence_num] |
||
1202 | add [TCP_sequence_num], 64000 / 2 |
||
1203 | mov [ebx + TCP_SOCKET.ISS], eax |
||
1204 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1205 | |||
1206 | TCP_sendseqinit ebx |
||
1207 | TCP_rcvseqinit ebx |
||
1208 | |||
1209 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
||
1210 | mov [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1211 | mov [ebx + TCP_SOCKET.timer_keepalive], TCP_time_keep_interval ;;;; macro |
||
1212 | |||
1213 | lea eax, [ebx + STREAM_SOCKET.snd] |
||
1214 | call SOCKET_ring_create |
||
1215 | |||
1216 | lea eax, [ebx + STREAM_SOCKET.rcv] |
||
1217 | call SOCKET_ring_create |
||
1218 | |||
2937 | hidnplayr | 1219 | and [ebx + TCP_SOCKET.temp_bits], not TCP_BIT_DROPSOCKET |
1220 | |||
2930 | hidnplayr | 1221 | ;;; call SOCKET_notify_owner |
1222 | |||
1223 | jmp .trim_then_step6 |
||
1224 | |||
1225 | ;------------ |
||
1226 | ; Active Open |
||
1227 | |||
1228 | align 4 |
||
2937 | hidnplayr | 1229 | .SYN_SENT: |
2930 | hidnplayr | 1230 | |
1231 | DEBUGF 1,"TCP_input: state=syn_sent\n" |
||
1232 | |||
1233 | test [edx + TCP_header.Flags], TH_ACK |
||
1234 | jz @f |
||
1235 | |||
1236 | mov eax, [edx + TCP_header.AckNumber] |
||
1237 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
1238 | jbe .drop_with_reset |
||
1239 | |||
1240 | cmp eax, [ebx + TCP_SOCKET.SND_MAX] |
||
1241 | ja .drop_with_reset |
||
1242 | @@: |
||
1243 | |||
1244 | test [edx + TCP_header.Flags], TH_RST |
||
1245 | jz @f |
||
1246 | |||
1247 | test [edx + TCP_header.Flags], TH_ACK |
||
1248 | jz .drop |
||
1249 | |||
1250 | mov eax, ebx |
||
1251 | mov ebx, ECONNREFUSED |
||
1252 | call TCP_drop |
||
1253 | |||
1254 | jmp .drop |
||
1255 | @@: |
||
1256 | |||
1257 | test [edx + TCP_header.Flags], TH_SYN |
||
1258 | jz .drop |
||
1259 | |||
1260 | ; at this point, segment seems to be valid |
||
1261 | |||
1262 | test [edx + TCP_header.Flags], TH_ACK |
||
1263 | jz .no_syn_ack |
||
1264 | |||
1265 | ; now, process received SYN in response to an active open |
||
1266 | |||
1267 | mov eax, [edx + TCP_header.AckNumber] |
||
1268 | mov [ebx + TCP_SOCKET.SND_UNA], eax |
||
1269 | cmp eax, [ebx + TCP_SOCKET.SND_NXT] |
||
1270 | jbe @f |
||
1271 | mov [ebx + TCP_SOCKET.SND_NXT], eax |
||
1272 | @@: |
||
1273 | |||
1274 | .no_syn_ack: |
||
1275 | mov [ebx + TCP_SOCKET.timer_retransmission], 0 ; disable retransmission |
||
1276 | |||
1277 | push [edx + TCP_header.SequenceNumber] |
||
1278 | pop [ebx + TCP_SOCKET.IRS] |
||
1279 | |||
1280 | TCP_rcvseqinit ebx |
||
1281 | |||
1282 | or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
||
1283 | |||
1284 | mov eax, [ebx + TCP_SOCKET.SND_UNA] |
||
1285 | cmp eax, [ebx + TCP_SOCKET.ISS] |
||
1286 | jbe .simultaneous_open |
||
1287 | |||
1288 | test [edx + TCP_header.Flags], TH_ACK |
||
1289 | jz .simultaneous_open |
||
1290 | |||
1291 | DEBUGF 1,"TCP_input: active open\n" |
||
1292 | |||
1293 | ;;; TODO: update stats |
||
1294 | |||
1295 | ; set socket state to connected |
||
1296 | mov [ebx + SOCKET.state], SS_ISCONNECTED |
||
1297 | mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED |
||
1298 | |||
2937 | hidnplayr | 1299 | ; Do window scaling on this connection ? |
1300 | mov eax, [ebx + TCP_SOCKET.t_flags] |
||
1301 | and eax, TF_REQ_SCALE or TF_RCVD_SCALE |
||
1302 | cmp eax, TF_REQ_SCALE or TF_RCVD_SCALE |
||
1303 | jne .no_scaling |
||
2930 | hidnplayr | 1304 | |
2937 | hidnplayr | 1305 | mov ax, word [ebx + TCP_SOCKET.requested_s_scale] |
1306 | mov word [ebx + TCP_SOCKET.SND_SCALE], ax |
||
1307 | .no_scaling: |
||
2930 | hidnplayr | 1308 | |
2937 | hidnplayr | 1309 | ;;; TODO: reassemble packets queue |
1310 | |||
1311 | mov eax, [ebx + TCP_SOCKET.t_rtt] |
||
1312 | test eax, eax |
||
1313 | je .trim_then_step6 |
||
1314 | call TCP_xmit_timer |
||
2930 | hidnplayr | 1315 | jmp .trim_then_step6 |
1316 | |||
1317 | .simultaneous_open: |
||
1318 | |||
1319 | DEBUGF 1,"TCP_input: simultaneous open\n" |
||
1320 | ; We have received a syn but no ACK, so we are having a simultaneous open.. |
||
1321 | mov [ebx + TCP_SOCKET.t_state], TCPS_SYN_RECEIVED |
||
1322 | |||
1323 | ;------------------------------------- |
||
1324 | ; Common processing for receipt of SYN |
||
1325 | |||
1326 | .trim_then_step6: |
||
1327 | |||
1328 | inc [edx + TCP_header.SequenceNumber] |
||
1329 | |||
1330 | ;;; TODO: Drop any received data that follows receive window (590) |
||
1331 | |||
1332 | mov eax, [edx + TCP_header.SequenceNumber] |
||
1333 | mov [ebx + TCP_SOCKET.RCV_UP], eax |
||
1334 | dec eax |
||
1335 | mov [ebx + TCP_SOCKET.SND_WL1], eax |
||
1336 | |||
3275 | hidnplayr | 1337 | ;------- |
1338 | ; step 6 |
||
2930 | hidnplayr | 1339 | |
3275 | hidnplayr | 1340 | .ack_processed: |
2930 | hidnplayr | 1341 | |
2891 | hidnplayr | 1342 | DEBUGF 1,"TCP_input: ACK processed\n" |
1733 | hidnplayr | 1343 | |
1344 | ;---------------------------------------------- |
||
1345 | ; check if we need to update window information |
||
1346 | |||
2390 | hidnplayr | 1347 | test [edx + TCP_header.Flags], TH_ACK |
1348 | jz .no_window_update |
||
1733 | hidnplayr | 1349 | |
2390 | hidnplayr | 1350 | mov eax, [ebx + TCP_SOCKET.SND_WL1] |
1351 | cmp eax, [edx + TCP_header.SequenceNumber] |
||
1352 | jb .update_window |
||
1353 | ja @f |
||
1733 | hidnplayr | 1354 | |
2390 | hidnplayr | 1355 | mov eax, [ebx + TCP_SOCKET.SND_WL2] |
1356 | cmp eax, [edx + TCP_header.AckNumber] |
||
1357 | jb .update_window |
||
1358 | ja .no_window_update |
||
1733 | hidnplayr | 1359 | @@: |
1360 | |||
2390 | hidnplayr | 1361 | mov eax, dword [edx + TCP_header.Window] |
1362 | cmp eax, [ebx + TCP_SOCKET.SND_WND] |
||
1363 | jbe .no_window_update |
||
1733 | hidnplayr | 1364 | |
1365 | .update_window: |
||
1366 | |||
2954 | hidnplayr | 1367 | ;;; TODO: update stats (Keep track of pure window updates) |
1733 | hidnplayr | 1368 | |
2390 | hidnplayr | 1369 | mov eax, dword [edx + TCP_header.Window] |
1370 | cmp eax, [ebx + TCP_SOCKET.max_sndwnd] |
||
1371 | jbe @f |
||
1372 | mov [ebx + TCP_SOCKET.max_sndwnd], eax |
||
1733 | hidnplayr | 1373 | @@: |
2390 | hidnplayr | 1374 | mov [ebx + TCP_SOCKET.SND_WND], eax |
1733 | hidnplayr | 1375 | |
2891 | hidnplayr | 1376 | DEBUGF 1,"TCP_input: Updating window to %u\n", eax |
2612 | hidnplayr | 1377 | |
2390 | hidnplayr | 1378 | push [edx + TCP_header.SequenceNumber] |
1379 | pop [ebx + TCP_SOCKET.SND_WL1] |
||
1733 | hidnplayr | 1380 | |
2390 | hidnplayr | 1381 | push [edx + TCP_header.AckNumber] |
1382 | pop [ebx + TCP_SOCKET.SND_WL2] |
||
1733 | hidnplayr | 1383 | |
2937 | hidnplayr | 1384 | or [ebx + TCP_SOCKET.temp_bits], TCP_BIT_NEEDOUTPUT |
1733 | hidnplayr | 1385 | |
1386 | .no_window_update: |
||
1387 | |||
1388 | ;----------------- |
||
1389 | ; process URG flag |
||
1390 | |||
2390 | hidnplayr | 1391 | test [edx + TCP_header.Flags], TH_URG |
1392 | jz .not_urgent |
||
1733 | hidnplayr | 1393 | |
2390 | hidnplayr | 1394 | cmp [edx + TCP_header.UrgentPointer], 0 |
1395 | jz .not_urgent |
||
1733 | hidnplayr | 1396 | |
2390 | hidnplayr | 1397 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1398 | je .not_urgent |
||
1733 | hidnplayr | 1399 | |
1400 | ; Ignore bogus urgent offsets |
||
1401 | |||
2390 | hidnplayr | 1402 | movzx eax, [edx + TCP_header.UrgentPointer] |
1403 | add eax, [ebx + STREAM_SOCKET.rcv.size] |
||
1404 | cmp eax, SOCKET_MAXDATA |
||
1405 | jbe .not_urgent |
||
1733 | hidnplayr | 1406 | |
2390 | hidnplayr | 1407 | mov [edx + TCP_header.UrgentPointer], 0 |
1408 | and [edx + TCP_header.Flags], not (TH_URG) |
||
1409 | jmp .do_data |
||
1733 | hidnplayr | 1410 | |
1411 | .not_urgent: |
||
1412 | |||
1413 | ; processing of received urgent pointer |
||
1414 | |||
2390 | hidnplayr | 1415 | ;;; TODO (1051-1093) |
1733 | hidnplayr | 1416 | |
1417 | |||
2891 | hidnplayr | 1418 | ;--------------------------------------- |
1419 | ; process the data in the segment (1094) |
||
1733 | hidnplayr | 1420 | |
1421 | .do_data: |
||
1422 | |||
2891 | hidnplayr | 1423 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1424 | jae .final_processing |
||
1733 | hidnplayr | 1425 | |
2390 | hidnplayr | 1426 | test [edx + TCP_header.Flags], TH_FIN |
2891 | hidnplayr | 1427 | jnz @f |
1733 | hidnplayr | 1428 | |
2390 | hidnplayr | 1429 | test ecx, ecx |
2891 | hidnplayr | 1430 | jnz .final_processing |
1431 | @@: |
||
1733 | hidnplayr | 1432 | |
2891 | hidnplayr | 1433 | ; call TCP_reassemble ;;; TODO |
1733 | hidnplayr | 1434 | |
1435 | ;--------------- |
||
1436 | ; FIN processing |
||
1437 | |||
2891 | hidnplayr | 1438 | test [edx + TCP_header.Flags], TH_FIN |
2930 | hidnplayr | 1439 | jz .final_processing |
1733 | hidnplayr | 1440 | |
2891 | hidnplayr | 1441 | DEBUGF 1,"TCP_input: Processing FIN\n" |
1733 | hidnplayr | 1442 | |
2891 | hidnplayr | 1443 | cmp [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1444 | jae .not_first_fin |
||
1774 | hidnplayr | 1445 | |
2891 | hidnplayr | 1446 | DEBUGF 1,"TCP_input: First FIN for this connection\n" |
1774 | hidnplayr | 1447 | |
2390 | hidnplayr | 1448 | mov eax, ebx |
1449 | call SOCKET_cant_recv_more |
||
1774 | hidnplayr | 1450 | |
2390 | hidnplayr | 1451 | mov [ebx + TCP_SOCKET.t_flags], TF_ACKNOW |
1452 | inc [ebx + TCP_SOCKET.RCV_NXT] |
||
1774 | hidnplayr | 1453 | |
1454 | .not_first_fin: |
||
2390 | hidnplayr | 1455 | mov eax, [ebx + TCP_SOCKET.t_state] |
1456 | shl eax, 2 |
||
1457 | jmp dword [eax + .FIN_sw_list] |
||
1733 | hidnplayr | 1458 | |
1459 | .FIN_sw_list: |
||
2937 | hidnplayr | 1460 | dd .final_processing ; TCPS_CLOSED |
1461 | dd .final_processing ; TCPS_LISTEN |
||
1462 | dd .final_processing ; TCPS_SYN_SENT |
||
1463 | dd .fin_syn_est ; TCPS_SYN_RECEIVED |
||
1464 | dd .fin_syn_est ; TCPS_ESTABLISHED |
||
1465 | dd .final_processing ; TCPS_CLOSE_WAIT |
||
1466 | dd .fin_wait1 ; TCPS_FIN_WAIT_1 |
||
1467 | dd .final_processing ; TCPS_CLOSING |
||
1468 | dd .final_processing ; TCPS_LAST_ACK |
||
1469 | dd .fin_wait2 ; TCPS_FIN_WAIT_2 |
||
1470 | dd .fin_timed ; TCPS_TIMED_WAIT |
||
1733 | hidnplayr | 1471 | |
1472 | .fin_syn_est: |
||
1473 | |||
2390 | hidnplayr | 1474 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT |
2930 | hidnplayr | 1475 | jmp .final_processing |
1733 | hidnplayr | 1476 | |
1477 | .fin_wait1: |
||
1478 | |||
2390 | hidnplayr | 1479 | mov [ebx + TCP_SOCKET.t_state], TCPS_CLOSING |
2930 | hidnplayr | 1480 | jmp .final_processing |
1733 | hidnplayr | 1481 | |
1482 | .fin_wait2: |
||
1483 | |||
2390 | hidnplayr | 1484 | mov [ebx + TCP_SOCKET.t_state], TCPS_TIMED_WAIT |
1485 | mov eax, ebx |
||
1486 | call TCP_cancel_timers |
||
1487 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
||
1488 | call SOCKET_is_disconnected |
||
2930 | hidnplayr | 1489 | jmp .final_processing |
1733 | hidnplayr | 1490 | |
1491 | .fin_timed: |
||
2390 | hidnplayr | 1492 | mov [ebx + TCP_SOCKET.timer_timed_wait], 2 * TCP_time_MSL |
2930 | hidnplayr | 1493 | jmp .final_processing |
1733 | hidnplayr | 1494 | |
1495 | |||
2930 | hidnplayr | 1496 | .drop_after_ack: |
1497 | DEBUGF 1,"TCP_input: Drop after ACK\n" |
||
1733 | hidnplayr | 1498 | |
2930 | hidnplayr | 1499 | push edx ebx |
2891 | hidnplayr | 1500 | lea ecx, [ebx + SOCKET.mutex] |
1501 | call mutex_unlock |
||
2930 | hidnplayr | 1502 | pop eax edx |
2891 | hidnplayr | 1503 | |
2930 | hidnplayr | 1504 | test [edx + TCP_header.Flags], TH_RST |
1505 | jnz .dumpit |
||
1733 | hidnplayr | 1506 | |
2930 | hidnplayr | 1507 | or [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
1508 | jmp .need_output |
||
2891 | hidnplayr | 1509 | |
2930 | hidnplayr | 1510 | .drop_with_reset: |
1511 | DEBUGF 1,"TCP_input: Drop with reset\n" |
||
1512 | |||
1513 | push ebx edx |
||
2402 | hidnplayr | 1514 | lea ecx, [ebx + SOCKET.mutex] |
1515 | call mutex_unlock |
||
2930 | hidnplayr | 1516 | pop edx ebx |
1733 | hidnplayr | 1517 | |
2930 | hidnplayr | 1518 | test [edx + TCP_header.Flags], TH_RST |
1519 | jnz .dumpit |
||
1733 | hidnplayr | 1520 | |
2930 | hidnplayr | 1521 | ;;; if its a multicast/broadcast, also drop |
1733 | hidnplayr | 1522 | |
2930 | hidnplayr | 1523 | test [edx + TCP_header.Flags], TH_ACK |
1524 | jnz .respond_ack |
||
1733 | hidnplayr | 1525 | |
2930 | hidnplayr | 1526 | test [edx + TCP_header.Flags], TH_SYN |
1527 | jnz .respond_syn |
||
1528 | jmp .dumpit |
||
1733 | hidnplayr | 1529 | |
2930 | hidnplayr | 1530 | ;----------------- |
1531 | ; Final processing |
||
1733 | hidnplayr | 1532 | |
2930 | hidnplayr | 1533 | .final_processing: |
1534 | DEBUGF 1,"TCP_input: Final processing\n" |
||
1733 | hidnplayr | 1535 | |
2930 | hidnplayr | 1536 | push ebx |
1537 | lea ecx, [ebx + SOCKET.mutex] |
||
1538 | call mutex_unlock |
||
1539 | pop eax |
||
1733 | hidnplayr | 1540 | |
2937 | hidnplayr | 1541 | test [eax + TCP_SOCKET.temp_bits], TCP_BIT_NEEDOUTPUT |
1542 | jnz .need_output |
||
1733 | hidnplayr | 1543 | |
2930 | hidnplayr | 1544 | test [eax + TCP_SOCKET.t_flags], TF_ACKNOW |
1545 | jz .dumpit |
||
1546 | DEBUGF 1,"TCP_input: ACK now!\n" |
||
1733 | hidnplayr | 1547 | |
2930 | hidnplayr | 1548 | .need_output: |
2954 | hidnplayr | 1549 | DEBUGF 1,"TCP_input: need output\n" |
2930 | hidnplayr | 1550 | call TCP_output |
1733 | hidnplayr | 1551 | |
2930 | hidnplayr | 1552 | .dumpit: |
1553 | DEBUGF 1,"TCP_input: dumping\n" |
||
1733 | hidnplayr | 1554 | |
2390 | hidnplayr | 1555 | call kernel_free |
1556 | add esp, 4 |
||
1557 | ret |
||
1733 | hidnplayr | 1558 | |
3275 | hidnplayr | 1559 | ;--------- |
1560 | ; Respond |
||
1733 | hidnplayr | 1561 | |
1562 | .respond_ack: |
||
2390 | hidnplayr | 1563 | push ebx |
1564 | mov cl, TH_RST |
||
3143 | hidnplayr | 1565 | call TCP_respond |
2390 | hidnplayr | 1566 | pop ebx |
1567 | jmp .destroy_new_socket |
||
1733 | hidnplayr | 1568 | |
1569 | .respond_syn: |
||
2390 | hidnplayr | 1570 | push ebx |
1571 | mov cl, TH_RST + TH_ACK |
||
3143 | hidnplayr | 1572 | call TCP_respond |
2390 | hidnplayr | 1573 | pop ebx |
1574 | jmp .destroy_new_socket |
||
1733 | hidnplayr | 1575 | |
3275 | hidnplayr | 1576 | .respond_seg_reset: |
1577 | test [edx + TCP_header.Flags], TH_RST |
||
1578 | jnz .drop_no_socket |
||
1733 | hidnplayr | 1579 | |
3275 | hidnplayr | 1580 | ;;; TODO: if its a multicast/broadcast, also drop |
1733 | hidnplayr | 1581 | |
3275 | hidnplayr | 1582 | test [edx + TCP_header.Flags], TH_ACK |
1583 | jnz .respond_seg_ack |
||
1584 | |||
1585 | test [edx + TCP_header.Flags], TH_SYN |
||
1586 | jnz .respond_seg_syn |
||
1587 | |||
1588 | jmp .drop_no_socket |
||
1589 | |||
1590 | .respond_seg_ack: |
||
1591 | mov cl, TH_RST |
||
1592 | call TCP_respond_segment |
||
1593 | jmp .drop_no_socket |
||
1594 | |||
1595 | .respond_seg_syn: |
||
1596 | mov cl, TH_RST + TH_ACK |
||
1597 | call TCP_respond_segment |
||
1598 | jmp .drop_no_socket |
||
1599 | |||
1733 | hidnplayr | 1600 | ;----- |
1601 | ; Drop |
||
1602 | |||
2930 | hidnplayr | 1603 | .drop: |
3275 | hidnplayr | 1604 | DEBUGF 1,"TCP_input: Dropping segment\n" |
1733 | hidnplayr | 1605 | |
2402 | hidnplayr | 1606 | pusha |
1607 | lea ecx, [ebx + SOCKET.mutex] |
||
1608 | call mutex_unlock |
||
1609 | popa |
||
1733 | hidnplayr | 1610 | |
2937 | hidnplayr | 1611 | .destroy_new_socket: |
1612 | test [ebx + TCP_SOCKET.temp_bits], TCP_BIT_DROPSOCKET |
||
1613 | jz .drop_no_socket |
||
1733 | hidnplayr | 1614 | |
2937 | hidnplayr | 1615 | mov eax, ebx |
1616 | call SOCKET_free |
||
1733 | hidnplayr | 1617 | |
2930 | hidnplayr | 1618 | .drop_no_socket: |
1619 | DEBUGF 1,"TCP_input: Drop (no socket)\n" |
||
1620 | |||
2390 | hidnplayr | 1621 | call kernel_free |
1622 | add esp, 4 |
||
2600 | hidnplayr | 1623 | ret |