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1159 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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1514 | hidnplayr | 3 | ;; Copyright (C) KolibriOS team 2004-2010. All rights reserved. ;; |
1159 | hidnplayr | 4 | ;; Distributed under terms of the GNU General Public License ;; |
5 | ;; ;; |
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6 | ;; UDP.INC ;; |
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7 | ;; ;; |
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8 | ;; Part of the tcp/ip network stack for KolibriOS ;; |
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9 | ;; ;; |
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10 | ;; Written by hidnplayr@kolibrios.org ;; |
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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 | |||
1206 | hidnplayr | 17 | $Revision: 2369 $ |
1159 | hidnplayr | 18 | |
19 | |||
2310 | hidnplayr | 20 | struct UDP_header |
1159 | hidnplayr | 21 | |
2308 | hidnplayr | 22 | SourcePort dw ? |
23 | DestinationPort dw ? |
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24 | Length dw ? ; Length of (UDP Header + Data) |
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25 | Checksum dw ? |
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2305 | hidnplayr | 26 | |
1159 | hidnplayr | 27 | ends |
28 | |||
29 | |||
30 | align 4 |
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31 | uglobal |
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2308 | hidnplayr | 32 | UDP_PACKETS_TX rd MAX_IP |
33 | UDP_PACKETS_RX rd MAX_IP |
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1159 | hidnplayr | 34 | endg |
35 | |||
36 | |||
37 | ;----------------------------------------------------------------- |
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38 | ; |
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39 | ; UDP_init |
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40 | ; |
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41 | ; This function resets all UDP variables |
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42 | ; |
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43 | ;----------------------------------------------------------------- |
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2308 | hidnplayr | 44 | macro UDP_init { |
1159 | hidnplayr | 45 | |
2308 | hidnplayr | 46 | xor eax, eax |
47 | mov edi, UDP_PACKETS_TX |
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48 | mov ecx, 2*MAX_IP |
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49 | rep stosd |
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1529 | hidnplayr | 50 | } |
1159 | hidnplayr | 51 | |
52 | |||
2308 | hidnplayr | 53 | macro UDP_checksum IP1, IP2 { ; esi = ptr to udp packet, ecx = packet size, destroys: ecx, edx |
1529 | hidnplayr | 54 | |
55 | ; Pseudoheader |
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2308 | hidnplayr | 56 | mov edx, IP_PROTO_UDP |
1529 | hidnplayr | 57 | |
2308 | hidnplayr | 58 | add dl, [IP1+1] |
59 | adc dh, [IP1+0] |
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60 | adc dl, [IP1+3] |
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61 | adc dh, [IP1+2] |
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1529 | hidnplayr | 62 | |
2308 | hidnplayr | 63 | adc dl, [IP2+1] |
64 | adc dh, [IP2+0] |
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65 | adc dl, [IP2+3] |
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66 | adc dh, [IP2+2] |
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1529 | hidnplayr | 67 | |
2310 | hidnplayr | 68 | adc dl, cl ; byte[esi+UDP_header.Length+1] |
69 | adc dh, ch ; byte[esi+UDP_header.Length+0] |
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1529 | hidnplayr | 70 | |
71 | ; Done with pseudoheader, now do real header |
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2310 | hidnplayr | 72 | adc dl, byte[esi+UDP_header.SourcePort+1] |
73 | adc dh, byte[esi+UDP_header.SourcePort+0] |
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1529 | hidnplayr | 74 | |
2310 | hidnplayr | 75 | adc dl, byte[esi+UDP_header.DestinationPort+1] |
76 | adc dh, byte[esi+UDP_header.DestinationPort+0] |
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1529 | hidnplayr | 77 | |
2310 | hidnplayr | 78 | adc dl, byte[esi+UDP_header.Length+1] |
79 | adc dh, byte[esi+UDP_header.Length+0] |
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1529 | hidnplayr | 80 | |
2308 | hidnplayr | 81 | adc edx, 0 |
1529 | hidnplayr | 82 | |
83 | ; Done with header, now do data |
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2308 | hidnplayr | 84 | push esi |
2310 | hidnplayr | 85 | movzx ecx, [esi+UDP_header.Length] |
2308 | hidnplayr | 86 | rol cx , 8 |
2310 | hidnplayr | 87 | sub cx , sizeof.UDP_header |
88 | add esi, sizeof.UDP_header |
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1529 | hidnplayr | 89 | |
2308 | hidnplayr | 90 | call checksum_1 |
91 | call checksum_2 |
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92 | pop esi |
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1529 | hidnplayr | 93 | |
2310 | hidnplayr | 94 | add [esi+UDP_header.Checksum], dx ; this final instruction will set or clear ZF :) |
1529 | hidnplayr | 95 | |
96 | } |
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97 | |||
98 | |||
1159 | hidnplayr | 99 | ;----------------------------------------------------------------- |
100 | ; |
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1514 | hidnplayr | 101 | ; UDP_input: |
1159 | hidnplayr | 102 | ; |
1514 | hidnplayr | 103 | ; Called by IPv4_input, |
1159 | hidnplayr | 104 | ; this procedure will inject the udp data diagrams in the application sockets. |
105 | ; |
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1529 | hidnplayr | 106 | ; IN: [esp] = Pointer to buffer |
107 | ; [esp+4] = size of buffer |
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108 | ; ebx = ptr to device struct |
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109 | ; ecx = UDP Packet size |
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2310 | hidnplayr | 110 | ; esi = ptr to UDP header |
2308 | hidnplayr | 111 | ; edi = ptr to ipv4 source and dest address |
1484 | hidnplayr | 112 | ; |
1159 | hidnplayr | 113 | ; OUT: / |
114 | ; |
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115 | ;----------------------------------------------------------------- |
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1206 | hidnplayr | 116 | align 4 |
1514 | hidnplayr | 117 | UDP_input: |
1159 | hidnplayr | 118 | |
2308 | hidnplayr | 119 | DEBUGF 1,"UDP_input, size:%u\n", ecx |
1473 | hidnplayr | 120 | |
2310 | hidnplayr | 121 | ; First validate, checksum |
122 | |||
123 | neg [esi + UDP_header.Checksum] ; substract checksum from 0 |
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2308 | hidnplayr | 124 | jz .no_checksum ; if checksum is zero, it is considered valid and we continue processing |
125 | ; otherwise, we will re-calculate the checksum and add it to this value, thus creating 0 when it is correct |
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1159 | hidnplayr | 126 | |
2308 | hidnplayr | 127 | push esi |
128 | UDP_checksum (edi), (edi+4) |
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2369 | hidnplayr | 129 | pop esi |
2308 | hidnplayr | 130 | jnz .checksum_mismatch |
1249 | hidnplayr | 131 | |
1473 | hidnplayr | 132 | .no_checksum: |
2308 | hidnplayr | 133 | DEBUGF 1,"UDP Checksum is correct\n" |
1473 | hidnplayr | 134 | |
2310 | hidnplayr | 135 | ; Convert port numbers to intel format |
136 | |||
2369 | hidnplayr | 137 | rol [esi + UDP_header.DestinationPort], 8 |
138 | rol [esi + UDP_header.SourcePort], 8 |
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139 | rol [esi + UDP_header.Length], 8 |
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2310 | hidnplayr | 140 | |
2308 | hidnplayr | 141 | ; Look for a socket where |
142 | ; IP Packet UDP Destination Port = local Port |
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143 | ; IP Packet SA = Remote IP |
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1159 | hidnplayr | 144 | |
2369 | hidnplayr | 145 | mov cx, [esi + UDP_header.SourcePort] |
146 | mov dx, [esi + UDP_header.DestinationPort] |
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2310 | hidnplayr | 147 | mov edi, [edi + 4] ; ipv4 source address |
2308 | hidnplayr | 148 | mov eax, net_sockets |
2310 | hidnplayr | 149 | |
1159 | hidnplayr | 150 | .next_socket: |
2308 | hidnplayr | 151 | mov eax, [eax + SOCKET.NextPtr] |
152 | or eax, eax |
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153 | jz .dump |
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2310 | hidnplayr | 154 | |
2308 | hidnplayr | 155 | cmp [eax + SOCKET.Domain], AF_INET4 |
156 | jne .next_socket |
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2310 | hidnplayr | 157 | |
2308 | hidnplayr | 158 | cmp [eax + SOCKET.Protocol], IP_PROTO_UDP |
159 | jne .next_socket |
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2310 | hidnplayr | 160 | |
2369 | hidnplayr | 161 | cmp [eax + UDP_SOCKET.LocalPort], dx |
2308 | hidnplayr | 162 | jne .next_socket |
1159 | hidnplayr | 163 | |
2308 | hidnplayr | 164 | DEBUGF 1,"using socket: %x\n", eax |
1208 | hidnplayr | 165 | |
2308 | hidnplayr | 166 | ;;; TODO: when packet is processed, check more sockets! |
1159 | hidnplayr | 167 | |
2366 | hidnplayr | 168 | ; cmp [eax + IP_SOCKET.RemoteIP], 0xffffffff |
169 | ; je @f |
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170 | ; cmp [eax + IP_SOCKET.RemoteIP], edi |
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171 | ; jne .next_socket |
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172 | ; @@: |
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173 | ; |
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174 | ; FIXME: UDP should check remote IP, but not under all circumstances! |
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1159 | hidnplayr | 175 | |
2308 | hidnplayr | 176 | cmp [eax + UDP_SOCKET.firstpacket], 0 |
2311 | hidnplayr | 177 | je .updateport |
1159 | hidnplayr | 178 | |
2310 | hidnplayr | 179 | cmp [eax + UDP_SOCKET.RemotePort], cx |
2308 | hidnplayr | 180 | jne .dump |
1159 | hidnplayr | 181 | |
2308 | hidnplayr | 182 | push ebx |
183 | lea ebx, [eax + SOCKET.lock] |
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184 | call wait_mutex |
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185 | pop ebx |
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1337 | hidnplayr | 186 | |
1514 | hidnplayr | 187 | .updatesock: |
2308 | hidnplayr | 188 | inc [UDP_PACKETS_RX] |
189 | DEBUGF 1,"Found valid UDP packet for socket %x\n", eax |
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2369 | hidnplayr | 190 | movzx ecx, [esi + UDP_header.Length] |
2310 | hidnplayr | 191 | sub ecx, sizeof.UDP_header |
2369 | hidnplayr | 192 | add esi, sizeof.UDP_header |
1159 | hidnplayr | 193 | |
2308 | hidnplayr | 194 | jmp SOCKET_input |
1159 | hidnplayr | 195 | |
1335 | hidnplayr | 196 | .updateport: |
2308 | hidnplayr | 197 | push ebx |
198 | lea ebx, [eax + SOCKET.lock] |
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199 | call wait_mutex |
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200 | pop ebx |
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1337 | hidnplayr | 201 | |
2311 | hidnplayr | 202 | DEBUGF 1,"Changing remote port to: %u\n", cx |
203 | mov [eax + UDP_SOCKET.RemotePort], cx |
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2308 | hidnplayr | 204 | inc [eax + UDP_SOCKET.firstpacket] |
1335 | hidnplayr | 205 | |
2308 | hidnplayr | 206 | jmp .updatesock |
1335 | hidnplayr | 207 | |
1483 | hidnplayr | 208 | |
1473 | hidnplayr | 209 | .checksum_mismatch: |
210 | |||
2308 | hidnplayr | 211 | DEBUGF 2,"UDP_Handler - checksum mismatch\n" |
1473 | hidnplayr | 212 | |
1206 | hidnplayr | 213 | .dump: |
2308 | hidnplayr | 214 | call kernel_free |
215 | add esp, 4 ; pop (balance stack) |
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216 | DEBUGF 2,"UDP_Handler - dumping\n" |
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1159 | hidnplayr | 217 | |
2308 | hidnplayr | 218 | ret |
1159 | hidnplayr | 219 | |
220 | |||
221 | |||
222 | |||
223 | ;----------------------------------------------------------------- |
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224 | ; |
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1514 | hidnplayr | 225 | ; UDP_output |
1159 | hidnplayr | 226 | ; |
1249 | hidnplayr | 227 | ; IN: eax = socket pointer |
228 | ; ecx = number of bytes to send |
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229 | ; esi = pointer to data |
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1159 | hidnplayr | 230 | ; |
231 | ;----------------------------------------------------------------- |
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232 | |||
1249 | hidnplayr | 233 | align 4 |
1514 | hidnplayr | 234 | UDP_output: |
1159 | hidnplayr | 235 | |
2308 | hidnplayr | 236 | DEBUGF 1,"UDP_output: socket:%x, bytes: %u, data ptr: %x\n", eax, ecx, esi |
1249 | hidnplayr | 237 | |
2308 | hidnplayr | 238 | mov dx, [eax + UDP_SOCKET.RemotePort] |
239 | DEBUGF 1,"remote port: %u\n", dx |
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240 | rol dx, 8 |
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241 | rol edx, 16 |
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242 | mov dx, [eax + UDP_SOCKET.LocalPort] |
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243 | DEBUGF 1,"local port: %u\n", dx |
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244 | rol dx, 8 |
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1159 | hidnplayr | 245 | |
2308 | hidnplayr | 246 | mov ebx, [eax + IP_SOCKET.LocalIP] |
247 | mov eax, [eax + IP_SOCKET.RemoteIP] |
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1514 | hidnplayr | 248 | |
2308 | hidnplayr | 249 | mov di, IP_PROTO_UDP shl 8 + 128 |
250 | sub esp, 8 ; Data ptr and data size will be placed here |
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2310 | hidnplayr | 251 | add ecx, sizeof.UDP_header |
1159 | hidnplayr | 252 | |
1514 | hidnplayr | 253 | ;;; TODO: fragment id |
2308 | hidnplayr | 254 | push edx esi |
255 | call IPv4_output |
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256 | jz .fail |
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1159 | hidnplayr | 257 | |
2308 | hidnplayr | 258 | mov [esp + 8], eax ; pointer to buffer start |
259 | mov [esp + 8 + 4], edx ; buffer size |
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1159 | hidnplayr | 260 | |
2310 | hidnplayr | 261 | mov [edi + UDP_header.Length], cx |
262 | rol [edi + UDP_header.Length], 8 |
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1249 | hidnplayr | 263 | |
2308 | hidnplayr | 264 | pop esi |
265 | push edi ecx |
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2310 | hidnplayr | 266 | sub ecx, sizeof.UDP_header |
267 | add edi, sizeof.UDP_header |
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2308 | hidnplayr | 268 | shr ecx, 2 |
269 | rep movsd |
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270 | mov ecx, [esp] |
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271 | and ecx, 3 |
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272 | rep movsb |
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273 | pop ecx edi |
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1159 | hidnplayr | 274 | |
2310 | hidnplayr | 275 | pop dword [edi + UDP_header.SourcePort] |
1159 | hidnplayr | 276 | |
1482 | hidnplayr | 277 | ; Checksum |
2308 | hidnplayr | 278 | mov esi, edi |
2310 | hidnplayr | 279 | mov [edi + UDP_header.Checksum], 0 |
2308 | hidnplayr | 280 | UDP_checksum (edi-4), (edi-8) ; TODO: fix this, IPv4 packet could have options.. |
1159 | hidnplayr | 281 | |
2308 | hidnplayr | 282 | inc [UDP_PACKETS_TX] |
1206 | hidnplayr | 283 | |
2308 | hidnplayr | 284 | DEBUGF 1,"Sending UDP Packet to device %x\n", ebx |
1159 | hidnplayr | 285 | |
2308 | hidnplayr | 286 | call [ebx + NET_DEVICE.transmit] |
287 | ret |
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1529 | hidnplayr | 288 | |
1206 | hidnplayr | 289 | .fail: |
2308 | hidnplayr | 290 | DEBUGF 1,"UDP_output: failed\n" |
291 | add esp, 4+4+8 |
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292 | xor eax, eax |
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293 | ret |
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1159 | hidnplayr | 294 | |
295 | |||
1206 | hidnplayr | 296 | |
1159 | hidnplayr | 297 | ;--------------------------------------------------------------------------- |
298 | ; |
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299 | ; UDP_API |
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300 | ; |
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301 | ; This function is called by system function 75 |
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302 | ; |
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303 | ; IN: subfunction number in bl |
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304 | ; device number in bh |
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305 | ; ecx, edx, .. depends on subfunction |
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306 | ; |
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307 | ; OUT: |
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308 | ; |
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309 | ;--------------------------------------------------------------------------- |
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310 | |||
311 | align 4 |
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312 | UDP_API: |
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313 | |||
2308 | hidnplayr | 314 | movzx eax, bh |
315 | shl eax, 2 |
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1159 | hidnplayr | 316 | |
2308 | hidnplayr | 317 | test bl, bl |
318 | jz .packets_tx ; 0 |
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319 | dec bl |
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320 | jz .packets_rx ; 1 |
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1159 | hidnplayr | 321 | |
322 | .error: |
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2308 | hidnplayr | 323 | mov eax, -1 |
324 | ret |
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1159 | hidnplayr | 325 | |
326 | .packets_tx: |
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2311 | hidnplayr | 327 | mov eax, [UDP_PACKETS_TX + eax] |
2308 | hidnplayr | 328 | ret |
1159 | hidnplayr | 329 | |
330 | .packets_rx: |
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2311 | hidnplayr | 331 | mov eax, [UDP_PACKETS_RX + eax] |
2308 | hidnplayr | 332 | ret |