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3545 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; Copyright (C) KolibriOS team 2004-2012. All rights reserved. ;; |
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4 | ;; Distributed under terms of the GNU General Public License ;; |
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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 | |||
17 | $Revision: 2995 $ |
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18 | |||
19 | |||
20 | struct UDP_header |
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21 | |||
22 | SourcePort dw ? |
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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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26 | |||
27 | ends |
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28 | |||
29 | |||
3698 | hidnplayr | 30 | uglobal |
3545 | hidnplayr | 31 | align 4 |
3698 | hidnplayr | 32 | |
3600 | hidnplayr | 33 | UDP_PACKETS_TX rd NET_DEVICES_MAX |
34 | UDP_PACKETS_RX rd NET_DEVICES_MAX |
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3698 | hidnplayr | 35 | |
3545 | hidnplayr | 36 | endg |
37 | |||
38 | |||
39 | ;----------------------------------------------------------------- |
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40 | ; |
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41 | ; UDP_init |
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42 | ; |
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43 | ; This function resets all UDP variables |
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44 | ; |
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45 | ;----------------------------------------------------------------- |
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46 | macro UDP_init { |
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47 | |||
48 | xor eax, eax |
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49 | mov edi, UDP_PACKETS_TX |
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3600 | hidnplayr | 50 | mov ecx, 2*NET_DEVICES_MAX |
3545 | hidnplayr | 51 | rep stosd |
52 | } |
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53 | |||
54 | |||
55 | macro UDP_checksum IP1, IP2 { ; esi = ptr to udp packet, ecx = packet size, destroys: ecx, edx |
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56 | |||
57 | ; Pseudoheader |
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58 | mov edx, IP_PROTO_UDP |
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59 | |||
60 | add dl, [IP1+1] |
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61 | adc dh, [IP1+0] |
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62 | adc dl, [IP1+3] |
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63 | adc dh, [IP1+2] |
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64 | |||
65 | adc dl, [IP2+1] |
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66 | adc dh, [IP2+0] |
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67 | adc dl, [IP2+3] |
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68 | adc dh, [IP2+2] |
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69 | |||
70 | adc dl, cl ; byte[esi+UDP_header.Length+1] |
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71 | adc dh, ch ; byte[esi+UDP_header.Length+0] |
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72 | |||
73 | ; Done with pseudoheader, now do real header |
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74 | adc dl, byte[esi+UDP_header.SourcePort+1] |
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75 | adc dh, byte[esi+UDP_header.SourcePort+0] |
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76 | |||
77 | adc dl, byte[esi+UDP_header.DestinationPort+1] |
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78 | adc dh, byte[esi+UDP_header.DestinationPort+0] |
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79 | |||
80 | adc dl, byte[esi+UDP_header.Length+1] |
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81 | adc dh, byte[esi+UDP_header.Length+0] |
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82 | |||
83 | adc edx, 0 |
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84 | |||
85 | ; Done with header, now do data |
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86 | push esi |
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87 | movzx ecx, [esi+UDP_header.Length] |
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88 | rol cx , 8 |
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89 | sub cx , sizeof.UDP_header |
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90 | add esi, sizeof.UDP_header |
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91 | |||
92 | call checksum_1 |
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93 | call checksum_2 |
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94 | pop esi |
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95 | |||
96 | add [esi+UDP_header.Checksum], dx ; this final instruction will set or clear ZF :) |
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97 | |||
98 | } |
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99 | |||
100 | |||
101 | ;----------------------------------------------------------------- |
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102 | ; |
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103 | ; UDP_input: |
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104 | ; |
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105 | ; Called by IPv4_input, |
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106 | ; this procedure will inject the udp data diagrams in the application sockets. |
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107 | ; |
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108 | ; IN: [esp] = Pointer to buffer |
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109 | ; [esp+4] = size of buffer |
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110 | ; ebx = ptr to device struct |
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111 | ; ecx = UDP Packet size |
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112 | ; esi = ptr to UDP header |
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113 | ; edi = ptr to ipv4 source and dest address |
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114 | ; |
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115 | ; OUT: / |
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116 | ; |
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117 | ;----------------------------------------------------------------- |
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118 | align 4 |
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3698 | hidnplayr | 119 | diff16 "UDP packetgfgfgfgfs", 0, $ |
3545 | hidnplayr | 120 | UDP_input: |
121 | |||
3556 | hidnplayr | 122 | DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: size=%u\n", ecx |
3545 | hidnplayr | 123 | |
124 | ; First validate, checksum |
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125 | |||
126 | neg [esi + UDP_header.Checksum] ; substract checksum from 0 |
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127 | jz .no_checksum ; if checksum is zero, it is considered valid |
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128 | |||
129 | ; otherwise, we will re-calculate the checksum and add it to this value, thus creating 0 when it is correct |
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130 | |||
131 | UDP_checksum (edi), (edi+4) |
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132 | jnz .checksum_mismatch |
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133 | |||
134 | .no_checksum: |
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3556 | hidnplayr | 135 | DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: checksum ok\n" |
3545 | hidnplayr | 136 | |
137 | ; Convert length to little endian |
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138 | |||
139 | rol [esi + UDP_header.Length], 8 |
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140 | |||
141 | ; Look for a socket where |
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142 | ; IP Packet UDP Destination Port = local Port |
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143 | ; IP Packet SA = Remote IP |
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144 | |||
3647 | hidnplayr | 145 | pusha |
146 | mov ecx, socket_mutex |
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147 | call mutex_lock |
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148 | popa |
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149 | |||
3545 | hidnplayr | 150 | mov cx, [esi + UDP_header.SourcePort] |
151 | mov dx, [esi + UDP_header.DestinationPort] |
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152 | mov edi, [edi + 4] ; ipv4 source address |
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153 | mov eax, net_sockets |
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154 | |||
155 | .next_socket: |
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156 | mov eax, [eax + SOCKET.NextPtr] |
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157 | or eax, eax |
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3647 | hidnplayr | 158 | jz .dump_ |
3545 | hidnplayr | 159 | |
160 | cmp [eax + SOCKET.Domain], AF_INET4 |
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161 | jne .next_socket |
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162 | |||
163 | cmp [eax + SOCKET.Protocol], IP_PROTO_UDP |
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164 | jne .next_socket |
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165 | |||
166 | cmp [eax + UDP_SOCKET.LocalPort], dx |
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167 | jne .next_socket |
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168 | |||
3556 | hidnplayr | 169 | DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: socket=%x\n", eax |
3545 | hidnplayr | 170 | |
3647 | hidnplayr | 171 | pusha |
172 | mov ecx, socket_mutex |
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173 | call mutex_unlock |
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174 | popa |
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175 | |||
3545 | hidnplayr | 176 | ;;; TODO: when packet is processed, check more sockets! |
177 | |||
178 | ; cmp [eax + IP_SOCKET.RemoteIP], 0xffffffff |
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179 | ; je @f |
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180 | ; cmp [eax + IP_SOCKET.RemoteIP], edi |
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181 | ; jne .next_socket |
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182 | ; @@: |
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183 | ; |
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184 | ; FIXME: UDP should check remote IP, but not under all circumstances! |
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185 | |||
186 | cmp [eax + UDP_SOCKET.firstpacket], 0 |
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187 | je .updateport |
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188 | |||
189 | cmp [eax + UDP_SOCKET.RemotePort], cx |
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190 | jne .dump |
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191 | |||
192 | pusha |
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193 | lea ecx, [eax + SOCKET.mutex] |
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194 | call mutex_lock |
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195 | popa |
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196 | |||
197 | .updatesock: |
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3643 | hidnplayr | 198 | call NET_ptr_to_num4 |
199 | inc [UDP_PACKETS_RX + edi] |
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3545 | hidnplayr | 200 | |
201 | movzx ecx, [esi + UDP_header.Length] |
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202 | sub ecx, sizeof.UDP_header |
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203 | add esi, sizeof.UDP_header |
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204 | |||
205 | jmp SOCKET_input |
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206 | |||
207 | .updateport: |
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208 | pusha |
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209 | lea ecx, [eax + SOCKET.mutex] |
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210 | call mutex_lock |
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211 | popa |
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212 | |||
3556 | hidnplayr | 213 | DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: new remote port=%x\n", cx ; FIXME: find a way to print big endian values with debugf |
3545 | hidnplayr | 214 | mov [eax + UDP_SOCKET.RemotePort], cx |
215 | inc [eax + UDP_SOCKET.firstpacket] |
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216 | |||
217 | jmp .updatesock |
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218 | |||
3647 | hidnplayr | 219 | .dump_: |
3545 | hidnplayr | 220 | |
3647 | hidnplayr | 221 | pusha |
222 | mov ecx, socket_mutex |
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223 | call mutex_unlock |
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224 | popa |
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225 | |||
226 | DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: no socket found\n" |
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227 | |||
228 | jmp .dump |
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229 | |||
3545 | hidnplayr | 230 | .checksum_mismatch: |
3556 | hidnplayr | 231 | DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: checksum mismatch\n" |
3545 | hidnplayr | 232 | |
233 | .dump: |
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234 | call kernel_free |
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235 | add esp, 4 ; pop (balance stack) |
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3556 | hidnplayr | 236 | DEBUGF DEBUG_NETWORK_VERBOSE,"UDP_input: dumping\n" |
3545 | hidnplayr | 237 | |
238 | ret |
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239 | |||
240 | |||
241 | |||
242 | |||
243 | ;----------------------------------------------------------------- |
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244 | ; |
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245 | ; UDP_output |
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246 | ; |
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247 | ; IN: eax = socket pointer |
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248 | ; ecx = number of bytes to send |
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249 | ; esi = pointer to data |
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250 | ; |
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251 | ;----------------------------------------------------------------- |
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252 | |||
253 | align 4 |
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254 | UDP_output: |
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255 | |||
3556 | hidnplayr | 256 | DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_output: socket=%x bytes=%u data_ptr=%x\n", eax, ecx, esi |
3545 | hidnplayr | 257 | |
258 | mov dx, [eax + UDP_SOCKET.RemotePort] |
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3556 | hidnplayr | 259 | DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_output: remote port=%x, ", dx ; FIXME: find a way to print big endian values with debugf |
3545 | hidnplayr | 260 | rol edx, 16 |
261 | mov dx, [eax + UDP_SOCKET.LocalPort] |
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3556 | hidnplayr | 262 | DEBUGF DEBUG_NETWORK_VERBOSE, "local port=%x\n", dx |
3545 | hidnplayr | 263 | |
264 | sub esp, 8 ; Data ptr and data size will be placed here |
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265 | push edx esi |
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266 | mov ebx, [eax + SOCKET.device] |
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267 | mov edx, [eax + IP_SOCKET.LocalIP] |
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268 | mov eax, [eax + IP_SOCKET.RemoteIP] |
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269 | mov di, IP_PROTO_UDP shl 8 + 128 |
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270 | add ecx, sizeof.UDP_header |
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271 | call IPv4_output |
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272 | jz .fail |
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273 | mov [esp + 8], eax ; pointer to buffer start |
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274 | mov [esp + 8 + 4], edx ; buffer size |
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275 | |||
276 | mov [edi + UDP_header.Length], cx |
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277 | rol [edi + UDP_header.Length], 8 |
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278 | |||
279 | pop esi |
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280 | push edi ecx |
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281 | sub ecx, sizeof.UDP_header |
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282 | add edi, sizeof.UDP_header |
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283 | shr ecx, 2 |
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284 | rep movsd |
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285 | mov ecx, [esp] |
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286 | and ecx, 3 |
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287 | rep movsb |
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288 | pop ecx edi |
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289 | |||
290 | pop dword [edi + UDP_header.SourcePort] |
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291 | |||
292 | ; Checksum |
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293 | mov esi, edi |
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294 | mov [edi + UDP_header.Checksum], 0 |
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295 | UDP_checksum (edi-4), (edi-8) ; FIXME: IPv4 packet could have options.. |
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296 | |||
3556 | hidnplayr | 297 | DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_output: sending with device %x\n", ebx |
3545 | hidnplayr | 298 | call [ebx + NET_DEVICE.transmit] |
299 | test eax, eax |
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300 | jnz @f |
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3643 | hidnplayr | 301 | call NET_ptr_to_num4 |
302 | inc [UDP_PACKETS_TX + edi] |
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3545 | hidnplayr | 303 | @@: |
304 | |||
305 | ret |
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306 | |||
307 | .fail: |
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3556 | hidnplayr | 308 | DEBUGF DEBUG_NETWORK_ERROR, "UDP_output: failed\n" |
3545 | hidnplayr | 309 | add esp, 4+4+8 |
310 | or eax, -1 |
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311 | ret |
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312 | |||
313 | |||
314 | |||
315 | ;--------------------------------------------------------------------------- |
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316 | ; |
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317 | ; UDP_API |
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318 | ; |
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319 | ; This function is called by system function 75 |
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320 | ; |
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321 | ; IN: subfunction number in bl |
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322 | ; device number in bh |
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323 | ; ecx, edx, .. depends on subfunction |
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324 | ; |
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325 | ; OUT: |
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326 | ; |
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327 | ;--------------------------------------------------------------------------- |
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328 | |||
329 | align 4 |
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330 | UDP_api: |
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331 | |||
332 | movzx eax, bh |
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333 | shl eax, 2 |
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334 | |||
335 | test bl, bl |
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336 | jz .packets_tx ; 0 |
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337 | dec bl |
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338 | jz .packets_rx ; 1 |
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339 | |||
340 | .error: |
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341 | mov eax, -1 |
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342 | ret |
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343 | |||
344 | .packets_tx: |
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345 | mov eax, [UDP_PACKETS_TX + eax] |
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346 | ret |
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347 | |||
348 | .packets_rx: |
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349 | mov eax, [UDP_PACKETS_RX + eax] |
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350 | ret |