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1159 | hidnplayr | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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1196 | hidnplayr | 3 | ;; Copyright (C) KolibriOS team 2004-2009. 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: 1208 $ |
1159 | hidnplayr | 18 | |
19 | |||
20 | struct UDP_Packet |
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21 | .SourcePort dw ? |
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22 | .DestinationPort dw ? |
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23 | .Length dw ? ; Length of (UDP Header + Data) |
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24 | .Checksum dw ? |
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25 | .Data: |
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26 | |||
27 | ends |
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28 | |||
29 | |||
30 | align 4 |
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31 | uglobal |
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32 | UDP_PACKETS_TX rd MAX_IP |
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33 | UDP_PACKETS_RX rd MAX_IP |
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34 | endg |
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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 | ; IN: / |
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44 | ; OUT: / |
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45 | ; |
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46 | ;----------------------------------------------------------------- |
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47 | align 4 |
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48 | UDP_init: |
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49 | |||
50 | xor eax, eax |
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51 | mov edi, UDP_PACKETS_TX |
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52 | mov ecx, 2*MAX_IP |
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53 | rep stosd |
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54 | |||
55 | ret |
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56 | |||
57 | |||
58 | |||
59 | ;----------------------------------------------------------------- |
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60 | ; |
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61 | ; UDP_Handler: |
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62 | ; |
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63 | ; Called by IPv4_handler, |
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64 | ; this procedure will inject the udp data diagrams in the application sockets. |
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65 | ; |
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66 | ; IN: Pointer to buffer in [esp] |
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67 | ; size of buffer in [esp+4] |
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68 | ; pointer to device struct in ebx |
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69 | ; UDP Packet size in ecx |
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70 | ; pointer to UDP Packet data in edx |
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71 | ; OUT: / |
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72 | ; |
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73 | ;----------------------------------------------------------------- |
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1206 | hidnplayr | 74 | align 4 |
1196 | hidnplayr | 75 | UDP_handler: |
1159 | hidnplayr | 76 | |
77 | DEBUGF 1,"UDP_Handler\n" |
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1206 | hidnplayr | 78 | ; TODO: First validate the header & checksum! |
1159 | hidnplayr | 79 | |
80 | ; Look for a socket where |
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81 | ; IP Packet UDP Destination Port = local Port |
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82 | ; IP Packet SA = Remote IP |
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83 | |||
1206 | hidnplayr | 84 | mov eax, net_sockets |
1159 | hidnplayr | 85 | .try_more: |
1206 | hidnplayr | 86 | mov bx , [edx + UDP_Packet.DestinationPort] ; get the local port from the IP Packet's UDP header |
1159 | hidnplayr | 87 | .next_socket: |
1206 | hidnplayr | 88 | mov eax, [eax + SOCKET.NextPtr] |
89 | or eax, eax |
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1159 | hidnplayr | 90 | jz .dump |
1206 | hidnplayr | 91 | cmp [eax + SOCKET.Domain], AF_INET4 |
1159 | hidnplayr | 92 | jne .next_socket |
1206 | hidnplayr | 93 | cmp [eax + SOCKET.Type], IP_PROTO_UDP |
1159 | hidnplayr | 94 | jne .next_socket |
1206 | hidnplayr | 95 | cmp [eax + SOCKET.LocalPort], bx |
96 | jne .next_socket |
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1159 | hidnplayr | 97 | |
1208 | hidnplayr | 98 | DEBUGF 1,"found socket with matching domain, type and localport\n" |
99 | |||
1159 | hidnplayr | 100 | ; For dhcp, we must allow any remote server to respond. |
101 | ; I will accept the first incoming response to be the one |
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102 | ; I bind to, if the socket is opened with a destination IP address of |
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103 | ; 255.255.255.255 |
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1206 | hidnplayr | 104 | cmp [eax + SOCKET.RemoteIP], 0xffffffff |
105 | je .ok1 |
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1159 | hidnplayr | 106 | |
1206 | hidnplayr | 107 | mov ebx, [esp] |
1208 | hidnplayr | 108 | mov ebx, [ebx + ETH_FRAME.Data + IPv4_Packet.SourceAddress] ; get the Source address from the IP Packet FIXME |
109 | cmp [eax + SOCKET.RemoteIP], ebx |
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1159 | hidnplayr | 110 | jne .try_more ; Quit if the source IP is not valid, check for more sockets with this IP/PORT combination |
111 | |||
1208 | hidnplayr | 112 | |
113 | DEBUGF 1,"Remote Ip matches\n" |
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1206 | hidnplayr | 114 | .ok1: |
1159 | hidnplayr | 115 | |
1206 | hidnplayr | 116 | mov bx, [edx + UDP_Packet.SourcePort] ; Remote port must be 0, or equal to sourceport of packet |
1159 | hidnplayr | 117 | |
1208 | hidnplayr | 118 | cmp [eax + SOCKET.RemotePort], 0 |
1206 | hidnplayr | 119 | je .ok2 |
1159 | hidnplayr | 120 | |
1206 | hidnplayr | 121 | cmp [eax + SOCKET.RemotePort], bx |
122 | jne .dump |
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1159 | hidnplayr | 123 | |
1206 | hidnplayr | 124 | .ok2: |
1159 | hidnplayr | 125 | |
1206 | hidnplayr | 126 | DEBUGF 1,"Found valid UDP packet for socket %x\n", eax |
127 | lea esi, [edx + UDP_Packet.Data] |
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128 | movzx ecx, [edx + UDP_Packet.Length] |
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129 | rol cx , 8 |
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130 | sub cx , UDP_Packet.Data |
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131 | mov dx , bx |
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1159 | hidnplayr | 132 | |
1206 | hidnplayr | 133 | call socket_internal_receiver |
1159 | hidnplayr | 134 | |
1206 | hidnplayr | 135 | inc [UDP_PACKETS_RX] |
1159 | hidnplayr | 136 | |
1206 | hidnplayr | 137 | .dump: |
138 | DEBUGF 1,"Dumping UDP packet\n" |
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1159 | hidnplayr | 139 | call kernel_free |
140 | add esp, 4 ; pop (balance stack) |
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141 | |||
142 | ret |
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143 | |||
144 | |||
145 | |||
146 | |||
147 | ;----------------------------------------------------------------- |
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148 | ; |
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149 | ; Note: UDP works only on top of IP protocol :) |
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150 | ; |
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151 | ; IN: eax = dest ip |
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152 | ; ebx = source ip |
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153 | ; ecx = data length |
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1196 | hidnplayr | 154 | ; edx = remote port shl 16 + local port (both in INET order) |
1159 | hidnplayr | 155 | ; esi = data offset |
156 | ; |
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157 | ;----------------------------------------------------------------- |
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158 | |||
1196 | hidnplayr | 159 | UDP_create_packet: |
1159 | hidnplayr | 160 | |
1206 | hidnplayr | 161 | DEBUGF 1,"Create UDP Packet (size=%u)\n",ecx |
1159 | hidnplayr | 162 | |
163 | push edx esi |
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164 | |||
165 | add ecx, UDP_Packet.Data |
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166 | mov di , IP_PROTO_UDP |
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167 | |||
168 | ; dx = fragment id |
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169 | |||
1196 | hidnplayr | 170 | call IPv4_create_packet ; TODO: figure out a way to choose between IPv4 and IPv6 |
1159 | hidnplayr | 171 | cmp edi, -1 |
1206 | hidnplayr | 172 | je .fail |
1159 | hidnplayr | 173 | |
174 | mov byte[edi + UDP_Packet.Length], ch |
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175 | mov byte[edi + UDP_Packet.Length+1], cl |
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1197 | clevermous | 176 | sub ecx , UDP_Packet.Data |
1159 | hidnplayr | 177 | |
178 | pop esi |
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179 | push edi |
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180 | add edi, UDP_Packet.Data |
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181 | push cx |
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182 | shr ecx, 2 |
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183 | rep movsd |
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184 | pop cx |
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185 | and cx , 3 |
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186 | rep movsb |
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187 | pop edi |
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188 | |||
189 | pop ecx |
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190 | mov dword [edi + UDP_Packet.SourcePort], ecx ; notice: we write both port's at once |
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191 | |||
192 | mov [edi + UDP_Packet.Checksum], 0 |
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193 | |||
194 | ; TODO: calculate checksum using Pseudo-header (However, using a 0 as checksum shouldnt generate any errors :) |
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195 | |||
1206 | hidnplayr | 196 | inc [UDP_PACKETS_TX] |
197 | |||
198 | push edx eax ; TODO: make this work on other protocols besides ethernet |
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1159 | hidnplayr | 199 | DEBUGF 1,"Sending UDP Packet to device %x\n", ebx ; |
200 | jmp ETH_Sender ; |
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201 | |||
202 | .exit: |
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203 | ret |
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204 | |||
1206 | hidnplayr | 205 | .fail: |
206 | ; todo: queue the packet |
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207 | add esp, 8 |
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208 | ret |
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1159 | hidnplayr | 209 | |
210 | |||
1206 | hidnplayr | 211 | |
1159 | hidnplayr | 212 | ;--------------------------------------------------------------------------- |
213 | ; |
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214 | ; UDP_API |
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215 | ; |
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216 | ; This function is called by system function 75 |
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217 | ; |
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218 | ; IN: subfunction number in bl |
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219 | ; device number in bh |
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220 | ; ecx, edx, .. depends on subfunction |
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221 | ; |
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222 | ; OUT: |
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223 | ; |
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224 | ;--------------------------------------------------------------------------- |
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225 | |||
226 | align 4 |
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227 | UDP_API: |
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228 | |||
229 | movzx eax, bh |
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230 | shl eax, 2 |
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231 | |||
232 | test bl, bl |
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233 | jz .packets_tx ; 0 |
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234 | dec bl |
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235 | jz .packets_rx ; 1 |
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236 | |||
237 | .error: |
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238 | mov eax, -1 |
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239 | ret |
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240 | |||
241 | .packets_tx: |
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242 | add eax, UDP_PACKETS_TX |
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243 | mov eax, [eax] |
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244 | ret |
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245 | |||
246 | .packets_rx: |
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247 | add eax, UDP_PACKETS_RX |
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248 | mov eax, [eax] |
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249 | ret |