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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: 1483 $ |
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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1482 | hidnplayr | 70 | ; pointer to UDP Packet in edx |
1159 | hidnplayr | 71 | ; OUT: / |
72 | ; |
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73 | ;----------------------------------------------------------------- |
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1206 | hidnplayr | 74 | align 4 |
1196 | hidnplayr | 75 | UDP_handler: |
1159 | hidnplayr | 76 | |
1483 | hidnplayr | 77 | DEBUGF 1,"UDP_Handler, checksum:%x, size:%u\n", [edx+UDP_Packet.Checksum]:4, ecx |
1473 | hidnplayr | 78 | |
1482 | hidnplayr | 79 | ; First validate, checksum: |
80 | cmp [edx + UDP_Packet.Checksum], 0 |
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81 | jz .no_checksum |
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1159 | hidnplayr | 82 | |
1483 | hidnplayr | 83 | push edx |
1249 | hidnplayr | 84 | |
1482 | hidnplayr | 85 | push esi |
1249 | hidnplayr | 86 | push edi |
87 | mov esi, edx |
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1482 | hidnplayr | 88 | call UDP_checksum |
1249 | hidnplayr | 89 | |
1483 | hidnplayr | 90 | pop edx |
1249 | hidnplayr | 91 | |
1482 | hidnplayr | 92 | cmp [edx + UDP_Packet.Checksum], 0 |
93 | jnz .checksum_mismatch |
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1249 | hidnplayr | 94 | |
1473 | hidnplayr | 95 | .no_checksum: |
96 | DEBUGF 1,"UDP Checksum is correct\n" |
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97 | |||
1159 | hidnplayr | 98 | ; Look for a socket where |
99 | ; IP Packet UDP Destination Port = local Port |
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100 | ; IP Packet SA = Remote IP |
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101 | |||
1206 | hidnplayr | 102 | mov eax, net_sockets |
1159 | hidnplayr | 103 | .try_more: |
1473 | hidnplayr | 104 | mov si , [edx + UDP_Packet.DestinationPort] ; get the local port from the IP Packet's UDP header |
1159 | hidnplayr | 105 | .next_socket: |
1249 | hidnplayr | 106 | mov eax, [eax + SOCKET_head.NextPtr] |
1206 | hidnplayr | 107 | or eax, eax |
1159 | hidnplayr | 108 | jz .dump |
1249 | hidnplayr | 109 | cmp [eax + SOCKET_head.Domain], AF_INET4 |
1159 | hidnplayr | 110 | jne .next_socket |
1249 | hidnplayr | 111 | cmp [eax + SOCKET_head.Type], IP_PROTO_UDP |
1159 | hidnplayr | 112 | jne .next_socket |
1473 | hidnplayr | 113 | cmp [eax + SOCKET_head.end + IPv4_SOCKET.end + UDP_SOCKET.LocalPort], si |
1206 | hidnplayr | 114 | jne .next_socket |
1159 | hidnplayr | 115 | |
1473 | hidnplayr | 116 | DEBUGF 1,"found socket with matching domain, type and localport\n" |
1208 | hidnplayr | 117 | |
1159 | hidnplayr | 118 | ; For dhcp, we must allow any remote server to respond. |
119 | ; I will accept the first incoming response to be the one |
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120 | ; I bind to, if the socket is opened with a destination IP address of |
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121 | ; 255.255.255.255 |
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1249 | hidnplayr | 122 | cmp [eax + SOCKET_head.end + IPv4_SOCKET.RemoteIP], 0xffffffff |
1206 | hidnplayr | 123 | je .ok1 |
1159 | hidnplayr | 124 | |
1483 | hidnplayr | 125 | ; mov esi, [esp] ; start of data (ethernet header) |
126 | ; mov esi, [esi + ETH_FRAME.Data + IPv4_Packet.SourceAddress] ; get the Source address from the IP Packet FIXME |
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127 | cmp [eax + SOCKET_head.end + IPv4_SOCKET.RemoteIP], edi ;esi |
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1159 | hidnplayr | 128 | jne .try_more ; Quit if the source IP is not valid, check for more sockets with this IP/PORT combination |
129 | |||
1208 | hidnplayr | 130 | |
1473 | hidnplayr | 131 | DEBUGF 1,"Remote Ip matches\n" |
1206 | hidnplayr | 132 | .ok1: |
1159 | hidnplayr | 133 | |
1335 | hidnplayr | 134 | cmp [eax + SOCKET_head.end + IPv4_SOCKET.end + UDP_SOCKET.firstpacket], 0 |
135 | jz .updateport |
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1159 | hidnplayr | 136 | |
1473 | hidnplayr | 137 | mov si, [edx + UDP_Packet.SourcePort] |
138 | cmp [eax + SOCKET_head.end + IPv4_SOCKET.end + UDP_SOCKET.RemotePort], si |
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1206 | hidnplayr | 139 | jne .dump |
1159 | hidnplayr | 140 | |
1473 | hidnplayr | 141 | push ebx |
1337 | hidnplayr | 142 | lea ebx, [eax + SOCKET_head.lock] |
143 | call wait_mutex |
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1473 | hidnplayr | 144 | pop ebx |
1337 | hidnplayr | 145 | |
1206 | hidnplayr | 146 | .ok2: |
1159 | hidnplayr | 147 | |
1473 | hidnplayr | 148 | DEBUGF 1,"Found valid UDP packet for socket %x\n", eax |
1206 | hidnplayr | 149 | lea esi, [edx + UDP_Packet.Data] |
150 | movzx ecx, [edx + UDP_Packet.Length] |
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151 | rol cx , 8 |
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152 | sub cx , UDP_Packet.Data |
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1159 | hidnplayr | 153 | |
1206 | hidnplayr | 154 | inc [UDP_PACKETS_RX] |
1159 | hidnplayr | 155 | |
1249 | hidnplayr | 156 | pop edi |
157 | add esp, 4 |
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158 | |||
159 | sub esi, edi |
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160 | xchg esi, edi |
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161 | jmp socket_internal_receiver |
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162 | |||
163 | |||
1335 | hidnplayr | 164 | .updateport: |
165 | |||
1473 | hidnplayr | 166 | push ebx |
1337 | hidnplayr | 167 | lea ebx, [eax + SOCKET_head.lock] |
168 | call wait_mutex |
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1473 | hidnplayr | 169 | pop ebx |
1337 | hidnplayr | 170 | |
1473 | hidnplayr | 171 | mov si, [edx + UDP_Packet.SourcePort] |
172 | DEBUGF 1,"Changing remote port to: %x\n", si |
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173 | mov [eax + SOCKET_head.end + IPv4_SOCKET.end + UDP_SOCKET.RemotePort], si |
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1335 | hidnplayr | 174 | inc [eax + SOCKET_head.end + IPv4_SOCKET.end + UDP_SOCKET.firstpacket] |
175 | |||
176 | jmp .ok2 |
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177 | |||
1483 | hidnplayr | 178 | |
1473 | hidnplayr | 179 | .checksum_mismatch: |
180 | |||
181 | DEBUGF 2,"UDP_Handler - checksum mismatch\n" |
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182 | |||
1482 | hidnplayr | 183 | ; mov esi, edx |
184 | ; @@: ; |
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185 | ; lodsb ; |
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186 | ; DEBUGF 2,"%x ", eax:2 ; |
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187 | ; loop @r ; |
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1473 | hidnplayr | 188 | |
1206 | hidnplayr | 189 | .dump: |
1159 | hidnplayr | 190 | call kernel_free |
191 | add esp, 4 ; pop (balance stack) |
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1473 | hidnplayr | 192 | DEBUGF 2,"UDP_Handler - dumping\n" |
1159 | hidnplayr | 193 | |
194 | ret |
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195 | |||
196 | |||
197 | |||
198 | |||
199 | ;----------------------------------------------------------------- |
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200 | ; |
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1249 | hidnplayr | 201 | ; UDP_socket_send |
1159 | hidnplayr | 202 | ; |
1249 | hidnplayr | 203 | ; IN: eax = socket pointer |
204 | ; ecx = number of bytes to send |
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205 | ; esi = pointer to data |
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1159 | hidnplayr | 206 | ; |
207 | ;----------------------------------------------------------------- |
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208 | |||
1249 | hidnplayr | 209 | align 4 |
210 | UDP_socket_send: |
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1159 | hidnplayr | 211 | |
1249 | hidnplayr | 212 | mov edx, dword [eax + SOCKET_head.end + IPv4_SOCKET.end + UDP_SOCKET.LocalPort] ; load local port and remote port at once |
213 | DEBUGF 1,"local port: %x, remote port: %x\n",\ |
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214 | [eax + SOCKET_head.end + IPv4_SOCKET.end + UDP_SOCKET.LocalPort]:4,\ |
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215 | [eax + SOCKET_head.end + IPv4_SOCKET.end + UDP_SOCKET.RemotePort]:4 |
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216 | mov ebx, [eax + SOCKET_head.end + IPv4_SOCKET.LocalIP] |
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217 | mov eax, [eax + SOCKET_head.end + IPv4_SOCKET.RemoteIP] |
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218 | |||
1473 | hidnplayr | 219 | DEBUGF 1,"Create UDP Packet (size=%u)\n",ecx |
1159 | hidnplayr | 220 | |
1249 | hidnplayr | 221 | mov di , IP_PROTO_UDP |
1482 | hidnplayr | 222 | sub esp, 8 ; Data ptr and data size will be placed here |
1159 | hidnplayr | 223 | add ecx, UDP_Packet.Data |
224 | |||
1249 | hidnplayr | 225 | ; TODO: fill in: dx = fragment id |
1159 | hidnplayr | 226 | |
1249 | hidnplayr | 227 | push edx esi |
1196 | hidnplayr | 228 | call IPv4_create_packet ; TODO: figure out a way to choose between IPv4 and IPv6 |
1159 | hidnplayr | 229 | cmp edi, -1 |
1206 | hidnplayr | 230 | je .fail |
1159 | hidnplayr | 231 | |
1482 | hidnplayr | 232 | mov [esp + 8], eax ; pointer to buffer start |
233 | mov [esp + 8 + 4], edx ; buffer size |
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1159 | hidnplayr | 234 | |
1249 | hidnplayr | 235 | rol cx, 8 |
236 | mov [edi + UDP_Packet.Length], cx |
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237 | ror cx, 8 |
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238 | |||
1159 | hidnplayr | 239 | pop esi |
1249 | hidnplayr | 240 | push edi ecx |
241 | sub ecx, UDP_Packet.Data |
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1159 | hidnplayr | 242 | add edi, UDP_Packet.Data |
243 | shr ecx, 2 |
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244 | rep movsd |
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1249 | hidnplayr | 245 | mov ecx, [esp] |
1251 | clevermous | 246 | and ecx, 3 |
1159 | hidnplayr | 247 | rep movsb |
1249 | hidnplayr | 248 | pop ecx edi |
1159 | hidnplayr | 249 | |
1254 | hidnplayr | 250 | pop dword [edi + UDP_Packet.SourcePort] ; fill in both portnumbers |
1249 | hidnplayr | 251 | mov [edi + UDP_Packet.Checksum], 0 ; set it to zero, to calculate checksum |
1159 | hidnplayr | 252 | |
1482 | hidnplayr | 253 | ; Checksum |
1249 | hidnplayr | 254 | mov esi, edi |
1335 | hidnplayr | 255 | pushd [edi-4] ; destination address ; TODO: fix this, IPv4 packet could have options.. |
1254 | hidnplayr | 256 | pushd [edi-8] ; source address |
1482 | hidnplayr | 257 | call UDP_checksum |
1159 | hidnplayr | 258 | |
1206 | hidnplayr | 259 | inc [UDP_PACKETS_TX] |
260 | |||
1482 | hidnplayr | 261 | DEBUGF 1,"Sending UDP Packet to device %x\n", ebx |
262 | jmp ETH_sender |
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1159 | hidnplayr | 263 | |
1206 | hidnplayr | 264 | .fail: |
265 | ; todo: queue the packet |
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1249 | hidnplayr | 266 | add esp, 8+12+8 |
1206 | hidnplayr | 267 | ret |
1159 | hidnplayr | 268 | |
269 | |||
1206 | hidnplayr | 270 | |
1249 | hidnplayr | 271 | |
1482 | hidnplayr | 272 | ;----------------------------------------------------------------- |
273 | ; |
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274 | ; checksum_udp |
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275 | ; |
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276 | ; This is the fast procedure to create or check a UDP header |
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277 | ; - To create a new checksum, the checksum field must be set to 0 before computation |
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278 | ; - To check an existing checksum, leave the checksum as is, |
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279 | ; and it will be 0 after this procedure, if it was correct |
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280 | ; |
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281 | ; IN: push source ip |
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282 | ; push dest ip |
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283 | ; esi = packet ptr |
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284 | ; |
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285 | ; OUT: checksum is filled in in packet! (but also in dx) |
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286 | ; |
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287 | ;----------------------------------------------------------------- |
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288 | |||
289 | align 4 |
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290 | UDP_checksum: |
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291 | |||
292 | ; Pseudoheader |
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293 | mov edx, IP_PROTO_UDP ; NO shl 8 here ! (it took me ages to figure this one out) |
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294 | |||
295 | add dl, [esp+1+4] |
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296 | adc dh, [esp+0+4] |
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297 | adc dl, [esp+3+4] |
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298 | adc dh, [esp+2+4] |
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299 | |||
300 | adc dl, [esp+1+8] |
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301 | adc dh, [esp+0+8] |
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302 | adc dl, [esp+3+8] |
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303 | adc dh, [esp+2+8] |
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304 | |||
305 | |||
1483 | hidnplayr | 306 | adc dl, cl ; byte[esi+UDP_Packet.Length+1] |
307 | adc dh, ch ; byte[esi+UDP_Packet.Length+0] |
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308 | |||
1482 | hidnplayr | 309 | ; Done with pseudoheader, now do real header |
310 | adc dl, byte[esi+UDP_Packet.SourcePort+1] |
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311 | adc dh, byte[esi+UDP_Packet.SourcePort+0] |
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312 | |||
313 | adc dl, byte[esi+UDP_Packet.DestinationPort+1] |
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314 | adc dh, byte[esi+UDP_Packet.DestinationPort+0] |
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315 | |||
316 | adc dl, byte[esi+UDP_Packet.Length+1] |
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317 | adc dh, byte[esi+UDP_Packet.Length+0] |
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318 | |||
319 | adc edx, 0 |
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320 | |||
321 | ; Done with header, now do data |
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322 | push esi |
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323 | movzx ecx, [esi+UDP_Packet.Length] |
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324 | rol cx , 8 |
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325 | sub cx , UDP_Packet.Data |
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326 | add esi, UDP_Packet.Data |
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327 | |||
328 | call checksum_1 |
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329 | call checksum_2 |
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330 | pop esi |
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331 | |||
332 | neg [esi+UDP_Packet.Checksum] ; zero will stay zero so we just get the checksum |
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333 | add [esi+UDP_Packet.Checksum], dx ; , else we will get (new checksum - old checksum) in the end, wich should be 0 :) |
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334 | |||
335 | ret 8 |
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336 | |||
337 | |||
338 | |||
339 | |||
1159 | hidnplayr | 340 | ;--------------------------------------------------------------------------- |
341 | ; |
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342 | ; UDP_API |
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343 | ; |
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344 | ; This function is called by system function 75 |
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345 | ; |
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346 | ; IN: subfunction number in bl |
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347 | ; device number in bh |
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348 | ; ecx, edx, .. depends on subfunction |
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349 | ; |
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350 | ; OUT: |
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351 | ; |
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352 | ;--------------------------------------------------------------------------- |
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353 | |||
354 | align 4 |
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355 | UDP_API: |
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356 | |||
357 | movzx eax, bh |
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358 | shl eax, 2 |
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359 | |||
360 | test bl, bl |
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361 | jz .packets_tx ; 0 |
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362 | dec bl |
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363 | jz .packets_rx ; 1 |
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364 | |||
365 | .error: |
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366 | mov eax, -1 |
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367 | ret |
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368 | |||
369 | .packets_tx: |
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370 | add eax, UDP_PACKETS_TX |
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371 | mov eax, [eax] |
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372 | ret |
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373 | |||
374 | .packets_rx: |
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375 | add eax, UDP_PACKETS_RX |
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376 | mov eax, [eax] |
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377 | ret |