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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: 1251 $ |
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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1249 | hidnplayr | 78 | ; First validate, checksum: |
1159 | hidnplayr | 79 | |
1249 | hidnplayr | 80 | DEBUGF 1,"Real UDP checksum: %x\n", [edx + UDP_Packet.Checksum]:4 |
81 | mov [edx + UDP_Packet.Checksum], 0 |
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82 | |||
83 | pusha |
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84 | |||
85 | rol cx, 8 |
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86 | push cx |
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87 | rol cx, 8 |
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88 | push word IP_PROTO_UDP shl 8 |
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89 | push edi |
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90 | push esi |
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91 | |||
92 | mov esi, edx |
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93 | xor edx, edx |
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94 | call checksum_1 |
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95 | ; Checksum for pseudoheader |
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96 | mov ecx, 12 |
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97 | mov esi, esp |
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98 | call checksum_1 |
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99 | add esp, 12 |
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100 | call checksum_2 |
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101 | |||
102 | popa |
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103 | |||
104 | |||
105 | |||
1159 | hidnplayr | 106 | ; Look for a socket where |
107 | ; IP Packet UDP Destination Port = local Port |
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108 | ; IP Packet SA = Remote IP |
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109 | |||
1206 | hidnplayr | 110 | mov eax, net_sockets |
1159 | hidnplayr | 111 | .try_more: |
1206 | hidnplayr | 112 | mov bx , [edx + UDP_Packet.DestinationPort] ; get the local port from the IP Packet's UDP header |
1159 | hidnplayr | 113 | .next_socket: |
1249 | hidnplayr | 114 | mov eax, [eax + SOCKET_head.NextPtr] |
1206 | hidnplayr | 115 | or eax, eax |
1159 | hidnplayr | 116 | jz .dump |
1249 | hidnplayr | 117 | cmp [eax + SOCKET_head.Domain], AF_INET4 |
1159 | hidnplayr | 118 | jne .next_socket |
1249 | hidnplayr | 119 | cmp [eax + SOCKET_head.Type], IP_PROTO_UDP |
1159 | hidnplayr | 120 | jne .next_socket |
1249 | hidnplayr | 121 | cmp [eax + SOCKET_head.end + IPv4_SOCKET.end + UDP_SOCKET.LocalPort], bx |
1206 | hidnplayr | 122 | jne .next_socket |
1159 | hidnplayr | 123 | |
1208 | hidnplayr | 124 | DEBUGF 1,"found socket with matching domain, type and localport\n" |
125 | |||
1159 | hidnplayr | 126 | ; For dhcp, we must allow any remote server to respond. |
127 | ; I will accept the first incoming response to be the one |
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128 | ; I bind to, if the socket is opened with a destination IP address of |
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129 | ; 255.255.255.255 |
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1249 | hidnplayr | 130 | cmp [eax + SOCKET_head.end + IPv4_SOCKET.RemoteIP], 0xffffffff |
1206 | hidnplayr | 131 | je .ok1 |
1159 | hidnplayr | 132 | |
1206 | hidnplayr | 133 | mov ebx, [esp] |
1208 | hidnplayr | 134 | mov ebx, [ebx + ETH_FRAME.Data + IPv4_Packet.SourceAddress] ; get the Source address from the IP Packet FIXME |
1249 | hidnplayr | 135 | cmp [eax + SOCKET_head.end + IPv4_SOCKET.RemoteIP], ebx |
1159 | hidnplayr | 136 | jne .try_more ; Quit if the source IP is not valid, check for more sockets with this IP/PORT combination |
137 | |||
1208 | hidnplayr | 138 | |
139 | DEBUGF 1,"Remote Ip matches\n" |
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1206 | hidnplayr | 140 | .ok1: |
1159 | hidnplayr | 141 | |
1206 | hidnplayr | 142 | mov bx, [edx + UDP_Packet.SourcePort] ; Remote port must be 0, or equal to sourceport of packet |
1159 | hidnplayr | 143 | |
1249 | hidnplayr | 144 | cmp [eax + SOCKET_head.end + IPv4_SOCKET.end + UDP_SOCKET.RemotePort], 0 |
1206 | hidnplayr | 145 | je .ok2 |
1159 | hidnplayr | 146 | |
1249 | hidnplayr | 147 | cmp [eax + SOCKET_head.end + IPv4_SOCKET.end + UDP_SOCKET.RemotePort], bx |
1206 | hidnplayr | 148 | jne .dump |
1159 | hidnplayr | 149 | |
1206 | hidnplayr | 150 | .ok2: |
1159 | hidnplayr | 151 | |
1206 | hidnplayr | 152 | DEBUGF 1,"Found valid UDP packet for socket %x\n", eax |
153 | lea esi, [edx + UDP_Packet.Data] |
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154 | movzx ecx, [edx + UDP_Packet.Length] |
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155 | rol cx , 8 |
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156 | sub cx , UDP_Packet.Data |
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157 | mov dx , bx |
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1159 | hidnplayr | 158 | |
159 | |||
1249 | hidnplayr | 160 | lea ebx, [eax + SOCKET_head.lock] |
161 | call wait_mutex |
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162 | mov [eax + SOCKET_head.end + IPv4_SOCKET.end + UDP_SOCKET.RemotePort], dx ; update remote port number |
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163 | mov [eax + SOCKET_head.end + IPv4_SOCKET.RemoteIP], edi |
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1206 | hidnplayr | 164 | inc [UDP_PACKETS_RX] |
1159 | hidnplayr | 165 | |
1249 | hidnplayr | 166 | pop edi |
167 | add esp, 4 |
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168 | |||
169 | sub esi, edi |
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170 | xchg esi, edi |
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171 | jmp socket_internal_receiver |
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172 | |||
173 | |||
1206 | hidnplayr | 174 | .dump: |
175 | DEBUGF 1,"Dumping UDP packet\n" |
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1159 | hidnplayr | 176 | call kernel_free |
177 | add esp, 4 ; pop (balance stack) |
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178 | |||
179 | ret |
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180 | |||
181 | |||
182 | |||
183 | |||
184 | ;----------------------------------------------------------------- |
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185 | ; |
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1249 | hidnplayr | 186 | ; UDP_socket_send |
1159 | hidnplayr | 187 | ; |
1249 | hidnplayr | 188 | ; IN: eax = socket pointer |
189 | ; ecx = number of bytes to send |
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190 | ; esi = pointer to data |
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1159 | hidnplayr | 191 | ; |
192 | ;----------------------------------------------------------------- |
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193 | |||
1249 | hidnplayr | 194 | align 4 |
195 | UDP_socket_send: |
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1159 | hidnplayr | 196 | |
1249 | hidnplayr | 197 | mov edx, dword [eax + SOCKET_head.end + IPv4_SOCKET.end + UDP_SOCKET.LocalPort] ; load local port and remote port at once |
198 | DEBUGF 1,"local port: %x, remote port: %x\n",\ |
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199 | [eax + SOCKET_head.end + IPv4_SOCKET.end + UDP_SOCKET.LocalPort]:4,\ |
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200 | [eax + SOCKET_head.end + IPv4_SOCKET.end + UDP_SOCKET.RemotePort]:4 |
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201 | mov ebx, [eax + SOCKET_head.end + IPv4_SOCKET.LocalIP] |
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202 | mov eax, [eax + SOCKET_head.end + IPv4_SOCKET.RemoteIP] |
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203 | |||
1206 | hidnplayr | 204 | DEBUGF 1,"Create UDP Packet (size=%u)\n",ecx |
1159 | hidnplayr | 205 | |
1249 | hidnplayr | 206 | mov di , IP_PROTO_UDP |
1159 | hidnplayr | 207 | |
1249 | hidnplayr | 208 | sub esp, 8 ; reserve some place in stack for later |
209 | |||
210 | ; Create the pseudoheader in stack, |
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211 | ; (now that we still have all the variables that are needed.) |
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212 | push dword IP_PROTO_UDP shl 8 |
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213 | |||
1159 | hidnplayr | 214 | add ecx, UDP_Packet.Data |
215 | |||
1249 | hidnplayr | 216 | ; TODO: fill in: dx = fragment id |
1159 | hidnplayr | 217 | |
1249 | hidnplayr | 218 | push edx esi |
1196 | hidnplayr | 219 | call IPv4_create_packet ; TODO: figure out a way to choose between IPv4 and IPv6 |
1159 | hidnplayr | 220 | cmp edi, -1 |
1206 | hidnplayr | 221 | je .fail |
1159 | hidnplayr | 222 | |
1251 | clevermous | 223 | mov [esp + 8 + 4], eax ; pointer to buffer start |
224 | mov [esp + 8 + 4 + 4], edx ; buffer size |
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1159 | hidnplayr | 225 | |
1249 | hidnplayr | 226 | rol cx, 8 |
227 | mov [edi + UDP_Packet.Length], cx |
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1251 | clevermous | 228 | mov [esp + 8 + 2], cx |
1249 | hidnplayr | 229 | ror cx, 8 |
230 | |||
1159 | hidnplayr | 231 | pop esi |
1249 | hidnplayr | 232 | push edi ecx |
233 | sub ecx, UDP_Packet.Data |
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1159 | hidnplayr | 234 | add edi, UDP_Packet.Data |
235 | shr ecx, 2 |
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236 | rep movsd |
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1249 | hidnplayr | 237 | mov ecx, [esp] |
1251 | clevermous | 238 | and ecx, 3 |
1159 | hidnplayr | 239 | rep movsb |
1249 | hidnplayr | 240 | pop ecx edi |
1159 | hidnplayr | 241 | |
1249 | hidnplayr | 242 | pop dword [edi + UDP_Packet.SourcePort] ; fill in both portnumbers |
243 | mov [edi + UDP_Packet.Checksum], 0 ; set it to zero, to calculate checksum |
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1159 | hidnplayr | 244 | |
1249 | hidnplayr | 245 | ; Checksum for UDP header + data |
246 | xor edx, edx |
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247 | mov esi, edi |
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248 | call checksum_1 |
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249 | ; Checksum for pseudoheader |
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1251 | clevermous | 250 | pushd [edi-4] ; destination address |
251 | pushd [edi-8] ; source address |
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1249 | hidnplayr | 252 | mov ecx, 12 |
253 | mov esi, esp |
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254 | call checksum_1 |
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255 | add esp, 12 ; remove the pseudoheader from stack |
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256 | ; Now create the final checksum and store it in UDP header |
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257 | call checksum_2 |
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258 | mov [edi + UDP_Packet.Checksum], dx |
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1159 | hidnplayr | 259 | |
1206 | hidnplayr | 260 | inc [UDP_PACKETS_TX] |
261 | |||
1159 | hidnplayr | 262 | DEBUGF 1,"Sending UDP Packet to device %x\n", ebx ; |
1249 | hidnplayr | 263 | jmp ETH_sender ; |
1159 | hidnplayr | 264 | |
1206 | hidnplayr | 265 | .fail: |
266 | ; todo: queue the packet |
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1249 | hidnplayr | 267 | add esp, 8+12+8 |
1206 | hidnplayr | 268 | ret |
1159 | hidnplayr | 269 | |
270 | |||
1206 | hidnplayr | 271 | |
1249 | hidnplayr | 272 | |
1159 | hidnplayr | 273 | ;--------------------------------------------------------------------------- |
274 | ; |
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275 | ; UDP_API |
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276 | ; |
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277 | ; This function is called by system function 75 |
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278 | ; |
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279 | ; IN: subfunction number in bl |
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280 | ; device number in bh |
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281 | ; ecx, edx, .. depends on subfunction |
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282 | ; |
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283 | ; OUT: |
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284 | ; |
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285 | ;--------------------------------------------------------------------------- |
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286 | |||
287 | align 4 |
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288 | UDP_API: |
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289 | |||
290 | movzx eax, bh |
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291 | shl eax, 2 |
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292 | |||
293 | test bl, bl |
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294 | jz .packets_tx ; 0 |
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295 | dec bl |
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296 | jz .packets_rx ; 1 |
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297 | |||
298 | .error: |
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299 | mov eax, -1 |
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300 | ret |
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301 | |||
302 | .packets_tx: |
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303 | add eax, UDP_PACKETS_TX |
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304 | mov eax, [eax] |
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305 | ret |
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306 | |||
307 | .packets_rx: |
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308 | add eax, UDP_PACKETS_RX |
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309 | mov eax, [eax] |
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310 | ret |