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425 | victor | 1 | $Revision: 425 $ |
1 | ha | 2 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
3 | ;; ;; |
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4 | ;; UDP.INC ;; |
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5 | ;; ;; |
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6 | ;; UDP Processes for Menuet OS TCP/IP stack ;; |
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7 | ;; ;; |
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8 | ;; Version 0.3 29 August 2002 ;; |
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9 | ;; ;; |
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10 | ;; Copyright 2002 Mike Hibbett, mikeh@oceanfree.net ;; |
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11 | ;; ;; |
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12 | ;; See file COPYING for details ;; |
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13 | ;; ;; |
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14 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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379 | serge | 15 | |
16 | |||
1 | ha | 17 | ;******************************************************************* |
18 | ; Interface |
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19 | ; |
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20 | ; udp_rx Handles received IP packets with the UDP protocol |
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379 | serge | 21 | ; |
1 | ha | 22 | ;******************************************************************* |
261 | hidnplayr | 23 | |
24 | |||
25 | ; |
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26 | ; UDP Payload ( Data field in IP datagram ) |
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27 | ; |
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28 | ; 0 1 2 3 |
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29 | ; 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
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30 | ; |
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31 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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32 | ; | Source Port | Destination Port | |
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33 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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34 | ; | Length ( UDP Header + Data ) | Checksum | |
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35 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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36 | ; | UDP Data | |
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37 | ; +-+-+-.......... -+ |
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38 | ; |
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39 | |||
40 | struc UDP_PACKET |
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41 | { .SourcePort dw ? ;+00 |
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42 | .DestinationPort dw ? ;+02 |
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43 | .Length dw ? ;+04 - Length of (UDP Header + Data) |
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44 | .Checksum dw ? ;+06 |
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45 | .Data db ? ;+08 |
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46 | } |
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47 | |||
48 | virtual at 0 |
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49 | UDP_PACKET UDP_PACKET |
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50 | end virtual |
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51 | |||
52 | |||
1 | ha | 53 | ;*************************************************************************** |
54 | ; Function |
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261 | hidnplayr | 55 | ; udp_rx [by Johnny_B] |
1 | ha | 56 | ; |
57 | ; Description |
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58 | ; UDP protocol handler |
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59 | ; This is a kernel function, called by ip_rx |
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60 | ; IP buffer address given in edx |
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261 | hidnplayr | 61 | ; IP buffer number in eax |
1 | ha | 62 | ; Free up (or re-use) IP buffer when finished |
63 | ; |
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64 | ;*************************************************************************** |
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65 | udp_rx: |
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66 | push eax |
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379 | serge | 67 | |
1 | ha | 68 | ; First validate the header & checksum. Discard buffer if error |
379 | serge | 69 | |
1 | ha | 70 | ; Look for a socket where |
71 | ; IP Packet UDP Destination Port = local Port |
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72 | ; IP Packet SA = Remote IP |
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379 | serge | 73 | |
1 | ha | 74 | movzx ebx, word [edx + 22] ; get the local port from |
75 | ; the IP packet's UDP header |
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76 | mov eax, SOCKETBUFFSIZE * NUM_SOCKETS |
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77 | mov ecx, NUM_SOCKETS |
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379 | serge | 78 | |
1 | ha | 79 | fs1: |
80 | sub eax, SOCKETBUFFSIZE |
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81 | cmp [eax + sockets + 12], bx ; bx will hold the 'wrong' value, |
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82 | ; but the comparision is correct |
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83 | loopnz fs1 ; Return back if no match |
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84 | jz fs_done |
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379 | serge | 85 | |
1 | ha | 86 | ; No match, so exit |
87 | jmp udprx_001 |
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379 | serge | 88 | |
1 | ha | 89 | fs_done: |
90 | ; For dhcp, we must allow any remote server to respond. |
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91 | ; I will accept the first incoming response to be the one |
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92 | ; I bind to, if the socket is opened with a destination IP address of |
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93 | ; 255.255.255.255 |
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94 | mov ebx, [eax + sockets + 16] |
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95 | cmp ebx, 0xffffffff |
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379 | serge | 96 | je udprx_002 |
97 | |||
1 | ha | 98 | mov ebx, [edx + 12] ; get the Source address from the IP packet |
99 | cmp [eax + sockets + 16], ebx |
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100 | jne udprx_001 ; Quit if the source IP is not valid |
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101 | |||
379 | serge | 102 | udprx_002: |
1 | ha | 103 | ; OK - we have a valid UDP packet for this socket. |
104 | ; First, update the sockets remote port number with the incoming msg |
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105 | ; - it will have changed |
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106 | ; from the original ( 69 normally ) to allow further connects |
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107 | movzx ebx, word [edx + 20] ; get the UDP source port |
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108 | ; ( was 69, now new ) |
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109 | mov [eax + sockets + 20], bx |
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379 | serge | 110 | |
1 | ha | 111 | ; Now, copy data to socket. We have socket address as [eax + sockets]. |
112 | ; We have IP packet in edx |
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379 | serge | 113 | |
1 | ha | 114 | ; get # of bytes in ecx |
115 | movzx ecx, byte [edx + 3] ; total length of IP packet. Subtract |
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116 | mov ch, byte [edx + 2] ; 20 + 8 gives data length |
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117 | sub ecx, 28 |
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379 | serge | 118 | |
1 | ha | 119 | mov ebx, eax |
120 | add ebx, sockets ; ebx = address of actual socket |
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379 | serge | 121 | |
1 | ha | 122 | mov eax, [ebx+ 4] ; get socket owner PID |
123 | push eax |
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379 | serge | 124 | |
1 | ha | 125 | mov eax, [ebx + 24] ; get # of bytes already in buffer |
126 | add [ebx + 24], ecx ; increment the count of bytes in buffer |
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379 | serge | 127 | |
1 | ha | 128 | ; point to the location to store the data |
129 | add ebx, eax |
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379 | serge | 130 | add ebx, SOCKETHEADERSIZE |
1 | ha | 131 | |
132 | ; ebx = location for first byte, ecx has count, |
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133 | ; edx points to data |
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379 | serge | 134 | |
1 | ha | 135 | add edx, 28 ; edx now points to the data |
136 | mov edi, ebx |
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137 | mov esi, edx |
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379 | serge | 138 | |
1 | ha | 139 | cld |
140 | rep movsb ; copy the data across |
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379 | serge | 141 | |
1 | ha | 142 | ; flag an event to the application |
143 | pop eax |
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144 | mov ecx,1 |
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379 | serge | 145 | mov esi,TASK_DATA+TASKDATA.pid |
146 | |||
1 | ha | 147 | newsearch: |
148 | cmp [esi],eax |
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149 | je foundPID |
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150 | inc ecx |
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151 | add esi,0x20 |
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379 | serge | 152 | cmp ecx,[TASK_COUNT] |
1 | ha | 153 | jbe newsearch |
379 | serge | 154 | |
155 | foundPID: |
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1 | ha | 156 | shl ecx,8 |
380 | serge | 157 | or dword [ecx+SLOT_BASE+APPDATA.event_mask],dword 10000000b ; stack event |
1 | ha | 158 | |
379 | serge | 159 | mov [check_idle_semaphore],200 |
1 | ha | 160 | |
161 | udprx_001: |
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162 | pop eax |
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163 | call freeBuff ; Discard the packet |
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379 | serge | 164 | ret |