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1 | ha | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; UDP.INC ;; |
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4 | ;; ;; |
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5 | ;; UDP Processes for Menuet OS TCP/IP stack ;; |
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6 | ;; ;; |
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7 | ;; Version 0.3 29 August 2002 ;; |
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8 | ;; ;; |
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9 | ;; Copyright 2002 Mike Hibbett, mikeh@oceanfree.net ;; |
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10 | ;; ;; |
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11 | ;; See file COPYING for details ;; |
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12 | ;; ;; |
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13 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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14 | |||
15 | |||
16 | ;******************************************************************* |
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17 | ; Interface |
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18 | ; |
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19 | ; udp_rx Handles received IP packets with the UDP protocol |
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20 | ; |
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21 | ;******************************************************************* |
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261 | hidnplayr | 22 | |
23 | |||
24 | ; |
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25 | ; UDP Payload ( Data field in IP datagram ) |
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26 | ; |
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27 | ; 0 1 2 3 |
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28 | ; 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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29 | ; |
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30 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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31 | ; | Source Port | Destination Port | |
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32 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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33 | ; | Length ( UDP Header + Data ) | Checksum | |
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34 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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35 | ; | UDP Data | |
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36 | ; +-+-+-.......... -+ |
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37 | ; |
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38 | |||
39 | struc UDP_PACKET |
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40 | { .SourcePort dw ? ;+00 |
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41 | .DestinationPort dw ? ;+02 |
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42 | .Length dw ? ;+04 - Length of (UDP Header + Data) |
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43 | .Checksum dw ? ;+06 |
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44 | .Data db ? ;+08 |
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45 | } |
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46 | |||
47 | virtual at 0 |
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48 | UDP_PACKET UDP_PACKET |
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49 | end virtual |
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50 | |||
51 | |||
1 | ha | 52 | ;*************************************************************************** |
53 | ; Function |
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261 | hidnplayr | 54 | ; udp_rx [by Johnny_B] |
1 | ha | 55 | ; |
56 | ; Description |
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57 | ; UDP protocol handler |
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58 | ; This is a kernel function, called by ip_rx |
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59 | ; IP buffer address given in edx |
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261 | hidnplayr | 60 | ; IP buffer number in eax |
1 | ha | 61 | ; Free up (or re-use) IP buffer when finished |
62 | ; |
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63 | ;*************************************************************************** |
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64 | udp_rx: |
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65 | push eax |
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66 | |||
67 | ; First validate the header & checksum. Discard buffer if error |
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68 | |||
69 | ; Look for a socket where |
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70 | ; IP Packet UDP Destination Port = local Port |
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71 | ; IP Packet SA = Remote IP |
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72 | |||
73 | movzx ebx, word [edx + 22] ; get the local port from |
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74 | ; the IP packet's UDP header |
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75 | mov eax, SOCKETBUFFSIZE * NUM_SOCKETS |
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76 | mov ecx, NUM_SOCKETS |
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77 | |||
78 | fs1: |
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79 | sub eax, SOCKETBUFFSIZE |
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80 | cmp [eax + sockets + 12], bx ; bx will hold the 'wrong' value, |
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81 | ; but the comparision is correct |
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82 | loopnz fs1 ; Return back if no match |
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83 | jz fs_done |
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84 | |||
85 | ; No match, so exit |
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86 | jmp udprx_001 |
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87 | |||
88 | fs_done: |
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89 | ; For dhcp, we must allow any remote server to respond. |
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90 | ; I will accept the first incoming response to be the one |
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91 | ; I bind to, if the socket is opened with a destination IP address of |
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92 | ; 255.255.255.255 |
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93 | mov ebx, [eax + sockets + 16] |
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94 | cmp ebx, 0xffffffff |
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95 | je udprx_002 |
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96 | |||
97 | mov ebx, [edx + 12] ; get the Source address from the IP packet |
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98 | cmp [eax + sockets + 16], ebx |
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99 | jne udprx_001 ; Quit if the source IP is not valid |
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100 | |||
101 | udprx_002: |
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102 | ; OK - we have a valid UDP packet for this socket. |
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103 | ; First, update the sockets remote port number with the incoming msg |
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104 | ; - it will have changed |
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105 | ; from the original ( 69 normally ) to allow further connects |
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106 | movzx ebx, word [edx + 20] ; get the UDP source port |
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107 | ; ( was 69, now new ) |
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108 | mov [eax + sockets + 20], bx |
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109 | |||
110 | ; Now, copy data to socket. We have socket address as [eax + sockets]. |
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111 | ; We have IP packet in edx |
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112 | |||
113 | ; get # of bytes in ecx |
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114 | movzx ecx, byte [edx + 3] ; total length of IP packet. Subtract |
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115 | mov ch, byte [edx + 2] ; 20 + 8 gives data length |
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116 | sub ecx, 28 |
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117 | |||
118 | mov ebx, eax |
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119 | add ebx, sockets ; ebx = address of actual socket |
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120 | |||
121 | mov eax, [ebx+ 4] ; get socket owner PID |
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122 | push eax |
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123 | |||
124 | mov eax, [ebx + 24] ; get # of bytes already in buffer |
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125 | add [ebx + 24], ecx ; increment the count of bytes in buffer |
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126 | |||
127 | ; point to the location to store the data |
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128 | add ebx, eax |
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129 | add ebx, SOCKETHEADERSIZE |
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130 | |||
131 | ; ebx = location for first byte, ecx has count, |
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132 | ; edx points to data |
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133 | |||
134 | add edx, 28 ; edx now points to the data |
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135 | mov edi, ebx |
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136 | mov esi, edx |
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137 | |||
138 | cld |
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139 | rep movsb ; copy the data across |
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140 | |||
141 | ; flag an event to the application |
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142 | pop eax |
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143 | mov ecx,1 |
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115 | poddubny | 144 | mov esi,0x3020+TASKDATA.pid |
1 | ha | 145 | |
146 | newsearch: |
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147 | cmp [esi],eax |
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148 | je foundPID |
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149 | inc ecx |
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150 | add esi,0x20 |
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151 | cmp ecx,[0x3004] |
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152 | jbe newsearch |
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153 | |||
154 | foundPID: |
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155 | shl ecx,8 |
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115 | poddubny | 156 | or dword [ecx+0x80000+APPDATA.event_mask],dword 10000000b ; stack event |
1 | ha | 157 | |
158 | mov [check_idle_semaphore],200 |
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159 | |||
160 | udprx_001: |
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161 | pop eax |
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162 | call freeBuff ; Discard the packet |
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163 | ret |