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431 | serge | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; Copyright (C) KolibriOS team 2004-2007. All rights reserved. ;; |
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4 | ;; Distributed under terms of the GNU General Public License ;; |
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5 | ;; ;; |
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6 | ;; ;; |
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7 | ;; Copyright (C) KolibriOS team 2004-2007. All rights reserved. ;; |
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8 | ;; Distributed under terms of the GNU General Public License ;; |
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9 | ;; ;; |
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10 | ;; ;; |
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11 | ;; UDP.INC ;; |
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12 | ;; ;; |
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13 | ;; UDP Processes for Menuet OS TCP/IP stack ;; |
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14 | ;; ;; |
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15 | ;; Version 0.3 29 August 2002 ;; |
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16 | ;; ;; |
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17 | ;; Copyright 2002 Mike Hibbett, mikeh@oceanfree.net ;; |
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18 | ;; ;; |
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19 | ;; See file COPYING for details ;; |
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20 | ;; ;; |
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21 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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379 | serge | 22 | |
593 | mikedld | 23 | $Revision: 914 $ |
379 | serge | 24 | |
593 | mikedld | 25 | |
1 | ha | 26 | ;******************************************************************* |
27 | ; Interface |
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28 | ; |
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29 | ; udp_rx Handles received IP packets with the UDP protocol |
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379 | serge | 30 | ; |
1 | ha | 31 | ;******************************************************************* |
261 | hidnplayr | 32 | |
33 | |||
34 | ; |
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35 | ; UDP Payload ( Data field in IP datagram ) |
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36 | ; |
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37 | ; 0 1 2 3 |
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38 | ; 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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39 | ; |
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40 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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41 | ; | Source Port | Destination Port | |
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42 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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43 | ; | Length ( UDP Header + Data ) | Checksum | |
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44 | ; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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45 | ; | UDP Data | |
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46 | ; +-+-+-.......... -+ |
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47 | ; |
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48 | |||
49 | struc UDP_PACKET |
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50 | { .SourcePort dw ? ;+00 |
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51 | .DestinationPort dw ? ;+02 |
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52 | .Length dw ? ;+04 - Length of (UDP Header + Data) |
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53 | .Checksum dw ? ;+06 |
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54 | .Data db ? ;+08 |
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55 | } |
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56 | |||
57 | virtual at 0 |
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58 | UDP_PACKET UDP_PACKET |
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59 | end virtual |
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60 | |||
61 | |||
1 | ha | 62 | ;*************************************************************************** |
63 | ; Function |
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261 | hidnplayr | 64 | ; udp_rx [by Johnny_B] |
1 | ha | 65 | ; |
66 | ; Description |
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67 | ; UDP protocol handler |
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68 | ; This is a kernel function, called by ip_rx |
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69 | ; IP buffer address given in edx |
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261 | hidnplayr | 70 | ; IP buffer number in eax |
1 | ha | 71 | ; Free up (or re-use) IP buffer when finished |
72 | ; |
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73 | ;*************************************************************************** |
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914 | serge | 74 | |
75 | proc udp_rx stdcall |
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1 | ha | 76 | push eax |
379 | serge | 77 | |
1 | ha | 78 | ; First validate the header & checksum. Discard buffer if error |
379 | serge | 79 | |
1 | ha | 80 | ; Look for a socket where |
81 | ; IP Packet UDP Destination Port = local Port |
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82 | ; IP Packet SA = Remote IP |
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379 | serge | 83 | |
914 | serge | 84 | mov ax, [edx + 20 + UDP_PACKET.DestinationPort] ; get the local port from |
1 | ha | 85 | ; the IP packet's UDP header |
379 | serge | 86 | |
914 | serge | 87 | mov ebx, net_sockets |
88 | |||
89 | .next_socket: |
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90 | mov ebx, [ebx + SOCKET.NextPtr] |
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91 | or ebx, ebx |
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92 | jz .exit ; No match, so exit |
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93 | cmp [ebx + SOCKET.LocalPort], ax ; ax will hold the 'wrong' value, |
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1 | ha | 94 | ; but the comparision is correct |
914 | serge | 95 | jne .next_socket ; Return back if no match |
379 | serge | 96 | |
1 | ha | 97 | ; For dhcp, we must allow any remote server to respond. |
98 | ; I will accept the first incoming response to be the one |
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99 | ; I bind to, if the socket is opened with a destination IP address of |
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100 | ; 255.255.255.255 |
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914 | serge | 101 | cmp [ebx + SOCKET.RemoteIP], 0xffffffff |
102 | je @f |
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379 | serge | 103 | |
914 | serge | 104 | mov eax, [edx + IP_PACKET.SourceAddress] ; get the Source address from the IP packet |
105 | cmp [ebx + SOCKET.RemoteIP], ebx |
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106 | jne .exit ; Quit if the source IP is not valid |
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1 | ha | 107 | |
914 | serge | 108 | @@: ; OK - we have a valid UDP packet for this socket. |
1 | ha | 109 | ; First, update the sockets remote port number with the incoming msg |
110 | ; - it will have changed |
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111 | ; from the original ( 69 normally ) to allow further connects |
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914 | serge | 112 | mov ax, [edx + 20 + UDP_PACKET.SourcePort] ; get the UDP source port |
1 | ha | 113 | ; ( was 69, now new ) |
914 | serge | 114 | mov [ebx + SOCKET.RemotePort], ax |
379 | serge | 115 | |
1 | ha | 116 | ; Now, copy data to socket. We have socket address as [eax + sockets]. |
117 | ; We have IP packet in edx |
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379 | serge | 118 | |
1 | ha | 119 | ; get # of bytes in ecx |
914 | serge | 120 | movzx ecx, [edx + IP_PACKET.TotalLength] ; total length of IP packet. Subtract |
121 | xchg cl, ch ; 20 + 8 gives data length |
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1 | ha | 122 | sub ecx, 28 |
379 | serge | 123 | |
914 | serge | 124 | mov eax, [ebx + SOCKET.rxDataCount] ; get # of bytes already in buffer |
125 | add [ebx + SOCKET.rxDataCount], ecx ; increment the count of bytes in buffer |
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379 | serge | 126 | |
914 | serge | 127 | ; ecx has count, edx points to data |
379 | serge | 128 | |
1 | ha | 129 | add edx, 28 ; edx now points to the data |
914 | serge | 130 | lea edi, [ebx + eax + SOCKETHEADERSIZE] |
1 | ha | 131 | mov esi, edx |
379 | serge | 132 | |
1 | ha | 133 | cld |
134 | rep movsb ; copy the data across |
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379 | serge | 135 | |
1 | ha | 136 | ; flag an event to the application |
914 | serge | 137 | mov eax, [ebx + SOCKET.PID] ; get socket owner PID |
138 | mov ecx, 1 |
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139 | mov esi, TASK_DATA + TASKDATA.pid |
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379 | serge | 140 | |
914 | serge | 141 | .next_pid: |
142 | cmp [esi], eax |
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143 | je .found_pid |
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1 | ha | 144 | inc ecx |
914 | serge | 145 | add esi, 0x20 |
146 | cmp ecx, [TASK_COUNT] |
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147 | jbe .next_pid |
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379 | serge | 148 | |
914 | serge | 149 | jmp .exit |
1 | ha | 150 | |
914 | serge | 151 | .found_pid: |
152 | shl ecx, 8 |
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153 | or [ecx + SLOT_BASE + APPDATA.event_mask], EVENT_NETWORK ; stack event |
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1 | ha | 154 | |
914 | serge | 155 | mov [check_idle_semaphore], 200 |
156 | |||
157 | .exit: |
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1 | ha | 158 | pop eax |
159 | call freeBuff ; Discard the packet |
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379 | serge | 160 | ret |
914 | serge | 161 | endp |