334 lines
7.5 KiB
PHP
334 lines
7.5 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2010. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;; UDP.INC ;;
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;; ;;
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;; Part of the tcp/ip network stack for KolibriOS ;;
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;; ;;
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;; Written by hidnplayr@kolibrios.org ;;
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;; ;;
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;; GNU GENERAL PUBLIC LICENSE ;;
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;; Version 2, June 1991 ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision$
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struct UDP_Packet
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.SourcePort dw ?
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.DestinationPort dw ?
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.Length dw ? ; Length of (UDP Header + Data)
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.Checksum dw ?
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.Data:
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ends
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align 4
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uglobal
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UDP_PACKETS_TX rd MAX_IP
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UDP_PACKETS_RX rd MAX_IP
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endg
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;-----------------------------------------------------------------
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;
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; UDP_init
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;
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; This function resets all UDP variables
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;
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;-----------------------------------------------------------------
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macro UDP_init {
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xor eax, eax
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mov edi, UDP_PACKETS_TX
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mov ecx, 2*MAX_IP
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rep stosd
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}
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macro UDP_checksum IP1, IP2 { ; esi = ptr to udp packet, ecx = packet size, destroys: ecx, edx
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; Pseudoheader
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mov edx, IP_PROTO_UDP
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add dl, [IP1+1]
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adc dh, [IP1+0]
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adc dl, [IP1+3]
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adc dh, [IP1+2]
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adc dl, [IP2+1]
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adc dh, [IP2+0]
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adc dl, [IP2+3]
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adc dh, [IP2+2]
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adc dl, cl ; byte[esi+UDP_Packet.Length+1]
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adc dh, ch ; byte[esi+UDP_Packet.Length+0]
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; Done with pseudoheader, now do real header
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adc dl, byte[esi+UDP_Packet.SourcePort+1]
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adc dh, byte[esi+UDP_Packet.SourcePort+0]
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adc dl, byte[esi+UDP_Packet.DestinationPort+1]
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adc dh, byte[esi+UDP_Packet.DestinationPort+0]
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adc dl, byte[esi+UDP_Packet.Length+1]
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adc dh, byte[esi+UDP_Packet.Length+0]
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adc edx, 0
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; Done with header, now do data
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push esi
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movzx ecx, [esi+UDP_Packet.Length]
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rol cx , 8
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sub cx , UDP_Packet.Data
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add esi, UDP_Packet.Data
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call checksum_1
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call checksum_2
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pop esi
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add [esi+UDP_Packet.Checksum], dx ; this final instruction will set or clear ZF :)
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}
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;-----------------------------------------------------------------
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;
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; UDP_input:
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;
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; Called by IPv4_input,
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; this procedure will inject the udp data diagrams in the application sockets.
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;
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; IN: [esp] = Pointer to buffer
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; [esp+4] = size of buffer
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; ebx = ptr to device struct
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; ecx = UDP Packet size
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; edx = ptr to UDP header
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;
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; esi = ipv4 source address
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; edi = ipv4 dest address
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;
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; OUT: /
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;
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;-----------------------------------------------------------------
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align 4
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UDP_input:
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DEBUGF 1,"UDP_input, size:%u\n", ecx
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; First validate, checksum:
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neg [edx+UDP_Packet.Checksum] ; substract chechksum from 0
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jz .no_checksum ; if checksum is zero, it is considered valid and we continue processing
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; otherwise, we will re-calculate the checksum and add it to this value, thus creating 0 when it is correct
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push edx
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push edi
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push esi
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mov esi, edx
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UDP_checksum (esp), (esp+4)
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pop edi
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pop esi ; we dont need it, but it is smaller then add esp, 4
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pop edx
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jnz .checksum_mismatch
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.no_checksum:
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DEBUGF 1,"UDP Checksum is correct\n"
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; Look for a socket where
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; IP Packet UDP Destination Port = local Port
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; IP Packet SA = Remote IP
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mov eax, net_sockets
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.try_more:
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mov si , [edx + UDP_Packet.DestinationPort] ; get the local port from the IP Packet's UDP header
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rol si , 8
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.next_socket:
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mov eax, [eax + SOCKET.NextPtr]
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or eax, eax
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jz .dump
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cmp [eax + SOCKET.Domain], AF_INET4
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jne .next_socket
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cmp [eax + SOCKET.Protocol], IP_PROTO_UDP
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jne .next_socket
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cmp [eax + UDP_SOCKET.LocalPort], si
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jne .next_socket
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DEBUGF 1,"using socket: %x\n", eax
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;;; TODO: when packet is processed, check more sockets!
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cmp [eax + IP_SOCKET.RemoteIP], 0xffffffff
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je @f
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cmp [eax + IP_SOCKET.RemoteIP], edi ; edi is the packets source address
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jne .try_more
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@@:
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cmp [eax + UDP_SOCKET.firstpacket], 0
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jz .updateport
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mov si, [edx + UDP_Packet.SourcePort]
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rol si, 8
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cmp [eax + UDP_SOCKET.RemotePort], si
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jne .dump
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push ebx
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lea ebx, [eax + SOCKET.lock]
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call wait_mutex
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pop ebx
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.updatesock:
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inc [UDP_PACKETS_RX]
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DEBUGF 1,"Found valid UDP packet for socket %x\n", eax
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lea esi, [edx + UDP_Packet.Data]
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movzx ecx, [edx + UDP_Packet.Length]
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rol cx , 8
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sub cx , UDP_Packet.Data
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jmp SOCKET_input
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.updateport:
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push ebx
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lea ebx, [eax + SOCKET.lock]
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call wait_mutex
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pop ebx
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mov si, [edx + UDP_Packet.SourcePort]
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rol si, 8
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DEBUGF 1,"Changing remote port to: %u\n", si
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mov [eax + UDP_SOCKET.RemotePort], si
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inc [eax + UDP_SOCKET.firstpacket]
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jmp .updatesock
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.checksum_mismatch:
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DEBUGF 2,"UDP_Handler - checksum mismatch\n"
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.dump:
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call kernel_free
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add esp, 4 ; pop (balance stack)
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DEBUGF 2,"UDP_Handler - dumping\n"
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ret
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;-----------------------------------------------------------------
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;
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; UDP_output
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;
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; IN: eax = socket pointer
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; ecx = number of bytes to send
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; esi = pointer to data
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;
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;-----------------------------------------------------------------
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align 4
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UDP_output:
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DEBUGF 1,"UDP_output: socket:%x, bytes: %u, data ptr: %x\n", eax, ecx, esi
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mov dx, [eax + UDP_SOCKET.RemotePort]
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DEBUGF 1,"remote port: %u\n", dx
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rol dx, 8
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rol edx, 16
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mov dx, [eax + UDP_SOCKET.LocalPort]
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DEBUGF 1,"local port: %u\n", dx
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rol dx, 8
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mov ebx, [eax + IP_SOCKET.LocalIP]
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mov eax, [eax + IP_SOCKET.RemoteIP]
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mov di, IP_PROTO_UDP shl 8 + 128
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sub esp, 8 ; Data ptr and data size will be placed here
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add ecx, UDP_Packet.Data
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;;; TODO: fragment id
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push edx esi
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call IPv4_output
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jz .fail
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mov [esp + 8], eax ; pointer to buffer start
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mov [esp + 8 + 4], edx ; buffer size
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mov [edi + UDP_Packet.Length], cx
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rol [edi + UDP_Packet.Length], 8
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pop esi
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push edi ecx
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sub ecx, UDP_Packet.Data
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add edi, UDP_Packet.Data
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shr ecx, 2
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rep movsd
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mov ecx, [esp]
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and ecx, 3
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rep movsb
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pop ecx edi
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pop dword [edi + UDP_Packet.SourcePort]
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; Checksum
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mov esi, edi
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mov [edi + UDP_Packet.Checksum], 0
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UDP_checksum (edi-4), (edi-8) ; TODO: fix this, IPv4 packet could have options..
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inc [UDP_PACKETS_TX]
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DEBUGF 1,"Sending UDP Packet to device %x\n", ebx
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call [ebx + NET_DEVICE.transmit]
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ret
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.fail:
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DEBUGF 1,"UDP_output: failed\n"
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add esp, 4+4+8
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xor eax, eax
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ret
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;---------------------------------------------------------------------------
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;
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; UDP_API
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;
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; This function is called by system function 75
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;
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; IN: subfunction number in bl
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; device number in bh
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; ecx, edx, .. depends on subfunction
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;
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; OUT:
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;
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;---------------------------------------------------------------------------
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align 4
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UDP_API:
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movzx eax, bh
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shl eax, 2
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test bl, bl
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jz .packets_tx ; 0
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dec bl
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jz .packets_rx ; 1
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.error:
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mov eax, -1
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ret
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.packets_tx:
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add eax, UDP_PACKETS_TX
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mov eax, [eax]
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ret
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.packets_rx:
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add eax, UDP_PACKETS_RX
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mov eax, [eax]
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ret
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