;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;; ;; ;; Copyright (C) KolibriOS team 2004-2024. All rights reserved. ;; ;; Distributed under terms of the GNU General Public License ;; ;; ;; ;; UDP.INC ;; ;; ;; ;; Part of the TCP/IP network stack for KolibriOS ;; ;; ;; ;; Written by hidnplayr@kolibrios.org ;; ;; ;; ;; GNU GENERAL PUBLIC LICENSE ;; ;; Version 2, June 1991 ;; ;; ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; struct UDP_header SourcePort dw ? DestinationPort dw ? Length dw ? ; Length of (UDP Header + Data) Checksum dw ? ends uglobal align 4 UDP_packets_tx rd NET_DEVICES_MAX UDP_packets_rx rd NET_DEVICES_MAX endg ;-----------------------------------------------------------------; ; ; ; udp_init: This function resets all UDP variables ; ; ; ;-----------------------------------------------------------------; macro udp_init { xor eax, eax mov edi, UDP_packets_tx mov ecx, 2*NET_DEVICES_MAX rep stosd } macro udp_checksum IP1, IP2 { ; esi = ptr to udp packet, ecx = packet size, destroys: ecx, edx ; Pseudoheader mov edx, IP_PROTO_UDP add dl, byte[IP1+1] adc dh, byte[IP1+0] adc dl, byte[IP1+3] adc dh, byte[IP1+2] adc dl, byte[IP2+1] adc dh, byte[IP2+0] adc dl, byte[IP2+3] adc dh, byte[IP2+2] adc dl, cl ; byte[esi+UDP_header.Length+1] adc dh, ch ; byte[esi+UDP_header.Length+0] ; Done with pseudoheader, now do real header adc dl, byte[esi+UDP_header.SourcePort+1] adc dh, byte[esi+UDP_header.SourcePort+0] adc dl, byte[esi+UDP_header.DestinationPort+1] adc dh, byte[esi+UDP_header.DestinationPort+0] adc dl, byte[esi+UDP_header.Length+1] adc dh, byte[esi+UDP_header.Length+0] adc edx, 0 ; Done with header, now do data push esi movzx ecx, [esi+UDP_header.Length] rol cx , 8 sub cx , sizeof.UDP_header add esi, sizeof.UDP_header call checksum_1 call checksum_2 pop esi add [esi+UDP_header.Checksum], dx ; this final instruction will set or clear ZF :) } ;-----------------------------------------------------------------; ; ; ; udp_input: Inject the UDP data in the application sockets. ; ; ; ; IN: [esp] = ptr to buffer ; ; ebx = ptr to device struct ; ; ecx = UDP packet size ; ; edx = ptr to IPv4 header ; ; esi = ptr to UDP packet data ; ; edi = interface number*4 ; ; ; ; OUT: / ; ; ; ;-----------------------------------------------------------------; align 4 udp_input: DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: size=%u\n", ecx ; First validate, checksum neg [esi + UDP_header.Checksum] ; substract checksum from 0 jz .no_checksum ; if checksum is zero, it is considered valid ; otherwise, we will re-calculate the checksum and add it to this value, thus creating 0 when it is correct mov eax, edx udp_checksum (eax+IPv4_header.SourceAddress), (eax+IPv4_header.DestinationAddress) jnz .checksum_mismatch .no_checksum: DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: checksum ok\n" ; Convert length to little endian rol [esi + UDP_header.Length], 8 ; Look for a socket where ; IP Packet UDP Destination Port = local Port ; IP Packet SA = Remote IP pusha mov ecx, socket_mutex call mutex_lock popa mov cx, [esi + UDP_header.SourcePort] mov dx, [esi + UDP_header.DestinationPort] mov eax, net_sockets .next_socket: mov eax, [eax + SOCKET.NextPtr] or eax, eax jz .unlock_dump cmp [eax + SOCKET.Domain], AF_INET4 jne .next_socket cmp [eax + SOCKET.Protocol], IP_PROTO_UDP jne .next_socket cmp [eax + UDP_SOCKET.LocalPort], dx jne .next_socket DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: socket=%x\n", eax pusha mov ecx, socket_mutex call mutex_unlock popa ;;; TODO: when packet is processed, check more sockets?! ; FIXME: check remote IP if possible ; ; cmp [eax + IP_SOCKET.RemoteIP], 0xffffffff ; je @f ; cmp [eax + IP_SOCKET.RemoteIP], ; jne .next_socket ; @@: cmp [eax + UDP_SOCKET.RemotePort], 0 je .updateport cmp [eax + UDP_SOCKET.RemotePort], cx jne .dump pusha lea ecx, [eax + SOCKET.mutex] call mutex_lock popa .updatesock: inc [UDP_packets_rx + edi] movzx ecx, [esi + UDP_header.Length] sub ecx, sizeof.UDP_header add esi, sizeof.UDP_header jmp socket_input .updateport: pusha lea ecx, [eax + SOCKET.mutex] call mutex_lock popa DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: new remote port=%x\n", cx ; FIXME: find a way to print big endian values with debugf mov [eax + UDP_SOCKET.RemotePort], cx jmp .updatesock .unlock_dump: pusha mov ecx, socket_mutex call mutex_unlock popa DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: no socket found\n" jmp .dump .checksum_mismatch: DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: checksum mismatch\n" .dump: DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_input: dumping\n" call net_buff_free ret ;-----------------------------------------------------------------; ; ; ; udp_output: Create an UDP packet. ; ; ; ; IN: eax = socket pointer ; ; ecx = number of bytes to send ; ; esi = pointer to data ; ; ; ; OUT: eax = -1 on error ; ; ; ;-----------------------------------------------------------------; align 4 udp_output: DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_output: socket=%x bytes=%u data_ptr=%x\n", eax, ecx, esi mov dx, [eax + UDP_SOCKET.RemotePort] DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_output: remote port=%x, ", dx ; FIXME: find a way to print big endian values with debugf rol edx, 16 mov dx, [eax + UDP_SOCKET.LocalPort] DEBUGF DEBUG_NETWORK_VERBOSE, "local port=%x\n", dx sub esp, 4 ; Data ptr will be placed here push edx esi mov ebx, [eax + IP_SOCKET.device] mov edx, [eax + IP_SOCKET.LocalIP] mov edi, [eax + IP_SOCKET.RemoteIP] mov al, [eax + IP_SOCKET.ttl] mov ah, IP_PROTO_UDP add ecx, sizeof.UDP_header call ipv4_output jz .fail mov [esp + 8], eax ; pointer to buffer start mov [edi + UDP_header.Length], cx rol [edi + UDP_header.Length], 8 pop esi push edi ecx sub ecx, sizeof.UDP_header add edi, sizeof.UDP_header shr ecx, 2 rep movsd mov ecx, [esp] and ecx, 3 rep movsb pop ecx edi pop dword [edi + UDP_header.SourcePort] ; Checksum mov esi, edi mov [edi + UDP_header.Checksum], 0 udp_checksum (edi-4), (edi-8) ; FIXME: IPv4 packet could have options.. DEBUGF DEBUG_NETWORK_VERBOSE, "UDP_output: sending with device %x\n", ebx call [ebx + NET_DEVICE.transmit] test eax, eax jnz @f call net_ptr_to_num4 inc [UDP_packets_tx + edi] @@: ret .fail: DEBUGF DEBUG_NETWORK_ERROR, "UDP_output: failed\n" add esp, 4+4+8 or eax, -1 ret ;-----------------------------------------------------------------; ; ; ; udp_connect ; ; ; ; IN: eax = socket pointer ; ; edx = pointer to sockaddr struct ; ; ; ; OUT: eax = 0 on success ; ; eax = -1 on error ; ; ebx = error code on error ; ; ; ;-----------------------------------------------------------------; align 4 udp_connect: test [eax + SOCKET.state], SS_ISCONNECTED jz @f call udp_disconnect @@: push eax edx lea ecx, [eax + SOCKET.mutex] call mutex_lock pop edx eax ; Fill in remote port and IP pushw [edx + sockaddr.port] popw [eax + UDP_SOCKET.RemotePort] pushd [edx + sockaddr.ip] pop [eax + UDP_SOCKET.RemoteIP] ; Find route to host pusha push eax mov ebx, [eax + UDP_SOCKET.device] mov edx, [eax + UDP_SOCKET.LocalIP] mov eax, [eax + UDP_SOCKET.RemoteIP] call ipv4_route test eax, eax jz .enoroute pop eax mov ebx, [net_device_list + edi] mov [eax + UDP_SOCKET.device], ebx mov [eax + UDP_SOCKET.LocalIP], edx popa ; Find a local port, if user didnt define one cmp [eax + UDP_SOCKET.LocalPort], 0 jne @f call socket_find_port @@: push eax lea ecx, [eax + SOCKET.mutex] call mutex_unlock pop eax call socket_is_connected xor eax, eax ret .enoroute: pop eax push eax lea ecx, [eax + SOCKET.mutex] call mutex_unlock pop eax popa xor eax, eax dec eax mov ebx, EADDRNOTAVAIL ret ;-----------------------------------------------------------------; ; ; ; UDP_disconnect ; ; ; ; IN: eax = socket pointer ; ; ; ; OUT: eax = socket pointer ; ; ; ;-----------------------------------------------------------------; align 4 udp_disconnect: ; TODO: remove the pending received data call socket_is_disconnected ret ;-----------------------------------------------------------------; ; ; ; UDP_api: Part of system function 76 ; ; ; ; IN: bl = subfunction number in bl ; ; bh = device number in bh ; ; ecx, edx, .. depends on subfunction ; ; ; ; OUT: depends on subfunction ; ; ; ;-----------------------------------------------------------------; align 4 udp_api: movzx eax, bh shl eax, 2 test bl, bl jz .packets_tx ; 0 dec bl jz .packets_rx ; 1 .error: mov eax, -1 ret .packets_tx: mov eax, [UDP_packets_tx + eax] ret .packets_rx: mov eax, [UDP_packets_rx + eax] ret