199 lines
6.9 KiB
PHP
199 lines
6.9 KiB
PHP
$Revision$
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; IP.INC ;;
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;; ;;
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;; IP Processes for Menuet OS TCP/IP stack ;;
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;; ;;
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;; Version 0.3 29 August 2002 ;;
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;; ;;
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;; Copyright 2002 Mike Hibbett, mikeh@oceanfree.net ;;
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;; ;;
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;; See file COPYING for details ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; IP underlying protocols numbers
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PROTOCOL_ICMP equ 1
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PROTOCOL_TCP equ 6
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PROTOCOL_UDP equ 17
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struc IP_PACKET
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{ .VersionAndIHL db ? ;+00 - Version[0-3 bits] and IHL(header length)[4-7 bits]
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.TypeOfService db ? ;+01
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.TotalLength dw ? ;+02
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.Identification dw ? ;+04
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.FlagsAndFragmentOffset dw ? ;+06 - Flags[0-2] and FragmentOffset[3-15]
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.TimeToLive db ? ;+08
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.Protocol db ? ;+09
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.HeaderChecksum dw ? ;+10
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.SourceAddress dd ? ;+12
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.DestinationAddress dd ? ;+16
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.DataOrOptional dd ? ;+20
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}
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virtual at 0
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IP_PACKET IP_PACKET
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end virtual
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;*******************************************************************
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; Interface
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;
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; ip_rx processes all packets received by the network layer
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; It calls the appropriate protocol handler
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;
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;
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;
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;*******************************************************************
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;
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; IP Packet after reception - Normal IP packet format
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;
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; 0 1 2 3
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; 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
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;
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; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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;0 |Version| IHL |Type of Service| Total Length |
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; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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;4 | Identification |Flags| Fragment Offset |
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; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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;8 | Time to Live | Protocol | Header Checksum |
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; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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;12 | Source Address |
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; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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;16 | Destination Address |
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; +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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;20 | Data |
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; +-+-+-.......... -+
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;
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;
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; [smb] attention! according to RFC 791 IP packet may have 'options' sections,
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; so we can't simply think, that data have offset 20. We must calculate offset from
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; IHL field
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;
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macro GET_IHL reg, header_addr
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{
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movzx reg, byte [header_addr]
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; we need 4-7 bits, so....
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and reg, 0x0000000F
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; IHL keeps number of octets, so we need to << 2 'reg'
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shl reg, 2
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}
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;***************************************************************************
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; Function
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; ip_rx
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;
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; Description
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; This is a kernel function, called by stack_handler
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; Processes all IP-packets received by the network layer
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; It calls the appropriate protocol handler
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;
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;***************************************************************************
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proc ip_rx stdcall
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local buffer_number dd ?
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; Look for a buffer to tx
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mov eax, IPIN_QUEUE
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call dequeue
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cmp ax, NO_BUFFER
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je .exit ; Exit if no buffer available
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mov [buffer_number], eax ;save buffer number
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; convert buffer pointer eax to the absolute address
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imul eax, IPBUFFSIZE
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add eax, IPbuffs
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mov ebx, eax ; ebx=pointer to IP_PACKET
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; Validate the IP checksum
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mov dx, word[ebx + IP_PACKET.HeaderChecksum]
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xchg dh,dl ; Get the checksum in intel format
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mov [ebx + IP_PACKET.HeaderChecksum], word 0 ; clear checksum field - need to when
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; recalculating checksum
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; this needs two data pointers and two size #.
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; 2nd pointer can be of length 0
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GET_IHL ecx, ebx + IP_PACKET.VersionAndIHL ;get packet length in ecx
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stdcall checksum_jb, ebx, ecx ;buf_ptr, buf_size
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cmp dx, ax
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mov edx, ebx ; EDX (IP-BUFFER POINTER) WILL BE USED FOR *_rx HANDLERS BELOW!!!
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jnz .dump ;if CHECKSUM isn't valid then dump packet
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; Validate the IP address, if it isn't broadcast
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mov eax, [stack_ip]
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cmp dword[ebx + IP_PACKET.DestinationAddress], eax
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je @f
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; If the IP address is 255.255.255.255, accept it
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; - it is a broadcast packet, which we need for dhcp
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cmp dword[ebx + IP_PACKET.DestinationAddress], 0xffffffff
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jne .dump
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@@:
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mov al, [ebx + IP_PACKET.VersionAndIHL]
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and al, 0x0f ;get IHL(header length)
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cmp al, 0x05 ;if IHL!= 5*4(20 bytes)
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jnz .dump ;then dump it
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cmp byte[ebx + IP_PACKET.TimeToLive], byte 0
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je .dump ;if TTL==0 then dump it
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mov ax, word[ebx + IP_PACKET.FlagsAndFragmentOffset]
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and ax, 0xFFBF ;get flags
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cmp ax, 0 ;if some flags was set then we dump this packet
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jnz .dump ;the flags should be used for fragmented packets
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; Check the protocol, and call the appropriate handler
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; Each handler will re-use or free the queue buffer as appropriate
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mov al, [ebx + IP_PACKET.Protocol]
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cmp al , PROTOCOL_TCP
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jne .not_tcp
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DEBUGF 1,"K : ip_rx - TCP packet\n"
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mov eax, dword[buffer_number]
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call tcp_rx
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jmp .exit
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.not_tcp:
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cmp al, PROTOCOL_UDP
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jne .not_udp
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DEBUGF 1,"K : ip_rx - UDP packet\n"
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mov eax, dword[buffer_number]
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call udp_rx
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jmp .exit
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.not_udp:
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cmp al , PROTOCOL_ICMP
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jne .dump ;protocol ain't supported
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DEBUGF 1,"K : ip_rx - ICMP packet\n"
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;GET_IHL ecx, ebx + IP_PACKET.VersionAndIHL ;get packet length in ecx
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mov eax, dword[buffer_number]
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stdcall icmp_rx,eax,ebx,ecx ;buffer_number,IPPacketBase,IPHeaderLength
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jmp .exit
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.dump:
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; No protocol handler available, so
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; silently dump the packet, freeing up the queue buffer
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inc dword [dumped_rx_count]
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mov eax, dword[buffer_number]
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call freeBuff
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.exit:
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ret
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endp
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