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kolibrios/kernel/branches/net/network/IPv6.inc

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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2012. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;; IPv6.INC ;;
;; ;;
;; Part of the tcp/ip network stack for KolibriOS ;;
;; ;;
;; Written by hidnplayr@kolibrios.org ;;
;; ;;
;; GNU GENERAL PUBLIC LICENSE ;;
;; Version 2, June 1991 ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision$
struct IPv6_header
VersionTrafficFlow dd ? ; Version[0-3], Traffic class[4-11], Flow Label [12-31]
PayloadLength dw ? ; 16 bits, unsigned length of payload (extension headers are part of this)
NextHeader db ? ; Values are same as in IPv4 'Protocol' field
HopLimit db ? ; Decremented by every node, packet is discarded when it reaches 0
SourceAddress rd 4 ; 128-bit addresses
DestinationAddress rd 4 ;
ends
;-----------------------------------------------------------------
;
; IPv6_input:
;
; Will check if IPv6 Packet isnt damaged
; and call appropriate handler. (TCP/UDP/ICMP/..)
;
; It will also re-construct fragmented packets
;
; IN: Pointer to buffer in [esp]
; size of buffer in [esp+4]
; pointer to device struct in ebx
; pointer to IPv6 header in edx
; size of IPv6 packet in ecx
; OUT: /
;
;-----------------------------------------------------------------
align 4
IPv6_input:
DEBUGF 1,"IPv6_input\nfrom: %x:%x:%x:%x:%x:%x:%x:%x\n",\
[edx + IPv6_header.SourceAddress + 0]:4,[edx + IPv6_header.SourceAddress + 2]:4,\
[edx + IPv6_header.SourceAddress + 4]:4,[edx + IPv6_header.SourceAddress + 6]:4,\
[edx + IPv6_header.SourceAddress + 8]:4,[edx + IPv6_header.SourceAddress + 10]:4,\
[edx + IPv6_header.SourceAddress + 12]:4,[edx + IPv6_header.SourceAddress + 14]:4
DEBUGF 1,"to: %x:%x:%x:%x:%x:%x:%x:%x\n",\
[edx + IPv6_header.DestinationAddress + 0]:4,[edx + IPv6_header.DestinationAddress + 2]:4,\
[edx + IPv6_header.DestinationAddress + 4]:4,[edx + IPv6_header.DestinationAddress + 6]:4,\
[edx + IPv6_header.DestinationAddress + 8]:4,[edx + IPv6_header.DestinationAddress + 10]:4,\
[edx + IPv6_header.DestinationAddress + 12]:4,[edx + IPv6_header.DestinationAddress + 14]:4
sub ecx, sizeof.IPv6_header
jb .dump
movzx eax, [edx + IPv6.PayloadLength]
xchg al, ah
cmp eax, ecx
jb .dump
;-------------------------------------------------------------------
; No, it's just a regular IP packet, pass it to the higher protocols
.handle_it:
movzx esi, [edx + IPv6_header.VersionAndIHL] ; Calculate Header length by using IHL field
and esi, 0x0000000f ;
shl esi, 2 ;
movzx ecx, [edx + IPv6_header.TotalLength] ; Calculate length of encapsulated Packet
xchg cl, ch ;
sub ecx, esi ;
lea edi, [edx + IPv6_header.SourceAddress] ; make edi ptr to source and dest IPv6 address
mov al, [edx + IPv6_header.Protocol]
add esi, edx ; make esi ptr to data
; cmp al, IP_PROTO_TCP
; je TCP_input
; cmp al, IP_PROTO_UDP
; je UDP_input
; cmp al, IP_PROTO_ICMP
; je ICMP_input
DEBUGF 2,"IPv6_input - unknown protocol: %u\n", al
.dump:
DEBUGF 2,"IPv6_input - dumping\n"
add esp, 4
call KernelFree
ret