forked from KolibriOS/kolibrios
Updates in net branch coded 6 months ago.
Mostly concerning checksuming, and cleanups git-svn-id: svn://kolibrios.org@1473 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
hidnplayr
@@ -19,18 +19,21 @@
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$Revision$
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__DEBUG_LEVEL_OLD__ equ __DEBUG_LEVEL__
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__DEBUG_LEVEL__ equ 1 ; this sets the debug level for network part of kernel
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uglobal
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last_1sTick db ?
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last_1hsTick dd ?
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endg
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MAX_NET_DEVICES equ 16
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QUEUE_BEFORE_SENDING equ 1 ; 1 or 0 (enable or disable) currently only affects ethernet
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QUEUE_BEFORE_SENDING equ 0 ; 1 or 0 (enable or disable) currently only affects ethernet
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MIN_EPHEMERAL_PORT equ 49152
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MAX_EPHEMERAL_PORT equ 61000
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ETHER equ 1337 ; TODO: find another value for this (how does it work in posix ?)
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ETHER equ 1337 ; TODO: find another value for this (how does it work in posix ?)
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ETHER_ARP equ 0x0608
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AF_UNSPEC equ 0
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@@ -207,35 +210,230 @@ end if
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;
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; This is the first of two functions needed to calculate the TCP checksum.
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;
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; IN: edx = start offeset for semi-checksum
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; IN: edx = start offset for semi-checksum
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; esi = pointer to data
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; ecx = data size
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; OUT: edx = semi-checksum
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;
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;
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; Code was optimized by diamond
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;
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;-----------------------------------------------------------------
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align 4
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checksum_1:
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xor eax, eax
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shr ecx, 1
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pushf
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.loop:
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lodsw
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xchg al, ah
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add edx, eax
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loop .loop
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jz .no_2
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shr ecx, 1
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pushf
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jz .no_4
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shr ecx, 1
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pushf
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jz .no_8
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.loop:
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add dl, [esi+1]
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adc dh, [esi+0]
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adc dl, [esi+3]
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adc dh, [esi+2]
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adc dl, [esi+5]
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adc dh, [esi+4]
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adc dl, [esi+7]
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adc dh, [esi+6]
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adc edx, 0
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add esi, 8
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dec ecx
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jnz .loop
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adc edx, 0
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.no_8:
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popf
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jnc .no_4
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add dl, [esi+1]
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adc dh, [esi+0]
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adc dl, [esi+3]
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adc dh, [esi+2]
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adc edx, 0
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add esi, 4
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.no_4:
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popf
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jnc .no_2
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add dl, [esi+1]
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adc dh, [esi+0]
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adc edx, 0
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inc ecx
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inc ecx
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.no_2:
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popf
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jnc .end
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add dh, [esi]
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add dh, [esi+0]
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adc edx, 0
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.end:
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ret
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;IN: 12 bytes of pseudoheader pushed onto the stack
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; edx = start offset
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;
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; OUT: pseudochecksum in edx
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align 4
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checksum_pseudoheader:
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add dl, [esp+5]
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adc dh, [esp+4]
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adc dl, [esp+7]
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adc dh, [esp+6]
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adc dl, [esp+9]
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adc dh, [esp+8]
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adc dl, [esp+11]
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adc dh, [esp+10]
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adc dl, [esp+13]
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adc dh, [esp+12]
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adc dl, [esp+15]
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adc dh, [esp+14]
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adc edx,0
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ret 12
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align 4
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checksum_ip_header:
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; This is the fast procedure to create or check a IP header without options
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;
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; To create a new checksum, the checksum field must be set to 0 before computation
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;
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; To check an existing checksum, leave the checksum as is, and it will be 0 after this procedure, if it was correct
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xor edx, edx
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add dl, [esi+1]
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adc dh, [esi+0]
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adc dl, [esi+3]
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adc dh, [esi+2]
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adc dl, [esi+5]
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adc dh, [esi+4]
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adc dl, [esi+7]
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adc dh, [esi+6]
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adc dl, [esi+9]
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adc dh, [esi+8]
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; we skip 11th and 12th byte, they are the checksum bytes and should be 0 for re-calculation
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adc dl, [esi+13]
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adc dh, [esi+12]
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adc dl, [esi+15]
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adc dh, [esi+14]
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adc dl, [esi+17]
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adc dh, [esi+16]
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adc dl, [esi+19]
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adc dh, [esi+18]
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adc edx, 0
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.end:
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call checksum_2
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neg word [esi+10] ; zero will stay zero so we jsut get the checksum
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add word [esi+10], dx ; , else we will get (new checksum - old checksum) in the end, wich should be 0 :)
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ret
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align 4
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checksum_udp:
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; This is the fast procedure to create or check a IP header without options
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;
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; To create a new checksum, the checksum field must be set to 0 before computation
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;
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; To check an existing checksum, leave the checksum as is, and it will be 0 after this procedure, if it was correct
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xor edx, edx
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add dl, [esi+1]
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adc dh, [esi+0]
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adc dl, [esi+3]
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adc dh, [esi+2]
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adc dl, [esi+5]
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adc dh, [esi+4]
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adc dl, [esi+7]
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adc dh, [esi+6]
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adc dl, [esi+9]
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adc dh, [esi+8]
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; we skip 11th and 12th byte, they are the checksum bytes and should be 0 for re-calculation
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adc dl, [esi+13]
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adc dh, [esi+12]
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adc dl, [esi+15]
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adc dh, [esi+14]
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adc dl, [esi+17]
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adc dh, [esi+16]
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adc dl, [esi+19]
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adc dh, [esi+18]
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adc edx, 0
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call checksum_2
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neg word [esi+10] ; zero will stay zero so we jsut get the checksum
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add word [esi+10], dx ; , else we will get (new checksum - old checksum) in the end, wich should be 0 :)
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ret
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;-----------------------------------------------------------------
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;
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; checksum_2
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@@ -400,3 +598,6 @@ sys_protocols:
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.return:
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mov [esp+28+4], eax
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ret
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__DEBUG_LEVEL__ equ __DEBUG_LEVEL_OLD__
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