aabc2/KOS_qrcodes
1
0
Fork 0
forked from KolibriOS/kolibrios
Code Pull Requests Activity

more small updates and fixes in net branch

Browse Source 
git-svn-id: svn://kolibrios.org@2310 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
hidnplayr
2011-11-12 20:05:07 +00:00
parent 29c0d093db
commit 3ce07b4be0
5 changed files with 796 additions and 795 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
kernel/branches/net/network/tcp_input.inc
View File

@@ -24,7 +24,7 @@ $Revision$
; [esp+4] = buffer size
; ebx = ptr to device struct
; ecx = segment size
; edx = ptr to TCP segment
; esi = ptr to TCP segment
; edi = ptr to ipv4 source address, followed by ipv4 dest address
;
; OUT: /
@@ -36,18 +36,17 @@ TCP_input:
DEBUGF 1,"TCP_input size=%u\n", ecx
and [edx + TCP_header.DataOffset], 0xf0 ; Calculate TCP segment header size (throwing away unused reserved bits in TCP header)
shr [edx + TCP_header.DataOffset], 2
cmp [edx + TCP_header.DataOffset], sizeof.TCP_header ; Now see if it's at least the size of a standard TCP header
and [esi + TCP_header.DataOffset], 0xf0 ; Calculate TCP segment header size (throwing away unused reserved bits in TCP header)
shr [esi + TCP_header.DataOffset], 2
cmp [esi + TCP_header.DataOffset], sizeof.TCP_header ; Now see if it's at least the size of a standard TCP header
jb .drop_not_locked ; If not, drop the packet
;-------------------------------
; Now, re-calculate the checksum
push ecx edx
pushw [edx + TCP_header.Checksum]
mov [edx + TCP_header.Checksum], 0
mov esi, edx
push ecx esi
pushw [esi + TCP_header.Checksum]
mov [esi + TCP_header.Checksum], 0
TCP_checksum (edi), (edi+4)
pop cx ; previous checksum
cmp cx, dx
@@ -56,14 +55,15 @@ TCP_input:
DEBUGF 1,"Checksum ok\n"
sub ecx, [edx + TCP_header.DataOffset] ; substract TCP header size from total segment size
movzx eax, [edx + TCP_header.DataOffset]
sub ecx, eax ; substract TCP header size from total segment size
jb .drop_not_locked ; If total segment size is less then the advertised header size, drop packet
DEBUGF 1,"we got %u bytes of data\n", ecx
;-----------------------------------------------------------------------------------------
; Check if this packet has a timestamp option (We do it here so we can process it quickly)
cmp [edx + TCP_header.DataOffset], sizeof.TCP_header + 12 ; Timestamp option is 12 bytes
cmp eax, sizeof.TCP_header + 12 ; Timestamp option is 12 bytes
jb .no_timestamp
je .is_ok
@@ -202,8 +202,8 @@ TCP_input:
;--------------------
; Process TCP options
mov eax, [edx + TCP_header.DataOffset]
cmp eax, TCP_header.DataOffset ; Does header contain any options?
movzx eax, [edx + TCP_header.DataOffset]
cmp eax, sizeof.TCP_header ; Does header contain any options?
je .no_options
DEBUGF 1,"Segment has options\n"