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small updates and fixes in TCP for net branch

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git-svn-id: svn://kolibrios.org@2309 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
hidnplayr 2011-11-12 19:20:33 +00:00
parent 63bc53c598
commit 29c0d093db
2 changed files with 29 additions and 38 deletions
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2
kernel/branches/net/network/IPv4.inc
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@ -120,7 +120,7 @@ local .loop
macro IPv4_checksum ptr {
; This is the fast procedure to create or check a IP header without options
; This is the fast procedure to create or check an IP header without options
; To create a new checksum, the checksum field must be set to 0 before computation
; To check an existing checksum, leave the checksum as is, and it will be 0 after this procedure, if it was correct

57
kernel/branches/net/network/tcp_input.inc
View File

@ -34,41 +34,36 @@ $Revision$
align 4
TCP_input:
DEBUGF 1,"TCP_input size=%u ", ecx
; Offset must be greater than or equal to the size of the standard TCP header (20) and less than or equal to the TCP length.
DEBUGF 1,"TCP_input size=%u\n", ecx
movzx eax, [edx + TCP_header.DataOffset]
and eax, 0xf0
shr al, 2
DEBUGF 1,"headersize=%u\n", eax
cmp eax, TCP_header.DataOffset
jb .drop_not_locked
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
jb .drop_not_locked ; If not, drop the packet
;-------------------------------
; Now, re-calculate the checksum
push eax ecx edx
push ecx edx
pushw [edx + TCP_header.Checksum]
mov [edx + TCP_header.Checksum], 0
mov esi, edx
TCP_checksum (edi), (edi+4)
pop cx ; previous checksum
cmp cx, dx
pop edx ecx esi
pop edx ecx
jnz .drop_not_locked
DEBUGF 1,"Checksum is correct\n"
DEBUGF 1,"Checksum ok\n"
sub ecx, esi ; substract TCP header size from total segment size
jb .drop_not_locked
sub ecx, [edx + TCP_header.DataOffset] ; 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 esi, TCP_header.DataOffset + 12 ; Timestamp option is 12 bytes
cmp [edx + TCP_header.DataOffset], sizeof.TCP_header + 12 ; Timestamp option is 12 bytes
jb .no_timestamp
je .is_ok
@ -108,6 +103,7 @@ TCP_input:
; (IP Packet TCP Source Port = remote Port) OR (remote Port = 0)
mov ebx, net_sockets
mov si, [edx + TCP_header.DestinationPort]
.socket_loop:
mov ebx, [ebx + SOCKET.NextPtr]
@ -120,8 +116,7 @@ TCP_input:
cmp [ebx + SOCKET.Protocol], IP_PROTO_TCP
jne .socket_loop
mov ax, [edx + TCP_header.DestinationPort]
cmp [ebx + TCP_SOCKET.LocalPort], ax
cmp [ebx + TCP_SOCKET.LocalPort], si
jne .socket_loop
mov eax, [ebx + IP_SOCKET.RemoteIP]
@ -136,10 +131,9 @@ TCP_input:
je .found_socket
test ax, ax
jnz .socket_loop
.found_socket:
.found_socket: ; ebx now contains the socketpointer
DEBUGF 1,"Socket ptr: %x\n", ebx
; ebx now contains the pointer to the socket
;----------------------------
; Check if socket isnt closed
@ -158,7 +152,6 @@ TCP_input:
call wait_mutex
sub ebx, SOCKET.lock
DEBUGF 1,"Socket locked\n"
;---------------------------------------
@ -209,7 +202,8 @@ TCP_input:
;--------------------
; Process TCP options
cmp esi, TCP_header.DataOffset ; Does header contain any options?
mov eax, [edx + TCP_header.DataOffset]
cmp eax, TCP_header.DataOffset ; Does header contain any options?
je .no_options
DEBUGF 1,"Segment has options\n"
@ -217,7 +211,7 @@ TCP_input:
cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN ; no options when in listen state
jz .not_uni_xfer ; also no header prediction
lea eax, [edx + esi]
add eax, edx
lea esi, [edx + sizeof.TCP_header]
.opt_loop:
@ -413,8 +407,6 @@ TCP_input:
add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied
movzx esi, [edx + TCP_header.DataOffset]
and esi, 0xf0
shr esi, 2
add esi, edx
lea eax, [ebx + STREAM_SOCKET.rcv]
call SOCKET_ring_write ; Add the data to the socket buffer
@ -909,7 +901,8 @@ align 4
cmp eax, [ebx + TCP_SOCKET.SND_MAX]
ja .drop_with_reset
;;; update stats
;;; TODO: update stats
mov eax, ebx
call SOCKET_is_connected
mov [ebx + TCP_SOCKET.t_state], TCPS_ESTABLISHED
@ -921,11 +914,11 @@ align 4
test [ebx + TCP_SOCKET.t_flags], TF_REQ_SCALE
jz @f
;;; 810-811
push word [ebx + TCP_SOCKET.requested_s_scale] ; Set send and receive scale factors to the received values
pop word [ebx + TCP_SOCKET.SND_SCALE]
@@:
;;; 813 ?
;;; TODO: copy the data (if any) into the socket
mov eax, [edx + TCP_header.SequenceNumber]
dec eax
@ -949,7 +942,7 @@ align 4
DEBUGF 1,"Processing a duplicate ACK..\n"
cmp [ebx + TCP_SOCKET.timer_retransmission], 10000 ;;;;
cmp [ebx + TCP_SOCKET.timer_retransmission], 10000 ;;;; FIXME
ja @f
mov eax, [edx + TCP_header.AckNumber]
@ -1246,7 +1239,7 @@ align 4
cmp eax, [edx + TCP_header.AckNumber]
jne .no_window_update
movzx eax, [edx + TCP_header.Window]
mov eax, dword [edx + TCP_header.Window]
cmp eax, [ebx + TCP_SOCKET.SND_WND]
jbe .no_window_update
@ -1353,8 +1346,6 @@ align 4
;; TODO: check if data is in sequence !
movzx esi, [edx + TCP_header.DataOffset]
and esi, 0xf0
shr esi, 2
add esi, edx
or [ebx + TCP_SOCKET.t_flags], TF_DELACK