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Bugfixes in TCP.

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git-svn-id: svn://kolibrios.org@4339 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
hidnplayr 2013-12-10 21:08:29 +00:00
parent d15d08a79a
commit d148603f7d
2 changed files with 57 additions and 39 deletions
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5
kernel/trunk/network/socket.inc
View File

@ -92,8 +92,8 @@ struct TCP_SOCKET IP_SOCKET
SND_MAX dd ?
; congestion control
SND_CWND dd ?
SND_SSTHRESH dd ?
SND_CWND dd ? ; congestion window
SND_SSTHRESH dd ? ; slow start threshold
;----------------------
; Transmit timing stuff
@ -2085,7 +2085,6 @@ SOCKET_num_to_ptr:
mov eax, [eax + SOCKET.NextPtr]
or eax, eax
jz .error
diff16 "tetten", 0, $
cmp [eax + SOCKET.Number], ecx
jne .next_socket

89
kernel/trunk/network/tcp_input.inc
View File

@ -78,7 +78,11 @@ TCP_input:
align 4
TCP_process_input:
proc TCP_process_input
locals
dataoffset dd ?
endl
xor esi, esi
mov ecx, MANUAL_DESTROY
@ -123,12 +127,13 @@ TCP_process_input:
.checksum_ok:
; Verify the data offset
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_no_socket ; If not, drop the packet
movzx eax, [edx + TCP_header.DataOffset]
and al, 0xf0 ; Calculate TCP segment header size (throwing away unused reserved bits in TCP header)
shr al, 2
cmp al, sizeof.TCP_header ; Now see if it's at least the size of a standard TCP header
jb .drop_no_socket ; If not, drop the packet
mov [dataoffset], eax
sub ecx, eax ; substract TCP header size from total segment size
jb .drop_no_socket ; If total segment size is less then the advertised header size, drop packet
DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: %u bytes of data\n", ecx
@ -267,18 +272,18 @@ TCP_process_input:
;--------------------
; Process TCP options
;;; FIXME: for LISTEN, options should be called after we determined route, we need it for MSS
;;; cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN ; no options when in listen state
;;; jz .not_uni_xfer ; also no header prediction
push ecx
movzx ecx, [edx + TCP_header.DataOffset]
mov ecx, [dataoffset]
cmp ecx, sizeof.TCP_header ; Does header contain any options?
je .no_options
DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Segment has options\n"
;;; FIXME: for LISTEN, options should be called after we determined route, we need it for MSS
;;; cmp [ebx + TCP_SOCKET.t_state], TCPS_LISTEN ; no options when in listen state
;;; jz .not_uni_xfer ; also no header prediction
add ecx, edx
lea esi, [edx + sizeof.TCP_header]
@ -311,9 +316,10 @@ TCP_process_input:
test [edx + TCP_header.Flags], TH_SYN
jz @f
xor eax, eax
lodsw
rol ax, 8
DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Maxseg=%u\n", ax
DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: Maxseg=%u\n", eax
call TCP_mss
@@:
jmp .opt_loop
@ -538,7 +544,7 @@ TCP_process_input:
add [ebx + TCP_SOCKET.RCV_NXT], ecx ; Update sequence number with number of bytes we have copied
movzx esi, [edx + TCP_header.DataOffset]
mov esi, [dataoffset]
add esi, edx
lea eax, [ebx + STREAM_SOCKET.rcv]
call SOCKET_ring_write ; Add the data to the socket buffer
@ -583,8 +589,9 @@ TCP_process_input:
;----------------------------
; trim any data not in window
; check for duplicate data at beginning of segment (635)
; 1. Check for duplicate data at beginning of segment
; Calculate number of bytes we need to drop
mov eax, [ebx + TCP_SOCKET.RCV_NXT]
sub eax, [edx + TCP_header.SequenceNumber]
jle .no_duplicate
@ -609,7 +616,7 @@ TCP_process_input:
dec eax
.no_dup_syn:
; Check for entire duplicate segment (646)
; 2. Check for entire duplicate segment
cmp eax, ecx ; eax holds number of bytes to drop, ecx is data size
jb .duplicate
jnz @f
@ -623,16 +630,19 @@ TCP_process_input:
; send an ACK and resynchronize and drop any data.
; But keep on processing for RST or ACK
DEBUGF DEBUG_NETWORK_VERBOSE, "616\n"
or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW
mov eax, ecx
;TODO: update stats
;;; TODO: update stats
;-----------------------------------------------
; Remove duplicate data and update urgent offset
.duplicate:
;;; TODO: 677
DEBUGF 1, "TCP_input: trimming duplicate data\n"
; Trim data from left side of window
add [dataoffset], eax
add [edx + TCP_header.SequenceNumber], eax
sub ecx, eax
@ -643,10 +653,10 @@ TCP_process_input:
@@:
;--------------------------------------------------
; Handle data that arrives after process terminates (687)
; Handle data that arrives after process terminates
.no_duplicate:
cmp [ebx + SOCKET.PID], 0
cmp [ebx + SOCKET.PID], 0 ;;; TODO: use socket flags instead??
jne .not_terminated
cmp [ebx + TCP_SOCKET.t_state], TCPS_CLOSE_WAIT
jbe .not_terminated
@ -659,7 +669,7 @@ TCP_process_input:
jmp .respond_seg_reset
;----------------------------------------
; Remove data beyond right edge of window (700-736)
; Remove data beyond right edge of window
.not_terminated:
mov eax, [edx + TCP_header.SequenceNumber]
@ -688,29 +698,26 @@ TCP_process_input:
jmp .findpcb ; FIXME: skip code for unscaling window, ...
.no_new_request:
; If window is closed can only take segments at window edge, and have to drop data and PUSH from
; If window is closed, we can only take segments at window edge, and have to drop data and PUSH from
; incoming segments. Continue processing, but remember to ACK. Otherwise drop segment and ACK
cmp [ebx + TCP_SOCKET.RCV_WND], 0
jne .drop_after_ack
mov eax, [edx + TCP_header.SequenceNumber]
cmp eax, [ebx + TCP_SOCKET.RCV_NXT]
mov esi, [edx + TCP_header.SequenceNumber]
cmp esi, [ebx + TCP_SOCKET.RCV_NXT]
jne .drop_after_ack
DEBUGF DEBUG_NETWORK_VERBOSE, "690\n"
or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW
;;; TODO: update stats
jmp .no_excess_data
.dont_drop_all:
;;; TODO: update stats
;;; TODO: 733
sub ecx, eax
DEBUGF 1, "Trimming %u bytes from the right of the window\n"
sub ecx, eax ; remove data from the right side of window (decrease data length)
and [ebx + TCP_SOCKET.t_flags], not (TH_PUSH or TH_FIN)
.no_excess_data:
;-----------------
; Record timestamp (737-746)
; Record timestamp
; If last ACK falls within this segments sequence numbers, record its timestamp
test [ebx + TCP_SOCKET.temp_bits], TCP_BIT_TIMESTAMP
@ -1359,7 +1366,16 @@ align 4
inc [edx + TCP_header.SequenceNumber]
;;; TODO: Drop any received data that follows receive window (590)
; Drop any received data that doesnt fit in the receive window.
cmp ecx, [ebx + TCP_SOCKET.RCV_WND]
jbe .dont_trim
DEBUGF DEBUG_NETWORK_VERBOSE, "TCP_input: received data does not fit in window, trimming %u bytes\n", eax
mov ecx, [ebx + TCP_SOCKET.RCV_WND]
and [edx + TCP_header.Flags], not (TH_FIN)
;;; TODO: update stats
.dont_trim:
mov eax, [edx + TCP_header.SequenceNumber]
mov [ebx + TCP_SOCKET.RCV_UP], eax
@ -1479,7 +1495,7 @@ align 4
or [ebx + TCP_SOCKET.t_flags], TF_DELACK
pusha
movzx esi, [edx + TCP_header.DataOffset]
mov esi, [dataoffset]
add esi, edx
lea eax, [ebx + STREAM_SOCKET.rcv]
call SOCKET_ring_write ; Add the data to the socket buffer
@ -1493,14 +1509,15 @@ align 4
jmp .data_done
.out_of_order:
DEBUGF DEBUG_NETWORK_VERBOSE, "TCP data is out of order\n"
DEBUGF DEBUG_NETWORK_VERBOSE, "TCP data is out of order!\nSequencenumber is %u, we expected %u.\n", \
[edx + TCP_header.SequenceNumber], [ebx + TCP_SOCKET.RCV_NXT]
; Uh-oh, some data is out of order, lets call TCP reassemble for help
call TCP_reassemble
DEBUGF DEBUG_NETWORK_VERBOSE, "1470\n"
; Generate ACK immediately, to let the other end know that a segment was received out of order,
; and to tell it what sequence number is expected. This aids the fast-retransmit algorithm.
or [ebx + TCP_SOCKET.t_flags], TF_ACKNOW
.data_done:
@ -1703,3 +1720,5 @@ align 4
call NET_packet_free
add esp, 4
jmp .loop
endp