;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; STACK.INC ;;
;; ;;
;; TCP/IP stack for Menuet OS ;;
;; ;;
;; Version 0.7 4th July 2004 ;;
;; ;;
;; Copyright 2002 Mike Hibbett, mikeh@oceanfree.net ;;
;; ;;
;; See file COPYING for details ;;
;; ;;
;; Version 0.7 ;;
;; Added a timer per socket to allow delays when rx window ;;
;; gets below 1KB ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;*******************************************************************
; Interface
; The interfaces defined in ETHERNET.INC plus:
; stack_init
; stack_handler
; app_stack_handler
; app_socket_handler
; checksum
;
;*******************************************************************
uglobal
StackCounters:
dumped_rx_count: dd 0
arp_tx_count: dd 0
arp_rx_count: dd 0
ip_rx_count: dd 0
ip_tx_count: dd 0
endg
; socket buffers
SOCKETBUFFSIZE equ 4096 ; state + config + buffer.
SOCKETHEADERSIZE equ 76 ; thus 4096 - SOCKETHEADERSIZE bytes data
NUM_SOCKETS equ 16 ; Number of open sockets supported. Was 20
; IPBUFF status values
BUFF_EMPTY equ 0
BUFF_RX_FULL equ 1
BUFF_ALLOCATED equ 2
BUFF_TX_FULL equ 3
NUM_IPBUFFERS equ 20 ; buffers allocated for TX/RX
NUMQUEUES equ 4
EMPTY_QUEUE equ 0
IPIN_QUEUE equ 1
IPOUT_QUEUE equ 2
NET1OUT_QUEUE equ 3
NO_BUFFER equ 0xFFFF
IPBUFFSIZE equ 1500 ; MTU of an ethernet packet
NUMQUEUEENTRIES equ NUM_IPBUFFERS
NUMRESENDENTRIES equ 18 ; Buffers for TCP resend packets
; These are the 0x40 function codes for application access to the stack
STACK_DRIVER_STATUS equ 52
SOCKET_INTERFACE equ 53
; 128KB allocated for the stack and network driver buffers and other
; data requirements
stack_data_start equ 0x700000
eth_data_start equ 0x700000
stack_data equ 0x704000
stack_data_end equ 0x71ffff
; 32 bit word
stack_config equ stack_data
; 32 bit word - IP Address in network format
stack_ip equ stack_data + 4
; 1 byte. 0 == inactive, 1 = active
ethernet_active equ stack_data + 9
; TODO :: empty memory area
; Address of selected socket
sktAddr equ stack_data + 32
; Parameter to checksum routine - data ptr
checkAdd1 equ stack_data + 36
; Parameter to checksum routine - 2nd data ptr
checkAdd2 equ stack_data + 40
; Parameter to checksum routine - data size
checkSize1 equ stack_data + 44
; Parameter to checksum routine - 2nd data size
checkSize2 equ stack_data + 46
; result of checksum routine
checkResult equ stack_data + 48
; holds the TCP/UDP pseudo header. SA|DA|0|prot|UDP len|
pseudoHeader equ stack_data + 50
; receive and transmit IP buffer allocation
sockets equ stack_data + 62
Next_free2 equ sockets + (SOCKETBUFFSIZE * NUM_SOCKETS)
; 1560 byte buffer for rx / tx ethernet packets
Ether_buffer equ Next_free2
Next_free3 equ Ether_buffer + 1518
last_1sTick equ Next_free3
IPbuffs equ Next_free3 + 1
queues equ IPbuffs + ( NUM_IPBUFFERS * IPBUFFSIZE )
queueList equ queues + (2 * NUMQUEUES)
last_1hsTick equ queueList + ( 2 * NUMQUEUEENTRIES )
;resendQ equ queueList + ( 2 * NUMQUEUEENTRIES )
;resendBuffer equ resendQ + ( 4 * NUMRESENDENTRIES ) ; for TCP
; equ resendBuffer + ( IPBUFFSIZE * NUMRESENDENTRIES )
resendQ equ 0x770000
resendBuffer equ resendQ + ( 4 * NUMRESENDENTRIES ) ; for TCP
; simple macro for memory set operation
macro _memset_dw adr,value,amount
{
mov edi, adr
mov ecx, amount
if value = 0
xor eax, eax
else
mov eax, value
end if
cld
rep stosd
}
; Below, the main network layer source code is included
;
include "queue.inc"
include "eth_drv/ethernet.inc"
include "ip.inc"
include "icmp.inc"
include "tcp.inc"
include "udp.inc"
include "socket.inc"
;***************************************************************************
; Function
; stack_init
;
; Description
; Clear all allocated memory to zero. This ensures that
; on startup, the stack is inactive, and consumes no resources
; This is a kernel function, called prior to the OS main loop
; in set_variables
;
;***************************************************************************
stack_init:
; Init two address spaces with default values
_memset_dw stack_data_start, 0, 0x20000/4
_memset_dw resendQ, 0xFFFFFFFF, NUMRESENDENTRIES
; Queries initialization
call queueInit
; The following block sets up the 1s timer
mov al, 0x0
out 0x70, al
in al, 0x71
mov [last_1sTick], al
ret
;***************************************************************************
; Function
; stack_handler
;
; Description
; The kernel loop routine for the stack
; This is a kernel function, called in the main loop
;
;***************************************************************************
stack_handler:
call ethernet_driver
call ip_rx
; Test for 10ms tick, call tcp timer
mov eax, [timer_ticks] ;[0xfdf0]
cmp eax, [last_1hsTick]
je sh_001
mov [last_1hsTick], eax
call tcp_tx_handler
sh_001:
; Test for 1 second event, call 1s timer functions
mov al, 0x0 ;second
out 0x70, al
in al, 0x71
cmp al, [last_1sTick]
je sh_exit
mov [last_1sTick], al
stdcall arp_table_manager, ARP_TABLE_TIMER, 0, 0
call tcp_tcb_handler
sh_exit:
ret
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Checksum [by Johnny_B]
;; IN:
;; buf_ptr=POINTER to buffer
;; buf_size=SIZE of buffer
;; OUT:
;; AX=16-bit checksum
;; Saves all used registers
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
proc checksum_jb stdcall uses ebx esi ecx,\
buf_ptr:DWORD, buf_size:DWORD
xor eax, eax
xor ebx, ebx ;accumulator
mov esi, dword[buf_ptr]
mov ecx, dword[buf_size]
shr ecx, 1 ; ecx=ecx/2
jnc @f ; if CF==0 then size is even number
mov bh, byte[esi + ecx*2]
@@:
cld
.loop:
lodsw ;eax=word[esi],esi=esi+2
xchg ah,al ;cause must be a net byte-order
add ebx, eax
loop .loop
mov eax, ebx
shr eax, 16
add ax, bx
not ax
ret
endp
;***************************************************************************
; Function
; checksum
;
; Description
; checkAdd1,checkAdd2, checkSize1, checkSize2, checkResult
; Dont break anything; Most registers are used by the caller
; This code is derived from the 'C' source, cksum.c, in the book
; Internetworking with TCP/IP Volume II by D.E. Comer
;
;***************************************************************************
checksum:
pusha
mov eax, [checkAdd1]
xor edx, edx ; edx is the accumulative checksum
xor ebx, ebx
mov cx, [checkSize1]
shr cx, 1
jz cs1_1
cs1:
mov bh, [eax]
mov bl, [eax + 1]
add eax, 2
add edx, ebx
loopw cs1
cs1_1:
and word [checkSize1], 0x01
jz cs_test2
mov bh, [eax]
xor bl, bl
add edx, ebx
cs_test2:
mov cx, [checkSize2]
cmp cx, 0
jz cs_exit ; Finished if no 2nd buffer
mov eax, [checkAdd2]
shr cx, 1
jz cs2_1
cs2:
mov bh, [eax]
mov bl, [eax + 1]
add eax, 2
add edx, ebx
loopw cs2
cs2_1:
and word [checkSize2], 0x01
jz cs_exit
mov bh, [eax]
xor bl, bl
add edx, ebx
cs_exit:
mov ebx, edx
shr ebx, 16
and edx, 0xffff
add edx, ebx
mov eax, edx
shr eax, 16
add edx, eax
not dx
mov [checkResult], dx
popa
ret
;***************************************************************************
; Function
; app_stack_handler
;
; Description
; This is an application service, called by int 0x40, function 52
; It provides application access to the network interface layer
;
;***************************************************************************
app_stack_handler:
cmp eax, 0
jnz not0
; Read the configuration word
mov eax, [stack_config]
ret
not0:
cmp eax, 1
jnz not1
; read the IP address
mov eax, [stack_ip]
ret
not1:
cmp eax, 2
jnz not2
; write the configuration word
mov [stack_config], ebx
; <Slip shouldn't be active anyway - thats an operational issue.>
; If ethernet now enabled, probe for the card, reset it and empty
; the packet buffer
; If all successfull, enable the card.
; If ethernet now disabled, set it as disabled. Should really
; empty the tcpip data area too.
; ethernet interface is '3' in ls 7 bits
and bl, 0x7f
cmp bl, 3
je ash_eth_enable
; Ethernet isn't enabled, so make sure that the card is disabled
mov [ethernet_active], byte 0
ret
ash_eth_enable:
; Probe for the card. This will reset it and enable the interface
; if found
call eth_probe
cmp eax, 0
je ash_eth_done ; Abort if no hardware found
mov [ethernet_active], byte 1
ash_eth_done:
ret
not2:
cmp eax, 3
jnz not3
; write the IP Address
mov [stack_ip], ebx
ret
;old functions was deleted
not3:
cmp eax, 6
jnz not6
; Insert an IP packet into the stacks received packet queue
call stack_insert_packet
ret
not6:
cmp eax, 7
jnz not7
; Test for any packets queued for transmission over the network
not7:
cmp eax, 8
jnz not8
call stack_get_packet
; Extract a packet queued for transmission by the network
ret
not8:
cmp eax, 9
jnz not9
; read the gateway IP address
mov eax, [gateway_ip]
ret
not9:
cmp eax, 10
jnz not10
; read the subnet mask
mov eax, [subnet_mask]
ret
not10:
cmp eax, 11
jnz not11
; write the gateway IP Address
mov [gateway_ip], ebx
ret
not11:
cmp eax, 12
jnz not12
; write the subnet mask
mov [subnet_mask], ebx
not12:
cmp eax, 13
jnz not13
; read the dns
mov eax, [dns_ip]
ret
not13:
cmp eax, 14
jnz not14
; write the dns IP Address
mov [dns_ip], ebx
ret
;<added by Frank Sommer>
not14:
cmp eax, 15
jnz not15
; in ebx we need 4 to read the last 2 bytes
cmp ebx, dword 4
je read
; or we need 0 to read the first 4 bytes
cmp ebx, dword 0
jnz param_error
; read MAC, returned (in mirrored byte order) in eax
read:
mov eax, [node_addr + ebx]
jmp @f
param_error:
mov eax, -1 ; params not accepted
@@:
ret
; 0 -> arp_probe
; 1 -> arp_announce
; 2 -> arp_responce (not supported yet)
not15: ; ARP stuff
cmp eax, 16
jnz not16
cmp ebx, 0
je a_probe
cmp ebx, 1
je a_ann ; arp announce
; cmp ebx,2
; jne a_resp ; arp response
jmp param15_error
; arp probe, sender IP must be set to 0.0.0.0, target IP is set to address being probed
; ecx: pointer to target MAC, MAC should set to 0 by application
; edx: target IP
a_probe:
push dword [stack_ip]
mov edx, [stack_ip]
mov [stack_ip], dword 0
mov esi, ecx ; pointer to target MAC address
call arp_request
pop dword [stack_ip]
jmp @f
; arp announce, sender IP must be set to target IP
; ecx: pointer to target MAC
a_ann:
mov edx, [stack_ip]
mov esi, ecx ; pointer to target MAC address
call arp_request
jmp @f
param15_error:
mov eax, -1
@@:
ret
;</added by Frank Sommer>
; modified by [smb]
;<added by Johnny_B>
; ARPTable manager interface
not16:
cmp eax, 17
jnz stack_driver_end
;see "proc arp_table_manager" for more details
stdcall arp_table_manager,ebx,ecx,edx ;Opcode,Index,Extra
ret
;</added by Johnny_B>
stack_driver_end:
ret
;***************************************************************************
; Function
; app_socket_handler
;
; Description
; This is an application service, called by int 0x40, function 53
; It provides application access to stack socket services
; such as opening sockets
;
;***************************************************************************
app_socket_handler:
cmp eax, 0
jnz nots0
call socket_open
ret
nots0:
cmp eax, 1
jnz nots1
call socket_close
ret
nots1:
cmp eax, 2
jnz nots2
call socket_poll
ret
nots2:
cmp eax, 3
jnz nots3
call socket_read
ret
nots3:
cmp eax, 4
jnz nots4
call socket_write
ret
nots4:
cmp eax, 5
jnz nots5
call socket_open_tcp
ret
nots5:
cmp eax, 6
jnz nots6
call socket_status
ret
nots6:
cmp eax, 7
jnz nots7
call socket_write_tcp
ret
nots7:
cmp eax, 8
jnz nots8
call socket_close_tcp
ret
nots8:
cmp eax, 9
jnz nots9
call is_localport_unused
ret
nots9:
cmp eax, 10
jnz nots10
mov eax,dword[drvr_cable]
test eax,eax
jnz @f ; if function is not implented, return -1
mov al,-1
ret
@@:
call dword[drvr_cable]
ret
nots10:
cmp eax, 11
jnz nots11
call socket_read_packet
ret
nots11:
cmp eax, 254
jnz notdump
ret
notdump:
cmp eax, 255
jnz notsdebug
; This sub function allows access to debugging information on the stack
; ebx holds the request:
; 100 : return length of empty queue
; 101 : return length of IPOUT QUEUE
; 102 : return length of IPIN QUEUE
; 103 : return length of NET1OUT QUEUE
; 200 : return # of ARP entries
; 201 : return size of ARP table ( max # entries )
; 202 : select ARP table entry #
; 203 : return IP of selected table entry
; 204 : return High 4 bytes of MAC address of selected table entry
; 205 : return low 2 bytes of MAC address of selected table entry
; 206 : return status word of selected table entry
; 207 : return Time to live of selected table entry
; 2 : return number of IP packets received
; 3 : return number of packets transmitted
; 4 : return number of received packets dumped
; 5 : return number of arp packets received
; 6 : return status of packet driver
; ( 0 == not active, FFFFFFFF = successful )
call stack_internal_status
ret
notsdebug:
; Invalid Option
ret
uglobal
ARPTmp:
times 14 db 0
endg
;***************************************************************************
; Function
; stack_internal_status
;
; Description
; Returns information about the internal status of the stack
; This is only useful for debugging
; It works with the ethernet driver
; sub function in ebx
; return requested data in eax
;
;***************************************************************************
stack_internal_status:
cmp ebx, 100
jnz notsis100
; 100 : return length of EMPTY QUEUE
mov ebx, EMPTY_QUEUE
call queueSize
ret
notsis100:
cmp ebx, 101
jnz notsis101
; 101 : return length of IPOUT QUEUE
mov ebx, IPOUT_QUEUE
call queueSize
ret
notsis101:
cmp ebx, 102
jnz notsis102
; 102 : return length of IPIN QUEUE
mov ebx, IPIN_QUEUE
call queueSize
ret
notsis102:
cmp ebx, 103
jnz notsis103
; 103 : return length of NET1OUT QUEUE
mov ebx, NET1OUT_QUEUE
call queueSize
ret
notsis103:
cmp ebx, 200
jnz notsis200
; 200 : return num entries in arp table
movzx eax, byte [NumARP]
ret
notsis200:
cmp ebx, 201
jnz notsis201
; 201 : return arp table size
mov eax, 20 ; ARP_TABLE_SIZE
ret
notsis201:
cmp ebx, 202
jnz notsis202
; 202 - read the requested table entry
; into a temporary buffer
; ecx holds the entry number
mov eax, ecx
mov ecx, 14 ; ARP_ENTRY_SIZE
mul ecx
mov ecx, [eax + ARPTable]
mov [ARPTmp], ecx
mov ecx, [eax + ARPTable+4]
mov [ARPTmp+4], ecx
mov ecx, [eax + ARPTable+8]
mov [ARPTmp+8], ecx
mov cx, [eax + ARPTable+12]
mov [ARPTmp+12], cx
ret
notsis202:
cmp ebx, 203
jnz notsis203
; 203 - return IP address
mov eax, [ARPTmp]
ret
notsis203:
cmp ebx, 204
jnz notsis204
; 204 - return MAC high dword
mov eax, [ARPTmp+4]
ret
notsis204:
cmp ebx, 205
jnz notsis205
; 205 - return MAC ls word
movzx eax, word [ARPTmp+8]
ret
notsis205:
cmp ebx, 206
jnz notsis206
; 206 - return status word
movzx eax, word [ARPTmp+10]
ret
notsis206:
cmp ebx, 207
jnz notsis207
; 207 - return ttl word
movzx eax, word [ARPTmp+12]
ret
notsis207:
cmp ebx, 2
jnz notsis2
; 2 : return number of IP packets received
mov eax, [ip_rx_count]
ret
notsis2:
cmp ebx, 3
jnz notsis3
; 3 : return number of packets transmitted
mov eax, [ip_tx_count]
ret
notsis3:
cmp ebx, 4
jnz notsis4
; 4 : return number of received packets dumped
mov eax, [dumped_rx_count]
ret
notsis4:
cmp ebx, 5
jnz notsis5
; 5 : return number of arp packets received
mov eax, [arp_rx_count]
ret
notsis5:
cmp ebx, 6
jnz notsis6
; 6 : return status of packet driver
; ( 0 == not active, FFFFFFFF = successful )
mov eax, [eth_status]
ret
notsis6:
xor eax, eax
ret
;***************************************************************************
; Function
; stack_get_packet
;
; Description
; extracts an IP packet from the NET1 output queue
; and sends the data to the calling process
; pointer to data in edx
; returns number of bytes read in eax
;
;***************************************************************************
stack_get_packet:
; Look for a buffer to tx
mov eax, NET1OUT_QUEUE
call dequeue
cmp ax, NO_BUFFER
je sgp_non_exit ; Exit if no buffer available
push eax ; Save buffer number for freeing at end
push edx
; convert buffer pointer eax to the absolute address
mov ecx, IPBUFFSIZE
mul ecx
add eax, IPbuffs
pop edx
push eax ; save address of IP data
; Get the address of the callers data
mov edi,[0x3010]
add edi,TASKDATA.mem_start
add edx,[edi]
mov edi, edx
pop eax
mov ecx, 1500 ; should get the actual number of bytes to write
mov esi, eax
cld
rep movsb ; copy the data across
; And finally, return the buffer to the free queue
pop eax
call freeBuff
mov eax, 1500
ret
sgp_non_exit:
xor eax, eax
ret
;***************************************************************************
; Function
; stack_insert_packet
;
; Description
; writes an IP packet into the stacks receive queue
; # of bytes to write in ecx
; pointer to data in edx
; returns 0 in eax ok, -1 == failed
;
;***************************************************************************
stack_insert_packet:
mov eax, EMPTY_QUEUE
call dequeue
cmp ax, NO_BUFFER
je sip_err_exit
push eax
; save the pointers to the data buffer & size
push edx
push ecx
; convert buffer pointer eax to the absolute address
mov ecx, IPBUFFSIZE
mul ecx
add eax, IPbuffs
mov edx, eax
; So, edx holds the IPbuffer ptr
pop ecx ; count of bytes to send
mov ebx, ecx ; need the length later
pop eax ; get callers ptr to data to send
; Get the address of the callers data
mov edi,[0x3010]
add edi,TASKDATA.mem_start
add eax,[edi]
mov esi, eax
mov edi, edx
cld
rep movsb ; copy the data across
pop ebx
mov eax, IPIN_QUEUE
call queue
inc dword [ip_rx_count]
mov eax, 0
ret
sip_err_exit:
mov eax, 0xFFFFFFFF
ret