1025 lines
24 KiB
PHP
1025 lines
24 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2008. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;; STACK.INC ;;
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;; ;;
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;; TCP/IP stack for Menuet OS ;;
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;; ;;
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;; Copyright 2002 Mike Hibbett, mikeh@oceanfree.net ;;
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;; ;;
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;; See file COPYING for details ;;
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;; ;;
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;; Version 0.7 ;;
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;; Added a timer per socket to allow delays when rx window ;;
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;; gets below 1KB ;;
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;; ;;
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;;10.01.2007 Bugfix for checksum function from Paolo Franchetti ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision$
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;*******************************************************************
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; Interface
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; The interfaces defined in ETHERNET.INC plus:
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; stack_init
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; stack_handler
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; app_stack_handler
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; app_socket_handler
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; checksum
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;
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;*******************************************************************
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uglobal
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StackCounters:
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dumped_rx_count dd 0
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arp_tx_count: dd 0
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arp_rx_count: dd 0
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ip_rx_count: dd 0
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ip_tx_count: dd 0
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endg
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; socket buffers
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SOCKETBUFFSIZE equ 4096 ; state + config + buffer.
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SOCKETHEADERSIZE equ SOCKET.rxData ; thus 4096 - SOCKETHEADERSIZE bytes data
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;NUM_SOCKETS equ 16 ; Number of open sockets supported. Was 20
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; IPBUFF status values
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BUFF_EMPTY equ 0
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BUFF_RX_FULL equ 1
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BUFF_ALLOCATED equ 2
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BUFF_TX_FULL equ 3
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NUM_IPBUFFERS equ 20 ; buffers allocated for TX/RX
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NUMQUEUES equ 4
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EMPTY_QUEUE equ 0
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IPIN_QUEUE equ 1
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IPOUT_QUEUE equ 2
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NET1OUT_QUEUE equ 3
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NO_BUFFER equ 0xFFFF
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IPBUFFSIZE equ 1500 ; MTU of an ethernet packet
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NUMQUEUEENTRIES equ NUM_IPBUFFERS
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NUMRESENDENTRIES equ 18 ; Buffers for TCP resend packets
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; These are the 0x40 function codes for application access to the stack
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STACK_DRIVER_STATUS equ 52
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SOCKET_INTERFACE equ 53
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; 128KB allocated for the stack and network driver buffers and other
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; data requirements
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;stack_data_start equ 0x700000
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;eth_data_start equ 0x700000
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;stack_data equ 0x704000
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;stack_data_end equ 0x71ffff
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; 32 bit word
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stack_config equ stack_data
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; 32 bit word - IP Address in network format
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stack_ip equ stack_data + 4
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; 1 byte. 0 == inactive, 1 = active
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ethernet_active equ stack_data + 9
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; TODO :: empty memory area
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; Address of selected socket
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;sktAddr equ stack_data + 32
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; Parameter to checksum routine - data ptr
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checkAdd1 equ stack_data + 36
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; Parameter to checksum routine - 2nd data ptr
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checkAdd2 equ stack_data + 40
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; Parameter to checksum routine - data size
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checkSize1 equ stack_data + 44
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; Parameter to checksum routine - 2nd data size
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checkSize2 equ stack_data + 46
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; result of checksum routine
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checkResult equ stack_data + 48
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; holds the TCP/UDP pseudo header. SA|DA|0|prot|UDP len|
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pseudoHeader equ stack_data + 50
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; receive and transmit IP buffer allocation
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;sockets equ stack_data + 62
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Next_free2 equ stack_data + 62;Next_free2 equ sockets + (SOCKETBUFFSIZE * NUM_SOCKETS)
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; 1560 byte buffer for rx / tx ethernet packets
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Ether_buffer equ Next_free2
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Next_free3 equ Ether_buffer + 1518
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last_1sTick equ Next_free3
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IPbuffs equ Next_free3 + 1
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queues equ IPbuffs + ( NUM_IPBUFFERS * IPBUFFSIZE )
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queueList equ queues + (2 * NUMQUEUES)
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last_1hsTick equ queueList + ( 2 * NUMQUEUEENTRIES )
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;resendQ equ queueList + ( 2 * NUMQUEUEENTRIES )
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;resendBuffer equ resendQ + ( 4 * NUMRESENDENTRIES ) ; for TCP
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; equ resendBuffer + ( IPBUFFSIZE * NUMRESENDENTRIES )
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;resendQ equ 0x770000
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;resendBuffer equ resendQ + ( 4 * NUMRESENDENTRIES ) ; for TCP ; XTODO: validate size
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resendBuffer equ resendQ + ( 8 * NUMRESENDENTRIES ) ; for TCP
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uglobal
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net_sockets rd 2
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endg
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; simple macro for memory set operation
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macro _memset_dw adr,value,amount
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{
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mov edi, adr
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mov ecx, amount
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if value = 0
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xor eax, eax
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else
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mov eax, value
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end if
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cld
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rep stosd
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}
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; Below, the main network layer source code is included
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;
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include "queue.inc"
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include "eth_drv/ethernet.inc"
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include "ip.inc"
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include "socket.inc"
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;***************************************************************************
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; Function
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; stack_init
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;
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; Description
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; Clear all allocated memory to zero. This ensures that
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; on startup, the stack is inactive, and consumes no resources
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; This is a kernel function, called prior to the OS main loop
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; in set_variables
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;
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;***************************************************************************
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stack_init:
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; Init two address spaces with default values
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_memset_dw stack_data_start, 0, 0x20000/4
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_memset_dw resendQ, 0, NUMRESENDENTRIES * 2
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mov [net_sockets], 0
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mov [net_sockets + 4], 0
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; Queries initialization
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call queueInit
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; The following block sets up the 1s timer
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mov al, 0x0
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out 0x70, al
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in al, 0x71
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mov [last_1sTick], al
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ret
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;***************************************************************************
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; Function
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; stack_handler
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;
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; Description
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; The kernel loop routine for the stack
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; This is a kernel function, called in the main loop
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;
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;***************************************************************************
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align 4
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stack_handler:
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call ethernet_driver
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call ip_rx
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; Test for 10ms tick, call tcp timer
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mov eax, [timer_ticks] ;[0xfdf0]
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cmp eax, [last_1hsTick]
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je sh_001
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mov [last_1hsTick], eax
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call tcp_tx_handler
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sh_001:
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; Test for 1 second event, call 1s timer functions
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mov al, 0x0 ;second
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out 0x70, al
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in al, 0x71
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cmp al, [last_1sTick]
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je sh_exit
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mov [last_1sTick], al
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stdcall arp_table_manager, ARP_TABLE_TIMER, 0, 0
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call tcp_tcb_handler
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sh_exit:
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ret
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Checksum [by Johnny_B]
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;; IN:
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;; buf_ptr=POINTER to buffer
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;; buf_size=SIZE of buffer
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;; OUT:
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;; AX=16-bit checksum
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;; Saves all used registers
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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proc checksum_jb stdcall uses ebx esi ecx,\
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buf_ptr:DWORD, buf_size:DWORD
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xor eax, eax
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xor ebx, ebx ;accumulator
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mov esi, dword[buf_ptr]
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mov ecx, dword[buf_size]
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shr ecx, 1 ; ecx=ecx/2
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jnc @f ; if CF==0 then size is even number
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mov bh, byte[esi + ecx*2]
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@@:
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cld
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.loop:
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lodsw ;eax=word[esi],esi=esi+2
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xchg ah,al ;cause must be a net byte-order
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add ebx, eax
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loop .loop
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mov eax, ebx
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shr eax, 16
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add ax, bx
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not ax
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ret
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endp
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;***************************************************************************
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; Function
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; checksum
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;
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; Description
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; checkAdd1,checkAdd2, checkSize1, checkSize2, checkResult
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; Dont break anything; Most registers are used by the caller
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; This code is derived from the 'C' source, cksum.c, in the book
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; Internetworking with TCP/IP Volume II by D.E. Comer
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;
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;***************************************************************************
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checksum:
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pusha
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mov eax, [checkAdd1]
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xor edx, edx ; edx is the accumulative checksum
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xor ebx, ebx
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mov cx, [checkSize1]
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shr cx, 1
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jz cs1_1
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cs1:
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mov bh, [eax]
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mov bl, [eax + 1]
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add eax, 2
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add edx, ebx
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loopw cs1
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cs1_1:
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and word [checkSize1], 0x01
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jz cs_test2
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mov bh, [eax]
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xor bl, bl
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add edx, ebx
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cs_test2:
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mov cx, [checkSize2]
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cmp cx, 0
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jz cs_exit ; Finished if no 2nd buffer
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mov eax, [checkAdd2]
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shr cx, 1
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jz cs2_1
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cs2:
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mov bh, [eax]
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mov bl, [eax + 1]
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add eax, 2
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add edx, ebx
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loopw cs2
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cs2_1:
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and word [checkSize2], 0x01
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jz cs_exit
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mov bh, [eax]
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xor bl, bl
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add edx, ebx
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cs_exit:
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mov ebx, edx
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shr ebx, 16
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and edx, 0xffff
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add edx, ebx
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mov eax, edx
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shr eax, 16
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add edx, eax
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not dx
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mov [checkResult], dx
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popa
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ret
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;***************************************************************************
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; Function
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; app_stack_handler
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;
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; Description
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; This is an application service, called by int 0x40, function 52
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; It provides application access to the network interface layer
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;
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;***************************************************************************
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app_stack_handler:
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cmp eax, 0
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jnz not0
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; Read the configuration word
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mov eax, [stack_config]
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ret
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not0:
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cmp eax, 1
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jnz not1
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; read the IP address
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mov eax, [stack_ip]
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ret
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not1:
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cmp eax, 2
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jnz not2
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; write the configuration word
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mov [stack_config], ebx
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; <Slip shouldn't be active anyway - thats an operational issue.>
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; If ethernet now enabled, probe for the card, reset it and empty
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; the packet buffer
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; If all successfull, enable the card.
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; If ethernet now disabled, set it as disabled. Should really
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; empty the tcpip data area too.
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; ethernet interface is '3' in ls 7 bits
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and bl, 0x7f
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cmp bl, 3
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je ash_eth_enable
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; Ethernet isn't enabled, so make sure that the card is disabled
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mov [ethernet_active], byte 0
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ret
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ash_eth_enable:
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; Probe for the card. This will reset it and enable the interface
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; if found
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call eth_probe
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cmp eax, 0
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je ash_eth_done ; Abort if no hardware found
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mov [ethernet_active], byte 1
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ash_eth_done:
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ret
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not2:
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cmp eax, 3
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jnz not3
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; write the IP Address
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mov [stack_ip], ebx
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ret
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;old functions was deleted
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not3:
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cmp eax, 6
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jnz not6
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; Insert an IP packet into the stacks received packet queue
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call stack_insert_packet
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ret
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not6:
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cmp eax, 7
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jnz not7
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; Test for any packets queued for transmission over the network
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not7:
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cmp eax, 8
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jnz not8
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call stack_get_packet
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; Extract a packet queued for transmission by the network
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ret
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not8:
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cmp eax, 9
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jnz not9
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; read the gateway IP address
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mov eax, [gateway_ip]
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ret
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not9:
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cmp eax, 10
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jnz not10
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; read the subnet mask
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mov eax, [subnet_mask]
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ret
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not10:
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cmp eax, 11
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jnz not11
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; write the gateway IP Address
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mov [gateway_ip], ebx
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ret
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not11:
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cmp eax, 12
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jnz not12
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; write the subnet mask
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mov [subnet_mask], ebx
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not12:
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cmp eax, 13
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jnz not13
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; read the dns
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mov eax, [dns_ip]
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ret
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not13:
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cmp eax, 14
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jnz not14
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; write the dns IP Address
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mov [dns_ip], ebx
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ret
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;<added by Frank Sommer>
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not14:
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cmp eax, 15
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jnz not15
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; in ebx we need 4 to read the last 2 bytes
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cmp ebx, dword 4
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je read
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; or we need 0 to read the first 4 bytes
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cmp ebx, dword 0
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jnz param_error
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; read MAC, returned (in mirrored byte order) in eax
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read:
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mov eax, [node_addr + ebx]
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jmp @f
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param_error:
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mov eax, -1 ; params not accepted
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@@:
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ret
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; 0 -> arp_probe
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; 1 -> arp_announce
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; 2 -> arp_responce (not supported yet)
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not15: ; ARP stuff
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cmp eax, 16
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jnz not16
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cmp ebx, 0
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je a_probe
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cmp ebx, 1
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je a_ann ; arp announce
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; cmp ebx,2
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; jne a_resp ; arp response
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jmp param15_error
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; arp probe, sender IP must be set to 0.0.0.0, target IP is set to address being probed
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; ecx: pointer to target MAC, MAC should set to 0 by application
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; edx: target IP
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a_probe:
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push dword [stack_ip]
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mov edx, [stack_ip]
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mov [stack_ip], dword 0
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mov esi, ecx ; pointer to target MAC address
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call arp_request
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pop dword [stack_ip]
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jmp @f
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; arp announce, sender IP must be set to target IP
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; ecx: pointer to target MAC
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a_ann:
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mov edx, [stack_ip]
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mov esi, ecx ; pointer to target MAC address
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call arp_request
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jmp @f
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param15_error:
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mov eax, -1
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@@:
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ret
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;</added by Frank Sommer>
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; modified by [smb]
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;<added by Johnny_B>
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; ARPTable manager interface
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not16:
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cmp eax, 17
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jnz stack_driver_end
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;see "proc arp_table_manager" for more details
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stdcall arp_table_manager,ebx,ecx,edx ;Opcode,Index,Extra
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ret
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;</added by Johnny_B>
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stack_driver_end:
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ret
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|
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;***************************************************************************
|
|
; Function
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|
; 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
|
|
;
|
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;***************************************************************************
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|
app_socket_handler:
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cmp eax, 0
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jnz nots0
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call socket_open
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ret
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nots0:
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cmp eax, 1
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jnz nots1
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call socket_close
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ret
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nots1:
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cmp eax, 2
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jnz nots2
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call socket_poll
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ret
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nots2:
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cmp eax, 3
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jnz nots3
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call socket_read
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ret
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nots3:
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cmp eax, 4
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jnz nots4
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call socket_write
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ret
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nots4:
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cmp eax, 5
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jnz nots5
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call socket_open_tcp
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|
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,[TASK_BASE]
|
|
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,[TASK_BASE]
|
|
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
|
|
|