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ctc_lcs.c
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ctc_lcs.c
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// ====================================================================
// Hercules LAN Channel Station Support
// ====================================================================
//
// Copyright (C) 2002-2008 by James A. Pierson (original author)
// Copyright (C) 2002-2008 by David B. Trout (current maintainer)
//
// $Id$
//
// $Log$
// Revision 1.79 2008/11/04 05:56:31 fish
// Put ensure consistent create_thread ATTR usage change back in
//
// Revision 1.78 2008/11/03 15:31:57 rbowler
// Back out consistent create_thread ATTR modification
//
// Revision 1.77 2008/10/18 09:32:21 fish
// Ensure consistent create_thread ATTR usage
//
// Revision 1.76 2008/08/19 21:36:37 fish
// Init LCS interface ASAP to fix wrong MAC being used
//
// Revision 1.75 2008/08/15 04:40:49 fish
// Trace LCS Command Frame packets as they are received,
// ensure iMaxFrameBufferSize greater than minimum allowed.
//
// Revision 1.74 2008/07/17 07:42:15 fish
// (extremely minor comment change only)
//
// Revision 1.73 2008/07/17 07:19:12 fish
// Fix FCS (Frame Check Sequence) bug in LCS_Write function
// and other minor bugs.
//
// Revision 1.71 2008/07/17 03:30:40 fish
// CTC/LCS cosmetic-only changes -- part 1
// (no actual functionality was changed!)
//
// Revision 1.70 2008/05/22 18:27:25 fish
// Fix read timeout bug in LCS logic
//
// Revision 1.69 2008/02/07 00:29:04 rbowler
// Solaris build support by Jeff Savit
//
// Revision 1.68 2008/01/11 21:33:21 fish
// new 'ctc' command to enable/disable debug option on demand
//
// Revision 1.67 2007/11/21 22:54:14 fish
// Use new BEGIN_DEVICE_CLASS_QUERY macro
//
// Revision 1.66 2007/08/17 00:59:40 fish
// Backout 28 Jul fix for LCS (fix was only meant for CTCI)
//
// Revision 1.65 2007/07/29 02:02:44 fish
// Fix day-1 CTCI/LCS bug found by Vince Weaver [[email protected]]
//
// Revision 1.64 2007/06/23 00:04:05 ivan
// Update copyright notices to include current year (2007)
//
// Revision 1.63 2007/02/25 15:05:46 fish
// Fix crash in LCS close if devinit of incomplete group
//
// Revision 1.62 2007/01/14 22:17:35 rbowler
// Correct compile error introduced by rev 1.61
//
// Revision 1.61 2007/01/14 08:03:30 fish
// correct minor (benign(?)) bug in LCS_QueryIPAssists, fix HHCLC011I and related deug msgs in LCS_PortThread to display IP address in correct byte-order.
//
// Revision 1.60 2006/12/08 09:43:19 jj
// Add CVS message log
//
#include "hstdinc.h"
/* jbs 10/27/2007 added _SOLARIS_ */
#if !defined(__SOLARIS__)
#include "hercules.h"
#include "ctcadpt.h"
#include "tuntap.h"
#include "hercifc.h"
#include "opcode.h"
#include "herc_getopt.h"
#if defined(OPTION_W32_CTCI)
#include "tt32api.h"
#endif
//-----------------------------------------------------------------------------
// Debugging...
//#define NO_LCS_OPTIMIZE // #undef for Release, #define while testing
#if !defined( DEBUG) && !defined( _DEBUG ) // only needed for Release builds
#ifdef NO_LCS_OPTIMIZE // for reliable breakpoints and instr stepping
#pragma optimize( "", off ) // disable optimizations for reliable breakpoints
#pragma warning( push ) // save current settings
#pragma warning( disable: 4748 ) // C4748: /GS can not ... because optimizations are disabled...
#endif // NO_LCS_OPTIMIZE
#endif // !defined( DEBUG) && !defined( _DEBUG )
#ifdef NO_LCS_OPTIMIZE
#undef ASSERT
#undef VERIFY
#ifdef _MSVC_
#define ASSERT(a) \
do \
{ \
if (!(a)) \
{ \
logmsg("HHCxx999W *** Assertion Failed! *** %s(%d); function: %s\n",__FILE__,__LINE__,__FUNCTION__); \
if (IsDebuggerPresent()) DebugBreak(); /* (break into debugger) */ \
} \
} \
while(0)
#else // ! _MSVC_
#define ASSERT(a) \
do \
{ \
if (!(a)) \
{ \
logmsg("HHCxx999W *** Assertion Failed! *** %s(%d)\n",__FILE__,__LINE__); \
} \
} \
while(0)
#endif // _MSVC_
#define VERIFY(a) ASSERT((a))
#endif // NO_LCS_OPTIMIZE
//-----------------------------------------------------------------------------
/* CCW Codes 0x03 & 0xC3 are immediate commands */
static BYTE CTC_Immed_Commands [256] =
{
/* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0, /* 00 */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 10 */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 20 */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 30 */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 40 */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 50 */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 60 */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 70 */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 80 */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 90 */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* A0 */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* B0 */
0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0, /* C0 */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* D0 */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* E0 */
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 /* F0 */
};
// ====================================================================
// Declarations
// ====================================================================
static void LCS_Startup ( PLCSDEV pLCSDEV, PLCSCMDHDR pCmdFrame );
static void LCS_Shutdown ( PLCSDEV pLCSDEV, PLCSCMDHDR pCmdFrame );
static void LCS_StartLan ( PLCSDEV pLCSDEV, PLCSCMDHDR pCmdFrame );
static void LCS_StopLan ( PLCSDEV pLCSDEV, PLCSCMDHDR pCmdFrame );
static void LCS_QueryIPAssists( PLCSDEV pLCSDEV, PLCSCMDHDR pCmdFrame );
static void LCS_LanStats ( PLCSDEV pLCSDEV, PLCSCMDHDR pCmdFrame );
static void LCS_DefaultCmdProc( PLCSDEV pLCSDEV, PLCSCMDHDR pCmdFrame );
static void* LCS_PortThread( PLCSPORT pLCSPORT );
static int LCS_EnqueueEthFrame( PLCSDEV pLCSDEV, BYTE bPort,
BYTE* pData, size_t iSize );
static void* LCS_InitReplyFrame( PLCSDEV pLCSDEV,
size_t iSize, PLCSCMDHDR pCmdFrame );
static int BuildOAT( char* pszOATName, PLCSBLK pLCSBLK );
static char* ReadOAT( char* pszOATName, FILE* fp, char* pszBuff );
static int ParseArgs( DEVBLK* pDEVBLK, PLCSBLK pLCSBLK,
int argc, char** argv );
// ====================================================================
// find_group_device
// ====================================================================
static DEVBLK * find_group_device(DEVGRP *group, U16 devnum)
{
int i;
for(i = 0; i < group->acount; i++)
if( group->memdev[i]->devnum == devnum )
return group->memdev[i];
return NULL;
}
// ====================================================================
// LCS_Init
// ====================================================================
int LCS_Init( DEVBLK* pDEVBLK, int argc, char *argv[] )
{
PLCSBLK pLCSBLK;
PLCSDEV pLCSDev;
int i;
struct in_addr addr; // Work area for addresses
pDEVBLK->devtype = 0x3088;
// Return when an existing group has been joined but is still incomplete
if(!group_device(pDEVBLK, 0) && pDEVBLK->group)
return 0;
// We need to create a group, and as such determine the number of devices
if(!pDEVBLK->group)
{
// Housekeeping
pLCSBLK = malloc( sizeof( LCSBLK ) );
if( !pLCSBLK )
{
logmsg( _("HHCLC001E %4.4X unable to allocate LCSBLK\n"),
pDEVBLK->devnum );
return -1;
}
memset( pLCSBLK, 0, sizeof( LCSBLK ) );
for( i = 0; i < LCS_MAX_PORTS; i++ )
{
memset( &pLCSBLK->Port[i], 0, sizeof ( LCSPORT ) );
pLCSBLK->Port[i].bPort = i;
pLCSBLK->Port[i].pLCSBLK = pLCSBLK;
// Initialize locking and event mechanisms
initialize_lock( &pLCSBLK->Port[i].Lock );
initialize_lock( &pLCSBLK->Port[i].EventLock );
initialize_condition( &pLCSBLK->Port[i].Event );
}
// Parse configuration file statement
if( ParseArgs( pDEVBLK, pLCSBLK, argc, (char**)argv ) != 0 )
{
free( pLCSBLK );
pLCSBLK = NULL;
return -1;
}
if( pLCSBLK->pszOATFilename )
{
// If an OAT file was specified, Parse it and build the
// OAT table.
if( BuildOAT( pLCSBLK->pszOATFilename, pLCSBLK ) != 0 )
{
free( pLCSBLK );
pLCSBLK = NULL;
return -1;
}
}
else
{
// Otherwise, build an OAT based on the address specified
// in the config file with an assumption of IP mode.
pLCSBLK->pDevices = malloc( sizeof( LCSDEV ) );
memset( pLCSBLK->pDevices, 0, sizeof( LCSDEV ) );
if( pLCSBLK->pszIPAddress )
inet_aton( pLCSBLK->pszIPAddress, &addr );
pLCSBLK->pDevices->sAddr = pDEVBLK->devnum;
pLCSBLK->pDevices->bMode = LCSDEV_MODE_IP;
pLCSBLK->pDevices->bPort = 0;
pLCSBLK->pDevices->bType = 0;
pLCSBLK->pDevices->lIPAddress = addr.s_addr; // (network byte order)
pLCSBLK->pDevices->pszIPAddress = pLCSBLK->pszIPAddress;
pLCSBLK->pDevices->pNext = NULL;
pLCSBLK->icDevices = 2;
}
// Now we must create the group
if(!group_device(pDEVBLK, pLCSBLK->icDevices))
{
pDEVBLK->group->grp_data = pLCSBLK;
return 0;
}
else
pDEVBLK->group->grp_data = pLCSBLK;
}
else
pLCSBLK = pDEVBLK->group->grp_data;
// When this code is reached the last devblk has been allocated...
//
// Now build the LCSDEV's.
// If an OAT is specified, the addresses that were specified in the
// hercules.cnf file must match those that are specified in the OAT.
for( pLCSDev = pLCSBLK->pDevices; pLCSDev; pLCSDev = pLCSDev->pNext )
{
pLCSDev->pDEVBLK[0] = find_group_device(pDEVBLK->group, pLCSDev->sAddr);
if( !pLCSDev->pDEVBLK[0] )
{
logmsg(D_("HHCLC040E %4.4X LCSDEV %4.4X not in configuration\n"),
pDEVBLK->group->memdev[0]->devnum, pLCSDev->sAddr );
return -1;
}
// Establish SENSE ID and Command Information Word data.
SetSIDInfo( pLCSDev->pDEVBLK[0], 0x3088, 0x60, 0x3088, 0x01 );
// SetCIWInfo( pLCSDev->pDEVBLK[0], 0, 0, 0x72, 0x0080 );
// SetCIWInfo( pLCSDev->pDEVBLK[0], 1, 1, 0x83, 0x0004 );
// SetCIWInfo( pLCSDev->pDEVBLK[0], 2, 2, 0x82, 0x0040 );
pLCSDev->pDEVBLK[0]->ctctype = CTC_LCS;
pLCSDev->pDEVBLK[0]->ctcxmode = 1;
pLCSDev->pDEVBLK[0]->dev_data = pLCSDev;
pLCSDev->pLCSBLK = pLCSBLK;
strcpy( pLCSDev->pDEVBLK[0]->filename, pLCSBLK->pszTUNDevice );
// If this is an IP Passthru address, we need a write address
if( pLCSDev->bMode == LCSDEV_MODE_IP )
{
pLCSDev->pDEVBLK[1] = find_group_device(pDEVBLK->group, pLCSDev->sAddr^1);
if( !pLCSDev->pDEVBLK[1] )
{
logmsg(D_("HHCLC040E %4.4X LCSDEV %4.4X not in configuration\n"),
pDEVBLK->group->memdev[0]->devnum, pLCSDev->sAddr^1 );
return -1;
}
// Establish SENSE ID and Command Information Word data.
SetSIDInfo( pLCSDev->pDEVBLK[1], 0x3088, 0x60, 0x3088, 0x01 );
// SetCIWInfo( pLCSDev->pDEVBLK[1], 0, 0, 0x72, 0x0080 );
// SetCIWInfo( pLCSDev->pDEVBLK[1], 1, 1, 0x83, 0x0004 );
// SetCIWInfo( pLCSDev->pDEVBLK[1], 2, 2, 0x82, 0x0040 );
pLCSDev->pDEVBLK[1]->ctctype = CTC_LCS;
pLCSDev->pDEVBLK[1]->ctcxmode = 1;
pLCSDev->pDEVBLK[1]->dev_data = pLCSDev;
strcpy( pLCSDev->pDEVBLK[1]->filename, pLCSBLK->pszTUNDevice );
}
// Indicate that the DEVBLK(s) have been create sucessfully
pLCSDev->fCreated = 1;
// Initialize locking and event mechanisms
initialize_lock( &pLCSDev->Lock );
initialize_lock( &pLCSDev->EventLock );
initialize_condition( &pLCSDev->Event );
// Create the TAP interface (if not already created by a
// previous pass. More than one interface can exist on a port.
if( !pLCSBLK->Port[pLCSDev->bPort].fCreated )
{
int rc;
rc = TUNTAP_CreateInterface( pLCSBLK->pszTUNDevice,
IFF_TAP | IFF_NO_PI,
&pLCSBLK->Port[pLCSDev->bPort].fd,
pLCSBLK->Port[pLCSDev->bPort].szNetDevName );
logmsg(_("HHCLC073I %4.4X: TAP device %s opened\n"),
pLCSDev->pDEVBLK[0]->devnum,
pLCSBLK->Port[pLCSDev->bPort].szNetDevName);
#if defined(OPTION_W32_CTCI)
// Set the specified driver/dll i/o buffer sizes..
{
struct tt32ctl tt32ctl;
memset( &tt32ctl, 0, sizeof(tt32ctl) );
strlcpy( tt32ctl.tt32ctl_name, pLCSBLK->Port[pLCSDev->bPort].szNetDevName, sizeof(tt32ctl.tt32ctl_name) );
tt32ctl.tt32ctl_devbuffsize = pLCSBLK->iKernBuff;
if( TUNTAP_IOCtl( pLCSBLK->Port[pLCSDev->bPort].fd, TT32SDEVBUFF, (char*)&tt32ctl ) != 0 )
{
logmsg( _("HHCLC074W TT32SDEVBUFF failed for device %s: %s.\n"),
pLCSBLK->Port[pLCSDev->bPort].szNetDevName, strerror( errno ) );
}
tt32ctl.tt32ctl_iobuffsize = pLCSBLK->iIOBuff;
if( TUNTAP_IOCtl( pLCSBLK->Port[pLCSDev->bPort].fd, TT32SIOBUFF, (char*)&tt32ctl ) != 0 )
{
logmsg( _("HHCLC075W TT32SIOBUFF failed for device %s: %s.\n"),
pLCSBLK->Port[pLCSDev->bPort].szNetDevName, strerror( errno ) );
}
}
#endif
// Indicate that the port is used.
pLCSBLK->Port[pLCSDev->bPort].fUsed = 1;
pLCSBLK->Port[pLCSDev->bPort].fCreated = 1;
create_thread( &pLCSBLK->Port[pLCSDev->bPort].tid,
JOINABLE, LCS_PortThread,
&pLCSBLK->Port[pLCSDev->bPort],
"LCS_PortThread" );
/* Identify the thread ID with the devices on which they are active */
pLCSDev->pDEVBLK[0]->tid = pLCSBLK->Port[pLCSDev->bPort].tid;
if (pLCSDev->pDEVBLK[1])
pLCSDev->pDEVBLK[1]->tid = pLCSBLK->Port[pLCSDev->bPort].tid;
}
// Add these devices to the ports device list.
pLCSBLK->Port[pLCSDev->bPort].icDevices++;
pLCSDev->pDEVBLK[0]->fd = pLCSBLK->Port[pLCSDev->bPort].fd;
if( pLCSDev->pDEVBLK[1] )
pLCSDev->pDEVBLK[1]->fd = pLCSBLK->Port[pLCSDev->bPort].fd;
}
return 0;
}
// ====================================================================
// LCS_ExecuteCCW
// ====================================================================
void LCS_ExecuteCCW( DEVBLK* pDEVBLK, BYTE bCode,
BYTE bFlags, BYTE bChained,
U16 sCount, BYTE bPrevCode,
int iCCWSeq, BYTE* pIOBuf,
BYTE* pMore, BYTE* pUnitStat,
U16* pResidual )
{
int iNum; // Number of bytes to move
BYTE bOpCode; // CCW opcode with modifier
// bits masked off
UNREFERENCED( bFlags );
UNREFERENCED( bChained );
UNREFERENCED( bPrevCode );
UNREFERENCED( iCCWSeq );
// Intervention required if the device file is not open
if( pDEVBLK->fd < 0 &&
!IS_CCW_SENSE( bCode ) &&
!IS_CCW_CONTROL( bCode ) )
{
pDEVBLK->sense[0] = SENSE_IR;
*pUnitStat = CSW_CE | CSW_DE | CSW_UC;
return;
}
// Mask off the modifier bits in the CCW bOpCode
if( ( bCode & 0x07 ) == 0x07 )
bOpCode = 0x07;
else if( ( bCode & 0x03 ) == 0x02 )
bOpCode = 0x02;
else if( ( bCode & 0x0F ) == 0x0C )
bOpCode = 0x0C;
else if( ( bCode & 0x03 ) == 0x01 )
bOpCode = pDEVBLK->ctcxmode ? ( bCode & 0x83 ) : 0x01;
else if( ( bCode & 0x1F ) == 0x14 )
bOpCode = 0x14;
else if( ( bCode & 0x47 ) == 0x03 )
bOpCode = 0x03;
else if( ( bCode & 0xC7 ) == 0x43 )
bOpCode = 0x43;
#if 0
// Special case for LCS CIW's
else if( ( bCode == 72 || bCode == 82 || bCode == 83 ) )
bOpCode == bCode;
#endif
else
bOpCode = bCode;
// Process depending on CCW bOpCode
switch (bOpCode)
{
case 0x01: // 0MMMMM01 WRITE
//------------------------------------------------------------
// WRITE
//------------------------------------------------------------
// Return normal status if CCW count is zero
if( sCount == 0 )
{
*pUnitStat = CSW_CE | CSW_DE;
break;
}
LCS_Write( pDEVBLK, sCount, pIOBuf, pUnitStat, pResidual );
break;
case 0x81: // 1MMMMM01 WEOF
//------------------------------------------------------------
// WRITE EOF
//------------------------------------------------------------
// Return normal status
*pUnitStat = CSW_CE | CSW_DE;
break;
case 0x02: // MMMMMM10 READ
case 0x0C: // MMMM1100 RDBACK
// -----------------------------------------------------------
// READ & READ BACKWARDS
// -----------------------------------------------------------
// Read data and set unit status and residual byte count
LCS_Read( pDEVBLK, sCount, pIOBuf, pUnitStat, pResidual, pMore );
break;
case 0x07: // MMMMM111 CTL
// -----------------------------------------------------------
// CONTROL
// -----------------------------------------------------------
*pUnitStat = CSW_CE | CSW_DE;
break;
case 0x03: // M0MMM011 NOP
// -----------------------------------------------------------
// CONTROL NO-OPERATON
// -----------------------------------------------------------
*pUnitStat = CSW_CE | CSW_DE;
break;
case 0x43: // 00XXX011 SBM
// -----------------------------------------------------------
// SET BASIC MODE
// -----------------------------------------------------------
// Command reject if in basic mode
if( pDEVBLK->ctcxmode == 0 )
{
pDEVBLK->sense[0] = SENSE_CR;
*pUnitStat = CSW_CE | CSW_DE | CSW_UC;
break;
}
// Reset extended mode and return normal status
pDEVBLK->ctcxmode = 0;
*pResidual = 0;
*pUnitStat = CSW_CE | CSW_DE;
break;
case 0xC3: // 11000011 SEM
// -----------------------------------------------------------
// SET EXTENDED MODE
// -----------------------------------------------------------
pDEVBLK->ctcxmode = 1;
*pResidual = 0;
*pUnitStat = CSW_CE | CSW_DE;
break;
case 0xE3: // 11100011
// -----------------------------------------------------------
// PREPARE (PREP)
// -----------------------------------------------------------
*pUnitStat = CSW_CE | CSW_DE;
break;
case 0x14: // XXX10100 SCB
// -----------------------------------------------------------
// SENSE COMMAND BYTE
// -----------------------------------------------------------
*pUnitStat = CSW_CE | CSW_DE;
break;
case 0x04: // 00000100 SENSE
// -----------------------------------------------------------
// SENSE
// -----------------------------------------------------------
// Command reject if in basic mode
if( pDEVBLK->ctcxmode == 0 )
{
pDEVBLK->sense[0] = SENSE_CR;
*pUnitStat = CSW_CE | CSW_DE | CSW_UC;
break;
}
// Calculate residual byte count
iNum = ( sCount < pDEVBLK->numsense ) ?
sCount : pDEVBLK->numsense;
*pResidual = sCount - iNum;
if( sCount < pDEVBLK->numsense )
*pMore = 1;
// Copy device sense bytes to channel I/O buffer
memcpy( pIOBuf, pDEVBLK->sense, iNum );
// Clear the device sense bytes
memset( pDEVBLK->sense, 0, sizeof( pDEVBLK->sense ) );
// Return unit status
*pUnitStat = CSW_CE | CSW_DE;
break;
case 0xE4: // 11100100 SID
// -----------------------------------------------------------
// SENSE ID
// -----------------------------------------------------------
// Calculate residual byte count
iNum = ( sCount < pDEVBLK->numdevid ) ?
sCount : pDEVBLK->numdevid;
*pResidual = sCount - iNum;
if( sCount < pDEVBLK->numdevid )
*pMore = 1;
// Copy device identifier bytes to channel I/O buffer
memcpy( pIOBuf, pDEVBLK->devid, iNum );
// Return unit status
*pUnitStat = CSW_CE | CSW_DE;
break;
#if 0
case 0x72: // 0111010 RCD
// ------------------------------------------------------------
// READ CONFIGURATION DATA
// ------------------------------------------------------------
case 0x82: // 10000010 SID
// ------------------------------------------------------------
// SET INTERFACE IDENTIFER
// ------------------------------------------------------------
case 0x83: // 10000011 RID
// ------------------------------------------------------------
// READ NODE IDENTIFER
// ------------------------------------------------------------
LCS_SDC( pDEVBLK, bOpCode, sCount, pIOBuf,
pUnitStat, pResidual, pMore );
break;
#endif
default:
// ------------------------------------------------------------
// INVALID OPERATION
// ------------------------------------------------------------
// Set command reject sense byte, and unit check status
pDEVBLK->sense[0] = SENSE_CR;
*pUnitStat = CSW_CE | CSW_DE | CSW_UC;
}
}
// ====================================================================
// LCS_Close
// ====================================================================
int LCS_Close( DEVBLK* pDEVBLK )
{
PLCSDEV pLCSDEV;
PLCSBLK pLCSBLK;
PLCSPORT pLCSPORT;
if (!(pLCSDEV = (PLCSDEV)pDEVBLK->dev_data))
return 0; // (was incomplete group)
pLCSBLK = pLCSDEV->pLCSBLK;
pLCSPORT = &pLCSBLK->Port[pLCSDEV->bPort];
pLCSPORT->icDevices--;
// Is this the last device on the port?
if( !pLCSPORT->icDevices )
{
// PROGRAMMING NOTE: there's currently no way to interrupt
// the "LCS_PortThread"s TUNTAP_Read of the adapter. Thus
// we must simply wait for LCS_PortThread to eventually
// notice that we're doing a close (via our setting of the
// fCloseInProgress flag). Its TUNTAP_Read will eventually
// timeout after a few seconds (currently 5, which is dif-
// ferent than the CTC_READ_TIMEOUT_SECS timeout value the
// CTCI_Read function uses) and will then do the close of
// the adapter for us (TUNTAP_Close) so we don't have to.
// All we need to do is ask it to exit (via our setting of
// the fCloseInProgress flag) and then wait for it to exit
// (which, as stated, could take up to a max of 5 seconds).
// All of this is simply because it's poor form to close a
// device from one thread while another thread is reading
// from it. Attempting to do so could trip a race condition
// wherein the internal i/o buffers used to process the
// read request could have been freed (by the close call)
// by the time the read request eventually gets serviced.
if( pLCSPORT->fd >= 0 )
{
TID tid = pLCSPORT->tid;
obtain_lock( &pLCSPORT->EventLock );
{
pLCSPORT->fStarted = 0;
pLCSPORT->fCloseInProgress = 1;
signal_condition( &pLCSPORT->Event );
}
release_lock( &pLCSPORT->EventLock );
signal_thread( tid, SIGUSR2 );
join_thread( tid, NULL );
detach_thread( tid );
}
if( pLCSDEV->pDEVBLK[0] && pLCSDEV->pDEVBLK[0]->fd >= 0 )
pLCSDEV->pDEVBLK[0]->fd = -1;
if( pLCSDEV->pDEVBLK[1] && pLCSDEV->pDEVBLK[1]->fd >= 0 )
pLCSDEV->pDEVBLK[1]->fd = -1;
}
// Housekeeping
if( pLCSDEV->pDEVBLK[0] == pDEVBLK )
pLCSDEV->pDEVBLK[0] = NULL;
if( pLCSDEV->pDEVBLK[1] == pDEVBLK )
pLCSDEV->pDEVBLK[1] = NULL;
if( !pLCSDEV->pDEVBLK[0] &&
!pLCSDEV->pDEVBLK[1] )
{
// Remove this LCS Device from the chain...
PLCSDEV pCurrLCSDev = NULL;
PLCSDEV* ppPrevLCSDev = &pLCSBLK->pDevices;
for( pCurrLCSDev = pLCSBLK->pDevices; pCurrLCSDev; pCurrLCSDev = pCurrLCSDev->pNext )
{
if( pCurrLCSDev == pLCSDEV )
{
*ppPrevLCSDev = pCurrLCSDev->pNext;
if( pCurrLCSDev->pszIPAddress )
{
free( pCurrLCSDev->pszIPAddress );
pCurrLCSDev->pszIPAddress = NULL;
}
free( pLCSDEV );
pLCSDEV = NULL;
break;
}
ppPrevLCSDev = &pCurrLCSDev->pNext;
}
}
if( !pLCSBLK->pDevices )
{
if( pLCSBLK->pszTUNDevice ) { free( pLCSBLK->pszTUNDevice ); pLCSBLK->pszTUNDevice = NULL; }
if( pLCSBLK->pszOATFilename ) { free( pLCSBLK->pszOATFilename ); pLCSBLK->pszOATFilename = NULL; }
// if( pLCSBLK->pszIPAddress ) { free( pLCSBLK->pszIPAddress ); pLCSBLK->pszIPAddress = NULL; }
if( pLCSBLK->pszMACAddress ) { free( pLCSBLK->pszMACAddress ); pLCSBLK->pszMACAddress = NULL; }
if( pLCSBLK->pszOATFilename )
{
if( pLCSBLK->pszIPAddress )
{
free( pLCSBLK->pszIPAddress );
pLCSBLK->pszIPAddress = NULL;
}
}
free( pLCSBLK );
pLCSBLK = NULL;
}
pDEVBLK->dev_data = NULL;
return 0;
}
// ====================================================================
// LCS_Query
// ====================================================================
void LCS_Query( DEVBLK* pDEVBLK, char** ppszClass,
int iBufLen, char* pBuffer )
{
char *sType[] = { "", " Pri", " Sec" };
LCSDEV* pLCSDEV;
BEGIN_DEVICE_CLASS_QUERY( "CTCA", pDEVBLK, ppszClass, iBufLen, pBuffer );
pLCSDEV = (LCSDEV*) pDEVBLK->dev_data;
if(!pLCSDEV)
{
strlcpy(pBuffer,"*Uninitialized",iBufLen);
return;
}
snprintf( pBuffer, iBufLen, "LCS Port %2.2X %s%s (%s)%s",
pLCSDEV->bPort,
pLCSDEV->bMode == LCSDEV_MODE_IP ? "IP" : "SNA",
sType[pLCSDEV->bType],
pLCSDEV->pLCSBLK->Port[pLCSDEV->bPort].szNetDevName,
pLCSDEV->pLCSBLK->fDebug ? " -d" : "" );
}
// ====================================================================
// LCS_Read
// ====================================================================
// The guest o/s is issuing a Read CCW for our LCS device. Return to
// it all available LCS Frames that we have buffered up in our buffer.
// --------------------------------------------------------------------
void LCS_Read( DEVBLK* pDEVBLK, U16 sCount,
BYTE* pIOBuf, BYTE* pUnitStat,
U16* pResidual, BYTE* pMore )
{
PLCSHDR pLCSHdr;
PLCSDEV pLCSDEV = (PLCSDEV)pDEVBLK->dev_data;
size_t iLength = 0;
int rc = 0;
// FIXME: we currently don't support data-chaining but
// probably should if real LCS devices do (I was unable
// to determine whether they do or not). -- Fish
for (;;)
{
// Wait for some LCS Frames to arrive in our buffer...
obtain_lock( &pLCSDEV->Lock );
if( !( pLCSDEV->fDataPending || pLCSDEV->fReplyPending ) )
{
struct timespec waittime;
struct timeval now;
release_lock( &pLCSDEV->Lock );
// Wait 5 seconds then check for channel conditions
gettimeofday( &now, NULL );
waittime.tv_sec = now.tv_sec + CTC_READ_TIMEOUT_SECS;
waittime.tv_nsec = now.tv_usec * 1000;
obtain_lock( &pLCSDEV->EventLock );
rc = timed_wait_condition( &pLCSDEV->Event,
&pLCSDEV->EventLock,
&waittime );
release_lock( &pLCSDEV->EventLock );
// If we didn't receive any, keep waiting...
if( rc == ETIMEDOUT || rc == EINTR )
{
// check for halt condition
if( pDEVBLK->scsw.flag2 & SCSW2_FC_HALT ||
pDEVBLK->scsw.flag2 & SCSW2_FC_CLEAR )
{
if( pDEVBLK->ccwtrace || pDEVBLK->ccwstep )
logmsg( _("HHCLC002I %4.4X: Halt or Clear Recognized\n"),
pDEVBLK->devnum );
*pUnitStat = CSW_CE | CSW_DE;
*pResidual = sCount;
return;
}
continue; // (keep waiting)
}
// We received some LCS Frames...
obtain_lock( &pLCSDEV->Lock );
}
// Point to the end of all buffered LCS Frames...
// (where the next Frame *would* go if there was one)
pLCSHdr = (PLCSHDR)( pLCSDEV->bFrameBuffer +
pLCSDEV->iFrameOffset );
// Mark the end of this batch of LCS Frames by setting
// the "offset to NEXT frame" LCS Header field to zero.
// (a zero "next Frame offset" is like an "EOF" flag)
STORE_HW( pLCSHdr->hwOffset, 0x0000 );
// Calculate how much data we're going to be giving them.
// Since 'iFrameOffset' points to the next available LCS
// Frame slot in our buffer, the total amount of LCS Frame
// data we have is exactly that amount. We give them two
// extra bytes however so that they can optionally chase
// the "hwOffset" field in each LCS Frame's LCS Header to
// eventually reach our zero hwOffset "EOF" flag).
iLength = pLCSDEV->iFrameOffset + sizeof(pLCSHdr->hwOffset);
// (calculate residual and set memcpy amount)
// FIXME: we currently don't support data-chaining but
// probably should if real LCS devices do (I was unable
// to determine whether they do or not). -- Fish
if( sCount < iLength )
{
*pMore = 1;
*pResidual = 0;
iLength = sCount;
// PROGRAMMING NOTE: As a result of the caller asking
// for less data than we actually have available, the
// remainder of their unread data they didn't ask for
// will end up being silently discarded. Refer to the
// other NOTEs and FIXME's sprinkled throughout this
// function...
}
else
{
*pMore = 0;
*pResidual -= iLength;
}
*pUnitStat = CSW_CE | CSW_DE;
memcpy( pIOBuf, pLCSDEV->bFrameBuffer, iLength );
// Trace the i/o if requested...
if( pDEVBLK->ccwtrace || pDEVBLK->ccwstep )
{
logmsg( _("HHCLC003I %4.4X: LCS Read:\n"),
pDEVBLK->devnum );
packet_trace( pIOBuf, iLength );
}
// Reset frame buffer to empty...
// PROGRAMMING NOTE: even though not all available data
// may have been read by the guest, we don't currently
// support data-chaining. Thus any unread data is always
// discarded by resetting both of the iFrameOffset and
// fDataPending fields to 0 so that the next read always
// grabs a new batch of LCS Frames starting at the very
// beginning of our frame buffer again. (I was unable
// to determine whether real LCS devices support data-
// chaining or not, but if they do we should fix this).
pLCSDEV->iFrameOffset = 0;
pLCSDEV->fReplyPending = 0;
pLCSDEV->fDataPending = 0;
release_lock( &pLCSDEV->Lock );
return;
}
}
// ====================================================================
// LCS_Write
// ====================================================================
void LCS_Write( DEVBLK* pDEVBLK, U16 sCount,
BYTE* pIOBuf, BYTE* pUnitStat,
U16* pResidual )
{
PLCSDEV pLCSDEV = (PLCSDEV)pDEVBLK->dev_data;
PLCSHDR pLCSHDR = NULL;
PLCSCMDHDR pCmdFrame = NULL;
PLCSETHFRM pLCSEthFrame = NULL;
PETHFRM pEthFrame = NULL;
U16 iOffset = 0;
U16 iPrevOffset = 0;
U16 iLength = 0;
U16 iEthLen = 0;
UNREFERENCED( sCount );