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ctc_ctci.c
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ctc_ctci.c
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// ====================================================================
// Hercules IP Channel-to-Channel Support (CTCI)
// ====================================================================
//
// Copyright (C) Copyright James A. Pierson, 2002-2006
// (C) Copyright "Fish" (David B. Trout), 2002-2006
// (C) Copyright Roger Bowler, 2000-2006
//
// linux 2.4 modifications (c) Copyright Fritz Elfert, 2001-2006
//
#include "hstdinc.h"
#include "hercules.h"
#include "ctcadpt.h"
#include "tuntap.h"
#include "hercifc.h"
#include "opcode.h"
/* getopt dynamic linking kludge */
#include "herc_getopt.h"
#if defined(OPTION_W32_CTCI)
#include "tt32api.h"
#endif
/*-------------------------------------------------------------------*/
/* Ivan Warren 20040227 */
/* This table is used by channel.c to determine if a CCW code is an */
/* immediate command or not */
/* The tape is addressed in the DEVHND structure as 'DEVIMM immed' */
/* 0 : Command is NOT an immediate command */
/* 1 : Command is an immediate command */
/* Note : An immediate command is defined as a command which returns */
/* CE (channel end) during initialisation (that is, no data is */
/* actually transfered. In this case, IL is not indicated for a CCW */
/* Format 0 or for a CCW Format 1 when IL Suppression Mode is in */
/* effect */
/*-------------------------------------------------------------------*/
static BYTE CTCI_Immed_Commands[256]=
{ 0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
// ====================================================================
// Declarations
// ====================================================================
static void* CTCI_ReadThread( PCTCBLK pCTCBLK );
static int CTCI_EnqueueIPFrame( DEVBLK* pDEVBLK,
BYTE* pData, size_t iSize );
static int ParseArgs( DEVBLK* pDEVBLK, PCTCBLK pCTCBLK,
int argc, char** argv );
// --------------------------------------------------------------------
// Device Handler Information Block
// --------------------------------------------------------------------
DEVHND ctci_device_hndinfo =
{
&CTCI_Init, /* Device Initialisation */
&CTCI_ExecuteCCW, /* Device CCW execute */
&CTCI_Close, /* Device Close */
&CTCI_Query, /* Device Query */
NULL, /* Device Start channel pgm */
NULL, /* Device End channel pgm */
NULL, /* Device Resume channel pgm */
NULL, /* Device Suspend channel pgm */
NULL, /* Device Read */
NULL, /* Device Write */
NULL, /* Device Query used */
NULL, /* Device Reserve */
NULL, /* Device Release */
NULL, /* Device Attention */
CTCI_Immed_Commands, /* Immediate CCW Codes */
NULL, /* Signal Adapter Input */
NULL, /* Signal Adapter Output */
NULL, /* Hercules suspend */
NULL /* Hercules resume */
};
// ====================================================================
//
// ====================================================================
//
// CTCI_Init
//
#define CTC_DEVICES_IN_GROUP 2 // a read and write device
int CTCI_Init( DEVBLK* pDEVBLK, int argc, char *argv[] )
{
PCTCBLK pWrkCTCBLK = NULL; // Working CTCBLK
PCTCBLK pDevCTCBLK = NULL; // Device CTCBLK
int rc = 0; // Return code
int nIFType; // Interface type
int nIFFlags; // Interface flags
char thread_name[32]; // CTCI_ReadThread
nIFType = // Interface type
0
| IFF_TUN // ("TUN", not "tap")
| IFF_NO_PI // (no packet info)
;
nIFFlags = // Interface flags
0
| IFF_UP // (interface is being enabled)
| IFF_BROADCAST // (interface broadcast addr is valid)
;
#if defined( TUNTAP_IFF_RUNNING_NEEDED )
nIFFlags |= // ADDITIONAL Interface flags
0
| IFF_RUNNING // (interface is ALSO operational)
;
#endif /* defined( TUNTAP_IFF_RUNNING_NEEDED ) */
pDEVBLK->devtype = 0x3088;
// CTC is a group device
if(!group_device(pDEVBLK, CTC_DEVICES_IN_GROUP))
return 0;
// Housekeeping
pWrkCTCBLK = malloc( sizeof( CTCBLK ) );
if( !pWrkCTCBLK )
{
logmsg( _("HHCCT037E %4.4X: Unable to allocate CTCBLK\n"),
pDEVBLK->devnum );
return -1;
}
memset( pWrkCTCBLK, 0, sizeof( CTCBLK ) );
// Parse configuration file statement
if( ParseArgs( pDEVBLK, pWrkCTCBLK, argc, (char**)argv ) != 0 )
{
free( pWrkCTCBLK );
pWrkCTCBLK = NULL;
return -1;
}
// Allocate the device CTCBLK and copy parsed information.
pDevCTCBLK = malloc( sizeof( CTCBLK ) );
if( !pDevCTCBLK )
{
logmsg( _("HHCCT038E %4.4X: Unable to allocate CTCBLK\n"),
pDEVBLK->devnum );
free( pWrkCTCBLK );
pWrkCTCBLK = NULL;
return -1;
}
memcpy( pDevCTCBLK, pWrkCTCBLK, sizeof( CTCBLK ) );
// New format has only one device statement for both addresses
// We need to dynamically allocate the read device block
pDevCTCBLK->pDEVBLK[0] = pDEVBLK->group->memdev[0];
pDevCTCBLK->pDEVBLK[1] = pDEVBLK->group->memdev[1];
pDevCTCBLK->pDEVBLK[0]->dev_data = pDevCTCBLK;
pDevCTCBLK->pDEVBLK[1]->dev_data = pDevCTCBLK;
SetSIDInfo( pDevCTCBLK->pDEVBLK[0], 0x3088, 0x08, 0x3088, 0x01 );
SetSIDInfo( pDevCTCBLK->pDEVBLK[1], 0x3088, 0x08, 0x3088, 0x01 );
pDevCTCBLK->pDEVBLK[0]->ctctype = CTC_CTCI;
pDevCTCBLK->pDEVBLK[0]->ctcxmode = 1;
pDevCTCBLK->pDEVBLK[1]->ctctype = CTC_CTCI;
pDevCTCBLK->pDEVBLK[1]->ctcxmode = 1;
pDevCTCBLK->sMTU = atoi( pDevCTCBLK->szMTU );
pDevCTCBLK->iMaxFrameBufferSize = pDevCTCBLK->sMTU + sizeof( IP4FRM );
initialize_lock( &pDevCTCBLK->Lock );
initialize_lock( &pDevCTCBLK->EventLock );
initialize_condition( &pDevCTCBLK->Event );
// Give both Herc devices a reasonable name...
strlcpy( pDevCTCBLK->pDEVBLK[0]->filename,
pDevCTCBLK->szTUNCharName,
sizeof( pDevCTCBLK->pDEVBLK[0]->filename ) );
strlcpy( pDevCTCBLK->pDEVBLK[1]->filename,
pDevCTCBLK->szTUNCharName,
sizeof( pDevCTCBLK->pDEVBLK[1]->filename ) );
rc = TUNTAP_CreateInterface( pDevCTCBLK->szTUNCharName,
IFF_TUN | IFF_NO_PI,
&pDevCTCBLK->fd,
pDevCTCBLK->szTUNDevName );
if( rc < 0 )
{
free( pWrkCTCBLK );
pWrkCTCBLK = NULL;
return -1;
}
else
{
logmsg(_("HHCCT073I %4.4X: TUN device %s opened\n"),
pDevCTCBLK->pDEVBLK[0]->devnum,
pDevCTCBLK->szTUNDevName);
}
#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, pDevCTCBLK->szTUNDevName, sizeof(tt32ctl.tt32ctl_name) );
tt32ctl.tt32ctl_devbuffsize = pDevCTCBLK->iKernBuff;
if( TUNTAP_IOCtl( pDevCTCBLK->fd, TT32SDEVBUFF, (char*)&tt32ctl ) != 0 )
{
logmsg( _("HHCCT074W TT32SDEVBUFF failed for device %s: %s.\n"),
pDevCTCBLK->szTUNDevName, strerror( errno ) );
}
tt32ctl.tt32ctl_iobuffsize = pDevCTCBLK->iIOBuff;
if( TUNTAP_IOCtl( pDevCTCBLK->fd, TT32SIOBUFF, (char*)&tt32ctl ) != 0 )
{
logmsg( _("HHCCT075W TT32SIOBUFF failed for device %s: %s.\n"),
pDevCTCBLK->szTUNDevName, strerror( errno ) );
}
}
#endif
#ifdef OPTION_TUNTAP_CLRIPADDR
VERIFY( TUNTAP_ClrIPAddr ( pDevCTCBLK->szTUNDevName ) == 0 );
#endif
#ifdef OPTION_TUNTAP_SETMACADDR
if( !pDevCTCBLK->szMACAddress[0] ) // (if MAC address unspecified)
{
in_addr_t wrk_guest_ip_addr;
MAC wrk_guest_mac_addr;
if ((in_addr_t)-1 != (wrk_guest_ip_addr = inet_addr( pDevCTCBLK->szGuestIPAddr )))
{
build_herc_iface_mac ( wrk_guest_mac_addr, (const BYTE*) &wrk_guest_ip_addr );
snprintf
(
pDevCTCBLK->szMACAddress, sizeof( pDevCTCBLK->szMACAddress ),
"%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X"
,wrk_guest_mac_addr[0]
,wrk_guest_mac_addr[1]
,wrk_guest_mac_addr[2]
,wrk_guest_mac_addr[3]
,wrk_guest_mac_addr[4]
,wrk_guest_mac_addr[5]
);
}
}
TRACE
(
"** CTCI_Init: %4.4X (%s): IP \"%s\" --> default MAC \"%s\"\n"
,pDevCTCBLK->pDEVBLK[0]->devnum
,pDevCTCBLK->szTUNDevName
,pDevCTCBLK->szGuestIPAddr
,pDevCTCBLK->szMACAddress
);
VERIFY( TUNTAP_SetMACAddr ( pDevCTCBLK->szTUNDevName, pDevCTCBLK->szMACAddress ) == 0 );
#endif
VERIFY( TUNTAP_SetIPAddr ( pDevCTCBLK->szTUNDevName, pDevCTCBLK->szDriveIPAddr ) == 0 );
VERIFY( TUNTAP_SetDestAddr( pDevCTCBLK->szTUNDevName, pDevCTCBLK->szGuestIPAddr ) == 0 );
#ifdef OPTION_TUNTAP_SETNETMASK
VERIFY( TUNTAP_SetNetMask ( pDevCTCBLK->szTUNDevName, pDevCTCBLK->szNetMask ) == 0 );
#endif
VERIFY( TUNTAP_SetMTU ( pDevCTCBLK->szTUNDevName, pDevCTCBLK->szMTU ) == 0 );
VERIFY( TUNTAP_SetFlags ( pDevCTCBLK->szTUNDevName, nIFFlags ) == 0 );
// Copy the fd to make panel.c happy
pDevCTCBLK->pDEVBLK[0]->fd =
pDevCTCBLK->pDEVBLK[1]->fd = pDevCTCBLK->fd;
snprintf(thread_name,sizeof(thread_name),"CTCI %4.4X ReadThread",pDEVBLK->devnum);
thread_name[sizeof(thread_name)-1]=0;
create_thread( &pDevCTCBLK->tid, &sysblk.joinattr, CTCI_ReadThread, pDevCTCBLK, thread_name );
pDevCTCBLK->pDEVBLK[0]->tid = pDevCTCBLK->tid;
pDevCTCBLK->pDEVBLK[1]->tid = pDevCTCBLK->tid;
free( pWrkCTCBLK );
pWrkCTCBLK = NULL;
return 0;
}
//
// CTCI_ExecuteCCW
//
void CTCI_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;
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;
}
CTCI_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
CTCI_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;
default:
// ------------------------------------------------------------
// INVALID OPERATION
// ------------------------------------------------------------
// Set command reject sense byte, and unit check status
pDEVBLK->sense[0] = SENSE_CR;
*pUnitStat = CSW_CE | CSW_DE | CSW_UC;
}
}
// -------------------------------------------------------------------
// CTCI_Close
// -------------------------------------------------------------------
int CTCI_Close( DEVBLK* pDEVBLK )
{
/* DEVBLK* pDEVBLK2; */
PCTCBLK pCTCBLK = (PCTCBLK)pDEVBLK->dev_data;
// Close the device file (if not already closed)
if( pCTCBLK->fd >= 0 )
{
// PROGRAMMING NOTE: there's currently no way to interrupt
// the "CTCI_ReadThread"s TUNTAP_Read of the adapter. Thus
// we must simply wait for CTCI_ReadThread 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.
TID tid = pCTCBLK->tid;
pCTCBLK->fCloseInProgress = 1; // (ask read thread to exit)
signal_thread( tid, SIGUSR2 ); // (for non-Win32 platforms)
//FIXME signal_thread not working for non-MSVC platforms
#if defined(_MSVC_)
join_thread( tid, NULL ); // (wait for thread to end)
#endif
detach_thread( tid ); // (wait for thread to end)
}
pDEVBLK->fd = -1; // indicate we're now closed
return 0;
}
// -------------------------------------------------------------------
// CTCI_Query
// -------------------------------------------------------------------
void CTCI_Query( DEVBLK* pDEVBLK, char** ppszClass,
int iBufLen, char* pBuffer )
{
PCTCBLK pCTCBLK = (PCTCBLK)pDEVBLK->dev_data;
*ppszClass = "CTCA";
if(!pCTCBLK)
{
strlcpy(pBuffer,"*Uninitialized",iBufLen);
return;
}
snprintf( pBuffer, iBufLen, "CTCI %s/%s (%s)",
pCTCBLK->szGuestIPAddr,
pCTCBLK->szDriveIPAddr,
pCTCBLK->szTUNDevName );
}
// -------------------------------------------------------------------
// CTCI_Read
// -------------------------------------------------------------------
//
// Once an IP frame is received by the Read Thread, it is enqueued
// on the device frame buffer for presentation to the host program.
// The residual byte count is set to indicate the amount of the buffer
// which was not filled.
//
// Input:
// pDEVBLK A pointer to the CTC adapter device block
// sCount The I/O buffer length from the read CCW
// pIOBuf The I/O buffer from the read CCW
//
// Output:
// pUnitStat The CSW status (CE+DE or CE+DE+UC or CE+DE+UC+SM)
// pResidual The CSW residual byte count
// pMore Set to 1 if packet data exceeds CCW count
//
void CTCI_Read( DEVBLK* pDEVBLK, U16 sCount,
BYTE* pIOBuf, BYTE* pUnitStat,
U16* pResidual, BYTE* pMore )
{
PCTCBLK pCTCBLK = (PCTCBLK)pDEVBLK->dev_data;
PCTCIHDR pFrame = NULL;
size_t iLength = 0;
int rc = 0;
for ( ; ; )
{
obtain_lock( &pCTCBLK->Lock );
if( !pCTCBLK->fDataPending )
{
struct timespec waittime;
struct timeval now;
release_lock( &pCTCBLK->Lock );
gettimeofday( &now, NULL );
waittime.tv_sec = now.tv_sec + CTC_READ_TIMEOUT_SECS;
waittime.tv_nsec = now.tv_usec * 1000;
obtain_lock( &pCTCBLK->EventLock );
rc = timed_wait_condition( &pCTCBLK->Event,
&pCTCBLK->EventLock,
&waittime );
release_lock( &pCTCBLK->EventLock );
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( _("HHCCT040I %4.4X: Halt or Clear Recognized\n"),
pDEVBLK->devnum );
*pUnitStat = CSW_CE | CSW_DE;
*pResidual = sCount;
return;
}
continue;
}
obtain_lock( &pCTCBLK->Lock );
}
// Sanity check
if( pCTCBLK->iFrameOffset == 0 )
{
release_lock( &pCTCBLK->Lock );
continue;
}
// Fix-up frame pointer and terminate block
pFrame = (PCTCIHDR)( pCTCBLK->bFrameBuffer +
sizeof( CTCIHDR ) +
pCTCBLK->iFrameOffset );
STORE_HW( pFrame->hwOffset, 0x0000 );
iLength = pCTCBLK->iFrameOffset + sizeof( CTCIHDR ) + 2;
if( sCount < iLength )
{
*pMore = 1;
*pResidual = 0;
iLength = sCount;
}
else
{
*pMore = 0;
*pResidual -= iLength;
}
*pUnitStat = CSW_CE | CSW_DE;
memcpy( pIOBuf, pCTCBLK->bFrameBuffer, iLength );
if( pCTCBLK->fDebug )
{
logmsg( _("HHCCT041I %4.4X: CTC Received Frame (%d bytes):\n"),
pDEVBLK->devnum, iLength );
packet_trace( pCTCBLK->bFrameBuffer, iLength );
}
// Reset frame buffer
pCTCBLK->iFrameOffset = 0;
pCTCBLK->fDataPending = 0;
release_lock( &pCTCBLK->Lock );
return;
}
}
// -------------------------------------------------------------------
// CTCI_Write
// -------------------------------------------------------------------
void CTCI_Write( DEVBLK* pDEVBLK, U16 sCount,
BYTE* pIOBuf, BYTE* pUnitStat,
U16* pResidual )
{
PCTCBLK pCTCBLK = (PCTCBLK)pDEVBLK->dev_data;
PCTCIHDR pFrame; // -> Frame header
PCTCISEG pSegment; // -> Segment in buffer
U16 sOffset; // Offset of next frame
U16 sSegLen; // Current segment length
U16 sDataLen; // Length of IP Frame data
int iPos; // Offset into buffer
U16 i; // Array subscript
int rc; // Return code
BYTE szStackID[33]; // VSE IP stack identity
U32 iStackCmd; // VSE IP stack command
// Check that CCW count is sufficient to contain block header
if( sCount < sizeof( CTCIHDR ) )
{
logmsg( _("HHCCT042E %4.4X: Write CCW count %u is invalid\n"),
pDEVBLK->devnum, sCount );
pDEVBLK->sense[0] = SENSE_DC;
*pUnitStat = CSW_CE | CSW_DE | CSW_UC;
return;
}
// Fix-up frame pointer
pFrame = (PCTCIHDR)pIOBuf;
// Extract the frame length from the header
FETCH_HW( sOffset, pFrame->hwOffset );
// Check for special VSE TCP/IP stack command packet
if( sOffset == 0 && sCount == 40 )
{
// Extract the 32-byte stack identity string
for( i = 0;
i < sizeof( szStackID ) - 1 && i < sCount - 4;
i++)
szStackID[i] = guest_to_host( pIOBuf[i+4] );
szStackID[i] = '\0';
// Extract the stack command word
FETCH_FW( iStackCmd, *((FWORD*)&pIOBuf[36]) );
// Display stack command and discard the packet
logmsg( _("HHCCT043I %4.4X: Interface command: %s %8.8X\n"),
pDEVBLK->devnum, szStackID, iStackCmd );
*pUnitStat = CSW_CE | CSW_DE;
*pResidual = 0;
return;
}
// Check for special L/390 initialization packet
if( sOffset == 0 )
{
// Return normal status and discard the packet
*pUnitStat = CSW_CE | CSW_DE;
*pResidual = 0;
return;
}
#if 0
// Notes: It appears that TurboLinux has gotten sloppy in their
// ways. They are now giving us buffer sizes that are
// greater than the CCW count, but the segment size
// is within the count.
// Check that the frame offset is valid
if( sOffset < sizeof( CTCIHDR ) || sOffset > sCount )
{
logmsg( _("CTC101W %4.4X: Write buffer contains invalid "
"frame offset %u\n"),
pDEVBLK->devnum, sOffset );
pDEVBLK->sense[0] = SENSE_CR;
*pUnitStat = CSW_CE | CSW_DE | CSW_UC;
return;
}
#endif
// Adjust the residual byte count
*pResidual -= sizeof( CTCIHDR );
// Process each segment in the buffer
for( iPos = sizeof( CTCIHDR );
iPos < sOffset;
iPos += sSegLen )
{
// Check that the segment is fully contained within the block
if( iPos + sizeof( CTCISEG ) > sOffset )
{
logmsg( _("HHCCT044E %4.4X: Write buffer contains incomplete "
"segment header at offset %4.4X\n"),
pDEVBLK->devnum, iPos );
pDEVBLK->sense[0] = SENSE_DC;
*pUnitStat = CSW_CE | CSW_DE | CSW_UC;
return;
}
// Fix-up segment header in the I/O buffer
pSegment = (PCTCISEG)(pIOBuf + iPos);
// Extract the segment length from the segment header
FETCH_HW( sSegLen, pSegment->hwLength );
// Check that the segment length is valid
if( ( sSegLen < sizeof( CTCISEG ) ) ||
( iPos + sSegLen > sOffset ) ||
( iPos + sSegLen > sCount ) )
{
logmsg( _("HHCCT045E %4.4X: Write buffer contains invalid "
"segment length %u at offset %4.4X\n"),
pDEVBLK->devnum, sSegLen, iPos );
pDEVBLK->sense[0] = SENSE_DC;
*pUnitStat = CSW_CE | CSW_DE | CSW_UC;
return;
}
// Calculate length of IP frame data
sDataLen = sSegLen - sizeof( CTCISEG );
// Trace the IP packet before sending to TUN device
if( pCTCBLK->fDebug )
{
logmsg( _("HHCCT046I %4.4X: Sending packet to %s:\n"),
pDEVBLK->devnum, pCTCBLK->szTUNDevName );
packet_trace( pSegment->bData, sDataLen );
}
// Write the IP packet to the TUN/TAP interface
rc = TUNTAP_Write( pCTCBLK->fd, pSegment->bData, sDataLen );
if( rc < 0 )
{
logmsg( _("HHCCT047E %4.4X: Error writing to %s: %s\n"),
pDEVBLK->devnum, pCTCBLK->szTUNDevName,
strerror( errno ) );
pDEVBLK->sense[0] = SENSE_EC;
*pUnitStat = CSW_CE | CSW_DE | CSW_UC;
return;
}
// Adjust the residual byte count
*pResidual -= sSegLen;
// We are done if current segment satisfies CCW count
if( iPos + sSegLen == sCount )
{
*pResidual -= sSegLen;
*pUnitStat = CSW_CE | CSW_DE;
return;
}
}
// Set unit status and residual byte count
*pUnitStat = CSW_CE | CSW_DE;
*pResidual = 0;
}
// --------------------------------------------------------------------
// CTCI_ReadThread
// --------------------------------------------------------------------
//
// When an IP frame is received from the TUN/TAP interface, the frame
// is enqueued on the device frame buffer.
//
// The device frame buffer is a chain of blocks. The first 2 bytes of
// a block specify the offset in the buffer of the next block. The
// final block in indicated by an offset of 0x0000.
//
// Within each block, each IP frame is preceeded by a segment header.
// This segment header has a 2 byte length field that specifies the
// length of the segment (including the segment header), a 2 byte
// frame type field (always 0x0800 - IPv4), and a 2 byte reserved area
// followed by the actual frame data.
//
static void* CTCI_ReadThread( PCTCBLK pCTCBLK )
{
DEVBLK* pDEVBLK = pCTCBLK->pDEVBLK[0];
int iLength;
BYTE szBuff[2048];
// ZZ FIXME: Try to avoid race condition at startup with hercifc
SLEEP(10);
pCTCBLK->pid = getpid();
while( pCTCBLK->fd != -1 && !pCTCBLK->fCloseInProgress )
{
// Read frame from the TUN/TAP interface
iLength = TUNTAP_Read( pCTCBLK->fd, szBuff, sizeof(szBuff) );
// Check for error condition
if( iLength < 0 )
{
logmsg( _("HHCCT048E %4.4X: Error reading from %s: %s\n"),
pDEVBLK->devnum, pCTCBLK->szTUNDevName,
strerror( errno ) );
SLEEP(1); // (purposeful long delay)
continue;
}
if( iLength == 0 ) // (probably EINTR; ignore)
continue;
if( pCTCBLK->fDebug )
{
logmsg( _("HHCCT049I %4.4X: Received packet from %s (%d bytes):\n"),
pDEVBLK->devnum, pCTCBLK->szTUNDevName, iLength );
packet_trace( szBuff, iLength );
}
// Enqueue frame on buffer, if buffer is full, keep trying
while( CTCI_EnqueueIPFrame( pDEVBLK, szBuff, iLength ) < 0
&& pCTCBLK->fd != -1 && !pCTCBLK->fCloseInProgress )
{
if( EMSGSIZE == errno ) // (if too large for buffer)
{
if( pCTCBLK->fDebug )
logmsg( _("HHCCT072W %4.4X: Packet too big; dropped.\n"),
pDEVBLK->devnum );
break; // (discard it...)
}
ASSERT( ENOBUFS == errno );
// Don't use sched_yield() here; use an actual non-dispatchable
// delay instead so as to allow another [possibly lower priority]
// thread to 'read' (remove) some packet(s) from our frame buffer.
usleep( CTC_DELAY_USECS ); // (wait a bit before retrying...)
}
}
// We must do the close since we were the one doing the i/o...
VERIFY( pCTCBLK->fd == -1 || TUNTAP_Close( pCTCBLK->fd ) == 0 );
pCTCBLK->fd = -1;
return NULL;
}
// --------------------------------------------------------------------
// CTCI_EnqueueIPFrame
// --------------------------------------------------------------------
//
// Places the provided IP frame in the next available frame
// slot in the adapter buffer.
//
// Returns: