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[pxe] Remove pxe_set_cached_filename()

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gPXE currently overwrites the filename stored in the cached DHCP
packets when a call to PXENV_TFTP_READ_FILE or PXENV_RESTART_TFTP is
made.  This code has existed for many years as a workaround for RIS,
which seemed to require that this be done.

pxe_set_cached_filename() causes problems with the Bootix NBP, and a
recent test demonstrates that RIS will complete successfully even with
pxe_set_cached_filename() removed.  There have been many changes to
the DHCP and PXE logic since this code was first added, and it is
quite plausible that it was masking a bug that no longer exists.

Reported-by: Alex Zeffertt <alex.zeffertt@eu.citrix.com>
Debugged-by: Shao Miller <Shao.Miller@yrdsb.edu.on.ca>
Signed-off-by: Michael Brown <mcb30@etherboot.org>
This commit is contained in:
Michael Brown 2010-03-26 17:53:24 +00:00
parent 9acf442c20
commit 80d1ac7320
3 changed files with 0 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/arch/i386/include/pxe.h
View File

@ -149,6 +149,4 @@ extern struct net_device *pxe_netdev;
extern void pxe_set_netdev ( struct net_device *netdev );
extern void pxe_set_cached_filename ( const unsigned char *filename );
#endif /* PXE_H */

21
src/arch/i386/interface/pxe/pxe_preboot.c
View File

@ -102,24 +102,6 @@ static struct pxe_dhcp_packet_creator pxe_dhcp_packet_creators[] = {
static union pxe_cached_info __bss16_array ( cached_info, [NUM_CACHED_INFOS] );
#define cached_info __use_data16 ( cached_info )
/**
* Set PXE cached TFTP filename
*
* @v filename TFTP filename
*
* This is a bug-for-bug compatibility hack needed in order to work
* with Microsoft Remote Installation Services (RIS). The filename
* used in a call to PXENV_RESTART_TFTP or PXENV_TFTP_READ_FILE must
* be returned as the DHCP filename in subsequent calls to
* PXENV_GET_CACHED_INFO.
*/
void pxe_set_cached_filename ( const unsigned char *filename ) {
memcpy ( cached_info[CACHED_INFO_DHCPACK].dhcphdr.file, filename,
sizeof ( cached_info[CACHED_INFO_DHCPACK].dhcphdr.file ) );
memcpy ( cached_info[CACHED_INFO_BINL].dhcphdr.file, filename,
sizeof ( cached_info[CACHED_INFO_BINL].dhcphdr.file ) );
}
/**
* UNLOAD BASE CODE STACK
*
@ -236,9 +218,6 @@ PXENV_EXIT_t pxenv_restart_tftp ( struct s_PXENV_TFTP_READ_FILE
DBG ( "PXENV_RESTART_TFTP " );
/* Intel bug-for-bug hack */
pxe_set_cached_filename ( restart_tftp->FileName );
/* Words cannot describe the complete mismatch between the PXE
* specification and any possible version of reality...
*/

14
src/arch/i386/interface/pxe/pxe_tftp.c
View File

@ -171,9 +171,6 @@ static int pxe_tftp_open ( uint32_t ipaddress, unsigned int port,
struct in_addr address;
int rc;
/* Intel bug-for-bug hack */
pxe_set_cached_filename ( filename );
/* Reset PXE TFTP connection structure */
memset ( &pxe_tftp, 0, sizeof ( pxe_tftp ) );
xfer_init ( &pxe_tftp.xfer, &pxe_tftp_xfer_ops, NULL );
@ -470,17 +467,6 @@ PXENV_EXIT_t pxenv_tftp_read ( struct s_PXENV_TFTP_READ *tftp_read ) {
* value before calling this function in protected mode. You cannot
* call this function with a 32-bit stack segment. (See the relevant
* @ref pxe_x86_pmode16 "implementation note" for more details.)
*
* @note Microsoft's NTLDR assumes that the filename passed in via
* s_PXENV_TFTP_READ_FILE::FileName will be stored in the "file" field
* of the stored DHCPACK packet, whence it will be returned via any
* subsequent calls to pxenv_get_cached_info(). Though this is
* essentially a bug in the Intel PXE implementation (not, for once,
* in the specification!), it is a bug that Microsoft relies upon, and
* so we implement this bug-for-bug compatibility by overwriting the
* filename stored DHCPACK packet with the filename passed in
* s_PXENV_TFTP_READ_FILE::FileName.
*
*/
PXENV_EXIT_t pxenv_tftp_read_file ( struct s_PXENV_TFTP_READ_FILE
*tftp_read_file ) {