david/ipxe
david/ipxe
Archived
1
0
Fork 0
Code

[pxe] Support cached DHCP packets in .kkpxe images

Browse Source 
If we don't unload the PXE stack before executing gPXE, automatically
take advantage of the cached DHCPACK that the underlying/parent PXE
stack can provide. If that cached DHCPACK contains option 175.178, or
the user sets the use-cached setting before invoking DHCP, the real
DHCP request will be skipped and the cached DHCPACK will be used for
network configuration. Otherwise, the cached settings block is thrown
away as soon as a fresh one is acquired.

Signed-off-by: Marty Connor <mdc@etherboot.org>
This commit is contained in:
Joshua Oreman 2009-12-08 03:48:15 -05:00 committed by Marty Connor
parent b1ba80f8fb
commit 9e9cc8c60f
2 changed files with 72 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

69
src/arch/i386/interface/pxeparent/pxeparent_dhcp.c Normal file
View File

@ -0,0 +1,69 @@
/*
* Copyright (C) 2009 Joshua Oreman <oremanj@rwcr.net>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <string.h>
#include <gpxe/dhcp.h>
#include <gpxe/netdevice.h>
#include <undipreload.h>
#include <pxeparent.h>
#include <realmode.h>
#include <pxe_api.h>
/**
* Present cached DHCP packet if it exists
*/
void __weak_impl ( get_cached_dhcpack ) ( void ) {
struct undi_device *undi;
struct s_PXENV_GET_CACHED_INFO get_cached_info;
int rc;
/* Use preloaded UNDI device to get at PXE entry point */
undi = &preloaded_undi;
if ( ! undi->entry.segment ) {
DBG ( "PXEDHCP no preloaded UNDI device found\n" );
return;
}
/* Check that stack is available to get cached info */
if ( ! ( undi->flags & UNDI_FL_KEEP_ALL ) ) {
DBG ( "PXEDHCP stack was unloaded, no cache available\n" );
return;
}
/* Obtain cached DHCP packet */
memset ( &get_cached_info, 0, sizeof ( get_cached_info ) );
get_cached_info.PacketType = PXENV_PACKET_TYPE_DHCP_ACK;
if ( ( rc = pxeparent_call ( undi->entry, PXENV_GET_CACHED_INFO,
&get_cached_info,
sizeof ( get_cached_info ) ) ) != 0 ) {
DBG ( "PXEDHCP GET_CACHED_INFO failed: %s\n", strerror ( rc ) );
return;
}
DBG ( "PXEDHCP got cached info at %04x:%04x length %d\n",
get_cached_info.Buffer.segment, get_cached_info.Buffer.offset,
get_cached_info.BufferSize );
/* Present cached DHCP packet */
store_cached_dhcpack ( real_to_user ( get_cached_info.Buffer.segment,
get_cached_info.Buffer.offset ),
get_cached_info.BufferSize );
}

3
src/arch/i386/prefix/kkpxeprefix.S
View File

@ -5,6 +5,9 @@
FILE_LICENCE ( GPL2_OR_LATER )
/* Since we have the whole stack, we can use cached DHCP information */
REQUEST_OBJECT ( pxeparent_dhcp )
#define PXELOADER_KEEP_UNDI
#define PXELOADER_KEEP_PXE
#include "pxeprefix.S"