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[pxe] Always retrieve cached DHCPACK and apply to relevant network device

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When chainloading, always retrieve the cached DHCPACK packet from the
underlying PXE stack, and apply it as the original contents of the
"net<X>.dhcp" settings block.  This allows cached DHCP settings to be
used for any chainloaded iPXE binary (not just undionly.kkpxe).

This change eliminates the undocumented "use-cached" setting.  Issuing
the "dhcp" command will now always result in a fresh DHCP request.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2013-10-25 17:24:09 +01:00
parent 1aa67eba16
commit 10d19bd2ac
7 changed files with 239 additions and 198 deletions
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70
src/arch/i386/interface/pxeparent/pxeparent_dhcp.c
View File

@@ -1,70 +0,0 @@
/*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <string.h>
#include <ipxe/dhcp.h>
#include <ipxe/netdevice.h>
#include <undipreload.h>
#include <pxeparent.h>
#include <realmode.h>
#include <pxe_api.h>
/**
* Present cached DHCP packet if it exists
*/
void 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 );
}