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