| /* |
| * 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 ); |
| } |