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-rw-r--r--gpxe/src/arch/i386/interface/pxeparent/pxeparent_dhcp.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/gpxe/src/arch/i386/interface/pxeparent/pxeparent_dhcp.c b/gpxe/src/arch/i386/interface/pxeparent/pxeparent_dhcp.c
new file mode 100644
index 00000000..66059437
--- /dev/null
+++ b/gpxe/src/arch/i386/interface/pxeparent/pxeparent_dhcp.c
@@ -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 );
+}