1/*
2 * Copyright (C) 2009 Joshua Oreman <oremanj@rwcr.net>.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18
19FILE_LICENCE ( GPL2_OR_LATER );
20
21#include <stdio.h>
22#include <stdlib.h>
23#include <string.h>
24#include <gpxe/dhcp.h>
25#include <gpxe/dhcppkt.h>
26#include <gpxe/netdevice.h>
27#include <gpxe/iobuf.h>
28#include <gpxe/uaccess.h>
29
30/** @file
31 *
32 * Cached DHCP packet handling
33 *
34 */
35
36/**
37 * Store cached DHCPACK packet
38 *
39 * @v data		User pointer to cached DHCP packet data
40 * @v len		Length of cached DHCP packet data
41 * @ret rc		Return status code
42 *
43 * This function should be called by the architecture-specific
44 * get_cached_dhcpack() handler.
45 */
46void store_cached_dhcpack ( userptr_t data, size_t len ) {
47	struct dhcp_packet *dhcppkt;
48	struct dhcphdr *dhcphdr;
49	struct settings *parent;
50	int rc;
51
52	/* Create DHCP packet */
53	dhcppkt = zalloc ( sizeof ( *dhcppkt ) + len );
54	if ( ! dhcppkt )
55		return;
56
57	/* Fill in data for DHCP packet */
58	dhcphdr = ( ( ( void * ) dhcppkt ) + sizeof ( * dhcppkt ) );
59	copy_from_user ( dhcphdr, data, 0, len );
60	dhcppkt_init ( dhcppkt, dhcphdr, len );
61	DBG_HD ( dhcppkt->options.data, dhcppkt->options.len );
62
63	/* Register settings on the last opened network device.
64	 * This will have the effect of registering cached settings
65	 * with a network device when "dhcp netX" is performed for that
66	 * device, which is usually what we want.
67	 */
68	parent = netdev_settings ( last_opened_netdev() );
69	if ( ( rc = register_settings ( &dhcppkt->settings, parent ) ) != 0 )
70		DBG ( "DHCP could not register cached settings: %s\n",
71		      strerror ( rc ) );
72
73	dhcppkt_put ( dhcppkt );
74
75	DBG ( "DHCP registered cached settings\n" );
76}
77