2 * Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
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.
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.
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., 51 Franklin Street, Fifth Floor, Boston, MA
19 * You can also choose to distribute this program under the terms of
20 * the Unmodified Binary Distribution Licence (as given in the file
21 * COPYING.UBDL), provided that you have satisfied its requirements.
24 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
31 #include <ipxe/settings.h>
32 #include <ipxe/netdevice.h>
33 #include <ipxe/dhcppkt.h>
34 #include <ipxe/fakedhcp.h>
43 * Copy settings to DHCP packet
45 * @v dest Destination DHCP packet
46 * @v source Source settings block
47 * @v encapsulator Encapsulating setting tag number, or zero
48 * @ret rc Return status code
50 static int copy_encap_settings ( struct dhcp_packet *dest,
51 struct settings *source,
52 unsigned int encapsulator ) {
53 struct setting setting = { .name = "" };
60 for ( subtag = DHCP_MIN_OPTION; subtag <= DHCP_MAX_OPTION; subtag++ ) {
61 tag = DHCP_ENCAP_OPT ( encapsulator, subtag );
64 case DHCP_VENDOR_ENCAP:
65 /* Process encapsulated settings */
66 if ( ( rc = copy_encap_settings ( dest, source,
71 /* Copy setting, if present */
73 len = fetch_raw_setting_copy ( source, &setting, &data);
75 rc = dhcppkt_store ( dest, tag, data, len );
88 * Copy settings to DHCP packet
90 * @v dest Destination DHCP packet
91 * @v source Source settings block
92 * @ret rc Return status code
94 static int copy_settings ( struct dhcp_packet *dest,
95 struct settings *source ) {
96 return copy_encap_settings ( dest, source, 0 );
100 * Create fake DHCPDISCOVER packet
102 * @v netdev Network device
103 * @v data Buffer for DHCP packet
104 * @v max_len Size of DHCP packet buffer
105 * @ret rc Return status code
107 * Used by external code.
109 int create_fakedhcpdiscover ( struct net_device *netdev,
110 void *data, size_t max_len ) {
111 struct dhcp_packet dhcppkt;
112 struct in_addr ciaddr = { 0 };
115 if ( ( rc = dhcp_create_request ( &dhcppkt, netdev, DHCPDISCOVER,
116 dhcp_last_xid, ciaddr, data,
118 DBG ( "Could not create DHCPDISCOVER: %s\n",
127 * Create fake DHCPACK packet
129 * @v netdev Network device
130 * @v data Buffer for DHCP packet
131 * @v max_len Size of DHCP packet buffer
132 * @ret rc Return status code
134 * Used by external code.
136 int create_fakedhcpack ( struct net_device *netdev,
137 void *data, size_t max_len ) {
138 struct dhcp_packet dhcppkt;
141 /* Create base DHCPACK packet */
142 if ( ( rc = dhcp_create_packet ( &dhcppkt, netdev, DHCPACK,
143 dhcp_last_xid, NULL, 0,
144 data, max_len ) ) != 0 ) {
145 DBG ( "Could not create DHCPACK: %s\n", strerror ( rc ) );
149 /* Merge in globally-scoped settings, then netdev-specific
150 * settings. Do it in this order so that netdev-specific
151 * settings take precedence regardless of stated priorities.
153 if ( ( rc = copy_settings ( &dhcppkt, NULL ) ) != 0 ) {
154 DBG ( "Could not set DHCPACK global settings: %s\n",
158 if ( ( rc = copy_settings ( &dhcppkt,
159 netdev_settings ( netdev ) ) ) != 0 ) {
160 DBG ( "Could not set DHCPACK netdev settings: %s\n",
169 * Create fake PXE Boot Server ACK packet
171 * @v netdev Network device
172 * @v data Buffer for DHCP packet
173 * @v max_len Size of DHCP packet buffer
174 * @ret rc Return status code
176 * Used by external code.
178 int create_fakepxebsack ( struct net_device *netdev,
179 void *data, size_t max_len ) {
180 struct dhcp_packet dhcppkt;
181 struct settings *proxy_settings;
182 struct settings *pxebs_settings;
185 /* Identify available settings */
186 proxy_settings = find_settings ( PROXYDHCP_SETTINGS_NAME );
187 pxebs_settings = find_settings ( PXEBS_SETTINGS_NAME );
188 if ( ( ! proxy_settings ) && ( ! pxebs_settings ) ) {
189 /* No PXE boot server; return the regular DHCPACK */
190 return create_fakedhcpack ( netdev, data, max_len );
193 /* Create base DHCPACK packet */
194 if ( ( rc = dhcp_create_packet ( &dhcppkt, netdev, DHCPACK,
195 dhcp_last_xid, NULL, 0,
196 data, max_len ) ) != 0 ) {
197 DBG ( "Could not create PXE BS ACK: %s\n",
202 /* Merge in ProxyDHCP options */
203 if ( proxy_settings &&
204 ( ( rc = copy_settings ( &dhcppkt, proxy_settings ) ) != 0 ) ) {
205 DBG ( "Could not copy ProxyDHCP settings: %s\n",
210 /* Merge in BootServerDHCP options, if present */
211 if ( pxebs_settings &&
212 ( ( rc = copy_settings ( &dhcppkt, pxebs_settings ) ) != 0 ) ) {
213 DBG ( "Could not copy PXE BS settings: %s\n",