--- /dev/null
+/*
+ * Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <ipxe/settings.h>
+#include <ipxe/netdevice.h>
+#include <ipxe/dhcppkt.h>
+#include <ipxe/fakedhcp.h>
+
+/** @file
+ *
+ * Fake DHCP packets
+ *
+ */
+
+/**
+ * Copy settings to DHCP packet
+ *
+ * @v dest Destination DHCP packet
+ * @v source Source settings block
+ * @v encapsulator Encapsulating setting tag number, or zero
+ * @ret rc Return status code
+ */
+static int copy_encap_settings ( struct dhcp_packet *dest,
+ struct settings *source,
+ unsigned int encapsulator ) {
+ struct setting setting = { .name = "" };
+ unsigned int subtag;
+ unsigned int tag;
+ void *data;
+ int len;
+ int rc;
+
+ for ( subtag = DHCP_MIN_OPTION; subtag <= DHCP_MAX_OPTION; subtag++ ) {
+ tag = DHCP_ENCAP_OPT ( encapsulator, subtag );
+ switch ( tag ) {
+ case DHCP_EB_ENCAP:
+ case DHCP_VENDOR_ENCAP:
+ /* Process encapsulated settings */
+ if ( ( rc = copy_encap_settings ( dest, source,
+ tag ) ) != 0 )
+ return rc;
+ break;
+ default:
+ /* Copy setting, if present */
+ setting.tag = tag;
+ len = fetch_raw_setting_copy ( source, &setting, &data);
+ if ( len >= 0 ) {
+ rc = dhcppkt_store ( dest, tag, data, len );
+ free ( data );
+ if ( rc != 0 )
+ return rc;
+ }
+ break;
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * Copy settings to DHCP packet
+ *
+ * @v dest Destination DHCP packet
+ * @v source Source settings block
+ * @ret rc Return status code
+ */
+static int copy_settings ( struct dhcp_packet *dest,
+ struct settings *source ) {
+ return copy_encap_settings ( dest, source, 0 );
+}
+
+/**
+ * Create fake DHCPDISCOVER packet
+ *
+ * @v netdev Network device
+ * @v data Buffer for DHCP packet
+ * @v max_len Size of DHCP packet buffer
+ * @ret rc Return status code
+ *
+ * Used by external code.
+ */
+int create_fakedhcpdiscover ( struct net_device *netdev,
+ void *data, size_t max_len ) {
+ struct dhcp_packet dhcppkt;
+ struct in_addr ciaddr = { 0 };
+ int rc;
+
+ if ( ( rc = dhcp_create_request ( &dhcppkt, netdev, DHCPDISCOVER,
+ dhcp_last_xid, ciaddr, data,
+ max_len ) ) != 0 ) {
+ DBG ( "Could not create DHCPDISCOVER: %s\n",
+ strerror ( rc ) );
+ return rc;
+ }
+
+ return 0;
+}
+
+/**
+ * Create fake DHCPACK packet
+ *
+ * @v netdev Network device
+ * @v data Buffer for DHCP packet
+ * @v max_len Size of DHCP packet buffer
+ * @ret rc Return status code
+ *
+ * Used by external code.
+ */
+int create_fakedhcpack ( struct net_device *netdev,
+ void *data, size_t max_len ) {
+ struct dhcp_packet dhcppkt;
+ int rc;
+
+ /* Create base DHCPACK packet */
+ if ( ( rc = dhcp_create_packet ( &dhcppkt, netdev, DHCPACK,
+ dhcp_last_xid, NULL, 0,
+ data, max_len ) ) != 0 ) {
+ DBG ( "Could not create DHCPACK: %s\n", strerror ( rc ) );
+ return rc;
+ }
+
+ /* Merge in globally-scoped settings, then netdev-specific
+ * settings. Do it in this order so that netdev-specific
+ * settings take precedence regardless of stated priorities.
+ */
+ if ( ( rc = copy_settings ( &dhcppkt, NULL ) ) != 0 ) {
+ DBG ( "Could not set DHCPACK global settings: %s\n",
+ strerror ( rc ) );
+ return rc;
+ }
+ if ( ( rc = copy_settings ( &dhcppkt,
+ netdev_settings ( netdev ) ) ) != 0 ) {
+ DBG ( "Could not set DHCPACK netdev settings: %s\n",
+ strerror ( rc ) );
+ return rc;
+ }
+
+ return 0;
+}
+
+/**
+ * Create fake PXE Boot Server ACK packet
+ *
+ * @v netdev Network device
+ * @v data Buffer for DHCP packet
+ * @v max_len Size of DHCP packet buffer
+ * @ret rc Return status code
+ *
+ * Used by external code.
+ */
+int create_fakepxebsack ( struct net_device *netdev,
+ void *data, size_t max_len ) {
+ struct dhcp_packet dhcppkt;
+ struct settings *proxy_settings;
+ struct settings *pxebs_settings;
+ int rc;
+
+ /* Identify available settings */
+ proxy_settings = find_settings ( PROXYDHCP_SETTINGS_NAME );
+ pxebs_settings = find_settings ( PXEBS_SETTINGS_NAME );
+ if ( ( ! proxy_settings ) && ( ! pxebs_settings ) ) {
+ /* No PXE boot server; return the regular DHCPACK */
+ return create_fakedhcpack ( netdev, data, max_len );
+ }
+
+ /* Create base DHCPACK packet */
+ if ( ( rc = dhcp_create_packet ( &dhcppkt, netdev, DHCPACK,
+ dhcp_last_xid, NULL, 0,
+ data, max_len ) ) != 0 ) {
+ DBG ( "Could not create PXE BS ACK: %s\n",
+ strerror ( rc ) );
+ return rc;
+ }
+
+ /* Merge in ProxyDHCP options */
+ if ( proxy_settings &&
+ ( ( rc = copy_settings ( &dhcppkt, proxy_settings ) ) != 0 ) ) {
+ DBG ( "Could not copy ProxyDHCP settings: %s\n",
+ strerror ( rc ) );
+ return rc;
+ }
+
+ /* Merge in BootServerDHCP options, if present */
+ if ( pxebs_settings &&
+ ( ( rc = copy_settings ( &dhcppkt, pxebs_settings ) ) != 0 ) ) {
+ DBG ( "Could not copy PXE BS settings: %s\n",
+ strerror ( rc ) );
+ return rc;
+ }
+
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff